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2003-11-22 Jakub Jelinek <jakub@redhat.com>
[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 static bfd_boolean
550 elf_i386_object_p (bfd *abfd)
551 {
552 /* Allocate our special target data. */
553 struct elf_i386_obj_tdata *new_tdata;
554 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
555 new_tdata = bfd_zalloc (abfd, amt);
556 if (new_tdata == NULL)
557 return FALSE;
558 new_tdata->root = *abfd->tdata.elf_obj_data;
559 abfd->tdata.any = new_tdata;
560 return TRUE;
561 }
562
563 /* i386 ELF linker hash table. */
564
565 struct elf_i386_link_hash_table
566 {
567 struct elf_link_hash_table elf;
568
569 /* Short-cuts to get to dynamic linker sections. */
570 asection *sgot;
571 asection *sgotplt;
572 asection *srelgot;
573 asection *splt;
574 asection *srelplt;
575 asection *sdynbss;
576 asection *srelbss;
577
578 union {
579 bfd_signed_vma refcount;
580 bfd_vma offset;
581 } tls_ldm_got;
582
583 /* Small local sym to section mapping cache. */
584 struct sym_sec_cache sym_sec;
585 };
586
587 /* Get the i386 ELF linker hash table from a link_info structure. */
588
589 #define elf_i386_hash_table(p) \
590 ((struct elf_i386_link_hash_table *) ((p)->hash))
591
592 /* Create an entry in an i386 ELF linker hash table. */
593
594 static struct bfd_hash_entry *
595 link_hash_newfunc (struct bfd_hash_entry *entry,
596 struct bfd_hash_table *table,
597 const char *string)
598 {
599 /* Allocate the structure if it has not already been allocated by a
600 subclass. */
601 if (entry == NULL)
602 {
603 entry = bfd_hash_allocate (table,
604 sizeof (struct elf_i386_link_hash_entry));
605 if (entry == NULL)
606 return entry;
607 }
608
609 /* Call the allocation method of the superclass. */
610 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
611 if (entry != NULL)
612 {
613 struct elf_i386_link_hash_entry *eh;
614
615 eh = (struct elf_i386_link_hash_entry *) entry;
616 eh->dyn_relocs = NULL;
617 eh->tls_type = GOT_UNKNOWN;
618 }
619
620 return entry;
621 }
622
623 /* Create an i386 ELF linker hash table. */
624
625 static struct bfd_link_hash_table *
626 elf_i386_link_hash_table_create (bfd *abfd)
627 {
628 struct elf_i386_link_hash_table *ret;
629 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
630
631 ret = bfd_malloc (amt);
632 if (ret == NULL)
633 return NULL;
634
635 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
636 {
637 free (ret);
638 return NULL;
639 }
640
641 ret->sgot = NULL;
642 ret->sgotplt = NULL;
643 ret->srelgot = NULL;
644 ret->splt = NULL;
645 ret->srelplt = NULL;
646 ret->sdynbss = NULL;
647 ret->srelbss = NULL;
648 ret->tls_ldm_got.refcount = 0;
649 ret->sym_sec.abfd = NULL;
650
651 return &ret->elf.root;
652 }
653
654 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
655 shortcuts to them in our hash table. */
656
657 static bfd_boolean
658 create_got_section (bfd *dynobj, struct bfd_link_info *info)
659 {
660 struct elf_i386_link_hash_table *htab;
661
662 if (! _bfd_elf_create_got_section (dynobj, info))
663 return FALSE;
664
665 htab = elf_i386_hash_table (info);
666 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
667 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
668 if (!htab->sgot || !htab->sgotplt)
669 abort ();
670
671 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
672 if (htab->srelgot == NULL
673 || ! bfd_set_section_flags (dynobj, htab->srelgot,
674 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
675 | SEC_IN_MEMORY | SEC_LINKER_CREATED
676 | SEC_READONLY))
677 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
678 return FALSE;
679 return TRUE;
680 }
681
682 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
683 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
684 hash table. */
685
686 static bfd_boolean
687 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
688 {
689 struct elf_i386_link_hash_table *htab;
690
691 htab = elf_i386_hash_table (info);
692 if (!htab->sgot && !create_got_section (dynobj, info))
693 return FALSE;
694
695 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
696 return FALSE;
697
698 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
699 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
700 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
701 if (!info->shared)
702 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
703
704 if (!htab->splt || !htab->srelplt || !htab->sdynbss
705 || (!info->shared && !htab->srelbss))
706 abort ();
707
708 return TRUE;
709 }
710
711 /* Copy the extra info we tack onto an elf_link_hash_entry. */
712
713 static void
714 elf_i386_copy_indirect_symbol (const struct elf_backend_data *bed,
715 struct elf_link_hash_entry *dir,
716 struct elf_link_hash_entry *ind)
717 {
718 struct elf_i386_link_hash_entry *edir, *eind;
719
720 edir = (struct elf_i386_link_hash_entry *) dir;
721 eind = (struct elf_i386_link_hash_entry *) ind;
722
723 if (eind->dyn_relocs != NULL)
724 {
725 if (edir->dyn_relocs != NULL)
726 {
727 struct elf_i386_dyn_relocs **pp;
728 struct elf_i386_dyn_relocs *p;
729
730 if (ind->root.type == bfd_link_hash_indirect)
731 abort ();
732
733 /* Add reloc counts against the weak sym to the strong sym
734 list. Merge any entries against the same section. */
735 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
736 {
737 struct elf_i386_dyn_relocs *q;
738
739 for (q = edir->dyn_relocs; q != NULL; q = q->next)
740 if (q->sec == p->sec)
741 {
742 q->pc_count += p->pc_count;
743 q->count += p->count;
744 *pp = p->next;
745 break;
746 }
747 if (q == NULL)
748 pp = &p->next;
749 }
750 *pp = edir->dyn_relocs;
751 }
752
753 edir->dyn_relocs = eind->dyn_relocs;
754 eind->dyn_relocs = NULL;
755 }
756
757 if (ind->root.type == bfd_link_hash_indirect
758 && dir->got.refcount <= 0)
759 {
760 edir->tls_type = eind->tls_type;
761 eind->tls_type = GOT_UNKNOWN;
762 }
763
764 if (ELIMINATE_COPY_RELOCS
765 && ind->root.type != bfd_link_hash_indirect
766 && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
767 /* If called to transfer flags for a weakdef during processing
768 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
769 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
770 dir->elf_link_hash_flags |=
771 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC
772 | ELF_LINK_HASH_REF_REGULAR
773 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
774 | ELF_LINK_HASH_NEEDS_PLT
775 | ELF_LINK_POINTER_EQUALITY_NEEDED));
776 else
777 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
778 }
779
780 static int
781 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
782 {
783 if (info->shared)
784 return r_type;
785
786 switch (r_type)
787 {
788 case R_386_TLS_GD:
789 case R_386_TLS_IE_32:
790 if (is_local)
791 return R_386_TLS_LE_32;
792 return R_386_TLS_IE_32;
793 case R_386_TLS_IE:
794 case R_386_TLS_GOTIE:
795 if (is_local)
796 return R_386_TLS_LE_32;
797 return r_type;
798 case R_386_TLS_LDM:
799 return R_386_TLS_LE_32;
800 }
801
802 return r_type;
803 }
804
805 /* Look through the relocs for a section during the first phase, and
806 calculate needed space in the global offset table, procedure linkage
807 table, and dynamic reloc sections. */
808
809 static bfd_boolean
810 elf_i386_check_relocs (bfd *abfd,
811 struct bfd_link_info *info,
812 asection *sec,
813 const Elf_Internal_Rela *relocs)
814 {
815 struct elf_i386_link_hash_table *htab;
816 Elf_Internal_Shdr *symtab_hdr;
817 struct elf_link_hash_entry **sym_hashes;
818 const Elf_Internal_Rela *rel;
819 const Elf_Internal_Rela *rel_end;
820 asection *sreloc;
821
822 if (info->relocatable)
823 return TRUE;
824
825 htab = elf_i386_hash_table (info);
826 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
827 sym_hashes = elf_sym_hashes (abfd);
828
829 sreloc = NULL;
830
831 rel_end = relocs + sec->reloc_count;
832 for (rel = relocs; rel < rel_end; rel++)
833 {
834 unsigned int r_type;
835 unsigned long r_symndx;
836 struct elf_link_hash_entry *h;
837
838 r_symndx = ELF32_R_SYM (rel->r_info);
839 r_type = ELF32_R_TYPE (rel->r_info);
840
841 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
842 {
843 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
844 bfd_archive_filename (abfd),
845 r_symndx);
846 return FALSE;
847 }
848
849 if (r_symndx < symtab_hdr->sh_info)
850 h = NULL;
851 else
852 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
853
854 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
855
856 switch (r_type)
857 {
858 case R_386_TLS_LDM:
859 htab->tls_ldm_got.refcount += 1;
860 goto create_got;
861
862 case R_386_PLT32:
863 /* This symbol requires a procedure linkage table entry. We
864 actually build the entry in adjust_dynamic_symbol,
865 because this might be a case of linking PIC code which is
866 never referenced by a dynamic object, in which case we
867 don't need to generate a procedure linkage table entry
868 after all. */
869
870 /* If this is a local symbol, we resolve it directly without
871 creating a procedure linkage table entry. */
872 if (h == NULL)
873 continue;
874
875 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
876 h->plt.refcount += 1;
877 break;
878
879 case R_386_TLS_IE_32:
880 case R_386_TLS_IE:
881 case R_386_TLS_GOTIE:
882 if (info->shared)
883 info->flags |= DF_STATIC_TLS;
884 /* Fall through */
885
886 case R_386_GOT32:
887 case R_386_TLS_GD:
888 /* This symbol requires a global offset table entry. */
889 {
890 int tls_type, old_tls_type;
891
892 switch (r_type)
893 {
894 default:
895 case R_386_GOT32: tls_type = GOT_NORMAL; break;
896 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
897 case R_386_TLS_IE_32:
898 if (ELF32_R_TYPE (rel->r_info) == r_type)
899 tls_type = GOT_TLS_IE_NEG;
900 else
901 /* If this is a GD->IE transition, we may use either of
902 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
903 tls_type = GOT_TLS_IE;
904 break;
905 case R_386_TLS_IE:
906 case R_386_TLS_GOTIE:
907 tls_type = GOT_TLS_IE_POS; break;
908 }
909
910 if (h != NULL)
911 {
912 h->got.refcount += 1;
913 old_tls_type = elf_i386_hash_entry(h)->tls_type;
914 }
915 else
916 {
917 bfd_signed_vma *local_got_refcounts;
918
919 /* This is a global offset table entry for a local symbol. */
920 local_got_refcounts = elf_local_got_refcounts (abfd);
921 if (local_got_refcounts == NULL)
922 {
923 bfd_size_type size;
924
925 size = symtab_hdr->sh_info;
926 size *= (sizeof (bfd_signed_vma) + sizeof(char));
927 local_got_refcounts = bfd_zalloc (abfd, size);
928 if (local_got_refcounts == NULL)
929 return FALSE;
930 elf_local_got_refcounts (abfd) = local_got_refcounts;
931 elf_i386_local_got_tls_type (abfd)
932 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
933 }
934 local_got_refcounts[r_symndx] += 1;
935 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
936 }
937
938 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
939 tls_type |= old_tls_type;
940 /* If a TLS symbol is accessed using IE at least once,
941 there is no point to use dynamic model for it. */
942 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
943 && (old_tls_type != GOT_TLS_GD
944 || (tls_type & GOT_TLS_IE) == 0))
945 {
946 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
947 tls_type = old_tls_type;
948 else
949 {
950 (*_bfd_error_handler)
951 (_("%s: `%s' accessed both as normal and "
952 "thread local symbol"),
953 bfd_archive_filename (abfd),
954 h ? h->root.root.string : "<local>");
955 return FALSE;
956 }
957 }
958
959 if (old_tls_type != tls_type)
960 {
961 if (h != NULL)
962 elf_i386_hash_entry (h)->tls_type = tls_type;
963 else
964 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
965 }
966 }
967 /* Fall through */
968
969 case R_386_GOTOFF:
970 case R_386_GOTPC:
971 create_got:
972 if (htab->sgot == NULL)
973 {
974 if (htab->elf.dynobj == NULL)
975 htab->elf.dynobj = abfd;
976 if (!create_got_section (htab->elf.dynobj, info))
977 return FALSE;
978 }
979 if (r_type != R_386_TLS_IE)
980 break;
981 /* Fall through */
982
983 case R_386_TLS_LE_32:
984 case R_386_TLS_LE:
985 if (!info->shared)
986 break;
987 info->flags |= DF_STATIC_TLS;
988 /* Fall through */
989
990 case R_386_32:
991 case R_386_PC32:
992 if (h != NULL && !info->shared)
993 {
994 /* If this reloc is in a read-only section, we might
995 need a copy reloc. We can't check reliably at this
996 stage whether the section is read-only, as input
997 sections have not yet been mapped to output sections.
998 Tentatively set the flag for now, and correct in
999 adjust_dynamic_symbol. */
1000 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
1001
1002 /* We may need a .plt entry if the function this reloc
1003 refers to is in a shared lib. */
1004 h->plt.refcount += 1;
1005 if (r_type != R_386_PC32)
1006 h->elf_link_hash_flags |= ELF_LINK_POINTER_EQUALITY_NEEDED;
1007 }
1008
1009 /* If we are creating a shared library, and this is a reloc
1010 against a global symbol, or a non PC relative reloc
1011 against a local symbol, then we need to copy the reloc
1012 into the shared library. However, if we are linking with
1013 -Bsymbolic, we do not need to copy a reloc against a
1014 global symbol which is defined in an object we are
1015 including in the link (i.e., DEF_REGULAR is set). At
1016 this point we have not seen all the input files, so it is
1017 possible that DEF_REGULAR is not set now but will be set
1018 later (it is never cleared). In case of a weak definition,
1019 DEF_REGULAR may be cleared later by a strong definition in
1020 a shared library. We account for that possibility below by
1021 storing information in the relocs_copied field of the hash
1022 table entry. A similar situation occurs when creating
1023 shared libraries and symbol visibility changes render the
1024 symbol local.
1025
1026 If on the other hand, we are creating an executable, we
1027 may need to keep relocations for symbols satisfied by a
1028 dynamic library if we manage to avoid copy relocs for the
1029 symbol. */
1030 if ((info->shared
1031 && (sec->flags & SEC_ALLOC) != 0
1032 && (r_type != R_386_PC32
1033 || (h != NULL
1034 && (! info->symbolic
1035 || h->root.type == bfd_link_hash_defweak
1036 || (h->elf_link_hash_flags
1037 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1038 || (ELIMINATE_COPY_RELOCS
1039 && !info->shared
1040 && (sec->flags & SEC_ALLOC) != 0
1041 && h != NULL
1042 && (h->root.type == bfd_link_hash_defweak
1043 || (h->elf_link_hash_flags
1044 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1045 {
1046 struct elf_i386_dyn_relocs *p;
1047 struct elf_i386_dyn_relocs **head;
1048
1049 /* We must copy these reloc types into the output file.
1050 Create a reloc section in dynobj and make room for
1051 this reloc. */
1052 if (sreloc == NULL)
1053 {
1054 const char *name;
1055 bfd *dynobj;
1056 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1057 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1058
1059 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1060 if (name == NULL)
1061 return FALSE;
1062
1063 if (strncmp (name, ".rel", 4) != 0
1064 || strcmp (bfd_get_section_name (abfd, sec),
1065 name + 4) != 0)
1066 {
1067 (*_bfd_error_handler)
1068 (_("%s: bad relocation section name `%s\'"),
1069 bfd_archive_filename (abfd), name);
1070 }
1071
1072 if (htab->elf.dynobj == NULL)
1073 htab->elf.dynobj = abfd;
1074
1075 dynobj = htab->elf.dynobj;
1076 sreloc = bfd_get_section_by_name (dynobj, name);
1077 if (sreloc == NULL)
1078 {
1079 flagword flags;
1080
1081 sreloc = bfd_make_section (dynobj, name);
1082 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1083 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1084 if ((sec->flags & SEC_ALLOC) != 0)
1085 flags |= SEC_ALLOC | SEC_LOAD;
1086 if (sreloc == NULL
1087 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1088 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1089 return FALSE;
1090 }
1091 elf_section_data (sec)->sreloc = sreloc;
1092 }
1093
1094 /* If this is a global symbol, we count the number of
1095 relocations we need for this symbol. */
1096 if (h != NULL)
1097 {
1098 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1099 }
1100 else
1101 {
1102 /* Track dynamic relocs needed for local syms too.
1103 We really need local syms available to do this
1104 easily. Oh well. */
1105
1106 asection *s;
1107 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1108 sec, r_symndx);
1109 if (s == NULL)
1110 return FALSE;
1111
1112 head = ((struct elf_i386_dyn_relocs **)
1113 &elf_section_data (s)->local_dynrel);
1114 }
1115
1116 p = *head;
1117 if (p == NULL || p->sec != sec)
1118 {
1119 bfd_size_type amt = sizeof *p;
1120 p = bfd_alloc (htab->elf.dynobj, amt);
1121 if (p == NULL)
1122 return FALSE;
1123 p->next = *head;
1124 *head = p;
1125 p->sec = sec;
1126 p->count = 0;
1127 p->pc_count = 0;
1128 }
1129
1130 p->count += 1;
1131 if (r_type == R_386_PC32)
1132 p->pc_count += 1;
1133 }
1134 break;
1135
1136 /* This relocation describes the C++ object vtable hierarchy.
1137 Reconstruct it for later use during GC. */
1138 case R_386_GNU_VTINHERIT:
1139 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1140 return FALSE;
1141 break;
1142
1143 /* This relocation describes which C++ vtable entries are actually
1144 used. Record for later use during GC. */
1145 case R_386_GNU_VTENTRY:
1146 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1147 return FALSE;
1148 break;
1149
1150 default:
1151 break;
1152 }
1153 }
1154
1155 return TRUE;
1156 }
1157
1158 /* Return the section that should be marked against GC for a given
1159 relocation. */
1160
1161 static asection *
1162 elf_i386_gc_mark_hook (asection *sec,
1163 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1164 Elf_Internal_Rela *rel,
1165 struct elf_link_hash_entry *h,
1166 Elf_Internal_Sym *sym)
1167 {
1168 if (h != NULL)
1169 {
1170 switch (ELF32_R_TYPE (rel->r_info))
1171 {
1172 case R_386_GNU_VTINHERIT:
1173 case R_386_GNU_VTENTRY:
1174 break;
1175
1176 default:
1177 switch (h->root.type)
1178 {
1179 case bfd_link_hash_defined:
1180 case bfd_link_hash_defweak:
1181 return h->root.u.def.section;
1182
1183 case bfd_link_hash_common:
1184 return h->root.u.c.p->section;
1185
1186 default:
1187 break;
1188 }
1189 }
1190 }
1191 else
1192 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1193
1194 return NULL;
1195 }
1196
1197 /* Update the got entry reference counts for the section being removed. */
1198
1199 static bfd_boolean
1200 elf_i386_gc_sweep_hook (bfd *abfd,
1201 struct bfd_link_info *info,
1202 asection *sec,
1203 const Elf_Internal_Rela *relocs)
1204 {
1205 Elf_Internal_Shdr *symtab_hdr;
1206 struct elf_link_hash_entry **sym_hashes;
1207 bfd_signed_vma *local_got_refcounts;
1208 const Elf_Internal_Rela *rel, *relend;
1209
1210 elf_section_data (sec)->local_dynrel = NULL;
1211
1212 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1213 sym_hashes = elf_sym_hashes (abfd);
1214 local_got_refcounts = elf_local_got_refcounts (abfd);
1215
1216 relend = relocs + sec->reloc_count;
1217 for (rel = relocs; rel < relend; rel++)
1218 {
1219 unsigned long r_symndx;
1220 unsigned int r_type;
1221 struct elf_link_hash_entry *h = NULL;
1222
1223 r_symndx = ELF32_R_SYM (rel->r_info);
1224 if (r_symndx >= symtab_hdr->sh_info)
1225 {
1226 struct elf_i386_link_hash_entry *eh;
1227 struct elf_i386_dyn_relocs **pp;
1228 struct elf_i386_dyn_relocs *p;
1229
1230 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1231 eh = (struct elf_i386_link_hash_entry *) h;
1232
1233 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1234 if (p->sec == sec)
1235 {
1236 /* Everything must go for SEC. */
1237 *pp = p->next;
1238 break;
1239 }
1240 }
1241
1242 r_type = ELF32_R_TYPE (rel->r_info);
1243 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1244 switch (r_type)
1245 {
1246 case R_386_TLS_LDM:
1247 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1248 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1249 break;
1250
1251 case R_386_TLS_GD:
1252 case R_386_TLS_IE_32:
1253 case R_386_TLS_IE:
1254 case R_386_TLS_GOTIE:
1255 case R_386_GOT32:
1256 if (h != NULL)
1257 {
1258 if (h->got.refcount > 0)
1259 h->got.refcount -= 1;
1260 }
1261 else if (local_got_refcounts != NULL)
1262 {
1263 if (local_got_refcounts[r_symndx] > 0)
1264 local_got_refcounts[r_symndx] -= 1;
1265 }
1266 break;
1267
1268 case R_386_32:
1269 case R_386_PC32:
1270 if (info->shared)
1271 break;
1272 /* Fall through */
1273
1274 case R_386_PLT32:
1275 if (h != NULL)
1276 {
1277 if (h->plt.refcount > 0)
1278 h->plt.refcount -= 1;
1279 }
1280 break;
1281
1282 default:
1283 break;
1284 }
1285 }
1286
1287 return TRUE;
1288 }
1289
1290 /* Adjust a symbol defined by a dynamic object and referenced by a
1291 regular object. The current definition is in some section of the
1292 dynamic object, but we're not including those sections. We have to
1293 change the definition to something the rest of the link can
1294 understand. */
1295
1296 static bfd_boolean
1297 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1298 struct elf_link_hash_entry *h)
1299 {
1300 struct elf_i386_link_hash_table *htab;
1301 asection *s;
1302 unsigned int power_of_two;
1303
1304 /* If this is a function, put it in the procedure linkage table. We
1305 will fill in the contents of the procedure linkage table later,
1306 when we know the address of the .got section. */
1307 if (h->type == STT_FUNC
1308 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1309 {
1310 if (h->plt.refcount <= 0
1311 || SYMBOL_CALLS_LOCAL (info, h)
1312 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1313 && h->root.type == bfd_link_hash_undefweak))
1314 {
1315 /* This case can occur if we saw a PLT32 reloc in an input
1316 file, but the symbol was never referred to by a dynamic
1317 object, or if all references were garbage collected. In
1318 such a case, we don't actually need to build a procedure
1319 linkage table, and we can just do a PC32 reloc instead. */
1320 h->plt.offset = (bfd_vma) -1;
1321 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1322 }
1323
1324 return TRUE;
1325 }
1326 else
1327 /* It's possible that we incorrectly decided a .plt reloc was
1328 needed for an R_386_PC32 reloc to a non-function sym in
1329 check_relocs. We can't decide accurately between function and
1330 non-function syms in check-relocs; Objects loaded later in
1331 the link may change h->type. So fix it now. */
1332 h->plt.offset = (bfd_vma) -1;
1333
1334 /* If this is a weak symbol, and there is a real definition, the
1335 processor independent code will have arranged for us to see the
1336 real definition first, and we can just use the same value. */
1337 if (h->weakdef != NULL)
1338 {
1339 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1340 || h->weakdef->root.type == bfd_link_hash_defweak);
1341 h->root.u.def.section = h->weakdef->root.u.def.section;
1342 h->root.u.def.value = h->weakdef->root.u.def.value;
1343 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1344 h->elf_link_hash_flags
1345 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF)
1346 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF));
1347 return TRUE;
1348 }
1349
1350 /* This is a reference to a symbol defined by a dynamic object which
1351 is not a function. */
1352
1353 /* If we are creating a shared library, we must presume that the
1354 only references to the symbol are via the global offset table.
1355 For such cases we need not do anything here; the relocations will
1356 be handled correctly by relocate_section. */
1357 if (info->shared)
1358 return TRUE;
1359
1360 /* If there are no references to this symbol that do not use the
1361 GOT, we don't need to generate a copy reloc. */
1362 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1363 return TRUE;
1364
1365 /* If -z nocopyreloc was given, we won't generate them either. */
1366 if (info->nocopyreloc)
1367 {
1368 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1369 return TRUE;
1370 }
1371
1372 if (ELIMINATE_COPY_RELOCS)
1373 {
1374 struct elf_i386_link_hash_entry * eh;
1375 struct elf_i386_dyn_relocs *p;
1376
1377 eh = (struct elf_i386_link_hash_entry *) h;
1378 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1379 {
1380 s = p->sec->output_section;
1381 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1382 break;
1383 }
1384
1385 /* If we didn't find any dynamic relocs in read-only sections, then
1386 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1387 if (p == NULL)
1388 {
1389 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1390 return TRUE;
1391 }
1392 }
1393
1394 /* We must allocate the symbol in our .dynbss section, which will
1395 become part of the .bss section of the executable. There will be
1396 an entry for this symbol in the .dynsym section. The dynamic
1397 object will contain position independent code, so all references
1398 from the dynamic object to this symbol will go through the global
1399 offset table. The dynamic linker will use the .dynsym entry to
1400 determine the address it must put in the global offset table, so
1401 both the dynamic object and the regular object will refer to the
1402 same memory location for the variable. */
1403
1404 htab = elf_i386_hash_table (info);
1405
1406 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1407 copy the initial value out of the dynamic object and into the
1408 runtime process image. */
1409 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1410 {
1411 htab->srelbss->_raw_size += sizeof (Elf32_External_Rel);
1412 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1413 }
1414
1415 /* We need to figure out the alignment required for this symbol. I
1416 have no idea how ELF linkers handle this. */
1417 power_of_two = bfd_log2 (h->size);
1418 if (power_of_two > 3)
1419 power_of_two = 3;
1420
1421 /* Apply the required alignment. */
1422 s = htab->sdynbss;
1423 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1424 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1425 {
1426 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1427 return FALSE;
1428 }
1429
1430 /* Define the symbol as being at this point in the section. */
1431 h->root.u.def.section = s;
1432 h->root.u.def.value = s->_raw_size;
1433
1434 /* Increment the section size to make room for the symbol. */
1435 s->_raw_size += h->size;
1436
1437 return TRUE;
1438 }
1439
1440 /* This is the condition under which elf_i386_finish_dynamic_symbol
1441 will be called from elflink.h. If elflink.h doesn't call our
1442 finish_dynamic_symbol routine, we'll need to do something about
1443 initializing any .plt and .got entries in elf_i386_relocate_section. */
1444 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1445 ((DYN) \
1446 && ((SHARED) \
1447 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1448 && ((H)->dynindx != -1 \
1449 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1450
1451 /* Allocate space in .plt, .got and associated reloc sections for
1452 dynamic relocs. */
1453
1454 static bfd_boolean
1455 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1456 {
1457 struct bfd_link_info *info;
1458 struct elf_i386_link_hash_table *htab;
1459 struct elf_i386_link_hash_entry *eh;
1460 struct elf_i386_dyn_relocs *p;
1461
1462 if (h->root.type == bfd_link_hash_indirect)
1463 return TRUE;
1464
1465 if (h->root.type == bfd_link_hash_warning)
1466 /* When warning symbols are created, they **replace** the "real"
1467 entry in the hash table, thus we never get to see the real
1468 symbol in a hash traversal. So look at it now. */
1469 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1470
1471 info = (struct bfd_link_info *) inf;
1472 htab = elf_i386_hash_table (info);
1473
1474 if (htab->elf.dynamic_sections_created
1475 && h->plt.refcount > 0)
1476 {
1477 /* Make sure this symbol is output as a dynamic symbol.
1478 Undefined weak syms won't yet be marked as dynamic. */
1479 if (h->dynindx == -1
1480 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1481 {
1482 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1483 return FALSE;
1484 }
1485
1486 if (info->shared
1487 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1488 {
1489 asection *s = htab->splt;
1490
1491 /* If this is the first .plt entry, make room for the special
1492 first entry. */
1493 if (s->_raw_size == 0)
1494 s->_raw_size += PLT_ENTRY_SIZE;
1495
1496 h->plt.offset = s->_raw_size;
1497
1498 /* If this symbol is not defined in a regular file, and we are
1499 not generating a shared library, then set the symbol to this
1500 location in the .plt. This is required to make function
1501 pointers compare as equal between the normal executable and
1502 the shared library. */
1503 if (! info->shared
1504 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1505 {
1506 h->root.u.def.section = s;
1507 h->root.u.def.value = h->plt.offset;
1508 }
1509
1510 /* Make room for this entry. */
1511 s->_raw_size += PLT_ENTRY_SIZE;
1512
1513 /* We also need to make an entry in the .got.plt section, which
1514 will be placed in the .got section by the linker script. */
1515 htab->sgotplt->_raw_size += 4;
1516
1517 /* We also need to make an entry in the .rel.plt section. */
1518 htab->srelplt->_raw_size += sizeof (Elf32_External_Rel);
1519 }
1520 else
1521 {
1522 h->plt.offset = (bfd_vma) -1;
1523 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1524 }
1525 }
1526 else
1527 {
1528 h->plt.offset = (bfd_vma) -1;
1529 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1530 }
1531
1532 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1533 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1534 if (h->got.refcount > 0
1535 && !info->shared
1536 && h->dynindx == -1
1537 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1538 h->got.offset = (bfd_vma) -1;
1539 else if (h->got.refcount > 0)
1540 {
1541 asection *s;
1542 bfd_boolean dyn;
1543 int tls_type = elf_i386_hash_entry(h)->tls_type;
1544
1545 /* Make sure this symbol is output as a dynamic symbol.
1546 Undefined weak syms won't yet be marked as dynamic. */
1547 if (h->dynindx == -1
1548 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1549 {
1550 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1551 return FALSE;
1552 }
1553
1554 s = htab->sgot;
1555 h->got.offset = s->_raw_size;
1556 s->_raw_size += 4;
1557 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1558 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1559 s->_raw_size += 4;
1560 dyn = htab->elf.dynamic_sections_created;
1561 /* R_386_TLS_IE_32 needs one dynamic relocation,
1562 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1563 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1564 need two), R_386_TLS_GD needs one if local symbol and two if
1565 global. */
1566 if (tls_type == GOT_TLS_IE_BOTH)
1567 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1568 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1569 || (tls_type & GOT_TLS_IE))
1570 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1571 else if (tls_type == GOT_TLS_GD)
1572 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1573 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1574 || h->root.type != bfd_link_hash_undefweak)
1575 && (info->shared
1576 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1577 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1578 }
1579 else
1580 h->got.offset = (bfd_vma) -1;
1581
1582 eh = (struct elf_i386_link_hash_entry *) h;
1583 if (eh->dyn_relocs == NULL)
1584 return TRUE;
1585
1586 /* In the shared -Bsymbolic case, discard space allocated for
1587 dynamic pc-relative relocs against symbols which turn out to be
1588 defined in regular objects. For the normal shared case, discard
1589 space for pc-relative relocs that have become local due to symbol
1590 visibility changes. */
1591
1592 if (info->shared)
1593 {
1594 /* The only reloc that uses pc_count is R_386_PC32, which will
1595 appear on a call or on something like ".long foo - .". We
1596 want calls to protected symbols to resolve directly to the
1597 function rather than going via the plt. If people want
1598 function pointer comparisons to work as expected then they
1599 should avoid writing assembly like ".long foo - .". */
1600 if (SYMBOL_CALLS_LOCAL (info, h))
1601 {
1602 struct elf_i386_dyn_relocs **pp;
1603
1604 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1605 {
1606 p->count -= p->pc_count;
1607 p->pc_count = 0;
1608 if (p->count == 0)
1609 *pp = p->next;
1610 else
1611 pp = &p->next;
1612 }
1613 }
1614
1615 /* Also discard relocs on undefined weak syms with non-default
1616 visibility. */
1617 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1618 && h->root.type == bfd_link_hash_undefweak)
1619 eh->dyn_relocs = NULL;
1620 }
1621 else if (ELIMINATE_COPY_RELOCS)
1622 {
1623 /* For the non-shared case, discard space for relocs against
1624 symbols which turn out to need copy relocs or are not
1625 dynamic. */
1626
1627 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1628 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1629 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1630 || (htab->elf.dynamic_sections_created
1631 && (h->root.type == bfd_link_hash_undefweak
1632 || h->root.type == bfd_link_hash_undefined))))
1633 {
1634 /* Make sure this symbol is output as a dynamic symbol.
1635 Undefined weak syms won't yet be marked as dynamic. */
1636 if (h->dynindx == -1
1637 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1638 {
1639 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1640 return FALSE;
1641 }
1642
1643 /* If that succeeded, we know we'll be keeping all the
1644 relocs. */
1645 if (h->dynindx != -1)
1646 goto keep;
1647 }
1648
1649 eh->dyn_relocs = NULL;
1650
1651 keep: ;
1652 }
1653
1654 /* Finally, allocate space. */
1655 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1656 {
1657 asection *sreloc = elf_section_data (p->sec)->sreloc;
1658 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel);
1659 }
1660
1661 return TRUE;
1662 }
1663
1664 /* Find any dynamic relocs that apply to read-only sections. */
1665
1666 static bfd_boolean
1667 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1668 {
1669 struct elf_i386_link_hash_entry *eh;
1670 struct elf_i386_dyn_relocs *p;
1671
1672 if (h->root.type == bfd_link_hash_warning)
1673 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1674
1675 eh = (struct elf_i386_link_hash_entry *) h;
1676 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1677 {
1678 asection *s = p->sec->output_section;
1679
1680 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1681 {
1682 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1683
1684 info->flags |= DF_TEXTREL;
1685
1686 /* Not an error, just cut short the traversal. */
1687 return FALSE;
1688 }
1689 }
1690 return TRUE;
1691 }
1692
1693 /* Set the sizes of the dynamic sections. */
1694
1695 static bfd_boolean
1696 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1697 struct bfd_link_info *info)
1698 {
1699 struct elf_i386_link_hash_table *htab;
1700 bfd *dynobj;
1701 asection *s;
1702 bfd_boolean relocs;
1703 bfd *ibfd;
1704
1705 htab = elf_i386_hash_table (info);
1706 dynobj = htab->elf.dynobj;
1707 if (dynobj == NULL)
1708 abort ();
1709
1710 if (htab->elf.dynamic_sections_created)
1711 {
1712 /* Set the contents of the .interp section to the interpreter. */
1713 if (info->executable)
1714 {
1715 s = bfd_get_section_by_name (dynobj, ".interp");
1716 if (s == NULL)
1717 abort ();
1718 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1719 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1720 }
1721 }
1722
1723 /* Set up .got offsets for local syms, and space for local dynamic
1724 relocs. */
1725 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1726 {
1727 bfd_signed_vma *local_got;
1728 bfd_signed_vma *end_local_got;
1729 char *local_tls_type;
1730 bfd_size_type locsymcount;
1731 Elf_Internal_Shdr *symtab_hdr;
1732 asection *srel;
1733
1734 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1735 continue;
1736
1737 for (s = ibfd->sections; s != NULL; s = s->next)
1738 {
1739 struct elf_i386_dyn_relocs *p;
1740
1741 for (p = *((struct elf_i386_dyn_relocs **)
1742 &elf_section_data (s)->local_dynrel);
1743 p != NULL;
1744 p = p->next)
1745 {
1746 if (!bfd_is_abs_section (p->sec)
1747 && bfd_is_abs_section (p->sec->output_section))
1748 {
1749 /* Input section has been discarded, either because
1750 it is a copy of a linkonce section or due to
1751 linker script /DISCARD/, so we'll be discarding
1752 the relocs too. */
1753 }
1754 else if (p->count != 0)
1755 {
1756 srel = elf_section_data (p->sec)->sreloc;
1757 srel->_raw_size += p->count * sizeof (Elf32_External_Rel);
1758 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1759 info->flags |= DF_TEXTREL;
1760 }
1761 }
1762 }
1763
1764 local_got = elf_local_got_refcounts (ibfd);
1765 if (!local_got)
1766 continue;
1767
1768 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1769 locsymcount = symtab_hdr->sh_info;
1770 end_local_got = local_got + locsymcount;
1771 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1772 s = htab->sgot;
1773 srel = htab->srelgot;
1774 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1775 {
1776 if (*local_got > 0)
1777 {
1778 *local_got = s->_raw_size;
1779 s->_raw_size += 4;
1780 if (*local_tls_type == GOT_TLS_GD
1781 || *local_tls_type == GOT_TLS_IE_BOTH)
1782 s->_raw_size += 4;
1783 if (info->shared
1784 || *local_tls_type == GOT_TLS_GD
1785 || (*local_tls_type & GOT_TLS_IE))
1786 {
1787 if (*local_tls_type == GOT_TLS_IE_BOTH)
1788 srel->_raw_size += 2 * sizeof (Elf32_External_Rel);
1789 else
1790 srel->_raw_size += sizeof (Elf32_External_Rel);
1791 }
1792 }
1793 else
1794 *local_got = (bfd_vma) -1;
1795 }
1796 }
1797
1798 if (htab->tls_ldm_got.refcount > 0)
1799 {
1800 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1801 relocs. */
1802 htab->tls_ldm_got.offset = htab->sgot->_raw_size;
1803 htab->sgot->_raw_size += 8;
1804 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1805 }
1806 else
1807 htab->tls_ldm_got.offset = -1;
1808
1809 /* Allocate global sym .plt and .got entries, and space for global
1810 sym dynamic relocs. */
1811 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1812
1813 /* We now have determined the sizes of the various dynamic sections.
1814 Allocate memory for them. */
1815 relocs = FALSE;
1816 for (s = dynobj->sections; s != NULL; s = s->next)
1817 {
1818 if ((s->flags & SEC_LINKER_CREATED) == 0)
1819 continue;
1820
1821 if (s == htab->splt
1822 || s == htab->sgot
1823 || s == htab->sgotplt)
1824 {
1825 /* Strip this section if we don't need it; see the
1826 comment below. */
1827 }
1828 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1829 {
1830 if (s->_raw_size != 0 && s != htab->srelplt)
1831 relocs = TRUE;
1832
1833 /* We use the reloc_count field as a counter if we need
1834 to copy relocs into the output file. */
1835 s->reloc_count = 0;
1836 }
1837 else
1838 {
1839 /* It's not one of our sections, so don't allocate space. */
1840 continue;
1841 }
1842
1843 if (s->_raw_size == 0)
1844 {
1845 /* If we don't need this section, strip it from the
1846 output file. This is mostly to handle .rel.bss and
1847 .rel.plt. We must create both sections in
1848 create_dynamic_sections, because they must be created
1849 before the linker maps input sections to output
1850 sections. The linker does that before
1851 adjust_dynamic_symbol is called, and it is that
1852 function which decides whether anything needs to go
1853 into these sections. */
1854
1855 _bfd_strip_section_from_output (info, s);
1856 continue;
1857 }
1858
1859 /* Allocate memory for the section contents. We use bfd_zalloc
1860 here in case unused entries are not reclaimed before the
1861 section's contents are written out. This should not happen,
1862 but this way if it does, we get a R_386_NONE reloc instead
1863 of garbage. */
1864 s->contents = bfd_zalloc (dynobj, s->_raw_size);
1865 if (s->contents == NULL)
1866 return FALSE;
1867 }
1868
1869 if (htab->elf.dynamic_sections_created)
1870 {
1871 /* Add some entries to the .dynamic section. We fill in the
1872 values later, in elf_i386_finish_dynamic_sections, but we
1873 must add the entries now so that we get the correct size for
1874 the .dynamic section. The DT_DEBUG entry is filled in by the
1875 dynamic linker and used by the debugger. */
1876 #define add_dynamic_entry(TAG, VAL) \
1877 bfd_elf32_add_dynamic_entry (info, (TAG), (VAL))
1878
1879 if (info->executable)
1880 {
1881 if (!add_dynamic_entry (DT_DEBUG, 0))
1882 return FALSE;
1883 }
1884
1885 if (htab->splt->_raw_size != 0)
1886 {
1887 if (!add_dynamic_entry (DT_PLTGOT, 0)
1888 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1889 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1890 || !add_dynamic_entry (DT_JMPREL, 0))
1891 return FALSE;
1892 }
1893
1894 if (relocs)
1895 {
1896 if (!add_dynamic_entry (DT_REL, 0)
1897 || !add_dynamic_entry (DT_RELSZ, 0)
1898 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
1899 return FALSE;
1900
1901 /* If any dynamic relocs apply to a read-only section,
1902 then we need a DT_TEXTREL entry. */
1903 if ((info->flags & DF_TEXTREL) == 0)
1904 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1905 (PTR) info);
1906
1907 if ((info->flags & DF_TEXTREL) != 0)
1908 {
1909 if (!add_dynamic_entry (DT_TEXTREL, 0))
1910 return FALSE;
1911 }
1912 }
1913 }
1914 #undef add_dynamic_entry
1915
1916 return TRUE;
1917 }
1918
1919 /* Set the correct type for an x86 ELF section. We do this by the
1920 section name, which is a hack, but ought to work. */
1921
1922 static bfd_boolean
1923 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1924 Elf_Internal_Shdr *hdr,
1925 asection *sec)
1926 {
1927 register const char *name;
1928
1929 name = bfd_get_section_name (abfd, sec);
1930
1931 /* This is an ugly, but unfortunately necessary hack that is
1932 needed when producing EFI binaries on x86. It tells
1933 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1934 containing ELF relocation info. We need this hack in order to
1935 be able to generate ELF binaries that can be translated into
1936 EFI applications (which are essentially COFF objects). Those
1937 files contain a COFF ".reloc" section inside an ELFNN object,
1938 which would normally cause BFD to segfault because it would
1939 attempt to interpret this section as containing relocation
1940 entries for section "oc". With this hack enabled, ".reloc"
1941 will be treated as a normal data section, which will avoid the
1942 segfault. However, you won't be able to create an ELFNN binary
1943 with a section named "oc" that needs relocations, but that's
1944 the kind of ugly side-effects you get when detecting section
1945 types based on their names... In practice, this limitation is
1946 unlikely to bite. */
1947 if (strcmp (name, ".reloc") == 0)
1948 hdr->sh_type = SHT_PROGBITS;
1949
1950 return TRUE;
1951 }
1952
1953 /* Return the base VMA address which should be subtracted from real addresses
1954 when resolving @dtpoff relocation.
1955 This is PT_TLS segment p_vaddr. */
1956
1957 static bfd_vma
1958 dtpoff_base (struct bfd_link_info *info)
1959 {
1960 /* If tls_sec is NULL, we should have signalled an error already. */
1961 if (elf_hash_table (info)->tls_sec == NULL)
1962 return 0;
1963 return elf_hash_table (info)->tls_sec->vma;
1964 }
1965
1966 /* Return the relocation value for @tpoff relocation
1967 if STT_TLS virtual address is ADDRESS. */
1968
1969 static bfd_vma
1970 tpoff (struct bfd_link_info *info, bfd_vma address)
1971 {
1972 struct elf_link_hash_table *htab = elf_hash_table (info);
1973
1974 /* If tls_sec is NULL, we should have signalled an error already. */
1975 if (htab->tls_sec == NULL)
1976 return 0;
1977 return htab->tls_size + htab->tls_sec->vma - address;
1978 }
1979
1980 /* Relocate an i386 ELF section. */
1981
1982 static bfd_boolean
1983 elf_i386_relocate_section (bfd *output_bfd,
1984 struct bfd_link_info *info,
1985 bfd *input_bfd,
1986 asection *input_section,
1987 bfd_byte *contents,
1988 Elf_Internal_Rela *relocs,
1989 Elf_Internal_Sym *local_syms,
1990 asection **local_sections)
1991 {
1992 struct elf_i386_link_hash_table *htab;
1993 Elf_Internal_Shdr *symtab_hdr;
1994 struct elf_link_hash_entry **sym_hashes;
1995 bfd_vma *local_got_offsets;
1996 Elf_Internal_Rela *rel;
1997 Elf_Internal_Rela *relend;
1998
1999 htab = elf_i386_hash_table (info);
2000 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2001 sym_hashes = elf_sym_hashes (input_bfd);
2002 local_got_offsets = elf_local_got_offsets (input_bfd);
2003
2004 rel = relocs;
2005 relend = relocs + input_section->reloc_count;
2006 for (; rel < relend; rel++)
2007 {
2008 unsigned int r_type;
2009 reloc_howto_type *howto;
2010 unsigned long r_symndx;
2011 struct elf_link_hash_entry *h;
2012 Elf_Internal_Sym *sym;
2013 asection *sec;
2014 bfd_vma off;
2015 bfd_vma relocation;
2016 bfd_boolean unresolved_reloc;
2017 bfd_reloc_status_type r;
2018 unsigned int indx;
2019 int tls_type;
2020
2021 r_type = ELF32_R_TYPE (rel->r_info);
2022 if (r_type == R_386_GNU_VTINHERIT
2023 || r_type == R_386_GNU_VTENTRY)
2024 continue;
2025
2026 if ((indx = r_type) >= R_386_standard
2027 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2028 >= R_386_ext - R_386_standard)
2029 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2030 >= R_386_tls - R_386_ext))
2031 {
2032 bfd_set_error (bfd_error_bad_value);
2033 return FALSE;
2034 }
2035 howto = elf_howto_table + indx;
2036
2037 r_symndx = ELF32_R_SYM (rel->r_info);
2038
2039 if (info->relocatable)
2040 {
2041 bfd_vma val;
2042 bfd_byte *where;
2043
2044 /* This is a relocatable link. We don't have to change
2045 anything, unless the reloc is against a section symbol,
2046 in which case we have to adjust according to where the
2047 section symbol winds up in the output section. */
2048 if (r_symndx >= symtab_hdr->sh_info)
2049 continue;
2050
2051 sym = local_syms + r_symndx;
2052 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2053 continue;
2054
2055 sec = local_sections[r_symndx];
2056 val = sec->output_offset;
2057 if (val == 0)
2058 continue;
2059
2060 where = contents + rel->r_offset;
2061 switch (howto->size)
2062 {
2063 /* FIXME: overflow checks. */
2064 case 0:
2065 val += bfd_get_8 (input_bfd, where);
2066 bfd_put_8 (input_bfd, val, where);
2067 break;
2068 case 1:
2069 val += bfd_get_16 (input_bfd, where);
2070 bfd_put_16 (input_bfd, val, where);
2071 break;
2072 case 2:
2073 val += bfd_get_32 (input_bfd, where);
2074 bfd_put_32 (input_bfd, val, where);
2075 break;
2076 default:
2077 abort ();
2078 }
2079 continue;
2080 }
2081
2082 /* This is a final link. */
2083 h = NULL;
2084 sym = NULL;
2085 sec = NULL;
2086 unresolved_reloc = FALSE;
2087 if (r_symndx < symtab_hdr->sh_info)
2088 {
2089 sym = local_syms + r_symndx;
2090 sec = local_sections[r_symndx];
2091 relocation = (sec->output_section->vma
2092 + sec->output_offset
2093 + sym->st_value);
2094 if ((sec->flags & SEC_MERGE)
2095 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2096 {
2097 asection *msec;
2098 bfd_vma addend;
2099 bfd_byte *where = contents + rel->r_offset;
2100
2101 switch (howto->size)
2102 {
2103 case 0:
2104 addend = bfd_get_8 (input_bfd, where);
2105 if (howto->pc_relative)
2106 {
2107 addend = (addend ^ 0x80) - 0x80;
2108 addend += 1;
2109 }
2110 break;
2111 case 1:
2112 addend = bfd_get_16 (input_bfd, where);
2113 if (howto->pc_relative)
2114 {
2115 addend = (addend ^ 0x8000) - 0x8000;
2116 addend += 2;
2117 }
2118 break;
2119 case 2:
2120 addend = bfd_get_32 (input_bfd, where);
2121 if (howto->pc_relative)
2122 {
2123 addend = (addend ^ 0x80000000) - 0x80000000;
2124 addend += 4;
2125 }
2126 break;
2127 default:
2128 abort ();
2129 }
2130
2131 msec = sec;
2132 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2133 addend -= relocation;
2134 addend += msec->output_section->vma + msec->output_offset;
2135
2136 switch (howto->size)
2137 {
2138 case 0:
2139 /* FIXME: overflow checks. */
2140 if (howto->pc_relative)
2141 addend -= 1;
2142 bfd_put_8 (input_bfd, addend, where);
2143 break;
2144 case 1:
2145 if (howto->pc_relative)
2146 addend -= 2;
2147 bfd_put_16 (input_bfd, addend, where);
2148 break;
2149 case 2:
2150 if (howto->pc_relative)
2151 addend -= 4;
2152 bfd_put_32 (input_bfd, addend, where);
2153 break;
2154 }
2155 }
2156 }
2157 else
2158 {
2159 bfd_boolean warned;
2160
2161 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr, relocation, sec, unresolved_reloc, info, warned);
2162 }
2163
2164 switch (r_type)
2165 {
2166 case R_386_GOT32:
2167 /* Relocation is to the entry for this symbol in the global
2168 offset table. */
2169 if (htab->sgot == NULL)
2170 abort ();
2171
2172 if (h != NULL)
2173 {
2174 bfd_boolean dyn;
2175
2176 off = h->got.offset;
2177 dyn = htab->elf.dynamic_sections_created;
2178 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2179 || (info->shared
2180 && SYMBOL_REFERENCES_LOCAL (info, h))
2181 || (ELF_ST_VISIBILITY (h->other)
2182 && h->root.type == bfd_link_hash_undefweak))
2183 {
2184 /* This is actually a static link, or it is a
2185 -Bsymbolic link and the symbol is defined
2186 locally, or the symbol was forced to be local
2187 because of a version file. We must initialize
2188 this entry in the global offset table. Since the
2189 offset must always be a multiple of 4, we use the
2190 least significant bit to record whether we have
2191 initialized it already.
2192
2193 When doing a dynamic link, we create a .rel.got
2194 relocation entry to initialize the value. This
2195 is done in the finish_dynamic_symbol routine. */
2196 if ((off & 1) != 0)
2197 off &= ~1;
2198 else
2199 {
2200 bfd_put_32 (output_bfd, relocation,
2201 htab->sgot->contents + off);
2202 h->got.offset |= 1;
2203 }
2204 }
2205 else
2206 unresolved_reloc = FALSE;
2207 }
2208 else
2209 {
2210 if (local_got_offsets == NULL)
2211 abort ();
2212
2213 off = local_got_offsets[r_symndx];
2214
2215 /* The offset must always be a multiple of 4. We use
2216 the least significant bit to record whether we have
2217 already generated the necessary reloc. */
2218 if ((off & 1) != 0)
2219 off &= ~1;
2220 else
2221 {
2222 bfd_put_32 (output_bfd, relocation,
2223 htab->sgot->contents + off);
2224
2225 if (info->shared)
2226 {
2227 asection *s;
2228 Elf_Internal_Rela outrel;
2229 bfd_byte *loc;
2230
2231 s = htab->srelgot;
2232 if (s == NULL)
2233 abort ();
2234
2235 outrel.r_offset = (htab->sgot->output_section->vma
2236 + htab->sgot->output_offset
2237 + off);
2238 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2239 loc = s->contents;
2240 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2241 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2242 }
2243
2244 local_got_offsets[r_symndx] |= 1;
2245 }
2246 }
2247
2248 if (off >= (bfd_vma) -2)
2249 abort ();
2250
2251 relocation = htab->sgot->output_offset + off;
2252 break;
2253
2254 case R_386_GOTOFF:
2255 /* Relocation is relative to the start of the global offset
2256 table. */
2257
2258 /* Note that sgot->output_offset is not involved in this
2259 calculation. We always want the start of .got. If we
2260 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2261 permitted by the ABI, we might have to change this
2262 calculation. */
2263 relocation -= htab->sgot->output_section->vma;
2264 break;
2265
2266 case R_386_GOTPC:
2267 /* Use global offset table as symbol value. */
2268 relocation = htab->sgot->output_section->vma;
2269 unresolved_reloc = FALSE;
2270 break;
2271
2272 case R_386_PLT32:
2273 /* Relocation is to the entry for this symbol in the
2274 procedure linkage table. */
2275
2276 /* Resolve a PLT32 reloc against a local symbol directly,
2277 without using the procedure linkage table. */
2278 if (h == NULL)
2279 break;
2280
2281 if (h->plt.offset == (bfd_vma) -1
2282 || htab->splt == NULL)
2283 {
2284 /* We didn't make a PLT entry for this symbol. This
2285 happens when statically linking PIC code, or when
2286 using -Bsymbolic. */
2287 break;
2288 }
2289
2290 relocation = (htab->splt->output_section->vma
2291 + htab->splt->output_offset
2292 + h->plt.offset);
2293 unresolved_reloc = FALSE;
2294 break;
2295
2296 case R_386_32:
2297 case R_386_PC32:
2298 /* r_symndx will be zero only for relocs against symbols
2299 from removed linkonce sections, or sections discarded by
2300 a linker script. */
2301 if (r_symndx == 0
2302 || (input_section->flags & SEC_ALLOC) == 0)
2303 break;
2304
2305 if ((info->shared
2306 && (h == NULL
2307 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2308 || h->root.type != bfd_link_hash_undefweak)
2309 && (r_type != R_386_PC32
2310 || !SYMBOL_CALLS_LOCAL (info, h)))
2311 || (ELIMINATE_COPY_RELOCS
2312 && !info->shared
2313 && h != NULL
2314 && h->dynindx != -1
2315 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2316 && (((h->elf_link_hash_flags
2317 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2318 && (h->elf_link_hash_flags
2319 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2320 || h->root.type == bfd_link_hash_undefweak
2321 || h->root.type == bfd_link_hash_undefined)))
2322 {
2323 Elf_Internal_Rela outrel;
2324 bfd_byte *loc;
2325 bfd_boolean skip, relocate;
2326 asection *sreloc;
2327
2328 /* When generating a shared object, these relocations
2329 are copied into the output file to be resolved at run
2330 time. */
2331
2332 skip = FALSE;
2333 relocate = FALSE;
2334
2335 outrel.r_offset =
2336 _bfd_elf_section_offset (output_bfd, info, input_section,
2337 rel->r_offset);
2338 if (outrel.r_offset == (bfd_vma) -1)
2339 skip = TRUE;
2340 else if (outrel.r_offset == (bfd_vma) -2)
2341 skip = TRUE, relocate = TRUE;
2342 outrel.r_offset += (input_section->output_section->vma
2343 + input_section->output_offset);
2344
2345 if (skip)
2346 memset (&outrel, 0, sizeof outrel);
2347 else if (h != NULL
2348 && h->dynindx != -1
2349 && (r_type == R_386_PC32
2350 || !info->shared
2351 || !info->symbolic
2352 || (h->elf_link_hash_flags
2353 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2354 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2355 else
2356 {
2357 /* This symbol is local, or marked to become local. */
2358 relocate = TRUE;
2359 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2360 }
2361
2362 sreloc = elf_section_data (input_section)->sreloc;
2363 if (sreloc == NULL)
2364 abort ();
2365
2366 loc = sreloc->contents;
2367 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2368 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2369
2370 /* If this reloc is against an external symbol, we do
2371 not want to fiddle with the addend. Otherwise, we
2372 need to include the symbol value so that it becomes
2373 an addend for the dynamic reloc. */
2374 if (! relocate)
2375 continue;
2376 }
2377 break;
2378
2379 case R_386_TLS_IE:
2380 if (info->shared)
2381 {
2382 Elf_Internal_Rela outrel;
2383 bfd_byte *loc;
2384 asection *sreloc;
2385
2386 outrel.r_offset = rel->r_offset
2387 + input_section->output_section->vma
2388 + input_section->output_offset;
2389 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2390 sreloc = elf_section_data (input_section)->sreloc;
2391 if (sreloc == NULL)
2392 abort ();
2393 loc = sreloc->contents;
2394 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2395 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2396 }
2397 /* Fall through */
2398
2399 case R_386_TLS_GD:
2400 case R_386_TLS_IE_32:
2401 case R_386_TLS_GOTIE:
2402 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2403 tls_type = GOT_UNKNOWN;
2404 if (h == NULL && local_got_offsets)
2405 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2406 else if (h != NULL)
2407 {
2408 tls_type = elf_i386_hash_entry(h)->tls_type;
2409 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2410 r_type = R_386_TLS_LE_32;
2411 }
2412 if (tls_type == GOT_TLS_IE)
2413 tls_type = GOT_TLS_IE_NEG;
2414 if (r_type == R_386_TLS_GD)
2415 {
2416 if (tls_type == GOT_TLS_IE_POS)
2417 r_type = R_386_TLS_GOTIE;
2418 else if (tls_type & GOT_TLS_IE)
2419 r_type = R_386_TLS_IE_32;
2420 }
2421
2422 if (r_type == R_386_TLS_LE_32)
2423 {
2424 BFD_ASSERT (! unresolved_reloc);
2425 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2426 {
2427 unsigned int val, type;
2428 bfd_vma roff;
2429
2430 /* GD->LE transition. */
2431 BFD_ASSERT (rel->r_offset >= 2);
2432 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2433 BFD_ASSERT (type == 0x8d || type == 0x04);
2434 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2435 BFD_ASSERT (bfd_get_8 (input_bfd,
2436 contents + rel->r_offset + 4)
2437 == 0xe8);
2438 BFD_ASSERT (rel + 1 < relend);
2439 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2440 roff = rel->r_offset + 5;
2441 val = bfd_get_8 (input_bfd,
2442 contents + rel->r_offset - 1);
2443 if (type == 0x04)
2444 {
2445 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2446 Change it into:
2447 movl %gs:0, %eax; subl $foo@tpoff, %eax
2448 (6 byte form of subl). */
2449 BFD_ASSERT (rel->r_offset >= 3);
2450 BFD_ASSERT (bfd_get_8 (input_bfd,
2451 contents + rel->r_offset - 3)
2452 == 0x8d);
2453 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2454 memcpy (contents + rel->r_offset - 3,
2455 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2456 }
2457 else
2458 {
2459 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2460 if (rel->r_offset + 10 <= input_section->_raw_size
2461 && bfd_get_8 (input_bfd,
2462 contents + rel->r_offset + 9) == 0x90)
2463 {
2464 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2465 Change it into:
2466 movl %gs:0, %eax; subl $foo@tpoff, %eax
2467 (6 byte form of subl). */
2468 memcpy (contents + rel->r_offset - 2,
2469 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2470 roff = rel->r_offset + 6;
2471 }
2472 else
2473 {
2474 /* leal foo(%reg), %eax; call ___tls_get_addr
2475 Change it into:
2476 movl %gs:0, %eax; subl $foo@tpoff, %eax
2477 (5 byte form of subl). */
2478 memcpy (contents + rel->r_offset - 2,
2479 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2480 }
2481 }
2482 bfd_put_32 (output_bfd, tpoff (info, relocation),
2483 contents + roff);
2484 /* Skip R_386_PLT32. */
2485 rel++;
2486 continue;
2487 }
2488 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2489 {
2490 unsigned int val, type;
2491
2492 /* IE->LE transition:
2493 Originally it can be one of:
2494 movl foo, %eax
2495 movl foo, %reg
2496 addl foo, %reg
2497 We change it into:
2498 movl $foo, %eax
2499 movl $foo, %reg
2500 addl $foo, %reg. */
2501 BFD_ASSERT (rel->r_offset >= 1);
2502 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2503 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2504 if (val == 0xa1)
2505 {
2506 /* movl foo, %eax. */
2507 bfd_put_8 (output_bfd, 0xb8,
2508 contents + rel->r_offset - 1);
2509 }
2510 else
2511 {
2512 BFD_ASSERT (rel->r_offset >= 2);
2513 type = bfd_get_8 (input_bfd,
2514 contents + rel->r_offset - 2);
2515 switch (type)
2516 {
2517 case 0x8b:
2518 /* movl */
2519 BFD_ASSERT ((val & 0xc7) == 0x05);
2520 bfd_put_8 (output_bfd, 0xc7,
2521 contents + rel->r_offset - 2);
2522 bfd_put_8 (output_bfd,
2523 0xc0 | ((val >> 3) & 7),
2524 contents + rel->r_offset - 1);
2525 break;
2526 case 0x03:
2527 /* addl */
2528 BFD_ASSERT ((val & 0xc7) == 0x05);
2529 bfd_put_8 (output_bfd, 0x81,
2530 contents + rel->r_offset - 2);
2531 bfd_put_8 (output_bfd,
2532 0xc0 | ((val >> 3) & 7),
2533 contents + rel->r_offset - 1);
2534 break;
2535 default:
2536 BFD_FAIL ();
2537 break;
2538 }
2539 }
2540 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2541 contents + rel->r_offset);
2542 continue;
2543 }
2544 else
2545 {
2546 unsigned int val, type;
2547
2548 /* {IE_32,GOTIE}->LE transition:
2549 Originally it can be one of:
2550 subl foo(%reg1), %reg2
2551 movl foo(%reg1), %reg2
2552 addl foo(%reg1), %reg2
2553 We change it into:
2554 subl $foo, %reg2
2555 movl $foo, %reg2 (6 byte form)
2556 addl $foo, %reg2. */
2557 BFD_ASSERT (rel->r_offset >= 2);
2558 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2559 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2560 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2561 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2562 if (type == 0x8b)
2563 {
2564 /* movl */
2565 bfd_put_8 (output_bfd, 0xc7,
2566 contents + rel->r_offset - 2);
2567 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2568 contents + rel->r_offset - 1);
2569 }
2570 else if (type == 0x2b)
2571 {
2572 /* subl */
2573 bfd_put_8 (output_bfd, 0x81,
2574 contents + rel->r_offset - 2);
2575 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2576 contents + rel->r_offset - 1);
2577 }
2578 else if (type == 0x03)
2579 {
2580 /* addl */
2581 bfd_put_8 (output_bfd, 0x81,
2582 contents + rel->r_offset - 2);
2583 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2584 contents + rel->r_offset - 1);
2585 }
2586 else
2587 BFD_FAIL ();
2588 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2589 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2590 contents + rel->r_offset);
2591 else
2592 bfd_put_32 (output_bfd, tpoff (info, relocation),
2593 contents + rel->r_offset);
2594 continue;
2595 }
2596 }
2597
2598 if (htab->sgot == NULL)
2599 abort ();
2600
2601 if (h != NULL)
2602 off = h->got.offset;
2603 else
2604 {
2605 if (local_got_offsets == NULL)
2606 abort ();
2607
2608 off = local_got_offsets[r_symndx];
2609 }
2610
2611 if ((off & 1) != 0)
2612 off &= ~1;
2613 else
2614 {
2615 Elf_Internal_Rela outrel;
2616 bfd_byte *loc;
2617 int dr_type, indx;
2618
2619 if (htab->srelgot == NULL)
2620 abort ();
2621
2622 outrel.r_offset = (htab->sgot->output_section->vma
2623 + htab->sgot->output_offset + off);
2624
2625 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2626 if (r_type == R_386_TLS_GD)
2627 dr_type = R_386_TLS_DTPMOD32;
2628 else if (tls_type == GOT_TLS_IE_POS)
2629 dr_type = R_386_TLS_TPOFF;
2630 else
2631 dr_type = R_386_TLS_TPOFF32;
2632 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2633 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2634 htab->sgot->contents + off);
2635 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2636 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2637 htab->sgot->contents + off);
2638 else
2639 bfd_put_32 (output_bfd, 0,
2640 htab->sgot->contents + off);
2641 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2642 loc = htab->srelgot->contents;
2643 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2644 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2645
2646 if (r_type == R_386_TLS_GD)
2647 {
2648 if (indx == 0)
2649 {
2650 BFD_ASSERT (! unresolved_reloc);
2651 bfd_put_32 (output_bfd,
2652 relocation - dtpoff_base (info),
2653 htab->sgot->contents + off + 4);
2654 }
2655 else
2656 {
2657 bfd_put_32 (output_bfd, 0,
2658 htab->sgot->contents + off + 4);
2659 outrel.r_info = ELF32_R_INFO (indx,
2660 R_386_TLS_DTPOFF32);
2661 outrel.r_offset += 4;
2662 htab->srelgot->reloc_count++;
2663 loc += sizeof (Elf32_External_Rel);
2664 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2665 }
2666 }
2667 else if (tls_type == GOT_TLS_IE_BOTH)
2668 {
2669 bfd_put_32 (output_bfd,
2670 indx == 0 ? relocation - dtpoff_base (info) : 0,
2671 htab->sgot->contents + off + 4);
2672 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2673 outrel.r_offset += 4;
2674 htab->srelgot->reloc_count++;
2675 loc += sizeof (Elf32_External_Rel);
2676 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2677 }
2678
2679 if (h != NULL)
2680 h->got.offset |= 1;
2681 else
2682 local_got_offsets[r_symndx] |= 1;
2683 }
2684
2685 if (off >= (bfd_vma) -2)
2686 abort ();
2687 if (r_type == ELF32_R_TYPE (rel->r_info))
2688 {
2689 relocation = htab->sgot->output_offset + off;
2690 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2691 && tls_type == GOT_TLS_IE_BOTH)
2692 relocation += 4;
2693 if (r_type == R_386_TLS_IE)
2694 relocation += htab->sgot->output_section->vma;
2695 unresolved_reloc = FALSE;
2696 }
2697 else
2698 {
2699 unsigned int val, type;
2700 bfd_vma roff;
2701
2702 /* GD->IE transition. */
2703 BFD_ASSERT (rel->r_offset >= 2);
2704 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2705 BFD_ASSERT (type == 0x8d || type == 0x04);
2706 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2707 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2708 == 0xe8);
2709 BFD_ASSERT (rel + 1 < relend);
2710 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2711 roff = rel->r_offset - 3;
2712 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2713 if (type == 0x04)
2714 {
2715 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2716 Change it into:
2717 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2718 BFD_ASSERT (rel->r_offset >= 3);
2719 BFD_ASSERT (bfd_get_8 (input_bfd,
2720 contents + rel->r_offset - 3)
2721 == 0x8d);
2722 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2723 val >>= 3;
2724 }
2725 else
2726 {
2727 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2728 Change it into:
2729 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2730 BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size);
2731 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2732 BFD_ASSERT (bfd_get_8 (input_bfd,
2733 contents + rel->r_offset + 9)
2734 == 0x90);
2735 roff = rel->r_offset - 2;
2736 }
2737 memcpy (contents + roff,
2738 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2739 contents[roff + 7] = 0x80 | (val & 7);
2740 /* If foo is used only with foo@gotntpoff(%reg) and
2741 foo@indntpoff, but not with foo@gottpoff(%reg), change
2742 subl $foo@gottpoff(%reg), %eax
2743 into:
2744 addl $foo@gotntpoff(%reg), %eax. */
2745 if (r_type == R_386_TLS_GOTIE)
2746 {
2747 contents[roff + 6] = 0x03;
2748 if (tls_type == GOT_TLS_IE_BOTH)
2749 off += 4;
2750 }
2751 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2752 contents + roff + 8);
2753 /* Skip R_386_PLT32. */
2754 rel++;
2755 continue;
2756 }
2757 break;
2758
2759 case R_386_TLS_LDM:
2760 if (! info->shared)
2761 {
2762 unsigned int val;
2763
2764 /* LD->LE transition:
2765 Ensure it is:
2766 leal foo(%reg), %eax; call ___tls_get_addr.
2767 We change it into:
2768 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2769 BFD_ASSERT (rel->r_offset >= 2);
2770 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2771 == 0x8d);
2772 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2773 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2774 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2775 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2776 == 0xe8);
2777 BFD_ASSERT (rel + 1 < relend);
2778 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2779 memcpy (contents + rel->r_offset - 2,
2780 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2781 /* Skip R_386_PLT32. */
2782 rel++;
2783 continue;
2784 }
2785
2786 if (htab->sgot == NULL)
2787 abort ();
2788
2789 off = htab->tls_ldm_got.offset;
2790 if (off & 1)
2791 off &= ~1;
2792 else
2793 {
2794 Elf_Internal_Rela outrel;
2795 bfd_byte *loc;
2796
2797 if (htab->srelgot == NULL)
2798 abort ();
2799
2800 outrel.r_offset = (htab->sgot->output_section->vma
2801 + htab->sgot->output_offset + off);
2802
2803 bfd_put_32 (output_bfd, 0,
2804 htab->sgot->contents + off);
2805 bfd_put_32 (output_bfd, 0,
2806 htab->sgot->contents + off + 4);
2807 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2808 loc = htab->srelgot->contents;
2809 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2810 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2811 htab->tls_ldm_got.offset |= 1;
2812 }
2813 relocation = htab->sgot->output_offset + off;
2814 unresolved_reloc = FALSE;
2815 break;
2816
2817 case R_386_TLS_LDO_32:
2818 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2819 relocation -= dtpoff_base (info);
2820 else
2821 /* When converting LDO to LE, we must negate. */
2822 relocation = -tpoff (info, relocation);
2823 break;
2824
2825 case R_386_TLS_LE_32:
2826 case R_386_TLS_LE:
2827 if (info->shared)
2828 {
2829 Elf_Internal_Rela outrel;
2830 asection *sreloc;
2831 bfd_byte *loc;
2832 int indx;
2833
2834 outrel.r_offset = rel->r_offset
2835 + input_section->output_section->vma
2836 + input_section->output_offset;
2837 if (h != NULL && h->dynindx != -1)
2838 indx = h->dynindx;
2839 else
2840 indx = 0;
2841 if (r_type == R_386_TLS_LE_32)
2842 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2843 else
2844 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2845 sreloc = elf_section_data (input_section)->sreloc;
2846 if (sreloc == NULL)
2847 abort ();
2848 loc = sreloc->contents;
2849 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2850 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2851 if (indx)
2852 continue;
2853 else if (r_type == R_386_TLS_LE_32)
2854 relocation = dtpoff_base (info) - relocation;
2855 else
2856 relocation -= dtpoff_base (info);
2857 }
2858 else if (r_type == R_386_TLS_LE_32)
2859 relocation = tpoff (info, relocation);
2860 else
2861 relocation = -tpoff (info, relocation);
2862 break;
2863
2864 default:
2865 break;
2866 }
2867
2868 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2869 because such sections are not SEC_ALLOC and thus ld.so will
2870 not process them. */
2871 if (unresolved_reloc
2872 && !((input_section->flags & SEC_DEBUGGING) != 0
2873 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2874 {
2875 (*_bfd_error_handler)
2876 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2877 bfd_archive_filename (input_bfd),
2878 bfd_get_section_name (input_bfd, input_section),
2879 (long) rel->r_offset,
2880 h->root.root.string);
2881 return FALSE;
2882 }
2883
2884 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2885 contents, rel->r_offset,
2886 relocation, 0);
2887
2888 if (r != bfd_reloc_ok)
2889 {
2890 const char *name;
2891
2892 if (h != NULL)
2893 name = h->root.root.string;
2894 else
2895 {
2896 name = bfd_elf_string_from_elf_section (input_bfd,
2897 symtab_hdr->sh_link,
2898 sym->st_name);
2899 if (name == NULL)
2900 return FALSE;
2901 if (*name == '\0')
2902 name = bfd_section_name (input_bfd, sec);
2903 }
2904
2905 if (r == bfd_reloc_overflow)
2906 {
2907 if (! ((*info->callbacks->reloc_overflow)
2908 (info, name, howto->name, 0,
2909 input_bfd, input_section, rel->r_offset)))
2910 return FALSE;
2911 }
2912 else
2913 {
2914 (*_bfd_error_handler)
2915 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
2916 bfd_archive_filename (input_bfd),
2917 bfd_get_section_name (input_bfd, input_section),
2918 (long) rel->r_offset, name, (int) r);
2919 return FALSE;
2920 }
2921 }
2922 }
2923
2924 return TRUE;
2925 }
2926
2927 /* Finish up dynamic symbol handling. We set the contents of various
2928 dynamic sections here. */
2929
2930 static bfd_boolean
2931 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
2932 struct bfd_link_info *info,
2933 struct elf_link_hash_entry *h,
2934 Elf_Internal_Sym *sym)
2935 {
2936 struct elf_i386_link_hash_table *htab;
2937
2938 htab = elf_i386_hash_table (info);
2939
2940 if (h->plt.offset != (bfd_vma) -1)
2941 {
2942 bfd_vma plt_index;
2943 bfd_vma got_offset;
2944 Elf_Internal_Rela rel;
2945 bfd_byte *loc;
2946
2947 /* This symbol has an entry in the procedure linkage table. Set
2948 it up. */
2949
2950 if (h->dynindx == -1
2951 || htab->splt == NULL
2952 || htab->sgotplt == NULL
2953 || htab->srelplt == NULL)
2954 abort ();
2955
2956 /* Get the index in the procedure linkage table which
2957 corresponds to this symbol. This is the index of this symbol
2958 in all the symbols for which we are making plt entries. The
2959 first entry in the procedure linkage table is reserved. */
2960 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2961
2962 /* Get the offset into the .got table of the entry that
2963 corresponds to this function. Each .got entry is 4 bytes.
2964 The first three are reserved. */
2965 got_offset = (plt_index + 3) * 4;
2966
2967 /* Fill in the entry in the procedure linkage table. */
2968 if (! info->shared)
2969 {
2970 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
2971 PLT_ENTRY_SIZE);
2972 bfd_put_32 (output_bfd,
2973 (htab->sgotplt->output_section->vma
2974 + htab->sgotplt->output_offset
2975 + got_offset),
2976 htab->splt->contents + h->plt.offset + 2);
2977 }
2978 else
2979 {
2980 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
2981 PLT_ENTRY_SIZE);
2982 bfd_put_32 (output_bfd, got_offset,
2983 htab->splt->contents + h->plt.offset + 2);
2984 }
2985
2986 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
2987 htab->splt->contents + h->plt.offset + 7);
2988 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
2989 htab->splt->contents + h->plt.offset + 12);
2990
2991 /* Fill in the entry in the global offset table. */
2992 bfd_put_32 (output_bfd,
2993 (htab->splt->output_section->vma
2994 + htab->splt->output_offset
2995 + h->plt.offset
2996 + 6),
2997 htab->sgotplt->contents + got_offset);
2998
2999 /* Fill in the entry in the .rel.plt section. */
3000 rel.r_offset = (htab->sgotplt->output_section->vma
3001 + htab->sgotplt->output_offset
3002 + got_offset);
3003 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3004 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3005 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3006
3007 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3008 {
3009 /* Mark the symbol as undefined, rather than as defined in
3010 the .plt section. Leave the value if there were any
3011 relocations where pointer equality matters (this is a clue
3012 for the dynamic linker, to make function pointer
3013 comparisons work between an application and shared
3014 library), otherwise set it to zero. If a function is only
3015 called from a binary, there is no need to slow down
3016 shared libraries because of that. */
3017 sym->st_shndx = SHN_UNDEF;
3018 if ((h->elf_link_hash_flags & ELF_LINK_POINTER_EQUALITY_NEEDED) == 0)
3019 sym->st_value = 0;
3020 }
3021 }
3022
3023 if (h->got.offset != (bfd_vma) -1
3024 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3025 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3026 {
3027 Elf_Internal_Rela rel;
3028 bfd_byte *loc;
3029
3030 /* This symbol has an entry in the global offset table. Set it
3031 up. */
3032
3033 if (htab->sgot == NULL || htab->srelgot == NULL)
3034 abort ();
3035
3036 rel.r_offset = (htab->sgot->output_section->vma
3037 + htab->sgot->output_offset
3038 + (h->got.offset & ~(bfd_vma) 1));
3039
3040 /* If this is a static link, or it is a -Bsymbolic link and the
3041 symbol is defined locally or was forced to be local because
3042 of a version file, we just want to emit a RELATIVE reloc.
3043 The entry in the global offset table will already have been
3044 initialized in the relocate_section function. */
3045 if (info->shared
3046 && SYMBOL_REFERENCES_LOCAL (info, h))
3047 {
3048 BFD_ASSERT((h->got.offset & 1) != 0);
3049 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3050 }
3051 else
3052 {
3053 BFD_ASSERT((h->got.offset & 1) == 0);
3054 bfd_put_32 (output_bfd, (bfd_vma) 0,
3055 htab->sgot->contents + h->got.offset);
3056 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3057 }
3058
3059 loc = htab->srelgot->contents;
3060 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3061 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3062 }
3063
3064 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3065 {
3066 Elf_Internal_Rela rel;
3067 bfd_byte *loc;
3068
3069 /* This symbol needs a copy reloc. Set it up. */
3070
3071 if (h->dynindx == -1
3072 || (h->root.type != bfd_link_hash_defined
3073 && h->root.type != bfd_link_hash_defweak)
3074 || htab->srelbss == NULL)
3075 abort ();
3076
3077 rel.r_offset = (h->root.u.def.value
3078 + h->root.u.def.section->output_section->vma
3079 + h->root.u.def.section->output_offset);
3080 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3081 loc = htab->srelbss->contents;
3082 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3083 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3084 }
3085
3086 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3087 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3088 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3089 sym->st_shndx = SHN_ABS;
3090
3091 return TRUE;
3092 }
3093
3094 /* Used to decide how to sort relocs in an optimal manner for the
3095 dynamic linker, before writing them out. */
3096
3097 static enum elf_reloc_type_class
3098 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3099 {
3100 switch (ELF32_R_TYPE (rela->r_info))
3101 {
3102 case R_386_RELATIVE:
3103 return reloc_class_relative;
3104 case R_386_JUMP_SLOT:
3105 return reloc_class_plt;
3106 case R_386_COPY:
3107 return reloc_class_copy;
3108 default:
3109 return reloc_class_normal;
3110 }
3111 }
3112
3113 /* Finish up the dynamic sections. */
3114
3115 static bfd_boolean
3116 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3117 struct bfd_link_info *info)
3118 {
3119 struct elf_i386_link_hash_table *htab;
3120 bfd *dynobj;
3121 asection *sdyn;
3122
3123 htab = elf_i386_hash_table (info);
3124 dynobj = htab->elf.dynobj;
3125 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3126
3127 if (htab->elf.dynamic_sections_created)
3128 {
3129 Elf32_External_Dyn *dyncon, *dynconend;
3130
3131 if (sdyn == NULL || htab->sgot == NULL)
3132 abort ();
3133
3134 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3135 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3136 for (; dyncon < dynconend; dyncon++)
3137 {
3138 Elf_Internal_Dyn dyn;
3139 asection *s;
3140
3141 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3142
3143 switch (dyn.d_tag)
3144 {
3145 default:
3146 continue;
3147
3148 case DT_PLTGOT:
3149 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3150 break;
3151
3152 case DT_JMPREL:
3153 s = htab->srelplt;
3154 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3155 break;
3156
3157 case DT_PLTRELSZ:
3158 s = htab->srelplt;
3159 dyn.d_un.d_val = s->_raw_size;
3160 break;
3161
3162 case DT_RELSZ:
3163 /* My reading of the SVR4 ABI indicates that the
3164 procedure linkage table relocs (DT_JMPREL) should be
3165 included in the overall relocs (DT_REL). This is
3166 what Solaris does. However, UnixWare can not handle
3167 that case. Therefore, we override the DT_RELSZ entry
3168 here to make it not include the JMPREL relocs. */
3169 s = htab->srelplt;
3170 if (s == NULL)
3171 continue;
3172 dyn.d_un.d_val -= s->_raw_size;
3173 break;
3174
3175 case DT_REL:
3176 /* We may not be using the standard ELF linker script.
3177 If .rel.plt is the first .rel section, we adjust
3178 DT_REL to not include it. */
3179 s = htab->srelplt;
3180 if (s == NULL)
3181 continue;
3182 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3183 continue;
3184 dyn.d_un.d_ptr += s->_raw_size;
3185 break;
3186 }
3187
3188 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3189 }
3190
3191 /* Fill in the first entry in the procedure linkage table. */
3192 if (htab->splt && htab->splt->_raw_size > 0)
3193 {
3194 if (info->shared)
3195 memcpy (htab->splt->contents,
3196 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
3197 else
3198 {
3199 memcpy (htab->splt->contents,
3200 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
3201 bfd_put_32 (output_bfd,
3202 (htab->sgotplt->output_section->vma
3203 + htab->sgotplt->output_offset
3204 + 4),
3205 htab->splt->contents + 2);
3206 bfd_put_32 (output_bfd,
3207 (htab->sgotplt->output_section->vma
3208 + htab->sgotplt->output_offset
3209 + 8),
3210 htab->splt->contents + 8);
3211 }
3212
3213 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3214 really seem like the right value. */
3215 elf_section_data (htab->splt->output_section)
3216 ->this_hdr.sh_entsize = 4;
3217 }
3218 }
3219
3220 if (htab->sgotplt)
3221 {
3222 /* Fill in the first three entries in the global offset table. */
3223 if (htab->sgotplt->_raw_size > 0)
3224 {
3225 bfd_put_32 (output_bfd,
3226 (sdyn == NULL ? 0
3227 : sdyn->output_section->vma + sdyn->output_offset),
3228 htab->sgotplt->contents);
3229 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3230 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3231 }
3232
3233 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3234 }
3235 return TRUE;
3236 }
3237
3238 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3239 #define TARGET_LITTLE_NAME "elf32-i386"
3240 #define ELF_ARCH bfd_arch_i386
3241 #define ELF_MACHINE_CODE EM_386
3242 #define ELF_MAXPAGESIZE 0x1000
3243
3244 #define elf_backend_can_gc_sections 1
3245 #define elf_backend_can_refcount 1
3246 #define elf_backend_want_got_plt 1
3247 #define elf_backend_plt_readonly 1
3248 #define elf_backend_want_plt_sym 0
3249 #define elf_backend_got_header_size 12
3250
3251 /* Support RELA for objdump of prelink objects. */
3252 #define elf_info_to_howto elf_i386_info_to_howto_rel
3253 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3254
3255 #define bfd_elf32_mkobject elf_i386_mkobject
3256 #define elf_backend_object_p elf_i386_object_p
3257
3258 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3259 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3260 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3261
3262 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3263 #define elf_backend_check_relocs elf_i386_check_relocs
3264 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3265 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3266 #define elf_backend_fake_sections elf_i386_fake_sections
3267 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3268 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3269 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3270 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3271 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3272 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3273 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3274 #define elf_backend_relocate_section elf_i386_relocate_section
3275 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3276
3277 #include "elf32-target.h"
3278
3279 /* FreeBSD support. */
3280
3281 #undef TARGET_LITTLE_SYM
3282 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3283 #undef TARGET_LITTLE_NAME
3284 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3285
3286 /* The kernel recognizes executables as valid only if they carry a
3287 "FreeBSD" label in the ELF header. So we put this label on all
3288 executables and (for simplicity) also all other object files. */
3289
3290 static void
3291 elf_i386_post_process_headers (bfd *abfd,
3292 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3293 {
3294 Elf_Internal_Ehdr *i_ehdrp;
3295
3296 i_ehdrp = elf_elfheader (abfd);
3297
3298 /* Put an ABI label supported by FreeBSD >= 4.1. */
3299 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3300 #ifdef OLD_FREEBSD_ABI_LABEL
3301 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3302 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3303 #endif
3304 }
3305
3306 #undef elf_backend_post_process_headers
3307 #define elf_backend_post_process_headers elf_i386_post_process_headers
3308 #undef elf32_bed
3309 #define elf32_bed elf32_i386_fbsd_bed
3310
3311 #include "elf32-target.h"
GDB Binutils - Deliverables
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