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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf-nacl.h"
29 #include "elf-vxworks.h"
30 #include "bfd_stdint.h"
31 #include "objalloc.h"
32 #include "hashtab.h"
33 #include "dwarf2.h"
34
35 /* 386 uses REL relocations instead of RELA. */
36 #define USE_REL 1
37
38 #include "elf/i386.h"
39
40 static reloc_howto_type elf_howto_table[]=
41 {
42 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_NONE",
44 TRUE, 0x00000000, 0x00000000, FALSE),
45 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_32",
47 TRUE, 0xffffffff, 0xffffffff, FALSE),
48 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_PC32",
50 TRUE, 0xffffffff, 0xffffffff, TRUE),
51 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_GOT32",
53 TRUE, 0xffffffff, 0xffffffff, FALSE),
54 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_PLT32",
56 TRUE, 0xffffffff, 0xffffffff, TRUE),
57 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_COPY",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_RELATIVE",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTOFF",
71 TRUE, 0xffffffff, 0xffffffff, FALSE),
72 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_386_GOTPC",
74 TRUE, 0xffffffff, 0xffffffff, TRUE),
75
76 /* We have a gap in the reloc numbers here.
77 R_386_standard counts the number up to this point, and
78 R_386_ext_offset is the value to subtract from a reloc type of
79 R_386_16 thru R_386_PC8 to form an index into this table. */
80 #define R_386_standard (R_386_GOTPC + 1)
81 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82
83 /* These relocs are a GNU extension. */
84 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_IE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_LE",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_GD",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_TLS_LDM",
101 TRUE, 0xffffffff, 0xffffffff, FALSE),
102 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_16",
104 TRUE, 0xffff, 0xffff, FALSE),
105 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_PC16",
107 TRUE, 0xffff, 0xffff, TRUE),
108 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_386_8",
110 TRUE, 0xff, 0xff, FALSE),
111 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_386_PC8",
113 TRUE, 0xff, 0xff, TRUE),
114
115 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
116 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
117 /* These are common with Solaris TLS implementation. */
118 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
135 TRUE, 0xffffffff, 0xffffffff, FALSE),
136 EMPTY_HOWTO (38),
137 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
142 FALSE, 0, 0, FALSE),
143 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_TLS_DESC",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
147 bfd_elf_generic_reloc, "R_386_IRELATIVE",
148 TRUE, 0xffffffff, 0xffffffff, FALSE),
149
150 /* Another gap. */
151 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
152 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
153
154 /* GNU extension to record C++ vtable hierarchy. */
155 HOWTO (R_386_GNU_VTINHERIT, /* type */
156 0, /* rightshift */
157 2, /* size (0 = byte, 1 = short, 2 = long) */
158 0, /* bitsize */
159 FALSE, /* pc_relative */
160 0, /* bitpos */
161 complain_overflow_dont, /* complain_on_overflow */
162 NULL, /* special_function */
163 "R_386_GNU_VTINHERIT", /* name */
164 FALSE, /* partial_inplace */
165 0, /* src_mask */
166 0, /* dst_mask */
167 FALSE), /* pcrel_offset */
168
169 /* GNU extension to record C++ vtable member usage. */
170 HOWTO (R_386_GNU_VTENTRY, /* type */
171 0, /* rightshift */
172 2, /* size (0 = byte, 1 = short, 2 = long) */
173 0, /* bitsize */
174 FALSE, /* pc_relative */
175 0, /* bitpos */
176 complain_overflow_dont, /* complain_on_overflow */
177 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
178 "R_386_GNU_VTENTRY", /* name */
179 FALSE, /* partial_inplace */
180 0, /* src_mask */
181 0, /* dst_mask */
182 FALSE) /* pcrel_offset */
183
184 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185
186 };
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_GOTDESC:
316 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
317 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_DESC_CALL:
320 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
321 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC:
324 TRACE ("BFD_RELOC_386_TLS_DESC");
325 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_IRELATIVE:
328 TRACE ("BFD_RELOC_386_IRELATIVE");
329 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
330
331 case BFD_RELOC_VTABLE_INHERIT:
332 TRACE ("BFD_RELOC_VTABLE_INHERIT");
333 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
334
335 case BFD_RELOC_VTABLE_ENTRY:
336 TRACE ("BFD_RELOC_VTABLE_ENTRY");
337 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
338
339 default:
340 break;
341 }
342
343 TRACE ("Unknown");
344 return 0;
345 }
346
347 static reloc_howto_type *
348 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
349 const char *r_name)
350 {
351 unsigned int i;
352
353 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
354 if (elf_howto_table[i].name != NULL
355 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
356 return &elf_howto_table[i];
357
358 return NULL;
359 }
360
361 static reloc_howto_type *
362 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
363 {
364 unsigned int indx;
365
366 if ((indx = r_type) >= R_386_standard
367 && ((indx = r_type - R_386_ext_offset) - R_386_standard
368 >= R_386_ext - R_386_standard)
369 && ((indx = r_type - R_386_tls_offset) - R_386_ext
370 >= R_386_irelative - R_386_ext)
371 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
372 >= R_386_vt - R_386_irelative))
373 {
374 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
375 abfd, (int) r_type);
376 indx = R_386_NONE;
377 }
378 BFD_ASSERT (elf_howto_table [indx].type == r_type);
379 return &elf_howto_table[indx];
380 }
381
382 static void
383 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
384 arelent *cache_ptr,
385 Elf_Internal_Rela *dst)
386 {
387 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
388 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
389 }
390
391 /* Return whether a symbol name implies a local label. The UnixWare
392 2.1 cc generates temporary symbols that start with .X, so we
393 recognize them here. FIXME: do other SVR4 compilers also use .X?.
394 If so, we should move the .X recognition into
395 _bfd_elf_is_local_label_name. */
396
397 static bfd_boolean
398 elf_i386_is_local_label_name (bfd *abfd, const char *name)
399 {
400 if (name[0] == '.' && name[1] == 'X')
401 return TRUE;
402
403 return _bfd_elf_is_local_label_name (abfd, name);
404 }
405 \f
406 /* Support for core dump NOTE sections. */
407
408 static bfd_boolean
409 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
410 {
411 int offset;
412 size_t size;
413
414 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
415 {
416 int pr_version = bfd_get_32 (abfd, note->descdata);
417
418 if (pr_version != 1)
419 return FALSE;
420
421 /* pr_cursig */
422 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
423
424 /* pr_pid */
425 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
426
427 /* pr_reg */
428 offset = 28;
429 size = bfd_get_32 (abfd, note->descdata + 8);
430 }
431 else
432 {
433 switch (note->descsz)
434 {
435 default:
436 return FALSE;
437
438 case 144: /* Linux/i386 */
439 /* pr_cursig */
440 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
441
442 /* pr_pid */
443 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
444
445 /* pr_reg */
446 offset = 72;
447 size = 68;
448
449 break;
450 }
451 }
452
453 /* Make a ".reg/999" section. */
454 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
455 size, note->descpos + offset);
456 }
457
458 static bfd_boolean
459 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
460 {
461 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
462 {
463 int pr_version = bfd_get_32 (abfd, note->descdata);
464
465 if (pr_version != 1)
466 return FALSE;
467
468 elf_tdata (abfd)->core_program
469 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
470 elf_tdata (abfd)->core_command
471 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
472 }
473 else
474 {
475 switch (note->descsz)
476 {
477 default:
478 return FALSE;
479
480 case 124: /* Linux/i386 elf_prpsinfo. */
481 elf_tdata (abfd)->core_pid
482 = bfd_get_32 (abfd, note->descdata + 12);
483 elf_tdata (abfd)->core_program
484 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
485 elf_tdata (abfd)->core_command
486 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
487 }
488 }
489
490 /* Note that for some reason, a spurious space is tacked
491 onto the end of the args in some (at least one anyway)
492 implementations, so strip it off if it exists. */
493 {
494 char *command = elf_tdata (abfd)->core_command;
495 int n = strlen (command);
496
497 if (0 < n && command[n - 1] == ' ')
498 command[n - 1] = '\0';
499 }
500
501 return TRUE;
502 }
503 \f
504 /* Functions for the i386 ELF linker.
505
506 In order to gain some understanding of code in this file without
507 knowing all the intricate details of the linker, note the
508 following:
509
510 Functions named elf_i386_* are called by external routines, other
511 functions are only called locally. elf_i386_* functions appear
512 in this file more or less in the order in which they are called
513 from external routines. eg. elf_i386_check_relocs is called
514 early in the link process, elf_i386_finish_dynamic_sections is
515 one of the last functions. */
516
517
518 /* The name of the dynamic interpreter. This is put in the .interp
519 section. */
520
521 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
522
523 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
524 copying dynamic variables from a shared lib into an app's dynbss
525 section, and instead use a dynamic relocation to point into the
526 shared lib. */
527 #define ELIMINATE_COPY_RELOCS 1
528
529 /* The size in bytes of an entry in the procedure linkage table. */
530
531 #define PLT_ENTRY_SIZE 16
532
533 /* The first entry in an absolute procedure linkage table looks like
534 this. See the SVR4 ABI i386 supplement to see how this works.
535 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
536
537 static const bfd_byte elf_i386_plt0_entry[12] =
538 {
539 0xff, 0x35, /* pushl contents of address */
540 0, 0, 0, 0, /* replaced with address of .got + 4. */
541 0xff, 0x25, /* jmp indirect */
542 0, 0, 0, 0 /* replaced with address of .got + 8. */
543 };
544
545 /* Subsequent entries in an absolute procedure linkage table look like
546 this. */
547
548 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
549 {
550 0xff, 0x25, /* jmp indirect */
551 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
552 0x68, /* pushl immediate */
553 0, 0, 0, 0, /* replaced with offset into relocation table. */
554 0xe9, /* jmp relative */
555 0, 0, 0, 0 /* replaced with offset to start of .plt. */
556 };
557
558 /* The first entry in a PIC procedure linkage table look like this.
559 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
560
561 static const bfd_byte elf_i386_pic_plt0_entry[12] =
562 {
563 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
564 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
565 };
566
567 /* Subsequent entries in a PIC procedure linkage table look like this. */
568
569 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
570 {
571 0xff, 0xa3, /* jmp *offset(%ebx) */
572 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
573 0x68, /* pushl immediate */
574 0, 0, 0, 0, /* replaced with offset into relocation table. */
575 0xe9, /* jmp relative */
576 0, 0, 0, 0 /* replaced with offset to start of .plt. */
577 };
578
579 /* .eh_frame covering the .plt section. */
580
581 static const bfd_byte elf_i386_eh_frame_plt[] =
582 {
583 #define PLT_CIE_LENGTH 20
584 #define PLT_FDE_LENGTH 36
585 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
586 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
587 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
588 0, 0, 0, 0, /* CIE ID */
589 1, /* CIE version */
590 'z', 'R', 0, /* Augmentation string */
591 1, /* Code alignment factor */
592 0x7c, /* Data alignment factor */
593 8, /* Return address column */
594 1, /* Augmentation size */
595 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
596 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
597 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
598 DW_CFA_nop, DW_CFA_nop,
599
600 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
601 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
602 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
603 0, 0, 0, 0, /* .plt size goes here */
604 0, /* Augmentation size */
605 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
606 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
607 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
608 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
609 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
610 11, /* Block length */
611 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
612 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
613 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
614 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
615 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
616 };
617
618 struct elf_i386_plt_layout
619 {
620 /* The first entry in an absolute procedure linkage table looks like this. */
621 const bfd_byte *plt0_entry;
622 unsigned int plt0_entry_size;
623
624 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
625 unsigned int plt0_got1_offset;
626 unsigned int plt0_got2_offset;
627
628 /* Later entries in an absolute procedure linkage table look like this. */
629 const bfd_byte *plt_entry;
630 unsigned int plt_entry_size;
631
632 /* Offsets into plt_entry that are to be replaced with... */
633 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
634 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
635 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
636
637 /* Offset into plt_entry where the initial value of the GOT entry points. */
638 unsigned int plt_lazy_offset;
639
640 /* The first entry in a PIC procedure linkage table looks like this. */
641 const bfd_byte *pic_plt0_entry;
642
643 /* Subsequent entries in a PIC procedure linkage table look like this. */
644 const bfd_byte *pic_plt_entry;
645
646 /* .eh_frame covering the .plt section. */
647 const bfd_byte *eh_frame_plt;
648 unsigned int eh_frame_plt_size;
649 };
650
651 #define GET_PLT_ENTRY_SIZE(abfd) \
652 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
653
654 /* These are the standard parameters. */
655 static const struct elf_i386_plt_layout elf_i386_plt =
656 {
657 elf_i386_plt0_entry, /* plt0_entry */
658 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
659 2, /* plt0_got1_offset */
660 8, /* plt0_got2_offset */
661 elf_i386_plt_entry, /* plt_entry */
662 PLT_ENTRY_SIZE, /* plt_entry_size */
663 2, /* plt_got_offset */
664 7, /* plt_reloc_offset */
665 12, /* plt_plt_offset */
666 6, /* plt_lazy_offset */
667 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
668 elf_i386_pic_plt_entry, /* pic_plt_entry */
669 elf_i386_eh_frame_plt, /* eh_frame_plt */
670 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
671 };
672 \f
673
674 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
675 for the PLTResolve stub and then for each PLT entry. */
676 #define PLTRESOLVE_RELOCS_SHLIB 0
677 #define PLTRESOLVE_RELOCS 2
678 #define PLT_NON_JUMP_SLOT_RELOCS 2
679
680 /* Architecture-specific backend data for i386. */
681
682 struct elf_i386_backend_data
683 {
684 /* Parameters describing PLT generation. */
685 const struct elf_i386_plt_layout *plt;
686
687 /* Value used to fill the unused bytes of the first PLT entry. */
688 bfd_byte plt0_pad_byte;
689
690 /* True if the target system is VxWorks. */
691 int is_vxworks;
692 };
693
694 #define get_elf_i386_backend_data(abfd) \
695 ((const struct elf_i386_backend_data *) \
696 get_elf_backend_data (abfd)->arch_data)
697
698 /* These are the standard parameters. */
699 static const struct elf_i386_backend_data elf_i386_arch_bed =
700 {
701 &elf_i386_plt, /* plt */
702 0, /* plt0_pad_byte */
703 0, /* is_vxworks */
704 };
705
706 #define elf_backend_arch_data &elf_i386_arch_bed
707
708 /* i386 ELF linker hash entry. */
709
710 struct elf_i386_link_hash_entry
711 {
712 struct elf_link_hash_entry elf;
713
714 /* Track dynamic relocs copied for this symbol. */
715 struct elf_dyn_relocs *dyn_relocs;
716
717 #define GOT_UNKNOWN 0
718 #define GOT_NORMAL 1
719 #define GOT_TLS_GD 2
720 #define GOT_TLS_IE 4
721 #define GOT_TLS_IE_POS 5
722 #define GOT_TLS_IE_NEG 6
723 #define GOT_TLS_IE_BOTH 7
724 #define GOT_TLS_GDESC 8
725 #define GOT_TLS_GD_BOTH_P(type) \
726 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
727 #define GOT_TLS_GD_P(type) \
728 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
729 #define GOT_TLS_GDESC_P(type) \
730 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
731 #define GOT_TLS_GD_ANY_P(type) \
732 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
733 unsigned char tls_type;
734
735 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
736 starting at the end of the jump table. */
737 bfd_vma tlsdesc_got;
738 };
739
740 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
741
742 struct elf_i386_obj_tdata
743 {
744 struct elf_obj_tdata root;
745
746 /* tls_type for each local got entry. */
747 char *local_got_tls_type;
748
749 /* GOTPLT entries for TLS descriptors. */
750 bfd_vma *local_tlsdesc_gotent;
751 };
752
753 #define elf_i386_tdata(abfd) \
754 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
755
756 #define elf_i386_local_got_tls_type(abfd) \
757 (elf_i386_tdata (abfd)->local_got_tls_type)
758
759 #define elf_i386_local_tlsdesc_gotent(abfd) \
760 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
761
762 #define is_i386_elf(bfd) \
763 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
764 && elf_tdata (bfd) != NULL \
765 && elf_object_id (bfd) == I386_ELF_DATA)
766
767 static bfd_boolean
768 elf_i386_mkobject (bfd *abfd)
769 {
770 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
771 I386_ELF_DATA);
772 }
773
774 /* i386 ELF linker hash table. */
775
776 struct elf_i386_link_hash_table
777 {
778 struct elf_link_hash_table elf;
779
780 /* Short-cuts to get to dynamic linker sections. */
781 asection *sdynbss;
782 asection *srelbss;
783 asection *plt_eh_frame;
784
785 union
786 {
787 bfd_signed_vma refcount;
788 bfd_vma offset;
789 } tls_ldm_got;
790
791 /* The amount of space used by the reserved portion of the sgotplt
792 section, plus whatever space is used by the jump slots. */
793 bfd_vma sgotplt_jump_table_size;
794
795 /* Small local sym cache. */
796 struct sym_cache sym_cache;
797
798 /* _TLS_MODULE_BASE_ symbol. */
799 struct bfd_link_hash_entry *tls_module_base;
800
801 /* Used by local STT_GNU_IFUNC symbols. */
802 htab_t loc_hash_table;
803 void * loc_hash_memory;
804
805 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
806 asection *srelplt2;
807
808 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
809 bfd_vma next_tls_desc_index;
810
811 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
812 bfd_vma next_jump_slot_index;
813
814 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
815 bfd_vma next_irelative_index;
816 };
817
818 /* Get the i386 ELF linker hash table from a link_info structure. */
819
820 #define elf_i386_hash_table(p) \
821 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
822 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
823
824 #define elf_i386_compute_jump_table_size(htab) \
825 ((htab)->next_tls_desc_index * 4)
826
827 /* Create an entry in an i386 ELF linker hash table. */
828
829 static struct bfd_hash_entry *
830 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
831 struct bfd_hash_table *table,
832 const char *string)
833 {
834 /* Allocate the structure if it has not already been allocated by a
835 subclass. */
836 if (entry == NULL)
837 {
838 entry = (struct bfd_hash_entry *)
839 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
840 if (entry == NULL)
841 return entry;
842 }
843
844 /* Call the allocation method of the superclass. */
845 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
846 if (entry != NULL)
847 {
848 struct elf_i386_link_hash_entry *eh;
849
850 eh = (struct elf_i386_link_hash_entry *) entry;
851 eh->dyn_relocs = NULL;
852 eh->tls_type = GOT_UNKNOWN;
853 eh->tlsdesc_got = (bfd_vma) -1;
854 }
855
856 return entry;
857 }
858
859 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
860 for local symbol so that we can handle local STT_GNU_IFUNC symbols
861 as global symbol. We reuse indx and dynstr_index for local symbol
862 hash since they aren't used by global symbols in this backend. */
863
864 static hashval_t
865 elf_i386_local_htab_hash (const void *ptr)
866 {
867 struct elf_link_hash_entry *h
868 = (struct elf_link_hash_entry *) ptr;
869 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
870 }
871
872 /* Compare local hash entries. */
873
874 static int
875 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
876 {
877 struct elf_link_hash_entry *h1
878 = (struct elf_link_hash_entry *) ptr1;
879 struct elf_link_hash_entry *h2
880 = (struct elf_link_hash_entry *) ptr2;
881
882 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
883 }
884
885 /* Find and/or create a hash entry for local symbol. */
886
887 static struct elf_link_hash_entry *
888 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
889 bfd *abfd, const Elf_Internal_Rela *rel,
890 bfd_boolean create)
891 {
892 struct elf_i386_link_hash_entry e, *ret;
893 asection *sec = abfd->sections;
894 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
895 ELF32_R_SYM (rel->r_info));
896 void **slot;
897
898 e.elf.indx = sec->id;
899 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
900 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
901 create ? INSERT : NO_INSERT);
902
903 if (!slot)
904 return NULL;
905
906 if (*slot)
907 {
908 ret = (struct elf_i386_link_hash_entry *) *slot;
909 return &ret->elf;
910 }
911
912 ret = (struct elf_i386_link_hash_entry *)
913 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
914 sizeof (struct elf_i386_link_hash_entry));
915 if (ret)
916 {
917 memset (ret, 0, sizeof (*ret));
918 ret->elf.indx = sec->id;
919 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
920 ret->elf.dynindx = -1;
921 *slot = ret;
922 }
923 return &ret->elf;
924 }
925
926 /* Create an i386 ELF linker hash table. */
927
928 static struct bfd_link_hash_table *
929 elf_i386_link_hash_table_create (bfd *abfd)
930 {
931 struct elf_i386_link_hash_table *ret;
932 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
933
934 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
935 if (ret == NULL)
936 return NULL;
937
938 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
939 elf_i386_link_hash_newfunc,
940 sizeof (struct elf_i386_link_hash_entry),
941 I386_ELF_DATA))
942 {
943 free (ret);
944 return NULL;
945 }
946
947 ret->sdynbss = NULL;
948 ret->srelbss = NULL;
949 ret->plt_eh_frame = NULL;
950 ret->tls_ldm_got.refcount = 0;
951 ret->next_tls_desc_index = 0;
952 ret->sgotplt_jump_table_size = 0;
953 ret->sym_cache.abfd = NULL;
954 ret->srelplt2 = NULL;
955 ret->tls_module_base = NULL;
956 ret->next_jump_slot_index = 0;
957 ret->next_irelative_index = 0;
958
959 ret->loc_hash_table = htab_try_create (1024,
960 elf_i386_local_htab_hash,
961 elf_i386_local_htab_eq,
962 NULL);
963 ret->loc_hash_memory = objalloc_create ();
964 if (!ret->loc_hash_table || !ret->loc_hash_memory)
965 {
966 free (ret);
967 return NULL;
968 }
969
970 return &ret->elf.root;
971 }
972
973 /* Destroy an i386 ELF linker hash table. */
974
975 static void
976 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
977 {
978 struct elf_i386_link_hash_table *htab
979 = (struct elf_i386_link_hash_table *) hash;
980
981 if (htab->loc_hash_table)
982 htab_delete (htab->loc_hash_table);
983 if (htab->loc_hash_memory)
984 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
985 _bfd_generic_link_hash_table_free (hash);
986 }
987
988 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
989 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
990 hash table. */
991
992 static bfd_boolean
993 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
994 {
995 struct elf_i386_link_hash_table *htab;
996
997 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
998 return FALSE;
999
1000 htab = elf_i386_hash_table (info);
1001 if (htab == NULL)
1002 return FALSE;
1003
1004 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1005 if (!info->shared)
1006 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1007
1008 if (!htab->sdynbss
1009 || (!info->shared && !htab->srelbss))
1010 abort ();
1011
1012 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1013 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1014 &htab->srelplt2))
1015 return FALSE;
1016
1017 if (!info->no_ld_generated_unwind_info
1018 && htab->plt_eh_frame == NULL
1019 && htab->elf.splt != NULL)
1020 {
1021 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1022 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1023 | SEC_LINKER_CREATED);
1024 htab->plt_eh_frame
1025 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1026 if (htab->plt_eh_frame == NULL
1027 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1028 return FALSE;
1029 }
1030
1031 return TRUE;
1032 }
1033
1034 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1035
1036 static void
1037 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1038 struct elf_link_hash_entry *dir,
1039 struct elf_link_hash_entry *ind)
1040 {
1041 struct elf_i386_link_hash_entry *edir, *eind;
1042
1043 edir = (struct elf_i386_link_hash_entry *) dir;
1044 eind = (struct elf_i386_link_hash_entry *) ind;
1045
1046 if (eind->dyn_relocs != NULL)
1047 {
1048 if (edir->dyn_relocs != NULL)
1049 {
1050 struct elf_dyn_relocs **pp;
1051 struct elf_dyn_relocs *p;
1052
1053 /* Add reloc counts against the indirect sym to the direct sym
1054 list. Merge any entries against the same section. */
1055 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1056 {
1057 struct elf_dyn_relocs *q;
1058
1059 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1060 if (q->sec == p->sec)
1061 {
1062 q->pc_count += p->pc_count;
1063 q->count += p->count;
1064 *pp = p->next;
1065 break;
1066 }
1067 if (q == NULL)
1068 pp = &p->next;
1069 }
1070 *pp = edir->dyn_relocs;
1071 }
1072
1073 edir->dyn_relocs = eind->dyn_relocs;
1074 eind->dyn_relocs = NULL;
1075 }
1076
1077 if (ind->root.type == bfd_link_hash_indirect
1078 && dir->got.refcount <= 0)
1079 {
1080 edir->tls_type = eind->tls_type;
1081 eind->tls_type = GOT_UNKNOWN;
1082 }
1083
1084 if (ELIMINATE_COPY_RELOCS
1085 && ind->root.type != bfd_link_hash_indirect
1086 && dir->dynamic_adjusted)
1087 {
1088 /* If called to transfer flags for a weakdef during processing
1089 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1090 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1091 dir->ref_dynamic |= ind->ref_dynamic;
1092 dir->ref_regular |= ind->ref_regular;
1093 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1094 dir->needs_plt |= ind->needs_plt;
1095 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1096 }
1097 else
1098 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1099 }
1100
1101 /* Return TRUE if the TLS access code sequence support transition
1102 from R_TYPE. */
1103
1104 static bfd_boolean
1105 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1106 bfd_byte *contents,
1107 Elf_Internal_Shdr *symtab_hdr,
1108 struct elf_link_hash_entry **sym_hashes,
1109 unsigned int r_type,
1110 const Elf_Internal_Rela *rel,
1111 const Elf_Internal_Rela *relend)
1112 {
1113 unsigned int val, type;
1114 unsigned long r_symndx;
1115 struct elf_link_hash_entry *h;
1116 bfd_vma offset;
1117
1118 /* Get the section contents. */
1119 if (contents == NULL)
1120 {
1121 if (elf_section_data (sec)->this_hdr.contents != NULL)
1122 contents = elf_section_data (sec)->this_hdr.contents;
1123 else
1124 {
1125 /* FIXME: How to better handle error condition? */
1126 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1127 return FALSE;
1128
1129 /* Cache the section contents for elf_link_input_bfd. */
1130 elf_section_data (sec)->this_hdr.contents = contents;
1131 }
1132 }
1133
1134 offset = rel->r_offset;
1135 switch (r_type)
1136 {
1137 case R_386_TLS_GD:
1138 case R_386_TLS_LDM:
1139 if (offset < 2 || (rel + 1) >= relend)
1140 return FALSE;
1141
1142 type = bfd_get_8 (abfd, contents + offset - 2);
1143 if (r_type == R_386_TLS_GD)
1144 {
1145 /* Check transition from GD access model. Only
1146 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1147 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1148 can transit to different access model. */
1149 if ((offset + 10) > sec->size ||
1150 (type != 0x8d && type != 0x04))
1151 return FALSE;
1152
1153 val = bfd_get_8 (abfd, contents + offset - 1);
1154 if (type == 0x04)
1155 {
1156 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1157 if (offset < 3)
1158 return FALSE;
1159
1160 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1161 return FALSE;
1162
1163 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1164 return FALSE;
1165 }
1166 else
1167 {
1168 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1169 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1170 return FALSE;
1171
1172 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1173 return FALSE;
1174 }
1175 }
1176 else
1177 {
1178 /* Check transition from LD access model. Only
1179 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1180 can transit to different access model. */
1181 if (type != 0x8d || (offset + 9) > sec->size)
1182 return FALSE;
1183
1184 val = bfd_get_8 (abfd, contents + offset - 1);
1185 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1186 return FALSE;
1187 }
1188
1189 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1190 return FALSE;
1191
1192 r_symndx = ELF32_R_SYM (rel[1].r_info);
1193 if (r_symndx < symtab_hdr->sh_info)
1194 return FALSE;
1195
1196 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1197 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1198 may be versioned. */
1199 return (h != NULL
1200 && h->root.root.string != NULL
1201 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1202 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1203 && (strncmp (h->root.root.string, "___tls_get_addr",
1204 15) == 0));
1205
1206 case R_386_TLS_IE:
1207 /* Check transition from IE access model:
1208 movl foo@indntpoff(%rip), %eax
1209 movl foo@indntpoff(%rip), %reg
1210 addl foo@indntpoff(%rip), %reg
1211 */
1212
1213 if (offset < 1 || (offset + 4) > sec->size)
1214 return FALSE;
1215
1216 /* Check "movl foo@tpoff(%rip), %eax" first. */
1217 val = bfd_get_8 (abfd, contents + offset - 1);
1218 if (val == 0xa1)
1219 return TRUE;
1220
1221 if (offset < 2)
1222 return FALSE;
1223
1224 /* Check movl|addl foo@tpoff(%rip), %reg. */
1225 type = bfd_get_8 (abfd, contents + offset - 2);
1226 return ((type == 0x8b || type == 0x03)
1227 && (val & 0xc7) == 0x05);
1228
1229 case R_386_TLS_GOTIE:
1230 case R_386_TLS_IE_32:
1231 /* Check transition from {IE_32,GOTIE} access model:
1232 subl foo@{tpoff,gontoff}(%reg1), %reg2
1233 movl foo@{tpoff,gontoff}(%reg1), %reg2
1234 addl foo@{tpoff,gontoff}(%reg1), %reg2
1235 */
1236
1237 if (offset < 2 || (offset + 4) > sec->size)
1238 return FALSE;
1239
1240 val = bfd_get_8 (abfd, contents + offset - 1);
1241 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1242 return FALSE;
1243
1244 type = bfd_get_8 (abfd, contents + offset - 2);
1245 return type == 0x8b || type == 0x2b || type == 0x03;
1246
1247 case R_386_TLS_GOTDESC:
1248 /* Check transition from GDesc access model:
1249 leal x@tlsdesc(%ebx), %eax
1250
1251 Make sure it's a leal adding ebx to a 32-bit offset
1252 into any register, although it's probably almost always
1253 going to be eax. */
1254
1255 if (offset < 2 || (offset + 4) > sec->size)
1256 return FALSE;
1257
1258 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1259 return FALSE;
1260
1261 val = bfd_get_8 (abfd, contents + offset - 1);
1262 return (val & 0xc7) == 0x83;
1263
1264 case R_386_TLS_DESC_CALL:
1265 /* Check transition from GDesc access model:
1266 call *x@tlsdesc(%rax)
1267 */
1268 if (offset + 2 <= sec->size)
1269 {
1270 /* Make sure that it's a call *x@tlsdesc(%rax). */
1271 static const unsigned char call[] = { 0xff, 0x10 };
1272 return memcmp (contents + offset, call, 2) == 0;
1273 }
1274
1275 return FALSE;
1276
1277 default:
1278 abort ();
1279 }
1280 }
1281
1282 /* Return TRUE if the TLS access transition is OK or no transition
1283 will be performed. Update R_TYPE if there is a transition. */
1284
1285 static bfd_boolean
1286 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1287 asection *sec, bfd_byte *contents,
1288 Elf_Internal_Shdr *symtab_hdr,
1289 struct elf_link_hash_entry **sym_hashes,
1290 unsigned int *r_type, int tls_type,
1291 const Elf_Internal_Rela *rel,
1292 const Elf_Internal_Rela *relend,
1293 struct elf_link_hash_entry *h,
1294 unsigned long r_symndx)
1295 {
1296 unsigned int from_type = *r_type;
1297 unsigned int to_type = from_type;
1298 bfd_boolean check = TRUE;
1299
1300 /* Skip TLS transition for functions. */
1301 if (h != NULL
1302 && (h->type == STT_FUNC
1303 || h->type == STT_GNU_IFUNC))
1304 return TRUE;
1305
1306 switch (from_type)
1307 {
1308 case R_386_TLS_GD:
1309 case R_386_TLS_GOTDESC:
1310 case R_386_TLS_DESC_CALL:
1311 case R_386_TLS_IE_32:
1312 case R_386_TLS_IE:
1313 case R_386_TLS_GOTIE:
1314 if (info->executable)
1315 {
1316 if (h == NULL)
1317 to_type = R_386_TLS_LE_32;
1318 else if (from_type != R_386_TLS_IE
1319 && from_type != R_386_TLS_GOTIE)
1320 to_type = R_386_TLS_IE_32;
1321 }
1322
1323 /* When we are called from elf_i386_relocate_section, CONTENTS
1324 isn't NULL and there may be additional transitions based on
1325 TLS_TYPE. */
1326 if (contents != NULL)
1327 {
1328 unsigned int new_to_type = to_type;
1329
1330 if (info->executable
1331 && h != NULL
1332 && h->dynindx == -1
1333 && (tls_type & GOT_TLS_IE))
1334 new_to_type = R_386_TLS_LE_32;
1335
1336 if (to_type == R_386_TLS_GD
1337 || to_type == R_386_TLS_GOTDESC
1338 || to_type == R_386_TLS_DESC_CALL)
1339 {
1340 if (tls_type == GOT_TLS_IE_POS)
1341 new_to_type = R_386_TLS_GOTIE;
1342 else if (tls_type & GOT_TLS_IE)
1343 new_to_type = R_386_TLS_IE_32;
1344 }
1345
1346 /* We checked the transition before when we were called from
1347 elf_i386_check_relocs. We only want to check the new
1348 transition which hasn't been checked before. */
1349 check = new_to_type != to_type && from_type == to_type;
1350 to_type = new_to_type;
1351 }
1352
1353 break;
1354
1355 case R_386_TLS_LDM:
1356 if (info->executable)
1357 to_type = R_386_TLS_LE_32;
1358 break;
1359
1360 default:
1361 return TRUE;
1362 }
1363
1364 /* Return TRUE if there is no transition. */
1365 if (from_type == to_type)
1366 return TRUE;
1367
1368 /* Check if the transition can be performed. */
1369 if (check
1370 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1371 symtab_hdr, sym_hashes,
1372 from_type, rel, relend))
1373 {
1374 reloc_howto_type *from, *to;
1375 const char *name;
1376
1377 from = elf_i386_rtype_to_howto (abfd, from_type);
1378 to = elf_i386_rtype_to_howto (abfd, to_type);
1379
1380 if (h)
1381 name = h->root.root.string;
1382 else
1383 {
1384 struct elf_i386_link_hash_table *htab;
1385
1386 htab = elf_i386_hash_table (info);
1387 if (htab == NULL)
1388 name = "*unknown*";
1389 else
1390 {
1391 Elf_Internal_Sym *isym;
1392
1393 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1394 abfd, r_symndx);
1395 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1396 }
1397 }
1398
1399 (*_bfd_error_handler)
1400 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1401 "in section `%A' failed"),
1402 abfd, sec, from->name, to->name, name,
1403 (unsigned long) rel->r_offset);
1404 bfd_set_error (bfd_error_bad_value);
1405 return FALSE;
1406 }
1407
1408 *r_type = to_type;
1409 return TRUE;
1410 }
1411
1412 /* Look through the relocs for a section during the first phase, and
1413 calculate needed space in the global offset table, procedure linkage
1414 table, and dynamic reloc sections. */
1415
1416 static bfd_boolean
1417 elf_i386_check_relocs (bfd *abfd,
1418 struct bfd_link_info *info,
1419 asection *sec,
1420 const Elf_Internal_Rela *relocs)
1421 {
1422 struct elf_i386_link_hash_table *htab;
1423 Elf_Internal_Shdr *symtab_hdr;
1424 struct elf_link_hash_entry **sym_hashes;
1425 const Elf_Internal_Rela *rel;
1426 const Elf_Internal_Rela *rel_end;
1427 asection *sreloc;
1428
1429 if (info->relocatable)
1430 return TRUE;
1431
1432 BFD_ASSERT (is_i386_elf (abfd));
1433
1434 htab = elf_i386_hash_table (info);
1435 if (htab == NULL)
1436 return FALSE;
1437
1438 symtab_hdr = &elf_symtab_hdr (abfd);
1439 sym_hashes = elf_sym_hashes (abfd);
1440
1441 sreloc = NULL;
1442
1443 rel_end = relocs + sec->reloc_count;
1444 for (rel = relocs; rel < rel_end; rel++)
1445 {
1446 unsigned int r_type;
1447 unsigned long r_symndx;
1448 struct elf_link_hash_entry *h;
1449 Elf_Internal_Sym *isym;
1450 const char *name;
1451
1452 r_symndx = ELF32_R_SYM (rel->r_info);
1453 r_type = ELF32_R_TYPE (rel->r_info);
1454
1455 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1456 {
1457 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1458 abfd,
1459 r_symndx);
1460 return FALSE;
1461 }
1462
1463 if (r_symndx < symtab_hdr->sh_info)
1464 {
1465 /* A local symbol. */
1466 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1467 abfd, r_symndx);
1468 if (isym == NULL)
1469 return FALSE;
1470
1471 /* Check relocation against local STT_GNU_IFUNC symbol. */
1472 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1473 {
1474 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1475 if (h == NULL)
1476 return FALSE;
1477
1478 /* Fake a STT_GNU_IFUNC symbol. */
1479 h->type = STT_GNU_IFUNC;
1480 h->def_regular = 1;
1481 h->ref_regular = 1;
1482 h->forced_local = 1;
1483 h->root.type = bfd_link_hash_defined;
1484 }
1485 else
1486 h = NULL;
1487 }
1488 else
1489 {
1490 isym = NULL;
1491 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1492 while (h->root.type == bfd_link_hash_indirect
1493 || h->root.type == bfd_link_hash_warning)
1494 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1495 }
1496
1497 if (h != NULL)
1498 {
1499 /* Create the ifunc sections for static executables. If we
1500 never see an indirect function symbol nor we are building
1501 a static executable, those sections will be empty and
1502 won't appear in output. */
1503 switch (r_type)
1504 {
1505 default:
1506 break;
1507
1508 case R_386_32:
1509 case R_386_PC32:
1510 case R_386_PLT32:
1511 case R_386_GOT32:
1512 case R_386_GOTOFF:
1513 if (htab->elf.dynobj == NULL)
1514 htab->elf.dynobj = abfd;
1515 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1516 return FALSE;
1517 break;
1518 }
1519
1520 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1521 it here if it is defined in a non-shared object. */
1522 if (h->type == STT_GNU_IFUNC
1523 && h->def_regular)
1524 {
1525 /* It is referenced by a non-shared object. */
1526 h->ref_regular = 1;
1527 h->needs_plt = 1;
1528
1529 /* STT_GNU_IFUNC symbol must go through PLT. */
1530 h->plt.refcount += 1;
1531
1532 /* STT_GNU_IFUNC needs dynamic sections. */
1533 if (htab->elf.dynobj == NULL)
1534 htab->elf.dynobj = abfd;
1535
1536 switch (r_type)
1537 {
1538 default:
1539 if (h->root.root.string)
1540 name = h->root.root.string;
1541 else
1542 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1543 NULL);
1544 (*_bfd_error_handler)
1545 (_("%B: relocation %s against STT_GNU_IFUNC "
1546 "symbol `%s' isn't handled by %s"), abfd,
1547 elf_howto_table[r_type].name,
1548 name, __FUNCTION__);
1549 bfd_set_error (bfd_error_bad_value);
1550 return FALSE;
1551
1552 case R_386_32:
1553 h->non_got_ref = 1;
1554 h->pointer_equality_needed = 1;
1555 if (info->shared)
1556 {
1557 /* We must copy these reloc types into the
1558 output file. Create a reloc section in
1559 dynobj and make room for this reloc. */
1560 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1561 (abfd, info, sec, sreloc,
1562 &((struct elf_i386_link_hash_entry *) h)->dyn_relocs);
1563 if (sreloc == NULL)
1564 return FALSE;
1565 }
1566 break;
1567
1568 case R_386_PC32:
1569 h->non_got_ref = 1;
1570 break;
1571
1572 case R_386_PLT32:
1573 break;
1574
1575 case R_386_GOT32:
1576 case R_386_GOTOFF:
1577 h->got.refcount += 1;
1578 if (htab->elf.sgot == NULL
1579 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1580 info))
1581 return FALSE;
1582 break;
1583 }
1584
1585 continue;
1586 }
1587 }
1588
1589 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1590 symtab_hdr, sym_hashes,
1591 &r_type, GOT_UNKNOWN,
1592 rel, rel_end, h, r_symndx))
1593 return FALSE;
1594
1595 switch (r_type)
1596 {
1597 case R_386_TLS_LDM:
1598 htab->tls_ldm_got.refcount += 1;
1599 goto create_got;
1600
1601 case R_386_PLT32:
1602 /* This symbol requires a procedure linkage table entry. We
1603 actually build the entry in adjust_dynamic_symbol,
1604 because this might be a case of linking PIC code which is
1605 never referenced by a dynamic object, in which case we
1606 don't need to generate a procedure linkage table entry
1607 after all. */
1608
1609 /* If this is a local symbol, we resolve it directly without
1610 creating a procedure linkage table entry. */
1611 if (h == NULL)
1612 continue;
1613
1614 h->needs_plt = 1;
1615 h->plt.refcount += 1;
1616 break;
1617
1618 case R_386_TLS_IE_32:
1619 case R_386_TLS_IE:
1620 case R_386_TLS_GOTIE:
1621 if (!info->executable)
1622 info->flags |= DF_STATIC_TLS;
1623 /* Fall through */
1624
1625 case R_386_GOT32:
1626 case R_386_TLS_GD:
1627 case R_386_TLS_GOTDESC:
1628 case R_386_TLS_DESC_CALL:
1629 /* This symbol requires a global offset table entry. */
1630 {
1631 int tls_type, old_tls_type;
1632
1633 switch (r_type)
1634 {
1635 default:
1636 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1637 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1638 case R_386_TLS_GOTDESC:
1639 case R_386_TLS_DESC_CALL:
1640 tls_type = GOT_TLS_GDESC; break;
1641 case R_386_TLS_IE_32:
1642 if (ELF32_R_TYPE (rel->r_info) == r_type)
1643 tls_type = GOT_TLS_IE_NEG;
1644 else
1645 /* If this is a GD->IE transition, we may use either of
1646 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1647 tls_type = GOT_TLS_IE;
1648 break;
1649 case R_386_TLS_IE:
1650 case R_386_TLS_GOTIE:
1651 tls_type = GOT_TLS_IE_POS; break;
1652 }
1653
1654 if (h != NULL)
1655 {
1656 h->got.refcount += 1;
1657 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1658 }
1659 else
1660 {
1661 bfd_signed_vma *local_got_refcounts;
1662
1663 /* This is a global offset table entry for a local symbol. */
1664 local_got_refcounts = elf_local_got_refcounts (abfd);
1665 if (local_got_refcounts == NULL)
1666 {
1667 bfd_size_type size;
1668
1669 size = symtab_hdr->sh_info;
1670 size *= (sizeof (bfd_signed_vma)
1671 + sizeof (bfd_vma) + sizeof(char));
1672 local_got_refcounts = (bfd_signed_vma *)
1673 bfd_zalloc (abfd, size);
1674 if (local_got_refcounts == NULL)
1675 return FALSE;
1676 elf_local_got_refcounts (abfd) = local_got_refcounts;
1677 elf_i386_local_tlsdesc_gotent (abfd)
1678 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1679 elf_i386_local_got_tls_type (abfd)
1680 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1681 }
1682 local_got_refcounts[r_symndx] += 1;
1683 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1684 }
1685
1686 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1687 tls_type |= old_tls_type;
1688 /* If a TLS symbol is accessed using IE at least once,
1689 there is no point to use dynamic model for it. */
1690 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1691 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1692 || (tls_type & GOT_TLS_IE) == 0))
1693 {
1694 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1695 tls_type = old_tls_type;
1696 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1697 && GOT_TLS_GD_ANY_P (tls_type))
1698 tls_type |= old_tls_type;
1699 else
1700 {
1701 if (h)
1702 name = h->root.root.string;
1703 else
1704 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1705 NULL);
1706 (*_bfd_error_handler)
1707 (_("%B: `%s' accessed both as normal and "
1708 "thread local symbol"),
1709 abfd, name);
1710 return FALSE;
1711 }
1712 }
1713
1714 if (old_tls_type != tls_type)
1715 {
1716 if (h != NULL)
1717 elf_i386_hash_entry (h)->tls_type = tls_type;
1718 else
1719 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1720 }
1721 }
1722 /* Fall through */
1723
1724 case R_386_GOTOFF:
1725 case R_386_GOTPC:
1726 create_got:
1727 if (htab->elf.sgot == NULL)
1728 {
1729 if (htab->elf.dynobj == NULL)
1730 htab->elf.dynobj = abfd;
1731 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1732 return FALSE;
1733 }
1734 if (r_type != R_386_TLS_IE)
1735 break;
1736 /* Fall through */
1737
1738 case R_386_TLS_LE_32:
1739 case R_386_TLS_LE:
1740 if (info->executable)
1741 break;
1742 info->flags |= DF_STATIC_TLS;
1743 /* Fall through */
1744
1745 case R_386_32:
1746 case R_386_PC32:
1747 if (h != NULL && info->executable)
1748 {
1749 /* If this reloc is in a read-only section, we might
1750 need a copy reloc. We can't check reliably at this
1751 stage whether the section is read-only, as input
1752 sections have not yet been mapped to output sections.
1753 Tentatively set the flag for now, and correct in
1754 adjust_dynamic_symbol. */
1755 h->non_got_ref = 1;
1756
1757 /* We may need a .plt entry if the function this reloc
1758 refers to is in a shared lib. */
1759 h->plt.refcount += 1;
1760 if (r_type != R_386_PC32)
1761 h->pointer_equality_needed = 1;
1762 }
1763
1764 /* If we are creating a shared library, and this is a reloc
1765 against a global symbol, or a non PC relative reloc
1766 against a local symbol, then we need to copy the reloc
1767 into the shared library. However, if we are linking with
1768 -Bsymbolic, we do not need to copy a reloc against a
1769 global symbol which is defined in an object we are
1770 including in the link (i.e., DEF_REGULAR is set). At
1771 this point we have not seen all the input files, so it is
1772 possible that DEF_REGULAR is not set now but will be set
1773 later (it is never cleared). In case of a weak definition,
1774 DEF_REGULAR may be cleared later by a strong definition in
1775 a shared library. We account for that possibility below by
1776 storing information in the relocs_copied field of the hash
1777 table entry. A similar situation occurs when creating
1778 shared libraries and symbol visibility changes render the
1779 symbol local.
1780
1781 If on the other hand, we are creating an executable, we
1782 may need to keep relocations for symbols satisfied by a
1783 dynamic library if we manage to avoid copy relocs for the
1784 symbol. */
1785 if ((info->shared
1786 && (sec->flags & SEC_ALLOC) != 0
1787 && (r_type != R_386_PC32
1788 || (h != NULL
1789 && (! SYMBOLIC_BIND (info, h)
1790 || h->root.type == bfd_link_hash_defweak
1791 || !h->def_regular))))
1792 || (ELIMINATE_COPY_RELOCS
1793 && !info->shared
1794 && (sec->flags & SEC_ALLOC) != 0
1795 && h != NULL
1796 && (h->root.type == bfd_link_hash_defweak
1797 || !h->def_regular)))
1798 {
1799 struct elf_dyn_relocs *p;
1800 struct elf_dyn_relocs **head;
1801
1802 /* We must copy these reloc types into the output file.
1803 Create a reloc section in dynobj and make room for
1804 this reloc. */
1805 if (sreloc == NULL)
1806 {
1807 if (htab->elf.dynobj == NULL)
1808 htab->elf.dynobj = abfd;
1809
1810 sreloc = _bfd_elf_make_dynamic_reloc_section
1811 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1812
1813 if (sreloc == NULL)
1814 return FALSE;
1815 }
1816
1817 /* If this is a global symbol, we count the number of
1818 relocations we need for this symbol. */
1819 if (h != NULL)
1820 {
1821 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1822 }
1823 else
1824 {
1825 /* Track dynamic relocs needed for local syms too.
1826 We really need local syms available to do this
1827 easily. Oh well. */
1828 void **vpp;
1829 asection *s;
1830
1831 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1832 abfd, r_symndx);
1833 if (isym == NULL)
1834 return FALSE;
1835
1836 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1837 if (s == NULL)
1838 s = sec;
1839
1840 vpp = &elf_section_data (s)->local_dynrel;
1841 head = (struct elf_dyn_relocs **)vpp;
1842 }
1843
1844 p = *head;
1845 if (p == NULL || p->sec != sec)
1846 {
1847 bfd_size_type amt = sizeof *p;
1848 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1849 amt);
1850 if (p == NULL)
1851 return FALSE;
1852 p->next = *head;
1853 *head = p;
1854 p->sec = sec;
1855 p->count = 0;
1856 p->pc_count = 0;
1857 }
1858
1859 p->count += 1;
1860 if (r_type == R_386_PC32)
1861 p->pc_count += 1;
1862 }
1863 break;
1864
1865 /* This relocation describes the C++ object vtable hierarchy.
1866 Reconstruct it for later use during GC. */
1867 case R_386_GNU_VTINHERIT:
1868 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1869 return FALSE;
1870 break;
1871
1872 /* This relocation describes which C++ vtable entries are actually
1873 used. Record for later use during GC. */
1874 case R_386_GNU_VTENTRY:
1875 BFD_ASSERT (h != NULL);
1876 if (h != NULL
1877 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1878 return FALSE;
1879 break;
1880
1881 default:
1882 break;
1883 }
1884 }
1885
1886 return TRUE;
1887 }
1888
1889 /* Return the section that should be marked against GC for a given
1890 relocation. */
1891
1892 static asection *
1893 elf_i386_gc_mark_hook (asection *sec,
1894 struct bfd_link_info *info,
1895 Elf_Internal_Rela *rel,
1896 struct elf_link_hash_entry *h,
1897 Elf_Internal_Sym *sym)
1898 {
1899 if (h != NULL)
1900 switch (ELF32_R_TYPE (rel->r_info))
1901 {
1902 case R_386_GNU_VTINHERIT:
1903 case R_386_GNU_VTENTRY:
1904 return NULL;
1905 }
1906
1907 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1908 }
1909
1910 /* Update the got entry reference counts for the section being removed. */
1911
1912 static bfd_boolean
1913 elf_i386_gc_sweep_hook (bfd *abfd,
1914 struct bfd_link_info *info,
1915 asection *sec,
1916 const Elf_Internal_Rela *relocs)
1917 {
1918 struct elf_i386_link_hash_table *htab;
1919 Elf_Internal_Shdr *symtab_hdr;
1920 struct elf_link_hash_entry **sym_hashes;
1921 bfd_signed_vma *local_got_refcounts;
1922 const Elf_Internal_Rela *rel, *relend;
1923
1924 if (info->relocatable)
1925 return TRUE;
1926
1927 htab = elf_i386_hash_table (info);
1928 if (htab == NULL)
1929 return FALSE;
1930
1931 elf_section_data (sec)->local_dynrel = NULL;
1932
1933 symtab_hdr = &elf_symtab_hdr (abfd);
1934 sym_hashes = elf_sym_hashes (abfd);
1935 local_got_refcounts = elf_local_got_refcounts (abfd);
1936
1937 relend = relocs + sec->reloc_count;
1938 for (rel = relocs; rel < relend; rel++)
1939 {
1940 unsigned long r_symndx;
1941 unsigned int r_type;
1942 struct elf_link_hash_entry *h = NULL;
1943
1944 r_symndx = ELF32_R_SYM (rel->r_info);
1945 if (r_symndx >= symtab_hdr->sh_info)
1946 {
1947 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1948 while (h->root.type == bfd_link_hash_indirect
1949 || h->root.type == bfd_link_hash_warning)
1950 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1951 }
1952 else
1953 {
1954 /* A local symbol. */
1955 Elf_Internal_Sym *isym;
1956
1957 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1958 abfd, r_symndx);
1959
1960 /* Check relocation against local STT_GNU_IFUNC symbol. */
1961 if (isym != NULL
1962 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1963 {
1964 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1965 if (h == NULL)
1966 abort ();
1967 }
1968 }
1969
1970 if (h)
1971 {
1972 struct elf_i386_link_hash_entry *eh;
1973 struct elf_dyn_relocs **pp;
1974 struct elf_dyn_relocs *p;
1975
1976 eh = (struct elf_i386_link_hash_entry *) h;
1977 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1978 if (p->sec == sec)
1979 {
1980 /* Everything must go for SEC. */
1981 *pp = p->next;
1982 break;
1983 }
1984 }
1985
1986 r_type = ELF32_R_TYPE (rel->r_info);
1987 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1988 symtab_hdr, sym_hashes,
1989 &r_type, GOT_UNKNOWN,
1990 rel, relend, h, r_symndx))
1991 return FALSE;
1992
1993 switch (r_type)
1994 {
1995 case R_386_TLS_LDM:
1996 if (htab->tls_ldm_got.refcount > 0)
1997 htab->tls_ldm_got.refcount -= 1;
1998 break;
1999
2000 case R_386_TLS_GD:
2001 case R_386_TLS_GOTDESC:
2002 case R_386_TLS_DESC_CALL:
2003 case R_386_TLS_IE_32:
2004 case R_386_TLS_IE:
2005 case R_386_TLS_GOTIE:
2006 case R_386_GOT32:
2007 if (h != NULL)
2008 {
2009 if (h->got.refcount > 0)
2010 h->got.refcount -= 1;
2011 if (h->type == STT_GNU_IFUNC)
2012 {
2013 if (h->plt.refcount > 0)
2014 h->plt.refcount -= 1;
2015 }
2016 }
2017 else if (local_got_refcounts != NULL)
2018 {
2019 if (local_got_refcounts[r_symndx] > 0)
2020 local_got_refcounts[r_symndx] -= 1;
2021 }
2022 break;
2023
2024 case R_386_32:
2025 case R_386_PC32:
2026 if (info->shared
2027 && (h == NULL || h->type != STT_GNU_IFUNC))
2028 break;
2029 /* Fall through */
2030
2031 case R_386_PLT32:
2032 if (h != NULL)
2033 {
2034 if (h->plt.refcount > 0)
2035 h->plt.refcount -= 1;
2036 }
2037 break;
2038
2039 case R_386_GOTOFF:
2040 if (h != NULL && h->type == STT_GNU_IFUNC)
2041 {
2042 if (h->got.refcount > 0)
2043 h->got.refcount -= 1;
2044 if (h->plt.refcount > 0)
2045 h->plt.refcount -= 1;
2046 }
2047 break;
2048
2049 default:
2050 break;
2051 }
2052 }
2053
2054 return TRUE;
2055 }
2056
2057 /* Adjust a symbol defined by a dynamic object and referenced by a
2058 regular object. The current definition is in some section of the
2059 dynamic object, but we're not including those sections. We have to
2060 change the definition to something the rest of the link can
2061 understand. */
2062
2063 static bfd_boolean
2064 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2065 struct elf_link_hash_entry *h)
2066 {
2067 struct elf_i386_link_hash_table *htab;
2068 asection *s;
2069
2070 /* STT_GNU_IFUNC symbol must go through PLT. */
2071 if (h->type == STT_GNU_IFUNC)
2072 {
2073 if (h->plt.refcount <= 0)
2074 {
2075 h->plt.offset = (bfd_vma) -1;
2076 h->needs_plt = 0;
2077 }
2078 return TRUE;
2079 }
2080
2081 /* If this is a function, put it in the procedure linkage table. We
2082 will fill in the contents of the procedure linkage table later,
2083 when we know the address of the .got section. */
2084 if (h->type == STT_FUNC
2085 || h->needs_plt)
2086 {
2087 if (h->plt.refcount <= 0
2088 || SYMBOL_CALLS_LOCAL (info, h)
2089 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2090 && h->root.type == bfd_link_hash_undefweak))
2091 {
2092 /* This case can occur if we saw a PLT32 reloc in an input
2093 file, but the symbol was never referred to by a dynamic
2094 object, or if all references were garbage collected. In
2095 such a case, we don't actually need to build a procedure
2096 linkage table, and we can just do a PC32 reloc instead. */
2097 h->plt.offset = (bfd_vma) -1;
2098 h->needs_plt = 0;
2099 }
2100
2101 return TRUE;
2102 }
2103 else
2104 /* It's possible that we incorrectly decided a .plt reloc was
2105 needed for an R_386_PC32 reloc to a non-function sym in
2106 check_relocs. We can't decide accurately between function and
2107 non-function syms in check-relocs; Objects loaded later in
2108 the link may change h->type. So fix it now. */
2109 h->plt.offset = (bfd_vma) -1;
2110
2111 /* If this is a weak symbol, and there is a real definition, the
2112 processor independent code will have arranged for us to see the
2113 real definition first, and we can just use the same value. */
2114 if (h->u.weakdef != NULL)
2115 {
2116 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2117 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2118 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2119 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2120 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2121 h->non_got_ref = h->u.weakdef->non_got_ref;
2122 return TRUE;
2123 }
2124
2125 /* This is a reference to a symbol defined by a dynamic object which
2126 is not a function. */
2127
2128 /* If we are creating a shared library, we must presume that the
2129 only references to the symbol are via the global offset table.
2130 For such cases we need not do anything here; the relocations will
2131 be handled correctly by relocate_section. */
2132 if (info->shared)
2133 return TRUE;
2134
2135 /* If there are no references to this symbol that do not use the
2136 GOT, we don't need to generate a copy reloc. */
2137 if (!h->non_got_ref)
2138 return TRUE;
2139
2140 /* If -z nocopyreloc was given, we won't generate them either. */
2141 if (info->nocopyreloc)
2142 {
2143 h->non_got_ref = 0;
2144 return TRUE;
2145 }
2146
2147 htab = elf_i386_hash_table (info);
2148 if (htab == NULL)
2149 return FALSE;
2150
2151 /* If there aren't any dynamic relocs in read-only sections, then
2152 we can keep the dynamic relocs and avoid the copy reloc. This
2153 doesn't work on VxWorks, where we can not have dynamic relocations
2154 (other than copy and jump slot relocations) in an executable. */
2155 if (ELIMINATE_COPY_RELOCS
2156 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2157 {
2158 struct elf_i386_link_hash_entry * eh;
2159 struct elf_dyn_relocs *p;
2160
2161 eh = (struct elf_i386_link_hash_entry *) h;
2162 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2163 {
2164 s = p->sec->output_section;
2165 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2166 break;
2167 }
2168
2169 if (p == NULL)
2170 {
2171 h->non_got_ref = 0;
2172 return TRUE;
2173 }
2174 }
2175
2176 /* We must allocate the symbol in our .dynbss section, which will
2177 become part of the .bss section of the executable. There will be
2178 an entry for this symbol in the .dynsym section. The dynamic
2179 object will contain position independent code, so all references
2180 from the dynamic object to this symbol will go through the global
2181 offset table. The dynamic linker will use the .dynsym entry to
2182 determine the address it must put in the global offset table, so
2183 both the dynamic object and the regular object will refer to the
2184 same memory location for the variable. */
2185
2186 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2187 copy the initial value out of the dynamic object and into the
2188 runtime process image. */
2189 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2190 {
2191 htab->srelbss->size += sizeof (Elf32_External_Rel);
2192 h->needs_copy = 1;
2193 }
2194
2195 s = htab->sdynbss;
2196
2197 return _bfd_elf_adjust_dynamic_copy (h, s);
2198 }
2199
2200 /* Allocate space in .plt, .got and associated reloc sections for
2201 dynamic relocs. */
2202
2203 static bfd_boolean
2204 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2205 {
2206 struct bfd_link_info *info;
2207 struct elf_i386_link_hash_table *htab;
2208 struct elf_i386_link_hash_entry *eh;
2209 struct elf_dyn_relocs *p;
2210 unsigned plt_entry_size;
2211
2212 if (h->root.type == bfd_link_hash_indirect)
2213 return TRUE;
2214
2215 eh = (struct elf_i386_link_hash_entry *) h;
2216
2217 info = (struct bfd_link_info *) inf;
2218 htab = elf_i386_hash_table (info);
2219 if (htab == NULL)
2220 return FALSE;
2221
2222 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2223
2224 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2225 here if it is defined and referenced in a non-shared object. */
2226 if (h->type == STT_GNU_IFUNC
2227 && h->def_regular)
2228 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2229 plt_entry_size, 4);
2230 else if (htab->elf.dynamic_sections_created
2231 && h->plt.refcount > 0)
2232 {
2233 /* Make sure this symbol is output as a dynamic symbol.
2234 Undefined weak syms won't yet be marked as dynamic. */
2235 if (h->dynindx == -1
2236 && !h->forced_local)
2237 {
2238 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2239 return FALSE;
2240 }
2241
2242 if (info->shared
2243 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2244 {
2245 asection *s = htab->elf.splt;
2246
2247 /* If this is the first .plt entry, make room for the special
2248 first entry. */
2249 if (s->size == 0)
2250 s->size += plt_entry_size;
2251
2252 h->plt.offset = s->size;
2253
2254 /* If this symbol is not defined in a regular file, and we are
2255 not generating a shared library, then set the symbol to this
2256 location in the .plt. This is required to make function
2257 pointers compare as equal between the normal executable and
2258 the shared library. */
2259 if (! info->shared
2260 && !h->def_regular)
2261 {
2262 h->root.u.def.section = s;
2263 h->root.u.def.value = h->plt.offset;
2264 }
2265
2266 /* Make room for this entry. */
2267 s->size += plt_entry_size;
2268
2269 /* We also need to make an entry in the .got.plt section, which
2270 will be placed in the .got section by the linker script. */
2271 htab->elf.sgotplt->size += 4;
2272
2273 /* We also need to make an entry in the .rel.plt section. */
2274 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2275 htab->elf.srelplt->reloc_count++;
2276
2277 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2278 && !info->shared)
2279 {
2280 /* VxWorks has a second set of relocations for each PLT entry
2281 in executables. They go in a separate relocation section,
2282 which is processed by the kernel loader. */
2283
2284 /* There are two relocations for the initial PLT entry: an
2285 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2286 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2287
2288 if (h->plt.offset == plt_entry_size)
2289 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2290
2291 /* There are two extra relocations for each subsequent PLT entry:
2292 an R_386_32 relocation for the GOT entry, and an R_386_32
2293 relocation for the PLT entry. */
2294
2295 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2296 }
2297 }
2298 else
2299 {
2300 h->plt.offset = (bfd_vma) -1;
2301 h->needs_plt = 0;
2302 }
2303 }
2304 else
2305 {
2306 h->plt.offset = (bfd_vma) -1;
2307 h->needs_plt = 0;
2308 }
2309
2310 eh->tlsdesc_got = (bfd_vma) -1;
2311
2312 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2313 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2314 if (h->got.refcount > 0
2315 && info->executable
2316 && h->dynindx == -1
2317 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2318 h->got.offset = (bfd_vma) -1;
2319 else if (h->got.refcount > 0)
2320 {
2321 asection *s;
2322 bfd_boolean dyn;
2323 int tls_type = elf_i386_hash_entry(h)->tls_type;
2324
2325 /* Make sure this symbol is output as a dynamic symbol.
2326 Undefined weak syms won't yet be marked as dynamic. */
2327 if (h->dynindx == -1
2328 && !h->forced_local)
2329 {
2330 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2331 return FALSE;
2332 }
2333
2334 s = htab->elf.sgot;
2335 if (GOT_TLS_GDESC_P (tls_type))
2336 {
2337 eh->tlsdesc_got = htab->elf.sgotplt->size
2338 - elf_i386_compute_jump_table_size (htab);
2339 htab->elf.sgotplt->size += 8;
2340 h->got.offset = (bfd_vma) -2;
2341 }
2342 if (! GOT_TLS_GDESC_P (tls_type)
2343 || GOT_TLS_GD_P (tls_type))
2344 {
2345 h->got.offset = s->size;
2346 s->size += 4;
2347 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2348 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2349 s->size += 4;
2350 }
2351 dyn = htab->elf.dynamic_sections_created;
2352 /* R_386_TLS_IE_32 needs one dynamic relocation,
2353 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2354 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2355 need two), R_386_TLS_GD needs one if local symbol and two if
2356 global. */
2357 if (tls_type == GOT_TLS_IE_BOTH)
2358 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2359 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2360 || (tls_type & GOT_TLS_IE))
2361 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2362 else if (GOT_TLS_GD_P (tls_type))
2363 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2364 else if (! GOT_TLS_GDESC_P (tls_type)
2365 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2366 || h->root.type != bfd_link_hash_undefweak)
2367 && (info->shared
2368 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2369 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2370 if (GOT_TLS_GDESC_P (tls_type))
2371 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2372 }
2373 else
2374 h->got.offset = (bfd_vma) -1;
2375
2376 if (eh->dyn_relocs == NULL)
2377 return TRUE;
2378
2379 /* In the shared -Bsymbolic case, discard space allocated for
2380 dynamic pc-relative relocs against symbols which turn out to be
2381 defined in regular objects. For the normal shared case, discard
2382 space for pc-relative relocs that have become local due to symbol
2383 visibility changes. */
2384
2385 if (info->shared)
2386 {
2387 /* The only reloc that uses pc_count is R_386_PC32, which will
2388 appear on a call or on something like ".long foo - .". We
2389 want calls to protected symbols to resolve directly to the
2390 function rather than going via the plt. If people want
2391 function pointer comparisons to work as expected then they
2392 should avoid writing assembly like ".long foo - .". */
2393 if (SYMBOL_CALLS_LOCAL (info, h))
2394 {
2395 struct elf_dyn_relocs **pp;
2396
2397 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2398 {
2399 p->count -= p->pc_count;
2400 p->pc_count = 0;
2401 if (p->count == 0)
2402 *pp = p->next;
2403 else
2404 pp = &p->next;
2405 }
2406 }
2407
2408 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2409 {
2410 struct elf_dyn_relocs **pp;
2411 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2412 {
2413 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2414 *pp = p->next;
2415 else
2416 pp = &p->next;
2417 }
2418 }
2419
2420 /* Also discard relocs on undefined weak syms with non-default
2421 visibility. */
2422 if (eh->dyn_relocs != NULL
2423 && h->root.type == bfd_link_hash_undefweak)
2424 {
2425 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2426 eh->dyn_relocs = NULL;
2427
2428 /* Make sure undefined weak symbols are output as a dynamic
2429 symbol in PIEs. */
2430 else if (h->dynindx == -1
2431 && !h->forced_local)
2432 {
2433 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2434 return FALSE;
2435 }
2436 }
2437 }
2438 else if (ELIMINATE_COPY_RELOCS)
2439 {
2440 /* For the non-shared case, discard space for relocs against
2441 symbols which turn out to need copy relocs or are not
2442 dynamic. */
2443
2444 if (!h->non_got_ref
2445 && ((h->def_dynamic
2446 && !h->def_regular)
2447 || (htab->elf.dynamic_sections_created
2448 && (h->root.type == bfd_link_hash_undefweak
2449 || h->root.type == bfd_link_hash_undefined))))
2450 {
2451 /* Make sure this symbol is output as a dynamic symbol.
2452 Undefined weak syms won't yet be marked as dynamic. */
2453 if (h->dynindx == -1
2454 && !h->forced_local)
2455 {
2456 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2457 return FALSE;
2458 }
2459
2460 /* If that succeeded, we know we'll be keeping all the
2461 relocs. */
2462 if (h->dynindx != -1)
2463 goto keep;
2464 }
2465
2466 eh->dyn_relocs = NULL;
2467
2468 keep: ;
2469 }
2470
2471 /* Finally, allocate space. */
2472 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2473 {
2474 asection *sreloc;
2475
2476 sreloc = elf_section_data (p->sec)->sreloc;
2477
2478 BFD_ASSERT (sreloc != NULL);
2479 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2480 }
2481
2482 return TRUE;
2483 }
2484
2485 /* Allocate space in .plt, .got and associated reloc sections for
2486 local dynamic relocs. */
2487
2488 static bfd_boolean
2489 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2490 {
2491 struct elf_link_hash_entry *h
2492 = (struct elf_link_hash_entry *) *slot;
2493
2494 if (h->type != STT_GNU_IFUNC
2495 || !h->def_regular
2496 || !h->ref_regular
2497 || !h->forced_local
2498 || h->root.type != bfd_link_hash_defined)
2499 abort ();
2500
2501 return elf_i386_allocate_dynrelocs (h, inf);
2502 }
2503
2504 /* Find any dynamic relocs that apply to read-only sections. */
2505
2506 static bfd_boolean
2507 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2508 {
2509 struct elf_i386_link_hash_entry *eh;
2510 struct elf_dyn_relocs *p;
2511
2512 /* Skip local IFUNC symbols. */
2513 if (h->forced_local && h->type == STT_GNU_IFUNC)
2514 return TRUE;
2515
2516 eh = (struct elf_i386_link_hash_entry *) h;
2517 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2518 {
2519 asection *s = p->sec->output_section;
2520
2521 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2522 {
2523 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2524
2525 info->flags |= DF_TEXTREL;
2526
2527 if (info->warn_shared_textrel && info->shared)
2528 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2529 p->sec->owner, h->root.root.string,
2530 p->sec);
2531
2532 /* Not an error, just cut short the traversal. */
2533 return FALSE;
2534 }
2535 }
2536 return TRUE;
2537 }
2538
2539 /* Convert
2540 mov foo@GOT(%reg), %reg
2541 to
2542 lea foo@GOTOFF(%reg), %reg
2543 with the local symbol, foo. */
2544
2545 static bfd_boolean
2546 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2547 struct bfd_link_info *link_info)
2548 {
2549 Elf_Internal_Shdr *symtab_hdr;
2550 Elf_Internal_Rela *internal_relocs;
2551 Elf_Internal_Rela *irel, *irelend;
2552 bfd_byte *contents;
2553 struct elf_i386_link_hash_table *htab;
2554 bfd_boolean changed_contents;
2555 bfd_boolean changed_relocs;
2556 bfd_signed_vma *local_got_refcounts;
2557
2558 /* Don't even try to convert non-ELF outputs. */
2559 if (!is_elf_hash_table (link_info->hash))
2560 return FALSE;
2561
2562 /* Nothing to do if there are no codes, no relocations or no output. */
2563 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2564 || sec->reloc_count == 0
2565 || discarded_section (sec))
2566 return TRUE;
2567
2568 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2569
2570 /* Load the relocations for this section. */
2571 internal_relocs = (_bfd_elf_link_read_relocs
2572 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2573 link_info->keep_memory));
2574 if (internal_relocs == NULL)
2575 return FALSE;
2576
2577 htab = elf_i386_hash_table (link_info);
2578 changed_contents = FALSE;
2579 changed_relocs = FALSE;
2580 local_got_refcounts = elf_local_got_refcounts (abfd);
2581
2582 /* Get the section contents. */
2583 if (elf_section_data (sec)->this_hdr.contents != NULL)
2584 contents = elf_section_data (sec)->this_hdr.contents;
2585 else
2586 {
2587 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2588 goto error_return;
2589 }
2590
2591 irelend = internal_relocs + sec->reloc_count;
2592 for (irel = internal_relocs; irel < irelend; irel++)
2593 {
2594 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2595 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2596 unsigned int indx;
2597 struct elf_link_hash_entry *h;
2598
2599 if (r_type != R_386_GOT32)
2600 continue;
2601
2602 /* Get the symbol referred to by the reloc. */
2603 if (r_symndx < symtab_hdr->sh_info)
2604 {
2605 Elf_Internal_Sym *isym;
2606
2607 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2608 abfd, r_symndx);
2609
2610 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2611 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2612 && bfd_get_8 (input_bfd,
2613 contents + irel->r_offset - 2) == 0x8b)
2614 {
2615 bfd_put_8 (output_bfd, 0x8d,
2616 contents + irel->r_offset - 2);
2617 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2618 if (local_got_refcounts != NULL
2619 && local_got_refcounts[r_symndx] > 0)
2620 local_got_refcounts[r_symndx] -= 1;
2621 changed_contents = TRUE;
2622 changed_relocs = TRUE;
2623 }
2624 continue;
2625 }
2626
2627 indx = r_symndx - symtab_hdr->sh_info;
2628 h = elf_sym_hashes (abfd)[indx];
2629 BFD_ASSERT (h != NULL);
2630
2631 while (h->root.type == bfd_link_hash_indirect
2632 || h->root.type == bfd_link_hash_warning)
2633 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2634
2635 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2636 optimizing _DYNAMIC since ld.so may use its link-time address. */
2637 if (h->def_regular
2638 && h->type != STT_GNU_IFUNC
2639 && h != htab->elf.hdynamic
2640 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2641 && bfd_get_8 (input_bfd,
2642 contents + irel->r_offset - 2) == 0x8b)
2643 {
2644 bfd_put_8 (output_bfd, 0x8d,
2645 contents + irel->r_offset - 2);
2646 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2647 if (h->got.refcount > 0)
2648 h->got.refcount -= 1;
2649 changed_contents = TRUE;
2650 changed_relocs = TRUE;
2651 }
2652 }
2653
2654 if (contents != NULL
2655 && elf_section_data (sec)->this_hdr.contents != contents)
2656 {
2657 if (!changed_contents && !link_info->keep_memory)
2658 free (contents);
2659 else
2660 {
2661 /* Cache the section contents for elf_link_input_bfd. */
2662 elf_section_data (sec)->this_hdr.contents = contents;
2663 }
2664 }
2665
2666 if (elf_section_data (sec)->relocs != internal_relocs)
2667 {
2668 if (!changed_relocs)
2669 free (internal_relocs);
2670 else
2671 elf_section_data (sec)->relocs = internal_relocs;
2672 }
2673
2674 return TRUE;
2675
2676 error_return:
2677 if (contents != NULL
2678 && elf_section_data (sec)->this_hdr.contents != contents)
2679 free (contents);
2680 if (internal_relocs != NULL
2681 && elf_section_data (sec)->relocs != internal_relocs)
2682 free (internal_relocs);
2683 return FALSE;
2684 }
2685
2686 /* Set the sizes of the dynamic sections. */
2687
2688 static bfd_boolean
2689 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2690 {
2691 struct elf_i386_link_hash_table *htab;
2692 bfd *dynobj;
2693 asection *s;
2694 bfd_boolean relocs;
2695 bfd *ibfd;
2696
2697 htab = elf_i386_hash_table (info);
2698 if (htab == NULL)
2699 return FALSE;
2700 dynobj = htab->elf.dynobj;
2701 if (dynobj == NULL)
2702 abort ();
2703
2704 if (htab->elf.dynamic_sections_created)
2705 {
2706 /* Set the contents of the .interp section to the interpreter. */
2707 if (info->executable)
2708 {
2709 s = bfd_get_linker_section (dynobj, ".interp");
2710 if (s == NULL)
2711 abort ();
2712 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2713 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2714 }
2715 }
2716
2717 /* Set up .got offsets for local syms, and space for local dynamic
2718 relocs. */
2719 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2720 {
2721 bfd_signed_vma *local_got;
2722 bfd_signed_vma *end_local_got;
2723 char *local_tls_type;
2724 bfd_vma *local_tlsdesc_gotent;
2725 bfd_size_type locsymcount;
2726 Elf_Internal_Shdr *symtab_hdr;
2727 asection *srel;
2728
2729 if (! is_i386_elf (ibfd))
2730 continue;
2731
2732 for (s = ibfd->sections; s != NULL; s = s->next)
2733 {
2734 struct elf_dyn_relocs *p;
2735
2736 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2737 return FALSE;
2738
2739 for (p = ((struct elf_dyn_relocs *)
2740 elf_section_data (s)->local_dynrel);
2741 p != NULL;
2742 p = p->next)
2743 {
2744 if (!bfd_is_abs_section (p->sec)
2745 && bfd_is_abs_section (p->sec->output_section))
2746 {
2747 /* Input section has been discarded, either because
2748 it is a copy of a linkonce section or due to
2749 linker script /DISCARD/, so we'll be discarding
2750 the relocs too. */
2751 }
2752 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2753 && strcmp (p->sec->output_section->name,
2754 ".tls_vars") == 0)
2755 {
2756 /* Relocations in vxworks .tls_vars sections are
2757 handled specially by the loader. */
2758 }
2759 else if (p->count != 0)
2760 {
2761 srel = elf_section_data (p->sec)->sreloc;
2762 srel->size += p->count * sizeof (Elf32_External_Rel);
2763 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2764 && (info->flags & DF_TEXTREL) == 0)
2765 {
2766 info->flags |= DF_TEXTREL;
2767 if (info->warn_shared_textrel && info->shared)
2768 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2769 p->sec->owner, p->sec);
2770 }
2771 }
2772 }
2773 }
2774
2775 local_got = elf_local_got_refcounts (ibfd);
2776 if (!local_got)
2777 continue;
2778
2779 symtab_hdr = &elf_symtab_hdr (ibfd);
2780 locsymcount = symtab_hdr->sh_info;
2781 end_local_got = local_got + locsymcount;
2782 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2783 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2784 s = htab->elf.sgot;
2785 srel = htab->elf.srelgot;
2786 for (; local_got < end_local_got;
2787 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2788 {
2789 *local_tlsdesc_gotent = (bfd_vma) -1;
2790 if (*local_got > 0)
2791 {
2792 if (GOT_TLS_GDESC_P (*local_tls_type))
2793 {
2794 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2795 - elf_i386_compute_jump_table_size (htab);
2796 htab->elf.sgotplt->size += 8;
2797 *local_got = (bfd_vma) -2;
2798 }
2799 if (! GOT_TLS_GDESC_P (*local_tls_type)
2800 || GOT_TLS_GD_P (*local_tls_type))
2801 {
2802 *local_got = s->size;
2803 s->size += 4;
2804 if (GOT_TLS_GD_P (*local_tls_type)
2805 || *local_tls_type == GOT_TLS_IE_BOTH)
2806 s->size += 4;
2807 }
2808 if (info->shared
2809 || GOT_TLS_GD_ANY_P (*local_tls_type)
2810 || (*local_tls_type & GOT_TLS_IE))
2811 {
2812 if (*local_tls_type == GOT_TLS_IE_BOTH)
2813 srel->size += 2 * sizeof (Elf32_External_Rel);
2814 else if (GOT_TLS_GD_P (*local_tls_type)
2815 || ! GOT_TLS_GDESC_P (*local_tls_type))
2816 srel->size += sizeof (Elf32_External_Rel);
2817 if (GOT_TLS_GDESC_P (*local_tls_type))
2818 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2819 }
2820 }
2821 else
2822 *local_got = (bfd_vma) -1;
2823 }
2824 }
2825
2826 if (htab->tls_ldm_got.refcount > 0)
2827 {
2828 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2829 relocs. */
2830 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2831 htab->elf.sgot->size += 8;
2832 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2833 }
2834 else
2835 htab->tls_ldm_got.offset = -1;
2836
2837 /* Allocate global sym .plt and .got entries, and space for global
2838 sym dynamic relocs. */
2839 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2840
2841 /* Allocate .plt and .got entries, and space for local symbols. */
2842 htab_traverse (htab->loc_hash_table,
2843 elf_i386_allocate_local_dynrelocs,
2844 info);
2845
2846 /* For every jump slot reserved in the sgotplt, reloc_count is
2847 incremented. However, when we reserve space for TLS descriptors,
2848 it's not incremented, so in order to compute the space reserved
2849 for them, it suffices to multiply the reloc count by the jump
2850 slot size.
2851
2852 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2853 so that R_386_IRELATIVE entries come last. */
2854 if (htab->elf.srelplt)
2855 {
2856 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2857 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2858 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2859 }
2860 else if (htab->elf.irelplt)
2861 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2862
2863
2864 if (htab->elf.sgotplt)
2865 {
2866 struct elf_link_hash_entry *got;
2867 got = elf_link_hash_lookup (elf_hash_table (info),
2868 "_GLOBAL_OFFSET_TABLE_",
2869 FALSE, FALSE, FALSE);
2870
2871 /* Don't allocate .got.plt section if there are no GOT nor PLT
2872 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2873 if ((got == NULL
2874 || !got->ref_regular_nonweak)
2875 && (htab->elf.sgotplt->size
2876 == get_elf_backend_data (output_bfd)->got_header_size)
2877 && (htab->elf.splt == NULL
2878 || htab->elf.splt->size == 0)
2879 && (htab->elf.sgot == NULL
2880 || htab->elf.sgot->size == 0)
2881 && (htab->elf.iplt == NULL
2882 || htab->elf.iplt->size == 0)
2883 && (htab->elf.igotplt == NULL
2884 || htab->elf.igotplt->size == 0))
2885 htab->elf.sgotplt->size = 0;
2886 }
2887
2888
2889 if (htab->plt_eh_frame != NULL
2890 && htab->elf.splt != NULL
2891 && htab->elf.splt->size != 0
2892 && !bfd_is_abs_section (htab->elf.splt->output_section)
2893 && _bfd_elf_eh_frame_present (info))
2894 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2895
2896 /* We now have determined the sizes of the various dynamic sections.
2897 Allocate memory for them. */
2898 relocs = FALSE;
2899 for (s = dynobj->sections; s != NULL; s = s->next)
2900 {
2901 bfd_boolean strip_section = TRUE;
2902
2903 if ((s->flags & SEC_LINKER_CREATED) == 0)
2904 continue;
2905
2906 if (s == htab->elf.splt
2907 || s == htab->elf.sgot)
2908 {
2909 /* Strip this section if we don't need it; see the
2910 comment below. */
2911 /* We'd like to strip these sections if they aren't needed, but if
2912 we've exported dynamic symbols from them we must leave them.
2913 It's too late to tell BFD to get rid of the symbols. */
2914
2915 if (htab->elf.hplt != NULL)
2916 strip_section = FALSE;
2917 }
2918 else if (s == htab->elf.sgotplt
2919 || s == htab->elf.iplt
2920 || s == htab->elf.igotplt
2921 || s == htab->plt_eh_frame
2922 || s == htab->sdynbss)
2923 {
2924 /* Strip these too. */
2925 }
2926 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2927 {
2928 if (s->size != 0
2929 && s != htab->elf.srelplt
2930 && s != htab->srelplt2)
2931 relocs = TRUE;
2932
2933 /* We use the reloc_count field as a counter if we need
2934 to copy relocs into the output file. */
2935 s->reloc_count = 0;
2936 }
2937 else
2938 {
2939 /* It's not one of our sections, so don't allocate space. */
2940 continue;
2941 }
2942
2943 if (s->size == 0)
2944 {
2945 /* If we don't need this section, strip it from the
2946 output file. This is mostly to handle .rel.bss and
2947 .rel.plt. We must create both sections in
2948 create_dynamic_sections, because they must be created
2949 before the linker maps input sections to output
2950 sections. The linker does that before
2951 adjust_dynamic_symbol is called, and it is that
2952 function which decides whether anything needs to go
2953 into these sections. */
2954 if (strip_section)
2955 s->flags |= SEC_EXCLUDE;
2956 continue;
2957 }
2958
2959 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2960 continue;
2961
2962 /* Allocate memory for the section contents. We use bfd_zalloc
2963 here in case unused entries are not reclaimed before the
2964 section's contents are written out. This should not happen,
2965 but this way if it does, we get a R_386_NONE reloc instead
2966 of garbage. */
2967 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2968 if (s->contents == NULL)
2969 return FALSE;
2970 }
2971
2972 if (htab->plt_eh_frame != NULL
2973 && htab->plt_eh_frame->contents != NULL)
2974 {
2975 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2976 sizeof (elf_i386_eh_frame_plt));
2977 bfd_put_32 (dynobj, htab->elf.splt->size,
2978 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2979 }
2980
2981 if (htab->elf.dynamic_sections_created)
2982 {
2983 /* Add some entries to the .dynamic section. We fill in the
2984 values later, in elf_i386_finish_dynamic_sections, but we
2985 must add the entries now so that we get the correct size for
2986 the .dynamic section. The DT_DEBUG entry is filled in by the
2987 dynamic linker and used by the debugger. */
2988 #define add_dynamic_entry(TAG, VAL) \
2989 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2990
2991 if (info->executable)
2992 {
2993 if (!add_dynamic_entry (DT_DEBUG, 0))
2994 return FALSE;
2995 }
2996
2997 if (htab->elf.splt->size != 0)
2998 {
2999 if (!add_dynamic_entry (DT_PLTGOT, 0)
3000 || !add_dynamic_entry (DT_PLTRELSZ, 0)
3001 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3002 || !add_dynamic_entry (DT_JMPREL, 0))
3003 return FALSE;
3004 }
3005
3006 if (relocs)
3007 {
3008 if (!add_dynamic_entry (DT_REL, 0)
3009 || !add_dynamic_entry (DT_RELSZ, 0)
3010 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3011 return FALSE;
3012
3013 /* If any dynamic relocs apply to a read-only section,
3014 then we need a DT_TEXTREL entry. */
3015 if ((info->flags & DF_TEXTREL) == 0)
3016 elf_link_hash_traverse (&htab->elf,
3017 elf_i386_readonly_dynrelocs, info);
3018
3019 if ((info->flags & DF_TEXTREL) != 0)
3020 {
3021 if (!add_dynamic_entry (DT_TEXTREL, 0))
3022 return FALSE;
3023 }
3024 }
3025 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3026 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3027 return FALSE;
3028 }
3029 #undef add_dynamic_entry
3030
3031 return TRUE;
3032 }
3033
3034 static bfd_boolean
3035 elf_i386_always_size_sections (bfd *output_bfd,
3036 struct bfd_link_info *info)
3037 {
3038 asection *tls_sec = elf_hash_table (info)->tls_sec;
3039
3040 if (tls_sec)
3041 {
3042 struct elf_link_hash_entry *tlsbase;
3043
3044 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3045 "_TLS_MODULE_BASE_",
3046 FALSE, FALSE, FALSE);
3047
3048 if (tlsbase && tlsbase->type == STT_TLS)
3049 {
3050 struct elf_i386_link_hash_table *htab;
3051 struct bfd_link_hash_entry *bh = NULL;
3052 const struct elf_backend_data *bed
3053 = get_elf_backend_data (output_bfd);
3054
3055 htab = elf_i386_hash_table (info);
3056 if (htab == NULL)
3057 return FALSE;
3058
3059 if (!(_bfd_generic_link_add_one_symbol
3060 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3061 tls_sec, 0, NULL, FALSE,
3062 bed->collect, &bh)))
3063 return FALSE;
3064
3065 htab->tls_module_base = bh;
3066
3067 tlsbase = (struct elf_link_hash_entry *)bh;
3068 tlsbase->def_regular = 1;
3069 tlsbase->other = STV_HIDDEN;
3070 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3071 }
3072 }
3073
3074 return TRUE;
3075 }
3076
3077 /* Set the correct type for an x86 ELF section. We do this by the
3078 section name, which is a hack, but ought to work. */
3079
3080 static bfd_boolean
3081 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3082 Elf_Internal_Shdr *hdr,
3083 asection *sec)
3084 {
3085 const char *name;
3086
3087 name = bfd_get_section_name (abfd, sec);
3088
3089 /* This is an ugly, but unfortunately necessary hack that is
3090 needed when producing EFI binaries on x86. It tells
3091 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3092 containing ELF relocation info. We need this hack in order to
3093 be able to generate ELF binaries that can be translated into
3094 EFI applications (which are essentially COFF objects). Those
3095 files contain a COFF ".reloc" section inside an ELFNN object,
3096 which would normally cause BFD to segfault because it would
3097 attempt to interpret this section as containing relocation
3098 entries for section "oc". With this hack enabled, ".reloc"
3099 will be treated as a normal data section, which will avoid the
3100 segfault. However, you won't be able to create an ELFNN binary
3101 with a section named "oc" that needs relocations, but that's
3102 the kind of ugly side-effects you get when detecting section
3103 types based on their names... In practice, this limitation is
3104 unlikely to bite. */
3105 if (strcmp (name, ".reloc") == 0)
3106 hdr->sh_type = SHT_PROGBITS;
3107
3108 return TRUE;
3109 }
3110
3111 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3112 executables. Rather than setting it to the beginning of the TLS
3113 section, we have to set it to the end. This function may be called
3114 multiple times, it is idempotent. */
3115
3116 static void
3117 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3118 {
3119 struct elf_i386_link_hash_table *htab;
3120 struct bfd_link_hash_entry *base;
3121
3122 if (!info->executable)
3123 return;
3124
3125 htab = elf_i386_hash_table (info);
3126 if (htab == NULL)
3127 return;
3128
3129 base = htab->tls_module_base;
3130 if (base == NULL)
3131 return;
3132
3133 base->u.def.value = htab->elf.tls_size;
3134 }
3135
3136 /* Return the base VMA address which should be subtracted from real addresses
3137 when resolving @dtpoff relocation.
3138 This is PT_TLS segment p_vaddr. */
3139
3140 static bfd_vma
3141 elf_i386_dtpoff_base (struct bfd_link_info *info)
3142 {
3143 /* If tls_sec is NULL, we should have signalled an error already. */
3144 if (elf_hash_table (info)->tls_sec == NULL)
3145 return 0;
3146 return elf_hash_table (info)->tls_sec->vma;
3147 }
3148
3149 /* Return the relocation value for @tpoff relocation
3150 if STT_TLS virtual address is ADDRESS. */
3151
3152 static bfd_vma
3153 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3154 {
3155 struct elf_link_hash_table *htab = elf_hash_table (info);
3156 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3157 bfd_vma static_tls_size;
3158
3159 /* If tls_sec is NULL, we should have signalled an error already. */
3160 if (htab->tls_sec == NULL)
3161 return 0;
3162
3163 /* Consider special static TLS alignment requirements. */
3164 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3165 return static_tls_size + htab->tls_sec->vma - address;
3166 }
3167
3168 /* Relocate an i386 ELF section. */
3169
3170 static bfd_boolean
3171 elf_i386_relocate_section (bfd *output_bfd,
3172 struct bfd_link_info *info,
3173 bfd *input_bfd,
3174 asection *input_section,
3175 bfd_byte *contents,
3176 Elf_Internal_Rela *relocs,
3177 Elf_Internal_Sym *local_syms,
3178 asection **local_sections)
3179 {
3180 struct elf_i386_link_hash_table *htab;
3181 Elf_Internal_Shdr *symtab_hdr;
3182 struct elf_link_hash_entry **sym_hashes;
3183 bfd_vma *local_got_offsets;
3184 bfd_vma *local_tlsdesc_gotents;
3185 Elf_Internal_Rela *rel;
3186 Elf_Internal_Rela *relend;
3187 bfd_boolean is_vxworks_tls;
3188 unsigned plt_entry_size;
3189
3190 BFD_ASSERT (is_i386_elf (input_bfd));
3191
3192 htab = elf_i386_hash_table (info);
3193 if (htab == NULL)
3194 return FALSE;
3195 symtab_hdr = &elf_symtab_hdr (input_bfd);
3196 sym_hashes = elf_sym_hashes (input_bfd);
3197 local_got_offsets = elf_local_got_offsets (input_bfd);
3198 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3199 /* We have to handle relocations in vxworks .tls_vars sections
3200 specially, because the dynamic loader is 'weird'. */
3201 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3202 && info->shared
3203 && !strcmp (input_section->output_section->name,
3204 ".tls_vars"));
3205
3206 elf_i386_set_tls_module_base (info);
3207
3208 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3209
3210 rel = relocs;
3211 relend = relocs + input_section->reloc_count;
3212 for (; rel < relend; rel++)
3213 {
3214 unsigned int r_type;
3215 reloc_howto_type *howto;
3216 unsigned long r_symndx;
3217 struct elf_link_hash_entry *h;
3218 Elf_Internal_Sym *sym;
3219 asection *sec;
3220 bfd_vma off, offplt;
3221 bfd_vma relocation;
3222 bfd_boolean unresolved_reloc;
3223 bfd_reloc_status_type r;
3224 unsigned int indx;
3225 int tls_type;
3226
3227 r_type = ELF32_R_TYPE (rel->r_info);
3228 if (r_type == R_386_GNU_VTINHERIT
3229 || r_type == R_386_GNU_VTENTRY)
3230 continue;
3231
3232 if ((indx = r_type) >= R_386_standard
3233 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3234 >= R_386_ext - R_386_standard)
3235 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3236 >= R_386_irelative - R_386_ext))
3237 {
3238 (*_bfd_error_handler)
3239 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3240 input_bfd, input_section, r_type);
3241 bfd_set_error (bfd_error_bad_value);
3242 return FALSE;
3243 }
3244 howto = elf_howto_table + indx;
3245
3246 r_symndx = ELF32_R_SYM (rel->r_info);
3247 h = NULL;
3248 sym = NULL;
3249 sec = NULL;
3250 unresolved_reloc = FALSE;
3251 if (r_symndx < symtab_hdr->sh_info)
3252 {
3253 sym = local_syms + r_symndx;
3254 sec = local_sections[r_symndx];
3255 relocation = (sec->output_section->vma
3256 + sec->output_offset
3257 + sym->st_value);
3258
3259 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3260 && ((sec->flags & SEC_MERGE) != 0
3261 || (info->relocatable
3262 && sec->output_offset != 0)))
3263 {
3264 bfd_vma addend;
3265 bfd_byte *where = contents + rel->r_offset;
3266
3267 switch (howto->size)
3268 {
3269 case 0:
3270 addend = bfd_get_8 (input_bfd, where);
3271 if (howto->pc_relative)
3272 {
3273 addend = (addend ^ 0x80) - 0x80;
3274 addend += 1;
3275 }
3276 break;
3277 case 1:
3278 addend = bfd_get_16 (input_bfd, where);
3279 if (howto->pc_relative)
3280 {
3281 addend = (addend ^ 0x8000) - 0x8000;
3282 addend += 2;
3283 }
3284 break;
3285 case 2:
3286 addend = bfd_get_32 (input_bfd, where);
3287 if (howto->pc_relative)
3288 {
3289 addend = (addend ^ 0x80000000) - 0x80000000;
3290 addend += 4;
3291 }
3292 break;
3293 default:
3294 abort ();
3295 }
3296
3297 if (info->relocatable)
3298 addend += sec->output_offset;
3299 else
3300 {
3301 asection *msec = sec;
3302 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3303 addend);
3304 addend -= relocation;
3305 addend += msec->output_section->vma + msec->output_offset;
3306 }
3307
3308 switch (howto->size)
3309 {
3310 case 0:
3311 /* FIXME: overflow checks. */
3312 if (howto->pc_relative)
3313 addend -= 1;
3314 bfd_put_8 (input_bfd, addend, where);
3315 break;
3316 case 1:
3317 if (howto->pc_relative)
3318 addend -= 2;
3319 bfd_put_16 (input_bfd, addend, where);
3320 break;
3321 case 2:
3322 if (howto->pc_relative)
3323 addend -= 4;
3324 bfd_put_32 (input_bfd, addend, where);
3325 break;
3326 }
3327 }
3328 else if (!info->relocatable
3329 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3330 {
3331 /* Relocate against local STT_GNU_IFUNC symbol. */
3332 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3333 FALSE);
3334 if (h == NULL)
3335 abort ();
3336
3337 /* Set STT_GNU_IFUNC symbol value. */
3338 h->root.u.def.value = sym->st_value;
3339 h->root.u.def.section = sec;
3340 }
3341 }
3342 else
3343 {
3344 bfd_boolean warned ATTRIBUTE_UNUSED;
3345
3346 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3347 r_symndx, symtab_hdr, sym_hashes,
3348 h, sec, relocation,
3349 unresolved_reloc, warned);
3350 }
3351
3352 if (sec != NULL && discarded_section (sec))
3353 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3354 rel, 1, relend, howto, 0, contents);
3355
3356 if (info->relocatable)
3357 continue;
3358
3359 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3360 it here if it is defined in a non-shared object. */
3361 if (h != NULL
3362 && h->type == STT_GNU_IFUNC
3363 && h->def_regular)
3364 {
3365 asection *plt, *gotplt, *base_got;
3366 bfd_vma plt_index;
3367 const char *name;
3368
3369 if ((input_section->flags & SEC_ALLOC) == 0
3370 || h->plt.offset == (bfd_vma) -1)
3371 abort ();
3372
3373 /* STT_GNU_IFUNC symbol must go through PLT. */
3374 if (htab->elf.splt != NULL)
3375 {
3376 plt = htab->elf.splt;
3377 gotplt = htab->elf.sgotplt;
3378 }
3379 else
3380 {
3381 plt = htab->elf.iplt;
3382 gotplt = htab->elf.igotplt;
3383 }
3384
3385 relocation = (plt->output_section->vma
3386 + plt->output_offset + h->plt.offset);
3387
3388 switch (r_type)
3389 {
3390 default:
3391 if (h->root.root.string)
3392 name = h->root.root.string;
3393 else
3394 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3395 NULL);
3396 (*_bfd_error_handler)
3397 (_("%B: relocation %s against STT_GNU_IFUNC "
3398 "symbol `%s' isn't handled by %s"), input_bfd,
3399 elf_howto_table[r_type].name,
3400 name, __FUNCTION__);
3401 bfd_set_error (bfd_error_bad_value);
3402 return FALSE;
3403
3404 case R_386_32:
3405 /* Generate dynamic relcoation only when there is a
3406 non-GOT reference in a shared object. */
3407 if (info->shared && h->non_got_ref)
3408 {
3409 Elf_Internal_Rela outrel;
3410 bfd_byte *loc;
3411 asection *sreloc;
3412 bfd_vma offset;
3413
3414 /* Need a dynamic relocation to get the real function
3415 adddress. */
3416 offset = _bfd_elf_section_offset (output_bfd,
3417 info,
3418 input_section,
3419 rel->r_offset);
3420 if (offset == (bfd_vma) -1
3421 || offset == (bfd_vma) -2)
3422 abort ();
3423
3424 outrel.r_offset = (input_section->output_section->vma
3425 + input_section->output_offset
3426 + offset);
3427
3428 if (h->dynindx == -1
3429 || h->forced_local
3430 || info->executable)
3431 {
3432 /* This symbol is resolved locally. */
3433 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3434 bfd_put_32 (output_bfd,
3435 (h->root.u.def.value
3436 + h->root.u.def.section->output_section->vma
3437 + h->root.u.def.section->output_offset),
3438 contents + offset);
3439 }
3440 else
3441 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3442
3443 sreloc = htab->elf.irelifunc;
3444 loc = sreloc->contents;
3445 loc += (sreloc->reloc_count++
3446 * sizeof (Elf32_External_Rel));
3447 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3448
3449 /* If this reloc is against an external symbol, we
3450 do not want to fiddle with the addend. Otherwise,
3451 we need to include the symbol value so that it
3452 becomes an addend for the dynamic reloc. For an
3453 internal symbol, we have updated addend. */
3454 continue;
3455 }
3456 /* FALLTHROUGH */
3457 case R_386_PC32:
3458 case R_386_PLT32:
3459 goto do_relocation;
3460
3461 case R_386_GOT32:
3462 base_got = htab->elf.sgot;
3463 off = h->got.offset;
3464
3465 if (base_got == NULL)
3466 abort ();
3467
3468 if (off == (bfd_vma) -1)
3469 {
3470 /* We can't use h->got.offset here to save state, or
3471 even just remember the offset, as finish_dynamic_symbol
3472 would use that as offset into .got. */
3473
3474 if (htab->elf.splt != NULL)
3475 {
3476 plt_index = h->plt.offset / plt_entry_size - 1;
3477 off = (plt_index + 3) * 4;
3478 base_got = htab->elf.sgotplt;
3479 }
3480 else
3481 {
3482 plt_index = h->plt.offset / plt_entry_size;
3483 off = plt_index * 4;
3484 base_got = htab->elf.igotplt;
3485 }
3486
3487 if (h->dynindx == -1
3488 || h->forced_local
3489 || info->symbolic)
3490 {
3491 /* This references the local defitionion. We must
3492 initialize this entry in the global offset table.
3493 Since the offset must always be a multiple of 8,
3494 we use the least significant bit to record
3495 whether we have initialized it already.
3496
3497 When doing a dynamic link, we create a .rela.got
3498 relocation entry to initialize the value. This
3499 is done in the finish_dynamic_symbol routine. */
3500 if ((off & 1) != 0)
3501 off &= ~1;
3502 else
3503 {
3504 bfd_put_32 (output_bfd, relocation,
3505 base_got->contents + off);
3506 h->got.offset |= 1;
3507 }
3508 }
3509
3510 relocation = off;
3511
3512 /* Adjust for static executables. */
3513 if (htab->elf.splt == NULL)
3514 relocation += gotplt->output_offset;
3515 }
3516 else
3517 {
3518 relocation = (base_got->output_section->vma
3519 + base_got->output_offset + off
3520 - gotplt->output_section->vma
3521 - gotplt->output_offset);
3522 /* Adjust for static executables. */
3523 if (htab->elf.splt == NULL)
3524 relocation += gotplt->output_offset;
3525 }
3526
3527 goto do_relocation;
3528
3529 case R_386_GOTOFF:
3530 relocation -= (gotplt->output_section->vma
3531 + gotplt->output_offset);
3532 goto do_relocation;
3533 }
3534 }
3535
3536 switch (r_type)
3537 {
3538 case R_386_GOT32:
3539 /* Relocation is to the entry for this symbol in the global
3540 offset table. */
3541 if (htab->elf.sgot == NULL)
3542 abort ();
3543
3544 if (h != NULL)
3545 {
3546 bfd_boolean dyn;
3547
3548 off = h->got.offset;
3549 dyn = htab->elf.dynamic_sections_created;
3550 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3551 || (info->shared
3552 && SYMBOL_REFERENCES_LOCAL (info, h))
3553 || (ELF_ST_VISIBILITY (h->other)
3554 && h->root.type == bfd_link_hash_undefweak))
3555 {
3556 /* This is actually a static link, or it is a
3557 -Bsymbolic link and the symbol is defined
3558 locally, or the symbol was forced to be local
3559 because of a version file. We must initialize
3560 this entry in the global offset table. Since the
3561 offset must always be a multiple of 4, we use the
3562 least significant bit to record whether we have
3563 initialized it already.
3564
3565 When doing a dynamic link, we create a .rel.got
3566 relocation entry to initialize the value. This
3567 is done in the finish_dynamic_symbol routine. */
3568 if ((off & 1) != 0)
3569 off &= ~1;
3570 else
3571 {
3572 bfd_put_32 (output_bfd, relocation,
3573 htab->elf.sgot->contents + off);
3574 h->got.offset |= 1;
3575 }
3576 }
3577 else
3578 unresolved_reloc = FALSE;
3579 }
3580 else
3581 {
3582 if (local_got_offsets == NULL)
3583 abort ();
3584
3585 off = local_got_offsets[r_symndx];
3586
3587 /* The offset must always be a multiple of 4. We use
3588 the least significant bit to record whether we have
3589 already generated the necessary reloc. */
3590 if ((off & 1) != 0)
3591 off &= ~1;
3592 else
3593 {
3594 bfd_put_32 (output_bfd, relocation,
3595 htab->elf.sgot->contents + off);
3596
3597 if (info->shared)
3598 {
3599 asection *s;
3600 Elf_Internal_Rela outrel;
3601 bfd_byte *loc;
3602
3603 s = htab->elf.srelgot;
3604 if (s == NULL)
3605 abort ();
3606
3607 outrel.r_offset = (htab->elf.sgot->output_section->vma
3608 + htab->elf.sgot->output_offset
3609 + off);
3610 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3611 loc = s->contents;
3612 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3613 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3614 }
3615
3616 local_got_offsets[r_symndx] |= 1;
3617 }
3618 }
3619
3620 if (off >= (bfd_vma) -2)
3621 abort ();
3622
3623 relocation = htab->elf.sgot->output_section->vma
3624 + htab->elf.sgot->output_offset + off
3625 - htab->elf.sgotplt->output_section->vma
3626 - htab->elf.sgotplt->output_offset;
3627 break;
3628
3629 case R_386_GOTOFF:
3630 /* Relocation is relative to the start of the global offset
3631 table. */
3632
3633 /* Check to make sure it isn't a protected function symbol
3634 for shared library since it may not be local when used
3635 as function address. We also need to make sure that a
3636 symbol is defined locally. */
3637 if (info->shared && h)
3638 {
3639 if (!h->def_regular)
3640 {
3641 const char *v;
3642
3643 switch (ELF_ST_VISIBILITY (h->other))
3644 {
3645 case STV_HIDDEN:
3646 v = _("hidden symbol");
3647 break;
3648 case STV_INTERNAL:
3649 v = _("internal symbol");
3650 break;
3651 case STV_PROTECTED:
3652 v = _("protected symbol");
3653 break;
3654 default:
3655 v = _("symbol");
3656 break;
3657 }
3658
3659 (*_bfd_error_handler)
3660 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3661 input_bfd, v, h->root.root.string);
3662 bfd_set_error (bfd_error_bad_value);
3663 return FALSE;
3664 }
3665 else if (!info->executable
3666 && !SYMBOLIC_BIND (info, h)
3667 && h->type == STT_FUNC
3668 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3669 {
3670 (*_bfd_error_handler)
3671 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3672 input_bfd, h->root.root.string);
3673 bfd_set_error (bfd_error_bad_value);
3674 return FALSE;
3675 }
3676 }
3677
3678 /* Note that sgot is not involved in this
3679 calculation. We always want the start of .got.plt. If we
3680 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3681 permitted by the ABI, we might have to change this
3682 calculation. */
3683 relocation -= htab->elf.sgotplt->output_section->vma
3684 + htab->elf.sgotplt->output_offset;
3685 break;
3686
3687 case R_386_GOTPC:
3688 /* Use global offset table as symbol value. */
3689 relocation = htab->elf.sgotplt->output_section->vma
3690 + htab->elf.sgotplt->output_offset;
3691 unresolved_reloc = FALSE;
3692 break;
3693
3694 case R_386_PLT32:
3695 /* Relocation is to the entry for this symbol in the
3696 procedure linkage table. */
3697
3698 /* Resolve a PLT32 reloc against a local symbol directly,
3699 without using the procedure linkage table. */
3700 if (h == NULL)
3701 break;
3702
3703 if (h->plt.offset == (bfd_vma) -1
3704 || htab->elf.splt == NULL)
3705 {
3706 /* We didn't make a PLT entry for this symbol. This
3707 happens when statically linking PIC code, or when
3708 using -Bsymbolic. */
3709 break;
3710 }
3711
3712 relocation = (htab->elf.splt->output_section->vma
3713 + htab->elf.splt->output_offset
3714 + h->plt.offset);
3715 unresolved_reloc = FALSE;
3716 break;
3717
3718 case R_386_32:
3719 case R_386_PC32:
3720 if ((input_section->flags & SEC_ALLOC) == 0
3721 || is_vxworks_tls)
3722 break;
3723
3724 if ((info->shared
3725 && (h == NULL
3726 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3727 || h->root.type != bfd_link_hash_undefweak)
3728 && (r_type != R_386_PC32
3729 || !SYMBOL_CALLS_LOCAL (info, h)))
3730 || (ELIMINATE_COPY_RELOCS
3731 && !info->shared
3732 && h != NULL
3733 && h->dynindx != -1
3734 && !h->non_got_ref
3735 && ((h->def_dynamic
3736 && !h->def_regular)
3737 || h->root.type == bfd_link_hash_undefweak
3738 || h->root.type == bfd_link_hash_undefined)))
3739 {
3740 Elf_Internal_Rela outrel;
3741 bfd_byte *loc;
3742 bfd_boolean skip, relocate;
3743 asection *sreloc;
3744
3745 /* When generating a shared object, these relocations
3746 are copied into the output file to be resolved at run
3747 time. */
3748
3749 skip = FALSE;
3750 relocate = FALSE;
3751
3752 outrel.r_offset =
3753 _bfd_elf_section_offset (output_bfd, info, input_section,
3754 rel->r_offset);
3755 if (outrel.r_offset == (bfd_vma) -1)
3756 skip = TRUE;
3757 else if (outrel.r_offset == (bfd_vma) -2)
3758 skip = TRUE, relocate = TRUE;
3759 outrel.r_offset += (input_section->output_section->vma
3760 + input_section->output_offset);
3761
3762 if (skip)
3763 memset (&outrel, 0, sizeof outrel);
3764 else if (h != NULL
3765 && h->dynindx != -1
3766 && (r_type == R_386_PC32
3767 || !info->shared
3768 || !SYMBOLIC_BIND (info, h)
3769 || !h->def_regular))
3770 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3771 else
3772 {
3773 /* This symbol is local, or marked to become local. */
3774 relocate = TRUE;
3775 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3776 }
3777
3778 sreloc = elf_section_data (input_section)->sreloc;
3779
3780 if (sreloc == NULL || sreloc->contents == NULL)
3781 {
3782 r = bfd_reloc_notsupported;
3783 goto check_relocation_error;
3784 }
3785
3786 loc = sreloc->contents;
3787 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3788
3789 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3790
3791 /* If this reloc is against an external symbol, we do
3792 not want to fiddle with the addend. Otherwise, we
3793 need to include the symbol value so that it becomes
3794 an addend for the dynamic reloc. */
3795 if (! relocate)
3796 continue;
3797 }
3798 break;
3799
3800 case R_386_TLS_IE:
3801 if (!info->executable)
3802 {
3803 Elf_Internal_Rela outrel;
3804 bfd_byte *loc;
3805 asection *sreloc;
3806
3807 outrel.r_offset = rel->r_offset
3808 + input_section->output_section->vma
3809 + input_section->output_offset;
3810 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3811 sreloc = elf_section_data (input_section)->sreloc;
3812 if (sreloc == NULL)
3813 abort ();
3814 loc = sreloc->contents;
3815 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3816 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3817 }
3818 /* Fall through */
3819
3820 case R_386_TLS_GD:
3821 case R_386_TLS_GOTDESC:
3822 case R_386_TLS_DESC_CALL:
3823 case R_386_TLS_IE_32:
3824 case R_386_TLS_GOTIE:
3825 tls_type = GOT_UNKNOWN;
3826 if (h == NULL && local_got_offsets)
3827 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3828 else if (h != NULL)
3829 tls_type = elf_i386_hash_entry(h)->tls_type;
3830 if (tls_type == GOT_TLS_IE)
3831 tls_type = GOT_TLS_IE_NEG;
3832
3833 if (! elf_i386_tls_transition (info, input_bfd,
3834 input_section, contents,
3835 symtab_hdr, sym_hashes,
3836 &r_type, tls_type, rel,
3837 relend, h, r_symndx))
3838 return FALSE;
3839
3840 if (r_type == R_386_TLS_LE_32)
3841 {
3842 BFD_ASSERT (! unresolved_reloc);
3843 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3844 {
3845 unsigned int type;
3846 bfd_vma roff;
3847
3848 /* GD->LE transition. */
3849 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3850 if (type == 0x04)
3851 {
3852 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3853 Change it into:
3854 movl %gs:0, %eax; subl $foo@tpoff, %eax
3855 (6 byte form of subl). */
3856 memcpy (contents + rel->r_offset - 3,
3857 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3858 roff = rel->r_offset + 5;
3859 }
3860 else
3861 {
3862 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3863 Change it into:
3864 movl %gs:0, %eax; subl $foo@tpoff, %eax
3865 (6 byte form of subl). */
3866 memcpy (contents + rel->r_offset - 2,
3867 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3868 roff = rel->r_offset + 6;
3869 }
3870 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3871 contents + roff);
3872 /* Skip R_386_PC32/R_386_PLT32. */
3873 rel++;
3874 continue;
3875 }
3876 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3877 {
3878 /* GDesc -> LE transition.
3879 It's originally something like:
3880 leal x@tlsdesc(%ebx), %eax
3881
3882 leal x@ntpoff, %eax
3883
3884 Registers other than %eax may be set up here. */
3885
3886 unsigned int val;
3887 bfd_vma roff;
3888
3889 roff = rel->r_offset;
3890 val = bfd_get_8 (input_bfd, contents + roff - 1);
3891
3892 /* Now modify the instruction as appropriate. */
3893 /* aoliva FIXME: remove the above and xor the byte
3894 below with 0x86. */
3895 bfd_put_8 (output_bfd, val ^ 0x86,
3896 contents + roff - 1);
3897 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3898 contents + roff);
3899 continue;
3900 }
3901 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3902 {
3903 /* GDesc -> LE transition.
3904 It's originally:
3905 call *(%eax)
3906 Turn it into:
3907 xchg %ax,%ax */
3908
3909 bfd_vma roff;
3910
3911 roff = rel->r_offset;
3912 bfd_put_8 (output_bfd, 0x66, contents + roff);
3913 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3914 continue;
3915 }
3916 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3917 {
3918 unsigned int val;
3919
3920 /* IE->LE transition:
3921 Originally it can be one of:
3922 movl foo, %eax
3923 movl foo, %reg
3924 addl foo, %reg
3925 We change it into:
3926 movl $foo, %eax
3927 movl $foo, %reg
3928 addl $foo, %reg. */
3929 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3930 if (val == 0xa1)
3931 {
3932 /* movl foo, %eax. */
3933 bfd_put_8 (output_bfd, 0xb8,
3934 contents + rel->r_offset - 1);
3935 }
3936 else
3937 {
3938 unsigned int type;
3939
3940 type = bfd_get_8 (input_bfd,
3941 contents + rel->r_offset - 2);
3942 switch (type)
3943 {
3944 case 0x8b:
3945 /* movl */
3946 bfd_put_8 (output_bfd, 0xc7,
3947 contents + rel->r_offset - 2);
3948 bfd_put_8 (output_bfd,
3949 0xc0 | ((val >> 3) & 7),
3950 contents + rel->r_offset - 1);
3951 break;
3952 case 0x03:
3953 /* addl */
3954 bfd_put_8 (output_bfd, 0x81,
3955 contents + rel->r_offset - 2);
3956 bfd_put_8 (output_bfd,
3957 0xc0 | ((val >> 3) & 7),
3958 contents + rel->r_offset - 1);
3959 break;
3960 default:
3961 BFD_FAIL ();
3962 break;
3963 }
3964 }
3965 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3966 contents + rel->r_offset);
3967 continue;
3968 }
3969 else
3970 {
3971 unsigned int val, type;
3972
3973 /* {IE_32,GOTIE}->LE transition:
3974 Originally it can be one of:
3975 subl foo(%reg1), %reg2
3976 movl foo(%reg1), %reg2
3977 addl foo(%reg1), %reg2
3978 We change it into:
3979 subl $foo, %reg2
3980 movl $foo, %reg2 (6 byte form)
3981 addl $foo, %reg2. */
3982 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3983 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3984 if (type == 0x8b)
3985 {
3986 /* movl */
3987 bfd_put_8 (output_bfd, 0xc7,
3988 contents + rel->r_offset - 2);
3989 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3990 contents + rel->r_offset - 1);
3991 }
3992 else if (type == 0x2b)
3993 {
3994 /* subl */
3995 bfd_put_8 (output_bfd, 0x81,
3996 contents + rel->r_offset - 2);
3997 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3998 contents + rel->r_offset - 1);
3999 }
4000 else if (type == 0x03)
4001 {
4002 /* addl */
4003 bfd_put_8 (output_bfd, 0x81,
4004 contents + rel->r_offset - 2);
4005 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4006 contents + rel->r_offset - 1);
4007 }
4008 else
4009 BFD_FAIL ();
4010 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4011 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4012 contents + rel->r_offset);
4013 else
4014 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4015 contents + rel->r_offset);
4016 continue;
4017 }
4018 }
4019
4020 if (htab->elf.sgot == NULL)
4021 abort ();
4022
4023 if (h != NULL)
4024 {
4025 off = h->got.offset;
4026 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4027 }
4028 else
4029 {
4030 if (local_got_offsets == NULL)
4031 abort ();
4032
4033 off = local_got_offsets[r_symndx];
4034 offplt = local_tlsdesc_gotents[r_symndx];
4035 }
4036
4037 if ((off & 1) != 0)
4038 off &= ~1;
4039 else
4040 {
4041 Elf_Internal_Rela outrel;
4042 bfd_byte *loc;
4043 int dr_type;
4044 asection *sreloc;
4045
4046 if (htab->elf.srelgot == NULL)
4047 abort ();
4048
4049 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4050
4051 if (GOT_TLS_GDESC_P (tls_type))
4052 {
4053 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4054 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4055 <= htab->elf.sgotplt->size);
4056 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4057 + htab->elf.sgotplt->output_offset
4058 + offplt
4059 + htab->sgotplt_jump_table_size);
4060 sreloc = htab->elf.srelplt;
4061 loc = sreloc->contents;
4062 loc += (htab->next_tls_desc_index++
4063 * sizeof (Elf32_External_Rel));
4064 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4065 <= sreloc->contents + sreloc->size);
4066 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4067 if (indx == 0)
4068 {
4069 BFD_ASSERT (! unresolved_reloc);
4070 bfd_put_32 (output_bfd,
4071 relocation - elf_i386_dtpoff_base (info),
4072 htab->elf.sgotplt->contents + offplt
4073 + htab->sgotplt_jump_table_size + 4);
4074 }
4075 else
4076 {
4077 bfd_put_32 (output_bfd, 0,
4078 htab->elf.sgotplt->contents + offplt
4079 + htab->sgotplt_jump_table_size + 4);
4080 }
4081 }
4082
4083 sreloc = htab->elf.srelgot;
4084
4085 outrel.r_offset = (htab->elf.sgot->output_section->vma
4086 + htab->elf.sgot->output_offset + off);
4087
4088 if (GOT_TLS_GD_P (tls_type))
4089 dr_type = R_386_TLS_DTPMOD32;
4090 else if (GOT_TLS_GDESC_P (tls_type))
4091 goto dr_done;
4092 else if (tls_type == GOT_TLS_IE_POS)
4093 dr_type = R_386_TLS_TPOFF;
4094 else
4095 dr_type = R_386_TLS_TPOFF32;
4096
4097 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4098 bfd_put_32 (output_bfd,
4099 relocation - elf_i386_dtpoff_base (info),
4100 htab->elf.sgot->contents + off);
4101 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4102 bfd_put_32 (output_bfd,
4103 elf_i386_dtpoff_base (info) - relocation,
4104 htab->elf.sgot->contents + off);
4105 else if (dr_type != R_386_TLS_DESC)
4106 bfd_put_32 (output_bfd, 0,
4107 htab->elf.sgot->contents + off);
4108 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4109
4110 loc = sreloc->contents;
4111 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4112 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4113 <= sreloc->contents + sreloc->size);
4114 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4115
4116 if (GOT_TLS_GD_P (tls_type))
4117 {
4118 if (indx == 0)
4119 {
4120 BFD_ASSERT (! unresolved_reloc);
4121 bfd_put_32 (output_bfd,
4122 relocation - elf_i386_dtpoff_base (info),
4123 htab->elf.sgot->contents + off + 4);
4124 }
4125 else
4126 {
4127 bfd_put_32 (output_bfd, 0,
4128 htab->elf.sgot->contents + off + 4);
4129 outrel.r_info = ELF32_R_INFO (indx,
4130 R_386_TLS_DTPOFF32);
4131 outrel.r_offset += 4;
4132 sreloc->reloc_count++;
4133 loc += sizeof (Elf32_External_Rel);
4134 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4135 <= sreloc->contents + sreloc->size);
4136 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4137 }
4138 }
4139 else if (tls_type == GOT_TLS_IE_BOTH)
4140 {
4141 bfd_put_32 (output_bfd,
4142 (indx == 0
4143 ? relocation - elf_i386_dtpoff_base (info)
4144 : 0),
4145 htab->elf.sgot->contents + off + 4);
4146 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4147 outrel.r_offset += 4;
4148 sreloc->reloc_count++;
4149 loc += sizeof (Elf32_External_Rel);
4150 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4151 }
4152
4153 dr_done:
4154 if (h != NULL)
4155 h->got.offset |= 1;
4156 else
4157 local_got_offsets[r_symndx] |= 1;
4158 }
4159
4160 if (off >= (bfd_vma) -2
4161 && ! GOT_TLS_GDESC_P (tls_type))
4162 abort ();
4163 if (r_type == R_386_TLS_GOTDESC
4164 || r_type == R_386_TLS_DESC_CALL)
4165 {
4166 relocation = htab->sgotplt_jump_table_size + offplt;
4167 unresolved_reloc = FALSE;
4168 }
4169 else if (r_type == ELF32_R_TYPE (rel->r_info))
4170 {
4171 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4172 + htab->elf.sgotplt->output_offset;
4173 relocation = htab->elf.sgot->output_section->vma
4174 + htab->elf.sgot->output_offset + off - g_o_t;
4175 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4176 && tls_type == GOT_TLS_IE_BOTH)
4177 relocation += 4;
4178 if (r_type == R_386_TLS_IE)
4179 relocation += g_o_t;
4180 unresolved_reloc = FALSE;
4181 }
4182 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4183 {
4184 unsigned int val, type;
4185 bfd_vma roff;
4186
4187 /* GD->IE transition. */
4188 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4189 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4190 if (type == 0x04)
4191 {
4192 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4193 Change it into:
4194 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4195 val >>= 3;
4196 roff = rel->r_offset - 3;
4197 }
4198 else
4199 {
4200 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4201 Change it into:
4202 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4203 roff = rel->r_offset - 2;
4204 }
4205 memcpy (contents + roff,
4206 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4207 contents[roff + 7] = 0x80 | (val & 7);
4208 /* If foo is used only with foo@gotntpoff(%reg) and
4209 foo@indntpoff, but not with foo@gottpoff(%reg), change
4210 subl $foo@gottpoff(%reg), %eax
4211 into:
4212 addl $foo@gotntpoff(%reg), %eax. */
4213 if (tls_type == GOT_TLS_IE_POS)
4214 contents[roff + 6] = 0x03;
4215 bfd_put_32 (output_bfd,
4216 htab->elf.sgot->output_section->vma
4217 + htab->elf.sgot->output_offset + off
4218 - htab->elf.sgotplt->output_section->vma
4219 - htab->elf.sgotplt->output_offset,
4220 contents + roff + 8);
4221 /* Skip R_386_PLT32. */
4222 rel++;
4223 continue;
4224 }
4225 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4226 {
4227 /* GDesc -> IE transition.
4228 It's originally something like:
4229 leal x@tlsdesc(%ebx), %eax
4230
4231 Change it to:
4232 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4233 or:
4234 movl x@gottpoff(%ebx), %eax # before negl %eax
4235
4236 Registers other than %eax may be set up here. */
4237
4238 bfd_vma roff;
4239
4240 /* First, make sure it's a leal adding ebx to a 32-bit
4241 offset into any register, although it's probably
4242 almost always going to be eax. */
4243 roff = rel->r_offset;
4244
4245 /* Now modify the instruction as appropriate. */
4246 /* To turn a leal into a movl in the form we use it, it
4247 suffices to change the first byte from 0x8d to 0x8b.
4248 aoliva FIXME: should we decide to keep the leal, all
4249 we have to do is remove the statement below, and
4250 adjust the relaxation of R_386_TLS_DESC_CALL. */
4251 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4252
4253 if (tls_type == GOT_TLS_IE_BOTH)
4254 off += 4;
4255
4256 bfd_put_32 (output_bfd,
4257 htab->elf.sgot->output_section->vma
4258 + htab->elf.sgot->output_offset + off
4259 - htab->elf.sgotplt->output_section->vma
4260 - htab->elf.sgotplt->output_offset,
4261 contents + roff);
4262 continue;
4263 }
4264 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4265 {
4266 /* GDesc -> IE transition.
4267 It's originally:
4268 call *(%eax)
4269
4270 Change it to:
4271 xchg %ax,%ax
4272 or
4273 negl %eax
4274 depending on how we transformed the TLS_GOTDESC above.
4275 */
4276
4277 bfd_vma roff;
4278
4279 roff = rel->r_offset;
4280
4281 /* Now modify the instruction as appropriate. */
4282 if (tls_type != GOT_TLS_IE_NEG)
4283 {
4284 /* xchg %ax,%ax */
4285 bfd_put_8 (output_bfd, 0x66, contents + roff);
4286 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4287 }
4288 else
4289 {
4290 /* negl %eax */
4291 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4292 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4293 }
4294
4295 continue;
4296 }
4297 else
4298 BFD_ASSERT (FALSE);
4299 break;
4300
4301 case R_386_TLS_LDM:
4302 if (! elf_i386_tls_transition (info, input_bfd,
4303 input_section, contents,
4304 symtab_hdr, sym_hashes,
4305 &r_type, GOT_UNKNOWN, rel,
4306 relend, h, r_symndx))
4307 return FALSE;
4308
4309 if (r_type != R_386_TLS_LDM)
4310 {
4311 /* LD->LE transition:
4312 leal foo(%reg), %eax; call ___tls_get_addr.
4313 We change it into:
4314 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4315 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4316 memcpy (contents + rel->r_offset - 2,
4317 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4318 /* Skip R_386_PC32/R_386_PLT32. */
4319 rel++;
4320 continue;
4321 }
4322
4323 if (htab->elf.sgot == NULL)
4324 abort ();
4325
4326 off = htab->tls_ldm_got.offset;
4327 if (off & 1)
4328 off &= ~1;
4329 else
4330 {
4331 Elf_Internal_Rela outrel;
4332 bfd_byte *loc;
4333
4334 if (htab->elf.srelgot == NULL)
4335 abort ();
4336
4337 outrel.r_offset = (htab->elf.sgot->output_section->vma
4338 + htab->elf.sgot->output_offset + off);
4339
4340 bfd_put_32 (output_bfd, 0,
4341 htab->elf.sgot->contents + off);
4342 bfd_put_32 (output_bfd, 0,
4343 htab->elf.sgot->contents + off + 4);
4344 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4345 loc = htab->elf.srelgot->contents;
4346 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4347 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4348 htab->tls_ldm_got.offset |= 1;
4349 }
4350 relocation = htab->elf.sgot->output_section->vma
4351 + htab->elf.sgot->output_offset + off
4352 - htab->elf.sgotplt->output_section->vma
4353 - htab->elf.sgotplt->output_offset;
4354 unresolved_reloc = FALSE;
4355 break;
4356
4357 case R_386_TLS_LDO_32:
4358 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4359 relocation -= elf_i386_dtpoff_base (info);
4360 else
4361 /* When converting LDO to LE, we must negate. */
4362 relocation = -elf_i386_tpoff (info, relocation);
4363 break;
4364
4365 case R_386_TLS_LE_32:
4366 case R_386_TLS_LE:
4367 if (!info->executable)
4368 {
4369 Elf_Internal_Rela outrel;
4370 asection *sreloc;
4371 bfd_byte *loc;
4372
4373 outrel.r_offset = rel->r_offset
4374 + input_section->output_section->vma
4375 + input_section->output_offset;
4376 if (h != NULL && h->dynindx != -1)
4377 indx = h->dynindx;
4378 else
4379 indx = 0;
4380 if (r_type == R_386_TLS_LE_32)
4381 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4382 else
4383 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4384 sreloc = elf_section_data (input_section)->sreloc;
4385 if (sreloc == NULL)
4386 abort ();
4387 loc = sreloc->contents;
4388 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4389 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4390 if (indx)
4391 continue;
4392 else if (r_type == R_386_TLS_LE_32)
4393 relocation = elf_i386_dtpoff_base (info) - relocation;
4394 else
4395 relocation -= elf_i386_dtpoff_base (info);
4396 }
4397 else if (r_type == R_386_TLS_LE_32)
4398 relocation = elf_i386_tpoff (info, relocation);
4399 else
4400 relocation = -elf_i386_tpoff (info, relocation);
4401 break;
4402
4403 default:
4404 break;
4405 }
4406
4407 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4408 because such sections are not SEC_ALLOC and thus ld.so will
4409 not process them. */
4410 if (unresolved_reloc
4411 && !((input_section->flags & SEC_DEBUGGING) != 0
4412 && h->def_dynamic)
4413 && _bfd_elf_section_offset (output_bfd, info, input_section,
4414 rel->r_offset) != (bfd_vma) -1)
4415 {
4416 (*_bfd_error_handler)
4417 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4418 input_bfd,
4419 input_section,
4420 (long) rel->r_offset,
4421 howto->name,
4422 h->root.root.string);
4423 return FALSE;
4424 }
4425
4426 do_relocation:
4427 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4428 contents, rel->r_offset,
4429 relocation, 0);
4430
4431 check_relocation_error:
4432 if (r != bfd_reloc_ok)
4433 {
4434 const char *name;
4435
4436 if (h != NULL)
4437 name = h->root.root.string;
4438 else
4439 {
4440 name = bfd_elf_string_from_elf_section (input_bfd,
4441 symtab_hdr->sh_link,
4442 sym->st_name);
4443 if (name == NULL)
4444 return FALSE;
4445 if (*name == '\0')
4446 name = bfd_section_name (input_bfd, sec);
4447 }
4448
4449 if (r == bfd_reloc_overflow)
4450 {
4451 if (! ((*info->callbacks->reloc_overflow)
4452 (info, (h ? &h->root : NULL), name, howto->name,
4453 (bfd_vma) 0, input_bfd, input_section,
4454 rel->r_offset)))
4455 return FALSE;
4456 }
4457 else
4458 {
4459 (*_bfd_error_handler)
4460 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4461 input_bfd, input_section,
4462 (long) rel->r_offset, name, (int) r);
4463 return FALSE;
4464 }
4465 }
4466 }
4467
4468 return TRUE;
4469 }
4470
4471 /* Finish up dynamic symbol handling. We set the contents of various
4472 dynamic sections here. */
4473
4474 static bfd_boolean
4475 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4476 struct bfd_link_info *info,
4477 struct elf_link_hash_entry *h,
4478 Elf_Internal_Sym *sym)
4479 {
4480 struct elf_i386_link_hash_table *htab;
4481 unsigned plt_entry_size;
4482 const struct elf_i386_backend_data *abed;
4483
4484 htab = elf_i386_hash_table (info);
4485 if (htab == NULL)
4486 return FALSE;
4487
4488 abed = get_elf_i386_backend_data (output_bfd);
4489 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4490
4491 if (h->plt.offset != (bfd_vma) -1)
4492 {
4493 bfd_vma plt_index;
4494 bfd_vma got_offset;
4495 Elf_Internal_Rela rel;
4496 bfd_byte *loc;
4497 asection *plt, *gotplt, *relplt;
4498
4499 /* When building a static executable, use .iplt, .igot.plt and
4500 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4501 if (htab->elf.splt != NULL)
4502 {
4503 plt = htab->elf.splt;
4504 gotplt = htab->elf.sgotplt;
4505 relplt = htab->elf.srelplt;
4506 }
4507 else
4508 {
4509 plt = htab->elf.iplt;
4510 gotplt = htab->elf.igotplt;
4511 relplt = htab->elf.irelplt;
4512 }
4513
4514 /* This symbol has an entry in the procedure linkage table. Set
4515 it up. */
4516
4517 if ((h->dynindx == -1
4518 && !((h->forced_local || info->executable)
4519 && h->def_regular
4520 && h->type == STT_GNU_IFUNC))
4521 || plt == NULL
4522 || gotplt == NULL
4523 || relplt == NULL)
4524 abort ();
4525
4526 /* Get the index in the procedure linkage table which
4527 corresponds to this symbol. This is the index of this symbol
4528 in all the symbols for which we are making plt entries. The
4529 first entry in the procedure linkage table is reserved.
4530
4531 Get the offset into the .got table of the entry that
4532 corresponds to this function. Each .got entry is 4 bytes.
4533 The first three are reserved.
4534
4535 For static executables, we don't reserve anything. */
4536
4537 if (plt == htab->elf.splt)
4538 {
4539 got_offset = h->plt.offset / plt_entry_size - 1;
4540 got_offset = (got_offset + 3) * 4;
4541 }
4542 else
4543 {
4544 got_offset = h->plt.offset / plt_entry_size;
4545 got_offset = got_offset * 4;
4546 }
4547
4548 /* Fill in the entry in the procedure linkage table. */
4549 if (! info->shared)
4550 {
4551 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4552 abed->plt->plt_entry_size);
4553 bfd_put_32 (output_bfd,
4554 (gotplt->output_section->vma
4555 + gotplt->output_offset
4556 + got_offset),
4557 plt->contents + h->plt.offset
4558 + abed->plt->plt_got_offset);
4559
4560 if (abed->is_vxworks)
4561 {
4562 int s, k, reloc_index;
4563
4564 /* Create the R_386_32 relocation referencing the GOT
4565 for this PLT entry. */
4566
4567 /* S: Current slot number (zero-based). */
4568 s = ((h->plt.offset - abed->plt->plt_entry_size)
4569 / abed->plt->plt_entry_size);
4570 /* K: Number of relocations for PLTResolve. */
4571 if (info->shared)
4572 k = PLTRESOLVE_RELOCS_SHLIB;
4573 else
4574 k = PLTRESOLVE_RELOCS;
4575 /* Skip the PLTresolve relocations, and the relocations for
4576 the other PLT slots. */
4577 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4578 loc = (htab->srelplt2->contents + reloc_index
4579 * sizeof (Elf32_External_Rel));
4580
4581 rel.r_offset = (htab->elf.splt->output_section->vma
4582 + htab->elf.splt->output_offset
4583 + h->plt.offset + 2),
4584 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4585 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4586
4587 /* Create the R_386_32 relocation referencing the beginning of
4588 the PLT for this GOT entry. */
4589 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4590 + htab->elf.sgotplt->output_offset
4591 + got_offset);
4592 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4593 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4594 loc + sizeof (Elf32_External_Rel));
4595 }
4596 }
4597 else
4598 {
4599 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4600 abed->plt->plt_entry_size);
4601 bfd_put_32 (output_bfd, got_offset,
4602 plt->contents + h->plt.offset
4603 + abed->plt->plt_got_offset);
4604 }
4605
4606 /* Fill in the entry in the global offset table. */
4607 bfd_put_32 (output_bfd,
4608 (plt->output_section->vma
4609 + plt->output_offset
4610 + h->plt.offset
4611 + abed->plt->plt_lazy_offset),
4612 gotplt->contents + got_offset);
4613
4614 /* Fill in the entry in the .rel.plt section. */
4615 rel.r_offset = (gotplt->output_section->vma
4616 + gotplt->output_offset
4617 + got_offset);
4618 if (h->dynindx == -1
4619 || ((info->executable
4620 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4621 && h->def_regular
4622 && h->type == STT_GNU_IFUNC))
4623 {
4624 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4625 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4626 in the .got.plt section. */
4627 bfd_put_32 (output_bfd,
4628 (h->root.u.def.value
4629 + h->root.u.def.section->output_section->vma
4630 + h->root.u.def.section->output_offset),
4631 gotplt->contents + got_offset);
4632 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4633 /* R_386_IRELATIVE comes last. */
4634 plt_index = htab->next_irelative_index--;
4635 }
4636 else
4637 {
4638 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4639 plt_index = htab->next_jump_slot_index++;
4640 }
4641 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4642 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4643
4644 /* Don't fill PLT entry for static executables. */
4645 if (plt == htab->elf.splt)
4646 {
4647 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4648 plt->contents + h->plt.offset
4649 + abed->plt->plt_reloc_offset);
4650 bfd_put_32 (output_bfd, - (h->plt.offset
4651 + abed->plt->plt_plt_offset + 4),
4652 plt->contents + h->plt.offset
4653 + abed->plt->plt_plt_offset);
4654 }
4655
4656 if (!h->def_regular)
4657 {
4658 /* Mark the symbol as undefined, rather than as defined in
4659 the .plt section. Leave the value if there were any
4660 relocations where pointer equality matters (this is a clue
4661 for the dynamic linker, to make function pointer
4662 comparisons work between an application and shared
4663 library), otherwise set it to zero. If a function is only
4664 called from a binary, there is no need to slow down
4665 shared libraries because of that. */
4666 sym->st_shndx = SHN_UNDEF;
4667 if (!h->pointer_equality_needed)
4668 sym->st_value = 0;
4669 }
4670 }
4671
4672 if (h->got.offset != (bfd_vma) -1
4673 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4674 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4675 {
4676 Elf_Internal_Rela rel;
4677 bfd_byte *loc;
4678
4679 /* This symbol has an entry in the global offset table. Set it
4680 up. */
4681
4682 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4683 abort ();
4684
4685 rel.r_offset = (htab->elf.sgot->output_section->vma
4686 + htab->elf.sgot->output_offset
4687 + (h->got.offset & ~(bfd_vma) 1));
4688
4689 /* If this is a static link, or it is a -Bsymbolic link and the
4690 symbol is defined locally or was forced to be local because
4691 of a version file, we just want to emit a RELATIVE reloc.
4692 The entry in the global offset table will already have been
4693 initialized in the relocate_section function. */
4694 if (h->def_regular
4695 && h->type == STT_GNU_IFUNC)
4696 {
4697 if (info->shared)
4698 {
4699 /* Generate R_386_GLOB_DAT. */
4700 goto do_glob_dat;
4701 }
4702 else
4703 {
4704 asection *plt;
4705
4706 if (!h->pointer_equality_needed)
4707 abort ();
4708
4709 /* For non-shared object, we can't use .got.plt, which
4710 contains the real function addres if we need pointer
4711 equality. We load the GOT entry with the PLT entry. */
4712 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4713 bfd_put_32 (output_bfd,
4714 (plt->output_section->vma
4715 + plt->output_offset + h->plt.offset),
4716 htab->elf.sgot->contents + h->got.offset);
4717 return TRUE;
4718 }
4719 }
4720 else if (info->shared
4721 && SYMBOL_REFERENCES_LOCAL (info, h))
4722 {
4723 BFD_ASSERT((h->got.offset & 1) != 0);
4724 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4725 }
4726 else
4727 {
4728 BFD_ASSERT((h->got.offset & 1) == 0);
4729 do_glob_dat:
4730 bfd_put_32 (output_bfd, (bfd_vma) 0,
4731 htab->elf.sgot->contents + h->got.offset);
4732 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4733 }
4734
4735 loc = htab->elf.srelgot->contents;
4736 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4737 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4738 }
4739
4740 if (h->needs_copy)
4741 {
4742 Elf_Internal_Rela rel;
4743 bfd_byte *loc;
4744
4745 /* This symbol needs a copy reloc. Set it up. */
4746
4747 if (h->dynindx == -1
4748 || (h->root.type != bfd_link_hash_defined
4749 && h->root.type != bfd_link_hash_defweak)
4750 || htab->srelbss == NULL)
4751 abort ();
4752
4753 rel.r_offset = (h->root.u.def.value
4754 + h->root.u.def.section->output_section->vma
4755 + h->root.u.def.section->output_offset);
4756 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4757 loc = htab->srelbss->contents;
4758 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4759 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4760 }
4761
4762 return TRUE;
4763 }
4764
4765 /* Finish up local dynamic symbol handling. We set the contents of
4766 various dynamic sections here. */
4767
4768 static bfd_boolean
4769 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4770 {
4771 struct elf_link_hash_entry *h
4772 = (struct elf_link_hash_entry *) *slot;
4773 struct bfd_link_info *info
4774 = (struct bfd_link_info *) inf;
4775
4776 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4777 h, NULL);
4778 }
4779
4780 /* Used to decide how to sort relocs in an optimal manner for the
4781 dynamic linker, before writing them out. */
4782
4783 static enum elf_reloc_type_class
4784 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4785 {
4786 switch (ELF32_R_TYPE (rela->r_info))
4787 {
4788 case R_386_RELATIVE:
4789 return reloc_class_relative;
4790 case R_386_JUMP_SLOT:
4791 return reloc_class_plt;
4792 case R_386_COPY:
4793 return reloc_class_copy;
4794 default:
4795 return reloc_class_normal;
4796 }
4797 }
4798
4799 /* Finish up the dynamic sections. */
4800
4801 static bfd_boolean
4802 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4803 struct bfd_link_info *info)
4804 {
4805 struct elf_i386_link_hash_table *htab;
4806 bfd *dynobj;
4807 asection *sdyn;
4808 const struct elf_i386_backend_data *abed;
4809
4810 htab = elf_i386_hash_table (info);
4811 if (htab == NULL)
4812 return FALSE;
4813
4814 dynobj = htab->elf.dynobj;
4815 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4816 abed = get_elf_i386_backend_data (output_bfd);
4817
4818 if (htab->elf.dynamic_sections_created)
4819 {
4820 Elf32_External_Dyn *dyncon, *dynconend;
4821
4822 if (sdyn == NULL || htab->elf.sgot == NULL)
4823 abort ();
4824
4825 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4826 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4827 for (; dyncon < dynconend; dyncon++)
4828 {
4829 Elf_Internal_Dyn dyn;
4830 asection *s;
4831
4832 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4833
4834 switch (dyn.d_tag)
4835 {
4836 default:
4837 if (abed->is_vxworks
4838 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4839 break;
4840 continue;
4841
4842 case DT_PLTGOT:
4843 s = htab->elf.sgotplt;
4844 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4845 break;
4846
4847 case DT_JMPREL:
4848 s = htab->elf.srelplt;
4849 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4850 break;
4851
4852 case DT_PLTRELSZ:
4853 s = htab->elf.srelplt;
4854 dyn.d_un.d_val = s->size;
4855 break;
4856
4857 case DT_RELSZ:
4858 /* My reading of the SVR4 ABI indicates that the
4859 procedure linkage table relocs (DT_JMPREL) should be
4860 included in the overall relocs (DT_REL). This is
4861 what Solaris does. However, UnixWare can not handle
4862 that case. Therefore, we override the DT_RELSZ entry
4863 here to make it not include the JMPREL relocs. */
4864 s = htab->elf.srelplt;
4865 if (s == NULL)
4866 continue;
4867 dyn.d_un.d_val -= s->size;
4868 break;
4869
4870 case DT_REL:
4871 /* We may not be using the standard ELF linker script.
4872 If .rel.plt is the first .rel section, we adjust
4873 DT_REL to not include it. */
4874 s = htab->elf.srelplt;
4875 if (s == NULL)
4876 continue;
4877 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4878 continue;
4879 dyn.d_un.d_ptr += s->size;
4880 break;
4881 }
4882
4883 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4884 }
4885
4886 /* Fill in the first entry in the procedure linkage table. */
4887 if (htab->elf.splt && htab->elf.splt->size > 0)
4888 {
4889 if (info->shared)
4890 {
4891 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4892 abed->plt->plt0_entry_size);
4893 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4894 abed->plt0_pad_byte,
4895 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4896 }
4897 else
4898 {
4899 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4900 abed->plt->plt0_entry_size);
4901 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4902 abed->plt0_pad_byte,
4903 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4904 bfd_put_32 (output_bfd,
4905 (htab->elf.sgotplt->output_section->vma
4906 + htab->elf.sgotplt->output_offset
4907 + 4),
4908 htab->elf.splt->contents
4909 + abed->plt->plt0_got1_offset);
4910 bfd_put_32 (output_bfd,
4911 (htab->elf.sgotplt->output_section->vma
4912 + htab->elf.sgotplt->output_offset
4913 + 8),
4914 htab->elf.splt->contents
4915 + abed->plt->plt0_got2_offset);
4916
4917 if (abed->is_vxworks)
4918 {
4919 Elf_Internal_Rela rel;
4920
4921 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4922 On IA32 we use REL relocations so the addend goes in
4923 the PLT directly. */
4924 rel.r_offset = (htab->elf.splt->output_section->vma
4925 + htab->elf.splt->output_offset
4926 + abed->plt->plt0_got1_offset);
4927 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4928 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4929 htab->srelplt2->contents);
4930 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4931 rel.r_offset = (htab->elf.splt->output_section->vma
4932 + htab->elf.splt->output_offset
4933 + abed->plt->plt0_got2_offset);
4934 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4935 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4936 htab->srelplt2->contents +
4937 sizeof (Elf32_External_Rel));
4938 }
4939 }
4940
4941 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4942 really seem like the right value. */
4943 elf_section_data (htab->elf.splt->output_section)
4944 ->this_hdr.sh_entsize = 4;
4945
4946 /* Correct the .rel.plt.unloaded relocations. */
4947 if (abed->is_vxworks && !info->shared)
4948 {
4949 int num_plts = (htab->elf.splt->size
4950 / abed->plt->plt_entry_size) - 1;
4951 unsigned char *p;
4952
4953 p = htab->srelplt2->contents;
4954 if (info->shared)
4955 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4956 else
4957 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4958
4959 for (; num_plts; num_plts--)
4960 {
4961 Elf_Internal_Rela rel;
4962 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4963 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4964 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4965 p += sizeof (Elf32_External_Rel);
4966
4967 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4968 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4969 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4970 p += sizeof (Elf32_External_Rel);
4971 }
4972 }
4973 }
4974 }
4975
4976 if (htab->elf.sgotplt)
4977 {
4978 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4979 {
4980 (*_bfd_error_handler)
4981 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4982 return FALSE;
4983 }
4984
4985 /* Fill in the first three entries in the global offset table. */
4986 if (htab->elf.sgotplt->size > 0)
4987 {
4988 bfd_put_32 (output_bfd,
4989 (sdyn == NULL ? 0
4990 : sdyn->output_section->vma + sdyn->output_offset),
4991 htab->elf.sgotplt->contents);
4992 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4993 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4994 }
4995
4996 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4997 }
4998
4999 /* Adjust .eh_frame for .plt section. */
5000 if (htab->plt_eh_frame != NULL
5001 && htab->plt_eh_frame->contents != NULL)
5002 {
5003 if (htab->elf.splt != NULL
5004 && htab->elf.splt->size != 0
5005 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5006 && htab->elf.splt->output_section != NULL
5007 && htab->plt_eh_frame->output_section != NULL)
5008 {
5009 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5010 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5011 + htab->plt_eh_frame->output_offset
5012 + PLT_FDE_START_OFFSET;
5013 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5014 htab->plt_eh_frame->contents
5015 + PLT_FDE_START_OFFSET);
5016 }
5017 if (htab->plt_eh_frame->sec_info_type
5018 == SEC_INFO_TYPE_EH_FRAME)
5019 {
5020 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5021 htab->plt_eh_frame,
5022 htab->plt_eh_frame->contents))
5023 return FALSE;
5024 }
5025 }
5026
5027 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5028 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5029
5030 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5031 htab_traverse (htab->loc_hash_table,
5032 elf_i386_finish_local_dynamic_symbol,
5033 info);
5034
5035 return TRUE;
5036 }
5037
5038 /* Return address for Ith PLT stub in section PLT, for relocation REL
5039 or (bfd_vma) -1 if it should not be included. */
5040
5041 static bfd_vma
5042 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
5043 const arelent *rel ATTRIBUTE_UNUSED)
5044 {
5045 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5046 }
5047
5048 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5049
5050 static bfd_boolean
5051 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5052 {
5053 if (h->plt.offset != (bfd_vma) -1
5054 && !h->def_regular
5055 && !h->pointer_equality_needed)
5056 return FALSE;
5057
5058 return _bfd_elf_hash_symbol (h);
5059 }
5060
5061 /* Hook called by the linker routine which adds symbols from an object
5062 file. */
5063
5064 static bfd_boolean
5065 elf_i386_add_symbol_hook (bfd * abfd,
5066 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5067 Elf_Internal_Sym * sym,
5068 const char ** namep ATTRIBUTE_UNUSED,
5069 flagword * flagsp ATTRIBUTE_UNUSED,
5070 asection ** secp ATTRIBUTE_UNUSED,
5071 bfd_vma * valp ATTRIBUTE_UNUSED)
5072 {
5073 if ((abfd->flags & DYNAMIC) == 0
5074 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5075 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5076 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5077
5078 return TRUE;
5079 }
5080
5081 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5082 #define TARGET_LITTLE_NAME "elf32-i386"
5083 #define ELF_ARCH bfd_arch_i386
5084 #define ELF_TARGET_ID I386_ELF_DATA
5085 #define ELF_MACHINE_CODE EM_386
5086 #define ELF_MAXPAGESIZE 0x1000
5087
5088 #define elf_backend_can_gc_sections 1
5089 #define elf_backend_can_refcount 1
5090 #define elf_backend_want_got_plt 1
5091 #define elf_backend_plt_readonly 1
5092 #define elf_backend_want_plt_sym 0
5093 #define elf_backend_got_header_size 12
5094 #define elf_backend_plt_alignment 4
5095
5096 /* Support RELA for objdump of prelink objects. */
5097 #define elf_info_to_howto elf_i386_info_to_howto_rel
5098 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5099
5100 #define bfd_elf32_mkobject elf_i386_mkobject
5101
5102 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5103 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5104 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5105 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5106 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5107
5108 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5109 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5110 #define elf_backend_check_relocs elf_i386_check_relocs
5111 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5112 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5113 #define elf_backend_fake_sections elf_i386_fake_sections
5114 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5115 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5116 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5117 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5118 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5119 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5120 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5121 #define elf_backend_relocate_section elf_i386_relocate_section
5122 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5123 #define elf_backend_always_size_sections elf_i386_always_size_sections
5124 #define elf_backend_omit_section_dynsym \
5125 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5126 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5127 #define elf_backend_hash_symbol elf_i386_hash_symbol
5128 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5129 #undef elf_backend_post_process_headers
5130 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5131
5132 #include "elf32-target.h"
5133
5134 /* FreeBSD support. */
5135
5136 #undef TARGET_LITTLE_SYM
5137 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5138 #undef TARGET_LITTLE_NAME
5139 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5140 #undef ELF_OSABI
5141 #define ELF_OSABI ELFOSABI_FREEBSD
5142
5143 /* The kernel recognizes executables as valid only if they carry a
5144 "FreeBSD" label in the ELF header. So we put this label on all
5145 executables and (for simplicity) also all other object files. */
5146
5147 static void
5148 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5149 {
5150 _bfd_elf_set_osabi (abfd, info);
5151
5152 #ifdef OLD_FREEBSD_ABI_LABEL
5153 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5154 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5155 #endif
5156 }
5157
5158 #undef elf_backend_post_process_headers
5159 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5160 #undef elf32_bed
5161 #define elf32_bed elf32_i386_fbsd_bed
5162
5163 #undef elf_backend_add_symbol_hook
5164
5165 #include "elf32-target.h"
5166
5167 /* Solaris 2. */
5168
5169 #undef TARGET_LITTLE_SYM
5170 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5171 #undef TARGET_LITTLE_NAME
5172 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5173
5174 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5175 objects won't be recognized. */
5176 #undef ELF_OSABI
5177
5178 #undef elf32_bed
5179 #define elf32_bed elf32_i386_sol2_bed
5180
5181 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5182 boundary. */
5183 #undef elf_backend_static_tls_alignment
5184 #define elf_backend_static_tls_alignment 8
5185
5186 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5187
5188 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5189 File, p.63. */
5190 #undef elf_backend_want_plt_sym
5191 #define elf_backend_want_plt_sym 1
5192
5193 #include "elf32-target.h"
5194
5195 /* Native Client support. */
5196
5197 #undef TARGET_LITTLE_SYM
5198 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5199 #undef TARGET_LITTLE_NAME
5200 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5201 #undef elf32_bed
5202 #define elf32_bed elf32_i386_nacl_bed
5203
5204 #undef ELF_MAXPAGESIZE
5205 #define ELF_MAXPAGESIZE 0x10000
5206
5207 /* Restore defaults. */
5208 #undef ELF_OSABI
5209 #undef elf_backend_want_plt_sym
5210 #define elf_backend_want_plt_sym 0
5211 #undef elf_backend_post_process_headers
5212 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5213 #undef elf_backend_static_tls_alignment
5214
5215 /* NaCl uses substantially different PLT entries for the same effects. */
5216
5217 #undef elf_backend_plt_alignment
5218 #define elf_backend_plt_alignment 5
5219 #define NACL_PLT_ENTRY_SIZE 64
5220 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5221
5222 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5223 {
5224 0xff, 0x35, /* pushl contents of address */
5225 0, 0, 0, 0, /* replaced with address of .got + 4. */
5226 0x8b, 0x0d, /* movl contents of address, %ecx */
5227 0, 0, 0, 0, /* replaced with address of .got + 8. */
5228 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5229 0xff, 0xe1 /* jmp *%ecx */
5230 };
5231
5232 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5233 {
5234 0x8b, 0x0d, /* movl contents of address, %ecx */
5235 0, 0, 0, 0, /* replaced with GOT slot address. */
5236 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5237 0xff, 0xe1, /* jmp *%ecx */
5238
5239 /* Pad to the next 32-byte boundary with nop instructions. */
5240 0x90,
5241 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5242 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5243
5244 /* Lazy GOT entries point here (32-byte aligned). */
5245 0x68, /* pushl immediate */
5246 0, 0, 0, 0, /* replaced with reloc offset. */
5247 0xe9, /* jmp relative */
5248 0, 0, 0, 0, /* replaced with offset to .plt. */
5249
5250 /* Pad to the next 32-byte boundary with nop instructions. */
5251 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5252 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5253 0x90, 0x90
5254 };
5255
5256 static const bfd_byte
5257 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5258 {
5259 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5260 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5261 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5262 0xff, 0xe1, /* jmp *%ecx */
5263
5264 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5265 so pad to that size with nop instructions. */
5266 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5267 };
5268
5269 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5270 {
5271 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5272 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5273 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5274 0xff, 0xe1, /* jmp *%ecx */
5275
5276 /* Pad to the next 32-byte boundary with nop instructions. */
5277 0x90,
5278 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5279 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5280
5281 /* Lazy GOT entries point here (32-byte aligned). */
5282 0x68, /* pushl immediate */
5283 0, 0, 0, 0, /* replaced with offset into relocation table. */
5284 0xe9, /* jmp relative */
5285 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5286
5287 /* Pad to the next 32-byte boundary with nop instructions. */
5288 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5289 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5290 0x90, 0x90
5291 };
5292
5293 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5294 {
5295 #if (PLT_CIE_LENGTH != 20 \
5296 || PLT_FDE_LENGTH != 36 \
5297 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5298 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5299 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5300 #endif
5301 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5302 0, 0, 0, 0, /* CIE ID */
5303 1, /* CIE version */
5304 'z', 'R', 0, /* Augmentation string */
5305 1, /* Code alignment factor */
5306 0x7c, /* Data alignment factor: -4 */
5307 8, /* Return address column */
5308 1, /* Augmentation size */
5309 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5310 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5311 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5312 DW_CFA_nop, DW_CFA_nop,
5313
5314 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5315 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5316 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5317 0, 0, 0, 0, /* .plt size goes here */
5318 0, /* Augmentation size */
5319 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5320 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5321 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5322 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5323 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5324 13, /* Block length */
5325 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5326 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5327 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5328 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5329 DW_CFA_nop, DW_CFA_nop
5330 };
5331
5332 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5333 {
5334 elf_i386_nacl_plt0_entry, /* plt0_entry */
5335 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5336 2, /* plt0_got1_offset */
5337 8, /* plt0_got2_offset */
5338 elf_i386_nacl_plt_entry, /* plt_entry */
5339 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5340 2, /* plt_got_offset */
5341 33, /* plt_reloc_offset */
5342 38, /* plt_plt_offset */
5343 32, /* plt_lazy_offset */
5344 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5345 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5346 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5347 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5348 };
5349
5350 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5351 {
5352 &elf_i386_nacl_plt, /* plt */
5353 0x90, /* plt0_pad_byte: nop insn */
5354 0, /* is_vxworks */
5355 };
5356
5357 #undef elf_backend_arch_data
5358 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5359
5360 #undef elf_backend_modify_segment_map
5361 #define elf_backend_modify_segment_map nacl_modify_segment_map
5362 #undef elf_backend_modify_program_headers
5363 #define elf_backend_modify_program_headers nacl_modify_program_headers
5364
5365 #include "elf32-target.h"
5366
5367 /* Restore defaults. */
5368 #undef elf_backend_modify_segment_map
5369 #undef elf_backend_modify_program_headers
5370
5371 /* VxWorks support. */
5372
5373 #undef TARGET_LITTLE_SYM
5374 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5375 #undef TARGET_LITTLE_NAME
5376 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5377 #undef ELF_OSABI
5378 #undef elf_backend_plt_alignment
5379 #define elf_backend_plt_alignment 4
5380
5381 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5382 {
5383 &elf_i386_plt, /* plt */
5384 0x90, /* plt0_pad_byte */
5385 1, /* is_vxworks */
5386 };
5387
5388 #undef elf_backend_arch_data
5389 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5390
5391 #undef elf_backend_relocs_compatible
5392 #undef elf_backend_post_process_headers
5393 #undef elf_backend_add_symbol_hook
5394 #define elf_backend_add_symbol_hook \
5395 elf_vxworks_add_symbol_hook
5396 #undef elf_backend_link_output_symbol_hook
5397 #define elf_backend_link_output_symbol_hook \
5398 elf_vxworks_link_output_symbol_hook
5399 #undef elf_backend_emit_relocs
5400 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5401 #undef elf_backend_final_write_processing
5402 #define elf_backend_final_write_processing \
5403 elf_vxworks_final_write_processing
5404 #undef elf_backend_static_tls_alignment
5405
5406 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5407 define it. */
5408 #undef elf_backend_want_plt_sym
5409 #define elf_backend_want_plt_sym 1
5410
5411 #undef elf32_bed
5412 #define elf32_bed elf32_i386_vxworks_bed
5413
5414 #include "elf32-target.h"
GDB Binutils - Deliverables
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