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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 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 GD 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 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1011 may be versioned. */
1012 return (h != NULL
1013 && h->root.root.string != NULL
1014 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1015 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1016 && (strncmp (h->root.root.string, "___tls_get_addr",
1017 15) == 0));
1018
1019 case R_386_TLS_IE:
1020 /* Check transition from IE access model:
1021 movl foo@indntpoff(%rip), %eax
1022 movl foo@indntpoff(%rip), %reg
1023 addl foo@indntpoff(%rip), %reg
1024 */
1025
1026 if (offset < 1 || (offset + 4) > sec->size)
1027 return FALSE;
1028
1029 /* Check "movl foo@tpoff(%rip), %eax" first. */
1030 val = bfd_get_8 (abfd, contents + offset - 1);
1031 if (val == 0xa1)
1032 return TRUE;
1033
1034 if (offset < 2)
1035 return FALSE;
1036
1037 /* Check movl|addl foo@tpoff(%rip), %reg. */
1038 type = bfd_get_8 (abfd, contents + offset - 2);
1039 return ((type == 0x8b || type == 0x03)
1040 && (val & 0xc7) == 0x05);
1041
1042 case R_386_TLS_GOTIE:
1043 case R_386_TLS_IE_32:
1044 /* Check transition from {IE_32,GOTIE} access model:
1045 subl foo@{tpoff,gontoff}(%reg1), %reg2
1046 movl foo@{tpoff,gontoff}(%reg1), %reg2
1047 addl foo@{tpoff,gontoff}(%reg1), %reg2
1048 */
1049
1050 if (offset < 2 || (offset + 4) > sec->size)
1051 return FALSE;
1052
1053 val = bfd_get_8 (abfd, contents + offset - 1);
1054 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1055 return FALSE;
1056
1057 type = bfd_get_8 (abfd, contents + offset - 2);
1058 return type == 0x8b || type == 0x2b || type == 0x03;
1059
1060 case R_386_TLS_GOTDESC:
1061 /* Check transition from GDesc access model:
1062 leal x@tlsdesc(%ebx), %eax
1063
1064 Make sure it's a leal adding ebx to a 32-bit offset
1065 into any register, although it's probably almost always
1066 going to be eax. */
1067
1068 if (offset < 2 || (offset + 4) > sec->size)
1069 return FALSE;
1070
1071 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1072 return FALSE;
1073
1074 val = bfd_get_8 (abfd, contents + offset - 1);
1075 return (val & 0xc7) == 0x83;
1076
1077 case R_386_TLS_DESC_CALL:
1078 /* Check transition from GDesc access model:
1079 call *x@tlsdesc(%rax)
1080 */
1081 if (offset + 2 <= sec->size)
1082 {
1083 /* Make sure that it's a call *x@tlsdesc(%rax). */
1084 static i386_opcode16 call = { { 0xff, 0x10 } };
1085 return bfd_get_16 (abfd, contents + offset) == call.i;
1086 }
1087
1088 return FALSE;
1089
1090 default:
1091 abort ();
1092 }
1093 }
1094
1095 /* Return TRUE if the TLS access transition is OK or no transition
1096 will be performed. Update R_TYPE if there is a transition. */
1097
1098 static bfd_boolean
1099 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1100 asection *sec, bfd_byte *contents,
1101 Elf_Internal_Shdr *symtab_hdr,
1102 struct elf_link_hash_entry **sym_hashes,
1103 unsigned int *r_type, int tls_type,
1104 const Elf_Internal_Rela *rel,
1105 const Elf_Internal_Rela *relend,
1106 struct elf_link_hash_entry *h)
1107 {
1108 unsigned int from_type = *r_type;
1109 unsigned int to_type = from_type;
1110 bfd_boolean check = TRUE;
1111
1112 switch (from_type)
1113 {
1114 case R_386_TLS_GD:
1115 case R_386_TLS_GOTDESC:
1116 case R_386_TLS_DESC_CALL:
1117 case R_386_TLS_IE_32:
1118 case R_386_TLS_IE:
1119 case R_386_TLS_GOTIE:
1120 if (!info->shared)
1121 {
1122 if (h == NULL)
1123 to_type = R_386_TLS_LE_32;
1124 else if (from_type != R_386_TLS_IE
1125 && from_type != R_386_TLS_GOTIE)
1126 to_type = R_386_TLS_IE_32;
1127 }
1128
1129 /* When we are called from elf_i386_relocate_section, CONTENTS
1130 isn't NULL and there may be additional transitions based on
1131 TLS_TYPE. */
1132 if (contents != NULL)
1133 {
1134 unsigned int new_to_type = to_type;
1135
1136 if (!info->shared
1137 && h != NULL
1138 && h->dynindx == -1
1139 && (tls_type & GOT_TLS_IE))
1140 new_to_type = R_386_TLS_LE_32;
1141
1142 if (to_type == R_386_TLS_GD
1143 || to_type == R_386_TLS_GOTDESC
1144 || to_type == R_386_TLS_DESC_CALL)
1145 {
1146 if (tls_type == GOT_TLS_IE_POS)
1147 new_to_type = R_386_TLS_GOTIE;
1148 else if (tls_type & GOT_TLS_IE)
1149 new_to_type = R_386_TLS_IE_32;
1150 }
1151
1152 /* We checked the transition before when we were called from
1153 elf_i386_check_relocs. We only want to check the new
1154 transition which hasn't been checked before. */
1155 check = new_to_type != to_type && from_type == to_type;
1156 to_type = new_to_type;
1157 }
1158
1159 break;
1160
1161 case R_386_TLS_LDM:
1162 if (!info->shared)
1163 to_type = R_386_TLS_LE_32;
1164 break;
1165
1166 default:
1167 return TRUE;
1168 }
1169
1170 /* Return TRUE if there is no transition. */
1171 if (from_type == to_type)
1172 return TRUE;
1173
1174 /* Check if the transition can be performed. */
1175 if (check
1176 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1177 symtab_hdr, sym_hashes,
1178 from_type, rel, relend))
1179 {
1180 reloc_howto_type *from, *to;
1181
1182 from = elf_i386_rtype_to_howto (abfd, from_type);
1183 to = elf_i386_rtype_to_howto (abfd, to_type);
1184
1185 (*_bfd_error_handler)
1186 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1187 "in section `%A' failed"),
1188 abfd, sec, from->name, to->name,
1189 h ? h->root.root.string : "a local symbol",
1190 (unsigned long) rel->r_offset);
1191 bfd_set_error (bfd_error_bad_value);
1192 return FALSE;
1193 }
1194
1195 *r_type = to_type;
1196 return TRUE;
1197 }
1198
1199 /* Returns true if the hash entry refers to a symbol
1200 marked for indirect handling during reloc processing. */
1201
1202 static bfd_boolean
1203 is_indirect_symbol (bfd * abfd, struct elf_link_hash_entry * h)
1204 {
1205 const struct elf_backend_data * bed;
1206
1207 if (abfd == NULL || h == NULL)
1208 return FALSE;
1209
1210 bed = get_elf_backend_data (abfd);
1211
1212 return h->type == STT_GNU_IFUNC
1213 && (bed->elf_osabi == ELFOSABI_LINUX
1214 /* GNU/Linux is still using the default value 0. */
1215 || bed->elf_osabi == ELFOSABI_NONE);
1216 }
1217
1218 /* Look through the relocs for a section during the first phase, and
1219 calculate needed space in the global offset table, procedure linkage
1220 table, and dynamic reloc sections. */
1221
1222 static bfd_boolean
1223 elf_i386_check_relocs (bfd *abfd,
1224 struct bfd_link_info *info,
1225 asection *sec,
1226 const Elf_Internal_Rela *relocs)
1227 {
1228 struct elf_i386_link_hash_table *htab;
1229 Elf_Internal_Shdr *symtab_hdr;
1230 struct elf_link_hash_entry **sym_hashes;
1231 const Elf_Internal_Rela *rel;
1232 const Elf_Internal_Rela *rel_end;
1233 asection *sreloc;
1234
1235 if (info->relocatable)
1236 return TRUE;
1237
1238 BFD_ASSERT (is_i386_elf (abfd));
1239
1240 htab = elf_i386_hash_table (info);
1241 symtab_hdr = &elf_symtab_hdr (abfd);
1242 sym_hashes = elf_sym_hashes (abfd);
1243
1244 sreloc = NULL;
1245
1246 rel_end = relocs + sec->reloc_count;
1247 for (rel = relocs; rel < rel_end; rel++)
1248 {
1249 unsigned int r_type;
1250 unsigned long r_symndx;
1251 struct elf_link_hash_entry *h;
1252
1253 r_symndx = ELF32_R_SYM (rel->r_info);
1254 r_type = ELF32_R_TYPE (rel->r_info);
1255
1256 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1257 {
1258 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1259 abfd,
1260 r_symndx);
1261 return FALSE;
1262 }
1263
1264 if (r_symndx < symtab_hdr->sh_info)
1265 h = NULL;
1266 else
1267 {
1268 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1269 while (h->root.type == bfd_link_hash_indirect
1270 || h->root.type == bfd_link_hash_warning)
1271 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1272 }
1273
1274 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1275 symtab_hdr, sym_hashes,
1276 &r_type, GOT_UNKNOWN,
1277 rel, rel_end, h))
1278 return FALSE;
1279
1280 switch (r_type)
1281 {
1282 case R_386_TLS_LDM:
1283 htab->tls_ldm_got.refcount += 1;
1284 goto create_got;
1285
1286 case R_386_PLT32:
1287 /* This symbol requires a procedure linkage table entry. We
1288 actually build the entry in adjust_dynamic_symbol,
1289 because this might be a case of linking PIC code which is
1290 never referenced by a dynamic object, in which case we
1291 don't need to generate a procedure linkage table entry
1292 after all. */
1293
1294 /* If this is a local symbol, we resolve it directly without
1295 creating a procedure linkage table entry. */
1296 if (h == NULL)
1297 continue;
1298
1299 h->needs_plt = 1;
1300 h->plt.refcount += 1;
1301 break;
1302
1303 case R_386_TLS_IE_32:
1304 case R_386_TLS_IE:
1305 case R_386_TLS_GOTIE:
1306 if (info->shared)
1307 info->flags |= DF_STATIC_TLS;
1308 /* Fall through */
1309
1310 case R_386_GOT32:
1311 case R_386_TLS_GD:
1312 case R_386_TLS_GOTDESC:
1313 case R_386_TLS_DESC_CALL:
1314 /* This symbol requires a global offset table entry. */
1315 {
1316 int tls_type, old_tls_type;
1317
1318 switch (r_type)
1319 {
1320 default:
1321 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1322 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1323 case R_386_TLS_GOTDESC:
1324 case R_386_TLS_DESC_CALL:
1325 tls_type = GOT_TLS_GDESC; break;
1326 case R_386_TLS_IE_32:
1327 if (ELF32_R_TYPE (rel->r_info) == r_type)
1328 tls_type = GOT_TLS_IE_NEG;
1329 else
1330 /* If this is a GD->IE transition, we may use either of
1331 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1332 tls_type = GOT_TLS_IE;
1333 break;
1334 case R_386_TLS_IE:
1335 case R_386_TLS_GOTIE:
1336 tls_type = GOT_TLS_IE_POS; break;
1337 }
1338
1339 if (h != NULL)
1340 {
1341 h->got.refcount += 1;
1342 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1343 }
1344 else
1345 {
1346 bfd_signed_vma *local_got_refcounts;
1347
1348 /* This is a global offset table entry for a local symbol. */
1349 local_got_refcounts = elf_local_got_refcounts (abfd);
1350 if (local_got_refcounts == NULL)
1351 {
1352 bfd_size_type size;
1353
1354 size = symtab_hdr->sh_info;
1355 size *= (sizeof (bfd_signed_vma)
1356 + sizeof (bfd_vma) + sizeof(char));
1357 local_got_refcounts = bfd_zalloc (abfd, size);
1358 if (local_got_refcounts == NULL)
1359 return FALSE;
1360 elf_local_got_refcounts (abfd) = local_got_refcounts;
1361 elf_i386_local_tlsdesc_gotent (abfd)
1362 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1363 elf_i386_local_got_tls_type (abfd)
1364 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1365 }
1366 local_got_refcounts[r_symndx] += 1;
1367 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1368 }
1369
1370 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1371 tls_type |= old_tls_type;
1372 /* If a TLS symbol is accessed using IE at least once,
1373 there is no point to use dynamic model for it. */
1374 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1375 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1376 || (tls_type & GOT_TLS_IE) == 0))
1377 {
1378 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1379 tls_type = old_tls_type;
1380 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1381 && GOT_TLS_GD_ANY_P (tls_type))
1382 tls_type |= old_tls_type;
1383 else
1384 {
1385 (*_bfd_error_handler)
1386 (_("%B: `%s' accessed both as normal and "
1387 "thread local symbol"),
1388 abfd,
1389 h ? h->root.root.string : "<local>");
1390 return FALSE;
1391 }
1392 }
1393
1394 if (old_tls_type != tls_type)
1395 {
1396 if (h != NULL)
1397 elf_i386_hash_entry (h)->tls_type = tls_type;
1398 else
1399 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1400 }
1401 }
1402 /* Fall through */
1403
1404 case R_386_GOTOFF:
1405 case R_386_GOTPC:
1406 create_got:
1407 if (htab->sgot == NULL)
1408 {
1409 if (htab->elf.dynobj == NULL)
1410 htab->elf.dynobj = abfd;
1411 if (!create_got_section (htab->elf.dynobj, info))
1412 return FALSE;
1413 }
1414 if (r_type != R_386_TLS_IE)
1415 break;
1416 /* Fall through */
1417
1418 case R_386_TLS_LE_32:
1419 case R_386_TLS_LE:
1420 if (!info->shared)
1421 break;
1422 info->flags |= DF_STATIC_TLS;
1423 /* Fall through */
1424
1425 case R_386_32:
1426 case R_386_PC32:
1427 if (h != NULL && !info->shared)
1428 {
1429 /* If this reloc is in a read-only section, we might
1430 need a copy reloc. We can't check reliably at this
1431 stage whether the section is read-only, as input
1432 sections have not yet been mapped to output sections.
1433 Tentatively set the flag for now, and correct in
1434 adjust_dynamic_symbol. */
1435 h->non_got_ref = 1;
1436
1437 /* We may need a .plt entry if the function this reloc
1438 refers to is in a shared lib. */
1439 h->plt.refcount += 1;
1440 if (r_type != R_386_PC32)
1441 h->pointer_equality_needed = 1;
1442 }
1443
1444 /* If we are creating a shared library, and this is a reloc
1445 against a global symbol, or a non PC relative reloc
1446 against a local symbol, then we need to copy the reloc
1447 into the shared library. However, if we are linking with
1448 -Bsymbolic, we do not need to copy a reloc against a
1449 global symbol which is defined in an object we are
1450 including in the link (i.e., DEF_REGULAR is set). At
1451 this point we have not seen all the input files, so it is
1452 possible that DEF_REGULAR is not set now but will be set
1453 later (it is never cleared). In case of a weak definition,
1454 DEF_REGULAR may be cleared later by a strong definition in
1455 a shared library. We account for that possibility below by
1456 storing information in the relocs_copied field of the hash
1457 table entry. A similar situation occurs when creating
1458 shared libraries and symbol visibility changes render the
1459 symbol local.
1460
1461 If on the other hand, we are creating an executable, we
1462 may need to keep relocations for symbols satisfied by a
1463 dynamic library if we manage to avoid copy relocs for the
1464 symbol. */
1465 if ((info->shared
1466 && (sec->flags & SEC_ALLOC) != 0
1467 && (r_type != R_386_PC32
1468 || (h != NULL
1469 && (! SYMBOLIC_BIND (info, h)
1470 || h->root.type == bfd_link_hash_defweak
1471 || !h->def_regular))))
1472 || (ELIMINATE_COPY_RELOCS
1473 && !info->shared
1474 && (sec->flags & SEC_ALLOC) != 0
1475 && h != NULL
1476 && (h->root.type == bfd_link_hash_defweak
1477 || !h->def_regular)))
1478 {
1479 struct elf_i386_dyn_relocs *p;
1480 struct elf_i386_dyn_relocs **head;
1481
1482 /* We must copy these reloc types into the output file.
1483 Create a reloc section in dynobj and make room for
1484 this reloc. */
1485 if (sreloc == NULL)
1486 {
1487 if (htab->elf.dynobj == NULL)
1488 htab->elf.dynobj = abfd;
1489
1490 sreloc = _bfd_elf_make_dynamic_reloc_section
1491 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1492
1493 if (sreloc == NULL)
1494 return FALSE;
1495
1496 /* Create the ifunc section as well, even if we have not encountered a
1497 indirect function symbol yet. We may not even see one in the input
1498 object file, but we can still encounter them in libraries. */
1499 (void) _bfd_elf_make_ifunc_reloc_section
1500 (abfd, sec, htab->elf.dynobj, 2);
1501 }
1502
1503 /* If this is a global symbol, we count the number of
1504 relocations we need for this symbol. */
1505 if (h != NULL)
1506 {
1507 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1508 }
1509 else
1510 {
1511 void **vpp;
1512 /* Track dynamic relocs needed for local syms too.
1513 We really need local syms available to do this
1514 easily. Oh well. */
1515
1516 asection *s;
1517 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1518 sec, r_symndx);
1519 if (s == NULL)
1520 return FALSE;
1521
1522 vpp = &elf_section_data (s)->local_dynrel;
1523 head = (struct elf_i386_dyn_relocs **)vpp;
1524 }
1525
1526 p = *head;
1527 if (p == NULL || p->sec != sec)
1528 {
1529 bfd_size_type amt = sizeof *p;
1530 p = bfd_alloc (htab->elf.dynobj, amt);
1531 if (p == NULL)
1532 return FALSE;
1533 p->next = *head;
1534 *head = p;
1535 p->sec = sec;
1536 p->count = 0;
1537 p->pc_count = 0;
1538 }
1539
1540 p->count += 1;
1541 if (r_type == R_386_PC32)
1542 p->pc_count += 1;
1543 }
1544 break;
1545
1546 /* This relocation describes the C++ object vtable hierarchy.
1547 Reconstruct it for later use during GC. */
1548 case R_386_GNU_VTINHERIT:
1549 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1550 return FALSE;
1551 break;
1552
1553 /* This relocation describes which C++ vtable entries are actually
1554 used. Record for later use during GC. */
1555 case R_386_GNU_VTENTRY:
1556 BFD_ASSERT (h != NULL);
1557 if (h != NULL
1558 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1559 return FALSE;
1560 break;
1561
1562 default:
1563 break;
1564 }
1565 }
1566
1567 return TRUE;
1568 }
1569
1570 /* Return the section that should be marked against GC for a given
1571 relocation. */
1572
1573 static asection *
1574 elf_i386_gc_mark_hook (asection *sec,
1575 struct bfd_link_info *info,
1576 Elf_Internal_Rela *rel,
1577 struct elf_link_hash_entry *h,
1578 Elf_Internal_Sym *sym)
1579 {
1580 if (h != NULL)
1581 switch (ELF32_R_TYPE (rel->r_info))
1582 {
1583 case R_386_GNU_VTINHERIT:
1584 case R_386_GNU_VTENTRY:
1585 return NULL;
1586 }
1587
1588 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1589 }
1590
1591 /* Update the got entry reference counts for the section being removed. */
1592
1593 static bfd_boolean
1594 elf_i386_gc_sweep_hook (bfd *abfd,
1595 struct bfd_link_info *info,
1596 asection *sec,
1597 const Elf_Internal_Rela *relocs)
1598 {
1599 Elf_Internal_Shdr *symtab_hdr;
1600 struct elf_link_hash_entry **sym_hashes;
1601 bfd_signed_vma *local_got_refcounts;
1602 const Elf_Internal_Rela *rel, *relend;
1603
1604 if (info->relocatable)
1605 return TRUE;
1606
1607 elf_section_data (sec)->local_dynrel = NULL;
1608
1609 symtab_hdr = &elf_symtab_hdr (abfd);
1610 sym_hashes = elf_sym_hashes (abfd);
1611 local_got_refcounts = elf_local_got_refcounts (abfd);
1612
1613 relend = relocs + sec->reloc_count;
1614 for (rel = relocs; rel < relend; rel++)
1615 {
1616 unsigned long r_symndx;
1617 unsigned int r_type;
1618 struct elf_link_hash_entry *h = NULL;
1619
1620 r_symndx = ELF32_R_SYM (rel->r_info);
1621 if (r_symndx >= symtab_hdr->sh_info)
1622 {
1623 struct elf_i386_link_hash_entry *eh;
1624 struct elf_i386_dyn_relocs **pp;
1625 struct elf_i386_dyn_relocs *p;
1626
1627 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1628 while (h->root.type == bfd_link_hash_indirect
1629 || h->root.type == bfd_link_hash_warning)
1630 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1631 eh = (struct elf_i386_link_hash_entry *) h;
1632
1633 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1634 if (p->sec == sec)
1635 {
1636 /* Everything must go for SEC. */
1637 *pp = p->next;
1638 break;
1639 }
1640 }
1641
1642 r_type = ELF32_R_TYPE (rel->r_info);
1643 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1644 symtab_hdr, sym_hashes,
1645 &r_type, GOT_UNKNOWN,
1646 rel, relend, h))
1647 return FALSE;
1648
1649 switch (r_type)
1650 {
1651 case R_386_TLS_LDM:
1652 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1653 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1654 break;
1655
1656 case R_386_TLS_GD:
1657 case R_386_TLS_GOTDESC:
1658 case R_386_TLS_DESC_CALL:
1659 case R_386_TLS_IE_32:
1660 case R_386_TLS_IE:
1661 case R_386_TLS_GOTIE:
1662 case R_386_GOT32:
1663 if (h != NULL)
1664 {
1665 if (h->got.refcount > 0)
1666 h->got.refcount -= 1;
1667 }
1668 else if (local_got_refcounts != NULL)
1669 {
1670 if (local_got_refcounts[r_symndx] > 0)
1671 local_got_refcounts[r_symndx] -= 1;
1672 }
1673 break;
1674
1675 case R_386_32:
1676 case R_386_PC32:
1677 if (info->shared)
1678 break;
1679 /* Fall through */
1680
1681 case R_386_PLT32:
1682 if (h != NULL)
1683 {
1684 if (h->plt.refcount > 0)
1685 h->plt.refcount -= 1;
1686 }
1687 break;
1688
1689 default:
1690 break;
1691 }
1692 }
1693
1694 return TRUE;
1695 }
1696
1697 /* Adjust a symbol defined by a dynamic object and referenced by a
1698 regular object. The current definition is in some section of the
1699 dynamic object, but we're not including those sections. We have to
1700 change the definition to something the rest of the link can
1701 understand. */
1702
1703 static bfd_boolean
1704 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1705 struct elf_link_hash_entry *h)
1706 {
1707 struct elf_i386_link_hash_table *htab;
1708 asection *s;
1709
1710 /* If this is a function, put it in the procedure linkage table. We
1711 will fill in the contents of the procedure linkage table later,
1712 when we know the address of the .got section. */
1713 if (h->type == STT_FUNC
1714 || h->needs_plt)
1715 {
1716 if (h->plt.refcount <= 0
1717 || SYMBOL_CALLS_LOCAL (info, h)
1718 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1719 && h->root.type == bfd_link_hash_undefweak))
1720 {
1721 /* This case can occur if we saw a PLT32 reloc in an input
1722 file, but the symbol was never referred to by a dynamic
1723 object, or if all references were garbage collected. In
1724 such a case, we don't actually need to build a procedure
1725 linkage table, and we can just do a PC32 reloc instead. */
1726 h->plt.offset = (bfd_vma) -1;
1727 h->needs_plt = 0;
1728 }
1729
1730 return TRUE;
1731 }
1732 else
1733 /* It's possible that we incorrectly decided a .plt reloc was
1734 needed for an R_386_PC32 reloc to a non-function sym in
1735 check_relocs. We can't decide accurately between function and
1736 non-function syms in check-relocs; Objects loaded later in
1737 the link may change h->type. So fix it now. */
1738 h->plt.offset = (bfd_vma) -1;
1739
1740 /* If this is a weak symbol, and there is a real definition, the
1741 processor independent code will have arranged for us to see the
1742 real definition first, and we can just use the same value. */
1743 if (h->u.weakdef != NULL)
1744 {
1745 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1746 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1747 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1748 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1749 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1750 h->non_got_ref = h->u.weakdef->non_got_ref;
1751 return TRUE;
1752 }
1753
1754 /* This is a reference to a symbol defined by a dynamic object which
1755 is not a function. */
1756
1757 /* If we are creating a shared library, we must presume that the
1758 only references to the symbol are via the global offset table.
1759 For such cases we need not do anything here; the relocations will
1760 be handled correctly by relocate_section. */
1761 if (info->shared)
1762 return TRUE;
1763
1764 /* If there are no references to this symbol that do not use the
1765 GOT, we don't need to generate a copy reloc. */
1766 if (!h->non_got_ref)
1767 return TRUE;
1768
1769 /* If -z nocopyreloc was given, we won't generate them either. */
1770 if (info->nocopyreloc)
1771 {
1772 h->non_got_ref = 0;
1773 return TRUE;
1774 }
1775
1776 htab = elf_i386_hash_table (info);
1777
1778 /* If there aren't any dynamic relocs in read-only sections, then
1779 we can keep the dynamic relocs and avoid the copy reloc. This
1780 doesn't work on VxWorks, where we can not have dynamic relocations
1781 (other than copy and jump slot relocations) in an executable. */
1782 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1783 {
1784 struct elf_i386_link_hash_entry * eh;
1785 struct elf_i386_dyn_relocs *p;
1786
1787 eh = (struct elf_i386_link_hash_entry *) h;
1788 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1789 {
1790 s = p->sec->output_section;
1791 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1792 break;
1793 }
1794
1795 if (p == NULL)
1796 {
1797 h->non_got_ref = 0;
1798 return TRUE;
1799 }
1800 }
1801
1802 if (h->size == 0)
1803 {
1804 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1805 h->root.root.string);
1806 return TRUE;
1807 }
1808
1809 /* We must allocate the symbol in our .dynbss section, which will
1810 become part of the .bss section of the executable. There will be
1811 an entry for this symbol in the .dynsym section. The dynamic
1812 object will contain position independent code, so all references
1813 from the dynamic object to this symbol will go through the global
1814 offset table. The dynamic linker will use the .dynsym entry to
1815 determine the address it must put in the global offset table, so
1816 both the dynamic object and the regular object will refer to the
1817 same memory location for the variable. */
1818
1819 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1820 copy the initial value out of the dynamic object and into the
1821 runtime process image. */
1822 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1823 {
1824 htab->srelbss->size += sizeof (Elf32_External_Rel);
1825 h->needs_copy = 1;
1826 }
1827
1828 s = htab->sdynbss;
1829
1830 return _bfd_elf_adjust_dynamic_copy (h, s);
1831 }
1832
1833 /* Allocate space in .plt, .got and associated reloc sections for
1834 dynamic relocs. */
1835
1836 static bfd_boolean
1837 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1838 {
1839 struct bfd_link_info *info;
1840 struct elf_i386_link_hash_table *htab;
1841 struct elf_i386_link_hash_entry *eh;
1842 struct elf_i386_dyn_relocs *p;
1843 bfd_boolean use_indirect_section = FALSE;
1844
1845 if (h->root.type == bfd_link_hash_indirect)
1846 return TRUE;
1847
1848 if (h->root.type == bfd_link_hash_warning)
1849 /* When warning symbols are created, they **replace** the "real"
1850 entry in the hash table, thus we never get to see the real
1851 symbol in a hash traversal. So look at it now. */
1852 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1853
1854 info = (struct bfd_link_info *) inf;
1855 htab = elf_i386_hash_table (info);
1856
1857 if (htab->elf.dynamic_sections_created
1858 && h->plt.refcount > 0)
1859 {
1860 /* Make sure this symbol is output as a dynamic symbol.
1861 Undefined weak syms won't yet be marked as dynamic. */
1862 if (h->dynindx == -1
1863 && !h->forced_local)
1864 {
1865 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1866 return FALSE;
1867 }
1868
1869 if (info->shared
1870 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1871 {
1872 asection *s = htab->splt;
1873
1874 /* If this is the first .plt entry, make room for the special
1875 first entry. */
1876 if (s->size == 0)
1877 s->size += PLT_ENTRY_SIZE;
1878
1879 h->plt.offset = s->size;
1880
1881 /* If this symbol is not defined in a regular file, and we are
1882 not generating a shared library, then set the symbol to this
1883 location in the .plt. This is required to make function
1884 pointers compare as equal between the normal executable and
1885 the shared library. */
1886 if (! info->shared
1887 && !h->def_regular)
1888 {
1889 h->root.u.def.section = s;
1890 h->root.u.def.value = h->plt.offset;
1891 }
1892
1893 /* Make room for this entry. */
1894 s->size += PLT_ENTRY_SIZE;
1895
1896 /* We also need to make an entry in the .got.plt section, which
1897 will be placed in the .got section by the linker script. */
1898 htab->sgotplt->size += 4;
1899
1900 /* We also need to make an entry in the .rel.plt section. */
1901 htab->srelplt->size += sizeof (Elf32_External_Rel);
1902 htab->next_tls_desc_index++;
1903
1904 if (htab->is_vxworks && !info->shared)
1905 {
1906 /* VxWorks has a second set of relocations for each PLT entry
1907 in executables. They go in a separate relocation section,
1908 which is processed by the kernel loader. */
1909
1910 /* There are two relocations for the initial PLT entry: an
1911 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1912 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1913
1914 if (h->plt.offset == PLT_ENTRY_SIZE)
1915 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1916
1917 /* There are two extra relocations for each subsequent PLT entry:
1918 an R_386_32 relocation for the GOT entry, and an R_386_32
1919 relocation for the PLT entry. */
1920
1921 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1922 }
1923 }
1924 else
1925 {
1926 h->plt.offset = (bfd_vma) -1;
1927 h->needs_plt = 0;
1928 }
1929 }
1930 else
1931 {
1932 h->plt.offset = (bfd_vma) -1;
1933 h->needs_plt = 0;
1934 }
1935
1936 eh = (struct elf_i386_link_hash_entry *) h;
1937 eh->tlsdesc_got = (bfd_vma) -1;
1938
1939 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1940 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1941 if (h->got.refcount > 0
1942 && !info->shared
1943 && h->dynindx == -1
1944 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1945 h->got.offset = (bfd_vma) -1;
1946 else if (h->got.refcount > 0)
1947 {
1948 asection *s;
1949 bfd_boolean dyn;
1950 int tls_type = elf_i386_hash_entry(h)->tls_type;
1951
1952 /* Make sure this symbol is output as a dynamic symbol.
1953 Undefined weak syms won't yet be marked as dynamic. */
1954 if (h->dynindx == -1
1955 && !h->forced_local)
1956 {
1957 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1958 return FALSE;
1959 }
1960
1961 s = htab->sgot;
1962 if (GOT_TLS_GDESC_P (tls_type))
1963 {
1964 eh->tlsdesc_got = htab->sgotplt->size
1965 - elf_i386_compute_jump_table_size (htab);
1966 htab->sgotplt->size += 8;
1967 h->got.offset = (bfd_vma) -2;
1968 }
1969 if (! GOT_TLS_GDESC_P (tls_type)
1970 || GOT_TLS_GD_P (tls_type))
1971 {
1972 h->got.offset = s->size;
1973 s->size += 4;
1974 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1975 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
1976 s->size += 4;
1977 }
1978 dyn = htab->elf.dynamic_sections_created;
1979 /* R_386_TLS_IE_32 needs one dynamic relocation,
1980 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1981 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1982 need two), R_386_TLS_GD needs one if local symbol and two if
1983 global. */
1984 if (tls_type == GOT_TLS_IE_BOTH)
1985 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1986 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1987 || (tls_type & GOT_TLS_IE))
1988 htab->srelgot->size += sizeof (Elf32_External_Rel);
1989 else if (GOT_TLS_GD_P (tls_type))
1990 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1991 else if (! GOT_TLS_GDESC_P (tls_type)
1992 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1993 || h->root.type != bfd_link_hash_undefweak)
1994 && (info->shared
1995 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1996 htab->srelgot->size += sizeof (Elf32_External_Rel);
1997 if (GOT_TLS_GDESC_P (tls_type))
1998 htab->srelplt->size += sizeof (Elf32_External_Rel);
1999 }
2000 else
2001 h->got.offset = (bfd_vma) -1;
2002
2003 if (eh->dyn_relocs == NULL)
2004 return TRUE;
2005
2006 /* In the shared -Bsymbolic case, discard space allocated for
2007 dynamic pc-relative relocs against symbols which turn out to be
2008 defined in regular objects. For the normal shared case, discard
2009 space for pc-relative relocs that have become local due to symbol
2010 visibility changes. */
2011
2012 if (info->shared)
2013 {
2014 /* The only reloc that uses pc_count is R_386_PC32, which will
2015 appear on a call or on something like ".long foo - .". We
2016 want calls to protected symbols to resolve directly to the
2017 function rather than going via the plt. If people want
2018 function pointer comparisons to work as expected then they
2019 should avoid writing assembly like ".long foo - .". */
2020 if (SYMBOL_CALLS_LOCAL (info, h))
2021 {
2022 struct elf_i386_dyn_relocs **pp;
2023
2024 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2025 {
2026 p->count -= p->pc_count;
2027 p->pc_count = 0;
2028 if (p->count == 0)
2029 *pp = p->next;
2030 else
2031 pp = &p->next;
2032 }
2033 }
2034
2035 if (htab->is_vxworks)
2036 {
2037 struct elf_i386_dyn_relocs **pp;
2038 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2039 {
2040 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2041 *pp = p->next;
2042 else
2043 pp = &p->next;
2044 }
2045 }
2046
2047 /* Also discard relocs on undefined weak syms with non-default
2048 visibility. */
2049 if (eh->dyn_relocs != NULL
2050 && h->root.type == bfd_link_hash_undefweak)
2051 {
2052 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2053 eh->dyn_relocs = NULL;
2054
2055 /* Make sure undefined weak symbols are output as a dynamic
2056 symbol in PIEs. */
2057 else if (h->dynindx == -1
2058 && !h->forced_local)
2059 {
2060 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2061 return FALSE;
2062 }
2063 }
2064 }
2065 else if (is_indirect_symbol (info->output_bfd, h)
2066 && h->dynindx == -1
2067 && ! h->forced_local)
2068 {
2069 if (bfd_elf_link_record_dynamic_symbol (info, h)
2070 && h->dynindx != -1)
2071 use_indirect_section = TRUE;
2072 else
2073 return FALSE;
2074 }
2075 else if (ELIMINATE_COPY_RELOCS)
2076 {
2077 /* For the non-shared case, discard space for relocs against
2078 symbols which turn out to need copy relocs or are not
2079 dynamic. */
2080
2081 if (!h->non_got_ref
2082 && ((h->def_dynamic
2083 && !h->def_regular)
2084 || (htab->elf.dynamic_sections_created
2085 && (h->root.type == bfd_link_hash_undefweak
2086 || h->root.type == bfd_link_hash_undefined))))
2087 {
2088 /* Make sure this symbol is output as a dynamic symbol.
2089 Undefined weak syms won't yet be marked as dynamic. */
2090 if (h->dynindx == -1
2091 && !h->forced_local)
2092 {
2093 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2094 return FALSE;
2095 }
2096
2097 /* If that succeeded, we know we'll be keeping all the
2098 relocs. */
2099 if (h->dynindx != -1)
2100 goto keep;
2101 }
2102
2103 eh->dyn_relocs = NULL;
2104
2105 keep: ;
2106 }
2107
2108 /* Finally, allocate space. */
2109 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2110 {
2111 asection *sreloc;
2112
2113 if (use_indirect_section)
2114 sreloc = elf_section_data (p->sec)->indirect_relocs;
2115 else
2116 sreloc = elf_section_data (p->sec)->sreloc;
2117
2118 BFD_ASSERT (sreloc != NULL);
2119 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2120 }
2121
2122 return TRUE;
2123 }
2124
2125 /* Find any dynamic relocs that apply to read-only sections. */
2126
2127 static bfd_boolean
2128 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2129 {
2130 struct elf_i386_link_hash_entry *eh;
2131 struct elf_i386_dyn_relocs *p;
2132
2133 if (h->root.type == bfd_link_hash_warning)
2134 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2135
2136 eh = (struct elf_i386_link_hash_entry *) h;
2137 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2138 {
2139 asection *s = p->sec->output_section;
2140
2141 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2142 {
2143 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2144
2145 info->flags |= DF_TEXTREL;
2146
2147 /* Not an error, just cut short the traversal. */
2148 return FALSE;
2149 }
2150 }
2151 return TRUE;
2152 }
2153
2154 /* Set the sizes of the dynamic sections. */
2155
2156 static bfd_boolean
2157 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2158 struct bfd_link_info *info)
2159 {
2160 struct elf_i386_link_hash_table *htab;
2161 bfd *dynobj;
2162 asection *s;
2163 bfd_boolean relocs;
2164 bfd *ibfd;
2165
2166 htab = elf_i386_hash_table (info);
2167 dynobj = htab->elf.dynobj;
2168 if (dynobj == NULL)
2169 abort ();
2170
2171 if (htab->elf.dynamic_sections_created)
2172 {
2173 /* Set the contents of the .interp section to the interpreter. */
2174 if (info->executable)
2175 {
2176 s = bfd_get_section_by_name (dynobj, ".interp");
2177 if (s == NULL)
2178 abort ();
2179 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2180 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2181 }
2182 }
2183
2184 /* Set up .got offsets for local syms, and space for local dynamic
2185 relocs. */
2186 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2187 {
2188 bfd_signed_vma *local_got;
2189 bfd_signed_vma *end_local_got;
2190 char *local_tls_type;
2191 bfd_vma *local_tlsdesc_gotent;
2192 bfd_size_type locsymcount;
2193 Elf_Internal_Shdr *symtab_hdr;
2194 asection *srel;
2195
2196 if (! is_i386_elf (ibfd))
2197 continue;
2198
2199 for (s = ibfd->sections; s != NULL; s = s->next)
2200 {
2201 struct elf_i386_dyn_relocs *p;
2202
2203 for (p = ((struct elf_i386_dyn_relocs *)
2204 elf_section_data (s)->local_dynrel);
2205 p != NULL;
2206 p = p->next)
2207 {
2208 if (!bfd_is_abs_section (p->sec)
2209 && bfd_is_abs_section (p->sec->output_section))
2210 {
2211 /* Input section has been discarded, either because
2212 it is a copy of a linkonce section or due to
2213 linker script /DISCARD/, so we'll be discarding
2214 the relocs too. */
2215 }
2216 else if (htab->is_vxworks
2217 && strcmp (p->sec->output_section->name,
2218 ".tls_vars") == 0)
2219 {
2220 /* Relocations in vxworks .tls_vars sections are
2221 handled specially by the loader. */
2222 }
2223 else if (p->count != 0)
2224 {
2225 srel = elf_section_data (p->sec)->sreloc;
2226 srel->size += p->count * sizeof (Elf32_External_Rel);
2227 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2228 info->flags |= DF_TEXTREL;
2229 }
2230 }
2231 }
2232
2233 local_got = elf_local_got_refcounts (ibfd);
2234 if (!local_got)
2235 continue;
2236
2237 symtab_hdr = &elf_symtab_hdr (ibfd);
2238 locsymcount = symtab_hdr->sh_info;
2239 end_local_got = local_got + locsymcount;
2240 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2241 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2242 s = htab->sgot;
2243 srel = htab->srelgot;
2244 for (; local_got < end_local_got;
2245 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2246 {
2247 *local_tlsdesc_gotent = (bfd_vma) -1;
2248 if (*local_got > 0)
2249 {
2250 if (GOT_TLS_GDESC_P (*local_tls_type))
2251 {
2252 *local_tlsdesc_gotent = htab->sgotplt->size
2253 - elf_i386_compute_jump_table_size (htab);
2254 htab->sgotplt->size += 8;
2255 *local_got = (bfd_vma) -2;
2256 }
2257 if (! GOT_TLS_GDESC_P (*local_tls_type)
2258 || GOT_TLS_GD_P (*local_tls_type))
2259 {
2260 *local_got = s->size;
2261 s->size += 4;
2262 if (GOT_TLS_GD_P (*local_tls_type)
2263 || *local_tls_type == GOT_TLS_IE_BOTH)
2264 s->size += 4;
2265 }
2266 if (info->shared
2267 || GOT_TLS_GD_ANY_P (*local_tls_type)
2268 || (*local_tls_type & GOT_TLS_IE))
2269 {
2270 if (*local_tls_type == GOT_TLS_IE_BOTH)
2271 srel->size += 2 * sizeof (Elf32_External_Rel);
2272 else if (GOT_TLS_GD_P (*local_tls_type)
2273 || ! GOT_TLS_GDESC_P (*local_tls_type))
2274 srel->size += sizeof (Elf32_External_Rel);
2275 if (GOT_TLS_GDESC_P (*local_tls_type))
2276 htab->srelplt->size += sizeof (Elf32_External_Rel);
2277 }
2278 }
2279 else
2280 *local_got = (bfd_vma) -1;
2281 }
2282 }
2283
2284 if (htab->tls_ldm_got.refcount > 0)
2285 {
2286 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2287 relocs. */
2288 htab->tls_ldm_got.offset = htab->sgot->size;
2289 htab->sgot->size += 8;
2290 htab->srelgot->size += sizeof (Elf32_External_Rel);
2291 }
2292 else
2293 htab->tls_ldm_got.offset = -1;
2294
2295 /* Allocate global sym .plt and .got entries, and space for global
2296 sym dynamic relocs. */
2297 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, info);
2298
2299 /* For every jump slot reserved in the sgotplt, reloc_count is
2300 incremented. However, when we reserve space for TLS descriptors,
2301 it's not incremented, so in order to compute the space reserved
2302 for them, it suffices to multiply the reloc count by the jump
2303 slot size. */
2304 if (htab->srelplt)
2305 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2306
2307 /* We now have determined the sizes of the various dynamic sections.
2308 Allocate memory for them. */
2309 relocs = FALSE;
2310 for (s = dynobj->sections; s != NULL; s = s->next)
2311 {
2312 bfd_boolean strip_section = TRUE;
2313
2314 if ((s->flags & SEC_LINKER_CREATED) == 0)
2315 continue;
2316
2317 if (s == htab->splt
2318 || s == htab->sgot
2319 || s == htab->sgotplt
2320 || s == htab->sdynbss)
2321 {
2322 /* Strip this section if we don't need it; see the
2323 comment below. */
2324 /* We'd like to strip these sections if they aren't needed, but if
2325 we've exported dynamic symbols from them we must leave them.
2326 It's too late to tell BFD to get rid of the symbols. */
2327
2328 if (htab->elf.hplt != NULL)
2329 strip_section = FALSE;
2330 }
2331 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2332 {
2333 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
2334 relocs = TRUE;
2335
2336 /* We use the reloc_count field as a counter if we need
2337 to copy relocs into the output file. */
2338 s->reloc_count = 0;
2339 }
2340 else
2341 {
2342 /* It's not one of our sections, so don't allocate space. */
2343 continue;
2344 }
2345
2346 if (s->size == 0)
2347 {
2348 /* If we don't need this section, strip it from the
2349 output file. This is mostly to handle .rel.bss and
2350 .rel.plt. We must create both sections in
2351 create_dynamic_sections, because they must be created
2352 before the linker maps input sections to output
2353 sections. The linker does that before
2354 adjust_dynamic_symbol is called, and it is that
2355 function which decides whether anything needs to go
2356 into these sections. */
2357 if (strip_section)
2358 s->flags |= SEC_EXCLUDE;
2359 continue;
2360 }
2361
2362 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2363 continue;
2364
2365 /* Allocate memory for the section contents. We use bfd_zalloc
2366 here in case unused entries are not reclaimed before the
2367 section's contents are written out. This should not happen,
2368 but this way if it does, we get a R_386_NONE reloc instead
2369 of garbage. */
2370 s->contents = bfd_zalloc (dynobj, s->size);
2371 if (s->contents == NULL)
2372 return FALSE;
2373 }
2374
2375 if (htab->elf.dynamic_sections_created)
2376 {
2377 /* Add some entries to the .dynamic section. We fill in the
2378 values later, in elf_i386_finish_dynamic_sections, but we
2379 must add the entries now so that we get the correct size for
2380 the .dynamic section. The DT_DEBUG entry is filled in by the
2381 dynamic linker and used by the debugger. */
2382 #define add_dynamic_entry(TAG, VAL) \
2383 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2384
2385 if (info->executable)
2386 {
2387 if (!add_dynamic_entry (DT_DEBUG, 0))
2388 return FALSE;
2389 }
2390
2391 if (htab->splt->size != 0)
2392 {
2393 if (!add_dynamic_entry (DT_PLTGOT, 0)
2394 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2395 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2396 || !add_dynamic_entry (DT_JMPREL, 0))
2397 return FALSE;
2398 }
2399
2400 if (relocs)
2401 {
2402 if (!add_dynamic_entry (DT_REL, 0)
2403 || !add_dynamic_entry (DT_RELSZ, 0)
2404 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2405 return FALSE;
2406
2407 /* If any dynamic relocs apply to a read-only section,
2408 then we need a DT_TEXTREL entry. */
2409 if ((info->flags & DF_TEXTREL) == 0)
2410 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs, info);
2411
2412 if ((info->flags & DF_TEXTREL) != 0)
2413 {
2414 if (!add_dynamic_entry (DT_TEXTREL, 0))
2415 return FALSE;
2416 }
2417 }
2418 if (htab->is_vxworks
2419 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2420 return FALSE;
2421 }
2422 #undef add_dynamic_entry
2423
2424 return TRUE;
2425 }
2426
2427 static bfd_boolean
2428 elf_i386_always_size_sections (bfd *output_bfd,
2429 struct bfd_link_info *info)
2430 {
2431 asection *tls_sec = elf_hash_table (info)->tls_sec;
2432
2433 if (tls_sec)
2434 {
2435 struct elf_link_hash_entry *tlsbase;
2436
2437 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2438 "_TLS_MODULE_BASE_",
2439 FALSE, FALSE, FALSE);
2440
2441 if (tlsbase && tlsbase->type == STT_TLS)
2442 {
2443 struct bfd_link_hash_entry *bh = NULL;
2444 const struct elf_backend_data *bed
2445 = get_elf_backend_data (output_bfd);
2446
2447 if (!(_bfd_generic_link_add_one_symbol
2448 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2449 tls_sec, 0, NULL, FALSE,
2450 bed->collect, &bh)))
2451 return FALSE;
2452
2453 elf_i386_hash_table (info)->tls_module_base = bh;
2454
2455 tlsbase = (struct elf_link_hash_entry *)bh;
2456 tlsbase->def_regular = 1;
2457 tlsbase->other = STV_HIDDEN;
2458 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2459 }
2460 }
2461
2462 return TRUE;
2463 }
2464
2465 /* Set the correct type for an x86 ELF section. We do this by the
2466 section name, which is a hack, but ought to work. */
2467
2468 static bfd_boolean
2469 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2470 Elf_Internal_Shdr *hdr,
2471 asection *sec)
2472 {
2473 register const char *name;
2474
2475 name = bfd_get_section_name (abfd, sec);
2476
2477 /* This is an ugly, but unfortunately necessary hack that is
2478 needed when producing EFI binaries on x86. It tells
2479 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2480 containing ELF relocation info. We need this hack in order to
2481 be able to generate ELF binaries that can be translated into
2482 EFI applications (which are essentially COFF objects). Those
2483 files contain a COFF ".reloc" section inside an ELFNN object,
2484 which would normally cause BFD to segfault because it would
2485 attempt to interpret this section as containing relocation
2486 entries for section "oc". With this hack enabled, ".reloc"
2487 will be treated as a normal data section, which will avoid the
2488 segfault. However, you won't be able to create an ELFNN binary
2489 with a section named "oc" that needs relocations, but that's
2490 the kind of ugly side-effects you get when detecting section
2491 types based on their names... In practice, this limitation is
2492 unlikely to bite. */
2493 if (strcmp (name, ".reloc") == 0)
2494 hdr->sh_type = SHT_PROGBITS;
2495
2496 return TRUE;
2497 }
2498
2499 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2500 executables. Rather than setting it to the beginning of the TLS
2501 section, we have to set it to the end. This function may be called
2502 multiple times, it is idempotent. */
2503
2504 static void
2505 set_tls_module_base (struct bfd_link_info *info)
2506 {
2507 struct bfd_link_hash_entry *base;
2508
2509 if (!info->executable)
2510 return;
2511
2512 base = elf_i386_hash_table (info)->tls_module_base;
2513
2514 if (!base)
2515 return;
2516
2517 base->u.def.value = elf_hash_table (info)->tls_size;
2518 }
2519
2520 /* Return the base VMA address which should be subtracted from real addresses
2521 when resolving @dtpoff relocation.
2522 This is PT_TLS segment p_vaddr. */
2523
2524 static bfd_vma
2525 dtpoff_base (struct bfd_link_info *info)
2526 {
2527 /* If tls_sec is NULL, we should have signalled an error already. */
2528 if (elf_hash_table (info)->tls_sec == NULL)
2529 return 0;
2530 return elf_hash_table (info)->tls_sec->vma;
2531 }
2532
2533 /* Return the relocation value for @tpoff relocation
2534 if STT_TLS virtual address is ADDRESS. */
2535
2536 static bfd_vma
2537 tpoff (struct bfd_link_info *info, bfd_vma address)
2538 {
2539 struct elf_link_hash_table *htab = elf_hash_table (info);
2540
2541 /* If tls_sec is NULL, we should have signalled an error already. */
2542 if (htab->tls_sec == NULL)
2543 return 0;
2544 return htab->tls_size + htab->tls_sec->vma - address;
2545 }
2546
2547 /* Relocate an i386 ELF section. */
2548
2549 static bfd_boolean
2550 elf_i386_relocate_section (bfd *output_bfd,
2551 struct bfd_link_info *info,
2552 bfd *input_bfd,
2553 asection *input_section,
2554 bfd_byte *contents,
2555 Elf_Internal_Rela *relocs,
2556 Elf_Internal_Sym *local_syms,
2557 asection **local_sections)
2558 {
2559 struct elf_i386_link_hash_table *htab;
2560 Elf_Internal_Shdr *symtab_hdr;
2561 struct elf_link_hash_entry **sym_hashes;
2562 bfd_vma *local_got_offsets;
2563 bfd_vma *local_tlsdesc_gotents;
2564 Elf_Internal_Rela *rel;
2565 Elf_Internal_Rela *relend;
2566 bfd_boolean is_vxworks_tls;
2567
2568 BFD_ASSERT (is_i386_elf (input_bfd));
2569
2570 htab = elf_i386_hash_table (info);
2571 symtab_hdr = &elf_symtab_hdr (input_bfd);
2572 sym_hashes = elf_sym_hashes (input_bfd);
2573 local_got_offsets = elf_local_got_offsets (input_bfd);
2574 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2575 /* We have to handle relocations in vxworks .tls_vars sections
2576 specially, because the dynamic loader is 'weird'. */
2577 is_vxworks_tls = (htab->is_vxworks && info->shared
2578 && !strcmp (input_section->output_section->name,
2579 ".tls_vars"));
2580
2581 set_tls_module_base (info);
2582
2583 rel = relocs;
2584 relend = relocs + input_section->reloc_count;
2585 for (; rel < relend; rel++)
2586 {
2587 unsigned int r_type;
2588 reloc_howto_type *howto;
2589 unsigned long r_symndx;
2590 struct elf_link_hash_entry *h;
2591 Elf_Internal_Sym *sym;
2592 asection *sec;
2593 bfd_vma off, offplt;
2594 bfd_vma relocation;
2595 bfd_boolean unresolved_reloc;
2596 bfd_reloc_status_type r;
2597 unsigned int indx;
2598 int tls_type;
2599
2600 r_type = ELF32_R_TYPE (rel->r_info);
2601 if (r_type == R_386_GNU_VTINHERIT
2602 || r_type == R_386_GNU_VTENTRY)
2603 continue;
2604
2605 if ((indx = r_type) >= R_386_standard
2606 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2607 >= R_386_ext - R_386_standard)
2608 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2609 >= R_386_tls - R_386_ext))
2610 {
2611 (*_bfd_error_handler)
2612 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2613 input_bfd, input_section, r_type);
2614 bfd_set_error (bfd_error_bad_value);
2615 return FALSE;
2616 }
2617 howto = elf_howto_table + indx;
2618
2619 r_symndx = ELF32_R_SYM (rel->r_info);
2620 h = NULL;
2621 sym = NULL;
2622 sec = NULL;
2623 unresolved_reloc = FALSE;
2624 if (r_symndx < symtab_hdr->sh_info)
2625 {
2626 sym = local_syms + r_symndx;
2627 sec = local_sections[r_symndx];
2628 relocation = (sec->output_section->vma
2629 + sec->output_offset
2630 + sym->st_value);
2631
2632 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2633 && ((sec->flags & SEC_MERGE) != 0
2634 || (info->relocatable
2635 && sec->output_offset != 0)))
2636 {
2637 bfd_vma addend;
2638 bfd_byte *where = contents + rel->r_offset;
2639
2640 switch (howto->size)
2641 {
2642 case 0:
2643 addend = bfd_get_8 (input_bfd, where);
2644 if (howto->pc_relative)
2645 {
2646 addend = (addend ^ 0x80) - 0x80;
2647 addend += 1;
2648 }
2649 break;
2650 case 1:
2651 addend = bfd_get_16 (input_bfd, where);
2652 if (howto->pc_relative)
2653 {
2654 addend = (addend ^ 0x8000) - 0x8000;
2655 addend += 2;
2656 }
2657 break;
2658 case 2:
2659 addend = bfd_get_32 (input_bfd, where);
2660 if (howto->pc_relative)
2661 {
2662 addend = (addend ^ 0x80000000) - 0x80000000;
2663 addend += 4;
2664 }
2665 break;
2666 default:
2667 abort ();
2668 }
2669
2670 if (info->relocatable)
2671 addend += sec->output_offset;
2672 else
2673 {
2674 asection *msec = sec;
2675 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2676 addend);
2677 addend -= relocation;
2678 addend += msec->output_section->vma + msec->output_offset;
2679 }
2680
2681 switch (howto->size)
2682 {
2683 case 0:
2684 /* FIXME: overflow checks. */
2685 if (howto->pc_relative)
2686 addend -= 1;
2687 bfd_put_8 (input_bfd, addend, where);
2688 break;
2689 case 1:
2690 if (howto->pc_relative)
2691 addend -= 2;
2692 bfd_put_16 (input_bfd, addend, where);
2693 break;
2694 case 2:
2695 if (howto->pc_relative)
2696 addend -= 4;
2697 bfd_put_32 (input_bfd, addend, where);
2698 break;
2699 }
2700 }
2701 }
2702 else
2703 {
2704 bfd_boolean warned;
2705
2706 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2707 r_symndx, symtab_hdr, sym_hashes,
2708 h, sec, relocation,
2709 unresolved_reloc, warned);
2710 }
2711
2712 if (sec != NULL && elf_discarded_section (sec))
2713 {
2714 /* For relocs against symbols from removed linkonce sections,
2715 or sections discarded by a linker script, we just want the
2716 section contents zeroed. Avoid any special processing. */
2717 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2718 rel->r_info = 0;
2719 rel->r_addend = 0;
2720 continue;
2721 }
2722
2723 if (info->relocatable)
2724 continue;
2725
2726 switch (r_type)
2727 {
2728 case R_386_GOT32:
2729 /* Relocation is to the entry for this symbol in the global
2730 offset table. */
2731 if (htab->sgot == NULL)
2732 abort ();
2733
2734 if (h != NULL)
2735 {
2736 bfd_boolean dyn;
2737
2738 off = h->got.offset;
2739 dyn = htab->elf.dynamic_sections_created;
2740 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2741 || (info->shared
2742 && SYMBOL_REFERENCES_LOCAL (info, h))
2743 || (ELF_ST_VISIBILITY (h->other)
2744 && h->root.type == bfd_link_hash_undefweak))
2745 {
2746 /* This is actually a static link, or it is a
2747 -Bsymbolic link and the symbol is defined
2748 locally, or the symbol was forced to be local
2749 because of a version file. We must initialize
2750 this entry in the global offset table. Since the
2751 offset must always be a multiple of 4, we use the
2752 least significant bit to record whether we have
2753 initialized it already.
2754
2755 When doing a dynamic link, we create a .rel.got
2756 relocation entry to initialize the value. This
2757 is done in the finish_dynamic_symbol routine. */
2758 if ((off & 1) != 0)
2759 off &= ~1;
2760 else
2761 {
2762 bfd_put_32 (output_bfd, relocation,
2763 htab->sgot->contents + off);
2764 h->got.offset |= 1;
2765 }
2766 }
2767 else
2768 unresolved_reloc = FALSE;
2769 }
2770 else
2771 {
2772 if (local_got_offsets == NULL)
2773 abort ();
2774
2775 off = local_got_offsets[r_symndx];
2776
2777 /* The offset must always be a multiple of 4. We use
2778 the least significant bit to record whether we have
2779 already generated the necessary reloc. */
2780 if ((off & 1) != 0)
2781 off &= ~1;
2782 else
2783 {
2784 bfd_put_32 (output_bfd, relocation,
2785 htab->sgot->contents + off);
2786
2787 if (info->shared)
2788 {
2789 asection *s;
2790 Elf_Internal_Rela outrel;
2791 bfd_byte *loc;
2792
2793 s = htab->srelgot;
2794 if (s == NULL)
2795 abort ();
2796
2797 outrel.r_offset = (htab->sgot->output_section->vma
2798 + htab->sgot->output_offset
2799 + off);
2800 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2801 loc = s->contents;
2802 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2803 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2804 }
2805
2806 local_got_offsets[r_symndx] |= 1;
2807 }
2808 }
2809
2810 if (off >= (bfd_vma) -2)
2811 abort ();
2812
2813 relocation = htab->sgot->output_section->vma
2814 + htab->sgot->output_offset + off
2815 - htab->sgotplt->output_section->vma
2816 - htab->sgotplt->output_offset;
2817 break;
2818
2819 case R_386_GOTOFF:
2820 /* Relocation is relative to the start of the global offset
2821 table. */
2822
2823 /* Check to make sure it isn't a protected function symbol
2824 for shared library since it may not be local when used
2825 as function address. We also need to make sure that a
2826 symbol is defined locally. */
2827 if (info->shared && h)
2828 {
2829 if (!h->def_regular)
2830 {
2831 const char *v;
2832
2833 switch (ELF_ST_VISIBILITY (h->other))
2834 {
2835 case STV_HIDDEN:
2836 v = _("hidden symbol");
2837 break;
2838 case STV_INTERNAL:
2839 v = _("internal symbol");
2840 break;
2841 case STV_PROTECTED:
2842 v = _("protected symbol");
2843 break;
2844 default:
2845 v = _("symbol");
2846 break;
2847 }
2848
2849 (*_bfd_error_handler)
2850 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
2851 input_bfd, v, h->root.root.string);
2852 bfd_set_error (bfd_error_bad_value);
2853 return FALSE;
2854 }
2855 else if (!info->executable
2856 && h->type == STT_FUNC
2857 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2858 {
2859 (*_bfd_error_handler)
2860 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2861 input_bfd, h->root.root.string);
2862 bfd_set_error (bfd_error_bad_value);
2863 return FALSE;
2864 }
2865 }
2866
2867 /* Note that sgot is not involved in this
2868 calculation. We always want the start of .got.plt. If we
2869 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2870 permitted by the ABI, we might have to change this
2871 calculation. */
2872 relocation -= htab->sgotplt->output_section->vma
2873 + htab->sgotplt->output_offset;
2874 break;
2875
2876 case R_386_GOTPC:
2877 /* Use global offset table as symbol value. */
2878 relocation = htab->sgotplt->output_section->vma
2879 + htab->sgotplt->output_offset;
2880 unresolved_reloc = FALSE;
2881 break;
2882
2883 case R_386_PLT32:
2884 /* Relocation is to the entry for this symbol in the
2885 procedure linkage table. */
2886
2887 /* Resolve a PLT32 reloc against a local symbol directly,
2888 without using the procedure linkage table. */
2889 if (h == NULL)
2890 break;
2891
2892 if (h->plt.offset == (bfd_vma) -1
2893 || htab->splt == NULL)
2894 {
2895 /* We didn't make a PLT entry for this symbol. This
2896 happens when statically linking PIC code, or when
2897 using -Bsymbolic. */
2898 break;
2899 }
2900
2901 relocation = (htab->splt->output_section->vma
2902 + htab->splt->output_offset
2903 + h->plt.offset);
2904 unresolved_reloc = FALSE;
2905 break;
2906
2907 case R_386_32:
2908 case R_386_PC32:
2909 if ((input_section->flags & SEC_ALLOC) == 0
2910 || is_vxworks_tls)
2911 break;
2912
2913 if ((info->shared
2914 && (h == NULL
2915 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2916 || h->root.type != bfd_link_hash_undefweak)
2917 && (r_type != R_386_PC32
2918 || !SYMBOL_CALLS_LOCAL (info, h)))
2919 || (! info->shared
2920 && h != NULL
2921 && h->dynindx != -1
2922 && ! h->forced_local
2923 && ((struct elf_i386_link_hash_entry *) h)->dyn_relocs != NULL
2924 && is_indirect_symbol (output_bfd, h))
2925 || (ELIMINATE_COPY_RELOCS
2926 && !info->shared
2927 && h != NULL
2928 && h->dynindx != -1
2929 && !h->non_got_ref
2930 && ((h->def_dynamic
2931 && !h->def_regular)
2932 || h->root.type == bfd_link_hash_undefweak
2933 || h->root.type == bfd_link_hash_undefined)))
2934 {
2935 Elf_Internal_Rela outrel;
2936 bfd_byte *loc;
2937 bfd_boolean skip, relocate;
2938 asection *sreloc;
2939
2940 /* When generating a shared object, these relocations
2941 are copied into the output file to be resolved at run
2942 time. */
2943
2944 skip = FALSE;
2945 relocate = FALSE;
2946
2947 outrel.r_offset =
2948 _bfd_elf_section_offset (output_bfd, info, input_section,
2949 rel->r_offset);
2950 if (outrel.r_offset == (bfd_vma) -1)
2951 skip = TRUE;
2952 else if (outrel.r_offset == (bfd_vma) -2)
2953 skip = TRUE, relocate = TRUE;
2954 outrel.r_offset += (input_section->output_section->vma
2955 + input_section->output_offset);
2956
2957 if (skip)
2958 memset (&outrel, 0, sizeof outrel);
2959 else if (h != NULL
2960 && h->dynindx != -1
2961 && (r_type == R_386_PC32
2962 || !info->shared
2963 || !SYMBOLIC_BIND (info, h)
2964 || !h->def_regular))
2965 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2966 else
2967 {
2968 /* This symbol is local, or marked to become local. */
2969 relocate = TRUE;
2970 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2971 }
2972
2973 if (! info->shared
2974 && h != NULL
2975 && h->dynindx != -1
2976 && ! h->forced_local
2977 && is_indirect_symbol (output_bfd, h)
2978 && elf_section_data (input_section)->indirect_relocs != NULL
2979 && elf_section_data (input_section)->indirect_relocs->contents != NULL)
2980 sreloc = elf_section_data (input_section)->indirect_relocs;
2981 else
2982 sreloc = elf_section_data (input_section)->sreloc;
2983
2984 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
2985
2986 loc = sreloc->contents;
2987 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2988
2989 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2990
2991 /* If this reloc is against an external symbol, we do
2992 not want to fiddle with the addend. Otherwise, we
2993 need to include the symbol value so that it becomes
2994 an addend for the dynamic reloc. */
2995 if (! relocate)
2996 continue;
2997 }
2998 break;
2999
3000 case R_386_TLS_IE:
3001 if (info->shared)
3002 {
3003 Elf_Internal_Rela outrel;
3004 bfd_byte *loc;
3005 asection *sreloc;
3006
3007 outrel.r_offset = rel->r_offset
3008 + input_section->output_section->vma
3009 + input_section->output_offset;
3010 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3011 sreloc = elf_section_data (input_section)->sreloc;
3012 if (sreloc == NULL)
3013 abort ();
3014 loc = sreloc->contents;
3015 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3016 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3017 }
3018 /* Fall through */
3019
3020 case R_386_TLS_GD:
3021 case R_386_TLS_GOTDESC:
3022 case R_386_TLS_DESC_CALL:
3023 case R_386_TLS_IE_32:
3024 case R_386_TLS_GOTIE:
3025 tls_type = GOT_UNKNOWN;
3026 if (h == NULL && local_got_offsets)
3027 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3028 else if (h != NULL)
3029 tls_type = elf_i386_hash_entry(h)->tls_type;
3030 if (tls_type == GOT_TLS_IE)
3031 tls_type = GOT_TLS_IE_NEG;
3032
3033 if (! elf_i386_tls_transition (info, input_bfd,
3034 input_section, contents,
3035 symtab_hdr, sym_hashes,
3036 &r_type, tls_type, rel,
3037 relend, h))
3038 return FALSE;
3039
3040 if (r_type == R_386_TLS_LE_32)
3041 {
3042 BFD_ASSERT (! unresolved_reloc);
3043 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3044 {
3045 unsigned int type;
3046 bfd_vma roff;
3047
3048 /* GD->LE transition. */
3049 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3050 if (type == 0x04)
3051 {
3052 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3053 Change it into:
3054 movl %gs:0, %eax; subl $foo@tpoff, %eax
3055 (6 byte form of subl). */
3056 memcpy (contents + rel->r_offset - 3,
3057 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3058 roff = rel->r_offset + 5;
3059 }
3060 else
3061 {
3062 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3063 Change it into:
3064 movl %gs:0, %eax; subl $foo@tpoff, %eax
3065 (6 byte form of subl). */
3066 memcpy (contents + rel->r_offset - 2,
3067 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3068 roff = rel->r_offset + 6;
3069 }
3070 bfd_put_32 (output_bfd, tpoff (info, relocation),
3071 contents + roff);
3072 /* Skip R_386_PC32/R_386_PLT32. */
3073 rel++;
3074 continue;
3075 }
3076 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3077 {
3078 /* GDesc -> LE transition.
3079 It's originally something like:
3080 leal x@tlsdesc(%ebx), %eax
3081
3082 leal x@ntpoff, %eax
3083
3084 Registers other than %eax may be set up here. */
3085
3086 unsigned int val;
3087 bfd_vma roff;
3088
3089 roff = rel->r_offset;
3090 val = bfd_get_8 (input_bfd, contents + roff - 1);
3091
3092 /* Now modify the instruction as appropriate. */
3093 /* aoliva FIXME: remove the above and xor the byte
3094 below with 0x86. */
3095 bfd_put_8 (output_bfd, val ^ 0x86,
3096 contents + roff - 1);
3097 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3098 contents + roff);
3099 continue;
3100 }
3101 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3102 {
3103 /* GDesc -> LE transition.
3104 It's originally:
3105 call *(%eax)
3106 Turn it into:
3107 xchg %ax,%ax */
3108
3109 bfd_vma roff;
3110
3111 roff = rel->r_offset;
3112 bfd_put_8 (output_bfd, 0x66, contents + roff);
3113 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3114 continue;
3115 }
3116 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3117 {
3118 unsigned int val;
3119
3120 /* IE->LE transition:
3121 Originally it can be one of:
3122 movl foo, %eax
3123 movl foo, %reg
3124 addl foo, %reg
3125 We change it into:
3126 movl $foo, %eax
3127 movl $foo, %reg
3128 addl $foo, %reg. */
3129 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3130 if (val == 0xa1)
3131 {
3132 /* movl foo, %eax. */
3133 bfd_put_8 (output_bfd, 0xb8,
3134 contents + rel->r_offset - 1);
3135 }
3136 else
3137 {
3138 unsigned int type;
3139
3140 type = bfd_get_8 (input_bfd,
3141 contents + rel->r_offset - 2);
3142 switch (type)
3143 {
3144 case 0x8b:
3145 /* movl */
3146 bfd_put_8 (output_bfd, 0xc7,
3147 contents + rel->r_offset - 2);
3148 bfd_put_8 (output_bfd,
3149 0xc0 | ((val >> 3) & 7),
3150 contents + rel->r_offset - 1);
3151 break;
3152 case 0x03:
3153 /* addl */
3154 bfd_put_8 (output_bfd, 0x81,
3155 contents + rel->r_offset - 2);
3156 bfd_put_8 (output_bfd,
3157 0xc0 | ((val >> 3) & 7),
3158 contents + rel->r_offset - 1);
3159 break;
3160 default:
3161 BFD_FAIL ();
3162 break;
3163 }
3164 }
3165 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3166 contents + rel->r_offset);
3167 continue;
3168 }
3169 else
3170 {
3171 unsigned int val, type;
3172
3173 /* {IE_32,GOTIE}->LE transition:
3174 Originally it can be one of:
3175 subl foo(%reg1), %reg2
3176 movl foo(%reg1), %reg2
3177 addl foo(%reg1), %reg2
3178 We change it into:
3179 subl $foo, %reg2
3180 movl $foo, %reg2 (6 byte form)
3181 addl $foo, %reg2. */
3182 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3183 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3184 if (type == 0x8b)
3185 {
3186 /* movl */
3187 bfd_put_8 (output_bfd, 0xc7,
3188 contents + rel->r_offset - 2);
3189 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3190 contents + rel->r_offset - 1);
3191 }
3192 else if (type == 0x2b)
3193 {
3194 /* subl */
3195 bfd_put_8 (output_bfd, 0x81,
3196 contents + rel->r_offset - 2);
3197 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3198 contents + rel->r_offset - 1);
3199 }
3200 else if (type == 0x03)
3201 {
3202 /* addl */
3203 bfd_put_8 (output_bfd, 0x81,
3204 contents + rel->r_offset - 2);
3205 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3206 contents + rel->r_offset - 1);
3207 }
3208 else
3209 BFD_FAIL ();
3210 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3211 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3212 contents + rel->r_offset);
3213 else
3214 bfd_put_32 (output_bfd, tpoff (info, relocation),
3215 contents + rel->r_offset);
3216 continue;
3217 }
3218 }
3219
3220 if (htab->sgot == NULL)
3221 abort ();
3222
3223 if (h != NULL)
3224 {
3225 off = h->got.offset;
3226 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3227 }
3228 else
3229 {
3230 if (local_got_offsets == NULL)
3231 abort ();
3232
3233 off = local_got_offsets[r_symndx];
3234 offplt = local_tlsdesc_gotents[r_symndx];
3235 }
3236
3237 if ((off & 1) != 0)
3238 off &= ~1;
3239 else
3240 {
3241 Elf_Internal_Rela outrel;
3242 bfd_byte *loc;
3243 int dr_type, indx;
3244 asection *sreloc;
3245
3246 if (htab->srelgot == NULL)
3247 abort ();
3248
3249 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3250
3251 if (GOT_TLS_GDESC_P (tls_type))
3252 {
3253 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3254 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3255 <= htab->sgotplt->size);
3256 outrel.r_offset = (htab->sgotplt->output_section->vma
3257 + htab->sgotplt->output_offset
3258 + offplt
3259 + htab->sgotplt_jump_table_size);
3260 sreloc = htab->srelplt;
3261 loc = sreloc->contents;
3262 loc += (htab->next_tls_desc_index++
3263 * sizeof (Elf32_External_Rel));
3264 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3265 <= sreloc->contents + sreloc->size);
3266 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3267 if (indx == 0)
3268 {
3269 BFD_ASSERT (! unresolved_reloc);
3270 bfd_put_32 (output_bfd,
3271 relocation - dtpoff_base (info),
3272 htab->sgotplt->contents + offplt
3273 + htab->sgotplt_jump_table_size + 4);
3274 }
3275 else
3276 {
3277 bfd_put_32 (output_bfd, 0,
3278 htab->sgotplt->contents + offplt
3279 + htab->sgotplt_jump_table_size + 4);
3280 }
3281 }
3282
3283 sreloc = htab->srelgot;
3284
3285 outrel.r_offset = (htab->sgot->output_section->vma
3286 + htab->sgot->output_offset + off);
3287
3288 if (GOT_TLS_GD_P (tls_type))
3289 dr_type = R_386_TLS_DTPMOD32;
3290 else if (GOT_TLS_GDESC_P (tls_type))
3291 goto dr_done;
3292 else if (tls_type == GOT_TLS_IE_POS)
3293 dr_type = R_386_TLS_TPOFF;
3294 else
3295 dr_type = R_386_TLS_TPOFF32;
3296
3297 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3298 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
3299 htab->sgot->contents + off);
3300 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3301 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
3302 htab->sgot->contents + off);
3303 else if (dr_type != R_386_TLS_DESC)
3304 bfd_put_32 (output_bfd, 0,
3305 htab->sgot->contents + off);
3306 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3307
3308 loc = sreloc->contents;
3309 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3310 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3311 <= sreloc->contents + sreloc->size);
3312 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3313
3314 if (GOT_TLS_GD_P (tls_type))
3315 {
3316 if (indx == 0)
3317 {
3318 BFD_ASSERT (! unresolved_reloc);
3319 bfd_put_32 (output_bfd,
3320 relocation - dtpoff_base (info),
3321 htab->sgot->contents + off + 4);
3322 }
3323 else
3324 {
3325 bfd_put_32 (output_bfd, 0,
3326 htab->sgot->contents + off + 4);
3327 outrel.r_info = ELF32_R_INFO (indx,
3328 R_386_TLS_DTPOFF32);
3329 outrel.r_offset += 4;
3330 sreloc->reloc_count++;
3331 loc += sizeof (Elf32_External_Rel);
3332 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3333 <= sreloc->contents + sreloc->size);
3334 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3335 }
3336 }
3337 else if (tls_type == GOT_TLS_IE_BOTH)
3338 {
3339 bfd_put_32 (output_bfd,
3340 indx == 0 ? relocation - dtpoff_base (info) : 0,
3341 htab->sgot->contents + off + 4);
3342 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3343 outrel.r_offset += 4;
3344 sreloc->reloc_count++;
3345 loc += sizeof (Elf32_External_Rel);
3346 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3347 }
3348
3349 dr_done:
3350 if (h != NULL)
3351 h->got.offset |= 1;
3352 else
3353 local_got_offsets[r_symndx] |= 1;
3354 }
3355
3356 if (off >= (bfd_vma) -2
3357 && ! GOT_TLS_GDESC_P (tls_type))
3358 abort ();
3359 if (r_type == R_386_TLS_GOTDESC
3360 || r_type == R_386_TLS_DESC_CALL)
3361 {
3362 relocation = htab->sgotplt_jump_table_size + offplt;
3363 unresolved_reloc = FALSE;
3364 }
3365 else if (r_type == ELF32_R_TYPE (rel->r_info))
3366 {
3367 bfd_vma g_o_t = htab->sgotplt->output_section->vma
3368 + htab->sgotplt->output_offset;
3369 relocation = htab->sgot->output_section->vma
3370 + htab->sgot->output_offset + off - g_o_t;
3371 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3372 && tls_type == GOT_TLS_IE_BOTH)
3373 relocation += 4;
3374 if (r_type == R_386_TLS_IE)
3375 relocation += g_o_t;
3376 unresolved_reloc = FALSE;
3377 }
3378 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3379 {
3380 unsigned int val, type;
3381 bfd_vma roff;
3382
3383 /* GD->IE transition. */
3384 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3385 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3386 if (type == 0x04)
3387 {
3388 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3389 Change it into:
3390 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3391 val >>= 3;
3392 roff = rel->r_offset - 3;
3393 }
3394 else
3395 {
3396 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3397 Change it into:
3398 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3399 roff = rel->r_offset - 2;
3400 }
3401 memcpy (contents + roff,
3402 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3403 contents[roff + 7] = 0x80 | (val & 7);
3404 /* If foo is used only with foo@gotntpoff(%reg) and
3405 foo@indntpoff, but not with foo@gottpoff(%reg), change
3406 subl $foo@gottpoff(%reg), %eax
3407 into:
3408 addl $foo@gotntpoff(%reg), %eax. */
3409 if (tls_type == GOT_TLS_IE_POS)
3410 contents[roff + 6] = 0x03;
3411 bfd_put_32 (output_bfd,
3412 htab->sgot->output_section->vma
3413 + htab->sgot->output_offset + off
3414 - htab->sgotplt->output_section->vma
3415 - htab->sgotplt->output_offset,
3416 contents + roff + 8);
3417 /* Skip R_386_PLT32. */
3418 rel++;
3419 continue;
3420 }
3421 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3422 {
3423 /* GDesc -> IE transition.
3424 It's originally something like:
3425 leal x@tlsdesc(%ebx), %eax
3426
3427 Change it to:
3428 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3429 or:
3430 movl x@gottpoff(%ebx), %eax # before negl %eax
3431
3432 Registers other than %eax may be set up here. */
3433
3434 bfd_vma roff;
3435
3436 /* First, make sure it's a leal adding ebx to a 32-bit
3437 offset into any register, although it's probably
3438 almost always going to be eax. */
3439 roff = rel->r_offset;
3440
3441 /* Now modify the instruction as appropriate. */
3442 /* To turn a leal into a movl in the form we use it, it
3443 suffices to change the first byte from 0x8d to 0x8b.
3444 aoliva FIXME: should we decide to keep the leal, all
3445 we have to do is remove the statement below, and
3446 adjust the relaxation of R_386_TLS_DESC_CALL. */
3447 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3448
3449 if (tls_type == GOT_TLS_IE_BOTH)
3450 off += 4;
3451
3452 bfd_put_32 (output_bfd,
3453 htab->sgot->output_section->vma
3454 + htab->sgot->output_offset + off
3455 - htab->sgotplt->output_section->vma
3456 - htab->sgotplt->output_offset,
3457 contents + roff);
3458 continue;
3459 }
3460 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3461 {
3462 /* GDesc -> IE transition.
3463 It's originally:
3464 call *(%eax)
3465
3466 Change it to:
3467 xchg %ax,%ax
3468 or
3469 negl %eax
3470 depending on how we transformed the TLS_GOTDESC above.
3471 */
3472
3473 bfd_vma roff;
3474
3475 roff = rel->r_offset;
3476
3477 /* Now modify the instruction as appropriate. */
3478 if (tls_type != GOT_TLS_IE_NEG)
3479 {
3480 /* xchg %ax,%ax */
3481 bfd_put_8 (output_bfd, 0x66, contents + roff);
3482 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3483 }
3484 else
3485 {
3486 /* negl %eax */
3487 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3488 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3489 }
3490
3491 continue;
3492 }
3493 else
3494 BFD_ASSERT (FALSE);
3495 break;
3496
3497 case R_386_TLS_LDM:
3498 if (! elf_i386_tls_transition (info, input_bfd,
3499 input_section, contents,
3500 symtab_hdr, sym_hashes,
3501 &r_type, GOT_UNKNOWN, rel,
3502 relend, h))
3503 return FALSE;
3504
3505 if (r_type != R_386_TLS_LDM)
3506 {
3507 /* LD->LE transition:
3508 leal foo(%reg), %eax; call ___tls_get_addr.
3509 We change it into:
3510 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3511 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3512 memcpy (contents + rel->r_offset - 2,
3513 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3514 /* Skip R_386_PC32/R_386_PLT32. */
3515 rel++;
3516 continue;
3517 }
3518
3519 if (htab->sgot == NULL)
3520 abort ();
3521
3522 off = htab->tls_ldm_got.offset;
3523 if (off & 1)
3524 off &= ~1;
3525 else
3526 {
3527 Elf_Internal_Rela outrel;
3528 bfd_byte *loc;
3529
3530 if (htab->srelgot == NULL)
3531 abort ();
3532
3533 outrel.r_offset = (htab->sgot->output_section->vma
3534 + htab->sgot->output_offset + off);
3535
3536 bfd_put_32 (output_bfd, 0,
3537 htab->sgot->contents + off);
3538 bfd_put_32 (output_bfd, 0,
3539 htab->sgot->contents + off + 4);
3540 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3541 loc = htab->srelgot->contents;
3542 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3543 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3544 htab->tls_ldm_got.offset |= 1;
3545 }
3546 relocation = htab->sgot->output_section->vma
3547 + htab->sgot->output_offset + off
3548 - htab->sgotplt->output_section->vma
3549 - htab->sgotplt->output_offset;
3550 unresolved_reloc = FALSE;
3551 break;
3552
3553 case R_386_TLS_LDO_32:
3554 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3555 relocation -= dtpoff_base (info);
3556 else
3557 /* When converting LDO to LE, we must negate. */
3558 relocation = -tpoff (info, relocation);
3559 break;
3560
3561 case R_386_TLS_LE_32:
3562 case R_386_TLS_LE:
3563 if (info->shared)
3564 {
3565 Elf_Internal_Rela outrel;
3566 asection *sreloc;
3567 bfd_byte *loc;
3568 int indx;
3569
3570 outrel.r_offset = rel->r_offset
3571 + input_section->output_section->vma
3572 + input_section->output_offset;
3573 if (h != NULL && h->dynindx != -1)
3574 indx = h->dynindx;
3575 else
3576 indx = 0;
3577 if (r_type == R_386_TLS_LE_32)
3578 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3579 else
3580 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3581 sreloc = elf_section_data (input_section)->sreloc;
3582 if (sreloc == NULL)
3583 abort ();
3584 loc = sreloc->contents;
3585 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3586 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3587 if (indx)
3588 continue;
3589 else if (r_type == R_386_TLS_LE_32)
3590 relocation = dtpoff_base (info) - relocation;
3591 else
3592 relocation -= dtpoff_base (info);
3593 }
3594 else if (r_type == R_386_TLS_LE_32)
3595 relocation = tpoff (info, relocation);
3596 else
3597 relocation = -tpoff (info, relocation);
3598 break;
3599
3600 default:
3601 break;
3602 }
3603
3604 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3605 because such sections are not SEC_ALLOC and thus ld.so will
3606 not process them. */
3607 if (unresolved_reloc
3608 && !((input_section->flags & SEC_DEBUGGING) != 0
3609 && h->def_dynamic))
3610 {
3611 (*_bfd_error_handler)
3612 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3613 input_bfd,
3614 input_section,
3615 (long) rel->r_offset,
3616 howto->name,
3617 h->root.root.string);
3618 return FALSE;
3619 }
3620
3621 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3622 contents, rel->r_offset,
3623 relocation, 0);
3624
3625 if (r != bfd_reloc_ok)
3626 {
3627 const char *name;
3628
3629 if (h != NULL)
3630 name = h->root.root.string;
3631 else
3632 {
3633 name = bfd_elf_string_from_elf_section (input_bfd,
3634 symtab_hdr->sh_link,
3635 sym->st_name);
3636 if (name == NULL)
3637 return FALSE;
3638 if (*name == '\0')
3639 name = bfd_section_name (input_bfd, sec);
3640 }
3641
3642 if (r == bfd_reloc_overflow)
3643 {
3644 if (! ((*info->callbacks->reloc_overflow)
3645 (info, (h ? &h->root : NULL), name, howto->name,
3646 (bfd_vma) 0, input_bfd, input_section,
3647 rel->r_offset)))
3648 return FALSE;
3649 }
3650 else
3651 {
3652 (*_bfd_error_handler)
3653 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3654 input_bfd, input_section,
3655 (long) rel->r_offset, name, (int) r);
3656 return FALSE;
3657 }
3658 }
3659 }
3660
3661 return TRUE;
3662 }
3663
3664 /* Finish up dynamic symbol handling. We set the contents of various
3665 dynamic sections here. */
3666
3667 static bfd_boolean
3668 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3669 struct bfd_link_info *info,
3670 struct elf_link_hash_entry *h,
3671 Elf_Internal_Sym *sym)
3672 {
3673 struct elf_i386_link_hash_table *htab;
3674
3675 htab = elf_i386_hash_table (info);
3676
3677 if (h->plt.offset != (bfd_vma) -1)
3678 {
3679 bfd_vma plt_index;
3680 bfd_vma got_offset;
3681 Elf_Internal_Rela rel;
3682 bfd_byte *loc;
3683
3684 /* This symbol has an entry in the procedure linkage table. Set
3685 it up. */
3686
3687 if (h->dynindx == -1
3688 || htab->splt == NULL
3689 || htab->sgotplt == NULL
3690 || htab->srelplt == NULL)
3691 abort ();
3692
3693 /* Get the index in the procedure linkage table which
3694 corresponds to this symbol. This is the index of this symbol
3695 in all the symbols for which we are making plt entries. The
3696 first entry in the procedure linkage table is reserved. */
3697 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3698
3699 /* Get the offset into the .got table of the entry that
3700 corresponds to this function. Each .got entry is 4 bytes.
3701 The first three are reserved. */
3702 got_offset = (plt_index + 3) * 4;
3703
3704 /* Fill in the entry in the procedure linkage table. */
3705 if (! info->shared)
3706 {
3707 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3708 PLT_ENTRY_SIZE);
3709 bfd_put_32 (output_bfd,
3710 (htab->sgotplt->output_section->vma
3711 + htab->sgotplt->output_offset
3712 + got_offset),
3713 htab->splt->contents + h->plt.offset + 2);
3714
3715 if (htab->is_vxworks)
3716 {
3717 int s, k, reloc_index;
3718
3719 /* Create the R_386_32 relocation referencing the GOT
3720 for this PLT entry. */
3721
3722 /* S: Current slot number (zero-based). */
3723 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3724 /* K: Number of relocations for PLTResolve. */
3725 if (info->shared)
3726 k = PLTRESOLVE_RELOCS_SHLIB;
3727 else
3728 k = PLTRESOLVE_RELOCS;
3729 /* Skip the PLTresolve relocations, and the relocations for
3730 the other PLT slots. */
3731 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3732 loc = (htab->srelplt2->contents + reloc_index
3733 * sizeof (Elf32_External_Rel));
3734
3735 rel.r_offset = (htab->splt->output_section->vma
3736 + htab->splt->output_offset
3737 + h->plt.offset + 2),
3738 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3739 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3740
3741 /* Create the R_386_32 relocation referencing the beginning of
3742 the PLT for this GOT entry. */
3743 rel.r_offset = (htab->sgotplt->output_section->vma
3744 + htab->sgotplt->output_offset
3745 + got_offset);
3746 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3747 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3748 loc + sizeof (Elf32_External_Rel));
3749 }
3750 }
3751 else
3752 {
3753 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3754 PLT_ENTRY_SIZE);
3755 bfd_put_32 (output_bfd, got_offset,
3756 htab->splt->contents + h->plt.offset + 2);
3757 }
3758
3759 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3760 htab->splt->contents + h->plt.offset + 7);
3761 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3762 htab->splt->contents + h->plt.offset + 12);
3763
3764 /* Fill in the entry in the global offset table. */
3765 bfd_put_32 (output_bfd,
3766 (htab->splt->output_section->vma
3767 + htab->splt->output_offset
3768 + h->plt.offset
3769 + 6),
3770 htab->sgotplt->contents + got_offset);
3771
3772 /* Fill in the entry in the .rel.plt section. */
3773 rel.r_offset = (htab->sgotplt->output_section->vma
3774 + htab->sgotplt->output_offset
3775 + got_offset);
3776 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3777 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3778 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3779
3780 if (!h->def_regular)
3781 {
3782 /* Mark the symbol as undefined, rather than as defined in
3783 the .plt section. Leave the value if there were any
3784 relocations where pointer equality matters (this is a clue
3785 for the dynamic linker, to make function pointer
3786 comparisons work between an application and shared
3787 library), otherwise set it to zero. If a function is only
3788 called from a binary, there is no need to slow down
3789 shared libraries because of that. */
3790 sym->st_shndx = SHN_UNDEF;
3791 if (!h->pointer_equality_needed)
3792 sym->st_value = 0;
3793 }
3794 }
3795
3796 if (h->got.offset != (bfd_vma) -1
3797 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
3798 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3799 {
3800 Elf_Internal_Rela rel;
3801 bfd_byte *loc;
3802
3803 /* This symbol has an entry in the global offset table. Set it
3804 up. */
3805
3806 if (htab->sgot == NULL || htab->srelgot == NULL)
3807 abort ();
3808
3809 rel.r_offset = (htab->sgot->output_section->vma
3810 + htab->sgot->output_offset
3811 + (h->got.offset & ~(bfd_vma) 1));
3812
3813 /* If this is a static link, or it is a -Bsymbolic link and the
3814 symbol is defined locally or was forced to be local because
3815 of a version file, we just want to emit a RELATIVE reloc.
3816 The entry in the global offset table will already have been
3817 initialized in the relocate_section function. */
3818 if (info->shared
3819 && SYMBOL_REFERENCES_LOCAL (info, h))
3820 {
3821 BFD_ASSERT((h->got.offset & 1) != 0);
3822 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3823 }
3824 else
3825 {
3826 BFD_ASSERT((h->got.offset & 1) == 0);
3827 bfd_put_32 (output_bfd, (bfd_vma) 0,
3828 htab->sgot->contents + h->got.offset);
3829 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3830 }
3831
3832 loc = htab->srelgot->contents;
3833 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3834 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3835 }
3836
3837 if (h->needs_copy)
3838 {
3839 Elf_Internal_Rela rel;
3840 bfd_byte *loc;
3841
3842 /* This symbol needs a copy reloc. Set it up. */
3843
3844 if (h->dynindx == -1
3845 || (h->root.type != bfd_link_hash_defined
3846 && h->root.type != bfd_link_hash_defweak)
3847 || htab->srelbss == NULL)
3848 abort ();
3849
3850 rel.r_offset = (h->root.u.def.value
3851 + h->root.u.def.section->output_section->vma
3852 + h->root.u.def.section->output_offset);
3853 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3854 loc = htab->srelbss->contents;
3855 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3856 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3857 }
3858
3859 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3860 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3861 is relative to the ".got" section. */
3862 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3863 || (!htab->is_vxworks && h == htab->elf.hgot))
3864 sym->st_shndx = SHN_ABS;
3865
3866 return TRUE;
3867 }
3868
3869 /* Used to decide how to sort relocs in an optimal manner for the
3870 dynamic linker, before writing them out. */
3871
3872 static enum elf_reloc_type_class
3873 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3874 {
3875 switch (ELF32_R_TYPE (rela->r_info))
3876 {
3877 case R_386_RELATIVE:
3878 return reloc_class_relative;
3879 case R_386_JUMP_SLOT:
3880 return reloc_class_plt;
3881 case R_386_COPY:
3882 return reloc_class_copy;
3883 default:
3884 return reloc_class_normal;
3885 }
3886 }
3887
3888 /* Finish up the dynamic sections. */
3889
3890 static bfd_boolean
3891 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3892 struct bfd_link_info *info)
3893 {
3894 struct elf_i386_link_hash_table *htab;
3895 bfd *dynobj;
3896 asection *sdyn;
3897
3898 htab = elf_i386_hash_table (info);
3899 dynobj = htab->elf.dynobj;
3900 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3901
3902 if (htab->elf.dynamic_sections_created)
3903 {
3904 Elf32_External_Dyn *dyncon, *dynconend;
3905
3906 if (sdyn == NULL || htab->sgot == NULL)
3907 abort ();
3908
3909 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3910 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3911 for (; dyncon < dynconend; dyncon++)
3912 {
3913 Elf_Internal_Dyn dyn;
3914 asection *s;
3915
3916 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3917
3918 switch (dyn.d_tag)
3919 {
3920 default:
3921 if (htab->is_vxworks
3922 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
3923 break;
3924 continue;
3925
3926 case DT_PLTGOT:
3927 s = htab->sgotplt;
3928 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3929 break;
3930
3931 case DT_JMPREL:
3932 s = htab->srelplt;
3933 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3934 break;
3935
3936 case DT_PLTRELSZ:
3937 s = htab->srelplt;
3938 dyn.d_un.d_val = s->size;
3939 break;
3940
3941 case DT_RELSZ:
3942 /* My reading of the SVR4 ABI indicates that the
3943 procedure linkage table relocs (DT_JMPREL) should be
3944 included in the overall relocs (DT_REL). This is
3945 what Solaris does. However, UnixWare can not handle
3946 that case. Therefore, we override the DT_RELSZ entry
3947 here to make it not include the JMPREL relocs. */
3948 s = htab->srelplt;
3949 if (s == NULL)
3950 continue;
3951 dyn.d_un.d_val -= s->size;
3952 break;
3953
3954 case DT_REL:
3955 /* We may not be using the standard ELF linker script.
3956 If .rel.plt is the first .rel section, we adjust
3957 DT_REL to not include it. */
3958 s = htab->srelplt;
3959 if (s == NULL)
3960 continue;
3961 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3962 continue;
3963 dyn.d_un.d_ptr += s->size;
3964 break;
3965 }
3966
3967 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3968 }
3969
3970 /* Fill in the first entry in the procedure linkage table. */
3971 if (htab->splt && htab->splt->size > 0)
3972 {
3973 if (info->shared)
3974 {
3975 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3976 sizeof (elf_i386_pic_plt0_entry));
3977 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3978 htab->plt0_pad_byte,
3979 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3980 }
3981 else
3982 {
3983 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3984 sizeof(elf_i386_plt0_entry));
3985 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3986 htab->plt0_pad_byte,
3987 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3988 bfd_put_32 (output_bfd,
3989 (htab->sgotplt->output_section->vma
3990 + htab->sgotplt->output_offset
3991 + 4),
3992 htab->splt->contents + 2);
3993 bfd_put_32 (output_bfd,
3994 (htab->sgotplt->output_section->vma
3995 + htab->sgotplt->output_offset
3996 + 8),
3997 htab->splt->contents + 8);
3998
3999 if (htab->is_vxworks)
4000 {
4001 Elf_Internal_Rela rel;
4002
4003 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4004 On IA32 we use REL relocations so the addend goes in
4005 the PLT directly. */
4006 rel.r_offset = (htab->splt->output_section->vma
4007 + htab->splt->output_offset
4008 + 2);
4009 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4010 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4011 htab->srelplt2->contents);
4012 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4013 rel.r_offset = (htab->splt->output_section->vma
4014 + htab->splt->output_offset
4015 + 8);
4016 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4017 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4018 htab->srelplt2->contents +
4019 sizeof (Elf32_External_Rel));
4020 }
4021 }
4022
4023 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4024 really seem like the right value. */
4025 elf_section_data (htab->splt->output_section)
4026 ->this_hdr.sh_entsize = 4;
4027
4028 /* Correct the .rel.plt.unloaded relocations. */
4029 if (htab->is_vxworks && !info->shared)
4030 {
4031 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
4032 unsigned char *p;
4033
4034 p = htab->srelplt2->contents;
4035 if (info->shared)
4036 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4037 else
4038 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4039
4040 for (; num_plts; num_plts--)
4041 {
4042 Elf_Internal_Rela rel;
4043 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4044 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4045 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4046 p += sizeof (Elf32_External_Rel);
4047
4048 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4049 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4050 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4051 p += sizeof (Elf32_External_Rel);
4052 }
4053 }
4054 }
4055 }
4056
4057 if (htab->sgotplt)
4058 {
4059 /* Fill in the first three entries in the global offset table. */
4060 if (htab->sgotplt->size > 0)
4061 {
4062 bfd_put_32 (output_bfd,
4063 (sdyn == NULL ? 0
4064 : sdyn->output_section->vma + sdyn->output_offset),
4065 htab->sgotplt->contents);
4066 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
4067 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
4068 }
4069
4070 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
4071 }
4072
4073 if (htab->sgot && htab->sgot->size > 0)
4074 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
4075
4076 return TRUE;
4077 }
4078
4079 /* Return address for Ith PLT stub in section PLT, for relocation REL
4080 or (bfd_vma) -1 if it should not be included. */
4081
4082 static bfd_vma
4083 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4084 const arelent *rel ATTRIBUTE_UNUSED)
4085 {
4086 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4087 }
4088
4089 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4090
4091 static bfd_boolean
4092 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4093 {
4094 if (h->plt.offset != (bfd_vma) -1
4095 && !h->def_regular
4096 && !h->pointer_equality_needed)
4097 return FALSE;
4098
4099 return _bfd_elf_hash_symbol (h);
4100 }
4101
4102 /* Hook called by the linker routine which adds symbols from an object
4103 file. */
4104
4105 static bfd_boolean
4106 elf_i386_add_symbol_hook (bfd * abfd ATTRIBUTE_UNUSED,
4107 struct bfd_link_info * info ATTRIBUTE_UNUSED,
4108 Elf_Internal_Sym * sym,
4109 const char ** namep ATTRIBUTE_UNUSED,
4110 flagword * flagsp ATTRIBUTE_UNUSED,
4111 asection ** secp ATTRIBUTE_UNUSED,
4112 bfd_vma * valp ATTRIBUTE_UNUSED)
4113 {
4114 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4115 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4116
4117 return TRUE;
4118 }
4119
4120 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4121 #define TARGET_LITTLE_NAME "elf32-i386"
4122 #define ELF_ARCH bfd_arch_i386
4123 #define ELF_MACHINE_CODE EM_386
4124 #define ELF_MAXPAGESIZE 0x1000
4125
4126 #define elf_backend_can_gc_sections 1
4127 #define elf_backend_can_refcount 1
4128 #define elf_backend_want_got_plt 1
4129 #define elf_backend_plt_readonly 1
4130 #define elf_backend_want_plt_sym 0
4131 #define elf_backend_got_header_size 12
4132
4133 /* Support RELA for objdump of prelink objects. */
4134 #define elf_info_to_howto elf_i386_info_to_howto_rel
4135 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4136
4137 #define bfd_elf32_mkobject elf_i386_mkobject
4138
4139 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4140 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4141 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4142 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4143
4144 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4145 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4146 #define elf_backend_check_relocs elf_i386_check_relocs
4147 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4148 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4149 #define elf_backend_fake_sections elf_i386_fake_sections
4150 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4151 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4152 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4153 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4154 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4155 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4156 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4157 #define elf_backend_relocate_section elf_i386_relocate_section
4158 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4159 #define elf_backend_always_size_sections elf_i386_always_size_sections
4160 #define elf_backend_omit_section_dynsym \
4161 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4162 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4163 #define elf_backend_hash_symbol elf_i386_hash_symbol
4164 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4165 #undef elf_backend_post_process_headers
4166 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4167
4168 #include "elf32-target.h"
4169
4170 /* FreeBSD support. */
4171
4172 #undef TARGET_LITTLE_SYM
4173 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4174 #undef TARGET_LITTLE_NAME
4175 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4176 #undef ELF_OSABI
4177 #define ELF_OSABI ELFOSABI_FREEBSD
4178
4179 /* The kernel recognizes executables as valid only if they carry a
4180 "FreeBSD" label in the ELF header. So we put this label on all
4181 executables and (for simplicity) also all other object files. */
4182
4183 static void
4184 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4185 {
4186 _bfd_elf_set_osabi (abfd, info);
4187
4188 #ifdef OLD_FREEBSD_ABI_LABEL
4189 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4190 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4191 #endif
4192 }
4193
4194 #undef elf_backend_post_process_headers
4195 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4196 #undef elf32_bed
4197 #define elf32_bed elf32_i386_fbsd_bed
4198
4199 #undef elf_backend_add_symbol_hook
4200
4201 #include "elf32-target.h"
4202
4203 /* VxWorks support. */
4204
4205 #undef TARGET_LITTLE_SYM
4206 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4207 #undef TARGET_LITTLE_NAME
4208 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4209 #undef ELF_OSABI
4210
4211 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4212
4213 static struct bfd_link_hash_table *
4214 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4215 {
4216 struct bfd_link_hash_table *ret;
4217 struct elf_i386_link_hash_table *htab;
4218
4219 ret = elf_i386_link_hash_table_create (abfd);
4220 if (ret)
4221 {
4222 htab = (struct elf_i386_link_hash_table *) ret;
4223 htab->is_vxworks = 1;
4224 htab->plt0_pad_byte = 0x90;
4225 }
4226
4227 return ret;
4228 }
4229
4230
4231 #undef elf_backend_relocs_compatible
4232 #undef elf_backend_post_process_headers
4233 #undef bfd_elf32_bfd_link_hash_table_create
4234 #define bfd_elf32_bfd_link_hash_table_create \
4235 elf_i386_vxworks_link_hash_table_create
4236 #undef elf_backend_add_symbol_hook
4237 #define elf_backend_add_symbol_hook \
4238 elf_vxworks_add_symbol_hook
4239 #undef elf_backend_link_output_symbol_hook
4240 #define elf_backend_link_output_symbol_hook \
4241 elf_vxworks_link_output_symbol_hook
4242 #undef elf_backend_emit_relocs
4243 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4244 #undef elf_backend_final_write_processing
4245 #define elf_backend_final_write_processing \
4246 elf_vxworks_final_write_processing
4247
4248 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4249 define it. */
4250 #undef elf_backend_want_plt_sym
4251 #define elf_backend_want_plt_sym 1
4252
4253 #undef elf32_bed
4254 #define elf32_bed elf32_i386_vxworks_bed
4255
4256 #include "elf32-target.h"
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