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Add x86 size relocation support to bfd
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf-nacl.h"
29 #include "elf-vxworks.h"
30 #include "bfd_stdint.h"
31 #include "objalloc.h"
32 #include "hashtab.h"
33 #include "dwarf2.h"
34
35 /* 386 uses REL relocations instead of RELA. */
36 #define USE_REL 1
37
38 #include "elf/i386.h"
39
40 static reloc_howto_type elf_howto_table[]=
41 {
42 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_NONE",
44 TRUE, 0x00000000, 0x00000000, FALSE),
45 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_32",
47 TRUE, 0xffffffff, 0xffffffff, FALSE),
48 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_PC32",
50 TRUE, 0xffffffff, 0xffffffff, TRUE),
51 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_GOT32",
53 TRUE, 0xffffffff, 0xffffffff, FALSE),
54 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_PLT32",
56 TRUE, 0xffffffff, 0xffffffff, TRUE),
57 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_COPY",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_RELATIVE",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTOFF",
71 TRUE, 0xffffffff, 0xffffffff, FALSE),
72 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_386_GOTPC",
74 TRUE, 0xffffffff, 0xffffffff, TRUE),
75
76 /* We have a gap in the reloc numbers here.
77 R_386_standard counts the number up to this point, and
78 R_386_ext_offset is the value to subtract from a reloc type of
79 R_386_16 thru R_386_PC8 to form an index into this table. */
80 #define R_386_standard (R_386_GOTPC + 1)
81 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82
83 /* These relocs are a GNU extension. */
84 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_IE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_LE",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_GD",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_TLS_LDM",
101 TRUE, 0xffffffff, 0xffffffff, FALSE),
102 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_16",
104 TRUE, 0xffff, 0xffff, FALSE),
105 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_PC16",
107 TRUE, 0xffff, 0xffff, TRUE),
108 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_386_8",
110 TRUE, 0xff, 0xff, FALSE),
111 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_386_PC8",
113 TRUE, 0xff, 0xff, TRUE),
114
115 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
116 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
117 /* These are common with Solaris TLS implementation. */
118 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
135 TRUE, 0xffffffff, 0xffffffff, FALSE),
136 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_malloc (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->sdynbss = NULL;
954 ret->srelbss = NULL;
955 ret->plt_eh_frame = NULL;
956 ret->tls_ldm_got.refcount = 0;
957 ret->next_tls_desc_index = 0;
958 ret->sgotplt_jump_table_size = 0;
959 ret->sym_cache.abfd = NULL;
960 ret->srelplt2 = NULL;
961 ret->tls_module_base = NULL;
962 ret->next_jump_slot_index = 0;
963 ret->next_irelative_index = 0;
964
965 ret->loc_hash_table = htab_try_create (1024,
966 elf_i386_local_htab_hash,
967 elf_i386_local_htab_eq,
968 NULL);
969 ret->loc_hash_memory = objalloc_create ();
970 if (!ret->loc_hash_table || !ret->loc_hash_memory)
971 {
972 free (ret);
973 return NULL;
974 }
975
976 return &ret->elf.root;
977 }
978
979 /* Destroy an i386 ELF linker hash table. */
980
981 static void
982 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
983 {
984 struct elf_i386_link_hash_table *htab
985 = (struct elf_i386_link_hash_table *) hash;
986
987 if (htab->loc_hash_table)
988 htab_delete (htab->loc_hash_table);
989 if (htab->loc_hash_memory)
990 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
991 _bfd_generic_link_hash_table_free (hash);
992 }
993
994 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
995 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
996 hash table. */
997
998 static bfd_boolean
999 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1000 {
1001 struct elf_i386_link_hash_table *htab;
1002
1003 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1004 return FALSE;
1005
1006 htab = elf_i386_hash_table (info);
1007 if (htab == NULL)
1008 return FALSE;
1009
1010 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1011 if (!info->shared)
1012 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1013
1014 if (!htab->sdynbss
1015 || (!info->shared && !htab->srelbss))
1016 abort ();
1017
1018 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1019 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1020 &htab->srelplt2))
1021 return FALSE;
1022
1023 if (!info->no_ld_generated_unwind_info
1024 && htab->plt_eh_frame == NULL
1025 && htab->elf.splt != NULL)
1026 {
1027 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1028 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1029 | SEC_LINKER_CREATED);
1030 htab->plt_eh_frame
1031 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1032 if (htab->plt_eh_frame == NULL
1033 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1034 return FALSE;
1035 }
1036
1037 return TRUE;
1038 }
1039
1040 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1041
1042 static void
1043 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1044 struct elf_link_hash_entry *dir,
1045 struct elf_link_hash_entry *ind)
1046 {
1047 struct elf_i386_link_hash_entry *edir, *eind;
1048
1049 edir = (struct elf_i386_link_hash_entry *) dir;
1050 eind = (struct elf_i386_link_hash_entry *) ind;
1051
1052 if (eind->dyn_relocs != NULL)
1053 {
1054 if (edir->dyn_relocs != NULL)
1055 {
1056 struct elf_dyn_relocs **pp;
1057 struct elf_dyn_relocs *p;
1058
1059 /* Add reloc counts against the indirect sym to the direct sym
1060 list. Merge any entries against the same section. */
1061 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1062 {
1063 struct elf_dyn_relocs *q;
1064
1065 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1066 if (q->sec == p->sec)
1067 {
1068 q->pc_count += p->pc_count;
1069 q->count += p->count;
1070 *pp = p->next;
1071 break;
1072 }
1073 if (q == NULL)
1074 pp = &p->next;
1075 }
1076 *pp = edir->dyn_relocs;
1077 }
1078
1079 edir->dyn_relocs = eind->dyn_relocs;
1080 eind->dyn_relocs = NULL;
1081 }
1082
1083 if (ind->root.type == bfd_link_hash_indirect
1084 && dir->got.refcount <= 0)
1085 {
1086 edir->tls_type = eind->tls_type;
1087 eind->tls_type = GOT_UNKNOWN;
1088 }
1089
1090 if (ELIMINATE_COPY_RELOCS
1091 && ind->root.type != bfd_link_hash_indirect
1092 && dir->dynamic_adjusted)
1093 {
1094 /* If called to transfer flags for a weakdef during processing
1095 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1096 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1097 dir->ref_dynamic |= ind->ref_dynamic;
1098 dir->ref_regular |= ind->ref_regular;
1099 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1100 dir->needs_plt |= ind->needs_plt;
1101 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1102 }
1103 else
1104 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1105 }
1106
1107 /* Return TRUE if the TLS access code sequence support transition
1108 from R_TYPE. */
1109
1110 static bfd_boolean
1111 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1112 bfd_byte *contents,
1113 Elf_Internal_Shdr *symtab_hdr,
1114 struct elf_link_hash_entry **sym_hashes,
1115 unsigned int r_type,
1116 const Elf_Internal_Rela *rel,
1117 const Elf_Internal_Rela *relend)
1118 {
1119 unsigned int val, type;
1120 unsigned long r_symndx;
1121 struct elf_link_hash_entry *h;
1122 bfd_vma offset;
1123
1124 /* Get the section contents. */
1125 if (contents == NULL)
1126 {
1127 if (elf_section_data (sec)->this_hdr.contents != NULL)
1128 contents = elf_section_data (sec)->this_hdr.contents;
1129 else
1130 {
1131 /* FIXME: How to better handle error condition? */
1132 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1133 return FALSE;
1134
1135 /* Cache the section contents for elf_link_input_bfd. */
1136 elf_section_data (sec)->this_hdr.contents = contents;
1137 }
1138 }
1139
1140 offset = rel->r_offset;
1141 switch (r_type)
1142 {
1143 case R_386_TLS_GD:
1144 case R_386_TLS_LDM:
1145 if (offset < 2 || (rel + 1) >= relend)
1146 return FALSE;
1147
1148 type = bfd_get_8 (abfd, contents + offset - 2);
1149 if (r_type == R_386_TLS_GD)
1150 {
1151 /* Check transition from GD access model. Only
1152 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1153 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1154 can transit to different access model. */
1155 if ((offset + 10) > sec->size ||
1156 (type != 0x8d && type != 0x04))
1157 return FALSE;
1158
1159 val = bfd_get_8 (abfd, contents + offset - 1);
1160 if (type == 0x04)
1161 {
1162 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1163 if (offset < 3)
1164 return FALSE;
1165
1166 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1167 return FALSE;
1168
1169 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1170 return FALSE;
1171 }
1172 else
1173 {
1174 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1175 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1176 return FALSE;
1177
1178 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1179 return FALSE;
1180 }
1181 }
1182 else
1183 {
1184 /* Check transition from LD access model. Only
1185 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1186 can transit to different access model. */
1187 if (type != 0x8d || (offset + 9) > sec->size)
1188 return FALSE;
1189
1190 val = bfd_get_8 (abfd, contents + offset - 1);
1191 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1192 return FALSE;
1193 }
1194
1195 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1196 return FALSE;
1197
1198 r_symndx = ELF32_R_SYM (rel[1].r_info);
1199 if (r_symndx < symtab_hdr->sh_info)
1200 return FALSE;
1201
1202 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1203 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1204 may be versioned. */
1205 return (h != NULL
1206 && h->root.root.string != NULL
1207 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1208 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1209 && (strncmp (h->root.root.string, "___tls_get_addr",
1210 15) == 0));
1211
1212 case R_386_TLS_IE:
1213 /* Check transition from IE access model:
1214 movl foo@indntpoff(%rip), %eax
1215 movl foo@indntpoff(%rip), %reg
1216 addl foo@indntpoff(%rip), %reg
1217 */
1218
1219 if (offset < 1 || (offset + 4) > sec->size)
1220 return FALSE;
1221
1222 /* Check "movl foo@tpoff(%rip), %eax" first. */
1223 val = bfd_get_8 (abfd, contents + offset - 1);
1224 if (val == 0xa1)
1225 return TRUE;
1226
1227 if (offset < 2)
1228 return FALSE;
1229
1230 /* Check movl|addl foo@tpoff(%rip), %reg. */
1231 type = bfd_get_8 (abfd, contents + offset - 2);
1232 return ((type == 0x8b || type == 0x03)
1233 && (val & 0xc7) == 0x05);
1234
1235 case R_386_TLS_GOTIE:
1236 case R_386_TLS_IE_32:
1237 /* Check transition from {IE_32,GOTIE} access model:
1238 subl foo@{tpoff,gontoff}(%reg1), %reg2
1239 movl foo@{tpoff,gontoff}(%reg1), %reg2
1240 addl foo@{tpoff,gontoff}(%reg1), %reg2
1241 */
1242
1243 if (offset < 2 || (offset + 4) > sec->size)
1244 return FALSE;
1245
1246 val = bfd_get_8 (abfd, contents + offset - 1);
1247 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1248 return FALSE;
1249
1250 type = bfd_get_8 (abfd, contents + offset - 2);
1251 return type == 0x8b || type == 0x2b || type == 0x03;
1252
1253 case R_386_TLS_GOTDESC:
1254 /* Check transition from GDesc access model:
1255 leal x@tlsdesc(%ebx), %eax
1256
1257 Make sure it's a leal adding ebx to a 32-bit offset
1258 into any register, although it's probably almost always
1259 going to be eax. */
1260
1261 if (offset < 2 || (offset + 4) > sec->size)
1262 return FALSE;
1263
1264 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1265 return FALSE;
1266
1267 val = bfd_get_8 (abfd, contents + offset - 1);
1268 return (val & 0xc7) == 0x83;
1269
1270 case R_386_TLS_DESC_CALL:
1271 /* Check transition from GDesc access model:
1272 call *x@tlsdesc(%rax)
1273 */
1274 if (offset + 2 <= sec->size)
1275 {
1276 /* Make sure that it's a call *x@tlsdesc(%rax). */
1277 static const unsigned char call[] = { 0xff, 0x10 };
1278 return memcmp (contents + offset, call, 2) == 0;
1279 }
1280
1281 return FALSE;
1282
1283 default:
1284 abort ();
1285 }
1286 }
1287
1288 /* Return TRUE if the TLS access transition is OK or no transition
1289 will be performed. Update R_TYPE if there is a transition. */
1290
1291 static bfd_boolean
1292 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1293 asection *sec, bfd_byte *contents,
1294 Elf_Internal_Shdr *symtab_hdr,
1295 struct elf_link_hash_entry **sym_hashes,
1296 unsigned int *r_type, int tls_type,
1297 const Elf_Internal_Rela *rel,
1298 const Elf_Internal_Rela *relend,
1299 struct elf_link_hash_entry *h,
1300 unsigned long r_symndx)
1301 {
1302 unsigned int from_type = *r_type;
1303 unsigned int to_type = from_type;
1304 bfd_boolean check = TRUE;
1305
1306 /* Skip TLS transition for functions. */
1307 if (h != NULL
1308 && (h->type == STT_FUNC
1309 || h->type == STT_GNU_IFUNC))
1310 return TRUE;
1311
1312 switch (from_type)
1313 {
1314 case R_386_TLS_GD:
1315 case R_386_TLS_GOTDESC:
1316 case R_386_TLS_DESC_CALL:
1317 case R_386_TLS_IE_32:
1318 case R_386_TLS_IE:
1319 case R_386_TLS_GOTIE:
1320 if (info->executable)
1321 {
1322 if (h == NULL)
1323 to_type = R_386_TLS_LE_32;
1324 else if (from_type != R_386_TLS_IE
1325 && from_type != R_386_TLS_GOTIE)
1326 to_type = R_386_TLS_IE_32;
1327 }
1328
1329 /* When we are called from elf_i386_relocate_section, CONTENTS
1330 isn't NULL and there may be additional transitions based on
1331 TLS_TYPE. */
1332 if (contents != NULL)
1333 {
1334 unsigned int new_to_type = to_type;
1335
1336 if (info->executable
1337 && h != NULL
1338 && h->dynindx == -1
1339 && (tls_type & GOT_TLS_IE))
1340 new_to_type = R_386_TLS_LE_32;
1341
1342 if (to_type == R_386_TLS_GD
1343 || to_type == R_386_TLS_GOTDESC
1344 || to_type == R_386_TLS_DESC_CALL)
1345 {
1346 if (tls_type == GOT_TLS_IE_POS)
1347 new_to_type = R_386_TLS_GOTIE;
1348 else if (tls_type & GOT_TLS_IE)
1349 new_to_type = R_386_TLS_IE_32;
1350 }
1351
1352 /* We checked the transition before when we were called from
1353 elf_i386_check_relocs. We only want to check the new
1354 transition which hasn't been checked before. */
1355 check = new_to_type != to_type && from_type == to_type;
1356 to_type = new_to_type;
1357 }
1358
1359 break;
1360
1361 case R_386_TLS_LDM:
1362 if (info->executable)
1363 to_type = R_386_TLS_LE_32;
1364 break;
1365
1366 default:
1367 return TRUE;
1368 }
1369
1370 /* Return TRUE if there is no transition. */
1371 if (from_type == to_type)
1372 return TRUE;
1373
1374 /* Check if the transition can be performed. */
1375 if (check
1376 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1377 symtab_hdr, sym_hashes,
1378 from_type, rel, relend))
1379 {
1380 reloc_howto_type *from, *to;
1381 const char *name;
1382
1383 from = elf_i386_rtype_to_howto (abfd, from_type);
1384 to = elf_i386_rtype_to_howto (abfd, to_type);
1385
1386 if (h)
1387 name = h->root.root.string;
1388 else
1389 {
1390 struct elf_i386_link_hash_table *htab;
1391
1392 htab = elf_i386_hash_table (info);
1393 if (htab == NULL)
1394 name = "*unknown*";
1395 else
1396 {
1397 Elf_Internal_Sym *isym;
1398
1399 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1400 abfd, r_symndx);
1401 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1402 }
1403 }
1404
1405 (*_bfd_error_handler)
1406 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1407 "in section `%A' failed"),
1408 abfd, sec, from->name, to->name, name,
1409 (unsigned long) rel->r_offset);
1410 bfd_set_error (bfd_error_bad_value);
1411 return FALSE;
1412 }
1413
1414 *r_type = to_type;
1415 return TRUE;
1416 }
1417
1418 /* Look through the relocs for a section during the first phase, and
1419 calculate needed space in the global offset table, procedure linkage
1420 table, and dynamic reloc sections. */
1421
1422 static bfd_boolean
1423 elf_i386_check_relocs (bfd *abfd,
1424 struct bfd_link_info *info,
1425 asection *sec,
1426 const Elf_Internal_Rela *relocs)
1427 {
1428 struct elf_i386_link_hash_table *htab;
1429 Elf_Internal_Shdr *symtab_hdr;
1430 struct elf_link_hash_entry **sym_hashes;
1431 const Elf_Internal_Rela *rel;
1432 const Elf_Internal_Rela *rel_end;
1433 asection *sreloc;
1434
1435 if (info->relocatable)
1436 return TRUE;
1437
1438 BFD_ASSERT (is_i386_elf (abfd));
1439
1440 htab = elf_i386_hash_table (info);
1441 if (htab == NULL)
1442 return FALSE;
1443
1444 symtab_hdr = &elf_symtab_hdr (abfd);
1445 sym_hashes = elf_sym_hashes (abfd);
1446
1447 sreloc = NULL;
1448
1449 rel_end = relocs + sec->reloc_count;
1450 for (rel = relocs; rel < rel_end; rel++)
1451 {
1452 unsigned int r_type;
1453 unsigned long r_symndx;
1454 struct elf_link_hash_entry *h;
1455 Elf_Internal_Sym *isym;
1456 const char *name;
1457
1458 r_symndx = ELF32_R_SYM (rel->r_info);
1459 r_type = ELF32_R_TYPE (rel->r_info);
1460
1461 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1462 {
1463 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1464 abfd,
1465 r_symndx);
1466 return FALSE;
1467 }
1468
1469 if (r_symndx < symtab_hdr->sh_info)
1470 {
1471 /* A local symbol. */
1472 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1473 abfd, r_symndx);
1474 if (isym == NULL)
1475 return FALSE;
1476
1477 /* Check relocation against local STT_GNU_IFUNC symbol. */
1478 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1479 {
1480 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1481 if (h == NULL)
1482 return FALSE;
1483
1484 /* Fake a STT_GNU_IFUNC symbol. */
1485 h->type = STT_GNU_IFUNC;
1486 h->def_regular = 1;
1487 h->ref_regular = 1;
1488 h->forced_local = 1;
1489 h->root.type = bfd_link_hash_defined;
1490 }
1491 else
1492 h = NULL;
1493 }
1494 else
1495 {
1496 isym = NULL;
1497 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1498 while (h->root.type == bfd_link_hash_indirect
1499 || h->root.type == bfd_link_hash_warning)
1500 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1501 }
1502
1503 if (h != NULL)
1504 {
1505 /* Create the ifunc sections for static executables. If we
1506 never see an indirect function symbol nor we are building
1507 a static executable, those sections will be empty and
1508 won't appear in output. */
1509 switch (r_type)
1510 {
1511 default:
1512 break;
1513
1514 case R_386_32:
1515 case R_386_PC32:
1516 case R_386_PLT32:
1517 case R_386_GOT32:
1518 case R_386_GOTOFF:
1519 if (htab->elf.dynobj == NULL)
1520 htab->elf.dynobj = abfd;
1521 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1522 return FALSE;
1523 break;
1524 }
1525
1526 /* It is referenced by a non-shared object. */
1527 h->ref_regular = 1;
1528 }
1529
1530 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1531 symtab_hdr, sym_hashes,
1532 &r_type, GOT_UNKNOWN,
1533 rel, rel_end, h, r_symndx))
1534 return FALSE;
1535
1536 switch (r_type)
1537 {
1538 case R_386_TLS_LDM:
1539 htab->tls_ldm_got.refcount += 1;
1540 goto create_got;
1541
1542 case R_386_PLT32:
1543 /* This symbol requires a procedure linkage table entry. We
1544 actually build the entry in adjust_dynamic_symbol,
1545 because this might be a case of linking PIC code which is
1546 never referenced by a dynamic object, in which case we
1547 don't need to generate a procedure linkage table entry
1548 after all. */
1549
1550 /* If this is a local symbol, we resolve it directly without
1551 creating a procedure linkage table entry. */
1552 if (h == NULL)
1553 continue;
1554
1555 h->needs_plt = 1;
1556 h->plt.refcount += 1;
1557 break;
1558
1559 case R_386_TLS_IE_32:
1560 case R_386_TLS_IE:
1561 case R_386_TLS_GOTIE:
1562 if (!info->executable)
1563 info->flags |= DF_STATIC_TLS;
1564 /* Fall through */
1565
1566 case R_386_GOT32:
1567 case R_386_TLS_GD:
1568 case R_386_TLS_GOTDESC:
1569 case R_386_TLS_DESC_CALL:
1570 /* This symbol requires a global offset table entry. */
1571 {
1572 int tls_type, old_tls_type;
1573
1574 switch (r_type)
1575 {
1576 default:
1577 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1578 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1579 case R_386_TLS_GOTDESC:
1580 case R_386_TLS_DESC_CALL:
1581 tls_type = GOT_TLS_GDESC; break;
1582 case R_386_TLS_IE_32:
1583 if (ELF32_R_TYPE (rel->r_info) == r_type)
1584 tls_type = GOT_TLS_IE_NEG;
1585 else
1586 /* If this is a GD->IE transition, we may use either of
1587 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1588 tls_type = GOT_TLS_IE;
1589 break;
1590 case R_386_TLS_IE:
1591 case R_386_TLS_GOTIE:
1592 tls_type = GOT_TLS_IE_POS; break;
1593 }
1594
1595 if (h != NULL)
1596 {
1597 h->got.refcount += 1;
1598 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1599 }
1600 else
1601 {
1602 bfd_signed_vma *local_got_refcounts;
1603
1604 /* This is a global offset table entry for a local symbol. */
1605 local_got_refcounts = elf_local_got_refcounts (abfd);
1606 if (local_got_refcounts == NULL)
1607 {
1608 bfd_size_type size;
1609
1610 size = symtab_hdr->sh_info;
1611 size *= (sizeof (bfd_signed_vma)
1612 + sizeof (bfd_vma) + sizeof(char));
1613 local_got_refcounts = (bfd_signed_vma *)
1614 bfd_zalloc (abfd, size);
1615 if (local_got_refcounts == NULL)
1616 return FALSE;
1617 elf_local_got_refcounts (abfd) = local_got_refcounts;
1618 elf_i386_local_tlsdesc_gotent (abfd)
1619 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1620 elf_i386_local_got_tls_type (abfd)
1621 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1622 }
1623 local_got_refcounts[r_symndx] += 1;
1624 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1625 }
1626
1627 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1628 tls_type |= old_tls_type;
1629 /* If a TLS symbol is accessed using IE at least once,
1630 there is no point to use dynamic model for it. */
1631 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1632 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1633 || (tls_type & GOT_TLS_IE) == 0))
1634 {
1635 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1636 tls_type = old_tls_type;
1637 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1638 && GOT_TLS_GD_ANY_P (tls_type))
1639 tls_type |= old_tls_type;
1640 else
1641 {
1642 if (h)
1643 name = h->root.root.string;
1644 else
1645 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1646 NULL);
1647 (*_bfd_error_handler)
1648 (_("%B: `%s' accessed both as normal and "
1649 "thread local symbol"),
1650 abfd, name);
1651 bfd_set_error (bfd_error_bad_value);
1652 return FALSE;
1653 }
1654 }
1655
1656 if (old_tls_type != tls_type)
1657 {
1658 if (h != NULL)
1659 elf_i386_hash_entry (h)->tls_type = tls_type;
1660 else
1661 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1662 }
1663 }
1664 /* Fall through */
1665
1666 case R_386_GOTOFF:
1667 case R_386_GOTPC:
1668 create_got:
1669 if (htab->elf.sgot == NULL)
1670 {
1671 if (htab->elf.dynobj == NULL)
1672 htab->elf.dynobj = abfd;
1673 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1674 return FALSE;
1675 }
1676 if (r_type != R_386_TLS_IE)
1677 break;
1678 /* Fall through */
1679
1680 case R_386_TLS_LE_32:
1681 case R_386_TLS_LE:
1682 if (info->executable)
1683 break;
1684 info->flags |= DF_STATIC_TLS;
1685 /* Fall through */
1686
1687 case R_386_32:
1688 case R_386_PC32:
1689 case R_386_SIZE32:
1690 if (h != NULL && info->executable)
1691 {
1692 /* If this reloc is in a read-only section, we might
1693 need a copy reloc. We can't check reliably at this
1694 stage whether the section is read-only, as input
1695 sections have not yet been mapped to output sections.
1696 Tentatively set the flag for now, and correct in
1697 adjust_dynamic_symbol. */
1698 h->non_got_ref = 1;
1699
1700 /* We may need a .plt entry if the function this reloc
1701 refers to is in a shared lib. */
1702 h->plt.refcount += 1;
1703 if (r_type != R_386_PC32)
1704 h->pointer_equality_needed = 1;
1705 }
1706
1707 /* If we are creating a shared library, and this is a reloc
1708 against a global symbol, or a non PC relative reloc
1709 against a local symbol, then we need to copy the reloc
1710 into the shared library. However, if we are linking with
1711 -Bsymbolic, we do not need to copy a reloc against a
1712 global symbol which is defined in an object we are
1713 including in the link (i.e., DEF_REGULAR is set). At
1714 this point we have not seen all the input files, so it is
1715 possible that DEF_REGULAR is not set now but will be set
1716 later (it is never cleared). In case of a weak definition,
1717 DEF_REGULAR may be cleared later by a strong definition in
1718 a shared library. We account for that possibility below by
1719 storing information in the relocs_copied field of the hash
1720 table entry. A similar situation occurs when creating
1721 shared libraries and symbol visibility changes render the
1722 symbol local.
1723
1724 If on the other hand, we are creating an executable, we
1725 may need to keep relocations for symbols satisfied by a
1726 dynamic library if we manage to avoid copy relocs for the
1727 symbol. */
1728 if ((info->shared
1729 && (sec->flags & SEC_ALLOC) != 0
1730 && (r_type != R_386_PC32
1731 || (h != NULL
1732 && (! SYMBOLIC_BIND (info, h)
1733 || h->root.type == bfd_link_hash_defweak
1734 || !h->def_regular))))
1735 || (ELIMINATE_COPY_RELOCS
1736 && !info->shared
1737 && (sec->flags & SEC_ALLOC) != 0
1738 && h != NULL
1739 && (h->root.type == bfd_link_hash_defweak
1740 || !h->def_regular)))
1741 {
1742 struct elf_dyn_relocs *p;
1743 struct elf_dyn_relocs **head;
1744
1745 /* We must copy these reloc types into the output file.
1746 Create a reloc section in dynobj and make room for
1747 this reloc. */
1748 if (sreloc == NULL)
1749 {
1750 if (htab->elf.dynobj == NULL)
1751 htab->elf.dynobj = abfd;
1752
1753 sreloc = _bfd_elf_make_dynamic_reloc_section
1754 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1755
1756 if (sreloc == NULL)
1757 return FALSE;
1758 }
1759
1760 /* If this is a global symbol, we count the number of
1761 relocations we need for this symbol. */
1762 if (h != NULL)
1763 {
1764 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1765 }
1766 else
1767 {
1768 /* Track dynamic relocs needed for local syms too.
1769 We really need local syms available to do this
1770 easily. Oh well. */
1771 void **vpp;
1772 asection *s;
1773
1774 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1775 abfd, r_symndx);
1776 if (isym == NULL)
1777 return FALSE;
1778
1779 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1780 if (s == NULL)
1781 s = sec;
1782
1783 vpp = &elf_section_data (s)->local_dynrel;
1784 head = (struct elf_dyn_relocs **)vpp;
1785 }
1786
1787 p = *head;
1788 if (p == NULL || p->sec != sec)
1789 {
1790 bfd_size_type amt = sizeof *p;
1791 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1792 amt);
1793 if (p == NULL)
1794 return FALSE;
1795 p->next = *head;
1796 *head = p;
1797 p->sec = sec;
1798 p->count = 0;
1799 p->pc_count = 0;
1800 }
1801
1802 p->count += 1;
1803 if (r_type == R_386_PC32)
1804 p->pc_count += 1;
1805 }
1806 break;
1807
1808 /* This relocation describes the C++ object vtable hierarchy.
1809 Reconstruct it for later use during GC. */
1810 case R_386_GNU_VTINHERIT:
1811 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1812 return FALSE;
1813 break;
1814
1815 /* This relocation describes which C++ vtable entries are actually
1816 used. Record for later use during GC. */
1817 case R_386_GNU_VTENTRY:
1818 BFD_ASSERT (h != NULL);
1819 if (h != NULL
1820 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1821 return FALSE;
1822 break;
1823
1824 default:
1825 break;
1826 }
1827 }
1828
1829 return TRUE;
1830 }
1831
1832 /* Return the section that should be marked against GC for a given
1833 relocation. */
1834
1835 static asection *
1836 elf_i386_gc_mark_hook (asection *sec,
1837 struct bfd_link_info *info,
1838 Elf_Internal_Rela *rel,
1839 struct elf_link_hash_entry *h,
1840 Elf_Internal_Sym *sym)
1841 {
1842 if (h != NULL)
1843 switch (ELF32_R_TYPE (rel->r_info))
1844 {
1845 case R_386_GNU_VTINHERIT:
1846 case R_386_GNU_VTENTRY:
1847 return NULL;
1848 }
1849
1850 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1851 }
1852
1853 /* Update the got entry reference counts for the section being removed. */
1854
1855 static bfd_boolean
1856 elf_i386_gc_sweep_hook (bfd *abfd,
1857 struct bfd_link_info *info,
1858 asection *sec,
1859 const Elf_Internal_Rela *relocs)
1860 {
1861 struct elf_i386_link_hash_table *htab;
1862 Elf_Internal_Shdr *symtab_hdr;
1863 struct elf_link_hash_entry **sym_hashes;
1864 bfd_signed_vma *local_got_refcounts;
1865 const Elf_Internal_Rela *rel, *relend;
1866
1867 if (info->relocatable)
1868 return TRUE;
1869
1870 htab = elf_i386_hash_table (info);
1871 if (htab == NULL)
1872 return FALSE;
1873
1874 elf_section_data (sec)->local_dynrel = NULL;
1875
1876 symtab_hdr = &elf_symtab_hdr (abfd);
1877 sym_hashes = elf_sym_hashes (abfd);
1878 local_got_refcounts = elf_local_got_refcounts (abfd);
1879
1880 relend = relocs + sec->reloc_count;
1881 for (rel = relocs; rel < relend; rel++)
1882 {
1883 unsigned long r_symndx;
1884 unsigned int r_type;
1885 struct elf_link_hash_entry *h = NULL;
1886
1887 r_symndx = ELF32_R_SYM (rel->r_info);
1888 if (r_symndx >= symtab_hdr->sh_info)
1889 {
1890 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1891 while (h->root.type == bfd_link_hash_indirect
1892 || h->root.type == bfd_link_hash_warning)
1893 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1894 }
1895 else
1896 {
1897 /* A local symbol. */
1898 Elf_Internal_Sym *isym;
1899
1900 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1901 abfd, r_symndx);
1902
1903 /* Check relocation against local STT_GNU_IFUNC symbol. */
1904 if (isym != NULL
1905 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1906 {
1907 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1908 if (h == NULL)
1909 abort ();
1910 }
1911 }
1912
1913 if (h)
1914 {
1915 struct elf_i386_link_hash_entry *eh;
1916 struct elf_dyn_relocs **pp;
1917 struct elf_dyn_relocs *p;
1918
1919 eh = (struct elf_i386_link_hash_entry *) h;
1920 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1921 if (p->sec == sec)
1922 {
1923 /* Everything must go for SEC. */
1924 *pp = p->next;
1925 break;
1926 }
1927 }
1928
1929 r_type = ELF32_R_TYPE (rel->r_info);
1930 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1931 symtab_hdr, sym_hashes,
1932 &r_type, GOT_UNKNOWN,
1933 rel, relend, h, r_symndx))
1934 return FALSE;
1935
1936 switch (r_type)
1937 {
1938 case R_386_TLS_LDM:
1939 if (htab->tls_ldm_got.refcount > 0)
1940 htab->tls_ldm_got.refcount -= 1;
1941 break;
1942
1943 case R_386_TLS_GD:
1944 case R_386_TLS_GOTDESC:
1945 case R_386_TLS_DESC_CALL:
1946 case R_386_TLS_IE_32:
1947 case R_386_TLS_IE:
1948 case R_386_TLS_GOTIE:
1949 case R_386_GOT32:
1950 if (h != NULL)
1951 {
1952 if (h->got.refcount > 0)
1953 h->got.refcount -= 1;
1954 if (h->type == STT_GNU_IFUNC)
1955 {
1956 if (h->plt.refcount > 0)
1957 h->plt.refcount -= 1;
1958 }
1959 }
1960 else if (local_got_refcounts != NULL)
1961 {
1962 if (local_got_refcounts[r_symndx] > 0)
1963 local_got_refcounts[r_symndx] -= 1;
1964 }
1965 break;
1966
1967 case R_386_32:
1968 case R_386_PC32:
1969 case R_386_SIZE32:
1970 if (info->shared
1971 && (h == NULL || h->type != STT_GNU_IFUNC))
1972 break;
1973 /* Fall through */
1974
1975 case R_386_PLT32:
1976 if (h != NULL)
1977 {
1978 if (h->plt.refcount > 0)
1979 h->plt.refcount -= 1;
1980 }
1981 break;
1982
1983 case R_386_GOTOFF:
1984 if (h != NULL && h->type == STT_GNU_IFUNC)
1985 {
1986 if (h->got.refcount > 0)
1987 h->got.refcount -= 1;
1988 if (h->plt.refcount > 0)
1989 h->plt.refcount -= 1;
1990 }
1991 break;
1992
1993 default:
1994 break;
1995 }
1996 }
1997
1998 return TRUE;
1999 }
2000
2001 /* Adjust a symbol defined by a dynamic object and referenced by a
2002 regular object. The current definition is in some section of the
2003 dynamic object, but we're not including those sections. We have to
2004 change the definition to something the rest of the link can
2005 understand. */
2006
2007 static bfd_boolean
2008 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2009 struct elf_link_hash_entry *h)
2010 {
2011 struct elf_i386_link_hash_table *htab;
2012 asection *s;
2013 struct elf_i386_link_hash_entry *eh;
2014 struct elf_dyn_relocs *p;
2015
2016 /* STT_GNU_IFUNC symbol must go through PLT. */
2017 if (h->type == STT_GNU_IFUNC)
2018 {
2019 /* All local STT_GNU_IFUNC references must be treate as local
2020 calls via local PLT. */
2021 if (h->ref_regular
2022 && SYMBOL_CALLS_LOCAL (info, h))
2023 {
2024 bfd_size_type pc_count = 0, count = 0;
2025 struct elf_dyn_relocs **pp;
2026
2027 eh = (struct elf_i386_link_hash_entry *) h;
2028 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2029 {
2030 pc_count += p->pc_count;
2031 p->count -= p->pc_count;
2032 p->pc_count = 0;
2033 count += p->count;
2034 if (p->count == 0)
2035 *pp = p->next;
2036 else
2037 pp = &p->next;
2038 }
2039
2040 if (pc_count || count)
2041 {
2042 h->needs_plt = 1;
2043 h->non_got_ref = 1;
2044 if (h->plt.refcount <= 0)
2045 h->plt.refcount = 1;
2046 else
2047 h->plt.refcount += 1;
2048 }
2049 }
2050
2051 if (h->plt.refcount <= 0)
2052 {
2053 h->plt.offset = (bfd_vma) -1;
2054 h->needs_plt = 0;
2055 }
2056 return TRUE;
2057 }
2058
2059 /* If this is a function, put it in the procedure linkage table. We
2060 will fill in the contents of the procedure linkage table later,
2061 when we know the address of the .got section. */
2062 if (h->type == STT_FUNC
2063 || h->needs_plt)
2064 {
2065 if (h->plt.refcount <= 0
2066 || SYMBOL_CALLS_LOCAL (info, h)
2067 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2068 && h->root.type == bfd_link_hash_undefweak))
2069 {
2070 /* This case can occur if we saw a PLT32 reloc in an input
2071 file, but the symbol was never referred to by a dynamic
2072 object, or if all references were garbage collected. In
2073 such a case, we don't actually need to build a procedure
2074 linkage table, and we can just do a PC32 reloc instead. */
2075 h->plt.offset = (bfd_vma) -1;
2076 h->needs_plt = 0;
2077 }
2078
2079 return TRUE;
2080 }
2081 else
2082 /* It's possible that we incorrectly decided a .plt reloc was
2083 needed for an R_386_PC32 reloc to a non-function sym in
2084 check_relocs. We can't decide accurately between function and
2085 non-function syms in check-relocs; Objects loaded later in
2086 the link may change h->type. So fix it now. */
2087 h->plt.offset = (bfd_vma) -1;
2088
2089 /* If this is a weak symbol, and there is a real definition, the
2090 processor independent code will have arranged for us to see the
2091 real definition first, and we can just use the same value. */
2092 if (h->u.weakdef != NULL)
2093 {
2094 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2095 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2096 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2097 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2098 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2099 h->non_got_ref = h->u.weakdef->non_got_ref;
2100 return TRUE;
2101 }
2102
2103 /* This is a reference to a symbol defined by a dynamic object which
2104 is not a function. */
2105
2106 /* If we are creating a shared library, we must presume that the
2107 only references to the symbol are via the global offset table.
2108 For such cases we need not do anything here; the relocations will
2109 be handled correctly by relocate_section. */
2110 if (info->shared)
2111 return TRUE;
2112
2113 /* If there are no references to this symbol that do not use the
2114 GOT, we don't need to generate a copy reloc. */
2115 if (!h->non_got_ref)
2116 return TRUE;
2117
2118 /* If -z nocopyreloc was given, we won't generate them either. */
2119 if (info->nocopyreloc)
2120 {
2121 h->non_got_ref = 0;
2122 return TRUE;
2123 }
2124
2125 htab = elf_i386_hash_table (info);
2126 if (htab == NULL)
2127 return FALSE;
2128
2129 /* If there aren't any dynamic relocs in read-only sections, then
2130 we can keep the dynamic relocs and avoid the copy reloc. This
2131 doesn't work on VxWorks, where we can not have dynamic relocations
2132 (other than copy and jump slot relocations) in an executable. */
2133 if (ELIMINATE_COPY_RELOCS
2134 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2135 {
2136 eh = (struct elf_i386_link_hash_entry *) h;
2137 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2138 {
2139 s = p->sec->output_section;
2140 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2141 break;
2142 }
2143
2144 if (p == NULL)
2145 {
2146 h->non_got_ref = 0;
2147 return TRUE;
2148 }
2149 }
2150
2151 /* We must allocate the symbol in our .dynbss section, which will
2152 become part of the .bss section of the executable. There will be
2153 an entry for this symbol in the .dynsym section. The dynamic
2154 object will contain position independent code, so all references
2155 from the dynamic object to this symbol will go through the global
2156 offset table. The dynamic linker will use the .dynsym entry to
2157 determine the address it must put in the global offset table, so
2158 both the dynamic object and the regular object will refer to the
2159 same memory location for the variable. */
2160
2161 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2162 copy the initial value out of the dynamic object and into the
2163 runtime process image. */
2164 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2165 {
2166 htab->srelbss->size += sizeof (Elf32_External_Rel);
2167 h->needs_copy = 1;
2168 }
2169
2170 s = htab->sdynbss;
2171
2172 return _bfd_elf_adjust_dynamic_copy (h, s);
2173 }
2174
2175 /* Allocate space in .plt, .got and associated reloc sections for
2176 dynamic relocs. */
2177
2178 static bfd_boolean
2179 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2180 {
2181 struct bfd_link_info *info;
2182 struct elf_i386_link_hash_table *htab;
2183 struct elf_i386_link_hash_entry *eh;
2184 struct elf_dyn_relocs *p;
2185 unsigned plt_entry_size;
2186
2187 if (h->root.type == bfd_link_hash_indirect)
2188 return TRUE;
2189
2190 eh = (struct elf_i386_link_hash_entry *) h;
2191
2192 info = (struct bfd_link_info *) inf;
2193 htab = elf_i386_hash_table (info);
2194 if (htab == NULL)
2195 return FALSE;
2196
2197 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2198
2199 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2200 here if it is defined and referenced in a non-shared object. */
2201 if (h->type == STT_GNU_IFUNC
2202 && h->def_regular)
2203 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2204 plt_entry_size, 4);
2205 else if (htab->elf.dynamic_sections_created
2206 && h->plt.refcount > 0)
2207 {
2208 /* Make sure this symbol is output as a dynamic symbol.
2209 Undefined weak syms won't yet be marked as dynamic. */
2210 if (h->dynindx == -1
2211 && !h->forced_local)
2212 {
2213 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2214 return FALSE;
2215 }
2216
2217 if (info->shared
2218 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2219 {
2220 asection *s = htab->elf.splt;
2221
2222 /* If this is the first .plt entry, make room for the special
2223 first entry. */
2224 if (s->size == 0)
2225 s->size += plt_entry_size;
2226
2227 h->plt.offset = s->size;
2228
2229 /* If this symbol is not defined in a regular file, and we are
2230 not generating a shared library, then set the symbol to this
2231 location in the .plt. This is required to make function
2232 pointers compare as equal between the normal executable and
2233 the shared library. */
2234 if (! info->shared
2235 && !h->def_regular)
2236 {
2237 h->root.u.def.section = s;
2238 h->root.u.def.value = h->plt.offset;
2239 }
2240
2241 /* Make room for this entry. */
2242 s->size += plt_entry_size;
2243
2244 /* We also need to make an entry in the .got.plt section, which
2245 will be placed in the .got section by the linker script. */
2246 htab->elf.sgotplt->size += 4;
2247
2248 /* We also need to make an entry in the .rel.plt section. */
2249 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2250 htab->elf.srelplt->reloc_count++;
2251
2252 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2253 && !info->shared)
2254 {
2255 /* VxWorks has a second set of relocations for each PLT entry
2256 in executables. They go in a separate relocation section,
2257 which is processed by the kernel loader. */
2258
2259 /* There are two relocations for the initial PLT entry: an
2260 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2261 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2262
2263 if (h->plt.offset == plt_entry_size)
2264 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2265
2266 /* There are two extra relocations for each subsequent PLT entry:
2267 an R_386_32 relocation for the GOT entry, and an R_386_32
2268 relocation for the PLT entry. */
2269
2270 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2271 }
2272 }
2273 else
2274 {
2275 h->plt.offset = (bfd_vma) -1;
2276 h->needs_plt = 0;
2277 }
2278 }
2279 else
2280 {
2281 h->plt.offset = (bfd_vma) -1;
2282 h->needs_plt = 0;
2283 }
2284
2285 eh->tlsdesc_got = (bfd_vma) -1;
2286
2287 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2288 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2289 if (h->got.refcount > 0
2290 && info->executable
2291 && h->dynindx == -1
2292 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2293 h->got.offset = (bfd_vma) -1;
2294 else if (h->got.refcount > 0)
2295 {
2296 asection *s;
2297 bfd_boolean dyn;
2298 int tls_type = elf_i386_hash_entry(h)->tls_type;
2299
2300 /* Make sure this symbol is output as a dynamic symbol.
2301 Undefined weak syms won't yet be marked as dynamic. */
2302 if (h->dynindx == -1
2303 && !h->forced_local)
2304 {
2305 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2306 return FALSE;
2307 }
2308
2309 s = htab->elf.sgot;
2310 if (GOT_TLS_GDESC_P (tls_type))
2311 {
2312 eh->tlsdesc_got = htab->elf.sgotplt->size
2313 - elf_i386_compute_jump_table_size (htab);
2314 htab->elf.sgotplt->size += 8;
2315 h->got.offset = (bfd_vma) -2;
2316 }
2317 if (! GOT_TLS_GDESC_P (tls_type)
2318 || GOT_TLS_GD_P (tls_type))
2319 {
2320 h->got.offset = s->size;
2321 s->size += 4;
2322 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2323 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2324 s->size += 4;
2325 }
2326 dyn = htab->elf.dynamic_sections_created;
2327 /* R_386_TLS_IE_32 needs one dynamic relocation,
2328 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2329 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2330 need two), R_386_TLS_GD needs one if local symbol and two if
2331 global. */
2332 if (tls_type == GOT_TLS_IE_BOTH)
2333 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2334 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2335 || (tls_type & GOT_TLS_IE))
2336 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2337 else if (GOT_TLS_GD_P (tls_type))
2338 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2339 else if (! GOT_TLS_GDESC_P (tls_type)
2340 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2341 || h->root.type != bfd_link_hash_undefweak)
2342 && (info->shared
2343 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2344 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2345 if (GOT_TLS_GDESC_P (tls_type))
2346 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2347 }
2348 else
2349 h->got.offset = (bfd_vma) -1;
2350
2351 if (eh->dyn_relocs == NULL)
2352 return TRUE;
2353
2354 /* In the shared -Bsymbolic case, discard space allocated for
2355 dynamic pc-relative relocs against symbols which turn out to be
2356 defined in regular objects. For the normal shared case, discard
2357 space for pc-relative relocs that have become local due to symbol
2358 visibility changes. */
2359
2360 if (info->shared)
2361 {
2362 /* The only reloc that uses pc_count is R_386_PC32, which will
2363 appear on a call or on something like ".long foo - .". We
2364 want calls to protected symbols to resolve directly to the
2365 function rather than going via the plt. If people want
2366 function pointer comparisons to work as expected then they
2367 should avoid writing assembly like ".long foo - .". */
2368 if (SYMBOL_CALLS_LOCAL (info, h))
2369 {
2370 struct elf_dyn_relocs **pp;
2371
2372 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2373 {
2374 p->count -= p->pc_count;
2375 p->pc_count = 0;
2376 if (p->count == 0)
2377 *pp = p->next;
2378 else
2379 pp = &p->next;
2380 }
2381 }
2382
2383 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2384 {
2385 struct elf_dyn_relocs **pp;
2386 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2387 {
2388 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2389 *pp = p->next;
2390 else
2391 pp = &p->next;
2392 }
2393 }
2394
2395 /* Also discard relocs on undefined weak syms with non-default
2396 visibility. */
2397 if (eh->dyn_relocs != NULL
2398 && h->root.type == bfd_link_hash_undefweak)
2399 {
2400 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2401 eh->dyn_relocs = NULL;
2402
2403 /* Make sure undefined weak symbols are output as a dynamic
2404 symbol in PIEs. */
2405 else if (h->dynindx == -1
2406 && !h->forced_local)
2407 {
2408 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2409 return FALSE;
2410 }
2411 }
2412 }
2413 else if (ELIMINATE_COPY_RELOCS)
2414 {
2415 /* For the non-shared case, discard space for relocs against
2416 symbols which turn out to need copy relocs or are not
2417 dynamic. */
2418
2419 if (!h->non_got_ref
2420 && ((h->def_dynamic
2421 && !h->def_regular)
2422 || (htab->elf.dynamic_sections_created
2423 && (h->root.type == bfd_link_hash_undefweak
2424 || h->root.type == bfd_link_hash_undefined))))
2425 {
2426 /* Make sure this symbol is output as a dynamic symbol.
2427 Undefined weak syms won't yet be marked as dynamic. */
2428 if (h->dynindx == -1
2429 && !h->forced_local)
2430 {
2431 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2432 return FALSE;
2433 }
2434
2435 /* If that succeeded, we know we'll be keeping all the
2436 relocs. */
2437 if (h->dynindx != -1)
2438 goto keep;
2439 }
2440
2441 eh->dyn_relocs = NULL;
2442
2443 keep: ;
2444 }
2445
2446 /* Finally, allocate space. */
2447 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2448 {
2449 asection *sreloc;
2450
2451 sreloc = elf_section_data (p->sec)->sreloc;
2452
2453 BFD_ASSERT (sreloc != NULL);
2454 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2455 }
2456
2457 return TRUE;
2458 }
2459
2460 /* Allocate space in .plt, .got and associated reloc sections for
2461 local dynamic relocs. */
2462
2463 static bfd_boolean
2464 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2465 {
2466 struct elf_link_hash_entry *h
2467 = (struct elf_link_hash_entry *) *slot;
2468
2469 if (h->type != STT_GNU_IFUNC
2470 || !h->def_regular
2471 || !h->ref_regular
2472 || !h->forced_local
2473 || h->root.type != bfd_link_hash_defined)
2474 abort ();
2475
2476 return elf_i386_allocate_dynrelocs (h, inf);
2477 }
2478
2479 /* Find any dynamic relocs that apply to read-only sections. */
2480
2481 static bfd_boolean
2482 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2483 {
2484 struct elf_i386_link_hash_entry *eh;
2485 struct elf_dyn_relocs *p;
2486
2487 /* Skip local IFUNC symbols. */
2488 if (h->forced_local && h->type == STT_GNU_IFUNC)
2489 return TRUE;
2490
2491 eh = (struct elf_i386_link_hash_entry *) h;
2492 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2493 {
2494 asection *s = p->sec->output_section;
2495
2496 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2497 {
2498 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2499
2500 info->flags |= DF_TEXTREL;
2501
2502 if (info->warn_shared_textrel && info->shared)
2503 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2504 p->sec->owner, h->root.root.string,
2505 p->sec);
2506
2507 /* Not an error, just cut short the traversal. */
2508 return FALSE;
2509 }
2510 }
2511 return TRUE;
2512 }
2513
2514 /* Convert
2515 mov foo@GOT(%reg), %reg
2516 to
2517 lea foo@GOTOFF(%reg), %reg
2518 with the local symbol, foo. */
2519
2520 static bfd_boolean
2521 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2522 struct bfd_link_info *link_info)
2523 {
2524 Elf_Internal_Shdr *symtab_hdr;
2525 Elf_Internal_Rela *internal_relocs;
2526 Elf_Internal_Rela *irel, *irelend;
2527 bfd_byte *contents;
2528 struct elf_i386_link_hash_table *htab;
2529 bfd_boolean changed_contents;
2530 bfd_boolean changed_relocs;
2531 bfd_signed_vma *local_got_refcounts;
2532
2533 /* Don't even try to convert non-ELF outputs. */
2534 if (!is_elf_hash_table (link_info->hash))
2535 return FALSE;
2536
2537 /* Nothing to do if there are no codes, no relocations or no output. */
2538 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2539 || sec->reloc_count == 0
2540 || discarded_section (sec))
2541 return TRUE;
2542
2543 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2544
2545 /* Load the relocations for this section. */
2546 internal_relocs = (_bfd_elf_link_read_relocs
2547 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2548 link_info->keep_memory));
2549 if (internal_relocs == NULL)
2550 return FALSE;
2551
2552 htab = elf_i386_hash_table (link_info);
2553 changed_contents = FALSE;
2554 changed_relocs = FALSE;
2555 local_got_refcounts = elf_local_got_refcounts (abfd);
2556
2557 /* Get the section contents. */
2558 if (elf_section_data (sec)->this_hdr.contents != NULL)
2559 contents = elf_section_data (sec)->this_hdr.contents;
2560 else
2561 {
2562 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2563 goto error_return;
2564 }
2565
2566 irelend = internal_relocs + sec->reloc_count;
2567 for (irel = internal_relocs; irel < irelend; irel++)
2568 {
2569 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2570 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2571 unsigned int indx;
2572 struct elf_link_hash_entry *h;
2573
2574 if (r_type != R_386_GOT32)
2575 continue;
2576
2577 /* Get the symbol referred to by the reloc. */
2578 if (r_symndx < symtab_hdr->sh_info)
2579 {
2580 Elf_Internal_Sym *isym;
2581
2582 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2583 abfd, r_symndx);
2584
2585 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2586 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2587 && bfd_get_8 (input_bfd,
2588 contents + irel->r_offset - 2) == 0x8b)
2589 {
2590 bfd_put_8 (output_bfd, 0x8d,
2591 contents + irel->r_offset - 2);
2592 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2593 if (local_got_refcounts != NULL
2594 && local_got_refcounts[r_symndx] > 0)
2595 local_got_refcounts[r_symndx] -= 1;
2596 changed_contents = TRUE;
2597 changed_relocs = TRUE;
2598 }
2599 continue;
2600 }
2601
2602 indx = r_symndx - symtab_hdr->sh_info;
2603 h = elf_sym_hashes (abfd)[indx];
2604 BFD_ASSERT (h != NULL);
2605
2606 while (h->root.type == bfd_link_hash_indirect
2607 || h->root.type == bfd_link_hash_warning)
2608 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2609
2610 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2611 optimizing _DYNAMIC since ld.so may use its link-time address. */
2612 if (h->def_regular
2613 && h->type != STT_GNU_IFUNC
2614 && h != htab->elf.hdynamic
2615 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2616 && bfd_get_8 (input_bfd,
2617 contents + irel->r_offset - 2) == 0x8b)
2618 {
2619 bfd_put_8 (output_bfd, 0x8d,
2620 contents + irel->r_offset - 2);
2621 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2622 if (h->got.refcount > 0)
2623 h->got.refcount -= 1;
2624 changed_contents = TRUE;
2625 changed_relocs = TRUE;
2626 }
2627 }
2628
2629 if (contents != NULL
2630 && elf_section_data (sec)->this_hdr.contents != contents)
2631 {
2632 if (!changed_contents && !link_info->keep_memory)
2633 free (contents);
2634 else
2635 {
2636 /* Cache the section contents for elf_link_input_bfd. */
2637 elf_section_data (sec)->this_hdr.contents = contents;
2638 }
2639 }
2640
2641 if (elf_section_data (sec)->relocs != internal_relocs)
2642 {
2643 if (!changed_relocs)
2644 free (internal_relocs);
2645 else
2646 elf_section_data (sec)->relocs = internal_relocs;
2647 }
2648
2649 return TRUE;
2650
2651 error_return:
2652 if (contents != NULL
2653 && elf_section_data (sec)->this_hdr.contents != contents)
2654 free (contents);
2655 if (internal_relocs != NULL
2656 && elf_section_data (sec)->relocs != internal_relocs)
2657 free (internal_relocs);
2658 return FALSE;
2659 }
2660
2661 /* Set the sizes of the dynamic sections. */
2662
2663 static bfd_boolean
2664 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2665 {
2666 struct elf_i386_link_hash_table *htab;
2667 bfd *dynobj;
2668 asection *s;
2669 bfd_boolean relocs;
2670 bfd *ibfd;
2671
2672 htab = elf_i386_hash_table (info);
2673 if (htab == NULL)
2674 return FALSE;
2675 dynobj = htab->elf.dynobj;
2676 if (dynobj == NULL)
2677 abort ();
2678
2679 if (htab->elf.dynamic_sections_created)
2680 {
2681 /* Set the contents of the .interp section to the interpreter. */
2682 if (info->executable)
2683 {
2684 s = bfd_get_linker_section (dynobj, ".interp");
2685 if (s == NULL)
2686 abort ();
2687 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2688 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2689 }
2690 }
2691
2692 /* Set up .got offsets for local syms, and space for local dynamic
2693 relocs. */
2694 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2695 {
2696 bfd_signed_vma *local_got;
2697 bfd_signed_vma *end_local_got;
2698 char *local_tls_type;
2699 bfd_vma *local_tlsdesc_gotent;
2700 bfd_size_type locsymcount;
2701 Elf_Internal_Shdr *symtab_hdr;
2702 asection *srel;
2703
2704 if (! is_i386_elf (ibfd))
2705 continue;
2706
2707 for (s = ibfd->sections; s != NULL; s = s->next)
2708 {
2709 struct elf_dyn_relocs *p;
2710
2711 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2712 return FALSE;
2713
2714 for (p = ((struct elf_dyn_relocs *)
2715 elf_section_data (s)->local_dynrel);
2716 p != NULL;
2717 p = p->next)
2718 {
2719 if (!bfd_is_abs_section (p->sec)
2720 && bfd_is_abs_section (p->sec->output_section))
2721 {
2722 /* Input section has been discarded, either because
2723 it is a copy of a linkonce section or due to
2724 linker script /DISCARD/, so we'll be discarding
2725 the relocs too. */
2726 }
2727 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2728 && strcmp (p->sec->output_section->name,
2729 ".tls_vars") == 0)
2730 {
2731 /* Relocations in vxworks .tls_vars sections are
2732 handled specially by the loader. */
2733 }
2734 else if (p->count != 0)
2735 {
2736 srel = elf_section_data (p->sec)->sreloc;
2737 srel->size += p->count * sizeof (Elf32_External_Rel);
2738 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2739 && (info->flags & DF_TEXTREL) == 0)
2740 {
2741 info->flags |= DF_TEXTREL;
2742 if (info->warn_shared_textrel && info->shared)
2743 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2744 p->sec->owner, p->sec);
2745 }
2746 }
2747 }
2748 }
2749
2750 local_got = elf_local_got_refcounts (ibfd);
2751 if (!local_got)
2752 continue;
2753
2754 symtab_hdr = &elf_symtab_hdr (ibfd);
2755 locsymcount = symtab_hdr->sh_info;
2756 end_local_got = local_got + locsymcount;
2757 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2758 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2759 s = htab->elf.sgot;
2760 srel = htab->elf.srelgot;
2761 for (; local_got < end_local_got;
2762 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2763 {
2764 *local_tlsdesc_gotent = (bfd_vma) -1;
2765 if (*local_got > 0)
2766 {
2767 if (GOT_TLS_GDESC_P (*local_tls_type))
2768 {
2769 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2770 - elf_i386_compute_jump_table_size (htab);
2771 htab->elf.sgotplt->size += 8;
2772 *local_got = (bfd_vma) -2;
2773 }
2774 if (! GOT_TLS_GDESC_P (*local_tls_type)
2775 || GOT_TLS_GD_P (*local_tls_type))
2776 {
2777 *local_got = s->size;
2778 s->size += 4;
2779 if (GOT_TLS_GD_P (*local_tls_type)
2780 || *local_tls_type == GOT_TLS_IE_BOTH)
2781 s->size += 4;
2782 }
2783 if (info->shared
2784 || GOT_TLS_GD_ANY_P (*local_tls_type)
2785 || (*local_tls_type & GOT_TLS_IE))
2786 {
2787 if (*local_tls_type == GOT_TLS_IE_BOTH)
2788 srel->size += 2 * sizeof (Elf32_External_Rel);
2789 else if (GOT_TLS_GD_P (*local_tls_type)
2790 || ! GOT_TLS_GDESC_P (*local_tls_type))
2791 srel->size += sizeof (Elf32_External_Rel);
2792 if (GOT_TLS_GDESC_P (*local_tls_type))
2793 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2794 }
2795 }
2796 else
2797 *local_got = (bfd_vma) -1;
2798 }
2799 }
2800
2801 if (htab->tls_ldm_got.refcount > 0)
2802 {
2803 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2804 relocs. */
2805 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2806 htab->elf.sgot->size += 8;
2807 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2808 }
2809 else
2810 htab->tls_ldm_got.offset = -1;
2811
2812 /* Allocate global sym .plt and .got entries, and space for global
2813 sym dynamic relocs. */
2814 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2815
2816 /* Allocate .plt and .got entries, and space for local symbols. */
2817 htab_traverse (htab->loc_hash_table,
2818 elf_i386_allocate_local_dynrelocs,
2819 info);
2820
2821 /* For every jump slot reserved in the sgotplt, reloc_count is
2822 incremented. However, when we reserve space for TLS descriptors,
2823 it's not incremented, so in order to compute the space reserved
2824 for them, it suffices to multiply the reloc count by the jump
2825 slot size.
2826
2827 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2828 so that R_386_IRELATIVE entries come last. */
2829 if (htab->elf.srelplt)
2830 {
2831 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2832 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2833 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2834 }
2835 else if (htab->elf.irelplt)
2836 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2837
2838
2839 if (htab->elf.sgotplt)
2840 {
2841 /* Don't allocate .got.plt section if there are no GOT nor PLT
2842 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2843 if ((htab->elf.hgot == NULL
2844 || !htab->elf.hgot->ref_regular_nonweak)
2845 && (htab->elf.sgotplt->size
2846 == get_elf_backend_data (output_bfd)->got_header_size)
2847 && (htab->elf.splt == NULL
2848 || htab->elf.splt->size == 0)
2849 && (htab->elf.sgot == NULL
2850 || htab->elf.sgot->size == 0)
2851 && (htab->elf.iplt == NULL
2852 || htab->elf.iplt->size == 0)
2853 && (htab->elf.igotplt == NULL
2854 || htab->elf.igotplt->size == 0))
2855 htab->elf.sgotplt->size = 0;
2856 }
2857
2858
2859 if (htab->plt_eh_frame != NULL
2860 && htab->elf.splt != NULL
2861 && htab->elf.splt->size != 0
2862 && !bfd_is_abs_section (htab->elf.splt->output_section)
2863 && _bfd_elf_eh_frame_present (info))
2864 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2865
2866 /* We now have determined the sizes of the various dynamic sections.
2867 Allocate memory for them. */
2868 relocs = FALSE;
2869 for (s = dynobj->sections; s != NULL; s = s->next)
2870 {
2871 bfd_boolean strip_section = TRUE;
2872
2873 if ((s->flags & SEC_LINKER_CREATED) == 0)
2874 continue;
2875
2876 if (s == htab->elf.splt
2877 || s == htab->elf.sgot)
2878 {
2879 /* Strip this section if we don't need it; see the
2880 comment below. */
2881 /* We'd like to strip these sections if they aren't needed, but if
2882 we've exported dynamic symbols from them we must leave them.
2883 It's too late to tell BFD to get rid of the symbols. */
2884
2885 if (htab->elf.hplt != NULL)
2886 strip_section = FALSE;
2887 }
2888 else if (s == htab->elf.sgotplt
2889 || s == htab->elf.iplt
2890 || s == htab->elf.igotplt
2891 || s == htab->plt_eh_frame
2892 || s == htab->sdynbss)
2893 {
2894 /* Strip these too. */
2895 }
2896 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2897 {
2898 if (s->size != 0
2899 && s != htab->elf.srelplt
2900 && s != htab->srelplt2)
2901 relocs = TRUE;
2902
2903 /* We use the reloc_count field as a counter if we need
2904 to copy relocs into the output file. */
2905 s->reloc_count = 0;
2906 }
2907 else
2908 {
2909 /* It's not one of our sections, so don't allocate space. */
2910 continue;
2911 }
2912
2913 if (s->size == 0)
2914 {
2915 /* If we don't need this section, strip it from the
2916 output file. This is mostly to handle .rel.bss and
2917 .rel.plt. We must create both sections in
2918 create_dynamic_sections, because they must be created
2919 before the linker maps input sections to output
2920 sections. The linker does that before
2921 adjust_dynamic_symbol is called, and it is that
2922 function which decides whether anything needs to go
2923 into these sections. */
2924 if (strip_section)
2925 s->flags |= SEC_EXCLUDE;
2926 continue;
2927 }
2928
2929 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2930 continue;
2931
2932 /* Allocate memory for the section contents. We use bfd_zalloc
2933 here in case unused entries are not reclaimed before the
2934 section's contents are written out. This should not happen,
2935 but this way if it does, we get a R_386_NONE reloc instead
2936 of garbage. */
2937 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2938 if (s->contents == NULL)
2939 return FALSE;
2940 }
2941
2942 if (htab->plt_eh_frame != NULL
2943 && htab->plt_eh_frame->contents != NULL)
2944 {
2945 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2946 sizeof (elf_i386_eh_frame_plt));
2947 bfd_put_32 (dynobj, htab->elf.splt->size,
2948 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2949 }
2950
2951 if (htab->elf.dynamic_sections_created)
2952 {
2953 /* Add some entries to the .dynamic section. We fill in the
2954 values later, in elf_i386_finish_dynamic_sections, but we
2955 must add the entries now so that we get the correct size for
2956 the .dynamic section. The DT_DEBUG entry is filled in by the
2957 dynamic linker and used by the debugger. */
2958 #define add_dynamic_entry(TAG, VAL) \
2959 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2960
2961 if (info->executable)
2962 {
2963 if (!add_dynamic_entry (DT_DEBUG, 0))
2964 return FALSE;
2965 }
2966
2967 if (htab->elf.splt->size != 0)
2968 {
2969 if (!add_dynamic_entry (DT_PLTGOT, 0)
2970 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2971 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2972 || !add_dynamic_entry (DT_JMPREL, 0))
2973 return FALSE;
2974 }
2975
2976 if (relocs)
2977 {
2978 if (!add_dynamic_entry (DT_REL, 0)
2979 || !add_dynamic_entry (DT_RELSZ, 0)
2980 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2981 return FALSE;
2982
2983 /* If any dynamic relocs apply to a read-only section,
2984 then we need a DT_TEXTREL entry. */
2985 if ((info->flags & DF_TEXTREL) == 0)
2986 elf_link_hash_traverse (&htab->elf,
2987 elf_i386_readonly_dynrelocs, info);
2988
2989 if ((info->flags & DF_TEXTREL) != 0)
2990 {
2991 if (!add_dynamic_entry (DT_TEXTREL, 0))
2992 return FALSE;
2993 }
2994 }
2995 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2996 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2997 return FALSE;
2998 }
2999 #undef add_dynamic_entry
3000
3001 return TRUE;
3002 }
3003
3004 static bfd_boolean
3005 elf_i386_always_size_sections (bfd *output_bfd,
3006 struct bfd_link_info *info)
3007 {
3008 asection *tls_sec = elf_hash_table (info)->tls_sec;
3009
3010 if (tls_sec)
3011 {
3012 struct elf_link_hash_entry *tlsbase;
3013
3014 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3015 "_TLS_MODULE_BASE_",
3016 FALSE, FALSE, FALSE);
3017
3018 if (tlsbase && tlsbase->type == STT_TLS)
3019 {
3020 struct elf_i386_link_hash_table *htab;
3021 struct bfd_link_hash_entry *bh = NULL;
3022 const struct elf_backend_data *bed
3023 = get_elf_backend_data (output_bfd);
3024
3025 htab = elf_i386_hash_table (info);
3026 if (htab == NULL)
3027 return FALSE;
3028
3029 if (!(_bfd_generic_link_add_one_symbol
3030 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3031 tls_sec, 0, NULL, FALSE,
3032 bed->collect, &bh)))
3033 return FALSE;
3034
3035 htab->tls_module_base = bh;
3036
3037 tlsbase = (struct elf_link_hash_entry *)bh;
3038 tlsbase->def_regular = 1;
3039 tlsbase->other = STV_HIDDEN;
3040 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3041 }
3042 }
3043
3044 return TRUE;
3045 }
3046
3047 /* Set the correct type for an x86 ELF section. We do this by the
3048 section name, which is a hack, but ought to work. */
3049
3050 static bfd_boolean
3051 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3052 Elf_Internal_Shdr *hdr,
3053 asection *sec)
3054 {
3055 const char *name;
3056
3057 name = bfd_get_section_name (abfd, sec);
3058
3059 /* This is an ugly, but unfortunately necessary hack that is
3060 needed when producing EFI binaries on x86. It tells
3061 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3062 containing ELF relocation info. We need this hack in order to
3063 be able to generate ELF binaries that can be translated into
3064 EFI applications (which are essentially COFF objects). Those
3065 files contain a COFF ".reloc" section inside an ELFNN object,
3066 which would normally cause BFD to segfault because it would
3067 attempt to interpret this section as containing relocation
3068 entries for section "oc". With this hack enabled, ".reloc"
3069 will be treated as a normal data section, which will avoid the
3070 segfault. However, you won't be able to create an ELFNN binary
3071 with a section named "oc" that needs relocations, but that's
3072 the kind of ugly side-effects you get when detecting section
3073 types based on their names... In practice, this limitation is
3074 unlikely to bite. */
3075 if (strcmp (name, ".reloc") == 0)
3076 hdr->sh_type = SHT_PROGBITS;
3077
3078 return TRUE;
3079 }
3080
3081 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3082 executables. Rather than setting it to the beginning of the TLS
3083 section, we have to set it to the end. This function may be called
3084 multiple times, it is idempotent. */
3085
3086 static void
3087 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3088 {
3089 struct elf_i386_link_hash_table *htab;
3090 struct bfd_link_hash_entry *base;
3091
3092 if (!info->executable)
3093 return;
3094
3095 htab = elf_i386_hash_table (info);
3096 if (htab == NULL)
3097 return;
3098
3099 base = htab->tls_module_base;
3100 if (base == NULL)
3101 return;
3102
3103 base->u.def.value = htab->elf.tls_size;
3104 }
3105
3106 /* Return the base VMA address which should be subtracted from real addresses
3107 when resolving @dtpoff relocation.
3108 This is PT_TLS segment p_vaddr. */
3109
3110 static bfd_vma
3111 elf_i386_dtpoff_base (struct bfd_link_info *info)
3112 {
3113 /* If tls_sec is NULL, we should have signalled an error already. */
3114 if (elf_hash_table (info)->tls_sec == NULL)
3115 return 0;
3116 return elf_hash_table (info)->tls_sec->vma;
3117 }
3118
3119 /* Return the relocation value for @tpoff relocation
3120 if STT_TLS virtual address is ADDRESS. */
3121
3122 static bfd_vma
3123 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3124 {
3125 struct elf_link_hash_table *htab = elf_hash_table (info);
3126 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3127 bfd_vma static_tls_size;
3128
3129 /* If tls_sec is NULL, we should have signalled an error already. */
3130 if (htab->tls_sec == NULL)
3131 return 0;
3132
3133 /* Consider special static TLS alignment requirements. */
3134 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3135 return static_tls_size + htab->tls_sec->vma - address;
3136 }
3137
3138 /* Relocate an i386 ELF section. */
3139
3140 static bfd_boolean
3141 elf_i386_relocate_section (bfd *output_bfd,
3142 struct bfd_link_info *info,
3143 bfd *input_bfd,
3144 asection *input_section,
3145 bfd_byte *contents,
3146 Elf_Internal_Rela *relocs,
3147 Elf_Internal_Sym *local_syms,
3148 asection **local_sections)
3149 {
3150 struct elf_i386_link_hash_table *htab;
3151 Elf_Internal_Shdr *symtab_hdr;
3152 struct elf_link_hash_entry **sym_hashes;
3153 bfd_vma *local_got_offsets;
3154 bfd_vma *local_tlsdesc_gotents;
3155 Elf_Internal_Rela *rel;
3156 Elf_Internal_Rela *relend;
3157 bfd_boolean is_vxworks_tls;
3158 unsigned plt_entry_size;
3159
3160 BFD_ASSERT (is_i386_elf (input_bfd));
3161
3162 htab = elf_i386_hash_table (info);
3163 if (htab == NULL)
3164 return FALSE;
3165 symtab_hdr = &elf_symtab_hdr (input_bfd);
3166 sym_hashes = elf_sym_hashes (input_bfd);
3167 local_got_offsets = elf_local_got_offsets (input_bfd);
3168 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3169 /* We have to handle relocations in vxworks .tls_vars sections
3170 specially, because the dynamic loader is 'weird'. */
3171 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3172 && info->shared
3173 && !strcmp (input_section->output_section->name,
3174 ".tls_vars"));
3175
3176 elf_i386_set_tls_module_base (info);
3177
3178 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3179
3180 rel = relocs;
3181 relend = relocs + input_section->reloc_count;
3182 for (; rel < relend; rel++)
3183 {
3184 unsigned int r_type;
3185 reloc_howto_type *howto;
3186 unsigned long r_symndx;
3187 struct elf_link_hash_entry *h;
3188 Elf_Internal_Sym *sym;
3189 asection *sec;
3190 bfd_vma off, offplt;
3191 bfd_vma relocation;
3192 bfd_boolean unresolved_reloc;
3193 bfd_reloc_status_type r;
3194 unsigned int indx;
3195 int tls_type;
3196 bfd_vma st_size;
3197
3198 r_type = ELF32_R_TYPE (rel->r_info);
3199 if (r_type == R_386_GNU_VTINHERIT
3200 || r_type == R_386_GNU_VTENTRY)
3201 continue;
3202
3203 if ((indx = r_type) >= R_386_standard
3204 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3205 >= R_386_ext - R_386_standard)
3206 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3207 >= R_386_irelative - R_386_ext))
3208 {
3209 (*_bfd_error_handler)
3210 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3211 input_bfd, input_section, r_type);
3212 bfd_set_error (bfd_error_bad_value);
3213 return FALSE;
3214 }
3215 howto = elf_howto_table + indx;
3216
3217 r_symndx = ELF32_R_SYM (rel->r_info);
3218 h = NULL;
3219 sym = NULL;
3220 sec = NULL;
3221 unresolved_reloc = FALSE;
3222 if (r_symndx < symtab_hdr->sh_info)
3223 {
3224 sym = local_syms + r_symndx;
3225 sec = local_sections[r_symndx];
3226 relocation = (sec->output_section->vma
3227 + sec->output_offset
3228 + sym->st_value);
3229 st_size = sym->st_size;
3230
3231 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3232 && ((sec->flags & SEC_MERGE) != 0
3233 || (info->relocatable
3234 && sec->output_offset != 0)))
3235 {
3236 bfd_vma addend;
3237 bfd_byte *where = contents + rel->r_offset;
3238
3239 switch (howto->size)
3240 {
3241 case 0:
3242 addend = bfd_get_8 (input_bfd, where);
3243 if (howto->pc_relative)
3244 {
3245 addend = (addend ^ 0x80) - 0x80;
3246 addend += 1;
3247 }
3248 break;
3249 case 1:
3250 addend = bfd_get_16 (input_bfd, where);
3251 if (howto->pc_relative)
3252 {
3253 addend = (addend ^ 0x8000) - 0x8000;
3254 addend += 2;
3255 }
3256 break;
3257 case 2:
3258 addend = bfd_get_32 (input_bfd, where);
3259 if (howto->pc_relative)
3260 {
3261 addend = (addend ^ 0x80000000) - 0x80000000;
3262 addend += 4;
3263 }
3264 break;
3265 default:
3266 abort ();
3267 }
3268
3269 if (info->relocatable)
3270 addend += sec->output_offset;
3271 else
3272 {
3273 asection *msec = sec;
3274 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3275 addend);
3276 addend -= relocation;
3277 addend += msec->output_section->vma + msec->output_offset;
3278 }
3279
3280 switch (howto->size)
3281 {
3282 case 0:
3283 /* FIXME: overflow checks. */
3284 if (howto->pc_relative)
3285 addend -= 1;
3286 bfd_put_8 (input_bfd, addend, where);
3287 break;
3288 case 1:
3289 if (howto->pc_relative)
3290 addend -= 2;
3291 bfd_put_16 (input_bfd, addend, where);
3292 break;
3293 case 2:
3294 if (howto->pc_relative)
3295 addend -= 4;
3296 bfd_put_32 (input_bfd, addend, where);
3297 break;
3298 }
3299 }
3300 else if (!info->relocatable
3301 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3302 {
3303 /* Relocate against local STT_GNU_IFUNC symbol. */
3304 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3305 FALSE);
3306 if (h == NULL)
3307 abort ();
3308
3309 /* Set STT_GNU_IFUNC symbol value. */
3310 h->root.u.def.value = sym->st_value;
3311 h->root.u.def.section = sec;
3312 }
3313 }
3314 else
3315 {
3316 bfd_boolean warned ATTRIBUTE_UNUSED;
3317
3318 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3319 r_symndx, symtab_hdr, sym_hashes,
3320 h, sec, relocation,
3321 unresolved_reloc, warned);
3322 st_size = h->size;
3323 }
3324
3325 if (sec != NULL && discarded_section (sec))
3326 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3327 rel, 1, relend, howto, 0, contents);
3328
3329 if (info->relocatable)
3330 continue;
3331
3332 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3333 it here if it is defined in a non-shared object. */
3334 if (h != NULL
3335 && h->type == STT_GNU_IFUNC
3336 && h->def_regular)
3337 {
3338 asection *plt, *gotplt, *base_got;
3339 bfd_vma plt_index;
3340 const char *name;
3341
3342 if ((input_section->flags & SEC_ALLOC) == 0
3343 || h->plt.offset == (bfd_vma) -1)
3344 abort ();
3345
3346 /* STT_GNU_IFUNC symbol must go through PLT. */
3347 if (htab->elf.splt != NULL)
3348 {
3349 plt = htab->elf.splt;
3350 gotplt = htab->elf.sgotplt;
3351 }
3352 else
3353 {
3354 plt = htab->elf.iplt;
3355 gotplt = htab->elf.igotplt;
3356 }
3357
3358 relocation = (plt->output_section->vma
3359 + plt->output_offset + h->plt.offset);
3360
3361 switch (r_type)
3362 {
3363 default:
3364 if (h->root.root.string)
3365 name = h->root.root.string;
3366 else
3367 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3368 NULL);
3369 (*_bfd_error_handler)
3370 (_("%B: relocation %s against STT_GNU_IFUNC "
3371 "symbol `%s' isn't handled by %s"), input_bfd,
3372 elf_howto_table[r_type].name,
3373 name, __FUNCTION__);
3374 bfd_set_error (bfd_error_bad_value);
3375 return FALSE;
3376
3377 case R_386_32:
3378 /* Generate dynamic relcoation only when there is a
3379 non-GOT reference in a shared object. */
3380 if (info->shared && h->non_got_ref)
3381 {
3382 Elf_Internal_Rela outrel;
3383 asection *sreloc;
3384 bfd_vma offset;
3385
3386 /* Need a dynamic relocation to get the real function
3387 adddress. */
3388 offset = _bfd_elf_section_offset (output_bfd,
3389 info,
3390 input_section,
3391 rel->r_offset);
3392 if (offset == (bfd_vma) -1
3393 || offset == (bfd_vma) -2)
3394 abort ();
3395
3396 outrel.r_offset = (input_section->output_section->vma
3397 + input_section->output_offset
3398 + offset);
3399
3400 if (h->dynindx == -1
3401 || h->forced_local
3402 || info->executable)
3403 {
3404 /* This symbol is resolved locally. */
3405 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3406 bfd_put_32 (output_bfd,
3407 (h->root.u.def.value
3408 + h->root.u.def.section->output_section->vma
3409 + h->root.u.def.section->output_offset),
3410 contents + offset);
3411 }
3412 else
3413 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3414
3415 sreloc = htab->elf.irelifunc;
3416 elf_append_rel (output_bfd, sreloc, &outrel);
3417
3418 /* If this reloc is against an external symbol, we
3419 do not want to fiddle with the addend. Otherwise,
3420 we need to include the symbol value so that it
3421 becomes an addend for the dynamic reloc. For an
3422 internal symbol, we have updated addend. */
3423 continue;
3424 }
3425 /* FALLTHROUGH */
3426 case R_386_PC32:
3427 case R_386_PLT32:
3428 goto do_relocation;
3429
3430 case R_386_GOT32:
3431 base_got = htab->elf.sgot;
3432 off = h->got.offset;
3433
3434 if (base_got == NULL)
3435 abort ();
3436
3437 if (off == (bfd_vma) -1)
3438 {
3439 /* We can't use h->got.offset here to save state, or
3440 even just remember the offset, as finish_dynamic_symbol
3441 would use that as offset into .got. */
3442
3443 if (htab->elf.splt != NULL)
3444 {
3445 plt_index = h->plt.offset / plt_entry_size - 1;
3446 off = (plt_index + 3) * 4;
3447 base_got = htab->elf.sgotplt;
3448 }
3449 else
3450 {
3451 plt_index = h->plt.offset / plt_entry_size;
3452 off = plt_index * 4;
3453 base_got = htab->elf.igotplt;
3454 }
3455
3456 if (h->dynindx == -1
3457 || h->forced_local
3458 || info->symbolic)
3459 {
3460 /* This references the local defitionion. We must
3461 initialize this entry in the global offset table.
3462 Since the offset must always be a multiple of 8,
3463 we use the least significant bit to record
3464 whether we have initialized it already.
3465
3466 When doing a dynamic link, we create a .rela.got
3467 relocation entry to initialize the value. This
3468 is done in the finish_dynamic_symbol routine. */
3469 if ((off & 1) != 0)
3470 off &= ~1;
3471 else
3472 {
3473 bfd_put_32 (output_bfd, relocation,
3474 base_got->contents + off);
3475 h->got.offset |= 1;
3476 }
3477 }
3478
3479 relocation = off;
3480
3481 /* Adjust for static executables. */
3482 if (htab->elf.splt == NULL)
3483 relocation += gotplt->output_offset;
3484 }
3485 else
3486 {
3487 relocation = (base_got->output_section->vma
3488 + base_got->output_offset + off
3489 - gotplt->output_section->vma
3490 - gotplt->output_offset);
3491 /* Adjust for static executables. */
3492 if (htab->elf.splt == NULL)
3493 relocation += gotplt->output_offset;
3494 }
3495
3496 goto do_relocation;
3497
3498 case R_386_GOTOFF:
3499 relocation -= (gotplt->output_section->vma
3500 + gotplt->output_offset);
3501 goto do_relocation;
3502 }
3503 }
3504
3505 switch (r_type)
3506 {
3507 case R_386_GOT32:
3508 /* Relocation is to the entry for this symbol in the global
3509 offset table. */
3510 if (htab->elf.sgot == NULL)
3511 abort ();
3512
3513 if (h != NULL)
3514 {
3515 bfd_boolean dyn;
3516
3517 off = h->got.offset;
3518 dyn = htab->elf.dynamic_sections_created;
3519 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3520 || (info->shared
3521 && SYMBOL_REFERENCES_LOCAL (info, h))
3522 || (ELF_ST_VISIBILITY (h->other)
3523 && h->root.type == bfd_link_hash_undefweak))
3524 {
3525 /* This is actually a static link, or it is a
3526 -Bsymbolic link and the symbol is defined
3527 locally, or the symbol was forced to be local
3528 because of a version file. We must initialize
3529 this entry in the global offset table. Since the
3530 offset must always be a multiple of 4, we use the
3531 least significant bit to record whether we have
3532 initialized it already.
3533
3534 When doing a dynamic link, we create a .rel.got
3535 relocation entry to initialize the value. This
3536 is done in the finish_dynamic_symbol routine. */
3537 if ((off & 1) != 0)
3538 off &= ~1;
3539 else
3540 {
3541 bfd_put_32 (output_bfd, relocation,
3542 htab->elf.sgot->contents + off);
3543 h->got.offset |= 1;
3544 }
3545 }
3546 else
3547 unresolved_reloc = FALSE;
3548 }
3549 else
3550 {
3551 if (local_got_offsets == NULL)
3552 abort ();
3553
3554 off = local_got_offsets[r_symndx];
3555
3556 /* The offset must always be a multiple of 4. We use
3557 the least significant bit to record whether we have
3558 already generated the necessary reloc. */
3559 if ((off & 1) != 0)
3560 off &= ~1;
3561 else
3562 {
3563 bfd_put_32 (output_bfd, relocation,
3564 htab->elf.sgot->contents + off);
3565
3566 if (info->shared)
3567 {
3568 asection *s;
3569 Elf_Internal_Rela outrel;
3570
3571 s = htab->elf.srelgot;
3572 if (s == NULL)
3573 abort ();
3574
3575 outrel.r_offset = (htab->elf.sgot->output_section->vma
3576 + htab->elf.sgot->output_offset
3577 + off);
3578 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3579 elf_append_rel (output_bfd, s, &outrel);
3580 }
3581
3582 local_got_offsets[r_symndx] |= 1;
3583 }
3584 }
3585
3586 if (off >= (bfd_vma) -2)
3587 abort ();
3588
3589 relocation = htab->elf.sgot->output_section->vma
3590 + htab->elf.sgot->output_offset + off
3591 - htab->elf.sgotplt->output_section->vma
3592 - htab->elf.sgotplt->output_offset;
3593 break;
3594
3595 case R_386_GOTOFF:
3596 /* Relocation is relative to the start of the global offset
3597 table. */
3598
3599 /* Check to make sure it isn't a protected function symbol
3600 for shared library since it may not be local when used
3601 as function address. We also need to make sure that a
3602 symbol is defined locally. */
3603 if (info->shared && h)
3604 {
3605 if (!h->def_regular)
3606 {
3607 const char *v;
3608
3609 switch (ELF_ST_VISIBILITY (h->other))
3610 {
3611 case STV_HIDDEN:
3612 v = _("hidden symbol");
3613 break;
3614 case STV_INTERNAL:
3615 v = _("internal symbol");
3616 break;
3617 case STV_PROTECTED:
3618 v = _("protected symbol");
3619 break;
3620 default:
3621 v = _("symbol");
3622 break;
3623 }
3624
3625 (*_bfd_error_handler)
3626 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3627 input_bfd, v, h->root.root.string);
3628 bfd_set_error (bfd_error_bad_value);
3629 return FALSE;
3630 }
3631 else if (!info->executable
3632 && !SYMBOLIC_BIND (info, h)
3633 && h->type == STT_FUNC
3634 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3635 {
3636 (*_bfd_error_handler)
3637 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3638 input_bfd, h->root.root.string);
3639 bfd_set_error (bfd_error_bad_value);
3640 return FALSE;
3641 }
3642 }
3643
3644 /* Note that sgot is not involved in this
3645 calculation. We always want the start of .got.plt. If we
3646 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3647 permitted by the ABI, we might have to change this
3648 calculation. */
3649 relocation -= htab->elf.sgotplt->output_section->vma
3650 + htab->elf.sgotplt->output_offset;
3651 break;
3652
3653 case R_386_GOTPC:
3654 /* Use global offset table as symbol value. */
3655 relocation = htab->elf.sgotplt->output_section->vma
3656 + htab->elf.sgotplt->output_offset;
3657 unresolved_reloc = FALSE;
3658 break;
3659
3660 case R_386_PLT32:
3661 /* Relocation is to the entry for this symbol in the
3662 procedure linkage table. */
3663
3664 /* Resolve a PLT32 reloc against a local symbol directly,
3665 without using the procedure linkage table. */
3666 if (h == NULL)
3667 break;
3668
3669 if (h->plt.offset == (bfd_vma) -1
3670 || htab->elf.splt == NULL)
3671 {
3672 /* We didn't make a PLT entry for this symbol. This
3673 happens when statically linking PIC code, or when
3674 using -Bsymbolic. */
3675 break;
3676 }
3677
3678 relocation = (htab->elf.splt->output_section->vma
3679 + htab->elf.splt->output_offset
3680 + h->plt.offset);
3681 unresolved_reloc = FALSE;
3682 break;
3683
3684 case R_386_SIZE32:
3685 if (h
3686 && h->type == STT_TLS
3687 && (h->root.type == bfd_link_hash_defined
3688 || h->root.type == bfd_link_hash_defweak)
3689 && h->root.u.def.section->output_section != NULL
3690 && htab->elf.tls_sec == NULL)
3691 {
3692 (*_bfd_error_handler)
3693 (_("%B: `%s' accessed both as normal and thread local symbol"),
3694 input_bfd, h->root.root.string);
3695 bfd_set_error (bfd_error_bad_value);
3696 return FALSE;
3697 }
3698
3699 /* Set to symbol size. */
3700 relocation = st_size;
3701 /* Fall through. */
3702
3703 case R_386_32:
3704 case R_386_PC32:
3705 if ((input_section->flags & SEC_ALLOC) == 0
3706 || is_vxworks_tls)
3707 break;
3708
3709 if ((info->shared
3710 && (h == NULL
3711 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3712 || h->root.type != bfd_link_hash_undefweak)
3713 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3714 || !SYMBOL_CALLS_LOCAL (info, h)))
3715 || (ELIMINATE_COPY_RELOCS
3716 && !info->shared
3717 && h != NULL
3718 && h->dynindx != -1
3719 && !h->non_got_ref
3720 && ((h->def_dynamic
3721 && !h->def_regular)
3722 || h->root.type == bfd_link_hash_undefweak
3723 || h->root.type == bfd_link_hash_undefined)))
3724 {
3725 Elf_Internal_Rela outrel;
3726 bfd_boolean skip, relocate;
3727 asection *sreloc;
3728
3729 /* When generating a shared object, these relocations
3730 are copied into the output file to be resolved at run
3731 time. */
3732
3733 skip = FALSE;
3734 relocate = FALSE;
3735
3736 outrel.r_offset =
3737 _bfd_elf_section_offset (output_bfd, info, input_section,
3738 rel->r_offset);
3739 if (outrel.r_offset == (bfd_vma) -1)
3740 skip = TRUE;
3741 else if (outrel.r_offset == (bfd_vma) -2)
3742 skip = TRUE, relocate = TRUE;
3743 outrel.r_offset += (input_section->output_section->vma
3744 + input_section->output_offset);
3745
3746 if (skip)
3747 memset (&outrel, 0, sizeof outrel);
3748 else if (h != NULL
3749 && h->dynindx != -1
3750 && (r_type == R_386_PC32
3751 || !info->shared
3752 || !SYMBOLIC_BIND (info, h)
3753 || !h->def_regular))
3754 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3755 else
3756 {
3757 /* This symbol is local, or marked to become local. */
3758 relocate = TRUE;
3759 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3760 }
3761
3762 sreloc = elf_section_data (input_section)->sreloc;
3763
3764 if (sreloc == NULL || sreloc->contents == NULL)
3765 {
3766 r = bfd_reloc_notsupported;
3767 goto check_relocation_error;
3768 }
3769
3770 elf_append_rel (output_bfd, sreloc, &outrel);
3771
3772 /* If this reloc is against an external symbol, we do
3773 not want to fiddle with the addend. Otherwise, we
3774 need to include the symbol value so that it becomes
3775 an addend for the dynamic reloc. */
3776 if (! relocate)
3777 continue;
3778 }
3779 break;
3780
3781 case R_386_TLS_IE:
3782 if (!info->executable)
3783 {
3784 Elf_Internal_Rela outrel;
3785 asection *sreloc;
3786
3787 outrel.r_offset = rel->r_offset
3788 + input_section->output_section->vma
3789 + input_section->output_offset;
3790 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3791 sreloc = elf_section_data (input_section)->sreloc;
3792 if (sreloc == NULL)
3793 abort ();
3794 elf_append_rel (output_bfd, sreloc, &outrel);
3795 }
3796 /* Fall through */
3797
3798 case R_386_TLS_GD:
3799 case R_386_TLS_GOTDESC:
3800 case R_386_TLS_DESC_CALL:
3801 case R_386_TLS_IE_32:
3802 case R_386_TLS_GOTIE:
3803 tls_type = GOT_UNKNOWN;
3804 if (h == NULL && local_got_offsets)
3805 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3806 else if (h != NULL)
3807 tls_type = elf_i386_hash_entry(h)->tls_type;
3808 if (tls_type == GOT_TLS_IE)
3809 tls_type = GOT_TLS_IE_NEG;
3810
3811 if (! elf_i386_tls_transition (info, input_bfd,
3812 input_section, contents,
3813 symtab_hdr, sym_hashes,
3814 &r_type, tls_type, rel,
3815 relend, h, r_symndx))
3816 return FALSE;
3817
3818 if (r_type == R_386_TLS_LE_32)
3819 {
3820 BFD_ASSERT (! unresolved_reloc);
3821 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3822 {
3823 unsigned int type;
3824 bfd_vma roff;
3825
3826 /* GD->LE transition. */
3827 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3828 if (type == 0x04)
3829 {
3830 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3831 Change it into:
3832 movl %gs:0, %eax; subl $foo@tpoff, %eax
3833 (6 byte form of subl). */
3834 memcpy (contents + rel->r_offset - 3,
3835 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3836 roff = rel->r_offset + 5;
3837 }
3838 else
3839 {
3840 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3841 Change it into:
3842 movl %gs:0, %eax; subl $foo@tpoff, %eax
3843 (6 byte form of subl). */
3844 memcpy (contents + rel->r_offset - 2,
3845 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3846 roff = rel->r_offset + 6;
3847 }
3848 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3849 contents + roff);
3850 /* Skip R_386_PC32/R_386_PLT32. */
3851 rel++;
3852 continue;
3853 }
3854 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3855 {
3856 /* GDesc -> LE transition.
3857 It's originally something like:
3858 leal x@tlsdesc(%ebx), %eax
3859
3860 leal x@ntpoff, %eax
3861
3862 Registers other than %eax may be set up here. */
3863
3864 unsigned int val;
3865 bfd_vma roff;
3866
3867 roff = rel->r_offset;
3868 val = bfd_get_8 (input_bfd, contents + roff - 1);
3869
3870 /* Now modify the instruction as appropriate. */
3871 /* aoliva FIXME: remove the above and xor the byte
3872 below with 0x86. */
3873 bfd_put_8 (output_bfd, val ^ 0x86,
3874 contents + roff - 1);
3875 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3876 contents + roff);
3877 continue;
3878 }
3879 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3880 {
3881 /* GDesc -> LE transition.
3882 It's originally:
3883 call *(%eax)
3884 Turn it into:
3885 xchg %ax,%ax */
3886
3887 bfd_vma roff;
3888
3889 roff = rel->r_offset;
3890 bfd_put_8 (output_bfd, 0x66, contents + roff);
3891 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3892 continue;
3893 }
3894 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3895 {
3896 unsigned int val;
3897
3898 /* IE->LE transition:
3899 Originally it can be one of:
3900 movl foo, %eax
3901 movl foo, %reg
3902 addl foo, %reg
3903 We change it into:
3904 movl $foo, %eax
3905 movl $foo, %reg
3906 addl $foo, %reg. */
3907 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3908 if (val == 0xa1)
3909 {
3910 /* movl foo, %eax. */
3911 bfd_put_8 (output_bfd, 0xb8,
3912 contents + rel->r_offset - 1);
3913 }
3914 else
3915 {
3916 unsigned int type;
3917
3918 type = bfd_get_8 (input_bfd,
3919 contents + rel->r_offset - 2);
3920 switch (type)
3921 {
3922 case 0x8b:
3923 /* movl */
3924 bfd_put_8 (output_bfd, 0xc7,
3925 contents + rel->r_offset - 2);
3926 bfd_put_8 (output_bfd,
3927 0xc0 | ((val >> 3) & 7),
3928 contents + rel->r_offset - 1);
3929 break;
3930 case 0x03:
3931 /* addl */
3932 bfd_put_8 (output_bfd, 0x81,
3933 contents + rel->r_offset - 2);
3934 bfd_put_8 (output_bfd,
3935 0xc0 | ((val >> 3) & 7),
3936 contents + rel->r_offset - 1);
3937 break;
3938 default:
3939 BFD_FAIL ();
3940 break;
3941 }
3942 }
3943 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3944 contents + rel->r_offset);
3945 continue;
3946 }
3947 else
3948 {
3949 unsigned int val, type;
3950
3951 /* {IE_32,GOTIE}->LE transition:
3952 Originally it can be one of:
3953 subl foo(%reg1), %reg2
3954 movl foo(%reg1), %reg2
3955 addl foo(%reg1), %reg2
3956 We change it into:
3957 subl $foo, %reg2
3958 movl $foo, %reg2 (6 byte form)
3959 addl $foo, %reg2. */
3960 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3961 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3962 if (type == 0x8b)
3963 {
3964 /* movl */
3965 bfd_put_8 (output_bfd, 0xc7,
3966 contents + rel->r_offset - 2);
3967 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3968 contents + rel->r_offset - 1);
3969 }
3970 else if (type == 0x2b)
3971 {
3972 /* subl */
3973 bfd_put_8 (output_bfd, 0x81,
3974 contents + rel->r_offset - 2);
3975 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3976 contents + rel->r_offset - 1);
3977 }
3978 else if (type == 0x03)
3979 {
3980 /* addl */
3981 bfd_put_8 (output_bfd, 0x81,
3982 contents + rel->r_offset - 2);
3983 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3984 contents + rel->r_offset - 1);
3985 }
3986 else
3987 BFD_FAIL ();
3988 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3989 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3990 contents + rel->r_offset);
3991 else
3992 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3993 contents + rel->r_offset);
3994 continue;
3995 }
3996 }
3997
3998 if (htab->elf.sgot == NULL)
3999 abort ();
4000
4001 if (h != NULL)
4002 {
4003 off = h->got.offset;
4004 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4005 }
4006 else
4007 {
4008 if (local_got_offsets == NULL)
4009 abort ();
4010
4011 off = local_got_offsets[r_symndx];
4012 offplt = local_tlsdesc_gotents[r_symndx];
4013 }
4014
4015 if ((off & 1) != 0)
4016 off &= ~1;
4017 else
4018 {
4019 Elf_Internal_Rela outrel;
4020 int dr_type;
4021 asection *sreloc;
4022
4023 if (htab->elf.srelgot == NULL)
4024 abort ();
4025
4026 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4027
4028 if (GOT_TLS_GDESC_P (tls_type))
4029 {
4030 bfd_byte *loc;
4031 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4032 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4033 <= htab->elf.sgotplt->size);
4034 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4035 + htab->elf.sgotplt->output_offset
4036 + offplt
4037 + htab->sgotplt_jump_table_size);
4038 sreloc = htab->elf.srelplt;
4039 loc = sreloc->contents;
4040 loc += (htab->next_tls_desc_index++
4041 * sizeof (Elf32_External_Rel));
4042 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4043 <= sreloc->contents + sreloc->size);
4044 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4045 if (indx == 0)
4046 {
4047 BFD_ASSERT (! unresolved_reloc);
4048 bfd_put_32 (output_bfd,
4049 relocation - elf_i386_dtpoff_base (info),
4050 htab->elf.sgotplt->contents + offplt
4051 + htab->sgotplt_jump_table_size + 4);
4052 }
4053 else
4054 {
4055 bfd_put_32 (output_bfd, 0,
4056 htab->elf.sgotplt->contents + offplt
4057 + htab->sgotplt_jump_table_size + 4);
4058 }
4059 }
4060
4061 sreloc = htab->elf.srelgot;
4062
4063 outrel.r_offset = (htab->elf.sgot->output_section->vma
4064 + htab->elf.sgot->output_offset + off);
4065
4066 if (GOT_TLS_GD_P (tls_type))
4067 dr_type = R_386_TLS_DTPMOD32;
4068 else if (GOT_TLS_GDESC_P (tls_type))
4069 goto dr_done;
4070 else if (tls_type == GOT_TLS_IE_POS)
4071 dr_type = R_386_TLS_TPOFF;
4072 else
4073 dr_type = R_386_TLS_TPOFF32;
4074
4075 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4076 bfd_put_32 (output_bfd,
4077 relocation - elf_i386_dtpoff_base (info),
4078 htab->elf.sgot->contents + off);
4079 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4080 bfd_put_32 (output_bfd,
4081 elf_i386_dtpoff_base (info) - relocation,
4082 htab->elf.sgot->contents + off);
4083 else if (dr_type != R_386_TLS_DESC)
4084 bfd_put_32 (output_bfd, 0,
4085 htab->elf.sgot->contents + off);
4086 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4087
4088 elf_append_rel (output_bfd, sreloc, &outrel);
4089
4090 if (GOT_TLS_GD_P (tls_type))
4091 {
4092 if (indx == 0)
4093 {
4094 BFD_ASSERT (! unresolved_reloc);
4095 bfd_put_32 (output_bfd,
4096 relocation - elf_i386_dtpoff_base (info),
4097 htab->elf.sgot->contents + off + 4);
4098 }
4099 else
4100 {
4101 bfd_put_32 (output_bfd, 0,
4102 htab->elf.sgot->contents + off + 4);
4103 outrel.r_info = ELF32_R_INFO (indx,
4104 R_386_TLS_DTPOFF32);
4105 outrel.r_offset += 4;
4106 elf_append_rel (output_bfd, sreloc, &outrel);
4107 }
4108 }
4109 else if (tls_type == GOT_TLS_IE_BOTH)
4110 {
4111 bfd_put_32 (output_bfd,
4112 (indx == 0
4113 ? relocation - elf_i386_dtpoff_base (info)
4114 : 0),
4115 htab->elf.sgot->contents + off + 4);
4116 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4117 outrel.r_offset += 4;
4118 elf_append_rel (output_bfd, sreloc, &outrel);
4119 }
4120
4121 dr_done:
4122 if (h != NULL)
4123 h->got.offset |= 1;
4124 else
4125 local_got_offsets[r_symndx] |= 1;
4126 }
4127
4128 if (off >= (bfd_vma) -2
4129 && ! GOT_TLS_GDESC_P (tls_type))
4130 abort ();
4131 if (r_type == R_386_TLS_GOTDESC
4132 || r_type == R_386_TLS_DESC_CALL)
4133 {
4134 relocation = htab->sgotplt_jump_table_size + offplt;
4135 unresolved_reloc = FALSE;
4136 }
4137 else if (r_type == ELF32_R_TYPE (rel->r_info))
4138 {
4139 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4140 + htab->elf.sgotplt->output_offset;
4141 relocation = htab->elf.sgot->output_section->vma
4142 + htab->elf.sgot->output_offset + off - g_o_t;
4143 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4144 && tls_type == GOT_TLS_IE_BOTH)
4145 relocation += 4;
4146 if (r_type == R_386_TLS_IE)
4147 relocation += g_o_t;
4148 unresolved_reloc = FALSE;
4149 }
4150 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4151 {
4152 unsigned int val, type;
4153 bfd_vma roff;
4154
4155 /* GD->IE transition. */
4156 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4157 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4158 if (type == 0x04)
4159 {
4160 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4161 Change it into:
4162 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4163 val >>= 3;
4164 roff = rel->r_offset - 3;
4165 }
4166 else
4167 {
4168 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4169 Change it into:
4170 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4171 roff = rel->r_offset - 2;
4172 }
4173 memcpy (contents + roff,
4174 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4175 contents[roff + 7] = 0x80 | (val & 7);
4176 /* If foo is used only with foo@gotntpoff(%reg) and
4177 foo@indntpoff, but not with foo@gottpoff(%reg), change
4178 subl $foo@gottpoff(%reg), %eax
4179 into:
4180 addl $foo@gotntpoff(%reg), %eax. */
4181 if (tls_type == GOT_TLS_IE_POS)
4182 contents[roff + 6] = 0x03;
4183 bfd_put_32 (output_bfd,
4184 htab->elf.sgot->output_section->vma
4185 + htab->elf.sgot->output_offset + off
4186 - htab->elf.sgotplt->output_section->vma
4187 - htab->elf.sgotplt->output_offset,
4188 contents + roff + 8);
4189 /* Skip R_386_PLT32. */
4190 rel++;
4191 continue;
4192 }
4193 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4194 {
4195 /* GDesc -> IE transition.
4196 It's originally something like:
4197 leal x@tlsdesc(%ebx), %eax
4198
4199 Change it to:
4200 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4201 or:
4202 movl x@gottpoff(%ebx), %eax # before negl %eax
4203
4204 Registers other than %eax may be set up here. */
4205
4206 bfd_vma roff;
4207
4208 /* First, make sure it's a leal adding ebx to a 32-bit
4209 offset into any register, although it's probably
4210 almost always going to be eax. */
4211 roff = rel->r_offset;
4212
4213 /* Now modify the instruction as appropriate. */
4214 /* To turn a leal into a movl in the form we use it, it
4215 suffices to change the first byte from 0x8d to 0x8b.
4216 aoliva FIXME: should we decide to keep the leal, all
4217 we have to do is remove the statement below, and
4218 adjust the relaxation of R_386_TLS_DESC_CALL. */
4219 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4220
4221 if (tls_type == GOT_TLS_IE_BOTH)
4222 off += 4;
4223
4224 bfd_put_32 (output_bfd,
4225 htab->elf.sgot->output_section->vma
4226 + htab->elf.sgot->output_offset + off
4227 - htab->elf.sgotplt->output_section->vma
4228 - htab->elf.sgotplt->output_offset,
4229 contents + roff);
4230 continue;
4231 }
4232 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4233 {
4234 /* GDesc -> IE transition.
4235 It's originally:
4236 call *(%eax)
4237
4238 Change it to:
4239 xchg %ax,%ax
4240 or
4241 negl %eax
4242 depending on how we transformed the TLS_GOTDESC above.
4243 */
4244
4245 bfd_vma roff;
4246
4247 roff = rel->r_offset;
4248
4249 /* Now modify the instruction as appropriate. */
4250 if (tls_type != GOT_TLS_IE_NEG)
4251 {
4252 /* xchg %ax,%ax */
4253 bfd_put_8 (output_bfd, 0x66, contents + roff);
4254 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4255 }
4256 else
4257 {
4258 /* negl %eax */
4259 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4260 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4261 }
4262
4263 continue;
4264 }
4265 else
4266 BFD_ASSERT (FALSE);
4267 break;
4268
4269 case R_386_TLS_LDM:
4270 if (! elf_i386_tls_transition (info, input_bfd,
4271 input_section, contents,
4272 symtab_hdr, sym_hashes,
4273 &r_type, GOT_UNKNOWN, rel,
4274 relend, h, r_symndx))
4275 return FALSE;
4276
4277 if (r_type != R_386_TLS_LDM)
4278 {
4279 /* LD->LE transition:
4280 leal foo(%reg), %eax; call ___tls_get_addr.
4281 We change it into:
4282 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4283 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4284 memcpy (contents + rel->r_offset - 2,
4285 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4286 /* Skip R_386_PC32/R_386_PLT32. */
4287 rel++;
4288 continue;
4289 }
4290
4291 if (htab->elf.sgot == NULL)
4292 abort ();
4293
4294 off = htab->tls_ldm_got.offset;
4295 if (off & 1)
4296 off &= ~1;
4297 else
4298 {
4299 Elf_Internal_Rela outrel;
4300
4301 if (htab->elf.srelgot == NULL)
4302 abort ();
4303
4304 outrel.r_offset = (htab->elf.sgot->output_section->vma
4305 + htab->elf.sgot->output_offset + off);
4306
4307 bfd_put_32 (output_bfd, 0,
4308 htab->elf.sgot->contents + off);
4309 bfd_put_32 (output_bfd, 0,
4310 htab->elf.sgot->contents + off + 4);
4311 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4312 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4313 htab->tls_ldm_got.offset |= 1;
4314 }
4315 relocation = htab->elf.sgot->output_section->vma
4316 + htab->elf.sgot->output_offset + off
4317 - htab->elf.sgotplt->output_section->vma
4318 - htab->elf.sgotplt->output_offset;
4319 unresolved_reloc = FALSE;
4320 break;
4321
4322 case R_386_TLS_LDO_32:
4323 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4324 relocation -= elf_i386_dtpoff_base (info);
4325 else
4326 /* When converting LDO to LE, we must negate. */
4327 relocation = -elf_i386_tpoff (info, relocation);
4328 break;
4329
4330 case R_386_TLS_LE_32:
4331 case R_386_TLS_LE:
4332 if (!info->executable)
4333 {
4334 Elf_Internal_Rela outrel;
4335 asection *sreloc;
4336
4337 outrel.r_offset = rel->r_offset
4338 + input_section->output_section->vma
4339 + input_section->output_offset;
4340 if (h != NULL && h->dynindx != -1)
4341 indx = h->dynindx;
4342 else
4343 indx = 0;
4344 if (r_type == R_386_TLS_LE_32)
4345 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4346 else
4347 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4348 sreloc = elf_section_data (input_section)->sreloc;
4349 if (sreloc == NULL)
4350 abort ();
4351 elf_append_rel (output_bfd, sreloc, &outrel);
4352 if (indx)
4353 continue;
4354 else if (r_type == R_386_TLS_LE_32)
4355 relocation = elf_i386_dtpoff_base (info) - relocation;
4356 else
4357 relocation -= elf_i386_dtpoff_base (info);
4358 }
4359 else if (r_type == R_386_TLS_LE_32)
4360 relocation = elf_i386_tpoff (info, relocation);
4361 else
4362 relocation = -elf_i386_tpoff (info, relocation);
4363 break;
4364
4365 default:
4366 break;
4367 }
4368
4369 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4370 because such sections are not SEC_ALLOC and thus ld.so will
4371 not process them. */
4372 if (unresolved_reloc
4373 && !((input_section->flags & SEC_DEBUGGING) != 0
4374 && h->def_dynamic)
4375 && _bfd_elf_section_offset (output_bfd, info, input_section,
4376 rel->r_offset) != (bfd_vma) -1)
4377 {
4378 (*_bfd_error_handler)
4379 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4380 input_bfd,
4381 input_section,
4382 (long) rel->r_offset,
4383 howto->name,
4384 h->root.root.string);
4385 return FALSE;
4386 }
4387
4388 do_relocation:
4389 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4390 contents, rel->r_offset,
4391 relocation, 0);
4392
4393 check_relocation_error:
4394 if (r != bfd_reloc_ok)
4395 {
4396 const char *name;
4397
4398 if (h != NULL)
4399 name = h->root.root.string;
4400 else
4401 {
4402 name = bfd_elf_string_from_elf_section (input_bfd,
4403 symtab_hdr->sh_link,
4404 sym->st_name);
4405 if (name == NULL)
4406 return FALSE;
4407 if (*name == '\0')
4408 name = bfd_section_name (input_bfd, sec);
4409 }
4410
4411 if (r == bfd_reloc_overflow)
4412 {
4413 if (! ((*info->callbacks->reloc_overflow)
4414 (info, (h ? &h->root : NULL), name, howto->name,
4415 (bfd_vma) 0, input_bfd, input_section,
4416 rel->r_offset)))
4417 return FALSE;
4418 }
4419 else
4420 {
4421 (*_bfd_error_handler)
4422 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4423 input_bfd, input_section,
4424 (long) rel->r_offset, name, (int) r);
4425 return FALSE;
4426 }
4427 }
4428 }
4429
4430 return TRUE;
4431 }
4432
4433 /* Finish up dynamic symbol handling. We set the contents of various
4434 dynamic sections here. */
4435
4436 static bfd_boolean
4437 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4438 struct bfd_link_info *info,
4439 struct elf_link_hash_entry *h,
4440 Elf_Internal_Sym *sym)
4441 {
4442 struct elf_i386_link_hash_table *htab;
4443 unsigned plt_entry_size;
4444 const struct elf_i386_backend_data *abed;
4445
4446 htab = elf_i386_hash_table (info);
4447 if (htab == NULL)
4448 return FALSE;
4449
4450 abed = get_elf_i386_backend_data (output_bfd);
4451 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4452
4453 if (h->plt.offset != (bfd_vma) -1)
4454 {
4455 bfd_vma plt_index;
4456 bfd_vma got_offset;
4457 Elf_Internal_Rela rel;
4458 bfd_byte *loc;
4459 asection *plt, *gotplt, *relplt;
4460
4461 /* When building a static executable, use .iplt, .igot.plt and
4462 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4463 if (htab->elf.splt != NULL)
4464 {
4465 plt = htab->elf.splt;
4466 gotplt = htab->elf.sgotplt;
4467 relplt = htab->elf.srelplt;
4468 }
4469 else
4470 {
4471 plt = htab->elf.iplt;
4472 gotplt = htab->elf.igotplt;
4473 relplt = htab->elf.irelplt;
4474 }
4475
4476 /* This symbol has an entry in the procedure linkage table. Set
4477 it up. */
4478
4479 if ((h->dynindx == -1
4480 && !((h->forced_local || info->executable)
4481 && h->def_regular
4482 && h->type == STT_GNU_IFUNC))
4483 || plt == NULL
4484 || gotplt == NULL
4485 || relplt == NULL)
4486 abort ();
4487
4488 /* Get the index in the procedure linkage table which
4489 corresponds to this symbol. This is the index of this symbol
4490 in all the symbols for which we are making plt entries. The
4491 first entry in the procedure linkage table is reserved.
4492
4493 Get the offset into the .got table of the entry that
4494 corresponds to this function. Each .got entry is 4 bytes.
4495 The first three are reserved.
4496
4497 For static executables, we don't reserve anything. */
4498
4499 if (plt == htab->elf.splt)
4500 {
4501 got_offset = h->plt.offset / plt_entry_size - 1;
4502 got_offset = (got_offset + 3) * 4;
4503 }
4504 else
4505 {
4506 got_offset = h->plt.offset / plt_entry_size;
4507 got_offset = got_offset * 4;
4508 }
4509
4510 /* Fill in the entry in the procedure linkage table. */
4511 if (! info->shared)
4512 {
4513 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4514 abed->plt->plt_entry_size);
4515 bfd_put_32 (output_bfd,
4516 (gotplt->output_section->vma
4517 + gotplt->output_offset
4518 + got_offset),
4519 plt->contents + h->plt.offset
4520 + abed->plt->plt_got_offset);
4521
4522 if (abed->is_vxworks)
4523 {
4524 int s, k, reloc_index;
4525
4526 /* Create the R_386_32 relocation referencing the GOT
4527 for this PLT entry. */
4528
4529 /* S: Current slot number (zero-based). */
4530 s = ((h->plt.offset - abed->plt->plt_entry_size)
4531 / abed->plt->plt_entry_size);
4532 /* K: Number of relocations for PLTResolve. */
4533 if (info->shared)
4534 k = PLTRESOLVE_RELOCS_SHLIB;
4535 else
4536 k = PLTRESOLVE_RELOCS;
4537 /* Skip the PLTresolve relocations, and the relocations for
4538 the other PLT slots. */
4539 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4540 loc = (htab->srelplt2->contents + reloc_index
4541 * sizeof (Elf32_External_Rel));
4542
4543 rel.r_offset = (htab->elf.splt->output_section->vma
4544 + htab->elf.splt->output_offset
4545 + h->plt.offset + 2),
4546 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4547 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4548
4549 /* Create the R_386_32 relocation referencing the beginning of
4550 the PLT for this GOT entry. */
4551 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4552 + htab->elf.sgotplt->output_offset
4553 + got_offset);
4554 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4555 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4556 loc + sizeof (Elf32_External_Rel));
4557 }
4558 }
4559 else
4560 {
4561 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4562 abed->plt->plt_entry_size);
4563 bfd_put_32 (output_bfd, got_offset,
4564 plt->contents + h->plt.offset
4565 + abed->plt->plt_got_offset);
4566 }
4567
4568 /* Fill in the entry in the global offset table. */
4569 bfd_put_32 (output_bfd,
4570 (plt->output_section->vma
4571 + plt->output_offset
4572 + h->plt.offset
4573 + abed->plt->plt_lazy_offset),
4574 gotplt->contents + got_offset);
4575
4576 /* Fill in the entry in the .rel.plt section. */
4577 rel.r_offset = (gotplt->output_section->vma
4578 + gotplt->output_offset
4579 + got_offset);
4580 if (h->dynindx == -1
4581 || ((info->executable
4582 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4583 && h->def_regular
4584 && h->type == STT_GNU_IFUNC))
4585 {
4586 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4587 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4588 in the .got.plt section. */
4589 bfd_put_32 (output_bfd,
4590 (h->root.u.def.value
4591 + h->root.u.def.section->output_section->vma
4592 + h->root.u.def.section->output_offset),
4593 gotplt->contents + got_offset);
4594 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4595 /* R_386_IRELATIVE comes last. */
4596 plt_index = htab->next_irelative_index--;
4597 }
4598 else
4599 {
4600 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4601 plt_index = htab->next_jump_slot_index++;
4602 }
4603 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4604 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4605
4606 /* Don't fill PLT entry for static executables. */
4607 if (plt == htab->elf.splt)
4608 {
4609 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4610 plt->contents + h->plt.offset
4611 + abed->plt->plt_reloc_offset);
4612 bfd_put_32 (output_bfd, - (h->plt.offset
4613 + abed->plt->plt_plt_offset + 4),
4614 plt->contents + h->plt.offset
4615 + abed->plt->plt_plt_offset);
4616 }
4617
4618 if (!h->def_regular)
4619 {
4620 /* Mark the symbol as undefined, rather than as defined in
4621 the .plt section. Leave the value if there were any
4622 relocations where pointer equality matters (this is a clue
4623 for the dynamic linker, to make function pointer
4624 comparisons work between an application and shared
4625 library), otherwise set it to zero. If a function is only
4626 called from a binary, there is no need to slow down
4627 shared libraries because of that. */
4628 sym->st_shndx = SHN_UNDEF;
4629 if (!h->pointer_equality_needed)
4630 sym->st_value = 0;
4631 }
4632 }
4633
4634 if (h->got.offset != (bfd_vma) -1
4635 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4636 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4637 {
4638 Elf_Internal_Rela rel;
4639
4640 /* This symbol has an entry in the global offset table. Set it
4641 up. */
4642
4643 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4644 abort ();
4645
4646 rel.r_offset = (htab->elf.sgot->output_section->vma
4647 + htab->elf.sgot->output_offset
4648 + (h->got.offset & ~(bfd_vma) 1));
4649
4650 /* If this is a static link, or it is a -Bsymbolic link and the
4651 symbol is defined locally or was forced to be local because
4652 of a version file, we just want to emit a RELATIVE reloc.
4653 The entry in the global offset table will already have been
4654 initialized in the relocate_section function. */
4655 if (h->def_regular
4656 && h->type == STT_GNU_IFUNC)
4657 {
4658 if (info->shared)
4659 {
4660 /* Generate R_386_GLOB_DAT. */
4661 goto do_glob_dat;
4662 }
4663 else
4664 {
4665 asection *plt;
4666
4667 if (!h->pointer_equality_needed)
4668 abort ();
4669
4670 /* For non-shared object, we can't use .got.plt, which
4671 contains the real function addres if we need pointer
4672 equality. We load the GOT entry with the PLT entry. */
4673 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4674 bfd_put_32 (output_bfd,
4675 (plt->output_section->vma
4676 + plt->output_offset + h->plt.offset),
4677 htab->elf.sgot->contents + h->got.offset);
4678 return TRUE;
4679 }
4680 }
4681 else if (info->shared
4682 && SYMBOL_REFERENCES_LOCAL (info, h))
4683 {
4684 BFD_ASSERT((h->got.offset & 1) != 0);
4685 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4686 }
4687 else
4688 {
4689 BFD_ASSERT((h->got.offset & 1) == 0);
4690 do_glob_dat:
4691 bfd_put_32 (output_bfd, (bfd_vma) 0,
4692 htab->elf.sgot->contents + h->got.offset);
4693 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4694 }
4695
4696 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4697 }
4698
4699 if (h->needs_copy)
4700 {
4701 Elf_Internal_Rela rel;
4702
4703 /* This symbol needs a copy reloc. Set it up. */
4704
4705 if (h->dynindx == -1
4706 || (h->root.type != bfd_link_hash_defined
4707 && h->root.type != bfd_link_hash_defweak)
4708 || htab->srelbss == NULL)
4709 abort ();
4710
4711 rel.r_offset = (h->root.u.def.value
4712 + h->root.u.def.section->output_section->vma
4713 + h->root.u.def.section->output_offset);
4714 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4715 elf_append_rel (output_bfd, htab->srelbss, &rel);
4716 }
4717
4718 return TRUE;
4719 }
4720
4721 /* Finish up local dynamic symbol handling. We set the contents of
4722 various dynamic sections here. */
4723
4724 static bfd_boolean
4725 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4726 {
4727 struct elf_link_hash_entry *h
4728 = (struct elf_link_hash_entry *) *slot;
4729 struct bfd_link_info *info
4730 = (struct bfd_link_info *) inf;
4731
4732 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4733 h, NULL);
4734 }
4735
4736 /* Used to decide how to sort relocs in an optimal manner for the
4737 dynamic linker, before writing them out. */
4738
4739 static enum elf_reloc_type_class
4740 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4741 {
4742 switch (ELF32_R_TYPE (rela->r_info))
4743 {
4744 case R_386_RELATIVE:
4745 return reloc_class_relative;
4746 case R_386_JUMP_SLOT:
4747 return reloc_class_plt;
4748 case R_386_COPY:
4749 return reloc_class_copy;
4750 default:
4751 return reloc_class_normal;
4752 }
4753 }
4754
4755 /* Finish up the dynamic sections. */
4756
4757 static bfd_boolean
4758 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4759 struct bfd_link_info *info)
4760 {
4761 struct elf_i386_link_hash_table *htab;
4762 bfd *dynobj;
4763 asection *sdyn;
4764 const struct elf_i386_backend_data *abed;
4765
4766 htab = elf_i386_hash_table (info);
4767 if (htab == NULL)
4768 return FALSE;
4769
4770 dynobj = htab->elf.dynobj;
4771 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4772 abed = get_elf_i386_backend_data (output_bfd);
4773
4774 if (htab->elf.dynamic_sections_created)
4775 {
4776 Elf32_External_Dyn *dyncon, *dynconend;
4777
4778 if (sdyn == NULL || htab->elf.sgot == NULL)
4779 abort ();
4780
4781 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4782 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4783 for (; dyncon < dynconend; dyncon++)
4784 {
4785 Elf_Internal_Dyn dyn;
4786 asection *s;
4787
4788 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4789
4790 switch (dyn.d_tag)
4791 {
4792 default:
4793 if (abed->is_vxworks
4794 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4795 break;
4796 continue;
4797
4798 case DT_PLTGOT:
4799 s = htab->elf.sgotplt;
4800 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4801 break;
4802
4803 case DT_JMPREL:
4804 s = htab->elf.srelplt;
4805 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4806 break;
4807
4808 case DT_PLTRELSZ:
4809 s = htab->elf.srelplt;
4810 dyn.d_un.d_val = s->size;
4811 break;
4812
4813 case DT_RELSZ:
4814 /* My reading of the SVR4 ABI indicates that the
4815 procedure linkage table relocs (DT_JMPREL) should be
4816 included in the overall relocs (DT_REL). This is
4817 what Solaris does. However, UnixWare can not handle
4818 that case. Therefore, we override the DT_RELSZ entry
4819 here to make it not include the JMPREL relocs. */
4820 s = htab->elf.srelplt;
4821 if (s == NULL)
4822 continue;
4823 dyn.d_un.d_val -= s->size;
4824 break;
4825
4826 case DT_REL:
4827 /* We may not be using the standard ELF linker script.
4828 If .rel.plt is the first .rel section, we adjust
4829 DT_REL to not include it. */
4830 s = htab->elf.srelplt;
4831 if (s == NULL)
4832 continue;
4833 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4834 continue;
4835 dyn.d_un.d_ptr += s->size;
4836 break;
4837 }
4838
4839 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4840 }
4841
4842 /* Fill in the first entry in the procedure linkage table. */
4843 if (htab->elf.splt && htab->elf.splt->size > 0)
4844 {
4845 if (info->shared)
4846 {
4847 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4848 abed->plt->plt0_entry_size);
4849 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4850 abed->plt0_pad_byte,
4851 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4852 }
4853 else
4854 {
4855 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4856 abed->plt->plt0_entry_size);
4857 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4858 abed->plt0_pad_byte,
4859 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4860 bfd_put_32 (output_bfd,
4861 (htab->elf.sgotplt->output_section->vma
4862 + htab->elf.sgotplt->output_offset
4863 + 4),
4864 htab->elf.splt->contents
4865 + abed->plt->plt0_got1_offset);
4866 bfd_put_32 (output_bfd,
4867 (htab->elf.sgotplt->output_section->vma
4868 + htab->elf.sgotplt->output_offset
4869 + 8),
4870 htab->elf.splt->contents
4871 + abed->plt->plt0_got2_offset);
4872
4873 if (abed->is_vxworks)
4874 {
4875 Elf_Internal_Rela rel;
4876
4877 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4878 On IA32 we use REL relocations so the addend goes in
4879 the PLT directly. */
4880 rel.r_offset = (htab->elf.splt->output_section->vma
4881 + htab->elf.splt->output_offset
4882 + abed->plt->plt0_got1_offset);
4883 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4884 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4885 htab->srelplt2->contents);
4886 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4887 rel.r_offset = (htab->elf.splt->output_section->vma
4888 + htab->elf.splt->output_offset
4889 + abed->plt->plt0_got2_offset);
4890 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4891 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4892 htab->srelplt2->contents +
4893 sizeof (Elf32_External_Rel));
4894 }
4895 }
4896
4897 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4898 really seem like the right value. */
4899 elf_section_data (htab->elf.splt->output_section)
4900 ->this_hdr.sh_entsize = 4;
4901
4902 /* Correct the .rel.plt.unloaded relocations. */
4903 if (abed->is_vxworks && !info->shared)
4904 {
4905 int num_plts = (htab->elf.splt->size
4906 / abed->plt->plt_entry_size) - 1;
4907 unsigned char *p;
4908
4909 p = htab->srelplt2->contents;
4910 if (info->shared)
4911 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4912 else
4913 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4914
4915 for (; num_plts; num_plts--)
4916 {
4917 Elf_Internal_Rela rel;
4918 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4919 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4920 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4921 p += sizeof (Elf32_External_Rel);
4922
4923 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4924 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4925 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4926 p += sizeof (Elf32_External_Rel);
4927 }
4928 }
4929 }
4930 }
4931
4932 if (htab->elf.sgotplt)
4933 {
4934 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4935 {
4936 (*_bfd_error_handler)
4937 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4938 return FALSE;
4939 }
4940
4941 /* Fill in the first three entries in the global offset table. */
4942 if (htab->elf.sgotplt->size > 0)
4943 {
4944 bfd_put_32 (output_bfd,
4945 (sdyn == NULL ? 0
4946 : sdyn->output_section->vma + sdyn->output_offset),
4947 htab->elf.sgotplt->contents);
4948 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4949 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4950 }
4951
4952 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4953 }
4954
4955 /* Adjust .eh_frame for .plt section. */
4956 if (htab->plt_eh_frame != NULL
4957 && htab->plt_eh_frame->contents != NULL)
4958 {
4959 if (htab->elf.splt != NULL
4960 && htab->elf.splt->size != 0
4961 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4962 && htab->elf.splt->output_section != NULL
4963 && htab->plt_eh_frame->output_section != NULL)
4964 {
4965 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4966 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4967 + htab->plt_eh_frame->output_offset
4968 + PLT_FDE_START_OFFSET;
4969 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4970 htab->plt_eh_frame->contents
4971 + PLT_FDE_START_OFFSET);
4972 }
4973 if (htab->plt_eh_frame->sec_info_type
4974 == SEC_INFO_TYPE_EH_FRAME)
4975 {
4976 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4977 htab->plt_eh_frame,
4978 htab->plt_eh_frame->contents))
4979 return FALSE;
4980 }
4981 }
4982
4983 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4984 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4985
4986 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4987 htab_traverse (htab->loc_hash_table,
4988 elf_i386_finish_local_dynamic_symbol,
4989 info);
4990
4991 return TRUE;
4992 }
4993
4994 /* Return address for Ith PLT stub in section PLT, for relocation REL
4995 or (bfd_vma) -1 if it should not be included. */
4996
4997 static bfd_vma
4998 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4999 const arelent *rel ATTRIBUTE_UNUSED)
5000 {
5001 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5002 }
5003
5004 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5005
5006 static bfd_boolean
5007 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5008 {
5009 if (h->plt.offset != (bfd_vma) -1
5010 && !h->def_regular
5011 && !h->pointer_equality_needed)
5012 return FALSE;
5013
5014 return _bfd_elf_hash_symbol (h);
5015 }
5016
5017 /* Hook called by the linker routine which adds symbols from an object
5018 file. */
5019
5020 static bfd_boolean
5021 elf_i386_add_symbol_hook (bfd * abfd,
5022 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5023 Elf_Internal_Sym * sym,
5024 const char ** namep ATTRIBUTE_UNUSED,
5025 flagword * flagsp ATTRIBUTE_UNUSED,
5026 asection ** secp ATTRIBUTE_UNUSED,
5027 bfd_vma * valp ATTRIBUTE_UNUSED)
5028 {
5029 if ((abfd->flags & DYNAMIC) == 0
5030 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5031 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5032 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5033
5034 return TRUE;
5035 }
5036
5037 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5038 #define TARGET_LITTLE_NAME "elf32-i386"
5039 #define ELF_ARCH bfd_arch_i386
5040 #define ELF_TARGET_ID I386_ELF_DATA
5041 #define ELF_MACHINE_CODE EM_386
5042 #define ELF_MAXPAGESIZE 0x1000
5043
5044 #define elf_backend_can_gc_sections 1
5045 #define elf_backend_can_refcount 1
5046 #define elf_backend_want_got_plt 1
5047 #define elf_backend_plt_readonly 1
5048 #define elf_backend_want_plt_sym 0
5049 #define elf_backend_got_header_size 12
5050 #define elf_backend_plt_alignment 4
5051
5052 /* Support RELA for objdump of prelink objects. */
5053 #define elf_info_to_howto elf_i386_info_to_howto_rel
5054 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5055
5056 #define bfd_elf32_mkobject elf_i386_mkobject
5057
5058 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5059 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5060 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5061 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5062 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5063
5064 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5065 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5066 #define elf_backend_check_relocs elf_i386_check_relocs
5067 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5068 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5069 #define elf_backend_fake_sections elf_i386_fake_sections
5070 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5071 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5072 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5073 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5074 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5075 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5076 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5077 #define elf_backend_relocate_section elf_i386_relocate_section
5078 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5079 #define elf_backend_always_size_sections elf_i386_always_size_sections
5080 #define elf_backend_omit_section_dynsym \
5081 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5082 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5083 #define elf_backend_hash_symbol elf_i386_hash_symbol
5084 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5085 #undef elf_backend_post_process_headers
5086 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5087
5088 #include "elf32-target.h"
5089
5090 /* FreeBSD support. */
5091
5092 #undef TARGET_LITTLE_SYM
5093 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5094 #undef TARGET_LITTLE_NAME
5095 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5096 #undef ELF_OSABI
5097 #define ELF_OSABI ELFOSABI_FREEBSD
5098
5099 /* The kernel recognizes executables as valid only if they carry a
5100 "FreeBSD" label in the ELF header. So we put this label on all
5101 executables and (for simplicity) also all other object files. */
5102
5103 static void
5104 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5105 {
5106 _bfd_elf_set_osabi (abfd, info);
5107
5108 #ifdef OLD_FREEBSD_ABI_LABEL
5109 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5110 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5111 #endif
5112 }
5113
5114 #undef elf_backend_post_process_headers
5115 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5116 #undef elf32_bed
5117 #define elf32_bed elf32_i386_fbsd_bed
5118
5119 #undef elf_backend_add_symbol_hook
5120
5121 #include "elf32-target.h"
5122
5123 /* Solaris 2. */
5124
5125 #undef TARGET_LITTLE_SYM
5126 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5127 #undef TARGET_LITTLE_NAME
5128 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5129
5130 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5131 objects won't be recognized. */
5132 #undef ELF_OSABI
5133
5134 #undef elf32_bed
5135 #define elf32_bed elf32_i386_sol2_bed
5136
5137 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5138 boundary. */
5139 #undef elf_backend_static_tls_alignment
5140 #define elf_backend_static_tls_alignment 8
5141
5142 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5143
5144 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5145 File, p.63. */
5146 #undef elf_backend_want_plt_sym
5147 #define elf_backend_want_plt_sym 1
5148
5149 #include "elf32-target.h"
5150
5151 /* Native Client support. */
5152
5153 #undef TARGET_LITTLE_SYM
5154 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5155 #undef TARGET_LITTLE_NAME
5156 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5157 #undef elf32_bed
5158 #define elf32_bed elf32_i386_nacl_bed
5159
5160 #undef ELF_MAXPAGESIZE
5161 #define ELF_MAXPAGESIZE 0x10000
5162
5163 /* Restore defaults. */
5164 #undef ELF_OSABI
5165 #undef elf_backend_want_plt_sym
5166 #define elf_backend_want_plt_sym 0
5167 #undef elf_backend_post_process_headers
5168 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5169 #undef elf_backend_static_tls_alignment
5170
5171 /* NaCl uses substantially different PLT entries for the same effects. */
5172
5173 #undef elf_backend_plt_alignment
5174 #define elf_backend_plt_alignment 5
5175 #define NACL_PLT_ENTRY_SIZE 64
5176 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5177
5178 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5179 {
5180 0xff, 0x35, /* pushl contents of address */
5181 0, 0, 0, 0, /* replaced with address of .got + 4. */
5182 0x8b, 0x0d, /* movl contents of address, %ecx */
5183 0, 0, 0, 0, /* replaced with address of .got + 8. */
5184 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5185 0xff, 0xe1 /* jmp *%ecx */
5186 };
5187
5188 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5189 {
5190 0x8b, 0x0d, /* movl contents of address, %ecx */
5191 0, 0, 0, 0, /* replaced with GOT slot address. */
5192 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5193 0xff, 0xe1, /* jmp *%ecx */
5194
5195 /* Pad to the next 32-byte boundary with nop instructions. */
5196 0x90,
5197 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5198 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5199
5200 /* Lazy GOT entries point here (32-byte aligned). */
5201 0x68, /* pushl immediate */
5202 0, 0, 0, 0, /* replaced with reloc offset. */
5203 0xe9, /* jmp relative */
5204 0, 0, 0, 0, /* replaced with offset to .plt. */
5205
5206 /* Pad to the next 32-byte boundary with nop instructions. */
5207 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5208 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5209 0x90, 0x90
5210 };
5211
5212 static const bfd_byte
5213 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5214 {
5215 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5216 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5217 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5218 0xff, 0xe1, /* jmp *%ecx */
5219
5220 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5221 so pad to that size with nop instructions. */
5222 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5223 };
5224
5225 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5226 {
5227 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5228 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5229 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5230 0xff, 0xe1, /* jmp *%ecx */
5231
5232 /* Pad to the next 32-byte boundary with nop instructions. */
5233 0x90,
5234 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5235 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5236
5237 /* Lazy GOT entries point here (32-byte aligned). */
5238 0x68, /* pushl immediate */
5239 0, 0, 0, 0, /* replaced with offset into relocation table. */
5240 0xe9, /* jmp relative */
5241 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5242
5243 /* Pad to the next 32-byte boundary with nop instructions. */
5244 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5245 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5246 0x90, 0x90
5247 };
5248
5249 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5250 {
5251 #if (PLT_CIE_LENGTH != 20 \
5252 || PLT_FDE_LENGTH != 36 \
5253 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5254 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5255 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5256 #endif
5257 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5258 0, 0, 0, 0, /* CIE ID */
5259 1, /* CIE version */
5260 'z', 'R', 0, /* Augmentation string */
5261 1, /* Code alignment factor */
5262 0x7c, /* Data alignment factor: -4 */
5263 8, /* Return address column */
5264 1, /* Augmentation size */
5265 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5266 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5267 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5268 DW_CFA_nop, DW_CFA_nop,
5269
5270 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5271 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5272 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5273 0, 0, 0, 0, /* .plt size goes here */
5274 0, /* Augmentation size */
5275 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5276 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5277 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5278 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5279 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5280 13, /* Block length */
5281 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5282 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5283 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5284 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5285 DW_CFA_nop, DW_CFA_nop
5286 };
5287
5288 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5289 {
5290 elf_i386_nacl_plt0_entry, /* plt0_entry */
5291 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5292 2, /* plt0_got1_offset */
5293 8, /* plt0_got2_offset */
5294 elf_i386_nacl_plt_entry, /* plt_entry */
5295 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5296 2, /* plt_got_offset */
5297 33, /* plt_reloc_offset */
5298 38, /* plt_plt_offset */
5299 32, /* plt_lazy_offset */
5300 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5301 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5302 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5303 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5304 };
5305
5306 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5307 {
5308 &elf_i386_nacl_plt, /* plt */
5309 0x90, /* plt0_pad_byte: nop insn */
5310 0, /* is_vxworks */
5311 };
5312
5313 #undef elf_backend_arch_data
5314 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5315
5316 #undef elf_backend_modify_segment_map
5317 #define elf_backend_modify_segment_map nacl_modify_segment_map
5318 #undef elf_backend_modify_program_headers
5319 #define elf_backend_modify_program_headers nacl_modify_program_headers
5320
5321 #include "elf32-target.h"
5322
5323 /* Restore defaults. */
5324 #undef elf_backend_modify_segment_map
5325 #undef elf_backend_modify_program_headers
5326
5327 /* VxWorks support. */
5328
5329 #undef TARGET_LITTLE_SYM
5330 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5331 #undef TARGET_LITTLE_NAME
5332 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5333 #undef ELF_OSABI
5334 #undef elf_backend_plt_alignment
5335 #define elf_backend_plt_alignment 4
5336
5337 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5338 {
5339 &elf_i386_plt, /* plt */
5340 0x90, /* plt0_pad_byte */
5341 1, /* is_vxworks */
5342 };
5343
5344 #undef elf_backend_arch_data
5345 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5346
5347 #undef elf_backend_relocs_compatible
5348 #undef elf_backend_post_process_headers
5349 #undef elf_backend_add_symbol_hook
5350 #define elf_backend_add_symbol_hook \
5351 elf_vxworks_add_symbol_hook
5352 #undef elf_backend_link_output_symbol_hook
5353 #define elf_backend_link_output_symbol_hook \
5354 elf_vxworks_link_output_symbol_hook
5355 #undef elf_backend_emit_relocs
5356 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5357 #undef elf_backend_final_write_processing
5358 #define elf_backend_final_write_processing \
5359 elf_vxworks_final_write_processing
5360 #undef elf_backend_static_tls_alignment
5361
5362 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5363 define it. */
5364 #undef elf_backend_want_plt_sym
5365 #define elf_backend_want_plt_sym 1
5366
5367 #undef elf32_bed
5368 #define elf32_bed elf32_i386_vxworks_bed
5369
5370 #include "elf32-target.h"
GDB Binutils - Deliverables
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