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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_signed,
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 {
915 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
916 while (h->root.type == bfd_link_hash_indirect
917 || h->root.type == bfd_link_hash_warning)
918 h = (struct elf_link_hash_entry *) h->root.u.i.link;
919 }
920
921 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
922
923 switch (r_type)
924 {
925 case R_386_TLS_LDM:
926 htab->tls_ldm_got.refcount += 1;
927 goto create_got;
928
929 case R_386_PLT32:
930 /* This symbol requires a procedure linkage table entry. We
931 actually build the entry in adjust_dynamic_symbol,
932 because this might be a case of linking PIC code which is
933 never referenced by a dynamic object, in which case we
934 don't need to generate a procedure linkage table entry
935 after all. */
936
937 /* If this is a local symbol, we resolve it directly without
938 creating a procedure linkage table entry. */
939 if (h == NULL)
940 continue;
941
942 h->needs_plt = 1;
943 h->plt.refcount += 1;
944 break;
945
946 case R_386_TLS_IE_32:
947 case R_386_TLS_IE:
948 case R_386_TLS_GOTIE:
949 if (info->shared)
950 info->flags |= DF_STATIC_TLS;
951 /* Fall through */
952
953 case R_386_GOT32:
954 case R_386_TLS_GD:
955 /* This symbol requires a global offset table entry. */
956 {
957 int tls_type, old_tls_type;
958
959 switch (r_type)
960 {
961 default:
962 case R_386_GOT32: tls_type = GOT_NORMAL; break;
963 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
964 case R_386_TLS_IE_32:
965 if (ELF32_R_TYPE (rel->r_info) == r_type)
966 tls_type = GOT_TLS_IE_NEG;
967 else
968 /* If this is a GD->IE transition, we may use either of
969 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
970 tls_type = GOT_TLS_IE;
971 break;
972 case R_386_TLS_IE:
973 case R_386_TLS_GOTIE:
974 tls_type = GOT_TLS_IE_POS; break;
975 }
976
977 if (h != NULL)
978 {
979 h->got.refcount += 1;
980 old_tls_type = elf_i386_hash_entry(h)->tls_type;
981 }
982 else
983 {
984 bfd_signed_vma *local_got_refcounts;
985
986 /* This is a global offset table entry for a local symbol. */
987 local_got_refcounts = elf_local_got_refcounts (abfd);
988 if (local_got_refcounts == NULL)
989 {
990 bfd_size_type size;
991
992 size = symtab_hdr->sh_info;
993 size *= (sizeof (bfd_signed_vma) + sizeof(char));
994 local_got_refcounts = bfd_zalloc (abfd, size);
995 if (local_got_refcounts == NULL)
996 return FALSE;
997 elf_local_got_refcounts (abfd) = local_got_refcounts;
998 elf_i386_local_got_tls_type (abfd)
999 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1000 }
1001 local_got_refcounts[r_symndx] += 1;
1002 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1003 }
1004
1005 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1006 tls_type |= old_tls_type;
1007 /* If a TLS symbol is accessed using IE at least once,
1008 there is no point to use dynamic model for it. */
1009 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1010 && (old_tls_type != GOT_TLS_GD
1011 || (tls_type & GOT_TLS_IE) == 0))
1012 {
1013 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
1014 tls_type = old_tls_type;
1015 else
1016 {
1017 (*_bfd_error_handler)
1018 (_("%B: `%s' accessed both as normal and "
1019 "thread local symbol"),
1020 abfd,
1021 h ? h->root.root.string : "<local>");
1022 return FALSE;
1023 }
1024 }
1025
1026 if (old_tls_type != tls_type)
1027 {
1028 if (h != NULL)
1029 elf_i386_hash_entry (h)->tls_type = tls_type;
1030 else
1031 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1032 }
1033 }
1034 /* Fall through */
1035
1036 case R_386_GOTOFF:
1037 case R_386_GOTPC:
1038 create_got:
1039 if (htab->sgot == NULL)
1040 {
1041 if (htab->elf.dynobj == NULL)
1042 htab->elf.dynobj = abfd;
1043 if (!create_got_section (htab->elf.dynobj, info))
1044 return FALSE;
1045 }
1046 if (r_type != R_386_TLS_IE)
1047 break;
1048 /* Fall through */
1049
1050 case R_386_TLS_LE_32:
1051 case R_386_TLS_LE:
1052 if (!info->shared)
1053 break;
1054 info->flags |= DF_STATIC_TLS;
1055 /* Fall through */
1056
1057 case R_386_32:
1058 case R_386_PC32:
1059 if (h != NULL && !info->shared)
1060 {
1061 /* If this reloc is in a read-only section, we might
1062 need a copy reloc. We can't check reliably at this
1063 stage whether the section is read-only, as input
1064 sections have not yet been mapped to output sections.
1065 Tentatively set the flag for now, and correct in
1066 adjust_dynamic_symbol. */
1067 h->non_got_ref = 1;
1068
1069 /* We may need a .plt entry if the function this reloc
1070 refers to is in a shared lib. */
1071 h->plt.refcount += 1;
1072 if (r_type != R_386_PC32)
1073 h->pointer_equality_needed = 1;
1074 }
1075
1076 /* If we are creating a shared library, and this is a reloc
1077 against a global symbol, or a non PC relative reloc
1078 against a local symbol, then we need to copy the reloc
1079 into the shared library. However, if we are linking with
1080 -Bsymbolic, we do not need to copy a reloc against a
1081 global symbol which is defined in an object we are
1082 including in the link (i.e., DEF_REGULAR is set). At
1083 this point we have not seen all the input files, so it is
1084 possible that DEF_REGULAR is not set now but will be set
1085 later (it is never cleared). In case of a weak definition,
1086 DEF_REGULAR may be cleared later by a strong definition in
1087 a shared library. We account for that possibility below by
1088 storing information in the relocs_copied field of the hash
1089 table entry. A similar situation occurs when creating
1090 shared libraries and symbol visibility changes render the
1091 symbol local.
1092
1093 If on the other hand, we are creating an executable, we
1094 may need to keep relocations for symbols satisfied by a
1095 dynamic library if we manage to avoid copy relocs for the
1096 symbol. */
1097 if ((info->shared
1098 && (sec->flags & SEC_ALLOC) != 0
1099 && (r_type != R_386_PC32
1100 || (h != NULL
1101 && (! info->symbolic
1102 || h->root.type == bfd_link_hash_defweak
1103 || !h->def_regular))))
1104 || (ELIMINATE_COPY_RELOCS
1105 && !info->shared
1106 && (sec->flags & SEC_ALLOC) != 0
1107 && h != NULL
1108 && (h->root.type == bfd_link_hash_defweak
1109 || !h->def_regular)))
1110 {
1111 struct elf_i386_dyn_relocs *p;
1112 struct elf_i386_dyn_relocs **head;
1113
1114 /* We must copy these reloc types into the output file.
1115 Create a reloc section in dynobj and make room for
1116 this reloc. */
1117 if (sreloc == NULL)
1118 {
1119 const char *name;
1120 bfd *dynobj;
1121 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1122 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1123
1124 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1125 if (name == NULL)
1126 return FALSE;
1127
1128 if (strncmp (name, ".rel", 4) != 0
1129 || strcmp (bfd_get_section_name (abfd, sec),
1130 name + 4) != 0)
1131 {
1132 (*_bfd_error_handler)
1133 (_("%B: bad relocation section name `%s\'"),
1134 abfd, name);
1135 }
1136
1137 if (htab->elf.dynobj == NULL)
1138 htab->elf.dynobj = abfd;
1139
1140 dynobj = htab->elf.dynobj;
1141 sreloc = bfd_get_section_by_name (dynobj, name);
1142 if (sreloc == NULL)
1143 {
1144 flagword flags;
1145
1146 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1147 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1148 if ((sec->flags & SEC_ALLOC) != 0)
1149 flags |= SEC_ALLOC | SEC_LOAD;
1150 sreloc = bfd_make_section_with_flags (dynobj,
1151 name,
1152 flags);
1153 if (sreloc == NULL
1154 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1155 return FALSE;
1156 }
1157 elf_section_data (sec)->sreloc = sreloc;
1158 }
1159
1160 /* If this is a global symbol, we count the number of
1161 relocations we need for this symbol. */
1162 if (h != NULL)
1163 {
1164 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1165 }
1166 else
1167 {
1168 /* Track dynamic relocs needed for local syms too.
1169 We really need local syms available to do this
1170 easily. Oh well. */
1171
1172 asection *s;
1173 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1174 sec, r_symndx);
1175 if (s == NULL)
1176 return FALSE;
1177
1178 head = ((struct elf_i386_dyn_relocs **)
1179 &elf_section_data (s)->local_dynrel);
1180 }
1181
1182 p = *head;
1183 if (p == NULL || p->sec != sec)
1184 {
1185 bfd_size_type amt = sizeof *p;
1186 p = bfd_alloc (htab->elf.dynobj, amt);
1187 if (p == NULL)
1188 return FALSE;
1189 p->next = *head;
1190 *head = p;
1191 p->sec = sec;
1192 p->count = 0;
1193 p->pc_count = 0;
1194 }
1195
1196 p->count += 1;
1197 if (r_type == R_386_PC32)
1198 p->pc_count += 1;
1199 }
1200 break;
1201
1202 /* This relocation describes the C++ object vtable hierarchy.
1203 Reconstruct it for later use during GC. */
1204 case R_386_GNU_VTINHERIT:
1205 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1206 return FALSE;
1207 break;
1208
1209 /* This relocation describes which C++ vtable entries are actually
1210 used. Record for later use during GC. */
1211 case R_386_GNU_VTENTRY:
1212 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1213 return FALSE;
1214 break;
1215
1216 default:
1217 break;
1218 }
1219 }
1220
1221 return TRUE;
1222}
1223
1224/* Return the section that should be marked against GC for a given
1225 relocation. */
1226
1227static asection *
1228elf_i386_gc_mark_hook (asection *sec,
1229 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1230 Elf_Internal_Rela *rel,
1231 struct elf_link_hash_entry *h,
1232 Elf_Internal_Sym *sym)
1233{
1234 if (h != NULL)
1235 {
1236 switch (ELF32_R_TYPE (rel->r_info))
1237 {
1238 case R_386_GNU_VTINHERIT:
1239 case R_386_GNU_VTENTRY:
1240 break;
1241
1242 default:
1243 switch (h->root.type)
1244 {
1245 case bfd_link_hash_defined:
1246 case bfd_link_hash_defweak:
1247 return h->root.u.def.section;
1248
1249 case bfd_link_hash_common:
1250 return h->root.u.c.p->section;
1251
1252 default:
1253 break;
1254 }
1255 }
1256 }
1257 else
1258 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1259
1260 return NULL;
1261}
1262
1263/* Update the got entry reference counts for the section being removed. */
1264
1265static bfd_boolean
1266elf_i386_gc_sweep_hook (bfd *abfd,
1267 struct bfd_link_info *info,
1268 asection *sec,
1269 const Elf_Internal_Rela *relocs)
1270{
1271 Elf_Internal_Shdr *symtab_hdr;
1272 struct elf_link_hash_entry **sym_hashes;
1273 bfd_signed_vma *local_got_refcounts;
1274 const Elf_Internal_Rela *rel, *relend;
1275
1276 elf_section_data (sec)->local_dynrel = NULL;
1277
1278 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1279 sym_hashes = elf_sym_hashes (abfd);
1280 local_got_refcounts = elf_local_got_refcounts (abfd);
1281
1282 relend = relocs + sec->reloc_count;
1283 for (rel = relocs; rel < relend; rel++)
1284 {
1285 unsigned long r_symndx;
1286 unsigned int r_type;
1287 struct elf_link_hash_entry *h = NULL;
1288
1289 r_symndx = ELF32_R_SYM (rel->r_info);
1290 if (r_symndx >= symtab_hdr->sh_info)
1291 {
1292 struct elf_i386_link_hash_entry *eh;
1293 struct elf_i386_dyn_relocs **pp;
1294 struct elf_i386_dyn_relocs *p;
1295
1296 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1297 while (h->root.type == bfd_link_hash_indirect
1298 || h->root.type == bfd_link_hash_warning)
1299 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1300 eh = (struct elf_i386_link_hash_entry *) h;
1301
1302 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1303 if (p->sec == sec)
1304 {
1305 /* Everything must go for SEC. */
1306 *pp = p->next;
1307 break;
1308 }
1309 }
1310
1311 r_type = ELF32_R_TYPE (rel->r_info);
1312 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1313 switch (r_type)
1314 {
1315 case R_386_TLS_LDM:
1316 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1317 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1318 break;
1319
1320 case R_386_TLS_GD:
1321 case R_386_TLS_IE_32:
1322 case R_386_TLS_IE:
1323 case R_386_TLS_GOTIE:
1324 case R_386_GOT32:
1325 if (h != NULL)
1326 {
1327 if (h->got.refcount > 0)
1328 h->got.refcount -= 1;
1329 }
1330 else if (local_got_refcounts != NULL)
1331 {
1332 if (local_got_refcounts[r_symndx] > 0)
1333 local_got_refcounts[r_symndx] -= 1;
1334 }
1335 break;
1336
1337 case R_386_32:
1338 case R_386_PC32:
1339 if (info->shared)
1340 break;
1341 /* Fall through */
1342
1343 case R_386_PLT32:
1344 if (h != NULL)
1345 {
1346 if (h->plt.refcount > 0)
1347 h->plt.refcount -= 1;
1348 }
1349 break;
1350
1351 default:
1352 break;
1353 }
1354 }
1355
1356 return TRUE;
1357}
1358
1359/* Adjust a symbol defined by a dynamic object and referenced by a
1360 regular object. The current definition is in some section of the
1361 dynamic object, but we're not including those sections. We have to
1362 change the definition to something the rest of the link can
1363 understand. */
1364
1365static bfd_boolean
1366elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1367 struct elf_link_hash_entry *h)
1368{
1369 struct elf_i386_link_hash_table *htab;
1370 asection *s;
1371 unsigned int power_of_two;
1372
1373 /* If this is a function, put it in the procedure linkage table. We
1374 will fill in the contents of the procedure linkage table later,
1375 when we know the address of the .got section. */
1376 if (h->type == STT_FUNC
1377 || h->needs_plt)
1378 {
1379 if (h->plt.refcount <= 0
1380 || SYMBOL_CALLS_LOCAL (info, h)
1381 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1382 && h->root.type == bfd_link_hash_undefweak))
1383 {
1384 /* This case can occur if we saw a PLT32 reloc in an input
1385 file, but the symbol was never referred to by a dynamic
1386 object, or if all references were garbage collected. In
1387 such a case, we don't actually need to build a procedure
1388 linkage table, and we can just do a PC32 reloc instead. */
1389 h->plt.offset = (bfd_vma) -1;
1390 h->needs_plt = 0;
1391 }
1392
1393 return TRUE;
1394 }
1395 else
1396 /* It's possible that we incorrectly decided a .plt reloc was
1397 needed for an R_386_PC32 reloc to a non-function sym in
1398 check_relocs. We can't decide accurately between function and
1399 non-function syms in check-relocs; Objects loaded later in
1400 the link may change h->type. So fix it now. */
1401 h->plt.offset = (bfd_vma) -1;
1402
1403 /* If this is a weak symbol, and there is a real definition, the
1404 processor independent code will have arranged for us to see the
1405 real definition first, and we can just use the same value. */
1406 if (h->u.weakdef != NULL)
1407 {
1408 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1409 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1410 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1411 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1412 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1413 h->non_got_ref = h->u.weakdef->non_got_ref;
1414 return TRUE;
1415 }
1416
1417 /* This is a reference to a symbol defined by a dynamic object which
1418 is not a function. */
1419
1420 /* If we are creating a shared library, we must presume that the
1421 only references to the symbol are via the global offset table.
1422 For such cases we need not do anything here; the relocations will
1423 be handled correctly by relocate_section. */
1424 if (info->shared)
1425 return TRUE;
1426
1427 /* If there are no references to this symbol that do not use the
1428 GOT, we don't need to generate a copy reloc. */
1429 if (!h->non_got_ref)
1430 return TRUE;
1431
1432 /* If -z nocopyreloc was given, we won't generate them either. */
1433 if (info->nocopyreloc)
1434 {
1435 h->non_got_ref = 0;
1436 return TRUE;
1437 }
1438
1439 htab = elf_i386_hash_table (info);
1440
1441 /* If there aren't any dynamic relocs in read-only sections, then
1442 we can keep the dynamic relocs and avoid the copy reloc. This
1443 doesn't work on VxWorks, where we can not have dynamic relocations
1444 (other than copy and jump slot relocations) in an executable. */
1445 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1446 {
1447 struct elf_i386_link_hash_entry * eh;
1448 struct elf_i386_dyn_relocs *p;
1449
1450 eh = (struct elf_i386_link_hash_entry *) h;
1451 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1452 {
1453 s = p->sec->output_section;
1454 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1455 break;
1456 }
1457
1458 if (p == NULL)
1459 {
1460 h->non_got_ref = 0;
1461 return TRUE;
1462 }
1463 }
1464
1465 /* We must allocate the symbol in our .dynbss section, which will
1466 become part of the .bss section of the executable. There will be
1467 an entry for this symbol in the .dynsym section. The dynamic
1468 object will contain position independent code, so all references
1469 from the dynamic object to this symbol will go through the global
1470 offset table. The dynamic linker will use the .dynsym entry to
1471 determine the address it must put in the global offset table, so
1472 both the dynamic object and the regular object will refer to the
1473 same memory location for the variable. */
1474
1475 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1476 copy the initial value out of the dynamic object and into the
1477 runtime process image. */
1478 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1479 {
1480 htab->srelbss->size += sizeof (Elf32_External_Rel);
1481 h->needs_copy = 1;
1482 }
1483
1484 /* We need to figure out the alignment required for this symbol. I
1485 have no idea how ELF linkers handle this. */
1486 power_of_two = bfd_log2 (h->size);
1487 if (power_of_two > 3)
1488 power_of_two = 3;
1489
1490 /* Apply the required alignment. */
1491 s = htab->sdynbss;
1492 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1493 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1494 {
1495 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1496 return FALSE;
1497 }
1498
1499 /* Define the symbol as being at this point in the section. */
1500 h->root.u.def.section = s;
1501 h->root.u.def.value = s->size;
1502
1503 /* Increment the section size to make room for the symbol. */
1504 s->size += h->size;
1505
1506 return TRUE;
1507}
1508
1509/* Allocate space in .plt, .got and associated reloc sections for
1510 dynamic relocs. */
1511
1512static bfd_boolean
1513allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1514{
1515 struct bfd_link_info *info;
1516 struct elf_i386_link_hash_table *htab;
1517 struct elf_i386_link_hash_entry *eh;
1518 struct elf_i386_dyn_relocs *p;
1519
1520 if (h->root.type == bfd_link_hash_indirect)
1521 return TRUE;
1522
1523 if (h->root.type == bfd_link_hash_warning)
1524 /* When warning symbols are created, they **replace** the "real"
1525 entry in the hash table, thus we never get to see the real
1526 symbol in a hash traversal. So look at it now. */
1527 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1528
1529 info = (struct bfd_link_info *) inf;
1530 htab = elf_i386_hash_table (info);
1531
1532 if (htab->elf.dynamic_sections_created
1533 && h->plt.refcount > 0)
1534 {
1535 /* Make sure this symbol is output as a dynamic symbol.
1536 Undefined weak syms won't yet be marked as dynamic. */
1537 if (h->dynindx == -1
1538 && !h->forced_local)
1539 {
1540 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1541 return FALSE;
1542 }
1543
1544 if (info->shared
1545 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1546 {
1547 asection *s = htab->splt;
1548
1549 /* If this is the first .plt entry, make room for the special
1550 first entry. */
1551 if (s->size == 0)
1552 s->size += PLT_ENTRY_SIZE;
1553
1554 h->plt.offset = s->size;
1555
1556 /* If this symbol is not defined in a regular file, and we are
1557 not generating a shared library, then set the symbol to this
1558 location in the .plt. This is required to make function
1559 pointers compare as equal between the normal executable and
1560 the shared library. */
1561 if (! info->shared
1562 && !h->def_regular)
1563 {
1564 h->root.u.def.section = s;
1565 h->root.u.def.value = h->plt.offset;
1566 }
1567
1568 /* Make room for this entry. */
1569 s->size += PLT_ENTRY_SIZE;
1570
1571 /* We also need to make an entry in the .got.plt section, which
1572 will be placed in the .got section by the linker script. */
1573 htab->sgotplt->size += 4;
1574
1575 /* We also need to make an entry in the .rel.plt section. */
1576 htab->srelplt->size += sizeof (Elf32_External_Rel);
1577
1578 if (htab->is_vxworks && !info->shared)
1579 {
1580 /* VxWorks has a second set of relocations for each PLT entry
1581 in executables. They go in a separate relocation section,
1582 which is processed by the kernel loader. */
1583
1584 /* There are two relocations for the initial PLT entry: an
1585 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1586 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1587
1588 if (h->plt.offset == PLT_ENTRY_SIZE)
1589 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1590
1591 /* There are two extra relocations for each subsequent PLT entry:
1592 an R_386_32 relocation for the GOT entry, and an R_386_32
1593 relocation for the PLT entry. */
1594
1595 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1596 }
1597 }
1598 else
1599 {
1600 h->plt.offset = (bfd_vma) -1;
1601 h->needs_plt = 0;
1602 }
1603 }
1604 else
1605 {
1606 h->plt.offset = (bfd_vma) -1;
1607 h->needs_plt = 0;
1608 }
1609
1610 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1611 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1612 if (h->got.refcount > 0
1613 && !info->shared
1614 && h->dynindx == -1
1615 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1616 h->got.offset = (bfd_vma) -1;
1617 else if (h->got.refcount > 0)
1618 {
1619 asection *s;
1620 bfd_boolean dyn;
1621 int tls_type = elf_i386_hash_entry(h)->tls_type;
1622
1623 /* Make sure this symbol is output as a dynamic symbol.
1624 Undefined weak syms won't yet be marked as dynamic. */
1625 if (h->dynindx == -1
1626 && !h->forced_local)
1627 {
1628 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1629 return FALSE;
1630 }
1631
1632 s = htab->sgot;
1633 h->got.offset = s->size;
1634 s->size += 4;
1635 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1636 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1637 s->size += 4;
1638 dyn = htab->elf.dynamic_sections_created;
1639 /* R_386_TLS_IE_32 needs one dynamic relocation,
1640 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1641 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1642 need two), R_386_TLS_GD needs one if local symbol and two if
1643 global. */
1644 if (tls_type == GOT_TLS_IE_BOTH)
1645 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1646 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1647 || (tls_type & GOT_TLS_IE))
1648 htab->srelgot->size += sizeof (Elf32_External_Rel);
1649 else if (tls_type == GOT_TLS_GD)
1650 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1651 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1652 || h->root.type != bfd_link_hash_undefweak)
1653 && (info->shared
1654 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1655 htab->srelgot->size += sizeof (Elf32_External_Rel);
1656 }
1657 else
1658 h->got.offset = (bfd_vma) -1;
1659
1660 eh = (struct elf_i386_link_hash_entry *) h;
1661 if (eh->dyn_relocs == NULL)
1662 return TRUE;
1663
1664 /* In the shared -Bsymbolic case, discard space allocated for
1665 dynamic pc-relative relocs against symbols which turn out to be
1666 defined in regular objects. For the normal shared case, discard
1667 space for pc-relative relocs that have become local due to symbol
1668 visibility changes. */
1669
1670 if (info->shared)
1671 {
1672 /* The only reloc that uses pc_count is R_386_PC32, which will
1673 appear on a call or on something like ".long foo - .". We
1674 want calls to protected symbols to resolve directly to the
1675 function rather than going via the plt. If people want
1676 function pointer comparisons to work as expected then they
1677 should avoid writing assembly like ".long foo - .". */
1678 if (SYMBOL_CALLS_LOCAL (info, h))
1679 {
1680 struct elf_i386_dyn_relocs **pp;
1681
1682 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1683 {
1684 p->count -= p->pc_count;
1685 p->pc_count = 0;
1686 if (p->count == 0)
1687 *pp = p->next;
1688 else
1689 pp = &p->next;
1690 }
1691 }
1692
1693 /* Also discard relocs on undefined weak syms with non-default
1694 visibility. */
1695 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1696 && h->root.type == bfd_link_hash_undefweak)
1697 eh->dyn_relocs = NULL;
1698 }
1699 else if (ELIMINATE_COPY_RELOCS)
1700 {
1701 /* For the non-shared case, discard space for relocs against
1702 symbols which turn out to need copy relocs or are not
1703 dynamic. */
1704
1705 if (!h->non_got_ref
1706 && ((h->def_dynamic
1707 && !h->def_regular)
1708 || (htab->elf.dynamic_sections_created
1709 && (h->root.type == bfd_link_hash_undefweak
1710 || h->root.type == bfd_link_hash_undefined))))
1711 {
1712 /* Make sure this symbol is output as a dynamic symbol.
1713 Undefined weak syms won't yet be marked as dynamic. */
1714 if (h->dynindx == -1
1715 && !h->forced_local)
1716 {
1717 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1718 return FALSE;
1719 }
1720
1721 /* If that succeeded, we know we'll be keeping all the
1722 relocs. */
1723 if (h->dynindx != -1)
1724 goto keep;
1725 }
1726
1727 eh->dyn_relocs = NULL;
1728
1729 keep: ;
1730 }
1731
1732 /* Finally, allocate space. */
1733 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1734 {
1735 asection *sreloc = elf_section_data (p->sec)->sreloc;
1736 sreloc->size += p->count * sizeof (Elf32_External_Rel);
1737 }
1738
1739 return TRUE;
1740}
1741
1742/* Find any dynamic relocs that apply to read-only sections. */
1743
1744static bfd_boolean
1745readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1746{
1747 struct elf_i386_link_hash_entry *eh;
1748 struct elf_i386_dyn_relocs *p;
1749
1750 if (h->root.type == bfd_link_hash_warning)
1751 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1752
1753 eh = (struct elf_i386_link_hash_entry *) h;
1754 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1755 {
1756 asection *s = p->sec->output_section;
1757
1758 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1759 {
1760 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1761
1762 info->flags |= DF_TEXTREL;
1763
1764 /* Not an error, just cut short the traversal. */
1765 return FALSE;
1766 }
1767 }
1768 return TRUE;
1769}
1770
1771/* Set the sizes of the dynamic sections. */
1772
1773static bfd_boolean
1774elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1775 struct bfd_link_info *info)
1776{
1777 struct elf_i386_link_hash_table *htab;
1778 bfd *dynobj;
1779 asection *s;
1780 bfd_boolean relocs;
1781 bfd *ibfd;
1782
1783 htab = elf_i386_hash_table (info);
1784 dynobj = htab->elf.dynobj;
1785 if (dynobj == NULL)
1786 abort ();
1787
1788 if (htab->elf.dynamic_sections_created)
1789 {
1790 /* Set the contents of the .interp section to the interpreter. */
1791 if (info->executable)
1792 {
1793 s = bfd_get_section_by_name (dynobj, ".interp");
1794 if (s == NULL)
1795 abort ();
1796 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1797 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1798 }
1799 }
1800
1801 /* Set up .got offsets for local syms, and space for local dynamic
1802 relocs. */
1803 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1804 {
1805 bfd_signed_vma *local_got;
1806 bfd_signed_vma *end_local_got;
1807 char *local_tls_type;
1808 bfd_size_type locsymcount;
1809 Elf_Internal_Shdr *symtab_hdr;
1810 asection *srel;
1811
1812 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1813 continue;
1814
1815 for (s = ibfd->sections; s != NULL; s = s->next)
1816 {
1817 struct elf_i386_dyn_relocs *p;
1818
1819 for (p = *((struct elf_i386_dyn_relocs **)
1820 &elf_section_data (s)->local_dynrel);
1821 p != NULL;
1822 p = p->next)
1823 {
1824 if (!bfd_is_abs_section (p->sec)
1825 && bfd_is_abs_section (p->sec->output_section))
1826 {
1827 /* Input section has been discarded, either because
1828 it is a copy of a linkonce section or due to
1829 linker script /DISCARD/, so we'll be discarding
1830 the relocs too. */
1831 }
1832 else if (p->count != 0)
1833 {
1834 srel = elf_section_data (p->sec)->sreloc;
1835 srel->size += p->count * sizeof (Elf32_External_Rel);
1836 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1837 info->flags |= DF_TEXTREL;
1838 }
1839 }
1840 }
1841
1842 local_got = elf_local_got_refcounts (ibfd);
1843 if (!local_got)
1844 continue;
1845
1846 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1847 locsymcount = symtab_hdr->sh_info;
1848 end_local_got = local_got + locsymcount;
1849 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1850 s = htab->sgot;
1851 srel = htab->srelgot;
1852 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1853 {
1854 if (*local_got > 0)
1855 {
1856 *local_got = s->size;
1857 s->size += 4;
1858 if (*local_tls_type == GOT_TLS_GD
1859 || *local_tls_type == GOT_TLS_IE_BOTH)
1860 s->size += 4;
1861 if (info->shared
1862 || *local_tls_type == GOT_TLS_GD
1863 || (*local_tls_type & GOT_TLS_IE))
1864 {
1865 if (*local_tls_type == GOT_TLS_IE_BOTH)
1866 srel->size += 2 * sizeof (Elf32_External_Rel);
1867 else
1868 srel->size += sizeof (Elf32_External_Rel);
1869 }
1870 }
1871 else
1872 *local_got = (bfd_vma) -1;
1873 }
1874 }
1875
1876 if (htab->tls_ldm_got.refcount > 0)
1877 {
1878 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1879 relocs. */
1880 htab->tls_ldm_got.offset = htab->sgot->size;
1881 htab->sgot->size += 8;
1882 htab->srelgot->size += sizeof (Elf32_External_Rel);
1883 }
1884 else
1885 htab->tls_ldm_got.offset = -1;
1886
1887 if (htab->is_vxworks)
1888 {
1889 /* Save the GOT and PLT symbols in the hash table for easy access.
1890 Mark them as having relocations; they might not, but we won't
1891 know for sure until we build the GOT in finish_dynamic_symbol. */
1892
1893 htab->hgot = elf_link_hash_lookup (elf_hash_table (info),
1894 "_GLOBAL_OFFSET_TABLE_",
1895 FALSE, FALSE, FALSE);
1896 if (htab->hgot)
1897 htab->hgot->indx = -2;
1898 htab->hplt = elf_link_hash_lookup (elf_hash_table (info),
1899 "_PROCEDURE_LINKAGE_TABLE_",
1900 FALSE, FALSE, FALSE);
1901 if (htab->hplt)
1902 htab->hplt->indx = -2;
1903
1904 if (htab->is_vxworks && htab->hplt && htab->splt->flags & SEC_CODE)
1905 htab->hplt->type = STT_FUNC;
1906 }
1907
1908 /* Allocate global sym .plt and .got entries, and space for global
1909 sym dynamic relocs. */
1910 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1911
1912 /* We now have determined the sizes of the various dynamic sections.
1913 Allocate memory for them. */
1914 relocs = FALSE;
1915 for (s = dynobj->sections; s != NULL; s = s->next)
1916 {
1917 bfd_boolean strip_section = TRUE;
1918
1919 if ((s->flags & SEC_LINKER_CREATED) == 0)
1920 continue;
1921
1922 if (s == htab->splt
1923 || s == htab->sgot
1924 || s == htab->sgotplt
1925 || s == htab->sdynbss)
1926 {
1927 /* Strip this section if we don't need it; see the
1928 comment below. */
1929 /* We'd like to strip these sections if they aren't needed, but if
1930 we've exported dynamic symbols from them we must leave them.
1931 It's too late to tell BFD to get rid of the symbols. */
1932
1933 if (htab->hplt != NULL)
1934 strip_section = FALSE;
1935 }
1936 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1937 {
1938 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
1939 relocs = TRUE;
1940
1941 /* We use the reloc_count field as a counter if we need
1942 to copy relocs into the output file. */
1943 s->reloc_count = 0;
1944 }
1945 else
1946 {
1947 /* It's not one of our sections, so don't allocate space. */
1948 continue;
1949 }
1950
1951 if (s->size == 0)
1952 {
1953 /* If we don't need this section, strip it from the
1954 output file. This is mostly to handle .rel.bss and
1955 .rel.plt. We must create both sections in
1956 create_dynamic_sections, because they must be created
1957 before the linker maps input sections to output
1958 sections. The linker does that before
1959 adjust_dynamic_symbol is called, and it is that
1960 function which decides whether anything needs to go
1961 into these sections. */
1962 if (strip_section)
1963 s->flags |= SEC_EXCLUDE;
1964 continue;
1965 }
1966
1967 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1968 continue;
1969
1970 /* Allocate memory for the section contents. We use bfd_zalloc
1971 here in case unused entries are not reclaimed before the
1972 section's contents are written out. This should not happen,
1973 but this way if it does, we get a R_386_NONE reloc instead
1974 of garbage. */
1975 s->contents = bfd_zalloc (dynobj, s->size);
1976 if (s->contents == NULL)
1977 return FALSE;
1978 }
1979
1980 if (htab->elf.dynamic_sections_created)
1981 {
1982 /* Add some entries to the .dynamic section. We fill in the
1983 values later, in elf_i386_finish_dynamic_sections, but we
1984 must add the entries now so that we get the correct size for
1985 the .dynamic section. The DT_DEBUG entry is filled in by the
1986 dynamic linker and used by the debugger. */
1987#define add_dynamic_entry(TAG, VAL) \
1988 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1989
1990 if (info->executable)
1991 {
1992 if (!add_dynamic_entry (DT_DEBUG, 0))
1993 return FALSE;
1994 }
1995
1996 if (htab->splt->size != 0)
1997 {
1998 if (!add_dynamic_entry (DT_PLTGOT, 0)
1999 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2000 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2001 || !add_dynamic_entry (DT_JMPREL, 0))
2002 return FALSE;
2003 }
2004
2005 if (relocs)
2006 {
2007 if (!add_dynamic_entry (DT_REL, 0)
2008 || !add_dynamic_entry (DT_RELSZ, 0)
2009 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2010 return FALSE;
2011
2012 /* If any dynamic relocs apply to a read-only section,
2013 then we need a DT_TEXTREL entry. */
2014 if ((info->flags & DF_TEXTREL) == 0)
2015 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2016 (PTR) info);
2017
2018 if ((info->flags & DF_TEXTREL) != 0)
2019 {
2020 if (!add_dynamic_entry (DT_TEXTREL, 0))
2021 return FALSE;
2022 }
2023 }
2024 }
2025#undef add_dynamic_entry
2026
2027 return TRUE;
2028}
2029
2030/* Set the correct type for an x86 ELF section. We do this by the
2031 section name, which is a hack, but ought to work. */
2032
2033static bfd_boolean
2034elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2035 Elf_Internal_Shdr *hdr,
2036 asection *sec)
2037{
2038 register const char *name;
2039
2040 name = bfd_get_section_name (abfd, sec);
2041
2042 /* This is an ugly, but unfortunately necessary hack that is
2043 needed when producing EFI binaries on x86. It tells
2044 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2045 containing ELF relocation info. We need this hack in order to
2046 be able to generate ELF binaries that can be translated into
2047 EFI applications (which are essentially COFF objects). Those
2048 files contain a COFF ".reloc" section inside an ELFNN object,
2049 which would normally cause BFD to segfault because it would
2050 attempt to interpret this section as containing relocation
2051 entries for section "oc". With this hack enabled, ".reloc"
2052 will be treated as a normal data section, which will avoid the
2053 segfault. However, you won't be able to create an ELFNN binary
2054 with a section named "oc" that needs relocations, but that's
2055 the kind of ugly side-effects you get when detecting section
2056 types based on their names... In practice, this limitation is
2057 unlikely to bite. */
2058 if (strcmp (name, ".reloc") == 0)
2059 hdr->sh_type = SHT_PROGBITS;
2060
2061 return TRUE;
2062}
2063
2064/* Return the base VMA address which should be subtracted from real addresses
2065 when resolving @dtpoff relocation.
2066 This is PT_TLS segment p_vaddr. */
2067
2068static bfd_vma
2069dtpoff_base (struct bfd_link_info *info)
2070{
2071 /* If tls_sec is NULL, we should have signalled an error already. */
2072 if (elf_hash_table (info)->tls_sec == NULL)
2073 return 0;
2074 return elf_hash_table (info)->tls_sec->vma;
2075}
2076
2077/* Return the relocation value for @tpoff relocation
2078 if STT_TLS virtual address is ADDRESS. */
2079
2080static bfd_vma
2081tpoff (struct bfd_link_info *info, bfd_vma address)
2082{
2083 struct elf_link_hash_table *htab = elf_hash_table (info);
2084
2085 /* If tls_sec is NULL, we should have signalled an error already. */
2086 if (htab->tls_sec == NULL)
2087 return 0;
2088 return htab->tls_size + htab->tls_sec->vma - address;
2089}
2090
2091/* Relocate an i386 ELF section. */
2092
2093static bfd_boolean
2094elf_i386_relocate_section (bfd *output_bfd,
2095 struct bfd_link_info *info,
2096 bfd *input_bfd,
2097 asection *input_section,
2098 bfd_byte *contents,
2099 Elf_Internal_Rela *relocs,
2100 Elf_Internal_Sym *local_syms,
2101 asection **local_sections)
2102{
2103 struct elf_i386_link_hash_table *htab;
2104 Elf_Internal_Shdr *symtab_hdr;
2105 struct elf_link_hash_entry **sym_hashes;
2106 bfd_vma *local_got_offsets;
2107 Elf_Internal_Rela *rel;
2108 Elf_Internal_Rela *relend;
2109
2110 htab = elf_i386_hash_table (info);
2111 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2112 sym_hashes = elf_sym_hashes (input_bfd);
2113 local_got_offsets = elf_local_got_offsets (input_bfd);
2114
2115 rel = relocs;
2116 relend = relocs + input_section->reloc_count;
2117 for (; rel < relend; rel++)
2118 {
2119 unsigned int r_type;
2120 reloc_howto_type *howto;
2121 unsigned long r_symndx;
2122 struct elf_link_hash_entry *h;
2123 Elf_Internal_Sym *sym;
2124 asection *sec;
2125 bfd_vma off;
2126 bfd_vma relocation;
2127 bfd_boolean unresolved_reloc;
2128 bfd_reloc_status_type r;
2129 unsigned int indx;
2130 int tls_type;
2131
2132 r_type = ELF32_R_TYPE (rel->r_info);
2133 if (r_type == R_386_GNU_VTINHERIT
2134 || r_type == R_386_GNU_VTENTRY)
2135 continue;
2136
2137 if ((indx = r_type) >= R_386_standard
2138 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2139 >= R_386_ext - R_386_standard)
2140 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2141 >= R_386_tls - R_386_ext))
2142 {
2143 (*_bfd_error_handler)
2144 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2145 input_bfd, input_section, r_type);
2146 bfd_set_error (bfd_error_bad_value);
2147 return FALSE;
2148 }
2149 howto = elf_howto_table + indx;
2150
2151 r_symndx = ELF32_R_SYM (rel->r_info);
2152
2153 if (info->relocatable)
2154 {
2155 bfd_vma val;
2156 bfd_byte *where;
2157
2158 /* This is a relocatable link. We don't have to change
2159 anything, unless the reloc is against a section symbol,
2160 in which case we have to adjust according to where the
2161 section symbol winds up in the output section. */
2162 if (r_symndx >= symtab_hdr->sh_info)
2163 continue;
2164
2165 sym = local_syms + r_symndx;
2166 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2167 continue;
2168
2169 sec = local_sections[r_symndx];
2170 val = sec->output_offset;
2171 if (val == 0)
2172 continue;
2173
2174 where = contents + rel->r_offset;
2175 switch (howto->size)
2176 {
2177 /* FIXME: overflow checks. */
2178 case 0:
2179 val += bfd_get_8 (input_bfd, where);
2180 bfd_put_8 (input_bfd, val, where);
2181 break;
2182 case 1:
2183 val += bfd_get_16 (input_bfd, where);
2184 bfd_put_16 (input_bfd, val, where);
2185 break;
2186 case 2:
2187 val += bfd_get_32 (input_bfd, where);
2188 bfd_put_32 (input_bfd, val, where);
2189 break;
2190 default:
2191 abort ();
2192 }
2193 continue;
2194 }
2195
2196 /* This is a final link. */
2197 h = NULL;
2198 sym = NULL;
2199 sec = NULL;
2200 unresolved_reloc = FALSE;
2201 if (r_symndx < symtab_hdr->sh_info)
2202 {
2203 sym = local_syms + r_symndx;
2204 sec = local_sections[r_symndx];
2205 relocation = (sec->output_section->vma
2206 + sec->output_offset
2207 + sym->st_value);
2208 if ((sec->flags & SEC_MERGE)
2209 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2210 {
2211 asection *msec;
2212 bfd_vma addend;
2213 bfd_byte *where = contents + rel->r_offset;
2214
2215 switch (howto->size)
2216 {
2217 case 0:
2218 addend = bfd_get_8 (input_bfd, where);
2219 if (howto->pc_relative)
2220 {
2221 addend = (addend ^ 0x80) - 0x80;
2222 addend += 1;
2223 }
2224 break;
2225 case 1:
2226 addend = bfd_get_16 (input_bfd, where);
2227 if (howto->pc_relative)
2228 {
2229 addend = (addend ^ 0x8000) - 0x8000;
2230 addend += 2;
2231 }
2232 break;
2233 case 2:
2234 addend = bfd_get_32 (input_bfd, where);
2235 if (howto->pc_relative)
2236 {
2237 addend = (addend ^ 0x80000000) - 0x80000000;
2238 addend += 4;
2239 }
2240 break;
2241 default:
2242 abort ();
2243 }
2244
2245 msec = sec;
2246 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2247 addend -= relocation;
2248 addend += msec->output_section->vma + msec->output_offset;
2249
2250 switch (howto->size)
2251 {
2252 case 0:
2253 /* FIXME: overflow checks. */
2254 if (howto->pc_relative)
2255 addend -= 1;
2256 bfd_put_8 (input_bfd, addend, where);
2257 break;
2258 case 1:
2259 if (howto->pc_relative)
2260 addend -= 2;
2261 bfd_put_16 (input_bfd, addend, where);
2262 break;
2263 case 2:
2264 if (howto->pc_relative)
2265 addend -= 4;
2266 bfd_put_32 (input_bfd, addend, where);
2267 break;
2268 }
2269 }
2270 }
2271 else
2272 {
2273 bfd_boolean warned;
2274
2275 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2276 r_symndx, symtab_hdr, sym_hashes,
2277 h, sec, relocation,
2278 unresolved_reloc, warned);
2279 }
2280
2281 if (r_symndx == 0)
2282 {
2283 /* r_symndx will be zero only for relocs against symbols from
2284 removed linkonce sections, or sections discarded by a linker
2285 script. For these relocs, we just want the section contents
2286 zeroed. Avoid any special processing in the switch below. */
2287 r_type = R_386_NONE;
2288
2289 relocation = 0;
2290 if (howto->pc_relative)
2291 relocation = (input_section->output_section->vma
2292 + input_section->output_offset
2293 + rel->r_offset);
2294 }
2295
2296 switch (r_type)
2297 {
2298 case R_386_GOT32:
2299 /* Relocation is to the entry for this symbol in the global
2300 offset table. */
2301 if (htab->sgot == NULL)
2302 abort ();
2303
2304 if (h != NULL)
2305 {
2306 bfd_boolean dyn;
2307
2308 off = h->got.offset;
2309 dyn = htab->elf.dynamic_sections_created;
2310 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2311 || (info->shared
2312 && SYMBOL_REFERENCES_LOCAL (info, h))
2313 || (ELF_ST_VISIBILITY (h->other)
2314 && h->root.type == bfd_link_hash_undefweak))
2315 {
2316 /* This is actually a static link, or it is a
2317 -Bsymbolic link and the symbol is defined
2318 locally, or the symbol was forced to be local
2319 because of a version file. We must initialize
2320 this entry in the global offset table. Since the
2321 offset must always be a multiple of 4, we use the
2322 least significant bit to record whether we have
2323 initialized it already.
2324
2325 When doing a dynamic link, we create a .rel.got
2326 relocation entry to initialize the value. This
2327 is done in the finish_dynamic_symbol routine. */
2328 if ((off & 1) != 0)
2329 off &= ~1;
2330 else
2331 {
2332 bfd_put_32 (output_bfd, relocation,
2333 htab->sgot->contents + off);
2334 h->got.offset |= 1;
2335 }
2336 }
2337 else
2338 unresolved_reloc = FALSE;
2339 }
2340 else
2341 {
2342 if (local_got_offsets == NULL)
2343 abort ();
2344
2345 off = local_got_offsets[r_symndx];
2346
2347 /* The offset must always be a multiple of 4. We use
2348 the least significant bit to record whether we have
2349 already generated the necessary reloc. */
2350 if ((off & 1) != 0)
2351 off &= ~1;
2352 else
2353 {
2354 bfd_put_32 (output_bfd, relocation,
2355 htab->sgot->contents + off);
2356
2357 if (info->shared)
2358 {
2359 asection *s;
2360 Elf_Internal_Rela outrel;
2361 bfd_byte *loc;
2362
2363 s = htab->srelgot;
2364 if (s == NULL)
2365 abort ();
2366
2367 outrel.r_offset = (htab->sgot->output_section->vma
2368 + htab->sgot->output_offset
2369 + off);
2370 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2371 loc = s->contents;
2372 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2373 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2374 }
2375
2376 local_got_offsets[r_symndx] |= 1;
2377 }
2378 }
2379
2380 if (off >= (bfd_vma) -2)
2381 abort ();
2382
2383 relocation = htab->sgot->output_section->vma
2384 + htab->sgot->output_offset + off
2385 - htab->sgotplt->output_section->vma
2386 - htab->sgotplt->output_offset;
2387 break;
2388
2389 case R_386_GOTOFF:
2390 /* Relocation is relative to the start of the global offset
2391 table. */
2392
2393 /* Check to make sure it isn't a protected function symbol
2394 for shared library since it may not be local when used
2395 as function address. */
2396 if (info->shared
2397 && !info->executable
2398 && h
2399 && h->def_regular
2400 && h->type == STT_FUNC
2401 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2402 {
2403 (*_bfd_error_handler)
2404 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2405 input_bfd, h->root.root.string);
2406 bfd_set_error (bfd_error_bad_value);
2407 return FALSE;
2408 }
2409
2410 /* Note that sgot is not involved in this
2411 calculation. We always want the start of .got.plt. If we
2412 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2413 permitted by the ABI, we might have to change this
2414 calculation. */
2415 relocation -= htab->sgotplt->output_section->vma
2416 + htab->sgotplt->output_offset;
2417 break;
2418
2419 case R_386_GOTPC:
2420 /* Use global offset table as symbol value. */
2421 relocation = htab->sgotplt->output_section->vma
2422 + htab->sgotplt->output_offset;
2423 unresolved_reloc = FALSE;
2424 break;
2425
2426 case R_386_PLT32:
2427 /* Relocation is to the entry for this symbol in the
2428 procedure linkage table. */
2429
2430 /* Resolve a PLT32 reloc against a local symbol directly,
2431 without using the procedure linkage table. */
2432 if (h == NULL)
2433 break;
2434
2435 if (h->plt.offset == (bfd_vma) -1
2436 || htab->splt == NULL)
2437 {
2438 /* We didn't make a PLT entry for this symbol. This
2439 happens when statically linking PIC code, or when
2440 using -Bsymbolic. */
2441 break;
2442 }
2443
2444 relocation = (htab->splt->output_section->vma
2445 + htab->splt->output_offset
2446 + h->plt.offset);
2447 unresolved_reloc = FALSE;
2448 break;
2449
2450 case R_386_32:
2451 case R_386_PC32:
2452 if ((input_section->flags & SEC_ALLOC) == 0)
2453 break;
2454
2455 if ((info->shared
2456 && (h == NULL
2457 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2458 || h->root.type != bfd_link_hash_undefweak)
2459 && (r_type != R_386_PC32
2460 || !SYMBOL_CALLS_LOCAL (info, h)))
2461 || (ELIMINATE_COPY_RELOCS
2462 && !info->shared
2463 && h != NULL
2464 && h->dynindx != -1
2465 && !h->non_got_ref
2466 && ((h->def_dynamic
2467 && !h->def_regular)
2468 || h->root.type == bfd_link_hash_undefweak
2469 || h->root.type == bfd_link_hash_undefined)))
2470 {
2471 Elf_Internal_Rela outrel;
2472 bfd_byte *loc;
2473 bfd_boolean skip, relocate;
2474 asection *sreloc;
2475
2476 /* When generating a shared object, these relocations
2477 are copied into the output file to be resolved at run
2478 time. */
2479
2480 skip = FALSE;
2481 relocate = FALSE;
2482
2483 outrel.r_offset =
2484 _bfd_elf_section_offset (output_bfd, info, input_section,
2485 rel->r_offset);
2486 if (outrel.r_offset == (bfd_vma) -1)
2487 skip = TRUE;
2488 else if (outrel.r_offset == (bfd_vma) -2)
2489 skip = TRUE, relocate = TRUE;
2490 outrel.r_offset += (input_section->output_section->vma
2491 + input_section->output_offset);
2492
2493 if (skip)
2494 memset (&outrel, 0, sizeof outrel);
2495 else if (h != NULL
2496 && h->dynindx != -1
2497 && (r_type == R_386_PC32
2498 || !info->shared
2499 || !info->symbolic
2500 || !h->def_regular))
2501 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2502 else
2503 {
2504 /* This symbol is local, or marked to become local. */
2505 relocate = TRUE;
2506 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2507 }
2508
2509 sreloc = elf_section_data (input_section)->sreloc;
2510 if (sreloc == NULL)
2511 abort ();
2512
2513 loc = sreloc->contents;
2514 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2515 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2516
2517 /* If this reloc is against an external symbol, we do
2518 not want to fiddle with the addend. Otherwise, we
2519 need to include the symbol value so that it becomes
2520 an addend for the dynamic reloc. */
2521 if (! relocate)
2522 continue;
2523 }
2524 break;
2525
2526 case R_386_TLS_IE:
2527 if (info->shared)
2528 {
2529 Elf_Internal_Rela outrel;
2530 bfd_byte *loc;
2531 asection *sreloc;
2532
2533 outrel.r_offset = rel->r_offset
2534 + input_section->output_section->vma
2535 + input_section->output_offset;
2536 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2537 sreloc = elf_section_data (input_section)->sreloc;
2538 if (sreloc == NULL)
2539 abort ();
2540 loc = sreloc->contents;
2541 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2542 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2543 }
2544 /* Fall through */
2545
2546 case R_386_TLS_GD:
2547 case R_386_TLS_IE_32:
2548 case R_386_TLS_GOTIE:
2549 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2550 tls_type = GOT_UNKNOWN;
2551 if (h == NULL && local_got_offsets)
2552 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2553 else if (h != NULL)
2554 {
2555 tls_type = elf_i386_hash_entry(h)->tls_type;
2556 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2557 r_type = R_386_TLS_LE_32;
2558 }
2559 if (tls_type == GOT_TLS_IE)
2560 tls_type = GOT_TLS_IE_NEG;
2561 if (r_type == R_386_TLS_GD)
2562 {
2563 if (tls_type == GOT_TLS_IE_POS)
2564 r_type = R_386_TLS_GOTIE;
2565 else if (tls_type & GOT_TLS_IE)
2566 r_type = R_386_TLS_IE_32;
2567 }
2568
2569 if (r_type == R_386_TLS_LE_32)
2570 {
2571 BFD_ASSERT (! unresolved_reloc);
2572 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2573 {
2574 unsigned int val, type;
2575 bfd_vma roff;
2576
2577 /* GD->LE transition. */
2578 BFD_ASSERT (rel->r_offset >= 2);
2579 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2580 BFD_ASSERT (type == 0x8d || type == 0x04);
2581 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2582 BFD_ASSERT (bfd_get_8 (input_bfd,
2583 contents + rel->r_offset + 4)
2584 == 0xe8);
2585 BFD_ASSERT (rel + 1 < relend);
2586 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2587 roff = rel->r_offset + 5;
2588 val = bfd_get_8 (input_bfd,
2589 contents + rel->r_offset - 1);
2590 if (type == 0x04)
2591 {
2592 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2593 Change it into:
2594 movl %gs:0, %eax; subl $foo@tpoff, %eax
2595 (6 byte form of subl). */
2596 BFD_ASSERT (rel->r_offset >= 3);
2597 BFD_ASSERT (bfd_get_8 (input_bfd,
2598 contents + rel->r_offset - 3)
2599 == 0x8d);
2600 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2601 memcpy (contents + rel->r_offset - 3,
2602 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2603 }
2604 else
2605 {
2606 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2607 if (rel->r_offset + 10 <= input_section->size
2608 && bfd_get_8 (input_bfd,
2609 contents + rel->r_offset + 9) == 0x90)
2610 {
2611 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2612 Change it into:
2613 movl %gs:0, %eax; subl $foo@tpoff, %eax
2614 (6 byte form of subl). */
2615 memcpy (contents + rel->r_offset - 2,
2616 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2617 roff = rel->r_offset + 6;
2618 }
2619 else
2620 {
2621 /* leal foo(%reg), %eax; call ___tls_get_addr
2622 Change it into:
2623 movl %gs:0, %eax; subl $foo@tpoff, %eax
2624 (5 byte form of subl). */
2625 memcpy (contents + rel->r_offset - 2,
2626 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2627 }
2628 }
2629 bfd_put_32 (output_bfd, tpoff (info, relocation),
2630 contents + roff);
2631 /* Skip R_386_PLT32. */
2632 rel++;
2633 continue;
2634 }
2635 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2636 {
2637 unsigned int val, type;
2638
2639 /* IE->LE transition:
2640 Originally it can be one of:
2641 movl foo, %eax
2642 movl foo, %reg
2643 addl foo, %reg
2644 We change it into:
2645 movl $foo, %eax
2646 movl $foo, %reg
2647 addl $foo, %reg. */
2648 BFD_ASSERT (rel->r_offset >= 1);
2649 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2650 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2651 if (val == 0xa1)
2652 {
2653 /* movl foo, %eax. */
2654 bfd_put_8 (output_bfd, 0xb8,
2655 contents + rel->r_offset - 1);
2656 }
2657 else
2658 {
2659 BFD_ASSERT (rel->r_offset >= 2);
2660 type = bfd_get_8 (input_bfd,
2661 contents + rel->r_offset - 2);
2662 switch (type)
2663 {
2664 case 0x8b:
2665 /* movl */
2666 BFD_ASSERT ((val & 0xc7) == 0x05);
2667 bfd_put_8 (output_bfd, 0xc7,
2668 contents + rel->r_offset - 2);
2669 bfd_put_8 (output_bfd,
2670 0xc0 | ((val >> 3) & 7),
2671 contents + rel->r_offset - 1);
2672 break;
2673 case 0x03:
2674 /* addl */
2675 BFD_ASSERT ((val & 0xc7) == 0x05);
2676 bfd_put_8 (output_bfd, 0x81,
2677 contents + rel->r_offset - 2);
2678 bfd_put_8 (output_bfd,
2679 0xc0 | ((val >> 3) & 7),
2680 contents + rel->r_offset - 1);
2681 break;
2682 default:
2683 BFD_FAIL ();
2684 break;
2685 }
2686 }
2687 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2688 contents + rel->r_offset);
2689 continue;
2690 }
2691 else
2692 {
2693 unsigned int val, type;
2694
2695 /* {IE_32,GOTIE}->LE transition:
2696 Originally it can be one of:
2697 subl foo(%reg1), %reg2
2698 movl foo(%reg1), %reg2
2699 addl foo(%reg1), %reg2
2700 We change it into:
2701 subl $foo, %reg2
2702 movl $foo, %reg2 (6 byte form)
2703 addl $foo, %reg2. */
2704 BFD_ASSERT (rel->r_offset >= 2);
2705 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2706 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2707 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2708 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2709 if (type == 0x8b)
2710 {
2711 /* movl */
2712 bfd_put_8 (output_bfd, 0xc7,
2713 contents + rel->r_offset - 2);
2714 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2715 contents + rel->r_offset - 1);
2716 }
2717 else if (type == 0x2b)
2718 {
2719 /* subl */
2720 bfd_put_8 (output_bfd, 0x81,
2721 contents + rel->r_offset - 2);
2722 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2723 contents + rel->r_offset - 1);
2724 }
2725 else if (type == 0x03)
2726 {
2727 /* addl */
2728 bfd_put_8 (output_bfd, 0x81,
2729 contents + rel->r_offset - 2);
2730 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2731 contents + rel->r_offset - 1);
2732 }
2733 else
2734 BFD_FAIL ();
2735 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2736 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2737 contents + rel->r_offset);
2738 else
2739 bfd_put_32 (output_bfd, tpoff (info, relocation),
2740 contents + rel->r_offset);
2741 continue;
2742 }
2743 }
2744
2745 if (htab->sgot == NULL)
2746 abort ();
2747
2748 if (h != NULL)
2749 off = h->got.offset;
2750 else
2751 {
2752 if (local_got_offsets == NULL)
2753 abort ();
2754
2755 off = local_got_offsets[r_symndx];
2756 }
2757
2758 if ((off & 1) != 0)
2759 off &= ~1;
2760 else
2761 {
2762 Elf_Internal_Rela outrel;
2763 bfd_byte *loc;
2764 int dr_type, indx;
2765
2766 if (htab->srelgot == NULL)
2767 abort ();
2768
2769 outrel.r_offset = (htab->sgot->output_section->vma
2770 + htab->sgot->output_offset + off);
2771
2772 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2773 if (r_type == R_386_TLS_GD)
2774 dr_type = R_386_TLS_DTPMOD32;
2775 else if (tls_type == GOT_TLS_IE_POS)
2776 dr_type = R_386_TLS_TPOFF;
2777 else
2778 dr_type = R_386_TLS_TPOFF32;
2779 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2780 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2781 htab->sgot->contents + off);
2782 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2783 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2784 htab->sgot->contents + off);
2785 else
2786 bfd_put_32 (output_bfd, 0,
2787 htab->sgot->contents + off);
2788 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2789 loc = htab->srelgot->contents;
2790 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2791 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2792
2793 if (r_type == R_386_TLS_GD)
2794 {
2795 if (indx == 0)
2796 {
2797 BFD_ASSERT (! unresolved_reloc);
2798 bfd_put_32 (output_bfd,
2799 relocation - dtpoff_base (info),
2800 htab->sgot->contents + off + 4);
2801 }
2802 else
2803 {
2804 bfd_put_32 (output_bfd, 0,
2805 htab->sgot->contents + off + 4);
2806 outrel.r_info = ELF32_R_INFO (indx,
2807 R_386_TLS_DTPOFF32);
2808 outrel.r_offset += 4;
2809 htab->srelgot->reloc_count++;
2810 loc += sizeof (Elf32_External_Rel);
2811 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2812 }
2813 }
2814 else if (tls_type == GOT_TLS_IE_BOTH)
2815 {
2816 bfd_put_32 (output_bfd,
2817 indx == 0 ? relocation - dtpoff_base (info) : 0,
2818 htab->sgot->contents + off + 4);
2819 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2820 outrel.r_offset += 4;
2821 htab->srelgot->reloc_count++;
2822 loc += sizeof (Elf32_External_Rel);
2823 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2824 }
2825
2826 if (h != NULL)
2827 h->got.offset |= 1;
2828 else
2829 local_got_offsets[r_symndx] |= 1;
2830 }
2831
2832 if (off >= (bfd_vma) -2)
2833 abort ();
2834 if (r_type == ELF32_R_TYPE (rel->r_info))
2835 {
2836 bfd_vma g_o_t = htab->sgotplt->output_section->vma
2837 + htab->sgotplt->output_offset;
2838 relocation = htab->sgot->output_section->vma
2839 + htab->sgot->output_offset + off - g_o_t;
2840 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2841 && tls_type == GOT_TLS_IE_BOTH)
2842 relocation += 4;
2843 if (r_type == R_386_TLS_IE)
2844 relocation += g_o_t;
2845 unresolved_reloc = FALSE;
2846 }
2847 else
2848 {
2849 unsigned int val, type;
2850 bfd_vma roff;
2851
2852 /* GD->IE transition. */
2853 BFD_ASSERT (rel->r_offset >= 2);
2854 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2855 BFD_ASSERT (type == 0x8d || type == 0x04);
2856 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2857 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2858 == 0xe8);
2859 BFD_ASSERT (rel + 1 < relend);
2860 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2861 roff = rel->r_offset - 3;
2862 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2863 if (type == 0x04)
2864 {
2865 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2866 Change it into:
2867 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2868 BFD_ASSERT (rel->r_offset >= 3);
2869 BFD_ASSERT (bfd_get_8 (input_bfd,
2870 contents + rel->r_offset - 3)
2871 == 0x8d);
2872 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2873 val >>= 3;
2874 }
2875 else
2876 {
2877 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2878 Change it into:
2879 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2880 BFD_ASSERT (rel->r_offset + 10 <= input_section->size);
2881 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2882 BFD_ASSERT (bfd_get_8 (input_bfd,
2883 contents + rel->r_offset + 9)
2884 == 0x90);
2885 roff = rel->r_offset - 2;
2886 }
2887 memcpy (contents + roff,
2888 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2889 contents[roff + 7] = 0x80 | (val & 7);
2890 /* If foo is used only with foo@gotntpoff(%reg) and
2891 foo@indntpoff, but not with foo@gottpoff(%reg), change
2892 subl $foo@gottpoff(%reg), %eax
2893 into:
2894 addl $foo@gotntpoff(%reg), %eax. */
2895 if (r_type == R_386_TLS_GOTIE)
2896 {
2897 contents[roff + 6] = 0x03;
2898 if (tls_type == GOT_TLS_IE_BOTH)
2899 off += 4;
2900 }
2901 bfd_put_32 (output_bfd,
2902 htab->sgot->output_section->vma
2903 + htab->sgot->output_offset + off
2904 - htab->sgotplt->output_section->vma
2905 - htab->sgotplt->output_offset,
2906 contents + roff + 8);
2907 /* Skip R_386_PLT32. */
2908 rel++;
2909 continue;
2910 }
2911 break;
2912
2913 case R_386_TLS_LDM:
2914 if (! info->shared)
2915 {
2916 unsigned int val;
2917
2918 /* LD->LE transition:
2919 Ensure it is:
2920 leal foo(%reg), %eax; call ___tls_get_addr.
2921 We change it into:
2922 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2923 BFD_ASSERT (rel->r_offset >= 2);
2924 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2925 == 0x8d);
2926 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2927 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2928 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2929 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2930 == 0xe8);
2931 BFD_ASSERT (rel + 1 < relend);
2932 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2933 memcpy (contents + rel->r_offset - 2,
2934 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2935 /* Skip R_386_PLT32. */
2936 rel++;
2937 continue;
2938 }
2939
2940 if (htab->sgot == NULL)
2941 abort ();
2942
2943 off = htab->tls_ldm_got.offset;
2944 if (off & 1)
2945 off &= ~1;
2946 else
2947 {
2948 Elf_Internal_Rela outrel;
2949 bfd_byte *loc;
2950
2951 if (htab->srelgot == NULL)
2952 abort ();
2953
2954 outrel.r_offset = (htab->sgot->output_section->vma
2955 + htab->sgot->output_offset + off);
2956
2957 bfd_put_32 (output_bfd, 0,
2958 htab->sgot->contents + off);
2959 bfd_put_32 (output_bfd, 0,
2960 htab->sgot->contents + off + 4);
2961 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2962 loc = htab->srelgot->contents;
2963 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2964 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2965 htab->tls_ldm_got.offset |= 1;
2966 }
2967 relocation = htab->sgot->output_section->vma
2968 + htab->sgot->output_offset + off
2969 - htab->sgotplt->output_section->vma
2970 - htab->sgotplt->output_offset;
2971 unresolved_reloc = FALSE;
2972 break;
2973
2974 case R_386_TLS_LDO_32:
2975 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2976 relocation -= dtpoff_base (info);
2977 else
2978 /* When converting LDO to LE, we must negate. */
2979 relocation = -tpoff (info, relocation);
2980 break;
2981
2982 case R_386_TLS_LE_32:
2983 case R_386_TLS_LE:
2984 if (info->shared)
2985 {
2986 Elf_Internal_Rela outrel;
2987 asection *sreloc;
2988 bfd_byte *loc;
2989 int indx;
2990
2991 outrel.r_offset = rel->r_offset
2992 + input_section->output_section->vma
2993 + input_section->output_offset;
2994 if (h != NULL && h->dynindx != -1)
2995 indx = h->dynindx;
2996 else
2997 indx = 0;
2998 if (r_type == R_386_TLS_LE_32)
2999 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3000 else
3001 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3002 sreloc = elf_section_data (input_section)->sreloc;
3003 if (sreloc == NULL)
3004 abort ();
3005 loc = sreloc->contents;
3006 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3007 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3008 if (indx)
3009 continue;
3010 else if (r_type == R_386_TLS_LE_32)
3011 relocation = dtpoff_base (info) - relocation;
3012 else
3013 relocation -= dtpoff_base (info);
3014 }
3015 else if (r_type == R_386_TLS_LE_32)
3016 relocation = tpoff (info, relocation);
3017 else
3018 relocation = -tpoff (info, relocation);
3019 break;
3020
3021 default:
3022 break;
3023 }
3024
3025 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3026 because such sections are not SEC_ALLOC and thus ld.so will
3027 not process them. */
3028 if (unresolved_reloc
3029 && !((input_section->flags & SEC_DEBUGGING) != 0
3030 && h->def_dynamic))
3031 {
3032 (*_bfd_error_handler)
3033 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
3034 input_bfd,
3035 input_section,
3036 (long) rel->r_offset,
3037 h->root.root.string);
3038 return FALSE;
3039 }
3040
3041 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3042 contents, rel->r_offset,
3043 relocation, 0);
3044
3045 if (r != bfd_reloc_ok)
3046 {
3047 const char *name;
3048
3049 if (h != NULL)
3050 name = h->root.root.string;
3051 else
3052 {
3053 name = bfd_elf_string_from_elf_section (input_bfd,
3054 symtab_hdr->sh_link,
3055 sym->st_name);
3056 if (name == NULL)
3057 return FALSE;
3058 if (*name == '\0')
3059 name = bfd_section_name (input_bfd, sec);
3060 }
3061
3062 if (r == bfd_reloc_overflow)
3063 {
3064 if (! ((*info->callbacks->reloc_overflow)
3065 (info, (h ? &h->root : NULL), name, howto->name,
3066 (bfd_vma) 0, input_bfd, input_section,
3067 rel->r_offset)))
3068 return FALSE;
3069 }
3070 else
3071 {
3072 (*_bfd_error_handler)
3073 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3074 input_bfd, input_section,
3075 (long) rel->r_offset, name, (int) r);
3076 return FALSE;
3077 }
3078 }
3079 }
3080
3081 return TRUE;
3082}
3083
3084/* Finish up dynamic symbol handling. We set the contents of various
3085 dynamic sections here. */
3086
3087static bfd_boolean
3088elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3089 struct bfd_link_info *info,
3090 struct elf_link_hash_entry *h,
3091 Elf_Internal_Sym *sym)
3092{
3093 struct elf_i386_link_hash_table *htab;
3094
3095 htab = elf_i386_hash_table (info);
3096
3097 if (h->plt.offset != (bfd_vma) -1)
3098 {
3099 bfd_vma plt_index;
3100 bfd_vma got_offset;
3101 Elf_Internal_Rela rel;
3102 bfd_byte *loc;
3103
3104 /* This symbol has an entry in the procedure linkage table. Set
3105 it up. */
3106
3107 if (h->dynindx == -1
3108 || htab->splt == NULL
3109 || htab->sgotplt == NULL
3110 || htab->srelplt == NULL)
3111 abort ();
3112
3113 /* Get the index in the procedure linkage table which
3114 corresponds to this symbol. This is the index of this symbol
3115 in all the symbols for which we are making plt entries. The
3116 first entry in the procedure linkage table is reserved. */
3117 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3118
3119 /* Get the offset into the .got table of the entry that
3120 corresponds to this function. Each .got entry is 4 bytes.
3121 The first three are reserved. */
3122 got_offset = (plt_index + 3) * 4;
3123
3124 /* Fill in the entry in the procedure linkage table. */
3125 if (! info->shared)
3126 {
3127 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3128 PLT_ENTRY_SIZE);
3129 bfd_put_32 (output_bfd,
3130 (htab->sgotplt->output_section->vma
3131 + htab->sgotplt->output_offset
3132 + got_offset),
3133 htab->splt->contents + h->plt.offset + 2);
3134
3135 if (htab->is_vxworks)
3136 {
3137 int s, k, reloc_index;
3138
3139 /* Create the R_386_32 relocation referencing the GOT
3140 for this PLT entry. */
3141
3142 /* S: Current slot number (zero-based). */
3143 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3144 /* K: Number of relocations for PLTResolve. */
3145 if (info->shared)
3146 k = PLTRESOLVE_RELOCS_SHLIB;
3147 else
3148 k = PLTRESOLVE_RELOCS;
3149 /* Skip the PLTresolve relocations, and the relocations for
3150 the other PLT slots. */
3151 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3152 loc = (htab->srelplt2->contents + reloc_index
3153 * sizeof (Elf32_External_Rel));
3154
3155 rel.r_offset = (htab->splt->output_section->vma
3156 + htab->splt->output_offset
3157 + h->plt.offset + 2),
3158 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3159 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3160
3161 /* Create the R_386_32 relocation referencing the beginning of
3162 the PLT for this GOT entry. */
3163 rel.r_offset = (htab->sgotplt->output_section->vma
3164 + htab->sgotplt->output_offset
3165 + got_offset);
3166 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3167 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3168 loc + sizeof (Elf32_External_Rel));
3169 }
3170 }
3171 else
3172 {
3173 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3174 PLT_ENTRY_SIZE);
3175 bfd_put_32 (output_bfd, got_offset,
3176 htab->splt->contents + h->plt.offset + 2);
3177 }
3178
3179 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3180 htab->splt->contents + h->plt.offset + 7);
3181 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3182 htab->splt->contents + h->plt.offset + 12);
3183
3184 /* Fill in the entry in the global offset table. */
3185 bfd_put_32 (output_bfd,
3186 (htab->splt->output_section->vma
3187 + htab->splt->output_offset
3188 + h->plt.offset
3189 + 6),
3190 htab->sgotplt->contents + got_offset);
3191
3192 /* Fill in the entry in the .rel.plt section. */
3193 rel.r_offset = (htab->sgotplt->output_section->vma
3194 + htab->sgotplt->output_offset
3195 + got_offset);
3196 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3197 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3198 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3199
3200 if (!h->def_regular)
3201 {
3202 /* Mark the symbol as undefined, rather than as defined in
3203 the .plt section. Leave the value if there were any
3204 relocations where pointer equality matters (this is a clue
3205 for the dynamic linker, to make function pointer
3206 comparisons work between an application and shared
3207 library), otherwise set it to zero. If a function is only
3208 called from a binary, there is no need to slow down
3209 shared libraries because of that. */
3210 sym->st_shndx = SHN_UNDEF;
3211 if (!h->pointer_equality_needed)
3212 sym->st_value = 0;
3213 }
3214 }
3215
3216 if (h->got.offset != (bfd_vma) -1
3217 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3218 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3219 {
3220 Elf_Internal_Rela rel;
3221 bfd_byte *loc;
3222
3223 /* This symbol has an entry in the global offset table. Set it
3224 up. */
3225
3226 if (htab->sgot == NULL || htab->srelgot == NULL)
3227 abort ();
3228
3229 rel.r_offset = (htab->sgot->output_section->vma
3230 + htab->sgot->output_offset
3231 + (h->got.offset & ~(bfd_vma) 1));
3232
3233 /* If this is a static link, or it is a -Bsymbolic link and the
3234 symbol is defined locally or was forced to be local because
3235 of a version file, we just want to emit a RELATIVE reloc.
3236 The entry in the global offset table will already have been
3237 initialized in the relocate_section function. */
3238 if (info->shared
3239 && SYMBOL_REFERENCES_LOCAL (info, h))
3240 {
3241 BFD_ASSERT((h->got.offset & 1) != 0);
3242 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3243 }
3244 else
3245 {
3246 BFD_ASSERT((h->got.offset & 1) == 0);
3247 bfd_put_32 (output_bfd, (bfd_vma) 0,
3248 htab->sgot->contents + h->got.offset);
3249 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3250 }
3251
3252 loc = htab->srelgot->contents;
3253 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3254 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3255 }
3256
3257 if (h->needs_copy)
3258 {
3259 Elf_Internal_Rela rel;
3260 bfd_byte *loc;
3261
3262 /* This symbol needs a copy reloc. Set it up. */
3263
3264 if (h->dynindx == -1
3265 || (h->root.type != bfd_link_hash_defined
3266 && h->root.type != bfd_link_hash_defweak)
3267 || htab->srelbss == NULL)
3268 abort ();
3269
3270 rel.r_offset = (h->root.u.def.value
3271 + h->root.u.def.section->output_section->vma
3272 + h->root.u.def.section->output_offset);
3273 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3274 loc = htab->srelbss->contents;
3275 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3276 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3277 }
3278
3279 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3280 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3281 is relative to the ".got" section. */
3282 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3283 || (strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3284 && !htab->is_vxworks))
3285 sym->st_shndx = SHN_ABS;
3286
3287 return TRUE;
3288}
3289
3290/* Used to decide how to sort relocs in an optimal manner for the
3291 dynamic linker, before writing them out. */
3292
3293static enum elf_reloc_type_class
3294elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3295{
3296 switch (ELF32_R_TYPE (rela->r_info))
3297 {
3298 case R_386_RELATIVE:
3299 return reloc_class_relative;
3300 case R_386_JUMP_SLOT:
3301 return reloc_class_plt;
3302 case R_386_COPY:
3303 return reloc_class_copy;
3304 default:
3305 return reloc_class_normal;
3306 }
3307}
3308
3309/* Finish up the dynamic sections. */
3310
3311static bfd_boolean
3312elf_i386_finish_dynamic_sections (bfd *output_bfd,
3313 struct bfd_link_info *info)
3314{
3315 struct elf_i386_link_hash_table *htab;
3316 bfd *dynobj;
3317 asection *sdyn;
3318
3319 htab = elf_i386_hash_table (info);
3320 dynobj = htab->elf.dynobj;
3321 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3322
3323 if (htab->elf.dynamic_sections_created)
3324 {
3325 Elf32_External_Dyn *dyncon, *dynconend;
3326
3327 if (sdyn == NULL || htab->sgot == NULL)
3328 abort ();
3329
3330 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3331 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3332 for (; dyncon < dynconend; dyncon++)
3333 {
3334 Elf_Internal_Dyn dyn;
3335 asection *s;
3336
3337 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3338
3339 switch (dyn.d_tag)
3340 {
3341 default:
3342 continue;
3343
3344 case DT_PLTGOT:
3345 s = htab->sgotplt;
3346 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3347 break;
3348
3349 case DT_JMPREL:
3350 s = htab->srelplt;
3351 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3352 break;
3353
3354 case DT_PLTRELSZ:
3355 s = htab->srelplt;
3356 dyn.d_un.d_val = s->size;
3357 break;
3358
3359 case DT_RELSZ:
3360 /* My reading of the SVR4 ABI indicates that the
3361 procedure linkage table relocs (DT_JMPREL) should be
3362 included in the overall relocs (DT_REL). This is
3363 what Solaris does. However, UnixWare can not handle
3364 that case. Therefore, we override the DT_RELSZ entry
3365 here to make it not include the JMPREL relocs. */
3366 s = htab->srelplt;
3367 if (s == NULL)
3368 continue;
3369 dyn.d_un.d_val -= s->size;
3370 break;
3371
3372 case DT_REL:
3373 /* We may not be using the standard ELF linker script.
3374 If .rel.plt is the first .rel section, we adjust
3375 DT_REL to not include it. */
3376 s = htab->srelplt;
3377 if (s == NULL)
3378 continue;
3379 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3380 continue;
3381 dyn.d_un.d_ptr += s->size;
3382 break;
3383 }
3384
3385 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3386 }
3387
3388 /* Fill in the first entry in the procedure linkage table. */
3389 if (htab->splt && htab->splt->size > 0)
3390 {
3391 if (info->shared)
3392 {
3393 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3394 sizeof (elf_i386_pic_plt0_entry));
3395 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3396 htab->plt0_pad_byte,
3397 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3398 }
3399 else
3400 {
3401 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3402 sizeof(elf_i386_plt0_entry));
3403 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3404 htab->plt0_pad_byte,
3405 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3406 bfd_put_32 (output_bfd,
3407 (htab->sgotplt->output_section->vma
3408 + htab->sgotplt->output_offset
3409 + 4),
3410 htab->splt->contents + 2);
3411 bfd_put_32 (output_bfd,
3412 (htab->sgotplt->output_section->vma
3413 + htab->sgotplt->output_offset
3414 + 8),
3415 htab->splt->contents + 8);
3416
3417 if (htab->is_vxworks)
3418 {
3419 Elf_Internal_Rela rel;
3420 struct elf_link_hash_entry *hgot;
3421
3422 /* The VxWorks GOT is relocated by the dynamic linker.
3423 Therefore, we must emit relocations rather than
3424 simply computing the values now. */
3425 hgot = elf_link_hash_lookup (elf_hash_table (info),
3426 "_GLOBAL_OFFSET_TABLE_",
3427 FALSE, FALSE, FALSE);
3428 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3429 On IA32 we use REL relocations so the addend goes in
3430 the PLT directly. */
3431 rel.r_offset = (htab->splt->output_section->vma
3432 + htab->splt->output_offset
3433 + 2);
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 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3438 rel.r_offset = (htab->splt->output_section->vma
3439 + htab->splt->output_offset
3440 + 8);
3441 rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32);
3442 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3443 htab->srelplt2->contents +
3444 sizeof (Elf32_External_Rel));
3445 }
3446 }
3447
3448 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3449 really seem like the right value. */
3450 elf_section_data (htab->splt->output_section)
3451 ->this_hdr.sh_entsize = 4;
3452
3453 /* Correct the .rel.plt.unloaded relocations. */
3454 if (htab->is_vxworks && !info->shared)
3455 {
3456 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3457 unsigned char *p;
3458
3459 p = htab->srelplt2->contents;
3460 if (info->shared)
3461 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3462 else
3463 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3464
3465 for (; num_plts; num_plts--)
3466 {
3467 Elf_Internal_Rela rel;
3468 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3469 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3470 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3471 p += sizeof (Elf32_External_Rel);
3472
3473 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3474 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3475 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3476 p += sizeof (Elf32_External_Rel);
3477 }
3478 }
3479 }
3480 }
3481
3482 if (htab->sgotplt)
3483 {
3484 /* Fill in the first three entries in the global offset table. */
3485 if (htab->sgotplt->size > 0)
3486 {
3487 bfd_put_32 (output_bfd,
3488 (sdyn == NULL ? 0
3489 : sdyn->output_section->vma + sdyn->output_offset),
3490 htab->sgotplt->contents);
3491 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3492 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3493 }
3494
3495 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3496 }
3497
3498 if (htab->sgot && htab->sgot->size > 0)
3499 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3500
3501 return TRUE;
3502}
3503
3504/* Return address for Ith PLT stub in section PLT, for relocation REL
3505 or (bfd_vma) -1 if it should not be included. */
3506
3507static bfd_vma
3508elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3509 const arelent *rel ATTRIBUTE_UNUSED)
3510{
3511 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3512}
3513
3514
3515#define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3516#define TARGET_LITTLE_NAME "elf32-i386"
3517#define ELF_ARCH bfd_arch_i386
3518#define ELF_MACHINE_CODE EM_386
3519#define ELF_MAXPAGESIZE 0x1000
3520
3521#define elf_backend_can_gc_sections 1
3522#define elf_backend_can_refcount 1
3523#define elf_backend_want_got_plt 1
3524#define elf_backend_plt_readonly 1
3525#define elf_backend_want_plt_sym 0
3526#define elf_backend_got_header_size 12
3527
3528/* Support RELA for objdump of prelink objects. */
3529#define elf_info_to_howto elf_i386_info_to_howto_rel
3530#define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3531
3532#define bfd_elf32_mkobject elf_i386_mkobject
3533
3534#define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3535#define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3536#define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3537
3538#define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3539#define elf_backend_check_relocs elf_i386_check_relocs
3540#define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3541#define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3542#define elf_backend_fake_sections elf_i386_fake_sections
3543#define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3544#define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3545#define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3546#define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3547#define elf_backend_grok_prstatus elf_i386_grok_prstatus
3548#define elf_backend_grok_psinfo elf_i386_grok_psinfo
3549#define elf_backend_reloc_type_class elf_i386_reloc_type_class
3550#define elf_backend_relocate_section elf_i386_relocate_section
3551#define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3552#define elf_backend_plt_sym_val elf_i386_plt_sym_val
3553
3554#include "elf32-target.h"
3555
3556/* FreeBSD support. */
3557
3558#undef TARGET_LITTLE_SYM
3559#define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3560#undef TARGET_LITTLE_NAME
3561#define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3562
3563/* The kernel recognizes executables as valid only if they carry a
3564 "FreeBSD" label in the ELF header. So we put this label on all
3565 executables and (for simplicity) also all other object files. */
3566
3567static void
3568elf_i386_post_process_headers (bfd *abfd,
3569 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3570{
3571 Elf_Internal_Ehdr *i_ehdrp;
3572
3573 i_ehdrp = elf_elfheader (abfd);
3574
3575 /* Put an ABI label supported by FreeBSD >= 4.1. */
3576 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3577#ifdef OLD_FREEBSD_ABI_LABEL
3578 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3579 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3580#endif
3581}
3582
3583#undef elf_backend_post_process_headers
3584#define elf_backend_post_process_headers elf_i386_post_process_headers
3585#undef elf32_bed
3586#define elf32_bed elf32_i386_fbsd_bed
3587
3588#include "elf32-target.h"
3589
3590/* VxWorks support. */
3591
3592#undef TARGET_LITTLE_SYM
3593#define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
3594#undef TARGET_LITTLE_NAME
3595#define TARGET_LITTLE_NAME "elf32-i386-vxworks"
3596
3597
3598/* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
3599
3600static struct bfd_link_hash_table *
3601elf_i386_vxworks_link_hash_table_create (bfd *abfd)
3602{
3603 struct bfd_link_hash_table *ret;
3604 struct elf_i386_link_hash_table *htab;
3605
3606 ret = elf_i386_link_hash_table_create (abfd);
3607 if (ret)
3608 {
3609 htab = (struct elf_i386_link_hash_table *) ret;
3610 htab->is_vxworks = 1;
3611 htab->plt0_pad_byte = 0x90;
3612 }
3613
3614 return ret;
3615}
3616
3617
3618/* Tweak magic VxWorks symbols as they are written to the output file. */
3619static bfd_boolean
3620elf_i386_vxworks_link_output_symbol_hook (struct bfd_link_info *info
3621 ATTRIBUTE_UNUSED,
3622 const char *name,
3623 Elf_Internal_Sym *sym,
3624 asection *input_sec ATTRIBUTE_UNUSED,
3625 struct elf_link_hash_entry *h
3626 ATTRIBUTE_UNUSED)
3627{
3628 /* Ignore the first dummy symbol. */
3629 if (!name)
3630 return TRUE;
3631
3632 return elf_vxworks_link_output_symbol_hook (name, sym);
3633}
3634
3635#undef elf_backend_post_process_headers
3636#undef bfd_elf32_bfd_link_hash_table_create
3637#define bfd_elf32_bfd_link_hash_table_create \
3638 elf_i386_vxworks_link_hash_table_create
3639#undef elf_backend_add_symbol_hook
3640#define elf_backend_add_symbol_hook \
3641 elf_vxworks_add_symbol_hook
3642#undef elf_backend_link_output_symbol_hook
3643#define elf_backend_link_output_symbol_hook \
3644 elf_i386_vxworks_link_output_symbol_hook
3645#undef elf_backend_emit_relocs
3646#define elf_backend_emit_relocs elf_vxworks_emit_relocs
3647#undef elf_backend_final_write_processing
3648#define elf_backend_final_write_processing \
3649 elf_vxworks_final_write_processing
3650
3651/* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
3652 define it. */
3653#undef elf_backend_want_plt_sym
3654#define elf_backend_want_plt_sym 1
3655
3656#undef elf32_bed
3657#define elf32_bed elf32_i386_vxworks_bed
3658
3659#include "elf32-target.h"
GDB Binutils - Deliverables
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