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[binutils.git] / bfd / elf32-i386.c
blob061a9cb32d88d6bf70bee1436a1f2ac0489dc67f
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 (struct bfd_link_info *info,
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 /* Add reloc counts against the indirect sym to the direct sym
792 list. Merge any entries against the same section. */
793 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
794 {
795 struct elf_i386_dyn_relocs *q;
796
797 for (q = edir->dyn_relocs; q != NULL; q = q->next)
798 if (q->sec == p->sec)
799 {
800 q->pc_count += p->pc_count;
801 q->count += p->count;
802 *pp = p->next;
803 break;
804 }
805 if (q == NULL)
806 pp = &p->next;
807 }
808 *pp = edir->dyn_relocs;
809 }
810
811 edir->dyn_relocs = eind->dyn_relocs;
812 eind->dyn_relocs = NULL;
813 }
814
815 if (ind->root.type == bfd_link_hash_indirect
816 && dir->got.refcount <= 0)
817 {
818 edir->tls_type = eind->tls_type;
819 eind->tls_type = GOT_UNKNOWN;
820 }
821
822 if (ELIMINATE_COPY_RELOCS
823 && ind->root.type != bfd_link_hash_indirect
824 && dir->dynamic_adjusted)
825 {
826 /* If called to transfer flags for a weakdef during processing
827 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
828 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
829 dir->ref_dynamic |= ind->ref_dynamic;
830 dir->ref_regular |= ind->ref_regular;
831 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
832 dir->needs_plt |= ind->needs_plt;
833 dir->pointer_equality_needed |= ind->pointer_equality_needed;
834 }
835 else
836 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
837 }
838
839 static int
840 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
841 {
842 if (info->shared)
843 return r_type;
844
845 switch (r_type)
846 {
847 case R_386_TLS_GD:
848 case R_386_TLS_IE_32:
849 if (is_local)
850 return R_386_TLS_LE_32;
851 return R_386_TLS_IE_32;
852 case R_386_TLS_IE:
853 case R_386_TLS_GOTIE:
854 if (is_local)
855 return R_386_TLS_LE_32;
856 return r_type;
857 case R_386_TLS_LDM:
858 return R_386_TLS_LE_32;
859 }
860
861 return r_type;
862 }
863
864 /* Look through the relocs for a section during the first phase, and
865 calculate needed space in the global offset table, procedure linkage
866 table, and dynamic reloc sections. */
867
868 static bfd_boolean
869 elf_i386_check_relocs (bfd *abfd,
870 struct bfd_link_info *info,
871 asection *sec,
872 const Elf_Internal_Rela *relocs)
873 {
874 struct elf_i386_link_hash_table *htab;
875 Elf_Internal_Shdr *symtab_hdr;
876 struct elf_link_hash_entry **sym_hashes;
877 const Elf_Internal_Rela *rel;
878 const Elf_Internal_Rela *rel_end;
879 asection *sreloc;
880
881 if (info->relocatable)
882 return TRUE;
883
884 htab = elf_i386_hash_table (info);
885 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
886 sym_hashes = elf_sym_hashes (abfd);
887
888 sreloc = NULL;
889
890 rel_end = relocs + sec->reloc_count;
891 for (rel = relocs; rel < rel_end; rel++)
892 {
893 unsigned int r_type;
894 unsigned long r_symndx;
895 struct elf_link_hash_entry *h;
896
897 r_symndx = ELF32_R_SYM (rel->r_info);
898 r_type = ELF32_R_TYPE (rel->r_info);
899
900 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
901 {
902 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
903 abfd,
904 r_symndx);
905 return FALSE;
906 }
907
908 if (r_symndx < symtab_hdr->sh_info)
909 h = NULL;
910 else
911 {
912 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
913 while (h->root.type == bfd_link_hash_indirect
914 || h->root.type == bfd_link_hash_warning)
915 h = (struct elf_link_hash_entry *) h->root.u.i.link;
916 }
917
918 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
919
920 switch (r_type)
921 {
922 case R_386_TLS_LDM:
923 htab->tls_ldm_got.refcount += 1;
924 goto create_got;
925
926 case R_386_PLT32:
927 /* This symbol requires a procedure linkage table entry. We
928 actually build the entry in adjust_dynamic_symbol,
929 because this might be a case of linking PIC code which is
930 never referenced by a dynamic object, in which case we
931 don't need to generate a procedure linkage table entry
932 after all. */
933
934 /* If this is a local symbol, we resolve it directly without
935 creating a procedure linkage table entry. */
936 if (h == NULL)
937 continue;
938
939 h->needs_plt = 1;
940 h->plt.refcount += 1;
941 break;
942
943 case R_386_TLS_IE_32:
944 case R_386_TLS_IE:
945 case R_386_TLS_GOTIE:
946 if (info->shared)
947 info->flags |= DF_STATIC_TLS;
948 /* Fall through */
949
950 case R_386_GOT32:
951 case R_386_TLS_GD:
952 /* This symbol requires a global offset table entry. */
953 {
954 int tls_type, old_tls_type;
955
956 switch (r_type)
957 {
958 default:
959 case R_386_GOT32: tls_type = GOT_NORMAL; break;
960 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
961 case R_386_TLS_IE_32:
962 if (ELF32_R_TYPE (rel->r_info) == r_type)
963 tls_type = GOT_TLS_IE_NEG;
964 else
965 /* If this is a GD->IE transition, we may use either of
966 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
967 tls_type = GOT_TLS_IE;
968 break;
969 case R_386_TLS_IE:
970 case R_386_TLS_GOTIE:
971 tls_type = GOT_TLS_IE_POS; break;
972 }
973
974 if (h != NULL)
975 {
976 h->got.refcount += 1;
977 old_tls_type = elf_i386_hash_entry(h)->tls_type;
978 }
979 else
980 {
981 bfd_signed_vma *local_got_refcounts;
982
983 /* This is a global offset table entry for a local symbol. */
984 local_got_refcounts = elf_local_got_refcounts (abfd);
985 if (local_got_refcounts == NULL)
986 {
987 bfd_size_type size;
988
989 size = symtab_hdr->sh_info;
990 size *= (sizeof (bfd_signed_vma) + sizeof(char));
991 local_got_refcounts = bfd_zalloc (abfd, size);
992 if (local_got_refcounts == NULL)
993 return FALSE;
994 elf_local_got_refcounts (abfd) = local_got_refcounts;
995 elf_i386_local_got_tls_type (abfd)
996 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
997 }
998 local_got_refcounts[r_symndx] += 1;
999 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1000 }
1001
1002 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1003 tls_type |= old_tls_type;
1004 /* If a TLS symbol is accessed using IE at least once,
1005 there is no point to use dynamic model for it. */
1006 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1007 && (old_tls_type != GOT_TLS_GD
1008 || (tls_type & GOT_TLS_IE) == 0))
1009 {
1010 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
1011 tls_type = old_tls_type;
1012 else
1013 {
1014 (*_bfd_error_handler)
1015 (_("%B: `%s' accessed both as normal and "
1016 "thread local symbol"),
1017 abfd,
1018 h ? h->root.root.string : "<local>");
1019 return FALSE;
1020 }
1021 }
1022
1023 if (old_tls_type != tls_type)
1024 {
1025 if (h != NULL)
1026 elf_i386_hash_entry (h)->tls_type = tls_type;
1027 else
1028 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1029 }
1030 }
1031 /* Fall through */
1032
1033 case R_386_GOTOFF:
1034 case R_386_GOTPC:
1035 create_got:
1036 if (htab->sgot == NULL)
1037 {
1038 if (htab->elf.dynobj == NULL)
1039 htab->elf.dynobj = abfd;
1040 if (!create_got_section (htab->elf.dynobj, info))
1041 return FALSE;
1042 }
1043 if (r_type != R_386_TLS_IE)
1044 break;
1045 /* Fall through */
1046
1047 case R_386_TLS_LE_32:
1048 case R_386_TLS_LE:
1049 if (!info->shared)
1050 break;
1051 info->flags |= DF_STATIC_TLS;
1052 /* Fall through */
1053
1054 case R_386_32:
1055 case R_386_PC32:
1056 if (h != NULL && !info->shared)
1057 {
1058 /* If this reloc is in a read-only section, we might
1059 need a copy reloc. We can't check reliably at this
1060 stage whether the section is read-only, as input
1061 sections have not yet been mapped to output sections.
1062 Tentatively set the flag for now, and correct in
1063 adjust_dynamic_symbol. */
1064 h->non_got_ref = 1;
1065
1066 /* We may need a .plt entry if the function this reloc
1067 refers to is in a shared lib. */
1068 h->plt.refcount += 1;
1069 if (r_type != R_386_PC32)
1070 h->pointer_equality_needed = 1;
1071 }
1072
1073 /* If we are creating a shared library, and this is a reloc
1074 against a global symbol, or a non PC relative reloc
1075 against a local symbol, then we need to copy the reloc
1076 into the shared library. However, if we are linking with
1077 -Bsymbolic, we do not need to copy a reloc against a
1078 global symbol which is defined in an object we are
1079 including in the link (i.e., DEF_REGULAR is set). At
1080 this point we have not seen all the input files, so it is
1081 possible that DEF_REGULAR is not set now but will be set
1082 later (it is never cleared). In case of a weak definition,
1083 DEF_REGULAR may be cleared later by a strong definition in
1084 a shared library. We account for that possibility below by
1085 storing information in the relocs_copied field of the hash
1086 table entry. A similar situation occurs when creating
1087 shared libraries and symbol visibility changes render the
1088 symbol local.
1089
1090 If on the other hand, we are creating an executable, we
1091 may need to keep relocations for symbols satisfied by a
1092 dynamic library if we manage to avoid copy relocs for the
1093 symbol. */
1094 if ((info->shared
1095 && (sec->flags & SEC_ALLOC) != 0
1096 && (r_type != R_386_PC32
1097 || (h != NULL
1098 && (! info->symbolic
1099 || h->root.type == bfd_link_hash_defweak
1100 || !h->def_regular))))
1101 || (ELIMINATE_COPY_RELOCS
1102 && !info->shared
1103 && (sec->flags & SEC_ALLOC) != 0
1104 && h != NULL
1105 && (h->root.type == bfd_link_hash_defweak
1106 || !h->def_regular)))
1107 {
1108 struct elf_i386_dyn_relocs *p;
1109 struct elf_i386_dyn_relocs **head;
1110
1111 /* We must copy these reloc types into the output file.
1112 Create a reloc section in dynobj and make room for
1113 this reloc. */
1114 if (sreloc == NULL)
1115 {
1116 const char *name;
1117 bfd *dynobj;
1118 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1119 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1120
1121 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1122 if (name == NULL)
1123 return FALSE;
1124
1125 if (strncmp (name, ".rel", 4) != 0
1126 || strcmp (bfd_get_section_name (abfd, sec),
1127 name + 4) != 0)
1128 {
1129 (*_bfd_error_handler)
1130 (_("%B: bad relocation section name `%s\'"),
1131 abfd, name);
1132 }
1133
1134 if (htab->elf.dynobj == NULL)
1135 htab->elf.dynobj = abfd;
1136
1137 dynobj = htab->elf.dynobj;
1138 sreloc = bfd_get_section_by_name (dynobj, name);
1139 if (sreloc == NULL)
1140 {
1141 flagword flags;
1142
1143 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1144 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1145 if ((sec->flags & SEC_ALLOC) != 0)
1146 flags |= SEC_ALLOC | SEC_LOAD;
1147 sreloc = bfd_make_section_with_flags (dynobj,
1148 name,
1149 flags);
1150 if (sreloc == NULL
1151 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1152 return FALSE;
1153 }
1154 elf_section_data (sec)->sreloc = sreloc;
1155 }
1156
1157 /* If this is a global symbol, we count the number of
1158 relocations we need for this symbol. */
1159 if (h != NULL)
1160 {
1161 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1162 }
1163 else
1164 {
1165 void **vpp;
1166 /* Track dynamic relocs needed for local syms too.
1167 We really need local syms available to do this
1168 easily. Oh well. */
1169
1170 asection *s;
1171 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1172 sec, r_symndx);
1173 if (s == NULL)
1174 return FALSE;
1175
1176 vpp = &elf_section_data (s)->local_dynrel;
1177 head = (struct elf_i386_dyn_relocs **)vpp;
1178 }
1179
1180 p = *head;
1181 if (p == NULL || p->sec != sec)
1182 {
1183 bfd_size_type amt = sizeof *p;
1184 p = bfd_alloc (htab->elf.dynobj, amt);
1185 if (p == NULL)
1186 return FALSE;
1187 p->next = *head;
1188 *head = p;
1189 p->sec = sec;
1190 p->count = 0;
1191 p->pc_count = 0;
1192 }
1193
1194 p->count += 1;
1195 if (r_type == R_386_PC32)
1196 p->pc_count += 1;
1197 }
1198 break;
1199
1200 /* This relocation describes the C++ object vtable hierarchy.
1201 Reconstruct it for later use during GC. */
1202 case R_386_GNU_VTINHERIT:
1203 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1204 return FALSE;
1205 break;
1206
1207 /* This relocation describes which C++ vtable entries are actually
1208 used. Record for later use during GC. */
1209 case R_386_GNU_VTENTRY:
1210 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1211 return FALSE;
1212 break;
1213
1214 default:
1215 break;
1216 }
1217 }
1218
1219 return TRUE;
1220 }
1221
1222 /* Return the section that should be marked against GC for a given
1223 relocation. */
1224
1225 static asection *
1226 elf_i386_gc_mark_hook (asection *sec,
1227 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1228 Elf_Internal_Rela *rel,
1229 struct elf_link_hash_entry *h,
1230 Elf_Internal_Sym *sym)
1231 {
1232 if (h != NULL)
1233 {
1234 switch (ELF32_R_TYPE (rel->r_info))
1235 {
1236 case R_386_GNU_VTINHERIT:
1237 case R_386_GNU_VTENTRY:
1238 break;
1239
1240 default:
1241 switch (h->root.type)
1242 {
1243 case bfd_link_hash_defined:
1244 case bfd_link_hash_defweak:
1245 return h->root.u.def.section;
1246
1247 case bfd_link_hash_common:
1248 return h->root.u.c.p->section;
1249
1250 default:
1251 break;
1252 }
1253 }
1254 }
1255 else
1256 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1257
1258 return NULL;
1259 }
1260
1261 /* Update the got entry reference counts for the section being removed. */
1262
1263 static bfd_boolean
1264 elf_i386_gc_sweep_hook (bfd *abfd,
1265 struct bfd_link_info *info,
1266 asection *sec,
1267 const Elf_Internal_Rela *relocs)
1268 {
1269 Elf_Internal_Shdr *symtab_hdr;
1270 struct elf_link_hash_entry **sym_hashes;
1271 bfd_signed_vma *local_got_refcounts;
1272 const Elf_Internal_Rela *rel, *relend;
1273
1274 elf_section_data (sec)->local_dynrel = NULL;
1275
1276 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1277 sym_hashes = elf_sym_hashes (abfd);
1278 local_got_refcounts = elf_local_got_refcounts (abfd);
1279
1280 relend = relocs + sec->reloc_count;
1281 for (rel = relocs; rel < relend; rel++)
1282 {
1283 unsigned long r_symndx;
1284 unsigned int r_type;
1285 struct elf_link_hash_entry *h = NULL;
1286
1287 r_symndx = ELF32_R_SYM (rel->r_info);
1288 if (r_symndx >= symtab_hdr->sh_info)
1289 {
1290 struct elf_i386_link_hash_entry *eh;
1291 struct elf_i386_dyn_relocs **pp;
1292 struct elf_i386_dyn_relocs *p;
1293
1294 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1295 while (h->root.type == bfd_link_hash_indirect
1296 || h->root.type == bfd_link_hash_warning)
1297 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1298 eh = (struct elf_i386_link_hash_entry *) h;
1299
1300 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1301 if (p->sec == sec)
1302 {
1303 /* Everything must go for SEC. */
1304 *pp = p->next;
1305 break;
1306 }
1307 }
1308
1309 r_type = ELF32_R_TYPE (rel->r_info);
1310 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1311 switch (r_type)
1312 {
1313 case R_386_TLS_LDM:
1314 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1315 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1316 break;
1317
1318 case R_386_TLS_GD:
1319 case R_386_TLS_IE_32:
1320 case R_386_TLS_IE:
1321 case R_386_TLS_GOTIE:
1322 case R_386_GOT32:
1323 if (h != NULL)
1324 {
1325 if (h->got.refcount > 0)
1326 h->got.refcount -= 1;
1327 }
1328 else if (local_got_refcounts != NULL)
1329 {
1330 if (local_got_refcounts[r_symndx] > 0)
1331 local_got_refcounts[r_symndx] -= 1;
1332 }
1333 break;
1334
1335 case R_386_32:
1336 case R_386_PC32:
1337 if (info->shared)
1338 break;
1339 /* Fall through */
1340
1341 case R_386_PLT32:
1342 if (h != NULL)
1343 {
1344 if (h->plt.refcount > 0)
1345 h->plt.refcount -= 1;
1346 }
1347 break;
1348
1349 default:
1350 break;
1351 }
1352 }
1353
1354 return TRUE;
1355 }
1356
1357 /* Adjust a symbol defined by a dynamic object and referenced by a
1358 regular object. The current definition is in some section of the
1359 dynamic object, but we're not including those sections. We have to
1360 change the definition to something the rest of the link can
1361 understand. */
1362
1363 static bfd_boolean
1364 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1365 struct elf_link_hash_entry *h)
1366 {
1367 struct elf_i386_link_hash_table *htab;
1368 asection *s;
1369 unsigned int power_of_two;
1370
1371 /* If this is a function, put it in the procedure linkage table. We
1372 will fill in the contents of the procedure linkage table later,
1373 when we know the address of the .got section. */
1374 if (h->type == STT_FUNC
1375 || h->needs_plt)
1376 {
1377 if (h->plt.refcount <= 0
1378 || SYMBOL_CALLS_LOCAL (info, h)
1379 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1380 && h->root.type == bfd_link_hash_undefweak))
1381 {
1382 /* This case can occur if we saw a PLT32 reloc in an input
1383 file, but the symbol was never referred to by a dynamic
1384 object, or if all references were garbage collected. In
1385 such a case, we don't actually need to build a procedure
1386 linkage table, and we can just do a PC32 reloc instead. */
1387 h->plt.offset = (bfd_vma) -1;
1388 h->needs_plt = 0;
1389 }
1390
1391 return TRUE;
1392 }
1393 else
1394 /* It's possible that we incorrectly decided a .plt reloc was
1395 needed for an R_386_PC32 reloc to a non-function sym in
1396 check_relocs. We can't decide accurately between function and
1397 non-function syms in check-relocs; Objects loaded later in
1398 the link may change h->type. So fix it now. */
1399 h->plt.offset = (bfd_vma) -1;
1400
1401 /* If this is a weak symbol, and there is a real definition, the
1402 processor independent code will have arranged for us to see the
1403 real definition first, and we can just use the same value. */
1404 if (h->u.weakdef != NULL)
1405 {
1406 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1407 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1408 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1409 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1410 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1411 h->non_got_ref = h->u.weakdef->non_got_ref;
1412 return TRUE;
1413 }
1414
1415 /* This is a reference to a symbol defined by a dynamic object which
1416 is not a function. */
1417
1418 /* If we are creating a shared library, we must presume that the
1419 only references to the symbol are via the global offset table.
1420 For such cases we need not do anything here; the relocations will
1421 be handled correctly by relocate_section. */
1422 if (info->shared)
1423 return TRUE;
1424
1425 /* If there are no references to this symbol that do not use the
1426 GOT, we don't need to generate a copy reloc. */
1427 if (!h->non_got_ref)
1428 return TRUE;
1429
1430 /* If -z nocopyreloc was given, we won't generate them either. */
1431 if (info->nocopyreloc)
1432 {
1433 h->non_got_ref = 0;
1434 return TRUE;
1435 }
1436
1437 htab = elf_i386_hash_table (info);
1438
1439 /* If there aren't any dynamic relocs in read-only sections, then
1440 we can keep the dynamic relocs and avoid the copy reloc. This
1441 doesn't work on VxWorks, where we can not have dynamic relocations
1442 (other than copy and jump slot relocations) in an executable. */
1443 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1444 {
1445 struct elf_i386_link_hash_entry * eh;
1446 struct elf_i386_dyn_relocs *p;
1447
1448 eh = (struct elf_i386_link_hash_entry *) h;
1449 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1450 {
1451 s = p->sec->output_section;
1452 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1453 break;
1454 }
1455
1456 if (p == NULL)
1457 {
1458 h->non_got_ref = 0;
1459 return TRUE;
1460 }
1461 }
1462
1463 if (h->size == 0)
1464 {
1465 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1466 h->root.root.string);
1467 return TRUE;
1468 }
1469
1470 /* We must allocate the symbol in our .dynbss section, which will
1471 become part of the .bss section of the executable. There will be
1472 an entry for this symbol in the .dynsym section. The dynamic
1473 object will contain position independent code, so all references
1474 from the dynamic object to this symbol will go through the global
1475 offset table. The dynamic linker will use the .dynsym entry to
1476 determine the address it must put in the global offset table, so
1477 both the dynamic object and the regular object will refer to the
1478 same memory location for the variable. */
1479
1480 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1481 copy the initial value out of the dynamic object and into the
1482 runtime process image. */
1483 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1484 {
1485 htab->srelbss->size += sizeof (Elf32_External_Rel);
1486 h->needs_copy = 1;
1487 }
1488
1489 /* We need to figure out the alignment required for this symbol. I
1490 have no idea how ELF linkers handle this. */
1491 power_of_two = bfd_log2 (h->size);
1492 if (power_of_two > 3)
1493 power_of_two = 3;
1494
1495 /* Apply the required alignment. */
1496 s = htab->sdynbss;
1497 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1498 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1499 {
1500 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1501 return FALSE;
1502 }
1503
1504 /* Define the symbol as being at this point in the section. */
1505 h->root.u.def.section = s;
1506 h->root.u.def.value = s->size;
1507
1508 /* Increment the section size to make room for the symbol. */
1509 s->size += h->size;
1510
1511 return TRUE;
1512 }
1513
1514 /* Allocate space in .plt, .got and associated reloc sections for
1515 dynamic relocs. */
1516
1517 static bfd_boolean
1518 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1519 {
1520 struct bfd_link_info *info;
1521 struct elf_i386_link_hash_table *htab;
1522 struct elf_i386_link_hash_entry *eh;
1523 struct elf_i386_dyn_relocs *p;
1524
1525 if (h->root.type == bfd_link_hash_indirect)
1526 return TRUE;
1527
1528 if (h->root.type == bfd_link_hash_warning)
1529 /* When warning symbols are created, they **replace** the "real"
1530 entry in the hash table, thus we never get to see the real
1531 symbol in a hash traversal. So look at it now. */
1532 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1533
1534 info = (struct bfd_link_info *) inf;
1535 htab = elf_i386_hash_table (info);
1536
1537 if (htab->elf.dynamic_sections_created
1538 && h->plt.refcount > 0)
1539 {
1540 /* Make sure this symbol is output as a dynamic symbol.
1541 Undefined weak syms won't yet be marked as dynamic. */
1542 if (h->dynindx == -1
1543 && !h->forced_local)
1544 {
1545 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1546 return FALSE;
1547 }
1548
1549 if (info->shared
1550 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1551 {
1552 asection *s = htab->splt;
1553
1554 /* If this is the first .plt entry, make room for the special
1555 first entry. */
1556 if (s->size == 0)
1557 s->size += PLT_ENTRY_SIZE;
1558
1559 h->plt.offset = s->size;
1560
1561 /* If this symbol is not defined in a regular file, and we are
1562 not generating a shared library, then set the symbol to this
1563 location in the .plt. This is required to make function
1564 pointers compare as equal between the normal executable and
1565 the shared library. */
1566 if (! info->shared
1567 && !h->def_regular)
1568 {
1569 h->root.u.def.section = s;
1570 h->root.u.def.value = h->plt.offset;
1571 }
1572
1573 /* Make room for this entry. */
1574 s->size += PLT_ENTRY_SIZE;
1575
1576 /* We also need to make an entry in the .got.plt section, which
1577 will be placed in the .got section by the linker script. */
1578 htab->sgotplt->size += 4;
1579
1580 /* We also need to make an entry in the .rel.plt section. */
1581 htab->srelplt->size += sizeof (Elf32_External_Rel);
1582
1583 if (htab->is_vxworks && !info->shared)
1584 {
1585 /* VxWorks has a second set of relocations for each PLT entry
1586 in executables. They go in a separate relocation section,
1587 which is processed by the kernel loader. */
1588
1589 /* There are two relocations for the initial PLT entry: an
1590 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1591 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1592
1593 if (h->plt.offset == PLT_ENTRY_SIZE)
1594 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1595
1596 /* There are two extra relocations for each subsequent PLT entry:
1597 an R_386_32 relocation for the GOT entry, and an R_386_32
1598 relocation for the PLT entry. */
1599
1600 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1601 }
1602 }
1603 else
1604 {
1605 h->plt.offset = (bfd_vma) -1;
1606 h->needs_plt = 0;
1607 }
1608 }
1609 else
1610 {
1611 h->plt.offset = (bfd_vma) -1;
1612 h->needs_plt = 0;
1613 }
1614
1615 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1616 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1617 if (h->got.refcount > 0
1618 && !info->shared
1619 && h->dynindx == -1
1620 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1621 h->got.offset = (bfd_vma) -1;
1622 else if (h->got.refcount > 0)
1623 {
1624 asection *s;
1625 bfd_boolean dyn;
1626 int tls_type = elf_i386_hash_entry(h)->tls_type;
1627
1628 /* Make sure this symbol is output as a dynamic symbol.
1629 Undefined weak syms won't yet be marked as dynamic. */
1630 if (h->dynindx == -1
1631 && !h->forced_local)
1632 {
1633 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1634 return FALSE;
1635 }
1636
1637 s = htab->sgot;
1638 h->got.offset = s->size;
1639 s->size += 4;
1640 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1641 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1642 s->size += 4;
1643 dyn = htab->elf.dynamic_sections_created;
1644 /* R_386_TLS_IE_32 needs one dynamic relocation,
1645 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1646 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1647 need two), R_386_TLS_GD needs one if local symbol and two if
1648 global. */
1649 if (tls_type == GOT_TLS_IE_BOTH)
1650 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1651 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1652 || (tls_type & GOT_TLS_IE))
1653 htab->srelgot->size += sizeof (Elf32_External_Rel);
1654 else if (tls_type == GOT_TLS_GD)
1655 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1656 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1657 || h->root.type != bfd_link_hash_undefweak)
1658 && (info->shared
1659 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1660 htab->srelgot->size += sizeof (Elf32_External_Rel);
1661 }
1662 else
1663 h->got.offset = (bfd_vma) -1;
1664
1665 eh = (struct elf_i386_link_hash_entry *) h;
1666 if (eh->dyn_relocs == NULL)
1667 return TRUE;
1668
1669 /* In the shared -Bsymbolic case, discard space allocated for
1670 dynamic pc-relative relocs against symbols which turn out to be
1671 defined in regular objects. For the normal shared case, discard
1672 space for pc-relative relocs that have become local due to symbol
1673 visibility changes. */
1674
1675 if (info->shared)
1676 {
1677 /* The only reloc that uses pc_count is R_386_PC32, which will
1678 appear on a call or on something like ".long foo - .". We
1679 want calls to protected symbols to resolve directly to the
1680 function rather than going via the plt. If people want
1681 function pointer comparisons to work as expected then they
1682 should avoid writing assembly like ".long foo - .". */
1683 if (SYMBOL_CALLS_LOCAL (info, h))
1684 {
1685 struct elf_i386_dyn_relocs **pp;
1686
1687 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1688 {
1689 p->count -= p->pc_count;
1690 p->pc_count = 0;
1691 if (p->count == 0)
1692 *pp = p->next;
1693 else
1694 pp = &p->next;
1695 }
1696 }
1697
1698 /* Also discard relocs on undefined weak syms with non-default
1699 visibility. */
1700 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1701 && h->root.type == bfd_link_hash_undefweak)
1702 eh->dyn_relocs = NULL;
1703 }
1704 else if (ELIMINATE_COPY_RELOCS)
1705 {
1706 /* For the non-shared case, discard space for relocs against
1707 symbols which turn out to need copy relocs or are not
1708 dynamic. */
1709
1710 if (!h->non_got_ref
1711 && ((h->def_dynamic
1712 && !h->def_regular)
1713 || (htab->elf.dynamic_sections_created
1714 && (h->root.type == bfd_link_hash_undefweak
1715 || h->root.type == bfd_link_hash_undefined))))
1716 {
1717 /* Make sure this symbol is output as a dynamic symbol.
1718 Undefined weak syms won't yet be marked as dynamic. */
1719 if (h->dynindx == -1
1720 && !h->forced_local)
1721 {
1722 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1723 return FALSE;
1724 }
1725
1726 /* If that succeeded, we know we'll be keeping all the
1727 relocs. */
1728 if (h->dynindx != -1)
1729 goto keep;
1730 }
1731
1732 eh->dyn_relocs = NULL;
1733
1734 keep: ;
1735 }
1736
1737 /* Finally, allocate space. */
1738 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1739 {
1740 asection *sreloc = elf_section_data (p->sec)->sreloc;
1741 sreloc->size += p->count * sizeof (Elf32_External_Rel);
1742 }
1743
1744 return TRUE;
1745 }
1746
1747 /* Find any dynamic relocs that apply to read-only sections. */
1748
1749 static bfd_boolean
1750 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1751 {
1752 struct elf_i386_link_hash_entry *eh;
1753 struct elf_i386_dyn_relocs *p;
1754
1755 if (h->root.type == bfd_link_hash_warning)
1756 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1757
1758 eh = (struct elf_i386_link_hash_entry *) h;
1759 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1760 {
1761 asection *s = p->sec->output_section;
1762
1763 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1764 {
1765 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1766
1767 info->flags |= DF_TEXTREL;
1768
1769 /* Not an error, just cut short the traversal. */
1770 return FALSE;
1771 }
1772 }
1773 return TRUE;
1774 }
1775
1776 /* Set the sizes of the dynamic sections. */
1777
1778 static bfd_boolean
1779 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1780 struct bfd_link_info *info)
1781 {
1782 struct elf_i386_link_hash_table *htab;
1783 bfd *dynobj;
1784 asection *s;
1785 bfd_boolean relocs;
1786 bfd *ibfd;
1787
1788 htab = elf_i386_hash_table (info);
1789 dynobj = htab->elf.dynobj;
1790 if (dynobj == NULL)
1791 abort ();
1792
1793 if (htab->elf.dynamic_sections_created)
1794 {
1795 /* Set the contents of the .interp section to the interpreter. */
1796 if (info->executable)
1797 {
1798 s = bfd_get_section_by_name (dynobj, ".interp");
1799 if (s == NULL)
1800 abort ();
1801 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1802 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1803 }
1804 }
1805
1806 /* Set up .got offsets for local syms, and space for local dynamic
1807 relocs. */
1808 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1809 {
1810 bfd_signed_vma *local_got;
1811 bfd_signed_vma *end_local_got;
1812 char *local_tls_type;
1813 bfd_size_type locsymcount;
1814 Elf_Internal_Shdr *symtab_hdr;
1815 asection *srel;
1816
1817 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1818 continue;
1819
1820 for (s = ibfd->sections; s != NULL; s = s->next)
1821 {
1822 struct elf_i386_dyn_relocs *p;
1823
1824 for (p = ((struct elf_i386_dyn_relocs *)
1825 elf_section_data (s)->local_dynrel);
1826 p != NULL;
1827 p = p->next)
1828 {
1829 if (!bfd_is_abs_section (p->sec)
1830 && bfd_is_abs_section (p->sec->output_section))
1831 {
1832 /* Input section has been discarded, either because
1833 it is a copy of a linkonce section or due to
1834 linker script /DISCARD/, so we'll be discarding
1835 the relocs too. */
1836 }
1837 else if (p->count != 0)
1838 {
1839 srel = elf_section_data (p->sec)->sreloc;
1840 srel->size += p->count * sizeof (Elf32_External_Rel);
1841 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1842 info->flags |= DF_TEXTREL;
1843 }
1844 }
1845 }
1846
1847 local_got = elf_local_got_refcounts (ibfd);
1848 if (!local_got)
1849 continue;
1850
1851 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1852 locsymcount = symtab_hdr->sh_info;
1853 end_local_got = local_got + locsymcount;
1854 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1855 s = htab->sgot;
1856 srel = htab->srelgot;
1857 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1858 {
1859 if (*local_got > 0)
1860 {
1861 *local_got = s->size;
1862 s->size += 4;
1863 if (*local_tls_type == GOT_TLS_GD
1864 || *local_tls_type == GOT_TLS_IE_BOTH)
1865 s->size += 4;
1866 if (info->shared
1867 || *local_tls_type == GOT_TLS_GD
1868 || (*local_tls_type & GOT_TLS_IE))
1869 {
1870 if (*local_tls_type == GOT_TLS_IE_BOTH)
1871 srel->size += 2 * sizeof (Elf32_External_Rel);
1872 else
1873 srel->size += sizeof (Elf32_External_Rel);
1874 }
1875 }
1876 else
1877 *local_got = (bfd_vma) -1;
1878 }
1879 }
1880
1881 if (htab->tls_ldm_got.refcount > 0)
1882 {
1883 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1884 relocs. */
1885 htab->tls_ldm_got.offset = htab->sgot->size;
1886 htab->sgot->size += 8;
1887 htab->srelgot->size += sizeof (Elf32_External_Rel);
1888 }
1889 else
1890 htab->tls_ldm_got.offset = -1;
1891
1892 if (htab->is_vxworks)
1893 {
1894 /* Save the GOT and PLT symbols in the hash table for easy access.
1895 Mark them as having relocations; they might not, but we won't
1896 know for sure until we build the GOT in finish_dynamic_symbol. */
1897
1898 htab->hgot = elf_link_hash_lookup (elf_hash_table (info),
1899 "_GLOBAL_OFFSET_TABLE_",
1900 FALSE, FALSE, FALSE);
1901 if (htab->hgot)
1902 htab->hgot->indx = -2;
1903 htab->hplt = elf_link_hash_lookup (elf_hash_table (info),
1904 "_PROCEDURE_LINKAGE_TABLE_",
1905 FALSE, FALSE, FALSE);
1906 if (htab->hplt)
1907 htab->hplt->indx = -2;
1908
1909 if (htab->is_vxworks && htab->hplt && htab->splt->flags & SEC_CODE)
1910 htab->hplt->type = STT_FUNC;
1911 }
1912
1913 /* Allocate global sym .plt and .got entries, and space for global
1914 sym dynamic relocs. */
1915 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1916
1917 /* We now have determined the sizes of the various dynamic sections.
1918 Allocate memory for them. */
1919 relocs = FALSE;
1920 for (s = dynobj->sections; s != NULL; s = s->next)
1921 {
1922 bfd_boolean strip_section = TRUE;
1923
1924 if ((s->flags & SEC_LINKER_CREATED) == 0)
1925 continue;
1926
1927 if (s == htab->splt
1928 || s == htab->sgot
1929 || s == htab->sgotplt
1930 || s == htab->sdynbss)
1931 {
1932 /* Strip this section if we don't need it; see the
1933 comment below. */
1934 /* We'd like to strip these sections if they aren't needed, but if
1935 we've exported dynamic symbols from them we must leave them.
1936 It's too late to tell BFD to get rid of the symbols. */
1937
1938 if (htab->hplt != NULL)
1939 strip_section = FALSE;
1940 }
1941 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1942 {
1943 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
1944 relocs = TRUE;
1945
1946 /* We use the reloc_count field as a counter if we need
1947 to copy relocs into the output file. */
1948 s->reloc_count = 0;
1949 }
1950 else
1951 {
1952 /* It's not one of our sections, so don't allocate space. */
1953 continue;
1954 }
1955
1956 if (s->size == 0)
1957 {
1958 /* If we don't need this section, strip it from the
1959 output file. This is mostly to handle .rel.bss and
1960 .rel.plt. We must create both sections in
1961 create_dynamic_sections, because they must be created
1962 before the linker maps input sections to output
1963 sections. The linker does that before
1964 adjust_dynamic_symbol is called, and it is that
1965 function which decides whether anything needs to go
1966 into these sections. */
1967 if (strip_section)
1968 s->flags |= SEC_EXCLUDE;
1969 continue;
1970 }
1971
1972 if ((s->flags & SEC_HAS_CONTENTS) == 0)
1973 continue;
1974
1975 /* Allocate memory for the section contents. We use bfd_zalloc
1976 here in case unused entries are not reclaimed before the
1977 section's contents are written out. This should not happen,
1978 but this way if it does, we get a R_386_NONE reloc instead
1979 of garbage. */
1980 s->contents = bfd_zalloc (dynobj, s->size);
1981 if (s->contents == NULL)
1982 return FALSE;
1983 }
1984
1985 if (htab->elf.dynamic_sections_created)
1986 {
1987 /* Add some entries to the .dynamic section. We fill in the
1988 values later, in elf_i386_finish_dynamic_sections, but we
1989 must add the entries now so that we get the correct size for
1990 the .dynamic section. The DT_DEBUG entry is filled in by the
1991 dynamic linker and used by the debugger. */
1992 #define add_dynamic_entry(TAG, VAL) \
1993 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1994
1995 if (info->executable)
1996 {
1997 if (!add_dynamic_entry (DT_DEBUG, 0))
1998 return FALSE;
1999 }
2000
2001 if (htab->splt->size != 0)
2002 {
2003 if (!add_dynamic_entry (DT_PLTGOT, 0)
2004 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2005 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2006 || !add_dynamic_entry (DT_JMPREL, 0))
2007 return FALSE;
2008 }
2009
2010 if (relocs)
2011 {
2012 if (!add_dynamic_entry (DT_REL, 0)
2013 || !add_dynamic_entry (DT_RELSZ, 0)
2014 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2015 return FALSE;
2016
2017 /* If any dynamic relocs apply to a read-only section,
2018 then we need a DT_TEXTREL entry. */
2019 if ((info->flags & DF_TEXTREL) == 0)
2020 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2021 (PTR) info);
2022
2023 if ((info->flags & DF_TEXTREL) != 0)
2024 {
2025 if (!add_dynamic_entry (DT_TEXTREL, 0))
2026 return FALSE;
2027 }
2028 }
2029 }
2030 #undef add_dynamic_entry
2031
2032 return TRUE;
2033 }
2034
2035 /* Set the correct type for an x86 ELF section. We do this by the
2036 section name, which is a hack, but ought to work. */
2037
2038 static bfd_boolean
2039 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2040 Elf_Internal_Shdr *hdr,
2041 asection *sec)
2042 {
2043 register const char *name;
2044
2045 name = bfd_get_section_name (abfd, sec);
2046
2047 /* This is an ugly, but unfortunately necessary hack that is
2048 needed when producing EFI binaries on x86. It tells
2049 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2050 containing ELF relocation info. We need this hack in order to
2051 be able to generate ELF binaries that can be translated into
2052 EFI applications (which are essentially COFF objects). Those
2053 files contain a COFF ".reloc" section inside an ELFNN object,
2054 which would normally cause BFD to segfault because it would
2055 attempt to interpret this section as containing relocation
2056 entries for section "oc". With this hack enabled, ".reloc"
2057 will be treated as a normal data section, which will avoid the
2058 segfault. However, you won't be able to create an ELFNN binary
2059 with a section named "oc" that needs relocations, but that's
2060 the kind of ugly side-effects you get when detecting section
2061 types based on their names... In practice, this limitation is
2062 unlikely to bite. */
2063 if (strcmp (name, ".reloc") == 0)
2064 hdr->sh_type = SHT_PROGBITS;
2065
2066 return TRUE;
2067 }
2068
2069 /* Return the base VMA address which should be subtracted from real addresses
2070 when resolving @dtpoff relocation.
2071 This is PT_TLS segment p_vaddr. */
2072
2073 static bfd_vma
2074 dtpoff_base (struct bfd_link_info *info)
2075 {
2076 /* If tls_sec is NULL, we should have signalled an error already. */
2077 if (elf_hash_table (info)->tls_sec == NULL)
2078 return 0;
2079 return elf_hash_table (info)->tls_sec->vma;
2080 }
2081
2082 /* Return the relocation value for @tpoff relocation
2083 if STT_TLS virtual address is ADDRESS. */
2084
2085 static bfd_vma
2086 tpoff (struct bfd_link_info *info, bfd_vma address)
2087 {
2088 struct elf_link_hash_table *htab = elf_hash_table (info);
2089
2090 /* If tls_sec is NULL, we should have signalled an error already. */
2091 if (htab->tls_sec == NULL)
2092 return 0;
2093 return htab->tls_size + htab->tls_sec->vma - address;
2094 }
2095
2096 /* Relocate an i386 ELF section. */
2097
2098 static bfd_boolean
2099 elf_i386_relocate_section (bfd *output_bfd,
2100 struct bfd_link_info *info,
2101 bfd *input_bfd,
2102 asection *input_section,
2103 bfd_byte *contents,
2104 Elf_Internal_Rela *relocs,
2105 Elf_Internal_Sym *local_syms,
2106 asection **local_sections)
2107 {
2108 struct elf_i386_link_hash_table *htab;
2109 Elf_Internal_Shdr *symtab_hdr;
2110 struct elf_link_hash_entry **sym_hashes;
2111 bfd_vma *local_got_offsets;
2112 Elf_Internal_Rela *rel;
2113 Elf_Internal_Rela *relend;
2114
2115 htab = elf_i386_hash_table (info);
2116 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2117 sym_hashes = elf_sym_hashes (input_bfd);
2118 local_got_offsets = elf_local_got_offsets (input_bfd);
2119
2120 rel = relocs;
2121 relend = relocs + input_section->reloc_count;
2122 for (; rel < relend; rel++)
2123 {
2124 unsigned int r_type;
2125 reloc_howto_type *howto;
2126 unsigned long r_symndx;
2127 struct elf_link_hash_entry *h;
2128 Elf_Internal_Sym *sym;
2129 asection *sec;
2130 bfd_vma off;
2131 bfd_vma relocation;
2132 bfd_boolean unresolved_reloc;
2133 bfd_reloc_status_type r;
2134 unsigned int indx;
2135 int tls_type;
2136
2137 r_type = ELF32_R_TYPE (rel->r_info);
2138 if (r_type == R_386_GNU_VTINHERIT
2139 || r_type == R_386_GNU_VTENTRY)
2140 continue;
2141
2142 if ((indx = r_type) >= R_386_standard
2143 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2144 >= R_386_ext - R_386_standard)
2145 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2146 >= R_386_tls - R_386_ext))
2147 {
2148 (*_bfd_error_handler)
2149 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2150 input_bfd, input_section, r_type);
2151 bfd_set_error (bfd_error_bad_value);
2152 return FALSE;
2153 }
2154 howto = elf_howto_table + indx;
2155
2156 r_symndx = ELF32_R_SYM (rel->r_info);
2157
2158 if (info->relocatable)
2159 {
2160 bfd_vma val;
2161 bfd_byte *where;
2162
2163 /* This is a relocatable link. We don't have to change
2164 anything, unless the reloc is against a section symbol,
2165 in which case we have to adjust according to where the
2166 section symbol winds up in the output section. */
2167 if (r_symndx >= symtab_hdr->sh_info)
2168 continue;
2169
2170 sym = local_syms + r_symndx;
2171 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2172 continue;
2173
2174 sec = local_sections[r_symndx];
2175 val = sec->output_offset;
2176 if (val == 0)
2177 continue;
2178
2179 where = contents + rel->r_offset;
2180 switch (howto->size)
2181 {
2182 /* FIXME: overflow checks. */
2183 case 0:
2184 val += bfd_get_8 (input_bfd, where);
2185 bfd_put_8 (input_bfd, val, where);
2186 break;
2187 case 1:
2188 val += bfd_get_16 (input_bfd, where);
2189 bfd_put_16 (input_bfd, val, where);
2190 break;
2191 case 2:
2192 val += bfd_get_32 (input_bfd, where);
2193 bfd_put_32 (input_bfd, val, where);
2194 break;
2195 default:
2196 abort ();
2197 }
2198 continue;
2199 }
2200
2201 /* This is a final link. */
2202 h = NULL;
2203 sym = NULL;
2204 sec = NULL;
2205 unresolved_reloc = FALSE;
2206 if (r_symndx < symtab_hdr->sh_info)
2207 {
2208 sym = local_syms + r_symndx;
2209 sec = local_sections[r_symndx];
2210 relocation = (sec->output_section->vma
2211 + sec->output_offset
2212 + sym->st_value);
2213 if ((sec->flags & SEC_MERGE)
2214 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2215 {
2216 asection *msec;
2217 bfd_vma addend;
2218 bfd_byte *where = contents + rel->r_offset;
2219
2220 switch (howto->size)
2221 {
2222 case 0:
2223 addend = bfd_get_8 (input_bfd, where);
2224 if (howto->pc_relative)
2225 {
2226 addend = (addend ^ 0x80) - 0x80;
2227 addend += 1;
2228 }
2229 break;
2230 case 1:
2231 addend = bfd_get_16 (input_bfd, where);
2232 if (howto->pc_relative)
2233 {
2234 addend = (addend ^ 0x8000) - 0x8000;
2235 addend += 2;
2236 }
2237 break;
2238 case 2:
2239 addend = bfd_get_32 (input_bfd, where);
2240 if (howto->pc_relative)
2241 {
2242 addend = (addend ^ 0x80000000) - 0x80000000;
2243 addend += 4;
2244 }
2245 break;
2246 default:
2247 abort ();
2248 }
2249
2250 msec = sec;
2251 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2252 addend -= relocation;
2253 addend += msec->output_section->vma + msec->output_offset;
2254
2255 switch (howto->size)
2256 {
2257 case 0:
2258 /* FIXME: overflow checks. */
2259 if (howto->pc_relative)
2260 addend -= 1;
2261 bfd_put_8 (input_bfd, addend, where);
2262 break;
2263 case 1:
2264 if (howto->pc_relative)
2265 addend -= 2;
2266 bfd_put_16 (input_bfd, addend, where);
2267 break;
2268 case 2:
2269 if (howto->pc_relative)
2270 addend -= 4;
2271 bfd_put_32 (input_bfd, addend, where);
2272 break;
2273 }
2274 }
2275 }
2276 else
2277 {
2278 bfd_boolean warned;
2279
2280 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2281 r_symndx, symtab_hdr, sym_hashes,
2282 h, sec, relocation,
2283 unresolved_reloc, warned);
2284 }
2285
2286 if (r_symndx == 0)
2287 {
2288 /* r_symndx will be zero only for relocs against symbols from
2289 removed linkonce sections, or sections discarded by a linker
2290 script. For these relocs, we just want the section contents
2291 zeroed. Avoid any special processing in the switch below. */
2292 r_type = R_386_NONE;
2293
2294 relocation = 0;
2295 if (howto->pc_relative)
2296 relocation = (input_section->output_section->vma
2297 + input_section->output_offset
2298 + rel->r_offset);
2299 }
2300
2301 switch (r_type)
2302 {
2303 case R_386_GOT32:
2304 /* Relocation is to the entry for this symbol in the global
2305 offset table. */
2306 if (htab->sgot == NULL)
2307 abort ();
2308
2309 if (h != NULL)
2310 {
2311 bfd_boolean dyn;
2312
2313 off = h->got.offset;
2314 dyn = htab->elf.dynamic_sections_created;
2315 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2316 || (info->shared
2317 && SYMBOL_REFERENCES_LOCAL (info, h))
2318 || (ELF_ST_VISIBILITY (h->other)
2319 && h->root.type == bfd_link_hash_undefweak))
2320 {
2321 /* This is actually a static link, or it is a
2322 -Bsymbolic link and the symbol is defined
2323 locally, or the symbol was forced to be local
2324 because of a version file. We must initialize
2325 this entry in the global offset table. Since the
2326 offset must always be a multiple of 4, we use the
2327 least significant bit to record whether we have
2328 initialized it already.
2329
2330 When doing a dynamic link, we create a .rel.got
2331 relocation entry to initialize the value. This
2332 is done in the finish_dynamic_symbol routine. */
2333 if ((off & 1) != 0)
2334 off &= ~1;
2335 else
2336 {
2337 bfd_put_32 (output_bfd, relocation,
2338 htab->sgot->contents + off);
2339 h->got.offset |= 1;
2340 }
2341 }
2342 else
2343 unresolved_reloc = FALSE;
2344 }
2345 else
2346 {
2347 if (local_got_offsets == NULL)
2348 abort ();
2349
2350 off = local_got_offsets[r_symndx];
2351
2352 /* The offset must always be a multiple of 4. We use
2353 the least significant bit to record whether we have
2354 already generated the necessary reloc. */
2355 if ((off & 1) != 0)
2356 off &= ~1;
2357 else
2358 {
2359 bfd_put_32 (output_bfd, relocation,
2360 htab->sgot->contents + off);
2361
2362 if (info->shared)
2363 {
2364 asection *s;
2365 Elf_Internal_Rela outrel;
2366 bfd_byte *loc;
2367
2368 s = htab->srelgot;
2369 if (s == NULL)
2370 abort ();
2371
2372 outrel.r_offset = (htab->sgot->output_section->vma
2373 + htab->sgot->output_offset
2374 + off);
2375 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2376 loc = s->contents;
2377 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2378 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2379 }
2380
2381 local_got_offsets[r_symndx] |= 1;
2382 }
2383 }
2384
2385 if (off >= (bfd_vma) -2)
2386 abort ();
2387
2388 relocation = htab->sgot->output_section->vma
2389 + htab->sgot->output_offset + off
2390 - htab->sgotplt->output_section->vma
2391 - htab->sgotplt->output_offset;
2392 break;
2393
2394 case R_386_GOTOFF:
2395 /* Relocation is relative to the start of the global offset
2396 table. */
2397
2398 /* Check to make sure it isn't a protected function symbol
2399 for shared library since it may not be local when used
2400 as function address. */
2401 if (info->shared
2402 && !info->executable
2403 && h
2404 && h->def_regular
2405 && h->type == STT_FUNC
2406 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2407 {
2408 (*_bfd_error_handler)
2409 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2410 input_bfd, h->root.root.string);
2411 bfd_set_error (bfd_error_bad_value);
2412 return FALSE;
2413 }
2414
2415 /* Note that sgot is not involved in this
2416 calculation. We always want the start of .got.plt. If we
2417 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2418 permitted by the ABI, we might have to change this
2419 calculation. */
2420 relocation -= htab->sgotplt->output_section->vma
2421 + htab->sgotplt->output_offset;
2422 break;
2423
2424 case R_386_GOTPC:
2425 /* Use global offset table as symbol value. */
2426 relocation = htab->sgotplt->output_section->vma
2427 + htab->sgotplt->output_offset;
2428 unresolved_reloc = FALSE;
2429 break;
2430
2431 case R_386_PLT32:
2432 /* Relocation is to the entry for this symbol in the
2433 procedure linkage table. */
2434
2435 /* Resolve a PLT32 reloc against a local symbol directly,
2436 without using the procedure linkage table. */
2437 if (h == NULL)
2438 break;
2439
2440 if (h->plt.offset == (bfd_vma) -1
2441 || htab->splt == NULL)
2442 {
2443 /* We didn't make a PLT entry for this symbol. This
2444 happens when statically linking PIC code, or when
2445 using -Bsymbolic. */
2446 break;
2447 }
2448
2449 relocation = (htab->splt->output_section->vma
2450 + htab->splt->output_offset
2451 + h->plt.offset);
2452 unresolved_reloc = FALSE;
2453 break;
2454
2455 case R_386_32:
2456 case R_386_PC32:
2457 if ((input_section->flags & SEC_ALLOC) == 0)
2458 break;
2459
2460 if ((info->shared
2461 && (h == NULL
2462 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2463 || h->root.type != bfd_link_hash_undefweak)
2464 && (r_type != R_386_PC32
2465 || !SYMBOL_CALLS_LOCAL (info, h)))
2466 || (ELIMINATE_COPY_RELOCS
2467 && !info->shared
2468 && h != NULL
2469 && h->dynindx != -1
2470 && !h->non_got_ref
2471 && ((h->def_dynamic
2472 && !h->def_regular)
2473 || h->root.type == bfd_link_hash_undefweak
2474 || h->root.type == bfd_link_hash_undefined)))
2475 {
2476 Elf_Internal_Rela outrel;
2477 bfd_byte *loc;
2478 bfd_boolean skip, relocate;
2479 asection *sreloc;
2480
2481 /* When generating a shared object, these relocations
2482 are copied into the output file to be resolved at run
2483 time. */
2484
2485 skip = FALSE;
2486 relocate = FALSE;
2487
2488 outrel.r_offset =
2489 _bfd_elf_section_offset (output_bfd, info, input_section,
2490 rel->r_offset);
2491 if (outrel.r_offset == (bfd_vma) -1)
2492 skip = TRUE;
2493 else if (outrel.r_offset == (bfd_vma) -2)
2494 skip = TRUE, relocate = TRUE;
2495 outrel.r_offset += (input_section->output_section->vma
2496 + input_section->output_offset);
2497
2498 if (skip)
2499 memset (&outrel, 0, sizeof outrel);
2500 else if (h != NULL
2501 && h->dynindx != -1
2502 && (r_type == R_386_PC32
2503 || !info->shared
2504 || !info->symbolic
2505 || !h->def_regular))
2506 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2507 else
2508 {
2509 /* This symbol is local, or marked to become local. */
2510 relocate = TRUE;
2511 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2512 }
2513
2514 sreloc = elf_section_data (input_section)->sreloc;
2515 if (sreloc == NULL)
2516 abort ();
2517
2518 loc = sreloc->contents;
2519 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2520 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2521
2522 /* If this reloc is against an external symbol, we do
2523 not want to fiddle with the addend. Otherwise, we
2524 need to include the symbol value so that it becomes
2525 an addend for the dynamic reloc. */
2526 if (! relocate)
2527 continue;
2528 }
2529 break;
2530
2531 case R_386_TLS_IE:
2532 if (info->shared)
2533 {
2534 Elf_Internal_Rela outrel;
2535 bfd_byte *loc;
2536 asection *sreloc;
2537
2538 outrel.r_offset = rel->r_offset
2539 + input_section->output_section->vma
2540 + input_section->output_offset;
2541 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2542 sreloc = elf_section_data (input_section)->sreloc;
2543 if (sreloc == NULL)
2544 abort ();
2545 loc = sreloc->contents;
2546 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2547 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2548 }
2549 /* Fall through */
2550
2551 case R_386_TLS_GD:
2552 case R_386_TLS_IE_32:
2553 case R_386_TLS_GOTIE:
2554 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2555 tls_type = GOT_UNKNOWN;
2556 if (h == NULL && local_got_offsets)
2557 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2558 else if (h != NULL)
2559 {
2560 tls_type = elf_i386_hash_entry(h)->tls_type;
2561 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2562 r_type = R_386_TLS_LE_32;
2563 }
2564 if (tls_type == GOT_TLS_IE)
2565 tls_type = GOT_TLS_IE_NEG;
2566 if (r_type == R_386_TLS_GD)
2567 {
2568 if (tls_type == GOT_TLS_IE_POS)
2569 r_type = R_386_TLS_GOTIE;
2570 else if (tls_type & GOT_TLS_IE)
2571 r_type = R_386_TLS_IE_32;
2572 }
2573
2574 if (r_type == R_386_TLS_LE_32)
2575 {
2576 BFD_ASSERT (! unresolved_reloc);
2577 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2578 {
2579 unsigned int val, type;
2580 bfd_vma roff;
2581
2582 /* GD->LE transition. */
2583 BFD_ASSERT (rel->r_offset >= 2);
2584 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2585 BFD_ASSERT (type == 0x8d || type == 0x04);
2586 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2587 BFD_ASSERT (bfd_get_8 (input_bfd,
2588 contents + rel->r_offset + 4)
2589 == 0xe8);
2590 BFD_ASSERT (rel + 1 < relend);
2591 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2592 roff = rel->r_offset + 5;
2593 val = bfd_get_8 (input_bfd,
2594 contents + rel->r_offset - 1);
2595 if (type == 0x04)
2596 {
2597 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2598 Change it into:
2599 movl %gs:0, %eax; subl $foo@tpoff, %eax
2600 (6 byte form of subl). */
2601 BFD_ASSERT (rel->r_offset >= 3);
2602 BFD_ASSERT (bfd_get_8 (input_bfd,
2603 contents + rel->r_offset - 3)
2604 == 0x8d);
2605 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2606 memcpy (contents + rel->r_offset - 3,
2607 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2608 }
2609 else
2610 {
2611 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2612 if (rel->r_offset + 10 <= input_section->size
2613 && bfd_get_8 (input_bfd,
2614 contents + rel->r_offset + 9) == 0x90)
2615 {
2616 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2617 Change it into:
2618 movl %gs:0, %eax; subl $foo@tpoff, %eax
2619 (6 byte form of subl). */
2620 memcpy (contents + rel->r_offset - 2,
2621 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2622 roff = rel->r_offset + 6;
2623 }
2624 else
2625 {
2626 /* leal foo(%reg), %eax; call ___tls_get_addr
2627 Change it into:
2628 movl %gs:0, %eax; subl $foo@tpoff, %eax
2629 (5 byte form of subl). */
2630 memcpy (contents + rel->r_offset - 2,
2631 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2632 }
2633 }
2634 bfd_put_32 (output_bfd, tpoff (info, relocation),
2635 contents + roff);
2636 /* Skip R_386_PLT32. */
2637 rel++;
2638 continue;
2639 }
2640 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2641 {
2642 unsigned int val, type;
2643
2644 /* IE->LE transition:
2645 Originally it can be one of:
2646 movl foo, %eax
2647 movl foo, %reg
2648 addl foo, %reg
2649 We change it into:
2650 movl $foo, %eax
2651 movl $foo, %reg
2652 addl $foo, %reg. */
2653 BFD_ASSERT (rel->r_offset >= 1);
2654 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2655 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2656 if (val == 0xa1)
2657 {
2658 /* movl foo, %eax. */
2659 bfd_put_8 (output_bfd, 0xb8,
2660 contents + rel->r_offset - 1);
2661 }
2662 else
2663 {
2664 BFD_ASSERT (rel->r_offset >= 2);
2665 type = bfd_get_8 (input_bfd,
2666 contents + rel->r_offset - 2);
2667 switch (type)
2668 {
2669 case 0x8b:
2670 /* movl */
2671 BFD_ASSERT ((val & 0xc7) == 0x05);
2672 bfd_put_8 (output_bfd, 0xc7,
2673 contents + rel->r_offset - 2);
2674 bfd_put_8 (output_bfd,
2675 0xc0 | ((val >> 3) & 7),
2676 contents + rel->r_offset - 1);
2677 break;
2678 case 0x03:
2679 /* addl */
2680 BFD_ASSERT ((val & 0xc7) == 0x05);
2681 bfd_put_8 (output_bfd, 0x81,
2682 contents + rel->r_offset - 2);
2683 bfd_put_8 (output_bfd,
2684 0xc0 | ((val >> 3) & 7),
2685 contents + rel->r_offset - 1);
2686 break;
2687 default:
2688 BFD_FAIL ();
2689 break;
2690 }
2691 }
2692 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2693 contents + rel->r_offset);
2694 continue;
2695 }
2696 else
2697 {
2698 unsigned int val, type;
2699
2700 /* {IE_32,GOTIE}->LE transition:
2701 Originally it can be one of:
2702 subl foo(%reg1), %reg2
2703 movl foo(%reg1), %reg2
2704 addl foo(%reg1), %reg2
2705 We change it into:
2706 subl $foo, %reg2
2707 movl $foo, %reg2 (6 byte form)
2708 addl $foo, %reg2. */
2709 BFD_ASSERT (rel->r_offset >= 2);
2710 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2711 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2712 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2713 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2714 if (type == 0x8b)
2715 {
2716 /* movl */
2717 bfd_put_8 (output_bfd, 0xc7,
2718 contents + rel->r_offset - 2);
2719 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2720 contents + rel->r_offset - 1);
2721 }
2722 else if (type == 0x2b)
2723 {
2724 /* subl */
2725 bfd_put_8 (output_bfd, 0x81,
2726 contents + rel->r_offset - 2);
2727 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2728 contents + rel->r_offset - 1);
2729 }
2730 else if (type == 0x03)
2731 {
2732 /* addl */
2733 bfd_put_8 (output_bfd, 0x81,
2734 contents + rel->r_offset - 2);
2735 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2736 contents + rel->r_offset - 1);
2737 }
2738 else
2739 BFD_FAIL ();
2740 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2741 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2742 contents + rel->r_offset);
2743 else
2744 bfd_put_32 (output_bfd, tpoff (info, relocation),
2745 contents + rel->r_offset);
2746 continue;
2747 }
2748 }
2749
2750 if (htab->sgot == NULL)
2751 abort ();
2752
2753 if (h != NULL)
2754 off = h->got.offset;
2755 else
2756 {
2757 if (local_got_offsets == NULL)
2758 abort ();
2759
2760 off = local_got_offsets[r_symndx];
2761 }
2762
2763 if ((off & 1) != 0)
2764 off &= ~1;
2765 else
2766 {
2767 Elf_Internal_Rela outrel;
2768 bfd_byte *loc;
2769 int dr_type, indx;
2770
2771 if (htab->srelgot == NULL)
2772 abort ();
2773
2774 outrel.r_offset = (htab->sgot->output_section->vma
2775 + htab->sgot->output_offset + off);
2776
2777 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2778 if (r_type == R_386_TLS_GD)
2779 dr_type = R_386_TLS_DTPMOD32;
2780 else if (tls_type == GOT_TLS_IE_POS)
2781 dr_type = R_386_TLS_TPOFF;
2782 else
2783 dr_type = R_386_TLS_TPOFF32;
2784 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2785 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2786 htab->sgot->contents + off);
2787 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2788 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2789 htab->sgot->contents + off);
2790 else
2791 bfd_put_32 (output_bfd, 0,
2792 htab->sgot->contents + off);
2793 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2794 loc = htab->srelgot->contents;
2795 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2796 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2797
2798 if (r_type == R_386_TLS_GD)
2799 {
2800 if (indx == 0)
2801 {
2802 BFD_ASSERT (! unresolved_reloc);
2803 bfd_put_32 (output_bfd,
2804 relocation - dtpoff_base (info),
2805 htab->sgot->contents + off + 4);
2806 }
2807 else
2808 {
2809 bfd_put_32 (output_bfd, 0,
2810 htab->sgot->contents + off + 4);
2811 outrel.r_info = ELF32_R_INFO (indx,
2812 R_386_TLS_DTPOFF32);
2813 outrel.r_offset += 4;
2814 htab->srelgot->reloc_count++;
2815 loc += sizeof (Elf32_External_Rel);
2816 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2817 }
2818 }
2819 else if (tls_type == GOT_TLS_IE_BOTH)
2820 {
2821 bfd_put_32 (output_bfd,
2822 indx == 0 ? relocation - dtpoff_base (info) : 0,
2823 htab->sgot->contents + off + 4);
2824 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2825 outrel.r_offset += 4;
2826 htab->srelgot->reloc_count++;
2827 loc += sizeof (Elf32_External_Rel);
2828 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2829 }
2830
2831 if (h != NULL)
2832 h->got.offset |= 1;
2833 else
2834 local_got_offsets[r_symndx] |= 1;
2835 }
2836
2837 if (off >= (bfd_vma) -2)
2838 abort ();
2839 if (r_type == ELF32_R_TYPE (rel->r_info))
2840 {
2841 bfd_vma g_o_t = htab->sgotplt->output_section->vma
2842 + htab->sgotplt->output_offset;
2843 relocation = htab->sgot->output_section->vma
2844 + htab->sgot->output_offset + off - g_o_t;
2845 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2846 && tls_type == GOT_TLS_IE_BOTH)
2847 relocation += 4;
2848 if (r_type == R_386_TLS_IE)
2849 relocation += g_o_t;
2850 unresolved_reloc = FALSE;
2851 }
2852 else
2853 {
2854 unsigned int val, type;
2855 bfd_vma roff;
2856
2857 /* GD->IE transition. */
2858 BFD_ASSERT (rel->r_offset >= 2);
2859 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2860 BFD_ASSERT (type == 0x8d || type == 0x04);
2861 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2862 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2863 == 0xe8);
2864 BFD_ASSERT (rel + 1 < relend);
2865 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2866 roff = rel->r_offset - 3;
2867 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2868 if (type == 0x04)
2869 {
2870 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2871 Change it into:
2872 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2873 BFD_ASSERT (rel->r_offset >= 3);
2874 BFD_ASSERT (bfd_get_8 (input_bfd,
2875 contents + rel->r_offset - 3)
2876 == 0x8d);
2877 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2878 val >>= 3;
2879 }
2880 else
2881 {
2882 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2883 Change it into:
2884 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2885 BFD_ASSERT (rel->r_offset + 10 <= input_section->size);
2886 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2887 BFD_ASSERT (bfd_get_8 (input_bfd,
2888 contents + rel->r_offset + 9)
2889 == 0x90);
2890 roff = rel->r_offset - 2;
2891 }
2892 memcpy (contents + roff,
2893 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2894 contents[roff + 7] = 0x80 | (val & 7);
2895 /* If foo is used only with foo@gotntpoff(%reg) and
2896 foo@indntpoff, but not with foo@gottpoff(%reg), change
2897 subl $foo@gottpoff(%reg), %eax
2898 into:
2899 addl $foo@gotntpoff(%reg), %eax. */
2900 if (r_type == R_386_TLS_GOTIE)
2901 {
2902 contents[roff + 6] = 0x03;
2903 if (tls_type == GOT_TLS_IE_BOTH)
2904 off += 4;
2905 }
2906 bfd_put_32 (output_bfd,
2907 htab->sgot->output_section->vma
2908 + htab->sgot->output_offset + off
2909 - htab->sgotplt->output_section->vma
2910 - htab->sgotplt->output_offset,
2911 contents + roff + 8);
2912 /* Skip R_386_PLT32. */
2913 rel++;
2914 continue;
2915 }
2916 break;
2917
2918 case R_386_TLS_LDM:
2919 if (! info->shared)
2920 {
2921 unsigned int val;
2922
2923 /* LD->LE transition:
2924 Ensure it is:
2925 leal foo(%reg), %eax; call ___tls_get_addr.
2926 We change it into:
2927 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2928 BFD_ASSERT (rel->r_offset >= 2);
2929 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2930 == 0x8d);
2931 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2932 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2933 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2934 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2935 == 0xe8);
2936 BFD_ASSERT (rel + 1 < relend);
2937 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2938 memcpy (contents + rel->r_offset - 2,
2939 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2940 /* Skip R_386_PLT32. */
2941 rel++;
2942 continue;
2943 }
2944
2945 if (htab->sgot == NULL)
2946 abort ();
2947
2948 off = htab->tls_ldm_got.offset;
2949 if (off & 1)
2950 off &= ~1;
2951 else
2952 {
2953 Elf_Internal_Rela outrel;
2954 bfd_byte *loc;
2955
2956 if (htab->srelgot == NULL)
2957 abort ();
2958
2959 outrel.r_offset = (htab->sgot->output_section->vma
2960 + htab->sgot->output_offset + off);
2961
2962 bfd_put_32 (output_bfd, 0,
2963 htab->sgot->contents + off);
2964 bfd_put_32 (output_bfd, 0,
2965 htab->sgot->contents + off + 4);
2966 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2967 loc = htab->srelgot->contents;
2968 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2969 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2970 htab->tls_ldm_got.offset |= 1;
2971 }
2972 relocation = htab->sgot->output_section->vma
2973 + htab->sgot->output_offset + off
2974 - htab->sgotplt->output_section->vma
2975 - htab->sgotplt->output_offset;
2976 unresolved_reloc = FALSE;
2977 break;
2978
2979 case R_386_TLS_LDO_32:
2980 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2981 relocation -= dtpoff_base (info);
2982 else
2983 /* When converting LDO to LE, we must negate. */
2984 relocation = -tpoff (info, relocation);
2985 break;
2986
2987 case R_386_TLS_LE_32:
2988 case R_386_TLS_LE:
2989 if (info->shared)
2990 {
2991 Elf_Internal_Rela outrel;
2992 asection *sreloc;
2993 bfd_byte *loc;
2994 int indx;
2995
2996 outrel.r_offset = rel->r_offset
2997 + input_section->output_section->vma
2998 + input_section->output_offset;
2999 if (h != NULL && h->dynindx != -1)
3000 indx = h->dynindx;
3001 else
3002 indx = 0;
3003 if (r_type == R_386_TLS_LE_32)
3004 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3005 else
3006 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3007 sreloc = elf_section_data (input_section)->sreloc;
3008 if (sreloc == NULL)
3009 abort ();
3010 loc = sreloc->contents;
3011 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3012 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3013 if (indx)
3014 continue;
3015 else if (r_type == R_386_TLS_LE_32)
3016 relocation = dtpoff_base (info) - relocation;
3017 else
3018 relocation -= dtpoff_base (info);
3019 }
3020 else if (r_type == R_386_TLS_LE_32)
3021 relocation = tpoff (info, relocation);
3022 else
3023 relocation = -tpoff (info, relocation);
3024 break;
3025
3026 default:
3027 break;
3028 }
3029
3030 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3031 because such sections are not SEC_ALLOC and thus ld.so will
3032 not process them. */
3033 if (unresolved_reloc
3034 && !((input_section->flags & SEC_DEBUGGING) != 0
3035 && h->def_dynamic))
3036 {
3037 (*_bfd_error_handler)
3038 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3039 input_bfd,
3040 input_section,
3041 (long) rel->r_offset,
3042 howto->name,
3043 h->root.root.string);
3044 return FALSE;
3045 }
3046
3047 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3048 contents, rel->r_offset,
3049 relocation, 0);
3050
3051 if (r != bfd_reloc_ok)
3052 {
3053 const char *name;
3054
3055 if (h != NULL)
3056 name = h->root.root.string;
3057 else
3058 {
3059 name = bfd_elf_string_from_elf_section (input_bfd,
3060 symtab_hdr->sh_link,
3061 sym->st_name);
3062 if (name == NULL)
3063 return FALSE;
3064 if (*name == '\0')
3065 name = bfd_section_name (input_bfd, sec);
3066 }
3067
3068 if (r == bfd_reloc_overflow)
3069 {
3070 if (! ((*info->callbacks->reloc_overflow)
3071 (info, (h ? &h->root : NULL), name, howto->name,
3072 (bfd_vma) 0, input_bfd, input_section,
3073 rel->r_offset)))
3074 return FALSE;
3075 }
3076 else
3077 {
3078 (*_bfd_error_handler)
3079 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3080 input_bfd, input_section,
3081 (long) rel->r_offset, name, (int) r);
3082 return FALSE;
3083 }
3084 }
3085 }
3086
3087 return TRUE;
3088 }
3089
3090 /* Finish up dynamic symbol handling. We set the contents of various
3091 dynamic sections here. */
3092
3093 static bfd_boolean
3094 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3095 struct bfd_link_info *info,
3096 struct elf_link_hash_entry *h,
3097 Elf_Internal_Sym *sym)
3098 {
3099 struct elf_i386_link_hash_table *htab;
3100
3101 htab = elf_i386_hash_table (info);
3102
3103 if (h->plt.offset != (bfd_vma) -1)
3104 {
3105 bfd_vma plt_index;
3106 bfd_vma got_offset;
3107 Elf_Internal_Rela rel;
3108 bfd_byte *loc;
3109
3110 /* This symbol has an entry in the procedure linkage table. Set
3111 it up. */
3112
3113 if (h->dynindx == -1
3114 || htab->splt == NULL
3115 || htab->sgotplt == NULL
3116 || htab->srelplt == NULL)
3117 abort ();
3118
3119 /* Get the index in the procedure linkage table which
3120 corresponds to this symbol. This is the index of this symbol
3121 in all the symbols for which we are making plt entries. The
3122 first entry in the procedure linkage table is reserved. */
3123 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3124
3125 /* Get the offset into the .got table of the entry that
3126 corresponds to this function. Each .got entry is 4 bytes.
3127 The first three are reserved. */
3128 got_offset = (plt_index + 3) * 4;
3129
3130 /* Fill in the entry in the procedure linkage table. */
3131 if (! info->shared)
3132 {
3133 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3134 PLT_ENTRY_SIZE);
3135 bfd_put_32 (output_bfd,
3136 (htab->sgotplt->output_section->vma
3137 + htab->sgotplt->output_offset
3138 + got_offset),
3139 htab->splt->contents + h->plt.offset + 2);
3140
3141 if (htab->is_vxworks)
3142 {
3143 int s, k, reloc_index;
3144
3145 /* Create the R_386_32 relocation referencing the GOT
3146 for this PLT entry. */
3147
3148 /* S: Current slot number (zero-based). */
3149 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3150 /* K: Number of relocations for PLTResolve. */
3151 if (info->shared)
3152 k = PLTRESOLVE_RELOCS_SHLIB;
3153 else
3154 k = PLTRESOLVE_RELOCS;
3155 /* Skip the PLTresolve relocations, and the relocations for
3156 the other PLT slots. */
3157 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3158 loc = (htab->srelplt2->contents + reloc_index
3159 * sizeof (Elf32_External_Rel));
3160
3161 rel.r_offset = (htab->splt->output_section->vma
3162 + htab->splt->output_offset
3163 + h->plt.offset + 2),
3164 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3165 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3166
3167 /* Create the R_386_32 relocation referencing the beginning of
3168 the PLT for this GOT entry. */
3169 rel.r_offset = (htab->sgotplt->output_section->vma
3170 + htab->sgotplt->output_offset
3171 + got_offset);
3172 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3173 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3174 loc + sizeof (Elf32_External_Rel));
3175 }
3176 }
3177 else
3178 {
3179 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3180 PLT_ENTRY_SIZE);
3181 bfd_put_32 (output_bfd, got_offset,
3182 htab->splt->contents + h->plt.offset + 2);
3183 }
3184
3185 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3186 htab->splt->contents + h->plt.offset + 7);
3187 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3188 htab->splt->contents + h->plt.offset + 12);
3189
3190 /* Fill in the entry in the global offset table. */
3191 bfd_put_32 (output_bfd,
3192 (htab->splt->output_section->vma
3193 + htab->splt->output_offset
3194 + h->plt.offset
3195 + 6),
3196 htab->sgotplt->contents + got_offset);
3197
3198 /* Fill in the entry in the .rel.plt section. */
3199 rel.r_offset = (htab->sgotplt->output_section->vma
3200 + htab->sgotplt->output_offset
3201 + got_offset);
3202 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3203 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3204 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3205
3206 if (!h->def_regular)
3207 {
3208 /* Mark the symbol as undefined, rather than as defined in
3209 the .plt section. Leave the value if there were any
3210 relocations where pointer equality matters (this is a clue
3211 for the dynamic linker, to make function pointer
3212 comparisons work between an application and shared
3213 library), otherwise set it to zero. If a function is only
3214 called from a binary, there is no need to slow down
3215 shared libraries because of that. */
3216 sym->st_shndx = SHN_UNDEF;
3217 if (!h->pointer_equality_needed)
3218 sym->st_value = 0;
3219 }
3220 }
3221
3222 if (h->got.offset != (bfd_vma) -1
3223 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3224 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3225 {
3226 Elf_Internal_Rela rel;
3227 bfd_byte *loc;
3228
3229 /* This symbol has an entry in the global offset table. Set it
3230 up. */
3231
3232 if (htab->sgot == NULL || htab->srelgot == NULL)
3233 abort ();
3234
3235 rel.r_offset = (htab->sgot->output_section->vma
3236 + htab->sgot->output_offset
3237 + (h->got.offset & ~(bfd_vma) 1));
3238
3239 /* If this is a static link, or it is a -Bsymbolic link and the
3240 symbol is defined locally or was forced to be local because
3241 of a version file, we just want to emit a RELATIVE reloc.
3242 The entry in the global offset table will already have been
3243 initialized in the relocate_section function. */
3244 if (info->shared
3245 && SYMBOL_REFERENCES_LOCAL (info, h))
3246 {
3247 BFD_ASSERT((h->got.offset & 1) != 0);
3248 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3249 }
3250 else
3251 {
3252 BFD_ASSERT((h->got.offset & 1) == 0);
3253 bfd_put_32 (output_bfd, (bfd_vma) 0,
3254 htab->sgot->contents + h->got.offset);
3255 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3256 }
3257
3258 loc = htab->srelgot->contents;
3259 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3260 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3261 }
3262
3263 if (h->needs_copy)
3264 {
3265 Elf_Internal_Rela rel;
3266 bfd_byte *loc;
3267
3268 /* This symbol needs a copy reloc. Set it up. */
3269
3270 if (h->dynindx == -1
3271 || (h->root.type != bfd_link_hash_defined
3272 && h->root.type != bfd_link_hash_defweak)
3273 || htab->srelbss == NULL)
3274 abort ();
3275
3276 rel.r_offset = (h->root.u.def.value
3277 + h->root.u.def.section->output_section->vma
3278 + h->root.u.def.section->output_offset);
3279 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3280 loc = htab->srelbss->contents;
3281 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3282 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3283 }
3284
3285 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3286 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3287 is relative to the ".got" section. */
3288 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3289 || (strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0
3290 && !htab->is_vxworks))
3291 sym->st_shndx = SHN_ABS;
3292
3293 return TRUE;
3294 }
3295
3296 /* Used to decide how to sort relocs in an optimal manner for the
3297 dynamic linker, before writing them out. */
3298
3299 static enum elf_reloc_type_class
3300 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3301 {
3302 switch (ELF32_R_TYPE (rela->r_info))
3303 {
3304 case R_386_RELATIVE:
3305 return reloc_class_relative;
3306 case R_386_JUMP_SLOT:
3307 return reloc_class_plt;
3308 case R_386_COPY:
3309 return reloc_class_copy;
3310 default:
3311 return reloc_class_normal;
3312 }
3313 }
3314
3315 /* Finish up the dynamic sections. */
3316
3317 static bfd_boolean
3318 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3319 struct bfd_link_info *info)
3320 {
3321 struct elf_i386_link_hash_table *htab;
3322 bfd *dynobj;
3323 asection *sdyn;
3324
3325 htab = elf_i386_hash_table (info);
3326 dynobj = htab->elf.dynobj;
3327 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3328
3329 if (htab->elf.dynamic_sections_created)
3330 {
3331 Elf32_External_Dyn *dyncon, *dynconend;
3332
3333 if (sdyn == NULL || htab->sgot == NULL)
3334 abort ();
3335
3336 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3337 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3338 for (; dyncon < dynconend; dyncon++)
3339 {
3340 Elf_Internal_Dyn dyn;
3341 asection *s;
3342
3343 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3344
3345 switch (dyn.d_tag)
3346 {
3347 default:
3348 continue;
3349
3350 case DT_PLTGOT:
3351 s = htab->sgotplt;
3352 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3353 break;
3354
3355 case DT_JMPREL:
3356 s = htab->srelplt;
3357 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3358 break;
3359
3360 case DT_PLTRELSZ:
3361 s = htab->srelplt;
3362 dyn.d_un.d_val = s->size;
3363 break;
3364
3365 case DT_RELSZ:
3366 /* My reading of the SVR4 ABI indicates that the
3367 procedure linkage table relocs (DT_JMPREL) should be
3368 included in the overall relocs (DT_REL). This is
3369 what Solaris does. However, UnixWare can not handle
3370 that case. Therefore, we override the DT_RELSZ entry
3371 here to make it not include the JMPREL relocs. */
3372 s = htab->srelplt;
3373 if (s == NULL)
3374 continue;
3375 dyn.d_un.d_val -= s->size;
3376 break;
3377
3378 case DT_REL:
3379 /* We may not be using the standard ELF linker script.
3380 If .rel.plt is the first .rel section, we adjust
3381 DT_REL to not include it. */
3382 s = htab->srelplt;
3383 if (s == NULL)
3384 continue;
3385 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3386 continue;
3387 dyn.d_un.d_ptr += s->size;
3388 break;
3389 }
3390
3391 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3392 }
3393
3394 /* Fill in the first entry in the procedure linkage table. */
3395 if (htab->splt && htab->splt->size > 0)
3396 {
3397 if (info->shared)
3398 {
3399 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3400 sizeof (elf_i386_pic_plt0_entry));
3401 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3402 htab->plt0_pad_byte,
3403 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3404 }
3405 else
3406 {
3407 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3408 sizeof(elf_i386_plt0_entry));
3409 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3410 htab->plt0_pad_byte,
3411 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3412 bfd_put_32 (output_bfd,
3413 (htab->sgotplt->output_section->vma
3414 + htab->sgotplt->output_offset
3415 + 4),
3416 htab->splt->contents + 2);
3417 bfd_put_32 (output_bfd,
3418 (htab->sgotplt->output_section->vma
3419 + htab->sgotplt->output_offset
3420 + 8),
3421 htab->splt->contents + 8);
3422
3423 if (htab->is_vxworks)
3424 {
3425 Elf_Internal_Rela rel;
3426 struct elf_link_hash_entry *hgot;
3427
3428 /* The VxWorks GOT is relocated by the dynamic linker.
3429 Therefore, we must emit relocations rather than
3430 simply computing the values now. */
3431 hgot = elf_link_hash_lookup (elf_hash_table (info),
3432 "_GLOBAL_OFFSET_TABLE_",
3433 FALSE, FALSE, FALSE);
3434 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3435 On IA32 we use REL relocations so the addend goes in
3436 the PLT directly. */
3437 rel.r_offset = (htab->splt->output_section->vma
3438 + htab->splt->output_offset
3439 + 2);
3440 rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32);
3441 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3442 htab->srelplt2->contents);
3443 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3444 rel.r_offset = (htab->splt->output_section->vma
3445 + htab->splt->output_offset
3446 + 8);
3447 rel.r_info = ELF32_R_INFO (hgot->indx, R_386_32);
3448 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3449 htab->srelplt2->contents +
3450 sizeof (Elf32_External_Rel));
3451 }
3452 }
3453
3454 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3455 really seem like the right value. */
3456 elf_section_data (htab->splt->output_section)
3457 ->this_hdr.sh_entsize = 4;
3458
3459 /* Correct the .rel.plt.unloaded relocations. */
3460 if (htab->is_vxworks && !info->shared)
3461 {
3462 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3463 unsigned char *p;
3464
3465 p = htab->srelplt2->contents;
3466 if (info->shared)
3467 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3468 else
3469 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3470
3471 for (; num_plts; num_plts--)
3472 {
3473 Elf_Internal_Rela rel;
3474 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3475 rel.r_info = ELF32_R_INFO (htab->hgot->indx, R_386_32);
3476 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3477 p += sizeof (Elf32_External_Rel);
3478
3479 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3480 rel.r_info = ELF32_R_INFO (htab->hplt->indx, R_386_32);
3481 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3482 p += sizeof (Elf32_External_Rel);
3483 }
3484 }
3485 }
3486 }
3487
3488 if (htab->sgotplt)
3489 {
3490 /* Fill in the first three entries in the global offset table. */
3491 if (htab->sgotplt->size > 0)
3492 {
3493 bfd_put_32 (output_bfd,
3494 (sdyn == NULL ? 0
3495 : sdyn->output_section->vma + sdyn->output_offset),
3496 htab->sgotplt->contents);
3497 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3498 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3499 }
3500
3501 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3502 }
3503
3504 if (htab->sgot && htab->sgot->size > 0)
3505 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3506
3507 return TRUE;
3508 }
3509
3510 /* Return address for Ith PLT stub in section PLT, for relocation REL
3511 or (bfd_vma) -1 if it should not be included. */
3512
3513 static bfd_vma
3514 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3515 const arelent *rel ATTRIBUTE_UNUSED)
3516 {
3517 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3518 }
3519
3520
3521 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3522 #define TARGET_LITTLE_NAME "elf32-i386"
3523 #define ELF_ARCH bfd_arch_i386
3524 #define ELF_MACHINE_CODE EM_386
3525 #define ELF_MAXPAGESIZE 0x1000
3526
3527 #define elf_backend_can_gc_sections 1
3528 #define elf_backend_can_refcount 1
3529 #define elf_backend_want_got_plt 1
3530 #define elf_backend_plt_readonly 1
3531 #define elf_backend_want_plt_sym 0
3532 #define elf_backend_got_header_size 12
3533
3534 /* Support RELA for objdump of prelink objects. */
3535 #define elf_info_to_howto elf_i386_info_to_howto_rel
3536 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3537
3538 #define bfd_elf32_mkobject elf_i386_mkobject
3539
3540 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3541 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3542 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3543
3544 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3545 #define elf_backend_check_relocs elf_i386_check_relocs
3546 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3547 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3548 #define elf_backend_fake_sections elf_i386_fake_sections
3549 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3550 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3551 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3552 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3553 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3554 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3555 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3556 #define elf_backend_relocate_section elf_i386_relocate_section
3557 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3558 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
3559
3560 #include "elf32-target.h"
3561
3562 /* FreeBSD support. */
3563
3564 #undef TARGET_LITTLE_SYM
3565 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3566 #undef TARGET_LITTLE_NAME
3567 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3568
3569 /* The kernel recognizes executables as valid only if they carry a
3570 "FreeBSD" label in the ELF header. So we put this label on all
3571 executables and (for simplicity) also all other object files. */
3572
3573 static void
3574 elf_i386_post_process_headers (bfd *abfd,
3575 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3576 {
3577 Elf_Internal_Ehdr *i_ehdrp;
3578
3579 i_ehdrp = elf_elfheader (abfd);
3580
3581 /* Put an ABI label supported by FreeBSD >= 4.1. */
3582 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3583 #ifdef OLD_FREEBSD_ABI_LABEL
3584 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3585 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3586 #endif
3587 }
3588
3589 #undef elf_backend_post_process_headers
3590 #define elf_backend_post_process_headers elf_i386_post_process_headers
3591 #undef elf32_bed
3592 #define elf32_bed elf32_i386_fbsd_bed
3593
3594 #include "elf32-target.h"
3595
3596 /* VxWorks support. */
3597
3598 #undef TARGET_LITTLE_SYM
3599 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
3600 #undef TARGET_LITTLE_NAME
3601 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
3602
3603
3604 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
3605
3606 static struct bfd_link_hash_table *
3607 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
3608 {
3609 struct bfd_link_hash_table *ret;
3610 struct elf_i386_link_hash_table *htab;
3611
3612 ret = elf_i386_link_hash_table_create (abfd);
3613 if (ret)
3614 {
3615 htab = (struct elf_i386_link_hash_table *) ret;
3616 htab->is_vxworks = 1;
3617 htab->plt0_pad_byte = 0x90;
3618 }
3619
3620 return ret;
3621 }
3622
3623
3624 /* Tweak magic VxWorks symbols as they are written to the output file. */
3625 static bfd_boolean
3626 elf_i386_vxworks_link_output_symbol_hook (struct bfd_link_info *info
3627 ATTRIBUTE_UNUSED,
3628 const char *name,
3629 Elf_Internal_Sym *sym,
3630 asection *input_sec ATTRIBUTE_UNUSED,
3631 struct elf_link_hash_entry *h
3632 ATTRIBUTE_UNUSED)
3633 {
3634 /* Ignore the first dummy symbol. */
3635 if (!name)
3636 return TRUE;
3637
3638 return elf_vxworks_link_output_symbol_hook (name, sym);
3639 }
3640
3641 #undef elf_backend_post_process_headers
3642 #undef bfd_elf32_bfd_link_hash_table_create
3643 #define bfd_elf32_bfd_link_hash_table_create \
3644 elf_i386_vxworks_link_hash_table_create
3645 #undef elf_backend_add_symbol_hook
3646 #define elf_backend_add_symbol_hook \
3647 elf_vxworks_add_symbol_hook
3648 #undef elf_backend_link_output_symbol_hook
3649 #define elf_backend_link_output_symbol_hook \
3650 elf_i386_vxworks_link_output_symbol_hook
3651 #undef elf_backend_emit_relocs
3652 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
3653 #undef elf_backend_final_write_processing
3654 #define elf_backend_final_write_processing \
3655 elf_vxworks_final_write_processing
3656
3657 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
3658 define it. */
3659 #undef elf_backend_want_plt_sym
3660 #define elf_backend_want_plt_sym 1
3661
3662 #undef elf32_bed
3663 #define elf32_bed elf32_i386_vxworks_bed
3664
3665 #include "elf32-target.h"
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