7af68634e64853c548b859a093622d4ec065b888
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "opcode/i386.h"
33
34 /* 386 uses REL relocations instead of RELA. */
35 #define USE_REL 1
36
37 #include "elf/i386.h"
38
39 static reloc_howto_type elf_howto_table[]=
40 {
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
74
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
81
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
113
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
153
154 /* Another gap. */
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
157
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
160 0, /* rightshift */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
162 0, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
169 0, /* src_mask */
170 0, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 0, /* bitsize */
178 FALSE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0, /* dst_mask */
186 FALSE) /* pcrel_offset */
187
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
189
190 };
191
192 #ifdef DEBUG_GEN_RELOC
193 #define TRACE(str) \
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 #else
196 #define TRACE(str)
197 #endif
198
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
202 {
203 switch (code)
204 {
205 case BFD_RELOC_NONE:
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
208
209 case BFD_RELOC_32:
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_CTOR:
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
216
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
220
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
224
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
228
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
232
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
236
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
240
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
244
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
248
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
252
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
273
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
277
278 case BFD_RELOC_16:
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
281
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
285
286 case BFD_RELOC_8:
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
289
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
293
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
318
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
330
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
334
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
338
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
342
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
346
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
350
351 default:
352 break;
353 }
354
355 TRACE ("Unknown");
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
369
370 return NULL;
371 }
372
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
375 {
376 unsigned int indx;
377
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
385 {
386 /* xgettext:c-format */
387 _bfd_error_handler (_("%B: invalid relocation type %d"),
388 abfd, (int) r_type);
389 indx = R_386_NONE;
390 }
391 /* PR 17512: file: 0f67f69d. */
392 if (elf_howto_table [indx].type != r_type)
393 return NULL;
394 return &elf_howto_table[indx];
395 }
396
397 static void
398 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
399 arelent *cache_ptr,
400 Elf_Internal_Rela *dst)
401 {
402 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
403 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
404 }
405
406 /* Return whether a symbol name implies a local label. The UnixWare
407 2.1 cc generates temporary symbols that start with .X, so we
408 recognize them here. FIXME: do other SVR4 compilers also use .X?.
409 If so, we should move the .X recognition into
410 _bfd_elf_is_local_label_name. */
411
412 static bfd_boolean
413 elf_i386_is_local_label_name (bfd *abfd, const char *name)
414 {
415 if (name[0] == '.' && name[1] == 'X')
416 return TRUE;
417
418 return _bfd_elf_is_local_label_name (abfd, name);
419 }
420 \f
421 /* Support for core dump NOTE sections. */
422
423 static bfd_boolean
424 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
425 {
426 int offset;
427 size_t size;
428
429 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
430 {
431 int pr_version = bfd_get_32 (abfd, note->descdata);
432
433 if (pr_version != 1)
434 return FALSE;
435
436 /* pr_cursig */
437 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
438
439 /* pr_pid */
440 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
441
442 /* pr_reg */
443 offset = 28;
444 size = bfd_get_32 (abfd, note->descdata + 8);
445 }
446 else
447 {
448 switch (note->descsz)
449 {
450 default:
451 return FALSE;
452
453 case 144: /* Linux/i386 */
454 /* pr_cursig */
455 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
456
457 /* pr_pid */
458 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
459
460 /* pr_reg */
461 offset = 72;
462 size = 68;
463
464 break;
465 }
466 }
467
468 /* Make a ".reg/999" section. */
469 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
470 size, note->descpos + offset);
471 }
472
473 static bfd_boolean
474 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
475 {
476 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
477 {
478 int pr_version = bfd_get_32 (abfd, note->descdata);
479
480 if (pr_version != 1)
481 return FALSE;
482
483 elf_tdata (abfd)->core->program
484 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
485 elf_tdata (abfd)->core->command
486 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
487 }
488 else
489 {
490 switch (note->descsz)
491 {
492 default:
493 return FALSE;
494
495 case 124: /* Linux/i386 elf_prpsinfo. */
496 elf_tdata (abfd)->core->pid
497 = bfd_get_32 (abfd, note->descdata + 12);
498 elf_tdata (abfd)->core->program
499 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
500 elf_tdata (abfd)->core->command
501 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
502 }
503 }
504
505 /* Note that for some reason, a spurious space is tacked
506 onto the end of the args in some (at least one anyway)
507 implementations, so strip it off if it exists. */
508 {
509 char *command = elf_tdata (abfd)->core->command;
510 int n = strlen (command);
511
512 if (0 < n && command[n - 1] == ' ')
513 command[n - 1] = '\0';
514 }
515
516 return TRUE;
517 }
518 \f
519 /* Functions for the i386 ELF linker.
520
521 In order to gain some understanding of code in this file without
522 knowing all the intricate details of the linker, note the
523 following:
524
525 Functions named elf_i386_* are called by external routines, other
526 functions are only called locally. elf_i386_* functions appear
527 in this file more or less in the order in which they are called
528 from external routines. eg. elf_i386_check_relocs is called
529 early in the link process, elf_i386_finish_dynamic_sections is
530 one of the last functions. */
531
532
533 /* The name of the dynamic interpreter. This is put in the .interp
534 section. */
535
536 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
537
538 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
539 copying dynamic variables from a shared lib into an app's dynbss
540 section, and instead use a dynamic relocation to point into the
541 shared lib. */
542 #define ELIMINATE_COPY_RELOCS 1
543
544 /* The size in bytes of an entry in the procedure linkage table. */
545
546 #define PLT_ENTRY_SIZE 16
547
548 /* The first entry in an absolute procedure linkage table looks like
549 this. See the SVR4 ABI i386 supplement to see how this works.
550 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
551
552 static const bfd_byte elf_i386_plt0_entry[12] =
553 {
554 0xff, 0x35, /* pushl contents of address */
555 0, 0, 0, 0, /* replaced with address of .got + 4. */
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0 /* replaced with address of .got + 8. */
558 };
559
560 /* Subsequent entries in an absolute procedure linkage table look like
561 this. */
562
563 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
564 {
565 0xff, 0x25, /* jmp indirect */
566 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
567 0x68, /* pushl immediate */
568 0, 0, 0, 0, /* replaced with offset into relocation table. */
569 0xe9, /* jmp relative */
570 0, 0, 0, 0 /* replaced with offset to start of .plt. */
571 };
572
573 /* The first entry in a PIC procedure linkage table look like this.
574 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
575
576 static const bfd_byte elf_i386_pic_plt0_entry[12] =
577 {
578 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
579 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
580 };
581
582 /* Subsequent entries in a PIC procedure linkage table look like this. */
583
584 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
585 {
586 0xff, 0xa3, /* jmp *offset(%ebx) */
587 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
588 0x68, /* pushl immediate */
589 0, 0, 0, 0, /* replaced with offset into relocation table. */
590 0xe9, /* jmp relative */
591 0, 0, 0, 0 /* replaced with offset to start of .plt. */
592 };
593
594 /* Entries in the GOT procedure linkage table look like this. */
595
596 static const bfd_byte elf_i386_got_plt_entry[8] =
597 {
598 0xff, 0x25, /* jmp indirect */
599 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
600 0x66, 0x90 /* xchg %ax,%ax */
601 };
602
603 /* Entries in the PIC GOT procedure linkage table look like this. */
604
605 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
606 {
607 0xff, 0xa3, /* jmp *offset(%ebx) */
608 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
610 };
611
612 /* .eh_frame covering the .plt section. */
613
614 static const bfd_byte elf_i386_eh_frame_plt[] =
615 {
616 #define PLT_CIE_LENGTH 20
617 #define PLT_FDE_LENGTH 36
618 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
619 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
620 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
621 0, 0, 0, 0, /* CIE ID */
622 1, /* CIE version */
623 'z', 'R', 0, /* Augmentation string */
624 1, /* Code alignment factor */
625 0x7c, /* Data alignment factor */
626 8, /* Return address column */
627 1, /* Augmentation size */
628 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
629 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
630 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
631 DW_CFA_nop, DW_CFA_nop,
632
633 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
634 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
635 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
636 0, 0, 0, 0, /* .plt size goes here */
637 0, /* Augmentation size */
638 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
639 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
640 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
641 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
642 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
643 11, /* Block length */
644 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
645 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
646 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
647 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
648 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
649 };
650
651 /* .eh_frame covering the .plt.got section. */
652
653 static const bfd_byte elf_i386_eh_frame_plt_got[] =
654 {
655 #define PLT_GOT_FDE_LENGTH 16
656 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
657 0, 0, 0, 0, /* CIE ID */
658 1, /* CIE version */
659 'z', 'R', 0, /* Augmentation string */
660 1, /* Code alignment factor */
661 0x7c, /* Data alignment factor */
662 8, /* Return address column */
663 1, /* Augmentation size */
664 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
665 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
666 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
667 DW_CFA_nop, DW_CFA_nop,
668
669 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
670 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
671 0, 0, 0, 0, /* the start of .plt.got goes here */
672 0, 0, 0, 0, /* .plt.got size goes here */
673 0, /* Augmentation size */
674 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
675 };
676
677 struct elf_i386_plt_layout
678 {
679 /* The first entry in an absolute procedure linkage table looks like this. */
680 const bfd_byte *plt0_entry;
681 unsigned int plt0_entry_size;
682
683 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
684 unsigned int plt0_got1_offset;
685 unsigned int plt0_got2_offset;
686
687 /* Later entries in an absolute procedure linkage table look like this. */
688 const bfd_byte *plt_entry;
689 unsigned int plt_entry_size;
690
691 /* Offsets into plt_entry that are to be replaced with... */
692 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
693 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
694 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
695
696 /* Offset into plt_entry where the initial value of the GOT entry points. */
697 unsigned int plt_lazy_offset;
698
699 /* The first entry in a PIC procedure linkage table looks like this. */
700 const bfd_byte *pic_plt0_entry;
701
702 /* Subsequent entries in a PIC procedure linkage table look like this. */
703 const bfd_byte *pic_plt_entry;
704
705 /* .eh_frame covering the .plt section. */
706 const bfd_byte *eh_frame_plt;
707 unsigned int eh_frame_plt_size;
708
709 /* .eh_frame covering the .plt.got section. */
710 const bfd_byte *eh_frame_plt_got;
711 unsigned int eh_frame_plt_got_size;
712 };
713
714 #define GET_PLT_ENTRY_SIZE(abfd) \
715 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
716
717 /* These are the standard parameters. */
718 static const struct elf_i386_plt_layout elf_i386_plt =
719 {
720 elf_i386_plt0_entry, /* plt0_entry */
721 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
722 2, /* plt0_got1_offset */
723 8, /* plt0_got2_offset */
724 elf_i386_plt_entry, /* plt_entry */
725 PLT_ENTRY_SIZE, /* plt_entry_size */
726 2, /* plt_got_offset */
727 7, /* plt_reloc_offset */
728 12, /* plt_plt_offset */
729 6, /* plt_lazy_offset */
730 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
731 elf_i386_pic_plt_entry, /* pic_plt_entry */
732 elf_i386_eh_frame_plt, /* eh_frame_plt */
733 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
734 elf_i386_eh_frame_plt_got, /* eh_frame_plt_got */
735 sizeof (elf_i386_eh_frame_plt_got), /* eh_frame_plt_got_size */
736 };
737 \f
738
739 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
740 for the PLTResolve stub and then for each PLT entry. */
741 #define PLTRESOLVE_RELOCS_SHLIB 0
742 #define PLTRESOLVE_RELOCS 2
743 #define PLT_NON_JUMP_SLOT_RELOCS 2
744
745 /* Architecture-specific backend data for i386. */
746
747 struct elf_i386_backend_data
748 {
749 /* Parameters describing PLT generation. */
750 const struct elf_i386_plt_layout *plt;
751
752 /* Value used to fill the unused bytes of the first PLT entry. */
753 bfd_byte plt0_pad_byte;
754
755 /* True if the target system is VxWorks. */
756 int is_vxworks;
757 };
758
759 #define get_elf_i386_backend_data(abfd) \
760 ((const struct elf_i386_backend_data *) \
761 get_elf_backend_data (abfd)->arch_data)
762
763 /* These are the standard parameters. */
764 static const struct elf_i386_backend_data elf_i386_arch_bed =
765 {
766 &elf_i386_plt, /* plt */
767 0, /* plt0_pad_byte */
768 0, /* is_vxworks */
769 };
770
771 #define elf_backend_arch_data &elf_i386_arch_bed
772
773 /* Is a undefined weak symbol which is resolved to 0. Reference to an
774 undefined weak symbol is resolved to 0 when building executable if
775 it isn't dynamic and
776 1. Has non-GOT/non-PLT relocations in text section. Or
777 2. Has no GOT/PLT relocation.
778 */
779 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
780 ((EH)->elf.root.type == bfd_link_hash_undefweak \
781 && bfd_link_executable (INFO) \
782 && (elf_i386_hash_table (INFO)->interp == NULL \
783 || !(GOT_RELOC) \
784 || (EH)->has_non_got_reloc \
785 || !(INFO)->dynamic_undefined_weak))
786
787 /* i386 ELF linker hash entry. */
788
789 struct elf_i386_link_hash_entry
790 {
791 struct elf_link_hash_entry elf;
792
793 /* Track dynamic relocs copied for this symbol. */
794 struct elf_dyn_relocs *dyn_relocs;
795
796 #define GOT_UNKNOWN 0
797 #define GOT_NORMAL 1
798 #define GOT_TLS_GD 2
799 #define GOT_TLS_IE 4
800 #define GOT_TLS_IE_POS 5
801 #define GOT_TLS_IE_NEG 6
802 #define GOT_TLS_IE_BOTH 7
803 #define GOT_TLS_GDESC 8
804 #define GOT_TLS_GD_BOTH_P(type) \
805 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
806 #define GOT_TLS_GD_P(type) \
807 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
808 #define GOT_TLS_GDESC_P(type) \
809 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
810 #define GOT_TLS_GD_ANY_P(type) \
811 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
812 unsigned char tls_type;
813
814 /* Symbol is referenced by R_386_GOTOFF relocation. */
815 unsigned int gotoff_ref : 1;
816
817 /* Symbol has GOT or PLT relocations. */
818 unsigned int has_got_reloc : 1;
819
820 /* Symbol has non-GOT/non-PLT relocations in text sections. */
821 unsigned int has_non_got_reloc : 1;
822
823 /* 0: symbol isn't ___tls_get_addr.
824 1: symbol is ___tls_get_addr.
825 2: symbol is unknown. */
826 unsigned int tls_get_addr : 2;
827
828 /* Reference count of C/C++ function pointer relocations in read-write
829 section which can be resolved at run-time. */
830 bfd_signed_vma func_pointer_refcount;
831
832 /* Information about the GOT PLT entry. Filled when there are both
833 GOT and PLT relocations against the same function. */
834 union gotplt_union plt_got;
835
836 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
837 starting at the end of the jump table. */
838 bfd_vma tlsdesc_got;
839 };
840
841 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
842
843 struct elf_i386_obj_tdata
844 {
845 struct elf_obj_tdata root;
846
847 /* tls_type for each local got entry. */
848 char *local_got_tls_type;
849
850 /* GOTPLT entries for TLS descriptors. */
851 bfd_vma *local_tlsdesc_gotent;
852 };
853
854 #define elf_i386_tdata(abfd) \
855 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
856
857 #define elf_i386_local_got_tls_type(abfd) \
858 (elf_i386_tdata (abfd)->local_got_tls_type)
859
860 #define elf_i386_local_tlsdesc_gotent(abfd) \
861 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
862
863 #define is_i386_elf(bfd) \
864 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
865 && elf_tdata (bfd) != NULL \
866 && elf_object_id (bfd) == I386_ELF_DATA)
867
868 static bfd_boolean
869 elf_i386_mkobject (bfd *abfd)
870 {
871 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
872 I386_ELF_DATA);
873 }
874
875 /* i386 ELF linker hash table. */
876
877 struct elf_i386_link_hash_table
878 {
879 struct elf_link_hash_table elf;
880
881 /* Short-cuts to get to dynamic linker sections. */
882 asection *interp;
883 asection *plt_eh_frame;
884 asection *plt_got;
885 asection *plt_got_eh_frame;
886
887 union
888 {
889 bfd_signed_vma refcount;
890 bfd_vma offset;
891 } tls_ldm_got;
892
893 /* The amount of space used by the reserved portion of the sgotplt
894 section, plus whatever space is used by the jump slots. */
895 bfd_vma sgotplt_jump_table_size;
896
897 /* Small local sym cache. */
898 struct sym_cache sym_cache;
899
900 /* _TLS_MODULE_BASE_ symbol. */
901 struct bfd_link_hash_entry *tls_module_base;
902
903 /* Used by local STT_GNU_IFUNC symbols. */
904 htab_t loc_hash_table;
905 void * loc_hash_memory;
906
907 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
908 asection *srelplt2;
909
910 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
911 bfd_vma next_tls_desc_index;
912
913 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
914 bfd_vma next_jump_slot_index;
915
916 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
917 bfd_vma next_irelative_index;
918
919 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
920 to read-only sections. */
921 bfd_boolean readonly_dynrelocs_against_ifunc;
922 };
923
924 /* Get the i386 ELF linker hash table from a link_info structure. */
925
926 #define elf_i386_hash_table(p) \
927 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
928 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
929
930 #define elf_i386_compute_jump_table_size(htab) \
931 ((htab)->elf.srelplt->reloc_count * 4)
932
933 /* Create an entry in an i386 ELF linker hash table. */
934
935 static struct bfd_hash_entry *
936 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
937 struct bfd_hash_table *table,
938 const char *string)
939 {
940 /* Allocate the structure if it has not already been allocated by a
941 subclass. */
942 if (entry == NULL)
943 {
944 entry = (struct bfd_hash_entry *)
945 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
946 if (entry == NULL)
947 return entry;
948 }
949
950 /* Call the allocation method of the superclass. */
951 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
952 if (entry != NULL)
953 {
954 struct elf_i386_link_hash_entry *eh;
955
956 eh = (struct elf_i386_link_hash_entry *) entry;
957 eh->dyn_relocs = NULL;
958 eh->tls_type = GOT_UNKNOWN;
959 eh->gotoff_ref = 0;
960 eh->has_got_reloc = 0;
961 eh->has_non_got_reloc = 0;
962 eh->tls_get_addr = 2;
963 eh->func_pointer_refcount = 0;
964 eh->plt_got.offset = (bfd_vma) -1;
965 eh->tlsdesc_got = (bfd_vma) -1;
966 }
967
968 return entry;
969 }
970
971 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
972 for local symbol so that we can handle local STT_GNU_IFUNC symbols
973 as global symbol. We reuse indx and dynstr_index for local symbol
974 hash since they aren't used by global symbols in this backend. */
975
976 static hashval_t
977 elf_i386_local_htab_hash (const void *ptr)
978 {
979 struct elf_link_hash_entry *h
980 = (struct elf_link_hash_entry *) ptr;
981 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
982 }
983
984 /* Compare local hash entries. */
985
986 static int
987 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
988 {
989 struct elf_link_hash_entry *h1
990 = (struct elf_link_hash_entry *) ptr1;
991 struct elf_link_hash_entry *h2
992 = (struct elf_link_hash_entry *) ptr2;
993
994 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
995 }
996
997 /* Find and/or create a hash entry for local symbol. */
998
999 static struct elf_link_hash_entry *
1000 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
1001 bfd *abfd, const Elf_Internal_Rela *rel,
1002 bfd_boolean create)
1003 {
1004 struct elf_i386_link_hash_entry e, *ret;
1005 asection *sec = abfd->sections;
1006 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
1007 ELF32_R_SYM (rel->r_info));
1008 void **slot;
1009
1010 e.elf.indx = sec->id;
1011 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1012 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
1013 create ? INSERT : NO_INSERT);
1014
1015 if (!slot)
1016 return NULL;
1017
1018 if (*slot)
1019 {
1020 ret = (struct elf_i386_link_hash_entry *) *slot;
1021 return &ret->elf;
1022 }
1023
1024 ret = (struct elf_i386_link_hash_entry *)
1025 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1026 sizeof (struct elf_i386_link_hash_entry));
1027 if (ret)
1028 {
1029 memset (ret, 0, sizeof (*ret));
1030 ret->elf.indx = sec->id;
1031 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1032 ret->elf.dynindx = -1;
1033 ret->func_pointer_refcount = 0;
1034 ret->plt_got.offset = (bfd_vma) -1;
1035 *slot = ret;
1036 }
1037 return &ret->elf;
1038 }
1039
1040 /* Destroy an i386 ELF linker hash table. */
1041
1042 static void
1043 elf_i386_link_hash_table_free (bfd *obfd)
1044 {
1045 struct elf_i386_link_hash_table *htab
1046 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1047
1048 if (htab->loc_hash_table)
1049 htab_delete (htab->loc_hash_table);
1050 if (htab->loc_hash_memory)
1051 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1052 _bfd_elf_link_hash_table_free (obfd);
1053 }
1054
1055 /* Create an i386 ELF linker hash table. */
1056
1057 static struct bfd_link_hash_table *
1058 elf_i386_link_hash_table_create (bfd *abfd)
1059 {
1060 struct elf_i386_link_hash_table *ret;
1061 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1062
1063 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1064 if (ret == NULL)
1065 return NULL;
1066
1067 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1068 elf_i386_link_hash_newfunc,
1069 sizeof (struct elf_i386_link_hash_entry),
1070 I386_ELF_DATA))
1071 {
1072 free (ret);
1073 return NULL;
1074 }
1075
1076 ret->loc_hash_table = htab_try_create (1024,
1077 elf_i386_local_htab_hash,
1078 elf_i386_local_htab_eq,
1079 NULL);
1080 ret->loc_hash_memory = objalloc_create ();
1081 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1082 {
1083 elf_i386_link_hash_table_free (abfd);
1084 return NULL;
1085 }
1086 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1087
1088 return &ret->elf.root;
1089 }
1090
1091 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1092 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1093 hash table. */
1094
1095 static bfd_boolean
1096 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1097 {
1098 struct elf_i386_link_hash_table *htab;
1099
1100 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1101 return FALSE;
1102
1103 htab = elf_i386_hash_table (info);
1104 if (htab == NULL)
1105 return FALSE;
1106
1107 /* Set the contents of the .interp section to the interpreter. */
1108 if (bfd_link_executable (info) && !info->nointerp)
1109 {
1110 asection *s = bfd_get_linker_section (dynobj, ".interp");
1111 if (s == NULL)
1112 abort ();
1113 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1114 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1115 htab->interp = s;
1116 }
1117
1118 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1119 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1120 &htab->srelplt2))
1121 return FALSE;
1122
1123 if (!info->no_ld_generated_unwind_info
1124 && htab->plt_eh_frame == NULL
1125 && htab->elf.splt != NULL)
1126 {
1127 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1128 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1129 | SEC_LINKER_CREATED);
1130 htab->plt_eh_frame
1131 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1132 if (htab->plt_eh_frame == NULL
1133 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1134 return FALSE;
1135 }
1136
1137 return TRUE;
1138 }
1139
1140 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1141
1142 static void
1143 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1144 struct elf_link_hash_entry *dir,
1145 struct elf_link_hash_entry *ind)
1146 {
1147 struct elf_i386_link_hash_entry *edir, *eind;
1148
1149 edir = (struct elf_i386_link_hash_entry *) dir;
1150 eind = (struct elf_i386_link_hash_entry *) ind;
1151
1152 if (eind->dyn_relocs != NULL)
1153 {
1154 if (edir->dyn_relocs != NULL)
1155 {
1156 struct elf_dyn_relocs **pp;
1157 struct elf_dyn_relocs *p;
1158
1159 /* Add reloc counts against the indirect sym to the direct sym
1160 list. Merge any entries against the same section. */
1161 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1162 {
1163 struct elf_dyn_relocs *q;
1164
1165 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1166 if (q->sec == p->sec)
1167 {
1168 q->pc_count += p->pc_count;
1169 q->count += p->count;
1170 *pp = p->next;
1171 break;
1172 }
1173 if (q == NULL)
1174 pp = &p->next;
1175 }
1176 *pp = edir->dyn_relocs;
1177 }
1178
1179 edir->dyn_relocs = eind->dyn_relocs;
1180 eind->dyn_relocs = NULL;
1181 }
1182
1183 if (ind->root.type == bfd_link_hash_indirect
1184 && dir->got.refcount <= 0)
1185 {
1186 edir->tls_type = eind->tls_type;
1187 eind->tls_type = GOT_UNKNOWN;
1188 }
1189
1190 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1191 generate a R_386_COPY reloc. */
1192 edir->gotoff_ref |= eind->gotoff_ref;
1193
1194 edir->has_got_reloc |= eind->has_got_reloc;
1195 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1196
1197 if (ELIMINATE_COPY_RELOCS
1198 && ind->root.type != bfd_link_hash_indirect
1199 && dir->dynamic_adjusted)
1200 {
1201 /* If called to transfer flags for a weakdef during processing
1202 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1203 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1204 if (dir->versioned != versioned_hidden)
1205 dir->ref_dynamic |= ind->ref_dynamic;
1206 dir->ref_regular |= ind->ref_regular;
1207 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1208 dir->needs_plt |= ind->needs_plt;
1209 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1210 }
1211 else
1212 {
1213 if (eind->func_pointer_refcount > 0)
1214 {
1215 edir->func_pointer_refcount += eind->func_pointer_refcount;
1216 eind->func_pointer_refcount = 0;
1217 }
1218
1219 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1220 }
1221 }
1222
1223 /* Return TRUE if the TLS access code sequence support transition
1224 from R_TYPE. */
1225
1226 static bfd_boolean
1227 elf_i386_check_tls_transition (asection *sec,
1228 bfd_byte *contents,
1229 Elf_Internal_Shdr *symtab_hdr,
1230 struct elf_link_hash_entry **sym_hashes,
1231 unsigned int r_type,
1232 const Elf_Internal_Rela *rel,
1233 const Elf_Internal_Rela *relend)
1234 {
1235 unsigned int val, type, reg;
1236 unsigned long r_symndx;
1237 struct elf_link_hash_entry *h;
1238 bfd_vma offset;
1239 bfd_byte *call;
1240 bfd_boolean indirect_call, tls_get_addr;
1241
1242 offset = rel->r_offset;
1243 switch (r_type)
1244 {
1245 case R_386_TLS_GD:
1246 case R_386_TLS_LDM:
1247 if (offset < 2 || (rel + 1) >= relend)
1248 return FALSE;
1249
1250 indirect_call = FALSE;
1251 call = contents + offset + 4;
1252 val = *(call - 5);
1253 type = *(call - 6);
1254 if (r_type == R_386_TLS_GD)
1255 {
1256 /* Check transition from GD access model. Only
1257 leal foo@tlsgd(,%ebx,1), %eax
1258 call ___tls_get_addr@PLT
1259 or
1260 leal foo@tlsgd(%ebx) %eax
1261 call ___tls_get_addr@PLT
1262 nop
1263 or
1264 leal foo@tlsgd(%reg), %eax
1265 call *___tls_get_addr@GOT(%reg)
1266 which may be converted to
1267 addr32 call ___tls_get_addr
1268 can transit to different access model. */
1269 if ((offset + 10) > sec->size
1270 || (type != 0x8d && type != 0x04))
1271 return FALSE;
1272
1273 if (type == 0x04)
1274 {
1275 /* leal foo@tlsgd(,%ebx,1), %eax
1276 call ___tls_get_addr@PLT */
1277 if (offset < 3)
1278 return FALSE;
1279
1280 if (*(call - 7) != 0x8d
1281 || val != 0x1d
1282 || call[0] != 0xe8)
1283 return FALSE;
1284 }
1285 else
1286 {
1287 /* This must be
1288 leal foo@tlsgd(%ebx), %eax
1289 call ___tls_get_addr@PLT
1290 nop
1291 or
1292 leal foo@tlsgd(%reg), %eax
1293 call *___tls_get_addr@GOT(%reg)
1294 which may be converted to
1295 addr32 call ___tls_get_addr
1296
1297 %eax can't be used as the GOT base register since it
1298 is used to pass parameter to ___tls_get_addr. */
1299 reg = val & 7;
1300 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1301 return FALSE;
1302
1303 indirect_call = call[0] == 0xff;
1304 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
1305 && !(call[0] == 0x67 && call[1] == 0xe8)
1306 && !(indirect_call
1307 && (call[1] & 0xf8) == 0x90
1308 && (call[1] & 0x7) == reg))
1309 return FALSE;
1310 }
1311 }
1312 else
1313 {
1314 /* Check transition from LD access model. Only
1315 leal foo@tlsldm(%ebx), %eax
1316 call ___tls_get_addr@PLT
1317 or
1318 leal foo@tlsldm(%reg), %eax
1319 call *___tls_get_addr@GOT(%reg)
1320 which may be converted to
1321 addr32 call ___tls_get_addr
1322 can transit to different access model. */
1323 if (type != 0x8d || (offset + 9) > sec->size)
1324 return FALSE;
1325
1326 /* %eax can't be used as the GOT base register since it is
1327 used to pass parameter to ___tls_get_addr. */
1328 reg = val & 7;
1329 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1330 return FALSE;
1331
1332 indirect_call = call[0] == 0xff;
1333 if (!(reg == 3 && call[0] == 0xe8)
1334 && !(call[0] == 0x67 && call[1] == 0xe8)
1335 && !(indirect_call
1336 && (call[1] & 0xf8) == 0x90
1337 && (call[1] & 0x7) == reg))
1338 return FALSE;
1339 }
1340
1341 r_symndx = ELF32_R_SYM (rel[1].r_info);
1342 if (r_symndx < symtab_hdr->sh_info)
1343 return FALSE;
1344
1345 tls_get_addr = FALSE;
1346 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1347 if (h != NULL && h->root.root.string != NULL)
1348 {
1349 struct elf_i386_link_hash_entry *eh
1350 = (struct elf_i386_link_hash_entry *) h;
1351 tls_get_addr = eh->tls_get_addr == 1;
1352 if (eh->tls_get_addr > 1)
1353 {
1354 /* Use strncmp to check ___tls_get_addr since
1355 ___tls_get_addr may be versioned. */
1356 if (strncmp (h->root.root.string, "___tls_get_addr", 15)
1357 == 0)
1358 {
1359 eh->tls_get_addr = 1;
1360 tls_get_addr = TRUE;
1361 }
1362 else
1363 eh->tls_get_addr = 0;
1364 }
1365 }
1366
1367 if (!tls_get_addr)
1368 return FALSE;
1369 else if (indirect_call)
1370 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
1371 else
1372 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1373 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
1374
1375 case R_386_TLS_IE:
1376 /* Check transition from IE access model:
1377 movl foo@indntpoff(%rip), %eax
1378 movl foo@indntpoff(%rip), %reg
1379 addl foo@indntpoff(%rip), %reg
1380 */
1381
1382 if (offset < 1 || (offset + 4) > sec->size)
1383 return FALSE;
1384
1385 /* Check "movl foo@tpoff(%rip), %eax" first. */
1386 val = bfd_get_8 (abfd, contents + offset - 1);
1387 if (val == 0xa1)
1388 return TRUE;
1389
1390 if (offset < 2)
1391 return FALSE;
1392
1393 /* Check movl|addl foo@tpoff(%rip), %reg. */
1394 type = bfd_get_8 (abfd, contents + offset - 2);
1395 return ((type == 0x8b || type == 0x03)
1396 && (val & 0xc7) == 0x05);
1397
1398 case R_386_TLS_GOTIE:
1399 case R_386_TLS_IE_32:
1400 /* Check transition from {IE_32,GOTIE} access model:
1401 subl foo@{tpoff,gontoff}(%reg1), %reg2
1402 movl foo@{tpoff,gontoff}(%reg1), %reg2
1403 addl foo@{tpoff,gontoff}(%reg1), %reg2
1404 */
1405
1406 if (offset < 2 || (offset + 4) > sec->size)
1407 return FALSE;
1408
1409 val = bfd_get_8 (abfd, contents + offset - 1);
1410 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1411 return FALSE;
1412
1413 type = bfd_get_8 (abfd, contents + offset - 2);
1414 return type == 0x8b || type == 0x2b || type == 0x03;
1415
1416 case R_386_TLS_GOTDESC:
1417 /* Check transition from GDesc access model:
1418 leal x@tlsdesc(%ebx), %eax
1419
1420 Make sure it's a leal adding ebx to a 32-bit offset
1421 into any register, although it's probably almost always
1422 going to be eax. */
1423
1424 if (offset < 2 || (offset + 4) > sec->size)
1425 return FALSE;
1426
1427 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1428 return FALSE;
1429
1430 val = bfd_get_8 (abfd, contents + offset - 1);
1431 return (val & 0xc7) == 0x83;
1432
1433 case R_386_TLS_DESC_CALL:
1434 /* Check transition from GDesc access model:
1435 call *x@tlsdesc(%eax)
1436 */
1437 if (offset + 2 <= sec->size)
1438 {
1439 /* Make sure that it's a call *x@tlsdesc(%eax). */
1440 call = contents + offset;
1441 return call[0] == 0xff && call[1] == 0x10;
1442 }
1443
1444 return FALSE;
1445
1446 default:
1447 abort ();
1448 }
1449 }
1450
1451 /* Return TRUE if the TLS access transition is OK or no transition
1452 will be performed. Update R_TYPE if there is a transition. */
1453
1454 static bfd_boolean
1455 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1456 asection *sec, bfd_byte *contents,
1457 Elf_Internal_Shdr *symtab_hdr,
1458 struct elf_link_hash_entry **sym_hashes,
1459 unsigned int *r_type, int tls_type,
1460 const Elf_Internal_Rela *rel,
1461 const Elf_Internal_Rela *relend,
1462 struct elf_link_hash_entry *h,
1463 unsigned long r_symndx,
1464 bfd_boolean from_relocate_section)
1465 {
1466 unsigned int from_type = *r_type;
1467 unsigned int to_type = from_type;
1468 bfd_boolean check = TRUE;
1469
1470 /* Skip TLS transition for functions. */
1471 if (h != NULL
1472 && (h->type == STT_FUNC
1473 || h->type == STT_GNU_IFUNC))
1474 return TRUE;
1475
1476 switch (from_type)
1477 {
1478 case R_386_TLS_GD:
1479 case R_386_TLS_GOTDESC:
1480 case R_386_TLS_DESC_CALL:
1481 case R_386_TLS_IE_32:
1482 case R_386_TLS_IE:
1483 case R_386_TLS_GOTIE:
1484 if (bfd_link_executable (info))
1485 {
1486 if (h == NULL)
1487 to_type = R_386_TLS_LE_32;
1488 else if (from_type != R_386_TLS_IE
1489 && from_type != R_386_TLS_GOTIE)
1490 to_type = R_386_TLS_IE_32;
1491 }
1492
1493 /* When we are called from elf_i386_relocate_section, there may
1494 be additional transitions based on TLS_TYPE. */
1495 if (from_relocate_section)
1496 {
1497 unsigned int new_to_type = to_type;
1498
1499 if (bfd_link_executable (info)
1500 && h != NULL
1501 && h->dynindx == -1
1502 && (tls_type & GOT_TLS_IE))
1503 new_to_type = R_386_TLS_LE_32;
1504
1505 if (to_type == R_386_TLS_GD
1506 || to_type == R_386_TLS_GOTDESC
1507 || to_type == R_386_TLS_DESC_CALL)
1508 {
1509 if (tls_type == GOT_TLS_IE_POS)
1510 new_to_type = R_386_TLS_GOTIE;
1511 else if (tls_type & GOT_TLS_IE)
1512 new_to_type = R_386_TLS_IE_32;
1513 }
1514
1515 /* We checked the transition before when we were called from
1516 elf_i386_check_relocs. We only want to check the new
1517 transition which hasn't been checked before. */
1518 check = new_to_type != to_type && from_type == to_type;
1519 to_type = new_to_type;
1520 }
1521
1522 break;
1523
1524 case R_386_TLS_LDM:
1525 if (bfd_link_executable (info))
1526 to_type = R_386_TLS_LE_32;
1527 break;
1528
1529 default:
1530 return TRUE;
1531 }
1532
1533 /* Return TRUE if there is no transition. */
1534 if (from_type == to_type)
1535 return TRUE;
1536
1537 /* Check if the transition can be performed. */
1538 if (check
1539 && ! elf_i386_check_tls_transition (sec, contents,
1540 symtab_hdr, sym_hashes,
1541 from_type, rel, relend))
1542 {
1543 reloc_howto_type *from, *to;
1544 const char *name;
1545
1546 from = elf_i386_rtype_to_howto (abfd, from_type);
1547 to = elf_i386_rtype_to_howto (abfd, to_type);
1548
1549 if (h)
1550 name = h->root.root.string;
1551 else
1552 {
1553 struct elf_i386_link_hash_table *htab;
1554
1555 htab = elf_i386_hash_table (info);
1556 if (htab == NULL)
1557 name = "*unknown*";
1558 else
1559 {
1560 Elf_Internal_Sym *isym;
1561
1562 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1563 abfd, r_symndx);
1564 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1565 }
1566 }
1567
1568 _bfd_error_handler
1569 /* xgettext:c-format */
1570 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1571 "in section `%A' failed"),
1572 abfd, from->name, to->name, name,
1573 (unsigned long) rel->r_offset, sec);
1574 bfd_set_error (bfd_error_bad_value);
1575 return FALSE;
1576 }
1577
1578 *r_type = to_type;
1579 return TRUE;
1580 }
1581
1582 /* With the local symbol, foo, we convert
1583 mov foo@GOT[(%reg1)], %reg2
1584 to
1585 lea foo[@GOTOFF(%reg1)], %reg2
1586 and convert
1587 call/jmp *foo@GOT[(%reg)]
1588 to
1589 nop call foo/jmp foo nop
1590 When PIC is false, convert
1591 test %reg1, foo@GOT[(%reg2)]
1592 to
1593 test $foo, %reg1
1594 and convert
1595 binop foo@GOT[(%reg1)], %reg2
1596 to
1597 binop $foo, %reg2
1598 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1599 instructions. */
1600
1601 static
1602 bfd_boolean
1603 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1604 bfd_byte *contents,
1605 Elf_Internal_Rela *irel,
1606 struct elf_link_hash_entry *h,
1607 bfd_boolean *converted,
1608 struct bfd_link_info *link_info)
1609 {
1610 struct elf_i386_link_hash_table *htab;
1611 unsigned int opcode;
1612 unsigned int modrm;
1613 bfd_boolean baseless;
1614 Elf_Internal_Sym *isym;
1615 unsigned int addend;
1616 unsigned int nop;
1617 bfd_vma nop_offset;
1618 bfd_boolean is_pic;
1619 bfd_boolean to_reloc_32;
1620 unsigned int r_type;
1621 unsigned int r_symndx;
1622 bfd_vma roff = irel->r_offset;
1623
1624 if (roff < 2)
1625 return TRUE;
1626
1627 /* Addend for R_386_GOT32X relocations must be 0. */
1628 addend = bfd_get_32 (abfd, contents + roff);
1629 if (addend != 0)
1630 return TRUE;
1631
1632 htab = elf_i386_hash_table (link_info);
1633 is_pic = bfd_link_pic (link_info);
1634
1635 r_type = ELF32_R_TYPE (irel->r_info);
1636 r_symndx = ELF32_R_SYM (irel->r_info);
1637
1638 modrm = bfd_get_8 (abfd, contents + roff - 1);
1639 baseless = (modrm & 0xc7) == 0x5;
1640
1641 if (baseless && is_pic)
1642 {
1643 /* For PIC, disallow R_386_GOT32X without a base register
1644 since we don't know what the GOT base is. */
1645 const char *name;
1646
1647 if (h == NULL)
1648 {
1649 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1650 r_symndx);
1651 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1652 }
1653 else
1654 name = h->root.root.string;
1655
1656 _bfd_error_handler
1657 /* xgettext:c-format */
1658 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1659 " register can not be used when making a shared object"),
1660 abfd, name);
1661 return FALSE;
1662 }
1663
1664 opcode = bfd_get_8 (abfd, contents + roff - 2);
1665
1666 /* Convert to R_386_32 if PIC is false or there is no base
1667 register. */
1668 to_reloc_32 = !is_pic || baseless;
1669
1670 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1671 reloc. */
1672 if (h == NULL)
1673 {
1674 if (opcode == 0x0ff)
1675 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1676 goto convert_branch;
1677 else
1678 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1679 "test %reg1, foo@GOT(%reg2)" and
1680 "binop foo@GOT[(%reg1)], %reg2". */
1681 goto convert_load;
1682 }
1683
1684 /* Undefined weak symbol is only bound locally in executable
1685 and its reference is resolved as 0. */
1686 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
1687 elf_i386_hash_entry (h)))
1688 {
1689 if (opcode == 0xff)
1690 {
1691 /* No direct branch to 0 for PIC. */
1692 if (is_pic)
1693 return TRUE;
1694 else
1695 goto convert_branch;
1696 }
1697 else
1698 {
1699 /* We can convert load of address 0 to R_386_32. */
1700 to_reloc_32 = TRUE;
1701 goto convert_load;
1702 }
1703 }
1704
1705 if (opcode == 0xff)
1706 {
1707 /* We have "call/jmp *foo@GOT[(%reg)]". */
1708 if ((h->root.type == bfd_link_hash_defined
1709 || h->root.type == bfd_link_hash_defweak)
1710 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1711 {
1712 /* The function is locally defined. */
1713 convert_branch:
1714 /* Convert R_386_GOT32X to R_386_PC32. */
1715 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1716 {
1717 struct elf_i386_link_hash_entry *eh
1718 = (struct elf_i386_link_hash_entry *) h;
1719
1720 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1721 is a nop prefix. */
1722 modrm = 0xe8;
1723 /* To support TLS optimization, always use addr32 prefix
1724 for "call *___tls_get_addr@GOT(%reg)". */
1725 if (eh && eh->tls_get_addr == 1)
1726 {
1727 nop = 0x67;
1728 nop_offset = irel->r_offset - 2;
1729 }
1730 else
1731 {
1732 nop = link_info->call_nop_byte;
1733 if (link_info->call_nop_as_suffix)
1734 {
1735 nop_offset = roff + 3;
1736 irel->r_offset -= 1;
1737 }
1738 else
1739 nop_offset = roff - 2;
1740 }
1741 }
1742 else
1743 {
1744 /* Convert to "jmp foo nop". */
1745 modrm = 0xe9;
1746 nop = NOP_OPCODE;
1747 nop_offset = roff + 3;
1748 irel->r_offset -= 1;
1749 }
1750
1751 bfd_put_8 (abfd, nop, contents + nop_offset);
1752 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1753 /* When converting to PC-relative relocation, we
1754 need to adjust addend by -4. */
1755 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1756 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1757
1758 *converted = TRUE;
1759 }
1760 }
1761 else
1762 {
1763 /* We have "mov foo@GOT[(%re1g)], %reg2",
1764 "test %reg1, foo@GOT(%reg2)" and
1765 "binop foo@GOT[(%reg1)], %reg2".
1766
1767 Avoid optimizing _DYNAMIC since ld.so may use its
1768 link-time address. */
1769 if (h == htab->elf.hdynamic)
1770 return TRUE;
1771
1772 /* def_regular is set by an assignment in a linker script in
1773 bfd_elf_record_link_assignment. */
1774 if ((h->def_regular
1775 || h->root.type == bfd_link_hash_defined
1776 || h->root.type == bfd_link_hash_defweak)
1777 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1778 {
1779 convert_load:
1780 if (opcode == 0x8b)
1781 {
1782 if (to_reloc_32)
1783 {
1784 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1785 "mov $foo, %reg2" with R_386_32. */
1786 r_type = R_386_32;
1787 modrm = 0xc0 | (modrm & 0x38) >> 3;
1788 bfd_put_8 (abfd, modrm, contents + roff - 1);
1789 opcode = 0xc7;
1790 }
1791 else
1792 {
1793 /* Convert "mov foo@GOT(%reg1), %reg2" to
1794 "lea foo@GOTOFF(%reg1), %reg2". */
1795 r_type = R_386_GOTOFF;
1796 opcode = 0x8d;
1797 }
1798 }
1799 else
1800 {
1801 /* Only R_386_32 is supported. */
1802 if (!to_reloc_32)
1803 return TRUE;
1804
1805 if (opcode == 0x85)
1806 {
1807 /* Convert "test %reg1, foo@GOT(%reg2)" to
1808 "test $foo, %reg1". */
1809 modrm = 0xc0 | (modrm & 0x38) >> 3;
1810 opcode = 0xf7;
1811 }
1812 else
1813 {
1814 /* Convert "binop foo@GOT(%reg1), %reg2" to
1815 "binop $foo, %reg2". */
1816 modrm = (0xc0
1817 | (modrm & 0x38) >> 3
1818 | (opcode & 0x3c));
1819 opcode = 0x81;
1820 }
1821 bfd_put_8 (abfd, modrm, contents + roff - 1);
1822 r_type = R_386_32;
1823 }
1824
1825 bfd_put_8 (abfd, opcode, contents + roff - 2);
1826 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1827
1828 *converted = TRUE;
1829 }
1830 }
1831
1832 return TRUE;
1833 }
1834
1835 /* Rename some of the generic section flags to better document how they
1836 are used here. */
1837 #define need_convert_load sec_flg0
1838 #define check_relocs_failed sec_flg1
1839
1840 /* Look through the relocs for a section during the first phase, and
1841 calculate needed space in the global offset table, procedure linkage
1842 table, and dynamic reloc sections. */
1843
1844 static bfd_boolean
1845 elf_i386_check_relocs (bfd *abfd,
1846 struct bfd_link_info *info,
1847 asection *sec,
1848 const Elf_Internal_Rela *relocs)
1849 {
1850 struct elf_i386_link_hash_table *htab;
1851 Elf_Internal_Shdr *symtab_hdr;
1852 struct elf_link_hash_entry **sym_hashes;
1853 const Elf_Internal_Rela *rel;
1854 const Elf_Internal_Rela *rel_end;
1855 asection *sreloc;
1856 bfd_byte *contents;
1857 bfd_boolean use_plt_got;
1858
1859 if (bfd_link_relocatable (info))
1860 return TRUE;
1861
1862 /* Don't do anything special with non-loaded, non-alloced sections.
1863 In particular, any relocs in such sections should not affect GOT
1864 and PLT reference counting (ie. we don't allow them to create GOT
1865 or PLT entries), there's no possibility or desire to optimize TLS
1866 relocs, and there's not much point in propagating relocs to shared
1867 libs that the dynamic linker won't relocate. */
1868 if ((sec->flags & SEC_ALLOC) == 0)
1869 return TRUE;
1870
1871 BFD_ASSERT (is_i386_elf (abfd));
1872
1873 htab = elf_i386_hash_table (info);
1874 if (htab == NULL)
1875 {
1876 sec->check_relocs_failed = 1;
1877 return FALSE;
1878 }
1879
1880 /* Get the section contents. */
1881 if (elf_section_data (sec)->this_hdr.contents != NULL)
1882 contents = elf_section_data (sec)->this_hdr.contents;
1883 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1884 {
1885 sec->check_relocs_failed = 1;
1886 return FALSE;
1887 }
1888
1889 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1890 && (get_elf_i386_backend_data (abfd)
1891 == &elf_i386_arch_bed));
1892
1893 symtab_hdr = &elf_symtab_hdr (abfd);
1894 sym_hashes = elf_sym_hashes (abfd);
1895
1896 sreloc = NULL;
1897
1898 rel_end = relocs + sec->reloc_count;
1899 for (rel = relocs; rel < rel_end; rel++)
1900 {
1901 unsigned int r_type;
1902 unsigned long r_symndx;
1903 struct elf_link_hash_entry *h;
1904 struct elf_i386_link_hash_entry *eh;
1905 Elf_Internal_Sym *isym;
1906 const char *name;
1907 bfd_boolean size_reloc;
1908
1909 r_symndx = ELF32_R_SYM (rel->r_info);
1910 r_type = ELF32_R_TYPE (rel->r_info);
1911
1912 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1913 {
1914 /* xgettext:c-format */
1915 _bfd_error_handler (_("%B: bad symbol index: %d"),
1916 abfd, r_symndx);
1917 goto error_return;
1918 }
1919
1920 if (r_symndx < symtab_hdr->sh_info)
1921 {
1922 /* A local symbol. */
1923 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1924 abfd, r_symndx);
1925 if (isym == NULL)
1926 goto error_return;
1927
1928 /* Check relocation against local STT_GNU_IFUNC symbol. */
1929 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1930 {
1931 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1932 if (h == NULL)
1933 goto error_return;
1934
1935 /* Fake a STT_GNU_IFUNC symbol. */
1936 h->type = STT_GNU_IFUNC;
1937 h->def_regular = 1;
1938 h->ref_regular = 1;
1939 h->forced_local = 1;
1940 h->root.type = bfd_link_hash_defined;
1941 }
1942 else
1943 h = NULL;
1944 }
1945 else
1946 {
1947 isym = NULL;
1948 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1949 while (h->root.type == bfd_link_hash_indirect
1950 || h->root.type == bfd_link_hash_warning)
1951 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1952 }
1953
1954 eh = (struct elf_i386_link_hash_entry *) h;
1955 if (h != NULL)
1956 {
1957 switch (r_type)
1958 {
1959 default:
1960 break;
1961
1962 case R_386_GOTOFF:
1963 eh->gotoff_ref = 1;
1964 /* Fall through. */
1965 case R_386_32:
1966 case R_386_PC32:
1967 case R_386_PLT32:
1968 case R_386_GOT32:
1969 case R_386_GOT32X:
1970 if (htab->elf.dynobj == NULL)
1971 htab->elf.dynobj = abfd;
1972 /* Create the ifunc sections for static executables. */
1973 if (h->type == STT_GNU_IFUNC
1974 && !_bfd_elf_create_ifunc_sections (htab->elf.dynobj,
1975 info))
1976 goto error_return;
1977 break;
1978 }
1979
1980 /* It is referenced by a non-shared object. */
1981 h->ref_regular = 1;
1982 h->root.non_ir_ref = 1;
1983
1984 if (h->type == STT_GNU_IFUNC)
1985 elf_tdata (info->output_bfd)->has_gnu_symbols
1986 |= elf_gnu_symbol_ifunc;
1987 }
1988
1989 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1990 symtab_hdr, sym_hashes,
1991 &r_type, GOT_UNKNOWN,
1992 rel, rel_end, h, r_symndx, FALSE))
1993 goto error_return;
1994
1995 switch (r_type)
1996 {
1997 case R_386_TLS_LDM:
1998 htab->tls_ldm_got.refcount += 1;
1999 goto create_got;
2000
2001 case R_386_PLT32:
2002 /* This symbol requires a procedure linkage table entry. We
2003 actually build the entry in adjust_dynamic_symbol,
2004 because this might be a case of linking PIC code which is
2005 never referenced by a dynamic object, in which case we
2006 don't need to generate a procedure linkage table entry
2007 after all. */
2008
2009 /* If this is a local symbol, we resolve it directly without
2010 creating a procedure linkage table entry. */
2011 if (h == NULL)
2012 continue;
2013
2014 eh->has_got_reloc = 1;
2015 h->needs_plt = 1;
2016 h->plt.refcount += 1;
2017 break;
2018
2019 case R_386_SIZE32:
2020 size_reloc = TRUE;
2021 goto do_size;
2022
2023 case R_386_TLS_IE_32:
2024 case R_386_TLS_IE:
2025 case R_386_TLS_GOTIE:
2026 if (!bfd_link_executable (info))
2027 info->flags |= DF_STATIC_TLS;
2028 /* Fall through */
2029
2030 case R_386_GOT32:
2031 case R_386_GOT32X:
2032 case R_386_TLS_GD:
2033 case R_386_TLS_GOTDESC:
2034 case R_386_TLS_DESC_CALL:
2035 /* This symbol requires a global offset table entry. */
2036 {
2037 int tls_type, old_tls_type;
2038
2039 switch (r_type)
2040 {
2041 default:
2042 case R_386_GOT32:
2043 case R_386_GOT32X:
2044 tls_type = GOT_NORMAL;
2045 break;
2046 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
2047 case R_386_TLS_GOTDESC:
2048 case R_386_TLS_DESC_CALL:
2049 tls_type = GOT_TLS_GDESC; break;
2050 case R_386_TLS_IE_32:
2051 if (ELF32_R_TYPE (rel->r_info) == r_type)
2052 tls_type = GOT_TLS_IE_NEG;
2053 else
2054 /* If this is a GD->IE transition, we may use either of
2055 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2056 tls_type = GOT_TLS_IE;
2057 break;
2058 case R_386_TLS_IE:
2059 case R_386_TLS_GOTIE:
2060 tls_type = GOT_TLS_IE_POS; break;
2061 }
2062
2063 if (h != NULL)
2064 {
2065 h->got.refcount += 1;
2066 old_tls_type = elf_i386_hash_entry(h)->tls_type;
2067 }
2068 else
2069 {
2070 bfd_signed_vma *local_got_refcounts;
2071
2072 /* This is a global offset table entry for a local symbol. */
2073 local_got_refcounts = elf_local_got_refcounts (abfd);
2074 if (local_got_refcounts == NULL)
2075 {
2076 bfd_size_type size;
2077
2078 size = symtab_hdr->sh_info;
2079 size *= (sizeof (bfd_signed_vma)
2080 + sizeof (bfd_vma) + sizeof(char));
2081 local_got_refcounts = (bfd_signed_vma *)
2082 bfd_zalloc (abfd, size);
2083 if (local_got_refcounts == NULL)
2084 goto error_return;
2085 elf_local_got_refcounts (abfd) = local_got_refcounts;
2086 elf_i386_local_tlsdesc_gotent (abfd)
2087 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2088 elf_i386_local_got_tls_type (abfd)
2089 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2090 }
2091 local_got_refcounts[r_symndx] += 1;
2092 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
2093 }
2094
2095 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
2096 tls_type |= old_tls_type;
2097 /* If a TLS symbol is accessed using IE at least once,
2098 there is no point to use dynamic model for it. */
2099 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2100 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2101 || (tls_type & GOT_TLS_IE) == 0))
2102 {
2103 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
2104 tls_type = old_tls_type;
2105 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2106 && GOT_TLS_GD_ANY_P (tls_type))
2107 tls_type |= old_tls_type;
2108 else
2109 {
2110 if (h)
2111 name = h->root.root.string;
2112 else
2113 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2114 NULL);
2115 _bfd_error_handler
2116 /* xgettext:c-format */
2117 (_("%B: `%s' accessed both as normal and "
2118 "thread local symbol"),
2119 abfd, name);
2120 bfd_set_error (bfd_error_bad_value);
2121 goto error_return;
2122 }
2123 }
2124
2125 if (old_tls_type != tls_type)
2126 {
2127 if (h != NULL)
2128 elf_i386_hash_entry (h)->tls_type = tls_type;
2129 else
2130 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
2131 }
2132 }
2133 /* Fall through */
2134
2135 case R_386_GOTOFF:
2136 case R_386_GOTPC:
2137 create_got:
2138 if (htab->elf.sgot == NULL)
2139 {
2140 if (htab->elf.dynobj == NULL)
2141 htab->elf.dynobj = abfd;
2142 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
2143 goto error_return;
2144 }
2145 if (r_type != R_386_TLS_IE)
2146 {
2147 if (eh != NULL)
2148 eh->has_got_reloc = 1;
2149 break;
2150 }
2151 /* Fall through */
2152
2153 case R_386_TLS_LE_32:
2154 case R_386_TLS_LE:
2155 if (eh != NULL)
2156 eh->has_got_reloc = 1;
2157 if (bfd_link_executable (info))
2158 break;
2159 info->flags |= DF_STATIC_TLS;
2160 goto do_relocation;
2161
2162 case R_386_32:
2163 case R_386_PC32:
2164 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2165 eh->has_non_got_reloc = 1;
2166 do_relocation:
2167 /* We are called after all symbols have been resolved. Only
2168 relocation against STT_GNU_IFUNC symbol must go through
2169 PLT. */
2170 if (h != NULL
2171 && (bfd_link_executable (info)
2172 || h->type == STT_GNU_IFUNC))
2173 {
2174 /* If this reloc is in a read-only section, we might
2175 need a copy reloc. We can't check reliably at this
2176 stage whether the section is read-only, as input
2177 sections have not yet been mapped to output sections.
2178 Tentatively set the flag for now, and correct in
2179 adjust_dynamic_symbol. */
2180 h->non_got_ref = 1;
2181
2182 /* We may need a .plt entry if the symbol is a function
2183 defined in a shared lib or is a STT_GNU_IFUNC function
2184 referenced from the code or read-only section. */
2185 if (!h->def_regular
2186 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2187 h->plt.refcount += 1;
2188
2189 if (r_type == R_386_PC32)
2190 {
2191 /* Since something like ".long foo - ." may be used
2192 as pointer, make sure that PLT is used if foo is
2193 a function defined in a shared library. */
2194 if ((sec->flags & SEC_CODE) == 0)
2195 h->pointer_equality_needed = 1;
2196 else if (h->type == STT_GNU_IFUNC
2197 && bfd_link_pic (info))
2198 {
2199 if (isym == NULL)
2200 name = h->root.root.string;
2201 else
2202 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2203 NULL);
2204 _bfd_error_handler
2205 /* xgettext:c-format */
2206 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
2207 abfd, name);
2208 bfd_set_error (bfd_error_bad_value);
2209 goto error_return;
2210 }
2211 }
2212 else
2213 {
2214 h->pointer_equality_needed = 1;
2215 /* R_386_32 can be resolved at run-time. */
2216 if (r_type == R_386_32
2217 && (sec->flags & SEC_READONLY) == 0)
2218 eh->func_pointer_refcount += 1;
2219 }
2220 }
2221
2222 size_reloc = FALSE;
2223 do_size:
2224 /* If we are creating a shared library, and this is a reloc
2225 against a global symbol, or a non PC relative reloc
2226 against a local symbol, then we need to copy the reloc
2227 into the shared library. However, if we are linking with
2228 -Bsymbolic, we do not need to copy a reloc against a
2229 global symbol which is defined in an object we are
2230 including in the link (i.e., DEF_REGULAR is set). At
2231 this point we have not seen all the input files, so it is
2232 possible that DEF_REGULAR is not set now but will be set
2233 later (it is never cleared). In case of a weak definition,
2234 DEF_REGULAR may be cleared later by a strong definition in
2235 a shared library. We account for that possibility below by
2236 storing information in the relocs_copied field of the hash
2237 table entry. A similar situation occurs when creating
2238 shared libraries and symbol visibility changes render the
2239 symbol local.
2240
2241 If on the other hand, we are creating an executable, we
2242 may need to keep relocations for symbols satisfied by a
2243 dynamic library if we manage to avoid copy relocs for the
2244 symbol.
2245
2246 Generate dynamic pointer relocation against STT_GNU_IFUNC
2247 symbol in the non-code section. */
2248 if ((bfd_link_pic (info)
2249 && (r_type != R_386_PC32
2250 || (h != NULL
2251 && (! (bfd_link_pie (info)
2252 || SYMBOLIC_BIND (info, h))
2253 || h->root.type == bfd_link_hash_defweak
2254 || !h->def_regular))))
2255 || (h != NULL
2256 && h->type == STT_GNU_IFUNC
2257 && r_type == R_386_32
2258 && (sec->flags & SEC_CODE) == 0)
2259 || (ELIMINATE_COPY_RELOCS
2260 && !bfd_link_pic (info)
2261 && h != NULL
2262 && (h->root.type == bfd_link_hash_defweak
2263 || !h->def_regular)))
2264 {
2265 struct elf_dyn_relocs *p;
2266 struct elf_dyn_relocs **head;
2267
2268 /* We must copy these reloc types into the output file.
2269 Create a reloc section in dynobj and make room for
2270 this reloc. */
2271 if (sreloc == NULL)
2272 {
2273 if (htab->elf.dynobj == NULL)
2274 htab->elf.dynobj = abfd;
2275
2276 sreloc = _bfd_elf_make_dynamic_reloc_section
2277 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
2278
2279 if (sreloc == NULL)
2280 goto error_return;
2281 }
2282
2283 /* If this is a global symbol, we count the number of
2284 relocations we need for this symbol. */
2285 if (h != NULL)
2286 {
2287 head = &eh->dyn_relocs;
2288 }
2289 else
2290 {
2291 /* Track dynamic relocs needed for local syms too.
2292 We really need local syms available to do this
2293 easily. Oh well. */
2294 void **vpp;
2295 asection *s;
2296
2297 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2298 abfd, r_symndx);
2299 if (isym == NULL)
2300 goto error_return;
2301
2302 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2303 if (s == NULL)
2304 s = sec;
2305
2306 vpp = &elf_section_data (s)->local_dynrel;
2307 head = (struct elf_dyn_relocs **)vpp;
2308 }
2309
2310 p = *head;
2311 if (p == NULL || p->sec != sec)
2312 {
2313 bfd_size_type amt = sizeof *p;
2314 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
2315 amt);
2316 if (p == NULL)
2317 goto error_return;
2318 p->next = *head;
2319 *head = p;
2320 p->sec = sec;
2321 p->count = 0;
2322 p->pc_count = 0;
2323 }
2324
2325 p->count += 1;
2326 /* Count size relocation as PC-relative relocation. */
2327 if (r_type == R_386_PC32 || size_reloc)
2328 p->pc_count += 1;
2329 }
2330 break;
2331
2332 /* This relocation describes the C++ object vtable hierarchy.
2333 Reconstruct it for later use during GC. */
2334 case R_386_GNU_VTINHERIT:
2335 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2336 goto error_return;
2337 break;
2338
2339 /* This relocation describes which C++ vtable entries are actually
2340 used. Record for later use during GC. */
2341 case R_386_GNU_VTENTRY:
2342 BFD_ASSERT (h != NULL);
2343 if (h != NULL
2344 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
2345 goto error_return;
2346 break;
2347
2348 default:
2349 break;
2350 }
2351
2352 if (use_plt_got
2353 && h != NULL
2354 && h->plt.refcount > 0
2355 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2356 || h->got.refcount > 0)
2357 && htab->plt_got == NULL)
2358 {
2359 /* Create the GOT procedure linkage table. */
2360 unsigned int plt_got_align;
2361 const struct elf_backend_data *bed;
2362
2363 bed = get_elf_backend_data (info->output_bfd);
2364 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
2365 && (sizeof (elf_i386_got_plt_entry)
2366 == sizeof (elf_i386_pic_got_plt_entry)));
2367 plt_got_align = 3;
2368
2369 if (htab->elf.dynobj == NULL)
2370 htab->elf.dynobj = abfd;
2371 htab->plt_got
2372 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2373 ".plt.got",
2374 (bed->dynamic_sec_flags
2375 | SEC_ALLOC
2376 | SEC_CODE
2377 | SEC_LOAD
2378 | SEC_READONLY));
2379 if (htab->plt_got == NULL
2380 || !bfd_set_section_alignment (htab->elf.dynobj,
2381 htab->plt_got,
2382 plt_got_align))
2383 goto error_return;
2384
2385 if (!info->no_ld_generated_unwind_info
2386 && htab->plt_got_eh_frame == NULL
2387 && get_elf_i386_backend_data (abfd)->plt->eh_frame_plt_got != NULL)
2388 {
2389 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
2390 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
2391 | SEC_LINKER_CREATED);
2392 htab->plt_got_eh_frame
2393 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
2394 ".eh_frame",
2395 flags);
2396 if (htab->plt_got_eh_frame == NULL
2397 || !bfd_set_section_alignment (htab->elf.dynobj,
2398 htab->plt_got_eh_frame,
2399 2))
2400 goto error_return;
2401 }
2402 }
2403
2404 if (r_type == R_386_GOT32X
2405 && (h == NULL || h->type != STT_GNU_IFUNC))
2406 sec->need_convert_load = 1;
2407 }
2408
2409 if (elf_section_data (sec)->this_hdr.contents != contents)
2410 {
2411 if (!info->keep_memory)
2412 free (contents);
2413 else
2414 {
2415 /* Cache the section contents for elf_link_input_bfd. */
2416 elf_section_data (sec)->this_hdr.contents = contents;
2417 }
2418 }
2419
2420 return TRUE;
2421
2422 error_return:
2423 if (elf_section_data (sec)->this_hdr.contents != contents)
2424 free (contents);
2425 sec->check_relocs_failed = 1;
2426 return FALSE;
2427 }
2428
2429 /* Return the section that should be marked against GC for a given
2430 relocation. */
2431
2432 static asection *
2433 elf_i386_gc_mark_hook (asection *sec,
2434 struct bfd_link_info *info,
2435 Elf_Internal_Rela *rel,
2436 struct elf_link_hash_entry *h,
2437 Elf_Internal_Sym *sym)
2438 {
2439 if (h != NULL)
2440 switch (ELF32_R_TYPE (rel->r_info))
2441 {
2442 case R_386_GNU_VTINHERIT:
2443 case R_386_GNU_VTENTRY:
2444 return NULL;
2445 }
2446
2447 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2448 }
2449
2450 /* Remove undefined weak symbol from the dynamic symbol table if it
2451 is resolved to 0. */
2452
2453 static bfd_boolean
2454 elf_i386_fixup_symbol (struct bfd_link_info *info,
2455 struct elf_link_hash_entry *h)
2456 {
2457 if (h->dynindx != -1
2458 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2459 elf_i386_hash_entry (h)->has_got_reloc,
2460 elf_i386_hash_entry (h)))
2461 {
2462 h->dynindx = -1;
2463 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2464 h->dynstr_index);
2465 }
2466 return TRUE;
2467 }
2468
2469 /* Adjust a symbol defined by a dynamic object and referenced by a
2470 regular object. The current definition is in some section of the
2471 dynamic object, but we're not including those sections. We have to
2472 change the definition to something the rest of the link can
2473 understand. */
2474
2475 static bfd_boolean
2476 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2477 struct elf_link_hash_entry *h)
2478 {
2479 struct elf_i386_link_hash_table *htab;
2480 asection *s, *srel;
2481 struct elf_i386_link_hash_entry *eh;
2482 struct elf_dyn_relocs *p;
2483
2484 /* STT_GNU_IFUNC symbol must go through PLT. */
2485 if (h->type == STT_GNU_IFUNC)
2486 {
2487 /* All local STT_GNU_IFUNC references must be treate as local
2488 calls via local PLT. */
2489 if (h->ref_regular
2490 && SYMBOL_CALLS_LOCAL (info, h))
2491 {
2492 bfd_size_type pc_count = 0, count = 0;
2493 struct elf_dyn_relocs **pp;
2494
2495 eh = (struct elf_i386_link_hash_entry *) h;
2496 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2497 {
2498 pc_count += p->pc_count;
2499 p->count -= p->pc_count;
2500 p->pc_count = 0;
2501 count += p->count;
2502 if (p->count == 0)
2503 *pp = p->next;
2504 else
2505 pp = &p->next;
2506 }
2507
2508 if (pc_count || count)
2509 {
2510 h->non_got_ref = 1;
2511 if (pc_count)
2512 {
2513 /* Increment PLT reference count only for PC-relative
2514 references. */
2515 h->needs_plt = 1;
2516 if (h->plt.refcount <= 0)
2517 h->plt.refcount = 1;
2518 else
2519 h->plt.refcount += 1;
2520 }
2521 }
2522 }
2523
2524 if (h->plt.refcount <= 0)
2525 {
2526 h->plt.offset = (bfd_vma) -1;
2527 h->needs_plt = 0;
2528 }
2529 return TRUE;
2530 }
2531
2532 /* If this is a function, put it in the procedure linkage table. We
2533 will fill in the contents of the procedure linkage table later,
2534 when we know the address of the .got section. */
2535 if (h->type == STT_FUNC
2536 || h->needs_plt)
2537 {
2538 if (h->plt.refcount <= 0
2539 || SYMBOL_CALLS_LOCAL (info, h)
2540 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2541 && h->root.type == bfd_link_hash_undefweak))
2542 {
2543 /* This case can occur if we saw a PLT32 reloc in an input
2544 file, but the symbol was never referred to by a dynamic
2545 object, or if all references were garbage collected. In
2546 such a case, we don't actually need to build a procedure
2547 linkage table, and we can just do a PC32 reloc instead. */
2548 h->plt.offset = (bfd_vma) -1;
2549 h->needs_plt = 0;
2550 }
2551
2552 return TRUE;
2553 }
2554 else
2555 /* It's possible that we incorrectly decided a .plt reloc was
2556 needed for an R_386_PC32 reloc to a non-function sym in
2557 check_relocs. We can't decide accurately between function and
2558 non-function syms in check-relocs; Objects loaded later in
2559 the link may change h->type. So fix it now. */
2560 h->plt.offset = (bfd_vma) -1;
2561
2562 /* If this is a weak symbol, and there is a real definition, the
2563 processor independent code will have arranged for us to see the
2564 real definition first, and we can just use the same value. */
2565 if (h->u.weakdef != NULL)
2566 {
2567 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2568 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2569 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2570 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2571 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2572 h->non_got_ref = h->u.weakdef->non_got_ref;
2573 return TRUE;
2574 }
2575
2576 /* This is a reference to a symbol defined by a dynamic object which
2577 is not a function. */
2578
2579 /* If we are creating a shared library, we must presume that the
2580 only references to the symbol are via the global offset table.
2581 For such cases we need not do anything here; the relocations will
2582 be handled correctly by relocate_section. */
2583 if (!bfd_link_executable (info))
2584 return TRUE;
2585
2586 /* If there are no references to this symbol that do not use the
2587 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2588 reloc. */
2589 eh = (struct elf_i386_link_hash_entry *) h;
2590 if (!h->non_got_ref && !eh->gotoff_ref)
2591 return TRUE;
2592
2593 /* If -z nocopyreloc was given, we won't generate them either. */
2594 if (info->nocopyreloc)
2595 {
2596 h->non_got_ref = 0;
2597 return TRUE;
2598 }
2599
2600 htab = elf_i386_hash_table (info);
2601 if (htab == NULL)
2602 return FALSE;
2603
2604 /* If there aren't any dynamic relocs in read-only sections nor
2605 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2606 avoid the copy reloc. This doesn't work on VxWorks, where we can
2607 not have dynamic relocations (other than copy and jump slot
2608 relocations) in an executable. */
2609 if (ELIMINATE_COPY_RELOCS
2610 && !eh->gotoff_ref
2611 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2612 {
2613 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2614 {
2615 s = p->sec->output_section;
2616 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2617 break;
2618 }
2619
2620 if (p == NULL)
2621 {
2622 h->non_got_ref = 0;
2623 return TRUE;
2624 }
2625 }
2626
2627 /* We must allocate the symbol in our .dynbss section, which will
2628 become part of the .bss section of the executable. There will be
2629 an entry for this symbol in the .dynsym section. The dynamic
2630 object will contain position independent code, so all references
2631 from the dynamic object to this symbol will go through the global
2632 offset table. The dynamic linker will use the .dynsym entry to
2633 determine the address it must put in the global offset table, so
2634 both the dynamic object and the regular object will refer to the
2635 same memory location for the variable. */
2636
2637 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2638 copy the initial value out of the dynamic object and into the
2639 runtime process image. */
2640 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
2641 {
2642 s = htab->elf.sdynrelro;
2643 srel = htab->elf.sreldynrelro;
2644 }
2645 else
2646 {
2647 s = htab->elf.sdynbss;
2648 srel = htab->elf.srelbss;
2649 }
2650 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2651 {
2652 srel->size += sizeof (Elf32_External_Rel);
2653 h->needs_copy = 1;
2654 }
2655
2656 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2657 }
2658
2659 /* Allocate space in .plt, .got and associated reloc sections for
2660 dynamic relocs. */
2661
2662 static bfd_boolean
2663 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2664 {
2665 struct bfd_link_info *info;
2666 struct elf_i386_link_hash_table *htab;
2667 struct elf_i386_link_hash_entry *eh;
2668 struct elf_dyn_relocs *p;
2669 unsigned plt_entry_size;
2670 bfd_boolean resolved_to_zero;
2671
2672 if (h->root.type == bfd_link_hash_indirect)
2673 return TRUE;
2674
2675 eh = (struct elf_i386_link_hash_entry *) h;
2676
2677 info = (struct bfd_link_info *) inf;
2678 htab = elf_i386_hash_table (info);
2679 if (htab == NULL)
2680 return FALSE;
2681
2682 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2683
2684 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2685 eh->has_got_reloc,
2686 eh);
2687
2688 /* Clear the reference count of function pointer relocations if
2689 symbol isn't a normal function. */
2690 if (h->type != STT_FUNC)
2691 eh->func_pointer_refcount = 0;
2692
2693 /* We can't use the GOT PLT if pointer equality is needed since
2694 finish_dynamic_symbol won't clear symbol value and the dynamic
2695 linker won't update the GOT slot. We will get into an infinite
2696 loop at run-time. */
2697 if (htab->plt_got != NULL
2698 && h->type != STT_GNU_IFUNC
2699 && !h->pointer_equality_needed
2700 && h->plt.refcount > 0
2701 && h->got.refcount > 0)
2702 {
2703 /* Don't use the regular PLT if there are both GOT and GOTPLT
2704 reloctions. */
2705 h->plt.offset = (bfd_vma) -1;
2706
2707 /* Use the GOT PLT. */
2708 eh->plt_got.refcount = 1;
2709 }
2710
2711 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2712 here if it is defined and referenced in a non-shared object. */
2713 if (h->type == STT_GNU_IFUNC
2714 && h->def_regular)
2715 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2716 &htab->readonly_dynrelocs_against_ifunc,
2717 plt_entry_size,
2718 plt_entry_size, 4, TRUE);
2719 /* Don't create the PLT entry if there are only function pointer
2720 relocations which can be resolved at run-time. */
2721 else if (htab->elf.dynamic_sections_created
2722 && (h->plt.refcount > eh->func_pointer_refcount
2723 || eh->plt_got.refcount > 0))
2724 {
2725 bfd_boolean use_plt_got;
2726
2727 /* Clear the reference count of function pointer relocations
2728 if PLT is used. */
2729 eh->func_pointer_refcount = 0;
2730
2731 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2732 {
2733 /* Don't use the regular PLT for DF_BIND_NOW. */
2734 h->plt.offset = (bfd_vma) -1;
2735
2736 /* Use the GOT PLT. */
2737 h->got.refcount = 1;
2738 eh->plt_got.refcount = 1;
2739 }
2740
2741 use_plt_got = eh->plt_got.refcount > 0;
2742
2743 /* Make sure this symbol is output as a dynamic symbol.
2744 Undefined weak syms won't yet be marked as dynamic. */
2745 if (h->dynindx == -1
2746 && !h->forced_local
2747 && !resolved_to_zero)
2748 {
2749 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2750 return FALSE;
2751 }
2752
2753 if (bfd_link_pic (info)
2754 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2755 {
2756 asection *s = htab->elf.splt;
2757 asection *got_s = htab->plt_got;
2758
2759 /* If this is the first .plt entry, make room for the special
2760 first entry. The .plt section is used by prelink to undo
2761 prelinking for dynamic relocations. */
2762 if (s->size == 0)
2763 s->size = plt_entry_size;
2764
2765 if (use_plt_got)
2766 eh->plt_got.offset = got_s->size;
2767 else
2768 h->plt.offset = s->size;
2769
2770 /* If this symbol is not defined in a regular file, and we are
2771 not generating a shared library, then set the symbol to this
2772 location in the .plt. This is required to make function
2773 pointers compare as equal between the normal executable and
2774 the shared library. */
2775 if (! bfd_link_pic (info)
2776 && !h->def_regular)
2777 {
2778 if (use_plt_got)
2779 {
2780 /* We need to make a call to the entry of the GOT PLT
2781 instead of regular PLT entry. */
2782 h->root.u.def.section = got_s;
2783 h->root.u.def.value = eh->plt_got.offset;
2784 }
2785 else
2786 {
2787 h->root.u.def.section = s;
2788 h->root.u.def.value = h->plt.offset;
2789 }
2790 }
2791
2792 /* Make room for this entry. */
2793 if (use_plt_got)
2794 got_s->size += sizeof (elf_i386_got_plt_entry);
2795 else
2796 {
2797 s->size += plt_entry_size;
2798
2799 /* We also need to make an entry in the .got.plt section,
2800 which will be placed in the .got section by the linker
2801 script. */
2802 htab->elf.sgotplt->size += 4;
2803
2804 /* There should be no PLT relocation against resolved
2805 undefined weak symbol in executable. */
2806 if (!resolved_to_zero)
2807 {
2808 /* We also need to make an entry in the .rel.plt
2809 section. */
2810 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2811 htab->elf.srelplt->reloc_count++;
2812 }
2813 }
2814
2815 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2816 && !bfd_link_pic (info))
2817 {
2818 /* VxWorks has a second set of relocations for each PLT entry
2819 in executables. They go in a separate relocation section,
2820 which is processed by the kernel loader. */
2821
2822 /* There are two relocations for the initial PLT entry: an
2823 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2824 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2825
2826 if (h->plt.offset == plt_entry_size)
2827 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2828
2829 /* There are two extra relocations for each subsequent PLT entry:
2830 an R_386_32 relocation for the GOT entry, and an R_386_32
2831 relocation for the PLT entry. */
2832
2833 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2834 }
2835 }
2836 else
2837 {
2838 eh->plt_got.offset = (bfd_vma) -1;
2839 h->plt.offset = (bfd_vma) -1;
2840 h->needs_plt = 0;
2841 }
2842 }
2843 else
2844 {
2845 eh->plt_got.offset = (bfd_vma) -1;
2846 h->plt.offset = (bfd_vma) -1;
2847 h->needs_plt = 0;
2848 }
2849
2850 eh->tlsdesc_got = (bfd_vma) -1;
2851
2852 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2853 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2854 if (h->got.refcount > 0
2855 && bfd_link_executable (info)
2856 && h->dynindx == -1
2857 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2858 h->got.offset = (bfd_vma) -1;
2859 else if (h->got.refcount > 0)
2860 {
2861 asection *s;
2862 bfd_boolean dyn;
2863 int tls_type = elf_i386_hash_entry(h)->tls_type;
2864
2865 /* Make sure this symbol is output as a dynamic symbol.
2866 Undefined weak syms won't yet be marked as dynamic. */
2867 if (h->dynindx == -1
2868 && !h->forced_local
2869 && !resolved_to_zero)
2870 {
2871 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2872 return FALSE;
2873 }
2874
2875 s = htab->elf.sgot;
2876 if (GOT_TLS_GDESC_P (tls_type))
2877 {
2878 eh->tlsdesc_got = htab->elf.sgotplt->size
2879 - elf_i386_compute_jump_table_size (htab);
2880 htab->elf.sgotplt->size += 8;
2881 h->got.offset = (bfd_vma) -2;
2882 }
2883 if (! GOT_TLS_GDESC_P (tls_type)
2884 || GOT_TLS_GD_P (tls_type))
2885 {
2886 h->got.offset = s->size;
2887 s->size += 4;
2888 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2889 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2890 s->size += 4;
2891 }
2892 dyn = htab->elf.dynamic_sections_created;
2893 /* R_386_TLS_IE_32 needs one dynamic relocation,
2894 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2895 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2896 need two), R_386_TLS_GD needs one if local symbol and two if
2897 global. No dynamic relocation against resolved undefined weak
2898 symbol in executable. */
2899 if (tls_type == GOT_TLS_IE_BOTH)
2900 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2901 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2902 || (tls_type & GOT_TLS_IE))
2903 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2904 else if (GOT_TLS_GD_P (tls_type))
2905 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2906 else if (! GOT_TLS_GDESC_P (tls_type)
2907 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2908 && !resolved_to_zero)
2909 || h->root.type != bfd_link_hash_undefweak)
2910 && (bfd_link_pic (info)
2911 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2912 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2913 if (GOT_TLS_GDESC_P (tls_type))
2914 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2915 }
2916 else
2917 h->got.offset = (bfd_vma) -1;
2918
2919 if (eh->dyn_relocs == NULL)
2920 return TRUE;
2921
2922 /* In the shared -Bsymbolic case, discard space allocated for
2923 dynamic pc-relative relocs against symbols which turn out to be
2924 defined in regular objects. For the normal shared case, discard
2925 space for pc-relative relocs that have become local due to symbol
2926 visibility changes. */
2927
2928 if (bfd_link_pic (info))
2929 {
2930 /* The only reloc that uses pc_count is R_386_PC32, which will
2931 appear on a call or on something like ".long foo - .". We
2932 want calls to protected symbols to resolve directly to the
2933 function rather than going via the plt. If people want
2934 function pointer comparisons to work as expected then they
2935 should avoid writing assembly like ".long foo - .". */
2936 if (SYMBOL_CALLS_LOCAL (info, h))
2937 {
2938 struct elf_dyn_relocs **pp;
2939
2940 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2941 {
2942 p->count -= p->pc_count;
2943 p->pc_count = 0;
2944 if (p->count == 0)
2945 *pp = p->next;
2946 else
2947 pp = &p->next;
2948 }
2949 }
2950
2951 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2952 {
2953 struct elf_dyn_relocs **pp;
2954 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2955 {
2956 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2957 *pp = p->next;
2958 else
2959 pp = &p->next;
2960 }
2961 }
2962
2963 /* Also discard relocs on undefined weak syms with non-default
2964 visibility or in PIE. */
2965 if (eh->dyn_relocs != NULL
2966 && h->root.type == bfd_link_hash_undefweak)
2967 {
2968 /* Undefined weak symbol is never bound locally in shared
2969 library. */
2970 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2971 || resolved_to_zero)
2972 {
2973 if (h->non_got_ref)
2974 {
2975 /* Keep dynamic non-GOT/non-PLT relocation so that we
2976 can branch to 0 without PLT. */
2977 struct elf_dyn_relocs **pp;
2978
2979 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2980 if (p->pc_count == 0)
2981 *pp = p->next;
2982 else
2983 {
2984 /* Remove non-R_386_PC32 relocation. */
2985 p->count = p->pc_count;
2986 pp = &p->next;
2987 }
2988
2989 if (eh->dyn_relocs != NULL)
2990 {
2991 /* Make sure undefined weak symbols are output
2992 as dynamic symbols in PIEs for dynamic non-GOT
2993 non-PLT reloations. */
2994 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2995 return FALSE;
2996 }
2997 }
2998 else
2999 eh->dyn_relocs = NULL;
3000 }
3001 else if (h->dynindx == -1
3002 && !h->forced_local)
3003 {
3004 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3005 return FALSE;
3006 }
3007 }
3008 }
3009 else if (ELIMINATE_COPY_RELOCS)
3010 {
3011 /* For the non-shared case, discard space for relocs against
3012 symbols which turn out to need copy relocs or are not
3013 dynamic. Keep dynamic relocations for run-time function
3014 pointer initialization. */
3015
3016 if ((!h->non_got_ref
3017 || eh->func_pointer_refcount > 0
3018 || (h->root.type == bfd_link_hash_undefweak
3019 && !resolved_to_zero))
3020 && ((h->def_dynamic
3021 && !h->def_regular)
3022 || (htab->elf.dynamic_sections_created
3023 && (h->root.type == bfd_link_hash_undefweak
3024 || h->root.type == bfd_link_hash_undefined))))
3025 {
3026 /* Make sure this symbol is output as a dynamic symbol.
3027 Undefined weak syms won't yet be marked as dynamic. */
3028 if (h->dynindx == -1
3029 && !h->forced_local
3030 && !resolved_to_zero)
3031 {
3032 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3033 return FALSE;
3034 }
3035
3036 /* If that succeeded, we know we'll be keeping all the
3037 relocs. */
3038 if (h->dynindx != -1)
3039 goto keep;
3040 }
3041
3042 eh->dyn_relocs = NULL;
3043 eh->func_pointer_refcount = 0;
3044
3045 keep: ;
3046 }
3047
3048 /* Finally, allocate space. */
3049 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3050 {
3051 asection *sreloc;
3052
3053 sreloc = elf_section_data (p->sec)->sreloc;
3054
3055 BFD_ASSERT (sreloc != NULL);
3056 sreloc->size += p->count * sizeof (Elf32_External_Rel);
3057 }
3058
3059 return TRUE;
3060 }
3061
3062 /* Allocate space in .plt, .got and associated reloc sections for
3063 local dynamic relocs. */
3064
3065 static bfd_boolean
3066 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
3067 {
3068 struct elf_link_hash_entry *h
3069 = (struct elf_link_hash_entry *) *slot;
3070
3071 if (h->type != STT_GNU_IFUNC
3072 || !h->def_regular
3073 || !h->ref_regular
3074 || !h->forced_local
3075 || h->root.type != bfd_link_hash_defined)
3076 abort ();
3077
3078 return elf_i386_allocate_dynrelocs (h, inf);
3079 }
3080
3081 /* Find any dynamic relocs that apply to read-only sections. */
3082
3083 static bfd_boolean
3084 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
3085 {
3086 struct elf_i386_link_hash_entry *eh;
3087 struct elf_dyn_relocs *p;
3088
3089 /* Skip local IFUNC symbols. */
3090 if (h->forced_local && h->type == STT_GNU_IFUNC)
3091 return TRUE;
3092
3093 eh = (struct elf_i386_link_hash_entry *) h;
3094 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3095 {
3096 asection *s = p->sec->output_section;
3097
3098 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3099 {
3100 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3101
3102 info->flags |= DF_TEXTREL;
3103
3104 if ((info->warn_shared_textrel && bfd_link_pic (info))
3105 || info->error_textrel)
3106 /* xgettext:c-format */
3107 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3108 p->sec->owner, h->root.root.string,
3109 p->sec);
3110
3111 /* Not an error, just cut short the traversal. */
3112 return FALSE;
3113 }
3114 }
3115 return TRUE;
3116 }
3117
3118 /* Convert load via the GOT slot to load immediate. */
3119
3120 static bfd_boolean
3121 elf_i386_convert_load (bfd *abfd, asection *sec,
3122 struct bfd_link_info *link_info)
3123 {
3124 struct elf_i386_link_hash_table *htab;
3125 Elf_Internal_Shdr *symtab_hdr;
3126 Elf_Internal_Rela *internal_relocs;
3127 Elf_Internal_Rela *irel, *irelend;
3128 bfd_byte *contents;
3129 bfd_boolean changed;
3130 bfd_signed_vma *local_got_refcounts;
3131
3132 /* Don't even try to convert non-ELF outputs. */
3133 if (!is_elf_hash_table (link_info->hash))
3134 return FALSE;
3135
3136 /* Nothing to do if there is no need or no output. */
3137 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3138 || sec->need_convert_load == 0
3139 || bfd_is_abs_section (sec->output_section))
3140 return TRUE;
3141
3142 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3143
3144 /* Load the relocations for this section. */
3145 internal_relocs = (_bfd_elf_link_read_relocs
3146 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3147 link_info->keep_memory));
3148 if (internal_relocs == NULL)
3149 return FALSE;
3150
3151 changed = FALSE;
3152 htab = elf_i386_hash_table (link_info);
3153 local_got_refcounts = elf_local_got_refcounts (abfd);
3154
3155 /* Get the section contents. */
3156 if (elf_section_data (sec)->this_hdr.contents != NULL)
3157 contents = elf_section_data (sec)->this_hdr.contents;
3158 else
3159 {
3160 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3161 goto error_return;
3162 }
3163
3164 irelend = internal_relocs + sec->reloc_count;
3165 for (irel = internal_relocs; irel < irelend; irel++)
3166 {
3167 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3168 unsigned int r_symndx;
3169 struct elf_link_hash_entry *h;
3170 bfd_boolean converted;
3171
3172 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3173 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3174 if (r_type != R_386_GOT32X)
3175 continue;
3176
3177 r_symndx = ELF32_R_SYM (irel->r_info);
3178 if (r_symndx < symtab_hdr->sh_info)
3179 h = elf_i386_get_local_sym_hash (htab, sec->owner,
3180 (const Elf_Internal_Rela *) irel,
3181 FALSE);
3182 else
3183 {
3184 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3185 while (h->root.type == bfd_link_hash_indirect
3186 || h->root.type == bfd_link_hash_warning)
3187 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3188 }
3189
3190 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3191 if (h != NULL && h->type == STT_GNU_IFUNC)
3192 continue;
3193
3194 converted = FALSE;
3195 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
3196 irel, h, &converted, link_info))
3197 goto error_return;
3198
3199 if (converted)
3200 {
3201 changed = converted;
3202 if (h)
3203 {
3204 if (h->got.refcount > 0)
3205 h->got.refcount -= 1;
3206 }
3207 else
3208 {
3209 if (local_got_refcounts != NULL
3210 && local_got_refcounts[r_symndx] > 0)
3211 local_got_refcounts[r_symndx] -= 1;
3212 }
3213 }
3214 }
3215
3216 if (contents != NULL
3217 && elf_section_data (sec)->this_hdr.contents != contents)
3218 {
3219 if (!changed && !link_info->keep_memory)
3220 free (contents);
3221 else
3222 {
3223 /* Cache the section contents for elf_link_input_bfd. */
3224 elf_section_data (sec)->this_hdr.contents = contents;
3225 }
3226 }
3227
3228 if (elf_section_data (sec)->relocs != internal_relocs)
3229 {
3230 if (!changed)
3231 free (internal_relocs);
3232 else
3233 elf_section_data (sec)->relocs = internal_relocs;
3234 }
3235
3236 return TRUE;
3237
3238 error_return:
3239 if (contents != NULL
3240 && elf_section_data (sec)->this_hdr.contents != contents)
3241 free (contents);
3242 if (internal_relocs != NULL
3243 && elf_section_data (sec)->relocs != internal_relocs)
3244 free (internal_relocs);
3245 return FALSE;
3246 }
3247
3248 /* Set the sizes of the dynamic sections. */
3249
3250 static bfd_boolean
3251 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3252 {
3253 struct elf_i386_link_hash_table *htab;
3254 bfd *dynobj;
3255 asection *s;
3256 bfd_boolean relocs;
3257 bfd *ibfd;
3258
3259 htab = elf_i386_hash_table (info);
3260 if (htab == NULL)
3261 return FALSE;
3262 dynobj = htab->elf.dynobj;
3263 if (dynobj == NULL)
3264 abort ();
3265
3266 /* Set up .got offsets for local syms, and space for local dynamic
3267 relocs. */
3268 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3269 {
3270 bfd_signed_vma *local_got;
3271 bfd_signed_vma *end_local_got;
3272 char *local_tls_type;
3273 bfd_vma *local_tlsdesc_gotent;
3274 bfd_size_type locsymcount;
3275 Elf_Internal_Shdr *symtab_hdr;
3276 asection *srel;
3277
3278 if (! is_i386_elf (ibfd))
3279 continue;
3280
3281 for (s = ibfd->sections; s != NULL; s = s->next)
3282 {
3283 struct elf_dyn_relocs *p;
3284
3285 if (!elf_i386_convert_load (ibfd, s, info))
3286 return FALSE;
3287
3288 for (p = ((struct elf_dyn_relocs *)
3289 elf_section_data (s)->local_dynrel);
3290 p != NULL;
3291 p = p->next)
3292 {
3293 if (!bfd_is_abs_section (p->sec)
3294 && bfd_is_abs_section (p->sec->output_section))
3295 {
3296 /* Input section has been discarded, either because
3297 it is a copy of a linkonce section or due to
3298 linker script /DISCARD/, so we'll be discarding
3299 the relocs too. */
3300 }
3301 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3302 && strcmp (p->sec->output_section->name,
3303 ".tls_vars") == 0)
3304 {
3305 /* Relocations in vxworks .tls_vars sections are
3306 handled specially by the loader. */
3307 }
3308 else if (p->count != 0)
3309 {
3310 srel = elf_section_data (p->sec)->sreloc;
3311 srel->size += p->count * sizeof (Elf32_External_Rel);
3312 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3313 && (info->flags & DF_TEXTREL) == 0)
3314 {
3315 info->flags |= DF_TEXTREL;
3316 if ((info->warn_shared_textrel && bfd_link_pic (info))
3317 || info->error_textrel)
3318 /* xgettext:c-format */
3319 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3320 p->sec->owner, p->sec);
3321 }
3322 }
3323 }
3324 }
3325
3326 local_got = elf_local_got_refcounts (ibfd);
3327 if (!local_got)
3328 continue;
3329
3330 symtab_hdr = &elf_symtab_hdr (ibfd);
3331 locsymcount = symtab_hdr->sh_info;
3332 end_local_got = local_got + locsymcount;
3333 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3334 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3335 s = htab->elf.sgot;
3336 srel = htab->elf.srelgot;
3337 for (; local_got < end_local_got;
3338 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3339 {
3340 *local_tlsdesc_gotent = (bfd_vma) -1;
3341 if (*local_got > 0)
3342 {
3343 if (GOT_TLS_GDESC_P (*local_tls_type))
3344 {
3345 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3346 - elf_i386_compute_jump_table_size (htab);
3347 htab->elf.sgotplt->size += 8;
3348 *local_got = (bfd_vma) -2;
3349 }
3350 if (! GOT_TLS_GDESC_P (*local_tls_type)
3351 || GOT_TLS_GD_P (*local_tls_type))
3352 {
3353 *local_got = s->size;
3354 s->size += 4;
3355 if (GOT_TLS_GD_P (*local_tls_type)
3356 || *local_tls_type == GOT_TLS_IE_BOTH)
3357 s->size += 4;
3358 }
3359 if (bfd_link_pic (info)
3360 || GOT_TLS_GD_ANY_P (*local_tls_type)
3361 || (*local_tls_type & GOT_TLS_IE))
3362 {
3363 if (*local_tls_type == GOT_TLS_IE_BOTH)
3364 srel->size += 2 * sizeof (Elf32_External_Rel);
3365 else if (GOT_TLS_GD_P (*local_tls_type)
3366 || ! GOT_TLS_GDESC_P (*local_tls_type))
3367 srel->size += sizeof (Elf32_External_Rel);
3368 if (GOT_TLS_GDESC_P (*local_tls_type))
3369 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3370 }
3371 }
3372 else
3373 *local_got = (bfd_vma) -1;
3374 }
3375 }
3376
3377 if (htab->tls_ldm_got.refcount > 0)
3378 {
3379 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3380 relocs. */
3381 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3382 htab->elf.sgot->size += 8;
3383 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3384 }
3385 else
3386 htab->tls_ldm_got.offset = -1;
3387
3388 /* Allocate global sym .plt and .got entries, and space for global
3389 sym dynamic relocs. */
3390 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3391
3392 /* Allocate .plt and .got entries, and space for local symbols. */
3393 htab_traverse (htab->loc_hash_table,
3394 elf_i386_allocate_local_dynrelocs,
3395 info);
3396
3397 /* For every jump slot reserved in the sgotplt, reloc_count is
3398 incremented. However, when we reserve space for TLS descriptors,
3399 it's not incremented, so in order to compute the space reserved
3400 for them, it suffices to multiply the reloc count by the jump
3401 slot size.
3402
3403 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3404 so that R_386_IRELATIVE entries come last. */
3405 if (htab->elf.srelplt)
3406 {
3407 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3408 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3409 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3410 }
3411 else if (htab->elf.irelplt)
3412 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3413
3414
3415 if (htab->elf.sgotplt)
3416 {
3417 /* Don't allocate .got.plt section if there are no GOT nor PLT
3418 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3419 if ((htab->elf.hgot == NULL
3420 || !htab->elf.hgot->ref_regular_nonweak)
3421 && (htab->elf.sgotplt->size
3422 == get_elf_backend_data (output_bfd)->got_header_size)
3423 && (htab->elf.splt == NULL
3424 || htab->elf.splt->size == 0)
3425 && (htab->elf.sgot == NULL
3426 || htab->elf.sgot->size == 0)
3427 && (htab->elf.iplt == NULL
3428 || htab->elf.iplt->size == 0)
3429 && (htab->elf.igotplt == NULL
3430 || htab->elf.igotplt->size == 0))
3431 htab->elf.sgotplt->size = 0;
3432 }
3433
3434 if (_bfd_elf_eh_frame_present (info))
3435 {
3436 if (htab->plt_eh_frame != NULL
3437 && htab->elf.splt != NULL
3438 && htab->elf.splt->size != 0
3439 && !bfd_is_abs_section (htab->elf.splt->output_section))
3440 htab->plt_eh_frame->size
3441 = get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt_size;
3442
3443 if (htab->plt_got_eh_frame != NULL
3444 && htab->plt_got != NULL
3445 && htab->plt_got->size != 0
3446 && !bfd_is_abs_section (htab->plt_got->output_section))
3447 htab->plt_got_eh_frame->size
3448 = get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt_got_size;
3449 }
3450
3451 /* We now have determined the sizes of the various dynamic sections.
3452 Allocate memory for them. */
3453 relocs = FALSE;
3454 for (s = dynobj->sections; s != NULL; s = s->next)
3455 {
3456 bfd_boolean strip_section = TRUE;
3457
3458 if ((s->flags & SEC_LINKER_CREATED) == 0)
3459 continue;
3460
3461 if (s == htab->elf.splt
3462 || s == htab->elf.sgot)
3463 {
3464 /* Strip this section if we don't need it; see the
3465 comment below. */
3466 /* We'd like to strip these sections if they aren't needed, but if
3467 we've exported dynamic symbols from them we must leave them.
3468 It's too late to tell BFD to get rid of the symbols. */
3469
3470 if (htab->elf.hplt != NULL)
3471 strip_section = FALSE;
3472 }
3473 else if (s == htab->elf.sgotplt
3474 || s == htab->elf.iplt
3475 || s == htab->elf.igotplt
3476 || s == htab->plt_got
3477 || s == htab->plt_eh_frame
3478 || s == htab->plt_got_eh_frame
3479 || s == htab->elf.sdynbss
3480 || s == htab->elf.sdynrelro)
3481 {
3482 /* Strip these too. */
3483 }
3484 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3485 {
3486 if (s->size != 0
3487 && s != htab->elf.srelplt
3488 && s != htab->srelplt2)
3489 relocs = TRUE;
3490
3491 /* We use the reloc_count field as a counter if we need
3492 to copy relocs into the output file. */
3493 s->reloc_count = 0;
3494 }
3495 else
3496 {
3497 /* It's not one of our sections, so don't allocate space. */
3498 continue;
3499 }
3500
3501 if (s->size == 0)
3502 {
3503 /* If we don't need this section, strip it from the
3504 output file. This is mostly to handle .rel.bss and
3505 .rel.plt. We must create both sections in
3506 create_dynamic_sections, because they must be created
3507 before the linker maps input sections to output
3508 sections. The linker does that before
3509 adjust_dynamic_symbol is called, and it is that
3510 function which decides whether anything needs to go
3511 into these sections. */
3512 if (strip_section)
3513 s->flags |= SEC_EXCLUDE;
3514 continue;
3515 }
3516
3517 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3518 continue;
3519
3520 /* Allocate memory for the section contents. We use bfd_zalloc
3521 here in case unused entries are not reclaimed before the
3522 section's contents are written out. This should not happen,
3523 but this way if it does, we get a R_386_NONE reloc instead
3524 of garbage. */
3525 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3526 if (s->contents == NULL)
3527 return FALSE;
3528 }
3529
3530 if (htab->plt_eh_frame != NULL
3531 && htab->plt_eh_frame->contents != NULL)
3532 {
3533 memcpy (htab->plt_eh_frame->contents,
3534 get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt,
3535 htab->plt_eh_frame->size);
3536 bfd_put_32 (dynobj, htab->elf.splt->size,
3537 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3538 }
3539
3540 if (htab->plt_got_eh_frame != NULL
3541 && htab->plt_got_eh_frame->contents != NULL)
3542 {
3543 memcpy (htab->plt_got_eh_frame->contents,
3544 get_elf_i386_backend_data (output_bfd)->plt->eh_frame_plt_got,
3545 htab->plt_got_eh_frame->size);
3546 bfd_put_32 (dynobj, htab->plt_got->size,
3547 (htab->plt_got_eh_frame->contents
3548 + PLT_FDE_LEN_OFFSET));
3549 }
3550
3551 if (htab->elf.dynamic_sections_created)
3552 {
3553 /* Add some entries to the .dynamic section. We fill in the
3554 values later, in elf_i386_finish_dynamic_sections, but we
3555 must add the entries now so that we get the correct size for
3556 the .dynamic section. The DT_DEBUG entry is filled in by the
3557 dynamic linker and used by the debugger. */
3558 #define add_dynamic_entry(TAG, VAL) \
3559 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3560
3561 if (bfd_link_executable (info))
3562 {
3563 if (!add_dynamic_entry (DT_DEBUG, 0))
3564 return FALSE;
3565 }
3566
3567 if (htab->elf.splt->size != 0)
3568 {
3569 /* DT_PLTGOT is used by prelink even if there is no PLT
3570 relocation. */
3571 if (!add_dynamic_entry (DT_PLTGOT, 0))
3572 return FALSE;
3573
3574 if (htab->elf.srelplt->size != 0)
3575 {
3576 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3577 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3578 || !add_dynamic_entry (DT_JMPREL, 0))
3579 return FALSE;
3580 }
3581 }
3582
3583 if (relocs)
3584 {
3585 if (!add_dynamic_entry (DT_REL, 0)
3586 || !add_dynamic_entry (DT_RELSZ, 0)
3587 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3588 return FALSE;
3589
3590 /* If any dynamic relocs apply to a read-only section,
3591 then we need a DT_TEXTREL entry. */
3592 if ((info->flags & DF_TEXTREL) == 0)
3593 elf_link_hash_traverse (&htab->elf,
3594 elf_i386_readonly_dynrelocs, info);
3595
3596 if ((info->flags & DF_TEXTREL) != 0)
3597 {
3598 if (htab->readonly_dynrelocs_against_ifunc)
3599 {
3600 info->callbacks->einfo
3601 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3602 bfd_set_error (bfd_error_bad_value);
3603 return FALSE;
3604 }
3605
3606 if (!add_dynamic_entry (DT_TEXTREL, 0))
3607 return FALSE;
3608 }
3609 }
3610 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3611 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3612 return FALSE;
3613 }
3614 #undef add_dynamic_entry
3615
3616 return TRUE;
3617 }
3618
3619 static bfd_boolean
3620 elf_i386_always_size_sections (bfd *output_bfd,
3621 struct bfd_link_info *info)
3622 {
3623 asection *tls_sec = elf_hash_table (info)->tls_sec;
3624
3625 if (tls_sec)
3626 {
3627 struct elf_link_hash_entry *tlsbase;
3628
3629 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3630 "_TLS_MODULE_BASE_",
3631 FALSE, FALSE, FALSE);
3632
3633 if (tlsbase && tlsbase->type == STT_TLS)
3634 {
3635 struct elf_i386_link_hash_table *htab;
3636 struct bfd_link_hash_entry *bh = NULL;
3637 const struct elf_backend_data *bed
3638 = get_elf_backend_data (output_bfd);
3639
3640 htab = elf_i386_hash_table (info);
3641 if (htab == NULL)
3642 return FALSE;
3643
3644 if (!(_bfd_generic_link_add_one_symbol
3645 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3646 tls_sec, 0, NULL, FALSE,
3647 bed->collect, &bh)))
3648 return FALSE;
3649
3650 htab->tls_module_base = bh;
3651
3652 tlsbase = (struct elf_link_hash_entry *)bh;
3653 tlsbase->def_regular = 1;
3654 tlsbase->other = STV_HIDDEN;
3655 tlsbase->root.linker_def = 1;
3656 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3657 }
3658 }
3659
3660 return TRUE;
3661 }
3662
3663 /* Set the correct type for an x86 ELF section. We do this by the
3664 section name, which is a hack, but ought to work. */
3665
3666 static bfd_boolean
3667 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3668 Elf_Internal_Shdr *hdr,
3669 asection *sec)
3670 {
3671 const char *name;
3672
3673 name = bfd_get_section_name (abfd, sec);
3674
3675 /* This is an ugly, but unfortunately necessary hack that is
3676 needed when producing EFI binaries on x86. It tells
3677 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3678 containing ELF relocation info. We need this hack in order to
3679 be able to generate ELF binaries that can be translated into
3680 EFI applications (which are essentially COFF objects). Those
3681 files contain a COFF ".reloc" section inside an ELFNN object,
3682 which would normally cause BFD to segfault because it would
3683 attempt to interpret this section as containing relocation
3684 entries for section "oc". With this hack enabled, ".reloc"
3685 will be treated as a normal data section, which will avoid the
3686 segfault. However, you won't be able to create an ELFNN binary
3687 with a section named "oc" that needs relocations, but that's
3688 the kind of ugly side-effects you get when detecting section
3689 types based on their names... In practice, this limitation is
3690 unlikely to bite. */
3691 if (strcmp (name, ".reloc") == 0)
3692 hdr->sh_type = SHT_PROGBITS;
3693
3694 return TRUE;
3695 }
3696
3697 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3698 executables. Rather than setting it to the beginning of the TLS
3699 section, we have to set it to the end. This function may be called
3700 multiple times, it is idempotent. */
3701
3702 static void
3703 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3704 {
3705 struct elf_i386_link_hash_table *htab;
3706 struct bfd_link_hash_entry *base;
3707
3708 if (!bfd_link_executable (info))
3709 return;
3710
3711 htab = elf_i386_hash_table (info);
3712 if (htab == NULL)
3713 return;
3714
3715 base = htab->tls_module_base;
3716 if (base == NULL)
3717 return;
3718
3719 base->u.def.value = htab->elf.tls_size;
3720 }
3721
3722 /* Return the base VMA address which should be subtracted from real addresses
3723 when resolving @dtpoff relocation.
3724 This is PT_TLS segment p_vaddr. */
3725
3726 static bfd_vma
3727 elf_i386_dtpoff_base (struct bfd_link_info *info)
3728 {
3729 /* If tls_sec is NULL, we should have signalled an error already. */
3730 if (elf_hash_table (info)->tls_sec == NULL)
3731 return 0;
3732 return elf_hash_table (info)->tls_sec->vma;
3733 }
3734
3735 /* Return the relocation value for @tpoff relocation
3736 if STT_TLS virtual address is ADDRESS. */
3737
3738 static bfd_vma
3739 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3740 {
3741 struct elf_link_hash_table *htab = elf_hash_table (info);
3742 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3743 bfd_vma static_tls_size;
3744
3745 /* If tls_sec is NULL, we should have signalled an error already. */
3746 if (htab->tls_sec == NULL)
3747 return 0;
3748
3749 /* Consider special static TLS alignment requirements. */
3750 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3751 return static_tls_size + htab->tls_sec->vma - address;
3752 }
3753
3754 /* Relocate an i386 ELF section. */
3755
3756 static bfd_boolean
3757 elf_i386_relocate_section (bfd *output_bfd,
3758 struct bfd_link_info *info,
3759 bfd *input_bfd,
3760 asection *input_section,
3761 bfd_byte *contents,
3762 Elf_Internal_Rela *relocs,
3763 Elf_Internal_Sym *local_syms,
3764 asection **local_sections)
3765 {
3766 struct elf_i386_link_hash_table *htab;
3767 Elf_Internal_Shdr *symtab_hdr;
3768 struct elf_link_hash_entry **sym_hashes;
3769 bfd_vma *local_got_offsets;
3770 bfd_vma *local_tlsdesc_gotents;
3771 Elf_Internal_Rela *rel;
3772 Elf_Internal_Rela *wrel;
3773 Elf_Internal_Rela *relend;
3774 bfd_boolean is_vxworks_tls;
3775 unsigned plt_entry_size;
3776
3777 BFD_ASSERT (is_i386_elf (input_bfd));
3778
3779 /* Skip if check_relocs failed. */
3780 if (input_section->check_relocs_failed)
3781 return FALSE;
3782
3783 htab = elf_i386_hash_table (info);
3784 if (htab == NULL)
3785 return FALSE;
3786 symtab_hdr = &elf_symtab_hdr (input_bfd);
3787 sym_hashes = elf_sym_hashes (input_bfd);
3788 local_got_offsets = elf_local_got_offsets (input_bfd);
3789 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3790 /* We have to handle relocations in vxworks .tls_vars sections
3791 specially, because the dynamic loader is 'weird'. */
3792 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3793 && bfd_link_pic (info)
3794 && !strcmp (input_section->output_section->name,
3795 ".tls_vars"));
3796
3797 elf_i386_set_tls_module_base (info);
3798
3799 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3800
3801 rel = wrel = relocs;
3802 relend = relocs + input_section->reloc_count;
3803 for (; rel < relend; wrel++, rel++)
3804 {
3805 unsigned int r_type;
3806 reloc_howto_type *howto;
3807 unsigned long r_symndx;
3808 struct elf_link_hash_entry *h;
3809 struct elf_i386_link_hash_entry *eh;
3810 Elf_Internal_Sym *sym;
3811 asection *sec;
3812 bfd_vma off, offplt, plt_offset;
3813 bfd_vma relocation;
3814 bfd_boolean unresolved_reloc;
3815 bfd_reloc_status_type r;
3816 unsigned int indx;
3817 int tls_type;
3818 bfd_vma st_size;
3819 asection *resolved_plt;
3820 bfd_boolean resolved_to_zero;
3821
3822 r_type = ELF32_R_TYPE (rel->r_info);
3823 if (r_type == R_386_GNU_VTINHERIT
3824 || r_type == R_386_GNU_VTENTRY)
3825 {
3826 if (wrel != rel)
3827 *wrel = *rel;
3828 continue;
3829 }
3830
3831 if ((indx = r_type) >= R_386_standard
3832 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3833 >= R_386_ext - R_386_standard)
3834 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3835 >= R_386_ext2 - R_386_ext))
3836 {
3837 _bfd_error_handler
3838 /* xgettext:c-format */
3839 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3840 input_bfd, r_type, input_section);
3841 bfd_set_error (bfd_error_bad_value);
3842 return FALSE;
3843 }
3844 howto = elf_howto_table + indx;
3845
3846 r_symndx = ELF32_R_SYM (rel->r_info);
3847 h = NULL;
3848 sym = NULL;
3849 sec = NULL;
3850 unresolved_reloc = FALSE;
3851 if (r_symndx < symtab_hdr->sh_info)
3852 {
3853 sym = local_syms + r_symndx;
3854 sec = local_sections[r_symndx];
3855 relocation = (sec->output_section->vma
3856 + sec->output_offset
3857 + sym->st_value);
3858 st_size = sym->st_size;
3859
3860 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3861 && ((sec->flags & SEC_MERGE) != 0
3862 || (bfd_link_relocatable (info)
3863 && sec->output_offset != 0)))
3864 {
3865 bfd_vma addend;
3866 bfd_byte *where = contents + rel->r_offset;
3867
3868 switch (howto->size)
3869 {
3870 case 0:
3871 addend = bfd_get_8 (input_bfd, where);
3872 if (howto->pc_relative)
3873 {
3874 addend = (addend ^ 0x80) - 0x80;
3875 addend += 1;
3876 }
3877 break;
3878 case 1:
3879 addend = bfd_get_16 (input_bfd, where);
3880 if (howto->pc_relative)
3881 {
3882 addend = (addend ^ 0x8000) - 0x8000;
3883 addend += 2;
3884 }
3885 break;
3886 case 2:
3887 addend = bfd_get_32 (input_bfd, where);
3888 if (howto->pc_relative)
3889 {
3890 addend = (addend ^ 0x80000000) - 0x80000000;
3891 addend += 4;
3892 }
3893 break;
3894 default:
3895 abort ();
3896 }
3897
3898 if (bfd_link_relocatable (info))
3899 addend += sec->output_offset;
3900 else
3901 {
3902 asection *msec = sec;
3903 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3904 addend);
3905 addend -= relocation;
3906 addend += msec->output_section->vma + msec->output_offset;
3907 }
3908
3909 switch (howto->size)
3910 {
3911 case 0:
3912 /* FIXME: overflow checks. */
3913 if (howto->pc_relative)
3914 addend -= 1;
3915 bfd_put_8 (input_bfd, addend, where);
3916 break;
3917 case 1:
3918 if (howto->pc_relative)
3919 addend -= 2;
3920 bfd_put_16 (input_bfd, addend, where);
3921 break;
3922 case 2:
3923 if (howto->pc_relative)
3924 addend -= 4;
3925 bfd_put_32 (input_bfd, addend, where);
3926 break;
3927 }
3928 }
3929 else if (!bfd_link_relocatable (info)
3930 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3931 {
3932 /* Relocate against local STT_GNU_IFUNC symbol. */
3933 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3934 FALSE);
3935 if (h == NULL)
3936 abort ();
3937
3938 /* Set STT_GNU_IFUNC symbol value. */
3939 h->root.u.def.value = sym->st_value;
3940 h->root.u.def.section = sec;
3941 }
3942 }
3943 else
3944 {
3945 bfd_boolean warned ATTRIBUTE_UNUSED;
3946 bfd_boolean ignored ATTRIBUTE_UNUSED;
3947
3948 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3949 r_symndx, symtab_hdr, sym_hashes,
3950 h, sec, relocation,
3951 unresolved_reloc, warned, ignored);
3952 st_size = h->size;
3953 }
3954
3955 if (sec != NULL && discarded_section (sec))
3956 {
3957 _bfd_clear_contents (howto, input_bfd, input_section,
3958 contents + rel->r_offset);
3959 wrel->r_offset = rel->r_offset;
3960 wrel->r_info = 0;
3961 wrel->r_addend = 0;
3962
3963 /* For ld -r, remove relocations in debug sections against
3964 sections defined in discarded sections. Not done for
3965 eh_frame editing code expects to be present. */
3966 if (bfd_link_relocatable (info)
3967 && (input_section->flags & SEC_DEBUGGING))
3968 wrel--;
3969
3970 continue;
3971 }
3972
3973 if (bfd_link_relocatable (info))
3974 {
3975 if (wrel != rel)
3976 *wrel = *rel;
3977 continue;
3978 }
3979
3980 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3981 it here if it is defined in a non-shared object. */
3982 if (h != NULL
3983 && h->type == STT_GNU_IFUNC
3984 && h->def_regular)
3985 {
3986 asection *plt, *gotplt, *base_got;
3987 bfd_vma plt_index;
3988 const char *name;
3989
3990 if ((input_section->flags & SEC_ALLOC) == 0)
3991 {
3992 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3993 sections because such sections are not SEC_ALLOC and
3994 thus ld.so will not process them. */
3995 if ((input_section->flags & SEC_DEBUGGING) != 0)
3996 continue;
3997 abort ();
3998 }
3999
4000 /* STT_GNU_IFUNC symbol must go through PLT. */
4001 if (htab->elf.splt != NULL)
4002 {
4003 plt = htab->elf.splt;
4004 gotplt = htab->elf.sgotplt;
4005 }
4006 else
4007 {
4008 plt = htab->elf.iplt;
4009 gotplt = htab->elf.igotplt;
4010 }
4011
4012 switch (r_type)
4013 {
4014 default:
4015 break;
4016
4017 case R_386_GOT32:
4018 case R_386_GOT32X:
4019 base_got = htab->elf.sgot;
4020 off = h->got.offset;
4021
4022 if (base_got == NULL)
4023 abort ();
4024
4025 if (off == (bfd_vma) -1)
4026 {
4027 /* We can't use h->got.offset here to save state, or
4028 even just remember the offset, as finish_dynamic_symbol
4029 would use that as offset into .got. */
4030
4031 if (h->plt.offset == (bfd_vma) -1)
4032 abort ();
4033
4034 if (htab->elf.splt != NULL)
4035 {
4036 plt_index = h->plt.offset / plt_entry_size - 1;
4037 off = (plt_index + 3) * 4;
4038 base_got = htab->elf.sgotplt;
4039 }
4040 else
4041 {
4042 plt_index = h->plt.offset / plt_entry_size;
4043 off = plt_index * 4;
4044 base_got = htab->elf.igotplt;
4045 }
4046
4047 if (h->dynindx == -1
4048 || h->forced_local
4049 || info->symbolic)
4050 {
4051 /* This references the local defitionion. We must
4052 initialize this entry in the global offset table.
4053 Since the offset must always be a multiple of 8,
4054 we use the least significant bit to record
4055 whether we have initialized it already.
4056
4057 When doing a dynamic link, we create a .rela.got
4058 relocation entry to initialize the value. This
4059 is done in the finish_dynamic_symbol routine. */
4060 if ((off & 1) != 0)
4061 off &= ~1;
4062 else
4063 {
4064 bfd_put_32 (output_bfd, relocation,
4065 base_got->contents + off);
4066 h->got.offset |= 1;
4067 }
4068 }
4069
4070 relocation = off;
4071 }
4072 else
4073 relocation = (base_got->output_section->vma
4074 + base_got->output_offset + off
4075 - gotplt->output_section->vma
4076 - gotplt->output_offset);
4077
4078 if (rel->r_offset > 1
4079 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4080 && *(contents + rel->r_offset - 2) != 0x8d)
4081 {
4082 if (bfd_link_pic (info))
4083 goto disallow_got32;
4084
4085 /* Add the GOT base if there is no base register. */
4086 relocation += (gotplt->output_section->vma
4087 + gotplt->output_offset);
4088 }
4089 else if (htab->elf.splt == NULL)
4090 {
4091 /* Adjust for static executables. */
4092 relocation += gotplt->output_offset;
4093 }
4094
4095 goto do_relocation;
4096 }
4097
4098 if (h->plt.offset == (bfd_vma) -1)
4099 {
4100 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4101 if (r_type == R_386_32
4102 && (input_section->flags & SEC_CODE) == 0)
4103 goto do_ifunc_pointer;
4104 goto bad_ifunc_reloc;
4105 }
4106
4107 relocation = (plt->output_section->vma
4108 + plt->output_offset + h->plt.offset);
4109
4110 switch (r_type)
4111 {
4112 default:
4113 bad_ifunc_reloc:
4114 if (h->root.root.string)
4115 name = h->root.root.string;
4116 else
4117 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4118 NULL);
4119 _bfd_error_handler
4120 /* xgettext:c-format */
4121 (_("%B: relocation %s against STT_GNU_IFUNC "
4122 "symbol `%s' isn't supported"), input_bfd,
4123 howto->name, name);
4124 bfd_set_error (bfd_error_bad_value);
4125 return FALSE;
4126
4127 case R_386_32:
4128 /* Generate dynamic relcoation only when there is a
4129 non-GOT reference in a shared object. */
4130 if ((bfd_link_pic (info) && h->non_got_ref)
4131 || h->plt.offset == (bfd_vma) -1)
4132 {
4133 Elf_Internal_Rela outrel;
4134 asection *sreloc;
4135 bfd_vma offset;
4136
4137 do_ifunc_pointer:
4138 /* Need a dynamic relocation to get the real function
4139 adddress. */
4140 offset = _bfd_elf_section_offset (output_bfd,
4141 info,
4142 input_section,
4143 rel->r_offset);
4144 if (offset == (bfd_vma) -1
4145 || offset == (bfd_vma) -2)
4146 abort ();
4147
4148 outrel.r_offset = (input_section->output_section->vma
4149 + input_section->output_offset
4150 + offset);
4151
4152 if (h->dynindx == -1
4153 || h->forced_local
4154 || bfd_link_executable (info))
4155 {
4156 /* This symbol is resolved locally. */
4157 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4158 bfd_put_32 (output_bfd,
4159 (h->root.u.def.value
4160 + h->root.u.def.section->output_section->vma
4161 + h->root.u.def.section->output_offset),
4162 contents + offset);
4163 }
4164 else
4165 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4166
4167 /* Dynamic relocations are stored in
4168 1. .rel.ifunc section in PIC object.
4169 2. .rel.got section in dynamic executable.
4170 3. .rel.iplt section in static executable. */
4171 if (bfd_link_pic (info))
4172 sreloc = htab->elf.irelifunc;
4173 else if (htab->elf.splt != NULL)
4174 sreloc = htab->elf.srelgot;
4175 else
4176 sreloc = htab->elf.irelplt;
4177 elf_append_rel (output_bfd, sreloc, &outrel);
4178
4179 /* If this reloc is against an external symbol, we
4180 do not want to fiddle with the addend. Otherwise,
4181 we need to include the symbol value so that it
4182 becomes an addend for the dynamic reloc. For an
4183 internal symbol, we have updated addend. */
4184 continue;
4185 }
4186 /* FALLTHROUGH */
4187 case R_386_PC32:
4188 case R_386_PLT32:
4189 goto do_relocation;
4190
4191 case R_386_GOTOFF:
4192 relocation -= (gotplt->output_section->vma
4193 + gotplt->output_offset);
4194 goto do_relocation;
4195 }
4196 }
4197
4198 eh = (struct elf_i386_link_hash_entry *) h;
4199 resolved_to_zero = (eh != NULL
4200 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4201 eh->has_got_reloc,
4202 eh));
4203
4204 switch (r_type)
4205 {
4206 case R_386_GOT32X:
4207 /* Avoid optimizing _DYNAMIC since ld.so may use its
4208 link-time address. */
4209 if (h == htab->elf.hdynamic)
4210 goto r_386_got32;
4211
4212 if (bfd_link_pic (info))
4213 {
4214 /* It is OK to convert mov to lea and convert indirect
4215 branch to direct branch. It is OK to convert adc,
4216 add, and, cmp, or, sbb, sub, test, xor only when PIC
4217 is false. */
4218 unsigned int opcode, addend;
4219 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4220 if (addend != 0)
4221 goto r_386_got32;
4222 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4223 if (opcode != 0x8b && opcode != 0xff)
4224 goto r_386_got32;
4225 }
4226
4227 /* Resolve "mov GOT[(%reg)], %reg",
4228 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4229 and "binop foo@GOT[(%reg)], %reg". */
4230 if (h == NULL
4231 || (h->plt.offset == (bfd_vma) -1
4232 && h->got.offset == (bfd_vma) -1)
4233 || htab->elf.sgotplt == NULL)
4234 abort ();
4235
4236 offplt = (htab->elf.sgotplt->output_section->vma
4237 + htab->elf.sgotplt->output_offset);
4238
4239 /* It is relative to .got.plt section. */
4240 if (h->got.offset != (bfd_vma) -1)
4241 /* Use GOT entry. Mask off the least significant bit in
4242 GOT offset which may be set by R_386_GOT32 processing
4243 below. */
4244 relocation = (htab->elf.sgot->output_section->vma
4245 + htab->elf.sgot->output_offset
4246 + (h->got.offset & ~1) - offplt);
4247 else
4248 /* Use GOTPLT entry. */
4249 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4250
4251 if (!bfd_link_pic (info))
4252 {
4253 /* If not PIC, add the .got.plt section address for
4254 baseless addressing. */
4255 unsigned int modrm;
4256 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4257 if ((modrm & 0xc7) == 0x5)
4258 relocation += offplt;
4259 }
4260
4261 unresolved_reloc = FALSE;
4262 break;
4263
4264 case R_386_GOT32:
4265 r_386_got32:
4266 /* Relocation is to the entry for this symbol in the global
4267 offset table. */
4268 if (htab->elf.sgot == NULL)
4269 abort ();
4270
4271 if (h != NULL)
4272 {
4273 bfd_boolean dyn;
4274
4275 off = h->got.offset;
4276 dyn = htab->elf.dynamic_sections_created;
4277 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4278 bfd_link_pic (info),
4279 h)
4280 || (bfd_link_pic (info)
4281 && SYMBOL_REFERENCES_LOCAL (info, h))
4282 || (ELF_ST_VISIBILITY (h->other)
4283 && h->root.type == bfd_link_hash_undefweak))
4284 {
4285 /* This is actually a static link, or it is a
4286 -Bsymbolic link and the symbol is defined
4287 locally, or the symbol was forced to be local
4288 because of a version file. We must initialize
4289 this entry in the global offset table. Since the
4290 offset must always be a multiple of 4, we use the
4291 least significant bit to record whether we have
4292 initialized it already.
4293
4294 When doing a dynamic link, we create a .rel.got
4295 relocation entry to initialize the value. This
4296 is done in the finish_dynamic_symbol routine. */
4297 if ((off & 1) != 0)
4298 off &= ~1;
4299 else
4300 {
4301 bfd_put_32 (output_bfd, relocation,
4302 htab->elf.sgot->contents + off);
4303 h->got.offset |= 1;
4304 }
4305 }
4306 else
4307 unresolved_reloc = FALSE;
4308 }
4309 else
4310 {
4311 if (local_got_offsets == NULL)
4312 abort ();
4313
4314 off = local_got_offsets[r_symndx];
4315
4316 /* The offset must always be a multiple of 4. We use
4317 the least significant bit to record whether we have
4318 already generated the necessary reloc. */
4319 if ((off & 1) != 0)
4320 off &= ~1;
4321 else
4322 {
4323 bfd_put_32 (output_bfd, relocation,
4324 htab->elf.sgot->contents + off);
4325
4326 if (bfd_link_pic (info))
4327 {
4328 asection *s;
4329 Elf_Internal_Rela outrel;
4330
4331 s = htab->elf.srelgot;
4332 if (s == NULL)
4333 abort ();
4334
4335 outrel.r_offset = (htab->elf.sgot->output_section->vma
4336 + htab->elf.sgot->output_offset
4337 + off);
4338 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4339 elf_append_rel (output_bfd, s, &outrel);
4340 }
4341
4342 local_got_offsets[r_symndx] |= 1;
4343 }
4344 }
4345
4346 if (off >= (bfd_vma) -2)
4347 abort ();
4348
4349 relocation = (htab->elf.sgot->output_section->vma
4350 + htab->elf.sgot->output_offset + off);
4351 if (rel->r_offset > 1
4352 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4353 && *(contents + rel->r_offset - 2) != 0x8d)
4354 {
4355 if (bfd_link_pic (info))
4356 {
4357 /* For PIC, disallow R_386_GOT32 without a base
4358 register, except for "lea foo@GOT, %reg", since
4359 we don't know what the GOT base is. */
4360 const char *name;
4361
4362 disallow_got32:
4363 if (h == NULL || h->root.root.string == NULL)
4364 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4365 NULL);
4366 else
4367 name = h->root.root.string;
4368
4369 _bfd_error_handler
4370 /* xgettext:c-format */
4371 (_("%B: direct GOT relocation %s against `%s'"
4372 " without base register can not be used"
4373 " when making a shared object"),
4374 input_bfd, howto->name, name);
4375 bfd_set_error (bfd_error_bad_value);
4376 return FALSE;
4377 }
4378 }
4379 else
4380 {
4381 /* Subtract the .got.plt section address only with a base
4382 register. */
4383 relocation -= (htab->elf.sgotplt->output_section->vma
4384 + htab->elf.sgotplt->output_offset);
4385 }
4386
4387 break;
4388
4389 case R_386_GOTOFF:
4390 /* Relocation is relative to the start of the global offset
4391 table. */
4392
4393 /* Check to make sure it isn't a protected function or data
4394 symbol for shared library since it may not be local when
4395 used as function address or with copy relocation. We also
4396 need to make sure that a symbol is referenced locally. */
4397 if (!bfd_link_executable (info) && h)
4398 {
4399 if (!h->def_regular)
4400 {
4401 const char *v;
4402
4403 switch (ELF_ST_VISIBILITY (h->other))
4404 {
4405 case STV_HIDDEN:
4406 v = _("hidden symbol");
4407 break;
4408 case STV_INTERNAL:
4409 v = _("internal symbol");
4410 break;
4411 case STV_PROTECTED:
4412 v = _("protected symbol");
4413 break;
4414 default:
4415 v = _("symbol");
4416 break;
4417 }
4418
4419 _bfd_error_handler
4420 /* xgettext:c-format */
4421 (_("%B: relocation R_386_GOTOFF against undefined %s"
4422 " `%s' can not be used when making a shared object"),
4423 input_bfd, v, h->root.root.string);
4424 bfd_set_error (bfd_error_bad_value);
4425 return FALSE;
4426 }
4427 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4428 && (h->type == STT_FUNC
4429 || h->type == STT_OBJECT)
4430 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4431 {
4432 _bfd_error_handler
4433 /* xgettext:c-format */
4434 (_("%B: relocation R_386_GOTOFF against protected %s"
4435 " `%s' can not be used when making a shared object"),
4436 input_bfd,
4437 h->type == STT_FUNC ? "function" : "data",
4438 h->root.root.string);
4439 bfd_set_error (bfd_error_bad_value);
4440 return FALSE;
4441 }
4442 }
4443
4444 /* Note that sgot is not involved in this
4445 calculation. We always want the start of .got.plt. If we
4446 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4447 permitted by the ABI, we might have to change this
4448 calculation. */
4449 relocation -= htab->elf.sgotplt->output_section->vma
4450 + htab->elf.sgotplt->output_offset;
4451 break;
4452
4453 case R_386_GOTPC:
4454 /* Use global offset table as symbol value. */
4455 relocation = htab->elf.sgotplt->output_section->vma
4456 + htab->elf.sgotplt->output_offset;
4457 unresolved_reloc = FALSE;
4458 break;
4459
4460 case R_386_PLT32:
4461 /* Relocation is to the entry for this symbol in the
4462 procedure linkage table. */
4463
4464 /* Resolve a PLT32 reloc against a local symbol directly,
4465 without using the procedure linkage table. */
4466 if (h == NULL)
4467 break;
4468
4469 if ((h->plt.offset == (bfd_vma) -1
4470 && eh->plt_got.offset == (bfd_vma) -1)
4471 || htab->elf.splt == NULL)
4472 {
4473 /* We didn't make a PLT entry for this symbol. This
4474 happens when statically linking PIC code, or when
4475 using -Bsymbolic. */
4476 break;
4477 }
4478
4479 if (h->plt.offset != (bfd_vma) -1)
4480 {
4481 resolved_plt = htab->elf.splt;
4482 plt_offset = h->plt.offset;
4483 }
4484 else
4485 {
4486 resolved_plt = htab->plt_got;
4487 plt_offset = eh->plt_got.offset;
4488 }
4489
4490 relocation = (resolved_plt->output_section->vma
4491 + resolved_plt->output_offset
4492 + plt_offset);
4493 unresolved_reloc = FALSE;
4494 break;
4495
4496 case R_386_SIZE32:
4497 /* Set to symbol size. */
4498 relocation = st_size;
4499 /* Fall through. */
4500
4501 case R_386_32:
4502 case R_386_PC32:
4503 if ((input_section->flags & SEC_ALLOC) == 0
4504 || is_vxworks_tls)
4505 break;
4506
4507 /* Copy dynamic function pointer relocations. Don't generate
4508 dynamic relocations against resolved undefined weak symbols
4509 in PIE, except for R_386_PC32. */
4510 if ((bfd_link_pic (info)
4511 && (h == NULL
4512 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4513 && (!resolved_to_zero
4514 || r_type == R_386_PC32))
4515 || h->root.type != bfd_link_hash_undefweak))
4516 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4517 || !SYMBOL_CALLS_LOCAL (info, h)))
4518 || (ELIMINATE_COPY_RELOCS
4519 && !bfd_link_pic (info)
4520 && h != NULL
4521 && h->dynindx != -1
4522 && (!h->non_got_ref
4523 || eh->func_pointer_refcount > 0
4524 || (h->root.type == bfd_link_hash_undefweak
4525 && !resolved_to_zero))
4526 && ((h->def_dynamic && !h->def_regular)
4527 /* Undefined weak symbol is bound locally when
4528 PIC is false. */
4529 || h->root.type == bfd_link_hash_undefweak)))
4530 {
4531 Elf_Internal_Rela outrel;
4532 bfd_boolean skip, relocate;
4533 asection *sreloc;
4534
4535 /* When generating a shared object, these relocations
4536 are copied into the output file to be resolved at run
4537 time. */
4538
4539 skip = FALSE;
4540 relocate = FALSE;
4541
4542 outrel.r_offset =
4543 _bfd_elf_section_offset (output_bfd, info, input_section,
4544 rel->r_offset);
4545 if (outrel.r_offset == (bfd_vma) -1)
4546 skip = TRUE;
4547 else if (outrel.r_offset == (bfd_vma) -2)
4548 skip = TRUE, relocate = TRUE;
4549 outrel.r_offset += (input_section->output_section->vma
4550 + input_section->output_offset);
4551
4552 if (skip)
4553 memset (&outrel, 0, sizeof outrel);
4554 else if (h != NULL
4555 && h->dynindx != -1
4556 && (r_type == R_386_PC32
4557 || !(bfd_link_executable (info)
4558 || SYMBOLIC_BIND (info, h))
4559 || !h->def_regular))
4560 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4561 else
4562 {
4563 /* This symbol is local, or marked to become local. */
4564 relocate = TRUE;
4565 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4566 }
4567
4568 sreloc = elf_section_data (input_section)->sreloc;
4569
4570 if (sreloc == NULL || sreloc->contents == NULL)
4571 {
4572 r = bfd_reloc_notsupported;
4573 goto check_relocation_error;
4574 }
4575
4576 elf_append_rel (output_bfd, sreloc, &outrel);
4577
4578 /* If this reloc is against an external symbol, we do
4579 not want to fiddle with the addend. Otherwise, we
4580 need to include the symbol value so that it becomes
4581 an addend for the dynamic reloc. */
4582 if (! relocate)
4583 continue;
4584 }
4585 break;
4586
4587 case R_386_TLS_IE:
4588 if (!bfd_link_executable (info))
4589 {
4590 Elf_Internal_Rela outrel;
4591 asection *sreloc;
4592
4593 outrel.r_offset = rel->r_offset
4594 + input_section->output_section->vma
4595 + input_section->output_offset;
4596 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4597 sreloc = elf_section_data (input_section)->sreloc;
4598 if (sreloc == NULL)
4599 abort ();
4600 elf_append_rel (output_bfd, sreloc, &outrel);
4601 }
4602 /* Fall through */
4603
4604 case R_386_TLS_GD:
4605 case R_386_TLS_GOTDESC:
4606 case R_386_TLS_DESC_CALL:
4607 case R_386_TLS_IE_32:
4608 case R_386_TLS_GOTIE:
4609 tls_type = GOT_UNKNOWN;
4610 if (h == NULL && local_got_offsets)
4611 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4612 else if (h != NULL)
4613 tls_type = elf_i386_hash_entry(h)->tls_type;
4614 if (tls_type == GOT_TLS_IE)
4615 tls_type = GOT_TLS_IE_NEG;
4616
4617 if (! elf_i386_tls_transition (info, input_bfd,
4618 input_section, contents,
4619 symtab_hdr, sym_hashes,
4620 &r_type, tls_type, rel,
4621 relend, h, r_symndx, TRUE))
4622 return FALSE;
4623
4624 if (r_type == R_386_TLS_LE_32)
4625 {
4626 BFD_ASSERT (! unresolved_reloc);
4627 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4628 {
4629 unsigned int type;
4630 bfd_vma roff;
4631
4632 /* GD->LE transition. */
4633 type = *(contents + rel->r_offset - 2);
4634 if (type == 0x04)
4635 {
4636 /* Change
4637 leal foo@tlsgd(,%ebx,1), %eax
4638 call ___tls_get_addr@PLT
4639 into:
4640 movl %gs:0, %eax
4641 subl $foo@tpoff, %eax
4642 (6 byte form of subl). */
4643 roff = rel->r_offset + 5;
4644 }
4645 else
4646 {
4647 /* Change
4648 leal foo@tlsgd(%ebx), %eax
4649 call ___tls_get_addr@PLT
4650 nop
4651 or
4652 leal foo@tlsgd(%reg), %eax
4653 call *___tls_get_addr@GOT(%reg)
4654 which may be converted to
4655 addr32 call ___tls_get_addr
4656 into:
4657 movl %gs:0, %eax; subl $foo@tpoff, %eax
4658 (6 byte form of subl). */
4659 roff = rel->r_offset + 6;
4660 }
4661 memcpy (contents + roff - 8,
4662 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4663 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4664 contents + roff);
4665 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4666 rel++;
4667 wrel++;
4668 continue;
4669 }
4670 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4671 {
4672 /* GDesc -> LE transition.
4673 It's originally something like:
4674 leal x@tlsdesc(%ebx), %eax
4675
4676 leal x@ntpoff, %eax
4677
4678 Registers other than %eax may be set up here. */
4679
4680 unsigned int val;
4681 bfd_vma roff;
4682
4683 roff = rel->r_offset;
4684 val = bfd_get_8 (input_bfd, contents + roff - 1);
4685
4686 /* Now modify the instruction as appropriate. */
4687 /* aoliva FIXME: remove the above and xor the byte
4688 below with 0x86. */
4689 bfd_put_8 (output_bfd, val ^ 0x86,
4690 contents + roff - 1);
4691 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4692 contents + roff);
4693 continue;
4694 }
4695 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4696 {
4697 /* GDesc -> LE transition.
4698 It's originally:
4699 call *(%eax)
4700 Turn it into:
4701 xchg %ax,%ax */
4702
4703 bfd_vma roff;
4704
4705 roff = rel->r_offset;
4706 bfd_put_8 (output_bfd, 0x66, contents + roff);
4707 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4708 continue;
4709 }
4710 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4711 {
4712 unsigned int val;
4713
4714 /* IE->LE transition:
4715 Originally it can be one of:
4716 movl foo, %eax
4717 movl foo, %reg
4718 addl foo, %reg
4719 We change it into:
4720 movl $foo, %eax
4721 movl $foo, %reg
4722 addl $foo, %reg. */
4723 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4724 if (val == 0xa1)
4725 {
4726 /* movl foo, %eax. */
4727 bfd_put_8 (output_bfd, 0xb8,
4728 contents + rel->r_offset - 1);
4729 }
4730 else
4731 {
4732 unsigned int type;
4733
4734 type = bfd_get_8 (input_bfd,
4735 contents + rel->r_offset - 2);
4736 switch (type)
4737 {
4738 case 0x8b:
4739 /* movl */
4740 bfd_put_8 (output_bfd, 0xc7,
4741 contents + rel->r_offset - 2);
4742 bfd_put_8 (output_bfd,
4743 0xc0 | ((val >> 3) & 7),
4744 contents + rel->r_offset - 1);
4745 break;
4746 case 0x03:
4747 /* addl */
4748 bfd_put_8 (output_bfd, 0x81,
4749 contents + rel->r_offset - 2);
4750 bfd_put_8 (output_bfd,
4751 0xc0 | ((val >> 3) & 7),
4752 contents + rel->r_offset - 1);
4753 break;
4754 default:
4755 BFD_FAIL ();
4756 break;
4757 }
4758 }
4759 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4760 contents + rel->r_offset);
4761 continue;
4762 }
4763 else
4764 {
4765 unsigned int val, type;
4766
4767 /* {IE_32,GOTIE}->LE transition:
4768 Originally it can be one of:
4769 subl foo(%reg1), %reg2
4770 movl foo(%reg1), %reg2
4771 addl foo(%reg1), %reg2
4772 We change it into:
4773 subl $foo, %reg2
4774 movl $foo, %reg2 (6 byte form)
4775 addl $foo, %reg2. */
4776 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4777 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4778 if (type == 0x8b)
4779 {
4780 /* movl */
4781 bfd_put_8 (output_bfd, 0xc7,
4782 contents + rel->r_offset - 2);
4783 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4784 contents + rel->r_offset - 1);
4785 }
4786 else if (type == 0x2b)
4787 {
4788 /* subl */
4789 bfd_put_8 (output_bfd, 0x81,
4790 contents + rel->r_offset - 2);
4791 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4792 contents + rel->r_offset - 1);
4793 }
4794 else if (type == 0x03)
4795 {
4796 /* addl */
4797 bfd_put_8 (output_bfd, 0x81,
4798 contents + rel->r_offset - 2);
4799 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4800 contents + rel->r_offset - 1);
4801 }
4802 else
4803 BFD_FAIL ();
4804 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4805 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4806 contents + rel->r_offset);
4807 else
4808 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4809 contents + rel->r_offset);
4810 continue;
4811 }
4812 }
4813
4814 if (htab->elf.sgot == NULL)
4815 abort ();
4816
4817 if (h != NULL)
4818 {
4819 off = h->got.offset;
4820 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4821 }
4822 else
4823 {
4824 if (local_got_offsets == NULL)
4825 abort ();
4826
4827 off = local_got_offsets[r_symndx];
4828 offplt = local_tlsdesc_gotents[r_symndx];
4829 }
4830
4831 if ((off & 1) != 0)
4832 off &= ~1;
4833 else
4834 {
4835 Elf_Internal_Rela outrel;
4836 int dr_type;
4837 asection *sreloc;
4838
4839 if (htab->elf.srelgot == NULL)
4840 abort ();
4841
4842 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4843
4844 if (GOT_TLS_GDESC_P (tls_type))
4845 {
4846 bfd_byte *loc;
4847 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4848 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4849 <= htab->elf.sgotplt->size);
4850 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4851 + htab->elf.sgotplt->output_offset
4852 + offplt
4853 + htab->sgotplt_jump_table_size);
4854 sreloc = htab->elf.srelplt;
4855 loc = sreloc->contents;
4856 loc += (htab->next_tls_desc_index++
4857 * sizeof (Elf32_External_Rel));
4858 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4859 <= sreloc->contents + sreloc->size);
4860 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4861 if (indx == 0)
4862 {
4863 BFD_ASSERT (! unresolved_reloc);
4864 bfd_put_32 (output_bfd,
4865 relocation - elf_i386_dtpoff_base (info),
4866 htab->elf.sgotplt->contents + offplt
4867 + htab->sgotplt_jump_table_size + 4);
4868 }
4869 else
4870 {
4871 bfd_put_32 (output_bfd, 0,
4872 htab->elf.sgotplt->contents + offplt
4873 + htab->sgotplt_jump_table_size + 4);
4874 }
4875 }
4876
4877 sreloc = htab->elf.srelgot;
4878
4879 outrel.r_offset = (htab->elf.sgot->output_section->vma
4880 + htab->elf.sgot->output_offset + off);
4881
4882 if (GOT_TLS_GD_P (tls_type))
4883 dr_type = R_386_TLS_DTPMOD32;
4884 else if (GOT_TLS_GDESC_P (tls_type))
4885 goto dr_done;
4886 else if (tls_type == GOT_TLS_IE_POS)
4887 dr_type = R_386_TLS_TPOFF;
4888 else
4889 dr_type = R_386_TLS_TPOFF32;
4890
4891 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4892 bfd_put_32 (output_bfd,
4893 relocation - elf_i386_dtpoff_base (info),
4894 htab->elf.sgot->contents + off);
4895 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4896 bfd_put_32 (output_bfd,
4897 elf_i386_dtpoff_base (info) - relocation,
4898 htab->elf.sgot->contents + off);
4899 else if (dr_type != R_386_TLS_DESC)
4900 bfd_put_32 (output_bfd, 0,
4901 htab->elf.sgot->contents + off);
4902 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4903
4904 elf_append_rel (output_bfd, sreloc, &outrel);
4905
4906 if (GOT_TLS_GD_P (tls_type))
4907 {
4908 if (indx == 0)
4909 {
4910 BFD_ASSERT (! unresolved_reloc);
4911 bfd_put_32 (output_bfd,
4912 relocation - elf_i386_dtpoff_base (info),
4913 htab->elf.sgot->contents + off + 4);
4914 }
4915 else
4916 {
4917 bfd_put_32 (output_bfd, 0,
4918 htab->elf.sgot->contents + off + 4);
4919 outrel.r_info = ELF32_R_INFO (indx,
4920 R_386_TLS_DTPOFF32);
4921 outrel.r_offset += 4;
4922 elf_append_rel (output_bfd, sreloc, &outrel);
4923 }
4924 }
4925 else if (tls_type == GOT_TLS_IE_BOTH)
4926 {
4927 bfd_put_32 (output_bfd,
4928 (indx == 0
4929 ? relocation - elf_i386_dtpoff_base (info)
4930 : 0),
4931 htab->elf.sgot->contents + off + 4);
4932 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4933 outrel.r_offset += 4;
4934 elf_append_rel (output_bfd, sreloc, &outrel);
4935 }
4936
4937 dr_done:
4938 if (h != NULL)
4939 h->got.offset |= 1;
4940 else
4941 local_got_offsets[r_symndx] |= 1;
4942 }
4943
4944 if (off >= (bfd_vma) -2
4945 && ! GOT_TLS_GDESC_P (tls_type))
4946 abort ();
4947 if (r_type == R_386_TLS_GOTDESC
4948 || r_type == R_386_TLS_DESC_CALL)
4949 {
4950 relocation = htab->sgotplt_jump_table_size + offplt;
4951 unresolved_reloc = FALSE;
4952 }
4953 else if (r_type == ELF32_R_TYPE (rel->r_info))
4954 {
4955 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4956 + htab->elf.sgotplt->output_offset;
4957 relocation = htab->elf.sgot->output_section->vma
4958 + htab->elf.sgot->output_offset + off - g_o_t;
4959 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4960 && tls_type == GOT_TLS_IE_BOTH)
4961 relocation += 4;
4962 if (r_type == R_386_TLS_IE)
4963 relocation += g_o_t;
4964 unresolved_reloc = FALSE;
4965 }
4966 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4967 {
4968 unsigned int val, type;
4969 bfd_vma roff;
4970
4971 /* GD->IE transition. */
4972 type = *(contents + rel->r_offset - 2);
4973 val = *(contents + rel->r_offset - 1);
4974 if (type == 0x04)
4975 {
4976 /* Change
4977 leal foo@tlsgd(,%ebx,1), %eax
4978 call ___tls_get_addr@PLT
4979 into:
4980 movl %gs:0, %eax
4981 subl $foo@gottpoff(%ebx), %eax. */
4982 val >>= 3;
4983 roff = rel->r_offset - 3;
4984 }
4985 else
4986 {
4987 /* Change
4988 leal foo@tlsgd(%ebx), %eax
4989 call ___tls_get_addr@PLT
4990 nop
4991 or
4992 leal foo@tlsgd(%reg), %eax
4993 call *___tls_get_addr@GOT(%reg)
4994 which may be converted to
4995 addr32 call ___tls_get_addr
4996 into:
4997 movl %gs:0, %eax;
4998 subl $foo@gottpoff(%reg), %eax. */
4999 roff = rel->r_offset - 2;
5000 }
5001 memcpy (contents + roff,
5002 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
5003 contents[roff + 7] = 0x80 | (val & 7);
5004 /* If foo is used only with foo@gotntpoff(%reg) and
5005 foo@indntpoff, but not with foo@gottpoff(%reg), change
5006 subl $foo@gottpoff(%reg), %eax
5007 into:
5008 addl $foo@gotntpoff(%reg), %eax. */
5009 if (tls_type == GOT_TLS_IE_POS)
5010 contents[roff + 6] = 0x03;
5011 bfd_put_32 (output_bfd,
5012 htab->elf.sgot->output_section->vma
5013 + htab->elf.sgot->output_offset + off
5014 - htab->elf.sgotplt->output_section->vma
5015 - htab->elf.sgotplt->output_offset,
5016 contents + roff + 8);
5017 /* Skip R_386_PLT32 and R_386_GOT32X. */
5018 rel++;
5019 wrel++;
5020 continue;
5021 }
5022 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
5023 {
5024 /* GDesc -> IE transition.
5025 It's originally something like:
5026 leal x@tlsdesc(%ebx), %eax
5027
5028 Change it to:
5029 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
5030 or:
5031 movl x@gottpoff(%ebx), %eax # before negl %eax
5032
5033 Registers other than %eax may be set up here. */
5034
5035 bfd_vma roff;
5036
5037 /* First, make sure it's a leal adding ebx to a 32-bit
5038 offset into any register, although it's probably
5039 almost always going to be eax. */
5040 roff = rel->r_offset;
5041
5042 /* Now modify the instruction as appropriate. */
5043 /* To turn a leal into a movl in the form we use it, it
5044 suffices to change the first byte from 0x8d to 0x8b.
5045 aoliva FIXME: should we decide to keep the leal, all
5046 we have to do is remove the statement below, and
5047 adjust the relaxation of R_386_TLS_DESC_CALL. */
5048 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5049
5050 if (tls_type == GOT_TLS_IE_BOTH)
5051 off += 4;
5052
5053 bfd_put_32 (output_bfd,
5054 htab->elf.sgot->output_section->vma
5055 + htab->elf.sgot->output_offset + off
5056 - htab->elf.sgotplt->output_section->vma
5057 - htab->elf.sgotplt->output_offset,
5058 contents + roff);
5059 continue;
5060 }
5061 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
5062 {
5063 /* GDesc -> IE transition.
5064 It's originally:
5065 call *(%eax)
5066
5067 Change it to:
5068 xchg %ax,%ax
5069 or
5070 negl %eax
5071 depending on how we transformed the TLS_GOTDESC above.
5072 */
5073
5074 bfd_vma roff;
5075
5076 roff = rel->r_offset;
5077
5078 /* Now modify the instruction as appropriate. */
5079 if (tls_type != GOT_TLS_IE_NEG)
5080 {
5081 /* xchg %ax,%ax */
5082 bfd_put_8 (output_bfd, 0x66, contents + roff);
5083 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5084 }
5085 else
5086 {
5087 /* negl %eax */
5088 bfd_put_8 (output_bfd, 0xf7, contents + roff);
5089 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
5090 }
5091
5092 continue;
5093 }
5094 else
5095 BFD_ASSERT (FALSE);
5096 break;
5097
5098 case R_386_TLS_LDM:
5099 if (! elf_i386_tls_transition (info, input_bfd,
5100 input_section, contents,
5101 symtab_hdr, sym_hashes,
5102 &r_type, GOT_UNKNOWN, rel,
5103 relend, h, r_symndx, TRUE))
5104 return FALSE;
5105
5106 if (r_type != R_386_TLS_LDM)
5107 {
5108 /* LD->LE transition. Change
5109 leal foo@tlsldm(%ebx) %eax
5110 call ___tls_get_addr@PLT
5111 into:
5112 movl %gs:0, %eax
5113 nop
5114 leal 0(%esi,1), %esi
5115 or change
5116 leal foo@tlsldm(%reg) %eax
5117 call *___tls_get_addr@GOT(%reg)
5118 which may be converted to
5119 addr32 call ___tls_get_addr
5120 into:
5121 movl %gs:0, %eax
5122 leal 0(%esi), %esi */
5123 BFD_ASSERT (r_type == R_386_TLS_LE_32);
5124 if (*(contents + rel->r_offset + 4) == 0xff
5125 || *(contents + rel->r_offset + 4) == 0x67)
5126 memcpy (contents + rel->r_offset - 2,
5127 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
5128 else
5129 memcpy (contents + rel->r_offset - 2,
5130 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
5131 /* Skip R_386_PC32/R_386_PLT32. */
5132 rel++;
5133 wrel++;
5134 continue;
5135 }
5136
5137 if (htab->elf.sgot == NULL)
5138 abort ();
5139
5140 off = htab->tls_ldm_got.offset;
5141 if (off & 1)
5142 off &= ~1;
5143 else
5144 {
5145 Elf_Internal_Rela outrel;
5146
5147 if (htab->elf.srelgot == NULL)
5148 abort ();
5149
5150 outrel.r_offset = (htab->elf.sgot->output_section->vma
5151 + htab->elf.sgot->output_offset + off);
5152
5153 bfd_put_32 (output_bfd, 0,
5154 htab->elf.sgot->contents + off);
5155 bfd_put_32 (output_bfd, 0,
5156 htab->elf.sgot->contents + off + 4);
5157 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
5158 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5159 htab->tls_ldm_got.offset |= 1;
5160 }
5161 relocation = htab->elf.sgot->output_section->vma
5162 + htab->elf.sgot->output_offset + off
5163 - htab->elf.sgotplt->output_section->vma
5164 - htab->elf.sgotplt->output_offset;
5165 unresolved_reloc = FALSE;
5166 break;
5167
5168 case R_386_TLS_LDO_32:
5169 if (!bfd_link_executable (info)
5170 || (input_section->flags & SEC_CODE) == 0)
5171 relocation -= elf_i386_dtpoff_base (info);
5172 else
5173 /* When converting LDO to LE, we must negate. */
5174 relocation = -elf_i386_tpoff (info, relocation);
5175 break;
5176
5177 case R_386_TLS_LE_32:
5178 case R_386_TLS_LE:
5179 if (!bfd_link_executable (info))
5180 {
5181 Elf_Internal_Rela outrel;
5182 asection *sreloc;
5183
5184 outrel.r_offset = rel->r_offset
5185 + input_section->output_section->vma
5186 + input_section->output_offset;
5187 if (h != NULL && h->dynindx != -1)
5188 indx = h->dynindx;
5189 else
5190 indx = 0;
5191 if (r_type == R_386_TLS_LE_32)
5192 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5193 else
5194 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5195 sreloc = elf_section_data (input_section)->sreloc;
5196 if (sreloc == NULL)
5197 abort ();
5198 elf_append_rel (output_bfd, sreloc, &outrel);
5199 if (indx)
5200 continue;
5201 else if (r_type == R_386_TLS_LE_32)
5202 relocation = elf_i386_dtpoff_base (info) - relocation;
5203 else
5204 relocation -= elf_i386_dtpoff_base (info);
5205 }
5206 else if (r_type == R_386_TLS_LE_32)
5207 relocation = elf_i386_tpoff (info, relocation);
5208 else
5209 relocation = -elf_i386_tpoff (info, relocation);
5210 break;
5211
5212 default:
5213 break;
5214 }
5215
5216 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5217 because such sections are not SEC_ALLOC and thus ld.so will
5218 not process them. */
5219 if (unresolved_reloc
5220 && !((input_section->flags & SEC_DEBUGGING) != 0
5221 && h->def_dynamic)
5222 && _bfd_elf_section_offset (output_bfd, info, input_section,
5223 rel->r_offset) != (bfd_vma) -1)
5224 {
5225 _bfd_error_handler
5226 /* xgettext:c-format */
5227 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5228 input_bfd,
5229 input_section,
5230 (long) rel->r_offset,
5231 howto->name,
5232 h->root.root.string);
5233 return FALSE;
5234 }
5235
5236 do_relocation:
5237 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5238 contents, rel->r_offset,
5239 relocation, 0);
5240
5241 check_relocation_error:
5242 if (r != bfd_reloc_ok)
5243 {
5244 const char *name;
5245
5246 if (h != NULL)
5247 name = h->root.root.string;
5248 else
5249 {
5250 name = bfd_elf_string_from_elf_section (input_bfd,
5251 symtab_hdr->sh_link,
5252 sym->st_name);
5253 if (name == NULL)
5254 return FALSE;
5255 if (*name == '\0')
5256 name = bfd_section_name (input_bfd, sec);
5257 }
5258
5259 if (r == bfd_reloc_overflow)
5260 (*info->callbacks->reloc_overflow)
5261 (info, (h ? &h->root : NULL), name, howto->name,
5262 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5263 else
5264 {
5265 _bfd_error_handler
5266 /* xgettext:c-format */
5267 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5268 input_bfd, input_section,
5269 (long) rel->r_offset, name, (int) r);
5270 return FALSE;
5271 }
5272 }
5273
5274 if (wrel != rel)
5275 *wrel = *rel;
5276 }
5277
5278 if (wrel != rel)
5279 {
5280 Elf_Internal_Shdr *rel_hdr;
5281 size_t deleted = rel - wrel;
5282
5283 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5284 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5285 if (rel_hdr->sh_size == 0)
5286 {
5287 /* It is too late to remove an empty reloc section. Leave
5288 one NONE reloc.
5289 ??? What is wrong with an empty section??? */
5290 rel_hdr->sh_size = rel_hdr->sh_entsize;
5291 deleted -= 1;
5292 }
5293 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5294 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5295 input_section->reloc_count -= deleted;
5296 }
5297
5298 return TRUE;
5299 }
5300
5301 /* Finish up dynamic symbol handling. We set the contents of various
5302 dynamic sections here. */
5303
5304 static bfd_boolean
5305 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5306 struct bfd_link_info *info,
5307 struct elf_link_hash_entry *h,
5308 Elf_Internal_Sym *sym)
5309 {
5310 struct elf_i386_link_hash_table *htab;
5311 unsigned plt_entry_size;
5312 const struct elf_i386_backend_data *abed;
5313 struct elf_i386_link_hash_entry *eh;
5314 bfd_boolean local_undefweak;
5315
5316 htab = elf_i386_hash_table (info);
5317 if (htab == NULL)
5318 return FALSE;
5319
5320 abed = get_elf_i386_backend_data (output_bfd);
5321 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5322
5323 eh = (struct elf_i386_link_hash_entry *) h;
5324
5325 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5326 resolved undefined weak symbols in executable so that their
5327 references have value 0 at run-time. */
5328 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5329 eh->has_got_reloc,
5330 eh);
5331
5332 if (h->plt.offset != (bfd_vma) -1)
5333 {
5334 bfd_vma plt_index;
5335 bfd_vma got_offset;
5336 Elf_Internal_Rela rel;
5337 bfd_byte *loc;
5338 asection *plt, *gotplt, *relplt;
5339
5340 /* When building a static executable, use .iplt, .igot.plt and
5341 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5342 if (htab->elf.splt != NULL)
5343 {
5344 plt = htab->elf.splt;
5345 gotplt = htab->elf.sgotplt;
5346 relplt = htab->elf.srelplt;
5347 }
5348 else
5349 {
5350 plt = htab->elf.iplt;
5351 gotplt = htab->elf.igotplt;
5352 relplt = htab->elf.irelplt;
5353 }
5354
5355 /* This symbol has an entry in the procedure linkage table. Set
5356 it up. */
5357
5358 if ((h->dynindx == -1
5359 && !local_undefweak
5360 && !((h->forced_local || bfd_link_executable (info))
5361 && h->def_regular
5362 && h->type == STT_GNU_IFUNC))
5363 || plt == NULL
5364 || gotplt == NULL
5365 || relplt == NULL)
5366 abort ();
5367
5368 /* Get the index in the procedure linkage table which
5369 corresponds to this symbol. This is the index of this symbol
5370 in all the symbols for which we are making plt entries. The
5371 first entry in the procedure linkage table is reserved.
5372
5373 Get the offset into the .got table of the entry that
5374 corresponds to this function. Each .got entry is 4 bytes.
5375 The first three are reserved.
5376
5377 For static executables, we don't reserve anything. */
5378
5379 if (plt == htab->elf.splt)
5380 {
5381 got_offset = h->plt.offset / plt_entry_size - 1;
5382 got_offset = (got_offset + 3) * 4;
5383 }
5384 else
5385 {
5386 got_offset = h->plt.offset / plt_entry_size;
5387 got_offset = got_offset * 4;
5388 }
5389
5390 /* Fill in the entry in the procedure linkage table. */
5391 if (! bfd_link_pic (info))
5392 {
5393 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5394 abed->plt->plt_entry_size);
5395 bfd_put_32 (output_bfd,
5396 (gotplt->output_section->vma
5397 + gotplt->output_offset
5398 + got_offset),
5399 plt->contents + h->plt.offset
5400 + abed->plt->plt_got_offset);
5401
5402 if (abed->is_vxworks)
5403 {
5404 int s, k, reloc_index;
5405
5406 /* Create the R_386_32 relocation referencing the GOT
5407 for this PLT entry. */
5408
5409 /* S: Current slot number (zero-based). */
5410 s = ((h->plt.offset - abed->plt->plt_entry_size)
5411 / abed->plt->plt_entry_size);
5412 /* K: Number of relocations for PLTResolve. */
5413 if (bfd_link_pic (info))
5414 k = PLTRESOLVE_RELOCS_SHLIB;
5415 else
5416 k = PLTRESOLVE_RELOCS;
5417 /* Skip the PLTresolve relocations, and the relocations for
5418 the other PLT slots. */
5419 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5420 loc = (htab->srelplt2->contents + reloc_index
5421 * sizeof (Elf32_External_Rel));
5422
5423 rel.r_offset = (htab->elf.splt->output_section->vma
5424 + htab->elf.splt->output_offset
5425 + h->plt.offset + 2),
5426 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5427 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5428
5429 /* Create the R_386_32 relocation referencing the beginning of
5430 the PLT for this GOT entry. */
5431 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5432 + htab->elf.sgotplt->output_offset
5433 + got_offset);
5434 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5435 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5436 loc + sizeof (Elf32_External_Rel));
5437 }
5438 }
5439 else
5440 {
5441 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5442 abed->plt->plt_entry_size);
5443 bfd_put_32 (output_bfd, got_offset,
5444 plt->contents + h->plt.offset
5445 + abed->plt->plt_got_offset);
5446 }
5447
5448 /* Fill in the entry in the global offset table. Leave the entry
5449 as zero for undefined weak symbol in PIE. No PLT relocation
5450 against undefined weak symbol in PIE. */
5451 if (!local_undefweak)
5452 {
5453 bfd_put_32 (output_bfd,
5454 (plt->output_section->vma
5455 + plt->output_offset
5456 + h->plt.offset
5457 + abed->plt->plt_lazy_offset),
5458 gotplt->contents + got_offset);
5459
5460 /* Fill in the entry in the .rel.plt section. */
5461 rel.r_offset = (gotplt->output_section->vma
5462 + gotplt->output_offset
5463 + got_offset);
5464 if (h->dynindx == -1
5465 || ((bfd_link_executable (info)
5466 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5467 && h->def_regular
5468 && h->type == STT_GNU_IFUNC))
5469 {
5470 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5471 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5472 in the .got.plt section. */
5473 bfd_put_32 (output_bfd,
5474 (h->root.u.def.value
5475 + h->root.u.def.section->output_section->vma
5476 + h->root.u.def.section->output_offset),
5477 gotplt->contents + got_offset);
5478 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5479 /* R_386_IRELATIVE comes last. */
5480 plt_index = htab->next_irelative_index--;
5481 }
5482 else
5483 {
5484 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5485 plt_index = htab->next_jump_slot_index++;
5486 }
5487
5488 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5489 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5490
5491 /* Don't fill PLT entry for static executables. */
5492 if (plt == htab->elf.splt)
5493 {
5494 bfd_put_32 (output_bfd,
5495 plt_index * sizeof (Elf32_External_Rel),
5496 plt->contents + h->plt.offset
5497 + abed->plt->plt_reloc_offset);
5498 bfd_put_32 (output_bfd, - (h->plt.offset
5499 + abed->plt->plt_plt_offset + 4),
5500 plt->contents + h->plt.offset
5501 + abed->plt->plt_plt_offset);
5502 }
5503 }
5504 }
5505 else if (eh->plt_got.offset != (bfd_vma) -1)
5506 {
5507 bfd_vma got_offset, plt_offset;
5508 asection *plt, *got, *gotplt;
5509 const bfd_byte *got_plt_entry;
5510
5511 /* Offset of displacement of the indirect jump. */
5512 bfd_vma plt_got_offset = 2;
5513
5514 /* Set the entry in the GOT procedure linkage table. */
5515 plt = htab->plt_got;
5516 got = htab->elf.sgot;
5517 gotplt = htab->elf.sgotplt;
5518 got_offset = h->got.offset;
5519
5520 if (got_offset == (bfd_vma) -1
5521 || plt == NULL
5522 || got == NULL
5523 || gotplt == NULL)
5524 abort ();
5525
5526 /* Fill in the entry in the GOT procedure linkage table. */
5527 if (! bfd_link_pic (info))
5528 {
5529 got_plt_entry = elf_i386_got_plt_entry;
5530 got_offset += got->output_section->vma + got->output_offset;
5531 }
5532 else
5533 {
5534 got_plt_entry = elf_i386_pic_got_plt_entry;
5535 got_offset += (got->output_section->vma
5536 + got->output_offset
5537 - gotplt->output_section->vma
5538 - gotplt->output_offset);
5539 }
5540
5541 plt_offset = eh->plt_got.offset;
5542 memcpy (plt->contents + plt_offset, got_plt_entry,
5543 sizeof (elf_i386_got_plt_entry));
5544 bfd_put_32 (output_bfd, got_offset,
5545 plt->contents + plt_offset + plt_got_offset);
5546 }
5547
5548 if (!local_undefweak
5549 && !h->def_regular
5550 && (h->plt.offset != (bfd_vma) -1
5551 || eh->plt_got.offset != (bfd_vma) -1))
5552 {
5553 /* Mark the symbol as undefined, rather than as defined in
5554 the .plt section. Leave the value if there were any
5555 relocations where pointer equality matters (this is a clue
5556 for the dynamic linker, to make function pointer
5557 comparisons work between an application and shared
5558 library), otherwise set it to zero. If a function is only
5559 called from a binary, there is no need to slow down
5560 shared libraries because of that. */
5561 sym->st_shndx = SHN_UNDEF;
5562 if (!h->pointer_equality_needed)
5563 sym->st_value = 0;
5564 }
5565
5566 /* Don't generate dynamic GOT relocation against undefined weak
5567 symbol in executable. */
5568 if (h->got.offset != (bfd_vma) -1
5569 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5570 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5571 && !local_undefweak)
5572 {
5573 Elf_Internal_Rela rel;
5574 asection *relgot = htab->elf.srelgot;
5575
5576 /* This symbol has an entry in the global offset table. Set it
5577 up. */
5578
5579 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5580 abort ();
5581
5582 rel.r_offset = (htab->elf.sgot->output_section->vma
5583 + htab->elf.sgot->output_offset
5584 + (h->got.offset & ~(bfd_vma) 1));
5585
5586 /* If this is a static link, or it is a -Bsymbolic link and the
5587 symbol is defined locally or was forced to be local because
5588 of a version file, we just want to emit a RELATIVE reloc.
5589 The entry in the global offset table will already have been
5590 initialized in the relocate_section function. */
5591 if (h->def_regular
5592 && h->type == STT_GNU_IFUNC)
5593 {
5594 if (h->plt.offset == (bfd_vma) -1)
5595 {
5596 /* STT_GNU_IFUNC is referenced without PLT. */
5597 if (htab->elf.splt == NULL)
5598 {
5599 /* use .rel[a].iplt section to store .got relocations
5600 in static executable. */
5601 relgot = htab->elf.irelplt;
5602 }
5603 if (SYMBOL_REFERENCES_LOCAL (info, h))
5604 {
5605 bfd_put_32 (output_bfd,
5606 (h->root.u.def.value
5607 + h->root.u.def.section->output_section->vma
5608 + h->root.u.def.section->output_offset),
5609 htab->elf.sgot->contents + h->got.offset);
5610 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5611 }
5612 else
5613 goto do_glob_dat;
5614 }
5615 else if (bfd_link_pic (info))
5616 {
5617 /* Generate R_386_GLOB_DAT. */
5618 goto do_glob_dat;
5619 }
5620 else
5621 {
5622 asection *plt;
5623
5624 if (!h->pointer_equality_needed)
5625 abort ();
5626
5627 /* For non-shared object, we can't use .got.plt, which
5628 contains the real function addres if we need pointer
5629 equality. We load the GOT entry with the PLT entry. */
5630 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5631 bfd_put_32 (output_bfd,
5632 (plt->output_section->vma
5633 + plt->output_offset + h->plt.offset),
5634 htab->elf.sgot->contents + h->got.offset);
5635 return TRUE;
5636 }
5637 }
5638 else if (bfd_link_pic (info)
5639 && SYMBOL_REFERENCES_LOCAL (info, h))
5640 {
5641 BFD_ASSERT((h->got.offset & 1) != 0);
5642 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5643 }
5644 else
5645 {
5646 BFD_ASSERT((h->got.offset & 1) == 0);
5647 do_glob_dat:
5648 bfd_put_32 (output_bfd, (bfd_vma) 0,
5649 htab->elf.sgot->contents + h->got.offset);
5650 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5651 }
5652
5653 elf_append_rel (output_bfd, relgot, &rel);
5654 }
5655
5656 if (h->needs_copy)
5657 {
5658 Elf_Internal_Rela rel;
5659 asection *s;
5660
5661 /* This symbol needs a copy reloc. Set it up. */
5662
5663 if (h->dynindx == -1
5664 || (h->root.type != bfd_link_hash_defined
5665 && h->root.type != bfd_link_hash_defweak)
5666 || htab->elf.srelbss == NULL
5667 || htab->elf.sreldynrelro == NULL)
5668 abort ();
5669
5670 rel.r_offset = (h->root.u.def.value
5671 + h->root.u.def.section->output_section->vma
5672 + h->root.u.def.section->output_offset);
5673 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5674 if (h->root.u.def.section == htab->elf.sdynrelro)
5675 s = htab->elf.sreldynrelro;
5676 else
5677 s = htab->elf.srelbss;
5678 elf_append_rel (output_bfd, s, &rel);
5679 }
5680
5681 return TRUE;
5682 }
5683
5684 /* Finish up local dynamic symbol handling. We set the contents of
5685 various dynamic sections here. */
5686
5687 static bfd_boolean
5688 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5689 {
5690 struct elf_link_hash_entry *h
5691 = (struct elf_link_hash_entry *) *slot;
5692 struct bfd_link_info *info
5693 = (struct bfd_link_info *) inf;
5694
5695 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5696 h, NULL);
5697 }
5698
5699 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5700 here since undefined weak symbol may not be dynamic and may not be
5701 called for elf_i386_finish_dynamic_symbol. */
5702
5703 static bfd_boolean
5704 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5705 void *inf)
5706 {
5707 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5708 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5709
5710 if (h->root.type != bfd_link_hash_undefweak
5711 || h->dynindx != -1)
5712 return TRUE;
5713
5714 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5715 info, h, NULL);
5716 }
5717
5718 /* Used to decide how to sort relocs in an optimal manner for the
5719 dynamic linker, before writing them out. */
5720
5721 static enum elf_reloc_type_class
5722 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5723 const asection *rel_sec ATTRIBUTE_UNUSED,
5724 const Elf_Internal_Rela *rela)
5725 {
5726 bfd *abfd = info->output_bfd;
5727 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5728 struct elf_link_hash_table *htab = elf_hash_table (info);
5729
5730 if (htab->dynsym != NULL
5731 && htab->dynsym->contents != NULL)
5732 {
5733 /* Check relocation against STT_GNU_IFUNC symbol if there are
5734 dynamic symbols. */
5735 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5736 if (r_symndx != STN_UNDEF)
5737 {
5738 Elf_Internal_Sym sym;
5739 if (!bed->s->swap_symbol_in (abfd,
5740 (htab->dynsym->contents
5741 + r_symndx * sizeof (Elf32_External_Sym)),
5742 0, &sym))
5743 abort ();
5744
5745 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5746 return reloc_class_ifunc;
5747 }
5748 }
5749
5750 switch (ELF32_R_TYPE (rela->r_info))
5751 {
5752 case R_386_IRELATIVE:
5753 return reloc_class_ifunc;
5754 case R_386_RELATIVE:
5755 return reloc_class_relative;
5756 case R_386_JUMP_SLOT:
5757 return reloc_class_plt;
5758 case R_386_COPY:
5759 return reloc_class_copy;
5760 default:
5761 return reloc_class_normal;
5762 }
5763 }
5764
5765 /* Finish up the dynamic sections. */
5766
5767 static bfd_boolean
5768 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5769 struct bfd_link_info *info)
5770 {
5771 struct elf_i386_link_hash_table *htab;
5772 bfd *dynobj;
5773 asection *sdyn;
5774 const struct elf_i386_backend_data *abed;
5775
5776 htab = elf_i386_hash_table (info);
5777 if (htab == NULL)
5778 return FALSE;
5779
5780 dynobj = htab->elf.dynobj;
5781 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5782 abed = get_elf_i386_backend_data (output_bfd);
5783
5784 if (htab->elf.dynamic_sections_created)
5785 {
5786 Elf32_External_Dyn *dyncon, *dynconend;
5787
5788 if (sdyn == NULL || htab->elf.sgot == NULL)
5789 abort ();
5790
5791 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5792 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5793 for (; dyncon < dynconend; dyncon++)
5794 {
5795 Elf_Internal_Dyn dyn;
5796 asection *s;
5797
5798 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5799
5800 switch (dyn.d_tag)
5801 {
5802 default:
5803 if (abed->is_vxworks
5804 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5805 break;
5806 continue;
5807
5808 case DT_PLTGOT:
5809 s = htab->elf.sgotplt;
5810 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5811 break;
5812
5813 case DT_JMPREL:
5814 s = htab->elf.srelplt;
5815 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5816 break;
5817
5818 case DT_PLTRELSZ:
5819 s = htab->elf.srelplt;
5820 dyn.d_un.d_val = s->size;
5821 break;
5822 }
5823
5824 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5825 }
5826
5827 /* Fill in the first entry in the procedure linkage table. */
5828 if (htab->elf.splt && htab->elf.splt->size > 0)
5829 {
5830 if (bfd_link_pic (info))
5831 {
5832 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5833 abed->plt->plt0_entry_size);
5834 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5835 abed->plt0_pad_byte,
5836 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5837 }
5838 else
5839 {
5840 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5841 abed->plt->plt0_entry_size);
5842 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5843 abed->plt0_pad_byte,
5844 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5845 bfd_put_32 (output_bfd,
5846 (htab->elf.sgotplt->output_section->vma
5847 + htab->elf.sgotplt->output_offset
5848 + 4),
5849 htab->elf.splt->contents
5850 + abed->plt->plt0_got1_offset);
5851 bfd_put_32 (output_bfd,
5852 (htab->elf.sgotplt->output_section->vma
5853 + htab->elf.sgotplt->output_offset
5854 + 8),
5855 htab->elf.splt->contents
5856 + abed->plt->plt0_got2_offset);
5857
5858 if (abed->is_vxworks)
5859 {
5860 Elf_Internal_Rela rel;
5861
5862 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5863 On IA32 we use REL relocations so the addend goes in
5864 the PLT directly. */
5865 rel.r_offset = (htab->elf.splt->output_section->vma
5866 + htab->elf.splt->output_offset
5867 + abed->plt->plt0_got1_offset);
5868 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5869 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5870 htab->srelplt2->contents);
5871 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5872 rel.r_offset = (htab->elf.splt->output_section->vma
5873 + htab->elf.splt->output_offset
5874 + abed->plt->plt0_got2_offset);
5875 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5876 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5877 htab->srelplt2->contents +
5878 sizeof (Elf32_External_Rel));
5879 }
5880 }
5881
5882 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5883 really seem like the right value. */
5884 elf_section_data (htab->elf.splt->output_section)
5885 ->this_hdr.sh_entsize = 4;
5886
5887 /* Correct the .rel.plt.unloaded relocations. */
5888 if (abed->is_vxworks && !bfd_link_pic (info))
5889 {
5890 int num_plts = (htab->elf.splt->size
5891 / abed->plt->plt_entry_size) - 1;
5892 unsigned char *p;
5893
5894 p = htab->srelplt2->contents;
5895 if (bfd_link_pic (info))
5896 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5897 else
5898 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5899
5900 for (; num_plts; num_plts--)
5901 {
5902 Elf_Internal_Rela rel;
5903 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5904 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5905 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5906 p += sizeof (Elf32_External_Rel);
5907
5908 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5909 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5910 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5911 p += sizeof (Elf32_External_Rel);
5912 }
5913 }
5914 }
5915 }
5916
5917 if (htab->elf.sgotplt)
5918 {
5919 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5920 {
5921 _bfd_error_handler
5922 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5923 return FALSE;
5924 }
5925
5926 /* Fill in the first three entries in the global offset table. */
5927 if (htab->elf.sgotplt->size > 0)
5928 {
5929 bfd_put_32 (output_bfd,
5930 (sdyn == NULL ? 0
5931 : sdyn->output_section->vma + sdyn->output_offset),
5932 htab->elf.sgotplt->contents);
5933 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5934 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5935 }
5936
5937 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5938 }
5939
5940 /* Adjust .eh_frame for .plt section. */
5941 if (htab->plt_eh_frame != NULL
5942 && htab->plt_eh_frame->contents != NULL)
5943 {
5944 if (htab->elf.splt != NULL
5945 && htab->elf.splt->size != 0
5946 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5947 && htab->elf.splt->output_section != NULL
5948 && htab->plt_eh_frame->output_section != NULL)
5949 {
5950 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5951 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5952 + htab->plt_eh_frame->output_offset
5953 + PLT_FDE_START_OFFSET;
5954 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5955 htab->plt_eh_frame->contents
5956 + PLT_FDE_START_OFFSET);
5957 }
5958 if (htab->plt_eh_frame->sec_info_type
5959 == SEC_INFO_TYPE_EH_FRAME)
5960 {
5961 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5962 htab->plt_eh_frame,
5963 htab->plt_eh_frame->contents))
5964 return FALSE;
5965 }
5966 }
5967
5968 /* Adjust .eh_frame for .plt.got section. */
5969 if (htab->plt_got_eh_frame != NULL
5970 && htab->plt_got_eh_frame->contents != NULL)
5971 {
5972 if (htab->plt_got != NULL
5973 && htab->plt_got->size != 0
5974 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
5975 && htab->plt_got->output_section != NULL
5976 && htab->plt_got_eh_frame->output_section != NULL)
5977 {
5978 bfd_vma plt_start = htab->plt_got->output_section->vma;
5979 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
5980 + htab->plt_got_eh_frame->output_offset
5981 + PLT_FDE_START_OFFSET;
5982 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5983 htab->plt_got_eh_frame->contents
5984 + PLT_FDE_START_OFFSET);
5985 }
5986 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5987 {
5988 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5989 htab->plt_got_eh_frame,
5990 htab->plt_got_eh_frame->contents))
5991 return FALSE;
5992 }
5993 }
5994
5995 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5996 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5997
5998 /* Fill PLT entries for undefined weak symbols in PIE. */
5999 if (bfd_link_pie (info))
6000 bfd_hash_traverse (&info->hash->table,
6001 elf_i386_pie_finish_undefweak_symbol,
6002 info);
6003
6004 return TRUE;
6005 }
6006
6007 /* Fill PLT/GOT entries and allocate dynamic relocations for local
6008 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6009 It has to be done before elf_link_sort_relocs is called so that
6010 dynamic relocations are properly sorted. */
6011
6012 static bfd_boolean
6013 elf_i386_output_arch_local_syms
6014 (bfd *output_bfd ATTRIBUTE_UNUSED,
6015 struct bfd_link_info *info,
6016 void *flaginfo ATTRIBUTE_UNUSED,
6017 int (*func) (void *, const char *,
6018 Elf_Internal_Sym *,
6019 asection *,
6020 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
6021 {
6022 struct elf_i386_link_hash_table *htab = elf_i386_hash_table (info);
6023 if (htab == NULL)
6024 return FALSE;
6025
6026 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6027 htab_traverse (htab->loc_hash_table,
6028 elf_i386_finish_local_dynamic_symbol,
6029 info);
6030
6031 return TRUE;
6032 }
6033
6034 /* Return an array of PLT entry symbol values. */
6035
6036 static bfd_vma *
6037 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
6038 asection *relplt)
6039 {
6040 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
6041 arelent *p;
6042 long count, i;
6043 bfd_vma *plt_sym_val;
6044 bfd_vma plt_offset;
6045 bfd_byte *plt_contents;
6046 const struct elf_i386_backend_data *bed
6047 = get_elf_i386_backend_data (abfd);
6048 Elf_Internal_Shdr *hdr;
6049
6050 /* Get the .plt section contents. */
6051 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6052 if (plt_contents == NULL)
6053 return NULL;
6054 if (!bfd_get_section_contents (abfd, (asection *) plt,
6055 plt_contents, 0, plt->size))
6056 {
6057 bad_return:
6058 free (plt_contents);
6059 return NULL;
6060 }
6061
6062 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
6063 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
6064 goto bad_return;
6065
6066 hdr = &elf_section_data (relplt)->this_hdr;
6067 count = relplt->size / hdr->sh_entsize;
6068
6069 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
6070 if (plt_sym_val == NULL)
6071 goto bad_return;
6072
6073 for (i = 0; i < count; i++)
6074 plt_sym_val[i] = -1;
6075
6076 plt_offset = bed->plt->plt_entry_size;
6077 p = relplt->relocation;
6078 for (i = 0; i < count; i++, p++)
6079 {
6080 long reloc_index;
6081
6082 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
6083 if (p->howto == NULL)
6084 continue;
6085
6086 if (p->howto->type != R_386_JUMP_SLOT
6087 && p->howto->type != R_386_IRELATIVE)
6088 continue;
6089
6090 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
6091 + bed->plt->plt_reloc_offset));
6092 reloc_index /= sizeof (Elf32_External_Rel);
6093 if (reloc_index < count)
6094 plt_sym_val[reloc_index] = plt->vma + plt_offset;
6095
6096 plt_offset += bed->plt->plt_entry_size;
6097
6098 /* PR binutils/18437: Skip extra relocations in the .rel.plt
6099 section. */
6100 if (plt_offset >= plt->size)
6101 break;
6102 }
6103
6104 free (plt_contents);
6105
6106 return plt_sym_val;
6107 }
6108
6109 /* Similar to _bfd_elf_get_synthetic_symtab. */
6110
6111 static long
6112 elf_i386_get_synthetic_symtab (bfd *abfd,
6113 long symcount,
6114 asymbol **syms,
6115 long dynsymcount,
6116 asymbol **dynsyms,
6117 asymbol **ret)
6118 {
6119 asection *plt = bfd_get_section_by_name (abfd, ".plt");
6120 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
6121 dynsymcount, dynsyms, ret,
6122 plt,
6123 elf_i386_get_plt_sym_val);
6124 }
6125
6126 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6127
6128 static bfd_boolean
6129 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
6130 {
6131 if (h->plt.offset != (bfd_vma) -1
6132 && !h->def_regular
6133 && !h->pointer_equality_needed)
6134 return FALSE;
6135
6136 return _bfd_elf_hash_symbol (h);
6137 }
6138
6139 /* Parse i386 GNU properties. */
6140
6141 static enum elf_property_kind
6142 elf_i386_parse_gnu_properties (bfd *abfd, unsigned int type,
6143 bfd_byte *ptr, unsigned int datasz)
6144 {
6145 elf_property *prop;
6146
6147 switch (type)
6148 {
6149 case GNU_PROPERTY_X86_ISA_1_USED:
6150 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6151 if (datasz != 4)
6152 {
6153 _bfd_error_handler
6154 ((type == GNU_PROPERTY_X86_ISA_1_USED
6155 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6156 : _("error: %B: <corrupt x86 ISA needed size: 0x%x>")),
6157 abfd, datasz);
6158 return property_corrupt;
6159 }
6160 prop = _bfd_elf_get_property (abfd, type, datasz);
6161 prop->u.number = bfd_h_get_32 (abfd, ptr);
6162 prop->pr_kind = property_number;
6163 break;
6164
6165 default:
6166 return property_ignored;
6167 }
6168
6169 return property_number;
6170 }
6171
6172 /* Merge i386 GNU property BPROP with APROP. If APROP isn't NULL,
6173 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6174 should be merged with ABFD. */
6175
6176 static bfd_boolean
6177 elf_i386_merge_gnu_properties (bfd *abfd ATTRIBUTE_UNUSED,
6178 elf_property *aprop,
6179 elf_property *bprop)
6180 {
6181 unsigned int number;
6182 bfd_boolean updated = FALSE;
6183 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
6184
6185 switch (pr_type)
6186 {
6187 case GNU_PROPERTY_X86_ISA_1_USED:
6188 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6189 if (aprop != NULL && bprop != NULL)
6190 {
6191 number = aprop->u.number;
6192 aprop->u.number = number | bprop->u.number;
6193 updated = number != (unsigned int) aprop->u.number;
6194 }
6195 else
6196 {
6197 /* Return TRUE if APROP is NULL to indicate that BPROP should
6198 be added to ABFD. */
6199 updated = aprop == NULL;
6200 }
6201 break;
6202
6203 default:
6204 /* Never should happen. */
6205 abort ();
6206 }
6207
6208 return updated;
6209 }
6210
6211 #define TARGET_LITTLE_SYM i386_elf32_vec
6212 #define TARGET_LITTLE_NAME "elf32-i386"
6213 #define ELF_ARCH bfd_arch_i386
6214 #define ELF_TARGET_ID I386_ELF_DATA
6215 #define ELF_MACHINE_CODE EM_386
6216 #define ELF_MAXPAGESIZE 0x1000
6217
6218 #define elf_backend_can_gc_sections 1
6219 #define elf_backend_can_refcount 1
6220 #define elf_backend_want_got_plt 1
6221 #define elf_backend_plt_readonly 1
6222 #define elf_backend_want_plt_sym 0
6223 #define elf_backend_got_header_size 12
6224 #define elf_backend_plt_alignment 4
6225 #define elf_backend_dtrel_excludes_plt 1
6226 #define elf_backend_extern_protected_data 1
6227 #define elf_backend_caches_rawsize 1
6228 #define elf_backend_want_dynrelro 1
6229
6230 /* Support RELA for objdump of prelink objects. */
6231 #define elf_info_to_howto elf_i386_info_to_howto_rel
6232 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
6233
6234 #define bfd_elf32_mkobject elf_i386_mkobject
6235
6236 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
6237 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
6238 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
6239 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
6240 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
6241
6242 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
6243 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
6244 #define elf_backend_check_relocs elf_i386_check_relocs
6245 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
6246 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
6247 #define elf_backend_fake_sections elf_i386_fake_sections
6248 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
6249 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
6250 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
6251 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
6252 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
6253 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
6254 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
6255 #define elf_backend_relocate_section elf_i386_relocate_section
6256 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
6257 #define elf_backend_always_size_sections elf_i386_always_size_sections
6258 #define elf_backend_omit_section_dynsym \
6259 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6260 #define elf_backend_hash_symbol elf_i386_hash_symbol
6261 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
6262 #define elf_backend_parse_gnu_properties elf_i386_parse_gnu_properties
6263 #define elf_backend_merge_gnu_properties elf_i386_merge_gnu_properties
6264
6265 #include "elf32-target.h"
6266
6267 /* FreeBSD support. */
6268
6269 #undef TARGET_LITTLE_SYM
6270 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
6271 #undef TARGET_LITTLE_NAME
6272 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
6273 #undef ELF_OSABI
6274 #define ELF_OSABI ELFOSABI_FREEBSD
6275
6276 /* The kernel recognizes executables as valid only if they carry a
6277 "FreeBSD" label in the ELF header. So we put this label on all
6278 executables and (for simplicity) also all other object files. */
6279
6280 static void
6281 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
6282 {
6283 _bfd_elf_post_process_headers (abfd, info);
6284
6285 #ifdef OLD_FREEBSD_ABI_LABEL
6286 {
6287 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6288 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6289 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6290 }
6291 #endif
6292 }
6293
6294 #undef elf_backend_post_process_headers
6295 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6296 #undef elf32_bed
6297 #define elf32_bed elf32_i386_fbsd_bed
6298
6299 #undef elf_backend_add_symbol_hook
6300
6301 #include "elf32-target.h"
6302
6303 /* Solaris 2. */
6304
6305 #undef TARGET_LITTLE_SYM
6306 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6307 #undef TARGET_LITTLE_NAME
6308 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
6309
6310 #undef elf_backend_post_process_headers
6311
6312 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6313 objects won't be recognized. */
6314 #undef ELF_OSABI
6315
6316 #undef elf32_bed
6317 #define elf32_bed elf32_i386_sol2_bed
6318
6319 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6320 boundary. */
6321 #undef elf_backend_static_tls_alignment
6322 #define elf_backend_static_tls_alignment 8
6323
6324 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6325
6326 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6327 File, p.63. */
6328 #undef elf_backend_want_plt_sym
6329 #define elf_backend_want_plt_sym 1
6330
6331 #undef elf_backend_strtab_flags
6332 #define elf_backend_strtab_flags SHF_STRINGS
6333
6334 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
6335 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
6336 FALSE otherwise. ISECTION is the best guess matching section from the
6337 input bfd IBFD, but it might be NULL. */
6338
6339 static bfd_boolean
6340 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6341 bfd *obfd ATTRIBUTE_UNUSED,
6342 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6343 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6344 {
6345 /* PR 19938: FIXME: Need to add code for setting the sh_info
6346 and sh_link fields of Solaris specific section types. */
6347 return FALSE;
6348
6349 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
6350 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
6351
6352 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
6353
6354 The following values should be set:
6355
6356 Type Link Info
6357 -----------------------------------------------------------------------------
6358 SHT_SUNW_ancillary The section header index of 0
6359 [0x6fffffee] the associated string table.
6360
6361 SHT_SUNW_capinfo The section header index of For a dynamic object, the
6362 [0x6ffffff0] the associated symbol table. section header index of
6363 the associated
6364 SHT_SUNW_capchain table,
6365 otherwise 0.
6366
6367 SHT_SUNW_symsort The section header index of 0
6368 [0x6ffffff1] the associated symbol table.
6369
6370 SHT_SUNW_tlssort The section header index of 0
6371 [0x6ffffff2] the associated symbol table.
6372
6373 SHT_SUNW_LDYNSYM The section header index of One greater than the
6374 [0x6ffffff3] the associated string table. symbol table index of the
6375 This index is the same string last local symbol,
6376 table used by the SHT_DYNSYM STB_LOCAL. Since
6377 section. SHT_SUNW_LDYNSYM only
6378 contains local symbols,
6379 sh_info is equivalent to
6380 the number of symbols in
6381 the table.
6382
6383 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
6384 [0x6ffffff5] the section header index of to named strings, the
6385 the associated section header index of
6386 SHT_SUNW_capinfo table, the associated string
6387 otherwise 0. table, otherwise 0.
6388
6389 SHT_SUNW_move The section header index of 0
6390 [0x6ffffffa] the associated symbol table.
6391
6392 SHT_SUNW_COMDAT 0 0
6393 [0x6ffffffb]
6394
6395 SHT_SUNW_syminfo The section header index of The section header index
6396 [0x6ffffffc] the associated symbol table. of the associated
6397 .dynamic section.
6398
6399 SHT_SUNW_verdef The section header index of The number of version
6400 [0x6ffffffd] the associated string table. definitions within the
6401 section.
6402
6403 SHT_SUNW_verneed The section header index of The number of version
6404 [0x6ffffffe] the associated string table. dependencies within the
6405 section.
6406
6407 SHT_SUNW_versym The section header index of 0
6408 [0x6fffffff] the associated symbol table. */
6409 }
6410
6411 #undef elf_backend_copy_special_section_fields
6412 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
6413
6414 #include "elf32-target.h"
6415
6416 /* Intel MCU support. */
6417
6418 static bfd_boolean
6419 elf32_iamcu_elf_object_p (bfd *abfd)
6420 {
6421 /* Set the right machine number for an IAMCU elf32 file. */
6422 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6423 return TRUE;
6424 }
6425
6426 #undef TARGET_LITTLE_SYM
6427 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6428 #undef TARGET_LITTLE_NAME
6429 #define TARGET_LITTLE_NAME "elf32-iamcu"
6430 #undef ELF_ARCH
6431 #define ELF_ARCH bfd_arch_iamcu
6432
6433 #undef ELF_MACHINE_CODE
6434 #define ELF_MACHINE_CODE EM_IAMCU
6435
6436 #undef ELF_OSABI
6437
6438 #undef elf32_bed
6439 #define elf32_bed elf32_iamcu_bed
6440
6441 #undef elf_backend_object_p
6442 #define elf_backend_object_p elf32_iamcu_elf_object_p
6443
6444 #undef elf_backend_static_tls_alignment
6445
6446 #undef elf_backend_want_plt_sym
6447 #define elf_backend_want_plt_sym 0
6448
6449 #undef elf_backend_strtab_flags
6450 #undef elf_backend_copy_special_section_fields
6451
6452 #include "elf32-target.h"
6453
6454 /* Restore defaults. */
6455 #undef ELF_ARCH
6456 #define ELF_ARCH bfd_arch_i386
6457 #undef ELF_MACHINE_CODE
6458 #define ELF_MACHINE_CODE EM_386
6459
6460 /* Native Client support. */
6461
6462 #undef TARGET_LITTLE_SYM
6463 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6464 #undef TARGET_LITTLE_NAME
6465 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6466 #undef elf32_bed
6467 #define elf32_bed elf32_i386_nacl_bed
6468
6469 #undef ELF_MAXPAGESIZE
6470 #define ELF_MAXPAGESIZE 0x10000
6471
6472 /* Restore defaults. */
6473 #undef ELF_OSABI
6474 #undef elf_backend_want_plt_sym
6475 #define elf_backend_want_plt_sym 0
6476 #undef elf_backend_post_process_headers
6477 #undef elf_backend_static_tls_alignment
6478
6479 /* NaCl uses substantially different PLT entries for the same effects. */
6480
6481 #undef elf_backend_plt_alignment
6482 #define elf_backend_plt_alignment 5
6483 #define NACL_PLT_ENTRY_SIZE 64
6484 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6485
6486 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6487 {
6488 0xff, 0x35, /* pushl contents of address */
6489 0, 0, 0, 0, /* replaced with address of .got + 4. */
6490 0x8b, 0x0d, /* movl contents of address, %ecx */
6491 0, 0, 0, 0, /* replaced with address of .got + 8. */
6492 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6493 0xff, 0xe1 /* jmp *%ecx */
6494 };
6495
6496 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6497 {
6498 0x8b, 0x0d, /* movl contents of address, %ecx */
6499 0, 0, 0, 0, /* replaced with GOT slot address. */
6500 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6501 0xff, 0xe1, /* jmp *%ecx */
6502
6503 /* Pad to the next 32-byte boundary with nop instructions. */
6504 0x90,
6505 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6506 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6507
6508 /* Lazy GOT entries point here (32-byte aligned). */
6509 0x68, /* pushl immediate */
6510 0, 0, 0, 0, /* replaced with reloc offset. */
6511 0xe9, /* jmp relative */
6512 0, 0, 0, 0, /* replaced with offset to .plt. */
6513
6514 /* Pad to the next 32-byte boundary with nop instructions. */
6515 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6516 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6517 0x90, 0x90
6518 };
6519
6520 static const bfd_byte
6521 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6522 {
6523 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6524 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6525 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6526 0xff, 0xe1, /* jmp *%ecx */
6527
6528 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6529 so pad to that size with nop instructions. */
6530 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6531 };
6532
6533 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6534 {
6535 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6536 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6537 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6538 0xff, 0xe1, /* jmp *%ecx */
6539
6540 /* Pad to the next 32-byte boundary with nop instructions. */
6541 0x90,
6542 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6543 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6544
6545 /* Lazy GOT entries point here (32-byte aligned). */
6546 0x68, /* pushl immediate */
6547 0, 0, 0, 0, /* replaced with offset into relocation table. */
6548 0xe9, /* jmp relative */
6549 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6550
6551 /* Pad to the next 32-byte boundary with nop instructions. */
6552 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6553 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6554 0x90, 0x90
6555 };
6556
6557 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6558 {
6559 #if (PLT_CIE_LENGTH != 20 \
6560 || PLT_FDE_LENGTH != 36 \
6561 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6562 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6563 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6564 #endif
6565 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6566 0, 0, 0, 0, /* CIE ID */
6567 1, /* CIE version */
6568 'z', 'R', 0, /* Augmentation string */
6569 1, /* Code alignment factor */
6570 0x7c, /* Data alignment factor: -4 */
6571 8, /* Return address column */
6572 1, /* Augmentation size */
6573 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6574 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6575 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6576 DW_CFA_nop, DW_CFA_nop,
6577
6578 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6579 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6580 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6581 0, 0, 0, 0, /* .plt size goes here */
6582 0, /* Augmentation size */
6583 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6584 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6585 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6586 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6587 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6588 13, /* Block length */
6589 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6590 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6591 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6592 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6593 DW_CFA_nop, DW_CFA_nop
6594 };
6595
6596 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6597 {
6598 elf_i386_nacl_plt0_entry, /* plt0_entry */
6599 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6600 2, /* plt0_got1_offset */
6601 8, /* plt0_got2_offset */
6602 elf_i386_nacl_plt_entry, /* plt_entry */
6603 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6604 2, /* plt_got_offset */
6605 33, /* plt_reloc_offset */
6606 38, /* plt_plt_offset */
6607 32, /* plt_lazy_offset */
6608 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6609 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6610 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6611 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6612 NULL, /* eh_frame_plt_got */
6613 0, /* eh_frame_plt_got_size */
6614 };
6615
6616 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6617 {
6618 &elf_i386_nacl_plt, /* plt */
6619 0x90, /* plt0_pad_byte: nop insn */
6620 0, /* is_vxworks */
6621 };
6622
6623 static bfd_boolean
6624 elf32_i386_nacl_elf_object_p (bfd *abfd)
6625 {
6626 /* Set the right machine number for a NaCl i386 ELF32 file. */
6627 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6628 return TRUE;
6629 }
6630
6631 #undef elf_backend_arch_data
6632 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6633
6634 #undef elf_backend_object_p
6635 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6636 #undef elf_backend_modify_segment_map
6637 #define elf_backend_modify_segment_map nacl_modify_segment_map
6638 #undef elf_backend_modify_program_headers
6639 #define elf_backend_modify_program_headers nacl_modify_program_headers
6640 #undef elf_backend_final_write_processing
6641 #define elf_backend_final_write_processing nacl_final_write_processing
6642
6643 #include "elf32-target.h"
6644
6645 /* Restore defaults. */
6646 #undef elf_backend_object_p
6647 #undef elf_backend_modify_segment_map
6648 #undef elf_backend_modify_program_headers
6649 #undef elf_backend_final_write_processing
6650
6651 /* VxWorks support. */
6652
6653 #undef TARGET_LITTLE_SYM
6654 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6655 #undef TARGET_LITTLE_NAME
6656 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6657 #undef ELF_OSABI
6658 #undef elf_backend_plt_alignment
6659 #define elf_backend_plt_alignment 4
6660
6661 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6662 {
6663 &elf_i386_plt, /* plt */
6664 0x90, /* plt0_pad_byte */
6665 1, /* is_vxworks */
6666 };
6667
6668 #undef elf_backend_arch_data
6669 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6670
6671 #undef elf_backend_relocs_compatible
6672 #undef elf_backend_add_symbol_hook
6673 #define elf_backend_add_symbol_hook \
6674 elf_vxworks_add_symbol_hook
6675 #undef elf_backend_link_output_symbol_hook
6676 #define elf_backend_link_output_symbol_hook \
6677 elf_vxworks_link_output_symbol_hook
6678 #undef elf_backend_emit_relocs
6679 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6680 #undef elf_backend_final_write_processing
6681 #define elf_backend_final_write_processing \
6682 elf_vxworks_final_write_processing
6683 #undef elf_backend_static_tls_alignment
6684
6685 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6686 define it. */
6687 #undef elf_backend_want_plt_sym
6688 #define elf_backend_want_plt_sym 1
6689
6690 #undef elf32_bed
6691 #define elf32_bed elf32_i386_vxworks_bed
6692
6693 #include "elf32-target.h"
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