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[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 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21#include "bfd.h"
22#include "sysdep.h"
23#include "bfdlink.h"
24#include "libbfd.h"
25#include "elf-bfd.h"
26#include "elf-vxworks.h"
27
28/* 386 uses REL relocations instead of RELA. */
29#define USE_REL 1
30
31#include "elf/i386.h"
32
33static reloc_howto_type elf_howto_table[]=
34{
35 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
36 bfd_elf_generic_reloc, "R_386_NONE",
37 TRUE, 0x00000000, 0x00000000, FALSE),
38 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
39 bfd_elf_generic_reloc, "R_386_32",
40 TRUE, 0xffffffff, 0xffffffff, FALSE),
41 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
42 bfd_elf_generic_reloc, "R_386_PC32",
43 TRUE, 0xffffffff, 0xffffffff, TRUE),
44 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_GOT32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PLT32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_COPY",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
55 TRUE, 0xffffffff, 0xffffffff, FALSE),
56 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_RELATIVE",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_GOTOFF",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_GOTPC",
67 TRUE, 0xffffffff, 0xffffffff, TRUE),
68
69 /* We have a gap in the reloc numbers here.
70 R_386_standard counts the number up to this point, and
71 R_386_ext_offset is the value to subtract from a reloc type of
72 R_386_16 thru R_386_PC8 to form an index into this table. */
73#define R_386_standard (R_386_GOTPC + 1)
74#define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
75
76 /* These relocs are a GNU extension. */
77 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
79 TRUE, 0xffffffff, 0xffffffff, FALSE),
80 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_386_TLS_IE",
82 TRUE, 0xffffffff, 0xffffffff, FALSE),
83 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_LE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GD",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LDM",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_16",
97 TRUE, 0xffff, 0xffff, FALSE),
98 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_PC16",
100 TRUE, 0xffff, 0xffff, TRUE),
101 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_8",
103 TRUE, 0xff, 0xff, FALSE),
104 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_386_PC8",
106 TRUE, 0xff, 0xff, TRUE),
107
108#define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
109#define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
110 /* These are common with Solaris TLS implementation. */
111 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
113 TRUE, 0xffffffff, 0xffffffff, FALSE),
114 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
116 TRUE, 0xffffffff, 0xffffffff, FALSE),
117 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129
130 /* Another gap. */
131#define R_386_tls (R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
132#define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
133
134/* GNU extension to record C++ vtable hierarchy. */
135 HOWTO (R_386_GNU_VTINHERIT, /* type */
136 0, /* rightshift */
137 2, /* size (0 = byte, 1 = short, 2 = long) */
138 0, /* bitsize */
139 FALSE, /* pc_relative */
140 0, /* bitpos */
141 complain_overflow_dont, /* complain_on_overflow */
142 NULL, /* special_function */
143 "R_386_GNU_VTINHERIT", /* name */
144 FALSE, /* partial_inplace */
145 0, /* src_mask */
146 0, /* dst_mask */
147 FALSE), /* pcrel_offset */
148
149/* GNU extension to record C++ vtable member usage. */
150 HOWTO (R_386_GNU_VTENTRY, /* type */
151 0, /* rightshift */
152 2, /* size (0 = byte, 1 = short, 2 = long) */
153 0, /* bitsize */
154 FALSE, /* pc_relative */
155 0, /* bitpos */
156 complain_overflow_dont, /* complain_on_overflow */
157 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
158 "R_386_GNU_VTENTRY", /* name */
159 FALSE, /* partial_inplace */
160 0, /* src_mask */
161 0, /* dst_mask */
162 FALSE) /* pcrel_offset */
163
164#define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
165
166};
167
168#ifdef DEBUG_GEN_RELOC
169#define TRACE(str) \
170 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
171#else
172#define TRACE(str)
173#endif
174
175static reloc_howto_type *
176elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
177 bfd_reloc_code_real_type code)
178{
179 switch (code)
180 {
181 case BFD_RELOC_NONE:
182 TRACE ("BFD_RELOC_NONE");
183 return &elf_howto_table[R_386_NONE];
184
185 case BFD_RELOC_32:
186 TRACE ("BFD_RELOC_32");
187 return &elf_howto_table[R_386_32];
188
189 case BFD_RELOC_CTOR:
190 TRACE ("BFD_RELOC_CTOR");
191 return &elf_howto_table[R_386_32];
192
193 case BFD_RELOC_32_PCREL:
194 TRACE ("BFD_RELOC_PC32");
195 return &elf_howto_table[R_386_PC32];
196
197 case BFD_RELOC_386_GOT32:
198 TRACE ("BFD_RELOC_386_GOT32");
199 return &elf_howto_table[R_386_GOT32];
200
201 case BFD_RELOC_386_PLT32:
202 TRACE ("BFD_RELOC_386_PLT32");
203 return &elf_howto_table[R_386_PLT32];
204
205 case BFD_RELOC_386_COPY:
206 TRACE ("BFD_RELOC_386_COPY");
207 return &elf_howto_table[R_386_COPY];
208
209 case BFD_RELOC_386_GLOB_DAT:
210 TRACE ("BFD_RELOC_386_GLOB_DAT");
211 return &elf_howto_table[R_386_GLOB_DAT];
212
213 case BFD_RELOC_386_JUMP_SLOT:
214 TRACE ("BFD_RELOC_386_JUMP_SLOT");
215 return &elf_howto_table[R_386_JUMP_SLOT];
216
217 case BFD_RELOC_386_RELATIVE:
218 TRACE ("BFD_RELOC_386_RELATIVE");
219 return &elf_howto_table[R_386_RELATIVE];
220
221 case BFD_RELOC_386_GOTOFF:
222 TRACE ("BFD_RELOC_386_GOTOFF");
223 return &elf_howto_table[R_386_GOTOFF];
224
225 case BFD_RELOC_386_GOTPC:
226 TRACE ("BFD_RELOC_386_GOTPC");
227 return &elf_howto_table[R_386_GOTPC];
228
229 /* These relocs are a GNU extension. */
230 case BFD_RELOC_386_TLS_TPOFF:
231 TRACE ("BFD_RELOC_386_TLS_TPOFF");
232 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
233
234 case BFD_RELOC_386_TLS_IE:
235 TRACE ("BFD_RELOC_386_TLS_IE");
236 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
237
238 case BFD_RELOC_386_TLS_GOTIE:
239 TRACE ("BFD_RELOC_386_TLS_GOTIE");
240 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
241
242 case BFD_RELOC_386_TLS_LE:
243 TRACE ("BFD_RELOC_386_TLS_LE");
244 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
245
246 case BFD_RELOC_386_TLS_GD:
247 TRACE ("BFD_RELOC_386_TLS_GD");
248 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
249
250 case BFD_RELOC_386_TLS_LDM:
251 TRACE ("BFD_RELOC_386_TLS_LDM");
252 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
253
254 case BFD_RELOC_16:
255 TRACE ("BFD_RELOC_16");
256 return &elf_howto_table[R_386_16 - R_386_ext_offset];
257
258 case BFD_RELOC_16_PCREL:
259 TRACE ("BFD_RELOC_16_PCREL");
260 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
261
262 case BFD_RELOC_8:
263 TRACE ("BFD_RELOC_8");
264 return &elf_howto_table[R_386_8 - R_386_ext_offset];
265
266 case BFD_RELOC_8_PCREL:
267 TRACE ("BFD_RELOC_8_PCREL");
268 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
269
270 /* Common with Sun TLS implementation. */
271 case BFD_RELOC_386_TLS_LDO_32:
272 TRACE ("BFD_RELOC_386_TLS_LDO_32");
273 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
274
275 case BFD_RELOC_386_TLS_IE_32:
276 TRACE ("BFD_RELOC_386_TLS_IE_32");
277 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
278
279 case BFD_RELOC_386_TLS_LE_32:
280 TRACE ("BFD_RELOC_386_TLS_LE_32");
281 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
282
283 case BFD_RELOC_386_TLS_DTPMOD32:
284 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
285 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
286
287 case BFD_RELOC_386_TLS_DTPOFF32:
288 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
289 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
290
291 case BFD_RELOC_386_TLS_TPOFF32:
292 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
293 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
294
295 case BFD_RELOC_VTABLE_INHERIT:
296 TRACE ("BFD_RELOC_VTABLE_INHERIT");
297 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
298
299 case BFD_RELOC_VTABLE_ENTRY:
300 TRACE ("BFD_RELOC_VTABLE_ENTRY");
301 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
302
303 default:
304 break;
305 }
306
307 TRACE ("Unknown");
308 return 0;
309}
310
311static void
312elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
313 arelent *cache_ptr,
314 Elf_Internal_Rela *dst)
315{
316 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
317 unsigned int indx;
318
319 if ((indx = r_type) >= R_386_standard
320 && ((indx = r_type - R_386_ext_offset) - R_386_standard
321 >= R_386_ext - R_386_standard)
322 && ((indx = r_type - R_386_tls_offset) - R_386_ext
323 >= R_386_tls - R_386_ext)
324 && ((indx = r_type - R_386_vt_offset) - R_386_tls
325 >= R_386_vt - R_386_tls))
326 {
327 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
328 abfd, (int) r_type);
329 indx = R_386_NONE;
330 }
331 cache_ptr->howto = &elf_howto_table[indx];
332}
333
334/* Return whether a symbol name implies a local label. The UnixWare
335 2.1 cc generates temporary symbols that start with .X, so we
336 recognize them here. FIXME: do other SVR4 compilers also use .X?.
337 If so, we should move the .X recognition into
338 _bfd_elf_is_local_label_name. */
339
340static bfd_boolean
341elf_i386_is_local_label_name (bfd *abfd, const char *name)
342{
343 if (name[0] == '.' && name[1] == 'X')
344 return TRUE;
345
346 return _bfd_elf_is_local_label_name (abfd, name);
347}
348\f
349/* Support for core dump NOTE sections. */
350
351static bfd_boolean
352elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
353{
354 int offset;
355 size_t size;
356
357 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
358 {
359 int pr_version = bfd_get_32 (abfd, note->descdata);
360
361 if (pr_version != 1)
362 return FALSE;
363
364 /* pr_cursig */
365 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
366
367 /* pr_pid */
368 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
369
370 /* pr_reg */
371 offset = 28;
372 size = bfd_get_32 (abfd, note->descdata + 8);
373 }
374 else
375 {
376 switch (note->descsz)
377 {
378 default:
379 return FALSE;
380
381 case 144: /* Linux/i386 */
382 /* pr_cursig */
383 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
384
385 /* pr_pid */
386 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
387
388 /* pr_reg */
389 offset = 72;
390 size = 68;
391
392 break;
393 }
394 }
395
396 /* Make a ".reg/999" section. */
397 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
398 size, note->descpos + offset);
399}
400
401static bfd_boolean
402elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
403{
404 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
405 {
406 int pr_version = bfd_get_32 (abfd, note->descdata);
407
408 if (pr_version != 1)
409 return FALSE;
410
411 elf_tdata (abfd)->core_program
412 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
413 elf_tdata (abfd)->core_command
414 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
415 }
416 else
417 {
418 switch (note->descsz)
419 {
420 default:
421 return FALSE;
422
423 case 124: /* Linux/i386 elf_prpsinfo. */
424 elf_tdata (abfd)->core_program
425 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
426 elf_tdata (abfd)->core_command
427 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
428 }
429 }
430
431 /* Note that for some reason, a spurious space is tacked
432 onto the end of the args in some (at least one anyway)
433 implementations, so strip it off if it exists. */
434 {
435 char *command = elf_tdata (abfd)->core_command;
436 int n = strlen (command);
437
438 if (0 < n && command[n - 1] == ' ')
439 command[n - 1] = '\0';
440 }
441
442 return TRUE;
443}
444\f
445/* Functions for the i386 ELF linker.
446
447 In order to gain some understanding of code in this file without
448 knowing all the intricate details of the linker, note the
449 following:
450
451 Functions named elf_i386_* are called by external routines, other
452 functions are only called locally. elf_i386_* functions appear
453 in this file more or less in the order in which they are called
454 from external routines. eg. elf_i386_check_relocs is called
455 early in the link process, elf_i386_finish_dynamic_sections is
456 one of the last functions. */
457
458
459/* The name of the dynamic interpreter. This is put in the .interp
460 section. */
461
462#define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
463
464/* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
465 copying dynamic variables from a shared lib into an app's dynbss
466 section, and instead use a dynamic relocation to point into the
467 shared lib. */
468#define ELIMINATE_COPY_RELOCS 1
469
470/* The size in bytes of an entry in the procedure linkage table. */
471
472#define PLT_ENTRY_SIZE 16
473
474/* The first entry in an absolute procedure linkage table looks like
475 this. See the SVR4 ABI i386 supplement to see how this works.
476 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
477
478static const bfd_byte elf_i386_plt0_entry[12] =
479{
480 0xff, 0x35, /* pushl contents of address */
481 0, 0, 0, 0, /* replaced with address of .got + 4. */
482 0xff, 0x25, /* jmp indirect */
483 0, 0, 0, 0 /* replaced with address of .got + 8. */
484};
485
486/* Subsequent entries in an absolute procedure linkage table look like
487 this. */
488
489static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
490{
491 0xff, 0x25, /* jmp indirect */
492 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
493 0x68, /* pushl immediate */
494 0, 0, 0, 0, /* replaced with offset into relocation table. */
495 0xe9, /* jmp relative */
496 0, 0, 0, 0 /* replaced with offset to start of .plt. */
497};
498
499/* The first entry in a PIC procedure linkage table look like this.
500 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
501
502static const bfd_byte elf_i386_pic_plt0_entry[12] =
503{
504 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
505 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
506};
507
508/* Subsequent entries in a PIC procedure linkage table look like this. */
509
510static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
511{
512 0xff, 0xa3, /* jmp *offset(%ebx) */
513 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
514 0x68, /* pushl immediate */
515 0, 0, 0, 0, /* replaced with offset into relocation table. */
516 0xe9, /* jmp relative */
517 0, 0, 0, 0 /* replaced with offset to start of .plt. */
518};
519
520/* On VxWorks, the .rel.plt.unloaded section has absolute relocations
521 for the PLTResolve stub and then for each PLT entry. */
522#define PLTRESOLVE_RELOCS_SHLIB 0
523#define PLTRESOLVE_RELOCS 2
524#define PLT_NON_JUMP_SLOT_RELOCS 2
525
526/* The i386 linker needs to keep track of the number of relocs that it
527 decides to copy as dynamic relocs in check_relocs for each symbol.
528 This is so that it can later discard them if they are found to be
529 unnecessary. We store the information in a field extending the
530 regular ELF linker hash table. */
531
532struct elf_i386_dyn_relocs
533{
534 struct elf_i386_dyn_relocs *next;
535
536 /* The input section of the reloc. */
537 asection *sec;
538
539 /* Total number of relocs copied for the input section. */
540 bfd_size_type count;
541
542 /* Number of pc-relative relocs copied for the input section. */
543 bfd_size_type pc_count;
544};
545
546/* i386 ELF linker hash entry. */
547
548struct elf_i386_link_hash_entry
549{
550 struct elf_link_hash_entry elf;
551
552 /* Track dynamic relocs copied for this symbol. */
553 struct elf_i386_dyn_relocs *dyn_relocs;
554
555#define GOT_UNKNOWN 0
556#define GOT_NORMAL 1
557#define GOT_TLS_GD 2
558#define GOT_TLS_IE 4
559#define GOT_TLS_IE_POS 5
560#define GOT_TLS_IE_NEG 6
561#define GOT_TLS_IE_BOTH 7
562 unsigned char tls_type;
563};
564
565#define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
566
567struct elf_i386_obj_tdata
568{
569 struct elf_obj_tdata root;
570
571 /* tls_type for each local got entry. */
572 char *local_got_tls_type;
573};
574
575#define elf_i386_tdata(abfd) \
576 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
577
578#define elf_i386_local_got_tls_type(abfd) \
579 (elf_i386_tdata (abfd)->local_got_tls_type)
580
581static bfd_boolean
582elf_i386_mkobject (bfd *abfd)
583{
584 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
585 abfd->tdata.any = bfd_zalloc (abfd, amt);
586 if (abfd->tdata.any == NULL)
587 return FALSE;
588 return TRUE;
589}
590
591/* i386 ELF linker hash table. */
592
593struct elf_i386_link_hash_table
594{
595 struct elf_link_hash_table elf;
596
597 /* Short-cuts to get to dynamic linker sections. */
598 asection *sgot;
599 asection *sgotplt;
600 asection *srelgot;
601 asection *splt;
602 asection *srelplt;
603 asection *sdynbss;
604 asection *srelbss;
605
606 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
607 asection *srelplt2;
608
609 /* Short-cuts to frequently used symbols for VxWorks targets. */
610 struct elf_link_hash_entry *hgot, *hplt;
611
612 /* True if the target system is VxWorks. */
613 int is_vxworks;
614
615 /* Value used to fill the last word of the first plt entry. */
616 bfd_byte plt0_pad_byte;
617
618 union {
619 bfd_signed_vma refcount;
620 bfd_vma offset;
621 } tls_ldm_got;
622
623 /* Small local sym to section mapping cache. */
624 struct sym_sec_cache sym_sec;
625};
626
627/* Get the i386 ELF linker hash table from a link_info structure. */
628
629#define elf_i386_hash_table(p) \
630 ((struct elf_i386_link_hash_table *) ((p)->hash))
631
632/* Create an entry in an i386 ELF linker hash table. */
633
634static struct bfd_hash_entry *
635link_hash_newfunc (struct bfd_hash_entry *entry,
636 struct bfd_hash_table *table,
637 const char *string)
638{
639 /* Allocate the structure if it has not already been allocated by a
640 subclass. */
641 if (entry == NULL)
642 {
643 entry = bfd_hash_allocate (table,
644 sizeof (struct elf_i386_link_hash_entry));
645 if (entry == NULL)
646 return entry;
647 }
648
649 /* Call the allocation method of the superclass. */
650 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
651 if (entry != NULL)
652 {
653 struct elf_i386_link_hash_entry *eh;
654
655 eh = (struct elf_i386_link_hash_entry *) entry;
656 eh->dyn_relocs = NULL;
657 eh->tls_type = GOT_UNKNOWN;
658 }
659
660 return entry;
661}
662
663/* Create an i386 ELF linker hash table. */
664
665static struct bfd_link_hash_table *
666elf_i386_link_hash_table_create (bfd *abfd)
667{
668 struct elf_i386_link_hash_table *ret;
669 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
670
671 ret = bfd_malloc (amt);
672 if (ret == NULL)
673 return NULL;
674
675 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
676 {
677 free (ret);
678 return NULL;
679 }
680
681 ret->sgot = NULL;
682 ret->sgotplt = NULL;
683 ret->srelgot = NULL;
684 ret->splt = NULL;
685 ret->srelplt = NULL;
686 ret->sdynbss = NULL;
687 ret->srelbss = NULL;
688 ret->tls_ldm_got.refcount = 0;
689 ret->sym_sec.abfd = NULL;
690 ret->is_vxworks = 0;
691 ret->srelplt2 = NULL;
692 ret->hgot = NULL;
693 ret->hplt = NULL;
694 ret->plt0_pad_byte = 0;
695
696 return &ret->elf.root;
697}
698
699/* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
700 shortcuts to them in our hash table. */
701
702static bfd_boolean
703create_got_section (bfd *dynobj, struct bfd_link_info *info)
704{
705 struct elf_i386_link_hash_table *htab;
706
707 if (! _bfd_elf_create_got_section (dynobj, info))
708 return FALSE;
709
710 htab = elf_i386_hash_table (info);
711 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
712 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
713 if (!htab->sgot || !htab->sgotplt)
714 abort ();
715
716 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
717 (SEC_ALLOC | SEC_LOAD
718 | SEC_HAS_CONTENTS
719 | SEC_IN_MEMORY
720 | SEC_LINKER_CREATED
721 | SEC_READONLY));
722 if (htab->srelgot == NULL
723 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
724 return FALSE;
725 return TRUE;
726}
727
728/* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
729 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
730 hash table. */
731
732static bfd_boolean
733elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
734{
735 struct elf_i386_link_hash_table *htab;
736 asection * s;
737 int flags;
738 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
739
740 htab = elf_i386_hash_table (info);
741 if (!htab->sgot && !create_got_section (dynobj, info))
742 return FALSE;
743
744 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
745 return FALSE;
746
747 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
748 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
749 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
750 if (!info->shared)
751 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
752
753 if (!htab->splt || !htab->srelplt || !htab->sdynbss
754 || (!info->shared && !htab->srelbss))
755 abort ();
756
757 if (htab->is_vxworks && !info->shared)
758 {
759 s = bfd_make_section (dynobj, ".rel.plt.unloaded");
760 flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_READONLY
761 | SEC_LINKER_CREATED);
762 if (s == NULL
763 || ! bfd_set_section_flags (dynobj, s, flags)
764 || ! bfd_set_section_alignment (dynobj, s, bed->s->log_file_align))
765 return FALSE;
766 htab->srelplt2 = s;
767 }
768
769 return TRUE;
770}
771
772/* Copy the extra info we tack onto an elf_link_hash_entry. */
773
774static void
775elf_i386_copy_indirect_symbol (const struct elf_backend_data *bed,
776 struct elf_link_hash_entry *dir,
777 struct elf_link_hash_entry *ind)
778{
779 struct elf_i386_link_hash_entry *edir, *eind;
780
781 edir = (struct elf_i386_link_hash_entry *) dir;
782 eind = (struct elf_i386_link_hash_entry *) ind;
783
784 if (eind->dyn_relocs != NULL)
785 {
786 if (edir->dyn_relocs != NULL)
787 {
788 struct elf_i386_dyn_relocs **pp;
789 struct elf_i386_dyn_relocs *p;
790
791 if (ind->root.type == bfd_link_hash_indirect)
792 abort ();
793
794 /* Add reloc counts against the weak sym to the strong sym
795 list. Merge any entries against the same section. */
796 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
797 {
798 struct elf_i386_dyn_relocs *q;
799
800 for (q = edir->dyn_relocs; q != NULL; q = q->next)
801 if (q->sec == p->sec)
802 {
803 q->pc_count += p->pc_count;
804 q->count += p->count;
805 *pp = p->next;
806 break;
807 }
808 if (q == NULL)
809 pp = &p->next;
810 }
811 *pp = edir->dyn_relocs;
812 }
813
814 edir->dyn_relocs = eind->dyn_relocs;
815 eind->dyn_relocs = NULL;
816 }
817
818 if (ind->root.type == bfd_link_hash_indirect
819 && dir->got.refcount <= 0)
820 {
821 edir->tls_type = eind->tls_type;
822 eind->tls_type = GOT_UNKNOWN;
823 }
824
825 if (ELIMINATE_COPY_RELOCS
826 && ind->root.type != bfd_link_hash_indirect
827 && dir->dynamic_adjusted)
828 {
829 /* If called to transfer flags for a weakdef during processing
830 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
831 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
832 dir->ref_dynamic |= ind->ref_dynamic;
833 dir->ref_regular |= ind->ref_regular;
834 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
835 dir->needs_plt |= ind->needs_plt;
836 dir->pointer_equality_needed |= ind->pointer_equality_needed;
837 }
838 else
839 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
840}
841
842static int
843elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
844{
845 if (info->shared)
846 return r_type;
847
848 switch (r_type)
849 {
850 case R_386_TLS_GD:
851 case R_386_TLS_IE_32:
852 if (is_local)
853 return R_386_TLS_LE_32;
854 return R_386_TLS_IE_32;
855 case R_386_TLS_IE:
856 case R_386_TLS_GOTIE:
857 if (is_local)
858 return R_386_TLS_LE_32;
859 return r_type;
860 case R_386_TLS_LDM:
861 return R_386_TLS_LE_32;
862 }
863
864 return r_type;
865}
866
867/* Look through the relocs for a section during the first phase, and
868 calculate needed space in the global offset table, procedure linkage
869 table, and dynamic reloc sections. */
870
871static bfd_boolean
872elf_i386_check_relocs (bfd *abfd,
873 struct bfd_link_info *info,
874 asection *sec,
875 const Elf_Internal_Rela *relocs)
876{
877 struct elf_i386_link_hash_table *htab;
878 Elf_Internal_Shdr *symtab_hdr;
879 struct elf_link_hash_entry **sym_hashes;
880 const Elf_Internal_Rela *rel;
881 const Elf_Internal_Rela *rel_end;
882 asection *sreloc;
883
884 if (info->relocatable)
885 return TRUE;
886
887 htab = elf_i386_hash_table (info);
888 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
889 sym_hashes = elf_sym_hashes (abfd);
890
891 sreloc = NULL;
892
893 rel_end = relocs + sec->reloc_count;
894 for (rel = relocs; rel < rel_end; rel++)
895 {
896 unsigned int r_type;
897 unsigned long r_symndx;
898 struct elf_link_hash_entry *h;
899
900 r_symndx = ELF32_R_SYM (rel->r_info);
901 r_type = ELF32_R_TYPE (rel->r_info);
902
903 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
904 {
905 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
906 abfd,
907 r_symndx);
908 return FALSE;
909 }
910
911 if (r_symndx < symtab_hdr->sh_info)
912 h = NULL;
913 else
914 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
915
916 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
917
918 switch (r_type)
919 {
920 case R_386_TLS_LDM:
921 htab->tls_ldm_got.refcount += 1;
922 goto create_got;
923
924 case R_386_PLT32:
925 /* This symbol requires a procedure linkage table entry. We
926 actually build the entry in adjust_dynamic_symbol,
927 because this might be a case of linking PIC code which is
928 never referenced by a dynamic object, in which case we
929 don't need to generate a procedure linkage table entry
930 after all. */
931
932 /* If this is a local symbol, we resolve it directly without
933 creating a procedure linkage table entry. */
934 if (h == NULL)
935 continue;
936
937 h->needs_plt = 1;
938 h->plt.refcount += 1;
939 break;
940
941 case R_386_TLS_IE_32:
942 case R_386_TLS_IE:
943 case R_386_TLS_GOTIE:
944 if (info->shared)
945 info->flags |= DF_STATIC_TLS;
946 /* Fall through */
947
948 case R_386_GOT32:
949 case R_386_TLS_GD:
950 /* This symbol requires a global offset table entry. */
951 {
952 int tls_type, old_tls_type;
953
954 switch (r_type)
955 {
956 default:
957 case R_386_GOT32: tls_type = GOT_NORMAL; break;
958 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
959 case R_386_TLS_IE_32:
960 if (ELF32_R_TYPE (rel->r_info) == r_type)
961 tls_type = GOT_TLS_IE_NEG;
962 else
963 /* If this is a GD->IE transition, we may use either of
964 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
965 tls_type = GOT_TLS_IE;
966 break;
967 case R_386_TLS_IE:
968 case R_386_TLS_GOTIE:
969 tls_type = GOT_TLS_IE_POS; break;
970 }
971
972 if (h != NULL)
973 {
974 h->got.refcount += 1;
975 old_tls_type = elf_i386_hash_entry(h)->tls_type;
976 }
977 else
978 {
979 bfd_signed_vma *local_got_refcounts;
980
981 /* This is a global offset table entry for a local symbol. */
982 local_got_refcounts = elf_local_got_refcounts (abfd);
983 if (local_got_refcounts == NULL)
984 {
985 bfd_size_type size;
986
987 size = symtab_hdr->sh_info;
988 size *= (sizeof (bfd_signed_vma) + sizeof(char));
989 local_got_refcounts = bfd_zalloc (abfd, size);
990 if (local_got_refcounts == NULL)
991 return FALSE;
992 elf_local_got_refcounts (abfd) = local_got_refcounts;
993 elf_i386_local_got_tls_type (abfd)
994 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
995 }
996 local_got_refcounts[r_symndx] += 1;
997 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
998 }
999
1000 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1001 tls_type |= old_tls_type;
1002 /* If a TLS symbol is accessed using IE at least once,
1003 there is no point to use dynamic model for it. */
1004 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1005 && (old_tls_type != GOT_TLS_GD
1006 || (tls_type & GOT_TLS_IE) == 0))
1007 {
1008 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
1009 tls_type = old_tls_type;
1010 else
1011 {
1012 (*_bfd_error_handler)
1013 (_("%B: `%s' accessed both as normal and "
1014 "thread local symbol"),
1015 abfd,
1016 h ? h->root.root.string : "<local>");
1017 return FALSE;
1018 }
1019 }
1020
1021 if (old_tls_type != tls_type)
1022 {
1023 if (h != NULL)
1024 elf_i386_hash_entry (h)->tls_type = tls_type;
1025 else
1026 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1027 }
1028 }
1029 /* Fall through */
1030
1031 case R_386_GOTOFF:
1032 case R_386_GOTPC:
1033 create_got:
1034 if (htab->sgot == NULL)
1035 {
1036 if (htab->elf.dynobj == NULL)
1037 htab->elf.dynobj = abfd;
1038 if (!create_got_section (htab->elf.dynobj, info))
1039 return FALSE;
1040 }
1041 if (r_type != R_386_TLS_IE)
1042 break;
1043 /* Fall through */
1044
1045 case R_386_TLS_LE_32:
1046 case R_386_TLS_LE:
1047 if (!info->shared)
1048 break;
1049 info->flags |= DF_STATIC_TLS;
1050 /* Fall through */
1051
1052 case R_386_32:
1053 case R_386_PC32:
1054 if (h != NULL && !info->shared)
1055 {
1056 /* If this reloc is in a read-only section, we might
1057 need a copy reloc. We can't check reliably at this
1058 stage whether the section is read-only, as input
1059 sections have not yet been mapped to output sections.
1060 Tentatively set the flag for now, and correct in
1061 adjust_dynamic_symbol. */
1062 h->non_got_ref = 1;
1063
1064 /* We may need a .plt entry if the function this reloc
1065 refers to is in a shared lib. */
1066 h->plt.refcount += 1;
1067 if (r_type != R_386_PC32)
1068 h->pointer_equality_needed = 1;
1069 }
1070
1071 /* If we are creating a shared library, and this is a reloc
1072 against a global symbol, or a non PC relative reloc
1073 against a local symbol, then we need to copy the reloc
1074 into the shared library. However, if we are linking with
1075 -Bsymbolic, we do not need to copy a reloc against a
1076 global symbol which is defined in an object we are
1077 including in the link (i.e., DEF_REGULAR is set). At
1078 this point we have not seen all the input files, so it is
1079 possible that DEF_REGULAR is not set now but will be set
1080 later (it is never cleared). In case of a weak definition,
1081 DEF_REGULAR may be cleared later by a strong definition in
1082 a shared library. We account for that possibility below by
1083 storing information in the relocs_copied field of the hash
1084 table entry. A similar situation occurs when creating
1085 shared libraries and symbol visibility changes render the
1086 symbol local.
1087
1088 If on the other hand, we are creating an executable, we
1089 may need to keep relocations for symbols satisfied by a
1090 dynamic library if we manage to avoid copy relocs for the
1091 symbol. */
1092 if ((info->shared
1093 && (sec->flags & SEC_ALLOC) != 0
1094 && (r_type != R_386_PC32
1095 || (h != NULL
1096 && (! info->symbolic
1097 || h->root.type == bfd_link_hash_defweak
1098 || !h->def_regular))))
1099 || (ELIMINATE_COPY_RELOCS
1100 && !info->shared
1101 && (sec->flags & SEC_ALLOC) != 0
1102 && h != NULL
1103 && (h->root.type == bfd_link_hash_defweak
1104 || !h->def_regular)))
1105 {
1106 struct elf_i386_dyn_relocs *p;
1107 struct elf_i386_dyn_relocs **head;
1108
1109 /* We must copy these reloc types into the output file.
1110 Create a reloc section in dynobj and make room for
1111 this reloc. */
1112 if (sreloc == NULL)
1113 {
1114 const char *name;
1115 bfd *dynobj;
1116 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1117 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1118
1119 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1120 if (name == NULL)
1121 return FALSE;
1122
1123 if (strncmp (name, ".rel", 4) != 0
1124 || strcmp (bfd_get_section_name (abfd, sec),
1125 name + 4) != 0)
1126 {
1127 (*_bfd_error_handler)
1128 (_("%B: bad relocation section name `%s\'"),
1129 abfd, name);
1130 }
1131
1132 if (htab->elf.dynobj == NULL)
1133 htab->elf.dynobj = abfd;
1134
1135 dynobj = htab->elf.dynobj;
1136 sreloc = bfd_get_section_by_name (dynobj, name);
1137 if (sreloc == NULL)
1138 {
1139 flagword flags;
1140
1141 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1142 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1143 if ((sec->flags & SEC_ALLOC) != 0)
1144 flags |= SEC_ALLOC | SEC_LOAD;
1145 sreloc = bfd_make_section_with_flags (dynobj,
1146 name,
1147 flags);
1148 if (sreloc == NULL
1149 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1150 return FALSE;
1151 }
1152 elf_section_data (sec)->sreloc = sreloc;
1153 }
1154
1155 /* If this is a global symbol, we count the number of
1156 relocations we need for this symbol. */
1157 if (h != NULL)
1158 {
1159 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1160 }
1161 else
1162 {
1163 /* Track dynamic relocs needed for local syms too.
1164 We really need local syms available to do this
1165 easily. Oh well. */
1166
1167 asection *s;
1168 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1169 sec, r_symndx);
1170 if (s == NULL)
1171 return FALSE;
1172
1173 head = ((struct elf_i386_dyn_relocs **)
1174 &elf_section_data (s)->local_dynrel);
1175 }
1176
1177 p = *head;
1178 if (p == NULL || p->sec != sec)
1179 {
1180 bfd_size_type amt = sizeof *p;
1181 p = bfd_alloc (htab->elf.dynobj, amt);
1182 if (p == NULL)
1183 return FALSE;
1184 p->next = *head;
1185 *head = p;
1186 p->sec = sec;
1187 p->count = 0;
1188 p->pc_count = 0;
1189 }
1190
1191 p->count += 1;
1192 if (r_type == R_386_PC32)
1193 p->pc_count += 1;
1194 }
1195 break;
1196
1197 /* This relocation describes the C++ object vtable hierarchy.
1198 Reconstruct it for later use during GC. */
1199 case R_386_GNU_VTINHERIT:
1200 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1201 return FALSE;
1202 break;
1203
1204 /* This relocation describes which C++ vtable entries are actually
1205 used. Record for later use during GC. */
1206 case R_386_GNU_VTENTRY:
1207 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1208 return FALSE;
1209 break;
1210
1211 default:
1212 break;
1213 }
1214 }
1215
1216 return TRUE;
1217}
1218
1219/* Return the section that should be marked against GC for a given
1220 relocation. */
1221
1222static asection *
1223elf_i386_gc_mark_hook (asection *sec,
1224 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1225 Elf_Internal_Rela *rel,
1226 struct elf_link_hash_entry *h,
1227 Elf_Internal_Sym *sym)
1228{
1229 if (h != NULL)
1230 {
1231 switch (ELF32_R_TYPE (rel->r_info))
1232 {
1233 case R_386_GNU_VTINHERIT:
1234 case R_386_GNU_VTENTRY:
1235 break;
1236
1237 default:
1238 switch (h->root.type)
1239 {
1240 case bfd_link_hash_defined:
1241 case bfd_link_hash_defweak:
1242 return h->root.u.def.section;
1243
1244 case bfd_link_hash_common:
1245 return h->root.u.c.p->section;
1246
1247 default:
1248 break;
1249 }
1250 }
1251 }
1252 else
1253 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1254
1255 return NULL;
1256}
1257
1258/* Update the got entry reference counts for the section being removed. */
1259
1260static bfd_boolean
1261elf_i386_gc_sweep_hook (bfd *abfd,
1262 struct bfd_link_info *info,
1263 asection *sec,
1264 const Elf_Internal_Rela *relocs)
1265{
1266 Elf_Internal_Shdr *symtab_hdr;
1267 struct elf_link_hash_entry **sym_hashes;
1268 bfd_signed_vma *local_got_refcounts;
1269 const Elf_Internal_Rela *rel, *relend;
1270
1271 elf_section_data (sec)->local_dynrel = NULL;
1272
1273 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1274 sym_hashes = elf_sym_hashes (abfd);
1275 local_got_refcounts = elf_local_got_refcounts (abfd);
1276
1277 relend = relocs + sec->reloc_count;
1278 for (rel = relocs; rel < relend; rel++)
1279 {
1280 unsigned long r_symndx;
1281 unsigned int r_type;
1282 struct elf_link_hash_entry *h = NULL;
1283
1284 r_symndx = ELF32_R_SYM (rel->r_info);
1285 if (r_symndx >= symtab_hdr->sh_info)
1286 {
1287 struct elf_i386_link_hash_entry *eh;
1288 struct elf_i386_dyn_relocs **pp;
1289 struct elf_i386_dyn_relocs *p;
1290
1291 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1292 while (h->root.type == bfd_link_hash_indirect
1293 || h->root.type == bfd_link_hash_warning)
1294 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1295 eh = (struct elf_i386_link_hash_entry *) h;
1296
1297 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1298 if (p->sec == sec)
1299 {
1300 /* Everything must go for SEC. */
1301 *pp = p->next;
1302 break;
1303 }
1304 }
1305
1306 r_type = ELF32_R_TYPE (rel->r_info);
1307 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1308 switch (r_type)
1309 {
1310 case R_386_TLS_LDM:
1311 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1312 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1313 break;
1314
1315 case R_386_TLS_GD:
1316 case R_386_TLS_IE_32:
1317 case R_386_TLS_IE:
1318 case R_386_TLS_GOTIE:
1319 case R_386_GOT32:
1320 if (h != NULL)
1321 {
1322 if (h->got.refcount > 0)
1323 h->got.refcount -= 1;
1324 }
1325 else if (local_got_refcounts != NULL)
1326 {
1327 if (local_got_refcounts[r_symndx] > 0)
1328 local_got_refcounts[r_symndx] -= 1;
1329 }
1330 break;
1331
1332 case R_386_32:
1333 case R_386_PC32:
1334 if (info->shared)
1335 break;
1336 /* Fall through */
1337
1338 case R_386_PLT32:
1339 if (h != NULL)
1340 {
1341 if (h->plt.refcount > 0)
1342 h->plt.refcount -= 1;
1343 }
1344 break;
1345
1346 default:
1347 break;
1348 }
1349 }
1350
1351 return TRUE;
1352}
1353
1354/* Adjust a symbol defined by a dynamic object and referenced by a
1355 regular object. The current definition is in some section of the
1356 dynamic object, but we're not including those sections. We have to
1357 change the definition to something the rest of the link can
1358 understand. */
1359
1360static bfd_boolean
1361elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1362 struct elf_link_hash_entry *h)
1363{
1364 struct elf_i386_link_hash_table *htab;
1365 asection *s;
1366 unsigned int power_of_two;
1367
1368 /* If this is a function, put it in the procedure linkage table. We
1369 will fill in the contents of the procedure linkage table later,
1370 when we know the address of the .got section. */
1371 if (h->type == STT_FUNC
1372 || h->needs_plt)
1373 {
1374 if (h->plt.refcount <= 0
1375 || SYMBOL_CALLS_LOCAL (info, h)
1376 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1377 && h->root.type == bfd_link_hash_undefweak))
1378 {
1379 /* This case can occur if we saw a PLT32 reloc in an input
1380 file, but the symbol was never referred to by a dynamic
1381 object, or if all references were garbage collected. In
1382 such a case, we don't actually need to build a procedure
1383 linkage table, and we can just do a PC32 reloc instead. */
1384 h->plt.offset = (bfd_vma) -1;
1385 h->needs_plt = 0;
1386 }
1387
1388 return TRUE;
1389 }
1390 else
1391 /* It's possible that we incorrectly decided a .plt reloc was
1392 needed for an R_386_PC32 reloc to a non-function sym in
1393 check_relocs. We can't decide accurately between function and
1394 non-function syms in check-relocs; Objects loaded later in
1395 the link may change h->type. So fix it now. */
1396 h->plt.offset = (bfd_vma) -1;
1397
1398 /* If this is a weak symbol, and there is a real definition, the
1399 processor independent code will have arranged for us to see the
1400 real definition first, and we can just use the same value. */
1401 if (h->u.weakdef != NULL)
1402 {
1403 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1404 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1405 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1406 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1407 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1408 h->non_got_ref = h->u.weakdef->non_got_ref;
1409 return TRUE;
1410 }
1411
1412 /* This is a reference to a symbol defined by a dynamic object which
1413 is not a function. */
1414
1415 /* If we are creating a shared library, we must presume that the
1416 only references to the symbol are via the global offset table.
1417 For such cases we need not do anything here; the relocations will
1418 be handled correctly by relocate_section. */
1419 if (info->shared)
1420 return TRUE;
1421
1422 /* If there are no references to this symbol that do not use the
1423 GOT, we don't need to generate a copy reloc. */
1424 if (!h->non_got_ref)
1425 return TRUE;
1426
1427 /* If -z nocopyreloc was given, we won't generate them either. */
1428 if (info->nocopyreloc)
1429 {
1430 h->non_got_ref = 0;
1431 return TRUE;
1432 }
1433
1434 htab = elf_i386_hash_table (info);
1435
1436 /* If there aren't any dynamic relocs in read-only sections, then
1437 we can keep the dynamic relocs and avoid the copy reloc. This
1438 doesn't work on VxWorks, where we can not have dynamic relocations
1439 (other than copy and jump slot relocations) in an executable. */
1440 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1441 {
1442 struct elf_i386_link_hash_entry * eh;
1443 struct elf_i386_dyn_relocs *p;
1444
1445 eh = (struct elf_i386_link_hash_entry *) h;
1446 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1447 {
1448 s = p->sec->output_section;
1449 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1450 break;
1451 }
1452
1453 if (p == NULL)
1454 {
1455 h->non_got_ref = 0;
1456 return TRUE;
1457 }
1458 }
1459
1460 /* We must allocate the symbol in our .dynbss section, which will
1461 become part of the .bss section of the executable. There will be
1462 an entry for this symbol in the .dynsym section. The dynamic
1463 object will contain position independent code, so all references
1464 from the dynamic object to this symbol will go through the global
1465 offset table. The dynamic linker will use the .dynsym entry to
1466 determine the address it must put in the global offset table, so
1467 both the dynamic object and the regular object will refer to the
1468 same memory location for the variable. */
1469
1470 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1471 copy the initial value out of the dynamic object and into the
1472 runtime process image. */
1473 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1474 {
1475 htab->srelbss->size += sizeof (Elf32_External_Rel);
1476 h->needs_copy = 1;
1477 }
1478
1479 /* We need to figure out the alignment required for this symbol. I
1480 have no idea how ELF linkers handle this. */
1481 power_of_two = bfd_log2 (h->size);
1482 if (power_of_two > 3)
1483 power_of_two = 3;
1484
1485 /* Apply the required alignment. */
1486 s = htab->sdynbss;
1487 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1488 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1489 {
1490 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1491 return FALSE;
1492 }
1493
1494 /* Define the symbol as being at this point in the section. */
1495 h->root.u.def.section = s;
1496 h->root.u.def.value = s->size;
1497
1498 /* Increment the section size to make room for the symbol. */
1499 s->size += h->size;
1500
1501 return TRUE;
1502}
1503
1504/* Allocate space in .plt, .got and associated reloc sections for
1505 dynamic relocs. */
1506
1507static bfd_boolean
1508allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1509{
1510 struct bfd_link_info *info;
1511 struct elf_i386_link_hash_table *htab;
1512 struct elf_i386_link_hash_entry *eh;
1513 struct elf_i386_dyn_relocs *p;
1514
1515 if (h->root.type == bfd_link_hash_indirect)
1516 return TRUE;
1517
1518 if (h->root.type == bfd_link_hash_warning)
1519 /* When warning symbols are created, they **replace** the "real"
1520 entry in the hash table, thus we never get to see the real
1521 symbol in a hash traversal. So look at it now. */
1522 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1523
1524 info = (struct bfd_link_info *) inf;
1525 htab = elf_i386_hash_table (info);
1526
1527 if (htab->elf.dynamic_sections_created
1528 && h->plt.refcount > 0)
1529 {
1530 /* Make sure this symbol is output as a dynamic symbol.
1531 Undefined weak syms won't yet be marked as dynamic. */
1532 if (h->dynindx == -1
1533 && !h->forced_local)
1534 {
1535 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1536 return FALSE;
1537 }
1538
1539 if (info->shared
1540 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1541 {
1542 asection *s = htab->splt;
1543
1544 /* If this is the first .plt entry, make room for the special
1545 first entry. */
1546 if (s->size == 0)
1547 s->size += PLT_ENTRY_SIZE;
1548
1549 h->plt.offset = s->size;
1550
1551 /* If this symbol is not defined in a regular file, and we are
1552 not generating a shared library, then set the symbol to this
1553 location in the .plt. This is required to make function
1554 pointers compare as equal between the normal executable and
1555 the shared library. */
1556 if (! info->shared
1557 && !h->def_regular)
1558 {
1559 h->root.u.def.section = s;
1560 h->root.u.def.value = h->plt.offset;
1561 }
1562
1563 /* Make room for this entry. */
1564 s->size += PLT_ENTRY_SIZE;
1565
1566 /* We also need to make an entry in the .got.plt section, which
1567 will be placed in the .got section by the linker script. */
1568 htab->sgotplt->size += 4;
1569
1570 /* We also need to make an entry in the .rel.plt section. */
1571 htab->srelplt->size += sizeof (Elf32_External_Rel);
1572
1573 if (htab->is_vxworks && !info->shared)
1574 {
1575 /* VxWorks has a second set of relocations for each PLT entry
1576 in executables. They go in a separate relocation section,
1577 which is processed by the kernel loader. */
1578
1579 /* There are two relocations for the initial PLT entry: an
1580 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1581 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1582
1583 if (h->plt.offset == PLT_ENTRY_SIZE)
1584 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1585
1586 /* There are two extra relocations for each subsequent PLT entry:
1587 an R_386_32 relocation for the GOT entry, and an R_386_32
1588 relocation for the PLT entry. */
1589
1590 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1591 }
1592 }
1593 else
1594 {
1595 h->plt.offset = (bfd_vma) -1;
1596 h->needs_plt = 0;
1597 }
1598 }
1599 else
1600 {
1601 h->plt.offset = (bfd_vma) -1;
1602 h->needs_plt = 0;
1603 }
1604
1605 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1606 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1607 if (h->got.refcount > 0
1608 && !info->shared
1609 && h->dynindx == -1
1610 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1611 h->got.offset = (bfd_vma) -1;
1612 else if (h->got.refcount > 0)
1613 {
1614 asection *s;
1615 bfd_boolean dyn;
1616 int tls_type = elf_i386_hash_entry(h)->tls_type;
1617
1618 /* Make sure this symbol is output as a dynamic symbol.
1619 Undefined weak syms won't yet be marked as dynamic. */
1620 if (h->dynindx == -1
1621 && !h->forced_local)
1622 {
1623 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1624 return FALSE;
1625 }
1626
1627 s = htab->sgot;
1628 h->got.offset = s->size;
1629 s->size += 4;
1630 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1631 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1632 s->size += 4;
1633 dyn = htab->elf.dynamic_sections_created;
1634 /* R_386_TLS_IE_32 needs one dynamic relocation,
1635 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1636 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1637 need two), R_386_TLS_GD needs one if local symbol and two if
1638 global. */
1639 if (tls_type == GOT_TLS_IE_BOTH)
1640 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1641 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1642 || (tls_type & GOT_TLS_IE))
1643 htab->srelgot->size += sizeof (Elf32_External_Rel);
1644 else if (tls_type == GOT_TLS_GD)
1645 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1646 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1647 || h->root.type != bfd_link_hash_undefweak)
1648 && (info->shared
1649 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1650 htab->srelgot->size += sizeof (Elf32_External_Rel);
1651 }
1652 else
1653 h->got.offset = (bfd_vma) -1;
1654
1655 eh = (struct elf_i386_link_hash_entry *) h;
1656 if (eh->dyn_relocs == NULL)
1657 return TRUE;
1658
1659 /* In the shared -Bsymbolic case, discard space allocated for
1660 dynamic pc-relative relocs against symbols which turn out to be
1661 defined in regular objects. For the normal shared case, discard
1662 space for pc-relative relocs that have become local due to symbol
1663 visibility changes. */
1664
1665 if (info->shared)
1666 {
1667 /* The only reloc that uses pc_count is R_386_PC32, which will
1668 appear on a call or on something like ".long foo - .". We
1669 want calls to protected symbols to resolve directly to the
1670 function rather than going via the plt. If people want
1671 function pointer comparisons to work as expected then they
1672 should avoid writing assembly like ".long foo - .". */
1673 if (SYMBOL_CALLS_LOCAL (info, h))
1674 {
1675 struct elf_i386_dyn_relocs **pp;
1676
1677 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1678 {
1679 p->count -= p->pc_count;
1680 p->pc_count = 0;
1681 if (p->count == 0)
1682 *pp = p->next;
1683 else
1684 pp = &p->next;
1685 }
1686 }
1687
1688 /* Also discard relocs on undefined weak syms with non-default
1689 visibility. */
1690 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1691 && h->root.type == bfd_link_hash_undefweak)
1692 eh->dyn_relocs = NULL;
1693 }
1694 else if (ELIMINATE_COPY_RELOCS)
1695 {
1696 /* For the non-shared case, discard space for relocs against
1697 symbols which turn out to need copy relocs or are not
1698 dynamic. */
1699
1700 if (!h->non_got_ref
1701 && ((h->def_dynamic
1702 && !h->def_regular)
1703 || (htab->elf.dynamic_sections_created
1704 && (h->root.type == bfd_link_hash_undefweak
1705 || h->root.type == bfd_link_hash_undefined))))
1706 {
1707 /* Make sure this symbol is output as a dynamic symbol.
1708 Undefined weak syms won't yet be marked as dynamic. */
1709 if (h->dynindx == -1
1710 && !h->forced_local)
1711 {
1712 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1713 return FALSE;
1714 }
1715
1716 /* If that succeeded, we know we'll be keeping all the
1717 relocs. */
1718 if (h->dynindx != -1)
1719 goto keep;
1720 }
1721
1722 eh->dyn_relocs = NULL;
1723
1724 keep: ;
1725 }
1726
1727 /* Finally, allocate space. */
1728 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1729 {
1730 asection *sreloc = elf_section_data (p->sec)->sreloc;
1731 sreloc->size += p->count * sizeof (Elf32_External_Rel);
1732 }
1733
1734 return TRUE;
1735}
1736
1737/* Find any dynamic relocs that apply to read-only sections. */
1738
1739static bfd_boolean
1740readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1741{
1742 struct elf_i386_link_hash_entry *eh;
1743 struct elf_i386_dyn_relocs *p;
1744
1745 if (h->root.type == bfd_link_hash_warning)
1746 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1747
1748 eh = (struct elf_i386_link_hash_entry *) h;
1749 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1750 {
1751 asection *s = p->sec->output_section;
1752
1753 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1754 {
1755 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1756
1757 info->flags |= DF_TEXTREL;
1758
1759 /* Not an error, just cut short the traversal. */
1760 return FALSE;
1761 }
1762 }
1763 return TRUE;
1764}
1765
1766/* Set the sizes of the dynamic sections. */
1767
1768static bfd_boolean
1769elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1770 struct bfd_link_info *info)
1771{
1772 struct elf_i386_link_hash_table *htab;
1773 bfd *dynobj;
1774 asection *s;
1775 bfd_boolean relocs;
1776 bfd *ibfd;
1777
1778 htab = elf_i386_hash_table (info);
1779 dynobj = htab->elf.dynobj;
1780 if (dynobj == NULL)
1781 abort ();
1782
1783 if (htab->elf.dynamic_sections_created)
1784 {
1785 /* Set the contents of the .interp section to the interpreter. */
1786 if (info->executable)
1787 {
1788 s = bfd_get_section_by_name (dynobj, ".interp");
1789 if (s == NULL)
1790 abort ();
1791 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1792 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1793 }
1794 }
1795
1796 /* Set up .got offsets for local syms, and space for local dynamic
1797 relocs. */
1798 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1799 {
1800 bfd_signed_vma *local_got;
1801 bfd_signed_vma *end_local_got;
1802 char *local_tls_type;
1803 bfd_size_type locsymcount;
1804 Elf_Internal_Shdr *symtab_hdr;
1805 asection *srel;
1806
1807 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1808 continue;
1809
1810 for (s = ibfd->sections; s != NULL; s = s->next)
1811 {
1812 struct elf_i386_dyn_relocs *p;
1813
1814 for (p = *((struct elf_i386_dyn_relocs **)
1815 &elf_section_data (s)->local_dynrel);
1816 p != NULL;
1817 p = p->next)
1818 {
1819 if (!bfd_is_abs_section (p->sec)
1820 && bfd_is_abs_section (p->sec->output_section))
1821 {
1822 /* Input section has been discarded, either because
1823 it is a copy of a linkonce section or due to
1824 linker script /DISCARD/, so we'll be discarding
1825 the relocs too. */
1826 }
1827 else if (p->count != 0)
1828 {
1829 srel = elf_section_data (p->sec)->sreloc;
1830 srel->size += p->count * sizeof (Elf32_External_Rel);
1831 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1832 info->flags |= DF_TEXTREL;
1833 }
1834 }
1835 }
1836
1837 local_got = elf_local_got_refcounts (ibfd);
1838 if (!local_got)
1839 continue;
1840
1841 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1842 locsymcount = symtab_hdr->sh_info;
1843 end_local_got = local_got + locsymcount;
1844 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1845 s = htab->sgot;
1846 srel = htab->srelgot;
1847 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1848 {
1849 if (*local_got > 0)
1850 {
1851 *local_got = s->size;
1852 s->size += 4;
1853 if (*local_tls_type == GOT_TLS_GD
1854 || *local_tls_type == GOT_TLS_IE_BOTH)
1855 s->size += 4;
1856 if (info->shared
1857 || *local_tls_type == GOT_TLS_GD
1858 || (*local_tls_type & GOT_TLS_IE))
1859 {
1860 if (*local_tls_type == GOT_TLS_IE_BOTH)
1861 srel->size += 2 * sizeof (Elf32_External_Rel);
1862 else
1863 srel->size += sizeof (Elf32_External_Rel);
1864 }
1865 }
1866 else
1867 *local_got = (bfd_vma) -1;
1868 }
1869 }
1870
1871 if (htab->tls_ldm_got.refcount > 0)
1872 {
1873 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1874 relocs. */
1875 htab->tls_ldm_got.offset = htab->sgot->size;
1876 htab->sgot->size += 8;
1877 htab->srelgot->size += sizeof (Elf32_External_Rel);
1878 }
1879 else
1880 htab->tls_ldm_got.offset = -1;
1881
1882 if (htab->is_vxworks)
1883 {
1884 /* Save the GOT and PLT symbols in the hash table for easy access.
1885 Mark them as having relocations; they might not, but we won't
1886 know for sure until we build the GOT in finish_dynamic_symbol. */
1887
1888 htab->hgot = elf_link_hash_lookup (elf_hash_table (info),
1889 "_GLOBAL_OFFSET_TABLE_",
1890 FALSE, FALSE, FALSE);
1891 if (htab->hgot)
1892 htab->hgot->indx = -2;
1893 htab->hplt = elf_link_hash_lookup (elf_hash_table (info),
1894 "_PROCEDURE_LINKAGE_TABLE_",
1895 FALSE, FALSE, FALSE);
1896 if (htab->hplt)
1897 htab->hplt->indx = -2;
1898
1899 if (htab->is_vxworks && htab->hplt && htab->splt->flags & SEC_CODE)
1900 htab->hplt->type = STT_FUNC;
1901 }
1902
1903 /* Allocate global sym .plt and .got entries, and space for global
1904 sym dynamic relocs. */
1905 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1906
1907 /* We now have determined the sizes of the various dynamic sections.
1908 Allocate memory for them. */
1909 relocs = FALSE;
1910 for (s = dynobj->sections; s != NULL; s = s->next)
1911 {
1912 bfd_boolean strip_section = TRUE;
1913
1914 if ((s->flags & SEC_LINKER_CREATED) == 0)
1915 continue;
1916
1917 if (s == htab->splt
1918 || s == htab->sgot
1919 || s == htab->sgotplt
1920 || s == htab->sdynbss)
1921 {
1922 /* Strip this section if we don't need it; see the
1923 comment below. */
1924 /* We'd like to strip these sections if they aren't needed, but if
1925 we've exported dynamic symbols from them we must leave them.
1926 It's too late to tell BFD to get rid of the symbols. */
1927
1928 if (htab->hplt != NULL)
1929 strip_section = FALSE;
1930 }
1931 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1932 {
1933 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
1934 relocs = TRUE;
1935
1936 /* We use the reloc_count field as a counter if we need
1937 to copy relocs into the output file. */
1938 s->reloc_count = 0;
1939 }
1940 else
1941 {
1942 /* It's not one of our sections, so don't allocate space. */
1943 continue;
1944 }
1945
1946 if (s->size == 0 && strip_section)
1947 {
1948 /* If we don't need this section, strip it from the
1949 output file. This is mostly to handle .rel.bss and
1950 .rel.plt. We must create both sections in
1951 create_dynamic_sections, because they must be created
1952 before the linker maps input sections to output
1953 sections. The linker does that before
1954 adjust_dynamic_symbol is called, and it is that
1955 function which decides whether anything needs to go
1956 into these sections. */
1957
1958 s->flags |= SEC_EXCLUDE;
1959 continue;
1960 }
1961
1962 /* Allocate memory for the section contents. We use bfd_zalloc
1963 here in case unused entries are not reclaimed before the
1964 section's contents are written out. This should not happen,
1965 but this way if it does, we get a R_386_NONE reloc instead
1966 of garbage. */
1967 s->contents = bfd_zalloc (dynobj, s->size);
1968 if (s->contents == NULL)
1969 return FALSE;
1970 }
1971
1972 if (htab->elf.dynamic_sections_created)
1973 {
1974 /* Add some entries to the .dynamic section. We fill in the
1975 values later, in elf_i386_finish_dynamic_sections, but we
1976 must add the entries now so that we get the correct size for
1977 the .dynamic section. The DT_DEBUG entry is filled in by the
1978 dynamic linker and used by the debugger. */
1979#define add_dynamic_entry(TAG, VAL) \
1980 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1981
1982 if (info->executable)
1983 {
1984 if (!add_dynamic_entry (DT_DEBUG, 0))
1985 return FALSE;
1986 }
1987
1988 if (htab->splt->size != 0)
1989 {
1990 if (!add_dynamic_entry (DT_PLTGOT, 0)
1991 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1992 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1993 || !add_dynamic_entry (DT_JMPREL, 0))
1994 return FALSE;
1995 }
1996
1997 if (relocs)
1998 {
1999 if (!add_dynamic_entry (DT_REL, 0)
2000 || !add_dynamic_entry (DT_RELSZ, 0)
2001 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2002 return FALSE;
2003
2004 /* If any dynamic relocs apply to a read-only section,
2005 then we need a DT_TEXTREL entry. */
2006 if ((info->flags & DF_TEXTREL) == 0)
2007 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2008 (PTR) info);
2009
2010 if ((info->flags & DF_TEXTREL) != 0)
2011 {
2012 if (!add_dynamic_entry (DT_TEXTREL, 0))
2013 return FALSE;
2014 }
2015 }
2016 }
2017#undef add_dynamic_entry
2018
2019 return TRUE;
2020}
2021
2022/* Set the correct type for an x86 ELF section. We do this by the
2023 section name, which is a hack, but ought to work. */
2024
2025static bfd_boolean
2026elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2027 Elf_Internal_Shdr *hdr,
2028 asection *sec)
2029{
2030 register const char *name;
2031
2032 name = bfd_get_section_name (abfd, sec);
2033
2034 /* This is an ugly, but unfortunately necessary hack that is
2035 needed when producing EFI binaries on x86. It tells
2036 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2037 containing ELF relocation info. We need this hack in order to
2038 be able to generate ELF binaries that can be translated into
2039 EFI applications (which are essentially COFF objects). Those
2040 files contain a COFF ".reloc" section inside an ELFNN object,
2041 which would normally cause BFD to segfault because it would
2042 attempt to interpret this section as containing relocation
2043 entries for section "oc". With this hack enabled, ".reloc"
2044 will be treated as a normal data section, which will avoid the
2045 segfault. However, you won't be able to create an ELFNN binary
2046 with a section named "oc" that needs relocations, but that's
2047 the kind of ugly side-effects you get when detecting section
2048 types based on their names... In practice, this limitation is
2049 unlikely to bite. */
2050 if (strcmp (name, ".reloc") == 0)
2051 hdr->sh_type = SHT_PROGBITS;
2052
2053 return TRUE;
2054}
2055
2056/* Return the base VMA address which should be subtracted from real addresses
2057 when resolving @dtpoff relocation.
2058 This is PT_TLS segment p_vaddr. */
2059
2060static bfd_vma
2061dtpoff_base (struct bfd_link_info *info)
2062{
2063 /* If tls_sec is NULL, we should have signalled an error already. */
2064 if (elf_hash_table (info)->tls_sec == NULL)
2065 return 0;
2066 return elf_hash_table (info)->tls_sec->vma;
2067}
2068
2069/* Return the relocation value for @tpoff relocation
2070 if STT_TLS virtual address is ADDRESS. */
2071
2072static bfd_vma
2073tpoff (struct bfd_link_info *info, bfd_vma address)
2074{
2075 struct elf_link_hash_table *htab = elf_hash_table (info);
2076
2077 /* If tls_sec is NULL, we should have signalled an error already. */
2078 if (htab->tls_sec == NULL)
2079 return 0;
2080 return htab->tls_size + htab->tls_sec->vma - address;
2081}
2082
2083/* Relocate an i386 ELF section. */
2084
2085static bfd_boolean
2086elf_i386_relocate_section (bfd *output_bfd,
2087 struct bfd_link_info *info,
2088 bfd *input_bfd,
2089 asection *input_section,
2090 bfd_byte *contents,
2091 Elf_Internal_Rela *relocs,
2092 Elf_Internal_Sym *local_syms,
2093 asection **local_sections)
2094{
2095 struct elf_i386_link_hash_table *htab;
2096 Elf_Internal_Shdr *symtab_hdr;
2097 struct elf_link_hash_entry **sym_hashes;
2098 bfd_vma *local_got_offsets;
2099 Elf_Internal_Rela *rel;
2100 Elf_Internal_Rela *relend;
2101
2102 htab = elf_i386_hash_table (info);
2103 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2104 sym_hashes = elf_sym_hashes (input_bfd);
2105 local_got_offsets = elf_local_got_offsets (input_bfd);
2106
2107 rel = relocs;
2108 relend = relocs + input_section->reloc_count;
2109 for (; rel < relend; rel++)
2110 {
2111 unsigned int r_type;
2112 reloc_howto_type *howto;
2113 unsigned long r_symndx;
2114 struct elf_link_hash_entry *h;
2115 Elf_Internal_Sym *sym;
2116 asection *sec;
2117 bfd_vma off;
2118 bfd_vma relocation;
2119 bfd_boolean unresolved_reloc;
2120 bfd_reloc_status_type r;
2121 unsigned int indx;
2122 int tls_type;
2123
2124 r_type = ELF32_R_TYPE (rel->r_info);
2125 if (r_type == R_386_GNU_VTINHERIT
2126 || r_type == R_386_GNU_VTENTRY)
2127 continue;
2128
2129 if ((indx = r_type) >= R_386_standard
2130 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2131 >= R_386_ext - R_386_standard)
2132 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2133 >= R_386_tls - R_386_ext))
2134 {
2135 (*_bfd_error_handler)
2136 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2137 input_bfd, input_section, r_type);
2138 bfd_set_error (bfd_error_bad_value);
2139 return FALSE;
2140 }
2141 howto = elf_howto_table + indx;
2142
2143 r_symndx = ELF32_R_SYM (rel->r_info);
2144
2145 if (info->relocatable)
2146 {
2147 bfd_vma val;
2148 bfd_byte *where;
2149
2150 /* This is a relocatable link. We don't have to change
2151 anything, unless the reloc is against a section symbol,
2152 in which case we have to adjust according to where the
2153 section symbol winds up in the output section. */
2154 if (r_symndx >= symtab_hdr->sh_info)
2155 continue;
2156
2157 sym = local_syms + r_symndx;
2158 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2159 continue;
2160
2161 sec = local_sections[r_symndx];
2162 val = sec->output_offset;
2163 if (val == 0)
2164 continue;
2165
2166 where = contents + rel->r_offset;
2167 switch (howto->size)
2168 {
2169 /* FIXME: overflow checks. */
2170 case 0:
2171 val += bfd_get_8 (input_bfd, where);
2172 bfd_put_8 (input_bfd, val, where);
2173 break;
2174 case 1:
2175 val += bfd_get_16 (input_bfd, where);
2176 bfd_put_16 (input_bfd, val, where);
2177 break;
2178 case 2:
2179 val += bfd_get_32 (input_bfd, where);
2180 bfd_put_32 (input_bfd, val, where);
2181 break;
2182 default:
2183 abort ();
2184 }
2185 continue;
2186 }
2187
2188 /* This is a final link. */
2189 h = NULL;
2190 sym = NULL;
2191 sec = NULL;
2192 unresolved_reloc = FALSE;
2193 if (r_symndx < symtab_hdr->sh_info)
2194 {
2195 sym = local_syms + r_symndx;
2196 sec = local_sections[r_symndx];
2197 relocation = (sec->output_section->vma
2198 + sec->output_offset
2199 + sym->st_value);
2200 if ((sec->flags & SEC_MERGE)
2201 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2202 {
2203 asection *msec;
2204 bfd_vma addend;
2205 bfd_byte *where = contents + rel->r_offset;
2206
2207 switch (howto->size)
2208 {
2209 case 0:
2210 addend = bfd_get_8 (input_bfd, where);
2211 if (howto->pc_relative)
2212 {
2213 addend = (addend ^ 0x80) - 0x80;
2214 addend += 1;
2215 }
2216 break;
2217 case 1:
2218 addend = bfd_get_16 (input_bfd, where);
2219 if (howto->pc_relative)
2220 {
2221 addend = (addend ^ 0x8000) - 0x8000;
2222 addend += 2;
2223 }
2224 break;
2225 case 2:
2226 addend = bfd_get_32 (input_bfd, where);
2227 if (howto->pc_relative)
2228 {
2229 addend = (addend ^ 0x80000000) - 0x80000000;
2230 addend += 4;
2231 }
2232 break;
2233 default:
2234 abort ();
2235 }
2236
2237 msec = sec;
2238 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2239 addend -= relocation;
2240 addend += msec->output_section->vma + msec->output_offset;
2241
2242 switch (howto->size)
2243 {
2244 case 0:
2245 /* FIXME: overflow checks. */
2246 if (howto->pc_relative)
2247 addend -= 1;
2248 bfd_put_8 (input_bfd, addend, where);
2249 break;
2250 case 1:
2251 if (howto->pc_relative)
2252 addend -= 2;
2253 bfd_put_16 (input_bfd, addend, where);
2254 break;
2255 case 2:
2256 if (howto->pc_relative)
2257 addend -= 4;
2258 bfd_put_32 (input_bfd, addend, where);
2259 break;
2260 }
2261 }
2262 }
2263 else
2264 {
2265 bfd_boolean warned;
2266
2267 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2268 r_symndx, symtab_hdr, sym_hashes,
2269 h, sec, relocation,
2270 unresolved_reloc, warned);
2271 }
2272
2273 switch (r_type)
2274 {
2275 case R_386_GOT32:
2276 /* Relocation is to the entry for this symbol in the global
2277 offset table. */
2278 if (htab->sgot == NULL)
2279 abort ();
2280
2281 if (h != NULL)
2282 {
2283 bfd_boolean dyn;
2284
2285 off = h->got.offset;
2286 dyn = htab->elf.dynamic_sections_created;
2287 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2288 || (info->shared
2289 && SYMBOL_REFERENCES_LOCAL (info, h))
2290 || (ELF_ST_VISIBILITY (h->other)
2291 && h->root.type == bfd_link_hash_undefweak))
2292 {
2293 /* This is actually a static link, or it is a
2294 -Bsymbolic link and the symbol is defined
2295 locally, or the symbol was forced to be local
2296 because of a version file. We must initialize
2297 this entry in the global offset table. Since the
2298 offset must always be a multiple of 4, we use the
2299 least significant bit to record whether we have
2300 initialized it already.
2301
2302 When doing a dynamic link, we create a .rel.got
2303 relocation entry to initialize the value. This
2304 is done in the finish_dynamic_symbol routine. */
2305 if ((off & 1) != 0)
2306 off &= ~1;
2307 else
2308 {
2309 bfd_put_32 (output_bfd, relocation,
2310 htab->sgot->contents + off);
2311 h->got.offset |= 1;
2312 }
2313 }
2314 else
2315 unresolved_reloc = FALSE;
2316 }
2317 else
2318 {
2319 if (local_got_offsets == NULL)
2320 abort ();
2321
2322 off = local_got_offsets[r_symndx];
2323
2324 /* The offset must always be a multiple of 4. We use
2325 the least significant bit to record whether we have
2326 already generated the necessary reloc. */
2327 if ((off & 1) != 0)
2328 off &= ~1;
2329 else
2330 {
2331 bfd_put_32 (output_bfd, relocation,
2332 htab->sgot->contents + off);
2333
2334 if (info->shared)
2335 {
2336 asection *s;
2337 Elf_Internal_Rela outrel;
2338 bfd_byte *loc;
2339
2340 s = htab->srelgot;
2341 if (s == NULL)
2342 abort ();
2343
2344 outrel.r_offset = (htab->sgot->output_section->vma
2345 + htab->sgot->output_offset
2346 + off);
2347 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2348 loc = s->contents;
2349 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2350 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2351 }
2352
2353 local_got_offsets[r_symndx] |= 1;
2354 }
2355 }
2356
2357 if (off >= (bfd_vma) -2)
2358 abort ();
2359
2360 relocation = htab->sgot->output_section->vma
2361 + htab->sgot->output_offset + off
2362 - htab->sgotplt->output_section->vma
2363 - htab->sgotplt->output_offset;
2364 break;
2365
2366 case R_386_GOTOFF:
2367 /* Relocation is relative to the start of the global offset
2368 table. */
2369
2370 /* Check to make sure it isn't a protected function symbol
2371 for shared library since it may not be local when used
2372 as function address. */
2373 if (info->shared
2374 && !info->executable
2375 && h
2376 && h->def_regular
2377 && h->type == STT_FUNC
2378 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2379 {
2380 (*_bfd_error_handler)
2381 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2382 input_bfd, h->root.root.string);
2383 bfd_set_error (bfd_error_bad_value);
2384 return FALSE;
2385 }
2386
2387 /* Note that sgot is not involved in this
2388 calculation. We always want the start of .got.plt. If we
2389 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2390 permitted by the ABI, we might have to change this
2391 calculation. */
2392 relocation -= htab->sgotplt->output_section->vma
2393 + htab->sgotplt->output_offset;
2394 break;
2395
2396 case R_386_GOTPC:
2397 /* Use global offset table as symbol value. */
2398 relocation = htab->sgotplt->output_section->vma
2399 + htab->sgotplt->output_offset;
2400 unresolved_reloc = FALSE;
2401 break;
2402
2403 case R_386_PLT32:
2404 /* Relocation is to the entry for this symbol in the
2405 procedure linkage table. */
2406
2407 /* Resolve a PLT32 reloc against a local symbol directly,
2408 without using the procedure linkage table. */
2409 if (h == NULL)
2410 break;
2411
2412 if (h->plt.offset == (bfd_vma) -1
2413 || htab->splt == NULL)
2414 {
2415 /* We didn't make a PLT entry for this symbol. This
2416 happens when statically linking PIC code, or when
2417 using -Bsymbolic. */
2418 break;
2419 }
2420
2421 relocation = (htab->splt->output_section->vma
2422 + htab->splt->output_offset
2423 + h->plt.offset);
2424 unresolved_reloc = FALSE;
2425 break;
2426
2427 case R_386_32:
2428 case R_386_PC32:
2429 /* r_symndx will be zero only for relocs against symbols
2430 from removed linkonce sections, or sections discarded by
2431 a linker script. */
2432 if (r_symndx == 0)
2433 {
2434 /* Zero the section contents. eh_frame generated by old
2435 versions of gcc isn't edited by elf-eh-frame.c, so
2436 FDEs for discarded linkonce functions might remain.
2437 Putting zeros here will zero such FDE's address range.
2438 This is a hint to unwinders and other consumers of
2439 exception handling info that the FDE is invalid. */
2440 bfd_put_32 (input_bfd, 0, contents + rel->r_offset);
2441 break;
2442 }
2443
2444 if ((input_section->flags & SEC_ALLOC) == 0)
2445 break;
2446
2447 if ((info->shared
2448 && (h == NULL
2449 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2450 || h->root.type != bfd_link_hash_undefweak)
2451 && (r_type != R_386_PC32
2452 || !SYMBOL_CALLS_LOCAL (info, h)))
2453 || (ELIMINATE_COPY_RELOCS
2454 && !info->shared
2455 && h != NULL
2456 && h->dynindx != -1
2457 && !h->non_got_ref
2458 && ((h->def_dynamic
2459 && !h->def_regular)
2460 || h->root.type == bfd_link_hash_undefweak
2461 || h->root.type == bfd_link_hash_undefined)))
2462 {
2463 Elf_Internal_Rela outrel;
2464 bfd_byte *loc;
2465 bfd_boolean skip, relocate;
2466 asection *sreloc;
2467
2468 /* When generating a shared object, these relocations
2469 are copied into the output file to be resolved at run
2470 time. */
2471
2472 skip = FALSE;
2473 relocate = FALSE;
2474
2475 outrel.r_offset =
2476 _bfd_elf_section_offset (output_bfd, info, input_section,
2477 rel->r_offset);
2478 if (outrel.r_offset == (bfd_vma) -1)
2479 skip = TRUE;
2480 else if (outrel.r_offset == (bfd_vma) -2)
2481 skip = TRUE, relocate = TRUE;
2482 outrel.r_offset += (input_section->output_section->vma
2483 + input_section->output_offset);
2484
2485 if (skip)
2486 memset (&outrel, 0, sizeof outrel);
2487 else if (h != NULL
2488 && h->dynindx != -1
2489 && (r_type == R_386_PC32
2490 || !info->shared
2491 || !info->symbolic
2492 || !h->def_regular))
2493 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2494 else
2495 {
2496 /* This symbol is local, or marked to become local. */
2497 relocate = TRUE;
2498 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2499 }
2500
2501 sreloc = elf_section_data (input_section)->sreloc;
2502 if (sreloc == NULL)
2503 abort ();
2504
2505 loc = sreloc->contents;
2506 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2507 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2508
2509 /* If this reloc is against an external symbol, we do
2510 not want to fiddle with the addend. Otherwise, we
2511 need to include the symbol value so that it becomes
2512 an addend for the dynamic reloc. */
2513 if (! relocate)
2514 continue;
2515 }
2516 break;
2517
2518 case R_386_TLS_IE:
2519 if (info->shared)
2520 {
2521 Elf_Internal_Rela outrel;
2522 bfd_byte *loc;
2523 asection *sreloc;
2524
2525 outrel.r_offset = rel->r_offset
2526 + input_section->output_section->vma
2527 + input_section->output_offset;
2528 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2529 sreloc = elf_section_data (input_section)->sreloc;
2530 if (sreloc == NULL)
2531 abort ();
2532 loc = sreloc->contents;
2533 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2534 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2535 }
2536 /* Fall through */
2537
2538 case R_386_TLS_GD:
2539 case R_386_TLS_IE_32:
2540 case R_386_TLS_GOTIE:
2541 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2542 tls_type = GOT_UNKNOWN;
2543 if (h == NULL && local_got_offsets)
2544 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2545 else if (h != NULL)
2546 {
2547 tls_type = elf_i386_hash_entry(h)->tls_type;
2548 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2549 r_type = R_386_TLS_LE_32;
2550 }
2551 if (tls_type == GOT_TLS_IE)
2552 tls_type = GOT_TLS_IE_NEG;
2553 if (r_type == R_386_TLS_GD)
2554 {
2555 if (tls_type == GOT_TLS_IE_POS)
2556 r_type = R_386_TLS_GOTIE;
2557 else if (tls_type & GOT_TLS_IE)
2558 r_type = R_386_TLS_IE_32;
2559 }
2560
2561 if (r_type == R_386_TLS_LE_32)
2562 {
2563 BFD_ASSERT (! unresolved_reloc);
2564 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2565 {
2566 unsigned int val, type;
2567 bfd_vma roff;
2568
2569 /* GD->LE transition. */
2570 BFD_ASSERT (rel->r_offset >= 2);
2571 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2572 BFD_ASSERT (type == 0x8d || type == 0x04);
2573 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2574 BFD_ASSERT (bfd_get_8 (input_bfd,
2575 contents + rel->r_offset + 4)
2576 == 0xe8);
2577 BFD_ASSERT (rel + 1 < relend);
2578 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2579 roff = rel->r_offset + 5;
2580 val = bfd_get_8 (input_bfd,
2581 contents + rel->r_offset - 1);
2582 if (type == 0x04)
2583 {
2584 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2585 Change it into:
2586 movl %gs:0, %eax; subl $foo@tpoff, %eax
2587 (6 byte form of subl). */
2588 BFD_ASSERT (rel->r_offset >= 3);
2589 BFD_ASSERT (bfd_get_8 (input_bfd,
2590 contents + rel->r_offset - 3)
2591 == 0x8d);
2592 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2593 memcpy (contents + rel->r_offset - 3,
2594 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2595 }
2596 else
2597 {
2598 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2599 if (rel->r_offset + 10 <= input_section->size
2600 && bfd_get_8 (input_bfd,
2601 contents + rel->r_offset + 9) == 0x90)
2602 {
2603 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2604 Change it into:
2605 movl %gs:0, %eax; subl $foo@tpoff, %eax
2606 (6 byte form of subl). */
2607 memcpy (contents + rel->r_offset - 2,
2608 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2609 roff = rel->r_offset + 6;
2610 }
2611 else
2612 {
2613 /* leal foo(%reg), %eax; call ___tls_get_addr
2614 Change it into:
2615 movl %gs:0, %eax; subl $foo@tpoff, %eax
2616 (5 byte form of subl). */
2617 memcpy (contents + rel->r_offset - 2,
2618 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2619 }
2620 }
2621 bfd_put_32 (output_bfd, tpoff (info, relocation),
2622 contents + roff);
2623 /* Skip R_386_PLT32. */
2624 rel++;
2625 continue;
2626 }
2627 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2628 {
2629 unsigned int val, type;
2630
2631 /* IE->LE transition:
2632 Originally it can be one of:
2633 movl foo, %eax
2634 movl foo, %reg
2635 addl foo, %reg
2636 We change it into:
2637 movl $foo, %eax
2638 movl $foo, %reg
2639 addl $foo, %reg. */
2640 BFD_ASSERT (rel->r_offset >= 1);
2641 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2642 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2643 if (val == 0xa1)
2644 {
2645 /* movl foo, %eax. */
2646 bfd_put_8 (output_bfd, 0xb8,
2647 contents + rel->r_offset - 1);
2648 }
2649 else
2650 {
2651 BFD_ASSERT (rel->r_offset >= 2);
2652 type = bfd_get_8 (input_bfd,
2653 contents + rel->r_offset - 2);
2654 switch (type)
2655 {
2656 case 0x8b:
2657 /* movl */
2658 BFD_ASSERT ((val & 0xc7) == 0x05);
2659 bfd_put_8 (output_bfd, 0xc7,
2660 contents + rel->r_offset - 2);
2661 bfd_put_8 (output_bfd,
2662 0xc0 | ((val >> 3) & 7),
2663 contents + rel->r_offset - 1);
2664 break;
2665 case 0x03:
2666 /* addl */
2667 BFD_ASSERT ((val & 0xc7) == 0x05);
2668 bfd_put_8 (output_bfd, 0x81,
2669 contents + rel->r_offset - 2);
2670 bfd_put_8 (output_bfd,
2671 0xc0 | ((val >> 3) & 7),
2672 contents + rel->r_offset - 1);
2673 break;
2674 default:
2675 BFD_FAIL ();
2676 break;
2677 }
2678 }
2679 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2680 contents + rel->r_offset);
2681 continue;
2682 }
2683 else
2684 {
2685 unsigned int val, type;
2686
2687 /* {IE_32,GOTIE}->LE transition:
2688 Originally it can be one of:
2689 subl foo(%reg1), %reg2
2690 movl foo(%reg1), %reg2
2691 addl foo(%reg1), %reg2
2692 We change it into:
2693 subl $foo, %reg2
2694 movl $foo, %reg2 (6 byte form)
2695 addl $foo, %reg2. */
2696 BFD_ASSERT (rel->r_offset >= 2);
2697 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2698 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2699 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2700 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2701 if (type == 0x8b)
2702 {
2703 /* movl */
2704 bfd_put_8 (output_bfd, 0xc7,
2705 contents + rel->r_offset - 2);
2706 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2707 contents + rel->r_offset - 1);
2708 }
2709 else if (type == 0x2b)
2710 {
2711 /* subl */
2712 bfd_put_8 (output_bfd, 0x81,
2713 contents + rel->r_offset - 2);
2714 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2715 contents + rel->r_offset - 1);
2716 }
2717 else if (type == 0x03)
2718 {
2719 /* addl */
2720 bfd_put_8 (output_bfd, 0x81,
2721 contents + rel->r_offset - 2);
2722 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2723 contents + rel->r_offset - 1);
2724 }
2725 else
2726 BFD_FAIL ();
2727 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2728 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2729 contents + rel->r_offset);
2730 else
2731 bfd_put_32 (output_bfd, tpoff (info, relocation),
2732 contents + rel->r_offset);
2733 continue;
2734 }
2735 }
2736
2737 if (htab->sgot == NULL)
2738 abort ();
2739
2740 if (h != NULL)
2741 off = h->got.offset;
2742 else
2743 {
2744 if (local_got_offsets == NULL)
2745 abort ();
2746
2747 off = local_got_offsets[r_symndx];
2748 }
2749
2750 if ((off & 1) != 0)
2751 off &= ~1;
2752 else
2753 {
2754 Elf_Internal_Rela outrel;
2755 bfd_byte *loc;
2756 int dr_type, indx;
2757
2758 if (htab->srelgot == NULL)
2759 abort ();
2760
2761 outrel.r_offset = (htab->sgot->output_section->vma
2762 + htab->sgot->output_offset + off);
2763
2764 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2765 if (r_type == R_386_TLS_GD)
2766 dr_type = R_386_TLS_DTPMOD32;
2767 else if (tls_type == GOT_TLS_IE_POS)
2768 dr_type = R_386_TLS_TPOFF;
2769 else
2770 dr_type = R_386_TLS_TPOFF32;
2771 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2772 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2773 htab->sgot->contents + off);
2774 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2775 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2776 htab->sgot->contents + off);
2777 else
2778 bfd_put_32 (output_bfd, 0,
2779 htab->sgot->contents + off);
2780 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2781 loc = htab->srelgot->contents;
2782 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2783 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2784
2785 if (r_type == R_386_TLS_GD)
2786 {
2787 if (indx == 0)
2788 {
2789 BFD_ASSERT (! unresolved_reloc);
2790 bfd_put_32 (output_bfd,
2791 relocation - dtpoff_base (info),
2792 htab->sgot->contents + off + 4);
2793 }
2794 else
2795 {
2796 bfd_put_32 (output_bfd, 0,
2797 htab->sgot->contents + off + 4);
2798 outrel.r_info = ELF32_R_INFO (indx,
2799 R_386_TLS_DTPOFF32);
2800 outrel.r_offset += 4;
2801 htab->srelgot->reloc_count++;
2802 loc += sizeof (Elf32_External_Rel);
2803 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2804 }
2805 }
2806 else if (tls_type == GOT_TLS_IE_BOTH)
2807 {
2808 bfd_put_32 (output_bfd,
2809 indx == 0 ? relocation - dtpoff_base (info) : 0,
2810 htab->sgot->contents + off + 4);
2811 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2812 outrel.r_offset += 4;
2813 htab->srelgot->reloc_count++;
2814 loc += sizeof (Elf32_External_Rel);
2815 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2816 }
2817
2818 if (h != NULL)
2819 h->got.offset |= 1;
2820 else
2821 local_got_offsets[r_symndx] |= 1;
2822 }
2823
2824 if (off >= (bfd_vma) -2)
2825 abort ();
2826 if (r_type == ELF32_R_TYPE (rel->r_info))
2827 {
2828 bfd_vma g_o_t = htab->sgotplt->output_section->vma
2829 + htab->sgotplt->output_offset;
2830 relocation = htab->sgot->output_section->vma
2831 + htab->sgot->output_offset + off - g_o_t;
2832 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2833 && tls_type == GOT_TLS_IE_BOTH)
2834 relocation += 4;
2835 if (r_type == R_386_TLS_IE)
2836 relocation += g_o_t;
2837 unresolved_reloc = FALSE;
2838 }
2839 else
2840 {
2841 unsigned int val, type;
2842 bfd_vma roff;
2843
2844 /* GD->IE transition. */
2845 BFD_ASSERT (rel->r_offset >= 2);
2846 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2847 BFD_ASSERT (type == 0x8d || type == 0x04);
2848 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2849 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2850 == 0xe8);
2851 BFD_ASSERT (rel + 1 < relend);
2852 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2853 roff = rel->r_offset - 3;
2854 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2855 if (type == 0x04)
2856 {
2857 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2858 Change it into:
2859 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2860 BFD_ASSERT (rel->r_offset >= 3);
2861 BFD_ASSERT (bfd_get_8 (input_bfd,
2862 contents + rel->r_offset - 3)
2863 == 0x8d);
2864 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2865 val >>= 3;
2866 }
2867 else
2868 {
2869 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2870 Change it into:
2871 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2872 BFD_ASSERT (rel->r_offset + 10 <= input_section->size);
2873 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2874 BFD_ASSERT (bfd_get_8 (input_bfd,
2875 contents + rel->r_offset + 9)
2876 == 0x90);
2877 roff = rel->r_offset - 2;
2878 }
2879 memcpy (contents + roff,
2880 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2881 contents[roff + 7] = 0x80 | (val & 7);
2882 /* If foo is used only with foo@gotntpoff(%reg) and
2883 foo@indntpoff, but not with foo@gottpoff(%reg), change
2884 subl $foo@gottpoff(%reg), %eax
2885 into:
2886 addl $foo@gotntpoff(%reg), %eax. */
2887 if (r_type == R_386_TLS_GOTIE)
2888 {
2889 contents[roff + 6] = 0x03;
2890 if (tls_type == GOT_TLS_IE_BOTH)
2891 off += 4;
2892 }
2893 bfd_put_32 (output_bfd,
2894 htab->sgot->output_section->vma
2895 + htab->sgot->output_offset + off
2896 - htab->sgotplt->output_section->vma
2897 - htab->sgotplt->output_offset,
2898 contents + roff + 8);
2899 /* Skip R_386_PLT32. */
2900 rel++;
2901 continue;
2902 }
2903 break;
2904
2905 case R_386_TLS_LDM:
2906 if (! info->shared)
2907 {
2908 unsigned int val;
2909
2910 /* LD->LE transition:
2911 Ensure it is:
2912 leal foo(%reg), %eax; call ___tls_get_addr.
2913 We change it into:
2914 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2915 BFD_ASSERT (rel->r_offset >= 2);
2916 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2917 == 0x8d);
2918 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2919 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2920 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2921 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2922 == 0xe8);
2923 BFD_ASSERT (rel + 1 < relend);
2924 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2925 memcpy (contents + rel->r_offset - 2,
2926 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2927 /* Skip R_386_PLT32. */
2928 rel++;
2929 continue;
2930 }
2931
2932 if (htab->sgot == NULL)
2933 abort ();
2934
2935 off = htab->tls_ldm_got.offset;
2936 if (off & 1)
2937 off &= ~1;
2938 else
2939 {
2940 Elf_Internal_Rela outrel;
2941 bfd_byte *loc;
2942
2943 if (htab->srelgot == NULL)
2944 abort ();
2945
2946 outrel.r_offset = (htab->sgot->output_section->vma
2947 + htab->sgot->output_offset + off);
2948
2949 bfd_put_32 (output_bfd, 0,
2950 htab->sgot->contents + off);
2951 bfd_put_32 (output_bfd, 0,
2952 htab->sgot->contents + off + 4);
2953 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2954 loc = htab->srelgot->contents;
2955 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2956 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2957 htab->tls_ldm_got.offset |= 1;
2958 }
2959 relocation = htab->sgot->output_section->vma
2960 + htab->sgot->output_offset + off
2961 - htab->sgotplt->output_section->vma
2962 - htab->sgotplt->output_offset;
2963 unresolved_reloc = FALSE;
2964 break;
2965
2966 case R_386_TLS_LDO_32:
2967 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2968 relocation -= dtpoff_base (info);
2969 else
2970 /* When converting LDO to LE, we must negate. */
2971 relocation = -tpoff (info, relocation);
2972 break;
2973
2974 case R_386_TLS_LE_32:
2975 case R_386_TLS_LE:
2976 if (info->shared)
2977 {
2978 Elf_Internal_Rela outrel;
2979 asection *sreloc;
2980 bfd_byte *loc;
2981 int indx;
2982
2983 outrel.r_offset = rel->r_offset
2984 + input_section->output_section->vma
2985 + input_section->output_offset;
2986 if (h != NULL && h->dynindx != -1)
2987 indx = h->dynindx;
2988 else
2989 indx = 0;
2990 if (r_type == R_386_TLS_LE_32)
2991 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2992 else
2993 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2994 sreloc = elf_section_data (input_section)->sreloc;
2995 if (sreloc == NULL)
2996 abort ();
2997 loc = sreloc->contents;
2998 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2999 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3000 if (indx)
3001 continue;
3002 else if (r_type == R_386_TLS_LE_32)
3003 relocation = dtpoff_base (info) - relocation;
3004 else
3005 relocation -= dtpoff_base (info);
3006 }
3007 else if (r_type == R_386_TLS_LE_32)
3008 relocation = tpoff (info, relocation);
3009 else
3010 relocation = -tpoff (info, relocation);
3011 break;
3012
3013 default:
3014 break;
3015 }
3016
3017 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3018 because such sections are not SEC_ALLOC and thus ld.so will
3019 not process them. */
3020 if (unresolved_reloc
3021 && !((input_section->flags & SEC_DEBUGGING) != 0
3022 && h->def_dynamic))
3023 {
3024 (*_bfd_error_handler)
3025 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
3026 input_bfd,
3027 input_section,
3028 (long) rel->r_offset,
3029 h->root.root.string);
3030 return FALSE;
3031 }
3032
3033 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3034 contents, rel->r_offset,
3035 relocation, 0);
3036
3037 if (r != bfd_reloc_ok)
3038 {
3039 const char *name;
3040
3041 if (h != NULL)
3042 name = h->root.root.string;
3043 else
3044 {
3045 name = bfd_elf_string_from_elf_section (input_bfd,
3046 symtab_hdr->sh_link,
3047 sym->st_name);
3048 if (name == NULL)
3049 return FALSE;
3050 if (*name == '\0')
3051 name = bfd_section_name (input_bfd, sec);
3052 }
3053
3054 if (r == bfd_reloc_overflow)
3055 {
3056 if (! ((*info->callbacks->reloc_overflow)
3057 (info, (h ? &h->root : NULL), name, howto->name,
3058 (bfd_vma) 0, input_bfd, input_section,
3059 rel->r_offset)))
3060 return FALSE;
3061 }
3062 else
3063 {
3064 (*_bfd_error_handler)
3065 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3066 input_bfd, input_section,
3067 (long) rel->r_offset, name, (int) r);
3068 return FALSE;
3069 }
3070 }
3071 }
3072
3073 return TRUE;
3074}
3075
3076/* Finish up dynamic symbol handling. We set the contents of various
3077 dynamic sections here. */
3078
3079static bfd_boolean
3080elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3081 struct bfd_link_info *info,
3082 struct elf_link_hash_entry *h,
3083 Elf_Internal_Sym *sym)
3084{
3085 struct elf_i386_link_hash_table *htab;
3086
3087 htab = elf_i386_hash_table (info);
3088
3089 if (h->plt.offset != (bfd_vma) -1)
3090 {
3091 bfd_vma plt_index;
3092 bfd_vma got_offset;
3093 Elf_Internal_Rela rel;
3094 bfd_byte *loc;
3095
3096 /* This symbol has an entry in the procedure linkage table. Set
3097 it up. */
3098
3099 if (h->dynindx == -1
3100 || htab->splt == NULL
3101 || htab->sgotplt == NULL
3102 || htab->srelplt == NULL)
3103 abort ();
3104
3105 /* Get the index in the procedure linkage table which
3106 corresponds to this symbol. This is the index of this symbol
3107 in all the symbols for which we are making plt entries. The
3108 first entry in the procedure linkage table is reserved. */
3109 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3110
3111 /* Get the offset into the .got table of the entry that
3112 corresponds to this function. Each .got entry is 4 bytes.
3113 The first three are reserved. */
3114 got_offset = (plt_index + 3) * 4;
3115
3116 /* Fill in the entry in the procedure linkage table. */
3117 if (! info->shared)
3118 {
3119 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3120 PLT_ENTRY_SIZE);
3121 bfd_put_32 (output_bfd,
3122 (htab->sgotplt->output_section->vma
3123 + htab->sgotplt->output_offset
3124 + got_offset),
3125 htab->splt->contents + h->plt.offset + 2);
3126
3127 if (htab->is_vxworks)
3128 {
3129 int s, k, reloc_index;
3130
3131 /* Create the R_386_32 relocation referencing the GOT
3132 for this PLT entry. */
3133
3134 /* S: Current slot number (zero-based). */
3135 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3136 /* K: Number of relocations for PLTResolve. */
3137 if (info->shared)
3138 k = PLTRESOLVE_RELOCS_SHLIB;
3139 else
3140 k = PLTRESOLVE_RELOCS;
3141 /* Skip the PLTresolve relocations, and the relocations for
3142 the other PLT slots. */
3143 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3144 loc = (htab->srelplt2->contents + reloc_index
3145 * sizeof (Elf32_External_Rel));
3146
3147 rel.r_offset = (htab->splt->output_section->vma
3148 + htab->splt->output_offset
3149 + h->plt.offset + 2),
3150 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3151 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3152
3153 /* Create the R_386_32 relocation referencing the beginning of
3154 the PLT for this GOT entry. */
3155 rel.r_offset = (htab->sgotplt->output_section->vma
3156 + htab->sgotplt->output_offset
3157 + got_offset);
3158 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3159 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3160 loc + sizeof (Elf32_External_Rel));
3161 }
3162
3163 }
3164 else
3165 {
3166 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3167 PLT_ENTRY_SIZE);
3168 bfd_put_32 (output_bfd, got_offset,
3169 htab->splt->contents + h->plt.offset + 2);
3170 }
3171
3172 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3173 htab->splt->contents + h->plt.offset + 7);
3174 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3175 htab->splt->contents + h->plt.offset + 12);
3176
3177 /* Fill in the entry in the global offset table. */
3178 bfd_put_32 (output_bfd,
3179 (htab->splt->output_section->vma
3180 + htab->splt->output_offset
3181 + h->plt.offset
3182 + 6),
3183 htab->sgotplt->contents + got_offset);
3184
3185 /* Fill in the entry in the .rel.plt section. */
3186 rel.r_offset = (htab->sgotplt->output_section->vma
3187 + htab->sgotplt->output_offset
3188 + got_offset);
3189 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3190 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3191 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3192
3193 if (!h->def_regular)
3194 {
3195 /* Mark the symbol as undefined, rather than as defined in
3196 the .plt section. Leave the value if there were any
3197 relocations where pointer equality matters (this is a clue
3198 for the dynamic linker, to make function pointer
3199 comparisons work between an application and shared
3200 library), otherwise set it to zero. If a function is only
3201 called from a binary, there is no need to slow down
3202 shared libraries because of that. */
3203 sym->st_shndx = SHN_UNDEF;
3204 if (!h->pointer_equality_needed)
3205 sym->st_value = 0;
3206 }
3207 }
3208
3209 if (h->got.offset != (bfd_vma) -1
3210 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3211 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3212 {
3213 Elf_Internal_Rela rel;
3214 bfd_byte *loc;
3215
3216 /* This symbol has an entry in the global offset table. Set it
3217 up. */
3218
3219 if (htab->sgot == NULL || htab->srelgot == NULL)
3220 abort ();
3221
3222 rel.r_offset = (htab->sgot->output_section->vma
3223 + htab->sgot->output_offset
3224 + (h->got.offset & ~(bfd_vma) 1));
3225
3226 /* If this is a static link, or it is a -Bsymbolic link and the
3227 symbol is defined locally or was forced to be local because
3228 of a version file, we just want to emit a RELATIVE reloc.
3229 The entry in the global offset table will already have been
3230 initialized in the relocate_section function. */
3231 if (info->shared
3232 && SYMBOL_REFERENCES_LOCAL (info, h))
3233 {
3234 BFD_ASSERT((h->got.offset & 1) != 0);
3235 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3236 }
3237 else
3238 {
3239 BFD_ASSERT((h->got.offset & 1) == 0);
3240 bfd_put_32 (output_bfd, (bfd_vma) 0,
3241 htab->sgot->contents + h->got.offset);
3242 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3243 }
3244
3245 loc = htab->srelgot->contents;
3246 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3247 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3248 }
3249
3250 if (h->needs_copy)
3251 {
3252 Elf_Internal_Rela rel;
3253 bfd_byte *loc;
3254
3255 /* This symbol needs a copy reloc. Set it up. */
3256
3257 if (h->dynindx == -1
3258 || (h->root.type != bfd_link_hash_defined
3259 && h->root.type != bfd_link_hash_defweak)
3260 || htab->srelbss == NULL)
3261 abort ();
3262
3263 rel.r_offset = (h->root.u.def.value
3264 + h->root.u.def.section->output_section->vma
3265 + h->root.u.def.section->output_offset);
3266 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3267 loc = htab->srelbss->contents;
3268 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3269 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3270 }
3271
3272 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3273 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3274 is relative to the ".got" section. */
3275 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3276 || (strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3277 && !htab->is_vxworks))
3278 sym->st_shndx = SHN_ABS;
3279
3280 return TRUE;
3281}
3282
3283/* Used to decide how to sort relocs in an optimal manner for the
3284 dynamic linker, before writing them out. */
3285
3286static enum elf_reloc_type_class
3287elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3288{
3289 switch (ELF32_R_TYPE (rela->r_info))
3290 {
3291 case R_386_RELATIVE:
3292 return reloc_class_relative;
3293 case R_386_JUMP_SLOT:
3294 return reloc_class_plt;
3295 case R_386_COPY:
3296 return reloc_class_copy;
3297 default:
3298 return reloc_class_normal;
3299 }
3300}
3301
3302/* Finish up the dynamic sections. */
3303
3304static bfd_boolean
3305elf_i386_finish_dynamic_sections (bfd *output_bfd,
3306 struct bfd_link_info *info)
3307{
3308 struct elf_i386_link_hash_table *htab;
3309 bfd *dynobj;
3310 asection *sdyn;
3311
3312 htab = elf_i386_hash_table (info);
3313 dynobj = htab->elf.dynobj;
3314 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3315
3316 if (htab->elf.dynamic_sections_created)
3317 {
3318 Elf32_External_Dyn *dyncon, *dynconend;
3319
3320 if (sdyn == NULL || htab->sgot == NULL)
3321 abort ();
3322
3323 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3324 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3325 for (; dyncon < dynconend; dyncon++)
3326 {
3327 Elf_Internal_Dyn dyn;
3328 asection *s;
3329
3330 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3331
3332 switch (dyn.d_tag)
3333 {
3334 default:
3335 continue;
3336
3337 case DT_PLTGOT:
3338 s = htab->sgotplt;
3339 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3340 break;
3341
3342 case DT_JMPREL:
3343 s = htab->srelplt;
3344 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3345 break;
3346
3347 case DT_PLTRELSZ:
3348 s = htab->srelplt;
3349 dyn.d_un.d_val = s->size;
3350 break;
3351
3352 case DT_RELSZ:
3353 /* My reading of the SVR4 ABI indicates that the
3354 procedure linkage table relocs (DT_JMPREL) should be
3355 included in the overall relocs (DT_REL). This is
3356 what Solaris does. However, UnixWare can not handle
3357 that case. Therefore, we override the DT_RELSZ entry
3358 here to make it not include the JMPREL relocs. */
3359 s = htab->srelplt;
3360 if (s == NULL)
3361 continue;
3362 dyn.d_un.d_val -= s->size;
3363 break;
3364
3365 case DT_REL:
3366 /* We may not be using the standard ELF linker script.
3367 If .rel.plt is the first .rel section, we adjust
3368 DT_REL to not include it. */
3369 s = htab->srelplt;
3370 if (s == NULL)
3371 continue;
3372 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3373 continue;
3374 dyn.d_un.d_ptr += s->size;
3375 break;
3376 }
3377
3378 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3379 }
3380
3381 /* Fill in the first entry in the procedure linkage table. */
3382 if (htab->splt && htab->splt->size > 0)
3383 {
3384 if (info->shared)
3385 {
3386 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3387 sizeof (elf_i386_pic_plt0_entry));
3388 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3389 htab->plt0_pad_byte,
3390 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3391 }
3392 else
3393 {
3394 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3395 sizeof(elf_i386_plt0_entry));
3396 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3397 htab->plt0_pad_byte,
3398 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3399 bfd_put_32 (output_bfd,
3400 (htab->sgotplt->output_section->vma
3401 + htab->sgotplt->output_offset
3402 + 4),
3403 htab->splt->contents + 2);
3404 bfd_put_32 (output_bfd,
3405 (htab->sgotplt->output_section->vma
3406 + htab->sgotplt->output_offset
3407 + 8),
3408 htab->splt->contents + 8);
3409
3410 if (htab->is_vxworks)
3411 {
3412 Elf_Internal_Rela rel;
3413 struct elf_link_hash_entry *hgot;
3414
3415 /* The VxWorks GOT is relocated by the dynamic linker.
3416 Therefore, we must emit relocations rather than
3417 simply computing the values now. */
3418 hgot = elf_link_hash_lookup (elf_hash_table (info),
3419 "_GLOBAL_OFFSET_TABLE_",
3420 FALSE, FALSE, FALSE);
3421 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3422 On IA32 we use REL relocations so the addend goes in
3423 the PLT directly. */
3424 rel.r_offset = (htab->splt->output_section->vma
3425 + htab->splt->output_offset
3426 + 2);
3427 rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32);
3428 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3429 htab->srelplt2->contents);
3430 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3431 rel.r_offset = (htab->splt->output_section->vma
3432 + htab->splt->output_offset
3433 + 8);
3434 rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32);
3435 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3436 htab->srelplt2->contents +
3437 sizeof (Elf32_External_Rel));
3438 }
3439 }
3440
3441 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3442 really seem like the right value. */
3443 elf_section_data (htab->splt->output_section)
3444 ->this_hdr.sh_entsize = 4;
3445
3446 /* Correct the .rel.plt.unloaded relocations. */
3447 if (htab->is_vxworks && !info->shared)
3448 {
3449 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3450 unsigned char *p;
3451
3452 p = htab->srelplt2->contents;
3453 if (info->shared)
3454 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3455 else
3456 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3457
3458 for (; num_plts; num_plts--)
3459 {
3460 Elf_Internal_Rela rel;
3461 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3462 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3463 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3464 p += sizeof (Elf32_External_Rel);
3465
3466 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3467 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3468 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3469 p += sizeof (Elf32_External_Rel);
3470 }
3471 }
3472 }
3473 }
3474
3475 if (htab->sgotplt)
3476 {
3477 /* Fill in the first three entries in the global offset table. */
3478 if (htab->sgotplt->size > 0)
3479 {
3480 bfd_put_32 (output_bfd,
3481 (sdyn == NULL ? 0
3482 : sdyn->output_section->vma + sdyn->output_offset),
3483 htab->sgotplt->contents);
3484 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3485 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3486 }
3487
3488 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3489 }
3490
3491 if (htab->sgot && htab->sgot->size > 0)
3492 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3493
3494 return TRUE;
3495}
3496
3497/* Return address for Ith PLT stub in section PLT, for relocation REL
3498 or (bfd_vma) -1 if it should not be included. */
3499
3500static bfd_vma
3501elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3502 const arelent *rel ATTRIBUTE_UNUSED)
3503{
3504 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3505}
3506
3507
3508#define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3509#define TARGET_LITTLE_NAME "elf32-i386"
3510#define ELF_ARCH bfd_arch_i386
3511#define ELF_MACHINE_CODE EM_386
3512#define ELF_MAXPAGESIZE 0x1000
3513
3514#define elf_backend_can_gc_sections 1
3515#define elf_backend_can_refcount 1
3516#define elf_backend_want_got_plt 1
3517#define elf_backend_plt_readonly 1
3518#define elf_backend_want_plt_sym 0
3519#define elf_backend_got_header_size 12
3520
3521/* Support RELA for objdump of prelink objects. */
3522#define elf_info_to_howto elf_i386_info_to_howto_rel
3523#define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3524
3525#define bfd_elf32_mkobject elf_i386_mkobject
3526
3527#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3528#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3529#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3530
3531#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3532#define elf_backend_check_relocs elf_i386_check_relocs
3533#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3534#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3535#define elf_backend_fake_sections elf_i386_fake_sections
3536#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3537#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3538#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3539#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3540#define elf_backend_grok_prstatus elf_i386_grok_prstatus
3541#define elf_backend_grok_psinfo elf_i386_grok_psinfo
3542#define elf_backend_reloc_type_class elf_i386_reloc_type_class
3543#define elf_backend_relocate_section elf_i386_relocate_section
3544#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3545#define elf_backend_plt_sym_val elf_i386_plt_sym_val
3546
3547#include "elf32-target.h"
3548
3549/* FreeBSD support. */
3550
3551#undef TARGET_LITTLE_SYM
3552#define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3553#undef TARGET_LITTLE_NAME
3554#define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3555
3556/* The kernel recognizes executables as valid only if they carry a
3557 "FreeBSD" label in the ELF header. So we put this label on all
3558 executables and (for simplicity) also all other object files. */
3559
3560static void
3561elf_i386_post_process_headers (bfd *abfd,
3562 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3563{
3564 Elf_Internal_Ehdr *i_ehdrp;
3565
3566 i_ehdrp = elf_elfheader (abfd);
3567
3568 /* Put an ABI label supported by FreeBSD >= 4.1. */
3569 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3570#ifdef OLD_FREEBSD_ABI_LABEL
3571 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3572 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3573#endif
3574}
3575
3576#undef elf_backend_post_process_headers
3577#define elf_backend_post_process_headers elf_i386_post_process_headers
3578#undef elf32_bed
3579#define elf32_bed elf32_i386_fbsd_bed
3580
3581#include "elf32-target.h"
3582
3583/* VxWorks support. */
3584
3585#undef TARGET_LITTLE_SYM
3586#define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
3587#undef TARGET_LITTLE_NAME
3588#define TARGET_LITTLE_NAME "elf32-i386-vxworks"
3589
3590
3591/* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
3592
3593static struct bfd_link_hash_table *
3594elf_i386_vxworks_link_hash_table_create (bfd *abfd)
3595{
3596 struct bfd_link_hash_table *ret;
3597 struct elf_i386_link_hash_table *htab;
3598
3599 ret = elf_i386_link_hash_table_create (abfd);
3600 if (ret)
3601 {
3602 htab = (struct elf_i386_link_hash_table *) ret;
3603 htab->is_vxworks = 1;
3604 htab->plt0_pad_byte = 0x90;
3605 }
3606
3607 return ret;
3608}
3609
3610
3611/* Tweak magic VxWorks symbols as they are written to the output file. */
3612static bfd_boolean
3613elf_i386_vxworks_link_output_symbol_hook (struct bfd_link_info *info
3614 ATTRIBUTE_UNUSED,
3615 const char *name,
3616 Elf_Internal_Sym *sym,
3617 asection *input_sec ATTRIBUTE_UNUSED,
3618 struct elf_link_hash_entry *h
3619 ATTRIBUTE_UNUSED)
3620{
3621 /* Ignore the first dummy symbol. */
3622 if (!name)
3623 return TRUE;
3624
3625 return elf_vxworks_link_output_symbol_hook (name, sym);
3626}
3627
3628#undef elf_backend_post_process_headers
3629#undef bfd_elf32_bfd_link_hash_table_create
3630#define bfd_elf32_bfd_link_hash_table_create \
3631 elf_i386_vxworks_link_hash_table_create
3632#undef elf_backend_add_symbol_hook
3633#define elf_backend_add_symbol_hook \
3634 elf_vxworks_add_symbol_hook
3635#undef elf_backend_link_output_symbol_hook
3636#define elf_backend_link_output_symbol_hook \
3637 elf_i386_vxworks_link_output_symbol_hook
3638#undef elf_backend_emit_relocs
3639#define elf_backend_emit_relocs elf_vxworks_emit_relocs
3640#undef elf_backend_final_write_processing
3641#define elf_backend_final_write_processing \
3642 elf_vxworks_final_write_processing
3643
3644/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
3645 define it. */
3646#undef elf_backend_want_plt_sym
3647#define elf_backend_want_plt_sym 1
3648
3649#undef elf32_bed
3650#define elf32_bed elf32_i386_vxworks_bed
3651
3652#include "elf32-target.h"
GDB Binutils - Deliverables
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