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* gas/mips/mips16-dwarf2.d: Don't match anything but address and line
[binutils.git] / bfd / elf32-i386.c
blobacb9f1936eed64165d0b75859f7f168729174664
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-vxworks.h"
27
28 /* 386 uses REL relocations instead of RELA. */
29 #define USE_REL 1
30
31 #include "elf/i386.h"
32
33 static reloc_howto_type elf_howto_table[]=
34 {
35 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
36 bfd_elf_generic_reloc, "R_386_NONE",
37 TRUE, 0x00000000, 0x00000000, FALSE),
38 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
39 bfd_elf_generic_reloc, "R_386_32",
40 TRUE, 0xffffffff, 0xffffffff, FALSE),
41 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
42 bfd_elf_generic_reloc, "R_386_PC32",
43 TRUE, 0xffffffff, 0xffffffff, TRUE),
44 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_GOT32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PLT32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_COPY",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
55 TRUE, 0xffffffff, 0xffffffff, FALSE),
56 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_RELATIVE",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_GOTOFF",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_GOTPC",
67 TRUE, 0xffffffff, 0xffffffff, TRUE),
68
69 /* We have a gap in the reloc numbers here.
70 R_386_standard counts the number up to this point, and
71 R_386_ext_offset is the value to subtract from a reloc type of
72 R_386_16 thru R_386_PC8 to form an index into this table. */
73 #define R_386_standard (R_386_GOTPC + 1)
74 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
75
76 /* These relocs are a GNU extension. */
77 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
79 TRUE, 0xffffffff, 0xffffffff, FALSE),
80 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_386_TLS_IE",
82 TRUE, 0xffffffff, 0xffffffff, FALSE),
83 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_LE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GD",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LDM",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_16",
97 TRUE, 0xffff, 0xffff, FALSE),
98 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_PC16",
100 TRUE, 0xffff, 0xffff, TRUE),
101 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_8",
103 TRUE, 0xff, 0xff, FALSE),
104 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_386_PC8",
106 TRUE, 0xff, 0xff, TRUE),
107
108 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
109 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
110 /* These are common with Solaris TLS implementation. */
111 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
113 TRUE, 0xffffffff, 0xffffffff, FALSE),
114 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
116 TRUE, 0xffffffff, 0xffffffff, FALSE),
117 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129
130 /* Another gap. */
131 #define R_386_tls (R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
132 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
133
134 /* GNU extension to record C++ vtable hierarchy. */
135 HOWTO (R_386_GNU_VTINHERIT, /* type */
136 0, /* rightshift */
137 2, /* size (0 = byte, 1 = short, 2 = long) */
138 0, /* bitsize */
139 FALSE, /* pc_relative */
140 0, /* bitpos */
141 complain_overflow_dont, /* complain_on_overflow */
142 NULL, /* special_function */
143 "R_386_GNU_VTINHERIT", /* name */
144 FALSE, /* partial_inplace */
145 0, /* src_mask */
146 0, /* dst_mask */
147 FALSE), /* pcrel_offset */
148
149 /* GNU extension to record C++ vtable member usage. */
150 HOWTO (R_386_GNU_VTENTRY, /* type */
151 0, /* rightshift */
152 2, /* size (0 = byte, 1 = short, 2 = long) */
153 0, /* bitsize */
154 FALSE, /* pc_relative */
155 0, /* bitpos */
156 complain_overflow_dont, /* complain_on_overflow */
157 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
158 "R_386_GNU_VTENTRY", /* name */
159 FALSE, /* partial_inplace */
160 0, /* src_mask */
161 0, /* dst_mask */
162 FALSE) /* pcrel_offset */
163
164 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
165
166 };
167
168 #ifdef DEBUG_GEN_RELOC
169 #define TRACE(str) \
170 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
171 #else
172 #define TRACE(str)
173 #endif
174
175 static reloc_howto_type *
176 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
177 bfd_reloc_code_real_type code)
178 {
179 switch (code)
180 {
181 case BFD_RELOC_NONE:
182 TRACE ("BFD_RELOC_NONE");
183 return &elf_howto_table[R_386_NONE];
184
185 case BFD_RELOC_32:
186 TRACE ("BFD_RELOC_32");
187 return &elf_howto_table[R_386_32];
188
189 case BFD_RELOC_CTOR:
190 TRACE ("BFD_RELOC_CTOR");
191 return &elf_howto_table[R_386_32];
192
193 case BFD_RELOC_32_PCREL:
194 TRACE ("BFD_RELOC_PC32");
195 return &elf_howto_table[R_386_PC32];
196
197 case BFD_RELOC_386_GOT32:
198 TRACE ("BFD_RELOC_386_GOT32");
199 return &elf_howto_table[R_386_GOT32];
200
201 case BFD_RELOC_386_PLT32:
202 TRACE ("BFD_RELOC_386_PLT32");
203 return &elf_howto_table[R_386_PLT32];
204
205 case BFD_RELOC_386_COPY:
206 TRACE ("BFD_RELOC_386_COPY");
207 return &elf_howto_table[R_386_COPY];
208
209 case BFD_RELOC_386_GLOB_DAT:
210 TRACE ("BFD_RELOC_386_GLOB_DAT");
211 return &elf_howto_table[R_386_GLOB_DAT];
212
213 case BFD_RELOC_386_JUMP_SLOT:
214 TRACE ("BFD_RELOC_386_JUMP_SLOT");
215 return &elf_howto_table[R_386_JUMP_SLOT];
216
217 case BFD_RELOC_386_RELATIVE:
218 TRACE ("BFD_RELOC_386_RELATIVE");
219 return &elf_howto_table[R_386_RELATIVE];
220
221 case BFD_RELOC_386_GOTOFF:
222 TRACE ("BFD_RELOC_386_GOTOFF");
223 return &elf_howto_table[R_386_GOTOFF];
224
225 case BFD_RELOC_386_GOTPC:
226 TRACE ("BFD_RELOC_386_GOTPC");
227 return &elf_howto_table[R_386_GOTPC];
228
229 /* These relocs are a GNU extension. */
230 case BFD_RELOC_386_TLS_TPOFF:
231 TRACE ("BFD_RELOC_386_TLS_TPOFF");
232 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
233
234 case BFD_RELOC_386_TLS_IE:
235 TRACE ("BFD_RELOC_386_TLS_IE");
236 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
237
238 case BFD_RELOC_386_TLS_GOTIE:
239 TRACE ("BFD_RELOC_386_TLS_GOTIE");
240 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
241
242 case BFD_RELOC_386_TLS_LE:
243 TRACE ("BFD_RELOC_386_TLS_LE");
244 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
245
246 case BFD_RELOC_386_TLS_GD:
247 TRACE ("BFD_RELOC_386_TLS_GD");
248 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
249
250 case BFD_RELOC_386_TLS_LDM:
251 TRACE ("BFD_RELOC_386_TLS_LDM");
252 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
253
254 case BFD_RELOC_16:
255 TRACE ("BFD_RELOC_16");
256 return &elf_howto_table[R_386_16 - R_386_ext_offset];
257
258 case BFD_RELOC_16_PCREL:
259 TRACE ("BFD_RELOC_16_PCREL");
260 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
261
262 case BFD_RELOC_8:
263 TRACE ("BFD_RELOC_8");
264 return &elf_howto_table[R_386_8 - R_386_ext_offset];
265
266 case BFD_RELOC_8_PCREL:
267 TRACE ("BFD_RELOC_8_PCREL");
268 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
269
270 /* Common with Sun TLS implementation. */
271 case BFD_RELOC_386_TLS_LDO_32:
272 TRACE ("BFD_RELOC_386_TLS_LDO_32");
273 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
274
275 case BFD_RELOC_386_TLS_IE_32:
276 TRACE ("BFD_RELOC_386_TLS_IE_32");
277 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
278
279 case BFD_RELOC_386_TLS_LE_32:
280 TRACE ("BFD_RELOC_386_TLS_LE_32");
281 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
282
283 case BFD_RELOC_386_TLS_DTPMOD32:
284 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
285 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
286
287 case BFD_RELOC_386_TLS_DTPOFF32:
288 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
289 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
290
291 case BFD_RELOC_386_TLS_TPOFF32:
292 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
293 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
294
295 case BFD_RELOC_VTABLE_INHERIT:
296 TRACE ("BFD_RELOC_VTABLE_INHERIT");
297 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
298
299 case BFD_RELOC_VTABLE_ENTRY:
300 TRACE ("BFD_RELOC_VTABLE_ENTRY");
301 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
302
303 default:
304 break;
305 }
306
307 TRACE ("Unknown");
308 return 0;
309 }
310
311 static void
312 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
313 arelent *cache_ptr,
314 Elf_Internal_Rela *dst)
315 {
316 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
317 unsigned int indx;
318
319 if ((indx = r_type) >= R_386_standard
320 && ((indx = r_type - R_386_ext_offset) - R_386_standard
321 >= R_386_ext - R_386_standard)
322 && ((indx = r_type - R_386_tls_offset) - R_386_ext
323 >= R_386_tls - R_386_ext)
324 && ((indx = r_type - R_386_vt_offset) - R_386_tls
325 >= R_386_vt - R_386_tls))
326 {
327 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
328 abfd, (int) r_type);
329 indx = R_386_NONE;
330 }
331 cache_ptr->howto = &elf_howto_table[indx];
332 }
333
334 /* Return whether a symbol name implies a local label. The UnixWare
335 2.1 cc generates temporary symbols that start with .X, so we
336 recognize them here. FIXME: do other SVR4 compilers also use .X?.
337 If so, we should move the .X recognition into
338 _bfd_elf_is_local_label_name. */
339
340 static bfd_boolean
341 elf_i386_is_local_label_name (bfd *abfd, const char *name)
342 {
343 if (name[0] == '.' && name[1] == 'X')
344 return TRUE;
345
346 return _bfd_elf_is_local_label_name (abfd, name);
347 }
348 \f
349 /* Support for core dump NOTE sections. */
350
351 static bfd_boolean
352 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
353 {
354 int offset;
355 size_t size;
356
357 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
358 {
359 int pr_version = bfd_get_32 (abfd, note->descdata);
360
361 if (pr_version != 1)
362 return FALSE;
363
364 /* pr_cursig */
365 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
366
367 /* pr_pid */
368 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
369
370 /* pr_reg */
371 offset = 28;
372 size = bfd_get_32 (abfd, note->descdata + 8);
373 }
374 else
375 {
376 switch (note->descsz)
377 {
378 default:
379 return FALSE;
380
381 case 144: /* Linux/i386 */
382 /* pr_cursig */
383 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
384
385 /* pr_pid */
386 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
387
388 /* pr_reg */
389 offset = 72;
390 size = 68;
391
392 break;
393 }
394 }
395
396 /* Make a ".reg/999" section. */
397 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
398 size, note->descpos + offset);
399 }
400
401 static bfd_boolean
402 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
403 {
404 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
405 {
406 int pr_version = bfd_get_32 (abfd, note->descdata);
407
408 if (pr_version != 1)
409 return FALSE;
410
411 elf_tdata (abfd)->core_program
412 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
413 elf_tdata (abfd)->core_command
414 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
415 }
416 else
417 {
418 switch (note->descsz)
419 {
420 default:
421 return FALSE;
422
423 case 124: /* Linux/i386 elf_prpsinfo. */
424 elf_tdata (abfd)->core_program
425 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
426 elf_tdata (abfd)->core_command
427 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
428 }
429 }
430
431 /* Note that for some reason, a spurious space is tacked
432 onto the end of the args in some (at least one anyway)
433 implementations, so strip it off if it exists. */
434 {
435 char *command = elf_tdata (abfd)->core_command;
436 int n = strlen (command);
437
438 if (0 < n && command[n - 1] == ' ')
439 command[n - 1] = '\0';
440 }
441
442 return TRUE;
443 }
444 \f
445 /* Functions for the i386 ELF linker.
446
447 In order to gain some understanding of code in this file without
448 knowing all the intricate details of the linker, note the
449 following:
450
451 Functions named elf_i386_* are called by external routines, other
452 functions are only called locally. elf_i386_* functions appear
453 in this file more or less in the order in which they are called
454 from external routines. eg. elf_i386_check_relocs is called
455 early in the link process, elf_i386_finish_dynamic_sections is
456 one of the last functions. */
457
458
459 /* The name of the dynamic interpreter. This is put in the .interp
460 section. */
461
462 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
463
464 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
465 copying dynamic variables from a shared lib into an app's dynbss
466 section, and instead use a dynamic relocation to point into the
467 shared lib. */
468 #define ELIMINATE_COPY_RELOCS 1
469
470 /* The size in bytes of an entry in the procedure linkage table. */
471
472 #define PLT_ENTRY_SIZE 16
473
474 /* The first entry in an absolute procedure linkage table looks like
475 this. See the SVR4 ABI i386 supplement to see how this works.
476 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
477
478 static const bfd_byte elf_i386_plt0_entry[12] =
479 {
480 0xff, 0x35, /* pushl contents of address */
481 0, 0, 0, 0, /* replaced with address of .got + 4. */
482 0xff, 0x25, /* jmp indirect */
483 0, 0, 0, 0 /* replaced with address of .got + 8. */
484 };
485
486 /* Subsequent entries in an absolute procedure linkage table look like
487 this. */
488
489 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
490 {
491 0xff, 0x25, /* jmp indirect */
492 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
493 0x68, /* pushl immediate */
494 0, 0, 0, 0, /* replaced with offset into relocation table. */
495 0xe9, /* jmp relative */
496 0, 0, 0, 0 /* replaced with offset to start of .plt. */
497 };
498
499 /* The first entry in a PIC procedure linkage table look like this.
500 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
501
502 static const bfd_byte elf_i386_pic_plt0_entry[12] =
503 {
504 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
505 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
506 };
507
508 /* Subsequent entries in a PIC procedure linkage table look like this. */
509
510 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
511 {
512 0xff, 0xa3, /* jmp *offset(%ebx) */
513 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
514 0x68, /* pushl immediate */
515 0, 0, 0, 0, /* replaced with offset into relocation table. */
516 0xe9, /* jmp relative */
517 0, 0, 0, 0 /* replaced with offset to start of .plt. */
518 };
519
520 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
521 for the PLTResolve stub and then for each PLT entry. */
522 #define PLTRESOLVE_RELOCS_SHLIB 0
523 #define PLTRESOLVE_RELOCS 2
524 #define PLT_NON_JUMP_SLOT_RELOCS 2
525
526 /* The i386 linker needs to keep track of the number of relocs that it
527 decides to copy as dynamic relocs in check_relocs for each symbol.
528 This is so that it can later discard them if they are found to be
529 unnecessary. We store the information in a field extending the
530 regular ELF linker hash table. */
531
532 struct elf_i386_dyn_relocs
533 {
534 struct elf_i386_dyn_relocs *next;
535
536 /* The input section of the reloc. */
537 asection *sec;
538
539 /* Total number of relocs copied for the input section. */
540 bfd_size_type count;
541
542 /* Number of pc-relative relocs copied for the input section. */
543 bfd_size_type pc_count;
544 };
545
546 /* i386 ELF linker hash entry. */
547
548 struct elf_i386_link_hash_entry
549 {
550 struct elf_link_hash_entry elf;
551
552 /* Track dynamic relocs copied for this symbol. */
553 struct elf_i386_dyn_relocs *dyn_relocs;
554
555 #define GOT_UNKNOWN 0
556 #define GOT_NORMAL 1
557 #define GOT_TLS_GD 2
558 #define GOT_TLS_IE 4
559 #define GOT_TLS_IE_POS 5
560 #define GOT_TLS_IE_NEG 6
561 #define GOT_TLS_IE_BOTH 7
562 unsigned char tls_type;
563 };
564
565 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
566
567 struct elf_i386_obj_tdata
568 {
569 struct elf_obj_tdata root;
570
571 /* tls_type for each local got entry. */
572 char *local_got_tls_type;
573 };
574
575 #define elf_i386_tdata(abfd) \
576 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
577
578 #define elf_i386_local_got_tls_type(abfd) \
579 (elf_i386_tdata (abfd)->local_got_tls_type)
580
581 static bfd_boolean
582 elf_i386_mkobject (bfd *abfd)
583 {
584 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
585 abfd->tdata.any = bfd_zalloc (abfd, amt);
586 if (abfd->tdata.any == NULL)
587 return FALSE;
588 return TRUE;
589 }
590
591 /* i386 ELF linker hash table. */
592
593 struct elf_i386_link_hash_table
594 {
595 struct elf_link_hash_table elf;
596
597 /* Short-cuts to get to dynamic linker sections. */
598 asection *sgot;
599 asection *sgotplt;
600 asection *srelgot;
601 asection *splt;
602 asection *srelplt;
603 asection *sdynbss;
604 asection *srelbss;
605
606 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
607 asection *srelplt2;
608
609 /* Short-cuts to frequently used symbols for VxWorks targets. */
610 struct elf_link_hash_entry *hgot, *hplt;
611
612 /* True if the target system is VxWorks. */
613 int is_vxworks;
614
615 /* Value used to fill the last word of the first plt entry. */
616 bfd_byte plt0_pad_byte;
617
618 union {
619 bfd_signed_vma refcount;
620 bfd_vma offset;
621 } tls_ldm_got;
622
623 /* Small local sym to section mapping cache. */
624 struct sym_sec_cache sym_sec;
625 };
626
627 /* Get the i386 ELF linker hash table from a link_info structure. */
628
629 #define elf_i386_hash_table(p) \
630 ((struct elf_i386_link_hash_table *) ((p)->hash))
631
632 /* Create an entry in an i386 ELF linker hash table. */
633
634 static struct bfd_hash_entry *
635 link_hash_newfunc (struct bfd_hash_entry *entry,
636 struct bfd_hash_table *table,
637 const char *string)
638 {
639 /* Allocate the structure if it has not already been allocated by a
640 subclass. */
641 if (entry == NULL)
642 {
643 entry = bfd_hash_allocate (table,
644 sizeof (struct elf_i386_link_hash_entry));
645 if (entry == NULL)
646 return entry;
647 }
648
649 /* Call the allocation method of the superclass. */
650 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
651 if (entry != NULL)
652 {
653 struct elf_i386_link_hash_entry *eh;
654
655 eh = (struct elf_i386_link_hash_entry *) entry;
656 eh->dyn_relocs = NULL;
657 eh->tls_type = GOT_UNKNOWN;
658 }
659
660 return entry;
661 }
662
663 /* Create an i386 ELF linker hash table. */
664
665 static struct bfd_link_hash_table *
666 elf_i386_link_hash_table_create (bfd *abfd)
667 {
668 struct elf_i386_link_hash_table *ret;
669 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
670
671 ret = bfd_malloc (amt);
672 if (ret == NULL)
673 return NULL;
674
675 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
676 {
677 free (ret);
678 return NULL;
679 }
680
681 ret->sgot = NULL;
682 ret->sgotplt = NULL;
683 ret->srelgot = NULL;
684 ret->splt = NULL;
685 ret->srelplt = NULL;
686 ret->sdynbss = NULL;
687 ret->srelbss = NULL;
688 ret->tls_ldm_got.refcount = 0;
689 ret->sym_sec.abfd = NULL;
690 ret->is_vxworks = 0;
691 ret->srelplt2 = NULL;
692 ret->hgot = NULL;
693 ret->hplt = NULL;
694 ret->plt0_pad_byte = 0;
695
696 return &ret->elf.root;
697 }
698
699 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
700 shortcuts to them in our hash table. */
701
702 static bfd_boolean
703 create_got_section (bfd *dynobj, struct bfd_link_info *info)
704 {
705 struct elf_i386_link_hash_table *htab;
706
707 if (! _bfd_elf_create_got_section (dynobj, info))
708 return FALSE;
709
710 htab = elf_i386_hash_table (info);
711 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
712 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
713 if (!htab->sgot || !htab->sgotplt)
714 abort ();
715
716 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
717 (SEC_ALLOC | SEC_LOAD
718 | SEC_HAS_CONTENTS
719 | SEC_IN_MEMORY
720 | SEC_LINKER_CREATED
721 | SEC_READONLY));
722 if (htab->srelgot == NULL
723 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
724 return FALSE;
725 return TRUE;
726 }
727
728 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
729 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
730 hash table. */
731
732 static bfd_boolean
733 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
734 {
735 struct elf_i386_link_hash_table *htab;
736 asection * s;
737 int flags;
738 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
739
740 htab = elf_i386_hash_table (info);
741 if (!htab->sgot && !create_got_section (dynobj, info))
742 return FALSE;
743
744 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
745 return FALSE;
746
747 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
748 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
749 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
750 if (!info->shared)
751 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
752
753 if (!htab->splt || !htab->srelplt || !htab->sdynbss
754 || (!info->shared && !htab->srelbss))
755 abort ();
756
757 if (htab->is_vxworks && !info->shared)
758 {
759 s = bfd_make_section (dynobj, ".rel.plt.unloaded");
760 flags = (SEC_HAS_CONTENTS | SEC_IN_MEMORY | SEC_READONLY
761 | SEC_LINKER_CREATED);
762 if (s == NULL
763 || ! bfd_set_section_flags (dynobj, s, flags)
764 || ! bfd_set_section_alignment (dynobj, s, bed->s->log_file_align))
765 return FALSE;
766 htab->srelplt2 = s;
767 }
768
769 return TRUE;
770 }
771
772 /* Copy the extra info we tack onto an elf_link_hash_entry. */
773
774 static void
775 elf_i386_copy_indirect_symbol (const struct elf_backend_data *bed,
776 struct elf_link_hash_entry *dir,
777 struct elf_link_hash_entry *ind)
778 {
779 struct elf_i386_link_hash_entry *edir, *eind;
780
781 edir = (struct elf_i386_link_hash_entry *) dir;
782 eind = (struct elf_i386_link_hash_entry *) ind;
783
784 if (eind->dyn_relocs != NULL)
785 {
786 if (edir->dyn_relocs != NULL)
787 {
788 struct elf_i386_dyn_relocs **pp;
789 struct elf_i386_dyn_relocs *p;
790
791 if (ind->root.type == bfd_link_hash_indirect)
792 abort ();
793
794 /* Add reloc counts against the weak sym to the strong sym
795 list. Merge any entries against the same section. */
796 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
797 {
798 struct elf_i386_dyn_relocs *q;
799
800 for (q = edir->dyn_relocs; q != NULL; q = q->next)
801 if (q->sec == p->sec)
802 {
803 q->pc_count += p->pc_count;
804 q->count += p->count;
805 *pp = p->next;
806 break;
807 }
808 if (q == NULL)
809 pp = &p->next;
810 }
811 *pp = edir->dyn_relocs;
812 }
813
814 edir->dyn_relocs = eind->dyn_relocs;
815 eind->dyn_relocs = NULL;
816 }
817
818 if (ind->root.type == bfd_link_hash_indirect
819 && dir->got.refcount <= 0)
820 {
821 edir->tls_type = eind->tls_type;
822 eind->tls_type = GOT_UNKNOWN;
823 }
824
825 if (ELIMINATE_COPY_RELOCS
826 && ind->root.type != bfd_link_hash_indirect
827 && dir->dynamic_adjusted)
828 {
829 /* If called to transfer flags for a weakdef during processing
830 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
831 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
832 dir->ref_dynamic |= ind->ref_dynamic;
833 dir->ref_regular |= ind->ref_regular;
834 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
835 dir->needs_plt |= ind->needs_plt;
836 dir->pointer_equality_needed |= ind->pointer_equality_needed;
837 }
838 else
839 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
840 }
841
842 static int
843 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
844 {
845 if (info->shared)
846 return r_type;
847
848 switch (r_type)
849 {
850 case R_386_TLS_GD:
851 case R_386_TLS_IE_32:
852 if (is_local)
853 return R_386_TLS_LE_32;
854 return R_386_TLS_IE_32;
855 case R_386_TLS_IE:
856 case R_386_TLS_GOTIE:
857 if (is_local)
858 return R_386_TLS_LE_32;
859 return r_type;
860 case R_386_TLS_LDM:
861 return R_386_TLS_LE_32;
862 }
863
864 return r_type;
865 }
866
867 /* Look through the relocs for a section during the first phase, and
868 calculate needed space in the global offset table, procedure linkage
869 table, and dynamic reloc sections. */
870
871 static bfd_boolean
872 elf_i386_check_relocs (bfd *abfd,
873 struct bfd_link_info *info,
874 asection *sec,
875 const Elf_Internal_Rela *relocs)
876 {
877 struct elf_i386_link_hash_table *htab;
878 Elf_Internal_Shdr *symtab_hdr;
879 struct elf_link_hash_entry **sym_hashes;
880 const Elf_Internal_Rela *rel;
881 const Elf_Internal_Rela *rel_end;
882 asection *sreloc;
883
884 if (info->relocatable)
885 return TRUE;
886
887 htab = elf_i386_hash_table (info);
888 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
889 sym_hashes = elf_sym_hashes (abfd);
890
891 sreloc = NULL;
892
893 rel_end = relocs + sec->reloc_count;
894 for (rel = relocs; rel < rel_end; rel++)
895 {
896 unsigned int r_type;
897 unsigned long r_symndx;
898 struct elf_link_hash_entry *h;
899
900 r_symndx = ELF32_R_SYM (rel->r_info);
901 r_type = ELF32_R_TYPE (rel->r_info);
902
903 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
904 {
905 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
906 abfd,
907 r_symndx);
908 return FALSE;
909 }
910
911 if (r_symndx < symtab_hdr->sh_info)
912 h = NULL;
913 else
914 {
915 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
916 while (h->root.type == bfd_link_hash_indirect
917 || h->root.type == bfd_link_hash_warning)
918 h = (struct elf_link_hash_entry *) h->root.u.i.link;
919 }
920
921 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
922
923 switch (r_type)
924 {
925 case R_386_TLS_LDM:
926 htab->tls_ldm_got.refcount += 1;
927 goto create_got;
928
929 case R_386_PLT32:
930 /* This symbol requires a procedure linkage table entry. We
931 actually build the entry in adjust_dynamic_symbol,
932 because this might be a case of linking PIC code which is
933 never referenced by a dynamic object, in which case we
934 don't need to generate a procedure linkage table entry
935 after all. */
936
937 /* If this is a local symbol, we resolve it directly without
938 creating a procedure linkage table entry. */
939 if (h == NULL)
940 continue;
941
942 h->needs_plt = 1;
943 h->plt.refcount += 1;
944 break;
945
946 case R_386_TLS_IE_32:
947 case R_386_TLS_IE:
948 case R_386_TLS_GOTIE:
949 if (info->shared)
950 info->flags |= DF_STATIC_TLS;
951 /* Fall through */
952
953 case R_386_GOT32:
954 case R_386_TLS_GD:
955 /* This symbol requires a global offset table entry. */
956 {
957 int tls_type, old_tls_type;
958
959 switch (r_type)
960 {
961 default:
962 case R_386_GOT32: tls_type = GOT_NORMAL; break;
963 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
964 case R_386_TLS_IE_32:
965 if (ELF32_R_TYPE (rel->r_info) == r_type)
966 tls_type = GOT_TLS_IE_NEG;
967 else
968 /* If this is a GD->IE transition, we may use either of
969 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
970 tls_type = GOT_TLS_IE;
971 break;
972 case R_386_TLS_IE:
973 case R_386_TLS_GOTIE:
974 tls_type = GOT_TLS_IE_POS; break;
975 }
976
977 if (h != NULL)
978 {
979 h->got.refcount += 1;
980 old_tls_type = elf_i386_hash_entry(h)->tls_type;
981 }
982 else
983 {
984 bfd_signed_vma *local_got_refcounts;
985
986 /* This is a global offset table entry for a local symbol. */
987 local_got_refcounts = elf_local_got_refcounts (abfd);
988 if (local_got_refcounts == NULL)
989 {
990 bfd_size_type size;
991
992 size = symtab_hdr->sh_info;
993 size *= (sizeof (bfd_signed_vma) + sizeof(char));
994 local_got_refcounts = bfd_zalloc (abfd, size);
995 if (local_got_refcounts == NULL)
996 return FALSE;
997 elf_local_got_refcounts (abfd) = local_got_refcounts;
998 elf_i386_local_got_tls_type (abfd)
999 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
1000 }
1001 local_got_refcounts[r_symndx] += 1;
1002 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1003 }
1004
1005 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1006 tls_type |= old_tls_type;
1007 /* If a TLS symbol is accessed using IE at least once,
1008 there is no point to use dynamic model for it. */
1009 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1010 && (old_tls_type != GOT_TLS_GD
1011 || (tls_type & GOT_TLS_IE) == 0))
1012 {
1013 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
1014 tls_type = old_tls_type;
1015 else
1016 {
1017 (*_bfd_error_handler)
1018 (_("%B: `%s' accessed both as normal and "
1019 "thread local symbol"),
1020 abfd,
1021 h ? h->root.root.string : "<local>");
1022 return FALSE;
1023 }
1024 }
1025
1026 if (old_tls_type != tls_type)
1027 {
1028 if (h != NULL)
1029 elf_i386_hash_entry (h)->tls_type = tls_type;
1030 else
1031 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1032 }
1033 }
1034 /* Fall through */
1035
1036 case R_386_GOTOFF:
1037 case R_386_GOTPC:
1038 create_got:
1039 if (htab->sgot == NULL)
1040 {
1041 if (htab->elf.dynobj == NULL)
1042 htab->elf.dynobj = abfd;
1043 if (!create_got_section (htab->elf.dynobj, info))
1044 return FALSE;
1045 }
1046 if (r_type != R_386_TLS_IE)
1047 break;
1048 /* Fall through */
1049
1050 case R_386_TLS_LE_32:
1051 case R_386_TLS_LE:
1052 if (!info->shared)
1053 break;
1054 info->flags |= DF_STATIC_TLS;
1055 /* Fall through */
1056
1057 case R_386_32:
1058 case R_386_PC32:
1059 if (h != NULL && !info->shared)
1060 {
1061 /* If this reloc is in a read-only section, we might
1062 need a copy reloc. We can't check reliably at this
1063 stage whether the section is read-only, as input
1064 sections have not yet been mapped to output sections.
1065 Tentatively set the flag for now, and correct in
1066 adjust_dynamic_symbol. */
1067 h->non_got_ref = 1;
1068
1069 /* We may need a .plt entry if the function this reloc
1070 refers to is in a shared lib. */
1071 h->plt.refcount += 1;
1072 if (r_type != R_386_PC32)
1073 h->pointer_equality_needed = 1;
1074 }
1075
1076 /* If we are creating a shared library, and this is a reloc
1077 against a global symbol, or a non PC relative reloc
1078 against a local symbol, then we need to copy the reloc
1079 into the shared library. However, if we are linking with
1080 -Bsymbolic, we do not need to copy a reloc against a
1081 global symbol which is defined in an object we are
1082 including in the link (i.e., DEF_REGULAR is set). At
1083 this point we have not seen all the input files, so it is
1084 possible that DEF_REGULAR is not set now but will be set
1085 later (it is never cleared). In case of a weak definition,
1086 DEF_REGULAR may be cleared later by a strong definition in
1087 a shared library. We account for that possibility below by
1088 storing information in the relocs_copied field of the hash
1089 table entry. A similar situation occurs when creating
1090 shared libraries and symbol visibility changes render the
1091 symbol local.
1092
1093 If on the other hand, we are creating an executable, we
1094 may need to keep relocations for symbols satisfied by a
1095 dynamic library if we manage to avoid copy relocs for the
1096 symbol. */
1097 if ((info->shared
1098 && (sec->flags & SEC_ALLOC) != 0
1099 && (r_type != R_386_PC32
1100 || (h != NULL
1101 && (! info->symbolic
1102 || h->root.type == bfd_link_hash_defweak
1103 || !h->def_regular))))
1104 || (ELIMINATE_COPY_RELOCS
1105 && !info->shared
1106 && (sec->flags & SEC_ALLOC) != 0
1107 && h != NULL
1108 && (h->root.type == bfd_link_hash_defweak
1109 || !h->def_regular)))
1110 {
1111 struct elf_i386_dyn_relocs *p;
1112 struct elf_i386_dyn_relocs **head;
1113
1114 /* We must copy these reloc types into the output file.
1115 Create a reloc section in dynobj and make room for
1116 this reloc. */
1117 if (sreloc == NULL)
1118 {
1119 const char *name;
1120 bfd *dynobj;
1121 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1122 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1123
1124 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1125 if (name == NULL)
1126 return FALSE;
1127
1128 if (strncmp (name, ".rel", 4) != 0
1129 || strcmp (bfd_get_section_name (abfd, sec),
1130 name + 4) != 0)
1131 {
1132 (*_bfd_error_handler)
1133 (_("%B: bad relocation section name `%s\'"),
1134 abfd, name);
1135 }
1136
1137 if (htab->elf.dynobj == NULL)
1138 htab->elf.dynobj = abfd;
1139
1140 dynobj = htab->elf.dynobj;
1141 sreloc = bfd_get_section_by_name (dynobj, name);
1142 if (sreloc == NULL)
1143 {
1144 flagword flags;
1145
1146 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1147 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1148 if ((sec->flags & SEC_ALLOC) != 0)
1149 flags |= SEC_ALLOC | SEC_LOAD;
1150 sreloc = bfd_make_section_with_flags (dynobj,
1151 name,
1152 flags);
1153 if (sreloc == NULL
1154 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1155 return FALSE;
1156 }
1157 elf_section_data (sec)->sreloc = sreloc;
1158 }
1159
1160 /* If this is a global symbol, we count the number of
1161 relocations we need for this symbol. */
1162 if (h != NULL)
1163 {
1164 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1165 }
1166 else
1167 {
1168 void **vpp;
1169 /* Track dynamic relocs needed for local syms too.
1170 We really need local syms available to do this
1171 easily. Oh well. */
1172
1173 asection *s;
1174 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1175 sec, r_symndx);
1176 if (s == NULL)
1177 return FALSE;
1178
1179 vpp = &elf_section_data (s)->local_dynrel;
1180 head = (struct elf_i386_dyn_relocs **)vpp;
1181 }
1182
1183 p = *head;
1184 if (p == NULL || p->sec != sec)
1185 {
1186 bfd_size_type amt = sizeof *p;
1187 p = bfd_alloc (htab->elf.dynobj, amt);
1188 if (p == NULL)
1189 return FALSE;
1190 p->next = *head;
1191 *head = p;
1192 p->sec = sec;
1193 p->count = 0;
1194 p->pc_count = 0;
1195 }
1196
1197 p->count += 1;
1198 if (r_type == R_386_PC32)
1199 p->pc_count += 1;
1200 }
1201 break;
1202
1203 /* This relocation describes the C++ object vtable hierarchy.
1204 Reconstruct it for later use during GC. */
1205 case R_386_GNU_VTINHERIT:
1206 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1207 return FALSE;
1208 break;
1209
1210 /* This relocation describes which C++ vtable entries are actually
1211 used. Record for later use during GC. */
1212 case R_386_GNU_VTENTRY:
1213 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1214 return FALSE;
1215 break;
1216
1217 default:
1218 break;
1219 }
1220 }
1221
1222 return TRUE;
1223 }
1224
1225 /* Return the section that should be marked against GC for a given
1226 relocation. */
1227
1228 static asection *
1229 elf_i386_gc_mark_hook (asection *sec,
1230 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1231 Elf_Internal_Rela *rel,
1232 struct elf_link_hash_entry *h,
1233 Elf_Internal_Sym *sym)
1234 {
1235 if (h != NULL)
1236 {
1237 switch (ELF32_R_TYPE (rel->r_info))
1238 {
1239 case R_386_GNU_VTINHERIT:
1240 case R_386_GNU_VTENTRY:
1241 break;
1242
1243 default:
1244 switch (h->root.type)
1245 {
1246 case bfd_link_hash_defined:
1247 case bfd_link_hash_defweak:
1248 return h->root.u.def.section;
1249
1250 case bfd_link_hash_common:
1251 return h->root.u.c.p->section;
1252
1253 default:
1254 break;
1255 }
1256 }
1257 }
1258 else
1259 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1260
1261 return NULL;
1262 }
1263
1264 /* Update the got entry reference counts for the section being removed. */
1265
1266 static bfd_boolean
1267 elf_i386_gc_sweep_hook (bfd *abfd,
1268 struct bfd_link_info *info,
1269 asection *sec,
1270 const Elf_Internal_Rela *relocs)
1271 {
1272 Elf_Internal_Shdr *symtab_hdr;
1273 struct elf_link_hash_entry **sym_hashes;
1274 bfd_signed_vma *local_got_refcounts;
1275 const Elf_Internal_Rela *rel, *relend;
1276
1277 elf_section_data (sec)->local_dynrel = NULL;
1278
1279 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1280 sym_hashes = elf_sym_hashes (abfd);
1281 local_got_refcounts = elf_local_got_refcounts (abfd);
1282
1283 relend = relocs + sec->reloc_count;
1284 for (rel = relocs; rel < relend; rel++)
1285 {
1286 unsigned long r_symndx;
1287 unsigned int r_type;
1288 struct elf_link_hash_entry *h = NULL;
1289
1290 r_symndx = ELF32_R_SYM (rel->r_info);
1291 if (r_symndx >= symtab_hdr->sh_info)
1292 {
1293 struct elf_i386_link_hash_entry *eh;
1294 struct elf_i386_dyn_relocs **pp;
1295 struct elf_i386_dyn_relocs *p;
1296
1297 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1298 while (h->root.type == bfd_link_hash_indirect
1299 || h->root.type == bfd_link_hash_warning)
1300 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1301 eh = (struct elf_i386_link_hash_entry *) h;
1302
1303 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1304 if (p->sec == sec)
1305 {
1306 /* Everything must go for SEC. */
1307 *pp = p->next;
1308 break;
1309 }
1310 }
1311
1312 r_type = ELF32_R_TYPE (rel->r_info);
1313 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1314 switch (r_type)
1315 {
1316 case R_386_TLS_LDM:
1317 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1318 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1319 break;
1320
1321 case R_386_TLS_GD:
1322 case R_386_TLS_IE_32:
1323 case R_386_TLS_IE:
1324 case R_386_TLS_GOTIE:
1325 case R_386_GOT32:
1326 if (h != NULL)
1327 {
1328 if (h->got.refcount > 0)
1329 h->got.refcount -= 1;
1330 }
1331 else if (local_got_refcounts != NULL)
1332 {
1333 if (local_got_refcounts[r_symndx] > 0)
1334 local_got_refcounts[r_symndx] -= 1;
1335 }
1336 break;
1337
1338 case R_386_32:
1339 case R_386_PC32:
1340 if (info->shared)
1341 break;
1342 /* Fall through */
1343
1344 case R_386_PLT32:
1345 if (h != NULL)
1346 {
1347 if (h->plt.refcount > 0)
1348 h->plt.refcount -= 1;
1349 }
1350 break;
1351
1352 default:
1353 break;
1354 }
1355 }
1356
1357 return TRUE;
1358 }
1359
1360 /* Adjust a symbol defined by a dynamic object and referenced by a
1361 regular object. The current definition is in some section of the
1362 dynamic object, but we're not including those sections. We have to
1363 change the definition to something the rest of the link can
1364 understand. */
1365
1366 static bfd_boolean
1367 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1368 struct elf_link_hash_entry *h)
1369 {
1370 struct elf_i386_link_hash_table *htab;
1371 asection *s;
1372 unsigned int power_of_two;
1373
1374 /* If this is a function, put it in the procedure linkage table. We
1375 will fill in the contents of the procedure linkage table later,
1376 when we know the address of the .got section. */
1377 if (h->type == STT_FUNC
1378 || h->needs_plt)
1379 {
1380 if (h->plt.refcount <= 0
1381 || SYMBOL_CALLS_LOCAL (info, h)
1382 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1383 && h->root.type == bfd_link_hash_undefweak))
1384 {
1385 /* This case can occur if we saw a PLT32 reloc in an input
1386 file, but the symbol was never referred to by a dynamic
1387 object, or if all references were garbage collected. In
1388 such a case, we don't actually need to build a procedure
1389 linkage table, and we can just do a PC32 reloc instead. */
1390 h->plt.offset = (bfd_vma) -1;
1391 h->needs_plt = 0;
1392 }
1393
1394 return TRUE;
1395 }
1396 else
1397 /* It's possible that we incorrectly decided a .plt reloc was
1398 needed for an R_386_PC32 reloc to a non-function sym in
1399 check_relocs. We can't decide accurately between function and
1400 non-function syms in check-relocs; Objects loaded later in
1401 the link may change h->type. So fix it now. */
1402 h->plt.offset = (bfd_vma) -1;
1403
1404 /* If this is a weak symbol, and there is a real definition, the
1405 processor independent code will have arranged for us to see the
1406 real definition first, and we can just use the same value. */
1407 if (h->u.weakdef != NULL)
1408 {
1409 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1410 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1411 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1412 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1413 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1414 h->non_got_ref = h->u.weakdef->non_got_ref;
1415 return TRUE;
1416 }
1417
1418 /* This is a reference to a symbol defined by a dynamic object which
1419 is not a function. */
1420
1421 /* If we are creating a shared library, we must presume that the
1422 only references to the symbol are via the global offset table.
1423 For such cases we need not do anything here; the relocations will
1424 be handled correctly by relocate_section. */
1425 if (info->shared)
1426 return TRUE;
1427
1428 /* If there are no references to this symbol that do not use the
1429 GOT, we don't need to generate a copy reloc. */
1430 if (!h->non_got_ref)
1431 return TRUE;
1432
1433 /* If -z nocopyreloc was given, we won't generate them either. */
1434 if (info->nocopyreloc)
1435 {
1436 h->non_got_ref = 0;
1437 return TRUE;
1438 }
1439
1440 htab = elf_i386_hash_table (info);
1441
1442 /* If there aren't any dynamic relocs in read-only sections, then
1443 we can keep the dynamic relocs and avoid the copy reloc. This
1444 doesn't work on VxWorks, where we can not have dynamic relocations
1445 (other than copy and jump slot relocations) in an executable. */
1446 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1447 {
1448 struct elf_i386_link_hash_entry * eh;
1449 struct elf_i386_dyn_relocs *p;
1450
1451 eh = (struct elf_i386_link_hash_entry *) h;
1452 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1453 {
1454 s = p->sec->output_section;
1455 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1456 break;
1457 }
1458
1459 if (p == NULL)
1460 {
1461 h->non_got_ref = 0;
1462 return TRUE;
1463 }
1464 }
1465
1466 if (h->size == 0)
1467 {
1468 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1469 h->root.root.string);
1470 return TRUE;
1471 }
1472
1473 /* We must allocate the symbol in our .dynbss section, which will
1474 become part of the .bss section of the executable. There will be
1475 an entry for this symbol in the .dynsym section. The dynamic
1476 object will contain position independent code, so all references
1477 from the dynamic object to this symbol will go through the global
1478 offset table. The dynamic linker will use the .dynsym entry to
1479 determine the address it must put in the global offset table, so
1480 both the dynamic object and the regular object will refer to the
1481 same memory location for the variable. */
1482
1483 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1484 copy the initial value out of the dynamic object and into the
1485 runtime process image. */
1486 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1487 {
1488 htab->srelbss->size += sizeof (Elf32_External_Rel);
1489 h->needs_copy = 1;
1490 }
1491
1492 /* We need to figure out the alignment required for this symbol. I
1493 have no idea how ELF linkers handle this. */
1494 power_of_two = bfd_log2 (h->size);
1495 if (power_of_two > 3)
1496 power_of_two = 3;
1497
1498 /* Apply the required alignment. */
1499 s = htab->sdynbss;
1500 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1501 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1502 {
1503 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1504 return FALSE;
1505 }
1506
1507 /* Define the symbol as being at this point in the section. */
1508 h->root.u.def.section = s;
1509 h->root.u.def.value = s->size;
1510
1511 /* Increment the section size to make room for the symbol. */
1512 s->size += h->size;
1513
1514 return TRUE;
1515 }
1516
1517 /* Allocate space in .plt, .got and associated reloc sections for
1518 dynamic relocs. */
1519
1520 static bfd_boolean
1521 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1522 {
1523 struct bfd_link_info *info;
1524 struct elf_i386_link_hash_table *htab;
1525 struct elf_i386_link_hash_entry *eh;
1526 struct elf_i386_dyn_relocs *p;
1527
1528 if (h->root.type == bfd_link_hash_indirect)
1529 return TRUE;
1530
1531 if (h->root.type == bfd_link_hash_warning)
1532 /* When warning symbols are created, they **replace** the "real"
1533 entry in the hash table, thus we never get to see the real
1534 symbol in a hash traversal. So look at it now. */
1535 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1536
1537 info = (struct bfd_link_info *) inf;
1538 htab = elf_i386_hash_table (info);
1539
1540 if (htab->elf.dynamic_sections_created
1541 && h->plt.refcount > 0)
1542 {
1543 /* Make sure this symbol is output as a dynamic symbol.
1544 Undefined weak syms won't yet be marked as dynamic. */
1545 if (h->dynindx == -1
1546 && !h->forced_local)
1547 {
1548 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1549 return FALSE;
1550 }
1551
1552 if (info->shared
1553 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1554 {
1555 asection *s = htab->splt;
1556
1557 /* If this is the first .plt entry, make room for the special
1558 first entry. */
1559 if (s->size == 0)
1560 s->size += PLT_ENTRY_SIZE;
1561
1562 h->plt.offset = s->size;
1563
1564 /* If this symbol is not defined in a regular file, and we are
1565 not generating a shared library, then set the symbol to this
1566 location in the .plt. This is required to make function
1567 pointers compare as equal between the normal executable and
1568 the shared library. */
1569 if (! info->shared
1570 && !h->def_regular)
1571 {
1572 h->root.u.def.section = s;
1573 h->root.u.def.value = h->plt.offset;
1574 }
1575
1576 /* Make room for this entry. */
1577 s->size += PLT_ENTRY_SIZE;
1578
1579 /* We also need to make an entry in the .got.plt section, which
1580 will be placed in the .got section by the linker script. */
1581 htab->sgotplt->size += 4;
1582
1583 /* We also need to make an entry in the .rel.plt section. */
1584 htab->srelplt->size += sizeof (Elf32_External_Rel);
1585
1586 if (htab->is_vxworks && !info->shared)
1587 {
1588 /* VxWorks has a second set of relocations for each PLT entry
1589 in executables. They go in a separate relocation section,
1590 which is processed by the kernel loader. */
1591
1592 /* There are two relocations for the initial PLT entry: an
1593 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1594 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1595
1596 if (h->plt.offset == PLT_ENTRY_SIZE)
1597 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1598
1599 /* There are two extra relocations for each subsequent PLT entry:
1600 an R_386_32 relocation for the GOT entry, and an R_386_32
1601 relocation for the PLT entry. */
1602
1603 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1604 }
1605 }
1606 else
1607 {
1608 h->plt.offset = (bfd_vma) -1;
1609 h->needs_plt = 0;
1610 }
1611 }
1612 else
1613 {
1614 h->plt.offset = (bfd_vma) -1;
1615 h->needs_plt = 0;
1616 }
1617
1618 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1619 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1620 if (h->got.refcount > 0
1621 && !info->shared
1622 && h->dynindx == -1
1623 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1624 h->got.offset = (bfd_vma) -1;
1625 else if (h->got.refcount > 0)
1626 {
1627 asection *s;
1628 bfd_boolean dyn;
1629 int tls_type = elf_i386_hash_entry(h)->tls_type;
1630
1631 /* Make sure this symbol is output as a dynamic symbol.
1632 Undefined weak syms won't yet be marked as dynamic. */
1633 if (h->dynindx == -1
1634 && !h->forced_local)
1635 {
1636 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1637 return FALSE;
1638 }
1639
1640 s = htab->sgot;
1641 h->got.offset = s->size;
1642 s->size += 4;
1643 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1644 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1645 s->size += 4;
1646 dyn = htab->elf.dynamic_sections_created;
1647 /* R_386_TLS_IE_32 needs one dynamic relocation,
1648 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1649 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1650 need two), R_386_TLS_GD needs one if local symbol and two if
1651 global. */
1652 if (tls_type == GOT_TLS_IE_BOTH)
1653 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1654 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1655 || (tls_type & GOT_TLS_IE))
1656 htab->srelgot->size += sizeof (Elf32_External_Rel);
1657 else if (tls_type == GOT_TLS_GD)
1658 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1659 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1660 || h->root.type != bfd_link_hash_undefweak)
1661 && (info->shared
1662 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1663 htab->srelgot->size += sizeof (Elf32_External_Rel);
1664 }
1665 else
1666 h->got.offset = (bfd_vma) -1;
1667
1668 eh = (struct elf_i386_link_hash_entry *) h;
1669 if (eh->dyn_relocs == NULL)
1670 return TRUE;
1671
1672 /* In the shared -Bsymbolic case, discard space allocated for
1673 dynamic pc-relative relocs against symbols which turn out to be
1674 defined in regular objects. For the normal shared case, discard
1675 space for pc-relative relocs that have become local due to symbol
1676 visibility changes. */
1677
1678 if (info->shared)
1679 {
1680 /* The only reloc that uses pc_count is R_386_PC32, which will
1681 appear on a call or on something like ".long foo - .". We
1682 want calls to protected symbols to resolve directly to the
1683 function rather than going via the plt. If people want
1684 function pointer comparisons to work as expected then they
1685 should avoid writing assembly like ".long foo - .". */
1686 if (SYMBOL_CALLS_LOCAL (info, h))
1687 {
1688 struct elf_i386_dyn_relocs **pp;
1689
1690 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1691 {
1692 p->count -= p->pc_count;
1693 p->pc_count = 0;
1694 if (p->count == 0)
1695 *pp = p->next;
1696 else
1697 pp = &p->next;
1698 }
1699 }
1700
1701 /* Also discard relocs on undefined weak syms with non-default
1702 visibility. */
1703 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1704 && h->root.type == bfd_link_hash_undefweak)
1705 eh->dyn_relocs = NULL;
1706 }
1707 else if (ELIMINATE_COPY_RELOCS)
1708 {
1709 /* For the non-shared case, discard space for relocs against
1710 symbols which turn out to need copy relocs or are not
1711 dynamic. */
1712
1713 if (!h->non_got_ref
1714 && ((h->def_dynamic
1715 && !h->def_regular)
1716 || (htab->elf.dynamic_sections_created
1717 && (h->root.type == bfd_link_hash_undefweak
1718 || h->root.type == bfd_link_hash_undefined))))
1719 {
1720 /* Make sure this symbol is output as a dynamic symbol.
1721 Undefined weak syms won't yet be marked as dynamic. */
1722 if (h->dynindx == -1
1723 && !h->forced_local)
1724 {
1725 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1726 return FALSE;
1727 }
1728
1729 /* If that succeeded, we know we'll be keeping all the
1730 relocs. */
1731 if (h->dynindx != -1)
1732 goto keep;
1733 }
1734
1735 eh->dyn_relocs = NULL;
1736
1737 keep: ;
1738 }
1739
1740 /* Finally, allocate space. */
1741 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1742 {
1743 asection *sreloc = elf_section_data (p->sec)->sreloc;
1744 sreloc->size += p->count * sizeof (Elf32_External_Rel);
1745 }
1746
1747 return TRUE;
1748 }
1749
1750 /* Find any dynamic relocs that apply to read-only sections. */
1751
1752 static bfd_boolean
1753 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1754 {
1755 struct elf_i386_link_hash_entry *eh;
1756 struct elf_i386_dyn_relocs *p;
1757
1758 if (h->root.type == bfd_link_hash_warning)
1759 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1760
1761 eh = (struct elf_i386_link_hash_entry *) h;
1762 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1763 {
1764 asection *s = p->sec->output_section;
1765
1766 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1767 {
1768 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1769
1770 info->flags |= DF_TEXTREL;
1771
1772 /* Not an error, just cut short the traversal. */
1773 return FALSE;
1774 }
1775 }
1776 return TRUE;
1777 }
1778
1779 /* Set the sizes of the dynamic sections. */
1780
1781 static bfd_boolean
1782 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1783 struct bfd_link_info *info)
1784 {
1785 struct elf_i386_link_hash_table *htab;
1786 bfd *dynobj;
1787 asection *s;
1788 bfd_boolean relocs;
1789 bfd *ibfd;
1790
1791 htab = elf_i386_hash_table (info);
1792 dynobj = htab->elf.dynobj;
1793 if (dynobj == NULL)
1794 abort ();
1795
1796 if (htab->elf.dynamic_sections_created)
1797 {
1798 /* Set the contents of the .interp section to the interpreter. */
1799 if (info->executable)
1800 {
1801 s = bfd_get_section_by_name (dynobj, ".interp");
1802 if (s == NULL)
1803 abort ();
1804 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1805 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1806 }
1807 }
1808
1809 /* Set up .got offsets for local syms, and space for local dynamic
1810 relocs. */
1811 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1812 {
1813 bfd_signed_vma *local_got;
1814 bfd_signed_vma *end_local_got;
1815 char *local_tls_type;
1816 bfd_size_type locsymcount;
1817 Elf_Internal_Shdr *symtab_hdr;
1818 asection *srel;
1819
1820 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1821 continue;
1822
1823 for (s = ibfd->sections; s != NULL; s = s->next)
1824 {
1825 struct elf_i386_dyn_relocs *p;
1826
1827 for (p = ((struct elf_i386_dyn_relocs *)
1828 elf_section_data (s)->local_dynrel);
1829 p != NULL;
1830 p = p->next)
1831 {
1832 if (!bfd_is_abs_section (p->sec)
1833 && bfd_is_abs_section (p->sec->output_section))
1834 {
1835 /* Input section has been discarded, either because
1836 it is a copy of a linkonce section or due to
1837 linker script /DISCARD/, so we'll be discarding
1838 the relocs too. */
1839 }
1840 else if (p->count != 0)
1841 {
1842 srel = elf_section_data (p->sec)->sreloc;
1843 srel->size += p->count * sizeof (Elf32_External_Rel);
1844 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1845 info->flags |= DF_TEXTREL;
1846 }
1847 }
1848 }
1849
1850 local_got = elf_local_got_refcounts (ibfd);
1851 if (!local_got)
1852 continue;
1853
1854 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1855 locsymcount = symtab_hdr->sh_info;
1856 end_local_got = local_got + locsymcount;
1857 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1858 s = htab->sgot;
1859 srel = htab->srelgot;
1860 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1861 {
1862 if (*local_got > 0)
1863 {
1864 *local_got = s->size;
1865 s->size += 4;
1866 if (*local_tls_type == GOT_TLS_GD
1867 || *local_tls_type == GOT_TLS_IE_BOTH)
1868 s->size += 4;
1869 if (info->shared
1870 || *local_tls_type == GOT_TLS_GD
1871 || (*local_tls_type & GOT_TLS_IE))
1872 {
1873 if (*local_tls_type == GOT_TLS_IE_BOTH)
1874 srel->size += 2 * sizeof (Elf32_External_Rel);
1875 else
1876 srel->size += sizeof (Elf32_External_Rel);
1877 }
1878 }
1879 else
1880 *local_got = (bfd_vma) -1;
1881 }
1882 }
1883
1884 if (htab->tls_ldm_got.refcount > 0)
1885 {
1886 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1887 relocs. */
1888 htab->tls_ldm_got.offset = htab->sgot->size;
1889 htab->sgot->size += 8;
1890 htab->srelgot->size += sizeof (Elf32_External_Rel);
1891 }
1892 else
1893 htab->tls_ldm_got.offset = -1;
1894
1895 if (htab->is_vxworks)
1896 {
1897 /* Save the GOT and PLT symbols in the hash table for easy access.
1898 Mark them as having relocations; they might not, but we won't
1899 know for sure until we build the GOT in finish_dynamic_symbol. */
1900
1901 htab->hgot = elf_link_hash_lookup (elf_hash_table (info),
1902 "_GLOBAL_OFFSET_TABLE_",
1903 FALSE, FALSE, FALSE);
1904 if (htab->hgot)
1905 htab->hgot->indx = -2;
1906 htab->hplt = elf_link_hash_lookup (elf_hash_table (info),
1907 "_PROCEDURE_LINKAGE_TABLE_",
1908 FALSE, FALSE, FALSE);
1909 if (htab->hplt)
1910 htab->hplt->indx = -2;
1911
1912 if (htab->is_vxworks && htab->hplt && htab->splt->flags & SEC_CODE)
1913 htab->hplt->type = STT_FUNC;
1914 }
1915
1916 /* Allocate global sym .plt and .got entries, and space for global
1917 sym dynamic relocs. */
1918 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1919
1920 /* We now have determined the sizes of the various dynamic sections.
1921 Allocate memory for them. */
1922 relocs = FALSE;
1923 for (s = dynobj->sections; s != NULL; s = s->next)
1924 {
1925 bfd_boolean strip_section = TRUE;
1926
1927 if ((s->flags & SEC_LINKER_CREATED) == 0)
1928 continue;
1929
1930 if (s == htab->splt
1931 || s == htab->sgot
1932 || s == htab->sgotplt
1933 || s == htab->sdynbss)
1934 {
1935 /* Strip this section if we don't need it; see the
1936 comment below. */
1937 /* We'd like to strip these sections if they aren't needed, but if
1938 we've exported dynamic symbols from them we must leave them.
1939 It's too late to tell BFD to get rid of the symbols. */
1940
1941 if (htab->hplt != NULL)
1942 strip_section = FALSE;
1943 }
1944 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1945 {
1946 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
1947 relocs = TRUE;
1948
1949 /* We use the reloc_count field as a counter if we need
1950 to copy relocs into the output file. */
1951 s->reloc_count = 0;
1952 }
1953 else
1954 {
1955 /* It's not one of our sections, so don't allocate space. */
1956 continue;
1957 }
1958
1959 if (s->size == 0)
1960 {
1961 /* If we don't need this section, strip it from the
1962 output file. This is mostly to handle .rel.bss and
1963 .rel.plt. We must create both sections in
1964 create_dynamic_sections, because they must be created
1965 before the linker maps input sections to output
1966 sections. The linker does that before
1967 adjust_dynamic_symbol is called, and it is that
1968 function which decides whether anything needs to go
1969 into these sections. */
1970 if (strip_section)
1971 s->flags |= SEC_EXCLUDE;
1972 continue;
1973 }
1974
1975 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1976 continue;
1977
1978 /* Allocate memory for the section contents. We use bfd_zalloc
1979 here in case unused entries are not reclaimed before the
1980 section's contents are written out. This should not happen,
1981 but this way if it does, we get a R_386_NONE reloc instead
1982 of garbage. */
1983 s->contents = bfd_zalloc (dynobj, s->size);
1984 if (s->contents == NULL)
1985 return FALSE;
1986 }
1987
1988 if (htab->elf.dynamic_sections_created)
1989 {
1990 /* Add some entries to the .dynamic section. We fill in the
1991 values later, in elf_i386_finish_dynamic_sections, but we
1992 must add the entries now so that we get the correct size for
1993 the .dynamic section. The DT_DEBUG entry is filled in by the
1994 dynamic linker and used by the debugger. */
1995 #define add_dynamic_entry(TAG, VAL) \
1996 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1997
1998 if (info->executable)
1999 {
2000 if (!add_dynamic_entry (DT_DEBUG, 0))
2001 return FALSE;
2002 }
2003
2004 if (htab->splt->size != 0)
2005 {
2006 if (!add_dynamic_entry (DT_PLTGOT, 0)
2007 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2008 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2009 || !add_dynamic_entry (DT_JMPREL, 0))
2010 return FALSE;
2011 }
2012
2013 if (relocs)
2014 {
2015 if (!add_dynamic_entry (DT_REL, 0)
2016 || !add_dynamic_entry (DT_RELSZ, 0)
2017 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2018 return FALSE;
2019
2020 /* If any dynamic relocs apply to a read-only section,
2021 then we need a DT_TEXTREL entry. */
2022 if ((info->flags & DF_TEXTREL) == 0)
2023 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2024 (PTR) info);
2025
2026 if ((info->flags & DF_TEXTREL) != 0)
2027 {
2028 if (!add_dynamic_entry (DT_TEXTREL, 0))
2029 return FALSE;
2030 }
2031 }
2032 }
2033 #undef add_dynamic_entry
2034
2035 return TRUE;
2036 }
2037
2038 /* Set the correct type for an x86 ELF section. We do this by the
2039 section name, which is a hack, but ought to work. */
2040
2041 static bfd_boolean
2042 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2043 Elf_Internal_Shdr *hdr,
2044 asection *sec)
2045 {
2046 register const char *name;
2047
2048 name = bfd_get_section_name (abfd, sec);
2049
2050 /* This is an ugly, but unfortunately necessary hack that is
2051 needed when producing EFI binaries on x86. It tells
2052 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2053 containing ELF relocation info. We need this hack in order to
2054 be able to generate ELF binaries that can be translated into
2055 EFI applications (which are essentially COFF objects). Those
2056 files contain a COFF ".reloc" section inside an ELFNN object,
2057 which would normally cause BFD to segfault because it would
2058 attempt to interpret this section as containing relocation
2059 entries for section "oc". With this hack enabled, ".reloc"
2060 will be treated as a normal data section, which will avoid the
2061 segfault. However, you won't be able to create an ELFNN binary
2062 with a section named "oc" that needs relocations, but that's
2063 the kind of ugly side-effects you get when detecting section
2064 types based on their names... In practice, this limitation is
2065 unlikely to bite. */
2066 if (strcmp (name, ".reloc") == 0)
2067 hdr->sh_type = SHT_PROGBITS;
2068
2069 return TRUE;
2070 }
2071
2072 /* Return the base VMA address which should be subtracted from real addresses
2073 when resolving @dtpoff relocation.
2074 This is PT_TLS segment p_vaddr. */
2075
2076 static bfd_vma
2077 dtpoff_base (struct bfd_link_info *info)
2078 {
2079 /* If tls_sec is NULL, we should have signalled an error already. */
2080 if (elf_hash_table (info)->tls_sec == NULL)
2081 return 0;
2082 return elf_hash_table (info)->tls_sec->vma;
2083 }
2084
2085 /* Return the relocation value for @tpoff relocation
2086 if STT_TLS virtual address is ADDRESS. */
2087
2088 static bfd_vma
2089 tpoff (struct bfd_link_info *info, bfd_vma address)
2090 {
2091 struct elf_link_hash_table *htab = elf_hash_table (info);
2092
2093 /* If tls_sec is NULL, we should have signalled an error already. */
2094 if (htab->tls_sec == NULL)
2095 return 0;
2096 return htab->tls_size + htab->tls_sec->vma - address;
2097 }
2098
2099 /* Relocate an i386 ELF section. */
2100
2101 static bfd_boolean
2102 elf_i386_relocate_section (bfd *output_bfd,
2103 struct bfd_link_info *info,
2104 bfd *input_bfd,
2105 asection *input_section,
2106 bfd_byte *contents,
2107 Elf_Internal_Rela *relocs,
2108 Elf_Internal_Sym *local_syms,
2109 asection **local_sections)
2110 {
2111 struct elf_i386_link_hash_table *htab;
2112 Elf_Internal_Shdr *symtab_hdr;
2113 struct elf_link_hash_entry **sym_hashes;
2114 bfd_vma *local_got_offsets;
2115 Elf_Internal_Rela *rel;
2116 Elf_Internal_Rela *relend;
2117
2118 htab = elf_i386_hash_table (info);
2119 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2120 sym_hashes = elf_sym_hashes (input_bfd);
2121 local_got_offsets = elf_local_got_offsets (input_bfd);
2122
2123 rel = relocs;
2124 relend = relocs + input_section->reloc_count;
2125 for (; rel < relend; rel++)
2126 {
2127 unsigned int r_type;
2128 reloc_howto_type *howto;
2129 unsigned long r_symndx;
2130 struct elf_link_hash_entry *h;
2131 Elf_Internal_Sym *sym;
2132 asection *sec;
2133 bfd_vma off;
2134 bfd_vma relocation;
2135 bfd_boolean unresolved_reloc;
2136 bfd_reloc_status_type r;
2137 unsigned int indx;
2138 int tls_type;
2139
2140 r_type = ELF32_R_TYPE (rel->r_info);
2141 if (r_type == R_386_GNU_VTINHERIT
2142 || r_type == R_386_GNU_VTENTRY)
2143 continue;
2144
2145 if ((indx = r_type) >= R_386_standard
2146 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2147 >= R_386_ext - R_386_standard)
2148 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2149 >= R_386_tls - R_386_ext))
2150 {
2151 (*_bfd_error_handler)
2152 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2153 input_bfd, input_section, r_type);
2154 bfd_set_error (bfd_error_bad_value);
2155 return FALSE;
2156 }
2157 howto = elf_howto_table + indx;
2158
2159 r_symndx = ELF32_R_SYM (rel->r_info);
2160
2161 if (info->relocatable)
2162 {
2163 bfd_vma val;
2164 bfd_byte *where;
2165
2166 /* This is a relocatable link. We don't have to change
2167 anything, unless the reloc is against a section symbol,
2168 in which case we have to adjust according to where the
2169 section symbol winds up in the output section. */
2170 if (r_symndx >= symtab_hdr->sh_info)
2171 continue;
2172
2173 sym = local_syms + r_symndx;
2174 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2175 continue;
2176
2177 sec = local_sections[r_symndx];
2178 val = sec->output_offset;
2179 if (val == 0)
2180 continue;
2181
2182 where = contents + rel->r_offset;
2183 switch (howto->size)
2184 {
2185 /* FIXME: overflow checks. */
2186 case 0:
2187 val += bfd_get_8 (input_bfd, where);
2188 bfd_put_8 (input_bfd, val, where);
2189 break;
2190 case 1:
2191 val += bfd_get_16 (input_bfd, where);
2192 bfd_put_16 (input_bfd, val, where);
2193 break;
2194 case 2:
2195 val += bfd_get_32 (input_bfd, where);
2196 bfd_put_32 (input_bfd, val, where);
2197 break;
2198 default:
2199 abort ();
2200 }
2201 continue;
2202 }
2203
2204 /* This is a final link. */
2205 h = NULL;
2206 sym = NULL;
2207 sec = NULL;
2208 unresolved_reloc = FALSE;
2209 if (r_symndx < symtab_hdr->sh_info)
2210 {
2211 sym = local_syms + r_symndx;
2212 sec = local_sections[r_symndx];
2213 relocation = (sec->output_section->vma
2214 + sec->output_offset
2215 + sym->st_value);
2216 if ((sec->flags & SEC_MERGE)
2217 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2218 {
2219 asection *msec;
2220 bfd_vma addend;
2221 bfd_byte *where = contents + rel->r_offset;
2222
2223 switch (howto->size)
2224 {
2225 case 0:
2226 addend = bfd_get_8 (input_bfd, where);
2227 if (howto->pc_relative)
2228 {
2229 addend = (addend ^ 0x80) - 0x80;
2230 addend += 1;
2231 }
2232 break;
2233 case 1:
2234 addend = bfd_get_16 (input_bfd, where);
2235 if (howto->pc_relative)
2236 {
2237 addend = (addend ^ 0x8000) - 0x8000;
2238 addend += 2;
2239 }
2240 break;
2241 case 2:
2242 addend = bfd_get_32 (input_bfd, where);
2243 if (howto->pc_relative)
2244 {
2245 addend = (addend ^ 0x80000000) - 0x80000000;
2246 addend += 4;
2247 }
2248 break;
2249 default:
2250 abort ();
2251 }
2252
2253 msec = sec;
2254 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2255 addend -= relocation;
2256 addend += msec->output_section->vma + msec->output_offset;
2257
2258 switch (howto->size)
2259 {
2260 case 0:
2261 /* FIXME: overflow checks. */
2262 if (howto->pc_relative)
2263 addend -= 1;
2264 bfd_put_8 (input_bfd, addend, where);
2265 break;
2266 case 1:
2267 if (howto->pc_relative)
2268 addend -= 2;
2269 bfd_put_16 (input_bfd, addend, where);
2270 break;
2271 case 2:
2272 if (howto->pc_relative)
2273 addend -= 4;
2274 bfd_put_32 (input_bfd, addend, where);
2275 break;
2276 }
2277 }
2278 }
2279 else
2280 {
2281 bfd_boolean warned;
2282
2283 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2284 r_symndx, symtab_hdr, sym_hashes,
2285 h, sec, relocation,
2286 unresolved_reloc, warned);
2287 }
2288
2289 if (r_symndx == 0)
2290 {
2291 /* r_symndx will be zero only for relocs against symbols from
2292 removed linkonce sections, or sections discarded by a linker
2293 script. For these relocs, we just want the section contents
2294 zeroed. Avoid any special processing in the switch below. */
2295 r_type = R_386_NONE;
2296
2297 relocation = 0;
2298 if (howto->pc_relative)
2299 relocation = (input_section->output_section->vma
2300 + input_section->output_offset
2301 + rel->r_offset);
2302 }
2303
2304 switch (r_type)
2305 {
2306 case R_386_GOT32:
2307 /* Relocation is to the entry for this symbol in the global
2308 offset table. */
2309 if (htab->sgot == NULL)
2310 abort ();
2311
2312 if (h != NULL)
2313 {
2314 bfd_boolean dyn;
2315
2316 off = h->got.offset;
2317 dyn = htab->elf.dynamic_sections_created;
2318 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2319 || (info->shared
2320 && SYMBOL_REFERENCES_LOCAL (info, h))
2321 || (ELF_ST_VISIBILITY (h->other)
2322 && h->root.type == bfd_link_hash_undefweak))
2323 {
2324 /* This is actually a static link, or it is a
2325 -Bsymbolic link and the symbol is defined
2326 locally, or the symbol was forced to be local
2327 because of a version file. We must initialize
2328 this entry in the global offset table. Since the
2329 offset must always be a multiple of 4, we use the
2330 least significant bit to record whether we have
2331 initialized it already.
2332
2333 When doing a dynamic link, we create a .rel.got
2334 relocation entry to initialize the value. This
2335 is done in the finish_dynamic_symbol routine. */
2336 if ((off & 1) != 0)
2337 off &= ~1;
2338 else
2339 {
2340 bfd_put_32 (output_bfd, relocation,
2341 htab->sgot->contents + off);
2342 h->got.offset |= 1;
2343 }
2344 }
2345 else
2346 unresolved_reloc = FALSE;
2347 }
2348 else
2349 {
2350 if (local_got_offsets == NULL)
2351 abort ();
2352
2353 off = local_got_offsets[r_symndx];
2354
2355 /* The offset must always be a multiple of 4. We use
2356 the least significant bit to record whether we have
2357 already generated the necessary reloc. */
2358 if ((off & 1) != 0)
2359 off &= ~1;
2360 else
2361 {
2362 bfd_put_32 (output_bfd, relocation,
2363 htab->sgot->contents + off);
2364
2365 if (info->shared)
2366 {
2367 asection *s;
2368 Elf_Internal_Rela outrel;
2369 bfd_byte *loc;
2370
2371 s = htab->srelgot;
2372 if (s == NULL)
2373 abort ();
2374
2375 outrel.r_offset = (htab->sgot->output_section->vma
2376 + htab->sgot->output_offset
2377 + off);
2378 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2379 loc = s->contents;
2380 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2381 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2382 }
2383
2384 local_got_offsets[r_symndx] |= 1;
2385 }
2386 }
2387
2388 if (off >= (bfd_vma) -2)
2389 abort ();
2390
2391 relocation = htab->sgot->output_section->vma
2392 + htab->sgot->output_offset + off
2393 - htab->sgotplt->output_section->vma
2394 - htab->sgotplt->output_offset;
2395 break;
2396
2397 case R_386_GOTOFF:
2398 /* Relocation is relative to the start of the global offset
2399 table. */
2400
2401 /* Check to make sure it isn't a protected function symbol
2402 for shared library since it may not be local when used
2403 as function address. */
2404 if (info->shared
2405 && !info->executable
2406 && h
2407 && h->def_regular
2408 && h->type == STT_FUNC
2409 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2410 {
2411 (*_bfd_error_handler)
2412 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2413 input_bfd, h->root.root.string);
2414 bfd_set_error (bfd_error_bad_value);
2415 return FALSE;
2416 }
2417
2418 /* Note that sgot is not involved in this
2419 calculation. We always want the start of .got.plt. If we
2420 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2421 permitted by the ABI, we might have to change this
2422 calculation. */
2423 relocation -= htab->sgotplt->output_section->vma
2424 + htab->sgotplt->output_offset;
2425 break;
2426
2427 case R_386_GOTPC:
2428 /* Use global offset table as symbol value. */
2429 relocation = htab->sgotplt->output_section->vma
2430 + htab->sgotplt->output_offset;
2431 unresolved_reloc = FALSE;
2432 break;
2433
2434 case R_386_PLT32:
2435 /* Relocation is to the entry for this symbol in the
2436 procedure linkage table. */
2437
2438 /* Resolve a PLT32 reloc against a local symbol directly,
2439 without using the procedure linkage table. */
2440 if (h == NULL)
2441 break;
2442
2443 if (h->plt.offset == (bfd_vma) -1
2444 || htab->splt == NULL)
2445 {
2446 /* We didn't make a PLT entry for this symbol. This
2447 happens when statically linking PIC code, or when
2448 using -Bsymbolic. */
2449 break;
2450 }
2451
2452 relocation = (htab->splt->output_section->vma
2453 + htab->splt->output_offset
2454 + h->plt.offset);
2455 unresolved_reloc = FALSE;
2456 break;
2457
2458 case R_386_32:
2459 case R_386_PC32:
2460 if ((input_section->flags & SEC_ALLOC) == 0)
2461 break;
2462
2463 if ((info->shared
2464 && (h == NULL
2465 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2466 || h->root.type != bfd_link_hash_undefweak)
2467 && (r_type != R_386_PC32
2468 || !SYMBOL_CALLS_LOCAL (info, h)))
2469 || (ELIMINATE_COPY_RELOCS
2470 && !info->shared
2471 && h != NULL
2472 && h->dynindx != -1
2473 && !h->non_got_ref
2474 && ((h->def_dynamic
2475 && !h->def_regular)
2476 || h->root.type == bfd_link_hash_undefweak
2477 || h->root.type == bfd_link_hash_undefined)))
2478 {
2479 Elf_Internal_Rela outrel;
2480 bfd_byte *loc;
2481 bfd_boolean skip, relocate;
2482 asection *sreloc;
2483
2484 /* When generating a shared object, these relocations
2485 are copied into the output file to be resolved at run
2486 time. */
2487
2488 skip = FALSE;
2489 relocate = FALSE;
2490
2491 outrel.r_offset =
2492 _bfd_elf_section_offset (output_bfd, info, input_section,
2493 rel->r_offset);
2494 if (outrel.r_offset == (bfd_vma) -1)
2495 skip = TRUE;
2496 else if (outrel.r_offset == (bfd_vma) -2)
2497 skip = TRUE, relocate = TRUE;
2498 outrel.r_offset += (input_section->output_section->vma
2499 + input_section->output_offset);
2500
2501 if (skip)
2502 memset (&outrel, 0, sizeof outrel);
2503 else if (h != NULL
2504 && h->dynindx != -1
2505 && (r_type == R_386_PC32
2506 || !info->shared
2507 || !info->symbolic
2508 || !h->def_regular))
2509 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2510 else
2511 {
2512 /* This symbol is local, or marked to become local. */
2513 relocate = TRUE;
2514 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2515 }
2516
2517 sreloc = elf_section_data (input_section)->sreloc;
2518 if (sreloc == NULL)
2519 abort ();
2520
2521 loc = sreloc->contents;
2522 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2523 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2524
2525 /* If this reloc is against an external symbol, we do
2526 not want to fiddle with the addend. Otherwise, we
2527 need to include the symbol value so that it becomes
2528 an addend for the dynamic reloc. */
2529 if (! relocate)
2530 continue;
2531 }
2532 break;
2533
2534 case R_386_TLS_IE:
2535 if (info->shared)
2536 {
2537 Elf_Internal_Rela outrel;
2538 bfd_byte *loc;
2539 asection *sreloc;
2540
2541 outrel.r_offset = rel->r_offset
2542 + input_section->output_section->vma
2543 + input_section->output_offset;
2544 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2545 sreloc = elf_section_data (input_section)->sreloc;
2546 if (sreloc == NULL)
2547 abort ();
2548 loc = sreloc->contents;
2549 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2550 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2551 }
2552 /* Fall through */
2553
2554 case R_386_TLS_GD:
2555 case R_386_TLS_IE_32:
2556 case R_386_TLS_GOTIE:
2557 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2558 tls_type = GOT_UNKNOWN;
2559 if (h == NULL && local_got_offsets)
2560 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2561 else if (h != NULL)
2562 {
2563 tls_type = elf_i386_hash_entry(h)->tls_type;
2564 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2565 r_type = R_386_TLS_LE_32;
2566 }
2567 if (tls_type == GOT_TLS_IE)
2568 tls_type = GOT_TLS_IE_NEG;
2569 if (r_type == R_386_TLS_GD)
2570 {
2571 if (tls_type == GOT_TLS_IE_POS)
2572 r_type = R_386_TLS_GOTIE;
2573 else if (tls_type & GOT_TLS_IE)
2574 r_type = R_386_TLS_IE_32;
2575 }
2576
2577 if (r_type == R_386_TLS_LE_32)
2578 {
2579 BFD_ASSERT (! unresolved_reloc);
2580 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2581 {
2582 unsigned int val, type;
2583 bfd_vma roff;
2584
2585 /* GD->LE transition. */
2586 BFD_ASSERT (rel->r_offset >= 2);
2587 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2588 BFD_ASSERT (type == 0x8d || type == 0x04);
2589 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2590 BFD_ASSERT (bfd_get_8 (input_bfd,
2591 contents + rel->r_offset + 4)
2592 == 0xe8);
2593 BFD_ASSERT (rel + 1 < relend);
2594 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2595 roff = rel->r_offset + 5;
2596 val = bfd_get_8 (input_bfd,
2597 contents + rel->r_offset - 1);
2598 if (type == 0x04)
2599 {
2600 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2601 Change it into:
2602 movl %gs:0, %eax; subl $foo@tpoff, %eax
2603 (6 byte form of subl). */
2604 BFD_ASSERT (rel->r_offset >= 3);
2605 BFD_ASSERT (bfd_get_8 (input_bfd,
2606 contents + rel->r_offset - 3)
2607 == 0x8d);
2608 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2609 memcpy (contents + rel->r_offset - 3,
2610 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2611 }
2612 else
2613 {
2614 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2615 if (rel->r_offset + 10 <= input_section->size
2616 && bfd_get_8 (input_bfd,
2617 contents + rel->r_offset + 9) == 0x90)
2618 {
2619 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2620 Change it into:
2621 movl %gs:0, %eax; subl $foo@tpoff, %eax
2622 (6 byte form of subl). */
2623 memcpy (contents + rel->r_offset - 2,
2624 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2625 roff = rel->r_offset + 6;
2626 }
2627 else
2628 {
2629 /* leal foo(%reg), %eax; call ___tls_get_addr
2630 Change it into:
2631 movl %gs:0, %eax; subl $foo@tpoff, %eax
2632 (5 byte form of subl). */
2633 memcpy (contents + rel->r_offset - 2,
2634 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2635 }
2636 }
2637 bfd_put_32 (output_bfd, tpoff (info, relocation),
2638 contents + roff);
2639 /* Skip R_386_PLT32. */
2640 rel++;
2641 continue;
2642 }
2643 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2644 {
2645 unsigned int val, type;
2646
2647 /* IE->LE transition:
2648 Originally it can be one of:
2649 movl foo, %eax
2650 movl foo, %reg
2651 addl foo, %reg
2652 We change it into:
2653 movl $foo, %eax
2654 movl $foo, %reg
2655 addl $foo, %reg. */
2656 BFD_ASSERT (rel->r_offset >= 1);
2657 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2658 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2659 if (val == 0xa1)
2660 {
2661 /* movl foo, %eax. */
2662 bfd_put_8 (output_bfd, 0xb8,
2663 contents + rel->r_offset - 1);
2664 }
2665 else
2666 {
2667 BFD_ASSERT (rel->r_offset >= 2);
2668 type = bfd_get_8 (input_bfd,
2669 contents + rel->r_offset - 2);
2670 switch (type)
2671 {
2672 case 0x8b:
2673 /* movl */
2674 BFD_ASSERT ((val & 0xc7) == 0x05);
2675 bfd_put_8 (output_bfd, 0xc7,
2676 contents + rel->r_offset - 2);
2677 bfd_put_8 (output_bfd,
2678 0xc0 | ((val >> 3) & 7),
2679 contents + rel->r_offset - 1);
2680 break;
2681 case 0x03:
2682 /* addl */
2683 BFD_ASSERT ((val & 0xc7) == 0x05);
2684 bfd_put_8 (output_bfd, 0x81,
2685 contents + rel->r_offset - 2);
2686 bfd_put_8 (output_bfd,
2687 0xc0 | ((val >> 3) & 7),
2688 contents + rel->r_offset - 1);
2689 break;
2690 default:
2691 BFD_FAIL ();
2692 break;
2693 }
2694 }
2695 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2696 contents + rel->r_offset);
2697 continue;
2698 }
2699 else
2700 {
2701 unsigned int val, type;
2702
2703 /* {IE_32,GOTIE}->LE transition:
2704 Originally it can be one of:
2705 subl foo(%reg1), %reg2
2706 movl foo(%reg1), %reg2
2707 addl foo(%reg1), %reg2
2708 We change it into:
2709 subl $foo, %reg2
2710 movl $foo, %reg2 (6 byte form)
2711 addl $foo, %reg2. */
2712 BFD_ASSERT (rel->r_offset >= 2);
2713 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2714 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2715 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2716 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2717 if (type == 0x8b)
2718 {
2719 /* movl */
2720 bfd_put_8 (output_bfd, 0xc7,
2721 contents + rel->r_offset - 2);
2722 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2723 contents + rel->r_offset - 1);
2724 }
2725 else if (type == 0x2b)
2726 {
2727 /* subl */
2728 bfd_put_8 (output_bfd, 0x81,
2729 contents + rel->r_offset - 2);
2730 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2731 contents + rel->r_offset - 1);
2732 }
2733 else if (type == 0x03)
2734 {
2735 /* addl */
2736 bfd_put_8 (output_bfd, 0x81,
2737 contents + rel->r_offset - 2);
2738 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2739 contents + rel->r_offset - 1);
2740 }
2741 else
2742 BFD_FAIL ();
2743 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2744 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2745 contents + rel->r_offset);
2746 else
2747 bfd_put_32 (output_bfd, tpoff (info, relocation),
2748 contents + rel->r_offset);
2749 continue;
2750 }
2751 }
2752
2753 if (htab->sgot == NULL)
2754 abort ();
2755
2756 if (h != NULL)
2757 off = h->got.offset;
2758 else
2759 {
2760 if (local_got_offsets == NULL)
2761 abort ();
2762
2763 off = local_got_offsets[r_symndx];
2764 }
2765
2766 if ((off & 1) != 0)
2767 off &= ~1;
2768 else
2769 {
2770 Elf_Internal_Rela outrel;
2771 bfd_byte *loc;
2772 int dr_type, indx;
2773
2774 if (htab->srelgot == NULL)
2775 abort ();
2776
2777 outrel.r_offset = (htab->sgot->output_section->vma
2778 + htab->sgot->output_offset + off);
2779
2780 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2781 if (r_type == R_386_TLS_GD)
2782 dr_type = R_386_TLS_DTPMOD32;
2783 else if (tls_type == GOT_TLS_IE_POS)
2784 dr_type = R_386_TLS_TPOFF;
2785 else
2786 dr_type = R_386_TLS_TPOFF32;
2787 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2788 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2789 htab->sgot->contents + off);
2790 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2791 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2792 htab->sgot->contents + off);
2793 else
2794 bfd_put_32 (output_bfd, 0,
2795 htab->sgot->contents + off);
2796 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2797 loc = htab->srelgot->contents;
2798 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2799 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2800
2801 if (r_type == R_386_TLS_GD)
2802 {
2803 if (indx == 0)
2804 {
2805 BFD_ASSERT (! unresolved_reloc);
2806 bfd_put_32 (output_bfd,
2807 relocation - dtpoff_base (info),
2808 htab->sgot->contents + off + 4);
2809 }
2810 else
2811 {
2812 bfd_put_32 (output_bfd, 0,
2813 htab->sgot->contents + off + 4);
2814 outrel.r_info = ELF32_R_INFO (indx,
2815 R_386_TLS_DTPOFF32);
2816 outrel.r_offset += 4;
2817 htab->srelgot->reloc_count++;
2818 loc += sizeof (Elf32_External_Rel);
2819 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2820 }
2821 }
2822 else if (tls_type == GOT_TLS_IE_BOTH)
2823 {
2824 bfd_put_32 (output_bfd,
2825 indx == 0 ? relocation - dtpoff_base (info) : 0,
2826 htab->sgot->contents + off + 4);
2827 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2828 outrel.r_offset += 4;
2829 htab->srelgot->reloc_count++;
2830 loc += sizeof (Elf32_External_Rel);
2831 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2832 }
2833
2834 if (h != NULL)
2835 h->got.offset |= 1;
2836 else
2837 local_got_offsets[r_symndx] |= 1;
2838 }
2839
2840 if (off >= (bfd_vma) -2)
2841 abort ();
2842 if (r_type == ELF32_R_TYPE (rel->r_info))
2843 {
2844 bfd_vma g_o_t = htab->sgotplt->output_section->vma
2845 + htab->sgotplt->output_offset;
2846 relocation = htab->sgot->output_section->vma
2847 + htab->sgot->output_offset + off - g_o_t;
2848 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2849 && tls_type == GOT_TLS_IE_BOTH)
2850 relocation += 4;
2851 if (r_type == R_386_TLS_IE)
2852 relocation += g_o_t;
2853 unresolved_reloc = FALSE;
2854 }
2855 else
2856 {
2857 unsigned int val, type;
2858 bfd_vma roff;
2859
2860 /* GD->IE transition. */
2861 BFD_ASSERT (rel->r_offset >= 2);
2862 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2863 BFD_ASSERT (type == 0x8d || type == 0x04);
2864 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2865 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2866 == 0xe8);
2867 BFD_ASSERT (rel + 1 < relend);
2868 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2869 roff = rel->r_offset - 3;
2870 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2871 if (type == 0x04)
2872 {
2873 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2874 Change it into:
2875 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2876 BFD_ASSERT (rel->r_offset >= 3);
2877 BFD_ASSERT (bfd_get_8 (input_bfd,
2878 contents + rel->r_offset - 3)
2879 == 0x8d);
2880 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2881 val >>= 3;
2882 }
2883 else
2884 {
2885 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2886 Change it into:
2887 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2888 BFD_ASSERT (rel->r_offset + 10 <= input_section->size);
2889 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2890 BFD_ASSERT (bfd_get_8 (input_bfd,
2891 contents + rel->r_offset + 9)
2892 == 0x90);
2893 roff = rel->r_offset - 2;
2894 }
2895 memcpy (contents + roff,
2896 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2897 contents[roff + 7] = 0x80 | (val & 7);
2898 /* If foo is used only with foo@gotntpoff(%reg) and
2899 foo@indntpoff, but not with foo@gottpoff(%reg), change
2900 subl $foo@gottpoff(%reg), %eax
2901 into:
2902 addl $foo@gotntpoff(%reg), %eax. */
2903 if (r_type == R_386_TLS_GOTIE)
2904 {
2905 contents[roff + 6] = 0x03;
2906 if (tls_type == GOT_TLS_IE_BOTH)
2907 off += 4;
2908 }
2909 bfd_put_32 (output_bfd,
2910 htab->sgot->output_section->vma
2911 + htab->sgot->output_offset + off
2912 - htab->sgotplt->output_section->vma
2913 - htab->sgotplt->output_offset,
2914 contents + roff + 8);
2915 /* Skip R_386_PLT32. */
2916 rel++;
2917 continue;
2918 }
2919 break;
2920
2921 case R_386_TLS_LDM:
2922 if (! info->shared)
2923 {
2924 unsigned int val;
2925
2926 /* LD->LE transition:
2927 Ensure it is:
2928 leal foo(%reg), %eax; call ___tls_get_addr.
2929 We change it into:
2930 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2931 BFD_ASSERT (rel->r_offset >= 2);
2932 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2933 == 0x8d);
2934 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2935 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2936 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2937 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2938 == 0xe8);
2939 BFD_ASSERT (rel + 1 < relend);
2940 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2941 memcpy (contents + rel->r_offset - 2,
2942 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2943 /* Skip R_386_PLT32. */
2944 rel++;
2945 continue;
2946 }
2947
2948 if (htab->sgot == NULL)
2949 abort ();
2950
2951 off = htab->tls_ldm_got.offset;
2952 if (off & 1)
2953 off &= ~1;
2954 else
2955 {
2956 Elf_Internal_Rela outrel;
2957 bfd_byte *loc;
2958
2959 if (htab->srelgot == NULL)
2960 abort ();
2961
2962 outrel.r_offset = (htab->sgot->output_section->vma
2963 + htab->sgot->output_offset + off);
2964
2965 bfd_put_32 (output_bfd, 0,
2966 htab->sgot->contents + off);
2967 bfd_put_32 (output_bfd, 0,
2968 htab->sgot->contents + off + 4);
2969 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2970 loc = htab->srelgot->contents;
2971 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2972 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2973 htab->tls_ldm_got.offset |= 1;
2974 }
2975 relocation = htab->sgot->output_section->vma
2976 + htab->sgot->output_offset + off
2977 - htab->sgotplt->output_section->vma
2978 - htab->sgotplt->output_offset;
2979 unresolved_reloc = FALSE;
2980 break;
2981
2982 case R_386_TLS_LDO_32:
2983 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2984 relocation -= dtpoff_base (info);
2985 else
2986 /* When converting LDO to LE, we must negate. */
2987 relocation = -tpoff (info, relocation);
2988 break;
2989
2990 case R_386_TLS_LE_32:
2991 case R_386_TLS_LE:
2992 if (info->shared)
2993 {
2994 Elf_Internal_Rela outrel;
2995 asection *sreloc;
2996 bfd_byte *loc;
2997 int indx;
2998
2999 outrel.r_offset = rel->r_offset
3000 + input_section->output_section->vma
3001 + input_section->output_offset;
3002 if (h != NULL && h->dynindx != -1)
3003 indx = h->dynindx;
3004 else
3005 indx = 0;
3006 if (r_type == R_386_TLS_LE_32)
3007 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3008 else
3009 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3010 sreloc = elf_section_data (input_section)->sreloc;
3011 if (sreloc == NULL)
3012 abort ();
3013 loc = sreloc->contents;
3014 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3015 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3016 if (indx)
3017 continue;
3018 else if (r_type == R_386_TLS_LE_32)
3019 relocation = dtpoff_base (info) - relocation;
3020 else
3021 relocation -= dtpoff_base (info);
3022 }
3023 else if (r_type == R_386_TLS_LE_32)
3024 relocation = tpoff (info, relocation);
3025 else
3026 relocation = -tpoff (info, relocation);
3027 break;
3028
3029 default:
3030 break;
3031 }
3032
3033 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3034 because such sections are not SEC_ALLOC and thus ld.so will
3035 not process them. */
3036 if (unresolved_reloc
3037 && !((input_section->flags & SEC_DEBUGGING) != 0
3038 && h->def_dynamic))
3039 {
3040 (*_bfd_error_handler)
3041 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3042 input_bfd,
3043 input_section,
3044 (long) rel->r_offset,
3045 howto->name,
3046 h->root.root.string);
3047 return FALSE;
3048 }
3049
3050 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3051 contents, rel->r_offset,
3052 relocation, 0);
3053
3054 if (r != bfd_reloc_ok)
3055 {
3056 const char *name;
3057
3058 if (h != NULL)
3059 name = h->root.root.string;
3060 else
3061 {
3062 name = bfd_elf_string_from_elf_section (input_bfd,
3063 symtab_hdr->sh_link,
3064 sym->st_name);
3065 if (name == NULL)
3066 return FALSE;
3067 if (*name == '\0')
3068 name = bfd_section_name (input_bfd, sec);
3069 }
3070
3071 if (r == bfd_reloc_overflow)
3072 {
3073 if (! ((*info->callbacks->reloc_overflow)
3074 (info, (h ? &h->root : NULL), name, howto->name,
3075 (bfd_vma) 0, input_bfd, input_section,
3076 rel->r_offset)))
3077 return FALSE;
3078 }
3079 else
3080 {
3081 (*_bfd_error_handler)
3082 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3083 input_bfd, input_section,
3084 (long) rel->r_offset, name, (int) r);
3085 return FALSE;
3086 }
3087 }
3088 }
3089
3090 return TRUE;
3091 }
3092
3093 /* Finish up dynamic symbol handling. We set the contents of various
3094 dynamic sections here. */
3095
3096 static bfd_boolean
3097 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3098 struct bfd_link_info *info,
3099 struct elf_link_hash_entry *h,
3100 Elf_Internal_Sym *sym)
3101 {
3102 struct elf_i386_link_hash_table *htab;
3103
3104 htab = elf_i386_hash_table (info);
3105
3106 if (h->plt.offset != (bfd_vma) -1)
3107 {
3108 bfd_vma plt_index;
3109 bfd_vma got_offset;
3110 Elf_Internal_Rela rel;
3111 bfd_byte *loc;
3112
3113 /* This symbol has an entry in the procedure linkage table. Set
3114 it up. */
3115
3116 if (h->dynindx == -1
3117 || htab->splt == NULL
3118 || htab->sgotplt == NULL
3119 || htab->srelplt == NULL)
3120 abort ();
3121
3122 /* Get the index in the procedure linkage table which
3123 corresponds to this symbol. This is the index of this symbol
3124 in all the symbols for which we are making plt entries. The
3125 first entry in the procedure linkage table is reserved. */
3126 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3127
3128 /* Get the offset into the .got table of the entry that
3129 corresponds to this function. Each .got entry is 4 bytes.
3130 The first three are reserved. */
3131 got_offset = (plt_index + 3) * 4;
3132
3133 /* Fill in the entry in the procedure linkage table. */
3134 if (! info->shared)
3135 {
3136 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3137 PLT_ENTRY_SIZE);
3138 bfd_put_32 (output_bfd,
3139 (htab->sgotplt->output_section->vma
3140 + htab->sgotplt->output_offset
3141 + got_offset),
3142 htab->splt->contents + h->plt.offset + 2);
3143
3144 if (htab->is_vxworks)
3145 {
3146 int s, k, reloc_index;
3147
3148 /* Create the R_386_32 relocation referencing the GOT
3149 for this PLT entry. */
3150
3151 /* S: Current slot number (zero-based). */
3152 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3153 /* K: Number of relocations for PLTResolve. */
3154 if (info->shared)
3155 k = PLTRESOLVE_RELOCS_SHLIB;
3156 else
3157 k = PLTRESOLVE_RELOCS;
3158 /* Skip the PLTresolve relocations, and the relocations for
3159 the other PLT slots. */
3160 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3161 loc = (htab->srelplt2->contents + reloc_index
3162 * sizeof (Elf32_External_Rel));
3163
3164 rel.r_offset = (htab->splt->output_section->vma
3165 + htab->splt->output_offset
3166 + h->plt.offset + 2),
3167 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3168 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3169
3170 /* Create the R_386_32 relocation referencing the beginning of
3171 the PLT for this GOT entry. */
3172 rel.r_offset = (htab->sgotplt->output_section->vma
3173 + htab->sgotplt->output_offset
3174 + got_offset);
3175 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3176 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3177 loc + sizeof (Elf32_External_Rel));
3178 }
3179 }
3180 else
3181 {
3182 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3183 PLT_ENTRY_SIZE);
3184 bfd_put_32 (output_bfd, got_offset,
3185 htab->splt->contents + h->plt.offset + 2);
3186 }
3187
3188 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3189 htab->splt->contents + h->plt.offset + 7);
3190 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3191 htab->splt->contents + h->plt.offset + 12);
3192
3193 /* Fill in the entry in the global offset table. */
3194 bfd_put_32 (output_bfd,
3195 (htab->splt->output_section->vma
3196 + htab->splt->output_offset
3197 + h->plt.offset
3198 + 6),
3199 htab->sgotplt->contents + got_offset);
3200
3201 /* Fill in the entry in the .rel.plt section. */
3202 rel.r_offset = (htab->sgotplt->output_section->vma
3203 + htab->sgotplt->output_offset
3204 + got_offset);
3205 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3206 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3207 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3208
3209 if (!h->def_regular)
3210 {
3211 /* Mark the symbol as undefined, rather than as defined in
3212 the .plt section. Leave the value if there were any
3213 relocations where pointer equality matters (this is a clue
3214 for the dynamic linker, to make function pointer
3215 comparisons work between an application and shared
3216 library), otherwise set it to zero. If a function is only
3217 called from a binary, there is no need to slow down
3218 shared libraries because of that. */
3219 sym->st_shndx = SHN_UNDEF;
3220 if (!h->pointer_equality_needed)
3221 sym->st_value = 0;
3222 }
3223 }
3224
3225 if (h->got.offset != (bfd_vma) -1
3226 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3227 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3228 {
3229 Elf_Internal_Rela rel;
3230 bfd_byte *loc;
3231
3232 /* This symbol has an entry in the global offset table. Set it
3233 up. */
3234
3235 if (htab->sgot == NULL || htab->srelgot == NULL)
3236 abort ();
3237
3238 rel.r_offset = (htab->sgot->output_section->vma
3239 + htab->sgot->output_offset
3240 + (h->got.offset & ~(bfd_vma) 1));
3241
3242 /* If this is a static link, or it is a -Bsymbolic link and the
3243 symbol is defined locally or was forced to be local because
3244 of a version file, we just want to emit a RELATIVE reloc.
3245 The entry in the global offset table will already have been
3246 initialized in the relocate_section function. */
3247 if (info->shared
3248 && SYMBOL_REFERENCES_LOCAL (info, h))
3249 {
3250 BFD_ASSERT((h->got.offset & 1) != 0);
3251 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3252 }
3253 else
3254 {
3255 BFD_ASSERT((h->got.offset & 1) == 0);
3256 bfd_put_32 (output_bfd, (bfd_vma) 0,
3257 htab->sgot->contents + h->got.offset);
3258 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3259 }
3260
3261 loc = htab->srelgot->contents;
3262 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3263 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3264 }
3265
3266 if (h->needs_copy)
3267 {
3268 Elf_Internal_Rela rel;
3269 bfd_byte *loc;
3270
3271 /* This symbol needs a copy reloc. Set it up. */
3272
3273 if (h->dynindx == -1
3274 || (h->root.type != bfd_link_hash_defined
3275 && h->root.type != bfd_link_hash_defweak)
3276 || htab->srelbss == NULL)
3277 abort ();
3278
3279 rel.r_offset = (h->root.u.def.value
3280 + h->root.u.def.section->output_section->vma
3281 + h->root.u.def.section->output_offset);
3282 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3283 loc = htab->srelbss->contents;
3284 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3285 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3286 }
3287
3288 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3289 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3290 is relative to the ".got" section. */
3291 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3292 || (strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3293 && !htab->is_vxworks))
3294 sym->st_shndx = SHN_ABS;
3295
3296 return TRUE;
3297 }
3298
3299 /* Used to decide how to sort relocs in an optimal manner for the
3300 dynamic linker, before writing them out. */
3301
3302 static enum elf_reloc_type_class
3303 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3304 {
3305 switch (ELF32_R_TYPE (rela->r_info))
3306 {
3307 case R_386_RELATIVE:
3308 return reloc_class_relative;
3309 case R_386_JUMP_SLOT:
3310 return reloc_class_plt;
3311 case R_386_COPY:
3312 return reloc_class_copy;
3313 default:
3314 return reloc_class_normal;
3315 }
3316 }
3317
3318 /* Finish up the dynamic sections. */
3319
3320 static bfd_boolean
3321 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3322 struct bfd_link_info *info)
3323 {
3324 struct elf_i386_link_hash_table *htab;
3325 bfd *dynobj;
3326 asection *sdyn;
3327
3328 htab = elf_i386_hash_table (info);
3329 dynobj = htab->elf.dynobj;
3330 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3331
3332 if (htab->elf.dynamic_sections_created)
3333 {
3334 Elf32_External_Dyn *dyncon, *dynconend;
3335
3336 if (sdyn == NULL || htab->sgot == NULL)
3337 abort ();
3338
3339 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3340 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3341 for (; dyncon < dynconend; dyncon++)
3342 {
3343 Elf_Internal_Dyn dyn;
3344 asection *s;
3345
3346 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3347
3348 switch (dyn.d_tag)
3349 {
3350 default:
3351 continue;
3352
3353 case DT_PLTGOT:
3354 s = htab->sgotplt;
3355 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3356 break;
3357
3358 case DT_JMPREL:
3359 s = htab->srelplt;
3360 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3361 break;
3362
3363 case DT_PLTRELSZ:
3364 s = htab->srelplt;
3365 dyn.d_un.d_val = s->size;
3366 break;
3367
3368 case DT_RELSZ:
3369 /* My reading of the SVR4 ABI indicates that the
3370 procedure linkage table relocs (DT_JMPREL) should be
3371 included in the overall relocs (DT_REL). This is
3372 what Solaris does. However, UnixWare can not handle
3373 that case. Therefore, we override the DT_RELSZ entry
3374 here to make it not include the JMPREL relocs. */
3375 s = htab->srelplt;
3376 if (s == NULL)
3377 continue;
3378 dyn.d_un.d_val -= s->size;
3379 break;
3380
3381 case DT_REL:
3382 /* We may not be using the standard ELF linker script.
3383 If .rel.plt is the first .rel section, we adjust
3384 DT_REL to not include it. */
3385 s = htab->srelplt;
3386 if (s == NULL)
3387 continue;
3388 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3389 continue;
3390 dyn.d_un.d_ptr += s->size;
3391 break;
3392 }
3393
3394 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3395 }
3396
3397 /* Fill in the first entry in the procedure linkage table. */
3398 if (htab->splt && htab->splt->size > 0)
3399 {
3400 if (info->shared)
3401 {
3402 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3403 sizeof (elf_i386_pic_plt0_entry));
3404 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3405 htab->plt0_pad_byte,
3406 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3407 }
3408 else
3409 {
3410 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3411 sizeof(elf_i386_plt0_entry));
3412 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3413 htab->plt0_pad_byte,
3414 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3415 bfd_put_32 (output_bfd,
3416 (htab->sgotplt->output_section->vma
3417 + htab->sgotplt->output_offset
3418 + 4),
3419 htab->splt->contents + 2);
3420 bfd_put_32 (output_bfd,
3421 (htab->sgotplt->output_section->vma
3422 + htab->sgotplt->output_offset
3423 + 8),
3424 htab->splt->contents + 8);
3425
3426 if (htab->is_vxworks)
3427 {
3428 Elf_Internal_Rela rel;
3429 struct elf_link_hash_entry *hgot;
3430
3431 /* The VxWorks GOT is relocated by the dynamic linker.
3432 Therefore, we must emit relocations rather than
3433 simply computing the values now. */
3434 hgot = elf_link_hash_lookup (elf_hash_table (info),
3435 "_GLOBAL_OFFSET_TABLE_",
3436 FALSE, FALSE, FALSE);
3437 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3438 On IA32 we use REL relocations so the addend goes in
3439 the PLT directly. */
3440 rel.r_offset = (htab->splt->output_section->vma
3441 + htab->splt->output_offset
3442 + 2);
3443 rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32);
3444 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3445 htab->srelplt2->contents);
3446 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3447 rel.r_offset = (htab->splt->output_section->vma
3448 + htab->splt->output_offset
3449 + 8);
3450 rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32);
3451 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3452 htab->srelplt2->contents +
3453 sizeof (Elf32_External_Rel));
3454 }
3455 }
3456
3457 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3458 really seem like the right value. */
3459 elf_section_data (htab->splt->output_section)
3460 ->this_hdr.sh_entsize = 4;
3461
3462 /* Correct the .rel.plt.unloaded relocations. */
3463 if (htab->is_vxworks && !info->shared)
3464 {
3465 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3466 unsigned char *p;
3467
3468 p = htab->srelplt2->contents;
3469 if (info->shared)
3470 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3471 else
3472 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3473
3474 for (; num_plts; num_plts--)
3475 {
3476 Elf_Internal_Rela rel;
3477 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3478 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3479 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3480 p += sizeof (Elf32_External_Rel);
3481
3482 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3483 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3484 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3485 p += sizeof (Elf32_External_Rel);
3486 }
3487 }
3488 }
3489 }
3490
3491 if (htab->sgotplt)
3492 {
3493 /* Fill in the first three entries in the global offset table. */
3494 if (htab->sgotplt->size > 0)
3495 {
3496 bfd_put_32 (output_bfd,
3497 (sdyn == NULL ? 0
3498 : sdyn->output_section->vma + sdyn->output_offset),
3499 htab->sgotplt->contents);
3500 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3501 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3502 }
3503
3504 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3505 }
3506
3507 if (htab->sgot && htab->sgot->size > 0)
3508 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3509
3510 return TRUE;
3511 }
3512
3513 /* Return address for Ith PLT stub in section PLT, for relocation REL
3514 or (bfd_vma) -1 if it should not be included. */
3515
3516 static bfd_vma
3517 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3518 const arelent *rel ATTRIBUTE_UNUSED)
3519 {
3520 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3521 }
3522
3523
3524 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3525 #define TARGET_LITTLE_NAME "elf32-i386"
3526 #define ELF_ARCH bfd_arch_i386
3527 #define ELF_MACHINE_CODE EM_386
3528 #define ELF_MAXPAGESIZE 0x1000
3529
3530 #define elf_backend_can_gc_sections 1
3531 #define elf_backend_can_refcount 1
3532 #define elf_backend_want_got_plt 1
3533 #define elf_backend_plt_readonly 1
3534 #define elf_backend_want_plt_sym 0
3535 #define elf_backend_got_header_size 12
3536
3537 /* Support RELA for objdump of prelink objects. */
3538 #define elf_info_to_howto elf_i386_info_to_howto_rel
3539 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3540
3541 #define bfd_elf32_mkobject elf_i386_mkobject
3542
3543 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3544 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3545 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3546
3547 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3548 #define elf_backend_check_relocs elf_i386_check_relocs
3549 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3550 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3551 #define elf_backend_fake_sections elf_i386_fake_sections
3552 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3553 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3554 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3555 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3556 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3557 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3558 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3559 #define elf_backend_relocate_section elf_i386_relocate_section
3560 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3561 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
3562
3563 #include "elf32-target.h"
3564
3565 /* FreeBSD support. */
3566
3567 #undef TARGET_LITTLE_SYM
3568 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3569 #undef TARGET_LITTLE_NAME
3570 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3571
3572 /* The kernel recognizes executables as valid only if they carry a
3573 "FreeBSD" label in the ELF header. So we put this label on all
3574 executables and (for simplicity) also all other object files. */
3575
3576 static void
3577 elf_i386_post_process_headers (bfd *abfd,
3578 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3579 {
3580 Elf_Internal_Ehdr *i_ehdrp;
3581
3582 i_ehdrp = elf_elfheader (abfd);
3583
3584 /* Put an ABI label supported by FreeBSD >= 4.1. */
3585 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3586 #ifdef OLD_FREEBSD_ABI_LABEL
3587 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3588 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3589 #endif
3590 }
3591
3592 #undef elf_backend_post_process_headers
3593 #define elf_backend_post_process_headers elf_i386_post_process_headers
3594 #undef elf32_bed
3595 #define elf32_bed elf32_i386_fbsd_bed
3596
3597 #include "elf32-target.h"
3598
3599 /* VxWorks support. */
3600
3601 #undef TARGET_LITTLE_SYM
3602 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
3603 #undef TARGET_LITTLE_NAME
3604 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
3605
3606
3607 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
3608
3609 static struct bfd_link_hash_table *
3610 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
3611 {
3612 struct bfd_link_hash_table *ret;
3613 struct elf_i386_link_hash_table *htab;
3614
3615 ret = elf_i386_link_hash_table_create (abfd);
3616 if (ret)
3617 {
3618 htab = (struct elf_i386_link_hash_table *) ret;
3619 htab->is_vxworks = 1;
3620 htab->plt0_pad_byte = 0x90;
3621 }
3622
3623 return ret;
3624 }
3625
3626
3627 /* Tweak magic VxWorks symbols as they are written to the output file. */
3628 static bfd_boolean
3629 elf_i386_vxworks_link_output_symbol_hook (struct bfd_link_info *info
3630 ATTRIBUTE_UNUSED,
3631 const char *name,
3632 Elf_Internal_Sym *sym,
3633 asection *input_sec ATTRIBUTE_UNUSED,
3634 struct elf_link_hash_entry *h
3635 ATTRIBUTE_UNUSED)
3636 {
3637 /* Ignore the first dummy symbol. */
3638 if (!name)
3639 return TRUE;
3640
3641 return elf_vxworks_link_output_symbol_hook (name, sym);
3642 }
3643
3644 #undef elf_backend_post_process_headers
3645 #undef bfd_elf32_bfd_link_hash_table_create
3646 #define bfd_elf32_bfd_link_hash_table_create \
3647 elf_i386_vxworks_link_hash_table_create
3648 #undef elf_backend_add_symbol_hook
3649 #define elf_backend_add_symbol_hook \
3650 elf_vxworks_add_symbol_hook
3651 #undef elf_backend_link_output_symbol_hook
3652 #define elf_backend_link_output_symbol_hook \
3653 elf_i386_vxworks_link_output_symbol_hook
3654 #undef elf_backend_emit_relocs
3655 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
3656 #undef elf_backend_final_write_processing
3657 #define elf_backend_final_write_processing \
3658 elf_vxworks_final_write_processing
3659
3660 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
3661 define it. */
3662 #undef elf_backend_want_plt_sym
3663 #define elf_backend_want_plt_sym 1
3664
3665 #undef elf32_bed
3666 #define elf32_bed elf32_i386_vxworks_bed
3667
3668 #include "elf32-target.h"
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