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PR ld/4424
[binutils.git] / bfd / elf32-i386.c
blobe2396ce140df890d8ffb870ec815e9805eaf987f
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-vxworks.h"
28 #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 static bfd_boolean
646 elf_i386_mkobject (bfd *abfd)
647 {
648 if (abfd->tdata.any == NULL)
649 {
650 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
651 abfd->tdata.any = bfd_zalloc (abfd, amt);
652 if (abfd->tdata.any == NULL)
653 return FALSE;
654 }
655 return bfd_elf_mkobject (abfd);
656 }
657
658 /* i386 ELF linker hash table. */
659
660 struct elf_i386_link_hash_table
661 {
662 struct elf_link_hash_table elf;
663
664 /* Short-cuts to get to dynamic linker sections. */
665 asection *sgot;
666 asection *sgotplt;
667 asection *srelgot;
668 asection *splt;
669 asection *srelplt;
670 asection *sdynbss;
671 asection *srelbss;
672
673 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
674 asection *srelplt2;
675
676 /* True if the target system is VxWorks. */
677 int is_vxworks;
678
679 /* Value used to fill the last word of the first plt entry. */
680 bfd_byte plt0_pad_byte;
681
682 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
683 bfd_vma next_tls_desc_index;
684
685 union {
686 bfd_signed_vma refcount;
687 bfd_vma offset;
688 } tls_ldm_got;
689
690 /* The amount of space used by the reserved portion of the sgotplt
691 section, plus whatever space is used by the jump slots. */
692 bfd_vma sgotplt_jump_table_size;
693
694 /* Small local sym to section mapping cache. */
695 struct sym_sec_cache sym_sec;
696 };
697
698 /* Get the i386 ELF linker hash table from a link_info structure. */
699
700 #define elf_i386_hash_table(p) \
701 ((struct elf_i386_link_hash_table *) ((p)->hash))
702
703 #define elf_i386_compute_jump_table_size(htab) \
704 ((htab)->next_tls_desc_index * 4)
705
706 /* Create an entry in an i386 ELF linker hash table. */
707
708 static struct bfd_hash_entry *
709 link_hash_newfunc (struct bfd_hash_entry *entry,
710 struct bfd_hash_table *table,
711 const char *string)
712 {
713 /* Allocate the structure if it has not already been allocated by a
714 subclass. */
715 if (entry == NULL)
716 {
717 entry = bfd_hash_allocate (table,
718 sizeof (struct elf_i386_link_hash_entry));
719 if (entry == NULL)
720 return entry;
721 }
722
723 /* Call the allocation method of the superclass. */
724 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
725 if (entry != NULL)
726 {
727 struct elf_i386_link_hash_entry *eh;
728
729 eh = (struct elf_i386_link_hash_entry *) entry;
730 eh->dyn_relocs = NULL;
731 eh->tls_type = GOT_UNKNOWN;
732 eh->tlsdesc_got = (bfd_vma) -1;
733 }
734
735 return entry;
736 }
737
738 /* Create an i386 ELF linker hash table. */
739
740 static struct bfd_link_hash_table *
741 elf_i386_link_hash_table_create (bfd *abfd)
742 {
743 struct elf_i386_link_hash_table *ret;
744 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
745
746 ret = bfd_malloc (amt);
747 if (ret == NULL)
748 return NULL;
749
750 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
751 sizeof (struct elf_i386_link_hash_entry)))
752 {
753 free (ret);
754 return NULL;
755 }
756
757 ret->sgot = NULL;
758 ret->sgotplt = NULL;
759 ret->srelgot = NULL;
760 ret->splt = NULL;
761 ret->srelplt = NULL;
762 ret->sdynbss = NULL;
763 ret->srelbss = NULL;
764 ret->tls_ldm_got.refcount = 0;
765 ret->next_tls_desc_index = 0;
766 ret->sgotplt_jump_table_size = 0;
767 ret->sym_sec.abfd = NULL;
768 ret->is_vxworks = 0;
769 ret->srelplt2 = NULL;
770 ret->plt0_pad_byte = 0;
771
772 return &ret->elf.root;
773 }
774
775 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
776 shortcuts to them in our hash table. */
777
778 static bfd_boolean
779 create_got_section (bfd *dynobj, struct bfd_link_info *info)
780 {
781 struct elf_i386_link_hash_table *htab;
782
783 if (! _bfd_elf_create_got_section (dynobj, info))
784 return FALSE;
785
786 htab = elf_i386_hash_table (info);
787 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
788 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
789 if (!htab->sgot || !htab->sgotplt)
790 abort ();
791
792 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
793 (SEC_ALLOC | SEC_LOAD
794 | SEC_HAS_CONTENTS
795 | SEC_IN_MEMORY
796 | SEC_LINKER_CREATED
797 | SEC_READONLY));
798 if (htab->srelgot == NULL
799 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
800 return FALSE;
801 return TRUE;
802 }
803
804 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
805 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
806 hash table. */
807
808 static bfd_boolean
809 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
810 {
811 struct elf_i386_link_hash_table *htab;
812
813 htab = elf_i386_hash_table (info);
814 if (!htab->sgot && !create_got_section (dynobj, info))
815 return FALSE;
816
817 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
818 return FALSE;
819
820 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
821 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
822 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
823 if (!info->shared)
824 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
825
826 if (!htab->splt || !htab->srelplt || !htab->sdynbss
827 || (!info->shared && !htab->srelbss))
828 abort ();
829
830 if (htab->is_vxworks
831 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2))
832 return FALSE;
833
834 return TRUE;
835 }
836
837 /* Copy the extra info we tack onto an elf_link_hash_entry. */
838
839 static void
840 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
841 struct elf_link_hash_entry *dir,
842 struct elf_link_hash_entry *ind)
843 {
844 struct elf_i386_link_hash_entry *edir, *eind;
845
846 edir = (struct elf_i386_link_hash_entry *) dir;
847 eind = (struct elf_i386_link_hash_entry *) ind;
848
849 if (eind->dyn_relocs != NULL)
850 {
851 if (edir->dyn_relocs != NULL)
852 {
853 struct elf_i386_dyn_relocs **pp;
854 struct elf_i386_dyn_relocs *p;
855
856 /* Add reloc counts against the indirect sym to the direct sym
857 list. Merge any entries against the same section. */
858 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
859 {
860 struct elf_i386_dyn_relocs *q;
861
862 for (q = edir->dyn_relocs; q != NULL; q = q->next)
863 if (q->sec == p->sec)
864 {
865 q->pc_count += p->pc_count;
866 q->count += p->count;
867 *pp = p->next;
868 break;
869 }
870 if (q == NULL)
871 pp = &p->next;
872 }
873 *pp = edir->dyn_relocs;
874 }
875
876 edir->dyn_relocs = eind->dyn_relocs;
877 eind->dyn_relocs = NULL;
878 }
879
880 if (ind->root.type == bfd_link_hash_indirect
881 && dir->got.refcount <= 0)
882 {
883 edir->tls_type = eind->tls_type;
884 eind->tls_type = GOT_UNKNOWN;
885 }
886
887 if (ELIMINATE_COPY_RELOCS
888 && ind->root.type != bfd_link_hash_indirect
889 && dir->dynamic_adjusted)
890 {
891 /* If called to transfer flags for a weakdef during processing
892 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
893 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
894 dir->ref_dynamic |= ind->ref_dynamic;
895 dir->ref_regular |= ind->ref_regular;
896 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
897 dir->needs_plt |= ind->needs_plt;
898 dir->pointer_equality_needed |= ind->pointer_equality_needed;
899 }
900 else
901 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
902 }
903
904 typedef union
905 {
906 unsigned char c[2];
907 uint16_t i;
908 }
909 i386_opcode16;
910
911 /* Return TRUE if the TLS access code sequence support transition
912 from R_TYPE. */
913
914 static bfd_boolean
915 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
916 bfd_byte *contents,
917 Elf_Internal_Shdr *symtab_hdr,
918 struct elf_link_hash_entry **sym_hashes,
919 unsigned int r_type,
920 const Elf_Internal_Rela *rel,
921 const Elf_Internal_Rela *relend)
922 {
923 unsigned int val, type;
924 unsigned long r_symndx;
925 struct elf_link_hash_entry *h;
926 bfd_vma offset;
927
928 /* Get the section contents. */
929 if (contents == NULL)
930 {
931 if (elf_section_data (sec)->this_hdr.contents != NULL)
932 contents = elf_section_data (sec)->this_hdr.contents;
933 else
934 {
935 /* FIXME: How to better handle error condition? */
936 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
937 return FALSE;
938
939 /* Cache the section contents for elf_link_input_bfd. */
940 elf_section_data (sec)->this_hdr.contents = contents;
941 }
942 }
943
944 offset = rel->r_offset;
945 switch (r_type)
946 {
947 case R_386_TLS_GD:
948 case R_386_TLS_LDM:
949 if (offset < 2 || (rel + 1) >= relend)
950 return FALSE;
951
952 type = bfd_get_8 (abfd, contents + offset - 2);
953 if (r_type == R_386_TLS_GD)
954 {
955 /* Check transition from LD access model. Only
956 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
957 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
958 can transit to different access model. */
959 if ((offset + 10) > sec->size ||
960 (type != 0x8d && type != 0x04))
961 return FALSE;
962
963 val = bfd_get_8 (abfd, contents + offset - 1);
964 if (type == 0x04)
965 {
966 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
967 if (offset < 3)
968 return FALSE;
969
970 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
971 return FALSE;
972
973 if ((val & 0xc7) != 0x05 || val == (4 << 3))
974 return FALSE;
975 }
976 else
977 {
978 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
979 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
980 return FALSE;
981
982 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
983 return FALSE;
984 }
985 }
986 else
987 {
988 /* Check transition from LD access model. Only
989 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
990 can transit to different access model. */
991 if (type != 0x8d || (offset + 9) > sec->size)
992 return FALSE;
993
994 val = bfd_get_8 (abfd, contents + offset - 1);
995 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
996 return FALSE;
997 }
998
999 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1000 return FALSE;
1001
1002 r_symndx = ELF32_R_SYM (rel[1].r_info);
1003 if (r_symndx < symtab_hdr->sh_info)
1004 return FALSE;
1005
1006 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1007 return (h != NULL
1008 && h->root.root.string != NULL
1009 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1010 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1011 && (strcmp (h->root.root.string, "___tls_get_addr") == 0));
1012
1013 case R_386_TLS_IE:
1014 /* Check transition from IE access model:
1015 movl foo@indntpoff(%rip), %eax
1016 movl foo@indntpoff(%rip), %reg
1017 addl foo@indntpoff(%rip), %reg
1018 */
1019
1020 if (offset < 1 || (offset + 4) > sec->size)
1021 return FALSE;
1022
1023 /* Check "movl foo@tpoff(%rip), %eax" first. */
1024 val = bfd_get_8 (abfd, contents + offset - 1);
1025 if (val == 0xa1)
1026 return TRUE;
1027
1028 if (offset < 2)
1029 return FALSE;
1030
1031 /* Check movl|addl foo@tpoff(%rip), %reg. */
1032 type = bfd_get_8 (abfd, contents + offset - 2);
1033 return ((type == 0x8b || type == 0x03)
1034 && (val & 0xc7) == 0x05);
1035
1036 case R_386_TLS_GOTIE:
1037 case R_386_TLS_IE_32:
1038 /* Check transition from {IE_32,GOTIE} access model:
1039 subl foo@{tpoff,gontoff}(%reg1), %reg2
1040 movl foo@{tpoff,gontoff}(%reg1), %reg2
1041 addl foo@{tpoff,gontoff}(%reg1), %reg2
1042 */
1043
1044 if (offset < 2 || (offset + 4) > sec->size)
1045 return FALSE;
1046
1047 val = bfd_get_8 (abfd, contents + offset - 1);
1048 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1049 return FALSE;
1050
1051 type = bfd_get_8 (abfd, contents + offset - 2);
1052 return type == 0x8b || type == 0x2b || type == 0x03;
1053
1054 case R_386_TLS_GOTDESC:
1055 /* Check transition from GDesc access model:
1056 leal x@tlsdesc(%ebx), %eax
1057
1058 Make sure it's a leal adding ebx to a 32-bit offset
1059 into any register, although it's probably almost always
1060 going to be eax. */
1061
1062 if (offset < 2 || (offset + 4) > sec->size)
1063 return FALSE;
1064
1065 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1066 return FALSE;
1067
1068 val = bfd_get_8 (abfd, contents + offset - 1);
1069 return (val & 0xc7) == 0x83;
1070
1071 case R_386_TLS_DESC_CALL:
1072 /* Check transition from GDesc access model:
1073 call *x@tlsdesc(%rax)
1074 */
1075 if (offset + 2 <= sec->size)
1076 {
1077 /* Make sure that it's a call *x@tlsdesc(%rax). */
1078 static i386_opcode16 call = { { 0xff, 0x10 } };
1079 return bfd_get_16 (abfd, contents + offset) == call.i;
1080 }
1081
1082 return FALSE;
1083
1084 default:
1085 abort ();
1086 }
1087 }
1088
1089 /* Return TRUE if the TLS access transition is OK or no transition
1090 will be performed. Update R_TYPE if there is a transition. */
1091
1092 static bfd_boolean
1093 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1094 asection *sec, bfd_byte *contents,
1095 Elf_Internal_Shdr *symtab_hdr,
1096 struct elf_link_hash_entry **sym_hashes,
1097 unsigned int *r_type, int tls_type,
1098 const Elf_Internal_Rela *rel,
1099 const Elf_Internal_Rela *relend,
1100 struct elf_link_hash_entry *h)
1101 {
1102 unsigned int from_type = *r_type;
1103 unsigned int to_type = from_type;
1104 bfd_boolean check = TRUE;
1105
1106 switch (from_type)
1107 {
1108 case R_386_TLS_GD:
1109 case R_386_TLS_GOTDESC:
1110 case R_386_TLS_DESC_CALL:
1111 case R_386_TLS_IE_32:
1112 case R_386_TLS_IE:
1113 case R_386_TLS_GOTIE:
1114 if (!info->shared)
1115 {
1116 if (h == NULL)
1117 to_type = R_386_TLS_LE_32;
1118 else if (from_type != R_386_TLS_IE
1119 && from_type != R_386_TLS_GOTIE)
1120 to_type = R_386_TLS_IE_32;
1121 }
1122
1123 /* When we are called from elf_i386_relocate_section, CONTENTS
1124 isn't NULL and there may be additional transitions based on
1125 TLS_TYPE. */
1126 if (contents != NULL)
1127 {
1128 unsigned int new_to_type = to_type;
1129
1130 if (!info->shared
1131 && h != NULL
1132 && h->dynindx == -1
1133 && (tls_type & GOT_TLS_IE))
1134 new_to_type = R_386_TLS_LE_32;
1135
1136 if (to_type == R_386_TLS_GD
1137 || to_type == R_386_TLS_GOTDESC
1138 || to_type == R_386_TLS_DESC_CALL)
1139 {
1140 if (tls_type == GOT_TLS_IE_POS)
1141 new_to_type = R_386_TLS_GOTIE;
1142 else if (tls_type & GOT_TLS_IE)
1143 new_to_type = R_386_TLS_IE_32;
1144 }
1145
1146 /* We checked the transition before when we were called from
1147 elf_i386_check_relocs. We only want to check the new
1148 transition which hasn't been checked before. */
1149 check = new_to_type != to_type && from_type == to_type;
1150 to_type = new_to_type;
1151 }
1152
1153 break;
1154
1155 case R_386_TLS_LDM:
1156 if (!info->shared)
1157 to_type = R_386_TLS_LE_32;
1158 break;
1159
1160 default:
1161 return TRUE;
1162 }
1163
1164 /* Return TRUE if there is no transition. */
1165 if (from_type == to_type)
1166 return TRUE;
1167
1168 /* Check if the transition can be performed. */
1169 if (check
1170 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1171 symtab_hdr, sym_hashes,
1172 from_type, rel, relend))
1173 {
1174 reloc_howto_type *from, *to;
1175
1176 from = elf_i386_rtype_to_howto (abfd, from_type);
1177 to = elf_i386_rtype_to_howto (abfd, to_type);
1178
1179 (*_bfd_error_handler)
1180 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1181 "in section `%A' failed"),
1182 abfd, sec, from->name, to->name,
1183 h ? h->root.root.string : "a local symbol",
1184 (unsigned long) rel->r_offset);
1185 bfd_set_error (bfd_error_bad_value);
1186 return FALSE;
1187 }
1188
1189 *r_type = to_type;
1190 return TRUE;
1191 }
1192
1193 /* Look through the relocs for a section during the first phase, and
1194 calculate needed space in the global offset table, procedure linkage
1195 table, and dynamic reloc sections. */
1196
1197 static bfd_boolean
1198 elf_i386_check_relocs (bfd *abfd,
1199 struct bfd_link_info *info,
1200 asection *sec,
1201 const Elf_Internal_Rela *relocs)
1202 {
1203 struct elf_i386_link_hash_table *htab;
1204 Elf_Internal_Shdr *symtab_hdr;
1205 struct elf_link_hash_entry **sym_hashes;
1206 const Elf_Internal_Rela *rel;
1207 const Elf_Internal_Rela *rel_end;
1208 asection *sreloc;
1209
1210 if (info->relocatable)
1211 return TRUE;
1212
1213 htab = elf_i386_hash_table (info);
1214 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1215 sym_hashes = elf_sym_hashes (abfd);
1216
1217 sreloc = NULL;
1218
1219 rel_end = relocs + sec->reloc_count;
1220 for (rel = relocs; rel < rel_end; rel++)
1221 {
1222 unsigned int r_type;
1223 unsigned long r_symndx;
1224 struct elf_link_hash_entry *h;
1225
1226 r_symndx = ELF32_R_SYM (rel->r_info);
1227 r_type = ELF32_R_TYPE (rel->r_info);
1228
1229 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1230 {
1231 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1232 abfd,
1233 r_symndx);
1234 return FALSE;
1235 }
1236
1237 if (r_symndx < symtab_hdr->sh_info)
1238 h = NULL;
1239 else
1240 {
1241 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1242 while (h->root.type == bfd_link_hash_indirect
1243 || h->root.type == bfd_link_hash_warning)
1244 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1245 }
1246
1247 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1248 symtab_hdr, sym_hashes,
1249 &r_type, GOT_UNKNOWN,
1250 rel, rel_end, h))
1251 return FALSE;
1252
1253 switch (r_type)
1254 {
1255 case R_386_TLS_LDM:
1256 htab->tls_ldm_got.refcount += 1;
1257 goto create_got;
1258
1259 case R_386_PLT32:
1260 /* This symbol requires a procedure linkage table entry. We
1261 actually build the entry in adjust_dynamic_symbol,
1262 because this might be a case of linking PIC code which is
1263 never referenced by a dynamic object, in which case we
1264 don't need to generate a procedure linkage table entry
1265 after all. */
1266
1267 /* If this is a local symbol, we resolve it directly without
1268 creating a procedure linkage table entry. */
1269 if (h == NULL)
1270 continue;
1271
1272 h->needs_plt = 1;
1273 h->plt.refcount += 1;
1274 break;
1275
1276 case R_386_TLS_IE_32:
1277 case R_386_TLS_IE:
1278 case R_386_TLS_GOTIE:
1279 if (info->shared)
1280 info->flags |= DF_STATIC_TLS;
1281 /* Fall through */
1282
1283 case R_386_GOT32:
1284 case R_386_TLS_GD:
1285 case R_386_TLS_GOTDESC:
1286 case R_386_TLS_DESC_CALL:
1287 /* This symbol requires a global offset table entry. */
1288 {
1289 int tls_type, old_tls_type;
1290
1291 switch (r_type)
1292 {
1293 default:
1294 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1295 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1296 case R_386_TLS_GOTDESC:
1297 case R_386_TLS_DESC_CALL:
1298 tls_type = GOT_TLS_GDESC; break;
1299 case R_386_TLS_IE_32:
1300 if (ELF32_R_TYPE (rel->r_info) == r_type)
1301 tls_type = GOT_TLS_IE_NEG;
1302 else
1303 /* If this is a GD->IE transition, we may use either of
1304 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1305 tls_type = GOT_TLS_IE;
1306 break;
1307 case R_386_TLS_IE:
1308 case R_386_TLS_GOTIE:
1309 tls_type = GOT_TLS_IE_POS; break;
1310 }
1311
1312 if (h != NULL)
1313 {
1314 h->got.refcount += 1;
1315 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1316 }
1317 else
1318 {
1319 bfd_signed_vma *local_got_refcounts;
1320
1321 /* This is a global offset table entry for a local symbol. */
1322 local_got_refcounts = elf_local_got_refcounts (abfd);
1323 if (local_got_refcounts == NULL)
1324 {
1325 bfd_size_type size;
1326
1327 size = symtab_hdr->sh_info;
1328 size *= (sizeof (bfd_signed_vma)
1329 + sizeof (bfd_vma) + sizeof(char));
1330 local_got_refcounts = bfd_zalloc (abfd, size);
1331 if (local_got_refcounts == NULL)
1332 return FALSE;
1333 elf_local_got_refcounts (abfd) = local_got_refcounts;
1334 elf_i386_local_tlsdesc_gotent (abfd)
1335 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1336 elf_i386_local_got_tls_type (abfd)
1337 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1338 }
1339 local_got_refcounts[r_symndx] += 1;
1340 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1341 }
1342
1343 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1344 tls_type |= old_tls_type;
1345 /* If a TLS symbol is accessed using IE at least once,
1346 there is no point to use dynamic model for it. */
1347 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1348 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1349 || (tls_type & GOT_TLS_IE) == 0))
1350 {
1351 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1352 tls_type = old_tls_type;
1353 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1354 && GOT_TLS_GD_ANY_P (tls_type))
1355 tls_type |= old_tls_type;
1356 else
1357 {
1358 (*_bfd_error_handler)
1359 (_("%B: `%s' accessed both as normal and "
1360 "thread local symbol"),
1361 abfd,
1362 h ? h->root.root.string : "<local>");
1363 return FALSE;
1364 }
1365 }
1366
1367 if (old_tls_type != tls_type)
1368 {
1369 if (h != NULL)
1370 elf_i386_hash_entry (h)->tls_type = tls_type;
1371 else
1372 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1373 }
1374 }
1375 /* Fall through */
1376
1377 case R_386_GOTOFF:
1378 case R_386_GOTPC:
1379 create_got:
1380 if (htab->sgot == NULL)
1381 {
1382 if (htab->elf.dynobj == NULL)
1383 htab->elf.dynobj = abfd;
1384 if (!create_got_section (htab->elf.dynobj, info))
1385 return FALSE;
1386 }
1387 if (r_type != R_386_TLS_IE)
1388 break;
1389 /* Fall through */
1390
1391 case R_386_TLS_LE_32:
1392 case R_386_TLS_LE:
1393 if (!info->shared)
1394 break;
1395 info->flags |= DF_STATIC_TLS;
1396 /* Fall through */
1397
1398 case R_386_32:
1399 case R_386_PC32:
1400 if (h != NULL && !info->shared)
1401 {
1402 /* If this reloc is in a read-only section, we might
1403 need a copy reloc. We can't check reliably at this
1404 stage whether the section is read-only, as input
1405 sections have not yet been mapped to output sections.
1406 Tentatively set the flag for now, and correct in
1407 adjust_dynamic_symbol. */
1408 h->non_got_ref = 1;
1409
1410 /* We may need a .plt entry if the function this reloc
1411 refers to is in a shared lib. */
1412 h->plt.refcount += 1;
1413 if (r_type != R_386_PC32)
1414 h->pointer_equality_needed = 1;
1415 }
1416
1417 /* If we are creating a shared library, and this is a reloc
1418 against a global symbol, or a non PC relative reloc
1419 against a local symbol, then we need to copy the reloc
1420 into the shared library. However, if we are linking with
1421 -Bsymbolic, we do not need to copy a reloc against a
1422 global symbol which is defined in an object we are
1423 including in the link (i.e., DEF_REGULAR is set). At
1424 this point we have not seen all the input files, so it is
1425 possible that DEF_REGULAR is not set now but will be set
1426 later (it is never cleared). In case of a weak definition,
1427 DEF_REGULAR may be cleared later by a strong definition in
1428 a shared library. We account for that possibility below by
1429 storing information in the relocs_copied field of the hash
1430 table entry. A similar situation occurs when creating
1431 shared libraries and symbol visibility changes render the
1432 symbol local.
1433
1434 If on the other hand, we are creating an executable, we
1435 may need to keep relocations for symbols satisfied by a
1436 dynamic library if we manage to avoid copy relocs for the
1437 symbol. */
1438 if ((info->shared
1439 && (sec->flags & SEC_ALLOC) != 0
1440 && (r_type != R_386_PC32
1441 || (h != NULL
1442 && (! SYMBOLIC_BIND (info, h)
1443 || h->root.type == bfd_link_hash_defweak
1444 || !h->def_regular))))
1445 || (ELIMINATE_COPY_RELOCS
1446 && !info->shared
1447 && (sec->flags & SEC_ALLOC) != 0
1448 && h != NULL
1449 && (h->root.type == bfd_link_hash_defweak
1450 || !h->def_regular)))
1451 {
1452 struct elf_i386_dyn_relocs *p;
1453 struct elf_i386_dyn_relocs **head;
1454
1455 /* We must copy these reloc types into the output file.
1456 Create a reloc section in dynobj and make room for
1457 this reloc. */
1458 if (sreloc == NULL)
1459 {
1460 const char *name;
1461 bfd *dynobj;
1462 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1463 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1464
1465 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1466 if (name == NULL)
1467 return FALSE;
1468
1469 if (! CONST_STRNEQ (name, ".rel")
1470 || strcmp (bfd_get_section_name (abfd, sec),
1471 name + 4) != 0)
1472 {
1473 (*_bfd_error_handler)
1474 (_("%B: bad relocation section name `%s\'"),
1475 abfd, name);
1476 }
1477
1478 if (htab->elf.dynobj == NULL)
1479 htab->elf.dynobj = abfd;
1480
1481 dynobj = htab->elf.dynobj;
1482 sreloc = bfd_get_section_by_name (dynobj, name);
1483 if (sreloc == NULL)
1484 {
1485 flagword flags;
1486
1487 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1488 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1489 if ((sec->flags & SEC_ALLOC) != 0)
1490 flags |= SEC_ALLOC | SEC_LOAD;
1491 sreloc = bfd_make_section_with_flags (dynobj,
1492 name,
1493 flags);
1494 if (sreloc == NULL
1495 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1496 return FALSE;
1497 }
1498 elf_section_data (sec)->sreloc = sreloc;
1499 }
1500
1501 /* If this is a global symbol, we count the number of
1502 relocations we need for this symbol. */
1503 if (h != NULL)
1504 {
1505 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1506 }
1507 else
1508 {
1509 void **vpp;
1510 /* Track dynamic relocs needed for local syms too.
1511 We really need local syms available to do this
1512 easily. Oh well. */
1513
1514 asection *s;
1515 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1516 sec, r_symndx);
1517 if (s == NULL)
1518 return FALSE;
1519
1520 vpp = &elf_section_data (s)->local_dynrel;
1521 head = (struct elf_i386_dyn_relocs **)vpp;
1522 }
1523
1524 p = *head;
1525 if (p == NULL || p->sec != sec)
1526 {
1527 bfd_size_type amt = sizeof *p;
1528 p = bfd_alloc (htab->elf.dynobj, amt);
1529 if (p == NULL)
1530 return FALSE;
1531 p->next = *head;
1532 *head = p;
1533 p->sec = sec;
1534 p->count = 0;
1535 p->pc_count = 0;
1536 }
1537
1538 p->count += 1;
1539 if (r_type == R_386_PC32)
1540 p->pc_count += 1;
1541 }
1542 break;
1543
1544 /* This relocation describes the C++ object vtable hierarchy.
1545 Reconstruct it for later use during GC. */
1546 case R_386_GNU_VTINHERIT:
1547 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1548 return FALSE;
1549 break;
1550
1551 /* This relocation describes which C++ vtable entries are actually
1552 used. Record for later use during GC. */
1553 case R_386_GNU_VTENTRY:
1554 BFD_ASSERT (h != NULL);
1555 if (h != NULL
1556 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1557 return FALSE;
1558 break;
1559
1560 default:
1561 break;
1562 }
1563 }
1564
1565 return TRUE;
1566 }
1567
1568 /* Return the section that should be marked against GC for a given
1569 relocation. */
1570
1571 static asection *
1572 elf_i386_gc_mark_hook (asection *sec,
1573 struct bfd_link_info *info,
1574 Elf_Internal_Rela *rel,
1575 struct elf_link_hash_entry *h,
1576 Elf_Internal_Sym *sym)
1577 {
1578 if (h != NULL)
1579 switch (ELF32_R_TYPE (rel->r_info))
1580 {
1581 case R_386_GNU_VTINHERIT:
1582 case R_386_GNU_VTENTRY:
1583 return NULL;
1584 }
1585
1586 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1587 }
1588
1589 /* Update the got entry reference counts for the section being removed. */
1590
1591 static bfd_boolean
1592 elf_i386_gc_sweep_hook (bfd *abfd,
1593 struct bfd_link_info *info,
1594 asection *sec,
1595 const Elf_Internal_Rela *relocs)
1596 {
1597 Elf_Internal_Shdr *symtab_hdr;
1598 struct elf_link_hash_entry **sym_hashes;
1599 bfd_signed_vma *local_got_refcounts;
1600 const Elf_Internal_Rela *rel, *relend;
1601
1602 elf_section_data (sec)->local_dynrel = NULL;
1603
1604 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1605 sym_hashes = elf_sym_hashes (abfd);
1606 local_got_refcounts = elf_local_got_refcounts (abfd);
1607
1608 relend = relocs + sec->reloc_count;
1609 for (rel = relocs; rel < relend; rel++)
1610 {
1611 unsigned long r_symndx;
1612 unsigned int r_type;
1613 struct elf_link_hash_entry *h = NULL;
1614
1615 r_symndx = ELF32_R_SYM (rel->r_info);
1616 if (r_symndx >= symtab_hdr->sh_info)
1617 {
1618 struct elf_i386_link_hash_entry *eh;
1619 struct elf_i386_dyn_relocs **pp;
1620 struct elf_i386_dyn_relocs *p;
1621
1622 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1623 while (h->root.type == bfd_link_hash_indirect
1624 || h->root.type == bfd_link_hash_warning)
1625 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1626 eh = (struct elf_i386_link_hash_entry *) h;
1627
1628 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1629 if (p->sec == sec)
1630 {
1631 /* Everything must go for SEC. */
1632 *pp = p->next;
1633 break;
1634 }
1635 }
1636
1637 r_type = ELF32_R_TYPE (rel->r_info);
1638 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1639 symtab_hdr, sym_hashes,
1640 &r_type, GOT_UNKNOWN,
1641 rel, relend, h))
1642 return FALSE;
1643
1644 switch (r_type)
1645 {
1646 case R_386_TLS_LDM:
1647 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1648 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1649 break;
1650
1651 case R_386_TLS_GD:
1652 case R_386_TLS_GOTDESC:
1653 case R_386_TLS_DESC_CALL:
1654 case R_386_TLS_IE_32:
1655 case R_386_TLS_IE:
1656 case R_386_TLS_GOTIE:
1657 case R_386_GOT32:
1658 if (h != NULL)
1659 {
1660 if (h->got.refcount > 0)
1661 h->got.refcount -= 1;
1662 }
1663 else if (local_got_refcounts != NULL)
1664 {
1665 if (local_got_refcounts[r_symndx] > 0)
1666 local_got_refcounts[r_symndx] -= 1;
1667 }
1668 break;
1669
1670 case R_386_32:
1671 case R_386_PC32:
1672 if (info->shared)
1673 break;
1674 /* Fall through */
1675
1676 case R_386_PLT32:
1677 if (h != NULL)
1678 {
1679 if (h->plt.refcount > 0)
1680 h->plt.refcount -= 1;
1681 }
1682 break;
1683
1684 default:
1685 break;
1686 }
1687 }
1688
1689 return TRUE;
1690 }
1691
1692 /* Adjust a symbol defined by a dynamic object and referenced by a
1693 regular object. The current definition is in some section of the
1694 dynamic object, but we're not including those sections. We have to
1695 change the definition to something the rest of the link can
1696 understand. */
1697
1698 static bfd_boolean
1699 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1700 struct elf_link_hash_entry *h)
1701 {
1702 struct elf_i386_link_hash_table *htab;
1703 asection *s;
1704
1705 /* If this is a function, put it in the procedure linkage table. We
1706 will fill in the contents of the procedure linkage table later,
1707 when we know the address of the .got section. */
1708 if (h->type == STT_FUNC
1709 || h->needs_plt)
1710 {
1711 if (h->plt.refcount <= 0
1712 || SYMBOL_CALLS_LOCAL (info, h)
1713 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1714 && h->root.type == bfd_link_hash_undefweak))
1715 {
1716 /* This case can occur if we saw a PLT32 reloc in an input
1717 file, but the symbol was never referred to by a dynamic
1718 object, or if all references were garbage collected. In
1719 such a case, we don't actually need to build a procedure
1720 linkage table, and we can just do a PC32 reloc instead. */
1721 h->plt.offset = (bfd_vma) -1;
1722 h->needs_plt = 0;
1723 }
1724
1725 return TRUE;
1726 }
1727 else
1728 /* It's possible that we incorrectly decided a .plt reloc was
1729 needed for an R_386_PC32 reloc to a non-function sym in
1730 check_relocs. We can't decide accurately between function and
1731 non-function syms in check-relocs; Objects loaded later in
1732 the link may change h->type. So fix it now. */
1733 h->plt.offset = (bfd_vma) -1;
1734
1735 /* If this is a weak symbol, and there is a real definition, the
1736 processor independent code will have arranged for us to see the
1737 real definition first, and we can just use the same value. */
1738 if (h->u.weakdef != NULL)
1739 {
1740 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1741 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1742 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1743 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1744 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1745 h->non_got_ref = h->u.weakdef->non_got_ref;
1746 return TRUE;
1747 }
1748
1749 /* This is a reference to a symbol defined by a dynamic object which
1750 is not a function. */
1751
1752 /* If we are creating a shared library, we must presume that the
1753 only references to the symbol are via the global offset table.
1754 For such cases we need not do anything here; the relocations will
1755 be handled correctly by relocate_section. */
1756 if (info->shared)
1757 return TRUE;
1758
1759 /* If there are no references to this symbol that do not use the
1760 GOT, we don't need to generate a copy reloc. */
1761 if (!h->non_got_ref)
1762 return TRUE;
1763
1764 /* If -z nocopyreloc was given, we won't generate them either. */
1765 if (info->nocopyreloc)
1766 {
1767 h->non_got_ref = 0;
1768 return TRUE;
1769 }
1770
1771 htab = elf_i386_hash_table (info);
1772
1773 /* If there aren't any dynamic relocs in read-only sections, then
1774 we can keep the dynamic relocs and avoid the copy reloc. This
1775 doesn't work on VxWorks, where we can not have dynamic relocations
1776 (other than copy and jump slot relocations) in an executable. */
1777 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1778 {
1779 struct elf_i386_link_hash_entry * eh;
1780 struct elf_i386_dyn_relocs *p;
1781
1782 eh = (struct elf_i386_link_hash_entry *) h;
1783 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1784 {
1785 s = p->sec->output_section;
1786 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1787 break;
1788 }
1789
1790 if (p == NULL)
1791 {
1792 h->non_got_ref = 0;
1793 return TRUE;
1794 }
1795 }
1796
1797 if (h->size == 0)
1798 {
1799 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1800 h->root.root.string);
1801 return TRUE;
1802 }
1803
1804 /* We must allocate the symbol in our .dynbss section, which will
1805 become part of the .bss section of the executable. There will be
1806 an entry for this symbol in the .dynsym section. The dynamic
1807 object will contain position independent code, so all references
1808 from the dynamic object to this symbol will go through the global
1809 offset table. The dynamic linker will use the .dynsym entry to
1810 determine the address it must put in the global offset table, so
1811 both the dynamic object and the regular object will refer to the
1812 same memory location for the variable. */
1813
1814 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1815 copy the initial value out of the dynamic object and into the
1816 runtime process image. */
1817 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1818 {
1819 htab->srelbss->size += sizeof (Elf32_External_Rel);
1820 h->needs_copy = 1;
1821 }
1822
1823 s = htab->sdynbss;
1824
1825 return _bfd_elf_adjust_dynamic_copy (h, s);
1826 }
1827
1828 /* Allocate space in .plt, .got and associated reloc sections for
1829 dynamic relocs. */
1830
1831 static bfd_boolean
1832 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1833 {
1834 struct bfd_link_info *info;
1835 struct elf_i386_link_hash_table *htab;
1836 struct elf_i386_link_hash_entry *eh;
1837 struct elf_i386_dyn_relocs *p;
1838
1839 if (h->root.type == bfd_link_hash_indirect)
1840 return TRUE;
1841
1842 if (h->root.type == bfd_link_hash_warning)
1843 /* When warning symbols are created, they **replace** the "real"
1844 entry in the hash table, thus we never get to see the real
1845 symbol in a hash traversal. So look at it now. */
1846 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1847
1848 info = (struct bfd_link_info *) inf;
1849 htab = elf_i386_hash_table (info);
1850
1851 if (htab->elf.dynamic_sections_created
1852 && h->plt.refcount > 0)
1853 {
1854 /* Make sure this symbol is output as a dynamic symbol.
1855 Undefined weak syms won't yet be marked as dynamic. */
1856 if (h->dynindx == -1
1857 && !h->forced_local)
1858 {
1859 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1860 return FALSE;
1861 }
1862
1863 if (info->shared
1864 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1865 {
1866 asection *s = htab->splt;
1867
1868 /* If this is the first .plt entry, make room for the special
1869 first entry. */
1870 if (s->size == 0)
1871 s->size += PLT_ENTRY_SIZE;
1872
1873 h->plt.offset = s->size;
1874
1875 /* If this symbol is not defined in a regular file, and we are
1876 not generating a shared library, then set the symbol to this
1877 location in the .plt. This is required to make function
1878 pointers compare as equal between the normal executable and
1879 the shared library. */
1880 if (! info->shared
1881 && !h->def_regular)
1882 {
1883 h->root.u.def.section = s;
1884 h->root.u.def.value = h->plt.offset;
1885 }
1886
1887 /* Make room for this entry. */
1888 s->size += PLT_ENTRY_SIZE;
1889
1890 /* We also need to make an entry in the .got.plt section, which
1891 will be placed in the .got section by the linker script. */
1892 htab->sgotplt->size += 4;
1893
1894 /* We also need to make an entry in the .rel.plt section. */
1895 htab->srelplt->size += sizeof (Elf32_External_Rel);
1896 htab->next_tls_desc_index++;
1897
1898 if (htab->is_vxworks && !info->shared)
1899 {
1900 /* VxWorks has a second set of relocations for each PLT entry
1901 in executables. They go in a separate relocation section,
1902 which is processed by the kernel loader. */
1903
1904 /* There are two relocations for the initial PLT entry: an
1905 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1906 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1907
1908 if (h->plt.offset == PLT_ENTRY_SIZE)
1909 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1910
1911 /* There are two extra relocations for each subsequent PLT entry:
1912 an R_386_32 relocation for the GOT entry, and an R_386_32
1913 relocation for the PLT entry. */
1914
1915 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1916 }
1917 }
1918 else
1919 {
1920 h->plt.offset = (bfd_vma) -1;
1921 h->needs_plt = 0;
1922 }
1923 }
1924 else
1925 {
1926 h->plt.offset = (bfd_vma) -1;
1927 h->needs_plt = 0;
1928 }
1929
1930 eh = (struct elf_i386_link_hash_entry *) h;
1931 eh->tlsdesc_got = (bfd_vma) -1;
1932
1933 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1934 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1935 if (h->got.refcount > 0
1936 && !info->shared
1937 && h->dynindx == -1
1938 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1939 h->got.offset = (bfd_vma) -1;
1940 else if (h->got.refcount > 0)
1941 {
1942 asection *s;
1943 bfd_boolean dyn;
1944 int tls_type = elf_i386_hash_entry(h)->tls_type;
1945
1946 /* Make sure this symbol is output as a dynamic symbol.
1947 Undefined weak syms won't yet be marked as dynamic. */
1948 if (h->dynindx == -1
1949 && !h->forced_local)
1950 {
1951 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1952 return FALSE;
1953 }
1954
1955 s = htab->sgot;
1956 if (GOT_TLS_GDESC_P (tls_type))
1957 {
1958 eh->tlsdesc_got = htab->sgotplt->size
1959 - elf_i386_compute_jump_table_size (htab);
1960 htab->sgotplt->size += 8;
1961 h->got.offset = (bfd_vma) -2;
1962 }
1963 if (! GOT_TLS_GDESC_P (tls_type)
1964 || GOT_TLS_GD_P (tls_type))
1965 {
1966 h->got.offset = s->size;
1967 s->size += 4;
1968 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1969 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
1970 s->size += 4;
1971 }
1972 dyn = htab->elf.dynamic_sections_created;
1973 /* R_386_TLS_IE_32 needs one dynamic relocation,
1974 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1975 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1976 need two), R_386_TLS_GD needs one if local symbol and two if
1977 global. */
1978 if (tls_type == GOT_TLS_IE_BOTH)
1979 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1980 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1981 || (tls_type & GOT_TLS_IE))
1982 htab->srelgot->size += sizeof (Elf32_External_Rel);
1983 else if (GOT_TLS_GD_P (tls_type))
1984 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1985 else if (! GOT_TLS_GDESC_P (tls_type)
1986 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1987 || h->root.type != bfd_link_hash_undefweak)
1988 && (info->shared
1989 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1990 htab->srelgot->size += sizeof (Elf32_External_Rel);
1991 if (GOT_TLS_GDESC_P (tls_type))
1992 htab->srelplt->size += sizeof (Elf32_External_Rel);
1993 }
1994 else
1995 h->got.offset = (bfd_vma) -1;
1996
1997 if (eh->dyn_relocs == NULL)
1998 return TRUE;
1999
2000 /* In the shared -Bsymbolic case, discard space allocated for
2001 dynamic pc-relative relocs against symbols which turn out to be
2002 defined in regular objects. For the normal shared case, discard
2003 space for pc-relative relocs that have become local due to symbol
2004 visibility changes. */
2005
2006 if (info->shared)
2007 {
2008 /* The only reloc that uses pc_count is R_386_PC32, which will
2009 appear on a call or on something like ".long foo - .". We
2010 want calls to protected symbols to resolve directly to the
2011 function rather than going via the plt. If people want
2012 function pointer comparisons to work as expected then they
2013 should avoid writing assembly like ".long foo - .". */
2014 if (SYMBOL_CALLS_LOCAL (info, h))
2015 {
2016 struct elf_i386_dyn_relocs **pp;
2017
2018 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2019 {
2020 p->count -= p->pc_count;
2021 p->pc_count = 0;
2022 if (p->count == 0)
2023 *pp = p->next;
2024 else
2025 pp = &p->next;
2026 }
2027 }
2028
2029 /* Also discard relocs on undefined weak syms with non-default
2030 visibility. */
2031 if (eh->dyn_relocs != NULL
2032 && h->root.type == bfd_link_hash_undefweak)
2033 {
2034 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2035 eh->dyn_relocs = NULL;
2036
2037 /* Make sure undefined weak symbols are output as a dynamic
2038 symbol in PIEs. */
2039 else if (h->dynindx == -1
2040 && !h->forced_local)
2041 {
2042 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2043 return FALSE;
2044 }
2045 }
2046 }
2047 else if (ELIMINATE_COPY_RELOCS)
2048 {
2049 /* For the non-shared case, discard space for relocs against
2050 symbols which turn out to need copy relocs or are not
2051 dynamic. */
2052
2053 if (!h->non_got_ref
2054 && ((h->def_dynamic
2055 && !h->def_regular)
2056 || (htab->elf.dynamic_sections_created
2057 && (h->root.type == bfd_link_hash_undefweak
2058 || h->root.type == bfd_link_hash_undefined))))
2059 {
2060 /* Make sure this symbol is output as a dynamic symbol.
2061 Undefined weak syms won't yet be marked as dynamic. */
2062 if (h->dynindx == -1
2063 && !h->forced_local)
2064 {
2065 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2066 return FALSE;
2067 }
2068
2069 /* If that succeeded, we know we'll be keeping all the
2070 relocs. */
2071 if (h->dynindx != -1)
2072 goto keep;
2073 }
2074
2075 eh->dyn_relocs = NULL;
2076
2077 keep: ;
2078 }
2079
2080 /* Finally, allocate space. */
2081 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2082 {
2083 asection *sreloc = elf_section_data (p->sec)->sreloc;
2084 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2085 }
2086
2087 return TRUE;
2088 }
2089
2090 /* Find any dynamic relocs that apply to read-only sections. */
2091
2092 static bfd_boolean
2093 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2094 {
2095 struct elf_i386_link_hash_entry *eh;
2096 struct elf_i386_dyn_relocs *p;
2097
2098 if (h->root.type == bfd_link_hash_warning)
2099 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2100
2101 eh = (struct elf_i386_link_hash_entry *) h;
2102 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2103 {
2104 asection *s = p->sec->output_section;
2105
2106 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2107 {
2108 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2109
2110 info->flags |= DF_TEXTREL;
2111
2112 /* Not an error, just cut short the traversal. */
2113 return FALSE;
2114 }
2115 }
2116 return TRUE;
2117 }
2118
2119 /* Set the sizes of the dynamic sections. */
2120
2121 static bfd_boolean
2122 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2123 struct bfd_link_info *info)
2124 {
2125 struct elf_i386_link_hash_table *htab;
2126 bfd *dynobj;
2127 asection *s;
2128 bfd_boolean relocs;
2129 bfd *ibfd;
2130
2131 htab = elf_i386_hash_table (info);
2132 dynobj = htab->elf.dynobj;
2133 if (dynobj == NULL)
2134 abort ();
2135
2136 if (htab->elf.dynamic_sections_created)
2137 {
2138 /* Set the contents of the .interp section to the interpreter. */
2139 if (info->executable)
2140 {
2141 s = bfd_get_section_by_name (dynobj, ".interp");
2142 if (s == NULL)
2143 abort ();
2144 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2145 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2146 }
2147 }
2148
2149 /* Set up .got offsets for local syms, and space for local dynamic
2150 relocs. */
2151 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2152 {
2153 bfd_signed_vma *local_got;
2154 bfd_signed_vma *end_local_got;
2155 char *local_tls_type;
2156 bfd_vma *local_tlsdesc_gotent;
2157 bfd_size_type locsymcount;
2158 Elf_Internal_Shdr *symtab_hdr;
2159 asection *srel;
2160
2161 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
2162 continue;
2163
2164 for (s = ibfd->sections; s != NULL; s = s->next)
2165 {
2166 struct elf_i386_dyn_relocs *p;
2167
2168 for (p = ((struct elf_i386_dyn_relocs *)
2169 elf_section_data (s)->local_dynrel);
2170 p != NULL;
2171 p = p->next)
2172 {
2173 if (!bfd_is_abs_section (p->sec)
2174 && bfd_is_abs_section (p->sec->output_section))
2175 {
2176 /* Input section has been discarded, either because
2177 it is a copy of a linkonce section or due to
2178 linker script /DISCARD/, so we'll be discarding
2179 the relocs too. */
2180 }
2181 else if (p->count != 0)
2182 {
2183 srel = elf_section_data (p->sec)->sreloc;
2184 srel->size += p->count * sizeof (Elf32_External_Rel);
2185 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2186 info->flags |= DF_TEXTREL;
2187 }
2188 }
2189 }
2190
2191 local_got = elf_local_got_refcounts (ibfd);
2192 if (!local_got)
2193 continue;
2194
2195 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
2196 locsymcount = symtab_hdr->sh_info;
2197 end_local_got = local_got + locsymcount;
2198 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2199 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2200 s = htab->sgot;
2201 srel = htab->srelgot;
2202 for (; local_got < end_local_got;
2203 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2204 {
2205 *local_tlsdesc_gotent = (bfd_vma) -1;
2206 if (*local_got > 0)
2207 {
2208 if (GOT_TLS_GDESC_P (*local_tls_type))
2209 {
2210 *local_tlsdesc_gotent = htab->sgotplt->size
2211 - elf_i386_compute_jump_table_size (htab);
2212 htab->sgotplt->size += 8;
2213 *local_got = (bfd_vma) -2;
2214 }
2215 if (! GOT_TLS_GDESC_P (*local_tls_type)
2216 || GOT_TLS_GD_P (*local_tls_type))
2217 {
2218 *local_got = s->size;
2219 s->size += 4;
2220 if (GOT_TLS_GD_P (*local_tls_type)
2221 || *local_tls_type == GOT_TLS_IE_BOTH)
2222 s->size += 4;
2223 }
2224 if (info->shared
2225 || GOT_TLS_GD_ANY_P (*local_tls_type)
2226 || (*local_tls_type & GOT_TLS_IE))
2227 {
2228 if (*local_tls_type == GOT_TLS_IE_BOTH)
2229 srel->size += 2 * sizeof (Elf32_External_Rel);
2230 else if (GOT_TLS_GD_P (*local_tls_type)
2231 || ! GOT_TLS_GDESC_P (*local_tls_type))
2232 srel->size += sizeof (Elf32_External_Rel);
2233 if (GOT_TLS_GDESC_P (*local_tls_type))
2234 htab->srelplt->size += sizeof (Elf32_External_Rel);
2235 }
2236 }
2237 else
2238 *local_got = (bfd_vma) -1;
2239 }
2240 }
2241
2242 if (htab->tls_ldm_got.refcount > 0)
2243 {
2244 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2245 relocs. */
2246 htab->tls_ldm_got.offset = htab->sgot->size;
2247 htab->sgot->size += 8;
2248 htab->srelgot->size += sizeof (Elf32_External_Rel);
2249 }
2250 else
2251 htab->tls_ldm_got.offset = -1;
2252
2253 /* Allocate global sym .plt and .got entries, and space for global
2254 sym dynamic relocs. */
2255 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
2256
2257 /* For every jump slot reserved in the sgotplt, reloc_count is
2258 incremented. However, when we reserve space for TLS descriptors,
2259 it's not incremented, so in order to compute the space reserved
2260 for them, it suffices to multiply the reloc count by the jump
2261 slot size. */
2262 if (htab->srelplt)
2263 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2264
2265 /* We now have determined the sizes of the various dynamic sections.
2266 Allocate memory for them. */
2267 relocs = FALSE;
2268 for (s = dynobj->sections; s != NULL; s = s->next)
2269 {
2270 bfd_boolean strip_section = TRUE;
2271
2272 if ((s->flags & SEC_LINKER_CREATED) == 0)
2273 continue;
2274
2275 if (s == htab->splt
2276 || s == htab->sgot
2277 || s == htab->sgotplt
2278 || s == htab->sdynbss)
2279 {
2280 /* Strip this section if we don't need it; see the
2281 comment below. */
2282 /* We'd like to strip these sections if they aren't needed, but if
2283 we've exported dynamic symbols from them we must leave them.
2284 It's too late to tell BFD to get rid of the symbols. */
2285
2286 if (htab->elf.hplt != NULL)
2287 strip_section = FALSE;
2288 }
2289 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2290 {
2291 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
2292 relocs = TRUE;
2293
2294 /* We use the reloc_count field as a counter if we need
2295 to copy relocs into the output file. */
2296 s->reloc_count = 0;
2297 }
2298 else
2299 {
2300 /* It's not one of our sections, so don't allocate space. */
2301 continue;
2302 }
2303
2304 if (s->size == 0)
2305 {
2306 /* If we don't need this section, strip it from the
2307 output file. This is mostly to handle .rel.bss and
2308 .rel.plt. We must create both sections in
2309 create_dynamic_sections, because they must be created
2310 before the linker maps input sections to output
2311 sections. The linker does that before
2312 adjust_dynamic_symbol is called, and it is that
2313 function which decides whether anything needs to go
2314 into these sections. */
2315 if (strip_section)
2316 s->flags |= SEC_EXCLUDE;
2317 continue;
2318 }
2319
2320 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2321 continue;
2322
2323 /* Allocate memory for the section contents. We use bfd_zalloc
2324 here in case unused entries are not reclaimed before the
2325 section's contents are written out. This should not happen,
2326 but this way if it does, we get a R_386_NONE reloc instead
2327 of garbage. */
2328 s->contents = bfd_zalloc (dynobj, s->size);
2329 if (s->contents == NULL)
2330 return FALSE;
2331 }
2332
2333 if (htab->elf.dynamic_sections_created)
2334 {
2335 /* Add some entries to the .dynamic section. We fill in the
2336 values later, in elf_i386_finish_dynamic_sections, but we
2337 must add the entries now so that we get the correct size for
2338 the .dynamic section. The DT_DEBUG entry is filled in by the
2339 dynamic linker and used by the debugger. */
2340 #define add_dynamic_entry(TAG, VAL) \
2341 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2342
2343 if (info->executable)
2344 {
2345 if (!add_dynamic_entry (DT_DEBUG, 0))
2346 return FALSE;
2347 }
2348
2349 if (htab->splt->size != 0)
2350 {
2351 if (!add_dynamic_entry (DT_PLTGOT, 0)
2352 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2353 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2354 || !add_dynamic_entry (DT_JMPREL, 0))
2355 return FALSE;
2356 }
2357
2358 if (relocs)
2359 {
2360 if (!add_dynamic_entry (DT_REL, 0)
2361 || !add_dynamic_entry (DT_RELSZ, 0)
2362 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2363 return FALSE;
2364
2365 /* If any dynamic relocs apply to a read-only section,
2366 then we need a DT_TEXTREL entry. */
2367 if ((info->flags & DF_TEXTREL) == 0)
2368 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2369 (PTR) info);
2370
2371 if ((info->flags & DF_TEXTREL) != 0)
2372 {
2373 if (!add_dynamic_entry (DT_TEXTREL, 0))
2374 return FALSE;
2375 }
2376 }
2377 }
2378 #undef add_dynamic_entry
2379
2380 return TRUE;
2381 }
2382
2383 static bfd_boolean
2384 elf_i386_always_size_sections (bfd *output_bfd,
2385 struct bfd_link_info *info)
2386 {
2387 asection *tls_sec = elf_hash_table (info)->tls_sec;
2388
2389 if (tls_sec)
2390 {
2391 struct elf_link_hash_entry *tlsbase;
2392
2393 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2394 "_TLS_MODULE_BASE_",
2395 FALSE, FALSE, FALSE);
2396
2397 if (tlsbase && tlsbase->type == STT_TLS)
2398 {
2399 struct bfd_link_hash_entry *bh = NULL;
2400 const struct elf_backend_data *bed
2401 = get_elf_backend_data (output_bfd);
2402
2403 if (!(_bfd_generic_link_add_one_symbol
2404 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2405 tls_sec, 0, NULL, FALSE,
2406 bed->collect, &bh)))
2407 return FALSE;
2408 tlsbase = (struct elf_link_hash_entry *)bh;
2409 tlsbase->def_regular = 1;
2410 tlsbase->other = STV_HIDDEN;
2411 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2412 }
2413 }
2414
2415 return TRUE;
2416 }
2417
2418 /* Set the correct type for an x86 ELF section. We do this by the
2419 section name, which is a hack, but ought to work. */
2420
2421 static bfd_boolean
2422 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2423 Elf_Internal_Shdr *hdr,
2424 asection *sec)
2425 {
2426 register const char *name;
2427
2428 name = bfd_get_section_name (abfd, sec);
2429
2430 /* This is an ugly, but unfortunately necessary hack that is
2431 needed when producing EFI binaries on x86. It tells
2432 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2433 containing ELF relocation info. We need this hack in order to
2434 be able to generate ELF binaries that can be translated into
2435 EFI applications (which are essentially COFF objects). Those
2436 files contain a COFF ".reloc" section inside an ELFNN object,
2437 which would normally cause BFD to segfault because it would
2438 attempt to interpret this section as containing relocation
2439 entries for section "oc". With this hack enabled, ".reloc"
2440 will be treated as a normal data section, which will avoid the
2441 segfault. However, you won't be able to create an ELFNN binary
2442 with a section named "oc" that needs relocations, but that's
2443 the kind of ugly side-effects you get when detecting section
2444 types based on their names... In practice, this limitation is
2445 unlikely to bite. */
2446 if (strcmp (name, ".reloc") == 0)
2447 hdr->sh_type = SHT_PROGBITS;
2448
2449 return TRUE;
2450 }
2451
2452 /* Return the base VMA address which should be subtracted from real addresses
2453 when resolving @dtpoff relocation.
2454 This is PT_TLS segment p_vaddr. */
2455
2456 static bfd_vma
2457 dtpoff_base (struct bfd_link_info *info)
2458 {
2459 /* If tls_sec is NULL, we should have signalled an error already. */
2460 if (elf_hash_table (info)->tls_sec == NULL)
2461 return 0;
2462 return elf_hash_table (info)->tls_sec->vma;
2463 }
2464
2465 /* Return the relocation value for @tpoff relocation
2466 if STT_TLS virtual address is ADDRESS. */
2467
2468 static bfd_vma
2469 tpoff (struct bfd_link_info *info, bfd_vma address)
2470 {
2471 struct elf_link_hash_table *htab = elf_hash_table (info);
2472
2473 /* If tls_sec is NULL, we should have signalled an error already. */
2474 if (htab->tls_sec == NULL)
2475 return 0;
2476 return htab->tls_size + htab->tls_sec->vma - address;
2477 }
2478
2479 /* Relocate an i386 ELF section. */
2480
2481 static bfd_boolean
2482 elf_i386_relocate_section (bfd *output_bfd,
2483 struct bfd_link_info *info,
2484 bfd *input_bfd,
2485 asection *input_section,
2486 bfd_byte *contents,
2487 Elf_Internal_Rela *relocs,
2488 Elf_Internal_Sym *local_syms,
2489 asection **local_sections)
2490 {
2491 struct elf_i386_link_hash_table *htab;
2492 Elf_Internal_Shdr *symtab_hdr;
2493 struct elf_link_hash_entry **sym_hashes;
2494 bfd_vma *local_got_offsets;
2495 bfd_vma *local_tlsdesc_gotents;
2496 Elf_Internal_Rela *rel;
2497 Elf_Internal_Rela *relend;
2498
2499 htab = elf_i386_hash_table (info);
2500 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2501 sym_hashes = elf_sym_hashes (input_bfd);
2502 local_got_offsets = elf_local_got_offsets (input_bfd);
2503 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2504
2505 rel = relocs;
2506 relend = relocs + input_section->reloc_count;
2507 for (; rel < relend; rel++)
2508 {
2509 unsigned int r_type;
2510 reloc_howto_type *howto;
2511 unsigned long r_symndx;
2512 struct elf_link_hash_entry *h;
2513 Elf_Internal_Sym *sym;
2514 asection *sec;
2515 bfd_vma off, offplt;
2516 bfd_vma relocation;
2517 bfd_boolean unresolved_reloc;
2518 bfd_reloc_status_type r;
2519 unsigned int indx;
2520 int tls_type;
2521
2522 r_type = ELF32_R_TYPE (rel->r_info);
2523 if (r_type == R_386_GNU_VTINHERIT
2524 || r_type == R_386_GNU_VTENTRY)
2525 continue;
2526
2527 if ((indx = r_type) >= R_386_standard
2528 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2529 >= R_386_ext - R_386_standard)
2530 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2531 >= R_386_tls - R_386_ext))
2532 {
2533 (*_bfd_error_handler)
2534 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2535 input_bfd, input_section, r_type);
2536 bfd_set_error (bfd_error_bad_value);
2537 return FALSE;
2538 }
2539 howto = elf_howto_table + indx;
2540
2541 r_symndx = ELF32_R_SYM (rel->r_info);
2542 h = NULL;
2543 sym = NULL;
2544 sec = NULL;
2545 unresolved_reloc = FALSE;
2546 if (r_symndx < symtab_hdr->sh_info)
2547 {
2548 sym = local_syms + r_symndx;
2549 sec = local_sections[r_symndx];
2550 relocation = (sec->output_section->vma
2551 + sec->output_offset
2552 + sym->st_value);
2553
2554 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2555 && ((sec->flags & SEC_MERGE) != 0
2556 || (info->relocatable
2557 && sec->output_offset != 0)))
2558 {
2559 bfd_vma addend;
2560 bfd_byte *where = contents + rel->r_offset;
2561
2562 switch (howto->size)
2563 {
2564 case 0:
2565 addend = bfd_get_8 (input_bfd, where);
2566 if (howto->pc_relative)
2567 {
2568 addend = (addend ^ 0x80) - 0x80;
2569 addend += 1;
2570 }
2571 break;
2572 case 1:
2573 addend = bfd_get_16 (input_bfd, where);
2574 if (howto->pc_relative)
2575 {
2576 addend = (addend ^ 0x8000) - 0x8000;
2577 addend += 2;
2578 }
2579 break;
2580 case 2:
2581 addend = bfd_get_32 (input_bfd, where);
2582 if (howto->pc_relative)
2583 {
2584 addend = (addend ^ 0x80000000) - 0x80000000;
2585 addend += 4;
2586 }
2587 break;
2588 default:
2589 abort ();
2590 }
2591
2592 if (info->relocatable)
2593 addend += sec->output_offset;
2594 else
2595 {
2596 asection *msec = sec;
2597 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2598 addend);
2599 addend -= relocation;
2600 addend += msec->output_section->vma + msec->output_offset;
2601 }
2602
2603 switch (howto->size)
2604 {
2605 case 0:
2606 /* FIXME: overflow checks. */
2607 if (howto->pc_relative)
2608 addend -= 1;
2609 bfd_put_8 (input_bfd, addend, where);
2610 break;
2611 case 1:
2612 if (howto->pc_relative)
2613 addend -= 2;
2614 bfd_put_16 (input_bfd, addend, where);
2615 break;
2616 case 2:
2617 if (howto->pc_relative)
2618 addend -= 4;
2619 bfd_put_32 (input_bfd, addend, where);
2620 break;
2621 }
2622 }
2623 }
2624 else
2625 {
2626 bfd_boolean warned;
2627
2628 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2629 r_symndx, symtab_hdr, sym_hashes,
2630 h, sec, relocation,
2631 unresolved_reloc, warned);
2632 }
2633
2634 if (sec != NULL && elf_discarded_section (sec))
2635 {
2636 /* For relocs against symbols from removed linkonce sections,
2637 or sections discarded by a linker script, we just want the
2638 section contents zeroed. Avoid any special processing. */
2639 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2640 rel->r_info = 0;
2641 rel->r_addend = 0;
2642 continue;
2643 }
2644
2645 if (info->relocatable)
2646 continue;
2647
2648 switch (r_type)
2649 {
2650 case R_386_GOT32:
2651 /* Relocation is to the entry for this symbol in the global
2652 offset table. */
2653 if (htab->sgot == NULL)
2654 abort ();
2655
2656 if (h != NULL)
2657 {
2658 bfd_boolean dyn;
2659
2660 off = h->got.offset;
2661 dyn = htab->elf.dynamic_sections_created;
2662 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2663 || (info->shared
2664 && SYMBOL_REFERENCES_LOCAL (info, h))
2665 || (ELF_ST_VISIBILITY (h->other)
2666 && h->root.type == bfd_link_hash_undefweak))
2667 {
2668 /* This is actually a static link, or it is a
2669 -Bsymbolic link and the symbol is defined
2670 locally, or the symbol was forced to be local
2671 because of a version file. We must initialize
2672 this entry in the global offset table. Since the
2673 offset must always be a multiple of 4, we use the
2674 least significant bit to record whether we have
2675 initialized it already.
2676
2677 When doing a dynamic link, we create a .rel.got
2678 relocation entry to initialize the value. This
2679 is done in the finish_dynamic_symbol routine. */
2680 if ((off & 1) != 0)
2681 off &= ~1;
2682 else
2683 {
2684 bfd_put_32 (output_bfd, relocation,
2685 htab->sgot->contents + off);
2686 h->got.offset |= 1;
2687 }
2688 }
2689 else
2690 unresolved_reloc = FALSE;
2691 }
2692 else
2693 {
2694 if (local_got_offsets == NULL)
2695 abort ();
2696
2697 off = local_got_offsets[r_symndx];
2698
2699 /* The offset must always be a multiple of 4. We use
2700 the least significant bit to record whether we have
2701 already generated the necessary reloc. */
2702 if ((off & 1) != 0)
2703 off &= ~1;
2704 else
2705 {
2706 bfd_put_32 (output_bfd, relocation,
2707 htab->sgot->contents + off);
2708
2709 if (info->shared)
2710 {
2711 asection *s;
2712 Elf_Internal_Rela outrel;
2713 bfd_byte *loc;
2714
2715 s = htab->srelgot;
2716 if (s == NULL)
2717 abort ();
2718
2719 outrel.r_offset = (htab->sgot->output_section->vma
2720 + htab->sgot->output_offset
2721 + off);
2722 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2723 loc = s->contents;
2724 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2725 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2726 }
2727
2728 local_got_offsets[r_symndx] |= 1;
2729 }
2730 }
2731
2732 if (off >= (bfd_vma) -2)
2733 abort ();
2734
2735 relocation = htab->sgot->output_section->vma
2736 + htab->sgot->output_offset + off
2737 - htab->sgotplt->output_section->vma
2738 - htab->sgotplt->output_offset;
2739 break;
2740
2741 case R_386_GOTOFF:
2742 /* Relocation is relative to the start of the global offset
2743 table. */
2744
2745 /* Check to make sure it isn't a protected function symbol
2746 for shared library since it may not be local when used
2747 as function address. */
2748 if (info->shared
2749 && !info->executable
2750 && h
2751 && h->def_regular
2752 && h->type == STT_FUNC
2753 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2754 {
2755 (*_bfd_error_handler)
2756 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2757 input_bfd, h->root.root.string);
2758 bfd_set_error (bfd_error_bad_value);
2759 return FALSE;
2760 }
2761
2762 /* Note that sgot is not involved in this
2763 calculation. We always want the start of .got.plt. If we
2764 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2765 permitted by the ABI, we might have to change this
2766 calculation. */
2767 relocation -= htab->sgotplt->output_section->vma
2768 + htab->sgotplt->output_offset;
2769 break;
2770
2771 case R_386_GOTPC:
2772 /* Use global offset table as symbol value. */
2773 relocation = htab->sgotplt->output_section->vma
2774 + htab->sgotplt->output_offset;
2775 unresolved_reloc = FALSE;
2776 break;
2777
2778 case R_386_PLT32:
2779 /* Relocation is to the entry for this symbol in the
2780 procedure linkage table. */
2781
2782 /* Resolve a PLT32 reloc against a local symbol directly,
2783 without using the procedure linkage table. */
2784 if (h == NULL)
2785 break;
2786
2787 if (h->plt.offset == (bfd_vma) -1
2788 || htab->splt == NULL)
2789 {
2790 /* We didn't make a PLT entry for this symbol. This
2791 happens when statically linking PIC code, or when
2792 using -Bsymbolic. */
2793 break;
2794 }
2795
2796 relocation = (htab->splt->output_section->vma
2797 + htab->splt->output_offset
2798 + h->plt.offset);
2799 unresolved_reloc = FALSE;
2800 break;
2801
2802 case R_386_32:
2803 case R_386_PC32:
2804 if ((input_section->flags & SEC_ALLOC) == 0)
2805 break;
2806
2807 if ((info->shared
2808 && (h == NULL
2809 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2810 || h->root.type != bfd_link_hash_undefweak)
2811 && (r_type != R_386_PC32
2812 || !SYMBOL_CALLS_LOCAL (info, h)))
2813 || (ELIMINATE_COPY_RELOCS
2814 && !info->shared
2815 && h != NULL
2816 && h->dynindx != -1
2817 && !h->non_got_ref
2818 && ((h->def_dynamic
2819 && !h->def_regular)
2820 || h->root.type == bfd_link_hash_undefweak
2821 || h->root.type == bfd_link_hash_undefined)))
2822 {
2823 Elf_Internal_Rela outrel;
2824 bfd_byte *loc;
2825 bfd_boolean skip, relocate;
2826 asection *sreloc;
2827
2828 /* When generating a shared object, these relocations
2829 are copied into the output file to be resolved at run
2830 time. */
2831
2832 skip = FALSE;
2833 relocate = FALSE;
2834
2835 outrel.r_offset =
2836 _bfd_elf_section_offset (output_bfd, info, input_section,
2837 rel->r_offset);
2838 if (outrel.r_offset == (bfd_vma) -1)
2839 skip = TRUE;
2840 else if (outrel.r_offset == (bfd_vma) -2)
2841 skip = TRUE, relocate = TRUE;
2842 outrel.r_offset += (input_section->output_section->vma
2843 + input_section->output_offset);
2844
2845 if (skip)
2846 memset (&outrel, 0, sizeof outrel);
2847 else if (h != NULL
2848 && h->dynindx != -1
2849 && (r_type == R_386_PC32
2850 || !info->shared
2851 || !SYMBOLIC_BIND (info, h)
2852 || !h->def_regular))
2853 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2854 else
2855 {
2856 /* This symbol is local, or marked to become local. */
2857 relocate = TRUE;
2858 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2859 }
2860
2861 sreloc = elf_section_data (input_section)->sreloc;
2862 if (sreloc == NULL)
2863 abort ();
2864
2865 loc = sreloc->contents;
2866 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2867 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2868
2869 /* If this reloc is against an external symbol, we do
2870 not want to fiddle with the addend. Otherwise, we
2871 need to include the symbol value so that it becomes
2872 an addend for the dynamic reloc. */
2873 if (! relocate)
2874 continue;
2875 }
2876 break;
2877
2878 case R_386_TLS_IE:
2879 if (info->shared)
2880 {
2881 Elf_Internal_Rela outrel;
2882 bfd_byte *loc;
2883 asection *sreloc;
2884
2885 outrel.r_offset = rel->r_offset
2886 + input_section->output_section->vma
2887 + input_section->output_offset;
2888 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2889 sreloc = elf_section_data (input_section)->sreloc;
2890 if (sreloc == NULL)
2891 abort ();
2892 loc = sreloc->contents;
2893 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2894 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2895 }
2896 /* Fall through */
2897
2898 case R_386_TLS_GD:
2899 case R_386_TLS_GOTDESC:
2900 case R_386_TLS_DESC_CALL:
2901 case R_386_TLS_IE_32:
2902 case R_386_TLS_GOTIE:
2903 tls_type = GOT_UNKNOWN;
2904 if (h == NULL && local_got_offsets)
2905 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2906 else if (h != NULL)
2907 tls_type = elf_i386_hash_entry(h)->tls_type;
2908 if (tls_type == GOT_TLS_IE)
2909 tls_type = GOT_TLS_IE_NEG;
2910
2911 if (! elf_i386_tls_transition (info, input_bfd,
2912 input_section, contents,
2913 symtab_hdr, sym_hashes,
2914 &r_type, tls_type, rel,
2915 relend, h))
2916 return FALSE;
2917
2918 if (r_type == R_386_TLS_LE_32)
2919 {
2920 BFD_ASSERT (! unresolved_reloc);
2921 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2922 {
2923 unsigned int type;
2924 bfd_vma roff;
2925
2926 /* GD->LE transition. */
2927 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2928 if (type == 0x04)
2929 {
2930 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2931 Change it into:
2932 movl %gs:0, %eax; subl $foo@tpoff, %eax
2933 (6 byte form of subl). */
2934 memcpy (contents + rel->r_offset - 3,
2935 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2936 roff = rel->r_offset + 5;
2937 }
2938 else
2939 {
2940 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2941 Change it into:
2942 movl %gs:0, %eax; subl $foo@tpoff, %eax
2943 (6 byte form of subl). */
2944 memcpy (contents + rel->r_offset - 2,
2945 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2946 roff = rel->r_offset + 6;
2947 }
2948 bfd_put_32 (output_bfd, tpoff (info, relocation),
2949 contents + roff);
2950 /* Skip R_386_PC32/R_386_PLT32. */
2951 rel++;
2952 continue;
2953 }
2954 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
2955 {
2956 /* GDesc -> LE transition.
2957 It's originally something like:
2958 leal x@tlsdesc(%ebx), %eax
2959
2960 leal x@ntpoff, %eax
2961
2962 Registers other than %eax may be set up here. */
2963
2964 unsigned int val;
2965 bfd_vma roff;
2966
2967 roff = rel->r_offset;
2968 val = bfd_get_8 (input_bfd, contents + roff - 1);
2969
2970 /* Now modify the instruction as appropriate. */
2971 /* aoliva FIXME: remove the above and xor the byte
2972 below with 0x86. */
2973 bfd_put_8 (output_bfd, val ^ 0x86,
2974 contents + roff - 1);
2975 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2976 contents + roff);
2977 continue;
2978 }
2979 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
2980 {
2981 /* GDesc -> LE transition.
2982 It's originally:
2983 call *(%eax)
2984 Turn it into:
2985 xchg %ax,%ax */
2986
2987 bfd_vma roff;
2988
2989 roff = rel->r_offset;
2990 bfd_put_8 (output_bfd, 0x66, contents + roff);
2991 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2992 continue;
2993 }
2994 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2995 {
2996 unsigned int val;
2997
2998 /* IE->LE transition:
2999 Originally it can be one of:
3000 movl foo, %eax
3001 movl foo, %reg
3002 addl foo, %reg
3003 We change it into:
3004 movl $foo, %eax
3005 movl $foo, %reg
3006 addl $foo, %reg. */
3007 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3008 if (val == 0xa1)
3009 {
3010 /* movl foo, %eax. */
3011 bfd_put_8 (output_bfd, 0xb8,
3012 contents + rel->r_offset - 1);
3013 }
3014 else
3015 {
3016 unsigned int type;
3017
3018 type = bfd_get_8 (input_bfd,
3019 contents + rel->r_offset - 2);
3020 switch (type)
3021 {
3022 case 0x8b:
3023 /* movl */
3024 bfd_put_8 (output_bfd, 0xc7,
3025 contents + rel->r_offset - 2);
3026 bfd_put_8 (output_bfd,
3027 0xc0 | ((val >> 3) & 7),
3028 contents + rel->r_offset - 1);
3029 break;
3030 case 0x03:
3031 /* addl */
3032 bfd_put_8 (output_bfd, 0x81,
3033 contents + rel->r_offset - 2);
3034 bfd_put_8 (output_bfd,
3035 0xc0 | ((val >> 3) & 7),
3036 contents + rel->r_offset - 1);
3037 break;
3038 default:
3039 BFD_FAIL ();
3040 break;
3041 }
3042 }
3043 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3044 contents + rel->r_offset);
3045 continue;
3046 }
3047 else
3048 {
3049 unsigned int val, type;
3050
3051 /* {IE_32,GOTIE}->LE transition:
3052 Originally it can be one of:
3053 subl foo(%reg1), %reg2
3054 movl foo(%reg1), %reg2
3055 addl foo(%reg1), %reg2
3056 We change it into:
3057 subl $foo, %reg2
3058 movl $foo, %reg2 (6 byte form)
3059 addl $foo, %reg2. */
3060 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3061 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3062 if (type == 0x8b)
3063 {
3064 /* movl */
3065 bfd_put_8 (output_bfd, 0xc7,
3066 contents + rel->r_offset - 2);
3067 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3068 contents + rel->r_offset - 1);
3069 }
3070 else if (type == 0x2b)
3071 {
3072 /* subl */
3073 bfd_put_8 (output_bfd, 0x81,
3074 contents + rel->r_offset - 2);
3075 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3076 contents + rel->r_offset - 1);
3077 }
3078 else if (type == 0x03)
3079 {
3080 /* addl */
3081 bfd_put_8 (output_bfd, 0x81,
3082 contents + rel->r_offset - 2);
3083 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3084 contents + rel->r_offset - 1);
3085 }
3086 else
3087 BFD_FAIL ();
3088 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3089 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3090 contents + rel->r_offset);
3091 else
3092 bfd_put_32 (output_bfd, tpoff (info, relocation),
3093 contents + rel->r_offset);
3094 continue;
3095 }
3096 }
3097
3098 if (htab->sgot == NULL)
3099 abort ();
3100
3101 if (h != NULL)
3102 {
3103 off = h->got.offset;
3104 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3105 }
3106 else
3107 {
3108 if (local_got_offsets == NULL)
3109 abort ();
3110
3111 off = local_got_offsets[r_symndx];
3112 offplt = local_tlsdesc_gotents[r_symndx];
3113 }
3114
3115 if ((off & 1) != 0)
3116 off &= ~1;
3117 else
3118 {
3119 Elf_Internal_Rela outrel;
3120 bfd_byte *loc;
3121 int dr_type, indx;
3122 asection *sreloc;
3123
3124 if (htab->srelgot == NULL)
3125 abort ();
3126
3127 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3128
3129 if (GOT_TLS_GDESC_P (tls_type))
3130 {
3131 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3132 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3133 <= htab->sgotplt->size);
3134 outrel.r_offset = (htab->sgotplt->output_section->vma
3135 + htab->sgotplt->output_offset
3136 + offplt
3137 + htab->sgotplt_jump_table_size);
3138 sreloc = htab->srelplt;
3139 loc = sreloc->contents;
3140 loc += (htab->next_tls_desc_index++
3141 * sizeof (Elf32_External_Rel));
3142 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3143 <= sreloc->contents + sreloc->size);
3144 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3145 if (indx == 0)
3146 {
3147 BFD_ASSERT (! unresolved_reloc);
3148 bfd_put_32 (output_bfd,
3149 relocation - dtpoff_base (info),
3150 htab->sgotplt->contents + offplt
3151 + htab->sgotplt_jump_table_size + 4);
3152 }
3153 else
3154 {
3155 bfd_put_32 (output_bfd, 0,
3156 htab->sgotplt->contents + offplt
3157 + htab->sgotplt_jump_table_size + 4);
3158 }
3159 }
3160
3161 sreloc = htab->srelgot;
3162
3163 outrel.r_offset = (htab->sgot->output_section->vma
3164 + htab->sgot->output_offset + off);
3165
3166 if (GOT_TLS_GD_P (tls_type))
3167 dr_type = R_386_TLS_DTPMOD32;
3168 else if (GOT_TLS_GDESC_P (tls_type))
3169 goto dr_done;
3170 else if (tls_type == GOT_TLS_IE_POS)
3171 dr_type = R_386_TLS_TPOFF;
3172 else
3173 dr_type = R_386_TLS_TPOFF32;
3174
3175 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3176 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
3177 htab->sgot->contents + off);
3178 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3179 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
3180 htab->sgot->contents + off);
3181 else if (dr_type != R_386_TLS_DESC)
3182 bfd_put_32 (output_bfd, 0,
3183 htab->sgot->contents + off);
3184 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3185
3186 loc = sreloc->contents;
3187 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3188 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3189 <= sreloc->contents + sreloc->size);
3190 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3191
3192 if (GOT_TLS_GD_P (tls_type))
3193 {
3194 if (indx == 0)
3195 {
3196 BFD_ASSERT (! unresolved_reloc);
3197 bfd_put_32 (output_bfd,
3198 relocation - dtpoff_base (info),
3199 htab->sgot->contents + off + 4);
3200 }
3201 else
3202 {
3203 bfd_put_32 (output_bfd, 0,
3204 htab->sgot->contents + off + 4);
3205 outrel.r_info = ELF32_R_INFO (indx,
3206 R_386_TLS_DTPOFF32);
3207 outrel.r_offset += 4;
3208 sreloc->reloc_count++;
3209 loc += sizeof (Elf32_External_Rel);
3210 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3211 <= sreloc->contents + sreloc->size);
3212 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3213 }
3214 }
3215 else if (tls_type == GOT_TLS_IE_BOTH)
3216 {
3217 bfd_put_32 (output_bfd,
3218 indx == 0 ? relocation - dtpoff_base (info) : 0,
3219 htab->sgot->contents + off + 4);
3220 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3221 outrel.r_offset += 4;
3222 sreloc->reloc_count++;
3223 loc += sizeof (Elf32_External_Rel);
3224 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3225 }
3226
3227 dr_done:
3228 if (h != NULL)
3229 h->got.offset |= 1;
3230 else
3231 local_got_offsets[r_symndx] |= 1;
3232 }
3233
3234 if (off >= (bfd_vma) -2
3235 && ! GOT_TLS_GDESC_P (tls_type))
3236 abort ();
3237 if (r_type == R_386_TLS_GOTDESC
3238 || r_type == R_386_TLS_DESC_CALL)
3239 {
3240 relocation = htab->sgotplt_jump_table_size + offplt;
3241 unresolved_reloc = FALSE;
3242 }
3243 else if (r_type == ELF32_R_TYPE (rel->r_info))
3244 {
3245 bfd_vma g_o_t = htab->sgotplt->output_section->vma
3246 + htab->sgotplt->output_offset;
3247 relocation = htab->sgot->output_section->vma
3248 + htab->sgot->output_offset + off - g_o_t;
3249 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3250 && tls_type == GOT_TLS_IE_BOTH)
3251 relocation += 4;
3252 if (r_type == R_386_TLS_IE)
3253 relocation += g_o_t;
3254 unresolved_reloc = FALSE;
3255 }
3256 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3257 {
3258 unsigned int val, type;
3259 bfd_vma roff;
3260
3261 /* GD->IE transition. */
3262 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3263 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3264 if (type == 0x04)
3265 {
3266 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3267 Change it into:
3268 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3269 val >>= 3;
3270 roff = rel->r_offset - 3;
3271 }
3272 else
3273 {
3274 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3275 Change it into:
3276 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3277 roff = rel->r_offset - 2;
3278 }
3279 memcpy (contents + roff,
3280 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3281 contents[roff + 7] = 0x80 | (val & 7);
3282 /* If foo is used only with foo@gotntpoff(%reg) and
3283 foo@indntpoff, but not with foo@gottpoff(%reg), change
3284 subl $foo@gottpoff(%reg), %eax
3285 into:
3286 addl $foo@gotntpoff(%reg), %eax. */
3287 if (tls_type == GOT_TLS_IE_POS)
3288 contents[roff + 6] = 0x03;
3289 bfd_put_32 (output_bfd,
3290 htab->sgot->output_section->vma
3291 + htab->sgot->output_offset + off
3292 - htab->sgotplt->output_section->vma
3293 - htab->sgotplt->output_offset,
3294 contents + roff + 8);
3295 /* Skip R_386_PLT32. */
3296 rel++;
3297 continue;
3298 }
3299 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3300 {
3301 /* GDesc -> IE transition.
3302 It's originally something like:
3303 leal x@tlsdesc(%ebx), %eax
3304
3305 Change it to:
3306 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3307 or:
3308 movl x@gottpoff(%ebx), %eax # before negl %eax
3309
3310 Registers other than %eax may be set up here. */
3311
3312 bfd_vma roff;
3313
3314 /* First, make sure it's a leal adding ebx to a 32-bit
3315 offset into any register, although it's probably
3316 almost always going to be eax. */
3317 roff = rel->r_offset;
3318
3319 /* Now modify the instruction as appropriate. */
3320 /* To turn a leal into a movl in the form we use it, it
3321 suffices to change the first byte from 0x8d to 0x8b.
3322 aoliva FIXME: should we decide to keep the leal, all
3323 we have to do is remove the statement below, and
3324 adjust the relaxation of R_386_TLS_DESC_CALL. */
3325 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3326
3327 if (tls_type == GOT_TLS_IE_BOTH)
3328 off += 4;
3329
3330 bfd_put_32 (output_bfd,
3331 htab->sgot->output_section->vma
3332 + htab->sgot->output_offset + off
3333 - htab->sgotplt->output_section->vma
3334 - htab->sgotplt->output_offset,
3335 contents + roff);
3336 continue;
3337 }
3338 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3339 {
3340 /* GDesc -> IE transition.
3341 It's originally:
3342 call *(%eax)
3343
3344 Change it to:
3345 xchg %ax,%ax
3346 or
3347 negl %eax
3348 depending on how we transformed the TLS_GOTDESC above.
3349 */
3350
3351 bfd_vma roff;
3352
3353 roff = rel->r_offset;
3354
3355 /* Now modify the instruction as appropriate. */
3356 if (tls_type != GOT_TLS_IE_NEG)
3357 {
3358 /* xchg %ax,%ax */
3359 bfd_put_8 (output_bfd, 0x66, contents + roff);
3360 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3361 }
3362 else
3363 {
3364 /* negl %eax */
3365 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3366 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3367 }
3368
3369 continue;
3370 }
3371 else
3372 BFD_ASSERT (FALSE);
3373 break;
3374
3375 case R_386_TLS_LDM:
3376 if (! elf_i386_tls_transition (info, input_bfd,
3377 input_section, contents,
3378 symtab_hdr, sym_hashes,
3379 &r_type, GOT_UNKNOWN, rel,
3380 relend, h))
3381 return FALSE;
3382
3383 if (r_type != R_386_TLS_LDM)
3384 {
3385 /* LD->LE transition:
3386 leal foo(%reg), %eax; call ___tls_get_addr.
3387 We change it into:
3388 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3389 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3390 memcpy (contents + rel->r_offset - 2,
3391 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3392 /* Skip R_386_PC32/R_386_PLT32. */
3393 rel++;
3394 continue;
3395 }
3396
3397 if (htab->sgot == NULL)
3398 abort ();
3399
3400 off = htab->tls_ldm_got.offset;
3401 if (off & 1)
3402 off &= ~1;
3403 else
3404 {
3405 Elf_Internal_Rela outrel;
3406 bfd_byte *loc;
3407
3408 if (htab->srelgot == NULL)
3409 abort ();
3410
3411 outrel.r_offset = (htab->sgot->output_section->vma
3412 + htab->sgot->output_offset + off);
3413
3414 bfd_put_32 (output_bfd, 0,
3415 htab->sgot->contents + off);
3416 bfd_put_32 (output_bfd, 0,
3417 htab->sgot->contents + off + 4);
3418 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3419 loc = htab->srelgot->contents;
3420 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3421 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3422 htab->tls_ldm_got.offset |= 1;
3423 }
3424 relocation = htab->sgot->output_section->vma
3425 + htab->sgot->output_offset + off
3426 - htab->sgotplt->output_section->vma
3427 - htab->sgotplt->output_offset;
3428 unresolved_reloc = FALSE;
3429 break;
3430
3431 case R_386_TLS_LDO_32:
3432 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3433 relocation -= dtpoff_base (info);
3434 else
3435 /* When converting LDO to LE, we must negate. */
3436 relocation = -tpoff (info, relocation);
3437 break;
3438
3439 case R_386_TLS_LE_32:
3440 case R_386_TLS_LE:
3441 if (info->shared)
3442 {
3443 Elf_Internal_Rela outrel;
3444 asection *sreloc;
3445 bfd_byte *loc;
3446 int indx;
3447
3448 outrel.r_offset = rel->r_offset
3449 + input_section->output_section->vma
3450 + input_section->output_offset;
3451 if (h != NULL && h->dynindx != -1)
3452 indx = h->dynindx;
3453 else
3454 indx = 0;
3455 if (r_type == R_386_TLS_LE_32)
3456 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3457 else
3458 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3459 sreloc = elf_section_data (input_section)->sreloc;
3460 if (sreloc == NULL)
3461 abort ();
3462 loc = sreloc->contents;
3463 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3464 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3465 if (indx)
3466 continue;
3467 else if (r_type == R_386_TLS_LE_32)
3468 relocation = dtpoff_base (info) - relocation;
3469 else
3470 relocation -= dtpoff_base (info);
3471 }
3472 else if (r_type == R_386_TLS_LE_32)
3473 relocation = tpoff (info, relocation);
3474 else
3475 relocation = -tpoff (info, relocation);
3476 break;
3477
3478 default:
3479 break;
3480 }
3481
3482 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3483 because such sections are not SEC_ALLOC and thus ld.so will
3484 not process them. */
3485 if (unresolved_reloc
3486 && !((input_section->flags & SEC_DEBUGGING) != 0
3487 && h->def_dynamic))
3488 {
3489 (*_bfd_error_handler)
3490 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3491 input_bfd,
3492 input_section,
3493 (long) rel->r_offset,
3494 howto->name,
3495 h->root.root.string);
3496 return FALSE;
3497 }
3498
3499 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3500 contents, rel->r_offset,
3501 relocation, 0);
3502
3503 if (r != bfd_reloc_ok)
3504 {
3505 const char *name;
3506
3507 if (h != NULL)
3508 name = h->root.root.string;
3509 else
3510 {
3511 name = bfd_elf_string_from_elf_section (input_bfd,
3512 symtab_hdr->sh_link,
3513 sym->st_name);
3514 if (name == NULL)
3515 return FALSE;
3516 if (*name == '\0')
3517 name = bfd_section_name (input_bfd, sec);
3518 }
3519
3520 if (r == bfd_reloc_overflow)
3521 {
3522 if (! ((*info->callbacks->reloc_overflow)
3523 (info, (h ? &h->root : NULL), name, howto->name,
3524 (bfd_vma) 0, input_bfd, input_section,
3525 rel->r_offset)))
3526 return FALSE;
3527 }
3528 else
3529 {
3530 (*_bfd_error_handler)
3531 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3532 input_bfd, input_section,
3533 (long) rel->r_offset, name, (int) r);
3534 return FALSE;
3535 }
3536 }
3537 }
3538
3539 return TRUE;
3540 }
3541
3542 /* Finish up dynamic symbol handling. We set the contents of various
3543 dynamic sections here. */
3544
3545 static bfd_boolean
3546 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3547 struct bfd_link_info *info,
3548 struct elf_link_hash_entry *h,
3549 Elf_Internal_Sym *sym)
3550 {
3551 struct elf_i386_link_hash_table *htab;
3552
3553 htab = elf_i386_hash_table (info);
3554
3555 if (h->plt.offset != (bfd_vma) -1)
3556 {
3557 bfd_vma plt_index;
3558 bfd_vma got_offset;
3559 Elf_Internal_Rela rel;
3560 bfd_byte *loc;
3561
3562 /* This symbol has an entry in the procedure linkage table. Set
3563 it up. */
3564
3565 if (h->dynindx == -1
3566 || htab->splt == NULL
3567 || htab->sgotplt == NULL
3568 || htab->srelplt == NULL)
3569 abort ();
3570
3571 /* Get the index in the procedure linkage table which
3572 corresponds to this symbol. This is the index of this symbol
3573 in all the symbols for which we are making plt entries. The
3574 first entry in the procedure linkage table is reserved. */
3575 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3576
3577 /* Get the offset into the .got table of the entry that
3578 corresponds to this function. Each .got entry is 4 bytes.
3579 The first three are reserved. */
3580 got_offset = (plt_index + 3) * 4;
3581
3582 /* Fill in the entry in the procedure linkage table. */
3583 if (! info->shared)
3584 {
3585 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3586 PLT_ENTRY_SIZE);
3587 bfd_put_32 (output_bfd,
3588 (htab->sgotplt->output_section->vma
3589 + htab->sgotplt->output_offset
3590 + got_offset),
3591 htab->splt->contents + h->plt.offset + 2);
3592
3593 if (htab->is_vxworks)
3594 {
3595 int s, k, reloc_index;
3596
3597 /* Create the R_386_32 relocation referencing the GOT
3598 for this PLT entry. */
3599
3600 /* S: Current slot number (zero-based). */
3601 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3602 /* K: Number of relocations for PLTResolve. */
3603 if (info->shared)
3604 k = PLTRESOLVE_RELOCS_SHLIB;
3605 else
3606 k = PLTRESOLVE_RELOCS;
3607 /* Skip the PLTresolve relocations, and the relocations for
3608 the other PLT slots. */
3609 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3610 loc = (htab->srelplt2->contents + reloc_index
3611 * sizeof (Elf32_External_Rel));
3612
3613 rel.r_offset = (htab->splt->output_section->vma
3614 + htab->splt->output_offset
3615 + h->plt.offset + 2),
3616 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3617 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3618
3619 /* Create the R_386_32 relocation referencing the beginning of
3620 the PLT for this GOT entry. */
3621 rel.r_offset = (htab->sgotplt->output_section->vma
3622 + htab->sgotplt->output_offset
3623 + got_offset);
3624 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3625 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3626 loc + sizeof (Elf32_External_Rel));
3627 }
3628 }
3629 else
3630 {
3631 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3632 PLT_ENTRY_SIZE);
3633 bfd_put_32 (output_bfd, got_offset,
3634 htab->splt->contents + h->plt.offset + 2);
3635 }
3636
3637 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3638 htab->splt->contents + h->plt.offset + 7);
3639 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3640 htab->splt->contents + h->plt.offset + 12);
3641
3642 /* Fill in the entry in the global offset table. */
3643 bfd_put_32 (output_bfd,
3644 (htab->splt->output_section->vma
3645 + htab->splt->output_offset
3646 + h->plt.offset
3647 + 6),
3648 htab->sgotplt->contents + got_offset);
3649
3650 /* Fill in the entry in the .rel.plt section. */
3651 rel.r_offset = (htab->sgotplt->output_section->vma
3652 + htab->sgotplt->output_offset
3653 + got_offset);
3654 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3655 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3656 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3657
3658 if (!h->def_regular)
3659 {
3660 /* Mark the symbol as undefined, rather than as defined in
3661 the .plt section. Leave the value if there were any
3662 relocations where pointer equality matters (this is a clue
3663 for the dynamic linker, to make function pointer
3664 comparisons work between an application and shared
3665 library), otherwise set it to zero. If a function is only
3666 called from a binary, there is no need to slow down
3667 shared libraries because of that. */
3668 sym->st_shndx = SHN_UNDEF;
3669 if (!h->pointer_equality_needed)
3670 sym->st_value = 0;
3671 }
3672 }
3673
3674 if (h->got.offset != (bfd_vma) -1
3675 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
3676 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3677 {
3678 Elf_Internal_Rela rel;
3679 bfd_byte *loc;
3680
3681 /* This symbol has an entry in the global offset table. Set it
3682 up. */
3683
3684 if (htab->sgot == NULL || htab->srelgot == NULL)
3685 abort ();
3686
3687 rel.r_offset = (htab->sgot->output_section->vma
3688 + htab->sgot->output_offset
3689 + (h->got.offset & ~(bfd_vma) 1));
3690
3691 /* If this is a static link, or it is a -Bsymbolic link and the
3692 symbol is defined locally or was forced to be local because
3693 of a version file, we just want to emit a RELATIVE reloc.
3694 The entry in the global offset table will already have been
3695 initialized in the relocate_section function. */
3696 if (info->shared
3697 && SYMBOL_REFERENCES_LOCAL (info, h))
3698 {
3699 BFD_ASSERT((h->got.offset & 1) != 0);
3700 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3701 }
3702 else
3703 {
3704 BFD_ASSERT((h->got.offset & 1) == 0);
3705 bfd_put_32 (output_bfd, (bfd_vma) 0,
3706 htab->sgot->contents + h->got.offset);
3707 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3708 }
3709
3710 loc = htab->srelgot->contents;
3711 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3712 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3713 }
3714
3715 if (h->needs_copy)
3716 {
3717 Elf_Internal_Rela rel;
3718 bfd_byte *loc;
3719
3720 /* This symbol needs a copy reloc. Set it up. */
3721
3722 if (h->dynindx == -1
3723 || (h->root.type != bfd_link_hash_defined
3724 && h->root.type != bfd_link_hash_defweak)
3725 || htab->srelbss == NULL)
3726 abort ();
3727
3728 rel.r_offset = (h->root.u.def.value
3729 + h->root.u.def.section->output_section->vma
3730 + h->root.u.def.section->output_offset);
3731 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3732 loc = htab->srelbss->contents;
3733 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3734 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3735 }
3736
3737 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3738 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3739 is relative to the ".got" section. */
3740 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3741 || (!htab->is_vxworks && h == htab->elf.hgot))
3742 sym->st_shndx = SHN_ABS;
3743
3744 return TRUE;
3745 }
3746
3747 /* Used to decide how to sort relocs in an optimal manner for the
3748 dynamic linker, before writing them out. */
3749
3750 static enum elf_reloc_type_class
3751 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3752 {
3753 switch (ELF32_R_TYPE (rela->r_info))
3754 {
3755 case R_386_RELATIVE:
3756 return reloc_class_relative;
3757 case R_386_JUMP_SLOT:
3758 return reloc_class_plt;
3759 case R_386_COPY:
3760 return reloc_class_copy;
3761 default:
3762 return reloc_class_normal;
3763 }
3764 }
3765
3766 /* Finish up the dynamic sections. */
3767
3768 static bfd_boolean
3769 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3770 struct bfd_link_info *info)
3771 {
3772 struct elf_i386_link_hash_table *htab;
3773 bfd *dynobj;
3774 asection *sdyn;
3775
3776 htab = elf_i386_hash_table (info);
3777 dynobj = htab->elf.dynobj;
3778 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3779
3780 if (htab->elf.dynamic_sections_created)
3781 {
3782 Elf32_External_Dyn *dyncon, *dynconend;
3783
3784 if (sdyn == NULL || htab->sgot == NULL)
3785 abort ();
3786
3787 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3788 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3789 for (; dyncon < dynconend; dyncon++)
3790 {
3791 Elf_Internal_Dyn dyn;
3792 asection *s;
3793
3794 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3795
3796 switch (dyn.d_tag)
3797 {
3798 default:
3799 continue;
3800
3801 case DT_PLTGOT:
3802 s = htab->sgotplt;
3803 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3804 break;
3805
3806 case DT_JMPREL:
3807 s = htab->srelplt;
3808 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3809 break;
3810
3811 case DT_PLTRELSZ:
3812 s = htab->srelplt;
3813 dyn.d_un.d_val = s->size;
3814 break;
3815
3816 case DT_RELSZ:
3817 /* My reading of the SVR4 ABI indicates that the
3818 procedure linkage table relocs (DT_JMPREL) should be
3819 included in the overall relocs (DT_REL). This is
3820 what Solaris does. However, UnixWare can not handle
3821 that case. Therefore, we override the DT_RELSZ entry
3822 here to make it not include the JMPREL relocs. */
3823 s = htab->srelplt;
3824 if (s == NULL)
3825 continue;
3826 dyn.d_un.d_val -= s->size;
3827 break;
3828
3829 case DT_REL:
3830 /* We may not be using the standard ELF linker script.
3831 If .rel.plt is the first .rel section, we adjust
3832 DT_REL to not include it. */
3833 s = htab->srelplt;
3834 if (s == NULL)
3835 continue;
3836 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3837 continue;
3838 dyn.d_un.d_ptr += s->size;
3839 break;
3840 }
3841
3842 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3843 }
3844
3845 /* Fill in the first entry in the procedure linkage table. */
3846 if (htab->splt && htab->splt->size > 0)
3847 {
3848 if (info->shared)
3849 {
3850 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3851 sizeof (elf_i386_pic_plt0_entry));
3852 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3853 htab->plt0_pad_byte,
3854 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3855 }
3856 else
3857 {
3858 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3859 sizeof(elf_i386_plt0_entry));
3860 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3861 htab->plt0_pad_byte,
3862 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3863 bfd_put_32 (output_bfd,
3864 (htab->sgotplt->output_section->vma
3865 + htab->sgotplt->output_offset
3866 + 4),
3867 htab->splt->contents + 2);
3868 bfd_put_32 (output_bfd,
3869 (htab->sgotplt->output_section->vma
3870 + htab->sgotplt->output_offset
3871 + 8),
3872 htab->splt->contents + 8);
3873
3874 if (htab->is_vxworks)
3875 {
3876 Elf_Internal_Rela rel;
3877
3878 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3879 On IA32 we use REL relocations so the addend goes in
3880 the PLT directly. */
3881 rel.r_offset = (htab->splt->output_section->vma
3882 + htab->splt->output_offset
3883 + 2);
3884 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3885 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3886 htab->srelplt2->contents);
3887 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3888 rel.r_offset = (htab->splt->output_section->vma
3889 + htab->splt->output_offset
3890 + 8);
3891 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3892 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3893 htab->srelplt2->contents +
3894 sizeof (Elf32_External_Rel));
3895 }
3896 }
3897
3898 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3899 really seem like the right value. */
3900 elf_section_data (htab->splt->output_section)
3901 ->this_hdr.sh_entsize = 4;
3902
3903 /* Correct the .rel.plt.unloaded relocations. */
3904 if (htab->is_vxworks && !info->shared)
3905 {
3906 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3907 unsigned char *p;
3908
3909 p = htab->srelplt2->contents;
3910 if (info->shared)
3911 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3912 else
3913 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3914
3915 for (; num_plts; num_plts--)
3916 {
3917 Elf_Internal_Rela rel;
3918 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3919 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3920 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3921 p += sizeof (Elf32_External_Rel);
3922
3923 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3924 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3925 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3926 p += sizeof (Elf32_External_Rel);
3927 }
3928 }
3929 }
3930 }
3931
3932 if (htab->sgotplt)
3933 {
3934 /* Fill in the first three entries in the global offset table. */
3935 if (htab->sgotplt->size > 0)
3936 {
3937 bfd_put_32 (output_bfd,
3938 (sdyn == NULL ? 0
3939 : sdyn->output_section->vma + sdyn->output_offset),
3940 htab->sgotplt->contents);
3941 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3942 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3943 }
3944
3945 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3946 }
3947
3948 if (htab->sgot && htab->sgot->size > 0)
3949 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3950
3951 return TRUE;
3952 }
3953
3954 /* Return address for Ith PLT stub in section PLT, for relocation REL
3955 or (bfd_vma) -1 if it should not be included. */
3956
3957 static bfd_vma
3958 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3959 const arelent *rel ATTRIBUTE_UNUSED)
3960 {
3961 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3962 }
3963
3964 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
3965
3966 static bfd_boolean
3967 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
3968 {
3969 if (h->plt.offset != (bfd_vma) -1
3970 && !h->def_regular
3971 && !h->pointer_equality_needed)
3972 return FALSE;
3973
3974 return _bfd_elf_hash_symbol (h);
3975 }
3976
3977 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3978 #define TARGET_LITTLE_NAME "elf32-i386"
3979 #define ELF_ARCH bfd_arch_i386
3980 #define ELF_MACHINE_CODE EM_386
3981 #define ELF_MAXPAGESIZE 0x1000
3982
3983 #define elf_backend_can_gc_sections 1
3984 #define elf_backend_can_refcount 1
3985 #define elf_backend_want_got_plt 1
3986 #define elf_backend_plt_readonly 1
3987 #define elf_backend_want_plt_sym 0
3988 #define elf_backend_got_header_size 12
3989
3990 /* Support RELA for objdump of prelink objects. */
3991 #define elf_info_to_howto elf_i386_info_to_howto_rel
3992 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3993
3994 #define bfd_elf32_mkobject elf_i386_mkobject
3995
3996 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3997 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3998 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3999 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4000
4001 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4002 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4003 #define elf_backend_check_relocs elf_i386_check_relocs
4004 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4005 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4006 #define elf_backend_fake_sections elf_i386_fake_sections
4007 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4008 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4009 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4010 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4011 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4012 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4013 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4014 #define elf_backend_relocate_section elf_i386_relocate_section
4015 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4016 #define elf_backend_always_size_sections elf_i386_always_size_sections
4017 #define elf_backend_omit_section_dynsym \
4018 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4019 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4020 #define elf_backend_hash_symbol elf_i386_hash_symbol
4021
4022 #include "elf32-target.h"
4023
4024 /* FreeBSD support. */
4025
4026 #undef TARGET_LITTLE_SYM
4027 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4028 #undef TARGET_LITTLE_NAME
4029 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4030 #undef ELF_OSABI
4031 #define ELF_OSABI ELFOSABI_FREEBSD
4032
4033 /* The kernel recognizes executables as valid only if they carry a
4034 "FreeBSD" label in the ELF header. So we put this label on all
4035 executables and (for simplicity) also all other object files. */
4036
4037 static void
4038 elf_i386_post_process_headers (bfd *abfd,
4039 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4040 {
4041 Elf_Internal_Ehdr *i_ehdrp;
4042
4043 i_ehdrp = elf_elfheader (abfd);
4044
4045 /* Put an ABI label supported by FreeBSD >= 4.1. */
4046 i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi;
4047 #ifdef OLD_FREEBSD_ABI_LABEL
4048 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4049 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4050 #endif
4051 }
4052
4053 #undef elf_backend_post_process_headers
4054 #define elf_backend_post_process_headers elf_i386_post_process_headers
4055 #undef elf32_bed
4056 #define elf32_bed elf32_i386_fbsd_bed
4057
4058 #include "elf32-target.h"
4059
4060 /* VxWorks support. */
4061
4062 #undef TARGET_LITTLE_SYM
4063 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4064 #undef TARGET_LITTLE_NAME
4065 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4066 #undef ELF_OSABI
4067
4068 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4069
4070 static struct bfd_link_hash_table *
4071 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4072 {
4073 struct bfd_link_hash_table *ret;
4074 struct elf_i386_link_hash_table *htab;
4075
4076 ret = elf_i386_link_hash_table_create (abfd);
4077 if (ret)
4078 {
4079 htab = (struct elf_i386_link_hash_table *) ret;
4080 htab->is_vxworks = 1;
4081 htab->plt0_pad_byte = 0x90;
4082 }
4083
4084 return ret;
4085 }
4086
4087
4088 #undef elf_backend_relocs_compatible
4089 #undef elf_backend_post_process_headers
4090 #undef bfd_elf32_bfd_link_hash_table_create
4091 #define bfd_elf32_bfd_link_hash_table_create \
4092 elf_i386_vxworks_link_hash_table_create
4093 #undef elf_backend_add_symbol_hook
4094 #define elf_backend_add_symbol_hook \
4095 elf_vxworks_add_symbol_hook
4096 #undef elf_backend_link_output_symbol_hook
4097 #define elf_backend_link_output_symbol_hook \
4098 elf_vxworks_link_output_symbol_hook
4099 #undef elf_backend_emit_relocs
4100 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4101 #undef elf_backend_final_write_processing
4102 #define elf_backend_final_write_processing \
4103 elf_vxworks_final_write_processing
4104
4105 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4106 define it. */
4107 #undef elf_backend_want_plt_sym
4108 #define elf_backend_want_plt_sym 1
4109
4110 #undef elf32_bed
4111 #define elf32_bed elf32_i386_vxworks_bed
4112
4113 #include "elf32-target.h"
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