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x86: Dump local IFUNC functions in the map file
[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->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1949 isym, NULL);
1950 h->type = STT_GNU_IFUNC;
1951 h->def_regular = 1;
1952 h->ref_regular = 1;
1953 h->forced_local = 1;
1954 h->root.type = bfd_link_hash_defined;
1955 }
1956 else
1957 h = NULL;
1958 }
1959 else
1960 {
1961 isym = NULL;
1962 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1963 while (h->root.type == bfd_link_hash_indirect
1964 || h->root.type == bfd_link_hash_warning)
1965 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1966 }
1967
1968 eh = (struct elf_i386_link_hash_entry *) h;
1969 if (h != NULL)
1970 {
1971 if (r_type == R_386_GOTOFF)
1972 eh->gotoff_ref = 1;
1973
1974 /* It is referenced by a non-shared object. */
1975 h->ref_regular = 1;
1976 h->root.non_ir_ref_regular = 1;
1977
1978 if (h->type == STT_GNU_IFUNC)
1979 elf_tdata (info->output_bfd)->has_gnu_symbols
1980 |= elf_gnu_symbol_ifunc;
1981 }
1982
1983 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1984 symtab_hdr, sym_hashes,
1985 &r_type, GOT_UNKNOWN,
1986 rel, rel_end, h, r_symndx, FALSE))
1987 goto error_return;
1988
1989 switch (r_type)
1990 {
1991 case R_386_TLS_LDM:
1992 htab->tls_ldm_got.refcount += 1;
1993 goto create_got;
1994
1995 case R_386_PLT32:
1996 /* This symbol requires a procedure linkage table entry. We
1997 actually build the entry in adjust_dynamic_symbol,
1998 because this might be a case of linking PIC code which is
1999 never referenced by a dynamic object, in which case we
2000 don't need to generate a procedure linkage table entry
2001 after all. */
2002
2003 /* If this is a local symbol, we resolve it directly without
2004 creating a procedure linkage table entry. */
2005 if (h == NULL)
2006 continue;
2007
2008 eh->has_got_reloc = 1;
2009 h->needs_plt = 1;
2010 h->plt.refcount += 1;
2011 break;
2012
2013 case R_386_SIZE32:
2014 size_reloc = TRUE;
2015 goto do_size;
2016
2017 case R_386_TLS_IE_32:
2018 case R_386_TLS_IE:
2019 case R_386_TLS_GOTIE:
2020 if (!bfd_link_executable (info))
2021 info->flags |= DF_STATIC_TLS;
2022 /* Fall through */
2023
2024 case R_386_GOT32:
2025 case R_386_GOT32X:
2026 case R_386_TLS_GD:
2027 case R_386_TLS_GOTDESC:
2028 case R_386_TLS_DESC_CALL:
2029 /* This symbol requires a global offset table entry. */
2030 {
2031 int tls_type, old_tls_type;
2032
2033 switch (r_type)
2034 {
2035 default:
2036 case R_386_GOT32:
2037 case R_386_GOT32X:
2038 tls_type = GOT_NORMAL;
2039 break;
2040 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
2041 case R_386_TLS_GOTDESC:
2042 case R_386_TLS_DESC_CALL:
2043 tls_type = GOT_TLS_GDESC; break;
2044 case R_386_TLS_IE_32:
2045 if (ELF32_R_TYPE (rel->r_info) == r_type)
2046 tls_type = GOT_TLS_IE_NEG;
2047 else
2048 /* If this is a GD->IE transition, we may use either of
2049 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2050 tls_type = GOT_TLS_IE;
2051 break;
2052 case R_386_TLS_IE:
2053 case R_386_TLS_GOTIE:
2054 tls_type = GOT_TLS_IE_POS; break;
2055 }
2056
2057 if (h != NULL)
2058 {
2059 h->got.refcount += 1;
2060 old_tls_type = elf_i386_hash_entry(h)->tls_type;
2061 }
2062 else
2063 {
2064 bfd_signed_vma *local_got_refcounts;
2065
2066 /* This is a global offset table entry for a local symbol. */
2067 local_got_refcounts = elf_local_got_refcounts (abfd);
2068 if (local_got_refcounts == NULL)
2069 {
2070 bfd_size_type size;
2071
2072 size = symtab_hdr->sh_info;
2073 size *= (sizeof (bfd_signed_vma)
2074 + sizeof (bfd_vma) + sizeof(char));
2075 local_got_refcounts = (bfd_signed_vma *)
2076 bfd_zalloc (abfd, size);
2077 if (local_got_refcounts == NULL)
2078 goto error_return;
2079 elf_local_got_refcounts (abfd) = local_got_refcounts;
2080 elf_i386_local_tlsdesc_gotent (abfd)
2081 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2082 elf_i386_local_got_tls_type (abfd)
2083 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2084 }
2085 local_got_refcounts[r_symndx] += 1;
2086 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
2087 }
2088
2089 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
2090 tls_type |= old_tls_type;
2091 /* If a TLS symbol is accessed using IE at least once,
2092 there is no point to use dynamic model for it. */
2093 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2094 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2095 || (tls_type & GOT_TLS_IE) == 0))
2096 {
2097 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
2098 tls_type = old_tls_type;
2099 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2100 && GOT_TLS_GD_ANY_P (tls_type))
2101 tls_type |= old_tls_type;
2102 else
2103 {
2104 if (h)
2105 name = h->root.root.string;
2106 else
2107 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2108 NULL);
2109 _bfd_error_handler
2110 /* xgettext:c-format */
2111 (_("%B: `%s' accessed both as normal and "
2112 "thread local symbol"),
2113 abfd, name);
2114 bfd_set_error (bfd_error_bad_value);
2115 goto error_return;
2116 }
2117 }
2118
2119 if (old_tls_type != tls_type)
2120 {
2121 if (h != NULL)
2122 elf_i386_hash_entry (h)->tls_type = tls_type;
2123 else
2124 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
2125 }
2126 }
2127 /* Fall through */
2128
2129 case R_386_GOTOFF:
2130 case R_386_GOTPC:
2131 create_got:
2132 if (r_type != R_386_TLS_IE)
2133 {
2134 if (eh != NULL)
2135 eh->has_got_reloc = 1;
2136 break;
2137 }
2138 /* Fall through */
2139
2140 case R_386_TLS_LE_32:
2141 case R_386_TLS_LE:
2142 if (eh != NULL)
2143 eh->has_got_reloc = 1;
2144 if (bfd_link_executable (info))
2145 break;
2146 info->flags |= DF_STATIC_TLS;
2147 goto do_relocation;
2148
2149 case R_386_32:
2150 case R_386_PC32:
2151 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2152 eh->has_non_got_reloc = 1;
2153 do_relocation:
2154 /* We are called after all symbols have been resolved. Only
2155 relocation against STT_GNU_IFUNC symbol must go through
2156 PLT. */
2157 if (h != NULL
2158 && (bfd_link_executable (info)
2159 || h->type == STT_GNU_IFUNC))
2160 {
2161 /* If this reloc is in a read-only section, we might
2162 need a copy reloc. We can't check reliably at this
2163 stage whether the section is read-only, as input
2164 sections have not yet been mapped to output sections.
2165 Tentatively set the flag for now, and correct in
2166 adjust_dynamic_symbol. */
2167 h->non_got_ref = 1;
2168
2169 /* We may need a .plt entry if the symbol is a function
2170 defined in a shared lib or is a STT_GNU_IFUNC function
2171 referenced from the code or read-only section. */
2172 if (!h->def_regular
2173 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2174 h->plt.refcount += 1;
2175
2176 if (r_type == R_386_PC32)
2177 {
2178 /* Since something like ".long foo - ." may be used
2179 as pointer, make sure that PLT is used if foo is
2180 a function defined in a shared library. */
2181 if ((sec->flags & SEC_CODE) == 0)
2182 h->pointer_equality_needed = 1;
2183 else if (h->type == STT_GNU_IFUNC
2184 && bfd_link_pic (info))
2185 {
2186 _bfd_error_handler
2187 /* xgettext:c-format */
2188 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
2189 abfd, h->root.root.string);
2190 bfd_set_error (bfd_error_bad_value);
2191 goto error_return;
2192 }
2193 }
2194 else
2195 {
2196 h->pointer_equality_needed = 1;
2197 /* R_386_32 can be resolved at run-time. */
2198 if (r_type == R_386_32
2199 && (sec->flags & SEC_READONLY) == 0)
2200 eh->func_pointer_refcount += 1;
2201 }
2202 }
2203
2204 size_reloc = FALSE;
2205 do_size:
2206 /* If we are creating a shared library, and this is a reloc
2207 against a global symbol, or a non PC relative reloc
2208 against a local symbol, then we need to copy the reloc
2209 into the shared library. However, if we are linking with
2210 -Bsymbolic, we do not need to copy a reloc against a
2211 global symbol which is defined in an object we are
2212 including in the link (i.e., DEF_REGULAR is set). At
2213 this point we have not seen all the input files, so it is
2214 possible that DEF_REGULAR is not set now but will be set
2215 later (it is never cleared). In case of a weak definition,
2216 DEF_REGULAR may be cleared later by a strong definition in
2217 a shared library. We account for that possibility below by
2218 storing information in the relocs_copied field of the hash
2219 table entry. A similar situation occurs when creating
2220 shared libraries and symbol visibility changes render the
2221 symbol local.
2222
2223 If on the other hand, we are creating an executable, we
2224 may need to keep relocations for symbols satisfied by a
2225 dynamic library if we manage to avoid copy relocs for the
2226 symbol.
2227
2228 Generate dynamic pointer relocation against STT_GNU_IFUNC
2229 symbol in the non-code section. */
2230 if ((bfd_link_pic (info)
2231 && (r_type != R_386_PC32
2232 || (h != NULL
2233 && (! (bfd_link_pie (info)
2234 || SYMBOLIC_BIND (info, h))
2235 || h->root.type == bfd_link_hash_defweak
2236 || !h->def_regular))))
2237 || (h != NULL
2238 && h->type == STT_GNU_IFUNC
2239 && r_type == R_386_32
2240 && (sec->flags & SEC_CODE) == 0)
2241 || (ELIMINATE_COPY_RELOCS
2242 && !bfd_link_pic (info)
2243 && h != NULL
2244 && (h->root.type == bfd_link_hash_defweak
2245 || !h->def_regular)))
2246 {
2247 struct elf_dyn_relocs *p;
2248 struct elf_dyn_relocs **head;
2249
2250 /* We must copy these reloc types into the output file.
2251 Create a reloc section in dynobj and make room for
2252 this reloc. */
2253 if (sreloc == NULL)
2254 {
2255 sreloc = _bfd_elf_make_dynamic_reloc_section
2256 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
2257
2258 if (sreloc == NULL)
2259 goto error_return;
2260 }
2261
2262 /* If this is a global symbol, we count the number of
2263 relocations we need for this symbol. */
2264 if (h != NULL)
2265 {
2266 head = &eh->dyn_relocs;
2267 }
2268 else
2269 {
2270 /* Track dynamic relocs needed for local syms too.
2271 We really need local syms available to do this
2272 easily. Oh well. */
2273 void **vpp;
2274 asection *s;
2275
2276 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2277 abfd, r_symndx);
2278 if (isym == NULL)
2279 goto error_return;
2280
2281 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2282 if (s == NULL)
2283 s = sec;
2284
2285 vpp = &elf_section_data (s)->local_dynrel;
2286 head = (struct elf_dyn_relocs **)vpp;
2287 }
2288
2289 p = *head;
2290 if (p == NULL || p->sec != sec)
2291 {
2292 bfd_size_type amt = sizeof *p;
2293 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
2294 amt);
2295 if (p == NULL)
2296 goto error_return;
2297 p->next = *head;
2298 *head = p;
2299 p->sec = sec;
2300 p->count = 0;
2301 p->pc_count = 0;
2302 }
2303
2304 p->count += 1;
2305 /* Count size relocation as PC-relative relocation. */
2306 if (r_type == R_386_PC32 || size_reloc)
2307 p->pc_count += 1;
2308 }
2309 break;
2310
2311 /* This relocation describes the C++ object vtable hierarchy.
2312 Reconstruct it for later use during GC. */
2313 case R_386_GNU_VTINHERIT:
2314 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2315 goto error_return;
2316 break;
2317
2318 /* This relocation describes which C++ vtable entries are actually
2319 used. Record for later use during GC. */
2320 case R_386_GNU_VTENTRY:
2321 BFD_ASSERT (h != NULL);
2322 if (h != NULL
2323 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
2324 goto error_return;
2325 break;
2326
2327 default:
2328 break;
2329 }
2330
2331 if (r_type == R_386_GOT32X
2332 && (h == NULL || h->type != STT_GNU_IFUNC))
2333 sec->need_convert_load = 1;
2334 }
2335
2336 if (elf_section_data (sec)->this_hdr.contents != contents)
2337 {
2338 if (!info->keep_memory)
2339 free (contents);
2340 else
2341 {
2342 /* Cache the section contents for elf_link_input_bfd. */
2343 elf_section_data (sec)->this_hdr.contents = contents;
2344 }
2345 }
2346
2347 return TRUE;
2348
2349 error_return:
2350 if (elf_section_data (sec)->this_hdr.contents != contents)
2351 free (contents);
2352 sec->check_relocs_failed = 1;
2353 return FALSE;
2354 }
2355
2356 /* Return the section that should be marked against GC for a given
2357 relocation. */
2358
2359 static asection *
2360 elf_i386_gc_mark_hook (asection *sec,
2361 struct bfd_link_info *info,
2362 Elf_Internal_Rela *rel,
2363 struct elf_link_hash_entry *h,
2364 Elf_Internal_Sym *sym)
2365 {
2366 if (h != NULL)
2367 switch (ELF32_R_TYPE (rel->r_info))
2368 {
2369 case R_386_GNU_VTINHERIT:
2370 case R_386_GNU_VTENTRY:
2371 return NULL;
2372 }
2373
2374 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2375 }
2376
2377 /* Remove undefined weak symbol from the dynamic symbol table if it
2378 is resolved to 0. */
2379
2380 static bfd_boolean
2381 elf_i386_fixup_symbol (struct bfd_link_info *info,
2382 struct elf_link_hash_entry *h)
2383 {
2384 if (h->dynindx != -1
2385 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2386 elf_i386_hash_entry (h)->has_got_reloc,
2387 elf_i386_hash_entry (h)))
2388 {
2389 h->dynindx = -1;
2390 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2391 h->dynstr_index);
2392 }
2393 return TRUE;
2394 }
2395
2396 /* Adjust a symbol defined by a dynamic object and referenced by a
2397 regular object. The current definition is in some section of the
2398 dynamic object, but we're not including those sections. We have to
2399 change the definition to something the rest of the link can
2400 understand. */
2401
2402 static bfd_boolean
2403 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2404 struct elf_link_hash_entry *h)
2405 {
2406 struct elf_i386_link_hash_table *htab;
2407 asection *s, *srel;
2408 struct elf_i386_link_hash_entry *eh;
2409 struct elf_dyn_relocs *p;
2410
2411 /* STT_GNU_IFUNC symbol must go through PLT. */
2412 if (h->type == STT_GNU_IFUNC)
2413 {
2414 /* All local STT_GNU_IFUNC references must be treate as local
2415 calls via local PLT. */
2416 if (h->ref_regular
2417 && SYMBOL_CALLS_LOCAL (info, h))
2418 {
2419 bfd_size_type pc_count = 0, count = 0;
2420 struct elf_dyn_relocs **pp;
2421
2422 eh = (struct elf_i386_link_hash_entry *) h;
2423 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2424 {
2425 pc_count += p->pc_count;
2426 p->count -= p->pc_count;
2427 p->pc_count = 0;
2428 count += p->count;
2429 if (p->count == 0)
2430 *pp = p->next;
2431 else
2432 pp = &p->next;
2433 }
2434
2435 if (pc_count || count)
2436 {
2437 h->non_got_ref = 1;
2438 if (pc_count)
2439 {
2440 /* Increment PLT reference count only for PC-relative
2441 references. */
2442 h->needs_plt = 1;
2443 if (h->plt.refcount <= 0)
2444 h->plt.refcount = 1;
2445 else
2446 h->plt.refcount += 1;
2447 }
2448 }
2449 }
2450
2451 if (h->plt.refcount <= 0)
2452 {
2453 h->plt.offset = (bfd_vma) -1;
2454 h->needs_plt = 0;
2455 }
2456 return TRUE;
2457 }
2458
2459 /* If this is a function, put it in the procedure linkage table. We
2460 will fill in the contents of the procedure linkage table later,
2461 when we know the address of the .got section. */
2462 if (h->type == STT_FUNC
2463 || h->needs_plt)
2464 {
2465 if (h->plt.refcount <= 0
2466 || SYMBOL_CALLS_LOCAL (info, h)
2467 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2468 && h->root.type == bfd_link_hash_undefweak))
2469 {
2470 /* This case can occur if we saw a PLT32 reloc in an input
2471 file, but the symbol was never referred to by a dynamic
2472 object, or if all references were garbage collected. In
2473 such a case, we don't actually need to build a procedure
2474 linkage table, and we can just do a PC32 reloc instead. */
2475 h->plt.offset = (bfd_vma) -1;
2476 h->needs_plt = 0;
2477 }
2478
2479 return TRUE;
2480 }
2481 else
2482 /* It's possible that we incorrectly decided a .plt reloc was
2483 needed for an R_386_PC32 reloc to a non-function sym in
2484 check_relocs. We can't decide accurately between function and
2485 non-function syms in check-relocs; Objects loaded later in
2486 the link may change h->type. So fix it now. */
2487 h->plt.offset = (bfd_vma) -1;
2488
2489 /* If this is a weak symbol, and there is a real definition, the
2490 processor independent code will have arranged for us to see the
2491 real definition first, and we can just use the same value. */
2492 if (h->u.weakdef != NULL)
2493 {
2494 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2495 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2496 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2497 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2498 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2499 h->non_got_ref = h->u.weakdef->non_got_ref;
2500 return TRUE;
2501 }
2502
2503 /* This is a reference to a symbol defined by a dynamic object which
2504 is not a function. */
2505
2506 /* If we are creating a shared library, we must presume that the
2507 only references to the symbol are via the global offset table.
2508 For such cases we need not do anything here; the relocations will
2509 be handled correctly by relocate_section. */
2510 if (!bfd_link_executable (info))
2511 return TRUE;
2512
2513 /* If there are no references to this symbol that do not use the
2514 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2515 reloc. */
2516 eh = (struct elf_i386_link_hash_entry *) h;
2517 if (!h->non_got_ref && !eh->gotoff_ref)
2518 return TRUE;
2519
2520 /* If -z nocopyreloc was given, we won't generate them either. */
2521 if (info->nocopyreloc)
2522 {
2523 h->non_got_ref = 0;
2524 return TRUE;
2525 }
2526
2527 htab = elf_i386_hash_table (info);
2528 if (htab == NULL)
2529 return FALSE;
2530
2531 /* If there aren't any dynamic relocs in read-only sections nor
2532 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2533 avoid the copy reloc. This doesn't work on VxWorks, where we can
2534 not have dynamic relocations (other than copy and jump slot
2535 relocations) in an executable. */
2536 if (ELIMINATE_COPY_RELOCS
2537 && !eh->gotoff_ref
2538 && get_elf_i386_backend_data (info->output_bfd)->os != is_vxworks)
2539 {
2540 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2541 {
2542 s = p->sec->output_section;
2543 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2544 break;
2545 }
2546
2547 if (p == NULL)
2548 {
2549 h->non_got_ref = 0;
2550 return TRUE;
2551 }
2552 }
2553
2554 /* We must allocate the symbol in our .dynbss section, which will
2555 become part of the .bss section of the executable. There will be
2556 an entry for this symbol in the .dynsym section. The dynamic
2557 object will contain position independent code, so all references
2558 from the dynamic object to this symbol will go through the global
2559 offset table. The dynamic linker will use the .dynsym entry to
2560 determine the address it must put in the global offset table, so
2561 both the dynamic object and the regular object will refer to the
2562 same memory location for the variable. */
2563
2564 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2565 copy the initial value out of the dynamic object and into the
2566 runtime process image. */
2567 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
2568 {
2569 s = htab->elf.sdynrelro;
2570 srel = htab->elf.sreldynrelro;
2571 }
2572 else
2573 {
2574 s = htab->elf.sdynbss;
2575 srel = htab->elf.srelbss;
2576 }
2577 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2578 {
2579 srel->size += sizeof (Elf32_External_Rel);
2580 h->needs_copy = 1;
2581 }
2582
2583 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2584 }
2585
2586 /* Allocate space in .plt, .got and associated reloc sections for
2587 dynamic relocs. */
2588
2589 static bfd_boolean
2590 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2591 {
2592 struct bfd_link_info *info;
2593 struct elf_i386_link_hash_table *htab;
2594 struct elf_i386_link_hash_entry *eh;
2595 struct elf_dyn_relocs *p;
2596 unsigned plt_entry_size;
2597 bfd_boolean resolved_to_zero;
2598 const struct elf_i386_backend_data *bed;
2599
2600 if (h->root.type == bfd_link_hash_indirect)
2601 return TRUE;
2602
2603 eh = (struct elf_i386_link_hash_entry *) h;
2604
2605 info = (struct bfd_link_info *) inf;
2606 htab = elf_i386_hash_table (info);
2607 if (htab == NULL)
2608 return FALSE;
2609
2610 bed = get_elf_i386_backend_data (info->output_bfd);
2611
2612 plt_entry_size = htab->plt.plt_entry_size;
2613
2614 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2615 eh->has_got_reloc,
2616 eh);
2617
2618 /* Clear the reference count of function pointer relocations if
2619 symbol isn't a normal function. */
2620 if (h->type != STT_FUNC)
2621 eh->func_pointer_refcount = 0;
2622
2623 /* We can't use the GOT PLT if pointer equality is needed since
2624 finish_dynamic_symbol won't clear symbol value and the dynamic
2625 linker won't update the GOT slot. We will get into an infinite
2626 loop at run-time. */
2627 if (htab->plt_got != NULL
2628 && h->type != STT_GNU_IFUNC
2629 && !h->pointer_equality_needed
2630 && h->plt.refcount > 0
2631 && h->got.refcount > 0)
2632 {
2633 /* Don't use the regular PLT if there are both GOT and GOTPLT
2634 reloctions. */
2635 h->plt.offset = (bfd_vma) -1;
2636
2637 /* Use the GOT PLT. */
2638 eh->plt_got.refcount = 1;
2639 }
2640
2641 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2642 here if it is defined and referenced in a non-shared object. */
2643 if (h->type == STT_GNU_IFUNC
2644 && h->def_regular)
2645 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2646 &htab->readonly_dynrelocs_against_ifunc,
2647 plt_entry_size,
2648 (htab->plt.has_plt0 *
2649 plt_entry_size),
2650 4, TRUE);
2651 /* Don't create the PLT entry if there are only function pointer
2652 relocations which can be resolved at run-time. */
2653 else if (htab->elf.dynamic_sections_created
2654 && (h->plt.refcount > eh->func_pointer_refcount
2655 || eh->plt_got.refcount > 0))
2656 {
2657 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2658
2659 /* Clear the reference count of function pointer relocations
2660 if PLT is used. */
2661 eh->func_pointer_refcount = 0;
2662
2663 /* Make sure this symbol is output as a dynamic symbol.
2664 Undefined weak syms won't yet be marked as dynamic. */
2665 if (h->dynindx == -1
2666 && !h->forced_local
2667 && !resolved_to_zero
2668 && h->root.type == bfd_link_hash_undefweak)
2669 {
2670 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2671 return FALSE;
2672 }
2673
2674 if (bfd_link_pic (info)
2675 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2676 {
2677 asection *s = htab->elf.splt;
2678 asection *got_s = htab->plt_got;
2679
2680 /* If this is the first .plt entry, make room for the special
2681 first entry. The .plt section is used by prelink to undo
2682 prelinking for dynamic relocations. */
2683 if (s->size == 0)
2684 s->size = htab->plt.has_plt0 * plt_entry_size;
2685
2686 if (use_plt_got)
2687 eh->plt_got.offset = got_s->size;
2688 else
2689 h->plt.offset = s->size;
2690
2691 /* If this symbol is not defined in a regular file, and we are
2692 not generating a shared library, then set the symbol to this
2693 location in the .plt. This is required to make function
2694 pointers compare as equal between the normal executable and
2695 the shared library. */
2696 if (! bfd_link_pic (info)
2697 && !h->def_regular)
2698 {
2699 if (use_plt_got)
2700 {
2701 /* We need to make a call to the entry of the GOT PLT
2702 instead of regular PLT entry. */
2703 h->root.u.def.section = got_s;
2704 h->root.u.def.value = eh->plt_got.offset;
2705 }
2706 else
2707 {
2708 h->root.u.def.section = s;
2709 h->root.u.def.value = h->plt.offset;
2710 }
2711 }
2712
2713 /* Make room for this entry. */
2714 if (use_plt_got)
2715 got_s->size += htab->non_lazy_plt->plt_entry_size;
2716 else
2717 {
2718 s->size += plt_entry_size;
2719
2720 /* We also need to make an entry in the .got.plt section,
2721 which will be placed in the .got section by the linker
2722 script. */
2723 htab->elf.sgotplt->size += 4;
2724
2725 /* There should be no PLT relocation against resolved
2726 undefined weak symbol in executable. */
2727 if (!resolved_to_zero)
2728 {
2729 /* We also need to make an entry in the .rel.plt
2730 section. */
2731 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2732 htab->elf.srelplt->reloc_count++;
2733 }
2734 }
2735
2736 if (bed->os == is_vxworks && !bfd_link_pic (info))
2737 {
2738 /* VxWorks has a second set of relocations for each PLT entry
2739 in executables. They go in a separate relocation section,
2740 which is processed by the kernel loader. */
2741
2742 /* There are two relocations for the initial PLT entry: an
2743 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2744 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2745
2746 if (h->plt.offset == plt_entry_size)
2747 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2748
2749 /* There are two extra relocations for each subsequent PLT entry:
2750 an R_386_32 relocation for the GOT entry, and an R_386_32
2751 relocation for the PLT entry. */
2752
2753 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2754 }
2755 }
2756 else
2757 {
2758 eh->plt_got.offset = (bfd_vma) -1;
2759 h->plt.offset = (bfd_vma) -1;
2760 h->needs_plt = 0;
2761 }
2762 }
2763 else
2764 {
2765 eh->plt_got.offset = (bfd_vma) -1;
2766 h->plt.offset = (bfd_vma) -1;
2767 h->needs_plt = 0;
2768 }
2769
2770 eh->tlsdesc_got = (bfd_vma) -1;
2771
2772 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2773 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2774 if (h->got.refcount > 0
2775 && bfd_link_executable (info)
2776 && h->dynindx == -1
2777 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2778 h->got.offset = (bfd_vma) -1;
2779 else if (h->got.refcount > 0)
2780 {
2781 asection *s;
2782 bfd_boolean dyn;
2783 int tls_type = elf_i386_hash_entry(h)->tls_type;
2784
2785 /* Make sure this symbol is output as a dynamic symbol.
2786 Undefined weak syms won't yet be marked as dynamic. */
2787 if (h->dynindx == -1
2788 && !h->forced_local
2789 && !resolved_to_zero
2790 && h->root.type == bfd_link_hash_undefweak)
2791 {
2792 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2793 return FALSE;
2794 }
2795
2796 s = htab->elf.sgot;
2797 if (GOT_TLS_GDESC_P (tls_type))
2798 {
2799 eh->tlsdesc_got = htab->elf.sgotplt->size
2800 - elf_i386_compute_jump_table_size (htab);
2801 htab->elf.sgotplt->size += 8;
2802 h->got.offset = (bfd_vma) -2;
2803 }
2804 if (! GOT_TLS_GDESC_P (tls_type)
2805 || GOT_TLS_GD_P (tls_type))
2806 {
2807 h->got.offset = s->size;
2808 s->size += 4;
2809 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2810 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2811 s->size += 4;
2812 }
2813 dyn = htab->elf.dynamic_sections_created;
2814 /* R_386_TLS_IE_32 needs one dynamic relocation,
2815 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2816 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2817 need two), R_386_TLS_GD needs one if local symbol and two if
2818 global. No dynamic relocation against resolved undefined weak
2819 symbol in executable. */
2820 if (tls_type == GOT_TLS_IE_BOTH)
2821 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2822 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2823 || (tls_type & GOT_TLS_IE))
2824 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2825 else if (GOT_TLS_GD_P (tls_type))
2826 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2827 else if (! GOT_TLS_GDESC_P (tls_type)
2828 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2829 && !resolved_to_zero)
2830 || h->root.type != bfd_link_hash_undefweak)
2831 && (bfd_link_pic (info)
2832 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2833 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2834 if (GOT_TLS_GDESC_P (tls_type))
2835 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2836 }
2837 else
2838 h->got.offset = (bfd_vma) -1;
2839
2840 if (eh->dyn_relocs == NULL)
2841 return TRUE;
2842
2843 /* In the shared -Bsymbolic case, discard space allocated for
2844 dynamic pc-relative relocs against symbols which turn out to be
2845 defined in regular objects. For the normal shared case, discard
2846 space for pc-relative relocs that have become local due to symbol
2847 visibility changes. */
2848
2849 if (bfd_link_pic (info))
2850 {
2851 /* The only reloc that uses pc_count is R_386_PC32, which will
2852 appear on a call or on something like ".long foo - .". We
2853 want calls to protected symbols to resolve directly to the
2854 function rather than going via the plt. If people want
2855 function pointer comparisons to work as expected then they
2856 should avoid writing assembly like ".long foo - .". */
2857 if (SYMBOL_CALLS_LOCAL (info, h))
2858 {
2859 struct elf_dyn_relocs **pp;
2860
2861 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2862 {
2863 p->count -= p->pc_count;
2864 p->pc_count = 0;
2865 if (p->count == 0)
2866 *pp = p->next;
2867 else
2868 pp = &p->next;
2869 }
2870 }
2871
2872 if (bed->os == is_vxworks)
2873 {
2874 struct elf_dyn_relocs **pp;
2875 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2876 {
2877 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2878 *pp = p->next;
2879 else
2880 pp = &p->next;
2881 }
2882 }
2883
2884 /* Also discard relocs on undefined weak syms with non-default
2885 visibility or in PIE. */
2886 if (eh->dyn_relocs != NULL
2887 && h->root.type == bfd_link_hash_undefweak)
2888 {
2889 /* Undefined weak symbol is never bound locally in shared
2890 library. */
2891 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2892 || resolved_to_zero)
2893 {
2894 if (h->non_got_ref)
2895 {
2896 /* Keep dynamic non-GOT/non-PLT relocation so that we
2897 can branch to 0 without PLT. */
2898 struct elf_dyn_relocs **pp;
2899
2900 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2901 if (p->pc_count == 0)
2902 *pp = p->next;
2903 else
2904 {
2905 /* Remove non-R_386_PC32 relocation. */
2906 p->count = p->pc_count;
2907 pp = &p->next;
2908 }
2909
2910 if (eh->dyn_relocs != NULL)
2911 {
2912 /* Make sure undefined weak symbols are output
2913 as dynamic symbols in PIEs for dynamic non-GOT
2914 non-PLT reloations. */
2915 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2916 return FALSE;
2917 }
2918 }
2919 else
2920 eh->dyn_relocs = NULL;
2921 }
2922 else if (h->dynindx == -1
2923 && !h->forced_local)
2924 {
2925 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2926 return FALSE;
2927 }
2928 }
2929 }
2930 else if (ELIMINATE_COPY_RELOCS)
2931 {
2932 /* For the non-shared case, discard space for relocs against
2933 symbols which turn out to need copy relocs or are not
2934 dynamic. Keep dynamic relocations for run-time function
2935 pointer initialization. */
2936
2937 if ((!h->non_got_ref
2938 || eh->func_pointer_refcount > 0
2939 || (h->root.type == bfd_link_hash_undefweak
2940 && !resolved_to_zero))
2941 && ((h->def_dynamic
2942 && !h->def_regular)
2943 || (htab->elf.dynamic_sections_created
2944 && (h->root.type == bfd_link_hash_undefweak
2945 || h->root.type == bfd_link_hash_undefined))))
2946 {
2947 /* Make sure this symbol is output as a dynamic symbol.
2948 Undefined weak syms won't yet be marked as dynamic. */
2949 if (h->dynindx == -1
2950 && !h->forced_local
2951 && !resolved_to_zero
2952 && h->root.type == bfd_link_hash_undefweak)
2953 {
2954 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2955 return FALSE;
2956 }
2957
2958 /* If that succeeded, we know we'll be keeping all the
2959 relocs. */
2960 if (h->dynindx != -1)
2961 goto keep;
2962 }
2963
2964 eh->dyn_relocs = NULL;
2965 eh->func_pointer_refcount = 0;
2966
2967 keep: ;
2968 }
2969
2970 /* Finally, allocate space. */
2971 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2972 {
2973 asection *sreloc;
2974
2975 sreloc = elf_section_data (p->sec)->sreloc;
2976
2977 BFD_ASSERT (sreloc != NULL);
2978 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2979 }
2980
2981 return TRUE;
2982 }
2983
2984 /* Allocate space in .plt, .got and associated reloc sections for
2985 local dynamic relocs. */
2986
2987 static bfd_boolean
2988 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2989 {
2990 struct elf_link_hash_entry *h
2991 = (struct elf_link_hash_entry *) *slot;
2992
2993 if (h->type != STT_GNU_IFUNC
2994 || !h->def_regular
2995 || !h->ref_regular
2996 || !h->forced_local
2997 || h->root.type != bfd_link_hash_defined)
2998 abort ();
2999
3000 return elf_i386_allocate_dynrelocs (h, inf);
3001 }
3002
3003 /* Find any dynamic relocs that apply to read-only sections. */
3004
3005 static bfd_boolean
3006 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
3007 {
3008 struct elf_i386_link_hash_entry *eh;
3009 struct elf_dyn_relocs *p;
3010
3011 /* Skip local IFUNC symbols. */
3012 if (h->forced_local && h->type == STT_GNU_IFUNC)
3013 return TRUE;
3014
3015 eh = (struct elf_i386_link_hash_entry *) h;
3016 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3017 {
3018 asection *s = p->sec->output_section;
3019
3020 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3021 {
3022 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3023
3024 info->flags |= DF_TEXTREL;
3025
3026 if ((info->warn_shared_textrel && bfd_link_pic (info))
3027 || info->error_textrel)
3028 /* xgettext:c-format */
3029 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3030 p->sec->owner, h->root.root.string,
3031 p->sec);
3032
3033 /* Not an error, just cut short the traversal. */
3034 return FALSE;
3035 }
3036 }
3037 return TRUE;
3038 }
3039
3040 /* Convert load via the GOT slot to load immediate. */
3041
3042 static bfd_boolean
3043 elf_i386_convert_load (bfd *abfd, asection *sec,
3044 struct bfd_link_info *link_info)
3045 {
3046 struct elf_i386_link_hash_table *htab;
3047 Elf_Internal_Shdr *symtab_hdr;
3048 Elf_Internal_Rela *internal_relocs;
3049 Elf_Internal_Rela *irel, *irelend;
3050 bfd_byte *contents;
3051 bfd_boolean changed;
3052 bfd_signed_vma *local_got_refcounts;
3053
3054 /* Don't even try to convert non-ELF outputs. */
3055 if (!is_elf_hash_table (link_info->hash))
3056 return FALSE;
3057
3058 /* Nothing to do if there is no need or no output. */
3059 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3060 || sec->need_convert_load == 0
3061 || bfd_is_abs_section (sec->output_section))
3062 return TRUE;
3063
3064 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3065
3066 /* Load the relocations for this section. */
3067 internal_relocs = (_bfd_elf_link_read_relocs
3068 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3069 link_info->keep_memory));
3070 if (internal_relocs == NULL)
3071 return FALSE;
3072
3073 changed = FALSE;
3074 htab = elf_i386_hash_table (link_info);
3075 local_got_refcounts = elf_local_got_refcounts (abfd);
3076
3077 /* Get the section contents. */
3078 if (elf_section_data (sec)->this_hdr.contents != NULL)
3079 contents = elf_section_data (sec)->this_hdr.contents;
3080 else
3081 {
3082 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3083 goto error_return;
3084 }
3085
3086 irelend = internal_relocs + sec->reloc_count;
3087 for (irel = internal_relocs; irel < irelend; irel++)
3088 {
3089 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3090 unsigned int r_symndx;
3091 struct elf_link_hash_entry *h;
3092 bfd_boolean converted;
3093
3094 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3095 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3096 if (r_type != R_386_GOT32X)
3097 continue;
3098
3099 r_symndx = ELF32_R_SYM (irel->r_info);
3100 if (r_symndx < symtab_hdr->sh_info)
3101 h = elf_i386_get_local_sym_hash (htab, sec->owner,
3102 (const Elf_Internal_Rela *) irel,
3103 FALSE);
3104 else
3105 {
3106 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3107 while (h->root.type == bfd_link_hash_indirect
3108 || h->root.type == bfd_link_hash_warning)
3109 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3110 }
3111
3112 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3113 if (h != NULL && h->type == STT_GNU_IFUNC)
3114 continue;
3115
3116 converted = FALSE;
3117 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
3118 irel, h, &converted, link_info))
3119 goto error_return;
3120
3121 if (converted)
3122 {
3123 changed = converted;
3124 if (h)
3125 {
3126 if (h->got.refcount > 0)
3127 h->got.refcount -= 1;
3128 }
3129 else
3130 {
3131 if (local_got_refcounts != NULL
3132 && local_got_refcounts[r_symndx] > 0)
3133 local_got_refcounts[r_symndx] -= 1;
3134 }
3135 }
3136 }
3137
3138 if (contents != NULL
3139 && elf_section_data (sec)->this_hdr.contents != contents)
3140 {
3141 if (!changed && !link_info->keep_memory)
3142 free (contents);
3143 else
3144 {
3145 /* Cache the section contents for elf_link_input_bfd. */
3146 elf_section_data (sec)->this_hdr.contents = contents;
3147 }
3148 }
3149
3150 if (elf_section_data (sec)->relocs != internal_relocs)
3151 {
3152 if (!changed)
3153 free (internal_relocs);
3154 else
3155 elf_section_data (sec)->relocs = internal_relocs;
3156 }
3157
3158 return TRUE;
3159
3160 error_return:
3161 if (contents != NULL
3162 && elf_section_data (sec)->this_hdr.contents != contents)
3163 free (contents);
3164 if (internal_relocs != NULL
3165 && elf_section_data (sec)->relocs != internal_relocs)
3166 free (internal_relocs);
3167 return FALSE;
3168 }
3169
3170 /* Set the sizes of the dynamic sections. */
3171
3172 static bfd_boolean
3173 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3174 {
3175 struct elf_i386_link_hash_table *htab;
3176 bfd *dynobj;
3177 asection *s;
3178 bfd_boolean relocs;
3179 bfd *ibfd;
3180
3181 htab = elf_i386_hash_table (info);
3182 if (htab == NULL)
3183 return FALSE;
3184 dynobj = htab->elf.dynobj;
3185 if (dynobj == NULL)
3186 abort ();
3187
3188 /* Set up .got offsets for local syms, and space for local dynamic
3189 relocs. */
3190 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3191 {
3192 bfd_signed_vma *local_got;
3193 bfd_signed_vma *end_local_got;
3194 char *local_tls_type;
3195 bfd_vma *local_tlsdesc_gotent;
3196 bfd_size_type locsymcount;
3197 Elf_Internal_Shdr *symtab_hdr;
3198 asection *srel;
3199
3200 if (! is_i386_elf (ibfd))
3201 continue;
3202
3203 for (s = ibfd->sections; s != NULL; s = s->next)
3204 {
3205 struct elf_dyn_relocs *p;
3206
3207 if (!elf_i386_convert_load (ibfd, s, info))
3208 return FALSE;
3209
3210 for (p = ((struct elf_dyn_relocs *)
3211 elf_section_data (s)->local_dynrel);
3212 p != NULL;
3213 p = p->next)
3214 {
3215 if (!bfd_is_abs_section (p->sec)
3216 && bfd_is_abs_section (p->sec->output_section))
3217 {
3218 /* Input section has been discarded, either because
3219 it is a copy of a linkonce section or due to
3220 linker script /DISCARD/, so we'll be discarding
3221 the relocs too. */
3222 }
3223 else if ((get_elf_i386_backend_data (output_bfd)->os
3224 == is_vxworks)
3225 && strcmp (p->sec->output_section->name,
3226 ".tls_vars") == 0)
3227 {
3228 /* Relocations in vxworks .tls_vars sections are
3229 handled specially by the loader. */
3230 }
3231 else if (p->count != 0)
3232 {
3233 srel = elf_section_data (p->sec)->sreloc;
3234 srel->size += p->count * sizeof (Elf32_External_Rel);
3235 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3236 && (info->flags & DF_TEXTREL) == 0)
3237 {
3238 info->flags |= DF_TEXTREL;
3239 if ((info->warn_shared_textrel && bfd_link_pic (info))
3240 || info->error_textrel)
3241 /* xgettext:c-format */
3242 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3243 p->sec->owner, p->sec);
3244 }
3245 }
3246 }
3247 }
3248
3249 local_got = elf_local_got_refcounts (ibfd);
3250 if (!local_got)
3251 continue;
3252
3253 symtab_hdr = &elf_symtab_hdr (ibfd);
3254 locsymcount = symtab_hdr->sh_info;
3255 end_local_got = local_got + locsymcount;
3256 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3257 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3258 s = htab->elf.sgot;
3259 srel = htab->elf.srelgot;
3260 for (; local_got < end_local_got;
3261 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3262 {
3263 *local_tlsdesc_gotent = (bfd_vma) -1;
3264 if (*local_got > 0)
3265 {
3266 if (GOT_TLS_GDESC_P (*local_tls_type))
3267 {
3268 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3269 - elf_i386_compute_jump_table_size (htab);
3270 htab->elf.sgotplt->size += 8;
3271 *local_got = (bfd_vma) -2;
3272 }
3273 if (! GOT_TLS_GDESC_P (*local_tls_type)
3274 || GOT_TLS_GD_P (*local_tls_type))
3275 {
3276 *local_got = s->size;
3277 s->size += 4;
3278 if (GOT_TLS_GD_P (*local_tls_type)
3279 || *local_tls_type == GOT_TLS_IE_BOTH)
3280 s->size += 4;
3281 }
3282 if (bfd_link_pic (info)
3283 || GOT_TLS_GD_ANY_P (*local_tls_type)
3284 || (*local_tls_type & GOT_TLS_IE))
3285 {
3286 if (*local_tls_type == GOT_TLS_IE_BOTH)
3287 srel->size += 2 * sizeof (Elf32_External_Rel);
3288 else if (GOT_TLS_GD_P (*local_tls_type)
3289 || ! GOT_TLS_GDESC_P (*local_tls_type))
3290 srel->size += sizeof (Elf32_External_Rel);
3291 if (GOT_TLS_GDESC_P (*local_tls_type))
3292 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3293 }
3294 }
3295 else
3296 *local_got = (bfd_vma) -1;
3297 }
3298 }
3299
3300 if (htab->tls_ldm_got.refcount > 0)
3301 {
3302 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3303 relocs. */
3304 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3305 htab->elf.sgot->size += 8;
3306 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3307 }
3308 else
3309 htab->tls_ldm_got.offset = -1;
3310
3311 /* Allocate global sym .plt and .got entries, and space for global
3312 sym dynamic relocs. */
3313 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3314
3315 /* Allocate .plt and .got entries, and space for local symbols. */
3316 htab_traverse (htab->loc_hash_table,
3317 elf_i386_allocate_local_dynrelocs,
3318 info);
3319
3320 /* For every jump slot reserved in the sgotplt, reloc_count is
3321 incremented. However, when we reserve space for TLS descriptors,
3322 it's not incremented, so in order to compute the space reserved
3323 for them, it suffices to multiply the reloc count by the jump
3324 slot size.
3325
3326 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3327 so that R_386_IRELATIVE entries come last. */
3328 if (htab->elf.srelplt)
3329 {
3330 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3331 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3332 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3333 }
3334 else if (htab->elf.irelplt)
3335 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3336
3337
3338 if (htab->elf.sgotplt)
3339 {
3340 /* Don't allocate .got.plt section if there are no GOT nor PLT
3341 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3342 if ((htab->elf.hgot == NULL
3343 || !htab->elf.hgot->ref_regular_nonweak)
3344 && (htab->elf.sgotplt->size
3345 == get_elf_backend_data (output_bfd)->got_header_size)
3346 && (htab->elf.splt == NULL
3347 || htab->elf.splt->size == 0)
3348 && (htab->elf.sgot == NULL
3349 || htab->elf.sgot->size == 0)
3350 && (htab->elf.iplt == NULL
3351 || htab->elf.iplt->size == 0)
3352 && (htab->elf.igotplt == NULL
3353 || htab->elf.igotplt->size == 0))
3354 htab->elf.sgotplt->size = 0;
3355 }
3356
3357 if (_bfd_elf_eh_frame_present (info))
3358 {
3359 if (htab->plt_eh_frame != NULL
3360 && htab->elf.splt != NULL
3361 && htab->elf.splt->size != 0
3362 && !bfd_is_abs_section (htab->elf.splt->output_section))
3363 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
3364
3365 if (htab->plt_got_eh_frame != NULL
3366 && htab->plt_got != NULL
3367 && htab->plt_got->size != 0
3368 && !bfd_is_abs_section (htab->plt_got->output_section))
3369 htab->plt_got_eh_frame->size
3370 = htab->non_lazy_plt->eh_frame_plt_size;
3371 }
3372
3373 /* We now have determined the sizes of the various dynamic sections.
3374 Allocate memory for them. */
3375 relocs = FALSE;
3376 for (s = dynobj->sections; s != NULL; s = s->next)
3377 {
3378 bfd_boolean strip_section = TRUE;
3379
3380 if ((s->flags & SEC_LINKER_CREATED) == 0)
3381 continue;
3382
3383 if (s == htab->elf.splt
3384 || s == htab->elf.sgot)
3385 {
3386 /* Strip this section if we don't need it; see the
3387 comment below. */
3388 /* We'd like to strip these sections if they aren't needed, but if
3389 we've exported dynamic symbols from them we must leave them.
3390 It's too late to tell BFD to get rid of the symbols. */
3391
3392 if (htab->elf.hplt != NULL)
3393 strip_section = FALSE;
3394 }
3395 else if (s == htab->elf.sgotplt
3396 || s == htab->elf.iplt
3397 || s == htab->elf.igotplt
3398 || s == htab->plt_got
3399 || s == htab->plt_eh_frame
3400 || s == htab->plt_got_eh_frame
3401 || s == htab->elf.sdynbss
3402 || s == htab->elf.sdynrelro)
3403 {
3404 /* Strip these too. */
3405 }
3406 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3407 {
3408 if (s->size != 0
3409 && s != htab->elf.srelplt
3410 && s != htab->srelplt2)
3411 relocs = TRUE;
3412
3413 /* We use the reloc_count field as a counter if we need
3414 to copy relocs into the output file. */
3415 s->reloc_count = 0;
3416 }
3417 else
3418 {
3419 /* It's not one of our sections, so don't allocate space. */
3420 continue;
3421 }
3422
3423 if (s->size == 0)
3424 {
3425 /* If we don't need this section, strip it from the
3426 output file. This is mostly to handle .rel.bss and
3427 .rel.plt. We must create both sections in
3428 create_dynamic_sections, because they must be created
3429 before the linker maps input sections to output
3430 sections. The linker does that before
3431 adjust_dynamic_symbol is called, and it is that
3432 function which decides whether anything needs to go
3433 into these sections. */
3434 if (strip_section)
3435 s->flags |= SEC_EXCLUDE;
3436 continue;
3437 }
3438
3439 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3440 continue;
3441
3442 /* Allocate memory for the section contents. We use bfd_zalloc
3443 here in case unused entries are not reclaimed before the
3444 section's contents are written out. This should not happen,
3445 but this way if it does, we get a R_386_NONE reloc instead
3446 of garbage. */
3447 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3448 if (s->contents == NULL)
3449 return FALSE;
3450 }
3451
3452 if (htab->plt_eh_frame != NULL
3453 && htab->plt_eh_frame->contents != NULL)
3454 {
3455 memcpy (htab->plt_eh_frame->contents,
3456 htab->plt.eh_frame_plt,
3457 htab->plt_eh_frame->size);
3458 bfd_put_32 (dynobj, htab->elf.splt->size,
3459 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3460 }
3461
3462 if (htab->plt_got_eh_frame != NULL
3463 && htab->plt_got_eh_frame->contents != NULL)
3464 {
3465 memcpy (htab->plt_got_eh_frame->contents,
3466 htab->non_lazy_plt->eh_frame_plt,
3467 htab->plt_got_eh_frame->size);
3468 bfd_put_32 (dynobj, htab->plt_got->size,
3469 (htab->plt_got_eh_frame->contents
3470 + PLT_FDE_LEN_OFFSET));
3471 }
3472
3473 if (htab->elf.dynamic_sections_created)
3474 {
3475 /* Add some entries to the .dynamic section. We fill in the
3476 values later, in elf_i386_finish_dynamic_sections, but we
3477 must add the entries now so that we get the correct size for
3478 the .dynamic section. The DT_DEBUG entry is filled in by the
3479 dynamic linker and used by the debugger. */
3480 #define add_dynamic_entry(TAG, VAL) \
3481 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3482
3483 if (bfd_link_executable (info))
3484 {
3485 if (!add_dynamic_entry (DT_DEBUG, 0))
3486 return FALSE;
3487 }
3488
3489 if (htab->elf.splt->size != 0)
3490 {
3491 /* DT_PLTGOT is used by prelink even if there is no PLT
3492 relocation. */
3493 if (!add_dynamic_entry (DT_PLTGOT, 0))
3494 return FALSE;
3495 }
3496
3497 if (htab->elf.srelplt->size != 0)
3498 {
3499 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3500 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3501 || !add_dynamic_entry (DT_JMPREL, 0))
3502 return FALSE;
3503 }
3504
3505 if (relocs)
3506 {
3507 if (!add_dynamic_entry (DT_REL, 0)
3508 || !add_dynamic_entry (DT_RELSZ, 0)
3509 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3510 return FALSE;
3511
3512 /* If any dynamic relocs apply to a read-only section,
3513 then we need a DT_TEXTREL entry. */
3514 if ((info->flags & DF_TEXTREL) == 0)
3515 elf_link_hash_traverse (&htab->elf,
3516 elf_i386_readonly_dynrelocs, info);
3517
3518 if ((info->flags & DF_TEXTREL) != 0)
3519 {
3520 if (htab->readonly_dynrelocs_against_ifunc)
3521 {
3522 info->callbacks->einfo
3523 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3524 bfd_set_error (bfd_error_bad_value);
3525 return FALSE;
3526 }
3527
3528 if (!add_dynamic_entry (DT_TEXTREL, 0))
3529 return FALSE;
3530 }
3531 }
3532 if (get_elf_i386_backend_data (output_bfd)->os == is_vxworks
3533 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3534 return FALSE;
3535 }
3536 #undef add_dynamic_entry
3537
3538 return TRUE;
3539 }
3540
3541 static bfd_boolean
3542 elf_i386_always_size_sections (bfd *output_bfd,
3543 struct bfd_link_info *info)
3544 {
3545 asection *tls_sec = elf_hash_table (info)->tls_sec;
3546
3547 if (tls_sec)
3548 {
3549 struct elf_link_hash_entry *tlsbase;
3550
3551 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3552 "_TLS_MODULE_BASE_",
3553 FALSE, FALSE, FALSE);
3554
3555 if (tlsbase && tlsbase->type == STT_TLS)
3556 {
3557 struct elf_i386_link_hash_table *htab;
3558 struct bfd_link_hash_entry *bh = NULL;
3559 const struct elf_backend_data *bed
3560 = get_elf_backend_data (output_bfd);
3561
3562 htab = elf_i386_hash_table (info);
3563 if (htab == NULL)
3564 return FALSE;
3565
3566 if (!(_bfd_generic_link_add_one_symbol
3567 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3568 tls_sec, 0, NULL, FALSE,
3569 bed->collect, &bh)))
3570 return FALSE;
3571
3572 htab->tls_module_base = bh;
3573
3574 tlsbase = (struct elf_link_hash_entry *)bh;
3575 tlsbase->def_regular = 1;
3576 tlsbase->other = STV_HIDDEN;
3577 tlsbase->root.linker_def = 1;
3578 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3579 }
3580 }
3581
3582 return TRUE;
3583 }
3584
3585 /* Set the correct type for an x86 ELF section. We do this by the
3586 section name, which is a hack, but ought to work. */
3587
3588 static bfd_boolean
3589 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3590 Elf_Internal_Shdr *hdr,
3591 asection *sec)
3592 {
3593 const char *name;
3594
3595 name = bfd_get_section_name (abfd, sec);
3596
3597 /* This is an ugly, but unfortunately necessary hack that is
3598 needed when producing EFI binaries on x86. It tells
3599 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3600 containing ELF relocation info. We need this hack in order to
3601 be able to generate ELF binaries that can be translated into
3602 EFI applications (which are essentially COFF objects). Those
3603 files contain a COFF ".reloc" section inside an ELFNN object,
3604 which would normally cause BFD to segfault because it would
3605 attempt to interpret this section as containing relocation
3606 entries for section "oc". With this hack enabled, ".reloc"
3607 will be treated as a normal data section, which will avoid the
3608 segfault. However, you won't be able to create an ELFNN binary
3609 with a section named "oc" that needs relocations, but that's
3610 the kind of ugly side-effects you get when detecting section
3611 types based on their names... In practice, this limitation is
3612 unlikely to bite. */
3613 if (strcmp (name, ".reloc") == 0)
3614 hdr->sh_type = SHT_PROGBITS;
3615
3616 return TRUE;
3617 }
3618
3619 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3620 executables. Rather than setting it to the beginning of the TLS
3621 section, we have to set it to the end. This function may be called
3622 multiple times, it is idempotent. */
3623
3624 static void
3625 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3626 {
3627 struct elf_i386_link_hash_table *htab;
3628 struct bfd_link_hash_entry *base;
3629
3630 if (!bfd_link_executable (info))
3631 return;
3632
3633 htab = elf_i386_hash_table (info);
3634 if (htab == NULL)
3635 return;
3636
3637 base = htab->tls_module_base;
3638 if (base == NULL)
3639 return;
3640
3641 base->u.def.value = htab->elf.tls_size;
3642 }
3643
3644 /* Return the base VMA address which should be subtracted from real addresses
3645 when resolving @dtpoff relocation.
3646 This is PT_TLS segment p_vaddr. */
3647
3648 static bfd_vma
3649 elf_i386_dtpoff_base (struct bfd_link_info *info)
3650 {
3651 /* If tls_sec is NULL, we should have signalled an error already. */
3652 if (elf_hash_table (info)->tls_sec == NULL)
3653 return 0;
3654 return elf_hash_table (info)->tls_sec->vma;
3655 }
3656
3657 /* Return the relocation value for @tpoff relocation
3658 if STT_TLS virtual address is ADDRESS. */
3659
3660 static bfd_vma
3661 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3662 {
3663 struct elf_link_hash_table *htab = elf_hash_table (info);
3664 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3665 bfd_vma static_tls_size;
3666
3667 /* If tls_sec is NULL, we should have signalled an error already. */
3668 if (htab->tls_sec == NULL)
3669 return 0;
3670
3671 /* Consider special static TLS alignment requirements. */
3672 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3673 return static_tls_size + htab->tls_sec->vma - address;
3674 }
3675
3676 /* Relocate an i386 ELF section. */
3677
3678 static bfd_boolean
3679 elf_i386_relocate_section (bfd *output_bfd,
3680 struct bfd_link_info *info,
3681 bfd *input_bfd,
3682 asection *input_section,
3683 bfd_byte *contents,
3684 Elf_Internal_Rela *relocs,
3685 Elf_Internal_Sym *local_syms,
3686 asection **local_sections)
3687 {
3688 struct elf_i386_link_hash_table *htab;
3689 Elf_Internal_Shdr *symtab_hdr;
3690 struct elf_link_hash_entry **sym_hashes;
3691 bfd_vma *local_got_offsets;
3692 bfd_vma *local_tlsdesc_gotents;
3693 Elf_Internal_Rela *rel;
3694 Elf_Internal_Rela *wrel;
3695 Elf_Internal_Rela *relend;
3696 bfd_boolean is_vxworks_tls;
3697 unsigned plt_entry_size;
3698
3699 BFD_ASSERT (is_i386_elf (input_bfd));
3700
3701 /* Skip if check_relocs failed. */
3702 if (input_section->check_relocs_failed)
3703 return FALSE;
3704
3705 htab = elf_i386_hash_table (info);
3706 if (htab == NULL)
3707 return FALSE;
3708 symtab_hdr = &elf_symtab_hdr (input_bfd);
3709 sym_hashes = elf_sym_hashes (input_bfd);
3710 local_got_offsets = elf_local_got_offsets (input_bfd);
3711 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3712 /* We have to handle relocations in vxworks .tls_vars sections
3713 specially, because the dynamic loader is 'weird'. */
3714 is_vxworks_tls = ((get_elf_i386_backend_data (output_bfd)->os
3715 == is_vxworks)
3716 && bfd_link_pic (info)
3717 && !strcmp (input_section->output_section->name,
3718 ".tls_vars"));
3719
3720 elf_i386_set_tls_module_base (info);
3721
3722 plt_entry_size = htab->plt.plt_entry_size;
3723
3724 rel = wrel = relocs;
3725 relend = relocs + input_section->reloc_count;
3726 for (; rel < relend; wrel++, rel++)
3727 {
3728 unsigned int r_type;
3729 reloc_howto_type *howto;
3730 unsigned long r_symndx;
3731 struct elf_link_hash_entry *h;
3732 struct elf_i386_link_hash_entry *eh;
3733 Elf_Internal_Sym *sym;
3734 asection *sec;
3735 bfd_vma off, offplt, plt_offset;
3736 bfd_vma relocation;
3737 bfd_boolean unresolved_reloc;
3738 bfd_reloc_status_type r;
3739 unsigned int indx;
3740 int tls_type;
3741 bfd_vma st_size;
3742 asection *resolved_plt;
3743 bfd_boolean resolved_to_zero;
3744 bfd_boolean relative_reloc;
3745
3746 r_type = ELF32_R_TYPE (rel->r_info);
3747 if (r_type == R_386_GNU_VTINHERIT
3748 || r_type == R_386_GNU_VTENTRY)
3749 {
3750 if (wrel != rel)
3751 *wrel = *rel;
3752 continue;
3753 }
3754
3755 if ((indx = r_type) >= R_386_standard
3756 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3757 >= R_386_ext - R_386_standard)
3758 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3759 >= R_386_ext2 - R_386_ext))
3760 {
3761 _bfd_error_handler
3762 /* xgettext:c-format */
3763 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3764 input_bfd, r_type, input_section);
3765 bfd_set_error (bfd_error_bad_value);
3766 return FALSE;
3767 }
3768 howto = elf_howto_table + indx;
3769
3770 r_symndx = ELF32_R_SYM (rel->r_info);
3771 h = NULL;
3772 sym = NULL;
3773 sec = NULL;
3774 unresolved_reloc = FALSE;
3775 if (r_symndx < symtab_hdr->sh_info)
3776 {
3777 sym = local_syms + r_symndx;
3778 sec = local_sections[r_symndx];
3779 relocation = (sec->output_section->vma
3780 + sec->output_offset
3781 + sym->st_value);
3782 st_size = sym->st_size;
3783
3784 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3785 && ((sec->flags & SEC_MERGE) != 0
3786 || (bfd_link_relocatable (info)
3787 && sec->output_offset != 0)))
3788 {
3789 bfd_vma addend;
3790 bfd_byte *where = contents + rel->r_offset;
3791
3792 switch (howto->size)
3793 {
3794 case 0:
3795 addend = bfd_get_8 (input_bfd, where);
3796 if (howto->pc_relative)
3797 {
3798 addend = (addend ^ 0x80) - 0x80;
3799 addend += 1;
3800 }
3801 break;
3802 case 1:
3803 addend = bfd_get_16 (input_bfd, where);
3804 if (howto->pc_relative)
3805 {
3806 addend = (addend ^ 0x8000) - 0x8000;
3807 addend += 2;
3808 }
3809 break;
3810 case 2:
3811 addend = bfd_get_32 (input_bfd, where);
3812 if (howto->pc_relative)
3813 {
3814 addend = (addend ^ 0x80000000) - 0x80000000;
3815 addend += 4;
3816 }
3817 break;
3818 default:
3819 abort ();
3820 }
3821
3822 if (bfd_link_relocatable (info))
3823 addend += sec->output_offset;
3824 else
3825 {
3826 asection *msec = sec;
3827 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3828 addend);
3829 addend -= relocation;
3830 addend += msec->output_section->vma + msec->output_offset;
3831 }
3832
3833 switch (howto->size)
3834 {
3835 case 0:
3836 /* FIXME: overflow checks. */
3837 if (howto->pc_relative)
3838 addend -= 1;
3839 bfd_put_8 (input_bfd, addend, where);
3840 break;
3841 case 1:
3842 if (howto->pc_relative)
3843 addend -= 2;
3844 bfd_put_16 (input_bfd, addend, where);
3845 break;
3846 case 2:
3847 if (howto->pc_relative)
3848 addend -= 4;
3849 bfd_put_32 (input_bfd, addend, where);
3850 break;
3851 }
3852 }
3853 else if (!bfd_link_relocatable (info)
3854 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3855 {
3856 /* Relocate against local STT_GNU_IFUNC symbol. */
3857 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3858 FALSE);
3859 if (h == NULL)
3860 abort ();
3861
3862 /* Set STT_GNU_IFUNC symbol value. */
3863 h->root.u.def.value = sym->st_value;
3864 h->root.u.def.section = sec;
3865 }
3866 }
3867 else
3868 {
3869 bfd_boolean warned ATTRIBUTE_UNUSED;
3870 bfd_boolean ignored ATTRIBUTE_UNUSED;
3871
3872 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3873 r_symndx, symtab_hdr, sym_hashes,
3874 h, sec, relocation,
3875 unresolved_reloc, warned, ignored);
3876 st_size = h->size;
3877 }
3878
3879 if (sec != NULL && discarded_section (sec))
3880 {
3881 _bfd_clear_contents (howto, input_bfd, input_section,
3882 contents + rel->r_offset);
3883 wrel->r_offset = rel->r_offset;
3884 wrel->r_info = 0;
3885 wrel->r_addend = 0;
3886
3887 /* For ld -r, remove relocations in debug sections against
3888 sections defined in discarded sections. Not done for
3889 eh_frame editing code expects to be present. */
3890 if (bfd_link_relocatable (info)
3891 && (input_section->flags & SEC_DEBUGGING))
3892 wrel--;
3893
3894 continue;
3895 }
3896
3897 if (bfd_link_relocatable (info))
3898 {
3899 if (wrel != rel)
3900 *wrel = *rel;
3901 continue;
3902 }
3903
3904 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3905 it here if it is defined in a non-shared object. */
3906 if (h != NULL
3907 && h->type == STT_GNU_IFUNC
3908 && h->def_regular)
3909 {
3910 asection *plt, *gotplt, *base_got;
3911 bfd_vma plt_index;
3912 const char *name;
3913
3914 if ((input_section->flags & SEC_ALLOC) == 0)
3915 {
3916 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3917 sections because such sections are not SEC_ALLOC and
3918 thus ld.so will not process them. */
3919 if ((input_section->flags & SEC_DEBUGGING) != 0)
3920 continue;
3921 abort ();
3922 }
3923
3924 /* STT_GNU_IFUNC symbol must go through PLT. */
3925 if (htab->elf.splt != NULL)
3926 {
3927 plt = htab->elf.splt;
3928 gotplt = htab->elf.sgotplt;
3929 }
3930 else
3931 {
3932 plt = htab->elf.iplt;
3933 gotplt = htab->elf.igotplt;
3934 }
3935
3936 switch (r_type)
3937 {
3938 default:
3939 break;
3940
3941 case R_386_GOT32:
3942 case R_386_GOT32X:
3943 base_got = htab->elf.sgot;
3944 off = h->got.offset;
3945
3946 if (base_got == NULL)
3947 abort ();
3948
3949 if (off == (bfd_vma) -1)
3950 {
3951 /* We can't use h->got.offset here to save state, or
3952 even just remember the offset, as finish_dynamic_symbol
3953 would use that as offset into .got. */
3954
3955 if (h->plt.offset == (bfd_vma) -1)
3956 abort ();
3957
3958 if (htab->elf.splt != NULL)
3959 {
3960 plt_index = (h->plt.offset / plt_entry_size
3961 - htab->plt.has_plt0);
3962 off = (plt_index + 3) * 4;
3963 base_got = htab->elf.sgotplt;
3964 }
3965 else
3966 {
3967 plt_index = h->plt.offset / plt_entry_size;
3968 off = plt_index * 4;
3969 base_got = htab->elf.igotplt;
3970 }
3971
3972 if (h->dynindx == -1
3973 || h->forced_local
3974 || info->symbolic)
3975 {
3976 /* This references the local defitionion. We must
3977 initialize this entry in the global offset table.
3978 Since the offset must always be a multiple of 8,
3979 we use the least significant bit to record
3980 whether we have initialized it already.
3981
3982 When doing a dynamic link, we create a .rela.got
3983 relocation entry to initialize the value. This
3984 is done in the finish_dynamic_symbol routine. */
3985 if ((off & 1) != 0)
3986 off &= ~1;
3987 else
3988 {
3989 bfd_put_32 (output_bfd, relocation,
3990 base_got->contents + off);
3991 h->got.offset |= 1;
3992 }
3993 }
3994
3995 relocation = off;
3996 }
3997 else
3998 relocation = (base_got->output_section->vma
3999 + base_got->output_offset + off
4000 - gotplt->output_section->vma
4001 - gotplt->output_offset);
4002
4003 if (rel->r_offset > 1
4004 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4005 && *(contents + rel->r_offset - 2) != 0x8d)
4006 {
4007 if (bfd_link_pic (info))
4008 goto disallow_got32;
4009
4010 /* Add the GOT base if there is no base register. */
4011 relocation += (gotplt->output_section->vma
4012 + gotplt->output_offset);
4013 }
4014 else if (htab->elf.splt == NULL)
4015 {
4016 /* Adjust for static executables. */
4017 relocation += gotplt->output_offset;
4018 }
4019
4020 goto do_relocation;
4021 }
4022
4023 if (h->plt.offset == (bfd_vma) -1)
4024 {
4025 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4026 if (r_type == R_386_32
4027 && (input_section->flags & SEC_CODE) == 0)
4028 goto do_ifunc_pointer;
4029 goto bad_ifunc_reloc;
4030 }
4031
4032 relocation = (plt->output_section->vma
4033 + plt->output_offset + h->plt.offset);
4034
4035 switch (r_type)
4036 {
4037 default:
4038 bad_ifunc_reloc:
4039 if (h->root.root.string)
4040 name = h->root.root.string;
4041 else
4042 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4043 NULL);
4044 _bfd_error_handler
4045 /* xgettext:c-format */
4046 (_("%B: relocation %s against STT_GNU_IFUNC "
4047 "symbol `%s' isn't supported"), input_bfd,
4048 howto->name, name);
4049 bfd_set_error (bfd_error_bad_value);
4050 return FALSE;
4051
4052 case R_386_32:
4053 /* Generate dynamic relcoation only when there is a
4054 non-GOT reference in a shared object. */
4055 if ((bfd_link_pic (info) && h->non_got_ref)
4056 || h->plt.offset == (bfd_vma) -1)
4057 {
4058 Elf_Internal_Rela outrel;
4059 asection *sreloc;
4060 bfd_vma offset;
4061
4062 do_ifunc_pointer:
4063 /* Need a dynamic relocation to get the real function
4064 adddress. */
4065 offset = _bfd_elf_section_offset (output_bfd,
4066 info,
4067 input_section,
4068 rel->r_offset);
4069 if (offset == (bfd_vma) -1
4070 || offset == (bfd_vma) -2)
4071 abort ();
4072
4073 outrel.r_offset = (input_section->output_section->vma
4074 + input_section->output_offset
4075 + offset);
4076
4077 if (h->dynindx == -1
4078 || h->forced_local
4079 || bfd_link_executable (info))
4080 {
4081 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
4082 h->root.root.string,
4083 h->root.u.def.section->owner);
4084
4085 /* This symbol is resolved locally. */
4086 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4087 bfd_put_32 (output_bfd,
4088 (h->root.u.def.value
4089 + h->root.u.def.section->output_section->vma
4090 + h->root.u.def.section->output_offset),
4091 contents + offset);
4092 }
4093 else
4094 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4095
4096 /* Dynamic relocations are stored in
4097 1. .rel.ifunc section in PIC object.
4098 2. .rel.got section in dynamic executable.
4099 3. .rel.iplt section in static executable. */
4100 if (bfd_link_pic (info))
4101 sreloc = htab->elf.irelifunc;
4102 else if (htab->elf.splt != NULL)
4103 sreloc = htab->elf.srelgot;
4104 else
4105 sreloc = htab->elf.irelplt;
4106 elf_append_rel (output_bfd, sreloc, &outrel);
4107
4108 /* If this reloc is against an external symbol, we
4109 do not want to fiddle with the addend. Otherwise,
4110 we need to include the symbol value so that it
4111 becomes an addend for the dynamic reloc. For an
4112 internal symbol, we have updated addend. */
4113 continue;
4114 }
4115 /* FALLTHROUGH */
4116 case R_386_PC32:
4117 case R_386_PLT32:
4118 goto do_relocation;
4119
4120 case R_386_GOTOFF:
4121 relocation -= (gotplt->output_section->vma
4122 + gotplt->output_offset);
4123 goto do_relocation;
4124 }
4125 }
4126
4127 eh = (struct elf_i386_link_hash_entry *) h;
4128 resolved_to_zero = (eh != NULL
4129 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4130 eh->has_got_reloc,
4131 eh));
4132
4133 switch (r_type)
4134 {
4135 case R_386_GOT32X:
4136 /* Avoid optimizing _DYNAMIC since ld.so may use its
4137 link-time address. */
4138 if (h == htab->elf.hdynamic)
4139 goto r_386_got32;
4140
4141 if (bfd_link_pic (info))
4142 {
4143 /* It is OK to convert mov to lea and convert indirect
4144 branch to direct branch. It is OK to convert adc,
4145 add, and, cmp, or, sbb, sub, test, xor only when PIC
4146 is false. */
4147 unsigned int opcode, addend;
4148 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4149 if (addend != 0)
4150 goto r_386_got32;
4151 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4152 if (opcode != 0x8b && opcode != 0xff)
4153 goto r_386_got32;
4154 }
4155
4156 /* Resolve "mov GOT[(%reg)], %reg",
4157 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4158 and "binop foo@GOT[(%reg)], %reg". */
4159 if (h == NULL
4160 || (h->plt.offset == (bfd_vma) -1
4161 && h->got.offset == (bfd_vma) -1)
4162 || htab->elf.sgotplt == NULL)
4163 abort ();
4164
4165 offplt = (htab->elf.sgotplt->output_section->vma
4166 + htab->elf.sgotplt->output_offset);
4167
4168 /* It is relative to .got.plt section. */
4169 if (h->got.offset != (bfd_vma) -1)
4170 /* Use GOT entry. Mask off the least significant bit in
4171 GOT offset which may be set by R_386_GOT32 processing
4172 below. */
4173 relocation = (htab->elf.sgot->output_section->vma
4174 + htab->elf.sgot->output_offset
4175 + (h->got.offset & ~1) - offplt);
4176 else
4177 /* Use GOTPLT entry. */
4178 relocation = (h->plt.offset / plt_entry_size
4179 - htab->plt.has_plt0 + 3) * 4;
4180
4181 if (!bfd_link_pic (info))
4182 {
4183 /* If not PIC, add the .got.plt section address for
4184 baseless addressing. */
4185 unsigned int modrm;
4186 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4187 if ((modrm & 0xc7) == 0x5)
4188 relocation += offplt;
4189 }
4190
4191 unresolved_reloc = FALSE;
4192 break;
4193
4194 case R_386_GOT32:
4195 r_386_got32:
4196 /* Relocation is to the entry for this symbol in the global
4197 offset table. */
4198 if (htab->elf.sgot == NULL)
4199 abort ();
4200
4201 relative_reloc = FALSE;
4202 if (h != NULL)
4203 {
4204 bfd_boolean dyn;
4205
4206 off = h->got.offset;
4207 dyn = htab->elf.dynamic_sections_created;
4208 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4209 bfd_link_pic (info),
4210 h)
4211 || (bfd_link_pic (info)
4212 && SYMBOL_REFERENCES_LOCAL (info, h))
4213 || (ELF_ST_VISIBILITY (h->other)
4214 && h->root.type == bfd_link_hash_undefweak))
4215 {
4216 /* This is actually a static link, or it is a
4217 -Bsymbolic link and the symbol is defined
4218 locally, or the symbol was forced to be local
4219 because of a version file. We must initialize
4220 this entry in the global offset table. Since the
4221 offset must always be a multiple of 4, we use the
4222 least significant bit to record whether we have
4223 initialized it already.
4224
4225 When doing a dynamic link, we create a .rel.got
4226 relocation entry to initialize the value. This
4227 is done in the finish_dynamic_symbol routine. */
4228 if ((off & 1) != 0)
4229 off &= ~1;
4230 else
4231 {
4232 bfd_put_32 (output_bfd, relocation,
4233 htab->elf.sgot->contents + off);
4234 h->got.offset |= 1;
4235
4236 if (h->dynindx == -1
4237 && !h->forced_local
4238 && h->root.type != bfd_link_hash_undefweak
4239 && bfd_link_pic (info))
4240 {
4241 /* PR ld/21402: If this symbol isn't dynamic
4242 in PIC, generate R_386_RELATIVE here. */
4243 eh->no_finish_dynamic_symbol = 1;
4244 relative_reloc = TRUE;
4245 }
4246 }
4247 }
4248 else
4249 unresolved_reloc = FALSE;
4250 }
4251 else
4252 {
4253 if (local_got_offsets == NULL)
4254 abort ();
4255
4256 off = local_got_offsets[r_symndx];
4257
4258 /* The offset must always be a multiple of 4. We use
4259 the least significant bit to record whether we have
4260 already generated the necessary reloc. */
4261 if ((off & 1) != 0)
4262 off &= ~1;
4263 else
4264 {
4265 bfd_put_32 (output_bfd, relocation,
4266 htab->elf.sgot->contents + off);
4267 local_got_offsets[r_symndx] |= 1;
4268
4269 if (bfd_link_pic (info))
4270 relative_reloc = TRUE;
4271 }
4272 }
4273
4274 if (relative_reloc)
4275 {
4276 asection *s;
4277 Elf_Internal_Rela outrel;
4278
4279 s = htab->elf.srelgot;
4280 if (s == NULL)
4281 abort ();
4282
4283 outrel.r_offset = (htab->elf.sgot->output_section->vma
4284 + htab->elf.sgot->output_offset
4285 + off);
4286 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4287 elf_append_rel (output_bfd, s, &outrel);
4288 }
4289
4290 if (off >= (bfd_vma) -2)
4291 abort ();
4292
4293 relocation = (htab->elf.sgot->output_section->vma
4294 + htab->elf.sgot->output_offset + off);
4295 if (rel->r_offset > 1
4296 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4297 && *(contents + rel->r_offset - 2) != 0x8d)
4298 {
4299 if (bfd_link_pic (info))
4300 {
4301 /* For PIC, disallow R_386_GOT32 without a base
4302 register, except for "lea foo@GOT, %reg", since
4303 we don't know what the GOT base is. */
4304 const char *name;
4305
4306 disallow_got32:
4307 if (h == NULL || h->root.root.string == NULL)
4308 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4309 NULL);
4310 else
4311 name = h->root.root.string;
4312
4313 _bfd_error_handler
4314 /* xgettext:c-format */
4315 (_("%B: direct GOT relocation %s against `%s'"
4316 " without base register can not be used"
4317 " when making a shared object"),
4318 input_bfd, howto->name, name);
4319 bfd_set_error (bfd_error_bad_value);
4320 return FALSE;
4321 }
4322 }
4323 else
4324 {
4325 /* Subtract the .got.plt section address only with a base
4326 register. */
4327 relocation -= (htab->elf.sgotplt->output_section->vma
4328 + htab->elf.sgotplt->output_offset);
4329 }
4330
4331 break;
4332
4333 case R_386_GOTOFF:
4334 /* Relocation is relative to the start of the global offset
4335 table. */
4336
4337 /* Check to make sure it isn't a protected function or data
4338 symbol for shared library since it may not be local when
4339 used as function address or with copy relocation. We also
4340 need to make sure that a symbol is referenced locally. */
4341 if (!bfd_link_executable (info) && h)
4342 {
4343 if (!h->def_regular)
4344 {
4345 const char *v;
4346
4347 switch (ELF_ST_VISIBILITY (h->other))
4348 {
4349 case STV_HIDDEN:
4350 v = _("hidden symbol");
4351 break;
4352 case STV_INTERNAL:
4353 v = _("internal symbol");
4354 break;
4355 case STV_PROTECTED:
4356 v = _("protected symbol");
4357 break;
4358 default:
4359 v = _("symbol");
4360 break;
4361 }
4362
4363 _bfd_error_handler
4364 /* xgettext:c-format */
4365 (_("%B: relocation R_386_GOTOFF against undefined %s"
4366 " `%s' can not be used when making a shared object"),
4367 input_bfd, v, h->root.root.string);
4368 bfd_set_error (bfd_error_bad_value);
4369 return FALSE;
4370 }
4371 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4372 && (h->type == STT_FUNC
4373 || h->type == STT_OBJECT)
4374 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4375 {
4376 _bfd_error_handler
4377 /* xgettext:c-format */
4378 (_("%B: relocation R_386_GOTOFF against protected %s"
4379 " `%s' can not be used when making a shared object"),
4380 input_bfd,
4381 h->type == STT_FUNC ? "function" : "data",
4382 h->root.root.string);
4383 bfd_set_error (bfd_error_bad_value);
4384 return FALSE;
4385 }
4386 }
4387
4388 /* Note that sgot is not involved in this
4389 calculation. We always want the start of .got.plt. If we
4390 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4391 permitted by the ABI, we might have to change this
4392 calculation. */
4393 relocation -= htab->elf.sgotplt->output_section->vma
4394 + htab->elf.sgotplt->output_offset;
4395 break;
4396
4397 case R_386_GOTPC:
4398 /* Use global offset table as symbol value. */
4399 relocation = htab->elf.sgotplt->output_section->vma
4400 + htab->elf.sgotplt->output_offset;
4401 unresolved_reloc = FALSE;
4402 break;
4403
4404 case R_386_PLT32:
4405 /* Relocation is to the entry for this symbol in the
4406 procedure linkage table. */
4407
4408 /* Resolve a PLT32 reloc against a local symbol directly,
4409 without using the procedure linkage table. */
4410 if (h == NULL)
4411 break;
4412
4413 if ((h->plt.offset == (bfd_vma) -1
4414 && eh->plt_got.offset == (bfd_vma) -1)
4415 || htab->elf.splt == NULL)
4416 {
4417 /* We didn't make a PLT entry for this symbol. This
4418 happens when statically linking PIC code, or when
4419 using -Bsymbolic. */
4420 break;
4421 }
4422
4423 if (h->plt.offset != (bfd_vma) -1)
4424 {
4425 resolved_plt = htab->elf.splt;
4426 plt_offset = h->plt.offset;
4427 }
4428 else
4429 {
4430 resolved_plt = htab->plt_got;
4431 plt_offset = eh->plt_got.offset;
4432 }
4433
4434 relocation = (resolved_plt->output_section->vma
4435 + resolved_plt->output_offset
4436 + plt_offset);
4437 unresolved_reloc = FALSE;
4438 break;
4439
4440 case R_386_SIZE32:
4441 /* Set to symbol size. */
4442 relocation = st_size;
4443 /* Fall through. */
4444
4445 case R_386_32:
4446 case R_386_PC32:
4447 if ((input_section->flags & SEC_ALLOC) == 0
4448 || is_vxworks_tls)
4449 break;
4450
4451 /* Copy dynamic function pointer relocations. Don't generate
4452 dynamic relocations against resolved undefined weak symbols
4453 in PIE, except for R_386_PC32. */
4454 if ((bfd_link_pic (info)
4455 && (h == NULL
4456 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4457 && (!resolved_to_zero
4458 || r_type == R_386_PC32))
4459 || h->root.type != bfd_link_hash_undefweak))
4460 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4461 || !SYMBOL_CALLS_LOCAL (info, h)))
4462 || (ELIMINATE_COPY_RELOCS
4463 && !bfd_link_pic (info)
4464 && h != NULL
4465 && h->dynindx != -1
4466 && (!h->non_got_ref
4467 || eh->func_pointer_refcount > 0
4468 || (h->root.type == bfd_link_hash_undefweak
4469 && !resolved_to_zero))
4470 && ((h->def_dynamic && !h->def_regular)
4471 /* Undefined weak symbol is bound locally when
4472 PIC is false. */
4473 || h->root.type == bfd_link_hash_undefweak)))
4474 {
4475 Elf_Internal_Rela outrel;
4476 bfd_boolean skip, relocate;
4477 asection *sreloc;
4478
4479 /* When generating a shared object, these relocations
4480 are copied into the output file to be resolved at run
4481 time. */
4482
4483 skip = FALSE;
4484 relocate = FALSE;
4485
4486 outrel.r_offset =
4487 _bfd_elf_section_offset (output_bfd, info, input_section,
4488 rel->r_offset);
4489 if (outrel.r_offset == (bfd_vma) -1)
4490 skip = TRUE;
4491 else if (outrel.r_offset == (bfd_vma) -2)
4492 skip = TRUE, relocate = TRUE;
4493 outrel.r_offset += (input_section->output_section->vma
4494 + input_section->output_offset);
4495
4496 if (skip)
4497 memset (&outrel, 0, sizeof outrel);
4498 else if (h != NULL
4499 && h->dynindx != -1
4500 && (r_type == R_386_PC32
4501 || !(bfd_link_executable (info)
4502 || SYMBOLIC_BIND (info, h))
4503 || !h->def_regular))
4504 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4505 else
4506 {
4507 /* This symbol is local, or marked to become local. */
4508 relocate = TRUE;
4509 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4510 }
4511
4512 sreloc = elf_section_data (input_section)->sreloc;
4513
4514 if (sreloc == NULL || sreloc->contents == NULL)
4515 {
4516 r = bfd_reloc_notsupported;
4517 goto check_relocation_error;
4518 }
4519
4520 elf_append_rel (output_bfd, sreloc, &outrel);
4521
4522 /* If this reloc is against an external symbol, we do
4523 not want to fiddle with the addend. Otherwise, we
4524 need to include the symbol value so that it becomes
4525 an addend for the dynamic reloc. */
4526 if (! relocate)
4527 continue;
4528 }
4529 break;
4530
4531 case R_386_TLS_IE:
4532 if (!bfd_link_executable (info))
4533 {
4534 Elf_Internal_Rela outrel;
4535 asection *sreloc;
4536
4537 outrel.r_offset = rel->r_offset
4538 + input_section->output_section->vma
4539 + input_section->output_offset;
4540 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4541 sreloc = elf_section_data (input_section)->sreloc;
4542 if (sreloc == NULL)
4543 abort ();
4544 elf_append_rel (output_bfd, sreloc, &outrel);
4545 }
4546 /* Fall through */
4547
4548 case R_386_TLS_GD:
4549 case R_386_TLS_GOTDESC:
4550 case R_386_TLS_DESC_CALL:
4551 case R_386_TLS_IE_32:
4552 case R_386_TLS_GOTIE:
4553 tls_type = GOT_UNKNOWN;
4554 if (h == NULL && local_got_offsets)
4555 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4556 else if (h != NULL)
4557 tls_type = elf_i386_hash_entry(h)->tls_type;
4558 if (tls_type == GOT_TLS_IE)
4559 tls_type = GOT_TLS_IE_NEG;
4560
4561 if (! elf_i386_tls_transition (info, input_bfd,
4562 input_section, contents,
4563 symtab_hdr, sym_hashes,
4564 &r_type, tls_type, rel,
4565 relend, h, r_symndx, TRUE))
4566 return FALSE;
4567
4568 if (r_type == R_386_TLS_LE_32)
4569 {
4570 BFD_ASSERT (! unresolved_reloc);
4571 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4572 {
4573 unsigned int type;
4574 bfd_vma roff;
4575
4576 /* GD->LE transition. */
4577 type = *(contents + rel->r_offset - 2);
4578 if (type == 0x04)
4579 {
4580 /* Change
4581 leal foo@tlsgd(,%ebx,1), %eax
4582 call ___tls_get_addr@PLT
4583 into:
4584 movl %gs:0, %eax
4585 subl $foo@tpoff, %eax
4586 (6 byte form of subl). */
4587 roff = rel->r_offset + 5;
4588 }
4589 else
4590 {
4591 /* Change
4592 leal foo@tlsgd(%ebx), %eax
4593 call ___tls_get_addr@PLT
4594 nop
4595 or
4596 leal foo@tlsgd(%reg), %eax
4597 call *___tls_get_addr@GOT(%reg)
4598 which may be converted to
4599 addr32 call ___tls_get_addr
4600 into:
4601 movl %gs:0, %eax; subl $foo@tpoff, %eax
4602 (6 byte form of subl). */
4603 roff = rel->r_offset + 6;
4604 }
4605 memcpy (contents + roff - 8,
4606 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4607 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4608 contents + roff);
4609 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4610 rel++;
4611 wrel++;
4612 continue;
4613 }
4614 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4615 {
4616 /* GDesc -> LE transition.
4617 It's originally something like:
4618 leal x@tlsdesc(%ebx), %eax
4619
4620 leal x@ntpoff, %eax
4621
4622 Registers other than %eax may be set up here. */
4623
4624 unsigned int val;
4625 bfd_vma roff;
4626
4627 roff = rel->r_offset;
4628 val = bfd_get_8 (input_bfd, contents + roff - 1);
4629
4630 /* Now modify the instruction as appropriate. */
4631 /* aoliva FIXME: remove the above and xor the byte
4632 below with 0x86. */
4633 bfd_put_8 (output_bfd, val ^ 0x86,
4634 contents + roff - 1);
4635 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4636 contents + roff);
4637 continue;
4638 }
4639 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4640 {
4641 /* GDesc -> LE transition.
4642 It's originally:
4643 call *(%eax)
4644 Turn it into:
4645 xchg %ax,%ax */
4646
4647 bfd_vma roff;
4648
4649 roff = rel->r_offset;
4650 bfd_put_8 (output_bfd, 0x66, contents + roff);
4651 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4652 continue;
4653 }
4654 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4655 {
4656 unsigned int val;
4657
4658 /* IE->LE transition:
4659 Originally it can be one of:
4660 movl foo, %eax
4661 movl foo, %reg
4662 addl foo, %reg
4663 We change it into:
4664 movl $foo, %eax
4665 movl $foo, %reg
4666 addl $foo, %reg. */
4667 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4668 if (val == 0xa1)
4669 {
4670 /* movl foo, %eax. */
4671 bfd_put_8 (output_bfd, 0xb8,
4672 contents + rel->r_offset - 1);
4673 }
4674 else
4675 {
4676 unsigned int type;
4677
4678 type = bfd_get_8 (input_bfd,
4679 contents + rel->r_offset - 2);
4680 switch (type)
4681 {
4682 case 0x8b:
4683 /* movl */
4684 bfd_put_8 (output_bfd, 0xc7,
4685 contents + rel->r_offset - 2);
4686 bfd_put_8 (output_bfd,
4687 0xc0 | ((val >> 3) & 7),
4688 contents + rel->r_offset - 1);
4689 break;
4690 case 0x03:
4691 /* addl */
4692 bfd_put_8 (output_bfd, 0x81,
4693 contents + rel->r_offset - 2);
4694 bfd_put_8 (output_bfd,
4695 0xc0 | ((val >> 3) & 7),
4696 contents + rel->r_offset - 1);
4697 break;
4698 default:
4699 BFD_FAIL ();
4700 break;
4701 }
4702 }
4703 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4704 contents + rel->r_offset);
4705 continue;
4706 }
4707 else
4708 {
4709 unsigned int val, type;
4710
4711 /* {IE_32,GOTIE}->LE transition:
4712 Originally it can be one of:
4713 subl foo(%reg1), %reg2
4714 movl foo(%reg1), %reg2
4715 addl foo(%reg1), %reg2
4716 We change it into:
4717 subl $foo, %reg2
4718 movl $foo, %reg2 (6 byte form)
4719 addl $foo, %reg2. */
4720 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4721 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4722 if (type == 0x8b)
4723 {
4724 /* movl */
4725 bfd_put_8 (output_bfd, 0xc7,
4726 contents + rel->r_offset - 2);
4727 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4728 contents + rel->r_offset - 1);
4729 }
4730 else if (type == 0x2b)
4731 {
4732 /* subl */
4733 bfd_put_8 (output_bfd, 0x81,
4734 contents + rel->r_offset - 2);
4735 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4736 contents + rel->r_offset - 1);
4737 }
4738 else if (type == 0x03)
4739 {
4740 /* addl */
4741 bfd_put_8 (output_bfd, 0x81,
4742 contents + rel->r_offset - 2);
4743 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4744 contents + rel->r_offset - 1);
4745 }
4746 else
4747 BFD_FAIL ();
4748 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4749 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4750 contents + rel->r_offset);
4751 else
4752 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4753 contents + rel->r_offset);
4754 continue;
4755 }
4756 }
4757
4758 if (htab->elf.sgot == NULL)
4759 abort ();
4760
4761 if (h != NULL)
4762 {
4763 off = h->got.offset;
4764 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4765 }
4766 else
4767 {
4768 if (local_got_offsets == NULL)
4769 abort ();
4770
4771 off = local_got_offsets[r_symndx];
4772 offplt = local_tlsdesc_gotents[r_symndx];
4773 }
4774
4775 if ((off & 1) != 0)
4776 off &= ~1;
4777 else
4778 {
4779 Elf_Internal_Rela outrel;
4780 int dr_type;
4781 asection *sreloc;
4782
4783 if (htab->elf.srelgot == NULL)
4784 abort ();
4785
4786 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4787
4788 if (GOT_TLS_GDESC_P (tls_type))
4789 {
4790 bfd_byte *loc;
4791 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4792 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4793 <= htab->elf.sgotplt->size);
4794 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4795 + htab->elf.sgotplt->output_offset
4796 + offplt
4797 + htab->sgotplt_jump_table_size);
4798 sreloc = htab->elf.srelplt;
4799 loc = sreloc->contents;
4800 loc += (htab->next_tls_desc_index++
4801 * sizeof (Elf32_External_Rel));
4802 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4803 <= sreloc->contents + sreloc->size);
4804 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4805 if (indx == 0)
4806 {
4807 BFD_ASSERT (! unresolved_reloc);
4808 bfd_put_32 (output_bfd,
4809 relocation - elf_i386_dtpoff_base (info),
4810 htab->elf.sgotplt->contents + offplt
4811 + htab->sgotplt_jump_table_size + 4);
4812 }
4813 else
4814 {
4815 bfd_put_32 (output_bfd, 0,
4816 htab->elf.sgotplt->contents + offplt
4817 + htab->sgotplt_jump_table_size + 4);
4818 }
4819 }
4820
4821 sreloc = htab->elf.srelgot;
4822
4823 outrel.r_offset = (htab->elf.sgot->output_section->vma
4824 + htab->elf.sgot->output_offset + off);
4825
4826 if (GOT_TLS_GD_P (tls_type))
4827 dr_type = R_386_TLS_DTPMOD32;
4828 else if (GOT_TLS_GDESC_P (tls_type))
4829 goto dr_done;
4830 else if (tls_type == GOT_TLS_IE_POS)
4831 dr_type = R_386_TLS_TPOFF;
4832 else
4833 dr_type = R_386_TLS_TPOFF32;
4834
4835 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4836 bfd_put_32 (output_bfd,
4837 relocation - elf_i386_dtpoff_base (info),
4838 htab->elf.sgot->contents + off);
4839 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4840 bfd_put_32 (output_bfd,
4841 elf_i386_dtpoff_base (info) - relocation,
4842 htab->elf.sgot->contents + off);
4843 else if (dr_type != R_386_TLS_DESC)
4844 bfd_put_32 (output_bfd, 0,
4845 htab->elf.sgot->contents + off);
4846 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4847
4848 elf_append_rel (output_bfd, sreloc, &outrel);
4849
4850 if (GOT_TLS_GD_P (tls_type))
4851 {
4852 if (indx == 0)
4853 {
4854 BFD_ASSERT (! unresolved_reloc);
4855 bfd_put_32 (output_bfd,
4856 relocation - elf_i386_dtpoff_base (info),
4857 htab->elf.sgot->contents + off + 4);
4858 }
4859 else
4860 {
4861 bfd_put_32 (output_bfd, 0,
4862 htab->elf.sgot->contents + off + 4);
4863 outrel.r_info = ELF32_R_INFO (indx,
4864 R_386_TLS_DTPOFF32);
4865 outrel.r_offset += 4;
4866 elf_append_rel (output_bfd, sreloc, &outrel);
4867 }
4868 }
4869 else if (tls_type == GOT_TLS_IE_BOTH)
4870 {
4871 bfd_put_32 (output_bfd,
4872 (indx == 0
4873 ? relocation - elf_i386_dtpoff_base (info)
4874 : 0),
4875 htab->elf.sgot->contents + off + 4);
4876 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4877 outrel.r_offset += 4;
4878 elf_append_rel (output_bfd, sreloc, &outrel);
4879 }
4880
4881 dr_done:
4882 if (h != NULL)
4883 h->got.offset |= 1;
4884 else
4885 local_got_offsets[r_symndx] |= 1;
4886 }
4887
4888 if (off >= (bfd_vma) -2
4889 && ! GOT_TLS_GDESC_P (tls_type))
4890 abort ();
4891 if (r_type == R_386_TLS_GOTDESC
4892 || r_type == R_386_TLS_DESC_CALL)
4893 {
4894 relocation = htab->sgotplt_jump_table_size + offplt;
4895 unresolved_reloc = FALSE;
4896 }
4897 else if (r_type == ELF32_R_TYPE (rel->r_info))
4898 {
4899 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4900 + htab->elf.sgotplt->output_offset;
4901 relocation = htab->elf.sgot->output_section->vma
4902 + htab->elf.sgot->output_offset + off - g_o_t;
4903 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4904 && tls_type == GOT_TLS_IE_BOTH)
4905 relocation += 4;
4906 if (r_type == R_386_TLS_IE)
4907 relocation += g_o_t;
4908 unresolved_reloc = FALSE;
4909 }
4910 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4911 {
4912 unsigned int val, type;
4913 bfd_vma roff;
4914
4915 /* GD->IE transition. */
4916 type = *(contents + rel->r_offset - 2);
4917 val = *(contents + rel->r_offset - 1);
4918 if (type == 0x04)
4919 {
4920 /* Change
4921 leal foo@tlsgd(,%ebx,1), %eax
4922 call ___tls_get_addr@PLT
4923 into:
4924 movl %gs:0, %eax
4925 subl $foo@gottpoff(%ebx), %eax. */
4926 val >>= 3;
4927 roff = rel->r_offset - 3;
4928 }
4929 else
4930 {
4931 /* Change
4932 leal foo@tlsgd(%ebx), %eax
4933 call ___tls_get_addr@PLT
4934 nop
4935 or
4936 leal foo@tlsgd(%reg), %eax
4937 call *___tls_get_addr@GOT(%reg)
4938 which may be converted to
4939 addr32 call ___tls_get_addr
4940 into:
4941 movl %gs:0, %eax;
4942 subl $foo@gottpoff(%reg), %eax. */
4943 roff = rel->r_offset - 2;
4944 }
4945 memcpy (contents + roff,
4946 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4947 contents[roff + 7] = 0x80 | (val & 7);
4948 /* If foo is used only with foo@gotntpoff(%reg) and
4949 foo@indntpoff, but not with foo@gottpoff(%reg), change
4950 subl $foo@gottpoff(%reg), %eax
4951 into:
4952 addl $foo@gotntpoff(%reg), %eax. */
4953 if (tls_type == GOT_TLS_IE_POS)
4954 contents[roff + 6] = 0x03;
4955 bfd_put_32 (output_bfd,
4956 htab->elf.sgot->output_section->vma
4957 + htab->elf.sgot->output_offset + off
4958 - htab->elf.sgotplt->output_section->vma
4959 - htab->elf.sgotplt->output_offset,
4960 contents + roff + 8);
4961 /* Skip R_386_PLT32 and R_386_GOT32X. */
4962 rel++;
4963 wrel++;
4964 continue;
4965 }
4966 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4967 {
4968 /* GDesc -> IE transition.
4969 It's originally something like:
4970 leal x@tlsdesc(%ebx), %eax
4971
4972 Change it to:
4973 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4974 or:
4975 movl x@gottpoff(%ebx), %eax # before negl %eax
4976
4977 Registers other than %eax may be set up here. */
4978
4979 bfd_vma roff;
4980
4981 /* First, make sure it's a leal adding ebx to a 32-bit
4982 offset into any register, although it's probably
4983 almost always going to be eax. */
4984 roff = rel->r_offset;
4985
4986 /* Now modify the instruction as appropriate. */
4987 /* To turn a leal into a movl in the form we use it, it
4988 suffices to change the first byte from 0x8d to 0x8b.
4989 aoliva FIXME: should we decide to keep the leal, all
4990 we have to do is remove the statement below, and
4991 adjust the relaxation of R_386_TLS_DESC_CALL. */
4992 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4993
4994 if (tls_type == GOT_TLS_IE_BOTH)
4995 off += 4;
4996
4997 bfd_put_32 (output_bfd,
4998 htab->elf.sgot->output_section->vma
4999 + htab->elf.sgot->output_offset + off
5000 - htab->elf.sgotplt->output_section->vma
5001 - htab->elf.sgotplt->output_offset,
5002 contents + roff);
5003 continue;
5004 }
5005 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
5006 {
5007 /* GDesc -> IE transition.
5008 It's originally:
5009 call *(%eax)
5010
5011 Change it to:
5012 xchg %ax,%ax
5013 or
5014 negl %eax
5015 depending on how we transformed the TLS_GOTDESC above.
5016 */
5017
5018 bfd_vma roff;
5019
5020 roff = rel->r_offset;
5021
5022 /* Now modify the instruction as appropriate. */
5023 if (tls_type != GOT_TLS_IE_NEG)
5024 {
5025 /* xchg %ax,%ax */
5026 bfd_put_8 (output_bfd, 0x66, contents + roff);
5027 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5028 }
5029 else
5030 {
5031 /* negl %eax */
5032 bfd_put_8 (output_bfd, 0xf7, contents + roff);
5033 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
5034 }
5035
5036 continue;
5037 }
5038 else
5039 BFD_ASSERT (FALSE);
5040 break;
5041
5042 case R_386_TLS_LDM:
5043 if (! elf_i386_tls_transition (info, input_bfd,
5044 input_section, contents,
5045 symtab_hdr, sym_hashes,
5046 &r_type, GOT_UNKNOWN, rel,
5047 relend, h, r_symndx, TRUE))
5048 return FALSE;
5049
5050 if (r_type != R_386_TLS_LDM)
5051 {
5052 /* LD->LE transition. Change
5053 leal foo@tlsldm(%ebx) %eax
5054 call ___tls_get_addr@PLT
5055 into:
5056 movl %gs:0, %eax
5057 nop
5058 leal 0(%esi,1), %esi
5059 or change
5060 leal foo@tlsldm(%reg) %eax
5061 call *___tls_get_addr@GOT(%reg)
5062 which may be converted to
5063 addr32 call ___tls_get_addr
5064 into:
5065 movl %gs:0, %eax
5066 leal 0(%esi), %esi */
5067 BFD_ASSERT (r_type == R_386_TLS_LE_32);
5068 if (*(contents + rel->r_offset + 4) == 0xff
5069 || *(contents + rel->r_offset + 4) == 0x67)
5070 memcpy (contents + rel->r_offset - 2,
5071 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
5072 else
5073 memcpy (contents + rel->r_offset - 2,
5074 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
5075 /* Skip R_386_PC32/R_386_PLT32. */
5076 rel++;
5077 wrel++;
5078 continue;
5079 }
5080
5081 if (htab->elf.sgot == NULL)
5082 abort ();
5083
5084 off = htab->tls_ldm_got.offset;
5085 if (off & 1)
5086 off &= ~1;
5087 else
5088 {
5089 Elf_Internal_Rela outrel;
5090
5091 if (htab->elf.srelgot == NULL)
5092 abort ();
5093
5094 outrel.r_offset = (htab->elf.sgot->output_section->vma
5095 + htab->elf.sgot->output_offset + off);
5096
5097 bfd_put_32 (output_bfd, 0,
5098 htab->elf.sgot->contents + off);
5099 bfd_put_32 (output_bfd, 0,
5100 htab->elf.sgot->contents + off + 4);
5101 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
5102 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5103 htab->tls_ldm_got.offset |= 1;
5104 }
5105 relocation = htab->elf.sgot->output_section->vma
5106 + htab->elf.sgot->output_offset + off
5107 - htab->elf.sgotplt->output_section->vma
5108 - htab->elf.sgotplt->output_offset;
5109 unresolved_reloc = FALSE;
5110 break;
5111
5112 case R_386_TLS_LDO_32:
5113 if (!bfd_link_executable (info)
5114 || (input_section->flags & SEC_CODE) == 0)
5115 relocation -= elf_i386_dtpoff_base (info);
5116 else
5117 /* When converting LDO to LE, we must negate. */
5118 relocation = -elf_i386_tpoff (info, relocation);
5119 break;
5120
5121 case R_386_TLS_LE_32:
5122 case R_386_TLS_LE:
5123 if (!bfd_link_executable (info))
5124 {
5125 Elf_Internal_Rela outrel;
5126 asection *sreloc;
5127
5128 outrel.r_offset = rel->r_offset
5129 + input_section->output_section->vma
5130 + input_section->output_offset;
5131 if (h != NULL && h->dynindx != -1)
5132 indx = h->dynindx;
5133 else
5134 indx = 0;
5135 if (r_type == R_386_TLS_LE_32)
5136 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5137 else
5138 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5139 sreloc = elf_section_data (input_section)->sreloc;
5140 if (sreloc == NULL)
5141 abort ();
5142 elf_append_rel (output_bfd, sreloc, &outrel);
5143 if (indx)
5144 continue;
5145 else if (r_type == R_386_TLS_LE_32)
5146 relocation = elf_i386_dtpoff_base (info) - relocation;
5147 else
5148 relocation -= elf_i386_dtpoff_base (info);
5149 }
5150 else if (r_type == R_386_TLS_LE_32)
5151 relocation = elf_i386_tpoff (info, relocation);
5152 else
5153 relocation = -elf_i386_tpoff (info, relocation);
5154 break;
5155
5156 default:
5157 break;
5158 }
5159
5160 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5161 because such sections are not SEC_ALLOC and thus ld.so will
5162 not process them. */
5163 if (unresolved_reloc
5164 && !((input_section->flags & SEC_DEBUGGING) != 0
5165 && h->def_dynamic)
5166 && _bfd_elf_section_offset (output_bfd, info, input_section,
5167 rel->r_offset) != (bfd_vma) -1)
5168 {
5169 _bfd_error_handler
5170 /* xgettext:c-format */
5171 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5172 input_bfd,
5173 input_section,
5174 (long) rel->r_offset,
5175 howto->name,
5176 h->root.root.string);
5177 return FALSE;
5178 }
5179
5180 do_relocation:
5181 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5182 contents, rel->r_offset,
5183 relocation, 0);
5184
5185 check_relocation_error:
5186 if (r != bfd_reloc_ok)
5187 {
5188 const char *name;
5189
5190 if (h != NULL)
5191 name = h->root.root.string;
5192 else
5193 {
5194 name = bfd_elf_string_from_elf_section (input_bfd,
5195 symtab_hdr->sh_link,
5196 sym->st_name);
5197 if (name == NULL)
5198 return FALSE;
5199 if (*name == '\0')
5200 name = bfd_section_name (input_bfd, sec);
5201 }
5202
5203 if (r == bfd_reloc_overflow)
5204 (*info->callbacks->reloc_overflow)
5205 (info, (h ? &h->root : NULL), name, howto->name,
5206 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5207 else
5208 {
5209 _bfd_error_handler
5210 /* xgettext:c-format */
5211 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5212 input_bfd, input_section,
5213 (long) rel->r_offset, name, (int) r);
5214 return FALSE;
5215 }
5216 }
5217
5218 if (wrel != rel)
5219 *wrel = *rel;
5220 }
5221
5222 if (wrel != rel)
5223 {
5224 Elf_Internal_Shdr *rel_hdr;
5225 size_t deleted = rel - wrel;
5226
5227 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5228 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5229 if (rel_hdr->sh_size == 0)
5230 {
5231 /* It is too late to remove an empty reloc section. Leave
5232 one NONE reloc.
5233 ??? What is wrong with an empty section??? */
5234 rel_hdr->sh_size = rel_hdr->sh_entsize;
5235 deleted -= 1;
5236 }
5237 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5238 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5239 input_section->reloc_count -= deleted;
5240 }
5241
5242 return TRUE;
5243 }
5244
5245 /* Finish up dynamic symbol handling. We set the contents of various
5246 dynamic sections here. */
5247
5248 static bfd_boolean
5249 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5250 struct bfd_link_info *info,
5251 struct elf_link_hash_entry *h,
5252 Elf_Internal_Sym *sym)
5253 {
5254 struct elf_i386_link_hash_table *htab;
5255 unsigned plt_entry_size;
5256 const struct elf_i386_backend_data *abed;
5257 struct elf_i386_link_hash_entry *eh;
5258 bfd_boolean local_undefweak;
5259
5260 htab = elf_i386_hash_table (info);
5261 if (htab == NULL)
5262 return FALSE;
5263
5264 abed = get_elf_i386_backend_data (output_bfd);
5265 plt_entry_size = htab->plt.plt_entry_size;
5266
5267 eh = (struct elf_i386_link_hash_entry *) h;
5268 if (eh->no_finish_dynamic_symbol)
5269 abort ();
5270
5271 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5272 resolved undefined weak symbols in executable so that their
5273 references have value 0 at run-time. */
5274 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5275 eh->has_got_reloc,
5276 eh);
5277
5278 if (h->plt.offset != (bfd_vma) -1)
5279 {
5280 bfd_vma plt_index;
5281 bfd_vma got_offset;
5282 Elf_Internal_Rela rel;
5283 bfd_byte *loc;
5284 asection *plt, *gotplt, *relplt;
5285
5286 /* When building a static executable, use .iplt, .igot.plt and
5287 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5288 if (htab->elf.splt != NULL)
5289 {
5290 plt = htab->elf.splt;
5291 gotplt = htab->elf.sgotplt;
5292 relplt = htab->elf.srelplt;
5293 }
5294 else
5295 {
5296 plt = htab->elf.iplt;
5297 gotplt = htab->elf.igotplt;
5298 relplt = htab->elf.irelplt;
5299 }
5300
5301 /* This symbol has an entry in the procedure linkage table. Set
5302 it up. */
5303
5304 if ((h->dynindx == -1
5305 && !local_undefweak
5306 && !((h->forced_local || bfd_link_executable (info))
5307 && h->def_regular
5308 && h->type == STT_GNU_IFUNC))
5309 || plt == NULL
5310 || gotplt == NULL
5311 || relplt == NULL)
5312 abort ();
5313
5314 /* Get the index in the procedure linkage table which
5315 corresponds to this symbol. This is the index of this symbol
5316 in all the symbols for which we are making plt entries. The
5317 first entry in the procedure linkage table is reserved.
5318
5319 Get the offset into the .got table of the entry that
5320 corresponds to this function. Each .got entry is 4 bytes.
5321 The first three are reserved.
5322
5323 For static executables, we don't reserve anything. */
5324
5325 if (plt == htab->elf.splt)
5326 {
5327 got_offset = (h->plt.offset / plt_entry_size
5328 - htab->plt.has_plt0);
5329 got_offset = (got_offset + 3) * 4;
5330 }
5331 else
5332 {
5333 got_offset = h->plt.offset / plt_entry_size;
5334 got_offset = got_offset * 4;
5335 }
5336
5337 /* Fill in the entry in the procedure linkage table and update
5338 the first slot. */
5339 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
5340 plt_entry_size);
5341 if (! bfd_link_pic (info))
5342 {
5343 bfd_put_32 (output_bfd,
5344 (gotplt->output_section->vma
5345 + gotplt->output_offset
5346 + got_offset),
5347 plt->contents + h->plt.offset
5348 + htab->plt.plt_got_offset);
5349
5350 if (abed->os == is_vxworks)
5351 {
5352 int s, k, reloc_index;
5353
5354 /* Create the R_386_32 relocation referencing the GOT
5355 for this PLT entry. */
5356
5357 /* S: Current slot number (zero-based). */
5358 s = ((h->plt.offset - htab->plt.plt_entry_size)
5359 / htab->plt.plt_entry_size);
5360 /* K: Number of relocations for PLTResolve. */
5361 if (bfd_link_pic (info))
5362 k = PLTRESOLVE_RELOCS_SHLIB;
5363 else
5364 k = PLTRESOLVE_RELOCS;
5365 /* Skip the PLTresolve relocations, and the relocations for
5366 the other PLT slots. */
5367 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5368 loc = (htab->srelplt2->contents + reloc_index
5369 * sizeof (Elf32_External_Rel));
5370
5371 rel.r_offset = (htab->elf.splt->output_section->vma
5372 + htab->elf.splt->output_offset
5373 + h->plt.offset + 2),
5374 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5375 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5376
5377 /* Create the R_386_32 relocation referencing the beginning of
5378 the PLT for this GOT entry. */
5379 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5380 + htab->elf.sgotplt->output_offset
5381 + got_offset);
5382 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5383 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5384 loc + sizeof (Elf32_External_Rel));
5385 }
5386 }
5387 else
5388 {
5389 bfd_put_32 (output_bfd, got_offset,
5390 plt->contents + h->plt.offset
5391 + htab->plt.plt_got_offset);
5392 }
5393
5394 /* Fill in the entry in the global offset table. Leave the entry
5395 as zero for undefined weak symbol in PIE. No PLT relocation
5396 against undefined weak symbol in PIE. */
5397 if (!local_undefweak)
5398 {
5399 if (htab->plt.has_plt0)
5400 bfd_put_32 (output_bfd,
5401 (plt->output_section->vma
5402 + plt->output_offset
5403 + h->plt.offset
5404 + htab->lazy_plt->plt_lazy_offset),
5405 gotplt->contents + got_offset);
5406
5407 /* Fill in the entry in the .rel.plt section. */
5408 rel.r_offset = (gotplt->output_section->vma
5409 + gotplt->output_offset
5410 + got_offset);
5411 if (h->dynindx == -1
5412 || ((bfd_link_executable (info)
5413 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5414 && h->def_regular
5415 && h->type == STT_GNU_IFUNC))
5416 {
5417 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5418 h->root.root.string,
5419 h->root.u.def.section->owner);
5420
5421 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5422 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5423 in the .got.plt section. */
5424 bfd_put_32 (output_bfd,
5425 (h->root.u.def.value
5426 + h->root.u.def.section->output_section->vma
5427 + h->root.u.def.section->output_offset),
5428 gotplt->contents + got_offset);
5429 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5430 /* R_386_IRELATIVE comes last. */
5431 plt_index = htab->next_irelative_index--;
5432 }
5433 else
5434 {
5435 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5436 plt_index = htab->next_jump_slot_index++;
5437 }
5438
5439 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5440 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5441
5442 /* Don't fill the second and third slots in PLT entry for
5443 static executables nor without PLT0. */
5444 if (plt == htab->elf.splt && htab->plt.has_plt0)
5445 {
5446 bfd_put_32 (output_bfd,
5447 plt_index * sizeof (Elf32_External_Rel),
5448 plt->contents + h->plt.offset
5449 + htab->lazy_plt->plt_reloc_offset);
5450 bfd_put_32 (output_bfd,
5451 - (h->plt.offset
5452 + htab->lazy_plt->plt_plt_offset + 4),
5453 (plt->contents + h->plt.offset
5454 + htab->lazy_plt->plt_plt_offset));
5455 }
5456 }
5457 }
5458 else if (eh->plt_got.offset != (bfd_vma) -1)
5459 {
5460 bfd_vma got_offset, plt_offset;
5461 asection *plt, *got, *gotplt;
5462 const bfd_byte *got_plt_entry;
5463
5464 /* Set the entry in the GOT procedure linkage table. */
5465 plt = htab->plt_got;
5466 got = htab->elf.sgot;
5467 gotplt = htab->elf.sgotplt;
5468 got_offset = h->got.offset;
5469
5470 if (got_offset == (bfd_vma) -1
5471 || plt == NULL
5472 || got == NULL
5473 || gotplt == NULL)
5474 abort ();
5475
5476 /* Fill in the entry in the GOT procedure linkage table. */
5477 if (! bfd_link_pic (info))
5478 {
5479 got_plt_entry = htab->non_lazy_plt->plt_entry;
5480 got_offset += got->output_section->vma + got->output_offset;
5481 }
5482 else
5483 {
5484 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
5485 got_offset += (got->output_section->vma
5486 + got->output_offset
5487 - gotplt->output_section->vma
5488 - gotplt->output_offset);
5489 }
5490
5491 plt_offset = eh->plt_got.offset;
5492 memcpy (plt->contents + plt_offset, got_plt_entry,
5493 htab->non_lazy_plt->plt_entry_size);
5494 bfd_put_32 (output_bfd, got_offset,
5495 (plt->contents + plt_offset
5496 + htab->non_lazy_plt->plt_got_offset));
5497 }
5498
5499 if (!local_undefweak
5500 && !h->def_regular
5501 && (h->plt.offset != (bfd_vma) -1
5502 || eh->plt_got.offset != (bfd_vma) -1))
5503 {
5504 /* Mark the symbol as undefined, rather than as defined in
5505 the .plt section. Leave the value if there were any
5506 relocations where pointer equality matters (this is a clue
5507 for the dynamic linker, to make function pointer
5508 comparisons work between an application and shared
5509 library), otherwise set it to zero. If a function is only
5510 called from a binary, there is no need to slow down
5511 shared libraries because of that. */
5512 sym->st_shndx = SHN_UNDEF;
5513 if (!h->pointer_equality_needed)
5514 sym->st_value = 0;
5515 }
5516
5517 /* Don't generate dynamic GOT relocation against undefined weak
5518 symbol in executable. */
5519 if (h->got.offset != (bfd_vma) -1
5520 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5521 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5522 && !local_undefweak)
5523 {
5524 Elf_Internal_Rela rel;
5525 asection *relgot = htab->elf.srelgot;
5526
5527 /* This symbol has an entry in the global offset table. Set it
5528 up. */
5529
5530 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5531 abort ();
5532
5533 rel.r_offset = (htab->elf.sgot->output_section->vma
5534 + htab->elf.sgot->output_offset
5535 + (h->got.offset & ~(bfd_vma) 1));
5536
5537 /* If this is a static link, or it is a -Bsymbolic link and the
5538 symbol is defined locally or was forced to be local because
5539 of a version file, we just want to emit a RELATIVE reloc.
5540 The entry in the global offset table will already have been
5541 initialized in the relocate_section function. */
5542 if (h->def_regular
5543 && h->type == STT_GNU_IFUNC)
5544 {
5545 if (h->plt.offset == (bfd_vma) -1)
5546 {
5547 /* STT_GNU_IFUNC is referenced without PLT. */
5548 if (htab->elf.splt == NULL)
5549 {
5550 /* use .rel[a].iplt section to store .got relocations
5551 in static executable. */
5552 relgot = htab->elf.irelplt;
5553 }
5554 if (SYMBOL_REFERENCES_LOCAL (info, h))
5555 {
5556 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5557 h->root.root.string,
5558 h->root.u.def.section->owner);
5559
5560 bfd_put_32 (output_bfd,
5561 (h->root.u.def.value
5562 + h->root.u.def.section->output_section->vma
5563 + h->root.u.def.section->output_offset),
5564 htab->elf.sgot->contents + h->got.offset);
5565 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5566 }
5567 else
5568 goto do_glob_dat;
5569 }
5570 else if (bfd_link_pic (info))
5571 {
5572 /* Generate R_386_GLOB_DAT. */
5573 goto do_glob_dat;
5574 }
5575 else
5576 {
5577 asection *plt;
5578
5579 if (!h->pointer_equality_needed)
5580 abort ();
5581
5582 /* For non-shared object, we can't use .got.plt, which
5583 contains the real function addres if we need pointer
5584 equality. We load the GOT entry with the PLT entry. */
5585 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5586 bfd_put_32 (output_bfd,
5587 (plt->output_section->vma
5588 + plt->output_offset + h->plt.offset),
5589 htab->elf.sgot->contents + h->got.offset);
5590 return TRUE;
5591 }
5592 }
5593 else if (bfd_link_pic (info)
5594 && SYMBOL_REFERENCES_LOCAL (info, h))
5595 {
5596 BFD_ASSERT((h->got.offset & 1) != 0);
5597 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5598 }
5599 else
5600 {
5601 BFD_ASSERT((h->got.offset & 1) == 0);
5602 do_glob_dat:
5603 bfd_put_32 (output_bfd, (bfd_vma) 0,
5604 htab->elf.sgot->contents + h->got.offset);
5605 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5606 }
5607
5608 elf_append_rel (output_bfd, relgot, &rel);
5609 }
5610
5611 if (h->needs_copy)
5612 {
5613 Elf_Internal_Rela rel;
5614 asection *s;
5615
5616 /* This symbol needs a copy reloc. Set it up. */
5617
5618 if (h->dynindx == -1
5619 || (h->root.type != bfd_link_hash_defined
5620 && h->root.type != bfd_link_hash_defweak)
5621 || htab->elf.srelbss == NULL
5622 || htab->elf.sreldynrelro == NULL)
5623 abort ();
5624
5625 rel.r_offset = (h->root.u.def.value
5626 + h->root.u.def.section->output_section->vma
5627 + h->root.u.def.section->output_offset);
5628 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5629 if (h->root.u.def.section == htab->elf.sdynrelro)
5630 s = htab->elf.sreldynrelro;
5631 else
5632 s = htab->elf.srelbss;
5633 elf_append_rel (output_bfd, s, &rel);
5634 }
5635
5636 return TRUE;
5637 }
5638
5639 /* Finish up local dynamic symbol handling. We set the contents of
5640 various dynamic sections here. */
5641
5642 static bfd_boolean
5643 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5644 {
5645 struct elf_link_hash_entry *h
5646 = (struct elf_link_hash_entry *) *slot;
5647 struct bfd_link_info *info
5648 = (struct bfd_link_info *) inf;
5649
5650 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5651 h, NULL);
5652 }
5653
5654 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5655 here since undefined weak symbol may not be dynamic and may not be
5656 called for elf_i386_finish_dynamic_symbol. */
5657
5658 static bfd_boolean
5659 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5660 void *inf)
5661 {
5662 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5663 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5664
5665 if (h->root.type != bfd_link_hash_undefweak
5666 || h->dynindx != -1)
5667 return TRUE;
5668
5669 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5670 info, h, NULL);
5671 }
5672
5673 /* Used to decide how to sort relocs in an optimal manner for the
5674 dynamic linker, before writing them out. */
5675
5676 static enum elf_reloc_type_class
5677 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5678 const asection *rel_sec ATTRIBUTE_UNUSED,
5679 const Elf_Internal_Rela *rela)
5680 {
5681 bfd *abfd = info->output_bfd;
5682 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5683 struct elf_link_hash_table *htab = elf_hash_table (info);
5684
5685 if (htab->dynsym != NULL
5686 && htab->dynsym->contents != NULL)
5687 {
5688 /* Check relocation against STT_GNU_IFUNC symbol if there are
5689 dynamic symbols. */
5690 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5691 if (r_symndx != STN_UNDEF)
5692 {
5693 Elf_Internal_Sym sym;
5694 if (!bed->s->swap_symbol_in (abfd,
5695 (htab->dynsym->contents
5696 + r_symndx * sizeof (Elf32_External_Sym)),
5697 0, &sym))
5698 abort ();
5699
5700 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5701 return reloc_class_ifunc;
5702 }
5703 }
5704
5705 switch (ELF32_R_TYPE (rela->r_info))
5706 {
5707 case R_386_IRELATIVE:
5708 return reloc_class_ifunc;
5709 case R_386_RELATIVE:
5710 return reloc_class_relative;
5711 case R_386_JUMP_SLOT:
5712 return reloc_class_plt;
5713 case R_386_COPY:
5714 return reloc_class_copy;
5715 default:
5716 return reloc_class_normal;
5717 }
5718 }
5719
5720 /* Finish up the dynamic sections. */
5721
5722 static bfd_boolean
5723 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5724 struct bfd_link_info *info)
5725 {
5726 struct elf_i386_link_hash_table *htab;
5727 bfd *dynobj;
5728 asection *sdyn;
5729 const struct elf_i386_backend_data *abed;
5730
5731 htab = elf_i386_hash_table (info);
5732 if (htab == NULL)
5733 return FALSE;
5734
5735 dynobj = htab->elf.dynobj;
5736 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5737 abed = get_elf_i386_backend_data (output_bfd);
5738
5739 if (htab->elf.dynamic_sections_created)
5740 {
5741 Elf32_External_Dyn *dyncon, *dynconend;
5742
5743 if (sdyn == NULL || htab->elf.sgot == NULL)
5744 abort ();
5745
5746 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5747 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5748 for (; dyncon < dynconend; dyncon++)
5749 {
5750 Elf_Internal_Dyn dyn;
5751 asection *s;
5752
5753 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5754
5755 switch (dyn.d_tag)
5756 {
5757 default:
5758 if (abed->os == is_vxworks
5759 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5760 break;
5761 continue;
5762
5763 case DT_PLTGOT:
5764 s = htab->elf.sgotplt;
5765 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5766 break;
5767
5768 case DT_JMPREL:
5769 s = htab->elf.srelplt;
5770 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5771 break;
5772
5773 case DT_PLTRELSZ:
5774 s = htab->elf.srelplt;
5775 dyn.d_un.d_val = s->size;
5776 break;
5777 }
5778
5779 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5780 }
5781
5782 if (htab->elf.splt && htab->elf.splt->size > 0)
5783 {
5784 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5785 really seem like the right value. */
5786 elf_section_data (htab->elf.splt->output_section)
5787 ->this_hdr.sh_entsize = 4;
5788
5789 if (htab->plt.has_plt0)
5790 {
5791 /* Fill in the special first entry in the procedure linkage
5792 table. */
5793 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
5794 htab->lazy_plt->plt0_entry_size);
5795 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
5796 abed->plt0_pad_byte,
5797 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
5798 if (!bfd_link_pic (info))
5799 {
5800 bfd_put_32 (output_bfd,
5801 (htab->elf.sgotplt->output_section->vma
5802 + htab->elf.sgotplt->output_offset
5803 + 4),
5804 htab->elf.splt->contents
5805 + htab->lazy_plt->plt0_got1_offset);
5806 bfd_put_32 (output_bfd,
5807 (htab->elf.sgotplt->output_section->vma
5808 + htab->elf.sgotplt->output_offset
5809 + 8),
5810 htab->elf.splt->contents
5811 + htab->lazy_plt->plt0_got2_offset);
5812
5813 if (abed->os == is_vxworks)
5814 {
5815 Elf_Internal_Rela rel;
5816 int num_plts = (htab->elf.splt->size
5817 / htab->plt.plt_entry_size) - 1;
5818 unsigned char *p;
5819
5820 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
5821 + 4. On IA32 we use REL relocations so the
5822 addend goes in the PLT directly. */
5823 rel.r_offset = (htab->elf.splt->output_section->vma
5824 + htab->elf.splt->output_offset
5825 + htab->lazy_plt->plt0_got1_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 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
5831 + 8. */
5832 rel.r_offset = (htab->elf.splt->output_section->vma
5833 + htab->elf.splt->output_offset
5834 + htab->lazy_plt->plt0_got2_offset);
5835 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
5836 R_386_32);
5837 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5838 htab->srelplt2->contents +
5839 sizeof (Elf32_External_Rel));
5840 /* Correct the .rel.plt.unloaded relocations. */
5841 p = htab->srelplt2->contents;
5842 if (bfd_link_pic (info))
5843 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5844 else
5845 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5846
5847 for (; num_plts; num_plts--)
5848 {
5849 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5850 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
5851 R_386_32);
5852 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5853 p += sizeof (Elf32_External_Rel);
5854
5855 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5856 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
5857 R_386_32);
5858 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5859 p += sizeof (Elf32_External_Rel);
5860 }
5861 }
5862 }
5863 }
5864 }
5865
5866 if (htab->plt_got != NULL && htab->plt_got->size > 0)
5867 elf_section_data (htab->plt_got->output_section)
5868 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
5869 }
5870
5871 /* Fill in the first three entries in the global offset table. */
5872 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
5873 {
5874 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5875 {
5876 _bfd_error_handler
5877 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5878 return FALSE;
5879 }
5880
5881 bfd_put_32 (output_bfd,
5882 (sdyn == NULL ? 0
5883 : sdyn->output_section->vma + sdyn->output_offset),
5884 htab->elf.sgotplt->contents);
5885 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5886 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5887
5888 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5889 }
5890
5891 /* Adjust .eh_frame for .plt section. */
5892 if (htab->plt_eh_frame != NULL
5893 && htab->plt_eh_frame->contents != NULL)
5894 {
5895 if (htab->elf.splt != NULL
5896 && htab->elf.splt->size != 0
5897 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5898 && htab->elf.splt->output_section != NULL
5899 && htab->plt_eh_frame->output_section != NULL)
5900 {
5901 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5902 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5903 + htab->plt_eh_frame->output_offset
5904 + PLT_FDE_START_OFFSET;
5905 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5906 htab->plt_eh_frame->contents
5907 + PLT_FDE_START_OFFSET);
5908 }
5909 if (htab->plt_eh_frame->sec_info_type
5910 == SEC_INFO_TYPE_EH_FRAME)
5911 {
5912 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5913 htab->plt_eh_frame,
5914 htab->plt_eh_frame->contents))
5915 return FALSE;
5916 }
5917 }
5918
5919 /* Adjust .eh_frame for .plt.got section. */
5920 if (htab->plt_got_eh_frame != NULL
5921 && htab->plt_got_eh_frame->contents != NULL)
5922 {
5923 if (htab->plt_got != NULL
5924 && htab->plt_got->size != 0
5925 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
5926 && htab->plt_got->output_section != NULL
5927 && htab->plt_got_eh_frame->output_section != NULL)
5928 {
5929 bfd_vma plt_start = htab->plt_got->output_section->vma;
5930 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
5931 + htab->plt_got_eh_frame->output_offset
5932 + PLT_FDE_START_OFFSET;
5933 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5934 htab->plt_got_eh_frame->contents
5935 + PLT_FDE_START_OFFSET);
5936 }
5937 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
5938 {
5939 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5940 htab->plt_got_eh_frame,
5941 htab->plt_got_eh_frame->contents))
5942 return FALSE;
5943 }
5944 }
5945
5946 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5947 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5948
5949 /* Fill PLT entries for undefined weak symbols in PIE. */
5950 if (bfd_link_pie (info))
5951 bfd_hash_traverse (&info->hash->table,
5952 elf_i386_pie_finish_undefweak_symbol,
5953 info);
5954
5955 return TRUE;
5956 }
5957
5958 /* Fill PLT/GOT entries and allocate dynamic relocations for local
5959 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
5960 It has to be done before elf_link_sort_relocs is called so that
5961 dynamic relocations are properly sorted. */
5962
5963 static bfd_boolean
5964 elf_i386_output_arch_local_syms
5965 (bfd *output_bfd ATTRIBUTE_UNUSED,
5966 struct bfd_link_info *info,
5967 void *flaginfo ATTRIBUTE_UNUSED,
5968 int (*func) (void *, const char *,
5969 Elf_Internal_Sym *,
5970 asection *,
5971 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
5972 {
5973 struct elf_i386_link_hash_table *htab = elf_i386_hash_table (info);
5974 if (htab == NULL)
5975 return FALSE;
5976
5977 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5978 htab_traverse (htab->loc_hash_table,
5979 elf_i386_finish_local_dynamic_symbol,
5980 info);
5981
5982 return TRUE;
5983 }
5984
5985 /* Sort relocs into address order. */
5986
5987 static int
5988 compare_relocs (const void *ap, const void *bp)
5989 {
5990 const arelent *a = * (const arelent **) ap;
5991 const arelent *b = * (const arelent **) bp;
5992
5993 if (a->address > b->address)
5994 return 1;
5995 else if (a->address < b->address)
5996 return -1;
5997 else
5998 return 0;
5999 }
6000
6001 enum elf_i386_plt_type
6002 {
6003 plt_non_lazy = 0,
6004 plt_lazy = 1 << 0,
6005 plt_pic = 1 << 1,
6006 plt_unknown = -1
6007 };
6008
6009 struct elf_i386_plt
6010 {
6011 const char *name;
6012 asection *sec;
6013 bfd_byte *contents;
6014 enum elf_i386_plt_type type;
6015 unsigned int plt_got_offset;
6016 unsigned int plt_entry_size;
6017 long count;
6018 };
6019
6020 /* Forward declaration. */
6021 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt;
6022
6023 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
6024 dynamic relocations. */
6025
6026 static long
6027 elf_i386_get_synthetic_symtab (bfd *abfd,
6028 long symcount ATTRIBUTE_UNUSED,
6029 asymbol **syms ATTRIBUTE_UNUSED,
6030 long dynsymcount,
6031 asymbol **dynsyms,
6032 asymbol **ret)
6033 {
6034 long size, count, i, n;
6035 int j;
6036 unsigned int plt_got_offset, plt_entry_size;
6037 asymbol *s;
6038 bfd_byte *plt_contents;
6039 long dynrelcount, relsize;
6040 arelent **dynrelbuf;
6041 const struct elf_i386_lazy_plt_layout *lazy_plt;
6042 const struct elf_i386_non_lazy_plt_layout *non_lazy_plt;
6043 asection *plt;
6044 bfd_vma got_addr;
6045 char *names;
6046 enum elf_i386_plt_type plt_type;
6047 struct elf_i386_plt plts[] =
6048 {
6049 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0 },
6050 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0 },
6051 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0 }
6052 };
6053
6054 *ret = NULL;
6055
6056 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
6057 return 0;
6058
6059 if (dynsymcount <= 0)
6060 return 0;
6061
6062 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
6063 if (relsize <= 0)
6064 return -1;
6065
6066 dynrelbuf = (arelent **) bfd_malloc (relsize);
6067 if (dynrelbuf == NULL)
6068 return -1;
6069
6070 dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
6071 dynsyms);
6072
6073 /* Sort the relocs by address. */
6074 qsort (dynrelbuf, dynrelcount, sizeof (arelent *), compare_relocs);
6075
6076 non_lazy_plt = NULL;
6077 /* Silence GCC 6. */
6078 lazy_plt = NULL;
6079 switch (get_elf_i386_backend_data (abfd)->os)
6080 {
6081 case is_normal:
6082 non_lazy_plt = &elf_i386_non_lazy_plt;
6083 /* Fall through */
6084 case is_vxworks:
6085 lazy_plt = &elf_i386_lazy_plt;
6086 break;
6087 case is_nacl:
6088 lazy_plt = &elf_i386_nacl_plt;
6089 break;
6090 }
6091
6092 got_addr = 0;
6093
6094 count = 0;
6095 for (j = 0; plts[j].name != NULL; j++)
6096 {
6097 plt = bfd_get_section_by_name (abfd, plts[j].name);
6098 if (plt == NULL)
6099 continue;
6100
6101 /* Get the PLT section contents. */
6102 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6103 if (plt_contents == NULL)
6104 break;
6105 if (!bfd_get_section_contents (abfd, (asection *) plt,
6106 plt_contents, 0, plt->size))
6107 {
6108 free (plt_contents);
6109 break;
6110 }
6111
6112 /* Check what kind of PLT it is. */
6113 plt_type = plt_unknown;
6114 if (plts[j].type == plt_unknown)
6115 {
6116 /* Match lazy PLT first. */
6117 if (memcmp (plt_contents, lazy_plt->plt0_entry,
6118 lazy_plt->plt0_got1_offset) == 0)
6119 plt_type = plt_lazy;
6120 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
6121 lazy_plt->plt0_got1_offset) == 0)
6122 plt_type = plt_lazy | plt_pic;
6123 }
6124
6125 if (non_lazy_plt != NULL
6126 && (plt_type == plt_unknown || plt_type == plt_non_lazy))
6127 {
6128 /* Match non-lazy PLT. */
6129 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
6130 non_lazy_plt->plt_got_offset) == 0)
6131 plt_type = plt_non_lazy;
6132 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
6133 non_lazy_plt->plt_got_offset) == 0)
6134 plt_type = plt_pic;
6135 }
6136
6137 if (plt_type == plt_unknown)
6138 continue;
6139
6140 plts[j].sec = plt;
6141 plts[j].type = plt_type;
6142
6143 if ((plt_type & plt_lazy))
6144 {
6145 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
6146 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
6147 /* Skip PLT0 in lazy PLT. */
6148 i = 1;
6149 }
6150 else
6151 {
6152 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
6153 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
6154 i = 0;
6155 }
6156
6157 n = plt->size / plts[j].plt_entry_size;
6158 plts[j].count = n;
6159 count += n - i;
6160
6161 plts[j].contents = plt_contents;
6162
6163 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
6164 if ((plt_type & plt_pic))
6165 got_addr = (bfd_vma) -1;
6166 }
6167
6168 size = count * sizeof (asymbol);
6169 s = *ret = (asymbol *) bfd_zmalloc (size);
6170 if (s == NULL)
6171 {
6172 bad_return:
6173 for (j = 0; plts[j].name != NULL; j++)
6174 if (plts[j].contents != NULL)
6175 free (plts[j].contents);
6176 free (dynrelbuf);
6177 return -1;
6178 }
6179
6180 if (got_addr)
6181 {
6182 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
6183 address. */
6184 asection *sec = bfd_get_section_by_name (abfd, ".got.plt");
6185 if (sec != NULL)
6186 got_addr = sec->vma;
6187 else
6188 {
6189 sec = bfd_get_section_by_name (abfd, ".got");
6190 if (sec != NULL)
6191 got_addr = sec->vma;
6192 }
6193
6194 if (got_addr == (bfd_vma) -1)
6195 goto bad_return;
6196 }
6197
6198 /* Check for each PLT section. */
6199 size = 0;
6200 n = 0;
6201 for (j = 0; plts[j].name != NULL; j++)
6202 if ((plt_contents = plts[j].contents) != NULL)
6203 {
6204 long k;
6205 bfd_vma offset;
6206
6207 plt_got_offset = plts[j].plt_got_offset;
6208 plt_entry_size = plts[j].plt_entry_size;
6209
6210 plt = plts[j].sec;
6211
6212 if ((plts[j].type & plt_lazy))
6213 {
6214 /* Skip PLT0 in lazy PLT. */
6215 k = 1;
6216 offset = plt_entry_size;
6217 }
6218 else
6219 {
6220 k = 0;
6221 offset = 0;
6222 }
6223
6224 /* Check each PLT entry against dynamic relocations. */
6225 for (; k < plts[j].count; k++)
6226 {
6227 int off;
6228 bfd_vma got_vma;
6229 long min, max, mid;
6230 arelent *p;
6231
6232 /* Get the GOT offset, a signed 32-bit integer. */
6233 off = H_GET_32 (abfd, (plt_contents + offset
6234 + plt_got_offset));
6235 got_vma = got_addr + off;
6236
6237 /* Binary search. */
6238 p = dynrelbuf[0];
6239 min = 0;
6240 max = dynrelcount;
6241 while ((min + 1) < max)
6242 {
6243 arelent *r;
6244
6245 mid = (min + max) / 2;
6246 r = dynrelbuf[mid];
6247 if (got_vma > r->address)
6248 min = mid;
6249 else if (got_vma < r->address)
6250 max = mid;
6251 else
6252 {
6253 p = r;
6254 break;
6255 }
6256 }
6257
6258 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
6259 if (got_vma == p->address
6260 && p->howto != NULL
6261 && (p->howto->type == R_386_JUMP_SLOT
6262 || p->howto->type == R_386_GLOB_DAT
6263 || p->howto->type == R_386_IRELATIVE))
6264 {
6265 *s = **p->sym_ptr_ptr;
6266 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
6267 set. Since we are defining a symbol, ensure one
6268 of them is set. */
6269 if ((s->flags & BSF_LOCAL) == 0)
6270 s->flags |= BSF_GLOBAL;
6271 s->flags |= BSF_SYNTHETIC;
6272 /* This is no longer a section symbol. */
6273 s->flags &= ~BSF_SECTION_SYM;
6274 s->section = plt;
6275 s->the_bfd = plt->owner;
6276 s->value = offset;
6277 /* Store relocation for later use. */
6278 s->udata.p = p;
6279 /* Add @plt to function name later. */
6280 size += strlen (s->name) + sizeof ("@plt");
6281 if (p->addend != 0)
6282 size += sizeof ("+0x") - 1 + 8;
6283 n++;
6284 s++;
6285 }
6286 offset += plt_entry_size;
6287 }
6288 }
6289
6290 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
6291 if (n == 0)
6292 goto bad_return;
6293
6294 count = n;
6295
6296 /* Allocate space for @plt suffixes. */
6297 names = (char *) bfd_malloc (size);
6298 if (s == NULL)
6299 goto bad_return;
6300
6301 s = *ret;
6302 for (i = 0; i < count; i++)
6303 {
6304 /* Add @plt to function name. */
6305 arelent *p = (arelent *) s->udata.p;
6306 /* Clear it now. */
6307 s->udata.p = NULL;
6308 size = strlen (s->name);
6309 memcpy (names, s->name, size);
6310 s->name = names;
6311 names += size;
6312 if (p->addend != 0)
6313 {
6314 char buf[30], *a;
6315
6316 memcpy (names, "+0x", sizeof ("+0x") - 1);
6317 names += sizeof ("+0x") - 1;
6318 bfd_sprintf_vma (abfd, buf, p->addend);
6319 for (a = buf; *a == '0'; ++a)
6320 ;
6321 size = strlen (a);
6322 memcpy (names, a, size);
6323 names += size;
6324 }
6325 memcpy (names, "@plt", sizeof ("@plt"));
6326 names += sizeof ("@plt");
6327 s++;
6328 }
6329
6330 for (j = 0; plts[j].name != NULL; j++)
6331 if (plts[j].contents != NULL)
6332 free (plts[j].contents);
6333
6334 free (dynrelbuf);
6335
6336 return count;
6337 }
6338
6339 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6340
6341 static bfd_boolean
6342 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
6343 {
6344 if (h->plt.offset != (bfd_vma) -1
6345 && !h->def_regular
6346 && !h->pointer_equality_needed)
6347 return FALSE;
6348
6349 return _bfd_elf_hash_symbol (h);
6350 }
6351
6352 /* Parse i386 GNU properties. */
6353
6354 static enum elf_property_kind
6355 elf_i386_parse_gnu_properties (bfd *abfd, unsigned int type,
6356 bfd_byte *ptr, unsigned int datasz)
6357 {
6358 elf_property *prop;
6359
6360 switch (type)
6361 {
6362 case GNU_PROPERTY_X86_ISA_1_USED:
6363 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6364 if (datasz != 4)
6365 {
6366 _bfd_error_handler
6367 ((type == GNU_PROPERTY_X86_ISA_1_USED
6368 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6369 : _("error: %B: <corrupt x86 ISA needed size: 0x%x>")),
6370 abfd, datasz);
6371 return property_corrupt;
6372 }
6373 prop = _bfd_elf_get_property (abfd, type, datasz);
6374 /* Combine properties of the same type. */
6375 prop->u.number |= bfd_h_get_32 (abfd, ptr);
6376 prop->pr_kind = property_number;
6377 break;
6378
6379 default:
6380 return property_ignored;
6381 }
6382
6383 return property_number;
6384 }
6385
6386 /* Merge i386 GNU property BPROP with APROP. If APROP isn't NULL,
6387 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6388 should be merged with ABFD. */
6389
6390 static bfd_boolean
6391 elf_i386_merge_gnu_properties (bfd *abfd ATTRIBUTE_UNUSED,
6392 elf_property *aprop,
6393 elf_property *bprop)
6394 {
6395 unsigned int number;
6396 bfd_boolean updated = FALSE;
6397 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
6398
6399 switch (pr_type)
6400 {
6401 case GNU_PROPERTY_X86_ISA_1_USED:
6402 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6403 if (aprop != NULL && bprop != NULL)
6404 {
6405 number = aprop->u.number;
6406 aprop->u.number = number | bprop->u.number;
6407 updated = number != (unsigned int) aprop->u.number;
6408 }
6409 else
6410 {
6411 /* Return TRUE if APROP is NULL to indicate that BPROP should
6412 be added to ABFD. */
6413 updated = aprop == NULL;
6414 }
6415 break;
6416
6417 default:
6418 /* Never should happen. */
6419 abort ();
6420 }
6421
6422 return updated;
6423 }
6424
6425 /* Set up i386 GNU properties. Return the first relocatable ELF input
6426 with GNU properties if found. Otherwise, return NULL. */
6427
6428 static bfd *
6429 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
6430 {
6431 bfd_boolean normal_target;
6432 asection *sec, *pltsec;
6433 bfd *dynobj;
6434 unsigned int plt_alignment;
6435 struct elf_i386_link_hash_table *htab;
6436 bfd *pbfd = _bfd_elf_link_setup_gnu_properties (info);
6437
6438 if (bfd_link_relocatable (info))
6439 return pbfd;
6440
6441 htab = elf_i386_hash_table (info);
6442 if (htab == NULL)
6443 return pbfd;
6444
6445 dynobj = htab->elf.dynobj;
6446
6447 /* Set htab->elf.dynobj here so that there is no need to check and
6448 set it in check_relocs. */
6449 if (dynobj == NULL)
6450 {
6451 bfd *abfd;
6452
6453 /* Find a normal input file to hold linker created
6454 sections. */
6455 for (abfd = info->input_bfds;
6456 abfd != NULL;
6457 abfd = abfd->link.next)
6458 if ((abfd->flags
6459 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
6460 {
6461 htab->elf.dynobj = abfd;
6462 dynobj = abfd;
6463 break;
6464 }
6465 }
6466
6467 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
6468 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
6469 canonical function address. */
6470 htab->plt.has_plt0 = 1;
6471 normal_target = FALSE;
6472
6473 switch (get_elf_i386_backend_data (info->output_bfd)->os)
6474 {
6475 case is_normal:
6476 htab->lazy_plt = &elf_i386_lazy_plt;
6477 htab->non_lazy_plt = &elf_i386_non_lazy_plt;
6478 normal_target = TRUE;
6479 break;
6480 case is_vxworks:
6481 htab->lazy_plt = &elf_i386_lazy_plt;
6482 htab->non_lazy_plt = NULL;
6483 if (!elf_vxworks_create_dynamic_sections (dynobj, info,
6484 &htab->srelplt2))
6485 info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
6486 break;
6487 case is_nacl:
6488 htab->lazy_plt = &elf_i386_nacl_plt;
6489 htab->non_lazy_plt = NULL;
6490 break;
6491 }
6492
6493 pltsec = htab->elf.splt;
6494
6495 /* If the non-lazy PLT is available, use it for all PLT entries if
6496 there are no PLT0 or no .plt section. */
6497 if (htab->non_lazy_plt != NULL
6498 && (!htab->plt.has_plt0 || pltsec == NULL))
6499 {
6500 if (bfd_link_pic (info))
6501 htab->plt.plt_entry
6502 = htab->non_lazy_plt->pic_plt_entry;
6503 else
6504 htab->plt.plt_entry
6505 = htab->non_lazy_plt->plt_entry;
6506 htab->plt.plt_entry_size
6507 = htab->non_lazy_plt->plt_entry_size;
6508 htab->plt.plt_got_offset
6509 = htab->non_lazy_plt->plt_got_offset;
6510 htab->plt.eh_frame_plt_size
6511 = htab->non_lazy_plt->eh_frame_plt_size;
6512 htab->plt.eh_frame_plt
6513 = htab->non_lazy_plt->eh_frame_plt;
6514 }
6515 else
6516 {
6517 if (bfd_link_pic (info))
6518 {
6519 htab->plt.plt0_entry
6520 = htab->lazy_plt->pic_plt0_entry;
6521 htab->plt.plt_entry
6522 = htab->lazy_plt->pic_plt_entry;
6523 }
6524 else
6525 {
6526 htab->plt.plt0_entry
6527 = htab->lazy_plt->plt0_entry;
6528 htab->plt.plt_entry
6529 = htab->lazy_plt->plt_entry;
6530 }
6531 htab->plt.plt_entry_size
6532 = htab->lazy_plt->plt_entry_size;
6533 htab->plt.plt_got_offset
6534 = htab->lazy_plt->plt_got_offset;
6535 htab->plt.eh_frame_plt_size
6536 = htab->lazy_plt->eh_frame_plt_size;
6537 htab->plt.eh_frame_plt
6538 = htab->lazy_plt->eh_frame_plt;
6539 }
6540
6541 /* Return if there are no normal input files. */
6542 if (dynobj == NULL)
6543 return pbfd;
6544
6545 /* Since create_dynamic_sections isn't always called, but GOT
6546 relocations need GOT relocations, create them here so that we
6547 don't need to do it in check_relocs. */
6548 if (htab->elf.sgot == NULL
6549 && !_bfd_elf_create_got_section (dynobj, info))
6550 info->callbacks->einfo (_("%F: failed to create GOT sections\n"));
6551
6552 /* Create the ifunc sections here so that check_relocs can be
6553 simplified. */
6554 if (!_bfd_elf_create_ifunc_sections (dynobj, info))
6555 info->callbacks->einfo (_("%F: failed to create ifunc sections\n"));
6556
6557 plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
6558
6559 if (pltsec != NULL)
6560 {
6561 /* Whe creating executable, set the contents of the .interp
6562 section to the interpreter. */
6563 if (bfd_link_executable (info) && !info->nointerp)
6564 {
6565 asection *s = bfd_get_linker_section (dynobj, ".interp");
6566 if (s == NULL)
6567 abort ();
6568 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
6569 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
6570 htab->interp = s;
6571 }
6572
6573 /* Don't change PLT section alignment for NaCl since it uses
6574 64-byte PLT entry and sets PLT section alignment to 32
6575 bytes. */
6576 if (normal_target)
6577 {
6578 const struct elf_backend_data *bed
6579 = get_elf_backend_data (dynobj);
6580 flagword pltflags = (bed->dynamic_sec_flags
6581 | SEC_ALLOC
6582 | SEC_CODE
6583 | SEC_LOAD
6584 | SEC_READONLY);
6585 unsigned int non_lazy_plt_alignment
6586 = bfd_log2 (htab->non_lazy_plt->plt_entry_size);
6587
6588 sec = pltsec;
6589 if (!bfd_set_section_alignment (sec->owner, sec,
6590 plt_alignment))
6591 goto error_alignment;
6592
6593 /* Create the GOT procedure linkage table. */
6594 sec = bfd_make_section_anyway_with_flags (dynobj,
6595 ".plt.got",
6596 pltflags);
6597 if (sec == NULL)
6598 info->callbacks->einfo (_("%F: failed to create GOT PLT section\n"));
6599
6600 if (!bfd_set_section_alignment (dynobj, sec,
6601 non_lazy_plt_alignment))
6602 goto error_alignment;
6603
6604 htab->plt_got = sec;
6605 }
6606
6607 if (!info->no_ld_generated_unwind_info)
6608 {
6609 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
6610 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
6611 | SEC_LINKER_CREATED);
6612
6613 sec = bfd_make_section_anyway_with_flags (dynobj,
6614 ".eh_frame",
6615 flags);
6616 if (sec == NULL)
6617 info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n"));
6618
6619 if (!bfd_set_section_alignment (dynobj, sec, 2))
6620 goto error_alignment;
6621
6622 htab->plt_eh_frame = sec;
6623
6624 if (htab->plt_got != NULL)
6625 {
6626 sec = bfd_make_section_anyway_with_flags (dynobj,
6627 ".eh_frame",
6628 flags);
6629 if (sec == NULL)
6630 info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
6631
6632 if (!bfd_set_section_alignment (dynobj, sec, 2))
6633 goto error_alignment;
6634
6635 htab->plt_got_eh_frame = sec;
6636 }
6637 }
6638 }
6639
6640 if (normal_target)
6641 {
6642 /* The .iplt section is used for IFUNC symbols in static
6643 executables. */
6644 sec = htab->elf.iplt;
6645 if (sec != NULL
6646 && !bfd_set_section_alignment (sec->owner, sec,
6647 plt_alignment))
6648 {
6649 error_alignment:
6650 info->callbacks->einfo (_("%F%A: failed to align section\n"),
6651 sec);
6652 }
6653 }
6654
6655 return pbfd;
6656 }
6657
6658 #define TARGET_LITTLE_SYM i386_elf32_vec
6659 #define TARGET_LITTLE_NAME "elf32-i386"
6660 #define ELF_ARCH bfd_arch_i386
6661 #define ELF_TARGET_ID I386_ELF_DATA
6662 #define ELF_MACHINE_CODE EM_386
6663 #define ELF_MAXPAGESIZE 0x1000
6664
6665 #define elf_backend_can_gc_sections 1
6666 #define elf_backend_can_refcount 1
6667 #define elf_backend_want_got_plt 1
6668 #define elf_backend_plt_readonly 1
6669 #define elf_backend_want_plt_sym 0
6670 #define elf_backend_got_header_size 12
6671 #define elf_backend_plt_alignment 4
6672 #define elf_backend_dtrel_excludes_plt 1
6673 #define elf_backend_extern_protected_data 1
6674 #define elf_backend_caches_rawsize 1
6675 #define elf_backend_want_dynrelro 1
6676
6677 /* Support RELA for objdump of prelink objects. */
6678 #define elf_info_to_howto elf_i386_info_to_howto_rel
6679 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
6680
6681 #define bfd_elf32_mkobject elf_i386_mkobject
6682
6683 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
6684 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
6685 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
6686 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
6687 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
6688
6689 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
6690 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
6691 #define elf_backend_check_relocs elf_i386_check_relocs
6692 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
6693 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
6694 #define elf_backend_fake_sections elf_i386_fake_sections
6695 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
6696 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
6697 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
6698 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
6699 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
6700 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
6701 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
6702 #define elf_backend_relocate_section elf_i386_relocate_section
6703 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
6704 #define elf_backend_always_size_sections elf_i386_always_size_sections
6705 #define elf_backend_omit_section_dynsym \
6706 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
6707 #define elf_backend_hash_symbol elf_i386_hash_symbol
6708 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
6709 #define elf_backend_parse_gnu_properties elf_i386_parse_gnu_properties
6710 #define elf_backend_merge_gnu_properties elf_i386_merge_gnu_properties
6711 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
6712
6713 #include "elf32-target.h"
6714
6715 /* FreeBSD support. */
6716
6717 #undef TARGET_LITTLE_SYM
6718 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
6719 #undef TARGET_LITTLE_NAME
6720 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
6721 #undef ELF_OSABI
6722 #define ELF_OSABI ELFOSABI_FREEBSD
6723
6724 /* The kernel recognizes executables as valid only if they carry a
6725 "FreeBSD" label in the ELF header. So we put this label on all
6726 executables and (for simplicity) also all other object files. */
6727
6728 static void
6729 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
6730 {
6731 _bfd_elf_post_process_headers (abfd, info);
6732
6733 #ifdef OLD_FREEBSD_ABI_LABEL
6734 {
6735 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
6736 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
6737 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
6738 }
6739 #endif
6740 }
6741
6742 #undef elf_backend_post_process_headers
6743 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
6744 #undef elf32_bed
6745 #define elf32_bed elf32_i386_fbsd_bed
6746
6747 #undef elf_backend_add_symbol_hook
6748
6749 #include "elf32-target.h"
6750
6751 /* Solaris 2. */
6752
6753 #undef TARGET_LITTLE_SYM
6754 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
6755 #undef TARGET_LITTLE_NAME
6756 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
6757
6758 #undef elf_backend_post_process_headers
6759
6760 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
6761 objects won't be recognized. */
6762 #undef ELF_OSABI
6763
6764 #undef elf32_bed
6765 #define elf32_bed elf32_i386_sol2_bed
6766
6767 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
6768 boundary. */
6769 #undef elf_backend_static_tls_alignment
6770 #define elf_backend_static_tls_alignment 8
6771
6772 /* The Solaris 2 ABI requires a plt symbol on all platforms.
6773
6774 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
6775 File, p.63. */
6776 #undef elf_backend_want_plt_sym
6777 #define elf_backend_want_plt_sym 1
6778
6779 #undef elf_backend_strtab_flags
6780 #define elf_backend_strtab_flags SHF_STRINGS
6781
6782 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
6783 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
6784 FALSE otherwise. ISECTION is the best guess matching section from the
6785 input bfd IBFD, but it might be NULL. */
6786
6787 static bfd_boolean
6788 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
6789 bfd *obfd ATTRIBUTE_UNUSED,
6790 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
6791 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
6792 {
6793 /* PR 19938: FIXME: Need to add code for setting the sh_info
6794 and sh_link fields of Solaris specific section types. */
6795 return FALSE;
6796
6797 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
6798 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
6799
6800 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
6801
6802 The following values should be set:
6803
6804 Type Link Info
6805 -----------------------------------------------------------------------------
6806 SHT_SUNW_ancillary The section header index of 0
6807 [0x6fffffee] the associated string table.
6808
6809 SHT_SUNW_capinfo The section header index of For a dynamic object, the
6810 [0x6ffffff0] the associated symbol table. section header index of
6811 the associated
6812 SHT_SUNW_capchain table,
6813 otherwise 0.
6814
6815 SHT_SUNW_symsort The section header index of 0
6816 [0x6ffffff1] the associated symbol table.
6817
6818 SHT_SUNW_tlssort The section header index of 0
6819 [0x6ffffff2] the associated symbol table.
6820
6821 SHT_SUNW_LDYNSYM The section header index of One greater than the
6822 [0x6ffffff3] the associated string table. symbol table index of the
6823 This index is the same string last local symbol,
6824 table used by the SHT_DYNSYM STB_LOCAL. Since
6825 section. SHT_SUNW_LDYNSYM only
6826 contains local symbols,
6827 sh_info is equivalent to
6828 the number of symbols in
6829 the table.
6830
6831 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
6832 [0x6ffffff5] the section header index of to named strings, the
6833 the associated section header index of
6834 SHT_SUNW_capinfo table, the associated string
6835 otherwise 0. table, otherwise 0.
6836
6837 SHT_SUNW_move The section header index of 0
6838 [0x6ffffffa] the associated symbol table.
6839
6840 SHT_SUNW_COMDAT 0 0
6841 [0x6ffffffb]
6842
6843 SHT_SUNW_syminfo The section header index of The section header index
6844 [0x6ffffffc] the associated symbol table. of the associated
6845 .dynamic section.
6846
6847 SHT_SUNW_verdef The section header index of The number of version
6848 [0x6ffffffd] the associated string table. definitions within the
6849 section.
6850
6851 SHT_SUNW_verneed The section header index of The number of version
6852 [0x6ffffffe] the associated string table. dependencies within the
6853 section.
6854
6855 SHT_SUNW_versym The section header index of 0
6856 [0x6fffffff] the associated symbol table. */
6857 }
6858
6859 #undef elf_backend_copy_special_section_fields
6860 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
6861
6862 #include "elf32-target.h"
6863
6864 /* Intel MCU support. */
6865
6866 static bfd_boolean
6867 elf32_iamcu_elf_object_p (bfd *abfd)
6868 {
6869 /* Set the right machine number for an IAMCU elf32 file. */
6870 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
6871 return TRUE;
6872 }
6873
6874 #undef TARGET_LITTLE_SYM
6875 #define TARGET_LITTLE_SYM iamcu_elf32_vec
6876 #undef TARGET_LITTLE_NAME
6877 #define TARGET_LITTLE_NAME "elf32-iamcu"
6878 #undef ELF_ARCH
6879 #define ELF_ARCH bfd_arch_iamcu
6880
6881 #undef ELF_MACHINE_CODE
6882 #define ELF_MACHINE_CODE EM_IAMCU
6883
6884 #undef ELF_OSABI
6885
6886 #undef elf32_bed
6887 #define elf32_bed elf32_iamcu_bed
6888
6889 #undef elf_backend_object_p
6890 #define elf_backend_object_p elf32_iamcu_elf_object_p
6891
6892 #undef elf_backend_static_tls_alignment
6893
6894 #undef elf_backend_want_plt_sym
6895 #define elf_backend_want_plt_sym 0
6896
6897 #undef elf_backend_strtab_flags
6898 #undef elf_backend_copy_special_section_fields
6899
6900 #include "elf32-target.h"
6901
6902 /* Restore defaults. */
6903 #undef ELF_ARCH
6904 #define ELF_ARCH bfd_arch_i386
6905 #undef ELF_MACHINE_CODE
6906 #define ELF_MACHINE_CODE EM_386
6907
6908 /* Native Client support. */
6909
6910 #undef TARGET_LITTLE_SYM
6911 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
6912 #undef TARGET_LITTLE_NAME
6913 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
6914 #undef elf32_bed
6915 #define elf32_bed elf32_i386_nacl_bed
6916
6917 #undef ELF_MAXPAGESIZE
6918 #define ELF_MAXPAGESIZE 0x10000
6919
6920 /* Restore defaults. */
6921 #undef ELF_OSABI
6922 #undef elf_backend_want_plt_sym
6923 #define elf_backend_want_plt_sym 0
6924 #undef elf_backend_post_process_headers
6925 #undef elf_backend_static_tls_alignment
6926
6927 /* NaCl uses substantially different PLT entries for the same effects. */
6928
6929 #undef elf_backend_plt_alignment
6930 #define elf_backend_plt_alignment 5
6931 #define NACL_PLT_ENTRY_SIZE 64
6932 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
6933
6934 static const bfd_byte elf_i386_nacl_plt0_entry[] =
6935 {
6936 0xff, 0x35, /* pushl contents of address */
6937 0, 0, 0, 0, /* replaced with address of .got + 4. */
6938 0x8b, 0x0d, /* movl contents of address, %ecx */
6939 0, 0, 0, 0, /* replaced with address of .got + 8. */
6940 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6941 0xff, 0xe1 /* jmp *%ecx */
6942 };
6943
6944 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
6945 {
6946 0x8b, 0x0d, /* movl contents of address, %ecx */
6947 0, 0, 0, 0, /* replaced with GOT slot address. */
6948 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
6949 0xff, 0xe1, /* jmp *%ecx */
6950
6951 /* Pad to the next 32-byte boundary with nop instructions. */
6952 0x90,
6953 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6954 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6955
6956 /* Lazy GOT entries point here (32-byte aligned). */
6957 0x68, /* pushl immediate */
6958 0, 0, 0, 0, /* replaced with reloc offset. */
6959 0xe9, /* jmp relative */
6960 0, 0, 0, 0, /* replaced with offset to .plt. */
6961
6962 /* Pad to the next 32-byte boundary with nop instructions. */
6963 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6964 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6965 0x90, 0x90
6966 };
6967
6968 static const bfd_byte
6969 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
6970 {
6971 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
6972 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
6973 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
6974 0xff, 0xe1, /* jmp *%ecx */
6975
6976 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
6977 so pad to that size with nop instructions. */
6978 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
6979 };
6980
6981 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
6982 {
6983 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
6984 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
6985 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
6986 0xff, 0xe1, /* jmp *%ecx */
6987
6988 /* Pad to the next 32-byte boundary with nop instructions. */
6989 0x90,
6990 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6991 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6992
6993 /* Lazy GOT entries point here (32-byte aligned). */
6994 0x68, /* pushl immediate */
6995 0, 0, 0, 0, /* replaced with offset into relocation table. */
6996 0xe9, /* jmp relative */
6997 0, 0, 0, 0, /* replaced with offset to start of .plt. */
6998
6999 /* Pad to the next 32-byte boundary with nop instructions. */
7000 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7001 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7002 0x90, 0x90
7003 };
7004
7005 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
7006 {
7007 #if (PLT_CIE_LENGTH != 20 \
7008 || PLT_FDE_LENGTH != 36 \
7009 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7010 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7011 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
7012 #endif
7013 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
7014 0, 0, 0, 0, /* CIE ID */
7015 1, /* CIE version */
7016 'z', 'R', 0, /* Augmentation string */
7017 1, /* Code alignment factor */
7018 0x7c, /* Data alignment factor: -4 */
7019 8, /* Return address column */
7020 1, /* Augmentation size */
7021 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
7022 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
7023 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
7024 DW_CFA_nop, DW_CFA_nop,
7025
7026 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
7027 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
7028 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
7029 0, 0, 0, 0, /* .plt size goes here */
7030 0, /* Augmentation size */
7031 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
7032 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7033 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
7034 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7035 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
7036 13, /* Block length */
7037 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
7038 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
7039 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
7040 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
7041 DW_CFA_nop, DW_CFA_nop
7042 };
7043
7044 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt =
7045 {
7046 elf_i386_nacl_plt0_entry, /* plt0_entry */
7047 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
7048 2, /* plt0_got1_offset */
7049 8, /* plt0_got2_offset */
7050 elf_i386_nacl_plt_entry, /* plt_entry */
7051 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
7052 2, /* plt_got_offset */
7053 33, /* plt_reloc_offset */
7054 38, /* plt_plt_offset */
7055 32, /* plt_lazy_offset */
7056 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
7057 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
7058 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
7059 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
7060 };
7061
7062 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
7063 {
7064 0x90, /* plt0_pad_byte: nop insn */
7065 is_nacl /* os */
7066 };
7067
7068 static bfd_boolean
7069 elf32_i386_nacl_elf_object_p (bfd *abfd)
7070 {
7071 /* Set the right machine number for a NaCl i386 ELF32 file. */
7072 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
7073 return TRUE;
7074 }
7075
7076 #undef elf_backend_arch_data
7077 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
7078
7079 #undef elf_backend_object_p
7080 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
7081 #undef elf_backend_modify_segment_map
7082 #define elf_backend_modify_segment_map nacl_modify_segment_map
7083 #undef elf_backend_modify_program_headers
7084 #define elf_backend_modify_program_headers nacl_modify_program_headers
7085 #undef elf_backend_final_write_processing
7086 #define elf_backend_final_write_processing nacl_final_write_processing
7087
7088 #include "elf32-target.h"
7089
7090 /* Restore defaults. */
7091 #undef elf_backend_object_p
7092 #undef elf_backend_modify_segment_map
7093 #undef elf_backend_modify_program_headers
7094 #undef elf_backend_final_write_processing
7095
7096 /* VxWorks support. */
7097
7098 #undef TARGET_LITTLE_SYM
7099 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
7100 #undef TARGET_LITTLE_NAME
7101 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
7102 #undef ELF_OSABI
7103 #undef ELF_MAXPAGESIZE
7104 #define ELF_MAXPAGESIZE 0x1000
7105 #undef elf_backend_plt_alignment
7106 #define elf_backend_plt_alignment 4
7107
7108 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
7109 {
7110 0x90, /* plt0_pad_byte */
7111 is_vxworks /* os */
7112 };
7113
7114 #undef elf_backend_arch_data
7115 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
7116
7117 #undef elf_backend_relocs_compatible
7118 #undef elf_backend_add_symbol_hook
7119 #define elf_backend_add_symbol_hook \
7120 elf_vxworks_add_symbol_hook
7121 #undef elf_backend_link_output_symbol_hook
7122 #define elf_backend_link_output_symbol_hook \
7123 elf_vxworks_link_output_symbol_hook
7124 #undef elf_backend_emit_relocs
7125 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
7126 #undef elf_backend_final_write_processing
7127 #define elf_backend_final_write_processing \
7128 elf_vxworks_final_write_processing
7129 #undef elf_backend_static_tls_alignment
7130
7131 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7132 define it. */
7133 #undef elf_backend_want_plt_sym
7134 #define elf_backend_want_plt_sym 1
7135
7136 #undef elf32_bed
7137 #define elf32_bed elf32_i386_vxworks_bed
7138
7139 #include "elf32-target.h"
GDB Binutils - Deliverables
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