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2007-08-21 H.J. Lu <hongjiu.lu@intel.com>
[binutils.git] / bfd / elf32-i386.c
blobaf3b860ab777e18110ef02d7b154c5a5661cd3b3
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, 2006, 2007 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 3 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,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-vxworks.h"
28
29 /* 386 uses REL relocations instead of RELA. */
30 #define USE_REL 1
31
32 #include "elf/i386.h"
33
34 static reloc_howto_type elf_howto_table[]=
35 {
36 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
37 bfd_elf_generic_reloc, "R_386_NONE",
38 TRUE, 0x00000000, 0x00000000, FALSE),
39 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
40 bfd_elf_generic_reloc, "R_386_32",
41 TRUE, 0xffffffff, 0xffffffff, FALSE),
42 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_PC32",
44 TRUE, 0xffffffff, 0xffffffff, TRUE),
45 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_GOT32",
47 TRUE, 0xffffffff, 0xffffffff, FALSE),
48 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_PLT32",
50 TRUE, 0xffffffff, 0xffffffff, TRUE),
51 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_COPY",
53 TRUE, 0xffffffff, 0xffffffff, FALSE),
54 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
56 TRUE, 0xffffffff, 0xffffffff, FALSE),
57 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_RELATIVE",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_GOTOFF",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_GOTPC",
68 TRUE, 0xffffffff, 0xffffffff, TRUE),
69
70 /* We have a gap in the reloc numbers here.
71 R_386_standard counts the number up to this point, and
72 R_386_ext_offset is the value to subtract from a reloc type of
73 R_386_16 thru R_386_PC8 to form an index into this table. */
74 #define R_386_standard (R_386_GOTPC + 1)
75 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
76
77 /* These relocs are a GNU extension. */
78 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
79 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
80 TRUE, 0xffffffff, 0xffffffff, FALSE),
81 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_386_TLS_IE",
83 TRUE, 0xffffffff, 0xffffffff, FALSE),
84 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_LE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_GD",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_LDM",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_16",
98 TRUE, 0xffff, 0xffff, FALSE),
99 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_PC16",
101 TRUE, 0xffff, 0xffff, TRUE),
102 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_8",
104 TRUE, 0xff, 0xff, FALSE),
105 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
106 bfd_elf_generic_reloc, "R_386_PC8",
107 TRUE, 0xff, 0xff, TRUE),
108
109 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
110 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
111 /* These are common with Solaris TLS implementation. */
112 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
113 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
114 TRUE, 0xffffffff, 0xffffffff, FALSE),
115 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
117 TRUE, 0xffffffff, 0xffffffff, FALSE),
118 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 EMPTY_HOWTO (38),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
136 FALSE, 0, 0, FALSE),
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140
141 /* Another gap. */
142 #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset)
143 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
144
145 /* GNU extension to record C++ vtable hierarchy. */
146 HOWTO (R_386_GNU_VTINHERIT, /* type */
147 0, /* rightshift */
148 2, /* size (0 = byte, 1 = short, 2 = long) */
149 0, /* bitsize */
150 FALSE, /* pc_relative */
151 0, /* bitpos */
152 complain_overflow_dont, /* complain_on_overflow */
153 NULL, /* special_function */
154 "R_386_GNU_VTINHERIT", /* name */
155 FALSE, /* partial_inplace */
156 0, /* src_mask */
157 0, /* dst_mask */
158 FALSE), /* pcrel_offset */
159
160 /* GNU extension to record C++ vtable member usage. */
161 HOWTO (R_386_GNU_VTENTRY, /* type */
162 0, /* rightshift */
163 2, /* size (0 = byte, 1 = short, 2 = long) */
164 0, /* bitsize */
165 FALSE, /* pc_relative */
166 0, /* bitpos */
167 complain_overflow_dont, /* complain_on_overflow */
168 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
169 "R_386_GNU_VTENTRY", /* name */
170 FALSE, /* partial_inplace */
171 0, /* src_mask */
172 0, /* dst_mask */
173 FALSE) /* pcrel_offset */
174
175 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
176
177 };
178
179 #ifdef DEBUG_GEN_RELOC
180 #define TRACE(str) \
181 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
182 #else
183 #define TRACE(str)
184 #endif
185
186 static reloc_howto_type *
187 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
188 bfd_reloc_code_real_type code)
189 {
190 switch (code)
191 {
192 case BFD_RELOC_NONE:
193 TRACE ("BFD_RELOC_NONE");
194 return &elf_howto_table[R_386_NONE];
195
196 case BFD_RELOC_32:
197 TRACE ("BFD_RELOC_32");
198 return &elf_howto_table[R_386_32];
199
200 case BFD_RELOC_CTOR:
201 TRACE ("BFD_RELOC_CTOR");
202 return &elf_howto_table[R_386_32];
203
204 case BFD_RELOC_32_PCREL:
205 TRACE ("BFD_RELOC_PC32");
206 return &elf_howto_table[R_386_PC32];
207
208 case BFD_RELOC_386_GOT32:
209 TRACE ("BFD_RELOC_386_GOT32");
210 return &elf_howto_table[R_386_GOT32];
211
212 case BFD_RELOC_386_PLT32:
213 TRACE ("BFD_RELOC_386_PLT32");
214 return &elf_howto_table[R_386_PLT32];
215
216 case BFD_RELOC_386_COPY:
217 TRACE ("BFD_RELOC_386_COPY");
218 return &elf_howto_table[R_386_COPY];
219
220 case BFD_RELOC_386_GLOB_DAT:
221 TRACE ("BFD_RELOC_386_GLOB_DAT");
222 return &elf_howto_table[R_386_GLOB_DAT];
223
224 case BFD_RELOC_386_JUMP_SLOT:
225 TRACE ("BFD_RELOC_386_JUMP_SLOT");
226 return &elf_howto_table[R_386_JUMP_SLOT];
227
228 case BFD_RELOC_386_RELATIVE:
229 TRACE ("BFD_RELOC_386_RELATIVE");
230 return &elf_howto_table[R_386_RELATIVE];
231
232 case BFD_RELOC_386_GOTOFF:
233 TRACE ("BFD_RELOC_386_GOTOFF");
234 return &elf_howto_table[R_386_GOTOFF];
235
236 case BFD_RELOC_386_GOTPC:
237 TRACE ("BFD_RELOC_386_GOTPC");
238 return &elf_howto_table[R_386_GOTPC];
239
240 /* These relocs are a GNU extension. */
241 case BFD_RELOC_386_TLS_TPOFF:
242 TRACE ("BFD_RELOC_386_TLS_TPOFF");
243 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
244
245 case BFD_RELOC_386_TLS_IE:
246 TRACE ("BFD_RELOC_386_TLS_IE");
247 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
248
249 case BFD_RELOC_386_TLS_GOTIE:
250 TRACE ("BFD_RELOC_386_TLS_GOTIE");
251 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
252
253 case BFD_RELOC_386_TLS_LE:
254 TRACE ("BFD_RELOC_386_TLS_LE");
255 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
256
257 case BFD_RELOC_386_TLS_GD:
258 TRACE ("BFD_RELOC_386_TLS_GD");
259 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
260
261 case BFD_RELOC_386_TLS_LDM:
262 TRACE ("BFD_RELOC_386_TLS_LDM");
263 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
264
265 case BFD_RELOC_16:
266 TRACE ("BFD_RELOC_16");
267 return &elf_howto_table[R_386_16 - R_386_ext_offset];
268
269 case BFD_RELOC_16_PCREL:
270 TRACE ("BFD_RELOC_16_PCREL");
271 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
272
273 case BFD_RELOC_8:
274 TRACE ("BFD_RELOC_8");
275 return &elf_howto_table[R_386_8 - R_386_ext_offset];
276
277 case BFD_RELOC_8_PCREL:
278 TRACE ("BFD_RELOC_8_PCREL");
279 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
280
281 /* Common with Sun TLS implementation. */
282 case BFD_RELOC_386_TLS_LDO_32:
283 TRACE ("BFD_RELOC_386_TLS_LDO_32");
284 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
285
286 case BFD_RELOC_386_TLS_IE_32:
287 TRACE ("BFD_RELOC_386_TLS_IE_32");
288 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
289
290 case BFD_RELOC_386_TLS_LE_32:
291 TRACE ("BFD_RELOC_386_TLS_LE_32");
292 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
293
294 case BFD_RELOC_386_TLS_DTPMOD32:
295 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
296 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
297
298 case BFD_RELOC_386_TLS_DTPOFF32:
299 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
300 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
301
302 case BFD_RELOC_386_TLS_TPOFF32:
303 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
304 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
305
306 case BFD_RELOC_386_TLS_GOTDESC:
307 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
308 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
309
310 case BFD_RELOC_386_TLS_DESC_CALL:
311 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
312 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
313
314 case BFD_RELOC_386_TLS_DESC:
315 TRACE ("BFD_RELOC_386_TLS_DESC");
316 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
317
318 case BFD_RELOC_VTABLE_INHERIT:
319 TRACE ("BFD_RELOC_VTABLE_INHERIT");
320 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
321
322 case BFD_RELOC_VTABLE_ENTRY:
323 TRACE ("BFD_RELOC_VTABLE_ENTRY");
324 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
325
326 default:
327 break;
328 }
329
330 TRACE ("Unknown");
331 return 0;
332 }
333
334 static reloc_howto_type *
335 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
336 const char *r_name)
337 {
338 unsigned int i;
339
340 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
341 if (elf_howto_table[i].name != NULL
342 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
343 return &elf_howto_table[i];
344
345 return NULL;
346 }
347
348 static void
349 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
350 arelent *cache_ptr,
351 Elf_Internal_Rela *dst)
352 {
353 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
354 unsigned int indx;
355
356 if ((indx = r_type) >= R_386_standard
357 && ((indx = r_type - R_386_ext_offset) - R_386_standard
358 >= R_386_ext - R_386_standard)
359 && ((indx = r_type - R_386_tls_offset) - R_386_ext
360 >= R_386_tls - R_386_ext)
361 && ((indx = r_type - R_386_vt_offset) - R_386_tls
362 >= R_386_vt - R_386_tls))
363 {
364 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
365 abfd, (int) r_type);
366 indx = R_386_NONE;
367 }
368 cache_ptr->howto = &elf_howto_table[indx];
369 }
370
371 /* Return whether a symbol name implies a local label. The UnixWare
372 2.1 cc generates temporary symbols that start with .X, so we
373 recognize them here. FIXME: do other SVR4 compilers also use .X?.
374 If so, we should move the .X recognition into
375 _bfd_elf_is_local_label_name. */
376
377 static bfd_boolean
378 elf_i386_is_local_label_name (bfd *abfd, const char *name)
379 {
380 if (name[0] == '.' && name[1] == 'X')
381 return TRUE;
382
383 return _bfd_elf_is_local_label_name (abfd, name);
384 }
385 \f
386 /* Support for core dump NOTE sections. */
387
388 static bfd_boolean
389 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
390 {
391 int offset;
392 size_t size;
393
394 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
395 {
396 int pr_version = bfd_get_32 (abfd, note->descdata);
397
398 if (pr_version != 1)
399 return FALSE;
400
401 /* pr_cursig */
402 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
403
404 /* pr_pid */
405 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
406
407 /* pr_reg */
408 offset = 28;
409 size = bfd_get_32 (abfd, note->descdata + 8);
410 }
411 else
412 {
413 switch (note->descsz)
414 {
415 default:
416 return FALSE;
417
418 case 144: /* Linux/i386 */
419 /* pr_cursig */
420 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
421
422 /* pr_pid */
423 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
424
425 /* pr_reg */
426 offset = 72;
427 size = 68;
428
429 break;
430 }
431 }
432
433 /* Make a ".reg/999" section. */
434 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
435 size, note->descpos + offset);
436 }
437
438 static bfd_boolean
439 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
440 {
441 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
442 {
443 int pr_version = bfd_get_32 (abfd, note->descdata);
444
445 if (pr_version != 1)
446 return FALSE;
447
448 elf_tdata (abfd)->core_program
449 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
450 elf_tdata (abfd)->core_command
451 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
452 }
453 else
454 {
455 switch (note->descsz)
456 {
457 default:
458 return FALSE;
459
460 case 124: /* Linux/i386 elf_prpsinfo. */
461 elf_tdata (abfd)->core_program
462 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
463 elf_tdata (abfd)->core_command
464 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
465 }
466 }
467
468 /* Note that for some reason, a spurious space is tacked
469 onto the end of the args in some (at least one anyway)
470 implementations, so strip it off if it exists. */
471 {
472 char *command = elf_tdata (abfd)->core_command;
473 int n = strlen (command);
474
475 if (0 < n && command[n - 1] == ' ')
476 command[n - 1] = '\0';
477 }
478
479 return TRUE;
480 }
481 \f
482 /* Functions for the i386 ELF linker.
483
484 In order to gain some understanding of code in this file without
485 knowing all the intricate details of the linker, note the
486 following:
487
488 Functions named elf_i386_* are called by external routines, other
489 functions are only called locally. elf_i386_* functions appear
490 in this file more or less in the order in which they are called
491 from external routines. eg. elf_i386_check_relocs is called
492 early in the link process, elf_i386_finish_dynamic_sections is
493 one of the last functions. */
494
495
496 /* The name of the dynamic interpreter. This is put in the .interp
497 section. */
498
499 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
500
501 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
502 copying dynamic variables from a shared lib into an app's dynbss
503 section, and instead use a dynamic relocation to point into the
504 shared lib. */
505 #define ELIMINATE_COPY_RELOCS 1
506
507 /* The size in bytes of an entry in the procedure linkage table. */
508
509 #define PLT_ENTRY_SIZE 16
510
511 /* The first entry in an absolute procedure linkage table looks like
512 this. See the SVR4 ABI i386 supplement to see how this works.
513 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
514
515 static const bfd_byte elf_i386_plt0_entry[12] =
516 {
517 0xff, 0x35, /* pushl contents of address */
518 0, 0, 0, 0, /* replaced with address of .got + 4. */
519 0xff, 0x25, /* jmp indirect */
520 0, 0, 0, 0 /* replaced with address of .got + 8. */
521 };
522
523 /* Subsequent entries in an absolute procedure linkage table look like
524 this. */
525
526 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
527 {
528 0xff, 0x25, /* jmp indirect */
529 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
530 0x68, /* pushl immediate */
531 0, 0, 0, 0, /* replaced with offset into relocation table. */
532 0xe9, /* jmp relative */
533 0, 0, 0, 0 /* replaced with offset to start of .plt. */
534 };
535
536 /* The first entry in a PIC procedure linkage table look like this.
537 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
538
539 static const bfd_byte elf_i386_pic_plt0_entry[12] =
540 {
541 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
542 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
543 };
544
545 /* Subsequent entries in a PIC procedure linkage table look like this. */
546
547 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
548 {
549 0xff, 0xa3, /* jmp *offset(%ebx) */
550 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
551 0x68, /* pushl immediate */
552 0, 0, 0, 0, /* replaced with offset into relocation table. */
553 0xe9, /* jmp relative */
554 0, 0, 0, 0 /* replaced with offset to start of .plt. */
555 };
556
557 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
558 for the PLTResolve stub and then for each PLT entry. */
559 #define PLTRESOLVE_RELOCS_SHLIB 0
560 #define PLTRESOLVE_RELOCS 2
561 #define PLT_NON_JUMP_SLOT_RELOCS 2
562
563 /* The i386 linker needs to keep track of the number of relocs that it
564 decides to copy as dynamic relocs in check_relocs for each symbol.
565 This is so that it can later discard them if they are found to be
566 unnecessary. We store the information in a field extending the
567 regular ELF linker hash table. */
568
569 struct elf_i386_dyn_relocs
570 {
571 struct elf_i386_dyn_relocs *next;
572
573 /* The input section of the reloc. */
574 asection *sec;
575
576 /* Total number of relocs copied for the input section. */
577 bfd_size_type count;
578
579 /* Number of pc-relative relocs copied for the input section. */
580 bfd_size_type pc_count;
581 };
582
583 /* i386 ELF linker hash entry. */
584
585 struct elf_i386_link_hash_entry
586 {
587 struct elf_link_hash_entry elf;
588
589 /* Track dynamic relocs copied for this symbol. */
590 struct elf_i386_dyn_relocs *dyn_relocs;
591
592 #define GOT_UNKNOWN 0
593 #define GOT_NORMAL 1
594 #define GOT_TLS_GD 2
595 #define GOT_TLS_IE 4
596 #define GOT_TLS_IE_POS 5
597 #define GOT_TLS_IE_NEG 6
598 #define GOT_TLS_IE_BOTH 7
599 #define GOT_TLS_GDESC 8
600 #define GOT_TLS_GD_BOTH_P(type) \
601 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
602 #define GOT_TLS_GD_P(type) \
603 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
604 #define GOT_TLS_GDESC_P(type) \
605 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
606 #define GOT_TLS_GD_ANY_P(type) \
607 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
608 unsigned char tls_type;
609
610 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
611 starting at the end of the jump table. */
612 bfd_vma tlsdesc_got;
613 };
614
615 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
616
617 struct elf_i386_obj_tdata
618 {
619 struct elf_obj_tdata root;
620
621 /* tls_type for each local got entry. */
622 char *local_got_tls_type;
623
624 /* GOTPLT entries for TLS descriptors. */
625 bfd_vma *local_tlsdesc_gotent;
626 };
627
628 #define elf_i386_tdata(abfd) \
629 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
630
631 #define elf_i386_local_got_tls_type(abfd) \
632 (elf_i386_tdata (abfd)->local_got_tls_type)
633
634 #define elf_i386_local_tlsdesc_gotent(abfd) \
635 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
636
637 static bfd_boolean
638 elf_i386_mkobject (bfd *abfd)
639 {
640 if (abfd->tdata.any == NULL)
641 {
642 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
643 abfd->tdata.any = bfd_zalloc (abfd, amt);
644 if (abfd->tdata.any == NULL)
645 return FALSE;
646 }
647 return bfd_elf_mkobject (abfd);
648 }
649
650 /* i386 ELF linker hash table. */
651
652 struct elf_i386_link_hash_table
653 {
654 struct elf_link_hash_table elf;
655
656 /* Short-cuts to get to dynamic linker sections. */
657 asection *sgot;
658 asection *sgotplt;
659 asection *srelgot;
660 asection *splt;
661 asection *srelplt;
662 asection *sdynbss;
663 asection *srelbss;
664
665 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
666 asection *srelplt2;
667
668 /* True if the target system is VxWorks. */
669 int is_vxworks;
670
671 /* Value used to fill the last word of the first plt entry. */
672 bfd_byte plt0_pad_byte;
673
674 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
675 bfd_vma next_tls_desc_index;
676
677 union {
678 bfd_signed_vma refcount;
679 bfd_vma offset;
680 } tls_ldm_got;
681
682 /* The amount of space used by the reserved portion of the sgotplt
683 section, plus whatever space is used by the jump slots. */
684 bfd_vma sgotplt_jump_table_size;
685
686 /* Small local sym to section mapping cache. */
687 struct sym_sec_cache sym_sec;
688 };
689
690 /* Get the i386 ELF linker hash table from a link_info structure. */
691
692 #define elf_i386_hash_table(p) \
693 ((struct elf_i386_link_hash_table *) ((p)->hash))
694
695 #define elf_i386_compute_jump_table_size(htab) \
696 ((htab)->next_tls_desc_index * 4)
697
698 /* Create an entry in an i386 ELF linker hash table. */
699
700 static struct bfd_hash_entry *
701 link_hash_newfunc (struct bfd_hash_entry *entry,
702 struct bfd_hash_table *table,
703 const char *string)
704 {
705 /* Allocate the structure if it has not already been allocated by a
706 subclass. */
707 if (entry == NULL)
708 {
709 entry = bfd_hash_allocate (table,
710 sizeof (struct elf_i386_link_hash_entry));
711 if (entry == NULL)
712 return entry;
713 }
714
715 /* Call the allocation method of the superclass. */
716 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
717 if (entry != NULL)
718 {
719 struct elf_i386_link_hash_entry *eh;
720
721 eh = (struct elf_i386_link_hash_entry *) entry;
722 eh->dyn_relocs = NULL;
723 eh->tls_type = GOT_UNKNOWN;
724 eh->tlsdesc_got = (bfd_vma) -1;
725 }
726
727 return entry;
728 }
729
730 /* Create an i386 ELF linker hash table. */
731
732 static struct bfd_link_hash_table *
733 elf_i386_link_hash_table_create (bfd *abfd)
734 {
735 struct elf_i386_link_hash_table *ret;
736 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
737
738 ret = bfd_malloc (amt);
739 if (ret == NULL)
740 return NULL;
741
742 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
743 sizeof (struct elf_i386_link_hash_entry)))
744 {
745 free (ret);
746 return NULL;
747 }
748
749 ret->sgot = NULL;
750 ret->sgotplt = NULL;
751 ret->srelgot = NULL;
752 ret->splt = NULL;
753 ret->srelplt = NULL;
754 ret->sdynbss = NULL;
755 ret->srelbss = NULL;
756 ret->tls_ldm_got.refcount = 0;
757 ret->next_tls_desc_index = 0;
758 ret->sgotplt_jump_table_size = 0;
759 ret->sym_sec.abfd = NULL;
760 ret->is_vxworks = 0;
761 ret->srelplt2 = NULL;
762 ret->plt0_pad_byte = 0;
763
764 return &ret->elf.root;
765 }
766
767 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
768 shortcuts to them in our hash table. */
769
770 static bfd_boolean
771 create_got_section (bfd *dynobj, struct bfd_link_info *info)
772 {
773 struct elf_i386_link_hash_table *htab;
774
775 if (! _bfd_elf_create_got_section (dynobj, info))
776 return FALSE;
777
778 htab = elf_i386_hash_table (info);
779 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
780 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
781 if (!htab->sgot || !htab->sgotplt)
782 abort ();
783
784 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
785 (SEC_ALLOC | SEC_LOAD
786 | SEC_HAS_CONTENTS
787 | SEC_IN_MEMORY
788 | SEC_LINKER_CREATED
789 | SEC_READONLY));
790 if (htab->srelgot == NULL
791 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
792 return FALSE;
793 return TRUE;
794 }
795
796 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
797 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
798 hash table. */
799
800 static bfd_boolean
801 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
802 {
803 struct elf_i386_link_hash_table *htab;
804
805 htab = elf_i386_hash_table (info);
806 if (!htab->sgot && !create_got_section (dynobj, info))
807 return FALSE;
808
809 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
810 return FALSE;
811
812 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
813 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
814 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
815 if (!info->shared)
816 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
817
818 if (!htab->splt || !htab->srelplt || !htab->sdynbss
819 || (!info->shared && !htab->srelbss))
820 abort ();
821
822 if (htab->is_vxworks
823 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2))
824 return FALSE;
825
826 return TRUE;
827 }
828
829 /* Copy the extra info we tack onto an elf_link_hash_entry. */
830
831 static void
832 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
833 struct elf_link_hash_entry *dir,
834 struct elf_link_hash_entry *ind)
835 {
836 struct elf_i386_link_hash_entry *edir, *eind;
837
838 edir = (struct elf_i386_link_hash_entry *) dir;
839 eind = (struct elf_i386_link_hash_entry *) ind;
840
841 if (eind->dyn_relocs != NULL)
842 {
843 if (edir->dyn_relocs != NULL)
844 {
845 struct elf_i386_dyn_relocs **pp;
846 struct elf_i386_dyn_relocs *p;
847
848 /* Add reloc counts against the indirect sym to the direct sym
849 list. Merge any entries against the same section. */
850 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
851 {
852 struct elf_i386_dyn_relocs *q;
853
854 for (q = edir->dyn_relocs; q != NULL; q = q->next)
855 if (q->sec == p->sec)
856 {
857 q->pc_count += p->pc_count;
858 q->count += p->count;
859 *pp = p->next;
860 break;
861 }
862 if (q == NULL)
863 pp = &p->next;
864 }
865 *pp = edir->dyn_relocs;
866 }
867
868 edir->dyn_relocs = eind->dyn_relocs;
869 eind->dyn_relocs = NULL;
870 }
871
872 if (ind->root.type == bfd_link_hash_indirect
873 && dir->got.refcount <= 0)
874 {
875 edir->tls_type = eind->tls_type;
876 eind->tls_type = GOT_UNKNOWN;
877 }
878
879 if (ELIMINATE_COPY_RELOCS
880 && ind->root.type != bfd_link_hash_indirect
881 && dir->dynamic_adjusted)
882 {
883 /* If called to transfer flags for a weakdef during processing
884 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
885 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
886 dir->ref_dynamic |= ind->ref_dynamic;
887 dir->ref_regular |= ind->ref_regular;
888 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
889 dir->needs_plt |= ind->needs_plt;
890 dir->pointer_equality_needed |= ind->pointer_equality_needed;
891 }
892 else
893 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
894 }
895
896 static int
897 elf_i386_tls_transition (struct bfd_link_info *info, int r_type,
898 struct elf_link_hash_entry *h)
899 {
900 if (info->shared)
901 return r_type;
902
903 switch (r_type)
904 {
905 case R_386_TLS_GD:
906 case R_386_TLS_GOTDESC:
907 case R_386_TLS_DESC_CALL:
908 case R_386_TLS_IE_32:
909 if (h == NULL)
910 return R_386_TLS_LE_32;
911 return R_386_TLS_IE_32;
912 case R_386_TLS_IE:
913 case R_386_TLS_GOTIE:
914 if (h == NULL)
915 return R_386_TLS_LE_32;
916 return r_type;
917 case R_386_TLS_LDM:
918 return R_386_TLS_LE_32;
919 }
920
921 return r_type;
922 }
923
924 /* Look through the relocs for a section during the first phase, and
925 calculate needed space in the global offset table, procedure linkage
926 table, and dynamic reloc sections. */
927
928 static bfd_boolean
929 elf_i386_check_relocs (bfd *abfd,
930 struct bfd_link_info *info,
931 asection *sec,
932 const Elf_Internal_Rela *relocs)
933 {
934 struct elf_i386_link_hash_table *htab;
935 Elf_Internal_Shdr *symtab_hdr;
936 struct elf_link_hash_entry **sym_hashes;
937 const Elf_Internal_Rela *rel;
938 const Elf_Internal_Rela *rel_end;
939 asection *sreloc;
940
941 if (info->relocatable)
942 return TRUE;
943
944 htab = elf_i386_hash_table (info);
945 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
946 sym_hashes = elf_sym_hashes (abfd);
947
948 sreloc = NULL;
949
950 rel_end = relocs + sec->reloc_count;
951 for (rel = relocs; rel < rel_end; rel++)
952 {
953 unsigned int r_type;
954 unsigned long r_symndx;
955 struct elf_link_hash_entry *h;
956
957 r_symndx = ELF32_R_SYM (rel->r_info);
958 r_type = ELF32_R_TYPE (rel->r_info);
959
960 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
961 {
962 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
963 abfd,
964 r_symndx);
965 return FALSE;
966 }
967
968 if (r_symndx < symtab_hdr->sh_info)
969 h = NULL;
970 else
971 {
972 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
973 while (h->root.type == bfd_link_hash_indirect
974 || h->root.type == bfd_link_hash_warning)
975 h = (struct elf_link_hash_entry *) h->root.u.i.link;
976 }
977
978 r_type = elf_i386_tls_transition (info, r_type, h);
979
980 switch (r_type)
981 {
982 case R_386_TLS_LDM:
983 htab->tls_ldm_got.refcount += 1;
984 goto create_got;
985
986 case R_386_PLT32:
987 /* This symbol requires a procedure linkage table entry. We
988 actually build the entry in adjust_dynamic_symbol,
989 because this might be a case of linking PIC code which is
990 never referenced by a dynamic object, in which case we
991 don't need to generate a procedure linkage table entry
992 after all. */
993
994 /* If this is a local symbol, we resolve it directly without
995 creating a procedure linkage table entry. */
996 if (h == NULL)
997 continue;
998
999 h->needs_plt = 1;
1000 h->plt.refcount += 1;
1001 break;
1002
1003 case R_386_TLS_IE_32:
1004 case R_386_TLS_IE:
1005 case R_386_TLS_GOTIE:
1006 if (info->shared)
1007 info->flags |= DF_STATIC_TLS;
1008 /* Fall through */
1009
1010 case R_386_GOT32:
1011 case R_386_TLS_GD:
1012 case R_386_TLS_GOTDESC:
1013 case R_386_TLS_DESC_CALL:
1014 /* This symbol requires a global offset table entry. */
1015 {
1016 int tls_type, old_tls_type;
1017
1018 switch (r_type)
1019 {
1020 default:
1021 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1022 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1023 case R_386_TLS_GOTDESC:
1024 case R_386_TLS_DESC_CALL:
1025 tls_type = GOT_TLS_GDESC; break;
1026 case R_386_TLS_IE_32:
1027 if (ELF32_R_TYPE (rel->r_info) == r_type)
1028 tls_type = GOT_TLS_IE_NEG;
1029 else
1030 /* If this is a GD->IE transition, we may use either of
1031 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1032 tls_type = GOT_TLS_IE;
1033 break;
1034 case R_386_TLS_IE:
1035 case R_386_TLS_GOTIE:
1036 tls_type = GOT_TLS_IE_POS; break;
1037 }
1038
1039 if (h != NULL)
1040 {
1041 h->got.refcount += 1;
1042 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1043 }
1044 else
1045 {
1046 bfd_signed_vma *local_got_refcounts;
1047
1048 /* This is a global offset table entry for a local symbol. */
1049 local_got_refcounts = elf_local_got_refcounts (abfd);
1050 if (local_got_refcounts == NULL)
1051 {
1052 bfd_size_type size;
1053
1054 size = symtab_hdr->sh_info;
1055 size *= (sizeof (bfd_signed_vma)
1056 + sizeof (bfd_vma) + sizeof(char));
1057 local_got_refcounts = bfd_zalloc (abfd, size);
1058 if (local_got_refcounts == NULL)
1059 return FALSE;
1060 elf_local_got_refcounts (abfd) = local_got_refcounts;
1061 elf_i386_local_tlsdesc_gotent (abfd)
1062 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1063 elf_i386_local_got_tls_type (abfd)
1064 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1065 }
1066 local_got_refcounts[r_symndx] += 1;
1067 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1068 }
1069
1070 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1071 tls_type |= old_tls_type;
1072 /* If a TLS symbol is accessed using IE at least once,
1073 there is no point to use dynamic model for it. */
1074 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1075 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1076 || (tls_type & GOT_TLS_IE) == 0))
1077 {
1078 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1079 tls_type = old_tls_type;
1080 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1081 && GOT_TLS_GD_ANY_P (tls_type))
1082 tls_type |= old_tls_type;
1083 else
1084 {
1085 (*_bfd_error_handler)
1086 (_("%B: `%s' accessed both as normal and "
1087 "thread local symbol"),
1088 abfd,
1089 h ? h->root.root.string : "<local>");
1090 return FALSE;
1091 }
1092 }
1093
1094 if (old_tls_type != tls_type)
1095 {
1096 if (h != NULL)
1097 elf_i386_hash_entry (h)->tls_type = tls_type;
1098 else
1099 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1100 }
1101 }
1102 /* Fall through */
1103
1104 case R_386_GOTOFF:
1105 case R_386_GOTPC:
1106 create_got:
1107 if (htab->sgot == NULL)
1108 {
1109 if (htab->elf.dynobj == NULL)
1110 htab->elf.dynobj = abfd;
1111 if (!create_got_section (htab->elf.dynobj, info))
1112 return FALSE;
1113 }
1114 if (r_type != R_386_TLS_IE)
1115 break;
1116 /* Fall through */
1117
1118 case R_386_TLS_LE_32:
1119 case R_386_TLS_LE:
1120 if (!info->shared)
1121 break;
1122 info->flags |= DF_STATIC_TLS;
1123 /* Fall through */
1124
1125 case R_386_32:
1126 case R_386_PC32:
1127 if (h != NULL && !info->shared)
1128 {
1129 /* If this reloc is in a read-only section, we might
1130 need a copy reloc. We can't check reliably at this
1131 stage whether the section is read-only, as input
1132 sections have not yet been mapped to output sections.
1133 Tentatively set the flag for now, and correct in
1134 adjust_dynamic_symbol. */
1135 h->non_got_ref = 1;
1136
1137 /* We may need a .plt entry if the function this reloc
1138 refers to is in a shared lib. */
1139 h->plt.refcount += 1;
1140 if (r_type != R_386_PC32)
1141 h->pointer_equality_needed = 1;
1142 }
1143
1144 /* If we are creating a shared library, and this is a reloc
1145 against a global symbol, or a non PC relative reloc
1146 against a local symbol, then we need to copy the reloc
1147 into the shared library. However, if we are linking with
1148 -Bsymbolic, we do not need to copy a reloc against a
1149 global symbol which is defined in an object we are
1150 including in the link (i.e., DEF_REGULAR is set). At
1151 this point we have not seen all the input files, so it is
1152 possible that DEF_REGULAR is not set now but will be set
1153 later (it is never cleared). In case of a weak definition,
1154 DEF_REGULAR may be cleared later by a strong definition in
1155 a shared library. We account for that possibility below by
1156 storing information in the relocs_copied field of the hash
1157 table entry. A similar situation occurs when creating
1158 shared libraries and symbol visibility changes render the
1159 symbol local.
1160
1161 If on the other hand, we are creating an executable, we
1162 may need to keep relocations for symbols satisfied by a
1163 dynamic library if we manage to avoid copy relocs for the
1164 symbol. */
1165 if ((info->shared
1166 && (sec->flags & SEC_ALLOC) != 0
1167 && (r_type != R_386_PC32
1168 || (h != NULL
1169 && (! SYMBOLIC_BIND (info, h)
1170 || h->root.type == bfd_link_hash_defweak
1171 || !h->def_regular))))
1172 || (ELIMINATE_COPY_RELOCS
1173 && !info->shared
1174 && (sec->flags & SEC_ALLOC) != 0
1175 && h != NULL
1176 && (h->root.type == bfd_link_hash_defweak
1177 || !h->def_regular)))
1178 {
1179 struct elf_i386_dyn_relocs *p;
1180 struct elf_i386_dyn_relocs **head;
1181
1182 /* We must copy these reloc types into the output file.
1183 Create a reloc section in dynobj and make room for
1184 this reloc. */
1185 if (sreloc == NULL)
1186 {
1187 const char *name;
1188 bfd *dynobj;
1189 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1190 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1191
1192 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1193 if (name == NULL)
1194 return FALSE;
1195
1196 if (! CONST_STRNEQ (name, ".rel")
1197 || strcmp (bfd_get_section_name (abfd, sec),
1198 name + 4) != 0)
1199 {
1200 (*_bfd_error_handler)
1201 (_("%B: bad relocation section name `%s\'"),
1202 abfd, name);
1203 }
1204
1205 if (htab->elf.dynobj == NULL)
1206 htab->elf.dynobj = abfd;
1207
1208 dynobj = htab->elf.dynobj;
1209 sreloc = bfd_get_section_by_name (dynobj, name);
1210 if (sreloc == NULL)
1211 {
1212 flagword flags;
1213
1214 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1215 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1216 if ((sec->flags & SEC_ALLOC) != 0)
1217 flags |= SEC_ALLOC | SEC_LOAD;
1218 sreloc = bfd_make_section_with_flags (dynobj,
1219 name,
1220 flags);
1221 if (sreloc == NULL
1222 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1223 return FALSE;
1224 }
1225 elf_section_data (sec)->sreloc = sreloc;
1226 }
1227
1228 /* If this is a global symbol, we count the number of
1229 relocations we need for this symbol. */
1230 if (h != NULL)
1231 {
1232 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1233 }
1234 else
1235 {
1236 void **vpp;
1237 /* Track dynamic relocs needed for local syms too.
1238 We really need local syms available to do this
1239 easily. Oh well. */
1240
1241 asection *s;
1242 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1243 sec, r_symndx);
1244 if (s == NULL)
1245 return FALSE;
1246
1247 vpp = &elf_section_data (s)->local_dynrel;
1248 head = (struct elf_i386_dyn_relocs **)vpp;
1249 }
1250
1251 p = *head;
1252 if (p == NULL || p->sec != sec)
1253 {
1254 bfd_size_type amt = sizeof *p;
1255 p = bfd_alloc (htab->elf.dynobj, amt);
1256 if (p == NULL)
1257 return FALSE;
1258 p->next = *head;
1259 *head = p;
1260 p->sec = sec;
1261 p->count = 0;
1262 p->pc_count = 0;
1263 }
1264
1265 p->count += 1;
1266 if (r_type == R_386_PC32)
1267 p->pc_count += 1;
1268 }
1269 break;
1270
1271 /* This relocation describes the C++ object vtable hierarchy.
1272 Reconstruct it for later use during GC. */
1273 case R_386_GNU_VTINHERIT:
1274 BFD_ASSERT (h != NULL);
1275 if (h != NULL
1276 && !bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1277 return FALSE;
1278 break;
1279
1280 /* This relocation describes which C++ vtable entries are actually
1281 used. Record for later use during GC. */
1282 case R_386_GNU_VTENTRY:
1283 BFD_ASSERT (h != NULL);
1284 if (h != NULL
1285 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1286 return FALSE;
1287 break;
1288
1289 default:
1290 break;
1291 }
1292 }
1293
1294 return TRUE;
1295 }
1296
1297 /* Return the section that should be marked against GC for a given
1298 relocation. */
1299
1300 static asection *
1301 elf_i386_gc_mark_hook (asection *sec,
1302 struct bfd_link_info *info,
1303 Elf_Internal_Rela *rel,
1304 struct elf_link_hash_entry *h,
1305 Elf_Internal_Sym *sym)
1306 {
1307 if (h != NULL)
1308 switch (ELF32_R_TYPE (rel->r_info))
1309 {
1310 case R_386_GNU_VTINHERIT:
1311 case R_386_GNU_VTENTRY:
1312 return NULL;
1313 }
1314
1315 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1316 }
1317
1318 /* Update the got entry reference counts for the section being removed. */
1319
1320 static bfd_boolean
1321 elf_i386_gc_sweep_hook (bfd *abfd,
1322 struct bfd_link_info *info,
1323 asection *sec,
1324 const Elf_Internal_Rela *relocs)
1325 {
1326 Elf_Internal_Shdr *symtab_hdr;
1327 struct elf_link_hash_entry **sym_hashes;
1328 bfd_signed_vma *local_got_refcounts;
1329 const Elf_Internal_Rela *rel, *relend;
1330
1331 elf_section_data (sec)->local_dynrel = NULL;
1332
1333 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1334 sym_hashes = elf_sym_hashes (abfd);
1335 local_got_refcounts = elf_local_got_refcounts (abfd);
1336
1337 relend = relocs + sec->reloc_count;
1338 for (rel = relocs; rel < relend; rel++)
1339 {
1340 unsigned long r_symndx;
1341 unsigned int r_type;
1342 struct elf_link_hash_entry *h = NULL;
1343
1344 r_symndx = ELF32_R_SYM (rel->r_info);
1345 if (r_symndx >= symtab_hdr->sh_info)
1346 {
1347 struct elf_i386_link_hash_entry *eh;
1348 struct elf_i386_dyn_relocs **pp;
1349 struct elf_i386_dyn_relocs *p;
1350
1351 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1352 while (h->root.type == bfd_link_hash_indirect
1353 || h->root.type == bfd_link_hash_warning)
1354 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1355 eh = (struct elf_i386_link_hash_entry *) h;
1356
1357 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1358 if (p->sec == sec)
1359 {
1360 /* Everything must go for SEC. */
1361 *pp = p->next;
1362 break;
1363 }
1364 }
1365
1366 r_type = ELF32_R_TYPE (rel->r_info);
1367 r_type = elf_i386_tls_transition (info, r_type, h);
1368 switch (r_type)
1369 {
1370 case R_386_TLS_LDM:
1371 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1372 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1373 break;
1374
1375 case R_386_TLS_GD:
1376 case R_386_TLS_GOTDESC:
1377 case R_386_TLS_DESC_CALL:
1378 case R_386_TLS_IE_32:
1379 case R_386_TLS_IE:
1380 case R_386_TLS_GOTIE:
1381 case R_386_GOT32:
1382 if (h != NULL)
1383 {
1384 if (h->got.refcount > 0)
1385 h->got.refcount -= 1;
1386 }
1387 else if (local_got_refcounts != NULL)
1388 {
1389 if (local_got_refcounts[r_symndx] > 0)
1390 local_got_refcounts[r_symndx] -= 1;
1391 }
1392 break;
1393
1394 case R_386_32:
1395 case R_386_PC32:
1396 if (info->shared)
1397 break;
1398 /* Fall through */
1399
1400 case R_386_PLT32:
1401 if (h != NULL)
1402 {
1403 if (h->plt.refcount > 0)
1404 h->plt.refcount -= 1;
1405 }
1406 break;
1407
1408 default:
1409 break;
1410 }
1411 }
1412
1413 return TRUE;
1414 }
1415
1416 /* Adjust a symbol defined by a dynamic object and referenced by a
1417 regular object. The current definition is in some section of the
1418 dynamic object, but we're not including those sections. We have to
1419 change the definition to something the rest of the link can
1420 understand. */
1421
1422 static bfd_boolean
1423 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1424 struct elf_link_hash_entry *h)
1425 {
1426 struct elf_i386_link_hash_table *htab;
1427 asection *s;
1428
1429 /* If this is a function, put it in the procedure linkage table. We
1430 will fill in the contents of the procedure linkage table later,
1431 when we know the address of the .got section. */
1432 if (h->type == STT_FUNC
1433 || h->needs_plt)
1434 {
1435 if (h->plt.refcount <= 0
1436 || SYMBOL_CALLS_LOCAL (info, h)
1437 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1438 && h->root.type == bfd_link_hash_undefweak))
1439 {
1440 /* This case can occur if we saw a PLT32 reloc in an input
1441 file, but the symbol was never referred to by a dynamic
1442 object, or if all references were garbage collected. In
1443 such a case, we don't actually need to build a procedure
1444 linkage table, and we can just do a PC32 reloc instead. */
1445 h->plt.offset = (bfd_vma) -1;
1446 h->needs_plt = 0;
1447 }
1448
1449 return TRUE;
1450 }
1451 else
1452 /* It's possible that we incorrectly decided a .plt reloc was
1453 needed for an R_386_PC32 reloc to a non-function sym in
1454 check_relocs. We can't decide accurately between function and
1455 non-function syms in check-relocs; Objects loaded later in
1456 the link may change h->type. So fix it now. */
1457 h->plt.offset = (bfd_vma) -1;
1458
1459 /* If this is a weak symbol, and there is a real definition, the
1460 processor independent code will have arranged for us to see the
1461 real definition first, and we can just use the same value. */
1462 if (h->u.weakdef != NULL)
1463 {
1464 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1465 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1466 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1467 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1468 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1469 h->non_got_ref = h->u.weakdef->non_got_ref;
1470 return TRUE;
1471 }
1472
1473 /* This is a reference to a symbol defined by a dynamic object which
1474 is not a function. */
1475
1476 /* If we are creating a shared library, we must presume that the
1477 only references to the symbol are via the global offset table.
1478 For such cases we need not do anything here; the relocations will
1479 be handled correctly by relocate_section. */
1480 if (info->shared)
1481 return TRUE;
1482
1483 /* If there are no references to this symbol that do not use the
1484 GOT, we don't need to generate a copy reloc. */
1485 if (!h->non_got_ref)
1486 return TRUE;
1487
1488 /* If -z nocopyreloc was given, we won't generate them either. */
1489 if (info->nocopyreloc)
1490 {
1491 h->non_got_ref = 0;
1492 return TRUE;
1493 }
1494
1495 htab = elf_i386_hash_table (info);
1496
1497 /* If there aren't any dynamic relocs in read-only sections, then
1498 we can keep the dynamic relocs and avoid the copy reloc. This
1499 doesn't work on VxWorks, where we can not have dynamic relocations
1500 (other than copy and jump slot relocations) in an executable. */
1501 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1502 {
1503 struct elf_i386_link_hash_entry * eh;
1504 struct elf_i386_dyn_relocs *p;
1505
1506 eh = (struct elf_i386_link_hash_entry *) h;
1507 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1508 {
1509 s = p->sec->output_section;
1510 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1511 break;
1512 }
1513
1514 if (p == NULL)
1515 {
1516 h->non_got_ref = 0;
1517 return TRUE;
1518 }
1519 }
1520
1521 if (h->size == 0)
1522 {
1523 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1524 h->root.root.string);
1525 return TRUE;
1526 }
1527
1528 /* We must allocate the symbol in our .dynbss section, which will
1529 become part of the .bss section of the executable. There will be
1530 an entry for this symbol in the .dynsym section. The dynamic
1531 object will contain position independent code, so all references
1532 from the dynamic object to this symbol will go through the global
1533 offset table. The dynamic linker will use the .dynsym entry to
1534 determine the address it must put in the global offset table, so
1535 both the dynamic object and the regular object will refer to the
1536 same memory location for the variable. */
1537
1538 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1539 copy the initial value out of the dynamic object and into the
1540 runtime process image. */
1541 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1542 {
1543 htab->srelbss->size += sizeof (Elf32_External_Rel);
1544 h->needs_copy = 1;
1545 }
1546
1547 s = htab->sdynbss;
1548
1549 return _bfd_elf_adjust_dynamic_copy (h, s);
1550 }
1551
1552 /* Allocate space in .plt, .got and associated reloc sections for
1553 dynamic relocs. */
1554
1555 static bfd_boolean
1556 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1557 {
1558 struct bfd_link_info *info;
1559 struct elf_i386_link_hash_table *htab;
1560 struct elf_i386_link_hash_entry *eh;
1561 struct elf_i386_dyn_relocs *p;
1562
1563 if (h->root.type == bfd_link_hash_indirect)
1564 return TRUE;
1565
1566 if (h->root.type == bfd_link_hash_warning)
1567 /* When warning symbols are created, they **replace** the "real"
1568 entry in the hash table, thus we never get to see the real
1569 symbol in a hash traversal. So look at it now. */
1570 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1571
1572 info = (struct bfd_link_info *) inf;
1573 htab = elf_i386_hash_table (info);
1574
1575 if (htab->elf.dynamic_sections_created
1576 && h->plt.refcount > 0)
1577 {
1578 /* Make sure this symbol is output as a dynamic symbol.
1579 Undefined weak syms won't yet be marked as dynamic. */
1580 if (h->dynindx == -1
1581 && !h->forced_local)
1582 {
1583 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1584 return FALSE;
1585 }
1586
1587 if (info->shared
1588 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1589 {
1590 asection *s = htab->splt;
1591
1592 /* If this is the first .plt entry, make room for the special
1593 first entry. */
1594 if (s->size == 0)
1595 s->size += PLT_ENTRY_SIZE;
1596
1597 h->plt.offset = s->size;
1598
1599 /* If this symbol is not defined in a regular file, and we are
1600 not generating a shared library, then set the symbol to this
1601 location in the .plt. This is required to make function
1602 pointers compare as equal between the normal executable and
1603 the shared library. */
1604 if (! info->shared
1605 && !h->def_regular)
1606 {
1607 h->root.u.def.section = s;
1608 h->root.u.def.value = h->plt.offset;
1609 }
1610
1611 /* Make room for this entry. */
1612 s->size += PLT_ENTRY_SIZE;
1613
1614 /* We also need to make an entry in the .got.plt section, which
1615 will be placed in the .got section by the linker script. */
1616 htab->sgotplt->size += 4;
1617
1618 /* We also need to make an entry in the .rel.plt section. */
1619 htab->srelplt->size += sizeof (Elf32_External_Rel);
1620 htab->next_tls_desc_index++;
1621
1622 if (htab->is_vxworks && !info->shared)
1623 {
1624 /* VxWorks has a second set of relocations for each PLT entry
1625 in executables. They go in a separate relocation section,
1626 which is processed by the kernel loader. */
1627
1628 /* There are two relocations for the initial PLT entry: an
1629 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1630 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1631
1632 if (h->plt.offset == PLT_ENTRY_SIZE)
1633 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1634
1635 /* There are two extra relocations for each subsequent PLT entry:
1636 an R_386_32 relocation for the GOT entry, and an R_386_32
1637 relocation for the PLT entry. */
1638
1639 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1640 }
1641 }
1642 else
1643 {
1644 h->plt.offset = (bfd_vma) -1;
1645 h->needs_plt = 0;
1646 }
1647 }
1648 else
1649 {
1650 h->plt.offset = (bfd_vma) -1;
1651 h->needs_plt = 0;
1652 }
1653
1654 eh = (struct elf_i386_link_hash_entry *) h;
1655 eh->tlsdesc_got = (bfd_vma) -1;
1656
1657 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1658 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1659 if (h->got.refcount > 0
1660 && !info->shared
1661 && h->dynindx == -1
1662 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1663 h->got.offset = (bfd_vma) -1;
1664 else if (h->got.refcount > 0)
1665 {
1666 asection *s;
1667 bfd_boolean dyn;
1668 int tls_type = elf_i386_hash_entry(h)->tls_type;
1669
1670 /* Make sure this symbol is output as a dynamic symbol.
1671 Undefined weak syms won't yet be marked as dynamic. */
1672 if (h->dynindx == -1
1673 && !h->forced_local)
1674 {
1675 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1676 return FALSE;
1677 }
1678
1679 s = htab->sgot;
1680 if (GOT_TLS_GDESC_P (tls_type))
1681 {
1682 eh->tlsdesc_got = htab->sgotplt->size
1683 - elf_i386_compute_jump_table_size (htab);
1684 htab->sgotplt->size += 8;
1685 h->got.offset = (bfd_vma) -2;
1686 }
1687 if (! GOT_TLS_GDESC_P (tls_type)
1688 || GOT_TLS_GD_P (tls_type))
1689 {
1690 h->got.offset = s->size;
1691 s->size += 4;
1692 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1693 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
1694 s->size += 4;
1695 }
1696 dyn = htab->elf.dynamic_sections_created;
1697 /* R_386_TLS_IE_32 needs one dynamic relocation,
1698 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1699 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1700 need two), R_386_TLS_GD needs one if local symbol and two if
1701 global. */
1702 if (tls_type == GOT_TLS_IE_BOTH)
1703 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1704 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1705 || (tls_type & GOT_TLS_IE))
1706 htab->srelgot->size += sizeof (Elf32_External_Rel);
1707 else if (GOT_TLS_GD_P (tls_type))
1708 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1709 else if (! GOT_TLS_GDESC_P (tls_type)
1710 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1711 || h->root.type != bfd_link_hash_undefweak)
1712 && (info->shared
1713 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1714 htab->srelgot->size += sizeof (Elf32_External_Rel);
1715 if (GOT_TLS_GDESC_P (tls_type))
1716 htab->srelplt->size += sizeof (Elf32_External_Rel);
1717 }
1718 else
1719 h->got.offset = (bfd_vma) -1;
1720
1721 if (eh->dyn_relocs == NULL)
1722 return TRUE;
1723
1724 /* In the shared -Bsymbolic case, discard space allocated for
1725 dynamic pc-relative relocs against symbols which turn out to be
1726 defined in regular objects. For the normal shared case, discard
1727 space for pc-relative relocs that have become local due to symbol
1728 visibility changes. */
1729
1730 if (info->shared)
1731 {
1732 /* The only reloc that uses pc_count is R_386_PC32, which will
1733 appear on a call or on something like ".long foo - .". We
1734 want calls to protected symbols to resolve directly to the
1735 function rather than going via the plt. If people want
1736 function pointer comparisons to work as expected then they
1737 should avoid writing assembly like ".long foo - .". */
1738 if (SYMBOL_CALLS_LOCAL (info, h))
1739 {
1740 struct elf_i386_dyn_relocs **pp;
1741
1742 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1743 {
1744 p->count -= p->pc_count;
1745 p->pc_count = 0;
1746 if (p->count == 0)
1747 *pp = p->next;
1748 else
1749 pp = &p->next;
1750 }
1751 }
1752
1753 /* Also discard relocs on undefined weak syms with non-default
1754 visibility. */
1755 if (eh->dyn_relocs != NULL
1756 && h->root.type == bfd_link_hash_undefweak)
1757 {
1758 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1759 eh->dyn_relocs = NULL;
1760
1761 /* Make sure undefined weak symbols are output as a dynamic
1762 symbol in PIEs. */
1763 else if (h->dynindx == -1
1764 && !h->forced_local)
1765 {
1766 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1767 return FALSE;
1768 }
1769 }
1770 }
1771 else if (ELIMINATE_COPY_RELOCS)
1772 {
1773 /* For the non-shared case, discard space for relocs against
1774 symbols which turn out to need copy relocs or are not
1775 dynamic. */
1776
1777 if (!h->non_got_ref
1778 && ((h->def_dynamic
1779 && !h->def_regular)
1780 || (htab->elf.dynamic_sections_created
1781 && (h->root.type == bfd_link_hash_undefweak
1782 || h->root.type == bfd_link_hash_undefined))))
1783 {
1784 /* Make sure this symbol is output as a dynamic symbol.
1785 Undefined weak syms won't yet be marked as dynamic. */
1786 if (h->dynindx == -1
1787 && !h->forced_local)
1788 {
1789 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1790 return FALSE;
1791 }
1792
1793 /* If that succeeded, we know we'll be keeping all the
1794 relocs. */
1795 if (h->dynindx != -1)
1796 goto keep;
1797 }
1798
1799 eh->dyn_relocs = NULL;
1800
1801 keep: ;
1802 }
1803
1804 /* Finally, allocate space. */
1805 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1806 {
1807 asection *sreloc = elf_section_data (p->sec)->sreloc;
1808 sreloc->size += p->count * sizeof (Elf32_External_Rel);
1809 }
1810
1811 return TRUE;
1812 }
1813
1814 /* Find any dynamic relocs that apply to read-only sections. */
1815
1816 static bfd_boolean
1817 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1818 {
1819 struct elf_i386_link_hash_entry *eh;
1820 struct elf_i386_dyn_relocs *p;
1821
1822 if (h->root.type == bfd_link_hash_warning)
1823 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1824
1825 eh = (struct elf_i386_link_hash_entry *) h;
1826 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1827 {
1828 asection *s = p->sec->output_section;
1829
1830 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1831 {
1832 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1833
1834 info->flags |= DF_TEXTREL;
1835
1836 /* Not an error, just cut short the traversal. */
1837 return FALSE;
1838 }
1839 }
1840 return TRUE;
1841 }
1842
1843 /* Set the sizes of the dynamic sections. */
1844
1845 static bfd_boolean
1846 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1847 struct bfd_link_info *info)
1848 {
1849 struct elf_i386_link_hash_table *htab;
1850 bfd *dynobj;
1851 asection *s;
1852 bfd_boolean relocs;
1853 bfd *ibfd;
1854
1855 htab = elf_i386_hash_table (info);
1856 dynobj = htab->elf.dynobj;
1857 if (dynobj == NULL)
1858 abort ();
1859
1860 if (htab->elf.dynamic_sections_created)
1861 {
1862 /* Set the contents of the .interp section to the interpreter. */
1863 if (info->executable)
1864 {
1865 s = bfd_get_section_by_name (dynobj, ".interp");
1866 if (s == NULL)
1867 abort ();
1868 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1869 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1870 }
1871 }
1872
1873 /* Set up .got offsets for local syms, and space for local dynamic
1874 relocs. */
1875 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1876 {
1877 bfd_signed_vma *local_got;
1878 bfd_signed_vma *end_local_got;
1879 char *local_tls_type;
1880 bfd_vma *local_tlsdesc_gotent;
1881 bfd_size_type locsymcount;
1882 Elf_Internal_Shdr *symtab_hdr;
1883 asection *srel;
1884
1885 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1886 continue;
1887
1888 for (s = ibfd->sections; s != NULL; s = s->next)
1889 {
1890 struct elf_i386_dyn_relocs *p;
1891
1892 for (p = ((struct elf_i386_dyn_relocs *)
1893 elf_section_data (s)->local_dynrel);
1894 p != NULL;
1895 p = p->next)
1896 {
1897 if (!bfd_is_abs_section (p->sec)
1898 && bfd_is_abs_section (p->sec->output_section))
1899 {
1900 /* Input section has been discarded, either because
1901 it is a copy of a linkonce section or due to
1902 linker script /DISCARD/, so we'll be discarding
1903 the relocs too. */
1904 }
1905 else if (p->count != 0)
1906 {
1907 srel = elf_section_data (p->sec)->sreloc;
1908 srel->size += p->count * sizeof (Elf32_External_Rel);
1909 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1910 info->flags |= DF_TEXTREL;
1911 }
1912 }
1913 }
1914
1915 local_got = elf_local_got_refcounts (ibfd);
1916 if (!local_got)
1917 continue;
1918
1919 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1920 locsymcount = symtab_hdr->sh_info;
1921 end_local_got = local_got + locsymcount;
1922 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1923 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
1924 s = htab->sgot;
1925 srel = htab->srelgot;
1926 for (; local_got < end_local_got;
1927 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
1928 {
1929 *local_tlsdesc_gotent = (bfd_vma) -1;
1930 if (*local_got > 0)
1931 {
1932 if (GOT_TLS_GDESC_P (*local_tls_type))
1933 {
1934 *local_tlsdesc_gotent = htab->sgotplt->size
1935 - elf_i386_compute_jump_table_size (htab);
1936 htab->sgotplt->size += 8;
1937 *local_got = (bfd_vma) -2;
1938 }
1939 if (! GOT_TLS_GDESC_P (*local_tls_type)
1940 || GOT_TLS_GD_P (*local_tls_type))
1941 {
1942 *local_got = s->size;
1943 s->size += 4;
1944 if (GOT_TLS_GD_P (*local_tls_type)
1945 || *local_tls_type == GOT_TLS_IE_BOTH)
1946 s->size += 4;
1947 }
1948 if (info->shared
1949 || GOT_TLS_GD_ANY_P (*local_tls_type)
1950 || (*local_tls_type & GOT_TLS_IE))
1951 {
1952 if (*local_tls_type == GOT_TLS_IE_BOTH)
1953 srel->size += 2 * sizeof (Elf32_External_Rel);
1954 else if (GOT_TLS_GD_P (*local_tls_type)
1955 || ! GOT_TLS_GDESC_P (*local_tls_type))
1956 srel->size += sizeof (Elf32_External_Rel);
1957 if (GOT_TLS_GDESC_P (*local_tls_type))
1958 htab->srelplt->size += sizeof (Elf32_External_Rel);
1959 }
1960 }
1961 else
1962 *local_got = (bfd_vma) -1;
1963 }
1964 }
1965
1966 if (htab->tls_ldm_got.refcount > 0)
1967 {
1968 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1969 relocs. */
1970 htab->tls_ldm_got.offset = htab->sgot->size;
1971 htab->sgot->size += 8;
1972 htab->srelgot->size += sizeof (Elf32_External_Rel);
1973 }
1974 else
1975 htab->tls_ldm_got.offset = -1;
1976
1977 /* Allocate global sym .plt and .got entries, and space for global
1978 sym dynamic relocs. */
1979 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1980
1981 /* For every jump slot reserved in the sgotplt, reloc_count is
1982 incremented. However, when we reserve space for TLS descriptors,
1983 it's not incremented, so in order to compute the space reserved
1984 for them, it suffices to multiply the reloc count by the jump
1985 slot size. */
1986 if (htab->srelplt)
1987 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
1988
1989 /* We now have determined the sizes of the various dynamic sections.
1990 Allocate memory for them. */
1991 relocs = FALSE;
1992 for (s = dynobj->sections; s != NULL; s = s->next)
1993 {
1994 bfd_boolean strip_section = TRUE;
1995
1996 if ((s->flags & SEC_LINKER_CREATED) == 0)
1997 continue;
1998
1999 if (s == htab->splt
2000 || s == htab->sgot
2001 || s == htab->sgotplt
2002 || s == htab->sdynbss)
2003 {
2004 /* Strip this section if we don't need it; see the
2005 comment below. */
2006 /* We'd like to strip these sections if they aren't needed, but if
2007 we've exported dynamic symbols from them we must leave them.
2008 It's too late to tell BFD to get rid of the symbols. */
2009
2010 if (htab->elf.hplt != NULL)
2011 strip_section = FALSE;
2012 }
2013 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2014 {
2015 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
2016 relocs = TRUE;
2017
2018 /* We use the reloc_count field as a counter if we need
2019 to copy relocs into the output file. */
2020 s->reloc_count = 0;
2021 }
2022 else
2023 {
2024 /* It's not one of our sections, so don't allocate space. */
2025 continue;
2026 }
2027
2028 if (s->size == 0)
2029 {
2030 /* If we don't need this section, strip it from the
2031 output file. This is mostly to handle .rel.bss and
2032 .rel.plt. We must create both sections in
2033 create_dynamic_sections, because they must be created
2034 before the linker maps input sections to output
2035 sections. The linker does that before
2036 adjust_dynamic_symbol is called, and it is that
2037 function which decides whether anything needs to go
2038 into these sections. */
2039 if (strip_section)
2040 s->flags |= SEC_EXCLUDE;
2041 continue;
2042 }
2043
2044 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2045 continue;
2046
2047 /* Allocate memory for the section contents. We use bfd_zalloc
2048 here in case unused entries are not reclaimed before the
2049 section's contents are written out. This should not happen,
2050 but this way if it does, we get a R_386_NONE reloc instead
2051 of garbage. */
2052 s->contents = bfd_zalloc (dynobj, s->size);
2053 if (s->contents == NULL)
2054 return FALSE;
2055 }
2056
2057 if (htab->elf.dynamic_sections_created)
2058 {
2059 /* Add some entries to the .dynamic section. We fill in the
2060 values later, in elf_i386_finish_dynamic_sections, but we
2061 must add the entries now so that we get the correct size for
2062 the .dynamic section. The DT_DEBUG entry is filled in by the
2063 dynamic linker and used by the debugger. */
2064 #define add_dynamic_entry(TAG, VAL) \
2065 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2066
2067 if (info->executable)
2068 {
2069 if (!add_dynamic_entry (DT_DEBUG, 0))
2070 return FALSE;
2071 }
2072
2073 if (htab->splt->size != 0)
2074 {
2075 if (!add_dynamic_entry (DT_PLTGOT, 0)
2076 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2077 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2078 || !add_dynamic_entry (DT_JMPREL, 0))
2079 return FALSE;
2080 }
2081
2082 if (relocs)
2083 {
2084 if (!add_dynamic_entry (DT_REL, 0)
2085 || !add_dynamic_entry (DT_RELSZ, 0)
2086 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2087 return FALSE;
2088
2089 /* If any dynamic relocs apply to a read-only section,
2090 then we need a DT_TEXTREL entry. */
2091 if ((info->flags & DF_TEXTREL) == 0)
2092 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2093 (PTR) info);
2094
2095 if ((info->flags & DF_TEXTREL) != 0)
2096 {
2097 if (!add_dynamic_entry (DT_TEXTREL, 0))
2098 return FALSE;
2099 }
2100 }
2101 }
2102 #undef add_dynamic_entry
2103
2104 return TRUE;
2105 }
2106
2107 static bfd_boolean
2108 elf_i386_always_size_sections (bfd *output_bfd,
2109 struct bfd_link_info *info)
2110 {
2111 asection *tls_sec = elf_hash_table (info)->tls_sec;
2112
2113 if (tls_sec)
2114 {
2115 struct elf_link_hash_entry *tlsbase;
2116
2117 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2118 "_TLS_MODULE_BASE_",
2119 FALSE, FALSE, FALSE);
2120
2121 if (tlsbase && tlsbase->type == STT_TLS)
2122 {
2123 struct bfd_link_hash_entry *bh = NULL;
2124 const struct elf_backend_data *bed
2125 = get_elf_backend_data (output_bfd);
2126
2127 if (!(_bfd_generic_link_add_one_symbol
2128 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2129 tls_sec, 0, NULL, FALSE,
2130 bed->collect, &bh)))
2131 return FALSE;
2132 tlsbase = (struct elf_link_hash_entry *)bh;
2133 tlsbase->def_regular = 1;
2134 tlsbase->other = STV_HIDDEN;
2135 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2136 }
2137 }
2138
2139 return TRUE;
2140 }
2141
2142 /* Set the correct type for an x86 ELF section. We do this by the
2143 section name, which is a hack, but ought to work. */
2144
2145 static bfd_boolean
2146 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2147 Elf_Internal_Shdr *hdr,
2148 asection *sec)
2149 {
2150 register const char *name;
2151
2152 name = bfd_get_section_name (abfd, sec);
2153
2154 /* This is an ugly, but unfortunately necessary hack that is
2155 needed when producing EFI binaries on x86. It tells
2156 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2157 containing ELF relocation info. We need this hack in order to
2158 be able to generate ELF binaries that can be translated into
2159 EFI applications (which are essentially COFF objects). Those
2160 files contain a COFF ".reloc" section inside an ELFNN object,
2161 which would normally cause BFD to segfault because it would
2162 attempt to interpret this section as containing relocation
2163 entries for section "oc". With this hack enabled, ".reloc"
2164 will be treated as a normal data section, which will avoid the
2165 segfault. However, you won't be able to create an ELFNN binary
2166 with a section named "oc" that needs relocations, but that's
2167 the kind of ugly side-effects you get when detecting section
2168 types based on their names... In practice, this limitation is
2169 unlikely to bite. */
2170 if (strcmp (name, ".reloc") == 0)
2171 hdr->sh_type = SHT_PROGBITS;
2172
2173 return TRUE;
2174 }
2175
2176 /* Return the base VMA address which should be subtracted from real addresses
2177 when resolving @dtpoff relocation.
2178 This is PT_TLS segment p_vaddr. */
2179
2180 static bfd_vma
2181 dtpoff_base (struct bfd_link_info *info)
2182 {
2183 /* If tls_sec is NULL, we should have signalled an error already. */
2184 if (elf_hash_table (info)->tls_sec == NULL)
2185 return 0;
2186 return elf_hash_table (info)->tls_sec->vma;
2187 }
2188
2189 /* Return the relocation value for @tpoff relocation
2190 if STT_TLS virtual address is ADDRESS. */
2191
2192 static bfd_vma
2193 tpoff (struct bfd_link_info *info, bfd_vma address)
2194 {
2195 struct elf_link_hash_table *htab = elf_hash_table (info);
2196
2197 /* If tls_sec is NULL, we should have signalled an error already. */
2198 if (htab->tls_sec == NULL)
2199 return 0;
2200 return htab->tls_size + htab->tls_sec->vma - address;
2201 }
2202
2203 /* Relocate an i386 ELF section. */
2204
2205 static bfd_boolean
2206 elf_i386_relocate_section (bfd *output_bfd,
2207 struct bfd_link_info *info,
2208 bfd *input_bfd,
2209 asection *input_section,
2210 bfd_byte *contents,
2211 Elf_Internal_Rela *relocs,
2212 Elf_Internal_Sym *local_syms,
2213 asection **local_sections)
2214 {
2215 struct elf_i386_link_hash_table *htab;
2216 Elf_Internal_Shdr *symtab_hdr;
2217 struct elf_link_hash_entry **sym_hashes;
2218 bfd_vma *local_got_offsets;
2219 bfd_vma *local_tlsdesc_gotents;
2220 Elf_Internal_Rela *rel;
2221 Elf_Internal_Rela *relend;
2222
2223 htab = elf_i386_hash_table (info);
2224 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2225 sym_hashes = elf_sym_hashes (input_bfd);
2226 local_got_offsets = elf_local_got_offsets (input_bfd);
2227 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2228
2229 rel = relocs;
2230 relend = relocs + input_section->reloc_count;
2231 for (; rel < relend; rel++)
2232 {
2233 unsigned int r_type;
2234 reloc_howto_type *howto;
2235 unsigned long r_symndx;
2236 struct elf_link_hash_entry *h;
2237 Elf_Internal_Sym *sym;
2238 asection *sec;
2239 bfd_vma off, offplt;
2240 bfd_vma relocation;
2241 bfd_boolean unresolved_reloc;
2242 bfd_reloc_status_type r;
2243 unsigned int indx;
2244 int tls_type;
2245
2246 r_type = ELF32_R_TYPE (rel->r_info);
2247 if (r_type == R_386_GNU_VTINHERIT
2248 || r_type == R_386_GNU_VTENTRY)
2249 continue;
2250
2251 if ((indx = r_type) >= R_386_standard
2252 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2253 >= R_386_ext - R_386_standard)
2254 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2255 >= R_386_tls - R_386_ext))
2256 {
2257 (*_bfd_error_handler)
2258 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2259 input_bfd, input_section, r_type);
2260 bfd_set_error (bfd_error_bad_value);
2261 return FALSE;
2262 }
2263 howto = elf_howto_table + indx;
2264
2265 r_symndx = ELF32_R_SYM (rel->r_info);
2266 h = NULL;
2267 sym = NULL;
2268 sec = NULL;
2269 unresolved_reloc = FALSE;
2270 if (r_symndx < symtab_hdr->sh_info)
2271 {
2272 sym = local_syms + r_symndx;
2273 sec = local_sections[r_symndx];
2274 relocation = (sec->output_section->vma
2275 + sec->output_offset
2276 + sym->st_value);
2277
2278 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2279 && ((sec->flags & SEC_MERGE) != 0
2280 || (info->relocatable
2281 && sec->output_offset != 0)))
2282 {
2283 bfd_vma addend;
2284 bfd_byte *where = contents + rel->r_offset;
2285
2286 switch (howto->size)
2287 {
2288 case 0:
2289 addend = bfd_get_8 (input_bfd, where);
2290 if (howto->pc_relative)
2291 {
2292 addend = (addend ^ 0x80) - 0x80;
2293 addend += 1;
2294 }
2295 break;
2296 case 1:
2297 addend = bfd_get_16 (input_bfd, where);
2298 if (howto->pc_relative)
2299 {
2300 addend = (addend ^ 0x8000) - 0x8000;
2301 addend += 2;
2302 }
2303 break;
2304 case 2:
2305 addend = bfd_get_32 (input_bfd, where);
2306 if (howto->pc_relative)
2307 {
2308 addend = (addend ^ 0x80000000) - 0x80000000;
2309 addend += 4;
2310 }
2311 break;
2312 default:
2313 abort ();
2314 }
2315
2316 if (info->relocatable)
2317 addend += sec->output_offset;
2318 else
2319 {
2320 asection *msec = sec;
2321 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2322 addend);
2323 addend -= relocation;
2324 addend += msec->output_section->vma + msec->output_offset;
2325 }
2326
2327 switch (howto->size)
2328 {
2329 case 0:
2330 /* FIXME: overflow checks. */
2331 if (howto->pc_relative)
2332 addend -= 1;
2333 bfd_put_8 (input_bfd, addend, where);
2334 break;
2335 case 1:
2336 if (howto->pc_relative)
2337 addend -= 2;
2338 bfd_put_16 (input_bfd, addend, where);
2339 break;
2340 case 2:
2341 if (howto->pc_relative)
2342 addend -= 4;
2343 bfd_put_32 (input_bfd, addend, where);
2344 break;
2345 }
2346 }
2347 }
2348 else
2349 {
2350 bfd_boolean warned;
2351
2352 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2353 r_symndx, symtab_hdr, sym_hashes,
2354 h, sec, relocation,
2355 unresolved_reloc, warned);
2356 }
2357
2358 if (sec != NULL && elf_discarded_section (sec))
2359 {
2360 /* For relocs against symbols from removed linkonce sections,
2361 or sections discarded by a linker script, we just want the
2362 section contents zeroed. Avoid any special processing. */
2363 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2364 rel->r_info = 0;
2365 rel->r_addend = 0;
2366 continue;
2367 }
2368
2369 if (info->relocatable)
2370 continue;
2371
2372 switch (r_type)
2373 {
2374 case R_386_GOT32:
2375 /* Relocation is to the entry for this symbol in the global
2376 offset table. */
2377 if (htab->sgot == NULL)
2378 abort ();
2379
2380 if (h != NULL)
2381 {
2382 bfd_boolean dyn;
2383
2384 off = h->got.offset;
2385 dyn = htab->elf.dynamic_sections_created;
2386 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2387 || (info->shared
2388 && SYMBOL_REFERENCES_LOCAL (info, h))
2389 || (ELF_ST_VISIBILITY (h->other)
2390 && h->root.type == bfd_link_hash_undefweak))
2391 {
2392 /* This is actually a static link, or it is a
2393 -Bsymbolic link and the symbol is defined
2394 locally, or the symbol was forced to be local
2395 because of a version file. We must initialize
2396 this entry in the global offset table. Since the
2397 offset must always be a multiple of 4, we use the
2398 least significant bit to record whether we have
2399 initialized it already.
2400
2401 When doing a dynamic link, we create a .rel.got
2402 relocation entry to initialize the value. This
2403 is done in the finish_dynamic_symbol routine. */
2404 if ((off & 1) != 0)
2405 off &= ~1;
2406 else
2407 {
2408 bfd_put_32 (output_bfd, relocation,
2409 htab->sgot->contents + off);
2410 h->got.offset |= 1;
2411 }
2412 }
2413 else
2414 unresolved_reloc = FALSE;
2415 }
2416 else
2417 {
2418 if (local_got_offsets == NULL)
2419 abort ();
2420
2421 off = local_got_offsets[r_symndx];
2422
2423 /* The offset must always be a multiple of 4. We use
2424 the least significant bit to record whether we have
2425 already generated the necessary reloc. */
2426 if ((off & 1) != 0)
2427 off &= ~1;
2428 else
2429 {
2430 bfd_put_32 (output_bfd, relocation,
2431 htab->sgot->contents + off);
2432
2433 if (info->shared)
2434 {
2435 asection *s;
2436 Elf_Internal_Rela outrel;
2437 bfd_byte *loc;
2438
2439 s = htab->srelgot;
2440 if (s == NULL)
2441 abort ();
2442
2443 outrel.r_offset = (htab->sgot->output_section->vma
2444 + htab->sgot->output_offset
2445 + off);
2446 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2447 loc = s->contents;
2448 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2449 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2450 }
2451
2452 local_got_offsets[r_symndx] |= 1;
2453 }
2454 }
2455
2456 if (off >= (bfd_vma) -2)
2457 abort ();
2458
2459 relocation = htab->sgot->output_section->vma
2460 + htab->sgot->output_offset + off
2461 - htab->sgotplt->output_section->vma
2462 - htab->sgotplt->output_offset;
2463 break;
2464
2465 case R_386_GOTOFF:
2466 /* Relocation is relative to the start of the global offset
2467 table. */
2468
2469 /* Check to make sure it isn't a protected function symbol
2470 for shared library since it may not be local when used
2471 as function address. */
2472 if (info->shared
2473 && !info->executable
2474 && h
2475 && h->def_regular
2476 && h->type == STT_FUNC
2477 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2478 {
2479 (*_bfd_error_handler)
2480 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2481 input_bfd, h->root.root.string);
2482 bfd_set_error (bfd_error_bad_value);
2483 return FALSE;
2484 }
2485
2486 /* Note that sgot is not involved in this
2487 calculation. We always want the start of .got.plt. If we
2488 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2489 permitted by the ABI, we might have to change this
2490 calculation. */
2491 relocation -= htab->sgotplt->output_section->vma
2492 + htab->sgotplt->output_offset;
2493 break;
2494
2495 case R_386_GOTPC:
2496 /* Use global offset table as symbol value. */
2497 relocation = htab->sgotplt->output_section->vma
2498 + htab->sgotplt->output_offset;
2499 unresolved_reloc = FALSE;
2500 break;
2501
2502 case R_386_PLT32:
2503 /* Relocation is to the entry for this symbol in the
2504 procedure linkage table. */
2505
2506 /* Resolve a PLT32 reloc against a local symbol directly,
2507 without using the procedure linkage table. */
2508 if (h == NULL)
2509 break;
2510
2511 if (h->plt.offset == (bfd_vma) -1
2512 || htab->splt == NULL)
2513 {
2514 /* We didn't make a PLT entry for this symbol. This
2515 happens when statically linking PIC code, or when
2516 using -Bsymbolic. */
2517 break;
2518 }
2519
2520 relocation = (htab->splt->output_section->vma
2521 + htab->splt->output_offset
2522 + h->plt.offset);
2523 unresolved_reloc = FALSE;
2524 break;
2525
2526 case R_386_32:
2527 case R_386_PC32:
2528 if ((input_section->flags & SEC_ALLOC) == 0)
2529 break;
2530
2531 if ((info->shared
2532 && (h == NULL
2533 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2534 || h->root.type != bfd_link_hash_undefweak)
2535 && (r_type != R_386_PC32
2536 || !SYMBOL_CALLS_LOCAL (info, h)))
2537 || (ELIMINATE_COPY_RELOCS
2538 && !info->shared
2539 && h != NULL
2540 && h->dynindx != -1
2541 && !h->non_got_ref
2542 && ((h->def_dynamic
2543 && !h->def_regular)
2544 || h->root.type == bfd_link_hash_undefweak
2545 || h->root.type == bfd_link_hash_undefined)))
2546 {
2547 Elf_Internal_Rela outrel;
2548 bfd_byte *loc;
2549 bfd_boolean skip, relocate;
2550 asection *sreloc;
2551
2552 /* When generating a shared object, these relocations
2553 are copied into the output file to be resolved at run
2554 time. */
2555
2556 skip = FALSE;
2557 relocate = FALSE;
2558
2559 outrel.r_offset =
2560 _bfd_elf_section_offset (output_bfd, info, input_section,
2561 rel->r_offset);
2562 if (outrel.r_offset == (bfd_vma) -1)
2563 skip = TRUE;
2564 else if (outrel.r_offset == (bfd_vma) -2)
2565 skip = TRUE, relocate = TRUE;
2566 outrel.r_offset += (input_section->output_section->vma
2567 + input_section->output_offset);
2568
2569 if (skip)
2570 memset (&outrel, 0, sizeof outrel);
2571 else if (h != NULL
2572 && h->dynindx != -1
2573 && (r_type == R_386_PC32
2574 || !info->shared
2575 || !SYMBOLIC_BIND (info, h)
2576 || !h->def_regular))
2577 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2578 else
2579 {
2580 /* This symbol is local, or marked to become local. */
2581 relocate = TRUE;
2582 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2583 }
2584
2585 sreloc = elf_section_data (input_section)->sreloc;
2586 if (sreloc == NULL)
2587 abort ();
2588
2589 loc = sreloc->contents;
2590 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2591 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2592
2593 /* If this reloc is against an external symbol, we do
2594 not want to fiddle with the addend. Otherwise, we
2595 need to include the symbol value so that it becomes
2596 an addend for the dynamic reloc. */
2597 if (! relocate)
2598 continue;
2599 }
2600 break;
2601
2602 case R_386_TLS_IE:
2603 if (info->shared)
2604 {
2605 Elf_Internal_Rela outrel;
2606 bfd_byte *loc;
2607 asection *sreloc;
2608
2609 outrel.r_offset = rel->r_offset
2610 + input_section->output_section->vma
2611 + input_section->output_offset;
2612 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2613 sreloc = elf_section_data (input_section)->sreloc;
2614 if (sreloc == NULL)
2615 abort ();
2616 loc = sreloc->contents;
2617 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2618 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2619 }
2620 /* Fall through */
2621
2622 case R_386_TLS_GD:
2623 case R_386_TLS_GOTDESC:
2624 case R_386_TLS_DESC_CALL:
2625 case R_386_TLS_IE_32:
2626 case R_386_TLS_GOTIE:
2627 r_type = elf_i386_tls_transition (info, r_type, h);
2628 tls_type = GOT_UNKNOWN;
2629 if (h == NULL && local_got_offsets)
2630 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2631 else if (h != NULL)
2632 {
2633 tls_type = elf_i386_hash_entry(h)->tls_type;
2634 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2635 r_type = R_386_TLS_LE_32;
2636 }
2637 if (tls_type == GOT_TLS_IE)
2638 tls_type = GOT_TLS_IE_NEG;
2639 if (r_type == R_386_TLS_GD
2640 || r_type == R_386_TLS_GOTDESC
2641 || r_type == R_386_TLS_DESC_CALL)
2642 {
2643 if (tls_type == GOT_TLS_IE_POS)
2644 r_type = R_386_TLS_GOTIE;
2645 else if (tls_type & GOT_TLS_IE)
2646 r_type = R_386_TLS_IE_32;
2647 }
2648
2649 if (r_type == R_386_TLS_LE_32)
2650 {
2651 BFD_ASSERT (! unresolved_reloc);
2652 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2653 {
2654 unsigned int val, type;
2655 bfd_vma roff;
2656 unsigned long tls_r_symndx;
2657 struct elf_link_hash_entry *tls_h;
2658
2659 /* GD->LE transition. */
2660 BFD_ASSERT (rel->r_offset >= 2);
2661 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2662 BFD_ASSERT (type == 0x8d || type == 0x04);
2663 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2664 BFD_ASSERT (bfd_get_8 (input_bfd,
2665 contents + rel->r_offset + 4)
2666 == 0xe8);
2667 BFD_ASSERT (rel + 1 < relend);
2668 tls_r_symndx = ELF32_R_SYM (rel[1].r_info);
2669 BFD_ASSERT (tls_r_symndx >= symtab_hdr->sh_info);
2670 tls_h = sym_hashes[tls_r_symndx - symtab_hdr->sh_info];
2671 BFD_ASSERT (tls_h != NULL
2672 && tls_h->root.root.string != NULL
2673 && strcmp (tls_h->root.root.string,
2674 "___tls_get_addr") == 0);
2675 BFD_ASSERT ((! info->shared
2676 && ELF32_R_TYPE (rel[1].r_info) == R_386_PC32)
2677 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2678 roff = rel->r_offset + 5;
2679 val = bfd_get_8 (input_bfd,
2680 contents + rel->r_offset - 1);
2681 if (type == 0x04)
2682 {
2683 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2684 Change it into:
2685 movl %gs:0, %eax; subl $foo@tpoff, %eax
2686 (6 byte form of subl). */
2687 BFD_ASSERT (rel->r_offset >= 3);
2688 BFD_ASSERT (bfd_get_8 (input_bfd,
2689 contents + rel->r_offset - 3)
2690 == 0x8d);
2691 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2692 memcpy (contents + rel->r_offset - 3,
2693 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2694 }
2695 else
2696 {
2697 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2698 if (rel->r_offset + 10 <= input_section->size
2699 && bfd_get_8 (input_bfd,
2700 contents + rel->r_offset + 9) == 0x90)
2701 {
2702 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2703 Change it into:
2704 movl %gs:0, %eax; subl $foo@tpoff, %eax
2705 (6 byte form of subl). */
2706 memcpy (contents + rel->r_offset - 2,
2707 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2708 roff = rel->r_offset + 6;
2709 }
2710 else
2711 {
2712 /* leal foo(%reg), %eax; call ___tls_get_addr
2713 Change it into:
2714 movl %gs:0, %eax; subl $foo@tpoff, %eax
2715 (5 byte form of subl). */
2716 memcpy (contents + rel->r_offset - 2,
2717 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2718 }
2719 }
2720 bfd_put_32 (output_bfd, tpoff (info, relocation),
2721 contents + roff);
2722 /* Skip R_386_PC32/R_386_PLT32. */
2723 rel++;
2724 continue;
2725 }
2726 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
2727 {
2728 /* GDesc -> LE transition.
2729 It's originally something like:
2730 leal x@tlsdesc(%ebx), %eax
2731
2732 leal x@ntpoff, %eax
2733
2734 Registers other than %eax may be set up here. */
2735
2736 unsigned int val, type;
2737 bfd_vma roff;
2738
2739 /* First, make sure it's a leal adding ebx to a
2740 32-bit offset into any register, although it's
2741 probably almost always going to be eax. */
2742 roff = rel->r_offset;
2743 BFD_ASSERT (roff >= 2);
2744 type = bfd_get_8 (input_bfd, contents + roff - 2);
2745 BFD_ASSERT (type == 0x8d);
2746 val = bfd_get_8 (input_bfd, contents + roff - 1);
2747 BFD_ASSERT ((val & 0xc7) == 0x83);
2748 BFD_ASSERT (roff + 4 <= input_section->size);
2749
2750 /* Now modify the instruction as appropriate. */
2751 /* aoliva FIXME: remove the above and xor the byte
2752 below with 0x86. */
2753 bfd_put_8 (output_bfd, val ^ 0x86,
2754 contents + roff - 1);
2755 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2756 contents + roff);
2757 continue;
2758 }
2759 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
2760 {
2761 /* GDesc -> LE transition.
2762 It's originally:
2763 call *(%eax)
2764 Turn it into:
2765 nop; nop */
2766
2767 unsigned int val, type;
2768 bfd_vma roff;
2769
2770 /* First, make sure it's a call *(%eax). */
2771 roff = rel->r_offset;
2772 BFD_ASSERT (roff + 2 <= input_section->size);
2773 type = bfd_get_8 (input_bfd, contents + roff);
2774 BFD_ASSERT (type == 0xff);
2775 val = bfd_get_8 (input_bfd, contents + roff + 1);
2776 BFD_ASSERT (val == 0x10);
2777
2778 /* Now modify the instruction as appropriate. Use
2779 xchg %ax,%ax instead of 2 nops. */
2780 bfd_put_8 (output_bfd, 0x66, contents + roff);
2781 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2782 continue;
2783 }
2784 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2785 {
2786 unsigned int val, type;
2787
2788 /* IE->LE transition:
2789 Originally it can be one of:
2790 movl foo, %eax
2791 movl foo, %reg
2792 addl foo, %reg
2793 We change it into:
2794 movl $foo, %eax
2795 movl $foo, %reg
2796 addl $foo, %reg. */
2797 BFD_ASSERT (rel->r_offset >= 1);
2798 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2799 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2800 if (val == 0xa1)
2801 {
2802 /* movl foo, %eax. */
2803 bfd_put_8 (output_bfd, 0xb8,
2804 contents + rel->r_offset - 1);
2805 }
2806 else
2807 {
2808 BFD_ASSERT (rel->r_offset >= 2);
2809 type = bfd_get_8 (input_bfd,
2810 contents + rel->r_offset - 2);
2811 switch (type)
2812 {
2813 case 0x8b:
2814 /* movl */
2815 BFD_ASSERT ((val & 0xc7) == 0x05);
2816 bfd_put_8 (output_bfd, 0xc7,
2817 contents + rel->r_offset - 2);
2818 bfd_put_8 (output_bfd,
2819 0xc0 | ((val >> 3) & 7),
2820 contents + rel->r_offset - 1);
2821 break;
2822 case 0x03:
2823 /* addl */
2824 BFD_ASSERT ((val & 0xc7) == 0x05);
2825 bfd_put_8 (output_bfd, 0x81,
2826 contents + rel->r_offset - 2);
2827 bfd_put_8 (output_bfd,
2828 0xc0 | ((val >> 3) & 7),
2829 contents + rel->r_offset - 1);
2830 break;
2831 default:
2832 BFD_FAIL ();
2833 break;
2834 }
2835 }
2836 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2837 contents + rel->r_offset);
2838 continue;
2839 }
2840 else
2841 {
2842 unsigned int val, type;
2843
2844 /* {IE_32,GOTIE}->LE transition:
2845 Originally it can be one of:
2846 subl foo(%reg1), %reg2
2847 movl foo(%reg1), %reg2
2848 addl foo(%reg1), %reg2
2849 We change it into:
2850 subl $foo, %reg2
2851 movl $foo, %reg2 (6 byte form)
2852 addl $foo, %reg2. */
2853 BFD_ASSERT (rel->r_offset >= 2);
2854 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2855 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2856 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2857 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2858 if (type == 0x8b)
2859 {
2860 /* movl */
2861 bfd_put_8 (output_bfd, 0xc7,
2862 contents + rel->r_offset - 2);
2863 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2864 contents + rel->r_offset - 1);
2865 }
2866 else if (type == 0x2b)
2867 {
2868 /* subl */
2869 bfd_put_8 (output_bfd, 0x81,
2870 contents + rel->r_offset - 2);
2871 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2872 contents + rel->r_offset - 1);
2873 }
2874 else if (type == 0x03)
2875 {
2876 /* addl */
2877 bfd_put_8 (output_bfd, 0x81,
2878 contents + rel->r_offset - 2);
2879 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2880 contents + rel->r_offset - 1);
2881 }
2882 else
2883 BFD_FAIL ();
2884 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2885 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2886 contents + rel->r_offset);
2887 else
2888 bfd_put_32 (output_bfd, tpoff (info, relocation),
2889 contents + rel->r_offset);
2890 continue;
2891 }
2892 }
2893
2894 if (htab->sgot == NULL)
2895 abort ();
2896
2897 if (h != NULL)
2898 {
2899 off = h->got.offset;
2900 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
2901 }
2902 else
2903 {
2904 if (local_got_offsets == NULL)
2905 abort ();
2906
2907 off = local_got_offsets[r_symndx];
2908 offplt = local_tlsdesc_gotents[r_symndx];
2909 }
2910
2911 if ((off & 1) != 0)
2912 off &= ~1;
2913 else
2914 {
2915 Elf_Internal_Rela outrel;
2916 bfd_byte *loc;
2917 int dr_type, indx;
2918 asection *sreloc;
2919
2920 if (htab->srelgot == NULL)
2921 abort ();
2922
2923 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2924
2925 if (GOT_TLS_GDESC_P (tls_type))
2926 {
2927 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
2928 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
2929 <= htab->sgotplt->size);
2930 outrel.r_offset = (htab->sgotplt->output_section->vma
2931 + htab->sgotplt->output_offset
2932 + offplt
2933 + htab->sgotplt_jump_table_size);
2934 sreloc = htab->srelplt;
2935 loc = sreloc->contents;
2936 loc += (htab->next_tls_desc_index++
2937 * sizeof (Elf32_External_Rel));
2938 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
2939 <= sreloc->contents + sreloc->size);
2940 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2941 if (indx == 0)
2942 {
2943 BFD_ASSERT (! unresolved_reloc);
2944 bfd_put_32 (output_bfd,
2945 relocation - dtpoff_base (info),
2946 htab->sgotplt->contents + offplt
2947 + htab->sgotplt_jump_table_size + 4);
2948 }
2949 else
2950 {
2951 bfd_put_32 (output_bfd, 0,
2952 htab->sgotplt->contents + offplt
2953 + htab->sgotplt_jump_table_size + 4);
2954 }
2955 }
2956
2957 sreloc = htab->srelgot;
2958
2959 outrel.r_offset = (htab->sgot->output_section->vma
2960 + htab->sgot->output_offset + off);
2961
2962 if (GOT_TLS_GD_P (tls_type))
2963 dr_type = R_386_TLS_DTPMOD32;
2964 else if (GOT_TLS_GDESC_P (tls_type))
2965 goto dr_done;
2966 else if (tls_type == GOT_TLS_IE_POS)
2967 dr_type = R_386_TLS_TPOFF;
2968 else
2969 dr_type = R_386_TLS_TPOFF32;
2970
2971 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2972 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2973 htab->sgot->contents + off);
2974 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2975 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2976 htab->sgot->contents + off);
2977 else if (dr_type != R_386_TLS_DESC)
2978 bfd_put_32 (output_bfd, 0,
2979 htab->sgot->contents + off);
2980 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2981
2982 loc = sreloc->contents;
2983 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2984 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
2985 <= sreloc->contents + sreloc->size);
2986 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2987
2988 if (GOT_TLS_GD_P (tls_type))
2989 {
2990 if (indx == 0)
2991 {
2992 BFD_ASSERT (! unresolved_reloc);
2993 bfd_put_32 (output_bfd,
2994 relocation - dtpoff_base (info),
2995 htab->sgot->contents + off + 4);
2996 }
2997 else
2998 {
2999 bfd_put_32 (output_bfd, 0,
3000 htab->sgot->contents + off + 4);
3001 outrel.r_info = ELF32_R_INFO (indx,
3002 R_386_TLS_DTPOFF32);
3003 outrel.r_offset += 4;
3004 sreloc->reloc_count++;
3005 loc += sizeof (Elf32_External_Rel);
3006 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3007 <= sreloc->contents + sreloc->size);
3008 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3009 }
3010 }
3011 else if (tls_type == GOT_TLS_IE_BOTH)
3012 {
3013 bfd_put_32 (output_bfd,
3014 indx == 0 ? relocation - dtpoff_base (info) : 0,
3015 htab->sgot->contents + off + 4);
3016 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3017 outrel.r_offset += 4;
3018 sreloc->reloc_count++;
3019 loc += sizeof (Elf32_External_Rel);
3020 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3021 }
3022
3023 dr_done:
3024 if (h != NULL)
3025 h->got.offset |= 1;
3026 else
3027 local_got_offsets[r_symndx] |= 1;
3028 }
3029
3030 if (off >= (bfd_vma) -2
3031 && ! GOT_TLS_GDESC_P (tls_type))
3032 abort ();
3033 if (r_type == R_386_TLS_GOTDESC
3034 || r_type == R_386_TLS_DESC_CALL)
3035 {
3036 relocation = htab->sgotplt_jump_table_size + offplt;
3037 unresolved_reloc = FALSE;
3038 }
3039 else if (r_type == ELF32_R_TYPE (rel->r_info))
3040 {
3041 bfd_vma g_o_t = htab->sgotplt->output_section->vma
3042 + htab->sgotplt->output_offset;
3043 relocation = htab->sgot->output_section->vma
3044 + htab->sgot->output_offset + off - g_o_t;
3045 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3046 && tls_type == GOT_TLS_IE_BOTH)
3047 relocation += 4;
3048 if (r_type == R_386_TLS_IE)
3049 relocation += g_o_t;
3050 unresolved_reloc = FALSE;
3051 }
3052 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3053 {
3054 unsigned int val, type;
3055 bfd_vma roff;
3056
3057 /* GD->IE transition. */
3058 BFD_ASSERT (rel->r_offset >= 2);
3059 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3060 BFD_ASSERT (type == 0x8d || type == 0x04);
3061 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
3062 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
3063 == 0xe8);
3064 BFD_ASSERT (rel + 1 < relend);
3065 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
3066 roff = rel->r_offset - 3;
3067 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3068 if (type == 0x04)
3069 {
3070 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3071 Change it into:
3072 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3073 BFD_ASSERT (rel->r_offset >= 3);
3074 BFD_ASSERT (bfd_get_8 (input_bfd,
3075 contents + rel->r_offset - 3)
3076 == 0x8d);
3077 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
3078 val >>= 3;
3079 }
3080 else
3081 {
3082 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3083 Change it into:
3084 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3085 BFD_ASSERT (rel->r_offset + 10 <= input_section->size);
3086 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
3087 BFD_ASSERT (bfd_get_8 (input_bfd,
3088 contents + rel->r_offset + 9)
3089 == 0x90);
3090 roff = rel->r_offset - 2;
3091 }
3092 memcpy (contents + roff,
3093 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3094 contents[roff + 7] = 0x80 | (val & 7);
3095 /* If foo is used only with foo@gotntpoff(%reg) and
3096 foo@indntpoff, but not with foo@gottpoff(%reg), change
3097 subl $foo@gottpoff(%reg), %eax
3098 into:
3099 addl $foo@gotntpoff(%reg), %eax. */
3100 if (tls_type == GOT_TLS_IE_POS)
3101 contents[roff + 6] = 0x03;
3102 bfd_put_32 (output_bfd,
3103 htab->sgot->output_section->vma
3104 + htab->sgot->output_offset + off
3105 - htab->sgotplt->output_section->vma
3106 - htab->sgotplt->output_offset,
3107 contents + roff + 8);
3108 /* Skip R_386_PLT32. */
3109 rel++;
3110 continue;
3111 }
3112 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3113 {
3114 /* GDesc -> IE transition.
3115 It's originally something like:
3116 leal x@tlsdesc(%ebx), %eax
3117
3118 Change it to:
3119 movl x@gotntpoff(%ebx), %eax # before nop; nop
3120 or:
3121 movl x@gottpoff(%ebx), %eax # before negl %eax
3122
3123 Registers other than %eax may be set up here. */
3124
3125 unsigned int val, type;
3126 bfd_vma roff;
3127
3128 /* First, make sure it's a leal adding ebx to a 32-bit
3129 offset into any register, although it's probably
3130 almost always going to be eax. */
3131 roff = rel->r_offset;
3132 BFD_ASSERT (roff >= 2);
3133 type = bfd_get_8 (input_bfd, contents + roff - 2);
3134 BFD_ASSERT (type == 0x8d);
3135 val = bfd_get_8 (input_bfd, contents + roff - 1);
3136 BFD_ASSERT ((val & 0xc7) == 0x83);
3137 BFD_ASSERT (roff + 4 <= input_section->size);
3138
3139 /* Now modify the instruction as appropriate. */
3140 /* To turn a leal into a movl in the form we use it, it
3141 suffices to change the first byte from 0x8d to 0x8b.
3142 aoliva FIXME: should we decide to keep the leal, all
3143 we have to do is remove the statement below, and
3144 adjust the relaxation of R_386_TLS_DESC_CALL. */
3145 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3146
3147 if (tls_type == GOT_TLS_IE_BOTH)
3148 off += 4;
3149
3150 bfd_put_32 (output_bfd,
3151 htab->sgot->output_section->vma
3152 + htab->sgot->output_offset + off
3153 - htab->sgotplt->output_section->vma
3154 - htab->sgotplt->output_offset,
3155 contents + roff);
3156 continue;
3157 }
3158 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3159 {
3160 /* GDesc -> IE transition.
3161 It's originally:
3162 call *(%eax)
3163
3164 Change it to:
3165 nop; nop
3166 or
3167 negl %eax
3168 depending on how we transformed the TLS_GOTDESC above.
3169 */
3170
3171 unsigned int val, type;
3172 bfd_vma roff;
3173
3174 /* First, make sure it's a call *(%eax). */
3175 roff = rel->r_offset;
3176 BFD_ASSERT (roff + 2 <= input_section->size);
3177 type = bfd_get_8 (input_bfd, contents + roff);
3178 BFD_ASSERT (type == 0xff);
3179 val = bfd_get_8 (input_bfd, contents + roff + 1);
3180 BFD_ASSERT (val == 0x10);
3181
3182 /* Now modify the instruction as appropriate. */
3183 if (tls_type != GOT_TLS_IE_NEG)
3184 {
3185 /* xchg %ax,%ax */
3186 bfd_put_8 (output_bfd, 0x66, contents + roff);
3187 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3188 }
3189 else
3190 {
3191 /* negl %eax */
3192 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3193 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3194 }
3195
3196 continue;
3197 }
3198 else
3199 BFD_ASSERT (FALSE);
3200 break;
3201
3202 case R_386_TLS_LDM:
3203 if (! info->shared)
3204 {
3205 unsigned int val;
3206 unsigned long tls_r_symndx;
3207 struct elf_link_hash_entry *tls_h;
3208
3209 /* LD->LE transition:
3210 Ensure it is:
3211 leal foo(%reg), %eax; call ___tls_get_addr.
3212 We change it into:
3213 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3214 BFD_ASSERT (rel->r_offset >= 2);
3215 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
3216 == 0x8d);
3217 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3218 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
3219 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
3220 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
3221 == 0xe8);
3222 BFD_ASSERT (rel + 1 < relend);
3223 tls_r_symndx = ELF32_R_SYM (rel[1].r_info);
3224 BFD_ASSERT (tls_r_symndx >= symtab_hdr->sh_info);
3225 tls_h = sym_hashes[tls_r_symndx - symtab_hdr->sh_info];
3226 BFD_ASSERT (tls_h != NULL
3227 && tls_h->root.root.string != NULL
3228 && strcmp (tls_h->root.root.string,
3229 "___tls_get_addr") == 0);
3230 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
3231 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
3232 memcpy (contents + rel->r_offset - 2,
3233 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3234 /* Skip R_386_PC32/R_386_PLT32. */
3235 rel++;
3236 continue;
3237 }
3238
3239 if (htab->sgot == NULL)
3240 abort ();
3241
3242 off = htab->tls_ldm_got.offset;
3243 if (off & 1)
3244 off &= ~1;
3245 else
3246 {
3247 Elf_Internal_Rela outrel;
3248 bfd_byte *loc;
3249
3250 if (htab->srelgot == NULL)
3251 abort ();
3252
3253 outrel.r_offset = (htab->sgot->output_section->vma
3254 + htab->sgot->output_offset + off);
3255
3256 bfd_put_32 (output_bfd, 0,
3257 htab->sgot->contents + off);
3258 bfd_put_32 (output_bfd, 0,
3259 htab->sgot->contents + off + 4);
3260 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3261 loc = htab->srelgot->contents;
3262 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3263 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3264 htab->tls_ldm_got.offset |= 1;
3265 }
3266 relocation = htab->sgot->output_section->vma
3267 + htab->sgot->output_offset + off
3268 - htab->sgotplt->output_section->vma
3269 - htab->sgotplt->output_offset;
3270 unresolved_reloc = FALSE;
3271 break;
3272
3273 case R_386_TLS_LDO_32:
3274 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3275 relocation -= dtpoff_base (info);
3276 else
3277 /* When converting LDO to LE, we must negate. */
3278 relocation = -tpoff (info, relocation);
3279 break;
3280
3281 case R_386_TLS_LE_32:
3282 case R_386_TLS_LE:
3283 if (info->shared)
3284 {
3285 Elf_Internal_Rela outrel;
3286 asection *sreloc;
3287 bfd_byte *loc;
3288 int indx;
3289
3290 outrel.r_offset = rel->r_offset
3291 + input_section->output_section->vma
3292 + input_section->output_offset;
3293 if (h != NULL && h->dynindx != -1)
3294 indx = h->dynindx;
3295 else
3296 indx = 0;
3297 if (r_type == R_386_TLS_LE_32)
3298 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3299 else
3300 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3301 sreloc = elf_section_data (input_section)->sreloc;
3302 if (sreloc == NULL)
3303 abort ();
3304 loc = sreloc->contents;
3305 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3306 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3307 if (indx)
3308 continue;
3309 else if (r_type == R_386_TLS_LE_32)
3310 relocation = dtpoff_base (info) - relocation;
3311 else
3312 relocation -= dtpoff_base (info);
3313 }
3314 else if (r_type == R_386_TLS_LE_32)
3315 relocation = tpoff (info, relocation);
3316 else
3317 relocation = -tpoff (info, relocation);
3318 break;
3319
3320 default:
3321 break;
3322 }
3323
3324 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3325 because such sections are not SEC_ALLOC and thus ld.so will
3326 not process them. */
3327 if (unresolved_reloc
3328 && !((input_section->flags & SEC_DEBUGGING) != 0
3329 && h->def_dynamic))
3330 {
3331 (*_bfd_error_handler)
3332 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3333 input_bfd,
3334 input_section,
3335 (long) rel->r_offset,
3336 howto->name,
3337 h->root.root.string);
3338 return FALSE;
3339 }
3340
3341 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3342 contents, rel->r_offset,
3343 relocation, 0);
3344
3345 if (r != bfd_reloc_ok)
3346 {
3347 const char *name;
3348
3349 if (h != NULL)
3350 name = h->root.root.string;
3351 else
3352 {
3353 name = bfd_elf_string_from_elf_section (input_bfd,
3354 symtab_hdr->sh_link,
3355 sym->st_name);
3356 if (name == NULL)
3357 return FALSE;
3358 if (*name == '\0')
3359 name = bfd_section_name (input_bfd, sec);
3360 }
3361
3362 if (r == bfd_reloc_overflow)
3363 {
3364 if (! ((*info->callbacks->reloc_overflow)
3365 (info, (h ? &h->root : NULL), name, howto->name,
3366 (bfd_vma) 0, input_bfd, input_section,
3367 rel->r_offset)))
3368 return FALSE;
3369 }
3370 else
3371 {
3372 (*_bfd_error_handler)
3373 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3374 input_bfd, input_section,
3375 (long) rel->r_offset, name, (int) r);
3376 return FALSE;
3377 }
3378 }
3379 }
3380
3381 return TRUE;
3382 }
3383
3384 /* Finish up dynamic symbol handling. We set the contents of various
3385 dynamic sections here. */
3386
3387 static bfd_boolean
3388 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3389 struct bfd_link_info *info,
3390 struct elf_link_hash_entry *h,
3391 Elf_Internal_Sym *sym)
3392 {
3393 struct elf_i386_link_hash_table *htab;
3394
3395 htab = elf_i386_hash_table (info);
3396
3397 if (h->plt.offset != (bfd_vma) -1)
3398 {
3399 bfd_vma plt_index;
3400 bfd_vma got_offset;
3401 Elf_Internal_Rela rel;
3402 bfd_byte *loc;
3403
3404 /* This symbol has an entry in the procedure linkage table. Set
3405 it up. */
3406
3407 if (h->dynindx == -1
3408 || htab->splt == NULL
3409 || htab->sgotplt == NULL
3410 || htab->srelplt == NULL)
3411 abort ();
3412
3413 /* Get the index in the procedure linkage table which
3414 corresponds to this symbol. This is the index of this symbol
3415 in all the symbols for which we are making plt entries. The
3416 first entry in the procedure linkage table is reserved. */
3417 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3418
3419 /* Get the offset into the .got table of the entry that
3420 corresponds to this function. Each .got entry is 4 bytes.
3421 The first three are reserved. */
3422 got_offset = (plt_index + 3) * 4;
3423
3424 /* Fill in the entry in the procedure linkage table. */
3425 if (! info->shared)
3426 {
3427 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3428 PLT_ENTRY_SIZE);
3429 bfd_put_32 (output_bfd,
3430 (htab->sgotplt->output_section->vma
3431 + htab->sgotplt->output_offset
3432 + got_offset),
3433 htab->splt->contents + h->plt.offset + 2);
3434
3435 if (htab->is_vxworks)
3436 {
3437 int s, k, reloc_index;
3438
3439 /* Create the R_386_32 relocation referencing the GOT
3440 for this PLT entry. */
3441
3442 /* S: Current slot number (zero-based). */
3443 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3444 /* K: Number of relocations for PLTResolve. */
3445 if (info->shared)
3446 k = PLTRESOLVE_RELOCS_SHLIB;
3447 else
3448 k = PLTRESOLVE_RELOCS;
3449 /* Skip the PLTresolve relocations, and the relocations for
3450 the other PLT slots. */
3451 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3452 loc = (htab->srelplt2->contents + reloc_index
3453 * sizeof (Elf32_External_Rel));
3454
3455 rel.r_offset = (htab->splt->output_section->vma
3456 + htab->splt->output_offset
3457 + h->plt.offset + 2),
3458 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3459 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3460
3461 /* Create the R_386_32 relocation referencing the beginning of
3462 the PLT for this GOT entry. */
3463 rel.r_offset = (htab->sgotplt->output_section->vma
3464 + htab->sgotplt->output_offset
3465 + got_offset);
3466 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3467 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3468 loc + sizeof (Elf32_External_Rel));
3469 }
3470 }
3471 else
3472 {
3473 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3474 PLT_ENTRY_SIZE);
3475 bfd_put_32 (output_bfd, got_offset,
3476 htab->splt->contents + h->plt.offset + 2);
3477 }
3478
3479 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3480 htab->splt->contents + h->plt.offset + 7);
3481 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3482 htab->splt->contents + h->plt.offset + 12);
3483
3484 /* Fill in the entry in the global offset table. */
3485 bfd_put_32 (output_bfd,
3486 (htab->splt->output_section->vma
3487 + htab->splt->output_offset
3488 + h->plt.offset
3489 + 6),
3490 htab->sgotplt->contents + got_offset);
3491
3492 /* Fill in the entry in the .rel.plt section. */
3493 rel.r_offset = (htab->sgotplt->output_section->vma
3494 + htab->sgotplt->output_offset
3495 + got_offset);
3496 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3497 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3498 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3499
3500 if (!h->def_regular)
3501 {
3502 /* Mark the symbol as undefined, rather than as defined in
3503 the .plt section. Leave the value if there were any
3504 relocations where pointer equality matters (this is a clue
3505 for the dynamic linker, to make function pointer
3506 comparisons work between an application and shared
3507 library), otherwise set it to zero. If a function is only
3508 called from a binary, there is no need to slow down
3509 shared libraries because of that. */
3510 sym->st_shndx = SHN_UNDEF;
3511 if (!h->pointer_equality_needed)
3512 sym->st_value = 0;
3513 }
3514 }
3515
3516 if (h->got.offset != (bfd_vma) -1
3517 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
3518 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3519 {
3520 Elf_Internal_Rela rel;
3521 bfd_byte *loc;
3522
3523 /* This symbol has an entry in the global offset table. Set it
3524 up. */
3525
3526 if (htab->sgot == NULL || htab->srelgot == NULL)
3527 abort ();
3528
3529 rel.r_offset = (htab->sgot->output_section->vma
3530 + htab->sgot->output_offset
3531 + (h->got.offset & ~(bfd_vma) 1));
3532
3533 /* If this is a static link, or it is a -Bsymbolic link and the
3534 symbol is defined locally or was forced to be local because
3535 of a version file, we just want to emit a RELATIVE reloc.
3536 The entry in the global offset table will already have been
3537 initialized in the relocate_section function. */
3538 if (info->shared
3539 && SYMBOL_REFERENCES_LOCAL (info, h))
3540 {
3541 BFD_ASSERT((h->got.offset & 1) != 0);
3542 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3543 }
3544 else
3545 {
3546 BFD_ASSERT((h->got.offset & 1) == 0);
3547 bfd_put_32 (output_bfd, (bfd_vma) 0,
3548 htab->sgot->contents + h->got.offset);
3549 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3550 }
3551
3552 loc = htab->srelgot->contents;
3553 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3554 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3555 }
3556
3557 if (h->needs_copy)
3558 {
3559 Elf_Internal_Rela rel;
3560 bfd_byte *loc;
3561
3562 /* This symbol needs a copy reloc. Set it up. */
3563
3564 if (h->dynindx == -1
3565 || (h->root.type != bfd_link_hash_defined
3566 && h->root.type != bfd_link_hash_defweak)
3567 || htab->srelbss == NULL)
3568 abort ();
3569
3570 rel.r_offset = (h->root.u.def.value
3571 + h->root.u.def.section->output_section->vma
3572 + h->root.u.def.section->output_offset);
3573 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3574 loc = htab->srelbss->contents;
3575 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3576 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3577 }
3578
3579 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3580 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3581 is relative to the ".got" section. */
3582 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3583 || (!htab->is_vxworks && h == htab->elf.hgot))
3584 sym->st_shndx = SHN_ABS;
3585
3586 return TRUE;
3587 }
3588
3589 /* Used to decide how to sort relocs in an optimal manner for the
3590 dynamic linker, before writing them out. */
3591
3592 static enum elf_reloc_type_class
3593 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3594 {
3595 switch (ELF32_R_TYPE (rela->r_info))
3596 {
3597 case R_386_RELATIVE:
3598 return reloc_class_relative;
3599 case R_386_JUMP_SLOT:
3600 return reloc_class_plt;
3601 case R_386_COPY:
3602 return reloc_class_copy;
3603 default:
3604 return reloc_class_normal;
3605 }
3606 }
3607
3608 /* Finish up the dynamic sections. */
3609
3610 static bfd_boolean
3611 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3612 struct bfd_link_info *info)
3613 {
3614 struct elf_i386_link_hash_table *htab;
3615 bfd *dynobj;
3616 asection *sdyn;
3617
3618 htab = elf_i386_hash_table (info);
3619 dynobj = htab->elf.dynobj;
3620 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3621
3622 if (htab->elf.dynamic_sections_created)
3623 {
3624 Elf32_External_Dyn *dyncon, *dynconend;
3625
3626 if (sdyn == NULL || htab->sgot == NULL)
3627 abort ();
3628
3629 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3630 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3631 for (; dyncon < dynconend; dyncon++)
3632 {
3633 Elf_Internal_Dyn dyn;
3634 asection *s;
3635
3636 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3637
3638 switch (dyn.d_tag)
3639 {
3640 default:
3641 continue;
3642
3643 case DT_PLTGOT:
3644 s = htab->sgotplt;
3645 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3646 break;
3647
3648 case DT_JMPREL:
3649 s = htab->srelplt;
3650 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3651 break;
3652
3653 case DT_PLTRELSZ:
3654 s = htab->srelplt;
3655 dyn.d_un.d_val = s->size;
3656 break;
3657
3658 case DT_RELSZ:
3659 /* My reading of the SVR4 ABI indicates that the
3660 procedure linkage table relocs (DT_JMPREL) should be
3661 included in the overall relocs (DT_REL). This is
3662 what Solaris does. However, UnixWare can not handle
3663 that case. Therefore, we override the DT_RELSZ entry
3664 here to make it not include the JMPREL relocs. */
3665 s = htab->srelplt;
3666 if (s == NULL)
3667 continue;
3668 dyn.d_un.d_val -= s->size;
3669 break;
3670
3671 case DT_REL:
3672 /* We may not be using the standard ELF linker script.
3673 If .rel.plt is the first .rel section, we adjust
3674 DT_REL to not include it. */
3675 s = htab->srelplt;
3676 if (s == NULL)
3677 continue;
3678 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3679 continue;
3680 dyn.d_un.d_ptr += s->size;
3681 break;
3682 }
3683
3684 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3685 }
3686
3687 /* Fill in the first entry in the procedure linkage table. */
3688 if (htab->splt && htab->splt->size > 0)
3689 {
3690 if (info->shared)
3691 {
3692 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3693 sizeof (elf_i386_pic_plt0_entry));
3694 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3695 htab->plt0_pad_byte,
3696 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3697 }
3698 else
3699 {
3700 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3701 sizeof(elf_i386_plt0_entry));
3702 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3703 htab->plt0_pad_byte,
3704 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3705 bfd_put_32 (output_bfd,
3706 (htab->sgotplt->output_section->vma
3707 + htab->sgotplt->output_offset
3708 + 4),
3709 htab->splt->contents + 2);
3710 bfd_put_32 (output_bfd,
3711 (htab->sgotplt->output_section->vma
3712 + htab->sgotplt->output_offset
3713 + 8),
3714 htab->splt->contents + 8);
3715
3716 if (htab->is_vxworks)
3717 {
3718 Elf_Internal_Rela rel;
3719
3720 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3721 On IA32 we use REL relocations so the addend goes in
3722 the PLT directly. */
3723 rel.r_offset = (htab->splt->output_section->vma
3724 + htab->splt->output_offset
3725 + 2);
3726 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3727 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3728 htab->srelplt2->contents);
3729 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3730 rel.r_offset = (htab->splt->output_section->vma
3731 + htab->splt->output_offset
3732 + 8);
3733 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3734 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3735 htab->srelplt2->contents +
3736 sizeof (Elf32_External_Rel));
3737 }
3738 }
3739
3740 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3741 really seem like the right value. */
3742 elf_section_data (htab->splt->output_section)
3743 ->this_hdr.sh_entsize = 4;
3744
3745 /* Correct the .rel.plt.unloaded relocations. */
3746 if (htab->is_vxworks && !info->shared)
3747 {
3748 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3749 unsigned char *p;
3750
3751 p = htab->srelplt2->contents;
3752 if (info->shared)
3753 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3754 else
3755 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3756
3757 for (; num_plts; num_plts--)
3758 {
3759 Elf_Internal_Rela rel;
3760 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3761 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3762 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3763 p += sizeof (Elf32_External_Rel);
3764
3765 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3766 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3767 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3768 p += sizeof (Elf32_External_Rel);
3769 }
3770 }
3771 }
3772 }
3773
3774 if (htab->sgotplt)
3775 {
3776 /* Fill in the first three entries in the global offset table. */
3777 if (htab->sgotplt->size > 0)
3778 {
3779 bfd_put_32 (output_bfd,
3780 (sdyn == NULL ? 0
3781 : sdyn->output_section->vma + sdyn->output_offset),
3782 htab->sgotplt->contents);
3783 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3784 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3785 }
3786
3787 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3788 }
3789
3790 if (htab->sgot && htab->sgot->size > 0)
3791 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3792
3793 return TRUE;
3794 }
3795
3796 /* Return address for Ith PLT stub in section PLT, for relocation REL
3797 or (bfd_vma) -1 if it should not be included. */
3798
3799 static bfd_vma
3800 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3801 const arelent *rel ATTRIBUTE_UNUSED)
3802 {
3803 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3804 }
3805
3806 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
3807
3808 static bfd_boolean
3809 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
3810 {
3811 if (h->plt.offset != (bfd_vma) -1
3812 && !h->def_regular
3813 && !h->pointer_equality_needed)
3814 return FALSE;
3815
3816 return _bfd_elf_hash_symbol (h);
3817 }
3818
3819 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3820 #define TARGET_LITTLE_NAME "elf32-i386"
3821 #define ELF_ARCH bfd_arch_i386
3822 #define ELF_MACHINE_CODE EM_386
3823 #define ELF_MAXPAGESIZE 0x1000
3824
3825 #define elf_backend_can_gc_sections 1
3826 #define elf_backend_can_refcount 1
3827 #define elf_backend_want_got_plt 1
3828 #define elf_backend_plt_readonly 1
3829 #define elf_backend_want_plt_sym 0
3830 #define elf_backend_got_header_size 12
3831
3832 /* Support RELA for objdump of prelink objects. */
3833 #define elf_info_to_howto elf_i386_info_to_howto_rel
3834 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3835
3836 #define bfd_elf32_mkobject elf_i386_mkobject
3837
3838 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3839 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3840 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3841 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
3842
3843 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3844 #define elf_backend_check_relocs elf_i386_check_relocs
3845 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3846 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3847 #define elf_backend_fake_sections elf_i386_fake_sections
3848 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3849 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3850 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3851 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3852 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3853 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3854 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3855 #define elf_backend_relocate_section elf_i386_relocate_section
3856 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3857 #define elf_backend_always_size_sections elf_i386_always_size_sections
3858 #define elf_backend_omit_section_dynsym \
3859 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
3860 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
3861 #define elf_backend_hash_symbol elf_i386_hash_symbol
3862
3863 #include "elf32-target.h"
3864
3865 /* FreeBSD support. */
3866
3867 #undef TARGET_LITTLE_SYM
3868 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3869 #undef TARGET_LITTLE_NAME
3870 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3871 #undef ELF_OSABI
3872 #define ELF_OSABI ELFOSABI_FREEBSD
3873
3874 /* The kernel recognizes executables as valid only if they carry a
3875 "FreeBSD" label in the ELF header. So we put this label on all
3876 executables and (for simplicity) also all other object files. */
3877
3878 static void
3879 elf_i386_post_process_headers (bfd *abfd,
3880 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3881 {
3882 Elf_Internal_Ehdr *i_ehdrp;
3883
3884 i_ehdrp = elf_elfheader (abfd);
3885
3886 /* Put an ABI label supported by FreeBSD >= 4.1. */
3887 i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi;
3888 #ifdef OLD_FREEBSD_ABI_LABEL
3889 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3890 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3891 #endif
3892 }
3893
3894 #undef elf_backend_post_process_headers
3895 #define elf_backend_post_process_headers elf_i386_post_process_headers
3896 #undef elf32_bed
3897 #define elf32_bed elf32_i386_fbsd_bed
3898
3899 #include "elf32-target.h"
3900
3901 /* VxWorks support. */
3902
3903 #undef TARGET_LITTLE_SYM
3904 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
3905 #undef TARGET_LITTLE_NAME
3906 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
3907 #undef ELF_OSABI
3908
3909 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
3910
3911 static struct bfd_link_hash_table *
3912 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
3913 {
3914 struct bfd_link_hash_table *ret;
3915 struct elf_i386_link_hash_table *htab;
3916
3917 ret = elf_i386_link_hash_table_create (abfd);
3918 if (ret)
3919 {
3920 htab = (struct elf_i386_link_hash_table *) ret;
3921 htab->is_vxworks = 1;
3922 htab->plt0_pad_byte = 0x90;
3923 }
3924
3925 return ret;
3926 }
3927
3928
3929 #undef elf_backend_post_process_headers
3930 #undef bfd_elf32_bfd_link_hash_table_create
3931 #define bfd_elf32_bfd_link_hash_table_create \
3932 elf_i386_vxworks_link_hash_table_create
3933 #undef elf_backend_add_symbol_hook
3934 #define elf_backend_add_symbol_hook \
3935 elf_vxworks_add_symbol_hook
3936 #undef elf_backend_link_output_symbol_hook
3937 #define elf_backend_link_output_symbol_hook \
3938 elf_vxworks_link_output_symbol_hook
3939 #undef elf_backend_emit_relocs
3940 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
3941 #undef elf_backend_final_write_processing
3942 #define elf_backend_final_write_processing \
3943 elf_vxworks_final_write_processing
3944
3945 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
3946 define it. */
3947 #undef elf_backend_want_plt_sym
3948 #define elf_backend_want_plt_sym 1
3949
3950 #undef elf32_bed
3951 #define elf32_bed elf32_i386_vxworks_bed
3952
3953 #include "elf32-target.h"
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