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non-PIC references to __ehdr_start in pie and shared
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
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1/* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
4 Free Software Foundation, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23#include "sysdep.h"
24#include "bfd.h"
25#include "bfdlink.h"
26#include "libbfd.h"
27#include "elf-bfd.h"
28#include "elf-nacl.h"
29#include "elf-vxworks.h"
30#include "bfd_stdint.h"
31#include "objalloc.h"
32#include "hashtab.h"
33#include "dwarf2.h"
34
35/* 386 uses REL relocations instead of RELA. */
36#define USE_REL 1
37
38#include "elf/i386.h"
39
40static reloc_howto_type elf_howto_table[]=
41{
42 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_NONE",
44 TRUE, 0x00000000, 0x00000000, FALSE),
45 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_32",
47 TRUE, 0xffffffff, 0xffffffff, FALSE),
48 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_PC32",
50 TRUE, 0xffffffff, 0xffffffff, TRUE),
51 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_GOT32",
53 TRUE, 0xffffffff, 0xffffffff, FALSE),
54 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_PLT32",
56 TRUE, 0xffffffff, 0xffffffff, TRUE),
57 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_COPY",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_RELATIVE",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTOFF",
71 TRUE, 0xffffffff, 0xffffffff, FALSE),
72 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_386_GOTPC",
74 TRUE, 0xffffffff, 0xffffffff, TRUE),
75
76 /* We have a gap in the reloc numbers here.
77 R_386_standard counts the number up to this point, and
78 R_386_ext_offset is the value to subtract from a reloc type of
79 R_386_16 thru R_386_PC8 to form an index into this table. */
80#define R_386_standard (R_386_GOTPC + 1)
81#define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82
83 /* These relocs are a GNU extension. */
84 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_IE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_LE",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_GD",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_TLS_LDM",
101 TRUE, 0xffffffff, 0xffffffff, FALSE),
102 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_16",
104 TRUE, 0xffff, 0xffff, FALSE),
105 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_PC16",
107 TRUE, 0xffff, 0xffff, TRUE),
108 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_386_8",
110 TRUE, 0xff, 0xff, FALSE),
111 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_386_PC8",
113 TRUE, 0xff, 0xff, TRUE),
114
115#define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
116#define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
117 /* These are common with Solaris TLS implementation. */
118 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
135 TRUE, 0xffffffff, 0xffffffff, FALSE),
136 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
137 bfd_elf_generic_reloc, "R_386_SIZE32",
138 TRUE, 0xffffffff, 0xffffffff, FALSE),
139 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
141 TRUE, 0xffffffff, 0xffffffff, FALSE),
142 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
143 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
144 FALSE, 0, 0, FALSE),
145 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_386_TLS_DESC",
147 TRUE, 0xffffffff, 0xffffffff, FALSE),
148 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_386_IRELATIVE",
150 TRUE, 0xffffffff, 0xffffffff, FALSE),
151
152 /* Another gap. */
153#define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
154#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
155
156/* GNU extension to record C++ vtable hierarchy. */
157 HOWTO (R_386_GNU_VTINHERIT, /* type */
158 0, /* rightshift */
159 2, /* size (0 = byte, 1 = short, 2 = long) */
160 0, /* bitsize */
161 FALSE, /* pc_relative */
162 0, /* bitpos */
163 complain_overflow_dont, /* complain_on_overflow */
164 NULL, /* special_function */
165 "R_386_GNU_VTINHERIT", /* name */
166 FALSE, /* partial_inplace */
167 0, /* src_mask */
168 0, /* dst_mask */
169 FALSE), /* pcrel_offset */
170
171/* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_386_GNU_VTENTRY, /* type */
173 0, /* rightshift */
174 2, /* size (0 = byte, 1 = short, 2 = long) */
175 0, /* bitsize */
176 FALSE, /* pc_relative */
177 0, /* bitpos */
178 complain_overflow_dont, /* complain_on_overflow */
179 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
180 "R_386_GNU_VTENTRY", /* name */
181 FALSE, /* partial_inplace */
182 0, /* src_mask */
183 0, /* dst_mask */
184 FALSE) /* pcrel_offset */
185
186#define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
187
188};
189
190#ifdef DEBUG_GEN_RELOC
191#define TRACE(str) \
192 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
193#else
194#define TRACE(str)
195#endif
196
197static reloc_howto_type *
198elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
199 bfd_reloc_code_real_type code)
200{
201 switch (code)
202 {
203 case BFD_RELOC_NONE:
204 TRACE ("BFD_RELOC_NONE");
205 return &elf_howto_table[R_386_NONE];
206
207 case BFD_RELOC_32:
208 TRACE ("BFD_RELOC_32");
209 return &elf_howto_table[R_386_32];
210
211 case BFD_RELOC_CTOR:
212 TRACE ("BFD_RELOC_CTOR");
213 return &elf_howto_table[R_386_32];
214
215 case BFD_RELOC_32_PCREL:
216 TRACE ("BFD_RELOC_PC32");
217 return &elf_howto_table[R_386_PC32];
218
219 case BFD_RELOC_386_GOT32:
220 TRACE ("BFD_RELOC_386_GOT32");
221 return &elf_howto_table[R_386_GOT32];
222
223 case BFD_RELOC_386_PLT32:
224 TRACE ("BFD_RELOC_386_PLT32");
225 return &elf_howto_table[R_386_PLT32];
226
227 case BFD_RELOC_386_COPY:
228 TRACE ("BFD_RELOC_386_COPY");
229 return &elf_howto_table[R_386_COPY];
230
231 case BFD_RELOC_386_GLOB_DAT:
232 TRACE ("BFD_RELOC_386_GLOB_DAT");
233 return &elf_howto_table[R_386_GLOB_DAT];
234
235 case BFD_RELOC_386_JUMP_SLOT:
236 TRACE ("BFD_RELOC_386_JUMP_SLOT");
237 return &elf_howto_table[R_386_JUMP_SLOT];
238
239 case BFD_RELOC_386_RELATIVE:
240 TRACE ("BFD_RELOC_386_RELATIVE");
241 return &elf_howto_table[R_386_RELATIVE];
242
243 case BFD_RELOC_386_GOTOFF:
244 TRACE ("BFD_RELOC_386_GOTOFF");
245 return &elf_howto_table[R_386_GOTOFF];
246
247 case BFD_RELOC_386_GOTPC:
248 TRACE ("BFD_RELOC_386_GOTPC");
249 return &elf_howto_table[R_386_GOTPC];
250
251 /* These relocs are a GNU extension. */
252 case BFD_RELOC_386_TLS_TPOFF:
253 TRACE ("BFD_RELOC_386_TLS_TPOFF");
254 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_IE:
257 TRACE ("BFD_RELOC_386_TLS_IE");
258 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_GOTIE:
261 TRACE ("BFD_RELOC_386_TLS_GOTIE");
262 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_LE:
265 TRACE ("BFD_RELOC_386_TLS_LE");
266 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
267
268 case BFD_RELOC_386_TLS_GD:
269 TRACE ("BFD_RELOC_386_TLS_GD");
270 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
271
272 case BFD_RELOC_386_TLS_LDM:
273 TRACE ("BFD_RELOC_386_TLS_LDM");
274 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
275
276 case BFD_RELOC_16:
277 TRACE ("BFD_RELOC_16");
278 return &elf_howto_table[R_386_16 - R_386_ext_offset];
279
280 case BFD_RELOC_16_PCREL:
281 TRACE ("BFD_RELOC_16_PCREL");
282 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
283
284 case BFD_RELOC_8:
285 TRACE ("BFD_RELOC_8");
286 return &elf_howto_table[R_386_8 - R_386_ext_offset];
287
288 case BFD_RELOC_8_PCREL:
289 TRACE ("BFD_RELOC_8_PCREL");
290 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
291
292 /* Common with Sun TLS implementation. */
293 case BFD_RELOC_386_TLS_LDO_32:
294 TRACE ("BFD_RELOC_386_TLS_LDO_32");
295 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_IE_32:
298 TRACE ("BFD_RELOC_386_TLS_IE_32");
299 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_LE_32:
302 TRACE ("BFD_RELOC_386_TLS_LE_32");
303 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_DTPMOD32:
306 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
307 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
308
309 case BFD_RELOC_386_TLS_DTPOFF32:
310 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
311 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_TPOFF32:
314 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
315 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
316
317 case BFD_RELOC_SIZE32:
318 TRACE ("BFD_RELOC_SIZE32");
319 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_GOTDESC:
322 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
323 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_TLS_DESC_CALL:
326 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
327 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
328
329 case BFD_RELOC_386_TLS_DESC:
330 TRACE ("BFD_RELOC_386_TLS_DESC");
331 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
332
333 case BFD_RELOC_386_IRELATIVE:
334 TRACE ("BFD_RELOC_386_IRELATIVE");
335 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
336
337 case BFD_RELOC_VTABLE_INHERIT:
338 TRACE ("BFD_RELOC_VTABLE_INHERIT");
339 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
340
341 case BFD_RELOC_VTABLE_ENTRY:
342 TRACE ("BFD_RELOC_VTABLE_ENTRY");
343 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
344
345 default:
346 break;
347 }
348
349 TRACE ("Unknown");
350 return 0;
351}
352
353static reloc_howto_type *
354elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
355 const char *r_name)
356{
357 unsigned int i;
358
359 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
360 if (elf_howto_table[i].name != NULL
361 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
362 return &elf_howto_table[i];
363
364 return NULL;
365}
366
367static reloc_howto_type *
368elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
369{
370 unsigned int indx;
371
372 if ((indx = r_type) >= R_386_standard
373 && ((indx = r_type - R_386_ext_offset) - R_386_standard
374 >= R_386_ext - R_386_standard)
375 && ((indx = r_type - R_386_tls_offset) - R_386_ext
376 >= R_386_irelative - R_386_ext)
377 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
378 >= R_386_vt - R_386_irelative))
379 {
380 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
381 abfd, (int) r_type);
382 indx = R_386_NONE;
383 }
384 BFD_ASSERT (elf_howto_table [indx].type == r_type);
385 return &elf_howto_table[indx];
386}
387
388static void
389elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392{
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395}
396
397/* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403static bfd_boolean
404elf_i386_is_local_label_name (bfd *abfd, const char *name)
405{
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410}
411\f
412/* Support for core dump NOTE sections. */
413
414static bfd_boolean
415elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416{
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462}
463
464static bfd_boolean
465elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466{
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
474 elf_tdata (abfd)->core->program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core->command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core->pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core->program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core->command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
493 }
494 }
495
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
499 {
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508}
509\f
510/* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
522
523
524/* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
529/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
532 shared lib. */
533#define ELIMINATE_COPY_RELOCS 1
534
535/* The size in bytes of an entry in the procedure linkage table. */
536
537#define PLT_ENTRY_SIZE 16
538
539/* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
542
543static const bfd_byte elf_i386_plt0_entry[12] =
544{
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
549};
550
551/* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555{
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
562};
563
564/* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
566
567static const bfd_byte elf_i386_pic_plt0_entry[12] =
568{
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571};
572
573/* Subsequent entries in a PIC procedure linkage table look like this. */
574
575static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576{
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
583};
584
585/* .eh_frame covering the .plt section. */
586
587static const bfd_byte elf_i386_eh_frame_plt[] =
588{
589#define PLT_CIE_LENGTH 20
590#define PLT_FDE_LENGTH 36
591#define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
592#define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
593 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
594 0, 0, 0, 0, /* CIE ID */
595 1, /* CIE version */
596 'z', 'R', 0, /* Augmentation string */
597 1, /* Code alignment factor */
598 0x7c, /* Data alignment factor */
599 8, /* Return address column */
600 1, /* Augmentation size */
601 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
602 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
603 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
604 DW_CFA_nop, DW_CFA_nop,
605
606 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
607 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
608 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
609 0, 0, 0, 0, /* .plt size goes here */
610 0, /* Augmentation size */
611 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
612 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
613 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
614 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
615 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
616 11, /* Block length */
617 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
618 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
619 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
620 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
621 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
622};
623
624struct elf_i386_plt_layout
625{
626 /* The first entry in an absolute procedure linkage table looks like this. */
627 const bfd_byte *plt0_entry;
628 unsigned int plt0_entry_size;
629
630 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
631 unsigned int plt0_got1_offset;
632 unsigned int plt0_got2_offset;
633
634 /* Later entries in an absolute procedure linkage table look like this. */
635 const bfd_byte *plt_entry;
636 unsigned int plt_entry_size;
637
638 /* Offsets into plt_entry that are to be replaced with... */
639 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
640 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
641 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
642
643 /* Offset into plt_entry where the initial value of the GOT entry points. */
644 unsigned int plt_lazy_offset;
645
646 /* The first entry in a PIC procedure linkage table looks like this. */
647 const bfd_byte *pic_plt0_entry;
648
649 /* Subsequent entries in a PIC procedure linkage table look like this. */
650 const bfd_byte *pic_plt_entry;
651
652 /* .eh_frame covering the .plt section. */
653 const bfd_byte *eh_frame_plt;
654 unsigned int eh_frame_plt_size;
655};
656
657#define GET_PLT_ENTRY_SIZE(abfd) \
658 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
659
660/* These are the standard parameters. */
661static const struct elf_i386_plt_layout elf_i386_plt =
662 {
663 elf_i386_plt0_entry, /* plt0_entry */
664 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
665 2, /* plt0_got1_offset */
666 8, /* plt0_got2_offset */
667 elf_i386_plt_entry, /* plt_entry */
668 PLT_ENTRY_SIZE, /* plt_entry_size */
669 2, /* plt_got_offset */
670 7, /* plt_reloc_offset */
671 12, /* plt_plt_offset */
672 6, /* plt_lazy_offset */
673 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
674 elf_i386_pic_plt_entry, /* pic_plt_entry */
675 elf_i386_eh_frame_plt, /* eh_frame_plt */
676 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
677 };
678\f
679
680/* On VxWorks, the .rel.plt.unloaded section has absolute relocations
681 for the PLTResolve stub and then for each PLT entry. */
682#define PLTRESOLVE_RELOCS_SHLIB 0
683#define PLTRESOLVE_RELOCS 2
684#define PLT_NON_JUMP_SLOT_RELOCS 2
685
686/* Architecture-specific backend data for i386. */
687
688struct elf_i386_backend_data
689{
690 /* Parameters describing PLT generation. */
691 const struct elf_i386_plt_layout *plt;
692
693 /* Value used to fill the unused bytes of the first PLT entry. */
694 bfd_byte plt0_pad_byte;
695
696 /* True if the target system is VxWorks. */
697 int is_vxworks;
698};
699
700#define get_elf_i386_backend_data(abfd) \
701 ((const struct elf_i386_backend_data *) \
702 get_elf_backend_data (abfd)->arch_data)
703
704/* These are the standard parameters. */
705static const struct elf_i386_backend_data elf_i386_arch_bed =
706 {
707 &elf_i386_plt, /* plt */
708 0, /* plt0_pad_byte */
709 0, /* is_vxworks */
710 };
711
712#define elf_backend_arch_data &elf_i386_arch_bed
713
714/* i386 ELF linker hash entry. */
715
716struct elf_i386_link_hash_entry
717{
718 struct elf_link_hash_entry elf;
719
720 /* Track dynamic relocs copied for this symbol. */
721 struct elf_dyn_relocs *dyn_relocs;
722
723#define GOT_UNKNOWN 0
724#define GOT_NORMAL 1
725#define GOT_TLS_GD 2
726#define GOT_TLS_IE 4
727#define GOT_TLS_IE_POS 5
728#define GOT_TLS_IE_NEG 6
729#define GOT_TLS_IE_BOTH 7
730#define GOT_TLS_GDESC 8
731#define GOT_TLS_GD_BOTH_P(type) \
732 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
733#define GOT_TLS_GD_P(type) \
734 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
735#define GOT_TLS_GDESC_P(type) \
736 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
737#define GOT_TLS_GD_ANY_P(type) \
738 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
739 unsigned char tls_type;
740
741 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
742 starting at the end of the jump table. */
743 bfd_vma tlsdesc_got;
744};
745
746#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
747
748struct elf_i386_obj_tdata
749{
750 struct elf_obj_tdata root;
751
752 /* tls_type for each local got entry. */
753 char *local_got_tls_type;
754
755 /* GOTPLT entries for TLS descriptors. */
756 bfd_vma *local_tlsdesc_gotent;
757};
758
759#define elf_i386_tdata(abfd) \
760 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
761
762#define elf_i386_local_got_tls_type(abfd) \
763 (elf_i386_tdata (abfd)->local_got_tls_type)
764
765#define elf_i386_local_tlsdesc_gotent(abfd) \
766 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
767
768#define is_i386_elf(bfd) \
769 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
770 && elf_tdata (bfd) != NULL \
771 && elf_object_id (bfd) == I386_ELF_DATA)
772
773static bfd_boolean
774elf_i386_mkobject (bfd *abfd)
775{
776 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
777 I386_ELF_DATA);
778}
779
780/* i386 ELF linker hash table. */
781
782struct elf_i386_link_hash_table
783{
784 struct elf_link_hash_table elf;
785
786 /* Short-cuts to get to dynamic linker sections. */
787 asection *sdynbss;
788 asection *srelbss;
789 asection *plt_eh_frame;
790
791 union
792 {
793 bfd_signed_vma refcount;
794 bfd_vma offset;
795 } tls_ldm_got;
796
797 /* The amount of space used by the reserved portion of the sgotplt
798 section, plus whatever space is used by the jump slots. */
799 bfd_vma sgotplt_jump_table_size;
800
801 /* Small local sym cache. */
802 struct sym_cache sym_cache;
803
804 /* _TLS_MODULE_BASE_ symbol. */
805 struct bfd_link_hash_entry *tls_module_base;
806
807 /* Used by local STT_GNU_IFUNC symbols. */
808 htab_t loc_hash_table;
809 void * loc_hash_memory;
810
811 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
812 asection *srelplt2;
813
814 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
815 bfd_vma next_tls_desc_index;
816
817 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
818 bfd_vma next_jump_slot_index;
819
820 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
821 bfd_vma next_irelative_index;
822};
823
824/* Get the i386 ELF linker hash table from a link_info structure. */
825
826#define elf_i386_hash_table(p) \
827 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
828 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
829
830#define elf_i386_compute_jump_table_size(htab) \
831 ((htab)->next_tls_desc_index * 4)
832
833/* Create an entry in an i386 ELF linker hash table. */
834
835static struct bfd_hash_entry *
836elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
837 struct bfd_hash_table *table,
838 const char *string)
839{
840 /* Allocate the structure if it has not already been allocated by a
841 subclass. */
842 if (entry == NULL)
843 {
844 entry = (struct bfd_hash_entry *)
845 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
846 if (entry == NULL)
847 return entry;
848 }
849
850 /* Call the allocation method of the superclass. */
851 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
852 if (entry != NULL)
853 {
854 struct elf_i386_link_hash_entry *eh;
855
856 eh = (struct elf_i386_link_hash_entry *) entry;
857 eh->dyn_relocs = NULL;
858 eh->tls_type = GOT_UNKNOWN;
859 eh->tlsdesc_got = (bfd_vma) -1;
860 }
861
862 return entry;
863}
864
865/* Compute a hash of a local hash entry. We use elf_link_hash_entry
866 for local symbol so that we can handle local STT_GNU_IFUNC symbols
867 as global symbol. We reuse indx and dynstr_index for local symbol
868 hash since they aren't used by global symbols in this backend. */
869
870static hashval_t
871elf_i386_local_htab_hash (const void *ptr)
872{
873 struct elf_link_hash_entry *h
874 = (struct elf_link_hash_entry *) ptr;
875 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
876}
877
878/* Compare local hash entries. */
879
880static int
881elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
882{
883 struct elf_link_hash_entry *h1
884 = (struct elf_link_hash_entry *) ptr1;
885 struct elf_link_hash_entry *h2
886 = (struct elf_link_hash_entry *) ptr2;
887
888 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
889}
890
891/* Find and/or create a hash entry for local symbol. */
892
893static struct elf_link_hash_entry *
894elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
895 bfd *abfd, const Elf_Internal_Rela *rel,
896 bfd_boolean create)
897{
898 struct elf_i386_link_hash_entry e, *ret;
899 asection *sec = abfd->sections;
900 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
901 ELF32_R_SYM (rel->r_info));
902 void **slot;
903
904 e.elf.indx = sec->id;
905 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
906 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
907 create ? INSERT : NO_INSERT);
908
909 if (!slot)
910 return NULL;
911
912 if (*slot)
913 {
914 ret = (struct elf_i386_link_hash_entry *) *slot;
915 return &ret->elf;
916 }
917
918 ret = (struct elf_i386_link_hash_entry *)
919 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
920 sizeof (struct elf_i386_link_hash_entry));
921 if (ret)
922 {
923 memset (ret, 0, sizeof (*ret));
924 ret->elf.indx = sec->id;
925 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
926 ret->elf.dynindx = -1;
927 *slot = ret;
928 }
929 return &ret->elf;
930}
931
932/* Create an i386 ELF linker hash table. */
933
934static struct bfd_link_hash_table *
935elf_i386_link_hash_table_create (bfd *abfd)
936{
937 struct elf_i386_link_hash_table *ret;
938 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
939
940 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
941 if (ret == NULL)
942 return NULL;
943
944 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
945 elf_i386_link_hash_newfunc,
946 sizeof (struct elf_i386_link_hash_entry),
947 I386_ELF_DATA))
948 {
949 free (ret);
950 return NULL;
951 }
952
953 ret->loc_hash_table = htab_try_create (1024,
954 elf_i386_local_htab_hash,
955 elf_i386_local_htab_eq,
956 NULL);
957 ret->loc_hash_memory = objalloc_create ();
958 if (!ret->loc_hash_table || !ret->loc_hash_memory)
959 {
960 free (ret);
961 return NULL;
962 }
963
964 return &ret->elf.root;
965}
966
967/* Destroy an i386 ELF linker hash table. */
968
969static void
970elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
971{
972 struct elf_i386_link_hash_table *htab
973 = (struct elf_i386_link_hash_table *) hash;
974
975 if (htab->loc_hash_table)
976 htab_delete (htab->loc_hash_table);
977 if (htab->loc_hash_memory)
978 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
979 _bfd_elf_link_hash_table_free (hash);
980}
981
982/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
983 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
984 hash table. */
985
986static bfd_boolean
987elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
988{
989 struct elf_i386_link_hash_table *htab;
990
991 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
992 return FALSE;
993
994 htab = elf_i386_hash_table (info);
995 if (htab == NULL)
996 return FALSE;
997
998 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
999 if (!info->shared)
1000 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1001
1002 if (!htab->sdynbss
1003 || (!info->shared && !htab->srelbss))
1004 abort ();
1005
1006 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1007 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1008 &htab->srelplt2))
1009 return FALSE;
1010
1011 if (!info->no_ld_generated_unwind_info
1012 && htab->plt_eh_frame == NULL
1013 && htab->elf.splt != NULL)
1014 {
1015 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1016 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1017 | SEC_LINKER_CREATED);
1018 htab->plt_eh_frame
1019 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1020 if (htab->plt_eh_frame == NULL
1021 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1022 return FALSE;
1023 }
1024
1025 return TRUE;
1026}
1027
1028/* Copy the extra info we tack onto an elf_link_hash_entry. */
1029
1030static void
1031elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1032 struct elf_link_hash_entry *dir,
1033 struct elf_link_hash_entry *ind)
1034{
1035 struct elf_i386_link_hash_entry *edir, *eind;
1036
1037 edir = (struct elf_i386_link_hash_entry *) dir;
1038 eind = (struct elf_i386_link_hash_entry *) ind;
1039
1040 if (eind->dyn_relocs != NULL)
1041 {
1042 if (edir->dyn_relocs != NULL)
1043 {
1044 struct elf_dyn_relocs **pp;
1045 struct elf_dyn_relocs *p;
1046
1047 /* Add reloc counts against the indirect sym to the direct sym
1048 list. Merge any entries against the same section. */
1049 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1050 {
1051 struct elf_dyn_relocs *q;
1052
1053 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1054 if (q->sec == p->sec)
1055 {
1056 q->pc_count += p->pc_count;
1057 q->count += p->count;
1058 *pp = p->next;
1059 break;
1060 }
1061 if (q == NULL)
1062 pp = &p->next;
1063 }
1064 *pp = edir->dyn_relocs;
1065 }
1066
1067 edir->dyn_relocs = eind->dyn_relocs;
1068 eind->dyn_relocs = NULL;
1069 }
1070
1071 if (ind->root.type == bfd_link_hash_indirect
1072 && dir->got.refcount <= 0)
1073 {
1074 edir->tls_type = eind->tls_type;
1075 eind->tls_type = GOT_UNKNOWN;
1076 }
1077
1078 if (ELIMINATE_COPY_RELOCS
1079 && ind->root.type != bfd_link_hash_indirect
1080 && dir->dynamic_adjusted)
1081 {
1082 /* If called to transfer flags for a weakdef during processing
1083 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1084 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1085 dir->ref_dynamic |= ind->ref_dynamic;
1086 dir->ref_regular |= ind->ref_regular;
1087 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1088 dir->needs_plt |= ind->needs_plt;
1089 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1090 }
1091 else
1092 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1093}
1094
1095/* Return TRUE if the TLS access code sequence support transition
1096 from R_TYPE. */
1097
1098static bfd_boolean
1099elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1100 bfd_byte *contents,
1101 Elf_Internal_Shdr *symtab_hdr,
1102 struct elf_link_hash_entry **sym_hashes,
1103 unsigned int r_type,
1104 const Elf_Internal_Rela *rel,
1105 const Elf_Internal_Rela *relend)
1106{
1107 unsigned int val, type;
1108 unsigned long r_symndx;
1109 struct elf_link_hash_entry *h;
1110 bfd_vma offset;
1111
1112 /* Get the section contents. */
1113 if (contents == NULL)
1114 {
1115 if (elf_section_data (sec)->this_hdr.contents != NULL)
1116 contents = elf_section_data (sec)->this_hdr.contents;
1117 else
1118 {
1119 /* FIXME: How to better handle error condition? */
1120 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1121 return FALSE;
1122
1123 /* Cache the section contents for elf_link_input_bfd. */
1124 elf_section_data (sec)->this_hdr.contents = contents;
1125 }
1126 }
1127
1128 offset = rel->r_offset;
1129 switch (r_type)
1130 {
1131 case R_386_TLS_GD:
1132 case R_386_TLS_LDM:
1133 if (offset < 2 || (rel + 1) >= relend)
1134 return FALSE;
1135
1136 type = bfd_get_8 (abfd, contents + offset - 2);
1137 if (r_type == R_386_TLS_GD)
1138 {
1139 /* Check transition from GD access model. Only
1140 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1141 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1142 can transit to different access model. */
1143 if ((offset + 10) > sec->size ||
1144 (type != 0x8d && type != 0x04))
1145 return FALSE;
1146
1147 val = bfd_get_8 (abfd, contents + offset - 1);
1148 if (type == 0x04)
1149 {
1150 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1151 if (offset < 3)
1152 return FALSE;
1153
1154 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1155 return FALSE;
1156
1157 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1158 return FALSE;
1159 }
1160 else
1161 {
1162 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1163 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1164 return FALSE;
1165
1166 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1167 return FALSE;
1168 }
1169 }
1170 else
1171 {
1172 /* Check transition from LD access model. Only
1173 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1174 can transit to different access model. */
1175 if (type != 0x8d || (offset + 9) > sec->size)
1176 return FALSE;
1177
1178 val = bfd_get_8 (abfd, contents + offset - 1);
1179 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1180 return FALSE;
1181 }
1182
1183 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1184 return FALSE;
1185
1186 r_symndx = ELF32_R_SYM (rel[1].r_info);
1187 if (r_symndx < symtab_hdr->sh_info)
1188 return FALSE;
1189
1190 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1191 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1192 may be versioned. */
1193 return (h != NULL
1194 && h->root.root.string != NULL
1195 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1196 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1197 && (strncmp (h->root.root.string, "___tls_get_addr",
1198 15) == 0));
1199
1200 case R_386_TLS_IE:
1201 /* Check transition from IE access model:
1202 movl foo@indntpoff(%rip), %eax
1203 movl foo@indntpoff(%rip), %reg
1204 addl foo@indntpoff(%rip), %reg
1205 */
1206
1207 if (offset < 1 || (offset + 4) > sec->size)
1208 return FALSE;
1209
1210 /* Check "movl foo@tpoff(%rip), %eax" first. */
1211 val = bfd_get_8 (abfd, contents + offset - 1);
1212 if (val == 0xa1)
1213 return TRUE;
1214
1215 if (offset < 2)
1216 return FALSE;
1217
1218 /* Check movl|addl foo@tpoff(%rip), %reg. */
1219 type = bfd_get_8 (abfd, contents + offset - 2);
1220 return ((type == 0x8b || type == 0x03)
1221 && (val & 0xc7) == 0x05);
1222
1223 case R_386_TLS_GOTIE:
1224 case R_386_TLS_IE_32:
1225 /* Check transition from {IE_32,GOTIE} access model:
1226 subl foo@{tpoff,gontoff}(%reg1), %reg2
1227 movl foo@{tpoff,gontoff}(%reg1), %reg2
1228 addl foo@{tpoff,gontoff}(%reg1), %reg2
1229 */
1230
1231 if (offset < 2 || (offset + 4) > sec->size)
1232 return FALSE;
1233
1234 val = bfd_get_8 (abfd, contents + offset - 1);
1235 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1236 return FALSE;
1237
1238 type = bfd_get_8 (abfd, contents + offset - 2);
1239 return type == 0x8b || type == 0x2b || type == 0x03;
1240
1241 case R_386_TLS_GOTDESC:
1242 /* Check transition from GDesc access model:
1243 leal x@tlsdesc(%ebx), %eax
1244
1245 Make sure it's a leal adding ebx to a 32-bit offset
1246 into any register, although it's probably almost always
1247 going to be eax. */
1248
1249 if (offset < 2 || (offset + 4) > sec->size)
1250 return FALSE;
1251
1252 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1253 return FALSE;
1254
1255 val = bfd_get_8 (abfd, contents + offset - 1);
1256 return (val & 0xc7) == 0x83;
1257
1258 case R_386_TLS_DESC_CALL:
1259 /* Check transition from GDesc access model:
1260 call *x@tlsdesc(%rax)
1261 */
1262 if (offset + 2 <= sec->size)
1263 {
1264 /* Make sure that it's a call *x@tlsdesc(%rax). */
1265 static const unsigned char call[] = { 0xff, 0x10 };
1266 return memcmp (contents + offset, call, 2) == 0;
1267 }
1268
1269 return FALSE;
1270
1271 default:
1272 abort ();
1273 }
1274}
1275
1276/* Return TRUE if the TLS access transition is OK or no transition
1277 will be performed. Update R_TYPE if there is a transition. */
1278
1279static bfd_boolean
1280elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1281 asection *sec, bfd_byte *contents,
1282 Elf_Internal_Shdr *symtab_hdr,
1283 struct elf_link_hash_entry **sym_hashes,
1284 unsigned int *r_type, int tls_type,
1285 const Elf_Internal_Rela *rel,
1286 const Elf_Internal_Rela *relend,
1287 struct elf_link_hash_entry *h,
1288 unsigned long r_symndx)
1289{
1290 unsigned int from_type = *r_type;
1291 unsigned int to_type = from_type;
1292 bfd_boolean check = TRUE;
1293
1294 /* Skip TLS transition for functions. */
1295 if (h != NULL
1296 && (h->type == STT_FUNC
1297 || h->type == STT_GNU_IFUNC))
1298 return TRUE;
1299
1300 switch (from_type)
1301 {
1302 case R_386_TLS_GD:
1303 case R_386_TLS_GOTDESC:
1304 case R_386_TLS_DESC_CALL:
1305 case R_386_TLS_IE_32:
1306 case R_386_TLS_IE:
1307 case R_386_TLS_GOTIE:
1308 if (info->executable)
1309 {
1310 if (h == NULL)
1311 to_type = R_386_TLS_LE_32;
1312 else if (from_type != R_386_TLS_IE
1313 && from_type != R_386_TLS_GOTIE)
1314 to_type = R_386_TLS_IE_32;
1315 }
1316
1317 /* When we are called from elf_i386_relocate_section, CONTENTS
1318 isn't NULL and there may be additional transitions based on
1319 TLS_TYPE. */
1320 if (contents != NULL)
1321 {
1322 unsigned int new_to_type = to_type;
1323
1324 if (info->executable
1325 && h != NULL
1326 && h->dynindx == -1
1327 && (tls_type & GOT_TLS_IE))
1328 new_to_type = R_386_TLS_LE_32;
1329
1330 if (to_type == R_386_TLS_GD
1331 || to_type == R_386_TLS_GOTDESC
1332 || to_type == R_386_TLS_DESC_CALL)
1333 {
1334 if (tls_type == GOT_TLS_IE_POS)
1335 new_to_type = R_386_TLS_GOTIE;
1336 else if (tls_type & GOT_TLS_IE)
1337 new_to_type = R_386_TLS_IE_32;
1338 }
1339
1340 /* We checked the transition before when we were called from
1341 elf_i386_check_relocs. We only want to check the new
1342 transition which hasn't been checked before. */
1343 check = new_to_type != to_type && from_type == to_type;
1344 to_type = new_to_type;
1345 }
1346
1347 break;
1348
1349 case R_386_TLS_LDM:
1350 if (info->executable)
1351 to_type = R_386_TLS_LE_32;
1352 break;
1353
1354 default:
1355 return TRUE;
1356 }
1357
1358 /* Return TRUE if there is no transition. */
1359 if (from_type == to_type)
1360 return TRUE;
1361
1362 /* Check if the transition can be performed. */
1363 if (check
1364 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1365 symtab_hdr, sym_hashes,
1366 from_type, rel, relend))
1367 {
1368 reloc_howto_type *from, *to;
1369 const char *name;
1370
1371 from = elf_i386_rtype_to_howto (abfd, from_type);
1372 to = elf_i386_rtype_to_howto (abfd, to_type);
1373
1374 if (h)
1375 name = h->root.root.string;
1376 else
1377 {
1378 struct elf_i386_link_hash_table *htab;
1379
1380 htab = elf_i386_hash_table (info);
1381 if (htab == NULL)
1382 name = "*unknown*";
1383 else
1384 {
1385 Elf_Internal_Sym *isym;
1386
1387 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1388 abfd, r_symndx);
1389 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1390 }
1391 }
1392
1393 (*_bfd_error_handler)
1394 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1395 "in section `%A' failed"),
1396 abfd, sec, from->name, to->name, name,
1397 (unsigned long) rel->r_offset);
1398 bfd_set_error (bfd_error_bad_value);
1399 return FALSE;
1400 }
1401
1402 *r_type = to_type;
1403 return TRUE;
1404}
1405
1406/* Look through the relocs for a section during the first phase, and
1407 calculate needed space in the global offset table, procedure linkage
1408 table, and dynamic reloc sections. */
1409
1410static bfd_boolean
1411elf_i386_check_relocs (bfd *abfd,
1412 struct bfd_link_info *info,
1413 asection *sec,
1414 const Elf_Internal_Rela *relocs)
1415{
1416 struct elf_i386_link_hash_table *htab;
1417 Elf_Internal_Shdr *symtab_hdr;
1418 struct elf_link_hash_entry **sym_hashes;
1419 const Elf_Internal_Rela *rel;
1420 const Elf_Internal_Rela *rel_end;
1421 asection *sreloc;
1422
1423 if (info->relocatable)
1424 return TRUE;
1425
1426 BFD_ASSERT (is_i386_elf (abfd));
1427
1428 htab = elf_i386_hash_table (info);
1429 if (htab == NULL)
1430 return FALSE;
1431
1432 symtab_hdr = &elf_symtab_hdr (abfd);
1433 sym_hashes = elf_sym_hashes (abfd);
1434
1435 sreloc = NULL;
1436
1437 rel_end = relocs + sec->reloc_count;
1438 for (rel = relocs; rel < rel_end; rel++)
1439 {
1440 unsigned int r_type;
1441 unsigned long r_symndx;
1442 struct elf_link_hash_entry *h;
1443 Elf_Internal_Sym *isym;
1444 const char *name;
1445 bfd_boolean size_reloc;
1446
1447 r_symndx = ELF32_R_SYM (rel->r_info);
1448 r_type = ELF32_R_TYPE (rel->r_info);
1449
1450 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1451 {
1452 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1453 abfd,
1454 r_symndx);
1455 return FALSE;
1456 }
1457
1458 if (r_symndx < symtab_hdr->sh_info)
1459 {
1460 /* A local symbol. */
1461 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1462 abfd, r_symndx);
1463 if (isym == NULL)
1464 return FALSE;
1465
1466 /* Check relocation against local STT_GNU_IFUNC symbol. */
1467 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1468 {
1469 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1470 if (h == NULL)
1471 return FALSE;
1472
1473 /* Fake a STT_GNU_IFUNC symbol. */
1474 h->type = STT_GNU_IFUNC;
1475 h->def_regular = 1;
1476 h->ref_regular = 1;
1477 h->forced_local = 1;
1478 h->root.type = bfd_link_hash_defined;
1479 }
1480 else
1481 h = NULL;
1482 }
1483 else
1484 {
1485 isym = NULL;
1486 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1487 while (h->root.type == bfd_link_hash_indirect
1488 || h->root.type == bfd_link_hash_warning)
1489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1490 }
1491
1492 if (h != NULL)
1493 {
1494 /* Create the ifunc sections for static executables. If we
1495 never see an indirect function symbol nor we are building
1496 a static executable, those sections will be empty and
1497 won't appear in output. */
1498 switch (r_type)
1499 {
1500 default:
1501 break;
1502
1503 case R_386_32:
1504 case R_386_PC32:
1505 case R_386_PLT32:
1506 case R_386_GOT32:
1507 case R_386_GOTOFF:
1508 if (htab->elf.dynobj == NULL)
1509 htab->elf.dynobj = abfd;
1510 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1511 return FALSE;
1512 break;
1513 }
1514
1515 /* It is referenced by a non-shared object. */
1516 h->ref_regular = 1;
1517 h->root.non_ir_ref = 1;
1518 }
1519
1520 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1521 symtab_hdr, sym_hashes,
1522 &r_type, GOT_UNKNOWN,
1523 rel, rel_end, h, r_symndx))
1524 return FALSE;
1525
1526 switch (r_type)
1527 {
1528 case R_386_TLS_LDM:
1529 htab->tls_ldm_got.refcount += 1;
1530 goto create_got;
1531
1532 case R_386_PLT32:
1533 /* This symbol requires a procedure linkage table entry. We
1534 actually build the entry in adjust_dynamic_symbol,
1535 because this might be a case of linking PIC code which is
1536 never referenced by a dynamic object, in which case we
1537 don't need to generate a procedure linkage table entry
1538 after all. */
1539
1540 /* If this is a local symbol, we resolve it directly without
1541 creating a procedure linkage table entry. */
1542 if (h == NULL)
1543 continue;
1544
1545 h->needs_plt = 1;
1546 h->plt.refcount += 1;
1547 break;
1548
1549 case R_386_SIZE32:
1550 size_reloc = TRUE;
1551 goto do_size;
1552
1553 case R_386_TLS_IE_32:
1554 case R_386_TLS_IE:
1555 case R_386_TLS_GOTIE:
1556 if (!info->executable)
1557 info->flags |= DF_STATIC_TLS;
1558 /* Fall through */
1559
1560 case R_386_GOT32:
1561 case R_386_TLS_GD:
1562 case R_386_TLS_GOTDESC:
1563 case R_386_TLS_DESC_CALL:
1564 /* This symbol requires a global offset table entry. */
1565 {
1566 int tls_type, old_tls_type;
1567
1568 switch (r_type)
1569 {
1570 default:
1571 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1572 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1573 case R_386_TLS_GOTDESC:
1574 case R_386_TLS_DESC_CALL:
1575 tls_type = GOT_TLS_GDESC; break;
1576 case R_386_TLS_IE_32:
1577 if (ELF32_R_TYPE (rel->r_info) == r_type)
1578 tls_type = GOT_TLS_IE_NEG;
1579 else
1580 /* If this is a GD->IE transition, we may use either of
1581 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1582 tls_type = GOT_TLS_IE;
1583 break;
1584 case R_386_TLS_IE:
1585 case R_386_TLS_GOTIE:
1586 tls_type = GOT_TLS_IE_POS; break;
1587 }
1588
1589 if (h != NULL)
1590 {
1591 h->got.refcount += 1;
1592 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1593 }
1594 else
1595 {
1596 bfd_signed_vma *local_got_refcounts;
1597
1598 /* This is a global offset table entry for a local symbol. */
1599 local_got_refcounts = elf_local_got_refcounts (abfd);
1600 if (local_got_refcounts == NULL)
1601 {
1602 bfd_size_type size;
1603
1604 size = symtab_hdr->sh_info;
1605 size *= (sizeof (bfd_signed_vma)
1606 + sizeof (bfd_vma) + sizeof(char));
1607 local_got_refcounts = (bfd_signed_vma *)
1608 bfd_zalloc (abfd, size);
1609 if (local_got_refcounts == NULL)
1610 return FALSE;
1611 elf_local_got_refcounts (abfd) = local_got_refcounts;
1612 elf_i386_local_tlsdesc_gotent (abfd)
1613 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1614 elf_i386_local_got_tls_type (abfd)
1615 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1616 }
1617 local_got_refcounts[r_symndx] += 1;
1618 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1619 }
1620
1621 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1622 tls_type |= old_tls_type;
1623 /* If a TLS symbol is accessed using IE at least once,
1624 there is no point to use dynamic model for it. */
1625 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1626 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1627 || (tls_type & GOT_TLS_IE) == 0))
1628 {
1629 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1630 tls_type = old_tls_type;
1631 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1632 && GOT_TLS_GD_ANY_P (tls_type))
1633 tls_type |= old_tls_type;
1634 else
1635 {
1636 if (h)
1637 name = h->root.root.string;
1638 else
1639 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1640 NULL);
1641 (*_bfd_error_handler)
1642 (_("%B: `%s' accessed both as normal and "
1643 "thread local symbol"),
1644 abfd, name);
1645 bfd_set_error (bfd_error_bad_value);
1646 return FALSE;
1647 }
1648 }
1649
1650 if (old_tls_type != tls_type)
1651 {
1652 if (h != NULL)
1653 elf_i386_hash_entry (h)->tls_type = tls_type;
1654 else
1655 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1656 }
1657 }
1658 /* Fall through */
1659
1660 case R_386_GOTOFF:
1661 case R_386_GOTPC:
1662 create_got:
1663 if (htab->elf.sgot == NULL)
1664 {
1665 if (htab->elf.dynobj == NULL)
1666 htab->elf.dynobj = abfd;
1667 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1668 return FALSE;
1669 }
1670 if (r_type != R_386_TLS_IE)
1671 break;
1672 /* Fall through */
1673
1674 case R_386_TLS_LE_32:
1675 case R_386_TLS_LE:
1676 if (info->executable)
1677 break;
1678 info->flags |= DF_STATIC_TLS;
1679 /* Fall through */
1680
1681 case R_386_32:
1682 case R_386_PC32:
1683 if (h != NULL && info->executable)
1684 {
1685 /* If this reloc is in a read-only section, we might
1686 need a copy reloc. We can't check reliably at this
1687 stage whether the section is read-only, as input
1688 sections have not yet been mapped to output sections.
1689 Tentatively set the flag for now, and correct in
1690 adjust_dynamic_symbol. */
1691 h->non_got_ref = 1;
1692
1693 /* We may need a .plt entry if the function this reloc
1694 refers to is in a shared lib. */
1695 h->plt.refcount += 1;
1696 if (r_type != R_386_PC32)
1697 h->pointer_equality_needed = 1;
1698 }
1699
1700 size_reloc = FALSE;
1701do_size:
1702 /* If we are creating a shared library, and this is a reloc
1703 against a global symbol, or a non PC relative reloc
1704 against a local symbol, then we need to copy the reloc
1705 into the shared library. However, if we are linking with
1706 -Bsymbolic, we do not need to copy a reloc against a
1707 global symbol which is defined in an object we are
1708 including in the link (i.e., DEF_REGULAR is set). At
1709 this point we have not seen all the input files, so it is
1710 possible that DEF_REGULAR is not set now but will be set
1711 later (it is never cleared). In case of a weak definition,
1712 DEF_REGULAR may be cleared later by a strong definition in
1713 a shared library. We account for that possibility below by
1714 storing information in the relocs_copied field of the hash
1715 table entry. A similar situation occurs when creating
1716 shared libraries and symbol visibility changes render the
1717 symbol local.
1718
1719 If on the other hand, we are creating an executable, we
1720 may need to keep relocations for symbols satisfied by a
1721 dynamic library if we manage to avoid copy relocs for the
1722 symbol. */
1723 if ((info->shared
1724 && (sec->flags & SEC_ALLOC) != 0
1725 && (r_type != R_386_PC32
1726 || (h != NULL
1727 && (! SYMBOLIC_BIND (info, h)
1728 || h->root.type == bfd_link_hash_defweak
1729 || !h->def_regular))))
1730 || (ELIMINATE_COPY_RELOCS
1731 && !info->shared
1732 && (sec->flags & SEC_ALLOC) != 0
1733 && h != NULL
1734 && (h->root.type == bfd_link_hash_defweak
1735 || !h->def_regular)))
1736 {
1737 struct elf_dyn_relocs *p;
1738 struct elf_dyn_relocs **head;
1739
1740 /* We must copy these reloc types into the output file.
1741 Create a reloc section in dynobj and make room for
1742 this reloc. */
1743 if (sreloc == NULL)
1744 {
1745 if (htab->elf.dynobj == NULL)
1746 htab->elf.dynobj = abfd;
1747
1748 sreloc = _bfd_elf_make_dynamic_reloc_section
1749 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1750
1751 if (sreloc == NULL)
1752 return FALSE;
1753 }
1754
1755 /* If this is a global symbol, we count the number of
1756 relocations we need for this symbol. */
1757 if (h != NULL)
1758 {
1759 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1760 }
1761 else
1762 {
1763 /* Track dynamic relocs needed for local syms too.
1764 We really need local syms available to do this
1765 easily. Oh well. */
1766 void **vpp;
1767 asection *s;
1768
1769 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1770 abfd, r_symndx);
1771 if (isym == NULL)
1772 return FALSE;
1773
1774 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1775 if (s == NULL)
1776 s = sec;
1777
1778 vpp = &elf_section_data (s)->local_dynrel;
1779 head = (struct elf_dyn_relocs **)vpp;
1780 }
1781
1782 p = *head;
1783 if (p == NULL || p->sec != sec)
1784 {
1785 bfd_size_type amt = sizeof *p;
1786 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1787 amt);
1788 if (p == NULL)
1789 return FALSE;
1790 p->next = *head;
1791 *head = p;
1792 p->sec = sec;
1793 p->count = 0;
1794 p->pc_count = 0;
1795 }
1796
1797 p->count += 1;
1798 /* Count size relocation as PC-relative relocation. */
1799 if (r_type == R_386_PC32 || size_reloc)
1800 p->pc_count += 1;
1801 }
1802 break;
1803
1804 /* This relocation describes the C++ object vtable hierarchy.
1805 Reconstruct it for later use during GC. */
1806 case R_386_GNU_VTINHERIT:
1807 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1808 return FALSE;
1809 break;
1810
1811 /* This relocation describes which C++ vtable entries are actually
1812 used. Record for later use during GC. */
1813 case R_386_GNU_VTENTRY:
1814 BFD_ASSERT (h != NULL);
1815 if (h != NULL
1816 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1817 return FALSE;
1818 break;
1819
1820 default:
1821 break;
1822 }
1823 }
1824
1825 return TRUE;
1826}
1827
1828/* Return the section that should be marked against GC for a given
1829 relocation. */
1830
1831static asection *
1832elf_i386_gc_mark_hook (asection *sec,
1833 struct bfd_link_info *info,
1834 Elf_Internal_Rela *rel,
1835 struct elf_link_hash_entry *h,
1836 Elf_Internal_Sym *sym)
1837{
1838 if (h != NULL)
1839 switch (ELF32_R_TYPE (rel->r_info))
1840 {
1841 case R_386_GNU_VTINHERIT:
1842 case R_386_GNU_VTENTRY:
1843 return NULL;
1844 }
1845
1846 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1847}
1848
1849/* Update the got entry reference counts for the section being removed. */
1850
1851static bfd_boolean
1852elf_i386_gc_sweep_hook (bfd *abfd,
1853 struct bfd_link_info *info,
1854 asection *sec,
1855 const Elf_Internal_Rela *relocs)
1856{
1857 struct elf_i386_link_hash_table *htab;
1858 Elf_Internal_Shdr *symtab_hdr;
1859 struct elf_link_hash_entry **sym_hashes;
1860 bfd_signed_vma *local_got_refcounts;
1861 const Elf_Internal_Rela *rel, *relend;
1862
1863 if (info->relocatable)
1864 return TRUE;
1865
1866 htab = elf_i386_hash_table (info);
1867 if (htab == NULL)
1868 return FALSE;
1869
1870 elf_section_data (sec)->local_dynrel = NULL;
1871
1872 symtab_hdr = &elf_symtab_hdr (abfd);
1873 sym_hashes = elf_sym_hashes (abfd);
1874 local_got_refcounts = elf_local_got_refcounts (abfd);
1875
1876 relend = relocs + sec->reloc_count;
1877 for (rel = relocs; rel < relend; rel++)
1878 {
1879 unsigned long r_symndx;
1880 unsigned int r_type;
1881 struct elf_link_hash_entry *h = NULL;
1882
1883 r_symndx = ELF32_R_SYM (rel->r_info);
1884 if (r_symndx >= symtab_hdr->sh_info)
1885 {
1886 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1887 while (h->root.type == bfd_link_hash_indirect
1888 || h->root.type == bfd_link_hash_warning)
1889 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1890 }
1891 else
1892 {
1893 /* A local symbol. */
1894 Elf_Internal_Sym *isym;
1895
1896 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1897 abfd, r_symndx);
1898
1899 /* Check relocation against local STT_GNU_IFUNC symbol. */
1900 if (isym != NULL
1901 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1902 {
1903 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1904 if (h == NULL)
1905 abort ();
1906 }
1907 }
1908
1909 if (h)
1910 {
1911 struct elf_i386_link_hash_entry *eh;
1912 struct elf_dyn_relocs **pp;
1913 struct elf_dyn_relocs *p;
1914
1915 eh = (struct elf_i386_link_hash_entry *) h;
1916 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1917 if (p->sec == sec)
1918 {
1919 /* Everything must go for SEC. */
1920 *pp = p->next;
1921 break;
1922 }
1923 }
1924
1925 r_type = ELF32_R_TYPE (rel->r_info);
1926 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1927 symtab_hdr, sym_hashes,
1928 &r_type, GOT_UNKNOWN,
1929 rel, relend, h, r_symndx))
1930 return FALSE;
1931
1932 switch (r_type)
1933 {
1934 case R_386_TLS_LDM:
1935 if (htab->tls_ldm_got.refcount > 0)
1936 htab->tls_ldm_got.refcount -= 1;
1937 break;
1938
1939 case R_386_TLS_GD:
1940 case R_386_TLS_GOTDESC:
1941 case R_386_TLS_DESC_CALL:
1942 case R_386_TLS_IE_32:
1943 case R_386_TLS_IE:
1944 case R_386_TLS_GOTIE:
1945 case R_386_GOT32:
1946 if (h != NULL)
1947 {
1948 if (h->got.refcount > 0)
1949 h->got.refcount -= 1;
1950 if (h->type == STT_GNU_IFUNC)
1951 {
1952 if (h->plt.refcount > 0)
1953 h->plt.refcount -= 1;
1954 }
1955 }
1956 else if (local_got_refcounts != NULL)
1957 {
1958 if (local_got_refcounts[r_symndx] > 0)
1959 local_got_refcounts[r_symndx] -= 1;
1960 }
1961 break;
1962
1963 case R_386_32:
1964 case R_386_PC32:
1965 case R_386_SIZE32:
1966 if (info->shared
1967 && (h == NULL || h->type != STT_GNU_IFUNC))
1968 break;
1969 /* Fall through */
1970
1971 case R_386_PLT32:
1972 if (h != NULL)
1973 {
1974 if (h->plt.refcount > 0)
1975 h->plt.refcount -= 1;
1976 }
1977 break;
1978
1979 case R_386_GOTOFF:
1980 if (h != NULL && h->type == STT_GNU_IFUNC)
1981 {
1982 if (h->got.refcount > 0)
1983 h->got.refcount -= 1;
1984 if (h->plt.refcount > 0)
1985 h->plt.refcount -= 1;
1986 }
1987 break;
1988
1989 default:
1990 break;
1991 }
1992 }
1993
1994 return TRUE;
1995}
1996
1997/* Adjust a symbol defined by a dynamic object and referenced by a
1998 regular object. The current definition is in some section of the
1999 dynamic object, but we're not including those sections. We have to
2000 change the definition to something the rest of the link can
2001 understand. */
2002
2003static bfd_boolean
2004elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2005 struct elf_link_hash_entry *h)
2006{
2007 struct elf_i386_link_hash_table *htab;
2008 asection *s;
2009 struct elf_i386_link_hash_entry *eh;
2010 struct elf_dyn_relocs *p;
2011
2012 /* STT_GNU_IFUNC symbol must go through PLT. */
2013 if (h->type == STT_GNU_IFUNC)
2014 {
2015 /* All local STT_GNU_IFUNC references must be treate as local
2016 calls via local PLT. */
2017 if (h->ref_regular
2018 && SYMBOL_CALLS_LOCAL (info, h))
2019 {
2020 bfd_size_type pc_count = 0, count = 0;
2021 struct elf_dyn_relocs **pp;
2022
2023 eh = (struct elf_i386_link_hash_entry *) h;
2024 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2025 {
2026 pc_count += p->pc_count;
2027 p->count -= p->pc_count;
2028 p->pc_count = 0;
2029 count += p->count;
2030 if (p->count == 0)
2031 *pp = p->next;
2032 else
2033 pp = &p->next;
2034 }
2035
2036 if (pc_count || count)
2037 {
2038 h->needs_plt = 1;
2039 h->non_got_ref = 1;
2040 if (h->plt.refcount <= 0)
2041 h->plt.refcount = 1;
2042 else
2043 h->plt.refcount += 1;
2044 }
2045 }
2046
2047 if (h->plt.refcount <= 0)
2048 {
2049 h->plt.offset = (bfd_vma) -1;
2050 h->needs_plt = 0;
2051 }
2052 return TRUE;
2053 }
2054
2055 /* If this is a function, put it in the procedure linkage table. We
2056 will fill in the contents of the procedure linkage table later,
2057 when we know the address of the .got section. */
2058 if (h->type == STT_FUNC
2059 || h->needs_plt)
2060 {
2061 if (h->plt.refcount <= 0
2062 || SYMBOL_CALLS_LOCAL (info, h)
2063 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2064 && h->root.type == bfd_link_hash_undefweak))
2065 {
2066 /* This case can occur if we saw a PLT32 reloc in an input
2067 file, but the symbol was never referred to by a dynamic
2068 object, or if all references were garbage collected. In
2069 such a case, we don't actually need to build a procedure
2070 linkage table, and we can just do a PC32 reloc instead. */
2071 h->plt.offset = (bfd_vma) -1;
2072 h->needs_plt = 0;
2073 }
2074
2075 return TRUE;
2076 }
2077 else
2078 /* It's possible that we incorrectly decided a .plt reloc was
2079 needed for an R_386_PC32 reloc to a non-function sym in
2080 check_relocs. We can't decide accurately between function and
2081 non-function syms in check-relocs; Objects loaded later in
2082 the link may change h->type. So fix it now. */
2083 h->plt.offset = (bfd_vma) -1;
2084
2085 /* If this is a weak symbol, and there is a real definition, the
2086 processor independent code will have arranged for us to see the
2087 real definition first, and we can just use the same value. */
2088 if (h->u.weakdef != NULL)
2089 {
2090 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2091 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2092 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2093 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2094 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2095 h->non_got_ref = h->u.weakdef->non_got_ref;
2096 return TRUE;
2097 }
2098
2099 /* This is a reference to a symbol defined by a dynamic object which
2100 is not a function. */
2101
2102 /* If we are creating a shared library, we must presume that the
2103 only references to the symbol are via the global offset table.
2104 For such cases we need not do anything here; the relocations will
2105 be handled correctly by relocate_section. */
2106 if (info->shared)
2107 return TRUE;
2108
2109 /* If there are no references to this symbol that do not use the
2110 GOT, we don't need to generate a copy reloc. */
2111 if (!h->non_got_ref)
2112 return TRUE;
2113
2114 /* If -z nocopyreloc was given, we won't generate them either. */
2115 if (info->nocopyreloc)
2116 {
2117 h->non_got_ref = 0;
2118 return TRUE;
2119 }
2120
2121 htab = elf_i386_hash_table (info);
2122 if (htab == NULL)
2123 return FALSE;
2124
2125 /* If there aren't any dynamic relocs in read-only sections, then
2126 we can keep the dynamic relocs and avoid the copy reloc. This
2127 doesn't work on VxWorks, where we can not have dynamic relocations
2128 (other than copy and jump slot relocations) in an executable. */
2129 if (ELIMINATE_COPY_RELOCS
2130 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2131 {
2132 eh = (struct elf_i386_link_hash_entry *) h;
2133 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2134 {
2135 s = p->sec->output_section;
2136 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2137 break;
2138 }
2139
2140 if (p == NULL)
2141 {
2142 h->non_got_ref = 0;
2143 return TRUE;
2144 }
2145 }
2146
2147 /* We must allocate the symbol in our .dynbss section, which will
2148 become part of the .bss section of the executable. There will be
2149 an entry for this symbol in the .dynsym section. The dynamic
2150 object will contain position independent code, so all references
2151 from the dynamic object to this symbol will go through the global
2152 offset table. The dynamic linker will use the .dynsym entry to
2153 determine the address it must put in the global offset table, so
2154 both the dynamic object and the regular object will refer to the
2155 same memory location for the variable. */
2156
2157 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2158 copy the initial value out of the dynamic object and into the
2159 runtime process image. */
2160 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2161 {
2162 htab->srelbss->size += sizeof (Elf32_External_Rel);
2163 h->needs_copy = 1;
2164 }
2165
2166 s = htab->sdynbss;
2167
2168 return _bfd_elf_adjust_dynamic_copy (h, s);
2169}
2170
2171/* Allocate space in .plt, .got and associated reloc sections for
2172 dynamic relocs. */
2173
2174static bfd_boolean
2175elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2176{
2177 struct bfd_link_info *info;
2178 struct elf_i386_link_hash_table *htab;
2179 struct elf_i386_link_hash_entry *eh;
2180 struct elf_dyn_relocs *p;
2181 unsigned plt_entry_size;
2182
2183 if (h->root.type == bfd_link_hash_indirect)
2184 return TRUE;
2185
2186 eh = (struct elf_i386_link_hash_entry *) h;
2187
2188 info = (struct bfd_link_info *) inf;
2189 htab = elf_i386_hash_table (info);
2190 if (htab == NULL)
2191 return FALSE;
2192
2193 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2194
2195 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2196 here if it is defined and referenced in a non-shared object. */
2197 if (h->type == STT_GNU_IFUNC
2198 && h->def_regular)
2199 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2200 plt_entry_size,
2201 plt_entry_size, 4);
2202 else if (htab->elf.dynamic_sections_created
2203 && h->plt.refcount > 0)
2204 {
2205 /* Make sure this symbol is output as a dynamic symbol.
2206 Undefined weak syms won't yet be marked as dynamic. */
2207 if (h->dynindx == -1
2208 && !h->forced_local)
2209 {
2210 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2211 return FALSE;
2212 }
2213
2214 if (info->shared
2215 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2216 {
2217 asection *s = htab->elf.splt;
2218
2219 /* If this is the first .plt entry, make room for the special
2220 first entry. */
2221 if (s->size == 0)
2222 s->size = plt_entry_size;
2223
2224 h->plt.offset = s->size;
2225
2226 /* If this symbol is not defined in a regular file, and we are
2227 not generating a shared library, then set the symbol to this
2228 location in the .plt. This is required to make function
2229 pointers compare as equal between the normal executable and
2230 the shared library. */
2231 if (! info->shared
2232 && !h->def_regular)
2233 {
2234 h->root.u.def.section = s;
2235 h->root.u.def.value = h->plt.offset;
2236 }
2237
2238 /* Make room for this entry. */
2239 s->size += plt_entry_size;
2240
2241 /* We also need to make an entry in the .got.plt section, which
2242 will be placed in the .got section by the linker script. */
2243 htab->elf.sgotplt->size += 4;
2244
2245 /* We also need to make an entry in the .rel.plt section. */
2246 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2247 htab->elf.srelplt->reloc_count++;
2248
2249 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2250 && !info->shared)
2251 {
2252 /* VxWorks has a second set of relocations for each PLT entry
2253 in executables. They go in a separate relocation section,
2254 which is processed by the kernel loader. */
2255
2256 /* There are two relocations for the initial PLT entry: an
2257 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2258 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2259
2260 if (h->plt.offset == plt_entry_size)
2261 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2262
2263 /* There are two extra relocations for each subsequent PLT entry:
2264 an R_386_32 relocation for the GOT entry, and an R_386_32
2265 relocation for the PLT entry. */
2266
2267 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2268 }
2269 }
2270 else
2271 {
2272 h->plt.offset = (bfd_vma) -1;
2273 h->needs_plt = 0;
2274 }
2275 }
2276 else
2277 {
2278 h->plt.offset = (bfd_vma) -1;
2279 h->needs_plt = 0;
2280 }
2281
2282 eh->tlsdesc_got = (bfd_vma) -1;
2283
2284 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2285 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2286 if (h->got.refcount > 0
2287 && info->executable
2288 && h->dynindx == -1
2289 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2290 h->got.offset = (bfd_vma) -1;
2291 else if (h->got.refcount > 0)
2292 {
2293 asection *s;
2294 bfd_boolean dyn;
2295 int tls_type = elf_i386_hash_entry(h)->tls_type;
2296
2297 /* Make sure this symbol is output as a dynamic symbol.
2298 Undefined weak syms won't yet be marked as dynamic. */
2299 if (h->dynindx == -1
2300 && !h->forced_local)
2301 {
2302 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2303 return FALSE;
2304 }
2305
2306 s = htab->elf.sgot;
2307 if (GOT_TLS_GDESC_P (tls_type))
2308 {
2309 eh->tlsdesc_got = htab->elf.sgotplt->size
2310 - elf_i386_compute_jump_table_size (htab);
2311 htab->elf.sgotplt->size += 8;
2312 h->got.offset = (bfd_vma) -2;
2313 }
2314 if (! GOT_TLS_GDESC_P (tls_type)
2315 || GOT_TLS_GD_P (tls_type))
2316 {
2317 h->got.offset = s->size;
2318 s->size += 4;
2319 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2320 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2321 s->size += 4;
2322 }
2323 dyn = htab->elf.dynamic_sections_created;
2324 /* R_386_TLS_IE_32 needs one dynamic relocation,
2325 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2326 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2327 need two), R_386_TLS_GD needs one if local symbol and two if
2328 global. */
2329 if (tls_type == GOT_TLS_IE_BOTH)
2330 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2331 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2332 || (tls_type & GOT_TLS_IE))
2333 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2334 else if (GOT_TLS_GD_P (tls_type))
2335 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2336 else if (! GOT_TLS_GDESC_P (tls_type)
2337 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2338 || h->root.type != bfd_link_hash_undefweak)
2339 && (info->shared
2340 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2341 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2342 if (GOT_TLS_GDESC_P (tls_type))
2343 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2344 }
2345 else
2346 h->got.offset = (bfd_vma) -1;
2347
2348 if (eh->dyn_relocs == NULL)
2349 return TRUE;
2350
2351 /* In the shared -Bsymbolic case, discard space allocated for
2352 dynamic pc-relative relocs against symbols which turn out to be
2353 defined in regular objects. For the normal shared case, discard
2354 space for pc-relative relocs that have become local due to symbol
2355 visibility changes. */
2356
2357 if (info->shared)
2358 {
2359 /* The only reloc that uses pc_count is R_386_PC32, which will
2360 appear on a call or on something like ".long foo - .". We
2361 want calls to protected symbols to resolve directly to the
2362 function rather than going via the plt. If people want
2363 function pointer comparisons to work as expected then they
2364 should avoid writing assembly like ".long foo - .". */
2365 if (SYMBOL_CALLS_LOCAL (info, h))
2366 {
2367 struct elf_dyn_relocs **pp;
2368
2369 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2370 {
2371 p->count -= p->pc_count;
2372 p->pc_count = 0;
2373 if (p->count == 0)
2374 *pp = p->next;
2375 else
2376 pp = &p->next;
2377 }
2378 }
2379
2380 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2381 {
2382 struct elf_dyn_relocs **pp;
2383 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2384 {
2385 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2386 *pp = p->next;
2387 else
2388 pp = &p->next;
2389 }
2390 }
2391
2392 /* Also discard relocs on undefined weak syms with non-default
2393 visibility. Don't discard relocs against __ehdr_start which
2394 will be defined by assign_file_positions_for_non_load_sections
2395 later. */
2396 if (eh->dyn_relocs != NULL
2397 && h->root.type == bfd_link_hash_undefweak
2398 && strcmp (h->root.root.string, "__ehdr_start") != 0)
2399 {
2400 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2401 eh->dyn_relocs = NULL;
2402
2403 /* Make sure undefined weak symbols are output as a dynamic
2404 symbol in PIEs. */
2405 else if (h->dynindx == -1
2406 && !h->forced_local)
2407 {
2408 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2409 return FALSE;
2410 }
2411 }
2412 }
2413 else if (ELIMINATE_COPY_RELOCS)
2414 {
2415 /* For the non-shared case, discard space for relocs against
2416 symbols which turn out to need copy relocs or are not
2417 dynamic. */
2418
2419 if (!h->non_got_ref
2420 && ((h->def_dynamic
2421 && !h->def_regular)
2422 || (htab->elf.dynamic_sections_created
2423 && (h->root.type == bfd_link_hash_undefweak
2424 || h->root.type == bfd_link_hash_undefined))))
2425 {
2426 /* Make sure this symbol is output as a dynamic symbol.
2427 Undefined weak syms won't yet be marked as dynamic. */
2428 if (h->dynindx == -1
2429 && !h->forced_local)
2430 {
2431 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2432 return FALSE;
2433 }
2434
2435 /* If that succeeded, we know we'll be keeping all the
2436 relocs. */
2437 if (h->dynindx != -1)
2438 goto keep;
2439 }
2440
2441 eh->dyn_relocs = NULL;
2442
2443 keep: ;
2444 }
2445
2446 /* Finally, allocate space. */
2447 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2448 {
2449 asection *sreloc;
2450
2451 sreloc = elf_section_data (p->sec)->sreloc;
2452
2453 BFD_ASSERT (sreloc != NULL);
2454 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2455 }
2456
2457 return TRUE;
2458}
2459
2460/* Allocate space in .plt, .got and associated reloc sections for
2461 local dynamic relocs. */
2462
2463static bfd_boolean
2464elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2465{
2466 struct elf_link_hash_entry *h
2467 = (struct elf_link_hash_entry *) *slot;
2468
2469 if (h->type != STT_GNU_IFUNC
2470 || !h->def_regular
2471 || !h->ref_regular
2472 || !h->forced_local
2473 || h->root.type != bfd_link_hash_defined)
2474 abort ();
2475
2476 return elf_i386_allocate_dynrelocs (h, inf);
2477}
2478
2479/* Find any dynamic relocs that apply to read-only sections. */
2480
2481static bfd_boolean
2482elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2483{
2484 struct elf_i386_link_hash_entry *eh;
2485 struct elf_dyn_relocs *p;
2486
2487 /* Skip local IFUNC symbols. */
2488 if (h->forced_local && h->type == STT_GNU_IFUNC)
2489 return TRUE;
2490
2491 eh = (struct elf_i386_link_hash_entry *) h;
2492 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2493 {
2494 asection *s = p->sec->output_section;
2495
2496 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2497 {
2498 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2499
2500 info->flags |= DF_TEXTREL;
2501
2502 if (info->warn_shared_textrel && info->shared)
2503 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2504 p->sec->owner, h->root.root.string,
2505 p->sec);
2506
2507 /* Not an error, just cut short the traversal. */
2508 return FALSE;
2509 }
2510 }
2511 return TRUE;
2512}
2513
2514/* Convert
2515 mov foo@GOT(%reg), %reg
2516 to
2517 lea foo@GOTOFF(%reg), %reg
2518 with the local symbol, foo. */
2519
2520static bfd_boolean
2521elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2522 struct bfd_link_info *link_info)
2523{
2524 Elf_Internal_Shdr *symtab_hdr;
2525 Elf_Internal_Rela *internal_relocs;
2526 Elf_Internal_Rela *irel, *irelend;
2527 bfd_byte *contents;
2528 struct elf_i386_link_hash_table *htab;
2529 bfd_boolean changed_contents;
2530 bfd_boolean changed_relocs;
2531 bfd_signed_vma *local_got_refcounts;
2532
2533 /* Don't even try to convert non-ELF outputs. */
2534 if (!is_elf_hash_table (link_info->hash))
2535 return FALSE;
2536
2537 /* Nothing to do if there are no codes, no relocations or no output. */
2538 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2539 || sec->reloc_count == 0
2540 || discarded_section (sec))
2541 return TRUE;
2542
2543 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2544
2545 /* Load the relocations for this section. */
2546 internal_relocs = (_bfd_elf_link_read_relocs
2547 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2548 link_info->keep_memory));
2549 if (internal_relocs == NULL)
2550 return FALSE;
2551
2552 htab = elf_i386_hash_table (link_info);
2553 changed_contents = FALSE;
2554 changed_relocs = FALSE;
2555 local_got_refcounts = elf_local_got_refcounts (abfd);
2556
2557 /* Get the section contents. */
2558 if (elf_section_data (sec)->this_hdr.contents != NULL)
2559 contents = elf_section_data (sec)->this_hdr.contents;
2560 else
2561 {
2562 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2563 goto error_return;
2564 }
2565
2566 irelend = internal_relocs + sec->reloc_count;
2567 for (irel = internal_relocs; irel < irelend; irel++)
2568 {
2569 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2570 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2571 unsigned int indx;
2572 struct elf_link_hash_entry *h;
2573
2574 if (r_type != R_386_GOT32)
2575 continue;
2576
2577 /* Get the symbol referred to by the reloc. */
2578 if (r_symndx < symtab_hdr->sh_info)
2579 {
2580 Elf_Internal_Sym *isym;
2581
2582 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2583 abfd, r_symndx);
2584
2585 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2586 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2587 && bfd_get_8 (input_bfd,
2588 contents + irel->r_offset - 2) == 0x8b)
2589 {
2590 bfd_put_8 (output_bfd, 0x8d,
2591 contents + irel->r_offset - 2);
2592 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2593 if (local_got_refcounts != NULL
2594 && local_got_refcounts[r_symndx] > 0)
2595 local_got_refcounts[r_symndx] -= 1;
2596 changed_contents = TRUE;
2597 changed_relocs = TRUE;
2598 }
2599 continue;
2600 }
2601
2602 indx = r_symndx - symtab_hdr->sh_info;
2603 h = elf_sym_hashes (abfd)[indx];
2604 BFD_ASSERT (h != NULL);
2605
2606 while (h->root.type == bfd_link_hash_indirect
2607 || h->root.type == bfd_link_hash_warning)
2608 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2609
2610 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2611 optimizing _DYNAMIC since ld.so may use its link-time address. */
2612 if (h->def_regular
2613 && h->type != STT_GNU_IFUNC
2614 && h != htab->elf.hdynamic
2615 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2616 && bfd_get_8 (input_bfd,
2617 contents + irel->r_offset - 2) == 0x8b)
2618 {
2619 bfd_put_8 (output_bfd, 0x8d,
2620 contents + irel->r_offset - 2);
2621 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2622 if (h->got.refcount > 0)
2623 h->got.refcount -= 1;
2624 changed_contents = TRUE;
2625 changed_relocs = TRUE;
2626 }
2627 }
2628
2629 if (contents != NULL
2630 && elf_section_data (sec)->this_hdr.contents != contents)
2631 {
2632 if (!changed_contents && !link_info->keep_memory)
2633 free (contents);
2634 else
2635 {
2636 /* Cache the section contents for elf_link_input_bfd. */
2637 elf_section_data (sec)->this_hdr.contents = contents;
2638 }
2639 }
2640
2641 if (elf_section_data (sec)->relocs != internal_relocs)
2642 {
2643 if (!changed_relocs)
2644 free (internal_relocs);
2645 else
2646 elf_section_data (sec)->relocs = internal_relocs;
2647 }
2648
2649 return TRUE;
2650
2651 error_return:
2652 if (contents != NULL
2653 && elf_section_data (sec)->this_hdr.contents != contents)
2654 free (contents);
2655 if (internal_relocs != NULL
2656 && elf_section_data (sec)->relocs != internal_relocs)
2657 free (internal_relocs);
2658 return FALSE;
2659}
2660
2661/* Set the sizes of the dynamic sections. */
2662
2663static bfd_boolean
2664elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2665{
2666 struct elf_i386_link_hash_table *htab;
2667 bfd *dynobj;
2668 asection *s;
2669 bfd_boolean relocs;
2670 bfd *ibfd;
2671
2672 htab = elf_i386_hash_table (info);
2673 if (htab == NULL)
2674 return FALSE;
2675 dynobj = htab->elf.dynobj;
2676 if (dynobj == NULL)
2677 abort ();
2678
2679 if (htab->elf.dynamic_sections_created)
2680 {
2681 /* Set the contents of the .interp section to the interpreter. */
2682 if (info->executable)
2683 {
2684 s = bfd_get_linker_section (dynobj, ".interp");
2685 if (s == NULL)
2686 abort ();
2687 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2688 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2689 }
2690 }
2691
2692 /* Set up .got offsets for local syms, and space for local dynamic
2693 relocs. */
2694 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2695 {
2696 bfd_signed_vma *local_got;
2697 bfd_signed_vma *end_local_got;
2698 char *local_tls_type;
2699 bfd_vma *local_tlsdesc_gotent;
2700 bfd_size_type locsymcount;
2701 Elf_Internal_Shdr *symtab_hdr;
2702 asection *srel;
2703
2704 if (! is_i386_elf (ibfd))
2705 continue;
2706
2707 for (s = ibfd->sections; s != NULL; s = s->next)
2708 {
2709 struct elf_dyn_relocs *p;
2710
2711 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2712 return FALSE;
2713
2714 for (p = ((struct elf_dyn_relocs *)
2715 elf_section_data (s)->local_dynrel);
2716 p != NULL;
2717 p = p->next)
2718 {
2719 if (!bfd_is_abs_section (p->sec)
2720 && bfd_is_abs_section (p->sec->output_section))
2721 {
2722 /* Input section has been discarded, either because
2723 it is a copy of a linkonce section or due to
2724 linker script /DISCARD/, so we'll be discarding
2725 the relocs too. */
2726 }
2727 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2728 && strcmp (p->sec->output_section->name,
2729 ".tls_vars") == 0)
2730 {
2731 /* Relocations in vxworks .tls_vars sections are
2732 handled specially by the loader. */
2733 }
2734 else if (p->count != 0)
2735 {
2736 srel = elf_section_data (p->sec)->sreloc;
2737 srel->size += p->count * sizeof (Elf32_External_Rel);
2738 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2739 && (info->flags & DF_TEXTREL) == 0)
2740 {
2741 info->flags |= DF_TEXTREL;
2742 if (info->warn_shared_textrel && info->shared)
2743 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2744 p->sec->owner, p->sec);
2745 }
2746 }
2747 }
2748 }
2749
2750 local_got = elf_local_got_refcounts (ibfd);
2751 if (!local_got)
2752 continue;
2753
2754 symtab_hdr = &elf_symtab_hdr (ibfd);
2755 locsymcount = symtab_hdr->sh_info;
2756 end_local_got = local_got + locsymcount;
2757 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2758 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2759 s = htab->elf.sgot;
2760 srel = htab->elf.srelgot;
2761 for (; local_got < end_local_got;
2762 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2763 {
2764 *local_tlsdesc_gotent = (bfd_vma) -1;
2765 if (*local_got > 0)
2766 {
2767 if (GOT_TLS_GDESC_P (*local_tls_type))
2768 {
2769 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2770 - elf_i386_compute_jump_table_size (htab);
2771 htab->elf.sgotplt->size += 8;
2772 *local_got = (bfd_vma) -2;
2773 }
2774 if (! GOT_TLS_GDESC_P (*local_tls_type)
2775 || GOT_TLS_GD_P (*local_tls_type))
2776 {
2777 *local_got = s->size;
2778 s->size += 4;
2779 if (GOT_TLS_GD_P (*local_tls_type)
2780 || *local_tls_type == GOT_TLS_IE_BOTH)
2781 s->size += 4;
2782 }
2783 if (info->shared
2784 || GOT_TLS_GD_ANY_P (*local_tls_type)
2785 || (*local_tls_type & GOT_TLS_IE))
2786 {
2787 if (*local_tls_type == GOT_TLS_IE_BOTH)
2788 srel->size += 2 * sizeof (Elf32_External_Rel);
2789 else if (GOT_TLS_GD_P (*local_tls_type)
2790 || ! GOT_TLS_GDESC_P (*local_tls_type))
2791 srel->size += sizeof (Elf32_External_Rel);
2792 if (GOT_TLS_GDESC_P (*local_tls_type))
2793 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2794 }
2795 }
2796 else
2797 *local_got = (bfd_vma) -1;
2798 }
2799 }
2800
2801 if (htab->tls_ldm_got.refcount > 0)
2802 {
2803 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2804 relocs. */
2805 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2806 htab->elf.sgot->size += 8;
2807 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2808 }
2809 else
2810 htab->tls_ldm_got.offset = -1;
2811
2812 /* Allocate global sym .plt and .got entries, and space for global
2813 sym dynamic relocs. */
2814 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2815
2816 /* Allocate .plt and .got entries, and space for local symbols. */
2817 htab_traverse (htab->loc_hash_table,
2818 elf_i386_allocate_local_dynrelocs,
2819 info);
2820
2821 /* For every jump slot reserved in the sgotplt, reloc_count is
2822 incremented. However, when we reserve space for TLS descriptors,
2823 it's not incremented, so in order to compute the space reserved
2824 for them, it suffices to multiply the reloc count by the jump
2825 slot size.
2826
2827 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2828 so that R_386_IRELATIVE entries come last. */
2829 if (htab->elf.srelplt)
2830 {
2831 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2832 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2833 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2834 }
2835 else if (htab->elf.irelplt)
2836 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2837
2838
2839 if (htab->elf.sgotplt)
2840 {
2841 /* Don't allocate .got.plt section if there are no GOT nor PLT
2842 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2843 if ((htab->elf.hgot == NULL
2844 || !htab->elf.hgot->ref_regular_nonweak)
2845 && (htab->elf.sgotplt->size
2846 == get_elf_backend_data (output_bfd)->got_header_size)
2847 && (htab->elf.splt == NULL
2848 || htab->elf.splt->size == 0)
2849 && (htab->elf.sgot == NULL
2850 || htab->elf.sgot->size == 0)
2851 && (htab->elf.iplt == NULL
2852 || htab->elf.iplt->size == 0)
2853 && (htab->elf.igotplt == NULL
2854 || htab->elf.igotplt->size == 0))
2855 htab->elf.sgotplt->size = 0;
2856 }
2857
2858
2859 if (htab->plt_eh_frame != NULL
2860 && htab->elf.splt != NULL
2861 && htab->elf.splt->size != 0
2862 && !bfd_is_abs_section (htab->elf.splt->output_section)
2863 && _bfd_elf_eh_frame_present (info))
2864 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2865
2866 /* We now have determined the sizes of the various dynamic sections.
2867 Allocate memory for them. */
2868 relocs = FALSE;
2869 for (s = dynobj->sections; s != NULL; s = s->next)
2870 {
2871 bfd_boolean strip_section = TRUE;
2872
2873 if ((s->flags & SEC_LINKER_CREATED) == 0)
2874 continue;
2875
2876 if (s == htab->elf.splt
2877 || s == htab->elf.sgot)
2878 {
2879 /* Strip this section if we don't need it; see the
2880 comment below. */
2881 /* We'd like to strip these sections if they aren't needed, but if
2882 we've exported dynamic symbols from them we must leave them.
2883 It's too late to tell BFD to get rid of the symbols. */
2884
2885 if (htab->elf.hplt != NULL)
2886 strip_section = FALSE;
2887 }
2888 else if (s == htab->elf.sgotplt
2889 || s == htab->elf.iplt
2890 || s == htab->elf.igotplt
2891 || s == htab->plt_eh_frame
2892 || s == htab->sdynbss)
2893 {
2894 /* Strip these too. */
2895 }
2896 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2897 {
2898 if (s->size != 0
2899 && s != htab->elf.srelplt
2900 && s != htab->srelplt2)
2901 relocs = TRUE;
2902
2903 /* We use the reloc_count field as a counter if we need
2904 to copy relocs into the output file. */
2905 s->reloc_count = 0;
2906 }
2907 else
2908 {
2909 /* It's not one of our sections, so don't allocate space. */
2910 continue;
2911 }
2912
2913 if (s->size == 0)
2914 {
2915 /* If we don't need this section, strip it from the
2916 output file. This is mostly to handle .rel.bss and
2917 .rel.plt. We must create both sections in
2918 create_dynamic_sections, because they must be created
2919 before the linker maps input sections to output
2920 sections. The linker does that before
2921 adjust_dynamic_symbol is called, and it is that
2922 function which decides whether anything needs to go
2923 into these sections. */
2924 if (strip_section)
2925 s->flags |= SEC_EXCLUDE;
2926 continue;
2927 }
2928
2929 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2930 continue;
2931
2932 /* Allocate memory for the section contents. We use bfd_zalloc
2933 here in case unused entries are not reclaimed before the
2934 section's contents are written out. This should not happen,
2935 but this way if it does, we get a R_386_NONE reloc instead
2936 of garbage. */
2937 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2938 if (s->contents == NULL)
2939 return FALSE;
2940 }
2941
2942 if (htab->plt_eh_frame != NULL
2943 && htab->plt_eh_frame->contents != NULL)
2944 {
2945 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2946 sizeof (elf_i386_eh_frame_plt));
2947 bfd_put_32 (dynobj, htab->elf.splt->size,
2948 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2949 }
2950
2951 if (htab->elf.dynamic_sections_created)
2952 {
2953 /* Add some entries to the .dynamic section. We fill in the
2954 values later, in elf_i386_finish_dynamic_sections, but we
2955 must add the entries now so that we get the correct size for
2956 the .dynamic section. The DT_DEBUG entry is filled in by the
2957 dynamic linker and used by the debugger. */
2958#define add_dynamic_entry(TAG, VAL) \
2959 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2960
2961 if (info->executable)
2962 {
2963 if (!add_dynamic_entry (DT_DEBUG, 0))
2964 return FALSE;
2965 }
2966
2967 if (htab->elf.splt->size != 0)
2968 {
2969 if (!add_dynamic_entry (DT_PLTGOT, 0)
2970 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2971 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2972 || !add_dynamic_entry (DT_JMPREL, 0))
2973 return FALSE;
2974 }
2975
2976 if (relocs)
2977 {
2978 if (!add_dynamic_entry (DT_REL, 0)
2979 || !add_dynamic_entry (DT_RELSZ, 0)
2980 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2981 return FALSE;
2982
2983 /* If any dynamic relocs apply to a read-only section,
2984 then we need a DT_TEXTREL entry. */
2985 if ((info->flags & DF_TEXTREL) == 0)
2986 elf_link_hash_traverse (&htab->elf,
2987 elf_i386_readonly_dynrelocs, info);
2988
2989 if ((info->flags & DF_TEXTREL) != 0)
2990 {
2991 if (!add_dynamic_entry (DT_TEXTREL, 0))
2992 return FALSE;
2993 }
2994 }
2995 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2996 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2997 return FALSE;
2998 }
2999#undef add_dynamic_entry
3000
3001 return TRUE;
3002}
3003
3004static bfd_boolean
3005elf_i386_always_size_sections (bfd *output_bfd,
3006 struct bfd_link_info *info)
3007{
3008 asection *tls_sec = elf_hash_table (info)->tls_sec;
3009
3010 if (tls_sec)
3011 {
3012 struct elf_link_hash_entry *tlsbase;
3013
3014 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3015 "_TLS_MODULE_BASE_",
3016 FALSE, FALSE, FALSE);
3017
3018 if (tlsbase && tlsbase->type == STT_TLS)
3019 {
3020 struct elf_i386_link_hash_table *htab;
3021 struct bfd_link_hash_entry *bh = NULL;
3022 const struct elf_backend_data *bed
3023 = get_elf_backend_data (output_bfd);
3024
3025 htab = elf_i386_hash_table (info);
3026 if (htab == NULL)
3027 return FALSE;
3028
3029 if (!(_bfd_generic_link_add_one_symbol
3030 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3031 tls_sec, 0, NULL, FALSE,
3032 bed->collect, &bh)))
3033 return FALSE;
3034
3035 htab->tls_module_base = bh;
3036
3037 tlsbase = (struct elf_link_hash_entry *)bh;
3038 tlsbase->def_regular = 1;
3039 tlsbase->other = STV_HIDDEN;
3040 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3041 }
3042 }
3043
3044 return TRUE;
3045}
3046
3047/* Set the correct type for an x86 ELF section. We do this by the
3048 section name, which is a hack, but ought to work. */
3049
3050static bfd_boolean
3051elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3052 Elf_Internal_Shdr *hdr,
3053 asection *sec)
3054{
3055 const char *name;
3056
3057 name = bfd_get_section_name (abfd, sec);
3058
3059 /* This is an ugly, but unfortunately necessary hack that is
3060 needed when producing EFI binaries on x86. It tells
3061 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3062 containing ELF relocation info. We need this hack in order to
3063 be able to generate ELF binaries that can be translated into
3064 EFI applications (which are essentially COFF objects). Those
3065 files contain a COFF ".reloc" section inside an ELFNN object,
3066 which would normally cause BFD to segfault because it would
3067 attempt to interpret this section as containing relocation
3068 entries for section "oc". With this hack enabled, ".reloc"
3069 will be treated as a normal data section, which will avoid the
3070 segfault. However, you won't be able to create an ELFNN binary
3071 with a section named "oc" that needs relocations, but that's
3072 the kind of ugly side-effects you get when detecting section
3073 types based on their names... In practice, this limitation is
3074 unlikely to bite. */
3075 if (strcmp (name, ".reloc") == 0)
3076 hdr->sh_type = SHT_PROGBITS;
3077
3078 return TRUE;
3079}
3080
3081/* _TLS_MODULE_BASE_ needs to be treated especially when linking
3082 executables. Rather than setting it to the beginning of the TLS
3083 section, we have to set it to the end. This function may be called
3084 multiple times, it is idempotent. */
3085
3086static void
3087elf_i386_set_tls_module_base (struct bfd_link_info *info)
3088{
3089 struct elf_i386_link_hash_table *htab;
3090 struct bfd_link_hash_entry *base;
3091
3092 if (!info->executable)
3093 return;
3094
3095 htab = elf_i386_hash_table (info);
3096 if (htab == NULL)
3097 return;
3098
3099 base = htab->tls_module_base;
3100 if (base == NULL)
3101 return;
3102
3103 base->u.def.value = htab->elf.tls_size;
3104}
3105
3106/* Return the base VMA address which should be subtracted from real addresses
3107 when resolving @dtpoff relocation.
3108 This is PT_TLS segment p_vaddr. */
3109
3110static bfd_vma
3111elf_i386_dtpoff_base (struct bfd_link_info *info)
3112{
3113 /* If tls_sec is NULL, we should have signalled an error already. */
3114 if (elf_hash_table (info)->tls_sec == NULL)
3115 return 0;
3116 return elf_hash_table (info)->tls_sec->vma;
3117}
3118
3119/* Return the relocation value for @tpoff relocation
3120 if STT_TLS virtual address is ADDRESS. */
3121
3122static bfd_vma
3123elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3124{
3125 struct elf_link_hash_table *htab = elf_hash_table (info);
3126 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3127 bfd_vma static_tls_size;
3128
3129 /* If tls_sec is NULL, we should have signalled an error already. */
3130 if (htab->tls_sec == NULL)
3131 return 0;
3132
3133 /* Consider special static TLS alignment requirements. */
3134 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3135 return static_tls_size + htab->tls_sec->vma - address;
3136}
3137
3138/* Relocate an i386 ELF section. */
3139
3140static bfd_boolean
3141elf_i386_relocate_section (bfd *output_bfd,
3142 struct bfd_link_info *info,
3143 bfd *input_bfd,
3144 asection *input_section,
3145 bfd_byte *contents,
3146 Elf_Internal_Rela *relocs,
3147 Elf_Internal_Sym *local_syms,
3148 asection **local_sections)
3149{
3150 struct elf_i386_link_hash_table *htab;
3151 Elf_Internal_Shdr *symtab_hdr;
3152 struct elf_link_hash_entry **sym_hashes;
3153 bfd_vma *local_got_offsets;
3154 bfd_vma *local_tlsdesc_gotents;
3155 Elf_Internal_Rela *rel;
3156 Elf_Internal_Rela *relend;
3157 bfd_boolean is_vxworks_tls;
3158 unsigned plt_entry_size;
3159
3160 BFD_ASSERT (is_i386_elf (input_bfd));
3161
3162 htab = elf_i386_hash_table (info);
3163 if (htab == NULL)
3164 return FALSE;
3165 symtab_hdr = &elf_symtab_hdr (input_bfd);
3166 sym_hashes = elf_sym_hashes (input_bfd);
3167 local_got_offsets = elf_local_got_offsets (input_bfd);
3168 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3169 /* We have to handle relocations in vxworks .tls_vars sections
3170 specially, because the dynamic loader is 'weird'. */
3171 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3172 && info->shared
3173 && !strcmp (input_section->output_section->name,
3174 ".tls_vars"));
3175
3176 elf_i386_set_tls_module_base (info);
3177
3178 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3179
3180 rel = relocs;
3181 relend = relocs + input_section->reloc_count;
3182 for (; rel < relend; rel++)
3183 {
3184 unsigned int r_type;
3185 reloc_howto_type *howto;
3186 unsigned long r_symndx;
3187 struct elf_link_hash_entry *h;
3188 Elf_Internal_Sym *sym;
3189 asection *sec;
3190 bfd_vma off, offplt;
3191 bfd_vma relocation;
3192 bfd_boolean unresolved_reloc;
3193 bfd_reloc_status_type r;
3194 unsigned int indx;
3195 int tls_type;
3196 bfd_vma st_size;
3197
3198 r_type = ELF32_R_TYPE (rel->r_info);
3199 if (r_type == R_386_GNU_VTINHERIT
3200 || r_type == R_386_GNU_VTENTRY)
3201 continue;
3202
3203 if ((indx = r_type) >= R_386_standard
3204 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3205 >= R_386_ext - R_386_standard)
3206 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3207 >= R_386_irelative - R_386_ext))
3208 {
3209 (*_bfd_error_handler)
3210 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3211 input_bfd, input_section, r_type);
3212 bfd_set_error (bfd_error_bad_value);
3213 return FALSE;
3214 }
3215 howto = elf_howto_table + indx;
3216
3217 r_symndx = ELF32_R_SYM (rel->r_info);
3218 h = NULL;
3219 sym = NULL;
3220 sec = NULL;
3221 unresolved_reloc = FALSE;
3222 if (r_symndx < symtab_hdr->sh_info)
3223 {
3224 sym = local_syms + r_symndx;
3225 sec = local_sections[r_symndx];
3226 relocation = (sec->output_section->vma
3227 + sec->output_offset
3228 + sym->st_value);
3229 st_size = sym->st_size;
3230
3231 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3232 && ((sec->flags & SEC_MERGE) != 0
3233 || (info->relocatable
3234 && sec->output_offset != 0)))
3235 {
3236 bfd_vma addend;
3237 bfd_byte *where = contents + rel->r_offset;
3238
3239 switch (howto->size)
3240 {
3241 case 0:
3242 addend = bfd_get_8 (input_bfd, where);
3243 if (howto->pc_relative)
3244 {
3245 addend = (addend ^ 0x80) - 0x80;
3246 addend += 1;
3247 }
3248 break;
3249 case 1:
3250 addend = bfd_get_16 (input_bfd, where);
3251 if (howto->pc_relative)
3252 {
3253 addend = (addend ^ 0x8000) - 0x8000;
3254 addend += 2;
3255 }
3256 break;
3257 case 2:
3258 addend = bfd_get_32 (input_bfd, where);
3259 if (howto->pc_relative)
3260 {
3261 addend = (addend ^ 0x80000000) - 0x80000000;
3262 addend += 4;
3263 }
3264 break;
3265 default:
3266 abort ();
3267 }
3268
3269 if (info->relocatable)
3270 addend += sec->output_offset;
3271 else
3272 {
3273 asection *msec = sec;
3274 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3275 addend);
3276 addend -= relocation;
3277 addend += msec->output_section->vma + msec->output_offset;
3278 }
3279
3280 switch (howto->size)
3281 {
3282 case 0:
3283 /* FIXME: overflow checks. */
3284 if (howto->pc_relative)
3285 addend -= 1;
3286 bfd_put_8 (input_bfd, addend, where);
3287 break;
3288 case 1:
3289 if (howto->pc_relative)
3290 addend -= 2;
3291 bfd_put_16 (input_bfd, addend, where);
3292 break;
3293 case 2:
3294 if (howto->pc_relative)
3295 addend -= 4;
3296 bfd_put_32 (input_bfd, addend, where);
3297 break;
3298 }
3299 }
3300 else if (!info->relocatable
3301 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3302 {
3303 /* Relocate against local STT_GNU_IFUNC symbol. */
3304 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3305 FALSE);
3306 if (h == NULL)
3307 abort ();
3308
3309 /* Set STT_GNU_IFUNC symbol value. */
3310 h->root.u.def.value = sym->st_value;
3311 h->root.u.def.section = sec;
3312 }
3313 }
3314 else
3315 {
3316 bfd_boolean warned ATTRIBUTE_UNUSED;
3317 bfd_boolean ignored ATTRIBUTE_UNUSED;
3318
3319 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3320 r_symndx, symtab_hdr, sym_hashes,
3321 h, sec, relocation,
3322 unresolved_reloc, warned, ignored);
3323 st_size = h->size;
3324 }
3325
3326 if (sec != NULL && discarded_section (sec))
3327 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3328 rel, 1, relend, howto, 0, contents);
3329
3330 if (info->relocatable)
3331 continue;
3332
3333 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3334 it here if it is defined in a non-shared object. */
3335 if (h != NULL
3336 && h->type == STT_GNU_IFUNC
3337 && h->def_regular)
3338 {
3339 asection *plt, *gotplt, *base_got;
3340 bfd_vma plt_index;
3341 const char *name;
3342
3343 if ((input_section->flags & SEC_ALLOC) == 0
3344 || h->plt.offset == (bfd_vma) -1)
3345 abort ();
3346
3347 /* STT_GNU_IFUNC symbol must go through PLT. */
3348 if (htab->elf.splt != NULL)
3349 {
3350 plt = htab->elf.splt;
3351 gotplt = htab->elf.sgotplt;
3352 }
3353 else
3354 {
3355 plt = htab->elf.iplt;
3356 gotplt = htab->elf.igotplt;
3357 }
3358
3359 relocation = (plt->output_section->vma
3360 + plt->output_offset + h->plt.offset);
3361
3362 switch (r_type)
3363 {
3364 default:
3365 if (h->root.root.string)
3366 name = h->root.root.string;
3367 else
3368 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3369 NULL);
3370 (*_bfd_error_handler)
3371 (_("%B: relocation %s against STT_GNU_IFUNC "
3372 "symbol `%s' isn't handled by %s"), input_bfd,
3373 elf_howto_table[r_type].name,
3374 name, __FUNCTION__);
3375 bfd_set_error (bfd_error_bad_value);
3376 return FALSE;
3377
3378 case R_386_32:
3379 /* Generate dynamic relcoation only when there is a
3380 non-GOT reference in a shared object. */
3381 if (info->shared && h->non_got_ref)
3382 {
3383 Elf_Internal_Rela outrel;
3384 asection *sreloc;
3385 bfd_vma offset;
3386
3387 /* Need a dynamic relocation to get the real function
3388 adddress. */
3389 offset = _bfd_elf_section_offset (output_bfd,
3390 info,
3391 input_section,
3392 rel->r_offset);
3393 if (offset == (bfd_vma) -1
3394 || offset == (bfd_vma) -2)
3395 abort ();
3396
3397 outrel.r_offset = (input_section->output_section->vma
3398 + input_section->output_offset
3399 + offset);
3400
3401 if (h->dynindx == -1
3402 || h->forced_local
3403 || info->executable)
3404 {
3405 /* This symbol is resolved locally. */
3406 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3407 bfd_put_32 (output_bfd,
3408 (h->root.u.def.value
3409 + h->root.u.def.section->output_section->vma
3410 + h->root.u.def.section->output_offset),
3411 contents + offset);
3412 }
3413 else
3414 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3415
3416 sreloc = htab->elf.irelifunc;
3417 elf_append_rel (output_bfd, sreloc, &outrel);
3418
3419 /* If this reloc is against an external symbol, we
3420 do not want to fiddle with the addend. Otherwise,
3421 we need to include the symbol value so that it
3422 becomes an addend for the dynamic reloc. For an
3423 internal symbol, we have updated addend. */
3424 continue;
3425 }
3426 /* FALLTHROUGH */
3427 case R_386_PC32:
3428 case R_386_PLT32:
3429 goto do_relocation;
3430
3431 case R_386_GOT32:
3432 base_got = htab->elf.sgot;
3433 off = h->got.offset;
3434
3435 if (base_got == NULL)
3436 abort ();
3437
3438 if (off == (bfd_vma) -1)
3439 {
3440 /* We can't use h->got.offset here to save state, or
3441 even just remember the offset, as finish_dynamic_symbol
3442 would use that as offset into .got. */
3443
3444 if (htab->elf.splt != NULL)
3445 {
3446 plt_index = h->plt.offset / plt_entry_size - 1;
3447 off = (plt_index + 3) * 4;
3448 base_got = htab->elf.sgotplt;
3449 }
3450 else
3451 {
3452 plt_index = h->plt.offset / plt_entry_size;
3453 off = plt_index * 4;
3454 base_got = htab->elf.igotplt;
3455 }
3456
3457 if (h->dynindx == -1
3458 || h->forced_local
3459 || info->symbolic)
3460 {
3461 /* This references the local defitionion. We must
3462 initialize this entry in the global offset table.
3463 Since the offset must always be a multiple of 8,
3464 we use the least significant bit to record
3465 whether we have initialized it already.
3466
3467 When doing a dynamic link, we create a .rela.got
3468 relocation entry to initialize the value. This
3469 is done in the finish_dynamic_symbol routine. */
3470 if ((off & 1) != 0)
3471 off &= ~1;
3472 else
3473 {
3474 bfd_put_32 (output_bfd, relocation,
3475 base_got->contents + off);
3476 h->got.offset |= 1;
3477 }
3478 }
3479
3480 relocation = off;
3481
3482 /* Adjust for static executables. */
3483 if (htab->elf.splt == NULL)
3484 relocation += gotplt->output_offset;
3485 }
3486 else
3487 {
3488 relocation = (base_got->output_section->vma
3489 + base_got->output_offset + off
3490 - gotplt->output_section->vma
3491 - gotplt->output_offset);
3492 /* Adjust for static executables. */
3493 if (htab->elf.splt == NULL)
3494 relocation += gotplt->output_offset;
3495 }
3496
3497 goto do_relocation;
3498
3499 case R_386_GOTOFF:
3500 relocation -= (gotplt->output_section->vma
3501 + gotplt->output_offset);
3502 goto do_relocation;
3503 }
3504 }
3505
3506 switch (r_type)
3507 {
3508 case R_386_GOT32:
3509 /* Relocation is to the entry for this symbol in the global
3510 offset table. */
3511 if (htab->elf.sgot == NULL)
3512 abort ();
3513
3514 if (h != NULL)
3515 {
3516 bfd_boolean dyn;
3517
3518 off = h->got.offset;
3519 dyn = htab->elf.dynamic_sections_created;
3520 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3521 || (info->shared
3522 && SYMBOL_REFERENCES_LOCAL (info, h))
3523 || (ELF_ST_VISIBILITY (h->other)
3524 && h->root.type == bfd_link_hash_undefweak))
3525 {
3526 /* This is actually a static link, or it is a
3527 -Bsymbolic link and the symbol is defined
3528 locally, or the symbol was forced to be local
3529 because of a version file. We must initialize
3530 this entry in the global offset table. Since the
3531 offset must always be a multiple of 4, we use the
3532 least significant bit to record whether we have
3533 initialized it already.
3534
3535 When doing a dynamic link, we create a .rel.got
3536 relocation entry to initialize the value. This
3537 is done in the finish_dynamic_symbol routine. */
3538 if ((off & 1) != 0)
3539 off &= ~1;
3540 else
3541 {
3542 bfd_put_32 (output_bfd, relocation,
3543 htab->elf.sgot->contents + off);
3544 h->got.offset |= 1;
3545 }
3546 }
3547 else
3548 unresolved_reloc = FALSE;
3549 }
3550 else
3551 {
3552 if (local_got_offsets == NULL)
3553 abort ();
3554
3555 off = local_got_offsets[r_symndx];
3556
3557 /* The offset must always be a multiple of 4. We use
3558 the least significant bit to record whether we have
3559 already generated the necessary reloc. */
3560 if ((off & 1) != 0)
3561 off &= ~1;
3562 else
3563 {
3564 bfd_put_32 (output_bfd, relocation,
3565 htab->elf.sgot->contents + off);
3566
3567 if (info->shared)
3568 {
3569 asection *s;
3570 Elf_Internal_Rela outrel;
3571
3572 s = htab->elf.srelgot;
3573 if (s == NULL)
3574 abort ();
3575
3576 outrel.r_offset = (htab->elf.sgot->output_section->vma
3577 + htab->elf.sgot->output_offset
3578 + off);
3579 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3580 elf_append_rel (output_bfd, s, &outrel);
3581 }
3582
3583 local_got_offsets[r_symndx] |= 1;
3584 }
3585 }
3586
3587 if (off >= (bfd_vma) -2)
3588 abort ();
3589
3590 relocation = htab->elf.sgot->output_section->vma
3591 + htab->elf.sgot->output_offset + off
3592 - htab->elf.sgotplt->output_section->vma
3593 - htab->elf.sgotplt->output_offset;
3594 break;
3595
3596 case R_386_GOTOFF:
3597 /* Relocation is relative to the start of the global offset
3598 table. */
3599
3600 /* Check to make sure it isn't a protected function symbol
3601 for shared library since it may not be local when used
3602 as function address. We also need to make sure that a
3603 symbol is defined locally. */
3604 if (info->shared && h)
3605 {
3606 if (!h->def_regular)
3607 {
3608 const char *v;
3609
3610 switch (ELF_ST_VISIBILITY (h->other))
3611 {
3612 case STV_HIDDEN:
3613 v = _("hidden symbol");
3614 break;
3615 case STV_INTERNAL:
3616 v = _("internal symbol");
3617 break;
3618 case STV_PROTECTED:
3619 v = _("protected symbol");
3620 break;
3621 default:
3622 v = _("symbol");
3623 break;
3624 }
3625
3626 (*_bfd_error_handler)
3627 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3628 input_bfd, v, h->root.root.string);
3629 bfd_set_error (bfd_error_bad_value);
3630 return FALSE;
3631 }
3632 else if (!info->executable
3633 && !SYMBOLIC_BIND (info, h)
3634 && h->type == STT_FUNC
3635 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3636 {
3637 (*_bfd_error_handler)
3638 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3639 input_bfd, h->root.root.string);
3640 bfd_set_error (bfd_error_bad_value);
3641 return FALSE;
3642 }
3643 }
3644
3645 /* Note that sgot is not involved in this
3646 calculation. We always want the start of .got.plt. If we
3647 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3648 permitted by the ABI, we might have to change this
3649 calculation. */
3650 relocation -= htab->elf.sgotplt->output_section->vma
3651 + htab->elf.sgotplt->output_offset;
3652 break;
3653
3654 case R_386_GOTPC:
3655 /* Use global offset table as symbol value. */
3656 relocation = htab->elf.sgotplt->output_section->vma
3657 + htab->elf.sgotplt->output_offset;
3658 unresolved_reloc = FALSE;
3659 break;
3660
3661 case R_386_PLT32:
3662 /* Relocation is to the entry for this symbol in the
3663 procedure linkage table. */
3664
3665 /* Resolve a PLT32 reloc against a local symbol directly,
3666 without using the procedure linkage table. */
3667 if (h == NULL)
3668 break;
3669
3670 if (h->plt.offset == (bfd_vma) -1
3671 || htab->elf.splt == NULL)
3672 {
3673 /* We didn't make a PLT entry for this symbol. This
3674 happens when statically linking PIC code, or when
3675 using -Bsymbolic. */
3676 break;
3677 }
3678
3679 relocation = (htab->elf.splt->output_section->vma
3680 + htab->elf.splt->output_offset
3681 + h->plt.offset);
3682 unresolved_reloc = FALSE;
3683 break;
3684
3685 case R_386_SIZE32:
3686 /* Set to symbol size. */
3687 relocation = st_size;
3688 /* Fall through. */
3689
3690 case R_386_32:
3691 case R_386_PC32:
3692 if ((input_section->flags & SEC_ALLOC) == 0
3693 || is_vxworks_tls)
3694 break;
3695
3696 if ((info->shared
3697 && (h == NULL
3698 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3699 || h->root.type != bfd_link_hash_undefweak)
3700 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3701 || !SYMBOL_CALLS_LOCAL (info, h)))
3702 || (ELIMINATE_COPY_RELOCS
3703 && !info->shared
3704 && h != NULL
3705 && h->dynindx != -1
3706 && !h->non_got_ref
3707 && ((h->def_dynamic
3708 && !h->def_regular)
3709 || h->root.type == bfd_link_hash_undefweak
3710 || h->root.type == bfd_link_hash_undefined)))
3711 {
3712 Elf_Internal_Rela outrel;
3713 bfd_boolean skip, relocate;
3714 asection *sreloc;
3715
3716 /* When generating a shared object, these relocations
3717 are copied into the output file to be resolved at run
3718 time. */
3719
3720 skip = FALSE;
3721 relocate = FALSE;
3722
3723 outrel.r_offset =
3724 _bfd_elf_section_offset (output_bfd, info, input_section,
3725 rel->r_offset);
3726 if (outrel.r_offset == (bfd_vma) -1)
3727 skip = TRUE;
3728 else if (outrel.r_offset == (bfd_vma) -2)
3729 skip = TRUE, relocate = TRUE;
3730 outrel.r_offset += (input_section->output_section->vma
3731 + input_section->output_offset);
3732
3733 if (skip)
3734 memset (&outrel, 0, sizeof outrel);
3735 else if (h != NULL
3736 && h->dynindx != -1
3737 && (r_type == R_386_PC32
3738 || !info->shared
3739 || !SYMBOLIC_BIND (info, h)
3740 || !h->def_regular))
3741 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3742 else
3743 {
3744 /* This symbol is local, or marked to become local. */
3745 relocate = TRUE;
3746 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3747 }
3748
3749 sreloc = elf_section_data (input_section)->sreloc;
3750
3751 if (sreloc == NULL || sreloc->contents == NULL)
3752 {
3753 r = bfd_reloc_notsupported;
3754 goto check_relocation_error;
3755 }
3756
3757 elf_append_rel (output_bfd, sreloc, &outrel);
3758
3759 /* If this reloc is against an external symbol, we do
3760 not want to fiddle with the addend. Otherwise, we
3761 need to include the symbol value so that it becomes
3762 an addend for the dynamic reloc. */
3763 if (! relocate)
3764 continue;
3765 }
3766 break;
3767
3768 case R_386_TLS_IE:
3769 if (!info->executable)
3770 {
3771 Elf_Internal_Rela outrel;
3772 asection *sreloc;
3773
3774 outrel.r_offset = rel->r_offset
3775 + input_section->output_section->vma
3776 + input_section->output_offset;
3777 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3778 sreloc = elf_section_data (input_section)->sreloc;
3779 if (sreloc == NULL)
3780 abort ();
3781 elf_append_rel (output_bfd, sreloc, &outrel);
3782 }
3783 /* Fall through */
3784
3785 case R_386_TLS_GD:
3786 case R_386_TLS_GOTDESC:
3787 case R_386_TLS_DESC_CALL:
3788 case R_386_TLS_IE_32:
3789 case R_386_TLS_GOTIE:
3790 tls_type = GOT_UNKNOWN;
3791 if (h == NULL && local_got_offsets)
3792 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3793 else if (h != NULL)
3794 tls_type = elf_i386_hash_entry(h)->tls_type;
3795 if (tls_type == GOT_TLS_IE)
3796 tls_type = GOT_TLS_IE_NEG;
3797
3798 if (! elf_i386_tls_transition (info, input_bfd,
3799 input_section, contents,
3800 symtab_hdr, sym_hashes,
3801 &r_type, tls_type, rel,
3802 relend, h, r_symndx))
3803 return FALSE;
3804
3805 if (r_type == R_386_TLS_LE_32)
3806 {
3807 BFD_ASSERT (! unresolved_reloc);
3808 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3809 {
3810 unsigned int type;
3811 bfd_vma roff;
3812
3813 /* GD->LE transition. */
3814 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3815 if (type == 0x04)
3816 {
3817 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3818 Change it into:
3819 movl %gs:0, %eax; subl $foo@tpoff, %eax
3820 (6 byte form of subl). */
3821 memcpy (contents + rel->r_offset - 3,
3822 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3823 roff = rel->r_offset + 5;
3824 }
3825 else
3826 {
3827 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3828 Change it into:
3829 movl %gs:0, %eax; subl $foo@tpoff, %eax
3830 (6 byte form of subl). */
3831 memcpy (contents + rel->r_offset - 2,
3832 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3833 roff = rel->r_offset + 6;
3834 }
3835 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3836 contents + roff);
3837 /* Skip R_386_PC32/R_386_PLT32. */
3838 rel++;
3839 continue;
3840 }
3841 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3842 {
3843 /* GDesc -> LE transition.
3844 It's originally something like:
3845 leal x@tlsdesc(%ebx), %eax
3846
3847 leal x@ntpoff, %eax
3848
3849 Registers other than %eax may be set up here. */
3850
3851 unsigned int val;
3852 bfd_vma roff;
3853
3854 roff = rel->r_offset;
3855 val = bfd_get_8 (input_bfd, contents + roff - 1);
3856
3857 /* Now modify the instruction as appropriate. */
3858 /* aoliva FIXME: remove the above and xor the byte
3859 below with 0x86. */
3860 bfd_put_8 (output_bfd, val ^ 0x86,
3861 contents + roff - 1);
3862 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3863 contents + roff);
3864 continue;
3865 }
3866 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3867 {
3868 /* GDesc -> LE transition.
3869 It's originally:
3870 call *(%eax)
3871 Turn it into:
3872 xchg %ax,%ax */
3873
3874 bfd_vma roff;
3875
3876 roff = rel->r_offset;
3877 bfd_put_8 (output_bfd, 0x66, contents + roff);
3878 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3879 continue;
3880 }
3881 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3882 {
3883 unsigned int val;
3884
3885 /* IE->LE transition:
3886 Originally it can be one of:
3887 movl foo, %eax
3888 movl foo, %reg
3889 addl foo, %reg
3890 We change it into:
3891 movl $foo, %eax
3892 movl $foo, %reg
3893 addl $foo, %reg. */
3894 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3895 if (val == 0xa1)
3896 {
3897 /* movl foo, %eax. */
3898 bfd_put_8 (output_bfd, 0xb8,
3899 contents + rel->r_offset - 1);
3900 }
3901 else
3902 {
3903 unsigned int type;
3904
3905 type = bfd_get_8 (input_bfd,
3906 contents + rel->r_offset - 2);
3907 switch (type)
3908 {
3909 case 0x8b:
3910 /* movl */
3911 bfd_put_8 (output_bfd, 0xc7,
3912 contents + rel->r_offset - 2);
3913 bfd_put_8 (output_bfd,
3914 0xc0 | ((val >> 3) & 7),
3915 contents + rel->r_offset - 1);
3916 break;
3917 case 0x03:
3918 /* addl */
3919 bfd_put_8 (output_bfd, 0x81,
3920 contents + rel->r_offset - 2);
3921 bfd_put_8 (output_bfd,
3922 0xc0 | ((val >> 3) & 7),
3923 contents + rel->r_offset - 1);
3924 break;
3925 default:
3926 BFD_FAIL ();
3927 break;
3928 }
3929 }
3930 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3931 contents + rel->r_offset);
3932 continue;
3933 }
3934 else
3935 {
3936 unsigned int val, type;
3937
3938 /* {IE_32,GOTIE}->LE transition:
3939 Originally it can be one of:
3940 subl foo(%reg1), %reg2
3941 movl foo(%reg1), %reg2
3942 addl foo(%reg1), %reg2
3943 We change it into:
3944 subl $foo, %reg2
3945 movl $foo, %reg2 (6 byte form)
3946 addl $foo, %reg2. */
3947 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3948 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3949 if (type == 0x8b)
3950 {
3951 /* movl */
3952 bfd_put_8 (output_bfd, 0xc7,
3953 contents + rel->r_offset - 2);
3954 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3955 contents + rel->r_offset - 1);
3956 }
3957 else if (type == 0x2b)
3958 {
3959 /* subl */
3960 bfd_put_8 (output_bfd, 0x81,
3961 contents + rel->r_offset - 2);
3962 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3963 contents + rel->r_offset - 1);
3964 }
3965 else if (type == 0x03)
3966 {
3967 /* addl */
3968 bfd_put_8 (output_bfd, 0x81,
3969 contents + rel->r_offset - 2);
3970 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3971 contents + rel->r_offset - 1);
3972 }
3973 else
3974 BFD_FAIL ();
3975 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3976 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3977 contents + rel->r_offset);
3978 else
3979 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3980 contents + rel->r_offset);
3981 continue;
3982 }
3983 }
3984
3985 if (htab->elf.sgot == NULL)
3986 abort ();
3987
3988 if (h != NULL)
3989 {
3990 off = h->got.offset;
3991 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3992 }
3993 else
3994 {
3995 if (local_got_offsets == NULL)
3996 abort ();
3997
3998 off = local_got_offsets[r_symndx];
3999 offplt = local_tlsdesc_gotents[r_symndx];
4000 }
4001
4002 if ((off & 1) != 0)
4003 off &= ~1;
4004 else
4005 {
4006 Elf_Internal_Rela outrel;
4007 int dr_type;
4008 asection *sreloc;
4009
4010 if (htab->elf.srelgot == NULL)
4011 abort ();
4012
4013 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4014
4015 if (GOT_TLS_GDESC_P (tls_type))
4016 {
4017 bfd_byte *loc;
4018 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4019 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4020 <= htab->elf.sgotplt->size);
4021 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4022 + htab->elf.sgotplt->output_offset
4023 + offplt
4024 + htab->sgotplt_jump_table_size);
4025 sreloc = htab->elf.srelplt;
4026 loc = sreloc->contents;
4027 loc += (htab->next_tls_desc_index++
4028 * sizeof (Elf32_External_Rel));
4029 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4030 <= sreloc->contents + sreloc->size);
4031 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4032 if (indx == 0)
4033 {
4034 BFD_ASSERT (! unresolved_reloc);
4035 bfd_put_32 (output_bfd,
4036 relocation - elf_i386_dtpoff_base (info),
4037 htab->elf.sgotplt->contents + offplt
4038 + htab->sgotplt_jump_table_size + 4);
4039 }
4040 else
4041 {
4042 bfd_put_32 (output_bfd, 0,
4043 htab->elf.sgotplt->contents + offplt
4044 + htab->sgotplt_jump_table_size + 4);
4045 }
4046 }
4047
4048 sreloc = htab->elf.srelgot;
4049
4050 outrel.r_offset = (htab->elf.sgot->output_section->vma
4051 + htab->elf.sgot->output_offset + off);
4052
4053 if (GOT_TLS_GD_P (tls_type))
4054 dr_type = R_386_TLS_DTPMOD32;
4055 else if (GOT_TLS_GDESC_P (tls_type))
4056 goto dr_done;
4057 else if (tls_type == GOT_TLS_IE_POS)
4058 dr_type = R_386_TLS_TPOFF;
4059 else
4060 dr_type = R_386_TLS_TPOFF32;
4061
4062 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4063 bfd_put_32 (output_bfd,
4064 relocation - elf_i386_dtpoff_base (info),
4065 htab->elf.sgot->contents + off);
4066 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4067 bfd_put_32 (output_bfd,
4068 elf_i386_dtpoff_base (info) - relocation,
4069 htab->elf.sgot->contents + off);
4070 else if (dr_type != R_386_TLS_DESC)
4071 bfd_put_32 (output_bfd, 0,
4072 htab->elf.sgot->contents + off);
4073 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4074
4075 elf_append_rel (output_bfd, sreloc, &outrel);
4076
4077 if (GOT_TLS_GD_P (tls_type))
4078 {
4079 if (indx == 0)
4080 {
4081 BFD_ASSERT (! unresolved_reloc);
4082 bfd_put_32 (output_bfd,
4083 relocation - elf_i386_dtpoff_base (info),
4084 htab->elf.sgot->contents + off + 4);
4085 }
4086 else
4087 {
4088 bfd_put_32 (output_bfd, 0,
4089 htab->elf.sgot->contents + off + 4);
4090 outrel.r_info = ELF32_R_INFO (indx,
4091 R_386_TLS_DTPOFF32);
4092 outrel.r_offset += 4;
4093 elf_append_rel (output_bfd, sreloc, &outrel);
4094 }
4095 }
4096 else if (tls_type == GOT_TLS_IE_BOTH)
4097 {
4098 bfd_put_32 (output_bfd,
4099 (indx == 0
4100 ? relocation - elf_i386_dtpoff_base (info)
4101 : 0),
4102 htab->elf.sgot->contents + off + 4);
4103 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4104 outrel.r_offset += 4;
4105 elf_append_rel (output_bfd, sreloc, &outrel);
4106 }
4107
4108 dr_done:
4109 if (h != NULL)
4110 h->got.offset |= 1;
4111 else
4112 local_got_offsets[r_symndx] |= 1;
4113 }
4114
4115 if (off >= (bfd_vma) -2
4116 && ! GOT_TLS_GDESC_P (tls_type))
4117 abort ();
4118 if (r_type == R_386_TLS_GOTDESC
4119 || r_type == R_386_TLS_DESC_CALL)
4120 {
4121 relocation = htab->sgotplt_jump_table_size + offplt;
4122 unresolved_reloc = FALSE;
4123 }
4124 else if (r_type == ELF32_R_TYPE (rel->r_info))
4125 {
4126 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4127 + htab->elf.sgotplt->output_offset;
4128 relocation = htab->elf.sgot->output_section->vma
4129 + htab->elf.sgot->output_offset + off - g_o_t;
4130 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4131 && tls_type == GOT_TLS_IE_BOTH)
4132 relocation += 4;
4133 if (r_type == R_386_TLS_IE)
4134 relocation += g_o_t;
4135 unresolved_reloc = FALSE;
4136 }
4137 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4138 {
4139 unsigned int val, type;
4140 bfd_vma roff;
4141
4142 /* GD->IE transition. */
4143 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4144 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4145 if (type == 0x04)
4146 {
4147 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4148 Change it into:
4149 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4150 val >>= 3;
4151 roff = rel->r_offset - 3;
4152 }
4153 else
4154 {
4155 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4156 Change it into:
4157 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4158 roff = rel->r_offset - 2;
4159 }
4160 memcpy (contents + roff,
4161 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4162 contents[roff + 7] = 0x80 | (val & 7);
4163 /* If foo is used only with foo@gotntpoff(%reg) and
4164 foo@indntpoff, but not with foo@gottpoff(%reg), change
4165 subl $foo@gottpoff(%reg), %eax
4166 into:
4167 addl $foo@gotntpoff(%reg), %eax. */
4168 if (tls_type == GOT_TLS_IE_POS)
4169 contents[roff + 6] = 0x03;
4170 bfd_put_32 (output_bfd,
4171 htab->elf.sgot->output_section->vma
4172 + htab->elf.sgot->output_offset + off
4173 - htab->elf.sgotplt->output_section->vma
4174 - htab->elf.sgotplt->output_offset,
4175 contents + roff + 8);
4176 /* Skip R_386_PLT32. */
4177 rel++;
4178 continue;
4179 }
4180 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4181 {
4182 /* GDesc -> IE transition.
4183 It's originally something like:
4184 leal x@tlsdesc(%ebx), %eax
4185
4186 Change it to:
4187 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4188 or:
4189 movl x@gottpoff(%ebx), %eax # before negl %eax
4190
4191 Registers other than %eax may be set up here. */
4192
4193 bfd_vma roff;
4194
4195 /* First, make sure it's a leal adding ebx to a 32-bit
4196 offset into any register, although it's probably
4197 almost always going to be eax. */
4198 roff = rel->r_offset;
4199
4200 /* Now modify the instruction as appropriate. */
4201 /* To turn a leal into a movl in the form we use it, it
4202 suffices to change the first byte from 0x8d to 0x8b.
4203 aoliva FIXME: should we decide to keep the leal, all
4204 we have to do is remove the statement below, and
4205 adjust the relaxation of R_386_TLS_DESC_CALL. */
4206 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4207
4208 if (tls_type == GOT_TLS_IE_BOTH)
4209 off += 4;
4210
4211 bfd_put_32 (output_bfd,
4212 htab->elf.sgot->output_section->vma
4213 + htab->elf.sgot->output_offset + off
4214 - htab->elf.sgotplt->output_section->vma
4215 - htab->elf.sgotplt->output_offset,
4216 contents + roff);
4217 continue;
4218 }
4219 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4220 {
4221 /* GDesc -> IE transition.
4222 It's originally:
4223 call *(%eax)
4224
4225 Change it to:
4226 xchg %ax,%ax
4227 or
4228 negl %eax
4229 depending on how we transformed the TLS_GOTDESC above.
4230 */
4231
4232 bfd_vma roff;
4233
4234 roff = rel->r_offset;
4235
4236 /* Now modify the instruction as appropriate. */
4237 if (tls_type != GOT_TLS_IE_NEG)
4238 {
4239 /* xchg %ax,%ax */
4240 bfd_put_8 (output_bfd, 0x66, contents + roff);
4241 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4242 }
4243 else
4244 {
4245 /* negl %eax */
4246 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4247 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4248 }
4249
4250 continue;
4251 }
4252 else
4253 BFD_ASSERT (FALSE);
4254 break;
4255
4256 case R_386_TLS_LDM:
4257 if (! elf_i386_tls_transition (info, input_bfd,
4258 input_section, contents,
4259 symtab_hdr, sym_hashes,
4260 &r_type, GOT_UNKNOWN, rel,
4261 relend, h, r_symndx))
4262 return FALSE;
4263
4264 if (r_type != R_386_TLS_LDM)
4265 {
4266 /* LD->LE transition:
4267 leal foo(%reg), %eax; call ___tls_get_addr.
4268 We change it into:
4269 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4270 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4271 memcpy (contents + rel->r_offset - 2,
4272 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4273 /* Skip R_386_PC32/R_386_PLT32. */
4274 rel++;
4275 continue;
4276 }
4277
4278 if (htab->elf.sgot == NULL)
4279 abort ();
4280
4281 off = htab->tls_ldm_got.offset;
4282 if (off & 1)
4283 off &= ~1;
4284 else
4285 {
4286 Elf_Internal_Rela outrel;
4287
4288 if (htab->elf.srelgot == NULL)
4289 abort ();
4290
4291 outrel.r_offset = (htab->elf.sgot->output_section->vma
4292 + htab->elf.sgot->output_offset + off);
4293
4294 bfd_put_32 (output_bfd, 0,
4295 htab->elf.sgot->contents + off);
4296 bfd_put_32 (output_bfd, 0,
4297 htab->elf.sgot->contents + off + 4);
4298 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4299 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4300 htab->tls_ldm_got.offset |= 1;
4301 }
4302 relocation = htab->elf.sgot->output_section->vma
4303 + htab->elf.sgot->output_offset + off
4304 - htab->elf.sgotplt->output_section->vma
4305 - htab->elf.sgotplt->output_offset;
4306 unresolved_reloc = FALSE;
4307 break;
4308
4309 case R_386_TLS_LDO_32:
4310 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4311 relocation -= elf_i386_dtpoff_base (info);
4312 else
4313 /* When converting LDO to LE, we must negate. */
4314 relocation = -elf_i386_tpoff (info, relocation);
4315 break;
4316
4317 case R_386_TLS_LE_32:
4318 case R_386_TLS_LE:
4319 if (!info->executable)
4320 {
4321 Elf_Internal_Rela outrel;
4322 asection *sreloc;
4323
4324 outrel.r_offset = rel->r_offset
4325 + input_section->output_section->vma
4326 + input_section->output_offset;
4327 if (h != NULL && h->dynindx != -1)
4328 indx = h->dynindx;
4329 else
4330 indx = 0;
4331 if (r_type == R_386_TLS_LE_32)
4332 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4333 else
4334 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4335 sreloc = elf_section_data (input_section)->sreloc;
4336 if (sreloc == NULL)
4337 abort ();
4338 elf_append_rel (output_bfd, sreloc, &outrel);
4339 if (indx)
4340 continue;
4341 else if (r_type == R_386_TLS_LE_32)
4342 relocation = elf_i386_dtpoff_base (info) - relocation;
4343 else
4344 relocation -= elf_i386_dtpoff_base (info);
4345 }
4346 else if (r_type == R_386_TLS_LE_32)
4347 relocation = elf_i386_tpoff (info, relocation);
4348 else
4349 relocation = -elf_i386_tpoff (info, relocation);
4350 break;
4351
4352 default:
4353 break;
4354 }
4355
4356 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4357 because such sections are not SEC_ALLOC and thus ld.so will
4358 not process them. */
4359 if (unresolved_reloc
4360 && !((input_section->flags & SEC_DEBUGGING) != 0
4361 && h->def_dynamic)
4362 && _bfd_elf_section_offset (output_bfd, info, input_section,
4363 rel->r_offset) != (bfd_vma) -1)
4364 {
4365 (*_bfd_error_handler)
4366 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4367 input_bfd,
4368 input_section,
4369 (long) rel->r_offset,
4370 howto->name,
4371 h->root.root.string);
4372 return FALSE;
4373 }
4374
4375do_relocation:
4376 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4377 contents, rel->r_offset,
4378 relocation, 0);
4379
4380check_relocation_error:
4381 if (r != bfd_reloc_ok)
4382 {
4383 const char *name;
4384
4385 if (h != NULL)
4386 name = h->root.root.string;
4387 else
4388 {
4389 name = bfd_elf_string_from_elf_section (input_bfd,
4390 symtab_hdr->sh_link,
4391 sym->st_name);
4392 if (name == NULL)
4393 return FALSE;
4394 if (*name == '\0')
4395 name = bfd_section_name (input_bfd, sec);
4396 }
4397
4398 if (r == bfd_reloc_overflow)
4399 {
4400 if (! ((*info->callbacks->reloc_overflow)
4401 (info, (h ? &h->root : NULL), name, howto->name,
4402 (bfd_vma) 0, input_bfd, input_section,
4403 rel->r_offset)))
4404 return FALSE;
4405 }
4406 else
4407 {
4408 (*_bfd_error_handler)
4409 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4410 input_bfd, input_section,
4411 (long) rel->r_offset, name, (int) r);
4412 return FALSE;
4413 }
4414 }
4415 }
4416
4417 return TRUE;
4418}
4419
4420/* Finish up dynamic symbol handling. We set the contents of various
4421 dynamic sections here. */
4422
4423static bfd_boolean
4424elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4425 struct bfd_link_info *info,
4426 struct elf_link_hash_entry *h,
4427 Elf_Internal_Sym *sym)
4428{
4429 struct elf_i386_link_hash_table *htab;
4430 unsigned plt_entry_size;
4431 const struct elf_i386_backend_data *abed;
4432
4433 htab = elf_i386_hash_table (info);
4434 if (htab == NULL)
4435 return FALSE;
4436
4437 abed = get_elf_i386_backend_data (output_bfd);
4438 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4439
4440 if (h->plt.offset != (bfd_vma) -1)
4441 {
4442 bfd_vma plt_index;
4443 bfd_vma got_offset;
4444 Elf_Internal_Rela rel;
4445 bfd_byte *loc;
4446 asection *plt, *gotplt, *relplt;
4447
4448 /* When building a static executable, use .iplt, .igot.plt and
4449 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4450 if (htab->elf.splt != NULL)
4451 {
4452 plt = htab->elf.splt;
4453 gotplt = htab->elf.sgotplt;
4454 relplt = htab->elf.srelplt;
4455 }
4456 else
4457 {
4458 plt = htab->elf.iplt;
4459 gotplt = htab->elf.igotplt;
4460 relplt = htab->elf.irelplt;
4461 }
4462
4463 /* This symbol has an entry in the procedure linkage table. Set
4464 it up. */
4465
4466 if ((h->dynindx == -1
4467 && !((h->forced_local || info->executable)
4468 && h->def_regular
4469 && h->type == STT_GNU_IFUNC))
4470 || plt == NULL
4471 || gotplt == NULL
4472 || relplt == NULL)
4473 abort ();
4474
4475 /* Get the index in the procedure linkage table which
4476 corresponds to this symbol. This is the index of this symbol
4477 in all the symbols for which we are making plt entries. The
4478 first entry in the procedure linkage table is reserved.
4479
4480 Get the offset into the .got table of the entry that
4481 corresponds to this function. Each .got entry is 4 bytes.
4482 The first three are reserved.
4483
4484 For static executables, we don't reserve anything. */
4485
4486 if (plt == htab->elf.splt)
4487 {
4488 got_offset = h->plt.offset / plt_entry_size - 1;
4489 got_offset = (got_offset + 3) * 4;
4490 }
4491 else
4492 {
4493 got_offset = h->plt.offset / plt_entry_size;
4494 got_offset = got_offset * 4;
4495 }
4496
4497 /* Fill in the entry in the procedure linkage table. */
4498 if (! info->shared)
4499 {
4500 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4501 abed->plt->plt_entry_size);
4502 bfd_put_32 (output_bfd,
4503 (gotplt->output_section->vma
4504 + gotplt->output_offset
4505 + got_offset),
4506 plt->contents + h->plt.offset
4507 + abed->plt->plt_got_offset);
4508
4509 if (abed->is_vxworks)
4510 {
4511 int s, k, reloc_index;
4512
4513 /* Create the R_386_32 relocation referencing the GOT
4514 for this PLT entry. */
4515
4516 /* S: Current slot number (zero-based). */
4517 s = ((h->plt.offset - abed->plt->plt_entry_size)
4518 / abed->plt->plt_entry_size);
4519 /* K: Number of relocations for PLTResolve. */
4520 if (info->shared)
4521 k = PLTRESOLVE_RELOCS_SHLIB;
4522 else
4523 k = PLTRESOLVE_RELOCS;
4524 /* Skip the PLTresolve relocations, and the relocations for
4525 the other PLT slots. */
4526 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4527 loc = (htab->srelplt2->contents + reloc_index
4528 * sizeof (Elf32_External_Rel));
4529
4530 rel.r_offset = (htab->elf.splt->output_section->vma
4531 + htab->elf.splt->output_offset
4532 + h->plt.offset + 2),
4533 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4534 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4535
4536 /* Create the R_386_32 relocation referencing the beginning of
4537 the PLT for this GOT entry. */
4538 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4539 + htab->elf.sgotplt->output_offset
4540 + got_offset);
4541 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4542 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4543 loc + sizeof (Elf32_External_Rel));
4544 }
4545 }
4546 else
4547 {
4548 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4549 abed->plt->plt_entry_size);
4550 bfd_put_32 (output_bfd, got_offset,
4551 plt->contents + h->plt.offset
4552 + abed->plt->plt_got_offset);
4553 }
4554
4555 /* Fill in the entry in the global offset table. */
4556 bfd_put_32 (output_bfd,
4557 (plt->output_section->vma
4558 + plt->output_offset
4559 + h->plt.offset
4560 + abed->plt->plt_lazy_offset),
4561 gotplt->contents + got_offset);
4562
4563 /* Fill in the entry in the .rel.plt section. */
4564 rel.r_offset = (gotplt->output_section->vma
4565 + gotplt->output_offset
4566 + got_offset);
4567 if (h->dynindx == -1
4568 || ((info->executable
4569 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4570 && h->def_regular
4571 && h->type == STT_GNU_IFUNC))
4572 {
4573 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4574 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4575 in the .got.plt section. */
4576 bfd_put_32 (output_bfd,
4577 (h->root.u.def.value
4578 + h->root.u.def.section->output_section->vma
4579 + h->root.u.def.section->output_offset),
4580 gotplt->contents + got_offset);
4581 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4582 /* R_386_IRELATIVE comes last. */
4583 plt_index = htab->next_irelative_index--;
4584 }
4585 else
4586 {
4587 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4588 plt_index = htab->next_jump_slot_index++;
4589 }
4590 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4591 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4592
4593 /* Don't fill PLT entry for static executables. */
4594 if (plt == htab->elf.splt)
4595 {
4596 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4597 plt->contents + h->plt.offset
4598 + abed->plt->plt_reloc_offset);
4599 bfd_put_32 (output_bfd, - (h->plt.offset
4600 + abed->plt->plt_plt_offset + 4),
4601 plt->contents + h->plt.offset
4602 + abed->plt->plt_plt_offset);
4603 }
4604
4605 if (!h->def_regular)
4606 {
4607 /* Mark the symbol as undefined, rather than as defined in
4608 the .plt section. Leave the value if there were any
4609 relocations where pointer equality matters (this is a clue
4610 for the dynamic linker, to make function pointer
4611 comparisons work between an application and shared
4612 library), otherwise set it to zero. If a function is only
4613 called from a binary, there is no need to slow down
4614 shared libraries because of that. */
4615 sym->st_shndx = SHN_UNDEF;
4616 if (!h->pointer_equality_needed)
4617 sym->st_value = 0;
4618 }
4619 }
4620
4621 if (h->got.offset != (bfd_vma) -1
4622 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4623 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4624 {
4625 Elf_Internal_Rela rel;
4626
4627 /* This symbol has an entry in the global offset table. Set it
4628 up. */
4629
4630 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4631 abort ();
4632
4633 rel.r_offset = (htab->elf.sgot->output_section->vma
4634 + htab->elf.sgot->output_offset
4635 + (h->got.offset & ~(bfd_vma) 1));
4636
4637 /* If this is a static link, or it is a -Bsymbolic link and the
4638 symbol is defined locally or was forced to be local because
4639 of a version file, we just want to emit a RELATIVE reloc.
4640 The entry in the global offset table will already have been
4641 initialized in the relocate_section function. */
4642 if (h->def_regular
4643 && h->type == STT_GNU_IFUNC)
4644 {
4645 if (info->shared)
4646 {
4647 /* Generate R_386_GLOB_DAT. */
4648 goto do_glob_dat;
4649 }
4650 else
4651 {
4652 asection *plt;
4653
4654 if (!h->pointer_equality_needed)
4655 abort ();
4656
4657 /* For non-shared object, we can't use .got.plt, which
4658 contains the real function addres if we need pointer
4659 equality. We load the GOT entry with the PLT entry. */
4660 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4661 bfd_put_32 (output_bfd,
4662 (plt->output_section->vma
4663 + plt->output_offset + h->plt.offset),
4664 htab->elf.sgot->contents + h->got.offset);
4665 return TRUE;
4666 }
4667 }
4668 else if (info->shared
4669 && SYMBOL_REFERENCES_LOCAL (info, h))
4670 {
4671 BFD_ASSERT((h->got.offset & 1) != 0);
4672 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4673 }
4674 else
4675 {
4676 BFD_ASSERT((h->got.offset & 1) == 0);
4677do_glob_dat:
4678 bfd_put_32 (output_bfd, (bfd_vma) 0,
4679 htab->elf.sgot->contents + h->got.offset);
4680 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4681 }
4682
4683 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4684 }
4685
4686 if (h->needs_copy)
4687 {
4688 Elf_Internal_Rela rel;
4689
4690 /* This symbol needs a copy reloc. Set it up. */
4691
4692 if (h->dynindx == -1
4693 || (h->root.type != bfd_link_hash_defined
4694 && h->root.type != bfd_link_hash_defweak)
4695 || htab->srelbss == NULL)
4696 abort ();
4697
4698 rel.r_offset = (h->root.u.def.value
4699 + h->root.u.def.section->output_section->vma
4700 + h->root.u.def.section->output_offset);
4701 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4702 elf_append_rel (output_bfd, htab->srelbss, &rel);
4703 }
4704
4705 return TRUE;
4706}
4707
4708/* Finish up local dynamic symbol handling. We set the contents of
4709 various dynamic sections here. */
4710
4711static bfd_boolean
4712elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4713{
4714 struct elf_link_hash_entry *h
4715 = (struct elf_link_hash_entry *) *slot;
4716 struct bfd_link_info *info
4717 = (struct bfd_link_info *) inf;
4718
4719 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4720 h, NULL);
4721}
4722
4723/* Used to decide how to sort relocs in an optimal manner for the
4724 dynamic linker, before writing them out. */
4725
4726static enum elf_reloc_type_class
4727elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4728 const asection *rel_sec ATTRIBUTE_UNUSED,
4729 const Elf_Internal_Rela *rela)
4730{
4731 switch (ELF32_R_TYPE (rela->r_info))
4732 {
4733 case R_386_RELATIVE:
4734 return reloc_class_relative;
4735 case R_386_JUMP_SLOT:
4736 return reloc_class_plt;
4737 case R_386_COPY:
4738 return reloc_class_copy;
4739 default:
4740 return reloc_class_normal;
4741 }
4742}
4743
4744/* Finish up the dynamic sections. */
4745
4746static bfd_boolean
4747elf_i386_finish_dynamic_sections (bfd *output_bfd,
4748 struct bfd_link_info *info)
4749{
4750 struct elf_i386_link_hash_table *htab;
4751 bfd *dynobj;
4752 asection *sdyn;
4753 const struct elf_i386_backend_data *abed;
4754
4755 htab = elf_i386_hash_table (info);
4756 if (htab == NULL)
4757 return FALSE;
4758
4759 dynobj = htab->elf.dynobj;
4760 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4761 abed = get_elf_i386_backend_data (output_bfd);
4762
4763 if (htab->elf.dynamic_sections_created)
4764 {
4765 Elf32_External_Dyn *dyncon, *dynconend;
4766
4767 if (sdyn == NULL || htab->elf.sgot == NULL)
4768 abort ();
4769
4770 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4771 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4772 for (; dyncon < dynconend; dyncon++)
4773 {
4774 Elf_Internal_Dyn dyn;
4775 asection *s;
4776
4777 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4778
4779 switch (dyn.d_tag)
4780 {
4781 default:
4782 if (abed->is_vxworks
4783 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4784 break;
4785 continue;
4786
4787 case DT_PLTGOT:
4788 s = htab->elf.sgotplt;
4789 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4790 break;
4791
4792 case DT_JMPREL:
4793 s = htab->elf.srelplt;
4794 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4795 break;
4796
4797 case DT_PLTRELSZ:
4798 s = htab->elf.srelplt;
4799 dyn.d_un.d_val = s->size;
4800 break;
4801
4802 case DT_RELSZ:
4803 /* My reading of the SVR4 ABI indicates that the
4804 procedure linkage table relocs (DT_JMPREL) should be
4805 included in the overall relocs (DT_REL). This is
4806 what Solaris does. However, UnixWare can not handle
4807 that case. Therefore, we override the DT_RELSZ entry
4808 here to make it not include the JMPREL relocs. */
4809 s = htab->elf.srelplt;
4810 if (s == NULL)
4811 continue;
4812 dyn.d_un.d_val -= s->size;
4813 break;
4814
4815 case DT_REL:
4816 /* We may not be using the standard ELF linker script.
4817 If .rel.plt is the first .rel section, we adjust
4818 DT_REL to not include it. */
4819 s = htab->elf.srelplt;
4820 if (s == NULL)
4821 continue;
4822 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4823 continue;
4824 dyn.d_un.d_ptr += s->size;
4825 break;
4826 }
4827
4828 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4829 }
4830
4831 /* Fill in the first entry in the procedure linkage table. */
4832 if (htab->elf.splt && htab->elf.splt->size > 0)
4833 {
4834 if (info->shared)
4835 {
4836 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4837 abed->plt->plt0_entry_size);
4838 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4839 abed->plt0_pad_byte,
4840 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4841 }
4842 else
4843 {
4844 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4845 abed->plt->plt0_entry_size);
4846 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4847 abed->plt0_pad_byte,
4848 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4849 bfd_put_32 (output_bfd,
4850 (htab->elf.sgotplt->output_section->vma
4851 + htab->elf.sgotplt->output_offset
4852 + 4),
4853 htab->elf.splt->contents
4854 + abed->plt->plt0_got1_offset);
4855 bfd_put_32 (output_bfd,
4856 (htab->elf.sgotplt->output_section->vma
4857 + htab->elf.sgotplt->output_offset
4858 + 8),
4859 htab->elf.splt->contents
4860 + abed->plt->plt0_got2_offset);
4861
4862 if (abed->is_vxworks)
4863 {
4864 Elf_Internal_Rela rel;
4865
4866 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4867 On IA32 we use REL relocations so the addend goes in
4868 the PLT directly. */
4869 rel.r_offset = (htab->elf.splt->output_section->vma
4870 + htab->elf.splt->output_offset
4871 + abed->plt->plt0_got1_offset);
4872 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4873 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4874 htab->srelplt2->contents);
4875 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4876 rel.r_offset = (htab->elf.splt->output_section->vma
4877 + htab->elf.splt->output_offset
4878 + abed->plt->plt0_got2_offset);
4879 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4880 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4881 htab->srelplt2->contents +
4882 sizeof (Elf32_External_Rel));
4883 }
4884 }
4885
4886 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4887 really seem like the right value. */
4888 elf_section_data (htab->elf.splt->output_section)
4889 ->this_hdr.sh_entsize = 4;
4890
4891 /* Correct the .rel.plt.unloaded relocations. */
4892 if (abed->is_vxworks && !info->shared)
4893 {
4894 int num_plts = (htab->elf.splt->size
4895 / abed->plt->plt_entry_size) - 1;
4896 unsigned char *p;
4897
4898 p = htab->srelplt2->contents;
4899 if (info->shared)
4900 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4901 else
4902 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4903
4904 for (; num_plts; num_plts--)
4905 {
4906 Elf_Internal_Rela rel;
4907 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4908 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4909 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4910 p += sizeof (Elf32_External_Rel);
4911
4912 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4913 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4914 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4915 p += sizeof (Elf32_External_Rel);
4916 }
4917 }
4918 }
4919 }
4920
4921 if (htab->elf.sgotplt)
4922 {
4923 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4924 {
4925 (*_bfd_error_handler)
4926 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4927 return FALSE;
4928 }
4929
4930 /* Fill in the first three entries in the global offset table. */
4931 if (htab->elf.sgotplt->size > 0)
4932 {
4933 bfd_put_32 (output_bfd,
4934 (sdyn == NULL ? 0
4935 : sdyn->output_section->vma + sdyn->output_offset),
4936 htab->elf.sgotplt->contents);
4937 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4938 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4939 }
4940
4941 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4942 }
4943
4944 /* Adjust .eh_frame for .plt section. */
4945 if (htab->plt_eh_frame != NULL
4946 && htab->plt_eh_frame->contents != NULL)
4947 {
4948 if (htab->elf.splt != NULL
4949 && htab->elf.splt->size != 0
4950 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4951 && htab->elf.splt->output_section != NULL
4952 && htab->plt_eh_frame->output_section != NULL)
4953 {
4954 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4955 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4956 + htab->plt_eh_frame->output_offset
4957 + PLT_FDE_START_OFFSET;
4958 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4959 htab->plt_eh_frame->contents
4960 + PLT_FDE_START_OFFSET);
4961 }
4962 if (htab->plt_eh_frame->sec_info_type
4963 == SEC_INFO_TYPE_EH_FRAME)
4964 {
4965 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4966 htab->plt_eh_frame,
4967 htab->plt_eh_frame->contents))
4968 return FALSE;
4969 }
4970 }
4971
4972 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4973 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4974
4975 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4976 htab_traverse (htab->loc_hash_table,
4977 elf_i386_finish_local_dynamic_symbol,
4978 info);
4979
4980 return TRUE;
4981}
4982
4983/* Return address for Ith PLT stub in section PLT, for relocation REL
4984 or (bfd_vma) -1 if it should not be included. */
4985
4986static bfd_vma
4987elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4988 const arelent *rel ATTRIBUTE_UNUSED)
4989{
4990 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4991}
4992
4993/* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4994
4995static bfd_boolean
4996elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4997{
4998 if (h->plt.offset != (bfd_vma) -1
4999 && !h->def_regular
5000 && !h->pointer_equality_needed)
5001 return FALSE;
5002
5003 return _bfd_elf_hash_symbol (h);
5004}
5005
5006/* Hook called by the linker routine which adds symbols from an object
5007 file. */
5008
5009static bfd_boolean
5010elf_i386_add_symbol_hook (bfd * abfd,
5011 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5012 Elf_Internal_Sym * sym,
5013 const char ** namep ATTRIBUTE_UNUSED,
5014 flagword * flagsp ATTRIBUTE_UNUSED,
5015 asection ** secp ATTRIBUTE_UNUSED,
5016 bfd_vma * valp ATTRIBUTE_UNUSED)
5017{
5018 if ((abfd->flags & DYNAMIC) == 0
5019 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5020 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5021 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5022
5023 return TRUE;
5024}
5025
5026#define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5027#define TARGET_LITTLE_NAME "elf32-i386"
5028#define ELF_ARCH bfd_arch_i386
5029#define ELF_TARGET_ID I386_ELF_DATA
5030#define ELF_MACHINE_CODE EM_386
5031#define ELF_MAXPAGESIZE 0x1000
5032
5033#define elf_backend_can_gc_sections 1
5034#define elf_backend_can_refcount 1
5035#define elf_backend_want_got_plt 1
5036#define elf_backend_plt_readonly 1
5037#define elf_backend_want_plt_sym 0
5038#define elf_backend_got_header_size 12
5039#define elf_backend_plt_alignment 4
5040
5041/* Support RELA for objdump of prelink objects. */
5042#define elf_info_to_howto elf_i386_info_to_howto_rel
5043#define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5044
5045#define bfd_elf32_mkobject elf_i386_mkobject
5046
5047#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5048#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5049#define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5050#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5051#define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5052
5053#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5054#define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5055#define elf_backend_check_relocs elf_i386_check_relocs
5056#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5057#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5058#define elf_backend_fake_sections elf_i386_fake_sections
5059#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5060#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5061#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5062#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5063#define elf_backend_grok_prstatus elf_i386_grok_prstatus
5064#define elf_backend_grok_psinfo elf_i386_grok_psinfo
5065#define elf_backend_reloc_type_class elf_i386_reloc_type_class
5066#define elf_backend_relocate_section elf_i386_relocate_section
5067#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5068#define elf_backend_always_size_sections elf_i386_always_size_sections
5069#define elf_backend_omit_section_dynsym \
5070 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5071#define elf_backend_plt_sym_val elf_i386_plt_sym_val
5072#define elf_backend_hash_symbol elf_i386_hash_symbol
5073#define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5074
5075#include "elf32-target.h"
5076
5077/* FreeBSD support. */
5078
5079#undef TARGET_LITTLE_SYM
5080#define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5081#undef TARGET_LITTLE_NAME
5082#define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5083#undef ELF_OSABI
5084#define ELF_OSABI ELFOSABI_FREEBSD
5085
5086/* The kernel recognizes executables as valid only if they carry a
5087 "FreeBSD" label in the ELF header. So we put this label on all
5088 executables and (for simplicity) also all other object files. */
5089
5090static void
5091elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5092{
5093 _bfd_elf_post_process_headers (abfd, info);
5094
5095#ifdef OLD_FREEBSD_ABI_LABEL
5096 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5097 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5098#endif
5099}
5100
5101#undef elf_backend_post_process_headers
5102#define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5103#undef elf32_bed
5104#define elf32_bed elf32_i386_fbsd_bed
5105
5106#undef elf_backend_add_symbol_hook
5107
5108#include "elf32-target.h"
5109
5110/* Solaris 2. */
5111
5112#undef TARGET_LITTLE_SYM
5113#define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5114#undef TARGET_LITTLE_NAME
5115#define TARGET_LITTLE_NAME "elf32-i386-sol2"
5116
5117/* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5118 objects won't be recognized. */
5119#undef ELF_OSABI
5120
5121#undef elf32_bed
5122#define elf32_bed elf32_i386_sol2_bed
5123
5124/* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5125 boundary. */
5126#undef elf_backend_static_tls_alignment
5127#define elf_backend_static_tls_alignment 8
5128
5129/* The Solaris 2 ABI requires a plt symbol on all platforms.
5130
5131 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5132 File, p.63. */
5133#undef elf_backend_want_plt_sym
5134#define elf_backend_want_plt_sym 1
5135
5136#include "elf32-target.h"
5137
5138/* Native Client support. */
5139
5140#undef TARGET_LITTLE_SYM
5141#define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5142#undef TARGET_LITTLE_NAME
5143#define TARGET_LITTLE_NAME "elf32-i386-nacl"
5144#undef elf32_bed
5145#define elf32_bed elf32_i386_nacl_bed
5146
5147#undef ELF_MAXPAGESIZE
5148#define ELF_MAXPAGESIZE 0x10000
5149
5150/* Restore defaults. */
5151#undef ELF_OSABI
5152#undef elf_backend_want_plt_sym
5153#define elf_backend_want_plt_sym 0
5154#undef elf_backend_post_process_headers
5155#undef elf_backend_static_tls_alignment
5156
5157/* NaCl uses substantially different PLT entries for the same effects. */
5158
5159#undef elf_backend_plt_alignment
5160#define elf_backend_plt_alignment 5
5161#define NACL_PLT_ENTRY_SIZE 64
5162#define NACLMASK 0xe0 /* 32-byte alignment mask. */
5163
5164static const bfd_byte elf_i386_nacl_plt0_entry[] =
5165 {
5166 0xff, 0x35, /* pushl contents of address */
5167 0, 0, 0, 0, /* replaced with address of .got + 4. */
5168 0x8b, 0x0d, /* movl contents of address, %ecx */
5169 0, 0, 0, 0, /* replaced with address of .got + 8. */
5170 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5171 0xff, 0xe1 /* jmp *%ecx */
5172 };
5173
5174static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5175 {
5176 0x8b, 0x0d, /* movl contents of address, %ecx */
5177 0, 0, 0, 0, /* replaced with GOT slot address. */
5178 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5179 0xff, 0xe1, /* jmp *%ecx */
5180
5181 /* Pad to the next 32-byte boundary with nop instructions. */
5182 0x90,
5183 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5184 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5185
5186 /* Lazy GOT entries point here (32-byte aligned). */
5187 0x68, /* pushl immediate */
5188 0, 0, 0, 0, /* replaced with reloc offset. */
5189 0xe9, /* jmp relative */
5190 0, 0, 0, 0, /* replaced with offset to .plt. */
5191
5192 /* Pad to the next 32-byte boundary with nop instructions. */
5193 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5194 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5195 0x90, 0x90
5196 };
5197
5198static const bfd_byte
5199elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5200 {
5201 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5202 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5203 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5204 0xff, 0xe1, /* jmp *%ecx */
5205
5206 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5207 so pad to that size with nop instructions. */
5208 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5209 };
5210
5211static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5212 {
5213 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5214 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5215 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5216 0xff, 0xe1, /* jmp *%ecx */
5217
5218 /* Pad to the next 32-byte boundary with nop instructions. */
5219 0x90,
5220 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5221 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5222
5223 /* Lazy GOT entries point here (32-byte aligned). */
5224 0x68, /* pushl immediate */
5225 0, 0, 0, 0, /* replaced with offset into relocation table. */
5226 0xe9, /* jmp relative */
5227 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5228
5229 /* Pad to the next 32-byte boundary with nop instructions. */
5230 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5231 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5232 0x90, 0x90
5233 };
5234
5235static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5236 {
5237#if (PLT_CIE_LENGTH != 20 \
5238 || PLT_FDE_LENGTH != 36 \
5239 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5240 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5241# error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5242#endif
5243 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5244 0, 0, 0, 0, /* CIE ID */
5245 1, /* CIE version */
5246 'z', 'R', 0, /* Augmentation string */
5247 1, /* Code alignment factor */
5248 0x7c, /* Data alignment factor: -4 */
5249 8, /* Return address column */
5250 1, /* Augmentation size */
5251 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5252 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5253 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5254 DW_CFA_nop, DW_CFA_nop,
5255
5256 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5257 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5258 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5259 0, 0, 0, 0, /* .plt size goes here */
5260 0, /* Augmentation size */
5261 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5262 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5263 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5264 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5265 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5266 13, /* Block length */
5267 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5268 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5269 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5270 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5271 DW_CFA_nop, DW_CFA_nop
5272 };
5273
5274static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5275 {
5276 elf_i386_nacl_plt0_entry, /* plt0_entry */
5277 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5278 2, /* plt0_got1_offset */
5279 8, /* plt0_got2_offset */
5280 elf_i386_nacl_plt_entry, /* plt_entry */
5281 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5282 2, /* plt_got_offset */
5283 33, /* plt_reloc_offset */
5284 38, /* plt_plt_offset */
5285 32, /* plt_lazy_offset */
5286 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5287 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5288 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5289 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5290 };
5291
5292static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5293 {
5294 &elf_i386_nacl_plt, /* plt */
5295 0x90, /* plt0_pad_byte: nop insn */
5296 0, /* is_vxworks */
5297 };
5298
5299static bfd_boolean
5300elf32_i386_nacl_elf_object_p (bfd *abfd)
5301{
5302 /* Set the right machine number for a NaCl i386 ELF32 file. */
5303 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5304 return TRUE;
5305}
5306
5307#undef elf_backend_arch_data
5308#define elf_backend_arch_data &elf_i386_nacl_arch_bed
5309
5310#undef elf_backend_object_p
5311#define elf_backend_object_p elf32_i386_nacl_elf_object_p
5312#undef elf_backend_modify_segment_map
5313#define elf_backend_modify_segment_map nacl_modify_segment_map
5314#undef elf_backend_modify_program_headers
5315#define elf_backend_modify_program_headers nacl_modify_program_headers
5316#undef elf_backend_final_write_processing
5317#define elf_backend_final_write_processing nacl_final_write_processing
5318
5319#include "elf32-target.h"
5320
5321/* Restore defaults. */
5322#undef elf_backend_object_p
5323#undef elf_backend_modify_segment_map
5324#undef elf_backend_modify_program_headers
5325#undef elf_backend_final_write_processing
5326
5327/* VxWorks support. */
5328
5329#undef TARGET_LITTLE_SYM
5330#define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5331#undef TARGET_LITTLE_NAME
5332#define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5333#undef ELF_OSABI
5334#undef elf_backend_plt_alignment
5335#define elf_backend_plt_alignment 4
5336
5337static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5338 {
5339 &elf_i386_plt, /* plt */
5340 0x90, /* plt0_pad_byte */
5341 1, /* is_vxworks */
5342 };
5343
5344#undef elf_backend_arch_data
5345#define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5346
5347#undef elf_backend_relocs_compatible
5348#undef elf_backend_add_symbol_hook
5349#define elf_backend_add_symbol_hook \
5350 elf_vxworks_add_symbol_hook
5351#undef elf_backend_link_output_symbol_hook
5352#define elf_backend_link_output_symbol_hook \
5353 elf_vxworks_link_output_symbol_hook
5354#undef elf_backend_emit_relocs
5355#define elf_backend_emit_relocs elf_vxworks_emit_relocs
5356#undef elf_backend_final_write_processing
5357#define elf_backend_final_write_processing \
5358 elf_vxworks_final_write_processing
5359#undef elf_backend_static_tls_alignment
5360
5361/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5362 define it. */
5363#undef elf_backend_want_plt_sym
5364#define elf_backend_want_plt_sym 1
5365
5366#undef elf32_bed
5367#define elf32_bed elf32_i386_vxworks_bed
5368
5369#include "elf32-target.h"
GDB Binutils - Deliverables
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