2009-06-13 H.J. Lu <hongjiu.lu@intel.com>
[binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #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 /* The i386 linker needs to keep track of the number of relocs that it
581 decides to copy as dynamic relocs in check_relocs for each symbol.
582 This is so that it can later discard them if they are found to be
583 unnecessary. We store the information in a field extending the
584 regular ELF linker hash table. */
585
586 struct elf_i386_dyn_relocs
587 {
588 struct elf_i386_dyn_relocs *next;
589
590 /* The input section of the reloc. */
591 asection *sec;
592
593 /* Total number of relocs copied for the input section. */
594 bfd_size_type count;
595
596 /* Number of pc-relative relocs copied for the input section. */
597 bfd_size_type pc_count;
598 };
599
600 /* i386 ELF linker hash entry. */
601
602 struct elf_i386_link_hash_entry
603 {
604 struct elf_link_hash_entry elf;
605
606 /* Track dynamic relocs copied for this symbol. */
607 struct elf_i386_dyn_relocs *dyn_relocs;
608
609 #define GOT_UNKNOWN 0
610 #define GOT_NORMAL 1
611 #define GOT_TLS_GD 2
612 #define GOT_TLS_IE 4
613 #define GOT_TLS_IE_POS 5
614 #define GOT_TLS_IE_NEG 6
615 #define GOT_TLS_IE_BOTH 7
616 #define GOT_TLS_GDESC 8
617 #define GOT_TLS_GD_BOTH_P(type) \
618 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
619 #define GOT_TLS_GD_P(type) \
620 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
621 #define GOT_TLS_GDESC_P(type) \
622 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
623 #define GOT_TLS_GD_ANY_P(type) \
624 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
625 unsigned char tls_type;
626
627 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
628 starting at the end of the jump table. */
629 bfd_vma tlsdesc_got;
630 };
631
632 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
633
634 struct elf_i386_obj_tdata
635 {
636 struct elf_obj_tdata root;
637
638 /* tls_type for each local got entry. */
639 char *local_got_tls_type;
640
641 /* GOTPLT entries for TLS descriptors. */
642 bfd_vma *local_tlsdesc_gotent;
643 };
644
645 #define elf_i386_tdata(abfd) \
646 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
647
648 #define elf_i386_local_got_tls_type(abfd) \
649 (elf_i386_tdata (abfd)->local_got_tls_type)
650
651 #define elf_i386_local_tlsdesc_gotent(abfd) \
652 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
653
654 #define is_i386_elf(bfd) \
655 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
656 && elf_tdata (bfd) != NULL \
657 && elf_object_id (bfd) == I386_ELF_TDATA)
658
659 static bfd_boolean
660 elf_i386_mkobject (bfd *abfd)
661 {
662 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
663 I386_ELF_TDATA);
664 }
665
666 /* i386 ELF linker hash table. */
667
668 struct elf_i386_link_hash_table
669 {
670 struct elf_link_hash_table elf;
671
672 /* Short-cuts to get to dynamic linker sections. */
673 asection *sgot;
674 asection *sgotplt;
675 asection *srelgot;
676 asection *splt;
677 asection *srelplt;
678 asection *sdynbss;
679 asection *srelbss;
680 asection *igotplt;
681 asection *iplt;
682 asection *irelplt;
683 asection *irelifunc;
684
685 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
686 asection *srelplt2;
687
688 /* True if the target system is VxWorks. */
689 int is_vxworks;
690
691 /* Value used to fill the last word of the first plt entry. */
692 bfd_byte plt0_pad_byte;
693
694 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
695 bfd_vma next_tls_desc_index;
696
697 union {
698 bfd_signed_vma refcount;
699 bfd_vma offset;
700 } tls_ldm_got;
701
702 /* The amount of space used by the reserved portion of the sgotplt
703 section, plus whatever space is used by the jump slots. */
704 bfd_vma sgotplt_jump_table_size;
705
706 /* Small local sym to section mapping cache. */
707 struct sym_sec_cache sym_sec;
708
709 /* _TLS_MODULE_BASE_ symbol. */
710 struct bfd_link_hash_entry *tls_module_base;
711
712 /* Used by local STT_GNU_IFUNC symbols. */
713 htab_t loc_hash_table;
714 void *loc_hash_memory;
715 };
716
717 /* Get the i386 ELF linker hash table from a link_info structure. */
718
719 #define elf_i386_hash_table(p) \
720 ((struct elf_i386_link_hash_table *) ((p)->hash))
721
722 #define elf_i386_compute_jump_table_size(htab) \
723 ((htab)->next_tls_desc_index * 4)
724
725 /* Create an entry in an i386 ELF linker hash table. */
726
727 static struct bfd_hash_entry *
728 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
729 struct bfd_hash_table *table,
730 const char *string)
731 {
732 /* Allocate the structure if it has not already been allocated by a
733 subclass. */
734 if (entry == NULL)
735 {
736 entry = bfd_hash_allocate (table,
737 sizeof (struct elf_i386_link_hash_entry));
738 if (entry == NULL)
739 return entry;
740 }
741
742 /* Call the allocation method of the superclass. */
743 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
744 if (entry != NULL)
745 {
746 struct elf_i386_link_hash_entry *eh;
747
748 eh = (struct elf_i386_link_hash_entry *) entry;
749 eh->dyn_relocs = NULL;
750 eh->tls_type = GOT_UNKNOWN;
751 eh->tlsdesc_got = (bfd_vma) -1;
752 }
753
754 return entry;
755 }
756
757 static hashval_t
758 elf_i386_local_hash (int id, int r_sym)
759 {
760 return ((((id & 0xff) << 24) | ((id & 0xff00) << 8))
761 ^ r_sym ^ (id >> 16));
762 }
763
764 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
765 for local symbol so that we can handle local STT_GNU_IFUNC symbols
766 as global symbol. We reuse indx and dynstr_index for local symbol
767 hash since they aren't used by global symbols in this backend. */
768
769 static hashval_t
770 elf_i386_local_htab_hash (const void *ptr)
771 {
772 struct elf_link_hash_entry *h
773 = (struct elf_link_hash_entry *) ptr;
774 return elf_i386_local_hash (h->indx, h->dynstr_index);
775 }
776
777 /* Compare local hash entries. */
778
779 static int
780 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
781 {
782 struct elf_link_hash_entry *h1
783 = (struct elf_link_hash_entry *) ptr1;
784 struct elf_link_hash_entry *h2
785 = (struct elf_link_hash_entry *) ptr2;
786
787 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
788 }
789
790 /* Find and/or create a hash entry for local symbol. */
791
792 static struct elf_link_hash_entry *
793 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
794 bfd *abfd, const Elf_Internal_Rela *rel,
795 bfd_boolean create)
796 {
797 struct elf_i386_link_hash_entry e, *ret;
798 asection *sec = abfd->sections;
799 hashval_t h = elf_i386_local_hash (sec->id,
800 ELF32_R_SYM (rel->r_info));
801 void **slot;
802
803 e.elf.indx = sec->id;
804 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
805 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
806 create ? INSERT : NO_INSERT);
807
808 if (!slot)
809 return NULL;
810
811 if (*slot)
812 {
813 ret = (struct elf_i386_link_hash_entry *) *slot;
814 return &ret->elf;
815 }
816
817 ret = (struct elf_i386_link_hash_entry *)
818 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
819 sizeof (struct elf_i386_link_hash_entry));
820 if (ret)
821 {
822 memset (ret, 0, sizeof (*ret));
823 ret->elf.indx = sec->id;
824 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
825 ret->elf.dynindx = -1;
826 ret->elf.plt.offset = (bfd_vma) -1;
827 ret->elf.got.offset = (bfd_vma) -1;
828 *slot = ret;
829 }
830 return &ret->elf;
831 }
832
833 /* Create an i386 ELF linker hash table. */
834
835 static struct bfd_link_hash_table *
836 elf_i386_link_hash_table_create (bfd *abfd)
837 {
838 struct elf_i386_link_hash_table *ret;
839 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
840
841 ret = bfd_malloc (amt);
842 if (ret == NULL)
843 return NULL;
844
845 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
846 elf_i386_link_hash_newfunc,
847 sizeof (struct elf_i386_link_hash_entry)))
848 {
849 free (ret);
850 return NULL;
851 }
852
853 ret->sgot = NULL;
854 ret->sgotplt = NULL;
855 ret->srelgot = NULL;
856 ret->splt = NULL;
857 ret->srelplt = NULL;
858 ret->sdynbss = NULL;
859 ret->srelbss = NULL;
860 ret->igotplt= NULL;
861 ret->iplt = NULL;
862 ret->irelplt= NULL;
863 ret->irelifunc = NULL;
864 ret->tls_ldm_got.refcount = 0;
865 ret->next_tls_desc_index = 0;
866 ret->sgotplt_jump_table_size = 0;
867 ret->sym_sec.abfd = NULL;
868 ret->is_vxworks = 0;
869 ret->srelplt2 = NULL;
870 ret->plt0_pad_byte = 0;
871 ret->tls_module_base = NULL;
872
873 ret->loc_hash_table = htab_try_create (1024,
874 elf_i386_local_htab_hash,
875 elf_i386_local_htab_eq,
876 NULL);
877 ret->loc_hash_memory = objalloc_create ();
878 if (!ret->loc_hash_table || !ret->loc_hash_memory)
879 {
880 free (ret);
881 return NULL;
882 }
883
884 return &ret->elf.root;
885 }
886
887 /* Destroy an i386 ELF linker hash table. */
888
889 static void
890 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
891 {
892 struct elf_i386_link_hash_table *htab
893 = (struct elf_i386_link_hash_table *) hash;
894
895 if (htab->loc_hash_table)
896 htab_delete (htab->loc_hash_table);
897 if (htab->loc_hash_memory)
898 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
899 _bfd_generic_link_hash_table_free (hash);
900 }
901
902 /* Create .got, .gotplt, and .rela.got sections in DYNOBJ, and set up
903 shortcuts to them in our hash table. */
904
905 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
906 shortcuts to them in our hash table. */
907
908 static bfd_boolean
909 elf_i386_create_got_section (bfd *dynobj, struct bfd_link_info *info)
910 {
911 struct elf_i386_link_hash_table *htab;
912
913 if (! _bfd_elf_create_got_section (dynobj, info))
914 return FALSE;
915
916 htab = elf_i386_hash_table (info);
917 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
918 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
919 if (!htab->sgot || !htab->sgotplt)
920 abort ();
921
922 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
923 (SEC_ALLOC | SEC_LOAD
924 | SEC_HAS_CONTENTS
925 | SEC_IN_MEMORY
926 | SEC_LINKER_CREATED
927 | SEC_READONLY));
928 if (htab->srelgot == NULL
929 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
930 return FALSE;
931 return TRUE;
932 }
933
934 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
935 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
936 hash table. */
937
938 static bfd_boolean
939 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
940 {
941 struct elf_i386_link_hash_table *htab;
942
943 htab = elf_i386_hash_table (info);
944 if (!htab->sgot && !elf_i386_create_got_section (dynobj, info))
945 return FALSE;
946
947 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
948 return FALSE;
949
950 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
951 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
952 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
953 if (!info->shared)
954 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
955
956 if (!htab->splt || !htab->srelplt || !htab->sdynbss
957 || (!info->shared && !htab->srelbss))
958 abort ();
959
960 if (htab->is_vxworks
961 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2))
962 return FALSE;
963
964 return TRUE;
965 }
966
967 /* Copy the extra info we tack onto an elf_link_hash_entry. */
968
969 static void
970 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
971 struct elf_link_hash_entry *dir,
972 struct elf_link_hash_entry *ind)
973 {
974 struct elf_i386_link_hash_entry *edir, *eind;
975
976 edir = (struct elf_i386_link_hash_entry *) dir;
977 eind = (struct elf_i386_link_hash_entry *) ind;
978
979 if (eind->dyn_relocs != NULL)
980 {
981 if (edir->dyn_relocs != NULL)
982 {
983 struct elf_i386_dyn_relocs **pp;
984 struct elf_i386_dyn_relocs *p;
985
986 /* Add reloc counts against the indirect sym to the direct sym
987 list. Merge any entries against the same section. */
988 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
989 {
990 struct elf_i386_dyn_relocs *q;
991
992 for (q = edir->dyn_relocs; q != NULL; q = q->next)
993 if (q->sec == p->sec)
994 {
995 q->pc_count += p->pc_count;
996 q->count += p->count;
997 *pp = p->next;
998 break;
999 }
1000 if (q == NULL)
1001 pp = &p->next;
1002 }
1003 *pp = edir->dyn_relocs;
1004 }
1005
1006 edir->dyn_relocs = eind->dyn_relocs;
1007 eind->dyn_relocs = NULL;
1008 }
1009
1010 if (ind->root.type == bfd_link_hash_indirect
1011 && dir->got.refcount <= 0)
1012 {
1013 edir->tls_type = eind->tls_type;
1014 eind->tls_type = GOT_UNKNOWN;
1015 }
1016
1017 if (ELIMINATE_COPY_RELOCS
1018 && ind->root.type != bfd_link_hash_indirect
1019 && dir->dynamic_adjusted)
1020 {
1021 /* If called to transfer flags for a weakdef during processing
1022 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1023 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1024 dir->ref_dynamic |= ind->ref_dynamic;
1025 dir->ref_regular |= ind->ref_regular;
1026 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1027 dir->needs_plt |= ind->needs_plt;
1028 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1029 }
1030 else
1031 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1032 }
1033
1034 typedef union
1035 {
1036 unsigned char c[2];
1037 uint16_t i;
1038 }
1039 i386_opcode16;
1040
1041 /* Return TRUE if the TLS access code sequence support transition
1042 from R_TYPE. */
1043
1044 static bfd_boolean
1045 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1046 bfd_byte *contents,
1047 Elf_Internal_Shdr *symtab_hdr,
1048 struct elf_link_hash_entry **sym_hashes,
1049 unsigned int r_type,
1050 const Elf_Internal_Rela *rel,
1051 const Elf_Internal_Rela *relend)
1052 {
1053 unsigned int val, type;
1054 unsigned long r_symndx;
1055 struct elf_link_hash_entry *h;
1056 bfd_vma offset;
1057
1058 /* Get the section contents. */
1059 if (contents == NULL)
1060 {
1061 if (elf_section_data (sec)->this_hdr.contents != NULL)
1062 contents = elf_section_data (sec)->this_hdr.contents;
1063 else
1064 {
1065 /* FIXME: How to better handle error condition? */
1066 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1067 return FALSE;
1068
1069 /* Cache the section contents for elf_link_input_bfd. */
1070 elf_section_data (sec)->this_hdr.contents = contents;
1071 }
1072 }
1073
1074 offset = rel->r_offset;
1075 switch (r_type)
1076 {
1077 case R_386_TLS_GD:
1078 case R_386_TLS_LDM:
1079 if (offset < 2 || (rel + 1) >= relend)
1080 return FALSE;
1081
1082 type = bfd_get_8 (abfd, contents + offset - 2);
1083 if (r_type == R_386_TLS_GD)
1084 {
1085 /* Check transition from GD access model. Only
1086 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1087 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1088 can transit to different access model. */
1089 if ((offset + 10) > sec->size ||
1090 (type != 0x8d && type != 0x04))
1091 return FALSE;
1092
1093 val = bfd_get_8 (abfd, contents + offset - 1);
1094 if (type == 0x04)
1095 {
1096 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1097 if (offset < 3)
1098 return FALSE;
1099
1100 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1101 return FALSE;
1102
1103 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1104 return FALSE;
1105 }
1106 else
1107 {
1108 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1109 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1110 return FALSE;
1111
1112 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1113 return FALSE;
1114 }
1115 }
1116 else
1117 {
1118 /* Check transition from LD access model. Only
1119 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1120 can transit to different access model. */
1121 if (type != 0x8d || (offset + 9) > sec->size)
1122 return FALSE;
1123
1124 val = bfd_get_8 (abfd, contents + offset - 1);
1125 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1126 return FALSE;
1127 }
1128
1129 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1130 return FALSE;
1131
1132 r_symndx = ELF32_R_SYM (rel[1].r_info);
1133 if (r_symndx < symtab_hdr->sh_info)
1134 return FALSE;
1135
1136 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1137 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1138 may be versioned. */
1139 return (h != NULL
1140 && h->root.root.string != NULL
1141 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1142 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1143 && (strncmp (h->root.root.string, "___tls_get_addr",
1144 15) == 0));
1145
1146 case R_386_TLS_IE:
1147 /* Check transition from IE access model:
1148 movl foo@indntpoff(%rip), %eax
1149 movl foo@indntpoff(%rip), %reg
1150 addl foo@indntpoff(%rip), %reg
1151 */
1152
1153 if (offset < 1 || (offset + 4) > sec->size)
1154 return FALSE;
1155
1156 /* Check "movl foo@tpoff(%rip), %eax" first. */
1157 val = bfd_get_8 (abfd, contents + offset - 1);
1158 if (val == 0xa1)
1159 return TRUE;
1160
1161 if (offset < 2)
1162 return FALSE;
1163
1164 /* Check movl|addl foo@tpoff(%rip), %reg. */
1165 type = bfd_get_8 (abfd, contents + offset - 2);
1166 return ((type == 0x8b || type == 0x03)
1167 && (val & 0xc7) == 0x05);
1168
1169 case R_386_TLS_GOTIE:
1170 case R_386_TLS_IE_32:
1171 /* Check transition from {IE_32,GOTIE} access model:
1172 subl foo@{tpoff,gontoff}(%reg1), %reg2
1173 movl foo@{tpoff,gontoff}(%reg1), %reg2
1174 addl foo@{tpoff,gontoff}(%reg1), %reg2
1175 */
1176
1177 if (offset < 2 || (offset + 4) > sec->size)
1178 return FALSE;
1179
1180 val = bfd_get_8 (abfd, contents + offset - 1);
1181 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1182 return FALSE;
1183
1184 type = bfd_get_8 (abfd, contents + offset - 2);
1185 return type == 0x8b || type == 0x2b || type == 0x03;
1186
1187 case R_386_TLS_GOTDESC:
1188 /* Check transition from GDesc access model:
1189 leal x@tlsdesc(%ebx), %eax
1190
1191 Make sure it's a leal adding ebx to a 32-bit offset
1192 into any register, although it's probably almost always
1193 going to be eax. */
1194
1195 if (offset < 2 || (offset + 4) > sec->size)
1196 return FALSE;
1197
1198 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1199 return FALSE;
1200
1201 val = bfd_get_8 (abfd, contents + offset - 1);
1202 return (val & 0xc7) == 0x83;
1203
1204 case R_386_TLS_DESC_CALL:
1205 /* Check transition from GDesc access model:
1206 call *x@tlsdesc(%rax)
1207 */
1208 if (offset + 2 <= sec->size)
1209 {
1210 /* Make sure that it's a call *x@tlsdesc(%rax). */
1211 static i386_opcode16 call = { { 0xff, 0x10 } };
1212 return bfd_get_16 (abfd, contents + offset) == call.i;
1213 }
1214
1215 return FALSE;
1216
1217 default:
1218 abort ();
1219 }
1220 }
1221
1222 /* Return TRUE if the TLS access transition is OK or no transition
1223 will be performed. Update R_TYPE if there is a transition. */
1224
1225 static bfd_boolean
1226 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1227 asection *sec, bfd_byte *contents,
1228 Elf_Internal_Shdr *symtab_hdr,
1229 struct elf_link_hash_entry **sym_hashes,
1230 unsigned int *r_type, int tls_type,
1231 const Elf_Internal_Rela *rel,
1232 const Elf_Internal_Rela *relend,
1233 struct elf_link_hash_entry *h)
1234 {
1235 unsigned int from_type = *r_type;
1236 unsigned int to_type = from_type;
1237 bfd_boolean check = TRUE;
1238
1239 switch (from_type)
1240 {
1241 case R_386_TLS_GD:
1242 case R_386_TLS_GOTDESC:
1243 case R_386_TLS_DESC_CALL:
1244 case R_386_TLS_IE_32:
1245 case R_386_TLS_IE:
1246 case R_386_TLS_GOTIE:
1247 if (!info->shared)
1248 {
1249 if (h == NULL)
1250 to_type = R_386_TLS_LE_32;
1251 else if (from_type != R_386_TLS_IE
1252 && from_type != R_386_TLS_GOTIE)
1253 to_type = R_386_TLS_IE_32;
1254 }
1255
1256 /* When we are called from elf_i386_relocate_section, CONTENTS
1257 isn't NULL and there may be additional transitions based on
1258 TLS_TYPE. */
1259 if (contents != NULL)
1260 {
1261 unsigned int new_to_type = to_type;
1262
1263 if (!info->shared
1264 && h != NULL
1265 && h->dynindx == -1
1266 && (tls_type & GOT_TLS_IE))
1267 new_to_type = R_386_TLS_LE_32;
1268
1269 if (to_type == R_386_TLS_GD
1270 || to_type == R_386_TLS_GOTDESC
1271 || to_type == R_386_TLS_DESC_CALL)
1272 {
1273 if (tls_type == GOT_TLS_IE_POS)
1274 new_to_type = R_386_TLS_GOTIE;
1275 else if (tls_type & GOT_TLS_IE)
1276 new_to_type = R_386_TLS_IE_32;
1277 }
1278
1279 /* We checked the transition before when we were called from
1280 elf_i386_check_relocs. We only want to check the new
1281 transition which hasn't been checked before. */
1282 check = new_to_type != to_type && from_type == to_type;
1283 to_type = new_to_type;
1284 }
1285
1286 break;
1287
1288 case R_386_TLS_LDM:
1289 if (!info->shared)
1290 to_type = R_386_TLS_LE_32;
1291 break;
1292
1293 default:
1294 return TRUE;
1295 }
1296
1297 /* Return TRUE if there is no transition. */
1298 if (from_type == to_type)
1299 return TRUE;
1300
1301 /* Check if the transition can be performed. */
1302 if (check
1303 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1304 symtab_hdr, sym_hashes,
1305 from_type, rel, relend))
1306 {
1307 reloc_howto_type *from, *to;
1308
1309 from = elf_i386_rtype_to_howto (abfd, from_type);
1310 to = elf_i386_rtype_to_howto (abfd, to_type);
1311
1312 (*_bfd_error_handler)
1313 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1314 "in section `%A' failed"),
1315 abfd, sec, from->name, to->name,
1316 h ? h->root.root.string : "a local symbol",
1317 (unsigned long) rel->r_offset);
1318 bfd_set_error (bfd_error_bad_value);
1319 return FALSE;
1320 }
1321
1322 *r_type = to_type;
1323 return TRUE;
1324 }
1325
1326 /* Look through the relocs for a section during the first phase, and
1327 calculate needed space in the global offset table, procedure linkage
1328 table, and dynamic reloc sections. */
1329
1330 static bfd_boolean
1331 elf_i386_check_relocs (bfd *abfd,
1332 struct bfd_link_info *info,
1333 asection *sec,
1334 const Elf_Internal_Rela *relocs)
1335 {
1336 struct elf_i386_link_hash_table *htab;
1337 Elf_Internal_Shdr *symtab_hdr;
1338 struct elf_link_hash_entry **sym_hashes;
1339 const Elf_Internal_Rela *rel;
1340 const Elf_Internal_Rela *rel_end;
1341 asection *sreloc;
1342 Elf_Internal_Sym *isymbuf;
1343
1344 if (info->relocatable)
1345 return TRUE;
1346
1347 BFD_ASSERT (is_i386_elf (abfd));
1348
1349 htab = elf_i386_hash_table (info);
1350 symtab_hdr = &elf_symtab_hdr (abfd);
1351 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1352 sym_hashes = elf_sym_hashes (abfd);
1353
1354 sreloc = NULL;
1355
1356 rel_end = relocs + sec->reloc_count;
1357 for (rel = relocs; rel < rel_end; rel++)
1358 {
1359 unsigned int r_type;
1360 unsigned long r_symndx;
1361 struct elf_link_hash_entry *h;
1362
1363 r_symndx = ELF32_R_SYM (rel->r_info);
1364 r_type = ELF32_R_TYPE (rel->r_info);
1365
1366 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1367 {
1368 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1369 abfd,
1370 r_symndx);
1371 return FALSE;
1372 }
1373
1374 if (r_symndx < symtab_hdr->sh_info)
1375 {
1376 /* A local symbol. */
1377 Elf_Internal_Sym *isym;
1378
1379 /* Read this BFD's local symbols. */
1380 if (isymbuf == NULL)
1381 {
1382 if (isymbuf == NULL)
1383 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1384 symtab_hdr->sh_info, 0,
1385 NULL, NULL, NULL);
1386 if (isymbuf == NULL)
1387 return FALSE;
1388 }
1389
1390 /* Check relocation against local STT_GNU_IFUNC symbol. */
1391 isym = isymbuf + r_symndx;
1392 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1393 {
1394 h = elf_i386_get_local_sym_hash (htab, abfd, rel,
1395 TRUE);
1396 if (h == NULL)
1397 return FALSE;
1398
1399 /* Fake a STT_GNU_IFUNC symbol. */
1400 h->type = STT_GNU_IFUNC;
1401 h->def_regular = 1;
1402 h->ref_regular = 1;
1403 h->forced_local = 1;
1404 h->root.type = bfd_link_hash_defined;
1405 }
1406 else
1407 h = NULL;
1408 }
1409 else
1410 {
1411 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1412 while (h->root.type == bfd_link_hash_indirect
1413 || h->root.type == bfd_link_hash_warning)
1414 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1415 }
1416
1417 if (h != NULL)
1418 {
1419 /* Create the ifunc sections for static executables. If we
1420 never see an indirect function symbol nor we are building
1421 a static executable, those sections will be empty and
1422 won't appear in output. */
1423 switch (r_type)
1424 {
1425 default:
1426 break;
1427
1428 case R_386_32:
1429 case R_386_PC32:
1430 case R_386_PLT32:
1431 case R_386_GOT32:
1432 case R_386_GOTOFF:
1433 if (htab->irelifunc == NULL && htab->iplt == NULL)
1434 {
1435 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1436 return FALSE;
1437
1438 if (info->shared)
1439 {
1440 htab->irelifunc = bfd_get_section_by_name (abfd,
1441 ".rel.ifunc");
1442 if (!htab->irelifunc)
1443 abort ();
1444 }
1445 else
1446 {
1447 htab->iplt = bfd_get_section_by_name (abfd, ".iplt");
1448 htab->irelplt = bfd_get_section_by_name (abfd,
1449 ".rel.iplt");
1450 htab->igotplt = bfd_get_section_by_name (abfd,
1451 ".igot.plt");
1452 if (!htab->iplt
1453 || !htab->irelplt
1454 || !htab->igotplt)
1455 abort ();
1456 }
1457 }
1458 break;
1459 }
1460
1461 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1462 it here if it is defined in a non-shared object. */
1463 if (h->type == STT_GNU_IFUNC
1464 && h->def_regular)
1465 {
1466 /* It is referenced by a non-shared object. */
1467 h->ref_regular = 1;
1468
1469 /* STT_GNU_IFUNC symbol must go through PLT. */
1470 h->plt.refcount += 1;
1471
1472 /* STT_GNU_IFUNC needs dynamic sections. */
1473 if (htab->elf.dynobj == NULL)
1474 htab->elf.dynobj = abfd;
1475
1476 switch (r_type)
1477 {
1478 default:
1479 (*_bfd_error_handler)
1480 (_("%B: relocation %s against STT_GNU_IFUNC "
1481 "symbol `%s' isn't handled by %s"), abfd,
1482 elf_howto_table[r_type].name,
1483 (h->root.root.string
1484 ? h->root.root.string : "a local symbol"),
1485 __FUNCTION__);
1486 bfd_set_error (bfd_error_bad_value);
1487 return FALSE;
1488
1489 case R_386_32:
1490 h->non_got_ref = 1;
1491 h->pointer_equality_needed = 1;
1492 if (info->shared)
1493 {
1494 struct elf_i386_dyn_relocs *p;
1495 struct elf_i386_dyn_relocs **head;
1496
1497 /* We must copy these reloc types into the
1498 output file. Create a reloc section in
1499 dynobj and make room for this reloc. */
1500 if (sreloc == NULL)
1501 {
1502 if (htab->elf.dynobj == NULL)
1503 htab->elf.dynobj = abfd;
1504
1505 sreloc = _bfd_elf_make_dynamic_reloc_section
1506 (sec, htab->elf.dynobj, 2, abfd, FALSE);
1507
1508 if (sreloc == NULL)
1509 return FALSE;
1510 }
1511
1512 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1513 p = *head;
1514 if (p == NULL || p->sec != sec)
1515 {
1516 bfd_size_type amt = sizeof *p;
1517 p = bfd_alloc (htab->elf.dynobj, amt);
1518 if (p == NULL)
1519 return FALSE;
1520 p->next = *head;
1521 *head = p;
1522 p->sec = sec;
1523 p->count = 0;
1524 p->pc_count = 0;
1525 }
1526 p->count += 1;
1527 }
1528 break;
1529
1530 case R_386_PC32:
1531 h->non_got_ref = 1;
1532 break;
1533
1534 case R_386_PLT32:
1535 break;
1536
1537 case R_386_GOT32:
1538 case R_386_GOTOFF:
1539 h->got.refcount += 1;
1540 if (htab->sgot == NULL
1541 && !elf_i386_create_got_section (htab->elf.dynobj,
1542 info))
1543 return FALSE;
1544 break;
1545 }
1546
1547 continue;
1548 }
1549 }
1550
1551 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1552 symtab_hdr, sym_hashes,
1553 &r_type, GOT_UNKNOWN,
1554 rel, rel_end, h))
1555 return FALSE;
1556
1557 switch (r_type)
1558 {
1559 case R_386_TLS_LDM:
1560 htab->tls_ldm_got.refcount += 1;
1561 goto create_got;
1562
1563 case R_386_PLT32:
1564 /* This symbol requires a procedure linkage table entry. We
1565 actually build the entry in adjust_dynamic_symbol,
1566 because this might be a case of linking PIC code which is
1567 never referenced by a dynamic object, in which case we
1568 don't need to generate a procedure linkage table entry
1569 after all. */
1570
1571 /* If this is a local symbol, we resolve it directly without
1572 creating a procedure linkage table entry. */
1573 if (h == NULL)
1574 continue;
1575
1576 h->needs_plt = 1;
1577 h->plt.refcount += 1;
1578 break;
1579
1580 case R_386_TLS_IE_32:
1581 case R_386_TLS_IE:
1582 case R_386_TLS_GOTIE:
1583 if (info->shared)
1584 info->flags |= DF_STATIC_TLS;
1585 /* Fall through */
1586
1587 case R_386_GOT32:
1588 case R_386_TLS_GD:
1589 case R_386_TLS_GOTDESC:
1590 case R_386_TLS_DESC_CALL:
1591 /* This symbol requires a global offset table entry. */
1592 {
1593 int tls_type, old_tls_type;
1594
1595 switch (r_type)
1596 {
1597 default:
1598 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1599 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1600 case R_386_TLS_GOTDESC:
1601 case R_386_TLS_DESC_CALL:
1602 tls_type = GOT_TLS_GDESC; break;
1603 case R_386_TLS_IE_32:
1604 if (ELF32_R_TYPE (rel->r_info) == r_type)
1605 tls_type = GOT_TLS_IE_NEG;
1606 else
1607 /* If this is a GD->IE transition, we may use either of
1608 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1609 tls_type = GOT_TLS_IE;
1610 break;
1611 case R_386_TLS_IE:
1612 case R_386_TLS_GOTIE:
1613 tls_type = GOT_TLS_IE_POS; break;
1614 }
1615
1616 if (h != NULL)
1617 {
1618 h->got.refcount += 1;
1619 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1620 }
1621 else
1622 {
1623 bfd_signed_vma *local_got_refcounts;
1624
1625 /* This is a global offset table entry for a local symbol. */
1626 local_got_refcounts = elf_local_got_refcounts (abfd);
1627 if (local_got_refcounts == NULL)
1628 {
1629 bfd_size_type size;
1630
1631 size = symtab_hdr->sh_info;
1632 size *= (sizeof (bfd_signed_vma)
1633 + sizeof (bfd_vma) + sizeof(char));
1634 local_got_refcounts = bfd_zalloc (abfd, size);
1635 if (local_got_refcounts == NULL)
1636 return FALSE;
1637 elf_local_got_refcounts (abfd) = local_got_refcounts;
1638 elf_i386_local_tlsdesc_gotent (abfd)
1639 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1640 elf_i386_local_got_tls_type (abfd)
1641 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1642 }
1643 local_got_refcounts[r_symndx] += 1;
1644 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1645 }
1646
1647 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1648 tls_type |= old_tls_type;
1649 /* If a TLS symbol is accessed using IE at least once,
1650 there is no point to use dynamic model for it. */
1651 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1652 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1653 || (tls_type & GOT_TLS_IE) == 0))
1654 {
1655 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1656 tls_type = old_tls_type;
1657 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1658 && GOT_TLS_GD_ANY_P (tls_type))
1659 tls_type |= old_tls_type;
1660 else
1661 {
1662 (*_bfd_error_handler)
1663 (_("%B: `%s' accessed both as normal and "
1664 "thread local symbol"),
1665 abfd,
1666 h ? h->root.root.string : "<local>");
1667 return FALSE;
1668 }
1669 }
1670
1671 if (old_tls_type != tls_type)
1672 {
1673 if (h != NULL)
1674 elf_i386_hash_entry (h)->tls_type = tls_type;
1675 else
1676 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1677 }
1678 }
1679 /* Fall through */
1680
1681 case R_386_GOTOFF:
1682 case R_386_GOTPC:
1683 create_got:
1684 if (htab->sgot == NULL)
1685 {
1686 if (htab->elf.dynobj == NULL)
1687 htab->elf.dynobj = abfd;
1688 if (!elf_i386_create_got_section (htab->elf.dynobj, info))
1689 return FALSE;
1690 }
1691 if (r_type != R_386_TLS_IE)
1692 break;
1693 /* Fall through */
1694
1695 case R_386_TLS_LE_32:
1696 case R_386_TLS_LE:
1697 if (!info->shared)
1698 break;
1699 info->flags |= DF_STATIC_TLS;
1700 /* Fall through */
1701
1702 case R_386_32:
1703 case R_386_PC32:
1704 if (h != NULL && info->executable)
1705 {
1706 /* If this reloc is in a read-only section, we might
1707 need a copy reloc. We can't check reliably at this
1708 stage whether the section is read-only, as input
1709 sections have not yet been mapped to output sections.
1710 Tentatively set the flag for now, and correct in
1711 adjust_dynamic_symbol. */
1712 h->non_got_ref = 1;
1713
1714 /* We may need a .plt entry if the function this reloc
1715 refers to is in a shared lib. */
1716 h->plt.refcount += 1;
1717 if (r_type != R_386_PC32)
1718 h->pointer_equality_needed = 1;
1719 }
1720
1721 /* If we are creating a shared library, and this is a reloc
1722 against a global symbol, or a non PC relative reloc
1723 against a local symbol, then we need to copy the reloc
1724 into the shared library. However, if we are linking with
1725 -Bsymbolic, we do not need to copy a reloc against a
1726 global symbol which is defined in an object we are
1727 including in the link (i.e., DEF_REGULAR is set). At
1728 this point we have not seen all the input files, so it is
1729 possible that DEF_REGULAR is not set now but will be set
1730 later (it is never cleared). In case of a weak definition,
1731 DEF_REGULAR may be cleared later by a strong definition in
1732 a shared library. We account for that possibility below by
1733 storing information in the relocs_copied field of the hash
1734 table entry. A similar situation occurs when creating
1735 shared libraries and symbol visibility changes render the
1736 symbol local.
1737
1738 If on the other hand, we are creating an executable, we
1739 may need to keep relocations for symbols satisfied by a
1740 dynamic library if we manage to avoid copy relocs for the
1741 symbol. */
1742 if ((info->shared
1743 && (sec->flags & SEC_ALLOC) != 0
1744 && (r_type != R_386_PC32
1745 || (h != NULL
1746 && (! SYMBOLIC_BIND (info, h)
1747 || h->root.type == bfd_link_hash_defweak
1748 || !h->def_regular))))
1749 || (ELIMINATE_COPY_RELOCS
1750 && !info->shared
1751 && (sec->flags & SEC_ALLOC) != 0
1752 && h != NULL
1753 && (h->root.type == bfd_link_hash_defweak
1754 || !h->def_regular)))
1755 {
1756 struct elf_i386_dyn_relocs *p;
1757 struct elf_i386_dyn_relocs **head;
1758
1759 /* We must copy these reloc types into the output file.
1760 Create a reloc section in dynobj and make room for
1761 this reloc. */
1762 if (sreloc == NULL)
1763 {
1764 if (htab->elf.dynobj == NULL)
1765 htab->elf.dynobj = abfd;
1766
1767 sreloc = _bfd_elf_make_dynamic_reloc_section
1768 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1769
1770 if (sreloc == NULL)
1771 return FALSE;
1772 }
1773
1774 /* If this is a global symbol, we count the number of
1775 relocations we need for this symbol. */
1776 if (h != NULL)
1777 {
1778 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1779 }
1780 else
1781 {
1782 void **vpp;
1783 /* Track dynamic relocs needed for local syms too.
1784 We really need local syms available to do this
1785 easily. Oh well. */
1786
1787 asection *s;
1788 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1789 sec, r_symndx);
1790 if (s == NULL)
1791 return FALSE;
1792
1793 vpp = &elf_section_data (s)->local_dynrel;
1794 head = (struct elf_i386_dyn_relocs **)vpp;
1795 }
1796
1797 p = *head;
1798 if (p == NULL || p->sec != sec)
1799 {
1800 bfd_size_type amt = sizeof *p;
1801 p = bfd_alloc (htab->elf.dynobj, amt);
1802 if (p == NULL)
1803 return FALSE;
1804 p->next = *head;
1805 *head = p;
1806 p->sec = sec;
1807 p->count = 0;
1808 p->pc_count = 0;
1809 }
1810
1811 p->count += 1;
1812 if (r_type == R_386_PC32)
1813 p->pc_count += 1;
1814 }
1815 break;
1816
1817 /* This relocation describes the C++ object vtable hierarchy.
1818 Reconstruct it for later use during GC. */
1819 case R_386_GNU_VTINHERIT:
1820 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1821 return FALSE;
1822 break;
1823
1824 /* This relocation describes which C++ vtable entries are actually
1825 used. Record for later use during GC. */
1826 case R_386_GNU_VTENTRY:
1827 BFD_ASSERT (h != NULL);
1828 if (h != NULL
1829 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1830 return FALSE;
1831 break;
1832
1833 default:
1834 break;
1835 }
1836 }
1837
1838 return TRUE;
1839 }
1840
1841 /* Return the section that should be marked against GC for a given
1842 relocation. */
1843
1844 static asection *
1845 elf_i386_gc_mark_hook (asection *sec,
1846 struct bfd_link_info *info,
1847 Elf_Internal_Rela *rel,
1848 struct elf_link_hash_entry *h,
1849 Elf_Internal_Sym *sym)
1850 {
1851 if (h != NULL)
1852 switch (ELF32_R_TYPE (rel->r_info))
1853 {
1854 case R_386_GNU_VTINHERIT:
1855 case R_386_GNU_VTENTRY:
1856 return NULL;
1857 }
1858
1859 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1860 }
1861
1862 /* Update the got entry reference counts for the section being removed. */
1863
1864 static bfd_boolean
1865 elf_i386_gc_sweep_hook (bfd *abfd,
1866 struct bfd_link_info *info,
1867 asection *sec,
1868 const Elf_Internal_Rela *relocs)
1869 {
1870 Elf_Internal_Shdr *symtab_hdr;
1871 struct elf_link_hash_entry **sym_hashes;
1872 bfd_signed_vma *local_got_refcounts;
1873 const Elf_Internal_Rela *rel, *relend;
1874
1875 if (info->relocatable)
1876 return TRUE;
1877
1878 elf_section_data (sec)->local_dynrel = NULL;
1879
1880 symtab_hdr = &elf_symtab_hdr (abfd);
1881 sym_hashes = elf_sym_hashes (abfd);
1882 local_got_refcounts = elf_local_got_refcounts (abfd);
1883
1884 relend = relocs + sec->reloc_count;
1885 for (rel = relocs; rel < relend; rel++)
1886 {
1887 unsigned long r_symndx;
1888 unsigned int r_type;
1889 struct elf_link_hash_entry *h = NULL;
1890
1891 r_symndx = ELF32_R_SYM (rel->r_info);
1892 if (r_symndx >= symtab_hdr->sh_info)
1893 {
1894 struct elf_i386_link_hash_entry *eh;
1895 struct elf_i386_dyn_relocs **pp;
1896 struct elf_i386_dyn_relocs *p;
1897
1898 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1899 while (h->root.type == bfd_link_hash_indirect
1900 || h->root.type == bfd_link_hash_warning)
1901 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1902 eh = (struct elf_i386_link_hash_entry *) h;
1903
1904 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1905 if (p->sec == sec)
1906 {
1907 /* Everything must go for SEC. */
1908 *pp = p->next;
1909 break;
1910 }
1911 }
1912
1913 r_type = ELF32_R_TYPE (rel->r_info);
1914 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1915 symtab_hdr, sym_hashes,
1916 &r_type, GOT_UNKNOWN,
1917 rel, relend, h))
1918 return FALSE;
1919
1920 switch (r_type)
1921 {
1922 case R_386_TLS_LDM:
1923 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1924 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1925 break;
1926
1927 case R_386_TLS_GD:
1928 case R_386_TLS_GOTDESC:
1929 case R_386_TLS_DESC_CALL:
1930 case R_386_TLS_IE_32:
1931 case R_386_TLS_IE:
1932 case R_386_TLS_GOTIE:
1933 case R_386_GOT32:
1934 if (h != NULL)
1935 {
1936 if (h->got.refcount > 0)
1937 h->got.refcount -= 1;
1938 }
1939 else if (local_got_refcounts != NULL)
1940 {
1941 if (local_got_refcounts[r_symndx] > 0)
1942 local_got_refcounts[r_symndx] -= 1;
1943 }
1944 break;
1945
1946 case R_386_32:
1947 case R_386_PC32:
1948 if (info->shared)
1949 break;
1950 /* Fall through */
1951
1952 case R_386_PLT32:
1953 if (h != NULL)
1954 {
1955 if (h->plt.refcount > 0)
1956 h->plt.refcount -= 1;
1957 }
1958 break;
1959
1960 default:
1961 break;
1962 }
1963 }
1964
1965 return TRUE;
1966 }
1967
1968 /* Adjust a symbol defined by a dynamic object and referenced by a
1969 regular object. The current definition is in some section of the
1970 dynamic object, but we're not including those sections. We have to
1971 change the definition to something the rest of the link can
1972 understand. */
1973
1974 static bfd_boolean
1975 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1976 struct elf_link_hash_entry *h)
1977 {
1978 struct elf_i386_link_hash_table *htab;
1979 asection *s;
1980
1981 /* STT_GNU_IFUNC symbol must go through PLT. */
1982 if (h->type == STT_GNU_IFUNC)
1983 {
1984 if (h->plt.refcount <= 0)
1985 {
1986 h->plt.offset = (bfd_vma) -1;
1987 h->needs_plt = 0;
1988 }
1989 return TRUE;
1990 }
1991
1992 /* If this is a function, put it in the procedure linkage table. We
1993 will fill in the contents of the procedure linkage table later,
1994 when we know the address of the .got section. */
1995 if (h->type == STT_FUNC
1996 || h->needs_plt)
1997 {
1998 if (h->plt.refcount <= 0
1999 || SYMBOL_CALLS_LOCAL (info, h)
2000 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2001 && h->root.type == bfd_link_hash_undefweak))
2002 {
2003 /* This case can occur if we saw a PLT32 reloc in an input
2004 file, but the symbol was never referred to by a dynamic
2005 object, or if all references were garbage collected. In
2006 such a case, we don't actually need to build a procedure
2007 linkage table, and we can just do a PC32 reloc instead. */
2008 h->plt.offset = (bfd_vma) -1;
2009 h->needs_plt = 0;
2010 }
2011
2012 return TRUE;
2013 }
2014 else
2015 /* It's possible that we incorrectly decided a .plt reloc was
2016 needed for an R_386_PC32 reloc to a non-function sym in
2017 check_relocs. We can't decide accurately between function and
2018 non-function syms in check-relocs; Objects loaded later in
2019 the link may change h->type. So fix it now. */
2020 h->plt.offset = (bfd_vma) -1;
2021
2022 /* If this is a weak symbol, and there is a real definition, the
2023 processor independent code will have arranged for us to see the
2024 real definition first, and we can just use the same value. */
2025 if (h->u.weakdef != NULL)
2026 {
2027 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2028 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2029 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2030 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2031 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2032 h->non_got_ref = h->u.weakdef->non_got_ref;
2033 return TRUE;
2034 }
2035
2036 /* This is a reference to a symbol defined by a dynamic object which
2037 is not a function. */
2038
2039 /* If we are creating a shared library, we must presume that the
2040 only references to the symbol are via the global offset table.
2041 For such cases we need not do anything here; the relocations will
2042 be handled correctly by relocate_section. */
2043 if (info->shared)
2044 return TRUE;
2045
2046 /* If there are no references to this symbol that do not use the
2047 GOT, we don't need to generate a copy reloc. */
2048 if (!h->non_got_ref)
2049 return TRUE;
2050
2051 /* If -z nocopyreloc was given, we won't generate them either. */
2052 if (info->nocopyreloc)
2053 {
2054 h->non_got_ref = 0;
2055 return TRUE;
2056 }
2057
2058 htab = elf_i386_hash_table (info);
2059
2060 /* If there aren't any dynamic relocs in read-only sections, then
2061 we can keep the dynamic relocs and avoid the copy reloc. This
2062 doesn't work on VxWorks, where we can not have dynamic relocations
2063 (other than copy and jump slot relocations) in an executable. */
2064 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
2065 {
2066 struct elf_i386_link_hash_entry * eh;
2067 struct elf_i386_dyn_relocs *p;
2068
2069 eh = (struct elf_i386_link_hash_entry *) h;
2070 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2071 {
2072 s = p->sec->output_section;
2073 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2074 break;
2075 }
2076
2077 if (p == NULL)
2078 {
2079 h->non_got_ref = 0;
2080 return TRUE;
2081 }
2082 }
2083
2084 if (h->size == 0)
2085 {
2086 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
2087 h->root.root.string);
2088 return TRUE;
2089 }
2090
2091 /* We must allocate the symbol in our .dynbss section, which will
2092 become part of the .bss section of the executable. There will be
2093 an entry for this symbol in the .dynsym section. The dynamic
2094 object will contain position independent code, so all references
2095 from the dynamic object to this symbol will go through the global
2096 offset table. The dynamic linker will use the .dynsym entry to
2097 determine the address it must put in the global offset table, so
2098 both the dynamic object and the regular object will refer to the
2099 same memory location for the variable. */
2100
2101 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2102 copy the initial value out of the dynamic object and into the
2103 runtime process image. */
2104 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2105 {
2106 htab->srelbss->size += sizeof (Elf32_External_Rel);
2107 h->needs_copy = 1;
2108 }
2109
2110 s = htab->sdynbss;
2111
2112 return _bfd_elf_adjust_dynamic_copy (h, s);
2113 }
2114
2115 /* Allocate space in .plt, .got and associated reloc sections for
2116 dynamic relocs. */
2117
2118 static bfd_boolean
2119 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2120 {
2121 struct bfd_link_info *info;
2122 struct elf_i386_link_hash_table *htab;
2123 struct elf_i386_link_hash_entry *eh;
2124 struct elf_i386_dyn_relocs *p;
2125
2126 if (h->root.type == bfd_link_hash_indirect)
2127 return TRUE;
2128
2129 if (h->root.type == bfd_link_hash_warning)
2130 /* When warning symbols are created, they **replace** the "real"
2131 entry in the hash table, thus we never get to see the real
2132 symbol in a hash traversal. So look at it now. */
2133 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2134 eh = (struct elf_i386_link_hash_entry *) h;
2135
2136 info = (struct bfd_link_info *) inf;
2137 htab = elf_i386_hash_table (info);
2138
2139 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2140 here if it is defined and referenced in a non-shared object. */
2141 if (h->type == STT_GNU_IFUNC
2142 && h->def_regular)
2143 {
2144 asection *plt, *gotplt, *relplt;
2145
2146 /* Return and discard space for dynamic relocations against it if
2147 it is never referenced in a non-shared object. */
2148 if (!h->ref_regular)
2149 {
2150 if (h->plt.refcount > 0
2151 || h->got.refcount > 0)
2152 abort ();
2153 h->got.offset = (bfd_vma) -1;
2154 eh->dyn_relocs = NULL;
2155 return TRUE;
2156 }
2157
2158 /* When building a static executable, use .iplt, .igot.plt and
2159 .rel.iplt sections for STT_GNU_IFUNC symbols. */
2160 if (htab->splt != NULL)
2161 {
2162 plt = htab->splt;
2163 gotplt = htab->sgotplt;
2164 relplt = htab->srelplt;
2165
2166 /* If this is the first .plt entry, make room for the special
2167 first entry. */
2168 if (plt->size == 0)
2169 plt->size += PLT_ENTRY_SIZE;
2170 }
2171 else
2172 {
2173 plt = htab->iplt;
2174 gotplt = htab->igotplt;
2175 relplt = htab->irelplt;
2176 }
2177
2178 /* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
2179 the original value for R_386_IRELATIVE. */
2180 h->plt.offset = plt->size;
2181
2182 /* Make room for this entry in the .plt/.iplt section. */
2183 plt->size += PLT_ENTRY_SIZE;
2184
2185 /* We also need to make an entry in the .got.plt/.got.iplt
2186 section, which will be placed in the .got section by the
2187 linker script. */
2188 gotplt->size += 4;
2189
2190 /* We also need to make an entry in the .rela.plt/.rela.iplt
2191 section. */
2192 relplt->size += sizeof (Elf32_External_Rel);
2193 relplt->reloc_count++;
2194
2195 /* We need dynamic relocation for STT_GNU_IFUNC symbol only
2196 when there is a non-GOT reference in a shared object. */
2197 if (!info->shared
2198 || !h->non_got_ref)
2199 eh->dyn_relocs = NULL;
2200
2201 /* Finally, allocate space. */
2202 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2203 htab->irelifunc->size += p->count * sizeof (Elf32_External_Rel);
2204
2205 /* For STT_GNU_IFUNC symbol, .got.plt has the real function
2206 addres and .got has the PLT entry adddress. We will load
2207 the GOT entry with the PLT entry in finish_dynamic_symbol if
2208 it is used. For branch, it uses .got.plt. For symbol value,
2209 1. Use .got.plt in a shared object if it is forced local or
2210 not dynamic.
2211 2. Use .got.plt in a non-shared object if pointer equality
2212 isn't needed.
2213 3. Use .got.plt if .got isn't used.
2214 4. Otherwise use .got so that it can be shared among different
2215 objects at run-time.
2216 We only need to relocate .got entry in shared object. */
2217 if ((info->shared
2218 && (h->dynindx == -1
2219 || h->forced_local))
2220 || (!info->shared
2221 && !h->pointer_equality_needed)
2222 || htab->sgot == NULL)
2223 {
2224 /* Use .got.plt. */
2225 h->got.offset = (bfd_vma) -1;
2226 }
2227 else
2228 {
2229 h->got.offset = htab->sgot->size;
2230 htab->sgot->size += 4;
2231 if (info->shared)
2232 htab->srelgot->size += sizeof (Elf32_External_Rel);
2233 }
2234
2235 return TRUE;
2236 }
2237 else if (htab->elf.dynamic_sections_created
2238 && h->plt.refcount > 0)
2239 {
2240 /* Make sure this symbol is output as a dynamic symbol.
2241 Undefined weak syms won't yet be marked as dynamic. */
2242 if (h->dynindx == -1
2243 && !h->forced_local)
2244 {
2245 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2246 return FALSE;
2247 }
2248
2249 if (info->shared
2250 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2251 {
2252 asection *s = htab->splt;
2253
2254 /* If this is the first .plt entry, make room for the special
2255 first entry. */
2256 if (s->size == 0)
2257 s->size += PLT_ENTRY_SIZE;
2258
2259 h->plt.offset = s->size;
2260
2261 /* If this symbol is not defined in a regular file, and we are
2262 not generating a shared library, then set the symbol to this
2263 location in the .plt. This is required to make function
2264 pointers compare as equal between the normal executable and
2265 the shared library. */
2266 if (! info->shared
2267 && !h->def_regular)
2268 {
2269 h->root.u.def.section = s;
2270 h->root.u.def.value = h->plt.offset;
2271 }
2272
2273 /* Make room for this entry. */
2274 s->size += PLT_ENTRY_SIZE;
2275
2276 /* We also need to make an entry in the .got.plt section, which
2277 will be placed in the .got section by the linker script. */
2278 htab->sgotplt->size += 4;
2279
2280 /* We also need to make an entry in the .rel.plt section. */
2281 htab->srelplt->size += sizeof (Elf32_External_Rel);
2282 htab->next_tls_desc_index++;
2283
2284 if (htab->is_vxworks && !info->shared)
2285 {
2286 /* VxWorks has a second set of relocations for each PLT entry
2287 in executables. They go in a separate relocation section,
2288 which is processed by the kernel loader. */
2289
2290 /* There are two relocations for the initial PLT entry: an
2291 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2292 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2293
2294 if (h->plt.offset == PLT_ENTRY_SIZE)
2295 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2296
2297 /* There are two extra relocations for each subsequent PLT entry:
2298 an R_386_32 relocation for the GOT entry, and an R_386_32
2299 relocation for the PLT entry. */
2300
2301 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2302 }
2303 }
2304 else
2305 {
2306 h->plt.offset = (bfd_vma) -1;
2307 h->needs_plt = 0;
2308 }
2309 }
2310 else
2311 {
2312 h->plt.offset = (bfd_vma) -1;
2313 h->needs_plt = 0;
2314 }
2315
2316 eh->tlsdesc_got = (bfd_vma) -1;
2317
2318 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2319 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2320 if (h->got.refcount > 0
2321 && !info->shared
2322 && h->dynindx == -1
2323 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2324 h->got.offset = (bfd_vma) -1;
2325 else if (h->got.refcount > 0)
2326 {
2327 asection *s;
2328 bfd_boolean dyn;
2329 int tls_type = elf_i386_hash_entry(h)->tls_type;
2330
2331 /* Make sure this symbol is output as a dynamic symbol.
2332 Undefined weak syms won't yet be marked as dynamic. */
2333 if (h->dynindx == -1
2334 && !h->forced_local)
2335 {
2336 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2337 return FALSE;
2338 }
2339
2340 s = htab->sgot;
2341 if (GOT_TLS_GDESC_P (tls_type))
2342 {
2343 eh->tlsdesc_got = htab->sgotplt->size
2344 - elf_i386_compute_jump_table_size (htab);
2345 htab->sgotplt->size += 8;
2346 h->got.offset = (bfd_vma) -2;
2347 }
2348 if (! GOT_TLS_GDESC_P (tls_type)
2349 || GOT_TLS_GD_P (tls_type))
2350 {
2351 h->got.offset = s->size;
2352 s->size += 4;
2353 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2354 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2355 s->size += 4;
2356 }
2357 dyn = htab->elf.dynamic_sections_created;
2358 /* R_386_TLS_IE_32 needs one dynamic relocation,
2359 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2360 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2361 need two), R_386_TLS_GD needs one if local symbol and two if
2362 global. */
2363 if (tls_type == GOT_TLS_IE_BOTH)
2364 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
2365 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2366 || (tls_type & GOT_TLS_IE))
2367 htab->srelgot->size += sizeof (Elf32_External_Rel);
2368 else if (GOT_TLS_GD_P (tls_type))
2369 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
2370 else if (! GOT_TLS_GDESC_P (tls_type)
2371 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2372 || h->root.type != bfd_link_hash_undefweak)
2373 && (info->shared
2374 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2375 htab->srelgot->size += sizeof (Elf32_External_Rel);
2376 if (GOT_TLS_GDESC_P (tls_type))
2377 htab->srelplt->size += sizeof (Elf32_External_Rel);
2378 }
2379 else
2380 h->got.offset = (bfd_vma) -1;
2381
2382 if (eh->dyn_relocs == NULL)
2383 return TRUE;
2384
2385 /* In the shared -Bsymbolic case, discard space allocated for
2386 dynamic pc-relative relocs against symbols which turn out to be
2387 defined in regular objects. For the normal shared case, discard
2388 space for pc-relative relocs that have become local due to symbol
2389 visibility changes. */
2390
2391 if (info->shared)
2392 {
2393 /* The only reloc that uses pc_count is R_386_PC32, which will
2394 appear on a call or on something like ".long foo - .". We
2395 want calls to protected symbols to resolve directly to the
2396 function rather than going via the plt. If people want
2397 function pointer comparisons to work as expected then they
2398 should avoid writing assembly like ".long foo - .". */
2399 if (SYMBOL_CALLS_LOCAL (info, h))
2400 {
2401 struct elf_i386_dyn_relocs **pp;
2402
2403 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2404 {
2405 p->count -= p->pc_count;
2406 p->pc_count = 0;
2407 if (p->count == 0)
2408 *pp = p->next;
2409 else
2410 pp = &p->next;
2411 }
2412 }
2413
2414 if (htab->is_vxworks)
2415 {
2416 struct elf_i386_dyn_relocs **pp;
2417 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2418 {
2419 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2420 *pp = p->next;
2421 else
2422 pp = &p->next;
2423 }
2424 }
2425
2426 /* Also discard relocs on undefined weak syms with non-default
2427 visibility. */
2428 if (eh->dyn_relocs != NULL
2429 && h->root.type == bfd_link_hash_undefweak)
2430 {
2431 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2432 eh->dyn_relocs = NULL;
2433
2434 /* Make sure undefined weak symbols are output as a dynamic
2435 symbol in PIEs. */
2436 else if (h->dynindx == -1
2437 && !h->forced_local)
2438 {
2439 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2440 return FALSE;
2441 }
2442 }
2443 }
2444 else if (ELIMINATE_COPY_RELOCS)
2445 {
2446 /* For the non-shared case, discard space for relocs against
2447 symbols which turn out to need copy relocs or are not
2448 dynamic. */
2449
2450 if (!h->non_got_ref
2451 && ((h->def_dynamic
2452 && !h->def_regular)
2453 || (htab->elf.dynamic_sections_created
2454 && (h->root.type == bfd_link_hash_undefweak
2455 || h->root.type == bfd_link_hash_undefined))))
2456 {
2457 /* Make sure this symbol is output as a dynamic symbol.
2458 Undefined weak syms won't yet be marked as dynamic. */
2459 if (h->dynindx == -1
2460 && !h->forced_local)
2461 {
2462 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2463 return FALSE;
2464 }
2465
2466 /* If that succeeded, we know we'll be keeping all the
2467 relocs. */
2468 if (h->dynindx != -1)
2469 goto keep;
2470 }
2471
2472 eh->dyn_relocs = NULL;
2473
2474 keep: ;
2475 }
2476
2477 /* Finally, allocate space. */
2478 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2479 {
2480 asection *sreloc;
2481
2482 sreloc = elf_section_data (p->sec)->sreloc;
2483
2484 BFD_ASSERT (sreloc != NULL);
2485 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2486 }
2487
2488 return TRUE;
2489 }
2490
2491 /* Allocate space in .plt, .got and associated reloc sections for
2492 local dynamic relocs. */
2493
2494 static bfd_boolean
2495 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2496 {
2497 struct elf_link_hash_entry *h
2498 = (struct elf_link_hash_entry *) *slot;
2499
2500 if (h->type != STT_GNU_IFUNC
2501 || !h->def_regular
2502 || !h->ref_regular
2503 || !h->forced_local
2504 || h->root.type != bfd_link_hash_defined)
2505 abort ();
2506
2507 return elf_i386_allocate_dynrelocs (h, inf);
2508 }
2509
2510 /* Find any dynamic relocs that apply to read-only sections. */
2511
2512 static bfd_boolean
2513 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2514 {
2515 struct elf_i386_link_hash_entry *eh;
2516 struct elf_i386_dyn_relocs *p;
2517
2518 if (h->root.type == bfd_link_hash_warning)
2519 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2520
2521 eh = (struct elf_i386_link_hash_entry *) h;
2522 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2523 {
2524 asection *s = p->sec->output_section;
2525
2526 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2527 {
2528 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2529
2530 info->flags |= DF_TEXTREL;
2531
2532 /* Not an error, just cut short the traversal. */
2533 return FALSE;
2534 }
2535 }
2536 return TRUE;
2537 }
2538
2539 /* Set the sizes of the dynamic sections. */
2540
2541 static bfd_boolean
2542 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2543 struct bfd_link_info *info)
2544 {
2545 struct elf_i386_link_hash_table *htab;
2546 bfd *dynobj;
2547 asection *s;
2548 bfd_boolean relocs;
2549 bfd *ibfd;
2550
2551 htab = elf_i386_hash_table (info);
2552 dynobj = htab->elf.dynobj;
2553 if (dynobj == NULL)
2554 abort ();
2555
2556 if (htab->elf.dynamic_sections_created)
2557 {
2558 /* Set the contents of the .interp section to the interpreter. */
2559 if (info->executable)
2560 {
2561 s = bfd_get_section_by_name (dynobj, ".interp");
2562 if (s == NULL)
2563 abort ();
2564 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2565 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2566 }
2567 }
2568
2569 /* Set up .got offsets for local syms, and space for local dynamic
2570 relocs. */
2571 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2572 {
2573 bfd_signed_vma *local_got;
2574 bfd_signed_vma *end_local_got;
2575 char *local_tls_type;
2576 bfd_vma *local_tlsdesc_gotent;
2577 bfd_size_type locsymcount;
2578 Elf_Internal_Shdr *symtab_hdr;
2579 asection *srel;
2580
2581 if (! is_i386_elf (ibfd))
2582 continue;
2583
2584 for (s = ibfd->sections; s != NULL; s = s->next)
2585 {
2586 struct elf_i386_dyn_relocs *p;
2587
2588 for (p = ((struct elf_i386_dyn_relocs *)
2589 elf_section_data (s)->local_dynrel);
2590 p != NULL;
2591 p = p->next)
2592 {
2593 if (!bfd_is_abs_section (p->sec)
2594 && bfd_is_abs_section (p->sec->output_section))
2595 {
2596 /* Input section has been discarded, either because
2597 it is a copy of a linkonce section or due to
2598 linker script /DISCARD/, so we'll be discarding
2599 the relocs too. */
2600 }
2601 else if (htab->is_vxworks
2602 && strcmp (p->sec->output_section->name,
2603 ".tls_vars") == 0)
2604 {
2605 /* Relocations in vxworks .tls_vars sections are
2606 handled specially by the loader. */
2607 }
2608 else if (p->count != 0)
2609 {
2610 srel = elf_section_data (p->sec)->sreloc;
2611 srel->size += p->count * sizeof (Elf32_External_Rel);
2612 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2613 info->flags |= DF_TEXTREL;
2614 }
2615 }
2616 }
2617
2618 local_got = elf_local_got_refcounts (ibfd);
2619 if (!local_got)
2620 continue;
2621
2622 symtab_hdr = &elf_symtab_hdr (ibfd);
2623 locsymcount = symtab_hdr->sh_info;
2624 end_local_got = local_got + locsymcount;
2625 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2626 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2627 s = htab->sgot;
2628 srel = htab->srelgot;
2629 for (; local_got < end_local_got;
2630 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2631 {
2632 *local_tlsdesc_gotent = (bfd_vma) -1;
2633 if (*local_got > 0)
2634 {
2635 if (GOT_TLS_GDESC_P (*local_tls_type))
2636 {
2637 *local_tlsdesc_gotent = htab->sgotplt->size
2638 - elf_i386_compute_jump_table_size (htab);
2639 htab->sgotplt->size += 8;
2640 *local_got = (bfd_vma) -2;
2641 }
2642 if (! GOT_TLS_GDESC_P (*local_tls_type)
2643 || GOT_TLS_GD_P (*local_tls_type))
2644 {
2645 *local_got = s->size;
2646 s->size += 4;
2647 if (GOT_TLS_GD_P (*local_tls_type)
2648 || *local_tls_type == GOT_TLS_IE_BOTH)
2649 s->size += 4;
2650 }
2651 if (info->shared
2652 || GOT_TLS_GD_ANY_P (*local_tls_type)
2653 || (*local_tls_type & GOT_TLS_IE))
2654 {
2655 if (*local_tls_type == GOT_TLS_IE_BOTH)
2656 srel->size += 2 * sizeof (Elf32_External_Rel);
2657 else if (GOT_TLS_GD_P (*local_tls_type)
2658 || ! GOT_TLS_GDESC_P (*local_tls_type))
2659 srel->size += sizeof (Elf32_External_Rel);
2660 if (GOT_TLS_GDESC_P (*local_tls_type))
2661 htab->srelplt->size += sizeof (Elf32_External_Rel);
2662 }
2663 }
2664 else
2665 *local_got = (bfd_vma) -1;
2666 }
2667 }
2668
2669 if (htab->tls_ldm_got.refcount > 0)
2670 {
2671 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2672 relocs. */
2673 htab->tls_ldm_got.offset = htab->sgot->size;
2674 htab->sgot->size += 8;
2675 htab->srelgot->size += sizeof (Elf32_External_Rel);
2676 }
2677 else
2678 htab->tls_ldm_got.offset = -1;
2679
2680 /* Allocate global sym .plt and .got entries, and space for global
2681 sym dynamic relocs. */
2682 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2683
2684 /* Allocate .plt and .got entries, and space for local symbols. */
2685 htab_traverse (htab->loc_hash_table,
2686 elf_i386_allocate_local_dynrelocs,
2687 info);
2688
2689 /* For every jump slot reserved in the sgotplt, reloc_count is
2690 incremented. However, when we reserve space for TLS descriptors,
2691 it's not incremented, so in order to compute the space reserved
2692 for them, it suffices to multiply the reloc count by the jump
2693 slot size. */
2694 if (htab->srelplt)
2695 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2696
2697 /* We now have determined the sizes of the various dynamic sections.
2698 Allocate memory for them. */
2699 relocs = FALSE;
2700 for (s = dynobj->sections; s != NULL; s = s->next)
2701 {
2702 bfd_boolean strip_section = TRUE;
2703
2704 if ((s->flags & SEC_LINKER_CREATED) == 0)
2705 continue;
2706
2707 if (s == htab->splt
2708 || s == htab->sgot
2709 || s == htab->sgotplt
2710 || s == htab->iplt
2711 || s == htab->igotplt
2712 || s == htab->sdynbss)
2713 {
2714 /* Strip this section if we don't need it; see the
2715 comment below. */
2716 /* We'd like to strip these sections if they aren't needed, but if
2717 we've exported dynamic symbols from them we must leave them.
2718 It's too late to tell BFD to get rid of the symbols. */
2719
2720 if (htab->elf.hplt != NULL)
2721 strip_section = FALSE;
2722 }
2723 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2724 {
2725 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
2726 relocs = TRUE;
2727
2728 /* We use the reloc_count field as a counter if we need
2729 to copy relocs into the output file. */
2730 s->reloc_count = 0;
2731 }
2732 else
2733 {
2734 /* It's not one of our sections, so don't allocate space. */
2735 continue;
2736 }
2737
2738 if (s->size == 0)
2739 {
2740 /* If we don't need this section, strip it from the
2741 output file. This is mostly to handle .rel.bss and
2742 .rel.plt. We must create both sections in
2743 create_dynamic_sections, because they must be created
2744 before the linker maps input sections to output
2745 sections. The linker does that before
2746 adjust_dynamic_symbol is called, and it is that
2747 function which decides whether anything needs to go
2748 into these sections. */
2749 if (strip_section)
2750 s->flags |= SEC_EXCLUDE;
2751 continue;
2752 }
2753
2754 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2755 continue;
2756
2757 /* Allocate memory for the section contents. We use bfd_zalloc
2758 here in case unused entries are not reclaimed before the
2759 section's contents are written out. This should not happen,
2760 but this way if it does, we get a R_386_NONE reloc instead
2761 of garbage. */
2762 s->contents = bfd_zalloc (dynobj, s->size);
2763 if (s->contents == NULL)
2764 return FALSE;
2765 }
2766
2767 if (htab->elf.dynamic_sections_created)
2768 {
2769 /* Add some entries to the .dynamic section. We fill in the
2770 values later, in elf_i386_finish_dynamic_sections, but we
2771 must add the entries now so that we get the correct size for
2772 the .dynamic section. The DT_DEBUG entry is filled in by the
2773 dynamic linker and used by the debugger. */
2774 #define add_dynamic_entry(TAG, VAL) \
2775 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2776
2777 if (info->executable)
2778 {
2779 if (!add_dynamic_entry (DT_DEBUG, 0))
2780 return FALSE;
2781 }
2782
2783 if (htab->splt->size != 0)
2784 {
2785 if (!add_dynamic_entry (DT_PLTGOT, 0)
2786 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2787 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2788 || !add_dynamic_entry (DT_JMPREL, 0))
2789 return FALSE;
2790 }
2791
2792 if (relocs)
2793 {
2794 if (!add_dynamic_entry (DT_REL, 0)
2795 || !add_dynamic_entry (DT_RELSZ, 0)
2796 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2797 return FALSE;
2798
2799 /* If any dynamic relocs apply to a read-only section,
2800 then we need a DT_TEXTREL entry. */
2801 if ((info->flags & DF_TEXTREL) == 0)
2802 elf_link_hash_traverse (&htab->elf,
2803 elf_i386_readonly_dynrelocs, info);
2804
2805 if ((info->flags & DF_TEXTREL) != 0)
2806 {
2807 if (!add_dynamic_entry (DT_TEXTREL, 0))
2808 return FALSE;
2809 }
2810 }
2811 if (htab->is_vxworks
2812 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2813 return FALSE;
2814 }
2815 #undef add_dynamic_entry
2816
2817 return TRUE;
2818 }
2819
2820 static bfd_boolean
2821 elf_i386_always_size_sections (bfd *output_bfd,
2822 struct bfd_link_info *info)
2823 {
2824 asection *tls_sec = elf_hash_table (info)->tls_sec;
2825
2826 if (tls_sec)
2827 {
2828 struct elf_link_hash_entry *tlsbase;
2829
2830 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2831 "_TLS_MODULE_BASE_",
2832 FALSE, FALSE, FALSE);
2833
2834 if (tlsbase && tlsbase->type == STT_TLS)
2835 {
2836 struct bfd_link_hash_entry *bh = NULL;
2837 const struct elf_backend_data *bed
2838 = get_elf_backend_data (output_bfd);
2839
2840 if (!(_bfd_generic_link_add_one_symbol
2841 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2842 tls_sec, 0, NULL, FALSE,
2843 bed->collect, &bh)))
2844 return FALSE;
2845
2846 elf_i386_hash_table (info)->tls_module_base = bh;
2847
2848 tlsbase = (struct elf_link_hash_entry *)bh;
2849 tlsbase->def_regular = 1;
2850 tlsbase->other = STV_HIDDEN;
2851 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2852 }
2853 }
2854
2855 return TRUE;
2856 }
2857
2858 /* Set the correct type for an x86 ELF section. We do this by the
2859 section name, which is a hack, but ought to work. */
2860
2861 static bfd_boolean
2862 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2863 Elf_Internal_Shdr *hdr,
2864 asection *sec)
2865 {
2866 register const char *name;
2867
2868 name = bfd_get_section_name (abfd, sec);
2869
2870 /* This is an ugly, but unfortunately necessary hack that is
2871 needed when producing EFI binaries on x86. It tells
2872 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2873 containing ELF relocation info. We need this hack in order to
2874 be able to generate ELF binaries that can be translated into
2875 EFI applications (which are essentially COFF objects). Those
2876 files contain a COFF ".reloc" section inside an ELFNN object,
2877 which would normally cause BFD to segfault because it would
2878 attempt to interpret this section as containing relocation
2879 entries for section "oc". With this hack enabled, ".reloc"
2880 will be treated as a normal data section, which will avoid the
2881 segfault. However, you won't be able to create an ELFNN binary
2882 with a section named "oc" that needs relocations, but that's
2883 the kind of ugly side-effects you get when detecting section
2884 types based on their names... In practice, this limitation is
2885 unlikely to bite. */
2886 if (strcmp (name, ".reloc") == 0)
2887 hdr->sh_type = SHT_PROGBITS;
2888
2889 return TRUE;
2890 }
2891
2892 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2893 executables. Rather than setting it to the beginning of the TLS
2894 section, we have to set it to the end. This function may be called
2895 multiple times, it is idempotent. */
2896
2897 static void
2898 elf_i386_set_tls_module_base (struct bfd_link_info *info)
2899 {
2900 struct bfd_link_hash_entry *base;
2901
2902 if (!info->executable)
2903 return;
2904
2905 base = elf_i386_hash_table (info)->tls_module_base;
2906
2907 if (!base)
2908 return;
2909
2910 base->u.def.value = elf_hash_table (info)->tls_size;
2911 }
2912
2913 /* Return the base VMA address which should be subtracted from real addresses
2914 when resolving @dtpoff relocation.
2915 This is PT_TLS segment p_vaddr. */
2916
2917 static bfd_vma
2918 elf_i386_dtpoff_base (struct bfd_link_info *info)
2919 {
2920 /* If tls_sec is NULL, we should have signalled an error already. */
2921 if (elf_hash_table (info)->tls_sec == NULL)
2922 return 0;
2923 return elf_hash_table (info)->tls_sec->vma;
2924 }
2925
2926 /* Return the relocation value for @tpoff relocation
2927 if STT_TLS virtual address is ADDRESS. */
2928
2929 static bfd_vma
2930 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2931 {
2932 struct elf_link_hash_table *htab = elf_hash_table (info);
2933
2934 /* If tls_sec is NULL, we should have signalled an error already. */
2935 if (htab->tls_sec == NULL)
2936 return 0;
2937 return htab->tls_size + htab->tls_sec->vma - address;
2938 }
2939
2940 /* Relocate an i386 ELF section. */
2941
2942 static bfd_boolean
2943 elf_i386_relocate_section (bfd *output_bfd,
2944 struct bfd_link_info *info,
2945 bfd *input_bfd,
2946 asection *input_section,
2947 bfd_byte *contents,
2948 Elf_Internal_Rela *relocs,
2949 Elf_Internal_Sym *local_syms,
2950 asection **local_sections)
2951 {
2952 struct elf_i386_link_hash_table *htab;
2953 Elf_Internal_Shdr *symtab_hdr;
2954 struct elf_link_hash_entry **sym_hashes;
2955 bfd_vma *local_got_offsets;
2956 bfd_vma *local_tlsdesc_gotents;
2957 Elf_Internal_Rela *rel;
2958 Elf_Internal_Rela *relend;
2959 bfd_boolean is_vxworks_tls;
2960
2961 BFD_ASSERT (is_i386_elf (input_bfd));
2962
2963 htab = elf_i386_hash_table (info);
2964 symtab_hdr = &elf_symtab_hdr (input_bfd);
2965 sym_hashes = elf_sym_hashes (input_bfd);
2966 local_got_offsets = elf_local_got_offsets (input_bfd);
2967 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2968 /* We have to handle relocations in vxworks .tls_vars sections
2969 specially, because the dynamic loader is 'weird'. */
2970 is_vxworks_tls = (htab->is_vxworks && info->shared
2971 && !strcmp (input_section->output_section->name,
2972 ".tls_vars"));
2973
2974 elf_i386_set_tls_module_base (info);
2975
2976 rel = relocs;
2977 relend = relocs + input_section->reloc_count;
2978 for (; rel < relend; rel++)
2979 {
2980 unsigned int r_type;
2981 reloc_howto_type *howto;
2982 unsigned long r_symndx;
2983 struct elf_link_hash_entry *h;
2984 Elf_Internal_Sym *sym;
2985 asection *sec;
2986 bfd_vma off, offplt;
2987 bfd_vma relocation;
2988 bfd_boolean unresolved_reloc;
2989 bfd_reloc_status_type r;
2990 unsigned int indx;
2991 int tls_type;
2992
2993 r_type = ELF32_R_TYPE (rel->r_info);
2994 if (r_type == R_386_GNU_VTINHERIT
2995 || r_type == R_386_GNU_VTENTRY)
2996 continue;
2997
2998 if ((indx = r_type) >= R_386_standard
2999 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3000 >= R_386_ext - R_386_standard)
3001 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3002 >= R_386_irelative - R_386_ext))
3003 {
3004 (*_bfd_error_handler)
3005 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3006 input_bfd, input_section, r_type);
3007 bfd_set_error (bfd_error_bad_value);
3008 return FALSE;
3009 }
3010 howto = elf_howto_table + indx;
3011
3012 r_symndx = ELF32_R_SYM (rel->r_info);
3013 h = NULL;
3014 sym = NULL;
3015 sec = NULL;
3016 unresolved_reloc = FALSE;
3017 if (r_symndx < symtab_hdr->sh_info)
3018 {
3019 sym = local_syms + r_symndx;
3020 sec = local_sections[r_symndx];
3021 relocation = (sec->output_section->vma
3022 + sec->output_offset
3023 + sym->st_value);
3024
3025 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3026 && ((sec->flags & SEC_MERGE) != 0
3027 || (info->relocatable
3028 && sec->output_offset != 0)))
3029 {
3030 bfd_vma addend;
3031 bfd_byte *where = contents + rel->r_offset;
3032
3033 switch (howto->size)
3034 {
3035 case 0:
3036 addend = bfd_get_8 (input_bfd, where);
3037 if (howto->pc_relative)
3038 {
3039 addend = (addend ^ 0x80) - 0x80;
3040 addend += 1;
3041 }
3042 break;
3043 case 1:
3044 addend = bfd_get_16 (input_bfd, where);
3045 if (howto->pc_relative)
3046 {
3047 addend = (addend ^ 0x8000) - 0x8000;
3048 addend += 2;
3049 }
3050 break;
3051 case 2:
3052 addend = bfd_get_32 (input_bfd, where);
3053 if (howto->pc_relative)
3054 {
3055 addend = (addend ^ 0x80000000) - 0x80000000;
3056 addend += 4;
3057 }
3058 break;
3059 default:
3060 abort ();
3061 }
3062
3063 if (info->relocatable)
3064 addend += sec->output_offset;
3065 else
3066 {
3067 asection *msec = sec;
3068 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3069 addend);
3070 addend -= relocation;
3071 addend += msec->output_section->vma + msec->output_offset;
3072 }
3073
3074 switch (howto->size)
3075 {
3076 case 0:
3077 /* FIXME: overflow checks. */
3078 if (howto->pc_relative)
3079 addend -= 1;
3080 bfd_put_8 (input_bfd, addend, where);
3081 break;
3082 case 1:
3083 if (howto->pc_relative)
3084 addend -= 2;
3085 bfd_put_16 (input_bfd, addend, where);
3086 break;
3087 case 2:
3088 if (howto->pc_relative)
3089 addend -= 4;
3090 bfd_put_32 (input_bfd, addend, where);
3091 break;
3092 }
3093 }
3094 else if (ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3095 {
3096 /* Relocate against local STT_GNU_IFUNC symbol. */
3097 h = elf_i386_get_local_sym_hash (htab, input_bfd,
3098 rel, FALSE);
3099 if (h == NULL)
3100 abort ();
3101
3102 /* Set STT_GNU_IFUNC symbol value. */
3103 h->root.u.def.value = sym->st_value;
3104 h->root.u.def.section = sec;
3105 }
3106 }
3107 else
3108 {
3109 bfd_boolean warned;
3110
3111 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3112 r_symndx, symtab_hdr, sym_hashes,
3113 h, sec, relocation,
3114 unresolved_reloc, warned);
3115 }
3116
3117 if (sec != NULL && elf_discarded_section (sec))
3118 {
3119 /* For relocs against symbols from removed linkonce sections,
3120 or sections discarded by a linker script, we just want the
3121 section contents zeroed. Avoid any special processing. */
3122 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
3123 rel->r_info = 0;
3124 rel->r_addend = 0;
3125 continue;
3126 }
3127
3128 if (info->relocatable)
3129 continue;
3130
3131 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3132 it here if it is defined in a non-shared object. */
3133 if (h != NULL
3134 && h->type == STT_GNU_IFUNC
3135 && h->def_regular)
3136 {
3137 asection *plt, *gotplt, *base_got;
3138 bfd_vma plt_index;
3139
3140 if ((input_section->flags & SEC_ALLOC) == 0
3141 || h->plt.offset == (bfd_vma) -1)
3142 abort ();
3143
3144 /* STT_GNU_IFUNC symbol must go through PLT. */
3145 if (htab->splt != NULL)
3146 {
3147 plt = htab->splt;
3148 gotplt = htab->sgotplt;
3149 }
3150 else
3151 {
3152 plt = htab->iplt;
3153 gotplt = htab->igotplt;
3154 }
3155
3156 relocation = (plt->output_section->vma
3157 + plt->output_offset + h->plt.offset);
3158
3159 switch (r_type)
3160 {
3161 default:
3162 (*_bfd_error_handler)
3163 (_("%B: relocation %s against STT_GNU_IFUNC "
3164 "symbol `%s' isn't handled by %s"), input_bfd,
3165 elf_howto_table[r_type].name,
3166 (h->root.root.string
3167 ? h->root.root.string : "a local symbol"),
3168 __FUNCTION__);
3169 bfd_set_error (bfd_error_bad_value);
3170 return FALSE;
3171
3172 case R_386_32:
3173 /* Generate dynamic relcoation only when there is a
3174 non-GOF reference in a shared object. */
3175 if (info->shared && h->non_got_ref)
3176 {
3177 Elf_Internal_Rela outrel;
3178 bfd_byte *loc;
3179 asection *sreloc;
3180 bfd_vma offset;
3181
3182 /* Need a dynamic relocation to get the real function
3183 adddress. */
3184 offset = _bfd_elf_section_offset (output_bfd,
3185 info,
3186 input_section,
3187 rel->r_offset);
3188 if (offset == (bfd_vma) -1
3189 || offset == (bfd_vma) -2)
3190 abort ();
3191
3192 outrel.r_offset = (input_section->output_section->vma
3193 + input_section->output_offset
3194 + offset);
3195
3196 if (h->dynindx == -1
3197 || h->forced_local)
3198 {
3199 /* This symbol is resolved locally. */
3200 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3201 bfd_put_32 (output_bfd,
3202 (h->root.u.def.value
3203 + h->root.u.def.section->output_section->vma
3204 + h->root.u.def.section->output_offset),
3205 contents + offset);
3206 }
3207 else
3208 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3209
3210 sreloc = htab->irelifunc;
3211 loc = sreloc->contents;
3212 loc += (sreloc->reloc_count++
3213 * sizeof (Elf32_External_Rel));
3214 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3215
3216 /* If this reloc is against an external symbol, we
3217 do not want to fiddle with the addend. Otherwise,
3218 we need to include the symbol value so that it
3219 becomes an addend for the dynamic reloc. For an
3220 internal symbol, we have updated addend. */
3221 continue;
3222 }
3223
3224 case R_386_PC32:
3225 case R_386_PLT32:
3226 goto do_relocation;
3227
3228 case R_386_GOT32:
3229 base_got = htab->sgot;
3230 off = h->got.offset;
3231
3232 if (base_got == NULL)
3233 abort ();
3234
3235 if (off == (bfd_vma) -1)
3236 {
3237 /* We can't use h->got.offset here to save state, or
3238 even just remember the offset, as finish_dynamic_symbol
3239 would use that as offset into .got. */
3240
3241 if (htab->splt != NULL)
3242 {
3243 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3244 off = (plt_index + 3) * 4;
3245 base_got = htab->sgotplt;
3246 }
3247 else
3248 {
3249 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3250 off = plt_index * 4;
3251 base_got = htab->igotplt;
3252 }
3253
3254 if (h->dynindx == -1
3255 || h->forced_local
3256 || info->symbolic)
3257 {
3258 /* This references the local defitionion. We must
3259 initialize this entry in the global offset table.
3260 Since the offset must always be a multiple of 8,
3261 we use the least significant bit to record
3262 whether we have initialized it already.
3263
3264 When doing a dynamic link, we create a .rela.got
3265 relocation entry to initialize the value. This
3266 is done in the finish_dynamic_symbol routine. */
3267 if ((off & 1) != 0)
3268 off &= ~1;
3269 else
3270 {
3271 bfd_put_32 (output_bfd, relocation,
3272 base_got->contents + off);
3273 h->got.offset |= 1;
3274 }
3275 }
3276
3277 relocation = off;
3278
3279 /* Adjust for static executables. */
3280 if (htab->splt == NULL)
3281 relocation += gotplt->output_offset;
3282 }
3283 else
3284 {
3285 relocation = (base_got->output_section->vma
3286 + base_got->output_offset + off
3287 - gotplt->output_section->vma
3288 - gotplt->output_offset);
3289 /* Adjust for static executables. */
3290 if (htab->splt == NULL)
3291 relocation += gotplt->output_offset;
3292 }
3293
3294 goto do_relocation;
3295
3296 case R_386_GOTOFF:
3297 relocation -= (gotplt->output_section->vma
3298 + gotplt->output_offset);
3299 goto do_relocation;
3300 }
3301 }
3302
3303 switch (r_type)
3304 {
3305 case R_386_GOT32:
3306 /* Relocation is to the entry for this symbol in the global
3307 offset table. */
3308 if (htab->sgot == NULL)
3309 abort ();
3310
3311 if (h != NULL)
3312 {
3313 bfd_boolean dyn;
3314
3315 off = h->got.offset;
3316 dyn = htab->elf.dynamic_sections_created;
3317 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3318 || (info->shared
3319 && SYMBOL_REFERENCES_LOCAL (info, h))
3320 || (ELF_ST_VISIBILITY (h->other)
3321 && h->root.type == bfd_link_hash_undefweak))
3322 {
3323 /* This is actually a static link, or it is a
3324 -Bsymbolic link and the symbol is defined
3325 locally, or the symbol was forced to be local
3326 because of a version file. We must initialize
3327 this entry in the global offset table. Since the
3328 offset must always be a multiple of 4, we use the
3329 least significant bit to record whether we have
3330 initialized it already.
3331
3332 When doing a dynamic link, we create a .rel.got
3333 relocation entry to initialize the value. This
3334 is done in the finish_dynamic_symbol routine. */
3335 if ((off & 1) != 0)
3336 off &= ~1;
3337 else
3338 {
3339 bfd_put_32 (output_bfd, relocation,
3340 htab->sgot->contents + off);
3341 h->got.offset |= 1;
3342 }
3343 }
3344 else
3345 unresolved_reloc = FALSE;
3346 }
3347 else
3348 {
3349 if (local_got_offsets == NULL)
3350 abort ();
3351
3352 off = local_got_offsets[r_symndx];
3353
3354 /* The offset must always be a multiple of 4. We use
3355 the least significant bit to record whether we have
3356 already generated the necessary reloc. */
3357 if ((off & 1) != 0)
3358 off &= ~1;
3359 else
3360 {
3361 bfd_put_32 (output_bfd, relocation,
3362 htab->sgot->contents + off);
3363
3364 if (info->shared)
3365 {
3366 asection *s;
3367 Elf_Internal_Rela outrel;
3368 bfd_byte *loc;
3369
3370 s = htab->srelgot;
3371 if (s == NULL)
3372 abort ();
3373
3374 outrel.r_offset = (htab->sgot->output_section->vma
3375 + htab->sgot->output_offset
3376 + off);
3377 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3378 loc = s->contents;
3379 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3380 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3381 }
3382
3383 local_got_offsets[r_symndx] |= 1;
3384 }
3385 }
3386
3387 if (off >= (bfd_vma) -2)
3388 abort ();
3389
3390 relocation = htab->sgot->output_section->vma
3391 + htab->sgot->output_offset + off
3392 - htab->sgotplt->output_section->vma
3393 - htab->sgotplt->output_offset;
3394 break;
3395
3396 case R_386_GOTOFF:
3397 /* Relocation is relative to the start of the global offset
3398 table. */
3399
3400 /* Check to make sure it isn't a protected function symbol
3401 for shared library since it may not be local when used
3402 as function address. We also need to make sure that a
3403 symbol is defined locally. */
3404 if (info->shared && h)
3405 {
3406 if (!h->def_regular)
3407 {
3408 const char *v;
3409
3410 switch (ELF_ST_VISIBILITY (h->other))
3411 {
3412 case STV_HIDDEN:
3413 v = _("hidden symbol");
3414 break;
3415 case STV_INTERNAL:
3416 v = _("internal symbol");
3417 break;
3418 case STV_PROTECTED:
3419 v = _("protected symbol");
3420 break;
3421 default:
3422 v = _("symbol");
3423 break;
3424 }
3425
3426 (*_bfd_error_handler)
3427 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3428 input_bfd, v, h->root.root.string);
3429 bfd_set_error (bfd_error_bad_value);
3430 return FALSE;
3431 }
3432 else if (!info->executable
3433 && h->type == STT_FUNC
3434 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3435 {
3436 (*_bfd_error_handler)
3437 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3438 input_bfd, h->root.root.string);
3439 bfd_set_error (bfd_error_bad_value);
3440 return FALSE;
3441 }
3442 }
3443
3444 /* Note that sgot is not involved in this
3445 calculation. We always want the start of .got.plt. If we
3446 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3447 permitted by the ABI, we might have to change this
3448 calculation. */
3449 relocation -= htab->sgotplt->output_section->vma
3450 + htab->sgotplt->output_offset;
3451 break;
3452
3453 case R_386_GOTPC:
3454 /* Use global offset table as symbol value. */
3455 relocation = htab->sgotplt->output_section->vma
3456 + htab->sgotplt->output_offset;
3457 unresolved_reloc = FALSE;
3458 break;
3459
3460 case R_386_PLT32:
3461 /* Relocation is to the entry for this symbol in the
3462 procedure linkage table. */
3463
3464 /* Resolve a PLT32 reloc against a local symbol directly,
3465 without using the procedure linkage table. */
3466 if (h == NULL)
3467 break;
3468
3469 if (h->plt.offset == (bfd_vma) -1
3470 || htab->splt == NULL)
3471 {
3472 /* We didn't make a PLT entry for this symbol. This
3473 happens when statically linking PIC code, or when
3474 using -Bsymbolic. */
3475 break;
3476 }
3477
3478 relocation = (htab->splt->output_section->vma
3479 + htab->splt->output_offset
3480 + h->plt.offset);
3481 unresolved_reloc = FALSE;
3482 break;
3483
3484 case R_386_32:
3485 case R_386_PC32:
3486 if ((input_section->flags & SEC_ALLOC) == 0
3487 || is_vxworks_tls)
3488 break;
3489
3490 if ((info->shared
3491 && (h == NULL
3492 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3493 || h->root.type != bfd_link_hash_undefweak)
3494 && (r_type != R_386_PC32
3495 || !SYMBOL_CALLS_LOCAL (info, h)))
3496 || (ELIMINATE_COPY_RELOCS
3497 && !info->shared
3498 && h != NULL
3499 && h->dynindx != -1
3500 && !h->non_got_ref
3501 && ((h->def_dynamic
3502 && !h->def_regular)
3503 || h->root.type == bfd_link_hash_undefweak
3504 || h->root.type == bfd_link_hash_undefined)))
3505 {
3506 Elf_Internal_Rela outrel;
3507 bfd_byte *loc;
3508 bfd_boolean skip, relocate;
3509 asection *sreloc;
3510
3511 /* When generating a shared object, these relocations
3512 are copied into the output file to be resolved at run
3513 time. */
3514
3515 skip = FALSE;
3516 relocate = FALSE;
3517
3518 outrel.r_offset =
3519 _bfd_elf_section_offset (output_bfd, info, input_section,
3520 rel->r_offset);
3521 if (outrel.r_offset == (bfd_vma) -1)
3522 skip = TRUE;
3523 else if (outrel.r_offset == (bfd_vma) -2)
3524 skip = TRUE, relocate = TRUE;
3525 outrel.r_offset += (input_section->output_section->vma
3526 + input_section->output_offset);
3527
3528 if (skip)
3529 memset (&outrel, 0, sizeof outrel);
3530 else if (h != NULL
3531 && h->dynindx != -1
3532 && (r_type == R_386_PC32
3533 || !info->shared
3534 || !SYMBOLIC_BIND (info, h)
3535 || !h->def_regular))
3536 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3537 else
3538 {
3539 /* This symbol is local, or marked to become local. */
3540 relocate = TRUE;
3541 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3542 }
3543
3544 sreloc = elf_section_data (input_section)->sreloc;
3545
3546 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3547
3548 loc = sreloc->contents;
3549 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3550
3551 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3552
3553 /* If this reloc is against an external symbol, we do
3554 not want to fiddle with the addend. Otherwise, we
3555 need to include the symbol value so that it becomes
3556 an addend for the dynamic reloc. */
3557 if (! relocate)
3558 continue;
3559 }
3560 break;
3561
3562 case R_386_TLS_IE:
3563 if (info->shared)
3564 {
3565 Elf_Internal_Rela outrel;
3566 bfd_byte *loc;
3567 asection *sreloc;
3568
3569 outrel.r_offset = rel->r_offset
3570 + input_section->output_section->vma
3571 + input_section->output_offset;
3572 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3573 sreloc = elf_section_data (input_section)->sreloc;
3574 if (sreloc == NULL)
3575 abort ();
3576 loc = sreloc->contents;
3577 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3578 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3579 }
3580 /* Fall through */
3581
3582 case R_386_TLS_GD:
3583 case R_386_TLS_GOTDESC:
3584 case R_386_TLS_DESC_CALL:
3585 case R_386_TLS_IE_32:
3586 case R_386_TLS_GOTIE:
3587 tls_type = GOT_UNKNOWN;
3588 if (h == NULL && local_got_offsets)
3589 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3590 else if (h != NULL)
3591 tls_type = elf_i386_hash_entry(h)->tls_type;
3592 if (tls_type == GOT_TLS_IE)
3593 tls_type = GOT_TLS_IE_NEG;
3594
3595 if (! elf_i386_tls_transition (info, input_bfd,
3596 input_section, contents,
3597 symtab_hdr, sym_hashes,
3598 &r_type, tls_type, rel,
3599 relend, h))
3600 return FALSE;
3601
3602 if (r_type == R_386_TLS_LE_32)
3603 {
3604 BFD_ASSERT (! unresolved_reloc);
3605 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3606 {
3607 unsigned int type;
3608 bfd_vma roff;
3609
3610 /* GD->LE transition. */
3611 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3612 if (type == 0x04)
3613 {
3614 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3615 Change it into:
3616 movl %gs:0, %eax; subl $foo@tpoff, %eax
3617 (6 byte form of subl). */
3618 memcpy (contents + rel->r_offset - 3,
3619 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3620 roff = rel->r_offset + 5;
3621 }
3622 else
3623 {
3624 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3625 Change it into:
3626 movl %gs:0, %eax; subl $foo@tpoff, %eax
3627 (6 byte form of subl). */
3628 memcpy (contents + rel->r_offset - 2,
3629 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3630 roff = rel->r_offset + 6;
3631 }
3632 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3633 contents + roff);
3634 /* Skip R_386_PC32/R_386_PLT32. */
3635 rel++;
3636 continue;
3637 }
3638 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3639 {
3640 /* GDesc -> LE transition.
3641 It's originally something like:
3642 leal x@tlsdesc(%ebx), %eax
3643
3644 leal x@ntpoff, %eax
3645
3646 Registers other than %eax may be set up here. */
3647
3648 unsigned int val;
3649 bfd_vma roff;
3650
3651 roff = rel->r_offset;
3652 val = bfd_get_8 (input_bfd, contents + roff - 1);
3653
3654 /* Now modify the instruction as appropriate. */
3655 /* aoliva FIXME: remove the above and xor the byte
3656 below with 0x86. */
3657 bfd_put_8 (output_bfd, val ^ 0x86,
3658 contents + roff - 1);
3659 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3660 contents + roff);
3661 continue;
3662 }
3663 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3664 {
3665 /* GDesc -> LE transition.
3666 It's originally:
3667 call *(%eax)
3668 Turn it into:
3669 xchg %ax,%ax */
3670
3671 bfd_vma roff;
3672
3673 roff = rel->r_offset;
3674 bfd_put_8 (output_bfd, 0x66, contents + roff);
3675 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3676 continue;
3677 }
3678 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3679 {
3680 unsigned int val;
3681
3682 /* IE->LE transition:
3683 Originally it can be one of:
3684 movl foo, %eax
3685 movl foo, %reg
3686 addl foo, %reg
3687 We change it into:
3688 movl $foo, %eax
3689 movl $foo, %reg
3690 addl $foo, %reg. */
3691 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3692 if (val == 0xa1)
3693 {
3694 /* movl foo, %eax. */
3695 bfd_put_8 (output_bfd, 0xb8,
3696 contents + rel->r_offset - 1);
3697 }
3698 else
3699 {
3700 unsigned int type;
3701
3702 type = bfd_get_8 (input_bfd,
3703 contents + rel->r_offset - 2);
3704 switch (type)
3705 {
3706 case 0x8b:
3707 /* movl */
3708 bfd_put_8 (output_bfd, 0xc7,
3709 contents + rel->r_offset - 2);
3710 bfd_put_8 (output_bfd,
3711 0xc0 | ((val >> 3) & 7),
3712 contents + rel->r_offset - 1);
3713 break;
3714 case 0x03:
3715 /* addl */
3716 bfd_put_8 (output_bfd, 0x81,
3717 contents + rel->r_offset - 2);
3718 bfd_put_8 (output_bfd,
3719 0xc0 | ((val >> 3) & 7),
3720 contents + rel->r_offset - 1);
3721 break;
3722 default:
3723 BFD_FAIL ();
3724 break;
3725 }
3726 }
3727 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3728 contents + rel->r_offset);
3729 continue;
3730 }
3731 else
3732 {
3733 unsigned int val, type;
3734
3735 /* {IE_32,GOTIE}->LE transition:
3736 Originally it can be one of:
3737 subl foo(%reg1), %reg2
3738 movl foo(%reg1), %reg2
3739 addl foo(%reg1), %reg2
3740 We change it into:
3741 subl $foo, %reg2
3742 movl $foo, %reg2 (6 byte form)
3743 addl $foo, %reg2. */
3744 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3745 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3746 if (type == 0x8b)
3747 {
3748 /* movl */
3749 bfd_put_8 (output_bfd, 0xc7,
3750 contents + rel->r_offset - 2);
3751 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3752 contents + rel->r_offset - 1);
3753 }
3754 else if (type == 0x2b)
3755 {
3756 /* subl */
3757 bfd_put_8 (output_bfd, 0x81,
3758 contents + rel->r_offset - 2);
3759 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3760 contents + rel->r_offset - 1);
3761 }
3762 else if (type == 0x03)
3763 {
3764 /* addl */
3765 bfd_put_8 (output_bfd, 0x81,
3766 contents + rel->r_offset - 2);
3767 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3768 contents + rel->r_offset - 1);
3769 }
3770 else
3771 BFD_FAIL ();
3772 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3773 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3774 contents + rel->r_offset);
3775 else
3776 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3777 contents + rel->r_offset);
3778 continue;
3779 }
3780 }
3781
3782 if (htab->sgot == NULL)
3783 abort ();
3784
3785 if (h != NULL)
3786 {
3787 off = h->got.offset;
3788 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3789 }
3790 else
3791 {
3792 if (local_got_offsets == NULL)
3793 abort ();
3794
3795 off = local_got_offsets[r_symndx];
3796 offplt = local_tlsdesc_gotents[r_symndx];
3797 }
3798
3799 if ((off & 1) != 0)
3800 off &= ~1;
3801 else
3802 {
3803 Elf_Internal_Rela outrel;
3804 bfd_byte *loc;
3805 int dr_type, indx;
3806 asection *sreloc;
3807
3808 if (htab->srelgot == NULL)
3809 abort ();
3810
3811 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3812
3813 if (GOT_TLS_GDESC_P (tls_type))
3814 {
3815 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3816 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3817 <= htab->sgotplt->size);
3818 outrel.r_offset = (htab->sgotplt->output_section->vma
3819 + htab->sgotplt->output_offset
3820 + offplt
3821 + htab->sgotplt_jump_table_size);
3822 sreloc = htab->srelplt;
3823 loc = sreloc->contents;
3824 loc += (htab->next_tls_desc_index++
3825 * sizeof (Elf32_External_Rel));
3826 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3827 <= sreloc->contents + sreloc->size);
3828 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3829 if (indx == 0)
3830 {
3831 BFD_ASSERT (! unresolved_reloc);
3832 bfd_put_32 (output_bfd,
3833 relocation - elf_i386_dtpoff_base (info),
3834 htab->sgotplt->contents + offplt
3835 + htab->sgotplt_jump_table_size + 4);
3836 }
3837 else
3838 {
3839 bfd_put_32 (output_bfd, 0,
3840 htab->sgotplt->contents + offplt
3841 + htab->sgotplt_jump_table_size + 4);
3842 }
3843 }
3844
3845 sreloc = htab->srelgot;
3846
3847 outrel.r_offset = (htab->sgot->output_section->vma
3848 + htab->sgot->output_offset + off);
3849
3850 if (GOT_TLS_GD_P (tls_type))
3851 dr_type = R_386_TLS_DTPMOD32;
3852 else if (GOT_TLS_GDESC_P (tls_type))
3853 goto dr_done;
3854 else if (tls_type == GOT_TLS_IE_POS)
3855 dr_type = R_386_TLS_TPOFF;
3856 else
3857 dr_type = R_386_TLS_TPOFF32;
3858
3859 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3860 bfd_put_32 (output_bfd,
3861 relocation - elf_i386_dtpoff_base (info),
3862 htab->sgot->contents + off);
3863 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3864 bfd_put_32 (output_bfd,
3865 elf_i386_dtpoff_base (info) - relocation,
3866 htab->sgot->contents + off);
3867 else if (dr_type != R_386_TLS_DESC)
3868 bfd_put_32 (output_bfd, 0,
3869 htab->sgot->contents + off);
3870 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3871
3872 loc = sreloc->contents;
3873 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3874 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3875 <= sreloc->contents + sreloc->size);
3876 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3877
3878 if (GOT_TLS_GD_P (tls_type))
3879 {
3880 if (indx == 0)
3881 {
3882 BFD_ASSERT (! unresolved_reloc);
3883 bfd_put_32 (output_bfd,
3884 relocation - elf_i386_dtpoff_base (info),
3885 htab->sgot->contents + off + 4);
3886 }
3887 else
3888 {
3889 bfd_put_32 (output_bfd, 0,
3890 htab->sgot->contents + off + 4);
3891 outrel.r_info = ELF32_R_INFO (indx,
3892 R_386_TLS_DTPOFF32);
3893 outrel.r_offset += 4;
3894 sreloc->reloc_count++;
3895 loc += sizeof (Elf32_External_Rel);
3896 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3897 <= sreloc->contents + sreloc->size);
3898 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3899 }
3900 }
3901 else if (tls_type == GOT_TLS_IE_BOTH)
3902 {
3903 bfd_put_32 (output_bfd,
3904 (indx == 0
3905 ? relocation - elf_i386_dtpoff_base (info)
3906 : 0),
3907 htab->sgot->contents + off + 4);
3908 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3909 outrel.r_offset += 4;
3910 sreloc->reloc_count++;
3911 loc += sizeof (Elf32_External_Rel);
3912 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3913 }
3914
3915 dr_done:
3916 if (h != NULL)
3917 h->got.offset |= 1;
3918 else
3919 local_got_offsets[r_symndx] |= 1;
3920 }
3921
3922 if (off >= (bfd_vma) -2
3923 && ! GOT_TLS_GDESC_P (tls_type))
3924 abort ();
3925 if (r_type == R_386_TLS_GOTDESC
3926 || r_type == R_386_TLS_DESC_CALL)
3927 {
3928 relocation = htab->sgotplt_jump_table_size + offplt;
3929 unresolved_reloc = FALSE;
3930 }
3931 else if (r_type == ELF32_R_TYPE (rel->r_info))
3932 {
3933 bfd_vma g_o_t = htab->sgotplt->output_section->vma
3934 + htab->sgotplt->output_offset;
3935 relocation = htab->sgot->output_section->vma
3936 + htab->sgot->output_offset + off - g_o_t;
3937 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3938 && tls_type == GOT_TLS_IE_BOTH)
3939 relocation += 4;
3940 if (r_type == R_386_TLS_IE)
3941 relocation += g_o_t;
3942 unresolved_reloc = FALSE;
3943 }
3944 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3945 {
3946 unsigned int val, type;
3947 bfd_vma roff;
3948
3949 /* GD->IE transition. */
3950 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3951 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3952 if (type == 0x04)
3953 {
3954 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3955 Change it into:
3956 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3957 val >>= 3;
3958 roff = rel->r_offset - 3;
3959 }
3960 else
3961 {
3962 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3963 Change it into:
3964 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3965 roff = rel->r_offset - 2;
3966 }
3967 memcpy (contents + roff,
3968 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3969 contents[roff + 7] = 0x80 | (val & 7);
3970 /* If foo is used only with foo@gotntpoff(%reg) and
3971 foo@indntpoff, but not with foo@gottpoff(%reg), change
3972 subl $foo@gottpoff(%reg), %eax
3973 into:
3974 addl $foo@gotntpoff(%reg), %eax. */
3975 if (tls_type == GOT_TLS_IE_POS)
3976 contents[roff + 6] = 0x03;
3977 bfd_put_32 (output_bfd,
3978 htab->sgot->output_section->vma
3979 + htab->sgot->output_offset + off
3980 - htab->sgotplt->output_section->vma
3981 - htab->sgotplt->output_offset,
3982 contents + roff + 8);
3983 /* Skip R_386_PLT32. */
3984 rel++;
3985 continue;
3986 }
3987 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3988 {
3989 /* GDesc -> IE transition.
3990 It's originally something like:
3991 leal x@tlsdesc(%ebx), %eax
3992
3993 Change it to:
3994 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3995 or:
3996 movl x@gottpoff(%ebx), %eax # before negl %eax
3997
3998 Registers other than %eax may be set up here. */
3999
4000 bfd_vma roff;
4001
4002 /* First, make sure it's a leal adding ebx to a 32-bit
4003 offset into any register, although it's probably
4004 almost always going to be eax. */
4005 roff = rel->r_offset;
4006
4007 /* Now modify the instruction as appropriate. */
4008 /* To turn a leal into a movl in the form we use it, it
4009 suffices to change the first byte from 0x8d to 0x8b.
4010 aoliva FIXME: should we decide to keep the leal, all
4011 we have to do is remove the statement below, and
4012 adjust the relaxation of R_386_TLS_DESC_CALL. */
4013 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4014
4015 if (tls_type == GOT_TLS_IE_BOTH)
4016 off += 4;
4017
4018 bfd_put_32 (output_bfd,
4019 htab->sgot->output_section->vma
4020 + htab->sgot->output_offset + off
4021 - htab->sgotplt->output_section->vma
4022 - htab->sgotplt->output_offset,
4023 contents + roff);
4024 continue;
4025 }
4026 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4027 {
4028 /* GDesc -> IE transition.
4029 It's originally:
4030 call *(%eax)
4031
4032 Change it to:
4033 xchg %ax,%ax
4034 or
4035 negl %eax
4036 depending on how we transformed the TLS_GOTDESC above.
4037 */
4038
4039 bfd_vma roff;
4040
4041 roff = rel->r_offset;
4042
4043 /* Now modify the instruction as appropriate. */
4044 if (tls_type != GOT_TLS_IE_NEG)
4045 {
4046 /* xchg %ax,%ax */
4047 bfd_put_8 (output_bfd, 0x66, contents + roff);
4048 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4049 }
4050 else
4051 {
4052 /* negl %eax */
4053 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4054 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4055 }
4056
4057 continue;
4058 }
4059 else
4060 BFD_ASSERT (FALSE);
4061 break;
4062
4063 case R_386_TLS_LDM:
4064 if (! elf_i386_tls_transition (info, input_bfd,
4065 input_section, contents,
4066 symtab_hdr, sym_hashes,
4067 &r_type, GOT_UNKNOWN, rel,
4068 relend, h))
4069 return FALSE;
4070
4071 if (r_type != R_386_TLS_LDM)
4072 {
4073 /* LD->LE transition:
4074 leal foo(%reg), %eax; call ___tls_get_addr.
4075 We change it into:
4076 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4077 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4078 memcpy (contents + rel->r_offset - 2,
4079 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4080 /* Skip R_386_PC32/R_386_PLT32. */
4081 rel++;
4082 continue;
4083 }
4084
4085 if (htab->sgot == NULL)
4086 abort ();
4087
4088 off = htab->tls_ldm_got.offset;
4089 if (off & 1)
4090 off &= ~1;
4091 else
4092 {
4093 Elf_Internal_Rela outrel;
4094 bfd_byte *loc;
4095
4096 if (htab->srelgot == NULL)
4097 abort ();
4098
4099 outrel.r_offset = (htab->sgot->output_section->vma
4100 + htab->sgot->output_offset + off);
4101
4102 bfd_put_32 (output_bfd, 0,
4103 htab->sgot->contents + off);
4104 bfd_put_32 (output_bfd, 0,
4105 htab->sgot->contents + off + 4);
4106 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4107 loc = htab->srelgot->contents;
4108 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4109 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4110 htab->tls_ldm_got.offset |= 1;
4111 }
4112 relocation = htab->sgot->output_section->vma
4113 + htab->sgot->output_offset + off
4114 - htab->sgotplt->output_section->vma
4115 - htab->sgotplt->output_offset;
4116 unresolved_reloc = FALSE;
4117 break;
4118
4119 case R_386_TLS_LDO_32:
4120 if (info->shared || (input_section->flags & SEC_CODE) == 0)
4121 relocation -= elf_i386_dtpoff_base (info);
4122 else
4123 /* When converting LDO to LE, we must negate. */
4124 relocation = -elf_i386_tpoff (info, relocation);
4125 break;
4126
4127 case R_386_TLS_LE_32:
4128 case R_386_TLS_LE:
4129 if (info->shared)
4130 {
4131 Elf_Internal_Rela outrel;
4132 asection *sreloc;
4133 bfd_byte *loc;
4134 int indx;
4135
4136 outrel.r_offset = rel->r_offset
4137 + input_section->output_section->vma
4138 + input_section->output_offset;
4139 if (h != NULL && h->dynindx != -1)
4140 indx = h->dynindx;
4141 else
4142 indx = 0;
4143 if (r_type == R_386_TLS_LE_32)
4144 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4145 else
4146 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4147 sreloc = elf_section_data (input_section)->sreloc;
4148 if (sreloc == NULL)
4149 abort ();
4150 loc = sreloc->contents;
4151 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4152 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4153 if (indx)
4154 continue;
4155 else if (r_type == R_386_TLS_LE_32)
4156 relocation = elf_i386_dtpoff_base (info) - relocation;
4157 else
4158 relocation -= elf_i386_dtpoff_base (info);
4159 }
4160 else if (r_type == R_386_TLS_LE_32)
4161 relocation = elf_i386_tpoff (info, relocation);
4162 else
4163 relocation = -elf_i386_tpoff (info, relocation);
4164 break;
4165
4166 default:
4167 break;
4168 }
4169
4170 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4171 because such sections are not SEC_ALLOC and thus ld.so will
4172 not process them. */
4173 if (unresolved_reloc
4174 && !((input_section->flags & SEC_DEBUGGING) != 0
4175 && h->def_dynamic))
4176 {
4177 (*_bfd_error_handler)
4178 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4179 input_bfd,
4180 input_section,
4181 (long) rel->r_offset,
4182 howto->name,
4183 h->root.root.string);
4184 return FALSE;
4185 }
4186
4187 do_relocation:
4188 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4189 contents, rel->r_offset,
4190 relocation, 0);
4191
4192 if (r != bfd_reloc_ok)
4193 {
4194 const char *name;
4195
4196 if (h != NULL)
4197 name = h->root.root.string;
4198 else
4199 {
4200 name = bfd_elf_string_from_elf_section (input_bfd,
4201 symtab_hdr->sh_link,
4202 sym->st_name);
4203 if (name == NULL)
4204 return FALSE;
4205 if (*name == '\0')
4206 name = bfd_section_name (input_bfd, sec);
4207 }
4208
4209 if (r == bfd_reloc_overflow)
4210 {
4211 if (! ((*info->callbacks->reloc_overflow)
4212 (info, (h ? &h->root : NULL), name, howto->name,
4213 (bfd_vma) 0, input_bfd, input_section,
4214 rel->r_offset)))
4215 return FALSE;
4216 }
4217 else
4218 {
4219 (*_bfd_error_handler)
4220 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4221 input_bfd, input_section,
4222 (long) rel->r_offset, name, (int) r);
4223 return FALSE;
4224 }
4225 }
4226 }
4227
4228 return TRUE;
4229 }
4230
4231 /* Finish up dynamic symbol handling. We set the contents of various
4232 dynamic sections here. */
4233
4234 static bfd_boolean
4235 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4236 struct bfd_link_info *info,
4237 struct elf_link_hash_entry *h,
4238 Elf_Internal_Sym *sym)
4239 {
4240 struct elf_i386_link_hash_table *htab;
4241
4242 htab = elf_i386_hash_table (info);
4243
4244 if (h->plt.offset != (bfd_vma) -1)
4245 {
4246 bfd_vma plt_index;
4247 bfd_vma got_offset;
4248 Elf_Internal_Rela rel;
4249 bfd_byte *loc;
4250 asection *plt, *gotplt, *relplt;
4251
4252 /* When building a static executable, use .iplt, .igot.plt and
4253 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4254 if (htab->splt != NULL)
4255 {
4256 plt = htab->splt;
4257 gotplt = htab->sgotplt;
4258 relplt = htab->srelplt;
4259 }
4260 else
4261 {
4262 plt = htab->iplt;
4263 gotplt = htab->igotplt;
4264 relplt = htab->irelplt;
4265 }
4266
4267 /* This symbol has an entry in the procedure linkage table. Set
4268 it up. */
4269
4270 if ((h->dynindx == -1
4271 && !((h->forced_local || info->executable)
4272 && h->def_regular
4273 && h->type == STT_GNU_IFUNC))
4274 || plt == NULL
4275 || gotplt == NULL
4276 || relplt == NULL)
4277 abort ();
4278
4279 /* Get the index in the procedure linkage table which
4280 corresponds to this symbol. This is the index of this symbol
4281 in all the symbols for which we are making plt entries. The
4282 first entry in the procedure linkage table is reserved.
4283
4284 Get the offset into the .got table of the entry that
4285 corresponds to this function. Each .got entry is 4 bytes.
4286 The first three are reserved.
4287
4288 For static executables, we don't reserve anything. */
4289
4290 if (plt == htab->splt)
4291 {
4292 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
4293 got_offset = (plt_index + 3) * 4;
4294 }
4295 else
4296 {
4297 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
4298 got_offset = plt_index * 4;
4299 }
4300
4301 /* Fill in the entry in the procedure linkage table. */
4302 if (! info->shared)
4303 {
4304 memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry,
4305 PLT_ENTRY_SIZE);
4306 bfd_put_32 (output_bfd,
4307 (gotplt->output_section->vma
4308 + gotplt->output_offset
4309 + got_offset),
4310 plt->contents + h->plt.offset + 2);
4311
4312 if (htab->is_vxworks)
4313 {
4314 int s, k, reloc_index;
4315
4316 /* Create the R_386_32 relocation referencing the GOT
4317 for this PLT entry. */
4318
4319 /* S: Current slot number (zero-based). */
4320 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
4321 /* K: Number of relocations for PLTResolve. */
4322 if (info->shared)
4323 k = PLTRESOLVE_RELOCS_SHLIB;
4324 else
4325 k = PLTRESOLVE_RELOCS;
4326 /* Skip the PLTresolve relocations, and the relocations for
4327 the other PLT slots. */
4328 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4329 loc = (htab->srelplt2->contents + reloc_index
4330 * sizeof (Elf32_External_Rel));
4331
4332 rel.r_offset = (htab->splt->output_section->vma
4333 + htab->splt->output_offset
4334 + h->plt.offset + 2),
4335 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4336 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4337
4338 /* Create the R_386_32 relocation referencing the beginning of
4339 the PLT for this GOT entry. */
4340 rel.r_offset = (htab->sgotplt->output_section->vma
4341 + htab->sgotplt->output_offset
4342 + got_offset);
4343 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4344 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4345 loc + sizeof (Elf32_External_Rel));
4346 }
4347 }
4348 else
4349 {
4350 memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry,
4351 PLT_ENTRY_SIZE);
4352 bfd_put_32 (output_bfd, got_offset,
4353 plt->contents + h->plt.offset + 2);
4354 }
4355
4356 /* Don't fill PLT entry for static executables. */
4357 if (plt == htab->splt)
4358 {
4359 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4360 plt->contents + h->plt.offset + 7);
4361 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
4362 plt->contents + h->plt.offset + 12);
4363 }
4364
4365 /* Fill in the entry in the global offset table. */
4366 bfd_put_32 (output_bfd,
4367 (plt->output_section->vma
4368 + plt->output_offset
4369 + h->plt.offset
4370 + 6),
4371 gotplt->contents + got_offset);
4372
4373 /* Fill in the entry in the .rel.plt section. */
4374 rel.r_offset = (gotplt->output_section->vma
4375 + gotplt->output_offset
4376 + got_offset);
4377 if (h->dynindx == -1
4378 || ((info->executable
4379 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4380 && h->def_regular
4381 && h->type == STT_GNU_IFUNC))
4382 {
4383 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4384 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4385 in the .got.plt section. */
4386 bfd_put_32 (output_bfd,
4387 (h->root.u.def.value
4388 + h->root.u.def.section->output_section->vma
4389 + h->root.u.def.section->output_offset),
4390 gotplt->contents + got_offset);
4391 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4392 }
4393 else
4394 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4395 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4396 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4397
4398 if (!h->def_regular)
4399 {
4400 /* Mark the symbol as undefined, rather than as defined in
4401 the .plt section. Leave the value if there were any
4402 relocations where pointer equality matters (this is a clue
4403 for the dynamic linker, to make function pointer
4404 comparisons work between an application and shared
4405 library), otherwise set it to zero. If a function is only
4406 called from a binary, there is no need to slow down
4407 shared libraries because of that. */
4408 sym->st_shndx = SHN_UNDEF;
4409 if (!h->pointer_equality_needed)
4410 sym->st_value = 0;
4411 }
4412 }
4413
4414 if (h->got.offset != (bfd_vma) -1
4415 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4416 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4417 {
4418 Elf_Internal_Rela rel;
4419 bfd_byte *loc;
4420
4421 /* This symbol has an entry in the global offset table. Set it
4422 up. */
4423
4424 if (htab->sgot == NULL || htab->srelgot == NULL)
4425 abort ();
4426
4427 rel.r_offset = (htab->sgot->output_section->vma
4428 + htab->sgot->output_offset
4429 + (h->got.offset & ~(bfd_vma) 1));
4430
4431 /* If this is a static link, or it is a -Bsymbolic link and the
4432 symbol is defined locally or was forced to be local because
4433 of a version file, we just want to emit a RELATIVE reloc.
4434 The entry in the global offset table will already have been
4435 initialized in the relocate_section function. */
4436 if (h->def_regular
4437 && h->type == STT_GNU_IFUNC)
4438 {
4439 if (info->shared)
4440 {
4441 /* Generate R_386_GLOB_DAT. */
4442 goto do_glob_dat;
4443 }
4444 else
4445 {
4446 if (!h->pointer_equality_needed)
4447 abort ();
4448
4449 /* For non-shared object, we can't use .got.plt, which
4450 contains the real function addres if we need pointer
4451 equality. We load the GOT entry with the PLT entry. */
4452 asection *plt = htab->splt ? htab->splt : htab->iplt;
4453 bfd_put_32 (output_bfd,
4454 (plt->output_section->vma
4455 + plt->output_offset + h->plt.offset),
4456 htab->sgot->contents + h->got.offset);
4457 return TRUE;
4458 }
4459 }
4460 else if (info->shared
4461 && SYMBOL_REFERENCES_LOCAL (info, h))
4462 {
4463 BFD_ASSERT((h->got.offset & 1) != 0);
4464 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4465 }
4466 else
4467 {
4468 BFD_ASSERT((h->got.offset & 1) == 0);
4469 do_glob_dat:
4470 bfd_put_32 (output_bfd, (bfd_vma) 0,
4471 htab->sgot->contents + h->got.offset);
4472 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4473 }
4474
4475 loc = htab->srelgot->contents;
4476 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4477 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4478 }
4479
4480 if (h->needs_copy)
4481 {
4482 Elf_Internal_Rela rel;
4483 bfd_byte *loc;
4484
4485 /* This symbol needs a copy reloc. Set it up. */
4486
4487 if (h->dynindx == -1
4488 || (h->root.type != bfd_link_hash_defined
4489 && h->root.type != bfd_link_hash_defweak)
4490 || htab->srelbss == NULL)
4491 abort ();
4492
4493 rel.r_offset = (h->root.u.def.value
4494 + h->root.u.def.section->output_section->vma
4495 + h->root.u.def.section->output_offset);
4496 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4497 loc = htab->srelbss->contents;
4498 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4499 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4500 }
4501
4502 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4503 be NULL for local symbols.
4504
4505 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4506 is relative to the ".got" section. */
4507 if (sym != NULL
4508 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4509 || (!htab->is_vxworks && h == htab->elf.hgot)))
4510 sym->st_shndx = SHN_ABS;
4511
4512 return TRUE;
4513 }
4514
4515 /* Finish up local dynamic symbol handling. We set the contents of
4516 various dynamic sections here. */
4517
4518 static bfd_boolean
4519 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4520 {
4521 struct elf_link_hash_entry *h
4522 = (struct elf_link_hash_entry *) *slot;
4523 struct bfd_link_info *info
4524 = (struct bfd_link_info *) inf;
4525
4526 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4527 h, NULL);
4528 }
4529
4530 /* Used to decide how to sort relocs in an optimal manner for the
4531 dynamic linker, before writing them out. */
4532
4533 static enum elf_reloc_type_class
4534 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4535 {
4536 switch (ELF32_R_TYPE (rela->r_info))
4537 {
4538 case R_386_RELATIVE:
4539 return reloc_class_relative;
4540 case R_386_JUMP_SLOT:
4541 return reloc_class_plt;
4542 case R_386_COPY:
4543 return reloc_class_copy;
4544 default:
4545 return reloc_class_normal;
4546 }
4547 }
4548
4549 /* Finish up the dynamic sections. */
4550
4551 static bfd_boolean
4552 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4553 struct bfd_link_info *info)
4554 {
4555 struct elf_i386_link_hash_table *htab;
4556 bfd *dynobj;
4557 asection *sdyn;
4558
4559 htab = elf_i386_hash_table (info);
4560 dynobj = htab->elf.dynobj;
4561 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4562
4563 if (htab->elf.dynamic_sections_created)
4564 {
4565 Elf32_External_Dyn *dyncon, *dynconend;
4566
4567 if (sdyn == NULL || htab->sgot == NULL)
4568 abort ();
4569
4570 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4571 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4572 for (; dyncon < dynconend; dyncon++)
4573 {
4574 Elf_Internal_Dyn dyn;
4575 asection *s;
4576
4577 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4578
4579 switch (dyn.d_tag)
4580 {
4581 default:
4582 if (htab->is_vxworks
4583 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4584 break;
4585 continue;
4586
4587 case DT_PLTGOT:
4588 s = htab->sgotplt;
4589 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4590 break;
4591
4592 case DT_JMPREL:
4593 s = htab->srelplt;
4594 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4595 break;
4596
4597 case DT_PLTRELSZ:
4598 s = htab->srelplt;
4599 dyn.d_un.d_val = s->size;
4600 break;
4601
4602 case DT_RELSZ:
4603 /* My reading of the SVR4 ABI indicates that the
4604 procedure linkage table relocs (DT_JMPREL) should be
4605 included in the overall relocs (DT_REL). This is
4606 what Solaris does. However, UnixWare can not handle
4607 that case. Therefore, we override the DT_RELSZ entry
4608 here to make it not include the JMPREL relocs. */
4609 s = htab->srelplt;
4610 if (s == NULL)
4611 continue;
4612 dyn.d_un.d_val -= s->size;
4613 break;
4614
4615 case DT_REL:
4616 /* We may not be using the standard ELF linker script.
4617 If .rel.plt is the first .rel section, we adjust
4618 DT_REL to not include it. */
4619 s = htab->srelplt;
4620 if (s == NULL)
4621 continue;
4622 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4623 continue;
4624 dyn.d_un.d_ptr += s->size;
4625 break;
4626 }
4627
4628 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4629 }
4630
4631 /* Fill in the first entry in the procedure linkage table. */
4632 if (htab->splt && htab->splt->size > 0)
4633 {
4634 if (info->shared)
4635 {
4636 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
4637 sizeof (elf_i386_pic_plt0_entry));
4638 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
4639 htab->plt0_pad_byte,
4640 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
4641 }
4642 else
4643 {
4644 memcpy (htab->splt->contents, elf_i386_plt0_entry,
4645 sizeof(elf_i386_plt0_entry));
4646 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
4647 htab->plt0_pad_byte,
4648 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
4649 bfd_put_32 (output_bfd,
4650 (htab->sgotplt->output_section->vma
4651 + htab->sgotplt->output_offset
4652 + 4),
4653 htab->splt->contents + 2);
4654 bfd_put_32 (output_bfd,
4655 (htab->sgotplt->output_section->vma
4656 + htab->sgotplt->output_offset
4657 + 8),
4658 htab->splt->contents + 8);
4659
4660 if (htab->is_vxworks)
4661 {
4662 Elf_Internal_Rela rel;
4663
4664 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4665 On IA32 we use REL relocations so the addend goes in
4666 the PLT directly. */
4667 rel.r_offset = (htab->splt->output_section->vma
4668 + htab->splt->output_offset
4669 + 2);
4670 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4671 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4672 htab->srelplt2->contents);
4673 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4674 rel.r_offset = (htab->splt->output_section->vma
4675 + htab->splt->output_offset
4676 + 8);
4677 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4678 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4679 htab->srelplt2->contents +
4680 sizeof (Elf32_External_Rel));
4681 }
4682 }
4683
4684 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4685 really seem like the right value. */
4686 elf_section_data (htab->splt->output_section)
4687 ->this_hdr.sh_entsize = 4;
4688
4689 /* Correct the .rel.plt.unloaded relocations. */
4690 if (htab->is_vxworks && !info->shared)
4691 {
4692 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
4693 unsigned char *p;
4694
4695 p = htab->srelplt2->contents;
4696 if (info->shared)
4697 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4698 else
4699 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4700
4701 for (; num_plts; num_plts--)
4702 {
4703 Elf_Internal_Rela rel;
4704 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4705 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4706 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4707 p += sizeof (Elf32_External_Rel);
4708
4709 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4710 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4711 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4712 p += sizeof (Elf32_External_Rel);
4713 }
4714 }
4715 }
4716 }
4717
4718 if (htab->sgotplt)
4719 {
4720 /* Fill in the first three entries in the global offset table. */
4721 if (htab->sgotplt->size > 0)
4722 {
4723 bfd_put_32 (output_bfd,
4724 (sdyn == NULL ? 0
4725 : sdyn->output_section->vma + sdyn->output_offset),
4726 htab->sgotplt->contents);
4727 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
4728 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
4729 }
4730
4731 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
4732 }
4733
4734 if (htab->sgot && htab->sgot->size > 0)
4735 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
4736
4737 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4738 htab_traverse (htab->loc_hash_table,
4739 elf_i386_finish_local_dynamic_symbol,
4740 info);
4741
4742 return TRUE;
4743 }
4744
4745 /* Return address for Ith PLT stub in section PLT, for relocation REL
4746 or (bfd_vma) -1 if it should not be included. */
4747
4748 static bfd_vma
4749 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4750 const arelent *rel ATTRIBUTE_UNUSED)
4751 {
4752 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4753 }
4754
4755 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4756
4757 static bfd_boolean
4758 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4759 {
4760 if (h->plt.offset != (bfd_vma) -1
4761 && !h->def_regular
4762 && !h->pointer_equality_needed)
4763 return FALSE;
4764
4765 return _bfd_elf_hash_symbol (h);
4766 }
4767
4768 /* Hook called by the linker routine which adds symbols from an object
4769 file. */
4770
4771 static bfd_boolean
4772 elf_i386_add_symbol_hook (bfd * abfd ATTRIBUTE_UNUSED,
4773 struct bfd_link_info * info ATTRIBUTE_UNUSED,
4774 Elf_Internal_Sym * sym,
4775 const char ** namep ATTRIBUTE_UNUSED,
4776 flagword * flagsp ATTRIBUTE_UNUSED,
4777 asection ** secp ATTRIBUTE_UNUSED,
4778 bfd_vma * valp ATTRIBUTE_UNUSED)
4779 {
4780 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4781 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4782
4783 return TRUE;
4784 }
4785
4786 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4787 #define TARGET_LITTLE_NAME "elf32-i386"
4788 #define ELF_ARCH bfd_arch_i386
4789 #define ELF_MACHINE_CODE EM_386
4790 #define ELF_MAXPAGESIZE 0x1000
4791
4792 #define elf_backend_can_gc_sections 1
4793 #define elf_backend_can_refcount 1
4794 #define elf_backend_want_got_plt 1
4795 #define elf_backend_plt_readonly 1
4796 #define elf_backend_want_plt_sym 0
4797 #define elf_backend_got_header_size 12
4798
4799 /* Support RELA for objdump of prelink objects. */
4800 #define elf_info_to_howto elf_i386_info_to_howto_rel
4801 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4802
4803 #define bfd_elf32_mkobject elf_i386_mkobject
4804
4805 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4806 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4807 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4808 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4809 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4810
4811 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4812 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4813 #define elf_backend_check_relocs elf_i386_check_relocs
4814 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4815 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4816 #define elf_backend_fake_sections elf_i386_fake_sections
4817 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4818 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4819 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4820 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4821 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4822 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4823 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4824 #define elf_backend_relocate_section elf_i386_relocate_section
4825 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4826 #define elf_backend_always_size_sections elf_i386_always_size_sections
4827 #define elf_backend_omit_section_dynsym \
4828 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4829 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4830 #define elf_backend_hash_symbol elf_i386_hash_symbol
4831 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4832 #undef elf_backend_post_process_headers
4833 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4834
4835 #include "elf32-target.h"
4836
4837 /* FreeBSD support. */
4838
4839 #undef TARGET_LITTLE_SYM
4840 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4841 #undef TARGET_LITTLE_NAME
4842 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4843 #undef ELF_OSABI
4844 #define ELF_OSABI ELFOSABI_FREEBSD
4845
4846 /* The kernel recognizes executables as valid only if they carry a
4847 "FreeBSD" label in the ELF header. So we put this label on all
4848 executables and (for simplicity) also all other object files. */
4849
4850 static void
4851 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4852 {
4853 _bfd_elf_set_osabi (abfd, info);
4854
4855 #ifdef OLD_FREEBSD_ABI_LABEL
4856 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4857 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4858 #endif
4859 }
4860
4861 #undef elf_backend_post_process_headers
4862 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4863 #undef elf32_bed
4864 #define elf32_bed elf32_i386_fbsd_bed
4865
4866 #undef elf_backend_add_symbol_hook
4867
4868 #include "elf32-target.h"
4869
4870 /* VxWorks support. */
4871
4872 #undef TARGET_LITTLE_SYM
4873 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4874 #undef TARGET_LITTLE_NAME
4875 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4876 #undef ELF_OSABI
4877
4878 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4879
4880 static struct bfd_link_hash_table *
4881 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4882 {
4883 struct bfd_link_hash_table *ret;
4884 struct elf_i386_link_hash_table *htab;
4885
4886 ret = elf_i386_link_hash_table_create (abfd);
4887 if (ret)
4888 {
4889 htab = (struct elf_i386_link_hash_table *) ret;
4890 htab->is_vxworks = 1;
4891 htab->plt0_pad_byte = 0x90;
4892 }
4893
4894 return ret;
4895 }
4896
4897
4898 #undef elf_backend_relocs_compatible
4899 #undef elf_backend_post_process_headers
4900 #undef bfd_elf32_bfd_link_hash_table_create
4901 #define bfd_elf32_bfd_link_hash_table_create \
4902 elf_i386_vxworks_link_hash_table_create
4903 #undef elf_backend_add_symbol_hook
4904 #define elf_backend_add_symbol_hook \
4905 elf_vxworks_add_symbol_hook
4906 #undef elf_backend_link_output_symbol_hook
4907 #define elf_backend_link_output_symbol_hook \
4908 elf_vxworks_link_output_symbol_hook
4909 #undef elf_backend_emit_relocs
4910 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4911 #undef elf_backend_final_write_processing
4912 #define elf_backend_final_write_processing \
4913 elf_vxworks_final_write_processing
4914
4915 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4916 define it. */
4917 #undef elf_backend_want_plt_sym
4918 #define elf_backend_want_plt_sym 1
4919
4920 #undef elf32_bed
4921 #define elf32_bed elf32_i386_vxworks_bed
4922
4923 #include "elf32-target.h"