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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
3 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26
27 /* 386 uses REL relocations instead of RELA. */
28 #define USE_REL 1
29
30 #include "elf/i386.h"
31
32 static reloc_howto_type elf_howto_table[]=
33 {
34 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128
129 /* Another gap. */
130 #define R_386_tls (R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
131 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
132
133 /* GNU extension to record C++ vtable hierarchy. */
134 HOWTO (R_386_GNU_VTINHERIT, /* type */
135 0, /* rightshift */
136 2, /* size (0 = byte, 1 = short, 2 = long) */
137 0, /* bitsize */
138 FALSE, /* pc_relative */
139 0, /* bitpos */
140 complain_overflow_dont, /* complain_on_overflow */
141 NULL, /* special_function */
142 "R_386_GNU_VTINHERIT", /* name */
143 FALSE, /* partial_inplace */
144 0, /* src_mask */
145 0, /* dst_mask */
146 FALSE), /* pcrel_offset */
147
148 /* GNU extension to record C++ vtable member usage. */
149 HOWTO (R_386_GNU_VTENTRY, /* type */
150 0, /* rightshift */
151 2, /* size (0 = byte, 1 = short, 2 = long) */
152 0, /* bitsize */
153 FALSE, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
157 "R_386_GNU_VTENTRY", /* name */
158 FALSE, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
161 FALSE) /* pcrel_offset */
162
163 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
164
165 };
166
167 #ifdef DEBUG_GEN_RELOC
168 #define TRACE(str) \
169 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
170 #else
171 #define TRACE(str)
172 #endif
173
174 static reloc_howto_type *
175 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
176 bfd_reloc_code_real_type code)
177 {
178 switch (code)
179 {
180 case BFD_RELOC_NONE:
181 TRACE ("BFD_RELOC_NONE");
182 return &elf_howto_table[R_386_NONE];
183
184 case BFD_RELOC_32:
185 TRACE ("BFD_RELOC_32");
186 return &elf_howto_table[R_386_32];
187
188 case BFD_RELOC_CTOR:
189 TRACE ("BFD_RELOC_CTOR");
190 return &elf_howto_table[R_386_32];
191
192 case BFD_RELOC_32_PCREL:
193 TRACE ("BFD_RELOC_PC32");
194 return &elf_howto_table[R_386_PC32];
195
196 case BFD_RELOC_386_GOT32:
197 TRACE ("BFD_RELOC_386_GOT32");
198 return &elf_howto_table[R_386_GOT32];
199
200 case BFD_RELOC_386_PLT32:
201 TRACE ("BFD_RELOC_386_PLT32");
202 return &elf_howto_table[R_386_PLT32];
203
204 case BFD_RELOC_386_COPY:
205 TRACE ("BFD_RELOC_386_COPY");
206 return &elf_howto_table[R_386_COPY];
207
208 case BFD_RELOC_386_GLOB_DAT:
209 TRACE ("BFD_RELOC_386_GLOB_DAT");
210 return &elf_howto_table[R_386_GLOB_DAT];
211
212 case BFD_RELOC_386_JUMP_SLOT:
213 TRACE ("BFD_RELOC_386_JUMP_SLOT");
214 return &elf_howto_table[R_386_JUMP_SLOT];
215
216 case BFD_RELOC_386_RELATIVE:
217 TRACE ("BFD_RELOC_386_RELATIVE");
218 return &elf_howto_table[R_386_RELATIVE];
219
220 case BFD_RELOC_386_GOTOFF:
221 TRACE ("BFD_RELOC_386_GOTOFF");
222 return &elf_howto_table[R_386_GOTOFF];
223
224 case BFD_RELOC_386_GOTPC:
225 TRACE ("BFD_RELOC_386_GOTPC");
226 return &elf_howto_table[R_386_GOTPC];
227
228 /* These relocs are a GNU extension. */
229 case BFD_RELOC_386_TLS_TPOFF:
230 TRACE ("BFD_RELOC_386_TLS_TPOFF");
231 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
232
233 case BFD_RELOC_386_TLS_IE:
234 TRACE ("BFD_RELOC_386_TLS_IE");
235 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
236
237 case BFD_RELOC_386_TLS_GOTIE:
238 TRACE ("BFD_RELOC_386_TLS_GOTIE");
239 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
240
241 case BFD_RELOC_386_TLS_LE:
242 TRACE ("BFD_RELOC_386_TLS_LE");
243 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
244
245 case BFD_RELOC_386_TLS_GD:
246 TRACE ("BFD_RELOC_386_TLS_GD");
247 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
248
249 case BFD_RELOC_386_TLS_LDM:
250 TRACE ("BFD_RELOC_386_TLS_LDM");
251 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
252
253 case BFD_RELOC_16:
254 TRACE ("BFD_RELOC_16");
255 return &elf_howto_table[R_386_16 - R_386_ext_offset];
256
257 case BFD_RELOC_16_PCREL:
258 TRACE ("BFD_RELOC_16_PCREL");
259 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
260
261 case BFD_RELOC_8:
262 TRACE ("BFD_RELOC_8");
263 return &elf_howto_table[R_386_8 - R_386_ext_offset];
264
265 case BFD_RELOC_8_PCREL:
266 TRACE ("BFD_RELOC_8_PCREL");
267 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
268
269 /* Common with Sun TLS implementation. */
270 case BFD_RELOC_386_TLS_LDO_32:
271 TRACE ("BFD_RELOC_386_TLS_LDO_32");
272 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
273
274 case BFD_RELOC_386_TLS_IE_32:
275 TRACE ("BFD_RELOC_386_TLS_IE_32");
276 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
277
278 case BFD_RELOC_386_TLS_LE_32:
279 TRACE ("BFD_RELOC_386_TLS_LE_32");
280 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
281
282 case BFD_RELOC_386_TLS_DTPMOD32:
283 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
284 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
285
286 case BFD_RELOC_386_TLS_DTPOFF32:
287 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
288 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
289
290 case BFD_RELOC_386_TLS_TPOFF32:
291 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
292 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
293
294 case BFD_RELOC_VTABLE_INHERIT:
295 TRACE ("BFD_RELOC_VTABLE_INHERIT");
296 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
297
298 case BFD_RELOC_VTABLE_ENTRY:
299 TRACE ("BFD_RELOC_VTABLE_ENTRY");
300 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
301
302 default:
303 break;
304 }
305
306 TRACE ("Unknown");
307 return 0;
308 }
309
310 static void
311 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
312 arelent *cache_ptr,
313 Elf_Internal_Rela *dst)
314 {
315 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
316 unsigned int indx;
317
318 if ((indx = r_type) >= R_386_standard
319 && ((indx = r_type - R_386_ext_offset) - R_386_standard
320 >= R_386_ext - R_386_standard)
321 && ((indx = r_type - R_386_tls_offset) - R_386_ext
322 >= R_386_tls - R_386_ext)
323 && ((indx = r_type - R_386_vt_offset) - R_386_tls
324 >= R_386_vt - R_386_tls))
325 {
326 (*_bfd_error_handler) (_("%s: invalid relocation type %d"),
327 bfd_archive_filename (abfd), (int) r_type);
328 indx = R_386_NONE;
329 }
330 cache_ptr->howto = &elf_howto_table[indx];
331 }
332
333 /* Return whether a symbol name implies a local label. The UnixWare
334 2.1 cc generates temporary symbols that start with .X, so we
335 recognize them here. FIXME: do other SVR4 compilers also use .X?.
336 If so, we should move the .X recognition into
337 _bfd_elf_is_local_label_name. */
338
339 static bfd_boolean
340 elf_i386_is_local_label_name (bfd *abfd, const char *name)
341 {
342 if (name[0] == '.' && name[1] == 'X')
343 return TRUE;
344
345 return _bfd_elf_is_local_label_name (abfd, name);
346 }
347 \f
348 /* Support for core dump NOTE sections. */
349 static bfd_boolean
350 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
351 {
352 int offset;
353 size_t raw_size;
354
355 switch (note->descsz)
356 {
357 default:
358 return FALSE;
359
360 case 144: /* Linux/i386 */
361 /* pr_cursig */
362 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
363
364 /* pr_pid */
365 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
366
367 /* pr_reg */
368 offset = 72;
369 raw_size = 68;
370
371 break;
372 }
373
374 /* Make a ".reg/999" section. */
375 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
376 raw_size, note->descpos + offset);
377 }
378
379 static bfd_boolean
380 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
381 {
382 switch (note->descsz)
383 {
384 default:
385 return FALSE;
386
387 case 124: /* Linux/i386 elf_prpsinfo */
388 elf_tdata (abfd)->core_program
389 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
390 elf_tdata (abfd)->core_command
391 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
392 }
393
394 /* Note that for some reason, a spurious space is tacked
395 onto the end of the args in some (at least one anyway)
396 implementations, so strip it off if it exists. */
397
398 {
399 char *command = elf_tdata (abfd)->core_command;
400 int n = strlen (command);
401
402 if (0 < n && command[n - 1] == ' ')
403 command[n - 1] = '\0';
404 }
405
406 return TRUE;
407 }
408 \f
409 /* Functions for the i386 ELF linker.
410
411 In order to gain some understanding of code in this file without
412 knowing all the intricate details of the linker, note the
413 following:
414
415 Functions named elf_i386_* are called by external routines, other
416 functions are only called locally. elf_i386_* functions appear
417 in this file more or less in the order in which they are called
418 from external routines. eg. elf_i386_check_relocs is called
419 early in the link process, elf_i386_finish_dynamic_sections is
420 one of the last functions. */
421
422
423 /* The name of the dynamic interpreter. This is put in the .interp
424 section. */
425
426 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
427
428 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
429 copying dynamic variables from a shared lib into an app's dynbss
430 section, and instead use a dynamic relocation to point into the
431 shared lib. */
432 #define ELIMINATE_COPY_RELOCS 1
433
434 /* The size in bytes of an entry in the procedure linkage table. */
435
436 #define PLT_ENTRY_SIZE 16
437
438 /* The first entry in an absolute procedure linkage table looks like
439 this. See the SVR4 ABI i386 supplement to see how this works. */
440
441 static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] =
442 {
443 0xff, 0x35, /* pushl contents of address */
444 0, 0, 0, 0, /* replaced with address of .got + 4. */
445 0xff, 0x25, /* jmp indirect */
446 0, 0, 0, 0, /* replaced with address of .got + 8. */
447 0, 0, 0, 0 /* pad out to 16 bytes. */
448 };
449
450 /* Subsequent entries in an absolute procedure linkage table look like
451 this. */
452
453 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
454 {
455 0xff, 0x25, /* jmp indirect */
456 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
457 0x68, /* pushl immediate */
458 0, 0, 0, 0, /* replaced with offset into relocation table. */
459 0xe9, /* jmp relative */
460 0, 0, 0, 0 /* replaced with offset to start of .plt. */
461 };
462
463 /* The first entry in a PIC procedure linkage table look like this. */
464
465 static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] =
466 {
467 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
468 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
469 0, 0, 0, 0 /* pad out to 16 bytes. */
470 };
471
472 /* Subsequent entries in a PIC procedure linkage table look like this. */
473
474 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
475 {
476 0xff, 0xa3, /* jmp *offset(%ebx) */
477 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
478 0x68, /* pushl immediate */
479 0, 0, 0, 0, /* replaced with offset into relocation table. */
480 0xe9, /* jmp relative */
481 0, 0, 0, 0 /* replaced with offset to start of .plt. */
482 };
483
484 /* The i386 linker needs to keep track of the number of relocs that it
485 decides to copy as dynamic relocs in check_relocs for each symbol.
486 This is so that it can later discard them if they are found to be
487 unnecessary. We store the information in a field extending the
488 regular ELF linker hash table. */
489
490 struct elf_i386_dyn_relocs
491 {
492 struct elf_i386_dyn_relocs *next;
493
494 /* The input section of the reloc. */
495 asection *sec;
496
497 /* Total number of relocs copied for the input section. */
498 bfd_size_type count;
499
500 /* Number of pc-relative relocs copied for the input section. */
501 bfd_size_type pc_count;
502 };
503
504 /* i386 ELF linker hash entry. */
505
506 struct elf_i386_link_hash_entry
507 {
508 struct elf_link_hash_entry elf;
509
510 /* Track dynamic relocs copied for this symbol. */
511 struct elf_i386_dyn_relocs *dyn_relocs;
512
513 #define GOT_UNKNOWN 0
514 #define GOT_NORMAL 1
515 #define GOT_TLS_GD 2
516 #define GOT_TLS_IE 4
517 #define GOT_TLS_IE_POS 5
518 #define GOT_TLS_IE_NEG 6
519 #define GOT_TLS_IE_BOTH 7
520 unsigned char tls_type;
521 };
522
523 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
524
525 struct elf_i386_obj_tdata
526 {
527 struct elf_obj_tdata root;
528
529 /* tls_type for each local got entry. */
530 char *local_got_tls_type;
531 };
532
533 #define elf_i386_tdata(abfd) \
534 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
535
536 #define elf_i386_local_got_tls_type(abfd) \
537 (elf_i386_tdata (abfd)->local_got_tls_type)
538
539 static bfd_boolean
540 elf_i386_mkobject (bfd *abfd)
541 {
542 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
543 abfd->tdata.any = bfd_zalloc (abfd, amt);
544 if (abfd->tdata.any == NULL)
545 return FALSE;
546 return TRUE;
547 }
548
549 /* i386 ELF linker hash table. */
550
551 struct elf_i386_link_hash_table
552 {
553 struct elf_link_hash_table elf;
554
555 /* Short-cuts to get to dynamic linker sections. */
556 asection *sgot;
557 asection *sgotplt;
558 asection *srelgot;
559 asection *splt;
560 asection *srelplt;
561 asection *sdynbss;
562 asection *srelbss;
563
564 union {
565 bfd_signed_vma refcount;
566 bfd_vma offset;
567 } tls_ldm_got;
568
569 /* Small local sym to section mapping cache. */
570 struct sym_sec_cache sym_sec;
571 };
572
573 /* Get the i386 ELF linker hash table from a link_info structure. */
574
575 #define elf_i386_hash_table(p) \
576 ((struct elf_i386_link_hash_table *) ((p)->hash))
577
578 /* Create an entry in an i386 ELF linker hash table. */
579
580 static struct bfd_hash_entry *
581 link_hash_newfunc (struct bfd_hash_entry *entry,
582 struct bfd_hash_table *table,
583 const char *string)
584 {
585 /* Allocate the structure if it has not already been allocated by a
586 subclass. */
587 if (entry == NULL)
588 {
589 entry = bfd_hash_allocate (table,
590 sizeof (struct elf_i386_link_hash_entry));
591 if (entry == NULL)
592 return entry;
593 }
594
595 /* Call the allocation method of the superclass. */
596 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
597 if (entry != NULL)
598 {
599 struct elf_i386_link_hash_entry *eh;
600
601 eh = (struct elf_i386_link_hash_entry *) entry;
602 eh->dyn_relocs = NULL;
603 eh->tls_type = GOT_UNKNOWN;
604 }
605
606 return entry;
607 }
608
609 /* Create an i386 ELF linker hash table. */
610
611 static struct bfd_link_hash_table *
612 elf_i386_link_hash_table_create (bfd *abfd)
613 {
614 struct elf_i386_link_hash_table *ret;
615 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
616
617 ret = bfd_malloc (amt);
618 if (ret == NULL)
619 return NULL;
620
621 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
622 {
623 free (ret);
624 return NULL;
625 }
626
627 ret->sgot = NULL;
628 ret->sgotplt = NULL;
629 ret->srelgot = NULL;
630 ret->splt = NULL;
631 ret->srelplt = NULL;
632 ret->sdynbss = NULL;
633 ret->srelbss = NULL;
634 ret->tls_ldm_got.refcount = 0;
635 ret->sym_sec.abfd = NULL;
636
637 return &ret->elf.root;
638 }
639
640 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
641 shortcuts to them in our hash table. */
642
643 static bfd_boolean
644 create_got_section (bfd *dynobj, struct bfd_link_info *info)
645 {
646 struct elf_i386_link_hash_table *htab;
647
648 if (! _bfd_elf_create_got_section (dynobj, info))
649 return FALSE;
650
651 htab = elf_i386_hash_table (info);
652 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
653 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
654 if (!htab->sgot || !htab->sgotplt)
655 abort ();
656
657 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
658 if (htab->srelgot == NULL
659 || ! bfd_set_section_flags (dynobj, htab->srelgot,
660 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
661 | SEC_IN_MEMORY | SEC_LINKER_CREATED
662 | SEC_READONLY))
663 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
664 return FALSE;
665 return TRUE;
666 }
667
668 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
669 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
670 hash table. */
671
672 static bfd_boolean
673 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
674 {
675 struct elf_i386_link_hash_table *htab;
676
677 htab = elf_i386_hash_table (info);
678 if (!htab->sgot && !create_got_section (dynobj, info))
679 return FALSE;
680
681 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
682 return FALSE;
683
684 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
685 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
686 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
687 if (!info->shared)
688 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
689
690 if (!htab->splt || !htab->srelplt || !htab->sdynbss
691 || (!info->shared && !htab->srelbss))
692 abort ();
693
694 return TRUE;
695 }
696
697 /* Copy the extra info we tack onto an elf_link_hash_entry. */
698
699 static void
700 elf_i386_copy_indirect_symbol (const struct elf_backend_data *bed,
701 struct elf_link_hash_entry *dir,
702 struct elf_link_hash_entry *ind)
703 {
704 struct elf_i386_link_hash_entry *edir, *eind;
705
706 edir = (struct elf_i386_link_hash_entry *) dir;
707 eind = (struct elf_i386_link_hash_entry *) ind;
708
709 if (eind->dyn_relocs != NULL)
710 {
711 if (edir->dyn_relocs != NULL)
712 {
713 struct elf_i386_dyn_relocs **pp;
714 struct elf_i386_dyn_relocs *p;
715
716 if (ind->root.type == bfd_link_hash_indirect)
717 abort ();
718
719 /* Add reloc counts against the weak sym to the strong sym
720 list. Merge any entries against the same section. */
721 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
722 {
723 struct elf_i386_dyn_relocs *q;
724
725 for (q = edir->dyn_relocs; q != NULL; q = q->next)
726 if (q->sec == p->sec)
727 {
728 q->pc_count += p->pc_count;
729 q->count += p->count;
730 *pp = p->next;
731 break;
732 }
733 if (q == NULL)
734 pp = &p->next;
735 }
736 *pp = edir->dyn_relocs;
737 }
738
739 edir->dyn_relocs = eind->dyn_relocs;
740 eind->dyn_relocs = NULL;
741 }
742
743 if (ind->root.type == bfd_link_hash_indirect
744 && dir->got.refcount <= 0)
745 {
746 edir->tls_type = eind->tls_type;
747 eind->tls_type = GOT_UNKNOWN;
748 }
749
750 if (ELIMINATE_COPY_RELOCS
751 && ind->root.type != bfd_link_hash_indirect
752 && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
753 /* If called to transfer flags for a weakdef during processing
754 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
755 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
756 dir->elf_link_hash_flags |=
757 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC
758 | ELF_LINK_HASH_REF_REGULAR
759 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
760 | ELF_LINK_HASH_NEEDS_PLT
761 | ELF_LINK_POINTER_EQUALITY_NEEDED));
762 else
763 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
764 }
765
766 static int
767 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
768 {
769 if (info->shared)
770 return r_type;
771
772 switch (r_type)
773 {
774 case R_386_TLS_GD:
775 case R_386_TLS_IE_32:
776 if (is_local)
777 return R_386_TLS_LE_32;
778 return R_386_TLS_IE_32;
779 case R_386_TLS_IE:
780 case R_386_TLS_GOTIE:
781 if (is_local)
782 return R_386_TLS_LE_32;
783 return r_type;
784 case R_386_TLS_LDM:
785 return R_386_TLS_LE_32;
786 }
787
788 return r_type;
789 }
790
791 /* Look through the relocs for a section during the first phase, and
792 calculate needed space in the global offset table, procedure linkage
793 table, and dynamic reloc sections. */
794
795 static bfd_boolean
796 elf_i386_check_relocs (bfd *abfd,
797 struct bfd_link_info *info,
798 asection *sec,
799 const Elf_Internal_Rela *relocs)
800 {
801 struct elf_i386_link_hash_table *htab;
802 Elf_Internal_Shdr *symtab_hdr;
803 struct elf_link_hash_entry **sym_hashes;
804 const Elf_Internal_Rela *rel;
805 const Elf_Internal_Rela *rel_end;
806 asection *sreloc;
807
808 if (info->relocatable)
809 return TRUE;
810
811 htab = elf_i386_hash_table (info);
812 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
813 sym_hashes = elf_sym_hashes (abfd);
814
815 sreloc = NULL;
816
817 rel_end = relocs + sec->reloc_count;
818 for (rel = relocs; rel < rel_end; rel++)
819 {
820 unsigned int r_type;
821 unsigned long r_symndx;
822 struct elf_link_hash_entry *h;
823
824 r_symndx = ELF32_R_SYM (rel->r_info);
825 r_type = ELF32_R_TYPE (rel->r_info);
826
827 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
828 {
829 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
830 bfd_archive_filename (abfd),
831 r_symndx);
832 return FALSE;
833 }
834
835 if (r_symndx < symtab_hdr->sh_info)
836 h = NULL;
837 else
838 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
839
840 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
841
842 switch (r_type)
843 {
844 case R_386_TLS_LDM:
845 htab->tls_ldm_got.refcount += 1;
846 goto create_got;
847
848 case R_386_PLT32:
849 /* This symbol requires a procedure linkage table entry. We
850 actually build the entry in adjust_dynamic_symbol,
851 because this might be a case of linking PIC code which is
852 never referenced by a dynamic object, in which case we
853 don't need to generate a procedure linkage table entry
854 after all. */
855
856 /* If this is a local symbol, we resolve it directly without
857 creating a procedure linkage table entry. */
858 if (h == NULL)
859 continue;
860
861 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
862 h->plt.refcount += 1;
863 break;
864
865 case R_386_TLS_IE_32:
866 case R_386_TLS_IE:
867 case R_386_TLS_GOTIE:
868 if (info->shared)
869 info->flags |= DF_STATIC_TLS;
870 /* Fall through */
871
872 case R_386_GOT32:
873 case R_386_TLS_GD:
874 /* This symbol requires a global offset table entry. */
875 {
876 int tls_type, old_tls_type;
877
878 switch (r_type)
879 {
880 default:
881 case R_386_GOT32: tls_type = GOT_NORMAL; break;
882 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
883 case R_386_TLS_IE_32:
884 if (ELF32_R_TYPE (rel->r_info) == r_type)
885 tls_type = GOT_TLS_IE_NEG;
886 else
887 /* If this is a GD->IE transition, we may use either of
888 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
889 tls_type = GOT_TLS_IE;
890 break;
891 case R_386_TLS_IE:
892 case R_386_TLS_GOTIE:
893 tls_type = GOT_TLS_IE_POS; break;
894 }
895
896 if (h != NULL)
897 {
898 h->got.refcount += 1;
899 old_tls_type = elf_i386_hash_entry(h)->tls_type;
900 }
901 else
902 {
903 bfd_signed_vma *local_got_refcounts;
904
905 /* This is a global offset table entry for a local symbol. */
906 local_got_refcounts = elf_local_got_refcounts (abfd);
907 if (local_got_refcounts == NULL)
908 {
909 bfd_size_type size;
910
911 size = symtab_hdr->sh_info;
912 size *= (sizeof (bfd_signed_vma) + sizeof(char));
913 local_got_refcounts = bfd_zalloc (abfd, size);
914 if (local_got_refcounts == NULL)
915 return FALSE;
916 elf_local_got_refcounts (abfd) = local_got_refcounts;
917 elf_i386_local_got_tls_type (abfd)
918 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
919 }
920 local_got_refcounts[r_symndx] += 1;
921 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
922 }
923
924 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
925 tls_type |= old_tls_type;
926 /* If a TLS symbol is accessed using IE at least once,
927 there is no point to use dynamic model for it. */
928 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
929 && (old_tls_type != GOT_TLS_GD
930 || (tls_type & GOT_TLS_IE) == 0))
931 {
932 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
933 tls_type = old_tls_type;
934 else
935 {
936 (*_bfd_error_handler)
937 (_("%s: `%s' accessed both as normal and "
938 "thread local symbol"),
939 bfd_archive_filename (abfd),
940 h ? h->root.root.string : "<local>");
941 return FALSE;
942 }
943 }
944
945 if (old_tls_type != tls_type)
946 {
947 if (h != NULL)
948 elf_i386_hash_entry (h)->tls_type = tls_type;
949 else
950 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
951 }
952 }
953 /* Fall through */
954
955 case R_386_GOTOFF:
956 case R_386_GOTPC:
957 create_got:
958 if (htab->sgot == NULL)
959 {
960 if (htab->elf.dynobj == NULL)
961 htab->elf.dynobj = abfd;
962 if (!create_got_section (htab->elf.dynobj, info))
963 return FALSE;
964 }
965 if (r_type != R_386_TLS_IE)
966 break;
967 /* Fall through */
968
969 case R_386_TLS_LE_32:
970 case R_386_TLS_LE:
971 if (!info->shared)
972 break;
973 info->flags |= DF_STATIC_TLS;
974 /* Fall through */
975
976 case R_386_32:
977 case R_386_PC32:
978 if (h != NULL && !info->shared)
979 {
980 /* If this reloc is in a read-only section, we might
981 need a copy reloc. We can't check reliably at this
982 stage whether the section is read-only, as input
983 sections have not yet been mapped to output sections.
984 Tentatively set the flag for now, and correct in
985 adjust_dynamic_symbol. */
986 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
987
988 /* We may need a .plt entry if the function this reloc
989 refers to is in a shared lib. */
990 h->plt.refcount += 1;
991 if (r_type != R_386_PC32)
992 h->elf_link_hash_flags |= ELF_LINK_POINTER_EQUALITY_NEEDED;
993 }
994
995 /* If we are creating a shared library, and this is a reloc
996 against a global symbol, or a non PC relative reloc
997 against a local symbol, then we need to copy the reloc
998 into the shared library. However, if we are linking with
999 -Bsymbolic, we do not need to copy a reloc against a
1000 global symbol which is defined in an object we are
1001 including in the link (i.e., DEF_REGULAR is set). At
1002 this point we have not seen all the input files, so it is
1003 possible that DEF_REGULAR is not set now but will be set
1004 later (it is never cleared). In case of a weak definition,
1005 DEF_REGULAR may be cleared later by a strong definition in
1006 a shared library. We account for that possibility below by
1007 storing information in the relocs_copied field of the hash
1008 table entry. A similar situation occurs when creating
1009 shared libraries and symbol visibility changes render the
1010 symbol local.
1011
1012 If on the other hand, we are creating an executable, we
1013 may need to keep relocations for symbols satisfied by a
1014 dynamic library if we manage to avoid copy relocs for the
1015 symbol. */
1016 if ((info->shared
1017 && (sec->flags & SEC_ALLOC) != 0
1018 && (r_type != R_386_PC32
1019 || (h != NULL
1020 && (! info->symbolic
1021 || h->root.type == bfd_link_hash_defweak
1022 || (h->elf_link_hash_flags
1023 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1024 || (ELIMINATE_COPY_RELOCS
1025 && !info->shared
1026 && (sec->flags & SEC_ALLOC) != 0
1027 && h != NULL
1028 && (h->root.type == bfd_link_hash_defweak
1029 || (h->elf_link_hash_flags
1030 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1031 {
1032 struct elf_i386_dyn_relocs *p;
1033 struct elf_i386_dyn_relocs **head;
1034
1035 /* We must copy these reloc types into the output file.
1036 Create a reloc section in dynobj and make room for
1037 this reloc. */
1038 if (sreloc == NULL)
1039 {
1040 const char *name;
1041 bfd *dynobj;
1042 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1043 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1044
1045 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1046 if (name == NULL)
1047 return FALSE;
1048
1049 if (strncmp (name, ".rel", 4) != 0
1050 || strcmp (bfd_get_section_name (abfd, sec),
1051 name + 4) != 0)
1052 {
1053 (*_bfd_error_handler)
1054 (_("%s: bad relocation section name `%s\'"),
1055 bfd_archive_filename (abfd), name);
1056 }
1057
1058 if (htab->elf.dynobj == NULL)
1059 htab->elf.dynobj = abfd;
1060
1061 dynobj = htab->elf.dynobj;
1062 sreloc = bfd_get_section_by_name (dynobj, name);
1063 if (sreloc == NULL)
1064 {
1065 flagword flags;
1066
1067 sreloc = bfd_make_section (dynobj, name);
1068 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1069 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1070 if ((sec->flags & SEC_ALLOC) != 0)
1071 flags |= SEC_ALLOC | SEC_LOAD;
1072 if (sreloc == NULL
1073 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1074 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1075 return FALSE;
1076 }
1077 elf_section_data (sec)->sreloc = sreloc;
1078 }
1079
1080 /* If this is a global symbol, we count the number of
1081 relocations we need for this symbol. */
1082 if (h != NULL)
1083 {
1084 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1085 }
1086 else
1087 {
1088 /* Track dynamic relocs needed for local syms too.
1089 We really need local syms available to do this
1090 easily. Oh well. */
1091
1092 asection *s;
1093 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1094 sec, r_symndx);
1095 if (s == NULL)
1096 return FALSE;
1097
1098 head = ((struct elf_i386_dyn_relocs **)
1099 &elf_section_data (s)->local_dynrel);
1100 }
1101
1102 p = *head;
1103 if (p == NULL || p->sec != sec)
1104 {
1105 bfd_size_type amt = sizeof *p;
1106 p = bfd_alloc (htab->elf.dynobj, amt);
1107 if (p == NULL)
1108 return FALSE;
1109 p->next = *head;
1110 *head = p;
1111 p->sec = sec;
1112 p->count = 0;
1113 p->pc_count = 0;
1114 }
1115
1116 p->count += 1;
1117 if (r_type == R_386_PC32)
1118 p->pc_count += 1;
1119 }
1120 break;
1121
1122 /* This relocation describes the C++ object vtable hierarchy.
1123 Reconstruct it for later use during GC. */
1124 case R_386_GNU_VTINHERIT:
1125 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1126 return FALSE;
1127 break;
1128
1129 /* This relocation describes which C++ vtable entries are actually
1130 used. Record for later use during GC. */
1131 case R_386_GNU_VTENTRY:
1132 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1133 return FALSE;
1134 break;
1135
1136 default:
1137 break;
1138 }
1139 }
1140
1141 return TRUE;
1142 }
1143
1144 /* Return the section that should be marked against GC for a given
1145 relocation. */
1146
1147 static asection *
1148 elf_i386_gc_mark_hook (asection *sec,
1149 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1150 Elf_Internal_Rela *rel,
1151 struct elf_link_hash_entry *h,
1152 Elf_Internal_Sym *sym)
1153 {
1154 if (h != NULL)
1155 {
1156 switch (ELF32_R_TYPE (rel->r_info))
1157 {
1158 case R_386_GNU_VTINHERIT:
1159 case R_386_GNU_VTENTRY:
1160 break;
1161
1162 default:
1163 switch (h->root.type)
1164 {
1165 case bfd_link_hash_defined:
1166 case bfd_link_hash_defweak:
1167 return h->root.u.def.section;
1168
1169 case bfd_link_hash_common:
1170 return h->root.u.c.p->section;
1171
1172 default:
1173 break;
1174 }
1175 }
1176 }
1177 else
1178 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1179
1180 return NULL;
1181 }
1182
1183 /* Update the got entry reference counts for the section being removed. */
1184
1185 static bfd_boolean
1186 elf_i386_gc_sweep_hook (bfd *abfd,
1187 struct bfd_link_info *info,
1188 asection *sec,
1189 const Elf_Internal_Rela *relocs)
1190 {
1191 Elf_Internal_Shdr *symtab_hdr;
1192 struct elf_link_hash_entry **sym_hashes;
1193 bfd_signed_vma *local_got_refcounts;
1194 const Elf_Internal_Rela *rel, *relend;
1195
1196 elf_section_data (sec)->local_dynrel = NULL;
1197
1198 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1199 sym_hashes = elf_sym_hashes (abfd);
1200 local_got_refcounts = elf_local_got_refcounts (abfd);
1201
1202 relend = relocs + sec->reloc_count;
1203 for (rel = relocs; rel < relend; rel++)
1204 {
1205 unsigned long r_symndx;
1206 unsigned int r_type;
1207 struct elf_link_hash_entry *h = NULL;
1208
1209 r_symndx = ELF32_R_SYM (rel->r_info);
1210 if (r_symndx >= symtab_hdr->sh_info)
1211 {
1212 struct elf_i386_link_hash_entry *eh;
1213 struct elf_i386_dyn_relocs **pp;
1214 struct elf_i386_dyn_relocs *p;
1215
1216 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1217 eh = (struct elf_i386_link_hash_entry *) h;
1218
1219 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1220 if (p->sec == sec)
1221 {
1222 /* Everything must go for SEC. */
1223 *pp = p->next;
1224 break;
1225 }
1226 }
1227
1228 r_type = ELF32_R_TYPE (rel->r_info);
1229 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1230 switch (r_type)
1231 {
1232 case R_386_TLS_LDM:
1233 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1234 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1235 break;
1236
1237 case R_386_TLS_GD:
1238 case R_386_TLS_IE_32:
1239 case R_386_TLS_IE:
1240 case R_386_TLS_GOTIE:
1241 case R_386_GOT32:
1242 if (h != NULL)
1243 {
1244 if (h->got.refcount > 0)
1245 h->got.refcount -= 1;
1246 }
1247 else if (local_got_refcounts != NULL)
1248 {
1249 if (local_got_refcounts[r_symndx] > 0)
1250 local_got_refcounts[r_symndx] -= 1;
1251 }
1252 break;
1253
1254 case R_386_32:
1255 case R_386_PC32:
1256 if (info->shared)
1257 break;
1258 /* Fall through */
1259
1260 case R_386_PLT32:
1261 if (h != NULL)
1262 {
1263 if (h->plt.refcount > 0)
1264 h->plt.refcount -= 1;
1265 }
1266 break;
1267
1268 default:
1269 break;
1270 }
1271 }
1272
1273 return TRUE;
1274 }
1275
1276 /* Adjust a symbol defined by a dynamic object and referenced by a
1277 regular object. The current definition is in some section of the
1278 dynamic object, but we're not including those sections. We have to
1279 change the definition to something the rest of the link can
1280 understand. */
1281
1282 static bfd_boolean
1283 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1284 struct elf_link_hash_entry *h)
1285 {
1286 struct elf_i386_link_hash_table *htab;
1287 asection *s;
1288 unsigned int power_of_two;
1289
1290 /* If this is a function, put it in the procedure linkage table. We
1291 will fill in the contents of the procedure linkage table later,
1292 when we know the address of the .got section. */
1293 if (h->type == STT_FUNC
1294 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1295 {
1296 if (h->plt.refcount <= 0
1297 || SYMBOL_CALLS_LOCAL (info, h)
1298 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1299 && h->root.type == bfd_link_hash_undefweak))
1300 {
1301 /* This case can occur if we saw a PLT32 reloc in an input
1302 file, but the symbol was never referred to by a dynamic
1303 object, or if all references were garbage collected. In
1304 such a case, we don't actually need to build a procedure
1305 linkage table, and we can just do a PC32 reloc instead. */
1306 h->plt.offset = (bfd_vma) -1;
1307 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1308 }
1309
1310 return TRUE;
1311 }
1312 else
1313 /* It's possible that we incorrectly decided a .plt reloc was
1314 needed for an R_386_PC32 reloc to a non-function sym in
1315 check_relocs. We can't decide accurately between function and
1316 non-function syms in check-relocs; Objects loaded later in
1317 the link may change h->type. So fix it now. */
1318 h->plt.offset = (bfd_vma) -1;
1319
1320 /* If this is a weak symbol, and there is a real definition, the
1321 processor independent code will have arranged for us to see the
1322 real definition first, and we can just use the same value. */
1323 if (h->weakdef != NULL)
1324 {
1325 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1326 || h->weakdef->root.type == bfd_link_hash_defweak);
1327 h->root.u.def.section = h->weakdef->root.u.def.section;
1328 h->root.u.def.value = h->weakdef->root.u.def.value;
1329 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1330 h->elf_link_hash_flags
1331 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF)
1332 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF));
1333 return TRUE;
1334 }
1335
1336 /* This is a reference to a symbol defined by a dynamic object which
1337 is not a function. */
1338
1339 /* If we are creating a shared library, we must presume that the
1340 only references to the symbol are via the global offset table.
1341 For such cases we need not do anything here; the relocations will
1342 be handled correctly by relocate_section. */
1343 if (info->shared)
1344 return TRUE;
1345
1346 /* If there are no references to this symbol that do not use the
1347 GOT, we don't need to generate a copy reloc. */
1348 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1349 return TRUE;
1350
1351 /* If -z nocopyreloc was given, we won't generate them either. */
1352 if (info->nocopyreloc)
1353 {
1354 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1355 return TRUE;
1356 }
1357
1358 if (ELIMINATE_COPY_RELOCS)
1359 {
1360 struct elf_i386_link_hash_entry * eh;
1361 struct elf_i386_dyn_relocs *p;
1362
1363 eh = (struct elf_i386_link_hash_entry *) h;
1364 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1365 {
1366 s = p->sec->output_section;
1367 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1368 break;
1369 }
1370
1371 /* If we didn't find any dynamic relocs in read-only sections, then
1372 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1373 if (p == NULL)
1374 {
1375 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1376 return TRUE;
1377 }
1378 }
1379
1380 /* We must allocate the symbol in our .dynbss section, which will
1381 become part of the .bss section of the executable. There will be
1382 an entry for this symbol in the .dynsym section. The dynamic
1383 object will contain position independent code, so all references
1384 from the dynamic object to this symbol will go through the global
1385 offset table. The dynamic linker will use the .dynsym entry to
1386 determine the address it must put in the global offset table, so
1387 both the dynamic object and the regular object will refer to the
1388 same memory location for the variable. */
1389
1390 htab = elf_i386_hash_table (info);
1391
1392 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1393 copy the initial value out of the dynamic object and into the
1394 runtime process image. */
1395 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1396 {
1397 htab->srelbss->_raw_size += sizeof (Elf32_External_Rel);
1398 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1399 }
1400
1401 /* We need to figure out the alignment required for this symbol. I
1402 have no idea how ELF linkers handle this. */
1403 power_of_two = bfd_log2 (h->size);
1404 if (power_of_two > 3)
1405 power_of_two = 3;
1406
1407 /* Apply the required alignment. */
1408 s = htab->sdynbss;
1409 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1410 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1411 {
1412 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1413 return FALSE;
1414 }
1415
1416 /* Define the symbol as being at this point in the section. */
1417 h->root.u.def.section = s;
1418 h->root.u.def.value = s->_raw_size;
1419
1420 /* Increment the section size to make room for the symbol. */
1421 s->_raw_size += h->size;
1422
1423 return TRUE;
1424 }
1425
1426 /* This is the condition under which elf_i386_finish_dynamic_symbol
1427 will be called from elflink.h. If elflink.h doesn't call our
1428 finish_dynamic_symbol routine, we'll need to do something about
1429 initializing any .plt and .got entries in elf_i386_relocate_section. */
1430 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1431 ((DYN) \
1432 && ((SHARED) \
1433 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1434 && ((H)->dynindx != -1 \
1435 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1436
1437 /* Allocate space in .plt, .got and associated reloc sections for
1438 dynamic relocs. */
1439
1440 static bfd_boolean
1441 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1442 {
1443 struct bfd_link_info *info;
1444 struct elf_i386_link_hash_table *htab;
1445 struct elf_i386_link_hash_entry *eh;
1446 struct elf_i386_dyn_relocs *p;
1447
1448 if (h->root.type == bfd_link_hash_indirect)
1449 return TRUE;
1450
1451 if (h->root.type == bfd_link_hash_warning)
1452 /* When warning symbols are created, they **replace** the "real"
1453 entry in the hash table, thus we never get to see the real
1454 symbol in a hash traversal. So look at it now. */
1455 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1456
1457 info = (struct bfd_link_info *) inf;
1458 htab = elf_i386_hash_table (info);
1459
1460 if (htab->elf.dynamic_sections_created
1461 && h->plt.refcount > 0)
1462 {
1463 /* Make sure this symbol is output as a dynamic symbol.
1464 Undefined weak syms won't yet be marked as dynamic. */
1465 if (h->dynindx == -1
1466 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1467 {
1468 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1469 return FALSE;
1470 }
1471
1472 if (info->shared
1473 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1474 {
1475 asection *s = htab->splt;
1476
1477 /* If this is the first .plt entry, make room for the special
1478 first entry. */
1479 if (s->_raw_size == 0)
1480 s->_raw_size += PLT_ENTRY_SIZE;
1481
1482 h->plt.offset = s->_raw_size;
1483
1484 /* If this symbol is not defined in a regular file, and we are
1485 not generating a shared library, then set the symbol to this
1486 location in the .plt. This is required to make function
1487 pointers compare as equal between the normal executable and
1488 the shared library. */
1489 if (! info->shared
1490 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1491 {
1492 h->root.u.def.section = s;
1493 h->root.u.def.value = h->plt.offset;
1494 }
1495
1496 /* Make room for this entry. */
1497 s->_raw_size += PLT_ENTRY_SIZE;
1498
1499 /* We also need to make an entry in the .got.plt section, which
1500 will be placed in the .got section by the linker script. */
1501 htab->sgotplt->_raw_size += 4;
1502
1503 /* We also need to make an entry in the .rel.plt section. */
1504 htab->srelplt->_raw_size += sizeof (Elf32_External_Rel);
1505 }
1506 else
1507 {
1508 h->plt.offset = (bfd_vma) -1;
1509 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1510 }
1511 }
1512 else
1513 {
1514 h->plt.offset = (bfd_vma) -1;
1515 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1516 }
1517
1518 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1519 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1520 if (h->got.refcount > 0
1521 && !info->shared
1522 && h->dynindx == -1
1523 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1524 h->got.offset = (bfd_vma) -1;
1525 else if (h->got.refcount > 0)
1526 {
1527 asection *s;
1528 bfd_boolean dyn;
1529 int tls_type = elf_i386_hash_entry(h)->tls_type;
1530
1531 /* Make sure this symbol is output as a dynamic symbol.
1532 Undefined weak syms won't yet be marked as dynamic. */
1533 if (h->dynindx == -1
1534 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1535 {
1536 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1537 return FALSE;
1538 }
1539
1540 s = htab->sgot;
1541 h->got.offset = s->_raw_size;
1542 s->_raw_size += 4;
1543 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1544 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1545 s->_raw_size += 4;
1546 dyn = htab->elf.dynamic_sections_created;
1547 /* R_386_TLS_IE_32 needs one dynamic relocation,
1548 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1549 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1550 need two), R_386_TLS_GD needs one if local symbol and two if
1551 global. */
1552 if (tls_type == GOT_TLS_IE_BOTH)
1553 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1554 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1555 || (tls_type & GOT_TLS_IE))
1556 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1557 else if (tls_type == GOT_TLS_GD)
1558 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1559 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1560 || h->root.type != bfd_link_hash_undefweak)
1561 && (info->shared
1562 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1563 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1564 }
1565 else
1566 h->got.offset = (bfd_vma) -1;
1567
1568 eh = (struct elf_i386_link_hash_entry *) h;
1569 if (eh->dyn_relocs == NULL)
1570 return TRUE;
1571
1572 /* In the shared -Bsymbolic case, discard space allocated for
1573 dynamic pc-relative relocs against symbols which turn out to be
1574 defined in regular objects. For the normal shared case, discard
1575 space for pc-relative relocs that have become local due to symbol
1576 visibility changes. */
1577
1578 if (info->shared)
1579 {
1580 /* The only reloc that uses pc_count is R_386_PC32, which will
1581 appear on a call or on something like ".long foo - .". We
1582 want calls to protected symbols to resolve directly to the
1583 function rather than going via the plt. If people want
1584 function pointer comparisons to work as expected then they
1585 should avoid writing assembly like ".long foo - .". */
1586 if (SYMBOL_CALLS_LOCAL (info, h))
1587 {
1588 struct elf_i386_dyn_relocs **pp;
1589
1590 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1591 {
1592 p->count -= p->pc_count;
1593 p->pc_count = 0;
1594 if (p->count == 0)
1595 *pp = p->next;
1596 else
1597 pp = &p->next;
1598 }
1599 }
1600
1601 /* Also discard relocs on undefined weak syms with non-default
1602 visibility. */
1603 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1604 && h->root.type == bfd_link_hash_undefweak)
1605 eh->dyn_relocs = NULL;
1606 }
1607 else if (ELIMINATE_COPY_RELOCS)
1608 {
1609 /* For the non-shared case, discard space for relocs against
1610 symbols which turn out to need copy relocs or are not
1611 dynamic. */
1612
1613 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1614 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1615 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1616 || (htab->elf.dynamic_sections_created
1617 && (h->root.type == bfd_link_hash_undefweak
1618 || h->root.type == bfd_link_hash_undefined))))
1619 {
1620 /* Make sure this symbol is output as a dynamic symbol.
1621 Undefined weak syms won't yet be marked as dynamic. */
1622 if (h->dynindx == -1
1623 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1624 {
1625 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1626 return FALSE;
1627 }
1628
1629 /* If that succeeded, we know we'll be keeping all the
1630 relocs. */
1631 if (h->dynindx != -1)
1632 goto keep;
1633 }
1634
1635 eh->dyn_relocs = NULL;
1636
1637 keep: ;
1638 }
1639
1640 /* Finally, allocate space. */
1641 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1642 {
1643 asection *sreloc = elf_section_data (p->sec)->sreloc;
1644 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel);
1645 }
1646
1647 return TRUE;
1648 }
1649
1650 /* Find any dynamic relocs that apply to read-only sections. */
1651
1652 static bfd_boolean
1653 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1654 {
1655 struct elf_i386_link_hash_entry *eh;
1656 struct elf_i386_dyn_relocs *p;
1657
1658 if (h->root.type == bfd_link_hash_warning)
1659 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1660
1661 eh = (struct elf_i386_link_hash_entry *) h;
1662 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1663 {
1664 asection *s = p->sec->output_section;
1665
1666 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1667 {
1668 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1669
1670 info->flags |= DF_TEXTREL;
1671
1672 /* Not an error, just cut short the traversal. */
1673 return FALSE;
1674 }
1675 }
1676 return TRUE;
1677 }
1678
1679 /* Set the sizes of the dynamic sections. */
1680
1681 static bfd_boolean
1682 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1683 struct bfd_link_info *info)
1684 {
1685 struct elf_i386_link_hash_table *htab;
1686 bfd *dynobj;
1687 asection *s;
1688 bfd_boolean relocs;
1689 bfd *ibfd;
1690
1691 htab = elf_i386_hash_table (info);
1692 dynobj = htab->elf.dynobj;
1693 if (dynobj == NULL)
1694 abort ();
1695
1696 if (htab->elf.dynamic_sections_created)
1697 {
1698 /* Set the contents of the .interp section to the interpreter. */
1699 if (info->executable)
1700 {
1701 s = bfd_get_section_by_name (dynobj, ".interp");
1702 if (s == NULL)
1703 abort ();
1704 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1705 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1706 }
1707 }
1708
1709 /* Set up .got offsets for local syms, and space for local dynamic
1710 relocs. */
1711 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1712 {
1713 bfd_signed_vma *local_got;
1714 bfd_signed_vma *end_local_got;
1715 char *local_tls_type;
1716 bfd_size_type locsymcount;
1717 Elf_Internal_Shdr *symtab_hdr;
1718 asection *srel;
1719
1720 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1721 continue;
1722
1723 for (s = ibfd->sections; s != NULL; s = s->next)
1724 {
1725 struct elf_i386_dyn_relocs *p;
1726
1727 for (p = *((struct elf_i386_dyn_relocs **)
1728 &elf_section_data (s)->local_dynrel);
1729 p != NULL;
1730 p = p->next)
1731 {
1732 if (!bfd_is_abs_section (p->sec)
1733 && bfd_is_abs_section (p->sec->output_section))
1734 {
1735 /* Input section has been discarded, either because
1736 it is a copy of a linkonce section or due to
1737 linker script /DISCARD/, so we'll be discarding
1738 the relocs too. */
1739 }
1740 else if (p->count != 0)
1741 {
1742 srel = elf_section_data (p->sec)->sreloc;
1743 srel->_raw_size += p->count * sizeof (Elf32_External_Rel);
1744 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1745 info->flags |= DF_TEXTREL;
1746 }
1747 }
1748 }
1749
1750 local_got = elf_local_got_refcounts (ibfd);
1751 if (!local_got)
1752 continue;
1753
1754 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1755 locsymcount = symtab_hdr->sh_info;
1756 end_local_got = local_got + locsymcount;
1757 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1758 s = htab->sgot;
1759 srel = htab->srelgot;
1760 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1761 {
1762 if (*local_got > 0)
1763 {
1764 *local_got = s->_raw_size;
1765 s->_raw_size += 4;
1766 if (*local_tls_type == GOT_TLS_GD
1767 || *local_tls_type == GOT_TLS_IE_BOTH)
1768 s->_raw_size += 4;
1769 if (info->shared
1770 || *local_tls_type == GOT_TLS_GD
1771 || (*local_tls_type & GOT_TLS_IE))
1772 {
1773 if (*local_tls_type == GOT_TLS_IE_BOTH)
1774 srel->_raw_size += 2 * sizeof (Elf32_External_Rel);
1775 else
1776 srel->_raw_size += sizeof (Elf32_External_Rel);
1777 }
1778 }
1779 else
1780 *local_got = (bfd_vma) -1;
1781 }
1782 }
1783
1784 if (htab->tls_ldm_got.refcount > 0)
1785 {
1786 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1787 relocs. */
1788 htab->tls_ldm_got.offset = htab->sgot->_raw_size;
1789 htab->sgot->_raw_size += 8;
1790 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1791 }
1792 else
1793 htab->tls_ldm_got.offset = -1;
1794
1795 /* Allocate global sym .plt and .got entries, and space for global
1796 sym dynamic relocs. */
1797 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1798
1799 /* We now have determined the sizes of the various dynamic sections.
1800 Allocate memory for them. */
1801 relocs = FALSE;
1802 for (s = dynobj->sections; s != NULL; s = s->next)
1803 {
1804 if ((s->flags & SEC_LINKER_CREATED) == 0)
1805 continue;
1806
1807 if (s == htab->splt
1808 || s == htab->sgot
1809 || s == htab->sgotplt)
1810 {
1811 /* Strip this section if we don't need it; see the
1812 comment below. */
1813 }
1814 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1815 {
1816 if (s->_raw_size != 0 && s != htab->srelplt)
1817 relocs = TRUE;
1818
1819 /* We use the reloc_count field as a counter if we need
1820 to copy relocs into the output file. */
1821 s->reloc_count = 0;
1822 }
1823 else
1824 {
1825 /* It's not one of our sections, so don't allocate space. */
1826 continue;
1827 }
1828
1829 if (s->_raw_size == 0)
1830 {
1831 /* If we don't need this section, strip it from the
1832 output file. This is mostly to handle .rel.bss and
1833 .rel.plt. We must create both sections in
1834 create_dynamic_sections, because they must be created
1835 before the linker maps input sections to output
1836 sections. The linker does that before
1837 adjust_dynamic_symbol is called, and it is that
1838 function which decides whether anything needs to go
1839 into these sections. */
1840
1841 _bfd_strip_section_from_output (info, s);
1842 continue;
1843 }
1844
1845 /* Allocate memory for the section contents. We use bfd_zalloc
1846 here in case unused entries are not reclaimed before the
1847 section's contents are written out. This should not happen,
1848 but this way if it does, we get a R_386_NONE reloc instead
1849 of garbage. */
1850 s->contents = bfd_zalloc (dynobj, s->_raw_size);
1851 if (s->contents == NULL)
1852 return FALSE;
1853 }
1854
1855 if (htab->elf.dynamic_sections_created)
1856 {
1857 /* Add some entries to the .dynamic section. We fill in the
1858 values later, in elf_i386_finish_dynamic_sections, but we
1859 must add the entries now so that we get the correct size for
1860 the .dynamic section. The DT_DEBUG entry is filled in by the
1861 dynamic linker and used by the debugger. */
1862 #define add_dynamic_entry(TAG, VAL) \
1863 bfd_elf32_add_dynamic_entry (info, (TAG), (VAL))
1864
1865 if (info->executable)
1866 {
1867 if (!add_dynamic_entry (DT_DEBUG, 0))
1868 return FALSE;
1869 }
1870
1871 if (htab->splt->_raw_size != 0)
1872 {
1873 if (!add_dynamic_entry (DT_PLTGOT, 0)
1874 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1875 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1876 || !add_dynamic_entry (DT_JMPREL, 0))
1877 return FALSE;
1878 }
1879
1880 if (relocs)
1881 {
1882 if (!add_dynamic_entry (DT_REL, 0)
1883 || !add_dynamic_entry (DT_RELSZ, 0)
1884 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
1885 return FALSE;
1886
1887 /* If any dynamic relocs apply to a read-only section,
1888 then we need a DT_TEXTREL entry. */
1889 if ((info->flags & DF_TEXTREL) == 0)
1890 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1891 (PTR) info);
1892
1893 if ((info->flags & DF_TEXTREL) != 0)
1894 {
1895 if (!add_dynamic_entry (DT_TEXTREL, 0))
1896 return FALSE;
1897 }
1898 }
1899 }
1900 #undef add_dynamic_entry
1901
1902 return TRUE;
1903 }
1904
1905 /* Set the correct type for an x86 ELF section. We do this by the
1906 section name, which is a hack, but ought to work. */
1907
1908 static bfd_boolean
1909 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1910 Elf_Internal_Shdr *hdr,
1911 asection *sec)
1912 {
1913 register const char *name;
1914
1915 name = bfd_get_section_name (abfd, sec);
1916
1917 /* This is an ugly, but unfortunately necessary hack that is
1918 needed when producing EFI binaries on x86. It tells
1919 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1920 containing ELF relocation info. We need this hack in order to
1921 be able to generate ELF binaries that can be translated into
1922 EFI applications (which are essentially COFF objects). Those
1923 files contain a COFF ".reloc" section inside an ELFNN object,
1924 which would normally cause BFD to segfault because it would
1925 attempt to interpret this section as containing relocation
1926 entries for section "oc". With this hack enabled, ".reloc"
1927 will be treated as a normal data section, which will avoid the
1928 segfault. However, you won't be able to create an ELFNN binary
1929 with a section named "oc" that needs relocations, but that's
1930 the kind of ugly side-effects you get when detecting section
1931 types based on their names... In practice, this limitation is
1932 unlikely to bite. */
1933 if (strcmp (name, ".reloc") == 0)
1934 hdr->sh_type = SHT_PROGBITS;
1935
1936 return TRUE;
1937 }
1938
1939 /* Return the base VMA address which should be subtracted from real addresses
1940 when resolving @dtpoff relocation.
1941 This is PT_TLS segment p_vaddr. */
1942
1943 static bfd_vma
1944 dtpoff_base (struct bfd_link_info *info)
1945 {
1946 /* If tls_sec is NULL, we should have signalled an error already. */
1947 if (elf_hash_table (info)->tls_sec == NULL)
1948 return 0;
1949 return elf_hash_table (info)->tls_sec->vma;
1950 }
1951
1952 /* Return the relocation value for @tpoff relocation
1953 if STT_TLS virtual address is ADDRESS. */
1954
1955 static bfd_vma
1956 tpoff (struct bfd_link_info *info, bfd_vma address)
1957 {
1958 struct elf_link_hash_table *htab = elf_hash_table (info);
1959
1960 /* If tls_sec is NULL, we should have signalled an error already. */
1961 if (htab->tls_sec == NULL)
1962 return 0;
1963 return htab->tls_size + htab->tls_sec->vma - address;
1964 }
1965
1966 /* Relocate an i386 ELF section. */
1967
1968 static bfd_boolean
1969 elf_i386_relocate_section (bfd *output_bfd,
1970 struct bfd_link_info *info,
1971 bfd *input_bfd,
1972 asection *input_section,
1973 bfd_byte *contents,
1974 Elf_Internal_Rela *relocs,
1975 Elf_Internal_Sym *local_syms,
1976 asection **local_sections)
1977 {
1978 struct elf_i386_link_hash_table *htab;
1979 Elf_Internal_Shdr *symtab_hdr;
1980 struct elf_link_hash_entry **sym_hashes;
1981 bfd_vma *local_got_offsets;
1982 Elf_Internal_Rela *rel;
1983 Elf_Internal_Rela *relend;
1984
1985 htab = elf_i386_hash_table (info);
1986 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
1987 sym_hashes = elf_sym_hashes (input_bfd);
1988 local_got_offsets = elf_local_got_offsets (input_bfd);
1989
1990 rel = relocs;
1991 relend = relocs + input_section->reloc_count;
1992 for (; rel < relend; rel++)
1993 {
1994 unsigned int r_type;
1995 reloc_howto_type *howto;
1996 unsigned long r_symndx;
1997 struct elf_link_hash_entry *h;
1998 Elf_Internal_Sym *sym;
1999 asection *sec;
2000 bfd_vma off;
2001 bfd_vma relocation;
2002 bfd_boolean unresolved_reloc;
2003 bfd_reloc_status_type r;
2004 unsigned int indx;
2005 int tls_type;
2006
2007 r_type = ELF32_R_TYPE (rel->r_info);
2008 if (r_type == R_386_GNU_VTINHERIT
2009 || r_type == R_386_GNU_VTENTRY)
2010 continue;
2011
2012 if ((indx = r_type) >= R_386_standard
2013 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2014 >= R_386_ext - R_386_standard)
2015 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2016 >= R_386_tls - R_386_ext))
2017 {
2018 bfd_set_error (bfd_error_bad_value);
2019 return FALSE;
2020 }
2021 howto = elf_howto_table + indx;
2022
2023 r_symndx = ELF32_R_SYM (rel->r_info);
2024
2025 if (info->relocatable)
2026 {
2027 bfd_vma val;
2028 bfd_byte *where;
2029
2030 /* This is a relocatable link. We don't have to change
2031 anything, unless the reloc is against a section symbol,
2032 in which case we have to adjust according to where the
2033 section symbol winds up in the output section. */
2034 if (r_symndx >= symtab_hdr->sh_info)
2035 continue;
2036
2037 sym = local_syms + r_symndx;
2038 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2039 continue;
2040
2041 sec = local_sections[r_symndx];
2042 val = sec->output_offset;
2043 if (val == 0)
2044 continue;
2045
2046 where = contents + rel->r_offset;
2047 switch (howto->size)
2048 {
2049 /* FIXME: overflow checks. */
2050 case 0:
2051 val += bfd_get_8 (input_bfd, where);
2052 bfd_put_8 (input_bfd, val, where);
2053 break;
2054 case 1:
2055 val += bfd_get_16 (input_bfd, where);
2056 bfd_put_16 (input_bfd, val, where);
2057 break;
2058 case 2:
2059 val += bfd_get_32 (input_bfd, where);
2060 bfd_put_32 (input_bfd, val, where);
2061 break;
2062 default:
2063 abort ();
2064 }
2065 continue;
2066 }
2067
2068 /* This is a final link. */
2069 h = NULL;
2070 sym = NULL;
2071 sec = NULL;
2072 unresolved_reloc = FALSE;
2073 if (r_symndx < symtab_hdr->sh_info)
2074 {
2075 sym = local_syms + r_symndx;
2076 sec = local_sections[r_symndx];
2077 relocation = (sec->output_section->vma
2078 + sec->output_offset
2079 + sym->st_value);
2080 if ((sec->flags & SEC_MERGE)
2081 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2082 {
2083 asection *msec;
2084 bfd_vma addend;
2085 bfd_byte *where = contents + rel->r_offset;
2086
2087 switch (howto->size)
2088 {
2089 case 0:
2090 addend = bfd_get_8 (input_bfd, where);
2091 if (howto->pc_relative)
2092 {
2093 addend = (addend ^ 0x80) - 0x80;
2094 addend += 1;
2095 }
2096 break;
2097 case 1:
2098 addend = bfd_get_16 (input_bfd, where);
2099 if (howto->pc_relative)
2100 {
2101 addend = (addend ^ 0x8000) - 0x8000;
2102 addend += 2;
2103 }
2104 break;
2105 case 2:
2106 addend = bfd_get_32 (input_bfd, where);
2107 if (howto->pc_relative)
2108 {
2109 addend = (addend ^ 0x80000000) - 0x80000000;
2110 addend += 4;
2111 }
2112 break;
2113 default:
2114 abort ();
2115 }
2116
2117 msec = sec;
2118 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2119 addend -= relocation;
2120 addend += msec->output_section->vma + msec->output_offset;
2121
2122 switch (howto->size)
2123 {
2124 case 0:
2125 /* FIXME: overflow checks. */
2126 if (howto->pc_relative)
2127 addend -= 1;
2128 bfd_put_8 (input_bfd, addend, where);
2129 break;
2130 case 1:
2131 if (howto->pc_relative)
2132 addend -= 2;
2133 bfd_put_16 (input_bfd, addend, where);
2134 break;
2135 case 2:
2136 if (howto->pc_relative)
2137 addend -= 4;
2138 bfd_put_32 (input_bfd, addend, where);
2139 break;
2140 }
2141 }
2142 }
2143 else
2144 {
2145 bfd_boolean warned;
2146
2147 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr, relocation, sec, unresolved_reloc, info, warned);
2148 }
2149
2150 switch (r_type)
2151 {
2152 case R_386_GOT32:
2153 /* Relocation is to the entry for this symbol in the global
2154 offset table. */
2155 if (htab->sgot == NULL)
2156 abort ();
2157
2158 if (h != NULL)
2159 {
2160 bfd_boolean dyn;
2161
2162 off = h->got.offset;
2163 dyn = htab->elf.dynamic_sections_created;
2164 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2165 || (info->shared
2166 && SYMBOL_REFERENCES_LOCAL (info, h))
2167 || (ELF_ST_VISIBILITY (h->other)
2168 && h->root.type == bfd_link_hash_undefweak))
2169 {
2170 /* This is actually a static link, or it is a
2171 -Bsymbolic link and the symbol is defined
2172 locally, or the symbol was forced to be local
2173 because of a version file. We must initialize
2174 this entry in the global offset table. Since the
2175 offset must always be a multiple of 4, we use the
2176 least significant bit to record whether we have
2177 initialized it already.
2178
2179 When doing a dynamic link, we create a .rel.got
2180 relocation entry to initialize the value. This
2181 is done in the finish_dynamic_symbol routine. */
2182 if ((off & 1) != 0)
2183 off &= ~1;
2184 else
2185 {
2186 bfd_put_32 (output_bfd, relocation,
2187 htab->sgot->contents + off);
2188 h->got.offset |= 1;
2189 }
2190 }
2191 else
2192 unresolved_reloc = FALSE;
2193 }
2194 else
2195 {
2196 if (local_got_offsets == NULL)
2197 abort ();
2198
2199 off = local_got_offsets[r_symndx];
2200
2201 /* The offset must always be a multiple of 4. We use
2202 the least significant bit to record whether we have
2203 already generated the necessary reloc. */
2204 if ((off & 1) != 0)
2205 off &= ~1;
2206 else
2207 {
2208 bfd_put_32 (output_bfd, relocation,
2209 htab->sgot->contents + off);
2210
2211 if (info->shared)
2212 {
2213 asection *s;
2214 Elf_Internal_Rela outrel;
2215 bfd_byte *loc;
2216
2217 s = htab->srelgot;
2218 if (s == NULL)
2219 abort ();
2220
2221 outrel.r_offset = (htab->sgot->output_section->vma
2222 + htab->sgot->output_offset
2223 + off);
2224 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2225 loc = s->contents;
2226 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2227 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2228 }
2229
2230 local_got_offsets[r_symndx] |= 1;
2231 }
2232 }
2233
2234 if (off >= (bfd_vma) -2)
2235 abort ();
2236
2237 relocation = htab->sgot->output_offset + off;
2238 break;
2239
2240 case R_386_GOTOFF:
2241 /* Relocation is relative to the start of the global offset
2242 table. */
2243
2244 /* Note that sgot->output_offset is not involved in this
2245 calculation. We always want the start of .got. If we
2246 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2247 permitted by the ABI, we might have to change this
2248 calculation. */
2249 relocation -= htab->sgot->output_section->vma;
2250 break;
2251
2252 case R_386_GOTPC:
2253 /* Use global offset table as symbol value. */
2254 relocation = htab->sgot->output_section->vma;
2255 unresolved_reloc = FALSE;
2256 break;
2257
2258 case R_386_PLT32:
2259 /* Relocation is to the entry for this symbol in the
2260 procedure linkage table. */
2261
2262 /* Resolve a PLT32 reloc against a local symbol directly,
2263 without using the procedure linkage table. */
2264 if (h == NULL)
2265 break;
2266
2267 if (h->plt.offset == (bfd_vma) -1
2268 || htab->splt == NULL)
2269 {
2270 /* We didn't make a PLT entry for this symbol. This
2271 happens when statically linking PIC code, or when
2272 using -Bsymbolic. */
2273 break;
2274 }
2275
2276 relocation = (htab->splt->output_section->vma
2277 + htab->splt->output_offset
2278 + h->plt.offset);
2279 unresolved_reloc = FALSE;
2280 break;
2281
2282 case R_386_32:
2283 case R_386_PC32:
2284 /* r_symndx will be zero only for relocs against symbols
2285 from removed linkonce sections, or sections discarded by
2286 a linker script. */
2287 if (r_symndx == 0
2288 || (input_section->flags & SEC_ALLOC) == 0)
2289 break;
2290
2291 if ((info->shared
2292 && (h == NULL
2293 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2294 || h->root.type != bfd_link_hash_undefweak)
2295 && (r_type != R_386_PC32
2296 || !SYMBOL_CALLS_LOCAL (info, h)))
2297 || (ELIMINATE_COPY_RELOCS
2298 && !info->shared
2299 && h != NULL
2300 && h->dynindx != -1
2301 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2302 && (((h->elf_link_hash_flags
2303 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2304 && (h->elf_link_hash_flags
2305 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2306 || h->root.type == bfd_link_hash_undefweak
2307 || h->root.type == bfd_link_hash_undefined)))
2308 {
2309 Elf_Internal_Rela outrel;
2310 bfd_byte *loc;
2311 bfd_boolean skip, relocate;
2312 asection *sreloc;
2313
2314 /* When generating a shared object, these relocations
2315 are copied into the output file to be resolved at run
2316 time. */
2317
2318 skip = FALSE;
2319 relocate = FALSE;
2320
2321 outrel.r_offset =
2322 _bfd_elf_section_offset (output_bfd, info, input_section,
2323 rel->r_offset);
2324 if (outrel.r_offset == (bfd_vma) -1)
2325 skip = TRUE;
2326 else if (outrel.r_offset == (bfd_vma) -2)
2327 skip = TRUE, relocate = TRUE;
2328 outrel.r_offset += (input_section->output_section->vma
2329 + input_section->output_offset);
2330
2331 if (skip)
2332 memset (&outrel, 0, sizeof outrel);
2333 else if (h != NULL
2334 && h->dynindx != -1
2335 && (r_type == R_386_PC32
2336 || !info->shared
2337 || !info->symbolic
2338 || (h->elf_link_hash_flags
2339 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2340 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2341 else
2342 {
2343 /* This symbol is local, or marked to become local. */
2344 relocate = TRUE;
2345 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2346 }
2347
2348 sreloc = elf_section_data (input_section)->sreloc;
2349 if (sreloc == NULL)
2350 abort ();
2351
2352 loc = sreloc->contents;
2353 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2354 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2355
2356 /* If this reloc is against an external symbol, we do
2357 not want to fiddle with the addend. Otherwise, we
2358 need to include the symbol value so that it becomes
2359 an addend for the dynamic reloc. */
2360 if (! relocate)
2361 continue;
2362 }
2363 break;
2364
2365 case R_386_TLS_IE:
2366 if (info->shared)
2367 {
2368 Elf_Internal_Rela outrel;
2369 bfd_byte *loc;
2370 asection *sreloc;
2371
2372 outrel.r_offset = rel->r_offset
2373 + input_section->output_section->vma
2374 + input_section->output_offset;
2375 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2376 sreloc = elf_section_data (input_section)->sreloc;
2377 if (sreloc == NULL)
2378 abort ();
2379 loc = sreloc->contents;
2380 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2381 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2382 }
2383 /* Fall through */
2384
2385 case R_386_TLS_GD:
2386 case R_386_TLS_IE_32:
2387 case R_386_TLS_GOTIE:
2388 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2389 tls_type = GOT_UNKNOWN;
2390 if (h == NULL && local_got_offsets)
2391 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2392 else if (h != NULL)
2393 {
2394 tls_type = elf_i386_hash_entry(h)->tls_type;
2395 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2396 r_type = R_386_TLS_LE_32;
2397 }
2398 if (tls_type == GOT_TLS_IE)
2399 tls_type = GOT_TLS_IE_NEG;
2400 if (r_type == R_386_TLS_GD)
2401 {
2402 if (tls_type == GOT_TLS_IE_POS)
2403 r_type = R_386_TLS_GOTIE;
2404 else if (tls_type & GOT_TLS_IE)
2405 r_type = R_386_TLS_IE_32;
2406 }
2407
2408 if (r_type == R_386_TLS_LE_32)
2409 {
2410 BFD_ASSERT (! unresolved_reloc);
2411 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2412 {
2413 unsigned int val, type;
2414 bfd_vma roff;
2415
2416 /* GD->LE transition. */
2417 BFD_ASSERT (rel->r_offset >= 2);
2418 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2419 BFD_ASSERT (type == 0x8d || type == 0x04);
2420 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2421 BFD_ASSERT (bfd_get_8 (input_bfd,
2422 contents + rel->r_offset + 4)
2423 == 0xe8);
2424 BFD_ASSERT (rel + 1 < relend);
2425 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2426 roff = rel->r_offset + 5;
2427 val = bfd_get_8 (input_bfd,
2428 contents + rel->r_offset - 1);
2429 if (type == 0x04)
2430 {
2431 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2432 Change it into:
2433 movl %gs:0, %eax; subl $foo@tpoff, %eax
2434 (6 byte form of subl). */
2435 BFD_ASSERT (rel->r_offset >= 3);
2436 BFD_ASSERT (bfd_get_8 (input_bfd,
2437 contents + rel->r_offset - 3)
2438 == 0x8d);
2439 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2440 memcpy (contents + rel->r_offset - 3,
2441 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2442 }
2443 else
2444 {
2445 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2446 if (rel->r_offset + 10 <= input_section->_raw_size
2447 && bfd_get_8 (input_bfd,
2448 contents + rel->r_offset + 9) == 0x90)
2449 {
2450 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2451 Change it into:
2452 movl %gs:0, %eax; subl $foo@tpoff, %eax
2453 (6 byte form of subl). */
2454 memcpy (contents + rel->r_offset - 2,
2455 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2456 roff = rel->r_offset + 6;
2457 }
2458 else
2459 {
2460 /* leal foo(%reg), %eax; call ___tls_get_addr
2461 Change it into:
2462 movl %gs:0, %eax; subl $foo@tpoff, %eax
2463 (5 byte form of subl). */
2464 memcpy (contents + rel->r_offset - 2,
2465 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2466 }
2467 }
2468 bfd_put_32 (output_bfd, tpoff (info, relocation),
2469 contents + roff);
2470 /* Skip R_386_PLT32. */
2471 rel++;
2472 continue;
2473 }
2474 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2475 {
2476 unsigned int val, type;
2477
2478 /* IE->LE transition:
2479 Originally it can be one of:
2480 movl foo, %eax
2481 movl foo, %reg
2482 addl foo, %reg
2483 We change it into:
2484 movl $foo, %eax
2485 movl $foo, %reg
2486 addl $foo, %reg. */
2487 BFD_ASSERT (rel->r_offset >= 1);
2488 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2489 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2490 if (val == 0xa1)
2491 {
2492 /* movl foo, %eax. */
2493 bfd_put_8 (output_bfd, 0xb8,
2494 contents + rel->r_offset - 1);
2495 }
2496 else
2497 {
2498 BFD_ASSERT (rel->r_offset >= 2);
2499 type = bfd_get_8 (input_bfd,
2500 contents + rel->r_offset - 2);
2501 switch (type)
2502 {
2503 case 0x8b:
2504 /* movl */
2505 BFD_ASSERT ((val & 0xc7) == 0x05);
2506 bfd_put_8 (output_bfd, 0xc7,
2507 contents + rel->r_offset - 2);
2508 bfd_put_8 (output_bfd,
2509 0xc0 | ((val >> 3) & 7),
2510 contents + rel->r_offset - 1);
2511 break;
2512 case 0x03:
2513 /* addl */
2514 BFD_ASSERT ((val & 0xc7) == 0x05);
2515 bfd_put_8 (output_bfd, 0x81,
2516 contents + rel->r_offset - 2);
2517 bfd_put_8 (output_bfd,
2518 0xc0 | ((val >> 3) & 7),
2519 contents + rel->r_offset - 1);
2520 break;
2521 default:
2522 BFD_FAIL ();
2523 break;
2524 }
2525 }
2526 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2527 contents + rel->r_offset);
2528 continue;
2529 }
2530 else
2531 {
2532 unsigned int val, type;
2533
2534 /* {IE_32,GOTIE}->LE transition:
2535 Originally it can be one of:
2536 subl foo(%reg1), %reg2
2537 movl foo(%reg1), %reg2
2538 addl foo(%reg1), %reg2
2539 We change it into:
2540 subl $foo, %reg2
2541 movl $foo, %reg2 (6 byte form)
2542 addl $foo, %reg2. */
2543 BFD_ASSERT (rel->r_offset >= 2);
2544 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2545 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2546 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2547 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2548 if (type == 0x8b)
2549 {
2550 /* movl */
2551 bfd_put_8 (output_bfd, 0xc7,
2552 contents + rel->r_offset - 2);
2553 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2554 contents + rel->r_offset - 1);
2555 }
2556 else if (type == 0x2b)
2557 {
2558 /* subl */
2559 bfd_put_8 (output_bfd, 0x81,
2560 contents + rel->r_offset - 2);
2561 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2562 contents + rel->r_offset - 1);
2563 }
2564 else if (type == 0x03)
2565 {
2566 /* addl */
2567 bfd_put_8 (output_bfd, 0x81,
2568 contents + rel->r_offset - 2);
2569 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2570 contents + rel->r_offset - 1);
2571 }
2572 else
2573 BFD_FAIL ();
2574 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2575 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2576 contents + rel->r_offset);
2577 else
2578 bfd_put_32 (output_bfd, tpoff (info, relocation),
2579 contents + rel->r_offset);
2580 continue;
2581 }
2582 }
2583
2584 if (htab->sgot == NULL)
2585 abort ();
2586
2587 if (h != NULL)
2588 off = h->got.offset;
2589 else
2590 {
2591 if (local_got_offsets == NULL)
2592 abort ();
2593
2594 off = local_got_offsets[r_symndx];
2595 }
2596
2597 if ((off & 1) != 0)
2598 off &= ~1;
2599 else
2600 {
2601 Elf_Internal_Rela outrel;
2602 bfd_byte *loc;
2603 int dr_type, indx;
2604
2605 if (htab->srelgot == NULL)
2606 abort ();
2607
2608 outrel.r_offset = (htab->sgot->output_section->vma
2609 + htab->sgot->output_offset + off);
2610
2611 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2612 if (r_type == R_386_TLS_GD)
2613 dr_type = R_386_TLS_DTPMOD32;
2614 else if (tls_type == GOT_TLS_IE_POS)
2615 dr_type = R_386_TLS_TPOFF;
2616 else
2617 dr_type = R_386_TLS_TPOFF32;
2618 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2619 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2620 htab->sgot->contents + off);
2621 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2622 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2623 htab->sgot->contents + off);
2624 else
2625 bfd_put_32 (output_bfd, 0,
2626 htab->sgot->contents + off);
2627 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2628 loc = htab->srelgot->contents;
2629 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2630 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2631
2632 if (r_type == R_386_TLS_GD)
2633 {
2634 if (indx == 0)
2635 {
2636 BFD_ASSERT (! unresolved_reloc);
2637 bfd_put_32 (output_bfd,
2638 relocation - dtpoff_base (info),
2639 htab->sgot->contents + off + 4);
2640 }
2641 else
2642 {
2643 bfd_put_32 (output_bfd, 0,
2644 htab->sgot->contents + off + 4);
2645 outrel.r_info = ELF32_R_INFO (indx,
2646 R_386_TLS_DTPOFF32);
2647 outrel.r_offset += 4;
2648 htab->srelgot->reloc_count++;
2649 loc += sizeof (Elf32_External_Rel);
2650 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2651 }
2652 }
2653 else if (tls_type == GOT_TLS_IE_BOTH)
2654 {
2655 bfd_put_32 (output_bfd,
2656 indx == 0 ? relocation - dtpoff_base (info) : 0,
2657 htab->sgot->contents + off + 4);
2658 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2659 outrel.r_offset += 4;
2660 htab->srelgot->reloc_count++;
2661 loc += sizeof (Elf32_External_Rel);
2662 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2663 }
2664
2665 if (h != NULL)
2666 h->got.offset |= 1;
2667 else
2668 local_got_offsets[r_symndx] |= 1;
2669 }
2670
2671 if (off >= (bfd_vma) -2)
2672 abort ();
2673 if (r_type == ELF32_R_TYPE (rel->r_info))
2674 {
2675 relocation = htab->sgot->output_offset + off;
2676 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2677 && tls_type == GOT_TLS_IE_BOTH)
2678 relocation += 4;
2679 if (r_type == R_386_TLS_IE)
2680 relocation += htab->sgot->output_section->vma;
2681 unresolved_reloc = FALSE;
2682 }
2683 else
2684 {
2685 unsigned int val, type;
2686 bfd_vma roff;
2687
2688 /* GD->IE transition. */
2689 BFD_ASSERT (rel->r_offset >= 2);
2690 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2691 BFD_ASSERT (type == 0x8d || type == 0x04);
2692 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2693 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2694 == 0xe8);
2695 BFD_ASSERT (rel + 1 < relend);
2696 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2697 roff = rel->r_offset - 3;
2698 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2699 if (type == 0x04)
2700 {
2701 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2702 Change it into:
2703 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2704 BFD_ASSERT (rel->r_offset >= 3);
2705 BFD_ASSERT (bfd_get_8 (input_bfd,
2706 contents + rel->r_offset - 3)
2707 == 0x8d);
2708 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2709 val >>= 3;
2710 }
2711 else
2712 {
2713 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2714 Change it into:
2715 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2716 BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size);
2717 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2718 BFD_ASSERT (bfd_get_8 (input_bfd,
2719 contents + rel->r_offset + 9)
2720 == 0x90);
2721 roff = rel->r_offset - 2;
2722 }
2723 memcpy (contents + roff,
2724 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2725 contents[roff + 7] = 0x80 | (val & 7);
2726 /* If foo is used only with foo@gotntpoff(%reg) and
2727 foo@indntpoff, but not with foo@gottpoff(%reg), change
2728 subl $foo@gottpoff(%reg), %eax
2729 into:
2730 addl $foo@gotntpoff(%reg), %eax. */
2731 if (r_type == R_386_TLS_GOTIE)
2732 {
2733 contents[roff + 6] = 0x03;
2734 if (tls_type == GOT_TLS_IE_BOTH)
2735 off += 4;
2736 }
2737 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2738 contents + roff + 8);
2739 /* Skip R_386_PLT32. */
2740 rel++;
2741 continue;
2742 }
2743 break;
2744
2745 case R_386_TLS_LDM:
2746 if (! info->shared)
2747 {
2748 unsigned int val;
2749
2750 /* LD->LE transition:
2751 Ensure it is:
2752 leal foo(%reg), %eax; call ___tls_get_addr.
2753 We change it into:
2754 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2755 BFD_ASSERT (rel->r_offset >= 2);
2756 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2757 == 0x8d);
2758 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2759 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2760 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2761 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2762 == 0xe8);
2763 BFD_ASSERT (rel + 1 < relend);
2764 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2765 memcpy (contents + rel->r_offset - 2,
2766 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2767 /* Skip R_386_PLT32. */
2768 rel++;
2769 continue;
2770 }
2771
2772 if (htab->sgot == NULL)
2773 abort ();
2774
2775 off = htab->tls_ldm_got.offset;
2776 if (off & 1)
2777 off &= ~1;
2778 else
2779 {
2780 Elf_Internal_Rela outrel;
2781 bfd_byte *loc;
2782
2783 if (htab->srelgot == NULL)
2784 abort ();
2785
2786 outrel.r_offset = (htab->sgot->output_section->vma
2787 + htab->sgot->output_offset + off);
2788
2789 bfd_put_32 (output_bfd, 0,
2790 htab->sgot->contents + off);
2791 bfd_put_32 (output_bfd, 0,
2792 htab->sgot->contents + off + 4);
2793 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2794 loc = htab->srelgot->contents;
2795 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2796 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2797 htab->tls_ldm_got.offset |= 1;
2798 }
2799 relocation = htab->sgot->output_offset + off;
2800 unresolved_reloc = FALSE;
2801 break;
2802
2803 case R_386_TLS_LDO_32:
2804 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2805 relocation -= dtpoff_base (info);
2806 else
2807 /* When converting LDO to LE, we must negate. */
2808 relocation = -tpoff (info, relocation);
2809 break;
2810
2811 case R_386_TLS_LE_32:
2812 case R_386_TLS_LE:
2813 if (info->shared)
2814 {
2815 Elf_Internal_Rela outrel;
2816 asection *sreloc;
2817 bfd_byte *loc;
2818 int indx;
2819
2820 outrel.r_offset = rel->r_offset
2821 + input_section->output_section->vma
2822 + input_section->output_offset;
2823 if (h != NULL && h->dynindx != -1)
2824 indx = h->dynindx;
2825 else
2826 indx = 0;
2827 if (r_type == R_386_TLS_LE_32)
2828 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2829 else
2830 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2831 sreloc = elf_section_data (input_section)->sreloc;
2832 if (sreloc == NULL)
2833 abort ();
2834 loc = sreloc->contents;
2835 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2836 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2837 if (indx)
2838 continue;
2839 else if (r_type == R_386_TLS_LE_32)
2840 relocation = dtpoff_base (info) - relocation;
2841 else
2842 relocation -= dtpoff_base (info);
2843 }
2844 else if (r_type == R_386_TLS_LE_32)
2845 relocation = tpoff (info, relocation);
2846 else
2847 relocation = -tpoff (info, relocation);
2848 break;
2849
2850 default:
2851 break;
2852 }
2853
2854 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2855 because such sections are not SEC_ALLOC and thus ld.so will
2856 not process them. */
2857 if (unresolved_reloc
2858 && !((input_section->flags & SEC_DEBUGGING) != 0
2859 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2860 {
2861 (*_bfd_error_handler)
2862 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2863 bfd_archive_filename (input_bfd),
2864 bfd_get_section_name (input_bfd, input_section),
2865 (long) rel->r_offset,
2866 h->root.root.string);
2867 return FALSE;
2868 }
2869
2870 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2871 contents, rel->r_offset,
2872 relocation, 0);
2873
2874 if (r != bfd_reloc_ok)
2875 {
2876 const char *name;
2877
2878 if (h != NULL)
2879 name = h->root.root.string;
2880 else
2881 {
2882 name = bfd_elf_string_from_elf_section (input_bfd,
2883 symtab_hdr->sh_link,
2884 sym->st_name);
2885 if (name == NULL)
2886 return FALSE;
2887 if (*name == '\0')
2888 name = bfd_section_name (input_bfd, sec);
2889 }
2890
2891 if (r == bfd_reloc_overflow)
2892 {
2893 if (! ((*info->callbacks->reloc_overflow)
2894 (info, name, howto->name, 0,
2895 input_bfd, input_section, rel->r_offset)))
2896 return FALSE;
2897 }
2898 else
2899 {
2900 (*_bfd_error_handler)
2901 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
2902 bfd_archive_filename (input_bfd),
2903 bfd_get_section_name (input_bfd, input_section),
2904 (long) rel->r_offset, name, (int) r);
2905 return FALSE;
2906 }
2907 }
2908 }
2909
2910 return TRUE;
2911 }
2912
2913 /* Finish up dynamic symbol handling. We set the contents of various
2914 dynamic sections here. */
2915
2916 static bfd_boolean
2917 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
2918 struct bfd_link_info *info,
2919 struct elf_link_hash_entry *h,
2920 Elf_Internal_Sym *sym)
2921 {
2922 struct elf_i386_link_hash_table *htab;
2923
2924 htab = elf_i386_hash_table (info);
2925
2926 if (h->plt.offset != (bfd_vma) -1)
2927 {
2928 bfd_vma plt_index;
2929 bfd_vma got_offset;
2930 Elf_Internal_Rela rel;
2931 bfd_byte *loc;
2932
2933 /* This symbol has an entry in the procedure linkage table. Set
2934 it up. */
2935
2936 if (h->dynindx == -1
2937 || htab->splt == NULL
2938 || htab->sgotplt == NULL
2939 || htab->srelplt == NULL)
2940 abort ();
2941
2942 /* Get the index in the procedure linkage table which
2943 corresponds to this symbol. This is the index of this symbol
2944 in all the symbols for which we are making plt entries. The
2945 first entry in the procedure linkage table is reserved. */
2946 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2947
2948 /* Get the offset into the .got table of the entry that
2949 corresponds to this function. Each .got entry is 4 bytes.
2950 The first three are reserved. */
2951 got_offset = (plt_index + 3) * 4;
2952
2953 /* Fill in the entry in the procedure linkage table. */
2954 if (! info->shared)
2955 {
2956 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
2957 PLT_ENTRY_SIZE);
2958 bfd_put_32 (output_bfd,
2959 (htab->sgotplt->output_section->vma
2960 + htab->sgotplt->output_offset
2961 + got_offset),
2962 htab->splt->contents + h->plt.offset + 2);
2963 }
2964 else
2965 {
2966 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
2967 PLT_ENTRY_SIZE);
2968 bfd_put_32 (output_bfd, got_offset,
2969 htab->splt->contents + h->plt.offset + 2);
2970 }
2971
2972 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
2973 htab->splt->contents + h->plt.offset + 7);
2974 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
2975 htab->splt->contents + h->plt.offset + 12);
2976
2977 /* Fill in the entry in the global offset table. */
2978 bfd_put_32 (output_bfd,
2979 (htab->splt->output_section->vma
2980 + htab->splt->output_offset
2981 + h->plt.offset
2982 + 6),
2983 htab->sgotplt->contents + got_offset);
2984
2985 /* Fill in the entry in the .rel.plt section. */
2986 rel.r_offset = (htab->sgotplt->output_section->vma
2987 + htab->sgotplt->output_offset
2988 + got_offset);
2989 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
2990 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
2991 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
2992
2993 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
2994 {
2995 /* Mark the symbol as undefined, rather than as defined in
2996 the .plt section. Leave the value if there were any
2997 relocations where pointer equality matters (this is a clue
2998 for the dynamic linker, to make function pointer
2999 comparisons work between an application and shared
3000 library), otherwise set it to zero. If a function is only
3001 called from a binary, there is no need to slow down
3002 shared libraries because of that. */
3003 sym->st_shndx = SHN_UNDEF;
3004 if ((h->elf_link_hash_flags & ELF_LINK_POINTER_EQUALITY_NEEDED) == 0)
3005 sym->st_value = 0;
3006 }
3007 }
3008
3009 if (h->got.offset != (bfd_vma) -1
3010 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3011 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3012 {
3013 Elf_Internal_Rela rel;
3014 bfd_byte *loc;
3015
3016 /* This symbol has an entry in the global offset table. Set it
3017 up. */
3018
3019 if (htab->sgot == NULL || htab->srelgot == NULL)
3020 abort ();
3021
3022 rel.r_offset = (htab->sgot->output_section->vma
3023 + htab->sgot->output_offset
3024 + (h->got.offset & ~(bfd_vma) 1));
3025
3026 /* If this is a static link, or it is a -Bsymbolic link and the
3027 symbol is defined locally or was forced to be local because
3028 of a version file, we just want to emit a RELATIVE reloc.
3029 The entry in the global offset table will already have been
3030 initialized in the relocate_section function. */
3031 if (info->shared
3032 && SYMBOL_REFERENCES_LOCAL (info, h))
3033 {
3034 BFD_ASSERT((h->got.offset & 1) != 0);
3035 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3036 }
3037 else
3038 {
3039 BFD_ASSERT((h->got.offset & 1) == 0);
3040 bfd_put_32 (output_bfd, (bfd_vma) 0,
3041 htab->sgot->contents + h->got.offset);
3042 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3043 }
3044
3045 loc = htab->srelgot->contents;
3046 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3047 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3048 }
3049
3050 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3051 {
3052 Elf_Internal_Rela rel;
3053 bfd_byte *loc;
3054
3055 /* This symbol needs a copy reloc. Set it up. */
3056
3057 if (h->dynindx == -1
3058 || (h->root.type != bfd_link_hash_defined
3059 && h->root.type != bfd_link_hash_defweak)
3060 || htab->srelbss == NULL)
3061 abort ();
3062
3063 rel.r_offset = (h->root.u.def.value
3064 + h->root.u.def.section->output_section->vma
3065 + h->root.u.def.section->output_offset);
3066 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3067 loc = htab->srelbss->contents;
3068 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3069 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3070 }
3071
3072 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3073 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3074 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3075 sym->st_shndx = SHN_ABS;
3076
3077 return TRUE;
3078 }
3079
3080 /* Used to decide how to sort relocs in an optimal manner for the
3081 dynamic linker, before writing them out. */
3082
3083 static enum elf_reloc_type_class
3084 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3085 {
3086 switch (ELF32_R_TYPE (rela->r_info))
3087 {
3088 case R_386_RELATIVE:
3089 return reloc_class_relative;
3090 case R_386_JUMP_SLOT:
3091 return reloc_class_plt;
3092 case R_386_COPY:
3093 return reloc_class_copy;
3094 default:
3095 return reloc_class_normal;
3096 }
3097 }
3098
3099 /* Finish up the dynamic sections. */
3100
3101 static bfd_boolean
3102 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3103 struct bfd_link_info *info)
3104 {
3105 struct elf_i386_link_hash_table *htab;
3106 bfd *dynobj;
3107 asection *sdyn;
3108
3109 htab = elf_i386_hash_table (info);
3110 dynobj = htab->elf.dynobj;
3111 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3112
3113 if (htab->elf.dynamic_sections_created)
3114 {
3115 Elf32_External_Dyn *dyncon, *dynconend;
3116
3117 if (sdyn == NULL || htab->sgot == NULL)
3118 abort ();
3119
3120 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3121 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3122 for (; dyncon < dynconend; dyncon++)
3123 {
3124 Elf_Internal_Dyn dyn;
3125 asection *s;
3126
3127 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3128
3129 switch (dyn.d_tag)
3130 {
3131 default:
3132 continue;
3133
3134 case DT_PLTGOT:
3135 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3136 break;
3137
3138 case DT_JMPREL:
3139 s = htab->srelplt;
3140 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3141 break;
3142
3143 case DT_PLTRELSZ:
3144 s = htab->srelplt;
3145 dyn.d_un.d_val = s->_raw_size;
3146 break;
3147
3148 case DT_RELSZ:
3149 /* My reading of the SVR4 ABI indicates that the
3150 procedure linkage table relocs (DT_JMPREL) should be
3151 included in the overall relocs (DT_REL). This is
3152 what Solaris does. However, UnixWare can not handle
3153 that case. Therefore, we override the DT_RELSZ entry
3154 here to make it not include the JMPREL relocs. */
3155 s = htab->srelplt;
3156 if (s == NULL)
3157 continue;
3158 dyn.d_un.d_val -= s->_raw_size;
3159 break;
3160
3161 case DT_REL:
3162 /* We may not be using the standard ELF linker script.
3163 If .rel.plt is the first .rel section, we adjust
3164 DT_REL to not include it. */
3165 s = htab->srelplt;
3166 if (s == NULL)
3167 continue;
3168 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3169 continue;
3170 dyn.d_un.d_ptr += s->_raw_size;
3171 break;
3172 }
3173
3174 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3175 }
3176
3177 /* Fill in the first entry in the procedure linkage table. */
3178 if (htab->splt && htab->splt->_raw_size > 0)
3179 {
3180 if (info->shared)
3181 memcpy (htab->splt->contents,
3182 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
3183 else
3184 {
3185 memcpy (htab->splt->contents,
3186 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
3187 bfd_put_32 (output_bfd,
3188 (htab->sgotplt->output_section->vma
3189 + htab->sgotplt->output_offset
3190 + 4),
3191 htab->splt->contents + 2);
3192 bfd_put_32 (output_bfd,
3193 (htab->sgotplt->output_section->vma
3194 + htab->sgotplt->output_offset
3195 + 8),
3196 htab->splt->contents + 8);
3197 }
3198
3199 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3200 really seem like the right value. */
3201 elf_section_data (htab->splt->output_section)
3202 ->this_hdr.sh_entsize = 4;
3203 }
3204 }
3205
3206 if (htab->sgotplt)
3207 {
3208 /* Fill in the first three entries in the global offset table. */
3209 if (htab->sgotplt->_raw_size > 0)
3210 {
3211 bfd_put_32 (output_bfd,
3212 (sdyn == NULL ? 0
3213 : sdyn->output_section->vma + sdyn->output_offset),
3214 htab->sgotplt->contents);
3215 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3216 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3217 }
3218
3219 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3220 }
3221 return TRUE;
3222 }
3223
3224 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3225 #define TARGET_LITTLE_NAME "elf32-i386"
3226 #define ELF_ARCH bfd_arch_i386
3227 #define ELF_MACHINE_CODE EM_386
3228 #define ELF_MAXPAGESIZE 0x1000
3229
3230 #define elf_backend_can_gc_sections 1
3231 #define elf_backend_can_refcount 1
3232 #define elf_backend_want_got_plt 1
3233 #define elf_backend_plt_readonly 1
3234 #define elf_backend_want_plt_sym 0
3235 #define elf_backend_got_header_size 12
3236
3237 /* Support RELA for objdump of prelink objects. */
3238 #define elf_info_to_howto elf_i386_info_to_howto_rel
3239 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3240
3241 #define bfd_elf32_mkobject elf_i386_mkobject
3242
3243 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3244 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3245 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3246
3247 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3248 #define elf_backend_check_relocs elf_i386_check_relocs
3249 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3250 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3251 #define elf_backend_fake_sections elf_i386_fake_sections
3252 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3253 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3254 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3255 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3256 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3257 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3258 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3259 #define elf_backend_relocate_section elf_i386_relocate_section
3260 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3261
3262 #include "elf32-target.h"
3263
3264 /* FreeBSD support. */
3265
3266 #undef TARGET_LITTLE_SYM
3267 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3268 #undef TARGET_LITTLE_NAME
3269 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3270
3271 /* The kernel recognizes executables as valid only if they carry a
3272 "FreeBSD" label in the ELF header. So we put this label on all
3273 executables and (for simplicity) also all other object files. */
3274
3275 static void
3276 elf_i386_post_process_headers (bfd *abfd,
3277 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3278 {
3279 Elf_Internal_Ehdr *i_ehdrp;
3280
3281 i_ehdrp = elf_elfheader (abfd);
3282
3283 /* Put an ABI label supported by FreeBSD >= 4.1. */
3284 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3285 #ifdef OLD_FREEBSD_ABI_LABEL
3286 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3287 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3288 #endif
3289 }
3290
3291 #undef elf_backend_post_process_headers
3292 #define elf_backend_post_process_headers elf_i386_post_process_headers
3293 #undef elf32_bed
3294 #define elf32_bed elf32_i386_fbsd_bed
3295
3296 #include "elf32-target.h"
GDB Binutils - Deliverables
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