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* emultempl/pe.em (debug_section_p): New bfd_map_over_sections hook.
[binutils.git] / bfd / elf32-i386.c
blobdda6e1fa22537f774d57a8141d1a9bb887102d09
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29
30 /* 386 uses REL relocations instead of RELA. */
31 #define USE_REL 1
32
33 #include "elf/i386.h"
34
35 static reloc_howto_type elf_howto_table[]=
36 {
37 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_NONE",
39 TRUE, 0x00000000, 0x00000000, FALSE),
40 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_32",
42 TRUE, 0xffffffff, 0xffffffff, FALSE),
43 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_PC32",
45 TRUE, 0xffffffff, 0xffffffff, TRUE),
46 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_GOT32",
48 TRUE, 0xffffffff, 0xffffffff, FALSE),
49 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_PLT32",
51 TRUE, 0xffffffff, 0xffffffff, TRUE),
52 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_COPY",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_RELATIVE",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTOFF",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTPC",
69 TRUE, 0xffffffff, 0xffffffff, TRUE),
70
71 /* We have a gap in the reloc numbers here.
72 R_386_standard counts the number up to this point, and
73 R_386_ext_offset is the value to subtract from a reloc type of
74 R_386_16 thru R_386_PC8 to form an index into this table. */
75 #define R_386_standard (R_386_GOTPC + 1)
76 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
77
78 /* These relocs are a GNU extension. */
79 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_IE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_LE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_GD",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_LDM",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_16",
99 TRUE, 0xffff, 0xffff, FALSE),
100 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_PC16",
102 TRUE, 0xffff, 0xffff, TRUE),
103 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_8",
105 TRUE, 0xff, 0xff, FALSE),
106 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
107 bfd_elf_generic_reloc, "R_386_PC8",
108 TRUE, 0xff, 0xff, TRUE),
109
110 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
111 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
112 /* These are common with Solaris TLS implementation. */
113 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 EMPTY_HOWTO (38),
132 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
136 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
137 FALSE, 0, 0, FALSE),
138 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_DESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141
142 /* Another gap. */
143 #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset)
144 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
145
146 /* GNU extension to record C++ vtable hierarchy. */
147 HOWTO (R_386_GNU_VTINHERIT, /* type */
148 0, /* rightshift */
149 2, /* size (0 = byte, 1 = short, 2 = long) */
150 0, /* bitsize */
151 FALSE, /* pc_relative */
152 0, /* bitpos */
153 complain_overflow_dont, /* complain_on_overflow */
154 NULL, /* special_function */
155 "R_386_GNU_VTINHERIT", /* name */
156 FALSE, /* partial_inplace */
157 0, /* src_mask */
158 0, /* dst_mask */
159 FALSE), /* pcrel_offset */
160
161 /* GNU extension to record C++ vtable member usage. */
162 HOWTO (R_386_GNU_VTENTRY, /* type */
163 0, /* rightshift */
164 2, /* size (0 = byte, 1 = short, 2 = long) */
165 0, /* bitsize */
166 FALSE, /* pc_relative */
167 0, /* bitpos */
168 complain_overflow_dont, /* complain_on_overflow */
169 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
170 "R_386_GNU_VTENTRY", /* name */
171 FALSE, /* partial_inplace */
172 0, /* src_mask */
173 0, /* dst_mask */
174 FALSE) /* pcrel_offset */
175
176 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
177
178 };
179
180 #ifdef DEBUG_GEN_RELOC
181 #define TRACE(str) \
182 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
183 #else
184 #define TRACE(str)
185 #endif
186
187 static reloc_howto_type *
188 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
189 bfd_reloc_code_real_type code)
190 {
191 switch (code)
192 {
193 case BFD_RELOC_NONE:
194 TRACE ("BFD_RELOC_NONE");
195 return &elf_howto_table[R_386_NONE];
196
197 case BFD_RELOC_32:
198 TRACE ("BFD_RELOC_32");
199 return &elf_howto_table[R_386_32];
200
201 case BFD_RELOC_CTOR:
202 TRACE ("BFD_RELOC_CTOR");
203 return &elf_howto_table[R_386_32];
204
205 case BFD_RELOC_32_PCREL:
206 TRACE ("BFD_RELOC_PC32");
207 return &elf_howto_table[R_386_PC32];
208
209 case BFD_RELOC_386_GOT32:
210 TRACE ("BFD_RELOC_386_GOT32");
211 return &elf_howto_table[R_386_GOT32];
212
213 case BFD_RELOC_386_PLT32:
214 TRACE ("BFD_RELOC_386_PLT32");
215 return &elf_howto_table[R_386_PLT32];
216
217 case BFD_RELOC_386_COPY:
218 TRACE ("BFD_RELOC_386_COPY");
219 return &elf_howto_table[R_386_COPY];
220
221 case BFD_RELOC_386_GLOB_DAT:
222 TRACE ("BFD_RELOC_386_GLOB_DAT");
223 return &elf_howto_table[R_386_GLOB_DAT];
224
225 case BFD_RELOC_386_JUMP_SLOT:
226 TRACE ("BFD_RELOC_386_JUMP_SLOT");
227 return &elf_howto_table[R_386_JUMP_SLOT];
228
229 case BFD_RELOC_386_RELATIVE:
230 TRACE ("BFD_RELOC_386_RELATIVE");
231 return &elf_howto_table[R_386_RELATIVE];
232
233 case BFD_RELOC_386_GOTOFF:
234 TRACE ("BFD_RELOC_386_GOTOFF");
235 return &elf_howto_table[R_386_GOTOFF];
236
237 case BFD_RELOC_386_GOTPC:
238 TRACE ("BFD_RELOC_386_GOTPC");
239 return &elf_howto_table[R_386_GOTPC];
240
241 /* These relocs are a GNU extension. */
242 case BFD_RELOC_386_TLS_TPOFF:
243 TRACE ("BFD_RELOC_386_TLS_TPOFF");
244 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
245
246 case BFD_RELOC_386_TLS_IE:
247 TRACE ("BFD_RELOC_386_TLS_IE");
248 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
249
250 case BFD_RELOC_386_TLS_GOTIE:
251 TRACE ("BFD_RELOC_386_TLS_GOTIE");
252 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_LE:
255 TRACE ("BFD_RELOC_386_TLS_LE");
256 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GD:
259 TRACE ("BFD_RELOC_386_TLS_GD");
260 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LDM:
263 TRACE ("BFD_RELOC_386_TLS_LDM");
264 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
265
266 case BFD_RELOC_16:
267 TRACE ("BFD_RELOC_16");
268 return &elf_howto_table[R_386_16 - R_386_ext_offset];
269
270 case BFD_RELOC_16_PCREL:
271 TRACE ("BFD_RELOC_16_PCREL");
272 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
273
274 case BFD_RELOC_8:
275 TRACE ("BFD_RELOC_8");
276 return &elf_howto_table[R_386_8 - R_386_ext_offset];
277
278 case BFD_RELOC_8_PCREL:
279 TRACE ("BFD_RELOC_8_PCREL");
280 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
281
282 /* Common with Sun TLS implementation. */
283 case BFD_RELOC_386_TLS_LDO_32:
284 TRACE ("BFD_RELOC_386_TLS_LDO_32");
285 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
286
287 case BFD_RELOC_386_TLS_IE_32:
288 TRACE ("BFD_RELOC_386_TLS_IE_32");
289 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
290
291 case BFD_RELOC_386_TLS_LE_32:
292 TRACE ("BFD_RELOC_386_TLS_LE_32");
293 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_DTPMOD32:
296 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
297 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_DTPOFF32:
300 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
301 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_TPOFF32:
304 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
305 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_GOTDESC:
308 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
309 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DESC_CALL:
312 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
313 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_DESC:
316 TRACE ("BFD_RELOC_386_TLS_DESC");
317 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
318
319 case BFD_RELOC_VTABLE_INHERIT:
320 TRACE ("BFD_RELOC_VTABLE_INHERIT");
321 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
322
323 case BFD_RELOC_VTABLE_ENTRY:
324 TRACE ("BFD_RELOC_VTABLE_ENTRY");
325 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
326
327 default:
328 break;
329 }
330
331 TRACE ("Unknown");
332 return 0;
333 }
334
335 static reloc_howto_type *
336 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
337 const char *r_name)
338 {
339 unsigned int i;
340
341 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
342 if (elf_howto_table[i].name != NULL
343 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
344 return &elf_howto_table[i];
345
346 return NULL;
347 }
348
349 static reloc_howto_type *
350 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
351 {
352 unsigned int indx;
353
354 if ((indx = r_type) >= R_386_standard
355 && ((indx = r_type - R_386_ext_offset) - R_386_standard
356 >= R_386_ext - R_386_standard)
357 && ((indx = r_type - R_386_tls_offset) - R_386_ext
358 >= R_386_tls - R_386_ext)
359 && ((indx = r_type - R_386_vt_offset) - R_386_tls
360 >= R_386_vt - R_386_tls))
361 {
362 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
363 abfd, (int) r_type);
364 indx = R_386_NONE;
365 }
366 BFD_ASSERT (elf_howto_table [indx].type == r_type);
367 return &elf_howto_table[indx];
368 }
369
370 static void
371 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
372 arelent *cache_ptr,
373 Elf_Internal_Rela *dst)
374 {
375 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
376 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
377 }
378
379 /* Return whether a symbol name implies a local label. The UnixWare
380 2.1 cc generates temporary symbols that start with .X, so we
381 recognize them here. FIXME: do other SVR4 compilers also use .X?.
382 If so, we should move the .X recognition into
383 _bfd_elf_is_local_label_name. */
384
385 static bfd_boolean
386 elf_i386_is_local_label_name (bfd *abfd, const char *name)
387 {
388 if (name[0] == '.' && name[1] == 'X')
389 return TRUE;
390
391 return _bfd_elf_is_local_label_name (abfd, name);
392 }
393 \f
394 /* Support for core dump NOTE sections. */
395
396 static bfd_boolean
397 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
398 {
399 int offset;
400 size_t size;
401
402 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
403 {
404 int pr_version = bfd_get_32 (abfd, note->descdata);
405
406 if (pr_version != 1)
407 return FALSE;
408
409 /* pr_cursig */
410 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
411
412 /* pr_pid */
413 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
414
415 /* pr_reg */
416 offset = 28;
417 size = bfd_get_32 (abfd, note->descdata + 8);
418 }
419 else
420 {
421 switch (note->descsz)
422 {
423 default:
424 return FALSE;
425
426 case 144: /* Linux/i386 */
427 /* pr_cursig */
428 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 72;
435 size = 68;
436
437 break;
438 }
439 }
440
441 /* Make a ".reg/999" section. */
442 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
443 size, note->descpos + offset);
444 }
445
446 static bfd_boolean
447 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
448 {
449 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
450 {
451 int pr_version = bfd_get_32 (abfd, note->descdata);
452
453 if (pr_version != 1)
454 return FALSE;
455
456 elf_tdata (abfd)->core_program
457 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
458 elf_tdata (abfd)->core_command
459 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
460 }
461 else
462 {
463 switch (note->descsz)
464 {
465 default:
466 return FALSE;
467
468 case 124: /* Linux/i386 elf_prpsinfo. */
469 elf_tdata (abfd)->core_program
470 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
471 elf_tdata (abfd)->core_command
472 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
473 }
474 }
475
476 /* Note that for some reason, a spurious space is tacked
477 onto the end of the args in some (at least one anyway)
478 implementations, so strip it off if it exists. */
479 {
480 char *command = elf_tdata (abfd)->core_command;
481 int n = strlen (command);
482
483 if (0 < n && command[n - 1] == ' ')
484 command[n - 1] = '\0';
485 }
486
487 return TRUE;
488 }
489 \f
490 /* Functions for the i386 ELF linker.
491
492 In order to gain some understanding of code in this file without
493 knowing all the intricate details of the linker, note the
494 following:
495
496 Functions named elf_i386_* are called by external routines, other
497 functions are only called locally. elf_i386_* functions appear
498 in this file more or less in the order in which they are called
499 from external routines. eg. elf_i386_check_relocs is called
500 early in the link process, elf_i386_finish_dynamic_sections is
501 one of the last functions. */
502
503
504 /* The name of the dynamic interpreter. This is put in the .interp
505 section. */
506
507 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
508
509 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
510 copying dynamic variables from a shared lib into an app's dynbss
511 section, and instead use a dynamic relocation to point into the
512 shared lib. */
513 #define ELIMINATE_COPY_RELOCS 1
514
515 /* The size in bytes of an entry in the procedure linkage table. */
516
517 #define PLT_ENTRY_SIZE 16
518
519 /* The first entry in an absolute procedure linkage table looks like
520 this. See the SVR4 ABI i386 supplement to see how this works.
521 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
522
523 static const bfd_byte elf_i386_plt0_entry[12] =
524 {
525 0xff, 0x35, /* pushl contents of address */
526 0, 0, 0, 0, /* replaced with address of .got + 4. */
527 0xff, 0x25, /* jmp indirect */
528 0, 0, 0, 0 /* replaced with address of .got + 8. */
529 };
530
531 /* Subsequent entries in an absolute procedure linkage table look like
532 this. */
533
534 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
535 {
536 0xff, 0x25, /* jmp indirect */
537 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
538 0x68, /* pushl immediate */
539 0, 0, 0, 0, /* replaced with offset into relocation table. */
540 0xe9, /* jmp relative */
541 0, 0, 0, 0 /* replaced with offset to start of .plt. */
542 };
543
544 /* The first entry in a PIC procedure linkage table look like this.
545 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
546
547 static const bfd_byte elf_i386_pic_plt0_entry[12] =
548 {
549 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
550 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
551 };
552
553 /* Subsequent entries in a PIC procedure linkage table look like this. */
554
555 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
556 {
557 0xff, 0xa3, /* jmp *offset(%ebx) */
558 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
559 0x68, /* pushl immediate */
560 0, 0, 0, 0, /* replaced with offset into relocation table. */
561 0xe9, /* jmp relative */
562 0, 0, 0, 0 /* replaced with offset to start of .plt. */
563 };
564
565 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
566 for the PLTResolve stub and then for each PLT entry. */
567 #define PLTRESOLVE_RELOCS_SHLIB 0
568 #define PLTRESOLVE_RELOCS 2
569 #define PLT_NON_JUMP_SLOT_RELOCS 2
570
571 /* The i386 linker needs to keep track of the number of relocs that it
572 decides to copy as dynamic relocs in check_relocs for each symbol.
573 This is so that it can later discard them if they are found to be
574 unnecessary. We store the information in a field extending the
575 regular ELF linker hash table. */
576
577 struct elf_i386_dyn_relocs
578 {
579 struct elf_i386_dyn_relocs *next;
580
581 /* The input section of the reloc. */
582 asection *sec;
583
584 /* Total number of relocs copied for the input section. */
585 bfd_size_type count;
586
587 /* Number of pc-relative relocs copied for the input section. */
588 bfd_size_type pc_count;
589 };
590
591 /* i386 ELF linker hash entry. */
592
593 struct elf_i386_link_hash_entry
594 {
595 struct elf_link_hash_entry elf;
596
597 /* Track dynamic relocs copied for this symbol. */
598 struct elf_i386_dyn_relocs *dyn_relocs;
599
600 #define GOT_UNKNOWN 0
601 #define GOT_NORMAL 1
602 #define GOT_TLS_GD 2
603 #define GOT_TLS_IE 4
604 #define GOT_TLS_IE_POS 5
605 #define GOT_TLS_IE_NEG 6
606 #define GOT_TLS_IE_BOTH 7
607 #define GOT_TLS_GDESC 8
608 #define GOT_TLS_GD_BOTH_P(type) \
609 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
610 #define GOT_TLS_GD_P(type) \
611 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
612 #define GOT_TLS_GDESC_P(type) \
613 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
614 #define GOT_TLS_GD_ANY_P(type) \
615 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
616 unsigned char tls_type;
617
618 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
619 starting at the end of the jump table. */
620 bfd_vma tlsdesc_got;
621 };
622
623 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
624
625 struct elf_i386_obj_tdata
626 {
627 struct elf_obj_tdata root;
628
629 /* tls_type for each local got entry. */
630 char *local_got_tls_type;
631
632 /* GOTPLT entries for TLS descriptors. */
633 bfd_vma *local_tlsdesc_gotent;
634 };
635
636 #define elf_i386_tdata(abfd) \
637 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
638
639 #define elf_i386_local_got_tls_type(abfd) \
640 (elf_i386_tdata (abfd)->local_got_tls_type)
641
642 #define elf_i386_local_tlsdesc_gotent(abfd) \
643 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
644
645 #define is_i386_elf(bfd) \
646 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
647 && elf_tdata (bfd) != NULL \
648 && elf_object_id (bfd) == I386_ELF_TDATA)
649
650 static bfd_boolean
651 elf_i386_mkobject (bfd *abfd)
652 {
653 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
654 I386_ELF_TDATA);
655 }
656
657 /* i386 ELF linker hash table. */
658
659 struct elf_i386_link_hash_table
660 {
661 struct elf_link_hash_table elf;
662
663 /* Short-cuts to get to dynamic linker sections. */
664 asection *sgot;
665 asection *sgotplt;
666 asection *srelgot;
667 asection *splt;
668 asection *srelplt;
669 asection *sdynbss;
670 asection *srelbss;
671
672 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
673 asection *srelplt2;
674
675 /* True if the target system is VxWorks. */
676 int is_vxworks;
677
678 /* Value used to fill the last word of the first plt entry. */
679 bfd_byte plt0_pad_byte;
680
681 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
682 bfd_vma next_tls_desc_index;
683
684 union {
685 bfd_signed_vma refcount;
686 bfd_vma offset;
687 } tls_ldm_got;
688
689 /* The amount of space used by the reserved portion of the sgotplt
690 section, plus whatever space is used by the jump slots. */
691 bfd_vma sgotplt_jump_table_size;
692
693 /* Small local sym to section mapping cache. */
694 struct sym_sec_cache sym_sec;
695
696 /* _TLS_MODULE_BASE_ symbol. */
697 struct bfd_link_hash_entry *tls_module_base;
698 };
699
700 /* Get the i386 ELF linker hash table from a link_info structure. */
701
702 #define elf_i386_hash_table(p) \
703 ((struct elf_i386_link_hash_table *) ((p)->hash))
704
705 #define elf_i386_compute_jump_table_size(htab) \
706 ((htab)->next_tls_desc_index * 4)
707
708 /* Create an entry in an i386 ELF linker hash table. */
709
710 static struct bfd_hash_entry *
711 link_hash_newfunc (struct bfd_hash_entry *entry,
712 struct bfd_hash_table *table,
713 const char *string)
714 {
715 /* Allocate the structure if it has not already been allocated by a
716 subclass. */
717 if (entry == NULL)
718 {
719 entry = bfd_hash_allocate (table,
720 sizeof (struct elf_i386_link_hash_entry));
721 if (entry == NULL)
722 return entry;
723 }
724
725 /* Call the allocation method of the superclass. */
726 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
727 if (entry != NULL)
728 {
729 struct elf_i386_link_hash_entry *eh;
730
731 eh = (struct elf_i386_link_hash_entry *) entry;
732 eh->dyn_relocs = NULL;
733 eh->tls_type = GOT_UNKNOWN;
734 eh->tlsdesc_got = (bfd_vma) -1;
735 }
736
737 return entry;
738 }
739
740 /* Create an i386 ELF linker hash table. */
741
742 static struct bfd_link_hash_table *
743 elf_i386_link_hash_table_create (bfd *abfd)
744 {
745 struct elf_i386_link_hash_table *ret;
746 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
747
748 ret = bfd_malloc (amt);
749 if (ret == NULL)
750 return NULL;
751
752 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
753 sizeof (struct elf_i386_link_hash_entry)))
754 {
755 free (ret);
756 return NULL;
757 }
758
759 ret->sgot = NULL;
760 ret->sgotplt = NULL;
761 ret->srelgot = NULL;
762 ret->splt = NULL;
763 ret->srelplt = NULL;
764 ret->sdynbss = NULL;
765 ret->srelbss = NULL;
766 ret->tls_ldm_got.refcount = 0;
767 ret->next_tls_desc_index = 0;
768 ret->sgotplt_jump_table_size = 0;
769 ret->sym_sec.abfd = NULL;
770 ret->is_vxworks = 0;
771 ret->srelplt2 = NULL;
772 ret->plt0_pad_byte = 0;
773 ret->tls_module_base = NULL;
774
775 return &ret->elf.root;
776 }
777
778 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
779 shortcuts to them in our hash table. */
780
781 static bfd_boolean
782 create_got_section (bfd *dynobj, struct bfd_link_info *info)
783 {
784 struct elf_i386_link_hash_table *htab;
785
786 if (! _bfd_elf_create_got_section (dynobj, info))
787 return FALSE;
788
789 htab = elf_i386_hash_table (info);
790 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
791 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
792 if (!htab->sgot || !htab->sgotplt)
793 abort ();
794
795 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
796 (SEC_ALLOC | SEC_LOAD
797 | SEC_HAS_CONTENTS
798 | SEC_IN_MEMORY
799 | SEC_LINKER_CREATED
800 | SEC_READONLY));
801 if (htab->srelgot == NULL
802 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
803 return FALSE;
804 return TRUE;
805 }
806
807 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
808 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
809 hash table. */
810
811 static bfd_boolean
812 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
813 {
814 struct elf_i386_link_hash_table *htab;
815
816 htab = elf_i386_hash_table (info);
817 if (!htab->sgot && !create_got_section (dynobj, info))
818 return FALSE;
819
820 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
821 return FALSE;
822
823 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
824 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
825 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
826 if (!info->shared)
827 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
828
829 if (!htab->splt || !htab->srelplt || !htab->sdynbss
830 || (!info->shared && !htab->srelbss))
831 abort ();
832
833 if (htab->is_vxworks
834 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2))
835 return FALSE;
836
837 return TRUE;
838 }
839
840 /* Copy the extra info we tack onto an elf_link_hash_entry. */
841
842 static void
843 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
844 struct elf_link_hash_entry *dir,
845 struct elf_link_hash_entry *ind)
846 {
847 struct elf_i386_link_hash_entry *edir, *eind;
848
849 edir = (struct elf_i386_link_hash_entry *) dir;
850 eind = (struct elf_i386_link_hash_entry *) ind;
851
852 if (eind->dyn_relocs != NULL)
853 {
854 if (edir->dyn_relocs != NULL)
855 {
856 struct elf_i386_dyn_relocs **pp;
857 struct elf_i386_dyn_relocs *p;
858
859 /* Add reloc counts against the indirect sym to the direct sym
860 list. Merge any entries against the same section. */
861 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
862 {
863 struct elf_i386_dyn_relocs *q;
864
865 for (q = edir->dyn_relocs; q != NULL; q = q->next)
866 if (q->sec == p->sec)
867 {
868 q->pc_count += p->pc_count;
869 q->count += p->count;
870 *pp = p->next;
871 break;
872 }
873 if (q == NULL)
874 pp = &p->next;
875 }
876 *pp = edir->dyn_relocs;
877 }
878
879 edir->dyn_relocs = eind->dyn_relocs;
880 eind->dyn_relocs = NULL;
881 }
882
883 if (ind->root.type == bfd_link_hash_indirect
884 && dir->got.refcount <= 0)
885 {
886 edir->tls_type = eind->tls_type;
887 eind->tls_type = GOT_UNKNOWN;
888 }
889
890 if (ELIMINATE_COPY_RELOCS
891 && ind->root.type != bfd_link_hash_indirect
892 && dir->dynamic_adjusted)
893 {
894 /* If called to transfer flags for a weakdef during processing
895 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
896 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
897 dir->ref_dynamic |= ind->ref_dynamic;
898 dir->ref_regular |= ind->ref_regular;
899 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
900 dir->needs_plt |= ind->needs_plt;
901 dir->pointer_equality_needed |= ind->pointer_equality_needed;
902 }
903 else
904 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
905 }
906
907 typedef union
908 {
909 unsigned char c[2];
910 uint16_t i;
911 }
912 i386_opcode16;
913
914 /* Return TRUE if the TLS access code sequence support transition
915 from R_TYPE. */
916
917 static bfd_boolean
918 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
919 bfd_byte *contents,
920 Elf_Internal_Shdr *symtab_hdr,
921 struct elf_link_hash_entry **sym_hashes,
922 unsigned int r_type,
923 const Elf_Internal_Rela *rel,
924 const Elf_Internal_Rela *relend)
925 {
926 unsigned int val, type;
927 unsigned long r_symndx;
928 struct elf_link_hash_entry *h;
929 bfd_vma offset;
930
931 /* Get the section contents. */
932 if (contents == NULL)
933 {
934 if (elf_section_data (sec)->this_hdr.contents != NULL)
935 contents = elf_section_data (sec)->this_hdr.contents;
936 else
937 {
938 /* FIXME: How to better handle error condition? */
939 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
940 return FALSE;
941
942 /* Cache the section contents for elf_link_input_bfd. */
943 elf_section_data (sec)->this_hdr.contents = contents;
944 }
945 }
946
947 offset = rel->r_offset;
948 switch (r_type)
949 {
950 case R_386_TLS_GD:
951 case R_386_TLS_LDM:
952 if (offset < 2 || (rel + 1) >= relend)
953 return FALSE;
954
955 type = bfd_get_8 (abfd, contents + offset - 2);
956 if (r_type == R_386_TLS_GD)
957 {
958 /* Check transition from LD access model. Only
959 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
960 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
961 can transit to different access model. */
962 if ((offset + 10) > sec->size ||
963 (type != 0x8d && type != 0x04))
964 return FALSE;
965
966 val = bfd_get_8 (abfd, contents + offset - 1);
967 if (type == 0x04)
968 {
969 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
970 if (offset < 3)
971 return FALSE;
972
973 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
974 return FALSE;
975
976 if ((val & 0xc7) != 0x05 || val == (4 << 3))
977 return FALSE;
978 }
979 else
980 {
981 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
982 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
983 return FALSE;
984
985 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
986 return FALSE;
987 }
988 }
989 else
990 {
991 /* Check transition from LD access model. Only
992 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
993 can transit to different access model. */
994 if (type != 0x8d || (offset + 9) > sec->size)
995 return FALSE;
996
997 val = bfd_get_8 (abfd, contents + offset - 1);
998 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
999 return FALSE;
1000 }
1001
1002 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1003 return FALSE;
1004
1005 r_symndx = ELF32_R_SYM (rel[1].r_info);
1006 if (r_symndx < symtab_hdr->sh_info)
1007 return FALSE;
1008
1009 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1010 return (h != NULL
1011 && h->root.root.string != NULL
1012 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1013 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1014 && (strcmp (h->root.root.string, "___tls_get_addr") == 0));
1015
1016 case R_386_TLS_IE:
1017 /* Check transition from IE access model:
1018 movl foo@indntpoff(%rip), %eax
1019 movl foo@indntpoff(%rip), %reg
1020 addl foo@indntpoff(%rip), %reg
1021 */
1022
1023 if (offset < 1 || (offset + 4) > sec->size)
1024 return FALSE;
1025
1026 /* Check "movl foo@tpoff(%rip), %eax" first. */
1027 val = bfd_get_8 (abfd, contents + offset - 1);
1028 if (val == 0xa1)
1029 return TRUE;
1030
1031 if (offset < 2)
1032 return FALSE;
1033
1034 /* Check movl|addl foo@tpoff(%rip), %reg. */
1035 type = bfd_get_8 (abfd, contents + offset - 2);
1036 return ((type == 0x8b || type == 0x03)
1037 && (val & 0xc7) == 0x05);
1038
1039 case R_386_TLS_GOTIE:
1040 case R_386_TLS_IE_32:
1041 /* Check transition from {IE_32,GOTIE} access model:
1042 subl foo@{tpoff,gontoff}(%reg1), %reg2
1043 movl foo@{tpoff,gontoff}(%reg1), %reg2
1044 addl foo@{tpoff,gontoff}(%reg1), %reg2
1045 */
1046
1047 if (offset < 2 || (offset + 4) > sec->size)
1048 return FALSE;
1049
1050 val = bfd_get_8 (abfd, contents + offset - 1);
1051 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1052 return FALSE;
1053
1054 type = bfd_get_8 (abfd, contents + offset - 2);
1055 return type == 0x8b || type == 0x2b || type == 0x03;
1056
1057 case R_386_TLS_GOTDESC:
1058 /* Check transition from GDesc access model:
1059 leal x@tlsdesc(%ebx), %eax
1060
1061 Make sure it's a leal adding ebx to a 32-bit offset
1062 into any register, although it's probably almost always
1063 going to be eax. */
1064
1065 if (offset < 2 || (offset + 4) > sec->size)
1066 return FALSE;
1067
1068 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1069 return FALSE;
1070
1071 val = bfd_get_8 (abfd, contents + offset - 1);
1072 return (val & 0xc7) == 0x83;
1073
1074 case R_386_TLS_DESC_CALL:
1075 /* Check transition from GDesc access model:
1076 call *x@tlsdesc(%rax)
1077 */
1078 if (offset + 2 <= sec->size)
1079 {
1080 /* Make sure that it's a call *x@tlsdesc(%rax). */
1081 static i386_opcode16 call = { { 0xff, 0x10 } };
1082 return bfd_get_16 (abfd, contents + offset) == call.i;
1083 }
1084
1085 return FALSE;
1086
1087 default:
1088 abort ();
1089 }
1090 }
1091
1092 /* Return TRUE if the TLS access transition is OK or no transition
1093 will be performed. Update R_TYPE if there is a transition. */
1094
1095 static bfd_boolean
1096 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1097 asection *sec, bfd_byte *contents,
1098 Elf_Internal_Shdr *symtab_hdr,
1099 struct elf_link_hash_entry **sym_hashes,
1100 unsigned int *r_type, int tls_type,
1101 const Elf_Internal_Rela *rel,
1102 const Elf_Internal_Rela *relend,
1103 struct elf_link_hash_entry *h)
1104 {
1105 unsigned int from_type = *r_type;
1106 unsigned int to_type = from_type;
1107 bfd_boolean check = TRUE;
1108
1109 switch (from_type)
1110 {
1111 case R_386_TLS_GD:
1112 case R_386_TLS_GOTDESC:
1113 case R_386_TLS_DESC_CALL:
1114 case R_386_TLS_IE_32:
1115 case R_386_TLS_IE:
1116 case R_386_TLS_GOTIE:
1117 if (!info->shared)
1118 {
1119 if (h == NULL)
1120 to_type = R_386_TLS_LE_32;
1121 else if (from_type != R_386_TLS_IE
1122 && from_type != R_386_TLS_GOTIE)
1123 to_type = R_386_TLS_IE_32;
1124 }
1125
1126 /* When we are called from elf_i386_relocate_section, CONTENTS
1127 isn't NULL and there may be additional transitions based on
1128 TLS_TYPE. */
1129 if (contents != NULL)
1130 {
1131 unsigned int new_to_type = to_type;
1132
1133 if (!info->shared
1134 && h != NULL
1135 && h->dynindx == -1
1136 && (tls_type & GOT_TLS_IE))
1137 new_to_type = R_386_TLS_LE_32;
1138
1139 if (to_type == R_386_TLS_GD
1140 || to_type == R_386_TLS_GOTDESC
1141 || to_type == R_386_TLS_DESC_CALL)
1142 {
1143 if (tls_type == GOT_TLS_IE_POS)
1144 new_to_type = R_386_TLS_GOTIE;
1145 else if (tls_type & GOT_TLS_IE)
1146 new_to_type = R_386_TLS_IE_32;
1147 }
1148
1149 /* We checked the transition before when we were called from
1150 elf_i386_check_relocs. We only want to check the new
1151 transition which hasn't been checked before. */
1152 check = new_to_type != to_type && from_type == to_type;
1153 to_type = new_to_type;
1154 }
1155
1156 break;
1157
1158 case R_386_TLS_LDM:
1159 if (!info->shared)
1160 to_type = R_386_TLS_LE_32;
1161 break;
1162
1163 default:
1164 return TRUE;
1165 }
1166
1167 /* Return TRUE if there is no transition. */
1168 if (from_type == to_type)
1169 return TRUE;
1170
1171 /* Check if the transition can be performed. */
1172 if (check
1173 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1174 symtab_hdr, sym_hashes,
1175 from_type, rel, relend))
1176 {
1177 reloc_howto_type *from, *to;
1178
1179 from = elf_i386_rtype_to_howto (abfd, from_type);
1180 to = elf_i386_rtype_to_howto (abfd, to_type);
1181
1182 (*_bfd_error_handler)
1183 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1184 "in section `%A' failed"),
1185 abfd, sec, from->name, to->name,
1186 h ? h->root.root.string : "a local symbol",
1187 (unsigned long) rel->r_offset);
1188 bfd_set_error (bfd_error_bad_value);
1189 return FALSE;
1190 }
1191
1192 *r_type = to_type;
1193 return TRUE;
1194 }
1195
1196 /* Look through the relocs for a section during the first phase, and
1197 calculate needed space in the global offset table, procedure linkage
1198 table, and dynamic reloc sections. */
1199
1200 static bfd_boolean
1201 elf_i386_check_relocs (bfd *abfd,
1202 struct bfd_link_info *info,
1203 asection *sec,
1204 const Elf_Internal_Rela *relocs)
1205 {
1206 struct elf_i386_link_hash_table *htab;
1207 Elf_Internal_Shdr *symtab_hdr;
1208 struct elf_link_hash_entry **sym_hashes;
1209 const Elf_Internal_Rela *rel;
1210 const Elf_Internal_Rela *rel_end;
1211 asection *sreloc;
1212
1213 if (info->relocatable)
1214 return TRUE;
1215
1216 BFD_ASSERT (is_i386_elf (abfd));
1217
1218 htab = elf_i386_hash_table (info);
1219 symtab_hdr = &elf_symtab_hdr (abfd);
1220 sym_hashes = elf_sym_hashes (abfd);
1221
1222 sreloc = NULL;
1223
1224 rel_end = relocs + sec->reloc_count;
1225 for (rel = relocs; rel < rel_end; rel++)
1226 {
1227 unsigned int r_type;
1228 unsigned long r_symndx;
1229 struct elf_link_hash_entry *h;
1230
1231 r_symndx = ELF32_R_SYM (rel->r_info);
1232 r_type = ELF32_R_TYPE (rel->r_info);
1233
1234 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1235 {
1236 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1237 abfd,
1238 r_symndx);
1239 return FALSE;
1240 }
1241
1242 if (r_symndx < symtab_hdr->sh_info)
1243 h = NULL;
1244 else
1245 {
1246 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1247 while (h->root.type == bfd_link_hash_indirect
1248 || h->root.type == bfd_link_hash_warning)
1249 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1250 }
1251
1252 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1253 symtab_hdr, sym_hashes,
1254 &r_type, GOT_UNKNOWN,
1255 rel, rel_end, h))
1256 return FALSE;
1257
1258 switch (r_type)
1259 {
1260 case R_386_TLS_LDM:
1261 htab->tls_ldm_got.refcount += 1;
1262 goto create_got;
1263
1264 case R_386_PLT32:
1265 /* This symbol requires a procedure linkage table entry. We
1266 actually build the entry in adjust_dynamic_symbol,
1267 because this might be a case of linking PIC code which is
1268 never referenced by a dynamic object, in which case we
1269 don't need to generate a procedure linkage table entry
1270 after all. */
1271
1272 /* If this is a local symbol, we resolve it directly without
1273 creating a procedure linkage table entry. */
1274 if (h == NULL)
1275 continue;
1276
1277 h->needs_plt = 1;
1278 h->plt.refcount += 1;
1279 break;
1280
1281 case R_386_TLS_IE_32:
1282 case R_386_TLS_IE:
1283 case R_386_TLS_GOTIE:
1284 if (info->shared)
1285 info->flags |= DF_STATIC_TLS;
1286 /* Fall through */
1287
1288 case R_386_GOT32:
1289 case R_386_TLS_GD:
1290 case R_386_TLS_GOTDESC:
1291 case R_386_TLS_DESC_CALL:
1292 /* This symbol requires a global offset table entry. */
1293 {
1294 int tls_type, old_tls_type;
1295
1296 switch (r_type)
1297 {
1298 default:
1299 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1300 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1301 case R_386_TLS_GOTDESC:
1302 case R_386_TLS_DESC_CALL:
1303 tls_type = GOT_TLS_GDESC; break;
1304 case R_386_TLS_IE_32:
1305 if (ELF32_R_TYPE (rel->r_info) == r_type)
1306 tls_type = GOT_TLS_IE_NEG;
1307 else
1308 /* If this is a GD->IE transition, we may use either of
1309 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1310 tls_type = GOT_TLS_IE;
1311 break;
1312 case R_386_TLS_IE:
1313 case R_386_TLS_GOTIE:
1314 tls_type = GOT_TLS_IE_POS; break;
1315 }
1316
1317 if (h != NULL)
1318 {
1319 h->got.refcount += 1;
1320 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1321 }
1322 else
1323 {
1324 bfd_signed_vma *local_got_refcounts;
1325
1326 /* This is a global offset table entry for a local symbol. */
1327 local_got_refcounts = elf_local_got_refcounts (abfd);
1328 if (local_got_refcounts == NULL)
1329 {
1330 bfd_size_type size;
1331
1332 size = symtab_hdr->sh_info;
1333 size *= (sizeof (bfd_signed_vma)
1334 + sizeof (bfd_vma) + sizeof(char));
1335 local_got_refcounts = bfd_zalloc (abfd, size);
1336 if (local_got_refcounts == NULL)
1337 return FALSE;
1338 elf_local_got_refcounts (abfd) = local_got_refcounts;
1339 elf_i386_local_tlsdesc_gotent (abfd)
1340 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1341 elf_i386_local_got_tls_type (abfd)
1342 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1343 }
1344 local_got_refcounts[r_symndx] += 1;
1345 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1346 }
1347
1348 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1349 tls_type |= old_tls_type;
1350 /* If a TLS symbol is accessed using IE at least once,
1351 there is no point to use dynamic model for it. */
1352 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1353 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1354 || (tls_type & GOT_TLS_IE) == 0))
1355 {
1356 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1357 tls_type = old_tls_type;
1358 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1359 && GOT_TLS_GD_ANY_P (tls_type))
1360 tls_type |= old_tls_type;
1361 else
1362 {
1363 (*_bfd_error_handler)
1364 (_("%B: `%s' accessed both as normal and "
1365 "thread local symbol"),
1366 abfd,
1367 h ? h->root.root.string : "<local>");
1368 return FALSE;
1369 }
1370 }
1371
1372 if (old_tls_type != tls_type)
1373 {
1374 if (h != NULL)
1375 elf_i386_hash_entry (h)->tls_type = tls_type;
1376 else
1377 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1378 }
1379 }
1380 /* Fall through */
1381
1382 case R_386_GOTOFF:
1383 case R_386_GOTPC:
1384 create_got:
1385 if (htab->sgot == NULL)
1386 {
1387 if (htab->elf.dynobj == NULL)
1388 htab->elf.dynobj = abfd;
1389 if (!create_got_section (htab->elf.dynobj, info))
1390 return FALSE;
1391 }
1392 if (r_type != R_386_TLS_IE)
1393 break;
1394 /* Fall through */
1395
1396 case R_386_TLS_LE_32:
1397 case R_386_TLS_LE:
1398 if (!info->shared)
1399 break;
1400 info->flags |= DF_STATIC_TLS;
1401 /* Fall through */
1402
1403 case R_386_32:
1404 case R_386_PC32:
1405 if (h != NULL && !info->shared)
1406 {
1407 /* If this reloc is in a read-only section, we might
1408 need a copy reloc. We can't check reliably at this
1409 stage whether the section is read-only, as input
1410 sections have not yet been mapped to output sections.
1411 Tentatively set the flag for now, and correct in
1412 adjust_dynamic_symbol. */
1413 h->non_got_ref = 1;
1414
1415 /* We may need a .plt entry if the function this reloc
1416 refers to is in a shared lib. */
1417 h->plt.refcount += 1;
1418 if (r_type != R_386_PC32)
1419 h->pointer_equality_needed = 1;
1420 }
1421
1422 /* If we are creating a shared library, and this is a reloc
1423 against a global symbol, or a non PC relative reloc
1424 against a local symbol, then we need to copy the reloc
1425 into the shared library. However, if we are linking with
1426 -Bsymbolic, we do not need to copy a reloc against a
1427 global symbol which is defined in an object we are
1428 including in the link (i.e., DEF_REGULAR is set). At
1429 this point we have not seen all the input files, so it is
1430 possible that DEF_REGULAR is not set now but will be set
1431 later (it is never cleared). In case of a weak definition,
1432 DEF_REGULAR may be cleared later by a strong definition in
1433 a shared library. We account for that possibility below by
1434 storing information in the relocs_copied field of the hash
1435 table entry. A similar situation occurs when creating
1436 shared libraries and symbol visibility changes render the
1437 symbol local.
1438
1439 If on the other hand, we are creating an executable, we
1440 may need to keep relocations for symbols satisfied by a
1441 dynamic library if we manage to avoid copy relocs for the
1442 symbol. */
1443 if ((info->shared
1444 && (sec->flags & SEC_ALLOC) != 0
1445 && (r_type != R_386_PC32
1446 || (h != NULL
1447 && (! SYMBOLIC_BIND (info, h)
1448 || h->root.type == bfd_link_hash_defweak
1449 || !h->def_regular))))
1450 || (ELIMINATE_COPY_RELOCS
1451 && !info->shared
1452 && (sec->flags & SEC_ALLOC) != 0
1453 && h != NULL
1454 && (h->root.type == bfd_link_hash_defweak
1455 || !h->def_regular)))
1456 {
1457 struct elf_i386_dyn_relocs *p;
1458 struct elf_i386_dyn_relocs **head;
1459
1460 /* We must copy these reloc types into the output file.
1461 Create a reloc section in dynobj and make room for
1462 this reloc. */
1463 if (sreloc == NULL)
1464 {
1465 if (htab->elf.dynobj == NULL)
1466 htab->elf.dynobj = abfd;
1467
1468 sreloc = _bfd_elf_make_dynamic_reloc_section
1469 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1470
1471 if (sreloc == NULL)
1472 return FALSE;
1473 }
1474
1475 /* If this is a global symbol, we count the number of
1476 relocations we need for this symbol. */
1477 if (h != NULL)
1478 {
1479 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1480 }
1481 else
1482 {
1483 void **vpp;
1484 /* Track dynamic relocs needed for local syms too.
1485 We really need local syms available to do this
1486 easily. Oh well. */
1487
1488 asection *s;
1489 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1490 sec, r_symndx);
1491 if (s == NULL)
1492 return FALSE;
1493
1494 vpp = &elf_section_data (s)->local_dynrel;
1495 head = (struct elf_i386_dyn_relocs **)vpp;
1496 }
1497
1498 p = *head;
1499 if (p == NULL || p->sec != sec)
1500 {
1501 bfd_size_type amt = sizeof *p;
1502 p = bfd_alloc (htab->elf.dynobj, amt);
1503 if (p == NULL)
1504 return FALSE;
1505 p->next = *head;
1506 *head = p;
1507 p->sec = sec;
1508 p->count = 0;
1509 p->pc_count = 0;
1510 }
1511
1512 p->count += 1;
1513 if (r_type == R_386_PC32)
1514 p->pc_count += 1;
1515 }
1516 break;
1517
1518 /* This relocation describes the C++ object vtable hierarchy.
1519 Reconstruct it for later use during GC. */
1520 case R_386_GNU_VTINHERIT:
1521 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1522 return FALSE;
1523 break;
1524
1525 /* This relocation describes which C++ vtable entries are actually
1526 used. Record for later use during GC. */
1527 case R_386_GNU_VTENTRY:
1528 BFD_ASSERT (h != NULL);
1529 if (h != NULL
1530 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1531 return FALSE;
1532 break;
1533
1534 default:
1535 break;
1536 }
1537 }
1538
1539 return TRUE;
1540 }
1541
1542 /* Return the section that should be marked against GC for a given
1543 relocation. */
1544
1545 static asection *
1546 elf_i386_gc_mark_hook (asection *sec,
1547 struct bfd_link_info *info,
1548 Elf_Internal_Rela *rel,
1549 struct elf_link_hash_entry *h,
1550 Elf_Internal_Sym *sym)
1551 {
1552 if (h != NULL)
1553 switch (ELF32_R_TYPE (rel->r_info))
1554 {
1555 case R_386_GNU_VTINHERIT:
1556 case R_386_GNU_VTENTRY:
1557 return NULL;
1558 }
1559
1560 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1561 }
1562
1563 /* Update the got entry reference counts for the section being removed. */
1564
1565 static bfd_boolean
1566 elf_i386_gc_sweep_hook (bfd *abfd,
1567 struct bfd_link_info *info,
1568 asection *sec,
1569 const Elf_Internal_Rela *relocs)
1570 {
1571 Elf_Internal_Shdr *symtab_hdr;
1572 struct elf_link_hash_entry **sym_hashes;
1573 bfd_signed_vma *local_got_refcounts;
1574 const Elf_Internal_Rela *rel, *relend;
1575
1576 if (info->relocatable)
1577 return TRUE;
1578
1579 elf_section_data (sec)->local_dynrel = NULL;
1580
1581 symtab_hdr = &elf_symtab_hdr (abfd);
1582 sym_hashes = elf_sym_hashes (abfd);
1583 local_got_refcounts = elf_local_got_refcounts (abfd);
1584
1585 relend = relocs + sec->reloc_count;
1586 for (rel = relocs; rel < relend; rel++)
1587 {
1588 unsigned long r_symndx;
1589 unsigned int r_type;
1590 struct elf_link_hash_entry *h = NULL;
1591
1592 r_symndx = ELF32_R_SYM (rel->r_info);
1593 if (r_symndx >= symtab_hdr->sh_info)
1594 {
1595 struct elf_i386_link_hash_entry *eh;
1596 struct elf_i386_dyn_relocs **pp;
1597 struct elf_i386_dyn_relocs *p;
1598
1599 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1600 while (h->root.type == bfd_link_hash_indirect
1601 || h->root.type == bfd_link_hash_warning)
1602 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1603 eh = (struct elf_i386_link_hash_entry *) h;
1604
1605 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1606 if (p->sec == sec)
1607 {
1608 /* Everything must go for SEC. */
1609 *pp = p->next;
1610 break;
1611 }
1612 }
1613
1614 r_type = ELF32_R_TYPE (rel->r_info);
1615 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1616 symtab_hdr, sym_hashes,
1617 &r_type, GOT_UNKNOWN,
1618 rel, relend, h))
1619 return FALSE;
1620
1621 switch (r_type)
1622 {
1623 case R_386_TLS_LDM:
1624 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1625 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1626 break;
1627
1628 case R_386_TLS_GD:
1629 case R_386_TLS_GOTDESC:
1630 case R_386_TLS_DESC_CALL:
1631 case R_386_TLS_IE_32:
1632 case R_386_TLS_IE:
1633 case R_386_TLS_GOTIE:
1634 case R_386_GOT32:
1635 if (h != NULL)
1636 {
1637 if (h->got.refcount > 0)
1638 h->got.refcount -= 1;
1639 }
1640 else if (local_got_refcounts != NULL)
1641 {
1642 if (local_got_refcounts[r_symndx] > 0)
1643 local_got_refcounts[r_symndx] -= 1;
1644 }
1645 break;
1646
1647 case R_386_32:
1648 case R_386_PC32:
1649 if (info->shared)
1650 break;
1651 /* Fall through */
1652
1653 case R_386_PLT32:
1654 if (h != NULL)
1655 {
1656 if (h->plt.refcount > 0)
1657 h->plt.refcount -= 1;
1658 }
1659 break;
1660
1661 default:
1662 break;
1663 }
1664 }
1665
1666 return TRUE;
1667 }
1668
1669 /* Adjust a symbol defined by a dynamic object and referenced by a
1670 regular object. The current definition is in some section of the
1671 dynamic object, but we're not including those sections. We have to
1672 change the definition to something the rest of the link can
1673 understand. */
1674
1675 static bfd_boolean
1676 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1677 struct elf_link_hash_entry *h)
1678 {
1679 struct elf_i386_link_hash_table *htab;
1680 asection *s;
1681
1682 /* If this is a function, put it in the procedure linkage table. We
1683 will fill in the contents of the procedure linkage table later,
1684 when we know the address of the .got section. */
1685 if (h->type == STT_FUNC
1686 || h->needs_plt)
1687 {
1688 if (h->plt.refcount <= 0
1689 || SYMBOL_CALLS_LOCAL (info, h)
1690 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1691 && h->root.type == bfd_link_hash_undefweak))
1692 {
1693 /* This case can occur if we saw a PLT32 reloc in an input
1694 file, but the symbol was never referred to by a dynamic
1695 object, or if all references were garbage collected. In
1696 such a case, we don't actually need to build a procedure
1697 linkage table, and we can just do a PC32 reloc instead. */
1698 h->plt.offset = (bfd_vma) -1;
1699 h->needs_plt = 0;
1700 }
1701
1702 return TRUE;
1703 }
1704 else
1705 /* It's possible that we incorrectly decided a .plt reloc was
1706 needed for an R_386_PC32 reloc to a non-function sym in
1707 check_relocs. We can't decide accurately between function and
1708 non-function syms in check-relocs; Objects loaded later in
1709 the link may change h->type. So fix it now. */
1710 h->plt.offset = (bfd_vma) -1;
1711
1712 /* If this is a weak symbol, and there is a real definition, the
1713 processor independent code will have arranged for us to see the
1714 real definition first, and we can just use the same value. */
1715 if (h->u.weakdef != NULL)
1716 {
1717 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1718 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1719 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1720 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1721 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1722 h->non_got_ref = h->u.weakdef->non_got_ref;
1723 return TRUE;
1724 }
1725
1726 /* This is a reference to a symbol defined by a dynamic object which
1727 is not a function. */
1728
1729 /* If we are creating a shared library, we must presume that the
1730 only references to the symbol are via the global offset table.
1731 For such cases we need not do anything here; the relocations will
1732 be handled correctly by relocate_section. */
1733 if (info->shared)
1734 return TRUE;
1735
1736 /* If there are no references to this symbol that do not use the
1737 GOT, we don't need to generate a copy reloc. */
1738 if (!h->non_got_ref)
1739 return TRUE;
1740
1741 /* If -z nocopyreloc was given, we won't generate them either. */
1742 if (info->nocopyreloc)
1743 {
1744 h->non_got_ref = 0;
1745 return TRUE;
1746 }
1747
1748 htab = elf_i386_hash_table (info);
1749
1750 /* If there aren't any dynamic relocs in read-only sections, then
1751 we can keep the dynamic relocs and avoid the copy reloc. This
1752 doesn't work on VxWorks, where we can not have dynamic relocations
1753 (other than copy and jump slot relocations) in an executable. */
1754 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1755 {
1756 struct elf_i386_link_hash_entry * eh;
1757 struct elf_i386_dyn_relocs *p;
1758
1759 eh = (struct elf_i386_link_hash_entry *) h;
1760 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1761 {
1762 s = p->sec->output_section;
1763 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1764 break;
1765 }
1766
1767 if (p == NULL)
1768 {
1769 h->non_got_ref = 0;
1770 return TRUE;
1771 }
1772 }
1773
1774 if (h->size == 0)
1775 {
1776 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1777 h->root.root.string);
1778 return TRUE;
1779 }
1780
1781 /* We must allocate the symbol in our .dynbss section, which will
1782 become part of the .bss section of the executable. There will be
1783 an entry for this symbol in the .dynsym section. The dynamic
1784 object will contain position independent code, so all references
1785 from the dynamic object to this symbol will go through the global
1786 offset table. The dynamic linker will use the .dynsym entry to
1787 determine the address it must put in the global offset table, so
1788 both the dynamic object and the regular object will refer to the
1789 same memory location for the variable. */
1790
1791 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1792 copy the initial value out of the dynamic object and into the
1793 runtime process image. */
1794 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1795 {
1796 htab->srelbss->size += sizeof (Elf32_External_Rel);
1797 h->needs_copy = 1;
1798 }
1799
1800 s = htab->sdynbss;
1801
1802 return _bfd_elf_adjust_dynamic_copy (h, s);
1803 }
1804
1805 /* Allocate space in .plt, .got and associated reloc sections for
1806 dynamic relocs. */
1807
1808 static bfd_boolean
1809 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1810 {
1811 struct bfd_link_info *info;
1812 struct elf_i386_link_hash_table *htab;
1813 struct elf_i386_link_hash_entry *eh;
1814 struct elf_i386_dyn_relocs *p;
1815
1816 if (h->root.type == bfd_link_hash_indirect)
1817 return TRUE;
1818
1819 if (h->root.type == bfd_link_hash_warning)
1820 /* When warning symbols are created, they **replace** the "real"
1821 entry in the hash table, thus we never get to see the real
1822 symbol in a hash traversal. So look at it now. */
1823 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1824
1825 info = (struct bfd_link_info *) inf;
1826 htab = elf_i386_hash_table (info);
1827
1828 if (htab->elf.dynamic_sections_created
1829 && h->plt.refcount > 0)
1830 {
1831 /* Make sure this symbol is output as a dynamic symbol.
1832 Undefined weak syms won't yet be marked as dynamic. */
1833 if (h->dynindx == -1
1834 && !h->forced_local)
1835 {
1836 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1837 return FALSE;
1838 }
1839
1840 if (info->shared
1841 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1842 {
1843 asection *s = htab->splt;
1844
1845 /* If this is the first .plt entry, make room for the special
1846 first entry. */
1847 if (s->size == 0)
1848 s->size += PLT_ENTRY_SIZE;
1849
1850 h->plt.offset = s->size;
1851
1852 /* If this symbol is not defined in a regular file, and we are
1853 not generating a shared library, then set the symbol to this
1854 location in the .plt. This is required to make function
1855 pointers compare as equal between the normal executable and
1856 the shared library. */
1857 if (! info->shared
1858 && !h->def_regular)
1859 {
1860 h->root.u.def.section = s;
1861 h->root.u.def.value = h->plt.offset;
1862 }
1863
1864 /* Make room for this entry. */
1865 s->size += PLT_ENTRY_SIZE;
1866
1867 /* We also need to make an entry in the .got.plt section, which
1868 will be placed in the .got section by the linker script. */
1869 htab->sgotplt->size += 4;
1870
1871 /* We also need to make an entry in the .rel.plt section. */
1872 htab->srelplt->size += sizeof (Elf32_External_Rel);
1873 htab->next_tls_desc_index++;
1874
1875 if (htab->is_vxworks && !info->shared)
1876 {
1877 /* VxWorks has a second set of relocations for each PLT entry
1878 in executables. They go in a separate relocation section,
1879 which is processed by the kernel loader. */
1880
1881 /* There are two relocations for the initial PLT entry: an
1882 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1883 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1884
1885 if (h->plt.offset == PLT_ENTRY_SIZE)
1886 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1887
1888 /* There are two extra relocations for each subsequent PLT entry:
1889 an R_386_32 relocation for the GOT entry, and an R_386_32
1890 relocation for the PLT entry. */
1891
1892 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1893 }
1894 }
1895 else
1896 {
1897 h->plt.offset = (bfd_vma) -1;
1898 h->needs_plt = 0;
1899 }
1900 }
1901 else
1902 {
1903 h->plt.offset = (bfd_vma) -1;
1904 h->needs_plt = 0;
1905 }
1906
1907 eh = (struct elf_i386_link_hash_entry *) h;
1908 eh->tlsdesc_got = (bfd_vma) -1;
1909
1910 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1911 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1912 if (h->got.refcount > 0
1913 && !info->shared
1914 && h->dynindx == -1
1915 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1916 h->got.offset = (bfd_vma) -1;
1917 else if (h->got.refcount > 0)
1918 {
1919 asection *s;
1920 bfd_boolean dyn;
1921 int tls_type = elf_i386_hash_entry(h)->tls_type;
1922
1923 /* Make sure this symbol is output as a dynamic symbol.
1924 Undefined weak syms won't yet be marked as dynamic. */
1925 if (h->dynindx == -1
1926 && !h->forced_local)
1927 {
1928 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1929 return FALSE;
1930 }
1931
1932 s = htab->sgot;
1933 if (GOT_TLS_GDESC_P (tls_type))
1934 {
1935 eh->tlsdesc_got = htab->sgotplt->size
1936 - elf_i386_compute_jump_table_size (htab);
1937 htab->sgotplt->size += 8;
1938 h->got.offset = (bfd_vma) -2;
1939 }
1940 if (! GOT_TLS_GDESC_P (tls_type)
1941 || GOT_TLS_GD_P (tls_type))
1942 {
1943 h->got.offset = s->size;
1944 s->size += 4;
1945 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1946 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
1947 s->size += 4;
1948 }
1949 dyn = htab->elf.dynamic_sections_created;
1950 /* R_386_TLS_IE_32 needs one dynamic relocation,
1951 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1952 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1953 need two), R_386_TLS_GD needs one if local symbol and two if
1954 global. */
1955 if (tls_type == GOT_TLS_IE_BOTH)
1956 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1957 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1958 || (tls_type & GOT_TLS_IE))
1959 htab->srelgot->size += sizeof (Elf32_External_Rel);
1960 else if (GOT_TLS_GD_P (tls_type))
1961 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1962 else if (! GOT_TLS_GDESC_P (tls_type)
1963 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1964 || h->root.type != bfd_link_hash_undefweak)
1965 && (info->shared
1966 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1967 htab->srelgot->size += sizeof (Elf32_External_Rel);
1968 if (GOT_TLS_GDESC_P (tls_type))
1969 htab->srelplt->size += sizeof (Elf32_External_Rel);
1970 }
1971 else
1972 h->got.offset = (bfd_vma) -1;
1973
1974 if (eh->dyn_relocs == NULL)
1975 return TRUE;
1976
1977 /* In the shared -Bsymbolic case, discard space allocated for
1978 dynamic pc-relative relocs against symbols which turn out to be
1979 defined in regular objects. For the normal shared case, discard
1980 space for pc-relative relocs that have become local due to symbol
1981 visibility changes. */
1982
1983 if (info->shared)
1984 {
1985 /* The only reloc that uses pc_count is R_386_PC32, which will
1986 appear on a call or on something like ".long foo - .". We
1987 want calls to protected symbols to resolve directly to the
1988 function rather than going via the plt. If people want
1989 function pointer comparisons to work as expected then they
1990 should avoid writing assembly like ".long foo - .". */
1991 if (SYMBOL_CALLS_LOCAL (info, h))
1992 {
1993 struct elf_i386_dyn_relocs **pp;
1994
1995 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1996 {
1997 p->count -= p->pc_count;
1998 p->pc_count = 0;
1999 if (p->count == 0)
2000 *pp = p->next;
2001 else
2002 pp = &p->next;
2003 }
2004 }
2005
2006 if (htab->is_vxworks)
2007 {
2008 struct elf_i386_dyn_relocs **pp;
2009 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2010 {
2011 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2012 *pp = p->next;
2013 else
2014 pp = &p->next;
2015 }
2016 }
2017
2018 /* Also discard relocs on undefined weak syms with non-default
2019 visibility. */
2020 if (eh->dyn_relocs != NULL
2021 && h->root.type == bfd_link_hash_undefweak)
2022 {
2023 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2024 eh->dyn_relocs = NULL;
2025
2026 /* Make sure undefined weak symbols are output as a dynamic
2027 symbol in PIEs. */
2028 else if (h->dynindx == -1
2029 && !h->forced_local)
2030 {
2031 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2032 return FALSE;
2033 }
2034 }
2035 }
2036 else if (ELIMINATE_COPY_RELOCS)
2037 {
2038 /* For the non-shared case, discard space for relocs against
2039 symbols which turn out to need copy relocs or are not
2040 dynamic. */
2041
2042 if (!h->non_got_ref
2043 && ((h->def_dynamic
2044 && !h->def_regular)
2045 || (htab->elf.dynamic_sections_created
2046 && (h->root.type == bfd_link_hash_undefweak
2047 || h->root.type == bfd_link_hash_undefined))))
2048 {
2049 /* Make sure this symbol is output as a dynamic symbol.
2050 Undefined weak syms won't yet be marked as dynamic. */
2051 if (h->dynindx == -1
2052 && !h->forced_local)
2053 {
2054 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2055 return FALSE;
2056 }
2057
2058 /* If that succeeded, we know we'll be keeping all the
2059 relocs. */
2060 if (h->dynindx != -1)
2061 goto keep;
2062 }
2063
2064 eh->dyn_relocs = NULL;
2065
2066 keep: ;
2067 }
2068
2069 /* Finally, allocate space. */
2070 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2071 {
2072 asection *sreloc;
2073
2074 sreloc = elf_section_data (p->sec)->sreloc;
2075
2076 BFD_ASSERT (sreloc != NULL);
2077 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2078 }
2079
2080 return TRUE;
2081 }
2082
2083 /* Find any dynamic relocs that apply to read-only sections. */
2084
2085 static bfd_boolean
2086 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2087 {
2088 struct elf_i386_link_hash_entry *eh;
2089 struct elf_i386_dyn_relocs *p;
2090
2091 if (h->root.type == bfd_link_hash_warning)
2092 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2093
2094 eh = (struct elf_i386_link_hash_entry *) h;
2095 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2096 {
2097 asection *s = p->sec->output_section;
2098
2099 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2100 {
2101 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2102
2103 info->flags |= DF_TEXTREL;
2104
2105 /* Not an error, just cut short the traversal. */
2106 return FALSE;
2107 }
2108 }
2109 return TRUE;
2110 }
2111
2112 /* Set the sizes of the dynamic sections. */
2113
2114 static bfd_boolean
2115 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2116 struct bfd_link_info *info)
2117 {
2118 struct elf_i386_link_hash_table *htab;
2119 bfd *dynobj;
2120 asection *s;
2121 bfd_boolean relocs;
2122 bfd *ibfd;
2123
2124 htab = elf_i386_hash_table (info);
2125 dynobj = htab->elf.dynobj;
2126 if (dynobj == NULL)
2127 abort ();
2128
2129 if (htab->elf.dynamic_sections_created)
2130 {
2131 /* Set the contents of the .interp section to the interpreter. */
2132 if (info->executable)
2133 {
2134 s = bfd_get_section_by_name (dynobj, ".interp");
2135 if (s == NULL)
2136 abort ();
2137 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2138 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2139 }
2140 }
2141
2142 /* Set up .got offsets for local syms, and space for local dynamic
2143 relocs. */
2144 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2145 {
2146 bfd_signed_vma *local_got;
2147 bfd_signed_vma *end_local_got;
2148 char *local_tls_type;
2149 bfd_vma *local_tlsdesc_gotent;
2150 bfd_size_type locsymcount;
2151 Elf_Internal_Shdr *symtab_hdr;
2152 asection *srel;
2153
2154 if (! is_i386_elf (ibfd))
2155 continue;
2156
2157 for (s = ibfd->sections; s != NULL; s = s->next)
2158 {
2159 struct elf_i386_dyn_relocs *p;
2160
2161 for (p = ((struct elf_i386_dyn_relocs *)
2162 elf_section_data (s)->local_dynrel);
2163 p != NULL;
2164 p = p->next)
2165 {
2166 if (!bfd_is_abs_section (p->sec)
2167 && bfd_is_abs_section (p->sec->output_section))
2168 {
2169 /* Input section has been discarded, either because
2170 it is a copy of a linkonce section or due to
2171 linker script /DISCARD/, so we'll be discarding
2172 the relocs too. */
2173 }
2174 else if (htab->is_vxworks
2175 && strcmp (p->sec->output_section->name,
2176 ".tls_vars") == 0)
2177 {
2178 /* Relocations in vxworks .tls_vars sections are
2179 handled specially by the loader. */
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_symtab_hdr (ibfd);
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, 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, info);
2369
2370 if ((info->flags & DF_TEXTREL) != 0)
2371 {
2372 if (!add_dynamic_entry (DT_TEXTREL, 0))
2373 return FALSE;
2374 }
2375 }
2376 if (htab->is_vxworks
2377 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2378 return FALSE;
2379 }
2380 #undef add_dynamic_entry
2381
2382 return TRUE;
2383 }
2384
2385 static bfd_boolean
2386 elf_i386_always_size_sections (bfd *output_bfd,
2387 struct bfd_link_info *info)
2388 {
2389 asection *tls_sec = elf_hash_table (info)->tls_sec;
2390
2391 if (tls_sec)
2392 {
2393 struct elf_link_hash_entry *tlsbase;
2394
2395 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2396 "_TLS_MODULE_BASE_",
2397 FALSE, FALSE, FALSE);
2398
2399 if (tlsbase && tlsbase->type == STT_TLS)
2400 {
2401 struct bfd_link_hash_entry *bh = NULL;
2402 const struct elf_backend_data *bed
2403 = get_elf_backend_data (output_bfd);
2404
2405 if (!(_bfd_generic_link_add_one_symbol
2406 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2407 tls_sec, 0, NULL, FALSE,
2408 bed->collect, &bh)))
2409 return FALSE;
2410
2411 elf_i386_hash_table (info)->tls_module_base = bh;
2412
2413 tlsbase = (struct elf_link_hash_entry *)bh;
2414 tlsbase->def_regular = 1;
2415 tlsbase->other = STV_HIDDEN;
2416 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2417 }
2418 }
2419
2420 return TRUE;
2421 }
2422
2423 /* Set the correct type for an x86 ELF section. We do this by the
2424 section name, which is a hack, but ought to work. */
2425
2426 static bfd_boolean
2427 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2428 Elf_Internal_Shdr *hdr,
2429 asection *sec)
2430 {
2431 register const char *name;
2432
2433 name = bfd_get_section_name (abfd, sec);
2434
2435 /* This is an ugly, but unfortunately necessary hack that is
2436 needed when producing EFI binaries on x86. It tells
2437 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2438 containing ELF relocation info. We need this hack in order to
2439 be able to generate ELF binaries that can be translated into
2440 EFI applications (which are essentially COFF objects). Those
2441 files contain a COFF ".reloc" section inside an ELFNN object,
2442 which would normally cause BFD to segfault because it would
2443 attempt to interpret this section as containing relocation
2444 entries for section "oc". With this hack enabled, ".reloc"
2445 will be treated as a normal data section, which will avoid the
2446 segfault. However, you won't be able to create an ELFNN binary
2447 with a section named "oc" that needs relocations, but that's
2448 the kind of ugly side-effects you get when detecting section
2449 types based on their names... In practice, this limitation is
2450 unlikely to bite. */
2451 if (strcmp (name, ".reloc") == 0)
2452 hdr->sh_type = SHT_PROGBITS;
2453
2454 return TRUE;
2455 }
2456
2457 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2458 executables. Rather than setting it to the beginning of the TLS
2459 section, we have to set it to the end. This function may be called
2460 multiple times, it is idempotent. */
2461
2462 static void
2463 set_tls_module_base (struct bfd_link_info *info)
2464 {
2465 struct bfd_link_hash_entry *base;
2466
2467 if (!info->executable)
2468 return;
2469
2470 base = elf_i386_hash_table (info)->tls_module_base;
2471
2472 if (!base)
2473 return;
2474
2475 base->u.def.value = elf_hash_table (info)->tls_size;
2476 }
2477
2478 /* Return the base VMA address which should be subtracted from real addresses
2479 when resolving @dtpoff relocation.
2480 This is PT_TLS segment p_vaddr. */
2481
2482 static bfd_vma
2483 dtpoff_base (struct bfd_link_info *info)
2484 {
2485 /* If tls_sec is NULL, we should have signalled an error already. */
2486 if (elf_hash_table (info)->tls_sec == NULL)
2487 return 0;
2488 return elf_hash_table (info)->tls_sec->vma;
2489 }
2490
2491 /* Return the relocation value for @tpoff relocation
2492 if STT_TLS virtual address is ADDRESS. */
2493
2494 static bfd_vma
2495 tpoff (struct bfd_link_info *info, bfd_vma address)
2496 {
2497 struct elf_link_hash_table *htab = elf_hash_table (info);
2498
2499 /* If tls_sec is NULL, we should have signalled an error already. */
2500 if (htab->tls_sec == NULL)
2501 return 0;
2502 return htab->tls_size + htab->tls_sec->vma - address;
2503 }
2504
2505 /* Relocate an i386 ELF section. */
2506
2507 static bfd_boolean
2508 elf_i386_relocate_section (bfd *output_bfd,
2509 struct bfd_link_info *info,
2510 bfd *input_bfd,
2511 asection *input_section,
2512 bfd_byte *contents,
2513 Elf_Internal_Rela *relocs,
2514 Elf_Internal_Sym *local_syms,
2515 asection **local_sections)
2516 {
2517 struct elf_i386_link_hash_table *htab;
2518 Elf_Internal_Shdr *symtab_hdr;
2519 struct elf_link_hash_entry **sym_hashes;
2520 bfd_vma *local_got_offsets;
2521 bfd_vma *local_tlsdesc_gotents;
2522 Elf_Internal_Rela *rel;
2523 Elf_Internal_Rela *relend;
2524 bfd_boolean is_vxworks_tls;
2525
2526 BFD_ASSERT (is_i386_elf (input_bfd));
2527
2528 htab = elf_i386_hash_table (info);
2529 symtab_hdr = &elf_symtab_hdr (input_bfd);
2530 sym_hashes = elf_sym_hashes (input_bfd);
2531 local_got_offsets = elf_local_got_offsets (input_bfd);
2532 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2533 /* We have to handle relocations in vxworks .tls_vars sections
2534 specially, because the dynamic loader is 'weird'. */
2535 is_vxworks_tls = (htab->is_vxworks && info->shared
2536 && !strcmp (input_section->output_section->name,
2537 ".tls_vars"));
2538
2539 set_tls_module_base (info);
2540
2541 rel = relocs;
2542 relend = relocs + input_section->reloc_count;
2543 for (; rel < relend; rel++)
2544 {
2545 unsigned int r_type;
2546 reloc_howto_type *howto;
2547 unsigned long r_symndx;
2548 struct elf_link_hash_entry *h;
2549 Elf_Internal_Sym *sym;
2550 asection *sec;
2551 bfd_vma off, offplt;
2552 bfd_vma relocation;
2553 bfd_boolean unresolved_reloc;
2554 bfd_reloc_status_type r;
2555 unsigned int indx;
2556 int tls_type;
2557
2558 r_type = ELF32_R_TYPE (rel->r_info);
2559 if (r_type == R_386_GNU_VTINHERIT
2560 || r_type == R_386_GNU_VTENTRY)
2561 continue;
2562
2563 if ((indx = r_type) >= R_386_standard
2564 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2565 >= R_386_ext - R_386_standard)
2566 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2567 >= R_386_tls - R_386_ext))
2568 {
2569 (*_bfd_error_handler)
2570 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2571 input_bfd, input_section, r_type);
2572 bfd_set_error (bfd_error_bad_value);
2573 return FALSE;
2574 }
2575 howto = elf_howto_table + indx;
2576
2577 r_symndx = ELF32_R_SYM (rel->r_info);
2578 h = NULL;
2579 sym = NULL;
2580 sec = NULL;
2581 unresolved_reloc = FALSE;
2582 if (r_symndx < symtab_hdr->sh_info)
2583 {
2584 sym = local_syms + r_symndx;
2585 sec = local_sections[r_symndx];
2586 relocation = (sec->output_section->vma
2587 + sec->output_offset
2588 + sym->st_value);
2589
2590 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2591 && ((sec->flags & SEC_MERGE) != 0
2592 || (info->relocatable
2593 && sec->output_offset != 0)))
2594 {
2595 bfd_vma addend;
2596 bfd_byte *where = contents + rel->r_offset;
2597
2598 switch (howto->size)
2599 {
2600 case 0:
2601 addend = bfd_get_8 (input_bfd, where);
2602 if (howto->pc_relative)
2603 {
2604 addend = (addend ^ 0x80) - 0x80;
2605 addend += 1;
2606 }
2607 break;
2608 case 1:
2609 addend = bfd_get_16 (input_bfd, where);
2610 if (howto->pc_relative)
2611 {
2612 addend = (addend ^ 0x8000) - 0x8000;
2613 addend += 2;
2614 }
2615 break;
2616 case 2:
2617 addend = bfd_get_32 (input_bfd, where);
2618 if (howto->pc_relative)
2619 {
2620 addend = (addend ^ 0x80000000) - 0x80000000;
2621 addend += 4;
2622 }
2623 break;
2624 default:
2625 abort ();
2626 }
2627
2628 if (info->relocatable)
2629 addend += sec->output_offset;
2630 else
2631 {
2632 asection *msec = sec;
2633 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2634 addend);
2635 addend -= relocation;
2636 addend += msec->output_section->vma + msec->output_offset;
2637 }
2638
2639 switch (howto->size)
2640 {
2641 case 0:
2642 /* FIXME: overflow checks. */
2643 if (howto->pc_relative)
2644 addend -= 1;
2645 bfd_put_8 (input_bfd, addend, where);
2646 break;
2647 case 1:
2648 if (howto->pc_relative)
2649 addend -= 2;
2650 bfd_put_16 (input_bfd, addend, where);
2651 break;
2652 case 2:
2653 if (howto->pc_relative)
2654 addend -= 4;
2655 bfd_put_32 (input_bfd, addend, where);
2656 break;
2657 }
2658 }
2659 }
2660 else
2661 {
2662 bfd_boolean warned;
2663
2664 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2665 r_symndx, symtab_hdr, sym_hashes,
2666 h, sec, relocation,
2667 unresolved_reloc, warned);
2668 }
2669
2670 if (sec != NULL && elf_discarded_section (sec))
2671 {
2672 /* For relocs against symbols from removed linkonce sections,
2673 or sections discarded by a linker script, we just want the
2674 section contents zeroed. Avoid any special processing. */
2675 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2676 rel->r_info = 0;
2677 rel->r_addend = 0;
2678 continue;
2679 }
2680
2681 if (info->relocatable)
2682 continue;
2683
2684 switch (r_type)
2685 {
2686 case R_386_GOT32:
2687 /* Relocation is to the entry for this symbol in the global
2688 offset table. */
2689 if (htab->sgot == NULL)
2690 abort ();
2691
2692 if (h != NULL)
2693 {
2694 bfd_boolean dyn;
2695
2696 off = h->got.offset;
2697 dyn = htab->elf.dynamic_sections_created;
2698 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2699 || (info->shared
2700 && SYMBOL_REFERENCES_LOCAL (info, h))
2701 || (ELF_ST_VISIBILITY (h->other)
2702 && h->root.type == bfd_link_hash_undefweak))
2703 {
2704 /* This is actually a static link, or it is a
2705 -Bsymbolic link and the symbol is defined
2706 locally, or the symbol was forced to be local
2707 because of a version file. We must initialize
2708 this entry in the global offset table. Since the
2709 offset must always be a multiple of 4, we use the
2710 least significant bit to record whether we have
2711 initialized it already.
2712
2713 When doing a dynamic link, we create a .rel.got
2714 relocation entry to initialize the value. This
2715 is done in the finish_dynamic_symbol routine. */
2716 if ((off & 1) != 0)
2717 off &= ~1;
2718 else
2719 {
2720 bfd_put_32 (output_bfd, relocation,
2721 htab->sgot->contents + off);
2722 h->got.offset |= 1;
2723 }
2724 }
2725 else
2726 unresolved_reloc = FALSE;
2727 }
2728 else
2729 {
2730 if (local_got_offsets == NULL)
2731 abort ();
2732
2733 off = local_got_offsets[r_symndx];
2734
2735 /* The offset must always be a multiple of 4. We use
2736 the least significant bit to record whether we have
2737 already generated the necessary reloc. */
2738 if ((off & 1) != 0)
2739 off &= ~1;
2740 else
2741 {
2742 bfd_put_32 (output_bfd, relocation,
2743 htab->sgot->contents + off);
2744
2745 if (info->shared)
2746 {
2747 asection *s;
2748 Elf_Internal_Rela outrel;
2749 bfd_byte *loc;
2750
2751 s = htab->srelgot;
2752 if (s == NULL)
2753 abort ();
2754
2755 outrel.r_offset = (htab->sgot->output_section->vma
2756 + htab->sgot->output_offset
2757 + off);
2758 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2759 loc = s->contents;
2760 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2761 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2762 }
2763
2764 local_got_offsets[r_symndx] |= 1;
2765 }
2766 }
2767
2768 if (off >= (bfd_vma) -2)
2769 abort ();
2770
2771 relocation = htab->sgot->output_section->vma
2772 + htab->sgot->output_offset + off
2773 - htab->sgotplt->output_section->vma
2774 - htab->sgotplt->output_offset;
2775 break;
2776
2777 case R_386_GOTOFF:
2778 /* Relocation is relative to the start of the global offset
2779 table. */
2780
2781 /* Check to make sure it isn't a protected function symbol
2782 for shared library since it may not be local when used
2783 as function address. We also need to make sure that a
2784 symbol is defined locally. */
2785 if (info->shared && h)
2786 {
2787 if (!h->def_regular)
2788 {
2789 const char *v;
2790
2791 switch (ELF_ST_VISIBILITY (h->other))
2792 {
2793 case STV_HIDDEN:
2794 v = _("hidden symbol");
2795 break;
2796 case STV_INTERNAL:
2797 v = _("internal symbol");
2798 break;
2799 case STV_PROTECTED:
2800 v = _("protected symbol");
2801 break;
2802 default:
2803 v = _("symbol");
2804 break;
2805 }
2806
2807 (*_bfd_error_handler)
2808 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
2809 input_bfd, v, h->root.root.string);
2810 bfd_set_error (bfd_error_bad_value);
2811 return FALSE;
2812 }
2813 else if (!info->executable
2814 && h->type == STT_FUNC
2815 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2816 {
2817 (*_bfd_error_handler)
2818 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2819 input_bfd, h->root.root.string);
2820 bfd_set_error (bfd_error_bad_value);
2821 return FALSE;
2822 }
2823 }
2824
2825 /* Note that sgot is not involved in this
2826 calculation. We always want the start of .got.plt. If we
2827 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2828 permitted by the ABI, we might have to change this
2829 calculation. */
2830 relocation -= htab->sgotplt->output_section->vma
2831 + htab->sgotplt->output_offset;
2832 break;
2833
2834 case R_386_GOTPC:
2835 /* Use global offset table as symbol value. */
2836 relocation = htab->sgotplt->output_section->vma
2837 + htab->sgotplt->output_offset;
2838 unresolved_reloc = FALSE;
2839 break;
2840
2841 case R_386_PLT32:
2842 /* Relocation is to the entry for this symbol in the
2843 procedure linkage table. */
2844
2845 /* Resolve a PLT32 reloc against a local symbol directly,
2846 without using the procedure linkage table. */
2847 if (h == NULL)
2848 break;
2849
2850 if (h->plt.offset == (bfd_vma) -1
2851 || htab->splt == NULL)
2852 {
2853 /* We didn't make a PLT entry for this symbol. This
2854 happens when statically linking PIC code, or when
2855 using -Bsymbolic. */
2856 break;
2857 }
2858
2859 relocation = (htab->splt->output_section->vma
2860 + htab->splt->output_offset
2861 + h->plt.offset);
2862 unresolved_reloc = FALSE;
2863 break;
2864
2865 case R_386_32:
2866 case R_386_PC32:
2867 if ((input_section->flags & SEC_ALLOC) == 0
2868 || is_vxworks_tls)
2869 break;
2870
2871 if ((info->shared
2872 && (h == NULL
2873 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2874 || h->root.type != bfd_link_hash_undefweak)
2875 && (r_type != R_386_PC32
2876 || !SYMBOL_CALLS_LOCAL (info, h)))
2877 || (ELIMINATE_COPY_RELOCS
2878 && !info->shared
2879 && h != NULL
2880 && h->dynindx != -1
2881 && !h->non_got_ref
2882 && ((h->def_dynamic
2883 && !h->def_regular)
2884 || h->root.type == bfd_link_hash_undefweak
2885 || h->root.type == bfd_link_hash_undefined)))
2886 {
2887 Elf_Internal_Rela outrel;
2888 bfd_byte *loc;
2889 bfd_boolean skip, relocate;
2890 asection *sreloc;
2891
2892 /* When generating a shared object, these relocations
2893 are copied into the output file to be resolved at run
2894 time. */
2895
2896 skip = FALSE;
2897 relocate = FALSE;
2898
2899 outrel.r_offset =
2900 _bfd_elf_section_offset (output_bfd, info, input_section,
2901 rel->r_offset);
2902 if (outrel.r_offset == (bfd_vma) -1)
2903 skip = TRUE;
2904 else if (outrel.r_offset == (bfd_vma) -2)
2905 skip = TRUE, relocate = TRUE;
2906 outrel.r_offset += (input_section->output_section->vma
2907 + input_section->output_offset);
2908
2909 if (skip)
2910 memset (&outrel, 0, sizeof outrel);
2911 else if (h != NULL
2912 && h->dynindx != -1
2913 && (r_type == R_386_PC32
2914 || !info->shared
2915 || !SYMBOLIC_BIND (info, h)
2916 || !h->def_regular))
2917 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2918 else
2919 {
2920 /* This symbol is local, or marked to become local. */
2921 relocate = TRUE;
2922 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2923 }
2924
2925 sreloc = elf_section_data (input_section)->sreloc;
2926
2927 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
2928
2929 loc = sreloc->contents;
2930 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2931
2932 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2933
2934 /* If this reloc is against an external symbol, we do
2935 not want to fiddle with the addend. Otherwise, we
2936 need to include the symbol value so that it becomes
2937 an addend for the dynamic reloc. */
2938 if (! relocate)
2939 continue;
2940 }
2941 break;
2942
2943 case R_386_TLS_IE:
2944 if (info->shared)
2945 {
2946 Elf_Internal_Rela outrel;
2947 bfd_byte *loc;
2948 asection *sreloc;
2949
2950 outrel.r_offset = rel->r_offset
2951 + input_section->output_section->vma
2952 + input_section->output_offset;
2953 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2954 sreloc = elf_section_data (input_section)->sreloc;
2955 if (sreloc == NULL)
2956 abort ();
2957 loc = sreloc->contents;
2958 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2959 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2960 }
2961 /* Fall through */
2962
2963 case R_386_TLS_GD:
2964 case R_386_TLS_GOTDESC:
2965 case R_386_TLS_DESC_CALL:
2966 case R_386_TLS_IE_32:
2967 case R_386_TLS_GOTIE:
2968 tls_type = GOT_UNKNOWN;
2969 if (h == NULL && local_got_offsets)
2970 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2971 else if (h != NULL)
2972 tls_type = elf_i386_hash_entry(h)->tls_type;
2973 if (tls_type == GOT_TLS_IE)
2974 tls_type = GOT_TLS_IE_NEG;
2975
2976 if (! elf_i386_tls_transition (info, input_bfd,
2977 input_section, contents,
2978 symtab_hdr, sym_hashes,
2979 &r_type, tls_type, rel,
2980 relend, h))
2981 return FALSE;
2982
2983 if (r_type == R_386_TLS_LE_32)
2984 {
2985 BFD_ASSERT (! unresolved_reloc);
2986 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2987 {
2988 unsigned int type;
2989 bfd_vma roff;
2990
2991 /* GD->LE transition. */
2992 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2993 if (type == 0x04)
2994 {
2995 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2996 Change it into:
2997 movl %gs:0, %eax; subl $foo@tpoff, %eax
2998 (6 byte form of subl). */
2999 memcpy (contents + rel->r_offset - 3,
3000 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3001 roff = rel->r_offset + 5;
3002 }
3003 else
3004 {
3005 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3006 Change it into:
3007 movl %gs:0, %eax; subl $foo@tpoff, %eax
3008 (6 byte form of subl). */
3009 memcpy (contents + rel->r_offset - 2,
3010 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3011 roff = rel->r_offset + 6;
3012 }
3013 bfd_put_32 (output_bfd, tpoff (info, relocation),
3014 contents + roff);
3015 /* Skip R_386_PC32/R_386_PLT32. */
3016 rel++;
3017 continue;
3018 }
3019 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3020 {
3021 /* GDesc -> LE transition.
3022 It's originally something like:
3023 leal x@tlsdesc(%ebx), %eax
3024
3025 leal x@ntpoff, %eax
3026
3027 Registers other than %eax may be set up here. */
3028
3029 unsigned int val;
3030 bfd_vma roff;
3031
3032 roff = rel->r_offset;
3033 val = bfd_get_8 (input_bfd, contents + roff - 1);
3034
3035 /* Now modify the instruction as appropriate. */
3036 /* aoliva FIXME: remove the above and xor the byte
3037 below with 0x86. */
3038 bfd_put_8 (output_bfd, val ^ 0x86,
3039 contents + roff - 1);
3040 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3041 contents + roff);
3042 continue;
3043 }
3044 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3045 {
3046 /* GDesc -> LE transition.
3047 It's originally:
3048 call *(%eax)
3049 Turn it into:
3050 xchg %ax,%ax */
3051
3052 bfd_vma roff;
3053
3054 roff = rel->r_offset;
3055 bfd_put_8 (output_bfd, 0x66, contents + roff);
3056 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3057 continue;
3058 }
3059 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3060 {
3061 unsigned int val;
3062
3063 /* IE->LE transition:
3064 Originally it can be one of:
3065 movl foo, %eax
3066 movl foo, %reg
3067 addl foo, %reg
3068 We change it into:
3069 movl $foo, %eax
3070 movl $foo, %reg
3071 addl $foo, %reg. */
3072 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3073 if (val == 0xa1)
3074 {
3075 /* movl foo, %eax. */
3076 bfd_put_8 (output_bfd, 0xb8,
3077 contents + rel->r_offset - 1);
3078 }
3079 else
3080 {
3081 unsigned int type;
3082
3083 type = bfd_get_8 (input_bfd,
3084 contents + rel->r_offset - 2);
3085 switch (type)
3086 {
3087 case 0x8b:
3088 /* movl */
3089 bfd_put_8 (output_bfd, 0xc7,
3090 contents + rel->r_offset - 2);
3091 bfd_put_8 (output_bfd,
3092 0xc0 | ((val >> 3) & 7),
3093 contents + rel->r_offset - 1);
3094 break;
3095 case 0x03:
3096 /* addl */
3097 bfd_put_8 (output_bfd, 0x81,
3098 contents + rel->r_offset - 2);
3099 bfd_put_8 (output_bfd,
3100 0xc0 | ((val >> 3) & 7),
3101 contents + rel->r_offset - 1);
3102 break;
3103 default:
3104 BFD_FAIL ();
3105 break;
3106 }
3107 }
3108 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3109 contents + rel->r_offset);
3110 continue;
3111 }
3112 else
3113 {
3114 unsigned int val, type;
3115
3116 /* {IE_32,GOTIE}->LE transition:
3117 Originally it can be one of:
3118 subl foo(%reg1), %reg2
3119 movl foo(%reg1), %reg2
3120 addl foo(%reg1), %reg2
3121 We change it into:
3122 subl $foo, %reg2
3123 movl $foo, %reg2 (6 byte form)
3124 addl $foo, %reg2. */
3125 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3126 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3127 if (type == 0x8b)
3128 {
3129 /* movl */
3130 bfd_put_8 (output_bfd, 0xc7,
3131 contents + rel->r_offset - 2);
3132 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3133 contents + rel->r_offset - 1);
3134 }
3135 else if (type == 0x2b)
3136 {
3137 /* subl */
3138 bfd_put_8 (output_bfd, 0x81,
3139 contents + rel->r_offset - 2);
3140 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3141 contents + rel->r_offset - 1);
3142 }
3143 else if (type == 0x03)
3144 {
3145 /* addl */
3146 bfd_put_8 (output_bfd, 0x81,
3147 contents + rel->r_offset - 2);
3148 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3149 contents + rel->r_offset - 1);
3150 }
3151 else
3152 BFD_FAIL ();
3153 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3154 bfd_put_32 (output_bfd, -tpoff (info, relocation),
3155 contents + rel->r_offset);
3156 else
3157 bfd_put_32 (output_bfd, tpoff (info, relocation),
3158 contents + rel->r_offset);
3159 continue;
3160 }
3161 }
3162
3163 if (htab->sgot == NULL)
3164 abort ();
3165
3166 if (h != NULL)
3167 {
3168 off = h->got.offset;
3169 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3170 }
3171 else
3172 {
3173 if (local_got_offsets == NULL)
3174 abort ();
3175
3176 off = local_got_offsets[r_symndx];
3177 offplt = local_tlsdesc_gotents[r_symndx];
3178 }
3179
3180 if ((off & 1) != 0)
3181 off &= ~1;
3182 else
3183 {
3184 Elf_Internal_Rela outrel;
3185 bfd_byte *loc;
3186 int dr_type, indx;
3187 asection *sreloc;
3188
3189 if (htab->srelgot == NULL)
3190 abort ();
3191
3192 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3193
3194 if (GOT_TLS_GDESC_P (tls_type))
3195 {
3196 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3197 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3198 <= htab->sgotplt->size);
3199 outrel.r_offset = (htab->sgotplt->output_section->vma
3200 + htab->sgotplt->output_offset
3201 + offplt
3202 + htab->sgotplt_jump_table_size);
3203 sreloc = htab->srelplt;
3204 loc = sreloc->contents;
3205 loc += (htab->next_tls_desc_index++
3206 * sizeof (Elf32_External_Rel));
3207 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3208 <= sreloc->contents + sreloc->size);
3209 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3210 if (indx == 0)
3211 {
3212 BFD_ASSERT (! unresolved_reloc);
3213 bfd_put_32 (output_bfd,
3214 relocation - dtpoff_base (info),
3215 htab->sgotplt->contents + offplt
3216 + htab->sgotplt_jump_table_size + 4);
3217 }
3218 else
3219 {
3220 bfd_put_32 (output_bfd, 0,
3221 htab->sgotplt->contents + offplt
3222 + htab->sgotplt_jump_table_size + 4);
3223 }
3224 }
3225
3226 sreloc = htab->srelgot;
3227
3228 outrel.r_offset = (htab->sgot->output_section->vma
3229 + htab->sgot->output_offset + off);
3230
3231 if (GOT_TLS_GD_P (tls_type))
3232 dr_type = R_386_TLS_DTPMOD32;
3233 else if (GOT_TLS_GDESC_P (tls_type))
3234 goto dr_done;
3235 else if (tls_type == GOT_TLS_IE_POS)
3236 dr_type = R_386_TLS_TPOFF;
3237 else
3238 dr_type = R_386_TLS_TPOFF32;
3239
3240 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3241 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
3242 htab->sgot->contents + off);
3243 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3244 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
3245 htab->sgot->contents + off);
3246 else if (dr_type != R_386_TLS_DESC)
3247 bfd_put_32 (output_bfd, 0,
3248 htab->sgot->contents + off);
3249 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3250
3251 loc = sreloc->contents;
3252 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3253 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3254 <= sreloc->contents + sreloc->size);
3255 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3256
3257 if (GOT_TLS_GD_P (tls_type))
3258 {
3259 if (indx == 0)
3260 {
3261 BFD_ASSERT (! unresolved_reloc);
3262 bfd_put_32 (output_bfd,
3263 relocation - dtpoff_base (info),
3264 htab->sgot->contents + off + 4);
3265 }
3266 else
3267 {
3268 bfd_put_32 (output_bfd, 0,
3269 htab->sgot->contents + off + 4);
3270 outrel.r_info = ELF32_R_INFO (indx,
3271 R_386_TLS_DTPOFF32);
3272 outrel.r_offset += 4;
3273 sreloc->reloc_count++;
3274 loc += sizeof (Elf32_External_Rel);
3275 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3276 <= sreloc->contents + sreloc->size);
3277 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3278 }
3279 }
3280 else if (tls_type == GOT_TLS_IE_BOTH)
3281 {
3282 bfd_put_32 (output_bfd,
3283 indx == 0 ? relocation - dtpoff_base (info) : 0,
3284 htab->sgot->contents + off + 4);
3285 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3286 outrel.r_offset += 4;
3287 sreloc->reloc_count++;
3288 loc += sizeof (Elf32_External_Rel);
3289 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3290 }
3291
3292 dr_done:
3293 if (h != NULL)
3294 h->got.offset |= 1;
3295 else
3296 local_got_offsets[r_symndx] |= 1;
3297 }
3298
3299 if (off >= (bfd_vma) -2
3300 && ! GOT_TLS_GDESC_P (tls_type))
3301 abort ();
3302 if (r_type == R_386_TLS_GOTDESC
3303 || r_type == R_386_TLS_DESC_CALL)
3304 {
3305 relocation = htab->sgotplt_jump_table_size + offplt;
3306 unresolved_reloc = FALSE;
3307 }
3308 else if (r_type == ELF32_R_TYPE (rel->r_info))
3309 {
3310 bfd_vma g_o_t = htab->sgotplt->output_section->vma
3311 + htab->sgotplt->output_offset;
3312 relocation = htab->sgot->output_section->vma
3313 + htab->sgot->output_offset + off - g_o_t;
3314 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3315 && tls_type == GOT_TLS_IE_BOTH)
3316 relocation += 4;
3317 if (r_type == R_386_TLS_IE)
3318 relocation += g_o_t;
3319 unresolved_reloc = FALSE;
3320 }
3321 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3322 {
3323 unsigned int val, type;
3324 bfd_vma roff;
3325
3326 /* GD->IE transition. */
3327 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3328 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3329 if (type == 0x04)
3330 {
3331 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3332 Change it into:
3333 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3334 val >>= 3;
3335 roff = rel->r_offset - 3;
3336 }
3337 else
3338 {
3339 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3340 Change it into:
3341 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3342 roff = rel->r_offset - 2;
3343 }
3344 memcpy (contents + roff,
3345 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3346 contents[roff + 7] = 0x80 | (val & 7);
3347 /* If foo is used only with foo@gotntpoff(%reg) and
3348 foo@indntpoff, but not with foo@gottpoff(%reg), change
3349 subl $foo@gottpoff(%reg), %eax
3350 into:
3351 addl $foo@gotntpoff(%reg), %eax. */
3352 if (tls_type == GOT_TLS_IE_POS)
3353 contents[roff + 6] = 0x03;
3354 bfd_put_32 (output_bfd,
3355 htab->sgot->output_section->vma
3356 + htab->sgot->output_offset + off
3357 - htab->sgotplt->output_section->vma
3358 - htab->sgotplt->output_offset,
3359 contents + roff + 8);
3360 /* Skip R_386_PLT32. */
3361 rel++;
3362 continue;
3363 }
3364 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3365 {
3366 /* GDesc -> IE transition.
3367 It's originally something like:
3368 leal x@tlsdesc(%ebx), %eax
3369
3370 Change it to:
3371 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3372 or:
3373 movl x@gottpoff(%ebx), %eax # before negl %eax
3374
3375 Registers other than %eax may be set up here. */
3376
3377 bfd_vma roff;
3378
3379 /* First, make sure it's a leal adding ebx to a 32-bit
3380 offset into any register, although it's probably
3381 almost always going to be eax. */
3382 roff = rel->r_offset;
3383
3384 /* Now modify the instruction as appropriate. */
3385 /* To turn a leal into a movl in the form we use it, it
3386 suffices to change the first byte from 0x8d to 0x8b.
3387 aoliva FIXME: should we decide to keep the leal, all
3388 we have to do is remove the statement below, and
3389 adjust the relaxation of R_386_TLS_DESC_CALL. */
3390 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3391
3392 if (tls_type == GOT_TLS_IE_BOTH)
3393 off += 4;
3394
3395 bfd_put_32 (output_bfd,
3396 htab->sgot->output_section->vma
3397 + htab->sgot->output_offset + off
3398 - htab->sgotplt->output_section->vma
3399 - htab->sgotplt->output_offset,
3400 contents + roff);
3401 continue;
3402 }
3403 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3404 {
3405 /* GDesc -> IE transition.
3406 It's originally:
3407 call *(%eax)
3408
3409 Change it to:
3410 xchg %ax,%ax
3411 or
3412 negl %eax
3413 depending on how we transformed the TLS_GOTDESC above.
3414 */
3415
3416 bfd_vma roff;
3417
3418 roff = rel->r_offset;
3419
3420 /* Now modify the instruction as appropriate. */
3421 if (tls_type != GOT_TLS_IE_NEG)
3422 {
3423 /* xchg %ax,%ax */
3424 bfd_put_8 (output_bfd, 0x66, contents + roff);
3425 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3426 }
3427 else
3428 {
3429 /* negl %eax */
3430 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3431 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3432 }
3433
3434 continue;
3435 }
3436 else
3437 BFD_ASSERT (FALSE);
3438 break;
3439
3440 case R_386_TLS_LDM:
3441 if (! elf_i386_tls_transition (info, input_bfd,
3442 input_section, contents,
3443 symtab_hdr, sym_hashes,
3444 &r_type, GOT_UNKNOWN, rel,
3445 relend, h))
3446 return FALSE;
3447
3448 if (r_type != R_386_TLS_LDM)
3449 {
3450 /* LD->LE transition:
3451 leal foo(%reg), %eax; call ___tls_get_addr.
3452 We change it into:
3453 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3454 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3455 memcpy (contents + rel->r_offset - 2,
3456 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3457 /* Skip R_386_PC32/R_386_PLT32. */
3458 rel++;
3459 continue;
3460 }
3461
3462 if (htab->sgot == NULL)
3463 abort ();
3464
3465 off = htab->tls_ldm_got.offset;
3466 if (off & 1)
3467 off &= ~1;
3468 else
3469 {
3470 Elf_Internal_Rela outrel;
3471 bfd_byte *loc;
3472
3473 if (htab->srelgot == NULL)
3474 abort ();
3475
3476 outrel.r_offset = (htab->sgot->output_section->vma
3477 + htab->sgot->output_offset + off);
3478
3479 bfd_put_32 (output_bfd, 0,
3480 htab->sgot->contents + off);
3481 bfd_put_32 (output_bfd, 0,
3482 htab->sgot->contents + off + 4);
3483 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3484 loc = htab->srelgot->contents;
3485 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3486 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3487 htab->tls_ldm_got.offset |= 1;
3488 }
3489 relocation = htab->sgot->output_section->vma
3490 + htab->sgot->output_offset + off
3491 - htab->sgotplt->output_section->vma
3492 - htab->sgotplt->output_offset;
3493 unresolved_reloc = FALSE;
3494 break;
3495
3496 case R_386_TLS_LDO_32:
3497 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3498 relocation -= dtpoff_base (info);
3499 else
3500 /* When converting LDO to LE, we must negate. */
3501 relocation = -tpoff (info, relocation);
3502 break;
3503
3504 case R_386_TLS_LE_32:
3505 case R_386_TLS_LE:
3506 if (info->shared)
3507 {
3508 Elf_Internal_Rela outrel;
3509 asection *sreloc;
3510 bfd_byte *loc;
3511 int indx;
3512
3513 outrel.r_offset = rel->r_offset
3514 + input_section->output_section->vma
3515 + input_section->output_offset;
3516 if (h != NULL && h->dynindx != -1)
3517 indx = h->dynindx;
3518 else
3519 indx = 0;
3520 if (r_type == R_386_TLS_LE_32)
3521 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3522 else
3523 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3524 sreloc = elf_section_data (input_section)->sreloc;
3525 if (sreloc == NULL)
3526 abort ();
3527 loc = sreloc->contents;
3528 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3529 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3530 if (indx)
3531 continue;
3532 else if (r_type == R_386_TLS_LE_32)
3533 relocation = dtpoff_base (info) - relocation;
3534 else
3535 relocation -= dtpoff_base (info);
3536 }
3537 else if (r_type == R_386_TLS_LE_32)
3538 relocation = tpoff (info, relocation);
3539 else
3540 relocation = -tpoff (info, relocation);
3541 break;
3542
3543 default:
3544 break;
3545 }
3546
3547 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3548 because such sections are not SEC_ALLOC and thus ld.so will
3549 not process them. */
3550 if (unresolved_reloc
3551 && !((input_section->flags & SEC_DEBUGGING) != 0
3552 && h->def_dynamic))
3553 {
3554 (*_bfd_error_handler)
3555 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3556 input_bfd,
3557 input_section,
3558 (long) rel->r_offset,
3559 howto->name,
3560 h->root.root.string);
3561 return FALSE;
3562 }
3563
3564 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3565 contents, rel->r_offset,
3566 relocation, 0);
3567
3568 if (r != bfd_reloc_ok)
3569 {
3570 const char *name;
3571
3572 if (h != NULL)
3573 name = h->root.root.string;
3574 else
3575 {
3576 name = bfd_elf_string_from_elf_section (input_bfd,
3577 symtab_hdr->sh_link,
3578 sym->st_name);
3579 if (name == NULL)
3580 return FALSE;
3581 if (*name == '\0')
3582 name = bfd_section_name (input_bfd, sec);
3583 }
3584
3585 if (r == bfd_reloc_overflow)
3586 {
3587 if (! ((*info->callbacks->reloc_overflow)
3588 (info, (h ? &h->root : NULL), name, howto->name,
3589 (bfd_vma) 0, input_bfd, input_section,
3590 rel->r_offset)))
3591 return FALSE;
3592 }
3593 else
3594 {
3595 (*_bfd_error_handler)
3596 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3597 input_bfd, input_section,
3598 (long) rel->r_offset, name, (int) r);
3599 return FALSE;
3600 }
3601 }
3602 }
3603
3604 return TRUE;
3605 }
3606
3607 /* Finish up dynamic symbol handling. We set the contents of various
3608 dynamic sections here. */
3609
3610 static bfd_boolean
3611 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3612 struct bfd_link_info *info,
3613 struct elf_link_hash_entry *h,
3614 Elf_Internal_Sym *sym)
3615 {
3616 struct elf_i386_link_hash_table *htab;
3617
3618 htab = elf_i386_hash_table (info);
3619
3620 if (h->plt.offset != (bfd_vma) -1)
3621 {
3622 bfd_vma plt_index;
3623 bfd_vma got_offset;
3624 Elf_Internal_Rela rel;
3625 bfd_byte *loc;
3626
3627 /* This symbol has an entry in the procedure linkage table. Set
3628 it up. */
3629
3630 if (h->dynindx == -1
3631 || htab->splt == NULL
3632 || htab->sgotplt == NULL
3633 || htab->srelplt == NULL)
3634 abort ();
3635
3636 /* Get the index in the procedure linkage table which
3637 corresponds to this symbol. This is the index of this symbol
3638 in all the symbols for which we are making plt entries. The
3639 first entry in the procedure linkage table is reserved. */
3640 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3641
3642 /* Get the offset into the .got table of the entry that
3643 corresponds to this function. Each .got entry is 4 bytes.
3644 The first three are reserved. */
3645 got_offset = (plt_index + 3) * 4;
3646
3647 /* Fill in the entry in the procedure linkage table. */
3648 if (! info->shared)
3649 {
3650 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3651 PLT_ENTRY_SIZE);
3652 bfd_put_32 (output_bfd,
3653 (htab->sgotplt->output_section->vma
3654 + htab->sgotplt->output_offset
3655 + got_offset),
3656 htab->splt->contents + h->plt.offset + 2);
3657
3658 if (htab->is_vxworks)
3659 {
3660 int s, k, reloc_index;
3661
3662 /* Create the R_386_32 relocation referencing the GOT
3663 for this PLT entry. */
3664
3665 /* S: Current slot number (zero-based). */
3666 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3667 /* K: Number of relocations for PLTResolve. */
3668 if (info->shared)
3669 k = PLTRESOLVE_RELOCS_SHLIB;
3670 else
3671 k = PLTRESOLVE_RELOCS;
3672 /* Skip the PLTresolve relocations, and the relocations for
3673 the other PLT slots. */
3674 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3675 loc = (htab->srelplt2->contents + reloc_index
3676 * sizeof (Elf32_External_Rel));
3677
3678 rel.r_offset = (htab->splt->output_section->vma
3679 + htab->splt->output_offset
3680 + h->plt.offset + 2),
3681 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3682 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3683
3684 /* Create the R_386_32 relocation referencing the beginning of
3685 the PLT for this GOT entry. */
3686 rel.r_offset = (htab->sgotplt->output_section->vma
3687 + htab->sgotplt->output_offset
3688 + got_offset);
3689 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3690 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3691 loc + sizeof (Elf32_External_Rel));
3692 }
3693 }
3694 else
3695 {
3696 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3697 PLT_ENTRY_SIZE);
3698 bfd_put_32 (output_bfd, got_offset,
3699 htab->splt->contents + h->plt.offset + 2);
3700 }
3701
3702 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3703 htab->splt->contents + h->plt.offset + 7);
3704 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3705 htab->splt->contents + h->plt.offset + 12);
3706
3707 /* Fill in the entry in the global offset table. */
3708 bfd_put_32 (output_bfd,
3709 (htab->splt->output_section->vma
3710 + htab->splt->output_offset
3711 + h->plt.offset
3712 + 6),
3713 htab->sgotplt->contents + got_offset);
3714
3715 /* Fill in the entry in the .rel.plt section. */
3716 rel.r_offset = (htab->sgotplt->output_section->vma
3717 + htab->sgotplt->output_offset
3718 + got_offset);
3719 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3720 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3721 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3722
3723 if (!h->def_regular)
3724 {
3725 /* Mark the symbol as undefined, rather than as defined in
3726 the .plt section. Leave the value if there were any
3727 relocations where pointer equality matters (this is a clue
3728 for the dynamic linker, to make function pointer
3729 comparisons work between an application and shared
3730 library), otherwise set it to zero. If a function is only
3731 called from a binary, there is no need to slow down
3732 shared libraries because of that. */
3733 sym->st_shndx = SHN_UNDEF;
3734 if (!h->pointer_equality_needed)
3735 sym->st_value = 0;
3736 }
3737 }
3738
3739 if (h->got.offset != (bfd_vma) -1
3740 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
3741 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3742 {
3743 Elf_Internal_Rela rel;
3744 bfd_byte *loc;
3745
3746 /* This symbol has an entry in the global offset table. Set it
3747 up. */
3748
3749 if (htab->sgot == NULL || htab->srelgot == NULL)
3750 abort ();
3751
3752 rel.r_offset = (htab->sgot->output_section->vma
3753 + htab->sgot->output_offset
3754 + (h->got.offset & ~(bfd_vma) 1));
3755
3756 /* If this is a static link, or it is a -Bsymbolic link and the
3757 symbol is defined locally or was forced to be local because
3758 of a version file, we just want to emit a RELATIVE reloc.
3759 The entry in the global offset table will already have been
3760 initialized in the relocate_section function. */
3761 if (info->shared
3762 && SYMBOL_REFERENCES_LOCAL (info, h))
3763 {
3764 BFD_ASSERT((h->got.offset & 1) != 0);
3765 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3766 }
3767 else
3768 {
3769 BFD_ASSERT((h->got.offset & 1) == 0);
3770 bfd_put_32 (output_bfd, (bfd_vma) 0,
3771 htab->sgot->contents + h->got.offset);
3772 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3773 }
3774
3775 loc = htab->srelgot->contents;
3776 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3777 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3778 }
3779
3780 if (h->needs_copy)
3781 {
3782 Elf_Internal_Rela rel;
3783 bfd_byte *loc;
3784
3785 /* This symbol needs a copy reloc. Set it up. */
3786
3787 if (h->dynindx == -1
3788 || (h->root.type != bfd_link_hash_defined
3789 && h->root.type != bfd_link_hash_defweak)
3790 || htab->srelbss == NULL)
3791 abort ();
3792
3793 rel.r_offset = (h->root.u.def.value
3794 + h->root.u.def.section->output_section->vma
3795 + h->root.u.def.section->output_offset);
3796 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3797 loc = htab->srelbss->contents;
3798 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3799 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3800 }
3801
3802 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3803 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3804 is relative to the ".got" section. */
3805 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3806 || (!htab->is_vxworks && h == htab->elf.hgot))
3807 sym->st_shndx = SHN_ABS;
3808
3809 return TRUE;
3810 }
3811
3812 /* Used to decide how to sort relocs in an optimal manner for the
3813 dynamic linker, before writing them out. */
3814
3815 static enum elf_reloc_type_class
3816 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3817 {
3818 switch (ELF32_R_TYPE (rela->r_info))
3819 {
3820 case R_386_RELATIVE:
3821 return reloc_class_relative;
3822 case R_386_JUMP_SLOT:
3823 return reloc_class_plt;
3824 case R_386_COPY:
3825 return reloc_class_copy;
3826 default:
3827 return reloc_class_normal;
3828 }
3829 }
3830
3831 /* Finish up the dynamic sections. */
3832
3833 static bfd_boolean
3834 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3835 struct bfd_link_info *info)
3836 {
3837 struct elf_i386_link_hash_table *htab;
3838 bfd *dynobj;
3839 asection *sdyn;
3840
3841 htab = elf_i386_hash_table (info);
3842 dynobj = htab->elf.dynobj;
3843 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3844
3845 if (htab->elf.dynamic_sections_created)
3846 {
3847 Elf32_External_Dyn *dyncon, *dynconend;
3848
3849 if (sdyn == NULL || htab->sgot == NULL)
3850 abort ();
3851
3852 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3853 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3854 for (; dyncon < dynconend; dyncon++)
3855 {
3856 Elf_Internal_Dyn dyn;
3857 asection *s;
3858
3859 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3860
3861 switch (dyn.d_tag)
3862 {
3863 default:
3864 if (htab->is_vxworks
3865 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
3866 break;
3867 continue;
3868
3869 case DT_PLTGOT:
3870 s = htab->sgotplt;
3871 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3872 break;
3873
3874 case DT_JMPREL:
3875 s = htab->srelplt;
3876 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3877 break;
3878
3879 case DT_PLTRELSZ:
3880 s = htab->srelplt;
3881 dyn.d_un.d_val = s->size;
3882 break;
3883
3884 case DT_RELSZ:
3885 /* My reading of the SVR4 ABI indicates that the
3886 procedure linkage table relocs (DT_JMPREL) should be
3887 included in the overall relocs (DT_REL). This is
3888 what Solaris does. However, UnixWare can not handle
3889 that case. Therefore, we override the DT_RELSZ entry
3890 here to make it not include the JMPREL relocs. */
3891 s = htab->srelplt;
3892 if (s == NULL)
3893 continue;
3894 dyn.d_un.d_val -= s->size;
3895 break;
3896
3897 case DT_REL:
3898 /* We may not be using the standard ELF linker script.
3899 If .rel.plt is the first .rel section, we adjust
3900 DT_REL to not include it. */
3901 s = htab->srelplt;
3902 if (s == NULL)
3903 continue;
3904 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3905 continue;
3906 dyn.d_un.d_ptr += s->size;
3907 break;
3908 }
3909
3910 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3911 }
3912
3913 /* Fill in the first entry in the procedure linkage table. */
3914 if (htab->splt && htab->splt->size > 0)
3915 {
3916 if (info->shared)
3917 {
3918 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3919 sizeof (elf_i386_pic_plt0_entry));
3920 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3921 htab->plt0_pad_byte,
3922 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3923 }
3924 else
3925 {
3926 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3927 sizeof(elf_i386_plt0_entry));
3928 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3929 htab->plt0_pad_byte,
3930 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3931 bfd_put_32 (output_bfd,
3932 (htab->sgotplt->output_section->vma
3933 + htab->sgotplt->output_offset
3934 + 4),
3935 htab->splt->contents + 2);
3936 bfd_put_32 (output_bfd,
3937 (htab->sgotplt->output_section->vma
3938 + htab->sgotplt->output_offset
3939 + 8),
3940 htab->splt->contents + 8);
3941
3942 if (htab->is_vxworks)
3943 {
3944 Elf_Internal_Rela rel;
3945
3946 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3947 On IA32 we use REL relocations so the addend goes in
3948 the PLT directly. */
3949 rel.r_offset = (htab->splt->output_section->vma
3950 + htab->splt->output_offset
3951 + 2);
3952 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3953 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3954 htab->srelplt2->contents);
3955 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3956 rel.r_offset = (htab->splt->output_section->vma
3957 + htab->splt->output_offset
3958 + 8);
3959 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3960 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3961 htab->srelplt2->contents +
3962 sizeof (Elf32_External_Rel));
3963 }
3964 }
3965
3966 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3967 really seem like the right value. */
3968 elf_section_data (htab->splt->output_section)
3969 ->this_hdr.sh_entsize = 4;
3970
3971 /* Correct the .rel.plt.unloaded relocations. */
3972 if (htab->is_vxworks && !info->shared)
3973 {
3974 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3975 unsigned char *p;
3976
3977 p = htab->srelplt2->contents;
3978 if (info->shared)
3979 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3980 else
3981 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3982
3983 for (; num_plts; num_plts--)
3984 {
3985 Elf_Internal_Rela rel;
3986 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3987 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3988 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3989 p += sizeof (Elf32_External_Rel);
3990
3991 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3992 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3993 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3994 p += sizeof (Elf32_External_Rel);
3995 }
3996 }
3997 }
3998 }
3999
4000 if (htab->sgotplt)
4001 {
4002 /* Fill in the first three entries in the global offset table. */
4003 if (htab->sgotplt->size > 0)
4004 {
4005 bfd_put_32 (output_bfd,
4006 (sdyn == NULL ? 0
4007 : sdyn->output_section->vma + sdyn->output_offset),
4008 htab->sgotplt->contents);
4009 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
4010 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
4011 }
4012
4013 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
4014 }
4015
4016 if (htab->sgot && htab->sgot->size > 0)
4017 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
4018
4019 return TRUE;
4020 }
4021
4022 /* Return address for Ith PLT stub in section PLT, for relocation REL
4023 or (bfd_vma) -1 if it should not be included. */
4024
4025 static bfd_vma
4026 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4027 const arelent *rel ATTRIBUTE_UNUSED)
4028 {
4029 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4030 }
4031
4032 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4033
4034 static bfd_boolean
4035 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4036 {
4037 if (h->plt.offset != (bfd_vma) -1
4038 && !h->def_regular
4039 && !h->pointer_equality_needed)
4040 return FALSE;
4041
4042 return _bfd_elf_hash_symbol (h);
4043 }
4044
4045 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4046 #define TARGET_LITTLE_NAME "elf32-i386"
4047 #define ELF_ARCH bfd_arch_i386
4048 #define ELF_MACHINE_CODE EM_386
4049 #define ELF_MAXPAGESIZE 0x1000
4050
4051 #define elf_backend_can_gc_sections 1
4052 #define elf_backend_can_refcount 1
4053 #define elf_backend_want_got_plt 1
4054 #define elf_backend_plt_readonly 1
4055 #define elf_backend_want_plt_sym 0
4056 #define elf_backend_got_header_size 12
4057
4058 /* Support RELA for objdump of prelink objects. */
4059 #define elf_info_to_howto elf_i386_info_to_howto_rel
4060 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4061
4062 #define bfd_elf32_mkobject elf_i386_mkobject
4063
4064 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4065 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4066 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4067 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4068
4069 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4070 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4071 #define elf_backend_check_relocs elf_i386_check_relocs
4072 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4073 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4074 #define elf_backend_fake_sections elf_i386_fake_sections
4075 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4076 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4077 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4078 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4079 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4080 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4081 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4082 #define elf_backend_relocate_section elf_i386_relocate_section
4083 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4084 #define elf_backend_always_size_sections elf_i386_always_size_sections
4085 #define elf_backend_omit_section_dynsym \
4086 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4087 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4088 #define elf_backend_hash_symbol elf_i386_hash_symbol
4089
4090 #include "elf32-target.h"
4091
4092 /* FreeBSD support. */
4093
4094 #undef TARGET_LITTLE_SYM
4095 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4096 #undef TARGET_LITTLE_NAME
4097 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4098 #undef ELF_OSABI
4099 #define ELF_OSABI ELFOSABI_FREEBSD
4100
4101 /* The kernel recognizes executables as valid only if they carry a
4102 "FreeBSD" label in the ELF header. So we put this label on all
4103 executables and (for simplicity) also all other object files. */
4104
4105 static void
4106 elf_i386_post_process_headers (bfd *abfd,
4107 struct bfd_link_info *info ATTRIBUTE_UNUSED)
4108 {
4109 Elf_Internal_Ehdr *i_ehdrp;
4110
4111 i_ehdrp = elf_elfheader (abfd);
4112
4113 /* Put an ABI label supported by FreeBSD >= 4.1. */
4114 i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi;
4115 #ifdef OLD_FREEBSD_ABI_LABEL
4116 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4117 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4118 #endif
4119 }
4120
4121 #undef elf_backend_post_process_headers
4122 #define elf_backend_post_process_headers elf_i386_post_process_headers
4123 #undef elf32_bed
4124 #define elf32_bed elf32_i386_fbsd_bed
4125
4126 #include "elf32-target.h"
4127
4128 /* VxWorks support. */
4129
4130 #undef TARGET_LITTLE_SYM
4131 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4132 #undef TARGET_LITTLE_NAME
4133 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4134 #undef ELF_OSABI
4135
4136 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4137
4138 static struct bfd_link_hash_table *
4139 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4140 {
4141 struct bfd_link_hash_table *ret;
4142 struct elf_i386_link_hash_table *htab;
4143
4144 ret = elf_i386_link_hash_table_create (abfd);
4145 if (ret)
4146 {
4147 htab = (struct elf_i386_link_hash_table *) ret;
4148 htab->is_vxworks = 1;
4149 htab->plt0_pad_byte = 0x90;
4150 }
4151
4152 return ret;
4153 }
4154
4155
4156 #undef elf_backend_relocs_compatible
4157 #undef elf_backend_post_process_headers
4158 #undef bfd_elf32_bfd_link_hash_table_create
4159 #define bfd_elf32_bfd_link_hash_table_create \
4160 elf_i386_vxworks_link_hash_table_create
4161 #undef elf_backend_add_symbol_hook
4162 #define elf_backend_add_symbol_hook \
4163 elf_vxworks_add_symbol_hook
4164 #undef elf_backend_link_output_symbol_hook
4165 #define elf_backend_link_output_symbol_hook \
4166 elf_vxworks_link_output_symbol_hook
4167 #undef elf_backend_emit_relocs
4168 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4169 #undef elf_backend_final_write_processing
4170 #define elf_backend_final_write_processing \
4171 elf_vxworks_final_write_processing
4172
4173 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4174 define it. */
4175 #undef elf_backend_want_plt_sym
4176 #define elf_backend_want_plt_sym 1
4177
4178 #undef elf32_bed
4179 #define elf32_bed elf32_i386_vxworks_bed
4180
4181 #include "elf32-target.h"
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