projects / deliverable / binutils-gdb.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Add hdynamic to elf_link_hash_table for _DYNAMIC
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf-nacl.h"
29 #include "elf-vxworks.h"
30 #include "bfd_stdint.h"
31 #include "objalloc.h"
32 #include "hashtab.h"
33 #include "dwarf2.h"
34
35 /* 386 uses REL relocations instead of RELA. */
36 #define USE_REL 1
37
38 #include "elf/i386.h"
39
40 static reloc_howto_type elf_howto_table[]=
41 {
42 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_NONE",
44 TRUE, 0x00000000, 0x00000000, FALSE),
45 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_32",
47 TRUE, 0xffffffff, 0xffffffff, FALSE),
48 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_PC32",
50 TRUE, 0xffffffff, 0xffffffff, TRUE),
51 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_GOT32",
53 TRUE, 0xffffffff, 0xffffffff, FALSE),
54 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_PLT32",
56 TRUE, 0xffffffff, 0xffffffff, TRUE),
57 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_COPY",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_RELATIVE",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTOFF",
71 TRUE, 0xffffffff, 0xffffffff, FALSE),
72 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_386_GOTPC",
74 TRUE, 0xffffffff, 0xffffffff, TRUE),
75
76 /* We have a gap in the reloc numbers here.
77 R_386_standard counts the number up to this point, and
78 R_386_ext_offset is the value to subtract from a reloc type of
79 R_386_16 thru R_386_PC8 to form an index into this table. */
80 #define R_386_standard (R_386_GOTPC + 1)
81 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82
83 /* These relocs are a GNU extension. */
84 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_IE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_LE",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_GD",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_TLS_LDM",
101 TRUE, 0xffffffff, 0xffffffff, FALSE),
102 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_16",
104 TRUE, 0xffff, 0xffff, FALSE),
105 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_PC16",
107 TRUE, 0xffff, 0xffff, TRUE),
108 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_386_8",
110 TRUE, 0xff, 0xff, FALSE),
111 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_386_PC8",
113 TRUE, 0xff, 0xff, TRUE),
114
115 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
116 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
117 /* These are common with Solaris TLS implementation. */
118 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
135 TRUE, 0xffffffff, 0xffffffff, FALSE),
136 EMPTY_HOWTO (38),
137 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
142 FALSE, 0, 0, FALSE),
143 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_DESC",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_IRELATIVE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
149
150 /* Another gap. */
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
153
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT, /* type */
156 0, /* rightshift */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
158 0, /* bitsize */
159 FALSE, /* pc_relative */
160 0, /* bitpos */
161 complain_overflow_dont, /* complain_on_overflow */
162 NULL, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE, /* partial_inplace */
165 0, /* src_mask */
166 0, /* dst_mask */
167 FALSE), /* pcrel_offset */
168
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY, /* type */
171 0, /* rightshift */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
173 0, /* bitsize */
174 FALSE, /* pc_relative */
175 0, /* bitpos */
176 complain_overflow_dont, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE, /* partial_inplace */
180 0, /* src_mask */
181 0, /* dst_mask */
182 FALSE) /* pcrel_offset */
183
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185
186 };
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_GOTDESC:
316 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
317 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_DESC_CALL:
320 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
321 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC:
324 TRACE ("BFD_RELOC_386_TLS_DESC");
325 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_IRELATIVE:
328 TRACE ("BFD_RELOC_386_IRELATIVE");
329 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
330
331 case BFD_RELOC_VTABLE_INHERIT:
332 TRACE ("BFD_RELOC_VTABLE_INHERIT");
333 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
334
335 case BFD_RELOC_VTABLE_ENTRY:
336 TRACE ("BFD_RELOC_VTABLE_ENTRY");
337 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
338
339 default:
340 break;
341 }
342
343 TRACE ("Unknown");
344 return 0;
345 }
346
347 static reloc_howto_type *
348 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
349 const char *r_name)
350 {
351 unsigned int i;
352
353 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
354 if (elf_howto_table[i].name != NULL
355 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
356 return &elf_howto_table[i];
357
358 return NULL;
359 }
360
361 static reloc_howto_type *
362 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
363 {
364 unsigned int indx;
365
366 if ((indx = r_type) >= R_386_standard
367 && ((indx = r_type - R_386_ext_offset) - R_386_standard
368 >= R_386_ext - R_386_standard)
369 && ((indx = r_type - R_386_tls_offset) - R_386_ext
370 >= R_386_irelative - R_386_ext)
371 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
372 >= R_386_vt - R_386_irelative))
373 {
374 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
375 abfd, (int) r_type);
376 indx = R_386_NONE;
377 }
378 BFD_ASSERT (elf_howto_table [indx].type == r_type);
379 return &elf_howto_table[indx];
380 }
381
382 static void
383 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
384 arelent *cache_ptr,
385 Elf_Internal_Rela *dst)
386 {
387 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
388 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
389 }
390
391 /* Return whether a symbol name implies a local label. The UnixWare
392 2.1 cc generates temporary symbols that start with .X, so we
393 recognize them here. FIXME: do other SVR4 compilers also use .X?.
394 If so, we should move the .X recognition into
395 _bfd_elf_is_local_label_name. */
396
397 static bfd_boolean
398 elf_i386_is_local_label_name (bfd *abfd, const char *name)
399 {
400 if (name[0] == '.' && name[1] == 'X')
401 return TRUE;
402
403 return _bfd_elf_is_local_label_name (abfd, name);
404 }
405 \f
406 /* Support for core dump NOTE sections. */
407
408 static bfd_boolean
409 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
410 {
411 int offset;
412 size_t size;
413
414 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
415 {
416 int pr_version = bfd_get_32 (abfd, note->descdata);
417
418 if (pr_version != 1)
419 return FALSE;
420
421 /* pr_cursig */
422 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
423
424 /* pr_pid */
425 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
426
427 /* pr_reg */
428 offset = 28;
429 size = bfd_get_32 (abfd, note->descdata + 8);
430 }
431 else
432 {
433 switch (note->descsz)
434 {
435 default:
436 return FALSE;
437
438 case 144: /* Linux/i386 */
439 /* pr_cursig */
440 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
441
442 /* pr_pid */
443 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
444
445 /* pr_reg */
446 offset = 72;
447 size = 68;
448
449 break;
450 }
451 }
452
453 /* Make a ".reg/999" section. */
454 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
455 size, note->descpos + offset);
456 }
457
458 static bfd_boolean
459 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
460 {
461 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
462 {
463 int pr_version = bfd_get_32 (abfd, note->descdata);
464
465 if (pr_version != 1)
466 return FALSE;
467
468 elf_tdata (abfd)->core_program
469 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
470 elf_tdata (abfd)->core_command
471 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
472 }
473 else
474 {
475 switch (note->descsz)
476 {
477 default:
478 return FALSE;
479
480 case 124: /* Linux/i386 elf_prpsinfo. */
481 elf_tdata (abfd)->core_pid
482 = bfd_get_32 (abfd, note->descdata + 12);
483 elf_tdata (abfd)->core_program
484 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
485 elf_tdata (abfd)->core_command
486 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
487 }
488 }
489
490 /* Note that for some reason, a spurious space is tacked
491 onto the end of the args in some (at least one anyway)
492 implementations, so strip it off if it exists. */
493 {
494 char *command = elf_tdata (abfd)->core_command;
495 int n = strlen (command);
496
497 if (0 < n && command[n - 1] == ' ')
498 command[n - 1] = '\0';
499 }
500
501 return TRUE;
502 }
503 \f
504 /* Functions for the i386 ELF linker.
505
506 In order to gain some understanding of code in this file without
507 knowing all the intricate details of the linker, note the
508 following:
509
510 Functions named elf_i386_* are called by external routines, other
511 functions are only called locally. elf_i386_* functions appear
512 in this file more or less in the order in which they are called
513 from external routines. eg. elf_i386_check_relocs is called
514 early in the link process, elf_i386_finish_dynamic_sections is
515 one of the last functions. */
516
517
518 /* The name of the dynamic interpreter. This is put in the .interp
519 section. */
520
521 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
522
523 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
524 copying dynamic variables from a shared lib into an app's dynbss
525 section, and instead use a dynamic relocation to point into the
526 shared lib. */
527 #define ELIMINATE_COPY_RELOCS 1
528
529 /* The size in bytes of an entry in the procedure linkage table. */
530
531 #define PLT_ENTRY_SIZE 16
532
533 /* The first entry in an absolute procedure linkage table looks like
534 this. See the SVR4 ABI i386 supplement to see how this works.
535 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
536
537 static const bfd_byte elf_i386_plt0_entry[12] =
538 {
539 0xff, 0x35, /* pushl contents of address */
540 0, 0, 0, 0, /* replaced with address of .got + 4. */
541 0xff, 0x25, /* jmp indirect */
542 0, 0, 0, 0 /* replaced with address of .got + 8. */
543 };
544
545 /* Subsequent entries in an absolute procedure linkage table look like
546 this. */
547
548 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
549 {
550 0xff, 0x25, /* jmp indirect */
551 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
552 0x68, /* pushl immediate */
553 0, 0, 0, 0, /* replaced with offset into relocation table. */
554 0xe9, /* jmp relative */
555 0, 0, 0, 0 /* replaced with offset to start of .plt. */
556 };
557
558 /* The first entry in a PIC procedure linkage table look like this.
559 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
560
561 static const bfd_byte elf_i386_pic_plt0_entry[12] =
562 {
563 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
564 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
565 };
566
567 /* Subsequent entries in a PIC procedure linkage table look like this. */
568
569 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
570 {
571 0xff, 0xa3, /* jmp *offset(%ebx) */
572 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
573 0x68, /* pushl immediate */
574 0, 0, 0, 0, /* replaced with offset into relocation table. */
575 0xe9, /* jmp relative */
576 0, 0, 0, 0 /* replaced with offset to start of .plt. */
577 };
578
579 /* .eh_frame covering the .plt section. */
580
581 static const bfd_byte elf_i386_eh_frame_plt[] =
582 {
583 #define PLT_CIE_LENGTH 20
584 #define PLT_FDE_LENGTH 36
585 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
586 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
587 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
588 0, 0, 0, 0, /* CIE ID */
589 1, /* CIE version */
590 'z', 'R', 0, /* Augmentation string */
591 1, /* Code alignment factor */
592 0x7c, /* Data alignment factor */
593 8, /* Return address column */
594 1, /* Augmentation size */
595 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
596 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
597 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
598 DW_CFA_nop, DW_CFA_nop,
599
600 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
601 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
602 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
603 0, 0, 0, 0, /* .plt size goes here */
604 0, /* Augmentation size */
605 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
606 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
607 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
608 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
609 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
610 11, /* Block length */
611 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
612 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
613 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
614 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
615 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
616 };
617
618 struct elf_i386_plt_layout
619 {
620 /* The first entry in an absolute procedure linkage table looks like this. */
621 const bfd_byte *plt0_entry;
622 unsigned int plt0_entry_size;
623
624 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
625 unsigned int plt0_got1_offset;
626 unsigned int plt0_got2_offset;
627
628 /* Later entries in an absolute procedure linkage table look like this. */
629 const bfd_byte *plt_entry;
630 unsigned int plt_entry_size;
631
632 /* Offsets into plt_entry that are to be replaced with... */
633 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
634 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
635 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
636
637 /* Offset into plt_entry where the initial value of the GOT entry points. */
638 unsigned int plt_lazy_offset;
639
640 /* The first entry in a PIC procedure linkage table looks like this. */
641 const bfd_byte *pic_plt0_entry;
642
643 /* Subsequent entries in a PIC procedure linkage table look like this. */
644 const bfd_byte *pic_plt_entry;
645
646 /* .eh_frame covering the .plt section. */
647 const bfd_byte *eh_frame_plt;
648 unsigned int eh_frame_plt_size;
649 };
650
651 #define GET_PLT_ENTRY_SIZE(abfd) \
652 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
653
654 /* These are the standard parameters. */
655 static const struct elf_i386_plt_layout elf_i386_plt =
656 {
657 elf_i386_plt0_entry, /* plt0_entry */
658 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
659 2, /* plt0_got1_offset */
660 8, /* plt0_got2_offset */
661 elf_i386_plt_entry, /* plt_entry */
662 PLT_ENTRY_SIZE, /* plt_entry_size */
663 2, /* plt_got_offset */
664 7, /* plt_reloc_offset */
665 12, /* plt_plt_offset */
666 6, /* plt_lazy_offset */
667 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
668 elf_i386_pic_plt_entry, /* pic_plt_entry */
669 elf_i386_eh_frame_plt, /* eh_frame_plt */
670 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
671 };
672 \f
673
674 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
675 for the PLTResolve stub and then for each PLT entry. */
676 #define PLTRESOLVE_RELOCS_SHLIB 0
677 #define PLTRESOLVE_RELOCS 2
678 #define PLT_NON_JUMP_SLOT_RELOCS 2
679
680 /* Architecture-specific backend data for i386. */
681
682 struct elf_i386_backend_data
683 {
684 /* Parameters describing PLT generation. */
685 const struct elf_i386_plt_layout *plt;
686
687 /* Value used to fill the unused bytes of the first PLT entry. */
688 bfd_byte plt0_pad_byte;
689
690 /* True if the target system is VxWorks. */
691 int is_vxworks;
692 };
693
694 #define get_elf_i386_backend_data(abfd) \
695 ((const struct elf_i386_backend_data *) \
696 get_elf_backend_data (abfd)->arch_data)
697
698 /* These are the standard parameters. */
699 static const struct elf_i386_backend_data elf_i386_arch_bed =
700 {
701 &elf_i386_plt, /* plt */
702 0, /* plt0_pad_byte */
703 0, /* is_vxworks */
704 };
705
706 #define elf_backend_arch_data &elf_i386_arch_bed
707
708 /* i386 ELF linker hash entry. */
709
710 struct elf_i386_link_hash_entry
711 {
712 struct elf_link_hash_entry elf;
713
714 /* Track dynamic relocs copied for this symbol. */
715 struct elf_dyn_relocs *dyn_relocs;
716
717 #define GOT_UNKNOWN 0
718 #define GOT_NORMAL 1
719 #define GOT_TLS_GD 2
720 #define GOT_TLS_IE 4
721 #define GOT_TLS_IE_POS 5
722 #define GOT_TLS_IE_NEG 6
723 #define GOT_TLS_IE_BOTH 7
724 #define GOT_TLS_GDESC 8
725 #define GOT_TLS_GD_BOTH_P(type) \
726 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
727 #define GOT_TLS_GD_P(type) \
728 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
729 #define GOT_TLS_GDESC_P(type) \
730 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
731 #define GOT_TLS_GD_ANY_P(type) \
732 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
733 unsigned char tls_type;
734
735 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
736 starting at the end of the jump table. */
737 bfd_vma tlsdesc_got;
738 };
739
740 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
741
742 struct elf_i386_obj_tdata
743 {
744 struct elf_obj_tdata root;
745
746 /* tls_type for each local got entry. */
747 char *local_got_tls_type;
748
749 /* GOTPLT entries for TLS descriptors. */
750 bfd_vma *local_tlsdesc_gotent;
751 };
752
753 #define elf_i386_tdata(abfd) \
754 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
755
756 #define elf_i386_local_got_tls_type(abfd) \
757 (elf_i386_tdata (abfd)->local_got_tls_type)
758
759 #define elf_i386_local_tlsdesc_gotent(abfd) \
760 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
761
762 #define is_i386_elf(bfd) \
763 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
764 && elf_tdata (bfd) != NULL \
765 && elf_object_id (bfd) == I386_ELF_DATA)
766
767 static bfd_boolean
768 elf_i386_mkobject (bfd *abfd)
769 {
770 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
771 I386_ELF_DATA);
772 }
773
774 /* i386 ELF linker hash table. */
775
776 struct elf_i386_link_hash_table
777 {
778 struct elf_link_hash_table elf;
779
780 /* Short-cuts to get to dynamic linker sections. */
781 asection *sdynbss;
782 asection *srelbss;
783 asection *plt_eh_frame;
784
785 union
786 {
787 bfd_signed_vma refcount;
788 bfd_vma offset;
789 } tls_ldm_got;
790
791 /* The amount of space used by the reserved portion of the sgotplt
792 section, plus whatever space is used by the jump slots. */
793 bfd_vma sgotplt_jump_table_size;
794
795 /* Small local sym cache. */
796 struct sym_cache sym_cache;
797
798 /* _TLS_MODULE_BASE_ symbol. */
799 struct bfd_link_hash_entry *tls_module_base;
800
801 /* Used by local STT_GNU_IFUNC symbols. */
802 htab_t loc_hash_table;
803 void * loc_hash_memory;
804
805 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
806 asection *srelplt2;
807
808 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
809 bfd_vma next_tls_desc_index;
810
811 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
812 bfd_vma next_jump_slot_index;
813
814 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
815 bfd_vma next_irelative_index;
816 };
817
818 /* Get the i386 ELF linker hash table from a link_info structure. */
819
820 #define elf_i386_hash_table(p) \
821 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
822 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
823
824 #define elf_i386_compute_jump_table_size(htab) \
825 ((htab)->next_tls_desc_index * 4)
826
827 /* Create an entry in an i386 ELF linker hash table. */
828
829 static struct bfd_hash_entry *
830 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
831 struct bfd_hash_table *table,
832 const char *string)
833 {
834 /* Allocate the structure if it has not already been allocated by a
835 subclass. */
836 if (entry == NULL)
837 {
838 entry = (struct bfd_hash_entry *)
839 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
840 if (entry == NULL)
841 return entry;
842 }
843
844 /* Call the allocation method of the superclass. */
845 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
846 if (entry != NULL)
847 {
848 struct elf_i386_link_hash_entry *eh;
849
850 eh = (struct elf_i386_link_hash_entry *) entry;
851 eh->dyn_relocs = NULL;
852 eh->tls_type = GOT_UNKNOWN;
853 eh->tlsdesc_got = (bfd_vma) -1;
854 }
855
856 return entry;
857 }
858
859 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
860 for local symbol so that we can handle local STT_GNU_IFUNC symbols
861 as global symbol. We reuse indx and dynstr_index for local symbol
862 hash since they aren't used by global symbols in this backend. */
863
864 static hashval_t
865 elf_i386_local_htab_hash (const void *ptr)
866 {
867 struct elf_link_hash_entry *h
868 = (struct elf_link_hash_entry *) ptr;
869 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
870 }
871
872 /* Compare local hash entries. */
873
874 static int
875 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
876 {
877 struct elf_link_hash_entry *h1
878 = (struct elf_link_hash_entry *) ptr1;
879 struct elf_link_hash_entry *h2
880 = (struct elf_link_hash_entry *) ptr2;
881
882 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
883 }
884
885 /* Find and/or create a hash entry for local symbol. */
886
887 static struct elf_link_hash_entry *
888 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
889 bfd *abfd, const Elf_Internal_Rela *rel,
890 bfd_boolean create)
891 {
892 struct elf_i386_link_hash_entry e, *ret;
893 asection *sec = abfd->sections;
894 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
895 ELF32_R_SYM (rel->r_info));
896 void **slot;
897
898 e.elf.indx = sec->id;
899 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
900 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
901 create ? INSERT : NO_INSERT);
902
903 if (!slot)
904 return NULL;
905
906 if (*slot)
907 {
908 ret = (struct elf_i386_link_hash_entry *) *slot;
909 return &ret->elf;
910 }
911
912 ret = (struct elf_i386_link_hash_entry *)
913 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
914 sizeof (struct elf_i386_link_hash_entry));
915 if (ret)
916 {
917 memset (ret, 0, sizeof (*ret));
918 ret->elf.indx = sec->id;
919 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
920 ret->elf.dynindx = -1;
921 *slot = ret;
922 }
923 return &ret->elf;
924 }
925
926 /* Create an i386 ELF linker hash table. */
927
928 static struct bfd_link_hash_table *
929 elf_i386_link_hash_table_create (bfd *abfd)
930 {
931 struct elf_i386_link_hash_table *ret;
932 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
933
934 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
935 if (ret == NULL)
936 return NULL;
937
938 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
939 elf_i386_link_hash_newfunc,
940 sizeof (struct elf_i386_link_hash_entry),
941 I386_ELF_DATA))
942 {
943 free (ret);
944 return NULL;
945 }
946
947 ret->sdynbss = NULL;
948 ret->srelbss = NULL;
949 ret->plt_eh_frame = NULL;
950 ret->tls_ldm_got.refcount = 0;
951 ret->next_tls_desc_index = 0;
952 ret->sgotplt_jump_table_size = 0;
953 ret->sym_cache.abfd = NULL;
954 ret->srelplt2 = NULL;
955 ret->tls_module_base = NULL;
956 ret->next_jump_slot_index = 0;
957 ret->next_irelative_index = 0;
958
959 ret->loc_hash_table = htab_try_create (1024,
960 elf_i386_local_htab_hash,
961 elf_i386_local_htab_eq,
962 NULL);
963 ret->loc_hash_memory = objalloc_create ();
964 if (!ret->loc_hash_table || !ret->loc_hash_memory)
965 {
966 free (ret);
967 return NULL;
968 }
969
970 return &ret->elf.root;
971 }
972
973 /* Destroy an i386 ELF linker hash table. */
974
975 static void
976 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
977 {
978 struct elf_i386_link_hash_table *htab
979 = (struct elf_i386_link_hash_table *) hash;
980
981 if (htab->loc_hash_table)
982 htab_delete (htab->loc_hash_table);
983 if (htab->loc_hash_memory)
984 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
985 _bfd_generic_link_hash_table_free (hash);
986 }
987
988 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
989 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
990 hash table. */
991
992 static bfd_boolean
993 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
994 {
995 struct elf_i386_link_hash_table *htab;
996
997 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
998 return FALSE;
999
1000 htab = elf_i386_hash_table (info);
1001 if (htab == NULL)
1002 return FALSE;
1003
1004 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1005 if (!info->shared)
1006 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1007
1008 if (!htab->sdynbss
1009 || (!info->shared && !htab->srelbss))
1010 abort ();
1011
1012 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1013 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1014 &htab->srelplt2))
1015 return FALSE;
1016
1017 if (!info->no_ld_generated_unwind_info
1018 && htab->plt_eh_frame == NULL
1019 && htab->elf.splt != NULL)
1020 {
1021 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1022 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1023 | SEC_LINKER_CREATED);
1024 htab->plt_eh_frame
1025 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1026 if (htab->plt_eh_frame == NULL
1027 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1028 return FALSE;
1029 }
1030
1031 return TRUE;
1032 }
1033
1034 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1035
1036 static void
1037 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1038 struct elf_link_hash_entry *dir,
1039 struct elf_link_hash_entry *ind)
1040 {
1041 struct elf_i386_link_hash_entry *edir, *eind;
1042
1043 edir = (struct elf_i386_link_hash_entry *) dir;
1044 eind = (struct elf_i386_link_hash_entry *) ind;
1045
1046 if (eind->dyn_relocs != NULL)
1047 {
1048 if (edir->dyn_relocs != NULL)
1049 {
1050 struct elf_dyn_relocs **pp;
1051 struct elf_dyn_relocs *p;
1052
1053 /* Add reloc counts against the indirect sym to the direct sym
1054 list. Merge any entries against the same section. */
1055 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1056 {
1057 struct elf_dyn_relocs *q;
1058
1059 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1060 if (q->sec == p->sec)
1061 {
1062 q->pc_count += p->pc_count;
1063 q->count += p->count;
1064 *pp = p->next;
1065 break;
1066 }
1067 if (q == NULL)
1068 pp = &p->next;
1069 }
1070 *pp = edir->dyn_relocs;
1071 }
1072
1073 edir->dyn_relocs = eind->dyn_relocs;
1074 eind->dyn_relocs = NULL;
1075 }
1076
1077 if (ind->root.type == bfd_link_hash_indirect
1078 && dir->got.refcount <= 0)
1079 {
1080 edir->tls_type = eind->tls_type;
1081 eind->tls_type = GOT_UNKNOWN;
1082 }
1083
1084 if (ELIMINATE_COPY_RELOCS
1085 && ind->root.type != bfd_link_hash_indirect
1086 && dir->dynamic_adjusted)
1087 {
1088 /* If called to transfer flags for a weakdef during processing
1089 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1090 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1091 dir->ref_dynamic |= ind->ref_dynamic;
1092 dir->ref_regular |= ind->ref_regular;
1093 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1094 dir->needs_plt |= ind->needs_plt;
1095 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1096 }
1097 else
1098 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1099 }
1100
1101 /* Return TRUE if the TLS access code sequence support transition
1102 from R_TYPE. */
1103
1104 static bfd_boolean
1105 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1106 bfd_byte *contents,
1107 Elf_Internal_Shdr *symtab_hdr,
1108 struct elf_link_hash_entry **sym_hashes,
1109 unsigned int r_type,
1110 const Elf_Internal_Rela *rel,
1111 const Elf_Internal_Rela *relend)
1112 {
1113 unsigned int val, type;
1114 unsigned long r_symndx;
1115 struct elf_link_hash_entry *h;
1116 bfd_vma offset;
1117
1118 /* Get the section contents. */
1119 if (contents == NULL)
1120 {
1121 if (elf_section_data (sec)->this_hdr.contents != NULL)
1122 contents = elf_section_data (sec)->this_hdr.contents;
1123 else
1124 {
1125 /* FIXME: How to better handle error condition? */
1126 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1127 return FALSE;
1128
1129 /* Cache the section contents for elf_link_input_bfd. */
1130 elf_section_data (sec)->this_hdr.contents = contents;
1131 }
1132 }
1133
1134 offset = rel->r_offset;
1135 switch (r_type)
1136 {
1137 case R_386_TLS_GD:
1138 case R_386_TLS_LDM:
1139 if (offset < 2 || (rel + 1) >= relend)
1140 return FALSE;
1141
1142 type = bfd_get_8 (abfd, contents + offset - 2);
1143 if (r_type == R_386_TLS_GD)
1144 {
1145 /* Check transition from GD access model. Only
1146 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1147 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1148 can transit to different access model. */
1149 if ((offset + 10) > sec->size ||
1150 (type != 0x8d && type != 0x04))
1151 return FALSE;
1152
1153 val = bfd_get_8 (abfd, contents + offset - 1);
1154 if (type == 0x04)
1155 {
1156 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1157 if (offset < 3)
1158 return FALSE;
1159
1160 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1161 return FALSE;
1162
1163 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1164 return FALSE;
1165 }
1166 else
1167 {
1168 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1169 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1170 return FALSE;
1171
1172 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1173 return FALSE;
1174 }
1175 }
1176 else
1177 {
1178 /* Check transition from LD access model. Only
1179 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1180 can transit to different access model. */
1181 if (type != 0x8d || (offset + 9) > sec->size)
1182 return FALSE;
1183
1184 val = bfd_get_8 (abfd, contents + offset - 1);
1185 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1186 return FALSE;
1187 }
1188
1189 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1190 return FALSE;
1191
1192 r_symndx = ELF32_R_SYM (rel[1].r_info);
1193 if (r_symndx < symtab_hdr->sh_info)
1194 return FALSE;
1195
1196 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1197 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1198 may be versioned. */
1199 return (h != NULL
1200 && h->root.root.string != NULL
1201 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1202 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1203 && (strncmp (h->root.root.string, "___tls_get_addr",
1204 15) == 0));
1205
1206 case R_386_TLS_IE:
1207 /* Check transition from IE access model:
1208 movl foo@indntpoff(%rip), %eax
1209 movl foo@indntpoff(%rip), %reg
1210 addl foo@indntpoff(%rip), %reg
1211 */
1212
1213 if (offset < 1 || (offset + 4) > sec->size)
1214 return FALSE;
1215
1216 /* Check "movl foo@tpoff(%rip), %eax" first. */
1217 val = bfd_get_8 (abfd, contents + offset - 1);
1218 if (val == 0xa1)
1219 return TRUE;
1220
1221 if (offset < 2)
1222 return FALSE;
1223
1224 /* Check movl|addl foo@tpoff(%rip), %reg. */
1225 type = bfd_get_8 (abfd, contents + offset - 2);
1226 return ((type == 0x8b || type == 0x03)
1227 && (val & 0xc7) == 0x05);
1228
1229 case R_386_TLS_GOTIE:
1230 case R_386_TLS_IE_32:
1231 /* Check transition from {IE_32,GOTIE} access model:
1232 subl foo@{tpoff,gontoff}(%reg1), %reg2
1233 movl foo@{tpoff,gontoff}(%reg1), %reg2
1234 addl foo@{tpoff,gontoff}(%reg1), %reg2
1235 */
1236
1237 if (offset < 2 || (offset + 4) > sec->size)
1238 return FALSE;
1239
1240 val = bfd_get_8 (abfd, contents + offset - 1);
1241 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1242 return FALSE;
1243
1244 type = bfd_get_8 (abfd, contents + offset - 2);
1245 return type == 0x8b || type == 0x2b || type == 0x03;
1246
1247 case R_386_TLS_GOTDESC:
1248 /* Check transition from GDesc access model:
1249 leal x@tlsdesc(%ebx), %eax
1250
1251 Make sure it's a leal adding ebx to a 32-bit offset
1252 into any register, although it's probably almost always
1253 going to be eax. */
1254
1255 if (offset < 2 || (offset + 4) > sec->size)
1256 return FALSE;
1257
1258 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1259 return FALSE;
1260
1261 val = bfd_get_8 (abfd, contents + offset - 1);
1262 return (val & 0xc7) == 0x83;
1263
1264 case R_386_TLS_DESC_CALL:
1265 /* Check transition from GDesc access model:
1266 call *x@tlsdesc(%rax)
1267 */
1268 if (offset + 2 <= sec->size)
1269 {
1270 /* Make sure that it's a call *x@tlsdesc(%rax). */
1271 static const unsigned char call[] = { 0xff, 0x10 };
1272 return memcmp (contents + offset, call, 2) == 0;
1273 }
1274
1275 return FALSE;
1276
1277 default:
1278 abort ();
1279 }
1280 }
1281
1282 /* Return TRUE if the TLS access transition is OK or no transition
1283 will be performed. Update R_TYPE if there is a transition. */
1284
1285 static bfd_boolean
1286 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1287 asection *sec, bfd_byte *contents,
1288 Elf_Internal_Shdr *symtab_hdr,
1289 struct elf_link_hash_entry **sym_hashes,
1290 unsigned int *r_type, int tls_type,
1291 const Elf_Internal_Rela *rel,
1292 const Elf_Internal_Rela *relend,
1293 struct elf_link_hash_entry *h,
1294 unsigned long r_symndx)
1295 {
1296 unsigned int from_type = *r_type;
1297 unsigned int to_type = from_type;
1298 bfd_boolean check = TRUE;
1299
1300 /* Skip TLS transition for functions. */
1301 if (h != NULL
1302 && (h->type == STT_FUNC
1303 || h->type == STT_GNU_IFUNC))
1304 return TRUE;
1305
1306 switch (from_type)
1307 {
1308 case R_386_TLS_GD:
1309 case R_386_TLS_GOTDESC:
1310 case R_386_TLS_DESC_CALL:
1311 case R_386_TLS_IE_32:
1312 case R_386_TLS_IE:
1313 case R_386_TLS_GOTIE:
1314 if (info->executable)
1315 {
1316 if (h == NULL)
1317 to_type = R_386_TLS_LE_32;
1318 else if (from_type != R_386_TLS_IE
1319 && from_type != R_386_TLS_GOTIE)
1320 to_type = R_386_TLS_IE_32;
1321 }
1322
1323 /* When we are called from elf_i386_relocate_section, CONTENTS
1324 isn't NULL and there may be additional transitions based on
1325 TLS_TYPE. */
1326 if (contents != NULL)
1327 {
1328 unsigned int new_to_type = to_type;
1329
1330 if (info->executable
1331 && h != NULL
1332 && h->dynindx == -1
1333 && (tls_type & GOT_TLS_IE))
1334 new_to_type = R_386_TLS_LE_32;
1335
1336 if (to_type == R_386_TLS_GD
1337 || to_type == R_386_TLS_GOTDESC
1338 || to_type == R_386_TLS_DESC_CALL)
1339 {
1340 if (tls_type == GOT_TLS_IE_POS)
1341 new_to_type = R_386_TLS_GOTIE;
1342 else if (tls_type & GOT_TLS_IE)
1343 new_to_type = R_386_TLS_IE_32;
1344 }
1345
1346 /* We checked the transition before when we were called from
1347 elf_i386_check_relocs. We only want to check the new
1348 transition which hasn't been checked before. */
1349 check = new_to_type != to_type && from_type == to_type;
1350 to_type = new_to_type;
1351 }
1352
1353 break;
1354
1355 case R_386_TLS_LDM:
1356 if (info->executable)
1357 to_type = R_386_TLS_LE_32;
1358 break;
1359
1360 default:
1361 return TRUE;
1362 }
1363
1364 /* Return TRUE if there is no transition. */
1365 if (from_type == to_type)
1366 return TRUE;
1367
1368 /* Check if the transition can be performed. */
1369 if (check
1370 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1371 symtab_hdr, sym_hashes,
1372 from_type, rel, relend))
1373 {
1374 reloc_howto_type *from, *to;
1375 const char *name;
1376
1377 from = elf_i386_rtype_to_howto (abfd, from_type);
1378 to = elf_i386_rtype_to_howto (abfd, to_type);
1379
1380 if (h)
1381 name = h->root.root.string;
1382 else
1383 {
1384 struct elf_i386_link_hash_table *htab;
1385
1386 htab = elf_i386_hash_table (info);
1387 if (htab == NULL)
1388 name = "*unknown*";
1389 else
1390 {
1391 Elf_Internal_Sym *isym;
1392
1393 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1394 abfd, r_symndx);
1395 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1396 }
1397 }
1398
1399 (*_bfd_error_handler)
1400 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1401 "in section `%A' failed"),
1402 abfd, sec, from->name, to->name, name,
1403 (unsigned long) rel->r_offset);
1404 bfd_set_error (bfd_error_bad_value);
1405 return FALSE;
1406 }
1407
1408 *r_type = to_type;
1409 return TRUE;
1410 }
1411
1412 /* Look through the relocs for a section during the first phase, and
1413 calculate needed space in the global offset table, procedure linkage
1414 table, and dynamic reloc sections. */
1415
1416 static bfd_boolean
1417 elf_i386_check_relocs (bfd *abfd,
1418 struct bfd_link_info *info,
1419 asection *sec,
1420 const Elf_Internal_Rela *relocs)
1421 {
1422 struct elf_i386_link_hash_table *htab;
1423 Elf_Internal_Shdr *symtab_hdr;
1424 struct elf_link_hash_entry **sym_hashes;
1425 const Elf_Internal_Rela *rel;
1426 const Elf_Internal_Rela *rel_end;
1427 asection *sreloc;
1428
1429 if (info->relocatable)
1430 return TRUE;
1431
1432 BFD_ASSERT (is_i386_elf (abfd));
1433
1434 htab = elf_i386_hash_table (info);
1435 if (htab == NULL)
1436 return FALSE;
1437
1438 symtab_hdr = &elf_symtab_hdr (abfd);
1439 sym_hashes = elf_sym_hashes (abfd);
1440
1441 sreloc = NULL;
1442
1443 rel_end = relocs + sec->reloc_count;
1444 for (rel = relocs; rel < rel_end; rel++)
1445 {
1446 unsigned int r_type;
1447 unsigned long r_symndx;
1448 struct elf_link_hash_entry *h;
1449 Elf_Internal_Sym *isym;
1450 const char *name;
1451
1452 r_symndx = ELF32_R_SYM (rel->r_info);
1453 r_type = ELF32_R_TYPE (rel->r_info);
1454
1455 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1456 {
1457 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1458 abfd,
1459 r_symndx);
1460 return FALSE;
1461 }
1462
1463 if (r_symndx < symtab_hdr->sh_info)
1464 {
1465 /* A local symbol. */
1466 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1467 abfd, r_symndx);
1468 if (isym == NULL)
1469 return FALSE;
1470
1471 /* Check relocation against local STT_GNU_IFUNC symbol. */
1472 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1473 {
1474 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1475 if (h == NULL)
1476 return FALSE;
1477
1478 /* Fake a STT_GNU_IFUNC symbol. */
1479 h->type = STT_GNU_IFUNC;
1480 h->def_regular = 1;
1481 h->ref_regular = 1;
1482 h->forced_local = 1;
1483 h->root.type = bfd_link_hash_defined;
1484 }
1485 else
1486 h = NULL;
1487 }
1488 else
1489 {
1490 isym = NULL;
1491 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1492 while (h->root.type == bfd_link_hash_indirect
1493 || h->root.type == bfd_link_hash_warning)
1494 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1495 }
1496
1497 if (h != NULL)
1498 {
1499 /* Create the ifunc sections for static executables. If we
1500 never see an indirect function symbol nor we are building
1501 a static executable, those sections will be empty and
1502 won't appear in output. */
1503 switch (r_type)
1504 {
1505 default:
1506 break;
1507
1508 case R_386_32:
1509 case R_386_PC32:
1510 case R_386_PLT32:
1511 case R_386_GOT32:
1512 case R_386_GOTOFF:
1513 if (htab->elf.dynobj == NULL)
1514 htab->elf.dynobj = abfd;
1515 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1516 return FALSE;
1517 break;
1518 }
1519
1520 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1521 it here if it is defined in a non-shared object. */
1522 if (h->type == STT_GNU_IFUNC
1523 && h->def_regular)
1524 {
1525 /* It is referenced by a non-shared object. */
1526 h->ref_regular = 1;
1527 h->needs_plt = 1;
1528
1529 /* STT_GNU_IFUNC symbol must go through PLT. */
1530 h->plt.refcount += 1;
1531
1532 /* STT_GNU_IFUNC needs dynamic sections. */
1533 if (htab->elf.dynobj == NULL)
1534 htab->elf.dynobj = abfd;
1535
1536 switch (r_type)
1537 {
1538 default:
1539 if (h->root.root.string)
1540 name = h->root.root.string;
1541 else
1542 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1543 NULL);
1544 (*_bfd_error_handler)
1545 (_("%B: relocation %s against STT_GNU_IFUNC "
1546 "symbol `%s' isn't handled by %s"), abfd,
1547 elf_howto_table[r_type].name,
1548 name, __FUNCTION__);
1549 bfd_set_error (bfd_error_bad_value);
1550 return FALSE;
1551
1552 case R_386_32:
1553 h->non_got_ref = 1;
1554 h->pointer_equality_needed = 1;
1555 if (info->shared)
1556 {
1557 /* We must copy these reloc types into the
1558 output file. Create a reloc section in
1559 dynobj and make room for this reloc. */
1560 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1561 (abfd, info, sec, sreloc,
1562 &((struct elf_i386_link_hash_entry *) h)->dyn_relocs);
1563 if (sreloc == NULL)
1564 return FALSE;
1565 }
1566 break;
1567
1568 case R_386_PC32:
1569 h->non_got_ref = 1;
1570 break;
1571
1572 case R_386_PLT32:
1573 break;
1574
1575 case R_386_GOT32:
1576 case R_386_GOTOFF:
1577 h->got.refcount += 1;
1578 if (htab->elf.sgot == NULL
1579 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1580 info))
1581 return FALSE;
1582 break;
1583 }
1584
1585 continue;
1586 }
1587 }
1588
1589 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1590 symtab_hdr, sym_hashes,
1591 &r_type, GOT_UNKNOWN,
1592 rel, rel_end, h, r_symndx))
1593 return FALSE;
1594
1595 switch (r_type)
1596 {
1597 case R_386_TLS_LDM:
1598 htab->tls_ldm_got.refcount += 1;
1599 goto create_got;
1600
1601 case R_386_PLT32:
1602 /* This symbol requires a procedure linkage table entry. We
1603 actually build the entry in adjust_dynamic_symbol,
1604 because this might be a case of linking PIC code which is
1605 never referenced by a dynamic object, in which case we
1606 don't need to generate a procedure linkage table entry
1607 after all. */
1608
1609 /* If this is a local symbol, we resolve it directly without
1610 creating a procedure linkage table entry. */
1611 if (h == NULL)
1612 continue;
1613
1614 h->needs_plt = 1;
1615 h->plt.refcount += 1;
1616 break;
1617
1618 case R_386_TLS_IE_32:
1619 case R_386_TLS_IE:
1620 case R_386_TLS_GOTIE:
1621 if (!info->executable)
1622 info->flags |= DF_STATIC_TLS;
1623 /* Fall through */
1624
1625 case R_386_GOT32:
1626 case R_386_TLS_GD:
1627 case R_386_TLS_GOTDESC:
1628 case R_386_TLS_DESC_CALL:
1629 /* This symbol requires a global offset table entry. */
1630 {
1631 int tls_type, old_tls_type;
1632
1633 switch (r_type)
1634 {
1635 default:
1636 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1637 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1638 case R_386_TLS_GOTDESC:
1639 case R_386_TLS_DESC_CALL:
1640 tls_type = GOT_TLS_GDESC; break;
1641 case R_386_TLS_IE_32:
1642 if (ELF32_R_TYPE (rel->r_info) == r_type)
1643 tls_type = GOT_TLS_IE_NEG;
1644 else
1645 /* If this is a GD->IE transition, we may use either of
1646 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1647 tls_type = GOT_TLS_IE;
1648 break;
1649 case R_386_TLS_IE:
1650 case R_386_TLS_GOTIE:
1651 tls_type = GOT_TLS_IE_POS; break;
1652 }
1653
1654 if (h != NULL)
1655 {
1656 h->got.refcount += 1;
1657 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1658 }
1659 else
1660 {
1661 bfd_signed_vma *local_got_refcounts;
1662
1663 /* This is a global offset table entry for a local symbol. */
1664 local_got_refcounts = elf_local_got_refcounts (abfd);
1665 if (local_got_refcounts == NULL)
1666 {
1667 bfd_size_type size;
1668
1669 size = symtab_hdr->sh_info;
1670 size *= (sizeof (bfd_signed_vma)
1671 + sizeof (bfd_vma) + sizeof(char));
1672 local_got_refcounts = (bfd_signed_vma *)
1673 bfd_zalloc (abfd, size);
1674 if (local_got_refcounts == NULL)
1675 return FALSE;
1676 elf_local_got_refcounts (abfd) = local_got_refcounts;
1677 elf_i386_local_tlsdesc_gotent (abfd)
1678 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1679 elf_i386_local_got_tls_type (abfd)
1680 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1681 }
1682 local_got_refcounts[r_symndx] += 1;
1683 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1684 }
1685
1686 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1687 tls_type |= old_tls_type;
1688 /* If a TLS symbol is accessed using IE at least once,
1689 there is no point to use dynamic model for it. */
1690 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1691 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1692 || (tls_type & GOT_TLS_IE) == 0))
1693 {
1694 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1695 tls_type = old_tls_type;
1696 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1697 && GOT_TLS_GD_ANY_P (tls_type))
1698 tls_type |= old_tls_type;
1699 else
1700 {
1701 if (h)
1702 name = h->root.root.string;
1703 else
1704 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1705 NULL);
1706 (*_bfd_error_handler)
1707 (_("%B: `%s' accessed both as normal and "
1708 "thread local symbol"),
1709 abfd, name);
1710 return FALSE;
1711 }
1712 }
1713
1714 if (old_tls_type != tls_type)
1715 {
1716 if (h != NULL)
1717 elf_i386_hash_entry (h)->tls_type = tls_type;
1718 else
1719 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1720 }
1721 }
1722 /* Fall through */
1723
1724 case R_386_GOTOFF:
1725 case R_386_GOTPC:
1726 create_got:
1727 if (htab->elf.sgot == NULL)
1728 {
1729 if (htab->elf.dynobj == NULL)
1730 htab->elf.dynobj = abfd;
1731 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1732 return FALSE;
1733 }
1734 if (r_type != R_386_TLS_IE)
1735 break;
1736 /* Fall through */
1737
1738 case R_386_TLS_LE_32:
1739 case R_386_TLS_LE:
1740 if (info->executable)
1741 break;
1742 info->flags |= DF_STATIC_TLS;
1743 /* Fall through */
1744
1745 case R_386_32:
1746 case R_386_PC32:
1747 if (h != NULL && info->executable)
1748 {
1749 /* If this reloc is in a read-only section, we might
1750 need a copy reloc. We can't check reliably at this
1751 stage whether the section is read-only, as input
1752 sections have not yet been mapped to output sections.
1753 Tentatively set the flag for now, and correct in
1754 adjust_dynamic_symbol. */
1755 h->non_got_ref = 1;
1756
1757 /* We may need a .plt entry if the function this reloc
1758 refers to is in a shared lib. */
1759 h->plt.refcount += 1;
1760 if (r_type != R_386_PC32)
1761 h->pointer_equality_needed = 1;
1762 }
1763
1764 /* If we are creating a shared library, and this is a reloc
1765 against a global symbol, or a non PC relative reloc
1766 against a local symbol, then we need to copy the reloc
1767 into the shared library. However, if we are linking with
1768 -Bsymbolic, we do not need to copy a reloc against a
1769 global symbol which is defined in an object we are
1770 including in the link (i.e., DEF_REGULAR is set). At
1771 this point we have not seen all the input files, so it is
1772 possible that DEF_REGULAR is not set now but will be set
1773 later (it is never cleared). In case of a weak definition,
1774 DEF_REGULAR may be cleared later by a strong definition in
1775 a shared library. We account for that possibility below by
1776 storing information in the relocs_copied field of the hash
1777 table entry. A similar situation occurs when creating
1778 shared libraries and symbol visibility changes render the
1779 symbol local.
1780
1781 If on the other hand, we are creating an executable, we
1782 may need to keep relocations for symbols satisfied by a
1783 dynamic library if we manage to avoid copy relocs for the
1784 symbol. */
1785 if ((info->shared
1786 && (sec->flags & SEC_ALLOC) != 0
1787 && (r_type != R_386_PC32
1788 || (h != NULL
1789 && (! SYMBOLIC_BIND (info, h)
1790 || h->root.type == bfd_link_hash_defweak
1791 || !h->def_regular))))
1792 || (ELIMINATE_COPY_RELOCS
1793 && !info->shared
1794 && (sec->flags & SEC_ALLOC) != 0
1795 && h != NULL
1796 && (h->root.type == bfd_link_hash_defweak
1797 || !h->def_regular)))
1798 {
1799 struct elf_dyn_relocs *p;
1800 struct elf_dyn_relocs **head;
1801
1802 /* We must copy these reloc types into the output file.
1803 Create a reloc section in dynobj and make room for
1804 this reloc. */
1805 if (sreloc == NULL)
1806 {
1807 if (htab->elf.dynobj == NULL)
1808 htab->elf.dynobj = abfd;
1809
1810 sreloc = _bfd_elf_make_dynamic_reloc_section
1811 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1812
1813 if (sreloc == NULL)
1814 return FALSE;
1815 }
1816
1817 /* If this is a global symbol, we count the number of
1818 relocations we need for this symbol. */
1819 if (h != NULL)
1820 {
1821 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1822 }
1823 else
1824 {
1825 /* Track dynamic relocs needed for local syms too.
1826 We really need local syms available to do this
1827 easily. Oh well. */
1828 void **vpp;
1829 asection *s;
1830
1831 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1832 abfd, r_symndx);
1833 if (isym == NULL)
1834 return FALSE;
1835
1836 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1837 if (s == NULL)
1838 s = sec;
1839
1840 vpp = &elf_section_data (s)->local_dynrel;
1841 head = (struct elf_dyn_relocs **)vpp;
1842 }
1843
1844 p = *head;
1845 if (p == NULL || p->sec != sec)
1846 {
1847 bfd_size_type amt = sizeof *p;
1848 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1849 amt);
1850 if (p == NULL)
1851 return FALSE;
1852 p->next = *head;
1853 *head = p;
1854 p->sec = sec;
1855 p->count = 0;
1856 p->pc_count = 0;
1857 }
1858
1859 p->count += 1;
1860 if (r_type == R_386_PC32)
1861 p->pc_count += 1;
1862 }
1863 break;
1864
1865 /* This relocation describes the C++ object vtable hierarchy.
1866 Reconstruct it for later use during GC. */
1867 case R_386_GNU_VTINHERIT:
1868 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1869 return FALSE;
1870 break;
1871
1872 /* This relocation describes which C++ vtable entries are actually
1873 used. Record for later use during GC. */
1874 case R_386_GNU_VTENTRY:
1875 BFD_ASSERT (h != NULL);
1876 if (h != NULL
1877 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1878 return FALSE;
1879 break;
1880
1881 default:
1882 break;
1883 }
1884 }
1885
1886 return TRUE;
1887 }
1888
1889 /* Return the section that should be marked against GC for a given
1890 relocation. */
1891
1892 static asection *
1893 elf_i386_gc_mark_hook (asection *sec,
1894 struct bfd_link_info *info,
1895 Elf_Internal_Rela *rel,
1896 struct elf_link_hash_entry *h,
1897 Elf_Internal_Sym *sym)
1898 {
1899 if (h != NULL)
1900 switch (ELF32_R_TYPE (rel->r_info))
1901 {
1902 case R_386_GNU_VTINHERIT:
1903 case R_386_GNU_VTENTRY:
1904 return NULL;
1905 }
1906
1907 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1908 }
1909
1910 /* Update the got entry reference counts for the section being removed. */
1911
1912 static bfd_boolean
1913 elf_i386_gc_sweep_hook (bfd *abfd,
1914 struct bfd_link_info *info,
1915 asection *sec,
1916 const Elf_Internal_Rela *relocs)
1917 {
1918 struct elf_i386_link_hash_table *htab;
1919 Elf_Internal_Shdr *symtab_hdr;
1920 struct elf_link_hash_entry **sym_hashes;
1921 bfd_signed_vma *local_got_refcounts;
1922 const Elf_Internal_Rela *rel, *relend;
1923
1924 if (info->relocatable)
1925 return TRUE;
1926
1927 htab = elf_i386_hash_table (info);
1928 if (htab == NULL)
1929 return FALSE;
1930
1931 elf_section_data (sec)->local_dynrel = NULL;
1932
1933 symtab_hdr = &elf_symtab_hdr (abfd);
1934 sym_hashes = elf_sym_hashes (abfd);
1935 local_got_refcounts = elf_local_got_refcounts (abfd);
1936
1937 relend = relocs + sec->reloc_count;
1938 for (rel = relocs; rel < relend; rel++)
1939 {
1940 unsigned long r_symndx;
1941 unsigned int r_type;
1942 struct elf_link_hash_entry *h = NULL;
1943
1944 r_symndx = ELF32_R_SYM (rel->r_info);
1945 if (r_symndx >= symtab_hdr->sh_info)
1946 {
1947 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1948 while (h->root.type == bfd_link_hash_indirect
1949 || h->root.type == bfd_link_hash_warning)
1950 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1951 }
1952 else
1953 {
1954 /* A local symbol. */
1955 Elf_Internal_Sym *isym;
1956
1957 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1958 abfd, r_symndx);
1959
1960 /* Check relocation against local STT_GNU_IFUNC symbol. */
1961 if (isym != NULL
1962 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1963 {
1964 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1965 if (h == NULL)
1966 abort ();
1967 }
1968 }
1969
1970 if (h)
1971 {
1972 struct elf_i386_link_hash_entry *eh;
1973 struct elf_dyn_relocs **pp;
1974 struct elf_dyn_relocs *p;
1975
1976 eh = (struct elf_i386_link_hash_entry *) h;
1977 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1978 if (p->sec == sec)
1979 {
1980 /* Everything must go for SEC. */
1981 *pp = p->next;
1982 break;
1983 }
1984 }
1985
1986 r_type = ELF32_R_TYPE (rel->r_info);
1987 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1988 symtab_hdr, sym_hashes,
1989 &r_type, GOT_UNKNOWN,
1990 rel, relend, h, r_symndx))
1991 return FALSE;
1992
1993 switch (r_type)
1994 {
1995 case R_386_TLS_LDM:
1996 if (htab->tls_ldm_got.refcount > 0)
1997 htab->tls_ldm_got.refcount -= 1;
1998 break;
1999
2000 case R_386_TLS_GD:
2001 case R_386_TLS_GOTDESC:
2002 case R_386_TLS_DESC_CALL:
2003 case R_386_TLS_IE_32:
2004 case R_386_TLS_IE:
2005 case R_386_TLS_GOTIE:
2006 case R_386_GOT32:
2007 if (h != NULL)
2008 {
2009 if (h->got.refcount > 0)
2010 h->got.refcount -= 1;
2011 if (h->type == STT_GNU_IFUNC)
2012 {
2013 if (h->plt.refcount > 0)
2014 h->plt.refcount -= 1;
2015 }
2016 }
2017 else if (local_got_refcounts != NULL)
2018 {
2019 if (local_got_refcounts[r_symndx] > 0)
2020 local_got_refcounts[r_symndx] -= 1;
2021 }
2022 break;
2023
2024 case R_386_32:
2025 case R_386_PC32:
2026 if (info->shared
2027 && (h == NULL || h->type != STT_GNU_IFUNC))
2028 break;
2029 /* Fall through */
2030
2031 case R_386_PLT32:
2032 if (h != NULL)
2033 {
2034 if (h->plt.refcount > 0)
2035 h->plt.refcount -= 1;
2036 }
2037 break;
2038
2039 case R_386_GOTOFF:
2040 if (h != NULL && h->type == STT_GNU_IFUNC)
2041 {
2042 if (h->got.refcount > 0)
2043 h->got.refcount -= 1;
2044 if (h->plt.refcount > 0)
2045 h->plt.refcount -= 1;
2046 }
2047 break;
2048
2049 default:
2050 break;
2051 }
2052 }
2053
2054 return TRUE;
2055 }
2056
2057 /* Adjust a symbol defined by a dynamic object and referenced by a
2058 regular object. The current definition is in some section of the
2059 dynamic object, but we're not including those sections. We have to
2060 change the definition to something the rest of the link can
2061 understand. */
2062
2063 static bfd_boolean
2064 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2065 struct elf_link_hash_entry *h)
2066 {
2067 struct elf_i386_link_hash_table *htab;
2068 asection *s;
2069
2070 /* STT_GNU_IFUNC symbol must go through PLT. */
2071 if (h->type == STT_GNU_IFUNC)
2072 {
2073 if (h->plt.refcount <= 0)
2074 {
2075 h->plt.offset = (bfd_vma) -1;
2076 h->needs_plt = 0;
2077 }
2078 return TRUE;
2079 }
2080
2081 /* If this is a function, put it in the procedure linkage table. We
2082 will fill in the contents of the procedure linkage table later,
2083 when we know the address of the .got section. */
2084 if (h->type == STT_FUNC
2085 || h->needs_plt)
2086 {
2087 if (h->plt.refcount <= 0
2088 || SYMBOL_CALLS_LOCAL (info, h)
2089 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2090 && h->root.type == bfd_link_hash_undefweak))
2091 {
2092 /* This case can occur if we saw a PLT32 reloc in an input
2093 file, but the symbol was never referred to by a dynamic
2094 object, or if all references were garbage collected. In
2095 such a case, we don't actually need to build a procedure
2096 linkage table, and we can just do a PC32 reloc instead. */
2097 h->plt.offset = (bfd_vma) -1;
2098 h->needs_plt = 0;
2099 }
2100
2101 return TRUE;
2102 }
2103 else
2104 /* It's possible that we incorrectly decided a .plt reloc was
2105 needed for an R_386_PC32 reloc to a non-function sym in
2106 check_relocs. We can't decide accurately between function and
2107 non-function syms in check-relocs; Objects loaded later in
2108 the link may change h->type. So fix it now. */
2109 h->plt.offset = (bfd_vma) -1;
2110
2111 /* If this is a weak symbol, and there is a real definition, the
2112 processor independent code will have arranged for us to see the
2113 real definition first, and we can just use the same value. */
2114 if (h->u.weakdef != NULL)
2115 {
2116 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2117 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2118 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2119 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2120 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2121 h->non_got_ref = h->u.weakdef->non_got_ref;
2122 return TRUE;
2123 }
2124
2125 /* This is a reference to a symbol defined by a dynamic object which
2126 is not a function. */
2127
2128 /* If we are creating a shared library, we must presume that the
2129 only references to the symbol are via the global offset table.
2130 For such cases we need not do anything here; the relocations will
2131 be handled correctly by relocate_section. */
2132 if (info->shared)
2133 return TRUE;
2134
2135 /* If there are no references to this symbol that do not use the
2136 GOT, we don't need to generate a copy reloc. */
2137 if (!h->non_got_ref)
2138 return TRUE;
2139
2140 /* If -z nocopyreloc was given, we won't generate them either. */
2141 if (info->nocopyreloc)
2142 {
2143 h->non_got_ref = 0;
2144 return TRUE;
2145 }
2146
2147 htab = elf_i386_hash_table (info);
2148 if (htab == NULL)
2149 return FALSE;
2150
2151 /* If there aren't any dynamic relocs in read-only sections, then
2152 we can keep the dynamic relocs and avoid the copy reloc. This
2153 doesn't work on VxWorks, where we can not have dynamic relocations
2154 (other than copy and jump slot relocations) in an executable. */
2155 if (ELIMINATE_COPY_RELOCS
2156 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2157 {
2158 struct elf_i386_link_hash_entry * eh;
2159 struct elf_dyn_relocs *p;
2160
2161 eh = (struct elf_i386_link_hash_entry *) h;
2162 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2163 {
2164 s = p->sec->output_section;
2165 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2166 break;
2167 }
2168
2169 if (p == NULL)
2170 {
2171 h->non_got_ref = 0;
2172 return TRUE;
2173 }
2174 }
2175
2176 /* We must allocate the symbol in our .dynbss section, which will
2177 become part of the .bss section of the executable. There will be
2178 an entry for this symbol in the .dynsym section. The dynamic
2179 object will contain position independent code, so all references
2180 from the dynamic object to this symbol will go through the global
2181 offset table. The dynamic linker will use the .dynsym entry to
2182 determine the address it must put in the global offset table, so
2183 both the dynamic object and the regular object will refer to the
2184 same memory location for the variable. */
2185
2186 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2187 copy the initial value out of the dynamic object and into the
2188 runtime process image. */
2189 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2190 {
2191 htab->srelbss->size += sizeof (Elf32_External_Rel);
2192 h->needs_copy = 1;
2193 }
2194
2195 s = htab->sdynbss;
2196
2197 return _bfd_elf_adjust_dynamic_copy (h, s);
2198 }
2199
2200 /* Allocate space in .plt, .got and associated reloc sections for
2201 dynamic relocs. */
2202
2203 static bfd_boolean
2204 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2205 {
2206 struct bfd_link_info *info;
2207 struct elf_i386_link_hash_table *htab;
2208 struct elf_i386_link_hash_entry *eh;
2209 struct elf_dyn_relocs *p;
2210 unsigned plt_entry_size;
2211
2212 if (h->root.type == bfd_link_hash_indirect)
2213 return TRUE;
2214
2215 eh = (struct elf_i386_link_hash_entry *) h;
2216
2217 info = (struct bfd_link_info *) inf;
2218 htab = elf_i386_hash_table (info);
2219 if (htab == NULL)
2220 return FALSE;
2221
2222 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2223
2224 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2225 here if it is defined and referenced in a non-shared object. */
2226 if (h->type == STT_GNU_IFUNC
2227 && h->def_regular)
2228 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2229 plt_entry_size, 4);
2230 else if (htab->elf.dynamic_sections_created
2231 && h->plt.refcount > 0)
2232 {
2233 /* Make sure this symbol is output as a dynamic symbol.
2234 Undefined weak syms won't yet be marked as dynamic. */
2235 if (h->dynindx == -1
2236 && !h->forced_local)
2237 {
2238 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2239 return FALSE;
2240 }
2241
2242 if (info->shared
2243 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2244 {
2245 asection *s = htab->elf.splt;
2246
2247 /* If this is the first .plt entry, make room for the special
2248 first entry. */
2249 if (s->size == 0)
2250 s->size += plt_entry_size;
2251
2252 h->plt.offset = s->size;
2253
2254 /* If this symbol is not defined in a regular file, and we are
2255 not generating a shared library, then set the symbol to this
2256 location in the .plt. This is required to make function
2257 pointers compare as equal between the normal executable and
2258 the shared library. */
2259 if (! info->shared
2260 && !h->def_regular)
2261 {
2262 h->root.u.def.section = s;
2263 h->root.u.def.value = h->plt.offset;
2264 }
2265
2266 /* Make room for this entry. */
2267 s->size += plt_entry_size;
2268
2269 /* We also need to make an entry in the .got.plt section, which
2270 will be placed in the .got section by the linker script. */
2271 htab->elf.sgotplt->size += 4;
2272
2273 /* We also need to make an entry in the .rel.plt section. */
2274 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2275 htab->elf.srelplt->reloc_count++;
2276
2277 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2278 && !info->shared)
2279 {
2280 /* VxWorks has a second set of relocations for each PLT entry
2281 in executables. They go in a separate relocation section,
2282 which is processed by the kernel loader. */
2283
2284 /* There are two relocations for the initial PLT entry: an
2285 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2286 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2287
2288 if (h->plt.offset == plt_entry_size)
2289 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2290
2291 /* There are two extra relocations for each subsequent PLT entry:
2292 an R_386_32 relocation for the GOT entry, and an R_386_32
2293 relocation for the PLT entry. */
2294
2295 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2296 }
2297 }
2298 else
2299 {
2300 h->plt.offset = (bfd_vma) -1;
2301 h->needs_plt = 0;
2302 }
2303 }
2304 else
2305 {
2306 h->plt.offset = (bfd_vma) -1;
2307 h->needs_plt = 0;
2308 }
2309
2310 eh->tlsdesc_got = (bfd_vma) -1;
2311
2312 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2313 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2314 if (h->got.refcount > 0
2315 && info->executable
2316 && h->dynindx == -1
2317 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2318 h->got.offset = (bfd_vma) -1;
2319 else if (h->got.refcount > 0)
2320 {
2321 asection *s;
2322 bfd_boolean dyn;
2323 int tls_type = elf_i386_hash_entry(h)->tls_type;
2324
2325 /* Make sure this symbol is output as a dynamic symbol.
2326 Undefined weak syms won't yet be marked as dynamic. */
2327 if (h->dynindx == -1
2328 && !h->forced_local)
2329 {
2330 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2331 return FALSE;
2332 }
2333
2334 s = htab->elf.sgot;
2335 if (GOT_TLS_GDESC_P (tls_type))
2336 {
2337 eh->tlsdesc_got = htab->elf.sgotplt->size
2338 - elf_i386_compute_jump_table_size (htab);
2339 htab->elf.sgotplt->size += 8;
2340 h->got.offset = (bfd_vma) -2;
2341 }
2342 if (! GOT_TLS_GDESC_P (tls_type)
2343 || GOT_TLS_GD_P (tls_type))
2344 {
2345 h->got.offset = s->size;
2346 s->size += 4;
2347 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2348 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2349 s->size += 4;
2350 }
2351 dyn = htab->elf.dynamic_sections_created;
2352 /* R_386_TLS_IE_32 needs one dynamic relocation,
2353 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2354 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2355 need two), R_386_TLS_GD needs one if local symbol and two if
2356 global. */
2357 if (tls_type == GOT_TLS_IE_BOTH)
2358 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2359 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2360 || (tls_type & GOT_TLS_IE))
2361 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2362 else if (GOT_TLS_GD_P (tls_type))
2363 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2364 else if (! GOT_TLS_GDESC_P (tls_type)
2365 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2366 || h->root.type != bfd_link_hash_undefweak)
2367 && (info->shared
2368 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2369 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2370 if (GOT_TLS_GDESC_P (tls_type))
2371 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2372 }
2373 else
2374 h->got.offset = (bfd_vma) -1;
2375
2376 if (eh->dyn_relocs == NULL)
2377 return TRUE;
2378
2379 /* In the shared -Bsymbolic case, discard space allocated for
2380 dynamic pc-relative relocs against symbols which turn out to be
2381 defined in regular objects. For the normal shared case, discard
2382 space for pc-relative relocs that have become local due to symbol
2383 visibility changes. */
2384
2385 if (info->shared)
2386 {
2387 /* The only reloc that uses pc_count is R_386_PC32, which will
2388 appear on a call or on something like ".long foo - .". We
2389 want calls to protected symbols to resolve directly to the
2390 function rather than going via the plt. If people want
2391 function pointer comparisons to work as expected then they
2392 should avoid writing assembly like ".long foo - .". */
2393 if (SYMBOL_CALLS_LOCAL (info, h))
2394 {
2395 struct elf_dyn_relocs **pp;
2396
2397 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2398 {
2399 p->count -= p->pc_count;
2400 p->pc_count = 0;
2401 if (p->count == 0)
2402 *pp = p->next;
2403 else
2404 pp = &p->next;
2405 }
2406 }
2407
2408 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2409 {
2410 struct elf_dyn_relocs **pp;
2411 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2412 {
2413 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2414 *pp = p->next;
2415 else
2416 pp = &p->next;
2417 }
2418 }
2419
2420 /* Also discard relocs on undefined weak syms with non-default
2421 visibility. */
2422 if (eh->dyn_relocs != NULL
2423 && h->root.type == bfd_link_hash_undefweak)
2424 {
2425 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2426 eh->dyn_relocs = NULL;
2427
2428 /* Make sure undefined weak symbols are output as a dynamic
2429 symbol in PIEs. */
2430 else if (h->dynindx == -1
2431 && !h->forced_local)
2432 {
2433 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2434 return FALSE;
2435 }
2436 }
2437 }
2438 else if (ELIMINATE_COPY_RELOCS)
2439 {
2440 /* For the non-shared case, discard space for relocs against
2441 symbols which turn out to need copy relocs or are not
2442 dynamic. */
2443
2444 if (!h->non_got_ref
2445 && ((h->def_dynamic
2446 && !h->def_regular)
2447 || (htab->elf.dynamic_sections_created
2448 && (h->root.type == bfd_link_hash_undefweak
2449 || h->root.type == bfd_link_hash_undefined))))
2450 {
2451 /* Make sure this symbol is output as a dynamic symbol.
2452 Undefined weak syms won't yet be marked as dynamic. */
2453 if (h->dynindx == -1
2454 && !h->forced_local)
2455 {
2456 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2457 return FALSE;
2458 }
2459
2460 /* If that succeeded, we know we'll be keeping all the
2461 relocs. */
2462 if (h->dynindx != -1)
2463 goto keep;
2464 }
2465
2466 eh->dyn_relocs = NULL;
2467
2468 keep: ;
2469 }
2470
2471 /* Finally, allocate space. */
2472 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2473 {
2474 asection *sreloc;
2475
2476 sreloc = elf_section_data (p->sec)->sreloc;
2477
2478 BFD_ASSERT (sreloc != NULL);
2479 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2480 }
2481
2482 return TRUE;
2483 }
2484
2485 /* Allocate space in .plt, .got and associated reloc sections for
2486 local dynamic relocs. */
2487
2488 static bfd_boolean
2489 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2490 {
2491 struct elf_link_hash_entry *h
2492 = (struct elf_link_hash_entry *) *slot;
2493
2494 if (h->type != STT_GNU_IFUNC
2495 || !h->def_regular
2496 || !h->ref_regular
2497 || !h->forced_local
2498 || h->root.type != bfd_link_hash_defined)
2499 abort ();
2500
2501 return elf_i386_allocate_dynrelocs (h, inf);
2502 }
2503
2504 /* Find any dynamic relocs that apply to read-only sections. */
2505
2506 static bfd_boolean
2507 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2508 {
2509 struct elf_i386_link_hash_entry *eh;
2510 struct elf_dyn_relocs *p;
2511
2512 /* Skip local IFUNC symbols. */
2513 if (h->forced_local && h->type == STT_GNU_IFUNC)
2514 return TRUE;
2515
2516 eh = (struct elf_i386_link_hash_entry *) h;
2517 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2518 {
2519 asection *s = p->sec->output_section;
2520
2521 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2522 {
2523 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2524
2525 info->flags |= DF_TEXTREL;
2526
2527 if (info->warn_shared_textrel && info->shared)
2528 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2529 p->sec->owner, h->root.root.string,
2530 p->sec);
2531
2532 /* Not an error, just cut short the traversal. */
2533 return FALSE;
2534 }
2535 }
2536 return TRUE;
2537 }
2538
2539 /* Convert
2540 mov foo@GOT(%reg), %reg
2541 to
2542 lea foo@GOTOFF(%reg), %reg
2543 with the local symbol, foo. */
2544
2545 static bfd_boolean
2546 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2547 struct bfd_link_info *link_info)
2548 {
2549 Elf_Internal_Shdr *symtab_hdr;
2550 Elf_Internal_Rela *internal_relocs;
2551 Elf_Internal_Rela *irel, *irelend;
2552 bfd_byte *contents;
2553 struct elf_i386_link_hash_table *htab;
2554 bfd_boolean changed_contents;
2555 bfd_boolean changed_relocs;
2556 bfd_signed_vma *local_got_refcounts;
2557
2558 /* Don't even try to convert non-ELF outputs. */
2559 if (!is_elf_hash_table (link_info->hash))
2560 return FALSE;
2561
2562 /* Nothing to do if there are no codes or no relocations. */
2563 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2564 || sec->reloc_count == 0)
2565 return TRUE;
2566
2567 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2568
2569 /* Load the relocations for this section. */
2570 internal_relocs = (_bfd_elf_link_read_relocs
2571 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2572 link_info->keep_memory));
2573 if (internal_relocs == NULL)
2574 return FALSE;
2575
2576 htab = elf_i386_hash_table (link_info);
2577 changed_contents = FALSE;
2578 changed_relocs = FALSE;
2579 local_got_refcounts = elf_local_got_refcounts (abfd);
2580
2581 /* Get the section contents. */
2582 if (elf_section_data (sec)->this_hdr.contents != NULL)
2583 contents = elf_section_data (sec)->this_hdr.contents;
2584 else
2585 {
2586 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2587 goto error_return;
2588 }
2589
2590 irelend = internal_relocs + sec->reloc_count;
2591 for (irel = internal_relocs; irel < irelend; irel++)
2592 {
2593 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2594 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2595 unsigned int indx;
2596 struct elf_link_hash_entry *h;
2597
2598 if (r_type != R_386_GOT32)
2599 continue;
2600
2601 /* Get the symbol referred to by the reloc. */
2602 if (r_symndx < symtab_hdr->sh_info)
2603 {
2604 Elf_Internal_Sym *isym;
2605
2606 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2607 abfd, r_symndx);
2608
2609 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2610 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2611 && bfd_get_8 (input_bfd,
2612 contents + irel->r_offset - 2) == 0x8b)
2613 {
2614 bfd_put_8 (output_bfd, 0x8d,
2615 contents + irel->r_offset - 2);
2616 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2617 if (local_got_refcounts != NULL
2618 && local_got_refcounts[r_symndx] > 0)
2619 local_got_refcounts[r_symndx] -= 1;
2620 changed_contents = TRUE;
2621 changed_relocs = TRUE;
2622 }
2623 continue;
2624 }
2625
2626 indx = r_symndx - symtab_hdr->sh_info;
2627 h = elf_sym_hashes (abfd)[indx];
2628 BFD_ASSERT (h != NULL);
2629
2630 while (h->root.type == bfd_link_hash_indirect
2631 || h->root.type == bfd_link_hash_warning)
2632 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2633
2634 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2635 optimizing _DYNAMIC since ld.so may use its link-time address. */
2636 if (h->def_regular
2637 && h->type != STT_GNU_IFUNC
2638 && h != htab->elf.hdynamic
2639 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2640 && bfd_get_8 (input_bfd,
2641 contents + irel->r_offset - 2) == 0x8b)
2642 {
2643 bfd_put_8 (output_bfd, 0x8d,
2644 contents + irel->r_offset - 2);
2645 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2646 if (h->got.refcount > 0)
2647 h->got.refcount -= 1;
2648 changed_contents = TRUE;
2649 changed_relocs = TRUE;
2650 }
2651 }
2652
2653 if (contents != NULL
2654 && elf_section_data (sec)->this_hdr.contents != contents)
2655 {
2656 if (!changed_contents && !link_info->keep_memory)
2657 free (contents);
2658 else
2659 {
2660 /* Cache the section contents for elf_link_input_bfd. */
2661 elf_section_data (sec)->this_hdr.contents = contents;
2662 }
2663 }
2664
2665 if (elf_section_data (sec)->relocs != internal_relocs)
2666 {
2667 if (!changed_relocs)
2668 free (internal_relocs);
2669 else
2670 elf_section_data (sec)->relocs = internal_relocs;
2671 }
2672
2673 return TRUE;
2674
2675 error_return:
2676 if (contents != NULL
2677 && elf_section_data (sec)->this_hdr.contents != contents)
2678 free (contents);
2679 if (internal_relocs != NULL
2680 && elf_section_data (sec)->relocs != internal_relocs)
2681 free (internal_relocs);
2682 return FALSE;
2683 }
2684
2685 /* Set the sizes of the dynamic sections. */
2686
2687 static bfd_boolean
2688 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2689 {
2690 struct elf_i386_link_hash_table *htab;
2691 bfd *dynobj;
2692 asection *s;
2693 bfd_boolean relocs;
2694 bfd *ibfd;
2695
2696 htab = elf_i386_hash_table (info);
2697 if (htab == NULL)
2698 return FALSE;
2699 dynobj = htab->elf.dynobj;
2700 if (dynobj == NULL)
2701 abort ();
2702
2703 if (htab->elf.dynamic_sections_created)
2704 {
2705 /* Set the contents of the .interp section to the interpreter. */
2706 if (info->executable)
2707 {
2708 s = bfd_get_linker_section (dynobj, ".interp");
2709 if (s == NULL)
2710 abort ();
2711 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2712 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2713 }
2714 }
2715
2716 /* Set up .got offsets for local syms, and space for local dynamic
2717 relocs. */
2718 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2719 {
2720 bfd_signed_vma *local_got;
2721 bfd_signed_vma *end_local_got;
2722 char *local_tls_type;
2723 bfd_vma *local_tlsdesc_gotent;
2724 bfd_size_type locsymcount;
2725 Elf_Internal_Shdr *symtab_hdr;
2726 asection *srel;
2727
2728 if (! is_i386_elf (ibfd))
2729 continue;
2730
2731 for (s = ibfd->sections; s != NULL; s = s->next)
2732 {
2733 struct elf_dyn_relocs *p;
2734
2735 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2736 return FALSE;
2737
2738 for (p = ((struct elf_dyn_relocs *)
2739 elf_section_data (s)->local_dynrel);
2740 p != NULL;
2741 p = p->next)
2742 {
2743 if (!bfd_is_abs_section (p->sec)
2744 && bfd_is_abs_section (p->sec->output_section))
2745 {
2746 /* Input section has been discarded, either because
2747 it is a copy of a linkonce section or due to
2748 linker script /DISCARD/, so we'll be discarding
2749 the relocs too. */
2750 }
2751 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2752 && strcmp (p->sec->output_section->name,
2753 ".tls_vars") == 0)
2754 {
2755 /* Relocations in vxworks .tls_vars sections are
2756 handled specially by the loader. */
2757 }
2758 else if (p->count != 0)
2759 {
2760 srel = elf_section_data (p->sec)->sreloc;
2761 srel->size += p->count * sizeof (Elf32_External_Rel);
2762 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2763 && (info->flags & DF_TEXTREL) == 0)
2764 {
2765 info->flags |= DF_TEXTREL;
2766 if (info->warn_shared_textrel && info->shared)
2767 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2768 p->sec->owner, p->sec);
2769 }
2770 }
2771 }
2772 }
2773
2774 local_got = elf_local_got_refcounts (ibfd);
2775 if (!local_got)
2776 continue;
2777
2778 symtab_hdr = &elf_symtab_hdr (ibfd);
2779 locsymcount = symtab_hdr->sh_info;
2780 end_local_got = local_got + locsymcount;
2781 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2782 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2783 s = htab->elf.sgot;
2784 srel = htab->elf.srelgot;
2785 for (; local_got < end_local_got;
2786 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2787 {
2788 *local_tlsdesc_gotent = (bfd_vma) -1;
2789 if (*local_got > 0)
2790 {
2791 if (GOT_TLS_GDESC_P (*local_tls_type))
2792 {
2793 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2794 - elf_i386_compute_jump_table_size (htab);
2795 htab->elf.sgotplt->size += 8;
2796 *local_got = (bfd_vma) -2;
2797 }
2798 if (! GOT_TLS_GDESC_P (*local_tls_type)
2799 || GOT_TLS_GD_P (*local_tls_type))
2800 {
2801 *local_got = s->size;
2802 s->size += 4;
2803 if (GOT_TLS_GD_P (*local_tls_type)
2804 || *local_tls_type == GOT_TLS_IE_BOTH)
2805 s->size += 4;
2806 }
2807 if (info->shared
2808 || GOT_TLS_GD_ANY_P (*local_tls_type)
2809 || (*local_tls_type & GOT_TLS_IE))
2810 {
2811 if (*local_tls_type == GOT_TLS_IE_BOTH)
2812 srel->size += 2 * sizeof (Elf32_External_Rel);
2813 else if (GOT_TLS_GD_P (*local_tls_type)
2814 || ! GOT_TLS_GDESC_P (*local_tls_type))
2815 srel->size += sizeof (Elf32_External_Rel);
2816 if (GOT_TLS_GDESC_P (*local_tls_type))
2817 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2818 }
2819 }
2820 else
2821 *local_got = (bfd_vma) -1;
2822 }
2823 }
2824
2825 if (htab->tls_ldm_got.refcount > 0)
2826 {
2827 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2828 relocs. */
2829 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2830 htab->elf.sgot->size += 8;
2831 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2832 }
2833 else
2834 htab->tls_ldm_got.offset = -1;
2835
2836 /* Allocate global sym .plt and .got entries, and space for global
2837 sym dynamic relocs. */
2838 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2839
2840 /* Allocate .plt and .got entries, and space for local symbols. */
2841 htab_traverse (htab->loc_hash_table,
2842 elf_i386_allocate_local_dynrelocs,
2843 info);
2844
2845 /* For every jump slot reserved in the sgotplt, reloc_count is
2846 incremented. However, when we reserve space for TLS descriptors,
2847 it's not incremented, so in order to compute the space reserved
2848 for them, it suffices to multiply the reloc count by the jump
2849 slot size.
2850
2851 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2852 so that R_386_IRELATIVE entries come last. */
2853 if (htab->elf.srelplt)
2854 {
2855 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2856 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2857 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2858 }
2859 else if (htab->elf.irelplt)
2860 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2861
2862
2863 if (htab->elf.sgotplt)
2864 {
2865 struct elf_link_hash_entry *got;
2866 got = elf_link_hash_lookup (elf_hash_table (info),
2867 "_GLOBAL_OFFSET_TABLE_",
2868 FALSE, FALSE, FALSE);
2869
2870 /* Don't allocate .got.plt section if there are no GOT nor PLT
2871 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2872 if ((got == NULL
2873 || !got->ref_regular_nonweak)
2874 && (htab->elf.sgotplt->size
2875 == get_elf_backend_data (output_bfd)->got_header_size)
2876 && (htab->elf.splt == NULL
2877 || htab->elf.splt->size == 0)
2878 && (htab->elf.sgot == NULL
2879 || htab->elf.sgot->size == 0)
2880 && (htab->elf.iplt == NULL
2881 || htab->elf.iplt->size == 0)
2882 && (htab->elf.igotplt == NULL
2883 || htab->elf.igotplt->size == 0))
2884 htab->elf.sgotplt->size = 0;
2885 }
2886
2887
2888 if (htab->plt_eh_frame != NULL
2889 && htab->elf.splt != NULL
2890 && htab->elf.splt->size != 0
2891 && !bfd_is_abs_section (htab->elf.splt->output_section)
2892 && _bfd_elf_eh_frame_present (info))
2893 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2894
2895 /* We now have determined the sizes of the various dynamic sections.
2896 Allocate memory for them. */
2897 relocs = FALSE;
2898 for (s = dynobj->sections; s != NULL; s = s->next)
2899 {
2900 bfd_boolean strip_section = TRUE;
2901
2902 if ((s->flags & SEC_LINKER_CREATED) == 0)
2903 continue;
2904
2905 if (s == htab->elf.splt
2906 || s == htab->elf.sgot)
2907 {
2908 /* Strip this section if we don't need it; see the
2909 comment below. */
2910 /* We'd like to strip these sections if they aren't needed, but if
2911 we've exported dynamic symbols from them we must leave them.
2912 It's too late to tell BFD to get rid of the symbols. */
2913
2914 if (htab->elf.hplt != NULL)
2915 strip_section = FALSE;
2916 }
2917 else if (s == htab->elf.sgotplt
2918 || s == htab->elf.iplt
2919 || s == htab->elf.igotplt
2920 || s == htab->plt_eh_frame
2921 || s == htab->sdynbss)
2922 {
2923 /* Strip these too. */
2924 }
2925 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2926 {
2927 if (s->size != 0
2928 && s != htab->elf.srelplt
2929 && s != htab->srelplt2)
2930 relocs = TRUE;
2931
2932 /* We use the reloc_count field as a counter if we need
2933 to copy relocs into the output file. */
2934 s->reloc_count = 0;
2935 }
2936 else
2937 {
2938 /* It's not one of our sections, so don't allocate space. */
2939 continue;
2940 }
2941
2942 if (s->size == 0)
2943 {
2944 /* If we don't need this section, strip it from the
2945 output file. This is mostly to handle .rel.bss and
2946 .rel.plt. We must create both sections in
2947 create_dynamic_sections, because they must be created
2948 before the linker maps input sections to output
2949 sections. The linker does that before
2950 adjust_dynamic_symbol is called, and it is that
2951 function which decides whether anything needs to go
2952 into these sections. */
2953 if (strip_section)
2954 s->flags |= SEC_EXCLUDE;
2955 continue;
2956 }
2957
2958 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2959 continue;
2960
2961 /* Allocate memory for the section contents. We use bfd_zalloc
2962 here in case unused entries are not reclaimed before the
2963 section's contents are written out. This should not happen,
2964 but this way if it does, we get a R_386_NONE reloc instead
2965 of garbage. */
2966 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2967 if (s->contents == NULL)
2968 return FALSE;
2969 }
2970
2971 if (htab->plt_eh_frame != NULL
2972 && htab->plt_eh_frame->contents != NULL)
2973 {
2974 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2975 sizeof (elf_i386_eh_frame_plt));
2976 bfd_put_32 (dynobj, htab->elf.splt->size,
2977 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2978 }
2979
2980 if (htab->elf.dynamic_sections_created)
2981 {
2982 /* Add some entries to the .dynamic section. We fill in the
2983 values later, in elf_i386_finish_dynamic_sections, but we
2984 must add the entries now so that we get the correct size for
2985 the .dynamic section. The DT_DEBUG entry is filled in by the
2986 dynamic linker and used by the debugger. */
2987 #define add_dynamic_entry(TAG, VAL) \
2988 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2989
2990 if (info->executable)
2991 {
2992 if (!add_dynamic_entry (DT_DEBUG, 0))
2993 return FALSE;
2994 }
2995
2996 if (htab->elf.splt->size != 0)
2997 {
2998 if (!add_dynamic_entry (DT_PLTGOT, 0)
2999 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3000 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3001 || !add_dynamic_entry (DT_JMPREL, 0))
3002 return FALSE;
3003 }
3004
3005 if (relocs)
3006 {
3007 if (!add_dynamic_entry (DT_REL, 0)
3008 || !add_dynamic_entry (DT_RELSZ, 0)
3009 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3010 return FALSE;
3011
3012 /* If any dynamic relocs apply to a read-only section,
3013 then we need a DT_TEXTREL entry. */
3014 if ((info->flags & DF_TEXTREL) == 0)
3015 elf_link_hash_traverse (&htab->elf,
3016 elf_i386_readonly_dynrelocs, info);
3017
3018 if ((info->flags & DF_TEXTREL) != 0)
3019 {
3020 if (!add_dynamic_entry (DT_TEXTREL, 0))
3021 return FALSE;
3022 }
3023 }
3024 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3025 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3026 return FALSE;
3027 }
3028 #undef add_dynamic_entry
3029
3030 return TRUE;
3031 }
3032
3033 static bfd_boolean
3034 elf_i386_always_size_sections (bfd *output_bfd,
3035 struct bfd_link_info *info)
3036 {
3037 asection *tls_sec = elf_hash_table (info)->tls_sec;
3038
3039 if (tls_sec)
3040 {
3041 struct elf_link_hash_entry *tlsbase;
3042
3043 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3044 "_TLS_MODULE_BASE_",
3045 FALSE, FALSE, FALSE);
3046
3047 if (tlsbase && tlsbase->type == STT_TLS)
3048 {
3049 struct elf_i386_link_hash_table *htab;
3050 struct bfd_link_hash_entry *bh = NULL;
3051 const struct elf_backend_data *bed
3052 = get_elf_backend_data (output_bfd);
3053
3054 htab = elf_i386_hash_table (info);
3055 if (htab == NULL)
3056 return FALSE;
3057
3058 if (!(_bfd_generic_link_add_one_symbol
3059 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3060 tls_sec, 0, NULL, FALSE,
3061 bed->collect, &bh)))
3062 return FALSE;
3063
3064 htab->tls_module_base = bh;
3065
3066 tlsbase = (struct elf_link_hash_entry *)bh;
3067 tlsbase->def_regular = 1;
3068 tlsbase->other = STV_HIDDEN;
3069 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3070 }
3071 }
3072
3073 return TRUE;
3074 }
3075
3076 /* Set the correct type for an x86 ELF section. We do this by the
3077 section name, which is a hack, but ought to work. */
3078
3079 static bfd_boolean
3080 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3081 Elf_Internal_Shdr *hdr,
3082 asection *sec)
3083 {
3084 const char *name;
3085
3086 name = bfd_get_section_name (abfd, sec);
3087
3088 /* This is an ugly, but unfortunately necessary hack that is
3089 needed when producing EFI binaries on x86. It tells
3090 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3091 containing ELF relocation info. We need this hack in order to
3092 be able to generate ELF binaries that can be translated into
3093 EFI applications (which are essentially COFF objects). Those
3094 files contain a COFF ".reloc" section inside an ELFNN object,
3095 which would normally cause BFD to segfault because it would
3096 attempt to interpret this section as containing relocation
3097 entries for section "oc". With this hack enabled, ".reloc"
3098 will be treated as a normal data section, which will avoid the
3099 segfault. However, you won't be able to create an ELFNN binary
3100 with a section named "oc" that needs relocations, but that's
3101 the kind of ugly side-effects you get when detecting section
3102 types based on their names... In practice, this limitation is
3103 unlikely to bite. */
3104 if (strcmp (name, ".reloc") == 0)
3105 hdr->sh_type = SHT_PROGBITS;
3106
3107 return TRUE;
3108 }
3109
3110 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3111 executables. Rather than setting it to the beginning of the TLS
3112 section, we have to set it to the end. This function may be called
3113 multiple times, it is idempotent. */
3114
3115 static void
3116 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3117 {
3118 struct elf_i386_link_hash_table *htab;
3119 struct bfd_link_hash_entry *base;
3120
3121 if (!info->executable)
3122 return;
3123
3124 htab = elf_i386_hash_table (info);
3125 if (htab == NULL)
3126 return;
3127
3128 base = htab->tls_module_base;
3129 if (base == NULL)
3130 return;
3131
3132 base->u.def.value = htab->elf.tls_size;
3133 }
3134
3135 /* Return the base VMA address which should be subtracted from real addresses
3136 when resolving @dtpoff relocation.
3137 This is PT_TLS segment p_vaddr. */
3138
3139 static bfd_vma
3140 elf_i386_dtpoff_base (struct bfd_link_info *info)
3141 {
3142 /* If tls_sec is NULL, we should have signalled an error already. */
3143 if (elf_hash_table (info)->tls_sec == NULL)
3144 return 0;
3145 return elf_hash_table (info)->tls_sec->vma;
3146 }
3147
3148 /* Return the relocation value for @tpoff relocation
3149 if STT_TLS virtual address is ADDRESS. */
3150
3151 static bfd_vma
3152 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3153 {
3154 struct elf_link_hash_table *htab = elf_hash_table (info);
3155 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3156 bfd_vma static_tls_size;
3157
3158 /* If tls_sec is NULL, we should have signalled an error already. */
3159 if (htab->tls_sec == NULL)
3160 return 0;
3161
3162 /* Consider special static TLS alignment requirements. */
3163 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3164 return static_tls_size + htab->tls_sec->vma - address;
3165 }
3166
3167 /* Relocate an i386 ELF section. */
3168
3169 static bfd_boolean
3170 elf_i386_relocate_section (bfd *output_bfd,
3171 struct bfd_link_info *info,
3172 bfd *input_bfd,
3173 asection *input_section,
3174 bfd_byte *contents,
3175 Elf_Internal_Rela *relocs,
3176 Elf_Internal_Sym *local_syms,
3177 asection **local_sections)
3178 {
3179 struct elf_i386_link_hash_table *htab;
3180 Elf_Internal_Shdr *symtab_hdr;
3181 struct elf_link_hash_entry **sym_hashes;
3182 bfd_vma *local_got_offsets;
3183 bfd_vma *local_tlsdesc_gotents;
3184 Elf_Internal_Rela *rel;
3185 Elf_Internal_Rela *relend;
3186 bfd_boolean is_vxworks_tls;
3187 unsigned plt_entry_size;
3188
3189 BFD_ASSERT (is_i386_elf (input_bfd));
3190
3191 htab = elf_i386_hash_table (info);
3192 if (htab == NULL)
3193 return FALSE;
3194 symtab_hdr = &elf_symtab_hdr (input_bfd);
3195 sym_hashes = elf_sym_hashes (input_bfd);
3196 local_got_offsets = elf_local_got_offsets (input_bfd);
3197 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3198 /* We have to handle relocations in vxworks .tls_vars sections
3199 specially, because the dynamic loader is 'weird'. */
3200 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3201 && info->shared
3202 && !strcmp (input_section->output_section->name,
3203 ".tls_vars"));
3204
3205 elf_i386_set_tls_module_base (info);
3206
3207 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3208
3209 rel = relocs;
3210 relend = relocs + input_section->reloc_count;
3211 for (; rel < relend; rel++)
3212 {
3213 unsigned int r_type;
3214 reloc_howto_type *howto;
3215 unsigned long r_symndx;
3216 struct elf_link_hash_entry *h;
3217 Elf_Internal_Sym *sym;
3218 asection *sec;
3219 bfd_vma off, offplt;
3220 bfd_vma relocation;
3221 bfd_boolean unresolved_reloc;
3222 bfd_reloc_status_type r;
3223 unsigned int indx;
3224 int tls_type;
3225
3226 r_type = ELF32_R_TYPE (rel->r_info);
3227 if (r_type == R_386_GNU_VTINHERIT
3228 || r_type == R_386_GNU_VTENTRY)
3229 continue;
3230
3231 if ((indx = r_type) >= R_386_standard
3232 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3233 >= R_386_ext - R_386_standard)
3234 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3235 >= R_386_irelative - R_386_ext))
3236 {
3237 (*_bfd_error_handler)
3238 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3239 input_bfd, input_section, r_type);
3240 bfd_set_error (bfd_error_bad_value);
3241 return FALSE;
3242 }
3243 howto = elf_howto_table + indx;
3244
3245 r_symndx = ELF32_R_SYM (rel->r_info);
3246 h = NULL;
3247 sym = NULL;
3248 sec = NULL;
3249 unresolved_reloc = FALSE;
3250 if (r_symndx < symtab_hdr->sh_info)
3251 {
3252 sym = local_syms + r_symndx;
3253 sec = local_sections[r_symndx];
3254 relocation = (sec->output_section->vma
3255 + sec->output_offset
3256 + sym->st_value);
3257
3258 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3259 && ((sec->flags & SEC_MERGE) != 0
3260 || (info->relocatable
3261 && sec->output_offset != 0)))
3262 {
3263 bfd_vma addend;
3264 bfd_byte *where = contents + rel->r_offset;
3265
3266 switch (howto->size)
3267 {
3268 case 0:
3269 addend = bfd_get_8 (input_bfd, where);
3270 if (howto->pc_relative)
3271 {
3272 addend = (addend ^ 0x80) - 0x80;
3273 addend += 1;
3274 }
3275 break;
3276 case 1:
3277 addend = bfd_get_16 (input_bfd, where);
3278 if (howto->pc_relative)
3279 {
3280 addend = (addend ^ 0x8000) - 0x8000;
3281 addend += 2;
3282 }
3283 break;
3284 case 2:
3285 addend = bfd_get_32 (input_bfd, where);
3286 if (howto->pc_relative)
3287 {
3288 addend = (addend ^ 0x80000000) - 0x80000000;
3289 addend += 4;
3290 }
3291 break;
3292 default:
3293 abort ();
3294 }
3295
3296 if (info->relocatable)
3297 addend += sec->output_offset;
3298 else
3299 {
3300 asection *msec = sec;
3301 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3302 addend);
3303 addend -= relocation;
3304 addend += msec->output_section->vma + msec->output_offset;
3305 }
3306
3307 switch (howto->size)
3308 {
3309 case 0:
3310 /* FIXME: overflow checks. */
3311 if (howto->pc_relative)
3312 addend -= 1;
3313 bfd_put_8 (input_bfd, addend, where);
3314 break;
3315 case 1:
3316 if (howto->pc_relative)
3317 addend -= 2;
3318 bfd_put_16 (input_bfd, addend, where);
3319 break;
3320 case 2:
3321 if (howto->pc_relative)
3322 addend -= 4;
3323 bfd_put_32 (input_bfd, addend, where);
3324 break;
3325 }
3326 }
3327 else if (!info->relocatable
3328 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3329 {
3330 /* Relocate against local STT_GNU_IFUNC symbol. */
3331 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3332 FALSE);
3333 if (h == NULL)
3334 abort ();
3335
3336 /* Set STT_GNU_IFUNC symbol value. */
3337 h->root.u.def.value = sym->st_value;
3338 h->root.u.def.section = sec;
3339 }
3340 }
3341 else
3342 {
3343 bfd_boolean warned ATTRIBUTE_UNUSED;
3344
3345 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3346 r_symndx, symtab_hdr, sym_hashes,
3347 h, sec, relocation,
3348 unresolved_reloc, warned);
3349 }
3350
3351 if (sec != NULL && discarded_section (sec))
3352 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3353 rel, 1, relend, howto, 0, contents);
3354
3355 if (info->relocatable)
3356 continue;
3357
3358 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3359 it here if it is defined in a non-shared object. */
3360 if (h != NULL
3361 && h->type == STT_GNU_IFUNC
3362 && h->def_regular)
3363 {
3364 asection *plt, *gotplt, *base_got;
3365 bfd_vma plt_index;
3366 const char *name;
3367
3368 if ((input_section->flags & SEC_ALLOC) == 0
3369 || h->plt.offset == (bfd_vma) -1)
3370 abort ();
3371
3372 /* STT_GNU_IFUNC symbol must go through PLT. */
3373 if (htab->elf.splt != NULL)
3374 {
3375 plt = htab->elf.splt;
3376 gotplt = htab->elf.sgotplt;
3377 }
3378 else
3379 {
3380 plt = htab->elf.iplt;
3381 gotplt = htab->elf.igotplt;
3382 }
3383
3384 relocation = (plt->output_section->vma
3385 + plt->output_offset + h->plt.offset);
3386
3387 switch (r_type)
3388 {
3389 default:
3390 if (h->root.root.string)
3391 name = h->root.root.string;
3392 else
3393 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3394 NULL);
3395 (*_bfd_error_handler)
3396 (_("%B: relocation %s against STT_GNU_IFUNC "
3397 "symbol `%s' isn't handled by %s"), input_bfd,
3398 elf_howto_table[r_type].name,
3399 name, __FUNCTION__);
3400 bfd_set_error (bfd_error_bad_value);
3401 return FALSE;
3402
3403 case R_386_32:
3404 /* Generate dynamic relcoation only when there is a
3405 non-GOT reference in a shared object. */
3406 if (info->shared && h->non_got_ref)
3407 {
3408 Elf_Internal_Rela outrel;
3409 bfd_byte *loc;
3410 asection *sreloc;
3411 bfd_vma offset;
3412
3413 /* Need a dynamic relocation to get the real function
3414 adddress. */
3415 offset = _bfd_elf_section_offset (output_bfd,
3416 info,
3417 input_section,
3418 rel->r_offset);
3419 if (offset == (bfd_vma) -1
3420 || offset == (bfd_vma) -2)
3421 abort ();
3422
3423 outrel.r_offset = (input_section->output_section->vma
3424 + input_section->output_offset
3425 + offset);
3426
3427 if (h->dynindx == -1
3428 || h->forced_local
3429 || info->executable)
3430 {
3431 /* This symbol is resolved locally. */
3432 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3433 bfd_put_32 (output_bfd,
3434 (h->root.u.def.value
3435 + h->root.u.def.section->output_section->vma
3436 + h->root.u.def.section->output_offset),
3437 contents + offset);
3438 }
3439 else
3440 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3441
3442 sreloc = htab->elf.irelifunc;
3443 loc = sreloc->contents;
3444 loc += (sreloc->reloc_count++
3445 * sizeof (Elf32_External_Rel));
3446 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3447
3448 /* If this reloc is against an external symbol, we
3449 do not want to fiddle with the addend. Otherwise,
3450 we need to include the symbol value so that it
3451 becomes an addend for the dynamic reloc. For an
3452 internal symbol, we have updated addend. */
3453 continue;
3454 }
3455 /* FALLTHROUGH */
3456 case R_386_PC32:
3457 case R_386_PLT32:
3458 goto do_relocation;
3459
3460 case R_386_GOT32:
3461 base_got = htab->elf.sgot;
3462 off = h->got.offset;
3463
3464 if (base_got == NULL)
3465 abort ();
3466
3467 if (off == (bfd_vma) -1)
3468 {
3469 /* We can't use h->got.offset here to save state, or
3470 even just remember the offset, as finish_dynamic_symbol
3471 would use that as offset into .got. */
3472
3473 if (htab->elf.splt != NULL)
3474 {
3475 plt_index = h->plt.offset / plt_entry_size - 1;
3476 off = (plt_index + 3) * 4;
3477 base_got = htab->elf.sgotplt;
3478 }
3479 else
3480 {
3481 plt_index = h->plt.offset / plt_entry_size;
3482 off = plt_index * 4;
3483 base_got = htab->elf.igotplt;
3484 }
3485
3486 if (h->dynindx == -1
3487 || h->forced_local
3488 || info->symbolic)
3489 {
3490 /* This references the local defitionion. We must
3491 initialize this entry in the global offset table.
3492 Since the offset must always be a multiple of 8,
3493 we use the least significant bit to record
3494 whether we have initialized it already.
3495
3496 When doing a dynamic link, we create a .rela.got
3497 relocation entry to initialize the value. This
3498 is done in the finish_dynamic_symbol routine. */
3499 if ((off & 1) != 0)
3500 off &= ~1;
3501 else
3502 {
3503 bfd_put_32 (output_bfd, relocation,
3504 base_got->contents + off);
3505 h->got.offset |= 1;
3506 }
3507 }
3508
3509 relocation = off;
3510
3511 /* Adjust for static executables. */
3512 if (htab->elf.splt == NULL)
3513 relocation += gotplt->output_offset;
3514 }
3515 else
3516 {
3517 relocation = (base_got->output_section->vma
3518 + base_got->output_offset + off
3519 - gotplt->output_section->vma
3520 - gotplt->output_offset);
3521 /* Adjust for static executables. */
3522 if (htab->elf.splt == NULL)
3523 relocation += gotplt->output_offset;
3524 }
3525
3526 goto do_relocation;
3527
3528 case R_386_GOTOFF:
3529 relocation -= (gotplt->output_section->vma
3530 + gotplt->output_offset);
3531 goto do_relocation;
3532 }
3533 }
3534
3535 switch (r_type)
3536 {
3537 case R_386_GOT32:
3538 /* Relocation is to the entry for this symbol in the global
3539 offset table. */
3540 if (htab->elf.sgot == NULL)
3541 abort ();
3542
3543 if (h != NULL)
3544 {
3545 bfd_boolean dyn;
3546
3547 off = h->got.offset;
3548 dyn = htab->elf.dynamic_sections_created;
3549 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3550 || (info->shared
3551 && SYMBOL_REFERENCES_LOCAL (info, h))
3552 || (ELF_ST_VISIBILITY (h->other)
3553 && h->root.type == bfd_link_hash_undefweak))
3554 {
3555 /* This is actually a static link, or it is a
3556 -Bsymbolic link and the symbol is defined
3557 locally, or the symbol was forced to be local
3558 because of a version file. We must initialize
3559 this entry in the global offset table. Since the
3560 offset must always be a multiple of 4, we use the
3561 least significant bit to record whether we have
3562 initialized it already.
3563
3564 When doing a dynamic link, we create a .rel.got
3565 relocation entry to initialize the value. This
3566 is done in the finish_dynamic_symbol routine. */
3567 if ((off & 1) != 0)
3568 off &= ~1;
3569 else
3570 {
3571 bfd_put_32 (output_bfd, relocation,
3572 htab->elf.sgot->contents + off);
3573 h->got.offset |= 1;
3574 }
3575 }
3576 else
3577 unresolved_reloc = FALSE;
3578 }
3579 else
3580 {
3581 if (local_got_offsets == NULL)
3582 abort ();
3583
3584 off = local_got_offsets[r_symndx];
3585
3586 /* The offset must always be a multiple of 4. We use
3587 the least significant bit to record whether we have
3588 already generated the necessary reloc. */
3589 if ((off & 1) != 0)
3590 off &= ~1;
3591 else
3592 {
3593 bfd_put_32 (output_bfd, relocation,
3594 htab->elf.sgot->contents + off);
3595
3596 if (info->shared)
3597 {
3598 asection *s;
3599 Elf_Internal_Rela outrel;
3600 bfd_byte *loc;
3601
3602 s = htab->elf.srelgot;
3603 if (s == NULL)
3604 abort ();
3605
3606 outrel.r_offset = (htab->elf.sgot->output_section->vma
3607 + htab->elf.sgot->output_offset
3608 + off);
3609 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3610 loc = s->contents;
3611 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3612 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3613 }
3614
3615 local_got_offsets[r_symndx] |= 1;
3616 }
3617 }
3618
3619 if (off >= (bfd_vma) -2)
3620 abort ();
3621
3622 relocation = htab->elf.sgot->output_section->vma
3623 + htab->elf.sgot->output_offset + off
3624 - htab->elf.sgotplt->output_section->vma
3625 - htab->elf.sgotplt->output_offset;
3626 break;
3627
3628 case R_386_GOTOFF:
3629 /* Relocation is relative to the start of the global offset
3630 table. */
3631
3632 /* Check to make sure it isn't a protected function symbol
3633 for shared library since it may not be local when used
3634 as function address. We also need to make sure that a
3635 symbol is defined locally. */
3636 if (info->shared && h)
3637 {
3638 if (!h->def_regular)
3639 {
3640 const char *v;
3641
3642 switch (ELF_ST_VISIBILITY (h->other))
3643 {
3644 case STV_HIDDEN:
3645 v = _("hidden symbol");
3646 break;
3647 case STV_INTERNAL:
3648 v = _("internal symbol");
3649 break;
3650 case STV_PROTECTED:
3651 v = _("protected symbol");
3652 break;
3653 default:
3654 v = _("symbol");
3655 break;
3656 }
3657
3658 (*_bfd_error_handler)
3659 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3660 input_bfd, v, h->root.root.string);
3661 bfd_set_error (bfd_error_bad_value);
3662 return FALSE;
3663 }
3664 else if (!info->executable
3665 && !SYMBOLIC_BIND (info, h)
3666 && h->type == STT_FUNC
3667 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3668 {
3669 (*_bfd_error_handler)
3670 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3671 input_bfd, h->root.root.string);
3672 bfd_set_error (bfd_error_bad_value);
3673 return FALSE;
3674 }
3675 }
3676
3677 /* Note that sgot is not involved in this
3678 calculation. We always want the start of .got.plt. If we
3679 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3680 permitted by the ABI, we might have to change this
3681 calculation. */
3682 relocation -= htab->elf.sgotplt->output_section->vma
3683 + htab->elf.sgotplt->output_offset;
3684 break;
3685
3686 case R_386_GOTPC:
3687 /* Use global offset table as symbol value. */
3688 relocation = htab->elf.sgotplt->output_section->vma
3689 + htab->elf.sgotplt->output_offset;
3690 unresolved_reloc = FALSE;
3691 break;
3692
3693 case R_386_PLT32:
3694 /* Relocation is to the entry for this symbol in the
3695 procedure linkage table. */
3696
3697 /* Resolve a PLT32 reloc against a local symbol directly,
3698 without using the procedure linkage table. */
3699 if (h == NULL)
3700 break;
3701
3702 if (h->plt.offset == (bfd_vma) -1
3703 || htab->elf.splt == NULL)
3704 {
3705 /* We didn't make a PLT entry for this symbol. This
3706 happens when statically linking PIC code, or when
3707 using -Bsymbolic. */
3708 break;
3709 }
3710
3711 relocation = (htab->elf.splt->output_section->vma
3712 + htab->elf.splt->output_offset
3713 + h->plt.offset);
3714 unresolved_reloc = FALSE;
3715 break;
3716
3717 case R_386_32:
3718 case R_386_PC32:
3719 if ((input_section->flags & SEC_ALLOC) == 0
3720 || is_vxworks_tls)
3721 break;
3722
3723 if ((info->shared
3724 && (h == NULL
3725 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3726 || h->root.type != bfd_link_hash_undefweak)
3727 && (r_type != R_386_PC32
3728 || !SYMBOL_CALLS_LOCAL (info, h)))
3729 || (ELIMINATE_COPY_RELOCS
3730 && !info->shared
3731 && h != NULL
3732 && h->dynindx != -1
3733 && !h->non_got_ref
3734 && ((h->def_dynamic
3735 && !h->def_regular)
3736 || h->root.type == bfd_link_hash_undefweak
3737 || h->root.type == bfd_link_hash_undefined)))
3738 {
3739 Elf_Internal_Rela outrel;
3740 bfd_byte *loc;
3741 bfd_boolean skip, relocate;
3742 asection *sreloc;
3743
3744 /* When generating a shared object, these relocations
3745 are copied into the output file to be resolved at run
3746 time. */
3747
3748 skip = FALSE;
3749 relocate = FALSE;
3750
3751 outrel.r_offset =
3752 _bfd_elf_section_offset (output_bfd, info, input_section,
3753 rel->r_offset);
3754 if (outrel.r_offset == (bfd_vma) -1)
3755 skip = TRUE;
3756 else if (outrel.r_offset == (bfd_vma) -2)
3757 skip = TRUE, relocate = TRUE;
3758 outrel.r_offset += (input_section->output_section->vma
3759 + input_section->output_offset);
3760
3761 if (skip)
3762 memset (&outrel, 0, sizeof outrel);
3763 else if (h != NULL
3764 && h->dynindx != -1
3765 && (r_type == R_386_PC32
3766 || !info->shared
3767 || !SYMBOLIC_BIND (info, h)
3768 || !h->def_regular))
3769 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3770 else
3771 {
3772 /* This symbol is local, or marked to become local. */
3773 relocate = TRUE;
3774 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3775 }
3776
3777 sreloc = elf_section_data (input_section)->sreloc;
3778
3779 if (sreloc == NULL || sreloc->contents == NULL)
3780 {
3781 r = bfd_reloc_notsupported;
3782 goto check_relocation_error;
3783 }
3784
3785 loc = sreloc->contents;
3786 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3787
3788 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3789
3790 /* If this reloc is against an external symbol, we do
3791 not want to fiddle with the addend. Otherwise, we
3792 need to include the symbol value so that it becomes
3793 an addend for the dynamic reloc. */
3794 if (! relocate)
3795 continue;
3796 }
3797 break;
3798
3799 case R_386_TLS_IE:
3800 if (!info->executable)
3801 {
3802 Elf_Internal_Rela outrel;
3803 bfd_byte *loc;
3804 asection *sreloc;
3805
3806 outrel.r_offset = rel->r_offset
3807 + input_section->output_section->vma
3808 + input_section->output_offset;
3809 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3810 sreloc = elf_section_data (input_section)->sreloc;
3811 if (sreloc == NULL)
3812 abort ();
3813 loc = sreloc->contents;
3814 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3815 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3816 }
3817 /* Fall through */
3818
3819 case R_386_TLS_GD:
3820 case R_386_TLS_GOTDESC:
3821 case R_386_TLS_DESC_CALL:
3822 case R_386_TLS_IE_32:
3823 case R_386_TLS_GOTIE:
3824 tls_type = GOT_UNKNOWN;
3825 if (h == NULL && local_got_offsets)
3826 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3827 else if (h != NULL)
3828 tls_type = elf_i386_hash_entry(h)->tls_type;
3829 if (tls_type == GOT_TLS_IE)
3830 tls_type = GOT_TLS_IE_NEG;
3831
3832 if (! elf_i386_tls_transition (info, input_bfd,
3833 input_section, contents,
3834 symtab_hdr, sym_hashes,
3835 &r_type, tls_type, rel,
3836 relend, h, r_symndx))
3837 return FALSE;
3838
3839 if (r_type == R_386_TLS_LE_32)
3840 {
3841 BFD_ASSERT (! unresolved_reloc);
3842 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3843 {
3844 unsigned int type;
3845 bfd_vma roff;
3846
3847 /* GD->LE transition. */
3848 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3849 if (type == 0x04)
3850 {
3851 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3852 Change it into:
3853 movl %gs:0, %eax; subl $foo@tpoff, %eax
3854 (6 byte form of subl). */
3855 memcpy (contents + rel->r_offset - 3,
3856 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3857 roff = rel->r_offset + 5;
3858 }
3859 else
3860 {
3861 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3862 Change it into:
3863 movl %gs:0, %eax; subl $foo@tpoff, %eax
3864 (6 byte form of subl). */
3865 memcpy (contents + rel->r_offset - 2,
3866 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3867 roff = rel->r_offset + 6;
3868 }
3869 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3870 contents + roff);
3871 /* Skip R_386_PC32/R_386_PLT32. */
3872 rel++;
3873 continue;
3874 }
3875 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3876 {
3877 /* GDesc -> LE transition.
3878 It's originally something like:
3879 leal x@tlsdesc(%ebx), %eax
3880
3881 leal x@ntpoff, %eax
3882
3883 Registers other than %eax may be set up here. */
3884
3885 unsigned int val;
3886 bfd_vma roff;
3887
3888 roff = rel->r_offset;
3889 val = bfd_get_8 (input_bfd, contents + roff - 1);
3890
3891 /* Now modify the instruction as appropriate. */
3892 /* aoliva FIXME: remove the above and xor the byte
3893 below with 0x86. */
3894 bfd_put_8 (output_bfd, val ^ 0x86,
3895 contents + roff - 1);
3896 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3897 contents + roff);
3898 continue;
3899 }
3900 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3901 {
3902 /* GDesc -> LE transition.
3903 It's originally:
3904 call *(%eax)
3905 Turn it into:
3906 xchg %ax,%ax */
3907
3908 bfd_vma roff;
3909
3910 roff = rel->r_offset;
3911 bfd_put_8 (output_bfd, 0x66, contents + roff);
3912 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3913 continue;
3914 }
3915 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3916 {
3917 unsigned int val;
3918
3919 /* IE->LE transition:
3920 Originally it can be one of:
3921 movl foo, %eax
3922 movl foo, %reg
3923 addl foo, %reg
3924 We change it into:
3925 movl $foo, %eax
3926 movl $foo, %reg
3927 addl $foo, %reg. */
3928 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3929 if (val == 0xa1)
3930 {
3931 /* movl foo, %eax. */
3932 bfd_put_8 (output_bfd, 0xb8,
3933 contents + rel->r_offset - 1);
3934 }
3935 else
3936 {
3937 unsigned int type;
3938
3939 type = bfd_get_8 (input_bfd,
3940 contents + rel->r_offset - 2);
3941 switch (type)
3942 {
3943 case 0x8b:
3944 /* movl */
3945 bfd_put_8 (output_bfd, 0xc7,
3946 contents + rel->r_offset - 2);
3947 bfd_put_8 (output_bfd,
3948 0xc0 | ((val >> 3) & 7),
3949 contents + rel->r_offset - 1);
3950 break;
3951 case 0x03:
3952 /* addl */
3953 bfd_put_8 (output_bfd, 0x81,
3954 contents + rel->r_offset - 2);
3955 bfd_put_8 (output_bfd,
3956 0xc0 | ((val >> 3) & 7),
3957 contents + rel->r_offset - 1);
3958 break;
3959 default:
3960 BFD_FAIL ();
3961 break;
3962 }
3963 }
3964 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3965 contents + rel->r_offset);
3966 continue;
3967 }
3968 else
3969 {
3970 unsigned int val, type;
3971
3972 /* {IE_32,GOTIE}->LE transition:
3973 Originally it can be one of:
3974 subl foo(%reg1), %reg2
3975 movl foo(%reg1), %reg2
3976 addl foo(%reg1), %reg2
3977 We change it into:
3978 subl $foo, %reg2
3979 movl $foo, %reg2 (6 byte form)
3980 addl $foo, %reg2. */
3981 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3982 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3983 if (type == 0x8b)
3984 {
3985 /* movl */
3986 bfd_put_8 (output_bfd, 0xc7,
3987 contents + rel->r_offset - 2);
3988 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3989 contents + rel->r_offset - 1);
3990 }
3991 else if (type == 0x2b)
3992 {
3993 /* subl */
3994 bfd_put_8 (output_bfd, 0x81,
3995 contents + rel->r_offset - 2);
3996 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3997 contents + rel->r_offset - 1);
3998 }
3999 else if (type == 0x03)
4000 {
4001 /* addl */
4002 bfd_put_8 (output_bfd, 0x81,
4003 contents + rel->r_offset - 2);
4004 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4005 contents + rel->r_offset - 1);
4006 }
4007 else
4008 BFD_FAIL ();
4009 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4010 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4011 contents + rel->r_offset);
4012 else
4013 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4014 contents + rel->r_offset);
4015 continue;
4016 }
4017 }
4018
4019 if (htab->elf.sgot == NULL)
4020 abort ();
4021
4022 if (h != NULL)
4023 {
4024 off = h->got.offset;
4025 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4026 }
4027 else
4028 {
4029 if (local_got_offsets == NULL)
4030 abort ();
4031
4032 off = local_got_offsets[r_symndx];
4033 offplt = local_tlsdesc_gotents[r_symndx];
4034 }
4035
4036 if ((off & 1) != 0)
4037 off &= ~1;
4038 else
4039 {
4040 Elf_Internal_Rela outrel;
4041 bfd_byte *loc;
4042 int dr_type;
4043 asection *sreloc;
4044
4045 if (htab->elf.srelgot == NULL)
4046 abort ();
4047
4048 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4049
4050 if (GOT_TLS_GDESC_P (tls_type))
4051 {
4052 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4053 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4054 <= htab->elf.sgotplt->size);
4055 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4056 + htab->elf.sgotplt->output_offset
4057 + offplt
4058 + htab->sgotplt_jump_table_size);
4059 sreloc = htab->elf.srelplt;
4060 loc = sreloc->contents;
4061 loc += (htab->next_tls_desc_index++
4062 * sizeof (Elf32_External_Rel));
4063 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4064 <= sreloc->contents + sreloc->size);
4065 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4066 if (indx == 0)
4067 {
4068 BFD_ASSERT (! unresolved_reloc);
4069 bfd_put_32 (output_bfd,
4070 relocation - elf_i386_dtpoff_base (info),
4071 htab->elf.sgotplt->contents + offplt
4072 + htab->sgotplt_jump_table_size + 4);
4073 }
4074 else
4075 {
4076 bfd_put_32 (output_bfd, 0,
4077 htab->elf.sgotplt->contents + offplt
4078 + htab->sgotplt_jump_table_size + 4);
4079 }
4080 }
4081
4082 sreloc = htab->elf.srelgot;
4083
4084 outrel.r_offset = (htab->elf.sgot->output_section->vma
4085 + htab->elf.sgot->output_offset + off);
4086
4087 if (GOT_TLS_GD_P (tls_type))
4088 dr_type = R_386_TLS_DTPMOD32;
4089 else if (GOT_TLS_GDESC_P (tls_type))
4090 goto dr_done;
4091 else if (tls_type == GOT_TLS_IE_POS)
4092 dr_type = R_386_TLS_TPOFF;
4093 else
4094 dr_type = R_386_TLS_TPOFF32;
4095
4096 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4097 bfd_put_32 (output_bfd,
4098 relocation - elf_i386_dtpoff_base (info),
4099 htab->elf.sgot->contents + off);
4100 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4101 bfd_put_32 (output_bfd,
4102 elf_i386_dtpoff_base (info) - relocation,
4103 htab->elf.sgot->contents + off);
4104 else if (dr_type != R_386_TLS_DESC)
4105 bfd_put_32 (output_bfd, 0,
4106 htab->elf.sgot->contents + off);
4107 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4108
4109 loc = sreloc->contents;
4110 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4111 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4112 <= sreloc->contents + sreloc->size);
4113 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4114
4115 if (GOT_TLS_GD_P (tls_type))
4116 {
4117 if (indx == 0)
4118 {
4119 BFD_ASSERT (! unresolved_reloc);
4120 bfd_put_32 (output_bfd,
4121 relocation - elf_i386_dtpoff_base (info),
4122 htab->elf.sgot->contents + off + 4);
4123 }
4124 else
4125 {
4126 bfd_put_32 (output_bfd, 0,
4127 htab->elf.sgot->contents + off + 4);
4128 outrel.r_info = ELF32_R_INFO (indx,
4129 R_386_TLS_DTPOFF32);
4130 outrel.r_offset += 4;
4131 sreloc->reloc_count++;
4132 loc += sizeof (Elf32_External_Rel);
4133 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4134 <= sreloc->contents + sreloc->size);
4135 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4136 }
4137 }
4138 else if (tls_type == GOT_TLS_IE_BOTH)
4139 {
4140 bfd_put_32 (output_bfd,
4141 (indx == 0
4142 ? relocation - elf_i386_dtpoff_base (info)
4143 : 0),
4144 htab->elf.sgot->contents + off + 4);
4145 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4146 outrel.r_offset += 4;
4147 sreloc->reloc_count++;
4148 loc += sizeof (Elf32_External_Rel);
4149 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4150 }
4151
4152 dr_done:
4153 if (h != NULL)
4154 h->got.offset |= 1;
4155 else
4156 local_got_offsets[r_symndx] |= 1;
4157 }
4158
4159 if (off >= (bfd_vma) -2
4160 && ! GOT_TLS_GDESC_P (tls_type))
4161 abort ();
4162 if (r_type == R_386_TLS_GOTDESC
4163 || r_type == R_386_TLS_DESC_CALL)
4164 {
4165 relocation = htab->sgotplt_jump_table_size + offplt;
4166 unresolved_reloc = FALSE;
4167 }
4168 else if (r_type == ELF32_R_TYPE (rel->r_info))
4169 {
4170 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4171 + htab->elf.sgotplt->output_offset;
4172 relocation = htab->elf.sgot->output_section->vma
4173 + htab->elf.sgot->output_offset + off - g_o_t;
4174 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4175 && tls_type == GOT_TLS_IE_BOTH)
4176 relocation += 4;
4177 if (r_type == R_386_TLS_IE)
4178 relocation += g_o_t;
4179 unresolved_reloc = FALSE;
4180 }
4181 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4182 {
4183 unsigned int val, type;
4184 bfd_vma roff;
4185
4186 /* GD->IE transition. */
4187 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4188 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4189 if (type == 0x04)
4190 {
4191 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4192 Change it into:
4193 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4194 val >>= 3;
4195 roff = rel->r_offset - 3;
4196 }
4197 else
4198 {
4199 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4200 Change it into:
4201 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4202 roff = rel->r_offset - 2;
4203 }
4204 memcpy (contents + roff,
4205 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4206 contents[roff + 7] = 0x80 | (val & 7);
4207 /* If foo is used only with foo@gotntpoff(%reg) and
4208 foo@indntpoff, but not with foo@gottpoff(%reg), change
4209 subl $foo@gottpoff(%reg), %eax
4210 into:
4211 addl $foo@gotntpoff(%reg), %eax. */
4212 if (tls_type == GOT_TLS_IE_POS)
4213 contents[roff + 6] = 0x03;
4214 bfd_put_32 (output_bfd,
4215 htab->elf.sgot->output_section->vma
4216 + htab->elf.sgot->output_offset + off
4217 - htab->elf.sgotplt->output_section->vma
4218 - htab->elf.sgotplt->output_offset,
4219 contents + roff + 8);
4220 /* Skip R_386_PLT32. */
4221 rel++;
4222 continue;
4223 }
4224 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4225 {
4226 /* GDesc -> IE transition.
4227 It's originally something like:
4228 leal x@tlsdesc(%ebx), %eax
4229
4230 Change it to:
4231 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4232 or:
4233 movl x@gottpoff(%ebx), %eax # before negl %eax
4234
4235 Registers other than %eax may be set up here. */
4236
4237 bfd_vma roff;
4238
4239 /* First, make sure it's a leal adding ebx to a 32-bit
4240 offset into any register, although it's probably
4241 almost always going to be eax. */
4242 roff = rel->r_offset;
4243
4244 /* Now modify the instruction as appropriate. */
4245 /* To turn a leal into a movl in the form we use it, it
4246 suffices to change the first byte from 0x8d to 0x8b.
4247 aoliva FIXME: should we decide to keep the leal, all
4248 we have to do is remove the statement below, and
4249 adjust the relaxation of R_386_TLS_DESC_CALL. */
4250 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4251
4252 if (tls_type == GOT_TLS_IE_BOTH)
4253 off += 4;
4254
4255 bfd_put_32 (output_bfd,
4256 htab->elf.sgot->output_section->vma
4257 + htab->elf.sgot->output_offset + off
4258 - htab->elf.sgotplt->output_section->vma
4259 - htab->elf.sgotplt->output_offset,
4260 contents + roff);
4261 continue;
4262 }
4263 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4264 {
4265 /* GDesc -> IE transition.
4266 It's originally:
4267 call *(%eax)
4268
4269 Change it to:
4270 xchg %ax,%ax
4271 or
4272 negl %eax
4273 depending on how we transformed the TLS_GOTDESC above.
4274 */
4275
4276 bfd_vma roff;
4277
4278 roff = rel->r_offset;
4279
4280 /* Now modify the instruction as appropriate. */
4281 if (tls_type != GOT_TLS_IE_NEG)
4282 {
4283 /* xchg %ax,%ax */
4284 bfd_put_8 (output_bfd, 0x66, contents + roff);
4285 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4286 }
4287 else
4288 {
4289 /* negl %eax */
4290 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4291 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4292 }
4293
4294 continue;
4295 }
4296 else
4297 BFD_ASSERT (FALSE);
4298 break;
4299
4300 case R_386_TLS_LDM:
4301 if (! elf_i386_tls_transition (info, input_bfd,
4302 input_section, contents,
4303 symtab_hdr, sym_hashes,
4304 &r_type, GOT_UNKNOWN, rel,
4305 relend, h, r_symndx))
4306 return FALSE;
4307
4308 if (r_type != R_386_TLS_LDM)
4309 {
4310 /* LD->LE transition:
4311 leal foo(%reg), %eax; call ___tls_get_addr.
4312 We change it into:
4313 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4314 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4315 memcpy (contents + rel->r_offset - 2,
4316 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4317 /* Skip R_386_PC32/R_386_PLT32. */
4318 rel++;
4319 continue;
4320 }
4321
4322 if (htab->elf.sgot == NULL)
4323 abort ();
4324
4325 off = htab->tls_ldm_got.offset;
4326 if (off & 1)
4327 off &= ~1;
4328 else
4329 {
4330 Elf_Internal_Rela outrel;
4331 bfd_byte *loc;
4332
4333 if (htab->elf.srelgot == NULL)
4334 abort ();
4335
4336 outrel.r_offset = (htab->elf.sgot->output_section->vma
4337 + htab->elf.sgot->output_offset + off);
4338
4339 bfd_put_32 (output_bfd, 0,
4340 htab->elf.sgot->contents + off);
4341 bfd_put_32 (output_bfd, 0,
4342 htab->elf.sgot->contents + off + 4);
4343 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4344 loc = htab->elf.srelgot->contents;
4345 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4346 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4347 htab->tls_ldm_got.offset |= 1;
4348 }
4349 relocation = htab->elf.sgot->output_section->vma
4350 + htab->elf.sgot->output_offset + off
4351 - htab->elf.sgotplt->output_section->vma
4352 - htab->elf.sgotplt->output_offset;
4353 unresolved_reloc = FALSE;
4354 break;
4355
4356 case R_386_TLS_LDO_32:
4357 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4358 relocation -= elf_i386_dtpoff_base (info);
4359 else
4360 /* When converting LDO to LE, we must negate. */
4361 relocation = -elf_i386_tpoff (info, relocation);
4362 break;
4363
4364 case R_386_TLS_LE_32:
4365 case R_386_TLS_LE:
4366 if (!info->executable)
4367 {
4368 Elf_Internal_Rela outrel;
4369 asection *sreloc;
4370 bfd_byte *loc;
4371
4372 outrel.r_offset = rel->r_offset
4373 + input_section->output_section->vma
4374 + input_section->output_offset;
4375 if (h != NULL && h->dynindx != -1)
4376 indx = h->dynindx;
4377 else
4378 indx = 0;
4379 if (r_type == R_386_TLS_LE_32)
4380 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4381 else
4382 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4383 sreloc = elf_section_data (input_section)->sreloc;
4384 if (sreloc == NULL)
4385 abort ();
4386 loc = sreloc->contents;
4387 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4388 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4389 if (indx)
4390 continue;
4391 else if (r_type == R_386_TLS_LE_32)
4392 relocation = elf_i386_dtpoff_base (info) - relocation;
4393 else
4394 relocation -= elf_i386_dtpoff_base (info);
4395 }
4396 else if (r_type == R_386_TLS_LE_32)
4397 relocation = elf_i386_tpoff (info, relocation);
4398 else
4399 relocation = -elf_i386_tpoff (info, relocation);
4400 break;
4401
4402 default:
4403 break;
4404 }
4405
4406 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4407 because such sections are not SEC_ALLOC and thus ld.so will
4408 not process them. */
4409 if (unresolved_reloc
4410 && !((input_section->flags & SEC_DEBUGGING) != 0
4411 && h->def_dynamic)
4412 && _bfd_elf_section_offset (output_bfd, info, input_section,
4413 rel->r_offset) != (bfd_vma) -1)
4414 {
4415 (*_bfd_error_handler)
4416 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4417 input_bfd,
4418 input_section,
4419 (long) rel->r_offset,
4420 howto->name,
4421 h->root.root.string);
4422 return FALSE;
4423 }
4424
4425 do_relocation:
4426 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4427 contents, rel->r_offset,
4428 relocation, 0);
4429
4430 check_relocation_error:
4431 if (r != bfd_reloc_ok)
4432 {
4433 const char *name;
4434
4435 if (h != NULL)
4436 name = h->root.root.string;
4437 else
4438 {
4439 name = bfd_elf_string_from_elf_section (input_bfd,
4440 symtab_hdr->sh_link,
4441 sym->st_name);
4442 if (name == NULL)
4443 return FALSE;
4444 if (*name == '\0')
4445 name = bfd_section_name (input_bfd, sec);
4446 }
4447
4448 if (r == bfd_reloc_overflow)
4449 {
4450 if (! ((*info->callbacks->reloc_overflow)
4451 (info, (h ? &h->root : NULL), name, howto->name,
4452 (bfd_vma) 0, input_bfd, input_section,
4453 rel->r_offset)))
4454 return FALSE;
4455 }
4456 else
4457 {
4458 (*_bfd_error_handler)
4459 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4460 input_bfd, input_section,
4461 (long) rel->r_offset, name, (int) r);
4462 return FALSE;
4463 }
4464 }
4465 }
4466
4467 return TRUE;
4468 }
4469
4470 /* Finish up dynamic symbol handling. We set the contents of various
4471 dynamic sections here. */
4472
4473 static bfd_boolean
4474 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4475 struct bfd_link_info *info,
4476 struct elf_link_hash_entry *h,
4477 Elf_Internal_Sym *sym)
4478 {
4479 struct elf_i386_link_hash_table *htab;
4480 unsigned plt_entry_size;
4481 const struct elf_i386_backend_data *abed;
4482
4483 htab = elf_i386_hash_table (info);
4484 if (htab == NULL)
4485 return FALSE;
4486
4487 abed = get_elf_i386_backend_data (output_bfd);
4488 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4489
4490 if (h->plt.offset != (bfd_vma) -1)
4491 {
4492 bfd_vma plt_index;
4493 bfd_vma got_offset;
4494 Elf_Internal_Rela rel;
4495 bfd_byte *loc;
4496 asection *plt, *gotplt, *relplt;
4497
4498 /* When building a static executable, use .iplt, .igot.plt and
4499 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4500 if (htab->elf.splt != NULL)
4501 {
4502 plt = htab->elf.splt;
4503 gotplt = htab->elf.sgotplt;
4504 relplt = htab->elf.srelplt;
4505 }
4506 else
4507 {
4508 plt = htab->elf.iplt;
4509 gotplt = htab->elf.igotplt;
4510 relplt = htab->elf.irelplt;
4511 }
4512
4513 /* This symbol has an entry in the procedure linkage table. Set
4514 it up. */
4515
4516 if ((h->dynindx == -1
4517 && !((h->forced_local || info->executable)
4518 && h->def_regular
4519 && h->type == STT_GNU_IFUNC))
4520 || plt == NULL
4521 || gotplt == NULL
4522 || relplt == NULL)
4523 return FALSE;
4524
4525 /* Get the index in the procedure linkage table which
4526 corresponds to this symbol. This is the index of this symbol
4527 in all the symbols for which we are making plt entries. The
4528 first entry in the procedure linkage table is reserved.
4529
4530 Get the offset into the .got table of the entry that
4531 corresponds to this function. Each .got entry is 4 bytes.
4532 The first three are reserved.
4533
4534 For static executables, we don't reserve anything. */
4535
4536 if (plt == htab->elf.splt)
4537 {
4538 got_offset = h->plt.offset / plt_entry_size - 1;
4539 got_offset = (got_offset + 3) * 4;
4540 }
4541 else
4542 {
4543 got_offset = h->plt.offset / plt_entry_size;
4544 got_offset = got_offset * 4;
4545 }
4546
4547 /* Fill in the entry in the procedure linkage table. */
4548 if (! info->shared)
4549 {
4550 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4551 abed->plt->plt_entry_size);
4552 bfd_put_32 (output_bfd,
4553 (gotplt->output_section->vma
4554 + gotplt->output_offset
4555 + got_offset),
4556 plt->contents + h->plt.offset
4557 + abed->plt->plt_got_offset);
4558
4559 if (abed->is_vxworks)
4560 {
4561 int s, k, reloc_index;
4562
4563 /* Create the R_386_32 relocation referencing the GOT
4564 for this PLT entry. */
4565
4566 /* S: Current slot number (zero-based). */
4567 s = ((h->plt.offset - abed->plt->plt_entry_size)
4568 / abed->plt->plt_entry_size);
4569 /* K: Number of relocations for PLTResolve. */
4570 if (info->shared)
4571 k = PLTRESOLVE_RELOCS_SHLIB;
4572 else
4573 k = PLTRESOLVE_RELOCS;
4574 /* Skip the PLTresolve relocations, and the relocations for
4575 the other PLT slots. */
4576 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4577 loc = (htab->srelplt2->contents + reloc_index
4578 * sizeof (Elf32_External_Rel));
4579
4580 rel.r_offset = (htab->elf.splt->output_section->vma
4581 + htab->elf.splt->output_offset
4582 + h->plt.offset + 2),
4583 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4584 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4585
4586 /* Create the R_386_32 relocation referencing the beginning of
4587 the PLT for this GOT entry. */
4588 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4589 + htab->elf.sgotplt->output_offset
4590 + got_offset);
4591 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4592 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4593 loc + sizeof (Elf32_External_Rel));
4594 }
4595 }
4596 else
4597 {
4598 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4599 abed->plt->plt_entry_size);
4600 bfd_put_32 (output_bfd, got_offset,
4601 plt->contents + h->plt.offset
4602 + abed->plt->plt_got_offset);
4603 }
4604
4605 /* Fill in the entry in the global offset table. */
4606 bfd_put_32 (output_bfd,
4607 (plt->output_section->vma
4608 + plt->output_offset
4609 + h->plt.offset
4610 + abed->plt->plt_lazy_offset),
4611 gotplt->contents + got_offset);
4612
4613 /* Fill in the entry in the .rel.plt section. */
4614 rel.r_offset = (gotplt->output_section->vma
4615 + gotplt->output_offset
4616 + got_offset);
4617 if (h->dynindx == -1
4618 || ((info->executable
4619 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4620 && h->def_regular
4621 && h->type == STT_GNU_IFUNC))
4622 {
4623 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4624 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4625 in the .got.plt section. */
4626 bfd_put_32 (output_bfd,
4627 (h->root.u.def.value
4628 + h->root.u.def.section->output_section->vma
4629 + h->root.u.def.section->output_offset),
4630 gotplt->contents + got_offset);
4631 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4632 /* R_386_IRELATIVE comes last. */
4633 plt_index = htab->next_irelative_index--;
4634 }
4635 else
4636 {
4637 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4638 plt_index = htab->next_jump_slot_index++;
4639 }
4640 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4641 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4642
4643 /* Don't fill PLT entry for static executables. */
4644 if (plt == htab->elf.splt)
4645 {
4646 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4647 plt->contents + h->plt.offset
4648 + abed->plt->plt_reloc_offset);
4649 bfd_put_32 (output_bfd, - (h->plt.offset
4650 + abed->plt->plt_plt_offset + 4),
4651 plt->contents + h->plt.offset
4652 + abed->plt->plt_plt_offset);
4653 }
4654
4655 if (!h->def_regular)
4656 {
4657 /* Mark the symbol as undefined, rather than as defined in
4658 the .plt section. Leave the value if there were any
4659 relocations where pointer equality matters (this is a clue
4660 for the dynamic linker, to make function pointer
4661 comparisons work between an application and shared
4662 library), otherwise set it to zero. If a function is only
4663 called from a binary, there is no need to slow down
4664 shared libraries because of that. */
4665 sym->st_shndx = SHN_UNDEF;
4666 if (!h->pointer_equality_needed)
4667 sym->st_value = 0;
4668 }
4669 }
4670
4671 if (h->got.offset != (bfd_vma) -1
4672 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4673 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4674 {
4675 Elf_Internal_Rela rel;
4676 bfd_byte *loc;
4677
4678 /* This symbol has an entry in the global offset table. Set it
4679 up. */
4680
4681 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4682 abort ();
4683
4684 rel.r_offset = (htab->elf.sgot->output_section->vma
4685 + htab->elf.sgot->output_offset
4686 + (h->got.offset & ~(bfd_vma) 1));
4687
4688 /* If this is a static link, or it is a -Bsymbolic link and the
4689 symbol is defined locally or was forced to be local because
4690 of a version file, we just want to emit a RELATIVE reloc.
4691 The entry in the global offset table will already have been
4692 initialized in the relocate_section function. */
4693 if (h->def_regular
4694 && h->type == STT_GNU_IFUNC)
4695 {
4696 if (info->shared)
4697 {
4698 /* Generate R_386_GLOB_DAT. */
4699 goto do_glob_dat;
4700 }
4701 else
4702 {
4703 asection *plt;
4704
4705 if (!h->pointer_equality_needed)
4706 abort ();
4707
4708 /* For non-shared object, we can't use .got.plt, which
4709 contains the real function addres if we need pointer
4710 equality. We load the GOT entry with the PLT entry. */
4711 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4712 bfd_put_32 (output_bfd,
4713 (plt->output_section->vma
4714 + plt->output_offset + h->plt.offset),
4715 htab->elf.sgot->contents + h->got.offset);
4716 return TRUE;
4717 }
4718 }
4719 else if (info->shared
4720 && SYMBOL_REFERENCES_LOCAL (info, h))
4721 {
4722 BFD_ASSERT((h->got.offset & 1) != 0);
4723 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4724 }
4725 else
4726 {
4727 BFD_ASSERT((h->got.offset & 1) == 0);
4728 do_glob_dat:
4729 bfd_put_32 (output_bfd, (bfd_vma) 0,
4730 htab->elf.sgot->contents + h->got.offset);
4731 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4732 }
4733
4734 loc = htab->elf.srelgot->contents;
4735 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4736 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4737 }
4738
4739 if (h->needs_copy)
4740 {
4741 Elf_Internal_Rela rel;
4742 bfd_byte *loc;
4743
4744 /* This symbol needs a copy reloc. Set it up. */
4745
4746 if (h->dynindx == -1
4747 || (h->root.type != bfd_link_hash_defined
4748 && h->root.type != bfd_link_hash_defweak)
4749 || htab->srelbss == NULL)
4750 abort ();
4751
4752 rel.r_offset = (h->root.u.def.value
4753 + h->root.u.def.section->output_section->vma
4754 + h->root.u.def.section->output_offset);
4755 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4756 loc = htab->srelbss->contents;
4757 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4758 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4759 }
4760
4761 return TRUE;
4762 }
4763
4764 /* Finish up local dynamic symbol handling. We set the contents of
4765 various dynamic sections here. */
4766
4767 static bfd_boolean
4768 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4769 {
4770 struct elf_link_hash_entry *h
4771 = (struct elf_link_hash_entry *) *slot;
4772 struct bfd_link_info *info
4773 = (struct bfd_link_info *) inf;
4774
4775 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4776 h, NULL);
4777 }
4778
4779 /* Used to decide how to sort relocs in an optimal manner for the
4780 dynamic linker, before writing them out. */
4781
4782 static enum elf_reloc_type_class
4783 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4784 {
4785 switch (ELF32_R_TYPE (rela->r_info))
4786 {
4787 case R_386_RELATIVE:
4788 return reloc_class_relative;
4789 case R_386_JUMP_SLOT:
4790 return reloc_class_plt;
4791 case R_386_COPY:
4792 return reloc_class_copy;
4793 default:
4794 return reloc_class_normal;
4795 }
4796 }
4797
4798 /* Finish up the dynamic sections. */
4799
4800 static bfd_boolean
4801 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4802 struct bfd_link_info *info)
4803 {
4804 struct elf_i386_link_hash_table *htab;
4805 bfd *dynobj;
4806 asection *sdyn;
4807 const struct elf_i386_backend_data *abed;
4808
4809 htab = elf_i386_hash_table (info);
4810 if (htab == NULL)
4811 return FALSE;
4812
4813 dynobj = htab->elf.dynobj;
4814 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4815 abed = get_elf_i386_backend_data (output_bfd);
4816
4817 if (htab->elf.dynamic_sections_created)
4818 {
4819 Elf32_External_Dyn *dyncon, *dynconend;
4820
4821 if (sdyn == NULL || htab->elf.sgot == NULL)
4822 abort ();
4823
4824 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4825 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4826 for (; dyncon < dynconend; dyncon++)
4827 {
4828 Elf_Internal_Dyn dyn;
4829 asection *s;
4830
4831 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4832
4833 switch (dyn.d_tag)
4834 {
4835 default:
4836 if (abed->is_vxworks
4837 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4838 break;
4839 continue;
4840
4841 case DT_PLTGOT:
4842 s = htab->elf.sgotplt;
4843 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4844 break;
4845
4846 case DT_JMPREL:
4847 s = htab->elf.srelplt;
4848 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4849 break;
4850
4851 case DT_PLTRELSZ:
4852 s = htab->elf.srelplt;
4853 dyn.d_un.d_val = s->size;
4854 break;
4855
4856 case DT_RELSZ:
4857 /* My reading of the SVR4 ABI indicates that the
4858 procedure linkage table relocs (DT_JMPREL) should be
4859 included in the overall relocs (DT_REL). This is
4860 what Solaris does. However, UnixWare can not handle
4861 that case. Therefore, we override the DT_RELSZ entry
4862 here to make it not include the JMPREL relocs. */
4863 s = htab->elf.srelplt;
4864 if (s == NULL)
4865 continue;
4866 dyn.d_un.d_val -= s->size;
4867 break;
4868
4869 case DT_REL:
4870 /* We may not be using the standard ELF linker script.
4871 If .rel.plt is the first .rel section, we adjust
4872 DT_REL to not include it. */
4873 s = htab->elf.srelplt;
4874 if (s == NULL)
4875 continue;
4876 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4877 continue;
4878 dyn.d_un.d_ptr += s->size;
4879 break;
4880 }
4881
4882 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4883 }
4884
4885 /* Fill in the first entry in the procedure linkage table. */
4886 if (htab->elf.splt && htab->elf.splt->size > 0)
4887 {
4888 if (info->shared)
4889 {
4890 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4891 abed->plt->plt0_entry_size);
4892 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4893 abed->plt0_pad_byte,
4894 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4895 }
4896 else
4897 {
4898 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4899 abed->plt->plt0_entry_size);
4900 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4901 abed->plt0_pad_byte,
4902 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4903 bfd_put_32 (output_bfd,
4904 (htab->elf.sgotplt->output_section->vma
4905 + htab->elf.sgotplt->output_offset
4906 + 4),
4907 htab->elf.splt->contents
4908 + abed->plt->plt0_got1_offset);
4909 bfd_put_32 (output_bfd,
4910 (htab->elf.sgotplt->output_section->vma
4911 + htab->elf.sgotplt->output_offset
4912 + 8),
4913 htab->elf.splt->contents
4914 + abed->plt->plt0_got2_offset);
4915
4916 if (abed->is_vxworks)
4917 {
4918 Elf_Internal_Rela rel;
4919
4920 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4921 On IA32 we use REL relocations so the addend goes in
4922 the PLT directly. */
4923 rel.r_offset = (htab->elf.splt->output_section->vma
4924 + htab->elf.splt->output_offset
4925 + abed->plt->plt0_got1_offset);
4926 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4927 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4928 htab->srelplt2->contents);
4929 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4930 rel.r_offset = (htab->elf.splt->output_section->vma
4931 + htab->elf.splt->output_offset
4932 + abed->plt->plt0_got2_offset);
4933 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4934 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4935 htab->srelplt2->contents +
4936 sizeof (Elf32_External_Rel));
4937 }
4938 }
4939
4940 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4941 really seem like the right value. */
4942 elf_section_data (htab->elf.splt->output_section)
4943 ->this_hdr.sh_entsize = 4;
4944
4945 /* Correct the .rel.plt.unloaded relocations. */
4946 if (abed->is_vxworks && !info->shared)
4947 {
4948 int num_plts = (htab->elf.splt->size
4949 / abed->plt->plt_entry_size) - 1;
4950 unsigned char *p;
4951
4952 p = htab->srelplt2->contents;
4953 if (info->shared)
4954 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4955 else
4956 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4957
4958 for (; num_plts; num_plts--)
4959 {
4960 Elf_Internal_Rela rel;
4961 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4962 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4963 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4964 p += sizeof (Elf32_External_Rel);
4965
4966 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4967 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4968 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4969 p += sizeof (Elf32_External_Rel);
4970 }
4971 }
4972 }
4973 }
4974
4975 if (htab->elf.sgotplt)
4976 {
4977 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4978 {
4979 (*_bfd_error_handler)
4980 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4981 return FALSE;
4982 }
4983
4984 /* Fill in the first three entries in the global offset table. */
4985 if (htab->elf.sgotplt->size > 0)
4986 {
4987 bfd_put_32 (output_bfd,
4988 (sdyn == NULL ? 0
4989 : sdyn->output_section->vma + sdyn->output_offset),
4990 htab->elf.sgotplt->contents);
4991 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4992 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4993 }
4994
4995 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4996 }
4997
4998 /* Adjust .eh_frame for .plt section. */
4999 if (htab->plt_eh_frame != NULL
5000 && htab->plt_eh_frame->contents != NULL)
5001 {
5002 if (htab->elf.splt != NULL
5003 && htab->elf.splt->size != 0
5004 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5005 && htab->elf.splt->output_section != NULL
5006 && htab->plt_eh_frame->output_section != NULL)
5007 {
5008 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5009 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5010 + htab->plt_eh_frame->output_offset
5011 + PLT_FDE_START_OFFSET;
5012 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5013 htab->plt_eh_frame->contents
5014 + PLT_FDE_START_OFFSET);
5015 }
5016 if (htab->plt_eh_frame->sec_info_type
5017 == SEC_INFO_TYPE_EH_FRAME)
5018 {
5019 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5020 htab->plt_eh_frame,
5021 htab->plt_eh_frame->contents))
5022 return FALSE;
5023 }
5024 }
5025
5026 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5027 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5028
5029 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5030 htab_traverse (htab->loc_hash_table,
5031 elf_i386_finish_local_dynamic_symbol,
5032 info);
5033
5034 return TRUE;
5035 }
5036
5037 /* Return address for Ith PLT stub in section PLT, for relocation REL
5038 or (bfd_vma) -1 if it should not be included. */
5039
5040 static bfd_vma
5041 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
5042 const arelent *rel ATTRIBUTE_UNUSED)
5043 {
5044 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5045 }
5046
5047 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5048
5049 static bfd_boolean
5050 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5051 {
5052 if (h->plt.offset != (bfd_vma) -1
5053 && !h->def_regular
5054 && !h->pointer_equality_needed)
5055 return FALSE;
5056
5057 return _bfd_elf_hash_symbol (h);
5058 }
5059
5060 /* Hook called by the linker routine which adds symbols from an object
5061 file. */
5062
5063 static bfd_boolean
5064 elf_i386_add_symbol_hook (bfd * abfd,
5065 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5066 Elf_Internal_Sym * sym,
5067 const char ** namep ATTRIBUTE_UNUSED,
5068 flagword * flagsp ATTRIBUTE_UNUSED,
5069 asection ** secp ATTRIBUTE_UNUSED,
5070 bfd_vma * valp ATTRIBUTE_UNUSED)
5071 {
5072 if ((abfd->flags & DYNAMIC) == 0
5073 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5074 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5075 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5076
5077 return TRUE;
5078 }
5079
5080 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5081 #define TARGET_LITTLE_NAME "elf32-i386"
5082 #define ELF_ARCH bfd_arch_i386
5083 #define ELF_TARGET_ID I386_ELF_DATA
5084 #define ELF_MACHINE_CODE EM_386
5085 #define ELF_MAXPAGESIZE 0x1000
5086
5087 #define elf_backend_can_gc_sections 1
5088 #define elf_backend_can_refcount 1
5089 #define elf_backend_want_got_plt 1
5090 #define elf_backend_plt_readonly 1
5091 #define elf_backend_want_plt_sym 0
5092 #define elf_backend_got_header_size 12
5093 #define elf_backend_plt_alignment 4
5094
5095 /* Support RELA for objdump of prelink objects. */
5096 #define elf_info_to_howto elf_i386_info_to_howto_rel
5097 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5098
5099 #define bfd_elf32_mkobject elf_i386_mkobject
5100
5101 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5102 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5103 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5104 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5105 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5106
5107 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5108 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5109 #define elf_backend_check_relocs elf_i386_check_relocs
5110 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5111 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5112 #define elf_backend_fake_sections elf_i386_fake_sections
5113 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5114 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5115 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5116 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5117 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5118 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5119 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5120 #define elf_backend_relocate_section elf_i386_relocate_section
5121 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5122 #define elf_backend_always_size_sections elf_i386_always_size_sections
5123 #define elf_backend_omit_section_dynsym \
5124 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5125 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5126 #define elf_backend_hash_symbol elf_i386_hash_symbol
5127 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5128 #undef elf_backend_post_process_headers
5129 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5130
5131 #include "elf32-target.h"
5132
5133 /* FreeBSD support. */
5134
5135 #undef TARGET_LITTLE_SYM
5136 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5137 #undef TARGET_LITTLE_NAME
5138 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5139 #undef ELF_OSABI
5140 #define ELF_OSABI ELFOSABI_FREEBSD
5141
5142 /* The kernel recognizes executables as valid only if they carry a
5143 "FreeBSD" label in the ELF header. So we put this label on all
5144 executables and (for simplicity) also all other object files. */
5145
5146 static void
5147 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5148 {
5149 _bfd_elf_set_osabi (abfd, info);
5150
5151 #ifdef OLD_FREEBSD_ABI_LABEL
5152 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5153 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5154 #endif
5155 }
5156
5157 #undef elf_backend_post_process_headers
5158 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5159 #undef elf32_bed
5160 #define elf32_bed elf32_i386_fbsd_bed
5161
5162 #undef elf_backend_add_symbol_hook
5163
5164 #include "elf32-target.h"
5165
5166 /* Solaris 2. */
5167
5168 #undef TARGET_LITTLE_SYM
5169 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5170 #undef TARGET_LITTLE_NAME
5171 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5172
5173 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5174 objects won't be recognized. */
5175 #undef ELF_OSABI
5176
5177 #undef elf32_bed
5178 #define elf32_bed elf32_i386_sol2_bed
5179
5180 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5181 boundary. */
5182 #undef elf_backend_static_tls_alignment
5183 #define elf_backend_static_tls_alignment 8
5184
5185 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5186
5187 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5188 File, p.63. */
5189 #undef elf_backend_want_plt_sym
5190 #define elf_backend_want_plt_sym 1
5191
5192 #include "elf32-target.h"
5193
5194 /* Native Client support. */
5195
5196 #undef TARGET_LITTLE_SYM
5197 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5198 #undef TARGET_LITTLE_NAME
5199 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5200 #undef elf32_bed
5201 #define elf32_bed elf32_i386_nacl_bed
5202
5203 #undef ELF_MAXPAGESIZE
5204 #define ELF_MAXPAGESIZE 0x10000
5205
5206 /* Restore defaults. */
5207 #undef ELF_OSABI
5208 #undef elf_backend_want_plt_sym
5209 #define elf_backend_want_plt_sym 0
5210 #undef elf_backend_post_process_headers
5211 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5212 #undef elf_backend_static_tls_alignment
5213
5214 /* NaCl uses substantially different PLT entries for the same effects. */
5215
5216 #undef elf_backend_plt_alignment
5217 #define elf_backend_plt_alignment 5
5218 #define NACL_PLT_ENTRY_SIZE 64
5219 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5220
5221 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5222 {
5223 0xff, 0x35, /* pushl contents of address */
5224 0, 0, 0, 0, /* replaced with address of .got + 4. */
5225 0x8b, 0x0d, /* movl contents of address, %ecx */
5226 0, 0, 0, 0, /* replaced with address of .got + 8. */
5227 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5228 0xff, 0xe1 /* jmp *%ecx */
5229 };
5230
5231 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5232 {
5233 0x8b, 0x0d, /* movl contents of address, %ecx */
5234 0, 0, 0, 0, /* replaced with GOT slot address. */
5235 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5236 0xff, 0xe1, /* jmp *%ecx */
5237
5238 /* Pad to the next 32-byte boundary with nop instructions. */
5239 0x90,
5240 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5241 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5242
5243 /* Lazy GOT entries point here (32-byte aligned). */
5244 0x68, /* pushl immediate */
5245 0, 0, 0, 0, /* replaced with reloc offset. */
5246 0xe9, /* jmp relative */
5247 0, 0, 0, 0, /* replaced with offset to .plt. */
5248
5249 /* Pad to the next 32-byte boundary with nop instructions. */
5250 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5251 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5252 0x90, 0x90
5253 };
5254
5255 static const bfd_byte
5256 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5257 {
5258 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5259 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5260 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5261 0xff, 0xe1, /* jmp *%ecx */
5262
5263 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5264 so pad to that size with nop instructions. */
5265 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5266 };
5267
5268 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5269 {
5270 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5271 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5272 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5273 0xff, 0xe1, /* jmp *%ecx */
5274
5275 /* Pad to the next 32-byte boundary with nop instructions. */
5276 0x90,
5277 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5278 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5279
5280 /* Lazy GOT entries point here (32-byte aligned). */
5281 0x68, /* pushl immediate */
5282 0, 0, 0, 0, /* replaced with offset into relocation table. */
5283 0xe9, /* jmp relative */
5284 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5285
5286 /* Pad to the next 32-byte boundary with nop instructions. */
5287 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5288 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5289 0x90, 0x90
5290 };
5291
5292 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5293 {
5294 #if (PLT_CIE_LENGTH != 20 \
5295 || PLT_FDE_LENGTH != 36 \
5296 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5297 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5298 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5299 #endif
5300 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5301 0, 0, 0, 0, /* CIE ID */
5302 1, /* CIE version */
5303 'z', 'R', 0, /* Augmentation string */
5304 1, /* Code alignment factor */
5305 0x7c, /* Data alignment factor: -4 */
5306 8, /* Return address column */
5307 1, /* Augmentation size */
5308 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5309 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5310 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5311 DW_CFA_nop, DW_CFA_nop,
5312
5313 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5314 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5315 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5316 0, 0, 0, 0, /* .plt size goes here */
5317 0, /* Augmentation size */
5318 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5319 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5320 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5321 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5322 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5323 13, /* Block length */
5324 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5325 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5326 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5327 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5328 DW_CFA_nop, DW_CFA_nop
5329 };
5330
5331 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5332 {
5333 elf_i386_nacl_plt0_entry, /* plt0_entry */
5334 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5335 2, /* plt0_got1_offset */
5336 8, /* plt0_got2_offset */
5337 elf_i386_nacl_plt_entry, /* plt_entry */
5338 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5339 2, /* plt_got_offset */
5340 33, /* plt_reloc_offset */
5341 38, /* plt_plt_offset */
5342 32, /* plt_lazy_offset */
5343 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5344 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5345 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5346 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5347 };
5348
5349 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5350 {
5351 &elf_i386_nacl_plt, /* plt */
5352 0x90, /* plt0_pad_byte: nop insn */
5353 0, /* is_vxworks */
5354 };
5355
5356 #undef elf_backend_arch_data
5357 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5358
5359 #undef elf_backend_modify_segment_map
5360 #define elf_backend_modify_segment_map nacl_modify_segment_map
5361 #undef elf_backend_modify_program_headers
5362 #define elf_backend_modify_program_headers nacl_modify_program_headers
5363
5364 #include "elf32-target.h"
5365
5366 /* Restore defaults. */
5367 #undef elf_backend_modify_segment_map
5368 #undef elf_backend_modify_program_headers
5369
5370 /* VxWorks support. */
5371
5372 #undef TARGET_LITTLE_SYM
5373 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5374 #undef TARGET_LITTLE_NAME
5375 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5376 #undef ELF_OSABI
5377 #undef elf_backend_plt_alignment
5378 #define elf_backend_plt_alignment 4
5379
5380 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5381 {
5382 &elf_i386_plt, /* plt */
5383 0x90, /* plt0_pad_byte */
5384 1, /* is_vxworks */
5385 };
5386
5387 #undef elf_backend_arch_data
5388 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5389
5390 #undef elf_backend_relocs_compatible
5391 #undef elf_backend_post_process_headers
5392 #undef elf_backend_add_symbol_hook
5393 #define elf_backend_add_symbol_hook \
5394 elf_vxworks_add_symbol_hook
5395 #undef elf_backend_link_output_symbol_hook
5396 #define elf_backend_link_output_symbol_hook \
5397 elf_vxworks_link_output_symbol_hook
5398 #undef elf_backend_emit_relocs
5399 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5400 #undef elf_backend_final_write_processing
5401 #define elf_backend_final_write_processing \
5402 elf_vxworks_final_write_processing
5403 #undef elf_backend_static_tls_alignment
5404
5405 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5406 define it. */
5407 #undef elf_backend_want_plt_sym
5408 #define elf_backend_want_plt_sym 1
5409
5410 #undef elf32_bed
5411 #define elf32_bed elf32_i386_vxworks_bed
5412
5413 #include "elf32-target.h"
GDB Binutils - Deliverables
This page took 0.189149 seconds and 5 git commands to generate.