x86: Generate PLT relocations for -z now
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "opcode/i386.h"
33
34 /* 386 uses REL relocations instead of RELA. */
35 #define USE_REL 1
36
37 #include "elf/i386.h"
38
39 static reloc_howto_type elf_howto_table[]=
40 {
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
74
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
81
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
113
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
153
154 /* Another gap. */
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
157
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
160 0, /* rightshift */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
162 0, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
169 0, /* src_mask */
170 0, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 0, /* bitsize */
178 FALSE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0, /* dst_mask */
186 FALSE) /* pcrel_offset */
187
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
189
190 };
191
192 #ifdef DEBUG_GEN_RELOC
193 #define TRACE(str) \
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 #else
196 #define TRACE(str)
197 #endif
198
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
202 {
203 switch (code)
204 {
205 case BFD_RELOC_NONE:
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
208
209 case BFD_RELOC_32:
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_CTOR:
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
216
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
220
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
224
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
228
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
232
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
236
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
240
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
244
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
248
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
252
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
273
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
277
278 case BFD_RELOC_16:
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
281
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
285
286 case BFD_RELOC_8:
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
289
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
293
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
318
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
330
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
334
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
338
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
342
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
346
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
350
351 default:
352 break;
353 }
354
355 TRACE ("Unknown");
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
369
370 return NULL;
371 }
372
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
375 {
376 unsigned int indx;
377
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
385 {
386 /* xgettext:c-format */
387 _bfd_error_handler (_("%B: invalid relocation type %d"),
388 abfd, (int) r_type);
389 indx = R_386_NONE;
390 }
391 /* PR 17512: file: 0f67f69d. */
392 if (elf_howto_table [indx].type != r_type)
393 return NULL;
394 return &elf_howto_table[indx];
395 }
396
397 static void
398 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
399 arelent *cache_ptr,
400 Elf_Internal_Rela *dst)
401 {
402 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
403 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
404 }
405
406 /* Return whether a symbol name implies a local label. The UnixWare
407 2.1 cc generates temporary symbols that start with .X, so we
408 recognize them here. FIXME: do other SVR4 compilers also use .X?.
409 If so, we should move the .X recognition into
410 _bfd_elf_is_local_label_name. */
411
412 static bfd_boolean
413 elf_i386_is_local_label_name (bfd *abfd, const char *name)
414 {
415 if (name[0] == '.' && name[1] == 'X')
416 return TRUE;
417
418 return _bfd_elf_is_local_label_name (abfd, name);
419 }
420 \f
421 /* Support for core dump NOTE sections. */
422
423 static bfd_boolean
424 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
425 {
426 int offset;
427 size_t size;
428
429 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
430 {
431 int pr_version = bfd_get_32 (abfd, note->descdata);
432
433 if (pr_version != 1)
434 return FALSE;
435
436 /* pr_cursig */
437 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
438
439 /* pr_pid */
440 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
441
442 /* pr_reg */
443 offset = 28;
444 size = bfd_get_32 (abfd, note->descdata + 8);
445 }
446 else
447 {
448 switch (note->descsz)
449 {
450 default:
451 return FALSE;
452
453 case 144: /* Linux/i386 */
454 /* pr_cursig */
455 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
456
457 /* pr_pid */
458 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
459
460 /* pr_reg */
461 offset = 72;
462 size = 68;
463
464 break;
465 }
466 }
467
468 /* Make a ".reg/999" section. */
469 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
470 size, note->descpos + offset);
471 }
472
473 static bfd_boolean
474 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
475 {
476 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
477 {
478 int pr_version = bfd_get_32 (abfd, note->descdata);
479
480 if (pr_version != 1)
481 return FALSE;
482
483 elf_tdata (abfd)->core->program
484 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
485 elf_tdata (abfd)->core->command
486 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
487 }
488 else
489 {
490 switch (note->descsz)
491 {
492 default:
493 return FALSE;
494
495 case 124: /* Linux/i386 elf_prpsinfo. */
496 elf_tdata (abfd)->core->pid
497 = bfd_get_32 (abfd, note->descdata + 12);
498 elf_tdata (abfd)->core->program
499 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
500 elf_tdata (abfd)->core->command
501 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
502 }
503 }
504
505 /* Note that for some reason, a spurious space is tacked
506 onto the end of the args in some (at least one anyway)
507 implementations, so strip it off if it exists. */
508 {
509 char *command = elf_tdata (abfd)->core->command;
510 int n = strlen (command);
511
512 if (0 < n && command[n - 1] == ' ')
513 command[n - 1] = '\0';
514 }
515
516 return TRUE;
517 }
518 \f
519 /* Functions for the i386 ELF linker.
520
521 In order to gain some understanding of code in this file without
522 knowing all the intricate details of the linker, note the
523 following:
524
525 Functions named elf_i386_* are called by external routines, other
526 functions are only called locally. elf_i386_* functions appear
527 in this file more or less in the order in which they are called
528 from external routines. eg. elf_i386_check_relocs is called
529 early in the link process, elf_i386_finish_dynamic_sections is
530 one of the last functions. */
531
532
533 /* The name of the dynamic interpreter. This is put in the .interp
534 section. */
535
536 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
537
538 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
539 copying dynamic variables from a shared lib into an app's dynbss
540 section, and instead use a dynamic relocation to point into the
541 shared lib. */
542 #define ELIMINATE_COPY_RELOCS 1
543
544 /* The size in bytes of an entry in the lazy procedure linkage table. */
545
546 #define LAZY_PLT_ENTRY_SIZE 16
547
548 /* The size in bytes of an entry in the non-lazy procedure linkage
549 table. */
550
551 #define NON_LAZY_PLT_ENTRY_SIZE 8
552
553 /* The first entry in an absolute lazy procedure linkage table looks
554 like this. See the SVR4 ABI i386 supplement to see how this works.
555 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
556
557 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
558 {
559 0xff, 0x35, /* pushl contents of address */
560 0, 0, 0, 0, /* replaced with address of .got + 4. */
561 0xff, 0x25, /* jmp indirect */
562 0, 0, 0, 0 /* replaced with address of .got + 8. */
563 };
564
565 /* Subsequent entries in an absolute lazy procedure linkage table look
566 like this. */
567
568 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
569 {
570 0xff, 0x25, /* jmp indirect */
571 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
572 0x68, /* pushl immediate */
573 0, 0, 0, 0, /* replaced with offset into relocation table. */
574 0xe9, /* jmp relative */
575 0, 0, 0, 0 /* replaced with offset to start of .plt. */
576 };
577
578 /* The first entry in a PIC lazy procedure linkage table look like
579 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
580 lazy_plt->plt0_pad_byte. */
581
582 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
583 {
584 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
585 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
586 };
587
588 /* Subsequent entries in a PIC lazy procedure linkage table look like
589 this. */
590
591 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
592 {
593 0xff, 0xa3, /* jmp *offset(%ebx) */
594 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
595 0x68, /* pushl immediate */
596 0, 0, 0, 0, /* replaced with offset into relocation table. */
597 0xe9, /* jmp relative */
598 0, 0, 0, 0 /* replaced with offset to start of .plt. */
599 };
600
601 /* Entries in the non-lazy procedure linkage table look like this. */
602
603 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
604 {
605 0xff, 0x25, /* jmp indirect */
606 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
607 0x66, 0x90 /* xchg %ax,%ax */
608 };
609
610 /* Entries in the PIC non-lazy procedure linkage table look like
611 this. */
612
613 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
614 {
615 0xff, 0xa3, /* jmp *offset(%ebx) */
616 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
617 0x66, 0x90 /* xchg %ax,%ax */
618 };
619
620 /* .eh_frame covering the lazy .plt section. */
621
622 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
623 {
624 #define PLT_CIE_LENGTH 20
625 #define PLT_FDE_LENGTH 36
626 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
627 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
628 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
629 0, 0, 0, 0, /* CIE ID */
630 1, /* CIE version */
631 'z', 'R', 0, /* Augmentation string */
632 1, /* Code alignment factor */
633 0x7c, /* Data alignment factor */
634 8, /* Return address column */
635 1, /* Augmentation size */
636 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
637 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
638 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
639 DW_CFA_nop, DW_CFA_nop,
640
641 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
642 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
643 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
644 0, 0, 0, 0, /* .plt size goes here */
645 0, /* Augmentation size */
646 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
647 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
648 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
649 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
650 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
651 11, /* Block length */
652 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
653 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
654 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
655 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
656 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
657 };
658
659 /* .eh_frame covering the non-lazy .plt section. */
660
661 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
662 {
663 #define PLT_GOT_FDE_LENGTH 16
664 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
665 0, 0, 0, 0, /* CIE ID */
666 1, /* CIE version */
667 'z', 'R', 0, /* Augmentation string */
668 1, /* Code alignment factor */
669 0x7c, /* Data alignment factor */
670 8, /* Return address column */
671 1, /* Augmentation size */
672 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
673 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
674 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
675 DW_CFA_nop, DW_CFA_nop,
676
677 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
678 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
679 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
680 0, 0, 0, 0, /* non-lazy .plt size goes here */
681 0, /* Augmentation size */
682 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
683 };
684
685 struct elf_i386_lazy_plt_layout
686 {
687 /* The first entry in an absolute lazy procedure linkage table looks
688 like this. */
689 const bfd_byte *plt0_entry;
690 unsigned int plt0_entry_size;
691
692 /* Offsets into plt0_entry that are to be replaced with GOT[1] and
693 GOT[2]. */
694 unsigned int plt0_got1_offset;
695 unsigned int plt0_got2_offset;
696
697 /* Later entries in an absolute lazy procedure linkage table look
698 like this. */
699 const bfd_byte *plt_entry;
700 unsigned int plt_entry_size;
701
702 /* Offsets into plt_entry that are to be replaced with... */
703 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
704 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
705 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
706
707 /* Offset into plt_entry where the initial value of the GOT entry
708 points. */
709 unsigned int plt_lazy_offset;
710
711 /* The first entry in a PIC lazy procedure linkage table looks like
712 this. */
713 const bfd_byte *pic_plt0_entry;
714
715 /* Subsequent entries in a PIC lazy procedure linkage table look
716 like this. */
717 const bfd_byte *pic_plt_entry;
718
719 /* .eh_frame covering the lazy .plt section. */
720 const bfd_byte *eh_frame_plt;
721 unsigned int eh_frame_plt_size;
722 };
723
724 struct elf_i386_non_lazy_plt_layout
725 {
726 /* Entries in an absolute non-lazy procedure linkage table look like
727 this. */
728 const bfd_byte *plt_entry;
729 /* Entries in a PIC non-lazy procedure linkage table look like this. */
730 const bfd_byte *pic_plt_entry;
731
732 unsigned int plt_entry_size;
733
734 /* Offsets into plt_entry that are to be replaced with... */
735 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
736
737 /* .eh_frame covering the non-lazy .plt section. */
738 const bfd_byte *eh_frame_plt;
739 unsigned int eh_frame_plt_size;
740 };
741
742 struct elf_i386_plt_layout
743 {
744 /* The first entry in a lazy procedure linkage table looks like this. */
745 const bfd_byte *plt0_entry;
746 /* Entries in a procedure linkage table look like this. */
747 const bfd_byte *plt_entry;
748 unsigned int plt_entry_size;
749
750 /* 1 has PLT0. */
751 unsigned int has_plt0;
752
753 /* Offsets into plt_entry that are to be replaced with... */
754 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
755
756 /* .eh_frame covering the .plt section. */
757 const bfd_byte *eh_frame_plt;
758 unsigned int eh_frame_plt_size;
759 };
760
761 /* These are the standard parameters. */
762 static const struct elf_i386_lazy_plt_layout elf_i386_lazy_plt =
763 {
764 elf_i386_lazy_plt0_entry, /* plt0_entry */
765 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
766 2, /* plt0_got1_offset */
767 8, /* plt0_got2_offset */
768 elf_i386_lazy_plt_entry, /* plt_entry */
769 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
770 2, /* plt_got_offset */
771 7, /* plt_reloc_offset */
772 12, /* plt_plt_offset */
773 6, /* plt_lazy_offset */
774 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
775 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
776 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
777 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
778 };
779
780 static const struct elf_i386_non_lazy_plt_layout elf_i386_non_lazy_plt =
781 {
782 elf_i386_non_lazy_plt_entry, /* plt_entry */
783 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
784 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
785 2, /* plt_got_offset */
786 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
787 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
788 };
789 \f
790
791 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
792 for the PLTResolve stub and then for each PLT entry. */
793 #define PLTRESOLVE_RELOCS_SHLIB 0
794 #define PLTRESOLVE_RELOCS 2
795 #define PLT_NON_JUMP_SLOT_RELOCS 2
796
797 /* Architecture-specific backend data for i386. */
798
799 struct elf_i386_backend_data
800 {
801 /* Value used to fill the unused bytes of the first PLT entry. */
802 bfd_byte plt0_pad_byte;
803
804 /* Target system. */
805 enum
806 {
807 is_normal,
808 is_vxworks,
809 is_nacl
810 } os;
811 };
812
813 #define get_elf_i386_backend_data(abfd) \
814 ((const struct elf_i386_backend_data *) \
815 get_elf_backend_data (abfd)->arch_data)
816
817 /* These are the standard parameters. */
818 static const struct elf_i386_backend_data elf_i386_arch_bed =
819 {
820 0, /* plt0_pad_byte */
821 is_normal /* os */
822 };
823
824 #define elf_backend_arch_data &elf_i386_arch_bed
825
826 /* Is a undefined weak symbol which is resolved to 0. Reference to an
827 undefined weak symbol is resolved to 0 when building executable if
828 it isn't dynamic and
829 1. Has non-GOT/non-PLT relocations in text section. Or
830 2. Has no GOT/PLT relocation.
831 */
832 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
833 ((EH)->elf.root.type == bfd_link_hash_undefweak \
834 && bfd_link_executable (INFO) \
835 && (elf_i386_hash_table (INFO)->interp == NULL \
836 || !(GOT_RELOC) \
837 || (EH)->has_non_got_reloc \
838 || !(INFO)->dynamic_undefined_weak))
839
840 /* i386 ELF linker hash entry. */
841
842 struct elf_i386_link_hash_entry
843 {
844 struct elf_link_hash_entry elf;
845
846 /* Track dynamic relocs copied for this symbol. */
847 struct elf_dyn_relocs *dyn_relocs;
848
849 #define GOT_UNKNOWN 0
850 #define GOT_NORMAL 1
851 #define GOT_TLS_GD 2
852 #define GOT_TLS_IE 4
853 #define GOT_TLS_IE_POS 5
854 #define GOT_TLS_IE_NEG 6
855 #define GOT_TLS_IE_BOTH 7
856 #define GOT_TLS_GDESC 8
857 #define GOT_TLS_GD_BOTH_P(type) \
858 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
859 #define GOT_TLS_GD_P(type) \
860 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
861 #define GOT_TLS_GDESC_P(type) \
862 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
863 #define GOT_TLS_GD_ANY_P(type) \
864 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
865 unsigned char tls_type;
866
867 /* Symbol is referenced by R_386_GOTOFF relocation. */
868 unsigned int gotoff_ref : 1;
869
870 /* Symbol has GOT or PLT relocations. */
871 unsigned int has_got_reloc : 1;
872
873 /* Symbol has non-GOT/non-PLT relocations in text sections. */
874 unsigned int has_non_got_reloc : 1;
875
876 /* Don't call finish_dynamic_symbol on this symbol. */
877 unsigned int no_finish_dynamic_symbol : 1;
878
879 /* 0: symbol isn't ___tls_get_addr.
880 1: symbol is ___tls_get_addr.
881 2: symbol is unknown. */
882 unsigned int tls_get_addr : 2;
883
884 /* Reference count of C/C++ function pointer relocations in read-write
885 section which can be resolved at run-time. */
886 bfd_signed_vma func_pointer_refcount;
887
888 /* Information about the GOT PLT entry. Filled when there are both
889 GOT and PLT relocations against the same function. */
890 union gotplt_union plt_got;
891
892 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
893 starting at the end of the jump table. */
894 bfd_vma tlsdesc_got;
895 };
896
897 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
898
899 struct elf_i386_obj_tdata
900 {
901 struct elf_obj_tdata root;
902
903 /* tls_type for each local got entry. */
904 char *local_got_tls_type;
905
906 /* GOTPLT entries for TLS descriptors. */
907 bfd_vma *local_tlsdesc_gotent;
908 };
909
910 #define elf_i386_tdata(abfd) \
911 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
912
913 #define elf_i386_local_got_tls_type(abfd) \
914 (elf_i386_tdata (abfd)->local_got_tls_type)
915
916 #define elf_i386_local_tlsdesc_gotent(abfd) \
917 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
918
919 #define is_i386_elf(bfd) \
920 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
921 && elf_tdata (bfd) != NULL \
922 && elf_object_id (bfd) == I386_ELF_DATA)
923
924 static bfd_boolean
925 elf_i386_mkobject (bfd *abfd)
926 {
927 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
928 I386_ELF_DATA);
929 }
930
931 /* i386 ELF linker hash table. */
932
933 struct elf_i386_link_hash_table
934 {
935 struct elf_link_hash_table elf;
936
937 /* Short-cuts to get to dynamic linker sections. */
938 asection *interp;
939 asection *plt_eh_frame;
940 asection *plt_got;
941 asection *plt_got_eh_frame;
942
943 /* Parameters describing PLT generation. */
944 struct elf_i386_plt_layout plt;
945
946 /* Parameters describing lazy PLT generation. */
947 const struct elf_i386_lazy_plt_layout *lazy_plt;
948
949 /* Parameters describing non-lazy PLT generation. */
950 const struct elf_i386_non_lazy_plt_layout *non_lazy_plt;
951
952 union
953 {
954 bfd_signed_vma refcount;
955 bfd_vma offset;
956 } tls_ldm_got;
957
958 /* The amount of space used by the reserved portion of the sgotplt
959 section, plus whatever space is used by the jump slots. */
960 bfd_vma sgotplt_jump_table_size;
961
962 /* Small local sym cache. */
963 struct sym_cache sym_cache;
964
965 /* _TLS_MODULE_BASE_ symbol. */
966 struct bfd_link_hash_entry *tls_module_base;
967
968 /* Used by local STT_GNU_IFUNC symbols. */
969 htab_t loc_hash_table;
970 void * loc_hash_memory;
971
972 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
973 asection *srelplt2;
974
975 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
976 bfd_vma next_tls_desc_index;
977
978 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
979 bfd_vma next_jump_slot_index;
980
981 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
982 bfd_vma next_irelative_index;
983
984 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
985 to read-only sections. */
986 bfd_boolean readonly_dynrelocs_against_ifunc;
987 };
988
989 /* Get the i386 ELF linker hash table from a link_info structure. */
990
991 #define elf_i386_hash_table(p) \
992 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
993 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
994
995 #define elf_i386_compute_jump_table_size(htab) \
996 ((htab)->elf.srelplt->reloc_count * 4)
997
998 /* Create an entry in an i386 ELF linker hash table. */
999
1000 static struct bfd_hash_entry *
1001 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
1002 struct bfd_hash_table *table,
1003 const char *string)
1004 {
1005 /* Allocate the structure if it has not already been allocated by a
1006 subclass. */
1007 if (entry == NULL)
1008 {
1009 entry = (struct bfd_hash_entry *)
1010 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
1011 if (entry == NULL)
1012 return entry;
1013 }
1014
1015 /* Call the allocation method of the superclass. */
1016 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
1017 if (entry != NULL)
1018 {
1019 struct elf_i386_link_hash_entry *eh;
1020
1021 eh = (struct elf_i386_link_hash_entry *) entry;
1022 eh->dyn_relocs = NULL;
1023 eh->tls_type = GOT_UNKNOWN;
1024 eh->gotoff_ref = 0;
1025 eh->has_got_reloc = 0;
1026 eh->has_non_got_reloc = 0;
1027 eh->no_finish_dynamic_symbol = 0;
1028 eh->tls_get_addr = 2;
1029 eh->func_pointer_refcount = 0;
1030 eh->plt_got.offset = (bfd_vma) -1;
1031 eh->tlsdesc_got = (bfd_vma) -1;
1032 }
1033
1034 return entry;
1035 }
1036
1037 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
1038 for local symbol so that we can handle local STT_GNU_IFUNC symbols
1039 as global symbol. We reuse indx and dynstr_index for local symbol
1040 hash since they aren't used by global symbols in this backend. */
1041
1042 static hashval_t
1043 elf_i386_local_htab_hash (const void *ptr)
1044 {
1045 struct elf_link_hash_entry *h
1046 = (struct elf_link_hash_entry *) ptr;
1047 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
1048 }
1049
1050 /* Compare local hash entries. */
1051
1052 static int
1053 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
1054 {
1055 struct elf_link_hash_entry *h1
1056 = (struct elf_link_hash_entry *) ptr1;
1057 struct elf_link_hash_entry *h2
1058 = (struct elf_link_hash_entry *) ptr2;
1059
1060 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
1061 }
1062
1063 /* Find and/or create a hash entry for local symbol. */
1064
1065 static struct elf_link_hash_entry *
1066 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
1067 bfd *abfd, const Elf_Internal_Rela *rel,
1068 bfd_boolean create)
1069 {
1070 struct elf_i386_link_hash_entry e, *ret;
1071 asection *sec = abfd->sections;
1072 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
1073 ELF32_R_SYM (rel->r_info));
1074 void **slot;
1075
1076 e.elf.indx = sec->id;
1077 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1078 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
1079 create ? INSERT : NO_INSERT);
1080
1081 if (!slot)
1082 return NULL;
1083
1084 if (*slot)
1085 {
1086 ret = (struct elf_i386_link_hash_entry *) *slot;
1087 return &ret->elf;
1088 }
1089
1090 ret = (struct elf_i386_link_hash_entry *)
1091 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1092 sizeof (struct elf_i386_link_hash_entry));
1093 if (ret)
1094 {
1095 memset (ret, 0, sizeof (*ret));
1096 ret->elf.indx = sec->id;
1097 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1098 ret->elf.dynindx = -1;
1099 ret->func_pointer_refcount = 0;
1100 ret->plt_got.offset = (bfd_vma) -1;
1101 *slot = ret;
1102 }
1103 return &ret->elf;
1104 }
1105
1106 /* Destroy an i386 ELF linker hash table. */
1107
1108 static void
1109 elf_i386_link_hash_table_free (bfd *obfd)
1110 {
1111 struct elf_i386_link_hash_table *htab
1112 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1113
1114 if (htab->loc_hash_table)
1115 htab_delete (htab->loc_hash_table);
1116 if (htab->loc_hash_memory)
1117 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1118 _bfd_elf_link_hash_table_free (obfd);
1119 }
1120
1121 /* Create an i386 ELF linker hash table. */
1122
1123 static struct bfd_link_hash_table *
1124 elf_i386_link_hash_table_create (bfd *abfd)
1125 {
1126 struct elf_i386_link_hash_table *ret;
1127 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1128
1129 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1130 if (ret == NULL)
1131 return NULL;
1132
1133 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1134 elf_i386_link_hash_newfunc,
1135 sizeof (struct elf_i386_link_hash_entry),
1136 I386_ELF_DATA))
1137 {
1138 free (ret);
1139 return NULL;
1140 }
1141
1142 ret->loc_hash_table = htab_try_create (1024,
1143 elf_i386_local_htab_hash,
1144 elf_i386_local_htab_eq,
1145 NULL);
1146 ret->loc_hash_memory = objalloc_create ();
1147 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1148 {
1149 elf_i386_link_hash_table_free (abfd);
1150 return NULL;
1151 }
1152 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1153
1154 return &ret->elf.root;
1155 }
1156
1157 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1158
1159 static void
1160 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1161 struct elf_link_hash_entry *dir,
1162 struct elf_link_hash_entry *ind)
1163 {
1164 struct elf_i386_link_hash_entry *edir, *eind;
1165
1166 edir = (struct elf_i386_link_hash_entry *) dir;
1167 eind = (struct elf_i386_link_hash_entry *) ind;
1168
1169 if (eind->dyn_relocs != NULL)
1170 {
1171 if (edir->dyn_relocs != NULL)
1172 {
1173 struct elf_dyn_relocs **pp;
1174 struct elf_dyn_relocs *p;
1175
1176 /* Add reloc counts against the indirect sym to the direct sym
1177 list. Merge any entries against the same section. */
1178 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1179 {
1180 struct elf_dyn_relocs *q;
1181
1182 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1183 if (q->sec == p->sec)
1184 {
1185 q->pc_count += p->pc_count;
1186 q->count += p->count;
1187 *pp = p->next;
1188 break;
1189 }
1190 if (q == NULL)
1191 pp = &p->next;
1192 }
1193 *pp = edir->dyn_relocs;
1194 }
1195
1196 edir->dyn_relocs = eind->dyn_relocs;
1197 eind->dyn_relocs = NULL;
1198 }
1199
1200 if (ind->root.type == bfd_link_hash_indirect
1201 && dir->got.refcount <= 0)
1202 {
1203 edir->tls_type = eind->tls_type;
1204 eind->tls_type = GOT_UNKNOWN;
1205 }
1206
1207 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1208 generate a R_386_COPY reloc. */
1209 edir->gotoff_ref |= eind->gotoff_ref;
1210
1211 edir->has_got_reloc |= eind->has_got_reloc;
1212 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1213
1214 if (ELIMINATE_COPY_RELOCS
1215 && ind->root.type != bfd_link_hash_indirect
1216 && dir->dynamic_adjusted)
1217 {
1218 /* If called to transfer flags for a weakdef during processing
1219 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1220 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1221 if (dir->versioned != versioned_hidden)
1222 dir->ref_dynamic |= ind->ref_dynamic;
1223 dir->ref_regular |= ind->ref_regular;
1224 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1225 dir->needs_plt |= ind->needs_plt;
1226 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1227 }
1228 else
1229 {
1230 if (eind->func_pointer_refcount > 0)
1231 {
1232 edir->func_pointer_refcount += eind->func_pointer_refcount;
1233 eind->func_pointer_refcount = 0;
1234 }
1235
1236 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1237 }
1238 }
1239
1240 /* Return TRUE if the TLS access code sequence support transition
1241 from R_TYPE. */
1242
1243 static bfd_boolean
1244 elf_i386_check_tls_transition (asection *sec,
1245 bfd_byte *contents,
1246 Elf_Internal_Shdr *symtab_hdr,
1247 struct elf_link_hash_entry **sym_hashes,
1248 unsigned int r_type,
1249 const Elf_Internal_Rela *rel,
1250 const Elf_Internal_Rela *relend)
1251 {
1252 unsigned int val, type, reg;
1253 unsigned long r_symndx;
1254 struct elf_link_hash_entry *h;
1255 bfd_vma offset;
1256 bfd_byte *call;
1257 bfd_boolean indirect_call, tls_get_addr;
1258
1259 offset = rel->r_offset;
1260 switch (r_type)
1261 {
1262 case R_386_TLS_GD:
1263 case R_386_TLS_LDM:
1264 if (offset < 2 || (rel + 1) >= relend)
1265 return FALSE;
1266
1267 indirect_call = FALSE;
1268 call = contents + offset + 4;
1269 val = *(call - 5);
1270 type = *(call - 6);
1271 if (r_type == R_386_TLS_GD)
1272 {
1273 /* Check transition from GD access model. Only
1274 leal foo@tlsgd(,%ebx,1), %eax
1275 call ___tls_get_addr@PLT
1276 or
1277 leal foo@tlsgd(%ebx) %eax
1278 call ___tls_get_addr@PLT
1279 nop
1280 or
1281 leal foo@tlsgd(%reg), %eax
1282 call *___tls_get_addr@GOT(%reg)
1283 which may be converted to
1284 addr32 call ___tls_get_addr
1285 can transit to different access model. */
1286 if ((offset + 10) > sec->size
1287 || (type != 0x8d && type != 0x04))
1288 return FALSE;
1289
1290 if (type == 0x04)
1291 {
1292 /* leal foo@tlsgd(,%ebx,1), %eax
1293 call ___tls_get_addr@PLT */
1294 if (offset < 3)
1295 return FALSE;
1296
1297 if (*(call - 7) != 0x8d
1298 || val != 0x1d
1299 || call[0] != 0xe8)
1300 return FALSE;
1301 }
1302 else
1303 {
1304 /* This must be
1305 leal foo@tlsgd(%ebx), %eax
1306 call ___tls_get_addr@PLT
1307 nop
1308 or
1309 leal foo@tlsgd(%reg), %eax
1310 call *___tls_get_addr@GOT(%reg)
1311 which may be converted to
1312 addr32 call ___tls_get_addr
1313
1314 %eax can't be used as the GOT base register since it
1315 is used to pass parameter to ___tls_get_addr. */
1316 reg = val & 7;
1317 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1318 return FALSE;
1319
1320 indirect_call = call[0] == 0xff;
1321 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
1322 && !(call[0] == 0x67 && call[1] == 0xe8)
1323 && !(indirect_call
1324 && (call[1] & 0xf8) == 0x90
1325 && (call[1] & 0x7) == reg))
1326 return FALSE;
1327 }
1328 }
1329 else
1330 {
1331 /* Check transition from LD access model. Only
1332 leal foo@tlsldm(%ebx), %eax
1333 call ___tls_get_addr@PLT
1334 or
1335 leal foo@tlsldm(%reg), %eax
1336 call *___tls_get_addr@GOT(%reg)
1337 which may be converted to
1338 addr32 call ___tls_get_addr
1339 can transit to different access model. */
1340 if (type != 0x8d || (offset + 9) > sec->size)
1341 return FALSE;
1342
1343 /* %eax can't be used as the GOT base register since it is
1344 used to pass parameter to ___tls_get_addr. */
1345 reg = val & 7;
1346 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1347 return FALSE;
1348
1349 indirect_call = call[0] == 0xff;
1350 if (!(reg == 3 && call[0] == 0xe8)
1351 && !(call[0] == 0x67 && call[1] == 0xe8)
1352 && !(indirect_call
1353 && (call[1] & 0xf8) == 0x90
1354 && (call[1] & 0x7) == reg))
1355 return FALSE;
1356 }
1357
1358 r_symndx = ELF32_R_SYM (rel[1].r_info);
1359 if (r_symndx < symtab_hdr->sh_info)
1360 return FALSE;
1361
1362 tls_get_addr = FALSE;
1363 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1364 if (h != NULL && h->root.root.string != NULL)
1365 {
1366 struct elf_i386_link_hash_entry *eh
1367 = (struct elf_i386_link_hash_entry *) h;
1368 tls_get_addr = eh->tls_get_addr == 1;
1369 if (eh->tls_get_addr > 1)
1370 {
1371 /* Use strncmp to check ___tls_get_addr since
1372 ___tls_get_addr may be versioned. */
1373 if (strncmp (h->root.root.string, "___tls_get_addr", 15)
1374 == 0)
1375 {
1376 eh->tls_get_addr = 1;
1377 tls_get_addr = TRUE;
1378 }
1379 else
1380 eh->tls_get_addr = 0;
1381 }
1382 }
1383
1384 if (!tls_get_addr)
1385 return FALSE;
1386 else if (indirect_call)
1387 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
1388 else
1389 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1390 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
1391
1392 case R_386_TLS_IE:
1393 /* Check transition from IE access model:
1394 movl foo@indntpoff(%rip), %eax
1395 movl foo@indntpoff(%rip), %reg
1396 addl foo@indntpoff(%rip), %reg
1397 */
1398
1399 if (offset < 1 || (offset + 4) > sec->size)
1400 return FALSE;
1401
1402 /* Check "movl foo@tpoff(%rip), %eax" first. */
1403 val = bfd_get_8 (abfd, contents + offset - 1);
1404 if (val == 0xa1)
1405 return TRUE;
1406
1407 if (offset < 2)
1408 return FALSE;
1409
1410 /* Check movl|addl foo@tpoff(%rip), %reg. */
1411 type = bfd_get_8 (abfd, contents + offset - 2);
1412 return ((type == 0x8b || type == 0x03)
1413 && (val & 0xc7) == 0x05);
1414
1415 case R_386_TLS_GOTIE:
1416 case R_386_TLS_IE_32:
1417 /* Check transition from {IE_32,GOTIE} access model:
1418 subl foo@{tpoff,gontoff}(%reg1), %reg2
1419 movl foo@{tpoff,gontoff}(%reg1), %reg2
1420 addl foo@{tpoff,gontoff}(%reg1), %reg2
1421 */
1422
1423 if (offset < 2 || (offset + 4) > sec->size)
1424 return FALSE;
1425
1426 val = bfd_get_8 (abfd, contents + offset - 1);
1427 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1428 return FALSE;
1429
1430 type = bfd_get_8 (abfd, contents + offset - 2);
1431 return type == 0x8b || type == 0x2b || type == 0x03;
1432
1433 case R_386_TLS_GOTDESC:
1434 /* Check transition from GDesc access model:
1435 leal x@tlsdesc(%ebx), %eax
1436
1437 Make sure it's a leal adding ebx to a 32-bit offset
1438 into any register, although it's probably almost always
1439 going to be eax. */
1440
1441 if (offset < 2 || (offset + 4) > sec->size)
1442 return FALSE;
1443
1444 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1445 return FALSE;
1446
1447 val = bfd_get_8 (abfd, contents + offset - 1);
1448 return (val & 0xc7) == 0x83;
1449
1450 case R_386_TLS_DESC_CALL:
1451 /* Check transition from GDesc access model:
1452 call *x@tlsdesc(%eax)
1453 */
1454 if (offset + 2 <= sec->size)
1455 {
1456 /* Make sure that it's a call *x@tlsdesc(%eax). */
1457 call = contents + offset;
1458 return call[0] == 0xff && call[1] == 0x10;
1459 }
1460
1461 return FALSE;
1462
1463 default:
1464 abort ();
1465 }
1466 }
1467
1468 /* Return TRUE if the TLS access transition is OK or no transition
1469 will be performed. Update R_TYPE if there is a transition. */
1470
1471 static bfd_boolean
1472 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1473 asection *sec, bfd_byte *contents,
1474 Elf_Internal_Shdr *symtab_hdr,
1475 struct elf_link_hash_entry **sym_hashes,
1476 unsigned int *r_type, int tls_type,
1477 const Elf_Internal_Rela *rel,
1478 const Elf_Internal_Rela *relend,
1479 struct elf_link_hash_entry *h,
1480 unsigned long r_symndx,
1481 bfd_boolean from_relocate_section)
1482 {
1483 unsigned int from_type = *r_type;
1484 unsigned int to_type = from_type;
1485 bfd_boolean check = TRUE;
1486
1487 /* Skip TLS transition for functions. */
1488 if (h != NULL
1489 && (h->type == STT_FUNC
1490 || h->type == STT_GNU_IFUNC))
1491 return TRUE;
1492
1493 switch (from_type)
1494 {
1495 case R_386_TLS_GD:
1496 case R_386_TLS_GOTDESC:
1497 case R_386_TLS_DESC_CALL:
1498 case R_386_TLS_IE_32:
1499 case R_386_TLS_IE:
1500 case R_386_TLS_GOTIE:
1501 if (bfd_link_executable (info))
1502 {
1503 if (h == NULL)
1504 to_type = R_386_TLS_LE_32;
1505 else if (from_type != R_386_TLS_IE
1506 && from_type != R_386_TLS_GOTIE)
1507 to_type = R_386_TLS_IE_32;
1508 }
1509
1510 /* When we are called from elf_i386_relocate_section, there may
1511 be additional transitions based on TLS_TYPE. */
1512 if (from_relocate_section)
1513 {
1514 unsigned int new_to_type = to_type;
1515
1516 if (bfd_link_executable (info)
1517 && h != NULL
1518 && h->dynindx == -1
1519 && (tls_type & GOT_TLS_IE))
1520 new_to_type = R_386_TLS_LE_32;
1521
1522 if (to_type == R_386_TLS_GD
1523 || to_type == R_386_TLS_GOTDESC
1524 || to_type == R_386_TLS_DESC_CALL)
1525 {
1526 if (tls_type == GOT_TLS_IE_POS)
1527 new_to_type = R_386_TLS_GOTIE;
1528 else if (tls_type & GOT_TLS_IE)
1529 new_to_type = R_386_TLS_IE_32;
1530 }
1531
1532 /* We checked the transition before when we were called from
1533 elf_i386_check_relocs. We only want to check the new
1534 transition which hasn't been checked before. */
1535 check = new_to_type != to_type && from_type == to_type;
1536 to_type = new_to_type;
1537 }
1538
1539 break;
1540
1541 case R_386_TLS_LDM:
1542 if (bfd_link_executable (info))
1543 to_type = R_386_TLS_LE_32;
1544 break;
1545
1546 default:
1547 return TRUE;
1548 }
1549
1550 /* Return TRUE if there is no transition. */
1551 if (from_type == to_type)
1552 return TRUE;
1553
1554 /* Check if the transition can be performed. */
1555 if (check
1556 && ! elf_i386_check_tls_transition (sec, contents,
1557 symtab_hdr, sym_hashes,
1558 from_type, rel, relend))
1559 {
1560 reloc_howto_type *from, *to;
1561 const char *name;
1562
1563 from = elf_i386_rtype_to_howto (abfd, from_type);
1564 to = elf_i386_rtype_to_howto (abfd, to_type);
1565
1566 if (h)
1567 name = h->root.root.string;
1568 else
1569 {
1570 struct elf_i386_link_hash_table *htab;
1571
1572 htab = elf_i386_hash_table (info);
1573 if (htab == NULL)
1574 name = "*unknown*";
1575 else
1576 {
1577 Elf_Internal_Sym *isym;
1578
1579 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1580 abfd, r_symndx);
1581 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1582 }
1583 }
1584
1585 _bfd_error_handler
1586 /* xgettext:c-format */
1587 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1588 "in section `%A' failed"),
1589 abfd, from->name, to->name, name,
1590 (unsigned long) rel->r_offset, sec);
1591 bfd_set_error (bfd_error_bad_value);
1592 return FALSE;
1593 }
1594
1595 *r_type = to_type;
1596 return TRUE;
1597 }
1598
1599 /* With the local symbol, foo, we convert
1600 mov foo@GOT[(%reg1)], %reg2
1601 to
1602 lea foo[@GOTOFF(%reg1)], %reg2
1603 and convert
1604 call/jmp *foo@GOT[(%reg)]
1605 to
1606 nop call foo/jmp foo nop
1607 When PIC is false, convert
1608 test %reg1, foo@GOT[(%reg2)]
1609 to
1610 test $foo, %reg1
1611 and convert
1612 binop foo@GOT[(%reg1)], %reg2
1613 to
1614 binop $foo, %reg2
1615 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1616 instructions. */
1617
1618 static
1619 bfd_boolean
1620 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1621 bfd_byte *contents,
1622 Elf_Internal_Rela *irel,
1623 struct elf_link_hash_entry *h,
1624 bfd_boolean *converted,
1625 struct bfd_link_info *link_info)
1626 {
1627 struct elf_i386_link_hash_table *htab;
1628 unsigned int opcode;
1629 unsigned int modrm;
1630 bfd_boolean baseless;
1631 Elf_Internal_Sym *isym;
1632 unsigned int addend;
1633 unsigned int nop;
1634 bfd_vma nop_offset;
1635 bfd_boolean is_pic;
1636 bfd_boolean to_reloc_32;
1637 unsigned int r_type;
1638 unsigned int r_symndx;
1639 bfd_vma roff = irel->r_offset;
1640
1641 if (roff < 2)
1642 return TRUE;
1643
1644 /* Addend for R_386_GOT32X relocations must be 0. */
1645 addend = bfd_get_32 (abfd, contents + roff);
1646 if (addend != 0)
1647 return TRUE;
1648
1649 htab = elf_i386_hash_table (link_info);
1650 is_pic = bfd_link_pic (link_info);
1651
1652 r_type = ELF32_R_TYPE (irel->r_info);
1653 r_symndx = ELF32_R_SYM (irel->r_info);
1654
1655 modrm = bfd_get_8 (abfd, contents + roff - 1);
1656 baseless = (modrm & 0xc7) == 0x5;
1657
1658 if (baseless && is_pic)
1659 {
1660 /* For PIC, disallow R_386_GOT32X without a base register
1661 since we don't know what the GOT base is. */
1662 const char *name;
1663
1664 if (h == NULL)
1665 {
1666 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1667 r_symndx);
1668 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1669 }
1670 else
1671 name = h->root.root.string;
1672
1673 _bfd_error_handler
1674 /* xgettext:c-format */
1675 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1676 " register can not be used when making a shared object"),
1677 abfd, name);
1678 return FALSE;
1679 }
1680
1681 opcode = bfd_get_8 (abfd, contents + roff - 2);
1682
1683 /* Convert to R_386_32 if PIC is false or there is no base
1684 register. */
1685 to_reloc_32 = !is_pic || baseless;
1686
1687 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1688 reloc. */
1689 if (h == NULL)
1690 {
1691 if (opcode == 0x0ff)
1692 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1693 goto convert_branch;
1694 else
1695 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1696 "test %reg1, foo@GOT(%reg2)" and
1697 "binop foo@GOT[(%reg1)], %reg2". */
1698 goto convert_load;
1699 }
1700
1701 /* Undefined weak symbol is only bound locally in executable
1702 and its reference is resolved as 0. */
1703 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
1704 elf_i386_hash_entry (h)))
1705 {
1706 if (opcode == 0xff)
1707 {
1708 /* No direct branch to 0 for PIC. */
1709 if (is_pic)
1710 return TRUE;
1711 else
1712 goto convert_branch;
1713 }
1714 else
1715 {
1716 /* We can convert load of address 0 to R_386_32. */
1717 to_reloc_32 = TRUE;
1718 goto convert_load;
1719 }
1720 }
1721
1722 if (opcode == 0xff)
1723 {
1724 /* We have "call/jmp *foo@GOT[(%reg)]". */
1725 if ((h->root.type == bfd_link_hash_defined
1726 || h->root.type == bfd_link_hash_defweak)
1727 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1728 {
1729 /* The function is locally defined. */
1730 convert_branch:
1731 /* Convert R_386_GOT32X to R_386_PC32. */
1732 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1733 {
1734 struct elf_i386_link_hash_entry *eh
1735 = (struct elf_i386_link_hash_entry *) h;
1736
1737 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1738 is a nop prefix. */
1739 modrm = 0xe8;
1740 /* To support TLS optimization, always use addr32 prefix
1741 for "call *___tls_get_addr@GOT(%reg)". */
1742 if (eh && eh->tls_get_addr == 1)
1743 {
1744 nop = 0x67;
1745 nop_offset = irel->r_offset - 2;
1746 }
1747 else
1748 {
1749 nop = link_info->call_nop_byte;
1750 if (link_info->call_nop_as_suffix)
1751 {
1752 nop_offset = roff + 3;
1753 irel->r_offset -= 1;
1754 }
1755 else
1756 nop_offset = roff - 2;
1757 }
1758 }
1759 else
1760 {
1761 /* Convert to "jmp foo nop". */
1762 modrm = 0xe9;
1763 nop = NOP_OPCODE;
1764 nop_offset = roff + 3;
1765 irel->r_offset -= 1;
1766 }
1767
1768 bfd_put_8 (abfd, nop, contents + nop_offset);
1769 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1770 /* When converting to PC-relative relocation, we
1771 need to adjust addend by -4. */
1772 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1773 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1774
1775 *converted = TRUE;
1776 }
1777 }
1778 else
1779 {
1780 /* We have "mov foo@GOT[(%re1g)], %reg2",
1781 "test %reg1, foo@GOT(%reg2)" and
1782 "binop foo@GOT[(%reg1)], %reg2".
1783
1784 Avoid optimizing _DYNAMIC since ld.so may use its
1785 link-time address. */
1786 if (h == htab->elf.hdynamic)
1787 return TRUE;
1788
1789 /* def_regular is set by an assignment in a linker script in
1790 bfd_elf_record_link_assignment. */
1791 if ((h->def_regular
1792 || h->root.type == bfd_link_hash_defined
1793 || h->root.type == bfd_link_hash_defweak)
1794 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1795 {
1796 convert_load:
1797 if (opcode == 0x8b)
1798 {
1799 if (to_reloc_32)
1800 {
1801 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1802 "mov $foo, %reg2" with R_386_32. */
1803 r_type = R_386_32;
1804 modrm = 0xc0 | (modrm & 0x38) >> 3;
1805 bfd_put_8 (abfd, modrm, contents + roff - 1);
1806 opcode = 0xc7;
1807 }
1808 else
1809 {
1810 /* Convert "mov foo@GOT(%reg1), %reg2" to
1811 "lea foo@GOTOFF(%reg1), %reg2". */
1812 r_type = R_386_GOTOFF;
1813 opcode = 0x8d;
1814 }
1815 }
1816 else
1817 {
1818 /* Only R_386_32 is supported. */
1819 if (!to_reloc_32)
1820 return TRUE;
1821
1822 if (opcode == 0x85)
1823 {
1824 /* Convert "test %reg1, foo@GOT(%reg2)" to
1825 "test $foo, %reg1". */
1826 modrm = 0xc0 | (modrm & 0x38) >> 3;
1827 opcode = 0xf7;
1828 }
1829 else
1830 {
1831 /* Convert "binop foo@GOT(%reg1), %reg2" to
1832 "binop $foo, %reg2". */
1833 modrm = (0xc0
1834 | (modrm & 0x38) >> 3
1835 | (opcode & 0x3c));
1836 opcode = 0x81;
1837 }
1838 bfd_put_8 (abfd, modrm, contents + roff - 1);
1839 r_type = R_386_32;
1840 }
1841
1842 bfd_put_8 (abfd, opcode, contents + roff - 2);
1843 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1844
1845 *converted = TRUE;
1846 }
1847 }
1848
1849 return TRUE;
1850 }
1851
1852 /* Rename some of the generic section flags to better document how they
1853 are used here. */
1854 #define need_convert_load sec_flg0
1855 #define check_relocs_failed sec_flg1
1856
1857 /* Look through the relocs for a section during the first phase, and
1858 calculate needed space in the global offset table, procedure linkage
1859 table, and dynamic reloc sections. */
1860
1861 static bfd_boolean
1862 elf_i386_check_relocs (bfd *abfd,
1863 struct bfd_link_info *info,
1864 asection *sec,
1865 const Elf_Internal_Rela *relocs)
1866 {
1867 struct elf_i386_link_hash_table *htab;
1868 Elf_Internal_Shdr *symtab_hdr;
1869 struct elf_link_hash_entry **sym_hashes;
1870 const Elf_Internal_Rela *rel;
1871 const Elf_Internal_Rela *rel_end;
1872 asection *sreloc;
1873 bfd_byte *contents;
1874
1875 if (bfd_link_relocatable (info))
1876 return TRUE;
1877
1878 /* Don't do anything special with non-loaded, non-alloced sections.
1879 In particular, any relocs in such sections should not affect GOT
1880 and PLT reference counting (ie. we don't allow them to create GOT
1881 or PLT entries), there's no possibility or desire to optimize TLS
1882 relocs, and there's not much point in propagating relocs to shared
1883 libs that the dynamic linker won't relocate. */
1884 if ((sec->flags & SEC_ALLOC) == 0)
1885 return TRUE;
1886
1887 BFD_ASSERT (is_i386_elf (abfd));
1888
1889 htab = elf_i386_hash_table (info);
1890 if (htab == NULL)
1891 {
1892 sec->check_relocs_failed = 1;
1893 return FALSE;
1894 }
1895
1896 /* Get the section contents. */
1897 if (elf_section_data (sec)->this_hdr.contents != NULL)
1898 contents = elf_section_data (sec)->this_hdr.contents;
1899 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1900 {
1901 sec->check_relocs_failed = 1;
1902 return FALSE;
1903 }
1904
1905 symtab_hdr = &elf_symtab_hdr (abfd);
1906 sym_hashes = elf_sym_hashes (abfd);
1907
1908 sreloc = NULL;
1909
1910 rel_end = relocs + sec->reloc_count;
1911 for (rel = relocs; rel < rel_end; rel++)
1912 {
1913 unsigned int r_type;
1914 unsigned long r_symndx;
1915 struct elf_link_hash_entry *h;
1916 struct elf_i386_link_hash_entry *eh;
1917 Elf_Internal_Sym *isym;
1918 const char *name;
1919 bfd_boolean size_reloc;
1920
1921 r_symndx = ELF32_R_SYM (rel->r_info);
1922 r_type = ELF32_R_TYPE (rel->r_info);
1923
1924 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1925 {
1926 /* xgettext:c-format */
1927 _bfd_error_handler (_("%B: bad symbol index: %d"),
1928 abfd, r_symndx);
1929 goto error_return;
1930 }
1931
1932 if (r_symndx < symtab_hdr->sh_info)
1933 {
1934 /* A local symbol. */
1935 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1936 abfd, r_symndx);
1937 if (isym == NULL)
1938 goto error_return;
1939
1940 /* Check relocation against local STT_GNU_IFUNC symbol. */
1941 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1942 {
1943 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1944 if (h == NULL)
1945 goto error_return;
1946
1947 /* Fake a STT_GNU_IFUNC symbol. */
1948 h->type = STT_GNU_IFUNC;
1949 h->def_regular = 1;
1950 h->ref_regular = 1;
1951 h->forced_local = 1;
1952 h->root.type = bfd_link_hash_defined;
1953 }
1954 else
1955 h = NULL;
1956 }
1957 else
1958 {
1959 isym = NULL;
1960 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1961 while (h->root.type == bfd_link_hash_indirect
1962 || h->root.type == bfd_link_hash_warning)
1963 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1964 }
1965
1966 eh = (struct elf_i386_link_hash_entry *) h;
1967 if (h != NULL)
1968 {
1969 if (r_type == R_386_GOTOFF)
1970 eh->gotoff_ref = 1;
1971
1972 /* It is referenced by a non-shared object. */
1973 h->ref_regular = 1;
1974 h->root.non_ir_ref = 1;
1975
1976 if (h->type == STT_GNU_IFUNC)
1977 elf_tdata (info->output_bfd)->has_gnu_symbols
1978 |= elf_gnu_symbol_ifunc;
1979 }
1980
1981 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1982 symtab_hdr, sym_hashes,
1983 &r_type, GOT_UNKNOWN,
1984 rel, rel_end, h, r_symndx, FALSE))
1985 goto error_return;
1986
1987 switch (r_type)
1988 {
1989 case R_386_TLS_LDM:
1990 htab->tls_ldm_got.refcount += 1;
1991 goto create_got;
1992
1993 case R_386_PLT32:
1994 /* This symbol requires a procedure linkage table entry. We
1995 actually build the entry in adjust_dynamic_symbol,
1996 because this might be a case of linking PIC code which is
1997 never referenced by a dynamic object, in which case we
1998 don't need to generate a procedure linkage table entry
1999 after all. */
2000
2001 /* If this is a local symbol, we resolve it directly without
2002 creating a procedure linkage table entry. */
2003 if (h == NULL)
2004 continue;
2005
2006 eh->has_got_reloc = 1;
2007 h->needs_plt = 1;
2008 h->plt.refcount += 1;
2009 break;
2010
2011 case R_386_SIZE32:
2012 size_reloc = TRUE;
2013 goto do_size;
2014
2015 case R_386_TLS_IE_32:
2016 case R_386_TLS_IE:
2017 case R_386_TLS_GOTIE:
2018 if (!bfd_link_executable (info))
2019 info->flags |= DF_STATIC_TLS;
2020 /* Fall through */
2021
2022 case R_386_GOT32:
2023 case R_386_GOT32X:
2024 case R_386_TLS_GD:
2025 case R_386_TLS_GOTDESC:
2026 case R_386_TLS_DESC_CALL:
2027 /* This symbol requires a global offset table entry. */
2028 {
2029 int tls_type, old_tls_type;
2030
2031 switch (r_type)
2032 {
2033 default:
2034 case R_386_GOT32:
2035 case R_386_GOT32X:
2036 tls_type = GOT_NORMAL;
2037 break;
2038 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
2039 case R_386_TLS_GOTDESC:
2040 case R_386_TLS_DESC_CALL:
2041 tls_type = GOT_TLS_GDESC; break;
2042 case R_386_TLS_IE_32:
2043 if (ELF32_R_TYPE (rel->r_info) == r_type)
2044 tls_type = GOT_TLS_IE_NEG;
2045 else
2046 /* If this is a GD->IE transition, we may use either of
2047 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2048 tls_type = GOT_TLS_IE;
2049 break;
2050 case R_386_TLS_IE:
2051 case R_386_TLS_GOTIE:
2052 tls_type = GOT_TLS_IE_POS; break;
2053 }
2054
2055 if (h != NULL)
2056 {
2057 h->got.refcount += 1;
2058 old_tls_type = elf_i386_hash_entry(h)->tls_type;
2059 }
2060 else
2061 {
2062 bfd_signed_vma *local_got_refcounts;
2063
2064 /* This is a global offset table entry for a local symbol. */
2065 local_got_refcounts = elf_local_got_refcounts (abfd);
2066 if (local_got_refcounts == NULL)
2067 {
2068 bfd_size_type size;
2069
2070 size = symtab_hdr->sh_info;
2071 size *= (sizeof (bfd_signed_vma)
2072 + sizeof (bfd_vma) + sizeof(char));
2073 local_got_refcounts = (bfd_signed_vma *)
2074 bfd_zalloc (abfd, size);
2075 if (local_got_refcounts == NULL)
2076 goto error_return;
2077 elf_local_got_refcounts (abfd) = local_got_refcounts;
2078 elf_i386_local_tlsdesc_gotent (abfd)
2079 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2080 elf_i386_local_got_tls_type (abfd)
2081 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2082 }
2083 local_got_refcounts[r_symndx] += 1;
2084 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
2085 }
2086
2087 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
2088 tls_type |= old_tls_type;
2089 /* If a TLS symbol is accessed using IE at least once,
2090 there is no point to use dynamic model for it. */
2091 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2092 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2093 || (tls_type & GOT_TLS_IE) == 0))
2094 {
2095 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
2096 tls_type = old_tls_type;
2097 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2098 && GOT_TLS_GD_ANY_P (tls_type))
2099 tls_type |= old_tls_type;
2100 else
2101 {
2102 if (h)
2103 name = h->root.root.string;
2104 else
2105 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2106 NULL);
2107 _bfd_error_handler
2108 /* xgettext:c-format */
2109 (_("%B: `%s' accessed both as normal and "
2110 "thread local symbol"),
2111 abfd, name);
2112 bfd_set_error (bfd_error_bad_value);
2113 goto error_return;
2114 }
2115 }
2116
2117 if (old_tls_type != tls_type)
2118 {
2119 if (h != NULL)
2120 elf_i386_hash_entry (h)->tls_type = tls_type;
2121 else
2122 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
2123 }
2124 }
2125 /* Fall through */
2126
2127 case R_386_GOTOFF:
2128 case R_386_GOTPC:
2129 create_got:
2130 if (r_type != R_386_TLS_IE)
2131 {
2132 if (eh != NULL)
2133 eh->has_got_reloc = 1;
2134 break;
2135 }
2136 /* Fall through */
2137
2138 case R_386_TLS_LE_32:
2139 case R_386_TLS_LE:
2140 if (eh != NULL)
2141 eh->has_got_reloc = 1;
2142 if (bfd_link_executable (info))
2143 break;
2144 info->flags |= DF_STATIC_TLS;
2145 goto do_relocation;
2146
2147 case R_386_32:
2148 case R_386_PC32:
2149 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2150 eh->has_non_got_reloc = 1;
2151 do_relocation:
2152 /* We are called after all symbols have been resolved. Only
2153 relocation against STT_GNU_IFUNC symbol must go through
2154 PLT. */
2155 if (h != NULL
2156 && (bfd_link_executable (info)
2157 || h->type == STT_GNU_IFUNC))
2158 {
2159 /* If this reloc is in a read-only section, we might
2160 need a copy reloc. We can't check reliably at this
2161 stage whether the section is read-only, as input
2162 sections have not yet been mapped to output sections.
2163 Tentatively set the flag for now, and correct in
2164 adjust_dynamic_symbol. */
2165 h->non_got_ref = 1;
2166
2167 /* We may need a .plt entry if the symbol is a function
2168 defined in a shared lib or is a STT_GNU_IFUNC function
2169 referenced from the code or read-only section. */
2170 if (!h->def_regular
2171 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2172 h->plt.refcount += 1;
2173
2174 if (r_type == R_386_PC32)
2175 {
2176 /* Since something like ".long foo - ." may be used
2177 as pointer, make sure that PLT is used if foo is
2178 a function defined in a shared library. */
2179 if ((sec->flags & SEC_CODE) == 0)
2180 h->pointer_equality_needed = 1;
2181 else if (h->type == STT_GNU_IFUNC
2182 && bfd_link_pic (info))
2183 {
2184 if (isym == NULL)
2185 name = h->root.root.string;
2186 else
2187 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2188 NULL);
2189 _bfd_error_handler
2190 /* xgettext:c-format */
2191 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
2192 abfd, name);
2193 bfd_set_error (bfd_error_bad_value);
2194 goto error_return;
2195 }
2196 }
2197 else
2198 {
2199 h->pointer_equality_needed = 1;
2200 /* R_386_32 can be resolved at run-time. */
2201 if (r_type == R_386_32
2202 && (sec->flags & SEC_READONLY) == 0)
2203 eh->func_pointer_refcount += 1;
2204 }
2205 }
2206
2207 size_reloc = FALSE;
2208 do_size:
2209 /* If we are creating a shared library, and this is a reloc
2210 against a global symbol, or a non PC relative reloc
2211 against a local symbol, then we need to copy the reloc
2212 into the shared library. However, if we are linking with
2213 -Bsymbolic, we do not need to copy a reloc against a
2214 global symbol which is defined in an object we are
2215 including in the link (i.e., DEF_REGULAR is set). At
2216 this point we have not seen all the input files, so it is
2217 possible that DEF_REGULAR is not set now but will be set
2218 later (it is never cleared). In case of a weak definition,
2219 DEF_REGULAR may be cleared later by a strong definition in
2220 a shared library. We account for that possibility below by
2221 storing information in the relocs_copied field of the hash
2222 table entry. A similar situation occurs when creating
2223 shared libraries and symbol visibility changes render the
2224 symbol local.
2225
2226 If on the other hand, we are creating an executable, we
2227 may need to keep relocations for symbols satisfied by a
2228 dynamic library if we manage to avoid copy relocs for the
2229 symbol.
2230
2231 Generate dynamic pointer relocation against STT_GNU_IFUNC
2232 symbol in the non-code section. */
2233 if ((bfd_link_pic (info)
2234 && (r_type != R_386_PC32
2235 || (h != NULL
2236 && (! (bfd_link_pie (info)
2237 || SYMBOLIC_BIND (info, h))
2238 || h->root.type == bfd_link_hash_defweak
2239 || !h->def_regular))))
2240 || (h != NULL
2241 && h->type == STT_GNU_IFUNC
2242 && r_type == R_386_32
2243 && (sec->flags & SEC_CODE) == 0)
2244 || (ELIMINATE_COPY_RELOCS
2245 && !bfd_link_pic (info)
2246 && h != NULL
2247 && (h->root.type == bfd_link_hash_defweak
2248 || !h->def_regular)))
2249 {
2250 struct elf_dyn_relocs *p;
2251 struct elf_dyn_relocs **head;
2252
2253 /* We must copy these reloc types into the output file.
2254 Create a reloc section in dynobj and make room for
2255 this reloc. */
2256 if (sreloc == NULL)
2257 {
2258 sreloc = _bfd_elf_make_dynamic_reloc_section
2259 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
2260
2261 if (sreloc == NULL)
2262 goto error_return;
2263 }
2264
2265 /* If this is a global symbol, we count the number of
2266 relocations we need for this symbol. */
2267 if (h != NULL)
2268 {
2269 head = &eh->dyn_relocs;
2270 }
2271 else
2272 {
2273 /* Track dynamic relocs needed for local syms too.
2274 We really need local syms available to do this
2275 easily. Oh well. */
2276 void **vpp;
2277 asection *s;
2278
2279 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2280 abfd, r_symndx);
2281 if (isym == NULL)
2282 goto error_return;
2283
2284 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2285 if (s == NULL)
2286 s = sec;
2287
2288 vpp = &elf_section_data (s)->local_dynrel;
2289 head = (struct elf_dyn_relocs **)vpp;
2290 }
2291
2292 p = *head;
2293 if (p == NULL || p->sec != sec)
2294 {
2295 bfd_size_type amt = sizeof *p;
2296 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
2297 amt);
2298 if (p == NULL)
2299 goto error_return;
2300 p->next = *head;
2301 *head = p;
2302 p->sec = sec;
2303 p->count = 0;
2304 p->pc_count = 0;
2305 }
2306
2307 p->count += 1;
2308 /* Count size relocation as PC-relative relocation. */
2309 if (r_type == R_386_PC32 || size_reloc)
2310 p->pc_count += 1;
2311 }
2312 break;
2313
2314 /* This relocation describes the C++ object vtable hierarchy.
2315 Reconstruct it for later use during GC. */
2316 case R_386_GNU_VTINHERIT:
2317 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2318 goto error_return;
2319 break;
2320
2321 /* This relocation describes which C++ vtable entries are actually
2322 used. Record for later use during GC. */
2323 case R_386_GNU_VTENTRY:
2324 BFD_ASSERT (h != NULL);
2325 if (h != NULL
2326 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
2327 goto error_return;
2328 break;
2329
2330 default:
2331 break;
2332 }
2333
2334 if (r_type == R_386_GOT32X
2335 && (h == NULL || h->type != STT_GNU_IFUNC))
2336 sec->need_convert_load = 1;
2337 }
2338
2339 if (elf_section_data (sec)->this_hdr.contents != contents)
2340 {
2341 if (!info->keep_memory)
2342 free (contents);
2343 else
2344 {
2345 /* Cache the section contents for elf_link_input_bfd. */
2346 elf_section_data (sec)->this_hdr.contents = contents;
2347 }
2348 }
2349
2350 return TRUE;
2351
2352 error_return:
2353 if (elf_section_data (sec)->this_hdr.contents != contents)
2354 free (contents);
2355 sec->check_relocs_failed = 1;
2356 return FALSE;
2357 }
2358
2359 /* Return the section that should be marked against GC for a given
2360 relocation. */
2361
2362 static asection *
2363 elf_i386_gc_mark_hook (asection *sec,
2364 struct bfd_link_info *info,
2365 Elf_Internal_Rela *rel,
2366 struct elf_link_hash_entry *h,
2367 Elf_Internal_Sym *sym)
2368 {
2369 if (h != NULL)
2370 switch (ELF32_R_TYPE (rel->r_info))
2371 {
2372 case R_386_GNU_VTINHERIT:
2373 case R_386_GNU_VTENTRY:
2374 return NULL;
2375 }
2376
2377 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2378 }
2379
2380 /* Remove undefined weak symbol from the dynamic symbol table if it
2381 is resolved to 0. */
2382
2383 static bfd_boolean
2384 elf_i386_fixup_symbol (struct bfd_link_info *info,
2385 struct elf_link_hash_entry *h)
2386 {
2387 if (h->dynindx != -1
2388 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2389 elf_i386_hash_entry (h)->has_got_reloc,
2390 elf_i386_hash_entry (h)))
2391 {
2392 h->dynindx = -1;
2393 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2394 h->dynstr_index);
2395 }
2396 return TRUE;
2397 }
2398
2399 /* Adjust a symbol defined by a dynamic object and referenced by a
2400 regular object. The current definition is in some section of the
2401 dynamic object, but we're not including those sections. We have to
2402 change the definition to something the rest of the link can
2403 understand. */
2404
2405 static bfd_boolean
2406 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2407 struct elf_link_hash_entry *h)
2408 {
2409 struct elf_i386_link_hash_table *htab;
2410 asection *s, *srel;
2411 struct elf_i386_link_hash_entry *eh;
2412 struct elf_dyn_relocs *p;
2413
2414 /* STT_GNU_IFUNC symbol must go through PLT. */
2415 if (h->type == STT_GNU_IFUNC)
2416 {
2417 /* All local STT_GNU_IFUNC references must be treate as local
2418 calls via local PLT. */
2419 if (h->ref_regular
2420 && SYMBOL_CALLS_LOCAL (info, h))
2421 {
2422 bfd_size_type pc_count = 0, count = 0;
2423 struct elf_dyn_relocs **pp;
2424
2425 eh = (struct elf_i386_link_hash_entry *) h;
2426 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2427 {
2428 pc_count += p->pc_count;
2429 p->count -= p->pc_count;
2430 p->pc_count = 0;
2431 count += p->count;
2432 if (p->count == 0)
2433 *pp = p->next;
2434 else
2435 pp = &p->next;
2436 }
2437
2438 if (pc_count || count)
2439 {
2440 h->non_got_ref = 1;
2441 if (pc_count)
2442 {
2443 /* Increment PLT reference count only for PC-relative
2444 references. */
2445 h->needs_plt = 1;
2446 if (h->plt.refcount <= 0)
2447 h->plt.refcount = 1;
2448 else
2449 h->plt.refcount += 1;
2450 }
2451 }
2452 }
2453
2454 if (h->plt.refcount <= 0)
2455 {
2456 h->plt.offset = (bfd_vma) -1;
2457 h->needs_plt = 0;
2458 }
2459 return TRUE;
2460 }
2461
2462 /* If this is a function, put it in the procedure linkage table. We
2463 will fill in the contents of the procedure linkage table later,
2464 when we know the address of the .got section. */
2465 if (h->type == STT_FUNC
2466 || h->needs_plt)
2467 {
2468 if (h->plt.refcount <= 0
2469 || SYMBOL_CALLS_LOCAL (info, h)
2470 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2471 && h->root.type == bfd_link_hash_undefweak))
2472 {
2473 /* This case can occur if we saw a PLT32 reloc in an input
2474 file, but the symbol was never referred to by a dynamic
2475 object, or if all references were garbage collected. In
2476 such a case, we don't actually need to build a procedure
2477 linkage table, and we can just do a PC32 reloc instead. */
2478 h->plt.offset = (bfd_vma) -1;
2479 h->needs_plt = 0;
2480 }
2481
2482 return TRUE;
2483 }
2484 else
2485 /* It's possible that we incorrectly decided a .plt reloc was
2486 needed for an R_386_PC32 reloc to a non-function sym in
2487 check_relocs. We can't decide accurately between function and
2488 non-function syms in check-relocs; Objects loaded later in
2489 the link may change h->type. So fix it now. */
2490 h->plt.offset = (bfd_vma) -1;
2491
2492 /* If this is a weak symbol, and there is a real definition, the
2493 processor independent code will have arranged for us to see the
2494 real definition first, and we can just use the same value. */
2495 if (h->u.weakdef != NULL)
2496 {
2497 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2498 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2499 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2500 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2501 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2502 h->non_got_ref = h->u.weakdef->non_got_ref;
2503 return TRUE;
2504 }
2505
2506 /* This is a reference to a symbol defined by a dynamic object which
2507 is not a function. */
2508
2509 /* If we are creating a shared library, we must presume that the
2510 only references to the symbol are via the global offset table.
2511 For such cases we need not do anything here; the relocations will
2512 be handled correctly by relocate_section. */
2513 if (!bfd_link_executable (info))
2514 return TRUE;
2515
2516 /* If there are no references to this symbol that do not use the
2517 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2518 reloc. */
2519 eh = (struct elf_i386_link_hash_entry *) h;
2520 if (!h->non_got_ref && !eh->gotoff_ref)
2521 return TRUE;
2522
2523 /* If -z nocopyreloc was given, we won't generate them either. */
2524 if (info->nocopyreloc)
2525 {
2526 h->non_got_ref = 0;
2527 return TRUE;
2528 }
2529
2530 htab = elf_i386_hash_table (info);
2531 if (htab == NULL)
2532 return FALSE;
2533
2534 /* If there aren't any dynamic relocs in read-only sections nor
2535 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2536 avoid the copy reloc. This doesn't work on VxWorks, where we can
2537 not have dynamic relocations (other than copy and jump slot
2538 relocations) in an executable. */
2539 if (ELIMINATE_COPY_RELOCS
2540 && !eh->gotoff_ref
2541 && get_elf_i386_backend_data (info->output_bfd)->os != is_vxworks)
2542 {
2543 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2544 {
2545 s = p->sec->output_section;
2546 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2547 break;
2548 }
2549
2550 if (p == NULL)
2551 {
2552 h->non_got_ref = 0;
2553 return TRUE;
2554 }
2555 }
2556
2557 /* We must allocate the symbol in our .dynbss section, which will
2558 become part of the .bss section of the executable. There will be
2559 an entry for this symbol in the .dynsym section. The dynamic
2560 object will contain position independent code, so all references
2561 from the dynamic object to this symbol will go through the global
2562 offset table. The dynamic linker will use the .dynsym entry to
2563 determine the address it must put in the global offset table, so
2564 both the dynamic object and the regular object will refer to the
2565 same memory location for the variable. */
2566
2567 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2568 copy the initial value out of the dynamic object and into the
2569 runtime process image. */
2570 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
2571 {
2572 s = htab->elf.sdynrelro;
2573 srel = htab->elf.sreldynrelro;
2574 }
2575 else
2576 {
2577 s = htab->elf.sdynbss;
2578 srel = htab->elf.srelbss;
2579 }
2580 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2581 {
2582 srel->size += sizeof (Elf32_External_Rel);
2583 h->needs_copy = 1;
2584 }
2585
2586 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2587 }
2588
2589 /* Allocate space in .plt, .got and associated reloc sections for
2590 dynamic relocs. */
2591
2592 static bfd_boolean
2593 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2594 {
2595 struct bfd_link_info *info;
2596 struct elf_i386_link_hash_table *htab;
2597 struct elf_i386_link_hash_entry *eh;
2598 struct elf_dyn_relocs *p;
2599 unsigned plt_entry_size;
2600 bfd_boolean resolved_to_zero;
2601 const struct elf_i386_backend_data *bed;
2602
2603 if (h->root.type == bfd_link_hash_indirect)
2604 return TRUE;
2605
2606 eh = (struct elf_i386_link_hash_entry *) h;
2607
2608 info = (struct bfd_link_info *) inf;
2609 htab = elf_i386_hash_table (info);
2610 if (htab == NULL)
2611 return FALSE;
2612
2613 bed = get_elf_i386_backend_data (info->output_bfd);
2614
2615 plt_entry_size = htab->plt.plt_entry_size;
2616
2617 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2618 eh->has_got_reloc,
2619 eh);
2620
2621 /* Clear the reference count of function pointer relocations if
2622 symbol isn't a normal function. */
2623 if (h->type != STT_FUNC)
2624 eh->func_pointer_refcount = 0;
2625
2626 /* We can't use the GOT PLT if pointer equality is needed since
2627 finish_dynamic_symbol won't clear symbol value and the dynamic
2628 linker won't update the GOT slot. We will get into an infinite
2629 loop at run-time. */
2630 if (htab->plt_got != NULL
2631 && h->type != STT_GNU_IFUNC
2632 && !h->pointer_equality_needed
2633 && h->plt.refcount > 0
2634 && h->got.refcount > 0)
2635 {
2636 /* Don't use the regular PLT if there are both GOT and GOTPLT
2637 reloctions. */
2638 h->plt.offset = (bfd_vma) -1;
2639
2640 /* Use the GOT PLT. */
2641 eh->plt_got.refcount = 1;
2642 }
2643
2644 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2645 here if it is defined and referenced in a non-shared object. */
2646 if (h->type == STT_GNU_IFUNC
2647 && h->def_regular)
2648 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2649 &htab->readonly_dynrelocs_against_ifunc,
2650 plt_entry_size,
2651 (htab->plt.has_plt0 *
2652 plt_entry_size),
2653 4, TRUE);
2654 /* Don't create the PLT entry if there are only function pointer
2655 relocations which can be resolved at run-time. */
2656 else if (htab->elf.dynamic_sections_created
2657 && (h->plt.refcount > eh->func_pointer_refcount
2658 || eh->plt_got.refcount > 0))
2659 {
2660 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2661
2662 /* Clear the reference count of function pointer relocations
2663 if PLT is used. */
2664 eh->func_pointer_refcount = 0;
2665
2666 /* Make sure this symbol is output as a dynamic symbol.
2667 Undefined weak syms won't yet be marked as dynamic. */
2668 if (h->dynindx == -1
2669 && !h->forced_local
2670 && !resolved_to_zero
2671 && h->root.type == bfd_link_hash_undefweak)
2672 {
2673 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2674 return FALSE;
2675 }
2676
2677 if (bfd_link_pic (info)
2678 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2679 {
2680 asection *s = htab->elf.splt;
2681 asection *got_s = htab->plt_got;
2682
2683 /* If this is the first .plt entry, make room for the special
2684 first entry. The .plt section is used by prelink to undo
2685 prelinking for dynamic relocations. */
2686 if (s->size == 0)
2687 s->size = htab->plt.has_plt0 * plt_entry_size;
2688
2689 if (use_plt_got)
2690 eh->plt_got.offset = got_s->size;
2691 else
2692 h->plt.offset = s->size;
2693
2694 /* If this symbol is not defined in a regular file, and we are
2695 not generating a shared library, then set the symbol to this
2696 location in the .plt. This is required to make function
2697 pointers compare as equal between the normal executable and
2698 the shared library. */
2699 if (! bfd_link_pic (info)
2700 && !h->def_regular)
2701 {
2702 if (use_plt_got)
2703 {
2704 /* We need to make a call to the entry of the GOT PLT
2705 instead of regular PLT entry. */
2706 h->root.u.def.section = got_s;
2707 h->root.u.def.value = eh->plt_got.offset;
2708 }
2709 else
2710 {
2711 h->root.u.def.section = s;
2712 h->root.u.def.value = h->plt.offset;
2713 }
2714 }
2715
2716 /* Make room for this entry. */
2717 if (use_plt_got)
2718 got_s->size += htab->non_lazy_plt->plt_entry_size;
2719 else
2720 {
2721 s->size += plt_entry_size;
2722
2723 /* We also need to make an entry in the .got.plt section,
2724 which will be placed in the .got section by the linker
2725 script. */
2726 htab->elf.sgotplt->size += 4;
2727
2728 /* There should be no PLT relocation against resolved
2729 undefined weak symbol in executable. */
2730 if (!resolved_to_zero)
2731 {
2732 /* We also need to make an entry in the .rel.plt
2733 section. */
2734 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2735 htab->elf.srelplt->reloc_count++;
2736 }
2737 }
2738
2739 if (bed->os == is_vxworks && !bfd_link_pic (info))
2740 {
2741 /* VxWorks has a second set of relocations for each PLT entry
2742 in executables. They go in a separate relocation section,
2743 which is processed by the kernel loader. */
2744
2745 /* There are two relocations for the initial PLT entry: an
2746 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2747 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2748
2749 if (h->plt.offset == plt_entry_size)
2750 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2751
2752 /* There are two extra relocations for each subsequent PLT entry:
2753 an R_386_32 relocation for the GOT entry, and an R_386_32
2754 relocation for the PLT entry. */
2755
2756 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2757 }
2758 }
2759 else
2760 {
2761 eh->plt_got.offset = (bfd_vma) -1;
2762 h->plt.offset = (bfd_vma) -1;
2763 h->needs_plt = 0;
2764 }
2765 }
2766 else
2767 {
2768 eh->plt_got.offset = (bfd_vma) -1;
2769 h->plt.offset = (bfd_vma) -1;
2770 h->needs_plt = 0;
2771 }
2772
2773 eh->tlsdesc_got = (bfd_vma) -1;
2774
2775 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2776 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2777 if (h->got.refcount > 0
2778 && bfd_link_executable (info)
2779 && h->dynindx == -1
2780 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2781 h->got.offset = (bfd_vma) -1;
2782 else if (h->got.refcount > 0)
2783 {
2784 asection *s;
2785 bfd_boolean dyn;
2786 int tls_type = elf_i386_hash_entry(h)->tls_type;
2787
2788 /* Make sure this symbol is output as a dynamic symbol.
2789 Undefined weak syms won't yet be marked as dynamic. */
2790 if (h->dynindx == -1
2791 && !h->forced_local
2792 && !resolved_to_zero
2793 && h->root.type == bfd_link_hash_undefweak)
2794 {
2795 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2796 return FALSE;
2797 }
2798
2799 s = htab->elf.sgot;
2800 if (GOT_TLS_GDESC_P (tls_type))
2801 {
2802 eh->tlsdesc_got = htab->elf.sgotplt->size
2803 - elf_i386_compute_jump_table_size (htab);
2804 htab->elf.sgotplt->size += 8;
2805 h->got.offset = (bfd_vma) -2;
2806 }
2807 if (! GOT_TLS_GDESC_P (tls_type)
2808 || GOT_TLS_GD_P (tls_type))
2809 {
2810 h->got.offset = s->size;
2811 s->size += 4;
2812 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2813 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2814 s->size += 4;
2815 }
2816 dyn = htab->elf.dynamic_sections_created;
2817 /* R_386_TLS_IE_32 needs one dynamic relocation,
2818 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2819 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2820 need two), R_386_TLS_GD needs one if local symbol and two if
2821 global. No dynamic relocation against resolved undefined weak
2822 symbol in executable. */
2823 if (tls_type == GOT_TLS_IE_BOTH)
2824 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2825 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2826 || (tls_type & GOT_TLS_IE))
2827 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2828 else if (GOT_TLS_GD_P (tls_type))
2829 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2830 else if (! GOT_TLS_GDESC_P (tls_type)
2831 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2832 && !resolved_to_zero)
2833 || h->root.type != bfd_link_hash_undefweak)
2834 && (bfd_link_pic (info)
2835 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2836 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2837 if (GOT_TLS_GDESC_P (tls_type))
2838 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2839 }
2840 else
2841 h->got.offset = (bfd_vma) -1;
2842
2843 if (eh->dyn_relocs == NULL)
2844 return TRUE;
2845
2846 /* In the shared -Bsymbolic case, discard space allocated for
2847 dynamic pc-relative relocs against symbols which turn out to be
2848 defined in regular objects. For the normal shared case, discard
2849 space for pc-relative relocs that have become local due to symbol
2850 visibility changes. */
2851
2852 if (bfd_link_pic (info))
2853 {
2854 /* The only reloc that uses pc_count is R_386_PC32, which will
2855 appear on a call or on something like ".long foo - .". We
2856 want calls to protected symbols to resolve directly to the
2857 function rather than going via the plt. If people want
2858 function pointer comparisons to work as expected then they
2859 should avoid writing assembly like ".long foo - .". */
2860 if (SYMBOL_CALLS_LOCAL (info, h))
2861 {
2862 struct elf_dyn_relocs **pp;
2863
2864 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2865 {
2866 p->count -= p->pc_count;
2867 p->pc_count = 0;
2868 if (p->count == 0)
2869 *pp = p->next;
2870 else
2871 pp = &p->next;
2872 }
2873 }
2874
2875 if (bed->os == is_vxworks)
2876 {
2877 struct elf_dyn_relocs **pp;
2878 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2879 {
2880 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2881 *pp = p->next;
2882 else
2883 pp = &p->next;
2884 }
2885 }
2886
2887 /* Also discard relocs on undefined weak syms with non-default
2888 visibility or in PIE. */
2889 if (eh->dyn_relocs != NULL
2890 && h->root.type == bfd_link_hash_undefweak)
2891 {
2892 /* Undefined weak symbol is never bound locally in shared
2893 library. */
2894 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2895 || resolved_to_zero)
2896 {
2897 if (h->non_got_ref)
2898 {
2899 /* Keep dynamic non-GOT/non-PLT relocation so that we
2900 can branch to 0 without PLT. */
2901 struct elf_dyn_relocs **pp;
2902
2903 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2904 if (p->pc_count == 0)
2905 *pp = p->next;
2906 else
2907 {
2908 /* Remove non-R_386_PC32 relocation. */
2909 p->count = p->pc_count;
2910 pp = &p->next;
2911 }
2912
2913 if (eh->dyn_relocs != NULL)
2914 {
2915 /* Make sure undefined weak symbols are output
2916 as dynamic symbols in PIEs for dynamic non-GOT
2917 non-PLT reloations. */
2918 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2919 return FALSE;
2920 }
2921 }
2922 else
2923 eh->dyn_relocs = NULL;
2924 }
2925 else if (h->dynindx == -1
2926 && !h->forced_local)
2927 {
2928 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2929 return FALSE;
2930 }
2931 }
2932 }
2933 else if (ELIMINATE_COPY_RELOCS)
2934 {
2935 /* For the non-shared case, discard space for relocs against
2936 symbols which turn out to need copy relocs or are not
2937 dynamic. Keep dynamic relocations for run-time function
2938 pointer initialization. */
2939
2940 if ((!h->non_got_ref
2941 || eh->func_pointer_refcount > 0
2942 || (h->root.type == bfd_link_hash_undefweak
2943 && !resolved_to_zero))
2944 && ((h->def_dynamic
2945 && !h->def_regular)
2946 || (htab->elf.dynamic_sections_created
2947 && (h->root.type == bfd_link_hash_undefweak
2948 || h->root.type == bfd_link_hash_undefined))))
2949 {
2950 /* Make sure this symbol is output as a dynamic symbol.
2951 Undefined weak syms won't yet be marked as dynamic. */
2952 if (h->dynindx == -1
2953 && !h->forced_local
2954 && !resolved_to_zero
2955 && h->root.type == bfd_link_hash_undefweak)
2956 {
2957 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2958 return FALSE;
2959 }
2960
2961 /* If that succeeded, we know we'll be keeping all the
2962 relocs. */
2963 if (h->dynindx != -1)
2964 goto keep;
2965 }
2966
2967 eh->dyn_relocs = NULL;
2968 eh->func_pointer_refcount = 0;
2969
2970 keep: ;
2971 }
2972
2973 /* Finally, allocate space. */
2974 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2975 {
2976 asection *sreloc;
2977
2978 sreloc = elf_section_data (p->sec)->sreloc;
2979
2980 BFD_ASSERT (sreloc != NULL);
2981 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2982 }
2983
2984 return TRUE;
2985 }
2986
2987 /* Allocate space in .plt, .got and associated reloc sections for
2988 local dynamic relocs. */
2989
2990 static bfd_boolean
2991 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2992 {
2993 struct elf_link_hash_entry *h
2994 = (struct elf_link_hash_entry *) *slot;
2995
2996 if (h->type != STT_GNU_IFUNC
2997 || !h->def_regular
2998 || !h->ref_regular
2999 || !h->forced_local
3000 || h->root.type != bfd_link_hash_defined)
3001 abort ();
3002
3003 return elf_i386_allocate_dynrelocs (h, inf);
3004 }
3005
3006 /* Find any dynamic relocs that apply to read-only sections. */
3007
3008 static bfd_boolean
3009 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
3010 {
3011 struct elf_i386_link_hash_entry *eh;
3012 struct elf_dyn_relocs *p;
3013
3014 /* Skip local IFUNC symbols. */
3015 if (h->forced_local && h->type == STT_GNU_IFUNC)
3016 return TRUE;
3017
3018 eh = (struct elf_i386_link_hash_entry *) h;
3019 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3020 {
3021 asection *s = p->sec->output_section;
3022
3023 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3024 {
3025 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3026
3027 info->flags |= DF_TEXTREL;
3028
3029 if ((info->warn_shared_textrel && bfd_link_pic (info))
3030 || info->error_textrel)
3031 /* xgettext:c-format */
3032 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3033 p->sec->owner, h->root.root.string,
3034 p->sec);
3035
3036 /* Not an error, just cut short the traversal. */
3037 return FALSE;
3038 }
3039 }
3040 return TRUE;
3041 }
3042
3043 /* Convert load via the GOT slot to load immediate. */
3044
3045 static bfd_boolean
3046 elf_i386_convert_load (bfd *abfd, asection *sec,
3047 struct bfd_link_info *link_info)
3048 {
3049 struct elf_i386_link_hash_table *htab;
3050 Elf_Internal_Shdr *symtab_hdr;
3051 Elf_Internal_Rela *internal_relocs;
3052 Elf_Internal_Rela *irel, *irelend;
3053 bfd_byte *contents;
3054 bfd_boolean changed;
3055 bfd_signed_vma *local_got_refcounts;
3056
3057 /* Don't even try to convert non-ELF outputs. */
3058 if (!is_elf_hash_table (link_info->hash))
3059 return FALSE;
3060
3061 /* Nothing to do if there is no need or no output. */
3062 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3063 || sec->need_convert_load == 0
3064 || bfd_is_abs_section (sec->output_section))
3065 return TRUE;
3066
3067 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3068
3069 /* Load the relocations for this section. */
3070 internal_relocs = (_bfd_elf_link_read_relocs
3071 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3072 link_info->keep_memory));
3073 if (internal_relocs == NULL)
3074 return FALSE;
3075
3076 changed = FALSE;
3077 htab = elf_i386_hash_table (link_info);
3078 local_got_refcounts = elf_local_got_refcounts (abfd);
3079
3080 /* Get the section contents. */
3081 if (elf_section_data (sec)->this_hdr.contents != NULL)
3082 contents = elf_section_data (sec)->this_hdr.contents;
3083 else
3084 {
3085 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3086 goto error_return;
3087 }
3088
3089 irelend = internal_relocs + sec->reloc_count;
3090 for (irel = internal_relocs; irel < irelend; irel++)
3091 {
3092 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3093 unsigned int r_symndx;
3094 struct elf_link_hash_entry *h;
3095 bfd_boolean converted;
3096
3097 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3098 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3099 if (r_type != R_386_GOT32X)
3100 continue;
3101
3102 r_symndx = ELF32_R_SYM (irel->r_info);
3103 if (r_symndx < symtab_hdr->sh_info)
3104 h = elf_i386_get_local_sym_hash (htab, sec->owner,
3105 (const Elf_Internal_Rela *) irel,
3106 FALSE);
3107 else
3108 {
3109 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3110 while (h->root.type == bfd_link_hash_indirect
3111 || h->root.type == bfd_link_hash_warning)
3112 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3113 }
3114
3115 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3116 if (h != NULL && h->type == STT_GNU_IFUNC)
3117 continue;
3118
3119 converted = FALSE;
3120 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
3121 irel, h, &converted, link_info))
3122 goto error_return;
3123
3124 if (converted)
3125 {
3126 changed = converted;
3127 if (h)
3128 {
3129 if (h->got.refcount > 0)
3130 h->got.refcount -= 1;
3131 }
3132 else
3133 {
3134 if (local_got_refcounts != NULL
3135 && local_got_refcounts[r_symndx] > 0)
3136 local_got_refcounts[r_symndx] -= 1;
3137 }
3138 }
3139 }
3140
3141 if (contents != NULL
3142 && elf_section_data (sec)->this_hdr.contents != contents)
3143 {
3144 if (!changed && !link_info->keep_memory)
3145 free (contents);
3146 else
3147 {
3148 /* Cache the section contents for elf_link_input_bfd. */
3149 elf_section_data (sec)->this_hdr.contents = contents;
3150 }
3151 }
3152
3153 if (elf_section_data (sec)->relocs != internal_relocs)
3154 {
3155 if (!changed)
3156 free (internal_relocs);
3157 else
3158 elf_section_data (sec)->relocs = internal_relocs;
3159 }
3160
3161 return TRUE;
3162
3163 error_return:
3164 if (contents != NULL
3165 && elf_section_data (sec)->this_hdr.contents != contents)
3166 free (contents);
3167 if (internal_relocs != NULL
3168 && elf_section_data (sec)->relocs != internal_relocs)
3169 free (internal_relocs);
3170 return FALSE;
3171 }
3172
3173 /* Set the sizes of the dynamic sections. */
3174
3175 static bfd_boolean
3176 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3177 {
3178 struct elf_i386_link_hash_table *htab;
3179 bfd *dynobj;
3180 asection *s;
3181 bfd_boolean relocs;
3182 bfd *ibfd;
3183
3184 htab = elf_i386_hash_table (info);
3185 if (htab == NULL)
3186 return FALSE;
3187 dynobj = htab->elf.dynobj;
3188 if (dynobj == NULL)
3189 abort ();
3190
3191 /* Set up .got offsets for local syms, and space for local dynamic
3192 relocs. */
3193 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3194 {
3195 bfd_signed_vma *local_got;
3196 bfd_signed_vma *end_local_got;
3197 char *local_tls_type;
3198 bfd_vma *local_tlsdesc_gotent;
3199 bfd_size_type locsymcount;
3200 Elf_Internal_Shdr *symtab_hdr;
3201 asection *srel;
3202
3203 if (! is_i386_elf (ibfd))
3204 continue;
3205
3206 for (s = ibfd->sections; s != NULL; s = s->next)
3207 {
3208 struct elf_dyn_relocs *p;
3209
3210 if (!elf_i386_convert_load (ibfd, s, info))
3211 return FALSE;
3212
3213 for (p = ((struct elf_dyn_relocs *)
3214 elf_section_data (s)->local_dynrel);
3215 p != NULL;
3216 p = p->next)
3217 {
3218 if (!bfd_is_abs_section (p->sec)
3219 && bfd_is_abs_section (p->sec->output_section))
3220 {
3221 /* Input section has been discarded, either because
3222 it is a copy of a linkonce section or due to
3223 linker script /DISCARD/, so we'll be discarding
3224 the relocs too. */
3225 }
3226 else if ((get_elf_i386_backend_data (output_bfd)->os
3227 == is_vxworks)
3228 && strcmp (p->sec->output_section->name,
3229 ".tls_vars") == 0)
3230 {
3231 /* Relocations in vxworks .tls_vars sections are
3232 handled specially by the loader. */
3233 }
3234 else if (p->count != 0)
3235 {
3236 srel = elf_section_data (p->sec)->sreloc;
3237 srel->size += p->count * sizeof (Elf32_External_Rel);
3238 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3239 && (info->flags & DF_TEXTREL) == 0)
3240 {
3241 info->flags |= DF_TEXTREL;
3242 if ((info->warn_shared_textrel && bfd_link_pic (info))
3243 || info->error_textrel)
3244 /* xgettext:c-format */
3245 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3246 p->sec->owner, p->sec);
3247 }
3248 }
3249 }
3250 }
3251
3252 local_got = elf_local_got_refcounts (ibfd);
3253 if (!local_got)
3254 continue;
3255
3256 symtab_hdr = &elf_symtab_hdr (ibfd);
3257 locsymcount = symtab_hdr->sh_info;
3258 end_local_got = local_got + locsymcount;
3259 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3260 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3261 s = htab->elf.sgot;
3262 srel = htab->elf.srelgot;
3263 for (; local_got < end_local_got;
3264 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3265 {
3266 *local_tlsdesc_gotent = (bfd_vma) -1;
3267 if (*local_got > 0)
3268 {
3269 if (GOT_TLS_GDESC_P (*local_tls_type))
3270 {
3271 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3272 - elf_i386_compute_jump_table_size (htab);
3273 htab->elf.sgotplt->size += 8;
3274 *local_got = (bfd_vma) -2;
3275 }
3276 if (! GOT_TLS_GDESC_P (*local_tls_type)
3277 || GOT_TLS_GD_P (*local_tls_type))
3278 {
3279 *local_got = s->size;
3280 s->size += 4;
3281 if (GOT_TLS_GD_P (*local_tls_type)
3282 || *local_tls_type == GOT_TLS_IE_BOTH)
3283 s->size += 4;
3284 }
3285 if (bfd_link_pic (info)
3286 || GOT_TLS_GD_ANY_P (*local_tls_type)
3287 || (*local_tls_type & GOT_TLS_IE))
3288 {
3289 if (*local_tls_type == GOT_TLS_IE_BOTH)
3290 srel->size += 2 * sizeof (Elf32_External_Rel);
3291 else if (GOT_TLS_GD_P (*local_tls_type)
3292 || ! GOT_TLS_GDESC_P (*local_tls_type))
3293 srel->size += sizeof (Elf32_External_Rel);
3294 if (GOT_TLS_GDESC_P (*local_tls_type))
3295 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3296 }
3297 }
3298 else
3299 *local_got = (bfd_vma) -1;
3300 }
3301 }
3302
3303 if (htab->tls_ldm_got.refcount > 0)
3304 {
3305 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3306 relocs. */
3307 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3308 htab->elf.sgot->size += 8;
3309 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3310 }
3311 else
3312 htab->tls_ldm_got.offset = -1;
3313
3314 /* Allocate global sym .plt and .got entries, and space for global
3315 sym dynamic relocs. */
3316 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3317
3318 /* Allocate .plt and .got entries, and space for local symbols. */
3319 htab_traverse (htab->loc_hash_table,
3320 elf_i386_allocate_local_dynrelocs,
3321 info);
3322
3323 /* For every jump slot reserved in the sgotplt, reloc_count is
3324 incremented. However, when we reserve space for TLS descriptors,
3325 it's not incremented, so in order to compute the space reserved
3326 for them, it suffices to multiply the reloc count by the jump
3327 slot size.
3328
3329 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3330 so that R_386_IRELATIVE entries come last. */
3331 if (htab->elf.srelplt)
3332 {
3333 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3334 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3335 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3336 }
3337 else if (htab->elf.irelplt)
3338 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3339
3340
3341 if (htab->elf.sgotplt)
3342 {
3343 /* Don't allocate .got.plt section if there are no GOT nor PLT
3344 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3345 if ((htab->elf.hgot == NULL
3346 || !htab->elf.hgot->ref_regular_nonweak)
3347 && (htab->elf.sgotplt->size
3348 == get_elf_backend_data (output_bfd)->got_header_size)
3349 && (htab->elf.splt == NULL
3350 || htab->elf.splt->size == 0)
3351 && (htab->elf.sgot == NULL
3352 || htab->elf.sgot->size == 0)
3353 && (htab->elf.iplt == NULL
3354 || htab->elf.iplt->size == 0)
3355 && (htab->elf.igotplt == NULL
3356 || htab->elf.igotplt->size == 0))
3357 htab->elf.sgotplt->size = 0;
3358 }
3359
3360 if (_bfd_elf_eh_frame_present (info))
3361 {
3362 if (htab->plt_eh_frame != NULL
3363 && htab->elf.splt != NULL
3364 && htab->elf.splt->size != 0
3365 && !bfd_is_abs_section (htab->elf.splt->output_section))
3366 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
3367
3368 if (htab->plt_got_eh_frame != NULL
3369 && htab->plt_got != NULL
3370 && htab->plt_got->size != 0
3371 && !bfd_is_abs_section (htab->plt_got->output_section))
3372 htab->plt_got_eh_frame->size
3373 = htab->non_lazy_plt->eh_frame_plt_size;
3374 }
3375
3376 /* We now have determined the sizes of the various dynamic sections.
3377 Allocate memory for them. */
3378 relocs = FALSE;
3379 for (s = dynobj->sections; s != NULL; s = s->next)
3380 {
3381 bfd_boolean strip_section = TRUE;
3382
3383 if ((s->flags & SEC_LINKER_CREATED) == 0)
3384 continue;
3385
3386 if (s == htab->elf.splt
3387 || s == htab->elf.sgot)
3388 {
3389 /* Strip this section if we don't need it; see the
3390 comment below. */
3391 /* We'd like to strip these sections if they aren't needed, but if
3392 we've exported dynamic symbols from them we must leave them.
3393 It's too late to tell BFD to get rid of the symbols. */
3394
3395 if (htab->elf.hplt != NULL)
3396 strip_section = FALSE;
3397 }
3398 else if (s == htab->elf.sgotplt
3399 || s == htab->elf.iplt
3400 || s == htab->elf.igotplt
3401 || s == htab->plt_got
3402 || s == htab->plt_eh_frame
3403 || s == htab->plt_got_eh_frame
3404 || s == htab->elf.sdynbss
3405 || s == htab->elf.sdynrelro)
3406 {
3407 /* Strip these too. */
3408 }
3409 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3410 {
3411 if (s->size != 0
3412 && s != htab->elf.srelplt
3413 && s != htab->srelplt2)
3414 relocs = TRUE;
3415
3416 /* We use the reloc_count field as a counter if we need
3417 to copy relocs into the output file. */
3418 s->reloc_count = 0;
3419 }
3420 else
3421 {
3422 /* It's not one of our sections, so don't allocate space. */
3423 continue;
3424 }
3425
3426 if (s->size == 0)
3427 {
3428 /* If we don't need this section, strip it from the
3429 output file. This is mostly to handle .rel.bss and
3430 .rel.plt. We must create both sections in
3431 create_dynamic_sections, because they must be created
3432 before the linker maps input sections to output
3433 sections. The linker does that before
3434 adjust_dynamic_symbol is called, and it is that
3435 function which decides whether anything needs to go
3436 into these sections. */
3437 if (strip_section)
3438 s->flags |= SEC_EXCLUDE;
3439 continue;
3440 }
3441
3442 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3443 continue;
3444
3445 /* Allocate memory for the section contents. We use bfd_zalloc
3446 here in case unused entries are not reclaimed before the
3447 section's contents are written out. This should not happen,
3448 but this way if it does, we get a R_386_NONE reloc instead
3449 of garbage. */
3450 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3451 if (s->contents == NULL)
3452 return FALSE;
3453 }
3454
3455 if (htab->plt_eh_frame != NULL
3456 && htab->plt_eh_frame->contents != NULL)
3457 {
3458 memcpy (htab->plt_eh_frame->contents,
3459 htab->plt.eh_frame_plt,
3460 htab->plt_eh_frame->size);
3461 bfd_put_32 (dynobj, htab->elf.splt->size,
3462 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3463 }
3464
3465 if (htab->plt_got_eh_frame != NULL
3466 && htab->plt_got_eh_frame->contents != NULL)
3467 {
3468 memcpy (htab->plt_got_eh_frame->contents,
3469 htab->non_lazy_plt->eh_frame_plt,
3470 htab->plt_got_eh_frame->size);
3471 bfd_put_32 (dynobj, htab->plt_got->size,
3472 (htab->plt_got_eh_frame->contents
3473 + PLT_FDE_LEN_OFFSET));
3474 }
3475
3476 if (htab->elf.dynamic_sections_created)
3477 {
3478 /* Add some entries to the .dynamic section. We fill in the
3479 values later, in elf_i386_finish_dynamic_sections, but we
3480 must add the entries now so that we get the correct size for
3481 the .dynamic section. The DT_DEBUG entry is filled in by the
3482 dynamic linker and used by the debugger. */
3483 #define add_dynamic_entry(TAG, VAL) \
3484 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3485
3486 if (bfd_link_executable (info))
3487 {
3488 if (!add_dynamic_entry (DT_DEBUG, 0))
3489 return FALSE;
3490 }
3491
3492 if (htab->elf.splt->size != 0)
3493 {
3494 /* DT_PLTGOT is used by prelink even if there is no PLT
3495 relocation. */
3496 if (!add_dynamic_entry (DT_PLTGOT, 0))
3497 return FALSE;
3498 }
3499
3500 if (htab->elf.srelplt->size != 0)
3501 {
3502 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3503 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3504 || !add_dynamic_entry (DT_JMPREL, 0))
3505 return FALSE;
3506 }
3507
3508 if (relocs)
3509 {
3510 if (!add_dynamic_entry (DT_REL, 0)
3511 || !add_dynamic_entry (DT_RELSZ, 0)
3512 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3513 return FALSE;
3514
3515 /* If any dynamic relocs apply to a read-only section,
3516 then we need a DT_TEXTREL entry. */
3517 if ((info->flags & DF_TEXTREL) == 0)
3518 elf_link_hash_traverse (&htab->elf,
3519 elf_i386_readonly_dynrelocs, info);
3520
3521 if ((info->flags & DF_TEXTREL) != 0)
3522 {
3523 if (htab->readonly_dynrelocs_against_ifunc)
3524 {
3525 info->callbacks->einfo
3526 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3527 bfd_set_error (bfd_error_bad_value);
3528 return FALSE;
3529 }
3530
3531 if (!add_dynamic_entry (DT_TEXTREL, 0))
3532 return FALSE;
3533 }
3534 }
3535 if (get_elf_i386_backend_data (output_bfd)->os == is_vxworks
3536 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3537 return FALSE;
3538 }
3539 #undef add_dynamic_entry
3540
3541 return TRUE;
3542 }
3543
3544 static bfd_boolean
3545 elf_i386_always_size_sections (bfd *output_bfd,
3546 struct bfd_link_info *info)
3547 {
3548 asection *tls_sec = elf_hash_table (info)->tls_sec;
3549
3550 if (tls_sec)
3551 {
3552 struct elf_link_hash_entry *tlsbase;
3553
3554 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3555 "_TLS_MODULE_BASE_",
3556 FALSE, FALSE, FALSE);
3557
3558 if (tlsbase && tlsbase->type == STT_TLS)
3559 {
3560 struct elf_i386_link_hash_table *htab;
3561 struct bfd_link_hash_entry *bh = NULL;
3562 const struct elf_backend_data *bed
3563 = get_elf_backend_data (output_bfd);
3564
3565 htab = elf_i386_hash_table (info);
3566 if (htab == NULL)
3567 return FALSE;
3568
3569 if (!(_bfd_generic_link_add_one_symbol
3570 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3571 tls_sec, 0, NULL, FALSE,
3572 bed->collect, &bh)))
3573 return FALSE;
3574
3575 htab->tls_module_base = bh;
3576
3577 tlsbase = (struct elf_link_hash_entry *)bh;
3578 tlsbase->def_regular = 1;
3579 tlsbase->other = STV_HIDDEN;
3580 tlsbase->root.linker_def = 1;
3581 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3582 }
3583 }
3584
3585 return TRUE;
3586 }
3587
3588 /* Set the correct type for an x86 ELF section. We do this by the
3589 section name, which is a hack, but ought to work. */
3590
3591 static bfd_boolean
3592 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3593 Elf_Internal_Shdr *hdr,
3594 asection *sec)
3595 {
3596 const char *name;
3597
3598 name = bfd_get_section_name (abfd, sec);
3599
3600 /* This is an ugly, but unfortunately necessary hack that is
3601 needed when producing EFI binaries on x86. It tells
3602 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3603 containing ELF relocation info. We need this hack in order to
3604 be able to generate ELF binaries that can be translated into
3605 EFI applications (which are essentially COFF objects). Those
3606 files contain a COFF ".reloc" section inside an ELFNN object,
3607 which would normally cause BFD to segfault because it would
3608 attempt to interpret this section as containing relocation
3609 entries for section "oc". With this hack enabled, ".reloc"
3610 will be treated as a normal data section, which will avoid the
3611 segfault. However, you won't be able to create an ELFNN binary
3612 with a section named "oc" that needs relocations, but that's
3613 the kind of ugly side-effects you get when detecting section
3614 types based on their names... In practice, this limitation is
3615 unlikely to bite. */
3616 if (strcmp (name, ".reloc") == 0)
3617 hdr->sh_type = SHT_PROGBITS;
3618
3619 return TRUE;
3620 }
3621
3622 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3623 executables. Rather than setting it to the beginning of the TLS
3624 section, we have to set it to the end. This function may be called
3625 multiple times, it is idempotent. */
3626
3627 static void
3628 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3629 {
3630 struct elf_i386_link_hash_table *htab;
3631 struct bfd_link_hash_entry *base;
3632
3633 if (!bfd_link_executable (info))
3634 return;
3635
3636 htab = elf_i386_hash_table (info);
3637 if (htab == NULL)
3638 return;
3639
3640 base = htab->tls_module_base;
3641 if (base == NULL)
3642 return;
3643
3644 base->u.def.value = htab->elf.tls_size;
3645 }
3646
3647 /* Return the base VMA address which should be subtracted from real addresses
3648 when resolving @dtpoff relocation.
3649 This is PT_TLS segment p_vaddr. */
3650
3651 static bfd_vma
3652 elf_i386_dtpoff_base (struct bfd_link_info *info)
3653 {
3654 /* If tls_sec is NULL, we should have signalled an error already. */
3655 if (elf_hash_table (info)->tls_sec == NULL)
3656 return 0;
3657 return elf_hash_table (info)->tls_sec->vma;
3658 }
3659
3660 /* Return the relocation value for @tpoff relocation
3661 if STT_TLS virtual address is ADDRESS. */
3662
3663 static bfd_vma
3664 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3665 {
3666 struct elf_link_hash_table *htab = elf_hash_table (info);
3667 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3668 bfd_vma static_tls_size;
3669
3670 /* If tls_sec is NULL, we should have signalled an error already. */
3671 if (htab->tls_sec == NULL)
3672 return 0;
3673
3674 /* Consider special static TLS alignment requirements. */
3675 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3676 return static_tls_size + htab->tls_sec->vma - address;
3677 }
3678
3679 /* Relocate an i386 ELF section. */
3680
3681 static bfd_boolean
3682 elf_i386_relocate_section (bfd *output_bfd,
3683 struct bfd_link_info *info,
3684 bfd *input_bfd,
3685 asection *input_section,
3686 bfd_byte *contents,
3687 Elf_Internal_Rela *relocs,
3688 Elf_Internal_Sym *local_syms,
3689 asection **local_sections)
3690 {
3691 struct elf_i386_link_hash_table *htab;
3692 Elf_Internal_Shdr *symtab_hdr;
3693 struct elf_link_hash_entry **sym_hashes;
3694 bfd_vma *local_got_offsets;
3695 bfd_vma *local_tlsdesc_gotents;
3696 Elf_Internal_Rela *rel;
3697 Elf_Internal_Rela *wrel;
3698 Elf_Internal_Rela *relend;
3699 bfd_boolean is_vxworks_tls;
3700 unsigned plt_entry_size;
3701
3702 BFD_ASSERT (is_i386_elf (input_bfd));
3703
3704 /* Skip if check_relocs failed. */
3705 if (input_section->check_relocs_failed)
3706 return FALSE;
3707
3708 htab = elf_i386_hash_table (info);
3709 if (htab == NULL)
3710 return FALSE;
3711 symtab_hdr = &elf_symtab_hdr (input_bfd);
3712 sym_hashes = elf_sym_hashes (input_bfd);
3713 local_got_offsets = elf_local_got_offsets (input_bfd);
3714 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3715 /* We have to handle relocations in vxworks .tls_vars sections
3716 specially, because the dynamic loader is 'weird'. */
3717 is_vxworks_tls = ((get_elf_i386_backend_data (output_bfd)->os
3718 == is_vxworks)
3719 && bfd_link_pic (info)
3720 && !strcmp (input_section->output_section->name,
3721 ".tls_vars"));
3722
3723 elf_i386_set_tls_module_base (info);
3724
3725 plt_entry_size = htab->plt.plt_entry_size;
3726
3727 rel = wrel = relocs;
3728 relend = relocs + input_section->reloc_count;
3729 for (; rel < relend; wrel++, rel++)
3730 {
3731 unsigned int r_type;
3732 reloc_howto_type *howto;
3733 unsigned long r_symndx;
3734 struct elf_link_hash_entry *h;
3735 struct elf_i386_link_hash_entry *eh;
3736 Elf_Internal_Sym *sym;
3737 asection *sec;
3738 bfd_vma off, offplt, plt_offset;
3739 bfd_vma relocation;
3740 bfd_boolean unresolved_reloc;
3741 bfd_reloc_status_type r;
3742 unsigned int indx;
3743 int tls_type;
3744 bfd_vma st_size;
3745 asection *resolved_plt;
3746 bfd_boolean resolved_to_zero;
3747 bfd_boolean relative_reloc;
3748
3749 r_type = ELF32_R_TYPE (rel->r_info);
3750 if (r_type == R_386_GNU_VTINHERIT
3751 || r_type == R_386_GNU_VTENTRY)
3752 {
3753 if (wrel != rel)
3754 *wrel = *rel;
3755 continue;
3756 }
3757
3758 if ((indx = r_type) >= R_386_standard
3759 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3760 >= R_386_ext - R_386_standard)
3761 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3762 >= R_386_ext2 - R_386_ext))
3763 {
3764 _bfd_error_handler
3765 /* xgettext:c-format */
3766 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3767 input_bfd, r_type, input_section);
3768 bfd_set_error (bfd_error_bad_value);
3769 return FALSE;
3770 }
3771 howto = elf_howto_table + indx;
3772
3773 r_symndx = ELF32_R_SYM (rel->r_info);
3774 h = NULL;
3775 sym = NULL;
3776 sec = NULL;
3777 unresolved_reloc = FALSE;
3778 if (r_symndx < symtab_hdr->sh_info)
3779 {
3780 sym = local_syms + r_symndx;
3781 sec = local_sections[r_symndx];
3782 relocation = (sec->output_section->vma
3783 + sec->output_offset
3784 + sym->st_value);
3785 st_size = sym->st_size;
3786
3787 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3788 && ((sec->flags & SEC_MERGE) != 0
3789 || (bfd_link_relocatable (info)
3790 && sec->output_offset != 0)))
3791 {
3792 bfd_vma addend;
3793 bfd_byte *where = contents + rel->r_offset;
3794
3795 switch (howto->size)
3796 {
3797 case 0:
3798 addend = bfd_get_8 (input_bfd, where);
3799 if (howto->pc_relative)
3800 {
3801 addend = (addend ^ 0x80) - 0x80;
3802 addend += 1;
3803 }
3804 break;
3805 case 1:
3806 addend = bfd_get_16 (input_bfd, where);
3807 if (howto->pc_relative)
3808 {
3809 addend = (addend ^ 0x8000) - 0x8000;
3810 addend += 2;
3811 }
3812 break;
3813 case 2:
3814 addend = bfd_get_32 (input_bfd, where);
3815 if (howto->pc_relative)
3816 {
3817 addend = (addend ^ 0x80000000) - 0x80000000;
3818 addend += 4;
3819 }
3820 break;
3821 default:
3822 abort ();
3823 }
3824
3825 if (bfd_link_relocatable (info))
3826 addend += sec->output_offset;
3827 else
3828 {
3829 asection *msec = sec;
3830 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3831 addend);
3832 addend -= relocation;
3833 addend += msec->output_section->vma + msec->output_offset;
3834 }
3835
3836 switch (howto->size)
3837 {
3838 case 0:
3839 /* FIXME: overflow checks. */
3840 if (howto->pc_relative)
3841 addend -= 1;
3842 bfd_put_8 (input_bfd, addend, where);
3843 break;
3844 case 1:
3845 if (howto->pc_relative)
3846 addend -= 2;
3847 bfd_put_16 (input_bfd, addend, where);
3848 break;
3849 case 2:
3850 if (howto->pc_relative)
3851 addend -= 4;
3852 bfd_put_32 (input_bfd, addend, where);
3853 break;
3854 }
3855 }
3856 else if (!bfd_link_relocatable (info)
3857 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3858 {
3859 /* Relocate against local STT_GNU_IFUNC symbol. */
3860 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3861 FALSE);
3862 if (h == NULL)
3863 abort ();
3864
3865 /* Set STT_GNU_IFUNC symbol value. */
3866 h->root.u.def.value = sym->st_value;
3867 h->root.u.def.section = sec;
3868 }
3869 }
3870 else
3871 {
3872 bfd_boolean warned ATTRIBUTE_UNUSED;
3873 bfd_boolean ignored ATTRIBUTE_UNUSED;
3874
3875 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3876 r_symndx, symtab_hdr, sym_hashes,
3877 h, sec, relocation,
3878 unresolved_reloc, warned, ignored);
3879 st_size = h->size;
3880 }
3881
3882 if (sec != NULL && discarded_section (sec))
3883 {
3884 _bfd_clear_contents (howto, input_bfd, input_section,
3885 contents + rel->r_offset);
3886 wrel->r_offset = rel->r_offset;
3887 wrel->r_info = 0;
3888 wrel->r_addend = 0;
3889
3890 /* For ld -r, remove relocations in debug sections against
3891 sections defined in discarded sections. Not done for
3892 eh_frame editing code expects to be present. */
3893 if (bfd_link_relocatable (info)
3894 && (input_section->flags & SEC_DEBUGGING))
3895 wrel--;
3896
3897 continue;
3898 }
3899
3900 if (bfd_link_relocatable (info))
3901 {
3902 if (wrel != rel)
3903 *wrel = *rel;
3904 continue;
3905 }
3906
3907 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3908 it here if it is defined in a non-shared object. */
3909 if (h != NULL
3910 && h->type == STT_GNU_IFUNC
3911 && h->def_regular)
3912 {
3913 asection *plt, *gotplt, *base_got;
3914 bfd_vma plt_index;
3915 const char *name;
3916
3917 if ((input_section->flags & SEC_ALLOC) == 0)
3918 {
3919 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3920 sections because such sections are not SEC_ALLOC and
3921 thus ld.so will not process them. */
3922 if ((input_section->flags & SEC_DEBUGGING) != 0)
3923 continue;
3924 abort ();
3925 }
3926
3927 /* STT_GNU_IFUNC symbol must go through PLT. */
3928 if (htab->elf.splt != NULL)
3929 {
3930 plt = htab->elf.splt;
3931 gotplt = htab->elf.sgotplt;
3932 }
3933 else
3934 {
3935 plt = htab->elf.iplt;
3936 gotplt = htab->elf.igotplt;
3937 }
3938
3939 switch (r_type)
3940 {
3941 default:
3942 break;
3943
3944 case R_386_GOT32:
3945 case R_386_GOT32X:
3946 base_got = htab->elf.sgot;
3947 off = h->got.offset;
3948
3949 if (base_got == NULL)
3950 abort ();
3951
3952 if (off == (bfd_vma) -1)
3953 {
3954 /* We can't use h->got.offset here to save state, or
3955 even just remember the offset, as finish_dynamic_symbol
3956 would use that as offset into .got. */
3957
3958 if (h->plt.offset == (bfd_vma) -1)
3959 abort ();
3960
3961 if (htab->elf.splt != NULL)
3962 {
3963 plt_index = (h->plt.offset / plt_entry_size
3964 - htab->plt.has_plt0);
3965 off = (plt_index + 3) * 4;
3966 base_got = htab->elf.sgotplt;
3967 }
3968 else
3969 {
3970 plt_index = h->plt.offset / plt_entry_size;
3971 off = plt_index * 4;
3972 base_got = htab->elf.igotplt;
3973 }
3974
3975 if (h->dynindx == -1
3976 || h->forced_local
3977 || info->symbolic)
3978 {
3979 /* This references the local defitionion. We must
3980 initialize this entry in the global offset table.
3981 Since the offset must always be a multiple of 8,
3982 we use the least significant bit to record
3983 whether we have initialized it already.
3984
3985 When doing a dynamic link, we create a .rela.got
3986 relocation entry to initialize the value. This
3987 is done in the finish_dynamic_symbol routine. */
3988 if ((off & 1) != 0)
3989 off &= ~1;
3990 else
3991 {
3992 bfd_put_32 (output_bfd, relocation,
3993 base_got->contents + off);
3994 h->got.offset |= 1;
3995 }
3996 }
3997
3998 relocation = off;
3999 }
4000 else
4001 relocation = (base_got->output_section->vma
4002 + base_got->output_offset + off
4003 - gotplt->output_section->vma
4004 - gotplt->output_offset);
4005
4006 if (rel->r_offset > 1
4007 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4008 && *(contents + rel->r_offset - 2) != 0x8d)
4009 {
4010 if (bfd_link_pic (info))
4011 goto disallow_got32;
4012
4013 /* Add the GOT base if there is no base register. */
4014 relocation += (gotplt->output_section->vma
4015 + gotplt->output_offset);
4016 }
4017 else if (htab->elf.splt == NULL)
4018 {
4019 /* Adjust for static executables. */
4020 relocation += gotplt->output_offset;
4021 }
4022
4023 goto do_relocation;
4024 }
4025
4026 if (h->plt.offset == (bfd_vma) -1)
4027 {
4028 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4029 if (r_type == R_386_32
4030 && (input_section->flags & SEC_CODE) == 0)
4031 goto do_ifunc_pointer;
4032 goto bad_ifunc_reloc;
4033 }
4034
4035 relocation = (plt->output_section->vma
4036 + plt->output_offset + h->plt.offset);
4037
4038 switch (r_type)
4039 {
4040 default:
4041 bad_ifunc_reloc:
4042 if (h->root.root.string)
4043 name = h->root.root.string;
4044 else
4045 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4046 NULL);
4047 _bfd_error_handler
4048 /* xgettext:c-format */
4049 (_("%B: relocation %s against STT_GNU_IFUNC "
4050 "symbol `%s' isn't supported"), input_bfd,
4051 howto->name, name);
4052 bfd_set_error (bfd_error_bad_value);
4053 return FALSE;
4054
4055 case R_386_32:
4056 /* Generate dynamic relcoation only when there is a
4057 non-GOT reference in a shared object. */
4058 if ((bfd_link_pic (info) && h->non_got_ref)
4059 || h->plt.offset == (bfd_vma) -1)
4060 {
4061 Elf_Internal_Rela outrel;
4062 asection *sreloc;
4063 bfd_vma offset;
4064
4065 do_ifunc_pointer:
4066 /* Need a dynamic relocation to get the real function
4067 adddress. */
4068 offset = _bfd_elf_section_offset (output_bfd,
4069 info,
4070 input_section,
4071 rel->r_offset);
4072 if (offset == (bfd_vma) -1
4073 || offset == (bfd_vma) -2)
4074 abort ();
4075
4076 outrel.r_offset = (input_section->output_section->vma
4077 + input_section->output_offset
4078 + offset);
4079
4080 if (h->dynindx == -1
4081 || h->forced_local
4082 || bfd_link_executable (info))
4083 {
4084 /* This symbol is resolved locally. */
4085 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4086 bfd_put_32 (output_bfd,
4087 (h->root.u.def.value
4088 + h->root.u.def.section->output_section->vma
4089 + h->root.u.def.section->output_offset),
4090 contents + offset);
4091 }
4092 else
4093 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4094
4095 /* Dynamic relocations are stored in
4096 1. .rel.ifunc section in PIC object.
4097 2. .rel.got section in dynamic executable.
4098 3. .rel.iplt section in static executable. */
4099 if (bfd_link_pic (info))
4100 sreloc = htab->elf.irelifunc;
4101 else if (htab->elf.splt != NULL)
4102 sreloc = htab->elf.srelgot;
4103 else
4104 sreloc = htab->elf.irelplt;
4105 elf_append_rel (output_bfd, sreloc, &outrel);
4106
4107 /* If this reloc is against an external symbol, we
4108 do not want to fiddle with the addend. Otherwise,
4109 we need to include the symbol value so that it
4110 becomes an addend for the dynamic reloc. For an
4111 internal symbol, we have updated addend. */
4112 continue;
4113 }
4114 /* FALLTHROUGH */
4115 case R_386_PC32:
4116 case R_386_PLT32:
4117 goto do_relocation;
4118
4119 case R_386_GOTOFF:
4120 relocation -= (gotplt->output_section->vma
4121 + gotplt->output_offset);
4122 goto do_relocation;
4123 }
4124 }
4125
4126 eh = (struct elf_i386_link_hash_entry *) h;
4127 resolved_to_zero = (eh != NULL
4128 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4129 eh->has_got_reloc,
4130 eh));
4131
4132 switch (r_type)
4133 {
4134 case R_386_GOT32X:
4135 /* Avoid optimizing _DYNAMIC since ld.so may use its
4136 link-time address. */
4137 if (h == htab->elf.hdynamic)
4138 goto r_386_got32;
4139
4140 if (bfd_link_pic (info))
4141 {
4142 /* It is OK to convert mov to lea and convert indirect
4143 branch to direct branch. It is OK to convert adc,
4144 add, and, cmp, or, sbb, sub, test, xor only when PIC
4145 is false. */
4146 unsigned int opcode, addend;
4147 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4148 if (addend != 0)
4149 goto r_386_got32;
4150 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4151 if (opcode != 0x8b && opcode != 0xff)
4152 goto r_386_got32;
4153 }
4154
4155 /* Resolve "mov GOT[(%reg)], %reg",
4156 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4157 and "binop foo@GOT[(%reg)], %reg". */
4158 if (h == NULL
4159 || (h->plt.offset == (bfd_vma) -1
4160 && h->got.offset == (bfd_vma) -1)
4161 || htab->elf.sgotplt == NULL)
4162 abort ();
4163
4164 offplt = (htab->elf.sgotplt->output_section->vma
4165 + htab->elf.sgotplt->output_offset);
4166
4167 /* It is relative to .got.plt section. */
4168 if (h->got.offset != (bfd_vma) -1)
4169 /* Use GOT entry. Mask off the least significant bit in
4170 GOT offset which may be set by R_386_GOT32 processing
4171 below. */
4172 relocation = (htab->elf.sgot->output_section->vma
4173 + htab->elf.sgot->output_offset
4174 + (h->got.offset & ~1) - offplt);
4175 else
4176 /* Use GOTPLT entry. */
4177 relocation = (h->plt.offset / plt_entry_size
4178 - htab->plt.has_plt0 + 3) * 4;
4179
4180 if (!bfd_link_pic (info))
4181 {
4182 /* If not PIC, add the .got.plt section address for
4183 baseless addressing. */
4184 unsigned int modrm;
4185 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4186 if ((modrm & 0xc7) == 0x5)
4187 relocation += offplt;
4188 }
4189
4190 unresolved_reloc = FALSE;
4191 break;
4192
4193 case R_386_GOT32:
4194 r_386_got32:
4195 /* Relocation is to the entry for this symbol in the global
4196 offset table. */
4197 if (htab->elf.sgot == NULL)
4198 abort ();
4199
4200 relative_reloc = FALSE;
4201 if (h != NULL)
4202 {
4203 bfd_boolean dyn;
4204
4205 off = h->got.offset;
4206 dyn = htab->elf.dynamic_sections_created;
4207 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4208 bfd_link_pic (info),
4209 h)
4210 || (bfd_link_pic (info)
4211 && SYMBOL_REFERENCES_LOCAL (info, h))
4212 || (ELF_ST_VISIBILITY (h->other)
4213 && h->root.type == bfd_link_hash_undefweak))
4214 {
4215 /* This is actually a static link, or it is a
4216 -Bsymbolic link and the symbol is defined
4217 locally, or the symbol was forced to be local
4218 because of a version file. We must initialize
4219 this entry in the global offset table. Since the
4220 offset must always be a multiple of 4, we use the
4221 least significant bit to record whether we have
4222 initialized it already.
4223
4224 When doing a dynamic link, we create a .rel.got
4225 relocation entry to initialize the value. This
4226 is done in the finish_dynamic_symbol routine. */
4227 if ((off & 1) != 0)
4228 off &= ~1;
4229 else
4230 {
4231 bfd_put_32 (output_bfd, relocation,
4232 htab->elf.sgot->contents + off);
4233 h->got.offset |= 1;
4234
4235 if (h->dynindx == -1
4236 && !h->forced_local
4237 && h->root.type != bfd_link_hash_undefweak
4238 && bfd_link_pic (info))
4239 {
4240 /* PR ld/21402: If this symbol isn't dynamic
4241 in PIC, generate R_386_RELATIVE here. */
4242 eh->no_finish_dynamic_symbol = 1;
4243 relative_reloc = TRUE;
4244 }
4245 }
4246 }
4247 else
4248 unresolved_reloc = FALSE;
4249 }
4250 else
4251 {
4252 if (local_got_offsets == NULL)
4253 abort ();
4254
4255 off = local_got_offsets[r_symndx];
4256
4257 /* The offset must always be a multiple of 4. We use
4258 the least significant bit to record whether we have
4259 already generated the necessary reloc. */
4260 if ((off & 1) != 0)
4261 off &= ~1;
4262 else
4263 {
4264 bfd_put_32 (output_bfd, relocation,
4265 htab->elf.sgot->contents + off);
4266 local_got_offsets[r_symndx] |= 1;
4267
4268 if (bfd_link_pic (info))
4269 relative_reloc = TRUE;
4270 }
4271 }
4272
4273 if (relative_reloc)
4274 {
4275 asection *s;
4276 Elf_Internal_Rela outrel;
4277
4278 s = htab->elf.srelgot;
4279 if (s == NULL)
4280 abort ();
4281
4282 outrel.r_offset = (htab->elf.sgot->output_section->vma
4283 + htab->elf.sgot->output_offset
4284 + off);
4285 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4286 elf_append_rel (output_bfd, s, &outrel);
4287 }
4288
4289 if (off >= (bfd_vma) -2)
4290 abort ();
4291
4292 relocation = (htab->elf.sgot->output_section->vma
4293 + htab->elf.sgot->output_offset + off);
4294 if (rel->r_offset > 1
4295 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4296 && *(contents + rel->r_offset - 2) != 0x8d)
4297 {
4298 if (bfd_link_pic (info))
4299 {
4300 /* For PIC, disallow R_386_GOT32 without a base
4301 register, except for "lea foo@GOT, %reg", since
4302 we don't know what the GOT base is. */
4303 const char *name;
4304
4305 disallow_got32:
4306 if (h == NULL || h->root.root.string == NULL)
4307 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4308 NULL);
4309 else
4310 name = h->root.root.string;
4311
4312 _bfd_error_handler
4313 /* xgettext:c-format */
4314 (_("%B: direct GOT relocation %s against `%s'"
4315 " without base register can not be used"
4316 " when making a shared object"),
4317 input_bfd, howto->name, name);
4318 bfd_set_error (bfd_error_bad_value);
4319 return FALSE;
4320 }
4321 }
4322 else
4323 {
4324 /* Subtract the .got.plt section address only with a base
4325 register. */
4326 relocation -= (htab->elf.sgotplt->output_section->vma
4327 + htab->elf.sgotplt->output_offset);
4328 }
4329
4330 break;
4331
4332 case R_386_GOTOFF:
4333 /* Relocation is relative to the start of the global offset
4334 table. */
4335
4336 /* Check to make sure it isn't a protected function or data
4337 symbol for shared library since it may not be local when
4338 used as function address or with copy relocation. We also
4339 need to make sure that a symbol is referenced locally. */
4340 if (!bfd_link_executable (info) && h)
4341 {
4342 if (!h->def_regular)
4343 {
4344 const char *v;
4345
4346 switch (ELF_ST_VISIBILITY (h->other))
4347 {
4348 case STV_HIDDEN:
4349 v = _("hidden symbol");
4350 break;
4351 case STV_INTERNAL:
4352 v = _("internal symbol");
4353 break;
4354 case STV_PROTECTED:
4355 v = _("protected symbol");
4356 break;
4357 default:
4358 v = _("symbol");
4359 break;
4360 }
4361
4362 _bfd_error_handler
4363 /* xgettext:c-format */
4364 (_("%B: relocation R_386_GOTOFF against undefined %s"
4365 " `%s' can not be used when making a shared object"),
4366 input_bfd, v, h->root.root.string);
4367 bfd_set_error (bfd_error_bad_value);
4368 return FALSE;
4369 }
4370 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4371 && (h->type == STT_FUNC
4372 || h->type == STT_OBJECT)
4373 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4374 {
4375 _bfd_error_handler
4376 /* xgettext:c-format */
4377 (_("%B: relocation R_386_GOTOFF against protected %s"
4378 " `%s' can not be used when making a shared object"),
4379 input_bfd,
4380 h->type == STT_FUNC ? "function" : "data",
4381 h->root.root.string);
4382 bfd_set_error (bfd_error_bad_value);
4383 return FALSE;
4384 }
4385 }
4386
4387 /* Note that sgot is not involved in this
4388 calculation. We always want the start of .got.plt. If we
4389 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4390 permitted by the ABI, we might have to change this
4391 calculation. */
4392 relocation -= htab->elf.sgotplt->output_section->vma
4393 + htab->elf.sgotplt->output_offset;
4394 break;
4395
4396 case R_386_GOTPC:
4397 /* Use global offset table as symbol value. */
4398 relocation = htab->elf.sgotplt->output_section->vma
4399 + htab->elf.sgotplt->output_offset;
4400 unresolved_reloc = FALSE;
4401 break;
4402
4403 case R_386_PLT32:
4404 /* Relocation is to the entry for this symbol in the
4405 procedure linkage table. */
4406
4407 /* Resolve a PLT32 reloc against a local symbol directly,
4408 without using the procedure linkage table. */
4409 if (h == NULL)
4410 break;
4411
4412 if ((h->plt.offset == (bfd_vma) -1
4413 && eh->plt_got.offset == (bfd_vma) -1)
4414 || htab->elf.splt == NULL)
4415 {
4416 /* We didn't make a PLT entry for this symbol. This
4417 happens when statically linking PIC code, or when
4418 using -Bsymbolic. */
4419 break;
4420 }
4421
4422 if (h->plt.offset != (bfd_vma) -1)
4423 {
4424 resolved_plt = htab->elf.splt;
4425 plt_offset = h->plt.offset;
4426 }
4427 else
4428 {
4429 resolved_plt = htab->plt_got;
4430 plt_offset = eh->plt_got.offset;
4431 }
4432
4433 relocation = (resolved_plt->output_section->vma
4434 + resolved_plt->output_offset
4435 + plt_offset);
4436 unresolved_reloc = FALSE;
4437 break;
4438
4439 case R_386_SIZE32:
4440 /* Set to symbol size. */
4441 relocation = st_size;
4442 /* Fall through. */
4443
4444 case R_386_32:
4445 case R_386_PC32:
4446 if ((input_section->flags & SEC_ALLOC) == 0
4447 || is_vxworks_tls)
4448 break;
4449
4450 /* Copy dynamic function pointer relocations. Don't generate
4451 dynamic relocations against resolved undefined weak symbols
4452 in PIE, except for R_386_PC32. */
4453 if ((bfd_link_pic (info)
4454 && (h == NULL
4455 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4456 && (!resolved_to_zero
4457 || r_type == R_386_PC32))
4458 || h->root.type != bfd_link_hash_undefweak))
4459 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4460 || !SYMBOL_CALLS_LOCAL (info, h)))
4461 || (ELIMINATE_COPY_RELOCS
4462 && !bfd_link_pic (info)
4463 && h != NULL
4464 && h->dynindx != -1
4465 && (!h->non_got_ref
4466 || eh->func_pointer_refcount > 0
4467 || (h->root.type == bfd_link_hash_undefweak
4468 && !resolved_to_zero))
4469 && ((h->def_dynamic && !h->def_regular)
4470 /* Undefined weak symbol is bound locally when
4471 PIC is false. */
4472 || h->root.type == bfd_link_hash_undefweak)))
4473 {
4474 Elf_Internal_Rela outrel;
4475 bfd_boolean skip, relocate;
4476 asection *sreloc;
4477
4478 /* When generating a shared object, these relocations
4479 are copied into the output file to be resolved at run
4480 time. */
4481
4482 skip = FALSE;
4483 relocate = FALSE;
4484
4485 outrel.r_offset =
4486 _bfd_elf_section_offset (output_bfd, info, input_section,
4487 rel->r_offset);
4488 if (outrel.r_offset == (bfd_vma) -1)
4489 skip = TRUE;
4490 else if (outrel.r_offset == (bfd_vma) -2)
4491 skip = TRUE, relocate = TRUE;
4492 outrel.r_offset += (input_section->output_section->vma
4493 + input_section->output_offset);
4494
4495 if (skip)
4496 memset (&outrel, 0, sizeof outrel);
4497 else if (h != NULL
4498 && h->dynindx != -1
4499 && (r_type == R_386_PC32
4500 || !(bfd_link_executable (info)
4501 || SYMBOLIC_BIND (info, h))
4502 || !h->def_regular))
4503 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4504 else
4505 {
4506 /* This symbol is local, or marked to become local. */
4507 relocate = TRUE;
4508 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4509 }
4510
4511 sreloc = elf_section_data (input_section)->sreloc;
4512
4513 if (sreloc == NULL || sreloc->contents == NULL)
4514 {
4515 r = bfd_reloc_notsupported;
4516 goto check_relocation_error;
4517 }
4518
4519 elf_append_rel (output_bfd, sreloc, &outrel);
4520
4521 /* If this reloc is against an external symbol, we do
4522 not want to fiddle with the addend. Otherwise, we
4523 need to include the symbol value so that it becomes
4524 an addend for the dynamic reloc. */
4525 if (! relocate)
4526 continue;
4527 }
4528 break;
4529
4530 case R_386_TLS_IE:
4531 if (!bfd_link_executable (info))
4532 {
4533 Elf_Internal_Rela outrel;
4534 asection *sreloc;
4535
4536 outrel.r_offset = rel->r_offset
4537 + input_section->output_section->vma
4538 + input_section->output_offset;
4539 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4540 sreloc = elf_section_data (input_section)->sreloc;
4541 if (sreloc == NULL)
4542 abort ();
4543 elf_append_rel (output_bfd, sreloc, &outrel);
4544 }
4545 /* Fall through */
4546
4547 case R_386_TLS_GD:
4548 case R_386_TLS_GOTDESC:
4549 case R_386_TLS_DESC_CALL:
4550 case R_386_TLS_IE_32:
4551 case R_386_TLS_GOTIE:
4552 tls_type = GOT_UNKNOWN;
4553 if (h == NULL && local_got_offsets)
4554 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4555 else if (h != NULL)
4556 tls_type = elf_i386_hash_entry(h)->tls_type;
4557 if (tls_type == GOT_TLS_IE)
4558 tls_type = GOT_TLS_IE_NEG;
4559
4560 if (! elf_i386_tls_transition (info, input_bfd,
4561 input_section, contents,
4562 symtab_hdr, sym_hashes,
4563 &r_type, tls_type, rel,
4564 relend, h, r_symndx, TRUE))
4565 return FALSE;
4566
4567 if (r_type == R_386_TLS_LE_32)
4568 {
4569 BFD_ASSERT (! unresolved_reloc);
4570 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4571 {
4572 unsigned int type;
4573 bfd_vma roff;
4574
4575 /* GD->LE transition. */
4576 type = *(contents + rel->r_offset - 2);
4577 if (type == 0x04)
4578 {
4579 /* Change
4580 leal foo@tlsgd(,%ebx,1), %eax
4581 call ___tls_get_addr@PLT
4582 into:
4583 movl %gs:0, %eax
4584 subl $foo@tpoff, %eax
4585 (6 byte form of subl). */
4586 roff = rel->r_offset + 5;
4587 }
4588 else
4589 {
4590 /* Change
4591 leal foo@tlsgd(%ebx), %eax
4592 call ___tls_get_addr@PLT
4593 nop
4594 or
4595 leal foo@tlsgd(%reg), %eax
4596 call *___tls_get_addr@GOT(%reg)
4597 which may be converted to
4598 addr32 call ___tls_get_addr
4599 into:
4600 movl %gs:0, %eax; subl $foo@tpoff, %eax
4601 (6 byte form of subl). */
4602 roff = rel->r_offset + 6;
4603 }
4604 memcpy (contents + roff - 8,
4605 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4606 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4607 contents + roff);
4608 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4609 rel++;
4610 wrel++;
4611 continue;
4612 }
4613 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4614 {
4615 /* GDesc -> LE transition.
4616 It's originally something like:
4617 leal x@tlsdesc(%ebx), %eax
4618
4619 leal x@ntpoff, %eax
4620
4621 Registers other than %eax may be set up here. */
4622
4623 unsigned int val;
4624 bfd_vma roff;
4625
4626 roff = rel->r_offset;
4627 val = bfd_get_8 (input_bfd, contents + roff - 1);
4628
4629 /* Now modify the instruction as appropriate. */
4630 /* aoliva FIXME: remove the above and xor the byte
4631 below with 0x86. */
4632 bfd_put_8 (output_bfd, val ^ 0x86,
4633 contents + roff - 1);
4634 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4635 contents + roff);
4636 continue;
4637 }
4638 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4639 {
4640 /* GDesc -> LE transition.
4641 It's originally:
4642 call *(%eax)
4643 Turn it into:
4644 xchg %ax,%ax */
4645
4646 bfd_vma roff;
4647
4648 roff = rel->r_offset;
4649 bfd_put_8 (output_bfd, 0x66, contents + roff);
4650 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4651 continue;
4652 }
4653 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4654 {
4655 unsigned int val;
4656
4657 /* IE->LE transition:
4658 Originally it can be one of:
4659 movl foo, %eax
4660 movl foo, %reg
4661 addl foo, %reg
4662 We change it into:
4663 movl $foo, %eax
4664 movl $foo, %reg
4665 addl $foo, %reg. */
4666 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4667 if (val == 0xa1)
4668 {
4669 /* movl foo, %eax. */
4670 bfd_put_8 (output_bfd, 0xb8,
4671 contents + rel->r_offset - 1);
4672 }
4673 else
4674 {
4675 unsigned int type;
4676
4677 type = bfd_get_8 (input_bfd,
4678 contents + rel->r_offset - 2);
4679 switch (type)
4680 {
4681 case 0x8b:
4682 /* movl */
4683 bfd_put_8 (output_bfd, 0xc7,
4684 contents + rel->r_offset - 2);
4685 bfd_put_8 (output_bfd,
4686 0xc0 | ((val >> 3) & 7),
4687 contents + rel->r_offset - 1);
4688 break;
4689 case 0x03:
4690 /* addl */
4691 bfd_put_8 (output_bfd, 0x81,
4692 contents + rel->r_offset - 2);
4693 bfd_put_8 (output_bfd,
4694 0xc0 | ((val >> 3) & 7),
4695 contents + rel->r_offset - 1);
4696 break;
4697 default:
4698 BFD_FAIL ();
4699 break;
4700 }
4701 }
4702 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4703 contents + rel->r_offset);
4704 continue;
4705 }
4706 else
4707 {
4708 unsigned int val, type;
4709
4710 /* {IE_32,GOTIE}->LE transition:
4711 Originally it can be one of:
4712 subl foo(%reg1), %reg2
4713 movl foo(%reg1), %reg2
4714 addl foo(%reg1), %reg2
4715 We change it into:
4716 subl $foo, %reg2
4717 movl $foo, %reg2 (6 byte form)
4718 addl $foo, %reg2. */
4719 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4720 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4721 if (type == 0x8b)
4722 {
4723 /* movl */
4724 bfd_put_8 (output_bfd, 0xc7,
4725 contents + rel->r_offset - 2);
4726 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4727 contents + rel->r_offset - 1);
4728 }
4729 else if (type == 0x2b)
4730 {
4731 /* subl */
4732 bfd_put_8 (output_bfd, 0x81,
4733 contents + rel->r_offset - 2);
4734 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4735 contents + rel->r_offset - 1);
4736 }
4737 else if (type == 0x03)
4738 {
4739 /* addl */
4740 bfd_put_8 (output_bfd, 0x81,
4741 contents + rel->r_offset - 2);
4742 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4743 contents + rel->r_offset - 1);
4744 }
4745 else
4746 BFD_FAIL ();
4747 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4748 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4749 contents + rel->r_offset);
4750 else
4751 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4752 contents + rel->r_offset);
4753 continue;
4754 }
4755 }
4756
4757 if (htab->elf.sgot == NULL)
4758 abort ();
4759
4760 if (h != NULL)
4761 {
4762 off = h->got.offset;
4763 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4764 }
4765 else
4766 {
4767 if (local_got_offsets == NULL)
4768 abort ();
4769
4770 off = local_got_offsets[r_symndx];
4771 offplt = local_tlsdesc_gotents[r_symndx];
4772 }
4773
4774 if ((off & 1) != 0)
4775 off &= ~1;
4776 else
4777 {
4778 Elf_Internal_Rela outrel;
4779 int dr_type;
4780 asection *sreloc;
4781
4782 if (htab->elf.srelgot == NULL)
4783 abort ();
4784
4785 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4786
4787 if (GOT_TLS_GDESC_P (tls_type))
4788 {
4789 bfd_byte *loc;
4790 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4791 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4792 <= htab->elf.sgotplt->size);
4793 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4794 + htab->elf.sgotplt->output_offset
4795 + offplt
4796 + htab->sgotplt_jump_table_size);
4797 sreloc = htab->elf.srelplt;
4798 loc = sreloc->contents;
4799 loc += (htab->next_tls_desc_index++
4800 * sizeof (Elf32_External_Rel));
4801 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4802 <= sreloc->contents + sreloc->size);
4803 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4804 if (indx == 0)
4805 {
4806 BFD_ASSERT (! unresolved_reloc);
4807 bfd_put_32 (output_bfd,
4808 relocation - elf_i386_dtpoff_base (info),
4809 htab->elf.sgotplt->contents + offplt
4810 + htab->sgotplt_jump_table_size + 4);
4811 }
4812 else
4813 {
4814 bfd_put_32 (output_bfd, 0,
4815 htab->elf.sgotplt->contents + offplt
4816 + htab->sgotplt_jump_table_size + 4);
4817 }
4818 }
4819
4820 sreloc = htab->elf.srelgot;
4821
4822 outrel.r_offset = (htab->elf.sgot->output_section->vma
4823 + htab->elf.sgot->output_offset + off);
4824
4825 if (GOT_TLS_GD_P (tls_type))
4826 dr_type = R_386_TLS_DTPMOD32;
4827 else if (GOT_TLS_GDESC_P (tls_type))
4828 goto dr_done;
4829 else if (tls_type == GOT_TLS_IE_POS)
4830 dr_type = R_386_TLS_TPOFF;
4831 else
4832 dr_type = R_386_TLS_TPOFF32;
4833
4834 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4835 bfd_put_32 (output_bfd,
4836 relocation - elf_i386_dtpoff_base (info),
4837 htab->elf.sgot->contents + off);
4838 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4839 bfd_put_32 (output_bfd,
4840 elf_i386_dtpoff_base (info) - relocation,
4841 htab->elf.sgot->contents + off);
4842 else if (dr_type != R_386_TLS_DESC)
4843 bfd_put_32 (output_bfd, 0,
4844 htab->elf.sgot->contents + off);
4845 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4846
4847 elf_append_rel (output_bfd, sreloc, &outrel);
4848
4849 if (GOT_TLS_GD_P (tls_type))
4850 {
4851 if (indx == 0)
4852 {
4853 BFD_ASSERT (! unresolved_reloc);
4854 bfd_put_32 (output_bfd,
4855 relocation - elf_i386_dtpoff_base (info),
4856 htab->elf.sgot->contents + off + 4);
4857 }
4858 else
4859 {
4860 bfd_put_32 (output_bfd, 0,
4861 htab->elf.sgot->contents + off + 4);
4862 outrel.r_info = ELF32_R_INFO (indx,
4863 R_386_TLS_DTPOFF32);
4864 outrel.r_offset += 4;
4865 elf_append_rel (output_bfd, sreloc, &outrel);
4866 }
4867 }
4868 else if (tls_type == GOT_TLS_IE_BOTH)
4869 {
4870 bfd_put_32 (output_bfd,
4871 (indx == 0
4872 ? relocation - elf_i386_dtpoff_base (info)
4873 : 0),
4874 htab->elf.sgot->contents + off + 4);
4875 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4876 outrel.r_offset += 4;
4877 elf_append_rel (output_bfd, sreloc, &outrel);
4878 }
4879
4880 dr_done:
4881 if (h != NULL)
4882 h->got.offset |= 1;
4883 else
4884 local_got_offsets[r_symndx] |= 1;
4885 }
4886
4887 if (off >= (bfd_vma) -2
4888 && ! GOT_TLS_GDESC_P (tls_type))
4889 abort ();
4890 if (r_type == R_386_TLS_GOTDESC
4891 || r_type == R_386_TLS_DESC_CALL)
4892 {
4893 relocation = htab->sgotplt_jump_table_size + offplt;
4894 unresolved_reloc = FALSE;
4895 }
4896 else if (r_type == ELF32_R_TYPE (rel->r_info))
4897 {
4898 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4899 + htab->elf.sgotplt->output_offset;
4900 relocation = htab->elf.sgot->output_section->vma
4901 + htab->elf.sgot->output_offset + off - g_o_t;
4902 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4903 && tls_type == GOT_TLS_IE_BOTH)
4904 relocation += 4;
4905 if (r_type == R_386_TLS_IE)
4906 relocation += g_o_t;
4907 unresolved_reloc = FALSE;
4908 }
4909 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4910 {
4911 unsigned int val, type;
4912 bfd_vma roff;
4913
4914 /* GD->IE transition. */
4915 type = *(contents + rel->r_offset - 2);
4916 val = *(contents + rel->r_offset - 1);
4917 if (type == 0x04)
4918 {
4919 /* Change
4920 leal foo@tlsgd(,%ebx,1), %eax
4921 call ___tls_get_addr@PLT
4922 into:
4923 movl %gs:0, %eax
4924 subl $foo@gottpoff(%ebx), %eax. */
4925 val >>= 3;
4926 roff = rel->r_offset - 3;
4927 }
4928 else
4929 {
4930 /* Change
4931 leal foo@tlsgd(%ebx), %eax
4932 call ___tls_get_addr@PLT
4933 nop
4934 or
4935 leal foo@tlsgd(%reg), %eax
4936 call *___tls_get_addr@GOT(%reg)
4937 which may be converted to
4938 addr32 call ___tls_get_addr
4939 into:
4940 movl %gs:0, %eax;
4941 subl $foo@gottpoff(%reg), %eax. */
4942 roff = rel->r_offset - 2;
4943 }
4944 memcpy (contents + roff,
4945 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4946 contents[roff + 7] = 0x80 | (val & 7);
4947 /* If foo is used only with foo@gotntpoff(%reg) and
4948 foo@indntpoff, but not with foo@gottpoff(%reg), change
4949 subl $foo@gottpoff(%reg), %eax
4950 into:
4951 addl $foo@gotntpoff(%reg), %eax. */
4952 if (tls_type == GOT_TLS_IE_POS)
4953 contents[roff + 6] = 0x03;
4954 bfd_put_32 (output_bfd,
4955 htab->elf.sgot->output_section->vma
4956 + htab->elf.sgot->output_offset + off
4957 - htab->elf.sgotplt->output_section->vma
4958 - htab->elf.sgotplt->output_offset,
4959 contents + roff + 8);
4960 /* Skip R_386_PLT32 and R_386_GOT32X. */
4961 rel++;
4962 wrel++;
4963 continue;
4964 }
4965 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4966 {
4967 /* GDesc -> IE transition.
4968 It's originally something like:
4969 leal x@tlsdesc(%ebx), %eax
4970
4971 Change it to:
4972 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4973 or:
4974 movl x@gottpoff(%ebx), %eax # before negl %eax
4975
4976 Registers other than %eax may be set up here. */
4977
4978 bfd_vma roff;
4979
4980 /* First, make sure it's a leal adding ebx to a 32-bit
4981 offset into any register, although it's probably
4982 almost always going to be eax. */
4983 roff = rel->r_offset;
4984
4985 /* Now modify the instruction as appropriate. */
4986 /* To turn a leal into a movl in the form we use it, it
4987 suffices to change the first byte from 0x8d to 0x8b.
4988 aoliva FIXME: should we decide to keep the leal, all
4989 we have to do is remove the statement below, and
4990 adjust the relaxation of R_386_TLS_DESC_CALL. */
4991 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4992
4993 if (tls_type == GOT_TLS_IE_BOTH)
4994 off += 4;
4995
4996 bfd_put_32 (output_bfd,
4997 htab->elf.sgot->output_section->vma
4998 + htab->elf.sgot->output_offset + off
4999 - htab->elf.sgotplt->output_section->vma
5000 - htab->elf.sgotplt->output_offset,
5001 contents + roff);
5002 continue;
5003 }
5004 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
5005 {
5006 /* GDesc -> IE transition.
5007 It's originally:
5008 call *(%eax)
5009
5010 Change it to:
5011 xchg %ax,%ax
5012 or
5013 negl %eax
5014 depending on how we transformed the TLS_GOTDESC above.
5015 */
5016
5017 bfd_vma roff;
5018
5019 roff = rel->r_offset;
5020
5021 /* Now modify the instruction as appropriate. */
5022 if (tls_type != GOT_TLS_IE_NEG)
5023 {
5024 /* xchg %ax,%ax */
5025 bfd_put_8 (output_bfd, 0x66, contents + roff);
5026 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5027 }
5028 else
5029 {
5030 /* negl %eax */
5031 bfd_put_8 (output_bfd, 0xf7, contents + roff);
5032 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
5033 }
5034
5035 continue;
5036 }
5037 else
5038 BFD_ASSERT (FALSE);
5039 break;
5040
5041 case R_386_TLS_LDM:
5042 if (! elf_i386_tls_transition (info, input_bfd,
5043 input_section, contents,
5044 symtab_hdr, sym_hashes,
5045 &r_type, GOT_UNKNOWN, rel,
5046 relend, h, r_symndx, TRUE))
5047 return FALSE;
5048
5049 if (r_type != R_386_TLS_LDM)
5050 {
5051 /* LD->LE transition. Change
5052 leal foo@tlsldm(%ebx) %eax
5053 call ___tls_get_addr@PLT
5054 into:
5055 movl %gs:0, %eax
5056 nop
5057 leal 0(%esi,1), %esi
5058 or change
5059 leal foo@tlsldm(%reg) %eax
5060 call *___tls_get_addr@GOT(%reg)
5061 which may be converted to
5062 addr32 call ___tls_get_addr
5063 into:
5064 movl %gs:0, %eax
5065 leal 0(%esi), %esi */
5066 BFD_ASSERT (r_type == R_386_TLS_LE_32);
5067 if (*(contents + rel->r_offset + 4) == 0xff
5068 || *(contents + rel->r_offset + 4) == 0x67)
5069 memcpy (contents + rel->r_offset - 2,
5070 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
5071 else
5072 memcpy (contents + rel->r_offset - 2,
5073 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
5074 /* Skip R_386_PC32/R_386_PLT32. */
5075 rel++;
5076 wrel++;
5077 continue;
5078 }
5079
5080 if (htab->elf.sgot == NULL)
5081 abort ();
5082
5083 off = htab->tls_ldm_got.offset;
5084 if (off & 1)
5085 off &= ~1;
5086 else
5087 {
5088 Elf_Internal_Rela outrel;
5089
5090 if (htab->elf.srelgot == NULL)
5091 abort ();
5092
5093 outrel.r_offset = (htab->elf.sgot->output_section->vma
5094 + htab->elf.sgot->output_offset + off);
5095
5096 bfd_put_32 (output_bfd, 0,
5097 htab->elf.sgot->contents + off);
5098 bfd_put_32 (output_bfd, 0,
5099 htab->elf.sgot->contents + off + 4);
5100 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
5101 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5102 htab->tls_ldm_got.offset |= 1;
5103 }
5104 relocation = htab->elf.sgot->output_section->vma
5105 + htab->elf.sgot->output_offset + off
5106 - htab->elf.sgotplt->output_section->vma
5107 - htab->elf.sgotplt->output_offset;
5108 unresolved_reloc = FALSE;
5109 break;
5110
5111 case R_386_TLS_LDO_32:
5112 if (!bfd_link_executable (info)
5113 || (input_section->flags & SEC_CODE) == 0)
5114 relocation -= elf_i386_dtpoff_base (info);
5115 else
5116 /* When converting LDO to LE, we must negate. */
5117 relocation = -elf_i386_tpoff (info, relocation);
5118 break;
5119
5120 case R_386_TLS_LE_32:
5121 case R_386_TLS_LE:
5122 if (!bfd_link_executable (info))
5123 {
5124 Elf_Internal_Rela outrel;
5125 asection *sreloc;
5126
5127 outrel.r_offset = rel->r_offset
5128 + input_section->output_section->vma
5129 + input_section->output_offset;
5130 if (h != NULL && h->dynindx != -1)
5131 indx = h->dynindx;
5132 else
5133 indx = 0;
5134 if (r_type == R_386_TLS_LE_32)
5135 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5136 else
5137 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5138 sreloc = elf_section_data (input_section)->sreloc;
5139 if (sreloc == NULL)
5140 abort ();
5141 elf_append_rel (output_bfd, sreloc, &outrel);
5142 if (indx)
5143 continue;
5144 else if (r_type == R_386_TLS_LE_32)
5145 relocation = elf_i386_dtpoff_base (info) - relocation;
5146 else
5147 relocation -= elf_i386_dtpoff_base (info);
5148 }
5149 else if (r_type == R_386_TLS_LE_32)
5150 relocation = elf_i386_tpoff (info, relocation);
5151 else
5152 relocation = -elf_i386_tpoff (info, relocation);
5153 break;
5154
5155 default:
5156 break;
5157 }
5158
5159 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5160 because such sections are not SEC_ALLOC and thus ld.so will
5161 not process them. */
5162 if (unresolved_reloc
5163 && !((input_section->flags & SEC_DEBUGGING) != 0
5164 && h->def_dynamic)
5165 && _bfd_elf_section_offset (output_bfd, info, input_section,
5166 rel->r_offset) != (bfd_vma) -1)
5167 {
5168 _bfd_error_handler
5169 /* xgettext:c-format */
5170 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5171 input_bfd,
5172 input_section,
5173 (long) rel->r_offset,
5174 howto->name,
5175 h->root.root.string);
5176 return FALSE;
5177 }
5178
5179 do_relocation:
5180 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5181 contents, rel->r_offset,
5182 relocation, 0);
5183
5184 check_relocation_error:
5185 if (r != bfd_reloc_ok)
5186 {
5187 const char *name;
5188
5189 if (h != NULL)
5190 name = h->root.root.string;
5191 else
5192 {
5193 name = bfd_elf_string_from_elf_section (input_bfd,
5194 symtab_hdr->sh_link,
5195 sym->st_name);
5196 if (name == NULL)
5197 return FALSE;
5198 if (*name == '\0')
5199 name = bfd_section_name (input_bfd, sec);
5200 }
5201
5202 if (r == bfd_reloc_overflow)
5203 (*info->callbacks->reloc_overflow)
5204 (info, (h ? &h->root : NULL), name, howto->name,
5205 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5206 else
5207 {
5208 _bfd_error_handler
5209 /* xgettext:c-format */
5210 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5211 input_bfd, input_section,
5212 (long) rel->r_offset, name, (int) r);
5213 return FALSE;
5214 }
5215 }
5216
5217 if (wrel != rel)
5218 *wrel = *rel;
5219 }
5220
5221 if (wrel != rel)
5222 {
5223 Elf_Internal_Shdr *rel_hdr;
5224 size_t deleted = rel - wrel;
5225
5226 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5227 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5228 if (rel_hdr->sh_size == 0)
5229 {
5230 /* It is too late to remove an empty reloc section. Leave
5231 one NONE reloc.
5232 ??? What is wrong with an empty section??? */
5233 rel_hdr->sh_size = rel_hdr->sh_entsize;
5234 deleted -= 1;
5235 }
5236 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5237 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5238 input_section->reloc_count -= deleted;
5239 }
5240
5241 return TRUE;
5242 }
5243
5244 /* Finish up dynamic symbol handling. We set the contents of various
5245 dynamic sections here. */
5246
5247 static bfd_boolean
5248 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5249 struct bfd_link_info *info,
5250 struct elf_link_hash_entry *h,
5251 Elf_Internal_Sym *sym)
5252 {
5253 struct elf_i386_link_hash_table *htab;
5254 unsigned plt_entry_size;
5255 const struct elf_i386_backend_data *abed;
5256 struct elf_i386_link_hash_entry *eh;
5257 bfd_boolean local_undefweak;
5258
5259 htab = elf_i386_hash_table (info);
5260 if (htab == NULL)
5261 return FALSE;
5262
5263 abed = get_elf_i386_backend_data (output_bfd);
5264 plt_entry_size = htab->plt.plt_entry_size;
5265
5266 eh = (struct elf_i386_link_hash_entry *) h;
5267 if (eh->no_finish_dynamic_symbol)
5268 abort ();
5269
5270 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5271 resolved undefined weak symbols in executable so that their
5272 references have value 0 at run-time. */
5273 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5274 eh->has_got_reloc,
5275 eh);
5276
5277 if (h->plt.offset != (bfd_vma) -1)
5278 {
5279 bfd_vma plt_index;
5280 bfd_vma got_offset;
5281 Elf_Internal_Rela rel;
5282 bfd_byte *loc;
5283 asection *plt, *gotplt, *relplt;
5284
5285 /* When building a static executable, use .iplt, .igot.plt and
5286 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5287 if (htab->elf.splt != NULL)
5288 {
5289 plt = htab->elf.splt;
5290 gotplt = htab->elf.sgotplt;
5291 relplt = htab->elf.srelplt;
5292 }
5293 else
5294 {
5295 plt = htab->elf.iplt;
5296 gotplt = htab->elf.igotplt;
5297 relplt = htab->elf.irelplt;
5298 }
5299
5300 /* This symbol has an entry in the procedure linkage table. Set
5301 it up. */
5302
5303 if ((h->dynindx == -1
5304 && !local_undefweak
5305 && !((h->forced_local || bfd_link_executable (info))
5306 && h->def_regular
5307 && h->type == STT_GNU_IFUNC))
5308 || plt == NULL
5309 || gotplt == NULL
5310 || relplt == NULL)
5311 abort ();
5312
5313 /* Get the index in the procedure linkage table which
5314 corresponds to this symbol. This is the index of this symbol
5315 in all the symbols for which we are making plt entries. The
5316 first entry in the procedure linkage table is reserved.
5317
5318 Get the offset into the .got table of the entry that
5319 corresponds to this function. Each .got entry is 4 bytes.
5320 The first three are reserved.
5321
5322 For static executables, we don't reserve anything. */
5323
5324 if (plt == htab->elf.splt)
5325 {
5326 got_offset = (h->plt.offset / plt_entry_size
5327 - htab->plt.has_plt0);
5328 got_offset = (got_offset + 3) * 4;
5329 }
5330 else
5331 {
5332 got_offset = h->plt.offset / plt_entry_size;
5333 got_offset = got_offset * 4;
5334 }
5335
5336 /* Fill in the entry in the procedure linkage table and update
5337 the first slot. */
5338 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
5339 plt_entry_size);
5340 if (! bfd_link_pic (info))
5341 {
5342 bfd_put_32 (output_bfd,
5343 (gotplt->output_section->vma
5344 + gotplt->output_offset
5345 + got_offset),
5346 plt->contents + h->plt.offset
5347 + htab->plt.plt_got_offset);
5348
5349 if (abed->os == is_vxworks)
5350 {
5351 int s, k, reloc_index;
5352
5353 /* Create the R_386_32 relocation referencing the GOT
5354 for this PLT entry. */
5355
5356 /* S: Current slot number (zero-based). */
5357 s = ((h->plt.offset - htab->plt.plt_entry_size)
5358 / htab->plt.plt_entry_size);
5359 /* K: Number of relocations for PLTResolve. */
5360 if (bfd_link_pic (info))
5361 k = PLTRESOLVE_RELOCS_SHLIB;
5362 else
5363 k = PLTRESOLVE_RELOCS;
5364 /* Skip the PLTresolve relocations, and the relocations for
5365 the other PLT slots. */
5366 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5367 loc = (htab->srelplt2->contents + reloc_index
5368 * sizeof (Elf32_External_Rel));
5369
5370 rel.r_offset = (htab->elf.splt->output_section->vma
5371 + htab->elf.splt->output_offset
5372 + h->plt.offset + 2),
5373 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5374 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5375
5376 /* Create the R_386_32 relocation referencing the beginning of
5377 the PLT for this GOT entry. */
5378 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5379 + htab->elf.sgotplt->output_offset
5380 + got_offset);
5381 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5382 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5383 loc + sizeof (Elf32_External_Rel));
5384 }
5385 }
5386 else
5387 {
5388 bfd_put_32 (output_bfd, got_offset,
5389 plt->contents + h->plt.offset
5390 + htab->plt.plt_got_offset);
5391 }
5392
5393 /* Fill in the entry in the global offset table. Leave the entry
5394 as zero for undefined weak symbol in PIE. No PLT relocation
5395 against undefined weak symbol in PIE. */
5396 if (!local_undefweak)
5397 {
5398 if (htab->plt.has_plt0)
5399 bfd_put_32 (output_bfd,
5400 (plt->output_section->vma
5401 + plt->output_offset
5402 + h->plt.offset
5403 + htab->lazy_plt->plt_lazy_offset),
5404 gotplt->contents + got_offset);
5405
5406 /* Fill in the entry in the .rel.plt section. */
5407 rel.r_offset = (gotplt->output_section->vma
5408 + gotplt->output_offset
5409 + got_offset);
5410 if (h->dynindx == -1
5411 || ((bfd_link_executable (info)
5412 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5413 && h->def_regular
5414 && h->type == STT_GNU_IFUNC))
5415 {
5416 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5417 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5418 in the .got.plt section. */
5419 bfd_put_32 (output_bfd,
5420 (h->root.u.def.value
5421 + h->root.u.def.section->output_section->vma
5422 + h->root.u.def.section->output_offset),
5423 gotplt->contents + got_offset);
5424 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5425 /* R_386_IRELATIVE comes last. */
5426 plt_index = htab->next_irelative_index--;
5427 }
5428 else
5429 {
5430 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5431 plt_index = htab->next_jump_slot_index++;
5432 }
5433
5434 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5435 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5436
5437 /* Don't fill the second and third slots in PLT entry for
5438 static executables nor without PLT0. */
5439 if (plt == htab->elf.splt && htab->plt.has_plt0)
5440 {
5441 bfd_put_32 (output_bfd,
5442 plt_index * sizeof (Elf32_External_Rel),
5443 plt->contents + h->plt.offset
5444 + htab->lazy_plt->plt_reloc_offset);
5445 bfd_put_32 (output_bfd,
5446 - (h->plt.offset
5447 + htab->lazy_plt->plt_plt_offset + 4),
5448 (plt->contents + h->plt.offset
5449 + htab->lazy_plt->plt_plt_offset));
5450 }
5451 }
5452 }
5453 else if (eh->plt_got.offset != (bfd_vma) -1)
5454 {
5455 bfd_vma got_offset, plt_offset;
5456 asection *plt, *got, *gotplt;
5457 const bfd_byte *got_plt_entry;
5458
5459 /* Set the entry in the GOT procedure linkage table. */
5460 plt = htab->plt_got;
5461 got = htab->elf.sgot;
5462 gotplt = htab->elf.sgotplt;
5463 got_offset = h->got.offset;
5464
5465 if (got_offset == (bfd_vma) -1
5466 || plt == NULL
5467 || got == NULL
5468 || gotplt == NULL)
5469 abort ();
5470
5471 /* Fill in the entry in the GOT procedure linkage table. */
5472 if (! bfd_link_pic (info))
5473 {
5474 got_plt_entry = htab->non_lazy_plt->plt_entry;
5475 got_offset += got->output_section->vma + got->output_offset;
5476 }
5477 else
5478 {
5479 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
5480 got_offset += (got->output_section->vma
5481 + got->output_offset
5482 - gotplt->output_section->vma
5483 - gotplt->output_offset);
5484 }
5485
5486 plt_offset = eh->plt_got.offset;
5487 memcpy (plt->contents + plt_offset, got_plt_entry,
5488 htab->non_lazy_plt->plt_entry_size);
5489 bfd_put_32 (output_bfd, got_offset,
5490 (plt->contents + plt_offset
5491 + htab->non_lazy_plt->plt_got_offset));
5492 }
5493
5494 if (!local_undefweak
5495 && !h->def_regular
5496 && (h->plt.offset != (bfd_vma) -1
5497 || eh->plt_got.offset != (bfd_vma) -1))
5498 {
5499 /* Mark the symbol as undefined, rather than as defined in
5500 the .plt section. Leave the value if there were any
5501 relocations where pointer equality matters (this is a clue
5502 for the dynamic linker, to make function pointer
5503 comparisons work between an application and shared
5504 library), otherwise set it to zero. If a function is only
5505 called from a binary, there is no need to slow down
5506 shared libraries because of that. */
5507 sym->st_shndx = SHN_UNDEF;
5508 if (!h->pointer_equality_needed)
5509 sym->st_value = 0;
5510 }
5511
5512 /* Don't generate dynamic GOT relocation against undefined weak
5513 symbol in executable. */
5514 if (h->got.offset != (bfd_vma) -1
5515 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5516 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5517 && !local_undefweak)
5518 {
5519 Elf_Internal_Rela rel;
5520 asection *relgot = htab->elf.srelgot;
5521
5522 /* This symbol has an entry in the global offset table. Set it
5523 up. */
5524
5525 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5526 abort ();
5527
5528 rel.r_offset = (htab->elf.sgot->output_section->vma
5529 + htab->elf.sgot->output_offset
5530 + (h->got.offset & ~(bfd_vma) 1));
5531
5532 /* If this is a static link, or it is a -Bsymbolic link and the
5533 symbol is defined locally or was forced to be local because
5534 of a version file, we just want to emit a RELATIVE reloc.
5535 The entry in the global offset table will already have been
5536 initialized in the relocate_section function. */
5537 if (h->def_regular
5538 && h->type == STT_GNU_IFUNC)
5539 {
5540 if (h->plt.offset == (bfd_vma) -1)
5541 {
5542 /* STT_GNU_IFUNC is referenced without PLT. */
5543 if (htab->elf.splt == NULL)
5544 {
5545 /* use .rel[a].iplt section to store .got relocations
5546 in static executable. */
5547 relgot = htab->elf.irelplt;
5548 }
5549 if (SYMBOL_REFERENCES_LOCAL (info, h))
5550 {
5551 bfd_put_32 (output_bfd,
5552 (h->root.u.def.value
5553 + h->root.u.def.section->output_section->vma
5554 + h->root.u.def.section->output_offset),
5555 htab->elf.sgot->contents + h->got.offset);
5556 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5557 }
5558 else
5559 goto do_glob_dat;
5560 }
5561 else if (bfd_link_pic (info))
5562 {
5563 /* Generate R_386_GLOB_DAT. */
5564 goto do_glob_dat;
5565 }
5566 else
5567 {
5568 asection *plt;
5569
5570 if (!h->pointer_equality_needed)
5571 abort ();
5572
5573 /* For non-shared object, we can't use .got.plt, which
5574 contains the real function addres if we need pointer
5575 equality. We load the GOT entry with the PLT entry. */
5576 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5577 bfd_put_32 (output_bfd,
5578 (plt->output_section->vma
5579 + plt->output_offset + h->plt.offset),
5580 htab->elf.sgot->contents + h->got.offset);
5581 return TRUE;
5582 }
5583 }
5584 else if (bfd_link_pic (info)
5585 && SYMBOL_REFERENCES_LOCAL (info, h))
5586 {
5587 BFD_ASSERT((h->got.offset & 1) != 0);
5588 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5589 }
5590 else
5591 {
5592 BFD_ASSERT((h->got.offset & 1) == 0);
5593 do_glob_dat:
5594 bfd_put_32 (output_bfd, (bfd_vma) 0,
5595 htab->elf.sgot->contents + h->got.offset);
5596 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5597 }
5598
5599 elf_append_rel (output_bfd, relgot, &rel);
5600 }
5601
5602 if (h->needs_copy)
5603 {
5604 Elf_Internal_Rela rel;
5605 asection *s;
5606
5607 /* This symbol needs a copy reloc. Set it up. */
5608
5609 if (h->dynindx == -1
5610 || (h->root.type != bfd_link_hash_defined
5611 && h->root.type != bfd_link_hash_defweak)
5612 || htab->elf.srelbss == NULL
5613 || htab->elf.sreldynrelro == NULL)
5614 abort ();
5615
5616 rel.r_offset = (h->root.u.def.value
5617 + h->root.u.def.section->output_section->vma
5618 + h->root.u.def.section->output_offset);
5619 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5620 if (h->root.u.def.section == htab->elf.sdynrelro)
5621 s = htab->elf.sreldynrelro;
5622 else
5623 s = htab->elf.srelbss;
5624 elf_append_rel (output_bfd, s, &rel);
5625 }
5626
5627 return TRUE;
5628 }
5629
5630 /* Finish up local dynamic symbol handling. We set the contents of
5631 various dynamic sections here. */
5632
5633 static bfd_boolean
5634 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5635 {
5636 struct elf_link_hash_entry *h
5637 = (struct elf_link_hash_entry *) *slot;
5638 struct bfd_link_info *info
5639 = (struct bfd_link_info *) inf;
5640
5641 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5642 h, NULL);
5643 }
5644
5645 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5646 here since undefined weak symbol may not be dynamic and may not be
5647 called for elf_i386_finish_dynamic_symbol. */
5648
5649 static bfd_boolean
5650 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5651 void *inf)
5652 {
5653 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5654 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5655
5656 if (h->root.type != bfd_link_hash_undefweak
5657 || h->dynindx != -1)
5658 return TRUE;
5659
5660 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5661 info, h, NULL);
5662 }
5663
5664 /* Used to decide how to sort relocs in an optimal manner for the
5665 dynamic linker, before writing them out. */
5666
5667 static enum elf_reloc_type_class
5668 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5669 const asection *rel_sec ATTRIBUTE_UNUSED,
5670 const Elf_Internal_Rela *rela)
5671 {
5672 bfd *abfd = info->output_bfd;
5673 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5674 struct elf_link_hash_table *htab = elf_hash_table (info);
5675
5676 if (htab->dynsym != NULL
5677 && htab->dynsym->contents != NULL)
5678 {
5679 /* Check relocation against STT_GNU_IFUNC symbol if there are
5680 dynamic symbols. */
5681 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5682 if (r_symndx != STN_UNDEF)
5683 {
5684 Elf_Internal_Sym sym;
5685 if (!bed->s->swap_symbol_in (abfd,
5686 (htab->dynsym->contents
5687 + r_symndx * sizeof (Elf32_External_Sym)),
5688 0, &sym))
5689 abort ();
5690
5691 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5692 return reloc_class_ifunc;
5693 }
5694 }
5695
5696 switch (ELF32_R_TYPE (rela->r_info))
5697 {
5698 case R_386_IRELATIVE:
5699 return reloc_class_ifunc;
5700 case R_386_RELATIVE:
5701 return reloc_class_relative;
5702 case R_386_JUMP_SLOT:
5703 return reloc_class_plt;
5704 case R_386_COPY:
5705 return reloc_class_copy;
5706 default:
5707 return reloc_class_normal;
5708 }
5709 }
5710
5711 /* Finish up the dynamic sections. */
5712
5713 static bfd_boolean
5714 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5715 struct bfd_link_info *info)
5716 {
5717 struct elf_i386_link_hash_table *htab;
5718 bfd *dynobj;
5719 asection *sdyn;
5720 const struct elf_i386_backend_data *abed;
5721
5722 htab = elf_i386_hash_table (info);
5723 if (htab == NULL)
5724 return FALSE;
5725
5726 dynobj = htab->elf.dynobj;
5727 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5728 abed = get_elf_i386_backend_data (output_bfd);
5729
5730 if (htab->elf.dynamic_sections_created)
5731 {
5732 Elf32_External_Dyn *dyncon, *dynconend;
5733
5734 if (sdyn == NULL || htab->elf.sgot == NULL)
5735 abort ();
5736
5737 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5738 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5739 for (; dyncon < dynconend; dyncon++)
5740 {
5741 Elf_Internal_Dyn dyn;
5742 asection *s;
5743
5744 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5745
5746 switch (dyn.d_tag)
5747 {
5748 default:
5749 if (abed->os == is_vxworks
5750 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5751 break;
5752 continue;
5753
5754 case DT_PLTGOT:
5755 s = htab->elf.sgotplt;
5756 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5757 break;
5758
5759 case DT_JMPREL:
5760 s = htab->elf.srelplt;
5761 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5762 break;
5763
5764 case DT_PLTRELSZ:
5765 s = htab->elf.srelplt;
5766 dyn.d_un.d_val = s->size;
5767 break;
5768 }
5769
5770 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5771 }
5772
5773 if (htab->elf.splt && htab->elf.splt->size > 0)
5774 {
5775 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5776 really seem like the right value. */
5777 elf_section_data (htab->elf.splt->output_section)
5778 ->this_hdr.sh_entsize = 4;
5779
5780 if (htab->plt.has_plt0)
5781 {
5782 /* Fill in the special first entry in the procedure linkage
5783 table. */
5784 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
5785 htab->lazy_plt->plt0_entry_size);
5786 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
5787 abed->plt0_pad_byte,
5788 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
5789 if (!bfd_link_pic (info))
5790 {
5791 bfd_put_32 (output_bfd,
5792 (htab->elf.sgotplt->output_section->vma
5793 + htab->elf.sgotplt->output_offset
5794 + 4),
5795 htab->elf.splt->contents
5796 + htab->lazy_plt->plt0_got1_offset);
5797 bfd_put_32 (output_bfd,
5798 (htab->elf.sgotplt->output_section->vma
5799 + htab->elf.sgotplt->output_offset
5800 + 8),
5801 htab->elf.splt->contents
5802 + htab->lazy_plt->plt0_got2_offset);
5803
5804 if (abed->os == is_vxworks)
5805 {
5806 Elf_Internal_Rela rel;
5807 int num_plts = (htab->elf.splt->size
5808 / htab->plt.plt_entry_size) - 1;
5809 unsigned char *p;
5810
5811 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
5812 + 4. On IA32 we use REL relocations so the
5813 addend goes in the PLT directly. */
5814 rel.r_offset = (htab->elf.splt->output_section->vma
5815 + htab->elf.splt->output_offset
5816 + htab->lazy_plt->plt0_got1_offset);
5817 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
5818 R_386_32);
5819 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5820 htab->srelplt2->contents);
5821 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
5822 + 8. */
5823 rel.r_offset = (htab->elf.splt->output_section->vma
5824 + htab->elf.splt->output_offset
5825 + htab->lazy_plt->plt0_got2_offset);
5826 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
5827 R_386_32);
5828 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5829 htab->srelplt2->contents +
5830 sizeof (Elf32_External_Rel));
5831 /* Correct the .rel.plt.unloaded relocations. */
5832 p = htab->srelplt2->contents;
5833 if (bfd_link_pic (info))
5834 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5835 else
5836 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5837
5838 for (; num_plts; num_plts--)
5839 {
5840 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5841 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
5842 R_386_32);
5843 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5844 p += sizeof (Elf32_External_Rel);
5845
5846 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5847 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
5848 R_386_32);
5849 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5850 p += sizeof (Elf32_External_Rel);
5851 }
5852 }
5853 }
5854 }
5855 }
5856
5857 if (htab->plt_got != NULL && htab->plt_got->size > 0)
5858 elf_section_data (htab->plt_got->output_section)
5859 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5860 }
5861
5862 /* Fill in the first three entries in the global offset table. */
5863 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
5864 {
5865 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5866 {
5867 _bfd_error_handler
5868 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5869 return FALSE;
5870 }
5871
5872 bfd_put_32 (output_bfd,
5873 (sdyn == NULL ? 0
5874 : sdyn->output_section->vma + sdyn->output_offset),
5875 htab->elf.sgotplt->contents);
5876 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5877 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5878
5879 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5880 }
5881
5882 /* Adjust .eh_frame for .plt section. */
5883 if (htab->plt_eh_frame != NULL
5884 && htab->plt_eh_frame->contents != NULL)
5885 {
5886 if (htab->elf.splt != NULL
5887 && htab->elf.splt->size != 0
5888 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5889 && htab->elf.splt->output_section != NULL
5890 && htab->plt_eh_frame->output_section != NULL)
5891 {
5892 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5893 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5894 + htab->plt_eh_frame->output_offset
5895 + PLT_FDE_START_OFFSET;
5896 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5897 htab->plt_eh_frame->contents
5898 + PLT_FDE_START_OFFSET);
5899 }
5900 if (htab->plt_eh_frame->sec_info_type
5901 == SEC_INFO_TYPE_EH_FRAME)
5902 {
5903 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5904 htab->plt_eh_frame,
5905 htab->plt_eh_frame->contents))
5906 return FALSE;
5907 }
5908 }
5909
5910 /* Adjust .eh_frame for .plt.got section. */
5911 if (htab->plt_got_eh_frame != NULL
5912 && htab->plt_got_eh_frame->contents != NULL)
5913 {
5914 if (htab->plt_got != NULL
5915 && htab->plt_got->size != 0
5916 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
5917 && htab->plt_got->output_section != NULL
5918 && htab->plt_got_eh_frame->output_section != NULL)
5919 {
5920 bfd_vma plt_start = htab->plt_got->output_section->vma;
5921 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
5922 + htab->plt_got_eh_frame->output_offset
5923 + PLT_FDE_START_OFFSET;
5924 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5925 htab->plt_got_eh_frame->contents
5926 + PLT_FDE_START_OFFSET);
5927 }
5928 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5929 {
5930 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5931 htab->plt_got_eh_frame,
5932 htab->plt_got_eh_frame->contents))
5933 return FALSE;
5934 }
5935 }
5936
5937 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5938 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5939
5940 /* Fill PLT entries for undefined weak symbols in PIE. */
5941 if (bfd_link_pie (info))
5942 bfd_hash_traverse (&info->hash->table,
5943 elf_i386_pie_finish_undefweak_symbol,
5944 info);
5945
5946 return TRUE;
5947 }
5948
5949 /* Fill PLT/GOT entries and allocate dynamic relocations for local
5950 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
5951 It has to be done before elf_link_sort_relocs is called so that
5952 dynamic relocations are properly sorted. */
5953
5954 static bfd_boolean
5955 elf_i386_output_arch_local_syms
5956 (bfd *output_bfd ATTRIBUTE_UNUSED,
5957 struct bfd_link_info *info,
5958 void *flaginfo ATTRIBUTE_UNUSED,
5959 int (*func) (void *, const char *,
5960 Elf_Internal_Sym *,
5961 asection *,
5962 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
5963 {
5964 struct elf_i386_link_hash_table *htab = elf_i386_hash_table (info);
5965 if (htab == NULL)
5966 return FALSE;
5967
5968 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5969 htab_traverse (htab->loc_hash_table,
5970 elf_i386_finish_local_dynamic_symbol,
5971 info);
5972
5973 return TRUE;
5974 }
5975
5976 /* Sort relocs into address order. */
5977
5978 static int
5979 compare_relocs (const void *ap, const void *bp)
5980 {
5981 const arelent *a = * (const arelent **) ap;
5982 const arelent *b = * (const arelent **) bp;
5983
5984 if (a->address > b->address)
5985 return 1;
5986 else if (a->address < b->address)
5987 return -1;
5988 else
5989 return 0;
5990 }
5991
5992 enum elf_i386_plt_type
5993 {
5994 plt_non_lazy = 0,
5995 plt_lazy = 1 << 0,
5996 plt_pic = 1 << 1,
5997 plt_unknown = -1
5998 };
5999
6000 struct elf_i386_plt
6001 {
6002 const char *name;
6003 asection *sec;
6004 bfd_byte *contents;
6005 enum elf_i386_plt_type type;
6006 unsigned int plt_got_offset;
6007 unsigned int plt_entry_size;
6008 long count;
6009 };
6010
6011 /* Forward declaration. */
6012 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt;
6013
6014 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
6015 dynamic relocations. */
6016
6017 static long
6018 elf_i386_get_synthetic_symtab (bfd *abfd,
6019 long symcount ATTRIBUTE_UNUSED,
6020 asymbol **syms ATTRIBUTE_UNUSED,
6021 long dynsymcount,
6022 asymbol **dynsyms,
6023 asymbol **ret)
6024 {
6025 long size, count, i, n;
6026 int j;
6027 unsigned int plt_got_offset, plt_entry_size;
6028 asymbol *s;
6029 bfd_byte *plt_contents;
6030 long dynrelcount, relsize;
6031 arelent **dynrelbuf;
6032 const struct elf_i386_lazy_plt_layout *lazy_plt;
6033 const struct elf_i386_non_lazy_plt_layout *non_lazy_plt;
6034 asection *plt;
6035 bfd_vma got_addr;
6036 char *names;
6037 enum elf_i386_plt_type plt_type;
6038 struct elf_i386_plt plts[] =
6039 {
6040 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0 },
6041 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0 },
6042 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0 }
6043 };
6044
6045 *ret = NULL;
6046
6047 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
6048 return 0;
6049
6050 if (dynsymcount <= 0)
6051 return 0;
6052
6053 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
6054 if (relsize <= 0)
6055 return -1;
6056
6057 dynrelbuf = (arelent **) bfd_malloc (relsize);
6058 if (dynrelbuf == NULL)
6059 return -1;
6060
6061 dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
6062 dynsyms);
6063
6064 /* Sort the relocs by address. */
6065 qsort (dynrelbuf, dynrelcount, sizeof (arelent *), compare_relocs);
6066
6067 non_lazy_plt = NULL;
6068 /* Silence GCC 6. */
6069 lazy_plt = NULL;
6070 switch (get_elf_i386_backend_data (abfd)->os)
6071 {
6072 case is_normal:
6073 non_lazy_plt = &elf_i386_non_lazy_plt;
6074 /* Fall through */
6075 case is_vxworks:
6076 lazy_plt = &elf_i386_lazy_plt;
6077 break;
6078 case is_nacl:
6079 lazy_plt = &elf_i386_nacl_plt;
6080 break;
6081 }
6082
6083 got_addr = 0;
6084
6085 count = 0;
6086 for (j = 0; plts[j].name != NULL; j++)
6087 {
6088 plt = bfd_get_section_by_name (abfd, plts[j].name);
6089 if (plt == NULL)
6090 continue;
6091
6092 /* Get the PLT section contents. */
6093 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6094 if (plt_contents == NULL)
6095 break;
6096 if (!bfd_get_section_contents (abfd, (asection *) plt,
6097 plt_contents, 0, plt->size))
6098 {
6099 free (plt_contents);
6100 break;
6101 }
6102
6103 /* Check what kind of PLT it is. */
6104 plt_type = plt_unknown;
6105 if (plts[j].type == plt_unknown)
6106 {
6107 /* Match lazy PLT first. */
6108 if (memcmp (plt_contents, lazy_plt->plt0_entry,
6109 lazy_plt->plt0_got1_offset) == 0)
6110 plt_type = plt_lazy;
6111 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
6112 lazy_plt->plt0_got1_offset) == 0)
6113 plt_type = plt_lazy | plt_pic;
6114 }
6115
6116 if (non_lazy_plt != NULL
6117 && (plt_type == plt_unknown || plt_type == plt_non_lazy))
6118 {
6119 /* Match non-lazy PLT. */
6120 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
6121 non_lazy_plt->plt_got_offset) == 0)
6122 plt_type = plt_non_lazy;
6123 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
6124 non_lazy_plt->plt_got_offset) == 0)
6125 plt_type = plt_pic;
6126 }
6127
6128 if (plt_type == plt_unknown)
6129 continue;
6130
6131 plts[j].sec = plt;
6132 plts[j].type = plt_type;
6133
6134 if ((plt_type & plt_lazy))
6135 {
6136 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
6137 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
6138 /* Skip PLT0 in lazy PLT. */
6139 i = 1;
6140 }
6141 else
6142 {
6143 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
6144 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
6145 i = 0;
6146 }
6147
6148 n = plt->size / plts[j].plt_entry_size;
6149 plts[j].count = n;
6150 count += n - i;
6151
6152 plts[j].contents = plt_contents;
6153
6154 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
6155 if ((plt_type & plt_pic))
6156 got_addr = (bfd_vma) -1;
6157 }
6158
6159 size = count * sizeof (asymbol);
6160 s = *ret = (asymbol *) bfd_zmalloc (size);
6161 if (s == NULL)
6162 {
6163 bad_return:
6164 for (j = 0; plts[j].name != NULL; j++)
6165 if (plts[j].contents != NULL)
6166 free (plts[j].contents);
6167 free (dynrelbuf);
6168 return -1;
6169 }
6170
6171 if (got_addr)
6172 {
6173 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
6174 address. */
6175 asection *sec = bfd_get_section_by_name (abfd, ".got.plt");
6176 if (sec != NULL)
6177 got_addr = sec->vma;
6178 else
6179 {
6180 sec = bfd_get_section_by_name (abfd, ".got");
6181 if (sec != NULL)
6182 got_addr = sec->vma;
6183 }
6184
6185 if (got_addr == (bfd_vma) -1)
6186 goto bad_return;
6187 }
6188
6189 /* Check for each PLT section. */
6190 size = 0;
6191 n = 0;
6192 for (j = 0; plts[j].name != NULL; j++)
6193 if ((plt_contents = plts[j].contents) != NULL)
6194 {
6195 long k;
6196 bfd_vma offset;
6197
6198 plt_got_offset = plts[j].plt_got_offset;
6199 plt_entry_size = plts[j].plt_entry_size;
6200
6201 plt = plts[j].sec;
6202
6203 if ((plts[j].type & plt_lazy))
6204 {
6205 /* Skip PLT0 in lazy PLT. */
6206 k = 1;
6207 offset = plt_entry_size;
6208 }
6209 else
6210 {
6211 k = 0;
6212 offset = 0;
6213 }
6214
6215 /* Check each PLT entry against dynamic relocations. */
6216 for (; k < plts[j].count; k++)
6217 {
6218 int off;
6219 bfd_vma got_vma;
6220 long min, max, mid;
6221 arelent *p;
6222
6223 /* Get the GOT offset, a signed 32-bit integer. */
6224 off = H_GET_32 (abfd, (plt_contents + offset
6225 + plt_got_offset));
6226 got_vma = got_addr + off;
6227
6228 /* Binary search. */
6229 p = dynrelbuf[0];
6230 min = 0;
6231 max = dynrelcount;
6232 while ((min + 1) < max)
6233 {
6234 arelent *r;
6235
6236 mid = (min + max) / 2;
6237 r = dynrelbuf[mid];
6238 if (got_vma > r->address)
6239 min = mid;
6240 else if (got_vma < r->address)
6241 max = mid;
6242 else
6243 {
6244 p = r;
6245 break;
6246 }
6247 }
6248
6249 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
6250 if (got_vma == p->address
6251 && p->howto != NULL
6252 && (p->howto->type == R_386_JUMP_SLOT
6253 || p->howto->type == R_386_GLOB_DAT
6254 || p->howto->type == R_386_IRELATIVE))
6255 {
6256 *s = **p->sym_ptr_ptr;
6257 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
6258 set. Since we are defining a symbol, ensure one
6259 of them is set. */
6260 if ((s->flags & BSF_LOCAL) == 0)
6261 s->flags |= BSF_GLOBAL;
6262 s->flags |= BSF_SYNTHETIC;
6263 /* This is no longer a section symbol. */
6264 s->flags &= ~BSF_SECTION_SYM;
6265 s->section = plt;
6266 s->the_bfd = plt->owner;
6267 s->value = offset;
6268 /* Store relocation for later use. */
6269 s->udata.p = p;
6270 /* Add @plt to function name later. */
6271 size += strlen (s->name) + sizeof ("@plt");
6272 if (p->addend != 0)
6273 size += sizeof ("+0x") - 1 + 8;
6274 n++;
6275 s++;
6276 }
6277 offset += plt_entry_size;
6278 }
6279 }
6280
6281 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
6282 if (n == 0)
6283 goto bad_return;
6284
6285 count = n;
6286
6287 /* Allocate space for @plt suffixes. */
6288 names = (char *) bfd_malloc (size);
6289 if (s == NULL)
6290 goto bad_return;
6291
6292 s = *ret;
6293 for (i = 0; i < count; i++)
6294 {
6295 /* Add @plt to function name. */
6296 arelent *p = (arelent *) s->udata.p;
6297 /* Clear it now. */
6298 s->udata.p = NULL;
6299 size = strlen (s->name);
6300 memcpy (names, s->name, size);
6301 s->name = names;
6302 names += size;
6303 if (p->addend != 0)
6304 {
6305 char buf[30], *a;
6306
6307 memcpy (names, "+0x", sizeof ("+0x") - 1);
6308 names += sizeof ("+0x") - 1;
6309 bfd_sprintf_vma (abfd, buf, p->addend);
6310 for (a = buf; *a == '0'; ++a)
6311 ;
6312 size = strlen (a);
6313 memcpy (names, a, size);
6314 names += size;
6315 }
6316 memcpy (names, "@plt", sizeof ("@plt"));
6317 names += sizeof ("@plt");
6318 s++;
6319 }
6320
6321 for (j = 0; plts[j].name != NULL; j++)
6322 if (plts[j].contents != NULL)
6323 free (plts[j].contents);
6324
6325 free (dynrelbuf);
6326
6327 return count;
6328 }
6329
6330 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6331
6332 static bfd_boolean
6333 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
6334 {
6335 if (h->plt.offset != (bfd_vma) -1
6336 && !h->def_regular
6337 && !h->pointer_equality_needed)
6338 return FALSE;
6339
6340 return _bfd_elf_hash_symbol (h);
6341 }
6342
6343 /* Parse i386 GNU properties. */
6344
6345 static enum elf_property_kind
6346 elf_i386_parse_gnu_properties (bfd *abfd, unsigned int type,
6347 bfd_byte *ptr, unsigned int datasz)
6348 {
6349 elf_property *prop;
6350
6351 switch (type)
6352 {
6353 case GNU_PROPERTY_X86_ISA_1_USED:
6354 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6355 if (datasz != 4)
6356 {
6357 _bfd_error_handler
6358 ((type == GNU_PROPERTY_X86_ISA_1_USED
6359 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6360 : _("error: %B: <corrupt x86 ISA needed size: 0x%x>")),
6361 abfd, datasz);
6362 return property_corrupt;
6363 }
6364 prop = _bfd_elf_get_property (abfd, type, datasz);
6365 prop->u.number = bfd_h_get_32 (abfd, ptr);
6366 prop->pr_kind = property_number;
6367 break;
6368
6369 default:
6370 return property_ignored;
6371 }
6372
6373 return property_number;
6374 }
6375
6376 /* Merge i386 GNU property BPROP with APROP. If APROP isn't NULL,
6377 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6378 should be merged with ABFD. */
6379
6380 static bfd_boolean
6381 elf_i386_merge_gnu_properties (bfd *abfd ATTRIBUTE_UNUSED,
6382 elf_property *aprop,
6383 elf_property *bprop)
6384 {
6385 unsigned int number;
6386 bfd_boolean updated = FALSE;
6387 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
6388
6389 switch (pr_type)
6390 {
6391 case GNU_PROPERTY_X86_ISA_1_USED:
6392 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6393 if (aprop != NULL && bprop != NULL)
6394 {
6395 number = aprop->u.number;
6396 aprop->u.number = number | bprop->u.number;
6397 updated = number != (unsigned int) aprop->u.number;
6398 }
6399 else
6400 {
6401 /* Return TRUE if APROP is NULL to indicate that BPROP should
6402 be added to ABFD. */
6403 updated = aprop == NULL;
6404 }
6405 break;
6406
6407 default:
6408 /* Never should happen. */
6409 abort ();
6410 }
6411
6412 return updated;
6413 }
6414
6415 /* Set up i386 GNU properties. Return the first relocatable ELF input
6416 with GNU properties if found. Otherwise, return NULL. */
6417
6418 static bfd *
6419 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
6420 {
6421 bfd_boolean normal_target;
6422 asection *sec, *pltsec;
6423 bfd *dynobj;
6424 unsigned int plt_alignment;
6425 struct elf_i386_link_hash_table *htab;
6426 bfd *pbfd = _bfd_elf_link_setup_gnu_properties (info);
6427
6428 if (bfd_link_relocatable (info))
6429 return pbfd;
6430
6431 htab = elf_i386_hash_table (info);
6432 if (htab == NULL)
6433 return pbfd;
6434
6435 dynobj = htab->elf.dynobj;
6436
6437 /* Set htab->elf.dynobj here so that there is no need to check and
6438 set it in check_relocs. */
6439 if (dynobj == NULL)
6440 {
6441 bfd *abfd;
6442
6443 /* Find a normal input file to hold linker created
6444 sections. */
6445 for (abfd = info->input_bfds;
6446 abfd != NULL;
6447 abfd = abfd->link.next)
6448 if ((abfd->flags
6449 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
6450 {
6451 htab->elf.dynobj = abfd;
6452 dynobj = abfd;
6453 break;
6454 }
6455 }
6456
6457 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
6458 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
6459 canonical function address. */
6460 htab->plt.has_plt0 = 1;
6461 normal_target = FALSE;
6462
6463 switch (get_elf_i386_backend_data (info->output_bfd)->os)
6464 {
6465 case is_normal:
6466 htab->lazy_plt = &elf_i386_lazy_plt;
6467 htab->non_lazy_plt = &elf_i386_non_lazy_plt;
6468 normal_target = TRUE;
6469 break;
6470 case is_vxworks:
6471 htab->lazy_plt = &elf_i386_lazy_plt;
6472 htab->non_lazy_plt = NULL;
6473 if (!elf_vxworks_create_dynamic_sections (dynobj, info,
6474 &htab->srelplt2))
6475 info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
6476 break;
6477 case is_nacl:
6478 htab->lazy_plt = &elf_i386_nacl_plt;
6479 htab->non_lazy_plt = NULL;
6480 break;
6481 }
6482
6483 pltsec = htab->elf.splt;
6484
6485 /* If the non-lazy PLT is available, use it for all PLT entries if
6486 there are no PLT0 or no .plt section. */
6487 if (htab->non_lazy_plt != NULL
6488 && (!htab->plt.has_plt0 || pltsec == NULL))
6489 {
6490 if (bfd_link_pic (info))
6491 htab->plt.plt_entry
6492 = htab->non_lazy_plt->pic_plt_entry;
6493 else
6494 htab->plt.plt_entry
6495 = htab->non_lazy_plt->plt_entry;
6496 htab->plt.plt_entry_size
6497 = htab->non_lazy_plt->plt_entry_size;
6498 htab->plt.plt_got_offset
6499 = htab->non_lazy_plt->plt_got_offset;
6500 htab->plt.eh_frame_plt_size
6501 = htab->non_lazy_plt->eh_frame_plt_size;
6502 htab->plt.eh_frame_plt
6503 = htab->non_lazy_plt->eh_frame_plt;
6504 }
6505 else
6506 {
6507 if (bfd_link_pic (info))
6508 {
6509 htab->plt.plt0_entry
6510 = htab->lazy_plt->pic_plt0_entry;
6511 htab->plt.plt_entry
6512 = htab->lazy_plt->pic_plt_entry;
6513 }
6514 else
6515 {
6516 htab->plt.plt0_entry
6517 = htab->lazy_plt->plt0_entry;
6518 htab->plt.plt_entry
6519 = htab->lazy_plt->plt_entry;
6520 }
6521 htab->plt.plt_entry_size
6522 = htab->lazy_plt->plt_entry_size;
6523 htab->plt.plt_got_offset
6524 = htab->lazy_plt->plt_got_offset;
6525 htab->plt.eh_frame_plt_size
6526 = htab->lazy_plt->eh_frame_plt_size;
6527 htab->plt.eh_frame_plt
6528 = htab->lazy_plt->eh_frame_plt;
6529 }
6530
6531 /* Return if there are no normal input files. */
6532 if (dynobj == NULL)
6533 return pbfd;
6534
6535 /* Since create_dynamic_sections isn't always called, but GOT
6536 relocations need GOT relocations, create them here so that we
6537 don't need to do it in check_relocs. */
6538 if (htab->elf.sgot == NULL
6539 && !_bfd_elf_create_got_section (dynobj, info))
6540 info->callbacks->einfo (_("%F: failed to create GOT sections\n"));
6541
6542 /* Create the ifunc sections here so that check_relocs can be
6543 simplified. */
6544 if (!_bfd_elf_create_ifunc_sections (dynobj, info))
6545 info->callbacks->einfo (_("%F: failed to create ifunc sections\n"));
6546
6547 plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
6548
6549 if (pltsec != NULL)
6550 {
6551 /* Whe creating executable, set the contents of the .interp
6552 section to the interpreter. */
6553 if (bfd_link_executable (info) && !info->nointerp)
6554 {
6555 asection *s = bfd_get_linker_section (dynobj, ".interp");
6556 if (s == NULL)
6557 abort ();
6558 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
6559 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
6560 htab->interp = s;
6561 }
6562
6563 /* Don't change PLT section alignment for NaCl since it uses
6564 64-byte PLT entry and sets PLT section alignment to 32
6565 bytes. */
6566 if (normal_target)
6567 {
6568 const struct elf_backend_data *bed
6569 = get_elf_backend_data (dynobj);
6570 flagword pltflags = (bed->dynamic_sec_flags
6571 | SEC_ALLOC
6572 | SEC_CODE
6573 | SEC_LOAD
6574 | SEC_READONLY);
6575 unsigned int non_lazy_plt_alignment
6576 = bfd_log2 (htab->non_lazy_plt->plt_entry_size);
6577
6578 sec = pltsec;
6579 if (!bfd_set_section_alignment (sec->owner, sec,
6580 plt_alignment))
6581 goto error_alignment;
6582
6583 /* Create the GOT procedure linkage table. */
6584 sec = bfd_make_section_anyway_with_flags (dynobj,
6585 ".plt.got",
6586 pltflags);
6587 if (sec == NULL)
6588 info->callbacks->einfo (_("%F: failed to create GOT PLT section\n"));
6589
6590 if (!bfd_set_section_alignment (dynobj, sec,
6591 non_lazy_plt_alignment))
6592 goto error_alignment;
6593
6594 htab->plt_got = sec;
6595 }
6596
6597 if (!info->no_ld_generated_unwind_info)
6598 {
6599 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
6600 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
6601 | SEC_LINKER_CREATED);
6602
6603 sec = bfd_make_section_anyway_with_flags (dynobj,
6604 ".eh_frame",
6605 flags);
6606 if (sec == NULL)
6607 info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n"));
6608
6609 if (!bfd_set_section_alignment (dynobj, sec, 2))
6610 goto error_alignment;
6611
6612 htab->plt_eh_frame = sec;
6613
6614 if (htab->plt_got != NULL)
6615 {
6616 sec = bfd_make_section_anyway_with_flags (dynobj,
6617 ".eh_frame",
6618 flags);
6619 if (sec == NULL)
6620 info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
6621
6622 if (!bfd_set_section_alignment (dynobj, sec, 2))
6623 goto error_alignment;
6624
6625 htab->plt_got_eh_frame = sec;
6626 }
6627 }
6628 }
6629
6630 if (normal_target)
6631 {
6632 /* The .iplt section is used for IFUNC symbols in static
6633 executables. */
6634 sec = htab->elf.iplt;
6635 if (sec != NULL
6636 && !bfd_set_section_alignment (sec->owner, sec,
6637 plt_alignment))
6638 {
6639 error_alignment:
6640 info->callbacks->einfo (_("%F%A: failed to align section\n"),
6641 sec);
6642 }
6643 }
6644
6645 return pbfd;
6646 }
6647
6648 #define TARGET_LITTLE_SYM i386_elf32_vec
6649 #define TARGET_LITTLE_NAME "elf32-i386"
6650 #define ELF_ARCH bfd_arch_i386
6651 #define ELF_TARGET_ID I386_ELF_DATA
6652 #define ELF_MACHINE_CODE EM_386
6653 #define ELF_MAXPAGESIZE 0x1000
6654
6655 #define elf_backend_can_gc_sections 1
6656 #define elf_backend_can_refcount 1
6657 #define elf_backend_want_got_plt 1
6658 #define elf_backend_plt_readonly 1
6659 #define elf_backend_want_plt_sym 0
6660 #define elf_backend_got_header_size 12
6661 #define elf_backend_plt_alignment 4
6662 #define elf_backend_dtrel_excludes_plt 1
6663 #define elf_backend_extern_protected_data 1
6664 #define elf_backend_caches_rawsize 1
6665 #define elf_backend_want_dynrelro 1
6666
6667 /* Support RELA for objdump of prelink objects. */
6668 #define elf_info_to_howto elf_i386_info_to_howto_rel
6669 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
6670
6671 #define bfd_elf32_mkobject elf_i386_mkobject
6672
6673 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
6674 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
6675 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
6676 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
6677 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
6678
6679 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
6680 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
6681 #define elf_backend_check_relocs elf_i386_check_relocs
6682 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
6683 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
6684 #define elf_backend_fake_sections elf_i386_fake_sections
6685 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
6686 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
6687 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
6688 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
6689 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
6690 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
6691 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
6692 #define elf_backend_relocate_section elf_i386_relocate_section
6693 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
6694 #define elf_backend_always_size_sections elf_i386_always_size_sections
6695 #define elf_backend_omit_section_dynsym \
6696 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6697 #define elf_backend_hash_symbol elf_i386_hash_symbol
6698 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
6699 #define elf_backend_parse_gnu_properties elf_i386_parse_gnu_properties
6700 #define elf_backend_merge_gnu_properties elf_i386_merge_gnu_properties
6701 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
6702
6703 #include "elf32-target.h"
6704
6705 /* FreeBSD support. */
6706
6707 #undef TARGET_LITTLE_SYM
6708 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
6709 #undef TARGET_LITTLE_NAME
6710 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
6711 #undef ELF_OSABI
6712 #define ELF_OSABI ELFOSABI_FREEBSD
6713
6714 /* The kernel recognizes executables as valid only if they carry a
6715 "FreeBSD" label in the ELF header. So we put this label on all
6716 executables and (for simplicity) also all other object files. */
6717
6718 static void
6719 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
6720 {
6721 _bfd_elf_post_process_headers (abfd, info);
6722
6723 #ifdef OLD_FREEBSD_ABI_LABEL
6724 {
6725 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6726 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6727 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6728 }
6729 #endif
6730 }
6731
6732 #undef elf_backend_post_process_headers
6733 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6734 #undef elf32_bed
6735 #define elf32_bed elf32_i386_fbsd_bed
6736
6737 #undef elf_backend_add_symbol_hook
6738
6739 #include "elf32-target.h"
6740
6741 /* Solaris 2. */
6742
6743 #undef TARGET_LITTLE_SYM
6744 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6745 #undef TARGET_LITTLE_NAME
6746 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
6747
6748 #undef elf_backend_post_process_headers
6749
6750 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6751 objects won't be recognized. */
6752 #undef ELF_OSABI
6753
6754 #undef elf32_bed
6755 #define elf32_bed elf32_i386_sol2_bed
6756
6757 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6758 boundary. */
6759 #undef elf_backend_static_tls_alignment
6760 #define elf_backend_static_tls_alignment 8
6761
6762 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6763
6764 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6765 File, p.63. */
6766 #undef elf_backend_want_plt_sym
6767 #define elf_backend_want_plt_sym 1
6768
6769 #undef elf_backend_strtab_flags
6770 #define elf_backend_strtab_flags SHF_STRINGS
6771
6772 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
6773 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
6774 FALSE otherwise. ISECTION is the best guess matching section from the
6775 input bfd IBFD, but it might be NULL. */
6776
6777 static bfd_boolean
6778 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6779 bfd *obfd ATTRIBUTE_UNUSED,
6780 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6781 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6782 {
6783 /* PR 19938: FIXME: Need to add code for setting the sh_info
6784 and sh_link fields of Solaris specific section types. */
6785 return FALSE;
6786
6787 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
6788 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
6789
6790 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
6791
6792 The following values should be set:
6793
6794 Type Link Info
6795 -----------------------------------------------------------------------------
6796 SHT_SUNW_ancillary The section header index of 0
6797 [0x6fffffee] the associated string table.
6798
6799 SHT_SUNW_capinfo The section header index of For a dynamic object, the
6800 [0x6ffffff0] the associated symbol table. section header index of
6801 the associated
6802 SHT_SUNW_capchain table,
6803 otherwise 0.
6804
6805 SHT_SUNW_symsort The section header index of 0
6806 [0x6ffffff1] the associated symbol table.
6807
6808 SHT_SUNW_tlssort The section header index of 0
6809 [0x6ffffff2] the associated symbol table.
6810
6811 SHT_SUNW_LDYNSYM The section header index of One greater than the
6812 [0x6ffffff3] the associated string table. symbol table index of the
6813 This index is the same string last local symbol,
6814 table used by the SHT_DYNSYM STB_LOCAL. Since
6815 section. SHT_SUNW_LDYNSYM only
6816 contains local symbols,
6817 sh_info is equivalent to
6818 the number of symbols in
6819 the table.
6820
6821 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
6822 [0x6ffffff5] the section header index of to named strings, the
6823 the associated section header index of
6824 SHT_SUNW_capinfo table, the associated string
6825 otherwise 0. table, otherwise 0.
6826
6827 SHT_SUNW_move The section header index of 0
6828 [0x6ffffffa] the associated symbol table.
6829
6830 SHT_SUNW_COMDAT 0 0
6831 [0x6ffffffb]
6832
6833 SHT_SUNW_syminfo The section header index of The section header index
6834 [0x6ffffffc] the associated symbol table. of the associated
6835 .dynamic section.
6836
6837 SHT_SUNW_verdef The section header index of The number of version
6838 [0x6ffffffd] the associated string table. definitions within the
6839 section.
6840
6841 SHT_SUNW_verneed The section header index of The number of version
6842 [0x6ffffffe] the associated string table. dependencies within the
6843 section.
6844
6845 SHT_SUNW_versym The section header index of 0
6846 [0x6fffffff] the associated symbol table. */
6847 }
6848
6849 #undef elf_backend_copy_special_section_fields
6850 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
6851
6852 #include "elf32-target.h"
6853
6854 /* Intel MCU support. */
6855
6856 static bfd_boolean
6857 elf32_iamcu_elf_object_p (bfd *abfd)
6858 {
6859 /* Set the right machine number for an IAMCU elf32 file. */
6860 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6861 return TRUE;
6862 }
6863
6864 #undef TARGET_LITTLE_SYM
6865 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6866 #undef TARGET_LITTLE_NAME
6867 #define TARGET_LITTLE_NAME "elf32-iamcu"
6868 #undef ELF_ARCH
6869 #define ELF_ARCH bfd_arch_iamcu
6870
6871 #undef ELF_MACHINE_CODE
6872 #define ELF_MACHINE_CODE EM_IAMCU
6873
6874 #undef ELF_OSABI
6875
6876 #undef elf32_bed
6877 #define elf32_bed elf32_iamcu_bed
6878
6879 #undef elf_backend_object_p
6880 #define elf_backend_object_p elf32_iamcu_elf_object_p
6881
6882 #undef elf_backend_static_tls_alignment
6883
6884 #undef elf_backend_want_plt_sym
6885 #define elf_backend_want_plt_sym 0
6886
6887 #undef elf_backend_strtab_flags
6888 #undef elf_backend_copy_special_section_fields
6889
6890 #include "elf32-target.h"
6891
6892 /* Restore defaults. */
6893 #undef ELF_ARCH
6894 #define ELF_ARCH bfd_arch_i386
6895 #undef ELF_MACHINE_CODE
6896 #define ELF_MACHINE_CODE EM_386
6897
6898 /* Native Client support. */
6899
6900 #undef TARGET_LITTLE_SYM
6901 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6902 #undef TARGET_LITTLE_NAME
6903 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6904 #undef elf32_bed
6905 #define elf32_bed elf32_i386_nacl_bed
6906
6907 #undef ELF_MAXPAGESIZE
6908 #define ELF_MAXPAGESIZE 0x10000
6909
6910 /* Restore defaults. */
6911 #undef ELF_OSABI
6912 #undef elf_backend_want_plt_sym
6913 #define elf_backend_want_plt_sym 0
6914 #undef elf_backend_post_process_headers
6915 #undef elf_backend_static_tls_alignment
6916
6917 /* NaCl uses substantially different PLT entries for the same effects. */
6918
6919 #undef elf_backend_plt_alignment
6920 #define elf_backend_plt_alignment 5
6921 #define NACL_PLT_ENTRY_SIZE 64
6922 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6923
6924 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6925 {
6926 0xff, 0x35, /* pushl contents of address */
6927 0, 0, 0, 0, /* replaced with address of .got + 4. */
6928 0x8b, 0x0d, /* movl contents of address, %ecx */
6929 0, 0, 0, 0, /* replaced with address of .got + 8. */
6930 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6931 0xff, 0xe1 /* jmp *%ecx */
6932 };
6933
6934 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6935 {
6936 0x8b, 0x0d, /* movl contents of address, %ecx */
6937 0, 0, 0, 0, /* replaced with GOT slot address. */
6938 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6939 0xff, 0xe1, /* jmp *%ecx */
6940
6941 /* Pad to the next 32-byte boundary with nop instructions. */
6942 0x90,
6943 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6944 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6945
6946 /* Lazy GOT entries point here (32-byte aligned). */
6947 0x68, /* pushl immediate */
6948 0, 0, 0, 0, /* replaced with reloc offset. */
6949 0xe9, /* jmp relative */
6950 0, 0, 0, 0, /* replaced with offset to .plt. */
6951
6952 /* Pad to the next 32-byte boundary with nop instructions. */
6953 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6954 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6955 0x90, 0x90
6956 };
6957
6958 static const bfd_byte
6959 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6960 {
6961 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6962 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6963 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6964 0xff, 0xe1, /* jmp *%ecx */
6965
6966 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6967 so pad to that size with nop instructions. */
6968 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6969 };
6970
6971 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6972 {
6973 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6974 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6975 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6976 0xff, 0xe1, /* jmp *%ecx */
6977
6978 /* Pad to the next 32-byte boundary with nop instructions. */
6979 0x90,
6980 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6981 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6982
6983 /* Lazy GOT entries point here (32-byte aligned). */
6984 0x68, /* pushl immediate */
6985 0, 0, 0, 0, /* replaced with offset into relocation table. */
6986 0xe9, /* jmp relative */
6987 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6988
6989 /* Pad to the next 32-byte boundary with nop instructions. */
6990 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6991 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6992 0x90, 0x90
6993 };
6994
6995 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6996 {
6997 #if (PLT_CIE_LENGTH != 20 \
6998 || PLT_FDE_LENGTH != 36 \
6999 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7000 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7001 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
7002 #endif
7003 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
7004 0, 0, 0, 0, /* CIE ID */
7005 1, /* CIE version */
7006 'z', 'R', 0, /* Augmentation string */
7007 1, /* Code alignment factor */
7008 0x7c, /* Data alignment factor: -4 */
7009 8, /* Return address column */
7010 1, /* Augmentation size */
7011 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
7012 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
7013 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
7014 DW_CFA_nop, DW_CFA_nop,
7015
7016 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
7017 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
7018 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
7019 0, 0, 0, 0, /* .plt size goes here */
7020 0, /* Augmentation size */
7021 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
7022 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7023 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
7024 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7025 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
7026 13, /* Block length */
7027 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
7028 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
7029 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
7030 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
7031 DW_CFA_nop, DW_CFA_nop
7032 };
7033
7034 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt =
7035 {
7036 elf_i386_nacl_plt0_entry, /* plt0_entry */
7037 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
7038 2, /* plt0_got1_offset */
7039 8, /* plt0_got2_offset */
7040 elf_i386_nacl_plt_entry, /* plt_entry */
7041 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
7042 2, /* plt_got_offset */
7043 33, /* plt_reloc_offset */
7044 38, /* plt_plt_offset */
7045 32, /* plt_lazy_offset */
7046 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
7047 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
7048 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
7049 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
7050 };
7051
7052 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
7053 {
7054 0x90, /* plt0_pad_byte: nop insn */
7055 is_nacl /* os */
7056 };
7057
7058 static bfd_boolean
7059 elf32_i386_nacl_elf_object_p (bfd *abfd)
7060 {
7061 /* Set the right machine number for a NaCl i386 ELF32 file. */
7062 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
7063 return TRUE;
7064 }
7065
7066 #undef elf_backend_arch_data
7067 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
7068
7069 #undef elf_backend_object_p
7070 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
7071 #undef elf_backend_modify_segment_map
7072 #define elf_backend_modify_segment_map nacl_modify_segment_map
7073 #undef elf_backend_modify_program_headers
7074 #define elf_backend_modify_program_headers nacl_modify_program_headers
7075 #undef elf_backend_final_write_processing
7076 #define elf_backend_final_write_processing nacl_final_write_processing
7077
7078 #include "elf32-target.h"
7079
7080 /* Restore defaults. */
7081 #undef elf_backend_object_p
7082 #undef elf_backend_modify_segment_map
7083 #undef elf_backend_modify_program_headers
7084 #undef elf_backend_final_write_processing
7085
7086 /* VxWorks support. */
7087
7088 #undef TARGET_LITTLE_SYM
7089 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
7090 #undef TARGET_LITTLE_NAME
7091 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
7092 #undef ELF_OSABI
7093 #undef ELF_MAXPAGESIZE
7094 #define ELF_MAXPAGESIZE 0x1000
7095 #undef elf_backend_plt_alignment
7096 #define elf_backend_plt_alignment 4
7097
7098 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
7099 {
7100 0x90, /* plt0_pad_byte */
7101 is_vxworks /* os */
7102 };
7103
7104 #undef elf_backend_arch_data
7105 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
7106
7107 #undef elf_backend_relocs_compatible
7108 #undef elf_backend_add_symbol_hook
7109 #define elf_backend_add_symbol_hook \
7110 elf_vxworks_add_symbol_hook
7111 #undef elf_backend_link_output_symbol_hook
7112 #define elf_backend_link_output_symbol_hook \
7113 elf_vxworks_link_output_symbol_hook
7114 #undef elf_backend_emit_relocs
7115 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
7116 #undef elf_backend_final_write_processing
7117 #define elf_backend_final_write_processing \
7118 elf_vxworks_final_write_processing
7119 #undef elf_backend_static_tls_alignment
7120
7121 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7122 define it. */
7123 #undef elf_backend_want_plt_sym
7124 #define elf_backend_want_plt_sym 1
7125
7126 #undef elf32_bed
7127 #define elf32_bed elf32_i386_vxworks_bed
7128
7129 #include "elf32-target.h"
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