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merge from gcc
[gdb/gnu.git] / bfd / elf32-i386.c
blob560e05cc4f775d60f747c8ca900e79c3c838990f
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, 2013
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 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
137 bfd_elf_generic_reloc, "R_386_SIZE32",
138 TRUE, 0xffffffff, 0xffffffff, FALSE),
139 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
141 TRUE, 0xffffffff, 0xffffffff, FALSE),
142 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
143 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
144 FALSE, 0, 0, FALSE),
145 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_386_TLS_DESC",
147 TRUE, 0xffffffff, 0xffffffff, FALSE),
148 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_386_IRELATIVE",
150 TRUE, 0xffffffff, 0xffffffff, FALSE),
151
152 /* Another gap. */
153 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
154 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
155
156 /* GNU extension to record C++ vtable hierarchy. */
157 HOWTO (R_386_GNU_VTINHERIT, /* type */
158 0, /* rightshift */
159 2, /* size (0 = byte, 1 = short, 2 = long) */
160 0, /* bitsize */
161 FALSE, /* pc_relative */
162 0, /* bitpos */
163 complain_overflow_dont, /* complain_on_overflow */
164 NULL, /* special_function */
165 "R_386_GNU_VTINHERIT", /* name */
166 FALSE, /* partial_inplace */
167 0, /* src_mask */
168 0, /* dst_mask */
169 FALSE), /* pcrel_offset */
170
171 /* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_386_GNU_VTENTRY, /* type */
173 0, /* rightshift */
174 2, /* size (0 = byte, 1 = short, 2 = long) */
175 0, /* bitsize */
176 FALSE, /* pc_relative */
177 0, /* bitpos */
178 complain_overflow_dont, /* complain_on_overflow */
179 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
180 "R_386_GNU_VTENTRY", /* name */
181 FALSE, /* partial_inplace */
182 0, /* src_mask */
183 0, /* dst_mask */
184 FALSE) /* pcrel_offset */
185
186 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
187
188 };
189
190 #ifdef DEBUG_GEN_RELOC
191 #define TRACE(str) \
192 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
193 #else
194 #define TRACE(str)
195 #endif
196
197 static reloc_howto_type *
198 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
199 bfd_reloc_code_real_type code)
200 {
201 switch (code)
202 {
203 case BFD_RELOC_NONE:
204 TRACE ("BFD_RELOC_NONE");
205 return &elf_howto_table[R_386_NONE];
206
207 case BFD_RELOC_32:
208 TRACE ("BFD_RELOC_32");
209 return &elf_howto_table[R_386_32];
210
211 case BFD_RELOC_CTOR:
212 TRACE ("BFD_RELOC_CTOR");
213 return &elf_howto_table[R_386_32];
214
215 case BFD_RELOC_32_PCREL:
216 TRACE ("BFD_RELOC_PC32");
217 return &elf_howto_table[R_386_PC32];
218
219 case BFD_RELOC_386_GOT32:
220 TRACE ("BFD_RELOC_386_GOT32");
221 return &elf_howto_table[R_386_GOT32];
222
223 case BFD_RELOC_386_PLT32:
224 TRACE ("BFD_RELOC_386_PLT32");
225 return &elf_howto_table[R_386_PLT32];
226
227 case BFD_RELOC_386_COPY:
228 TRACE ("BFD_RELOC_386_COPY");
229 return &elf_howto_table[R_386_COPY];
230
231 case BFD_RELOC_386_GLOB_DAT:
232 TRACE ("BFD_RELOC_386_GLOB_DAT");
233 return &elf_howto_table[R_386_GLOB_DAT];
234
235 case BFD_RELOC_386_JUMP_SLOT:
236 TRACE ("BFD_RELOC_386_JUMP_SLOT");
237 return &elf_howto_table[R_386_JUMP_SLOT];
238
239 case BFD_RELOC_386_RELATIVE:
240 TRACE ("BFD_RELOC_386_RELATIVE");
241 return &elf_howto_table[R_386_RELATIVE];
242
243 case BFD_RELOC_386_GOTOFF:
244 TRACE ("BFD_RELOC_386_GOTOFF");
245 return &elf_howto_table[R_386_GOTOFF];
246
247 case BFD_RELOC_386_GOTPC:
248 TRACE ("BFD_RELOC_386_GOTPC");
249 return &elf_howto_table[R_386_GOTPC];
250
251 /* These relocs are a GNU extension. */
252 case BFD_RELOC_386_TLS_TPOFF:
253 TRACE ("BFD_RELOC_386_TLS_TPOFF");
254 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_IE:
257 TRACE ("BFD_RELOC_386_TLS_IE");
258 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_GOTIE:
261 TRACE ("BFD_RELOC_386_TLS_GOTIE");
262 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_LE:
265 TRACE ("BFD_RELOC_386_TLS_LE");
266 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
267
268 case BFD_RELOC_386_TLS_GD:
269 TRACE ("BFD_RELOC_386_TLS_GD");
270 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
271
272 case BFD_RELOC_386_TLS_LDM:
273 TRACE ("BFD_RELOC_386_TLS_LDM");
274 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
275
276 case BFD_RELOC_16:
277 TRACE ("BFD_RELOC_16");
278 return &elf_howto_table[R_386_16 - R_386_ext_offset];
279
280 case BFD_RELOC_16_PCREL:
281 TRACE ("BFD_RELOC_16_PCREL");
282 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
283
284 case BFD_RELOC_8:
285 TRACE ("BFD_RELOC_8");
286 return &elf_howto_table[R_386_8 - R_386_ext_offset];
287
288 case BFD_RELOC_8_PCREL:
289 TRACE ("BFD_RELOC_8_PCREL");
290 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
291
292 /* Common with Sun TLS implementation. */
293 case BFD_RELOC_386_TLS_LDO_32:
294 TRACE ("BFD_RELOC_386_TLS_LDO_32");
295 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_IE_32:
298 TRACE ("BFD_RELOC_386_TLS_IE_32");
299 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_LE_32:
302 TRACE ("BFD_RELOC_386_TLS_LE_32");
303 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_DTPMOD32:
306 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
307 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
308
309 case BFD_RELOC_386_TLS_DTPOFF32:
310 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
311 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_TPOFF32:
314 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
315 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
316
317 case BFD_RELOC_SIZE32:
318 TRACE ("BFD_RELOC_SIZE32");
319 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_GOTDESC:
322 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
323 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_TLS_DESC_CALL:
326 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
327 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
328
329 case BFD_RELOC_386_TLS_DESC:
330 TRACE ("BFD_RELOC_386_TLS_DESC");
331 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
332
333 case BFD_RELOC_386_IRELATIVE:
334 TRACE ("BFD_RELOC_386_IRELATIVE");
335 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
336
337 case BFD_RELOC_VTABLE_INHERIT:
338 TRACE ("BFD_RELOC_VTABLE_INHERIT");
339 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
340
341 case BFD_RELOC_VTABLE_ENTRY:
342 TRACE ("BFD_RELOC_VTABLE_ENTRY");
343 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
344
345 default:
346 break;
347 }
348
349 TRACE ("Unknown");
350 return 0;
351 }
352
353 static reloc_howto_type *
354 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
355 const char *r_name)
356 {
357 unsigned int i;
358
359 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
360 if (elf_howto_table[i].name != NULL
361 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
362 return &elf_howto_table[i];
363
364 return NULL;
365 }
366
367 static reloc_howto_type *
368 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
369 {
370 unsigned int indx;
371
372 if ((indx = r_type) >= R_386_standard
373 && ((indx = r_type - R_386_ext_offset) - R_386_standard
374 >= R_386_ext - R_386_standard)
375 && ((indx = r_type - R_386_tls_offset) - R_386_ext
376 >= R_386_irelative - R_386_ext)
377 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
378 >= R_386_vt - R_386_irelative))
379 {
380 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
381 abfd, (int) r_type);
382 indx = R_386_NONE;
383 }
384 BFD_ASSERT (elf_howto_table [indx].type == r_type);
385 return &elf_howto_table[indx];
386 }
387
388 static void
389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392 {
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395 }
396
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403 static bfd_boolean
404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411 \f
412 /* Support for core dump NOTE sections. */
413
414 static bfd_boolean
415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416 {
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462 }
463
464 static bfd_boolean
465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466 {
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
474 elf_tdata (abfd)->core->program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core->command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core->pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core->program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core->command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
493 }
494 }
495
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
499 {
500 char *command = elf_tdata (abfd)->core->command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508 }
509 \f
510 /* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
522
523
524 /* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
532 shared lib. */
533 #define ELIMINATE_COPY_RELOCS 1
534
535 /* The size in bytes of an entry in the procedure linkage table. */
536
537 #define PLT_ENTRY_SIZE 16
538
539 /* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
542
543 static const bfd_byte elf_i386_plt0_entry[12] =
544 {
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
549 };
550
551 /* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
562 };
563
564 /* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
574
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
583 };
584
585 /* .eh_frame covering the .plt section. */
586
587 static const bfd_byte elf_i386_eh_frame_plt[] =
588 {
589 #define PLT_CIE_LENGTH 20
590 #define PLT_FDE_LENGTH 36
591 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
592 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
593 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
594 0, 0, 0, 0, /* CIE ID */
595 1, /* CIE version */
596 'z', 'R', 0, /* Augmentation string */
597 1, /* Code alignment factor */
598 0x7c, /* Data alignment factor */
599 8, /* Return address column */
600 1, /* Augmentation size */
601 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
602 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
603 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
604 DW_CFA_nop, DW_CFA_nop,
605
606 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
607 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
608 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
609 0, 0, 0, 0, /* .plt size goes here */
610 0, /* Augmentation size */
611 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
612 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
613 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
614 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
615 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
616 11, /* Block length */
617 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
618 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
619 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
620 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
621 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
622 };
623
624 struct elf_i386_plt_layout
625 {
626 /* The first entry in an absolute procedure linkage table looks like this. */
627 const bfd_byte *plt0_entry;
628 unsigned int plt0_entry_size;
629
630 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
631 unsigned int plt0_got1_offset;
632 unsigned int plt0_got2_offset;
633
634 /* Later entries in an absolute procedure linkage table look like this. */
635 const bfd_byte *plt_entry;
636 unsigned int plt_entry_size;
637
638 /* Offsets into plt_entry that are to be replaced with... */
639 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
640 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
641 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
642
643 /* Offset into plt_entry where the initial value of the GOT entry points. */
644 unsigned int plt_lazy_offset;
645
646 /* The first entry in a PIC procedure linkage table looks like this. */
647 const bfd_byte *pic_plt0_entry;
648
649 /* Subsequent entries in a PIC procedure linkage table look like this. */
650 const bfd_byte *pic_plt_entry;
651
652 /* .eh_frame covering the .plt section. */
653 const bfd_byte *eh_frame_plt;
654 unsigned int eh_frame_plt_size;
655 };
656
657 #define GET_PLT_ENTRY_SIZE(abfd) \
658 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
659
660 /* These are the standard parameters. */
661 static const struct elf_i386_plt_layout elf_i386_plt =
662 {
663 elf_i386_plt0_entry, /* plt0_entry */
664 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
665 2, /* plt0_got1_offset */
666 8, /* plt0_got2_offset */
667 elf_i386_plt_entry, /* plt_entry */
668 PLT_ENTRY_SIZE, /* plt_entry_size */
669 2, /* plt_got_offset */
670 7, /* plt_reloc_offset */
671 12, /* plt_plt_offset */
672 6, /* plt_lazy_offset */
673 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
674 elf_i386_pic_plt_entry, /* pic_plt_entry */
675 elf_i386_eh_frame_plt, /* eh_frame_plt */
676 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
677 };
678 \f
679
680 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
681 for the PLTResolve stub and then for each PLT entry. */
682 #define PLTRESOLVE_RELOCS_SHLIB 0
683 #define PLTRESOLVE_RELOCS 2
684 #define PLT_NON_JUMP_SLOT_RELOCS 2
685
686 /* Architecture-specific backend data for i386. */
687
688 struct elf_i386_backend_data
689 {
690 /* Parameters describing PLT generation. */
691 const struct elf_i386_plt_layout *plt;
692
693 /* Value used to fill the unused bytes of the first PLT entry. */
694 bfd_byte plt0_pad_byte;
695
696 /* True if the target system is VxWorks. */
697 int is_vxworks;
698 };
699
700 #define get_elf_i386_backend_data(abfd) \
701 ((const struct elf_i386_backend_data *) \
702 get_elf_backend_data (abfd)->arch_data)
703
704 /* These are the standard parameters. */
705 static const struct elf_i386_backend_data elf_i386_arch_bed =
706 {
707 &elf_i386_plt, /* plt */
708 0, /* plt0_pad_byte */
709 0, /* is_vxworks */
710 };
711
712 #define elf_backend_arch_data &elf_i386_arch_bed
713
714 /* i386 ELF linker hash entry. */
715
716 struct elf_i386_link_hash_entry
717 {
718 struct elf_link_hash_entry elf;
719
720 /* Track dynamic relocs copied for this symbol. */
721 struct elf_dyn_relocs *dyn_relocs;
722
723 #define GOT_UNKNOWN 0
724 #define GOT_NORMAL 1
725 #define GOT_TLS_GD 2
726 #define GOT_TLS_IE 4
727 #define GOT_TLS_IE_POS 5
728 #define GOT_TLS_IE_NEG 6
729 #define GOT_TLS_IE_BOTH 7
730 #define GOT_TLS_GDESC 8
731 #define GOT_TLS_GD_BOTH_P(type) \
732 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
733 #define GOT_TLS_GD_P(type) \
734 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
735 #define GOT_TLS_GDESC_P(type) \
736 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
737 #define GOT_TLS_GD_ANY_P(type) \
738 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
739 unsigned char tls_type;
740
741 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
742 starting at the end of the jump table. */
743 bfd_vma tlsdesc_got;
744 };
745
746 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
747
748 struct elf_i386_obj_tdata
749 {
750 struct elf_obj_tdata root;
751
752 /* tls_type for each local got entry. */
753 char *local_got_tls_type;
754
755 /* GOTPLT entries for TLS descriptors. */
756 bfd_vma *local_tlsdesc_gotent;
757 };
758
759 #define elf_i386_tdata(abfd) \
760 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
761
762 #define elf_i386_local_got_tls_type(abfd) \
763 (elf_i386_tdata (abfd)->local_got_tls_type)
764
765 #define elf_i386_local_tlsdesc_gotent(abfd) \
766 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
767
768 #define is_i386_elf(bfd) \
769 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
770 && elf_tdata (bfd) != NULL \
771 && elf_object_id (bfd) == I386_ELF_DATA)
772
773 static bfd_boolean
774 elf_i386_mkobject (bfd *abfd)
775 {
776 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
777 I386_ELF_DATA);
778 }
779
780 /* i386 ELF linker hash table. */
781
782 struct elf_i386_link_hash_table
783 {
784 struct elf_link_hash_table elf;
785
786 /* Short-cuts to get to dynamic linker sections. */
787 asection *sdynbss;
788 asection *srelbss;
789 asection *plt_eh_frame;
790
791 union
792 {
793 bfd_signed_vma refcount;
794 bfd_vma offset;
795 } tls_ldm_got;
796
797 /* The amount of space used by the reserved portion of the sgotplt
798 section, plus whatever space is used by the jump slots. */
799 bfd_vma sgotplt_jump_table_size;
800
801 /* Small local sym cache. */
802 struct sym_cache sym_cache;
803
804 /* _TLS_MODULE_BASE_ symbol. */
805 struct bfd_link_hash_entry *tls_module_base;
806
807 /* Used by local STT_GNU_IFUNC symbols. */
808 htab_t loc_hash_table;
809 void * loc_hash_memory;
810
811 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
812 asection *srelplt2;
813
814 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
815 bfd_vma next_tls_desc_index;
816
817 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
818 bfd_vma next_jump_slot_index;
819
820 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
821 bfd_vma next_irelative_index;
822 };
823
824 /* Get the i386 ELF linker hash table from a link_info structure. */
825
826 #define elf_i386_hash_table(p) \
827 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
828 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
829
830 #define elf_i386_compute_jump_table_size(htab) \
831 ((htab)->next_tls_desc_index * 4)
832
833 /* Create an entry in an i386 ELF linker hash table. */
834
835 static struct bfd_hash_entry *
836 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
837 struct bfd_hash_table *table,
838 const char *string)
839 {
840 /* Allocate the structure if it has not already been allocated by a
841 subclass. */
842 if (entry == NULL)
843 {
844 entry = (struct bfd_hash_entry *)
845 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
846 if (entry == NULL)
847 return entry;
848 }
849
850 /* Call the allocation method of the superclass. */
851 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
852 if (entry != NULL)
853 {
854 struct elf_i386_link_hash_entry *eh;
855
856 eh = (struct elf_i386_link_hash_entry *) entry;
857 eh->dyn_relocs = NULL;
858 eh->tls_type = GOT_UNKNOWN;
859 eh->tlsdesc_got = (bfd_vma) -1;
860 }
861
862 return entry;
863 }
864
865 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
866 for local symbol so that we can handle local STT_GNU_IFUNC symbols
867 as global symbol. We reuse indx and dynstr_index for local symbol
868 hash since they aren't used by global symbols in this backend. */
869
870 static hashval_t
871 elf_i386_local_htab_hash (const void *ptr)
872 {
873 struct elf_link_hash_entry *h
874 = (struct elf_link_hash_entry *) ptr;
875 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
876 }
877
878 /* Compare local hash entries. */
879
880 static int
881 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
882 {
883 struct elf_link_hash_entry *h1
884 = (struct elf_link_hash_entry *) ptr1;
885 struct elf_link_hash_entry *h2
886 = (struct elf_link_hash_entry *) ptr2;
887
888 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
889 }
890
891 /* Find and/or create a hash entry for local symbol. */
892
893 static struct elf_link_hash_entry *
894 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
895 bfd *abfd, const Elf_Internal_Rela *rel,
896 bfd_boolean create)
897 {
898 struct elf_i386_link_hash_entry e, *ret;
899 asection *sec = abfd->sections;
900 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
901 ELF32_R_SYM (rel->r_info));
902 void **slot;
903
904 e.elf.indx = sec->id;
905 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
906 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
907 create ? INSERT : NO_INSERT);
908
909 if (!slot)
910 return NULL;
911
912 if (*slot)
913 {
914 ret = (struct elf_i386_link_hash_entry *) *slot;
915 return &ret->elf;
916 }
917
918 ret = (struct elf_i386_link_hash_entry *)
919 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
920 sizeof (struct elf_i386_link_hash_entry));
921 if (ret)
922 {
923 memset (ret, 0, sizeof (*ret));
924 ret->elf.indx = sec->id;
925 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
926 ret->elf.dynindx = -1;
927 *slot = ret;
928 }
929 return &ret->elf;
930 }
931
932 /* Create an i386 ELF linker hash table. */
933
934 static struct bfd_link_hash_table *
935 elf_i386_link_hash_table_create (bfd *abfd)
936 {
937 struct elf_i386_link_hash_table *ret;
938 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
939
940 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
941 if (ret == NULL)
942 return NULL;
943
944 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
945 elf_i386_link_hash_newfunc,
946 sizeof (struct elf_i386_link_hash_entry),
947 I386_ELF_DATA))
948 {
949 free (ret);
950 return NULL;
951 }
952
953 ret->loc_hash_table = htab_try_create (1024,
954 elf_i386_local_htab_hash,
955 elf_i386_local_htab_eq,
956 NULL);
957 ret->loc_hash_memory = objalloc_create ();
958 if (!ret->loc_hash_table || !ret->loc_hash_memory)
959 {
960 free (ret);
961 return NULL;
962 }
963
964 return &ret->elf.root;
965 }
966
967 /* Destroy an i386 ELF linker hash table. */
968
969 static void
970 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
971 {
972 struct elf_i386_link_hash_table *htab
973 = (struct elf_i386_link_hash_table *) hash;
974
975 if (htab->loc_hash_table)
976 htab_delete (htab->loc_hash_table);
977 if (htab->loc_hash_memory)
978 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
979 _bfd_elf_link_hash_table_free (hash);
980 }
981
982 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
983 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
984 hash table. */
985
986 static bfd_boolean
987 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
988 {
989 struct elf_i386_link_hash_table *htab;
990
991 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
992 return FALSE;
993
994 htab = elf_i386_hash_table (info);
995 if (htab == NULL)
996 return FALSE;
997
998 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
999 if (!info->shared)
1000 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1001
1002 if (!htab->sdynbss
1003 || (!info->shared && !htab->srelbss))
1004 abort ();
1005
1006 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1007 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1008 &htab->srelplt2))
1009 return FALSE;
1010
1011 if (!info->no_ld_generated_unwind_info
1012 && htab->plt_eh_frame == NULL
1013 && htab->elf.splt != NULL)
1014 {
1015 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1016 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1017 | SEC_LINKER_CREATED);
1018 htab->plt_eh_frame
1019 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1020 if (htab->plt_eh_frame == NULL
1021 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1022 return FALSE;
1023 }
1024
1025 return TRUE;
1026 }
1027
1028 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1029
1030 static void
1031 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1032 struct elf_link_hash_entry *dir,
1033 struct elf_link_hash_entry *ind)
1034 {
1035 struct elf_i386_link_hash_entry *edir, *eind;
1036
1037 edir = (struct elf_i386_link_hash_entry *) dir;
1038 eind = (struct elf_i386_link_hash_entry *) ind;
1039
1040 if (eind->dyn_relocs != NULL)
1041 {
1042 if (edir->dyn_relocs != NULL)
1043 {
1044 struct elf_dyn_relocs **pp;
1045 struct elf_dyn_relocs *p;
1046
1047 /* Add reloc counts against the indirect sym to the direct sym
1048 list. Merge any entries against the same section. */
1049 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1050 {
1051 struct elf_dyn_relocs *q;
1052
1053 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1054 if (q->sec == p->sec)
1055 {
1056 q->pc_count += p->pc_count;
1057 q->count += p->count;
1058 *pp = p->next;
1059 break;
1060 }
1061 if (q == NULL)
1062 pp = &p->next;
1063 }
1064 *pp = edir->dyn_relocs;
1065 }
1066
1067 edir->dyn_relocs = eind->dyn_relocs;
1068 eind->dyn_relocs = NULL;
1069 }
1070
1071 if (ind->root.type == bfd_link_hash_indirect
1072 && dir->got.refcount <= 0)
1073 {
1074 edir->tls_type = eind->tls_type;
1075 eind->tls_type = GOT_UNKNOWN;
1076 }
1077
1078 if (ELIMINATE_COPY_RELOCS
1079 && ind->root.type != bfd_link_hash_indirect
1080 && dir->dynamic_adjusted)
1081 {
1082 /* If called to transfer flags for a weakdef during processing
1083 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1084 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1085 dir->ref_dynamic |= ind->ref_dynamic;
1086 dir->ref_regular |= ind->ref_regular;
1087 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1088 dir->needs_plt |= ind->needs_plt;
1089 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1090 }
1091 else
1092 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1093 }
1094
1095 /* Return TRUE if the TLS access code sequence support transition
1096 from R_TYPE. */
1097
1098 static bfd_boolean
1099 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1100 bfd_byte *contents,
1101 Elf_Internal_Shdr *symtab_hdr,
1102 struct elf_link_hash_entry **sym_hashes,
1103 unsigned int r_type,
1104 const Elf_Internal_Rela *rel,
1105 const Elf_Internal_Rela *relend)
1106 {
1107 unsigned int val, type;
1108 unsigned long r_symndx;
1109 struct elf_link_hash_entry *h;
1110 bfd_vma offset;
1111
1112 /* Get the section contents. */
1113 if (contents == NULL)
1114 {
1115 if (elf_section_data (sec)->this_hdr.contents != NULL)
1116 contents = elf_section_data (sec)->this_hdr.contents;
1117 else
1118 {
1119 /* FIXME: How to better handle error condition? */
1120 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1121 return FALSE;
1122
1123 /* Cache the section contents for elf_link_input_bfd. */
1124 elf_section_data (sec)->this_hdr.contents = contents;
1125 }
1126 }
1127
1128 offset = rel->r_offset;
1129 switch (r_type)
1130 {
1131 case R_386_TLS_GD:
1132 case R_386_TLS_LDM:
1133 if (offset < 2 || (rel + 1) >= relend)
1134 return FALSE;
1135
1136 type = bfd_get_8 (abfd, contents + offset - 2);
1137 if (r_type == R_386_TLS_GD)
1138 {
1139 /* Check transition from GD access model. Only
1140 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1141 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1142 can transit to different access model. */
1143 if ((offset + 10) > sec->size ||
1144 (type != 0x8d && type != 0x04))
1145 return FALSE;
1146
1147 val = bfd_get_8 (abfd, contents + offset - 1);
1148 if (type == 0x04)
1149 {
1150 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1151 if (offset < 3)
1152 return FALSE;
1153
1154 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1155 return FALSE;
1156
1157 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1158 return FALSE;
1159 }
1160 else
1161 {
1162 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1163 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1164 return FALSE;
1165
1166 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1167 return FALSE;
1168 }
1169 }
1170 else
1171 {
1172 /* Check transition from LD access model. Only
1173 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1174 can transit to different access model. */
1175 if (type != 0x8d || (offset + 9) > sec->size)
1176 return FALSE;
1177
1178 val = bfd_get_8 (abfd, contents + offset - 1);
1179 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1180 return FALSE;
1181 }
1182
1183 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1184 return FALSE;
1185
1186 r_symndx = ELF32_R_SYM (rel[1].r_info);
1187 if (r_symndx < symtab_hdr->sh_info)
1188 return FALSE;
1189
1190 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1191 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1192 may be versioned. */
1193 return (h != NULL
1194 && h->root.root.string != NULL
1195 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1196 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1197 && (strncmp (h->root.root.string, "___tls_get_addr",
1198 15) == 0));
1199
1200 case R_386_TLS_IE:
1201 /* Check transition from IE access model:
1202 movl foo@indntpoff(%rip), %eax
1203 movl foo@indntpoff(%rip), %reg
1204 addl foo@indntpoff(%rip), %reg
1205 */
1206
1207 if (offset < 1 || (offset + 4) > sec->size)
1208 return FALSE;
1209
1210 /* Check "movl foo@tpoff(%rip), %eax" first. */
1211 val = bfd_get_8 (abfd, contents + offset - 1);
1212 if (val == 0xa1)
1213 return TRUE;
1214
1215 if (offset < 2)
1216 return FALSE;
1217
1218 /* Check movl|addl foo@tpoff(%rip), %reg. */
1219 type = bfd_get_8 (abfd, contents + offset - 2);
1220 return ((type == 0x8b || type == 0x03)
1221 && (val & 0xc7) == 0x05);
1222
1223 case R_386_TLS_GOTIE:
1224 case R_386_TLS_IE_32:
1225 /* Check transition from {IE_32,GOTIE} access model:
1226 subl foo@{tpoff,gontoff}(%reg1), %reg2
1227 movl foo@{tpoff,gontoff}(%reg1), %reg2
1228 addl foo@{tpoff,gontoff}(%reg1), %reg2
1229 */
1230
1231 if (offset < 2 || (offset + 4) > sec->size)
1232 return FALSE;
1233
1234 val = bfd_get_8 (abfd, contents + offset - 1);
1235 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1236 return FALSE;
1237
1238 type = bfd_get_8 (abfd, contents + offset - 2);
1239 return type == 0x8b || type == 0x2b || type == 0x03;
1240
1241 case R_386_TLS_GOTDESC:
1242 /* Check transition from GDesc access model:
1243 leal x@tlsdesc(%ebx), %eax
1244
1245 Make sure it's a leal adding ebx to a 32-bit offset
1246 into any register, although it's probably almost always
1247 going to be eax. */
1248
1249 if (offset < 2 || (offset + 4) > sec->size)
1250 return FALSE;
1251
1252 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1253 return FALSE;
1254
1255 val = bfd_get_8 (abfd, contents + offset - 1);
1256 return (val & 0xc7) == 0x83;
1257
1258 case R_386_TLS_DESC_CALL:
1259 /* Check transition from GDesc access model:
1260 call *x@tlsdesc(%rax)
1261 */
1262 if (offset + 2 <= sec->size)
1263 {
1264 /* Make sure that it's a call *x@tlsdesc(%rax). */
1265 static const unsigned char call[] = { 0xff, 0x10 };
1266 return memcmp (contents + offset, call, 2) == 0;
1267 }
1268
1269 return FALSE;
1270
1271 default:
1272 abort ();
1273 }
1274 }
1275
1276 /* Return TRUE if the TLS access transition is OK or no transition
1277 will be performed. Update R_TYPE if there is a transition. */
1278
1279 static bfd_boolean
1280 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1281 asection *sec, bfd_byte *contents,
1282 Elf_Internal_Shdr *symtab_hdr,
1283 struct elf_link_hash_entry **sym_hashes,
1284 unsigned int *r_type, int tls_type,
1285 const Elf_Internal_Rela *rel,
1286 const Elf_Internal_Rela *relend,
1287 struct elf_link_hash_entry *h,
1288 unsigned long r_symndx)
1289 {
1290 unsigned int from_type = *r_type;
1291 unsigned int to_type = from_type;
1292 bfd_boolean check = TRUE;
1293
1294 /* Skip TLS transition for functions. */
1295 if (h != NULL
1296 && (h->type == STT_FUNC
1297 || h->type == STT_GNU_IFUNC))
1298 return TRUE;
1299
1300 switch (from_type)
1301 {
1302 case R_386_TLS_GD:
1303 case R_386_TLS_GOTDESC:
1304 case R_386_TLS_DESC_CALL:
1305 case R_386_TLS_IE_32:
1306 case R_386_TLS_IE:
1307 case R_386_TLS_GOTIE:
1308 if (info->executable)
1309 {
1310 if (h == NULL)
1311 to_type = R_386_TLS_LE_32;
1312 else if (from_type != R_386_TLS_IE
1313 && from_type != R_386_TLS_GOTIE)
1314 to_type = R_386_TLS_IE_32;
1315 }
1316
1317 /* When we are called from elf_i386_relocate_section, CONTENTS
1318 isn't NULL and there may be additional transitions based on
1319 TLS_TYPE. */
1320 if (contents != NULL)
1321 {
1322 unsigned int new_to_type = to_type;
1323
1324 if (info->executable
1325 && h != NULL
1326 && h->dynindx == -1
1327 && (tls_type & GOT_TLS_IE))
1328 new_to_type = R_386_TLS_LE_32;
1329
1330 if (to_type == R_386_TLS_GD
1331 || to_type == R_386_TLS_GOTDESC
1332 || to_type == R_386_TLS_DESC_CALL)
1333 {
1334 if (tls_type == GOT_TLS_IE_POS)
1335 new_to_type = R_386_TLS_GOTIE;
1336 else if (tls_type & GOT_TLS_IE)
1337 new_to_type = R_386_TLS_IE_32;
1338 }
1339
1340 /* We checked the transition before when we were called from
1341 elf_i386_check_relocs. We only want to check the new
1342 transition which hasn't been checked before. */
1343 check = new_to_type != to_type && from_type == to_type;
1344 to_type = new_to_type;
1345 }
1346
1347 break;
1348
1349 case R_386_TLS_LDM:
1350 if (info->executable)
1351 to_type = R_386_TLS_LE_32;
1352 break;
1353
1354 default:
1355 return TRUE;
1356 }
1357
1358 /* Return TRUE if there is no transition. */
1359 if (from_type == to_type)
1360 return TRUE;
1361
1362 /* Check if the transition can be performed. */
1363 if (check
1364 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1365 symtab_hdr, sym_hashes,
1366 from_type, rel, relend))
1367 {
1368 reloc_howto_type *from, *to;
1369 const char *name;
1370
1371 from = elf_i386_rtype_to_howto (abfd, from_type);
1372 to = elf_i386_rtype_to_howto (abfd, to_type);
1373
1374 if (h)
1375 name = h->root.root.string;
1376 else
1377 {
1378 struct elf_i386_link_hash_table *htab;
1379
1380 htab = elf_i386_hash_table (info);
1381 if (htab == NULL)
1382 name = "*unknown*";
1383 else
1384 {
1385 Elf_Internal_Sym *isym;
1386
1387 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1388 abfd, r_symndx);
1389 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1390 }
1391 }
1392
1393 (*_bfd_error_handler)
1394 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1395 "in section `%A' failed"),
1396 abfd, sec, from->name, to->name, name,
1397 (unsigned long) rel->r_offset);
1398 bfd_set_error (bfd_error_bad_value);
1399 return FALSE;
1400 }
1401
1402 *r_type = to_type;
1403 return TRUE;
1404 }
1405
1406 /* Look through the relocs for a section during the first phase, and
1407 calculate needed space in the global offset table, procedure linkage
1408 table, and dynamic reloc sections. */
1409
1410 static bfd_boolean
1411 elf_i386_check_relocs (bfd *abfd,
1412 struct bfd_link_info *info,
1413 asection *sec,
1414 const Elf_Internal_Rela *relocs)
1415 {
1416 struct elf_i386_link_hash_table *htab;
1417 Elf_Internal_Shdr *symtab_hdr;
1418 struct elf_link_hash_entry **sym_hashes;
1419 const Elf_Internal_Rela *rel;
1420 const Elf_Internal_Rela *rel_end;
1421 asection *sreloc;
1422
1423 if (info->relocatable)
1424 return TRUE;
1425
1426 BFD_ASSERT (is_i386_elf (abfd));
1427
1428 htab = elf_i386_hash_table (info);
1429 if (htab == NULL)
1430 return FALSE;
1431
1432 symtab_hdr = &elf_symtab_hdr (abfd);
1433 sym_hashes = elf_sym_hashes (abfd);
1434
1435 sreloc = NULL;
1436
1437 rel_end = relocs + sec->reloc_count;
1438 for (rel = relocs; rel < rel_end; rel++)
1439 {
1440 unsigned int r_type;
1441 unsigned long r_symndx;
1442 struct elf_link_hash_entry *h;
1443 Elf_Internal_Sym *isym;
1444 const char *name;
1445 bfd_boolean size_reloc;
1446
1447 r_symndx = ELF32_R_SYM (rel->r_info);
1448 r_type = ELF32_R_TYPE (rel->r_info);
1449
1450 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1451 {
1452 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1453 abfd,
1454 r_symndx);
1455 return FALSE;
1456 }
1457
1458 if (r_symndx < symtab_hdr->sh_info)
1459 {
1460 /* A local symbol. */
1461 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1462 abfd, r_symndx);
1463 if (isym == NULL)
1464 return FALSE;
1465
1466 /* Check relocation against local STT_GNU_IFUNC symbol. */
1467 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1468 {
1469 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1470 if (h == NULL)
1471 return FALSE;
1472
1473 /* Fake a STT_GNU_IFUNC symbol. */
1474 h->type = STT_GNU_IFUNC;
1475 h->def_regular = 1;
1476 h->ref_regular = 1;
1477 h->forced_local = 1;
1478 h->root.type = bfd_link_hash_defined;
1479 }
1480 else
1481 h = NULL;
1482 }
1483 else
1484 {
1485 isym = NULL;
1486 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1487 while (h->root.type == bfd_link_hash_indirect
1488 || h->root.type == bfd_link_hash_warning)
1489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1490 }
1491
1492 if (h != NULL)
1493 {
1494 /* Create the ifunc sections for static executables. If we
1495 never see an indirect function symbol nor we are building
1496 a static executable, those sections will be empty and
1497 won't appear in output. */
1498 switch (r_type)
1499 {
1500 default:
1501 break;
1502
1503 case R_386_32:
1504 case R_386_PC32:
1505 case R_386_PLT32:
1506 case R_386_GOT32:
1507 case R_386_GOTOFF:
1508 if (htab->elf.dynobj == NULL)
1509 htab->elf.dynobj = abfd;
1510 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1511 return FALSE;
1512 break;
1513 }
1514
1515 /* It is referenced by a non-shared object. */
1516 h->ref_regular = 1;
1517 h->root.non_ir_ref = 1;
1518 }
1519
1520 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1521 symtab_hdr, sym_hashes,
1522 &r_type, GOT_UNKNOWN,
1523 rel, rel_end, h, r_symndx))
1524 return FALSE;
1525
1526 switch (r_type)
1527 {
1528 case R_386_TLS_LDM:
1529 htab->tls_ldm_got.refcount += 1;
1530 goto create_got;
1531
1532 case R_386_PLT32:
1533 /* This symbol requires a procedure linkage table entry. We
1534 actually build the entry in adjust_dynamic_symbol,
1535 because this might be a case of linking PIC code which is
1536 never referenced by a dynamic object, in which case we
1537 don't need to generate a procedure linkage table entry
1538 after all. */
1539
1540 /* If this is a local symbol, we resolve it directly without
1541 creating a procedure linkage table entry. */
1542 if (h == NULL)
1543 continue;
1544
1545 h->needs_plt = 1;
1546 h->plt.refcount += 1;
1547 break;
1548
1549 case R_386_SIZE32:
1550 size_reloc = TRUE;
1551 goto do_size;
1552
1553 case R_386_TLS_IE_32:
1554 case R_386_TLS_IE:
1555 case R_386_TLS_GOTIE:
1556 if (!info->executable)
1557 info->flags |= DF_STATIC_TLS;
1558 /* Fall through */
1559
1560 case R_386_GOT32:
1561 case R_386_TLS_GD:
1562 case R_386_TLS_GOTDESC:
1563 case R_386_TLS_DESC_CALL:
1564 /* This symbol requires a global offset table entry. */
1565 {
1566 int tls_type, old_tls_type;
1567
1568 switch (r_type)
1569 {
1570 default:
1571 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1572 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1573 case R_386_TLS_GOTDESC:
1574 case R_386_TLS_DESC_CALL:
1575 tls_type = GOT_TLS_GDESC; break;
1576 case R_386_TLS_IE_32:
1577 if (ELF32_R_TYPE (rel->r_info) == r_type)
1578 tls_type = GOT_TLS_IE_NEG;
1579 else
1580 /* If this is a GD->IE transition, we may use either of
1581 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1582 tls_type = GOT_TLS_IE;
1583 break;
1584 case R_386_TLS_IE:
1585 case R_386_TLS_GOTIE:
1586 tls_type = GOT_TLS_IE_POS; break;
1587 }
1588
1589 if (h != NULL)
1590 {
1591 h->got.refcount += 1;
1592 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1593 }
1594 else
1595 {
1596 bfd_signed_vma *local_got_refcounts;
1597
1598 /* This is a global offset table entry for a local symbol. */
1599 local_got_refcounts = elf_local_got_refcounts (abfd);
1600 if (local_got_refcounts == NULL)
1601 {
1602 bfd_size_type size;
1603
1604 size = symtab_hdr->sh_info;
1605 size *= (sizeof (bfd_signed_vma)
1606 + sizeof (bfd_vma) + sizeof(char));
1607 local_got_refcounts = (bfd_signed_vma *)
1608 bfd_zalloc (abfd, size);
1609 if (local_got_refcounts == NULL)
1610 return FALSE;
1611 elf_local_got_refcounts (abfd) = local_got_refcounts;
1612 elf_i386_local_tlsdesc_gotent (abfd)
1613 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1614 elf_i386_local_got_tls_type (abfd)
1615 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1616 }
1617 local_got_refcounts[r_symndx] += 1;
1618 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1619 }
1620
1621 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1622 tls_type |= old_tls_type;
1623 /* If a TLS symbol is accessed using IE at least once,
1624 there is no point to use dynamic model for it. */
1625 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1626 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1627 || (tls_type & GOT_TLS_IE) == 0))
1628 {
1629 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1630 tls_type = old_tls_type;
1631 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1632 && GOT_TLS_GD_ANY_P (tls_type))
1633 tls_type |= old_tls_type;
1634 else
1635 {
1636 if (h)
1637 name = h->root.root.string;
1638 else
1639 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1640 NULL);
1641 (*_bfd_error_handler)
1642 (_("%B: `%s' accessed both as normal and "
1643 "thread local symbol"),
1644 abfd, name);
1645 bfd_set_error (bfd_error_bad_value);
1646 return FALSE;
1647 }
1648 }
1649
1650 if (old_tls_type != tls_type)
1651 {
1652 if (h != NULL)
1653 elf_i386_hash_entry (h)->tls_type = tls_type;
1654 else
1655 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1656 }
1657 }
1658 /* Fall through */
1659
1660 case R_386_GOTOFF:
1661 case R_386_GOTPC:
1662 create_got:
1663 if (htab->elf.sgot == NULL)
1664 {
1665 if (htab->elf.dynobj == NULL)
1666 htab->elf.dynobj = abfd;
1667 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1668 return FALSE;
1669 }
1670 if (r_type != R_386_TLS_IE)
1671 break;
1672 /* Fall through */
1673
1674 case R_386_TLS_LE_32:
1675 case R_386_TLS_LE:
1676 if (info->executable)
1677 break;
1678 info->flags |= DF_STATIC_TLS;
1679 /* Fall through */
1680
1681 case R_386_32:
1682 case R_386_PC32:
1683 if (h != NULL && info->executable)
1684 {
1685 /* If this reloc is in a read-only section, we might
1686 need a copy reloc. We can't check reliably at this
1687 stage whether the section is read-only, as input
1688 sections have not yet been mapped to output sections.
1689 Tentatively set the flag for now, and correct in
1690 adjust_dynamic_symbol. */
1691 h->non_got_ref = 1;
1692
1693 /* We may need a .plt entry if the function this reloc
1694 refers to is in a shared lib. */
1695 h->plt.refcount += 1;
1696 if (r_type != R_386_PC32)
1697 h->pointer_equality_needed = 1;
1698 }
1699
1700 size_reloc = FALSE;
1701 do_size:
1702 /* If we are creating a shared library, and this is a reloc
1703 against a global symbol, or a non PC relative reloc
1704 against a local symbol, then we need to copy the reloc
1705 into the shared library. However, if we are linking with
1706 -Bsymbolic, we do not need to copy a reloc against a
1707 global symbol which is defined in an object we are
1708 including in the link (i.e., DEF_REGULAR is set). At
1709 this point we have not seen all the input files, so it is
1710 possible that DEF_REGULAR is not set now but will be set
1711 later (it is never cleared). In case of a weak definition,
1712 DEF_REGULAR may be cleared later by a strong definition in
1713 a shared library. We account for that possibility below by
1714 storing information in the relocs_copied field of the hash
1715 table entry. A similar situation occurs when creating
1716 shared libraries and symbol visibility changes render the
1717 symbol local.
1718
1719 If on the other hand, we are creating an executable, we
1720 may need to keep relocations for symbols satisfied by a
1721 dynamic library if we manage to avoid copy relocs for the
1722 symbol. */
1723 if ((info->shared
1724 && (sec->flags & SEC_ALLOC) != 0
1725 && (r_type != R_386_PC32
1726 || (h != NULL
1727 && (! SYMBOLIC_BIND (info, h)
1728 || h->root.type == bfd_link_hash_defweak
1729 || !h->def_regular))))
1730 || (ELIMINATE_COPY_RELOCS
1731 && !info->shared
1732 && (sec->flags & SEC_ALLOC) != 0
1733 && h != NULL
1734 && (h->root.type == bfd_link_hash_defweak
1735 || !h->def_regular)))
1736 {
1737 struct elf_dyn_relocs *p;
1738 struct elf_dyn_relocs **head;
1739
1740 /* We must copy these reloc types into the output file.
1741 Create a reloc section in dynobj and make room for
1742 this reloc. */
1743 if (sreloc == NULL)
1744 {
1745 if (htab->elf.dynobj == NULL)
1746 htab->elf.dynobj = abfd;
1747
1748 sreloc = _bfd_elf_make_dynamic_reloc_section
1749 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1750
1751 if (sreloc == NULL)
1752 return FALSE;
1753 }
1754
1755 /* If this is a global symbol, we count the number of
1756 relocations we need for this symbol. */
1757 if (h != NULL)
1758 {
1759 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1760 }
1761 else
1762 {
1763 /* Track dynamic relocs needed for local syms too.
1764 We really need local syms available to do this
1765 easily. Oh well. */
1766 void **vpp;
1767 asection *s;
1768
1769 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1770 abfd, r_symndx);
1771 if (isym == NULL)
1772 return FALSE;
1773
1774 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1775 if (s == NULL)
1776 s = sec;
1777
1778 vpp = &elf_section_data (s)->local_dynrel;
1779 head = (struct elf_dyn_relocs **)vpp;
1780 }
1781
1782 p = *head;
1783 if (p == NULL || p->sec != sec)
1784 {
1785 bfd_size_type amt = sizeof *p;
1786 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1787 amt);
1788 if (p == NULL)
1789 return FALSE;
1790 p->next = *head;
1791 *head = p;
1792 p->sec = sec;
1793 p->count = 0;
1794 p->pc_count = 0;
1795 }
1796
1797 p->count += 1;
1798 /* Count size relocation as PC-relative relocation. */
1799 if (r_type == R_386_PC32 || size_reloc)
1800 p->pc_count += 1;
1801 }
1802 break;
1803
1804 /* This relocation describes the C++ object vtable hierarchy.
1805 Reconstruct it for later use during GC. */
1806 case R_386_GNU_VTINHERIT:
1807 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1808 return FALSE;
1809 break;
1810
1811 /* This relocation describes which C++ vtable entries are actually
1812 used. Record for later use during GC. */
1813 case R_386_GNU_VTENTRY:
1814 BFD_ASSERT (h != NULL);
1815 if (h != NULL
1816 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1817 return FALSE;
1818 break;
1819
1820 default:
1821 break;
1822 }
1823 }
1824
1825 return TRUE;
1826 }
1827
1828 /* Return the section that should be marked against GC for a given
1829 relocation. */
1830
1831 static asection *
1832 elf_i386_gc_mark_hook (asection *sec,
1833 struct bfd_link_info *info,
1834 Elf_Internal_Rela *rel,
1835 struct elf_link_hash_entry *h,
1836 Elf_Internal_Sym *sym)
1837 {
1838 if (h != NULL)
1839 switch (ELF32_R_TYPE (rel->r_info))
1840 {
1841 case R_386_GNU_VTINHERIT:
1842 case R_386_GNU_VTENTRY:
1843 return NULL;
1844 }
1845
1846 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1847 }
1848
1849 /* Update the got entry reference counts for the section being removed. */
1850
1851 static bfd_boolean
1852 elf_i386_gc_sweep_hook (bfd *abfd,
1853 struct bfd_link_info *info,
1854 asection *sec,
1855 const Elf_Internal_Rela *relocs)
1856 {
1857 struct elf_i386_link_hash_table *htab;
1858 Elf_Internal_Shdr *symtab_hdr;
1859 struct elf_link_hash_entry **sym_hashes;
1860 bfd_signed_vma *local_got_refcounts;
1861 const Elf_Internal_Rela *rel, *relend;
1862
1863 if (info->relocatable)
1864 return TRUE;
1865
1866 htab = elf_i386_hash_table (info);
1867 if (htab == NULL)
1868 return FALSE;
1869
1870 elf_section_data (sec)->local_dynrel = NULL;
1871
1872 symtab_hdr = &elf_symtab_hdr (abfd);
1873 sym_hashes = elf_sym_hashes (abfd);
1874 local_got_refcounts = elf_local_got_refcounts (abfd);
1875
1876 relend = relocs + sec->reloc_count;
1877 for (rel = relocs; rel < relend; rel++)
1878 {
1879 unsigned long r_symndx;
1880 unsigned int r_type;
1881 struct elf_link_hash_entry *h = NULL;
1882
1883 r_symndx = ELF32_R_SYM (rel->r_info);
1884 if (r_symndx >= symtab_hdr->sh_info)
1885 {
1886 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1887 while (h->root.type == bfd_link_hash_indirect
1888 || h->root.type == bfd_link_hash_warning)
1889 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1890 }
1891 else
1892 {
1893 /* A local symbol. */
1894 Elf_Internal_Sym *isym;
1895
1896 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1897 abfd, r_symndx);
1898
1899 /* Check relocation against local STT_GNU_IFUNC symbol. */
1900 if (isym != NULL
1901 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1902 {
1903 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1904 if (h == NULL)
1905 abort ();
1906 }
1907 }
1908
1909 if (h)
1910 {
1911 struct elf_i386_link_hash_entry *eh;
1912 struct elf_dyn_relocs **pp;
1913 struct elf_dyn_relocs *p;
1914
1915 eh = (struct elf_i386_link_hash_entry *) h;
1916 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1917 if (p->sec == sec)
1918 {
1919 /* Everything must go for SEC. */
1920 *pp = p->next;
1921 break;
1922 }
1923 }
1924
1925 r_type = ELF32_R_TYPE (rel->r_info);
1926 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1927 symtab_hdr, sym_hashes,
1928 &r_type, GOT_UNKNOWN,
1929 rel, relend, h, r_symndx))
1930 return FALSE;
1931
1932 switch (r_type)
1933 {
1934 case R_386_TLS_LDM:
1935 if (htab->tls_ldm_got.refcount > 0)
1936 htab->tls_ldm_got.refcount -= 1;
1937 break;
1938
1939 case R_386_TLS_GD:
1940 case R_386_TLS_GOTDESC:
1941 case R_386_TLS_DESC_CALL:
1942 case R_386_TLS_IE_32:
1943 case R_386_TLS_IE:
1944 case R_386_TLS_GOTIE:
1945 case R_386_GOT32:
1946 if (h != NULL)
1947 {
1948 if (h->got.refcount > 0)
1949 h->got.refcount -= 1;
1950 if (h->type == STT_GNU_IFUNC)
1951 {
1952 if (h->plt.refcount > 0)
1953 h->plt.refcount -= 1;
1954 }
1955 }
1956 else if (local_got_refcounts != NULL)
1957 {
1958 if (local_got_refcounts[r_symndx] > 0)
1959 local_got_refcounts[r_symndx] -= 1;
1960 }
1961 break;
1962
1963 case R_386_32:
1964 case R_386_PC32:
1965 case R_386_SIZE32:
1966 if (info->shared
1967 && (h == NULL || h->type != STT_GNU_IFUNC))
1968 break;
1969 /* Fall through */
1970
1971 case R_386_PLT32:
1972 if (h != NULL)
1973 {
1974 if (h->plt.refcount > 0)
1975 h->plt.refcount -= 1;
1976 }
1977 break;
1978
1979 case R_386_GOTOFF:
1980 if (h != NULL && h->type == STT_GNU_IFUNC)
1981 {
1982 if (h->got.refcount > 0)
1983 h->got.refcount -= 1;
1984 if (h->plt.refcount > 0)
1985 h->plt.refcount -= 1;
1986 }
1987 break;
1988
1989 default:
1990 break;
1991 }
1992 }
1993
1994 return TRUE;
1995 }
1996
1997 /* Adjust a symbol defined by a dynamic object and referenced by a
1998 regular object. The current definition is in some section of the
1999 dynamic object, but we're not including those sections. We have to
2000 change the definition to something the rest of the link can
2001 understand. */
2002
2003 static bfd_boolean
2004 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2005 struct elf_link_hash_entry *h)
2006 {
2007 struct elf_i386_link_hash_table *htab;
2008 asection *s;
2009 struct elf_i386_link_hash_entry *eh;
2010 struct elf_dyn_relocs *p;
2011
2012 /* STT_GNU_IFUNC symbol must go through PLT. */
2013 if (h->type == STT_GNU_IFUNC)
2014 {
2015 /* All local STT_GNU_IFUNC references must be treate as local
2016 calls via local PLT. */
2017 if (h->ref_regular
2018 && SYMBOL_CALLS_LOCAL (info, h))
2019 {
2020 bfd_size_type pc_count = 0, count = 0;
2021 struct elf_dyn_relocs **pp;
2022
2023 eh = (struct elf_i386_link_hash_entry *) h;
2024 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2025 {
2026 pc_count += p->pc_count;
2027 p->count -= p->pc_count;
2028 p->pc_count = 0;
2029 count += p->count;
2030 if (p->count == 0)
2031 *pp = p->next;
2032 else
2033 pp = &p->next;
2034 }
2035
2036 if (pc_count || count)
2037 {
2038 h->needs_plt = 1;
2039 h->non_got_ref = 1;
2040 if (h->plt.refcount <= 0)
2041 h->plt.refcount = 1;
2042 else
2043 h->plt.refcount += 1;
2044 }
2045 }
2046
2047 if (h->plt.refcount <= 0)
2048 {
2049 h->plt.offset = (bfd_vma) -1;
2050 h->needs_plt = 0;
2051 }
2052 return TRUE;
2053 }
2054
2055 /* If this is a function, put it in the procedure linkage table. We
2056 will fill in the contents of the procedure linkage table later,
2057 when we know the address of the .got section. */
2058 if (h->type == STT_FUNC
2059 || h->needs_plt)
2060 {
2061 if (h->plt.refcount <= 0
2062 || SYMBOL_CALLS_LOCAL (info, h)
2063 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2064 && h->root.type == bfd_link_hash_undefweak))
2065 {
2066 /* This case can occur if we saw a PLT32 reloc in an input
2067 file, but the symbol was never referred to by a dynamic
2068 object, or if all references were garbage collected. In
2069 such a case, we don't actually need to build a procedure
2070 linkage table, and we can just do a PC32 reloc instead. */
2071 h->plt.offset = (bfd_vma) -1;
2072 h->needs_plt = 0;
2073 }
2074
2075 return TRUE;
2076 }
2077 else
2078 /* It's possible that we incorrectly decided a .plt reloc was
2079 needed for an R_386_PC32 reloc to a non-function sym in
2080 check_relocs. We can't decide accurately between function and
2081 non-function syms in check-relocs; Objects loaded later in
2082 the link may change h->type. So fix it now. */
2083 h->plt.offset = (bfd_vma) -1;
2084
2085 /* If this is a weak symbol, and there is a real definition, the
2086 processor independent code will have arranged for us to see the
2087 real definition first, and we can just use the same value. */
2088 if (h->u.weakdef != NULL)
2089 {
2090 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2091 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2092 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2093 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2094 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2095 h->non_got_ref = h->u.weakdef->non_got_ref;
2096 return TRUE;
2097 }
2098
2099 /* This is a reference to a symbol defined by a dynamic object which
2100 is not a function. */
2101
2102 /* If we are creating a shared library, we must presume that the
2103 only references to the symbol are via the global offset table.
2104 For such cases we need not do anything here; the relocations will
2105 be handled correctly by relocate_section. */
2106 if (info->shared)
2107 return TRUE;
2108
2109 /* If there are no references to this symbol that do not use the
2110 GOT, we don't need to generate a copy reloc. */
2111 if (!h->non_got_ref)
2112 return TRUE;
2113
2114 /* If -z nocopyreloc was given, we won't generate them either. */
2115 if (info->nocopyreloc)
2116 {
2117 h->non_got_ref = 0;
2118 return TRUE;
2119 }
2120
2121 htab = elf_i386_hash_table (info);
2122 if (htab == NULL)
2123 return FALSE;
2124
2125 /* If there aren't any dynamic relocs in read-only sections, then
2126 we can keep the dynamic relocs and avoid the copy reloc. This
2127 doesn't work on VxWorks, where we can not have dynamic relocations
2128 (other than copy and jump slot relocations) in an executable. */
2129 if (ELIMINATE_COPY_RELOCS
2130 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2131 {
2132 eh = (struct elf_i386_link_hash_entry *) h;
2133 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2134 {
2135 s = p->sec->output_section;
2136 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2137 break;
2138 }
2139
2140 if (p == NULL)
2141 {
2142 h->non_got_ref = 0;
2143 return TRUE;
2144 }
2145 }
2146
2147 /* We must allocate the symbol in our .dynbss section, which will
2148 become part of the .bss section of the executable. There will be
2149 an entry for this symbol in the .dynsym section. The dynamic
2150 object will contain position independent code, so all references
2151 from the dynamic object to this symbol will go through the global
2152 offset table. The dynamic linker will use the .dynsym entry to
2153 determine the address it must put in the global offset table, so
2154 both the dynamic object and the regular object will refer to the
2155 same memory location for the variable. */
2156
2157 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2158 copy the initial value out of the dynamic object and into the
2159 runtime process image. */
2160 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2161 {
2162 htab->srelbss->size += sizeof (Elf32_External_Rel);
2163 h->needs_copy = 1;
2164 }
2165
2166 s = htab->sdynbss;
2167
2168 return _bfd_elf_adjust_dynamic_copy (h, s);
2169 }
2170
2171 /* Allocate space in .plt, .got and associated reloc sections for
2172 dynamic relocs. */
2173
2174 static bfd_boolean
2175 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2176 {
2177 struct bfd_link_info *info;
2178 struct elf_i386_link_hash_table *htab;
2179 struct elf_i386_link_hash_entry *eh;
2180 struct elf_dyn_relocs *p;
2181 unsigned plt_entry_size;
2182
2183 if (h->root.type == bfd_link_hash_indirect)
2184 return TRUE;
2185
2186 eh = (struct elf_i386_link_hash_entry *) h;
2187
2188 info = (struct bfd_link_info *) inf;
2189 htab = elf_i386_hash_table (info);
2190 if (htab == NULL)
2191 return FALSE;
2192
2193 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2194
2195 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2196 here if it is defined and referenced in a non-shared object. */
2197 if (h->type == STT_GNU_IFUNC
2198 && h->def_regular)
2199 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2200 plt_entry_size,
2201 plt_entry_size, 4);
2202 else if (htab->elf.dynamic_sections_created
2203 && h->plt.refcount > 0)
2204 {
2205 /* Make sure this symbol is output as a dynamic symbol.
2206 Undefined weak syms won't yet be marked as dynamic. */
2207 if (h->dynindx == -1
2208 && !h->forced_local)
2209 {
2210 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2211 return FALSE;
2212 }
2213
2214 if (info->shared
2215 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2216 {
2217 asection *s = htab->elf.splt;
2218
2219 /* If this is the first .plt entry, make room for the special
2220 first entry. */
2221 if (s->size == 0)
2222 s->size += plt_entry_size;
2223
2224 h->plt.offset = s->size;
2225
2226 /* If this symbol is not defined in a regular file, and we are
2227 not generating a shared library, then set the symbol to this
2228 location in the .plt. This is required to make function
2229 pointers compare as equal between the normal executable and
2230 the shared library. */
2231 if (! info->shared
2232 && !h->def_regular)
2233 {
2234 h->root.u.def.section = s;
2235 h->root.u.def.value = h->plt.offset;
2236 }
2237
2238 /* Make room for this entry. */
2239 s->size += plt_entry_size;
2240
2241 /* We also need to make an entry in the .got.plt section, which
2242 will be placed in the .got section by the linker script. */
2243 htab->elf.sgotplt->size += 4;
2244
2245 /* We also need to make an entry in the .rel.plt section. */
2246 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2247 htab->elf.srelplt->reloc_count++;
2248
2249 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2250 && !info->shared)
2251 {
2252 /* VxWorks has a second set of relocations for each PLT entry
2253 in executables. They go in a separate relocation section,
2254 which is processed by the kernel loader. */
2255
2256 /* There are two relocations for the initial PLT entry: an
2257 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2258 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2259
2260 if (h->plt.offset == plt_entry_size)
2261 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2262
2263 /* There are two extra relocations for each subsequent PLT entry:
2264 an R_386_32 relocation for the GOT entry, and an R_386_32
2265 relocation for the PLT entry. */
2266
2267 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2268 }
2269 }
2270 else
2271 {
2272 h->plt.offset = (bfd_vma) -1;
2273 h->needs_plt = 0;
2274 }
2275 }
2276 else
2277 {
2278 h->plt.offset = (bfd_vma) -1;
2279 h->needs_plt = 0;
2280 }
2281
2282 eh->tlsdesc_got = (bfd_vma) -1;
2283
2284 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2285 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2286 if (h->got.refcount > 0
2287 && info->executable
2288 && h->dynindx == -1
2289 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2290 h->got.offset = (bfd_vma) -1;
2291 else if (h->got.refcount > 0)
2292 {
2293 asection *s;
2294 bfd_boolean dyn;
2295 int tls_type = elf_i386_hash_entry(h)->tls_type;
2296
2297 /* Make sure this symbol is output as a dynamic symbol.
2298 Undefined weak syms won't yet be marked as dynamic. */
2299 if (h->dynindx == -1
2300 && !h->forced_local)
2301 {
2302 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2303 return FALSE;
2304 }
2305
2306 s = htab->elf.sgot;
2307 if (GOT_TLS_GDESC_P (tls_type))
2308 {
2309 eh->tlsdesc_got = htab->elf.sgotplt->size
2310 - elf_i386_compute_jump_table_size (htab);
2311 htab->elf.sgotplt->size += 8;
2312 h->got.offset = (bfd_vma) -2;
2313 }
2314 if (! GOT_TLS_GDESC_P (tls_type)
2315 || GOT_TLS_GD_P (tls_type))
2316 {
2317 h->got.offset = s->size;
2318 s->size += 4;
2319 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2320 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2321 s->size += 4;
2322 }
2323 dyn = htab->elf.dynamic_sections_created;
2324 /* R_386_TLS_IE_32 needs one dynamic relocation,
2325 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2326 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2327 need two), R_386_TLS_GD needs one if local symbol and two if
2328 global. */
2329 if (tls_type == GOT_TLS_IE_BOTH)
2330 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2331 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2332 || (tls_type & GOT_TLS_IE))
2333 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2334 else if (GOT_TLS_GD_P (tls_type))
2335 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2336 else if (! GOT_TLS_GDESC_P (tls_type)
2337 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2338 || h->root.type != bfd_link_hash_undefweak)
2339 && (info->shared
2340 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2341 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2342 if (GOT_TLS_GDESC_P (tls_type))
2343 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2344 }
2345 else
2346 h->got.offset = (bfd_vma) -1;
2347
2348 if (eh->dyn_relocs == NULL)
2349 return TRUE;
2350
2351 /* In the shared -Bsymbolic case, discard space allocated for
2352 dynamic pc-relative relocs against symbols which turn out to be
2353 defined in regular objects. For the normal shared case, discard
2354 space for pc-relative relocs that have become local due to symbol
2355 visibility changes. */
2356
2357 if (info->shared)
2358 {
2359 /* The only reloc that uses pc_count is R_386_PC32, which will
2360 appear on a call or on something like ".long foo - .". We
2361 want calls to protected symbols to resolve directly to the
2362 function rather than going via the plt. If people want
2363 function pointer comparisons to work as expected then they
2364 should avoid writing assembly like ".long foo - .". */
2365 if (SYMBOL_CALLS_LOCAL (info, h))
2366 {
2367 struct elf_dyn_relocs **pp;
2368
2369 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2370 {
2371 p->count -= p->pc_count;
2372 p->pc_count = 0;
2373 if (p->count == 0)
2374 *pp = p->next;
2375 else
2376 pp = &p->next;
2377 }
2378 }
2379
2380 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2381 {
2382 struct elf_dyn_relocs **pp;
2383 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2384 {
2385 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2386 *pp = p->next;
2387 else
2388 pp = &p->next;
2389 }
2390 }
2391
2392 /* Also discard relocs on undefined weak syms with non-default
2393 visibility. */
2394 if (eh->dyn_relocs != NULL
2395 && h->root.type == bfd_link_hash_undefweak)
2396 {
2397 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2398 eh->dyn_relocs = NULL;
2399
2400 /* Make sure undefined weak symbols are output as a dynamic
2401 symbol in PIEs. */
2402 else if (h->dynindx == -1
2403 && !h->forced_local)
2404 {
2405 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2406 return FALSE;
2407 }
2408 }
2409 }
2410 else if (ELIMINATE_COPY_RELOCS)
2411 {
2412 /* For the non-shared case, discard space for relocs against
2413 symbols which turn out to need copy relocs or are not
2414 dynamic. */
2415
2416 if (!h->non_got_ref
2417 && ((h->def_dynamic
2418 && !h->def_regular)
2419 || (htab->elf.dynamic_sections_created
2420 && (h->root.type == bfd_link_hash_undefweak
2421 || h->root.type == bfd_link_hash_undefined))))
2422 {
2423 /* Make sure this symbol is output as a dynamic symbol.
2424 Undefined weak syms won't yet be marked as dynamic. */
2425 if (h->dynindx == -1
2426 && !h->forced_local)
2427 {
2428 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2429 return FALSE;
2430 }
2431
2432 /* If that succeeded, we know we'll be keeping all the
2433 relocs. */
2434 if (h->dynindx != -1)
2435 goto keep;
2436 }
2437
2438 eh->dyn_relocs = NULL;
2439
2440 keep: ;
2441 }
2442
2443 /* Finally, allocate space. */
2444 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2445 {
2446 asection *sreloc;
2447
2448 sreloc = elf_section_data (p->sec)->sreloc;
2449
2450 BFD_ASSERT (sreloc != NULL);
2451 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2452 }
2453
2454 return TRUE;
2455 }
2456
2457 /* Allocate space in .plt, .got and associated reloc sections for
2458 local dynamic relocs. */
2459
2460 static bfd_boolean
2461 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2462 {
2463 struct elf_link_hash_entry *h
2464 = (struct elf_link_hash_entry *) *slot;
2465
2466 if (h->type != STT_GNU_IFUNC
2467 || !h->def_regular
2468 || !h->ref_regular
2469 || !h->forced_local
2470 || h->root.type != bfd_link_hash_defined)
2471 abort ();
2472
2473 return elf_i386_allocate_dynrelocs (h, inf);
2474 }
2475
2476 /* Find any dynamic relocs that apply to read-only sections. */
2477
2478 static bfd_boolean
2479 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2480 {
2481 struct elf_i386_link_hash_entry *eh;
2482 struct elf_dyn_relocs *p;
2483
2484 /* Skip local IFUNC symbols. */
2485 if (h->forced_local && h->type == STT_GNU_IFUNC)
2486 return TRUE;
2487
2488 eh = (struct elf_i386_link_hash_entry *) h;
2489 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2490 {
2491 asection *s = p->sec->output_section;
2492
2493 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2494 {
2495 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2496
2497 info->flags |= DF_TEXTREL;
2498
2499 if (info->warn_shared_textrel && info->shared)
2500 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2501 p->sec->owner, h->root.root.string,
2502 p->sec);
2503
2504 /* Not an error, just cut short the traversal. */
2505 return FALSE;
2506 }
2507 }
2508 return TRUE;
2509 }
2510
2511 /* Convert
2512 mov foo@GOT(%reg), %reg
2513 to
2514 lea foo@GOTOFF(%reg), %reg
2515 with the local symbol, foo. */
2516
2517 static bfd_boolean
2518 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2519 struct bfd_link_info *link_info)
2520 {
2521 Elf_Internal_Shdr *symtab_hdr;
2522 Elf_Internal_Rela *internal_relocs;
2523 Elf_Internal_Rela *irel, *irelend;
2524 bfd_byte *contents;
2525 struct elf_i386_link_hash_table *htab;
2526 bfd_boolean changed_contents;
2527 bfd_boolean changed_relocs;
2528 bfd_signed_vma *local_got_refcounts;
2529
2530 /* Don't even try to convert non-ELF outputs. */
2531 if (!is_elf_hash_table (link_info->hash))
2532 return FALSE;
2533
2534 /* Nothing to do if there are no codes, no relocations or no output. */
2535 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2536 || sec->reloc_count == 0
2537 || discarded_section (sec))
2538 return TRUE;
2539
2540 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2541
2542 /* Load the relocations for this section. */
2543 internal_relocs = (_bfd_elf_link_read_relocs
2544 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2545 link_info->keep_memory));
2546 if (internal_relocs == NULL)
2547 return FALSE;
2548
2549 htab = elf_i386_hash_table (link_info);
2550 changed_contents = FALSE;
2551 changed_relocs = FALSE;
2552 local_got_refcounts = elf_local_got_refcounts (abfd);
2553
2554 /* Get the section contents. */
2555 if (elf_section_data (sec)->this_hdr.contents != NULL)
2556 contents = elf_section_data (sec)->this_hdr.contents;
2557 else
2558 {
2559 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2560 goto error_return;
2561 }
2562
2563 irelend = internal_relocs + sec->reloc_count;
2564 for (irel = internal_relocs; irel < irelend; irel++)
2565 {
2566 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2567 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2568 unsigned int indx;
2569 struct elf_link_hash_entry *h;
2570
2571 if (r_type != R_386_GOT32)
2572 continue;
2573
2574 /* Get the symbol referred to by the reloc. */
2575 if (r_symndx < symtab_hdr->sh_info)
2576 {
2577 Elf_Internal_Sym *isym;
2578
2579 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2580 abfd, r_symndx);
2581
2582 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2583 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2584 && bfd_get_8 (input_bfd,
2585 contents + irel->r_offset - 2) == 0x8b)
2586 {
2587 bfd_put_8 (output_bfd, 0x8d,
2588 contents + irel->r_offset - 2);
2589 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2590 if (local_got_refcounts != NULL
2591 && local_got_refcounts[r_symndx] > 0)
2592 local_got_refcounts[r_symndx] -= 1;
2593 changed_contents = TRUE;
2594 changed_relocs = TRUE;
2595 }
2596 continue;
2597 }
2598
2599 indx = r_symndx - symtab_hdr->sh_info;
2600 h = elf_sym_hashes (abfd)[indx];
2601 BFD_ASSERT (h != NULL);
2602
2603 while (h->root.type == bfd_link_hash_indirect
2604 || h->root.type == bfd_link_hash_warning)
2605 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2606
2607 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2608 optimizing _DYNAMIC since ld.so may use its link-time address. */
2609 if (h->def_regular
2610 && h->type != STT_GNU_IFUNC
2611 && h != htab->elf.hdynamic
2612 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2613 && bfd_get_8 (input_bfd,
2614 contents + irel->r_offset - 2) == 0x8b)
2615 {
2616 bfd_put_8 (output_bfd, 0x8d,
2617 contents + irel->r_offset - 2);
2618 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2619 if (h->got.refcount > 0)
2620 h->got.refcount -= 1;
2621 changed_contents = TRUE;
2622 changed_relocs = TRUE;
2623 }
2624 }
2625
2626 if (contents != NULL
2627 && elf_section_data (sec)->this_hdr.contents != contents)
2628 {
2629 if (!changed_contents && !link_info->keep_memory)
2630 free (contents);
2631 else
2632 {
2633 /* Cache the section contents for elf_link_input_bfd. */
2634 elf_section_data (sec)->this_hdr.contents = contents;
2635 }
2636 }
2637
2638 if (elf_section_data (sec)->relocs != internal_relocs)
2639 {
2640 if (!changed_relocs)
2641 free (internal_relocs);
2642 else
2643 elf_section_data (sec)->relocs = internal_relocs;
2644 }
2645
2646 return TRUE;
2647
2648 error_return:
2649 if (contents != NULL
2650 && elf_section_data (sec)->this_hdr.contents != contents)
2651 free (contents);
2652 if (internal_relocs != NULL
2653 && elf_section_data (sec)->relocs != internal_relocs)
2654 free (internal_relocs);
2655 return FALSE;
2656 }
2657
2658 /* Set the sizes of the dynamic sections. */
2659
2660 static bfd_boolean
2661 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2662 {
2663 struct elf_i386_link_hash_table *htab;
2664 bfd *dynobj;
2665 asection *s;
2666 bfd_boolean relocs;
2667 bfd *ibfd;
2668
2669 htab = elf_i386_hash_table (info);
2670 if (htab == NULL)
2671 return FALSE;
2672 dynobj = htab->elf.dynobj;
2673 if (dynobj == NULL)
2674 abort ();
2675
2676 if (htab->elf.dynamic_sections_created)
2677 {
2678 /* Set the contents of the .interp section to the interpreter. */
2679 if (info->executable)
2680 {
2681 s = bfd_get_linker_section (dynobj, ".interp");
2682 if (s == NULL)
2683 abort ();
2684 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2685 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2686 }
2687 }
2688
2689 /* Set up .got offsets for local syms, and space for local dynamic
2690 relocs. */
2691 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2692 {
2693 bfd_signed_vma *local_got;
2694 bfd_signed_vma *end_local_got;
2695 char *local_tls_type;
2696 bfd_vma *local_tlsdesc_gotent;
2697 bfd_size_type locsymcount;
2698 Elf_Internal_Shdr *symtab_hdr;
2699 asection *srel;
2700
2701 if (! is_i386_elf (ibfd))
2702 continue;
2703
2704 for (s = ibfd->sections; s != NULL; s = s->next)
2705 {
2706 struct elf_dyn_relocs *p;
2707
2708 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2709 return FALSE;
2710
2711 for (p = ((struct elf_dyn_relocs *)
2712 elf_section_data (s)->local_dynrel);
2713 p != NULL;
2714 p = p->next)
2715 {
2716 if (!bfd_is_abs_section (p->sec)
2717 && bfd_is_abs_section (p->sec->output_section))
2718 {
2719 /* Input section has been discarded, either because
2720 it is a copy of a linkonce section or due to
2721 linker script /DISCARD/, so we'll be discarding
2722 the relocs too. */
2723 }
2724 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2725 && strcmp (p->sec->output_section->name,
2726 ".tls_vars") == 0)
2727 {
2728 /* Relocations in vxworks .tls_vars sections are
2729 handled specially by the loader. */
2730 }
2731 else if (p->count != 0)
2732 {
2733 srel = elf_section_data (p->sec)->sreloc;
2734 srel->size += p->count * sizeof (Elf32_External_Rel);
2735 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2736 && (info->flags & DF_TEXTREL) == 0)
2737 {
2738 info->flags |= DF_TEXTREL;
2739 if (info->warn_shared_textrel && info->shared)
2740 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2741 p->sec->owner, p->sec);
2742 }
2743 }
2744 }
2745 }
2746
2747 local_got = elf_local_got_refcounts (ibfd);
2748 if (!local_got)
2749 continue;
2750
2751 symtab_hdr = &elf_symtab_hdr (ibfd);
2752 locsymcount = symtab_hdr->sh_info;
2753 end_local_got = local_got + locsymcount;
2754 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2755 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2756 s = htab->elf.sgot;
2757 srel = htab->elf.srelgot;
2758 for (; local_got < end_local_got;
2759 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2760 {
2761 *local_tlsdesc_gotent = (bfd_vma) -1;
2762 if (*local_got > 0)
2763 {
2764 if (GOT_TLS_GDESC_P (*local_tls_type))
2765 {
2766 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2767 - elf_i386_compute_jump_table_size (htab);
2768 htab->elf.sgotplt->size += 8;
2769 *local_got = (bfd_vma) -2;
2770 }
2771 if (! GOT_TLS_GDESC_P (*local_tls_type)
2772 || GOT_TLS_GD_P (*local_tls_type))
2773 {
2774 *local_got = s->size;
2775 s->size += 4;
2776 if (GOT_TLS_GD_P (*local_tls_type)
2777 || *local_tls_type == GOT_TLS_IE_BOTH)
2778 s->size += 4;
2779 }
2780 if (info->shared
2781 || GOT_TLS_GD_ANY_P (*local_tls_type)
2782 || (*local_tls_type & GOT_TLS_IE))
2783 {
2784 if (*local_tls_type == GOT_TLS_IE_BOTH)
2785 srel->size += 2 * sizeof (Elf32_External_Rel);
2786 else if (GOT_TLS_GD_P (*local_tls_type)
2787 || ! GOT_TLS_GDESC_P (*local_tls_type))
2788 srel->size += sizeof (Elf32_External_Rel);
2789 if (GOT_TLS_GDESC_P (*local_tls_type))
2790 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2791 }
2792 }
2793 else
2794 *local_got = (bfd_vma) -1;
2795 }
2796 }
2797
2798 if (htab->tls_ldm_got.refcount > 0)
2799 {
2800 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2801 relocs. */
2802 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2803 htab->elf.sgot->size += 8;
2804 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2805 }
2806 else
2807 htab->tls_ldm_got.offset = -1;
2808
2809 /* Allocate global sym .plt and .got entries, and space for global
2810 sym dynamic relocs. */
2811 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2812
2813 /* Allocate .plt and .got entries, and space for local symbols. */
2814 htab_traverse (htab->loc_hash_table,
2815 elf_i386_allocate_local_dynrelocs,
2816 info);
2817
2818 /* For every jump slot reserved in the sgotplt, reloc_count is
2819 incremented. However, when we reserve space for TLS descriptors,
2820 it's not incremented, so in order to compute the space reserved
2821 for them, it suffices to multiply the reloc count by the jump
2822 slot size.
2823
2824 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2825 so that R_386_IRELATIVE entries come last. */
2826 if (htab->elf.srelplt)
2827 {
2828 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2829 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2830 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2831 }
2832 else if (htab->elf.irelplt)
2833 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2834
2835
2836 if (htab->elf.sgotplt)
2837 {
2838 /* Don't allocate .got.plt section if there are no GOT nor PLT
2839 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2840 if ((htab->elf.hgot == NULL
2841 || !htab->elf.hgot->ref_regular_nonweak)
2842 && (htab->elf.sgotplt->size
2843 == get_elf_backend_data (output_bfd)->got_header_size)
2844 && (htab->elf.splt == NULL
2845 || htab->elf.splt->size == 0)
2846 && (htab->elf.sgot == NULL
2847 || htab->elf.sgot->size == 0)
2848 && (htab->elf.iplt == NULL
2849 || htab->elf.iplt->size == 0)
2850 && (htab->elf.igotplt == NULL
2851 || htab->elf.igotplt->size == 0))
2852 htab->elf.sgotplt->size = 0;
2853 }
2854
2855
2856 if (htab->plt_eh_frame != NULL
2857 && htab->elf.splt != NULL
2858 && htab->elf.splt->size != 0
2859 && !bfd_is_abs_section (htab->elf.splt->output_section)
2860 && _bfd_elf_eh_frame_present (info))
2861 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2862
2863 /* We now have determined the sizes of the various dynamic sections.
2864 Allocate memory for them. */
2865 relocs = FALSE;
2866 for (s = dynobj->sections; s != NULL; s = s->next)
2867 {
2868 bfd_boolean strip_section = TRUE;
2869
2870 if ((s->flags & SEC_LINKER_CREATED) == 0)
2871 continue;
2872
2873 if (s == htab->elf.splt
2874 || s == htab->elf.sgot)
2875 {
2876 /* Strip this section if we don't need it; see the
2877 comment below. */
2878 /* We'd like to strip these sections if they aren't needed, but if
2879 we've exported dynamic symbols from them we must leave them.
2880 It's too late to tell BFD to get rid of the symbols. */
2881
2882 if (htab->elf.hplt != NULL)
2883 strip_section = FALSE;
2884 }
2885 else if (s == htab->elf.sgotplt
2886 || s == htab->elf.iplt
2887 || s == htab->elf.igotplt
2888 || s == htab->plt_eh_frame
2889 || s == htab->sdynbss)
2890 {
2891 /* Strip these too. */
2892 }
2893 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2894 {
2895 if (s->size != 0
2896 && s != htab->elf.srelplt
2897 && s != htab->srelplt2)
2898 relocs = TRUE;
2899
2900 /* We use the reloc_count field as a counter if we need
2901 to copy relocs into the output file. */
2902 s->reloc_count = 0;
2903 }
2904 else
2905 {
2906 /* It's not one of our sections, so don't allocate space. */
2907 continue;
2908 }
2909
2910 if (s->size == 0)
2911 {
2912 /* If we don't need this section, strip it from the
2913 output file. This is mostly to handle .rel.bss and
2914 .rel.plt. We must create both sections in
2915 create_dynamic_sections, because they must be created
2916 before the linker maps input sections to output
2917 sections. The linker does that before
2918 adjust_dynamic_symbol is called, and it is that
2919 function which decides whether anything needs to go
2920 into these sections. */
2921 if (strip_section)
2922 s->flags |= SEC_EXCLUDE;
2923 continue;
2924 }
2925
2926 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2927 continue;
2928
2929 /* Allocate memory for the section contents. We use bfd_zalloc
2930 here in case unused entries are not reclaimed before the
2931 section's contents are written out. This should not happen,
2932 but this way if it does, we get a R_386_NONE reloc instead
2933 of garbage. */
2934 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2935 if (s->contents == NULL)
2936 return FALSE;
2937 }
2938
2939 if (htab->plt_eh_frame != NULL
2940 && htab->plt_eh_frame->contents != NULL)
2941 {
2942 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2943 sizeof (elf_i386_eh_frame_plt));
2944 bfd_put_32 (dynobj, htab->elf.splt->size,
2945 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2946 }
2947
2948 if (htab->elf.dynamic_sections_created)
2949 {
2950 /* Add some entries to the .dynamic section. We fill in the
2951 values later, in elf_i386_finish_dynamic_sections, but we
2952 must add the entries now so that we get the correct size for
2953 the .dynamic section. The DT_DEBUG entry is filled in by the
2954 dynamic linker and used by the debugger. */
2955 #define add_dynamic_entry(TAG, VAL) \
2956 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2957
2958 if (info->executable)
2959 {
2960 if (!add_dynamic_entry (DT_DEBUG, 0))
2961 return FALSE;
2962 }
2963
2964 if (htab->elf.splt->size != 0)
2965 {
2966 if (!add_dynamic_entry (DT_PLTGOT, 0)
2967 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2968 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2969 || !add_dynamic_entry (DT_JMPREL, 0))
2970 return FALSE;
2971 }
2972
2973 if (relocs)
2974 {
2975 if (!add_dynamic_entry (DT_REL, 0)
2976 || !add_dynamic_entry (DT_RELSZ, 0)
2977 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2978 return FALSE;
2979
2980 /* If any dynamic relocs apply to a read-only section,
2981 then we need a DT_TEXTREL entry. */
2982 if ((info->flags & DF_TEXTREL) == 0)
2983 elf_link_hash_traverse (&htab->elf,
2984 elf_i386_readonly_dynrelocs, info);
2985
2986 if ((info->flags & DF_TEXTREL) != 0)
2987 {
2988 if (!add_dynamic_entry (DT_TEXTREL, 0))
2989 return FALSE;
2990 }
2991 }
2992 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2993 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2994 return FALSE;
2995 }
2996 #undef add_dynamic_entry
2997
2998 return TRUE;
2999 }
3000
3001 static bfd_boolean
3002 elf_i386_always_size_sections (bfd *output_bfd,
3003 struct bfd_link_info *info)
3004 {
3005 asection *tls_sec = elf_hash_table (info)->tls_sec;
3006
3007 if (tls_sec)
3008 {
3009 struct elf_link_hash_entry *tlsbase;
3010
3011 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3012 "_TLS_MODULE_BASE_",
3013 FALSE, FALSE, FALSE);
3014
3015 if (tlsbase && tlsbase->type == STT_TLS)
3016 {
3017 struct elf_i386_link_hash_table *htab;
3018 struct bfd_link_hash_entry *bh = NULL;
3019 const struct elf_backend_data *bed
3020 = get_elf_backend_data (output_bfd);
3021
3022 htab = elf_i386_hash_table (info);
3023 if (htab == NULL)
3024 return FALSE;
3025
3026 if (!(_bfd_generic_link_add_one_symbol
3027 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3028 tls_sec, 0, NULL, FALSE,
3029 bed->collect, &bh)))
3030 return FALSE;
3031
3032 htab->tls_module_base = bh;
3033
3034 tlsbase = (struct elf_link_hash_entry *)bh;
3035 tlsbase->def_regular = 1;
3036 tlsbase->other = STV_HIDDEN;
3037 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3038 }
3039 }
3040
3041 return TRUE;
3042 }
3043
3044 /* Set the correct type for an x86 ELF section. We do this by the
3045 section name, which is a hack, but ought to work. */
3046
3047 static bfd_boolean
3048 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3049 Elf_Internal_Shdr *hdr,
3050 asection *sec)
3051 {
3052 const char *name;
3053
3054 name = bfd_get_section_name (abfd, sec);
3055
3056 /* This is an ugly, but unfortunately necessary hack that is
3057 needed when producing EFI binaries on x86. It tells
3058 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3059 containing ELF relocation info. We need this hack in order to
3060 be able to generate ELF binaries that can be translated into
3061 EFI applications (which are essentially COFF objects). Those
3062 files contain a COFF ".reloc" section inside an ELFNN object,
3063 which would normally cause BFD to segfault because it would
3064 attempt to interpret this section as containing relocation
3065 entries for section "oc". With this hack enabled, ".reloc"
3066 will be treated as a normal data section, which will avoid the
3067 segfault. However, you won't be able to create an ELFNN binary
3068 with a section named "oc" that needs relocations, but that's
3069 the kind of ugly side-effects you get when detecting section
3070 types based on their names... In practice, this limitation is
3071 unlikely to bite. */
3072 if (strcmp (name, ".reloc") == 0)
3073 hdr->sh_type = SHT_PROGBITS;
3074
3075 return TRUE;
3076 }
3077
3078 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3079 executables. Rather than setting it to the beginning of the TLS
3080 section, we have to set it to the end. This function may be called
3081 multiple times, it is idempotent. */
3082
3083 static void
3084 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3085 {
3086 struct elf_i386_link_hash_table *htab;
3087 struct bfd_link_hash_entry *base;
3088
3089 if (!info->executable)
3090 return;
3091
3092 htab = elf_i386_hash_table (info);
3093 if (htab == NULL)
3094 return;
3095
3096 base = htab->tls_module_base;
3097 if (base == NULL)
3098 return;
3099
3100 base->u.def.value = htab->elf.tls_size;
3101 }
3102
3103 /* Return the base VMA address which should be subtracted from real addresses
3104 when resolving @dtpoff relocation.
3105 This is PT_TLS segment p_vaddr. */
3106
3107 static bfd_vma
3108 elf_i386_dtpoff_base (struct bfd_link_info *info)
3109 {
3110 /* If tls_sec is NULL, we should have signalled an error already. */
3111 if (elf_hash_table (info)->tls_sec == NULL)
3112 return 0;
3113 return elf_hash_table (info)->tls_sec->vma;
3114 }
3115
3116 /* Return the relocation value for @tpoff relocation
3117 if STT_TLS virtual address is ADDRESS. */
3118
3119 static bfd_vma
3120 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3121 {
3122 struct elf_link_hash_table *htab = elf_hash_table (info);
3123 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3124 bfd_vma static_tls_size;
3125
3126 /* If tls_sec is NULL, we should have signalled an error already. */
3127 if (htab->tls_sec == NULL)
3128 return 0;
3129
3130 /* Consider special static TLS alignment requirements. */
3131 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3132 return static_tls_size + htab->tls_sec->vma - address;
3133 }
3134
3135 /* Relocate an i386 ELF section. */
3136
3137 static bfd_boolean
3138 elf_i386_relocate_section (bfd *output_bfd,
3139 struct bfd_link_info *info,
3140 bfd *input_bfd,
3141 asection *input_section,
3142 bfd_byte *contents,
3143 Elf_Internal_Rela *relocs,
3144 Elf_Internal_Sym *local_syms,
3145 asection **local_sections)
3146 {
3147 struct elf_i386_link_hash_table *htab;
3148 Elf_Internal_Shdr *symtab_hdr;
3149 struct elf_link_hash_entry **sym_hashes;
3150 bfd_vma *local_got_offsets;
3151 bfd_vma *local_tlsdesc_gotents;
3152 Elf_Internal_Rela *rel;
3153 Elf_Internal_Rela *relend;
3154 bfd_boolean is_vxworks_tls;
3155 unsigned plt_entry_size;
3156
3157 BFD_ASSERT (is_i386_elf (input_bfd));
3158
3159 htab = elf_i386_hash_table (info);
3160 if (htab == NULL)
3161 return FALSE;
3162 symtab_hdr = &elf_symtab_hdr (input_bfd);
3163 sym_hashes = elf_sym_hashes (input_bfd);
3164 local_got_offsets = elf_local_got_offsets (input_bfd);
3165 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3166 /* We have to handle relocations in vxworks .tls_vars sections
3167 specially, because the dynamic loader is 'weird'. */
3168 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3169 && info->shared
3170 && !strcmp (input_section->output_section->name,
3171 ".tls_vars"));
3172
3173 elf_i386_set_tls_module_base (info);
3174
3175 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3176
3177 rel = relocs;
3178 relend = relocs + input_section->reloc_count;
3179 for (; rel < relend; rel++)
3180 {
3181 unsigned int r_type;
3182 reloc_howto_type *howto;
3183 unsigned long r_symndx;
3184 struct elf_link_hash_entry *h;
3185 Elf_Internal_Sym *sym;
3186 asection *sec;
3187 bfd_vma off, offplt;
3188 bfd_vma relocation;
3189 bfd_boolean unresolved_reloc;
3190 bfd_reloc_status_type r;
3191 unsigned int indx;
3192 int tls_type;
3193 bfd_vma st_size;
3194
3195 r_type = ELF32_R_TYPE (rel->r_info);
3196 if (r_type == R_386_GNU_VTINHERIT
3197 || r_type == R_386_GNU_VTENTRY)
3198 continue;
3199
3200 if ((indx = r_type) >= R_386_standard
3201 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3202 >= R_386_ext - R_386_standard)
3203 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3204 >= R_386_irelative - R_386_ext))
3205 {
3206 (*_bfd_error_handler)
3207 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3208 input_bfd, input_section, r_type);
3209 bfd_set_error (bfd_error_bad_value);
3210 return FALSE;
3211 }
3212 howto = elf_howto_table + indx;
3213
3214 r_symndx = ELF32_R_SYM (rel->r_info);
3215 h = NULL;
3216 sym = NULL;
3217 sec = NULL;
3218 unresolved_reloc = FALSE;
3219 if (r_symndx < symtab_hdr->sh_info)
3220 {
3221 sym = local_syms + r_symndx;
3222 sec = local_sections[r_symndx];
3223 relocation = (sec->output_section->vma
3224 + sec->output_offset
3225 + sym->st_value);
3226 st_size = sym->st_size;
3227
3228 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3229 && ((sec->flags & SEC_MERGE) != 0
3230 || (info->relocatable
3231 && sec->output_offset != 0)))
3232 {
3233 bfd_vma addend;
3234 bfd_byte *where = contents + rel->r_offset;
3235
3236 switch (howto->size)
3237 {
3238 case 0:
3239 addend = bfd_get_8 (input_bfd, where);
3240 if (howto->pc_relative)
3241 {
3242 addend = (addend ^ 0x80) - 0x80;
3243 addend += 1;
3244 }
3245 break;
3246 case 1:
3247 addend = bfd_get_16 (input_bfd, where);
3248 if (howto->pc_relative)
3249 {
3250 addend = (addend ^ 0x8000) - 0x8000;
3251 addend += 2;
3252 }
3253 break;
3254 case 2:
3255 addend = bfd_get_32 (input_bfd, where);
3256 if (howto->pc_relative)
3257 {
3258 addend = (addend ^ 0x80000000) - 0x80000000;
3259 addend += 4;
3260 }
3261 break;
3262 default:
3263 abort ();
3264 }
3265
3266 if (info->relocatable)
3267 addend += sec->output_offset;
3268 else
3269 {
3270 asection *msec = sec;
3271 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3272 addend);
3273 addend -= relocation;
3274 addend += msec->output_section->vma + msec->output_offset;
3275 }
3276
3277 switch (howto->size)
3278 {
3279 case 0:
3280 /* FIXME: overflow checks. */
3281 if (howto->pc_relative)
3282 addend -= 1;
3283 bfd_put_8 (input_bfd, addend, where);
3284 break;
3285 case 1:
3286 if (howto->pc_relative)
3287 addend -= 2;
3288 bfd_put_16 (input_bfd, addend, where);
3289 break;
3290 case 2:
3291 if (howto->pc_relative)
3292 addend -= 4;
3293 bfd_put_32 (input_bfd, addend, where);
3294 break;
3295 }
3296 }
3297 else if (!info->relocatable
3298 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3299 {
3300 /* Relocate against local STT_GNU_IFUNC symbol. */
3301 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3302 FALSE);
3303 if (h == NULL)
3304 abort ();
3305
3306 /* Set STT_GNU_IFUNC symbol value. */
3307 h->root.u.def.value = sym->st_value;
3308 h->root.u.def.section = sec;
3309 }
3310 }
3311 else
3312 {
3313 bfd_boolean warned ATTRIBUTE_UNUSED;
3314
3315 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3316 r_symndx, symtab_hdr, sym_hashes,
3317 h, sec, relocation,
3318 unresolved_reloc, warned);
3319 st_size = h->size;
3320 }
3321
3322 if (sec != NULL && discarded_section (sec))
3323 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3324 rel, 1, relend, howto, 0, contents);
3325
3326 if (info->relocatable)
3327 continue;
3328
3329 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3330 it here if it is defined in a non-shared object. */
3331 if (h != NULL
3332 && h->type == STT_GNU_IFUNC
3333 && h->def_regular)
3334 {
3335 asection *plt, *gotplt, *base_got;
3336 bfd_vma plt_index;
3337 const char *name;
3338
3339 if ((input_section->flags & SEC_ALLOC) == 0
3340 || h->plt.offset == (bfd_vma) -1)
3341 abort ();
3342
3343 /* STT_GNU_IFUNC symbol must go through PLT. */
3344 if (htab->elf.splt != NULL)
3345 {
3346 plt = htab->elf.splt;
3347 gotplt = htab->elf.sgotplt;
3348 }
3349 else
3350 {
3351 plt = htab->elf.iplt;
3352 gotplt = htab->elf.igotplt;
3353 }
3354
3355 relocation = (plt->output_section->vma
3356 + plt->output_offset + h->plt.offset);
3357
3358 switch (r_type)
3359 {
3360 default:
3361 if (h->root.root.string)
3362 name = h->root.root.string;
3363 else
3364 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3365 NULL);
3366 (*_bfd_error_handler)
3367 (_("%B: relocation %s against STT_GNU_IFUNC "
3368 "symbol `%s' isn't handled by %s"), input_bfd,
3369 elf_howto_table[r_type].name,
3370 name, __FUNCTION__);
3371 bfd_set_error (bfd_error_bad_value);
3372 return FALSE;
3373
3374 case R_386_32:
3375 /* Generate dynamic relcoation only when there is a
3376 non-GOT reference in a shared object. */
3377 if (info->shared && h->non_got_ref)
3378 {
3379 Elf_Internal_Rela outrel;
3380 asection *sreloc;
3381 bfd_vma offset;
3382
3383 /* Need a dynamic relocation to get the real function
3384 adddress. */
3385 offset = _bfd_elf_section_offset (output_bfd,
3386 info,
3387 input_section,
3388 rel->r_offset);
3389 if (offset == (bfd_vma) -1
3390 || offset == (bfd_vma) -2)
3391 abort ();
3392
3393 outrel.r_offset = (input_section->output_section->vma
3394 + input_section->output_offset
3395 + offset);
3396
3397 if (h->dynindx == -1
3398 || h->forced_local
3399 || info->executable)
3400 {
3401 /* This symbol is resolved locally. */
3402 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3403 bfd_put_32 (output_bfd,
3404 (h->root.u.def.value
3405 + h->root.u.def.section->output_section->vma
3406 + h->root.u.def.section->output_offset),
3407 contents + offset);
3408 }
3409 else
3410 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3411
3412 sreloc = htab->elf.irelifunc;
3413 elf_append_rel (output_bfd, sreloc, &outrel);
3414
3415 /* If this reloc is against an external symbol, we
3416 do not want to fiddle with the addend. Otherwise,
3417 we need to include the symbol value so that it
3418 becomes an addend for the dynamic reloc. For an
3419 internal symbol, we have updated addend. */
3420 continue;
3421 }
3422 /* FALLTHROUGH */
3423 case R_386_PC32:
3424 case R_386_PLT32:
3425 goto do_relocation;
3426
3427 case R_386_GOT32:
3428 base_got = htab->elf.sgot;
3429 off = h->got.offset;
3430
3431 if (base_got == NULL)
3432 abort ();
3433
3434 if (off == (bfd_vma) -1)
3435 {
3436 /* We can't use h->got.offset here to save state, or
3437 even just remember the offset, as finish_dynamic_symbol
3438 would use that as offset into .got. */
3439
3440 if (htab->elf.splt != NULL)
3441 {
3442 plt_index = h->plt.offset / plt_entry_size - 1;
3443 off = (plt_index + 3) * 4;
3444 base_got = htab->elf.sgotplt;
3445 }
3446 else
3447 {
3448 plt_index = h->plt.offset / plt_entry_size;
3449 off = plt_index * 4;
3450 base_got = htab->elf.igotplt;
3451 }
3452
3453 if (h->dynindx == -1
3454 || h->forced_local
3455 || info->symbolic)
3456 {
3457 /* This references the local defitionion. We must
3458 initialize this entry in the global offset table.
3459 Since the offset must always be a multiple of 8,
3460 we use the least significant bit to record
3461 whether we have initialized it already.
3462
3463 When doing a dynamic link, we create a .rela.got
3464 relocation entry to initialize the value. This
3465 is done in the finish_dynamic_symbol routine. */
3466 if ((off & 1) != 0)
3467 off &= ~1;
3468 else
3469 {
3470 bfd_put_32 (output_bfd, relocation,
3471 base_got->contents + off);
3472 h->got.offset |= 1;
3473 }
3474 }
3475
3476 relocation = off;
3477
3478 /* Adjust for static executables. */
3479 if (htab->elf.splt == NULL)
3480 relocation += gotplt->output_offset;
3481 }
3482 else
3483 {
3484 relocation = (base_got->output_section->vma
3485 + base_got->output_offset + off
3486 - gotplt->output_section->vma
3487 - gotplt->output_offset);
3488 /* Adjust for static executables. */
3489 if (htab->elf.splt == NULL)
3490 relocation += gotplt->output_offset;
3491 }
3492
3493 goto do_relocation;
3494
3495 case R_386_GOTOFF:
3496 relocation -= (gotplt->output_section->vma
3497 + gotplt->output_offset);
3498 goto do_relocation;
3499 }
3500 }
3501
3502 switch (r_type)
3503 {
3504 case R_386_GOT32:
3505 /* Relocation is to the entry for this symbol in the global
3506 offset table. */
3507 if (htab->elf.sgot == NULL)
3508 abort ();
3509
3510 if (h != NULL)
3511 {
3512 bfd_boolean dyn;
3513
3514 off = h->got.offset;
3515 dyn = htab->elf.dynamic_sections_created;
3516 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3517 || (info->shared
3518 && SYMBOL_REFERENCES_LOCAL (info, h))
3519 || (ELF_ST_VISIBILITY (h->other)
3520 && h->root.type == bfd_link_hash_undefweak))
3521 {
3522 /* This is actually a static link, or it is a
3523 -Bsymbolic link and the symbol is defined
3524 locally, or the symbol was forced to be local
3525 because of a version file. We must initialize
3526 this entry in the global offset table. Since the
3527 offset must always be a multiple of 4, we use the
3528 least significant bit to record whether we have
3529 initialized it already.
3530
3531 When doing a dynamic link, we create a .rel.got
3532 relocation entry to initialize the value. This
3533 is done in the finish_dynamic_symbol routine. */
3534 if ((off & 1) != 0)
3535 off &= ~1;
3536 else
3537 {
3538 bfd_put_32 (output_bfd, relocation,
3539 htab->elf.sgot->contents + off);
3540 h->got.offset |= 1;
3541 }
3542 }
3543 else
3544 unresolved_reloc = FALSE;
3545 }
3546 else
3547 {
3548 if (local_got_offsets == NULL)
3549 abort ();
3550
3551 off = local_got_offsets[r_symndx];
3552
3553 /* The offset must always be a multiple of 4. We use
3554 the least significant bit to record whether we have
3555 already generated the necessary reloc. */
3556 if ((off & 1) != 0)
3557 off &= ~1;
3558 else
3559 {
3560 bfd_put_32 (output_bfd, relocation,
3561 htab->elf.sgot->contents + off);
3562
3563 if (info->shared)
3564 {
3565 asection *s;
3566 Elf_Internal_Rela outrel;
3567
3568 s = htab->elf.srelgot;
3569 if (s == NULL)
3570 abort ();
3571
3572 outrel.r_offset = (htab->elf.sgot->output_section->vma
3573 + htab->elf.sgot->output_offset
3574 + off);
3575 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3576 elf_append_rel (output_bfd, s, &outrel);
3577 }
3578
3579 local_got_offsets[r_symndx] |= 1;
3580 }
3581 }
3582
3583 if (off >= (bfd_vma) -2)
3584 abort ();
3585
3586 relocation = htab->elf.sgot->output_section->vma
3587 + htab->elf.sgot->output_offset + off
3588 - htab->elf.sgotplt->output_section->vma
3589 - htab->elf.sgotplt->output_offset;
3590 break;
3591
3592 case R_386_GOTOFF:
3593 /* Relocation is relative to the start of the global offset
3594 table. */
3595
3596 /* Check to make sure it isn't a protected function symbol
3597 for shared library since it may not be local when used
3598 as function address. We also need to make sure that a
3599 symbol is defined locally. */
3600 if (info->shared && h)
3601 {
3602 if (!h->def_regular)
3603 {
3604 const char *v;
3605
3606 switch (ELF_ST_VISIBILITY (h->other))
3607 {
3608 case STV_HIDDEN:
3609 v = _("hidden symbol");
3610 break;
3611 case STV_INTERNAL:
3612 v = _("internal symbol");
3613 break;
3614 case STV_PROTECTED:
3615 v = _("protected symbol");
3616 break;
3617 default:
3618 v = _("symbol");
3619 break;
3620 }
3621
3622 (*_bfd_error_handler)
3623 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3624 input_bfd, v, h->root.root.string);
3625 bfd_set_error (bfd_error_bad_value);
3626 return FALSE;
3627 }
3628 else if (!info->executable
3629 && !SYMBOLIC_BIND (info, h)
3630 && h->type == STT_FUNC
3631 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3632 {
3633 (*_bfd_error_handler)
3634 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3635 input_bfd, h->root.root.string);
3636 bfd_set_error (bfd_error_bad_value);
3637 return FALSE;
3638 }
3639 }
3640
3641 /* Note that sgot is not involved in this
3642 calculation. We always want the start of .got.plt. If we
3643 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3644 permitted by the ABI, we might have to change this
3645 calculation. */
3646 relocation -= htab->elf.sgotplt->output_section->vma
3647 + htab->elf.sgotplt->output_offset;
3648 break;
3649
3650 case R_386_GOTPC:
3651 /* Use global offset table as symbol value. */
3652 relocation = htab->elf.sgotplt->output_section->vma
3653 + htab->elf.sgotplt->output_offset;
3654 unresolved_reloc = FALSE;
3655 break;
3656
3657 case R_386_PLT32:
3658 /* Relocation is to the entry for this symbol in the
3659 procedure linkage table. */
3660
3661 /* Resolve a PLT32 reloc against a local symbol directly,
3662 without using the procedure linkage table. */
3663 if (h == NULL)
3664 break;
3665
3666 if (h->plt.offset == (bfd_vma) -1
3667 || htab->elf.splt == NULL)
3668 {
3669 /* We didn't make a PLT entry for this symbol. This
3670 happens when statically linking PIC code, or when
3671 using -Bsymbolic. */
3672 break;
3673 }
3674
3675 relocation = (htab->elf.splt->output_section->vma
3676 + htab->elf.splt->output_offset
3677 + h->plt.offset);
3678 unresolved_reloc = FALSE;
3679 break;
3680
3681 case R_386_SIZE32:
3682 /* Set to symbol size. */
3683 relocation = st_size;
3684 /* Fall through. */
3685
3686 case R_386_32:
3687 case R_386_PC32:
3688 if ((input_section->flags & SEC_ALLOC) == 0
3689 || is_vxworks_tls)
3690 break;
3691
3692 if ((info->shared
3693 && (h == NULL
3694 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3695 || h->root.type != bfd_link_hash_undefweak)
3696 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3697 || !SYMBOL_CALLS_LOCAL (info, h)))
3698 || (ELIMINATE_COPY_RELOCS
3699 && !info->shared
3700 && h != NULL
3701 && h->dynindx != -1
3702 && !h->non_got_ref
3703 && ((h->def_dynamic
3704 && !h->def_regular)
3705 || h->root.type == bfd_link_hash_undefweak
3706 || h->root.type == bfd_link_hash_undefined)))
3707 {
3708 Elf_Internal_Rela outrel;
3709 bfd_boolean skip, relocate;
3710 asection *sreloc;
3711
3712 /* When generating a shared object, these relocations
3713 are copied into the output file to be resolved at run
3714 time. */
3715
3716 skip = FALSE;
3717 relocate = FALSE;
3718
3719 outrel.r_offset =
3720 _bfd_elf_section_offset (output_bfd, info, input_section,
3721 rel->r_offset);
3722 if (outrel.r_offset == (bfd_vma) -1)
3723 skip = TRUE;
3724 else if (outrel.r_offset == (bfd_vma) -2)
3725 skip = TRUE, relocate = TRUE;
3726 outrel.r_offset += (input_section->output_section->vma
3727 + input_section->output_offset);
3728
3729 if (skip)
3730 memset (&outrel, 0, sizeof outrel);
3731 else if (h != NULL
3732 && h->dynindx != -1
3733 && (r_type == R_386_PC32
3734 || !info->shared
3735 || !SYMBOLIC_BIND (info, h)
3736 || !h->def_regular))
3737 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3738 else
3739 {
3740 /* This symbol is local, or marked to become local. */
3741 relocate = TRUE;
3742 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3743 }
3744
3745 sreloc = elf_section_data (input_section)->sreloc;
3746
3747 if (sreloc == NULL || sreloc->contents == NULL)
3748 {
3749 r = bfd_reloc_notsupported;
3750 goto check_relocation_error;
3751 }
3752
3753 elf_append_rel (output_bfd, sreloc, &outrel);
3754
3755 /* If this reloc is against an external symbol, we do
3756 not want to fiddle with the addend. Otherwise, we
3757 need to include the symbol value so that it becomes
3758 an addend for the dynamic reloc. */
3759 if (! relocate)
3760 continue;
3761 }
3762 break;
3763
3764 case R_386_TLS_IE:
3765 if (!info->executable)
3766 {
3767 Elf_Internal_Rela outrel;
3768 asection *sreloc;
3769
3770 outrel.r_offset = rel->r_offset
3771 + input_section->output_section->vma
3772 + input_section->output_offset;
3773 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3774 sreloc = elf_section_data (input_section)->sreloc;
3775 if (sreloc == NULL)
3776 abort ();
3777 elf_append_rel (output_bfd, sreloc, &outrel);
3778 }
3779 /* Fall through */
3780
3781 case R_386_TLS_GD:
3782 case R_386_TLS_GOTDESC:
3783 case R_386_TLS_DESC_CALL:
3784 case R_386_TLS_IE_32:
3785 case R_386_TLS_GOTIE:
3786 tls_type = GOT_UNKNOWN;
3787 if (h == NULL && local_got_offsets)
3788 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3789 else if (h != NULL)
3790 tls_type = elf_i386_hash_entry(h)->tls_type;
3791 if (tls_type == GOT_TLS_IE)
3792 tls_type = GOT_TLS_IE_NEG;
3793
3794 if (! elf_i386_tls_transition (info, input_bfd,
3795 input_section, contents,
3796 symtab_hdr, sym_hashes,
3797 &r_type, tls_type, rel,
3798 relend, h, r_symndx))
3799 return FALSE;
3800
3801 if (r_type == R_386_TLS_LE_32)
3802 {
3803 BFD_ASSERT (! unresolved_reloc);
3804 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3805 {
3806 unsigned int type;
3807 bfd_vma roff;
3808
3809 /* GD->LE transition. */
3810 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3811 if (type == 0x04)
3812 {
3813 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3814 Change it into:
3815 movl %gs:0, %eax; subl $foo@tpoff, %eax
3816 (6 byte form of subl). */
3817 memcpy (contents + rel->r_offset - 3,
3818 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3819 roff = rel->r_offset + 5;
3820 }
3821 else
3822 {
3823 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3824 Change it into:
3825 movl %gs:0, %eax; subl $foo@tpoff, %eax
3826 (6 byte form of subl). */
3827 memcpy (contents + rel->r_offset - 2,
3828 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3829 roff = rel->r_offset + 6;
3830 }
3831 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3832 contents + roff);
3833 /* Skip R_386_PC32/R_386_PLT32. */
3834 rel++;
3835 continue;
3836 }
3837 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3838 {
3839 /* GDesc -> LE transition.
3840 It's originally something like:
3841 leal x@tlsdesc(%ebx), %eax
3842
3843 leal x@ntpoff, %eax
3844
3845 Registers other than %eax may be set up here. */
3846
3847 unsigned int val;
3848 bfd_vma roff;
3849
3850 roff = rel->r_offset;
3851 val = bfd_get_8 (input_bfd, contents + roff - 1);
3852
3853 /* Now modify the instruction as appropriate. */
3854 /* aoliva FIXME: remove the above and xor the byte
3855 below with 0x86. */
3856 bfd_put_8 (output_bfd, val ^ 0x86,
3857 contents + roff - 1);
3858 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3859 contents + roff);
3860 continue;
3861 }
3862 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3863 {
3864 /* GDesc -> LE transition.
3865 It's originally:
3866 call *(%eax)
3867 Turn it into:
3868 xchg %ax,%ax */
3869
3870 bfd_vma roff;
3871
3872 roff = rel->r_offset;
3873 bfd_put_8 (output_bfd, 0x66, contents + roff);
3874 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3875 continue;
3876 }
3877 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3878 {
3879 unsigned int val;
3880
3881 /* IE->LE transition:
3882 Originally it can be one of:
3883 movl foo, %eax
3884 movl foo, %reg
3885 addl foo, %reg
3886 We change it into:
3887 movl $foo, %eax
3888 movl $foo, %reg
3889 addl $foo, %reg. */
3890 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3891 if (val == 0xa1)
3892 {
3893 /* movl foo, %eax. */
3894 bfd_put_8 (output_bfd, 0xb8,
3895 contents + rel->r_offset - 1);
3896 }
3897 else
3898 {
3899 unsigned int type;
3900
3901 type = bfd_get_8 (input_bfd,
3902 contents + rel->r_offset - 2);
3903 switch (type)
3904 {
3905 case 0x8b:
3906 /* movl */
3907 bfd_put_8 (output_bfd, 0xc7,
3908 contents + rel->r_offset - 2);
3909 bfd_put_8 (output_bfd,
3910 0xc0 | ((val >> 3) & 7),
3911 contents + rel->r_offset - 1);
3912 break;
3913 case 0x03:
3914 /* addl */
3915 bfd_put_8 (output_bfd, 0x81,
3916 contents + rel->r_offset - 2);
3917 bfd_put_8 (output_bfd,
3918 0xc0 | ((val >> 3) & 7),
3919 contents + rel->r_offset - 1);
3920 break;
3921 default:
3922 BFD_FAIL ();
3923 break;
3924 }
3925 }
3926 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3927 contents + rel->r_offset);
3928 continue;
3929 }
3930 else
3931 {
3932 unsigned int val, type;
3933
3934 /* {IE_32,GOTIE}->LE transition:
3935 Originally it can be one of:
3936 subl foo(%reg1), %reg2
3937 movl foo(%reg1), %reg2
3938 addl foo(%reg1), %reg2
3939 We change it into:
3940 subl $foo, %reg2
3941 movl $foo, %reg2 (6 byte form)
3942 addl $foo, %reg2. */
3943 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3944 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3945 if (type == 0x8b)
3946 {
3947 /* movl */
3948 bfd_put_8 (output_bfd, 0xc7,
3949 contents + rel->r_offset - 2);
3950 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3951 contents + rel->r_offset - 1);
3952 }
3953 else if (type == 0x2b)
3954 {
3955 /* subl */
3956 bfd_put_8 (output_bfd, 0x81,
3957 contents + rel->r_offset - 2);
3958 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3959 contents + rel->r_offset - 1);
3960 }
3961 else if (type == 0x03)
3962 {
3963 /* addl */
3964 bfd_put_8 (output_bfd, 0x81,
3965 contents + rel->r_offset - 2);
3966 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3967 contents + rel->r_offset - 1);
3968 }
3969 else
3970 BFD_FAIL ();
3971 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3972 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3973 contents + rel->r_offset);
3974 else
3975 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3976 contents + rel->r_offset);
3977 continue;
3978 }
3979 }
3980
3981 if (htab->elf.sgot == NULL)
3982 abort ();
3983
3984 if (h != NULL)
3985 {
3986 off = h->got.offset;
3987 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3988 }
3989 else
3990 {
3991 if (local_got_offsets == NULL)
3992 abort ();
3993
3994 off = local_got_offsets[r_symndx];
3995 offplt = local_tlsdesc_gotents[r_symndx];
3996 }
3997
3998 if ((off & 1) != 0)
3999 off &= ~1;
4000 else
4001 {
4002 Elf_Internal_Rela outrel;
4003 int dr_type;
4004 asection *sreloc;
4005
4006 if (htab->elf.srelgot == NULL)
4007 abort ();
4008
4009 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4010
4011 if (GOT_TLS_GDESC_P (tls_type))
4012 {
4013 bfd_byte *loc;
4014 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4015 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4016 <= htab->elf.sgotplt->size);
4017 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4018 + htab->elf.sgotplt->output_offset
4019 + offplt
4020 + htab->sgotplt_jump_table_size);
4021 sreloc = htab->elf.srelplt;
4022 loc = sreloc->contents;
4023 loc += (htab->next_tls_desc_index++
4024 * sizeof (Elf32_External_Rel));
4025 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4026 <= sreloc->contents + sreloc->size);
4027 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4028 if (indx == 0)
4029 {
4030 BFD_ASSERT (! unresolved_reloc);
4031 bfd_put_32 (output_bfd,
4032 relocation - elf_i386_dtpoff_base (info),
4033 htab->elf.sgotplt->contents + offplt
4034 + htab->sgotplt_jump_table_size + 4);
4035 }
4036 else
4037 {
4038 bfd_put_32 (output_bfd, 0,
4039 htab->elf.sgotplt->contents + offplt
4040 + htab->sgotplt_jump_table_size + 4);
4041 }
4042 }
4043
4044 sreloc = htab->elf.srelgot;
4045
4046 outrel.r_offset = (htab->elf.sgot->output_section->vma
4047 + htab->elf.sgot->output_offset + off);
4048
4049 if (GOT_TLS_GD_P (tls_type))
4050 dr_type = R_386_TLS_DTPMOD32;
4051 else if (GOT_TLS_GDESC_P (tls_type))
4052 goto dr_done;
4053 else if (tls_type == GOT_TLS_IE_POS)
4054 dr_type = R_386_TLS_TPOFF;
4055 else
4056 dr_type = R_386_TLS_TPOFF32;
4057
4058 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4059 bfd_put_32 (output_bfd,
4060 relocation - elf_i386_dtpoff_base (info),
4061 htab->elf.sgot->contents + off);
4062 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4063 bfd_put_32 (output_bfd,
4064 elf_i386_dtpoff_base (info) - relocation,
4065 htab->elf.sgot->contents + off);
4066 else if (dr_type != R_386_TLS_DESC)
4067 bfd_put_32 (output_bfd, 0,
4068 htab->elf.sgot->contents + off);
4069 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4070
4071 elf_append_rel (output_bfd, sreloc, &outrel);
4072
4073 if (GOT_TLS_GD_P (tls_type))
4074 {
4075 if (indx == 0)
4076 {
4077 BFD_ASSERT (! unresolved_reloc);
4078 bfd_put_32 (output_bfd,
4079 relocation - elf_i386_dtpoff_base (info),
4080 htab->elf.sgot->contents + off + 4);
4081 }
4082 else
4083 {
4084 bfd_put_32 (output_bfd, 0,
4085 htab->elf.sgot->contents + off + 4);
4086 outrel.r_info = ELF32_R_INFO (indx,
4087 R_386_TLS_DTPOFF32);
4088 outrel.r_offset += 4;
4089 elf_append_rel (output_bfd, sreloc, &outrel);
4090 }
4091 }
4092 else if (tls_type == GOT_TLS_IE_BOTH)
4093 {
4094 bfd_put_32 (output_bfd,
4095 (indx == 0
4096 ? relocation - elf_i386_dtpoff_base (info)
4097 : 0),
4098 htab->elf.sgot->contents + off + 4);
4099 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4100 outrel.r_offset += 4;
4101 elf_append_rel (output_bfd, sreloc, &outrel);
4102 }
4103
4104 dr_done:
4105 if (h != NULL)
4106 h->got.offset |= 1;
4107 else
4108 local_got_offsets[r_symndx] |= 1;
4109 }
4110
4111 if (off >= (bfd_vma) -2
4112 && ! GOT_TLS_GDESC_P (tls_type))
4113 abort ();
4114 if (r_type == R_386_TLS_GOTDESC
4115 || r_type == R_386_TLS_DESC_CALL)
4116 {
4117 relocation = htab->sgotplt_jump_table_size + offplt;
4118 unresolved_reloc = FALSE;
4119 }
4120 else if (r_type == ELF32_R_TYPE (rel->r_info))
4121 {
4122 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4123 + htab->elf.sgotplt->output_offset;
4124 relocation = htab->elf.sgot->output_section->vma
4125 + htab->elf.sgot->output_offset + off - g_o_t;
4126 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4127 && tls_type == GOT_TLS_IE_BOTH)
4128 relocation += 4;
4129 if (r_type == R_386_TLS_IE)
4130 relocation += g_o_t;
4131 unresolved_reloc = FALSE;
4132 }
4133 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4134 {
4135 unsigned int val, type;
4136 bfd_vma roff;
4137
4138 /* GD->IE transition. */
4139 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4140 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4141 if (type == 0x04)
4142 {
4143 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4144 Change it into:
4145 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4146 val >>= 3;
4147 roff = rel->r_offset - 3;
4148 }
4149 else
4150 {
4151 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4152 Change it into:
4153 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4154 roff = rel->r_offset - 2;
4155 }
4156 memcpy (contents + roff,
4157 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4158 contents[roff + 7] = 0x80 | (val & 7);
4159 /* If foo is used only with foo@gotntpoff(%reg) and
4160 foo@indntpoff, but not with foo@gottpoff(%reg), change
4161 subl $foo@gottpoff(%reg), %eax
4162 into:
4163 addl $foo@gotntpoff(%reg), %eax. */
4164 if (tls_type == GOT_TLS_IE_POS)
4165 contents[roff + 6] = 0x03;
4166 bfd_put_32 (output_bfd,
4167 htab->elf.sgot->output_section->vma
4168 + htab->elf.sgot->output_offset + off
4169 - htab->elf.sgotplt->output_section->vma
4170 - htab->elf.sgotplt->output_offset,
4171 contents + roff + 8);
4172 /* Skip R_386_PLT32. */
4173 rel++;
4174 continue;
4175 }
4176 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4177 {
4178 /* GDesc -> IE transition.
4179 It's originally something like:
4180 leal x@tlsdesc(%ebx), %eax
4181
4182 Change it to:
4183 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4184 or:
4185 movl x@gottpoff(%ebx), %eax # before negl %eax
4186
4187 Registers other than %eax may be set up here. */
4188
4189 bfd_vma roff;
4190
4191 /* First, make sure it's a leal adding ebx to a 32-bit
4192 offset into any register, although it's probably
4193 almost always going to be eax. */
4194 roff = rel->r_offset;
4195
4196 /* Now modify the instruction as appropriate. */
4197 /* To turn a leal into a movl in the form we use it, it
4198 suffices to change the first byte from 0x8d to 0x8b.
4199 aoliva FIXME: should we decide to keep the leal, all
4200 we have to do is remove the statement below, and
4201 adjust the relaxation of R_386_TLS_DESC_CALL. */
4202 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4203
4204 if (tls_type == GOT_TLS_IE_BOTH)
4205 off += 4;
4206
4207 bfd_put_32 (output_bfd,
4208 htab->elf.sgot->output_section->vma
4209 + htab->elf.sgot->output_offset + off
4210 - htab->elf.sgotplt->output_section->vma
4211 - htab->elf.sgotplt->output_offset,
4212 contents + roff);
4213 continue;
4214 }
4215 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4216 {
4217 /* GDesc -> IE transition.
4218 It's originally:
4219 call *(%eax)
4220
4221 Change it to:
4222 xchg %ax,%ax
4223 or
4224 negl %eax
4225 depending on how we transformed the TLS_GOTDESC above.
4226 */
4227
4228 bfd_vma roff;
4229
4230 roff = rel->r_offset;
4231
4232 /* Now modify the instruction as appropriate. */
4233 if (tls_type != GOT_TLS_IE_NEG)
4234 {
4235 /* xchg %ax,%ax */
4236 bfd_put_8 (output_bfd, 0x66, contents + roff);
4237 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4238 }
4239 else
4240 {
4241 /* negl %eax */
4242 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4243 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4244 }
4245
4246 continue;
4247 }
4248 else
4249 BFD_ASSERT (FALSE);
4250 break;
4251
4252 case R_386_TLS_LDM:
4253 if (! elf_i386_tls_transition (info, input_bfd,
4254 input_section, contents,
4255 symtab_hdr, sym_hashes,
4256 &r_type, GOT_UNKNOWN, rel,
4257 relend, h, r_symndx))
4258 return FALSE;
4259
4260 if (r_type != R_386_TLS_LDM)
4261 {
4262 /* LD->LE transition:
4263 leal foo(%reg), %eax; call ___tls_get_addr.
4264 We change it into:
4265 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4266 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4267 memcpy (contents + rel->r_offset - 2,
4268 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4269 /* Skip R_386_PC32/R_386_PLT32. */
4270 rel++;
4271 continue;
4272 }
4273
4274 if (htab->elf.sgot == NULL)
4275 abort ();
4276
4277 off = htab->tls_ldm_got.offset;
4278 if (off & 1)
4279 off &= ~1;
4280 else
4281 {
4282 Elf_Internal_Rela outrel;
4283
4284 if (htab->elf.srelgot == NULL)
4285 abort ();
4286
4287 outrel.r_offset = (htab->elf.sgot->output_section->vma
4288 + htab->elf.sgot->output_offset + off);
4289
4290 bfd_put_32 (output_bfd, 0,
4291 htab->elf.sgot->contents + off);
4292 bfd_put_32 (output_bfd, 0,
4293 htab->elf.sgot->contents + off + 4);
4294 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4295 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4296 htab->tls_ldm_got.offset |= 1;
4297 }
4298 relocation = htab->elf.sgot->output_section->vma
4299 + htab->elf.sgot->output_offset + off
4300 - htab->elf.sgotplt->output_section->vma
4301 - htab->elf.sgotplt->output_offset;
4302 unresolved_reloc = FALSE;
4303 break;
4304
4305 case R_386_TLS_LDO_32:
4306 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4307 relocation -= elf_i386_dtpoff_base (info);
4308 else
4309 /* When converting LDO to LE, we must negate. */
4310 relocation = -elf_i386_tpoff (info, relocation);
4311 break;
4312
4313 case R_386_TLS_LE_32:
4314 case R_386_TLS_LE:
4315 if (!info->executable)
4316 {
4317 Elf_Internal_Rela outrel;
4318 asection *sreloc;
4319
4320 outrel.r_offset = rel->r_offset
4321 + input_section->output_section->vma
4322 + input_section->output_offset;
4323 if (h != NULL && h->dynindx != -1)
4324 indx = h->dynindx;
4325 else
4326 indx = 0;
4327 if (r_type == R_386_TLS_LE_32)
4328 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4329 else
4330 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4331 sreloc = elf_section_data (input_section)->sreloc;
4332 if (sreloc == NULL)
4333 abort ();
4334 elf_append_rel (output_bfd, sreloc, &outrel);
4335 if (indx)
4336 continue;
4337 else if (r_type == R_386_TLS_LE_32)
4338 relocation = elf_i386_dtpoff_base (info) - relocation;
4339 else
4340 relocation -= elf_i386_dtpoff_base (info);
4341 }
4342 else if (r_type == R_386_TLS_LE_32)
4343 relocation = elf_i386_tpoff (info, relocation);
4344 else
4345 relocation = -elf_i386_tpoff (info, relocation);
4346 break;
4347
4348 default:
4349 break;
4350 }
4351
4352 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4353 because such sections are not SEC_ALLOC and thus ld.so will
4354 not process them. */
4355 if (unresolved_reloc
4356 && !((input_section->flags & SEC_DEBUGGING) != 0
4357 && h->def_dynamic)
4358 && _bfd_elf_section_offset (output_bfd, info, input_section,
4359 rel->r_offset) != (bfd_vma) -1)
4360 {
4361 (*_bfd_error_handler)
4362 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4363 input_bfd,
4364 input_section,
4365 (long) rel->r_offset,
4366 howto->name,
4367 h->root.root.string);
4368 return FALSE;
4369 }
4370
4371 do_relocation:
4372 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4373 contents, rel->r_offset,
4374 relocation, 0);
4375
4376 check_relocation_error:
4377 if (r != bfd_reloc_ok)
4378 {
4379 const char *name;
4380
4381 if (h != NULL)
4382 name = h->root.root.string;
4383 else
4384 {
4385 name = bfd_elf_string_from_elf_section (input_bfd,
4386 symtab_hdr->sh_link,
4387 sym->st_name);
4388 if (name == NULL)
4389 return FALSE;
4390 if (*name == '\0')
4391 name = bfd_section_name (input_bfd, sec);
4392 }
4393
4394 if (r == bfd_reloc_overflow)
4395 {
4396 if (! ((*info->callbacks->reloc_overflow)
4397 (info, (h ? &h->root : NULL), name, howto->name,
4398 (bfd_vma) 0, input_bfd, input_section,
4399 rel->r_offset)))
4400 return FALSE;
4401 }
4402 else
4403 {
4404 (*_bfd_error_handler)
4405 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4406 input_bfd, input_section,
4407 (long) rel->r_offset, name, (int) r);
4408 return FALSE;
4409 }
4410 }
4411 }
4412
4413 return TRUE;
4414 }
4415
4416 /* Finish up dynamic symbol handling. We set the contents of various
4417 dynamic sections here. */
4418
4419 static bfd_boolean
4420 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4421 struct bfd_link_info *info,
4422 struct elf_link_hash_entry *h,
4423 Elf_Internal_Sym *sym)
4424 {
4425 struct elf_i386_link_hash_table *htab;
4426 unsigned plt_entry_size;
4427 const struct elf_i386_backend_data *abed;
4428
4429 htab = elf_i386_hash_table (info);
4430 if (htab == NULL)
4431 return FALSE;
4432
4433 abed = get_elf_i386_backend_data (output_bfd);
4434 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4435
4436 if (h->plt.offset != (bfd_vma) -1)
4437 {
4438 bfd_vma plt_index;
4439 bfd_vma got_offset;
4440 Elf_Internal_Rela rel;
4441 bfd_byte *loc;
4442 asection *plt, *gotplt, *relplt;
4443
4444 /* When building a static executable, use .iplt, .igot.plt and
4445 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4446 if (htab->elf.splt != NULL)
4447 {
4448 plt = htab->elf.splt;
4449 gotplt = htab->elf.sgotplt;
4450 relplt = htab->elf.srelplt;
4451 }
4452 else
4453 {
4454 plt = htab->elf.iplt;
4455 gotplt = htab->elf.igotplt;
4456 relplt = htab->elf.irelplt;
4457 }
4458
4459 /* This symbol has an entry in the procedure linkage table. Set
4460 it up. */
4461
4462 if ((h->dynindx == -1
4463 && !((h->forced_local || info->executable)
4464 && h->def_regular
4465 && h->type == STT_GNU_IFUNC))
4466 || plt == NULL
4467 || gotplt == NULL
4468 || relplt == NULL)
4469 abort ();
4470
4471 /* Get the index in the procedure linkage table which
4472 corresponds to this symbol. This is the index of this symbol
4473 in all the symbols for which we are making plt entries. The
4474 first entry in the procedure linkage table is reserved.
4475
4476 Get the offset into the .got table of the entry that
4477 corresponds to this function. Each .got entry is 4 bytes.
4478 The first three are reserved.
4479
4480 For static executables, we don't reserve anything. */
4481
4482 if (plt == htab->elf.splt)
4483 {
4484 got_offset = h->plt.offset / plt_entry_size - 1;
4485 got_offset = (got_offset + 3) * 4;
4486 }
4487 else
4488 {
4489 got_offset = h->plt.offset / plt_entry_size;
4490 got_offset = got_offset * 4;
4491 }
4492
4493 /* Fill in the entry in the procedure linkage table. */
4494 if (! info->shared)
4495 {
4496 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4497 abed->plt->plt_entry_size);
4498 bfd_put_32 (output_bfd,
4499 (gotplt->output_section->vma
4500 + gotplt->output_offset
4501 + got_offset),
4502 plt->contents + h->plt.offset
4503 + abed->plt->plt_got_offset);
4504
4505 if (abed->is_vxworks)
4506 {
4507 int s, k, reloc_index;
4508
4509 /* Create the R_386_32 relocation referencing the GOT
4510 for this PLT entry. */
4511
4512 /* S: Current slot number (zero-based). */
4513 s = ((h->plt.offset - abed->plt->plt_entry_size)
4514 / abed->plt->plt_entry_size);
4515 /* K: Number of relocations for PLTResolve. */
4516 if (info->shared)
4517 k = PLTRESOLVE_RELOCS_SHLIB;
4518 else
4519 k = PLTRESOLVE_RELOCS;
4520 /* Skip the PLTresolve relocations, and the relocations for
4521 the other PLT slots. */
4522 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4523 loc = (htab->srelplt2->contents + reloc_index
4524 * sizeof (Elf32_External_Rel));
4525
4526 rel.r_offset = (htab->elf.splt->output_section->vma
4527 + htab->elf.splt->output_offset
4528 + h->plt.offset + 2),
4529 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4530 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4531
4532 /* Create the R_386_32 relocation referencing the beginning of
4533 the PLT for this GOT entry. */
4534 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4535 + htab->elf.sgotplt->output_offset
4536 + got_offset);
4537 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4538 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4539 loc + sizeof (Elf32_External_Rel));
4540 }
4541 }
4542 else
4543 {
4544 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4545 abed->plt->plt_entry_size);
4546 bfd_put_32 (output_bfd, got_offset,
4547 plt->contents + h->plt.offset
4548 + abed->plt->plt_got_offset);
4549 }
4550
4551 /* Fill in the entry in the global offset table. */
4552 bfd_put_32 (output_bfd,
4553 (plt->output_section->vma
4554 + plt->output_offset
4555 + h->plt.offset
4556 + abed->plt->plt_lazy_offset),
4557 gotplt->contents + got_offset);
4558
4559 /* Fill in the entry in the .rel.plt section. */
4560 rel.r_offset = (gotplt->output_section->vma
4561 + gotplt->output_offset
4562 + got_offset);
4563 if (h->dynindx == -1
4564 || ((info->executable
4565 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4566 && h->def_regular
4567 && h->type == STT_GNU_IFUNC))
4568 {
4569 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4570 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4571 in the .got.plt section. */
4572 bfd_put_32 (output_bfd,
4573 (h->root.u.def.value
4574 + h->root.u.def.section->output_section->vma
4575 + h->root.u.def.section->output_offset),
4576 gotplt->contents + got_offset);
4577 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4578 /* R_386_IRELATIVE comes last. */
4579 plt_index = htab->next_irelative_index--;
4580 }
4581 else
4582 {
4583 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4584 plt_index = htab->next_jump_slot_index++;
4585 }
4586 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4587 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4588
4589 /* Don't fill PLT entry for static executables. */
4590 if (plt == htab->elf.splt)
4591 {
4592 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4593 plt->contents + h->plt.offset
4594 + abed->plt->plt_reloc_offset);
4595 bfd_put_32 (output_bfd, - (h->plt.offset
4596 + abed->plt->plt_plt_offset + 4),
4597 plt->contents + h->plt.offset
4598 + abed->plt->plt_plt_offset);
4599 }
4600
4601 if (!h->def_regular)
4602 {
4603 /* Mark the symbol as undefined, rather than as defined in
4604 the .plt section. Leave the value if there were any
4605 relocations where pointer equality matters (this is a clue
4606 for the dynamic linker, to make function pointer
4607 comparisons work between an application and shared
4608 library), otherwise set it to zero. If a function is only
4609 called from a binary, there is no need to slow down
4610 shared libraries because of that. */
4611 sym->st_shndx = SHN_UNDEF;
4612 if (!h->pointer_equality_needed)
4613 sym->st_value = 0;
4614 }
4615 }
4616
4617 if (h->got.offset != (bfd_vma) -1
4618 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4619 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4620 {
4621 Elf_Internal_Rela rel;
4622
4623 /* This symbol has an entry in the global offset table. Set it
4624 up. */
4625
4626 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4627 abort ();
4628
4629 rel.r_offset = (htab->elf.sgot->output_section->vma
4630 + htab->elf.sgot->output_offset
4631 + (h->got.offset & ~(bfd_vma) 1));
4632
4633 /* If this is a static link, or it is a -Bsymbolic link and the
4634 symbol is defined locally or was forced to be local because
4635 of a version file, we just want to emit a RELATIVE reloc.
4636 The entry in the global offset table will already have been
4637 initialized in the relocate_section function. */
4638 if (h->def_regular
4639 && h->type == STT_GNU_IFUNC)
4640 {
4641 if (info->shared)
4642 {
4643 /* Generate R_386_GLOB_DAT. */
4644 goto do_glob_dat;
4645 }
4646 else
4647 {
4648 asection *plt;
4649
4650 if (!h->pointer_equality_needed)
4651 abort ();
4652
4653 /* For non-shared object, we can't use .got.plt, which
4654 contains the real function addres if we need pointer
4655 equality. We load the GOT entry with the PLT entry. */
4656 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4657 bfd_put_32 (output_bfd,
4658 (plt->output_section->vma
4659 + plt->output_offset + h->plt.offset),
4660 htab->elf.sgot->contents + h->got.offset);
4661 return TRUE;
4662 }
4663 }
4664 else if (info->shared
4665 && SYMBOL_REFERENCES_LOCAL (info, h))
4666 {
4667 BFD_ASSERT((h->got.offset & 1) != 0);
4668 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4669 }
4670 else
4671 {
4672 BFD_ASSERT((h->got.offset & 1) == 0);
4673 do_glob_dat:
4674 bfd_put_32 (output_bfd, (bfd_vma) 0,
4675 htab->elf.sgot->contents + h->got.offset);
4676 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4677 }
4678
4679 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4680 }
4681
4682 if (h->needs_copy)
4683 {
4684 Elf_Internal_Rela rel;
4685
4686 /* This symbol needs a copy reloc. Set it up. */
4687
4688 if (h->dynindx == -1
4689 || (h->root.type != bfd_link_hash_defined
4690 && h->root.type != bfd_link_hash_defweak)
4691 || htab->srelbss == NULL)
4692 abort ();
4693
4694 rel.r_offset = (h->root.u.def.value
4695 + h->root.u.def.section->output_section->vma
4696 + h->root.u.def.section->output_offset);
4697 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4698 elf_append_rel (output_bfd, htab->srelbss, &rel);
4699 }
4700
4701 return TRUE;
4702 }
4703
4704 /* Finish up local dynamic symbol handling. We set the contents of
4705 various dynamic sections here. */
4706
4707 static bfd_boolean
4708 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4709 {
4710 struct elf_link_hash_entry *h
4711 = (struct elf_link_hash_entry *) *slot;
4712 struct bfd_link_info *info
4713 = (struct bfd_link_info *) inf;
4714
4715 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4716 h, NULL);
4717 }
4718
4719 /* Used to decide how to sort relocs in an optimal manner for the
4720 dynamic linker, before writing them out. */
4721
4722 static enum elf_reloc_type_class
4723 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4724 const asection *rel_sec ATTRIBUTE_UNUSED,
4725 const Elf_Internal_Rela *rela)
4726 {
4727 switch (ELF32_R_TYPE (rela->r_info))
4728 {
4729 case R_386_RELATIVE:
4730 return reloc_class_relative;
4731 case R_386_JUMP_SLOT:
4732 return reloc_class_plt;
4733 case R_386_COPY:
4734 return reloc_class_copy;
4735 default:
4736 return reloc_class_normal;
4737 }
4738 }
4739
4740 /* Finish up the dynamic sections. */
4741
4742 static bfd_boolean
4743 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4744 struct bfd_link_info *info)
4745 {
4746 struct elf_i386_link_hash_table *htab;
4747 bfd *dynobj;
4748 asection *sdyn;
4749 const struct elf_i386_backend_data *abed;
4750
4751 htab = elf_i386_hash_table (info);
4752 if (htab == NULL)
4753 return FALSE;
4754
4755 dynobj = htab->elf.dynobj;
4756 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4757 abed = get_elf_i386_backend_data (output_bfd);
4758
4759 if (htab->elf.dynamic_sections_created)
4760 {
4761 Elf32_External_Dyn *dyncon, *dynconend;
4762
4763 if (sdyn == NULL || htab->elf.sgot == NULL)
4764 abort ();
4765
4766 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4767 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4768 for (; dyncon < dynconend; dyncon++)
4769 {
4770 Elf_Internal_Dyn dyn;
4771 asection *s;
4772
4773 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4774
4775 switch (dyn.d_tag)
4776 {
4777 default:
4778 if (abed->is_vxworks
4779 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4780 break;
4781 continue;
4782
4783 case DT_PLTGOT:
4784 s = htab->elf.sgotplt;
4785 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4786 break;
4787
4788 case DT_JMPREL:
4789 s = htab->elf.srelplt;
4790 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4791 break;
4792
4793 case DT_PLTRELSZ:
4794 s = htab->elf.srelplt;
4795 dyn.d_un.d_val = s->size;
4796 break;
4797
4798 case DT_RELSZ:
4799 /* My reading of the SVR4 ABI indicates that the
4800 procedure linkage table relocs (DT_JMPREL) should be
4801 included in the overall relocs (DT_REL). This is
4802 what Solaris does. However, UnixWare can not handle
4803 that case. Therefore, we override the DT_RELSZ entry
4804 here to make it not include the JMPREL relocs. */
4805 s = htab->elf.srelplt;
4806 if (s == NULL)
4807 continue;
4808 dyn.d_un.d_val -= s->size;
4809 break;
4810
4811 case DT_REL:
4812 /* We may not be using the standard ELF linker script.
4813 If .rel.plt is the first .rel section, we adjust
4814 DT_REL to not include it. */
4815 s = htab->elf.srelplt;
4816 if (s == NULL)
4817 continue;
4818 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4819 continue;
4820 dyn.d_un.d_ptr += s->size;
4821 break;
4822 }
4823
4824 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4825 }
4826
4827 /* Fill in the first entry in the procedure linkage table. */
4828 if (htab->elf.splt && htab->elf.splt->size > 0)
4829 {
4830 if (info->shared)
4831 {
4832 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4833 abed->plt->plt0_entry_size);
4834 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4835 abed->plt0_pad_byte,
4836 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4837 }
4838 else
4839 {
4840 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4841 abed->plt->plt0_entry_size);
4842 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4843 abed->plt0_pad_byte,
4844 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4845 bfd_put_32 (output_bfd,
4846 (htab->elf.sgotplt->output_section->vma
4847 + htab->elf.sgotplt->output_offset
4848 + 4),
4849 htab->elf.splt->contents
4850 + abed->plt->plt0_got1_offset);
4851 bfd_put_32 (output_bfd,
4852 (htab->elf.sgotplt->output_section->vma
4853 + htab->elf.sgotplt->output_offset
4854 + 8),
4855 htab->elf.splt->contents
4856 + abed->plt->plt0_got2_offset);
4857
4858 if (abed->is_vxworks)
4859 {
4860 Elf_Internal_Rela rel;
4861
4862 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4863 On IA32 we use REL relocations so the addend goes in
4864 the PLT directly. */
4865 rel.r_offset = (htab->elf.splt->output_section->vma
4866 + htab->elf.splt->output_offset
4867 + abed->plt->plt0_got1_offset);
4868 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4869 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4870 htab->srelplt2->contents);
4871 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4872 rel.r_offset = (htab->elf.splt->output_section->vma
4873 + htab->elf.splt->output_offset
4874 + abed->plt->plt0_got2_offset);
4875 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4876 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4877 htab->srelplt2->contents +
4878 sizeof (Elf32_External_Rel));
4879 }
4880 }
4881
4882 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4883 really seem like the right value. */
4884 elf_section_data (htab->elf.splt->output_section)
4885 ->this_hdr.sh_entsize = 4;
4886
4887 /* Correct the .rel.plt.unloaded relocations. */
4888 if (abed->is_vxworks && !info->shared)
4889 {
4890 int num_plts = (htab->elf.splt->size
4891 / abed->plt->plt_entry_size) - 1;
4892 unsigned char *p;
4893
4894 p = htab->srelplt2->contents;
4895 if (info->shared)
4896 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4897 else
4898 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4899
4900 for (; num_plts; num_plts--)
4901 {
4902 Elf_Internal_Rela rel;
4903 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4904 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4905 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4906 p += sizeof (Elf32_External_Rel);
4907
4908 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4909 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4910 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4911 p += sizeof (Elf32_External_Rel);
4912 }
4913 }
4914 }
4915 }
4916
4917 if (htab->elf.sgotplt)
4918 {
4919 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4920 {
4921 (*_bfd_error_handler)
4922 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4923 return FALSE;
4924 }
4925
4926 /* Fill in the first three entries in the global offset table. */
4927 if (htab->elf.sgotplt->size > 0)
4928 {
4929 bfd_put_32 (output_bfd,
4930 (sdyn == NULL ? 0
4931 : sdyn->output_section->vma + sdyn->output_offset),
4932 htab->elf.sgotplt->contents);
4933 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4934 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4935 }
4936
4937 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4938 }
4939
4940 /* Adjust .eh_frame for .plt section. */
4941 if (htab->plt_eh_frame != NULL
4942 && htab->plt_eh_frame->contents != NULL)
4943 {
4944 if (htab->elf.splt != NULL
4945 && htab->elf.splt->size != 0
4946 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4947 && htab->elf.splt->output_section != NULL
4948 && htab->plt_eh_frame->output_section != NULL)
4949 {
4950 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4951 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4952 + htab->plt_eh_frame->output_offset
4953 + PLT_FDE_START_OFFSET;
4954 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4955 htab->plt_eh_frame->contents
4956 + PLT_FDE_START_OFFSET);
4957 }
4958 if (htab->plt_eh_frame->sec_info_type
4959 == SEC_INFO_TYPE_EH_FRAME)
4960 {
4961 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4962 htab->plt_eh_frame,
4963 htab->plt_eh_frame->contents))
4964 return FALSE;
4965 }
4966 }
4967
4968 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4969 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4970
4971 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4972 htab_traverse (htab->loc_hash_table,
4973 elf_i386_finish_local_dynamic_symbol,
4974 info);
4975
4976 return TRUE;
4977 }
4978
4979 /* Return address for Ith PLT stub in section PLT, for relocation REL
4980 or (bfd_vma) -1 if it should not be included. */
4981
4982 static bfd_vma
4983 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4984 const arelent *rel ATTRIBUTE_UNUSED)
4985 {
4986 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4987 }
4988
4989 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4990
4991 static bfd_boolean
4992 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4993 {
4994 if (h->plt.offset != (bfd_vma) -1
4995 && !h->def_regular
4996 && !h->pointer_equality_needed)
4997 return FALSE;
4998
4999 return _bfd_elf_hash_symbol (h);
5000 }
5001
5002 /* Hook called by the linker routine which adds symbols from an object
5003 file. */
5004
5005 static bfd_boolean
5006 elf_i386_add_symbol_hook (bfd * abfd,
5007 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5008 Elf_Internal_Sym * sym,
5009 const char ** namep ATTRIBUTE_UNUSED,
5010 flagword * flagsp ATTRIBUTE_UNUSED,
5011 asection ** secp ATTRIBUTE_UNUSED,
5012 bfd_vma * valp ATTRIBUTE_UNUSED)
5013 {
5014 if ((abfd->flags & DYNAMIC) == 0
5015 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5016 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5017 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5018
5019 return TRUE;
5020 }
5021
5022 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5023 #define TARGET_LITTLE_NAME "elf32-i386"
5024 #define ELF_ARCH bfd_arch_i386
5025 #define ELF_TARGET_ID I386_ELF_DATA
5026 #define ELF_MACHINE_CODE EM_386
5027 #define ELF_MAXPAGESIZE 0x1000
5028
5029 #define elf_backend_can_gc_sections 1
5030 #define elf_backend_can_refcount 1
5031 #define elf_backend_want_got_plt 1
5032 #define elf_backend_plt_readonly 1
5033 #define elf_backend_want_plt_sym 0
5034 #define elf_backend_got_header_size 12
5035 #define elf_backend_plt_alignment 4
5036
5037 /* Support RELA for objdump of prelink objects. */
5038 #define elf_info_to_howto elf_i386_info_to_howto_rel
5039 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5040
5041 #define bfd_elf32_mkobject elf_i386_mkobject
5042
5043 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5044 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5045 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5046 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5047 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5048
5049 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5050 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5051 #define elf_backend_check_relocs elf_i386_check_relocs
5052 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5053 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5054 #define elf_backend_fake_sections elf_i386_fake_sections
5055 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5056 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5057 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5058 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5059 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5060 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5061 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5062 #define elf_backend_relocate_section elf_i386_relocate_section
5063 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5064 #define elf_backend_always_size_sections elf_i386_always_size_sections
5065 #define elf_backend_omit_section_dynsym \
5066 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5067 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5068 #define elf_backend_hash_symbol elf_i386_hash_symbol
5069 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5070 #undef elf_backend_post_process_headers
5071 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5072
5073 #include "elf32-target.h"
5074
5075 /* FreeBSD support. */
5076
5077 #undef TARGET_LITTLE_SYM
5078 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5079 #undef TARGET_LITTLE_NAME
5080 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5081 #undef ELF_OSABI
5082 #define ELF_OSABI ELFOSABI_FREEBSD
5083
5084 /* The kernel recognizes executables as valid only if they carry a
5085 "FreeBSD" label in the ELF header. So we put this label on all
5086 executables and (for simplicity) also all other object files. */
5087
5088 static void
5089 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5090 {
5091 _bfd_elf_set_osabi (abfd, info);
5092
5093 #ifdef OLD_FREEBSD_ABI_LABEL
5094 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5095 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5096 #endif
5097 }
5098
5099 #undef elf_backend_post_process_headers
5100 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5101 #undef elf32_bed
5102 #define elf32_bed elf32_i386_fbsd_bed
5103
5104 #undef elf_backend_add_symbol_hook
5105
5106 #include "elf32-target.h"
5107
5108 /* Solaris 2. */
5109
5110 #undef TARGET_LITTLE_SYM
5111 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5112 #undef TARGET_LITTLE_NAME
5113 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5114
5115 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5116 objects won't be recognized. */
5117 #undef ELF_OSABI
5118
5119 #undef elf32_bed
5120 #define elf32_bed elf32_i386_sol2_bed
5121
5122 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5123 boundary. */
5124 #undef elf_backend_static_tls_alignment
5125 #define elf_backend_static_tls_alignment 8
5126
5127 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5128
5129 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5130 File, p.63. */
5131 #undef elf_backend_want_plt_sym
5132 #define elf_backend_want_plt_sym 1
5133
5134 #include "elf32-target.h"
5135
5136 /* Native Client support. */
5137
5138 #undef TARGET_LITTLE_SYM
5139 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5140 #undef TARGET_LITTLE_NAME
5141 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5142 #undef elf32_bed
5143 #define elf32_bed elf32_i386_nacl_bed
5144
5145 #undef ELF_MAXPAGESIZE
5146 #define ELF_MAXPAGESIZE 0x10000
5147
5148 /* Restore defaults. */
5149 #undef ELF_OSABI
5150 #undef elf_backend_want_plt_sym
5151 #define elf_backend_want_plt_sym 0
5152 #undef elf_backend_post_process_headers
5153 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5154 #undef elf_backend_static_tls_alignment
5155
5156 /* NaCl uses substantially different PLT entries for the same effects. */
5157
5158 #undef elf_backend_plt_alignment
5159 #define elf_backend_plt_alignment 5
5160 #define NACL_PLT_ENTRY_SIZE 64
5161 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5162
5163 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5164 {
5165 0xff, 0x35, /* pushl contents of address */
5166 0, 0, 0, 0, /* replaced with address of .got + 4. */
5167 0x8b, 0x0d, /* movl contents of address, %ecx */
5168 0, 0, 0, 0, /* replaced with address of .got + 8. */
5169 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5170 0xff, 0xe1 /* jmp *%ecx */
5171 };
5172
5173 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5174 {
5175 0x8b, 0x0d, /* movl contents of address, %ecx */
5176 0, 0, 0, 0, /* replaced with GOT slot address. */
5177 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5178 0xff, 0xe1, /* jmp *%ecx */
5179
5180 /* Pad to the next 32-byte boundary with nop instructions. */
5181 0x90,
5182 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5183 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5184
5185 /* Lazy GOT entries point here (32-byte aligned). */
5186 0x68, /* pushl immediate */
5187 0, 0, 0, 0, /* replaced with reloc offset. */
5188 0xe9, /* jmp relative */
5189 0, 0, 0, 0, /* replaced with offset to .plt. */
5190
5191 /* Pad to the next 32-byte boundary with nop instructions. */
5192 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5193 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5194 0x90, 0x90
5195 };
5196
5197 static const bfd_byte
5198 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5199 {
5200 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5201 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5202 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5203 0xff, 0xe1, /* jmp *%ecx */
5204
5205 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5206 so pad to that size with nop instructions. */
5207 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5208 };
5209
5210 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5211 {
5212 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5213 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5214 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5215 0xff, 0xe1, /* jmp *%ecx */
5216
5217 /* Pad to the next 32-byte boundary with nop instructions. */
5218 0x90,
5219 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5220 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5221
5222 /* Lazy GOT entries point here (32-byte aligned). */
5223 0x68, /* pushl immediate */
5224 0, 0, 0, 0, /* replaced with offset into relocation table. */
5225 0xe9, /* jmp relative */
5226 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5227
5228 /* Pad to the next 32-byte boundary with nop instructions. */
5229 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5230 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5231 0x90, 0x90
5232 };
5233
5234 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5235 {
5236 #if (PLT_CIE_LENGTH != 20 \
5237 || PLT_FDE_LENGTH != 36 \
5238 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5239 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5240 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5241 #endif
5242 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5243 0, 0, 0, 0, /* CIE ID */
5244 1, /* CIE version */
5245 'z', 'R', 0, /* Augmentation string */
5246 1, /* Code alignment factor */
5247 0x7c, /* Data alignment factor: -4 */
5248 8, /* Return address column */
5249 1, /* Augmentation size */
5250 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5251 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5252 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5253 DW_CFA_nop, DW_CFA_nop,
5254
5255 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5256 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5257 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5258 0, 0, 0, 0, /* .plt size goes here */
5259 0, /* Augmentation size */
5260 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5261 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5262 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5263 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5264 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5265 13, /* Block length */
5266 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5267 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5268 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5269 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5270 DW_CFA_nop, DW_CFA_nop
5271 };
5272
5273 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5274 {
5275 elf_i386_nacl_plt0_entry, /* plt0_entry */
5276 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5277 2, /* plt0_got1_offset */
5278 8, /* plt0_got2_offset */
5279 elf_i386_nacl_plt_entry, /* plt_entry */
5280 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5281 2, /* plt_got_offset */
5282 33, /* plt_reloc_offset */
5283 38, /* plt_plt_offset */
5284 32, /* plt_lazy_offset */
5285 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5286 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5287 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5288 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5289 };
5290
5291 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5292 {
5293 &elf_i386_nacl_plt, /* plt */
5294 0x90, /* plt0_pad_byte: nop insn */
5295 0, /* is_vxworks */
5296 };
5297
5298 #undef elf_backend_arch_data
5299 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5300
5301 #undef elf_backend_modify_segment_map
5302 #define elf_backend_modify_segment_map nacl_modify_segment_map
5303 #undef elf_backend_modify_program_headers
5304 #define elf_backend_modify_program_headers nacl_modify_program_headers
5305 #undef elf_backend_final_write_processing
5306 #define elf_backend_final_write_processing nacl_final_write_processing
5307
5308 #include "elf32-target.h"
5309
5310 /* Restore defaults. */
5311 #undef elf_backend_modify_segment_map
5312 #undef elf_backend_modify_program_headers
5313 #undef elf_backend_final_write_processing
5314
5315 /* VxWorks support. */
5316
5317 #undef TARGET_LITTLE_SYM
5318 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5319 #undef TARGET_LITTLE_NAME
5320 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5321 #undef ELF_OSABI
5322 #undef elf_backend_plt_alignment
5323 #define elf_backend_plt_alignment 4
5324
5325 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5326 {
5327 &elf_i386_plt, /* plt */
5328 0x90, /* plt0_pad_byte */
5329 1, /* is_vxworks */
5330 };
5331
5332 #undef elf_backend_arch_data
5333 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5334
5335 #undef elf_backend_relocs_compatible
5336 #undef elf_backend_post_process_headers
5337 #undef elf_backend_add_symbol_hook
5338 #define elf_backend_add_symbol_hook \
5339 elf_vxworks_add_symbol_hook
5340 #undef elf_backend_link_output_symbol_hook
5341 #define elf_backend_link_output_symbol_hook \
5342 elf_vxworks_link_output_symbol_hook
5343 #undef elf_backend_emit_relocs
5344 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5345 #undef elf_backend_final_write_processing
5346 #define elf_backend_final_write_processing \
5347 elf_vxworks_final_write_processing
5348 #undef elf_backend_static_tls_alignment
5349
5350 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5351 define it. */
5352 #undef elf_backend_want_plt_sym
5353 #define elf_backend_want_plt_sym 1
5354
5355 #undef elf32_bed
5356 #define elf32_bed elf32_i386_vxworks_bed
5357
5358 #include "elf32-target.h"
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