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