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Convert mov to lea in size_dynamic_sections
[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 or no relocations. */
2563 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2564 || sec->reloc_count == 0)
2565 return TRUE;
2566
2567 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2568
2569 /* Load the relocations for this section. */
2570 internal_relocs = (_bfd_elf_link_read_relocs
2571 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2572 link_info->keep_memory));
2573 if (internal_relocs == NULL)
2574 return FALSE;
2575
2576 htab = elf_i386_hash_table (link_info);
2577 changed_contents = FALSE;
2578 changed_relocs = FALSE;
2579 local_got_refcounts = elf_local_got_refcounts (abfd);
2580
2581 /* Get the section contents. */
2582 if (elf_section_data (sec)->this_hdr.contents != NULL)
2583 contents = elf_section_data (sec)->this_hdr.contents;
2584 else
2585 {
2586 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2587 goto error_return;
2588 }
2589
2590 irelend = internal_relocs + sec->reloc_count;
2591 for (irel = internal_relocs; irel < irelend; irel++)
2592 {
2593 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2594 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2595 unsigned int indx;
2596 struct elf_link_hash_entry *h;
2597
2598 if (r_type != R_386_GOT32)
2599 continue;
2600
2601 /* Get the symbol referred to by the reloc. */
2602 if (r_symndx < symtab_hdr->sh_info)
2603 {
2604 Elf_Internal_Sym *isym;
2605
2606 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2607 abfd, r_symndx);
2608
2609 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2610 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2611 && bfd_get_8 (input_bfd,
2612 contents + irel->r_offset - 2) == 0x8b)
2613 {
2614 bfd_put_8 (output_bfd, 0x8d,
2615 contents + irel->r_offset - 2);
2616 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2617 if (local_got_refcounts != NULL
2618 && local_got_refcounts[r_symndx] > 0)
2619 local_got_refcounts[r_symndx] -= 1;
2620 changed_contents = TRUE;
2621 changed_relocs = TRUE;
2622 }
2623 continue;
2624 }
2625
2626 indx = r_symndx - symtab_hdr->sh_info;
2627 h = elf_sym_hashes (abfd)[indx];
2628 BFD_ASSERT (h != NULL);
2629
2630 while (h->root.type == bfd_link_hash_indirect
2631 || h->root.type == bfd_link_hash_warning)
2632 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2633
2634 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2635 if (h->def_regular
2636 && h->type != STT_GNU_IFUNC
2637 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2638 && bfd_get_8 (input_bfd,
2639 contents + irel->r_offset - 2) == 0x8b)
2640 {
2641 bfd_put_8 (output_bfd, 0x8d,
2642 contents + irel->r_offset - 2);
2643 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2644 if (h->got.refcount > 0)
2645 h->got.refcount -= 1;
2646 changed_contents = TRUE;
2647 changed_relocs = TRUE;
2648 }
2649 }
2650
2651 if (contents != NULL
2652 && elf_section_data (sec)->this_hdr.contents != contents)
2653 {
2654 if (!changed_contents && !link_info->keep_memory)
2655 free (contents);
2656 else
2657 {
2658 /* Cache the section contents for elf_link_input_bfd. */
2659 elf_section_data (sec)->this_hdr.contents = contents;
2660 }
2661 }
2662
2663 if (elf_section_data (sec)->relocs != internal_relocs)
2664 {
2665 if (!changed_relocs)
2666 free (internal_relocs);
2667 else
2668 elf_section_data (sec)->relocs = internal_relocs;
2669 }
2670
2671 return TRUE;
2672
2673 error_return:
2674 if (contents != NULL
2675 && elf_section_data (sec)->this_hdr.contents != contents)
2676 free (contents);
2677 if (internal_relocs != NULL
2678 && elf_section_data (sec)->relocs != internal_relocs)
2679 free (internal_relocs);
2680 return FALSE;
2681 }
2682
2683 /* Set the sizes of the dynamic sections. */
2684
2685 static bfd_boolean
2686 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2687 {
2688 struct elf_i386_link_hash_table *htab;
2689 bfd *dynobj;
2690 asection *s;
2691 bfd_boolean relocs;
2692 bfd *ibfd;
2693
2694 htab = elf_i386_hash_table (info);
2695 if (htab == NULL)
2696 return FALSE;
2697 dynobj = htab->elf.dynobj;
2698 if (dynobj == NULL)
2699 abort ();
2700
2701 if (htab->elf.dynamic_sections_created)
2702 {
2703 /* Set the contents of the .interp section to the interpreter. */
2704 if (info->executable)
2705 {
2706 s = bfd_get_linker_section (dynobj, ".interp");
2707 if (s == NULL)
2708 abort ();
2709 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2710 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2711 }
2712 }
2713
2714 /* Set up .got offsets for local syms, and space for local dynamic
2715 relocs. */
2716 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2717 {
2718 bfd_signed_vma *local_got;
2719 bfd_signed_vma *end_local_got;
2720 char *local_tls_type;
2721 bfd_vma *local_tlsdesc_gotent;
2722 bfd_size_type locsymcount;
2723 Elf_Internal_Shdr *symtab_hdr;
2724 asection *srel;
2725
2726 if (! is_i386_elf (ibfd))
2727 continue;
2728
2729 for (s = ibfd->sections; s != NULL; s = s->next)
2730 {
2731 struct elf_dyn_relocs *p;
2732
2733 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2734 return FALSE;
2735
2736 for (p = ((struct elf_dyn_relocs *)
2737 elf_section_data (s)->local_dynrel);
2738 p != NULL;
2739 p = p->next)
2740 {
2741 if (!bfd_is_abs_section (p->sec)
2742 && bfd_is_abs_section (p->sec->output_section))
2743 {
2744 /* Input section has been discarded, either because
2745 it is a copy of a linkonce section or due to
2746 linker script /DISCARD/, so we'll be discarding
2747 the relocs too. */
2748 }
2749 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2750 && strcmp (p->sec->output_section->name,
2751 ".tls_vars") == 0)
2752 {
2753 /* Relocations in vxworks .tls_vars sections are
2754 handled specially by the loader. */
2755 }
2756 else if (p->count != 0)
2757 {
2758 srel = elf_section_data (p->sec)->sreloc;
2759 srel->size += p->count * sizeof (Elf32_External_Rel);
2760 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2761 && (info->flags & DF_TEXTREL) == 0)
2762 {
2763 info->flags |= DF_TEXTREL;
2764 if (info->warn_shared_textrel && info->shared)
2765 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2766 p->sec->owner, p->sec);
2767 }
2768 }
2769 }
2770 }
2771
2772 local_got = elf_local_got_refcounts (ibfd);
2773 if (!local_got)
2774 continue;
2775
2776 symtab_hdr = &elf_symtab_hdr (ibfd);
2777 locsymcount = symtab_hdr->sh_info;
2778 end_local_got = local_got + locsymcount;
2779 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2780 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2781 s = htab->elf.sgot;
2782 srel = htab->elf.srelgot;
2783 for (; local_got < end_local_got;
2784 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2785 {
2786 *local_tlsdesc_gotent = (bfd_vma) -1;
2787 if (*local_got > 0)
2788 {
2789 if (GOT_TLS_GDESC_P (*local_tls_type))
2790 {
2791 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2792 - elf_i386_compute_jump_table_size (htab);
2793 htab->elf.sgotplt->size += 8;
2794 *local_got = (bfd_vma) -2;
2795 }
2796 if (! GOT_TLS_GDESC_P (*local_tls_type)
2797 || GOT_TLS_GD_P (*local_tls_type))
2798 {
2799 *local_got = s->size;
2800 s->size += 4;
2801 if (GOT_TLS_GD_P (*local_tls_type)
2802 || *local_tls_type == GOT_TLS_IE_BOTH)
2803 s->size += 4;
2804 }
2805 if (info->shared
2806 || GOT_TLS_GD_ANY_P (*local_tls_type)
2807 || (*local_tls_type & GOT_TLS_IE))
2808 {
2809 if (*local_tls_type == GOT_TLS_IE_BOTH)
2810 srel->size += 2 * sizeof (Elf32_External_Rel);
2811 else if (GOT_TLS_GD_P (*local_tls_type)
2812 || ! GOT_TLS_GDESC_P (*local_tls_type))
2813 srel->size += sizeof (Elf32_External_Rel);
2814 if (GOT_TLS_GDESC_P (*local_tls_type))
2815 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2816 }
2817 }
2818 else
2819 *local_got = (bfd_vma) -1;
2820 }
2821 }
2822
2823 if (htab->tls_ldm_got.refcount > 0)
2824 {
2825 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2826 relocs. */
2827 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2828 htab->elf.sgot->size += 8;
2829 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2830 }
2831 else
2832 htab->tls_ldm_got.offset = -1;
2833
2834 /* Allocate global sym .plt and .got entries, and space for global
2835 sym dynamic relocs. */
2836 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2837
2838 /* Allocate .plt and .got entries, and space for local symbols. */
2839 htab_traverse (htab->loc_hash_table,
2840 elf_i386_allocate_local_dynrelocs,
2841 info);
2842
2843 /* For every jump slot reserved in the sgotplt, reloc_count is
2844 incremented. However, when we reserve space for TLS descriptors,
2845 it's not incremented, so in order to compute the space reserved
2846 for them, it suffices to multiply the reloc count by the jump
2847 slot size.
2848
2849 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2850 so that R_386_IRELATIVE entries come last. */
2851 if (htab->elf.srelplt)
2852 {
2853 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2854 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2855 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2856 }
2857 else if (htab->elf.irelplt)
2858 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2859
2860
2861 if (htab->elf.sgotplt)
2862 {
2863 struct elf_link_hash_entry *got;
2864 got = elf_link_hash_lookup (elf_hash_table (info),
2865 "_GLOBAL_OFFSET_TABLE_",
2866 FALSE, FALSE, FALSE);
2867
2868 /* Don't allocate .got.plt section if there are no GOT nor PLT
2869 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2870 if ((got == NULL
2871 || !got->ref_regular_nonweak)
2872 && (htab->elf.sgotplt->size
2873 == get_elf_backend_data (output_bfd)->got_header_size)
2874 && (htab->elf.splt == NULL
2875 || htab->elf.splt->size == 0)
2876 && (htab->elf.sgot == NULL
2877 || htab->elf.sgot->size == 0)
2878 && (htab->elf.iplt == NULL
2879 || htab->elf.iplt->size == 0)
2880 && (htab->elf.igotplt == NULL
2881 || htab->elf.igotplt->size == 0))
2882 htab->elf.sgotplt->size = 0;
2883 }
2884
2885
2886 if (htab->plt_eh_frame != NULL
2887 && htab->elf.splt != NULL
2888 && htab->elf.splt->size != 0
2889 && !bfd_is_abs_section (htab->elf.splt->output_section)
2890 && _bfd_elf_eh_frame_present (info))
2891 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2892
2893 /* We now have determined the sizes of the various dynamic sections.
2894 Allocate memory for them. */
2895 relocs = FALSE;
2896 for (s = dynobj->sections; s != NULL; s = s->next)
2897 {
2898 bfd_boolean strip_section = TRUE;
2899
2900 if ((s->flags & SEC_LINKER_CREATED) == 0)
2901 continue;
2902
2903 if (s == htab->elf.splt
2904 || s == htab->elf.sgot)
2905 {
2906 /* Strip this section if we don't need it; see the
2907 comment below. */
2908 /* We'd like to strip these sections if they aren't needed, but if
2909 we've exported dynamic symbols from them we must leave them.
2910 It's too late to tell BFD to get rid of the symbols. */
2911
2912 if (htab->elf.hplt != NULL)
2913 strip_section = FALSE;
2914 }
2915 else if (s == htab->elf.sgotplt
2916 || s == htab->elf.iplt
2917 || s == htab->elf.igotplt
2918 || s == htab->plt_eh_frame
2919 || s == htab->sdynbss)
2920 {
2921 /* Strip these too. */
2922 }
2923 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2924 {
2925 if (s->size != 0
2926 && s != htab->elf.srelplt
2927 && s != htab->srelplt2)
2928 relocs = TRUE;
2929
2930 /* We use the reloc_count field as a counter if we need
2931 to copy relocs into the output file. */
2932 s->reloc_count = 0;
2933 }
2934 else
2935 {
2936 /* It's not one of our sections, so don't allocate space. */
2937 continue;
2938 }
2939
2940 if (s->size == 0)
2941 {
2942 /* If we don't need this section, strip it from the
2943 output file. This is mostly to handle .rel.bss and
2944 .rel.plt. We must create both sections in
2945 create_dynamic_sections, because they must be created
2946 before the linker maps input sections to output
2947 sections. The linker does that before
2948 adjust_dynamic_symbol is called, and it is that
2949 function which decides whether anything needs to go
2950 into these sections. */
2951 if (strip_section)
2952 s->flags |= SEC_EXCLUDE;
2953 continue;
2954 }
2955
2956 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2957 continue;
2958
2959 /* Allocate memory for the section contents. We use bfd_zalloc
2960 here in case unused entries are not reclaimed before the
2961 section's contents are written out. This should not happen,
2962 but this way if it does, we get a R_386_NONE reloc instead
2963 of garbage. */
2964 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2965 if (s->contents == NULL)
2966 return FALSE;
2967 }
2968
2969 if (htab->plt_eh_frame != NULL
2970 && htab->plt_eh_frame->contents != NULL)
2971 {
2972 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2973 sizeof (elf_i386_eh_frame_plt));
2974 bfd_put_32 (dynobj, htab->elf.splt->size,
2975 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2976 }
2977
2978 if (htab->elf.dynamic_sections_created)
2979 {
2980 /* Add some entries to the .dynamic section. We fill in the
2981 values later, in elf_i386_finish_dynamic_sections, but we
2982 must add the entries now so that we get the correct size for
2983 the .dynamic section. The DT_DEBUG entry is filled in by the
2984 dynamic linker and used by the debugger. */
2985 #define add_dynamic_entry(TAG, VAL) \
2986 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2987
2988 if (info->executable)
2989 {
2990 if (!add_dynamic_entry (DT_DEBUG, 0))
2991 return FALSE;
2992 }
2993
2994 if (htab->elf.splt->size != 0)
2995 {
2996 if (!add_dynamic_entry (DT_PLTGOT, 0)
2997 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2998 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2999 || !add_dynamic_entry (DT_JMPREL, 0))
3000 return FALSE;
3001 }
3002
3003 if (relocs)
3004 {
3005 if (!add_dynamic_entry (DT_REL, 0)
3006 || !add_dynamic_entry (DT_RELSZ, 0)
3007 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3008 return FALSE;
3009
3010 /* If any dynamic relocs apply to a read-only section,
3011 then we need a DT_TEXTREL entry. */
3012 if ((info->flags & DF_TEXTREL) == 0)
3013 elf_link_hash_traverse (&htab->elf,
3014 elf_i386_readonly_dynrelocs, info);
3015
3016 if ((info->flags & DF_TEXTREL) != 0)
3017 {
3018 if (!add_dynamic_entry (DT_TEXTREL, 0))
3019 return FALSE;
3020 }
3021 }
3022 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3023 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3024 return FALSE;
3025 }
3026 #undef add_dynamic_entry
3027
3028 return TRUE;
3029 }
3030
3031 static bfd_boolean
3032 elf_i386_always_size_sections (bfd *output_bfd,
3033 struct bfd_link_info *info)
3034 {
3035 asection *tls_sec = elf_hash_table (info)->tls_sec;
3036
3037 if (tls_sec)
3038 {
3039 struct elf_link_hash_entry *tlsbase;
3040
3041 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3042 "_TLS_MODULE_BASE_",
3043 FALSE, FALSE, FALSE);
3044
3045 if (tlsbase && tlsbase->type == STT_TLS)
3046 {
3047 struct elf_i386_link_hash_table *htab;
3048 struct bfd_link_hash_entry *bh = NULL;
3049 const struct elf_backend_data *bed
3050 = get_elf_backend_data (output_bfd);
3051
3052 htab = elf_i386_hash_table (info);
3053 if (htab == NULL)
3054 return FALSE;
3055
3056 if (!(_bfd_generic_link_add_one_symbol
3057 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3058 tls_sec, 0, NULL, FALSE,
3059 bed->collect, &bh)))
3060 return FALSE;
3061
3062 htab->tls_module_base = bh;
3063
3064 tlsbase = (struct elf_link_hash_entry *)bh;
3065 tlsbase->def_regular = 1;
3066 tlsbase->other = STV_HIDDEN;
3067 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3068 }
3069 }
3070
3071 return TRUE;
3072 }
3073
3074 /* Set the correct type for an x86 ELF section. We do this by the
3075 section name, which is a hack, but ought to work. */
3076
3077 static bfd_boolean
3078 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3079 Elf_Internal_Shdr *hdr,
3080 asection *sec)
3081 {
3082 const char *name;
3083
3084 name = bfd_get_section_name (abfd, sec);
3085
3086 /* This is an ugly, but unfortunately necessary hack that is
3087 needed when producing EFI binaries on x86. It tells
3088 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3089 containing ELF relocation info. We need this hack in order to
3090 be able to generate ELF binaries that can be translated into
3091 EFI applications (which are essentially COFF objects). Those
3092 files contain a COFF ".reloc" section inside an ELFNN object,
3093 which would normally cause BFD to segfault because it would
3094 attempt to interpret this section as containing relocation
3095 entries for section "oc". With this hack enabled, ".reloc"
3096 will be treated as a normal data section, which will avoid the
3097 segfault. However, you won't be able to create an ELFNN binary
3098 with a section named "oc" that needs relocations, but that's
3099 the kind of ugly side-effects you get when detecting section
3100 types based on their names... In practice, this limitation is
3101 unlikely to bite. */
3102 if (strcmp (name, ".reloc") == 0)
3103 hdr->sh_type = SHT_PROGBITS;
3104
3105 return TRUE;
3106 }
3107
3108 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3109 executables. Rather than setting it to the beginning of the TLS
3110 section, we have to set it to the end. This function may be called
3111 multiple times, it is idempotent. */
3112
3113 static void
3114 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3115 {
3116 struct elf_i386_link_hash_table *htab;
3117 struct bfd_link_hash_entry *base;
3118
3119 if (!info->executable)
3120 return;
3121
3122 htab = elf_i386_hash_table (info);
3123 if (htab == NULL)
3124 return;
3125
3126 base = htab->tls_module_base;
3127 if (base == NULL)
3128 return;
3129
3130 base->u.def.value = htab->elf.tls_size;
3131 }
3132
3133 /* Return the base VMA address which should be subtracted from real addresses
3134 when resolving @dtpoff relocation.
3135 This is PT_TLS segment p_vaddr. */
3136
3137 static bfd_vma
3138 elf_i386_dtpoff_base (struct bfd_link_info *info)
3139 {
3140 /* If tls_sec is NULL, we should have signalled an error already. */
3141 if (elf_hash_table (info)->tls_sec == NULL)
3142 return 0;
3143 return elf_hash_table (info)->tls_sec->vma;
3144 }
3145
3146 /* Return the relocation value for @tpoff relocation
3147 if STT_TLS virtual address is ADDRESS. */
3148
3149 static bfd_vma
3150 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3151 {
3152 struct elf_link_hash_table *htab = elf_hash_table (info);
3153 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3154 bfd_vma static_tls_size;
3155
3156 /* If tls_sec is NULL, we should have signalled an error already. */
3157 if (htab->tls_sec == NULL)
3158 return 0;
3159
3160 /* Consider special static TLS alignment requirements. */
3161 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3162 return static_tls_size + htab->tls_sec->vma - address;
3163 }
3164
3165 /* Relocate an i386 ELF section. */
3166
3167 static bfd_boolean
3168 elf_i386_relocate_section (bfd *output_bfd,
3169 struct bfd_link_info *info,
3170 bfd *input_bfd,
3171 asection *input_section,
3172 bfd_byte *contents,
3173 Elf_Internal_Rela *relocs,
3174 Elf_Internal_Sym *local_syms,
3175 asection **local_sections)
3176 {
3177 struct elf_i386_link_hash_table *htab;
3178 Elf_Internal_Shdr *symtab_hdr;
3179 struct elf_link_hash_entry **sym_hashes;
3180 bfd_vma *local_got_offsets;
3181 bfd_vma *local_tlsdesc_gotents;
3182 Elf_Internal_Rela *rel;
3183 Elf_Internal_Rela *relend;
3184 bfd_boolean is_vxworks_tls;
3185 unsigned plt_entry_size;
3186
3187 BFD_ASSERT (is_i386_elf (input_bfd));
3188
3189 htab = elf_i386_hash_table (info);
3190 if (htab == NULL)
3191 return FALSE;
3192 symtab_hdr = &elf_symtab_hdr (input_bfd);
3193 sym_hashes = elf_sym_hashes (input_bfd);
3194 local_got_offsets = elf_local_got_offsets (input_bfd);
3195 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3196 /* We have to handle relocations in vxworks .tls_vars sections
3197 specially, because the dynamic loader is 'weird'. */
3198 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3199 && info->shared
3200 && !strcmp (input_section->output_section->name,
3201 ".tls_vars"));
3202
3203 elf_i386_set_tls_module_base (info);
3204
3205 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3206
3207 rel = relocs;
3208 relend = relocs + input_section->reloc_count;
3209 for (; rel < relend; rel++)
3210 {
3211 unsigned int r_type;
3212 reloc_howto_type *howto;
3213 unsigned long r_symndx;
3214 struct elf_link_hash_entry *h;
3215 Elf_Internal_Sym *sym;
3216 asection *sec;
3217 bfd_vma off, offplt;
3218 bfd_vma relocation;
3219 bfd_boolean unresolved_reloc;
3220 bfd_reloc_status_type r;
3221 unsigned int indx;
3222 int tls_type;
3223
3224 r_type = ELF32_R_TYPE (rel->r_info);
3225 if (r_type == R_386_GNU_VTINHERIT
3226 || r_type == R_386_GNU_VTENTRY)
3227 continue;
3228
3229 if ((indx = r_type) >= R_386_standard
3230 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3231 >= R_386_ext - R_386_standard)
3232 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3233 >= R_386_irelative - R_386_ext))
3234 {
3235 (*_bfd_error_handler)
3236 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3237 input_bfd, input_section, r_type);
3238 bfd_set_error (bfd_error_bad_value);
3239 return FALSE;
3240 }
3241 howto = elf_howto_table + indx;
3242
3243 r_symndx = ELF32_R_SYM (rel->r_info);
3244 h = NULL;
3245 sym = NULL;
3246 sec = NULL;
3247 unresolved_reloc = FALSE;
3248 if (r_symndx < symtab_hdr->sh_info)
3249 {
3250 sym = local_syms + r_symndx;
3251 sec = local_sections[r_symndx];
3252 relocation = (sec->output_section->vma
3253 + sec->output_offset
3254 + sym->st_value);
3255
3256 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3257 && ((sec->flags & SEC_MERGE) != 0
3258 || (info->relocatable
3259 && sec->output_offset != 0)))
3260 {
3261 bfd_vma addend;
3262 bfd_byte *where = contents + rel->r_offset;
3263
3264 switch (howto->size)
3265 {
3266 case 0:
3267 addend = bfd_get_8 (input_bfd, where);
3268 if (howto->pc_relative)
3269 {
3270 addend = (addend ^ 0x80) - 0x80;
3271 addend += 1;
3272 }
3273 break;
3274 case 1:
3275 addend = bfd_get_16 (input_bfd, where);
3276 if (howto->pc_relative)
3277 {
3278 addend = (addend ^ 0x8000) - 0x8000;
3279 addend += 2;
3280 }
3281 break;
3282 case 2:
3283 addend = bfd_get_32 (input_bfd, where);
3284 if (howto->pc_relative)
3285 {
3286 addend = (addend ^ 0x80000000) - 0x80000000;
3287 addend += 4;
3288 }
3289 break;
3290 default:
3291 abort ();
3292 }
3293
3294 if (info->relocatable)
3295 addend += sec->output_offset;
3296 else
3297 {
3298 asection *msec = sec;
3299 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3300 addend);
3301 addend -= relocation;
3302 addend += msec->output_section->vma + msec->output_offset;
3303 }
3304
3305 switch (howto->size)
3306 {
3307 case 0:
3308 /* FIXME: overflow checks. */
3309 if (howto->pc_relative)
3310 addend -= 1;
3311 bfd_put_8 (input_bfd, addend, where);
3312 break;
3313 case 1:
3314 if (howto->pc_relative)
3315 addend -= 2;
3316 bfd_put_16 (input_bfd, addend, where);
3317 break;
3318 case 2:
3319 if (howto->pc_relative)
3320 addend -= 4;
3321 bfd_put_32 (input_bfd, addend, where);
3322 break;
3323 }
3324 }
3325 else if (!info->relocatable
3326 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3327 {
3328 /* Relocate against local STT_GNU_IFUNC symbol. */
3329 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3330 FALSE);
3331 if (h == NULL)
3332 abort ();
3333
3334 /* Set STT_GNU_IFUNC symbol value. */
3335 h->root.u.def.value = sym->st_value;
3336 h->root.u.def.section = sec;
3337 }
3338 }
3339 else
3340 {
3341 bfd_boolean warned ATTRIBUTE_UNUSED;
3342
3343 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3344 r_symndx, symtab_hdr, sym_hashes,
3345 h, sec, relocation,
3346 unresolved_reloc, warned);
3347 }
3348
3349 if (sec != NULL && discarded_section (sec))
3350 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3351 rel, 1, relend, howto, 0, contents);
3352
3353 if (info->relocatable)
3354 continue;
3355
3356 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3357 it here if it is defined in a non-shared object. */
3358 if (h != NULL
3359 && h->type == STT_GNU_IFUNC
3360 && h->def_regular)
3361 {
3362 asection *plt, *gotplt, *base_got;
3363 bfd_vma plt_index;
3364 const char *name;
3365
3366 if ((input_section->flags & SEC_ALLOC) == 0
3367 || h->plt.offset == (bfd_vma) -1)
3368 abort ();
3369
3370 /* STT_GNU_IFUNC symbol must go through PLT. */
3371 if (htab->elf.splt != NULL)
3372 {
3373 plt = htab->elf.splt;
3374 gotplt = htab->elf.sgotplt;
3375 }
3376 else
3377 {
3378 plt = htab->elf.iplt;
3379 gotplt = htab->elf.igotplt;
3380 }
3381
3382 relocation = (plt->output_section->vma
3383 + plt->output_offset + h->plt.offset);
3384
3385 switch (r_type)
3386 {
3387 default:
3388 if (h->root.root.string)
3389 name = h->root.root.string;
3390 else
3391 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3392 NULL);
3393 (*_bfd_error_handler)
3394 (_("%B: relocation %s against STT_GNU_IFUNC "
3395 "symbol `%s' isn't handled by %s"), input_bfd,
3396 elf_howto_table[r_type].name,
3397 name, __FUNCTION__);
3398 bfd_set_error (bfd_error_bad_value);
3399 return FALSE;
3400
3401 case R_386_32:
3402 /* Generate dynamic relcoation only when there is a
3403 non-GOT reference in a shared object. */
3404 if (info->shared && h->non_got_ref)
3405 {
3406 Elf_Internal_Rela outrel;
3407 bfd_byte *loc;
3408 asection *sreloc;
3409 bfd_vma offset;
3410
3411 /* Need a dynamic relocation to get the real function
3412 adddress. */
3413 offset = _bfd_elf_section_offset (output_bfd,
3414 info,
3415 input_section,
3416 rel->r_offset);
3417 if (offset == (bfd_vma) -1
3418 || offset == (bfd_vma) -2)
3419 abort ();
3420
3421 outrel.r_offset = (input_section->output_section->vma
3422 + input_section->output_offset
3423 + offset);
3424
3425 if (h->dynindx == -1
3426 || h->forced_local
3427 || info->executable)
3428 {
3429 /* This symbol is resolved locally. */
3430 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3431 bfd_put_32 (output_bfd,
3432 (h->root.u.def.value
3433 + h->root.u.def.section->output_section->vma
3434 + h->root.u.def.section->output_offset),
3435 contents + offset);
3436 }
3437 else
3438 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3439
3440 sreloc = htab->elf.irelifunc;
3441 loc = sreloc->contents;
3442 loc += (sreloc->reloc_count++
3443 * sizeof (Elf32_External_Rel));
3444 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3445
3446 /* If this reloc is against an external symbol, we
3447 do not want to fiddle with the addend. Otherwise,
3448 we need to include the symbol value so that it
3449 becomes an addend for the dynamic reloc. For an
3450 internal symbol, we have updated addend. */
3451 continue;
3452 }
3453 /* FALLTHROUGH */
3454 case R_386_PC32:
3455 case R_386_PLT32:
3456 goto do_relocation;
3457
3458 case R_386_GOT32:
3459 base_got = htab->elf.sgot;
3460 off = h->got.offset;
3461
3462 if (base_got == NULL)
3463 abort ();
3464
3465 if (off == (bfd_vma) -1)
3466 {
3467 /* We can't use h->got.offset here to save state, or
3468 even just remember the offset, as finish_dynamic_symbol
3469 would use that as offset into .got. */
3470
3471 if (htab->elf.splt != NULL)
3472 {
3473 plt_index = h->plt.offset / plt_entry_size - 1;
3474 off = (plt_index + 3) * 4;
3475 base_got = htab->elf.sgotplt;
3476 }
3477 else
3478 {
3479 plt_index = h->plt.offset / plt_entry_size;
3480 off = plt_index * 4;
3481 base_got = htab->elf.igotplt;
3482 }
3483
3484 if (h->dynindx == -1
3485 || h->forced_local
3486 || info->symbolic)
3487 {
3488 /* This references the local defitionion. We must
3489 initialize this entry in the global offset table.
3490 Since the offset must always be a multiple of 8,
3491 we use the least significant bit to record
3492 whether we have initialized it already.
3493
3494 When doing a dynamic link, we create a .rela.got
3495 relocation entry to initialize the value. This
3496 is done in the finish_dynamic_symbol routine. */
3497 if ((off & 1) != 0)
3498 off &= ~1;
3499 else
3500 {
3501 bfd_put_32 (output_bfd, relocation,
3502 base_got->contents + off);
3503 h->got.offset |= 1;
3504 }
3505 }
3506
3507 relocation = off;
3508
3509 /* Adjust for static executables. */
3510 if (htab->elf.splt == NULL)
3511 relocation += gotplt->output_offset;
3512 }
3513 else
3514 {
3515 relocation = (base_got->output_section->vma
3516 + base_got->output_offset + off
3517 - gotplt->output_section->vma
3518 - gotplt->output_offset);
3519 /* Adjust for static executables. */
3520 if (htab->elf.splt == NULL)
3521 relocation += gotplt->output_offset;
3522 }
3523
3524 goto do_relocation;
3525
3526 case R_386_GOTOFF:
3527 relocation -= (gotplt->output_section->vma
3528 + gotplt->output_offset);
3529 goto do_relocation;
3530 }
3531 }
3532
3533 switch (r_type)
3534 {
3535 case R_386_GOT32:
3536 /* Relocation is to the entry for this symbol in the global
3537 offset table. */
3538 if (htab->elf.sgot == NULL)
3539 abort ();
3540
3541 if (h != NULL)
3542 {
3543 bfd_boolean dyn;
3544
3545 off = h->got.offset;
3546 dyn = htab->elf.dynamic_sections_created;
3547 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3548 || (info->shared
3549 && SYMBOL_REFERENCES_LOCAL (info, h))
3550 || (ELF_ST_VISIBILITY (h->other)
3551 && h->root.type == bfd_link_hash_undefweak))
3552 {
3553 /* This is actually a static link, or it is a
3554 -Bsymbolic link and the symbol is defined
3555 locally, or the symbol was forced to be local
3556 because of a version file. We must initialize
3557 this entry in the global offset table. Since the
3558 offset must always be a multiple of 4, we use the
3559 least significant bit to record whether we have
3560 initialized it already.
3561
3562 When doing a dynamic link, we create a .rel.got
3563 relocation entry to initialize the value. This
3564 is done in the finish_dynamic_symbol routine. */
3565 if ((off & 1) != 0)
3566 off &= ~1;
3567 else
3568 {
3569 bfd_put_32 (output_bfd, relocation,
3570 htab->elf.sgot->contents + off);
3571 h->got.offset |= 1;
3572 }
3573 }
3574 else
3575 unresolved_reloc = FALSE;
3576 }
3577 else
3578 {
3579 if (local_got_offsets == NULL)
3580 abort ();
3581
3582 off = local_got_offsets[r_symndx];
3583
3584 /* The offset must always be a multiple of 4. We use
3585 the least significant bit to record whether we have
3586 already generated the necessary reloc. */
3587 if ((off & 1) != 0)
3588 off &= ~1;
3589 else
3590 {
3591 bfd_put_32 (output_bfd, relocation,
3592 htab->elf.sgot->contents + off);
3593
3594 if (info->shared)
3595 {
3596 asection *s;
3597 Elf_Internal_Rela outrel;
3598 bfd_byte *loc;
3599
3600 s = htab->elf.srelgot;
3601 if (s == NULL)
3602 abort ();
3603
3604 outrel.r_offset = (htab->elf.sgot->output_section->vma
3605 + htab->elf.sgot->output_offset
3606 + off);
3607 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3608 loc = s->contents;
3609 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3610 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3611 }
3612
3613 local_got_offsets[r_symndx] |= 1;
3614 }
3615 }
3616
3617 if (off >= (bfd_vma) -2)
3618 abort ();
3619
3620 relocation = htab->elf.sgot->output_section->vma
3621 + htab->elf.sgot->output_offset + off
3622 - htab->elf.sgotplt->output_section->vma
3623 - htab->elf.sgotplt->output_offset;
3624 break;
3625
3626 case R_386_GOTOFF:
3627 /* Relocation is relative to the start of the global offset
3628 table. */
3629
3630 /* Check to make sure it isn't a protected function symbol
3631 for shared library since it may not be local when used
3632 as function address. We also need to make sure that a
3633 symbol is defined locally. */
3634 if (info->shared && h)
3635 {
3636 if (!h->def_regular)
3637 {
3638 const char *v;
3639
3640 switch (ELF_ST_VISIBILITY (h->other))
3641 {
3642 case STV_HIDDEN:
3643 v = _("hidden symbol");
3644 break;
3645 case STV_INTERNAL:
3646 v = _("internal symbol");
3647 break;
3648 case STV_PROTECTED:
3649 v = _("protected symbol");
3650 break;
3651 default:
3652 v = _("symbol");
3653 break;
3654 }
3655
3656 (*_bfd_error_handler)
3657 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3658 input_bfd, v, h->root.root.string);
3659 bfd_set_error (bfd_error_bad_value);
3660 return FALSE;
3661 }
3662 else if (!info->executable
3663 && !SYMBOLIC_BIND (info, h)
3664 && h->type == STT_FUNC
3665 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3666 {
3667 (*_bfd_error_handler)
3668 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3669 input_bfd, h->root.root.string);
3670 bfd_set_error (bfd_error_bad_value);
3671 return FALSE;
3672 }
3673 }
3674
3675 /* Note that sgot is not involved in this
3676 calculation. We always want the start of .got.plt. If we
3677 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3678 permitted by the ABI, we might have to change this
3679 calculation. */
3680 relocation -= htab->elf.sgotplt->output_section->vma
3681 + htab->elf.sgotplt->output_offset;
3682 break;
3683
3684 case R_386_GOTPC:
3685 /* Use global offset table as symbol value. */
3686 relocation = htab->elf.sgotplt->output_section->vma
3687 + htab->elf.sgotplt->output_offset;
3688 unresolved_reloc = FALSE;
3689 break;
3690
3691 case R_386_PLT32:
3692 /* Relocation is to the entry for this symbol in the
3693 procedure linkage table. */
3694
3695 /* Resolve a PLT32 reloc against a local symbol directly,
3696 without using the procedure linkage table. */
3697 if (h == NULL)
3698 break;
3699
3700 if (h->plt.offset == (bfd_vma) -1
3701 || htab->elf.splt == NULL)
3702 {
3703 /* We didn't make a PLT entry for this symbol. This
3704 happens when statically linking PIC code, or when
3705 using -Bsymbolic. */
3706 break;
3707 }
3708
3709 relocation = (htab->elf.splt->output_section->vma
3710 + htab->elf.splt->output_offset
3711 + h->plt.offset);
3712 unresolved_reloc = FALSE;
3713 break;
3714
3715 case R_386_32:
3716 case R_386_PC32:
3717 if ((input_section->flags & SEC_ALLOC) == 0
3718 || is_vxworks_tls)
3719 break;
3720
3721 if ((info->shared
3722 && (h == NULL
3723 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3724 || h->root.type != bfd_link_hash_undefweak)
3725 && (r_type != R_386_PC32
3726 || !SYMBOL_CALLS_LOCAL (info, h)))
3727 || (ELIMINATE_COPY_RELOCS
3728 && !info->shared
3729 && h != NULL
3730 && h->dynindx != -1
3731 && !h->non_got_ref
3732 && ((h->def_dynamic
3733 && !h->def_regular)
3734 || h->root.type == bfd_link_hash_undefweak
3735 || h->root.type == bfd_link_hash_undefined)))
3736 {
3737 Elf_Internal_Rela outrel;
3738 bfd_byte *loc;
3739 bfd_boolean skip, relocate;
3740 asection *sreloc;
3741
3742 /* When generating a shared object, these relocations
3743 are copied into the output file to be resolved at run
3744 time. */
3745
3746 skip = FALSE;
3747 relocate = FALSE;
3748
3749 outrel.r_offset =
3750 _bfd_elf_section_offset (output_bfd, info, input_section,
3751 rel->r_offset);
3752 if (outrel.r_offset == (bfd_vma) -1)
3753 skip = TRUE;
3754 else if (outrel.r_offset == (bfd_vma) -2)
3755 skip = TRUE, relocate = TRUE;
3756 outrel.r_offset += (input_section->output_section->vma
3757 + input_section->output_offset);
3758
3759 if (skip)
3760 memset (&outrel, 0, sizeof outrel);
3761 else if (h != NULL
3762 && h->dynindx != -1
3763 && (r_type == R_386_PC32
3764 || !info->shared
3765 || !SYMBOLIC_BIND (info, h)
3766 || !h->def_regular))
3767 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3768 else
3769 {
3770 /* This symbol is local, or marked to become local. */
3771 relocate = TRUE;
3772 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3773 }
3774
3775 sreloc = elf_section_data (input_section)->sreloc;
3776
3777 if (sreloc == NULL || sreloc->contents == NULL)
3778 {
3779 r = bfd_reloc_notsupported;
3780 goto check_relocation_error;
3781 }
3782
3783 loc = sreloc->contents;
3784 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3785
3786 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3787
3788 /* If this reloc is against an external symbol, we do
3789 not want to fiddle with the addend. Otherwise, we
3790 need to include the symbol value so that it becomes
3791 an addend for the dynamic reloc. */
3792 if (! relocate)
3793 continue;
3794 }
3795 break;
3796
3797 case R_386_TLS_IE:
3798 if (!info->executable)
3799 {
3800 Elf_Internal_Rela outrel;
3801 bfd_byte *loc;
3802 asection *sreloc;
3803
3804 outrel.r_offset = rel->r_offset
3805 + input_section->output_section->vma
3806 + input_section->output_offset;
3807 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3808 sreloc = elf_section_data (input_section)->sreloc;
3809 if (sreloc == NULL)
3810 abort ();
3811 loc = sreloc->contents;
3812 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3813 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3814 }
3815 /* Fall through */
3816
3817 case R_386_TLS_GD:
3818 case R_386_TLS_GOTDESC:
3819 case R_386_TLS_DESC_CALL:
3820 case R_386_TLS_IE_32:
3821 case R_386_TLS_GOTIE:
3822 tls_type = GOT_UNKNOWN;
3823 if (h == NULL && local_got_offsets)
3824 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3825 else if (h != NULL)
3826 tls_type = elf_i386_hash_entry(h)->tls_type;
3827 if (tls_type == GOT_TLS_IE)
3828 tls_type = GOT_TLS_IE_NEG;
3829
3830 if (! elf_i386_tls_transition (info, input_bfd,
3831 input_section, contents,
3832 symtab_hdr, sym_hashes,
3833 &r_type, tls_type, rel,
3834 relend, h, r_symndx))
3835 return FALSE;
3836
3837 if (r_type == R_386_TLS_LE_32)
3838 {
3839 BFD_ASSERT (! unresolved_reloc);
3840 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3841 {
3842 unsigned int type;
3843 bfd_vma roff;
3844
3845 /* GD->LE transition. */
3846 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3847 if (type == 0x04)
3848 {
3849 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3850 Change it into:
3851 movl %gs:0, %eax; subl $foo@tpoff, %eax
3852 (6 byte form of subl). */
3853 memcpy (contents + rel->r_offset - 3,
3854 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3855 roff = rel->r_offset + 5;
3856 }
3857 else
3858 {
3859 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3860 Change it into:
3861 movl %gs:0, %eax; subl $foo@tpoff, %eax
3862 (6 byte form of subl). */
3863 memcpy (contents + rel->r_offset - 2,
3864 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3865 roff = rel->r_offset + 6;
3866 }
3867 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3868 contents + roff);
3869 /* Skip R_386_PC32/R_386_PLT32. */
3870 rel++;
3871 continue;
3872 }
3873 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3874 {
3875 /* GDesc -> LE transition.
3876 It's originally something like:
3877 leal x@tlsdesc(%ebx), %eax
3878
3879 leal x@ntpoff, %eax
3880
3881 Registers other than %eax may be set up here. */
3882
3883 unsigned int val;
3884 bfd_vma roff;
3885
3886 roff = rel->r_offset;
3887 val = bfd_get_8 (input_bfd, contents + roff - 1);
3888
3889 /* Now modify the instruction as appropriate. */
3890 /* aoliva FIXME: remove the above and xor the byte
3891 below with 0x86. */
3892 bfd_put_8 (output_bfd, val ^ 0x86,
3893 contents + roff - 1);
3894 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3895 contents + roff);
3896 continue;
3897 }
3898 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3899 {
3900 /* GDesc -> LE transition.
3901 It's originally:
3902 call *(%eax)
3903 Turn it into:
3904 xchg %ax,%ax */
3905
3906 bfd_vma roff;
3907
3908 roff = rel->r_offset;
3909 bfd_put_8 (output_bfd, 0x66, contents + roff);
3910 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3911 continue;
3912 }
3913 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3914 {
3915 unsigned int val;
3916
3917 /* IE->LE transition:
3918 Originally it can be one of:
3919 movl foo, %eax
3920 movl foo, %reg
3921 addl foo, %reg
3922 We change it into:
3923 movl $foo, %eax
3924 movl $foo, %reg
3925 addl $foo, %reg. */
3926 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3927 if (val == 0xa1)
3928 {
3929 /* movl foo, %eax. */
3930 bfd_put_8 (output_bfd, 0xb8,
3931 contents + rel->r_offset - 1);
3932 }
3933 else
3934 {
3935 unsigned int type;
3936
3937 type = bfd_get_8 (input_bfd,
3938 contents + rel->r_offset - 2);
3939 switch (type)
3940 {
3941 case 0x8b:
3942 /* movl */
3943 bfd_put_8 (output_bfd, 0xc7,
3944 contents + rel->r_offset - 2);
3945 bfd_put_8 (output_bfd,
3946 0xc0 | ((val >> 3) & 7),
3947 contents + rel->r_offset - 1);
3948 break;
3949 case 0x03:
3950 /* addl */
3951 bfd_put_8 (output_bfd, 0x81,
3952 contents + rel->r_offset - 2);
3953 bfd_put_8 (output_bfd,
3954 0xc0 | ((val >> 3) & 7),
3955 contents + rel->r_offset - 1);
3956 break;
3957 default:
3958 BFD_FAIL ();
3959 break;
3960 }
3961 }
3962 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3963 contents + rel->r_offset);
3964 continue;
3965 }
3966 else
3967 {
3968 unsigned int val, type;
3969
3970 /* {IE_32,GOTIE}->LE transition:
3971 Originally it can be one of:
3972 subl foo(%reg1), %reg2
3973 movl foo(%reg1), %reg2
3974 addl foo(%reg1), %reg2
3975 We change it into:
3976 subl $foo, %reg2
3977 movl $foo, %reg2 (6 byte form)
3978 addl $foo, %reg2. */
3979 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3980 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3981 if (type == 0x8b)
3982 {
3983 /* movl */
3984 bfd_put_8 (output_bfd, 0xc7,
3985 contents + rel->r_offset - 2);
3986 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3987 contents + rel->r_offset - 1);
3988 }
3989 else if (type == 0x2b)
3990 {
3991 /* subl */
3992 bfd_put_8 (output_bfd, 0x81,
3993 contents + rel->r_offset - 2);
3994 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3995 contents + rel->r_offset - 1);
3996 }
3997 else if (type == 0x03)
3998 {
3999 /* addl */
4000 bfd_put_8 (output_bfd, 0x81,
4001 contents + rel->r_offset - 2);
4002 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4003 contents + rel->r_offset - 1);
4004 }
4005 else
4006 BFD_FAIL ();
4007 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4008 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4009 contents + rel->r_offset);
4010 else
4011 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4012 contents + rel->r_offset);
4013 continue;
4014 }
4015 }
4016
4017 if (htab->elf.sgot == NULL)
4018 abort ();
4019
4020 if (h != NULL)
4021 {
4022 off = h->got.offset;
4023 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4024 }
4025 else
4026 {
4027 if (local_got_offsets == NULL)
4028 abort ();
4029
4030 off = local_got_offsets[r_symndx];
4031 offplt = local_tlsdesc_gotents[r_symndx];
4032 }
4033
4034 if ((off & 1) != 0)
4035 off &= ~1;
4036 else
4037 {
4038 Elf_Internal_Rela outrel;
4039 bfd_byte *loc;
4040 int dr_type;
4041 asection *sreloc;
4042
4043 if (htab->elf.srelgot == NULL)
4044 abort ();
4045
4046 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4047
4048 if (GOT_TLS_GDESC_P (tls_type))
4049 {
4050 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4051 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4052 <= htab->elf.sgotplt->size);
4053 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4054 + htab->elf.sgotplt->output_offset
4055 + offplt
4056 + htab->sgotplt_jump_table_size);
4057 sreloc = htab->elf.srelplt;
4058 loc = sreloc->contents;
4059 loc += (htab->next_tls_desc_index++
4060 * sizeof (Elf32_External_Rel));
4061 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4062 <= sreloc->contents + sreloc->size);
4063 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4064 if (indx == 0)
4065 {
4066 BFD_ASSERT (! unresolved_reloc);
4067 bfd_put_32 (output_bfd,
4068 relocation - elf_i386_dtpoff_base (info),
4069 htab->elf.sgotplt->contents + offplt
4070 + htab->sgotplt_jump_table_size + 4);
4071 }
4072 else
4073 {
4074 bfd_put_32 (output_bfd, 0,
4075 htab->elf.sgotplt->contents + offplt
4076 + htab->sgotplt_jump_table_size + 4);
4077 }
4078 }
4079
4080 sreloc = htab->elf.srelgot;
4081
4082 outrel.r_offset = (htab->elf.sgot->output_section->vma
4083 + htab->elf.sgot->output_offset + off);
4084
4085 if (GOT_TLS_GD_P (tls_type))
4086 dr_type = R_386_TLS_DTPMOD32;
4087 else if (GOT_TLS_GDESC_P (tls_type))
4088 goto dr_done;
4089 else if (tls_type == GOT_TLS_IE_POS)
4090 dr_type = R_386_TLS_TPOFF;
4091 else
4092 dr_type = R_386_TLS_TPOFF32;
4093
4094 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4095 bfd_put_32 (output_bfd,
4096 relocation - elf_i386_dtpoff_base (info),
4097 htab->elf.sgot->contents + off);
4098 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4099 bfd_put_32 (output_bfd,
4100 elf_i386_dtpoff_base (info) - relocation,
4101 htab->elf.sgot->contents + off);
4102 else if (dr_type != R_386_TLS_DESC)
4103 bfd_put_32 (output_bfd, 0,
4104 htab->elf.sgot->contents + off);
4105 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4106
4107 loc = sreloc->contents;
4108 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4109 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4110 <= sreloc->contents + sreloc->size);
4111 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4112
4113 if (GOT_TLS_GD_P (tls_type))
4114 {
4115 if (indx == 0)
4116 {
4117 BFD_ASSERT (! unresolved_reloc);
4118 bfd_put_32 (output_bfd,
4119 relocation - elf_i386_dtpoff_base (info),
4120 htab->elf.sgot->contents + off + 4);
4121 }
4122 else
4123 {
4124 bfd_put_32 (output_bfd, 0,
4125 htab->elf.sgot->contents + off + 4);
4126 outrel.r_info = ELF32_R_INFO (indx,
4127 R_386_TLS_DTPOFF32);
4128 outrel.r_offset += 4;
4129 sreloc->reloc_count++;
4130 loc += sizeof (Elf32_External_Rel);
4131 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4132 <= sreloc->contents + sreloc->size);
4133 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4134 }
4135 }
4136 else if (tls_type == GOT_TLS_IE_BOTH)
4137 {
4138 bfd_put_32 (output_bfd,
4139 (indx == 0
4140 ? relocation - elf_i386_dtpoff_base (info)
4141 : 0),
4142 htab->elf.sgot->contents + off + 4);
4143 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4144 outrel.r_offset += 4;
4145 sreloc->reloc_count++;
4146 loc += sizeof (Elf32_External_Rel);
4147 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4148 }
4149
4150 dr_done:
4151 if (h != NULL)
4152 h->got.offset |= 1;
4153 else
4154 local_got_offsets[r_symndx] |= 1;
4155 }
4156
4157 if (off >= (bfd_vma) -2
4158 && ! GOT_TLS_GDESC_P (tls_type))
4159 abort ();
4160 if (r_type == R_386_TLS_GOTDESC
4161 || r_type == R_386_TLS_DESC_CALL)
4162 {
4163 relocation = htab->sgotplt_jump_table_size + offplt;
4164 unresolved_reloc = FALSE;
4165 }
4166 else if (r_type == ELF32_R_TYPE (rel->r_info))
4167 {
4168 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4169 + htab->elf.sgotplt->output_offset;
4170 relocation = htab->elf.sgot->output_section->vma
4171 + htab->elf.sgot->output_offset + off - g_o_t;
4172 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4173 && tls_type == GOT_TLS_IE_BOTH)
4174 relocation += 4;
4175 if (r_type == R_386_TLS_IE)
4176 relocation += g_o_t;
4177 unresolved_reloc = FALSE;
4178 }
4179 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4180 {
4181 unsigned int val, type;
4182 bfd_vma roff;
4183
4184 /* GD->IE transition. */
4185 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4186 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4187 if (type == 0x04)
4188 {
4189 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4190 Change it into:
4191 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4192 val >>= 3;
4193 roff = rel->r_offset - 3;
4194 }
4195 else
4196 {
4197 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4198 Change it into:
4199 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4200 roff = rel->r_offset - 2;
4201 }
4202 memcpy (contents + roff,
4203 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4204 contents[roff + 7] = 0x80 | (val & 7);
4205 /* If foo is used only with foo@gotntpoff(%reg) and
4206 foo@indntpoff, but not with foo@gottpoff(%reg), change
4207 subl $foo@gottpoff(%reg), %eax
4208 into:
4209 addl $foo@gotntpoff(%reg), %eax. */
4210 if (tls_type == GOT_TLS_IE_POS)
4211 contents[roff + 6] = 0x03;
4212 bfd_put_32 (output_bfd,
4213 htab->elf.sgot->output_section->vma
4214 + htab->elf.sgot->output_offset + off
4215 - htab->elf.sgotplt->output_section->vma
4216 - htab->elf.sgotplt->output_offset,
4217 contents + roff + 8);
4218 /* Skip R_386_PLT32. */
4219 rel++;
4220 continue;
4221 }
4222 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4223 {
4224 /* GDesc -> IE transition.
4225 It's originally something like:
4226 leal x@tlsdesc(%ebx), %eax
4227
4228 Change it to:
4229 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4230 or:
4231 movl x@gottpoff(%ebx), %eax # before negl %eax
4232
4233 Registers other than %eax may be set up here. */
4234
4235 bfd_vma roff;
4236
4237 /* First, make sure it's a leal adding ebx to a 32-bit
4238 offset into any register, although it's probably
4239 almost always going to be eax. */
4240 roff = rel->r_offset;
4241
4242 /* Now modify the instruction as appropriate. */
4243 /* To turn a leal into a movl in the form we use it, it
4244 suffices to change the first byte from 0x8d to 0x8b.
4245 aoliva FIXME: should we decide to keep the leal, all
4246 we have to do is remove the statement below, and
4247 adjust the relaxation of R_386_TLS_DESC_CALL. */
4248 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4249
4250 if (tls_type == GOT_TLS_IE_BOTH)
4251 off += 4;
4252
4253 bfd_put_32 (output_bfd,
4254 htab->elf.sgot->output_section->vma
4255 + htab->elf.sgot->output_offset + off
4256 - htab->elf.sgotplt->output_section->vma
4257 - htab->elf.sgotplt->output_offset,
4258 contents + roff);
4259 continue;
4260 }
4261 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4262 {
4263 /* GDesc -> IE transition.
4264 It's originally:
4265 call *(%eax)
4266
4267 Change it to:
4268 xchg %ax,%ax
4269 or
4270 negl %eax
4271 depending on how we transformed the TLS_GOTDESC above.
4272 */
4273
4274 bfd_vma roff;
4275
4276 roff = rel->r_offset;
4277
4278 /* Now modify the instruction as appropriate. */
4279 if (tls_type != GOT_TLS_IE_NEG)
4280 {
4281 /* xchg %ax,%ax */
4282 bfd_put_8 (output_bfd, 0x66, contents + roff);
4283 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4284 }
4285 else
4286 {
4287 /* negl %eax */
4288 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4289 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4290 }
4291
4292 continue;
4293 }
4294 else
4295 BFD_ASSERT (FALSE);
4296 break;
4297
4298 case R_386_TLS_LDM:
4299 if (! elf_i386_tls_transition (info, input_bfd,
4300 input_section, contents,
4301 symtab_hdr, sym_hashes,
4302 &r_type, GOT_UNKNOWN, rel,
4303 relend, h, r_symndx))
4304 return FALSE;
4305
4306 if (r_type != R_386_TLS_LDM)
4307 {
4308 /* LD->LE transition:
4309 leal foo(%reg), %eax; call ___tls_get_addr.
4310 We change it into:
4311 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4312 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4313 memcpy (contents + rel->r_offset - 2,
4314 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4315 /* Skip R_386_PC32/R_386_PLT32. */
4316 rel++;
4317 continue;
4318 }
4319
4320 if (htab->elf.sgot == NULL)
4321 abort ();
4322
4323 off = htab->tls_ldm_got.offset;
4324 if (off & 1)
4325 off &= ~1;
4326 else
4327 {
4328 Elf_Internal_Rela outrel;
4329 bfd_byte *loc;
4330
4331 if (htab->elf.srelgot == NULL)
4332 abort ();
4333
4334 outrel.r_offset = (htab->elf.sgot->output_section->vma
4335 + htab->elf.sgot->output_offset + off);
4336
4337 bfd_put_32 (output_bfd, 0,
4338 htab->elf.sgot->contents + off);
4339 bfd_put_32 (output_bfd, 0,
4340 htab->elf.sgot->contents + off + 4);
4341 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4342 loc = htab->elf.srelgot->contents;
4343 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4344 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4345 htab->tls_ldm_got.offset |= 1;
4346 }
4347 relocation = htab->elf.sgot->output_section->vma
4348 + htab->elf.sgot->output_offset + off
4349 - htab->elf.sgotplt->output_section->vma
4350 - htab->elf.sgotplt->output_offset;
4351 unresolved_reloc = FALSE;
4352 break;
4353
4354 case R_386_TLS_LDO_32:
4355 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4356 relocation -= elf_i386_dtpoff_base (info);
4357 else
4358 /* When converting LDO to LE, we must negate. */
4359 relocation = -elf_i386_tpoff (info, relocation);
4360 break;
4361
4362 case R_386_TLS_LE_32:
4363 case R_386_TLS_LE:
4364 if (!info->executable)
4365 {
4366 Elf_Internal_Rela outrel;
4367 asection *sreloc;
4368 bfd_byte *loc;
4369
4370 outrel.r_offset = rel->r_offset
4371 + input_section->output_section->vma
4372 + input_section->output_offset;
4373 if (h != NULL && h->dynindx != -1)
4374 indx = h->dynindx;
4375 else
4376 indx = 0;
4377 if (r_type == R_386_TLS_LE_32)
4378 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4379 else
4380 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4381 sreloc = elf_section_data (input_section)->sreloc;
4382 if (sreloc == NULL)
4383 abort ();
4384 loc = sreloc->contents;
4385 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4386 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4387 if (indx)
4388 continue;
4389 else if (r_type == R_386_TLS_LE_32)
4390 relocation = elf_i386_dtpoff_base (info) - relocation;
4391 else
4392 relocation -= elf_i386_dtpoff_base (info);
4393 }
4394 else if (r_type == R_386_TLS_LE_32)
4395 relocation = elf_i386_tpoff (info, relocation);
4396 else
4397 relocation = -elf_i386_tpoff (info, relocation);
4398 break;
4399
4400 default:
4401 break;
4402 }
4403
4404 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4405 because such sections are not SEC_ALLOC and thus ld.so will
4406 not process them. */
4407 if (unresolved_reloc
4408 && !((input_section->flags & SEC_DEBUGGING) != 0
4409 && h->def_dynamic)
4410 && _bfd_elf_section_offset (output_bfd, info, input_section,
4411 rel->r_offset) != (bfd_vma) -1)
4412 {
4413 (*_bfd_error_handler)
4414 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4415 input_bfd,
4416 input_section,
4417 (long) rel->r_offset,
4418 howto->name,
4419 h->root.root.string);
4420 return FALSE;
4421 }
4422
4423 do_relocation:
4424 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4425 contents, rel->r_offset,
4426 relocation, 0);
4427
4428 check_relocation_error:
4429 if (r != bfd_reloc_ok)
4430 {
4431 const char *name;
4432
4433 if (h != NULL)
4434 name = h->root.root.string;
4435 else
4436 {
4437 name = bfd_elf_string_from_elf_section (input_bfd,
4438 symtab_hdr->sh_link,
4439 sym->st_name);
4440 if (name == NULL)
4441 return FALSE;
4442 if (*name == '\0')
4443 name = bfd_section_name (input_bfd, sec);
4444 }
4445
4446 if (r == bfd_reloc_overflow)
4447 {
4448 if (! ((*info->callbacks->reloc_overflow)
4449 (info, (h ? &h->root : NULL), name, howto->name,
4450 (bfd_vma) 0, input_bfd, input_section,
4451 rel->r_offset)))
4452 return FALSE;
4453 }
4454 else
4455 {
4456 (*_bfd_error_handler)
4457 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4458 input_bfd, input_section,
4459 (long) rel->r_offset, name, (int) r);
4460 return FALSE;
4461 }
4462 }
4463 }
4464
4465 return TRUE;
4466 }
4467
4468 /* Finish up dynamic symbol handling. We set the contents of various
4469 dynamic sections here. */
4470
4471 static bfd_boolean
4472 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4473 struct bfd_link_info *info,
4474 struct elf_link_hash_entry *h,
4475 Elf_Internal_Sym *sym)
4476 {
4477 struct elf_i386_link_hash_table *htab;
4478 unsigned plt_entry_size;
4479 const struct elf_i386_backend_data *abed;
4480
4481 htab = elf_i386_hash_table (info);
4482 if (htab == NULL)
4483 return FALSE;
4484
4485 abed = get_elf_i386_backend_data (output_bfd);
4486 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4487
4488 if (h->plt.offset != (bfd_vma) -1)
4489 {
4490 bfd_vma plt_index;
4491 bfd_vma got_offset;
4492 Elf_Internal_Rela rel;
4493 bfd_byte *loc;
4494 asection *plt, *gotplt, *relplt;
4495
4496 /* When building a static executable, use .iplt, .igot.plt and
4497 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4498 if (htab->elf.splt != NULL)
4499 {
4500 plt = htab->elf.splt;
4501 gotplt = htab->elf.sgotplt;
4502 relplt = htab->elf.srelplt;
4503 }
4504 else
4505 {
4506 plt = htab->elf.iplt;
4507 gotplt = htab->elf.igotplt;
4508 relplt = htab->elf.irelplt;
4509 }
4510
4511 /* This symbol has an entry in the procedure linkage table. Set
4512 it up. */
4513
4514 if ((h->dynindx == -1
4515 && !((h->forced_local || info->executable)
4516 && h->def_regular
4517 && h->type == STT_GNU_IFUNC))
4518 || plt == NULL
4519 || gotplt == NULL
4520 || relplt == NULL)
4521 return FALSE;
4522
4523 /* Get the index in the procedure linkage table which
4524 corresponds to this symbol. This is the index of this symbol
4525 in all the symbols for which we are making plt entries. The
4526 first entry in the procedure linkage table is reserved.
4527
4528 Get the offset into the .got table of the entry that
4529 corresponds to this function. Each .got entry is 4 bytes.
4530 The first three are reserved.
4531
4532 For static executables, we don't reserve anything. */
4533
4534 if (plt == htab->elf.splt)
4535 {
4536 got_offset = h->plt.offset / plt_entry_size - 1;
4537 got_offset = (got_offset + 3) * 4;
4538 }
4539 else
4540 {
4541 got_offset = h->plt.offset / plt_entry_size;
4542 got_offset = got_offset * 4;
4543 }
4544
4545 /* Fill in the entry in the procedure linkage table. */
4546 if (! info->shared)
4547 {
4548 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4549 abed->plt->plt_entry_size);
4550 bfd_put_32 (output_bfd,
4551 (gotplt->output_section->vma
4552 + gotplt->output_offset
4553 + got_offset),
4554 plt->contents + h->plt.offset
4555 + abed->plt->plt_got_offset);
4556
4557 if (abed->is_vxworks)
4558 {
4559 int s, k, reloc_index;
4560
4561 /* Create the R_386_32 relocation referencing the GOT
4562 for this PLT entry. */
4563
4564 /* S: Current slot number (zero-based). */
4565 s = ((h->plt.offset - abed->plt->plt_entry_size)
4566 / abed->plt->plt_entry_size);
4567 /* K: Number of relocations for PLTResolve. */
4568 if (info->shared)
4569 k = PLTRESOLVE_RELOCS_SHLIB;
4570 else
4571 k = PLTRESOLVE_RELOCS;
4572 /* Skip the PLTresolve relocations, and the relocations for
4573 the other PLT slots. */
4574 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4575 loc = (htab->srelplt2->contents + reloc_index
4576 * sizeof (Elf32_External_Rel));
4577
4578 rel.r_offset = (htab->elf.splt->output_section->vma
4579 + htab->elf.splt->output_offset
4580 + h->plt.offset + 2),
4581 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4582 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4583
4584 /* Create the R_386_32 relocation referencing the beginning of
4585 the PLT for this GOT entry. */
4586 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4587 + htab->elf.sgotplt->output_offset
4588 + got_offset);
4589 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4590 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4591 loc + sizeof (Elf32_External_Rel));
4592 }
4593 }
4594 else
4595 {
4596 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4597 abed->plt->plt_entry_size);
4598 bfd_put_32 (output_bfd, got_offset,
4599 plt->contents + h->plt.offset
4600 + abed->plt->plt_got_offset);
4601 }
4602
4603 /* Fill in the entry in the global offset table. */
4604 bfd_put_32 (output_bfd,
4605 (plt->output_section->vma
4606 + plt->output_offset
4607 + h->plt.offset
4608 + abed->plt->plt_lazy_offset),
4609 gotplt->contents + got_offset);
4610
4611 /* Fill in the entry in the .rel.plt section. */
4612 rel.r_offset = (gotplt->output_section->vma
4613 + gotplt->output_offset
4614 + got_offset);
4615 if (h->dynindx == -1
4616 || ((info->executable
4617 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4618 && h->def_regular
4619 && h->type == STT_GNU_IFUNC))
4620 {
4621 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4622 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4623 in the .got.plt section. */
4624 bfd_put_32 (output_bfd,
4625 (h->root.u.def.value
4626 + h->root.u.def.section->output_section->vma
4627 + h->root.u.def.section->output_offset),
4628 gotplt->contents + got_offset);
4629 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4630 /* R_386_IRELATIVE comes last. */
4631 plt_index = htab->next_irelative_index--;
4632 }
4633 else
4634 {
4635 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4636 plt_index = htab->next_jump_slot_index++;
4637 }
4638 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4639 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4640
4641 /* Don't fill PLT entry for static executables. */
4642 if (plt == htab->elf.splt)
4643 {
4644 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4645 plt->contents + h->plt.offset
4646 + abed->plt->plt_reloc_offset);
4647 bfd_put_32 (output_bfd, - (h->plt.offset
4648 + abed->plt->plt_plt_offset + 4),
4649 plt->contents + h->plt.offset
4650 + abed->plt->plt_plt_offset);
4651 }
4652
4653 if (!h->def_regular)
4654 {
4655 /* Mark the symbol as undefined, rather than as defined in
4656 the .plt section. Leave the value if there were any
4657 relocations where pointer equality matters (this is a clue
4658 for the dynamic linker, to make function pointer
4659 comparisons work between an application and shared
4660 library), otherwise set it to zero. If a function is only
4661 called from a binary, there is no need to slow down
4662 shared libraries because of that. */
4663 sym->st_shndx = SHN_UNDEF;
4664 if (!h->pointer_equality_needed)
4665 sym->st_value = 0;
4666 }
4667 }
4668
4669 if (h->got.offset != (bfd_vma) -1
4670 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4671 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4672 {
4673 Elf_Internal_Rela rel;
4674 bfd_byte *loc;
4675
4676 /* This symbol has an entry in the global offset table. Set it
4677 up. */
4678
4679 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4680 abort ();
4681
4682 rel.r_offset = (htab->elf.sgot->output_section->vma
4683 + htab->elf.sgot->output_offset
4684 + (h->got.offset & ~(bfd_vma) 1));
4685
4686 /* If this is a static link, or it is a -Bsymbolic link and the
4687 symbol is defined locally or was forced to be local because
4688 of a version file, we just want to emit a RELATIVE reloc.
4689 The entry in the global offset table will already have been
4690 initialized in the relocate_section function. */
4691 if (h->def_regular
4692 && h->type == STT_GNU_IFUNC)
4693 {
4694 if (info->shared)
4695 {
4696 /* Generate R_386_GLOB_DAT. */
4697 goto do_glob_dat;
4698 }
4699 else
4700 {
4701 asection *plt;
4702
4703 if (!h->pointer_equality_needed)
4704 abort ();
4705
4706 /* For non-shared object, we can't use .got.plt, which
4707 contains the real function addres if we need pointer
4708 equality. We load the GOT entry with the PLT entry. */
4709 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4710 bfd_put_32 (output_bfd,
4711 (plt->output_section->vma
4712 + plt->output_offset + h->plt.offset),
4713 htab->elf.sgot->contents + h->got.offset);
4714 return TRUE;
4715 }
4716 }
4717 else if (info->shared
4718 && SYMBOL_REFERENCES_LOCAL (info, h))
4719 {
4720 BFD_ASSERT((h->got.offset & 1) != 0);
4721 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4722 }
4723 else
4724 {
4725 BFD_ASSERT((h->got.offset & 1) == 0);
4726 do_glob_dat:
4727 bfd_put_32 (output_bfd, (bfd_vma) 0,
4728 htab->elf.sgot->contents + h->got.offset);
4729 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4730 }
4731
4732 loc = htab->elf.srelgot->contents;
4733 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4734 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4735 }
4736
4737 if (h->needs_copy)
4738 {
4739 Elf_Internal_Rela rel;
4740 bfd_byte *loc;
4741
4742 /* This symbol needs a copy reloc. Set it up. */
4743
4744 if (h->dynindx == -1
4745 || (h->root.type != bfd_link_hash_defined
4746 && h->root.type != bfd_link_hash_defweak)
4747 || htab->srelbss == NULL)
4748 abort ();
4749
4750 rel.r_offset = (h->root.u.def.value
4751 + h->root.u.def.section->output_section->vma
4752 + h->root.u.def.section->output_offset);
4753 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4754 loc = htab->srelbss->contents;
4755 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4756 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4757 }
4758
4759 return TRUE;
4760 }
4761
4762 /* Finish up local dynamic symbol handling. We set the contents of
4763 various dynamic sections here. */
4764
4765 static bfd_boolean
4766 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4767 {
4768 struct elf_link_hash_entry *h
4769 = (struct elf_link_hash_entry *) *slot;
4770 struct bfd_link_info *info
4771 = (struct bfd_link_info *) inf;
4772
4773 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4774 h, NULL);
4775 }
4776
4777 /* Used to decide how to sort relocs in an optimal manner for the
4778 dynamic linker, before writing them out. */
4779
4780 static enum elf_reloc_type_class
4781 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4782 {
4783 switch (ELF32_R_TYPE (rela->r_info))
4784 {
4785 case R_386_RELATIVE:
4786 return reloc_class_relative;
4787 case R_386_JUMP_SLOT:
4788 return reloc_class_plt;
4789 case R_386_COPY:
4790 return reloc_class_copy;
4791 default:
4792 return reloc_class_normal;
4793 }
4794 }
4795
4796 /* Finish up the dynamic sections. */
4797
4798 static bfd_boolean
4799 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4800 struct bfd_link_info *info)
4801 {
4802 struct elf_i386_link_hash_table *htab;
4803 bfd *dynobj;
4804 asection *sdyn;
4805 const struct elf_i386_backend_data *abed;
4806
4807 htab = elf_i386_hash_table (info);
4808 if (htab == NULL)
4809 return FALSE;
4810
4811 dynobj = htab->elf.dynobj;
4812 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4813 abed = get_elf_i386_backend_data (output_bfd);
4814
4815 if (htab->elf.dynamic_sections_created)
4816 {
4817 Elf32_External_Dyn *dyncon, *dynconend;
4818
4819 if (sdyn == NULL || htab->elf.sgot == NULL)
4820 abort ();
4821
4822 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4823 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4824 for (; dyncon < dynconend; dyncon++)
4825 {
4826 Elf_Internal_Dyn dyn;
4827 asection *s;
4828
4829 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4830
4831 switch (dyn.d_tag)
4832 {
4833 default:
4834 if (abed->is_vxworks
4835 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4836 break;
4837 continue;
4838
4839 case DT_PLTGOT:
4840 s = htab->elf.sgotplt;
4841 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4842 break;
4843
4844 case DT_JMPREL:
4845 s = htab->elf.srelplt;
4846 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4847 break;
4848
4849 case DT_PLTRELSZ:
4850 s = htab->elf.srelplt;
4851 dyn.d_un.d_val = s->size;
4852 break;
4853
4854 case DT_RELSZ:
4855 /* My reading of the SVR4 ABI indicates that the
4856 procedure linkage table relocs (DT_JMPREL) should be
4857 included in the overall relocs (DT_REL). This is
4858 what Solaris does. However, UnixWare can not handle
4859 that case. Therefore, we override the DT_RELSZ entry
4860 here to make it not include the JMPREL relocs. */
4861 s = htab->elf.srelplt;
4862 if (s == NULL)
4863 continue;
4864 dyn.d_un.d_val -= s->size;
4865 break;
4866
4867 case DT_REL:
4868 /* We may not be using the standard ELF linker script.
4869 If .rel.plt is the first .rel section, we adjust
4870 DT_REL to not include it. */
4871 s = htab->elf.srelplt;
4872 if (s == NULL)
4873 continue;
4874 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4875 continue;
4876 dyn.d_un.d_ptr += s->size;
4877 break;
4878 }
4879
4880 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4881 }
4882
4883 /* Fill in the first entry in the procedure linkage table. */
4884 if (htab->elf.splt && htab->elf.splt->size > 0)
4885 {
4886 if (info->shared)
4887 {
4888 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4889 abed->plt->plt0_entry_size);
4890 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4891 abed->plt0_pad_byte,
4892 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4893 }
4894 else
4895 {
4896 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4897 abed->plt->plt0_entry_size);
4898 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4899 abed->plt0_pad_byte,
4900 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4901 bfd_put_32 (output_bfd,
4902 (htab->elf.sgotplt->output_section->vma
4903 + htab->elf.sgotplt->output_offset
4904 + 4),
4905 htab->elf.splt->contents
4906 + abed->plt->plt0_got1_offset);
4907 bfd_put_32 (output_bfd,
4908 (htab->elf.sgotplt->output_section->vma
4909 + htab->elf.sgotplt->output_offset
4910 + 8),
4911 htab->elf.splt->contents
4912 + abed->plt->plt0_got2_offset);
4913
4914 if (abed->is_vxworks)
4915 {
4916 Elf_Internal_Rela rel;
4917
4918 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4919 On IA32 we use REL relocations so the addend goes in
4920 the PLT directly. */
4921 rel.r_offset = (htab->elf.splt->output_section->vma
4922 + htab->elf.splt->output_offset
4923 + abed->plt->plt0_got1_offset);
4924 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4925 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4926 htab->srelplt2->contents);
4927 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4928 rel.r_offset = (htab->elf.splt->output_section->vma
4929 + htab->elf.splt->output_offset
4930 + abed->plt->plt0_got2_offset);
4931 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4932 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4933 htab->srelplt2->contents +
4934 sizeof (Elf32_External_Rel));
4935 }
4936 }
4937
4938 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4939 really seem like the right value. */
4940 elf_section_data (htab->elf.splt->output_section)
4941 ->this_hdr.sh_entsize = 4;
4942
4943 /* Correct the .rel.plt.unloaded relocations. */
4944 if (abed->is_vxworks && !info->shared)
4945 {
4946 int num_plts = (htab->elf.splt->size
4947 / abed->plt->plt_entry_size) - 1;
4948 unsigned char *p;
4949
4950 p = htab->srelplt2->contents;
4951 if (info->shared)
4952 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4953 else
4954 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4955
4956 for (; num_plts; num_plts--)
4957 {
4958 Elf_Internal_Rela rel;
4959 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4960 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4961 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4962 p += sizeof (Elf32_External_Rel);
4963
4964 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4965 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4966 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4967 p += sizeof (Elf32_External_Rel);
4968 }
4969 }
4970 }
4971 }
4972
4973 if (htab->elf.sgotplt)
4974 {
4975 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4976 {
4977 (*_bfd_error_handler)
4978 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4979 return FALSE;
4980 }
4981
4982 /* Fill in the first three entries in the global offset table. */
4983 if (htab->elf.sgotplt->size > 0)
4984 {
4985 bfd_put_32 (output_bfd,
4986 (sdyn == NULL ? 0
4987 : sdyn->output_section->vma + sdyn->output_offset),
4988 htab->elf.sgotplt->contents);
4989 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4990 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4991 }
4992
4993 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4994 }
4995
4996 /* Adjust .eh_frame for .plt section. */
4997 if (htab->plt_eh_frame != NULL
4998 && htab->plt_eh_frame->contents != NULL)
4999 {
5000 if (htab->elf.splt != NULL
5001 && htab->elf.splt->size != 0
5002 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5003 && htab->elf.splt->output_section != NULL
5004 && htab->plt_eh_frame->output_section != NULL)
5005 {
5006 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5007 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5008 + htab->plt_eh_frame->output_offset
5009 + PLT_FDE_START_OFFSET;
5010 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5011 htab->plt_eh_frame->contents
5012 + PLT_FDE_START_OFFSET);
5013 }
5014 if (htab->plt_eh_frame->sec_info_type
5015 == SEC_INFO_TYPE_EH_FRAME)
5016 {
5017 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5018 htab->plt_eh_frame,
5019 htab->plt_eh_frame->contents))
5020 return FALSE;
5021 }
5022 }
5023
5024 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5025 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5026
5027 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5028 htab_traverse (htab->loc_hash_table,
5029 elf_i386_finish_local_dynamic_symbol,
5030 info);
5031
5032 return TRUE;
5033 }
5034
5035 /* Return address for Ith PLT stub in section PLT, for relocation REL
5036 or (bfd_vma) -1 if it should not be included. */
5037
5038 static bfd_vma
5039 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
5040 const arelent *rel ATTRIBUTE_UNUSED)
5041 {
5042 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5043 }
5044
5045 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5046
5047 static bfd_boolean
5048 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5049 {
5050 if (h->plt.offset != (bfd_vma) -1
5051 && !h->def_regular
5052 && !h->pointer_equality_needed)
5053 return FALSE;
5054
5055 return _bfd_elf_hash_symbol (h);
5056 }
5057
5058 /* Hook called by the linker routine which adds symbols from an object
5059 file. */
5060
5061 static bfd_boolean
5062 elf_i386_add_symbol_hook (bfd * abfd,
5063 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5064 Elf_Internal_Sym * sym,
5065 const char ** namep ATTRIBUTE_UNUSED,
5066 flagword * flagsp ATTRIBUTE_UNUSED,
5067 asection ** secp ATTRIBUTE_UNUSED,
5068 bfd_vma * valp ATTRIBUTE_UNUSED)
5069 {
5070 if ((abfd->flags & DYNAMIC) == 0
5071 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5072 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5073 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5074
5075 return TRUE;
5076 }
5077
5078 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5079 #define TARGET_LITTLE_NAME "elf32-i386"
5080 #define ELF_ARCH bfd_arch_i386
5081 #define ELF_TARGET_ID I386_ELF_DATA
5082 #define ELF_MACHINE_CODE EM_386
5083 #define ELF_MAXPAGESIZE 0x1000
5084
5085 #define elf_backend_can_gc_sections 1
5086 #define elf_backend_can_refcount 1
5087 #define elf_backend_want_got_plt 1
5088 #define elf_backend_plt_readonly 1
5089 #define elf_backend_want_plt_sym 0
5090 #define elf_backend_got_header_size 12
5091 #define elf_backend_plt_alignment 4
5092
5093 /* Support RELA for objdump of prelink objects. */
5094 #define elf_info_to_howto elf_i386_info_to_howto_rel
5095 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5096
5097 #define bfd_elf32_mkobject elf_i386_mkobject
5098
5099 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5100 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5101 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5102 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5103 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5104
5105 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5106 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5107 #define elf_backend_check_relocs elf_i386_check_relocs
5108 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5109 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5110 #define elf_backend_fake_sections elf_i386_fake_sections
5111 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5112 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5113 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5114 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5115 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5116 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5117 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5118 #define elf_backend_relocate_section elf_i386_relocate_section
5119 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5120 #define elf_backend_always_size_sections elf_i386_always_size_sections
5121 #define elf_backend_omit_section_dynsym \
5122 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5123 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5124 #define elf_backend_hash_symbol elf_i386_hash_symbol
5125 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5126 #undef elf_backend_post_process_headers
5127 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5128
5129 #include "elf32-target.h"
5130
5131 /* FreeBSD support. */
5132
5133 #undef TARGET_LITTLE_SYM
5134 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5135 #undef TARGET_LITTLE_NAME
5136 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5137 #undef ELF_OSABI
5138 #define ELF_OSABI ELFOSABI_FREEBSD
5139
5140 /* The kernel recognizes executables as valid only if they carry a
5141 "FreeBSD" label in the ELF header. So we put this label on all
5142 executables and (for simplicity) also all other object files. */
5143
5144 static void
5145 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5146 {
5147 _bfd_elf_set_osabi (abfd, info);
5148
5149 #ifdef OLD_FREEBSD_ABI_LABEL
5150 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5151 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5152 #endif
5153 }
5154
5155 #undef elf_backend_post_process_headers
5156 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5157 #undef elf32_bed
5158 #define elf32_bed elf32_i386_fbsd_bed
5159
5160 #undef elf_backend_add_symbol_hook
5161
5162 #include "elf32-target.h"
5163
5164 /* Solaris 2. */
5165
5166 #undef TARGET_LITTLE_SYM
5167 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5168 #undef TARGET_LITTLE_NAME
5169 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5170
5171 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5172 objects won't be recognized. */
5173 #undef ELF_OSABI
5174
5175 #undef elf32_bed
5176 #define elf32_bed elf32_i386_sol2_bed
5177
5178 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5179 boundary. */
5180 #undef elf_backend_static_tls_alignment
5181 #define elf_backend_static_tls_alignment 8
5182
5183 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5184
5185 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5186 File, p.63. */
5187 #undef elf_backend_want_plt_sym
5188 #define elf_backend_want_plt_sym 1
5189
5190 #include "elf32-target.h"
5191
5192 /* Native Client support. */
5193
5194 #undef TARGET_LITTLE_SYM
5195 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5196 #undef TARGET_LITTLE_NAME
5197 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5198 #undef elf32_bed
5199 #define elf32_bed elf32_i386_nacl_bed
5200
5201 #undef ELF_MAXPAGESIZE
5202 #define ELF_MAXPAGESIZE 0x10000
5203
5204 /* Restore defaults. */
5205 #undef ELF_OSABI
5206 #undef elf_backend_want_plt_sym
5207 #define elf_backend_want_plt_sym 0
5208 #undef elf_backend_post_process_headers
5209 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5210 #undef elf_backend_static_tls_alignment
5211
5212 /* NaCl uses substantially different PLT entries for the same effects. */
5213
5214 #undef elf_backend_plt_alignment
5215 #define elf_backend_plt_alignment 5
5216 #define NACL_PLT_ENTRY_SIZE 64
5217 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5218
5219 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5220 {
5221 0xff, 0x35, /* pushl contents of address */
5222 0, 0, 0, 0, /* replaced with address of .got + 4. */
5223 0x8b, 0x0d, /* movl contents of address, %ecx */
5224 0, 0, 0, 0, /* replaced with address of .got + 8. */
5225 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5226 0xff, 0xe1 /* jmp *%ecx */
5227 };
5228
5229 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5230 {
5231 0x8b, 0x0d, /* movl contents of address, %ecx */
5232 0, 0, 0, 0, /* replaced with GOT slot address. */
5233 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5234 0xff, 0xe1, /* jmp *%ecx */
5235
5236 /* Pad to the next 32-byte boundary with nop instructions. */
5237 0x90,
5238 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5239 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5240
5241 /* Lazy GOT entries point here (32-byte aligned). */
5242 0x68, /* pushl immediate */
5243 0, 0, 0, 0, /* replaced with reloc offset. */
5244 0xe9, /* jmp relative */
5245 0, 0, 0, 0, /* replaced with offset to .plt. */
5246
5247 /* Pad to the next 32-byte boundary with nop instructions. */
5248 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5249 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5250 0x90, 0x90
5251 };
5252
5253 static const bfd_byte
5254 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5255 {
5256 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5257 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5258 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5259 0xff, 0xe1, /* jmp *%ecx */
5260
5261 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5262 so pad to that size with nop instructions. */
5263 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5264 };
5265
5266 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5267 {
5268 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5269 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5270 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5271 0xff, 0xe1, /* jmp *%ecx */
5272
5273 /* Pad to the next 32-byte boundary with nop instructions. */
5274 0x90,
5275 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5276 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5277
5278 /* Lazy GOT entries point here (32-byte aligned). */
5279 0x68, /* pushl immediate */
5280 0, 0, 0, 0, /* replaced with offset into relocation table. */
5281 0xe9, /* jmp relative */
5282 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5283
5284 /* Pad to the next 32-byte boundary with nop instructions. */
5285 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5286 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5287 0x90, 0x90
5288 };
5289
5290 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5291 {
5292 #if (PLT_CIE_LENGTH != 20 \
5293 || PLT_FDE_LENGTH != 36 \
5294 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5295 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5296 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5297 #endif
5298 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5299 0, 0, 0, 0, /* CIE ID */
5300 1, /* CIE version */
5301 'z', 'R', 0, /* Augmentation string */
5302 1, /* Code alignment factor */
5303 0x7c, /* Data alignment factor: -4 */
5304 8, /* Return address column */
5305 1, /* Augmentation size */
5306 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5307 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5308 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5309 DW_CFA_nop, DW_CFA_nop,
5310
5311 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5312 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5313 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5314 0, 0, 0, 0, /* .plt size goes here */
5315 0, /* Augmentation size */
5316 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5317 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5318 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5319 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5320 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5321 13, /* Block length */
5322 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5323 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5324 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5325 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5326 DW_CFA_nop, DW_CFA_nop
5327 };
5328
5329 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5330 {
5331 elf_i386_nacl_plt0_entry, /* plt0_entry */
5332 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5333 2, /* plt0_got1_offset */
5334 8, /* plt0_got2_offset */
5335 elf_i386_nacl_plt_entry, /* plt_entry */
5336 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5337 2, /* plt_got_offset */
5338 33, /* plt_reloc_offset */
5339 38, /* plt_plt_offset */
5340 32, /* plt_lazy_offset */
5341 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5342 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5343 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5344 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5345 };
5346
5347 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5348 {
5349 &elf_i386_nacl_plt, /* plt */
5350 0x90, /* plt0_pad_byte: nop insn */
5351 0, /* is_vxworks */
5352 };
5353
5354 #undef elf_backend_arch_data
5355 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5356
5357 #undef elf_backend_modify_segment_map
5358 #define elf_backend_modify_segment_map nacl_modify_segment_map
5359 #undef elf_backend_modify_program_headers
5360 #define elf_backend_modify_program_headers nacl_modify_program_headers
5361
5362 #include "elf32-target.h"
5363
5364 /* Restore defaults. */
5365 #undef elf_backend_modify_segment_map
5366 #undef elf_backend_modify_program_headers
5367
5368 /* VxWorks support. */
5369
5370 #undef TARGET_LITTLE_SYM
5371 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5372 #undef TARGET_LITTLE_NAME
5373 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5374 #undef ELF_OSABI
5375 #undef elf_backend_plt_alignment
5376 #define elf_backend_plt_alignment 4
5377
5378 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5379 {
5380 &elf_i386_plt, /* plt */
5381 0x90, /* plt0_pad_byte */
5382 1, /* is_vxworks */
5383 };
5384
5385 #undef elf_backend_arch_data
5386 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5387
5388 #undef elf_backend_relocs_compatible
5389 #undef elf_backend_post_process_headers
5390 #undef elf_backend_add_symbol_hook
5391 #define elf_backend_add_symbol_hook \
5392 elf_vxworks_add_symbol_hook
5393 #undef elf_backend_link_output_symbol_hook
5394 #define elf_backend_link_output_symbol_hook \
5395 elf_vxworks_link_output_symbol_hook
5396 #undef elf_backend_emit_relocs
5397 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5398 #undef elf_backend_final_write_processing
5399 #define elf_backend_final_write_processing \
5400 elf_vxworks_final_write_processing
5401 #undef elf_backend_static_tls_alignment
5402
5403 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5404 define it. */
5405 #undef elf_backend_want_plt_sym
5406 #define elf_backend_want_plt_sym 1
5407
5408 #undef elf32_bed
5409 #define elf32_bed elf32_i386_vxworks_bed
5410
5411 #include "elf32-target.h"
GDB Binutils - Deliverables
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