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* v850-tdep.c (elf-bfd.h, elf/v850.h): Include.
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 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, 4);
2201 else if (htab->elf.dynamic_sections_created
2202 && h->plt.refcount > 0)
2203 {
2204 /* Make sure this symbol is output as a dynamic symbol.
2205 Undefined weak syms won't yet be marked as dynamic. */
2206 if (h->dynindx == -1
2207 && !h->forced_local)
2208 {
2209 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2210 return FALSE;
2211 }
2212
2213 if (info->shared
2214 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2215 {
2216 asection *s = htab->elf.splt;
2217
2218 /* If this is the first .plt entry, make room for the special
2219 first entry. */
2220 if (s->size == 0)
2221 s->size += plt_entry_size;
2222
2223 h->plt.offset = s->size;
2224
2225 /* If this symbol is not defined in a regular file, and we are
2226 not generating a shared library, then set the symbol to this
2227 location in the .plt. This is required to make function
2228 pointers compare as equal between the normal executable and
2229 the shared library. */
2230 if (! info->shared
2231 && !h->def_regular)
2232 {
2233 h->root.u.def.section = s;
2234 h->root.u.def.value = h->plt.offset;
2235 }
2236
2237 /* Make room for this entry. */
2238 s->size += plt_entry_size;
2239
2240 /* We also need to make an entry in the .got.plt section, which
2241 will be placed in the .got section by the linker script. */
2242 htab->elf.sgotplt->size += 4;
2243
2244 /* We also need to make an entry in the .rel.plt section. */
2245 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2246 htab->elf.srelplt->reloc_count++;
2247
2248 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2249 && !info->shared)
2250 {
2251 /* VxWorks has a second set of relocations for each PLT entry
2252 in executables. They go in a separate relocation section,
2253 which is processed by the kernel loader. */
2254
2255 /* There are two relocations for the initial PLT entry: an
2256 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2257 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2258
2259 if (h->plt.offset == plt_entry_size)
2260 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2261
2262 /* There are two extra relocations for each subsequent PLT entry:
2263 an R_386_32 relocation for the GOT entry, and an R_386_32
2264 relocation for the PLT entry. */
2265
2266 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2267 }
2268 }
2269 else
2270 {
2271 h->plt.offset = (bfd_vma) -1;
2272 h->needs_plt = 0;
2273 }
2274 }
2275 else
2276 {
2277 h->plt.offset = (bfd_vma) -1;
2278 h->needs_plt = 0;
2279 }
2280
2281 eh->tlsdesc_got = (bfd_vma) -1;
2282
2283 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2284 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2285 if (h->got.refcount > 0
2286 && info->executable
2287 && h->dynindx == -1
2288 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2289 h->got.offset = (bfd_vma) -1;
2290 else if (h->got.refcount > 0)
2291 {
2292 asection *s;
2293 bfd_boolean dyn;
2294 int tls_type = elf_i386_hash_entry(h)->tls_type;
2295
2296 /* Make sure this symbol is output as a dynamic symbol.
2297 Undefined weak syms won't yet be marked as dynamic. */
2298 if (h->dynindx == -1
2299 && !h->forced_local)
2300 {
2301 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2302 return FALSE;
2303 }
2304
2305 s = htab->elf.sgot;
2306 if (GOT_TLS_GDESC_P (tls_type))
2307 {
2308 eh->tlsdesc_got = htab->elf.sgotplt->size
2309 - elf_i386_compute_jump_table_size (htab);
2310 htab->elf.sgotplt->size += 8;
2311 h->got.offset = (bfd_vma) -2;
2312 }
2313 if (! GOT_TLS_GDESC_P (tls_type)
2314 || GOT_TLS_GD_P (tls_type))
2315 {
2316 h->got.offset = s->size;
2317 s->size += 4;
2318 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2319 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2320 s->size += 4;
2321 }
2322 dyn = htab->elf.dynamic_sections_created;
2323 /* R_386_TLS_IE_32 needs one dynamic relocation,
2324 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2325 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2326 need two), R_386_TLS_GD needs one if local symbol and two if
2327 global. */
2328 if (tls_type == GOT_TLS_IE_BOTH)
2329 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2330 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2331 || (tls_type & GOT_TLS_IE))
2332 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2333 else if (GOT_TLS_GD_P (tls_type))
2334 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2335 else if (! GOT_TLS_GDESC_P (tls_type)
2336 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2337 || h->root.type != bfd_link_hash_undefweak)
2338 && (info->shared
2339 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2340 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2341 if (GOT_TLS_GDESC_P (tls_type))
2342 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2343 }
2344 else
2345 h->got.offset = (bfd_vma) -1;
2346
2347 if (eh->dyn_relocs == NULL)
2348 return TRUE;
2349
2350 /* In the shared -Bsymbolic case, discard space allocated for
2351 dynamic pc-relative relocs against symbols which turn out to be
2352 defined in regular objects. For the normal shared case, discard
2353 space for pc-relative relocs that have become local due to symbol
2354 visibility changes. */
2355
2356 if (info->shared)
2357 {
2358 /* The only reloc that uses pc_count is R_386_PC32, which will
2359 appear on a call or on something like ".long foo - .". We
2360 want calls to protected symbols to resolve directly to the
2361 function rather than going via the plt. If people want
2362 function pointer comparisons to work as expected then they
2363 should avoid writing assembly like ".long foo - .". */
2364 if (SYMBOL_CALLS_LOCAL (info, h))
2365 {
2366 struct elf_dyn_relocs **pp;
2367
2368 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2369 {
2370 p->count -= p->pc_count;
2371 p->pc_count = 0;
2372 if (p->count == 0)
2373 *pp = p->next;
2374 else
2375 pp = &p->next;
2376 }
2377 }
2378
2379 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2380 {
2381 struct elf_dyn_relocs **pp;
2382 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2383 {
2384 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2385 *pp = p->next;
2386 else
2387 pp = &p->next;
2388 }
2389 }
2390
2391 /* Also discard relocs on undefined weak syms with non-default
2392 visibility. */
2393 if (eh->dyn_relocs != NULL
2394 && h->root.type == bfd_link_hash_undefweak)
2395 {
2396 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2397 eh->dyn_relocs = NULL;
2398
2399 /* Make sure undefined weak symbols are output as a dynamic
2400 symbol in PIEs. */
2401 else if (h->dynindx == -1
2402 && !h->forced_local)
2403 {
2404 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2405 return FALSE;
2406 }
2407 }
2408 }
2409 else if (ELIMINATE_COPY_RELOCS)
2410 {
2411 /* For the non-shared case, discard space for relocs against
2412 symbols which turn out to need copy relocs or are not
2413 dynamic. */
2414
2415 if (!h->non_got_ref
2416 && ((h->def_dynamic
2417 && !h->def_regular)
2418 || (htab->elf.dynamic_sections_created
2419 && (h->root.type == bfd_link_hash_undefweak
2420 || h->root.type == bfd_link_hash_undefined))))
2421 {
2422 /* Make sure this symbol is output as a dynamic symbol.
2423 Undefined weak syms won't yet be marked as dynamic. */
2424 if (h->dynindx == -1
2425 && !h->forced_local)
2426 {
2427 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2428 return FALSE;
2429 }
2430
2431 /* If that succeeded, we know we'll be keeping all the
2432 relocs. */
2433 if (h->dynindx != -1)
2434 goto keep;
2435 }
2436
2437 eh->dyn_relocs = NULL;
2438
2439 keep: ;
2440 }
2441
2442 /* Finally, allocate space. */
2443 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2444 {
2445 asection *sreloc;
2446
2447 sreloc = elf_section_data (p->sec)->sreloc;
2448
2449 BFD_ASSERT (sreloc != NULL);
2450 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2451 }
2452
2453 return TRUE;
2454 }
2455
2456 /* Allocate space in .plt, .got and associated reloc sections for
2457 local dynamic relocs. */
2458
2459 static bfd_boolean
2460 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2461 {
2462 struct elf_link_hash_entry *h
2463 = (struct elf_link_hash_entry *) *slot;
2464
2465 if (h->type != STT_GNU_IFUNC
2466 || !h->def_regular
2467 || !h->ref_regular
2468 || !h->forced_local
2469 || h->root.type != bfd_link_hash_defined)
2470 abort ();
2471
2472 return elf_i386_allocate_dynrelocs (h, inf);
2473 }
2474
2475 /* Find any dynamic relocs that apply to read-only sections. */
2476
2477 static bfd_boolean
2478 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2479 {
2480 struct elf_i386_link_hash_entry *eh;
2481 struct elf_dyn_relocs *p;
2482
2483 /* Skip local IFUNC symbols. */
2484 if (h->forced_local && h->type == STT_GNU_IFUNC)
2485 return TRUE;
2486
2487 eh = (struct elf_i386_link_hash_entry *) h;
2488 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2489 {
2490 asection *s = p->sec->output_section;
2491
2492 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2493 {
2494 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2495
2496 info->flags |= DF_TEXTREL;
2497
2498 if (info->warn_shared_textrel && info->shared)
2499 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2500 p->sec->owner, h->root.root.string,
2501 p->sec);
2502
2503 /* Not an error, just cut short the traversal. */
2504 return FALSE;
2505 }
2506 }
2507 return TRUE;
2508 }
2509
2510 /* Convert
2511 mov foo@GOT(%reg), %reg
2512 to
2513 lea foo@GOTOFF(%reg), %reg
2514 with the local symbol, foo. */
2515
2516 static bfd_boolean
2517 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2518 struct bfd_link_info *link_info)
2519 {
2520 Elf_Internal_Shdr *symtab_hdr;
2521 Elf_Internal_Rela *internal_relocs;
2522 Elf_Internal_Rela *irel, *irelend;
2523 bfd_byte *contents;
2524 struct elf_i386_link_hash_table *htab;
2525 bfd_boolean changed_contents;
2526 bfd_boolean changed_relocs;
2527 bfd_signed_vma *local_got_refcounts;
2528
2529 /* Don't even try to convert non-ELF outputs. */
2530 if (!is_elf_hash_table (link_info->hash))
2531 return FALSE;
2532
2533 /* Nothing to do if there are no codes, no relocations or no output. */
2534 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2535 || sec->reloc_count == 0
2536 || discarded_section (sec))
2537 return TRUE;
2538
2539 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2540
2541 /* Load the relocations for this section. */
2542 internal_relocs = (_bfd_elf_link_read_relocs
2543 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2544 link_info->keep_memory));
2545 if (internal_relocs == NULL)
2546 return FALSE;
2547
2548 htab = elf_i386_hash_table (link_info);
2549 changed_contents = FALSE;
2550 changed_relocs = FALSE;
2551 local_got_refcounts = elf_local_got_refcounts (abfd);
2552
2553 /* Get the section contents. */
2554 if (elf_section_data (sec)->this_hdr.contents != NULL)
2555 contents = elf_section_data (sec)->this_hdr.contents;
2556 else
2557 {
2558 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2559 goto error_return;
2560 }
2561
2562 irelend = internal_relocs + sec->reloc_count;
2563 for (irel = internal_relocs; irel < irelend; irel++)
2564 {
2565 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2566 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2567 unsigned int indx;
2568 struct elf_link_hash_entry *h;
2569
2570 if (r_type != R_386_GOT32)
2571 continue;
2572
2573 /* Get the symbol referred to by the reloc. */
2574 if (r_symndx < symtab_hdr->sh_info)
2575 {
2576 Elf_Internal_Sym *isym;
2577
2578 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2579 abfd, r_symndx);
2580
2581 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2582 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2583 && bfd_get_8 (input_bfd,
2584 contents + irel->r_offset - 2) == 0x8b)
2585 {
2586 bfd_put_8 (output_bfd, 0x8d,
2587 contents + irel->r_offset - 2);
2588 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2589 if (local_got_refcounts != NULL
2590 && local_got_refcounts[r_symndx] > 0)
2591 local_got_refcounts[r_symndx] -= 1;
2592 changed_contents = TRUE;
2593 changed_relocs = TRUE;
2594 }
2595 continue;
2596 }
2597
2598 indx = r_symndx - symtab_hdr->sh_info;
2599 h = elf_sym_hashes (abfd)[indx];
2600 BFD_ASSERT (h != NULL);
2601
2602 while (h->root.type == bfd_link_hash_indirect
2603 || h->root.type == bfd_link_hash_warning)
2604 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2605
2606 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2607 optimizing _DYNAMIC since ld.so may use its link-time address. */
2608 if (h->def_regular
2609 && h->type != STT_GNU_IFUNC
2610 && h != htab->elf.hdynamic
2611 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2612 && bfd_get_8 (input_bfd,
2613 contents + irel->r_offset - 2) == 0x8b)
2614 {
2615 bfd_put_8 (output_bfd, 0x8d,
2616 contents + irel->r_offset - 2);
2617 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2618 if (h->got.refcount > 0)
2619 h->got.refcount -= 1;
2620 changed_contents = TRUE;
2621 changed_relocs = TRUE;
2622 }
2623 }
2624
2625 if (contents != NULL
2626 && elf_section_data (sec)->this_hdr.contents != contents)
2627 {
2628 if (!changed_contents && !link_info->keep_memory)
2629 free (contents);
2630 else
2631 {
2632 /* Cache the section contents for elf_link_input_bfd. */
2633 elf_section_data (sec)->this_hdr.contents = contents;
2634 }
2635 }
2636
2637 if (elf_section_data (sec)->relocs != internal_relocs)
2638 {
2639 if (!changed_relocs)
2640 free (internal_relocs);
2641 else
2642 elf_section_data (sec)->relocs = internal_relocs;
2643 }
2644
2645 return TRUE;
2646
2647 error_return:
2648 if (contents != NULL
2649 && elf_section_data (sec)->this_hdr.contents != contents)
2650 free (contents);
2651 if (internal_relocs != NULL
2652 && elf_section_data (sec)->relocs != internal_relocs)
2653 free (internal_relocs);
2654 return FALSE;
2655 }
2656
2657 /* Set the sizes of the dynamic sections. */
2658
2659 static bfd_boolean
2660 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2661 {
2662 struct elf_i386_link_hash_table *htab;
2663 bfd *dynobj;
2664 asection *s;
2665 bfd_boolean relocs;
2666 bfd *ibfd;
2667
2668 htab = elf_i386_hash_table (info);
2669 if (htab == NULL)
2670 return FALSE;
2671 dynobj = htab->elf.dynobj;
2672 if (dynobj == NULL)
2673 abort ();
2674
2675 if (htab->elf.dynamic_sections_created)
2676 {
2677 /* Set the contents of the .interp section to the interpreter. */
2678 if (info->executable)
2679 {
2680 s = bfd_get_linker_section (dynobj, ".interp");
2681 if (s == NULL)
2682 abort ();
2683 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2684 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2685 }
2686 }
2687
2688 /* Set up .got offsets for local syms, and space for local dynamic
2689 relocs. */
2690 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2691 {
2692 bfd_signed_vma *local_got;
2693 bfd_signed_vma *end_local_got;
2694 char *local_tls_type;
2695 bfd_vma *local_tlsdesc_gotent;
2696 bfd_size_type locsymcount;
2697 Elf_Internal_Shdr *symtab_hdr;
2698 asection *srel;
2699
2700 if (! is_i386_elf (ibfd))
2701 continue;
2702
2703 for (s = ibfd->sections; s != NULL; s = s->next)
2704 {
2705 struct elf_dyn_relocs *p;
2706
2707 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2708 return FALSE;
2709
2710 for (p = ((struct elf_dyn_relocs *)
2711 elf_section_data (s)->local_dynrel);
2712 p != NULL;
2713 p = p->next)
2714 {
2715 if (!bfd_is_abs_section (p->sec)
2716 && bfd_is_abs_section (p->sec->output_section))
2717 {
2718 /* Input section has been discarded, either because
2719 it is a copy of a linkonce section or due to
2720 linker script /DISCARD/, so we'll be discarding
2721 the relocs too. */
2722 }
2723 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2724 && strcmp (p->sec->output_section->name,
2725 ".tls_vars") == 0)
2726 {
2727 /* Relocations in vxworks .tls_vars sections are
2728 handled specially by the loader. */
2729 }
2730 else if (p->count != 0)
2731 {
2732 srel = elf_section_data (p->sec)->sreloc;
2733 srel->size += p->count * sizeof (Elf32_External_Rel);
2734 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2735 && (info->flags & DF_TEXTREL) == 0)
2736 {
2737 info->flags |= DF_TEXTREL;
2738 if (info->warn_shared_textrel && info->shared)
2739 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2740 p->sec->owner, p->sec);
2741 }
2742 }
2743 }
2744 }
2745
2746 local_got = elf_local_got_refcounts (ibfd);
2747 if (!local_got)
2748 continue;
2749
2750 symtab_hdr = &elf_symtab_hdr (ibfd);
2751 locsymcount = symtab_hdr->sh_info;
2752 end_local_got = local_got + locsymcount;
2753 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2754 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2755 s = htab->elf.sgot;
2756 srel = htab->elf.srelgot;
2757 for (; local_got < end_local_got;
2758 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2759 {
2760 *local_tlsdesc_gotent = (bfd_vma) -1;
2761 if (*local_got > 0)
2762 {
2763 if (GOT_TLS_GDESC_P (*local_tls_type))
2764 {
2765 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2766 - elf_i386_compute_jump_table_size (htab);
2767 htab->elf.sgotplt->size += 8;
2768 *local_got = (bfd_vma) -2;
2769 }
2770 if (! GOT_TLS_GDESC_P (*local_tls_type)
2771 || GOT_TLS_GD_P (*local_tls_type))
2772 {
2773 *local_got = s->size;
2774 s->size += 4;
2775 if (GOT_TLS_GD_P (*local_tls_type)
2776 || *local_tls_type == GOT_TLS_IE_BOTH)
2777 s->size += 4;
2778 }
2779 if (info->shared
2780 || GOT_TLS_GD_ANY_P (*local_tls_type)
2781 || (*local_tls_type & GOT_TLS_IE))
2782 {
2783 if (*local_tls_type == GOT_TLS_IE_BOTH)
2784 srel->size += 2 * sizeof (Elf32_External_Rel);
2785 else if (GOT_TLS_GD_P (*local_tls_type)
2786 || ! GOT_TLS_GDESC_P (*local_tls_type))
2787 srel->size += sizeof (Elf32_External_Rel);
2788 if (GOT_TLS_GDESC_P (*local_tls_type))
2789 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2790 }
2791 }
2792 else
2793 *local_got = (bfd_vma) -1;
2794 }
2795 }
2796
2797 if (htab->tls_ldm_got.refcount > 0)
2798 {
2799 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2800 relocs. */
2801 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2802 htab->elf.sgot->size += 8;
2803 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2804 }
2805 else
2806 htab->tls_ldm_got.offset = -1;
2807
2808 /* Allocate global sym .plt and .got entries, and space for global
2809 sym dynamic relocs. */
2810 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2811
2812 /* Allocate .plt and .got entries, and space for local symbols. */
2813 htab_traverse (htab->loc_hash_table,
2814 elf_i386_allocate_local_dynrelocs,
2815 info);
2816
2817 /* For every jump slot reserved in the sgotplt, reloc_count is
2818 incremented. However, when we reserve space for TLS descriptors,
2819 it's not incremented, so in order to compute the space reserved
2820 for them, it suffices to multiply the reloc count by the jump
2821 slot size.
2822
2823 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2824 so that R_386_IRELATIVE entries come last. */
2825 if (htab->elf.srelplt)
2826 {
2827 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2828 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2829 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2830 }
2831 else if (htab->elf.irelplt)
2832 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2833
2834
2835 if (htab->elf.sgotplt)
2836 {
2837 /* Don't allocate .got.plt section if there are no GOT nor PLT
2838 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2839 if ((htab->elf.hgot == NULL
2840 || !htab->elf.hgot->ref_regular_nonweak)
2841 && (htab->elf.sgotplt->size
2842 == get_elf_backend_data (output_bfd)->got_header_size)
2843 && (htab->elf.splt == NULL
2844 || htab->elf.splt->size == 0)
2845 && (htab->elf.sgot == NULL
2846 || htab->elf.sgot->size == 0)
2847 && (htab->elf.iplt == NULL
2848 || htab->elf.iplt->size == 0)
2849 && (htab->elf.igotplt == NULL
2850 || htab->elf.igotplt->size == 0))
2851 htab->elf.sgotplt->size = 0;
2852 }
2853
2854
2855 if (htab->plt_eh_frame != NULL
2856 && htab->elf.splt != NULL
2857 && htab->elf.splt->size != 0
2858 && !bfd_is_abs_section (htab->elf.splt->output_section)
2859 && _bfd_elf_eh_frame_present (info))
2860 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2861
2862 /* We now have determined the sizes of the various dynamic sections.
2863 Allocate memory for them. */
2864 relocs = FALSE;
2865 for (s = dynobj->sections; s != NULL; s = s->next)
2866 {
2867 bfd_boolean strip_section = TRUE;
2868
2869 if ((s->flags & SEC_LINKER_CREATED) == 0)
2870 continue;
2871
2872 if (s == htab->elf.splt
2873 || s == htab->elf.sgot)
2874 {
2875 /* Strip this section if we don't need it; see the
2876 comment below. */
2877 /* We'd like to strip these sections if they aren't needed, but if
2878 we've exported dynamic symbols from them we must leave them.
2879 It's too late to tell BFD to get rid of the symbols. */
2880
2881 if (htab->elf.hplt != NULL)
2882 strip_section = FALSE;
2883 }
2884 else if (s == htab->elf.sgotplt
2885 || s == htab->elf.iplt
2886 || s == htab->elf.igotplt
2887 || s == htab->plt_eh_frame
2888 || s == htab->sdynbss)
2889 {
2890 /* Strip these too. */
2891 }
2892 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2893 {
2894 if (s->size != 0
2895 && s != htab->elf.srelplt
2896 && s != htab->srelplt2)
2897 relocs = TRUE;
2898
2899 /* We use the reloc_count field as a counter if we need
2900 to copy relocs into the output file. */
2901 s->reloc_count = 0;
2902 }
2903 else
2904 {
2905 /* It's not one of our sections, so don't allocate space. */
2906 continue;
2907 }
2908
2909 if (s->size == 0)
2910 {
2911 /* If we don't need this section, strip it from the
2912 output file. This is mostly to handle .rel.bss and
2913 .rel.plt. We must create both sections in
2914 create_dynamic_sections, because they must be created
2915 before the linker maps input sections to output
2916 sections. The linker does that before
2917 adjust_dynamic_symbol is called, and it is that
2918 function which decides whether anything needs to go
2919 into these sections. */
2920 if (strip_section)
2921 s->flags |= SEC_EXCLUDE;
2922 continue;
2923 }
2924
2925 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2926 continue;
2927
2928 /* Allocate memory for the section contents. We use bfd_zalloc
2929 here in case unused entries are not reclaimed before the
2930 section's contents are written out. This should not happen,
2931 but this way if it does, we get a R_386_NONE reloc instead
2932 of garbage. */
2933 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2934 if (s->contents == NULL)
2935 return FALSE;
2936 }
2937
2938 if (htab->plt_eh_frame != NULL
2939 && htab->plt_eh_frame->contents != NULL)
2940 {
2941 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2942 sizeof (elf_i386_eh_frame_plt));
2943 bfd_put_32 (dynobj, htab->elf.splt->size,
2944 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2945 }
2946
2947 if (htab->elf.dynamic_sections_created)
2948 {
2949 /* Add some entries to the .dynamic section. We fill in the
2950 values later, in elf_i386_finish_dynamic_sections, but we
2951 must add the entries now so that we get the correct size for
2952 the .dynamic section. The DT_DEBUG entry is filled in by the
2953 dynamic linker and used by the debugger. */
2954 #define add_dynamic_entry(TAG, VAL) \
2955 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2956
2957 if (info->executable)
2958 {
2959 if (!add_dynamic_entry (DT_DEBUG, 0))
2960 return FALSE;
2961 }
2962
2963 if (htab->elf.splt->size != 0)
2964 {
2965 if (!add_dynamic_entry (DT_PLTGOT, 0)
2966 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2967 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2968 || !add_dynamic_entry (DT_JMPREL, 0))
2969 return FALSE;
2970 }
2971
2972 if (relocs)
2973 {
2974 if (!add_dynamic_entry (DT_REL, 0)
2975 || !add_dynamic_entry (DT_RELSZ, 0)
2976 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2977 return FALSE;
2978
2979 /* If any dynamic relocs apply to a read-only section,
2980 then we need a DT_TEXTREL entry. */
2981 if ((info->flags & DF_TEXTREL) == 0)
2982 elf_link_hash_traverse (&htab->elf,
2983 elf_i386_readonly_dynrelocs, info);
2984
2985 if ((info->flags & DF_TEXTREL) != 0)
2986 {
2987 if (!add_dynamic_entry (DT_TEXTREL, 0))
2988 return FALSE;
2989 }
2990 }
2991 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2992 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2993 return FALSE;
2994 }
2995 #undef add_dynamic_entry
2996
2997 return TRUE;
2998 }
2999
3000 static bfd_boolean
3001 elf_i386_always_size_sections (bfd *output_bfd,
3002 struct bfd_link_info *info)
3003 {
3004 asection *tls_sec = elf_hash_table (info)->tls_sec;
3005
3006 if (tls_sec)
3007 {
3008 struct elf_link_hash_entry *tlsbase;
3009
3010 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3011 "_TLS_MODULE_BASE_",
3012 FALSE, FALSE, FALSE);
3013
3014 if (tlsbase && tlsbase->type == STT_TLS)
3015 {
3016 struct elf_i386_link_hash_table *htab;
3017 struct bfd_link_hash_entry *bh = NULL;
3018 const struct elf_backend_data *bed
3019 = get_elf_backend_data (output_bfd);
3020
3021 htab = elf_i386_hash_table (info);
3022 if (htab == NULL)
3023 return FALSE;
3024
3025 if (!(_bfd_generic_link_add_one_symbol
3026 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3027 tls_sec, 0, NULL, FALSE,
3028 bed->collect, &bh)))
3029 return FALSE;
3030
3031 htab->tls_module_base = bh;
3032
3033 tlsbase = (struct elf_link_hash_entry *)bh;
3034 tlsbase->def_regular = 1;
3035 tlsbase->other = STV_HIDDEN;
3036 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3037 }
3038 }
3039
3040 return TRUE;
3041 }
3042
3043 /* Set the correct type for an x86 ELF section. We do this by the
3044 section name, which is a hack, but ought to work. */
3045
3046 static bfd_boolean
3047 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3048 Elf_Internal_Shdr *hdr,
3049 asection *sec)
3050 {
3051 const char *name;
3052
3053 name = bfd_get_section_name (abfd, sec);
3054
3055 /* This is an ugly, but unfortunately necessary hack that is
3056 needed when producing EFI binaries on x86. It tells
3057 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3058 containing ELF relocation info. We need this hack in order to
3059 be able to generate ELF binaries that can be translated into
3060 EFI applications (which are essentially COFF objects). Those
3061 files contain a COFF ".reloc" section inside an ELFNN object,
3062 which would normally cause BFD to segfault because it would
3063 attempt to interpret this section as containing relocation
3064 entries for section "oc". With this hack enabled, ".reloc"
3065 will be treated as a normal data section, which will avoid the
3066 segfault. However, you won't be able to create an ELFNN binary
3067 with a section named "oc" that needs relocations, but that's
3068 the kind of ugly side-effects you get when detecting section
3069 types based on their names... In practice, this limitation is
3070 unlikely to bite. */
3071 if (strcmp (name, ".reloc") == 0)
3072 hdr->sh_type = SHT_PROGBITS;
3073
3074 return TRUE;
3075 }
3076
3077 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3078 executables. Rather than setting it to the beginning of the TLS
3079 section, we have to set it to the end. This function may be called
3080 multiple times, it is idempotent. */
3081
3082 static void
3083 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3084 {
3085 struct elf_i386_link_hash_table *htab;
3086 struct bfd_link_hash_entry *base;
3087
3088 if (!info->executable)
3089 return;
3090
3091 htab = elf_i386_hash_table (info);
3092 if (htab == NULL)
3093 return;
3094
3095 base = htab->tls_module_base;
3096 if (base == NULL)
3097 return;
3098
3099 base->u.def.value = htab->elf.tls_size;
3100 }
3101
3102 /* Return the base VMA address which should be subtracted from real addresses
3103 when resolving @dtpoff relocation.
3104 This is PT_TLS segment p_vaddr. */
3105
3106 static bfd_vma
3107 elf_i386_dtpoff_base (struct bfd_link_info *info)
3108 {
3109 /* If tls_sec is NULL, we should have signalled an error already. */
3110 if (elf_hash_table (info)->tls_sec == NULL)
3111 return 0;
3112 return elf_hash_table (info)->tls_sec->vma;
3113 }
3114
3115 /* Return the relocation value for @tpoff relocation
3116 if STT_TLS virtual address is ADDRESS. */
3117
3118 static bfd_vma
3119 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3120 {
3121 struct elf_link_hash_table *htab = elf_hash_table (info);
3122 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3123 bfd_vma static_tls_size;
3124
3125 /* If tls_sec is NULL, we should have signalled an error already. */
3126 if (htab->tls_sec == NULL)
3127 return 0;
3128
3129 /* Consider special static TLS alignment requirements. */
3130 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3131 return static_tls_size + htab->tls_sec->vma - address;
3132 }
3133
3134 /* Relocate an i386 ELF section. */
3135
3136 static bfd_boolean
3137 elf_i386_relocate_section (bfd *output_bfd,
3138 struct bfd_link_info *info,
3139 bfd *input_bfd,
3140 asection *input_section,
3141 bfd_byte *contents,
3142 Elf_Internal_Rela *relocs,
3143 Elf_Internal_Sym *local_syms,
3144 asection **local_sections)
3145 {
3146 struct elf_i386_link_hash_table *htab;
3147 Elf_Internal_Shdr *symtab_hdr;
3148 struct elf_link_hash_entry **sym_hashes;
3149 bfd_vma *local_got_offsets;
3150 bfd_vma *local_tlsdesc_gotents;
3151 Elf_Internal_Rela *rel;
3152 Elf_Internal_Rela *relend;
3153 bfd_boolean is_vxworks_tls;
3154 unsigned plt_entry_size;
3155
3156 BFD_ASSERT (is_i386_elf (input_bfd));
3157
3158 htab = elf_i386_hash_table (info);
3159 if (htab == NULL)
3160 return FALSE;
3161 symtab_hdr = &elf_symtab_hdr (input_bfd);
3162 sym_hashes = elf_sym_hashes (input_bfd);
3163 local_got_offsets = elf_local_got_offsets (input_bfd);
3164 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3165 /* We have to handle relocations in vxworks .tls_vars sections
3166 specially, because the dynamic loader is 'weird'. */
3167 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3168 && info->shared
3169 && !strcmp (input_section->output_section->name,
3170 ".tls_vars"));
3171
3172 elf_i386_set_tls_module_base (info);
3173
3174 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3175
3176 rel = relocs;
3177 relend = relocs + input_section->reloc_count;
3178 for (; rel < relend; rel++)
3179 {
3180 unsigned int r_type;
3181 reloc_howto_type *howto;
3182 unsigned long r_symndx;
3183 struct elf_link_hash_entry *h;
3184 Elf_Internal_Sym *sym;
3185 asection *sec;
3186 bfd_vma off, offplt;
3187 bfd_vma relocation;
3188 bfd_boolean unresolved_reloc;
3189 bfd_reloc_status_type r;
3190 unsigned int indx;
3191 int tls_type;
3192 bfd_vma st_size;
3193
3194 r_type = ELF32_R_TYPE (rel->r_info);
3195 if (r_type == R_386_GNU_VTINHERIT
3196 || r_type == R_386_GNU_VTENTRY)
3197 continue;
3198
3199 if ((indx = r_type) >= R_386_standard
3200 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3201 >= R_386_ext - R_386_standard)
3202 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3203 >= R_386_irelative - R_386_ext))
3204 {
3205 (*_bfd_error_handler)
3206 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3207 input_bfd, input_section, r_type);
3208 bfd_set_error (bfd_error_bad_value);
3209 return FALSE;
3210 }
3211 howto = elf_howto_table + indx;
3212
3213 r_symndx = ELF32_R_SYM (rel->r_info);
3214 h = NULL;
3215 sym = NULL;
3216 sec = NULL;
3217 unresolved_reloc = FALSE;
3218 if (r_symndx < symtab_hdr->sh_info)
3219 {
3220 sym = local_syms + r_symndx;
3221 sec = local_sections[r_symndx];
3222 relocation = (sec->output_section->vma
3223 + sec->output_offset
3224 + sym->st_value);
3225 st_size = sym->st_size;
3226
3227 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3228 && ((sec->flags & SEC_MERGE) != 0
3229 || (info->relocatable
3230 && sec->output_offset != 0)))
3231 {
3232 bfd_vma addend;
3233 bfd_byte *where = contents + rel->r_offset;
3234
3235 switch (howto->size)
3236 {
3237 case 0:
3238 addend = bfd_get_8 (input_bfd, where);
3239 if (howto->pc_relative)
3240 {
3241 addend = (addend ^ 0x80) - 0x80;
3242 addend += 1;
3243 }
3244 break;
3245 case 1:
3246 addend = bfd_get_16 (input_bfd, where);
3247 if (howto->pc_relative)
3248 {
3249 addend = (addend ^ 0x8000) - 0x8000;
3250 addend += 2;
3251 }
3252 break;
3253 case 2:
3254 addend = bfd_get_32 (input_bfd, where);
3255 if (howto->pc_relative)
3256 {
3257 addend = (addend ^ 0x80000000) - 0x80000000;
3258 addend += 4;
3259 }
3260 break;
3261 default:
3262 abort ();
3263 }
3264
3265 if (info->relocatable)
3266 addend += sec->output_offset;
3267 else
3268 {
3269 asection *msec = sec;
3270 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3271 addend);
3272 addend -= relocation;
3273 addend += msec->output_section->vma + msec->output_offset;
3274 }
3275
3276 switch (howto->size)
3277 {
3278 case 0:
3279 /* FIXME: overflow checks. */
3280 if (howto->pc_relative)
3281 addend -= 1;
3282 bfd_put_8 (input_bfd, addend, where);
3283 break;
3284 case 1:
3285 if (howto->pc_relative)
3286 addend -= 2;
3287 bfd_put_16 (input_bfd, addend, where);
3288 break;
3289 case 2:
3290 if (howto->pc_relative)
3291 addend -= 4;
3292 bfd_put_32 (input_bfd, addend, where);
3293 break;
3294 }
3295 }
3296 else if (!info->relocatable
3297 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3298 {
3299 /* Relocate against local STT_GNU_IFUNC symbol. */
3300 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3301 FALSE);
3302 if (h == NULL)
3303 abort ();
3304
3305 /* Set STT_GNU_IFUNC symbol value. */
3306 h->root.u.def.value = sym->st_value;
3307 h->root.u.def.section = sec;
3308 }
3309 }
3310 else
3311 {
3312 bfd_boolean warned ATTRIBUTE_UNUSED;
3313
3314 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3315 r_symndx, symtab_hdr, sym_hashes,
3316 h, sec, relocation,
3317 unresolved_reloc, warned);
3318 st_size = h->size;
3319 }
3320
3321 if (sec != NULL && discarded_section (sec))
3322 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3323 rel, 1, relend, howto, 0, contents);
3324
3325 if (info->relocatable)
3326 continue;
3327
3328 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3329 it here if it is defined in a non-shared object. */
3330 if (h != NULL
3331 && h->type == STT_GNU_IFUNC
3332 && h->def_regular)
3333 {
3334 asection *plt, *gotplt, *base_got;
3335 bfd_vma plt_index;
3336 const char *name;
3337
3338 if ((input_section->flags & SEC_ALLOC) == 0
3339 || h->plt.offset == (bfd_vma) -1)
3340 abort ();
3341
3342 /* STT_GNU_IFUNC symbol must go through PLT. */
3343 if (htab->elf.splt != NULL)
3344 {
3345 plt = htab->elf.splt;
3346 gotplt = htab->elf.sgotplt;
3347 }
3348 else
3349 {
3350 plt = htab->elf.iplt;
3351 gotplt = htab->elf.igotplt;
3352 }
3353
3354 relocation = (plt->output_section->vma
3355 + plt->output_offset + h->plt.offset);
3356
3357 switch (r_type)
3358 {
3359 default:
3360 if (h->root.root.string)
3361 name = h->root.root.string;
3362 else
3363 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3364 NULL);
3365 (*_bfd_error_handler)
3366 (_("%B: relocation %s against STT_GNU_IFUNC "
3367 "symbol `%s' isn't handled by %s"), input_bfd,
3368 elf_howto_table[r_type].name,
3369 name, __FUNCTION__);
3370 bfd_set_error (bfd_error_bad_value);
3371 return FALSE;
3372
3373 case R_386_32:
3374 /* Generate dynamic relcoation only when there is a
3375 non-GOT reference in a shared object. */
3376 if (info->shared && h->non_got_ref)
3377 {
3378 Elf_Internal_Rela outrel;
3379 asection *sreloc;
3380 bfd_vma offset;
3381
3382 /* Need a dynamic relocation to get the real function
3383 adddress. */
3384 offset = _bfd_elf_section_offset (output_bfd,
3385 info,
3386 input_section,
3387 rel->r_offset);
3388 if (offset == (bfd_vma) -1
3389 || offset == (bfd_vma) -2)
3390 abort ();
3391
3392 outrel.r_offset = (input_section->output_section->vma
3393 + input_section->output_offset
3394 + offset);
3395
3396 if (h->dynindx == -1
3397 || h->forced_local
3398 || info->executable)
3399 {
3400 /* This symbol is resolved locally. */
3401 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3402 bfd_put_32 (output_bfd,
3403 (h->root.u.def.value
3404 + h->root.u.def.section->output_section->vma
3405 + h->root.u.def.section->output_offset),
3406 contents + offset);
3407 }
3408 else
3409 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3410
3411 sreloc = htab->elf.irelifunc;
3412 elf_append_rel (output_bfd, sreloc, &outrel);
3413
3414 /* If this reloc is against an external symbol, we
3415 do not want to fiddle with the addend. Otherwise,
3416 we need to include the symbol value so that it
3417 becomes an addend for the dynamic reloc. For an
3418 internal symbol, we have updated addend. */
3419 continue;
3420 }
3421 /* FALLTHROUGH */
3422 case R_386_PC32:
3423 case R_386_PLT32:
3424 goto do_relocation;
3425
3426 case R_386_GOT32:
3427 base_got = htab->elf.sgot;
3428 off = h->got.offset;
3429
3430 if (base_got == NULL)
3431 abort ();
3432
3433 if (off == (bfd_vma) -1)
3434 {
3435 /* We can't use h->got.offset here to save state, or
3436 even just remember the offset, as finish_dynamic_symbol
3437 would use that as offset into .got. */
3438
3439 if (htab->elf.splt != NULL)
3440 {
3441 plt_index = h->plt.offset / plt_entry_size - 1;
3442 off = (plt_index + 3) * 4;
3443 base_got = htab->elf.sgotplt;
3444 }
3445 else
3446 {
3447 plt_index = h->plt.offset / plt_entry_size;
3448 off = plt_index * 4;
3449 base_got = htab->elf.igotplt;
3450 }
3451
3452 if (h->dynindx == -1
3453 || h->forced_local
3454 || info->symbolic)
3455 {
3456 /* This references the local defitionion. We must
3457 initialize this entry in the global offset table.
3458 Since the offset must always be a multiple of 8,
3459 we use the least significant bit to record
3460 whether we have initialized it already.
3461
3462 When doing a dynamic link, we create a .rela.got
3463 relocation entry to initialize the value. This
3464 is done in the finish_dynamic_symbol routine. */
3465 if ((off & 1) != 0)
3466 off &= ~1;
3467 else
3468 {
3469 bfd_put_32 (output_bfd, relocation,
3470 base_got->contents + off);
3471 h->got.offset |= 1;
3472 }
3473 }
3474
3475 relocation = off;
3476
3477 /* Adjust for static executables. */
3478 if (htab->elf.splt == NULL)
3479 relocation += gotplt->output_offset;
3480 }
3481 else
3482 {
3483 relocation = (base_got->output_section->vma
3484 + base_got->output_offset + off
3485 - gotplt->output_section->vma
3486 - gotplt->output_offset);
3487 /* Adjust for static executables. */
3488 if (htab->elf.splt == NULL)
3489 relocation += gotplt->output_offset;
3490 }
3491
3492 goto do_relocation;
3493
3494 case R_386_GOTOFF:
3495 relocation -= (gotplt->output_section->vma
3496 + gotplt->output_offset);
3497 goto do_relocation;
3498 }
3499 }
3500
3501 switch (r_type)
3502 {
3503 case R_386_GOT32:
3504 /* Relocation is to the entry for this symbol in the global
3505 offset table. */
3506 if (htab->elf.sgot == NULL)
3507 abort ();
3508
3509 if (h != NULL)
3510 {
3511 bfd_boolean dyn;
3512
3513 off = h->got.offset;
3514 dyn = htab->elf.dynamic_sections_created;
3515 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3516 || (info->shared
3517 && SYMBOL_REFERENCES_LOCAL (info, h))
3518 || (ELF_ST_VISIBILITY (h->other)
3519 && h->root.type == bfd_link_hash_undefweak))
3520 {
3521 /* This is actually a static link, or it is a
3522 -Bsymbolic link and the symbol is defined
3523 locally, or the symbol was forced to be local
3524 because of a version file. We must initialize
3525 this entry in the global offset table. Since the
3526 offset must always be a multiple of 4, we use the
3527 least significant bit to record whether we have
3528 initialized it already.
3529
3530 When doing a dynamic link, we create a .rel.got
3531 relocation entry to initialize the value. This
3532 is done in the finish_dynamic_symbol routine. */
3533 if ((off & 1) != 0)
3534 off &= ~1;
3535 else
3536 {
3537 bfd_put_32 (output_bfd, relocation,
3538 htab->elf.sgot->contents + off);
3539 h->got.offset |= 1;
3540 }
3541 }
3542 else
3543 unresolved_reloc = FALSE;
3544 }
3545 else
3546 {
3547 if (local_got_offsets == NULL)
3548 abort ();
3549
3550 off = local_got_offsets[r_symndx];
3551
3552 /* The offset must always be a multiple of 4. We use
3553 the least significant bit to record whether we have
3554 already generated the necessary reloc. */
3555 if ((off & 1) != 0)
3556 off &= ~1;
3557 else
3558 {
3559 bfd_put_32 (output_bfd, relocation,
3560 htab->elf.sgot->contents + off);
3561
3562 if (info->shared)
3563 {
3564 asection *s;
3565 Elf_Internal_Rela outrel;
3566
3567 s = htab->elf.srelgot;
3568 if (s == NULL)
3569 abort ();
3570
3571 outrel.r_offset = (htab->elf.sgot->output_section->vma
3572 + htab->elf.sgot->output_offset
3573 + off);
3574 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3575 elf_append_rel (output_bfd, s, &outrel);
3576 }
3577
3578 local_got_offsets[r_symndx] |= 1;
3579 }
3580 }
3581
3582 if (off >= (bfd_vma) -2)
3583 abort ();
3584
3585 relocation = htab->elf.sgot->output_section->vma
3586 + htab->elf.sgot->output_offset + off
3587 - htab->elf.sgotplt->output_section->vma
3588 - htab->elf.sgotplt->output_offset;
3589 break;
3590
3591 case R_386_GOTOFF:
3592 /* Relocation is relative to the start of the global offset
3593 table. */
3594
3595 /* Check to make sure it isn't a protected function symbol
3596 for shared library since it may not be local when used
3597 as function address. We also need to make sure that a
3598 symbol is defined locally. */
3599 if (info->shared && h)
3600 {
3601 if (!h->def_regular)
3602 {
3603 const char *v;
3604
3605 switch (ELF_ST_VISIBILITY (h->other))
3606 {
3607 case STV_HIDDEN:
3608 v = _("hidden symbol");
3609 break;
3610 case STV_INTERNAL:
3611 v = _("internal symbol");
3612 break;
3613 case STV_PROTECTED:
3614 v = _("protected symbol");
3615 break;
3616 default:
3617 v = _("symbol");
3618 break;
3619 }
3620
3621 (*_bfd_error_handler)
3622 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3623 input_bfd, v, h->root.root.string);
3624 bfd_set_error (bfd_error_bad_value);
3625 return FALSE;
3626 }
3627 else if (!info->executable
3628 && !SYMBOLIC_BIND (info, h)
3629 && h->type == STT_FUNC
3630 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3631 {
3632 (*_bfd_error_handler)
3633 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3634 input_bfd, h->root.root.string);
3635 bfd_set_error (bfd_error_bad_value);
3636 return FALSE;
3637 }
3638 }
3639
3640 /* Note that sgot is not involved in this
3641 calculation. We always want the start of .got.plt. If we
3642 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3643 permitted by the ABI, we might have to change this
3644 calculation. */
3645 relocation -= htab->elf.sgotplt->output_section->vma
3646 + htab->elf.sgotplt->output_offset;
3647 break;
3648
3649 case R_386_GOTPC:
3650 /* Use global offset table as symbol value. */
3651 relocation = htab->elf.sgotplt->output_section->vma
3652 + htab->elf.sgotplt->output_offset;
3653 unresolved_reloc = FALSE;
3654 break;
3655
3656 case R_386_PLT32:
3657 /* Relocation is to the entry for this symbol in the
3658 procedure linkage table. */
3659
3660 /* Resolve a PLT32 reloc against a local symbol directly,
3661 without using the procedure linkage table. */
3662 if (h == NULL)
3663 break;
3664
3665 if (h->plt.offset == (bfd_vma) -1
3666 || htab->elf.splt == NULL)
3667 {
3668 /* We didn't make a PLT entry for this symbol. This
3669 happens when statically linking PIC code, or when
3670 using -Bsymbolic. */
3671 break;
3672 }
3673
3674 relocation = (htab->elf.splt->output_section->vma
3675 + htab->elf.splt->output_offset
3676 + h->plt.offset);
3677 unresolved_reloc = FALSE;
3678 break;
3679
3680 case R_386_SIZE32:
3681 /* Set to symbol size. */
3682 relocation = st_size;
3683 /* Fall through. */
3684
3685 case R_386_32:
3686 case R_386_PC32:
3687 if ((input_section->flags & SEC_ALLOC) == 0
3688 || is_vxworks_tls)
3689 break;
3690
3691 if ((info->shared
3692 && (h == NULL
3693 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3694 || h->root.type != bfd_link_hash_undefweak)
3695 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3696 || !SYMBOL_CALLS_LOCAL (info, h)))
3697 || (ELIMINATE_COPY_RELOCS
3698 && !info->shared
3699 && h != NULL
3700 && h->dynindx != -1
3701 && !h->non_got_ref
3702 && ((h->def_dynamic
3703 && !h->def_regular)
3704 || h->root.type == bfd_link_hash_undefweak
3705 || h->root.type == bfd_link_hash_undefined)))
3706 {
3707 Elf_Internal_Rela outrel;
3708 bfd_boolean skip, relocate;
3709 asection *sreloc;
3710
3711 /* When generating a shared object, these relocations
3712 are copied into the output file to be resolved at run
3713 time. */
3714
3715 skip = FALSE;
3716 relocate = FALSE;
3717
3718 outrel.r_offset =
3719 _bfd_elf_section_offset (output_bfd, info, input_section,
3720 rel->r_offset);
3721 if (outrel.r_offset == (bfd_vma) -1)
3722 skip = TRUE;
3723 else if (outrel.r_offset == (bfd_vma) -2)
3724 skip = TRUE, relocate = TRUE;
3725 outrel.r_offset += (input_section->output_section->vma
3726 + input_section->output_offset);
3727
3728 if (skip)
3729 memset (&outrel, 0, sizeof outrel);
3730 else if (h != NULL
3731 && h->dynindx != -1
3732 && (r_type == R_386_PC32
3733 || !info->shared
3734 || !SYMBOLIC_BIND (info, h)
3735 || !h->def_regular))
3736 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3737 else
3738 {
3739 /* This symbol is local, or marked to become local. */
3740 relocate = TRUE;
3741 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3742 }
3743
3744 sreloc = elf_section_data (input_section)->sreloc;
3745
3746 if (sreloc == NULL || sreloc->contents == NULL)
3747 {
3748 r = bfd_reloc_notsupported;
3749 goto check_relocation_error;
3750 }
3751
3752 elf_append_rel (output_bfd, sreloc, &outrel);
3753
3754 /* If this reloc is against an external symbol, we do
3755 not want to fiddle with the addend. Otherwise, we
3756 need to include the symbol value so that it becomes
3757 an addend for the dynamic reloc. */
3758 if (! relocate)
3759 continue;
3760 }
3761 break;
3762
3763 case R_386_TLS_IE:
3764 if (!info->executable)
3765 {
3766 Elf_Internal_Rela outrel;
3767 asection *sreloc;
3768
3769 outrel.r_offset = rel->r_offset
3770 + input_section->output_section->vma
3771 + input_section->output_offset;
3772 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3773 sreloc = elf_section_data (input_section)->sreloc;
3774 if (sreloc == NULL)
3775 abort ();
3776 elf_append_rel (output_bfd, sreloc, &outrel);
3777 }
3778 /* Fall through */
3779
3780 case R_386_TLS_GD:
3781 case R_386_TLS_GOTDESC:
3782 case R_386_TLS_DESC_CALL:
3783 case R_386_TLS_IE_32:
3784 case R_386_TLS_GOTIE:
3785 tls_type = GOT_UNKNOWN;
3786 if (h == NULL && local_got_offsets)
3787 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3788 else if (h != NULL)
3789 tls_type = elf_i386_hash_entry(h)->tls_type;
3790 if (tls_type == GOT_TLS_IE)
3791 tls_type = GOT_TLS_IE_NEG;
3792
3793 if (! elf_i386_tls_transition (info, input_bfd,
3794 input_section, contents,
3795 symtab_hdr, sym_hashes,
3796 &r_type, tls_type, rel,
3797 relend, h, r_symndx))
3798 return FALSE;
3799
3800 if (r_type == R_386_TLS_LE_32)
3801 {
3802 BFD_ASSERT (! unresolved_reloc);
3803 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3804 {
3805 unsigned int type;
3806 bfd_vma roff;
3807
3808 /* GD->LE transition. */
3809 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3810 if (type == 0x04)
3811 {
3812 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3813 Change it into:
3814 movl %gs:0, %eax; subl $foo@tpoff, %eax
3815 (6 byte form of subl). */
3816 memcpy (contents + rel->r_offset - 3,
3817 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3818 roff = rel->r_offset + 5;
3819 }
3820 else
3821 {
3822 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3823 Change it into:
3824 movl %gs:0, %eax; subl $foo@tpoff, %eax
3825 (6 byte form of subl). */
3826 memcpy (contents + rel->r_offset - 2,
3827 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3828 roff = rel->r_offset + 6;
3829 }
3830 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3831 contents + roff);
3832 /* Skip R_386_PC32/R_386_PLT32. */
3833 rel++;
3834 continue;
3835 }
3836 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3837 {
3838 /* GDesc -> LE transition.
3839 It's originally something like:
3840 leal x@tlsdesc(%ebx), %eax
3841
3842 leal x@ntpoff, %eax
3843
3844 Registers other than %eax may be set up here. */
3845
3846 unsigned int val;
3847 bfd_vma roff;
3848
3849 roff = rel->r_offset;
3850 val = bfd_get_8 (input_bfd, contents + roff - 1);
3851
3852 /* Now modify the instruction as appropriate. */
3853 /* aoliva FIXME: remove the above and xor the byte
3854 below with 0x86. */
3855 bfd_put_8 (output_bfd, val ^ 0x86,
3856 contents + roff - 1);
3857 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3858 contents + roff);
3859 continue;
3860 }
3861 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3862 {
3863 /* GDesc -> LE transition.
3864 It's originally:
3865 call *(%eax)
3866 Turn it into:
3867 xchg %ax,%ax */
3868
3869 bfd_vma roff;
3870
3871 roff = rel->r_offset;
3872 bfd_put_8 (output_bfd, 0x66, contents + roff);
3873 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3874 continue;
3875 }
3876 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3877 {
3878 unsigned int val;
3879
3880 /* IE->LE transition:
3881 Originally it can be one of:
3882 movl foo, %eax
3883 movl foo, %reg
3884 addl foo, %reg
3885 We change it into:
3886 movl $foo, %eax
3887 movl $foo, %reg
3888 addl $foo, %reg. */
3889 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3890 if (val == 0xa1)
3891 {
3892 /* movl foo, %eax. */
3893 bfd_put_8 (output_bfd, 0xb8,
3894 contents + rel->r_offset - 1);
3895 }
3896 else
3897 {
3898 unsigned int type;
3899
3900 type = bfd_get_8 (input_bfd,
3901 contents + rel->r_offset - 2);
3902 switch (type)
3903 {
3904 case 0x8b:
3905 /* movl */
3906 bfd_put_8 (output_bfd, 0xc7,
3907 contents + rel->r_offset - 2);
3908 bfd_put_8 (output_bfd,
3909 0xc0 | ((val >> 3) & 7),
3910 contents + rel->r_offset - 1);
3911 break;
3912 case 0x03:
3913 /* addl */
3914 bfd_put_8 (output_bfd, 0x81,
3915 contents + rel->r_offset - 2);
3916 bfd_put_8 (output_bfd,
3917 0xc0 | ((val >> 3) & 7),
3918 contents + rel->r_offset - 1);
3919 break;
3920 default:
3921 BFD_FAIL ();
3922 break;
3923 }
3924 }
3925 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3926 contents + rel->r_offset);
3927 continue;
3928 }
3929 else
3930 {
3931 unsigned int val, type;
3932
3933 /* {IE_32,GOTIE}->LE transition:
3934 Originally it can be one of:
3935 subl foo(%reg1), %reg2
3936 movl foo(%reg1), %reg2
3937 addl foo(%reg1), %reg2
3938 We change it into:
3939 subl $foo, %reg2
3940 movl $foo, %reg2 (6 byte form)
3941 addl $foo, %reg2. */
3942 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3943 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3944 if (type == 0x8b)
3945 {
3946 /* movl */
3947 bfd_put_8 (output_bfd, 0xc7,
3948 contents + rel->r_offset - 2);
3949 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3950 contents + rel->r_offset - 1);
3951 }
3952 else if (type == 0x2b)
3953 {
3954 /* subl */
3955 bfd_put_8 (output_bfd, 0x81,
3956 contents + rel->r_offset - 2);
3957 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3958 contents + rel->r_offset - 1);
3959 }
3960 else if (type == 0x03)
3961 {
3962 /* addl */
3963 bfd_put_8 (output_bfd, 0x81,
3964 contents + rel->r_offset - 2);
3965 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3966 contents + rel->r_offset - 1);
3967 }
3968 else
3969 BFD_FAIL ();
3970 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3971 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3972 contents + rel->r_offset);
3973 else
3974 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3975 contents + rel->r_offset);
3976 continue;
3977 }
3978 }
3979
3980 if (htab->elf.sgot == NULL)
3981 abort ();
3982
3983 if (h != NULL)
3984 {
3985 off = h->got.offset;
3986 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3987 }
3988 else
3989 {
3990 if (local_got_offsets == NULL)
3991 abort ();
3992
3993 off = local_got_offsets[r_symndx];
3994 offplt = local_tlsdesc_gotents[r_symndx];
3995 }
3996
3997 if ((off & 1) != 0)
3998 off &= ~1;
3999 else
4000 {
4001 Elf_Internal_Rela outrel;
4002 int dr_type;
4003 asection *sreloc;
4004
4005 if (htab->elf.srelgot == NULL)
4006 abort ();
4007
4008 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4009
4010 if (GOT_TLS_GDESC_P (tls_type))
4011 {
4012 bfd_byte *loc;
4013 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4014 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4015 <= htab->elf.sgotplt->size);
4016 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4017 + htab->elf.sgotplt->output_offset
4018 + offplt
4019 + htab->sgotplt_jump_table_size);
4020 sreloc = htab->elf.srelplt;
4021 loc = sreloc->contents;
4022 loc += (htab->next_tls_desc_index++
4023 * sizeof (Elf32_External_Rel));
4024 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4025 <= sreloc->contents + sreloc->size);
4026 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4027 if (indx == 0)
4028 {
4029 BFD_ASSERT (! unresolved_reloc);
4030 bfd_put_32 (output_bfd,
4031 relocation - elf_i386_dtpoff_base (info),
4032 htab->elf.sgotplt->contents + offplt
4033 + htab->sgotplt_jump_table_size + 4);
4034 }
4035 else
4036 {
4037 bfd_put_32 (output_bfd, 0,
4038 htab->elf.sgotplt->contents + offplt
4039 + htab->sgotplt_jump_table_size + 4);
4040 }
4041 }
4042
4043 sreloc = htab->elf.srelgot;
4044
4045 outrel.r_offset = (htab->elf.sgot->output_section->vma
4046 + htab->elf.sgot->output_offset + off);
4047
4048 if (GOT_TLS_GD_P (tls_type))
4049 dr_type = R_386_TLS_DTPMOD32;
4050 else if (GOT_TLS_GDESC_P (tls_type))
4051 goto dr_done;
4052 else if (tls_type == GOT_TLS_IE_POS)
4053 dr_type = R_386_TLS_TPOFF;
4054 else
4055 dr_type = R_386_TLS_TPOFF32;
4056
4057 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4058 bfd_put_32 (output_bfd,
4059 relocation - elf_i386_dtpoff_base (info),
4060 htab->elf.sgot->contents + off);
4061 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4062 bfd_put_32 (output_bfd,
4063 elf_i386_dtpoff_base (info) - relocation,
4064 htab->elf.sgot->contents + off);
4065 else if (dr_type != R_386_TLS_DESC)
4066 bfd_put_32 (output_bfd, 0,
4067 htab->elf.sgot->contents + off);
4068 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4069
4070 elf_append_rel (output_bfd, sreloc, &outrel);
4071
4072 if (GOT_TLS_GD_P (tls_type))
4073 {
4074 if (indx == 0)
4075 {
4076 BFD_ASSERT (! unresolved_reloc);
4077 bfd_put_32 (output_bfd,
4078 relocation - elf_i386_dtpoff_base (info),
4079 htab->elf.sgot->contents + off + 4);
4080 }
4081 else
4082 {
4083 bfd_put_32 (output_bfd, 0,
4084 htab->elf.sgot->contents + off + 4);
4085 outrel.r_info = ELF32_R_INFO (indx,
4086 R_386_TLS_DTPOFF32);
4087 outrel.r_offset += 4;
4088 elf_append_rel (output_bfd, sreloc, &outrel);
4089 }
4090 }
4091 else if (tls_type == GOT_TLS_IE_BOTH)
4092 {
4093 bfd_put_32 (output_bfd,
4094 (indx == 0
4095 ? relocation - elf_i386_dtpoff_base (info)
4096 : 0),
4097 htab->elf.sgot->contents + off + 4);
4098 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4099 outrel.r_offset += 4;
4100 elf_append_rel (output_bfd, sreloc, &outrel);
4101 }
4102
4103 dr_done:
4104 if (h != NULL)
4105 h->got.offset |= 1;
4106 else
4107 local_got_offsets[r_symndx] |= 1;
4108 }
4109
4110 if (off >= (bfd_vma) -2
4111 && ! GOT_TLS_GDESC_P (tls_type))
4112 abort ();
4113 if (r_type == R_386_TLS_GOTDESC
4114 || r_type == R_386_TLS_DESC_CALL)
4115 {
4116 relocation = htab->sgotplt_jump_table_size + offplt;
4117 unresolved_reloc = FALSE;
4118 }
4119 else if (r_type == ELF32_R_TYPE (rel->r_info))
4120 {
4121 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4122 + htab->elf.sgotplt->output_offset;
4123 relocation = htab->elf.sgot->output_section->vma
4124 + htab->elf.sgot->output_offset + off - g_o_t;
4125 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4126 && tls_type == GOT_TLS_IE_BOTH)
4127 relocation += 4;
4128 if (r_type == R_386_TLS_IE)
4129 relocation += g_o_t;
4130 unresolved_reloc = FALSE;
4131 }
4132 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4133 {
4134 unsigned int val, type;
4135 bfd_vma roff;
4136
4137 /* GD->IE transition. */
4138 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4139 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4140 if (type == 0x04)
4141 {
4142 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4143 Change it into:
4144 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4145 val >>= 3;
4146 roff = rel->r_offset - 3;
4147 }
4148 else
4149 {
4150 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4151 Change it into:
4152 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4153 roff = rel->r_offset - 2;
4154 }
4155 memcpy (contents + roff,
4156 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4157 contents[roff + 7] = 0x80 | (val & 7);
4158 /* If foo is used only with foo@gotntpoff(%reg) and
4159 foo@indntpoff, but not with foo@gottpoff(%reg), change
4160 subl $foo@gottpoff(%reg), %eax
4161 into:
4162 addl $foo@gotntpoff(%reg), %eax. */
4163 if (tls_type == GOT_TLS_IE_POS)
4164 contents[roff + 6] = 0x03;
4165 bfd_put_32 (output_bfd,
4166 htab->elf.sgot->output_section->vma
4167 + htab->elf.sgot->output_offset + off
4168 - htab->elf.sgotplt->output_section->vma
4169 - htab->elf.sgotplt->output_offset,
4170 contents + roff + 8);
4171 /* Skip R_386_PLT32. */
4172 rel++;
4173 continue;
4174 }
4175 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4176 {
4177 /* GDesc -> IE transition.
4178 It's originally something like:
4179 leal x@tlsdesc(%ebx), %eax
4180
4181 Change it to:
4182 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4183 or:
4184 movl x@gottpoff(%ebx), %eax # before negl %eax
4185
4186 Registers other than %eax may be set up here. */
4187
4188 bfd_vma roff;
4189
4190 /* First, make sure it's a leal adding ebx to a 32-bit
4191 offset into any register, although it's probably
4192 almost always going to be eax. */
4193 roff = rel->r_offset;
4194
4195 /* Now modify the instruction as appropriate. */
4196 /* To turn a leal into a movl in the form we use it, it
4197 suffices to change the first byte from 0x8d to 0x8b.
4198 aoliva FIXME: should we decide to keep the leal, all
4199 we have to do is remove the statement below, and
4200 adjust the relaxation of R_386_TLS_DESC_CALL. */
4201 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4202
4203 if (tls_type == GOT_TLS_IE_BOTH)
4204 off += 4;
4205
4206 bfd_put_32 (output_bfd,
4207 htab->elf.sgot->output_section->vma
4208 + htab->elf.sgot->output_offset + off
4209 - htab->elf.sgotplt->output_section->vma
4210 - htab->elf.sgotplt->output_offset,
4211 contents + roff);
4212 continue;
4213 }
4214 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4215 {
4216 /* GDesc -> IE transition.
4217 It's originally:
4218 call *(%eax)
4219
4220 Change it to:
4221 xchg %ax,%ax
4222 or
4223 negl %eax
4224 depending on how we transformed the TLS_GOTDESC above.
4225 */
4226
4227 bfd_vma roff;
4228
4229 roff = rel->r_offset;
4230
4231 /* Now modify the instruction as appropriate. */
4232 if (tls_type != GOT_TLS_IE_NEG)
4233 {
4234 /* xchg %ax,%ax */
4235 bfd_put_8 (output_bfd, 0x66, contents + roff);
4236 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4237 }
4238 else
4239 {
4240 /* negl %eax */
4241 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4242 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4243 }
4244
4245 continue;
4246 }
4247 else
4248 BFD_ASSERT (FALSE);
4249 break;
4250
4251 case R_386_TLS_LDM:
4252 if (! elf_i386_tls_transition (info, input_bfd,
4253 input_section, contents,
4254 symtab_hdr, sym_hashes,
4255 &r_type, GOT_UNKNOWN, rel,
4256 relend, h, r_symndx))
4257 return FALSE;
4258
4259 if (r_type != R_386_TLS_LDM)
4260 {
4261 /* LD->LE transition:
4262 leal foo(%reg), %eax; call ___tls_get_addr.
4263 We change it into:
4264 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4265 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4266 memcpy (contents + rel->r_offset - 2,
4267 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4268 /* Skip R_386_PC32/R_386_PLT32. */
4269 rel++;
4270 continue;
4271 }
4272
4273 if (htab->elf.sgot == NULL)
4274 abort ();
4275
4276 off = htab->tls_ldm_got.offset;
4277 if (off & 1)
4278 off &= ~1;
4279 else
4280 {
4281 Elf_Internal_Rela outrel;
4282
4283 if (htab->elf.srelgot == NULL)
4284 abort ();
4285
4286 outrel.r_offset = (htab->elf.sgot->output_section->vma
4287 + htab->elf.sgot->output_offset + off);
4288
4289 bfd_put_32 (output_bfd, 0,
4290 htab->elf.sgot->contents + off);
4291 bfd_put_32 (output_bfd, 0,
4292 htab->elf.sgot->contents + off + 4);
4293 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4294 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4295 htab->tls_ldm_got.offset |= 1;
4296 }
4297 relocation = htab->elf.sgot->output_section->vma
4298 + htab->elf.sgot->output_offset + off
4299 - htab->elf.sgotplt->output_section->vma
4300 - htab->elf.sgotplt->output_offset;
4301 unresolved_reloc = FALSE;
4302 break;
4303
4304 case R_386_TLS_LDO_32:
4305 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4306 relocation -= elf_i386_dtpoff_base (info);
4307 else
4308 /* When converting LDO to LE, we must negate. */
4309 relocation = -elf_i386_tpoff (info, relocation);
4310 break;
4311
4312 case R_386_TLS_LE_32:
4313 case R_386_TLS_LE:
4314 if (!info->executable)
4315 {
4316 Elf_Internal_Rela outrel;
4317 asection *sreloc;
4318
4319 outrel.r_offset = rel->r_offset
4320 + input_section->output_section->vma
4321 + input_section->output_offset;
4322 if (h != NULL && h->dynindx != -1)
4323 indx = h->dynindx;
4324 else
4325 indx = 0;
4326 if (r_type == R_386_TLS_LE_32)
4327 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4328 else
4329 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4330 sreloc = elf_section_data (input_section)->sreloc;
4331 if (sreloc == NULL)
4332 abort ();
4333 elf_append_rel (output_bfd, sreloc, &outrel);
4334 if (indx)
4335 continue;
4336 else if (r_type == R_386_TLS_LE_32)
4337 relocation = elf_i386_dtpoff_base (info) - relocation;
4338 else
4339 relocation -= elf_i386_dtpoff_base (info);
4340 }
4341 else if (r_type == R_386_TLS_LE_32)
4342 relocation = elf_i386_tpoff (info, relocation);
4343 else
4344 relocation = -elf_i386_tpoff (info, relocation);
4345 break;
4346
4347 default:
4348 break;
4349 }
4350
4351 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4352 because such sections are not SEC_ALLOC and thus ld.so will
4353 not process them. */
4354 if (unresolved_reloc
4355 && !((input_section->flags & SEC_DEBUGGING) != 0
4356 && h->def_dynamic)
4357 && _bfd_elf_section_offset (output_bfd, info, input_section,
4358 rel->r_offset) != (bfd_vma) -1)
4359 {
4360 (*_bfd_error_handler)
4361 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4362 input_bfd,
4363 input_section,
4364 (long) rel->r_offset,
4365 howto->name,
4366 h->root.root.string);
4367 return FALSE;
4368 }
4369
4370 do_relocation:
4371 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4372 contents, rel->r_offset,
4373 relocation, 0);
4374
4375 check_relocation_error:
4376 if (r != bfd_reloc_ok)
4377 {
4378 const char *name;
4379
4380 if (h != NULL)
4381 name = h->root.root.string;
4382 else
4383 {
4384 name = bfd_elf_string_from_elf_section (input_bfd,
4385 symtab_hdr->sh_link,
4386 sym->st_name);
4387 if (name == NULL)
4388 return FALSE;
4389 if (*name == '\0')
4390 name = bfd_section_name (input_bfd, sec);
4391 }
4392
4393 if (r == bfd_reloc_overflow)
4394 {
4395 if (! ((*info->callbacks->reloc_overflow)
4396 (info, (h ? &h->root : NULL), name, howto->name,
4397 (bfd_vma) 0, input_bfd, input_section,
4398 rel->r_offset)))
4399 return FALSE;
4400 }
4401 else
4402 {
4403 (*_bfd_error_handler)
4404 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4405 input_bfd, input_section,
4406 (long) rel->r_offset, name, (int) r);
4407 return FALSE;
4408 }
4409 }
4410 }
4411
4412 return TRUE;
4413 }
4414
4415 /* Finish up dynamic symbol handling. We set the contents of various
4416 dynamic sections here. */
4417
4418 static bfd_boolean
4419 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4420 struct bfd_link_info *info,
4421 struct elf_link_hash_entry *h,
4422 Elf_Internal_Sym *sym)
4423 {
4424 struct elf_i386_link_hash_table *htab;
4425 unsigned plt_entry_size;
4426 const struct elf_i386_backend_data *abed;
4427
4428 htab = elf_i386_hash_table (info);
4429 if (htab == NULL)
4430 return FALSE;
4431
4432 abed = get_elf_i386_backend_data (output_bfd);
4433 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4434
4435 if (h->plt.offset != (bfd_vma) -1)
4436 {
4437 bfd_vma plt_index;
4438 bfd_vma got_offset;
4439 Elf_Internal_Rela rel;
4440 bfd_byte *loc;
4441 asection *plt, *gotplt, *relplt;
4442
4443 /* When building a static executable, use .iplt, .igot.plt and
4444 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4445 if (htab->elf.splt != NULL)
4446 {
4447 plt = htab->elf.splt;
4448 gotplt = htab->elf.sgotplt;
4449 relplt = htab->elf.srelplt;
4450 }
4451 else
4452 {
4453 plt = htab->elf.iplt;
4454 gotplt = htab->elf.igotplt;
4455 relplt = htab->elf.irelplt;
4456 }
4457
4458 /* This symbol has an entry in the procedure linkage table. Set
4459 it up. */
4460
4461 if ((h->dynindx == -1
4462 && !((h->forced_local || info->executable)
4463 && h->def_regular
4464 && h->type == STT_GNU_IFUNC))
4465 || plt == NULL
4466 || gotplt == NULL
4467 || relplt == NULL)
4468 abort ();
4469
4470 /* Get the index in the procedure linkage table which
4471 corresponds to this symbol. This is the index of this symbol
4472 in all the symbols for which we are making plt entries. The
4473 first entry in the procedure linkage table is reserved.
4474
4475 Get the offset into the .got table of the entry that
4476 corresponds to this function. Each .got entry is 4 bytes.
4477 The first three are reserved.
4478
4479 For static executables, we don't reserve anything. */
4480
4481 if (plt == htab->elf.splt)
4482 {
4483 got_offset = h->plt.offset / plt_entry_size - 1;
4484 got_offset = (got_offset + 3) * 4;
4485 }
4486 else
4487 {
4488 got_offset = h->plt.offset / plt_entry_size;
4489 got_offset = got_offset * 4;
4490 }
4491
4492 /* Fill in the entry in the procedure linkage table. */
4493 if (! info->shared)
4494 {
4495 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4496 abed->plt->plt_entry_size);
4497 bfd_put_32 (output_bfd,
4498 (gotplt->output_section->vma
4499 + gotplt->output_offset
4500 + got_offset),
4501 plt->contents + h->plt.offset
4502 + abed->plt->plt_got_offset);
4503
4504 if (abed->is_vxworks)
4505 {
4506 int s, k, reloc_index;
4507
4508 /* Create the R_386_32 relocation referencing the GOT
4509 for this PLT entry. */
4510
4511 /* S: Current slot number (zero-based). */
4512 s = ((h->plt.offset - abed->plt->plt_entry_size)
4513 / abed->plt->plt_entry_size);
4514 /* K: Number of relocations for PLTResolve. */
4515 if (info->shared)
4516 k = PLTRESOLVE_RELOCS_SHLIB;
4517 else
4518 k = PLTRESOLVE_RELOCS;
4519 /* Skip the PLTresolve relocations, and the relocations for
4520 the other PLT slots. */
4521 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4522 loc = (htab->srelplt2->contents + reloc_index
4523 * sizeof (Elf32_External_Rel));
4524
4525 rel.r_offset = (htab->elf.splt->output_section->vma
4526 + htab->elf.splt->output_offset
4527 + h->plt.offset + 2),
4528 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4529 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4530
4531 /* Create the R_386_32 relocation referencing the beginning of
4532 the PLT for this GOT entry. */
4533 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4534 + htab->elf.sgotplt->output_offset
4535 + got_offset);
4536 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4537 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4538 loc + sizeof (Elf32_External_Rel));
4539 }
4540 }
4541 else
4542 {
4543 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4544 abed->plt->plt_entry_size);
4545 bfd_put_32 (output_bfd, got_offset,
4546 plt->contents + h->plt.offset
4547 + abed->plt->plt_got_offset);
4548 }
4549
4550 /* Fill in the entry in the global offset table. */
4551 bfd_put_32 (output_bfd,
4552 (plt->output_section->vma
4553 + plt->output_offset
4554 + h->plt.offset
4555 + abed->plt->plt_lazy_offset),
4556 gotplt->contents + got_offset);
4557
4558 /* Fill in the entry in the .rel.plt section. */
4559 rel.r_offset = (gotplt->output_section->vma
4560 + gotplt->output_offset
4561 + got_offset);
4562 if (h->dynindx == -1
4563 || ((info->executable
4564 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4565 && h->def_regular
4566 && h->type == STT_GNU_IFUNC))
4567 {
4568 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4569 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4570 in the .got.plt section. */
4571 bfd_put_32 (output_bfd,
4572 (h->root.u.def.value
4573 + h->root.u.def.section->output_section->vma
4574 + h->root.u.def.section->output_offset),
4575 gotplt->contents + got_offset);
4576 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4577 /* R_386_IRELATIVE comes last. */
4578 plt_index = htab->next_irelative_index--;
4579 }
4580 else
4581 {
4582 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4583 plt_index = htab->next_jump_slot_index++;
4584 }
4585 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4586 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4587
4588 /* Don't fill PLT entry for static executables. */
4589 if (plt == htab->elf.splt)
4590 {
4591 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4592 plt->contents + h->plt.offset
4593 + abed->plt->plt_reloc_offset);
4594 bfd_put_32 (output_bfd, - (h->plt.offset
4595 + abed->plt->plt_plt_offset + 4),
4596 plt->contents + h->plt.offset
4597 + abed->plt->plt_plt_offset);
4598 }
4599
4600 if (!h->def_regular)
4601 {
4602 /* Mark the symbol as undefined, rather than as defined in
4603 the .plt section. Leave the value if there were any
4604 relocations where pointer equality matters (this is a clue
4605 for the dynamic linker, to make function pointer
4606 comparisons work between an application and shared
4607 library), otherwise set it to zero. If a function is only
4608 called from a binary, there is no need to slow down
4609 shared libraries because of that. */
4610 sym->st_shndx = SHN_UNDEF;
4611 if (!h->pointer_equality_needed)
4612 sym->st_value = 0;
4613 }
4614 }
4615
4616 if (h->got.offset != (bfd_vma) -1
4617 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4618 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4619 {
4620 Elf_Internal_Rela rel;
4621
4622 /* This symbol has an entry in the global offset table. Set it
4623 up. */
4624
4625 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4626 abort ();
4627
4628 rel.r_offset = (htab->elf.sgot->output_section->vma
4629 + htab->elf.sgot->output_offset
4630 + (h->got.offset & ~(bfd_vma) 1));
4631
4632 /* If this is a static link, or it is a -Bsymbolic link and the
4633 symbol is defined locally or was forced to be local because
4634 of a version file, we just want to emit a RELATIVE reloc.
4635 The entry in the global offset table will already have been
4636 initialized in the relocate_section function. */
4637 if (h->def_regular
4638 && h->type == STT_GNU_IFUNC)
4639 {
4640 if (info->shared)
4641 {
4642 /* Generate R_386_GLOB_DAT. */
4643 goto do_glob_dat;
4644 }
4645 else
4646 {
4647 asection *plt;
4648
4649 if (!h->pointer_equality_needed)
4650 abort ();
4651
4652 /* For non-shared object, we can't use .got.plt, which
4653 contains the real function addres if we need pointer
4654 equality. We load the GOT entry with the PLT entry. */
4655 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4656 bfd_put_32 (output_bfd,
4657 (plt->output_section->vma
4658 + plt->output_offset + h->plt.offset),
4659 htab->elf.sgot->contents + h->got.offset);
4660 return TRUE;
4661 }
4662 }
4663 else if (info->shared
4664 && SYMBOL_REFERENCES_LOCAL (info, h))
4665 {
4666 BFD_ASSERT((h->got.offset & 1) != 0);
4667 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4668 }
4669 else
4670 {
4671 BFD_ASSERT((h->got.offset & 1) == 0);
4672 do_glob_dat:
4673 bfd_put_32 (output_bfd, (bfd_vma) 0,
4674 htab->elf.sgot->contents + h->got.offset);
4675 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4676 }
4677
4678 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4679 }
4680
4681 if (h->needs_copy)
4682 {
4683 Elf_Internal_Rela rel;
4684
4685 /* This symbol needs a copy reloc. Set it up. */
4686
4687 if (h->dynindx == -1
4688 || (h->root.type != bfd_link_hash_defined
4689 && h->root.type != bfd_link_hash_defweak)
4690 || htab->srelbss == NULL)
4691 abort ();
4692
4693 rel.r_offset = (h->root.u.def.value
4694 + h->root.u.def.section->output_section->vma
4695 + h->root.u.def.section->output_offset);
4696 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4697 elf_append_rel (output_bfd, htab->srelbss, &rel);
4698 }
4699
4700 return TRUE;
4701 }
4702
4703 /* Finish up local dynamic symbol handling. We set the contents of
4704 various dynamic sections here. */
4705
4706 static bfd_boolean
4707 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4708 {
4709 struct elf_link_hash_entry *h
4710 = (struct elf_link_hash_entry *) *slot;
4711 struct bfd_link_info *info
4712 = (struct bfd_link_info *) inf;
4713
4714 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4715 h, NULL);
4716 }
4717
4718 /* Used to decide how to sort relocs in an optimal manner for the
4719 dynamic linker, before writing them out. */
4720
4721 static enum elf_reloc_type_class
4722 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4723 const asection *rel_sec ATTRIBUTE_UNUSED,
4724 const Elf_Internal_Rela *rela)
4725 {
4726 switch (ELF32_R_TYPE (rela->r_info))
4727 {
4728 case R_386_RELATIVE:
4729 return reloc_class_relative;
4730 case R_386_JUMP_SLOT:
4731 return reloc_class_plt;
4732 case R_386_COPY:
4733 return reloc_class_copy;
4734 default:
4735 return reloc_class_normal;
4736 }
4737 }
4738
4739 /* Finish up the dynamic sections. */
4740
4741 static bfd_boolean
4742 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4743 struct bfd_link_info *info)
4744 {
4745 struct elf_i386_link_hash_table *htab;
4746 bfd *dynobj;
4747 asection *sdyn;
4748 const struct elf_i386_backend_data *abed;
4749
4750 htab = elf_i386_hash_table (info);
4751 if (htab == NULL)
4752 return FALSE;
4753
4754 dynobj = htab->elf.dynobj;
4755 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4756 abed = get_elf_i386_backend_data (output_bfd);
4757
4758 if (htab->elf.dynamic_sections_created)
4759 {
4760 Elf32_External_Dyn *dyncon, *dynconend;
4761
4762 if (sdyn == NULL || htab->elf.sgot == NULL)
4763 abort ();
4764
4765 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4766 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4767 for (; dyncon < dynconend; dyncon++)
4768 {
4769 Elf_Internal_Dyn dyn;
4770 asection *s;
4771
4772 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4773
4774 switch (dyn.d_tag)
4775 {
4776 default:
4777 if (abed->is_vxworks
4778 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4779 break;
4780 continue;
4781
4782 case DT_PLTGOT:
4783 s = htab->elf.sgotplt;
4784 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4785 break;
4786
4787 case DT_JMPREL:
4788 s = htab->elf.srelplt;
4789 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4790 break;
4791
4792 case DT_PLTRELSZ:
4793 s = htab->elf.srelplt;
4794 dyn.d_un.d_val = s->size;
4795 break;
4796
4797 case DT_RELSZ:
4798 /* My reading of the SVR4 ABI indicates that the
4799 procedure linkage table relocs (DT_JMPREL) should be
4800 included in the overall relocs (DT_REL). This is
4801 what Solaris does. However, UnixWare can not handle
4802 that case. Therefore, we override the DT_RELSZ entry
4803 here to make it not include the JMPREL relocs. */
4804 s = htab->elf.srelplt;
4805 if (s == NULL)
4806 continue;
4807 dyn.d_un.d_val -= s->size;
4808 break;
4809
4810 case DT_REL:
4811 /* We may not be using the standard ELF linker script.
4812 If .rel.plt is the first .rel section, we adjust
4813 DT_REL to not include it. */
4814 s = htab->elf.srelplt;
4815 if (s == NULL)
4816 continue;
4817 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4818 continue;
4819 dyn.d_un.d_ptr += s->size;
4820 break;
4821 }
4822
4823 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4824 }
4825
4826 /* Fill in the first entry in the procedure linkage table. */
4827 if (htab->elf.splt && htab->elf.splt->size > 0)
4828 {
4829 if (info->shared)
4830 {
4831 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4832 abed->plt->plt0_entry_size);
4833 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4834 abed->plt0_pad_byte,
4835 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4836 }
4837 else
4838 {
4839 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4840 abed->plt->plt0_entry_size);
4841 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4842 abed->plt0_pad_byte,
4843 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4844 bfd_put_32 (output_bfd,
4845 (htab->elf.sgotplt->output_section->vma
4846 + htab->elf.sgotplt->output_offset
4847 + 4),
4848 htab->elf.splt->contents
4849 + abed->plt->plt0_got1_offset);
4850 bfd_put_32 (output_bfd,
4851 (htab->elf.sgotplt->output_section->vma
4852 + htab->elf.sgotplt->output_offset
4853 + 8),
4854 htab->elf.splt->contents
4855 + abed->plt->plt0_got2_offset);
4856
4857 if (abed->is_vxworks)
4858 {
4859 Elf_Internal_Rela rel;
4860
4861 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4862 On IA32 we use REL relocations so the addend goes in
4863 the PLT directly. */
4864 rel.r_offset = (htab->elf.splt->output_section->vma
4865 + htab->elf.splt->output_offset
4866 + abed->plt->plt0_got1_offset);
4867 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4868 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4869 htab->srelplt2->contents);
4870 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4871 rel.r_offset = (htab->elf.splt->output_section->vma
4872 + htab->elf.splt->output_offset
4873 + abed->plt->plt0_got2_offset);
4874 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4875 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4876 htab->srelplt2->contents +
4877 sizeof (Elf32_External_Rel));
4878 }
4879 }
4880
4881 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4882 really seem like the right value. */
4883 elf_section_data (htab->elf.splt->output_section)
4884 ->this_hdr.sh_entsize = 4;
4885
4886 /* Correct the .rel.plt.unloaded relocations. */
4887 if (abed->is_vxworks && !info->shared)
4888 {
4889 int num_plts = (htab->elf.splt->size
4890 / abed->plt->plt_entry_size) - 1;
4891 unsigned char *p;
4892
4893 p = htab->srelplt2->contents;
4894 if (info->shared)
4895 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4896 else
4897 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4898
4899 for (; num_plts; num_plts--)
4900 {
4901 Elf_Internal_Rela rel;
4902 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4903 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4904 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4905 p += sizeof (Elf32_External_Rel);
4906
4907 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4908 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4909 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4910 p += sizeof (Elf32_External_Rel);
4911 }
4912 }
4913 }
4914 }
4915
4916 if (htab->elf.sgotplt)
4917 {
4918 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4919 {
4920 (*_bfd_error_handler)
4921 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4922 return FALSE;
4923 }
4924
4925 /* Fill in the first three entries in the global offset table. */
4926 if (htab->elf.sgotplt->size > 0)
4927 {
4928 bfd_put_32 (output_bfd,
4929 (sdyn == NULL ? 0
4930 : sdyn->output_section->vma + sdyn->output_offset),
4931 htab->elf.sgotplt->contents);
4932 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4933 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4934 }
4935
4936 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4937 }
4938
4939 /* Adjust .eh_frame for .plt section. */
4940 if (htab->plt_eh_frame != NULL
4941 && htab->plt_eh_frame->contents != NULL)
4942 {
4943 if (htab->elf.splt != NULL
4944 && htab->elf.splt->size != 0
4945 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4946 && htab->elf.splt->output_section != NULL
4947 && htab->plt_eh_frame->output_section != NULL)
4948 {
4949 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4950 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4951 + htab->plt_eh_frame->output_offset
4952 + PLT_FDE_START_OFFSET;
4953 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4954 htab->plt_eh_frame->contents
4955 + PLT_FDE_START_OFFSET);
4956 }
4957 if (htab->plt_eh_frame->sec_info_type
4958 == SEC_INFO_TYPE_EH_FRAME)
4959 {
4960 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4961 htab->plt_eh_frame,
4962 htab->plt_eh_frame->contents))
4963 return FALSE;
4964 }
4965 }
4966
4967 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4968 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4969
4970 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4971 htab_traverse (htab->loc_hash_table,
4972 elf_i386_finish_local_dynamic_symbol,
4973 info);
4974
4975 return TRUE;
4976 }
4977
4978 /* Return address for Ith PLT stub in section PLT, for relocation REL
4979 or (bfd_vma) -1 if it should not be included. */
4980
4981 static bfd_vma
4982 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4983 const arelent *rel ATTRIBUTE_UNUSED)
4984 {
4985 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4986 }
4987
4988 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4989
4990 static bfd_boolean
4991 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4992 {
4993 if (h->plt.offset != (bfd_vma) -1
4994 && !h->def_regular
4995 && !h->pointer_equality_needed)
4996 return FALSE;
4997
4998 return _bfd_elf_hash_symbol (h);
4999 }
5000
5001 /* Hook called by the linker routine which adds symbols from an object
5002 file. */
5003
5004 static bfd_boolean
5005 elf_i386_add_symbol_hook (bfd * abfd,
5006 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5007 Elf_Internal_Sym * sym,
5008 const char ** namep ATTRIBUTE_UNUSED,
5009 flagword * flagsp ATTRIBUTE_UNUSED,
5010 asection ** secp ATTRIBUTE_UNUSED,
5011 bfd_vma * valp ATTRIBUTE_UNUSED)
5012 {
5013 if ((abfd->flags & DYNAMIC) == 0
5014 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5015 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5016 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5017
5018 return TRUE;
5019 }
5020
5021 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5022 #define TARGET_LITTLE_NAME "elf32-i386"
5023 #define ELF_ARCH bfd_arch_i386
5024 #define ELF_TARGET_ID I386_ELF_DATA
5025 #define ELF_MACHINE_CODE EM_386
5026 #define ELF_MAXPAGESIZE 0x1000
5027
5028 #define elf_backend_can_gc_sections 1
5029 #define elf_backend_can_refcount 1
5030 #define elf_backend_want_got_plt 1
5031 #define elf_backend_plt_readonly 1
5032 #define elf_backend_want_plt_sym 0
5033 #define elf_backend_got_header_size 12
5034 #define elf_backend_plt_alignment 4
5035
5036 /* Support RELA for objdump of prelink objects. */
5037 #define elf_info_to_howto elf_i386_info_to_howto_rel
5038 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5039
5040 #define bfd_elf32_mkobject elf_i386_mkobject
5041
5042 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5043 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5044 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5045 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5046 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5047
5048 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5049 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5050 #define elf_backend_check_relocs elf_i386_check_relocs
5051 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5052 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5053 #define elf_backend_fake_sections elf_i386_fake_sections
5054 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5055 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5056 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5057 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5058 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5059 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5060 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5061 #define elf_backend_relocate_section elf_i386_relocate_section
5062 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5063 #define elf_backend_always_size_sections elf_i386_always_size_sections
5064 #define elf_backend_omit_section_dynsym \
5065 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5066 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5067 #define elf_backend_hash_symbol elf_i386_hash_symbol
5068 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5069 #undef elf_backend_post_process_headers
5070 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5071
5072 #include "elf32-target.h"
5073
5074 /* FreeBSD support. */
5075
5076 #undef TARGET_LITTLE_SYM
5077 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5078 #undef TARGET_LITTLE_NAME
5079 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5080 #undef ELF_OSABI
5081 #define ELF_OSABI ELFOSABI_FREEBSD
5082
5083 /* The kernel recognizes executables as valid only if they carry a
5084 "FreeBSD" label in the ELF header. So we put this label on all
5085 executables and (for simplicity) also all other object files. */
5086
5087 static void
5088 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5089 {
5090 _bfd_elf_set_osabi (abfd, info);
5091
5092 #ifdef OLD_FREEBSD_ABI_LABEL
5093 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5094 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5095 #endif
5096 }
5097
5098 #undef elf_backend_post_process_headers
5099 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5100 #undef elf32_bed
5101 #define elf32_bed elf32_i386_fbsd_bed
5102
5103 #undef elf_backend_add_symbol_hook
5104
5105 #include "elf32-target.h"
5106
5107 /* Solaris 2. */
5108
5109 #undef TARGET_LITTLE_SYM
5110 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5111 #undef TARGET_LITTLE_NAME
5112 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5113
5114 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5115 objects won't be recognized. */
5116 #undef ELF_OSABI
5117
5118 #undef elf32_bed
5119 #define elf32_bed elf32_i386_sol2_bed
5120
5121 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5122 boundary. */
5123 #undef elf_backend_static_tls_alignment
5124 #define elf_backend_static_tls_alignment 8
5125
5126 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5127
5128 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5129 File, p.63. */
5130 #undef elf_backend_want_plt_sym
5131 #define elf_backend_want_plt_sym 1
5132
5133 #include "elf32-target.h"
5134
5135 /* Native Client support. */
5136
5137 #undef TARGET_LITTLE_SYM
5138 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5139 #undef TARGET_LITTLE_NAME
5140 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5141 #undef elf32_bed
5142 #define elf32_bed elf32_i386_nacl_bed
5143
5144 #undef ELF_MAXPAGESIZE
5145 #define ELF_MAXPAGESIZE 0x10000
5146
5147 /* Restore defaults. */
5148 #undef ELF_OSABI
5149 #undef elf_backend_want_plt_sym
5150 #define elf_backend_want_plt_sym 0
5151 #undef elf_backend_post_process_headers
5152 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5153 #undef elf_backend_static_tls_alignment
5154
5155 /* NaCl uses substantially different PLT entries for the same effects. */
5156
5157 #undef elf_backend_plt_alignment
5158 #define elf_backend_plt_alignment 5
5159 #define NACL_PLT_ENTRY_SIZE 64
5160 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5161
5162 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5163 {
5164 0xff, 0x35, /* pushl contents of address */
5165 0, 0, 0, 0, /* replaced with address of .got + 4. */
5166 0x8b, 0x0d, /* movl contents of address, %ecx */
5167 0, 0, 0, 0, /* replaced with address of .got + 8. */
5168 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5169 0xff, 0xe1 /* jmp *%ecx */
5170 };
5171
5172 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5173 {
5174 0x8b, 0x0d, /* movl contents of address, %ecx */
5175 0, 0, 0, 0, /* replaced with GOT slot address. */
5176 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5177 0xff, 0xe1, /* jmp *%ecx */
5178
5179 /* Pad to the next 32-byte boundary with nop instructions. */
5180 0x90,
5181 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5182 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5183
5184 /* Lazy GOT entries point here (32-byte aligned). */
5185 0x68, /* pushl immediate */
5186 0, 0, 0, 0, /* replaced with reloc offset. */
5187 0xe9, /* jmp relative */
5188 0, 0, 0, 0, /* replaced with offset to .plt. */
5189
5190 /* Pad to the next 32-byte boundary with nop instructions. */
5191 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5192 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5193 0x90, 0x90
5194 };
5195
5196 static const bfd_byte
5197 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5198 {
5199 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5200 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5201 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5202 0xff, 0xe1, /* jmp *%ecx */
5203
5204 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5205 so pad to that size with nop instructions. */
5206 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5207 };
5208
5209 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5210 {
5211 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5212 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5213 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5214 0xff, 0xe1, /* jmp *%ecx */
5215
5216 /* Pad to the next 32-byte boundary with nop instructions. */
5217 0x90,
5218 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5219 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5220
5221 /* Lazy GOT entries point here (32-byte aligned). */
5222 0x68, /* pushl immediate */
5223 0, 0, 0, 0, /* replaced with offset into relocation table. */
5224 0xe9, /* jmp relative */
5225 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5226
5227 /* Pad to the next 32-byte boundary with nop instructions. */
5228 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5229 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5230 0x90, 0x90
5231 };
5232
5233 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5234 {
5235 #if (PLT_CIE_LENGTH != 20 \
5236 || PLT_FDE_LENGTH != 36 \
5237 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5238 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5239 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5240 #endif
5241 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5242 0, 0, 0, 0, /* CIE ID */
5243 1, /* CIE version */
5244 'z', 'R', 0, /* Augmentation string */
5245 1, /* Code alignment factor */
5246 0x7c, /* Data alignment factor: -4 */
5247 8, /* Return address column */
5248 1, /* Augmentation size */
5249 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5250 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5251 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5252 DW_CFA_nop, DW_CFA_nop,
5253
5254 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5255 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5256 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5257 0, 0, 0, 0, /* .plt size goes here */
5258 0, /* Augmentation size */
5259 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5260 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5261 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5262 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5263 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5264 13, /* Block length */
5265 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5266 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5267 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5268 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5269 DW_CFA_nop, DW_CFA_nop
5270 };
5271
5272 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5273 {
5274 elf_i386_nacl_plt0_entry, /* plt0_entry */
5275 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5276 2, /* plt0_got1_offset */
5277 8, /* plt0_got2_offset */
5278 elf_i386_nacl_plt_entry, /* plt_entry */
5279 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5280 2, /* plt_got_offset */
5281 33, /* plt_reloc_offset */
5282 38, /* plt_plt_offset */
5283 32, /* plt_lazy_offset */
5284 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5285 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5286 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5287 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5288 };
5289
5290 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5291 {
5292 &elf_i386_nacl_plt, /* plt */
5293 0x90, /* plt0_pad_byte: nop insn */
5294 0, /* is_vxworks */
5295 };
5296
5297 #undef elf_backend_arch_data
5298 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5299
5300 #undef elf_backend_modify_segment_map
5301 #define elf_backend_modify_segment_map nacl_modify_segment_map
5302 #undef elf_backend_modify_program_headers
5303 #define elf_backend_modify_program_headers nacl_modify_program_headers
5304
5305 #include "elf32-target.h"
5306
5307 /* Restore defaults. */
5308 #undef elf_backend_modify_segment_map
5309 #undef elf_backend_modify_program_headers
5310
5311 /* VxWorks support. */
5312
5313 #undef TARGET_LITTLE_SYM
5314 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5315 #undef TARGET_LITTLE_NAME
5316 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5317 #undef ELF_OSABI
5318 #undef elf_backend_plt_alignment
5319 #define elf_backend_plt_alignment 4
5320
5321 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5322 {
5323 &elf_i386_plt, /* plt */
5324 0x90, /* plt0_pad_byte */
5325 1, /* is_vxworks */
5326 };
5327
5328 #undef elf_backend_arch_data
5329 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5330
5331 #undef elf_backend_relocs_compatible
5332 #undef elf_backend_post_process_headers
5333 #undef elf_backend_add_symbol_hook
5334 #define elf_backend_add_symbol_hook \
5335 elf_vxworks_add_symbol_hook
5336 #undef elf_backend_link_output_symbol_hook
5337 #define elf_backend_link_output_symbol_hook \
5338 elf_vxworks_link_output_symbol_hook
5339 #undef elf_backend_emit_relocs
5340 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5341 #undef elf_backend_final_write_processing
5342 #define elf_backend_final_write_processing \
5343 elf_vxworks_final_write_processing
5344 #undef elf_backend_static_tls_alignment
5345
5346 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5347 define it. */
5348 #undef elf_backend_want_plt_sym
5349 #define elf_backend_want_plt_sym 1
5350
5351 #undef elf32_bed
5352 #define elf32_bed elf32_i386_vxworks_bed
5353
5354 #include "elf32-target.h"
GDB Binutils - Deliverables
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