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