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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2016 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 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
387 abfd, (int) r_type);
388 indx = R_386_NONE;
389 }
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table [indx].type != r_type)
392 return NULL;
393 return &elf_howto_table[indx];
394 }
395
396 static void
397 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
398 arelent *cache_ptr,
399 Elf_Internal_Rela *dst)
400 {
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
403 }
404
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
410
411 static bfd_boolean
412 elf_i386_is_local_label_name (bfd *abfd, const char *name)
413 {
414 if (name[0] == '.' && name[1] == 'X')
415 return TRUE;
416
417 return _bfd_elf_is_local_label_name (abfd, name);
418 }
419 \f
420 /* Support for core dump NOTE sections. */
421
422 static bfd_boolean
423 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
424 {
425 int offset;
426 size_t size;
427
428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
429 {
430 int pr_version = bfd_get_32 (abfd, note->descdata);
431
432 if (pr_version != 1)
433 return FALSE;
434
435 /* pr_cursig */
436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
437
438 /* pr_pid */
439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
440
441 /* pr_reg */
442 offset = 28;
443 size = bfd_get_32 (abfd, note->descdata + 8);
444 }
445 else
446 {
447 switch (note->descsz)
448 {
449 default:
450 return FALSE;
451
452 case 144: /* Linux/i386 */
453 /* pr_cursig */
454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
455
456 /* pr_pid */
457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
458
459 /* pr_reg */
460 offset = 72;
461 size = 68;
462
463 break;
464 }
465 }
466
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
469 size, note->descpos + offset);
470 }
471
472 static bfd_boolean
473 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
474 {
475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
476 {
477 int pr_version = bfd_get_32 (abfd, note->descdata);
478
479 if (pr_version != 1)
480 return FALSE;
481
482 elf_tdata (abfd)->core->program
483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
484 elf_tdata (abfd)->core->command
485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
486 }
487 else
488 {
489 switch (note->descsz)
490 {
491 default:
492 return FALSE;
493
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd)->core->pid
496 = bfd_get_32 (abfd, note->descdata + 12);
497 elf_tdata (abfd)->core->program
498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
499 elf_tdata (abfd)->core->command
500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
501 }
502 }
503
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
507 {
508 char *command = elf_tdata (abfd)->core->command;
509 int n = strlen (command);
510
511 if (0 < n && command[n - 1] == ' ')
512 command[n - 1] = '\0';
513 }
514
515 return TRUE;
516 }
517 \f
518 /* Functions for the i386 ELF linker.
519
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
522 following:
523
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
530
531
532 /* The name of the dynamic interpreter. This is put in the .interp
533 section. */
534
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
536
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
540 shared lib. */
541 #define ELIMINATE_COPY_RELOCS 1
542
543 /* The size in bytes of an entry in the procedure linkage table. */
544
545 #define PLT_ENTRY_SIZE 16
546
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
550
551 static const bfd_byte elf_i386_plt0_entry[12] =
552 {
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
557 };
558
559 /* Subsequent entries in an absolute procedure linkage table look like
560 this. */
561
562 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
570 };
571
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
574
575 static const bfd_byte elf_i386_pic_plt0_entry[12] =
576 {
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
579 };
580
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
582
583 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
584 {
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
591 };
592
593 /* Entries in the GOT procedure linkage table look like this. */
594
595 static const bfd_byte elf_i386_got_plt_entry[8] =
596 {
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
600 };
601
602 /* Entries in the PIC GOT procedure linkage table look like this. */
603
604 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
605 {
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
609 };
610
611 /* .eh_frame covering the .plt section. */
612
613 static const bfd_byte elf_i386_eh_frame_plt[] =
614 {
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
621 1, /* CIE version */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop, DW_CFA_nop,
631
632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
646 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
648 };
649
650 struct elf_i386_plt_layout
651 {
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte *plt0_entry;
654 unsigned int plt0_entry_size;
655
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset;
658 unsigned int plt0_got2_offset;
659
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte *plt_entry;
662 unsigned int plt_entry_size;
663
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
668
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset;
671
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte *pic_plt0_entry;
674
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte *pic_plt_entry;
677
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte *eh_frame_plt;
680 unsigned int eh_frame_plt_size;
681 };
682
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
685
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt =
688 {
689 elf_i386_plt0_entry, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry, /* plt_entry */
694 PLT_ENTRY_SIZE, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry, /* pic_plt_entry */
701 elf_i386_eh_frame_plt, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
703 };
704 \f
705
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
711
712 /* Architecture-specific backend data for i386. */
713
714 struct elf_i386_backend_data
715 {
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout *plt;
718
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte;
721
722 /* True if the target system is VxWorks. */
723 int is_vxworks;
724 };
725
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
729
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed =
732 {
733 &elf_i386_plt, /* plt */
734 0, /* plt0_pad_byte */
735 0, /* is_vxworks */
736 };
737
738 #define elf_backend_arch_data &elf_i386_arch_bed
739
740 /* Is a undefined weak symbol which is resolved to 0. Reference to an
741 undefined weak symbol is resolved to 0 when building executable if
742 it isn't dynamic and
743 1. Has non-GOT/non-PLT relocations in text section. Or
744 2. Has no GOT/PLT relocation.
745 */
746 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, EH) \
747 ((EH)->elf.root.type == bfd_link_hash_undefweak \
748 && bfd_link_executable (INFO) \
749 && (elf_i386_hash_table (INFO)->interp == NULL \
750 || !(EH)->has_got_reloc \
751 || (EH)->has_non_got_reloc \
752 || !(INFO)->dynamic_undefined_weak))
753
754 /* i386 ELF linker hash entry. */
755
756 struct elf_i386_link_hash_entry
757 {
758 struct elf_link_hash_entry elf;
759
760 /* Track dynamic relocs copied for this symbol. */
761 struct elf_dyn_relocs *dyn_relocs;
762
763 #define GOT_UNKNOWN 0
764 #define GOT_NORMAL 1
765 #define GOT_TLS_GD 2
766 #define GOT_TLS_IE 4
767 #define GOT_TLS_IE_POS 5
768 #define GOT_TLS_IE_NEG 6
769 #define GOT_TLS_IE_BOTH 7
770 #define GOT_TLS_GDESC 8
771 #define GOT_TLS_GD_BOTH_P(type) \
772 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
773 #define GOT_TLS_GD_P(type) \
774 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
775 #define GOT_TLS_GDESC_P(type) \
776 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
777 #define GOT_TLS_GD_ANY_P(type) \
778 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
779 unsigned char tls_type;
780
781 /* Symbol is referenced by R_386_GOTOFF relocation. */
782 unsigned int gotoff_ref : 1;
783
784 /* Symbol has GOT or PLT relocations. */
785 unsigned int has_got_reloc : 1;
786
787 /* Symbol has non-GOT/non-PLT relocations in text sections. */
788 unsigned int has_non_got_reloc : 1;
789
790 /* Reference count of C/C++ function pointer relocations in read-write
791 section which can be resolved at run-time. */
792 bfd_signed_vma func_pointer_refcount;
793
794 /* Information about the GOT PLT entry. Filled when there are both
795 GOT and PLT relocations against the same function. */
796 union gotplt_union plt_got;
797
798 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
799 starting at the end of the jump table. */
800 bfd_vma tlsdesc_got;
801 };
802
803 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
804
805 struct elf_i386_obj_tdata
806 {
807 struct elf_obj_tdata root;
808
809 /* tls_type for each local got entry. */
810 char *local_got_tls_type;
811
812 /* GOTPLT entries for TLS descriptors. */
813 bfd_vma *local_tlsdesc_gotent;
814 };
815
816 #define elf_i386_tdata(abfd) \
817 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
818
819 #define elf_i386_local_got_tls_type(abfd) \
820 (elf_i386_tdata (abfd)->local_got_tls_type)
821
822 #define elf_i386_local_tlsdesc_gotent(abfd) \
823 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
824
825 #define is_i386_elf(bfd) \
826 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
827 && elf_tdata (bfd) != NULL \
828 && elf_object_id (bfd) == I386_ELF_DATA)
829
830 static bfd_boolean
831 elf_i386_mkobject (bfd *abfd)
832 {
833 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
834 I386_ELF_DATA);
835 }
836
837 /* i386 ELF linker hash table. */
838
839 struct elf_i386_link_hash_table
840 {
841 struct elf_link_hash_table elf;
842
843 /* Short-cuts to get to dynamic linker sections. */
844 asection *interp;
845 asection *sdynbss;
846 asection *srelbss;
847 asection *plt_eh_frame;
848 asection *plt_got;
849
850 union
851 {
852 bfd_signed_vma refcount;
853 bfd_vma offset;
854 } tls_ldm_got;
855
856 /* The amount of space used by the reserved portion of the sgotplt
857 section, plus whatever space is used by the jump slots. */
858 bfd_vma sgotplt_jump_table_size;
859
860 /* Small local sym cache. */
861 struct sym_cache sym_cache;
862
863 /* _TLS_MODULE_BASE_ symbol. */
864 struct bfd_link_hash_entry *tls_module_base;
865
866 /* Used by local STT_GNU_IFUNC symbols. */
867 htab_t loc_hash_table;
868 void * loc_hash_memory;
869
870 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
871 asection *srelplt2;
872
873 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
874 bfd_vma next_tls_desc_index;
875
876 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
877 bfd_vma next_jump_slot_index;
878
879 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
880 bfd_vma next_irelative_index;
881 };
882
883 /* Get the i386 ELF linker hash table from a link_info structure. */
884
885 #define elf_i386_hash_table(p) \
886 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
887 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
888
889 #define elf_i386_compute_jump_table_size(htab) \
890 ((htab)->elf.srelplt->reloc_count * 4)
891
892 /* Create an entry in an i386 ELF linker hash table. */
893
894 static struct bfd_hash_entry *
895 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
896 struct bfd_hash_table *table,
897 const char *string)
898 {
899 /* Allocate the structure if it has not already been allocated by a
900 subclass. */
901 if (entry == NULL)
902 {
903 entry = (struct bfd_hash_entry *)
904 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
905 if (entry == NULL)
906 return entry;
907 }
908
909 /* Call the allocation method of the superclass. */
910 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
911 if (entry != NULL)
912 {
913 struct elf_i386_link_hash_entry *eh;
914
915 eh = (struct elf_i386_link_hash_entry *) entry;
916 eh->dyn_relocs = NULL;
917 eh->tls_type = GOT_UNKNOWN;
918 eh->gotoff_ref = 0;
919 eh->has_got_reloc = 0;
920 eh->has_non_got_reloc = 0;
921 eh->func_pointer_refcount = 0;
922 eh->plt_got.offset = (bfd_vma) -1;
923 eh->tlsdesc_got = (bfd_vma) -1;
924 }
925
926 return entry;
927 }
928
929 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
930 for local symbol so that we can handle local STT_GNU_IFUNC symbols
931 as global symbol. We reuse indx and dynstr_index for local symbol
932 hash since they aren't used by global symbols in this backend. */
933
934 static hashval_t
935 elf_i386_local_htab_hash (const void *ptr)
936 {
937 struct elf_link_hash_entry *h
938 = (struct elf_link_hash_entry *) ptr;
939 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
940 }
941
942 /* Compare local hash entries. */
943
944 static int
945 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
946 {
947 struct elf_link_hash_entry *h1
948 = (struct elf_link_hash_entry *) ptr1;
949 struct elf_link_hash_entry *h2
950 = (struct elf_link_hash_entry *) ptr2;
951
952 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
953 }
954
955 /* Find and/or create a hash entry for local symbol. */
956
957 static struct elf_link_hash_entry *
958 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
959 bfd *abfd, const Elf_Internal_Rela *rel,
960 bfd_boolean create)
961 {
962 struct elf_i386_link_hash_entry e, *ret;
963 asection *sec = abfd->sections;
964 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
965 ELF32_R_SYM (rel->r_info));
966 void **slot;
967
968 e.elf.indx = sec->id;
969 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
970 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
971 create ? INSERT : NO_INSERT);
972
973 if (!slot)
974 return NULL;
975
976 if (*slot)
977 {
978 ret = (struct elf_i386_link_hash_entry *) *slot;
979 return &ret->elf;
980 }
981
982 ret = (struct elf_i386_link_hash_entry *)
983 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
984 sizeof (struct elf_i386_link_hash_entry));
985 if (ret)
986 {
987 memset (ret, 0, sizeof (*ret));
988 ret->elf.indx = sec->id;
989 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
990 ret->elf.dynindx = -1;
991 ret->func_pointer_refcount = 0;
992 ret->plt_got.offset = (bfd_vma) -1;
993 *slot = ret;
994 }
995 return &ret->elf;
996 }
997
998 /* Destroy an i386 ELF linker hash table. */
999
1000 static void
1001 elf_i386_link_hash_table_free (bfd *obfd)
1002 {
1003 struct elf_i386_link_hash_table *htab
1004 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1005
1006 if (htab->loc_hash_table)
1007 htab_delete (htab->loc_hash_table);
1008 if (htab->loc_hash_memory)
1009 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1010 _bfd_elf_link_hash_table_free (obfd);
1011 }
1012
1013 /* Create an i386 ELF linker hash table. */
1014
1015 static struct bfd_link_hash_table *
1016 elf_i386_link_hash_table_create (bfd *abfd)
1017 {
1018 struct elf_i386_link_hash_table *ret;
1019 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1020
1021 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1022 if (ret == NULL)
1023 return NULL;
1024
1025 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1026 elf_i386_link_hash_newfunc,
1027 sizeof (struct elf_i386_link_hash_entry),
1028 I386_ELF_DATA))
1029 {
1030 free (ret);
1031 return NULL;
1032 }
1033
1034 ret->loc_hash_table = htab_try_create (1024,
1035 elf_i386_local_htab_hash,
1036 elf_i386_local_htab_eq,
1037 NULL);
1038 ret->loc_hash_memory = objalloc_create ();
1039 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1040 {
1041 elf_i386_link_hash_table_free (abfd);
1042 return NULL;
1043 }
1044 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1045
1046 return &ret->elf.root;
1047 }
1048
1049 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1050 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1051 hash table. */
1052
1053 static bfd_boolean
1054 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1055 {
1056 struct elf_i386_link_hash_table *htab;
1057
1058 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1059 return FALSE;
1060
1061 htab = elf_i386_hash_table (info);
1062 if (htab == NULL)
1063 return FALSE;
1064
1065 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1066 if (!htab->sdynbss)
1067 abort ();
1068
1069 if (bfd_link_executable (info))
1070 {
1071 /* Always allow copy relocs for building executables. */
1072 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1073 if (s == NULL)
1074 {
1075 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1076 s = bfd_make_section_anyway_with_flags (dynobj,
1077 ".rel.bss",
1078 (bed->dynamic_sec_flags
1079 | SEC_READONLY));
1080 if (s == NULL
1081 || ! bfd_set_section_alignment (dynobj, s,
1082 bed->s->log_file_align))
1083 return FALSE;
1084 }
1085 htab->srelbss = s;
1086 }
1087
1088 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1089 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1090 &htab->srelplt2))
1091 return FALSE;
1092
1093 if (!info->no_ld_generated_unwind_info
1094 && htab->plt_eh_frame == NULL
1095 && htab->elf.splt != NULL)
1096 {
1097 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1098 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1099 | SEC_LINKER_CREATED);
1100 htab->plt_eh_frame
1101 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1102 if (htab->plt_eh_frame == NULL
1103 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1104 return FALSE;
1105 }
1106
1107 return TRUE;
1108 }
1109
1110 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1111
1112 static void
1113 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1114 struct elf_link_hash_entry *dir,
1115 struct elf_link_hash_entry *ind)
1116 {
1117 struct elf_i386_link_hash_entry *edir, *eind;
1118
1119 edir = (struct elf_i386_link_hash_entry *) dir;
1120 eind = (struct elf_i386_link_hash_entry *) ind;
1121
1122 if (eind->dyn_relocs != NULL)
1123 {
1124 if (edir->dyn_relocs != NULL)
1125 {
1126 struct elf_dyn_relocs **pp;
1127 struct elf_dyn_relocs *p;
1128
1129 /* Add reloc counts against the indirect sym to the direct sym
1130 list. Merge any entries against the same section. */
1131 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1132 {
1133 struct elf_dyn_relocs *q;
1134
1135 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1136 if (q->sec == p->sec)
1137 {
1138 q->pc_count += p->pc_count;
1139 q->count += p->count;
1140 *pp = p->next;
1141 break;
1142 }
1143 if (q == NULL)
1144 pp = &p->next;
1145 }
1146 *pp = edir->dyn_relocs;
1147 }
1148
1149 edir->dyn_relocs = eind->dyn_relocs;
1150 eind->dyn_relocs = NULL;
1151 }
1152
1153 if (ind->root.type == bfd_link_hash_indirect
1154 && dir->got.refcount <= 0)
1155 {
1156 edir->tls_type = eind->tls_type;
1157 eind->tls_type = GOT_UNKNOWN;
1158 }
1159
1160 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1161 generate a R_386_COPY reloc. */
1162 edir->gotoff_ref |= eind->gotoff_ref;
1163
1164 edir->has_got_reloc |= eind->has_got_reloc;
1165 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1166
1167 if (ELIMINATE_COPY_RELOCS
1168 && ind->root.type != bfd_link_hash_indirect
1169 && dir->dynamic_adjusted)
1170 {
1171 /* If called to transfer flags for a weakdef during processing
1172 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1173 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1174 dir->ref_dynamic |= ind->ref_dynamic;
1175 dir->ref_regular |= ind->ref_regular;
1176 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1177 dir->needs_plt |= ind->needs_plt;
1178 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1179 }
1180 else
1181 {
1182 if (eind->func_pointer_refcount > 0)
1183 {
1184 edir->func_pointer_refcount += eind->func_pointer_refcount;
1185 eind->func_pointer_refcount = 0;
1186 }
1187
1188 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1189 }
1190 }
1191
1192 /* Return TRUE if the TLS access code sequence support transition
1193 from R_TYPE. */
1194
1195 static bfd_boolean
1196 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1197 bfd_byte *contents,
1198 Elf_Internal_Shdr *symtab_hdr,
1199 struct elf_link_hash_entry **sym_hashes,
1200 unsigned int r_type,
1201 const Elf_Internal_Rela *rel,
1202 const Elf_Internal_Rela *relend)
1203 {
1204 unsigned int val, type;
1205 unsigned long r_symndx;
1206 struct elf_link_hash_entry *h;
1207 bfd_vma offset;
1208
1209 /* Get the section contents. */
1210 if (contents == NULL)
1211 {
1212 if (elf_section_data (sec)->this_hdr.contents != NULL)
1213 contents = elf_section_data (sec)->this_hdr.contents;
1214 else
1215 {
1216 /* FIXME: How to better handle error condition? */
1217 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1218 return FALSE;
1219
1220 /* Cache the section contents for elf_link_input_bfd. */
1221 elf_section_data (sec)->this_hdr.contents = contents;
1222 }
1223 }
1224
1225 offset = rel->r_offset;
1226 switch (r_type)
1227 {
1228 case R_386_TLS_GD:
1229 case R_386_TLS_LDM:
1230 if (offset < 2 || (rel + 1) >= relend)
1231 return FALSE;
1232
1233 type = bfd_get_8 (abfd, contents + offset - 2);
1234 if (r_type == R_386_TLS_GD)
1235 {
1236 /* Check transition from GD access model. Only
1237 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1238 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1239 can transit to different access model. */
1240 if ((offset + 10) > sec->size ||
1241 (type != 0x8d && type != 0x04))
1242 return FALSE;
1243
1244 val = bfd_get_8 (abfd, contents + offset - 1);
1245 if (type == 0x04)
1246 {
1247 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1248 if (offset < 3)
1249 return FALSE;
1250
1251 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1252 return FALSE;
1253
1254 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1255 return FALSE;
1256 }
1257 else
1258 {
1259 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1260 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1261 return FALSE;
1262
1263 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1264 return FALSE;
1265 }
1266 }
1267 else
1268 {
1269 /* Check transition from LD access model. Only
1270 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1271 can transit to different access model. */
1272 if (type != 0x8d || (offset + 9) > sec->size)
1273 return FALSE;
1274
1275 val = bfd_get_8 (abfd, contents + offset - 1);
1276 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1277 return FALSE;
1278 }
1279
1280 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1281 return FALSE;
1282
1283 r_symndx = ELF32_R_SYM (rel[1].r_info);
1284 if (r_symndx < symtab_hdr->sh_info)
1285 return FALSE;
1286
1287 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1288 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1289 may be versioned. */
1290 return (h != NULL
1291 && h->root.root.string != NULL
1292 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1293 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1294 && (strncmp (h->root.root.string, "___tls_get_addr",
1295 15) == 0));
1296
1297 case R_386_TLS_IE:
1298 /* Check transition from IE access model:
1299 movl foo@indntpoff(%rip), %eax
1300 movl foo@indntpoff(%rip), %reg
1301 addl foo@indntpoff(%rip), %reg
1302 */
1303
1304 if (offset < 1 || (offset + 4) > sec->size)
1305 return FALSE;
1306
1307 /* Check "movl foo@tpoff(%rip), %eax" first. */
1308 val = bfd_get_8 (abfd, contents + offset - 1);
1309 if (val == 0xa1)
1310 return TRUE;
1311
1312 if (offset < 2)
1313 return FALSE;
1314
1315 /* Check movl|addl foo@tpoff(%rip), %reg. */
1316 type = bfd_get_8 (abfd, contents + offset - 2);
1317 return ((type == 0x8b || type == 0x03)
1318 && (val & 0xc7) == 0x05);
1319
1320 case R_386_TLS_GOTIE:
1321 case R_386_TLS_IE_32:
1322 /* Check transition from {IE_32,GOTIE} access model:
1323 subl foo@{tpoff,gontoff}(%reg1), %reg2
1324 movl foo@{tpoff,gontoff}(%reg1), %reg2
1325 addl foo@{tpoff,gontoff}(%reg1), %reg2
1326 */
1327
1328 if (offset < 2 || (offset + 4) > sec->size)
1329 return FALSE;
1330
1331 val = bfd_get_8 (abfd, contents + offset - 1);
1332 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1333 return FALSE;
1334
1335 type = bfd_get_8 (abfd, contents + offset - 2);
1336 return type == 0x8b || type == 0x2b || type == 0x03;
1337
1338 case R_386_TLS_GOTDESC:
1339 /* Check transition from GDesc access model:
1340 leal x@tlsdesc(%ebx), %eax
1341
1342 Make sure it's a leal adding ebx to a 32-bit offset
1343 into any register, although it's probably almost always
1344 going to be eax. */
1345
1346 if (offset < 2 || (offset + 4) > sec->size)
1347 return FALSE;
1348
1349 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1350 return FALSE;
1351
1352 val = bfd_get_8 (abfd, contents + offset - 1);
1353 return (val & 0xc7) == 0x83;
1354
1355 case R_386_TLS_DESC_CALL:
1356 /* Check transition from GDesc access model:
1357 call *x@tlsdesc(%rax)
1358 */
1359 if (offset + 2 <= sec->size)
1360 {
1361 /* Make sure that it's a call *x@tlsdesc(%rax). */
1362 static const unsigned char call[] = { 0xff, 0x10 };
1363 return memcmp (contents + offset, call, 2) == 0;
1364 }
1365
1366 return FALSE;
1367
1368 default:
1369 abort ();
1370 }
1371 }
1372
1373 /* Return TRUE if the TLS access transition is OK or no transition
1374 will be performed. Update R_TYPE if there is a transition. */
1375
1376 static bfd_boolean
1377 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1378 asection *sec, bfd_byte *contents,
1379 Elf_Internal_Shdr *symtab_hdr,
1380 struct elf_link_hash_entry **sym_hashes,
1381 unsigned int *r_type, int tls_type,
1382 const Elf_Internal_Rela *rel,
1383 const Elf_Internal_Rela *relend,
1384 struct elf_link_hash_entry *h,
1385 unsigned long r_symndx)
1386 {
1387 unsigned int from_type = *r_type;
1388 unsigned int to_type = from_type;
1389 bfd_boolean check = TRUE;
1390
1391 /* Skip TLS transition for functions. */
1392 if (h != NULL
1393 && (h->type == STT_FUNC
1394 || h->type == STT_GNU_IFUNC))
1395 return TRUE;
1396
1397 switch (from_type)
1398 {
1399 case R_386_TLS_GD:
1400 case R_386_TLS_GOTDESC:
1401 case R_386_TLS_DESC_CALL:
1402 case R_386_TLS_IE_32:
1403 case R_386_TLS_IE:
1404 case R_386_TLS_GOTIE:
1405 if (bfd_link_executable (info))
1406 {
1407 if (h == NULL)
1408 to_type = R_386_TLS_LE_32;
1409 else if (from_type != R_386_TLS_IE
1410 && from_type != R_386_TLS_GOTIE)
1411 to_type = R_386_TLS_IE_32;
1412 }
1413
1414 /* When we are called from elf_i386_relocate_section, CONTENTS
1415 isn't NULL and there may be additional transitions based on
1416 TLS_TYPE. */
1417 if (contents != NULL)
1418 {
1419 unsigned int new_to_type = to_type;
1420
1421 if (bfd_link_executable (info)
1422 && h != NULL
1423 && h->dynindx == -1
1424 && (tls_type & GOT_TLS_IE))
1425 new_to_type = R_386_TLS_LE_32;
1426
1427 if (to_type == R_386_TLS_GD
1428 || to_type == R_386_TLS_GOTDESC
1429 || to_type == R_386_TLS_DESC_CALL)
1430 {
1431 if (tls_type == GOT_TLS_IE_POS)
1432 new_to_type = R_386_TLS_GOTIE;
1433 else if (tls_type & GOT_TLS_IE)
1434 new_to_type = R_386_TLS_IE_32;
1435 }
1436
1437 /* We checked the transition before when we were called from
1438 elf_i386_check_relocs. We only want to check the new
1439 transition which hasn't been checked before. */
1440 check = new_to_type != to_type && from_type == to_type;
1441 to_type = new_to_type;
1442 }
1443
1444 break;
1445
1446 case R_386_TLS_LDM:
1447 if (bfd_link_executable (info))
1448 to_type = R_386_TLS_LE_32;
1449 break;
1450
1451 default:
1452 return TRUE;
1453 }
1454
1455 /* Return TRUE if there is no transition. */
1456 if (from_type == to_type)
1457 return TRUE;
1458
1459 /* Check if the transition can be performed. */
1460 if (check
1461 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1462 symtab_hdr, sym_hashes,
1463 from_type, rel, relend))
1464 {
1465 reloc_howto_type *from, *to;
1466 const char *name;
1467
1468 from = elf_i386_rtype_to_howto (abfd, from_type);
1469 to = elf_i386_rtype_to_howto (abfd, to_type);
1470
1471 if (h)
1472 name = h->root.root.string;
1473 else
1474 {
1475 struct elf_i386_link_hash_table *htab;
1476
1477 htab = elf_i386_hash_table (info);
1478 if (htab == NULL)
1479 name = "*unknown*";
1480 else
1481 {
1482 Elf_Internal_Sym *isym;
1483
1484 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1485 abfd, r_symndx);
1486 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1487 }
1488 }
1489
1490 (*_bfd_error_handler)
1491 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1492 "in section `%A' failed"),
1493 abfd, sec, from->name, to->name, name,
1494 (unsigned long) rel->r_offset);
1495 bfd_set_error (bfd_error_bad_value);
1496 return FALSE;
1497 }
1498
1499 *r_type = to_type;
1500 return TRUE;
1501 }
1502
1503 /* Rename some of the generic section flags to better document how they
1504 are used here. */
1505 #define need_convert_load sec_flg0
1506
1507 /* Look through the relocs for a section during the first phase, and
1508 calculate needed space in the global offset table, procedure linkage
1509 table, and dynamic reloc sections. */
1510
1511 static bfd_boolean
1512 elf_i386_check_relocs (bfd *abfd,
1513 struct bfd_link_info *info,
1514 asection *sec,
1515 const Elf_Internal_Rela *relocs)
1516 {
1517 struct elf_i386_link_hash_table *htab;
1518 Elf_Internal_Shdr *symtab_hdr;
1519 struct elf_link_hash_entry **sym_hashes;
1520 const Elf_Internal_Rela *rel;
1521 const Elf_Internal_Rela *rel_end;
1522 asection *sreloc;
1523 bfd_boolean use_plt_got;
1524
1525 if (bfd_link_relocatable (info))
1526 return TRUE;
1527
1528 BFD_ASSERT (is_i386_elf (abfd));
1529
1530 htab = elf_i386_hash_table (info);
1531 if (htab == NULL)
1532 return FALSE;
1533
1534 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1535 && (get_elf_i386_backend_data (abfd)
1536 == &elf_i386_arch_bed));
1537
1538 symtab_hdr = &elf_symtab_hdr (abfd);
1539 sym_hashes = elf_sym_hashes (abfd);
1540
1541 sreloc = NULL;
1542
1543 rel_end = relocs + sec->reloc_count;
1544 for (rel = relocs; rel < rel_end; rel++)
1545 {
1546 unsigned int r_type;
1547 unsigned long r_symndx;
1548 struct elf_link_hash_entry *h;
1549 struct elf_i386_link_hash_entry *eh;
1550 Elf_Internal_Sym *isym;
1551 const char *name;
1552 bfd_boolean size_reloc;
1553
1554 r_symndx = ELF32_R_SYM (rel->r_info);
1555 r_type = ELF32_R_TYPE (rel->r_info);
1556
1557 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1558 {
1559 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1560 abfd,
1561 r_symndx);
1562 return FALSE;
1563 }
1564
1565 if (r_symndx < symtab_hdr->sh_info)
1566 {
1567 /* A local symbol. */
1568 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1569 abfd, r_symndx);
1570 if (isym == NULL)
1571 return FALSE;
1572
1573 /* Check relocation against local STT_GNU_IFUNC symbol. */
1574 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1575 {
1576 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1577 if (h == NULL)
1578 return FALSE;
1579
1580 /* Fake a STT_GNU_IFUNC symbol. */
1581 h->type = STT_GNU_IFUNC;
1582 h->def_regular = 1;
1583 h->ref_regular = 1;
1584 h->forced_local = 1;
1585 h->root.type = bfd_link_hash_defined;
1586 }
1587 else
1588 h = NULL;
1589 }
1590 else
1591 {
1592 isym = NULL;
1593 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1594 while (h->root.type == bfd_link_hash_indirect
1595 || h->root.type == bfd_link_hash_warning)
1596 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1597 }
1598
1599 eh = (struct elf_i386_link_hash_entry *) h;
1600 if (h != NULL)
1601 {
1602 /* Create the ifunc sections for static executables. If we
1603 never see an indirect function symbol nor we are building
1604 a static executable, those sections will be empty and
1605 won't appear in output. */
1606 switch (r_type)
1607 {
1608 default:
1609 break;
1610
1611 case R_386_GOTOFF:
1612 eh->gotoff_ref = 1;
1613 case R_386_32:
1614 case R_386_PC32:
1615 case R_386_PLT32:
1616 case R_386_GOT32:
1617 case R_386_GOT32X:
1618 if (htab->elf.dynobj == NULL)
1619 htab->elf.dynobj = abfd;
1620 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1621 return FALSE;
1622 break;
1623 }
1624
1625 /* It is referenced by a non-shared object. */
1626 h->ref_regular = 1;
1627 h->root.non_ir_ref = 1;
1628
1629 if (h->type == STT_GNU_IFUNC)
1630 elf_tdata (info->output_bfd)->has_gnu_symbols
1631 |= elf_gnu_symbol_ifunc;
1632 }
1633
1634 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1635 symtab_hdr, sym_hashes,
1636 &r_type, GOT_UNKNOWN,
1637 rel, rel_end, h, r_symndx))
1638 return FALSE;
1639
1640 switch (r_type)
1641 {
1642 case R_386_TLS_LDM:
1643 htab->tls_ldm_got.refcount += 1;
1644 goto create_got;
1645
1646 case R_386_PLT32:
1647 /* This symbol requires a procedure linkage table entry. We
1648 actually build the entry in adjust_dynamic_symbol,
1649 because this might be a case of linking PIC code which is
1650 never referenced by a dynamic object, in which case we
1651 don't need to generate a procedure linkage table entry
1652 after all. */
1653
1654 /* If this is a local symbol, we resolve it directly without
1655 creating a procedure linkage table entry. */
1656 if (h == NULL)
1657 continue;
1658
1659 eh->has_got_reloc = 1;
1660 h->needs_plt = 1;
1661 h->plt.refcount += 1;
1662 break;
1663
1664 case R_386_SIZE32:
1665 size_reloc = TRUE;
1666 goto do_size;
1667
1668 case R_386_TLS_IE_32:
1669 case R_386_TLS_IE:
1670 case R_386_TLS_GOTIE:
1671 if (!bfd_link_executable (info))
1672 info->flags |= DF_STATIC_TLS;
1673 /* Fall through */
1674
1675 case R_386_GOT32:
1676 case R_386_GOT32X:
1677 case R_386_TLS_GD:
1678 case R_386_TLS_GOTDESC:
1679 case R_386_TLS_DESC_CALL:
1680 /* This symbol requires a global offset table entry. */
1681 {
1682 int tls_type, old_tls_type;
1683
1684 switch (r_type)
1685 {
1686 default:
1687 case R_386_GOT32:
1688 case R_386_GOT32X:
1689 tls_type = GOT_NORMAL;
1690 break;
1691 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1692 case R_386_TLS_GOTDESC:
1693 case R_386_TLS_DESC_CALL:
1694 tls_type = GOT_TLS_GDESC; break;
1695 case R_386_TLS_IE_32:
1696 if (ELF32_R_TYPE (rel->r_info) == r_type)
1697 tls_type = GOT_TLS_IE_NEG;
1698 else
1699 /* If this is a GD->IE transition, we may use either of
1700 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1701 tls_type = GOT_TLS_IE;
1702 break;
1703 case R_386_TLS_IE:
1704 case R_386_TLS_GOTIE:
1705 tls_type = GOT_TLS_IE_POS; break;
1706 }
1707
1708 if (h != NULL)
1709 {
1710 h->got.refcount += 1;
1711 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1712 }
1713 else
1714 {
1715 bfd_signed_vma *local_got_refcounts;
1716
1717 /* This is a global offset table entry for a local symbol. */
1718 local_got_refcounts = elf_local_got_refcounts (abfd);
1719 if (local_got_refcounts == NULL)
1720 {
1721 bfd_size_type size;
1722
1723 size = symtab_hdr->sh_info;
1724 size *= (sizeof (bfd_signed_vma)
1725 + sizeof (bfd_vma) + sizeof(char));
1726 local_got_refcounts = (bfd_signed_vma *)
1727 bfd_zalloc (abfd, size);
1728 if (local_got_refcounts == NULL)
1729 return FALSE;
1730 elf_local_got_refcounts (abfd) = local_got_refcounts;
1731 elf_i386_local_tlsdesc_gotent (abfd)
1732 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1733 elf_i386_local_got_tls_type (abfd)
1734 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1735 }
1736 local_got_refcounts[r_symndx] += 1;
1737 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1738 }
1739
1740 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1741 tls_type |= old_tls_type;
1742 /* If a TLS symbol is accessed using IE at least once,
1743 there is no point to use dynamic model for it. */
1744 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1745 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1746 || (tls_type & GOT_TLS_IE) == 0))
1747 {
1748 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1749 tls_type = old_tls_type;
1750 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1751 && GOT_TLS_GD_ANY_P (tls_type))
1752 tls_type |= old_tls_type;
1753 else
1754 {
1755 if (h)
1756 name = h->root.root.string;
1757 else
1758 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1759 NULL);
1760 (*_bfd_error_handler)
1761 (_("%B: `%s' accessed both as normal and "
1762 "thread local symbol"),
1763 abfd, name);
1764 bfd_set_error (bfd_error_bad_value);
1765 return FALSE;
1766 }
1767 }
1768
1769 if (old_tls_type != tls_type)
1770 {
1771 if (h != NULL)
1772 elf_i386_hash_entry (h)->tls_type = tls_type;
1773 else
1774 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1775 }
1776 }
1777 /* Fall through */
1778
1779 case R_386_GOTOFF:
1780 case R_386_GOTPC:
1781 create_got:
1782 if (htab->elf.sgot == NULL)
1783 {
1784 if (htab->elf.dynobj == NULL)
1785 htab->elf.dynobj = abfd;
1786 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1787 return FALSE;
1788 }
1789 if (r_type != R_386_TLS_IE)
1790 {
1791 if (eh != NULL)
1792 eh->has_got_reloc = 1;
1793 break;
1794 }
1795 /* Fall through */
1796
1797 case R_386_TLS_LE_32:
1798 case R_386_TLS_LE:
1799 if (eh != NULL)
1800 eh->has_got_reloc = 1;
1801 if (bfd_link_executable (info))
1802 break;
1803 info->flags |= DF_STATIC_TLS;
1804 goto do_relocation;
1805
1806 case R_386_32:
1807 case R_386_PC32:
1808 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1809 eh->has_non_got_reloc = 1;
1810 do_relocation:
1811 if (h != NULL && bfd_link_executable (info))
1812 {
1813 /* If this reloc is in a read-only section, we might
1814 need a copy reloc. We can't check reliably at this
1815 stage whether the section is read-only, as input
1816 sections have not yet been mapped to output sections.
1817 Tentatively set the flag for now, and correct in
1818 adjust_dynamic_symbol. */
1819 h->non_got_ref = 1;
1820
1821 /* We may need a .plt entry if the function this reloc
1822 refers to is in a shared lib. */
1823 h->plt.refcount += 1;
1824 if (r_type == R_386_PC32)
1825 {
1826 /* Since something like ".long foo - ." may be used
1827 as pointer, make sure that PLT is used if foo is
1828 a function defined in a shared library. */
1829 if ((sec->flags & SEC_CODE) == 0)
1830 h->pointer_equality_needed = 1;
1831 }
1832 else
1833 {
1834 h->pointer_equality_needed = 1;
1835 /* R_386_32 can be resolved at run-time. */
1836 if (r_type == R_386_32
1837 && (sec->flags & SEC_READONLY) == 0)
1838 eh->func_pointer_refcount += 1;
1839 }
1840 }
1841
1842 size_reloc = FALSE;
1843 do_size:
1844 /* If we are creating a shared library, and this is a reloc
1845 against a global symbol, or a non PC relative reloc
1846 against a local symbol, then we need to copy the reloc
1847 into the shared library. However, if we are linking with
1848 -Bsymbolic, we do not need to copy a reloc against a
1849 global symbol which is defined in an object we are
1850 including in the link (i.e., DEF_REGULAR is set). At
1851 this point we have not seen all the input files, so it is
1852 possible that DEF_REGULAR is not set now but will be set
1853 later (it is never cleared). In case of a weak definition,
1854 DEF_REGULAR may be cleared later by a strong definition in
1855 a shared library. We account for that possibility below by
1856 storing information in the relocs_copied field of the hash
1857 table entry. A similar situation occurs when creating
1858 shared libraries and symbol visibility changes render the
1859 symbol local.
1860
1861 If on the other hand, we are creating an executable, we
1862 may need to keep relocations for symbols satisfied by a
1863 dynamic library if we manage to avoid copy relocs for the
1864 symbol. */
1865 if ((bfd_link_pic (info)
1866 && (sec->flags & SEC_ALLOC) != 0
1867 && (r_type != R_386_PC32
1868 || (h != NULL
1869 && (! SYMBOLIC_BIND (info, h)
1870 || h->root.type == bfd_link_hash_defweak
1871 || !h->def_regular))))
1872 || (ELIMINATE_COPY_RELOCS
1873 && !bfd_link_pic (info)
1874 && (sec->flags & SEC_ALLOC) != 0
1875 && h != NULL
1876 && (h->root.type == bfd_link_hash_defweak
1877 || !h->def_regular)))
1878 {
1879 struct elf_dyn_relocs *p;
1880 struct elf_dyn_relocs **head;
1881
1882 /* We must copy these reloc types into the output file.
1883 Create a reloc section in dynobj and make room for
1884 this reloc. */
1885 if (sreloc == NULL)
1886 {
1887 if (htab->elf.dynobj == NULL)
1888 htab->elf.dynobj = abfd;
1889
1890 sreloc = _bfd_elf_make_dynamic_reloc_section
1891 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1892
1893 if (sreloc == NULL)
1894 return FALSE;
1895 }
1896
1897 /* If this is a global symbol, we count the number of
1898 relocations we need for this symbol. */
1899 if (h != NULL)
1900 {
1901 head = &eh->dyn_relocs;
1902 }
1903 else
1904 {
1905 /* Track dynamic relocs needed for local syms too.
1906 We really need local syms available to do this
1907 easily. Oh well. */
1908 void **vpp;
1909 asection *s;
1910
1911 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1912 abfd, r_symndx);
1913 if (isym == NULL)
1914 return FALSE;
1915
1916 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1917 if (s == NULL)
1918 s = sec;
1919
1920 vpp = &elf_section_data (s)->local_dynrel;
1921 head = (struct elf_dyn_relocs **)vpp;
1922 }
1923
1924 p = *head;
1925 if (p == NULL || p->sec != sec)
1926 {
1927 bfd_size_type amt = sizeof *p;
1928 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1929 amt);
1930 if (p == NULL)
1931 return FALSE;
1932 p->next = *head;
1933 *head = p;
1934 p->sec = sec;
1935 p->count = 0;
1936 p->pc_count = 0;
1937 }
1938
1939 p->count += 1;
1940 /* Count size relocation as PC-relative relocation. */
1941 if (r_type == R_386_PC32 || size_reloc)
1942 p->pc_count += 1;
1943 }
1944 break;
1945
1946 /* This relocation describes the C++ object vtable hierarchy.
1947 Reconstruct it for later use during GC. */
1948 case R_386_GNU_VTINHERIT:
1949 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1950 return FALSE;
1951 break;
1952
1953 /* This relocation describes which C++ vtable entries are actually
1954 used. Record for later use during GC. */
1955 case R_386_GNU_VTENTRY:
1956 BFD_ASSERT (h != NULL);
1957 if (h != NULL
1958 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1959 return FALSE;
1960 break;
1961
1962 default:
1963 break;
1964 }
1965
1966 if (use_plt_got
1967 && h != NULL
1968 && h->plt.refcount > 0
1969 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1970 || h->got.refcount > 0)
1971 && htab->plt_got == NULL)
1972 {
1973 /* Create the GOT procedure linkage table. */
1974 unsigned int plt_got_align;
1975 const struct elf_backend_data *bed;
1976
1977 bed = get_elf_backend_data (info->output_bfd);
1978 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1979 && (sizeof (elf_i386_got_plt_entry)
1980 == sizeof (elf_i386_pic_got_plt_entry)));
1981 plt_got_align = 3;
1982
1983 if (htab->elf.dynobj == NULL)
1984 htab->elf.dynobj = abfd;
1985 htab->plt_got
1986 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1987 ".plt.got",
1988 (bed->dynamic_sec_flags
1989 | SEC_ALLOC
1990 | SEC_CODE
1991 | SEC_LOAD
1992 | SEC_READONLY));
1993 if (htab->plt_got == NULL
1994 || !bfd_set_section_alignment (htab->elf.dynobj,
1995 htab->plt_got,
1996 plt_got_align))
1997 return FALSE;
1998 }
1999
2000 if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
2001 && (h == NULL || h->type != STT_GNU_IFUNC))
2002 sec->need_convert_load = 1;
2003 }
2004
2005 return TRUE;
2006 }
2007
2008 /* Return the section that should be marked against GC for a given
2009 relocation. */
2010
2011 static asection *
2012 elf_i386_gc_mark_hook (asection *sec,
2013 struct bfd_link_info *info,
2014 Elf_Internal_Rela *rel,
2015 struct elf_link_hash_entry *h,
2016 Elf_Internal_Sym *sym)
2017 {
2018 if (h != NULL)
2019 switch (ELF32_R_TYPE (rel->r_info))
2020 {
2021 case R_386_GNU_VTINHERIT:
2022 case R_386_GNU_VTENTRY:
2023 return NULL;
2024 }
2025
2026 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2027 }
2028
2029 /* Update the got entry reference counts for the section being removed. */
2030
2031 static bfd_boolean
2032 elf_i386_gc_sweep_hook (bfd *abfd,
2033 struct bfd_link_info *info,
2034 asection *sec,
2035 const Elf_Internal_Rela *relocs)
2036 {
2037 struct elf_i386_link_hash_table *htab;
2038 Elf_Internal_Shdr *symtab_hdr;
2039 struct elf_link_hash_entry **sym_hashes;
2040 bfd_signed_vma *local_got_refcounts;
2041 const Elf_Internal_Rela *rel, *relend;
2042
2043 if (bfd_link_relocatable (info))
2044 return TRUE;
2045
2046 htab = elf_i386_hash_table (info);
2047 if (htab == NULL)
2048 return FALSE;
2049
2050 elf_section_data (sec)->local_dynrel = NULL;
2051
2052 symtab_hdr = &elf_symtab_hdr (abfd);
2053 sym_hashes = elf_sym_hashes (abfd);
2054 local_got_refcounts = elf_local_got_refcounts (abfd);
2055
2056 relend = relocs + sec->reloc_count;
2057 for (rel = relocs; rel < relend; rel++)
2058 {
2059 unsigned long r_symndx;
2060 unsigned int r_type;
2061 struct elf_link_hash_entry *h = NULL;
2062
2063 r_symndx = ELF32_R_SYM (rel->r_info);
2064 if (r_symndx >= symtab_hdr->sh_info)
2065 {
2066 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2067 while (h->root.type == bfd_link_hash_indirect
2068 || h->root.type == bfd_link_hash_warning)
2069 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2070 }
2071 else
2072 {
2073 /* A local symbol. */
2074 Elf_Internal_Sym *isym;
2075
2076 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2077 abfd, r_symndx);
2078
2079 /* Check relocation against local STT_GNU_IFUNC symbol. */
2080 if (isym != NULL
2081 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2082 {
2083 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2084 if (h == NULL)
2085 abort ();
2086 }
2087 }
2088
2089 if (h)
2090 {
2091 struct elf_i386_link_hash_entry *eh;
2092 struct elf_dyn_relocs **pp;
2093 struct elf_dyn_relocs *p;
2094
2095 eh = (struct elf_i386_link_hash_entry *) h;
2096 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2097 if (p->sec == sec)
2098 {
2099 /* Everything must go for SEC. */
2100 *pp = p->next;
2101 break;
2102 }
2103 }
2104
2105 r_type = ELF32_R_TYPE (rel->r_info);
2106 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2107 symtab_hdr, sym_hashes,
2108 &r_type, GOT_UNKNOWN,
2109 rel, relend, h, r_symndx))
2110 return FALSE;
2111
2112 switch (r_type)
2113 {
2114 case R_386_TLS_LDM:
2115 if (htab->tls_ldm_got.refcount > 0)
2116 htab->tls_ldm_got.refcount -= 1;
2117 break;
2118
2119 case R_386_TLS_GD:
2120 case R_386_TLS_GOTDESC:
2121 case R_386_TLS_DESC_CALL:
2122 case R_386_TLS_IE_32:
2123 case R_386_TLS_IE:
2124 case R_386_TLS_GOTIE:
2125 case R_386_GOT32:
2126 case R_386_GOT32X:
2127 if (h != NULL)
2128 {
2129 if (h->got.refcount > 0)
2130 h->got.refcount -= 1;
2131 if (h->type == STT_GNU_IFUNC)
2132 {
2133 if (h->plt.refcount > 0)
2134 h->plt.refcount -= 1;
2135 }
2136 }
2137 else if (local_got_refcounts != NULL)
2138 {
2139 if (local_got_refcounts[r_symndx] > 0)
2140 local_got_refcounts[r_symndx] -= 1;
2141 }
2142 break;
2143
2144 case R_386_32:
2145 case R_386_PC32:
2146 case R_386_SIZE32:
2147 if (bfd_link_pic (info)
2148 && (h == NULL || h->type != STT_GNU_IFUNC))
2149 break;
2150 /* Fall through */
2151
2152 case R_386_PLT32:
2153 if (h != NULL)
2154 {
2155 if (h->plt.refcount > 0)
2156 h->plt.refcount -= 1;
2157 if (r_type == R_386_32
2158 && (sec->flags & SEC_READONLY) == 0)
2159 {
2160 struct elf_i386_link_hash_entry *eh
2161 = (struct elf_i386_link_hash_entry *) h;
2162 if (eh->func_pointer_refcount > 0)
2163 eh->func_pointer_refcount -= 1;
2164 }
2165 }
2166 break;
2167
2168 case R_386_GOTOFF:
2169 if (h != NULL && h->type == STT_GNU_IFUNC)
2170 {
2171 if (h->got.refcount > 0)
2172 h->got.refcount -= 1;
2173 if (h->plt.refcount > 0)
2174 h->plt.refcount -= 1;
2175 }
2176 break;
2177
2178 default:
2179 break;
2180 }
2181 }
2182
2183 return TRUE;
2184 }
2185
2186 /* Remove undefined weak symbol from the dynamic symbol table if it
2187 is resolved to 0. */
2188
2189 static bfd_boolean
2190 elf_i386_fixup_symbol (struct bfd_link_info *info,
2191 struct elf_link_hash_entry *h)
2192 {
2193 if (h->dynindx != -1
2194 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2195 elf_i386_hash_entry (h)))
2196 {
2197 h->dynindx = -1;
2198 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2199 h->dynstr_index);
2200 }
2201 return TRUE;
2202 }
2203
2204 /* Adjust a symbol defined by a dynamic object and referenced by a
2205 regular object. The current definition is in some section of the
2206 dynamic object, but we're not including those sections. We have to
2207 change the definition to something the rest of the link can
2208 understand. */
2209
2210 static bfd_boolean
2211 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2212 struct elf_link_hash_entry *h)
2213 {
2214 struct elf_i386_link_hash_table *htab;
2215 asection *s;
2216 struct elf_i386_link_hash_entry *eh;
2217 struct elf_dyn_relocs *p;
2218
2219 /* STT_GNU_IFUNC symbol must go through PLT. */
2220 if (h->type == STT_GNU_IFUNC)
2221 {
2222 /* All local STT_GNU_IFUNC references must be treate as local
2223 calls via local PLT. */
2224 if (h->ref_regular
2225 && SYMBOL_CALLS_LOCAL (info, h))
2226 {
2227 bfd_size_type pc_count = 0, count = 0;
2228 struct elf_dyn_relocs **pp;
2229
2230 eh = (struct elf_i386_link_hash_entry *) h;
2231 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2232 {
2233 pc_count += p->pc_count;
2234 p->count -= p->pc_count;
2235 p->pc_count = 0;
2236 count += p->count;
2237 if (p->count == 0)
2238 *pp = p->next;
2239 else
2240 pp = &p->next;
2241 }
2242
2243 if (pc_count || count)
2244 {
2245 h->needs_plt = 1;
2246 h->non_got_ref = 1;
2247 if (h->plt.refcount <= 0)
2248 h->plt.refcount = 1;
2249 else
2250 h->plt.refcount += 1;
2251 }
2252 }
2253
2254 if (h->plt.refcount <= 0)
2255 {
2256 h->plt.offset = (bfd_vma) -1;
2257 h->needs_plt = 0;
2258 }
2259 return TRUE;
2260 }
2261
2262 /* If this is a function, put it in the procedure linkage table. We
2263 will fill in the contents of the procedure linkage table later,
2264 when we know the address of the .got section. */
2265 if (h->type == STT_FUNC
2266 || h->needs_plt)
2267 {
2268 if (h->plt.refcount <= 0
2269 || SYMBOL_CALLS_LOCAL (info, h)
2270 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2271 && h->root.type == bfd_link_hash_undefweak))
2272 {
2273 /* This case can occur if we saw a PLT32 reloc in an input
2274 file, but the symbol was never referred to by a dynamic
2275 object, or if all references were garbage collected. In
2276 such a case, we don't actually need to build a procedure
2277 linkage table, and we can just do a PC32 reloc instead. */
2278 h->plt.offset = (bfd_vma) -1;
2279 h->needs_plt = 0;
2280 }
2281
2282 return TRUE;
2283 }
2284 else
2285 /* It's possible that we incorrectly decided a .plt reloc was
2286 needed for an R_386_PC32 reloc to a non-function sym in
2287 check_relocs. We can't decide accurately between function and
2288 non-function syms in check-relocs; Objects loaded later in
2289 the link may change h->type. So fix it now. */
2290 h->plt.offset = (bfd_vma) -1;
2291
2292 /* If this is a weak symbol, and there is a real definition, the
2293 processor independent code will have arranged for us to see the
2294 real definition first, and we can just use the same value. */
2295 if (h->u.weakdef != NULL)
2296 {
2297 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2298 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2299 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2300 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2301 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2302 h->non_got_ref = h->u.weakdef->non_got_ref;
2303 return TRUE;
2304 }
2305
2306 /* This is a reference to a symbol defined by a dynamic object which
2307 is not a function. */
2308
2309 /* If we are creating a shared library, we must presume that the
2310 only references to the symbol are via the global offset table.
2311 For such cases we need not do anything here; the relocations will
2312 be handled correctly by relocate_section. */
2313 if (!bfd_link_executable (info))
2314 return TRUE;
2315
2316 /* If there are no references to this symbol that do not use the
2317 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2318 reloc. */
2319 eh = (struct elf_i386_link_hash_entry *) h;
2320 if (!h->non_got_ref && !eh->gotoff_ref)
2321 return TRUE;
2322
2323 /* If -z nocopyreloc was given, we won't generate them either. */
2324 if (info->nocopyreloc)
2325 {
2326 h->non_got_ref = 0;
2327 return TRUE;
2328 }
2329
2330 htab = elf_i386_hash_table (info);
2331 if (htab == NULL)
2332 return FALSE;
2333
2334 /* If there aren't any dynamic relocs in read-only sections nor
2335 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2336 avoid the copy reloc. This doesn't work on VxWorks, where we can
2337 not have dynamic relocations (other than copy and jump slot
2338 relocations) in an executable. */
2339 if (ELIMINATE_COPY_RELOCS
2340 && !eh->gotoff_ref
2341 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2342 {
2343 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2344 {
2345 s = p->sec->output_section;
2346 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2347 break;
2348 }
2349
2350 if (p == NULL)
2351 {
2352 h->non_got_ref = 0;
2353 return TRUE;
2354 }
2355 }
2356
2357 /* We must allocate the symbol in our .dynbss section, which will
2358 become part of the .bss section of the executable. There will be
2359 an entry for this symbol in the .dynsym section. The dynamic
2360 object will contain position independent code, so all references
2361 from the dynamic object to this symbol will go through the global
2362 offset table. The dynamic linker will use the .dynsym entry to
2363 determine the address it must put in the global offset table, so
2364 both the dynamic object and the regular object will refer to the
2365 same memory location for the variable. */
2366
2367 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2368 copy the initial value out of the dynamic object and into the
2369 runtime process image. */
2370 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2371 {
2372 htab->srelbss->size += sizeof (Elf32_External_Rel);
2373 h->needs_copy = 1;
2374 }
2375
2376 s = htab->sdynbss;
2377
2378 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2379 }
2380
2381 /* Allocate space in .plt, .got and associated reloc sections for
2382 dynamic relocs. */
2383
2384 static bfd_boolean
2385 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2386 {
2387 struct bfd_link_info *info;
2388 struct elf_i386_link_hash_table *htab;
2389 struct elf_i386_link_hash_entry *eh;
2390 struct elf_dyn_relocs *p;
2391 unsigned plt_entry_size;
2392 bfd_boolean resolved_to_zero;
2393
2394 if (h->root.type == bfd_link_hash_indirect)
2395 return TRUE;
2396
2397 eh = (struct elf_i386_link_hash_entry *) h;
2398
2399 info = (struct bfd_link_info *) inf;
2400 htab = elf_i386_hash_table (info);
2401 if (htab == NULL)
2402 return FALSE;
2403
2404 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2405
2406 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
2407
2408 /* Clear the reference count of function pointer relocations if
2409 symbol isn't a normal function. */
2410 if (h->type != STT_FUNC)
2411 eh->func_pointer_refcount = 0;
2412
2413 /* We can't use the GOT PLT if pointer equality is needed since
2414 finish_dynamic_symbol won't clear symbol value and the dynamic
2415 linker won't update the GOT slot. We will get into an infinite
2416 loop at run-time. */
2417 if (htab->plt_got != NULL
2418 && h->type != STT_GNU_IFUNC
2419 && !h->pointer_equality_needed
2420 && h->plt.refcount > 0
2421 && h->got.refcount > 0)
2422 {
2423 /* Don't use the regular PLT if there are both GOT and GOTPLT
2424 reloctions. */
2425 h->plt.offset = (bfd_vma) -1;
2426
2427 /* Use the GOT PLT. */
2428 eh->plt_got.refcount = 1;
2429 }
2430
2431 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2432 here if it is defined and referenced in a non-shared object. */
2433 if (h->type == STT_GNU_IFUNC
2434 && h->def_regular)
2435 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2436 plt_entry_size,
2437 plt_entry_size, 4);
2438 /* Don't create the PLT entry if there are only function pointer
2439 relocations which can be resolved at run-time. */
2440 else if (htab->elf.dynamic_sections_created
2441 && (h->plt.refcount > eh->func_pointer_refcount
2442 || eh->plt_got.refcount > 0))
2443 {
2444 bfd_boolean use_plt_got;
2445
2446 /* Clear the reference count of function pointer relocations
2447 if PLT is used. */
2448 eh->func_pointer_refcount = 0;
2449
2450 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2451 {
2452 /* Don't use the regular PLT for DF_BIND_NOW. */
2453 h->plt.offset = (bfd_vma) -1;
2454
2455 /* Use the GOT PLT. */
2456 h->got.refcount = 1;
2457 eh->plt_got.refcount = 1;
2458 }
2459
2460 use_plt_got = eh->plt_got.refcount > 0;
2461
2462 /* Make sure this symbol is output as a dynamic symbol.
2463 Undefined weak syms won't yet be marked as dynamic. */
2464 if (h->dynindx == -1
2465 && !h->forced_local
2466 && !resolved_to_zero)
2467 {
2468 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2469 return FALSE;
2470 }
2471
2472 if (bfd_link_pic (info)
2473 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2474 {
2475 asection *s = htab->elf.splt;
2476 asection *got_s = htab->plt_got;
2477
2478 /* If this is the first .plt entry, make room for the special
2479 first entry. The .plt section is used by prelink to undo
2480 prelinking for dynamic relocations. */
2481 if (s->size == 0)
2482 s->size = plt_entry_size;
2483
2484 if (use_plt_got)
2485 eh->plt_got.offset = got_s->size;
2486 else
2487 h->plt.offset = s->size;
2488
2489 /* If this symbol is not defined in a regular file, and we are
2490 not generating a shared library, then set the symbol to this
2491 location in the .plt. This is required to make function
2492 pointers compare as equal between the normal executable and
2493 the shared library. */
2494 if (! bfd_link_pic (info)
2495 && !h->def_regular)
2496 {
2497 if (use_plt_got)
2498 {
2499 /* We need to make a call to the entry of the GOT PLT
2500 instead of regular PLT entry. */
2501 h->root.u.def.section = got_s;
2502 h->root.u.def.value = eh->plt_got.offset;
2503 }
2504 else
2505 {
2506 h->root.u.def.section = s;
2507 h->root.u.def.value = h->plt.offset;
2508 }
2509 }
2510
2511 /* Make room for this entry. */
2512 if (use_plt_got)
2513 got_s->size += sizeof (elf_i386_got_plt_entry);
2514 else
2515 {
2516 s->size += plt_entry_size;
2517
2518 /* We also need to make an entry in the .got.plt section,
2519 which will be placed in the .got section by the linker
2520 script. */
2521 htab->elf.sgotplt->size += 4;
2522
2523 /* There should be no PLT relocation against resolved
2524 undefined weak symbol in executable. */
2525 if (!resolved_to_zero)
2526 {
2527 /* We also need to make an entry in the .rel.plt
2528 section. */
2529 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2530 htab->elf.srelplt->reloc_count++;
2531 }
2532 }
2533
2534 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2535 && !bfd_link_pic (info))
2536 {
2537 /* VxWorks has a second set of relocations for each PLT entry
2538 in executables. They go in a separate relocation section,
2539 which is processed by the kernel loader. */
2540
2541 /* There are two relocations for the initial PLT entry: an
2542 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2543 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2544
2545 if (h->plt.offset == plt_entry_size)
2546 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2547
2548 /* There are two extra relocations for each subsequent PLT entry:
2549 an R_386_32 relocation for the GOT entry, and an R_386_32
2550 relocation for the PLT entry. */
2551
2552 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2553 }
2554 }
2555 else
2556 {
2557 eh->plt_got.offset = (bfd_vma) -1;
2558 h->plt.offset = (bfd_vma) -1;
2559 h->needs_plt = 0;
2560 }
2561 }
2562 else
2563 {
2564 eh->plt_got.offset = (bfd_vma) -1;
2565 h->plt.offset = (bfd_vma) -1;
2566 h->needs_plt = 0;
2567 }
2568
2569 eh->tlsdesc_got = (bfd_vma) -1;
2570
2571 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2572 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2573 if (h->got.refcount > 0
2574 && bfd_link_executable (info)
2575 && h->dynindx == -1
2576 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2577 h->got.offset = (bfd_vma) -1;
2578 else if (h->got.refcount > 0)
2579 {
2580 asection *s;
2581 bfd_boolean dyn;
2582 int tls_type = elf_i386_hash_entry(h)->tls_type;
2583
2584 /* Make sure this symbol is output as a dynamic symbol.
2585 Undefined weak syms won't yet be marked as dynamic. */
2586 if (h->dynindx == -1
2587 && !h->forced_local
2588 && !resolved_to_zero)
2589 {
2590 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2591 return FALSE;
2592 }
2593
2594 s = htab->elf.sgot;
2595 if (GOT_TLS_GDESC_P (tls_type))
2596 {
2597 eh->tlsdesc_got = htab->elf.sgotplt->size
2598 - elf_i386_compute_jump_table_size (htab);
2599 htab->elf.sgotplt->size += 8;
2600 h->got.offset = (bfd_vma) -2;
2601 }
2602 if (! GOT_TLS_GDESC_P (tls_type)
2603 || GOT_TLS_GD_P (tls_type))
2604 {
2605 h->got.offset = s->size;
2606 s->size += 4;
2607 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2608 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2609 s->size += 4;
2610 }
2611 dyn = htab->elf.dynamic_sections_created;
2612 /* R_386_TLS_IE_32 needs one dynamic relocation,
2613 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2614 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2615 need two), R_386_TLS_GD needs one if local symbol and two if
2616 global. No dynamic relocation against resolved undefined weak
2617 symbol in executable. */
2618 if (tls_type == GOT_TLS_IE_BOTH)
2619 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2620 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2621 || (tls_type & GOT_TLS_IE))
2622 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2623 else if (GOT_TLS_GD_P (tls_type))
2624 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2625 else if (! GOT_TLS_GDESC_P (tls_type)
2626 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2627 && !resolved_to_zero)
2628 || h->root.type != bfd_link_hash_undefweak)
2629 && (bfd_link_pic (info)
2630 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2631 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2632 if (GOT_TLS_GDESC_P (tls_type))
2633 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2634 }
2635 else
2636 h->got.offset = (bfd_vma) -1;
2637
2638 if (eh->dyn_relocs == NULL)
2639 return TRUE;
2640
2641 /* In the shared -Bsymbolic case, discard space allocated for
2642 dynamic pc-relative relocs against symbols which turn out to be
2643 defined in regular objects. For the normal shared case, discard
2644 space for pc-relative relocs that have become local due to symbol
2645 visibility changes. */
2646
2647 if (bfd_link_pic (info))
2648 {
2649 /* The only reloc that uses pc_count is R_386_PC32, which will
2650 appear on a call or on something like ".long foo - .". We
2651 want calls to protected symbols to resolve directly to the
2652 function rather than going via the plt. If people want
2653 function pointer comparisons to work as expected then they
2654 should avoid writing assembly like ".long foo - .". */
2655 if (SYMBOL_CALLS_LOCAL (info, h))
2656 {
2657 struct elf_dyn_relocs **pp;
2658
2659 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2660 {
2661 p->count -= p->pc_count;
2662 p->pc_count = 0;
2663 if (p->count == 0)
2664 *pp = p->next;
2665 else
2666 pp = &p->next;
2667 }
2668 }
2669
2670 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2671 {
2672 struct elf_dyn_relocs **pp;
2673 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2674 {
2675 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2676 *pp = p->next;
2677 else
2678 pp = &p->next;
2679 }
2680 }
2681
2682 /* Also discard relocs on undefined weak syms with non-default
2683 visibility or in PIE. */
2684 if (eh->dyn_relocs != NULL
2685 && h->root.type == bfd_link_hash_undefweak)
2686 {
2687 /* Undefined weak symbol is never bound locally in shared
2688 library. */
2689 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2690 || resolved_to_zero)
2691 {
2692 if (h->non_got_ref)
2693 {
2694 /* Keep dynamic non-GOT/non-PLT relocation so that we
2695 can branch to 0 without PLT. */
2696 struct elf_dyn_relocs **pp;
2697
2698 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2699 if (p->pc_count == 0)
2700 *pp = p->next;
2701 else
2702 {
2703 /* Remove non-R_386_PC32 relocation. */
2704 p->count = p->pc_count;
2705 pp = &p->next;
2706 }
2707
2708 if (eh->dyn_relocs != NULL)
2709 {
2710 /* Make sure undefined weak symbols are output
2711 as dynamic symbols in PIEs for dynamic non-GOT
2712 non-PLT reloations. */
2713 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2714 return FALSE;
2715 }
2716 }
2717 else
2718 eh->dyn_relocs = NULL;
2719 }
2720 else if (h->dynindx == -1
2721 && !h->forced_local)
2722 {
2723 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2724 return FALSE;
2725 }
2726 }
2727 }
2728 else if (ELIMINATE_COPY_RELOCS)
2729 {
2730 /* For the non-shared case, discard space for relocs against
2731 symbols which turn out to need copy relocs or are not
2732 dynamic. Keep dynamic relocations for run-time function
2733 pointer initialization. */
2734
2735 if ((!h->non_got_ref
2736 || eh->func_pointer_refcount > 0
2737 || (h->root.type == bfd_link_hash_undefweak
2738 && !resolved_to_zero))
2739 && ((h->def_dynamic
2740 && !h->def_regular)
2741 || (htab->elf.dynamic_sections_created
2742 && (h->root.type == bfd_link_hash_undefweak
2743 || h->root.type == bfd_link_hash_undefined))))
2744 {
2745 /* Make sure this symbol is output as a dynamic symbol.
2746 Undefined weak syms won't yet be marked as dynamic. */
2747 if (h->dynindx == -1
2748 && !h->forced_local
2749 && !resolved_to_zero)
2750 {
2751 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2752 return FALSE;
2753 }
2754
2755 /* If that succeeded, we know we'll be keeping all the
2756 relocs. */
2757 if (h->dynindx != -1)
2758 goto keep;
2759 }
2760
2761 eh->dyn_relocs = NULL;
2762 eh->func_pointer_refcount = 0;
2763
2764 keep: ;
2765 }
2766
2767 /* Finally, allocate space. */
2768 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2769 {
2770 asection *sreloc;
2771
2772 sreloc = elf_section_data (p->sec)->sreloc;
2773
2774 BFD_ASSERT (sreloc != NULL);
2775 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2776 }
2777
2778 return TRUE;
2779 }
2780
2781 /* Allocate space in .plt, .got and associated reloc sections for
2782 local dynamic relocs. */
2783
2784 static bfd_boolean
2785 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2786 {
2787 struct elf_link_hash_entry *h
2788 = (struct elf_link_hash_entry *) *slot;
2789
2790 if (h->type != STT_GNU_IFUNC
2791 || !h->def_regular
2792 || !h->ref_regular
2793 || !h->forced_local
2794 || h->root.type != bfd_link_hash_defined)
2795 abort ();
2796
2797 return elf_i386_allocate_dynrelocs (h, inf);
2798 }
2799
2800 /* Find any dynamic relocs that apply to read-only sections. */
2801
2802 static bfd_boolean
2803 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2804 {
2805 struct elf_i386_link_hash_entry *eh;
2806 struct elf_dyn_relocs *p;
2807
2808 /* Skip local IFUNC symbols. */
2809 if (h->forced_local && h->type == STT_GNU_IFUNC)
2810 return TRUE;
2811
2812 eh = (struct elf_i386_link_hash_entry *) h;
2813 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2814 {
2815 asection *s = p->sec->output_section;
2816
2817 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2818 {
2819 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2820
2821 info->flags |= DF_TEXTREL;
2822
2823 if ((info->warn_shared_textrel && bfd_link_pic (info))
2824 || info->error_textrel)
2825 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2826 p->sec->owner, h->root.root.string,
2827 p->sec);
2828
2829 /* Not an error, just cut short the traversal. */
2830 return FALSE;
2831 }
2832 }
2833 return TRUE;
2834 }
2835
2836 /* With the local symbol, foo, we convert
2837 mov foo@GOT[(%reg1)], %reg2
2838 to
2839 lea foo[@GOTOFF(%reg1)], %reg2
2840 and convert
2841 call/jmp *foo@GOT[(%reg)]
2842 to
2843 nop call foo/jmp foo nop
2844 When PIC is false, convert
2845 test %reg1, foo@GOT[(%reg2)]
2846 to
2847 test $foo, %reg1
2848 and convert
2849 binop foo@GOT[(%reg1)], %reg2
2850 to
2851 binop $foo, %reg2
2852 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2853 instructions. */
2854
2855 static bfd_boolean
2856 elf_i386_convert_load (bfd *abfd, asection *sec,
2857 struct bfd_link_info *link_info)
2858 {
2859 Elf_Internal_Shdr *symtab_hdr;
2860 Elf_Internal_Rela *internal_relocs;
2861 Elf_Internal_Rela *irel, *irelend;
2862 bfd_byte *contents;
2863 struct elf_i386_link_hash_table *htab;
2864 bfd_boolean changed_contents;
2865 bfd_boolean changed_relocs;
2866 bfd_boolean is_pic;
2867 bfd_signed_vma *local_got_refcounts;
2868
2869 /* Don't even try to convert non-ELF outputs. */
2870 if (!is_elf_hash_table (link_info->hash))
2871 return FALSE;
2872
2873 /* Nothing to do if there is no need or no output. */
2874 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2875 || sec->need_convert_load == 0
2876 || bfd_is_abs_section (sec->output_section))
2877 return TRUE;
2878
2879 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2880
2881 /* Load the relocations for this section. */
2882 internal_relocs = (_bfd_elf_link_read_relocs
2883 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2884 link_info->keep_memory));
2885 if (internal_relocs == NULL)
2886 return FALSE;
2887
2888 htab = elf_i386_hash_table (link_info);
2889 changed_contents = FALSE;
2890 changed_relocs = FALSE;
2891 local_got_refcounts = elf_local_got_refcounts (abfd);
2892
2893 is_pic = bfd_link_pic (link_info);
2894
2895 /* Get the section contents. */
2896 if (elf_section_data (sec)->this_hdr.contents != NULL)
2897 contents = elf_section_data (sec)->this_hdr.contents;
2898 else
2899 {
2900 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2901 goto error_return;
2902 }
2903
2904 irelend = internal_relocs + sec->reloc_count;
2905 for (irel = internal_relocs; irel < irelend; irel++)
2906 {
2907 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2908 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2909 unsigned int indx;
2910 struct elf_link_hash_entry *h;
2911 unsigned int opcode;
2912 unsigned int modrm;
2913 bfd_vma roff;
2914 bfd_boolean baseless;
2915 Elf_Internal_Sym *isym;
2916 unsigned int addend;
2917 unsigned int nop;
2918 bfd_vma nop_offset;
2919 bfd_boolean to_reloc_32;
2920
2921 if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
2922 continue;
2923
2924 roff = irel->r_offset;
2925 if (roff < 2)
2926 continue;
2927
2928 /* Addend for R_386_GOT32 and R_386_GOT32X relocations must be 0. */
2929 addend = bfd_get_32 (abfd, contents + roff);
2930 if (addend != 0)
2931 continue;
2932
2933 modrm = bfd_get_8 (abfd, contents + roff - 1);
2934 baseless = (modrm & 0xc7) == 0x5;
2935
2936 if (r_type == R_386_GOT32X && baseless && is_pic)
2937 {
2938 /* For PIC, disallow R_386_GOT32X without a base register
2939 since we don't know what the GOT base is. Allow
2940 R_386_GOT32 for existing object files. */
2941 const char *name;
2942
2943 if (r_symndx < symtab_hdr->sh_info)
2944 {
2945 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
2946 r_symndx);
2947 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2948 }
2949 else
2950 {
2951 indx = r_symndx - symtab_hdr->sh_info;
2952 h = elf_sym_hashes (abfd)[indx];
2953 BFD_ASSERT (h != NULL);
2954 name = h->root.root.string;
2955 }
2956
2957 (*_bfd_error_handler)
2958 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
2959 abfd, name);
2960 goto error_return;
2961 }
2962
2963 opcode = bfd_get_8 (abfd, contents + roff - 2);
2964
2965 /* Convert mov to lea since it has been done for a while. */
2966 if (opcode != 0x8b)
2967 {
2968 /* Only convert R_386_GOT32X relocation for call, jmp or
2969 one of adc, add, and, cmp, or, sbb, sub, test, xor
2970 instructions. */
2971 if (r_type != R_386_GOT32X)
2972 continue;
2973 }
2974
2975 /* Convert to R_386_32 if PIC is false or there is no base
2976 register. */
2977 to_reloc_32 = !is_pic || baseless;
2978
2979 /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
2980 referred to by the reloc. */
2981 if (r_symndx < symtab_hdr->sh_info)
2982 {
2983 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2984 abfd, r_symndx);
2985
2986 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2987 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2988 continue;
2989
2990 h = NULL;
2991 if (opcode == 0x0ff)
2992 /* Convert "call/jmp *foo@GOT[(%reg)]". */
2993 goto convert_branch;
2994 else
2995 /* Convert "mov foo@GOT[(%reg1)], %reg2",
2996 "test %reg1, foo@GOT(%reg2)" and
2997 "binop foo@GOT[(%reg1)], %reg2". */
2998 goto convert_load;
2999 }
3000
3001 indx = r_symndx - symtab_hdr->sh_info;
3002 h = elf_sym_hashes (abfd)[indx];
3003 BFD_ASSERT (h != NULL);
3004
3005 while (h->root.type == bfd_link_hash_indirect
3006 || h->root.type == bfd_link_hash_warning)
3007 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3008
3009 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3010 if (h->type == STT_GNU_IFUNC)
3011 continue;
3012
3013 /* Undefined weak symbol is only bound locally in executable
3014 and its reference is resolved as 0. */
3015 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info,
3016 elf_i386_hash_entry (h)))
3017 {
3018 if (opcode == 0xff)
3019 {
3020 /* No direct branch to 0 for PIC. */
3021 if (is_pic)
3022 continue;
3023 else
3024 goto convert_branch;
3025 }
3026 else
3027 {
3028 /* We can convert load of address 0 to R_386_32. */
3029 to_reloc_32 = TRUE;
3030 goto convert_load;
3031 }
3032 }
3033
3034 if (opcode == 0xff)
3035 {
3036 /* We have "call/jmp *foo@GOT[(%reg)]". */
3037 if ((h->root.type == bfd_link_hash_defined
3038 || h->root.type == bfd_link_hash_defweak)
3039 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3040 {
3041 /* The function is locally defined. */
3042 convert_branch:
3043 /* Convert R_386_GOT32X to R_386_PC32. */
3044 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
3045 {
3046 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
3047 is a nop prefix. */
3048 modrm = 0xe8;
3049 nop = link_info->call_nop_byte;
3050 if (link_info->call_nop_as_suffix)
3051 {
3052 nop_offset = roff + 3;
3053 irel->r_offset -= 1;
3054 }
3055 else
3056 nop_offset = roff - 2;
3057 }
3058 else
3059 {
3060 /* Convert to "jmp foo nop". */
3061 modrm = 0xe9;
3062 nop = NOP_OPCODE;
3063 nop_offset = roff + 3;
3064 irel->r_offset -= 1;
3065 }
3066
3067 bfd_put_8 (abfd, nop, contents + nop_offset);
3068 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
3069 /* When converting to PC-relative relocation, we
3070 need to adjust addend by -4. */
3071 bfd_put_32 (abfd, -4, contents + irel->r_offset);
3072 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
3073
3074 if (h)
3075 {
3076 if (h->got.refcount > 0)
3077 h->got.refcount -= 1;
3078 }
3079 else
3080 {
3081 if (local_got_refcounts != NULL
3082 && local_got_refcounts[r_symndx] > 0)
3083 local_got_refcounts[r_symndx] -= 1;
3084 }
3085
3086 changed_contents = TRUE;
3087 changed_relocs = TRUE;
3088 }
3089 }
3090 else
3091 {
3092 /* We have "mov foo@GOT[(%re1g)], %reg2",
3093 "test %reg1, foo@GOT(%reg2)" and
3094 "binop foo@GOT[(%reg1)], %reg2".
3095
3096 Avoid optimizing _DYNAMIC since ld.so may use its
3097 link-time address. */
3098 if (h == htab->elf.hdynamic)
3099 continue;
3100
3101 /* def_regular is set by an assignment in a linker script in
3102 bfd_elf_record_link_assignment. */
3103 if ((h->def_regular
3104 || h->root.type == bfd_link_hash_defined
3105 || h->root.type == bfd_link_hash_defweak)
3106 && SYMBOL_REFERENCES_LOCAL (link_info, h))
3107 {
3108 convert_load:
3109 if (opcode == 0x8b)
3110 {
3111 if (to_reloc_32)
3112 {
3113 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
3114 "mov $foo, %reg2" with R_386_32. */
3115 r_type = R_386_32;
3116 modrm = 0xc0 | (modrm & 0x38) >> 3;
3117 bfd_put_8 (abfd, modrm, contents + roff - 1);
3118 opcode = 0xc7;
3119 }
3120 else
3121 {
3122 /* Convert "mov foo@GOT(%reg1), %reg2" to
3123 "lea foo@GOTOFF(%reg1), %reg2". */
3124 r_type = R_386_GOTOFF;
3125 opcode = 0x8d;
3126 }
3127 }
3128 else
3129 {
3130 /* Only R_386_32 is supported. */
3131 if (!to_reloc_32)
3132 continue;
3133
3134 if (opcode == 0x85)
3135 {
3136 /* Convert "test %reg1, foo@GOT(%reg2)" to
3137 "test $foo, %reg1". */
3138 modrm = 0xc0 | (modrm & 0x38) >> 3;
3139 opcode = 0xf7;
3140 }
3141 else
3142 {
3143 /* Convert "binop foo@GOT(%reg1), %reg2" to
3144 "binop $foo, %reg2". */
3145 modrm = (0xc0
3146 | (modrm & 0x38) >> 3
3147 | (opcode & 0x3c));
3148 opcode = 0x81;
3149 }
3150 bfd_put_8 (abfd, modrm, contents + roff - 1);
3151 r_type = R_386_32;
3152 }
3153
3154 bfd_put_8 (abfd, opcode, contents + roff - 2);
3155 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
3156
3157 if (h)
3158 {
3159 if (h->got.refcount > 0)
3160 h->got.refcount -= 1;
3161 }
3162 else
3163 {
3164 if (local_got_refcounts != NULL
3165 && local_got_refcounts[r_symndx] > 0)
3166 local_got_refcounts[r_symndx] -= 1;
3167 }
3168
3169 changed_contents = TRUE;
3170 changed_relocs = TRUE;
3171 }
3172 }
3173 }
3174
3175 if (contents != NULL
3176 && elf_section_data (sec)->this_hdr.contents != contents)
3177 {
3178 if (!changed_contents && !link_info->keep_memory)
3179 free (contents);
3180 else
3181 {
3182 /* Cache the section contents for elf_link_input_bfd. */
3183 elf_section_data (sec)->this_hdr.contents = contents;
3184 }
3185 }
3186
3187 if (elf_section_data (sec)->relocs != internal_relocs)
3188 {
3189 if (!changed_relocs)
3190 free (internal_relocs);
3191 else
3192 elf_section_data (sec)->relocs = internal_relocs;
3193 }
3194
3195 return TRUE;
3196
3197 error_return:
3198 if (contents != NULL
3199 && elf_section_data (sec)->this_hdr.contents != contents)
3200 free (contents);
3201 if (internal_relocs != NULL
3202 && elf_section_data (sec)->relocs != internal_relocs)
3203 free (internal_relocs);
3204 return FALSE;
3205 }
3206
3207 /* Set the sizes of the dynamic sections. */
3208
3209 static bfd_boolean
3210 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3211 {
3212 struct elf_i386_link_hash_table *htab;
3213 bfd *dynobj;
3214 asection *s;
3215 bfd_boolean relocs;
3216 bfd *ibfd;
3217
3218 htab = elf_i386_hash_table (info);
3219 if (htab == NULL)
3220 return FALSE;
3221 dynobj = htab->elf.dynobj;
3222 if (dynobj == NULL)
3223 abort ();
3224
3225 if (htab->elf.dynamic_sections_created)
3226 {
3227 /* Set the contents of the .interp section to the interpreter. */
3228 if (bfd_link_executable (info) && !info->nointerp)
3229 {
3230 s = bfd_get_linker_section (dynobj, ".interp");
3231 if (s == NULL)
3232 abort ();
3233 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
3234 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3235 htab->interp = s;
3236 }
3237 }
3238
3239 /* Set up .got offsets for local syms, and space for local dynamic
3240 relocs. */
3241 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3242 {
3243 bfd_signed_vma *local_got;
3244 bfd_signed_vma *end_local_got;
3245 char *local_tls_type;
3246 bfd_vma *local_tlsdesc_gotent;
3247 bfd_size_type locsymcount;
3248 Elf_Internal_Shdr *symtab_hdr;
3249 asection *srel;
3250
3251 if (! is_i386_elf (ibfd))
3252 continue;
3253
3254 for (s = ibfd->sections; s != NULL; s = s->next)
3255 {
3256 struct elf_dyn_relocs *p;
3257
3258 if (!elf_i386_convert_load (ibfd, s, info))
3259 return FALSE;
3260
3261 for (p = ((struct elf_dyn_relocs *)
3262 elf_section_data (s)->local_dynrel);
3263 p != NULL;
3264 p = p->next)
3265 {
3266 if (!bfd_is_abs_section (p->sec)
3267 && bfd_is_abs_section (p->sec->output_section))
3268 {
3269 /* Input section has been discarded, either because
3270 it is a copy of a linkonce section or due to
3271 linker script /DISCARD/, so we'll be discarding
3272 the relocs too. */
3273 }
3274 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3275 && strcmp (p->sec->output_section->name,
3276 ".tls_vars") == 0)
3277 {
3278 /* Relocations in vxworks .tls_vars sections are
3279 handled specially by the loader. */
3280 }
3281 else if (p->count != 0)
3282 {
3283 srel = elf_section_data (p->sec)->sreloc;
3284 srel->size += p->count * sizeof (Elf32_External_Rel);
3285 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3286 && (info->flags & DF_TEXTREL) == 0)
3287 {
3288 info->flags |= DF_TEXTREL;
3289 if ((info->warn_shared_textrel && bfd_link_pic (info))
3290 || info->error_textrel)
3291 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3292 p->sec->owner, p->sec);
3293 }
3294 }
3295 }
3296 }
3297
3298 local_got = elf_local_got_refcounts (ibfd);
3299 if (!local_got)
3300 continue;
3301
3302 symtab_hdr = &elf_symtab_hdr (ibfd);
3303 locsymcount = symtab_hdr->sh_info;
3304 end_local_got = local_got + locsymcount;
3305 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3306 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3307 s = htab->elf.sgot;
3308 srel = htab->elf.srelgot;
3309 for (; local_got < end_local_got;
3310 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3311 {
3312 *local_tlsdesc_gotent = (bfd_vma) -1;
3313 if (*local_got > 0)
3314 {
3315 if (GOT_TLS_GDESC_P (*local_tls_type))
3316 {
3317 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3318 - elf_i386_compute_jump_table_size (htab);
3319 htab->elf.sgotplt->size += 8;
3320 *local_got = (bfd_vma) -2;
3321 }
3322 if (! GOT_TLS_GDESC_P (*local_tls_type)
3323 || GOT_TLS_GD_P (*local_tls_type))
3324 {
3325 *local_got = s->size;
3326 s->size += 4;
3327 if (GOT_TLS_GD_P (*local_tls_type)
3328 || *local_tls_type == GOT_TLS_IE_BOTH)
3329 s->size += 4;
3330 }
3331 if (bfd_link_pic (info)
3332 || GOT_TLS_GD_ANY_P (*local_tls_type)
3333 || (*local_tls_type & GOT_TLS_IE))
3334 {
3335 if (*local_tls_type == GOT_TLS_IE_BOTH)
3336 srel->size += 2 * sizeof (Elf32_External_Rel);
3337 else if (GOT_TLS_GD_P (*local_tls_type)
3338 || ! GOT_TLS_GDESC_P (*local_tls_type))
3339 srel->size += sizeof (Elf32_External_Rel);
3340 if (GOT_TLS_GDESC_P (*local_tls_type))
3341 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3342 }
3343 }
3344 else
3345 *local_got = (bfd_vma) -1;
3346 }
3347 }
3348
3349 if (htab->tls_ldm_got.refcount > 0)
3350 {
3351 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3352 relocs. */
3353 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3354 htab->elf.sgot->size += 8;
3355 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3356 }
3357 else
3358 htab->tls_ldm_got.offset = -1;
3359
3360 /* Allocate global sym .plt and .got entries, and space for global
3361 sym dynamic relocs. */
3362 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3363
3364 /* Allocate .plt and .got entries, and space for local symbols. */
3365 htab_traverse (htab->loc_hash_table,
3366 elf_i386_allocate_local_dynrelocs,
3367 info);
3368
3369 /* For every jump slot reserved in the sgotplt, reloc_count is
3370 incremented. However, when we reserve space for TLS descriptors,
3371 it's not incremented, so in order to compute the space reserved
3372 for them, it suffices to multiply the reloc count by the jump
3373 slot size.
3374
3375 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3376 so that R_386_IRELATIVE entries come last. */
3377 if (htab->elf.srelplt)
3378 {
3379 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3380 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3381 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3382 }
3383 else if (htab->elf.irelplt)
3384 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3385
3386
3387 if (htab->elf.sgotplt)
3388 {
3389 /* Don't allocate .got.plt section if there are no GOT nor PLT
3390 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3391 if ((htab->elf.hgot == NULL
3392 || !htab->elf.hgot->ref_regular_nonweak)
3393 && (htab->elf.sgotplt->size
3394 == get_elf_backend_data (output_bfd)->got_header_size)
3395 && (htab->elf.splt == NULL
3396 || htab->elf.splt->size == 0)
3397 && (htab->elf.sgot == NULL
3398 || htab->elf.sgot->size == 0)
3399 && (htab->elf.iplt == NULL
3400 || htab->elf.iplt->size == 0)
3401 && (htab->elf.igotplt == NULL
3402 || htab->elf.igotplt->size == 0))
3403 htab->elf.sgotplt->size = 0;
3404 }
3405
3406
3407 if (htab->plt_eh_frame != NULL
3408 && htab->elf.splt != NULL
3409 && htab->elf.splt->size != 0
3410 && !bfd_is_abs_section (htab->elf.splt->output_section)
3411 && _bfd_elf_eh_frame_present (info))
3412 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3413
3414 /* We now have determined the sizes of the various dynamic sections.
3415 Allocate memory for them. */
3416 relocs = FALSE;
3417 for (s = dynobj->sections; s != NULL; s = s->next)
3418 {
3419 bfd_boolean strip_section = TRUE;
3420
3421 if ((s->flags & SEC_LINKER_CREATED) == 0)
3422 continue;
3423
3424 if (s == htab->elf.splt
3425 || s == htab->elf.sgot)
3426 {
3427 /* Strip this section if we don't need it; see the
3428 comment below. */
3429 /* We'd like to strip these sections if they aren't needed, but if
3430 we've exported dynamic symbols from them we must leave them.
3431 It's too late to tell BFD to get rid of the symbols. */
3432
3433 if (htab->elf.hplt != NULL)
3434 strip_section = FALSE;
3435 }
3436 else if (s == htab->elf.sgotplt
3437 || s == htab->elf.iplt
3438 || s == htab->elf.igotplt
3439 || s == htab->plt_got
3440 || s == htab->plt_eh_frame
3441 || s == htab->sdynbss)
3442 {
3443 /* Strip these too. */
3444 }
3445 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3446 {
3447 if (s->size != 0
3448 && s != htab->elf.srelplt
3449 && s != htab->srelplt2)
3450 relocs = TRUE;
3451
3452 /* We use the reloc_count field as a counter if we need
3453 to copy relocs into the output file. */
3454 s->reloc_count = 0;
3455 }
3456 else
3457 {
3458 /* It's not one of our sections, so don't allocate space. */
3459 continue;
3460 }
3461
3462 if (s->size == 0)
3463 {
3464 /* If we don't need this section, strip it from the
3465 output file. This is mostly to handle .rel.bss and
3466 .rel.plt. We must create both sections in
3467 create_dynamic_sections, because they must be created
3468 before the linker maps input sections to output
3469 sections. The linker does that before
3470 adjust_dynamic_symbol is called, and it is that
3471 function which decides whether anything needs to go
3472 into these sections. */
3473 if (strip_section)
3474 s->flags |= SEC_EXCLUDE;
3475 continue;
3476 }
3477
3478 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3479 continue;
3480
3481 /* Allocate memory for the section contents. We use bfd_zalloc
3482 here in case unused entries are not reclaimed before the
3483 section's contents are written out. This should not happen,
3484 but this way if it does, we get a R_386_NONE reloc instead
3485 of garbage. */
3486 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3487 if (s->contents == NULL)
3488 return FALSE;
3489 }
3490
3491 if (htab->plt_eh_frame != NULL
3492 && htab->plt_eh_frame->contents != NULL)
3493 {
3494 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3495 sizeof (elf_i386_eh_frame_plt));
3496 bfd_put_32 (dynobj, htab->elf.splt->size,
3497 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3498 }
3499
3500 if (htab->elf.dynamic_sections_created)
3501 {
3502 /* Add some entries to the .dynamic section. We fill in the
3503 values later, in elf_i386_finish_dynamic_sections, but we
3504 must add the entries now so that we get the correct size for
3505 the .dynamic section. The DT_DEBUG entry is filled in by the
3506 dynamic linker and used by the debugger. */
3507 #define add_dynamic_entry(TAG, VAL) \
3508 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3509
3510 if (bfd_link_executable (info))
3511 {
3512 if (!add_dynamic_entry (DT_DEBUG, 0))
3513 return FALSE;
3514 }
3515
3516 if (htab->elf.splt->size != 0)
3517 {
3518 /* DT_PLTGOT is used by prelink even if there is no PLT
3519 relocation. */
3520 if (!add_dynamic_entry (DT_PLTGOT, 0))
3521 return FALSE;
3522
3523 if (htab->elf.srelplt->size != 0)
3524 {
3525 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3526 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3527 || !add_dynamic_entry (DT_JMPREL, 0))
3528 return FALSE;
3529 }
3530 }
3531
3532 if (relocs)
3533 {
3534 if (!add_dynamic_entry (DT_REL, 0)
3535 || !add_dynamic_entry (DT_RELSZ, 0)
3536 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3537 return FALSE;
3538
3539 /* If any dynamic relocs apply to a read-only section,
3540 then we need a DT_TEXTREL entry. */
3541 if ((info->flags & DF_TEXTREL) == 0)
3542 elf_link_hash_traverse (&htab->elf,
3543 elf_i386_readonly_dynrelocs, info);
3544
3545 if ((info->flags & DF_TEXTREL) != 0)
3546 {
3547 if ((elf_tdata (output_bfd)->has_gnu_symbols
3548 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3549 {
3550 info->callbacks->einfo
3551 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3552 bfd_set_error (bfd_error_bad_value);
3553 return FALSE;
3554 }
3555
3556 if (!add_dynamic_entry (DT_TEXTREL, 0))
3557 return FALSE;
3558 }
3559 }
3560 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3561 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3562 return FALSE;
3563 }
3564 #undef add_dynamic_entry
3565
3566 return TRUE;
3567 }
3568
3569 static bfd_boolean
3570 elf_i386_always_size_sections (bfd *output_bfd,
3571 struct bfd_link_info *info)
3572 {
3573 asection *tls_sec = elf_hash_table (info)->tls_sec;
3574
3575 if (tls_sec)
3576 {
3577 struct elf_link_hash_entry *tlsbase;
3578
3579 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3580 "_TLS_MODULE_BASE_",
3581 FALSE, FALSE, FALSE);
3582
3583 if (tlsbase && tlsbase->type == STT_TLS)
3584 {
3585 struct elf_i386_link_hash_table *htab;
3586 struct bfd_link_hash_entry *bh = NULL;
3587 const struct elf_backend_data *bed
3588 = get_elf_backend_data (output_bfd);
3589
3590 htab = elf_i386_hash_table (info);
3591 if (htab == NULL)
3592 return FALSE;
3593
3594 if (!(_bfd_generic_link_add_one_symbol
3595 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3596 tls_sec, 0, NULL, FALSE,
3597 bed->collect, &bh)))
3598 return FALSE;
3599
3600 htab->tls_module_base = bh;
3601
3602 tlsbase = (struct elf_link_hash_entry *)bh;
3603 tlsbase->def_regular = 1;
3604 tlsbase->other = STV_HIDDEN;
3605 tlsbase->root.linker_def = 1;
3606 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3607 }
3608 }
3609
3610 return TRUE;
3611 }
3612
3613 /* Set the correct type for an x86 ELF section. We do this by the
3614 section name, which is a hack, but ought to work. */
3615
3616 static bfd_boolean
3617 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3618 Elf_Internal_Shdr *hdr,
3619 asection *sec)
3620 {
3621 const char *name;
3622
3623 name = bfd_get_section_name (abfd, sec);
3624
3625 /* This is an ugly, but unfortunately necessary hack that is
3626 needed when producing EFI binaries on x86. It tells
3627 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3628 containing ELF relocation info. We need this hack in order to
3629 be able to generate ELF binaries that can be translated into
3630 EFI applications (which are essentially COFF objects). Those
3631 files contain a COFF ".reloc" section inside an ELFNN object,
3632 which would normally cause BFD to segfault because it would
3633 attempt to interpret this section as containing relocation
3634 entries for section "oc". With this hack enabled, ".reloc"
3635 will be treated as a normal data section, which will avoid the
3636 segfault. However, you won't be able to create an ELFNN binary
3637 with a section named "oc" that needs relocations, but that's
3638 the kind of ugly side-effects you get when detecting section
3639 types based on their names... In practice, this limitation is
3640 unlikely to bite. */
3641 if (strcmp (name, ".reloc") == 0)
3642 hdr->sh_type = SHT_PROGBITS;
3643
3644 return TRUE;
3645 }
3646
3647 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3648 executables. Rather than setting it to the beginning of the TLS
3649 section, we have to set it to the end. This function may be called
3650 multiple times, it is idempotent. */
3651
3652 static void
3653 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3654 {
3655 struct elf_i386_link_hash_table *htab;
3656 struct bfd_link_hash_entry *base;
3657
3658 if (!bfd_link_executable (info))
3659 return;
3660
3661 htab = elf_i386_hash_table (info);
3662 if (htab == NULL)
3663 return;
3664
3665 base = htab->tls_module_base;
3666 if (base == NULL)
3667 return;
3668
3669 base->u.def.value = htab->elf.tls_size;
3670 }
3671
3672 /* Return the base VMA address which should be subtracted from real addresses
3673 when resolving @dtpoff relocation.
3674 This is PT_TLS segment p_vaddr. */
3675
3676 static bfd_vma
3677 elf_i386_dtpoff_base (struct bfd_link_info *info)
3678 {
3679 /* If tls_sec is NULL, we should have signalled an error already. */
3680 if (elf_hash_table (info)->tls_sec == NULL)
3681 return 0;
3682 return elf_hash_table (info)->tls_sec->vma;
3683 }
3684
3685 /* Return the relocation value for @tpoff relocation
3686 if STT_TLS virtual address is ADDRESS. */
3687
3688 static bfd_vma
3689 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3690 {
3691 struct elf_link_hash_table *htab = elf_hash_table (info);
3692 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3693 bfd_vma static_tls_size;
3694
3695 /* If tls_sec is NULL, we should have signalled an error already. */
3696 if (htab->tls_sec == NULL)
3697 return 0;
3698
3699 /* Consider special static TLS alignment requirements. */
3700 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3701 return static_tls_size + htab->tls_sec->vma - address;
3702 }
3703
3704 /* Relocate an i386 ELF section. */
3705
3706 static bfd_boolean
3707 elf_i386_relocate_section (bfd *output_bfd,
3708 struct bfd_link_info *info,
3709 bfd *input_bfd,
3710 asection *input_section,
3711 bfd_byte *contents,
3712 Elf_Internal_Rela *relocs,
3713 Elf_Internal_Sym *local_syms,
3714 asection **local_sections)
3715 {
3716 struct elf_i386_link_hash_table *htab;
3717 Elf_Internal_Shdr *symtab_hdr;
3718 struct elf_link_hash_entry **sym_hashes;
3719 bfd_vma *local_got_offsets;
3720 bfd_vma *local_tlsdesc_gotents;
3721 Elf_Internal_Rela *rel;
3722 Elf_Internal_Rela *wrel;
3723 Elf_Internal_Rela *relend;
3724 bfd_boolean is_vxworks_tls;
3725 unsigned plt_entry_size;
3726
3727 BFD_ASSERT (is_i386_elf (input_bfd));
3728
3729 htab = elf_i386_hash_table (info);
3730 if (htab == NULL)
3731 return FALSE;
3732 symtab_hdr = &elf_symtab_hdr (input_bfd);
3733 sym_hashes = elf_sym_hashes (input_bfd);
3734 local_got_offsets = elf_local_got_offsets (input_bfd);
3735 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3736 /* We have to handle relocations in vxworks .tls_vars sections
3737 specially, because the dynamic loader is 'weird'. */
3738 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3739 && bfd_link_pic (info)
3740 && !strcmp (input_section->output_section->name,
3741 ".tls_vars"));
3742
3743 elf_i386_set_tls_module_base (info);
3744
3745 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3746
3747 rel = wrel = relocs;
3748 relend = relocs + input_section->reloc_count;
3749 for (; rel < relend; wrel++, rel++)
3750 {
3751 unsigned int r_type;
3752 reloc_howto_type *howto;
3753 unsigned long r_symndx;
3754 struct elf_link_hash_entry *h;
3755 struct elf_i386_link_hash_entry *eh;
3756 Elf_Internal_Sym *sym;
3757 asection *sec;
3758 bfd_vma off, offplt, plt_offset;
3759 bfd_vma relocation;
3760 bfd_boolean unresolved_reloc;
3761 bfd_reloc_status_type r;
3762 unsigned int indx;
3763 int tls_type;
3764 bfd_vma st_size;
3765 asection *resolved_plt;
3766 bfd_boolean resolved_to_zero;
3767
3768 r_type = ELF32_R_TYPE (rel->r_info);
3769 if (r_type == R_386_GNU_VTINHERIT
3770 || r_type == R_386_GNU_VTENTRY)
3771 {
3772 if (wrel != rel)
3773 *wrel = *rel;
3774 continue;
3775 }
3776
3777 if ((indx = r_type) >= R_386_standard
3778 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3779 >= R_386_ext - R_386_standard)
3780 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3781 >= R_386_ext2 - R_386_ext))
3782 {
3783 (*_bfd_error_handler)
3784 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3785 input_bfd, input_section, r_type);
3786 bfd_set_error (bfd_error_bad_value);
3787 return FALSE;
3788 }
3789 howto = elf_howto_table + indx;
3790
3791 r_symndx = ELF32_R_SYM (rel->r_info);
3792 h = NULL;
3793 sym = NULL;
3794 sec = NULL;
3795 unresolved_reloc = FALSE;
3796 if (r_symndx < symtab_hdr->sh_info)
3797 {
3798 sym = local_syms + r_symndx;
3799 sec = local_sections[r_symndx];
3800 relocation = (sec->output_section->vma
3801 + sec->output_offset
3802 + sym->st_value);
3803 st_size = sym->st_size;
3804
3805 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3806 && ((sec->flags & SEC_MERGE) != 0
3807 || (bfd_link_relocatable (info)
3808 && sec->output_offset != 0)))
3809 {
3810 bfd_vma addend;
3811 bfd_byte *where = contents + rel->r_offset;
3812
3813 switch (howto->size)
3814 {
3815 case 0:
3816 addend = bfd_get_8 (input_bfd, where);
3817 if (howto->pc_relative)
3818 {
3819 addend = (addend ^ 0x80) - 0x80;
3820 addend += 1;
3821 }
3822 break;
3823 case 1:
3824 addend = bfd_get_16 (input_bfd, where);
3825 if (howto->pc_relative)
3826 {
3827 addend = (addend ^ 0x8000) - 0x8000;
3828 addend += 2;
3829 }
3830 break;
3831 case 2:
3832 addend = bfd_get_32 (input_bfd, where);
3833 if (howto->pc_relative)
3834 {
3835 addend = (addend ^ 0x80000000) - 0x80000000;
3836 addend += 4;
3837 }
3838 break;
3839 default:
3840 abort ();
3841 }
3842
3843 if (bfd_link_relocatable (info))
3844 addend += sec->output_offset;
3845 else
3846 {
3847 asection *msec = sec;
3848 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3849 addend);
3850 addend -= relocation;
3851 addend += msec->output_section->vma + msec->output_offset;
3852 }
3853
3854 switch (howto->size)
3855 {
3856 case 0:
3857 /* FIXME: overflow checks. */
3858 if (howto->pc_relative)
3859 addend -= 1;
3860 bfd_put_8 (input_bfd, addend, where);
3861 break;
3862 case 1:
3863 if (howto->pc_relative)
3864 addend -= 2;
3865 bfd_put_16 (input_bfd, addend, where);
3866 break;
3867 case 2:
3868 if (howto->pc_relative)
3869 addend -= 4;
3870 bfd_put_32 (input_bfd, addend, where);
3871 break;
3872 }
3873 }
3874 else if (!bfd_link_relocatable (info)
3875 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3876 {
3877 /* Relocate against local STT_GNU_IFUNC symbol. */
3878 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3879 FALSE);
3880 if (h == NULL)
3881 abort ();
3882
3883 /* Set STT_GNU_IFUNC symbol value. */
3884 h->root.u.def.value = sym->st_value;
3885 h->root.u.def.section = sec;
3886 }
3887 }
3888 else
3889 {
3890 bfd_boolean warned ATTRIBUTE_UNUSED;
3891 bfd_boolean ignored ATTRIBUTE_UNUSED;
3892
3893 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3894 r_symndx, symtab_hdr, sym_hashes,
3895 h, sec, relocation,
3896 unresolved_reloc, warned, ignored);
3897 st_size = h->size;
3898 }
3899
3900 if (sec != NULL && discarded_section (sec))
3901 {
3902 _bfd_clear_contents (howto, input_bfd, input_section,
3903 contents + rel->r_offset);
3904 wrel->r_offset = rel->r_offset;
3905 wrel->r_info = 0;
3906 wrel->r_addend = 0;
3907
3908 /* For ld -r, remove relocations in debug sections against
3909 sections defined in discarded sections. Not done for
3910 eh_frame editing code expects to be present. */
3911 if (bfd_link_relocatable (info)
3912 && (input_section->flags & SEC_DEBUGGING))
3913 wrel--;
3914
3915 continue;
3916 }
3917
3918 if (bfd_link_relocatable (info))
3919 {
3920 if (wrel != rel)
3921 *wrel = *rel;
3922 continue;
3923 }
3924
3925 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3926 it here if it is defined in a non-shared object. */
3927 if (h != NULL
3928 && h->type == STT_GNU_IFUNC
3929 && h->def_regular)
3930 {
3931 asection *plt, *gotplt, *base_got;
3932 bfd_vma plt_index;
3933 const char *name;
3934
3935 if ((input_section->flags & SEC_ALLOC) == 0)
3936 {
3937 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3938 sections because such sections are not SEC_ALLOC and
3939 thus ld.so will not process them. */
3940 if ((input_section->flags & SEC_DEBUGGING) != 0)
3941 continue;
3942 abort ();
3943 }
3944 else if (h->plt.offset == (bfd_vma) -1)
3945 abort ();
3946
3947 /* STT_GNU_IFUNC symbol must go through PLT. */
3948 if (htab->elf.splt != NULL)
3949 {
3950 plt = htab->elf.splt;
3951 gotplt = htab->elf.sgotplt;
3952 }
3953 else
3954 {
3955 plt = htab->elf.iplt;
3956 gotplt = htab->elf.igotplt;
3957 }
3958
3959 relocation = (plt->output_section->vma
3960 + plt->output_offset + h->plt.offset);
3961
3962 switch (r_type)
3963 {
3964 default:
3965 if (h->root.root.string)
3966 name = h->root.root.string;
3967 else
3968 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3969 NULL);
3970 (*_bfd_error_handler)
3971 (_("%B: relocation %s against STT_GNU_IFUNC "
3972 "symbol `%s' isn't handled by %s"), input_bfd,
3973 elf_howto_table[r_type].name,
3974 name, __FUNCTION__);
3975 bfd_set_error (bfd_error_bad_value);
3976 return FALSE;
3977
3978 case R_386_32:
3979 /* Generate dynamic relcoation only when there is a
3980 non-GOT reference in a shared object. */
3981 if (bfd_link_pic (info) && h->non_got_ref)
3982 {
3983 Elf_Internal_Rela outrel;
3984 asection *sreloc;
3985 bfd_vma offset;
3986
3987 /* Need a dynamic relocation to get the real function
3988 adddress. */
3989 offset = _bfd_elf_section_offset (output_bfd,
3990 info,
3991 input_section,
3992 rel->r_offset);
3993 if (offset == (bfd_vma) -1
3994 || offset == (bfd_vma) -2)
3995 abort ();
3996
3997 outrel.r_offset = (input_section->output_section->vma
3998 + input_section->output_offset
3999 + offset);
4000
4001 if (h->dynindx == -1
4002 || h->forced_local
4003 || bfd_link_executable (info))
4004 {
4005 /* This symbol is resolved locally. */
4006 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4007 bfd_put_32 (output_bfd,
4008 (h->root.u.def.value
4009 + h->root.u.def.section->output_section->vma
4010 + h->root.u.def.section->output_offset),
4011 contents + offset);
4012 }
4013 else
4014 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4015
4016 sreloc = htab->elf.irelifunc;
4017 elf_append_rel (output_bfd, sreloc, &outrel);
4018
4019 /* If this reloc is against an external symbol, we
4020 do not want to fiddle with the addend. Otherwise,
4021 we need to include the symbol value so that it
4022 becomes an addend for the dynamic reloc. For an
4023 internal symbol, we have updated addend. */
4024 continue;
4025 }
4026 /* FALLTHROUGH */
4027 case R_386_PC32:
4028 case R_386_PLT32:
4029 goto do_relocation;
4030
4031 case R_386_GOT32:
4032 case R_386_GOT32X:
4033 base_got = htab->elf.sgot;
4034 off = h->got.offset;
4035
4036 if (base_got == NULL)
4037 abort ();
4038
4039 if (off == (bfd_vma) -1)
4040 {
4041 /* We can't use h->got.offset here to save state, or
4042 even just remember the offset, as finish_dynamic_symbol
4043 would use that as offset into .got. */
4044
4045 if (htab->elf.splt != NULL)
4046 {
4047 plt_index = h->plt.offset / plt_entry_size - 1;
4048 off = (plt_index + 3) * 4;
4049 base_got = htab->elf.sgotplt;
4050 }
4051 else
4052 {
4053 plt_index = h->plt.offset / plt_entry_size;
4054 off = plt_index * 4;
4055 base_got = htab->elf.igotplt;
4056 }
4057
4058 if (h->dynindx == -1
4059 || h->forced_local
4060 || info->symbolic)
4061 {
4062 /* This references the local defitionion. We must
4063 initialize this entry in the global offset table.
4064 Since the offset must always be a multiple of 8,
4065 we use the least significant bit to record
4066 whether we have initialized it already.
4067
4068 When doing a dynamic link, we create a .rela.got
4069 relocation entry to initialize the value. This
4070 is done in the finish_dynamic_symbol routine. */
4071 if ((off & 1) != 0)
4072 off &= ~1;
4073 else
4074 {
4075 bfd_put_32 (output_bfd, relocation,
4076 base_got->contents + off);
4077 h->got.offset |= 1;
4078 }
4079 }
4080
4081 relocation = off;
4082
4083 /* Adjust for static executables. */
4084 if (htab->elf.splt == NULL)
4085 relocation += gotplt->output_offset;
4086 }
4087 else
4088 {
4089 relocation = (base_got->output_section->vma
4090 + base_got->output_offset + off
4091 - gotplt->output_section->vma
4092 - gotplt->output_offset);
4093 /* Adjust for static executables. */
4094 if (htab->elf.splt == NULL)
4095 relocation += gotplt->output_offset;
4096 }
4097
4098 goto do_relocation;
4099
4100 case R_386_GOTOFF:
4101 relocation -= (gotplt->output_section->vma
4102 + gotplt->output_offset);
4103 goto do_relocation;
4104 }
4105 }
4106
4107 eh = (struct elf_i386_link_hash_entry *) h;
4108 resolved_to_zero = (eh != NULL
4109 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
4110
4111 switch (r_type)
4112 {
4113 case R_386_GOT32X:
4114 /* Avoid optimizing _DYNAMIC since ld.so may use its
4115 link-time address. */
4116 if (h == htab->elf.hdynamic)
4117 goto r_386_got32;
4118
4119 if (bfd_link_pic (info))
4120 {
4121 /* It is OK to convert mov to lea and convert indirect
4122 branch to direct branch. It is OK to convert adc,
4123 add, and, cmp, or, sbb, sub, test, xor only when PIC
4124 is false. */
4125 unsigned int opcode, addend;
4126 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4127 if (addend != 0)
4128 goto r_386_got32;
4129 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4130 if (opcode != 0x8b && opcode != 0xff)
4131 goto r_386_got32;
4132 }
4133
4134 /* Resolve "mov GOT[(%reg)], %reg",
4135 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4136 and "binop foo@GOT[(%reg)], %reg". */
4137 if (h == NULL
4138 || (h->plt.offset == (bfd_vma) -1
4139 && h->got.offset == (bfd_vma) -1)
4140 || htab->elf.sgotplt == NULL)
4141 abort ();
4142
4143 offplt = (htab->elf.sgotplt->output_section->vma
4144 + htab->elf.sgotplt->output_offset);
4145
4146 /* It is relative to .got.plt section. */
4147 if (h->got.offset != (bfd_vma) -1)
4148 /* Use GOT entry. Mask off the least significant bit in
4149 GOT offset which may be set by R_386_GOT32 processing
4150 below. */
4151 relocation = (htab->elf.sgot->output_section->vma
4152 + htab->elf.sgot->output_offset
4153 + (h->got.offset & ~1) - offplt);
4154 else
4155 /* Use GOTPLT entry. */
4156 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4157
4158 if (!bfd_link_pic (info))
4159 {
4160 /* If not PIC, add the .got.plt section address for
4161 baseless addressing. */
4162 unsigned int modrm;
4163 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4164 if ((modrm & 0xc7) == 0x5)
4165 relocation += offplt;
4166 }
4167
4168 unresolved_reloc = FALSE;
4169 break;
4170
4171 case R_386_GOT32:
4172 r_386_got32:
4173 /* Relocation is to the entry for this symbol in the global
4174 offset table. */
4175 if (htab->elf.sgot == NULL)
4176 abort ();
4177
4178 if (h != NULL)
4179 {
4180 bfd_boolean dyn;
4181
4182 off = h->got.offset;
4183 dyn = htab->elf.dynamic_sections_created;
4184 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4185 bfd_link_pic (info),
4186 h)
4187 || (bfd_link_pic (info)
4188 && SYMBOL_REFERENCES_LOCAL (info, h))
4189 || (ELF_ST_VISIBILITY (h->other)
4190 && h->root.type == bfd_link_hash_undefweak))
4191 {
4192 /* This is actually a static link, or it is a
4193 -Bsymbolic link and the symbol is defined
4194 locally, or the symbol was forced to be local
4195 because of a version file. We must initialize
4196 this entry in the global offset table. Since the
4197 offset must always be a multiple of 4, we use the
4198 least significant bit to record whether we have
4199 initialized it already.
4200
4201 When doing a dynamic link, we create a .rel.got
4202 relocation entry to initialize the value. This
4203 is done in the finish_dynamic_symbol routine. */
4204 if ((off & 1) != 0)
4205 off &= ~1;
4206 else
4207 {
4208 bfd_put_32 (output_bfd, relocation,
4209 htab->elf.sgot->contents + off);
4210 h->got.offset |= 1;
4211 }
4212 }
4213 else
4214 unresolved_reloc = FALSE;
4215 }
4216 else
4217 {
4218 if (local_got_offsets == NULL)
4219 abort ();
4220
4221 off = local_got_offsets[r_symndx];
4222
4223 /* The offset must always be a multiple of 4. We use
4224 the least significant bit to record whether we have
4225 already generated the necessary reloc. */
4226 if ((off & 1) != 0)
4227 off &= ~1;
4228 else
4229 {
4230 bfd_put_32 (output_bfd, relocation,
4231 htab->elf.sgot->contents + off);
4232
4233 if (bfd_link_pic (info))
4234 {
4235 asection *s;
4236 Elf_Internal_Rela outrel;
4237
4238 s = htab->elf.srelgot;
4239 if (s == NULL)
4240 abort ();
4241
4242 outrel.r_offset = (htab->elf.sgot->output_section->vma
4243 + htab->elf.sgot->output_offset
4244 + off);
4245 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4246 elf_append_rel (output_bfd, s, &outrel);
4247 }
4248
4249 local_got_offsets[r_symndx] |= 1;
4250 }
4251 }
4252
4253 if (off >= (bfd_vma) -2)
4254 abort ();
4255
4256 relocation = htab->elf.sgot->output_section->vma
4257 + htab->elf.sgot->output_offset + off
4258 - htab->elf.sgotplt->output_section->vma
4259 - htab->elf.sgotplt->output_offset;
4260 break;
4261
4262 case R_386_GOTOFF:
4263 /* Relocation is relative to the start of the global offset
4264 table. */
4265
4266 /* Check to make sure it isn't a protected function or data
4267 symbol for shared library since it may not be local when
4268 used as function address or with copy relocation. We also
4269 need to make sure that a symbol is referenced locally. */
4270 if (!bfd_link_executable (info) && h)
4271 {
4272 if (!h->def_regular)
4273 {
4274 const char *v;
4275
4276 switch (ELF_ST_VISIBILITY (h->other))
4277 {
4278 case STV_HIDDEN:
4279 v = _("hidden symbol");
4280 break;
4281 case STV_INTERNAL:
4282 v = _("internal symbol");
4283 break;
4284 case STV_PROTECTED:
4285 v = _("protected symbol");
4286 break;
4287 default:
4288 v = _("symbol");
4289 break;
4290 }
4291
4292 (*_bfd_error_handler)
4293 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4294 input_bfd, v, h->root.root.string);
4295 bfd_set_error (bfd_error_bad_value);
4296 return FALSE;
4297 }
4298 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4299 && (h->type == STT_FUNC
4300 || h->type == STT_OBJECT)
4301 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4302 {
4303 (*_bfd_error_handler)
4304 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4305 input_bfd,
4306 h->type == STT_FUNC ? "function" : "data",
4307 h->root.root.string);
4308 bfd_set_error (bfd_error_bad_value);
4309 return FALSE;
4310 }
4311 }
4312
4313 /* Note that sgot is not involved in this
4314 calculation. We always want the start of .got.plt. If we
4315 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4316 permitted by the ABI, we might have to change this
4317 calculation. */
4318 relocation -= htab->elf.sgotplt->output_section->vma
4319 + htab->elf.sgotplt->output_offset;
4320 break;
4321
4322 case R_386_GOTPC:
4323 /* Use global offset table as symbol value. */
4324 relocation = htab->elf.sgotplt->output_section->vma
4325 + htab->elf.sgotplt->output_offset;
4326 unresolved_reloc = FALSE;
4327 break;
4328
4329 case R_386_PLT32:
4330 /* Relocation is to the entry for this symbol in the
4331 procedure linkage table. */
4332
4333 /* Resolve a PLT32 reloc against a local symbol directly,
4334 without using the procedure linkage table. */
4335 if (h == NULL)
4336 break;
4337
4338 if ((h->plt.offset == (bfd_vma) -1
4339 && eh->plt_got.offset == (bfd_vma) -1)
4340 || htab->elf.splt == NULL)
4341 {
4342 /* We didn't make a PLT entry for this symbol. This
4343 happens when statically linking PIC code, or when
4344 using -Bsymbolic. */
4345 break;
4346 }
4347
4348 if (h->plt.offset != (bfd_vma) -1)
4349 {
4350 resolved_plt = htab->elf.splt;
4351 plt_offset = h->plt.offset;
4352 }
4353 else
4354 {
4355 resolved_plt = htab->plt_got;
4356 plt_offset = eh->plt_got.offset;
4357 }
4358
4359 relocation = (resolved_plt->output_section->vma
4360 + resolved_plt->output_offset
4361 + plt_offset);
4362 unresolved_reloc = FALSE;
4363 break;
4364
4365 case R_386_SIZE32:
4366 /* Set to symbol size. */
4367 relocation = st_size;
4368 /* Fall through. */
4369
4370 case R_386_32:
4371 case R_386_PC32:
4372 if ((input_section->flags & SEC_ALLOC) == 0
4373 || is_vxworks_tls)
4374 break;
4375
4376 /* Copy dynamic function pointer relocations. Don't generate
4377 dynamic relocations against resolved undefined weak symbols
4378 in PIE, except for R_386_PC32. */
4379 if ((bfd_link_pic (info)
4380 && (h == NULL
4381 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4382 && (!resolved_to_zero
4383 || r_type == R_386_PC32))
4384 || h->root.type != bfd_link_hash_undefweak))
4385 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4386 || !SYMBOL_CALLS_LOCAL (info, h)))
4387 || (ELIMINATE_COPY_RELOCS
4388 && !bfd_link_pic (info)
4389 && h != NULL
4390 && h->dynindx != -1
4391 && (!h->non_got_ref
4392 || eh->func_pointer_refcount > 0
4393 || (h->root.type == bfd_link_hash_undefweak
4394 && !resolved_to_zero))
4395 && ((h->def_dynamic && !h->def_regular)
4396 /* Undefined weak symbol is bound locally when
4397 PIC is false. */
4398 || h->root.type == bfd_link_hash_undefweak)))
4399 {
4400 Elf_Internal_Rela outrel;
4401 bfd_boolean skip, relocate;
4402 asection *sreloc;
4403
4404 /* When generating a shared object, these relocations
4405 are copied into the output file to be resolved at run
4406 time. */
4407
4408 skip = FALSE;
4409 relocate = FALSE;
4410
4411 outrel.r_offset =
4412 _bfd_elf_section_offset (output_bfd, info, input_section,
4413 rel->r_offset);
4414 if (outrel.r_offset == (bfd_vma) -1)
4415 skip = TRUE;
4416 else if (outrel.r_offset == (bfd_vma) -2)
4417 skip = TRUE, relocate = TRUE;
4418 outrel.r_offset += (input_section->output_section->vma
4419 + input_section->output_offset);
4420
4421 if (skip)
4422 memset (&outrel, 0, sizeof outrel);
4423 else if (h != NULL
4424 && h->dynindx != -1
4425 && (r_type == R_386_PC32
4426 || !bfd_link_pic (info)
4427 || !SYMBOLIC_BIND (info, h)
4428 || !h->def_regular))
4429 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4430 else
4431 {
4432 /* This symbol is local, or marked to become local. */
4433 relocate = TRUE;
4434 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4435 }
4436
4437 sreloc = elf_section_data (input_section)->sreloc;
4438
4439 if (sreloc == NULL || sreloc->contents == NULL)
4440 {
4441 r = bfd_reloc_notsupported;
4442 goto check_relocation_error;
4443 }
4444
4445 elf_append_rel (output_bfd, sreloc, &outrel);
4446
4447 /* If this reloc is against an external symbol, we do
4448 not want to fiddle with the addend. Otherwise, we
4449 need to include the symbol value so that it becomes
4450 an addend for the dynamic reloc. */
4451 if (! relocate)
4452 continue;
4453 }
4454 break;
4455
4456 case R_386_TLS_IE:
4457 if (!bfd_link_executable (info))
4458 {
4459 Elf_Internal_Rela outrel;
4460 asection *sreloc;
4461
4462 outrel.r_offset = rel->r_offset
4463 + input_section->output_section->vma
4464 + input_section->output_offset;
4465 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4466 sreloc = elf_section_data (input_section)->sreloc;
4467 if (sreloc == NULL)
4468 abort ();
4469 elf_append_rel (output_bfd, sreloc, &outrel);
4470 }
4471 /* Fall through */
4472
4473 case R_386_TLS_GD:
4474 case R_386_TLS_GOTDESC:
4475 case R_386_TLS_DESC_CALL:
4476 case R_386_TLS_IE_32:
4477 case R_386_TLS_GOTIE:
4478 tls_type = GOT_UNKNOWN;
4479 if (h == NULL && local_got_offsets)
4480 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4481 else if (h != NULL)
4482 tls_type = elf_i386_hash_entry(h)->tls_type;
4483 if (tls_type == GOT_TLS_IE)
4484 tls_type = GOT_TLS_IE_NEG;
4485
4486 if (! elf_i386_tls_transition (info, input_bfd,
4487 input_section, contents,
4488 symtab_hdr, sym_hashes,
4489 &r_type, tls_type, rel,
4490 relend, h, r_symndx))
4491 return FALSE;
4492
4493 if (r_type == R_386_TLS_LE_32)
4494 {
4495 BFD_ASSERT (! unresolved_reloc);
4496 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4497 {
4498 unsigned int type;
4499 bfd_vma roff;
4500
4501 /* GD->LE transition. */
4502 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4503 if (type == 0x04)
4504 {
4505 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4506 Change it into:
4507 movl %gs:0, %eax; subl $foo@tpoff, %eax
4508 (6 byte form of subl). */
4509 memcpy (contents + rel->r_offset - 3,
4510 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4511 roff = rel->r_offset + 5;
4512 }
4513 else
4514 {
4515 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4516 Change it into:
4517 movl %gs:0, %eax; subl $foo@tpoff, %eax
4518 (6 byte form of subl). */
4519 memcpy (contents + rel->r_offset - 2,
4520 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4521 roff = rel->r_offset + 6;
4522 }
4523 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4524 contents + roff);
4525 /* Skip R_386_PC32/R_386_PLT32. */
4526 rel++;
4527 wrel++;
4528 continue;
4529 }
4530 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4531 {
4532 /* GDesc -> LE transition.
4533 It's originally something like:
4534 leal x@tlsdesc(%ebx), %eax
4535
4536 leal x@ntpoff, %eax
4537
4538 Registers other than %eax may be set up here. */
4539
4540 unsigned int val;
4541 bfd_vma roff;
4542
4543 roff = rel->r_offset;
4544 val = bfd_get_8 (input_bfd, contents + roff - 1);
4545
4546 /* Now modify the instruction as appropriate. */
4547 /* aoliva FIXME: remove the above and xor the byte
4548 below with 0x86. */
4549 bfd_put_8 (output_bfd, val ^ 0x86,
4550 contents + roff - 1);
4551 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4552 contents + roff);
4553 continue;
4554 }
4555 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4556 {
4557 /* GDesc -> LE transition.
4558 It's originally:
4559 call *(%eax)
4560 Turn it into:
4561 xchg %ax,%ax */
4562
4563 bfd_vma roff;
4564
4565 roff = rel->r_offset;
4566 bfd_put_8 (output_bfd, 0x66, contents + roff);
4567 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4568 continue;
4569 }
4570 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4571 {
4572 unsigned int val;
4573
4574 /* IE->LE transition:
4575 Originally it can be one of:
4576 movl foo, %eax
4577 movl foo, %reg
4578 addl foo, %reg
4579 We change it into:
4580 movl $foo, %eax
4581 movl $foo, %reg
4582 addl $foo, %reg. */
4583 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4584 if (val == 0xa1)
4585 {
4586 /* movl foo, %eax. */
4587 bfd_put_8 (output_bfd, 0xb8,
4588 contents + rel->r_offset - 1);
4589 }
4590 else
4591 {
4592 unsigned int type;
4593
4594 type = bfd_get_8 (input_bfd,
4595 contents + rel->r_offset - 2);
4596 switch (type)
4597 {
4598 case 0x8b:
4599 /* movl */
4600 bfd_put_8 (output_bfd, 0xc7,
4601 contents + rel->r_offset - 2);
4602 bfd_put_8 (output_bfd,
4603 0xc0 | ((val >> 3) & 7),
4604 contents + rel->r_offset - 1);
4605 break;
4606 case 0x03:
4607 /* addl */
4608 bfd_put_8 (output_bfd, 0x81,
4609 contents + rel->r_offset - 2);
4610 bfd_put_8 (output_bfd,
4611 0xc0 | ((val >> 3) & 7),
4612 contents + rel->r_offset - 1);
4613 break;
4614 default:
4615 BFD_FAIL ();
4616 break;
4617 }
4618 }
4619 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4620 contents + rel->r_offset);
4621 continue;
4622 }
4623 else
4624 {
4625 unsigned int val, type;
4626
4627 /* {IE_32,GOTIE}->LE transition:
4628 Originally it can be one of:
4629 subl foo(%reg1), %reg2
4630 movl foo(%reg1), %reg2
4631 addl foo(%reg1), %reg2
4632 We change it into:
4633 subl $foo, %reg2
4634 movl $foo, %reg2 (6 byte form)
4635 addl $foo, %reg2. */
4636 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4637 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4638 if (type == 0x8b)
4639 {
4640 /* movl */
4641 bfd_put_8 (output_bfd, 0xc7,
4642 contents + rel->r_offset - 2);
4643 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4644 contents + rel->r_offset - 1);
4645 }
4646 else if (type == 0x2b)
4647 {
4648 /* subl */
4649 bfd_put_8 (output_bfd, 0x81,
4650 contents + rel->r_offset - 2);
4651 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4652 contents + rel->r_offset - 1);
4653 }
4654 else if (type == 0x03)
4655 {
4656 /* addl */
4657 bfd_put_8 (output_bfd, 0x81,
4658 contents + rel->r_offset - 2);
4659 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4660 contents + rel->r_offset - 1);
4661 }
4662 else
4663 BFD_FAIL ();
4664 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4665 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4666 contents + rel->r_offset);
4667 else
4668 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4669 contents + rel->r_offset);
4670 continue;
4671 }
4672 }
4673
4674 if (htab->elf.sgot == NULL)
4675 abort ();
4676
4677 if (h != NULL)
4678 {
4679 off = h->got.offset;
4680 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4681 }
4682 else
4683 {
4684 if (local_got_offsets == NULL)
4685 abort ();
4686
4687 off = local_got_offsets[r_symndx];
4688 offplt = local_tlsdesc_gotents[r_symndx];
4689 }
4690
4691 if ((off & 1) != 0)
4692 off &= ~1;
4693 else
4694 {
4695 Elf_Internal_Rela outrel;
4696 int dr_type;
4697 asection *sreloc;
4698
4699 if (htab->elf.srelgot == NULL)
4700 abort ();
4701
4702 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4703
4704 if (GOT_TLS_GDESC_P (tls_type))
4705 {
4706 bfd_byte *loc;
4707 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4708 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4709 <= htab->elf.sgotplt->size);
4710 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4711 + htab->elf.sgotplt->output_offset
4712 + offplt
4713 + htab->sgotplt_jump_table_size);
4714 sreloc = htab->elf.srelplt;
4715 loc = sreloc->contents;
4716 loc += (htab->next_tls_desc_index++
4717 * sizeof (Elf32_External_Rel));
4718 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4719 <= sreloc->contents + sreloc->size);
4720 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4721 if (indx == 0)
4722 {
4723 BFD_ASSERT (! unresolved_reloc);
4724 bfd_put_32 (output_bfd,
4725 relocation - elf_i386_dtpoff_base (info),
4726 htab->elf.sgotplt->contents + offplt
4727 + htab->sgotplt_jump_table_size + 4);
4728 }
4729 else
4730 {
4731 bfd_put_32 (output_bfd, 0,
4732 htab->elf.sgotplt->contents + offplt
4733 + htab->sgotplt_jump_table_size + 4);
4734 }
4735 }
4736
4737 sreloc = htab->elf.srelgot;
4738
4739 outrel.r_offset = (htab->elf.sgot->output_section->vma
4740 + htab->elf.sgot->output_offset + off);
4741
4742 if (GOT_TLS_GD_P (tls_type))
4743 dr_type = R_386_TLS_DTPMOD32;
4744 else if (GOT_TLS_GDESC_P (tls_type))
4745 goto dr_done;
4746 else if (tls_type == GOT_TLS_IE_POS)
4747 dr_type = R_386_TLS_TPOFF;
4748 else
4749 dr_type = R_386_TLS_TPOFF32;
4750
4751 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4752 bfd_put_32 (output_bfd,
4753 relocation - elf_i386_dtpoff_base (info),
4754 htab->elf.sgot->contents + off);
4755 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4756 bfd_put_32 (output_bfd,
4757 elf_i386_dtpoff_base (info) - relocation,
4758 htab->elf.sgot->contents + off);
4759 else if (dr_type != R_386_TLS_DESC)
4760 bfd_put_32 (output_bfd, 0,
4761 htab->elf.sgot->contents + off);
4762 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4763
4764 elf_append_rel (output_bfd, sreloc, &outrel);
4765
4766 if (GOT_TLS_GD_P (tls_type))
4767 {
4768 if (indx == 0)
4769 {
4770 BFD_ASSERT (! unresolved_reloc);
4771 bfd_put_32 (output_bfd,
4772 relocation - elf_i386_dtpoff_base (info),
4773 htab->elf.sgot->contents + off + 4);
4774 }
4775 else
4776 {
4777 bfd_put_32 (output_bfd, 0,
4778 htab->elf.sgot->contents + off + 4);
4779 outrel.r_info = ELF32_R_INFO (indx,
4780 R_386_TLS_DTPOFF32);
4781 outrel.r_offset += 4;
4782 elf_append_rel (output_bfd, sreloc, &outrel);
4783 }
4784 }
4785 else if (tls_type == GOT_TLS_IE_BOTH)
4786 {
4787 bfd_put_32 (output_bfd,
4788 (indx == 0
4789 ? relocation - elf_i386_dtpoff_base (info)
4790 : 0),
4791 htab->elf.sgot->contents + off + 4);
4792 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4793 outrel.r_offset += 4;
4794 elf_append_rel (output_bfd, sreloc, &outrel);
4795 }
4796
4797 dr_done:
4798 if (h != NULL)
4799 h->got.offset |= 1;
4800 else
4801 local_got_offsets[r_symndx] |= 1;
4802 }
4803
4804 if (off >= (bfd_vma) -2
4805 && ! GOT_TLS_GDESC_P (tls_type))
4806 abort ();
4807 if (r_type == R_386_TLS_GOTDESC
4808 || r_type == R_386_TLS_DESC_CALL)
4809 {
4810 relocation = htab->sgotplt_jump_table_size + offplt;
4811 unresolved_reloc = FALSE;
4812 }
4813 else if (r_type == ELF32_R_TYPE (rel->r_info))
4814 {
4815 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4816 + htab->elf.sgotplt->output_offset;
4817 relocation = htab->elf.sgot->output_section->vma
4818 + htab->elf.sgot->output_offset + off - g_o_t;
4819 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4820 && tls_type == GOT_TLS_IE_BOTH)
4821 relocation += 4;
4822 if (r_type == R_386_TLS_IE)
4823 relocation += g_o_t;
4824 unresolved_reloc = FALSE;
4825 }
4826 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4827 {
4828 unsigned int val, type;
4829 bfd_vma roff;
4830
4831 /* GD->IE transition. */
4832 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4833 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4834 if (type == 0x04)
4835 {
4836 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4837 Change it into:
4838 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4839 val >>= 3;
4840 roff = rel->r_offset - 3;
4841 }
4842 else
4843 {
4844 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4845 Change it into:
4846 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4847 roff = rel->r_offset - 2;
4848 }
4849 memcpy (contents + roff,
4850 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4851 contents[roff + 7] = 0x80 | (val & 7);
4852 /* If foo is used only with foo@gotntpoff(%reg) and
4853 foo@indntpoff, but not with foo@gottpoff(%reg), change
4854 subl $foo@gottpoff(%reg), %eax
4855 into:
4856 addl $foo@gotntpoff(%reg), %eax. */
4857 if (tls_type == GOT_TLS_IE_POS)
4858 contents[roff + 6] = 0x03;
4859 bfd_put_32 (output_bfd,
4860 htab->elf.sgot->output_section->vma
4861 + htab->elf.sgot->output_offset + off
4862 - htab->elf.sgotplt->output_section->vma
4863 - htab->elf.sgotplt->output_offset,
4864 contents + roff + 8);
4865 /* Skip R_386_PLT32. */
4866 rel++;
4867 wrel++;
4868 continue;
4869 }
4870 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4871 {
4872 /* GDesc -> IE transition.
4873 It's originally something like:
4874 leal x@tlsdesc(%ebx), %eax
4875
4876 Change it to:
4877 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4878 or:
4879 movl x@gottpoff(%ebx), %eax # before negl %eax
4880
4881 Registers other than %eax may be set up here. */
4882
4883 bfd_vma roff;
4884
4885 /* First, make sure it's a leal adding ebx to a 32-bit
4886 offset into any register, although it's probably
4887 almost always going to be eax. */
4888 roff = rel->r_offset;
4889
4890 /* Now modify the instruction as appropriate. */
4891 /* To turn a leal into a movl in the form we use it, it
4892 suffices to change the first byte from 0x8d to 0x8b.
4893 aoliva FIXME: should we decide to keep the leal, all
4894 we have to do is remove the statement below, and
4895 adjust the relaxation of R_386_TLS_DESC_CALL. */
4896 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4897
4898 if (tls_type == GOT_TLS_IE_BOTH)
4899 off += 4;
4900
4901 bfd_put_32 (output_bfd,
4902 htab->elf.sgot->output_section->vma
4903 + htab->elf.sgot->output_offset + off
4904 - htab->elf.sgotplt->output_section->vma
4905 - htab->elf.sgotplt->output_offset,
4906 contents + roff);
4907 continue;
4908 }
4909 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4910 {
4911 /* GDesc -> IE transition.
4912 It's originally:
4913 call *(%eax)
4914
4915 Change it to:
4916 xchg %ax,%ax
4917 or
4918 negl %eax
4919 depending on how we transformed the TLS_GOTDESC above.
4920 */
4921
4922 bfd_vma roff;
4923
4924 roff = rel->r_offset;
4925
4926 /* Now modify the instruction as appropriate. */
4927 if (tls_type != GOT_TLS_IE_NEG)
4928 {
4929 /* xchg %ax,%ax */
4930 bfd_put_8 (output_bfd, 0x66, contents + roff);
4931 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4932 }
4933 else
4934 {
4935 /* negl %eax */
4936 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4937 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4938 }
4939
4940 continue;
4941 }
4942 else
4943 BFD_ASSERT (FALSE);
4944 break;
4945
4946 case R_386_TLS_LDM:
4947 if (! elf_i386_tls_transition (info, input_bfd,
4948 input_section, contents,
4949 symtab_hdr, sym_hashes,
4950 &r_type, GOT_UNKNOWN, rel,
4951 relend, h, r_symndx))
4952 return FALSE;
4953
4954 if (r_type != R_386_TLS_LDM)
4955 {
4956 /* LD->LE transition:
4957 leal foo(%reg), %eax; call ___tls_get_addr.
4958 We change it into:
4959 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4960 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4961 memcpy (contents + rel->r_offset - 2,
4962 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4963 /* Skip R_386_PC32/R_386_PLT32. */
4964 rel++;
4965 wrel++;
4966 continue;
4967 }
4968
4969 if (htab->elf.sgot == NULL)
4970 abort ();
4971
4972 off = htab->tls_ldm_got.offset;
4973 if (off & 1)
4974 off &= ~1;
4975 else
4976 {
4977 Elf_Internal_Rela outrel;
4978
4979 if (htab->elf.srelgot == NULL)
4980 abort ();
4981
4982 outrel.r_offset = (htab->elf.sgot->output_section->vma
4983 + htab->elf.sgot->output_offset + off);
4984
4985 bfd_put_32 (output_bfd, 0,
4986 htab->elf.sgot->contents + off);
4987 bfd_put_32 (output_bfd, 0,
4988 htab->elf.sgot->contents + off + 4);
4989 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4990 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4991 htab->tls_ldm_got.offset |= 1;
4992 }
4993 relocation = htab->elf.sgot->output_section->vma
4994 + htab->elf.sgot->output_offset + off
4995 - htab->elf.sgotplt->output_section->vma
4996 - htab->elf.sgotplt->output_offset;
4997 unresolved_reloc = FALSE;
4998 break;
4999
5000 case R_386_TLS_LDO_32:
5001 if (!bfd_link_executable (info)
5002 || (input_section->flags & SEC_CODE) == 0)
5003 relocation -= elf_i386_dtpoff_base (info);
5004 else
5005 /* When converting LDO to LE, we must negate. */
5006 relocation = -elf_i386_tpoff (info, relocation);
5007 break;
5008
5009 case R_386_TLS_LE_32:
5010 case R_386_TLS_LE:
5011 if (!bfd_link_executable (info))
5012 {
5013 Elf_Internal_Rela outrel;
5014 asection *sreloc;
5015
5016 outrel.r_offset = rel->r_offset
5017 + input_section->output_section->vma
5018 + input_section->output_offset;
5019 if (h != NULL && h->dynindx != -1)
5020 indx = h->dynindx;
5021 else
5022 indx = 0;
5023 if (r_type == R_386_TLS_LE_32)
5024 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5025 else
5026 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5027 sreloc = elf_section_data (input_section)->sreloc;
5028 if (sreloc == NULL)
5029 abort ();
5030 elf_append_rel (output_bfd, sreloc, &outrel);
5031 if (indx)
5032 continue;
5033 else if (r_type == R_386_TLS_LE_32)
5034 relocation = elf_i386_dtpoff_base (info) - relocation;
5035 else
5036 relocation -= elf_i386_dtpoff_base (info);
5037 }
5038 else if (r_type == R_386_TLS_LE_32)
5039 relocation = elf_i386_tpoff (info, relocation);
5040 else
5041 relocation = -elf_i386_tpoff (info, relocation);
5042 break;
5043
5044 default:
5045 break;
5046 }
5047
5048 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5049 because such sections are not SEC_ALLOC and thus ld.so will
5050 not process them. */
5051 if (unresolved_reloc
5052 && !((input_section->flags & SEC_DEBUGGING) != 0
5053 && h->def_dynamic)
5054 && _bfd_elf_section_offset (output_bfd, info, input_section,
5055 rel->r_offset) != (bfd_vma) -1)
5056 {
5057 (*_bfd_error_handler)
5058 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5059 input_bfd,
5060 input_section,
5061 (long) rel->r_offset,
5062 howto->name,
5063 h->root.root.string);
5064 return FALSE;
5065 }
5066
5067 do_relocation:
5068 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5069 contents, rel->r_offset,
5070 relocation, 0);
5071
5072 check_relocation_error:
5073 if (r != bfd_reloc_ok)
5074 {
5075 const char *name;
5076
5077 if (h != NULL)
5078 name = h->root.root.string;
5079 else
5080 {
5081 name = bfd_elf_string_from_elf_section (input_bfd,
5082 symtab_hdr->sh_link,
5083 sym->st_name);
5084 if (name == NULL)
5085 return FALSE;
5086 if (*name == '\0')
5087 name = bfd_section_name (input_bfd, sec);
5088 }
5089
5090 if (r == bfd_reloc_overflow)
5091 {
5092 if (! ((*info->callbacks->reloc_overflow)
5093 (info, (h ? &h->root : NULL), name, howto->name,
5094 (bfd_vma) 0, input_bfd, input_section,
5095 rel->r_offset)))
5096 return FALSE;
5097 }
5098 else
5099 {
5100 (*_bfd_error_handler)
5101 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5102 input_bfd, input_section,
5103 (long) rel->r_offset, name, (int) r);
5104 return FALSE;
5105 }
5106 }
5107
5108 if (wrel != rel)
5109 *wrel = *rel;
5110 }
5111
5112 if (wrel != rel)
5113 {
5114 Elf_Internal_Shdr *rel_hdr;
5115 size_t deleted = rel - wrel;
5116
5117 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5118 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5119 if (rel_hdr->sh_size == 0)
5120 {
5121 /* It is too late to remove an empty reloc section. Leave
5122 one NONE reloc.
5123 ??? What is wrong with an empty section??? */
5124 rel_hdr->sh_size = rel_hdr->sh_entsize;
5125 deleted -= 1;
5126 }
5127 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5128 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5129 input_section->reloc_count -= deleted;
5130 }
5131
5132 return TRUE;
5133 }
5134
5135 /* Finish up dynamic symbol handling. We set the contents of various
5136 dynamic sections here. */
5137
5138 static bfd_boolean
5139 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5140 struct bfd_link_info *info,
5141 struct elf_link_hash_entry *h,
5142 Elf_Internal_Sym *sym)
5143 {
5144 struct elf_i386_link_hash_table *htab;
5145 unsigned plt_entry_size;
5146 const struct elf_i386_backend_data *abed;
5147 struct elf_i386_link_hash_entry *eh;
5148 bfd_boolean local_undefweak;
5149
5150 htab = elf_i386_hash_table (info);
5151 if (htab == NULL)
5152 return FALSE;
5153
5154 abed = get_elf_i386_backend_data (output_bfd);
5155 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5156
5157 eh = (struct elf_i386_link_hash_entry *) h;
5158
5159 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5160 resolved undefined weak symbols in executable so that their
5161 references have value 0 at run-time. */
5162 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
5163
5164 if (h->plt.offset != (bfd_vma) -1)
5165 {
5166 bfd_vma plt_index;
5167 bfd_vma got_offset;
5168 Elf_Internal_Rela rel;
5169 bfd_byte *loc;
5170 asection *plt, *gotplt, *relplt;
5171
5172 /* When building a static executable, use .iplt, .igot.plt and
5173 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5174 if (htab->elf.splt != NULL)
5175 {
5176 plt = htab->elf.splt;
5177 gotplt = htab->elf.sgotplt;
5178 relplt = htab->elf.srelplt;
5179 }
5180 else
5181 {
5182 plt = htab->elf.iplt;
5183 gotplt = htab->elf.igotplt;
5184 relplt = htab->elf.irelplt;
5185 }
5186
5187 /* This symbol has an entry in the procedure linkage table. Set
5188 it up. */
5189
5190 if ((h->dynindx == -1
5191 && !local_undefweak
5192 && !((h->forced_local || bfd_link_executable (info))
5193 && h->def_regular
5194 && h->type == STT_GNU_IFUNC))
5195 || plt == NULL
5196 || gotplt == NULL
5197 || relplt == NULL)
5198 abort ();
5199
5200 /* Get the index in the procedure linkage table which
5201 corresponds to this symbol. This is the index of this symbol
5202 in all the symbols for which we are making plt entries. The
5203 first entry in the procedure linkage table is reserved.
5204
5205 Get the offset into the .got table of the entry that
5206 corresponds to this function. Each .got entry is 4 bytes.
5207 The first three are reserved.
5208
5209 For static executables, we don't reserve anything. */
5210
5211 if (plt == htab->elf.splt)
5212 {
5213 got_offset = h->plt.offset / plt_entry_size - 1;
5214 got_offset = (got_offset + 3) * 4;
5215 }
5216 else
5217 {
5218 got_offset = h->plt.offset / plt_entry_size;
5219 got_offset = got_offset * 4;
5220 }
5221
5222 /* Fill in the entry in the procedure linkage table. */
5223 if (! bfd_link_pic (info))
5224 {
5225 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5226 abed->plt->plt_entry_size);
5227 bfd_put_32 (output_bfd,
5228 (gotplt->output_section->vma
5229 + gotplt->output_offset
5230 + got_offset),
5231 plt->contents + h->plt.offset
5232 + abed->plt->plt_got_offset);
5233
5234 if (abed->is_vxworks)
5235 {
5236 int s, k, reloc_index;
5237
5238 /* Create the R_386_32 relocation referencing the GOT
5239 for this PLT entry. */
5240
5241 /* S: Current slot number (zero-based). */
5242 s = ((h->plt.offset - abed->plt->plt_entry_size)
5243 / abed->plt->plt_entry_size);
5244 /* K: Number of relocations for PLTResolve. */
5245 if (bfd_link_pic (info))
5246 k = PLTRESOLVE_RELOCS_SHLIB;
5247 else
5248 k = PLTRESOLVE_RELOCS;
5249 /* Skip the PLTresolve relocations, and the relocations for
5250 the other PLT slots. */
5251 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5252 loc = (htab->srelplt2->contents + reloc_index
5253 * sizeof (Elf32_External_Rel));
5254
5255 rel.r_offset = (htab->elf.splt->output_section->vma
5256 + htab->elf.splt->output_offset
5257 + h->plt.offset + 2),
5258 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5259 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5260
5261 /* Create the R_386_32 relocation referencing the beginning of
5262 the PLT for this GOT entry. */
5263 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5264 + htab->elf.sgotplt->output_offset
5265 + got_offset);
5266 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5267 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5268 loc + sizeof (Elf32_External_Rel));
5269 }
5270 }
5271 else
5272 {
5273 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5274 abed->plt->plt_entry_size);
5275 bfd_put_32 (output_bfd, got_offset,
5276 plt->contents + h->plt.offset
5277 + abed->plt->plt_got_offset);
5278 }
5279
5280 /* Fill in the entry in the global offset table. Leave the entry
5281 as zero for undefined weak symbol in PIE. No PLT relocation
5282 against undefined weak symbol in PIE. */
5283 if (!local_undefweak)
5284 {
5285 bfd_put_32 (output_bfd,
5286 (plt->output_section->vma
5287 + plt->output_offset
5288 + h->plt.offset
5289 + abed->plt->plt_lazy_offset),
5290 gotplt->contents + got_offset);
5291
5292 /* Fill in the entry in the .rel.plt section. */
5293 rel.r_offset = (gotplt->output_section->vma
5294 + gotplt->output_offset
5295 + got_offset);
5296 if (h->dynindx == -1
5297 || ((bfd_link_executable (info)
5298 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5299 && h->def_regular
5300 && h->type == STT_GNU_IFUNC))
5301 {
5302 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5303 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5304 in the .got.plt section. */
5305 bfd_put_32 (output_bfd,
5306 (h->root.u.def.value
5307 + h->root.u.def.section->output_section->vma
5308 + h->root.u.def.section->output_offset),
5309 gotplt->contents + got_offset);
5310 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5311 /* R_386_IRELATIVE comes last. */
5312 plt_index = htab->next_irelative_index--;
5313 }
5314 else
5315 {
5316 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5317 plt_index = htab->next_jump_slot_index++;
5318 }
5319
5320 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5321 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5322
5323 /* Don't fill PLT entry for static executables. */
5324 if (plt == htab->elf.splt)
5325 {
5326 bfd_put_32 (output_bfd,
5327 plt_index * sizeof (Elf32_External_Rel),
5328 plt->contents + h->plt.offset
5329 + abed->plt->plt_reloc_offset);
5330 bfd_put_32 (output_bfd, - (h->plt.offset
5331 + abed->plt->plt_plt_offset + 4),
5332 plt->contents + h->plt.offset
5333 + abed->plt->plt_plt_offset);
5334 }
5335 }
5336 }
5337 else if (eh->plt_got.offset != (bfd_vma) -1)
5338 {
5339 bfd_vma got_offset, plt_offset;
5340 asection *plt, *got, *gotplt;
5341 const bfd_byte *got_plt_entry;
5342
5343 /* Offset of displacement of the indirect jump. */
5344 bfd_vma plt_got_offset = 2;
5345
5346 /* Set the entry in the GOT procedure linkage table. */
5347 plt = htab->plt_got;
5348 got = htab->elf.sgot;
5349 gotplt = htab->elf.sgotplt;
5350 got_offset = h->got.offset;
5351
5352 if (got_offset == (bfd_vma) -1
5353 || plt == NULL
5354 || got == NULL
5355 || gotplt == NULL)
5356 abort ();
5357
5358 /* Fill in the entry in the GOT procedure linkage table. */
5359 if (! bfd_link_pic (info))
5360 {
5361 got_plt_entry = elf_i386_got_plt_entry;
5362 got_offset += got->output_section->vma + got->output_offset;
5363 }
5364 else
5365 {
5366 got_plt_entry = elf_i386_pic_got_plt_entry;
5367 got_offset += (got->output_section->vma
5368 + got->output_offset
5369 - gotplt->output_section->vma
5370 - gotplt->output_offset);
5371 }
5372
5373 plt_offset = eh->plt_got.offset;
5374 memcpy (plt->contents + plt_offset, got_plt_entry,
5375 sizeof (elf_i386_got_plt_entry));
5376 bfd_put_32 (output_bfd, got_offset,
5377 plt->contents + plt_offset + plt_got_offset);
5378 }
5379
5380 if (!local_undefweak
5381 && !h->def_regular
5382 && (h->plt.offset != (bfd_vma) -1
5383 || eh->plt_got.offset != (bfd_vma) -1))
5384 {
5385 /* Mark the symbol as undefined, rather than as defined in
5386 the .plt section. Leave the value if there were any
5387 relocations where pointer equality matters (this is a clue
5388 for the dynamic linker, to make function pointer
5389 comparisons work between an application and shared
5390 library), otherwise set it to zero. If a function is only
5391 called from a binary, there is no need to slow down
5392 shared libraries because of that. */
5393 sym->st_shndx = SHN_UNDEF;
5394 if (!h->pointer_equality_needed)
5395 sym->st_value = 0;
5396 }
5397
5398 /* Don't generate dynamic GOT relocation against undefined weak
5399 symbol in executable. */
5400 if (h->got.offset != (bfd_vma) -1
5401 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5402 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5403 && !local_undefweak)
5404 {
5405 Elf_Internal_Rela rel;
5406
5407 /* This symbol has an entry in the global offset table. Set it
5408 up. */
5409
5410 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5411 abort ();
5412
5413 rel.r_offset = (htab->elf.sgot->output_section->vma
5414 + htab->elf.sgot->output_offset
5415 + (h->got.offset & ~(bfd_vma) 1));
5416
5417 /* If this is a static link, or it is a -Bsymbolic link and the
5418 symbol is defined locally or was forced to be local because
5419 of a version file, we just want to emit a RELATIVE reloc.
5420 The entry in the global offset table will already have been
5421 initialized in the relocate_section function. */
5422 if (h->def_regular
5423 && h->type == STT_GNU_IFUNC)
5424 {
5425 if (bfd_link_pic (info))
5426 {
5427 /* Generate R_386_GLOB_DAT. */
5428 goto do_glob_dat;
5429 }
5430 else
5431 {
5432 asection *plt;
5433
5434 if (!h->pointer_equality_needed)
5435 abort ();
5436
5437 /* For non-shared object, we can't use .got.plt, which
5438 contains the real function addres if we need pointer
5439 equality. We load the GOT entry with the PLT entry. */
5440 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5441 bfd_put_32 (output_bfd,
5442 (plt->output_section->vma
5443 + plt->output_offset + h->plt.offset),
5444 htab->elf.sgot->contents + h->got.offset);
5445 return TRUE;
5446 }
5447 }
5448 else if (bfd_link_pic (info)
5449 && SYMBOL_REFERENCES_LOCAL (info, h))
5450 {
5451 BFD_ASSERT((h->got.offset & 1) != 0);
5452 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5453 }
5454 else
5455 {
5456 BFD_ASSERT((h->got.offset & 1) == 0);
5457 do_glob_dat:
5458 bfd_put_32 (output_bfd, (bfd_vma) 0,
5459 htab->elf.sgot->contents + h->got.offset);
5460 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5461 }
5462
5463 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5464 }
5465
5466 if (h->needs_copy)
5467 {
5468 Elf_Internal_Rela rel;
5469
5470 /* This symbol needs a copy reloc. Set it up. */
5471
5472 if (h->dynindx == -1
5473 || (h->root.type != bfd_link_hash_defined
5474 && h->root.type != bfd_link_hash_defweak)
5475 || htab->srelbss == NULL)
5476 abort ();
5477
5478 rel.r_offset = (h->root.u.def.value
5479 + h->root.u.def.section->output_section->vma
5480 + h->root.u.def.section->output_offset);
5481 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5482 elf_append_rel (output_bfd, htab->srelbss, &rel);
5483 }
5484
5485 return TRUE;
5486 }
5487
5488 /* Finish up local dynamic symbol handling. We set the contents of
5489 various dynamic sections here. */
5490
5491 static bfd_boolean
5492 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5493 {
5494 struct elf_link_hash_entry *h
5495 = (struct elf_link_hash_entry *) *slot;
5496 struct bfd_link_info *info
5497 = (struct bfd_link_info *) inf;
5498
5499 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5500 h, NULL);
5501 }
5502
5503 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5504 here since undefined weak symbol may not be dynamic and may not be
5505 called for elf_i386_finish_dynamic_symbol. */
5506
5507 static bfd_boolean
5508 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5509 void *inf)
5510 {
5511 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5512 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5513
5514 if (h->root.type != bfd_link_hash_undefweak
5515 || h->dynindx != -1)
5516 return TRUE;
5517
5518 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5519 info, h, NULL);
5520 }
5521
5522 /* Used to decide how to sort relocs in an optimal manner for the
5523 dynamic linker, before writing them out. */
5524
5525 static enum elf_reloc_type_class
5526 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5527 const asection *rel_sec ATTRIBUTE_UNUSED,
5528 const Elf_Internal_Rela *rela)
5529 {
5530 bfd *abfd = info->output_bfd;
5531 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5532 struct elf_link_hash_table *htab = elf_hash_table (info);
5533
5534 if (htab->dynsym != NULL
5535 && htab->dynsym->contents != NULL)
5536 {
5537 /* Check relocation against STT_GNU_IFUNC symbol if there are
5538 dynamic symbols. */
5539 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5540 Elf_Internal_Sym sym;
5541 if (!bed->s->swap_symbol_in (abfd,
5542 (htab->dynsym->contents
5543 + r_symndx * sizeof (Elf32_External_Sym)),
5544 0, &sym))
5545 abort ();
5546
5547 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5548 return reloc_class_ifunc;
5549 }
5550
5551 switch (ELF32_R_TYPE (rela->r_info))
5552 {
5553 case R_386_RELATIVE:
5554 return reloc_class_relative;
5555 case R_386_JUMP_SLOT:
5556 return reloc_class_plt;
5557 case R_386_COPY:
5558 return reloc_class_copy;
5559 default:
5560 return reloc_class_normal;
5561 }
5562 }
5563
5564 /* Finish up the dynamic sections. */
5565
5566 static bfd_boolean
5567 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5568 struct bfd_link_info *info)
5569 {
5570 struct elf_i386_link_hash_table *htab;
5571 bfd *dynobj;
5572 asection *sdyn;
5573 const struct elf_i386_backend_data *abed;
5574
5575 htab = elf_i386_hash_table (info);
5576 if (htab == NULL)
5577 return FALSE;
5578
5579 dynobj = htab->elf.dynobj;
5580 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5581 abed = get_elf_i386_backend_data (output_bfd);
5582
5583 if (htab->elf.dynamic_sections_created)
5584 {
5585 Elf32_External_Dyn *dyncon, *dynconend;
5586
5587 if (sdyn == NULL || htab->elf.sgot == NULL)
5588 abort ();
5589
5590 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5591 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5592 for (; dyncon < dynconend; dyncon++)
5593 {
5594 Elf_Internal_Dyn dyn;
5595 asection *s;
5596
5597 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5598
5599 switch (dyn.d_tag)
5600 {
5601 default:
5602 if (abed->is_vxworks
5603 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5604 break;
5605 continue;
5606
5607 case DT_PLTGOT:
5608 s = htab->elf.sgotplt;
5609 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5610 break;
5611
5612 case DT_JMPREL:
5613 s = htab->elf.srelplt;
5614 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5615 break;
5616
5617 case DT_PLTRELSZ:
5618 s = htab->elf.srelplt;
5619 dyn.d_un.d_val = s->size;
5620 break;
5621
5622 case DT_RELSZ:
5623 /* My reading of the SVR4 ABI indicates that the
5624 procedure linkage table relocs (DT_JMPREL) should be
5625 included in the overall relocs (DT_REL). This is
5626 what Solaris does. However, UnixWare can not handle
5627 that case. Therefore, we override the DT_RELSZ entry
5628 here to make it not include the JMPREL relocs. */
5629 s = htab->elf.srelplt;
5630 if (s == NULL)
5631 continue;
5632 dyn.d_un.d_val -= s->size;
5633 break;
5634
5635 case DT_REL:
5636 /* We may not be using the standard ELF linker script.
5637 If .rel.plt is the first .rel section, we adjust
5638 DT_REL to not include it. */
5639 s = htab->elf.srelplt;
5640 if (s == NULL)
5641 continue;
5642 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5643 continue;
5644 dyn.d_un.d_ptr += s->size;
5645 break;
5646 }
5647
5648 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5649 }
5650
5651 /* Fill in the first entry in the procedure linkage table. */
5652 if (htab->elf.splt && htab->elf.splt->size > 0)
5653 {
5654 if (bfd_link_pic (info))
5655 {
5656 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5657 abed->plt->plt0_entry_size);
5658 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5659 abed->plt0_pad_byte,
5660 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5661 }
5662 else
5663 {
5664 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5665 abed->plt->plt0_entry_size);
5666 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5667 abed->plt0_pad_byte,
5668 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5669 bfd_put_32 (output_bfd,
5670 (htab->elf.sgotplt->output_section->vma
5671 + htab->elf.sgotplt->output_offset
5672 + 4),
5673 htab->elf.splt->contents
5674 + abed->plt->plt0_got1_offset);
5675 bfd_put_32 (output_bfd,
5676 (htab->elf.sgotplt->output_section->vma
5677 + htab->elf.sgotplt->output_offset
5678 + 8),
5679 htab->elf.splt->contents
5680 + abed->plt->plt0_got2_offset);
5681
5682 if (abed->is_vxworks)
5683 {
5684 Elf_Internal_Rela rel;
5685
5686 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5687 On IA32 we use REL relocations so the addend goes in
5688 the PLT directly. */
5689 rel.r_offset = (htab->elf.splt->output_section->vma
5690 + htab->elf.splt->output_offset
5691 + abed->plt->plt0_got1_offset);
5692 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5693 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5694 htab->srelplt2->contents);
5695 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5696 rel.r_offset = (htab->elf.splt->output_section->vma
5697 + htab->elf.splt->output_offset
5698 + abed->plt->plt0_got2_offset);
5699 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5700 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5701 htab->srelplt2->contents +
5702 sizeof (Elf32_External_Rel));
5703 }
5704 }
5705
5706 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5707 really seem like the right value. */
5708 elf_section_data (htab->elf.splt->output_section)
5709 ->this_hdr.sh_entsize = 4;
5710
5711 /* Correct the .rel.plt.unloaded relocations. */
5712 if (abed->is_vxworks && !bfd_link_pic (info))
5713 {
5714 int num_plts = (htab->elf.splt->size
5715 / abed->plt->plt_entry_size) - 1;
5716 unsigned char *p;
5717
5718 p = htab->srelplt2->contents;
5719 if (bfd_link_pic (info))
5720 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5721 else
5722 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5723
5724 for (; num_plts; num_plts--)
5725 {
5726 Elf_Internal_Rela rel;
5727 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5728 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5729 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5730 p += sizeof (Elf32_External_Rel);
5731
5732 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5733 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5734 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5735 p += sizeof (Elf32_External_Rel);
5736 }
5737 }
5738 }
5739 }
5740
5741 if (htab->elf.sgotplt)
5742 {
5743 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5744 {
5745 (*_bfd_error_handler)
5746 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5747 return FALSE;
5748 }
5749
5750 /* Fill in the first three entries in the global offset table. */
5751 if (htab->elf.sgotplt->size > 0)
5752 {
5753 bfd_put_32 (output_bfd,
5754 (sdyn == NULL ? 0
5755 : sdyn->output_section->vma + sdyn->output_offset),
5756 htab->elf.sgotplt->contents);
5757 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5758 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5759 }
5760
5761 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5762 }
5763
5764 /* Adjust .eh_frame for .plt section. */
5765 if (htab->plt_eh_frame != NULL
5766 && htab->plt_eh_frame->contents != NULL)
5767 {
5768 if (htab->elf.splt != NULL
5769 && htab->elf.splt->size != 0
5770 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5771 && htab->elf.splt->output_section != NULL
5772 && htab->plt_eh_frame->output_section != NULL)
5773 {
5774 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5775 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5776 + htab->plt_eh_frame->output_offset
5777 + PLT_FDE_START_OFFSET;
5778 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5779 htab->plt_eh_frame->contents
5780 + PLT_FDE_START_OFFSET);
5781 }
5782 if (htab->plt_eh_frame->sec_info_type
5783 == SEC_INFO_TYPE_EH_FRAME)
5784 {
5785 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5786 htab->plt_eh_frame,
5787 htab->plt_eh_frame->contents))
5788 return FALSE;
5789 }
5790 }
5791
5792 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5793 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5794
5795 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5796 htab_traverse (htab->loc_hash_table,
5797 elf_i386_finish_local_dynamic_symbol,
5798 info);
5799
5800 /* Fill PLT entries for undefined weak symbols in PIE. */
5801 if (bfd_link_pie (info))
5802 bfd_hash_traverse (&info->hash->table,
5803 elf_i386_pie_finish_undefweak_symbol,
5804 info);
5805
5806 return TRUE;
5807 }
5808
5809 /* Return an array of PLT entry symbol values. */
5810
5811 static bfd_vma *
5812 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5813 asection *relplt)
5814 {
5815 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5816 arelent *p;
5817 long count, i;
5818 bfd_vma *plt_sym_val;
5819 bfd_vma plt_offset;
5820 bfd_byte *plt_contents;
5821 const struct elf_i386_backend_data *bed
5822 = get_elf_i386_backend_data (abfd);
5823 Elf_Internal_Shdr *hdr;
5824
5825 /* Get the .plt section contents. */
5826 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5827 if (plt_contents == NULL)
5828 return NULL;
5829 if (!bfd_get_section_contents (abfd, (asection *) plt,
5830 plt_contents, 0, plt->size))
5831 {
5832 bad_return:
5833 free (plt_contents);
5834 return NULL;
5835 }
5836
5837 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5838 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5839 goto bad_return;
5840
5841 hdr = &elf_section_data (relplt)->this_hdr;
5842 count = relplt->size / hdr->sh_entsize;
5843
5844 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5845 if (plt_sym_val == NULL)
5846 goto bad_return;
5847
5848 for (i = 0; i < count; i++)
5849 plt_sym_val[i] = -1;
5850
5851 plt_offset = bed->plt->plt_entry_size;
5852 p = relplt->relocation;
5853 for (i = 0; i < count; i++, p++)
5854 {
5855 long reloc_index;
5856
5857 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5858 if (p->howto == NULL)
5859 continue;
5860
5861 if (p->howto->type != R_386_JUMP_SLOT
5862 && p->howto->type != R_386_IRELATIVE)
5863 continue;
5864
5865 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5866 + bed->plt->plt_reloc_offset));
5867 reloc_index /= sizeof (Elf32_External_Rel);
5868 if (reloc_index < count)
5869 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5870
5871 plt_offset += bed->plt->plt_entry_size;
5872
5873 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5874 section. */
5875 if (plt_offset >= plt->size)
5876 break;
5877 }
5878
5879 free (plt_contents);
5880
5881 return plt_sym_val;
5882 }
5883
5884 /* Similar to _bfd_elf_get_synthetic_symtab. */
5885
5886 static long
5887 elf_i386_get_synthetic_symtab (bfd *abfd,
5888 long symcount,
5889 asymbol **syms,
5890 long dynsymcount,
5891 asymbol **dynsyms,
5892 asymbol **ret)
5893 {
5894 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5895 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5896 dynsymcount, dynsyms, ret,
5897 plt,
5898 elf_i386_get_plt_sym_val);
5899 }
5900
5901 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5902
5903 static bfd_boolean
5904 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5905 {
5906 if (h->plt.offset != (bfd_vma) -1
5907 && !h->def_regular
5908 && !h->pointer_equality_needed)
5909 return FALSE;
5910
5911 return _bfd_elf_hash_symbol (h);
5912 }
5913
5914 /* Hook called by the linker routine which adds symbols from an object
5915 file. */
5916
5917 static bfd_boolean
5918 elf_i386_add_symbol_hook (bfd * abfd,
5919 struct bfd_link_info * info,
5920 Elf_Internal_Sym * sym,
5921 const char ** namep ATTRIBUTE_UNUSED,
5922 flagword * flagsp ATTRIBUTE_UNUSED,
5923 asection ** secp ATTRIBUTE_UNUSED,
5924 bfd_vma * valp ATTRIBUTE_UNUSED)
5925 {
5926 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5927 && (abfd->flags & DYNAMIC) == 0
5928 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5929 elf_tdata (info->output_bfd)->has_gnu_symbols
5930 |= elf_gnu_symbol_unique;
5931
5932 return TRUE;
5933 }
5934
5935 #define TARGET_LITTLE_SYM i386_elf32_vec
5936 #define TARGET_LITTLE_NAME "elf32-i386"
5937 #define ELF_ARCH bfd_arch_i386
5938 #define ELF_TARGET_ID I386_ELF_DATA
5939 #define ELF_MACHINE_CODE EM_386
5940 #define ELF_MAXPAGESIZE 0x1000
5941
5942 #define elf_backend_can_gc_sections 1
5943 #define elf_backend_can_refcount 1
5944 #define elf_backend_want_got_plt 1
5945 #define elf_backend_plt_readonly 1
5946 #define elf_backend_want_plt_sym 0
5947 #define elf_backend_got_header_size 12
5948 #define elf_backend_plt_alignment 4
5949 #define elf_backend_extern_protected_data 1
5950
5951 /* Support RELA for objdump of prelink objects. */
5952 #define elf_info_to_howto elf_i386_info_to_howto_rel
5953 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5954
5955 #define bfd_elf32_mkobject elf_i386_mkobject
5956
5957 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5958 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5959 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5960 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5961 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5962
5963 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5964 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5965 #define elf_backend_check_relocs elf_i386_check_relocs
5966 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5967 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5968 #define elf_backend_fake_sections elf_i386_fake_sections
5969 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5970 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5971 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5972 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5973 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5974 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5975 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5976 #define elf_backend_relocate_section elf_i386_relocate_section
5977 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5978 #define elf_backend_always_size_sections elf_i386_always_size_sections
5979 #define elf_backend_omit_section_dynsym \
5980 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5981 #define elf_backend_hash_symbol elf_i386_hash_symbol
5982 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5983 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
5984
5985 #include "elf32-target.h"
5986
5987 /* FreeBSD support. */
5988
5989 #undef TARGET_LITTLE_SYM
5990 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5991 #undef TARGET_LITTLE_NAME
5992 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5993 #undef ELF_OSABI
5994 #define ELF_OSABI ELFOSABI_FREEBSD
5995
5996 /* The kernel recognizes executables as valid only if they carry a
5997 "FreeBSD" label in the ELF header. So we put this label on all
5998 executables and (for simplicity) also all other object files. */
5999
6000 static void
6001 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
6002 {
6003 _bfd_elf_post_process_headers (abfd, info);
6004
6005 #ifdef OLD_FREEBSD_ABI_LABEL
6006 {
6007 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6008 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6009 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6010 }
6011 #endif
6012 }
6013
6014 #undef elf_backend_post_process_headers
6015 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6016 #undef elf32_bed
6017 #define elf32_bed elf32_i386_fbsd_bed
6018
6019 #undef elf_backend_add_symbol_hook
6020
6021 #include "elf32-target.h"
6022
6023 /* Solaris 2. */
6024
6025 #undef TARGET_LITTLE_SYM
6026 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6027 #undef TARGET_LITTLE_NAME
6028 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
6029
6030 #undef elf_backend_post_process_headers
6031
6032 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6033 objects won't be recognized. */
6034 #undef ELF_OSABI
6035
6036 #undef elf32_bed
6037 #define elf32_bed elf32_i386_sol2_bed
6038
6039 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6040 boundary. */
6041 #undef elf_backend_static_tls_alignment
6042 #define elf_backend_static_tls_alignment 8
6043
6044 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6045
6046 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6047 File, p.63. */
6048 #undef elf_backend_want_plt_sym
6049 #define elf_backend_want_plt_sym 1
6050
6051 #include "elf32-target.h"
6052
6053 /* Intel MCU support. */
6054
6055 static bfd_boolean
6056 elf32_iamcu_elf_object_p (bfd *abfd)
6057 {
6058 /* Set the right machine number for an IAMCU elf32 file. */
6059 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6060 return TRUE;
6061 }
6062
6063 #undef TARGET_LITTLE_SYM
6064 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6065 #undef TARGET_LITTLE_NAME
6066 #define TARGET_LITTLE_NAME "elf32-iamcu"
6067 #undef ELF_ARCH
6068 #define ELF_ARCH bfd_arch_iamcu
6069
6070 #undef ELF_MACHINE_CODE
6071 #define ELF_MACHINE_CODE EM_IAMCU
6072
6073 #undef ELF_OSABI
6074
6075 #undef elf32_bed
6076 #define elf32_bed elf32_iamcu_bed
6077
6078 #undef elf_backend_object_p
6079 #define elf_backend_object_p elf32_iamcu_elf_object_p
6080
6081 #undef elf_backend_static_tls_alignment
6082
6083 #undef elf_backend_want_plt_sym
6084 #define elf_backend_want_plt_sym 0
6085
6086 #include "elf32-target.h"
6087
6088 /* Restore defaults. */
6089 #undef ELF_ARCH
6090 #define ELF_ARCH bfd_arch_i386
6091 #undef ELF_MACHINE_CODE
6092 #define ELF_MACHINE_CODE EM_386
6093
6094 /* Native Client support. */
6095
6096 #undef TARGET_LITTLE_SYM
6097 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6098 #undef TARGET_LITTLE_NAME
6099 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6100 #undef elf32_bed
6101 #define elf32_bed elf32_i386_nacl_bed
6102
6103 #undef ELF_MAXPAGESIZE
6104 #define ELF_MAXPAGESIZE 0x10000
6105
6106 /* Restore defaults. */
6107 #undef ELF_OSABI
6108 #undef elf_backend_want_plt_sym
6109 #define elf_backend_want_plt_sym 0
6110 #undef elf_backend_post_process_headers
6111 #undef elf_backend_static_tls_alignment
6112
6113 /* NaCl uses substantially different PLT entries for the same effects. */
6114
6115 #undef elf_backend_plt_alignment
6116 #define elf_backend_plt_alignment 5
6117 #define NACL_PLT_ENTRY_SIZE 64
6118 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6119
6120 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6121 {
6122 0xff, 0x35, /* pushl contents of address */
6123 0, 0, 0, 0, /* replaced with address of .got + 4. */
6124 0x8b, 0x0d, /* movl contents of address, %ecx */
6125 0, 0, 0, 0, /* replaced with address of .got + 8. */
6126 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6127 0xff, 0xe1 /* jmp *%ecx */
6128 };
6129
6130 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6131 {
6132 0x8b, 0x0d, /* movl contents of address, %ecx */
6133 0, 0, 0, 0, /* replaced with GOT slot address. */
6134 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6135 0xff, 0xe1, /* jmp *%ecx */
6136
6137 /* Pad to the next 32-byte boundary with nop instructions. */
6138 0x90,
6139 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6140 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6141
6142 /* Lazy GOT entries point here (32-byte aligned). */
6143 0x68, /* pushl immediate */
6144 0, 0, 0, 0, /* replaced with reloc offset. */
6145 0xe9, /* jmp relative */
6146 0, 0, 0, 0, /* replaced with offset to .plt. */
6147
6148 /* Pad to the next 32-byte boundary with nop instructions. */
6149 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6150 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6151 0x90, 0x90
6152 };
6153
6154 static const bfd_byte
6155 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6156 {
6157 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6158 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6159 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6160 0xff, 0xe1, /* jmp *%ecx */
6161
6162 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6163 so pad to that size with nop instructions. */
6164 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6165 };
6166
6167 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6168 {
6169 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6170 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6171 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6172 0xff, 0xe1, /* jmp *%ecx */
6173
6174 /* Pad to the next 32-byte boundary with nop instructions. */
6175 0x90,
6176 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6177 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6178
6179 /* Lazy GOT entries point here (32-byte aligned). */
6180 0x68, /* pushl immediate */
6181 0, 0, 0, 0, /* replaced with offset into relocation table. */
6182 0xe9, /* jmp relative */
6183 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6184
6185 /* Pad to the next 32-byte boundary with nop instructions. */
6186 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6187 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6188 0x90, 0x90
6189 };
6190
6191 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6192 {
6193 #if (PLT_CIE_LENGTH != 20 \
6194 || PLT_FDE_LENGTH != 36 \
6195 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6196 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6197 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6198 #endif
6199 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6200 0, 0, 0, 0, /* CIE ID */
6201 1, /* CIE version */
6202 'z', 'R', 0, /* Augmentation string */
6203 1, /* Code alignment factor */
6204 0x7c, /* Data alignment factor: -4 */
6205 8, /* Return address column */
6206 1, /* Augmentation size */
6207 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6208 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6209 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6210 DW_CFA_nop, DW_CFA_nop,
6211
6212 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6213 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6214 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6215 0, 0, 0, 0, /* .plt size goes here */
6216 0, /* Augmentation size */
6217 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6218 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6219 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6220 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6221 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6222 13, /* Block length */
6223 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6224 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6225 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6226 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6227 DW_CFA_nop, DW_CFA_nop
6228 };
6229
6230 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6231 {
6232 elf_i386_nacl_plt0_entry, /* plt0_entry */
6233 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6234 2, /* plt0_got1_offset */
6235 8, /* plt0_got2_offset */
6236 elf_i386_nacl_plt_entry, /* plt_entry */
6237 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6238 2, /* plt_got_offset */
6239 33, /* plt_reloc_offset */
6240 38, /* plt_plt_offset */
6241 32, /* plt_lazy_offset */
6242 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6243 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6244 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6245 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6246 };
6247
6248 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6249 {
6250 &elf_i386_nacl_plt, /* plt */
6251 0x90, /* plt0_pad_byte: nop insn */
6252 0, /* is_vxworks */
6253 };
6254
6255 static bfd_boolean
6256 elf32_i386_nacl_elf_object_p (bfd *abfd)
6257 {
6258 /* Set the right machine number for a NaCl i386 ELF32 file. */
6259 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6260 return TRUE;
6261 }
6262
6263 #undef elf_backend_arch_data
6264 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6265
6266 #undef elf_backend_object_p
6267 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6268 #undef elf_backend_modify_segment_map
6269 #define elf_backend_modify_segment_map nacl_modify_segment_map
6270 #undef elf_backend_modify_program_headers
6271 #define elf_backend_modify_program_headers nacl_modify_program_headers
6272 #undef elf_backend_final_write_processing
6273 #define elf_backend_final_write_processing nacl_final_write_processing
6274
6275 #include "elf32-target.h"
6276
6277 /* Restore defaults. */
6278 #undef elf_backend_object_p
6279 #undef elf_backend_modify_segment_map
6280 #undef elf_backend_modify_program_headers
6281 #undef elf_backend_final_write_processing
6282
6283 /* VxWorks support. */
6284
6285 #undef TARGET_LITTLE_SYM
6286 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6287 #undef TARGET_LITTLE_NAME
6288 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6289 #undef ELF_OSABI
6290 #undef elf_backend_plt_alignment
6291 #define elf_backend_plt_alignment 4
6292
6293 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6294 {
6295 &elf_i386_plt, /* plt */
6296 0x90, /* plt0_pad_byte */
6297 1, /* is_vxworks */
6298 };
6299
6300 #undef elf_backend_arch_data
6301 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6302
6303 #undef elf_backend_relocs_compatible
6304 #undef elf_backend_add_symbol_hook
6305 #define elf_backend_add_symbol_hook \
6306 elf_vxworks_add_symbol_hook
6307 #undef elf_backend_link_output_symbol_hook
6308 #define elf_backend_link_output_symbol_hook \
6309 elf_vxworks_link_output_symbol_hook
6310 #undef elf_backend_emit_relocs
6311 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6312 #undef elf_backend_final_write_processing
6313 #define elf_backend_final_write_processing \
6314 elf_vxworks_final_write_processing
6315 #undef elf_backend_static_tls_alignment
6316
6317 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6318 define it. */
6319 #undef elf_backend_want_plt_sym
6320 #define elf_backend_want_plt_sym 1
6321
6322 #undef elf32_bed
6323 #define elf32_bed elf32_i386_vxworks_bed
6324
6325 #include "elf32-target.h"
GDB Binutils - Deliverables
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