projects / deliverable / binutils-gdb.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
bfd/
[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, no relocations or no output. */
2563 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2564 || sec->reloc_count == 0
2565 || discarded_section (sec))
2566 return TRUE;
2567
2568 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2569
2570 /* Load the relocations for this section. */
2571 internal_relocs = (_bfd_elf_link_read_relocs
2572 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2573 link_info->keep_memory));
2574 if (internal_relocs == NULL)
2575 return FALSE;
2576
2577 htab = elf_i386_hash_table (link_info);
2578 changed_contents = FALSE;
2579 changed_relocs = FALSE;
2580 local_got_refcounts = elf_local_got_refcounts (abfd);
2581
2582 /* Get the section contents. */
2583 if (elf_section_data (sec)->this_hdr.contents != NULL)
2584 contents = elf_section_data (sec)->this_hdr.contents;
2585 else
2586 {
2587 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2588 goto error_return;
2589 }
2590
2591 irelend = internal_relocs + sec->reloc_count;
2592 for (irel = internal_relocs; irel < irelend; irel++)
2593 {
2594 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2595 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2596 unsigned int indx;
2597 struct elf_link_hash_entry *h;
2598
2599 if (r_type != R_386_GOT32)
2600 continue;
2601
2602 /* Get the symbol referred to by the reloc. */
2603 if (r_symndx < symtab_hdr->sh_info)
2604 {
2605 Elf_Internal_Sym *isym;
2606
2607 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2608 abfd, r_symndx);
2609
2610 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2611 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2612 && bfd_get_8 (input_bfd,
2613 contents + irel->r_offset - 2) == 0x8b)
2614 {
2615 bfd_put_8 (output_bfd, 0x8d,
2616 contents + irel->r_offset - 2);
2617 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2618 if (local_got_refcounts != NULL
2619 && local_got_refcounts[r_symndx] > 0)
2620 local_got_refcounts[r_symndx] -= 1;
2621 changed_contents = TRUE;
2622 changed_relocs = TRUE;
2623 }
2624 continue;
2625 }
2626
2627 indx = r_symndx - symtab_hdr->sh_info;
2628 h = elf_sym_hashes (abfd)[indx];
2629 BFD_ASSERT (h != NULL);
2630
2631 while (h->root.type == bfd_link_hash_indirect
2632 || h->root.type == bfd_link_hash_warning)
2633 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2634
2635 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2636 optimizing _DYNAMIC since ld.so may use its link-time address. */
2637 if (h->def_regular
2638 && h->type != STT_GNU_IFUNC
2639 && h != htab->elf.hdynamic
2640 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2641 && bfd_get_8 (input_bfd,
2642 contents + irel->r_offset - 2) == 0x8b)
2643 {
2644 bfd_put_8 (output_bfd, 0x8d,
2645 contents + irel->r_offset - 2);
2646 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2647 if (h->got.refcount > 0)
2648 h->got.refcount -= 1;
2649 changed_contents = TRUE;
2650 changed_relocs = TRUE;
2651 }
2652 }
2653
2654 if (contents != NULL
2655 && elf_section_data (sec)->this_hdr.contents != contents)
2656 {
2657 if (!changed_contents && !link_info->keep_memory)
2658 free (contents);
2659 else
2660 {
2661 /* Cache the section contents for elf_link_input_bfd. */
2662 elf_section_data (sec)->this_hdr.contents = contents;
2663 }
2664 }
2665
2666 if (elf_section_data (sec)->relocs != internal_relocs)
2667 {
2668 if (!changed_relocs)
2669 free (internal_relocs);
2670 else
2671 elf_section_data (sec)->relocs = internal_relocs;
2672 }
2673
2674 return TRUE;
2675
2676 error_return:
2677 if (contents != NULL
2678 && elf_section_data (sec)->this_hdr.contents != contents)
2679 free (contents);
2680 if (internal_relocs != NULL
2681 && elf_section_data (sec)->relocs != internal_relocs)
2682 free (internal_relocs);
2683 return FALSE;
2684 }
2685
2686 /* Set the sizes of the dynamic sections. */
2687
2688 static bfd_boolean
2689 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2690 {
2691 struct elf_i386_link_hash_table *htab;
2692 bfd *dynobj;
2693 asection *s;
2694 bfd_boolean relocs;
2695 bfd *ibfd;
2696
2697 htab = elf_i386_hash_table (info);
2698 if (htab == NULL)
2699 return FALSE;
2700 dynobj = htab->elf.dynobj;
2701 if (dynobj == NULL)
2702 abort ();
2703
2704 if (htab->elf.dynamic_sections_created)
2705 {
2706 /* Set the contents of the .interp section to the interpreter. */
2707 if (info->executable)
2708 {
2709 s = bfd_get_linker_section (dynobj, ".interp");
2710 if (s == NULL)
2711 abort ();
2712 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2713 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2714 }
2715 }
2716
2717 /* Set up .got offsets for local syms, and space for local dynamic
2718 relocs. */
2719 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2720 {
2721 bfd_signed_vma *local_got;
2722 bfd_signed_vma *end_local_got;
2723 char *local_tls_type;
2724 bfd_vma *local_tlsdesc_gotent;
2725 bfd_size_type locsymcount;
2726 Elf_Internal_Shdr *symtab_hdr;
2727 asection *srel;
2728
2729 if (! is_i386_elf (ibfd))
2730 continue;
2731
2732 for (s = ibfd->sections; s != NULL; s = s->next)
2733 {
2734 struct elf_dyn_relocs *p;
2735
2736 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2737 return FALSE;
2738
2739 for (p = ((struct elf_dyn_relocs *)
2740 elf_section_data (s)->local_dynrel);
2741 p != NULL;
2742 p = p->next)
2743 {
2744 if (!bfd_is_abs_section (p->sec)
2745 && bfd_is_abs_section (p->sec->output_section))
2746 {
2747 /* Input section has been discarded, either because
2748 it is a copy of a linkonce section or due to
2749 linker script /DISCARD/, so we'll be discarding
2750 the relocs too. */
2751 }
2752 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2753 && strcmp (p->sec->output_section->name,
2754 ".tls_vars") == 0)
2755 {
2756 /* Relocations in vxworks .tls_vars sections are
2757 handled specially by the loader. */
2758 }
2759 else if (p->count != 0)
2760 {
2761 srel = elf_section_data (p->sec)->sreloc;
2762 srel->size += p->count * sizeof (Elf32_External_Rel);
2763 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2764 && (info->flags & DF_TEXTREL) == 0)
2765 {
2766 info->flags |= DF_TEXTREL;
2767 if (info->warn_shared_textrel && info->shared)
2768 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2769 p->sec->owner, p->sec);
2770 }
2771 }
2772 }
2773 }
2774
2775 local_got = elf_local_got_refcounts (ibfd);
2776 if (!local_got)
2777 continue;
2778
2779 symtab_hdr = &elf_symtab_hdr (ibfd);
2780 locsymcount = symtab_hdr->sh_info;
2781 end_local_got = local_got + locsymcount;
2782 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2783 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2784 s = htab->elf.sgot;
2785 srel = htab->elf.srelgot;
2786 for (; local_got < end_local_got;
2787 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2788 {
2789 *local_tlsdesc_gotent = (bfd_vma) -1;
2790 if (*local_got > 0)
2791 {
2792 if (GOT_TLS_GDESC_P (*local_tls_type))
2793 {
2794 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2795 - elf_i386_compute_jump_table_size (htab);
2796 htab->elf.sgotplt->size += 8;
2797 *local_got = (bfd_vma) -2;
2798 }
2799 if (! GOT_TLS_GDESC_P (*local_tls_type)
2800 || GOT_TLS_GD_P (*local_tls_type))
2801 {
2802 *local_got = s->size;
2803 s->size += 4;
2804 if (GOT_TLS_GD_P (*local_tls_type)
2805 || *local_tls_type == GOT_TLS_IE_BOTH)
2806 s->size += 4;
2807 }
2808 if (info->shared
2809 || GOT_TLS_GD_ANY_P (*local_tls_type)
2810 || (*local_tls_type & GOT_TLS_IE))
2811 {
2812 if (*local_tls_type == GOT_TLS_IE_BOTH)
2813 srel->size += 2 * sizeof (Elf32_External_Rel);
2814 else if (GOT_TLS_GD_P (*local_tls_type)
2815 || ! GOT_TLS_GDESC_P (*local_tls_type))
2816 srel->size += sizeof (Elf32_External_Rel);
2817 if (GOT_TLS_GDESC_P (*local_tls_type))
2818 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2819 }
2820 }
2821 else
2822 *local_got = (bfd_vma) -1;
2823 }
2824 }
2825
2826 if (htab->tls_ldm_got.refcount > 0)
2827 {
2828 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2829 relocs. */
2830 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2831 htab->elf.sgot->size += 8;
2832 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2833 }
2834 else
2835 htab->tls_ldm_got.offset = -1;
2836
2837 /* Allocate global sym .plt and .got entries, and space for global
2838 sym dynamic relocs. */
2839 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2840
2841 /* Allocate .plt and .got entries, and space for local symbols. */
2842 htab_traverse (htab->loc_hash_table,
2843 elf_i386_allocate_local_dynrelocs,
2844 info);
2845
2846 /* For every jump slot reserved in the sgotplt, reloc_count is
2847 incremented. However, when we reserve space for TLS descriptors,
2848 it's not incremented, so in order to compute the space reserved
2849 for them, it suffices to multiply the reloc count by the jump
2850 slot size.
2851
2852 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2853 so that R_386_IRELATIVE entries come last. */
2854 if (htab->elf.srelplt)
2855 {
2856 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2857 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2858 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2859 }
2860 else if (htab->elf.irelplt)
2861 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2862
2863
2864 if (htab->elf.sgotplt)
2865 {
2866 /* Don't allocate .got.plt section if there are no GOT nor PLT
2867 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2868 if ((htab->elf.hgot == NULL
2869 || !htab->elf.hgot->ref_regular_nonweak)
2870 && (htab->elf.sgotplt->size
2871 == get_elf_backend_data (output_bfd)->got_header_size)
2872 && (htab->elf.splt == NULL
2873 || htab->elf.splt->size == 0)
2874 && (htab->elf.sgot == NULL
2875 || htab->elf.sgot->size == 0)
2876 && (htab->elf.iplt == NULL
2877 || htab->elf.iplt->size == 0)
2878 && (htab->elf.igotplt == NULL
2879 || htab->elf.igotplt->size == 0))
2880 htab->elf.sgotplt->size = 0;
2881 }
2882
2883
2884 if (htab->plt_eh_frame != NULL
2885 && htab->elf.splt != NULL
2886 && htab->elf.splt->size != 0
2887 && !bfd_is_abs_section (htab->elf.splt->output_section)
2888 && _bfd_elf_eh_frame_present (info))
2889 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2890
2891 /* We now have determined the sizes of the various dynamic sections.
2892 Allocate memory for them. */
2893 relocs = FALSE;
2894 for (s = dynobj->sections; s != NULL; s = s->next)
2895 {
2896 bfd_boolean strip_section = TRUE;
2897
2898 if ((s->flags & SEC_LINKER_CREATED) == 0)
2899 continue;
2900
2901 if (s == htab->elf.splt
2902 || s == htab->elf.sgot)
2903 {
2904 /* Strip this section if we don't need it; see the
2905 comment below. */
2906 /* We'd like to strip these sections if they aren't needed, but if
2907 we've exported dynamic symbols from them we must leave them.
2908 It's too late to tell BFD to get rid of the symbols. */
2909
2910 if (htab->elf.hplt != NULL)
2911 strip_section = FALSE;
2912 }
2913 else if (s == htab->elf.sgotplt
2914 || s == htab->elf.iplt
2915 || s == htab->elf.igotplt
2916 || s == htab->plt_eh_frame
2917 || s == htab->sdynbss)
2918 {
2919 /* Strip these too. */
2920 }
2921 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2922 {
2923 if (s->size != 0
2924 && s != htab->elf.srelplt
2925 && s != htab->srelplt2)
2926 relocs = TRUE;
2927
2928 /* We use the reloc_count field as a counter if we need
2929 to copy relocs into the output file. */
2930 s->reloc_count = 0;
2931 }
2932 else
2933 {
2934 /* It's not one of our sections, so don't allocate space. */
2935 continue;
2936 }
2937
2938 if (s->size == 0)
2939 {
2940 /* If we don't need this section, strip it from the
2941 output file. This is mostly to handle .rel.bss and
2942 .rel.plt. We must create both sections in
2943 create_dynamic_sections, because they must be created
2944 before the linker maps input sections to output
2945 sections. The linker does that before
2946 adjust_dynamic_symbol is called, and it is that
2947 function which decides whether anything needs to go
2948 into these sections. */
2949 if (strip_section)
2950 s->flags |= SEC_EXCLUDE;
2951 continue;
2952 }
2953
2954 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2955 continue;
2956
2957 /* Allocate memory for the section contents. We use bfd_zalloc
2958 here in case unused entries are not reclaimed before the
2959 section's contents are written out. This should not happen,
2960 but this way if it does, we get a R_386_NONE reloc instead
2961 of garbage. */
2962 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2963 if (s->contents == NULL)
2964 return FALSE;
2965 }
2966
2967 if (htab->plt_eh_frame != NULL
2968 && htab->plt_eh_frame->contents != NULL)
2969 {
2970 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2971 sizeof (elf_i386_eh_frame_plt));
2972 bfd_put_32 (dynobj, htab->elf.splt->size,
2973 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2974 }
2975
2976 if (htab->elf.dynamic_sections_created)
2977 {
2978 /* Add some entries to the .dynamic section. We fill in the
2979 values later, in elf_i386_finish_dynamic_sections, but we
2980 must add the entries now so that we get the correct size for
2981 the .dynamic section. The DT_DEBUG entry is filled in by the
2982 dynamic linker and used by the debugger. */
2983 #define add_dynamic_entry(TAG, VAL) \
2984 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2985
2986 if (info->executable)
2987 {
2988 if (!add_dynamic_entry (DT_DEBUG, 0))
2989 return FALSE;
2990 }
2991
2992 if (htab->elf.splt->size != 0)
2993 {
2994 if (!add_dynamic_entry (DT_PLTGOT, 0)
2995 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2996 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2997 || !add_dynamic_entry (DT_JMPREL, 0))
2998 return FALSE;
2999 }
3000
3001 if (relocs)
3002 {
3003 if (!add_dynamic_entry (DT_REL, 0)
3004 || !add_dynamic_entry (DT_RELSZ, 0)
3005 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3006 return FALSE;
3007
3008 /* If any dynamic relocs apply to a read-only section,
3009 then we need a DT_TEXTREL entry. */
3010 if ((info->flags & DF_TEXTREL) == 0)
3011 elf_link_hash_traverse (&htab->elf,
3012 elf_i386_readonly_dynrelocs, info);
3013
3014 if ((info->flags & DF_TEXTREL) != 0)
3015 {
3016 if (!add_dynamic_entry (DT_TEXTREL, 0))
3017 return FALSE;
3018 }
3019 }
3020 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3021 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3022 return FALSE;
3023 }
3024 #undef add_dynamic_entry
3025
3026 return TRUE;
3027 }
3028
3029 static bfd_boolean
3030 elf_i386_always_size_sections (bfd *output_bfd,
3031 struct bfd_link_info *info)
3032 {
3033 asection *tls_sec = elf_hash_table (info)->tls_sec;
3034
3035 if (tls_sec)
3036 {
3037 struct elf_link_hash_entry *tlsbase;
3038
3039 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3040 "_TLS_MODULE_BASE_",
3041 FALSE, FALSE, FALSE);
3042
3043 if (tlsbase && tlsbase->type == STT_TLS)
3044 {
3045 struct elf_i386_link_hash_table *htab;
3046 struct bfd_link_hash_entry *bh = NULL;
3047 const struct elf_backend_data *bed
3048 = get_elf_backend_data (output_bfd);
3049
3050 htab = elf_i386_hash_table (info);
3051 if (htab == NULL)
3052 return FALSE;
3053
3054 if (!(_bfd_generic_link_add_one_symbol
3055 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3056 tls_sec, 0, NULL, FALSE,
3057 bed->collect, &bh)))
3058 return FALSE;
3059
3060 htab->tls_module_base = bh;
3061
3062 tlsbase = (struct elf_link_hash_entry *)bh;
3063 tlsbase->def_regular = 1;
3064 tlsbase->other = STV_HIDDEN;
3065 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3066 }
3067 }
3068
3069 return TRUE;
3070 }
3071
3072 /* Set the correct type for an x86 ELF section. We do this by the
3073 section name, which is a hack, but ought to work. */
3074
3075 static bfd_boolean
3076 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3077 Elf_Internal_Shdr *hdr,
3078 asection *sec)
3079 {
3080 const char *name;
3081
3082 name = bfd_get_section_name (abfd, sec);
3083
3084 /* This is an ugly, but unfortunately necessary hack that is
3085 needed when producing EFI binaries on x86. It tells
3086 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3087 containing ELF relocation info. We need this hack in order to
3088 be able to generate ELF binaries that can be translated into
3089 EFI applications (which are essentially COFF objects). Those
3090 files contain a COFF ".reloc" section inside an ELFNN object,
3091 which would normally cause BFD to segfault because it would
3092 attempt to interpret this section as containing relocation
3093 entries for section "oc". With this hack enabled, ".reloc"
3094 will be treated as a normal data section, which will avoid the
3095 segfault. However, you won't be able to create an ELFNN binary
3096 with a section named "oc" that needs relocations, but that's
3097 the kind of ugly side-effects you get when detecting section
3098 types based on their names... In practice, this limitation is
3099 unlikely to bite. */
3100 if (strcmp (name, ".reloc") == 0)
3101 hdr->sh_type = SHT_PROGBITS;
3102
3103 return TRUE;
3104 }
3105
3106 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3107 executables. Rather than setting it to the beginning of the TLS
3108 section, we have to set it to the end. This function may be called
3109 multiple times, it is idempotent. */
3110
3111 static void
3112 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3113 {
3114 struct elf_i386_link_hash_table *htab;
3115 struct bfd_link_hash_entry *base;
3116
3117 if (!info->executable)
3118 return;
3119
3120 htab = elf_i386_hash_table (info);
3121 if (htab == NULL)
3122 return;
3123
3124 base = htab->tls_module_base;
3125 if (base == NULL)
3126 return;
3127
3128 base->u.def.value = htab->elf.tls_size;
3129 }
3130
3131 /* Return the base VMA address which should be subtracted from real addresses
3132 when resolving @dtpoff relocation.
3133 This is PT_TLS segment p_vaddr. */
3134
3135 static bfd_vma
3136 elf_i386_dtpoff_base (struct bfd_link_info *info)
3137 {
3138 /* If tls_sec is NULL, we should have signalled an error already. */
3139 if (elf_hash_table (info)->tls_sec == NULL)
3140 return 0;
3141 return elf_hash_table (info)->tls_sec->vma;
3142 }
3143
3144 /* Return the relocation value for @tpoff relocation
3145 if STT_TLS virtual address is ADDRESS. */
3146
3147 static bfd_vma
3148 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3149 {
3150 struct elf_link_hash_table *htab = elf_hash_table (info);
3151 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3152 bfd_vma static_tls_size;
3153
3154 /* If tls_sec is NULL, we should have signalled an error already. */
3155 if (htab->tls_sec == NULL)
3156 return 0;
3157
3158 /* Consider special static TLS alignment requirements. */
3159 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3160 return static_tls_size + htab->tls_sec->vma - address;
3161 }
3162
3163 /* Relocate an i386 ELF section. */
3164
3165 static bfd_boolean
3166 elf_i386_relocate_section (bfd *output_bfd,
3167 struct bfd_link_info *info,
3168 bfd *input_bfd,
3169 asection *input_section,
3170 bfd_byte *contents,
3171 Elf_Internal_Rela *relocs,
3172 Elf_Internal_Sym *local_syms,
3173 asection **local_sections)
3174 {
3175 struct elf_i386_link_hash_table *htab;
3176 Elf_Internal_Shdr *symtab_hdr;
3177 struct elf_link_hash_entry **sym_hashes;
3178 bfd_vma *local_got_offsets;
3179 bfd_vma *local_tlsdesc_gotents;
3180 Elf_Internal_Rela *rel;
3181 Elf_Internal_Rela *relend;
3182 bfd_boolean is_vxworks_tls;
3183 unsigned plt_entry_size;
3184
3185 BFD_ASSERT (is_i386_elf (input_bfd));
3186
3187 htab = elf_i386_hash_table (info);
3188 if (htab == NULL)
3189 return FALSE;
3190 symtab_hdr = &elf_symtab_hdr (input_bfd);
3191 sym_hashes = elf_sym_hashes (input_bfd);
3192 local_got_offsets = elf_local_got_offsets (input_bfd);
3193 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3194 /* We have to handle relocations in vxworks .tls_vars sections
3195 specially, because the dynamic loader is 'weird'. */
3196 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3197 && info->shared
3198 && !strcmp (input_section->output_section->name,
3199 ".tls_vars"));
3200
3201 elf_i386_set_tls_module_base (info);
3202
3203 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3204
3205 rel = relocs;
3206 relend = relocs + input_section->reloc_count;
3207 for (; rel < relend; rel++)
3208 {
3209 unsigned int r_type;
3210 reloc_howto_type *howto;
3211 unsigned long r_symndx;
3212 struct elf_link_hash_entry *h;
3213 Elf_Internal_Sym *sym;
3214 asection *sec;
3215 bfd_vma off, offplt;
3216 bfd_vma relocation;
3217 bfd_boolean unresolved_reloc;
3218 bfd_reloc_status_type r;
3219 unsigned int indx;
3220 int tls_type;
3221
3222 r_type = ELF32_R_TYPE (rel->r_info);
3223 if (r_type == R_386_GNU_VTINHERIT
3224 || r_type == R_386_GNU_VTENTRY)
3225 continue;
3226
3227 if ((indx = r_type) >= R_386_standard
3228 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3229 >= R_386_ext - R_386_standard)
3230 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3231 >= R_386_irelative - R_386_ext))
3232 {
3233 (*_bfd_error_handler)
3234 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3235 input_bfd, input_section, r_type);
3236 bfd_set_error (bfd_error_bad_value);
3237 return FALSE;
3238 }
3239 howto = elf_howto_table + indx;
3240
3241 r_symndx = ELF32_R_SYM (rel->r_info);
3242 h = NULL;
3243 sym = NULL;
3244 sec = NULL;
3245 unresolved_reloc = FALSE;
3246 if (r_symndx < symtab_hdr->sh_info)
3247 {
3248 sym = local_syms + r_symndx;
3249 sec = local_sections[r_symndx];
3250 relocation = (sec->output_section->vma
3251 + sec->output_offset
3252 + sym->st_value);
3253
3254 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3255 && ((sec->flags & SEC_MERGE) != 0
3256 || (info->relocatable
3257 && sec->output_offset != 0)))
3258 {
3259 bfd_vma addend;
3260 bfd_byte *where = contents + rel->r_offset;
3261
3262 switch (howto->size)
3263 {
3264 case 0:
3265 addend = bfd_get_8 (input_bfd, where);
3266 if (howto->pc_relative)
3267 {
3268 addend = (addend ^ 0x80) - 0x80;
3269 addend += 1;
3270 }
3271 break;
3272 case 1:
3273 addend = bfd_get_16 (input_bfd, where);
3274 if (howto->pc_relative)
3275 {
3276 addend = (addend ^ 0x8000) - 0x8000;
3277 addend += 2;
3278 }
3279 break;
3280 case 2:
3281 addend = bfd_get_32 (input_bfd, where);
3282 if (howto->pc_relative)
3283 {
3284 addend = (addend ^ 0x80000000) - 0x80000000;
3285 addend += 4;
3286 }
3287 break;
3288 default:
3289 abort ();
3290 }
3291
3292 if (info->relocatable)
3293 addend += sec->output_offset;
3294 else
3295 {
3296 asection *msec = sec;
3297 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3298 addend);
3299 addend -= relocation;
3300 addend += msec->output_section->vma + msec->output_offset;
3301 }
3302
3303 switch (howto->size)
3304 {
3305 case 0:
3306 /* FIXME: overflow checks. */
3307 if (howto->pc_relative)
3308 addend -= 1;
3309 bfd_put_8 (input_bfd, addend, where);
3310 break;
3311 case 1:
3312 if (howto->pc_relative)
3313 addend -= 2;
3314 bfd_put_16 (input_bfd, addend, where);
3315 break;
3316 case 2:
3317 if (howto->pc_relative)
3318 addend -= 4;
3319 bfd_put_32 (input_bfd, addend, where);
3320 break;
3321 }
3322 }
3323 else if (!info->relocatable
3324 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3325 {
3326 /* Relocate against local STT_GNU_IFUNC symbol. */
3327 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3328 FALSE);
3329 if (h == NULL)
3330 abort ();
3331
3332 /* Set STT_GNU_IFUNC symbol value. */
3333 h->root.u.def.value = sym->st_value;
3334 h->root.u.def.section = sec;
3335 }
3336 }
3337 else
3338 {
3339 bfd_boolean warned ATTRIBUTE_UNUSED;
3340
3341 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3342 r_symndx, symtab_hdr, sym_hashes,
3343 h, sec, relocation,
3344 unresolved_reloc, warned);
3345 }
3346
3347 if (sec != NULL && discarded_section (sec))
3348 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3349 rel, 1, relend, howto, 0, contents);
3350
3351 if (info->relocatable)
3352 continue;
3353
3354 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3355 it here if it is defined in a non-shared object. */
3356 if (h != NULL
3357 && h->type == STT_GNU_IFUNC
3358 && h->def_regular)
3359 {
3360 asection *plt, *gotplt, *base_got;
3361 bfd_vma plt_index;
3362 const char *name;
3363
3364 if ((input_section->flags & SEC_ALLOC) == 0
3365 || h->plt.offset == (bfd_vma) -1)
3366 abort ();
3367
3368 /* STT_GNU_IFUNC symbol must go through PLT. */
3369 if (htab->elf.splt != NULL)
3370 {
3371 plt = htab->elf.splt;
3372 gotplt = htab->elf.sgotplt;
3373 }
3374 else
3375 {
3376 plt = htab->elf.iplt;
3377 gotplt = htab->elf.igotplt;
3378 }
3379
3380 relocation = (plt->output_section->vma
3381 + plt->output_offset + h->plt.offset);
3382
3383 switch (r_type)
3384 {
3385 default:
3386 if (h->root.root.string)
3387 name = h->root.root.string;
3388 else
3389 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3390 NULL);
3391 (*_bfd_error_handler)
3392 (_("%B: relocation %s against STT_GNU_IFUNC "
3393 "symbol `%s' isn't handled by %s"), input_bfd,
3394 elf_howto_table[r_type].name,
3395 name, __FUNCTION__);
3396 bfd_set_error (bfd_error_bad_value);
3397 return FALSE;
3398
3399 case R_386_32:
3400 /* Generate dynamic relcoation only when there is a
3401 non-GOT reference in a shared object. */
3402 if (info->shared && h->non_got_ref)
3403 {
3404 Elf_Internal_Rela outrel;
3405 bfd_byte *loc;
3406 asection *sreloc;
3407 bfd_vma offset;
3408
3409 /* Need a dynamic relocation to get the real function
3410 adddress. */
3411 offset = _bfd_elf_section_offset (output_bfd,
3412 info,
3413 input_section,
3414 rel->r_offset);
3415 if (offset == (bfd_vma) -1
3416 || offset == (bfd_vma) -2)
3417 abort ();
3418
3419 outrel.r_offset = (input_section->output_section->vma
3420 + input_section->output_offset
3421 + offset);
3422
3423 if (h->dynindx == -1
3424 || h->forced_local
3425 || info->executable)
3426 {
3427 /* This symbol is resolved locally. */
3428 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3429 bfd_put_32 (output_bfd,
3430 (h->root.u.def.value
3431 + h->root.u.def.section->output_section->vma
3432 + h->root.u.def.section->output_offset),
3433 contents + offset);
3434 }
3435 else
3436 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3437
3438 sreloc = htab->elf.irelifunc;
3439 loc = sreloc->contents;
3440 loc += (sreloc->reloc_count++
3441 * sizeof (Elf32_External_Rel));
3442 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3443
3444 /* If this reloc is against an external symbol, we
3445 do not want to fiddle with the addend. Otherwise,
3446 we need to include the symbol value so that it
3447 becomes an addend for the dynamic reloc. For an
3448 internal symbol, we have updated addend. */
3449 continue;
3450 }
3451 /* FALLTHROUGH */
3452 case R_386_PC32:
3453 case R_386_PLT32:
3454 goto do_relocation;
3455
3456 case R_386_GOT32:
3457 base_got = htab->elf.sgot;
3458 off = h->got.offset;
3459
3460 if (base_got == NULL)
3461 abort ();
3462
3463 if (off == (bfd_vma) -1)
3464 {
3465 /* We can't use h->got.offset here to save state, or
3466 even just remember the offset, as finish_dynamic_symbol
3467 would use that as offset into .got. */
3468
3469 if (htab->elf.splt != NULL)
3470 {
3471 plt_index = h->plt.offset / plt_entry_size - 1;
3472 off = (plt_index + 3) * 4;
3473 base_got = htab->elf.sgotplt;
3474 }
3475 else
3476 {
3477 plt_index = h->plt.offset / plt_entry_size;
3478 off = plt_index * 4;
3479 base_got = htab->elf.igotplt;
3480 }
3481
3482 if (h->dynindx == -1
3483 || h->forced_local
3484 || info->symbolic)
3485 {
3486 /* This references the local defitionion. We must
3487 initialize this entry in the global offset table.
3488 Since the offset must always be a multiple of 8,
3489 we use the least significant bit to record
3490 whether we have initialized it already.
3491
3492 When doing a dynamic link, we create a .rela.got
3493 relocation entry to initialize the value. This
3494 is done in the finish_dynamic_symbol routine. */
3495 if ((off & 1) != 0)
3496 off &= ~1;
3497 else
3498 {
3499 bfd_put_32 (output_bfd, relocation,
3500 base_got->contents + off);
3501 h->got.offset |= 1;
3502 }
3503 }
3504
3505 relocation = off;
3506
3507 /* Adjust for static executables. */
3508 if (htab->elf.splt == NULL)
3509 relocation += gotplt->output_offset;
3510 }
3511 else
3512 {
3513 relocation = (base_got->output_section->vma
3514 + base_got->output_offset + off
3515 - gotplt->output_section->vma
3516 - gotplt->output_offset);
3517 /* Adjust for static executables. */
3518 if (htab->elf.splt == NULL)
3519 relocation += gotplt->output_offset;
3520 }
3521
3522 goto do_relocation;
3523
3524 case R_386_GOTOFF:
3525 relocation -= (gotplt->output_section->vma
3526 + gotplt->output_offset);
3527 goto do_relocation;
3528 }
3529 }
3530
3531 switch (r_type)
3532 {
3533 case R_386_GOT32:
3534 /* Relocation is to the entry for this symbol in the global
3535 offset table. */
3536 if (htab->elf.sgot == NULL)
3537 abort ();
3538
3539 if (h != NULL)
3540 {
3541 bfd_boolean dyn;
3542
3543 off = h->got.offset;
3544 dyn = htab->elf.dynamic_sections_created;
3545 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3546 || (info->shared
3547 && SYMBOL_REFERENCES_LOCAL (info, h))
3548 || (ELF_ST_VISIBILITY (h->other)
3549 && h->root.type == bfd_link_hash_undefweak))
3550 {
3551 /* This is actually a static link, or it is a
3552 -Bsymbolic link and the symbol is defined
3553 locally, or the symbol was forced to be local
3554 because of a version file. We must initialize
3555 this entry in the global offset table. Since the
3556 offset must always be a multiple of 4, we use the
3557 least significant bit to record whether we have
3558 initialized it already.
3559
3560 When doing a dynamic link, we create a .rel.got
3561 relocation entry to initialize the value. This
3562 is done in the finish_dynamic_symbol routine. */
3563 if ((off & 1) != 0)
3564 off &= ~1;
3565 else
3566 {
3567 bfd_put_32 (output_bfd, relocation,
3568 htab->elf.sgot->contents + off);
3569 h->got.offset |= 1;
3570 }
3571 }
3572 else
3573 unresolved_reloc = FALSE;
3574 }
3575 else
3576 {
3577 if (local_got_offsets == NULL)
3578 abort ();
3579
3580 off = local_got_offsets[r_symndx];
3581
3582 /* The offset must always be a multiple of 4. We use
3583 the least significant bit to record whether we have
3584 already generated the necessary reloc. */
3585 if ((off & 1) != 0)
3586 off &= ~1;
3587 else
3588 {
3589 bfd_put_32 (output_bfd, relocation,
3590 htab->elf.sgot->contents + off);
3591
3592 if (info->shared)
3593 {
3594 asection *s;
3595 Elf_Internal_Rela outrel;
3596 bfd_byte *loc;
3597
3598 s = htab->elf.srelgot;
3599 if (s == NULL)
3600 abort ();
3601
3602 outrel.r_offset = (htab->elf.sgot->output_section->vma
3603 + htab->elf.sgot->output_offset
3604 + off);
3605 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3606 loc = s->contents;
3607 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3608 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3609 }
3610
3611 local_got_offsets[r_symndx] |= 1;
3612 }
3613 }
3614
3615 if (off >= (bfd_vma) -2)
3616 abort ();
3617
3618 relocation = htab->elf.sgot->output_section->vma
3619 + htab->elf.sgot->output_offset + off
3620 - htab->elf.sgotplt->output_section->vma
3621 - htab->elf.sgotplt->output_offset;
3622 break;
3623
3624 case R_386_GOTOFF:
3625 /* Relocation is relative to the start of the global offset
3626 table. */
3627
3628 /* Check to make sure it isn't a protected function symbol
3629 for shared library since it may not be local when used
3630 as function address. We also need to make sure that a
3631 symbol is defined locally. */
3632 if (info->shared && h)
3633 {
3634 if (!h->def_regular)
3635 {
3636 const char *v;
3637
3638 switch (ELF_ST_VISIBILITY (h->other))
3639 {
3640 case STV_HIDDEN:
3641 v = _("hidden symbol");
3642 break;
3643 case STV_INTERNAL:
3644 v = _("internal symbol");
3645 break;
3646 case STV_PROTECTED:
3647 v = _("protected symbol");
3648 break;
3649 default:
3650 v = _("symbol");
3651 break;
3652 }
3653
3654 (*_bfd_error_handler)
3655 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3656 input_bfd, v, h->root.root.string);
3657 bfd_set_error (bfd_error_bad_value);
3658 return FALSE;
3659 }
3660 else if (!info->executable
3661 && !SYMBOLIC_BIND (info, h)
3662 && h->type == STT_FUNC
3663 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3664 {
3665 (*_bfd_error_handler)
3666 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3667 input_bfd, h->root.root.string);
3668 bfd_set_error (bfd_error_bad_value);
3669 return FALSE;
3670 }
3671 }
3672
3673 /* Note that sgot is not involved in this
3674 calculation. We always want the start of .got.plt. If we
3675 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3676 permitted by the ABI, we might have to change this
3677 calculation. */
3678 relocation -= htab->elf.sgotplt->output_section->vma
3679 + htab->elf.sgotplt->output_offset;
3680 break;
3681
3682 case R_386_GOTPC:
3683 /* Use global offset table as symbol value. */
3684 relocation = htab->elf.sgotplt->output_section->vma
3685 + htab->elf.sgotplt->output_offset;
3686 unresolved_reloc = FALSE;
3687 break;
3688
3689 case R_386_PLT32:
3690 /* Relocation is to the entry for this symbol in the
3691 procedure linkage table. */
3692
3693 /* Resolve a PLT32 reloc against a local symbol directly,
3694 without using the procedure linkage table. */
3695 if (h == NULL)
3696 break;
3697
3698 if (h->plt.offset == (bfd_vma) -1
3699 || htab->elf.splt == NULL)
3700 {
3701 /* We didn't make a PLT entry for this symbol. This
3702 happens when statically linking PIC code, or when
3703 using -Bsymbolic. */
3704 break;
3705 }
3706
3707 relocation = (htab->elf.splt->output_section->vma
3708 + htab->elf.splt->output_offset
3709 + h->plt.offset);
3710 unresolved_reloc = FALSE;
3711 break;
3712
3713 case R_386_32:
3714 case R_386_PC32:
3715 if ((input_section->flags & SEC_ALLOC) == 0
3716 || is_vxworks_tls)
3717 break;
3718
3719 if ((info->shared
3720 && (h == NULL
3721 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3722 || h->root.type != bfd_link_hash_undefweak)
3723 && (r_type != R_386_PC32
3724 || !SYMBOL_CALLS_LOCAL (info, h)))
3725 || (ELIMINATE_COPY_RELOCS
3726 && !info->shared
3727 && h != NULL
3728 && h->dynindx != -1
3729 && !h->non_got_ref
3730 && ((h->def_dynamic
3731 && !h->def_regular)
3732 || h->root.type == bfd_link_hash_undefweak
3733 || h->root.type == bfd_link_hash_undefined)))
3734 {
3735 Elf_Internal_Rela outrel;
3736 bfd_byte *loc;
3737 bfd_boolean skip, relocate;
3738 asection *sreloc;
3739
3740 /* When generating a shared object, these relocations
3741 are copied into the output file to be resolved at run
3742 time. */
3743
3744 skip = FALSE;
3745 relocate = FALSE;
3746
3747 outrel.r_offset =
3748 _bfd_elf_section_offset (output_bfd, info, input_section,
3749 rel->r_offset);
3750 if (outrel.r_offset == (bfd_vma) -1)
3751 skip = TRUE;
3752 else if (outrel.r_offset == (bfd_vma) -2)
3753 skip = TRUE, relocate = TRUE;
3754 outrel.r_offset += (input_section->output_section->vma
3755 + input_section->output_offset);
3756
3757 if (skip)
3758 memset (&outrel, 0, sizeof outrel);
3759 else if (h != NULL
3760 && h->dynindx != -1
3761 && (r_type == R_386_PC32
3762 || !info->shared
3763 || !SYMBOLIC_BIND (info, h)
3764 || !h->def_regular))
3765 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3766 else
3767 {
3768 /* This symbol is local, or marked to become local. */
3769 relocate = TRUE;
3770 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3771 }
3772
3773 sreloc = elf_section_data (input_section)->sreloc;
3774
3775 if (sreloc == NULL || sreloc->contents == NULL)
3776 {
3777 r = bfd_reloc_notsupported;
3778 goto check_relocation_error;
3779 }
3780
3781 loc = sreloc->contents;
3782 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3783
3784 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3785
3786 /* If this reloc is against an external symbol, we do
3787 not want to fiddle with the addend. Otherwise, we
3788 need to include the symbol value so that it becomes
3789 an addend for the dynamic reloc. */
3790 if (! relocate)
3791 continue;
3792 }
3793 break;
3794
3795 case R_386_TLS_IE:
3796 if (!info->executable)
3797 {
3798 Elf_Internal_Rela outrel;
3799 bfd_byte *loc;
3800 asection *sreloc;
3801
3802 outrel.r_offset = rel->r_offset
3803 + input_section->output_section->vma
3804 + input_section->output_offset;
3805 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3806 sreloc = elf_section_data (input_section)->sreloc;
3807 if (sreloc == NULL)
3808 abort ();
3809 loc = sreloc->contents;
3810 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3811 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3812 }
3813 /* Fall through */
3814
3815 case R_386_TLS_GD:
3816 case R_386_TLS_GOTDESC:
3817 case R_386_TLS_DESC_CALL:
3818 case R_386_TLS_IE_32:
3819 case R_386_TLS_GOTIE:
3820 tls_type = GOT_UNKNOWN;
3821 if (h == NULL && local_got_offsets)
3822 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3823 else if (h != NULL)
3824 tls_type = elf_i386_hash_entry(h)->tls_type;
3825 if (tls_type == GOT_TLS_IE)
3826 tls_type = GOT_TLS_IE_NEG;
3827
3828 if (! elf_i386_tls_transition (info, input_bfd,
3829 input_section, contents,
3830 symtab_hdr, sym_hashes,
3831 &r_type, tls_type, rel,
3832 relend, h, r_symndx))
3833 return FALSE;
3834
3835 if (r_type == R_386_TLS_LE_32)
3836 {
3837 BFD_ASSERT (! unresolved_reloc);
3838 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3839 {
3840 unsigned int type;
3841 bfd_vma roff;
3842
3843 /* GD->LE transition. */
3844 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3845 if (type == 0x04)
3846 {
3847 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3848 Change it into:
3849 movl %gs:0, %eax; subl $foo@tpoff, %eax
3850 (6 byte form of subl). */
3851 memcpy (contents + rel->r_offset - 3,
3852 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3853 roff = rel->r_offset + 5;
3854 }
3855 else
3856 {
3857 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3858 Change it into:
3859 movl %gs:0, %eax; subl $foo@tpoff, %eax
3860 (6 byte form of subl). */
3861 memcpy (contents + rel->r_offset - 2,
3862 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3863 roff = rel->r_offset + 6;
3864 }
3865 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3866 contents + roff);
3867 /* Skip R_386_PC32/R_386_PLT32. */
3868 rel++;
3869 continue;
3870 }
3871 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3872 {
3873 /* GDesc -> LE transition.
3874 It's originally something like:
3875 leal x@tlsdesc(%ebx), %eax
3876
3877 leal x@ntpoff, %eax
3878
3879 Registers other than %eax may be set up here. */
3880
3881 unsigned int val;
3882 bfd_vma roff;
3883
3884 roff = rel->r_offset;
3885 val = bfd_get_8 (input_bfd, contents + roff - 1);
3886
3887 /* Now modify the instruction as appropriate. */
3888 /* aoliva FIXME: remove the above and xor the byte
3889 below with 0x86. */
3890 bfd_put_8 (output_bfd, val ^ 0x86,
3891 contents + roff - 1);
3892 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3893 contents + roff);
3894 continue;
3895 }
3896 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3897 {
3898 /* GDesc -> LE transition.
3899 It's originally:
3900 call *(%eax)
3901 Turn it into:
3902 xchg %ax,%ax */
3903
3904 bfd_vma roff;
3905
3906 roff = rel->r_offset;
3907 bfd_put_8 (output_bfd, 0x66, contents + roff);
3908 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3909 continue;
3910 }
3911 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3912 {
3913 unsigned int val;
3914
3915 /* IE->LE transition:
3916 Originally it can be one of:
3917 movl foo, %eax
3918 movl foo, %reg
3919 addl foo, %reg
3920 We change it into:
3921 movl $foo, %eax
3922 movl $foo, %reg
3923 addl $foo, %reg. */
3924 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3925 if (val == 0xa1)
3926 {
3927 /* movl foo, %eax. */
3928 bfd_put_8 (output_bfd, 0xb8,
3929 contents + rel->r_offset - 1);
3930 }
3931 else
3932 {
3933 unsigned int type;
3934
3935 type = bfd_get_8 (input_bfd,
3936 contents + rel->r_offset - 2);
3937 switch (type)
3938 {
3939 case 0x8b:
3940 /* movl */
3941 bfd_put_8 (output_bfd, 0xc7,
3942 contents + rel->r_offset - 2);
3943 bfd_put_8 (output_bfd,
3944 0xc0 | ((val >> 3) & 7),
3945 contents + rel->r_offset - 1);
3946 break;
3947 case 0x03:
3948 /* addl */
3949 bfd_put_8 (output_bfd, 0x81,
3950 contents + rel->r_offset - 2);
3951 bfd_put_8 (output_bfd,
3952 0xc0 | ((val >> 3) & 7),
3953 contents + rel->r_offset - 1);
3954 break;
3955 default:
3956 BFD_FAIL ();
3957 break;
3958 }
3959 }
3960 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3961 contents + rel->r_offset);
3962 continue;
3963 }
3964 else
3965 {
3966 unsigned int val, type;
3967
3968 /* {IE_32,GOTIE}->LE transition:
3969 Originally it can be one of:
3970 subl foo(%reg1), %reg2
3971 movl foo(%reg1), %reg2
3972 addl foo(%reg1), %reg2
3973 We change it into:
3974 subl $foo, %reg2
3975 movl $foo, %reg2 (6 byte form)
3976 addl $foo, %reg2. */
3977 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3978 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3979 if (type == 0x8b)
3980 {
3981 /* movl */
3982 bfd_put_8 (output_bfd, 0xc7,
3983 contents + rel->r_offset - 2);
3984 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3985 contents + rel->r_offset - 1);
3986 }
3987 else if (type == 0x2b)
3988 {
3989 /* subl */
3990 bfd_put_8 (output_bfd, 0x81,
3991 contents + rel->r_offset - 2);
3992 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3993 contents + rel->r_offset - 1);
3994 }
3995 else if (type == 0x03)
3996 {
3997 /* addl */
3998 bfd_put_8 (output_bfd, 0x81,
3999 contents + rel->r_offset - 2);
4000 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4001 contents + rel->r_offset - 1);
4002 }
4003 else
4004 BFD_FAIL ();
4005 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4006 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4007 contents + rel->r_offset);
4008 else
4009 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4010 contents + rel->r_offset);
4011 continue;
4012 }
4013 }
4014
4015 if (htab->elf.sgot == NULL)
4016 abort ();
4017
4018 if (h != NULL)
4019 {
4020 off = h->got.offset;
4021 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4022 }
4023 else
4024 {
4025 if (local_got_offsets == NULL)
4026 abort ();
4027
4028 off = local_got_offsets[r_symndx];
4029 offplt = local_tlsdesc_gotents[r_symndx];
4030 }
4031
4032 if ((off & 1) != 0)
4033 off &= ~1;
4034 else
4035 {
4036 Elf_Internal_Rela outrel;
4037 bfd_byte *loc;
4038 int dr_type;
4039 asection *sreloc;
4040
4041 if (htab->elf.srelgot == NULL)
4042 abort ();
4043
4044 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4045
4046 if (GOT_TLS_GDESC_P (tls_type))
4047 {
4048 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4049 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4050 <= htab->elf.sgotplt->size);
4051 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4052 + htab->elf.sgotplt->output_offset
4053 + offplt
4054 + htab->sgotplt_jump_table_size);
4055 sreloc = htab->elf.srelplt;
4056 loc = sreloc->contents;
4057 loc += (htab->next_tls_desc_index++
4058 * sizeof (Elf32_External_Rel));
4059 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4060 <= sreloc->contents + sreloc->size);
4061 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4062 if (indx == 0)
4063 {
4064 BFD_ASSERT (! unresolved_reloc);
4065 bfd_put_32 (output_bfd,
4066 relocation - elf_i386_dtpoff_base (info),
4067 htab->elf.sgotplt->contents + offplt
4068 + htab->sgotplt_jump_table_size + 4);
4069 }
4070 else
4071 {
4072 bfd_put_32 (output_bfd, 0,
4073 htab->elf.sgotplt->contents + offplt
4074 + htab->sgotplt_jump_table_size + 4);
4075 }
4076 }
4077
4078 sreloc = htab->elf.srelgot;
4079
4080 outrel.r_offset = (htab->elf.sgot->output_section->vma
4081 + htab->elf.sgot->output_offset + off);
4082
4083 if (GOT_TLS_GD_P (tls_type))
4084 dr_type = R_386_TLS_DTPMOD32;
4085 else if (GOT_TLS_GDESC_P (tls_type))
4086 goto dr_done;
4087 else if (tls_type == GOT_TLS_IE_POS)
4088 dr_type = R_386_TLS_TPOFF;
4089 else
4090 dr_type = R_386_TLS_TPOFF32;
4091
4092 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4093 bfd_put_32 (output_bfd,
4094 relocation - elf_i386_dtpoff_base (info),
4095 htab->elf.sgot->contents + off);
4096 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4097 bfd_put_32 (output_bfd,
4098 elf_i386_dtpoff_base (info) - relocation,
4099 htab->elf.sgot->contents + off);
4100 else if (dr_type != R_386_TLS_DESC)
4101 bfd_put_32 (output_bfd, 0,
4102 htab->elf.sgot->contents + off);
4103 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4104
4105 loc = sreloc->contents;
4106 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4107 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4108 <= sreloc->contents + sreloc->size);
4109 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4110
4111 if (GOT_TLS_GD_P (tls_type))
4112 {
4113 if (indx == 0)
4114 {
4115 BFD_ASSERT (! unresolved_reloc);
4116 bfd_put_32 (output_bfd,
4117 relocation - elf_i386_dtpoff_base (info),
4118 htab->elf.sgot->contents + off + 4);
4119 }
4120 else
4121 {
4122 bfd_put_32 (output_bfd, 0,
4123 htab->elf.sgot->contents + off + 4);
4124 outrel.r_info = ELF32_R_INFO (indx,
4125 R_386_TLS_DTPOFF32);
4126 outrel.r_offset += 4;
4127 sreloc->reloc_count++;
4128 loc += sizeof (Elf32_External_Rel);
4129 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4130 <= sreloc->contents + sreloc->size);
4131 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4132 }
4133 }
4134 else if (tls_type == GOT_TLS_IE_BOTH)
4135 {
4136 bfd_put_32 (output_bfd,
4137 (indx == 0
4138 ? relocation - elf_i386_dtpoff_base (info)
4139 : 0),
4140 htab->elf.sgot->contents + off + 4);
4141 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4142 outrel.r_offset += 4;
4143 sreloc->reloc_count++;
4144 loc += sizeof (Elf32_External_Rel);
4145 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4146 }
4147
4148 dr_done:
4149 if (h != NULL)
4150 h->got.offset |= 1;
4151 else
4152 local_got_offsets[r_symndx] |= 1;
4153 }
4154
4155 if (off >= (bfd_vma) -2
4156 && ! GOT_TLS_GDESC_P (tls_type))
4157 abort ();
4158 if (r_type == R_386_TLS_GOTDESC
4159 || r_type == R_386_TLS_DESC_CALL)
4160 {
4161 relocation = htab->sgotplt_jump_table_size + offplt;
4162 unresolved_reloc = FALSE;
4163 }
4164 else if (r_type == ELF32_R_TYPE (rel->r_info))
4165 {
4166 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4167 + htab->elf.sgotplt->output_offset;
4168 relocation = htab->elf.sgot->output_section->vma
4169 + htab->elf.sgot->output_offset + off - g_o_t;
4170 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4171 && tls_type == GOT_TLS_IE_BOTH)
4172 relocation += 4;
4173 if (r_type == R_386_TLS_IE)
4174 relocation += g_o_t;
4175 unresolved_reloc = FALSE;
4176 }
4177 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4178 {
4179 unsigned int val, type;
4180 bfd_vma roff;
4181
4182 /* GD->IE transition. */
4183 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4184 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4185 if (type == 0x04)
4186 {
4187 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4188 Change it into:
4189 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4190 val >>= 3;
4191 roff = rel->r_offset - 3;
4192 }
4193 else
4194 {
4195 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4196 Change it into:
4197 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4198 roff = rel->r_offset - 2;
4199 }
4200 memcpy (contents + roff,
4201 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4202 contents[roff + 7] = 0x80 | (val & 7);
4203 /* If foo is used only with foo@gotntpoff(%reg) and
4204 foo@indntpoff, but not with foo@gottpoff(%reg), change
4205 subl $foo@gottpoff(%reg), %eax
4206 into:
4207 addl $foo@gotntpoff(%reg), %eax. */
4208 if (tls_type == GOT_TLS_IE_POS)
4209 contents[roff + 6] = 0x03;
4210 bfd_put_32 (output_bfd,
4211 htab->elf.sgot->output_section->vma
4212 + htab->elf.sgot->output_offset + off
4213 - htab->elf.sgotplt->output_section->vma
4214 - htab->elf.sgotplt->output_offset,
4215 contents + roff + 8);
4216 /* Skip R_386_PLT32. */
4217 rel++;
4218 continue;
4219 }
4220 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4221 {
4222 /* GDesc -> IE transition.
4223 It's originally something like:
4224 leal x@tlsdesc(%ebx), %eax
4225
4226 Change it to:
4227 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4228 or:
4229 movl x@gottpoff(%ebx), %eax # before negl %eax
4230
4231 Registers other than %eax may be set up here. */
4232
4233 bfd_vma roff;
4234
4235 /* First, make sure it's a leal adding ebx to a 32-bit
4236 offset into any register, although it's probably
4237 almost always going to be eax. */
4238 roff = rel->r_offset;
4239
4240 /* Now modify the instruction as appropriate. */
4241 /* To turn a leal into a movl in the form we use it, it
4242 suffices to change the first byte from 0x8d to 0x8b.
4243 aoliva FIXME: should we decide to keep the leal, all
4244 we have to do is remove the statement below, and
4245 adjust the relaxation of R_386_TLS_DESC_CALL. */
4246 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4247
4248 if (tls_type == GOT_TLS_IE_BOTH)
4249 off += 4;
4250
4251 bfd_put_32 (output_bfd,
4252 htab->elf.sgot->output_section->vma
4253 + htab->elf.sgot->output_offset + off
4254 - htab->elf.sgotplt->output_section->vma
4255 - htab->elf.sgotplt->output_offset,
4256 contents + roff);
4257 continue;
4258 }
4259 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4260 {
4261 /* GDesc -> IE transition.
4262 It's originally:
4263 call *(%eax)
4264
4265 Change it to:
4266 xchg %ax,%ax
4267 or
4268 negl %eax
4269 depending on how we transformed the TLS_GOTDESC above.
4270 */
4271
4272 bfd_vma roff;
4273
4274 roff = rel->r_offset;
4275
4276 /* Now modify the instruction as appropriate. */
4277 if (tls_type != GOT_TLS_IE_NEG)
4278 {
4279 /* xchg %ax,%ax */
4280 bfd_put_8 (output_bfd, 0x66, contents + roff);
4281 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4282 }
4283 else
4284 {
4285 /* negl %eax */
4286 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4287 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4288 }
4289
4290 continue;
4291 }
4292 else
4293 BFD_ASSERT (FALSE);
4294 break;
4295
4296 case R_386_TLS_LDM:
4297 if (! elf_i386_tls_transition (info, input_bfd,
4298 input_section, contents,
4299 symtab_hdr, sym_hashes,
4300 &r_type, GOT_UNKNOWN, rel,
4301 relend, h, r_symndx))
4302 return FALSE;
4303
4304 if (r_type != R_386_TLS_LDM)
4305 {
4306 /* LD->LE transition:
4307 leal foo(%reg), %eax; call ___tls_get_addr.
4308 We change it into:
4309 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4310 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4311 memcpy (contents + rel->r_offset - 2,
4312 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4313 /* Skip R_386_PC32/R_386_PLT32. */
4314 rel++;
4315 continue;
4316 }
4317
4318 if (htab->elf.sgot == NULL)
4319 abort ();
4320
4321 off = htab->tls_ldm_got.offset;
4322 if (off & 1)
4323 off &= ~1;
4324 else
4325 {
4326 Elf_Internal_Rela outrel;
4327 bfd_byte *loc;
4328
4329 if (htab->elf.srelgot == NULL)
4330 abort ();
4331
4332 outrel.r_offset = (htab->elf.sgot->output_section->vma
4333 + htab->elf.sgot->output_offset + off);
4334
4335 bfd_put_32 (output_bfd, 0,
4336 htab->elf.sgot->contents + off);
4337 bfd_put_32 (output_bfd, 0,
4338 htab->elf.sgot->contents + off + 4);
4339 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4340 loc = htab->elf.srelgot->contents;
4341 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4342 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4343 htab->tls_ldm_got.offset |= 1;
4344 }
4345 relocation = htab->elf.sgot->output_section->vma
4346 + htab->elf.sgot->output_offset + off
4347 - htab->elf.sgotplt->output_section->vma
4348 - htab->elf.sgotplt->output_offset;
4349 unresolved_reloc = FALSE;
4350 break;
4351
4352 case R_386_TLS_LDO_32:
4353 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4354 relocation -= elf_i386_dtpoff_base (info);
4355 else
4356 /* When converting LDO to LE, we must negate. */
4357 relocation = -elf_i386_tpoff (info, relocation);
4358 break;
4359
4360 case R_386_TLS_LE_32:
4361 case R_386_TLS_LE:
4362 if (!info->executable)
4363 {
4364 Elf_Internal_Rela outrel;
4365 asection *sreloc;
4366 bfd_byte *loc;
4367
4368 outrel.r_offset = rel->r_offset
4369 + input_section->output_section->vma
4370 + input_section->output_offset;
4371 if (h != NULL && h->dynindx != -1)
4372 indx = h->dynindx;
4373 else
4374 indx = 0;
4375 if (r_type == R_386_TLS_LE_32)
4376 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4377 else
4378 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4379 sreloc = elf_section_data (input_section)->sreloc;
4380 if (sreloc == NULL)
4381 abort ();
4382 loc = sreloc->contents;
4383 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4384 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4385 if (indx)
4386 continue;
4387 else if (r_type == R_386_TLS_LE_32)
4388 relocation = elf_i386_dtpoff_base (info) - relocation;
4389 else
4390 relocation -= elf_i386_dtpoff_base (info);
4391 }
4392 else if (r_type == R_386_TLS_LE_32)
4393 relocation = elf_i386_tpoff (info, relocation);
4394 else
4395 relocation = -elf_i386_tpoff (info, relocation);
4396 break;
4397
4398 default:
4399 break;
4400 }
4401
4402 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4403 because such sections are not SEC_ALLOC and thus ld.so will
4404 not process them. */
4405 if (unresolved_reloc
4406 && !((input_section->flags & SEC_DEBUGGING) != 0
4407 && h->def_dynamic)
4408 && _bfd_elf_section_offset (output_bfd, info, input_section,
4409 rel->r_offset) != (bfd_vma) -1)
4410 {
4411 (*_bfd_error_handler)
4412 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4413 input_bfd,
4414 input_section,
4415 (long) rel->r_offset,
4416 howto->name,
4417 h->root.root.string);
4418 return FALSE;
4419 }
4420
4421 do_relocation:
4422 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4423 contents, rel->r_offset,
4424 relocation, 0);
4425
4426 check_relocation_error:
4427 if (r != bfd_reloc_ok)
4428 {
4429 const char *name;
4430
4431 if (h != NULL)
4432 name = h->root.root.string;
4433 else
4434 {
4435 name = bfd_elf_string_from_elf_section (input_bfd,
4436 symtab_hdr->sh_link,
4437 sym->st_name);
4438 if (name == NULL)
4439 return FALSE;
4440 if (*name == '\0')
4441 name = bfd_section_name (input_bfd, sec);
4442 }
4443
4444 if (r == bfd_reloc_overflow)
4445 {
4446 if (! ((*info->callbacks->reloc_overflow)
4447 (info, (h ? &h->root : NULL), name, howto->name,
4448 (bfd_vma) 0, input_bfd, input_section,
4449 rel->r_offset)))
4450 return FALSE;
4451 }
4452 else
4453 {
4454 (*_bfd_error_handler)
4455 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4456 input_bfd, input_section,
4457 (long) rel->r_offset, name, (int) r);
4458 return FALSE;
4459 }
4460 }
4461 }
4462
4463 return TRUE;
4464 }
4465
4466 /* Finish up dynamic symbol handling. We set the contents of various
4467 dynamic sections here. */
4468
4469 static bfd_boolean
4470 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4471 struct bfd_link_info *info,
4472 struct elf_link_hash_entry *h,
4473 Elf_Internal_Sym *sym)
4474 {
4475 struct elf_i386_link_hash_table *htab;
4476 unsigned plt_entry_size;
4477 const struct elf_i386_backend_data *abed;
4478
4479 htab = elf_i386_hash_table (info);
4480 if (htab == NULL)
4481 return FALSE;
4482
4483 abed = get_elf_i386_backend_data (output_bfd);
4484 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4485
4486 if (h->plt.offset != (bfd_vma) -1)
4487 {
4488 bfd_vma plt_index;
4489 bfd_vma got_offset;
4490 Elf_Internal_Rela rel;
4491 bfd_byte *loc;
4492 asection *plt, *gotplt, *relplt;
4493
4494 /* When building a static executable, use .iplt, .igot.plt and
4495 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4496 if (htab->elf.splt != NULL)
4497 {
4498 plt = htab->elf.splt;
4499 gotplt = htab->elf.sgotplt;
4500 relplt = htab->elf.srelplt;
4501 }
4502 else
4503 {
4504 plt = htab->elf.iplt;
4505 gotplt = htab->elf.igotplt;
4506 relplt = htab->elf.irelplt;
4507 }
4508
4509 /* This symbol has an entry in the procedure linkage table. Set
4510 it up. */
4511
4512 if ((h->dynindx == -1
4513 && !((h->forced_local || info->executable)
4514 && h->def_regular
4515 && h->type == STT_GNU_IFUNC))
4516 || plt == NULL
4517 || gotplt == NULL
4518 || relplt == NULL)
4519 abort ();
4520
4521 /* Get the index in the procedure linkage table which
4522 corresponds to this symbol. This is the index of this symbol
4523 in all the symbols for which we are making plt entries. The
4524 first entry in the procedure linkage table is reserved.
4525
4526 Get the offset into the .got table of the entry that
4527 corresponds to this function. Each .got entry is 4 bytes.
4528 The first three are reserved.
4529
4530 For static executables, we don't reserve anything. */
4531
4532 if (plt == htab->elf.splt)
4533 {
4534 got_offset = h->plt.offset / plt_entry_size - 1;
4535 got_offset = (got_offset + 3) * 4;
4536 }
4537 else
4538 {
4539 got_offset = h->plt.offset / plt_entry_size;
4540 got_offset = got_offset * 4;
4541 }
4542
4543 /* Fill in the entry in the procedure linkage table. */
4544 if (! info->shared)
4545 {
4546 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4547 abed->plt->plt_entry_size);
4548 bfd_put_32 (output_bfd,
4549 (gotplt->output_section->vma
4550 + gotplt->output_offset
4551 + got_offset),
4552 plt->contents + h->plt.offset
4553 + abed->plt->plt_got_offset);
4554
4555 if (abed->is_vxworks)
4556 {
4557 int s, k, reloc_index;
4558
4559 /* Create the R_386_32 relocation referencing the GOT
4560 for this PLT entry. */
4561
4562 /* S: Current slot number (zero-based). */
4563 s = ((h->plt.offset - abed->plt->plt_entry_size)
4564 / abed->plt->plt_entry_size);
4565 /* K: Number of relocations for PLTResolve. */
4566 if (info->shared)
4567 k = PLTRESOLVE_RELOCS_SHLIB;
4568 else
4569 k = PLTRESOLVE_RELOCS;
4570 /* Skip the PLTresolve relocations, and the relocations for
4571 the other PLT slots. */
4572 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4573 loc = (htab->srelplt2->contents + reloc_index
4574 * sizeof (Elf32_External_Rel));
4575
4576 rel.r_offset = (htab->elf.splt->output_section->vma
4577 + htab->elf.splt->output_offset
4578 + h->plt.offset + 2),
4579 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4580 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4581
4582 /* Create the R_386_32 relocation referencing the beginning of
4583 the PLT for this GOT entry. */
4584 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4585 + htab->elf.sgotplt->output_offset
4586 + got_offset);
4587 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4588 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4589 loc + sizeof (Elf32_External_Rel));
4590 }
4591 }
4592 else
4593 {
4594 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4595 abed->plt->plt_entry_size);
4596 bfd_put_32 (output_bfd, got_offset,
4597 plt->contents + h->plt.offset
4598 + abed->plt->plt_got_offset);
4599 }
4600
4601 /* Fill in the entry in the global offset table. */
4602 bfd_put_32 (output_bfd,
4603 (plt->output_section->vma
4604 + plt->output_offset
4605 + h->plt.offset
4606 + abed->plt->plt_lazy_offset),
4607 gotplt->contents + got_offset);
4608
4609 /* Fill in the entry in the .rel.plt section. */
4610 rel.r_offset = (gotplt->output_section->vma
4611 + gotplt->output_offset
4612 + got_offset);
4613 if (h->dynindx == -1
4614 || ((info->executable
4615 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4616 && h->def_regular
4617 && h->type == STT_GNU_IFUNC))
4618 {
4619 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4620 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4621 in the .got.plt section. */
4622 bfd_put_32 (output_bfd,
4623 (h->root.u.def.value
4624 + h->root.u.def.section->output_section->vma
4625 + h->root.u.def.section->output_offset),
4626 gotplt->contents + got_offset);
4627 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4628 /* R_386_IRELATIVE comes last. */
4629 plt_index = htab->next_irelative_index--;
4630 }
4631 else
4632 {
4633 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4634 plt_index = htab->next_jump_slot_index++;
4635 }
4636 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4637 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4638
4639 /* Don't fill PLT entry for static executables. */
4640 if (plt == htab->elf.splt)
4641 {
4642 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4643 plt->contents + h->plt.offset
4644 + abed->plt->plt_reloc_offset);
4645 bfd_put_32 (output_bfd, - (h->plt.offset
4646 + abed->plt->plt_plt_offset + 4),
4647 plt->contents + h->plt.offset
4648 + abed->plt->plt_plt_offset);
4649 }
4650
4651 if (!h->def_regular)
4652 {
4653 /* Mark the symbol as undefined, rather than as defined in
4654 the .plt section. Leave the value if there were any
4655 relocations where pointer equality matters (this is a clue
4656 for the dynamic linker, to make function pointer
4657 comparisons work between an application and shared
4658 library), otherwise set it to zero. If a function is only
4659 called from a binary, there is no need to slow down
4660 shared libraries because of that. */
4661 sym->st_shndx = SHN_UNDEF;
4662 if (!h->pointer_equality_needed)
4663 sym->st_value = 0;
4664 }
4665 }
4666
4667 if (h->got.offset != (bfd_vma) -1
4668 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4669 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4670 {
4671 Elf_Internal_Rela rel;
4672 bfd_byte *loc;
4673
4674 /* This symbol has an entry in the global offset table. Set it
4675 up. */
4676
4677 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4678 abort ();
4679
4680 rel.r_offset = (htab->elf.sgot->output_section->vma
4681 + htab->elf.sgot->output_offset
4682 + (h->got.offset & ~(bfd_vma) 1));
4683
4684 /* If this is a static link, or it is a -Bsymbolic link and the
4685 symbol is defined locally or was forced to be local because
4686 of a version file, we just want to emit a RELATIVE reloc.
4687 The entry in the global offset table will already have been
4688 initialized in the relocate_section function. */
4689 if (h->def_regular
4690 && h->type == STT_GNU_IFUNC)
4691 {
4692 if (info->shared)
4693 {
4694 /* Generate R_386_GLOB_DAT. */
4695 goto do_glob_dat;
4696 }
4697 else
4698 {
4699 asection *plt;
4700
4701 if (!h->pointer_equality_needed)
4702 abort ();
4703
4704 /* For non-shared object, we can't use .got.plt, which
4705 contains the real function addres if we need pointer
4706 equality. We load the GOT entry with the PLT entry. */
4707 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4708 bfd_put_32 (output_bfd,
4709 (plt->output_section->vma
4710 + plt->output_offset + h->plt.offset),
4711 htab->elf.sgot->contents + h->got.offset);
4712 return TRUE;
4713 }
4714 }
4715 else if (info->shared
4716 && SYMBOL_REFERENCES_LOCAL (info, h))
4717 {
4718 BFD_ASSERT((h->got.offset & 1) != 0);
4719 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4720 }
4721 else
4722 {
4723 BFD_ASSERT((h->got.offset & 1) == 0);
4724 do_glob_dat:
4725 bfd_put_32 (output_bfd, (bfd_vma) 0,
4726 htab->elf.sgot->contents + h->got.offset);
4727 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4728 }
4729
4730 loc = htab->elf.srelgot->contents;
4731 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4732 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4733 }
4734
4735 if (h->needs_copy)
4736 {
4737 Elf_Internal_Rela rel;
4738 bfd_byte *loc;
4739
4740 /* This symbol needs a copy reloc. Set it up. */
4741
4742 if (h->dynindx == -1
4743 || (h->root.type != bfd_link_hash_defined
4744 && h->root.type != bfd_link_hash_defweak)
4745 || htab->srelbss == NULL)
4746 abort ();
4747
4748 rel.r_offset = (h->root.u.def.value
4749 + h->root.u.def.section->output_section->vma
4750 + h->root.u.def.section->output_offset);
4751 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4752 loc = htab->srelbss->contents;
4753 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4754 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4755 }
4756
4757 return TRUE;
4758 }
4759
4760 /* Finish up local dynamic symbol handling. We set the contents of
4761 various dynamic sections here. */
4762
4763 static bfd_boolean
4764 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4765 {
4766 struct elf_link_hash_entry *h
4767 = (struct elf_link_hash_entry *) *slot;
4768 struct bfd_link_info *info
4769 = (struct bfd_link_info *) inf;
4770
4771 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4772 h, NULL);
4773 }
4774
4775 /* Used to decide how to sort relocs in an optimal manner for the
4776 dynamic linker, before writing them out. */
4777
4778 static enum elf_reloc_type_class
4779 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4780 {
4781 switch (ELF32_R_TYPE (rela->r_info))
4782 {
4783 case R_386_RELATIVE:
4784 return reloc_class_relative;
4785 case R_386_JUMP_SLOT:
4786 return reloc_class_plt;
4787 case R_386_COPY:
4788 return reloc_class_copy;
4789 default:
4790 return reloc_class_normal;
4791 }
4792 }
4793
4794 /* Finish up the dynamic sections. */
4795
4796 static bfd_boolean
4797 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4798 struct bfd_link_info *info)
4799 {
4800 struct elf_i386_link_hash_table *htab;
4801 bfd *dynobj;
4802 asection *sdyn;
4803 const struct elf_i386_backend_data *abed;
4804
4805 htab = elf_i386_hash_table (info);
4806 if (htab == NULL)
4807 return FALSE;
4808
4809 dynobj = htab->elf.dynobj;
4810 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4811 abed = get_elf_i386_backend_data (output_bfd);
4812
4813 if (htab->elf.dynamic_sections_created)
4814 {
4815 Elf32_External_Dyn *dyncon, *dynconend;
4816
4817 if (sdyn == NULL || htab->elf.sgot == NULL)
4818 abort ();
4819
4820 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4821 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4822 for (; dyncon < dynconend; dyncon++)
4823 {
4824 Elf_Internal_Dyn dyn;
4825 asection *s;
4826
4827 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4828
4829 switch (dyn.d_tag)
4830 {
4831 default:
4832 if (abed->is_vxworks
4833 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4834 break;
4835 continue;
4836
4837 case DT_PLTGOT:
4838 s = htab->elf.sgotplt;
4839 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4840 break;
4841
4842 case DT_JMPREL:
4843 s = htab->elf.srelplt;
4844 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4845 break;
4846
4847 case DT_PLTRELSZ:
4848 s = htab->elf.srelplt;
4849 dyn.d_un.d_val = s->size;
4850 break;
4851
4852 case DT_RELSZ:
4853 /* My reading of the SVR4 ABI indicates that the
4854 procedure linkage table relocs (DT_JMPREL) should be
4855 included in the overall relocs (DT_REL). This is
4856 what Solaris does. However, UnixWare can not handle
4857 that case. Therefore, we override the DT_RELSZ entry
4858 here to make it not include the JMPREL relocs. */
4859 s = htab->elf.srelplt;
4860 if (s == NULL)
4861 continue;
4862 dyn.d_un.d_val -= s->size;
4863 break;
4864
4865 case DT_REL:
4866 /* We may not be using the standard ELF linker script.
4867 If .rel.plt is the first .rel section, we adjust
4868 DT_REL to not include it. */
4869 s = htab->elf.srelplt;
4870 if (s == NULL)
4871 continue;
4872 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4873 continue;
4874 dyn.d_un.d_ptr += s->size;
4875 break;
4876 }
4877
4878 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4879 }
4880
4881 /* Fill in the first entry in the procedure linkage table. */
4882 if (htab->elf.splt && htab->elf.splt->size > 0)
4883 {
4884 if (info->shared)
4885 {
4886 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4887 abed->plt->plt0_entry_size);
4888 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4889 abed->plt0_pad_byte,
4890 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4891 }
4892 else
4893 {
4894 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4895 abed->plt->plt0_entry_size);
4896 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4897 abed->plt0_pad_byte,
4898 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4899 bfd_put_32 (output_bfd,
4900 (htab->elf.sgotplt->output_section->vma
4901 + htab->elf.sgotplt->output_offset
4902 + 4),
4903 htab->elf.splt->contents
4904 + abed->plt->plt0_got1_offset);
4905 bfd_put_32 (output_bfd,
4906 (htab->elf.sgotplt->output_section->vma
4907 + htab->elf.sgotplt->output_offset
4908 + 8),
4909 htab->elf.splt->contents
4910 + abed->plt->plt0_got2_offset);
4911
4912 if (abed->is_vxworks)
4913 {
4914 Elf_Internal_Rela rel;
4915
4916 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4917 On IA32 we use REL relocations so the addend goes in
4918 the PLT directly. */
4919 rel.r_offset = (htab->elf.splt->output_section->vma
4920 + htab->elf.splt->output_offset
4921 + abed->plt->plt0_got1_offset);
4922 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4923 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4924 htab->srelplt2->contents);
4925 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4926 rel.r_offset = (htab->elf.splt->output_section->vma
4927 + htab->elf.splt->output_offset
4928 + abed->plt->plt0_got2_offset);
4929 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4930 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4931 htab->srelplt2->contents +
4932 sizeof (Elf32_External_Rel));
4933 }
4934 }
4935
4936 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4937 really seem like the right value. */
4938 elf_section_data (htab->elf.splt->output_section)
4939 ->this_hdr.sh_entsize = 4;
4940
4941 /* Correct the .rel.plt.unloaded relocations. */
4942 if (abed->is_vxworks && !info->shared)
4943 {
4944 int num_plts = (htab->elf.splt->size
4945 / abed->plt->plt_entry_size) - 1;
4946 unsigned char *p;
4947
4948 p = htab->srelplt2->contents;
4949 if (info->shared)
4950 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4951 else
4952 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4953
4954 for (; num_plts; num_plts--)
4955 {
4956 Elf_Internal_Rela rel;
4957 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4958 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4959 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4960 p += sizeof (Elf32_External_Rel);
4961
4962 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4963 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4964 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4965 p += sizeof (Elf32_External_Rel);
4966 }
4967 }
4968 }
4969 }
4970
4971 if (htab->elf.sgotplt)
4972 {
4973 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4974 {
4975 (*_bfd_error_handler)
4976 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4977 return FALSE;
4978 }
4979
4980 /* Fill in the first three entries in the global offset table. */
4981 if (htab->elf.sgotplt->size > 0)
4982 {
4983 bfd_put_32 (output_bfd,
4984 (sdyn == NULL ? 0
4985 : sdyn->output_section->vma + sdyn->output_offset),
4986 htab->elf.sgotplt->contents);
4987 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4988 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4989 }
4990
4991 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4992 }
4993
4994 /* Adjust .eh_frame for .plt section. */
4995 if (htab->plt_eh_frame != NULL
4996 && htab->plt_eh_frame->contents != NULL)
4997 {
4998 if (htab->elf.splt != NULL
4999 && htab->elf.splt->size != 0
5000 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5001 && htab->elf.splt->output_section != NULL
5002 && htab->plt_eh_frame->output_section != NULL)
5003 {
5004 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5005 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5006 + htab->plt_eh_frame->output_offset
5007 + PLT_FDE_START_OFFSET;
5008 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5009 htab->plt_eh_frame->contents
5010 + PLT_FDE_START_OFFSET);
5011 }
5012 if (htab->plt_eh_frame->sec_info_type
5013 == SEC_INFO_TYPE_EH_FRAME)
5014 {
5015 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5016 htab->plt_eh_frame,
5017 htab->plt_eh_frame->contents))
5018 return FALSE;
5019 }
5020 }
5021
5022 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5023 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5024
5025 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5026 htab_traverse (htab->loc_hash_table,
5027 elf_i386_finish_local_dynamic_symbol,
5028 info);
5029
5030 return TRUE;
5031 }
5032
5033 /* Return address for Ith PLT stub in section PLT, for relocation REL
5034 or (bfd_vma) -1 if it should not be included. */
5035
5036 static bfd_vma
5037 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
5038 const arelent *rel ATTRIBUTE_UNUSED)
5039 {
5040 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5041 }
5042
5043 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5044
5045 static bfd_boolean
5046 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5047 {
5048 if (h->plt.offset != (bfd_vma) -1
5049 && !h->def_regular
5050 && !h->pointer_equality_needed)
5051 return FALSE;
5052
5053 return _bfd_elf_hash_symbol (h);
5054 }
5055
5056 /* Hook called by the linker routine which adds symbols from an object
5057 file. */
5058
5059 static bfd_boolean
5060 elf_i386_add_symbol_hook (bfd * abfd,
5061 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5062 Elf_Internal_Sym * sym,
5063 const char ** namep ATTRIBUTE_UNUSED,
5064 flagword * flagsp ATTRIBUTE_UNUSED,
5065 asection ** secp ATTRIBUTE_UNUSED,
5066 bfd_vma * valp ATTRIBUTE_UNUSED)
5067 {
5068 if ((abfd->flags & DYNAMIC) == 0
5069 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5070 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5071 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5072
5073 return TRUE;
5074 }
5075
5076 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5077 #define TARGET_LITTLE_NAME "elf32-i386"
5078 #define ELF_ARCH bfd_arch_i386
5079 #define ELF_TARGET_ID I386_ELF_DATA
5080 #define ELF_MACHINE_CODE EM_386
5081 #define ELF_MAXPAGESIZE 0x1000
5082
5083 #define elf_backend_can_gc_sections 1
5084 #define elf_backend_can_refcount 1
5085 #define elf_backend_want_got_plt 1
5086 #define elf_backend_plt_readonly 1
5087 #define elf_backend_want_plt_sym 0
5088 #define elf_backend_got_header_size 12
5089 #define elf_backend_plt_alignment 4
5090
5091 /* Support RELA for objdump of prelink objects. */
5092 #define elf_info_to_howto elf_i386_info_to_howto_rel
5093 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5094
5095 #define bfd_elf32_mkobject elf_i386_mkobject
5096
5097 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5098 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5099 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5100 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5101 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5102
5103 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5104 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5105 #define elf_backend_check_relocs elf_i386_check_relocs
5106 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5107 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5108 #define elf_backend_fake_sections elf_i386_fake_sections
5109 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5110 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5111 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5112 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5113 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5114 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5115 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5116 #define elf_backend_relocate_section elf_i386_relocate_section
5117 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5118 #define elf_backend_always_size_sections elf_i386_always_size_sections
5119 #define elf_backend_omit_section_dynsym \
5120 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5121 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5122 #define elf_backend_hash_symbol elf_i386_hash_symbol
5123 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5124 #undef elf_backend_post_process_headers
5125 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5126
5127 #include "elf32-target.h"
5128
5129 /* FreeBSD support. */
5130
5131 #undef TARGET_LITTLE_SYM
5132 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5133 #undef TARGET_LITTLE_NAME
5134 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5135 #undef ELF_OSABI
5136 #define ELF_OSABI ELFOSABI_FREEBSD
5137
5138 /* The kernel recognizes executables as valid only if they carry a
5139 "FreeBSD" label in the ELF header. So we put this label on all
5140 executables and (for simplicity) also all other object files. */
5141
5142 static void
5143 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5144 {
5145 _bfd_elf_set_osabi (abfd, info);
5146
5147 #ifdef OLD_FREEBSD_ABI_LABEL
5148 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5149 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5150 #endif
5151 }
5152
5153 #undef elf_backend_post_process_headers
5154 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5155 #undef elf32_bed
5156 #define elf32_bed elf32_i386_fbsd_bed
5157
5158 #undef elf_backend_add_symbol_hook
5159
5160 #include "elf32-target.h"
5161
5162 /* Solaris 2. */
5163
5164 #undef TARGET_LITTLE_SYM
5165 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5166 #undef TARGET_LITTLE_NAME
5167 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5168
5169 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5170 objects won't be recognized. */
5171 #undef ELF_OSABI
5172
5173 #undef elf32_bed
5174 #define elf32_bed elf32_i386_sol2_bed
5175
5176 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5177 boundary. */
5178 #undef elf_backend_static_tls_alignment
5179 #define elf_backend_static_tls_alignment 8
5180
5181 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5182
5183 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5184 File, p.63. */
5185 #undef elf_backend_want_plt_sym
5186 #define elf_backend_want_plt_sym 1
5187
5188 #include "elf32-target.h"
5189
5190 /* Native Client support. */
5191
5192 #undef TARGET_LITTLE_SYM
5193 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5194 #undef TARGET_LITTLE_NAME
5195 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5196 #undef elf32_bed
5197 #define elf32_bed elf32_i386_nacl_bed
5198
5199 #undef ELF_MAXPAGESIZE
5200 #define ELF_MAXPAGESIZE 0x10000
5201
5202 /* Restore defaults. */
5203 #undef ELF_OSABI
5204 #undef elf_backend_want_plt_sym
5205 #define elf_backend_want_plt_sym 0
5206 #undef elf_backend_post_process_headers
5207 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5208 #undef elf_backend_static_tls_alignment
5209
5210 /* NaCl uses substantially different PLT entries for the same effects. */
5211
5212 #undef elf_backend_plt_alignment
5213 #define elf_backend_plt_alignment 5
5214 #define NACL_PLT_ENTRY_SIZE 64
5215 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5216
5217 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5218 {
5219 0xff, 0x35, /* pushl contents of address */
5220 0, 0, 0, 0, /* replaced with address of .got + 4. */
5221 0x8b, 0x0d, /* movl contents of address, %ecx */
5222 0, 0, 0, 0, /* replaced with address of .got + 8. */
5223 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5224 0xff, 0xe1 /* jmp *%ecx */
5225 };
5226
5227 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5228 {
5229 0x8b, 0x0d, /* movl contents of address, %ecx */
5230 0, 0, 0, 0, /* replaced with GOT slot address. */
5231 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5232 0xff, 0xe1, /* jmp *%ecx */
5233
5234 /* Pad to the next 32-byte boundary with nop instructions. */
5235 0x90,
5236 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5237 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5238
5239 /* Lazy GOT entries point here (32-byte aligned). */
5240 0x68, /* pushl immediate */
5241 0, 0, 0, 0, /* replaced with reloc offset. */
5242 0xe9, /* jmp relative */
5243 0, 0, 0, 0, /* replaced with offset to .plt. */
5244
5245 /* Pad to the next 32-byte boundary with nop instructions. */
5246 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5247 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5248 0x90, 0x90
5249 };
5250
5251 static const bfd_byte
5252 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5253 {
5254 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5255 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5256 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5257 0xff, 0xe1, /* jmp *%ecx */
5258
5259 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5260 so pad to that size with nop instructions. */
5261 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5262 };
5263
5264 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5265 {
5266 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5267 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5268 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5269 0xff, 0xe1, /* jmp *%ecx */
5270
5271 /* Pad to the next 32-byte boundary with nop instructions. */
5272 0x90,
5273 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5274 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5275
5276 /* Lazy GOT entries point here (32-byte aligned). */
5277 0x68, /* pushl immediate */
5278 0, 0, 0, 0, /* replaced with offset into relocation table. */
5279 0xe9, /* jmp relative */
5280 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5281
5282 /* Pad to the next 32-byte boundary with nop instructions. */
5283 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5284 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5285 0x90, 0x90
5286 };
5287
5288 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5289 {
5290 #if (PLT_CIE_LENGTH != 20 \
5291 || PLT_FDE_LENGTH != 36 \
5292 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5293 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5294 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5295 #endif
5296 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5297 0, 0, 0, 0, /* CIE ID */
5298 1, /* CIE version */
5299 'z', 'R', 0, /* Augmentation string */
5300 1, /* Code alignment factor */
5301 0x7c, /* Data alignment factor: -4 */
5302 8, /* Return address column */
5303 1, /* Augmentation size */
5304 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5305 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5306 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5307 DW_CFA_nop, DW_CFA_nop,
5308
5309 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5310 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5311 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5312 0, 0, 0, 0, /* .plt size goes here */
5313 0, /* Augmentation size */
5314 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5315 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5316 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5317 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5318 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5319 13, /* Block length */
5320 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5321 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5322 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5323 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5324 DW_CFA_nop, DW_CFA_nop
5325 };
5326
5327 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5328 {
5329 elf_i386_nacl_plt0_entry, /* plt0_entry */
5330 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5331 2, /* plt0_got1_offset */
5332 8, /* plt0_got2_offset */
5333 elf_i386_nacl_plt_entry, /* plt_entry */
5334 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5335 2, /* plt_got_offset */
5336 33, /* plt_reloc_offset */
5337 38, /* plt_plt_offset */
5338 32, /* plt_lazy_offset */
5339 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5340 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5341 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5342 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5343 };
5344
5345 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5346 {
5347 &elf_i386_nacl_plt, /* plt */
5348 0x90, /* plt0_pad_byte: nop insn */
5349 0, /* is_vxworks */
5350 };
5351
5352 #undef elf_backend_arch_data
5353 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5354
5355 #undef elf_backend_modify_segment_map
5356 #define elf_backend_modify_segment_map nacl_modify_segment_map
5357 #undef elf_backend_modify_program_headers
5358 #define elf_backend_modify_program_headers nacl_modify_program_headers
5359
5360 #include "elf32-target.h"
5361
5362 /* Restore defaults. */
5363 #undef elf_backend_modify_segment_map
5364 #undef elf_backend_modify_program_headers
5365
5366 /* VxWorks support. */
5367
5368 #undef TARGET_LITTLE_SYM
5369 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5370 #undef TARGET_LITTLE_NAME
5371 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5372 #undef ELF_OSABI
5373 #undef elf_backend_plt_alignment
5374 #define elf_backend_plt_alignment 4
5375
5376 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5377 {
5378 &elf_i386_plt, /* plt */
5379 0x90, /* plt0_pad_byte */
5380 1, /* is_vxworks */
5381 };
5382
5383 #undef elf_backend_arch_data
5384 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5385
5386 #undef elf_backend_relocs_compatible
5387 #undef elf_backend_post_process_headers
5388 #undef elf_backend_add_symbol_hook
5389 #define elf_backend_add_symbol_hook \
5390 elf_vxworks_add_symbol_hook
5391 #undef elf_backend_link_output_symbol_hook
5392 #define elf_backend_link_output_symbol_hook \
5393 elf_vxworks_link_output_symbol_hook
5394 #undef elf_backend_emit_relocs
5395 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5396 #undef elf_backend_final_write_processing
5397 #define elf_backend_final_write_processing \
5398 elf_vxworks_final_write_processing
5399 #undef elf_backend_static_tls_alignment
5400
5401 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5402 define it. */
5403 #undef elf_backend_want_plt_sym
5404 #define elf_backend_want_plt_sym 1
5405
5406 #undef elf32_bed
5407 #define elf32_bed elf32_i386_vxworks_bed
5408
5409 #include "elf32-target.h"
GDB Binutils - Deliverables
This page took 0.18145 seconds and 4 git commands to generate.