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[binutils.git] / bfd / elf32-i386.c
blob7d14fef561d8ddd32249105bd146d59905cfa627
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, 2008 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 #include "bfd_stdint.h"
29
30 /* 386 uses REL relocations instead of RELA. */
31 #define USE_REL 1
32
33 #include "elf/i386.h"
34
35 static reloc_howto_type elf_howto_table[]=
36 {
37 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_NONE",
39 TRUE, 0x00000000, 0x00000000, FALSE),
40 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_32",
42 TRUE, 0xffffffff, 0xffffffff, FALSE),
43 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_PC32",
45 TRUE, 0xffffffff, 0xffffffff, TRUE),
46 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_GOT32",
48 TRUE, 0xffffffff, 0xffffffff, FALSE),
49 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_PLT32",
51 TRUE, 0xffffffff, 0xffffffff, TRUE),
52 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_COPY",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_RELATIVE",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTOFF",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTPC",
69 TRUE, 0xffffffff, 0xffffffff, TRUE),
70
71 /* We have a gap in the reloc numbers here.
72 R_386_standard counts the number up to this point, and
73 R_386_ext_offset is the value to subtract from a reloc type of
74 R_386_16 thru R_386_PC8 to form an index into this table. */
75 #define R_386_standard (R_386_GOTPC + 1)
76 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
77
78 /* These relocs are a GNU extension. */
79 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_IE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_LE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_GD",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_LDM",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_16",
99 TRUE, 0xffff, 0xffff, FALSE),
100 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_PC16",
102 TRUE, 0xffff, 0xffff, TRUE),
103 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_8",
105 TRUE, 0xff, 0xff, FALSE),
106 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
107 bfd_elf_generic_reloc, "R_386_PC8",
108 TRUE, 0xff, 0xff, TRUE),
109
110 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
111 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
112 /* These are common with Solaris TLS implementation. */
113 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 EMPTY_HOWTO (38),
132 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
136 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
137 FALSE, 0, 0, FALSE),
138 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_DESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141
142 /* Another gap. */
143 #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset)
144 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
145
146 /* GNU extension to record C++ vtable hierarchy. */
147 HOWTO (R_386_GNU_VTINHERIT, /* type */
148 0, /* rightshift */
149 2, /* size (0 = byte, 1 = short, 2 = long) */
150 0, /* bitsize */
151 FALSE, /* pc_relative */
152 0, /* bitpos */
153 complain_overflow_dont, /* complain_on_overflow */
154 NULL, /* special_function */
155 "R_386_GNU_VTINHERIT", /* name */
156 FALSE, /* partial_inplace */
157 0, /* src_mask */
158 0, /* dst_mask */
159 FALSE), /* pcrel_offset */
160
161 /* GNU extension to record C++ vtable member usage. */
162 HOWTO (R_386_GNU_VTENTRY, /* type */
163 0, /* rightshift */
164 2, /* size (0 = byte, 1 = short, 2 = long) */
165 0, /* bitsize */
166 FALSE, /* pc_relative */
167 0, /* bitpos */
168 complain_overflow_dont, /* complain_on_overflow */
169 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
170 "R_386_GNU_VTENTRY", /* name */
171 FALSE, /* partial_inplace */
172 0, /* src_mask */
173 0, /* dst_mask */
174 FALSE) /* pcrel_offset */
175
176 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
177
178 };
179
180 #ifdef DEBUG_GEN_RELOC
181 #define TRACE(str) \
182 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
183 #else
184 #define TRACE(str)
185 #endif
186
187 static reloc_howto_type *
188 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
189 bfd_reloc_code_real_type code)
190 {
191 switch (code)
192 {
193 case BFD_RELOC_NONE:
194 TRACE ("BFD_RELOC_NONE");
195 return &elf_howto_table[R_386_NONE];
196
197 case BFD_RELOC_32:
198 TRACE ("BFD_RELOC_32");
199 return &elf_howto_table[R_386_32];
200
201 case BFD_RELOC_CTOR:
202 TRACE ("BFD_RELOC_CTOR");
203 return &elf_howto_table[R_386_32];
204
205 case BFD_RELOC_32_PCREL:
206 TRACE ("BFD_RELOC_PC32");
207 return &elf_howto_table[R_386_PC32];
208
209 case BFD_RELOC_386_GOT32:
210 TRACE ("BFD_RELOC_386_GOT32");
211 return &elf_howto_table[R_386_GOT32];
212
213 case BFD_RELOC_386_PLT32:
214 TRACE ("BFD_RELOC_386_PLT32");
215 return &elf_howto_table[R_386_PLT32];
216
217 case BFD_RELOC_386_COPY:
218 TRACE ("BFD_RELOC_386_COPY");
219 return &elf_howto_table[R_386_COPY];
220
221 case BFD_RELOC_386_GLOB_DAT:
222 TRACE ("BFD_RELOC_386_GLOB_DAT");
223 return &elf_howto_table[R_386_GLOB_DAT];
224
225 case BFD_RELOC_386_JUMP_SLOT:
226 TRACE ("BFD_RELOC_386_JUMP_SLOT");
227 return &elf_howto_table[R_386_JUMP_SLOT];
228
229 case BFD_RELOC_386_RELATIVE:
230 TRACE ("BFD_RELOC_386_RELATIVE");
231 return &elf_howto_table[R_386_RELATIVE];
232
233 case BFD_RELOC_386_GOTOFF:
234 TRACE ("BFD_RELOC_386_GOTOFF");
235 return &elf_howto_table[R_386_GOTOFF];
236
237 case BFD_RELOC_386_GOTPC:
238 TRACE ("BFD_RELOC_386_GOTPC");
239 return &elf_howto_table[R_386_GOTPC];
240
241 /* These relocs are a GNU extension. */
242 case BFD_RELOC_386_TLS_TPOFF:
243 TRACE ("BFD_RELOC_386_TLS_TPOFF");
244 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
245
246 case BFD_RELOC_386_TLS_IE:
247 TRACE ("BFD_RELOC_386_TLS_IE");
248 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
249
250 case BFD_RELOC_386_TLS_GOTIE:
251 TRACE ("BFD_RELOC_386_TLS_GOTIE");
252 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_LE:
255 TRACE ("BFD_RELOC_386_TLS_LE");
256 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GD:
259 TRACE ("BFD_RELOC_386_TLS_GD");
260 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LDM:
263 TRACE ("BFD_RELOC_386_TLS_LDM");
264 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
265
266 case BFD_RELOC_16:
267 TRACE ("BFD_RELOC_16");
268 return &elf_howto_table[R_386_16 - R_386_ext_offset];
269
270 case BFD_RELOC_16_PCREL:
271 TRACE ("BFD_RELOC_16_PCREL");
272 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
273
274 case BFD_RELOC_8:
275 TRACE ("BFD_RELOC_8");
276 return &elf_howto_table[R_386_8 - R_386_ext_offset];
277
278 case BFD_RELOC_8_PCREL:
279 TRACE ("BFD_RELOC_8_PCREL");
280 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
281
282 /* Common with Sun TLS implementation. */
283 case BFD_RELOC_386_TLS_LDO_32:
284 TRACE ("BFD_RELOC_386_TLS_LDO_32");
285 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
286
287 case BFD_RELOC_386_TLS_IE_32:
288 TRACE ("BFD_RELOC_386_TLS_IE_32");
289 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
290
291 case BFD_RELOC_386_TLS_LE_32:
292 TRACE ("BFD_RELOC_386_TLS_LE_32");
293 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_DTPMOD32:
296 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
297 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_DTPOFF32:
300 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
301 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_TPOFF32:
304 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
305 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_GOTDESC:
308 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
309 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DESC_CALL:
312 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
313 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_DESC:
316 TRACE ("BFD_RELOC_386_TLS_DESC");
317 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
318
319 case BFD_RELOC_VTABLE_INHERIT:
320 TRACE ("BFD_RELOC_VTABLE_INHERIT");
321 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
322
323 case BFD_RELOC_VTABLE_ENTRY:
324 TRACE ("BFD_RELOC_VTABLE_ENTRY");
325 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
326
327 default:
328 break;
329 }
330
331 TRACE ("Unknown");
332 return 0;
333 }
334
335 static reloc_howto_type *
336 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
337 const char *r_name)
338 {
339 unsigned int i;
340
341 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
342 if (elf_howto_table[i].name != NULL
343 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
344 return &elf_howto_table[i];
345
346 return NULL;
347 }
348
349 static reloc_howto_type *
350 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
351 {
352 unsigned int indx;
353
354 if ((indx = r_type) >= R_386_standard
355 && ((indx = r_type - R_386_ext_offset) - R_386_standard
356 >= R_386_ext - R_386_standard)
357 && ((indx = r_type - R_386_tls_offset) - R_386_ext
358 >= R_386_tls - R_386_ext)
359 && ((indx = r_type - R_386_vt_offset) - R_386_tls
360 >= R_386_vt - R_386_tls))
361 {
362 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
363 abfd, (int) r_type);
364 indx = R_386_NONE;
365 }
366 BFD_ASSERT (elf_howto_table [indx].type == r_type);
367 return &elf_howto_table[indx];
368 }
369
370 static void
371 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
372 arelent *cache_ptr,
373 Elf_Internal_Rela *dst)
374 {
375 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
376 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
377 }
378
379 /* Return whether a symbol name implies a local label. The UnixWare
380 2.1 cc generates temporary symbols that start with .X, so we
381 recognize them here. FIXME: do other SVR4 compilers also use .X?.
382 If so, we should move the .X recognition into
383 _bfd_elf_is_local_label_name. */
384
385 static bfd_boolean
386 elf_i386_is_local_label_name (bfd *abfd, const char *name)
387 {
388 if (name[0] == '.' && name[1] == 'X')
389 return TRUE;
390
391 return _bfd_elf_is_local_label_name (abfd, name);
392 }
393 \f
394 /* Support for core dump NOTE sections. */
395
396 static bfd_boolean
397 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
398 {
399 int offset;
400 size_t size;
401
402 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
403 {
404 int pr_version = bfd_get_32 (abfd, note->descdata);
405
406 if (pr_version != 1)
407 return FALSE;
408
409 /* pr_cursig */
410 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
411
412 /* pr_pid */
413 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
414
415 /* pr_reg */
416 offset = 28;
417 size = bfd_get_32 (abfd, note->descdata + 8);
418 }
419 else
420 {
421 switch (note->descsz)
422 {
423 default:
424 return FALSE;
425
426 case 144: /* Linux/i386 */
427 /* pr_cursig */
428 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 72;
435 size = 68;
436
437 break;
438 }
439 }
440
441 /* Make a ".reg/999" section. */
442 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
443 size, note->descpos + offset);
444 }
445
446 static bfd_boolean
447 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
448 {
449 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
450 {
451 int pr_version = bfd_get_32 (abfd, note->descdata);
452
453 if (pr_version != 1)
454 return FALSE;
455
456 elf_tdata (abfd)->core_program
457 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
458 elf_tdata (abfd)->core_command
459 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
460 }
461 else
462 {
463 switch (note->descsz)
464 {
465 default:
466 return FALSE;
467
468 case 124: /* Linux/i386 elf_prpsinfo. */
469 elf_tdata (abfd)->core_program
470 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
471 elf_tdata (abfd)->core_command
472 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
473 }
474 }
475
476 /* Note that for some reason, a spurious space is tacked
477 onto the end of the args in some (at least one anyway)
478 implementations, so strip it off if it exists. */
479 {
480 char *command = elf_tdata (abfd)->core_command;
481 int n = strlen (command);
482
483 if (0 < n && command[n - 1] == ' ')
484 command[n - 1] = '\0';
485 }
486
487 return TRUE;
488 }
489 \f
490 /* Functions for the i386 ELF linker.
491
492 In order to gain some understanding of code in this file without
493 knowing all the intricate details of the linker, note the
494 following:
495
496 Functions named elf_i386_* are called by external routines, other
497 functions are only called locally. elf_i386_* functions appear
498 in this file more or less in the order in which they are called
499 from external routines. eg. elf_i386_check_relocs is called
500 early in the link process, elf_i386_finish_dynamic_sections is
501 one of the last functions. */
502
503
504 /* The name of the dynamic interpreter. This is put in the .interp
505 section. */
506
507 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
508
509 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
510 copying dynamic variables from a shared lib into an app's dynbss
511 section, and instead use a dynamic relocation to point into the
512 shared lib. */
513 #define ELIMINATE_COPY_RELOCS 1
514
515 /* The size in bytes of an entry in the procedure linkage table. */
516
517 #define PLT_ENTRY_SIZE 16
518
519 /* The first entry in an absolute procedure linkage table looks like
520 this. See the SVR4 ABI i386 supplement to see how this works.
521 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
522
523 static const bfd_byte elf_i386_plt0_entry[12] =
524 {
525 0xff, 0x35, /* pushl contents of address */
526 0, 0, 0, 0, /* replaced with address of .got + 4. */
527 0xff, 0x25, /* jmp indirect */
528 0, 0, 0, 0 /* replaced with address of .got + 8. */
529 };
530
531 /* Subsequent entries in an absolute procedure linkage table look like
532 this. */
533
534 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
535 {
536 0xff, 0x25, /* jmp indirect */
537 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
538 0x68, /* pushl immediate */
539 0, 0, 0, 0, /* replaced with offset into relocation table. */
540 0xe9, /* jmp relative */
541 0, 0, 0, 0 /* replaced with offset to start of .plt. */
542 };
543
544 /* The first entry in a PIC procedure linkage table look like this.
545 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
546
547 static const bfd_byte elf_i386_pic_plt0_entry[12] =
548 {
549 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
550 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
551 };
552
553 /* Subsequent entries in a PIC procedure linkage table look like this. */
554
555 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
556 {
557 0xff, 0xa3, /* jmp *offset(%ebx) */
558 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
559 0x68, /* pushl immediate */
560 0, 0, 0, 0, /* replaced with offset into relocation table. */
561 0xe9, /* jmp relative */
562 0, 0, 0, 0 /* replaced with offset to start of .plt. */
563 };
564
565 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
566 for the PLTResolve stub and then for each PLT entry. */
567 #define PLTRESOLVE_RELOCS_SHLIB 0
568 #define PLTRESOLVE_RELOCS 2
569 #define PLT_NON_JUMP_SLOT_RELOCS 2
570
571 /* The i386 linker needs to keep track of the number of relocs that it
572 decides to copy as dynamic relocs in check_relocs for each symbol.
573 This is so that it can later discard them if they are found to be
574 unnecessary. We store the information in a field extending the
575 regular ELF linker hash table. */
576
577 struct elf_i386_dyn_relocs
578 {
579 struct elf_i386_dyn_relocs *next;
580
581 /* The input section of the reloc. */
582 asection *sec;
583
584 /* Total number of relocs copied for the input section. */
585 bfd_size_type count;
586
587 /* Number of pc-relative relocs copied for the input section. */
588 bfd_size_type pc_count;
589 };
590
591 /* i386 ELF linker hash entry. */
592
593 struct elf_i386_link_hash_entry
594 {
595 struct elf_link_hash_entry elf;
596
597 /* Track dynamic relocs copied for this symbol. */
598 struct elf_i386_dyn_relocs *dyn_relocs;
599
600 #define GOT_UNKNOWN 0
601 #define GOT_NORMAL 1
602 #define GOT_TLS_GD 2
603 #define GOT_TLS_IE 4
604 #define GOT_TLS_IE_POS 5
605 #define GOT_TLS_IE_NEG 6
606 #define GOT_TLS_IE_BOTH 7
607 #define GOT_TLS_GDESC 8
608 #define GOT_TLS_GD_BOTH_P(type) \
609 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
610 #define GOT_TLS_GD_P(type) \
611 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
612 #define GOT_TLS_GDESC_P(type) \
613 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
614 #define GOT_TLS_GD_ANY_P(type) \
615 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
616 unsigned char tls_type;
617
618 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
619 starting at the end of the jump table. */
620 bfd_vma tlsdesc_got;
621 };
622
623 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
624
625 struct elf_i386_obj_tdata
626 {
627 struct elf_obj_tdata root;
628
629 /* tls_type for each local got entry. */
630 char *local_got_tls_type;
631
632 /* GOTPLT entries for TLS descriptors. */
633 bfd_vma *local_tlsdesc_gotent;
634 };
635
636 #define elf_i386_tdata(abfd) \
637 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
638
639 #define elf_i386_local_got_tls_type(abfd) \
640 (elf_i386_tdata (abfd)->local_got_tls_type)
641
642 #define elf_i386_local_tlsdesc_gotent(abfd) \
643 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
644
645 #define is_i386_elf(bfd) \
646 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
647 && elf_tdata (bfd) != NULL \
648 && elf_object_id (bfd) == I386_ELF_TDATA)
649
650 static bfd_boolean
651 elf_i386_mkobject (bfd *abfd)
652 {
653 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
654 I386_ELF_TDATA);
655 }
656
657 /* i386 ELF linker hash table. */
658
659 struct elf_i386_link_hash_table
660 {
661 struct elf_link_hash_table elf;
662
663 /* Short-cuts to get to dynamic linker sections. */
664 asection *sgot;
665 asection *sgotplt;
666 asection *srelgot;
667 asection *splt;
668 asection *srelplt;
669 asection *sdynbss;
670 asection *srelbss;
671
672 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
673 asection *srelplt2;
674
675 /* True if the target system is VxWorks. */
676 int is_vxworks;
677
678 /* Value used to fill the last word of the first plt entry. */
679 bfd_byte plt0_pad_byte;
680
681 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
682 bfd_vma next_tls_desc_index;
683
684 union {
685 bfd_signed_vma refcount;
686 bfd_vma offset;
687 } tls_ldm_got;
688
689 /* The amount of space used by the reserved portion of the sgotplt
690 section, plus whatever space is used by the jump slots. */
691 bfd_vma sgotplt_jump_table_size;
692
693 /* Small local sym to section mapping cache. */
694 struct sym_sec_cache sym_sec;
695
696 /* _TLS_MODULE_BASE_ symbol. */
697 struct bfd_link_hash_entry *tls_module_base;
698 };
699
700 /* Get the i386 ELF linker hash table from a link_info structure. */
701
702 #define elf_i386_hash_table(p) \
703 ((struct elf_i386_link_hash_table *) ((p)->hash))
704
705 #define elf_i386_compute_jump_table_size(htab) \
706 ((htab)->next_tls_desc_index * 4)
707
708 /* Create an entry in an i386 ELF linker hash table. */
709
710 static struct bfd_hash_entry *
711 link_hash_newfunc (struct bfd_hash_entry *entry,
712 struct bfd_hash_table *table,
713 const char *string)
714 {
715 /* Allocate the structure if it has not already been allocated by a
716 subclass. */
717 if (entry == NULL)
718 {
719 entry = bfd_hash_allocate (table,
720 sizeof (struct elf_i386_link_hash_entry));
721 if (entry == NULL)
722 return entry;
723 }
724
725 /* Call the allocation method of the superclass. */
726 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
727 if (entry != NULL)
728 {
729 struct elf_i386_link_hash_entry *eh;
730
731 eh = (struct elf_i386_link_hash_entry *) entry;
732 eh->dyn_relocs = NULL;
733 eh->tls_type = GOT_UNKNOWN;
734 eh->tlsdesc_got = (bfd_vma) -1;
735 }
736
737 return entry;
738 }
739
740 /* Create an i386 ELF linker hash table. */
741
742 static struct bfd_link_hash_table *
743 elf_i386_link_hash_table_create (bfd *abfd)
744 {
745 struct elf_i386_link_hash_table *ret;
746 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
747
748 ret = bfd_malloc (amt);
749 if (ret == NULL)
750 return NULL;
751
752 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
753 sizeof (struct elf_i386_link_hash_entry)))
754 {
755 free (ret);
756 return NULL;
757 }
758
759 ret->sgot = NULL;
760 ret->sgotplt = NULL;
761 ret->srelgot = NULL;
762 ret->splt = NULL;
763 ret->srelplt = NULL;
764 ret->sdynbss = NULL;
765 ret->srelbss = NULL;
766 ret->tls_ldm_got.refcount = 0;
767 ret->next_tls_desc_index = 0;
768 ret->sgotplt_jump_table_size = 0;
769 ret->sym_sec.abfd = NULL;
770 ret->is_vxworks = 0;
771 ret->srelplt2 = NULL;
772 ret->plt0_pad_byte = 0;
773 ret->tls_module_base = NULL;
774
775 return &ret->elf.root;
776 }
777
778 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
779 shortcuts to them in our hash table. */
780
781 static bfd_boolean
782 create_got_section (bfd *dynobj, struct bfd_link_info *info)
783 {
784 struct elf_i386_link_hash_table *htab;
785
786 if (! _bfd_elf_create_got_section (dynobj, info))
787 return FALSE;
788
789 htab = elf_i386_hash_table (info);
790 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
791 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
792 if (!htab->sgot || !htab->sgotplt)
793 abort ();
794
795 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
796 (SEC_ALLOC | SEC_LOAD
797 | SEC_HAS_CONTENTS
798 | SEC_IN_MEMORY
799 | SEC_LINKER_CREATED
800 | SEC_READONLY));
801 if (htab->srelgot == NULL
802 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
803 return FALSE;
804 return TRUE;
805 }
806
807 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
808 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
809 hash table. */
810
811 static bfd_boolean
812 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
813 {
814 struct elf_i386_link_hash_table *htab;
815
816 htab = elf_i386_hash_table (info);
817 if (!htab->sgot && !create_got_section (dynobj, info))
818 return FALSE;
819
820 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
821 return FALSE;
822
823 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
824 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
825 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
826 if (!info->shared)
827 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
828
829 if (!htab->splt || !htab->srelplt || !htab->sdynbss
830 || (!info->shared && !htab->srelbss))
831 abort ();
832
833 if (htab->is_vxworks
834 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2))
835 return FALSE;
836
837 return TRUE;
838 }
839
840 /* Copy the extra info we tack onto an elf_link_hash_entry. */
841
842 static void
843 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
844 struct elf_link_hash_entry *dir,
845 struct elf_link_hash_entry *ind)
846 {
847 struct elf_i386_link_hash_entry *edir, *eind;
848
849 edir = (struct elf_i386_link_hash_entry *) dir;
850 eind = (struct elf_i386_link_hash_entry *) ind;
851
852 if (eind->dyn_relocs != NULL)
853 {
854 if (edir->dyn_relocs != NULL)
855 {
856 struct elf_i386_dyn_relocs **pp;
857 struct elf_i386_dyn_relocs *p;
858
859 /* Add reloc counts against the indirect sym to the direct sym
860 list. Merge any entries against the same section. */
861 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
862 {
863 struct elf_i386_dyn_relocs *q;
864
865 for (q = edir->dyn_relocs; q != NULL; q = q->next)
866 if (q->sec == p->sec)
867 {
868 q->pc_count += p->pc_count;
869 q->count += p->count;
870 *pp = p->next;
871 break;
872 }
873 if (q == NULL)
874 pp = &p->next;
875 }
876 *pp = edir->dyn_relocs;
877 }
878
879 edir->dyn_relocs = eind->dyn_relocs;
880 eind->dyn_relocs = NULL;
881 }
882
883 if (ind->root.type == bfd_link_hash_indirect
884 && dir->got.refcount <= 0)
885 {
886 edir->tls_type = eind->tls_type;
887 eind->tls_type = GOT_UNKNOWN;
888 }
889
890 if (ELIMINATE_COPY_RELOCS
891 && ind->root.type != bfd_link_hash_indirect
892 && dir->dynamic_adjusted)
893 {
894 /* If called to transfer flags for a weakdef during processing
895 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
896 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
897 dir->ref_dynamic |= ind->ref_dynamic;
898 dir->ref_regular |= ind->ref_regular;
899 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
900 dir->needs_plt |= ind->needs_plt;
901 dir->pointer_equality_needed |= ind->pointer_equality_needed;
902 }
903 else
904 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
905 }
906
907 typedef union
908 {
909 unsigned char c[2];
910 uint16_t i;
911 }
912 i386_opcode16;
913
914 /* Return TRUE if the TLS access code sequence support transition
915 from R_TYPE. */
916
917 static bfd_boolean
918 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
919 bfd_byte *contents,
920 Elf_Internal_Shdr *symtab_hdr,
921 struct elf_link_hash_entry **sym_hashes,
922 unsigned int r_type,
923 const Elf_Internal_Rela *rel,
924 const Elf_Internal_Rela *relend)
925 {
926 unsigned int val, type;
927 unsigned long r_symndx;
928 struct elf_link_hash_entry *h;
929 bfd_vma offset;
930
931 /* Get the section contents. */
932 if (contents == NULL)
933 {
934 if (elf_section_data (sec)->this_hdr.contents != NULL)
935 contents = elf_section_data (sec)->this_hdr.contents;
936 else
937 {
938 /* FIXME: How to better handle error condition? */
939 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
940 return FALSE;
941
942 /* Cache the section contents for elf_link_input_bfd. */
943 elf_section_data (sec)->this_hdr.contents = contents;
944 }
945 }
946
947 offset = rel->r_offset;
948 switch (r_type)
949 {
950 case R_386_TLS_GD:
951 case R_386_TLS_LDM:
952 if (offset < 2 || (rel + 1) >= relend)
953 return FALSE;
954
955 type = bfd_get_8 (abfd, contents + offset - 2);
956 if (r_type == R_386_TLS_GD)
957 {
958 /* Check transition from LD access model. Only
959 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
960 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
961 can transit to different access model. */
962 if ((offset + 10) > sec->size ||
963 (type != 0x8d && type != 0x04))
964 return FALSE;
965
966 val = bfd_get_8 (abfd, contents + offset - 1);
967 if (type == 0x04)
968 {
969 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
970 if (offset < 3)
971 return FALSE;
972
973 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
974 return FALSE;
975
976 if ((val & 0xc7) != 0x05 || val == (4 << 3))
977 return FALSE;
978 }
979 else
980 {
981 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
982 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
983 return FALSE;
984
985 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
986 return FALSE;
987 }
988 }
989 else
990 {
991 /* Check transition from LD access model. Only
992 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
993 can transit to different access model. */
994 if (type != 0x8d || (offset + 9) > sec->size)
995 return FALSE;
996
997 val = bfd_get_8 (abfd, contents + offset - 1);
998 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
999 return FALSE;
1000 }
1001
1002 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1003 return FALSE;
1004
1005 r_symndx = ELF32_R_SYM (rel[1].r_info);
1006 if (r_symndx < symtab_hdr->sh_info)
1007 return FALSE;
1008
1009 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1010 return (h != NULL
1011 && h->root.root.string != NULL
1012 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1013 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1014 && (strcmp (h->root.root.string, "___tls_get_addr") == 0));
1015
1016 case R_386_TLS_IE:
1017 /* Check transition from IE access model:
1018 movl foo@indntpoff(%rip), %eax
1019 movl foo@indntpoff(%rip), %reg
1020 addl foo@indntpoff(%rip), %reg
1021 */
1022
1023 if (offset < 1 || (offset + 4) > sec->size)
1024 return FALSE;
1025
1026 /* Check "movl foo@tpoff(%rip), %eax" first. */
1027 val = bfd_get_8 (abfd, contents + offset - 1);
1028 if (val == 0xa1)
1029 return TRUE;
1030
1031 if (offset < 2)
1032 return FALSE;
1033
1034 /* Check movl|addl foo@tpoff(%rip), %reg. */
1035 type = bfd_get_8 (abfd, contents + offset - 2);
1036 return ((type == 0x8b || type == 0x03)
1037 && (val & 0xc7) == 0x05);
1038
1039 case R_386_TLS_GOTIE:
1040 case R_386_TLS_IE_32:
1041 /* Check transition from {IE_32,GOTIE} access model:
1042 subl foo@{tpoff,gontoff}(%reg1), %reg2
1043 movl foo@{tpoff,gontoff}(%reg1), %reg2
1044 addl foo@{tpoff,gontoff}(%reg1), %reg2
1045 */
1046
1047 if (offset < 2 || (offset + 4) > sec->size)
1048 return FALSE;
1049
1050 val = bfd_get_8 (abfd, contents + offset - 1);
1051 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1052 return FALSE;
1053
1054 type = bfd_get_8 (abfd, contents + offset - 2);
1055 return type == 0x8b || type == 0x2b || type == 0x03;
1056
1057 case R_386_TLS_GOTDESC:
1058 /* Check transition from GDesc access model:
1059 leal x@tlsdesc(%ebx), %eax
1060
1061 Make sure it's a leal adding ebx to a 32-bit offset
1062 into any register, although it's probably almost always
1063 going to be eax. */
1064
1065 if (offset < 2 || (offset + 4) > sec->size)
1066 return FALSE;
1067
1068 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1069 return FALSE;
1070
1071 val = bfd_get_8 (abfd, contents + offset - 1);
1072 return (val & 0xc7) == 0x83;
1073
1074 case R_386_TLS_DESC_CALL:
1075 /* Check transition from GDesc access model:
1076 call *x@tlsdesc(%rax)
1077 */
1078 if (offset + 2 <= sec->size)
1079 {
1080 /* Make sure that it's a call *x@tlsdesc(%rax). */
1081 static i386_opcode16 call = { { 0xff, 0x10 } };
1082 return bfd_get_16 (abfd, contents + offset) == call.i;
1083 }
1084
1085 return FALSE;
1086
1087 default:
1088 abort ();
1089 }
1090 }
1091
1092 /* Return TRUE if the TLS access transition is OK or no transition
1093 will be performed. Update R_TYPE if there is a transition. */
1094
1095 static bfd_boolean
1096 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1097 asection *sec, bfd_byte *contents,
1098 Elf_Internal_Shdr *symtab_hdr,
1099 struct elf_link_hash_entry **sym_hashes,
1100 unsigned int *r_type, int tls_type,
1101 const Elf_Internal_Rela *rel,
1102 const Elf_Internal_Rela *relend,
1103 struct elf_link_hash_entry *h)
1104 {
1105 unsigned int from_type = *r_type;
1106 unsigned int to_type = from_type;
1107 bfd_boolean check = TRUE;
1108
1109 switch (from_type)
1110 {
1111 case R_386_TLS_GD:
1112 case R_386_TLS_GOTDESC:
1113 case R_386_TLS_DESC_CALL:
1114 case R_386_TLS_IE_32:
1115 case R_386_TLS_IE:
1116 case R_386_TLS_GOTIE:
1117 if (!info->shared)
1118 {
1119 if (h == NULL)
1120 to_type = R_386_TLS_LE_32;
1121 else if (from_type != R_386_TLS_IE
1122 && from_type != R_386_TLS_GOTIE)
1123 to_type = R_386_TLS_IE_32;
1124 }
1125
1126 /* When we are called from elf_i386_relocate_section, CONTENTS
1127 isn't NULL and there may be additional transitions based on
1128 TLS_TYPE. */
1129 if (contents != NULL)
1130 {
1131 unsigned int new_to_type = to_type;
1132
1133 if (!info->shared
1134 && h != NULL
1135 && h->dynindx == -1
1136 && (tls_type & GOT_TLS_IE))
1137 new_to_type = R_386_TLS_LE_32;
1138
1139 if (to_type == R_386_TLS_GD
1140 || to_type == R_386_TLS_GOTDESC
1141 || to_type == R_386_TLS_DESC_CALL)
1142 {
1143 if (tls_type == GOT_TLS_IE_POS)
1144 new_to_type = R_386_TLS_GOTIE;
1145 else if (tls_type & GOT_TLS_IE)
1146 new_to_type = R_386_TLS_IE_32;
1147 }
1148
1149 /* We checked the transition before when we were called from
1150 elf_i386_check_relocs. We only want to check the new
1151 transition which hasn't been checked before. */
1152 check = new_to_type != to_type && from_type == to_type;
1153 to_type = new_to_type;
1154 }
1155
1156 break;
1157
1158 case R_386_TLS_LDM:
1159 if (!info->shared)
1160 to_type = R_386_TLS_LE_32;
1161 break;
1162
1163 default:
1164 return TRUE;
1165 }
1166
1167 /* Return TRUE if there is no transition. */
1168 if (from_type == to_type)
1169 return TRUE;
1170
1171 /* Check if the transition can be performed. */
1172 if (check
1173 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1174 symtab_hdr, sym_hashes,
1175 from_type, rel, relend))
1176 {
1177 reloc_howto_type *from, *to;
1178
1179 from = elf_i386_rtype_to_howto (abfd, from_type);
1180 to = elf_i386_rtype_to_howto (abfd, to_type);
1181
1182 (*_bfd_error_handler)
1183 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1184 "in section `%A' failed"),
1185 abfd, sec, from->name, to->name,
1186 h ? h->root.root.string : "a local symbol",
1187 (unsigned long) rel->r_offset);
1188 bfd_set_error (bfd_error_bad_value);
1189 return FALSE;
1190 }
1191
1192 *r_type = to_type;
1193 return TRUE;
1194 }
1195
1196 /* Look through the relocs for a section during the first phase, and
1197 calculate needed space in the global offset table, procedure linkage
1198 table, and dynamic reloc sections. */
1199
1200 static bfd_boolean
1201 elf_i386_check_relocs (bfd *abfd,
1202 struct bfd_link_info *info,
1203 asection *sec,
1204 const Elf_Internal_Rela *relocs)
1205 {
1206 struct elf_i386_link_hash_table *htab;
1207 Elf_Internal_Shdr *symtab_hdr;
1208 struct elf_link_hash_entry **sym_hashes;
1209 const Elf_Internal_Rela *rel;
1210 const Elf_Internal_Rela *rel_end;
1211 asection *sreloc;
1212
1213 if (info->relocatable)
1214 return TRUE;
1215
1216 BFD_ASSERT (is_i386_elf (abfd));
1217
1218 htab = elf_i386_hash_table (info);
1219 symtab_hdr = &elf_symtab_hdr (abfd);
1220 sym_hashes = elf_sym_hashes (abfd);
1221
1222 sreloc = NULL;
1223
1224 rel_end = relocs + sec->reloc_count;
1225 for (rel = relocs; rel < rel_end; rel++)
1226 {
1227 unsigned int r_type;
1228 unsigned long r_symndx;
1229 struct elf_link_hash_entry *h;
1230
1231 r_symndx = ELF32_R_SYM (rel->r_info);
1232 r_type = ELF32_R_TYPE (rel->r_info);
1233
1234 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1235 {
1236 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1237 abfd,
1238 r_symndx);
1239 return FALSE;
1240 }
1241
1242 if (r_symndx < symtab_hdr->sh_info)
1243 h = NULL;
1244 else
1245 {
1246 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1247 while (h->root.type == bfd_link_hash_indirect
1248 || h->root.type == bfd_link_hash_warning)
1249 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1250 }
1251
1252 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1253 symtab_hdr, sym_hashes,
1254 &r_type, GOT_UNKNOWN,
1255 rel, rel_end, h))
1256 return FALSE;
1257
1258 switch (r_type)
1259 {
1260 case R_386_TLS_LDM:
1261 htab->tls_ldm_got.refcount += 1;
1262 goto create_got;
1263
1264 case R_386_PLT32:
1265 /* This symbol requires a procedure linkage table entry. We
1266 actually build the entry in adjust_dynamic_symbol,
1267 because this might be a case of linking PIC code which is
1268 never referenced by a dynamic object, in which case we
1269 don't need to generate a procedure linkage table entry
1270 after all. */
1271
1272 /* If this is a local symbol, we resolve it directly without
1273 creating a procedure linkage table entry. */
1274 if (h == NULL)
1275 continue;
1276
1277 h->needs_plt = 1;
1278 h->plt.refcount += 1;
1279 break;
1280
1281 case R_386_TLS_IE_32:
1282 case R_386_TLS_IE:
1283 case R_386_TLS_GOTIE:
1284 if (info->shared)
1285 info->flags |= DF_STATIC_TLS;
1286 /* Fall through */
1287
1288 case R_386_GOT32:
1289 case R_386_TLS_GD:
1290 case R_386_TLS_GOTDESC:
1291 case R_386_TLS_DESC_CALL:
1292 /* This symbol requires a global offset table entry. */
1293 {
1294 int tls_type, old_tls_type;
1295
1296 switch (r_type)
1297 {
1298 default:
1299 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1300 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1301 case R_386_TLS_GOTDESC:
1302 case R_386_TLS_DESC_CALL:
1303 tls_type = GOT_TLS_GDESC; break;
1304 case R_386_TLS_IE_32:
1305 if (ELF32_R_TYPE (rel->r_info) == r_type)
1306 tls_type = GOT_TLS_IE_NEG;
1307 else
1308 /* If this is a GD->IE transition, we may use either of
1309 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1310 tls_type = GOT_TLS_IE;
1311 break;
1312 case R_386_TLS_IE:
1313 case R_386_TLS_GOTIE:
1314 tls_type = GOT_TLS_IE_POS; break;
1315 }
1316
1317 if (h != NULL)
1318 {
1319 h->got.refcount += 1;
1320 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1321 }
1322 else
1323 {
1324 bfd_signed_vma *local_got_refcounts;
1325
1326 /* This is a global offset table entry for a local symbol. */
1327 local_got_refcounts = elf_local_got_refcounts (abfd);
1328 if (local_got_refcounts == NULL)
1329 {
1330 bfd_size_type size;
1331
1332 size = symtab_hdr->sh_info;
1333 size *= (sizeof (bfd_signed_vma)
1334 + sizeof (bfd_vma) + sizeof(char));
1335 local_got_refcounts = bfd_zalloc (abfd, size);
1336 if (local_got_refcounts == NULL)
1337 return FALSE;
1338 elf_local_got_refcounts (abfd) = local_got_refcounts;
1339 elf_i386_local_tlsdesc_gotent (abfd)
1340 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1341 elf_i386_local_got_tls_type (abfd)
1342 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1343 }
1344 local_got_refcounts[r_symndx] += 1;
1345 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1346 }
1347
1348 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1349 tls_type |= old_tls_type;
1350 /* If a TLS symbol is accessed using IE at least once,
1351 there is no point to use dynamic model for it. */
1352 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1353 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1354 || (tls_type & GOT_TLS_IE) == 0))
1355 {
1356 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1357 tls_type = old_tls_type;
1358 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1359 && GOT_TLS_GD_ANY_P (tls_type))
1360 tls_type |= old_tls_type;
1361 else
1362 {
1363 (*_bfd_error_handler)
1364 (_("%B: `%s' accessed both as normal and "
1365 "thread local symbol"),
1366 abfd,
1367 h ? h->root.root.string : "<local>");
1368 return FALSE;
1369 }
1370 }
1371
1372 if (old_tls_type != tls_type)
1373 {
1374 if (h != NULL)
1375 elf_i386_hash_entry (h)->tls_type = tls_type;
1376 else
1377 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1378 }
1379 }
1380 /* Fall through */
1381
1382 case R_386_GOTOFF:
1383 case R_386_GOTPC:
1384 create_got:
1385 if (htab->sgot == NULL)
1386 {
1387 if (htab->elf.dynobj == NULL)
1388 htab->elf.dynobj = abfd;
1389 if (!create_got_section (htab->elf.dynobj, info))
1390 return FALSE;
1391 }
1392 if (r_type != R_386_TLS_IE)
1393 break;
1394 /* Fall through */
1395
1396 case R_386_TLS_LE_32:
1397 case R_386_TLS_LE:
1398 if (!info->shared)
1399 break;
1400 info->flags |= DF_STATIC_TLS;
1401 /* Fall through */
1402
1403 case R_386_32:
1404 case R_386_PC32:
1405 if (h != NULL && !info->shared)
1406 {
1407 /* If this reloc is in a read-only section, we might
1408 need a copy reloc. We can't check reliably at this
1409 stage whether the section is read-only, as input
1410 sections have not yet been mapped to output sections.
1411 Tentatively set the flag for now, and correct in
1412 adjust_dynamic_symbol. */
1413 h->non_got_ref = 1;
1414
1415 /* We may need a .plt entry if the function this reloc
1416 refers to is in a shared lib. */
1417 h->plt.refcount += 1;
1418 if (r_type != R_386_PC32)
1419 h->pointer_equality_needed = 1;
1420 }
1421
1422 /* If we are creating a shared library, and this is a reloc
1423 against a global symbol, or a non PC relative reloc
1424 against a local symbol, then we need to copy the reloc
1425 into the shared library. However, if we are linking with
1426 -Bsymbolic, we do not need to copy a reloc against a
1427 global symbol which is defined in an object we are
1428 including in the link (i.e., DEF_REGULAR is set). At
1429 this point we have not seen all the input files, so it is
1430 possible that DEF_REGULAR is not set now but will be set
1431 later (it is never cleared). In case of a weak definition,
1432 DEF_REGULAR may be cleared later by a strong definition in
1433 a shared library. We account for that possibility below by
1434 storing information in the relocs_copied field of the hash
1435 table entry. A similar situation occurs when creating
1436 shared libraries and symbol visibility changes render the
1437 symbol local.
1438
1439 If on the other hand, we are creating an executable, we
1440 may need to keep relocations for symbols satisfied by a
1441 dynamic library if we manage to avoid copy relocs for the
1442 symbol. */
1443 if ((info->shared
1444 && (sec->flags & SEC_ALLOC) != 0
1445 && (r_type != R_386_PC32
1446 || (h != NULL
1447 && (! SYMBOLIC_BIND (info, h)
1448 || h->root.type == bfd_link_hash_defweak
1449 || !h->def_regular))))
1450 || (ELIMINATE_COPY_RELOCS
1451 && !info->shared
1452 && (sec->flags & SEC_ALLOC) != 0
1453 && h != NULL
1454 && (h->root.type == bfd_link_hash_defweak
1455 || !h->def_regular)))
1456 {
1457 struct elf_i386_dyn_relocs *p;
1458 struct elf_i386_dyn_relocs **head;
1459
1460 /* We must copy these reloc types into the output file.
1461 Create a reloc section in dynobj and make room for
1462 this reloc. */
1463 if (sreloc == NULL)
1464 {
1465 if (htab->elf.dynobj == NULL)
1466 htab->elf.dynobj = abfd;
1467
1468 sreloc = _bfd_elf_make_dynamic_reloc_section
1469 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1470
1471 if (sreloc == NULL)
1472 return FALSE;
1473 }
1474
1475 /* If this is a global symbol, we count the number of
1476 relocations we need for this symbol. */
1477 if (h != NULL)
1478 {
1479 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1480 }
1481 else
1482 {
1483 void **vpp;
1484 /* Track dynamic relocs needed for local syms too.
1485 We really need local syms available to do this
1486 easily. Oh well. */
1487
1488 asection *s;
1489 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1490 sec, r_symndx);
1491 if (s == NULL)
1492 return FALSE;
1493
1494 vpp = &elf_section_data (s)->local_dynrel;
1495 head = (struct elf_i386_dyn_relocs **)vpp;
1496 }
1497
1498 p = *head;
1499 if (p == NULL || p->sec != sec)
1500 {
1501 bfd_size_type amt = sizeof *p;
1502 p = bfd_alloc (htab->elf.dynobj, amt);
1503 if (p == NULL)
1504 return FALSE;
1505 p->next = *head;
1506 *head = p;
1507 p->sec = sec;
1508 p->count = 0;
1509 p->pc_count = 0;
1510 }
1511
1512 p->count += 1;
1513 if (r_type == R_386_PC32)
1514 p->pc_count += 1;
1515 }
1516 break;
1517
1518 /* This relocation describes the C++ object vtable hierarchy.
1519 Reconstruct it for later use during GC. */
1520 case R_386_GNU_VTINHERIT:
1521 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1522 return FALSE;
1523 break;
1524
1525 /* This relocation describes which C++ vtable entries are actually
1526 used. Record for later use during GC. */
1527 case R_386_GNU_VTENTRY:
1528 BFD_ASSERT (h != NULL);
1529 if (h != NULL
1530 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1531 return FALSE;
1532 break;
1533
1534 default:
1535 break;
1536 }
1537 }
1538
1539 return TRUE;
1540 }
1541
1542 /* Return the section that should be marked against GC for a given
1543 relocation. */
1544
1545 static asection *
1546 elf_i386_gc_mark_hook (asection *sec,
1547 struct bfd_link_info *info,
1548 Elf_Internal_Rela *rel,
1549 struct elf_link_hash_entry *h,
1550 Elf_Internal_Sym *sym)
1551 {
1552 if (h != NULL)
1553 switch (ELF32_R_TYPE (rel->r_info))
1554 {
1555 case R_386_GNU_VTINHERIT:
1556 case R_386_GNU_VTENTRY:
1557 return NULL;
1558 }
1559
1560 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1561 }
1562
1563 /* Update the got entry reference counts for the section being removed. */
1564
1565 static bfd_boolean
1566 elf_i386_gc_sweep_hook (bfd *abfd,
1567 struct bfd_link_info *info,
1568 asection *sec,
1569 const Elf_Internal_Rela *relocs)
1570 {
1571 Elf_Internal_Shdr *symtab_hdr;
1572 struct elf_link_hash_entry **sym_hashes;
1573 bfd_signed_vma *local_got_refcounts;
1574 const Elf_Internal_Rela *rel, *relend;
1575
1576 if (info->relocatable)
1577 return TRUE;
1578
1579 elf_section_data (sec)->local_dynrel = NULL;
1580
1581 symtab_hdr = &elf_symtab_hdr (abfd);
1582 sym_hashes = elf_sym_hashes (abfd);
1583 local_got_refcounts = elf_local_got_refcounts (abfd);
1584
1585 relend = relocs + sec->reloc_count;
1586 for (rel = relocs; rel < relend; rel++)
1587 {
1588 unsigned long r_symndx;
1589 unsigned int r_type;
1590 struct elf_link_hash_entry *h = NULL;
1591
1592 r_symndx = ELF32_R_SYM (rel->r_info);
1593 if (r_symndx >= symtab_hdr->sh_info)
1594 {
1595 struct elf_i386_link_hash_entry *eh;
1596 struct elf_i386_dyn_relocs **pp;
1597 struct elf_i386_dyn_relocs *p;
1598
1599 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1600 while (h->root.type == bfd_link_hash_indirect
1601 || h->root.type == bfd_link_hash_warning)
1602 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1603 eh = (struct elf_i386_link_hash_entry *) h;
1604
1605 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1606 if (p->sec == sec)
1607 {
1608 /* Everything must go for SEC. */
1609 *pp = p->next;
1610 break;
1611 }
1612 }
1613
1614 r_type = ELF32_R_TYPE (rel->r_info);
1615 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1616 symtab_hdr, sym_hashes,
1617 &r_type, GOT_UNKNOWN,
1618 rel, relend, h))
1619 return FALSE;
1620
1621 switch (r_type)
1622 {
1623 case R_386_TLS_LDM:
1624 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1625 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1626 break;
1627
1628 case R_386_TLS_GD:
1629 case R_386_TLS_GOTDESC:
1630 case R_386_TLS_DESC_CALL:
1631 case R_386_TLS_IE_32:
1632 case R_386_TLS_IE:
1633 case R_386_TLS_GOTIE:
1634 case R_386_GOT32:
1635 if (h != NULL)
1636 {
1637 if (h->got.refcount > 0)
1638 h->got.refcount -= 1;
1639 }
1640 else if (local_got_refcounts != NULL)
1641 {
1642 if (local_got_refcounts[r_symndx] > 0)
1643 local_got_refcounts[r_symndx] -= 1;
1644 }
1645 break;
1646
1647 case R_386_32:
1648 case R_386_PC32:
1649 if (info->shared)
1650 break;
1651 /* Fall through */
1652
1653 case R_386_PLT32:
1654 if (h != NULL)
1655 {
1656 if (h->plt.refcount > 0)
1657 h->plt.refcount -= 1;
1658 }
1659 break;
1660
1661 default:
1662 break;
1663 }
1664 }
1665
1666 return TRUE;
1667 }
1668
1669 /* Adjust a symbol defined by a dynamic object and referenced by a
1670 regular object. The current definition is in some section of the
1671 dynamic object, but we're not including those sections. We have to
1672 change the definition to something the rest of the link can
1673 understand. */
1674
1675 static bfd_boolean
1676 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1677 struct elf_link_hash_entry *h)
1678 {
1679 struct elf_i386_link_hash_table *htab;
1680 asection *s;
1681
1682 /* If this is a function, put it in the procedure linkage table. We
1683 will fill in the contents of the procedure linkage table later,
1684 when we know the address of the .got section. */
1685 if (h->type == STT_FUNC
1686 || h->needs_plt)
1687 {
1688 if (h->plt.refcount <= 0
1689 || SYMBOL_CALLS_LOCAL (info, h)
1690 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1691 && h->root.type == bfd_link_hash_undefweak))
1692 {
1693 /* This case can occur if we saw a PLT32 reloc in an input
1694 file, but the symbol was never referred to by a dynamic
1695 object, or if all references were garbage collected. In
1696 such a case, we don't actually need to build a procedure
1697 linkage table, and we can just do a PC32 reloc instead. */
1698 h->plt.offset = (bfd_vma) -1;
1699 h->needs_plt = 0;
1700 }
1701
1702 return TRUE;
1703 }
1704 else
1705 /* It's possible that we incorrectly decided a .plt reloc was
1706 needed for an R_386_PC32 reloc to a non-function sym in
1707 check_relocs. We can't decide accurately between function and
1708 non-function syms in check-relocs; Objects loaded later in
1709 the link may change h->type. So fix it now. */
1710 h->plt.offset = (bfd_vma) -1;
1711
1712 /* If this is a weak symbol, and there is a real definition, the
1713 processor independent code will have arranged for us to see the
1714 real definition first, and we can just use the same value. */
1715 if (h->u.weakdef != NULL)
1716 {
1717 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1718 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1719 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1720 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1721 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1722 h->non_got_ref = h->u.weakdef->non_got_ref;
1723 return TRUE;
1724 }
1725
1726 /* This is a reference to a symbol defined by a dynamic object which
1727 is not a function. */
1728
1729 /* If we are creating a shared library, we must presume that the
1730 only references to the symbol are via the global offset table.
1731 For such cases we need not do anything here; the relocations will
1732 be handled correctly by relocate_section. */
1733 if (info->shared)
1734 return TRUE;
1735
1736 /* If there are no references to this symbol that do not use the
1737 GOT, we don't need to generate a copy reloc. */
1738 if (!h->non_got_ref)
1739 return TRUE;
1740
1741 /* If -z nocopyreloc was given, we won't generate them either. */
1742 if (info->nocopyreloc)
1743 {
1744 h->non_got_ref = 0;
1745 return TRUE;
1746 }
1747
1748 htab = elf_i386_hash_table (info);
1749
1750 /* If there aren't any dynamic relocs in read-only sections, then
1751 we can keep the dynamic relocs and avoid the copy reloc. This
1752 doesn't work on VxWorks, where we can not have dynamic relocations
1753 (other than copy and jump slot relocations) in an executable. */
1754 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1755 {
1756 struct elf_i386_link_hash_entry * eh;
1757 struct elf_i386_dyn_relocs *p;
1758
1759 eh = (struct elf_i386_link_hash_entry *) h;
1760 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1761 {
1762 s = p->sec->output_section;
1763 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1764 break;
1765 }
1766
1767 if (p == NULL)
1768 {
1769 h->non_got_ref = 0;
1770 return TRUE;
1771 }
1772 }
1773
1774 if (h->size == 0)
1775 {
1776 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1777 h->root.root.string);
1778 return TRUE;
1779 }
1780
1781 /* We must allocate the symbol in our .dynbss section, which will
1782 become part of the .bss section of the executable. There will be
1783 an entry for this symbol in the .dynsym section. The dynamic
1784 object will contain position independent code, so all references
1785 from the dynamic object to this symbol will go through the global
1786 offset table. The dynamic linker will use the .dynsym entry to
1787 determine the address it must put in the global offset table, so
1788 both the dynamic object and the regular object will refer to the
1789 same memory location for the variable. */
1790
1791 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1792 copy the initial value out of the dynamic object and into the
1793 runtime process image. */
1794 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1795 {
1796 htab->srelbss->size += sizeof (Elf32_External_Rel);
1797 h->needs_copy = 1;
1798 }
1799
1800 s = htab->sdynbss;
1801
1802 return _bfd_elf_adjust_dynamic_copy (h, s);
1803 }
1804
1805 /* Allocate space in .plt, .got and associated reloc sections for
1806 dynamic relocs. */
1807
1808 static bfd_boolean
1809 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1810 {
1811 struct bfd_link_info *info;
1812 struct elf_i386_link_hash_table *htab;
1813 struct elf_i386_link_hash_entry *eh;
1814 struct elf_i386_dyn_relocs *p;
1815
1816 if (h->root.type == bfd_link_hash_indirect)
1817 return TRUE;
1818
1819 if (h->root.type == bfd_link_hash_warning)
1820 /* When warning symbols are created, they **replace** the "real"
1821 entry in the hash table, thus we never get to see the real
1822 symbol in a hash traversal. So look at it now. */
1823 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1824
1825 info = (struct bfd_link_info *) inf;
1826 htab = elf_i386_hash_table (info);
1827
1828 if (htab->elf.dynamic_sections_created
1829 && h->plt.refcount > 0)
1830 {
1831 /* Make sure this symbol is output as a dynamic symbol.
1832 Undefined weak syms won't yet be marked as dynamic. */
1833 if (h->dynindx == -1
1834 && !h->forced_local)
1835 {
1836 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1837 return FALSE;
1838 }
1839
1840 if (info->shared
1841 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1842 {
1843 asection *s = htab->splt;
1844
1845 /* If this is the first .plt entry, make room for the special
1846 first entry. */
1847 if (s->size == 0)
1848 s->size += PLT_ENTRY_SIZE;
1849
1850 h->plt.offset = s->size;
1851
1852 /* If this symbol is not defined in a regular file, and we are
1853 not generating a shared library, then set the symbol to this
1854 location in the .plt. This is required to make function
1855 pointers compare as equal between the normal executable and
1856 the shared library. */
1857 if (! info->shared
1858 && !h->def_regular)
1859 {
1860 h->root.u.def.section = s;
1861 h->root.u.def.value = h->plt.offset;
1862 }
1863
1864 /* Make room for this entry. */
1865 s->size += PLT_ENTRY_SIZE;
1866
1867 /* We also need to make an entry in the .got.plt section, which
1868 will be placed in the .got section by the linker script. */
1869 htab->sgotplt->size += 4;
1870
1871 /* We also need to make an entry in the .rel.plt section. */
1872 htab->srelplt->size += sizeof (Elf32_External_Rel);
1873 htab->next_tls_desc_index++;
1874
1875 if (htab->is_vxworks && !info->shared)
1876 {
1877 /* VxWorks has a second set of relocations for each PLT entry
1878 in executables. They go in a separate relocation section,
1879 which is processed by the kernel loader. */
1880
1881 /* There are two relocations for the initial PLT entry: an
1882 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1883 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1884
1885 if (h->plt.offset == PLT_ENTRY_SIZE)
1886 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1887
1888 /* There are two extra relocations for each subsequent PLT entry:
1889 an R_386_32 relocation for the GOT entry, and an R_386_32
1890 relocation for the PLT entry. */
1891
1892 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1893 }
1894 }
1895 else
1896 {
1897 h->plt.offset = (bfd_vma) -1;
1898 h->needs_plt = 0;
1899 }
1900 }
1901 else
1902 {
1903 h->plt.offset = (bfd_vma) -1;
1904 h->needs_plt = 0;
1905 }
1906
1907 eh = (struct elf_i386_link_hash_entry *) h;
1908 eh->tlsdesc_got = (bfd_vma) -1;
1909
1910 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1911 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1912 if (h->got.refcount > 0
1913 && !info->shared
1914 && h->dynindx == -1
1915 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1916 h->got.offset = (bfd_vma) -1;
1917 else if (h->got.refcount > 0)
1918 {
1919 asection *s;
1920 bfd_boolean dyn;
1921 int tls_type = elf_i386_hash_entry(h)->tls_type;
1922
1923 /* Make sure this symbol is output as a dynamic symbol.
1924 Undefined weak syms won't yet be marked as dynamic. */
1925 if (h->dynindx == -1
1926 && !h->forced_local)
1927 {
1928 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1929 return FALSE;
1930 }
1931
1932 s = htab->sgot;
1933 if (GOT_TLS_GDESC_P (tls_type))
1934 {
1935 eh->tlsdesc_got = htab->sgotplt->size
1936 - elf_i386_compute_jump_table_size (htab);
1937 htab->sgotplt->size += 8;
1938 h->got.offset = (bfd_vma) -2;
1939 }
1940 if (! GOT_TLS_GDESC_P (tls_type)
1941 || GOT_TLS_GD_P (tls_type))
1942 {
1943 h->got.offset = s->size;
1944 s->size += 4;
1945 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1946 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
1947 s->size += 4;
1948 }
1949 dyn = htab->elf.dynamic_sections_created;
1950 /* R_386_TLS_IE_32 needs one dynamic relocation,
1951 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1952 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1953 need two), R_386_TLS_GD needs one if local symbol and two if
1954 global. */
1955 if (tls_type == GOT_TLS_IE_BOTH)
1956 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1957 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1958 || (tls_type & GOT_TLS_IE))
1959 htab->srelgot->size += sizeof (Elf32_External_Rel);
1960 else if (GOT_TLS_GD_P (tls_type))
1961 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1962 else if (! GOT_TLS_GDESC_P (tls_type)
1963 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1964 || h->root.type != bfd_link_hash_undefweak)
1965 && (info->shared
1966 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1967 htab->srelgot->size += sizeof (Elf32_External_Rel);
1968 if (GOT_TLS_GDESC_P (tls_type))
1969 htab->srelplt->size += sizeof (Elf32_External_Rel);
1970 }
1971 else
1972 h->got.offset = (bfd_vma) -1;
1973
1974 if (eh->dyn_relocs == NULL)
1975 return TRUE;
1976
1977 /* In the shared -Bsymbolic case, discard space allocated for
1978 dynamic pc-relative relocs against symbols which turn out to be
1979 defined in regular objects. For the normal shared case, discard
1980 space for pc-relative relocs that have become local due to symbol
1981 visibility changes. */
1982
1983 if (info->shared)
1984 {
1985 /* The only reloc that uses pc_count is R_386_PC32, which will
1986 appear on a call or on something like ".long foo - .". We
1987 want calls to protected symbols to resolve directly to the
1988 function rather than going via the plt. If people want
1989 function pointer comparisons to work as expected then they
1990 should avoid writing assembly like ".long foo - .". */
1991 if (SYMBOL_CALLS_LOCAL (info, h))
1992 {
1993 struct elf_i386_dyn_relocs **pp;
1994
1995 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1996 {
1997 p->count -= p->pc_count;
1998 p->pc_count = 0;
1999 if (p->count == 0)
2000 *pp = p->next;
2001 else
2002 pp = &p->next;
2003 }
2004 }
2005
2006 if (htab->is_vxworks)
2007 {
2008 struct elf_i386_dyn_relocs **pp;
2009 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2010 {
2011 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2012 *pp = p->next;
2013 else
2014 pp = &p->next;
2015 }
2016 }
2017
2018 /* Also discard relocs on undefined weak syms with non-default
2019 visibility. */
2020 if (eh->dyn_relocs != NULL
2021 && h->root.type == bfd_link_hash_undefweak)
2022 {
2023 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2024 eh->dyn_relocs = NULL;
2025
2026 /* Make sure undefined weak symbols are output as a dynamic
2027 symbol in PIEs. */
2028 else if (h->dynindx == -1
2029 && !h->forced_local)
2030 {
2031 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2032 return FALSE;
2033 }
2034 }
2035 }
2036 else if (ELIMINATE_COPY_RELOCS)
2037 {
2038 /* For the non-shared case, discard space for relocs against
2039 symbols which turn out to need copy relocs or are not
2040 dynamic. */
2041
2042 if (!h->non_got_ref
2043 && ((h->def_dynamic
2044 && !h->def_regular)
2045 || (htab->elf.dynamic_sections_created
2046 && (h->root.type == bfd_link_hash_undefweak
2047 || h->root.type == bfd_link_hash_undefined))))
2048 {
2049 /* Make sure this symbol is output as a dynamic symbol.
2050 Undefined weak syms won't yet be marked as dynamic. */
2051 if (h->dynindx == -1
2052 && !h->forced_local)
2053 {
2054 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2055 return FALSE;
2056 }
2057
2058 /* If that succeeded, we know we'll be keeping all the
2059 relocs. */
2060 if (h->dynindx != -1)
2061 goto keep;
2062 }
2063
2064 eh->dyn_relocs = NULL;
2065
2066 keep: ;
2067 }
2068
2069 /* Finally, allocate space. */
2070 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2071 {
2072 asection *sreloc = elf_section_data (p->sec)->sreloc;
2073 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2074 }
2075
2076 return TRUE;
2077 }
2078
2079 /* Find any dynamic relocs that apply to read-only sections. */
2080
2081 static bfd_boolean
2082 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2083 {
2084 struct elf_i386_link_hash_entry *eh;
2085 struct elf_i386_dyn_relocs *p;
2086
2087 if (h->root.type == bfd_link_hash_warning)
2088 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2089
2090 eh = (struct elf_i386_link_hash_entry *) h;
2091 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2092 {
2093 asection *s = p->sec->output_section;
2094
2095 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2096 {
2097 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2098
2099 info->flags |= DF_TEXTREL;
2100
2101 /* Not an error, just cut short the traversal. */
2102 return FALSE;
2103 }
2104 }
2105 return TRUE;
2106 }
2107
2108 /* Set the sizes of the dynamic sections. */
2109
2110 static bfd_boolean
2111 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2112 struct bfd_link_info *info)
2113 {
2114 struct elf_i386_link_hash_table *htab;
2115 bfd *dynobj;
2116 asection *s;
2117 bfd_boolean relocs;
2118 bfd *ibfd;
2119
2120 htab = elf_i386_hash_table (info);
2121 dynobj = htab->elf.dynobj;
2122 if (dynobj == NULL)
2123 abort ();
2124
2125 if (htab->elf.dynamic_sections_created)
2126 {
2127 /* Set the contents of the .interp section to the interpreter. */
2128 if (info->executable)
2129 {
2130 s = bfd_get_section_by_name (dynobj, ".interp");
2131 if (s == NULL)
2132 abort ();
2133 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2134 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2135 }
2136 }
2137
2138 /* Set up .got offsets for local syms, and space for local dynamic
2139 relocs. */
2140 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2141 {
2142 bfd_signed_vma *local_got;
2143 bfd_signed_vma *end_local_got;
2144 char *local_tls_type;
2145 bfd_vma *local_tlsdesc_gotent;
2146 bfd_size_type locsymcount;
2147 Elf_Internal_Shdr *symtab_hdr;
2148 asection *srel;
2149
2150 if (! is_i386_elf (ibfd))
2151 continue;
2152
2153 for (s = ibfd->sections; s != NULL; s = s->next)
2154 {
2155 struct elf_i386_dyn_relocs *p;
2156
2157 for (p = ((struct elf_i386_dyn_relocs *)
2158 elf_section_data (s)->local_dynrel);
2159 p != NULL;
2160 p = p->next)
2161 {
2162 if (!bfd_is_abs_section (p->sec)
2163 && bfd_is_abs_section (p->sec->output_section))
2164 {
2165 /* Input section has been discarded, either because
2166 it is a copy of a linkonce section or due to
2167 linker script /DISCARD/, so we'll be discarding
2168 the relocs too. */
2169 }
2170 else if (htab->is_vxworks
2171 && strcmp (p->sec->output_section->name,
2172 ".tls_vars") == 0)
2173 {
2174 /* Relocations in vxworks .tls_vars sections are
2175 handled specially by the loader. */
2176 }
2177 else if (p->count != 0)
2178 {
2179 srel = elf_section_data (p->sec)->sreloc;
2180 srel->size += p->count * sizeof (Elf32_External_Rel);
2181 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2182 info->flags |= DF_TEXTREL;
2183 }
2184 }
2185 }
2186
2187 local_got = elf_local_got_refcounts (ibfd);
2188 if (!local_got)
2189 continue;
2190
2191 symtab_hdr = &elf_symtab_hdr (ibfd);
2192 locsymcount = symtab_hdr->sh_info;
2193 end_local_got = local_got + locsymcount;
2194 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2195 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2196 s = htab->sgot;
2197 srel = htab->srelgot;
2198 for (; local_got < end_local_got;
2199 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2200 {
2201 *local_tlsdesc_gotent = (bfd_vma) -1;
2202 if (*local_got > 0)
2203 {
2204 if (GOT_TLS_GDESC_P (*local_tls_type))
2205 {
2206 *local_tlsdesc_gotent = htab->sgotplt->size
2207 - elf_i386_compute_jump_table_size (htab);
2208 htab->sgotplt->size += 8;
2209 *local_got = (bfd_vma) -2;
2210 }
2211 if (! GOT_TLS_GDESC_P (*local_tls_type)
2212 || GOT_TLS_GD_P (*local_tls_type))
2213 {
2214 *local_got = s->size;
2215 s->size += 4;
2216 if (GOT_TLS_GD_P (*local_tls_type)
2217 || *local_tls_type == GOT_TLS_IE_BOTH)
2218 s->size += 4;
2219 }
2220 if (info->shared
2221 || GOT_TLS_GD_ANY_P (*local_tls_type)
2222 || (*local_tls_type & GOT_TLS_IE))
2223 {
2224 if (*local_tls_type == GOT_TLS_IE_BOTH)
2225 srel->size += 2 * sizeof (Elf32_External_Rel);
2226 else if (GOT_TLS_GD_P (*local_tls_type)
2227 || ! GOT_TLS_GDESC_P (*local_tls_type))
2228 srel->size += sizeof (Elf32_External_Rel);
2229 if (GOT_TLS_GDESC_P (*local_tls_type))
2230 htab->srelplt->size += sizeof (Elf32_External_Rel);
2231 }
2232 }
2233 else
2234 *local_got = (bfd_vma) -1;
2235 }
2236 }
2237
2238 if (htab->tls_ldm_got.refcount > 0)
2239 {
2240 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2241 relocs. */
2242 htab->tls_ldm_got.offset = htab->sgot->size;
2243 htab->sgot->size += 8;
2244 htab->srelgot->size += sizeof (Elf32_External_Rel);
2245 }
2246 else
2247 htab->tls_ldm_got.offset = -1;
2248
2249 /* Allocate global sym .plt and .got entries, and space for global
2250 sym dynamic relocs. */
2251 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2252
2253 /* For every jump slot reserved in the sgotplt, reloc_count is
2254 incremented. However, when we reserve space for TLS descriptors,
2255 it's not incremented, so in order to compute the space reserved
2256 for them, it suffices to multiply the reloc count by the jump
2257 slot size. */
2258 if (htab->srelplt)
2259 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2260
2261 /* We now have determined the sizes of the various dynamic sections.
2262 Allocate memory for them. */
2263 relocs = FALSE;
2264 for (s = dynobj->sections; s != NULL; s = s->next)
2265 {
2266 bfd_boolean strip_section = TRUE;
2267
2268 if ((s->flags & SEC_LINKER_CREATED) == 0)
2269 continue;
2270
2271 if (s == htab->splt
2272 || s == htab->sgot
2273 || s == htab->sgotplt
2274 || s == htab->sdynbss)
2275 {
2276 /* Strip this section if we don't need it; see the
2277 comment below. */
2278 /* We'd like to strip these sections if they aren't needed, but if
2279 we've exported dynamic symbols from them we must leave them.
2280 It's too late to tell BFD to get rid of the symbols. */
2281
2282 if (htab->elf.hplt != NULL)
2283 strip_section = FALSE;
2284 }
2285 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2286 {
2287 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
2288 relocs = TRUE;
2289
2290 /* We use the reloc_count field as a counter if we need
2291 to copy relocs into the output file. */
2292 s->reloc_count = 0;
2293 }
2294 else
2295 {
2296 /* It's not one of our sections, so don't allocate space. */
2297 continue;
2298 }
2299
2300 if (s->size == 0)
2301 {
2302 /* If we don't need this section, strip it from the
2303 output file. This is mostly to handle .rel.bss and
2304 .rel.plt. We must create both sections in
2305 create_dynamic_sections, because they must be created
2306 before the linker maps input sections to output
2307 sections. The linker does that before
2308 adjust_dynamic_symbol is called, and it is that
2309 function which decides whether anything needs to go
2310 into these sections. */
2311 if (strip_section)
2312 s->flags |= SEC_EXCLUDE;
2313 continue;
2314 }
2315
2316 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2317 continue;
2318
2319 /* Allocate memory for the section contents. We use bfd_zalloc
2320 here in case unused entries are not reclaimed before the
2321 section's contents are written out. This should not happen,
2322 but this way if it does, we get a R_386_NONE reloc instead
2323 of garbage. */
2324 s->contents = bfd_zalloc (dynobj, s->size);
2325 if (s->contents == NULL)
2326 return FALSE;
2327 }
2328
2329 if (htab->elf.dynamic_sections_created)
2330 {
2331 /* Add some entries to the .dynamic section. We fill in the
2332 values later, in elf_i386_finish_dynamic_sections, but we
2333 must add the entries now so that we get the correct size for
2334 the .dynamic section. The DT_DEBUG entry is filled in by the
2335 dynamic linker and used by the debugger. */
2336 #define add_dynamic_entry(TAG, VAL) \
2337 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2338
2339 if (info->executable)
2340 {
2341 if (!add_dynamic_entry (DT_DEBUG, 0))
2342 return FALSE;
2343 }
2344
2345 if (htab->splt->size != 0)
2346 {
2347 if (!add_dynamic_entry (DT_PLTGOT, 0)
2348 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2349 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2350 || !add_dynamic_entry (DT_JMPREL, 0))
2351 return FALSE;
2352 }
2353
2354 if (relocs)
2355 {
2356 if (!add_dynamic_entry (DT_REL, 0)
2357 || !add_dynamic_entry (DT_RELSZ, 0)
2358 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2359 return FALSE;
2360
2361 /* If any dynamic relocs apply to a read-only section,
2362 then we need a DT_TEXTREL entry. */
2363 if ((info->flags & DF_TEXTREL) == 0)
2364 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2365 (PTR) info);
2366
2367 if ((info->flags & DF_TEXTREL) != 0)
2368 {
2369 if (!add_dynamic_entry (DT_TEXTREL, 0))
2370 return FALSE;
2371 }
2372 }
2373 if (htab->is_vxworks
2374 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2375 return FALSE;
2376 }
2377 #undef add_dynamic_entry
2378
2379 return TRUE;
2380 }
2381
2382 static bfd_boolean
2383 elf_i386_always_size_sections (bfd *output_bfd,
2384 struct bfd_link_info *info)
2385 {
2386 asection *tls_sec = elf_hash_table (info)->tls_sec;
2387
2388 if (tls_sec)
2389 {
2390 struct elf_link_hash_entry *tlsbase;
2391
2392 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2393 "_TLS_MODULE_BASE_",
2394 FALSE, FALSE, FALSE);
2395
2396 if (tlsbase && tlsbase->type == STT_TLS)
2397 {
2398 struct bfd_link_hash_entry *bh = NULL;
2399 const struct elf_backend_data *bed
2400 = get_elf_backend_data (output_bfd);
2401
2402 if (!(_bfd_generic_link_add_one_symbol
2403 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2404 tls_sec, 0, NULL, FALSE,
2405 bed->collect, &bh)))
2406 return FALSE;
2407
2408 elf_i386_hash_table (info)->tls_module_base = bh;
2409
2410 tlsbase = (struct elf_link_hash_entry *)bh;
2411 tlsbase->def_regular = 1;
2412 tlsbase->other = STV_HIDDEN;
2413 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2414 }
2415 }
2416
2417 return TRUE;
2418 }
2419
2420 /* Set the correct type for an x86 ELF section. We do this by the
2421 section name, which is a hack, but ought to work. */
2422
2423 static bfd_boolean
2424 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2425 Elf_Internal_Shdr *hdr,
2426 asection *sec)
2427 {
2428 register const char *name;
2429
2430 name = bfd_get_section_name (abfd, sec);
2431
2432 /* This is an ugly, but unfortunately necessary hack that is
2433 needed when producing EFI binaries on x86. It tells
2434 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2435 containing ELF relocation info. We need this hack in order to
2436 be able to generate ELF binaries that can be translated into
2437 EFI applications (which are essentially COFF objects). Those
2438 files contain a COFF ".reloc" section inside an ELFNN object,
2439 which would normally cause BFD to segfault because it would
2440 attempt to interpret this section as containing relocation
2441 entries for section "oc". With this hack enabled, ".reloc"
2442 will be treated as a normal data section, which will avoid the
2443 segfault. However, you won't be able to create an ELFNN binary
2444 with a section named "oc" that needs relocations, but that's
2445 the kind of ugly side-effects you get when detecting section
2446 types based on their names... In practice, this limitation is
2447 unlikely to bite. */
2448 if (strcmp (name, ".reloc") == 0)
2449 hdr->sh_type = SHT_PROGBITS;
2450
2451 return TRUE;
2452 }
2453
2454 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2455 executables. Rather than setting it to the beginning of the TLS
2456 section, we have to set it to the end. This function may be called
2457 multiple times, it is idempotent. */
2458
2459 static void
2460 set_tls_module_base (struct bfd_link_info *info)
2461 {
2462 struct bfd_link_hash_entry *base;
2463
2464 if (!info->executable)
2465 return;
2466
2467 base = elf_i386_hash_table (info)->tls_module_base;
2468
2469 if (!base)
2470 return;
2471
2472 base->u.def.value = elf_hash_table (info)->tls_size;
2473 }
2474
2475 /* Return the base VMA address which should be subtracted from real addresses
2476 when resolving @dtpoff relocation.
2477 This is PT_TLS segment p_vaddr. */
2478
2479 static bfd_vma
2480 dtpoff_base (struct bfd_link_info *info)
2481 {
2482 /* If tls_sec is NULL, we should have signalled an error already. */
2483 if (elf_hash_table (info)->tls_sec == NULL)
2484 return 0;
2485 return elf_hash_table (info)->tls_sec->vma;
2486 }
2487
2488 /* Return the relocation value for @tpoff relocation
2489 if STT_TLS virtual address is ADDRESS. */
2490
2491 static bfd_vma
2492 tpoff (struct bfd_link_info *info, bfd_vma address)
2493 {
2494 struct elf_link_hash_table *htab = elf_hash_table (info);
2495
2496 /* If tls_sec is NULL, we should have signalled an error already. */
2497 if (htab->tls_sec == NULL)
2498 return 0;
2499 return htab->tls_size + htab->tls_sec->vma - address;
2500 }
2501
2502 /* Relocate an i386 ELF section. */
2503
2504 static bfd_boolean
2505 elf_i386_relocate_section (bfd *output_bfd,
2506 struct bfd_link_info *info,
2507 bfd *input_bfd,
2508 asection *input_section,
2509 bfd_byte *contents,
2510 Elf_Internal_Rela *relocs,
2511 Elf_Internal_Sym *local_syms,
2512 asection **local_sections)
2513 {
2514 struct elf_i386_link_hash_table *htab;
2515 Elf_Internal_Shdr *symtab_hdr;
2516 struct elf_link_hash_entry **sym_hashes;
2517 bfd_vma *local_got_offsets;
2518 bfd_vma *local_tlsdesc_gotents;
2519 Elf_Internal_Rela *rel;
2520 Elf_Internal_Rela *relend;
2521 bfd_boolean is_vxworks_tls;
2522
2523 BFD_ASSERT (is_i386_elf (input_bfd));
2524
2525 htab = elf_i386_hash_table (info);
2526 symtab_hdr = &elf_symtab_hdr (input_bfd);
2527 sym_hashes = elf_sym_hashes (input_bfd);
2528 local_got_offsets = elf_local_got_offsets (input_bfd);
2529 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2530 /* We have to handle relocations in vxworks .tls_vars sections
2531 specially, because the dynamic loader is 'weird'. */
2532 is_vxworks_tls = (htab->is_vxworks && info->shared
2533 && !strcmp (input_section->output_section->name,
2534 ".tls_vars"));
2535
2536 set_tls_module_base (info);
2537
2538 rel = relocs;
2539 relend = relocs + input_section->reloc_count;
2540 for (; rel < relend; rel++)
2541 {
2542 unsigned int r_type;
2543 reloc_howto_type *howto;
2544 unsigned long r_symndx;
2545 struct elf_link_hash_entry *h;
2546 Elf_Internal_Sym *sym;
2547 asection *sec;
2548 bfd_vma off, offplt;
2549 bfd_vma relocation;
2550 bfd_boolean unresolved_reloc;
2551 bfd_reloc_status_type r;
2552 unsigned int indx;
2553 int tls_type;
2554
2555 r_type = ELF32_R_TYPE (rel->r_info);
2556 if (r_type == R_386_GNU_VTINHERIT
2557 || r_type == R_386_GNU_VTENTRY)
2558 continue;
2559
2560 if ((indx = r_type) >= R_386_standard
2561 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2562 >= R_386_ext - R_386_standard)
2563 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2564 >= R_386_tls - R_386_ext))
2565 {
2566 (*_bfd_error_handler)
2567 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2568 input_bfd, input_section, r_type);
2569 bfd_set_error (bfd_error_bad_value);
2570 return FALSE;
2571 }
2572 howto = elf_howto_table + indx;
2573
2574 r_symndx = ELF32_R_SYM (rel->r_info);
2575 h = NULL;
2576 sym = NULL;
2577 sec = NULL;
2578 unresolved_reloc = FALSE;
2579 if (r_symndx < symtab_hdr->sh_info)
2580 {
2581 sym = local_syms + r_symndx;
2582 sec = local_sections[r_symndx];
2583 relocation = (sec->output_section->vma
2584 + sec->output_offset
2585 + sym->st_value);
2586
2587 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2588 && ((sec->flags & SEC_MERGE) != 0
2589 || (info->relocatable
2590 && sec->output_offset != 0)))
2591 {
2592 bfd_vma addend;
2593 bfd_byte *where = contents + rel->r_offset;
2594
2595 switch (howto->size)
2596 {
2597 case 0:
2598 addend = bfd_get_8 (input_bfd, where);
2599 if (howto->pc_relative)
2600 {
2601 addend = (addend ^ 0x80) - 0x80;
2602 addend += 1;
2603 }
2604 break;
2605 case 1:
2606 addend = bfd_get_16 (input_bfd, where);
2607 if (howto->pc_relative)
2608 {
2609 addend = (addend ^ 0x8000) - 0x8000;
2610 addend += 2;
2611 }
2612 break;
2613 case 2:
2614 addend = bfd_get_32 (input_bfd, where);
2615 if (howto->pc_relative)
2616 {
2617 addend = (addend ^ 0x80000000) - 0x80000000;
2618 addend += 4;
2619 }
2620 break;
2621 default:
2622 abort ();
2623 }
2624
2625 if (info->relocatable)
2626 addend += sec->output_offset;
2627 else
2628 {
2629 asection *msec = sec;
2630 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2631 addend);
2632 addend -= relocation;
2633 addend += msec->output_section->vma + msec->output_offset;
2634 }
2635
2636 switch (howto->size)
2637 {
2638 case 0:
2639 /* FIXME: overflow checks. */
2640 if (howto->pc_relative)
2641 addend -= 1;
2642 bfd_put_8 (input_bfd, addend, where);
2643 break;
2644 case 1:
2645 if (howto->pc_relative)
2646 addend -= 2;
2647 bfd_put_16 (input_bfd, addend, where);
2648 break;
2649 case 2:
2650 if (howto->pc_relative)
2651 addend -= 4;
2652 bfd_put_32 (input_bfd, addend, where);
2653 break;
2654 }
2655 }
2656 }
2657 else
2658 {
2659 bfd_boolean warned;
2660
2661 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2662 r_symndx, symtab_hdr, sym_hashes,
2663 h, sec, relocation,
2664 unresolved_reloc, warned);
2665 }
2666
2667 if (sec != NULL && elf_discarded_section (sec))
2668 {
2669 /* For relocs against symbols from removed linkonce sections,
2670 or sections discarded by a linker script, we just want the
2671 section contents zeroed. Avoid any special processing. */
2672 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2673 rel->r_info = 0;
2674 rel->r_addend = 0;
2675 continue;
2676 }
2677
2678 if (info->relocatable)
2679 continue;
2680
2681 switch (r_type)
2682 {
2683 case R_386_GOT32:
2684 /* Relocation is to the entry for this symbol in the global
2685 offset table. */
2686 if (htab->sgot == NULL)
2687 abort ();
2688
2689 if (h != NULL)
2690 {
2691 bfd_boolean dyn;
2692
2693 off = h->got.offset;
2694 dyn = htab->elf.dynamic_sections_created;
2695 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2696 || (info->shared
2697 && SYMBOL_REFERENCES_LOCAL (info, h))
2698 || (ELF_ST_VISIBILITY (h->other)
2699 && h->root.type == bfd_link_hash_undefweak))
2700 {
2701 /* This is actually a static link, or it is a
2702 -Bsymbolic link and the symbol is defined
2703 locally, or the symbol was forced to be local
2704 because of a version file. We must initialize
2705 this entry in the global offset table. Since the
2706 offset must always be a multiple of 4, we use the
2707 least significant bit to record whether we have
2708 initialized it already.
2709
2710 When doing a dynamic link, we create a .rel.got
2711 relocation entry to initialize the value. This
2712 is done in the finish_dynamic_symbol routine. */
2713 if ((off & 1) != 0)
2714 off &= ~1;
2715 else
2716 {
2717 bfd_put_32 (output_bfd, relocation,
2718 htab->sgot->contents + off);
2719 h->got.offset |= 1;
2720 }
2721 }
2722 else
2723 unresolved_reloc = FALSE;
2724 }
2725 else
2726 {
2727 if (local_got_offsets == NULL)
2728 abort ();
2729
2730 off = local_got_offsets[r_symndx];
2731
2732 /* The offset must always be a multiple of 4. We use
2733 the least significant bit to record whether we have
2734 already generated the necessary reloc. */
2735 if ((off & 1) != 0)
2736 off &= ~1;
2737 else
2738 {
2739 bfd_put_32 (output_bfd, relocation,
2740 htab->sgot->contents + off);
2741
2742 if (info->shared)
2743 {
2744 asection *s;
2745 Elf_Internal_Rela outrel;
2746 bfd_byte *loc;
2747
2748 s = htab->srelgot;
2749 if (s == NULL)
2750 abort ();
2751
2752 outrel.r_offset = (htab->sgot->output_section->vma
2753 + htab->sgot->output_offset
2754 + off);
2755 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2756 loc = s->contents;
2757 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2758 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2759 }
2760
2761 local_got_offsets[r_symndx] |= 1;
2762 }
2763 }
2764
2765 if (off >= (bfd_vma) -2)
2766 abort ();
2767
2768 relocation = htab->sgot->output_section->vma
2769 + htab->sgot->output_offset + off
2770 - htab->sgotplt->output_section->vma
2771 - htab->sgotplt->output_offset;
2772 break;
2773
2774 case R_386_GOTOFF:
2775 /* Relocation is relative to the start of the global offset
2776 table. */
2777
2778 /* Check to make sure it isn't a protected function symbol
2779 for shared library since it may not be local when used
2780 as function address. We also need to make sure that a
2781 symbol is defined locally. */
2782 if (info->shared && h)
2783 {
2784 if (!h->def_regular)
2785 {
2786 const char *v;
2787
2788 switch (ELF_ST_VISIBILITY (h->other))
2789 {
2790 case STV_HIDDEN:
2791 v = _("hidden symbol");
2792 break;
2793 case STV_INTERNAL:
2794 v = _("internal symbol");
2795 break;
2796 case STV_PROTECTED:
2797 v = _("protected symbol");
2798 break;
2799 default:
2800 v = _("symbol");
2801 break;
2802 }
2803
2804 (*_bfd_error_handler)
2805 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
2806 input_bfd, v, h->root.root.string);
2807 bfd_set_error (bfd_error_bad_value);
2808 return FALSE;
2809 }
2810 else if (!info->executable
2811 && h->type == STT_FUNC
2812 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2813 {
2814 (*_bfd_error_handler)
2815 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2816 input_bfd, h->root.root.string);
2817 bfd_set_error (bfd_error_bad_value);
2818 return FALSE;
2819 }
2820 }
2821
2822 /* Note that sgot is not involved in this
2823 calculation. We always want the start of .got.plt. If we
2824 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2825 permitted by the ABI, we might have to change this
2826 calculation. */
2827 relocation -= htab->sgotplt->output_section->vma
2828 + htab->sgotplt->output_offset;
2829 break;
2830
2831 case R_386_GOTPC:
2832 /* Use global offset table as symbol value. */
2833 relocation = htab->sgotplt->output_section->vma
2834 + htab->sgotplt->output_offset;
2835 unresolved_reloc = FALSE;
2836 break;
2837
2838 case R_386_PLT32:
2839 /* Relocation is to the entry for this symbol in the
2840 procedure linkage table. */
2841
2842 /* Resolve a PLT32 reloc against a local symbol directly,
2843 without using the procedure linkage table. */
2844 if (h == NULL)
2845 break;
2846
2847 if (h->plt.offset == (bfd_vma) -1
2848 || htab->splt == NULL)
2849 {
2850 /* We didn't make a PLT entry for this symbol. This
2851 happens when statically linking PIC code, or when
2852 using -Bsymbolic. */
2853 break;
2854 }
2855
2856 relocation = (htab->splt->output_section->vma
2857 + htab->splt->output_offset
2858 + h->plt.offset);
2859 unresolved_reloc = FALSE;
2860 break;
2861
2862 case R_386_32:
2863 case R_386_PC32:
2864 if ((input_section->flags & SEC_ALLOC) == 0
2865 || is_vxworks_tls)
2866 break;
2867
2868 if ((info->shared
2869 && (h == NULL
2870 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2871 || h->root.type != bfd_link_hash_undefweak)
2872 && (r_type != R_386_PC32
2873 || !SYMBOL_CALLS_LOCAL (info, h)))
2874 || (ELIMINATE_COPY_RELOCS
2875 && !info->shared
2876 && h != NULL
2877 && h->dynindx != -1
2878 && !h->non_got_ref
2879 && ((h->def_dynamic
2880 && !h->def_regular)
2881 || h->root.type == bfd_link_hash_undefweak
2882 || h->root.type == bfd_link_hash_undefined)))
2883 {
2884 Elf_Internal_Rela outrel;
2885 bfd_byte *loc;
2886 bfd_boolean skip, relocate;
2887 asection *sreloc;
2888
2889 /* When generating a shared object, these relocations
2890 are copied into the output file to be resolved at run
2891 time. */
2892
2893 skip = FALSE;
2894 relocate = FALSE;
2895
2896 outrel.r_offset =
2897 _bfd_elf_section_offset (output_bfd, info, input_section,
2898 rel->r_offset);
2899 if (outrel.r_offset == (bfd_vma) -1)
2900 skip = TRUE;
2901 else if (outrel.r_offset == (bfd_vma) -2)
2902 skip = TRUE, relocate = TRUE;
2903 outrel.r_offset += (input_section->output_section->vma
2904 + input_section->output_offset);
2905
2906 if (skip)
2907 memset (&outrel, 0, sizeof outrel);
2908 else if (h != NULL
2909 && h->dynindx != -1
2910 && (r_type == R_386_PC32
2911 || !info->shared
2912 || !SYMBOLIC_BIND (info, h)
2913 || !h->def_regular))
2914 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2915 else
2916 {
2917 /* This symbol is local, or marked to become local. */
2918 relocate = TRUE;
2919 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2920 }
2921
2922 sreloc = elf_section_data (input_section)->sreloc;
2923 if (sreloc == NULL)
2924 abort ();
2925
2926 loc = sreloc->contents;
2927 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2928 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2929
2930 /* If this reloc is against an external symbol, we do
2931 not want to fiddle with the addend. Otherwise, we
2932 need to include the symbol value so that it becomes
2933 an addend for the dynamic reloc. */
2934 if (! relocate)
2935 continue;
2936 }
2937 break;
2938
2939 case R_386_TLS_IE:
2940 if (info->shared)
2941 {
2942 Elf_Internal_Rela outrel;
2943 bfd_byte *loc;
2944 asection *sreloc;
2945
2946 outrel.r_offset = rel->r_offset
2947 + input_section->output_section->vma
2948 + input_section->output_offset;
2949 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2950 sreloc = elf_section_data (input_section)->sreloc;
2951 if (sreloc == NULL)
2952 abort ();
2953 loc = sreloc->contents;
2954 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2955 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2956 }
2957 /* Fall through */
2958
2959 case R_386_TLS_GD:
2960 case R_386_TLS_GOTDESC:
2961 case R_386_TLS_DESC_CALL:
2962 case R_386_TLS_IE_32:
2963 case R_386_TLS_GOTIE:
2964 tls_type = GOT_UNKNOWN;
2965 if (h == NULL && local_got_offsets)
2966 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2967 else if (h != NULL)
2968 tls_type = elf_i386_hash_entry(h)->tls_type;
2969 if (tls_type == GOT_TLS_IE)
2970 tls_type = GOT_TLS_IE_NEG;
2971
2972 if (! elf_i386_tls_transition (info, input_bfd,
2973 input_section, contents,
2974 symtab_hdr, sym_hashes,
2975 &r_type, tls_type, rel,
2976 relend, h))
2977 return FALSE;
2978
2979 if (r_type == R_386_TLS_LE_32)
2980 {
2981 BFD_ASSERT (! unresolved_reloc);
2982 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2983 {
2984 unsigned int type;
2985 bfd_vma roff;
2986
2987 /* GD->LE transition. */
2988 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2989 if (type == 0x04)
2990 {
2991 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2992 Change it into:
2993 movl %gs:0, %eax; subl $foo@tpoff, %eax
2994 (6 byte form of subl). */
2995 memcpy (contents + rel->r_offset - 3,
2996 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2997 roff = rel->r_offset + 5;
2998 }
2999 else
3000 {
3001 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3002 Change it into:
3003 movl %gs:0, %eax; subl $foo@tpoff, %eax
3004 (6 byte form of subl). */
3005 memcpy (contents + rel->r_offset - 2,
3006 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3007 roff = rel->r_offset + 6;
3008 }
3009 bfd_put_32 (output_bfd, tpoff (info, relocation),
3010 contents + roff);
3011 /* Skip R_386_PC32/R_386_PLT32. */
3012 rel++;
3013 continue;
3014 }
3015 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3016 {
3017 /* GDesc -> LE transition.
3018 It's originally something like:
3019 leal x@tlsdesc(%ebx), %eax
3020
3021 leal x@ntpoff, %eax
3022
3023 Registers other than %eax may be set up here. */
3024
3025 unsigned int val;
3026 bfd_vma roff;
3027
3028 roff = rel->r_offset;
3029 val = bfd_get_8 (input_bfd, contents + roff - 1);
3030
3031 /* Now modify the instruction as appropriate. */
3032 /* aoliva FIXME: remove the above and xor the byte
3033 below with 0x86. */
3034 bfd_put_8 (output_bfd, val ^ 0x86,
3035 contents + roff - 1);
3036 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3037 contents + roff);
3038 continue;
3039 }
3040 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3041 {
3042 /* GDesc -> LE transition.
3043 It's originally:
3044 call *(%eax)
3045 Turn it into:
3046 xchg %ax,%ax */
3047
3048 bfd_vma roff;
3049
3050 roff = rel->r_offset;
3051 bfd_put_8 (output_bfd, 0x66, contents + roff);
3052 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3053 continue;
3054 }
3055 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3056 {
3057 unsigned int val;
3058
3059 /* IE->LE transition:
3060 Originally it can be one of:
3061 movl foo, %eax
3062 movl foo, %reg
3063 addl foo, %reg
3064 We change it into:
3065 movl $foo, %eax
3066 movl $foo, %reg
3067 addl $foo, %reg. */
3068 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3069 if (val == 0xa1)
3070 {
3071 /* movl foo, %eax. */
3072 bfd_put_8 (output_bfd, 0xb8,
3073 contents + rel->r_offset - 1);
3074 }
3075 else
3076 {
3077 unsigned int type;
3078
3079 type = bfd_get_8 (input_bfd,
3080 contents + rel->r_offset - 2);
3081 switch (type)
3082 {
3083 case 0x8b:
3084 /* movl */
3085 bfd_put_8 (output_bfd, 0xc7,
3086 contents + rel->r_offset - 2);
3087 bfd_put_8 (output_bfd,
3088 0xc0 | ((val >> 3) & 7),
3089 contents + rel->r_offset - 1);
3090 break;
3091 case 0x03:
3092 /* addl */
3093 bfd_put_8 (output_bfd, 0x81,
3094 contents + rel->r_offset - 2);
3095 bfd_put_8 (output_bfd,
3096 0xc0 | ((val >> 3) & 7),
3097 contents + rel->r_offset - 1);
3098 break;
3099 default:
3100 BFD_FAIL ();
3101 break;
3102 }
3103 }
3104 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3105 contents + rel->r_offset);
3106 continue;
3107 }
3108 else
3109 {
3110 unsigned int val, type;
3111
3112 /* {IE_32,GOTIE}->LE transition:
3113 Originally it can be one of:
3114 subl foo(%reg1), %reg2
3115 movl foo(%reg1), %reg2
3116 addl foo(%reg1), %reg2
3117 We change it into:
3118 subl $foo, %reg2
3119 movl $foo, %reg2 (6 byte form)
3120 addl $foo, %reg2. */
3121 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3122 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3123 if (type == 0x8b)
3124 {
3125 /* movl */
3126 bfd_put_8 (output_bfd, 0xc7,
3127 contents + rel->r_offset - 2);
3128 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3129 contents + rel->r_offset - 1);
3130 }
3131 else if (type == 0x2b)
3132 {
3133 /* subl */
3134 bfd_put_8 (output_bfd, 0x81,
3135 contents + rel->r_offset - 2);
3136 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3137 contents + rel->r_offset - 1);
3138 }
3139 else if (type == 0x03)
3140 {
3141 /* addl */
3142 bfd_put_8 (output_bfd, 0x81,
3143 contents + rel->r_offset - 2);
3144 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3145 contents + rel->r_offset - 1);
3146 }
3147 else
3148 BFD_FAIL ();
3149 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3150 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3151 contents + rel->r_offset);
3152 else
3153 bfd_put_32 (output_bfd, tpoff (info, relocation),
3154 contents + rel->r_offset);
3155 continue;
3156 }
3157 }
3158
3159 if (htab->sgot == NULL)
3160 abort ();
3161
3162 if (h != NULL)
3163 {
3164 off = h->got.offset;
3165 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3166 }
3167 else
3168 {
3169 if (local_got_offsets == NULL)
3170 abort ();
3171
3172 off = local_got_offsets[r_symndx];
3173 offplt = local_tlsdesc_gotents[r_symndx];
3174 }
3175
3176 if ((off & 1) != 0)
3177 off &= ~1;
3178 else
3179 {
3180 Elf_Internal_Rela outrel;
3181 bfd_byte *loc;
3182 int dr_type, indx;
3183 asection *sreloc;
3184
3185 if (htab->srelgot == NULL)
3186 abort ();
3187
3188 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3189
3190 if (GOT_TLS_GDESC_P (tls_type))
3191 {
3192 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3193 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3194 <= htab->sgotplt->size);
3195 outrel.r_offset = (htab->sgotplt->output_section->vma
3196 + htab->sgotplt->output_offset
3197 + offplt
3198 + htab->sgotplt_jump_table_size);
3199 sreloc = htab->srelplt;
3200 loc = sreloc->contents;
3201 loc += (htab->next_tls_desc_index++
3202 * sizeof (Elf32_External_Rel));
3203 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3204 <= sreloc->contents + sreloc->size);
3205 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3206 if (indx == 0)
3207 {
3208 BFD_ASSERT (! unresolved_reloc);
3209 bfd_put_32 (output_bfd,
3210 relocation - dtpoff_base (info),
3211 htab->sgotplt->contents + offplt
3212 + htab->sgotplt_jump_table_size + 4);
3213 }
3214 else
3215 {
3216 bfd_put_32 (output_bfd, 0,
3217 htab->sgotplt->contents + offplt
3218 + htab->sgotplt_jump_table_size + 4);
3219 }
3220 }
3221
3222 sreloc = htab->srelgot;
3223
3224 outrel.r_offset = (htab->sgot->output_section->vma
3225 + htab->sgot->output_offset + off);
3226
3227 if (GOT_TLS_GD_P (tls_type))
3228 dr_type = R_386_TLS_DTPMOD32;
3229 else if (GOT_TLS_GDESC_P (tls_type))
3230 goto dr_done;
3231 else if (tls_type == GOT_TLS_IE_POS)
3232 dr_type = R_386_TLS_TPOFF;
3233 else
3234 dr_type = R_386_TLS_TPOFF32;
3235
3236 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3237 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
3238 htab->sgot->contents + off);
3239 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3240 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
3241 htab->sgot->contents + off);
3242 else if (dr_type != R_386_TLS_DESC)
3243 bfd_put_32 (output_bfd, 0,
3244 htab->sgot->contents + off);
3245 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3246
3247 loc = sreloc->contents;
3248 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3249 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3250 <= sreloc->contents + sreloc->size);
3251 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3252
3253 if (GOT_TLS_GD_P (tls_type))
3254 {
3255 if (indx == 0)
3256 {
3257 BFD_ASSERT (! unresolved_reloc);
3258 bfd_put_32 (output_bfd,
3259 relocation - dtpoff_base (info),
3260 htab->sgot->contents + off + 4);
3261 }
3262 else
3263 {
3264 bfd_put_32 (output_bfd, 0,
3265 htab->sgot->contents + off + 4);
3266 outrel.r_info = ELF32_R_INFO (indx,
3267 R_386_TLS_DTPOFF32);
3268 outrel.r_offset += 4;
3269 sreloc->reloc_count++;
3270 loc += sizeof (Elf32_External_Rel);
3271 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3272 <= sreloc->contents + sreloc->size);
3273 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3274 }
3275 }
3276 else if (tls_type == GOT_TLS_IE_BOTH)
3277 {
3278 bfd_put_32 (output_bfd,
3279 indx == 0 ? relocation - dtpoff_base (info) : 0,
3280 htab->sgot->contents + off + 4);
3281 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3282 outrel.r_offset += 4;
3283 sreloc->reloc_count++;
3284 loc += sizeof (Elf32_External_Rel);
3285 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3286 }
3287
3288 dr_done:
3289 if (h != NULL)
3290 h->got.offset |= 1;
3291 else
3292 local_got_offsets[r_symndx] |= 1;
3293 }
3294
3295 if (off >= (bfd_vma) -2
3296 && ! GOT_TLS_GDESC_P (tls_type))
3297 abort ();
3298 if (r_type == R_386_TLS_GOTDESC
3299 || r_type == R_386_TLS_DESC_CALL)
3300 {
3301 relocation = htab->sgotplt_jump_table_size + offplt;
3302 unresolved_reloc = FALSE;
3303 }
3304 else if (r_type == ELF32_R_TYPE (rel->r_info))
3305 {
3306 bfd_vma g_o_t = htab->sgotplt->output_section->vma
3307 + htab->sgotplt->output_offset;
3308 relocation = htab->sgot->output_section->vma
3309 + htab->sgot->output_offset + off - g_o_t;
3310 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3311 && tls_type == GOT_TLS_IE_BOTH)
3312 relocation += 4;
3313 if (r_type == R_386_TLS_IE)
3314 relocation += g_o_t;
3315 unresolved_reloc = FALSE;
3316 }
3317 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3318 {
3319 unsigned int val, type;
3320 bfd_vma roff;
3321
3322 /* GD->IE transition. */
3323 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3324 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3325 if (type == 0x04)
3326 {
3327 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3328 Change it into:
3329 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3330 val >>= 3;
3331 roff = rel->r_offset - 3;
3332 }
3333 else
3334 {
3335 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3336 Change it into:
3337 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3338 roff = rel->r_offset - 2;
3339 }
3340 memcpy (contents + roff,
3341 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3342 contents[roff + 7] = 0x80 | (val & 7);
3343 /* If foo is used only with foo@gotntpoff(%reg) and
3344 foo@indntpoff, but not with foo@gottpoff(%reg), change
3345 subl $foo@gottpoff(%reg), %eax
3346 into:
3347 addl $foo@gotntpoff(%reg), %eax. */
3348 if (tls_type == GOT_TLS_IE_POS)
3349 contents[roff + 6] = 0x03;
3350 bfd_put_32 (output_bfd,
3351 htab->sgot->output_section->vma
3352 + htab->sgot->output_offset + off
3353 - htab->sgotplt->output_section->vma
3354 - htab->sgotplt->output_offset,
3355 contents + roff + 8);
3356 /* Skip R_386_PLT32. */
3357 rel++;
3358 continue;
3359 }
3360 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3361 {
3362 /* GDesc -> IE transition.
3363 It's originally something like:
3364 leal x@tlsdesc(%ebx), %eax
3365
3366 Change it to:
3367 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3368 or:
3369 movl x@gottpoff(%ebx), %eax # before negl %eax
3370
3371 Registers other than %eax may be set up here. */
3372
3373 bfd_vma roff;
3374
3375 /* First, make sure it's a leal adding ebx to a 32-bit
3376 offset into any register, although it's probably
3377 almost always going to be eax. */
3378 roff = rel->r_offset;
3379
3380 /* Now modify the instruction as appropriate. */
3381 /* To turn a leal into a movl in the form we use it, it
3382 suffices to change the first byte from 0x8d to 0x8b.
3383 aoliva FIXME: should we decide to keep the leal, all
3384 we have to do is remove the statement below, and
3385 adjust the relaxation of R_386_TLS_DESC_CALL. */
3386 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3387
3388 if (tls_type == GOT_TLS_IE_BOTH)
3389 off += 4;
3390
3391 bfd_put_32 (output_bfd,
3392 htab->sgot->output_section->vma
3393 + htab->sgot->output_offset + off
3394 - htab->sgotplt->output_section->vma
3395 - htab->sgotplt->output_offset,
3396 contents + roff);
3397 continue;
3398 }
3399 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3400 {
3401 /* GDesc -> IE transition.
3402 It's originally:
3403 call *(%eax)
3404
3405 Change it to:
3406 xchg %ax,%ax
3407 or
3408 negl %eax
3409 depending on how we transformed the TLS_GOTDESC above.
3410 */
3411
3412 bfd_vma roff;
3413
3414 roff = rel->r_offset;
3415
3416 /* Now modify the instruction as appropriate. */
3417 if (tls_type != GOT_TLS_IE_NEG)
3418 {
3419 /* xchg %ax,%ax */
3420 bfd_put_8 (output_bfd, 0x66, contents + roff);
3421 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3422 }
3423 else
3424 {
3425 /* negl %eax */
3426 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3427 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3428 }
3429
3430 continue;
3431 }
3432 else
3433 BFD_ASSERT (FALSE);
3434 break;
3435
3436 case R_386_TLS_LDM:
3437 if (! elf_i386_tls_transition (info, input_bfd,
3438 input_section, contents,
3439 symtab_hdr, sym_hashes,
3440 &r_type, GOT_UNKNOWN, rel,
3441 relend, h))
3442 return FALSE;
3443
3444 if (r_type != R_386_TLS_LDM)
3445 {
3446 /* LD->LE transition:
3447 leal foo(%reg), %eax; call ___tls_get_addr.
3448 We change it into:
3449 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3450 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3451 memcpy (contents + rel->r_offset - 2,
3452 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3453 /* Skip R_386_PC32/R_386_PLT32. */
3454 rel++;
3455 continue;
3456 }
3457
3458 if (htab->sgot == NULL)
3459 abort ();
3460
3461 off = htab->tls_ldm_got.offset;
3462 if (off & 1)
3463 off &= ~1;
3464 else
3465 {
3466 Elf_Internal_Rela outrel;
3467 bfd_byte *loc;
3468
3469 if (htab->srelgot == NULL)
3470 abort ();
3471
3472 outrel.r_offset = (htab->sgot->output_section->vma
3473 + htab->sgot->output_offset + off);
3474
3475 bfd_put_32 (output_bfd, 0,
3476 htab->sgot->contents + off);
3477 bfd_put_32 (output_bfd, 0,
3478 htab->sgot->contents + off + 4);
3479 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3480 loc = htab->srelgot->contents;
3481 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3482 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3483 htab->tls_ldm_got.offset |= 1;
3484 }
3485 relocation = htab->sgot->output_section->vma
3486 + htab->sgot->output_offset + off
3487 - htab->sgotplt->output_section->vma
3488 - htab->sgotplt->output_offset;
3489 unresolved_reloc = FALSE;
3490 break;
3491
3492 case R_386_TLS_LDO_32:
3493 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3494 relocation -= dtpoff_base (info);
3495 else
3496 /* When converting LDO to LE, we must negate. */
3497 relocation = -tpoff (info, relocation);
3498 break;
3499
3500 case R_386_TLS_LE_32:
3501 case R_386_TLS_LE:
3502 if (info->shared)
3503 {
3504 Elf_Internal_Rela outrel;
3505 asection *sreloc;
3506 bfd_byte *loc;
3507 int indx;
3508
3509 outrel.r_offset = rel->r_offset
3510 + input_section->output_section->vma
3511 + input_section->output_offset;
3512 if (h != NULL && h->dynindx != -1)
3513 indx = h->dynindx;
3514 else
3515 indx = 0;
3516 if (r_type == R_386_TLS_LE_32)
3517 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3518 else
3519 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3520 sreloc = elf_section_data (input_section)->sreloc;
3521 if (sreloc == NULL)
3522 abort ();
3523 loc = sreloc->contents;
3524 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3525 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3526 if (indx)
3527 continue;
3528 else if (r_type == R_386_TLS_LE_32)
3529 relocation = dtpoff_base (info) - relocation;
3530 else
3531 relocation -= dtpoff_base (info);
3532 }
3533 else if (r_type == R_386_TLS_LE_32)
3534 relocation = tpoff (info, relocation);
3535 else
3536 relocation = -tpoff (info, relocation);
3537 break;
3538
3539 default:
3540 break;
3541 }
3542
3543 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3544 because such sections are not SEC_ALLOC and thus ld.so will
3545 not process them. */
3546 if (unresolved_reloc
3547 && !((input_section->flags & SEC_DEBUGGING) != 0
3548 && h->def_dynamic))
3549 {
3550 (*_bfd_error_handler)
3551 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3552 input_bfd,
3553 input_section,
3554 (long) rel->r_offset,
3555 howto->name,
3556 h->root.root.string);
3557 return FALSE;
3558 }
3559
3560 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3561 contents, rel->r_offset,
3562 relocation, 0);
3563
3564 if (r != bfd_reloc_ok)
3565 {
3566 const char *name;
3567
3568 if (h != NULL)
3569 name = h->root.root.string;
3570 else
3571 {
3572 name = bfd_elf_string_from_elf_section (input_bfd,
3573 symtab_hdr->sh_link,
3574 sym->st_name);
3575 if (name == NULL)
3576 return FALSE;
3577 if (*name == '\0')
3578 name = bfd_section_name (input_bfd, sec);
3579 }
3580
3581 if (r == bfd_reloc_overflow)
3582 {
3583 if (! ((*info->callbacks->reloc_overflow)
3584 (info, (h ? &h->root : NULL), name, howto->name,
3585 (bfd_vma) 0, input_bfd, input_section,
3586 rel->r_offset)))
3587 return FALSE;
3588 }
3589 else
3590 {
3591 (*_bfd_error_handler)
3592 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3593 input_bfd, input_section,
3594 (long) rel->r_offset, name, (int) r);
3595 return FALSE;
3596 }
3597 }
3598 }
3599
3600 return TRUE;
3601 }
3602
3603 /* Finish up dynamic symbol handling. We set the contents of various
3604 dynamic sections here. */
3605
3606 static bfd_boolean
3607 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3608 struct bfd_link_info *info,
3609 struct elf_link_hash_entry *h,
3610 Elf_Internal_Sym *sym)
3611 {
3612 struct elf_i386_link_hash_table *htab;
3613
3614 htab = elf_i386_hash_table (info);
3615
3616 if (h->plt.offset != (bfd_vma) -1)
3617 {
3618 bfd_vma plt_index;
3619 bfd_vma got_offset;
3620 Elf_Internal_Rela rel;
3621 bfd_byte *loc;
3622
3623 /* This symbol has an entry in the procedure linkage table. Set
3624 it up. */
3625
3626 if (h->dynindx == -1
3627 || htab->splt == NULL
3628 || htab->sgotplt == NULL
3629 || htab->srelplt == NULL)
3630 abort ();
3631
3632 /* Get the index in the procedure linkage table which
3633 corresponds to this symbol. This is the index of this symbol
3634 in all the symbols for which we are making plt entries. The
3635 first entry in the procedure linkage table is reserved. */
3636 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3637
3638 /* Get the offset into the .got table of the entry that
3639 corresponds to this function. Each .got entry is 4 bytes.
3640 The first three are reserved. */
3641 got_offset = (plt_index + 3) * 4;
3642
3643 /* Fill in the entry in the procedure linkage table. */
3644 if (! info->shared)
3645 {
3646 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3647 PLT_ENTRY_SIZE);
3648 bfd_put_32 (output_bfd,
3649 (htab->sgotplt->output_section->vma
3650 + htab->sgotplt->output_offset
3651 + got_offset),
3652 htab->splt->contents + h->plt.offset + 2);
3653
3654 if (htab->is_vxworks)
3655 {
3656 int s, k, reloc_index;
3657
3658 /* Create the R_386_32 relocation referencing the GOT
3659 for this PLT entry. */
3660
3661 /* S: Current slot number (zero-based). */
3662 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3663 /* K: Number of relocations for PLTResolve. */
3664 if (info->shared)
3665 k = PLTRESOLVE_RELOCS_SHLIB;
3666 else
3667 k = PLTRESOLVE_RELOCS;
3668 /* Skip the PLTresolve relocations, and the relocations for
3669 the other PLT slots. */
3670 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3671 loc = (htab->srelplt2->contents + reloc_index
3672 * sizeof (Elf32_External_Rel));
3673
3674 rel.r_offset = (htab->splt->output_section->vma
3675 + htab->splt->output_offset
3676 + h->plt.offset + 2),
3677 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3678 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3679
3680 /* Create the R_386_32 relocation referencing the beginning of
3681 the PLT for this GOT entry. */
3682 rel.r_offset = (htab->sgotplt->output_section->vma
3683 + htab->sgotplt->output_offset
3684 + got_offset);
3685 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3686 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3687 loc + sizeof (Elf32_External_Rel));
3688 }
3689 }
3690 else
3691 {
3692 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3693 PLT_ENTRY_SIZE);
3694 bfd_put_32 (output_bfd, got_offset,
3695 htab->splt->contents + h->plt.offset + 2);
3696 }
3697
3698 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3699 htab->splt->contents + h->plt.offset + 7);
3700 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3701 htab->splt->contents + h->plt.offset + 12);
3702
3703 /* Fill in the entry in the global offset table. */
3704 bfd_put_32 (output_bfd,
3705 (htab->splt->output_section->vma
3706 + htab->splt->output_offset
3707 + h->plt.offset
3708 + 6),
3709 htab->sgotplt->contents + got_offset);
3710
3711 /* Fill in the entry in the .rel.plt section. */
3712 rel.r_offset = (htab->sgotplt->output_section->vma
3713 + htab->sgotplt->output_offset
3714 + got_offset);
3715 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3716 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3717 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3718
3719 if (!h->def_regular)
3720 {
3721 /* Mark the symbol as undefined, rather than as defined in
3722 the .plt section. Leave the value if there were any
3723 relocations where pointer equality matters (this is a clue
3724 for the dynamic linker, to make function pointer
3725 comparisons work between an application and shared
3726 library), otherwise set it to zero. If a function is only
3727 called from a binary, there is no need to slow down
3728 shared libraries because of that. */
3729 sym->st_shndx = SHN_UNDEF;
3730 if (!h->pointer_equality_needed)
3731 sym->st_value = 0;
3732 }
3733 }
3734
3735 if (h->got.offset != (bfd_vma) -1
3736 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
3737 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3738 {
3739 Elf_Internal_Rela rel;
3740 bfd_byte *loc;
3741
3742 /* This symbol has an entry in the global offset table. Set it
3743 up. */
3744
3745 if (htab->sgot == NULL || htab->srelgot == NULL)
3746 abort ();
3747
3748 rel.r_offset = (htab->sgot->output_section->vma
3749 + htab->sgot->output_offset
3750 + (h->got.offset & ~(bfd_vma) 1));
3751
3752 /* If this is a static link, or it is a -Bsymbolic link and the
3753 symbol is defined locally or was forced to be local because
3754 of a version file, we just want to emit a RELATIVE reloc.
3755 The entry in the global offset table will already have been
3756 initialized in the relocate_section function. */
3757 if (info->shared
3758 && SYMBOL_REFERENCES_LOCAL (info, h))
3759 {
3760 BFD_ASSERT((h->got.offset & 1) != 0);
3761 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3762 }
3763 else
3764 {
3765 BFD_ASSERT((h->got.offset & 1) == 0);
3766 bfd_put_32 (output_bfd, (bfd_vma) 0,
3767 htab->sgot->contents + h->got.offset);
3768 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3769 }
3770
3771 loc = htab->srelgot->contents;
3772 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3773 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3774 }
3775
3776 if (h->needs_copy)
3777 {
3778 Elf_Internal_Rela rel;
3779 bfd_byte *loc;
3780
3781 /* This symbol needs a copy reloc. Set it up. */
3782
3783 if (h->dynindx == -1
3784 || (h->root.type != bfd_link_hash_defined
3785 && h->root.type != bfd_link_hash_defweak)
3786 || htab->srelbss == NULL)
3787 abort ();
3788
3789 rel.r_offset = (h->root.u.def.value
3790 + h->root.u.def.section->output_section->vma
3791 + h->root.u.def.section->output_offset);
3792 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3793 loc = htab->srelbss->contents;
3794 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3795 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3796 }
3797
3798 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3799 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3800 is relative to the ".got" section. */
3801 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3802 || (!htab->is_vxworks && h == htab->elf.hgot))
3803 sym->st_shndx = SHN_ABS;
3804
3805 return TRUE;
3806 }
3807
3808 /* Used to decide how to sort relocs in an optimal manner for the
3809 dynamic linker, before writing them out. */
3810
3811 static enum elf_reloc_type_class
3812 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3813 {
3814 switch (ELF32_R_TYPE (rela->r_info))
3815 {
3816 case R_386_RELATIVE:
3817 return reloc_class_relative;
3818 case R_386_JUMP_SLOT:
3819 return reloc_class_plt;
3820 case R_386_COPY:
3821 return reloc_class_copy;
3822 default:
3823 return reloc_class_normal;
3824 }
3825 }
3826
3827 /* Finish up the dynamic sections. */
3828
3829 static bfd_boolean
3830 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3831 struct bfd_link_info *info)
3832 {
3833 struct elf_i386_link_hash_table *htab;
3834 bfd *dynobj;
3835 asection *sdyn;
3836
3837 htab = elf_i386_hash_table (info);
3838 dynobj = htab->elf.dynobj;
3839 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3840
3841 if (htab->elf.dynamic_sections_created)
3842 {
3843 Elf32_External_Dyn *dyncon, *dynconend;
3844
3845 if (sdyn == NULL || htab->sgot == NULL)
3846 abort ();
3847
3848 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3849 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3850 for (; dyncon < dynconend; dyncon++)
3851 {
3852 Elf_Internal_Dyn dyn;
3853 asection *s;
3854
3855 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3856
3857 switch (dyn.d_tag)
3858 {
3859 default:
3860 if (htab->is_vxworks
3861 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
3862 break;
3863 continue;
3864
3865 case DT_PLTGOT:
3866 s = htab->sgotplt;
3867 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3868 break;
3869
3870 case DT_JMPREL:
3871 s = htab->srelplt;
3872 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3873 break;
3874
3875 case DT_PLTRELSZ:
3876 s = htab->srelplt;
3877 dyn.d_un.d_val = s->size;
3878 break;
3879
3880 case DT_RELSZ:
3881 /* My reading of the SVR4 ABI indicates that the
3882 procedure linkage table relocs (DT_JMPREL) should be
3883 included in the overall relocs (DT_REL). This is
3884 what Solaris does. However, UnixWare can not handle
3885 that case. Therefore, we override the DT_RELSZ entry
3886 here to make it not include the JMPREL relocs. */
3887 s = htab->srelplt;
3888 if (s == NULL)
3889 continue;
3890 dyn.d_un.d_val -= s->size;
3891 break;
3892
3893 case DT_REL:
3894 /* We may not be using the standard ELF linker script.
3895 If .rel.plt is the first .rel section, we adjust
3896 DT_REL to not include it. */
3897 s = htab->srelplt;
3898 if (s == NULL)
3899 continue;
3900 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3901 continue;
3902 dyn.d_un.d_ptr += s->size;
3903 break;
3904 }
3905
3906 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3907 }
3908
3909 /* Fill in the first entry in the procedure linkage table. */
3910 if (htab->splt && htab->splt->size > 0)
3911 {
3912 if (info->shared)
3913 {
3914 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3915 sizeof (elf_i386_pic_plt0_entry));
3916 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3917 htab->plt0_pad_byte,
3918 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3919 }
3920 else
3921 {
3922 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3923 sizeof(elf_i386_plt0_entry));
3924 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3925 htab->plt0_pad_byte,
3926 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3927 bfd_put_32 (output_bfd,
3928 (htab->sgotplt->output_section->vma
3929 + htab->sgotplt->output_offset
3930 + 4),
3931 htab->splt->contents + 2);
3932 bfd_put_32 (output_bfd,
3933 (htab->sgotplt->output_section->vma
3934 + htab->sgotplt->output_offset
3935 + 8),
3936 htab->splt->contents + 8);
3937
3938 if (htab->is_vxworks)
3939 {
3940 Elf_Internal_Rela rel;
3941
3942 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3943 On IA32 we use REL relocations so the addend goes in
3944 the PLT directly. */
3945 rel.r_offset = (htab->splt->output_section->vma
3946 + htab->splt->output_offset
3947 + 2);
3948 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3949 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3950 htab->srelplt2->contents);
3951 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3952 rel.r_offset = (htab->splt->output_section->vma
3953 + htab->splt->output_offset
3954 + 8);
3955 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3956 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3957 htab->srelplt2->contents +
3958 sizeof (Elf32_External_Rel));
3959 }
3960 }
3961
3962 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3963 really seem like the right value. */
3964 elf_section_data (htab->splt->output_section)
3965 ->this_hdr.sh_entsize = 4;
3966
3967 /* Correct the .rel.plt.unloaded relocations. */
3968 if (htab->is_vxworks && !info->shared)
3969 {
3970 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3971 unsigned char *p;
3972
3973 p = htab->srelplt2->contents;
3974 if (info->shared)
3975 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3976 else
3977 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3978
3979 for (; num_plts; num_plts--)
3980 {
3981 Elf_Internal_Rela rel;
3982 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3983 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3984 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3985 p += sizeof (Elf32_External_Rel);
3986
3987 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3988 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3989 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3990 p += sizeof (Elf32_External_Rel);
3991 }
3992 }
3993 }
3994 }
3995
3996 if (htab->sgotplt)
3997 {
3998 /* Fill in the first three entries in the global offset table. */
3999 if (htab->sgotplt->size > 0)
4000 {
4001 bfd_put_32 (output_bfd,
4002 (sdyn == NULL ? 0
4003 : sdyn->output_section->vma + sdyn->output_offset),
4004 htab->sgotplt->contents);
4005 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
4006 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
4007 }
4008
4009 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
4010 }
4011
4012 if (htab->sgot && htab->sgot->size > 0)
4013 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
4014
4015 return TRUE;
4016 }
4017
4018 /* Return address for Ith PLT stub in section PLT, for relocation REL
4019 or (bfd_vma) -1 if it should not be included. */
4020
4021 static bfd_vma
4022 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4023 const arelent *rel ATTRIBUTE_UNUSED)
4024 {
4025 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4026 }
4027
4028 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4029
4030 static bfd_boolean
4031 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4032 {
4033 if (h->plt.offset != (bfd_vma) -1
4034 && !h->def_regular
4035 && !h->pointer_equality_needed)
4036 return FALSE;
4037
4038 return _bfd_elf_hash_symbol (h);
4039 }
4040
4041 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4042 #define TARGET_LITTLE_NAME "elf32-i386"
4043 #define ELF_ARCH bfd_arch_i386
4044 #define ELF_MACHINE_CODE EM_386
4045 #define ELF_MAXPAGESIZE 0x1000
4046
4047 #define elf_backend_can_gc_sections 1
4048 #define elf_backend_can_refcount 1
4049 #define elf_backend_want_got_plt 1
4050 #define elf_backend_plt_readonly 1
4051 #define elf_backend_want_plt_sym 0
4052 #define elf_backend_got_header_size 12
4053
4054 /* Support RELA for objdump of prelink objects. */
4055 #define elf_info_to_howto elf_i386_info_to_howto_rel
4056 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4057
4058 #define bfd_elf32_mkobject elf_i386_mkobject
4059
4060 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4061 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4062 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4063 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4064
4065 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4066 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4067 #define elf_backend_check_relocs elf_i386_check_relocs
4068 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4069 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4070 #define elf_backend_fake_sections elf_i386_fake_sections
4071 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4072 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4073 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4074 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4075 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4076 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4077 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4078 #define elf_backend_relocate_section elf_i386_relocate_section
4079 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4080 #define elf_backend_always_size_sections elf_i386_always_size_sections
4081 #define elf_backend_omit_section_dynsym \
4082 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4083 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4084 #define elf_backend_hash_symbol elf_i386_hash_symbol
4085
4086 #include "elf32-target.h"
4087
4088 /* FreeBSD support. */
4089
4090 #undef TARGET_LITTLE_SYM
4091 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4092 #undef TARGET_LITTLE_NAME
4093 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4094 #undef ELF_OSABI
4095 #define ELF_OSABI ELFOSABI_FREEBSD
4096
4097 /* The kernel recognizes executables as valid only if they carry a
4098 "FreeBSD" label in the ELF header. So we put this label on all
4099 executables and (for simplicity) also all other object files. */
4100
4101 static void
4102 elf_i386_post_process_headers (bfd *abfd,
4103 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4104 {
4105 Elf_Internal_Ehdr *i_ehdrp;
4106
4107 i_ehdrp = elf_elfheader (abfd);
4108
4109 /* Put an ABI label supported by FreeBSD >= 4.1. */
4110 i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi;
4111 #ifdef OLD_FREEBSD_ABI_LABEL
4112 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4113 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4114 #endif
4115 }
4116
4117 #undef elf_backend_post_process_headers
4118 #define elf_backend_post_process_headers elf_i386_post_process_headers
4119 #undef elf32_bed
4120 #define elf32_bed elf32_i386_fbsd_bed
4121
4122 #include "elf32-target.h"
4123
4124 /* VxWorks support. */
4125
4126 #undef TARGET_LITTLE_SYM
4127 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4128 #undef TARGET_LITTLE_NAME
4129 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4130 #undef ELF_OSABI
4131
4132 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4133
4134 static struct bfd_link_hash_table *
4135 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4136 {
4137 struct bfd_link_hash_table *ret;
4138 struct elf_i386_link_hash_table *htab;
4139
4140 ret = elf_i386_link_hash_table_create (abfd);
4141 if (ret)
4142 {
4143 htab = (struct elf_i386_link_hash_table *) ret;
4144 htab->is_vxworks = 1;
4145 htab->plt0_pad_byte = 0x90;
4146 }
4147
4148 return ret;
4149 }
4150
4151
4152 #undef elf_backend_relocs_compatible
4153 #undef elf_backend_post_process_headers
4154 #undef bfd_elf32_bfd_link_hash_table_create
4155 #define bfd_elf32_bfd_link_hash_table_create \
4156 elf_i386_vxworks_link_hash_table_create
4157 #undef elf_backend_add_symbol_hook
4158 #define elf_backend_add_symbol_hook \
4159 elf_vxworks_add_symbol_hook
4160 #undef elf_backend_link_output_symbol_hook
4161 #define elf_backend_link_output_symbol_hook \
4162 elf_vxworks_link_output_symbol_hook
4163 #undef elf_backend_emit_relocs
4164 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4165 #undef elf_backend_final_write_processing
4166 #define elf_backend_final_write_processing \
4167 elf_vxworks_final_write_processing
4168
4169 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4170 define it. */
4171 #undef elf_backend_want_plt_sym
4172 #define elf_backend_want_plt_sym 1
4173
4174 #undef elf32_bed
4175 #define elf32_bed elf32_i386_vxworks_bed
4176
4177 #include "elf32-target.h"
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