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Reindent elf_i386_finish_dynamic_symbol
[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 /* It is referenced by a non-shared object. */
1521 h->ref_regular = 1;
1522 }
1523
1524 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1525 symtab_hdr, sym_hashes,
1526 &r_type, GOT_UNKNOWN,
1527 rel, rel_end, h, r_symndx))
1528 return FALSE;
1529
1530 switch (r_type)
1531 {
1532 case R_386_TLS_LDM:
1533 htab->tls_ldm_got.refcount += 1;
1534 goto create_got;
1535
1536 case R_386_PLT32:
1537 /* This symbol requires a procedure linkage table entry. We
1538 actually build the entry in adjust_dynamic_symbol,
1539 because this might be a case of linking PIC code which is
1540 never referenced by a dynamic object, in which case we
1541 don't need to generate a procedure linkage table entry
1542 after all. */
1543
1544 /* If this is a local symbol, we resolve it directly without
1545 creating a procedure linkage table entry. */
1546 if (h == NULL)
1547 continue;
1548
1549 h->needs_plt = 1;
1550 h->plt.refcount += 1;
1551 break;
1552
1553 case R_386_TLS_IE_32:
1554 case R_386_TLS_IE:
1555 case R_386_TLS_GOTIE:
1556 if (!info->executable)
1557 info->flags |= DF_STATIC_TLS;
1558 /* Fall through */
1559
1560 case R_386_GOT32:
1561 case R_386_TLS_GD:
1562 case R_386_TLS_GOTDESC:
1563 case R_386_TLS_DESC_CALL:
1564 /* This symbol requires a global offset table entry. */
1565 {
1566 int tls_type, old_tls_type;
1567
1568 switch (r_type)
1569 {
1570 default:
1571 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1572 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1573 case R_386_TLS_GOTDESC:
1574 case R_386_TLS_DESC_CALL:
1575 tls_type = GOT_TLS_GDESC; break;
1576 case R_386_TLS_IE_32:
1577 if (ELF32_R_TYPE (rel->r_info) == r_type)
1578 tls_type = GOT_TLS_IE_NEG;
1579 else
1580 /* If this is a GD->IE transition, we may use either of
1581 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1582 tls_type = GOT_TLS_IE;
1583 break;
1584 case R_386_TLS_IE:
1585 case R_386_TLS_GOTIE:
1586 tls_type = GOT_TLS_IE_POS; break;
1587 }
1588
1589 if (h != NULL)
1590 {
1591 h->got.refcount += 1;
1592 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1593 }
1594 else
1595 {
1596 bfd_signed_vma *local_got_refcounts;
1597
1598 /* This is a global offset table entry for a local symbol. */
1599 local_got_refcounts = elf_local_got_refcounts (abfd);
1600 if (local_got_refcounts == NULL)
1601 {
1602 bfd_size_type size;
1603
1604 size = symtab_hdr->sh_info;
1605 size *= (sizeof (bfd_signed_vma)
1606 + sizeof (bfd_vma) + sizeof(char));
1607 local_got_refcounts = (bfd_signed_vma *)
1608 bfd_zalloc (abfd, size);
1609 if (local_got_refcounts == NULL)
1610 return FALSE;
1611 elf_local_got_refcounts (abfd) = local_got_refcounts;
1612 elf_i386_local_tlsdesc_gotent (abfd)
1613 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1614 elf_i386_local_got_tls_type (abfd)
1615 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1616 }
1617 local_got_refcounts[r_symndx] += 1;
1618 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1619 }
1620
1621 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1622 tls_type |= old_tls_type;
1623 /* If a TLS symbol is accessed using IE at least once,
1624 there is no point to use dynamic model for it. */
1625 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1626 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1627 || (tls_type & GOT_TLS_IE) == 0))
1628 {
1629 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1630 tls_type = old_tls_type;
1631 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1632 && GOT_TLS_GD_ANY_P (tls_type))
1633 tls_type |= old_tls_type;
1634 else
1635 {
1636 if (h)
1637 name = h->root.root.string;
1638 else
1639 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1640 NULL);
1641 (*_bfd_error_handler)
1642 (_("%B: `%s' accessed both as normal and "
1643 "thread local symbol"),
1644 abfd, name);
1645 return FALSE;
1646 }
1647 }
1648
1649 if (old_tls_type != tls_type)
1650 {
1651 if (h != NULL)
1652 elf_i386_hash_entry (h)->tls_type = tls_type;
1653 else
1654 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1655 }
1656 }
1657 /* Fall through */
1658
1659 case R_386_GOTOFF:
1660 case R_386_GOTPC:
1661 create_got:
1662 if (htab->elf.sgot == NULL)
1663 {
1664 if (htab->elf.dynobj == NULL)
1665 htab->elf.dynobj = abfd;
1666 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1667 return FALSE;
1668 }
1669 if (r_type != R_386_TLS_IE)
1670 break;
1671 /* Fall through */
1672
1673 case R_386_TLS_LE_32:
1674 case R_386_TLS_LE:
1675 if (info->executable)
1676 break;
1677 info->flags |= DF_STATIC_TLS;
1678 /* Fall through */
1679
1680 case R_386_32:
1681 case R_386_PC32:
1682 if (h != NULL && info->executable)
1683 {
1684 /* If this reloc is in a read-only section, we might
1685 need a copy reloc. We can't check reliably at this
1686 stage whether the section is read-only, as input
1687 sections have not yet been mapped to output sections.
1688 Tentatively set the flag for now, and correct in
1689 adjust_dynamic_symbol. */
1690 h->non_got_ref = 1;
1691
1692 /* We may need a .plt entry if the function this reloc
1693 refers to is in a shared lib. */
1694 h->plt.refcount += 1;
1695 if (r_type != R_386_PC32)
1696 h->pointer_equality_needed = 1;
1697 }
1698
1699 /* If we are creating a shared library, and this is a reloc
1700 against a global symbol, or a non PC relative reloc
1701 against a local symbol, then we need to copy the reloc
1702 into the shared library. However, if we are linking with
1703 -Bsymbolic, we do not need to copy a reloc against a
1704 global symbol which is defined in an object we are
1705 including in the link (i.e., DEF_REGULAR is set). At
1706 this point we have not seen all the input files, so it is
1707 possible that DEF_REGULAR is not set now but will be set
1708 later (it is never cleared). In case of a weak definition,
1709 DEF_REGULAR may be cleared later by a strong definition in
1710 a shared library. We account for that possibility below by
1711 storing information in the relocs_copied field of the hash
1712 table entry. A similar situation occurs when creating
1713 shared libraries and symbol visibility changes render the
1714 symbol local.
1715
1716 If on the other hand, we are creating an executable, we
1717 may need to keep relocations for symbols satisfied by a
1718 dynamic library if we manage to avoid copy relocs for the
1719 symbol. */
1720 if ((info->shared
1721 && (sec->flags & SEC_ALLOC) != 0
1722 && (r_type != R_386_PC32
1723 || (h != NULL
1724 && (! SYMBOLIC_BIND (info, h)
1725 || h->root.type == bfd_link_hash_defweak
1726 || !h->def_regular))))
1727 || (ELIMINATE_COPY_RELOCS
1728 && !info->shared
1729 && (sec->flags & SEC_ALLOC) != 0
1730 && h != NULL
1731 && (h->root.type == bfd_link_hash_defweak
1732 || !h->def_regular)))
1733 {
1734 struct elf_dyn_relocs *p;
1735 struct elf_dyn_relocs **head;
1736
1737 /* We must copy these reloc types into the output file.
1738 Create a reloc section in dynobj and make room for
1739 this reloc. */
1740 if (sreloc == NULL)
1741 {
1742 if (htab->elf.dynobj == NULL)
1743 htab->elf.dynobj = abfd;
1744
1745 sreloc = _bfd_elf_make_dynamic_reloc_section
1746 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1747
1748 if (sreloc == NULL)
1749 return FALSE;
1750 }
1751
1752 /* If this is a global symbol, we count the number of
1753 relocations we need for this symbol. */
1754 if (h != NULL)
1755 {
1756 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1757 }
1758 else
1759 {
1760 /* Track dynamic relocs needed for local syms too.
1761 We really need local syms available to do this
1762 easily. Oh well. */
1763 void **vpp;
1764 asection *s;
1765
1766 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1767 abfd, r_symndx);
1768 if (isym == NULL)
1769 return FALSE;
1770
1771 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1772 if (s == NULL)
1773 s = sec;
1774
1775 vpp = &elf_section_data (s)->local_dynrel;
1776 head = (struct elf_dyn_relocs **)vpp;
1777 }
1778
1779 p = *head;
1780 if (p == NULL || p->sec != sec)
1781 {
1782 bfd_size_type amt = sizeof *p;
1783 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1784 amt);
1785 if (p == NULL)
1786 return FALSE;
1787 p->next = *head;
1788 *head = p;
1789 p->sec = sec;
1790 p->count = 0;
1791 p->pc_count = 0;
1792 }
1793
1794 p->count += 1;
1795 if (r_type == R_386_PC32)
1796 p->pc_count += 1;
1797 }
1798 break;
1799
1800 /* This relocation describes the C++ object vtable hierarchy.
1801 Reconstruct it for later use during GC. */
1802 case R_386_GNU_VTINHERIT:
1803 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1804 return FALSE;
1805 break;
1806
1807 /* This relocation describes which C++ vtable entries are actually
1808 used. Record for later use during GC. */
1809 case R_386_GNU_VTENTRY:
1810 BFD_ASSERT (h != NULL);
1811 if (h != NULL
1812 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1813 return FALSE;
1814 break;
1815
1816 default:
1817 break;
1818 }
1819 }
1820
1821 return TRUE;
1822 }
1823
1824 /* Return the section that should be marked against GC for a given
1825 relocation. */
1826
1827 static asection *
1828 elf_i386_gc_mark_hook (asection *sec,
1829 struct bfd_link_info *info,
1830 Elf_Internal_Rela *rel,
1831 struct elf_link_hash_entry *h,
1832 Elf_Internal_Sym *sym)
1833 {
1834 if (h != NULL)
1835 switch (ELF32_R_TYPE (rel->r_info))
1836 {
1837 case R_386_GNU_VTINHERIT:
1838 case R_386_GNU_VTENTRY:
1839 return NULL;
1840 }
1841
1842 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1843 }
1844
1845 /* Update the got entry reference counts for the section being removed. */
1846
1847 static bfd_boolean
1848 elf_i386_gc_sweep_hook (bfd *abfd,
1849 struct bfd_link_info *info,
1850 asection *sec,
1851 const Elf_Internal_Rela *relocs)
1852 {
1853 struct elf_i386_link_hash_table *htab;
1854 Elf_Internal_Shdr *symtab_hdr;
1855 struct elf_link_hash_entry **sym_hashes;
1856 bfd_signed_vma *local_got_refcounts;
1857 const Elf_Internal_Rela *rel, *relend;
1858
1859 if (info->relocatable)
1860 return TRUE;
1861
1862 htab = elf_i386_hash_table (info);
1863 if (htab == NULL)
1864 return FALSE;
1865
1866 elf_section_data (sec)->local_dynrel = NULL;
1867
1868 symtab_hdr = &elf_symtab_hdr (abfd);
1869 sym_hashes = elf_sym_hashes (abfd);
1870 local_got_refcounts = elf_local_got_refcounts (abfd);
1871
1872 relend = relocs + sec->reloc_count;
1873 for (rel = relocs; rel < relend; rel++)
1874 {
1875 unsigned long r_symndx;
1876 unsigned int r_type;
1877 struct elf_link_hash_entry *h = NULL;
1878
1879 r_symndx = ELF32_R_SYM (rel->r_info);
1880 if (r_symndx >= symtab_hdr->sh_info)
1881 {
1882 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1883 while (h->root.type == bfd_link_hash_indirect
1884 || h->root.type == bfd_link_hash_warning)
1885 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1886 }
1887 else
1888 {
1889 /* A local symbol. */
1890 Elf_Internal_Sym *isym;
1891
1892 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1893 abfd, r_symndx);
1894
1895 /* Check relocation against local STT_GNU_IFUNC symbol. */
1896 if (isym != NULL
1897 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1898 {
1899 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1900 if (h == NULL)
1901 abort ();
1902 }
1903 }
1904
1905 if (h)
1906 {
1907 struct elf_i386_link_hash_entry *eh;
1908 struct elf_dyn_relocs **pp;
1909 struct elf_dyn_relocs *p;
1910
1911 eh = (struct elf_i386_link_hash_entry *) h;
1912 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1913 if (p->sec == sec)
1914 {
1915 /* Everything must go for SEC. */
1916 *pp = p->next;
1917 break;
1918 }
1919 }
1920
1921 r_type = ELF32_R_TYPE (rel->r_info);
1922 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1923 symtab_hdr, sym_hashes,
1924 &r_type, GOT_UNKNOWN,
1925 rel, relend, h, r_symndx))
1926 return FALSE;
1927
1928 switch (r_type)
1929 {
1930 case R_386_TLS_LDM:
1931 if (htab->tls_ldm_got.refcount > 0)
1932 htab->tls_ldm_got.refcount -= 1;
1933 break;
1934
1935 case R_386_TLS_GD:
1936 case R_386_TLS_GOTDESC:
1937 case R_386_TLS_DESC_CALL:
1938 case R_386_TLS_IE_32:
1939 case R_386_TLS_IE:
1940 case R_386_TLS_GOTIE:
1941 case R_386_GOT32:
1942 if (h != NULL)
1943 {
1944 if (h->got.refcount > 0)
1945 h->got.refcount -= 1;
1946 if (h->type == STT_GNU_IFUNC)
1947 {
1948 if (h->plt.refcount > 0)
1949 h->plt.refcount -= 1;
1950 }
1951 }
1952 else if (local_got_refcounts != NULL)
1953 {
1954 if (local_got_refcounts[r_symndx] > 0)
1955 local_got_refcounts[r_symndx] -= 1;
1956 }
1957 break;
1958
1959 case R_386_32:
1960 case R_386_PC32:
1961 if (info->shared
1962 && (h == NULL || h->type != STT_GNU_IFUNC))
1963 break;
1964 /* Fall through */
1965
1966 case R_386_PLT32:
1967 if (h != NULL)
1968 {
1969 if (h->plt.refcount > 0)
1970 h->plt.refcount -= 1;
1971 }
1972 break;
1973
1974 case R_386_GOTOFF:
1975 if (h != NULL && h->type == STT_GNU_IFUNC)
1976 {
1977 if (h->got.refcount > 0)
1978 h->got.refcount -= 1;
1979 if (h->plt.refcount > 0)
1980 h->plt.refcount -= 1;
1981 }
1982 break;
1983
1984 default:
1985 break;
1986 }
1987 }
1988
1989 return TRUE;
1990 }
1991
1992 /* Adjust a symbol defined by a dynamic object and referenced by a
1993 regular object. The current definition is in some section of the
1994 dynamic object, but we're not including those sections. We have to
1995 change the definition to something the rest of the link can
1996 understand. */
1997
1998 static bfd_boolean
1999 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2000 struct elf_link_hash_entry *h)
2001 {
2002 struct elf_i386_link_hash_table *htab;
2003 asection *s;
2004 struct elf_i386_link_hash_entry *eh;
2005 struct elf_dyn_relocs *p;
2006
2007 /* STT_GNU_IFUNC symbol must go through PLT. */
2008 if (h->type == STT_GNU_IFUNC)
2009 {
2010 /* All local STT_GNU_IFUNC references must be treate as local
2011 calls via local PLT. */
2012 if (h->ref_regular
2013 && SYMBOL_CALLS_LOCAL (info, h))
2014 {
2015 bfd_size_type pc_count = 0, count = 0;
2016 struct elf_dyn_relocs **pp;
2017
2018 eh = (struct elf_i386_link_hash_entry *) h;
2019 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2020 {
2021 pc_count += p->pc_count;
2022 p->count -= p->pc_count;
2023 p->pc_count = 0;
2024 count += p->count;
2025 if (p->count == 0)
2026 *pp = p->next;
2027 else
2028 pp = &p->next;
2029 }
2030
2031 if (pc_count || count)
2032 {
2033 h->needs_plt = 1;
2034 h->plt.refcount += 1;
2035 h->non_got_ref = 1;
2036 }
2037 }
2038
2039 if (h->plt.refcount <= 0)
2040 {
2041 h->plt.offset = (bfd_vma) -1;
2042 h->needs_plt = 0;
2043 }
2044 return TRUE;
2045 }
2046
2047 /* If this is a function, put it in the procedure linkage table. We
2048 will fill in the contents of the procedure linkage table later,
2049 when we know the address of the .got section. */
2050 if (h->type == STT_FUNC
2051 || h->needs_plt)
2052 {
2053 if (h->plt.refcount <= 0
2054 || SYMBOL_CALLS_LOCAL (info, h)
2055 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2056 && h->root.type == bfd_link_hash_undefweak))
2057 {
2058 /* This case can occur if we saw a PLT32 reloc in an input
2059 file, but the symbol was never referred to by a dynamic
2060 object, or if all references were garbage collected. In
2061 such a case, we don't actually need to build a procedure
2062 linkage table, and we can just do a PC32 reloc instead. */
2063 h->plt.offset = (bfd_vma) -1;
2064 h->needs_plt = 0;
2065 }
2066
2067 return TRUE;
2068 }
2069 else
2070 /* It's possible that we incorrectly decided a .plt reloc was
2071 needed for an R_386_PC32 reloc to a non-function sym in
2072 check_relocs. We can't decide accurately between function and
2073 non-function syms in check-relocs; Objects loaded later in
2074 the link may change h->type. So fix it now. */
2075 h->plt.offset = (bfd_vma) -1;
2076
2077 /* If this is a weak symbol, and there is a real definition, the
2078 processor independent code will have arranged for us to see the
2079 real definition first, and we can just use the same value. */
2080 if (h->u.weakdef != NULL)
2081 {
2082 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2083 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2084 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2085 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2086 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2087 h->non_got_ref = h->u.weakdef->non_got_ref;
2088 return TRUE;
2089 }
2090
2091 /* This is a reference to a symbol defined by a dynamic object which
2092 is not a function. */
2093
2094 /* If we are creating a shared library, we must presume that the
2095 only references to the symbol are via the global offset table.
2096 For such cases we need not do anything here; the relocations will
2097 be handled correctly by relocate_section. */
2098 if (info->shared)
2099 return TRUE;
2100
2101 /* If there are no references to this symbol that do not use the
2102 GOT, we don't need to generate a copy reloc. */
2103 if (!h->non_got_ref)
2104 return TRUE;
2105
2106 /* If -z nocopyreloc was given, we won't generate them either. */
2107 if (info->nocopyreloc)
2108 {
2109 h->non_got_ref = 0;
2110 return TRUE;
2111 }
2112
2113 htab = elf_i386_hash_table (info);
2114 if (htab == NULL)
2115 return FALSE;
2116
2117 /* If there aren't any dynamic relocs in read-only sections, then
2118 we can keep the dynamic relocs and avoid the copy reloc. This
2119 doesn't work on VxWorks, where we can not have dynamic relocations
2120 (other than copy and jump slot relocations) in an executable. */
2121 if (ELIMINATE_COPY_RELOCS
2122 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2123 {
2124 eh = (struct elf_i386_link_hash_entry *) h;
2125 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2126 {
2127 s = p->sec->output_section;
2128 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2129 break;
2130 }
2131
2132 if (p == NULL)
2133 {
2134 h->non_got_ref = 0;
2135 return TRUE;
2136 }
2137 }
2138
2139 /* We must allocate the symbol in our .dynbss section, which will
2140 become part of the .bss section of the executable. There will be
2141 an entry for this symbol in the .dynsym section. The dynamic
2142 object will contain position independent code, so all references
2143 from the dynamic object to this symbol will go through the global
2144 offset table. The dynamic linker will use the .dynsym entry to
2145 determine the address it must put in the global offset table, so
2146 both the dynamic object and the regular object will refer to the
2147 same memory location for the variable. */
2148
2149 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2150 copy the initial value out of the dynamic object and into the
2151 runtime process image. */
2152 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2153 {
2154 htab->srelbss->size += sizeof (Elf32_External_Rel);
2155 h->needs_copy = 1;
2156 }
2157
2158 s = htab->sdynbss;
2159
2160 return _bfd_elf_adjust_dynamic_copy (h, s);
2161 }
2162
2163 /* Allocate space in .plt, .got and associated reloc sections for
2164 dynamic relocs. */
2165
2166 static bfd_boolean
2167 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2168 {
2169 struct bfd_link_info *info;
2170 struct elf_i386_link_hash_table *htab;
2171 struct elf_i386_link_hash_entry *eh;
2172 struct elf_dyn_relocs *p;
2173 unsigned plt_entry_size;
2174
2175 if (h->root.type == bfd_link_hash_indirect)
2176 return TRUE;
2177
2178 eh = (struct elf_i386_link_hash_entry *) h;
2179
2180 info = (struct bfd_link_info *) inf;
2181 htab = elf_i386_hash_table (info);
2182 if (htab == NULL)
2183 return FALSE;
2184
2185 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2186
2187 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2188 here if it is defined and referenced in a non-shared object. */
2189 if (h->type == STT_GNU_IFUNC
2190 && h->def_regular)
2191 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2192 plt_entry_size, 4);
2193 else if (htab->elf.dynamic_sections_created
2194 && h->plt.refcount > 0)
2195 {
2196 /* Make sure this symbol is output as a dynamic symbol.
2197 Undefined weak syms won't yet be marked as dynamic. */
2198 if (h->dynindx == -1
2199 && !h->forced_local)
2200 {
2201 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2202 return FALSE;
2203 }
2204
2205 if (info->shared
2206 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2207 {
2208 asection *s = htab->elf.splt;
2209
2210 /* If this is the first .plt entry, make room for the special
2211 first entry. */
2212 if (s->size == 0)
2213 s->size += plt_entry_size;
2214
2215 h->plt.offset = s->size;
2216
2217 /* If this symbol is not defined in a regular file, and we are
2218 not generating a shared library, then set the symbol to this
2219 location in the .plt. This is required to make function
2220 pointers compare as equal between the normal executable and
2221 the shared library. */
2222 if (! info->shared
2223 && !h->def_regular)
2224 {
2225 h->root.u.def.section = s;
2226 h->root.u.def.value = h->plt.offset;
2227 }
2228
2229 /* Make room for this entry. */
2230 s->size += plt_entry_size;
2231
2232 /* We also need to make an entry in the .got.plt section, which
2233 will be placed in the .got section by the linker script. */
2234 htab->elf.sgotplt->size += 4;
2235
2236 /* We also need to make an entry in the .rel.plt section. */
2237 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2238 htab->elf.srelplt->reloc_count++;
2239
2240 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2241 && !info->shared)
2242 {
2243 /* VxWorks has a second set of relocations for each PLT entry
2244 in executables. They go in a separate relocation section,
2245 which is processed by the kernel loader. */
2246
2247 /* There are two relocations for the initial PLT entry: an
2248 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2249 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2250
2251 if (h->plt.offset == plt_entry_size)
2252 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2253
2254 /* There are two extra relocations for each subsequent PLT entry:
2255 an R_386_32 relocation for the GOT entry, and an R_386_32
2256 relocation for the PLT entry. */
2257
2258 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2259 }
2260 }
2261 else
2262 {
2263 h->plt.offset = (bfd_vma) -1;
2264 h->needs_plt = 0;
2265 }
2266 }
2267 else
2268 {
2269 h->plt.offset = (bfd_vma) -1;
2270 h->needs_plt = 0;
2271 }
2272
2273 eh->tlsdesc_got = (bfd_vma) -1;
2274
2275 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2276 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2277 if (h->got.refcount > 0
2278 && info->executable
2279 && h->dynindx == -1
2280 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2281 h->got.offset = (bfd_vma) -1;
2282 else if (h->got.refcount > 0)
2283 {
2284 asection *s;
2285 bfd_boolean dyn;
2286 int tls_type = elf_i386_hash_entry(h)->tls_type;
2287
2288 /* Make sure this symbol is output as a dynamic symbol.
2289 Undefined weak syms won't yet be marked as dynamic. */
2290 if (h->dynindx == -1
2291 && !h->forced_local)
2292 {
2293 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2294 return FALSE;
2295 }
2296
2297 s = htab->elf.sgot;
2298 if (GOT_TLS_GDESC_P (tls_type))
2299 {
2300 eh->tlsdesc_got = htab->elf.sgotplt->size
2301 - elf_i386_compute_jump_table_size (htab);
2302 htab->elf.sgotplt->size += 8;
2303 h->got.offset = (bfd_vma) -2;
2304 }
2305 if (! GOT_TLS_GDESC_P (tls_type)
2306 || GOT_TLS_GD_P (tls_type))
2307 {
2308 h->got.offset = s->size;
2309 s->size += 4;
2310 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2311 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2312 s->size += 4;
2313 }
2314 dyn = htab->elf.dynamic_sections_created;
2315 /* R_386_TLS_IE_32 needs one dynamic relocation,
2316 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2317 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2318 need two), R_386_TLS_GD needs one if local symbol and two if
2319 global. */
2320 if (tls_type == GOT_TLS_IE_BOTH)
2321 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2322 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2323 || (tls_type & GOT_TLS_IE))
2324 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2325 else if (GOT_TLS_GD_P (tls_type))
2326 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2327 else if (! GOT_TLS_GDESC_P (tls_type)
2328 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2329 || h->root.type != bfd_link_hash_undefweak)
2330 && (info->shared
2331 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2332 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2333 if (GOT_TLS_GDESC_P (tls_type))
2334 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2335 }
2336 else
2337 h->got.offset = (bfd_vma) -1;
2338
2339 if (eh->dyn_relocs == NULL)
2340 return TRUE;
2341
2342 /* In the shared -Bsymbolic case, discard space allocated for
2343 dynamic pc-relative relocs against symbols which turn out to be
2344 defined in regular objects. For the normal shared case, discard
2345 space for pc-relative relocs that have become local due to symbol
2346 visibility changes. */
2347
2348 if (info->shared)
2349 {
2350 /* The only reloc that uses pc_count is R_386_PC32, which will
2351 appear on a call or on something like ".long foo - .". We
2352 want calls to protected symbols to resolve directly to the
2353 function rather than going via the plt. If people want
2354 function pointer comparisons to work as expected then they
2355 should avoid writing assembly like ".long foo - .". */
2356 if (SYMBOL_CALLS_LOCAL (info, h))
2357 {
2358 struct elf_dyn_relocs **pp;
2359
2360 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2361 {
2362 p->count -= p->pc_count;
2363 p->pc_count = 0;
2364 if (p->count == 0)
2365 *pp = p->next;
2366 else
2367 pp = &p->next;
2368 }
2369 }
2370
2371 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2372 {
2373 struct elf_dyn_relocs **pp;
2374 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2375 {
2376 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2377 *pp = p->next;
2378 else
2379 pp = &p->next;
2380 }
2381 }
2382
2383 /* Also discard relocs on undefined weak syms with non-default
2384 visibility. */
2385 if (eh->dyn_relocs != NULL
2386 && h->root.type == bfd_link_hash_undefweak)
2387 {
2388 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2389 eh->dyn_relocs = NULL;
2390
2391 /* Make sure undefined weak symbols are output as a dynamic
2392 symbol in PIEs. */
2393 else if (h->dynindx == -1
2394 && !h->forced_local)
2395 {
2396 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2397 return FALSE;
2398 }
2399 }
2400 }
2401 else if (ELIMINATE_COPY_RELOCS)
2402 {
2403 /* For the non-shared case, discard space for relocs against
2404 symbols which turn out to need copy relocs or are not
2405 dynamic. */
2406
2407 if (!h->non_got_ref
2408 && ((h->def_dynamic
2409 && !h->def_regular)
2410 || (htab->elf.dynamic_sections_created
2411 && (h->root.type == bfd_link_hash_undefweak
2412 || h->root.type == bfd_link_hash_undefined))))
2413 {
2414 /* Make sure this symbol is output as a dynamic symbol.
2415 Undefined weak syms won't yet be marked as dynamic. */
2416 if (h->dynindx == -1
2417 && !h->forced_local)
2418 {
2419 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2420 return FALSE;
2421 }
2422
2423 /* If that succeeded, we know we'll be keeping all the
2424 relocs. */
2425 if (h->dynindx != -1)
2426 goto keep;
2427 }
2428
2429 eh->dyn_relocs = NULL;
2430
2431 keep: ;
2432 }
2433
2434 /* Finally, allocate space. */
2435 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2436 {
2437 asection *sreloc;
2438
2439 sreloc = elf_section_data (p->sec)->sreloc;
2440
2441 BFD_ASSERT (sreloc != NULL);
2442 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2443 }
2444
2445 return TRUE;
2446 }
2447
2448 /* Allocate space in .plt, .got and associated reloc sections for
2449 local dynamic relocs. */
2450
2451 static bfd_boolean
2452 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2453 {
2454 struct elf_link_hash_entry *h
2455 = (struct elf_link_hash_entry *) *slot;
2456
2457 if (h->type != STT_GNU_IFUNC
2458 || !h->def_regular
2459 || !h->ref_regular
2460 || !h->forced_local
2461 || h->root.type != bfd_link_hash_defined)
2462 abort ();
2463
2464 return elf_i386_allocate_dynrelocs (h, inf);
2465 }
2466
2467 /* Find any dynamic relocs that apply to read-only sections. */
2468
2469 static bfd_boolean
2470 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2471 {
2472 struct elf_i386_link_hash_entry *eh;
2473 struct elf_dyn_relocs *p;
2474
2475 /* Skip local IFUNC symbols. */
2476 if (h->forced_local && h->type == STT_GNU_IFUNC)
2477 return TRUE;
2478
2479 eh = (struct elf_i386_link_hash_entry *) h;
2480 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2481 {
2482 asection *s = p->sec->output_section;
2483
2484 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2485 {
2486 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2487
2488 info->flags |= DF_TEXTREL;
2489
2490 if (info->warn_shared_textrel && info->shared)
2491 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2492 p->sec->owner, h->root.root.string,
2493 p->sec);
2494
2495 /* Not an error, just cut short the traversal. */
2496 return FALSE;
2497 }
2498 }
2499 return TRUE;
2500 }
2501
2502 /* Convert
2503 mov foo@GOT(%reg), %reg
2504 to
2505 lea foo@GOTOFF(%reg), %reg
2506 with the local symbol, foo. */
2507
2508 static bfd_boolean
2509 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2510 struct bfd_link_info *link_info)
2511 {
2512 Elf_Internal_Shdr *symtab_hdr;
2513 Elf_Internal_Rela *internal_relocs;
2514 Elf_Internal_Rela *irel, *irelend;
2515 bfd_byte *contents;
2516 struct elf_i386_link_hash_table *htab;
2517 bfd_boolean changed_contents;
2518 bfd_boolean changed_relocs;
2519 bfd_signed_vma *local_got_refcounts;
2520
2521 /* Don't even try to convert non-ELF outputs. */
2522 if (!is_elf_hash_table (link_info->hash))
2523 return FALSE;
2524
2525 /* Nothing to do if there are no codes, no relocations or no output. */
2526 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2527 || sec->reloc_count == 0
2528 || discarded_section (sec))
2529 return TRUE;
2530
2531 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2532
2533 /* Load the relocations for this section. */
2534 internal_relocs = (_bfd_elf_link_read_relocs
2535 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2536 link_info->keep_memory));
2537 if (internal_relocs == NULL)
2538 return FALSE;
2539
2540 htab = elf_i386_hash_table (link_info);
2541 changed_contents = FALSE;
2542 changed_relocs = FALSE;
2543 local_got_refcounts = elf_local_got_refcounts (abfd);
2544
2545 /* Get the section contents. */
2546 if (elf_section_data (sec)->this_hdr.contents != NULL)
2547 contents = elf_section_data (sec)->this_hdr.contents;
2548 else
2549 {
2550 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2551 goto error_return;
2552 }
2553
2554 irelend = internal_relocs + sec->reloc_count;
2555 for (irel = internal_relocs; irel < irelend; irel++)
2556 {
2557 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2558 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2559 unsigned int indx;
2560 struct elf_link_hash_entry *h;
2561
2562 if (r_type != R_386_GOT32)
2563 continue;
2564
2565 /* Get the symbol referred to by the reloc. */
2566 if (r_symndx < symtab_hdr->sh_info)
2567 {
2568 Elf_Internal_Sym *isym;
2569
2570 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2571 abfd, r_symndx);
2572
2573 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2574 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2575 && bfd_get_8 (input_bfd,
2576 contents + irel->r_offset - 2) == 0x8b)
2577 {
2578 bfd_put_8 (output_bfd, 0x8d,
2579 contents + irel->r_offset - 2);
2580 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2581 if (local_got_refcounts != NULL
2582 && local_got_refcounts[r_symndx] > 0)
2583 local_got_refcounts[r_symndx] -= 1;
2584 changed_contents = TRUE;
2585 changed_relocs = TRUE;
2586 }
2587 continue;
2588 }
2589
2590 indx = r_symndx - symtab_hdr->sh_info;
2591 h = elf_sym_hashes (abfd)[indx];
2592 BFD_ASSERT (h != NULL);
2593
2594 while (h->root.type == bfd_link_hash_indirect
2595 || h->root.type == bfd_link_hash_warning)
2596 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2597
2598 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2599 optimizing _DYNAMIC since ld.so may use its link-time address. */
2600 if (h->def_regular
2601 && h->type != STT_GNU_IFUNC
2602 && h != htab->elf.hdynamic
2603 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2604 && bfd_get_8 (input_bfd,
2605 contents + irel->r_offset - 2) == 0x8b)
2606 {
2607 bfd_put_8 (output_bfd, 0x8d,
2608 contents + irel->r_offset - 2);
2609 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2610 if (h->got.refcount > 0)
2611 h->got.refcount -= 1;
2612 changed_contents = TRUE;
2613 changed_relocs = TRUE;
2614 }
2615 }
2616
2617 if (contents != NULL
2618 && elf_section_data (sec)->this_hdr.contents != contents)
2619 {
2620 if (!changed_contents && !link_info->keep_memory)
2621 free (contents);
2622 else
2623 {
2624 /* Cache the section contents for elf_link_input_bfd. */
2625 elf_section_data (sec)->this_hdr.contents = contents;
2626 }
2627 }
2628
2629 if (elf_section_data (sec)->relocs != internal_relocs)
2630 {
2631 if (!changed_relocs)
2632 free (internal_relocs);
2633 else
2634 elf_section_data (sec)->relocs = internal_relocs;
2635 }
2636
2637 return TRUE;
2638
2639 error_return:
2640 if (contents != NULL
2641 && elf_section_data (sec)->this_hdr.contents != contents)
2642 free (contents);
2643 if (internal_relocs != NULL
2644 && elf_section_data (sec)->relocs != internal_relocs)
2645 free (internal_relocs);
2646 return FALSE;
2647 }
2648
2649 /* Set the sizes of the dynamic sections. */
2650
2651 static bfd_boolean
2652 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2653 {
2654 struct elf_i386_link_hash_table *htab;
2655 bfd *dynobj;
2656 asection *s;
2657 bfd_boolean relocs;
2658 bfd *ibfd;
2659
2660 htab = elf_i386_hash_table (info);
2661 if (htab == NULL)
2662 return FALSE;
2663 dynobj = htab->elf.dynobj;
2664 if (dynobj == NULL)
2665 abort ();
2666
2667 if (htab->elf.dynamic_sections_created)
2668 {
2669 /* Set the contents of the .interp section to the interpreter. */
2670 if (info->executable)
2671 {
2672 s = bfd_get_linker_section (dynobj, ".interp");
2673 if (s == NULL)
2674 abort ();
2675 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2676 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2677 }
2678 }
2679
2680 /* Set up .got offsets for local syms, and space for local dynamic
2681 relocs. */
2682 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2683 {
2684 bfd_signed_vma *local_got;
2685 bfd_signed_vma *end_local_got;
2686 char *local_tls_type;
2687 bfd_vma *local_tlsdesc_gotent;
2688 bfd_size_type locsymcount;
2689 Elf_Internal_Shdr *symtab_hdr;
2690 asection *srel;
2691
2692 if (! is_i386_elf (ibfd))
2693 continue;
2694
2695 for (s = ibfd->sections; s != NULL; s = s->next)
2696 {
2697 struct elf_dyn_relocs *p;
2698
2699 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2700 return FALSE;
2701
2702 for (p = ((struct elf_dyn_relocs *)
2703 elf_section_data (s)->local_dynrel);
2704 p != NULL;
2705 p = p->next)
2706 {
2707 if (!bfd_is_abs_section (p->sec)
2708 && bfd_is_abs_section (p->sec->output_section))
2709 {
2710 /* Input section has been discarded, either because
2711 it is a copy of a linkonce section or due to
2712 linker script /DISCARD/, so we'll be discarding
2713 the relocs too. */
2714 }
2715 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2716 && strcmp (p->sec->output_section->name,
2717 ".tls_vars") == 0)
2718 {
2719 /* Relocations in vxworks .tls_vars sections are
2720 handled specially by the loader. */
2721 }
2722 else if (p->count != 0)
2723 {
2724 srel = elf_section_data (p->sec)->sreloc;
2725 srel->size += p->count * sizeof (Elf32_External_Rel);
2726 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2727 && (info->flags & DF_TEXTREL) == 0)
2728 {
2729 info->flags |= DF_TEXTREL;
2730 if (info->warn_shared_textrel && info->shared)
2731 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2732 p->sec->owner, p->sec);
2733 }
2734 }
2735 }
2736 }
2737
2738 local_got = elf_local_got_refcounts (ibfd);
2739 if (!local_got)
2740 continue;
2741
2742 symtab_hdr = &elf_symtab_hdr (ibfd);
2743 locsymcount = symtab_hdr->sh_info;
2744 end_local_got = local_got + locsymcount;
2745 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2746 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2747 s = htab->elf.sgot;
2748 srel = htab->elf.srelgot;
2749 for (; local_got < end_local_got;
2750 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2751 {
2752 *local_tlsdesc_gotent = (bfd_vma) -1;
2753 if (*local_got > 0)
2754 {
2755 if (GOT_TLS_GDESC_P (*local_tls_type))
2756 {
2757 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2758 - elf_i386_compute_jump_table_size (htab);
2759 htab->elf.sgotplt->size += 8;
2760 *local_got = (bfd_vma) -2;
2761 }
2762 if (! GOT_TLS_GDESC_P (*local_tls_type)
2763 || GOT_TLS_GD_P (*local_tls_type))
2764 {
2765 *local_got = s->size;
2766 s->size += 4;
2767 if (GOT_TLS_GD_P (*local_tls_type)
2768 || *local_tls_type == GOT_TLS_IE_BOTH)
2769 s->size += 4;
2770 }
2771 if (info->shared
2772 || GOT_TLS_GD_ANY_P (*local_tls_type)
2773 || (*local_tls_type & GOT_TLS_IE))
2774 {
2775 if (*local_tls_type == GOT_TLS_IE_BOTH)
2776 srel->size += 2 * sizeof (Elf32_External_Rel);
2777 else if (GOT_TLS_GD_P (*local_tls_type)
2778 || ! GOT_TLS_GDESC_P (*local_tls_type))
2779 srel->size += sizeof (Elf32_External_Rel);
2780 if (GOT_TLS_GDESC_P (*local_tls_type))
2781 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2782 }
2783 }
2784 else
2785 *local_got = (bfd_vma) -1;
2786 }
2787 }
2788
2789 if (htab->tls_ldm_got.refcount > 0)
2790 {
2791 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2792 relocs. */
2793 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2794 htab->elf.sgot->size += 8;
2795 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2796 }
2797 else
2798 htab->tls_ldm_got.offset = -1;
2799
2800 /* Allocate global sym .plt and .got entries, and space for global
2801 sym dynamic relocs. */
2802 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2803
2804 /* Allocate .plt and .got entries, and space for local symbols. */
2805 htab_traverse (htab->loc_hash_table,
2806 elf_i386_allocate_local_dynrelocs,
2807 info);
2808
2809 /* For every jump slot reserved in the sgotplt, reloc_count is
2810 incremented. However, when we reserve space for TLS descriptors,
2811 it's not incremented, so in order to compute the space reserved
2812 for them, it suffices to multiply the reloc count by the jump
2813 slot size.
2814
2815 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2816 so that R_386_IRELATIVE entries come last. */
2817 if (htab->elf.srelplt)
2818 {
2819 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2820 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2821 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2822 }
2823 else if (htab->elf.irelplt)
2824 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2825
2826
2827 if (htab->elf.sgotplt)
2828 {
2829 /* Don't allocate .got.plt section if there are no GOT nor PLT
2830 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2831 if ((htab->elf.hgot == NULL
2832 || !htab->elf.hgot->ref_regular_nonweak)
2833 && (htab->elf.sgotplt->size
2834 == get_elf_backend_data (output_bfd)->got_header_size)
2835 && (htab->elf.splt == NULL
2836 || htab->elf.splt->size == 0)
2837 && (htab->elf.sgot == NULL
2838 || htab->elf.sgot->size == 0)
2839 && (htab->elf.iplt == NULL
2840 || htab->elf.iplt->size == 0)
2841 && (htab->elf.igotplt == NULL
2842 || htab->elf.igotplt->size == 0))
2843 htab->elf.sgotplt->size = 0;
2844 }
2845
2846
2847 if (htab->plt_eh_frame != NULL
2848 && htab->elf.splt != NULL
2849 && htab->elf.splt->size != 0
2850 && !bfd_is_abs_section (htab->elf.splt->output_section)
2851 && _bfd_elf_eh_frame_present (info))
2852 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2853
2854 /* We now have determined the sizes of the various dynamic sections.
2855 Allocate memory for them. */
2856 relocs = FALSE;
2857 for (s = dynobj->sections; s != NULL; s = s->next)
2858 {
2859 bfd_boolean strip_section = TRUE;
2860
2861 if ((s->flags & SEC_LINKER_CREATED) == 0)
2862 continue;
2863
2864 if (s == htab->elf.splt
2865 || s == htab->elf.sgot)
2866 {
2867 /* Strip this section if we don't need it; see the
2868 comment below. */
2869 /* We'd like to strip these sections if they aren't needed, but if
2870 we've exported dynamic symbols from them we must leave them.
2871 It's too late to tell BFD to get rid of the symbols. */
2872
2873 if (htab->elf.hplt != NULL)
2874 strip_section = FALSE;
2875 }
2876 else if (s == htab->elf.sgotplt
2877 || s == htab->elf.iplt
2878 || s == htab->elf.igotplt
2879 || s == htab->plt_eh_frame
2880 || s == htab->sdynbss)
2881 {
2882 /* Strip these too. */
2883 }
2884 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2885 {
2886 if (s->size != 0
2887 && s != htab->elf.srelplt
2888 && s != htab->srelplt2)
2889 relocs = TRUE;
2890
2891 /* We use the reloc_count field as a counter if we need
2892 to copy relocs into the output file. */
2893 s->reloc_count = 0;
2894 }
2895 else
2896 {
2897 /* It's not one of our sections, so don't allocate space. */
2898 continue;
2899 }
2900
2901 if (s->size == 0)
2902 {
2903 /* If we don't need this section, strip it from the
2904 output file. This is mostly to handle .rel.bss and
2905 .rel.plt. We must create both sections in
2906 create_dynamic_sections, because they must be created
2907 before the linker maps input sections to output
2908 sections. The linker does that before
2909 adjust_dynamic_symbol is called, and it is that
2910 function which decides whether anything needs to go
2911 into these sections. */
2912 if (strip_section)
2913 s->flags |= SEC_EXCLUDE;
2914 continue;
2915 }
2916
2917 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2918 continue;
2919
2920 /* Allocate memory for the section contents. We use bfd_zalloc
2921 here in case unused entries are not reclaimed before the
2922 section's contents are written out. This should not happen,
2923 but this way if it does, we get a R_386_NONE reloc instead
2924 of garbage. */
2925 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2926 if (s->contents == NULL)
2927 return FALSE;
2928 }
2929
2930 if (htab->plt_eh_frame != NULL
2931 && htab->plt_eh_frame->contents != NULL)
2932 {
2933 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2934 sizeof (elf_i386_eh_frame_plt));
2935 bfd_put_32 (dynobj, htab->elf.splt->size,
2936 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2937 }
2938
2939 if (htab->elf.dynamic_sections_created)
2940 {
2941 /* Add some entries to the .dynamic section. We fill in the
2942 values later, in elf_i386_finish_dynamic_sections, but we
2943 must add the entries now so that we get the correct size for
2944 the .dynamic section. The DT_DEBUG entry is filled in by the
2945 dynamic linker and used by the debugger. */
2946 #define add_dynamic_entry(TAG, VAL) \
2947 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2948
2949 if (info->executable)
2950 {
2951 if (!add_dynamic_entry (DT_DEBUG, 0))
2952 return FALSE;
2953 }
2954
2955 if (htab->elf.splt->size != 0)
2956 {
2957 if (!add_dynamic_entry (DT_PLTGOT, 0)
2958 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2959 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2960 || !add_dynamic_entry (DT_JMPREL, 0))
2961 return FALSE;
2962 }
2963
2964 if (relocs)
2965 {
2966 if (!add_dynamic_entry (DT_REL, 0)
2967 || !add_dynamic_entry (DT_RELSZ, 0)
2968 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2969 return FALSE;
2970
2971 /* If any dynamic relocs apply to a read-only section,
2972 then we need a DT_TEXTREL entry. */
2973 if ((info->flags & DF_TEXTREL) == 0)
2974 elf_link_hash_traverse (&htab->elf,
2975 elf_i386_readonly_dynrelocs, info);
2976
2977 if ((info->flags & DF_TEXTREL) != 0)
2978 {
2979 if (!add_dynamic_entry (DT_TEXTREL, 0))
2980 return FALSE;
2981 }
2982 }
2983 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2984 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2985 return FALSE;
2986 }
2987 #undef add_dynamic_entry
2988
2989 return TRUE;
2990 }
2991
2992 static bfd_boolean
2993 elf_i386_always_size_sections (bfd *output_bfd,
2994 struct bfd_link_info *info)
2995 {
2996 asection *tls_sec = elf_hash_table (info)->tls_sec;
2997
2998 if (tls_sec)
2999 {
3000 struct elf_link_hash_entry *tlsbase;
3001
3002 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3003 "_TLS_MODULE_BASE_",
3004 FALSE, FALSE, FALSE);
3005
3006 if (tlsbase && tlsbase->type == STT_TLS)
3007 {
3008 struct elf_i386_link_hash_table *htab;
3009 struct bfd_link_hash_entry *bh = NULL;
3010 const struct elf_backend_data *bed
3011 = get_elf_backend_data (output_bfd);
3012
3013 htab = elf_i386_hash_table (info);
3014 if (htab == NULL)
3015 return FALSE;
3016
3017 if (!(_bfd_generic_link_add_one_symbol
3018 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3019 tls_sec, 0, NULL, FALSE,
3020 bed->collect, &bh)))
3021 return FALSE;
3022
3023 htab->tls_module_base = bh;
3024
3025 tlsbase = (struct elf_link_hash_entry *)bh;
3026 tlsbase->def_regular = 1;
3027 tlsbase->other = STV_HIDDEN;
3028 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3029 }
3030 }
3031
3032 return TRUE;
3033 }
3034
3035 /* Set the correct type for an x86 ELF section. We do this by the
3036 section name, which is a hack, but ought to work. */
3037
3038 static bfd_boolean
3039 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3040 Elf_Internal_Shdr *hdr,
3041 asection *sec)
3042 {
3043 const char *name;
3044
3045 name = bfd_get_section_name (abfd, sec);
3046
3047 /* This is an ugly, but unfortunately necessary hack that is
3048 needed when producing EFI binaries on x86. It tells
3049 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3050 containing ELF relocation info. We need this hack in order to
3051 be able to generate ELF binaries that can be translated into
3052 EFI applications (which are essentially COFF objects). Those
3053 files contain a COFF ".reloc" section inside an ELFNN object,
3054 which would normally cause BFD to segfault because it would
3055 attempt to interpret this section as containing relocation
3056 entries for section "oc". With this hack enabled, ".reloc"
3057 will be treated as a normal data section, which will avoid the
3058 segfault. However, you won't be able to create an ELFNN binary
3059 with a section named "oc" that needs relocations, but that's
3060 the kind of ugly side-effects you get when detecting section
3061 types based on their names... In practice, this limitation is
3062 unlikely to bite. */
3063 if (strcmp (name, ".reloc") == 0)
3064 hdr->sh_type = SHT_PROGBITS;
3065
3066 return TRUE;
3067 }
3068
3069 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3070 executables. Rather than setting it to the beginning of the TLS
3071 section, we have to set it to the end. This function may be called
3072 multiple times, it is idempotent. */
3073
3074 static void
3075 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3076 {
3077 struct elf_i386_link_hash_table *htab;
3078 struct bfd_link_hash_entry *base;
3079
3080 if (!info->executable)
3081 return;
3082
3083 htab = elf_i386_hash_table (info);
3084 if (htab == NULL)
3085 return;
3086
3087 base = htab->tls_module_base;
3088 if (base == NULL)
3089 return;
3090
3091 base->u.def.value = htab->elf.tls_size;
3092 }
3093
3094 /* Return the base VMA address which should be subtracted from real addresses
3095 when resolving @dtpoff relocation.
3096 This is PT_TLS segment p_vaddr. */
3097
3098 static bfd_vma
3099 elf_i386_dtpoff_base (struct bfd_link_info *info)
3100 {
3101 /* If tls_sec is NULL, we should have signalled an error already. */
3102 if (elf_hash_table (info)->tls_sec == NULL)
3103 return 0;
3104 return elf_hash_table (info)->tls_sec->vma;
3105 }
3106
3107 /* Return the relocation value for @tpoff relocation
3108 if STT_TLS virtual address is ADDRESS. */
3109
3110 static bfd_vma
3111 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3112 {
3113 struct elf_link_hash_table *htab = elf_hash_table (info);
3114 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3115 bfd_vma static_tls_size;
3116
3117 /* If tls_sec is NULL, we should have signalled an error already. */
3118 if (htab->tls_sec == NULL)
3119 return 0;
3120
3121 /* Consider special static TLS alignment requirements. */
3122 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3123 return static_tls_size + htab->tls_sec->vma - address;
3124 }
3125
3126 /* Relocate an i386 ELF section. */
3127
3128 static bfd_boolean
3129 elf_i386_relocate_section (bfd *output_bfd,
3130 struct bfd_link_info *info,
3131 bfd *input_bfd,
3132 asection *input_section,
3133 bfd_byte *contents,
3134 Elf_Internal_Rela *relocs,
3135 Elf_Internal_Sym *local_syms,
3136 asection **local_sections)
3137 {
3138 struct elf_i386_link_hash_table *htab;
3139 Elf_Internal_Shdr *symtab_hdr;
3140 struct elf_link_hash_entry **sym_hashes;
3141 bfd_vma *local_got_offsets;
3142 bfd_vma *local_tlsdesc_gotents;
3143 Elf_Internal_Rela *rel;
3144 Elf_Internal_Rela *relend;
3145 bfd_boolean is_vxworks_tls;
3146 unsigned plt_entry_size;
3147
3148 BFD_ASSERT (is_i386_elf (input_bfd));
3149
3150 htab = elf_i386_hash_table (info);
3151 if (htab == NULL)
3152 return FALSE;
3153 symtab_hdr = &elf_symtab_hdr (input_bfd);
3154 sym_hashes = elf_sym_hashes (input_bfd);
3155 local_got_offsets = elf_local_got_offsets (input_bfd);
3156 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3157 /* We have to handle relocations in vxworks .tls_vars sections
3158 specially, because the dynamic loader is 'weird'. */
3159 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3160 && info->shared
3161 && !strcmp (input_section->output_section->name,
3162 ".tls_vars"));
3163
3164 elf_i386_set_tls_module_base (info);
3165
3166 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3167
3168 rel = relocs;
3169 relend = relocs + input_section->reloc_count;
3170 for (; rel < relend; rel++)
3171 {
3172 unsigned int r_type;
3173 reloc_howto_type *howto;
3174 unsigned long r_symndx;
3175 struct elf_link_hash_entry *h;
3176 Elf_Internal_Sym *sym;
3177 asection *sec;
3178 bfd_vma off, offplt;
3179 bfd_vma relocation;
3180 bfd_boolean unresolved_reloc;
3181 bfd_reloc_status_type r;
3182 unsigned int indx;
3183 int tls_type;
3184
3185 r_type = ELF32_R_TYPE (rel->r_info);
3186 if (r_type == R_386_GNU_VTINHERIT
3187 || r_type == R_386_GNU_VTENTRY)
3188 continue;
3189
3190 if ((indx = r_type) >= R_386_standard
3191 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3192 >= R_386_ext - R_386_standard)
3193 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3194 >= R_386_irelative - R_386_ext))
3195 {
3196 (*_bfd_error_handler)
3197 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3198 input_bfd, input_section, r_type);
3199 bfd_set_error (bfd_error_bad_value);
3200 return FALSE;
3201 }
3202 howto = elf_howto_table + indx;
3203
3204 r_symndx = ELF32_R_SYM (rel->r_info);
3205 h = NULL;
3206 sym = NULL;
3207 sec = NULL;
3208 unresolved_reloc = FALSE;
3209 if (r_symndx < symtab_hdr->sh_info)
3210 {
3211 sym = local_syms + r_symndx;
3212 sec = local_sections[r_symndx];
3213 relocation = (sec->output_section->vma
3214 + sec->output_offset
3215 + sym->st_value);
3216
3217 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3218 && ((sec->flags & SEC_MERGE) != 0
3219 || (info->relocatable
3220 && sec->output_offset != 0)))
3221 {
3222 bfd_vma addend;
3223 bfd_byte *where = contents + rel->r_offset;
3224
3225 switch (howto->size)
3226 {
3227 case 0:
3228 addend = bfd_get_8 (input_bfd, where);
3229 if (howto->pc_relative)
3230 {
3231 addend = (addend ^ 0x80) - 0x80;
3232 addend += 1;
3233 }
3234 break;
3235 case 1:
3236 addend = bfd_get_16 (input_bfd, where);
3237 if (howto->pc_relative)
3238 {
3239 addend = (addend ^ 0x8000) - 0x8000;
3240 addend += 2;
3241 }
3242 break;
3243 case 2:
3244 addend = bfd_get_32 (input_bfd, where);
3245 if (howto->pc_relative)
3246 {
3247 addend = (addend ^ 0x80000000) - 0x80000000;
3248 addend += 4;
3249 }
3250 break;
3251 default:
3252 abort ();
3253 }
3254
3255 if (info->relocatable)
3256 addend += sec->output_offset;
3257 else
3258 {
3259 asection *msec = sec;
3260 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3261 addend);
3262 addend -= relocation;
3263 addend += msec->output_section->vma + msec->output_offset;
3264 }
3265
3266 switch (howto->size)
3267 {
3268 case 0:
3269 /* FIXME: overflow checks. */
3270 if (howto->pc_relative)
3271 addend -= 1;
3272 bfd_put_8 (input_bfd, addend, where);
3273 break;
3274 case 1:
3275 if (howto->pc_relative)
3276 addend -= 2;
3277 bfd_put_16 (input_bfd, addend, where);
3278 break;
3279 case 2:
3280 if (howto->pc_relative)
3281 addend -= 4;
3282 bfd_put_32 (input_bfd, addend, where);
3283 break;
3284 }
3285 }
3286 else if (!info->relocatable
3287 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3288 {
3289 /* Relocate against local STT_GNU_IFUNC symbol. */
3290 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3291 FALSE);
3292 if (h == NULL)
3293 abort ();
3294
3295 /* Set STT_GNU_IFUNC symbol value. */
3296 h->root.u.def.value = sym->st_value;
3297 h->root.u.def.section = sec;
3298 }
3299 }
3300 else
3301 {
3302 bfd_boolean warned ATTRIBUTE_UNUSED;
3303
3304 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3305 r_symndx, symtab_hdr, sym_hashes,
3306 h, sec, relocation,
3307 unresolved_reloc, warned);
3308 }
3309
3310 if (sec != NULL && discarded_section (sec))
3311 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3312 rel, 1, relend, howto, 0, contents);
3313
3314 if (info->relocatable)
3315 continue;
3316
3317 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3318 it here if it is defined in a non-shared object. */
3319 if (h != NULL
3320 && h->type == STT_GNU_IFUNC
3321 && h->def_regular)
3322 {
3323 asection *plt, *gotplt, *base_got;
3324 bfd_vma plt_index;
3325 const char *name;
3326
3327 if ((input_section->flags & SEC_ALLOC) == 0
3328 || h->plt.offset == (bfd_vma) -1)
3329 abort ();
3330
3331 /* STT_GNU_IFUNC symbol must go through PLT. */
3332 if (htab->elf.splt != NULL)
3333 {
3334 plt = htab->elf.splt;
3335 gotplt = htab->elf.sgotplt;
3336 }
3337 else
3338 {
3339 plt = htab->elf.iplt;
3340 gotplt = htab->elf.igotplt;
3341 }
3342
3343 relocation = (plt->output_section->vma
3344 + plt->output_offset + h->plt.offset);
3345
3346 switch (r_type)
3347 {
3348 default:
3349 if (h->root.root.string)
3350 name = h->root.root.string;
3351 else
3352 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3353 NULL);
3354 (*_bfd_error_handler)
3355 (_("%B: relocation %s against STT_GNU_IFUNC "
3356 "symbol `%s' isn't handled by %s"), input_bfd,
3357 elf_howto_table[r_type].name,
3358 name, __FUNCTION__);
3359 bfd_set_error (bfd_error_bad_value);
3360 return FALSE;
3361
3362 case R_386_32:
3363 /* Generate dynamic relcoation only when there is a
3364 non-GOT reference in a shared object. */
3365 if (info->shared && h->non_got_ref)
3366 {
3367 Elf_Internal_Rela outrel;
3368 bfd_byte *loc;
3369 asection *sreloc;
3370 bfd_vma offset;
3371
3372 /* Need a dynamic relocation to get the real function
3373 adddress. */
3374 offset = _bfd_elf_section_offset (output_bfd,
3375 info,
3376 input_section,
3377 rel->r_offset);
3378 if (offset == (bfd_vma) -1
3379 || offset == (bfd_vma) -2)
3380 abort ();
3381
3382 outrel.r_offset = (input_section->output_section->vma
3383 + input_section->output_offset
3384 + offset);
3385
3386 if (h->dynindx == -1
3387 || h->forced_local
3388 || info->executable)
3389 {
3390 /* This symbol is resolved locally. */
3391 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3392 bfd_put_32 (output_bfd,
3393 (h->root.u.def.value
3394 + h->root.u.def.section->output_section->vma
3395 + h->root.u.def.section->output_offset),
3396 contents + offset);
3397 }
3398 else
3399 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3400
3401 sreloc = htab->elf.irelifunc;
3402 loc = sreloc->contents;
3403 loc += (sreloc->reloc_count++
3404 * sizeof (Elf32_External_Rel));
3405 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3406
3407 /* If this reloc is against an external symbol, we
3408 do not want to fiddle with the addend. Otherwise,
3409 we need to include the symbol value so that it
3410 becomes an addend for the dynamic reloc. For an
3411 internal symbol, we have updated addend. */
3412 continue;
3413 }
3414 /* FALLTHROUGH */
3415 case R_386_PC32:
3416 case R_386_PLT32:
3417 goto do_relocation;
3418
3419 case R_386_GOT32:
3420 base_got = htab->elf.sgot;
3421 off = h->got.offset;
3422
3423 if (base_got == NULL)
3424 abort ();
3425
3426 if (off == (bfd_vma) -1)
3427 {
3428 /* We can't use h->got.offset here to save state, or
3429 even just remember the offset, as finish_dynamic_symbol
3430 would use that as offset into .got. */
3431
3432 if (htab->elf.splt != NULL)
3433 {
3434 plt_index = h->plt.offset / plt_entry_size - 1;
3435 off = (plt_index + 3) * 4;
3436 base_got = htab->elf.sgotplt;
3437 }
3438 else
3439 {
3440 plt_index = h->plt.offset / plt_entry_size;
3441 off = plt_index * 4;
3442 base_got = htab->elf.igotplt;
3443 }
3444
3445 if (h->dynindx == -1
3446 || h->forced_local
3447 || info->symbolic)
3448 {
3449 /* This references the local defitionion. We must
3450 initialize this entry in the global offset table.
3451 Since the offset must always be a multiple of 8,
3452 we use the least significant bit to record
3453 whether we have initialized it already.
3454
3455 When doing a dynamic link, we create a .rela.got
3456 relocation entry to initialize the value. This
3457 is done in the finish_dynamic_symbol routine. */
3458 if ((off & 1) != 0)
3459 off &= ~1;
3460 else
3461 {
3462 bfd_put_32 (output_bfd, relocation,
3463 base_got->contents + off);
3464 h->got.offset |= 1;
3465 }
3466 }
3467
3468 relocation = off;
3469
3470 /* Adjust for static executables. */
3471 if (htab->elf.splt == NULL)
3472 relocation += gotplt->output_offset;
3473 }
3474 else
3475 {
3476 relocation = (base_got->output_section->vma
3477 + base_got->output_offset + off
3478 - gotplt->output_section->vma
3479 - gotplt->output_offset);
3480 /* Adjust for static executables. */
3481 if (htab->elf.splt == NULL)
3482 relocation += gotplt->output_offset;
3483 }
3484
3485 goto do_relocation;
3486
3487 case R_386_GOTOFF:
3488 relocation -= (gotplt->output_section->vma
3489 + gotplt->output_offset);
3490 goto do_relocation;
3491 }
3492 }
3493
3494 switch (r_type)
3495 {
3496 case R_386_GOT32:
3497 /* Relocation is to the entry for this symbol in the global
3498 offset table. */
3499 if (htab->elf.sgot == NULL)
3500 abort ();
3501
3502 if (h != NULL)
3503 {
3504 bfd_boolean dyn;
3505
3506 off = h->got.offset;
3507 dyn = htab->elf.dynamic_sections_created;
3508 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3509 || (info->shared
3510 && SYMBOL_REFERENCES_LOCAL (info, h))
3511 || (ELF_ST_VISIBILITY (h->other)
3512 && h->root.type == bfd_link_hash_undefweak))
3513 {
3514 /* This is actually a static link, or it is a
3515 -Bsymbolic link and the symbol is defined
3516 locally, or the symbol was forced to be local
3517 because of a version file. We must initialize
3518 this entry in the global offset table. Since the
3519 offset must always be a multiple of 4, we use the
3520 least significant bit to record whether we have
3521 initialized it already.
3522
3523 When doing a dynamic link, we create a .rel.got
3524 relocation entry to initialize the value. This
3525 is done in the finish_dynamic_symbol routine. */
3526 if ((off & 1) != 0)
3527 off &= ~1;
3528 else
3529 {
3530 bfd_put_32 (output_bfd, relocation,
3531 htab->elf.sgot->contents + off);
3532 h->got.offset |= 1;
3533 }
3534 }
3535 else
3536 unresolved_reloc = FALSE;
3537 }
3538 else
3539 {
3540 if (local_got_offsets == NULL)
3541 abort ();
3542
3543 off = local_got_offsets[r_symndx];
3544
3545 /* The offset must always be a multiple of 4. We use
3546 the least significant bit to record whether we have
3547 already generated the necessary reloc. */
3548 if ((off & 1) != 0)
3549 off &= ~1;
3550 else
3551 {
3552 bfd_put_32 (output_bfd, relocation,
3553 htab->elf.sgot->contents + off);
3554
3555 if (info->shared)
3556 {
3557 asection *s;
3558 Elf_Internal_Rela outrel;
3559 bfd_byte *loc;
3560
3561 s = htab->elf.srelgot;
3562 if (s == NULL)
3563 abort ();
3564
3565 outrel.r_offset = (htab->elf.sgot->output_section->vma
3566 + htab->elf.sgot->output_offset
3567 + off);
3568 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3569 loc = s->contents;
3570 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3571 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3572 }
3573
3574 local_got_offsets[r_symndx] |= 1;
3575 }
3576 }
3577
3578 if (off >= (bfd_vma) -2)
3579 abort ();
3580
3581 relocation = htab->elf.sgot->output_section->vma
3582 + htab->elf.sgot->output_offset + off
3583 - htab->elf.sgotplt->output_section->vma
3584 - htab->elf.sgotplt->output_offset;
3585 break;
3586
3587 case R_386_GOTOFF:
3588 /* Relocation is relative to the start of the global offset
3589 table. */
3590
3591 /* Check to make sure it isn't a protected function symbol
3592 for shared library since it may not be local when used
3593 as function address. We also need to make sure that a
3594 symbol is defined locally. */
3595 if (info->shared && h)
3596 {
3597 if (!h->def_regular)
3598 {
3599 const char *v;
3600
3601 switch (ELF_ST_VISIBILITY (h->other))
3602 {
3603 case STV_HIDDEN:
3604 v = _("hidden symbol");
3605 break;
3606 case STV_INTERNAL:
3607 v = _("internal symbol");
3608 break;
3609 case STV_PROTECTED:
3610 v = _("protected symbol");
3611 break;
3612 default:
3613 v = _("symbol");
3614 break;
3615 }
3616
3617 (*_bfd_error_handler)
3618 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3619 input_bfd, v, h->root.root.string);
3620 bfd_set_error (bfd_error_bad_value);
3621 return FALSE;
3622 }
3623 else if (!info->executable
3624 && !SYMBOLIC_BIND (info, h)
3625 && h->type == STT_FUNC
3626 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3627 {
3628 (*_bfd_error_handler)
3629 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3630 input_bfd, h->root.root.string);
3631 bfd_set_error (bfd_error_bad_value);
3632 return FALSE;
3633 }
3634 }
3635
3636 /* Note that sgot is not involved in this
3637 calculation. We always want the start of .got.plt. If we
3638 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3639 permitted by the ABI, we might have to change this
3640 calculation. */
3641 relocation -= htab->elf.sgotplt->output_section->vma
3642 + htab->elf.sgotplt->output_offset;
3643 break;
3644
3645 case R_386_GOTPC:
3646 /* Use global offset table as symbol value. */
3647 relocation = htab->elf.sgotplt->output_section->vma
3648 + htab->elf.sgotplt->output_offset;
3649 unresolved_reloc = FALSE;
3650 break;
3651
3652 case R_386_PLT32:
3653 /* Relocation is to the entry for this symbol in the
3654 procedure linkage table. */
3655
3656 /* Resolve a PLT32 reloc against a local symbol directly,
3657 without using the procedure linkage table. */
3658 if (h == NULL)
3659 break;
3660
3661 if (h->plt.offset == (bfd_vma) -1
3662 || htab->elf.splt == NULL)
3663 {
3664 /* We didn't make a PLT entry for this symbol. This
3665 happens when statically linking PIC code, or when
3666 using -Bsymbolic. */
3667 break;
3668 }
3669
3670 relocation = (htab->elf.splt->output_section->vma
3671 + htab->elf.splt->output_offset
3672 + h->plt.offset);
3673 unresolved_reloc = FALSE;
3674 break;
3675
3676 case R_386_32:
3677 case R_386_PC32:
3678 if ((input_section->flags & SEC_ALLOC) == 0
3679 || is_vxworks_tls)
3680 break;
3681
3682 if ((info->shared
3683 && (h == NULL
3684 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3685 || h->root.type != bfd_link_hash_undefweak)
3686 && (r_type != R_386_PC32
3687 || !SYMBOL_CALLS_LOCAL (info, h)))
3688 || (ELIMINATE_COPY_RELOCS
3689 && !info->shared
3690 && h != NULL
3691 && h->dynindx != -1
3692 && !h->non_got_ref
3693 && ((h->def_dynamic
3694 && !h->def_regular)
3695 || h->root.type == bfd_link_hash_undefweak
3696 || h->root.type == bfd_link_hash_undefined)))
3697 {
3698 Elf_Internal_Rela outrel;
3699 bfd_byte *loc;
3700 bfd_boolean skip, relocate;
3701 asection *sreloc;
3702
3703 /* When generating a shared object, these relocations
3704 are copied into the output file to be resolved at run
3705 time. */
3706
3707 skip = FALSE;
3708 relocate = FALSE;
3709
3710 outrel.r_offset =
3711 _bfd_elf_section_offset (output_bfd, info, input_section,
3712 rel->r_offset);
3713 if (outrel.r_offset == (bfd_vma) -1)
3714 skip = TRUE;
3715 else if (outrel.r_offset == (bfd_vma) -2)
3716 skip = TRUE, relocate = TRUE;
3717 outrel.r_offset += (input_section->output_section->vma
3718 + input_section->output_offset);
3719
3720 if (skip)
3721 memset (&outrel, 0, sizeof outrel);
3722 else if (h != NULL
3723 && h->dynindx != -1
3724 && (r_type == R_386_PC32
3725 || !info->shared
3726 || !SYMBOLIC_BIND (info, h)
3727 || !h->def_regular))
3728 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3729 else
3730 {
3731 /* This symbol is local, or marked to become local. */
3732 relocate = TRUE;
3733 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3734 }
3735
3736 sreloc = elf_section_data (input_section)->sreloc;
3737
3738 if (sreloc == NULL || sreloc->contents == NULL)
3739 {
3740 r = bfd_reloc_notsupported;
3741 goto check_relocation_error;
3742 }
3743
3744 loc = sreloc->contents;
3745 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3746
3747 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3748
3749 /* If this reloc is against an external symbol, we do
3750 not want to fiddle with the addend. Otherwise, we
3751 need to include the symbol value so that it becomes
3752 an addend for the dynamic reloc. */
3753 if (! relocate)
3754 continue;
3755 }
3756 break;
3757
3758 case R_386_TLS_IE:
3759 if (!info->executable)
3760 {
3761 Elf_Internal_Rela outrel;
3762 bfd_byte *loc;
3763 asection *sreloc;
3764
3765 outrel.r_offset = rel->r_offset
3766 + input_section->output_section->vma
3767 + input_section->output_offset;
3768 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3769 sreloc = elf_section_data (input_section)->sreloc;
3770 if (sreloc == NULL)
3771 abort ();
3772 loc = sreloc->contents;
3773 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3774 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3775 }
3776 /* Fall through */
3777
3778 case R_386_TLS_GD:
3779 case R_386_TLS_GOTDESC:
3780 case R_386_TLS_DESC_CALL:
3781 case R_386_TLS_IE_32:
3782 case R_386_TLS_GOTIE:
3783 tls_type = GOT_UNKNOWN;
3784 if (h == NULL && local_got_offsets)
3785 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3786 else if (h != NULL)
3787 tls_type = elf_i386_hash_entry(h)->tls_type;
3788 if (tls_type == GOT_TLS_IE)
3789 tls_type = GOT_TLS_IE_NEG;
3790
3791 if (! elf_i386_tls_transition (info, input_bfd,
3792 input_section, contents,
3793 symtab_hdr, sym_hashes,
3794 &r_type, tls_type, rel,
3795 relend, h, r_symndx))
3796 return FALSE;
3797
3798 if (r_type == R_386_TLS_LE_32)
3799 {
3800 BFD_ASSERT (! unresolved_reloc);
3801 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3802 {
3803 unsigned int type;
3804 bfd_vma roff;
3805
3806 /* GD->LE transition. */
3807 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3808 if (type == 0x04)
3809 {
3810 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3811 Change it into:
3812 movl %gs:0, %eax; subl $foo@tpoff, %eax
3813 (6 byte form of subl). */
3814 memcpy (contents + rel->r_offset - 3,
3815 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3816 roff = rel->r_offset + 5;
3817 }
3818 else
3819 {
3820 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3821 Change it into:
3822 movl %gs:0, %eax; subl $foo@tpoff, %eax
3823 (6 byte form of subl). */
3824 memcpy (contents + rel->r_offset - 2,
3825 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3826 roff = rel->r_offset + 6;
3827 }
3828 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3829 contents + roff);
3830 /* Skip R_386_PC32/R_386_PLT32. */
3831 rel++;
3832 continue;
3833 }
3834 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3835 {
3836 /* GDesc -> LE transition.
3837 It's originally something like:
3838 leal x@tlsdesc(%ebx), %eax
3839
3840 leal x@ntpoff, %eax
3841
3842 Registers other than %eax may be set up here. */
3843
3844 unsigned int val;
3845 bfd_vma roff;
3846
3847 roff = rel->r_offset;
3848 val = bfd_get_8 (input_bfd, contents + roff - 1);
3849
3850 /* Now modify the instruction as appropriate. */
3851 /* aoliva FIXME: remove the above and xor the byte
3852 below with 0x86. */
3853 bfd_put_8 (output_bfd, val ^ 0x86,
3854 contents + roff - 1);
3855 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3856 contents + roff);
3857 continue;
3858 }
3859 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3860 {
3861 /* GDesc -> LE transition.
3862 It's originally:
3863 call *(%eax)
3864 Turn it into:
3865 xchg %ax,%ax */
3866
3867 bfd_vma roff;
3868
3869 roff = rel->r_offset;
3870 bfd_put_8 (output_bfd, 0x66, contents + roff);
3871 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3872 continue;
3873 }
3874 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3875 {
3876 unsigned int val;
3877
3878 /* IE->LE transition:
3879 Originally it can be one of:
3880 movl foo, %eax
3881 movl foo, %reg
3882 addl foo, %reg
3883 We change it into:
3884 movl $foo, %eax
3885 movl $foo, %reg
3886 addl $foo, %reg. */
3887 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3888 if (val == 0xa1)
3889 {
3890 /* movl foo, %eax. */
3891 bfd_put_8 (output_bfd, 0xb8,
3892 contents + rel->r_offset - 1);
3893 }
3894 else
3895 {
3896 unsigned int type;
3897
3898 type = bfd_get_8 (input_bfd,
3899 contents + rel->r_offset - 2);
3900 switch (type)
3901 {
3902 case 0x8b:
3903 /* movl */
3904 bfd_put_8 (output_bfd, 0xc7,
3905 contents + rel->r_offset - 2);
3906 bfd_put_8 (output_bfd,
3907 0xc0 | ((val >> 3) & 7),
3908 contents + rel->r_offset - 1);
3909 break;
3910 case 0x03:
3911 /* addl */
3912 bfd_put_8 (output_bfd, 0x81,
3913 contents + rel->r_offset - 2);
3914 bfd_put_8 (output_bfd,
3915 0xc0 | ((val >> 3) & 7),
3916 contents + rel->r_offset - 1);
3917 break;
3918 default:
3919 BFD_FAIL ();
3920 break;
3921 }
3922 }
3923 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3924 contents + rel->r_offset);
3925 continue;
3926 }
3927 else
3928 {
3929 unsigned int val, type;
3930
3931 /* {IE_32,GOTIE}->LE transition:
3932 Originally it can be one of:
3933 subl foo(%reg1), %reg2
3934 movl foo(%reg1), %reg2
3935 addl foo(%reg1), %reg2
3936 We change it into:
3937 subl $foo, %reg2
3938 movl $foo, %reg2 (6 byte form)
3939 addl $foo, %reg2. */
3940 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3941 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3942 if (type == 0x8b)
3943 {
3944 /* movl */
3945 bfd_put_8 (output_bfd, 0xc7,
3946 contents + rel->r_offset - 2);
3947 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3948 contents + rel->r_offset - 1);
3949 }
3950 else if (type == 0x2b)
3951 {
3952 /* subl */
3953 bfd_put_8 (output_bfd, 0x81,
3954 contents + rel->r_offset - 2);
3955 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3956 contents + rel->r_offset - 1);
3957 }
3958 else if (type == 0x03)
3959 {
3960 /* addl */
3961 bfd_put_8 (output_bfd, 0x81,
3962 contents + rel->r_offset - 2);
3963 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3964 contents + rel->r_offset - 1);
3965 }
3966 else
3967 BFD_FAIL ();
3968 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3969 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3970 contents + rel->r_offset);
3971 else
3972 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3973 contents + rel->r_offset);
3974 continue;
3975 }
3976 }
3977
3978 if (htab->elf.sgot == NULL)
3979 abort ();
3980
3981 if (h != NULL)
3982 {
3983 off = h->got.offset;
3984 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3985 }
3986 else
3987 {
3988 if (local_got_offsets == NULL)
3989 abort ();
3990
3991 off = local_got_offsets[r_symndx];
3992 offplt = local_tlsdesc_gotents[r_symndx];
3993 }
3994
3995 if ((off & 1) != 0)
3996 off &= ~1;
3997 else
3998 {
3999 Elf_Internal_Rela outrel;
4000 bfd_byte *loc;
4001 int dr_type;
4002 asection *sreloc;
4003
4004 if (htab->elf.srelgot == NULL)
4005 abort ();
4006
4007 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4008
4009 if (GOT_TLS_GDESC_P (tls_type))
4010 {
4011 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4012 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4013 <= htab->elf.sgotplt->size);
4014 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4015 + htab->elf.sgotplt->output_offset
4016 + offplt
4017 + htab->sgotplt_jump_table_size);
4018 sreloc = htab->elf.srelplt;
4019 loc = sreloc->contents;
4020 loc += (htab->next_tls_desc_index++
4021 * sizeof (Elf32_External_Rel));
4022 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4023 <= sreloc->contents + sreloc->size);
4024 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4025 if (indx == 0)
4026 {
4027 BFD_ASSERT (! unresolved_reloc);
4028 bfd_put_32 (output_bfd,
4029 relocation - elf_i386_dtpoff_base (info),
4030 htab->elf.sgotplt->contents + offplt
4031 + htab->sgotplt_jump_table_size + 4);
4032 }
4033 else
4034 {
4035 bfd_put_32 (output_bfd, 0,
4036 htab->elf.sgotplt->contents + offplt
4037 + htab->sgotplt_jump_table_size + 4);
4038 }
4039 }
4040
4041 sreloc = htab->elf.srelgot;
4042
4043 outrel.r_offset = (htab->elf.sgot->output_section->vma
4044 + htab->elf.sgot->output_offset + off);
4045
4046 if (GOT_TLS_GD_P (tls_type))
4047 dr_type = R_386_TLS_DTPMOD32;
4048 else if (GOT_TLS_GDESC_P (tls_type))
4049 goto dr_done;
4050 else if (tls_type == GOT_TLS_IE_POS)
4051 dr_type = R_386_TLS_TPOFF;
4052 else
4053 dr_type = R_386_TLS_TPOFF32;
4054
4055 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4056 bfd_put_32 (output_bfd,
4057 relocation - elf_i386_dtpoff_base (info),
4058 htab->elf.sgot->contents + off);
4059 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4060 bfd_put_32 (output_bfd,
4061 elf_i386_dtpoff_base (info) - relocation,
4062 htab->elf.sgot->contents + off);
4063 else if (dr_type != R_386_TLS_DESC)
4064 bfd_put_32 (output_bfd, 0,
4065 htab->elf.sgot->contents + off);
4066 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4067
4068 loc = sreloc->contents;
4069 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4070 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4071 <= sreloc->contents + sreloc->size);
4072 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4073
4074 if (GOT_TLS_GD_P (tls_type))
4075 {
4076 if (indx == 0)
4077 {
4078 BFD_ASSERT (! unresolved_reloc);
4079 bfd_put_32 (output_bfd,
4080 relocation - elf_i386_dtpoff_base (info),
4081 htab->elf.sgot->contents + off + 4);
4082 }
4083 else
4084 {
4085 bfd_put_32 (output_bfd, 0,
4086 htab->elf.sgot->contents + off + 4);
4087 outrel.r_info = ELF32_R_INFO (indx,
4088 R_386_TLS_DTPOFF32);
4089 outrel.r_offset += 4;
4090 sreloc->reloc_count++;
4091 loc += sizeof (Elf32_External_Rel);
4092 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4093 <= sreloc->contents + sreloc->size);
4094 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4095 }
4096 }
4097 else if (tls_type == GOT_TLS_IE_BOTH)
4098 {
4099 bfd_put_32 (output_bfd,
4100 (indx == 0
4101 ? relocation - elf_i386_dtpoff_base (info)
4102 : 0),
4103 htab->elf.sgot->contents + off + 4);
4104 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4105 outrel.r_offset += 4;
4106 sreloc->reloc_count++;
4107 loc += sizeof (Elf32_External_Rel);
4108 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4109 }
4110
4111 dr_done:
4112 if (h != NULL)
4113 h->got.offset |= 1;
4114 else
4115 local_got_offsets[r_symndx] |= 1;
4116 }
4117
4118 if (off >= (bfd_vma) -2
4119 && ! GOT_TLS_GDESC_P (tls_type))
4120 abort ();
4121 if (r_type == R_386_TLS_GOTDESC
4122 || r_type == R_386_TLS_DESC_CALL)
4123 {
4124 relocation = htab->sgotplt_jump_table_size + offplt;
4125 unresolved_reloc = FALSE;
4126 }
4127 else if (r_type == ELF32_R_TYPE (rel->r_info))
4128 {
4129 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4130 + htab->elf.sgotplt->output_offset;
4131 relocation = htab->elf.sgot->output_section->vma
4132 + htab->elf.sgot->output_offset + off - g_o_t;
4133 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4134 && tls_type == GOT_TLS_IE_BOTH)
4135 relocation += 4;
4136 if (r_type == R_386_TLS_IE)
4137 relocation += g_o_t;
4138 unresolved_reloc = FALSE;
4139 }
4140 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4141 {
4142 unsigned int val, type;
4143 bfd_vma roff;
4144
4145 /* GD->IE transition. */
4146 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4147 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4148 if (type == 0x04)
4149 {
4150 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4151 Change it into:
4152 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4153 val >>= 3;
4154 roff = rel->r_offset - 3;
4155 }
4156 else
4157 {
4158 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4159 Change it into:
4160 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4161 roff = rel->r_offset - 2;
4162 }
4163 memcpy (contents + roff,
4164 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4165 contents[roff + 7] = 0x80 | (val & 7);
4166 /* If foo is used only with foo@gotntpoff(%reg) and
4167 foo@indntpoff, but not with foo@gottpoff(%reg), change
4168 subl $foo@gottpoff(%reg), %eax
4169 into:
4170 addl $foo@gotntpoff(%reg), %eax. */
4171 if (tls_type == GOT_TLS_IE_POS)
4172 contents[roff + 6] = 0x03;
4173 bfd_put_32 (output_bfd,
4174 htab->elf.sgot->output_section->vma
4175 + htab->elf.sgot->output_offset + off
4176 - htab->elf.sgotplt->output_section->vma
4177 - htab->elf.sgotplt->output_offset,
4178 contents + roff + 8);
4179 /* Skip R_386_PLT32. */
4180 rel++;
4181 continue;
4182 }
4183 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4184 {
4185 /* GDesc -> IE transition.
4186 It's originally something like:
4187 leal x@tlsdesc(%ebx), %eax
4188
4189 Change it to:
4190 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4191 or:
4192 movl x@gottpoff(%ebx), %eax # before negl %eax
4193
4194 Registers other than %eax may be set up here. */
4195
4196 bfd_vma roff;
4197
4198 /* First, make sure it's a leal adding ebx to a 32-bit
4199 offset into any register, although it's probably
4200 almost always going to be eax. */
4201 roff = rel->r_offset;
4202
4203 /* Now modify the instruction as appropriate. */
4204 /* To turn a leal into a movl in the form we use it, it
4205 suffices to change the first byte from 0x8d to 0x8b.
4206 aoliva FIXME: should we decide to keep the leal, all
4207 we have to do is remove the statement below, and
4208 adjust the relaxation of R_386_TLS_DESC_CALL. */
4209 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4210
4211 if (tls_type == GOT_TLS_IE_BOTH)
4212 off += 4;
4213
4214 bfd_put_32 (output_bfd,
4215 htab->elf.sgot->output_section->vma
4216 + htab->elf.sgot->output_offset + off
4217 - htab->elf.sgotplt->output_section->vma
4218 - htab->elf.sgotplt->output_offset,
4219 contents + roff);
4220 continue;
4221 }
4222 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4223 {
4224 /* GDesc -> IE transition.
4225 It's originally:
4226 call *(%eax)
4227
4228 Change it to:
4229 xchg %ax,%ax
4230 or
4231 negl %eax
4232 depending on how we transformed the TLS_GOTDESC above.
4233 */
4234
4235 bfd_vma roff;
4236
4237 roff = rel->r_offset;
4238
4239 /* Now modify the instruction as appropriate. */
4240 if (tls_type != GOT_TLS_IE_NEG)
4241 {
4242 /* xchg %ax,%ax */
4243 bfd_put_8 (output_bfd, 0x66, contents + roff);
4244 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4245 }
4246 else
4247 {
4248 /* negl %eax */
4249 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4250 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4251 }
4252
4253 continue;
4254 }
4255 else
4256 BFD_ASSERT (FALSE);
4257 break;
4258
4259 case R_386_TLS_LDM:
4260 if (! elf_i386_tls_transition (info, input_bfd,
4261 input_section, contents,
4262 symtab_hdr, sym_hashes,
4263 &r_type, GOT_UNKNOWN, rel,
4264 relend, h, r_symndx))
4265 return FALSE;
4266
4267 if (r_type != R_386_TLS_LDM)
4268 {
4269 /* LD->LE transition:
4270 leal foo(%reg), %eax; call ___tls_get_addr.
4271 We change it into:
4272 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4273 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4274 memcpy (contents + rel->r_offset - 2,
4275 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4276 /* Skip R_386_PC32/R_386_PLT32. */
4277 rel++;
4278 continue;
4279 }
4280
4281 if (htab->elf.sgot == NULL)
4282 abort ();
4283
4284 off = htab->tls_ldm_got.offset;
4285 if (off & 1)
4286 off &= ~1;
4287 else
4288 {
4289 Elf_Internal_Rela outrel;
4290 bfd_byte *loc;
4291
4292 if (htab->elf.srelgot == NULL)
4293 abort ();
4294
4295 outrel.r_offset = (htab->elf.sgot->output_section->vma
4296 + htab->elf.sgot->output_offset + off);
4297
4298 bfd_put_32 (output_bfd, 0,
4299 htab->elf.sgot->contents + off);
4300 bfd_put_32 (output_bfd, 0,
4301 htab->elf.sgot->contents + off + 4);
4302 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4303 loc = htab->elf.srelgot->contents;
4304 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4305 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4306 htab->tls_ldm_got.offset |= 1;
4307 }
4308 relocation = htab->elf.sgot->output_section->vma
4309 + htab->elf.sgot->output_offset + off
4310 - htab->elf.sgotplt->output_section->vma
4311 - htab->elf.sgotplt->output_offset;
4312 unresolved_reloc = FALSE;
4313 break;
4314
4315 case R_386_TLS_LDO_32:
4316 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4317 relocation -= elf_i386_dtpoff_base (info);
4318 else
4319 /* When converting LDO to LE, we must negate. */
4320 relocation = -elf_i386_tpoff (info, relocation);
4321 break;
4322
4323 case R_386_TLS_LE_32:
4324 case R_386_TLS_LE:
4325 if (!info->executable)
4326 {
4327 Elf_Internal_Rela outrel;
4328 asection *sreloc;
4329 bfd_byte *loc;
4330
4331 outrel.r_offset = rel->r_offset
4332 + input_section->output_section->vma
4333 + input_section->output_offset;
4334 if (h != NULL && h->dynindx != -1)
4335 indx = h->dynindx;
4336 else
4337 indx = 0;
4338 if (r_type == R_386_TLS_LE_32)
4339 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4340 else
4341 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4342 sreloc = elf_section_data (input_section)->sreloc;
4343 if (sreloc == NULL)
4344 abort ();
4345 loc = sreloc->contents;
4346 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4347 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4348 if (indx)
4349 continue;
4350 else if (r_type == R_386_TLS_LE_32)
4351 relocation = elf_i386_dtpoff_base (info) - relocation;
4352 else
4353 relocation -= elf_i386_dtpoff_base (info);
4354 }
4355 else if (r_type == R_386_TLS_LE_32)
4356 relocation = elf_i386_tpoff (info, relocation);
4357 else
4358 relocation = -elf_i386_tpoff (info, relocation);
4359 break;
4360
4361 default:
4362 break;
4363 }
4364
4365 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4366 because such sections are not SEC_ALLOC and thus ld.so will
4367 not process them. */
4368 if (unresolved_reloc
4369 && !((input_section->flags & SEC_DEBUGGING) != 0
4370 && h->def_dynamic)
4371 && _bfd_elf_section_offset (output_bfd, info, input_section,
4372 rel->r_offset) != (bfd_vma) -1)
4373 {
4374 (*_bfd_error_handler)
4375 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4376 input_bfd,
4377 input_section,
4378 (long) rel->r_offset,
4379 howto->name,
4380 h->root.root.string);
4381 return FALSE;
4382 }
4383
4384 do_relocation:
4385 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4386 contents, rel->r_offset,
4387 relocation, 0);
4388
4389 check_relocation_error:
4390 if (r != bfd_reloc_ok)
4391 {
4392 const char *name;
4393
4394 if (h != NULL)
4395 name = h->root.root.string;
4396 else
4397 {
4398 name = bfd_elf_string_from_elf_section (input_bfd,
4399 symtab_hdr->sh_link,
4400 sym->st_name);
4401 if (name == NULL)
4402 return FALSE;
4403 if (*name == '\0')
4404 name = bfd_section_name (input_bfd, sec);
4405 }
4406
4407 if (r == bfd_reloc_overflow)
4408 {
4409 if (! ((*info->callbacks->reloc_overflow)
4410 (info, (h ? &h->root : NULL), name, howto->name,
4411 (bfd_vma) 0, input_bfd, input_section,
4412 rel->r_offset)))
4413 return FALSE;
4414 }
4415 else
4416 {
4417 (*_bfd_error_handler)
4418 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4419 input_bfd, input_section,
4420 (long) rel->r_offset, name, (int) r);
4421 return FALSE;
4422 }
4423 }
4424 }
4425
4426 return TRUE;
4427 }
4428
4429 /* Finish up dynamic symbol handling. We set the contents of various
4430 dynamic sections here. */
4431
4432 static bfd_boolean
4433 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4434 struct bfd_link_info *info,
4435 struct elf_link_hash_entry *h,
4436 Elf_Internal_Sym *sym)
4437 {
4438 struct elf_i386_link_hash_table *htab;
4439 unsigned plt_entry_size;
4440 const struct elf_i386_backend_data *abed;
4441
4442 htab = elf_i386_hash_table (info);
4443 if (htab == NULL)
4444 return FALSE;
4445
4446 abed = get_elf_i386_backend_data (output_bfd);
4447 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4448
4449 if (h->plt.offset != (bfd_vma) -1)
4450 {
4451 bfd_vma plt_index;
4452 bfd_vma got_offset;
4453 Elf_Internal_Rela rel;
4454 bfd_byte *loc;
4455 asection *plt, *gotplt, *relplt;
4456
4457 /* When building a static executable, use .iplt, .igot.plt and
4458 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4459 if (htab->elf.splt != NULL)
4460 {
4461 plt = htab->elf.splt;
4462 gotplt = htab->elf.sgotplt;
4463 relplt = htab->elf.srelplt;
4464 }
4465 else
4466 {
4467 plt = htab->elf.iplt;
4468 gotplt = htab->elf.igotplt;
4469 relplt = htab->elf.irelplt;
4470 }
4471
4472 /* This symbol has an entry in the procedure linkage table. Set
4473 it up. */
4474
4475 if ((h->dynindx == -1
4476 && !((h->forced_local || info->executable)
4477 && h->def_regular
4478 && h->type == STT_GNU_IFUNC))
4479 || plt == NULL
4480 || gotplt == NULL
4481 || relplt == NULL)
4482 abort ();
4483
4484 /* Get the index in the procedure linkage table which
4485 corresponds to this symbol. This is the index of this symbol
4486 in all the symbols for which we are making plt entries. The
4487 first entry in the procedure linkage table is reserved.
4488
4489 Get the offset into the .got table of the entry that
4490 corresponds to this function. Each .got entry is 4 bytes.
4491 The first three are reserved.
4492
4493 For static executables, we don't reserve anything. */
4494
4495 if (plt == htab->elf.splt)
4496 {
4497 got_offset = h->plt.offset / plt_entry_size - 1;
4498 got_offset = (got_offset + 3) * 4;
4499 }
4500 else
4501 {
4502 got_offset = h->plt.offset / plt_entry_size;
4503 got_offset = got_offset * 4;
4504 }
4505
4506 /* Fill in the entry in the procedure linkage table. */
4507 if (! info->shared)
4508 {
4509 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4510 abed->plt->plt_entry_size);
4511 bfd_put_32 (output_bfd,
4512 (gotplt->output_section->vma
4513 + gotplt->output_offset
4514 + got_offset),
4515 plt->contents + h->plt.offset
4516 + abed->plt->plt_got_offset);
4517
4518 if (abed->is_vxworks)
4519 {
4520 int s, k, reloc_index;
4521
4522 /* Create the R_386_32 relocation referencing the GOT
4523 for this PLT entry. */
4524
4525 /* S: Current slot number (zero-based). */
4526 s = ((h->plt.offset - abed->plt->plt_entry_size)
4527 / abed->plt->plt_entry_size);
4528 /* K: Number of relocations for PLTResolve. */
4529 if (info->shared)
4530 k = PLTRESOLVE_RELOCS_SHLIB;
4531 else
4532 k = PLTRESOLVE_RELOCS;
4533 /* Skip the PLTresolve relocations, and the relocations for
4534 the other PLT slots. */
4535 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4536 loc = (htab->srelplt2->contents + reloc_index
4537 * sizeof (Elf32_External_Rel));
4538
4539 rel.r_offset = (htab->elf.splt->output_section->vma
4540 + htab->elf.splt->output_offset
4541 + h->plt.offset + 2),
4542 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4543 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4544
4545 /* Create the R_386_32 relocation referencing the beginning of
4546 the PLT for this GOT entry. */
4547 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4548 + htab->elf.sgotplt->output_offset
4549 + got_offset);
4550 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4551 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4552 loc + sizeof (Elf32_External_Rel));
4553 }
4554 }
4555 else
4556 {
4557 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4558 abed->plt->plt_entry_size);
4559 bfd_put_32 (output_bfd, got_offset,
4560 plt->contents + h->plt.offset
4561 + abed->plt->plt_got_offset);
4562 }
4563
4564 /* Fill in the entry in the global offset table. */
4565 bfd_put_32 (output_bfd,
4566 (plt->output_section->vma
4567 + plt->output_offset
4568 + h->plt.offset
4569 + abed->plt->plt_lazy_offset),
4570 gotplt->contents + got_offset);
4571
4572 /* Fill in the entry in the .rel.plt section. */
4573 rel.r_offset = (gotplt->output_section->vma
4574 + gotplt->output_offset
4575 + got_offset);
4576 if (h->dynindx == -1
4577 || ((info->executable
4578 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4579 && h->def_regular
4580 && h->type == STT_GNU_IFUNC))
4581 {
4582 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4583 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4584 in the .got.plt section. */
4585 bfd_put_32 (output_bfd,
4586 (h->root.u.def.value
4587 + h->root.u.def.section->output_section->vma
4588 + h->root.u.def.section->output_offset),
4589 gotplt->contents + got_offset);
4590 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4591 /* R_386_IRELATIVE comes last. */
4592 plt_index = htab->next_irelative_index--;
4593 }
4594 else
4595 {
4596 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4597 plt_index = htab->next_jump_slot_index++;
4598 }
4599 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4600 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4601
4602 /* Don't fill PLT entry for static executables. */
4603 if (plt == htab->elf.splt)
4604 {
4605 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4606 plt->contents + h->plt.offset
4607 + abed->plt->plt_reloc_offset);
4608 bfd_put_32 (output_bfd, - (h->plt.offset
4609 + abed->plt->plt_plt_offset + 4),
4610 plt->contents + h->plt.offset
4611 + abed->plt->plt_plt_offset);
4612 }
4613
4614 if (!h->def_regular)
4615 {
4616 /* Mark the symbol as undefined, rather than as defined in
4617 the .plt section. Leave the value if there were any
4618 relocations where pointer equality matters (this is a clue
4619 for the dynamic linker, to make function pointer
4620 comparisons work between an application and shared
4621 library), otherwise set it to zero. If a function is only
4622 called from a binary, there is no need to slow down
4623 shared libraries because of that. */
4624 sym->st_shndx = SHN_UNDEF;
4625 if (!h->pointer_equality_needed)
4626 sym->st_value = 0;
4627 }
4628 }
4629
4630 if (h->got.offset != (bfd_vma) -1
4631 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4632 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4633 {
4634 Elf_Internal_Rela rel;
4635 bfd_byte *loc;
4636
4637 /* This symbol has an entry in the global offset table. Set it
4638 up. */
4639
4640 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4641 abort ();
4642
4643 rel.r_offset = (htab->elf.sgot->output_section->vma
4644 + htab->elf.sgot->output_offset
4645 + (h->got.offset & ~(bfd_vma) 1));
4646
4647 /* If this is a static link, or it is a -Bsymbolic link and the
4648 symbol is defined locally or was forced to be local because
4649 of a version file, we just want to emit a RELATIVE reloc.
4650 The entry in the global offset table will already have been
4651 initialized in the relocate_section function. */
4652 if (h->def_regular
4653 && h->type == STT_GNU_IFUNC)
4654 {
4655 if (info->shared)
4656 {
4657 /* Generate R_386_GLOB_DAT. */
4658 goto do_glob_dat;
4659 }
4660 else
4661 {
4662 asection *plt;
4663
4664 if (!h->pointer_equality_needed)
4665 abort ();
4666
4667 /* For non-shared object, we can't use .got.plt, which
4668 contains the real function addres if we need pointer
4669 equality. We load the GOT entry with the PLT entry. */
4670 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4671 bfd_put_32 (output_bfd,
4672 (plt->output_section->vma
4673 + plt->output_offset + h->plt.offset),
4674 htab->elf.sgot->contents + h->got.offset);
4675 return TRUE;
4676 }
4677 }
4678 else if (info->shared
4679 && SYMBOL_REFERENCES_LOCAL (info, h))
4680 {
4681 BFD_ASSERT((h->got.offset & 1) != 0);
4682 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4683 }
4684 else
4685 {
4686 BFD_ASSERT((h->got.offset & 1) == 0);
4687 do_glob_dat:
4688 bfd_put_32 (output_bfd, (bfd_vma) 0,
4689 htab->elf.sgot->contents + h->got.offset);
4690 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4691 }
4692
4693 loc = htab->elf.srelgot->contents;
4694 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4695 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4696 }
4697
4698 if (h->needs_copy)
4699 {
4700 Elf_Internal_Rela rel;
4701 bfd_byte *loc;
4702
4703 /* This symbol needs a copy reloc. Set it up. */
4704
4705 if (h->dynindx == -1
4706 || (h->root.type != bfd_link_hash_defined
4707 && h->root.type != bfd_link_hash_defweak)
4708 || htab->srelbss == NULL)
4709 abort ();
4710
4711 rel.r_offset = (h->root.u.def.value
4712 + h->root.u.def.section->output_section->vma
4713 + h->root.u.def.section->output_offset);
4714 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4715 loc = htab->srelbss->contents;
4716 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4717 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4718 }
4719
4720 return TRUE;
4721 }
4722
4723 /* Finish up local dynamic symbol handling. We set the contents of
4724 various dynamic sections here. */
4725
4726 static bfd_boolean
4727 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4728 {
4729 struct elf_link_hash_entry *h
4730 = (struct elf_link_hash_entry *) *slot;
4731 struct bfd_link_info *info
4732 = (struct bfd_link_info *) inf;
4733
4734 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4735 h, NULL);
4736 }
4737
4738 /* Used to decide how to sort relocs in an optimal manner for the
4739 dynamic linker, before writing them out. */
4740
4741 static enum elf_reloc_type_class
4742 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4743 {
4744 switch (ELF32_R_TYPE (rela->r_info))
4745 {
4746 case R_386_RELATIVE:
4747 return reloc_class_relative;
4748 case R_386_JUMP_SLOT:
4749 return reloc_class_plt;
4750 case R_386_COPY:
4751 return reloc_class_copy;
4752 default:
4753 return reloc_class_normal;
4754 }
4755 }
4756
4757 /* Finish up the dynamic sections. */
4758
4759 static bfd_boolean
4760 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4761 struct bfd_link_info *info)
4762 {
4763 struct elf_i386_link_hash_table *htab;
4764 bfd *dynobj;
4765 asection *sdyn;
4766 const struct elf_i386_backend_data *abed;
4767
4768 htab = elf_i386_hash_table (info);
4769 if (htab == NULL)
4770 return FALSE;
4771
4772 dynobj = htab->elf.dynobj;
4773 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4774 abed = get_elf_i386_backend_data (output_bfd);
4775
4776 if (htab->elf.dynamic_sections_created)
4777 {
4778 Elf32_External_Dyn *dyncon, *dynconend;
4779
4780 if (sdyn == NULL || htab->elf.sgot == NULL)
4781 abort ();
4782
4783 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4784 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4785 for (; dyncon < dynconend; dyncon++)
4786 {
4787 Elf_Internal_Dyn dyn;
4788 asection *s;
4789
4790 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4791
4792 switch (dyn.d_tag)
4793 {
4794 default:
4795 if (abed->is_vxworks
4796 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4797 break;
4798 continue;
4799
4800 case DT_PLTGOT:
4801 s = htab->elf.sgotplt;
4802 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4803 break;
4804
4805 case DT_JMPREL:
4806 s = htab->elf.srelplt;
4807 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4808 break;
4809
4810 case DT_PLTRELSZ:
4811 s = htab->elf.srelplt;
4812 dyn.d_un.d_val = s->size;
4813 break;
4814
4815 case DT_RELSZ:
4816 /* My reading of the SVR4 ABI indicates that the
4817 procedure linkage table relocs (DT_JMPREL) should be
4818 included in the overall relocs (DT_REL). This is
4819 what Solaris does. However, UnixWare can not handle
4820 that case. Therefore, we override the DT_RELSZ entry
4821 here to make it not include the JMPREL relocs. */
4822 s = htab->elf.srelplt;
4823 if (s == NULL)
4824 continue;
4825 dyn.d_un.d_val -= s->size;
4826 break;
4827
4828 case DT_REL:
4829 /* We may not be using the standard ELF linker script.
4830 If .rel.plt is the first .rel section, we adjust
4831 DT_REL to not include it. */
4832 s = htab->elf.srelplt;
4833 if (s == NULL)
4834 continue;
4835 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4836 continue;
4837 dyn.d_un.d_ptr += s->size;
4838 break;
4839 }
4840
4841 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4842 }
4843
4844 /* Fill in the first entry in the procedure linkage table. */
4845 if (htab->elf.splt && htab->elf.splt->size > 0)
4846 {
4847 if (info->shared)
4848 {
4849 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4850 abed->plt->plt0_entry_size);
4851 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4852 abed->plt0_pad_byte,
4853 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4854 }
4855 else
4856 {
4857 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4858 abed->plt->plt0_entry_size);
4859 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4860 abed->plt0_pad_byte,
4861 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4862 bfd_put_32 (output_bfd,
4863 (htab->elf.sgotplt->output_section->vma
4864 + htab->elf.sgotplt->output_offset
4865 + 4),
4866 htab->elf.splt->contents
4867 + abed->plt->plt0_got1_offset);
4868 bfd_put_32 (output_bfd,
4869 (htab->elf.sgotplt->output_section->vma
4870 + htab->elf.sgotplt->output_offset
4871 + 8),
4872 htab->elf.splt->contents
4873 + abed->plt->plt0_got2_offset);
4874
4875 if (abed->is_vxworks)
4876 {
4877 Elf_Internal_Rela rel;
4878
4879 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4880 On IA32 we use REL relocations so the addend goes in
4881 the PLT directly. */
4882 rel.r_offset = (htab->elf.splt->output_section->vma
4883 + htab->elf.splt->output_offset
4884 + abed->plt->plt0_got1_offset);
4885 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4886 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4887 htab->srelplt2->contents);
4888 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4889 rel.r_offset = (htab->elf.splt->output_section->vma
4890 + htab->elf.splt->output_offset
4891 + abed->plt->plt0_got2_offset);
4892 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4893 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4894 htab->srelplt2->contents +
4895 sizeof (Elf32_External_Rel));
4896 }
4897 }
4898
4899 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4900 really seem like the right value. */
4901 elf_section_data (htab->elf.splt->output_section)
4902 ->this_hdr.sh_entsize = 4;
4903
4904 /* Correct the .rel.plt.unloaded relocations. */
4905 if (abed->is_vxworks && !info->shared)
4906 {
4907 int num_plts = (htab->elf.splt->size
4908 / abed->plt->plt_entry_size) - 1;
4909 unsigned char *p;
4910
4911 p = htab->srelplt2->contents;
4912 if (info->shared)
4913 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4914 else
4915 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4916
4917 for (; num_plts; num_plts--)
4918 {
4919 Elf_Internal_Rela rel;
4920 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4921 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4922 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4923 p += sizeof (Elf32_External_Rel);
4924
4925 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4926 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4927 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4928 p += sizeof (Elf32_External_Rel);
4929 }
4930 }
4931 }
4932 }
4933
4934 if (htab->elf.sgotplt)
4935 {
4936 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4937 {
4938 (*_bfd_error_handler)
4939 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4940 return FALSE;
4941 }
4942
4943 /* Fill in the first three entries in the global offset table. */
4944 if (htab->elf.sgotplt->size > 0)
4945 {
4946 bfd_put_32 (output_bfd,
4947 (sdyn == NULL ? 0
4948 : sdyn->output_section->vma + sdyn->output_offset),
4949 htab->elf.sgotplt->contents);
4950 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4951 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4952 }
4953
4954 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4955 }
4956
4957 /* Adjust .eh_frame for .plt section. */
4958 if (htab->plt_eh_frame != NULL
4959 && htab->plt_eh_frame->contents != NULL)
4960 {
4961 if (htab->elf.splt != NULL
4962 && htab->elf.splt->size != 0
4963 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4964 && htab->elf.splt->output_section != NULL
4965 && htab->plt_eh_frame->output_section != NULL)
4966 {
4967 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4968 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4969 + htab->plt_eh_frame->output_offset
4970 + PLT_FDE_START_OFFSET;
4971 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4972 htab->plt_eh_frame->contents
4973 + PLT_FDE_START_OFFSET);
4974 }
4975 if (htab->plt_eh_frame->sec_info_type
4976 == SEC_INFO_TYPE_EH_FRAME)
4977 {
4978 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4979 htab->plt_eh_frame,
4980 htab->plt_eh_frame->contents))
4981 return FALSE;
4982 }
4983 }
4984
4985 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4986 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4987
4988 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4989 htab_traverse (htab->loc_hash_table,
4990 elf_i386_finish_local_dynamic_symbol,
4991 info);
4992
4993 return TRUE;
4994 }
4995
4996 /* Return address for Ith PLT stub in section PLT, for relocation REL
4997 or (bfd_vma) -1 if it should not be included. */
4998
4999 static bfd_vma
5000 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
5001 const arelent *rel ATTRIBUTE_UNUSED)
5002 {
5003 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5004 }
5005
5006 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5007
5008 static bfd_boolean
5009 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5010 {
5011 if (h->plt.offset != (bfd_vma) -1
5012 && !h->def_regular
5013 && !h->pointer_equality_needed)
5014 return FALSE;
5015
5016 return _bfd_elf_hash_symbol (h);
5017 }
5018
5019 /* Hook called by the linker routine which adds symbols from an object
5020 file. */
5021
5022 static bfd_boolean
5023 elf_i386_add_symbol_hook (bfd * abfd,
5024 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5025 Elf_Internal_Sym * sym,
5026 const char ** namep ATTRIBUTE_UNUSED,
5027 flagword * flagsp ATTRIBUTE_UNUSED,
5028 asection ** secp ATTRIBUTE_UNUSED,
5029 bfd_vma * valp ATTRIBUTE_UNUSED)
5030 {
5031 if ((abfd->flags & DYNAMIC) == 0
5032 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5033 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5034 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5035
5036 return TRUE;
5037 }
5038
5039 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5040 #define TARGET_LITTLE_NAME "elf32-i386"
5041 #define ELF_ARCH bfd_arch_i386
5042 #define ELF_TARGET_ID I386_ELF_DATA
5043 #define ELF_MACHINE_CODE EM_386
5044 #define ELF_MAXPAGESIZE 0x1000
5045
5046 #define elf_backend_can_gc_sections 1
5047 #define elf_backend_can_refcount 1
5048 #define elf_backend_want_got_plt 1
5049 #define elf_backend_plt_readonly 1
5050 #define elf_backend_want_plt_sym 0
5051 #define elf_backend_got_header_size 12
5052 #define elf_backend_plt_alignment 4
5053
5054 /* Support RELA for objdump of prelink objects. */
5055 #define elf_info_to_howto elf_i386_info_to_howto_rel
5056 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5057
5058 #define bfd_elf32_mkobject elf_i386_mkobject
5059
5060 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5061 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5062 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5063 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5064 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5065
5066 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5067 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5068 #define elf_backend_check_relocs elf_i386_check_relocs
5069 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5070 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5071 #define elf_backend_fake_sections elf_i386_fake_sections
5072 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5073 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5074 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5075 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5076 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5077 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5078 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5079 #define elf_backend_relocate_section elf_i386_relocate_section
5080 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5081 #define elf_backend_always_size_sections elf_i386_always_size_sections
5082 #define elf_backend_omit_section_dynsym \
5083 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5084 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5085 #define elf_backend_hash_symbol elf_i386_hash_symbol
5086 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5087 #undef elf_backend_post_process_headers
5088 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5089
5090 #include "elf32-target.h"
5091
5092 /* FreeBSD support. */
5093
5094 #undef TARGET_LITTLE_SYM
5095 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5096 #undef TARGET_LITTLE_NAME
5097 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5098 #undef ELF_OSABI
5099 #define ELF_OSABI ELFOSABI_FREEBSD
5100
5101 /* The kernel recognizes executables as valid only if they carry a
5102 "FreeBSD" label in the ELF header. So we put this label on all
5103 executables and (for simplicity) also all other object files. */
5104
5105 static void
5106 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5107 {
5108 _bfd_elf_set_osabi (abfd, info);
5109
5110 #ifdef OLD_FREEBSD_ABI_LABEL
5111 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5112 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5113 #endif
5114 }
5115
5116 #undef elf_backend_post_process_headers
5117 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5118 #undef elf32_bed
5119 #define elf32_bed elf32_i386_fbsd_bed
5120
5121 #undef elf_backend_add_symbol_hook
5122
5123 #include "elf32-target.h"
5124
5125 /* Solaris 2. */
5126
5127 #undef TARGET_LITTLE_SYM
5128 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5129 #undef TARGET_LITTLE_NAME
5130 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5131
5132 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5133 objects won't be recognized. */
5134 #undef ELF_OSABI
5135
5136 #undef elf32_bed
5137 #define elf32_bed elf32_i386_sol2_bed
5138
5139 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5140 boundary. */
5141 #undef elf_backend_static_tls_alignment
5142 #define elf_backend_static_tls_alignment 8
5143
5144 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5145
5146 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5147 File, p.63. */
5148 #undef elf_backend_want_plt_sym
5149 #define elf_backend_want_plt_sym 1
5150
5151 #include "elf32-target.h"
5152
5153 /* Native Client support. */
5154
5155 #undef TARGET_LITTLE_SYM
5156 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5157 #undef TARGET_LITTLE_NAME
5158 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5159 #undef elf32_bed
5160 #define elf32_bed elf32_i386_nacl_bed
5161
5162 #undef ELF_MAXPAGESIZE
5163 #define ELF_MAXPAGESIZE 0x10000
5164
5165 /* Restore defaults. */
5166 #undef ELF_OSABI
5167 #undef elf_backend_want_plt_sym
5168 #define elf_backend_want_plt_sym 0
5169 #undef elf_backend_post_process_headers
5170 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5171 #undef elf_backend_static_tls_alignment
5172
5173 /* NaCl uses substantially different PLT entries for the same effects. */
5174
5175 #undef elf_backend_plt_alignment
5176 #define elf_backend_plt_alignment 5
5177 #define NACL_PLT_ENTRY_SIZE 64
5178 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5179
5180 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5181 {
5182 0xff, 0x35, /* pushl contents of address */
5183 0, 0, 0, 0, /* replaced with address of .got + 4. */
5184 0x8b, 0x0d, /* movl contents of address, %ecx */
5185 0, 0, 0, 0, /* replaced with address of .got + 8. */
5186 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5187 0xff, 0xe1 /* jmp *%ecx */
5188 };
5189
5190 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5191 {
5192 0x8b, 0x0d, /* movl contents of address, %ecx */
5193 0, 0, 0, 0, /* replaced with GOT slot address. */
5194 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5195 0xff, 0xe1, /* jmp *%ecx */
5196
5197 /* Pad to the next 32-byte boundary with nop instructions. */
5198 0x90,
5199 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5200 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5201
5202 /* Lazy GOT entries point here (32-byte aligned). */
5203 0x68, /* pushl immediate */
5204 0, 0, 0, 0, /* replaced with reloc offset. */
5205 0xe9, /* jmp relative */
5206 0, 0, 0, 0, /* replaced with offset to .plt. */
5207
5208 /* Pad to the next 32-byte boundary with nop instructions. */
5209 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5210 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5211 0x90, 0x90
5212 };
5213
5214 static const bfd_byte
5215 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5216 {
5217 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5218 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5219 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5220 0xff, 0xe1, /* jmp *%ecx */
5221
5222 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5223 so pad to that size with nop instructions. */
5224 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5225 };
5226
5227 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5228 {
5229 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5230 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5231 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5232 0xff, 0xe1, /* jmp *%ecx */
5233
5234 /* Pad to the next 32-byte boundary with nop instructions. */
5235 0x90,
5236 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5237 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5238
5239 /* Lazy GOT entries point here (32-byte aligned). */
5240 0x68, /* pushl immediate */
5241 0, 0, 0, 0, /* replaced with offset into relocation table. */
5242 0xe9, /* jmp relative */
5243 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5244
5245 /* Pad to the next 32-byte boundary with nop instructions. */
5246 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5247 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5248 0x90, 0x90
5249 };
5250
5251 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5252 {
5253 #if (PLT_CIE_LENGTH != 20 \
5254 || PLT_FDE_LENGTH != 36 \
5255 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5256 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5257 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5258 #endif
5259 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5260 0, 0, 0, 0, /* CIE ID */
5261 1, /* CIE version */
5262 'z', 'R', 0, /* Augmentation string */
5263 1, /* Code alignment factor */
5264 0x7c, /* Data alignment factor: -4 */
5265 8, /* Return address column */
5266 1, /* Augmentation size */
5267 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5268 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5269 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5270 DW_CFA_nop, DW_CFA_nop,
5271
5272 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5273 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5274 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5275 0, 0, 0, 0, /* .plt size goes here */
5276 0, /* Augmentation size */
5277 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5278 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5279 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5280 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5281 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5282 13, /* Block length */
5283 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5284 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5285 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5286 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5287 DW_CFA_nop, DW_CFA_nop
5288 };
5289
5290 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5291 {
5292 elf_i386_nacl_plt0_entry, /* plt0_entry */
5293 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5294 2, /* plt0_got1_offset */
5295 8, /* plt0_got2_offset */
5296 elf_i386_nacl_plt_entry, /* plt_entry */
5297 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5298 2, /* plt_got_offset */
5299 33, /* plt_reloc_offset */
5300 38, /* plt_plt_offset */
5301 32, /* plt_lazy_offset */
5302 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5303 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5304 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5305 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5306 };
5307
5308 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5309 {
5310 &elf_i386_nacl_plt, /* plt */
5311 0x90, /* plt0_pad_byte: nop insn */
5312 0, /* is_vxworks */
5313 };
5314
5315 #undef elf_backend_arch_data
5316 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5317
5318 #undef elf_backend_modify_segment_map
5319 #define elf_backend_modify_segment_map nacl_modify_segment_map
5320 #undef elf_backend_modify_program_headers
5321 #define elf_backend_modify_program_headers nacl_modify_program_headers
5322
5323 #include "elf32-target.h"
5324
5325 /* Restore defaults. */
5326 #undef elf_backend_modify_segment_map
5327 #undef elf_backend_modify_program_headers
5328
5329 /* VxWorks support. */
5330
5331 #undef TARGET_LITTLE_SYM
5332 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5333 #undef TARGET_LITTLE_NAME
5334 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5335 #undef ELF_OSABI
5336 #undef elf_backend_plt_alignment
5337 #define elf_backend_plt_alignment 4
5338
5339 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5340 {
5341 &elf_i386_plt, /* plt */
5342 0x90, /* plt0_pad_byte */
5343 1, /* is_vxworks */
5344 };
5345
5346 #undef elf_backend_arch_data
5347 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5348
5349 #undef elf_backend_relocs_compatible
5350 #undef elf_backend_post_process_headers
5351 #undef elf_backend_add_symbol_hook
5352 #define elf_backend_add_symbol_hook \
5353 elf_vxworks_add_symbol_hook
5354 #undef elf_backend_link_output_symbol_hook
5355 #define elf_backend_link_output_symbol_hook \
5356 elf_vxworks_link_output_symbol_hook
5357 #undef elf_backend_emit_relocs
5358 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5359 #undef elf_backend_final_write_processing
5360 #define elf_backend_final_write_processing \
5361 elf_vxworks_final_write_processing
5362 #undef elf_backend_static_tls_alignment
5363
5364 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5365 define it. */
5366 #undef elf_backend_want_plt_sym
5367 #define elf_backend_want_plt_sym 1
5368
5369 #undef elf32_bed
5370 #define elf32_bed elf32_i386_vxworks_bed
5371
5372 #include "elf32-target.h"