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* po/bg.po: New Bulgarian translation.
[binutils.git] / bfd / elf32-i386.c
blob016e04611af3537909cc26b4b0b14cad20ed3562
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, 2009 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 #include "objalloc.h"
30 #include "hashtab.h"
31
32 /* 386 uses REL relocations instead of RELA. */
33 #define USE_REL 1
34
35 #include "elf/i386.h"
36
37 static reloc_howto_type elf_howto_table[]=
38 {
39 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
40 bfd_elf_generic_reloc, "R_386_NONE",
41 TRUE, 0x00000000, 0x00000000, FALSE),
42 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_32",
44 TRUE, 0xffffffff, 0xffffffff, FALSE),
45 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_PC32",
47 TRUE, 0xffffffff, 0xffffffff, TRUE),
48 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_GOT32",
50 TRUE, 0xffffffff, 0xffffffff, FALSE),
51 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_PLT32",
53 TRUE, 0xffffffff, 0xffffffff, TRUE),
54 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_COPY",
56 TRUE, 0xffffffff, 0xffffffff, FALSE),
57 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_RELATIVE",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_GOTOFF",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTPC",
71 TRUE, 0xffffffff, 0xffffffff, TRUE),
72
73 /* We have a gap in the reloc numbers here.
74 R_386_standard counts the number up to this point, and
75 R_386_ext_offset is the value to subtract from a reloc type of
76 R_386_16 thru R_386_PC8 to form an index into this table. */
77 #define R_386_standard (R_386_GOTPC + 1)
78 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
79
80 /* These relocs are a GNU extension. */
81 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
83 TRUE, 0xffffffff, 0xffffffff, FALSE),
84 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_IE",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_LE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_GD",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_LDM",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_16",
101 TRUE, 0xffff, 0xffff, FALSE),
102 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_PC16",
104 TRUE, 0xffff, 0xffff, TRUE),
105 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_8",
107 TRUE, 0xff, 0xff, FALSE),
108 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
109 bfd_elf_generic_reloc, "R_386_PC8",
110 TRUE, 0xff, 0xff, TRUE),
111
112 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
113 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
114 /* These are common with Solaris TLS implementation. */
115 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
117 TRUE, 0xffffffff, 0xffffffff, FALSE),
118 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 EMPTY_HOWTO (38),
134 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
139 FALSE, 0, 0, FALSE),
140 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_IRELATIVE",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #ifdef DEBUG_GEN_RELOC
186 #define TRACE(str) \
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
188 #else
189 #define TRACE(str)
190 #endif
191
192 static reloc_howto_type *
193 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
194 bfd_reloc_code_real_type code)
195 {
196 switch (code)
197 {
198 case BFD_RELOC_NONE:
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table[R_386_NONE];
201
202 case BFD_RELOC_32:
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table[R_386_32];
205
206 case BFD_RELOC_CTOR:
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_32_PCREL:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table[R_386_PC32];
213
214 case BFD_RELOC_386_GOT32:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table[R_386_GOT32];
217
218 case BFD_RELOC_386_PLT32:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table[R_386_PLT32];
221
222 case BFD_RELOC_386_COPY:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table[R_386_COPY];
225
226 case BFD_RELOC_386_GLOB_DAT:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table[R_386_GLOB_DAT];
229
230 case BFD_RELOC_386_JUMP_SLOT:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table[R_386_JUMP_SLOT];
233
234 case BFD_RELOC_386_RELATIVE:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table[R_386_RELATIVE];
237
238 case BFD_RELOC_386_GOTOFF:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table[R_386_GOTOFF];
241
242 case BFD_RELOC_386_GOTPC:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table[R_386_GOTPC];
245
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
250
251 case BFD_RELOC_386_TLS_IE:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_GOTIE:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_LE:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_GD:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_LDM:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
270
271 case BFD_RELOC_16:
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table[R_386_16 - R_386_ext_offset];
274
275 case BFD_RELOC_16_PCREL:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
278
279 case BFD_RELOC_8:
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table[R_386_8 - R_386_ext_offset];
282
283 case BFD_RELOC_8_PCREL:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
286
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
291
292 case BFD_RELOC_386_TLS_IE_32:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_LE_32:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_DTPMOD32:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPOFF32:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_TPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_386_TLS_GOTDESC:
313 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
314 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
315
316 case BFD_RELOC_386_TLS_DESC_CALL:
317 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
318 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_DESC:
321 TRACE ("BFD_RELOC_386_TLS_DESC");
322 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
323
324 case BFD_RELOC_386_IRELATIVE:
325 TRACE ("BFD_RELOC_386_IRELATIVE");
326 return &elf_howto_table[R_386_IRELATIVE];
327
328 case BFD_RELOC_VTABLE_INHERIT:
329 TRACE ("BFD_RELOC_VTABLE_INHERIT");
330 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
331
332 case BFD_RELOC_VTABLE_ENTRY:
333 TRACE ("BFD_RELOC_VTABLE_ENTRY");
334 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
335
336 default:
337 break;
338 }
339
340 TRACE ("Unknown");
341 return 0;
342 }
343
344 static reloc_howto_type *
345 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
346 const char *r_name)
347 {
348 unsigned int i;
349
350 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
351 if (elf_howto_table[i].name != NULL
352 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
353 return &elf_howto_table[i];
354
355 return NULL;
356 }
357
358 static reloc_howto_type *
359 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
360 {
361 unsigned int indx;
362
363 if ((indx = r_type) >= R_386_standard
364 && ((indx = r_type - R_386_ext_offset) - R_386_standard
365 >= R_386_ext - R_386_standard)
366 && ((indx = r_type - R_386_tls_offset) - R_386_ext
367 >= R_386_irelative - R_386_ext)
368 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
369 >= R_386_vt - R_386_irelative))
370 {
371 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
372 abfd, (int) r_type);
373 indx = R_386_NONE;
374 }
375 BFD_ASSERT (elf_howto_table [indx].type == r_type);
376 return &elf_howto_table[indx];
377 }
378
379 static void
380 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
381 arelent *cache_ptr,
382 Elf_Internal_Rela *dst)
383 {
384 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
385 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
386 }
387
388 /* Return whether a symbol name implies a local label. The UnixWare
389 2.1 cc generates temporary symbols that start with .X, so we
390 recognize them here. FIXME: do other SVR4 compilers also use .X?.
391 If so, we should move the .X recognition into
392 _bfd_elf_is_local_label_name. */
393
394 static bfd_boolean
395 elf_i386_is_local_label_name (bfd *abfd, const char *name)
396 {
397 if (name[0] == '.' && name[1] == 'X')
398 return TRUE;
399
400 return _bfd_elf_is_local_label_name (abfd, name);
401 }
402 \f
403 /* Support for core dump NOTE sections. */
404
405 static bfd_boolean
406 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
407 {
408 int offset;
409 size_t size;
410
411 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
412 {
413 int pr_version = bfd_get_32 (abfd, note->descdata);
414
415 if (pr_version != 1)
416 return FALSE;
417
418 /* pr_cursig */
419 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
420
421 /* pr_pid */
422 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
423
424 /* pr_reg */
425 offset = 28;
426 size = bfd_get_32 (abfd, note->descdata + 8);
427 }
428 else
429 {
430 switch (note->descsz)
431 {
432 default:
433 return FALSE;
434
435 case 144: /* Linux/i386 */
436 /* pr_cursig */
437 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
438
439 /* pr_pid */
440 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
441
442 /* pr_reg */
443 offset = 72;
444 size = 68;
445
446 break;
447 }
448 }
449
450 /* Make a ".reg/999" section. */
451 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
452 size, note->descpos + offset);
453 }
454
455 static bfd_boolean
456 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
457 {
458 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
459 {
460 int pr_version = bfd_get_32 (abfd, note->descdata);
461
462 if (pr_version != 1)
463 return FALSE;
464
465 elf_tdata (abfd)->core_program
466 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
467 elf_tdata (abfd)->core_command
468 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
469 }
470 else
471 {
472 switch (note->descsz)
473 {
474 default:
475 return FALSE;
476
477 case 124: /* Linux/i386 elf_prpsinfo. */
478 elf_tdata (abfd)->core_program
479 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
480 elf_tdata (abfd)->core_command
481 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
482 }
483 }
484
485 /* Note that for some reason, a spurious space is tacked
486 onto the end of the args in some (at least one anyway)
487 implementations, so strip it off if it exists. */
488 {
489 char *command = elf_tdata (abfd)->core_command;
490 int n = strlen (command);
491
492 if (0 < n && command[n - 1] == ' ')
493 command[n - 1] = '\0';
494 }
495
496 return TRUE;
497 }
498 \f
499 /* Functions for the i386 ELF linker.
500
501 In order to gain some understanding of code in this file without
502 knowing all the intricate details of the linker, note the
503 following:
504
505 Functions named elf_i386_* are called by external routines, other
506 functions are only called locally. elf_i386_* functions appear
507 in this file more or less in the order in which they are called
508 from external routines. eg. elf_i386_check_relocs is called
509 early in the link process, elf_i386_finish_dynamic_sections is
510 one of the last functions. */
511
512
513 /* The name of the dynamic interpreter. This is put in the .interp
514 section. */
515
516 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
517
518 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
519 copying dynamic variables from a shared lib into an app's dynbss
520 section, and instead use a dynamic relocation to point into the
521 shared lib. */
522 #define ELIMINATE_COPY_RELOCS 1
523
524 /* The size in bytes of an entry in the procedure linkage table. */
525
526 #define PLT_ENTRY_SIZE 16
527
528 /* The first entry in an absolute procedure linkage table looks like
529 this. See the SVR4 ABI i386 supplement to see how this works.
530 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
531
532 static const bfd_byte elf_i386_plt0_entry[12] =
533 {
534 0xff, 0x35, /* pushl contents of address */
535 0, 0, 0, 0, /* replaced with address of .got + 4. */
536 0xff, 0x25, /* jmp indirect */
537 0, 0, 0, 0 /* replaced with address of .got + 8. */
538 };
539
540 /* Subsequent entries in an absolute procedure linkage table look like
541 this. */
542
543 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
544 {
545 0xff, 0x25, /* jmp indirect */
546 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
547 0x68, /* pushl immediate */
548 0, 0, 0, 0, /* replaced with offset into relocation table. */
549 0xe9, /* jmp relative */
550 0, 0, 0, 0 /* replaced with offset to start of .plt. */
551 };
552
553 /* The first entry in a PIC procedure linkage table look like this.
554 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
555
556 static const bfd_byte elf_i386_pic_plt0_entry[12] =
557 {
558 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
559 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
560 };
561
562 /* Subsequent entries in a PIC procedure linkage table look like this. */
563
564 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
565 {
566 0xff, 0xa3, /* jmp *offset(%ebx) */
567 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
568 0x68, /* pushl immediate */
569 0, 0, 0, 0, /* replaced with offset into relocation table. */
570 0xe9, /* jmp relative */
571 0, 0, 0, 0 /* replaced with offset to start of .plt. */
572 };
573
574 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
575 for the PLTResolve stub and then for each PLT entry. */
576 #define PLTRESOLVE_RELOCS_SHLIB 0
577 #define PLTRESOLVE_RELOCS 2
578 #define PLT_NON_JUMP_SLOT_RELOCS 2
579
580 /* i386 ELF linker hash entry. */
581
582 struct elf_i386_link_hash_entry
583 {
584 struct elf_link_hash_entry elf;
585
586 /* Track dynamic relocs copied for this symbol. */
587 struct elf_dyn_relocs *dyn_relocs;
588
589 #define GOT_UNKNOWN 0
590 #define GOT_NORMAL 1
591 #define GOT_TLS_GD 2
592 #define GOT_TLS_IE 4
593 #define GOT_TLS_IE_POS 5
594 #define GOT_TLS_IE_NEG 6
595 #define GOT_TLS_IE_BOTH 7
596 #define GOT_TLS_GDESC 8
597 #define GOT_TLS_GD_BOTH_P(type) \
598 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
599 #define GOT_TLS_GD_P(type) \
600 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
601 #define GOT_TLS_GDESC_P(type) \
602 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
603 #define GOT_TLS_GD_ANY_P(type) \
604 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
605 unsigned char tls_type;
606
607 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
608 starting at the end of the jump table. */
609 bfd_vma tlsdesc_got;
610 };
611
612 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
613
614 struct elf_i386_obj_tdata
615 {
616 struct elf_obj_tdata root;
617
618 /* tls_type for each local got entry. */
619 char *local_got_tls_type;
620
621 /* GOTPLT entries for TLS descriptors. */
622 bfd_vma *local_tlsdesc_gotent;
623 };
624
625 #define elf_i386_tdata(abfd) \
626 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
627
628 #define elf_i386_local_got_tls_type(abfd) \
629 (elf_i386_tdata (abfd)->local_got_tls_type)
630
631 #define elf_i386_local_tlsdesc_gotent(abfd) \
632 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
633
634 #define is_i386_elf(bfd) \
635 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
636 && elf_tdata (bfd) != NULL \
637 && elf_object_id (bfd) == I386_ELF_TDATA)
638
639 static bfd_boolean
640 elf_i386_mkobject (bfd *abfd)
641 {
642 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
643 I386_ELF_TDATA);
644 }
645
646 /* i386 ELF linker hash table. */
647
648 struct elf_i386_link_hash_table
649 {
650 struct elf_link_hash_table elf;
651
652 /* Short-cuts to get to dynamic linker sections. */
653 asection *sdynbss;
654 asection *srelbss;
655
656 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
657 asection *srelplt2;
658
659 /* True if the target system is VxWorks. */
660 int is_vxworks;
661
662 /* Value used to fill the last word of the first plt entry. */
663 bfd_byte plt0_pad_byte;
664
665 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
666 bfd_vma next_tls_desc_index;
667
668 union {
669 bfd_signed_vma refcount;
670 bfd_vma offset;
671 } tls_ldm_got;
672
673 /* The amount of space used by the reserved portion of the sgotplt
674 section, plus whatever space is used by the jump slots. */
675 bfd_vma sgotplt_jump_table_size;
676
677 /* Small local sym cache. */
678 struct sym_cache sym_cache;
679
680 /* _TLS_MODULE_BASE_ symbol. */
681 struct bfd_link_hash_entry *tls_module_base;
682
683 /* Used by local STT_GNU_IFUNC symbols. */
684 htab_t loc_hash_table;
685 void *loc_hash_memory;
686 };
687
688 /* Get the i386 ELF linker hash table from a link_info structure. */
689
690 #define elf_i386_hash_table(p) \
691 ((struct elf_i386_link_hash_table *) ((p)->hash))
692
693 #define elf_i386_compute_jump_table_size(htab) \
694 ((htab)->next_tls_desc_index * 4)
695
696 /* Create an entry in an i386 ELF linker hash table. */
697
698 static struct bfd_hash_entry *
699 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
700 struct bfd_hash_table *table,
701 const char *string)
702 {
703 /* Allocate the structure if it has not already been allocated by a
704 subclass. */
705 if (entry == NULL)
706 {
707 entry = (struct bfd_hash_entry *)
708 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
709 if (entry == NULL)
710 return entry;
711 }
712
713 /* Call the allocation method of the superclass. */
714 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
715 if (entry != NULL)
716 {
717 struct elf_i386_link_hash_entry *eh;
718
719 eh = (struct elf_i386_link_hash_entry *) entry;
720 eh->dyn_relocs = NULL;
721 eh->tls_type = GOT_UNKNOWN;
722 eh->tlsdesc_got = (bfd_vma) -1;
723 }
724
725 return entry;
726 }
727
728 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
729 for local symbol so that we can handle local STT_GNU_IFUNC symbols
730 as global symbol. We reuse indx and dynstr_index for local symbol
731 hash since they aren't used by global symbols in this backend. */
732
733 static hashval_t
734 elf_i386_local_htab_hash (const void *ptr)
735 {
736 struct elf_link_hash_entry *h
737 = (struct elf_link_hash_entry *) ptr;
738 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
739 }
740
741 /* Compare local hash entries. */
742
743 static int
744 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
745 {
746 struct elf_link_hash_entry *h1
747 = (struct elf_link_hash_entry *) ptr1;
748 struct elf_link_hash_entry *h2
749 = (struct elf_link_hash_entry *) ptr2;
750
751 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
752 }
753
754 /* Find and/or create a hash entry for local symbol. */
755
756 static struct elf_link_hash_entry *
757 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
758 bfd *abfd, const Elf_Internal_Rela *rel,
759 bfd_boolean create)
760 {
761 struct elf_i386_link_hash_entry e, *ret;
762 asection *sec = abfd->sections;
763 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
764 ELF32_R_SYM (rel->r_info));
765 void **slot;
766
767 e.elf.indx = sec->id;
768 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
769 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
770 create ? INSERT : NO_INSERT);
771
772 if (!slot)
773 return NULL;
774
775 if (*slot)
776 {
777 ret = (struct elf_i386_link_hash_entry *) *slot;
778 return &ret->elf;
779 }
780
781 ret = (struct elf_i386_link_hash_entry *)
782 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
783 sizeof (struct elf_i386_link_hash_entry));
784 if (ret)
785 {
786 memset (ret, 0, sizeof (*ret));
787 ret->elf.indx = sec->id;
788 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
789 ret->elf.dynindx = -1;
790 ret->elf.plt.offset = (bfd_vma) -1;
791 ret->elf.got.offset = (bfd_vma) -1;
792 *slot = ret;
793 }
794 return &ret->elf;
795 }
796
797 /* Create an i386 ELF linker hash table. */
798
799 static struct bfd_link_hash_table *
800 elf_i386_link_hash_table_create (bfd *abfd)
801 {
802 struct elf_i386_link_hash_table *ret;
803 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
804
805 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
806 if (ret == NULL)
807 return NULL;
808
809 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
810 elf_i386_link_hash_newfunc,
811 sizeof (struct elf_i386_link_hash_entry)))
812 {
813 free (ret);
814 return NULL;
815 }
816
817 ret->sdynbss = NULL;
818 ret->srelbss = NULL;
819 ret->tls_ldm_got.refcount = 0;
820 ret->next_tls_desc_index = 0;
821 ret->sgotplt_jump_table_size = 0;
822 ret->sym_cache.abfd = NULL;
823 ret->is_vxworks = 0;
824 ret->srelplt2 = NULL;
825 ret->plt0_pad_byte = 0;
826 ret->tls_module_base = NULL;
827
828 ret->loc_hash_table = htab_try_create (1024,
829 elf_i386_local_htab_hash,
830 elf_i386_local_htab_eq,
831 NULL);
832 ret->loc_hash_memory = objalloc_create ();
833 if (!ret->loc_hash_table || !ret->loc_hash_memory)
834 {
835 free (ret);
836 return NULL;
837 }
838
839 return &ret->elf.root;
840 }
841
842 /* Destroy an i386 ELF linker hash table. */
843
844 static void
845 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
846 {
847 struct elf_i386_link_hash_table *htab
848 = (struct elf_i386_link_hash_table *) hash;
849
850 if (htab->loc_hash_table)
851 htab_delete (htab->loc_hash_table);
852 if (htab->loc_hash_memory)
853 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
854 _bfd_generic_link_hash_table_free (hash);
855 }
856
857 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
858 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
859 hash table. */
860
861 static bfd_boolean
862 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
863 {
864 struct elf_i386_link_hash_table *htab;
865
866 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
867 return FALSE;
868
869 htab = elf_i386_hash_table (info);
870 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
871 if (!info->shared)
872 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
873
874 if (!htab->sdynbss
875 || (!info->shared && !htab->srelbss))
876 abort ();
877
878 if (htab->is_vxworks
879 && !elf_vxworks_create_dynamic_sections (dynobj, info,
880 &htab->srelplt2))
881 return FALSE;
882
883 return TRUE;
884 }
885
886 /* Copy the extra info we tack onto an elf_link_hash_entry. */
887
888 static void
889 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
890 struct elf_link_hash_entry *dir,
891 struct elf_link_hash_entry *ind)
892 {
893 struct elf_i386_link_hash_entry *edir, *eind;
894
895 edir = (struct elf_i386_link_hash_entry *) dir;
896 eind = (struct elf_i386_link_hash_entry *) ind;
897
898 if (eind->dyn_relocs != NULL)
899 {
900 if (edir->dyn_relocs != NULL)
901 {
902 struct elf_dyn_relocs **pp;
903 struct elf_dyn_relocs *p;
904
905 /* Add reloc counts against the indirect sym to the direct sym
906 list. Merge any entries against the same section. */
907 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
908 {
909 struct elf_dyn_relocs *q;
910
911 for (q = edir->dyn_relocs; q != NULL; q = q->next)
912 if (q->sec == p->sec)
913 {
914 q->pc_count += p->pc_count;
915 q->count += p->count;
916 *pp = p->next;
917 break;
918 }
919 if (q == NULL)
920 pp = &p->next;
921 }
922 *pp = edir->dyn_relocs;
923 }
924
925 edir->dyn_relocs = eind->dyn_relocs;
926 eind->dyn_relocs = NULL;
927 }
928
929 if (ind->root.type == bfd_link_hash_indirect
930 && dir->got.refcount <= 0)
931 {
932 edir->tls_type = eind->tls_type;
933 eind->tls_type = GOT_UNKNOWN;
934 }
935
936 if (ELIMINATE_COPY_RELOCS
937 && ind->root.type != bfd_link_hash_indirect
938 && dir->dynamic_adjusted)
939 {
940 /* If called to transfer flags for a weakdef during processing
941 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
942 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
943 dir->ref_dynamic |= ind->ref_dynamic;
944 dir->ref_regular |= ind->ref_regular;
945 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
946 dir->needs_plt |= ind->needs_plt;
947 dir->pointer_equality_needed |= ind->pointer_equality_needed;
948 }
949 else
950 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
951 }
952
953 typedef union
954 {
955 unsigned char c[2];
956 uint16_t i;
957 }
958 i386_opcode16;
959
960 /* Return TRUE if the TLS access code sequence support transition
961 from R_TYPE. */
962
963 static bfd_boolean
964 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
965 bfd_byte *contents,
966 Elf_Internal_Shdr *symtab_hdr,
967 struct elf_link_hash_entry **sym_hashes,
968 unsigned int r_type,
969 const Elf_Internal_Rela *rel,
970 const Elf_Internal_Rela *relend)
971 {
972 unsigned int val, type;
973 unsigned long r_symndx;
974 struct elf_link_hash_entry *h;
975 bfd_vma offset;
976
977 /* Get the section contents. */
978 if (contents == NULL)
979 {
980 if (elf_section_data (sec)->this_hdr.contents != NULL)
981 contents = elf_section_data (sec)->this_hdr.contents;
982 else
983 {
984 /* FIXME: How to better handle error condition? */
985 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
986 return FALSE;
987
988 /* Cache the section contents for elf_link_input_bfd. */
989 elf_section_data (sec)->this_hdr.contents = contents;
990 }
991 }
992
993 offset = rel->r_offset;
994 switch (r_type)
995 {
996 case R_386_TLS_GD:
997 case R_386_TLS_LDM:
998 if (offset < 2 || (rel + 1) >= relend)
999 return FALSE;
1000
1001 type = bfd_get_8 (abfd, contents + offset - 2);
1002 if (r_type == R_386_TLS_GD)
1003 {
1004 /* Check transition from GD access model. Only
1005 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1006 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1007 can transit to different access model. */
1008 if ((offset + 10) > sec->size ||
1009 (type != 0x8d && type != 0x04))
1010 return FALSE;
1011
1012 val = bfd_get_8 (abfd, contents + offset - 1);
1013 if (type == 0x04)
1014 {
1015 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1016 if (offset < 3)
1017 return FALSE;
1018
1019 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1020 return FALSE;
1021
1022 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1023 return FALSE;
1024 }
1025 else
1026 {
1027 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1028 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1029 return FALSE;
1030
1031 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1032 return FALSE;
1033 }
1034 }
1035 else
1036 {
1037 /* Check transition from LD access model. Only
1038 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1039 can transit to different access model. */
1040 if (type != 0x8d || (offset + 9) > sec->size)
1041 return FALSE;
1042
1043 val = bfd_get_8 (abfd, contents + offset - 1);
1044 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1045 return FALSE;
1046 }
1047
1048 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1049 return FALSE;
1050
1051 r_symndx = ELF32_R_SYM (rel[1].r_info);
1052 if (r_symndx < symtab_hdr->sh_info)
1053 return FALSE;
1054
1055 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1056 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1057 may be versioned. */
1058 return (h != NULL
1059 && h->root.root.string != NULL
1060 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1061 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1062 && (strncmp (h->root.root.string, "___tls_get_addr",
1063 15) == 0));
1064
1065 case R_386_TLS_IE:
1066 /* Check transition from IE access model:
1067 movl foo@indntpoff(%rip), %eax
1068 movl foo@indntpoff(%rip), %reg
1069 addl foo@indntpoff(%rip), %reg
1070 */
1071
1072 if (offset < 1 || (offset + 4) > sec->size)
1073 return FALSE;
1074
1075 /* Check "movl foo@tpoff(%rip), %eax" first. */
1076 val = bfd_get_8 (abfd, contents + offset - 1);
1077 if (val == 0xa1)
1078 return TRUE;
1079
1080 if (offset < 2)
1081 return FALSE;
1082
1083 /* Check movl|addl foo@tpoff(%rip), %reg. */
1084 type = bfd_get_8 (abfd, contents + offset - 2);
1085 return ((type == 0x8b || type == 0x03)
1086 && (val & 0xc7) == 0x05);
1087
1088 case R_386_TLS_GOTIE:
1089 case R_386_TLS_IE_32:
1090 /* Check transition from {IE_32,GOTIE} access model:
1091 subl foo@{tpoff,gontoff}(%reg1), %reg2
1092 movl foo@{tpoff,gontoff}(%reg1), %reg2
1093 addl foo@{tpoff,gontoff}(%reg1), %reg2
1094 */
1095
1096 if (offset < 2 || (offset + 4) > sec->size)
1097 return FALSE;
1098
1099 val = bfd_get_8 (abfd, contents + offset - 1);
1100 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1101 return FALSE;
1102
1103 type = bfd_get_8 (abfd, contents + offset - 2);
1104 return type == 0x8b || type == 0x2b || type == 0x03;
1105
1106 case R_386_TLS_GOTDESC:
1107 /* Check transition from GDesc access model:
1108 leal x@tlsdesc(%ebx), %eax
1109
1110 Make sure it's a leal adding ebx to a 32-bit offset
1111 into any register, although it's probably almost always
1112 going to be eax. */
1113
1114 if (offset < 2 || (offset + 4) > sec->size)
1115 return FALSE;
1116
1117 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1118 return FALSE;
1119
1120 val = bfd_get_8 (abfd, contents + offset - 1);
1121 return (val & 0xc7) == 0x83;
1122
1123 case R_386_TLS_DESC_CALL:
1124 /* Check transition from GDesc access model:
1125 call *x@tlsdesc(%rax)
1126 */
1127 if (offset + 2 <= sec->size)
1128 {
1129 /* Make sure that it's a call *x@tlsdesc(%rax). */
1130 static i386_opcode16 call = { { 0xff, 0x10 } };
1131 return bfd_get_16 (abfd, contents + offset) == call.i;
1132 }
1133
1134 return FALSE;
1135
1136 default:
1137 abort ();
1138 }
1139 }
1140
1141 /* Return TRUE if the TLS access transition is OK or no transition
1142 will be performed. Update R_TYPE if there is a transition. */
1143
1144 static bfd_boolean
1145 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1146 asection *sec, bfd_byte *contents,
1147 Elf_Internal_Shdr *symtab_hdr,
1148 struct elf_link_hash_entry **sym_hashes,
1149 unsigned int *r_type, int tls_type,
1150 const Elf_Internal_Rela *rel,
1151 const Elf_Internal_Rela *relend,
1152 struct elf_link_hash_entry *h,
1153 unsigned long r_symndx)
1154 {
1155 unsigned int from_type = *r_type;
1156 unsigned int to_type = from_type;
1157 bfd_boolean check = TRUE;
1158
1159 switch (from_type)
1160 {
1161 case R_386_TLS_GD:
1162 case R_386_TLS_GOTDESC:
1163 case R_386_TLS_DESC_CALL:
1164 case R_386_TLS_IE_32:
1165 case R_386_TLS_IE:
1166 case R_386_TLS_GOTIE:
1167 if (info->executable)
1168 {
1169 if (h == NULL)
1170 to_type = R_386_TLS_LE_32;
1171 else if (from_type != R_386_TLS_IE
1172 && from_type != R_386_TLS_GOTIE)
1173 to_type = R_386_TLS_IE_32;
1174 }
1175
1176 /* When we are called from elf_i386_relocate_section, CONTENTS
1177 isn't NULL and there may be additional transitions based on
1178 TLS_TYPE. */
1179 if (contents != NULL)
1180 {
1181 unsigned int new_to_type = to_type;
1182
1183 if (info->executable
1184 && h != NULL
1185 && h->dynindx == -1
1186 && (tls_type & GOT_TLS_IE))
1187 new_to_type = R_386_TLS_LE_32;
1188
1189 if (to_type == R_386_TLS_GD
1190 || to_type == R_386_TLS_GOTDESC
1191 || to_type == R_386_TLS_DESC_CALL)
1192 {
1193 if (tls_type == GOT_TLS_IE_POS)
1194 new_to_type = R_386_TLS_GOTIE;
1195 else if (tls_type & GOT_TLS_IE)
1196 new_to_type = R_386_TLS_IE_32;
1197 }
1198
1199 /* We checked the transition before when we were called from
1200 elf_i386_check_relocs. We only want to check the new
1201 transition which hasn't been checked before. */
1202 check = new_to_type != to_type && from_type == to_type;
1203 to_type = new_to_type;
1204 }
1205
1206 break;
1207
1208 case R_386_TLS_LDM:
1209 if (info->executable)
1210 to_type = R_386_TLS_LE_32;
1211 break;
1212
1213 default:
1214 return TRUE;
1215 }
1216
1217 /* Return TRUE if there is no transition. */
1218 if (from_type == to_type)
1219 return TRUE;
1220
1221 /* Check if the transition can be performed. */
1222 if (check
1223 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1224 symtab_hdr, sym_hashes,
1225 from_type, rel, relend))
1226 {
1227 reloc_howto_type *from, *to;
1228 const char *name;
1229
1230 from = elf_i386_rtype_to_howto (abfd, from_type);
1231 to = elf_i386_rtype_to_howto (abfd, to_type);
1232
1233 if (h)
1234 name = h->root.root.string;
1235 else
1236 {
1237 Elf_Internal_Sym *isym;
1238 struct elf_i386_link_hash_table *htab;
1239 htab = elf_i386_hash_table (info);
1240 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1241 abfd, r_symndx);
1242 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1243 }
1244
1245 (*_bfd_error_handler)
1246 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1247 "in section `%A' failed"),
1248 abfd, sec, from->name, to->name, name,
1249 (unsigned long) rel->r_offset);
1250 bfd_set_error (bfd_error_bad_value);
1251 return FALSE;
1252 }
1253
1254 *r_type = to_type;
1255 return TRUE;
1256 }
1257
1258 /* Look through the relocs for a section during the first phase, and
1259 calculate needed space in the global offset table, procedure linkage
1260 table, and dynamic reloc sections. */
1261
1262 static bfd_boolean
1263 elf_i386_check_relocs (bfd *abfd,
1264 struct bfd_link_info *info,
1265 asection *sec,
1266 const Elf_Internal_Rela *relocs)
1267 {
1268 struct elf_i386_link_hash_table *htab;
1269 Elf_Internal_Shdr *symtab_hdr;
1270 struct elf_link_hash_entry **sym_hashes;
1271 const Elf_Internal_Rela *rel;
1272 const Elf_Internal_Rela *rel_end;
1273 asection *sreloc;
1274
1275 if (info->relocatable)
1276 return TRUE;
1277
1278 BFD_ASSERT (is_i386_elf (abfd));
1279
1280 htab = elf_i386_hash_table (info);
1281 symtab_hdr = &elf_symtab_hdr (abfd);
1282 sym_hashes = elf_sym_hashes (abfd);
1283
1284 sreloc = NULL;
1285
1286 rel_end = relocs + sec->reloc_count;
1287 for (rel = relocs; rel < rel_end; rel++)
1288 {
1289 unsigned int r_type;
1290 unsigned long r_symndx;
1291 struct elf_link_hash_entry *h;
1292 Elf_Internal_Sym *isym;
1293 const char *name;
1294
1295 r_symndx = ELF32_R_SYM (rel->r_info);
1296 r_type = ELF32_R_TYPE (rel->r_info);
1297
1298 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1299 {
1300 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1301 abfd,
1302 r_symndx);
1303 return FALSE;
1304 }
1305
1306 if (r_symndx < symtab_hdr->sh_info)
1307 {
1308 /* A local symbol. */
1309 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1310 abfd, r_symndx);
1311 if (isym == NULL)
1312 return FALSE;
1313
1314 /* Check relocation against local STT_GNU_IFUNC symbol. */
1315 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1316 {
1317 h = elf_i386_get_local_sym_hash (htab, abfd, rel,
1318 TRUE);
1319 if (h == NULL)
1320 return FALSE;
1321
1322 /* Fake a STT_GNU_IFUNC symbol. */
1323 h->type = STT_GNU_IFUNC;
1324 h->def_regular = 1;
1325 h->ref_regular = 1;
1326 h->forced_local = 1;
1327 h->root.type = bfd_link_hash_defined;
1328 }
1329 else
1330 h = NULL;
1331 }
1332 else
1333 {
1334 isym = NULL;
1335 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1336 while (h->root.type == bfd_link_hash_indirect
1337 || h->root.type == bfd_link_hash_warning)
1338 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1339 }
1340
1341 if (h != NULL)
1342 {
1343 /* Create the ifunc sections for static executables. If we
1344 never see an indirect function symbol nor we are building
1345 a static executable, those sections will be empty and
1346 won't appear in output. */
1347 switch (r_type)
1348 {
1349 default:
1350 break;
1351
1352 case R_386_32:
1353 case R_386_PC32:
1354 case R_386_PLT32:
1355 case R_386_GOT32:
1356 case R_386_GOTOFF:
1357 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1358 return FALSE;
1359 break;
1360 }
1361
1362 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1363 it here if it is defined in a non-shared object. */
1364 if (h->type == STT_GNU_IFUNC
1365 && h->def_regular)
1366 {
1367 /* It is referenced by a non-shared object. */
1368 h->ref_regular = 1;
1369 h->needs_plt = 1;
1370
1371 /* STT_GNU_IFUNC symbol must go through PLT. */
1372 h->plt.refcount += 1;
1373
1374 /* STT_GNU_IFUNC needs dynamic sections. */
1375 if (htab->elf.dynobj == NULL)
1376 htab->elf.dynobj = abfd;
1377
1378 switch (r_type)
1379 {
1380 default:
1381 if (h->root.root.string)
1382 name = h->root.root.string;
1383 else
1384 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1385 NULL);
1386 (*_bfd_error_handler)
1387 (_("%B: relocation %s against STT_GNU_IFUNC "
1388 "symbol `%s' isn't handled by %s"), abfd,
1389 elf_howto_table[r_type].name,
1390 name, __FUNCTION__);
1391 bfd_set_error (bfd_error_bad_value);
1392 return FALSE;
1393
1394 case R_386_32:
1395 h->non_got_ref = 1;
1396 h->pointer_equality_needed = 1;
1397 if (info->shared)
1398 {
1399 /* We must copy these reloc types into the
1400 output file. Create a reloc section in
1401 dynobj and make room for this reloc. */
1402 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1403 (abfd, info, sec, sreloc,
1404 &((struct elf_i386_link_hash_entry *) h)->dyn_relocs);
1405 if (sreloc == NULL)
1406 return FALSE;
1407 }
1408 break;
1409
1410 case R_386_PC32:
1411 h->non_got_ref = 1;
1412 break;
1413
1414 case R_386_PLT32:
1415 break;
1416
1417 case R_386_GOT32:
1418 case R_386_GOTOFF:
1419 h->got.refcount += 1;
1420 if (htab->elf.sgot == NULL
1421 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1422 info))
1423 return FALSE;
1424 break;
1425 }
1426
1427 continue;
1428 }
1429 }
1430
1431 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1432 symtab_hdr, sym_hashes,
1433 &r_type, GOT_UNKNOWN,
1434 rel, rel_end, h, r_symndx))
1435 return FALSE;
1436
1437 switch (r_type)
1438 {
1439 case R_386_TLS_LDM:
1440 htab->tls_ldm_got.refcount += 1;
1441 goto create_got;
1442
1443 case R_386_PLT32:
1444 /* This symbol requires a procedure linkage table entry. We
1445 actually build the entry in adjust_dynamic_symbol,
1446 because this might be a case of linking PIC code which is
1447 never referenced by a dynamic object, in which case we
1448 don't need to generate a procedure linkage table entry
1449 after all. */
1450
1451 /* If this is a local symbol, we resolve it directly without
1452 creating a procedure linkage table entry. */
1453 if (h == NULL)
1454 continue;
1455
1456 h->needs_plt = 1;
1457 h->plt.refcount += 1;
1458 break;
1459
1460 case R_386_TLS_IE_32:
1461 case R_386_TLS_IE:
1462 case R_386_TLS_GOTIE:
1463 if (!info->executable)
1464 info->flags |= DF_STATIC_TLS;
1465 /* Fall through */
1466
1467 case R_386_GOT32:
1468 case R_386_TLS_GD:
1469 case R_386_TLS_GOTDESC:
1470 case R_386_TLS_DESC_CALL:
1471 /* This symbol requires a global offset table entry. */
1472 {
1473 int tls_type, old_tls_type;
1474
1475 switch (r_type)
1476 {
1477 default:
1478 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1479 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1480 case R_386_TLS_GOTDESC:
1481 case R_386_TLS_DESC_CALL:
1482 tls_type = GOT_TLS_GDESC; break;
1483 case R_386_TLS_IE_32:
1484 if (ELF32_R_TYPE (rel->r_info) == r_type)
1485 tls_type = GOT_TLS_IE_NEG;
1486 else
1487 /* If this is a GD->IE transition, we may use either of
1488 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1489 tls_type = GOT_TLS_IE;
1490 break;
1491 case R_386_TLS_IE:
1492 case R_386_TLS_GOTIE:
1493 tls_type = GOT_TLS_IE_POS; break;
1494 }
1495
1496 if (h != NULL)
1497 {
1498 h->got.refcount += 1;
1499 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1500 }
1501 else
1502 {
1503 bfd_signed_vma *local_got_refcounts;
1504
1505 /* This is a global offset table entry for a local symbol. */
1506 local_got_refcounts = elf_local_got_refcounts (abfd);
1507 if (local_got_refcounts == NULL)
1508 {
1509 bfd_size_type size;
1510
1511 size = symtab_hdr->sh_info;
1512 size *= (sizeof (bfd_signed_vma)
1513 + sizeof (bfd_vma) + sizeof(char));
1514 local_got_refcounts = (bfd_signed_vma *)
1515 bfd_zalloc (abfd, size);
1516 if (local_got_refcounts == NULL)
1517 return FALSE;
1518 elf_local_got_refcounts (abfd) = local_got_refcounts;
1519 elf_i386_local_tlsdesc_gotent (abfd)
1520 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1521 elf_i386_local_got_tls_type (abfd)
1522 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1523 }
1524 local_got_refcounts[r_symndx] += 1;
1525 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1526 }
1527
1528 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1529 tls_type |= old_tls_type;
1530 /* If a TLS symbol is accessed using IE at least once,
1531 there is no point to use dynamic model for it. */
1532 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1533 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1534 || (tls_type & GOT_TLS_IE) == 0))
1535 {
1536 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1537 tls_type = old_tls_type;
1538 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1539 && GOT_TLS_GD_ANY_P (tls_type))
1540 tls_type |= old_tls_type;
1541 else
1542 {
1543 if (h)
1544 name = h->root.root.string;
1545 else
1546 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1547 NULL);
1548 (*_bfd_error_handler)
1549 (_("%B: `%s' accessed both as normal and "
1550 "thread local symbol"),
1551 abfd, name);
1552 return FALSE;
1553 }
1554 }
1555
1556 if (old_tls_type != tls_type)
1557 {
1558 if (h != NULL)
1559 elf_i386_hash_entry (h)->tls_type = tls_type;
1560 else
1561 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1562 }
1563 }
1564 /* Fall through */
1565
1566 case R_386_GOTOFF:
1567 case R_386_GOTPC:
1568 create_got:
1569 if (htab->elf.sgot == NULL)
1570 {
1571 if (htab->elf.dynobj == NULL)
1572 htab->elf.dynobj = abfd;
1573 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1574 return FALSE;
1575 }
1576 if (r_type != R_386_TLS_IE)
1577 break;
1578 /* Fall through */
1579
1580 case R_386_TLS_LE_32:
1581 case R_386_TLS_LE:
1582 if (info->executable)
1583 break;
1584 info->flags |= DF_STATIC_TLS;
1585 /* Fall through */
1586
1587 case R_386_32:
1588 case R_386_PC32:
1589 if (h != NULL && info->executable)
1590 {
1591 /* If this reloc is in a read-only section, we might
1592 need a copy reloc. We can't check reliably at this
1593 stage whether the section is read-only, as input
1594 sections have not yet been mapped to output sections.
1595 Tentatively set the flag for now, and correct in
1596 adjust_dynamic_symbol. */
1597 h->non_got_ref = 1;
1598
1599 /* We may need a .plt entry if the function this reloc
1600 refers to is in a shared lib. */
1601 h->plt.refcount += 1;
1602 if (r_type != R_386_PC32)
1603 h->pointer_equality_needed = 1;
1604 }
1605
1606 /* If we are creating a shared library, and this is a reloc
1607 against a global symbol, or a non PC relative reloc
1608 against a local symbol, then we need to copy the reloc
1609 into the shared library. However, if we are linking with
1610 -Bsymbolic, we do not need to copy a reloc against a
1611 global symbol which is defined in an object we are
1612 including in the link (i.e., DEF_REGULAR is set). At
1613 this point we have not seen all the input files, so it is
1614 possible that DEF_REGULAR is not set now but will be set
1615 later (it is never cleared). In case of a weak definition,
1616 DEF_REGULAR may be cleared later by a strong definition in
1617 a shared library. We account for that possibility below by
1618 storing information in the relocs_copied field of the hash
1619 table entry. A similar situation occurs when creating
1620 shared libraries and symbol visibility changes render the
1621 symbol local.
1622
1623 If on the other hand, we are creating an executable, we
1624 may need to keep relocations for symbols satisfied by a
1625 dynamic library if we manage to avoid copy relocs for the
1626 symbol. */
1627 if ((info->shared
1628 && (sec->flags & SEC_ALLOC) != 0
1629 && (r_type != R_386_PC32
1630 || (h != NULL
1631 && (! SYMBOLIC_BIND (info, h)
1632 || h->root.type == bfd_link_hash_defweak
1633 || !h->def_regular))))
1634 || (ELIMINATE_COPY_RELOCS
1635 && !info->shared
1636 && (sec->flags & SEC_ALLOC) != 0
1637 && h != NULL
1638 && (h->root.type == bfd_link_hash_defweak
1639 || !h->def_regular)))
1640 {
1641 struct elf_dyn_relocs *p;
1642 struct elf_dyn_relocs **head;
1643
1644 /* We must copy these reloc types into the output file.
1645 Create a reloc section in dynobj and make room for
1646 this reloc. */
1647 if (sreloc == NULL)
1648 {
1649 if (htab->elf.dynobj == NULL)
1650 htab->elf.dynobj = abfd;
1651
1652 sreloc = _bfd_elf_make_dynamic_reloc_section
1653 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1654
1655 if (sreloc == NULL)
1656 return FALSE;
1657 }
1658
1659 /* If this is a global symbol, we count the number of
1660 relocations we need for this symbol. */
1661 if (h != NULL)
1662 {
1663 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1664 }
1665 else
1666 {
1667 /* Track dynamic relocs needed for local syms too.
1668 We really need local syms available to do this
1669 easily. Oh well. */
1670 void **vpp;
1671 asection *s;
1672 Elf_Internal_Sym *isym;
1673
1674 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1675 abfd, r_symndx);
1676 if (isym == NULL)
1677 return FALSE;
1678
1679 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1680 if (s == NULL)
1681 s = sec;
1682
1683 vpp = &elf_section_data (s)->local_dynrel;
1684 head = (struct elf_dyn_relocs **)vpp;
1685 }
1686
1687 p = *head;
1688 if (p == NULL || p->sec != sec)
1689 {
1690 bfd_size_type amt = sizeof *p;
1691 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1692 amt);
1693 if (p == NULL)
1694 return FALSE;
1695 p->next = *head;
1696 *head = p;
1697 p->sec = sec;
1698 p->count = 0;
1699 p->pc_count = 0;
1700 }
1701
1702 p->count += 1;
1703 if (r_type == R_386_PC32)
1704 p->pc_count += 1;
1705 }
1706 break;
1707
1708 /* This relocation describes the C++ object vtable hierarchy.
1709 Reconstruct it for later use during GC. */
1710 case R_386_GNU_VTINHERIT:
1711 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1712 return FALSE;
1713 break;
1714
1715 /* This relocation describes which C++ vtable entries are actually
1716 used. Record for later use during GC. */
1717 case R_386_GNU_VTENTRY:
1718 BFD_ASSERT (h != NULL);
1719 if (h != NULL
1720 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1721 return FALSE;
1722 break;
1723
1724 default:
1725 break;
1726 }
1727 }
1728
1729 return TRUE;
1730 }
1731
1732 /* Return the section that should be marked against GC for a given
1733 relocation. */
1734
1735 static asection *
1736 elf_i386_gc_mark_hook (asection *sec,
1737 struct bfd_link_info *info,
1738 Elf_Internal_Rela *rel,
1739 struct elf_link_hash_entry *h,
1740 Elf_Internal_Sym *sym)
1741 {
1742 if (h != NULL)
1743 switch (ELF32_R_TYPE (rel->r_info))
1744 {
1745 case R_386_GNU_VTINHERIT:
1746 case R_386_GNU_VTENTRY:
1747 return NULL;
1748 }
1749
1750 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1751 }
1752
1753 /* Update the got entry reference counts for the section being removed. */
1754
1755 static bfd_boolean
1756 elf_i386_gc_sweep_hook (bfd *abfd,
1757 struct bfd_link_info *info,
1758 asection *sec,
1759 const Elf_Internal_Rela *relocs)
1760 {
1761 Elf_Internal_Shdr *symtab_hdr;
1762 struct elf_link_hash_entry **sym_hashes;
1763 bfd_signed_vma *local_got_refcounts;
1764 const Elf_Internal_Rela *rel, *relend;
1765
1766 if (info->relocatable)
1767 return TRUE;
1768
1769 elf_section_data (sec)->local_dynrel = NULL;
1770
1771 symtab_hdr = &elf_symtab_hdr (abfd);
1772 sym_hashes = elf_sym_hashes (abfd);
1773 local_got_refcounts = elf_local_got_refcounts (abfd);
1774
1775 relend = relocs + sec->reloc_count;
1776 for (rel = relocs; rel < relend; rel++)
1777 {
1778 unsigned long r_symndx;
1779 unsigned int r_type;
1780 struct elf_link_hash_entry *h = NULL;
1781
1782 r_symndx = ELF32_R_SYM (rel->r_info);
1783 if (r_symndx >= symtab_hdr->sh_info)
1784 {
1785 struct elf_i386_link_hash_entry *eh;
1786 struct elf_dyn_relocs **pp;
1787 struct elf_dyn_relocs *p;
1788
1789 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1790 while (h->root.type == bfd_link_hash_indirect
1791 || h->root.type == bfd_link_hash_warning)
1792 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1793 eh = (struct elf_i386_link_hash_entry *) h;
1794
1795 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1796 if (p->sec == sec)
1797 {
1798 /* Everything must go for SEC. */
1799 *pp = p->next;
1800 break;
1801 }
1802 }
1803
1804 r_type = ELF32_R_TYPE (rel->r_info);
1805 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1806 symtab_hdr, sym_hashes,
1807 &r_type, GOT_UNKNOWN,
1808 rel, relend, h, r_symndx))
1809 return FALSE;
1810
1811 switch (r_type)
1812 {
1813 case R_386_TLS_LDM:
1814 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1815 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1816 break;
1817
1818 case R_386_TLS_GD:
1819 case R_386_TLS_GOTDESC:
1820 case R_386_TLS_DESC_CALL:
1821 case R_386_TLS_IE_32:
1822 case R_386_TLS_IE:
1823 case R_386_TLS_GOTIE:
1824 case R_386_GOT32:
1825 if (h != NULL)
1826 {
1827 if (h->got.refcount > 0)
1828 h->got.refcount -= 1;
1829 }
1830 else if (local_got_refcounts != NULL)
1831 {
1832 if (local_got_refcounts[r_symndx] > 0)
1833 local_got_refcounts[r_symndx] -= 1;
1834 }
1835 break;
1836
1837 case R_386_32:
1838 case R_386_PC32:
1839 if (info->shared)
1840 break;
1841 /* Fall through */
1842
1843 case R_386_PLT32:
1844 if (h != NULL)
1845 {
1846 if (h->plt.refcount > 0)
1847 h->plt.refcount -= 1;
1848 }
1849 break;
1850
1851 default:
1852 break;
1853 }
1854 }
1855
1856 return TRUE;
1857 }
1858
1859 /* Adjust a symbol defined by a dynamic object and referenced by a
1860 regular object. The current definition is in some section of the
1861 dynamic object, but we're not including those sections. We have to
1862 change the definition to something the rest of the link can
1863 understand. */
1864
1865 static bfd_boolean
1866 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1867 struct elf_link_hash_entry *h)
1868 {
1869 struct elf_i386_link_hash_table *htab;
1870 asection *s;
1871
1872 /* STT_GNU_IFUNC symbol must go through PLT. */
1873 if (h->type == STT_GNU_IFUNC)
1874 {
1875 if (h->plt.refcount <= 0)
1876 {
1877 h->plt.offset = (bfd_vma) -1;
1878 h->needs_plt = 0;
1879 }
1880 return TRUE;
1881 }
1882
1883 /* If this is a function, put it in the procedure linkage table. We
1884 will fill in the contents of the procedure linkage table later,
1885 when we know the address of the .got section. */
1886 if (h->type == STT_FUNC
1887 || h->needs_plt)
1888 {
1889 if (h->plt.refcount <= 0
1890 || SYMBOL_CALLS_LOCAL (info, h)
1891 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1892 && h->root.type == bfd_link_hash_undefweak))
1893 {
1894 /* This case can occur if we saw a PLT32 reloc in an input
1895 file, but the symbol was never referred to by a dynamic
1896 object, or if all references were garbage collected. In
1897 such a case, we don't actually need to build a procedure
1898 linkage table, and we can just do a PC32 reloc instead. */
1899 h->plt.offset = (bfd_vma) -1;
1900 h->needs_plt = 0;
1901 }
1902
1903 return TRUE;
1904 }
1905 else
1906 /* It's possible that we incorrectly decided a .plt reloc was
1907 needed for an R_386_PC32 reloc to a non-function sym in
1908 check_relocs. We can't decide accurately between function and
1909 non-function syms in check-relocs; Objects loaded later in
1910 the link may change h->type. So fix it now. */
1911 h->plt.offset = (bfd_vma) -1;
1912
1913 /* If this is a weak symbol, and there is a real definition, the
1914 processor independent code will have arranged for us to see the
1915 real definition first, and we can just use the same value. */
1916 if (h->u.weakdef != NULL)
1917 {
1918 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1919 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1920 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1921 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1922 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1923 h->non_got_ref = h->u.weakdef->non_got_ref;
1924 return TRUE;
1925 }
1926
1927 /* This is a reference to a symbol defined by a dynamic object which
1928 is not a function. */
1929
1930 /* If we are creating a shared library, we must presume that the
1931 only references to the symbol are via the global offset table.
1932 For such cases we need not do anything here; the relocations will
1933 be handled correctly by relocate_section. */
1934 if (info->shared)
1935 return TRUE;
1936
1937 /* If there are no references to this symbol that do not use the
1938 GOT, we don't need to generate a copy reloc. */
1939 if (!h->non_got_ref)
1940 return TRUE;
1941
1942 /* If -z nocopyreloc was given, we won't generate them either. */
1943 if (info->nocopyreloc)
1944 {
1945 h->non_got_ref = 0;
1946 return TRUE;
1947 }
1948
1949 htab = elf_i386_hash_table (info);
1950
1951 /* If there aren't any dynamic relocs in read-only sections, then
1952 we can keep the dynamic relocs and avoid the copy reloc. This
1953 doesn't work on VxWorks, where we can not have dynamic relocations
1954 (other than copy and jump slot relocations) in an executable. */
1955 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1956 {
1957 struct elf_i386_link_hash_entry * eh;
1958 struct elf_dyn_relocs *p;
1959
1960 eh = (struct elf_i386_link_hash_entry *) h;
1961 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1962 {
1963 s = p->sec->output_section;
1964 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1965 break;
1966 }
1967
1968 if (p == NULL)
1969 {
1970 h->non_got_ref = 0;
1971 return TRUE;
1972 }
1973 }
1974
1975 if (h->size == 0)
1976 {
1977 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1978 h->root.root.string);
1979 return TRUE;
1980 }
1981
1982 /* We must allocate the symbol in our .dynbss section, which will
1983 become part of the .bss section of the executable. There will be
1984 an entry for this symbol in the .dynsym section. The dynamic
1985 object will contain position independent code, so all references
1986 from the dynamic object to this symbol will go through the global
1987 offset table. The dynamic linker will use the .dynsym entry to
1988 determine the address it must put in the global offset table, so
1989 both the dynamic object and the regular object will refer to the
1990 same memory location for the variable. */
1991
1992 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1993 copy the initial value out of the dynamic object and into the
1994 runtime process image. */
1995 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1996 {
1997 htab->srelbss->size += sizeof (Elf32_External_Rel);
1998 h->needs_copy = 1;
1999 }
2000
2001 s = htab->sdynbss;
2002
2003 return _bfd_elf_adjust_dynamic_copy (h, s);
2004 }
2005
2006 /* Allocate space in .plt, .got and associated reloc sections for
2007 dynamic relocs. */
2008
2009 static bfd_boolean
2010 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2011 {
2012 struct bfd_link_info *info;
2013 struct elf_i386_link_hash_table *htab;
2014 struct elf_i386_link_hash_entry *eh;
2015 struct elf_dyn_relocs *p;
2016
2017 if (h->root.type == bfd_link_hash_indirect)
2018 return TRUE;
2019
2020 if (h->root.type == bfd_link_hash_warning)
2021 /* When warning symbols are created, they **replace** the "real"
2022 entry in the hash table, thus we never get to see the real
2023 symbol in a hash traversal. So look at it now. */
2024 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2025 eh = (struct elf_i386_link_hash_entry *) h;
2026
2027 info = (struct bfd_link_info *) inf;
2028 htab = elf_i386_hash_table (info);
2029
2030 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2031 here if it is defined and referenced in a non-shared object. */
2032 if (h->type == STT_GNU_IFUNC
2033 && h->def_regular)
2034 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2035 &eh->dyn_relocs,
2036 PLT_ENTRY_SIZE, 4);
2037 else if (htab->elf.dynamic_sections_created
2038 && h->plt.refcount > 0)
2039 {
2040 /* Make sure this symbol is output as a dynamic symbol.
2041 Undefined weak syms won't yet be marked as dynamic. */
2042 if (h->dynindx == -1
2043 && !h->forced_local)
2044 {
2045 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2046 return FALSE;
2047 }
2048
2049 if (info->shared
2050 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2051 {
2052 asection *s = htab->elf.splt;
2053
2054 /* If this is the first .plt entry, make room for the special
2055 first entry. */
2056 if (s->size == 0)
2057 s->size += PLT_ENTRY_SIZE;
2058
2059 h->plt.offset = s->size;
2060
2061 /* If this symbol is not defined in a regular file, and we are
2062 not generating a shared library, then set the symbol to this
2063 location in the .plt. This is required to make function
2064 pointers compare as equal between the normal executable and
2065 the shared library. */
2066 if (! info->shared
2067 && !h->def_regular)
2068 {
2069 h->root.u.def.section = s;
2070 h->root.u.def.value = h->plt.offset;
2071 }
2072
2073 /* Make room for this entry. */
2074 s->size += PLT_ENTRY_SIZE;
2075
2076 /* We also need to make an entry in the .got.plt section, which
2077 will be placed in the .got section by the linker script. */
2078 htab->elf.sgotplt->size += 4;
2079
2080 /* We also need to make an entry in the .rel.plt section. */
2081 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2082 htab->next_tls_desc_index++;
2083
2084 if (htab->is_vxworks && !info->shared)
2085 {
2086 /* VxWorks has a second set of relocations for each PLT entry
2087 in executables. They go in a separate relocation section,
2088 which is processed by the kernel loader. */
2089
2090 /* There are two relocations for the initial PLT entry: an
2091 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2092 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2093
2094 if (h->plt.offset == PLT_ENTRY_SIZE)
2095 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2096
2097 /* There are two extra relocations for each subsequent PLT entry:
2098 an R_386_32 relocation for the GOT entry, and an R_386_32
2099 relocation for the PLT entry. */
2100
2101 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2102 }
2103 }
2104 else
2105 {
2106 h->plt.offset = (bfd_vma) -1;
2107 h->needs_plt = 0;
2108 }
2109 }
2110 else
2111 {
2112 h->plt.offset = (bfd_vma) -1;
2113 h->needs_plt = 0;
2114 }
2115
2116 eh->tlsdesc_got = (bfd_vma) -1;
2117
2118 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2119 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2120 if (h->got.refcount > 0
2121 && info->executable
2122 && h->dynindx == -1
2123 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2124 h->got.offset = (bfd_vma) -1;
2125 else if (h->got.refcount > 0)
2126 {
2127 asection *s;
2128 bfd_boolean dyn;
2129 int tls_type = elf_i386_hash_entry(h)->tls_type;
2130
2131 /* Make sure this symbol is output as a dynamic symbol.
2132 Undefined weak syms won't yet be marked as dynamic. */
2133 if (h->dynindx == -1
2134 && !h->forced_local)
2135 {
2136 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2137 return FALSE;
2138 }
2139
2140 s = htab->elf.sgot;
2141 if (GOT_TLS_GDESC_P (tls_type))
2142 {
2143 eh->tlsdesc_got = htab->elf.sgotplt->size
2144 - elf_i386_compute_jump_table_size (htab);
2145 htab->elf.sgotplt->size += 8;
2146 h->got.offset = (bfd_vma) -2;
2147 }
2148 if (! GOT_TLS_GDESC_P (tls_type)
2149 || GOT_TLS_GD_P (tls_type))
2150 {
2151 h->got.offset = s->size;
2152 s->size += 4;
2153 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2154 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2155 s->size += 4;
2156 }
2157 dyn = htab->elf.dynamic_sections_created;
2158 /* R_386_TLS_IE_32 needs one dynamic relocation,
2159 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2160 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2161 need two), R_386_TLS_GD needs one if local symbol and two if
2162 global. */
2163 if (tls_type == GOT_TLS_IE_BOTH)
2164 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2165 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2166 || (tls_type & GOT_TLS_IE))
2167 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2168 else if (GOT_TLS_GD_P (tls_type))
2169 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2170 else if (! GOT_TLS_GDESC_P (tls_type)
2171 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2172 || h->root.type != bfd_link_hash_undefweak)
2173 && (info->shared
2174 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2175 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2176 if (GOT_TLS_GDESC_P (tls_type))
2177 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2178 }
2179 else
2180 h->got.offset = (bfd_vma) -1;
2181
2182 if (eh->dyn_relocs == NULL)
2183 return TRUE;
2184
2185 /* In the shared -Bsymbolic case, discard space allocated for
2186 dynamic pc-relative relocs against symbols which turn out to be
2187 defined in regular objects. For the normal shared case, discard
2188 space for pc-relative relocs that have become local due to symbol
2189 visibility changes. */
2190
2191 if (info->shared)
2192 {
2193 /* The only reloc that uses pc_count is R_386_PC32, which will
2194 appear on a call or on something like ".long foo - .". We
2195 want calls to protected symbols to resolve directly to the
2196 function rather than going via the plt. If people want
2197 function pointer comparisons to work as expected then they
2198 should avoid writing assembly like ".long foo - .". */
2199 if (SYMBOL_CALLS_LOCAL (info, h))
2200 {
2201 struct elf_dyn_relocs **pp;
2202
2203 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2204 {
2205 p->count -= p->pc_count;
2206 p->pc_count = 0;
2207 if (p->count == 0)
2208 *pp = p->next;
2209 else
2210 pp = &p->next;
2211 }
2212 }
2213
2214 if (htab->is_vxworks)
2215 {
2216 struct elf_dyn_relocs **pp;
2217 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2218 {
2219 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2220 *pp = p->next;
2221 else
2222 pp = &p->next;
2223 }
2224 }
2225
2226 /* Also discard relocs on undefined weak syms with non-default
2227 visibility. */
2228 if (eh->dyn_relocs != NULL
2229 && h->root.type == bfd_link_hash_undefweak)
2230 {
2231 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2232 eh->dyn_relocs = NULL;
2233
2234 /* Make sure undefined weak symbols are output as a dynamic
2235 symbol in PIEs. */
2236 else if (h->dynindx == -1
2237 && !h->forced_local)
2238 {
2239 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2240 return FALSE;
2241 }
2242 }
2243 }
2244 else if (ELIMINATE_COPY_RELOCS)
2245 {
2246 /* For the non-shared case, discard space for relocs against
2247 symbols which turn out to need copy relocs or are not
2248 dynamic. */
2249
2250 if (!h->non_got_ref
2251 && ((h->def_dynamic
2252 && !h->def_regular)
2253 || (htab->elf.dynamic_sections_created
2254 && (h->root.type == bfd_link_hash_undefweak
2255 || h->root.type == bfd_link_hash_undefined))))
2256 {
2257 /* Make sure this symbol is output as a dynamic symbol.
2258 Undefined weak syms won't yet be marked as dynamic. */
2259 if (h->dynindx == -1
2260 && !h->forced_local)
2261 {
2262 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2263 return FALSE;
2264 }
2265
2266 /* If that succeeded, we know we'll be keeping all the
2267 relocs. */
2268 if (h->dynindx != -1)
2269 goto keep;
2270 }
2271
2272 eh->dyn_relocs = NULL;
2273
2274 keep: ;
2275 }
2276
2277 /* Finally, allocate space. */
2278 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2279 {
2280 asection *sreloc;
2281
2282 sreloc = elf_section_data (p->sec)->sreloc;
2283
2284 BFD_ASSERT (sreloc != NULL);
2285 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2286 }
2287
2288 return TRUE;
2289 }
2290
2291 /* Allocate space in .plt, .got and associated reloc sections for
2292 local dynamic relocs. */
2293
2294 static bfd_boolean
2295 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2296 {
2297 struct elf_link_hash_entry *h
2298 = (struct elf_link_hash_entry *) *slot;
2299
2300 if (h->type != STT_GNU_IFUNC
2301 || !h->def_regular
2302 || !h->ref_regular
2303 || !h->forced_local
2304 || h->root.type != bfd_link_hash_defined)
2305 abort ();
2306
2307 return elf_i386_allocate_dynrelocs (h, inf);
2308 }
2309
2310 /* Find any dynamic relocs that apply to read-only sections. */
2311
2312 static bfd_boolean
2313 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2314 {
2315 struct elf_i386_link_hash_entry *eh;
2316 struct elf_dyn_relocs *p;
2317
2318 if (h->root.type == bfd_link_hash_warning)
2319 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2320
2321 eh = (struct elf_i386_link_hash_entry *) h;
2322 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2323 {
2324 asection *s = p->sec->output_section;
2325
2326 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2327 {
2328 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2329
2330 info->flags |= DF_TEXTREL;
2331
2332 /* Not an error, just cut short the traversal. */
2333 return FALSE;
2334 }
2335 }
2336 return TRUE;
2337 }
2338
2339 /* Set the sizes of the dynamic sections. */
2340
2341 static bfd_boolean
2342 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2343 struct bfd_link_info *info)
2344 {
2345 struct elf_i386_link_hash_table *htab;
2346 bfd *dynobj;
2347 asection *s;
2348 bfd_boolean relocs;
2349 bfd *ibfd;
2350
2351 htab = elf_i386_hash_table (info);
2352 dynobj = htab->elf.dynobj;
2353 if (dynobj == NULL)
2354 abort ();
2355
2356 if (htab->elf.dynamic_sections_created)
2357 {
2358 /* Set the contents of the .interp section to the interpreter. */
2359 if (info->executable)
2360 {
2361 s = bfd_get_section_by_name (dynobj, ".interp");
2362 if (s == NULL)
2363 abort ();
2364 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2365 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2366 }
2367 }
2368
2369 /* Set up .got offsets for local syms, and space for local dynamic
2370 relocs. */
2371 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2372 {
2373 bfd_signed_vma *local_got;
2374 bfd_signed_vma *end_local_got;
2375 char *local_tls_type;
2376 bfd_vma *local_tlsdesc_gotent;
2377 bfd_size_type locsymcount;
2378 Elf_Internal_Shdr *symtab_hdr;
2379 asection *srel;
2380
2381 if (! is_i386_elf (ibfd))
2382 continue;
2383
2384 for (s = ibfd->sections; s != NULL; s = s->next)
2385 {
2386 struct elf_dyn_relocs *p;
2387
2388 for (p = ((struct elf_dyn_relocs *)
2389 elf_section_data (s)->local_dynrel);
2390 p != NULL;
2391 p = p->next)
2392 {
2393 if (!bfd_is_abs_section (p->sec)
2394 && bfd_is_abs_section (p->sec->output_section))
2395 {
2396 /* Input section has been discarded, either because
2397 it is a copy of a linkonce section or due to
2398 linker script /DISCARD/, so we'll be discarding
2399 the relocs too. */
2400 }
2401 else if (htab->is_vxworks
2402 && strcmp (p->sec->output_section->name,
2403 ".tls_vars") == 0)
2404 {
2405 /* Relocations in vxworks .tls_vars sections are
2406 handled specially by the loader. */
2407 }
2408 else if (p->count != 0)
2409 {
2410 srel = elf_section_data (p->sec)->sreloc;
2411 srel->size += p->count * sizeof (Elf32_External_Rel);
2412 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2413 info->flags |= DF_TEXTREL;
2414 }
2415 }
2416 }
2417
2418 local_got = elf_local_got_refcounts (ibfd);
2419 if (!local_got)
2420 continue;
2421
2422 symtab_hdr = &elf_symtab_hdr (ibfd);
2423 locsymcount = symtab_hdr->sh_info;
2424 end_local_got = local_got + locsymcount;
2425 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2426 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2427 s = htab->elf.sgot;
2428 srel = htab->elf.srelgot;
2429 for (; local_got < end_local_got;
2430 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2431 {
2432 *local_tlsdesc_gotent = (bfd_vma) -1;
2433 if (*local_got > 0)
2434 {
2435 if (GOT_TLS_GDESC_P (*local_tls_type))
2436 {
2437 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2438 - elf_i386_compute_jump_table_size (htab);
2439 htab->elf.sgotplt->size += 8;
2440 *local_got = (bfd_vma) -2;
2441 }
2442 if (! GOT_TLS_GDESC_P (*local_tls_type)
2443 || GOT_TLS_GD_P (*local_tls_type))
2444 {
2445 *local_got = s->size;
2446 s->size += 4;
2447 if (GOT_TLS_GD_P (*local_tls_type)
2448 || *local_tls_type == GOT_TLS_IE_BOTH)
2449 s->size += 4;
2450 }
2451 if (info->shared
2452 || GOT_TLS_GD_ANY_P (*local_tls_type)
2453 || (*local_tls_type & GOT_TLS_IE))
2454 {
2455 if (*local_tls_type == GOT_TLS_IE_BOTH)
2456 srel->size += 2 * sizeof (Elf32_External_Rel);
2457 else if (GOT_TLS_GD_P (*local_tls_type)
2458 || ! GOT_TLS_GDESC_P (*local_tls_type))
2459 srel->size += sizeof (Elf32_External_Rel);
2460 if (GOT_TLS_GDESC_P (*local_tls_type))
2461 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2462 }
2463 }
2464 else
2465 *local_got = (bfd_vma) -1;
2466 }
2467 }
2468
2469 if (htab->tls_ldm_got.refcount > 0)
2470 {
2471 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2472 relocs. */
2473 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2474 htab->elf.sgot->size += 8;
2475 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2476 }
2477 else
2478 htab->tls_ldm_got.offset = -1;
2479
2480 /* Allocate global sym .plt and .got entries, and space for global
2481 sym dynamic relocs. */
2482 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2483
2484 /* Allocate .plt and .got entries, and space for local symbols. */
2485 htab_traverse (htab->loc_hash_table,
2486 elf_i386_allocate_local_dynrelocs,
2487 info);
2488
2489 /* For every jump slot reserved in the sgotplt, reloc_count is
2490 incremented. However, when we reserve space for TLS descriptors,
2491 it's not incremented, so in order to compute the space reserved
2492 for them, it suffices to multiply the reloc count by the jump
2493 slot size. */
2494 if (htab->elf.srelplt)
2495 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2496
2497 /* We now have determined the sizes of the various dynamic sections.
2498 Allocate memory for them. */
2499 relocs = FALSE;
2500 for (s = dynobj->sections; s != NULL; s = s->next)
2501 {
2502 bfd_boolean strip_section = TRUE;
2503
2504 if ((s->flags & SEC_LINKER_CREATED) == 0)
2505 continue;
2506
2507 if (s == htab->elf.splt
2508 || s == htab->elf.sgot
2509 || s == htab->elf.sgotplt
2510 || s == htab->elf.iplt
2511 || s == htab->elf.igotplt
2512 || s == htab->sdynbss)
2513 {
2514 /* Strip this section if we don't need it; see the
2515 comment below. */
2516 /* We'd like to strip these sections if they aren't needed, but if
2517 we've exported dynamic symbols from them we must leave them.
2518 It's too late to tell BFD to get rid of the symbols. */
2519
2520 if (htab->elf.hplt != NULL)
2521 strip_section = FALSE;
2522 }
2523 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2524 {
2525 if (s->size != 0
2526 && s != htab->elf.srelplt
2527 && s != htab->srelplt2)
2528 relocs = TRUE;
2529
2530 /* We use the reloc_count field as a counter if we need
2531 to copy relocs into the output file. */
2532 s->reloc_count = 0;
2533 }
2534 else
2535 {
2536 /* It's not one of our sections, so don't allocate space. */
2537 continue;
2538 }
2539
2540 if (s->size == 0)
2541 {
2542 /* If we don't need this section, strip it from the
2543 output file. This is mostly to handle .rel.bss and
2544 .rel.plt. We must create both sections in
2545 create_dynamic_sections, because they must be created
2546 before the linker maps input sections to output
2547 sections. The linker does that before
2548 adjust_dynamic_symbol is called, and it is that
2549 function which decides whether anything needs to go
2550 into these sections. */
2551 if (strip_section)
2552 s->flags |= SEC_EXCLUDE;
2553 continue;
2554 }
2555
2556 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2557 continue;
2558
2559 /* Allocate memory for the section contents. We use bfd_zalloc
2560 here in case unused entries are not reclaimed before the
2561 section's contents are written out. This should not happen,
2562 but this way if it does, we get a R_386_NONE reloc instead
2563 of garbage. */
2564 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2565 if (s->contents == NULL)
2566 return FALSE;
2567 }
2568
2569 if (htab->elf.dynamic_sections_created)
2570 {
2571 /* Add some entries to the .dynamic section. We fill in the
2572 values later, in elf_i386_finish_dynamic_sections, but we
2573 must add the entries now so that we get the correct size for
2574 the .dynamic section. The DT_DEBUG entry is filled in by the
2575 dynamic linker and used by the debugger. */
2576 #define add_dynamic_entry(TAG, VAL) \
2577 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2578
2579 if (info->executable)
2580 {
2581 if (!add_dynamic_entry (DT_DEBUG, 0))
2582 return FALSE;
2583 }
2584
2585 if (htab->elf.splt->size != 0)
2586 {
2587 if (!add_dynamic_entry (DT_PLTGOT, 0)
2588 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2589 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2590 || !add_dynamic_entry (DT_JMPREL, 0))
2591 return FALSE;
2592 }
2593
2594 if (relocs)
2595 {
2596 if (!add_dynamic_entry (DT_REL, 0)
2597 || !add_dynamic_entry (DT_RELSZ, 0)
2598 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2599 return FALSE;
2600
2601 /* If any dynamic relocs apply to a read-only section,
2602 then we need a DT_TEXTREL entry. */
2603 if ((info->flags & DF_TEXTREL) == 0)
2604 elf_link_hash_traverse (&htab->elf,
2605 elf_i386_readonly_dynrelocs, info);
2606
2607 if ((info->flags & DF_TEXTREL) != 0)
2608 {
2609 if (!add_dynamic_entry (DT_TEXTREL, 0))
2610 return FALSE;
2611 }
2612 }
2613 if (htab->is_vxworks
2614 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2615 return FALSE;
2616 }
2617 #undef add_dynamic_entry
2618
2619 return TRUE;
2620 }
2621
2622 static bfd_boolean
2623 elf_i386_always_size_sections (bfd *output_bfd,
2624 struct bfd_link_info *info)
2625 {
2626 asection *tls_sec = elf_hash_table (info)->tls_sec;
2627
2628 if (tls_sec)
2629 {
2630 struct elf_link_hash_entry *tlsbase;
2631
2632 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2633 "_TLS_MODULE_BASE_",
2634 FALSE, FALSE, FALSE);
2635
2636 if (tlsbase && tlsbase->type == STT_TLS)
2637 {
2638 struct bfd_link_hash_entry *bh = NULL;
2639 const struct elf_backend_data *bed
2640 = get_elf_backend_data (output_bfd);
2641
2642 if (!(_bfd_generic_link_add_one_symbol
2643 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2644 tls_sec, 0, NULL, FALSE,
2645 bed->collect, &bh)))
2646 return FALSE;
2647
2648 elf_i386_hash_table (info)->tls_module_base = bh;
2649
2650 tlsbase = (struct elf_link_hash_entry *)bh;
2651 tlsbase->def_regular = 1;
2652 tlsbase->other = STV_HIDDEN;
2653 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2654 }
2655 }
2656
2657 return TRUE;
2658 }
2659
2660 /* Set the correct type for an x86 ELF section. We do this by the
2661 section name, which is a hack, but ought to work. */
2662
2663 static bfd_boolean
2664 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2665 Elf_Internal_Shdr *hdr,
2666 asection *sec)
2667 {
2668 register const char *name;
2669
2670 name = bfd_get_section_name (abfd, sec);
2671
2672 /* This is an ugly, but unfortunately necessary hack that is
2673 needed when producing EFI binaries on x86. It tells
2674 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2675 containing ELF relocation info. We need this hack in order to
2676 be able to generate ELF binaries that can be translated into
2677 EFI applications (which are essentially COFF objects). Those
2678 files contain a COFF ".reloc" section inside an ELFNN object,
2679 which would normally cause BFD to segfault because it would
2680 attempt to interpret this section as containing relocation
2681 entries for section "oc". With this hack enabled, ".reloc"
2682 will be treated as a normal data section, which will avoid the
2683 segfault. However, you won't be able to create an ELFNN binary
2684 with a section named "oc" that needs relocations, but that's
2685 the kind of ugly side-effects you get when detecting section
2686 types based on their names... In practice, this limitation is
2687 unlikely to bite. */
2688 if (strcmp (name, ".reloc") == 0)
2689 hdr->sh_type = SHT_PROGBITS;
2690
2691 return TRUE;
2692 }
2693
2694 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2695 executables. Rather than setting it to the beginning of the TLS
2696 section, we have to set it to the end. This function may be called
2697 multiple times, it is idempotent. */
2698
2699 static void
2700 elf_i386_set_tls_module_base (struct bfd_link_info *info)
2701 {
2702 struct bfd_link_hash_entry *base;
2703
2704 if (!info->executable)
2705 return;
2706
2707 base = elf_i386_hash_table (info)->tls_module_base;
2708
2709 if (!base)
2710 return;
2711
2712 base->u.def.value = elf_hash_table (info)->tls_size;
2713 }
2714
2715 /* Return the base VMA address which should be subtracted from real addresses
2716 when resolving @dtpoff relocation.
2717 This is PT_TLS segment p_vaddr. */
2718
2719 static bfd_vma
2720 elf_i386_dtpoff_base (struct bfd_link_info *info)
2721 {
2722 /* If tls_sec is NULL, we should have signalled an error already. */
2723 if (elf_hash_table (info)->tls_sec == NULL)
2724 return 0;
2725 return elf_hash_table (info)->tls_sec->vma;
2726 }
2727
2728 /* Return the relocation value for @tpoff relocation
2729 if STT_TLS virtual address is ADDRESS. */
2730
2731 static bfd_vma
2732 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2733 {
2734 struct elf_link_hash_table *htab = elf_hash_table (info);
2735
2736 /* If tls_sec is NULL, we should have signalled an error already. */
2737 if (htab->tls_sec == NULL)
2738 return 0;
2739 return htab->tls_size + htab->tls_sec->vma - address;
2740 }
2741
2742 /* Relocate an i386 ELF section. */
2743
2744 static bfd_boolean
2745 elf_i386_relocate_section (bfd *output_bfd,
2746 struct bfd_link_info *info,
2747 bfd *input_bfd,
2748 asection *input_section,
2749 bfd_byte *contents,
2750 Elf_Internal_Rela *relocs,
2751 Elf_Internal_Sym *local_syms,
2752 asection **local_sections)
2753 {
2754 struct elf_i386_link_hash_table *htab;
2755 Elf_Internal_Shdr *symtab_hdr;
2756 struct elf_link_hash_entry **sym_hashes;
2757 bfd_vma *local_got_offsets;
2758 bfd_vma *local_tlsdesc_gotents;
2759 Elf_Internal_Rela *rel;
2760 Elf_Internal_Rela *relend;
2761 bfd_boolean is_vxworks_tls;
2762
2763 BFD_ASSERT (is_i386_elf (input_bfd));
2764
2765 htab = elf_i386_hash_table (info);
2766 symtab_hdr = &elf_symtab_hdr (input_bfd);
2767 sym_hashes = elf_sym_hashes (input_bfd);
2768 local_got_offsets = elf_local_got_offsets (input_bfd);
2769 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2770 /* We have to handle relocations in vxworks .tls_vars sections
2771 specially, because the dynamic loader is 'weird'. */
2772 is_vxworks_tls = (htab->is_vxworks && info->shared
2773 && !strcmp (input_section->output_section->name,
2774 ".tls_vars"));
2775
2776 elf_i386_set_tls_module_base (info);
2777
2778 rel = relocs;
2779 relend = relocs + input_section->reloc_count;
2780 for (; rel < relend; rel++)
2781 {
2782 unsigned int r_type;
2783 reloc_howto_type *howto;
2784 unsigned long r_symndx;
2785 struct elf_link_hash_entry *h;
2786 Elf_Internal_Sym *sym;
2787 asection *sec;
2788 bfd_vma off, offplt;
2789 bfd_vma relocation;
2790 bfd_boolean unresolved_reloc;
2791 bfd_reloc_status_type r;
2792 unsigned int indx;
2793 int tls_type;
2794
2795 r_type = ELF32_R_TYPE (rel->r_info);
2796 if (r_type == R_386_GNU_VTINHERIT
2797 || r_type == R_386_GNU_VTENTRY)
2798 continue;
2799
2800 if ((indx = r_type) >= R_386_standard
2801 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2802 >= R_386_ext - R_386_standard)
2803 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2804 >= R_386_irelative - R_386_ext))
2805 {
2806 (*_bfd_error_handler)
2807 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2808 input_bfd, input_section, r_type);
2809 bfd_set_error (bfd_error_bad_value);
2810 return FALSE;
2811 }
2812 howto = elf_howto_table + indx;
2813
2814 r_symndx = ELF32_R_SYM (rel->r_info);
2815 h = NULL;
2816 sym = NULL;
2817 sec = NULL;
2818 unresolved_reloc = FALSE;
2819 if (r_symndx < symtab_hdr->sh_info)
2820 {
2821 sym = local_syms + r_symndx;
2822 sec = local_sections[r_symndx];
2823 relocation = (sec->output_section->vma
2824 + sec->output_offset
2825 + sym->st_value);
2826
2827 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2828 && ((sec->flags & SEC_MERGE) != 0
2829 || (info->relocatable
2830 && sec->output_offset != 0)))
2831 {
2832 bfd_vma addend;
2833 bfd_byte *where = contents + rel->r_offset;
2834
2835 switch (howto->size)
2836 {
2837 case 0:
2838 addend = bfd_get_8 (input_bfd, where);
2839 if (howto->pc_relative)
2840 {
2841 addend = (addend ^ 0x80) - 0x80;
2842 addend += 1;
2843 }
2844 break;
2845 case 1:
2846 addend = bfd_get_16 (input_bfd, where);
2847 if (howto->pc_relative)
2848 {
2849 addend = (addend ^ 0x8000) - 0x8000;
2850 addend += 2;
2851 }
2852 break;
2853 case 2:
2854 addend = bfd_get_32 (input_bfd, where);
2855 if (howto->pc_relative)
2856 {
2857 addend = (addend ^ 0x80000000) - 0x80000000;
2858 addend += 4;
2859 }
2860 break;
2861 default:
2862 abort ();
2863 }
2864
2865 if (info->relocatable)
2866 addend += sec->output_offset;
2867 else
2868 {
2869 asection *msec = sec;
2870 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2871 addend);
2872 addend -= relocation;
2873 addend += msec->output_section->vma + msec->output_offset;
2874 }
2875
2876 switch (howto->size)
2877 {
2878 case 0:
2879 /* FIXME: overflow checks. */
2880 if (howto->pc_relative)
2881 addend -= 1;
2882 bfd_put_8 (input_bfd, addend, where);
2883 break;
2884 case 1:
2885 if (howto->pc_relative)
2886 addend -= 2;
2887 bfd_put_16 (input_bfd, addend, where);
2888 break;
2889 case 2:
2890 if (howto->pc_relative)
2891 addend -= 4;
2892 bfd_put_32 (input_bfd, addend, where);
2893 break;
2894 }
2895 }
2896 else if (!info->relocatable
2897 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2898 {
2899 /* Relocate against local STT_GNU_IFUNC symbol. */
2900 h = elf_i386_get_local_sym_hash (htab, input_bfd,
2901 rel, FALSE);
2902 if (h == NULL)
2903 abort ();
2904
2905 /* Set STT_GNU_IFUNC symbol value. */
2906 h->root.u.def.value = sym->st_value;
2907 h->root.u.def.section = sec;
2908 }
2909 }
2910 else
2911 {
2912 bfd_boolean warned;
2913
2914 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2915 r_symndx, symtab_hdr, sym_hashes,
2916 h, sec, relocation,
2917 unresolved_reloc, warned);
2918 }
2919
2920 if (sec != NULL && elf_discarded_section (sec))
2921 {
2922 /* For relocs against symbols from removed linkonce sections,
2923 or sections discarded by a linker script, we just want the
2924 section contents zeroed. Avoid any special processing. */
2925 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2926 rel->r_info = 0;
2927 rel->r_addend = 0;
2928 continue;
2929 }
2930
2931 if (info->relocatable)
2932 continue;
2933
2934 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2935 it here if it is defined in a non-shared object. */
2936 if (h != NULL
2937 && h->type == STT_GNU_IFUNC
2938 && h->def_regular)
2939 {
2940 asection *plt, *gotplt, *base_got;
2941 bfd_vma plt_index;
2942 const char *name;
2943
2944 if ((input_section->flags & SEC_ALLOC) == 0
2945 || h->plt.offset == (bfd_vma) -1)
2946 abort ();
2947
2948 /* STT_GNU_IFUNC symbol must go through PLT. */
2949 if (htab->elf.splt != NULL)
2950 {
2951 plt = htab->elf.splt;
2952 gotplt = htab->elf.sgotplt;
2953 }
2954 else
2955 {
2956 plt = htab->elf.iplt;
2957 gotplt = htab->elf.igotplt;
2958 }
2959
2960 relocation = (plt->output_section->vma
2961 + plt->output_offset + h->plt.offset);
2962
2963 switch (r_type)
2964 {
2965 default:
2966 if (h->root.root.string)
2967 name = h->root.root.string;
2968 else
2969 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2970 NULL);
2971 (*_bfd_error_handler)
2972 (_("%B: relocation %s against STT_GNU_IFUNC "
2973 "symbol `%s' isn't handled by %s"), input_bfd,
2974 elf_howto_table[r_type].name,
2975 name, __FUNCTION__);
2976 bfd_set_error (bfd_error_bad_value);
2977 return FALSE;
2978
2979 case R_386_32:
2980 /* Generate dynamic relcoation only when there is a
2981 non-GOF reference in a shared object. */
2982 if (info->shared && h->non_got_ref)
2983 {
2984 Elf_Internal_Rela outrel;
2985 bfd_byte *loc;
2986 asection *sreloc;
2987 bfd_vma offset;
2988
2989 /* Need a dynamic relocation to get the real function
2990 adddress. */
2991 offset = _bfd_elf_section_offset (output_bfd,
2992 info,
2993 input_section,
2994 rel->r_offset);
2995 if (offset == (bfd_vma) -1
2996 || offset == (bfd_vma) -2)
2997 abort ();
2998
2999 outrel.r_offset = (input_section->output_section->vma
3000 + input_section->output_offset
3001 + offset);
3002
3003 if (h->dynindx == -1
3004 || h->forced_local
3005 || info->executable)
3006 {
3007 /* This symbol is resolved locally. */
3008 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3009 bfd_put_32 (output_bfd,
3010 (h->root.u.def.value
3011 + h->root.u.def.section->output_section->vma
3012 + h->root.u.def.section->output_offset),
3013 contents + offset);
3014 }
3015 else
3016 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3017
3018 sreloc = htab->elf.irelifunc;
3019 loc = sreloc->contents;
3020 loc += (sreloc->reloc_count++
3021 * sizeof (Elf32_External_Rel));
3022 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3023
3024 /* If this reloc is against an external symbol, we
3025 do not want to fiddle with the addend. Otherwise,
3026 we need to include the symbol value so that it
3027 becomes an addend for the dynamic reloc. For an
3028 internal symbol, we have updated addend. */
3029 continue;
3030 }
3031
3032 case R_386_PC32:
3033 case R_386_PLT32:
3034 goto do_relocation;
3035
3036 case R_386_GOT32:
3037 base_got = htab->elf.sgot;
3038 off = h->got.offset;
3039
3040 if (base_got == NULL)
3041 abort ();
3042
3043 if (off == (bfd_vma) -1)
3044 {
3045 /* We can't use h->got.offset here to save state, or
3046 even just remember the offset, as finish_dynamic_symbol
3047 would use that as offset into .got. */
3048
3049 if (htab->elf.splt != NULL)
3050 {
3051 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3052 off = (plt_index + 3) * 4;
3053 base_got = htab->elf.sgotplt;
3054 }
3055 else
3056 {
3057 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3058 off = plt_index * 4;
3059 base_got = htab->elf.igotplt;
3060 }
3061
3062 if (h->dynindx == -1
3063 || h->forced_local
3064 || info->symbolic)
3065 {
3066 /* This references the local defitionion. We must
3067 initialize this entry in the global offset table.
3068 Since the offset must always be a multiple of 8,
3069 we use the least significant bit to record
3070 whether we have initialized it already.
3071
3072 When doing a dynamic link, we create a .rela.got
3073 relocation entry to initialize the value. This
3074 is done in the finish_dynamic_symbol routine. */
3075 if ((off & 1) != 0)
3076 off &= ~1;
3077 else
3078 {
3079 bfd_put_32 (output_bfd, relocation,
3080 base_got->contents + off);
3081 h->got.offset |= 1;
3082 }
3083 }
3084
3085 relocation = off;
3086
3087 /* Adjust for static executables. */
3088 if (htab->elf.splt == NULL)
3089 relocation += gotplt->output_offset;
3090 }
3091 else
3092 {
3093 relocation = (base_got->output_section->vma
3094 + base_got->output_offset + off
3095 - gotplt->output_section->vma
3096 - gotplt->output_offset);
3097 /* Adjust for static executables. */
3098 if (htab->elf.splt == NULL)
3099 relocation += gotplt->output_offset;
3100 }
3101
3102 goto do_relocation;
3103
3104 case R_386_GOTOFF:
3105 relocation -= (gotplt->output_section->vma
3106 + gotplt->output_offset);
3107 goto do_relocation;
3108 }
3109 }
3110
3111 switch (r_type)
3112 {
3113 case R_386_GOT32:
3114 /* Relocation is to the entry for this symbol in the global
3115 offset table. */
3116 if (htab->elf.sgot == NULL)
3117 abort ();
3118
3119 if (h != NULL)
3120 {
3121 bfd_boolean dyn;
3122
3123 off = h->got.offset;
3124 dyn = htab->elf.dynamic_sections_created;
3125 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3126 || (info->shared
3127 && SYMBOL_REFERENCES_LOCAL (info, h))
3128 || (ELF_ST_VISIBILITY (h->other)
3129 && h->root.type == bfd_link_hash_undefweak))
3130 {
3131 /* This is actually a static link, or it is a
3132 -Bsymbolic link and the symbol is defined
3133 locally, or the symbol was forced to be local
3134 because of a version file. We must initialize
3135 this entry in the global offset table. Since the
3136 offset must always be a multiple of 4, we use the
3137 least significant bit to record whether we have
3138 initialized it already.
3139
3140 When doing a dynamic link, we create a .rel.got
3141 relocation entry to initialize the value. This
3142 is done in the finish_dynamic_symbol routine. */
3143 if ((off & 1) != 0)
3144 off &= ~1;
3145 else
3146 {
3147 bfd_put_32 (output_bfd, relocation,
3148 htab->elf.sgot->contents + off);
3149 h->got.offset |= 1;
3150 }
3151 }
3152 else
3153 unresolved_reloc = FALSE;
3154 }
3155 else
3156 {
3157 if (local_got_offsets == NULL)
3158 abort ();
3159
3160 off = local_got_offsets[r_symndx];
3161
3162 /* The offset must always be a multiple of 4. We use
3163 the least significant bit to record whether we have
3164 already generated the necessary reloc. */
3165 if ((off & 1) != 0)
3166 off &= ~1;
3167 else
3168 {
3169 bfd_put_32 (output_bfd, relocation,
3170 htab->elf.sgot->contents + off);
3171
3172 if (info->shared)
3173 {
3174 asection *s;
3175 Elf_Internal_Rela outrel;
3176 bfd_byte *loc;
3177
3178 s = htab->elf.srelgot;
3179 if (s == NULL)
3180 abort ();
3181
3182 outrel.r_offset = (htab->elf.sgot->output_section->vma
3183 + htab->elf.sgot->output_offset
3184 + off);
3185 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3186 loc = s->contents;
3187 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3188 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3189 }
3190
3191 local_got_offsets[r_symndx] |= 1;
3192 }
3193 }
3194
3195 if (off >= (bfd_vma) -2)
3196 abort ();
3197
3198 relocation = htab->elf.sgot->output_section->vma
3199 + htab->elf.sgot->output_offset + off
3200 - htab->elf.sgotplt->output_section->vma
3201 - htab->elf.sgotplt->output_offset;
3202 break;
3203
3204 case R_386_GOTOFF:
3205 /* Relocation is relative to the start of the global offset
3206 table. */
3207
3208 /* Check to make sure it isn't a protected function symbol
3209 for shared library since it may not be local when used
3210 as function address. We also need to make sure that a
3211 symbol is defined locally. */
3212 if (info->shared && h)
3213 {
3214 if (!h->def_regular)
3215 {
3216 const char *v;
3217
3218 switch (ELF_ST_VISIBILITY (h->other))
3219 {
3220 case STV_HIDDEN:
3221 v = _("hidden symbol");
3222 break;
3223 case STV_INTERNAL:
3224 v = _("internal symbol");
3225 break;
3226 case STV_PROTECTED:
3227 v = _("protected symbol");
3228 break;
3229 default:
3230 v = _("symbol");
3231 break;
3232 }
3233
3234 (*_bfd_error_handler)
3235 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3236 input_bfd, v, h->root.root.string);
3237 bfd_set_error (bfd_error_bad_value);
3238 return FALSE;
3239 }
3240 else if (!info->executable
3241 && h->type == STT_FUNC
3242 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3243 {
3244 (*_bfd_error_handler)
3245 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3246 input_bfd, h->root.root.string);
3247 bfd_set_error (bfd_error_bad_value);
3248 return FALSE;
3249 }
3250 }
3251
3252 /* Note that sgot is not involved in this
3253 calculation. We always want the start of .got.plt. If we
3254 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3255 permitted by the ABI, we might have to change this
3256 calculation. */
3257 relocation -= htab->elf.sgotplt->output_section->vma
3258 + htab->elf.sgotplt->output_offset;
3259 break;
3260
3261 case R_386_GOTPC:
3262 /* Use global offset table as symbol value. */
3263 relocation = htab->elf.sgotplt->output_section->vma
3264 + htab->elf.sgotplt->output_offset;
3265 unresolved_reloc = FALSE;
3266 break;
3267
3268 case R_386_PLT32:
3269 /* Relocation is to the entry for this symbol in the
3270 procedure linkage table. */
3271
3272 /* Resolve a PLT32 reloc against a local symbol directly,
3273 without using the procedure linkage table. */
3274 if (h == NULL)
3275 break;
3276
3277 if (h->plt.offset == (bfd_vma) -1
3278 || htab->elf.splt == NULL)
3279 {
3280 /* We didn't make a PLT entry for this symbol. This
3281 happens when statically linking PIC code, or when
3282 using -Bsymbolic. */
3283 break;
3284 }
3285
3286 relocation = (htab->elf.splt->output_section->vma
3287 + htab->elf.splt->output_offset
3288 + h->plt.offset);
3289 unresolved_reloc = FALSE;
3290 break;
3291
3292 case R_386_32:
3293 case R_386_PC32:
3294 if ((input_section->flags & SEC_ALLOC) == 0
3295 || is_vxworks_tls)
3296 break;
3297
3298 if ((info->shared
3299 && (h == NULL
3300 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3301 || h->root.type != bfd_link_hash_undefweak)
3302 && (r_type != R_386_PC32
3303 || !SYMBOL_CALLS_LOCAL (info, h)))
3304 || (ELIMINATE_COPY_RELOCS
3305 && !info->shared
3306 && h != NULL
3307 && h->dynindx != -1
3308 && !h->non_got_ref
3309 && ((h->def_dynamic
3310 && !h->def_regular)
3311 || h->root.type == bfd_link_hash_undefweak
3312 || h->root.type == bfd_link_hash_undefined)))
3313 {
3314 Elf_Internal_Rela outrel;
3315 bfd_byte *loc;
3316 bfd_boolean skip, relocate;
3317 asection *sreloc;
3318
3319 /* When generating a shared object, these relocations
3320 are copied into the output file to be resolved at run
3321 time. */
3322
3323 skip = FALSE;
3324 relocate = FALSE;
3325
3326 outrel.r_offset =
3327 _bfd_elf_section_offset (output_bfd, info, input_section,
3328 rel->r_offset);
3329 if (outrel.r_offset == (bfd_vma) -1)
3330 skip = TRUE;
3331 else if (outrel.r_offset == (bfd_vma) -2)
3332 skip = TRUE, relocate = TRUE;
3333 outrel.r_offset += (input_section->output_section->vma
3334 + input_section->output_offset);
3335
3336 if (skip)
3337 memset (&outrel, 0, sizeof outrel);
3338 else if (h != NULL
3339 && h->dynindx != -1
3340 && (r_type == R_386_PC32
3341 || !info->shared
3342 || !SYMBOLIC_BIND (info, h)
3343 || !h->def_regular))
3344 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3345 else
3346 {
3347 /* This symbol is local, or marked to become local. */
3348 relocate = TRUE;
3349 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3350 }
3351
3352 sreloc = elf_section_data (input_section)->sreloc;
3353
3354 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3355
3356 loc = sreloc->contents;
3357 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3358
3359 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3360
3361 /* If this reloc is against an external symbol, we do
3362 not want to fiddle with the addend. Otherwise, we
3363 need to include the symbol value so that it becomes
3364 an addend for the dynamic reloc. */
3365 if (! relocate)
3366 continue;
3367 }
3368 break;
3369
3370 case R_386_TLS_IE:
3371 if (!info->executable)
3372 {
3373 Elf_Internal_Rela outrel;
3374 bfd_byte *loc;
3375 asection *sreloc;
3376
3377 outrel.r_offset = rel->r_offset
3378 + input_section->output_section->vma
3379 + input_section->output_offset;
3380 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3381 sreloc = elf_section_data (input_section)->sreloc;
3382 if (sreloc == NULL)
3383 abort ();
3384 loc = sreloc->contents;
3385 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3386 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3387 }
3388 /* Fall through */
3389
3390 case R_386_TLS_GD:
3391 case R_386_TLS_GOTDESC:
3392 case R_386_TLS_DESC_CALL:
3393 case R_386_TLS_IE_32:
3394 case R_386_TLS_GOTIE:
3395 tls_type = GOT_UNKNOWN;
3396 if (h == NULL && local_got_offsets)
3397 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3398 else if (h != NULL)
3399 tls_type = elf_i386_hash_entry(h)->tls_type;
3400 if (tls_type == GOT_TLS_IE)
3401 tls_type = GOT_TLS_IE_NEG;
3402
3403 if (! elf_i386_tls_transition (info, input_bfd,
3404 input_section, contents,
3405 symtab_hdr, sym_hashes,
3406 &r_type, tls_type, rel,
3407 relend, h, r_symndx))
3408 return FALSE;
3409
3410 if (r_type == R_386_TLS_LE_32)
3411 {
3412 BFD_ASSERT (! unresolved_reloc);
3413 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3414 {
3415 unsigned int type;
3416 bfd_vma roff;
3417
3418 /* GD->LE transition. */
3419 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3420 if (type == 0x04)
3421 {
3422 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3423 Change it into:
3424 movl %gs:0, %eax; subl $foo@tpoff, %eax
3425 (6 byte form of subl). */
3426 memcpy (contents + rel->r_offset - 3,
3427 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3428 roff = rel->r_offset + 5;
3429 }
3430 else
3431 {
3432 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3433 Change it into:
3434 movl %gs:0, %eax; subl $foo@tpoff, %eax
3435 (6 byte form of subl). */
3436 memcpy (contents + rel->r_offset - 2,
3437 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3438 roff = rel->r_offset + 6;
3439 }
3440 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3441 contents + roff);
3442 /* Skip R_386_PC32/R_386_PLT32. */
3443 rel++;
3444 continue;
3445 }
3446 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3447 {
3448 /* GDesc -> LE transition.
3449 It's originally something like:
3450 leal x@tlsdesc(%ebx), %eax
3451
3452 leal x@ntpoff, %eax
3453
3454 Registers other than %eax may be set up here. */
3455
3456 unsigned int val;
3457 bfd_vma roff;
3458
3459 roff = rel->r_offset;
3460 val = bfd_get_8 (input_bfd, contents + roff - 1);
3461
3462 /* Now modify the instruction as appropriate. */
3463 /* aoliva FIXME: remove the above and xor the byte
3464 below with 0x86. */
3465 bfd_put_8 (output_bfd, val ^ 0x86,
3466 contents + roff - 1);
3467 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3468 contents + roff);
3469 continue;
3470 }
3471 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3472 {
3473 /* GDesc -> LE transition.
3474 It's originally:
3475 call *(%eax)
3476 Turn it into:
3477 xchg %ax,%ax */
3478
3479 bfd_vma roff;
3480
3481 roff = rel->r_offset;
3482 bfd_put_8 (output_bfd, 0x66, contents + roff);
3483 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3484 continue;
3485 }
3486 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3487 {
3488 unsigned int val;
3489
3490 /* IE->LE transition:
3491 Originally it can be one of:
3492 movl foo, %eax
3493 movl foo, %reg
3494 addl foo, %reg
3495 We change it into:
3496 movl $foo, %eax
3497 movl $foo, %reg
3498 addl $foo, %reg. */
3499 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3500 if (val == 0xa1)
3501 {
3502 /* movl foo, %eax. */
3503 bfd_put_8 (output_bfd, 0xb8,
3504 contents + rel->r_offset - 1);
3505 }
3506 else
3507 {
3508 unsigned int type;
3509
3510 type = bfd_get_8 (input_bfd,
3511 contents + rel->r_offset - 2);
3512 switch (type)
3513 {
3514 case 0x8b:
3515 /* movl */
3516 bfd_put_8 (output_bfd, 0xc7,
3517 contents + rel->r_offset - 2);
3518 bfd_put_8 (output_bfd,
3519 0xc0 | ((val >> 3) & 7),
3520 contents + rel->r_offset - 1);
3521 break;
3522 case 0x03:
3523 /* addl */
3524 bfd_put_8 (output_bfd, 0x81,
3525 contents + rel->r_offset - 2);
3526 bfd_put_8 (output_bfd,
3527 0xc0 | ((val >> 3) & 7),
3528 contents + rel->r_offset - 1);
3529 break;
3530 default:
3531 BFD_FAIL ();
3532 break;
3533 }
3534 }
3535 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3536 contents + rel->r_offset);
3537 continue;
3538 }
3539 else
3540 {
3541 unsigned int val, type;
3542
3543 /* {IE_32,GOTIE}->LE transition:
3544 Originally it can be one of:
3545 subl foo(%reg1), %reg2
3546 movl foo(%reg1), %reg2
3547 addl foo(%reg1), %reg2
3548 We change it into:
3549 subl $foo, %reg2
3550 movl $foo, %reg2 (6 byte form)
3551 addl $foo, %reg2. */
3552 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3553 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3554 if (type == 0x8b)
3555 {
3556 /* movl */
3557 bfd_put_8 (output_bfd, 0xc7,
3558 contents + rel->r_offset - 2);
3559 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3560 contents + rel->r_offset - 1);
3561 }
3562 else if (type == 0x2b)
3563 {
3564 /* subl */
3565 bfd_put_8 (output_bfd, 0x81,
3566 contents + rel->r_offset - 2);
3567 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3568 contents + rel->r_offset - 1);
3569 }
3570 else if (type == 0x03)
3571 {
3572 /* addl */
3573 bfd_put_8 (output_bfd, 0x81,
3574 contents + rel->r_offset - 2);
3575 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3576 contents + rel->r_offset - 1);
3577 }
3578 else
3579 BFD_FAIL ();
3580 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3581 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3582 contents + rel->r_offset);
3583 else
3584 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3585 contents + rel->r_offset);
3586 continue;
3587 }
3588 }
3589
3590 if (htab->elf.sgot == NULL)
3591 abort ();
3592
3593 if (h != NULL)
3594 {
3595 off = h->got.offset;
3596 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3597 }
3598 else
3599 {
3600 if (local_got_offsets == NULL)
3601 abort ();
3602
3603 off = local_got_offsets[r_symndx];
3604 offplt = local_tlsdesc_gotents[r_symndx];
3605 }
3606
3607 if ((off & 1) != 0)
3608 off &= ~1;
3609 else
3610 {
3611 Elf_Internal_Rela outrel;
3612 bfd_byte *loc;
3613 int dr_type, indx;
3614 asection *sreloc;
3615
3616 if (htab->elf.srelgot == NULL)
3617 abort ();
3618
3619 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3620
3621 if (GOT_TLS_GDESC_P (tls_type))
3622 {
3623 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3624 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3625 <= htab->elf.sgotplt->size);
3626 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3627 + htab->elf.sgotplt->output_offset
3628 + offplt
3629 + htab->sgotplt_jump_table_size);
3630 sreloc = htab->elf.srelplt;
3631 loc = sreloc->contents;
3632 loc += (htab->next_tls_desc_index++
3633 * sizeof (Elf32_External_Rel));
3634 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3635 <= sreloc->contents + sreloc->size);
3636 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3637 if (indx == 0)
3638 {
3639 BFD_ASSERT (! unresolved_reloc);
3640 bfd_put_32 (output_bfd,
3641 relocation - elf_i386_dtpoff_base (info),
3642 htab->elf.sgotplt->contents + offplt
3643 + htab->sgotplt_jump_table_size + 4);
3644 }
3645 else
3646 {
3647 bfd_put_32 (output_bfd, 0,
3648 htab->elf.sgotplt->contents + offplt
3649 + htab->sgotplt_jump_table_size + 4);
3650 }
3651 }
3652
3653 sreloc = htab->elf.srelgot;
3654
3655 outrel.r_offset = (htab->elf.sgot->output_section->vma
3656 + htab->elf.sgot->output_offset + off);
3657
3658 if (GOT_TLS_GD_P (tls_type))
3659 dr_type = R_386_TLS_DTPMOD32;
3660 else if (GOT_TLS_GDESC_P (tls_type))
3661 goto dr_done;
3662 else if (tls_type == GOT_TLS_IE_POS)
3663 dr_type = R_386_TLS_TPOFF;
3664 else
3665 dr_type = R_386_TLS_TPOFF32;
3666
3667 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3668 bfd_put_32 (output_bfd,
3669 relocation - elf_i386_dtpoff_base (info),
3670 htab->elf.sgot->contents + off);
3671 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3672 bfd_put_32 (output_bfd,
3673 elf_i386_dtpoff_base (info) - relocation,
3674 htab->elf.sgot->contents + off);
3675 else if (dr_type != R_386_TLS_DESC)
3676 bfd_put_32 (output_bfd, 0,
3677 htab->elf.sgot->contents + off);
3678 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3679
3680 loc = sreloc->contents;
3681 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3682 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3683 <= sreloc->contents + sreloc->size);
3684 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3685
3686 if (GOT_TLS_GD_P (tls_type))
3687 {
3688 if (indx == 0)
3689 {
3690 BFD_ASSERT (! unresolved_reloc);
3691 bfd_put_32 (output_bfd,
3692 relocation - elf_i386_dtpoff_base (info),
3693 htab->elf.sgot->contents + off + 4);
3694 }
3695 else
3696 {
3697 bfd_put_32 (output_bfd, 0,
3698 htab->elf.sgot->contents + off + 4);
3699 outrel.r_info = ELF32_R_INFO (indx,
3700 R_386_TLS_DTPOFF32);
3701 outrel.r_offset += 4;
3702 sreloc->reloc_count++;
3703 loc += sizeof (Elf32_External_Rel);
3704 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3705 <= sreloc->contents + sreloc->size);
3706 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3707 }
3708 }
3709 else if (tls_type == GOT_TLS_IE_BOTH)
3710 {
3711 bfd_put_32 (output_bfd,
3712 (indx == 0
3713 ? relocation - elf_i386_dtpoff_base (info)
3714 : 0),
3715 htab->elf.sgot->contents + off + 4);
3716 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3717 outrel.r_offset += 4;
3718 sreloc->reloc_count++;
3719 loc += sizeof (Elf32_External_Rel);
3720 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3721 }
3722
3723 dr_done:
3724 if (h != NULL)
3725 h->got.offset |= 1;
3726 else
3727 local_got_offsets[r_symndx] |= 1;
3728 }
3729
3730 if (off >= (bfd_vma) -2
3731 && ! GOT_TLS_GDESC_P (tls_type))
3732 abort ();
3733 if (r_type == R_386_TLS_GOTDESC
3734 || r_type == R_386_TLS_DESC_CALL)
3735 {
3736 relocation = htab->sgotplt_jump_table_size + offplt;
3737 unresolved_reloc = FALSE;
3738 }
3739 else if (r_type == ELF32_R_TYPE (rel->r_info))
3740 {
3741 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3742 + htab->elf.sgotplt->output_offset;
3743 relocation = htab->elf.sgot->output_section->vma
3744 + htab->elf.sgot->output_offset + off - g_o_t;
3745 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3746 && tls_type == GOT_TLS_IE_BOTH)
3747 relocation += 4;
3748 if (r_type == R_386_TLS_IE)
3749 relocation += g_o_t;
3750 unresolved_reloc = FALSE;
3751 }
3752 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3753 {
3754 unsigned int val, type;
3755 bfd_vma roff;
3756
3757 /* GD->IE transition. */
3758 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3759 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3760 if (type == 0x04)
3761 {
3762 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3763 Change it into:
3764 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3765 val >>= 3;
3766 roff = rel->r_offset - 3;
3767 }
3768 else
3769 {
3770 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3771 Change it into:
3772 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3773 roff = rel->r_offset - 2;
3774 }
3775 memcpy (contents + roff,
3776 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3777 contents[roff + 7] = 0x80 | (val & 7);
3778 /* If foo is used only with foo@gotntpoff(%reg) and
3779 foo@indntpoff, but not with foo@gottpoff(%reg), change
3780 subl $foo@gottpoff(%reg), %eax
3781 into:
3782 addl $foo@gotntpoff(%reg), %eax. */
3783 if (tls_type == GOT_TLS_IE_POS)
3784 contents[roff + 6] = 0x03;
3785 bfd_put_32 (output_bfd,
3786 htab->elf.sgot->output_section->vma
3787 + htab->elf.sgot->output_offset + off
3788 - htab->elf.sgotplt->output_section->vma
3789 - htab->elf.sgotplt->output_offset,
3790 contents + roff + 8);
3791 /* Skip R_386_PLT32. */
3792 rel++;
3793 continue;
3794 }
3795 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3796 {
3797 /* GDesc -> IE transition.
3798 It's originally something like:
3799 leal x@tlsdesc(%ebx), %eax
3800
3801 Change it to:
3802 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3803 or:
3804 movl x@gottpoff(%ebx), %eax # before negl %eax
3805
3806 Registers other than %eax may be set up here. */
3807
3808 bfd_vma roff;
3809
3810 /* First, make sure it's a leal adding ebx to a 32-bit
3811 offset into any register, although it's probably
3812 almost always going to be eax. */
3813 roff = rel->r_offset;
3814
3815 /* Now modify the instruction as appropriate. */
3816 /* To turn a leal into a movl in the form we use it, it
3817 suffices to change the first byte from 0x8d to 0x8b.
3818 aoliva FIXME: should we decide to keep the leal, all
3819 we have to do is remove the statement below, and
3820 adjust the relaxation of R_386_TLS_DESC_CALL. */
3821 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3822
3823 if (tls_type == GOT_TLS_IE_BOTH)
3824 off += 4;
3825
3826 bfd_put_32 (output_bfd,
3827 htab->elf.sgot->output_section->vma
3828 + htab->elf.sgot->output_offset + off
3829 - htab->elf.sgotplt->output_section->vma
3830 - htab->elf.sgotplt->output_offset,
3831 contents + roff);
3832 continue;
3833 }
3834 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3835 {
3836 /* GDesc -> IE transition.
3837 It's originally:
3838 call *(%eax)
3839
3840 Change it to:
3841 xchg %ax,%ax
3842 or
3843 negl %eax
3844 depending on how we transformed the TLS_GOTDESC above.
3845 */
3846
3847 bfd_vma roff;
3848
3849 roff = rel->r_offset;
3850
3851 /* Now modify the instruction as appropriate. */
3852 if (tls_type != GOT_TLS_IE_NEG)
3853 {
3854 /* xchg %ax,%ax */
3855 bfd_put_8 (output_bfd, 0x66, contents + roff);
3856 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3857 }
3858 else
3859 {
3860 /* negl %eax */
3861 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3862 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3863 }
3864
3865 continue;
3866 }
3867 else
3868 BFD_ASSERT (FALSE);
3869 break;
3870
3871 case R_386_TLS_LDM:
3872 if (! elf_i386_tls_transition (info, input_bfd,
3873 input_section, contents,
3874 symtab_hdr, sym_hashes,
3875 &r_type, GOT_UNKNOWN, rel,
3876 relend, h, r_symndx))
3877 return FALSE;
3878
3879 if (r_type != R_386_TLS_LDM)
3880 {
3881 /* LD->LE transition:
3882 leal foo(%reg), %eax; call ___tls_get_addr.
3883 We change it into:
3884 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3885 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3886 memcpy (contents + rel->r_offset - 2,
3887 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3888 /* Skip R_386_PC32/R_386_PLT32. */
3889 rel++;
3890 continue;
3891 }
3892
3893 if (htab->elf.sgot == NULL)
3894 abort ();
3895
3896 off = htab->tls_ldm_got.offset;
3897 if (off & 1)
3898 off &= ~1;
3899 else
3900 {
3901 Elf_Internal_Rela outrel;
3902 bfd_byte *loc;
3903
3904 if (htab->elf.srelgot == NULL)
3905 abort ();
3906
3907 outrel.r_offset = (htab->elf.sgot->output_section->vma
3908 + htab->elf.sgot->output_offset + off);
3909
3910 bfd_put_32 (output_bfd, 0,
3911 htab->elf.sgot->contents + off);
3912 bfd_put_32 (output_bfd, 0,
3913 htab->elf.sgot->contents + off + 4);
3914 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3915 loc = htab->elf.srelgot->contents;
3916 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3917 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3918 htab->tls_ldm_got.offset |= 1;
3919 }
3920 relocation = htab->elf.sgot->output_section->vma
3921 + htab->elf.sgot->output_offset + off
3922 - htab->elf.sgotplt->output_section->vma
3923 - htab->elf.sgotplt->output_offset;
3924 unresolved_reloc = FALSE;
3925 break;
3926
3927 case R_386_TLS_LDO_32:
3928 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3929 relocation -= elf_i386_dtpoff_base (info);
3930 else
3931 /* When converting LDO to LE, we must negate. */
3932 relocation = -elf_i386_tpoff (info, relocation);
3933 break;
3934
3935 case R_386_TLS_LE_32:
3936 case R_386_TLS_LE:
3937 if (!info->executable)
3938 {
3939 Elf_Internal_Rela outrel;
3940 asection *sreloc;
3941 bfd_byte *loc;
3942 int indx;
3943
3944 outrel.r_offset = rel->r_offset
3945 + input_section->output_section->vma
3946 + input_section->output_offset;
3947 if (h != NULL && h->dynindx != -1)
3948 indx = h->dynindx;
3949 else
3950 indx = 0;
3951 if (r_type == R_386_TLS_LE_32)
3952 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3953 else
3954 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3955 sreloc = elf_section_data (input_section)->sreloc;
3956 if (sreloc == NULL)
3957 abort ();
3958 loc = sreloc->contents;
3959 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3960 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3961 if (indx)
3962 continue;
3963 else if (r_type == R_386_TLS_LE_32)
3964 relocation = elf_i386_dtpoff_base (info) - relocation;
3965 else
3966 relocation -= elf_i386_dtpoff_base (info);
3967 }
3968 else if (r_type == R_386_TLS_LE_32)
3969 relocation = elf_i386_tpoff (info, relocation);
3970 else
3971 relocation = -elf_i386_tpoff (info, relocation);
3972 break;
3973
3974 default:
3975 break;
3976 }
3977
3978 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3979 because such sections are not SEC_ALLOC and thus ld.so will
3980 not process them. */
3981 if (unresolved_reloc
3982 && !((input_section->flags & SEC_DEBUGGING) != 0
3983 && h->def_dynamic))
3984 {
3985 (*_bfd_error_handler)
3986 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3987 input_bfd,
3988 input_section,
3989 (long) rel->r_offset,
3990 howto->name,
3991 h->root.root.string);
3992 return FALSE;
3993 }
3994
3995 do_relocation:
3996 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3997 contents, rel->r_offset,
3998 relocation, 0);
3999
4000 if (r != bfd_reloc_ok)
4001 {
4002 const char *name;
4003
4004 if (h != NULL)
4005 name = h->root.root.string;
4006 else
4007 {
4008 name = bfd_elf_string_from_elf_section (input_bfd,
4009 symtab_hdr->sh_link,
4010 sym->st_name);
4011 if (name == NULL)
4012 return FALSE;
4013 if (*name == '\0')
4014 name = bfd_section_name (input_bfd, sec);
4015 }
4016
4017 if (r == bfd_reloc_overflow)
4018 {
4019 if (! ((*info->callbacks->reloc_overflow)
4020 (info, (h ? &h->root : NULL), name, howto->name,
4021 (bfd_vma) 0, input_bfd, input_section,
4022 rel->r_offset)))
4023 return FALSE;
4024 }
4025 else
4026 {
4027 (*_bfd_error_handler)
4028 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4029 input_bfd, input_section,
4030 (long) rel->r_offset, name, (int) r);
4031 return FALSE;
4032 }
4033 }
4034 }
4035
4036 return TRUE;
4037 }
4038
4039 /* Finish up dynamic symbol handling. We set the contents of various
4040 dynamic sections here. */
4041
4042 static bfd_boolean
4043 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4044 struct bfd_link_info *info,
4045 struct elf_link_hash_entry *h,
4046 Elf_Internal_Sym *sym)
4047 {
4048 struct elf_i386_link_hash_table *htab;
4049
4050 htab = elf_i386_hash_table (info);
4051
4052 if (h->plt.offset != (bfd_vma) -1)
4053 {
4054 bfd_vma plt_index;
4055 bfd_vma got_offset;
4056 Elf_Internal_Rela rel;
4057 bfd_byte *loc;
4058 asection *plt, *gotplt, *relplt;
4059
4060 /* When building a static executable, use .iplt, .igot.plt and
4061 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4062 if (htab->elf.splt != NULL)
4063 {
4064 plt = htab->elf.splt;
4065 gotplt = htab->elf.sgotplt;
4066 relplt = htab->elf.srelplt;
4067 }
4068 else
4069 {
4070 plt = htab->elf.iplt;
4071 gotplt = htab->elf.igotplt;
4072 relplt = htab->elf.irelplt;
4073 }
4074
4075 /* This symbol has an entry in the procedure linkage table. Set
4076 it up. */
4077
4078 if ((h->dynindx == -1
4079 && !((h->forced_local || info->executable)
4080 && h->def_regular
4081 && h->type == STT_GNU_IFUNC))
4082 || plt == NULL
4083 || gotplt == NULL
4084 || relplt == NULL)
4085 abort ();
4086
4087 /* Get the index in the procedure linkage table which
4088 corresponds to this symbol. This is the index of this symbol
4089 in all the symbols for which we are making plt entries. The
4090 first entry in the procedure linkage table is reserved.
4091
4092 Get the offset into the .got table of the entry that
4093 corresponds to this function. Each .got entry is 4 bytes.
4094 The first three are reserved.
4095
4096 For static executables, we don't reserve anything. */
4097
4098 if (plt == htab->elf.splt)
4099 {
4100 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
4101 got_offset = (plt_index + 3) * 4;
4102 }
4103 else
4104 {
4105 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
4106 got_offset = plt_index * 4;
4107 }
4108
4109 /* Fill in the entry in the procedure linkage table. */
4110 if (! info->shared)
4111 {
4112 memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry,
4113 PLT_ENTRY_SIZE);
4114 bfd_put_32 (output_bfd,
4115 (gotplt->output_section->vma
4116 + gotplt->output_offset
4117 + got_offset),
4118 plt->contents + h->plt.offset + 2);
4119
4120 if (htab->is_vxworks)
4121 {
4122 int s, k, reloc_index;
4123
4124 /* Create the R_386_32 relocation referencing the GOT
4125 for this PLT entry. */
4126
4127 /* S: Current slot number (zero-based). */
4128 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
4129 /* K: Number of relocations for PLTResolve. */
4130 if (info->shared)
4131 k = PLTRESOLVE_RELOCS_SHLIB;
4132 else
4133 k = PLTRESOLVE_RELOCS;
4134 /* Skip the PLTresolve relocations, and the relocations for
4135 the other PLT slots. */
4136 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4137 loc = (htab->srelplt2->contents + reloc_index
4138 * sizeof (Elf32_External_Rel));
4139
4140 rel.r_offset = (htab->elf.splt->output_section->vma
4141 + htab->elf.splt->output_offset
4142 + h->plt.offset + 2),
4143 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4144 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4145
4146 /* Create the R_386_32 relocation referencing the beginning of
4147 the PLT for this GOT entry. */
4148 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4149 + htab->elf.sgotplt->output_offset
4150 + got_offset);
4151 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4152 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4153 loc + sizeof (Elf32_External_Rel));
4154 }
4155 }
4156 else
4157 {
4158 memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry,
4159 PLT_ENTRY_SIZE);
4160 bfd_put_32 (output_bfd, got_offset,
4161 plt->contents + h->plt.offset + 2);
4162 }
4163
4164 /* Don't fill PLT entry for static executables. */
4165 if (plt == htab->elf.splt)
4166 {
4167 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4168 plt->contents + h->plt.offset + 7);
4169 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
4170 plt->contents + h->plt.offset + 12);
4171 }
4172
4173 /* Fill in the entry in the global offset table. */
4174 bfd_put_32 (output_bfd,
4175 (plt->output_section->vma
4176 + plt->output_offset
4177 + h->plt.offset
4178 + 6),
4179 gotplt->contents + got_offset);
4180
4181 /* Fill in the entry in the .rel.plt section. */
4182 rel.r_offset = (gotplt->output_section->vma
4183 + gotplt->output_offset
4184 + got_offset);
4185 if (h->dynindx == -1
4186 || ((info->executable
4187 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4188 && h->def_regular
4189 && h->type == STT_GNU_IFUNC))
4190 {
4191 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4192 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4193 in the .got.plt section. */
4194 bfd_put_32 (output_bfd,
4195 (h->root.u.def.value
4196 + h->root.u.def.section->output_section->vma
4197 + h->root.u.def.section->output_offset),
4198 gotplt->contents + got_offset);
4199 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4200 }
4201 else
4202 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4203 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4204 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4205
4206 if (!h->def_regular)
4207 {
4208 /* Mark the symbol as undefined, rather than as defined in
4209 the .plt section. Leave the value if there were any
4210 relocations where pointer equality matters (this is a clue
4211 for the dynamic linker, to make function pointer
4212 comparisons work between an application and shared
4213 library), otherwise set it to zero. If a function is only
4214 called from a binary, there is no need to slow down
4215 shared libraries because of that. */
4216 sym->st_shndx = SHN_UNDEF;
4217 if (!h->pointer_equality_needed)
4218 sym->st_value = 0;
4219 }
4220 }
4221
4222 if (h->got.offset != (bfd_vma) -1
4223 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4224 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4225 {
4226 Elf_Internal_Rela rel;
4227 bfd_byte *loc;
4228
4229 /* This symbol has an entry in the global offset table. Set it
4230 up. */
4231
4232 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4233 abort ();
4234
4235 rel.r_offset = (htab->elf.sgot->output_section->vma
4236 + htab->elf.sgot->output_offset
4237 + (h->got.offset & ~(bfd_vma) 1));
4238
4239 /* If this is a static link, or it is a -Bsymbolic link and the
4240 symbol is defined locally or was forced to be local because
4241 of a version file, we just want to emit a RELATIVE reloc.
4242 The entry in the global offset table will already have been
4243 initialized in the relocate_section function. */
4244 if (h->def_regular
4245 && h->type == STT_GNU_IFUNC)
4246 {
4247 if (info->shared)
4248 {
4249 /* Generate R_386_GLOB_DAT. */
4250 goto do_glob_dat;
4251 }
4252 else
4253 {
4254 asection *plt;
4255
4256 if (!h->pointer_equality_needed)
4257 abort ();
4258
4259 /* For non-shared object, we can't use .got.plt, which
4260 contains the real function addres if we need pointer
4261 equality. We load the GOT entry with the PLT entry. */
4262 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4263 bfd_put_32 (output_bfd,
4264 (plt->output_section->vma
4265 + plt->output_offset + h->plt.offset),
4266 htab->elf.sgot->contents + h->got.offset);
4267 return TRUE;
4268 }
4269 }
4270 else if (info->shared
4271 && SYMBOL_REFERENCES_LOCAL (info, h))
4272 {
4273 BFD_ASSERT((h->got.offset & 1) != 0);
4274 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4275 }
4276 else
4277 {
4278 BFD_ASSERT((h->got.offset & 1) == 0);
4279 do_glob_dat:
4280 bfd_put_32 (output_bfd, (bfd_vma) 0,
4281 htab->elf.sgot->contents + h->got.offset);
4282 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4283 }
4284
4285 loc = htab->elf.srelgot->contents;
4286 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4287 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4288 }
4289
4290 if (h->needs_copy)
4291 {
4292 Elf_Internal_Rela rel;
4293 bfd_byte *loc;
4294
4295 /* This symbol needs a copy reloc. Set it up. */
4296
4297 if (h->dynindx == -1
4298 || (h->root.type != bfd_link_hash_defined
4299 && h->root.type != bfd_link_hash_defweak)
4300 || htab->srelbss == NULL)
4301 abort ();
4302
4303 rel.r_offset = (h->root.u.def.value
4304 + h->root.u.def.section->output_section->vma
4305 + h->root.u.def.section->output_offset);
4306 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4307 loc = htab->srelbss->contents;
4308 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4309 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4310 }
4311
4312 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4313 be NULL for local symbols.
4314
4315 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4316 is relative to the ".got" section. */
4317 if (sym != NULL
4318 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4319 || (!htab->is_vxworks && h == htab->elf.hgot)))
4320 sym->st_shndx = SHN_ABS;
4321
4322 return TRUE;
4323 }
4324
4325 /* Finish up local dynamic symbol handling. We set the contents of
4326 various dynamic sections here. */
4327
4328 static bfd_boolean
4329 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4330 {
4331 struct elf_link_hash_entry *h
4332 = (struct elf_link_hash_entry *) *slot;
4333 struct bfd_link_info *info
4334 = (struct bfd_link_info *) inf;
4335
4336 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4337 h, NULL);
4338 }
4339
4340 /* Used to decide how to sort relocs in an optimal manner for the
4341 dynamic linker, before writing them out. */
4342
4343 static enum elf_reloc_type_class
4344 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4345 {
4346 switch (ELF32_R_TYPE (rela->r_info))
4347 {
4348 case R_386_RELATIVE:
4349 return reloc_class_relative;
4350 case R_386_JUMP_SLOT:
4351 return reloc_class_plt;
4352 case R_386_COPY:
4353 return reloc_class_copy;
4354 default:
4355 return reloc_class_normal;
4356 }
4357 }
4358
4359 /* Finish up the dynamic sections. */
4360
4361 static bfd_boolean
4362 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4363 struct bfd_link_info *info)
4364 {
4365 struct elf_i386_link_hash_table *htab;
4366 bfd *dynobj;
4367 asection *sdyn;
4368
4369 htab = elf_i386_hash_table (info);
4370 dynobj = htab->elf.dynobj;
4371 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4372
4373 if (htab->elf.dynamic_sections_created)
4374 {
4375 Elf32_External_Dyn *dyncon, *dynconend;
4376
4377 if (sdyn == NULL || htab->elf.sgot == NULL)
4378 abort ();
4379
4380 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4381 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4382 for (; dyncon < dynconend; dyncon++)
4383 {
4384 Elf_Internal_Dyn dyn;
4385 asection *s;
4386
4387 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4388
4389 switch (dyn.d_tag)
4390 {
4391 default:
4392 if (htab->is_vxworks
4393 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4394 break;
4395 continue;
4396
4397 case DT_PLTGOT:
4398 s = htab->elf.sgotplt;
4399 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4400 break;
4401
4402 case DT_JMPREL:
4403 s = htab->elf.srelplt;
4404 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4405 break;
4406
4407 case DT_PLTRELSZ:
4408 s = htab->elf.srelplt;
4409 dyn.d_un.d_val = s->size;
4410 break;
4411
4412 case DT_RELSZ:
4413 /* My reading of the SVR4 ABI indicates that the
4414 procedure linkage table relocs (DT_JMPREL) should be
4415 included in the overall relocs (DT_REL). This is
4416 what Solaris does. However, UnixWare can not handle
4417 that case. Therefore, we override the DT_RELSZ entry
4418 here to make it not include the JMPREL relocs. */
4419 s = htab->elf.srelplt;
4420 if (s == NULL)
4421 continue;
4422 dyn.d_un.d_val -= s->size;
4423 break;
4424
4425 case DT_REL:
4426 /* We may not be using the standard ELF linker script.
4427 If .rel.plt is the first .rel section, we adjust
4428 DT_REL to not include it. */
4429 s = htab->elf.srelplt;
4430 if (s == NULL)
4431 continue;
4432 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4433 continue;
4434 dyn.d_un.d_ptr += s->size;
4435 break;
4436 }
4437
4438 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4439 }
4440
4441 /* Fill in the first entry in the procedure linkage table. */
4442 if (htab->elf.splt && htab->elf.splt->size > 0)
4443 {
4444 if (info->shared)
4445 {
4446 memcpy (htab->elf.splt->contents, elf_i386_pic_plt0_entry,
4447 sizeof (elf_i386_pic_plt0_entry));
4448 memset (htab->elf.splt->contents + sizeof (elf_i386_pic_plt0_entry),
4449 htab->plt0_pad_byte,
4450 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
4451 }
4452 else
4453 {
4454 memcpy (htab->elf.splt->contents, elf_i386_plt0_entry,
4455 sizeof(elf_i386_plt0_entry));
4456 memset (htab->elf.splt->contents + sizeof (elf_i386_plt0_entry),
4457 htab->plt0_pad_byte,
4458 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
4459 bfd_put_32 (output_bfd,
4460 (htab->elf.sgotplt->output_section->vma
4461 + htab->elf.sgotplt->output_offset
4462 + 4),
4463 htab->elf.splt->contents + 2);
4464 bfd_put_32 (output_bfd,
4465 (htab->elf.sgotplt->output_section->vma
4466 + htab->elf.sgotplt->output_offset
4467 + 8),
4468 htab->elf.splt->contents + 8);
4469
4470 if (htab->is_vxworks)
4471 {
4472 Elf_Internal_Rela rel;
4473
4474 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4475 On IA32 we use REL relocations so the addend goes in
4476 the PLT directly. */
4477 rel.r_offset = (htab->elf.splt->output_section->vma
4478 + htab->elf.splt->output_offset
4479 + 2);
4480 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4481 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4482 htab->srelplt2->contents);
4483 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4484 rel.r_offset = (htab->elf.splt->output_section->vma
4485 + htab->elf.splt->output_offset
4486 + 8);
4487 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4488 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4489 htab->srelplt2->contents +
4490 sizeof (Elf32_External_Rel));
4491 }
4492 }
4493
4494 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4495 really seem like the right value. */
4496 elf_section_data (htab->elf.splt->output_section)
4497 ->this_hdr.sh_entsize = 4;
4498
4499 /* Correct the .rel.plt.unloaded relocations. */
4500 if (htab->is_vxworks && !info->shared)
4501 {
4502 int num_plts = (htab->elf.splt->size / PLT_ENTRY_SIZE) - 1;
4503 unsigned char *p;
4504
4505 p = htab->srelplt2->contents;
4506 if (info->shared)
4507 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4508 else
4509 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4510
4511 for (; num_plts; num_plts--)
4512 {
4513 Elf_Internal_Rela rel;
4514 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4515 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4516 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4517 p += sizeof (Elf32_External_Rel);
4518
4519 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4520 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4521 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4522 p += sizeof (Elf32_External_Rel);
4523 }
4524 }
4525 }
4526 }
4527
4528 if (htab->elf.sgotplt)
4529 {
4530 /* Fill in the first three entries in the global offset table. */
4531 if (htab->elf.sgotplt->size > 0)
4532 {
4533 bfd_put_32 (output_bfd,
4534 (sdyn == NULL ? 0
4535 : sdyn->output_section->vma + sdyn->output_offset),
4536 htab->elf.sgotplt->contents);
4537 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4538 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4539 }
4540
4541 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4542 }
4543
4544 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4545 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4546
4547 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4548 htab_traverse (htab->loc_hash_table,
4549 elf_i386_finish_local_dynamic_symbol,
4550 info);
4551
4552 return TRUE;
4553 }
4554
4555 /* Return address for Ith PLT stub in section PLT, for relocation REL
4556 or (bfd_vma) -1 if it should not be included. */
4557
4558 static bfd_vma
4559 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4560 const arelent *rel ATTRIBUTE_UNUSED)
4561 {
4562 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4563 }
4564
4565 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4566
4567 static bfd_boolean
4568 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4569 {
4570 if (h->plt.offset != (bfd_vma) -1
4571 && !h->def_regular
4572 && !h->pointer_equality_needed)
4573 return FALSE;
4574
4575 return _bfd_elf_hash_symbol (h);
4576 }
4577
4578 /* Hook called by the linker routine which adds symbols from an object
4579 file. */
4580
4581 static bfd_boolean
4582 elf_i386_add_symbol_hook (bfd * abfd ATTRIBUTE_UNUSED,
4583 struct bfd_link_info * info ATTRIBUTE_UNUSED,
4584 Elf_Internal_Sym * sym,
4585 const char ** namep ATTRIBUTE_UNUSED,
4586 flagword * flagsp ATTRIBUTE_UNUSED,
4587 asection ** secp ATTRIBUTE_UNUSED,
4588 bfd_vma * valp ATTRIBUTE_UNUSED)
4589 {
4590 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4591 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4592
4593 return TRUE;
4594 }
4595
4596 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4597 #define TARGET_LITTLE_NAME "elf32-i386"
4598 #define ELF_ARCH bfd_arch_i386
4599 #define ELF_MACHINE_CODE EM_386
4600 #define ELF_MAXPAGESIZE 0x1000
4601
4602 #define elf_backend_can_gc_sections 1
4603 #define elf_backend_can_refcount 1
4604 #define elf_backend_want_got_plt 1
4605 #define elf_backend_plt_readonly 1
4606 #define elf_backend_want_plt_sym 0
4607 #define elf_backend_got_header_size 12
4608
4609 /* Support RELA for objdump of prelink objects. */
4610 #define elf_info_to_howto elf_i386_info_to_howto_rel
4611 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4612
4613 #define bfd_elf32_mkobject elf_i386_mkobject
4614
4615 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4616 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4617 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4618 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4619 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4620
4621 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4622 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4623 #define elf_backend_check_relocs elf_i386_check_relocs
4624 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4625 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4626 #define elf_backend_fake_sections elf_i386_fake_sections
4627 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4628 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4629 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4630 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4631 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4632 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4633 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4634 #define elf_backend_relocate_section elf_i386_relocate_section
4635 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4636 #define elf_backend_always_size_sections elf_i386_always_size_sections
4637 #define elf_backend_omit_section_dynsym \
4638 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4639 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4640 #define elf_backend_hash_symbol elf_i386_hash_symbol
4641 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4642 #undef elf_backend_post_process_headers
4643 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4644
4645 #include "elf32-target.h"
4646
4647 /* FreeBSD support. */
4648
4649 #undef TARGET_LITTLE_SYM
4650 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4651 #undef TARGET_LITTLE_NAME
4652 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4653 #undef ELF_OSABI
4654 #define ELF_OSABI ELFOSABI_FREEBSD
4655
4656 /* The kernel recognizes executables as valid only if they carry a
4657 "FreeBSD" label in the ELF header. So we put this label on all
4658 executables and (for simplicity) also all other object files. */
4659
4660 static void
4661 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4662 {
4663 _bfd_elf_set_osabi (abfd, info);
4664
4665 #ifdef OLD_FREEBSD_ABI_LABEL
4666 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4667 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4668 #endif
4669 }
4670
4671 #undef elf_backend_post_process_headers
4672 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4673 #undef elf32_bed
4674 #define elf32_bed elf32_i386_fbsd_bed
4675
4676 #undef elf_backend_add_symbol_hook
4677
4678 #include "elf32-target.h"
4679
4680 /* VxWorks support. */
4681
4682 #undef TARGET_LITTLE_SYM
4683 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4684 #undef TARGET_LITTLE_NAME
4685 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4686 #undef ELF_OSABI
4687
4688 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4689
4690 static struct bfd_link_hash_table *
4691 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4692 {
4693 struct bfd_link_hash_table *ret;
4694 struct elf_i386_link_hash_table *htab;
4695
4696 ret = elf_i386_link_hash_table_create (abfd);
4697 if (ret)
4698 {
4699 htab = (struct elf_i386_link_hash_table *) ret;
4700 htab->is_vxworks = 1;
4701 htab->plt0_pad_byte = 0x90;
4702 }
4703
4704 return ret;
4705 }
4706
4707
4708 #undef elf_backend_relocs_compatible
4709 #undef elf_backend_post_process_headers
4710 #undef bfd_elf32_bfd_link_hash_table_create
4711 #define bfd_elf32_bfd_link_hash_table_create \
4712 elf_i386_vxworks_link_hash_table_create
4713 #undef elf_backend_add_symbol_hook
4714 #define elf_backend_add_symbol_hook \
4715 elf_vxworks_add_symbol_hook
4716 #undef elf_backend_link_output_symbol_hook
4717 #define elf_backend_link_output_symbol_hook \
4718 elf_vxworks_link_output_symbol_hook
4719 #undef elf_backend_emit_relocs
4720 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4721 #undef elf_backend_final_write_processing
4722 #define elf_backend_final_write_processing \
4723 elf_vxworks_final_write_processing
4724
4725 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4726 define it. */
4727 #undef elf_backend_want_plt_sym
4728 #define elf_backend_want_plt_sym 1
4729
4730 #undef elf32_bed
4731 #define elf32_bed elf32_i386_vxworks_bed
4732
4733 #include "elf32-target.h"
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