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Add support for FreeBSD cores
[thirdparty/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, 2004
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
350 static bfd_boolean
351 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
352 {
353 int offset;
354 size_t raw_size;
355
356 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
357 {
358 int pr_version = bfd_get_32 (abfd, note->descdata);
359
360 if (pr_version != 1)
361 return FALSE;
362
363 /* pr_cursig */
364 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
365
366 /* pr_pid */
367 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
368
369 /* pr_reg */
370 offset = 28;
371 raw_size = bfd_get_32 (abfd, note->descdata + 8);
372 }
373 else
374 {
375 switch (note->descsz)
376 {
377 default:
378 return FALSE;
379
380 case 144: /* Linux/i386 */
381 /* pr_cursig */
382 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
383
384 /* pr_pid */
385 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
386
387 /* pr_reg */
388 offset = 72;
389 raw_size = 68;
390
391 break;
392 }
393 }
394
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
397 raw_size, note->descpos + offset);
398 }
399
400 static bfd_boolean
401 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
402 {
403 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
404 {
405 int pr_version = bfd_get_32 (abfd, note->descdata);
406
407 if (pr_version != 1)
408 return FALSE;
409
410 elf_tdata (abfd)->core_program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
412 elf_tdata (abfd)->core_command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
414 }
415 else
416 {
417 switch (note->descsz)
418 {
419 default:
420 return FALSE;
421
422 case 124: /* Linux/i386 elf_prpsinfo. */
423 elf_tdata (abfd)->core_program
424 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
425 elf_tdata (abfd)->core_command
426 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
427 }
428 }
429
430 /* Note that for some reason, a spurious space is tacked
431 onto the end of the args in some (at least one anyway)
432 implementations, so strip it off if it exists. */
433 {
434 char *command = elf_tdata (abfd)->core_command;
435 int n = strlen (command);
436
437 if (0 < n && command[n - 1] == ' ')
438 command[n - 1] = '\0';
439 }
440
441 return TRUE;
442 }
443 \f
444 /* Functions for the i386 ELF linker.
445
446 In order to gain some understanding of code in this file without
447 knowing all the intricate details of the linker, note the
448 following:
449
450 Functions named elf_i386_* are called by external routines, other
451 functions are only called locally. elf_i386_* functions appear
452 in this file more or less in the order in which they are called
453 from external routines. eg. elf_i386_check_relocs is called
454 early in the link process, elf_i386_finish_dynamic_sections is
455 one of the last functions. */
456
457
458 /* The name of the dynamic interpreter. This is put in the .interp
459 section. */
460
461 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
462
463 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
464 copying dynamic variables from a shared lib into an app's dynbss
465 section, and instead use a dynamic relocation to point into the
466 shared lib. */
467 #define ELIMINATE_COPY_RELOCS 1
468
469 /* The size in bytes of an entry in the procedure linkage table. */
470
471 #define PLT_ENTRY_SIZE 16
472
473 /* The first entry in an absolute procedure linkage table looks like
474 this. See the SVR4 ABI i386 supplement to see how this works. */
475
476 static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] =
477 {
478 0xff, 0x35, /* pushl contents of address */
479 0, 0, 0, 0, /* replaced with address of .got + 4. */
480 0xff, 0x25, /* jmp indirect */
481 0, 0, 0, 0, /* replaced with address of .got + 8. */
482 0, 0, 0, 0 /* pad out to 16 bytes. */
483 };
484
485 /* Subsequent entries in an absolute procedure linkage table look like
486 this. */
487
488 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
489 {
490 0xff, 0x25, /* jmp indirect */
491 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
492 0x68, /* pushl immediate */
493 0, 0, 0, 0, /* replaced with offset into relocation table. */
494 0xe9, /* jmp relative */
495 0, 0, 0, 0 /* replaced with offset to start of .plt. */
496 };
497
498 /* The first entry in a PIC procedure linkage table look like this. */
499
500 static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] =
501 {
502 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
503 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
504 0, 0, 0, 0 /* pad out to 16 bytes. */
505 };
506
507 /* Subsequent entries in a PIC procedure linkage table look like this. */
508
509 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
510 {
511 0xff, 0xa3, /* jmp *offset(%ebx) */
512 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
513 0x68, /* pushl immediate */
514 0, 0, 0, 0, /* replaced with offset into relocation table. */
515 0xe9, /* jmp relative */
516 0, 0, 0, 0 /* replaced with offset to start of .plt. */
517 };
518
519 /* The i386 linker needs to keep track of the number of relocs that it
520 decides to copy as dynamic relocs in check_relocs for each symbol.
521 This is so that it can later discard them if they are found to be
522 unnecessary. We store the information in a field extending the
523 regular ELF linker hash table. */
524
525 struct elf_i386_dyn_relocs
526 {
527 struct elf_i386_dyn_relocs *next;
528
529 /* The input section of the reloc. */
530 asection *sec;
531
532 /* Total number of relocs copied for the input section. */
533 bfd_size_type count;
534
535 /* Number of pc-relative relocs copied for the input section. */
536 bfd_size_type pc_count;
537 };
538
539 /* i386 ELF linker hash entry. */
540
541 struct elf_i386_link_hash_entry
542 {
543 struct elf_link_hash_entry elf;
544
545 /* Track dynamic relocs copied for this symbol. */
546 struct elf_i386_dyn_relocs *dyn_relocs;
547
548 #define GOT_UNKNOWN 0
549 #define GOT_NORMAL 1
550 #define GOT_TLS_GD 2
551 #define GOT_TLS_IE 4
552 #define GOT_TLS_IE_POS 5
553 #define GOT_TLS_IE_NEG 6
554 #define GOT_TLS_IE_BOTH 7
555 unsigned char tls_type;
556 };
557
558 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
559
560 struct elf_i386_obj_tdata
561 {
562 struct elf_obj_tdata root;
563
564 /* tls_type for each local got entry. */
565 char *local_got_tls_type;
566 };
567
568 #define elf_i386_tdata(abfd) \
569 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
570
571 #define elf_i386_local_got_tls_type(abfd) \
572 (elf_i386_tdata (abfd)->local_got_tls_type)
573
574 static bfd_boolean
575 elf_i386_mkobject (bfd *abfd)
576 {
577 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
578 abfd->tdata.any = bfd_zalloc (abfd, amt);
579 if (abfd->tdata.any == NULL)
580 return FALSE;
581 return TRUE;
582 }
583
584 /* i386 ELF linker hash table. */
585
586 struct elf_i386_link_hash_table
587 {
588 struct elf_link_hash_table elf;
589
590 /* Short-cuts to get to dynamic linker sections. */
591 asection *sgot;
592 asection *sgotplt;
593 asection *srelgot;
594 asection *splt;
595 asection *srelplt;
596 asection *sdynbss;
597 asection *srelbss;
598
599 union {
600 bfd_signed_vma refcount;
601 bfd_vma offset;
602 } tls_ldm_got;
603
604 /* Small local sym to section mapping cache. */
605 struct sym_sec_cache sym_sec;
606 };
607
608 /* Get the i386 ELF linker hash table from a link_info structure. */
609
610 #define elf_i386_hash_table(p) \
611 ((struct elf_i386_link_hash_table *) ((p)->hash))
612
613 /* Create an entry in an i386 ELF linker hash table. */
614
615 static struct bfd_hash_entry *
616 link_hash_newfunc (struct bfd_hash_entry *entry,
617 struct bfd_hash_table *table,
618 const char *string)
619 {
620 /* Allocate the structure if it has not already been allocated by a
621 subclass. */
622 if (entry == NULL)
623 {
624 entry = bfd_hash_allocate (table,
625 sizeof (struct elf_i386_link_hash_entry));
626 if (entry == NULL)
627 return entry;
628 }
629
630 /* Call the allocation method of the superclass. */
631 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
632 if (entry != NULL)
633 {
634 struct elf_i386_link_hash_entry *eh;
635
636 eh = (struct elf_i386_link_hash_entry *) entry;
637 eh->dyn_relocs = NULL;
638 eh->tls_type = GOT_UNKNOWN;
639 }
640
641 return entry;
642 }
643
644 /* Create an i386 ELF linker hash table. */
645
646 static struct bfd_link_hash_table *
647 elf_i386_link_hash_table_create (bfd *abfd)
648 {
649 struct elf_i386_link_hash_table *ret;
650 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
651
652 ret = bfd_malloc (amt);
653 if (ret == NULL)
654 return NULL;
655
656 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
657 {
658 free (ret);
659 return NULL;
660 }
661
662 ret->sgot = NULL;
663 ret->sgotplt = NULL;
664 ret->srelgot = NULL;
665 ret->splt = NULL;
666 ret->srelplt = NULL;
667 ret->sdynbss = NULL;
668 ret->srelbss = NULL;
669 ret->tls_ldm_got.refcount = 0;
670 ret->sym_sec.abfd = NULL;
671
672 return &ret->elf.root;
673 }
674
675 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
676 shortcuts to them in our hash table. */
677
678 static bfd_boolean
679 create_got_section (bfd *dynobj, struct bfd_link_info *info)
680 {
681 struct elf_i386_link_hash_table *htab;
682
683 if (! _bfd_elf_create_got_section (dynobj, info))
684 return FALSE;
685
686 htab = elf_i386_hash_table (info);
687 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
688 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
689 if (!htab->sgot || !htab->sgotplt)
690 abort ();
691
692 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
693 if (htab->srelgot == NULL
694 || ! bfd_set_section_flags (dynobj, htab->srelgot,
695 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
696 | SEC_IN_MEMORY | SEC_LINKER_CREATED
697 | SEC_READONLY))
698 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
699 return FALSE;
700 return TRUE;
701 }
702
703 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
704 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
705 hash table. */
706
707 static bfd_boolean
708 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
709 {
710 struct elf_i386_link_hash_table *htab;
711
712 htab = elf_i386_hash_table (info);
713 if (!htab->sgot && !create_got_section (dynobj, info))
714 return FALSE;
715
716 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
717 return FALSE;
718
719 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
720 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
721 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
722 if (!info->shared)
723 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
724
725 if (!htab->splt || !htab->srelplt || !htab->sdynbss
726 || (!info->shared && !htab->srelbss))
727 abort ();
728
729 return TRUE;
730 }
731
732 /* Copy the extra info we tack onto an elf_link_hash_entry. */
733
734 static void
735 elf_i386_copy_indirect_symbol (const struct elf_backend_data *bed,
736 struct elf_link_hash_entry *dir,
737 struct elf_link_hash_entry *ind)
738 {
739 struct elf_i386_link_hash_entry *edir, *eind;
740
741 edir = (struct elf_i386_link_hash_entry *) dir;
742 eind = (struct elf_i386_link_hash_entry *) ind;
743
744 if (eind->dyn_relocs != NULL)
745 {
746 if (edir->dyn_relocs != NULL)
747 {
748 struct elf_i386_dyn_relocs **pp;
749 struct elf_i386_dyn_relocs *p;
750
751 if (ind->root.type == bfd_link_hash_indirect)
752 abort ();
753
754 /* Add reloc counts against the weak sym to the strong sym
755 list. Merge any entries against the same section. */
756 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
757 {
758 struct elf_i386_dyn_relocs *q;
759
760 for (q = edir->dyn_relocs; q != NULL; q = q->next)
761 if (q->sec == p->sec)
762 {
763 q->pc_count += p->pc_count;
764 q->count += p->count;
765 *pp = p->next;
766 break;
767 }
768 if (q == NULL)
769 pp = &p->next;
770 }
771 *pp = edir->dyn_relocs;
772 }
773
774 edir->dyn_relocs = eind->dyn_relocs;
775 eind->dyn_relocs = NULL;
776 }
777
778 if (ind->root.type == bfd_link_hash_indirect
779 && dir->got.refcount <= 0)
780 {
781 edir->tls_type = eind->tls_type;
782 eind->tls_type = GOT_UNKNOWN;
783 }
784
785 if (ELIMINATE_COPY_RELOCS
786 && ind->root.type != bfd_link_hash_indirect
787 && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
788 /* If called to transfer flags for a weakdef during processing
789 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
790 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
791 dir->elf_link_hash_flags |=
792 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC
793 | ELF_LINK_HASH_REF_REGULAR
794 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
795 | ELF_LINK_HASH_NEEDS_PLT
796 | ELF_LINK_POINTER_EQUALITY_NEEDED));
797 else
798 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
799 }
800
801 static int
802 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
803 {
804 if (info->shared)
805 return r_type;
806
807 switch (r_type)
808 {
809 case R_386_TLS_GD:
810 case R_386_TLS_IE_32:
811 if (is_local)
812 return R_386_TLS_LE_32;
813 return R_386_TLS_IE_32;
814 case R_386_TLS_IE:
815 case R_386_TLS_GOTIE:
816 if (is_local)
817 return R_386_TLS_LE_32;
818 return r_type;
819 case R_386_TLS_LDM:
820 return R_386_TLS_LE_32;
821 }
822
823 return r_type;
824 }
825
826 /* Look through the relocs for a section during the first phase, and
827 calculate needed space in the global offset table, procedure linkage
828 table, and dynamic reloc sections. */
829
830 static bfd_boolean
831 elf_i386_check_relocs (bfd *abfd,
832 struct bfd_link_info *info,
833 asection *sec,
834 const Elf_Internal_Rela *relocs)
835 {
836 struct elf_i386_link_hash_table *htab;
837 Elf_Internal_Shdr *symtab_hdr;
838 struct elf_link_hash_entry **sym_hashes;
839 const Elf_Internal_Rela *rel;
840 const Elf_Internal_Rela *rel_end;
841 asection *sreloc;
842
843 if (info->relocatable)
844 return TRUE;
845
846 htab = elf_i386_hash_table (info);
847 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
848 sym_hashes = elf_sym_hashes (abfd);
849
850 sreloc = NULL;
851
852 rel_end = relocs + sec->reloc_count;
853 for (rel = relocs; rel < rel_end; rel++)
854 {
855 unsigned int r_type;
856 unsigned long r_symndx;
857 struct elf_link_hash_entry *h;
858
859 r_symndx = ELF32_R_SYM (rel->r_info);
860 r_type = ELF32_R_TYPE (rel->r_info);
861
862 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
863 {
864 (*_bfd_error_handler) (_("%s: bad symbol index: %d"),
865 bfd_archive_filename (abfd),
866 r_symndx);
867 return FALSE;
868 }
869
870 if (r_symndx < symtab_hdr->sh_info)
871 h = NULL;
872 else
873 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
874
875 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
876
877 switch (r_type)
878 {
879 case R_386_TLS_LDM:
880 htab->tls_ldm_got.refcount += 1;
881 goto create_got;
882
883 case R_386_PLT32:
884 /* This symbol requires a procedure linkage table entry. We
885 actually build the entry in adjust_dynamic_symbol,
886 because this might be a case of linking PIC code which is
887 never referenced by a dynamic object, in which case we
888 don't need to generate a procedure linkage table entry
889 after all. */
890
891 /* If this is a local symbol, we resolve it directly without
892 creating a procedure linkage table entry. */
893 if (h == NULL)
894 continue;
895
896 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
897 h->plt.refcount += 1;
898 break;
899
900 case R_386_TLS_IE_32:
901 case R_386_TLS_IE:
902 case R_386_TLS_GOTIE:
903 if (info->shared)
904 info->flags |= DF_STATIC_TLS;
905 /* Fall through */
906
907 case R_386_GOT32:
908 case R_386_TLS_GD:
909 /* This symbol requires a global offset table entry. */
910 {
911 int tls_type, old_tls_type;
912
913 switch (r_type)
914 {
915 default:
916 case R_386_GOT32: tls_type = GOT_NORMAL; break;
917 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
918 case R_386_TLS_IE_32:
919 if (ELF32_R_TYPE (rel->r_info) == r_type)
920 tls_type = GOT_TLS_IE_NEG;
921 else
922 /* If this is a GD->IE transition, we may use either of
923 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
924 tls_type = GOT_TLS_IE;
925 break;
926 case R_386_TLS_IE:
927 case R_386_TLS_GOTIE:
928 tls_type = GOT_TLS_IE_POS; break;
929 }
930
931 if (h != NULL)
932 {
933 h->got.refcount += 1;
934 old_tls_type = elf_i386_hash_entry(h)->tls_type;
935 }
936 else
937 {
938 bfd_signed_vma *local_got_refcounts;
939
940 /* This is a global offset table entry for a local symbol. */
941 local_got_refcounts = elf_local_got_refcounts (abfd);
942 if (local_got_refcounts == NULL)
943 {
944 bfd_size_type size;
945
946 size = symtab_hdr->sh_info;
947 size *= (sizeof (bfd_signed_vma) + sizeof(char));
948 local_got_refcounts = bfd_zalloc (abfd, size);
949 if (local_got_refcounts == NULL)
950 return FALSE;
951 elf_local_got_refcounts (abfd) = local_got_refcounts;
952 elf_i386_local_got_tls_type (abfd)
953 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
954 }
955 local_got_refcounts[r_symndx] += 1;
956 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
957 }
958
959 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
960 tls_type |= old_tls_type;
961 /* If a TLS symbol is accessed using IE at least once,
962 there is no point to use dynamic model for it. */
963 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
964 && (old_tls_type != GOT_TLS_GD
965 || (tls_type & GOT_TLS_IE) == 0))
966 {
967 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
968 tls_type = old_tls_type;
969 else
970 {
971 (*_bfd_error_handler)
972 (_("%s: `%s' accessed both as normal and "
973 "thread local symbol"),
974 bfd_archive_filename (abfd),
975 h ? h->root.root.string : "<local>");
976 return FALSE;
977 }
978 }
979
980 if (old_tls_type != tls_type)
981 {
982 if (h != NULL)
983 elf_i386_hash_entry (h)->tls_type = tls_type;
984 else
985 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
986 }
987 }
988 /* Fall through */
989
990 case R_386_GOTOFF:
991 case R_386_GOTPC:
992 create_got:
993 if (htab->sgot == NULL)
994 {
995 if (htab->elf.dynobj == NULL)
996 htab->elf.dynobj = abfd;
997 if (!create_got_section (htab->elf.dynobj, info))
998 return FALSE;
999 }
1000 if (r_type != R_386_TLS_IE)
1001 break;
1002 /* Fall through */
1003
1004 case R_386_TLS_LE_32:
1005 case R_386_TLS_LE:
1006 if (!info->shared)
1007 break;
1008 info->flags |= DF_STATIC_TLS;
1009 /* Fall through */
1010
1011 case R_386_32:
1012 case R_386_PC32:
1013 if (h != NULL && !info->shared)
1014 {
1015 /* If this reloc is in a read-only section, we might
1016 need a copy reloc. We can't check reliably at this
1017 stage whether the section is read-only, as input
1018 sections have not yet been mapped to output sections.
1019 Tentatively set the flag for now, and correct in
1020 adjust_dynamic_symbol. */
1021 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
1022
1023 /* We may need a .plt entry if the function this reloc
1024 refers to is in a shared lib. */
1025 h->plt.refcount += 1;
1026 if (r_type != R_386_PC32)
1027 h->elf_link_hash_flags |= ELF_LINK_POINTER_EQUALITY_NEEDED;
1028 }
1029
1030 /* If we are creating a shared library, and this is a reloc
1031 against a global symbol, or a non PC relative reloc
1032 against a local symbol, then we need to copy the reloc
1033 into the shared library. However, if we are linking with
1034 -Bsymbolic, we do not need to copy a reloc against a
1035 global symbol which is defined in an object we are
1036 including in the link (i.e., DEF_REGULAR is set). At
1037 this point we have not seen all the input files, so it is
1038 possible that DEF_REGULAR is not set now but will be set
1039 later (it is never cleared). In case of a weak definition,
1040 DEF_REGULAR may be cleared later by a strong definition in
1041 a shared library. We account for that possibility below by
1042 storing information in the relocs_copied field of the hash
1043 table entry. A similar situation occurs when creating
1044 shared libraries and symbol visibility changes render the
1045 symbol local.
1046
1047 If on the other hand, we are creating an executable, we
1048 may need to keep relocations for symbols satisfied by a
1049 dynamic library if we manage to avoid copy relocs for the
1050 symbol. */
1051 if ((info->shared
1052 && (sec->flags & SEC_ALLOC) != 0
1053 && (r_type != R_386_PC32
1054 || (h != NULL
1055 && (! info->symbolic
1056 || h->root.type == bfd_link_hash_defweak
1057 || (h->elf_link_hash_flags
1058 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1059 || (ELIMINATE_COPY_RELOCS
1060 && !info->shared
1061 && (sec->flags & SEC_ALLOC) != 0
1062 && h != NULL
1063 && (h->root.type == bfd_link_hash_defweak
1064 || (h->elf_link_hash_flags
1065 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1066 {
1067 struct elf_i386_dyn_relocs *p;
1068 struct elf_i386_dyn_relocs **head;
1069
1070 /* We must copy these reloc types into the output file.
1071 Create a reloc section in dynobj and make room for
1072 this reloc. */
1073 if (sreloc == NULL)
1074 {
1075 const char *name;
1076 bfd *dynobj;
1077 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1078 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1079
1080 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1081 if (name == NULL)
1082 return FALSE;
1083
1084 if (strncmp (name, ".rel", 4) != 0
1085 || strcmp (bfd_get_section_name (abfd, sec),
1086 name + 4) != 0)
1087 {
1088 (*_bfd_error_handler)
1089 (_("%s: bad relocation section name `%s\'"),
1090 bfd_archive_filename (abfd), name);
1091 }
1092
1093 if (htab->elf.dynobj == NULL)
1094 htab->elf.dynobj = abfd;
1095
1096 dynobj = htab->elf.dynobj;
1097 sreloc = bfd_get_section_by_name (dynobj, name);
1098 if (sreloc == NULL)
1099 {
1100 flagword flags;
1101
1102 sreloc = bfd_make_section (dynobj, name);
1103 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1104 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1105 if ((sec->flags & SEC_ALLOC) != 0)
1106 flags |= SEC_ALLOC | SEC_LOAD;
1107 if (sreloc == NULL
1108 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1109 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1110 return FALSE;
1111 }
1112 elf_section_data (sec)->sreloc = sreloc;
1113 }
1114
1115 /* If this is a global symbol, we count the number of
1116 relocations we need for this symbol. */
1117 if (h != NULL)
1118 {
1119 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1120 }
1121 else
1122 {
1123 /* Track dynamic relocs needed for local syms too.
1124 We really need local syms available to do this
1125 easily. Oh well. */
1126
1127 asection *s;
1128 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1129 sec, r_symndx);
1130 if (s == NULL)
1131 return FALSE;
1132
1133 head = ((struct elf_i386_dyn_relocs **)
1134 &elf_section_data (s)->local_dynrel);
1135 }
1136
1137 p = *head;
1138 if (p == NULL || p->sec != sec)
1139 {
1140 bfd_size_type amt = sizeof *p;
1141 p = bfd_alloc (htab->elf.dynobj, amt);
1142 if (p == NULL)
1143 return FALSE;
1144 p->next = *head;
1145 *head = p;
1146 p->sec = sec;
1147 p->count = 0;
1148 p->pc_count = 0;
1149 }
1150
1151 p->count += 1;
1152 if (r_type == R_386_PC32)
1153 p->pc_count += 1;
1154 }
1155 break;
1156
1157 /* This relocation describes the C++ object vtable hierarchy.
1158 Reconstruct it for later use during GC. */
1159 case R_386_GNU_VTINHERIT:
1160 if (!_bfd_elf32_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1161 return FALSE;
1162 break;
1163
1164 /* This relocation describes which C++ vtable entries are actually
1165 used. Record for later use during GC. */
1166 case R_386_GNU_VTENTRY:
1167 if (!_bfd_elf32_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1168 return FALSE;
1169 break;
1170
1171 default:
1172 break;
1173 }
1174 }
1175
1176 return TRUE;
1177 }
1178
1179 /* Return the section that should be marked against GC for a given
1180 relocation. */
1181
1182 static asection *
1183 elf_i386_gc_mark_hook (asection *sec,
1184 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1185 Elf_Internal_Rela *rel,
1186 struct elf_link_hash_entry *h,
1187 Elf_Internal_Sym *sym)
1188 {
1189 if (h != NULL)
1190 {
1191 switch (ELF32_R_TYPE (rel->r_info))
1192 {
1193 case R_386_GNU_VTINHERIT:
1194 case R_386_GNU_VTENTRY:
1195 break;
1196
1197 default:
1198 switch (h->root.type)
1199 {
1200 case bfd_link_hash_defined:
1201 case bfd_link_hash_defweak:
1202 return h->root.u.def.section;
1203
1204 case bfd_link_hash_common:
1205 return h->root.u.c.p->section;
1206
1207 default:
1208 break;
1209 }
1210 }
1211 }
1212 else
1213 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1214
1215 return NULL;
1216 }
1217
1218 /* Update the got entry reference counts for the section being removed. */
1219
1220 static bfd_boolean
1221 elf_i386_gc_sweep_hook (bfd *abfd,
1222 struct bfd_link_info *info,
1223 asection *sec,
1224 const Elf_Internal_Rela *relocs)
1225 {
1226 Elf_Internal_Shdr *symtab_hdr;
1227 struct elf_link_hash_entry **sym_hashes;
1228 bfd_signed_vma *local_got_refcounts;
1229 const Elf_Internal_Rela *rel, *relend;
1230
1231 elf_section_data (sec)->local_dynrel = NULL;
1232
1233 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1234 sym_hashes = elf_sym_hashes (abfd);
1235 local_got_refcounts = elf_local_got_refcounts (abfd);
1236
1237 relend = relocs + sec->reloc_count;
1238 for (rel = relocs; rel < relend; rel++)
1239 {
1240 unsigned long r_symndx;
1241 unsigned int r_type;
1242 struct elf_link_hash_entry *h = NULL;
1243
1244 r_symndx = ELF32_R_SYM (rel->r_info);
1245 if (r_symndx >= symtab_hdr->sh_info)
1246 {
1247 struct elf_i386_link_hash_entry *eh;
1248 struct elf_i386_dyn_relocs **pp;
1249 struct elf_i386_dyn_relocs *p;
1250
1251 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1252 eh = (struct elf_i386_link_hash_entry *) h;
1253
1254 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1255 if (p->sec == sec)
1256 {
1257 /* Everything must go for SEC. */
1258 *pp = p->next;
1259 break;
1260 }
1261 }
1262
1263 r_type = ELF32_R_TYPE (rel->r_info);
1264 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1265 switch (r_type)
1266 {
1267 case R_386_TLS_LDM:
1268 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1269 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1270 break;
1271
1272 case R_386_TLS_GD:
1273 case R_386_TLS_IE_32:
1274 case R_386_TLS_IE:
1275 case R_386_TLS_GOTIE:
1276 case R_386_GOT32:
1277 if (h != NULL)
1278 {
1279 if (h->got.refcount > 0)
1280 h->got.refcount -= 1;
1281 }
1282 else if (local_got_refcounts != NULL)
1283 {
1284 if (local_got_refcounts[r_symndx] > 0)
1285 local_got_refcounts[r_symndx] -= 1;
1286 }
1287 break;
1288
1289 case R_386_32:
1290 case R_386_PC32:
1291 if (info->shared)
1292 break;
1293 /* Fall through */
1294
1295 case R_386_PLT32:
1296 if (h != NULL)
1297 {
1298 if (h->plt.refcount > 0)
1299 h->plt.refcount -= 1;
1300 }
1301 break;
1302
1303 default:
1304 break;
1305 }
1306 }
1307
1308 return TRUE;
1309 }
1310
1311 /* Adjust a symbol defined by a dynamic object and referenced by a
1312 regular object. The current definition is in some section of the
1313 dynamic object, but we're not including those sections. We have to
1314 change the definition to something the rest of the link can
1315 understand. */
1316
1317 static bfd_boolean
1318 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1319 struct elf_link_hash_entry *h)
1320 {
1321 struct elf_i386_link_hash_table *htab;
1322 asection *s;
1323 unsigned int power_of_two;
1324
1325 /* If this is a function, put it in the procedure linkage table. We
1326 will fill in the contents of the procedure linkage table later,
1327 when we know the address of the .got section. */
1328 if (h->type == STT_FUNC
1329 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1330 {
1331 if (h->plt.refcount <= 0
1332 || SYMBOL_CALLS_LOCAL (info, h)
1333 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1334 && h->root.type == bfd_link_hash_undefweak))
1335 {
1336 /* This case can occur if we saw a PLT32 reloc in an input
1337 file, but the symbol was never referred to by a dynamic
1338 object, or if all references were garbage collected. In
1339 such a case, we don't actually need to build a procedure
1340 linkage table, and we can just do a PC32 reloc instead. */
1341 h->plt.offset = (bfd_vma) -1;
1342 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1343 }
1344
1345 return TRUE;
1346 }
1347 else
1348 /* It's possible that we incorrectly decided a .plt reloc was
1349 needed for an R_386_PC32 reloc to a non-function sym in
1350 check_relocs. We can't decide accurately between function and
1351 non-function syms in check-relocs; Objects loaded later in
1352 the link may change h->type. So fix it now. */
1353 h->plt.offset = (bfd_vma) -1;
1354
1355 /* If this is a weak symbol, and there is a real definition, the
1356 processor independent code will have arranged for us to see the
1357 real definition first, and we can just use the same value. */
1358 if (h->weakdef != NULL)
1359 {
1360 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1361 || h->weakdef->root.type == bfd_link_hash_defweak);
1362 h->root.u.def.section = h->weakdef->root.u.def.section;
1363 h->root.u.def.value = h->weakdef->root.u.def.value;
1364 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1365 h->elf_link_hash_flags
1366 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF)
1367 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF));
1368 return TRUE;
1369 }
1370
1371 /* This is a reference to a symbol defined by a dynamic object which
1372 is not a function. */
1373
1374 /* If we are creating a shared library, we must presume that the
1375 only references to the symbol are via the global offset table.
1376 For such cases we need not do anything here; the relocations will
1377 be handled correctly by relocate_section. */
1378 if (info->shared)
1379 return TRUE;
1380
1381 /* If there are no references to this symbol that do not use the
1382 GOT, we don't need to generate a copy reloc. */
1383 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1384 return TRUE;
1385
1386 /* If -z nocopyreloc was given, we won't generate them either. */
1387 if (info->nocopyreloc)
1388 {
1389 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1390 return TRUE;
1391 }
1392
1393 if (ELIMINATE_COPY_RELOCS)
1394 {
1395 struct elf_i386_link_hash_entry * eh;
1396 struct elf_i386_dyn_relocs *p;
1397
1398 eh = (struct elf_i386_link_hash_entry *) h;
1399 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1400 {
1401 s = p->sec->output_section;
1402 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1403 break;
1404 }
1405
1406 /* If we didn't find any dynamic relocs in read-only sections, then
1407 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1408 if (p == NULL)
1409 {
1410 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1411 return TRUE;
1412 }
1413 }
1414
1415 /* We must allocate the symbol in our .dynbss section, which will
1416 become part of the .bss section of the executable. There will be
1417 an entry for this symbol in the .dynsym section. The dynamic
1418 object will contain position independent code, so all references
1419 from the dynamic object to this symbol will go through the global
1420 offset table. The dynamic linker will use the .dynsym entry to
1421 determine the address it must put in the global offset table, so
1422 both the dynamic object and the regular object will refer to the
1423 same memory location for the variable. */
1424
1425 htab = elf_i386_hash_table (info);
1426
1427 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1428 copy the initial value out of the dynamic object and into the
1429 runtime process image. */
1430 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1431 {
1432 htab->srelbss->_raw_size += sizeof (Elf32_External_Rel);
1433 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1434 }
1435
1436 /* We need to figure out the alignment required for this symbol. I
1437 have no idea how ELF linkers handle this. */
1438 power_of_two = bfd_log2 (h->size);
1439 if (power_of_two > 3)
1440 power_of_two = 3;
1441
1442 /* Apply the required alignment. */
1443 s = htab->sdynbss;
1444 s->_raw_size = BFD_ALIGN (s->_raw_size, (bfd_size_type) (1 << power_of_two));
1445 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1446 {
1447 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1448 return FALSE;
1449 }
1450
1451 /* Define the symbol as being at this point in the section. */
1452 h->root.u.def.section = s;
1453 h->root.u.def.value = s->_raw_size;
1454
1455 /* Increment the section size to make room for the symbol. */
1456 s->_raw_size += h->size;
1457
1458 return TRUE;
1459 }
1460
1461 /* This is the condition under which elf_i386_finish_dynamic_symbol
1462 will be called from elflink.h. If elflink.h doesn't call our
1463 finish_dynamic_symbol routine, we'll need to do something about
1464 initializing any .plt and .got entries in elf_i386_relocate_section. */
1465 #define WILL_CALL_FINISH_DYNAMIC_SYMBOL(DYN, SHARED, H) \
1466 ((DYN) \
1467 && ((SHARED) \
1468 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) \
1469 && ((H)->dynindx != -1 \
1470 || ((H)->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0))
1471
1472 /* Allocate space in .plt, .got and associated reloc sections for
1473 dynamic relocs. */
1474
1475 static bfd_boolean
1476 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1477 {
1478 struct bfd_link_info *info;
1479 struct elf_i386_link_hash_table *htab;
1480 struct elf_i386_link_hash_entry *eh;
1481 struct elf_i386_dyn_relocs *p;
1482
1483 if (h->root.type == bfd_link_hash_indirect)
1484 return TRUE;
1485
1486 if (h->root.type == bfd_link_hash_warning)
1487 /* When warning symbols are created, they **replace** the "real"
1488 entry in the hash table, thus we never get to see the real
1489 symbol in a hash traversal. So look at it now. */
1490 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1491
1492 info = (struct bfd_link_info *) inf;
1493 htab = elf_i386_hash_table (info);
1494
1495 if (htab->elf.dynamic_sections_created
1496 && h->plt.refcount > 0)
1497 {
1498 /* Make sure this symbol is output as a dynamic symbol.
1499 Undefined weak syms won't yet be marked as dynamic. */
1500 if (h->dynindx == -1
1501 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1502 {
1503 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1504 return FALSE;
1505 }
1506
1507 if (info->shared
1508 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1509 {
1510 asection *s = htab->splt;
1511
1512 /* If this is the first .plt entry, make room for the special
1513 first entry. */
1514 if (s->_raw_size == 0)
1515 s->_raw_size += PLT_ENTRY_SIZE;
1516
1517 h->plt.offset = s->_raw_size;
1518
1519 /* If this symbol is not defined in a regular file, and we are
1520 not generating a shared library, then set the symbol to this
1521 location in the .plt. This is required to make function
1522 pointers compare as equal between the normal executable and
1523 the shared library. */
1524 if (! info->shared
1525 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1526 {
1527 h->root.u.def.section = s;
1528 h->root.u.def.value = h->plt.offset;
1529 }
1530
1531 /* Make room for this entry. */
1532 s->_raw_size += PLT_ENTRY_SIZE;
1533
1534 /* We also need to make an entry in the .got.plt section, which
1535 will be placed in the .got section by the linker script. */
1536 htab->sgotplt->_raw_size += 4;
1537
1538 /* We also need to make an entry in the .rel.plt section. */
1539 htab->srelplt->_raw_size += sizeof (Elf32_External_Rel);
1540 }
1541 else
1542 {
1543 h->plt.offset = (bfd_vma) -1;
1544 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1545 }
1546 }
1547 else
1548 {
1549 h->plt.offset = (bfd_vma) -1;
1550 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1551 }
1552
1553 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1554 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1555 if (h->got.refcount > 0
1556 && !info->shared
1557 && h->dynindx == -1
1558 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1559 h->got.offset = (bfd_vma) -1;
1560 else if (h->got.refcount > 0)
1561 {
1562 asection *s;
1563 bfd_boolean dyn;
1564 int tls_type = elf_i386_hash_entry(h)->tls_type;
1565
1566 /* Make sure this symbol is output as a dynamic symbol.
1567 Undefined weak syms won't yet be marked as dynamic. */
1568 if (h->dynindx == -1
1569 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1570 {
1571 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1572 return FALSE;
1573 }
1574
1575 s = htab->sgot;
1576 h->got.offset = s->_raw_size;
1577 s->_raw_size += 4;
1578 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1579 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1580 s->_raw_size += 4;
1581 dyn = htab->elf.dynamic_sections_created;
1582 /* R_386_TLS_IE_32 needs one dynamic relocation,
1583 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1584 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1585 need two), R_386_TLS_GD needs one if local symbol and two if
1586 global. */
1587 if (tls_type == GOT_TLS_IE_BOTH)
1588 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1589 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1590 || (tls_type & GOT_TLS_IE))
1591 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1592 else if (tls_type == GOT_TLS_GD)
1593 htab->srelgot->_raw_size += 2 * sizeof (Elf32_External_Rel);
1594 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1595 || h->root.type != bfd_link_hash_undefweak)
1596 && (info->shared
1597 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1598 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1599 }
1600 else
1601 h->got.offset = (bfd_vma) -1;
1602
1603 eh = (struct elf_i386_link_hash_entry *) h;
1604 if (eh->dyn_relocs == NULL)
1605 return TRUE;
1606
1607 /* In the shared -Bsymbolic case, discard space allocated for
1608 dynamic pc-relative relocs against symbols which turn out to be
1609 defined in regular objects. For the normal shared case, discard
1610 space for pc-relative relocs that have become local due to symbol
1611 visibility changes. */
1612
1613 if (info->shared)
1614 {
1615 /* The only reloc that uses pc_count is R_386_PC32, which will
1616 appear on a call or on something like ".long foo - .". We
1617 want calls to protected symbols to resolve directly to the
1618 function rather than going via the plt. If people want
1619 function pointer comparisons to work as expected then they
1620 should avoid writing assembly like ".long foo - .". */
1621 if (SYMBOL_CALLS_LOCAL (info, h))
1622 {
1623 struct elf_i386_dyn_relocs **pp;
1624
1625 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1626 {
1627 p->count -= p->pc_count;
1628 p->pc_count = 0;
1629 if (p->count == 0)
1630 *pp = p->next;
1631 else
1632 pp = &p->next;
1633 }
1634 }
1635
1636 /* Also discard relocs on undefined weak syms with non-default
1637 visibility. */
1638 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1639 && h->root.type == bfd_link_hash_undefweak)
1640 eh->dyn_relocs = NULL;
1641 }
1642 else if (ELIMINATE_COPY_RELOCS)
1643 {
1644 /* For the non-shared case, discard space for relocs against
1645 symbols which turn out to need copy relocs or are not
1646 dynamic. */
1647
1648 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1649 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1650 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1651 || (htab->elf.dynamic_sections_created
1652 && (h->root.type == bfd_link_hash_undefweak
1653 || h->root.type == bfd_link_hash_undefined))))
1654 {
1655 /* Make sure this symbol is output as a dynamic symbol.
1656 Undefined weak syms won't yet be marked as dynamic. */
1657 if (h->dynindx == -1
1658 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1659 {
1660 if (! bfd_elf32_link_record_dynamic_symbol (info, h))
1661 return FALSE;
1662 }
1663
1664 /* If that succeeded, we know we'll be keeping all the
1665 relocs. */
1666 if (h->dynindx != -1)
1667 goto keep;
1668 }
1669
1670 eh->dyn_relocs = NULL;
1671
1672 keep: ;
1673 }
1674
1675 /* Finally, allocate space. */
1676 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1677 {
1678 asection *sreloc = elf_section_data (p->sec)->sreloc;
1679 sreloc->_raw_size += p->count * sizeof (Elf32_External_Rel);
1680 }
1681
1682 return TRUE;
1683 }
1684
1685 /* Find any dynamic relocs that apply to read-only sections. */
1686
1687 static bfd_boolean
1688 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1689 {
1690 struct elf_i386_link_hash_entry *eh;
1691 struct elf_i386_dyn_relocs *p;
1692
1693 if (h->root.type == bfd_link_hash_warning)
1694 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1695
1696 eh = (struct elf_i386_link_hash_entry *) h;
1697 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1698 {
1699 asection *s = p->sec->output_section;
1700
1701 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1702 {
1703 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1704
1705 info->flags |= DF_TEXTREL;
1706
1707 /* Not an error, just cut short the traversal. */
1708 return FALSE;
1709 }
1710 }
1711 return TRUE;
1712 }
1713
1714 /* Set the sizes of the dynamic sections. */
1715
1716 static bfd_boolean
1717 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1718 struct bfd_link_info *info)
1719 {
1720 struct elf_i386_link_hash_table *htab;
1721 bfd *dynobj;
1722 asection *s;
1723 bfd_boolean relocs;
1724 bfd *ibfd;
1725
1726 htab = elf_i386_hash_table (info);
1727 dynobj = htab->elf.dynobj;
1728 if (dynobj == NULL)
1729 abort ();
1730
1731 if (htab->elf.dynamic_sections_created)
1732 {
1733 /* Set the contents of the .interp section to the interpreter. */
1734 if (info->executable)
1735 {
1736 s = bfd_get_section_by_name (dynobj, ".interp");
1737 if (s == NULL)
1738 abort ();
1739 s->_raw_size = sizeof ELF_DYNAMIC_INTERPRETER;
1740 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1741 }
1742 }
1743
1744 /* Set up .got offsets for local syms, and space for local dynamic
1745 relocs. */
1746 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1747 {
1748 bfd_signed_vma *local_got;
1749 bfd_signed_vma *end_local_got;
1750 char *local_tls_type;
1751 bfd_size_type locsymcount;
1752 Elf_Internal_Shdr *symtab_hdr;
1753 asection *srel;
1754
1755 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1756 continue;
1757
1758 for (s = ibfd->sections; s != NULL; s = s->next)
1759 {
1760 struct elf_i386_dyn_relocs *p;
1761
1762 for (p = *((struct elf_i386_dyn_relocs **)
1763 &elf_section_data (s)->local_dynrel);
1764 p != NULL;
1765 p = p->next)
1766 {
1767 if (!bfd_is_abs_section (p->sec)
1768 && bfd_is_abs_section (p->sec->output_section))
1769 {
1770 /* Input section has been discarded, either because
1771 it is a copy of a linkonce section or due to
1772 linker script /DISCARD/, so we'll be discarding
1773 the relocs too. */
1774 }
1775 else if (p->count != 0)
1776 {
1777 srel = elf_section_data (p->sec)->sreloc;
1778 srel->_raw_size += p->count * sizeof (Elf32_External_Rel);
1779 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1780 info->flags |= DF_TEXTREL;
1781 }
1782 }
1783 }
1784
1785 local_got = elf_local_got_refcounts (ibfd);
1786 if (!local_got)
1787 continue;
1788
1789 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1790 locsymcount = symtab_hdr->sh_info;
1791 end_local_got = local_got + locsymcount;
1792 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1793 s = htab->sgot;
1794 srel = htab->srelgot;
1795 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1796 {
1797 if (*local_got > 0)
1798 {
1799 *local_got = s->_raw_size;
1800 s->_raw_size += 4;
1801 if (*local_tls_type == GOT_TLS_GD
1802 || *local_tls_type == GOT_TLS_IE_BOTH)
1803 s->_raw_size += 4;
1804 if (info->shared
1805 || *local_tls_type == GOT_TLS_GD
1806 || (*local_tls_type & GOT_TLS_IE))
1807 {
1808 if (*local_tls_type == GOT_TLS_IE_BOTH)
1809 srel->_raw_size += 2 * sizeof (Elf32_External_Rel);
1810 else
1811 srel->_raw_size += sizeof (Elf32_External_Rel);
1812 }
1813 }
1814 else
1815 *local_got = (bfd_vma) -1;
1816 }
1817 }
1818
1819 if (htab->tls_ldm_got.refcount > 0)
1820 {
1821 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1822 relocs. */
1823 htab->tls_ldm_got.offset = htab->sgot->_raw_size;
1824 htab->sgot->_raw_size += 8;
1825 htab->srelgot->_raw_size += sizeof (Elf32_External_Rel);
1826 }
1827 else
1828 htab->tls_ldm_got.offset = -1;
1829
1830 /* Allocate global sym .plt and .got entries, and space for global
1831 sym dynamic relocs. */
1832 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1833
1834 /* We now have determined the sizes of the various dynamic sections.
1835 Allocate memory for them. */
1836 relocs = FALSE;
1837 for (s = dynobj->sections; s != NULL; s = s->next)
1838 {
1839 if ((s->flags & SEC_LINKER_CREATED) == 0)
1840 continue;
1841
1842 if (s == htab->splt
1843 || s == htab->sgot
1844 || s == htab->sgotplt)
1845 {
1846 /* Strip this section if we don't need it; see the
1847 comment below. */
1848 }
1849 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1850 {
1851 if (s->_raw_size != 0 && s != htab->srelplt)
1852 relocs = TRUE;
1853
1854 /* We use the reloc_count field as a counter if we need
1855 to copy relocs into the output file. */
1856 s->reloc_count = 0;
1857 }
1858 else
1859 {
1860 /* It's not one of our sections, so don't allocate space. */
1861 continue;
1862 }
1863
1864 if (s->_raw_size == 0)
1865 {
1866 /* If we don't need this section, strip it from the
1867 output file. This is mostly to handle .rel.bss and
1868 .rel.plt. We must create both sections in
1869 create_dynamic_sections, because they must be created
1870 before the linker maps input sections to output
1871 sections. The linker does that before
1872 adjust_dynamic_symbol is called, and it is that
1873 function which decides whether anything needs to go
1874 into these sections. */
1875
1876 _bfd_strip_section_from_output (info, s);
1877 continue;
1878 }
1879
1880 /* Allocate memory for the section contents. We use bfd_zalloc
1881 here in case unused entries are not reclaimed before the
1882 section's contents are written out. This should not happen,
1883 but this way if it does, we get a R_386_NONE reloc instead
1884 of garbage. */
1885 s->contents = bfd_zalloc (dynobj, s->_raw_size);
1886 if (s->contents == NULL)
1887 return FALSE;
1888 }
1889
1890 if (htab->elf.dynamic_sections_created)
1891 {
1892 /* Add some entries to the .dynamic section. We fill in the
1893 values later, in elf_i386_finish_dynamic_sections, but we
1894 must add the entries now so that we get the correct size for
1895 the .dynamic section. The DT_DEBUG entry is filled in by the
1896 dynamic linker and used by the debugger. */
1897 #define add_dynamic_entry(TAG, VAL) \
1898 bfd_elf32_add_dynamic_entry (info, (TAG), (VAL))
1899
1900 if (info->executable)
1901 {
1902 if (!add_dynamic_entry (DT_DEBUG, 0))
1903 return FALSE;
1904 }
1905
1906 if (htab->splt->_raw_size != 0)
1907 {
1908 if (!add_dynamic_entry (DT_PLTGOT, 0)
1909 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1910 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1911 || !add_dynamic_entry (DT_JMPREL, 0))
1912 return FALSE;
1913 }
1914
1915 if (relocs)
1916 {
1917 if (!add_dynamic_entry (DT_REL, 0)
1918 || !add_dynamic_entry (DT_RELSZ, 0)
1919 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
1920 return FALSE;
1921
1922 /* If any dynamic relocs apply to a read-only section,
1923 then we need a DT_TEXTREL entry. */
1924 if ((info->flags & DF_TEXTREL) == 0)
1925 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1926 (PTR) info);
1927
1928 if ((info->flags & DF_TEXTREL) != 0)
1929 {
1930 if (!add_dynamic_entry (DT_TEXTREL, 0))
1931 return FALSE;
1932 }
1933 }
1934 }
1935 #undef add_dynamic_entry
1936
1937 return TRUE;
1938 }
1939
1940 /* Set the correct type for an x86 ELF section. We do this by the
1941 section name, which is a hack, but ought to work. */
1942
1943 static bfd_boolean
1944 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1945 Elf_Internal_Shdr *hdr,
1946 asection *sec)
1947 {
1948 register const char *name;
1949
1950 name = bfd_get_section_name (abfd, sec);
1951
1952 /* This is an ugly, but unfortunately necessary hack that is
1953 needed when producing EFI binaries on x86. It tells
1954 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1955 containing ELF relocation info. We need this hack in order to
1956 be able to generate ELF binaries that can be translated into
1957 EFI applications (which are essentially COFF objects). Those
1958 files contain a COFF ".reloc" section inside an ELFNN object,
1959 which would normally cause BFD to segfault because it would
1960 attempt to interpret this section as containing relocation
1961 entries for section "oc". With this hack enabled, ".reloc"
1962 will be treated as a normal data section, which will avoid the
1963 segfault. However, you won't be able to create an ELFNN binary
1964 with a section named "oc" that needs relocations, but that's
1965 the kind of ugly side-effects you get when detecting section
1966 types based on their names... In practice, this limitation is
1967 unlikely to bite. */
1968 if (strcmp (name, ".reloc") == 0)
1969 hdr->sh_type = SHT_PROGBITS;
1970
1971 return TRUE;
1972 }
1973
1974 /* Return the base VMA address which should be subtracted from real addresses
1975 when resolving @dtpoff relocation.
1976 This is PT_TLS segment p_vaddr. */
1977
1978 static bfd_vma
1979 dtpoff_base (struct bfd_link_info *info)
1980 {
1981 /* If tls_sec is NULL, we should have signalled an error already. */
1982 if (elf_hash_table (info)->tls_sec == NULL)
1983 return 0;
1984 return elf_hash_table (info)->tls_sec->vma;
1985 }
1986
1987 /* Return the relocation value for @tpoff relocation
1988 if STT_TLS virtual address is ADDRESS. */
1989
1990 static bfd_vma
1991 tpoff (struct bfd_link_info *info, bfd_vma address)
1992 {
1993 struct elf_link_hash_table *htab = elf_hash_table (info);
1994
1995 /* If tls_sec is NULL, we should have signalled an error already. */
1996 if (htab->tls_sec == NULL)
1997 return 0;
1998 return htab->tls_size + htab->tls_sec->vma - address;
1999 }
2000
2001 /* Relocate an i386 ELF section. */
2002
2003 static bfd_boolean
2004 elf_i386_relocate_section (bfd *output_bfd,
2005 struct bfd_link_info *info,
2006 bfd *input_bfd,
2007 asection *input_section,
2008 bfd_byte *contents,
2009 Elf_Internal_Rela *relocs,
2010 Elf_Internal_Sym *local_syms,
2011 asection **local_sections)
2012 {
2013 struct elf_i386_link_hash_table *htab;
2014 Elf_Internal_Shdr *symtab_hdr;
2015 struct elf_link_hash_entry **sym_hashes;
2016 bfd_vma *local_got_offsets;
2017 Elf_Internal_Rela *rel;
2018 Elf_Internal_Rela *relend;
2019
2020 htab = elf_i386_hash_table (info);
2021 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2022 sym_hashes = elf_sym_hashes (input_bfd);
2023 local_got_offsets = elf_local_got_offsets (input_bfd);
2024
2025 rel = relocs;
2026 relend = relocs + input_section->reloc_count;
2027 for (; rel < relend; rel++)
2028 {
2029 unsigned int r_type;
2030 reloc_howto_type *howto;
2031 unsigned long r_symndx;
2032 struct elf_link_hash_entry *h;
2033 Elf_Internal_Sym *sym;
2034 asection *sec;
2035 bfd_vma off;
2036 bfd_vma relocation;
2037 bfd_boolean unresolved_reloc;
2038 bfd_reloc_status_type r;
2039 unsigned int indx;
2040 int tls_type;
2041
2042 r_type = ELF32_R_TYPE (rel->r_info);
2043 if (r_type == R_386_GNU_VTINHERIT
2044 || r_type == R_386_GNU_VTENTRY)
2045 continue;
2046
2047 if ((indx = r_type) >= R_386_standard
2048 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2049 >= R_386_ext - R_386_standard)
2050 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2051 >= R_386_tls - R_386_ext))
2052 {
2053 bfd_set_error (bfd_error_bad_value);
2054 return FALSE;
2055 }
2056 howto = elf_howto_table + indx;
2057
2058 r_symndx = ELF32_R_SYM (rel->r_info);
2059
2060 if (info->relocatable)
2061 {
2062 bfd_vma val;
2063 bfd_byte *where;
2064
2065 /* This is a relocatable link. We don't have to change
2066 anything, unless the reloc is against a section symbol,
2067 in which case we have to adjust according to where the
2068 section symbol winds up in the output section. */
2069 if (r_symndx >= symtab_hdr->sh_info)
2070 continue;
2071
2072 sym = local_syms + r_symndx;
2073 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2074 continue;
2075
2076 sec = local_sections[r_symndx];
2077 val = sec->output_offset;
2078 if (val == 0)
2079 continue;
2080
2081 where = contents + rel->r_offset;
2082 switch (howto->size)
2083 {
2084 /* FIXME: overflow checks. */
2085 case 0:
2086 val += bfd_get_8 (input_bfd, where);
2087 bfd_put_8 (input_bfd, val, where);
2088 break;
2089 case 1:
2090 val += bfd_get_16 (input_bfd, where);
2091 bfd_put_16 (input_bfd, val, where);
2092 break;
2093 case 2:
2094 val += bfd_get_32 (input_bfd, where);
2095 bfd_put_32 (input_bfd, val, where);
2096 break;
2097 default:
2098 abort ();
2099 }
2100 continue;
2101 }
2102
2103 /* This is a final link. */
2104 h = NULL;
2105 sym = NULL;
2106 sec = NULL;
2107 unresolved_reloc = FALSE;
2108 if (r_symndx < symtab_hdr->sh_info)
2109 {
2110 sym = local_syms + r_symndx;
2111 sec = local_sections[r_symndx];
2112 relocation = (sec->output_section->vma
2113 + sec->output_offset
2114 + sym->st_value);
2115 if ((sec->flags & SEC_MERGE)
2116 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2117 {
2118 asection *msec;
2119 bfd_vma addend;
2120 bfd_byte *where = contents + rel->r_offset;
2121
2122 switch (howto->size)
2123 {
2124 case 0:
2125 addend = bfd_get_8 (input_bfd, where);
2126 if (howto->pc_relative)
2127 {
2128 addend = (addend ^ 0x80) - 0x80;
2129 addend += 1;
2130 }
2131 break;
2132 case 1:
2133 addend = bfd_get_16 (input_bfd, where);
2134 if (howto->pc_relative)
2135 {
2136 addend = (addend ^ 0x8000) - 0x8000;
2137 addend += 2;
2138 }
2139 break;
2140 case 2:
2141 addend = bfd_get_32 (input_bfd, where);
2142 if (howto->pc_relative)
2143 {
2144 addend = (addend ^ 0x80000000) - 0x80000000;
2145 addend += 4;
2146 }
2147 break;
2148 default:
2149 abort ();
2150 }
2151
2152 msec = sec;
2153 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2154 addend -= relocation;
2155 addend += msec->output_section->vma + msec->output_offset;
2156
2157 switch (howto->size)
2158 {
2159 case 0:
2160 /* FIXME: overflow checks. */
2161 if (howto->pc_relative)
2162 addend -= 1;
2163 bfd_put_8 (input_bfd, addend, where);
2164 break;
2165 case 1:
2166 if (howto->pc_relative)
2167 addend -= 2;
2168 bfd_put_16 (input_bfd, addend, where);
2169 break;
2170 case 2:
2171 if (howto->pc_relative)
2172 addend -= 4;
2173 bfd_put_32 (input_bfd, addend, where);
2174 break;
2175 }
2176 }
2177 }
2178 else
2179 {
2180 bfd_boolean warned;
2181
2182 RELOC_FOR_GLOBAL_SYMBOL (h, sym_hashes, r_symndx, symtab_hdr, relocation, sec, unresolved_reloc, info, warned);
2183 }
2184
2185 switch (r_type)
2186 {
2187 case R_386_GOT32:
2188 /* Relocation is to the entry for this symbol in the global
2189 offset table. */
2190 if (htab->sgot == NULL)
2191 abort ();
2192
2193 if (h != NULL)
2194 {
2195 bfd_boolean dyn;
2196
2197 off = h->got.offset;
2198 dyn = htab->elf.dynamic_sections_created;
2199 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2200 || (info->shared
2201 && SYMBOL_REFERENCES_LOCAL (info, h))
2202 || (ELF_ST_VISIBILITY (h->other)
2203 && h->root.type == bfd_link_hash_undefweak))
2204 {
2205 /* This is actually a static link, or it is a
2206 -Bsymbolic link and the symbol is defined
2207 locally, or the symbol was forced to be local
2208 because of a version file. We must initialize
2209 this entry in the global offset table. Since the
2210 offset must always be a multiple of 4, we use the
2211 least significant bit to record whether we have
2212 initialized it already.
2213
2214 When doing a dynamic link, we create a .rel.got
2215 relocation entry to initialize the value. This
2216 is done in the finish_dynamic_symbol routine. */
2217 if ((off & 1) != 0)
2218 off &= ~1;
2219 else
2220 {
2221 bfd_put_32 (output_bfd, relocation,
2222 htab->sgot->contents + off);
2223 h->got.offset |= 1;
2224 }
2225 }
2226 else
2227 unresolved_reloc = FALSE;
2228 }
2229 else
2230 {
2231 if (local_got_offsets == NULL)
2232 abort ();
2233
2234 off = local_got_offsets[r_symndx];
2235
2236 /* The offset must always be a multiple of 4. We use
2237 the least significant bit to record whether we have
2238 already generated the necessary reloc. */
2239 if ((off & 1) != 0)
2240 off &= ~1;
2241 else
2242 {
2243 bfd_put_32 (output_bfd, relocation,
2244 htab->sgot->contents + off);
2245
2246 if (info->shared)
2247 {
2248 asection *s;
2249 Elf_Internal_Rela outrel;
2250 bfd_byte *loc;
2251
2252 s = htab->srelgot;
2253 if (s == NULL)
2254 abort ();
2255
2256 outrel.r_offset = (htab->sgot->output_section->vma
2257 + htab->sgot->output_offset
2258 + off);
2259 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2260 loc = s->contents;
2261 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2262 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2263 }
2264
2265 local_got_offsets[r_symndx] |= 1;
2266 }
2267 }
2268
2269 if (off >= (bfd_vma) -2)
2270 abort ();
2271
2272 relocation = htab->sgot->output_offset + off;
2273 break;
2274
2275 case R_386_GOTOFF:
2276 /* Relocation is relative to the start of the global offset
2277 table. */
2278
2279 /* Note that sgot->output_offset is not involved in this
2280 calculation. We always want the start of .got. If we
2281 defined _GLOBAL_OFFSET_TABLE in a different way, as is
2282 permitted by the ABI, we might have to change this
2283 calculation. */
2284 relocation -= htab->sgot->output_section->vma;
2285 break;
2286
2287 case R_386_GOTPC:
2288 /* Use global offset table as symbol value. */
2289 relocation = htab->sgot->output_section->vma;
2290 unresolved_reloc = FALSE;
2291 break;
2292
2293 case R_386_PLT32:
2294 /* Relocation is to the entry for this symbol in the
2295 procedure linkage table. */
2296
2297 /* Resolve a PLT32 reloc against a local symbol directly,
2298 without using the procedure linkage table. */
2299 if (h == NULL)
2300 break;
2301
2302 if (h->plt.offset == (bfd_vma) -1
2303 || htab->splt == NULL)
2304 {
2305 /* We didn't make a PLT entry for this symbol. This
2306 happens when statically linking PIC code, or when
2307 using -Bsymbolic. */
2308 break;
2309 }
2310
2311 relocation = (htab->splt->output_section->vma
2312 + htab->splt->output_offset
2313 + h->plt.offset);
2314 unresolved_reloc = FALSE;
2315 break;
2316
2317 case R_386_32:
2318 case R_386_PC32:
2319 /* r_symndx will be zero only for relocs against symbols
2320 from removed linkonce sections, or sections discarded by
2321 a linker script. */
2322 if (r_symndx == 0
2323 || (input_section->flags & SEC_ALLOC) == 0)
2324 break;
2325
2326 if ((info->shared
2327 && (h == NULL
2328 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2329 || h->root.type != bfd_link_hash_undefweak)
2330 && (r_type != R_386_PC32
2331 || !SYMBOL_CALLS_LOCAL (info, h)))
2332 || (ELIMINATE_COPY_RELOCS
2333 && !info->shared
2334 && h != NULL
2335 && h->dynindx != -1
2336 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2337 && (((h->elf_link_hash_flags
2338 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2339 && (h->elf_link_hash_flags
2340 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2341 || h->root.type == bfd_link_hash_undefweak
2342 || h->root.type == bfd_link_hash_undefined)))
2343 {
2344 Elf_Internal_Rela outrel;
2345 bfd_byte *loc;
2346 bfd_boolean skip, relocate;
2347 asection *sreloc;
2348
2349 /* When generating a shared object, these relocations
2350 are copied into the output file to be resolved at run
2351 time. */
2352
2353 skip = FALSE;
2354 relocate = FALSE;
2355
2356 outrel.r_offset =
2357 _bfd_elf_section_offset (output_bfd, info, input_section,
2358 rel->r_offset);
2359 if (outrel.r_offset == (bfd_vma) -1)
2360 skip = TRUE;
2361 else if (outrel.r_offset == (bfd_vma) -2)
2362 skip = TRUE, relocate = TRUE;
2363 outrel.r_offset += (input_section->output_section->vma
2364 + input_section->output_offset);
2365
2366 if (skip)
2367 memset (&outrel, 0, sizeof outrel);
2368 else if (h != NULL
2369 && h->dynindx != -1
2370 && (r_type == R_386_PC32
2371 || !info->shared
2372 || !info->symbolic
2373 || (h->elf_link_hash_flags
2374 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2375 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2376 else
2377 {
2378 /* This symbol is local, or marked to become local. */
2379 relocate = TRUE;
2380 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2381 }
2382
2383 sreloc = elf_section_data (input_section)->sreloc;
2384 if (sreloc == NULL)
2385 abort ();
2386
2387 loc = sreloc->contents;
2388 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2389 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2390
2391 /* If this reloc is against an external symbol, we do
2392 not want to fiddle with the addend. Otherwise, we
2393 need to include the symbol value so that it becomes
2394 an addend for the dynamic reloc. */
2395 if (! relocate)
2396 continue;
2397 }
2398 break;
2399
2400 case R_386_TLS_IE:
2401 if (info->shared)
2402 {
2403 Elf_Internal_Rela outrel;
2404 bfd_byte *loc;
2405 asection *sreloc;
2406
2407 outrel.r_offset = rel->r_offset
2408 + input_section->output_section->vma
2409 + input_section->output_offset;
2410 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2411 sreloc = elf_section_data (input_section)->sreloc;
2412 if (sreloc == NULL)
2413 abort ();
2414 loc = sreloc->contents;
2415 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2416 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2417 }
2418 /* Fall through */
2419
2420 case R_386_TLS_GD:
2421 case R_386_TLS_IE_32:
2422 case R_386_TLS_GOTIE:
2423 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2424 tls_type = GOT_UNKNOWN;
2425 if (h == NULL && local_got_offsets)
2426 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2427 else if (h != NULL)
2428 {
2429 tls_type = elf_i386_hash_entry(h)->tls_type;
2430 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2431 r_type = R_386_TLS_LE_32;
2432 }
2433 if (tls_type == GOT_TLS_IE)
2434 tls_type = GOT_TLS_IE_NEG;
2435 if (r_type == R_386_TLS_GD)
2436 {
2437 if (tls_type == GOT_TLS_IE_POS)
2438 r_type = R_386_TLS_GOTIE;
2439 else if (tls_type & GOT_TLS_IE)
2440 r_type = R_386_TLS_IE_32;
2441 }
2442
2443 if (r_type == R_386_TLS_LE_32)
2444 {
2445 BFD_ASSERT (! unresolved_reloc);
2446 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2447 {
2448 unsigned int val, type;
2449 bfd_vma roff;
2450
2451 /* GD->LE transition. */
2452 BFD_ASSERT (rel->r_offset >= 2);
2453 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2454 BFD_ASSERT (type == 0x8d || type == 0x04);
2455 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2456 BFD_ASSERT (bfd_get_8 (input_bfd,
2457 contents + rel->r_offset + 4)
2458 == 0xe8);
2459 BFD_ASSERT (rel + 1 < relend);
2460 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2461 roff = rel->r_offset + 5;
2462 val = bfd_get_8 (input_bfd,
2463 contents + rel->r_offset - 1);
2464 if (type == 0x04)
2465 {
2466 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2467 Change it into:
2468 movl %gs:0, %eax; subl $foo@tpoff, %eax
2469 (6 byte form of subl). */
2470 BFD_ASSERT (rel->r_offset >= 3);
2471 BFD_ASSERT (bfd_get_8 (input_bfd,
2472 contents + rel->r_offset - 3)
2473 == 0x8d);
2474 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2475 memcpy (contents + rel->r_offset - 3,
2476 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2477 }
2478 else
2479 {
2480 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2481 if (rel->r_offset + 10 <= input_section->_raw_size
2482 && bfd_get_8 (input_bfd,
2483 contents + rel->r_offset + 9) == 0x90)
2484 {
2485 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2486 Change it into:
2487 movl %gs:0, %eax; subl $foo@tpoff, %eax
2488 (6 byte form of subl). */
2489 memcpy (contents + rel->r_offset - 2,
2490 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2491 roff = rel->r_offset + 6;
2492 }
2493 else
2494 {
2495 /* leal foo(%reg), %eax; call ___tls_get_addr
2496 Change it into:
2497 movl %gs:0, %eax; subl $foo@tpoff, %eax
2498 (5 byte form of subl). */
2499 memcpy (contents + rel->r_offset - 2,
2500 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2501 }
2502 }
2503 bfd_put_32 (output_bfd, tpoff (info, relocation),
2504 contents + roff);
2505 /* Skip R_386_PLT32. */
2506 rel++;
2507 continue;
2508 }
2509 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2510 {
2511 unsigned int val, type;
2512
2513 /* IE->LE transition:
2514 Originally it can be one of:
2515 movl foo, %eax
2516 movl foo, %reg
2517 addl foo, %reg
2518 We change it into:
2519 movl $foo, %eax
2520 movl $foo, %reg
2521 addl $foo, %reg. */
2522 BFD_ASSERT (rel->r_offset >= 1);
2523 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2524 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2525 if (val == 0xa1)
2526 {
2527 /* movl foo, %eax. */
2528 bfd_put_8 (output_bfd, 0xb8,
2529 contents + rel->r_offset - 1);
2530 }
2531 else
2532 {
2533 BFD_ASSERT (rel->r_offset >= 2);
2534 type = bfd_get_8 (input_bfd,
2535 contents + rel->r_offset - 2);
2536 switch (type)
2537 {
2538 case 0x8b:
2539 /* movl */
2540 BFD_ASSERT ((val & 0xc7) == 0x05);
2541 bfd_put_8 (output_bfd, 0xc7,
2542 contents + rel->r_offset - 2);
2543 bfd_put_8 (output_bfd,
2544 0xc0 | ((val >> 3) & 7),
2545 contents + rel->r_offset - 1);
2546 break;
2547 case 0x03:
2548 /* addl */
2549 BFD_ASSERT ((val & 0xc7) == 0x05);
2550 bfd_put_8 (output_bfd, 0x81,
2551 contents + rel->r_offset - 2);
2552 bfd_put_8 (output_bfd,
2553 0xc0 | ((val >> 3) & 7),
2554 contents + rel->r_offset - 1);
2555 break;
2556 default:
2557 BFD_FAIL ();
2558 break;
2559 }
2560 }
2561 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2562 contents + rel->r_offset);
2563 continue;
2564 }
2565 else
2566 {
2567 unsigned int val, type;
2568
2569 /* {IE_32,GOTIE}->LE transition:
2570 Originally it can be one of:
2571 subl foo(%reg1), %reg2
2572 movl foo(%reg1), %reg2
2573 addl foo(%reg1), %reg2
2574 We change it into:
2575 subl $foo, %reg2
2576 movl $foo, %reg2 (6 byte form)
2577 addl $foo, %reg2. */
2578 BFD_ASSERT (rel->r_offset >= 2);
2579 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2580 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2581 BFD_ASSERT (rel->r_offset + 4 <= input_section->_raw_size);
2582 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2583 if (type == 0x8b)
2584 {
2585 /* movl */
2586 bfd_put_8 (output_bfd, 0xc7,
2587 contents + rel->r_offset - 2);
2588 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2589 contents + rel->r_offset - 1);
2590 }
2591 else if (type == 0x2b)
2592 {
2593 /* subl */
2594 bfd_put_8 (output_bfd, 0x81,
2595 contents + rel->r_offset - 2);
2596 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2597 contents + rel->r_offset - 1);
2598 }
2599 else if (type == 0x03)
2600 {
2601 /* addl */
2602 bfd_put_8 (output_bfd, 0x81,
2603 contents + rel->r_offset - 2);
2604 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2605 contents + rel->r_offset - 1);
2606 }
2607 else
2608 BFD_FAIL ();
2609 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2610 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2611 contents + rel->r_offset);
2612 else
2613 bfd_put_32 (output_bfd, tpoff (info, relocation),
2614 contents + rel->r_offset);
2615 continue;
2616 }
2617 }
2618
2619 if (htab->sgot == NULL)
2620 abort ();
2621
2622 if (h != NULL)
2623 off = h->got.offset;
2624 else
2625 {
2626 if (local_got_offsets == NULL)
2627 abort ();
2628
2629 off = local_got_offsets[r_symndx];
2630 }
2631
2632 if ((off & 1) != 0)
2633 off &= ~1;
2634 else
2635 {
2636 Elf_Internal_Rela outrel;
2637 bfd_byte *loc;
2638 int dr_type, indx;
2639
2640 if (htab->srelgot == NULL)
2641 abort ();
2642
2643 outrel.r_offset = (htab->sgot->output_section->vma
2644 + htab->sgot->output_offset + off);
2645
2646 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2647 if (r_type == R_386_TLS_GD)
2648 dr_type = R_386_TLS_DTPMOD32;
2649 else if (tls_type == GOT_TLS_IE_POS)
2650 dr_type = R_386_TLS_TPOFF;
2651 else
2652 dr_type = R_386_TLS_TPOFF32;
2653 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2654 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2655 htab->sgot->contents + off);
2656 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2657 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2658 htab->sgot->contents + off);
2659 else
2660 bfd_put_32 (output_bfd, 0,
2661 htab->sgot->contents + off);
2662 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2663 loc = htab->srelgot->contents;
2664 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2665 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2666
2667 if (r_type == R_386_TLS_GD)
2668 {
2669 if (indx == 0)
2670 {
2671 BFD_ASSERT (! unresolved_reloc);
2672 bfd_put_32 (output_bfd,
2673 relocation - dtpoff_base (info),
2674 htab->sgot->contents + off + 4);
2675 }
2676 else
2677 {
2678 bfd_put_32 (output_bfd, 0,
2679 htab->sgot->contents + off + 4);
2680 outrel.r_info = ELF32_R_INFO (indx,
2681 R_386_TLS_DTPOFF32);
2682 outrel.r_offset += 4;
2683 htab->srelgot->reloc_count++;
2684 loc += sizeof (Elf32_External_Rel);
2685 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2686 }
2687 }
2688 else if (tls_type == GOT_TLS_IE_BOTH)
2689 {
2690 bfd_put_32 (output_bfd,
2691 indx == 0 ? relocation - dtpoff_base (info) : 0,
2692 htab->sgot->contents + off + 4);
2693 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2694 outrel.r_offset += 4;
2695 htab->srelgot->reloc_count++;
2696 loc += sizeof (Elf32_External_Rel);
2697 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2698 }
2699
2700 if (h != NULL)
2701 h->got.offset |= 1;
2702 else
2703 local_got_offsets[r_symndx] |= 1;
2704 }
2705
2706 if (off >= (bfd_vma) -2)
2707 abort ();
2708 if (r_type == ELF32_R_TYPE (rel->r_info))
2709 {
2710 relocation = htab->sgot->output_offset + off;
2711 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2712 && tls_type == GOT_TLS_IE_BOTH)
2713 relocation += 4;
2714 if (r_type == R_386_TLS_IE)
2715 relocation += htab->sgot->output_section->vma;
2716 unresolved_reloc = FALSE;
2717 }
2718 else
2719 {
2720 unsigned int val, type;
2721 bfd_vma roff;
2722
2723 /* GD->IE transition. */
2724 BFD_ASSERT (rel->r_offset >= 2);
2725 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2726 BFD_ASSERT (type == 0x8d || type == 0x04);
2727 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2728 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2729 == 0xe8);
2730 BFD_ASSERT (rel + 1 < relend);
2731 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2732 roff = rel->r_offset - 3;
2733 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2734 if (type == 0x04)
2735 {
2736 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2737 Change it into:
2738 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2739 BFD_ASSERT (rel->r_offset >= 3);
2740 BFD_ASSERT (bfd_get_8 (input_bfd,
2741 contents + rel->r_offset - 3)
2742 == 0x8d);
2743 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2744 val >>= 3;
2745 }
2746 else
2747 {
2748 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2749 Change it into:
2750 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2751 BFD_ASSERT (rel->r_offset + 10 <= input_section->_raw_size);
2752 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2753 BFD_ASSERT (bfd_get_8 (input_bfd,
2754 contents + rel->r_offset + 9)
2755 == 0x90);
2756 roff = rel->r_offset - 2;
2757 }
2758 memcpy (contents + roff,
2759 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2760 contents[roff + 7] = 0x80 | (val & 7);
2761 /* If foo is used only with foo@gotntpoff(%reg) and
2762 foo@indntpoff, but not with foo@gottpoff(%reg), change
2763 subl $foo@gottpoff(%reg), %eax
2764 into:
2765 addl $foo@gotntpoff(%reg), %eax. */
2766 if (r_type == R_386_TLS_GOTIE)
2767 {
2768 contents[roff + 6] = 0x03;
2769 if (tls_type == GOT_TLS_IE_BOTH)
2770 off += 4;
2771 }
2772 bfd_put_32 (output_bfd, htab->sgot->output_offset + off,
2773 contents + roff + 8);
2774 /* Skip R_386_PLT32. */
2775 rel++;
2776 continue;
2777 }
2778 break;
2779
2780 case R_386_TLS_LDM:
2781 if (! info->shared)
2782 {
2783 unsigned int val;
2784
2785 /* LD->LE transition:
2786 Ensure it is:
2787 leal foo(%reg), %eax; call ___tls_get_addr.
2788 We change it into:
2789 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2790 BFD_ASSERT (rel->r_offset >= 2);
2791 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2792 == 0x8d);
2793 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2794 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2795 BFD_ASSERT (rel->r_offset + 9 <= input_section->_raw_size);
2796 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2797 == 0xe8);
2798 BFD_ASSERT (rel + 1 < relend);
2799 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2800 memcpy (contents + rel->r_offset - 2,
2801 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2802 /* Skip R_386_PLT32. */
2803 rel++;
2804 continue;
2805 }
2806
2807 if (htab->sgot == NULL)
2808 abort ();
2809
2810 off = htab->tls_ldm_got.offset;
2811 if (off & 1)
2812 off &= ~1;
2813 else
2814 {
2815 Elf_Internal_Rela outrel;
2816 bfd_byte *loc;
2817
2818 if (htab->srelgot == NULL)
2819 abort ();
2820
2821 outrel.r_offset = (htab->sgot->output_section->vma
2822 + htab->sgot->output_offset + off);
2823
2824 bfd_put_32 (output_bfd, 0,
2825 htab->sgot->contents + off);
2826 bfd_put_32 (output_bfd, 0,
2827 htab->sgot->contents + off + 4);
2828 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2829 loc = htab->srelgot->contents;
2830 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2831 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2832 htab->tls_ldm_got.offset |= 1;
2833 }
2834 relocation = htab->sgot->output_offset + off;
2835 unresolved_reloc = FALSE;
2836 break;
2837
2838 case R_386_TLS_LDO_32:
2839 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2840 relocation -= dtpoff_base (info);
2841 else
2842 /* When converting LDO to LE, we must negate. */
2843 relocation = -tpoff (info, relocation);
2844 break;
2845
2846 case R_386_TLS_LE_32:
2847 case R_386_TLS_LE:
2848 if (info->shared)
2849 {
2850 Elf_Internal_Rela outrel;
2851 asection *sreloc;
2852 bfd_byte *loc;
2853 int indx;
2854
2855 outrel.r_offset = rel->r_offset
2856 + input_section->output_section->vma
2857 + input_section->output_offset;
2858 if (h != NULL && h->dynindx != -1)
2859 indx = h->dynindx;
2860 else
2861 indx = 0;
2862 if (r_type == R_386_TLS_LE_32)
2863 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2864 else
2865 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2866 sreloc = elf_section_data (input_section)->sreloc;
2867 if (sreloc == NULL)
2868 abort ();
2869 loc = sreloc->contents;
2870 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2871 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2872 if (indx)
2873 continue;
2874 else if (r_type == R_386_TLS_LE_32)
2875 relocation = dtpoff_base (info) - relocation;
2876 else
2877 relocation -= dtpoff_base (info);
2878 }
2879 else if (r_type == R_386_TLS_LE_32)
2880 relocation = tpoff (info, relocation);
2881 else
2882 relocation = -tpoff (info, relocation);
2883 break;
2884
2885 default:
2886 break;
2887 }
2888
2889 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2890 because such sections are not SEC_ALLOC and thus ld.so will
2891 not process them. */
2892 if (unresolved_reloc
2893 && !((input_section->flags & SEC_DEBUGGING) != 0
2894 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2895 {
2896 (*_bfd_error_handler)
2897 (_("%s(%s+0x%lx): unresolvable relocation against symbol `%s'"),
2898 bfd_archive_filename (input_bfd),
2899 bfd_get_section_name (input_bfd, input_section),
2900 (long) rel->r_offset,
2901 h->root.root.string);
2902 return FALSE;
2903 }
2904
2905 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2906 contents, rel->r_offset,
2907 relocation, 0);
2908
2909 if (r != bfd_reloc_ok)
2910 {
2911 const char *name;
2912
2913 if (h != NULL)
2914 name = h->root.root.string;
2915 else
2916 {
2917 name = bfd_elf_string_from_elf_section (input_bfd,
2918 symtab_hdr->sh_link,
2919 sym->st_name);
2920 if (name == NULL)
2921 return FALSE;
2922 if (*name == '\0')
2923 name = bfd_section_name (input_bfd, sec);
2924 }
2925
2926 if (r == bfd_reloc_overflow)
2927 {
2928 if (! ((*info->callbacks->reloc_overflow)
2929 (info, name, howto->name, 0,
2930 input_bfd, input_section, rel->r_offset)))
2931 return FALSE;
2932 }
2933 else
2934 {
2935 (*_bfd_error_handler)
2936 (_("%s(%s+0x%lx): reloc against `%s': error %d"),
2937 bfd_archive_filename (input_bfd),
2938 bfd_get_section_name (input_bfd, input_section),
2939 (long) rel->r_offset, name, (int) r);
2940 return FALSE;
2941 }
2942 }
2943 }
2944
2945 return TRUE;
2946 }
2947
2948 /* Finish up dynamic symbol handling. We set the contents of various
2949 dynamic sections here. */
2950
2951 static bfd_boolean
2952 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
2953 struct bfd_link_info *info,
2954 struct elf_link_hash_entry *h,
2955 Elf_Internal_Sym *sym)
2956 {
2957 struct elf_i386_link_hash_table *htab;
2958
2959 htab = elf_i386_hash_table (info);
2960
2961 if (h->plt.offset != (bfd_vma) -1)
2962 {
2963 bfd_vma plt_index;
2964 bfd_vma got_offset;
2965 Elf_Internal_Rela rel;
2966 bfd_byte *loc;
2967
2968 /* This symbol has an entry in the procedure linkage table. Set
2969 it up. */
2970
2971 if (h->dynindx == -1
2972 || htab->splt == NULL
2973 || htab->sgotplt == NULL
2974 || htab->srelplt == NULL)
2975 abort ();
2976
2977 /* Get the index in the procedure linkage table which
2978 corresponds to this symbol. This is the index of this symbol
2979 in all the symbols for which we are making plt entries. The
2980 first entry in the procedure linkage table is reserved. */
2981 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2982
2983 /* Get the offset into the .got table of the entry that
2984 corresponds to this function. Each .got entry is 4 bytes.
2985 The first three are reserved. */
2986 got_offset = (plt_index + 3) * 4;
2987
2988 /* Fill in the entry in the procedure linkage table. */
2989 if (! info->shared)
2990 {
2991 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
2992 PLT_ENTRY_SIZE);
2993 bfd_put_32 (output_bfd,
2994 (htab->sgotplt->output_section->vma
2995 + htab->sgotplt->output_offset
2996 + got_offset),
2997 htab->splt->contents + h->plt.offset + 2);
2998 }
2999 else
3000 {
3001 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3002 PLT_ENTRY_SIZE);
3003 bfd_put_32 (output_bfd, got_offset,
3004 htab->splt->contents + h->plt.offset + 2);
3005 }
3006
3007 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3008 htab->splt->contents + h->plt.offset + 7);
3009 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3010 htab->splt->contents + h->plt.offset + 12);
3011
3012 /* Fill in the entry in the global offset table. */
3013 bfd_put_32 (output_bfd,
3014 (htab->splt->output_section->vma
3015 + htab->splt->output_offset
3016 + h->plt.offset
3017 + 6),
3018 htab->sgotplt->contents + got_offset);
3019
3020 /* Fill in the entry in the .rel.plt section. */
3021 rel.r_offset = (htab->sgotplt->output_section->vma
3022 + htab->sgotplt->output_offset
3023 + got_offset);
3024 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3025 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3026 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3027
3028 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3029 {
3030 /* Mark the symbol as undefined, rather than as defined in
3031 the .plt section. Leave the value if there were any
3032 relocations where pointer equality matters (this is a clue
3033 for the dynamic linker, to make function pointer
3034 comparisons work between an application and shared
3035 library), otherwise set it to zero. If a function is only
3036 called from a binary, there is no need to slow down
3037 shared libraries because of that. */
3038 sym->st_shndx = SHN_UNDEF;
3039 if ((h->elf_link_hash_flags & ELF_LINK_POINTER_EQUALITY_NEEDED) == 0)
3040 sym->st_value = 0;
3041 }
3042 }
3043
3044 if (h->got.offset != (bfd_vma) -1
3045 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3046 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3047 {
3048 Elf_Internal_Rela rel;
3049 bfd_byte *loc;
3050
3051 /* This symbol has an entry in the global offset table. Set it
3052 up. */
3053
3054 if (htab->sgot == NULL || htab->srelgot == NULL)
3055 abort ();
3056
3057 rel.r_offset = (htab->sgot->output_section->vma
3058 + htab->sgot->output_offset
3059 + (h->got.offset & ~(bfd_vma) 1));
3060
3061 /* If this is a static link, or it is a -Bsymbolic link and the
3062 symbol is defined locally or was forced to be local because
3063 of a version file, we just want to emit a RELATIVE reloc.
3064 The entry in the global offset table will already have been
3065 initialized in the relocate_section function. */
3066 if (info->shared
3067 && SYMBOL_REFERENCES_LOCAL (info, h))
3068 {
3069 BFD_ASSERT((h->got.offset & 1) != 0);
3070 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3071 }
3072 else
3073 {
3074 BFD_ASSERT((h->got.offset & 1) == 0);
3075 bfd_put_32 (output_bfd, (bfd_vma) 0,
3076 htab->sgot->contents + h->got.offset);
3077 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3078 }
3079
3080 loc = htab->srelgot->contents;
3081 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3082 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3083 }
3084
3085 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3086 {
3087 Elf_Internal_Rela rel;
3088 bfd_byte *loc;
3089
3090 /* This symbol needs a copy reloc. Set it up. */
3091
3092 if (h->dynindx == -1
3093 || (h->root.type != bfd_link_hash_defined
3094 && h->root.type != bfd_link_hash_defweak)
3095 || htab->srelbss == NULL)
3096 abort ();
3097
3098 rel.r_offset = (h->root.u.def.value
3099 + h->root.u.def.section->output_section->vma
3100 + h->root.u.def.section->output_offset);
3101 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3102 loc = htab->srelbss->contents;
3103 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3104 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3105 }
3106
3107 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3108 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3109 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3110 sym->st_shndx = SHN_ABS;
3111
3112 return TRUE;
3113 }
3114
3115 /* Used to decide how to sort relocs in an optimal manner for the
3116 dynamic linker, before writing them out. */
3117
3118 static enum elf_reloc_type_class
3119 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3120 {
3121 switch (ELF32_R_TYPE (rela->r_info))
3122 {
3123 case R_386_RELATIVE:
3124 return reloc_class_relative;
3125 case R_386_JUMP_SLOT:
3126 return reloc_class_plt;
3127 case R_386_COPY:
3128 return reloc_class_copy;
3129 default:
3130 return reloc_class_normal;
3131 }
3132 }
3133
3134 /* Finish up the dynamic sections. */
3135
3136 static bfd_boolean
3137 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3138 struct bfd_link_info *info)
3139 {
3140 struct elf_i386_link_hash_table *htab;
3141 bfd *dynobj;
3142 asection *sdyn;
3143
3144 htab = elf_i386_hash_table (info);
3145 dynobj = htab->elf.dynobj;
3146 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3147
3148 if (htab->elf.dynamic_sections_created)
3149 {
3150 Elf32_External_Dyn *dyncon, *dynconend;
3151
3152 if (sdyn == NULL || htab->sgot == NULL)
3153 abort ();
3154
3155 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3156 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->_raw_size);
3157 for (; dyncon < dynconend; dyncon++)
3158 {
3159 Elf_Internal_Dyn dyn;
3160 asection *s;
3161
3162 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3163
3164 switch (dyn.d_tag)
3165 {
3166 default:
3167 continue;
3168
3169 case DT_PLTGOT:
3170 dyn.d_un.d_ptr = htab->sgot->output_section->vma;
3171 break;
3172
3173 case DT_JMPREL:
3174 s = htab->srelplt;
3175 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3176 break;
3177
3178 case DT_PLTRELSZ:
3179 s = htab->srelplt;
3180 dyn.d_un.d_val = s->_raw_size;
3181 break;
3182
3183 case DT_RELSZ:
3184 /* My reading of the SVR4 ABI indicates that the
3185 procedure linkage table relocs (DT_JMPREL) should be
3186 included in the overall relocs (DT_REL). This is
3187 what Solaris does. However, UnixWare can not handle
3188 that case. Therefore, we override the DT_RELSZ entry
3189 here to make it not include the JMPREL relocs. */
3190 s = htab->srelplt;
3191 if (s == NULL)
3192 continue;
3193 dyn.d_un.d_val -= s->_raw_size;
3194 break;
3195
3196 case DT_REL:
3197 /* We may not be using the standard ELF linker script.
3198 If .rel.plt is the first .rel section, we adjust
3199 DT_REL to not include it. */
3200 s = htab->srelplt;
3201 if (s == NULL)
3202 continue;
3203 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3204 continue;
3205 dyn.d_un.d_ptr += s->_raw_size;
3206 break;
3207 }
3208
3209 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3210 }
3211
3212 /* Fill in the first entry in the procedure linkage table. */
3213 if (htab->splt && htab->splt->_raw_size > 0)
3214 {
3215 if (info->shared)
3216 memcpy (htab->splt->contents,
3217 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
3218 else
3219 {
3220 memcpy (htab->splt->contents,
3221 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
3222 bfd_put_32 (output_bfd,
3223 (htab->sgotplt->output_section->vma
3224 + htab->sgotplt->output_offset
3225 + 4),
3226 htab->splt->contents + 2);
3227 bfd_put_32 (output_bfd,
3228 (htab->sgotplt->output_section->vma
3229 + htab->sgotplt->output_offset
3230 + 8),
3231 htab->splt->contents + 8);
3232 }
3233
3234 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3235 really seem like the right value. */
3236 elf_section_data (htab->splt->output_section)
3237 ->this_hdr.sh_entsize = 4;
3238 }
3239 }
3240
3241 if (htab->sgotplt)
3242 {
3243 /* Fill in the first three entries in the global offset table. */
3244 if (htab->sgotplt->_raw_size > 0)
3245 {
3246 bfd_put_32 (output_bfd,
3247 (sdyn == NULL ? 0
3248 : sdyn->output_section->vma + sdyn->output_offset),
3249 htab->sgotplt->contents);
3250 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3251 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3252 }
3253
3254 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3255 }
3256 return TRUE;
3257 }
3258
3259 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3260 #define TARGET_LITTLE_NAME "elf32-i386"
3261 #define ELF_ARCH bfd_arch_i386
3262 #define ELF_MACHINE_CODE EM_386
3263 #define ELF_MAXPAGESIZE 0x1000
3264
3265 #define elf_backend_can_gc_sections 1
3266 #define elf_backend_can_refcount 1
3267 #define elf_backend_want_got_plt 1
3268 #define elf_backend_plt_readonly 1
3269 #define elf_backend_want_plt_sym 0
3270 #define elf_backend_got_header_size 12
3271
3272 /* Support RELA for objdump of prelink objects. */
3273 #define elf_info_to_howto elf_i386_info_to_howto_rel
3274 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3275
3276 #define bfd_elf32_mkobject elf_i386_mkobject
3277
3278 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3279 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3280 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3281
3282 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3283 #define elf_backend_check_relocs elf_i386_check_relocs
3284 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3285 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3286 #define elf_backend_fake_sections elf_i386_fake_sections
3287 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3288 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3289 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3290 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3291 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3292 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3293 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3294 #define elf_backend_relocate_section elf_i386_relocate_section
3295 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3296
3297 #include "elf32-target.h"
3298
3299 /* FreeBSD support. */
3300
3301 #undef TARGET_LITTLE_SYM
3302 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3303 #undef TARGET_LITTLE_NAME
3304 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3305
3306 /* The kernel recognizes executables as valid only if they carry a
3307 "FreeBSD" label in the ELF header. So we put this label on all
3308 executables and (for simplicity) also all other object files. */
3309
3310 static void
3311 elf_i386_post_process_headers (bfd *abfd,
3312 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3313 {
3314 Elf_Internal_Ehdr *i_ehdrp;
3315
3316 i_ehdrp = elf_elfheader (abfd);
3317
3318 /* Put an ABI label supported by FreeBSD >= 4.1. */
3319 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3320 #ifdef OLD_FREEBSD_ABI_LABEL
3321 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3322 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3323 #endif
3324 }
3325
3326 #undef elf_backend_post_process_headers
3327 #define elf_backend_post_process_headers elf_i386_post_process_headers
3328 #undef elf32_bed
3329 #define elf32_bed elf32_i386_fbsd_bed
3330
3331 #include "elf32-target.h"
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