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x86: Resolve local undefined weak symbol to 0
[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 /* The first entry in an absolute IBT-enabled lazy procedure linkage
621 table looks like this. */
622
623 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
624 {
625 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
626 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
627 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
628 };
629
630 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
631 table look like this. Subsequent entries for a PIC IBT-enabled lazy
632 procedure linkage table are the same. */
633
634 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
635 {
636 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
637 0x68, 0, 0, 0, 0, /* pushl immediate */
638 0xe9, 0, 0, 0, 0, /* jmp relative */
639 0x66, 0x90 /* xchg %ax,%ax */
640 };
641
642 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
643 look like. */
644
645 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
646 {
647 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
648 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
649 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
650 };
651
652 /* Entries for branches with IBT-enabled in the absolute non-lazey
653 procedure linkage table look like this. They have the same size
654 as the lazy PLT entry. */
655
656 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
657 {
658 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
659 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
660 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
661 };
662
663 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
664 linkage table look like this. They have the same size as the lazy
665 PLT entry. */
666
667 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
668 {
669 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
670 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
671 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
672 };
673
674 /* .eh_frame covering the lazy .plt section. */
675
676 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
677 {
678 #define PLT_CIE_LENGTH 20
679 #define PLT_FDE_LENGTH 36
680 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
681 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
682 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
683 0, 0, 0, 0, /* CIE ID */
684 1, /* CIE version */
685 'z', 'R', 0, /* Augmentation string */
686 1, /* Code alignment factor */
687 0x7c, /* Data alignment factor */
688 8, /* Return address column */
689 1, /* Augmentation size */
690 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
691 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
692 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
693 DW_CFA_nop, DW_CFA_nop,
694
695 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
696 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
697 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
698 0, 0, 0, 0, /* .plt size goes here */
699 0, /* Augmentation size */
700 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
701 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
702 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
703 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
704 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
705 11, /* Block length */
706 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
707 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
708 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
709 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
710 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
711 };
712
713 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
714
715 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
716 {
717 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
718 0, 0, 0, 0, /* CIE ID */
719 1, /* CIE version */
720 'z', 'R', 0, /* Augmentation string */
721 1, /* Code alignment factor */
722 0x7c, /* Data alignment factor */
723 8, /* Return address column */
724 1, /* Augmentation size */
725 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
726 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
727 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
728 DW_CFA_nop, DW_CFA_nop,
729
730 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
731 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
732 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
733 0, 0, 0, 0, /* .plt size goes here */
734 0, /* Augmentation size */
735 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
736 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
737 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
738 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
739 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
740 11, /* Block length */
741 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
742 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
743 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
744 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
745 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
746 };
747
748 /* .eh_frame covering the non-lazy .plt section. */
749
750 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
751 {
752 #define PLT_GOT_FDE_LENGTH 16
753 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
754 0, 0, 0, 0, /* CIE ID */
755 1, /* CIE version */
756 'z', 'R', 0, /* Augmentation string */
757 1, /* Code alignment factor */
758 0x7c, /* Data alignment factor */
759 8, /* Return address column */
760 1, /* Augmentation size */
761 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
762 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
763 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
764 DW_CFA_nop, DW_CFA_nop,
765
766 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
767 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
768 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
769 0, 0, 0, 0, /* non-lazy .plt size goes here */
770 0, /* Augmentation size */
771 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
772 };
773
774 struct elf_i386_lazy_plt_layout
775 {
776 /* The first entry in an absolute lazy procedure linkage table looks
777 like this. */
778 const bfd_byte *plt0_entry;
779 unsigned int plt0_entry_size;
780
781 /* Offsets into plt0_entry that are to be replaced with GOT[1] and
782 GOT[2]. */
783 unsigned int plt0_got1_offset;
784 unsigned int plt0_got2_offset;
785
786 /* Later entries in an absolute lazy procedure linkage table look
787 like this. */
788 const bfd_byte *plt_entry;
789 unsigned int plt_entry_size;
790
791 /* Offsets into plt_entry that are to be replaced with... */
792 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
793 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
794 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
795
796 /* Offset into plt_entry where the initial value of the GOT entry
797 points. */
798 unsigned int plt_lazy_offset;
799
800 /* The first entry in a PIC lazy procedure linkage table looks like
801 this. */
802 const bfd_byte *pic_plt0_entry;
803
804 /* Subsequent entries in a PIC lazy procedure linkage table look
805 like this. */
806 const bfd_byte *pic_plt_entry;
807
808 /* .eh_frame covering the lazy .plt section. */
809 const bfd_byte *eh_frame_plt;
810 unsigned int eh_frame_plt_size;
811 };
812
813 struct elf_i386_non_lazy_plt_layout
814 {
815 /* Entries in an absolute non-lazy procedure linkage table look like
816 this. */
817 const bfd_byte *plt_entry;
818 /* Entries in a PIC non-lazy procedure linkage table look like this. */
819 const bfd_byte *pic_plt_entry;
820
821 unsigned int plt_entry_size;
822
823 /* Offsets into plt_entry that are to be replaced with... */
824 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
825
826 /* .eh_frame covering the non-lazy .plt section. */
827 const bfd_byte *eh_frame_plt;
828 unsigned int eh_frame_plt_size;
829 };
830
831 struct elf_i386_plt_layout
832 {
833 /* The first entry in a lazy procedure linkage table looks like this. */
834 const bfd_byte *plt0_entry;
835 /* Entries in a procedure linkage table look like this. */
836 const bfd_byte *plt_entry;
837 unsigned int plt_entry_size;
838
839 /* 1 has PLT0. */
840 unsigned int has_plt0;
841
842 /* Offsets into plt_entry that are to be replaced with... */
843 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
844
845 /* .eh_frame covering the .plt section. */
846 const bfd_byte *eh_frame_plt;
847 unsigned int eh_frame_plt_size;
848 };
849
850 /* These are the standard parameters. */
851 static const struct elf_i386_lazy_plt_layout elf_i386_lazy_plt =
852 {
853 elf_i386_lazy_plt0_entry, /* plt0_entry */
854 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
855 2, /* plt0_got1_offset */
856 8, /* plt0_got2_offset */
857 elf_i386_lazy_plt_entry, /* plt_entry */
858 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
859 2, /* plt_got_offset */
860 7, /* plt_reloc_offset */
861 12, /* plt_plt_offset */
862 6, /* plt_lazy_offset */
863 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
864 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
865 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
866 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
867 };
868
869 static const struct elf_i386_non_lazy_plt_layout elf_i386_non_lazy_plt =
870 {
871 elf_i386_non_lazy_plt_entry, /* plt_entry */
872 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
873 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
874 2, /* plt_got_offset */
875 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
876 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
877 };
878
879 static const struct elf_i386_lazy_plt_layout elf_i386_lazy_ibt_plt =
880 {
881 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
882 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
883 2, /* plt0_got1_offset */
884 8, /* plt0_got2_offset */
885 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
886 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
887 4+2, /* plt_got_offset */
888 4+1, /* plt_reloc_offset */
889 4+6, /* plt_plt_offset */
890 0, /* plt_lazy_offset */
891 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
892 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
893 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
894 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
895 };
896
897 static const struct elf_i386_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
898 {
899 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
900 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
901 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
902 4+2, /* plt_got_offset */
903 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
904 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
905 };
906 \f
907
908 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
909 for the PLTResolve stub and then for each PLT entry. */
910 #define PLTRESOLVE_RELOCS_SHLIB 0
911 #define PLTRESOLVE_RELOCS 2
912 #define PLT_NON_JUMP_SLOT_RELOCS 2
913
914 /* Architecture-specific backend data for i386. */
915
916 struct elf_i386_backend_data
917 {
918 /* Value used to fill the unused bytes of the first PLT entry. */
919 bfd_byte plt0_pad_byte;
920
921 /* Target system. */
922 enum
923 {
924 is_normal,
925 is_vxworks,
926 is_nacl
927 } os;
928 };
929
930 #define get_elf_i386_backend_data(abfd) \
931 ((const struct elf_i386_backend_data *) \
932 get_elf_backend_data (abfd)->arch_data)
933
934 /* These are the standard parameters. */
935 static const struct elf_i386_backend_data elf_i386_arch_bed =
936 {
937 0, /* plt0_pad_byte */
938 is_normal /* os */
939 };
940
941 #define elf_backend_arch_data &elf_i386_arch_bed
942
943 /* Is a undefined weak symbol which is resolved to 0. Reference to an
944 undefined weak symbol is resolved to 0 when building executable if
945 it isn't dynamic and
946 1. Has non-GOT/non-PLT relocations in text section. Or
947 2. Has no GOT/PLT relocation.
948 Local undefined weak symbol is always resolved to 0.
949 */
950 #define UNDEFINED_WEAK_RESOLVED_TO_ZERO(INFO, GOT_RELOC, EH) \
951 ((EH)->elf.root.type == bfd_link_hash_undefweak \
952 && ((EH)->elf.forced_local \
953 || (bfd_link_executable (INFO) \
954 && (elf_i386_hash_table (INFO)->interp == NULL \
955 || !(GOT_RELOC) \
956 || (EH)->has_non_got_reloc \
957 || !(INFO)->dynamic_undefined_weak))))
958
959 /* i386 ELF linker hash entry. */
960
961 struct elf_i386_link_hash_entry
962 {
963 struct elf_link_hash_entry elf;
964
965 /* Track dynamic relocs copied for this symbol. */
966 struct elf_dyn_relocs *dyn_relocs;
967
968 #define GOT_UNKNOWN 0
969 #define GOT_NORMAL 1
970 #define GOT_TLS_GD 2
971 #define GOT_TLS_IE 4
972 #define GOT_TLS_IE_POS 5
973 #define GOT_TLS_IE_NEG 6
974 #define GOT_TLS_IE_BOTH 7
975 #define GOT_TLS_GDESC 8
976 #define GOT_TLS_GD_BOTH_P(type) \
977 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
978 #define GOT_TLS_GD_P(type) \
979 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
980 #define GOT_TLS_GDESC_P(type) \
981 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
982 #define GOT_TLS_GD_ANY_P(type) \
983 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
984 unsigned char tls_type;
985
986 /* Symbol is referenced by R_386_GOTOFF relocation. */
987 unsigned int gotoff_ref : 1;
988
989 /* Symbol has GOT or PLT relocations. */
990 unsigned int has_got_reloc : 1;
991
992 /* Symbol has non-GOT/non-PLT relocations in text sections. */
993 unsigned int has_non_got_reloc : 1;
994
995 /* Don't call finish_dynamic_symbol on this symbol. */
996 unsigned int no_finish_dynamic_symbol : 1;
997
998 /* 0: symbol isn't ___tls_get_addr.
999 1: symbol is ___tls_get_addr.
1000 2: symbol is unknown. */
1001 unsigned int tls_get_addr : 2;
1002
1003 /* Reference count of C/C++ function pointer relocations in read-write
1004 section which can be resolved at run-time. */
1005 bfd_signed_vma func_pointer_refcount;
1006
1007 /* Information about the GOT PLT entry. Filled when there are both
1008 GOT and PLT relocations against the same function. */
1009 union gotplt_union plt_got;
1010
1011 /* Information about the second PLT entry. */
1012 union gotplt_union plt_second;
1013
1014 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
1015 starting at the end of the jump table. */
1016 bfd_vma tlsdesc_got;
1017 };
1018
1019 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
1020
1021 struct elf_i386_obj_tdata
1022 {
1023 struct elf_obj_tdata root;
1024
1025 /* tls_type for each local got entry. */
1026 char *local_got_tls_type;
1027
1028 /* GOTPLT entries for TLS descriptors. */
1029 bfd_vma *local_tlsdesc_gotent;
1030 };
1031
1032 #define elf_i386_tdata(abfd) \
1033 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
1034
1035 #define elf_i386_local_got_tls_type(abfd) \
1036 (elf_i386_tdata (abfd)->local_got_tls_type)
1037
1038 #define elf_i386_local_tlsdesc_gotent(abfd) \
1039 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
1040
1041 #define is_i386_elf(bfd) \
1042 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
1043 && elf_tdata (bfd) != NULL \
1044 && elf_object_id (bfd) == I386_ELF_DATA)
1045
1046 static bfd_boolean
1047 elf_i386_mkobject (bfd *abfd)
1048 {
1049 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
1050 I386_ELF_DATA);
1051 }
1052
1053 /* i386 ELF linker hash table. */
1054
1055 struct elf_i386_link_hash_table
1056 {
1057 struct elf_link_hash_table elf;
1058
1059 /* Short-cuts to get to dynamic linker sections. */
1060 asection *interp;
1061 asection *plt_eh_frame;
1062 asection *plt_second;
1063 asection *plt_second_eh_frame;
1064 asection *plt_got;
1065 asection *plt_got_eh_frame;
1066
1067 /* Parameters describing PLT generation. */
1068 struct elf_i386_plt_layout plt;
1069
1070 /* Parameters describing lazy PLT generation. */
1071 const struct elf_i386_lazy_plt_layout *lazy_plt;
1072
1073 /* Parameters describing non-lazy PLT generation. */
1074 const struct elf_i386_non_lazy_plt_layout *non_lazy_plt;
1075
1076 union
1077 {
1078 bfd_signed_vma refcount;
1079 bfd_vma offset;
1080 } tls_ldm_got;
1081
1082 /* The amount of space used by the reserved portion of the sgotplt
1083 section, plus whatever space is used by the jump slots. */
1084 bfd_vma sgotplt_jump_table_size;
1085
1086 /* Small local sym cache. */
1087 struct sym_cache sym_cache;
1088
1089 /* _TLS_MODULE_BASE_ symbol. */
1090 struct bfd_link_hash_entry *tls_module_base;
1091
1092 /* Used by local STT_GNU_IFUNC symbols. */
1093 htab_t loc_hash_table;
1094 void * loc_hash_memory;
1095
1096 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
1097 asection *srelplt2;
1098
1099 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
1100 bfd_vma next_tls_desc_index;
1101
1102 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
1103 bfd_vma next_jump_slot_index;
1104
1105 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
1106 bfd_vma next_irelative_index;
1107
1108 /* TRUE if there are dynamic relocs against IFUNC symbols that apply
1109 to read-only sections. */
1110 bfd_boolean readonly_dynrelocs_against_ifunc;
1111 };
1112
1113 /* Get the i386 ELF linker hash table from a link_info structure. */
1114
1115 #define elf_i386_hash_table(p) \
1116 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
1117 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
1118
1119 #define elf_i386_compute_jump_table_size(htab) \
1120 ((htab)->elf.srelplt->reloc_count * 4)
1121
1122 /* Create an entry in an i386 ELF linker hash table. */
1123
1124 static struct bfd_hash_entry *
1125 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
1126 struct bfd_hash_table *table,
1127 const char *string)
1128 {
1129 /* Allocate the structure if it has not already been allocated by a
1130 subclass. */
1131 if (entry == NULL)
1132 {
1133 entry = (struct bfd_hash_entry *)
1134 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
1135 if (entry == NULL)
1136 return entry;
1137 }
1138
1139 /* Call the allocation method of the superclass. */
1140 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
1141 if (entry != NULL)
1142 {
1143 struct elf_i386_link_hash_entry *eh;
1144
1145 eh = (struct elf_i386_link_hash_entry *) entry;
1146 eh->dyn_relocs = NULL;
1147 eh->tls_type = GOT_UNKNOWN;
1148 eh->gotoff_ref = 0;
1149 eh->has_got_reloc = 0;
1150 eh->has_non_got_reloc = 0;
1151 eh->no_finish_dynamic_symbol = 0;
1152 eh->tls_get_addr = 2;
1153 eh->func_pointer_refcount = 0;
1154 eh->plt_got.offset = (bfd_vma) -1;
1155 eh->tlsdesc_got = (bfd_vma) -1;
1156 }
1157
1158 return entry;
1159 }
1160
1161 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
1162 for local symbol so that we can handle local STT_GNU_IFUNC symbols
1163 as global symbol. We reuse indx and dynstr_index for local symbol
1164 hash since they aren't used by global symbols in this backend. */
1165
1166 static hashval_t
1167 elf_i386_local_htab_hash (const void *ptr)
1168 {
1169 struct elf_link_hash_entry *h
1170 = (struct elf_link_hash_entry *) ptr;
1171 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
1172 }
1173
1174 /* Compare local hash entries. */
1175
1176 static int
1177 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
1178 {
1179 struct elf_link_hash_entry *h1
1180 = (struct elf_link_hash_entry *) ptr1;
1181 struct elf_link_hash_entry *h2
1182 = (struct elf_link_hash_entry *) ptr2;
1183
1184 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
1185 }
1186
1187 /* Find and/or create a hash entry for local symbol. */
1188
1189 static struct elf_link_hash_entry *
1190 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
1191 bfd *abfd, const Elf_Internal_Rela *rel,
1192 bfd_boolean create)
1193 {
1194 struct elf_i386_link_hash_entry e, *ret;
1195 asection *sec = abfd->sections;
1196 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
1197 ELF32_R_SYM (rel->r_info));
1198 void **slot;
1199
1200 e.elf.indx = sec->id;
1201 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1202 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
1203 create ? INSERT : NO_INSERT);
1204
1205 if (!slot)
1206 return NULL;
1207
1208 if (*slot)
1209 {
1210 ret = (struct elf_i386_link_hash_entry *) *slot;
1211 return &ret->elf;
1212 }
1213
1214 ret = (struct elf_i386_link_hash_entry *)
1215 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
1216 sizeof (struct elf_i386_link_hash_entry));
1217 if (ret)
1218 {
1219 memset (ret, 0, sizeof (*ret));
1220 ret->elf.indx = sec->id;
1221 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
1222 ret->elf.dynindx = -1;
1223 ret->func_pointer_refcount = 0;
1224 ret->plt_got.offset = (bfd_vma) -1;
1225 *slot = ret;
1226 }
1227 return &ret->elf;
1228 }
1229
1230 /* Destroy an i386 ELF linker hash table. */
1231
1232 static void
1233 elf_i386_link_hash_table_free (bfd *obfd)
1234 {
1235 struct elf_i386_link_hash_table *htab
1236 = (struct elf_i386_link_hash_table *) obfd->link.hash;
1237
1238 if (htab->loc_hash_table)
1239 htab_delete (htab->loc_hash_table);
1240 if (htab->loc_hash_memory)
1241 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
1242 _bfd_elf_link_hash_table_free (obfd);
1243 }
1244
1245 /* Create an i386 ELF linker hash table. */
1246
1247 static struct bfd_link_hash_table *
1248 elf_i386_link_hash_table_create (bfd *abfd)
1249 {
1250 struct elf_i386_link_hash_table *ret;
1251 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
1252
1253 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
1254 if (ret == NULL)
1255 return NULL;
1256
1257 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1258 elf_i386_link_hash_newfunc,
1259 sizeof (struct elf_i386_link_hash_entry),
1260 I386_ELF_DATA))
1261 {
1262 free (ret);
1263 return NULL;
1264 }
1265
1266 ret->loc_hash_table = htab_try_create (1024,
1267 elf_i386_local_htab_hash,
1268 elf_i386_local_htab_eq,
1269 NULL);
1270 ret->loc_hash_memory = objalloc_create ();
1271 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1272 {
1273 elf_i386_link_hash_table_free (abfd);
1274 return NULL;
1275 }
1276 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1277
1278 return &ret->elf.root;
1279 }
1280
1281 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1282
1283 static void
1284 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1285 struct elf_link_hash_entry *dir,
1286 struct elf_link_hash_entry *ind)
1287 {
1288 struct elf_i386_link_hash_entry *edir, *eind;
1289
1290 edir = (struct elf_i386_link_hash_entry *) dir;
1291 eind = (struct elf_i386_link_hash_entry *) ind;
1292
1293 if (eind->dyn_relocs != NULL)
1294 {
1295 if (edir->dyn_relocs != NULL)
1296 {
1297 struct elf_dyn_relocs **pp;
1298 struct elf_dyn_relocs *p;
1299
1300 /* Add reloc counts against the indirect sym to the direct sym
1301 list. Merge any entries against the same section. */
1302 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1303 {
1304 struct elf_dyn_relocs *q;
1305
1306 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1307 if (q->sec == p->sec)
1308 {
1309 q->pc_count += p->pc_count;
1310 q->count += p->count;
1311 *pp = p->next;
1312 break;
1313 }
1314 if (q == NULL)
1315 pp = &p->next;
1316 }
1317 *pp = edir->dyn_relocs;
1318 }
1319
1320 edir->dyn_relocs = eind->dyn_relocs;
1321 eind->dyn_relocs = NULL;
1322 }
1323
1324 if (ind->root.type == bfd_link_hash_indirect
1325 && dir->got.refcount <= 0)
1326 {
1327 edir->tls_type = eind->tls_type;
1328 eind->tls_type = GOT_UNKNOWN;
1329 }
1330
1331 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1332 generate a R_386_COPY reloc. */
1333 edir->gotoff_ref |= eind->gotoff_ref;
1334
1335 edir->has_got_reloc |= eind->has_got_reloc;
1336 edir->has_non_got_reloc |= eind->has_non_got_reloc;
1337
1338 if (ELIMINATE_COPY_RELOCS
1339 && ind->root.type != bfd_link_hash_indirect
1340 && dir->dynamic_adjusted)
1341 {
1342 /* If called to transfer flags for a weakdef during processing
1343 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1344 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1345 if (dir->versioned != versioned_hidden)
1346 dir->ref_dynamic |= ind->ref_dynamic;
1347 dir->ref_regular |= ind->ref_regular;
1348 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1349 dir->needs_plt |= ind->needs_plt;
1350 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1351 }
1352 else
1353 {
1354 if (eind->func_pointer_refcount > 0)
1355 {
1356 edir->func_pointer_refcount += eind->func_pointer_refcount;
1357 eind->func_pointer_refcount = 0;
1358 }
1359
1360 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1361 }
1362 }
1363
1364 /* Return TRUE if the TLS access code sequence support transition
1365 from R_TYPE. */
1366
1367 static bfd_boolean
1368 elf_i386_check_tls_transition (asection *sec,
1369 bfd_byte *contents,
1370 Elf_Internal_Shdr *symtab_hdr,
1371 struct elf_link_hash_entry **sym_hashes,
1372 unsigned int r_type,
1373 const Elf_Internal_Rela *rel,
1374 const Elf_Internal_Rela *relend)
1375 {
1376 unsigned int val, type, reg;
1377 unsigned long r_symndx;
1378 struct elf_link_hash_entry *h;
1379 bfd_vma offset;
1380 bfd_byte *call;
1381 bfd_boolean indirect_call, tls_get_addr;
1382
1383 offset = rel->r_offset;
1384 switch (r_type)
1385 {
1386 case R_386_TLS_GD:
1387 case R_386_TLS_LDM:
1388 if (offset < 2 || (rel + 1) >= relend)
1389 return FALSE;
1390
1391 indirect_call = FALSE;
1392 call = contents + offset + 4;
1393 val = *(call - 5);
1394 type = *(call - 6);
1395 if (r_type == R_386_TLS_GD)
1396 {
1397 /* Check transition from GD access model. Only
1398 leal foo@tlsgd(,%ebx,1), %eax
1399 call ___tls_get_addr@PLT
1400 or
1401 leal foo@tlsgd(%ebx) %eax
1402 call ___tls_get_addr@PLT
1403 nop
1404 or
1405 leal foo@tlsgd(%reg), %eax
1406 call *___tls_get_addr@GOT(%reg)
1407 which may be converted to
1408 addr32 call ___tls_get_addr
1409 can transit to different access model. */
1410 if ((offset + 10) > sec->size
1411 || (type != 0x8d && type != 0x04))
1412 return FALSE;
1413
1414 if (type == 0x04)
1415 {
1416 /* leal foo@tlsgd(,%ebx,1), %eax
1417 call ___tls_get_addr@PLT */
1418 if (offset < 3)
1419 return FALSE;
1420
1421 if (*(call - 7) != 0x8d
1422 || val != 0x1d
1423 || call[0] != 0xe8)
1424 return FALSE;
1425 }
1426 else
1427 {
1428 /* This must be
1429 leal foo@tlsgd(%ebx), %eax
1430 call ___tls_get_addr@PLT
1431 nop
1432 or
1433 leal foo@tlsgd(%reg), %eax
1434 call *___tls_get_addr@GOT(%reg)
1435 which may be converted to
1436 addr32 call ___tls_get_addr
1437
1438 %eax can't be used as the GOT base register since it
1439 is used to pass parameter to ___tls_get_addr. */
1440 reg = val & 7;
1441 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1442 return FALSE;
1443
1444 indirect_call = call[0] == 0xff;
1445 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
1446 && !(call[0] == 0x67 && call[1] == 0xe8)
1447 && !(indirect_call
1448 && (call[1] & 0xf8) == 0x90
1449 && (call[1] & 0x7) == reg))
1450 return FALSE;
1451 }
1452 }
1453 else
1454 {
1455 /* Check transition from LD access model. Only
1456 leal foo@tlsldm(%ebx), %eax
1457 call ___tls_get_addr@PLT
1458 or
1459 leal foo@tlsldm(%reg), %eax
1460 call *___tls_get_addr@GOT(%reg)
1461 which may be converted to
1462 addr32 call ___tls_get_addr
1463 can transit to different access model. */
1464 if (type != 0x8d || (offset + 9) > sec->size)
1465 return FALSE;
1466
1467 /* %eax can't be used as the GOT base register since it is
1468 used to pass parameter to ___tls_get_addr. */
1469 reg = val & 7;
1470 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
1471 return FALSE;
1472
1473 indirect_call = call[0] == 0xff;
1474 if (!(reg == 3 && call[0] == 0xe8)
1475 && !(call[0] == 0x67 && call[1] == 0xe8)
1476 && !(indirect_call
1477 && (call[1] & 0xf8) == 0x90
1478 && (call[1] & 0x7) == reg))
1479 return FALSE;
1480 }
1481
1482 r_symndx = ELF32_R_SYM (rel[1].r_info);
1483 if (r_symndx < symtab_hdr->sh_info)
1484 return FALSE;
1485
1486 tls_get_addr = FALSE;
1487 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1488 if (h != NULL && h->root.root.string != NULL)
1489 {
1490 struct elf_i386_link_hash_entry *eh
1491 = (struct elf_i386_link_hash_entry *) h;
1492 tls_get_addr = eh->tls_get_addr == 1;
1493 if (eh->tls_get_addr > 1)
1494 {
1495 /* Use strncmp to check ___tls_get_addr since
1496 ___tls_get_addr may be versioned. */
1497 if (strncmp (h->root.root.string, "___tls_get_addr", 15)
1498 == 0)
1499 {
1500 eh->tls_get_addr = 1;
1501 tls_get_addr = TRUE;
1502 }
1503 else
1504 eh->tls_get_addr = 0;
1505 }
1506 }
1507
1508 if (!tls_get_addr)
1509 return FALSE;
1510 else if (indirect_call)
1511 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
1512 else
1513 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1514 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
1515
1516 case R_386_TLS_IE:
1517 /* Check transition from IE access model:
1518 movl foo@indntpoff(%rip), %eax
1519 movl foo@indntpoff(%rip), %reg
1520 addl foo@indntpoff(%rip), %reg
1521 */
1522
1523 if (offset < 1 || (offset + 4) > sec->size)
1524 return FALSE;
1525
1526 /* Check "movl foo@tpoff(%rip), %eax" first. */
1527 val = bfd_get_8 (abfd, contents + offset - 1);
1528 if (val == 0xa1)
1529 return TRUE;
1530
1531 if (offset < 2)
1532 return FALSE;
1533
1534 /* Check movl|addl foo@tpoff(%rip), %reg. */
1535 type = bfd_get_8 (abfd, contents + offset - 2);
1536 return ((type == 0x8b || type == 0x03)
1537 && (val & 0xc7) == 0x05);
1538
1539 case R_386_TLS_GOTIE:
1540 case R_386_TLS_IE_32:
1541 /* Check transition from {IE_32,GOTIE} access model:
1542 subl foo@{tpoff,gontoff}(%reg1), %reg2
1543 movl foo@{tpoff,gontoff}(%reg1), %reg2
1544 addl foo@{tpoff,gontoff}(%reg1), %reg2
1545 */
1546
1547 if (offset < 2 || (offset + 4) > sec->size)
1548 return FALSE;
1549
1550 val = bfd_get_8 (abfd, contents + offset - 1);
1551 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1552 return FALSE;
1553
1554 type = bfd_get_8 (abfd, contents + offset - 2);
1555 return type == 0x8b || type == 0x2b || type == 0x03;
1556
1557 case R_386_TLS_GOTDESC:
1558 /* Check transition from GDesc access model:
1559 leal x@tlsdesc(%ebx), %eax
1560
1561 Make sure it's a leal adding ebx to a 32-bit offset
1562 into any register, although it's probably almost always
1563 going to be eax. */
1564
1565 if (offset < 2 || (offset + 4) > sec->size)
1566 return FALSE;
1567
1568 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1569 return FALSE;
1570
1571 val = bfd_get_8 (abfd, contents + offset - 1);
1572 return (val & 0xc7) == 0x83;
1573
1574 case R_386_TLS_DESC_CALL:
1575 /* Check transition from GDesc access model:
1576 call *x@tlsdesc(%eax)
1577 */
1578 if (offset + 2 <= sec->size)
1579 {
1580 /* Make sure that it's a call *x@tlsdesc(%eax). */
1581 call = contents + offset;
1582 return call[0] == 0xff && call[1] == 0x10;
1583 }
1584
1585 return FALSE;
1586
1587 default:
1588 abort ();
1589 }
1590 }
1591
1592 /* Return TRUE if the TLS access transition is OK or no transition
1593 will be performed. Update R_TYPE if there is a transition. */
1594
1595 static bfd_boolean
1596 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1597 asection *sec, bfd_byte *contents,
1598 Elf_Internal_Shdr *symtab_hdr,
1599 struct elf_link_hash_entry **sym_hashes,
1600 unsigned int *r_type, int tls_type,
1601 const Elf_Internal_Rela *rel,
1602 const Elf_Internal_Rela *relend,
1603 struct elf_link_hash_entry *h,
1604 unsigned long r_symndx,
1605 bfd_boolean from_relocate_section)
1606 {
1607 unsigned int from_type = *r_type;
1608 unsigned int to_type = from_type;
1609 bfd_boolean check = TRUE;
1610
1611 /* Skip TLS transition for functions. */
1612 if (h != NULL
1613 && (h->type == STT_FUNC
1614 || h->type == STT_GNU_IFUNC))
1615 return TRUE;
1616
1617 switch (from_type)
1618 {
1619 case R_386_TLS_GD:
1620 case R_386_TLS_GOTDESC:
1621 case R_386_TLS_DESC_CALL:
1622 case R_386_TLS_IE_32:
1623 case R_386_TLS_IE:
1624 case R_386_TLS_GOTIE:
1625 if (bfd_link_executable (info))
1626 {
1627 if (h == NULL)
1628 to_type = R_386_TLS_LE_32;
1629 else if (from_type != R_386_TLS_IE
1630 && from_type != R_386_TLS_GOTIE)
1631 to_type = R_386_TLS_IE_32;
1632 }
1633
1634 /* When we are called from elf_i386_relocate_section, there may
1635 be additional transitions based on TLS_TYPE. */
1636 if (from_relocate_section)
1637 {
1638 unsigned int new_to_type = to_type;
1639
1640 if (bfd_link_executable (info)
1641 && h != NULL
1642 && h->dynindx == -1
1643 && (tls_type & GOT_TLS_IE))
1644 new_to_type = R_386_TLS_LE_32;
1645
1646 if (to_type == R_386_TLS_GD
1647 || to_type == R_386_TLS_GOTDESC
1648 || to_type == R_386_TLS_DESC_CALL)
1649 {
1650 if (tls_type == GOT_TLS_IE_POS)
1651 new_to_type = R_386_TLS_GOTIE;
1652 else if (tls_type & GOT_TLS_IE)
1653 new_to_type = R_386_TLS_IE_32;
1654 }
1655
1656 /* We checked the transition before when we were called from
1657 elf_i386_check_relocs. We only want to check the new
1658 transition which hasn't been checked before. */
1659 check = new_to_type != to_type && from_type == to_type;
1660 to_type = new_to_type;
1661 }
1662
1663 break;
1664
1665 case R_386_TLS_LDM:
1666 if (bfd_link_executable (info))
1667 to_type = R_386_TLS_LE_32;
1668 break;
1669
1670 default:
1671 return TRUE;
1672 }
1673
1674 /* Return TRUE if there is no transition. */
1675 if (from_type == to_type)
1676 return TRUE;
1677
1678 /* Check if the transition can be performed. */
1679 if (check
1680 && ! elf_i386_check_tls_transition (sec, contents,
1681 symtab_hdr, sym_hashes,
1682 from_type, rel, relend))
1683 {
1684 reloc_howto_type *from, *to;
1685 const char *name;
1686
1687 from = elf_i386_rtype_to_howto (abfd, from_type);
1688 to = elf_i386_rtype_to_howto (abfd, to_type);
1689
1690 if (h)
1691 name = h->root.root.string;
1692 else
1693 {
1694 struct elf_i386_link_hash_table *htab;
1695
1696 htab = elf_i386_hash_table (info);
1697 if (htab == NULL)
1698 name = "*unknown*";
1699 else
1700 {
1701 Elf_Internal_Sym *isym;
1702
1703 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1704 abfd, r_symndx);
1705 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1706 }
1707 }
1708
1709 _bfd_error_handler
1710 /* xgettext:c-format */
1711 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1712 "in section `%A' failed"),
1713 abfd, from->name, to->name, name,
1714 (unsigned long) rel->r_offset, sec);
1715 bfd_set_error (bfd_error_bad_value);
1716 return FALSE;
1717 }
1718
1719 *r_type = to_type;
1720 return TRUE;
1721 }
1722
1723 /* With the local symbol, foo, we convert
1724 mov foo@GOT[(%reg1)], %reg2
1725 to
1726 lea foo[@GOTOFF(%reg1)], %reg2
1727 and convert
1728 call/jmp *foo@GOT[(%reg)]
1729 to
1730 nop call foo/jmp foo nop
1731 When PIC is false, convert
1732 test %reg1, foo@GOT[(%reg2)]
1733 to
1734 test $foo, %reg1
1735 and convert
1736 binop foo@GOT[(%reg1)], %reg2
1737 to
1738 binop $foo, %reg2
1739 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1740 instructions. */
1741
1742 static
1743 bfd_boolean
1744 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1745 bfd_byte *contents,
1746 Elf_Internal_Rela *irel,
1747 struct elf_link_hash_entry *h,
1748 bfd_boolean *converted,
1749 struct bfd_link_info *link_info)
1750 {
1751 struct elf_i386_link_hash_table *htab;
1752 unsigned int opcode;
1753 unsigned int modrm;
1754 bfd_boolean baseless;
1755 Elf_Internal_Sym *isym;
1756 unsigned int addend;
1757 unsigned int nop;
1758 bfd_vma nop_offset;
1759 bfd_boolean is_pic;
1760 bfd_boolean to_reloc_32;
1761 unsigned int r_type;
1762 unsigned int r_symndx;
1763 bfd_vma roff = irel->r_offset;
1764
1765 if (roff < 2)
1766 return TRUE;
1767
1768 /* Addend for R_386_GOT32X relocations must be 0. */
1769 addend = bfd_get_32 (abfd, contents + roff);
1770 if (addend != 0)
1771 return TRUE;
1772
1773 htab = elf_i386_hash_table (link_info);
1774 is_pic = bfd_link_pic (link_info);
1775
1776 r_type = ELF32_R_TYPE (irel->r_info);
1777 r_symndx = ELF32_R_SYM (irel->r_info);
1778
1779 modrm = bfd_get_8 (abfd, contents + roff - 1);
1780 baseless = (modrm & 0xc7) == 0x5;
1781
1782 if (baseless && is_pic)
1783 {
1784 /* For PIC, disallow R_386_GOT32X without a base register
1785 since we don't know what the GOT base is. */
1786 const char *name;
1787
1788 if (h == NULL)
1789 {
1790 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1791 r_symndx);
1792 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1793 }
1794 else
1795 name = h->root.root.string;
1796
1797 _bfd_error_handler
1798 /* xgettext:c-format */
1799 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1800 " register can not be used when making a shared object"),
1801 abfd, name);
1802 return FALSE;
1803 }
1804
1805 opcode = bfd_get_8 (abfd, contents + roff - 2);
1806
1807 /* Convert to R_386_32 if PIC is false or there is no base
1808 register. */
1809 to_reloc_32 = !is_pic || baseless;
1810
1811 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1812 reloc. */
1813 if (h == NULL)
1814 {
1815 if (opcode == 0x0ff)
1816 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1817 goto convert_branch;
1818 else
1819 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1820 "test %reg1, foo@GOT(%reg2)" and
1821 "binop foo@GOT[(%reg1)], %reg2". */
1822 goto convert_load;
1823 }
1824
1825 /* Undefined weak symbol is only bound locally in executable
1826 and its reference is resolved as 0. */
1827 if (UNDEFINED_WEAK_RESOLVED_TO_ZERO (link_info, TRUE,
1828 elf_i386_hash_entry (h)))
1829 {
1830 if (opcode == 0xff)
1831 {
1832 /* No direct branch to 0 for PIC. */
1833 if (is_pic)
1834 return TRUE;
1835 else
1836 goto convert_branch;
1837 }
1838 else
1839 {
1840 /* We can convert load of address 0 to R_386_32. */
1841 to_reloc_32 = TRUE;
1842 goto convert_load;
1843 }
1844 }
1845
1846 if (opcode == 0xff)
1847 {
1848 /* We have "call/jmp *foo@GOT[(%reg)]". */
1849 if ((h->root.type == bfd_link_hash_defined
1850 || h->root.type == bfd_link_hash_defweak)
1851 && SYMBOL_REFERENCES_LOCAL (link_info, h))
1852 {
1853 /* The function is locally defined. */
1854 convert_branch:
1855 /* Convert R_386_GOT32X to R_386_PC32. */
1856 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1857 {
1858 struct elf_i386_link_hash_entry *eh
1859 = (struct elf_i386_link_hash_entry *) h;
1860
1861 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1862 is a nop prefix. */
1863 modrm = 0xe8;
1864 /* To support TLS optimization, always use addr32 prefix
1865 for "call *___tls_get_addr@GOT(%reg)". */
1866 if (eh && eh->tls_get_addr == 1)
1867 {
1868 nop = 0x67;
1869 nop_offset = irel->r_offset - 2;
1870 }
1871 else
1872 {
1873 nop = link_info->call_nop_byte;
1874 if (link_info->call_nop_as_suffix)
1875 {
1876 nop_offset = roff + 3;
1877 irel->r_offset -= 1;
1878 }
1879 else
1880 nop_offset = roff - 2;
1881 }
1882 }
1883 else
1884 {
1885 /* Convert to "jmp foo nop". */
1886 modrm = 0xe9;
1887 nop = NOP_OPCODE;
1888 nop_offset = roff + 3;
1889 irel->r_offset -= 1;
1890 }
1891
1892 bfd_put_8 (abfd, nop, contents + nop_offset);
1893 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1894 /* When converting to PC-relative relocation, we
1895 need to adjust addend by -4. */
1896 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1897 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1898
1899 *converted = TRUE;
1900 }
1901 }
1902 else
1903 {
1904 /* We have "mov foo@GOT[(%re1g)], %reg2",
1905 "test %reg1, foo@GOT(%reg2)" and
1906 "binop foo@GOT[(%reg1)], %reg2".
1907
1908 Avoid optimizing _DYNAMIC since ld.so may use its
1909 link-time address. */
1910 if (h == htab->elf.hdynamic)
1911 return TRUE;
1912
1913 /* def_regular is set by an assignment in a linker script in
1914 bfd_elf_record_link_assignment. start_stop is set on
1915 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1916 if (h->start_stop
1917 || ((h->def_regular
1918 || h->root.type == bfd_link_hash_defined
1919 || h->root.type == bfd_link_hash_defweak)
1920 && SYMBOL_REFERENCES_LOCAL (link_info, h)))
1921 {
1922 convert_load:
1923 if (opcode == 0x8b)
1924 {
1925 if (to_reloc_32)
1926 {
1927 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1928 "mov $foo, %reg2" with R_386_32. */
1929 r_type = R_386_32;
1930 modrm = 0xc0 | (modrm & 0x38) >> 3;
1931 bfd_put_8 (abfd, modrm, contents + roff - 1);
1932 opcode = 0xc7;
1933 }
1934 else
1935 {
1936 /* Convert "mov foo@GOT(%reg1), %reg2" to
1937 "lea foo@GOTOFF(%reg1), %reg2". */
1938 r_type = R_386_GOTOFF;
1939 opcode = 0x8d;
1940 }
1941 }
1942 else
1943 {
1944 /* Only R_386_32 is supported. */
1945 if (!to_reloc_32)
1946 return TRUE;
1947
1948 if (opcode == 0x85)
1949 {
1950 /* Convert "test %reg1, foo@GOT(%reg2)" to
1951 "test $foo, %reg1". */
1952 modrm = 0xc0 | (modrm & 0x38) >> 3;
1953 opcode = 0xf7;
1954 }
1955 else
1956 {
1957 /* Convert "binop foo@GOT(%reg1), %reg2" to
1958 "binop $foo, %reg2". */
1959 modrm = (0xc0
1960 | (modrm & 0x38) >> 3
1961 | (opcode & 0x3c));
1962 opcode = 0x81;
1963 }
1964 bfd_put_8 (abfd, modrm, contents + roff - 1);
1965 r_type = R_386_32;
1966 }
1967
1968 bfd_put_8 (abfd, opcode, contents + roff - 2);
1969 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1970
1971 *converted = TRUE;
1972 }
1973 }
1974
1975 return TRUE;
1976 }
1977
1978 /* Rename some of the generic section flags to better document how they
1979 are used here. */
1980 #define need_convert_load sec_flg0
1981 #define check_relocs_failed sec_flg1
1982
1983 /* Look through the relocs for a section during the first phase, and
1984 calculate needed space in the global offset table, procedure linkage
1985 table, and dynamic reloc sections. */
1986
1987 static bfd_boolean
1988 elf_i386_check_relocs (bfd *abfd,
1989 struct bfd_link_info *info,
1990 asection *sec,
1991 const Elf_Internal_Rela *relocs)
1992 {
1993 struct elf_i386_link_hash_table *htab;
1994 Elf_Internal_Shdr *symtab_hdr;
1995 struct elf_link_hash_entry **sym_hashes;
1996 const Elf_Internal_Rela *rel;
1997 const Elf_Internal_Rela *rel_end;
1998 asection *sreloc;
1999 bfd_byte *contents;
2000
2001 if (bfd_link_relocatable (info))
2002 return TRUE;
2003
2004 /* Don't do anything special with non-loaded, non-alloced sections.
2005 In particular, any relocs in such sections should not affect GOT
2006 and PLT reference counting (ie. we don't allow them to create GOT
2007 or PLT entries), there's no possibility or desire to optimize TLS
2008 relocs, and there's not much point in propagating relocs to shared
2009 libs that the dynamic linker won't relocate. */
2010 if ((sec->flags & SEC_ALLOC) == 0)
2011 return TRUE;
2012
2013 BFD_ASSERT (is_i386_elf (abfd));
2014
2015 htab = elf_i386_hash_table (info);
2016 if (htab == NULL)
2017 {
2018 sec->check_relocs_failed = 1;
2019 return FALSE;
2020 }
2021
2022 /* Get the section contents. */
2023 if (elf_section_data (sec)->this_hdr.contents != NULL)
2024 contents = elf_section_data (sec)->this_hdr.contents;
2025 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2026 {
2027 sec->check_relocs_failed = 1;
2028 return FALSE;
2029 }
2030
2031 symtab_hdr = &elf_symtab_hdr (abfd);
2032 sym_hashes = elf_sym_hashes (abfd);
2033
2034 sreloc = NULL;
2035
2036 rel_end = relocs + sec->reloc_count;
2037 for (rel = relocs; rel < rel_end; rel++)
2038 {
2039 unsigned int r_type;
2040 unsigned long r_symndx;
2041 struct elf_link_hash_entry *h;
2042 struct elf_i386_link_hash_entry *eh;
2043 Elf_Internal_Sym *isym;
2044 const char *name;
2045 bfd_boolean size_reloc;
2046
2047 r_symndx = ELF32_R_SYM (rel->r_info);
2048 r_type = ELF32_R_TYPE (rel->r_info);
2049
2050 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
2051 {
2052 /* xgettext:c-format */
2053 _bfd_error_handler (_("%B: bad symbol index: %d"),
2054 abfd, r_symndx);
2055 goto error_return;
2056 }
2057
2058 if (r_symndx < symtab_hdr->sh_info)
2059 {
2060 /* A local symbol. */
2061 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2062 abfd, r_symndx);
2063 if (isym == NULL)
2064 goto error_return;
2065
2066 /* Check relocation against local STT_GNU_IFUNC symbol. */
2067 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2068 {
2069 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
2070 if (h == NULL)
2071 goto error_return;
2072
2073 /* Fake a STT_GNU_IFUNC symbol. */
2074 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
2075 isym, NULL);
2076 h->type = STT_GNU_IFUNC;
2077 h->def_regular = 1;
2078 h->ref_regular = 1;
2079 h->forced_local = 1;
2080 h->root.type = bfd_link_hash_defined;
2081 }
2082 else
2083 h = NULL;
2084 }
2085 else
2086 {
2087 isym = NULL;
2088 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2089 while (h->root.type == bfd_link_hash_indirect
2090 || h->root.type == bfd_link_hash_warning)
2091 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2092 }
2093
2094 eh = (struct elf_i386_link_hash_entry *) h;
2095 if (h != NULL)
2096 {
2097 if (r_type == R_386_GOTOFF)
2098 eh->gotoff_ref = 1;
2099
2100 /* It is referenced by a non-shared object. */
2101 h->ref_regular = 1;
2102 h->root.non_ir_ref_regular = 1;
2103
2104 if (h->type == STT_GNU_IFUNC)
2105 elf_tdata (info->output_bfd)->has_gnu_symbols
2106 |= elf_gnu_symbol_ifunc;
2107 }
2108
2109 if (! elf_i386_tls_transition (info, abfd, sec, contents,
2110 symtab_hdr, sym_hashes,
2111 &r_type, GOT_UNKNOWN,
2112 rel, rel_end, h, r_symndx, FALSE))
2113 goto error_return;
2114
2115 switch (r_type)
2116 {
2117 case R_386_TLS_LDM:
2118 htab->tls_ldm_got.refcount += 1;
2119 goto create_got;
2120
2121 case R_386_PLT32:
2122 /* This symbol requires a procedure linkage table entry. We
2123 actually build the entry in adjust_dynamic_symbol,
2124 because this might be a case of linking PIC code which is
2125 never referenced by a dynamic object, in which case we
2126 don't need to generate a procedure linkage table entry
2127 after all. */
2128
2129 /* If this is a local symbol, we resolve it directly without
2130 creating a procedure linkage table entry. */
2131 if (h == NULL)
2132 continue;
2133
2134 eh->has_got_reloc = 1;
2135 h->needs_plt = 1;
2136 h->plt.refcount += 1;
2137 break;
2138
2139 case R_386_SIZE32:
2140 size_reloc = TRUE;
2141 goto do_size;
2142
2143 case R_386_TLS_IE_32:
2144 case R_386_TLS_IE:
2145 case R_386_TLS_GOTIE:
2146 if (!bfd_link_executable (info))
2147 info->flags |= DF_STATIC_TLS;
2148 /* Fall through */
2149
2150 case R_386_GOT32:
2151 case R_386_GOT32X:
2152 case R_386_TLS_GD:
2153 case R_386_TLS_GOTDESC:
2154 case R_386_TLS_DESC_CALL:
2155 /* This symbol requires a global offset table entry. */
2156 {
2157 int tls_type, old_tls_type;
2158
2159 switch (r_type)
2160 {
2161 default:
2162 case R_386_GOT32:
2163 case R_386_GOT32X:
2164 tls_type = GOT_NORMAL;
2165 break;
2166 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
2167 case R_386_TLS_GOTDESC:
2168 case R_386_TLS_DESC_CALL:
2169 tls_type = GOT_TLS_GDESC; break;
2170 case R_386_TLS_IE_32:
2171 if (ELF32_R_TYPE (rel->r_info) == r_type)
2172 tls_type = GOT_TLS_IE_NEG;
2173 else
2174 /* If this is a GD->IE transition, we may use either of
2175 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
2176 tls_type = GOT_TLS_IE;
2177 break;
2178 case R_386_TLS_IE:
2179 case R_386_TLS_GOTIE:
2180 tls_type = GOT_TLS_IE_POS; break;
2181 }
2182
2183 if (h != NULL)
2184 {
2185 h->got.refcount += 1;
2186 old_tls_type = elf_i386_hash_entry(h)->tls_type;
2187 }
2188 else
2189 {
2190 bfd_signed_vma *local_got_refcounts;
2191
2192 /* This is a global offset table entry for a local symbol. */
2193 local_got_refcounts = elf_local_got_refcounts (abfd);
2194 if (local_got_refcounts == NULL)
2195 {
2196 bfd_size_type size;
2197
2198 size = symtab_hdr->sh_info;
2199 size *= (sizeof (bfd_signed_vma)
2200 + sizeof (bfd_vma) + sizeof(char));
2201 local_got_refcounts = (bfd_signed_vma *)
2202 bfd_zalloc (abfd, size);
2203 if (local_got_refcounts == NULL)
2204 goto error_return;
2205 elf_local_got_refcounts (abfd) = local_got_refcounts;
2206 elf_i386_local_tlsdesc_gotent (abfd)
2207 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
2208 elf_i386_local_got_tls_type (abfd)
2209 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
2210 }
2211 local_got_refcounts[r_symndx] += 1;
2212 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
2213 }
2214
2215 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
2216 tls_type |= old_tls_type;
2217 /* If a TLS symbol is accessed using IE at least once,
2218 there is no point to use dynamic model for it. */
2219 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
2220 && (! GOT_TLS_GD_ANY_P (old_tls_type)
2221 || (tls_type & GOT_TLS_IE) == 0))
2222 {
2223 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
2224 tls_type = old_tls_type;
2225 else if (GOT_TLS_GD_ANY_P (old_tls_type)
2226 && GOT_TLS_GD_ANY_P (tls_type))
2227 tls_type |= old_tls_type;
2228 else
2229 {
2230 if (h)
2231 name = h->root.root.string;
2232 else
2233 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
2234 NULL);
2235 _bfd_error_handler
2236 /* xgettext:c-format */
2237 (_("%B: `%s' accessed both as normal and "
2238 "thread local symbol"),
2239 abfd, name);
2240 bfd_set_error (bfd_error_bad_value);
2241 goto error_return;
2242 }
2243 }
2244
2245 if (old_tls_type != tls_type)
2246 {
2247 if (h != NULL)
2248 elf_i386_hash_entry (h)->tls_type = tls_type;
2249 else
2250 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
2251 }
2252 }
2253 /* Fall through */
2254
2255 case R_386_GOTOFF:
2256 case R_386_GOTPC:
2257 create_got:
2258 if (r_type != R_386_TLS_IE)
2259 {
2260 if (eh != NULL)
2261 eh->has_got_reloc = 1;
2262 break;
2263 }
2264 /* Fall through */
2265
2266 case R_386_TLS_LE_32:
2267 case R_386_TLS_LE:
2268 if (eh != NULL)
2269 eh->has_got_reloc = 1;
2270 if (bfd_link_executable (info))
2271 break;
2272 info->flags |= DF_STATIC_TLS;
2273 goto do_relocation;
2274
2275 case R_386_32:
2276 case R_386_PC32:
2277 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
2278 eh->has_non_got_reloc = 1;
2279 do_relocation:
2280 /* We are called after all symbols have been resolved. Only
2281 relocation against STT_GNU_IFUNC symbol must go through
2282 PLT. */
2283 if (h != NULL
2284 && (bfd_link_executable (info)
2285 || h->type == STT_GNU_IFUNC))
2286 {
2287 /* If this reloc is in a read-only section, we might
2288 need a copy reloc. We can't check reliably at this
2289 stage whether the section is read-only, as input
2290 sections have not yet been mapped to output sections.
2291 Tentatively set the flag for now, and correct in
2292 adjust_dynamic_symbol. */
2293 h->non_got_ref = 1;
2294
2295 /* We may need a .plt entry if the symbol is a function
2296 defined in a shared lib or is a STT_GNU_IFUNC function
2297 referenced from the code or read-only section. */
2298 if (!h->def_regular
2299 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
2300 h->plt.refcount += 1;
2301
2302 if (r_type == R_386_PC32)
2303 {
2304 /* Since something like ".long foo - ." may be used
2305 as pointer, make sure that PLT is used if foo is
2306 a function defined in a shared library. */
2307 if ((sec->flags & SEC_CODE) == 0)
2308 h->pointer_equality_needed = 1;
2309 else if (h->type == STT_GNU_IFUNC
2310 && bfd_link_pic (info))
2311 {
2312 _bfd_error_handler
2313 /* xgettext:c-format */
2314 (_("%B: unsupported non-PIC call to IFUNC `%s'"),
2315 abfd, h->root.root.string);
2316 bfd_set_error (bfd_error_bad_value);
2317 goto error_return;
2318 }
2319 }
2320 else
2321 {
2322 h->pointer_equality_needed = 1;
2323 /* R_386_32 can be resolved at run-time. */
2324 if (r_type == R_386_32
2325 && (sec->flags & SEC_READONLY) == 0)
2326 eh->func_pointer_refcount += 1;
2327 }
2328 }
2329
2330 size_reloc = FALSE;
2331 do_size:
2332 /* If we are creating a shared library, and this is a reloc
2333 against a global symbol, or a non PC relative reloc
2334 against a local symbol, then we need to copy the reloc
2335 into the shared library. However, if we are linking with
2336 -Bsymbolic, we do not need to copy a reloc against a
2337 global symbol which is defined in an object we are
2338 including in the link (i.e., DEF_REGULAR is set). At
2339 this point we have not seen all the input files, so it is
2340 possible that DEF_REGULAR is not set now but will be set
2341 later (it is never cleared). In case of a weak definition,
2342 DEF_REGULAR may be cleared later by a strong definition in
2343 a shared library. We account for that possibility below by
2344 storing information in the relocs_copied field of the hash
2345 table entry. A similar situation occurs when creating
2346 shared libraries and symbol visibility changes render the
2347 symbol local.
2348
2349 If on the other hand, we are creating an executable, we
2350 may need to keep relocations for symbols satisfied by a
2351 dynamic library if we manage to avoid copy relocs for the
2352 symbol.
2353
2354 Generate dynamic pointer relocation against STT_GNU_IFUNC
2355 symbol in the non-code section. */
2356 if ((bfd_link_pic (info)
2357 && (r_type != R_386_PC32
2358 || (h != NULL
2359 && (! (bfd_link_pie (info)
2360 || SYMBOLIC_BIND (info, h))
2361 || h->root.type == bfd_link_hash_defweak
2362 || !h->def_regular))))
2363 || (h != NULL
2364 && h->type == STT_GNU_IFUNC
2365 && r_type == R_386_32
2366 && (sec->flags & SEC_CODE) == 0)
2367 || (ELIMINATE_COPY_RELOCS
2368 && !bfd_link_pic (info)
2369 && h != NULL
2370 && (h->root.type == bfd_link_hash_defweak
2371 || !h->def_regular)))
2372 {
2373 struct elf_dyn_relocs *p;
2374 struct elf_dyn_relocs **head;
2375
2376 /* We must copy these reloc types into the output file.
2377 Create a reloc section in dynobj and make room for
2378 this reloc. */
2379 if (sreloc == NULL)
2380 {
2381 sreloc = _bfd_elf_make_dynamic_reloc_section
2382 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
2383
2384 if (sreloc == NULL)
2385 goto error_return;
2386 }
2387
2388 /* If this is a global symbol, we count the number of
2389 relocations we need for this symbol. */
2390 if (h != NULL)
2391 {
2392 head = &eh->dyn_relocs;
2393 }
2394 else
2395 {
2396 /* Track dynamic relocs needed for local syms too.
2397 We really need local syms available to do this
2398 easily. Oh well. */
2399 void **vpp;
2400 asection *s;
2401
2402 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2403 abfd, r_symndx);
2404 if (isym == NULL)
2405 goto error_return;
2406
2407 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
2408 if (s == NULL)
2409 s = sec;
2410
2411 vpp = &elf_section_data (s)->local_dynrel;
2412 head = (struct elf_dyn_relocs **)vpp;
2413 }
2414
2415 p = *head;
2416 if (p == NULL || p->sec != sec)
2417 {
2418 bfd_size_type amt = sizeof *p;
2419 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
2420 amt);
2421 if (p == NULL)
2422 goto error_return;
2423 p->next = *head;
2424 *head = p;
2425 p->sec = sec;
2426 p->count = 0;
2427 p->pc_count = 0;
2428 }
2429
2430 p->count += 1;
2431 /* Count size relocation as PC-relative relocation. */
2432 if (r_type == R_386_PC32 || size_reloc)
2433 p->pc_count += 1;
2434 }
2435 break;
2436
2437 /* This relocation describes the C++ object vtable hierarchy.
2438 Reconstruct it for later use during GC. */
2439 case R_386_GNU_VTINHERIT:
2440 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
2441 goto error_return;
2442 break;
2443
2444 /* This relocation describes which C++ vtable entries are actually
2445 used. Record for later use during GC. */
2446 case R_386_GNU_VTENTRY:
2447 BFD_ASSERT (h != NULL);
2448 if (h != NULL
2449 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
2450 goto error_return;
2451 break;
2452
2453 default:
2454 break;
2455 }
2456
2457 if (r_type == R_386_GOT32X
2458 && (h == NULL || h->type != STT_GNU_IFUNC))
2459 sec->need_convert_load = 1;
2460 }
2461
2462 if (elf_section_data (sec)->this_hdr.contents != contents)
2463 {
2464 if (!info->keep_memory)
2465 free (contents);
2466 else
2467 {
2468 /* Cache the section contents for elf_link_input_bfd. */
2469 elf_section_data (sec)->this_hdr.contents = contents;
2470 }
2471 }
2472
2473 return TRUE;
2474
2475 error_return:
2476 if (elf_section_data (sec)->this_hdr.contents != contents)
2477 free (contents);
2478 sec->check_relocs_failed = 1;
2479 return FALSE;
2480 }
2481
2482 /* Return the section that should be marked against GC for a given
2483 relocation. */
2484
2485 static asection *
2486 elf_i386_gc_mark_hook (asection *sec,
2487 struct bfd_link_info *info,
2488 Elf_Internal_Rela *rel,
2489 struct elf_link_hash_entry *h,
2490 Elf_Internal_Sym *sym)
2491 {
2492 if (h != NULL)
2493 switch (ELF32_R_TYPE (rel->r_info))
2494 {
2495 case R_386_GNU_VTINHERIT:
2496 case R_386_GNU_VTENTRY:
2497 return NULL;
2498 }
2499
2500 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
2501 }
2502
2503 /* Remove undefined weak symbol from the dynamic symbol table if it
2504 is resolved to 0. */
2505
2506 static bfd_boolean
2507 elf_i386_fixup_symbol (struct bfd_link_info *info,
2508 struct elf_link_hash_entry *h)
2509 {
2510 if (h->dynindx != -1
2511 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2512 elf_i386_hash_entry (h)->has_got_reloc,
2513 elf_i386_hash_entry (h)))
2514 {
2515 h->dynindx = -1;
2516 _bfd_elf_strtab_delref (elf_hash_table (info)->dynstr,
2517 h->dynstr_index);
2518 }
2519 return TRUE;
2520 }
2521
2522 /* Adjust a symbol defined by a dynamic object and referenced by a
2523 regular object. The current definition is in some section of the
2524 dynamic object, but we're not including those sections. We have to
2525 change the definition to something the rest of the link can
2526 understand. */
2527
2528 static bfd_boolean
2529 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2530 struct elf_link_hash_entry *h)
2531 {
2532 struct elf_i386_link_hash_table *htab;
2533 asection *s, *srel;
2534 struct elf_i386_link_hash_entry *eh;
2535 struct elf_dyn_relocs *p;
2536
2537 /* STT_GNU_IFUNC symbol must go through PLT. */
2538 if (h->type == STT_GNU_IFUNC)
2539 {
2540 /* All local STT_GNU_IFUNC references must be treate as local
2541 calls via local PLT. */
2542 if (h->ref_regular
2543 && SYMBOL_CALLS_LOCAL (info, h))
2544 {
2545 bfd_size_type pc_count = 0, count = 0;
2546 struct elf_dyn_relocs **pp;
2547
2548 eh = (struct elf_i386_link_hash_entry *) h;
2549 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2550 {
2551 pc_count += p->pc_count;
2552 p->count -= p->pc_count;
2553 p->pc_count = 0;
2554 count += p->count;
2555 if (p->count == 0)
2556 *pp = p->next;
2557 else
2558 pp = &p->next;
2559 }
2560
2561 if (pc_count || count)
2562 {
2563 h->non_got_ref = 1;
2564 if (pc_count)
2565 {
2566 /* Increment PLT reference count only for PC-relative
2567 references. */
2568 h->needs_plt = 1;
2569 if (h->plt.refcount <= 0)
2570 h->plt.refcount = 1;
2571 else
2572 h->plt.refcount += 1;
2573 }
2574 }
2575 }
2576
2577 if (h->plt.refcount <= 0)
2578 {
2579 h->plt.offset = (bfd_vma) -1;
2580 h->needs_plt = 0;
2581 }
2582 return TRUE;
2583 }
2584
2585 /* If this is a function, put it in the procedure linkage table. We
2586 will fill in the contents of the procedure linkage table later,
2587 when we know the address of the .got section. */
2588 if (h->type == STT_FUNC
2589 || h->needs_plt)
2590 {
2591 if (h->plt.refcount <= 0
2592 || SYMBOL_CALLS_LOCAL (info, h)
2593 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2594 && h->root.type == bfd_link_hash_undefweak))
2595 {
2596 /* This case can occur if we saw a PLT32 reloc in an input
2597 file, but the symbol was never referred to by a dynamic
2598 object, or if all references were garbage collected. In
2599 such a case, we don't actually need to build a procedure
2600 linkage table, and we can just do a PC32 reloc instead. */
2601 h->plt.offset = (bfd_vma) -1;
2602 h->needs_plt = 0;
2603 }
2604
2605 return TRUE;
2606 }
2607 else
2608 /* It's possible that we incorrectly decided a .plt reloc was
2609 needed for an R_386_PC32 reloc to a non-function sym in
2610 check_relocs. We can't decide accurately between function and
2611 non-function syms in check-relocs; Objects loaded later in
2612 the link may change h->type. So fix it now. */
2613 h->plt.offset = (bfd_vma) -1;
2614
2615 /* If this is a weak symbol, and there is a real definition, the
2616 processor independent code will have arranged for us to see the
2617 real definition first, and we can just use the same value. */
2618 if (h->u.weakdef != NULL)
2619 {
2620 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2621 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2622 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2623 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2624 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2625 h->non_got_ref = h->u.weakdef->non_got_ref;
2626 return TRUE;
2627 }
2628
2629 /* This is a reference to a symbol defined by a dynamic object which
2630 is not a function. */
2631
2632 /* If we are creating a shared library, we must presume that the
2633 only references to the symbol are via the global offset table.
2634 For such cases we need not do anything here; the relocations will
2635 be handled correctly by relocate_section. */
2636 if (!bfd_link_executable (info))
2637 return TRUE;
2638
2639 /* If there are no references to this symbol that do not use the
2640 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2641 reloc. */
2642 eh = (struct elf_i386_link_hash_entry *) h;
2643 if (!h->non_got_ref && !eh->gotoff_ref)
2644 return TRUE;
2645
2646 /* If -z nocopyreloc was given, we won't generate them either. */
2647 if (info->nocopyreloc)
2648 {
2649 h->non_got_ref = 0;
2650 return TRUE;
2651 }
2652
2653 htab = elf_i386_hash_table (info);
2654 if (htab == NULL)
2655 return FALSE;
2656
2657 /* If there aren't any dynamic relocs in read-only sections nor
2658 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2659 avoid the copy reloc. This doesn't work on VxWorks, where we can
2660 not have dynamic relocations (other than copy and jump slot
2661 relocations) in an executable. */
2662 if (ELIMINATE_COPY_RELOCS
2663 && !eh->gotoff_ref
2664 && get_elf_i386_backend_data (info->output_bfd)->os != is_vxworks)
2665 {
2666 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2667 {
2668 s = p->sec->output_section;
2669 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2670 break;
2671 }
2672
2673 if (p == NULL)
2674 {
2675 h->non_got_ref = 0;
2676 return TRUE;
2677 }
2678 }
2679
2680 /* We must allocate the symbol in our .dynbss section, which will
2681 become part of the .bss section of the executable. There will be
2682 an entry for this symbol in the .dynsym section. The dynamic
2683 object will contain position independent code, so all references
2684 from the dynamic object to this symbol will go through the global
2685 offset table. The dynamic linker will use the .dynsym entry to
2686 determine the address it must put in the global offset table, so
2687 both the dynamic object and the regular object will refer to the
2688 same memory location for the variable. */
2689
2690 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2691 copy the initial value out of the dynamic object and into the
2692 runtime process image. */
2693 if ((h->root.u.def.section->flags & SEC_READONLY) != 0)
2694 {
2695 s = htab->elf.sdynrelro;
2696 srel = htab->elf.sreldynrelro;
2697 }
2698 else
2699 {
2700 s = htab->elf.sdynbss;
2701 srel = htab->elf.srelbss;
2702 }
2703 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2704 {
2705 srel->size += sizeof (Elf32_External_Rel);
2706 h->needs_copy = 1;
2707 }
2708
2709 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2710 }
2711
2712 /* Allocate space in .plt, .got and associated reloc sections for
2713 dynamic relocs. */
2714
2715 static bfd_boolean
2716 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2717 {
2718 struct bfd_link_info *info;
2719 struct elf_i386_link_hash_table *htab;
2720 struct elf_i386_link_hash_entry *eh;
2721 struct elf_dyn_relocs *p;
2722 unsigned plt_entry_size;
2723 bfd_boolean resolved_to_zero;
2724 const struct elf_i386_backend_data *bed;
2725
2726 if (h->root.type == bfd_link_hash_indirect)
2727 return TRUE;
2728
2729 eh = (struct elf_i386_link_hash_entry *) h;
2730
2731 info = (struct bfd_link_info *) inf;
2732 htab = elf_i386_hash_table (info);
2733 if (htab == NULL)
2734 return FALSE;
2735
2736 bed = get_elf_i386_backend_data (info->output_bfd);
2737
2738 plt_entry_size = htab->plt.plt_entry_size;
2739
2740 resolved_to_zero = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
2741 eh->has_got_reloc,
2742 eh);
2743
2744 /* Clear the reference count of function pointer relocations if
2745 symbol isn't a normal function. */
2746 if (h->type != STT_FUNC)
2747 eh->func_pointer_refcount = 0;
2748
2749 /* We can't use the GOT PLT if pointer equality is needed since
2750 finish_dynamic_symbol won't clear symbol value and the dynamic
2751 linker won't update the GOT slot. We will get into an infinite
2752 loop at run-time. */
2753 if (htab->plt_got != NULL
2754 && h->type != STT_GNU_IFUNC
2755 && !h->pointer_equality_needed
2756 && h->plt.refcount > 0
2757 && h->got.refcount > 0)
2758 {
2759 /* Don't use the regular PLT if there are both GOT and GOTPLT
2760 reloctions. */
2761 h->plt.offset = (bfd_vma) -1;
2762
2763 /* Use the GOT PLT. */
2764 eh->plt_got.refcount = 1;
2765 }
2766
2767 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2768 here if it is defined and referenced in a non-shared object. */
2769 if (h->type == STT_GNU_IFUNC
2770 && h->def_regular)
2771 {
2772 if (_bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2773 &htab->readonly_dynrelocs_against_ifunc,
2774 plt_entry_size,
2775 (htab->plt.has_plt0 *
2776 plt_entry_size),
2777 4, TRUE))
2778 {
2779 asection *s = htab->plt_second;
2780 if (h->plt.offset != (bfd_vma) -1 && s != NULL)
2781 {
2782 /* Use the second PLT section if it is created. */
2783 eh->plt_second.offset = s->size;
2784
2785 /* Make room for this entry in the second PLT section. */
2786 s->size += htab->non_lazy_plt->plt_entry_size;
2787 }
2788
2789 return TRUE;
2790 }
2791 else
2792 return FALSE;
2793 }
2794 /* Don't create the PLT entry if there are only function pointer
2795 relocations which can be resolved at run-time. */
2796 else if (htab->elf.dynamic_sections_created
2797 && (h->plt.refcount > eh->func_pointer_refcount
2798 || eh->plt_got.refcount > 0))
2799 {
2800 bfd_boolean use_plt_got = eh->plt_got.refcount > 0;
2801
2802 /* Clear the reference count of function pointer relocations
2803 if PLT is used. */
2804 eh->func_pointer_refcount = 0;
2805
2806 /* Make sure this symbol is output as a dynamic symbol.
2807 Undefined weak syms won't yet be marked as dynamic. */
2808 if (h->dynindx == -1
2809 && !h->forced_local
2810 && !resolved_to_zero
2811 && h->root.type == bfd_link_hash_undefweak)
2812 {
2813 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2814 return FALSE;
2815 }
2816
2817 if (bfd_link_pic (info)
2818 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2819 {
2820 asection *s = htab->elf.splt;
2821 asection *second_s = htab->plt_second;
2822 asection *got_s = htab->plt_got;
2823
2824 /* If this is the first .plt entry, make room for the special
2825 first entry. The .plt section is used by prelink to undo
2826 prelinking for dynamic relocations. */
2827 if (s->size == 0)
2828 s->size = htab->plt.has_plt0 * plt_entry_size;
2829
2830 if (use_plt_got)
2831 eh->plt_got.offset = got_s->size;
2832 else
2833 {
2834 h->plt.offset = s->size;
2835 if (second_s)
2836 eh->plt_second.offset = second_s->size;
2837 }
2838
2839 /* If this symbol is not defined in a regular file, and we are
2840 not generating a shared library, then set the symbol to this
2841 location in the .plt. This is required to make function
2842 pointers compare as equal between the normal executable and
2843 the shared library. */
2844 if (! bfd_link_pic (info)
2845 && !h->def_regular)
2846 {
2847 if (use_plt_got)
2848 {
2849 /* We need to make a call to the entry of the GOT PLT
2850 instead of regular PLT entry. */
2851 h->root.u.def.section = got_s;
2852 h->root.u.def.value = eh->plt_got.offset;
2853 }
2854 else
2855 {
2856 if (second_s)
2857 {
2858 /* We need to make a call to the entry of the
2859 second PLT instead of regular PLT entry. */
2860 h->root.u.def.section = second_s;
2861 h->root.u.def.value = eh->plt_second.offset;
2862 }
2863 else
2864 {
2865 h->root.u.def.section = s;
2866 h->root.u.def.value = h->plt.offset;
2867 }
2868 }
2869 }
2870
2871 /* Make room for this entry. */
2872 if (use_plt_got)
2873 got_s->size += htab->non_lazy_plt->plt_entry_size;
2874 else
2875 {
2876 s->size += plt_entry_size;
2877 if (second_s)
2878 second_s->size += htab->non_lazy_plt->plt_entry_size;
2879
2880 /* We also need to make an entry in the .got.plt section,
2881 which will be placed in the .got section by the linker
2882 script. */
2883 htab->elf.sgotplt->size += 4;
2884
2885 /* There should be no PLT relocation against resolved
2886 undefined weak symbol in executable. */
2887 if (!resolved_to_zero)
2888 {
2889 /* We also need to make an entry in the .rel.plt
2890 section. */
2891 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2892 htab->elf.srelplt->reloc_count++;
2893 }
2894 }
2895
2896 if (bed->os == is_vxworks && !bfd_link_pic (info))
2897 {
2898 /* VxWorks has a second set of relocations for each PLT entry
2899 in executables. They go in a separate relocation section,
2900 which is processed by the kernel loader. */
2901
2902 /* There are two relocations for the initial PLT entry: an
2903 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2904 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2905
2906 if (h->plt.offset == plt_entry_size)
2907 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2908
2909 /* There are two extra relocations for each subsequent PLT entry:
2910 an R_386_32 relocation for the GOT entry, and an R_386_32
2911 relocation for the PLT entry. */
2912
2913 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2914 }
2915 }
2916 else
2917 {
2918 eh->plt_got.offset = (bfd_vma) -1;
2919 h->plt.offset = (bfd_vma) -1;
2920 h->needs_plt = 0;
2921 }
2922 }
2923 else
2924 {
2925 eh->plt_got.offset = (bfd_vma) -1;
2926 h->plt.offset = (bfd_vma) -1;
2927 h->needs_plt = 0;
2928 }
2929
2930 eh->tlsdesc_got = (bfd_vma) -1;
2931
2932 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2933 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2934 if (h->got.refcount > 0
2935 && bfd_link_executable (info)
2936 && h->dynindx == -1
2937 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2938 h->got.offset = (bfd_vma) -1;
2939 else if (h->got.refcount > 0)
2940 {
2941 asection *s;
2942 bfd_boolean dyn;
2943 int tls_type = elf_i386_hash_entry(h)->tls_type;
2944
2945 /* Make sure this symbol is output as a dynamic symbol.
2946 Undefined weak syms won't yet be marked as dynamic. */
2947 if (h->dynindx == -1
2948 && !h->forced_local
2949 && !resolved_to_zero
2950 && h->root.type == bfd_link_hash_undefweak)
2951 {
2952 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2953 return FALSE;
2954 }
2955
2956 s = htab->elf.sgot;
2957 if (GOT_TLS_GDESC_P (tls_type))
2958 {
2959 eh->tlsdesc_got = htab->elf.sgotplt->size
2960 - elf_i386_compute_jump_table_size (htab);
2961 htab->elf.sgotplt->size += 8;
2962 h->got.offset = (bfd_vma) -2;
2963 }
2964 if (! GOT_TLS_GDESC_P (tls_type)
2965 || GOT_TLS_GD_P (tls_type))
2966 {
2967 h->got.offset = s->size;
2968 s->size += 4;
2969 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2970 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2971 s->size += 4;
2972 }
2973 dyn = htab->elf.dynamic_sections_created;
2974 /* R_386_TLS_IE_32 needs one dynamic relocation,
2975 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2976 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2977 need two), R_386_TLS_GD needs one if local symbol and two if
2978 global. No dynamic relocation against resolved undefined weak
2979 symbol in executable. */
2980 if (tls_type == GOT_TLS_IE_BOTH)
2981 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2982 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2983 || (tls_type & GOT_TLS_IE))
2984 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2985 else if (GOT_TLS_GD_P (tls_type))
2986 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2987 else if (! GOT_TLS_GDESC_P (tls_type)
2988 && ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2989 && !resolved_to_zero)
2990 || h->root.type != bfd_link_hash_undefweak)
2991 && (bfd_link_pic (info)
2992 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2993 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2994 if (GOT_TLS_GDESC_P (tls_type))
2995 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2996 }
2997 else
2998 h->got.offset = (bfd_vma) -1;
2999
3000 if (eh->dyn_relocs == NULL)
3001 return TRUE;
3002
3003 /* In the shared -Bsymbolic case, discard space allocated for
3004 dynamic pc-relative relocs against symbols which turn out to be
3005 defined in regular objects. For the normal shared case, discard
3006 space for pc-relative relocs that have become local due to symbol
3007 visibility changes. */
3008
3009 if (bfd_link_pic (info))
3010 {
3011 /* The only reloc that uses pc_count is R_386_PC32, which will
3012 appear on a call or on something like ".long foo - .". We
3013 want calls to protected symbols to resolve directly to the
3014 function rather than going via the plt. If people want
3015 function pointer comparisons to work as expected then they
3016 should avoid writing assembly like ".long foo - .". */
3017 if (SYMBOL_CALLS_LOCAL (info, h))
3018 {
3019 struct elf_dyn_relocs **pp;
3020
3021 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3022 {
3023 p->count -= p->pc_count;
3024 p->pc_count = 0;
3025 if (p->count == 0)
3026 *pp = p->next;
3027 else
3028 pp = &p->next;
3029 }
3030 }
3031
3032 if (bed->os == is_vxworks)
3033 {
3034 struct elf_dyn_relocs **pp;
3035 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3036 {
3037 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
3038 *pp = p->next;
3039 else
3040 pp = &p->next;
3041 }
3042 }
3043
3044 /* Also discard relocs on undefined weak syms with non-default
3045 visibility or in PIE. */
3046 if (eh->dyn_relocs != NULL
3047 && h->root.type == bfd_link_hash_undefweak)
3048 {
3049 /* Undefined weak symbol is never bound locally in shared
3050 library. */
3051 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
3052 || resolved_to_zero)
3053 {
3054 if (h->non_got_ref)
3055 {
3056 /* Keep dynamic non-GOT/non-PLT relocation so that we
3057 can branch to 0 without PLT. */
3058 struct elf_dyn_relocs **pp;
3059
3060 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
3061 if (p->pc_count == 0)
3062 *pp = p->next;
3063 else
3064 {
3065 /* Remove non-R_386_PC32 relocation. */
3066 p->count = p->pc_count;
3067 pp = &p->next;
3068 }
3069
3070 if (eh->dyn_relocs != NULL)
3071 {
3072 /* Make sure undefined weak symbols are output
3073 as dynamic symbols in PIEs for dynamic non-GOT
3074 non-PLT reloations. */
3075 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3076 return FALSE;
3077 }
3078 }
3079 else
3080 eh->dyn_relocs = NULL;
3081 }
3082 else if (h->dynindx == -1
3083 && !h->forced_local)
3084 {
3085 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3086 return FALSE;
3087 }
3088 }
3089 }
3090 else if (ELIMINATE_COPY_RELOCS)
3091 {
3092 /* For the non-shared case, discard space for relocs against
3093 symbols which turn out to need copy relocs or are not
3094 dynamic. Keep dynamic relocations for run-time function
3095 pointer initialization. */
3096
3097 if ((!h->non_got_ref
3098 || eh->func_pointer_refcount > 0
3099 || (h->root.type == bfd_link_hash_undefweak
3100 && !resolved_to_zero))
3101 && ((h->def_dynamic
3102 && !h->def_regular)
3103 || (htab->elf.dynamic_sections_created
3104 && (h->root.type == bfd_link_hash_undefweak
3105 || h->root.type == bfd_link_hash_undefined))))
3106 {
3107 /* Make sure this symbol is output as a dynamic symbol.
3108 Undefined weak syms won't yet be marked as dynamic. */
3109 if (h->dynindx == -1
3110 && !h->forced_local
3111 && !resolved_to_zero
3112 && h->root.type == bfd_link_hash_undefweak)
3113 {
3114 if (! bfd_elf_link_record_dynamic_symbol (info, h))
3115 return FALSE;
3116 }
3117
3118 /* If that succeeded, we know we'll be keeping all the
3119 relocs. */
3120 if (h->dynindx != -1)
3121 goto keep;
3122 }
3123
3124 eh->dyn_relocs = NULL;
3125 eh->func_pointer_refcount = 0;
3126
3127 keep: ;
3128 }
3129
3130 /* Finally, allocate space. */
3131 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3132 {
3133 asection *sreloc;
3134
3135 sreloc = elf_section_data (p->sec)->sreloc;
3136
3137 BFD_ASSERT (sreloc != NULL);
3138 sreloc->size += p->count * sizeof (Elf32_External_Rel);
3139 }
3140
3141 return TRUE;
3142 }
3143
3144 /* Allocate space in .plt, .got and associated reloc sections for
3145 local dynamic relocs. */
3146
3147 static bfd_boolean
3148 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
3149 {
3150 struct elf_link_hash_entry *h
3151 = (struct elf_link_hash_entry *) *slot;
3152
3153 if (h->type != STT_GNU_IFUNC
3154 || !h->def_regular
3155 || !h->ref_regular
3156 || !h->forced_local
3157 || h->root.type != bfd_link_hash_defined)
3158 abort ();
3159
3160 return elf_i386_allocate_dynrelocs (h, inf);
3161 }
3162
3163 /* Find any dynamic relocs that apply to read-only sections. */
3164
3165 static bfd_boolean
3166 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
3167 {
3168 struct elf_i386_link_hash_entry *eh;
3169 struct elf_dyn_relocs *p;
3170
3171 /* Skip local IFUNC symbols. */
3172 if (h->forced_local && h->type == STT_GNU_IFUNC)
3173 return TRUE;
3174
3175 eh = (struct elf_i386_link_hash_entry *) h;
3176 for (p = eh->dyn_relocs; p != NULL; p = p->next)
3177 {
3178 asection *s = p->sec->output_section;
3179
3180 if (s != NULL && (s->flags & SEC_READONLY) != 0)
3181 {
3182 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3183
3184 info->flags |= DF_TEXTREL;
3185
3186 if ((info->warn_shared_textrel && bfd_link_pic (info))
3187 || info->error_textrel)
3188 /* xgettext:c-format */
3189 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
3190 p->sec->owner, h->root.root.string,
3191 p->sec);
3192
3193 /* Not an error, just cut short the traversal. */
3194 return FALSE;
3195 }
3196 }
3197 return TRUE;
3198 }
3199
3200 /* Convert load via the GOT slot to load immediate. */
3201
3202 static bfd_boolean
3203 elf_i386_convert_load (bfd *abfd, asection *sec,
3204 struct bfd_link_info *link_info)
3205 {
3206 struct elf_i386_link_hash_table *htab;
3207 Elf_Internal_Shdr *symtab_hdr;
3208 Elf_Internal_Rela *internal_relocs;
3209 Elf_Internal_Rela *irel, *irelend;
3210 bfd_byte *contents;
3211 bfd_boolean changed;
3212 bfd_signed_vma *local_got_refcounts;
3213
3214 /* Don't even try to convert non-ELF outputs. */
3215 if (!is_elf_hash_table (link_info->hash))
3216 return FALSE;
3217
3218 /* Nothing to do if there is no need or no output. */
3219 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
3220 || sec->need_convert_load == 0
3221 || bfd_is_abs_section (sec->output_section))
3222 return TRUE;
3223
3224 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
3225
3226 /* Load the relocations for this section. */
3227 internal_relocs = (_bfd_elf_link_read_relocs
3228 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
3229 link_info->keep_memory));
3230 if (internal_relocs == NULL)
3231 return FALSE;
3232
3233 changed = FALSE;
3234 htab = elf_i386_hash_table (link_info);
3235 local_got_refcounts = elf_local_got_refcounts (abfd);
3236
3237 /* Get the section contents. */
3238 if (elf_section_data (sec)->this_hdr.contents != NULL)
3239 contents = elf_section_data (sec)->this_hdr.contents;
3240 else
3241 {
3242 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
3243 goto error_return;
3244 }
3245
3246 irelend = internal_relocs + sec->reloc_count;
3247 for (irel = internal_relocs; irel < irelend; irel++)
3248 {
3249 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
3250 unsigned int r_symndx;
3251 struct elf_link_hash_entry *h;
3252 bfd_boolean converted;
3253
3254 /* Don't convert R_386_GOT32 since we can't tell if it is applied
3255 to "mov $foo@GOT, %reg" which isn't a load via GOT. */
3256 if (r_type != R_386_GOT32X)
3257 continue;
3258
3259 r_symndx = ELF32_R_SYM (irel->r_info);
3260 if (r_symndx < symtab_hdr->sh_info)
3261 h = elf_i386_get_local_sym_hash (htab, sec->owner,
3262 (const Elf_Internal_Rela *) irel,
3263 FALSE);
3264 else
3265 {
3266 h = elf_sym_hashes (abfd)[r_symndx - symtab_hdr->sh_info];
3267 while (h->root.type == bfd_link_hash_indirect
3268 || h->root.type == bfd_link_hash_warning)
3269 h = (struct elf_link_hash_entry *) h->root.u.i.link;
3270 }
3271
3272 /* STT_GNU_IFUNC must keep GOT32 relocations. */
3273 if (h != NULL && h->type == STT_GNU_IFUNC)
3274 continue;
3275
3276 converted = FALSE;
3277 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
3278 irel, h, &converted, link_info))
3279 goto error_return;
3280
3281 if (converted)
3282 {
3283 changed = converted;
3284 if (h)
3285 {
3286 if (h->got.refcount > 0)
3287 h->got.refcount -= 1;
3288 }
3289 else
3290 {
3291 if (local_got_refcounts != NULL
3292 && local_got_refcounts[r_symndx] > 0)
3293 local_got_refcounts[r_symndx] -= 1;
3294 }
3295 }
3296 }
3297
3298 if (contents != NULL
3299 && elf_section_data (sec)->this_hdr.contents != contents)
3300 {
3301 if (!changed && !link_info->keep_memory)
3302 free (contents);
3303 else
3304 {
3305 /* Cache the section contents for elf_link_input_bfd. */
3306 elf_section_data (sec)->this_hdr.contents = contents;
3307 }
3308 }
3309
3310 if (elf_section_data (sec)->relocs != internal_relocs)
3311 {
3312 if (!changed)
3313 free (internal_relocs);
3314 else
3315 elf_section_data (sec)->relocs = internal_relocs;
3316 }
3317
3318 return TRUE;
3319
3320 error_return:
3321 if (contents != NULL
3322 && elf_section_data (sec)->this_hdr.contents != contents)
3323 free (contents);
3324 if (internal_relocs != NULL
3325 && elf_section_data (sec)->relocs != internal_relocs)
3326 free (internal_relocs);
3327 return FALSE;
3328 }
3329
3330 /* Set the sizes of the dynamic sections. */
3331
3332 static bfd_boolean
3333 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3334 {
3335 struct elf_i386_link_hash_table *htab;
3336 bfd *dynobj;
3337 asection *s;
3338 bfd_boolean relocs;
3339 bfd *ibfd;
3340
3341 htab = elf_i386_hash_table (info);
3342 if (htab == NULL)
3343 return FALSE;
3344 dynobj = htab->elf.dynobj;
3345 if (dynobj == NULL)
3346 abort ();
3347
3348 /* Set up .got offsets for local syms, and space for local dynamic
3349 relocs. */
3350 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3351 {
3352 bfd_signed_vma *local_got;
3353 bfd_signed_vma *end_local_got;
3354 char *local_tls_type;
3355 bfd_vma *local_tlsdesc_gotent;
3356 bfd_size_type locsymcount;
3357 Elf_Internal_Shdr *symtab_hdr;
3358 asection *srel;
3359
3360 if (! is_i386_elf (ibfd))
3361 continue;
3362
3363 for (s = ibfd->sections; s != NULL; s = s->next)
3364 {
3365 struct elf_dyn_relocs *p;
3366
3367 if (!elf_i386_convert_load (ibfd, s, info))
3368 return FALSE;
3369
3370 for (p = ((struct elf_dyn_relocs *)
3371 elf_section_data (s)->local_dynrel);
3372 p != NULL;
3373 p = p->next)
3374 {
3375 if (!bfd_is_abs_section (p->sec)
3376 && bfd_is_abs_section (p->sec->output_section))
3377 {
3378 /* Input section has been discarded, either because
3379 it is a copy of a linkonce section or due to
3380 linker script /DISCARD/, so we'll be discarding
3381 the relocs too. */
3382 }
3383 else if ((get_elf_i386_backend_data (output_bfd)->os
3384 == is_vxworks)
3385 && strcmp (p->sec->output_section->name,
3386 ".tls_vars") == 0)
3387 {
3388 /* Relocations in vxworks .tls_vars sections are
3389 handled specially by the loader. */
3390 }
3391 else if (p->count != 0)
3392 {
3393 srel = elf_section_data (p->sec)->sreloc;
3394 srel->size += p->count * sizeof (Elf32_External_Rel);
3395 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3396 && (info->flags & DF_TEXTREL) == 0)
3397 {
3398 info->flags |= DF_TEXTREL;
3399 if ((info->warn_shared_textrel && bfd_link_pic (info))
3400 || info->error_textrel)
3401 /* xgettext:c-format */
3402 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3403 p->sec->owner, p->sec);
3404 }
3405 }
3406 }
3407 }
3408
3409 local_got = elf_local_got_refcounts (ibfd);
3410 if (!local_got)
3411 continue;
3412
3413 symtab_hdr = &elf_symtab_hdr (ibfd);
3414 locsymcount = symtab_hdr->sh_info;
3415 end_local_got = local_got + locsymcount;
3416 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3417 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3418 s = htab->elf.sgot;
3419 srel = htab->elf.srelgot;
3420 for (; local_got < end_local_got;
3421 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3422 {
3423 *local_tlsdesc_gotent = (bfd_vma) -1;
3424 if (*local_got > 0)
3425 {
3426 if (GOT_TLS_GDESC_P (*local_tls_type))
3427 {
3428 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3429 - elf_i386_compute_jump_table_size (htab);
3430 htab->elf.sgotplt->size += 8;
3431 *local_got = (bfd_vma) -2;
3432 }
3433 if (! GOT_TLS_GDESC_P (*local_tls_type)
3434 || GOT_TLS_GD_P (*local_tls_type))
3435 {
3436 *local_got = s->size;
3437 s->size += 4;
3438 if (GOT_TLS_GD_P (*local_tls_type)
3439 || *local_tls_type == GOT_TLS_IE_BOTH)
3440 s->size += 4;
3441 }
3442 if (bfd_link_pic (info)
3443 || GOT_TLS_GD_ANY_P (*local_tls_type)
3444 || (*local_tls_type & GOT_TLS_IE))
3445 {
3446 if (*local_tls_type == GOT_TLS_IE_BOTH)
3447 srel->size += 2 * sizeof (Elf32_External_Rel);
3448 else if (GOT_TLS_GD_P (*local_tls_type)
3449 || ! GOT_TLS_GDESC_P (*local_tls_type))
3450 srel->size += sizeof (Elf32_External_Rel);
3451 if (GOT_TLS_GDESC_P (*local_tls_type))
3452 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3453 }
3454 }
3455 else
3456 *local_got = (bfd_vma) -1;
3457 }
3458 }
3459
3460 if (htab->tls_ldm_got.refcount > 0)
3461 {
3462 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3463 relocs. */
3464 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3465 htab->elf.sgot->size += 8;
3466 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3467 }
3468 else
3469 htab->tls_ldm_got.offset = -1;
3470
3471 /* Allocate global sym .plt and .got entries, and space for global
3472 sym dynamic relocs. */
3473 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3474
3475 /* Allocate .plt and .got entries, and space for local symbols. */
3476 htab_traverse (htab->loc_hash_table,
3477 elf_i386_allocate_local_dynrelocs,
3478 info);
3479
3480 /* For every jump slot reserved in the sgotplt, reloc_count is
3481 incremented. However, when we reserve space for TLS descriptors,
3482 it's not incremented, so in order to compute the space reserved
3483 for them, it suffices to multiply the reloc count by the jump
3484 slot size.
3485
3486 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3487 so that R_386_IRELATIVE entries come last. */
3488 if (htab->elf.srelplt)
3489 {
3490 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3491 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3492 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3493 }
3494 else if (htab->elf.irelplt)
3495 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3496
3497
3498 if (htab->elf.sgotplt)
3499 {
3500 /* Don't allocate .got.plt section if there are no GOT nor PLT
3501 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3502 if ((htab->elf.hgot == NULL
3503 || !htab->elf.hgot->ref_regular_nonweak)
3504 && (htab->elf.sgotplt->size
3505 == get_elf_backend_data (output_bfd)->got_header_size)
3506 && (htab->elf.splt == NULL
3507 || htab->elf.splt->size == 0)
3508 && (htab->elf.sgot == NULL
3509 || htab->elf.sgot->size == 0)
3510 && (htab->elf.iplt == NULL
3511 || htab->elf.iplt->size == 0)
3512 && (htab->elf.igotplt == NULL
3513 || htab->elf.igotplt->size == 0))
3514 htab->elf.sgotplt->size = 0;
3515 }
3516
3517 if (_bfd_elf_eh_frame_present (info))
3518 {
3519 if (htab->plt_eh_frame != NULL
3520 && htab->elf.splt != NULL
3521 && htab->elf.splt->size != 0
3522 && !bfd_is_abs_section (htab->elf.splt->output_section))
3523 htab->plt_eh_frame->size = htab->plt.eh_frame_plt_size;
3524
3525 if (htab->plt_got_eh_frame != NULL
3526 && htab->plt_got != NULL
3527 && htab->plt_got->size != 0
3528 && !bfd_is_abs_section (htab->plt_got->output_section))
3529 htab->plt_got_eh_frame->size
3530 = htab->non_lazy_plt->eh_frame_plt_size;
3531
3532 /* Unwind info for the second PLT and .plt.got sections are
3533 identical. */
3534 if (htab->plt_second_eh_frame != NULL
3535 && htab->plt_second != NULL
3536 && htab->plt_second->size != 0
3537 && !bfd_is_abs_section (htab->plt_second->output_section))
3538 htab->plt_second_eh_frame->size
3539 = htab->non_lazy_plt->eh_frame_plt_size;
3540 }
3541
3542 /* We now have determined the sizes of the various dynamic sections.
3543 Allocate memory for them. */
3544 relocs = FALSE;
3545 for (s = dynobj->sections; s != NULL; s = s->next)
3546 {
3547 bfd_boolean strip_section = TRUE;
3548
3549 if ((s->flags & SEC_LINKER_CREATED) == 0)
3550 continue;
3551
3552 if (s == htab->elf.splt
3553 || s == htab->elf.sgot)
3554 {
3555 /* Strip this section if we don't need it; see the
3556 comment below. */
3557 /* We'd like to strip these sections if they aren't needed, but if
3558 we've exported dynamic symbols from them we must leave them.
3559 It's too late to tell BFD to get rid of the symbols. */
3560
3561 if (htab->elf.hplt != NULL)
3562 strip_section = FALSE;
3563 }
3564 else if (s == htab->elf.sgotplt
3565 || s == htab->elf.iplt
3566 || s == htab->elf.igotplt
3567 || s == htab->plt_second
3568 || s == htab->plt_got
3569 || s == htab->plt_eh_frame
3570 || s == htab->plt_got_eh_frame
3571 || s == htab->plt_second_eh_frame
3572 || s == htab->elf.sdynbss
3573 || s == htab->elf.sdynrelro)
3574 {
3575 /* Strip these too. */
3576 }
3577 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3578 {
3579 if (s->size != 0
3580 && s != htab->elf.srelplt
3581 && s != htab->srelplt2)
3582 relocs = TRUE;
3583
3584 /* We use the reloc_count field as a counter if we need
3585 to copy relocs into the output file. */
3586 s->reloc_count = 0;
3587 }
3588 else
3589 {
3590 /* It's not one of our sections, so don't allocate space. */
3591 continue;
3592 }
3593
3594 if (s->size == 0)
3595 {
3596 /* If we don't need this section, strip it from the
3597 output file. This is mostly to handle .rel.bss and
3598 .rel.plt. We must create both sections in
3599 create_dynamic_sections, because they must be created
3600 before the linker maps input sections to output
3601 sections. The linker does that before
3602 adjust_dynamic_symbol is called, and it is that
3603 function which decides whether anything needs to go
3604 into these sections. */
3605 if (strip_section)
3606 s->flags |= SEC_EXCLUDE;
3607 continue;
3608 }
3609
3610 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3611 continue;
3612
3613 /* Allocate memory for the section contents. We use bfd_zalloc
3614 here in case unused entries are not reclaimed before the
3615 section's contents are written out. This should not happen,
3616 but this way if it does, we get a R_386_NONE reloc instead
3617 of garbage. */
3618 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3619 if (s->contents == NULL)
3620 return FALSE;
3621 }
3622
3623 if (htab->plt_eh_frame != NULL
3624 && htab->plt_eh_frame->contents != NULL)
3625 {
3626 memcpy (htab->plt_eh_frame->contents,
3627 htab->plt.eh_frame_plt,
3628 htab->plt_eh_frame->size);
3629 bfd_put_32 (dynobj, htab->elf.splt->size,
3630 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3631 }
3632
3633 if (htab->plt_got_eh_frame != NULL
3634 && htab->plt_got_eh_frame->contents != NULL)
3635 {
3636 memcpy (htab->plt_got_eh_frame->contents,
3637 htab->non_lazy_plt->eh_frame_plt,
3638 htab->plt_got_eh_frame->size);
3639 bfd_put_32 (dynobj, htab->plt_got->size,
3640 (htab->plt_got_eh_frame->contents
3641 + PLT_FDE_LEN_OFFSET));
3642 }
3643
3644 if (htab->plt_second_eh_frame != NULL
3645 && htab->plt_second_eh_frame->contents != NULL)
3646 {
3647 memcpy (htab->plt_second_eh_frame->contents,
3648 htab->non_lazy_plt->eh_frame_plt,
3649 htab->plt_second_eh_frame->size);
3650 bfd_put_32 (dynobj, htab->plt_second->size,
3651 (htab->plt_second_eh_frame->contents
3652 + PLT_FDE_LEN_OFFSET));
3653 }
3654
3655 if (htab->elf.dynamic_sections_created)
3656 {
3657 /* Add some entries to the .dynamic section. We fill in the
3658 values later, in elf_i386_finish_dynamic_sections, but we
3659 must add the entries now so that we get the correct size for
3660 the .dynamic section. The DT_DEBUG entry is filled in by the
3661 dynamic linker and used by the debugger. */
3662 #define add_dynamic_entry(TAG, VAL) \
3663 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3664
3665 if (bfd_link_executable (info))
3666 {
3667 if (!add_dynamic_entry (DT_DEBUG, 0))
3668 return FALSE;
3669 }
3670
3671 if (htab->elf.splt->size != 0)
3672 {
3673 /* DT_PLTGOT is used by prelink even if there is no PLT
3674 relocation. */
3675 if (!add_dynamic_entry (DT_PLTGOT, 0))
3676 return FALSE;
3677 }
3678
3679 if (htab->elf.srelplt->size != 0)
3680 {
3681 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3682 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3683 || !add_dynamic_entry (DT_JMPREL, 0))
3684 return FALSE;
3685 }
3686
3687 if (relocs)
3688 {
3689 if (!add_dynamic_entry (DT_REL, 0)
3690 || !add_dynamic_entry (DT_RELSZ, 0)
3691 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3692 return FALSE;
3693
3694 /* If any dynamic relocs apply to a read-only section,
3695 then we need a DT_TEXTREL entry. */
3696 if ((info->flags & DF_TEXTREL) == 0)
3697 elf_link_hash_traverse (&htab->elf,
3698 elf_i386_readonly_dynrelocs, info);
3699
3700 if ((info->flags & DF_TEXTREL) != 0)
3701 {
3702 if (htab->readonly_dynrelocs_against_ifunc)
3703 {
3704 info->callbacks->einfo
3705 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3706 bfd_set_error (bfd_error_bad_value);
3707 return FALSE;
3708 }
3709
3710 if (!add_dynamic_entry (DT_TEXTREL, 0))
3711 return FALSE;
3712 }
3713 }
3714 if (get_elf_i386_backend_data (output_bfd)->os == is_vxworks
3715 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3716 return FALSE;
3717 }
3718 #undef add_dynamic_entry
3719
3720 return TRUE;
3721 }
3722
3723 static bfd_boolean
3724 elf_i386_always_size_sections (bfd *output_bfd,
3725 struct bfd_link_info *info)
3726 {
3727 asection *tls_sec = elf_hash_table (info)->tls_sec;
3728
3729 if (tls_sec)
3730 {
3731 struct elf_link_hash_entry *tlsbase;
3732
3733 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3734 "_TLS_MODULE_BASE_",
3735 FALSE, FALSE, FALSE);
3736
3737 if (tlsbase && tlsbase->type == STT_TLS)
3738 {
3739 struct elf_i386_link_hash_table *htab;
3740 struct bfd_link_hash_entry *bh = NULL;
3741 const struct elf_backend_data *bed
3742 = get_elf_backend_data (output_bfd);
3743
3744 htab = elf_i386_hash_table (info);
3745 if (htab == NULL)
3746 return FALSE;
3747
3748 if (!(_bfd_generic_link_add_one_symbol
3749 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3750 tls_sec, 0, NULL, FALSE,
3751 bed->collect, &bh)))
3752 return FALSE;
3753
3754 htab->tls_module_base = bh;
3755
3756 tlsbase = (struct elf_link_hash_entry *)bh;
3757 tlsbase->def_regular = 1;
3758 tlsbase->other = STV_HIDDEN;
3759 tlsbase->root.linker_def = 1;
3760 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3761 }
3762 }
3763
3764 return TRUE;
3765 }
3766
3767 /* Set the correct type for an x86 ELF section. We do this by the
3768 section name, which is a hack, but ought to work. */
3769
3770 static bfd_boolean
3771 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3772 Elf_Internal_Shdr *hdr,
3773 asection *sec)
3774 {
3775 const char *name;
3776
3777 name = bfd_get_section_name (abfd, sec);
3778
3779 /* This is an ugly, but unfortunately necessary hack that is
3780 needed when producing EFI binaries on x86. It tells
3781 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3782 containing ELF relocation info. We need this hack in order to
3783 be able to generate ELF binaries that can be translated into
3784 EFI applications (which are essentially COFF objects). Those
3785 files contain a COFF ".reloc" section inside an ELFNN object,
3786 which would normally cause BFD to segfault because it would
3787 attempt to interpret this section as containing relocation
3788 entries for section "oc". With this hack enabled, ".reloc"
3789 will be treated as a normal data section, which will avoid the
3790 segfault. However, you won't be able to create an ELFNN binary
3791 with a section named "oc" that needs relocations, but that's
3792 the kind of ugly side-effects you get when detecting section
3793 types based on their names... In practice, this limitation is
3794 unlikely to bite. */
3795 if (strcmp (name, ".reloc") == 0)
3796 hdr->sh_type = SHT_PROGBITS;
3797
3798 return TRUE;
3799 }
3800
3801 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3802 executables. Rather than setting it to the beginning of the TLS
3803 section, we have to set it to the end. This function may be called
3804 multiple times, it is idempotent. */
3805
3806 static void
3807 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3808 {
3809 struct elf_i386_link_hash_table *htab;
3810 struct bfd_link_hash_entry *base;
3811
3812 if (!bfd_link_executable (info))
3813 return;
3814
3815 htab = elf_i386_hash_table (info);
3816 if (htab == NULL)
3817 return;
3818
3819 base = htab->tls_module_base;
3820 if (base == NULL)
3821 return;
3822
3823 base->u.def.value = htab->elf.tls_size;
3824 }
3825
3826 /* Return the base VMA address which should be subtracted from real addresses
3827 when resolving @dtpoff relocation.
3828 This is PT_TLS segment p_vaddr. */
3829
3830 static bfd_vma
3831 elf_i386_dtpoff_base (struct bfd_link_info *info)
3832 {
3833 /* If tls_sec is NULL, we should have signalled an error already. */
3834 if (elf_hash_table (info)->tls_sec == NULL)
3835 return 0;
3836 return elf_hash_table (info)->tls_sec->vma;
3837 }
3838
3839 /* Return the relocation value for @tpoff relocation
3840 if STT_TLS virtual address is ADDRESS. */
3841
3842 static bfd_vma
3843 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3844 {
3845 struct elf_link_hash_table *htab = elf_hash_table (info);
3846 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3847 bfd_vma static_tls_size;
3848
3849 /* If tls_sec is NULL, we should have signalled an error already. */
3850 if (htab->tls_sec == NULL)
3851 return 0;
3852
3853 /* Consider special static TLS alignment requirements. */
3854 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3855 return static_tls_size + htab->tls_sec->vma - address;
3856 }
3857
3858 /* Relocate an i386 ELF section. */
3859
3860 static bfd_boolean
3861 elf_i386_relocate_section (bfd *output_bfd,
3862 struct bfd_link_info *info,
3863 bfd *input_bfd,
3864 asection *input_section,
3865 bfd_byte *contents,
3866 Elf_Internal_Rela *relocs,
3867 Elf_Internal_Sym *local_syms,
3868 asection **local_sections)
3869 {
3870 struct elf_i386_link_hash_table *htab;
3871 Elf_Internal_Shdr *symtab_hdr;
3872 struct elf_link_hash_entry **sym_hashes;
3873 bfd_vma *local_got_offsets;
3874 bfd_vma *local_tlsdesc_gotents;
3875 Elf_Internal_Rela *rel;
3876 Elf_Internal_Rela *wrel;
3877 Elf_Internal_Rela *relend;
3878 bfd_boolean is_vxworks_tls;
3879 unsigned plt_entry_size;
3880
3881 BFD_ASSERT (is_i386_elf (input_bfd));
3882
3883 /* Skip if check_relocs failed. */
3884 if (input_section->check_relocs_failed)
3885 return FALSE;
3886
3887 htab = elf_i386_hash_table (info);
3888 if (htab == NULL)
3889 return FALSE;
3890 symtab_hdr = &elf_symtab_hdr (input_bfd);
3891 sym_hashes = elf_sym_hashes (input_bfd);
3892 local_got_offsets = elf_local_got_offsets (input_bfd);
3893 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3894 /* We have to handle relocations in vxworks .tls_vars sections
3895 specially, because the dynamic loader is 'weird'. */
3896 is_vxworks_tls = ((get_elf_i386_backend_data (output_bfd)->os
3897 == is_vxworks)
3898 && bfd_link_pic (info)
3899 && !strcmp (input_section->output_section->name,
3900 ".tls_vars"));
3901
3902 elf_i386_set_tls_module_base (info);
3903
3904 plt_entry_size = htab->plt.plt_entry_size;
3905
3906 rel = wrel = relocs;
3907 relend = relocs + input_section->reloc_count;
3908 for (; rel < relend; wrel++, rel++)
3909 {
3910 unsigned int r_type;
3911 reloc_howto_type *howto;
3912 unsigned long r_symndx;
3913 struct elf_link_hash_entry *h;
3914 struct elf_i386_link_hash_entry *eh;
3915 Elf_Internal_Sym *sym;
3916 asection *sec;
3917 bfd_vma off, offplt, plt_offset;
3918 bfd_vma relocation;
3919 bfd_boolean unresolved_reloc;
3920 bfd_reloc_status_type r;
3921 unsigned int indx;
3922 int tls_type;
3923 bfd_vma st_size;
3924 asection *resolved_plt;
3925 bfd_boolean resolved_to_zero;
3926 bfd_boolean relative_reloc;
3927
3928 r_type = ELF32_R_TYPE (rel->r_info);
3929 if (r_type == R_386_GNU_VTINHERIT
3930 || r_type == R_386_GNU_VTENTRY)
3931 {
3932 if (wrel != rel)
3933 *wrel = *rel;
3934 continue;
3935 }
3936
3937 if ((indx = r_type) >= R_386_standard
3938 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3939 >= R_386_ext - R_386_standard)
3940 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3941 >= R_386_ext2 - R_386_ext))
3942 {
3943 _bfd_error_handler
3944 /* xgettext:c-format */
3945 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3946 input_bfd, r_type, input_section);
3947 bfd_set_error (bfd_error_bad_value);
3948 return FALSE;
3949 }
3950 howto = elf_howto_table + indx;
3951
3952 r_symndx = ELF32_R_SYM (rel->r_info);
3953 h = NULL;
3954 sym = NULL;
3955 sec = NULL;
3956 unresolved_reloc = FALSE;
3957 if (r_symndx < symtab_hdr->sh_info)
3958 {
3959 sym = local_syms + r_symndx;
3960 sec = local_sections[r_symndx];
3961 relocation = (sec->output_section->vma
3962 + sec->output_offset
3963 + sym->st_value);
3964 st_size = sym->st_size;
3965
3966 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3967 && ((sec->flags & SEC_MERGE) != 0
3968 || (bfd_link_relocatable (info)
3969 && sec->output_offset != 0)))
3970 {
3971 bfd_vma addend;
3972 bfd_byte *where = contents + rel->r_offset;
3973
3974 switch (howto->size)
3975 {
3976 case 0:
3977 addend = bfd_get_8 (input_bfd, where);
3978 if (howto->pc_relative)
3979 {
3980 addend = (addend ^ 0x80) - 0x80;
3981 addend += 1;
3982 }
3983 break;
3984 case 1:
3985 addend = bfd_get_16 (input_bfd, where);
3986 if (howto->pc_relative)
3987 {
3988 addend = (addend ^ 0x8000) - 0x8000;
3989 addend += 2;
3990 }
3991 break;
3992 case 2:
3993 addend = bfd_get_32 (input_bfd, where);
3994 if (howto->pc_relative)
3995 {
3996 addend = (addend ^ 0x80000000) - 0x80000000;
3997 addend += 4;
3998 }
3999 break;
4000 default:
4001 abort ();
4002 }
4003
4004 if (bfd_link_relocatable (info))
4005 addend += sec->output_offset;
4006 else
4007 {
4008 asection *msec = sec;
4009 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
4010 addend);
4011 addend -= relocation;
4012 addend += msec->output_section->vma + msec->output_offset;
4013 }
4014
4015 switch (howto->size)
4016 {
4017 case 0:
4018 /* FIXME: overflow checks. */
4019 if (howto->pc_relative)
4020 addend -= 1;
4021 bfd_put_8 (input_bfd, addend, where);
4022 break;
4023 case 1:
4024 if (howto->pc_relative)
4025 addend -= 2;
4026 bfd_put_16 (input_bfd, addend, where);
4027 break;
4028 case 2:
4029 if (howto->pc_relative)
4030 addend -= 4;
4031 bfd_put_32 (input_bfd, addend, where);
4032 break;
4033 }
4034 }
4035 else if (!bfd_link_relocatable (info)
4036 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4037 {
4038 /* Relocate against local STT_GNU_IFUNC symbol. */
4039 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
4040 FALSE);
4041 if (h == NULL)
4042 abort ();
4043
4044 /* Set STT_GNU_IFUNC symbol value. */
4045 h->root.u.def.value = sym->st_value;
4046 h->root.u.def.section = sec;
4047 }
4048 }
4049 else
4050 {
4051 bfd_boolean warned ATTRIBUTE_UNUSED;
4052 bfd_boolean ignored ATTRIBUTE_UNUSED;
4053
4054 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
4055 r_symndx, symtab_hdr, sym_hashes,
4056 h, sec, relocation,
4057 unresolved_reloc, warned, ignored);
4058 st_size = h->size;
4059 }
4060
4061 if (sec != NULL && discarded_section (sec))
4062 {
4063 _bfd_clear_contents (howto, input_bfd, input_section,
4064 contents + rel->r_offset);
4065 wrel->r_offset = rel->r_offset;
4066 wrel->r_info = 0;
4067 wrel->r_addend = 0;
4068
4069 /* For ld -r, remove relocations in debug sections against
4070 sections defined in discarded sections. Not done for
4071 eh_frame editing code expects to be present. */
4072 if (bfd_link_relocatable (info)
4073 && (input_section->flags & SEC_DEBUGGING))
4074 wrel--;
4075
4076 continue;
4077 }
4078
4079 if (bfd_link_relocatable (info))
4080 {
4081 if (wrel != rel)
4082 *wrel = *rel;
4083 continue;
4084 }
4085
4086 eh = (struct elf_i386_link_hash_entry *) h;
4087
4088 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
4089 it here if it is defined in a non-shared object. */
4090 if (h != NULL
4091 && h->type == STT_GNU_IFUNC
4092 && h->def_regular)
4093 {
4094 asection *gotplt, *base_got;
4095 bfd_vma plt_index;
4096 const char *name;
4097
4098 if ((input_section->flags & SEC_ALLOC) == 0)
4099 {
4100 /* Dynamic relocs are not propagated for SEC_DEBUGGING
4101 sections because such sections are not SEC_ALLOC and
4102 thus ld.so will not process them. */
4103 if ((input_section->flags & SEC_DEBUGGING) != 0)
4104 continue;
4105 abort ();
4106 }
4107
4108 /* STT_GNU_IFUNC symbol must go through PLT. */
4109 if (htab->elf.splt != NULL)
4110 {
4111 if (htab->plt_second != NULL)
4112 {
4113 resolved_plt = htab->plt_second;
4114 plt_offset = eh->plt_second.offset;
4115 }
4116 else
4117 {
4118 resolved_plt = htab->elf.splt;
4119 plt_offset = h->plt.offset;
4120 }
4121 gotplt = htab->elf.sgotplt;
4122 }
4123 else
4124 {
4125 resolved_plt = htab->elf.iplt;
4126 plt_offset = h->plt.offset;
4127 gotplt = htab->elf.igotplt;
4128 }
4129
4130 switch (r_type)
4131 {
4132 default:
4133 break;
4134
4135 case R_386_GOT32:
4136 case R_386_GOT32X:
4137 base_got = htab->elf.sgot;
4138 off = h->got.offset;
4139
4140 if (base_got == NULL)
4141 abort ();
4142
4143 if (off == (bfd_vma) -1)
4144 {
4145 /* We can't use h->got.offset here to save state, or
4146 even just remember the offset, as finish_dynamic_symbol
4147 would use that as offset into .got. */
4148
4149 if (h->plt.offset == (bfd_vma) -1)
4150 abort ();
4151
4152 if (htab->elf.splt != NULL)
4153 {
4154 plt_index = (h->plt.offset / plt_entry_size
4155 - htab->plt.has_plt0);
4156 off = (plt_index + 3) * 4;
4157 base_got = htab->elf.sgotplt;
4158 }
4159 else
4160 {
4161 plt_index = h->plt.offset / plt_entry_size;
4162 off = plt_index * 4;
4163 base_got = htab->elf.igotplt;
4164 }
4165
4166 if (h->dynindx == -1
4167 || h->forced_local
4168 || info->symbolic)
4169 {
4170 /* This references the local defitionion. We must
4171 initialize this entry in the global offset table.
4172 Since the offset must always be a multiple of 8,
4173 we use the least significant bit to record
4174 whether we have initialized it already.
4175
4176 When doing a dynamic link, we create a .rela.got
4177 relocation entry to initialize the value. This
4178 is done in the finish_dynamic_symbol routine. */
4179 if ((off & 1) != 0)
4180 off &= ~1;
4181 else
4182 {
4183 bfd_put_32 (output_bfd, relocation,
4184 base_got->contents + off);
4185 h->got.offset |= 1;
4186 }
4187 }
4188
4189 relocation = off;
4190 }
4191 else
4192 relocation = (base_got->output_section->vma
4193 + base_got->output_offset + off
4194 - gotplt->output_section->vma
4195 - gotplt->output_offset);
4196
4197 if (rel->r_offset > 1
4198 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4199 && *(contents + rel->r_offset - 2) != 0x8d)
4200 {
4201 if (bfd_link_pic (info))
4202 goto disallow_got32;
4203
4204 /* Add the GOT base if there is no base register. */
4205 relocation += (gotplt->output_section->vma
4206 + gotplt->output_offset);
4207 }
4208 else if (htab->elf.splt == NULL)
4209 {
4210 /* Adjust for static executables. */
4211 relocation += gotplt->output_offset;
4212 }
4213
4214 goto do_relocation;
4215 }
4216
4217 if (h->plt.offset == (bfd_vma) -1)
4218 {
4219 /* Handle static pointers of STT_GNU_IFUNC symbols. */
4220 if (r_type == R_386_32
4221 && (input_section->flags & SEC_CODE) == 0)
4222 goto do_ifunc_pointer;
4223 goto bad_ifunc_reloc;
4224 }
4225
4226 relocation = (resolved_plt->output_section->vma
4227 + resolved_plt->output_offset + plt_offset);
4228
4229 switch (r_type)
4230 {
4231 default:
4232 bad_ifunc_reloc:
4233 if (h->root.root.string)
4234 name = h->root.root.string;
4235 else
4236 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4237 NULL);
4238 _bfd_error_handler
4239 /* xgettext:c-format */
4240 (_("%B: relocation %s against STT_GNU_IFUNC "
4241 "symbol `%s' isn't supported"), input_bfd,
4242 howto->name, name);
4243 bfd_set_error (bfd_error_bad_value);
4244 return FALSE;
4245
4246 case R_386_32:
4247 /* Generate dynamic relcoation only when there is a
4248 non-GOT reference in a shared object. */
4249 if ((bfd_link_pic (info) && h->non_got_ref)
4250 || h->plt.offset == (bfd_vma) -1)
4251 {
4252 Elf_Internal_Rela outrel;
4253 asection *sreloc;
4254 bfd_vma offset;
4255
4256 do_ifunc_pointer:
4257 /* Need a dynamic relocation to get the real function
4258 adddress. */
4259 offset = _bfd_elf_section_offset (output_bfd,
4260 info,
4261 input_section,
4262 rel->r_offset);
4263 if (offset == (bfd_vma) -1
4264 || offset == (bfd_vma) -2)
4265 abort ();
4266
4267 outrel.r_offset = (input_section->output_section->vma
4268 + input_section->output_offset
4269 + offset);
4270
4271 if (h->dynindx == -1
4272 || h->forced_local
4273 || bfd_link_executable (info))
4274 {
4275 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
4276 h->root.root.string,
4277 h->root.u.def.section->owner);
4278
4279 /* This symbol is resolved locally. */
4280 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4281 bfd_put_32 (output_bfd,
4282 (h->root.u.def.value
4283 + h->root.u.def.section->output_section->vma
4284 + h->root.u.def.section->output_offset),
4285 contents + offset);
4286 }
4287 else
4288 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4289
4290 /* Dynamic relocations are stored in
4291 1. .rel.ifunc section in PIC object.
4292 2. .rel.got section in dynamic executable.
4293 3. .rel.iplt section in static executable. */
4294 if (bfd_link_pic (info))
4295 sreloc = htab->elf.irelifunc;
4296 else if (htab->elf.splt != NULL)
4297 sreloc = htab->elf.srelgot;
4298 else
4299 sreloc = htab->elf.irelplt;
4300 elf_append_rel (output_bfd, sreloc, &outrel);
4301
4302 /* If this reloc is against an external symbol, we
4303 do not want to fiddle with the addend. Otherwise,
4304 we need to include the symbol value so that it
4305 becomes an addend for the dynamic reloc. For an
4306 internal symbol, we have updated addend. */
4307 continue;
4308 }
4309 /* FALLTHROUGH */
4310 case R_386_PC32:
4311 case R_386_PLT32:
4312 goto do_relocation;
4313
4314 case R_386_GOTOFF:
4315 relocation -= (gotplt->output_section->vma
4316 + gotplt->output_offset);
4317 goto do_relocation;
4318 }
4319 }
4320
4321 resolved_to_zero = (eh != NULL
4322 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
4323 eh->has_got_reloc,
4324 eh));
4325
4326 switch (r_type)
4327 {
4328 case R_386_GOT32X:
4329 /* Avoid optimizing _DYNAMIC since ld.so may use its
4330 link-time address. */
4331 if (h == htab->elf.hdynamic)
4332 goto r_386_got32;
4333
4334 if (bfd_link_pic (info))
4335 {
4336 /* It is OK to convert mov to lea and convert indirect
4337 branch to direct branch. It is OK to convert adc,
4338 add, and, cmp, or, sbb, sub, test, xor only when PIC
4339 is false. */
4340 unsigned int opcode, addend;
4341 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
4342 if (addend != 0)
4343 goto r_386_got32;
4344 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4345 if (opcode != 0x8b && opcode != 0xff)
4346 goto r_386_got32;
4347 }
4348
4349 /* Resolve "mov GOT[(%reg)], %reg",
4350 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4351 and "binop foo@GOT[(%reg)], %reg". */
4352 if (h == NULL
4353 || (h->plt.offset == (bfd_vma) -1
4354 && h->got.offset == (bfd_vma) -1)
4355 || htab->elf.sgotplt == NULL)
4356 abort ();
4357
4358 offplt = (htab->elf.sgotplt->output_section->vma
4359 + htab->elf.sgotplt->output_offset);
4360
4361 /* It is relative to .got.plt section. */
4362 if (h->got.offset != (bfd_vma) -1)
4363 /* Use GOT entry. Mask off the least significant bit in
4364 GOT offset which may be set by R_386_GOT32 processing
4365 below. */
4366 relocation = (htab->elf.sgot->output_section->vma
4367 + htab->elf.sgot->output_offset
4368 + (h->got.offset & ~1) - offplt);
4369 else
4370 /* Use GOTPLT entry. */
4371 relocation = (h->plt.offset / plt_entry_size
4372 - htab->plt.has_plt0 + 3) * 4;
4373
4374 if (!bfd_link_pic (info))
4375 {
4376 /* If not PIC, add the .got.plt section address for
4377 baseless addressing. */
4378 unsigned int modrm;
4379 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4380 if ((modrm & 0xc7) == 0x5)
4381 relocation += offplt;
4382 }
4383
4384 unresolved_reloc = FALSE;
4385 break;
4386
4387 case R_386_GOT32:
4388 r_386_got32:
4389 /* Relocation is to the entry for this symbol in the global
4390 offset table. */
4391 if (htab->elf.sgot == NULL)
4392 abort ();
4393
4394 relative_reloc = FALSE;
4395 if (h != NULL)
4396 {
4397 bfd_boolean dyn;
4398
4399 off = h->got.offset;
4400 dyn = htab->elf.dynamic_sections_created;
4401 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4402 bfd_link_pic (info),
4403 h)
4404 || (bfd_link_pic (info)
4405 && SYMBOL_REFERENCES_LOCAL (info, h))
4406 || (ELF_ST_VISIBILITY (h->other)
4407 && h->root.type == bfd_link_hash_undefweak))
4408 {
4409 /* This is actually a static link, or it is a
4410 -Bsymbolic link and the symbol is defined
4411 locally, or the symbol was forced to be local
4412 because of a version file. We must initialize
4413 this entry in the global offset table. Since the
4414 offset must always be a multiple of 4, we use the
4415 least significant bit to record whether we have
4416 initialized it already.
4417
4418 When doing a dynamic link, we create a .rel.got
4419 relocation entry to initialize the value. This
4420 is done in the finish_dynamic_symbol routine. */
4421 if ((off & 1) != 0)
4422 off &= ~1;
4423 else
4424 {
4425 bfd_put_32 (output_bfd, relocation,
4426 htab->elf.sgot->contents + off);
4427 h->got.offset |= 1;
4428
4429 if (h->dynindx == -1
4430 && !h->forced_local
4431 && h->root.type != bfd_link_hash_undefweak
4432 && bfd_link_pic (info))
4433 {
4434 /* PR ld/21402: If this symbol isn't dynamic
4435 in PIC, generate R_386_RELATIVE here. */
4436 eh->no_finish_dynamic_symbol = 1;
4437 relative_reloc = TRUE;
4438 }
4439 }
4440 }
4441 else
4442 unresolved_reloc = FALSE;
4443 }
4444 else
4445 {
4446 if (local_got_offsets == NULL)
4447 abort ();
4448
4449 off = local_got_offsets[r_symndx];
4450
4451 /* The offset must always be a multiple of 4. We use
4452 the least significant bit to record whether we have
4453 already generated the necessary reloc. */
4454 if ((off & 1) != 0)
4455 off &= ~1;
4456 else
4457 {
4458 bfd_put_32 (output_bfd, relocation,
4459 htab->elf.sgot->contents + off);
4460 local_got_offsets[r_symndx] |= 1;
4461
4462 if (bfd_link_pic (info))
4463 relative_reloc = TRUE;
4464 }
4465 }
4466
4467 if (relative_reloc)
4468 {
4469 asection *s;
4470 Elf_Internal_Rela outrel;
4471
4472 s = htab->elf.srelgot;
4473 if (s == NULL)
4474 abort ();
4475
4476 outrel.r_offset = (htab->elf.sgot->output_section->vma
4477 + htab->elf.sgot->output_offset
4478 + off);
4479 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4480 elf_append_rel (output_bfd, s, &outrel);
4481 }
4482
4483 if (off >= (bfd_vma) -2)
4484 abort ();
4485
4486 relocation = (htab->elf.sgot->output_section->vma
4487 + htab->elf.sgot->output_offset + off);
4488 if (rel->r_offset > 1
4489 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
4490 && *(contents + rel->r_offset - 2) != 0x8d)
4491 {
4492 if (bfd_link_pic (info))
4493 {
4494 /* For PIC, disallow R_386_GOT32 without a base
4495 register, except for "lea foo@GOT, %reg", since
4496 we don't know what the GOT base is. */
4497 const char *name;
4498
4499 disallow_got32:
4500 if (h == NULL || h->root.root.string == NULL)
4501 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
4502 NULL);
4503 else
4504 name = h->root.root.string;
4505
4506 _bfd_error_handler
4507 /* xgettext:c-format */
4508 (_("%B: direct GOT relocation %s against `%s'"
4509 " without base register can not be used"
4510 " when making a shared object"),
4511 input_bfd, howto->name, name);
4512 bfd_set_error (bfd_error_bad_value);
4513 return FALSE;
4514 }
4515 }
4516 else
4517 {
4518 /* Subtract the .got.plt section address only with a base
4519 register. */
4520 relocation -= (htab->elf.sgotplt->output_section->vma
4521 + htab->elf.sgotplt->output_offset);
4522 }
4523
4524 break;
4525
4526 case R_386_GOTOFF:
4527 /* Relocation is relative to the start of the global offset
4528 table. */
4529
4530 /* Check to make sure it isn't a protected function or data
4531 symbol for shared library since it may not be local when
4532 used as function address or with copy relocation. We also
4533 need to make sure that a symbol is referenced locally. */
4534 if (!bfd_link_executable (info) && h)
4535 {
4536 if (!h->def_regular)
4537 {
4538 const char *v;
4539
4540 switch (ELF_ST_VISIBILITY (h->other))
4541 {
4542 case STV_HIDDEN:
4543 v = _("hidden symbol");
4544 break;
4545 case STV_INTERNAL:
4546 v = _("internal symbol");
4547 break;
4548 case STV_PROTECTED:
4549 v = _("protected symbol");
4550 break;
4551 default:
4552 v = _("symbol");
4553 break;
4554 }
4555
4556 _bfd_error_handler
4557 /* xgettext:c-format */
4558 (_("%B: relocation R_386_GOTOFF against undefined %s"
4559 " `%s' can not be used when making a shared object"),
4560 input_bfd, v, h->root.root.string);
4561 bfd_set_error (bfd_error_bad_value);
4562 return FALSE;
4563 }
4564 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4565 && (h->type == STT_FUNC
4566 || h->type == STT_OBJECT)
4567 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4568 {
4569 _bfd_error_handler
4570 /* xgettext:c-format */
4571 (_("%B: relocation R_386_GOTOFF against protected %s"
4572 " `%s' can not be used when making a shared object"),
4573 input_bfd,
4574 h->type == STT_FUNC ? "function" : "data",
4575 h->root.root.string);
4576 bfd_set_error (bfd_error_bad_value);
4577 return FALSE;
4578 }
4579 }
4580
4581 /* Note that sgot is not involved in this
4582 calculation. We always want the start of .got.plt. If we
4583 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4584 permitted by the ABI, we might have to change this
4585 calculation. */
4586 relocation -= htab->elf.sgotplt->output_section->vma
4587 + htab->elf.sgotplt->output_offset;
4588 break;
4589
4590 case R_386_GOTPC:
4591 /* Use global offset table as symbol value. */
4592 relocation = htab->elf.sgotplt->output_section->vma
4593 + htab->elf.sgotplt->output_offset;
4594 unresolved_reloc = FALSE;
4595 break;
4596
4597 case R_386_PLT32:
4598 /* Relocation is to the entry for this symbol in the
4599 procedure linkage table. */
4600
4601 /* Resolve a PLT32 reloc against a local symbol directly,
4602 without using the procedure linkage table. */
4603 if (h == NULL)
4604 break;
4605
4606 if ((h->plt.offset == (bfd_vma) -1
4607 && eh->plt_got.offset == (bfd_vma) -1)
4608 || htab->elf.splt == NULL)
4609 {
4610 /* We didn't make a PLT entry for this symbol. This
4611 happens when statically linking PIC code, or when
4612 using -Bsymbolic. */
4613 break;
4614 }
4615
4616 if (h->plt.offset != (bfd_vma) -1)
4617 {
4618 if (htab->plt_second != NULL)
4619 {
4620 resolved_plt = htab->plt_second;
4621 plt_offset = eh->plt_second.offset;
4622 }
4623 else
4624 {
4625 resolved_plt = htab->elf.splt;
4626 plt_offset = h->plt.offset;
4627 }
4628 }
4629 else
4630 {
4631 resolved_plt = htab->plt_got;
4632 plt_offset = eh->plt_got.offset;
4633 }
4634
4635 relocation = (resolved_plt->output_section->vma
4636 + resolved_plt->output_offset
4637 + plt_offset);
4638 unresolved_reloc = FALSE;
4639 break;
4640
4641 case R_386_SIZE32:
4642 /* Set to symbol size. */
4643 relocation = st_size;
4644 /* Fall through. */
4645
4646 case R_386_32:
4647 case R_386_PC32:
4648 if ((input_section->flags & SEC_ALLOC) == 0
4649 || is_vxworks_tls)
4650 break;
4651
4652 /* Copy dynamic function pointer relocations. Don't generate
4653 dynamic relocations against resolved undefined weak symbols
4654 in PIE, except for R_386_PC32. */
4655 if ((bfd_link_pic (info)
4656 && (h == NULL
4657 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4658 && (!resolved_to_zero
4659 || r_type == R_386_PC32))
4660 || h->root.type != bfd_link_hash_undefweak))
4661 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4662 || !SYMBOL_CALLS_LOCAL (info, h)))
4663 || (ELIMINATE_COPY_RELOCS
4664 && !bfd_link_pic (info)
4665 && h != NULL
4666 && h->dynindx != -1
4667 && (!h->non_got_ref
4668 || eh->func_pointer_refcount > 0
4669 || (h->root.type == bfd_link_hash_undefweak
4670 && !resolved_to_zero))
4671 && ((h->def_dynamic && !h->def_regular)
4672 /* Undefined weak symbol is bound locally when
4673 PIC is false. */
4674 || h->root.type == bfd_link_hash_undefweak)))
4675 {
4676 Elf_Internal_Rela outrel;
4677 bfd_boolean skip, relocate;
4678 asection *sreloc;
4679
4680 /* When generating a shared object, these relocations
4681 are copied into the output file to be resolved at run
4682 time. */
4683
4684 skip = FALSE;
4685 relocate = FALSE;
4686
4687 outrel.r_offset =
4688 _bfd_elf_section_offset (output_bfd, info, input_section,
4689 rel->r_offset);
4690 if (outrel.r_offset == (bfd_vma) -1)
4691 skip = TRUE;
4692 else if (outrel.r_offset == (bfd_vma) -2)
4693 skip = TRUE, relocate = TRUE;
4694 outrel.r_offset += (input_section->output_section->vma
4695 + input_section->output_offset);
4696
4697 if (skip)
4698 memset (&outrel, 0, sizeof outrel);
4699 else if (h != NULL
4700 && h->dynindx != -1
4701 && (r_type == R_386_PC32
4702 || !(bfd_link_executable (info)
4703 || SYMBOLIC_BIND (info, h))
4704 || !h->def_regular))
4705 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4706 else
4707 {
4708 /* This symbol is local, or marked to become local. */
4709 relocate = TRUE;
4710 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4711 }
4712
4713 sreloc = elf_section_data (input_section)->sreloc;
4714
4715 if (sreloc == NULL || sreloc->contents == NULL)
4716 {
4717 r = bfd_reloc_notsupported;
4718 goto check_relocation_error;
4719 }
4720
4721 elf_append_rel (output_bfd, sreloc, &outrel);
4722
4723 /* If this reloc is against an external symbol, we do
4724 not want to fiddle with the addend. Otherwise, we
4725 need to include the symbol value so that it becomes
4726 an addend for the dynamic reloc. */
4727 if (! relocate)
4728 continue;
4729 }
4730 break;
4731
4732 case R_386_TLS_IE:
4733 if (!bfd_link_executable (info))
4734 {
4735 Elf_Internal_Rela outrel;
4736 asection *sreloc;
4737
4738 outrel.r_offset = rel->r_offset
4739 + input_section->output_section->vma
4740 + input_section->output_offset;
4741 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4742 sreloc = elf_section_data (input_section)->sreloc;
4743 if (sreloc == NULL)
4744 abort ();
4745 elf_append_rel (output_bfd, sreloc, &outrel);
4746 }
4747 /* Fall through */
4748
4749 case R_386_TLS_GD:
4750 case R_386_TLS_GOTDESC:
4751 case R_386_TLS_DESC_CALL:
4752 case R_386_TLS_IE_32:
4753 case R_386_TLS_GOTIE:
4754 tls_type = GOT_UNKNOWN;
4755 if (h == NULL && local_got_offsets)
4756 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4757 else if (h != NULL)
4758 tls_type = elf_i386_hash_entry(h)->tls_type;
4759 if (tls_type == GOT_TLS_IE)
4760 tls_type = GOT_TLS_IE_NEG;
4761
4762 if (! elf_i386_tls_transition (info, input_bfd,
4763 input_section, contents,
4764 symtab_hdr, sym_hashes,
4765 &r_type, tls_type, rel,
4766 relend, h, r_symndx, TRUE))
4767 return FALSE;
4768
4769 if (r_type == R_386_TLS_LE_32)
4770 {
4771 BFD_ASSERT (! unresolved_reloc);
4772 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4773 {
4774 unsigned int type;
4775 bfd_vma roff;
4776
4777 /* GD->LE transition. */
4778 type = *(contents + rel->r_offset - 2);
4779 if (type == 0x04)
4780 {
4781 /* Change
4782 leal foo@tlsgd(,%ebx,1), %eax
4783 call ___tls_get_addr@PLT
4784 into:
4785 movl %gs:0, %eax
4786 subl $foo@tpoff, %eax
4787 (6 byte form of subl). */
4788 roff = rel->r_offset + 5;
4789 }
4790 else
4791 {
4792 /* Change
4793 leal foo@tlsgd(%ebx), %eax
4794 call ___tls_get_addr@PLT
4795 nop
4796 or
4797 leal foo@tlsgd(%reg), %eax
4798 call *___tls_get_addr@GOT(%reg)
4799 which may be converted to
4800 addr32 call ___tls_get_addr
4801 into:
4802 movl %gs:0, %eax; subl $foo@tpoff, %eax
4803 (6 byte form of subl). */
4804 roff = rel->r_offset + 6;
4805 }
4806 memcpy (contents + roff - 8,
4807 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4808 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4809 contents + roff);
4810 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
4811 rel++;
4812 wrel++;
4813 continue;
4814 }
4815 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4816 {
4817 /* GDesc -> LE transition.
4818 It's originally something like:
4819 leal x@tlsdesc(%ebx), %eax
4820
4821 leal x@ntpoff, %eax
4822
4823 Registers other than %eax may be set up here. */
4824
4825 unsigned int val;
4826 bfd_vma roff;
4827
4828 roff = rel->r_offset;
4829 val = bfd_get_8 (input_bfd, contents + roff - 1);
4830
4831 /* Now modify the instruction as appropriate. */
4832 /* aoliva FIXME: remove the above and xor the byte
4833 below with 0x86. */
4834 bfd_put_8 (output_bfd, val ^ 0x86,
4835 contents + roff - 1);
4836 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4837 contents + roff);
4838 continue;
4839 }
4840 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4841 {
4842 /* GDesc -> LE transition.
4843 It's originally:
4844 call *(%eax)
4845 Turn it into:
4846 xchg %ax,%ax */
4847
4848 bfd_vma roff;
4849
4850 roff = rel->r_offset;
4851 bfd_put_8 (output_bfd, 0x66, contents + roff);
4852 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4853 continue;
4854 }
4855 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4856 {
4857 unsigned int val;
4858
4859 /* IE->LE transition:
4860 Originally it can be one of:
4861 movl foo, %eax
4862 movl foo, %reg
4863 addl foo, %reg
4864 We change it into:
4865 movl $foo, %eax
4866 movl $foo, %reg
4867 addl $foo, %reg. */
4868 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4869 if (val == 0xa1)
4870 {
4871 /* movl foo, %eax. */
4872 bfd_put_8 (output_bfd, 0xb8,
4873 contents + rel->r_offset - 1);
4874 }
4875 else
4876 {
4877 unsigned int type;
4878
4879 type = bfd_get_8 (input_bfd,
4880 contents + rel->r_offset - 2);
4881 switch (type)
4882 {
4883 case 0x8b:
4884 /* movl */
4885 bfd_put_8 (output_bfd, 0xc7,
4886 contents + rel->r_offset - 2);
4887 bfd_put_8 (output_bfd,
4888 0xc0 | ((val >> 3) & 7),
4889 contents + rel->r_offset - 1);
4890 break;
4891 case 0x03:
4892 /* addl */
4893 bfd_put_8 (output_bfd, 0x81,
4894 contents + rel->r_offset - 2);
4895 bfd_put_8 (output_bfd,
4896 0xc0 | ((val >> 3) & 7),
4897 contents + rel->r_offset - 1);
4898 break;
4899 default:
4900 BFD_FAIL ();
4901 break;
4902 }
4903 }
4904 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4905 contents + rel->r_offset);
4906 continue;
4907 }
4908 else
4909 {
4910 unsigned int val, type;
4911
4912 /* {IE_32,GOTIE}->LE transition:
4913 Originally it can be one of:
4914 subl foo(%reg1), %reg2
4915 movl foo(%reg1), %reg2
4916 addl foo(%reg1), %reg2
4917 We change it into:
4918 subl $foo, %reg2
4919 movl $foo, %reg2 (6 byte form)
4920 addl $foo, %reg2. */
4921 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4922 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4923 if (type == 0x8b)
4924 {
4925 /* movl */
4926 bfd_put_8 (output_bfd, 0xc7,
4927 contents + rel->r_offset - 2);
4928 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4929 contents + rel->r_offset - 1);
4930 }
4931 else if (type == 0x2b)
4932 {
4933 /* subl */
4934 bfd_put_8 (output_bfd, 0x81,
4935 contents + rel->r_offset - 2);
4936 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4937 contents + rel->r_offset - 1);
4938 }
4939 else if (type == 0x03)
4940 {
4941 /* addl */
4942 bfd_put_8 (output_bfd, 0x81,
4943 contents + rel->r_offset - 2);
4944 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4945 contents + rel->r_offset - 1);
4946 }
4947 else
4948 BFD_FAIL ();
4949 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4950 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4951 contents + rel->r_offset);
4952 else
4953 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4954 contents + rel->r_offset);
4955 continue;
4956 }
4957 }
4958
4959 if (htab->elf.sgot == NULL)
4960 abort ();
4961
4962 if (h != NULL)
4963 {
4964 off = h->got.offset;
4965 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4966 }
4967 else
4968 {
4969 if (local_got_offsets == NULL)
4970 abort ();
4971
4972 off = local_got_offsets[r_symndx];
4973 offplt = local_tlsdesc_gotents[r_symndx];
4974 }
4975
4976 if ((off & 1) != 0)
4977 off &= ~1;
4978 else
4979 {
4980 Elf_Internal_Rela outrel;
4981 int dr_type;
4982 asection *sreloc;
4983
4984 if (htab->elf.srelgot == NULL)
4985 abort ();
4986
4987 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4988
4989 if (GOT_TLS_GDESC_P (tls_type))
4990 {
4991 bfd_byte *loc;
4992 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4993 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4994 <= htab->elf.sgotplt->size);
4995 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4996 + htab->elf.sgotplt->output_offset
4997 + offplt
4998 + htab->sgotplt_jump_table_size);
4999 sreloc = htab->elf.srelplt;
5000 loc = sreloc->contents;
5001 loc += (htab->next_tls_desc_index++
5002 * sizeof (Elf32_External_Rel));
5003 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
5004 <= sreloc->contents + sreloc->size);
5005 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
5006 if (indx == 0)
5007 {
5008 BFD_ASSERT (! unresolved_reloc);
5009 bfd_put_32 (output_bfd,
5010 relocation - elf_i386_dtpoff_base (info),
5011 htab->elf.sgotplt->contents + offplt
5012 + htab->sgotplt_jump_table_size + 4);
5013 }
5014 else
5015 {
5016 bfd_put_32 (output_bfd, 0,
5017 htab->elf.sgotplt->contents + offplt
5018 + htab->sgotplt_jump_table_size + 4);
5019 }
5020 }
5021
5022 sreloc = htab->elf.srelgot;
5023
5024 outrel.r_offset = (htab->elf.sgot->output_section->vma
5025 + htab->elf.sgot->output_offset + off);
5026
5027 if (GOT_TLS_GD_P (tls_type))
5028 dr_type = R_386_TLS_DTPMOD32;
5029 else if (GOT_TLS_GDESC_P (tls_type))
5030 goto dr_done;
5031 else if (tls_type == GOT_TLS_IE_POS)
5032 dr_type = R_386_TLS_TPOFF;
5033 else
5034 dr_type = R_386_TLS_TPOFF32;
5035
5036 if (dr_type == R_386_TLS_TPOFF && indx == 0)
5037 bfd_put_32 (output_bfd,
5038 relocation - elf_i386_dtpoff_base (info),
5039 htab->elf.sgot->contents + off);
5040 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
5041 bfd_put_32 (output_bfd,
5042 elf_i386_dtpoff_base (info) - relocation,
5043 htab->elf.sgot->contents + off);
5044 else if (dr_type != R_386_TLS_DESC)
5045 bfd_put_32 (output_bfd, 0,
5046 htab->elf.sgot->contents + off);
5047 outrel.r_info = ELF32_R_INFO (indx, dr_type);
5048
5049 elf_append_rel (output_bfd, sreloc, &outrel);
5050
5051 if (GOT_TLS_GD_P (tls_type))
5052 {
5053 if (indx == 0)
5054 {
5055 BFD_ASSERT (! unresolved_reloc);
5056 bfd_put_32 (output_bfd,
5057 relocation - elf_i386_dtpoff_base (info),
5058 htab->elf.sgot->contents + off + 4);
5059 }
5060 else
5061 {
5062 bfd_put_32 (output_bfd, 0,
5063 htab->elf.sgot->contents + off + 4);
5064 outrel.r_info = ELF32_R_INFO (indx,
5065 R_386_TLS_DTPOFF32);
5066 outrel.r_offset += 4;
5067 elf_append_rel (output_bfd, sreloc, &outrel);
5068 }
5069 }
5070 else if (tls_type == GOT_TLS_IE_BOTH)
5071 {
5072 bfd_put_32 (output_bfd,
5073 (indx == 0
5074 ? relocation - elf_i386_dtpoff_base (info)
5075 : 0),
5076 htab->elf.sgot->contents + off + 4);
5077 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5078 outrel.r_offset += 4;
5079 elf_append_rel (output_bfd, sreloc, &outrel);
5080 }
5081
5082 dr_done:
5083 if (h != NULL)
5084 h->got.offset |= 1;
5085 else
5086 local_got_offsets[r_symndx] |= 1;
5087 }
5088
5089 if (off >= (bfd_vma) -2
5090 && ! GOT_TLS_GDESC_P (tls_type))
5091 abort ();
5092 if (r_type == R_386_TLS_GOTDESC
5093 || r_type == R_386_TLS_DESC_CALL)
5094 {
5095 relocation = htab->sgotplt_jump_table_size + offplt;
5096 unresolved_reloc = FALSE;
5097 }
5098 else if (r_type == ELF32_R_TYPE (rel->r_info))
5099 {
5100 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
5101 + htab->elf.sgotplt->output_offset;
5102 relocation = htab->elf.sgot->output_section->vma
5103 + htab->elf.sgot->output_offset + off - g_o_t;
5104 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
5105 && tls_type == GOT_TLS_IE_BOTH)
5106 relocation += 4;
5107 if (r_type == R_386_TLS_IE)
5108 relocation += g_o_t;
5109 unresolved_reloc = FALSE;
5110 }
5111 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
5112 {
5113 unsigned int val, type;
5114 bfd_vma roff;
5115
5116 /* GD->IE transition. */
5117 type = *(contents + rel->r_offset - 2);
5118 val = *(contents + rel->r_offset - 1);
5119 if (type == 0x04)
5120 {
5121 /* Change
5122 leal foo@tlsgd(,%ebx,1), %eax
5123 call ___tls_get_addr@PLT
5124 into:
5125 movl %gs:0, %eax
5126 subl $foo@gottpoff(%ebx), %eax. */
5127 val >>= 3;
5128 roff = rel->r_offset - 3;
5129 }
5130 else
5131 {
5132 /* Change
5133 leal foo@tlsgd(%ebx), %eax
5134 call ___tls_get_addr@PLT
5135 nop
5136 or
5137 leal foo@tlsgd(%reg), %eax
5138 call *___tls_get_addr@GOT(%reg)
5139 which may be converted to
5140 addr32 call ___tls_get_addr
5141 into:
5142 movl %gs:0, %eax;
5143 subl $foo@gottpoff(%reg), %eax. */
5144 roff = rel->r_offset - 2;
5145 }
5146 memcpy (contents + roff,
5147 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
5148 contents[roff + 7] = 0x80 | (val & 7);
5149 /* If foo is used only with foo@gotntpoff(%reg) and
5150 foo@indntpoff, but not with foo@gottpoff(%reg), change
5151 subl $foo@gottpoff(%reg), %eax
5152 into:
5153 addl $foo@gotntpoff(%reg), %eax. */
5154 if (tls_type == GOT_TLS_IE_POS)
5155 contents[roff + 6] = 0x03;
5156 bfd_put_32 (output_bfd,
5157 htab->elf.sgot->output_section->vma
5158 + htab->elf.sgot->output_offset + off
5159 - htab->elf.sgotplt->output_section->vma
5160 - htab->elf.sgotplt->output_offset,
5161 contents + roff + 8);
5162 /* Skip R_386_PLT32 and R_386_GOT32X. */
5163 rel++;
5164 wrel++;
5165 continue;
5166 }
5167 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
5168 {
5169 /* GDesc -> IE transition.
5170 It's originally something like:
5171 leal x@tlsdesc(%ebx), %eax
5172
5173 Change it to:
5174 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
5175 or:
5176 movl x@gottpoff(%ebx), %eax # before negl %eax
5177
5178 Registers other than %eax may be set up here. */
5179
5180 bfd_vma roff;
5181
5182 /* First, make sure it's a leal adding ebx to a 32-bit
5183 offset into any register, although it's probably
5184 almost always going to be eax. */
5185 roff = rel->r_offset;
5186
5187 /* Now modify the instruction as appropriate. */
5188 /* To turn a leal into a movl in the form we use it, it
5189 suffices to change the first byte from 0x8d to 0x8b.
5190 aoliva FIXME: should we decide to keep the leal, all
5191 we have to do is remove the statement below, and
5192 adjust the relaxation of R_386_TLS_DESC_CALL. */
5193 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
5194
5195 if (tls_type == GOT_TLS_IE_BOTH)
5196 off += 4;
5197
5198 bfd_put_32 (output_bfd,
5199 htab->elf.sgot->output_section->vma
5200 + htab->elf.sgot->output_offset + off
5201 - htab->elf.sgotplt->output_section->vma
5202 - htab->elf.sgotplt->output_offset,
5203 contents + roff);
5204 continue;
5205 }
5206 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
5207 {
5208 /* GDesc -> IE transition.
5209 It's originally:
5210 call *(%eax)
5211
5212 Change it to:
5213 xchg %ax,%ax
5214 or
5215 negl %eax
5216 depending on how we transformed the TLS_GOTDESC above.
5217 */
5218
5219 bfd_vma roff;
5220
5221 roff = rel->r_offset;
5222
5223 /* Now modify the instruction as appropriate. */
5224 if (tls_type != GOT_TLS_IE_NEG)
5225 {
5226 /* xchg %ax,%ax */
5227 bfd_put_8 (output_bfd, 0x66, contents + roff);
5228 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
5229 }
5230 else
5231 {
5232 /* negl %eax */
5233 bfd_put_8 (output_bfd, 0xf7, contents + roff);
5234 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
5235 }
5236
5237 continue;
5238 }
5239 else
5240 BFD_ASSERT (FALSE);
5241 break;
5242
5243 case R_386_TLS_LDM:
5244 if (! elf_i386_tls_transition (info, input_bfd,
5245 input_section, contents,
5246 symtab_hdr, sym_hashes,
5247 &r_type, GOT_UNKNOWN, rel,
5248 relend, h, r_symndx, TRUE))
5249 return FALSE;
5250
5251 if (r_type != R_386_TLS_LDM)
5252 {
5253 /* LD->LE transition. Change
5254 leal foo@tlsldm(%ebx) %eax
5255 call ___tls_get_addr@PLT
5256 into:
5257 movl %gs:0, %eax
5258 nop
5259 leal 0(%esi,1), %esi
5260 or change
5261 leal foo@tlsldm(%reg) %eax
5262 call *___tls_get_addr@GOT(%reg)
5263 which may be converted to
5264 addr32 call ___tls_get_addr
5265 into:
5266 movl %gs:0, %eax
5267 leal 0(%esi), %esi */
5268 BFD_ASSERT (r_type == R_386_TLS_LE_32);
5269 if (*(contents + rel->r_offset + 4) == 0xff
5270 || *(contents + rel->r_offset + 4) == 0x67)
5271 memcpy (contents + rel->r_offset - 2,
5272 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
5273 else
5274 memcpy (contents + rel->r_offset - 2,
5275 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
5276 /* Skip R_386_PC32/R_386_PLT32. */
5277 rel++;
5278 wrel++;
5279 continue;
5280 }
5281
5282 if (htab->elf.sgot == NULL)
5283 abort ();
5284
5285 off = htab->tls_ldm_got.offset;
5286 if (off & 1)
5287 off &= ~1;
5288 else
5289 {
5290 Elf_Internal_Rela outrel;
5291
5292 if (htab->elf.srelgot == NULL)
5293 abort ();
5294
5295 outrel.r_offset = (htab->elf.sgot->output_section->vma
5296 + htab->elf.sgot->output_offset + off);
5297
5298 bfd_put_32 (output_bfd, 0,
5299 htab->elf.sgot->contents + off);
5300 bfd_put_32 (output_bfd, 0,
5301 htab->elf.sgot->contents + off + 4);
5302 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
5303 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
5304 htab->tls_ldm_got.offset |= 1;
5305 }
5306 relocation = htab->elf.sgot->output_section->vma
5307 + htab->elf.sgot->output_offset + off
5308 - htab->elf.sgotplt->output_section->vma
5309 - htab->elf.sgotplt->output_offset;
5310 unresolved_reloc = FALSE;
5311 break;
5312
5313 case R_386_TLS_LDO_32:
5314 if (!bfd_link_executable (info)
5315 || (input_section->flags & SEC_CODE) == 0)
5316 relocation -= elf_i386_dtpoff_base (info);
5317 else
5318 /* When converting LDO to LE, we must negate. */
5319 relocation = -elf_i386_tpoff (info, relocation);
5320 break;
5321
5322 case R_386_TLS_LE_32:
5323 case R_386_TLS_LE:
5324 if (!bfd_link_executable (info))
5325 {
5326 Elf_Internal_Rela outrel;
5327 asection *sreloc;
5328
5329 outrel.r_offset = rel->r_offset
5330 + input_section->output_section->vma
5331 + input_section->output_offset;
5332 if (h != NULL && h->dynindx != -1)
5333 indx = h->dynindx;
5334 else
5335 indx = 0;
5336 if (r_type == R_386_TLS_LE_32)
5337 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
5338 else
5339 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
5340 sreloc = elf_section_data (input_section)->sreloc;
5341 if (sreloc == NULL)
5342 abort ();
5343 elf_append_rel (output_bfd, sreloc, &outrel);
5344 if (indx)
5345 continue;
5346 else if (r_type == R_386_TLS_LE_32)
5347 relocation = elf_i386_dtpoff_base (info) - relocation;
5348 else
5349 relocation -= elf_i386_dtpoff_base (info);
5350 }
5351 else if (r_type == R_386_TLS_LE_32)
5352 relocation = elf_i386_tpoff (info, relocation);
5353 else
5354 relocation = -elf_i386_tpoff (info, relocation);
5355 break;
5356
5357 default:
5358 break;
5359 }
5360
5361 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
5362 because such sections are not SEC_ALLOC and thus ld.so will
5363 not process them. */
5364 if (unresolved_reloc
5365 && !((input_section->flags & SEC_DEBUGGING) != 0
5366 && h->def_dynamic)
5367 && _bfd_elf_section_offset (output_bfd, info, input_section,
5368 rel->r_offset) != (bfd_vma) -1)
5369 {
5370 _bfd_error_handler
5371 /* xgettext:c-format */
5372 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
5373 input_bfd,
5374 input_section,
5375 (long) rel->r_offset,
5376 howto->name,
5377 h->root.root.string);
5378 return FALSE;
5379 }
5380
5381 do_relocation:
5382 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
5383 contents, rel->r_offset,
5384 relocation, 0);
5385
5386 check_relocation_error:
5387 if (r != bfd_reloc_ok)
5388 {
5389 const char *name;
5390
5391 if (h != NULL)
5392 name = h->root.root.string;
5393 else
5394 {
5395 name = bfd_elf_string_from_elf_section (input_bfd,
5396 symtab_hdr->sh_link,
5397 sym->st_name);
5398 if (name == NULL)
5399 return FALSE;
5400 if (*name == '\0')
5401 name = bfd_section_name (input_bfd, sec);
5402 }
5403
5404 if (r == bfd_reloc_overflow)
5405 (*info->callbacks->reloc_overflow)
5406 (info, (h ? &h->root : NULL), name, howto->name,
5407 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
5408 else
5409 {
5410 _bfd_error_handler
5411 /* xgettext:c-format */
5412 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
5413 input_bfd, input_section,
5414 (long) rel->r_offset, name, (int) r);
5415 return FALSE;
5416 }
5417 }
5418
5419 if (wrel != rel)
5420 *wrel = *rel;
5421 }
5422
5423 if (wrel != rel)
5424 {
5425 Elf_Internal_Shdr *rel_hdr;
5426 size_t deleted = rel - wrel;
5427
5428 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
5429 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5430 if (rel_hdr->sh_size == 0)
5431 {
5432 /* It is too late to remove an empty reloc section. Leave
5433 one NONE reloc.
5434 ??? What is wrong with an empty section??? */
5435 rel_hdr->sh_size = rel_hdr->sh_entsize;
5436 deleted -= 1;
5437 }
5438 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
5439 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
5440 input_section->reloc_count -= deleted;
5441 }
5442
5443 return TRUE;
5444 }
5445
5446 /* Finish up dynamic symbol handling. We set the contents of various
5447 dynamic sections here. */
5448
5449 static bfd_boolean
5450 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5451 struct bfd_link_info *info,
5452 struct elf_link_hash_entry *h,
5453 Elf_Internal_Sym *sym)
5454 {
5455 struct elf_i386_link_hash_table *htab;
5456 unsigned plt_entry_size;
5457 const struct elf_i386_backend_data *abed;
5458 struct elf_i386_link_hash_entry *eh;
5459 bfd_boolean local_undefweak;
5460 bfd_boolean use_plt_second;
5461
5462 htab = elf_i386_hash_table (info);
5463 if (htab == NULL)
5464 return FALSE;
5465
5466 abed = get_elf_i386_backend_data (output_bfd);
5467 plt_entry_size = htab->plt.plt_entry_size;
5468
5469 /* Use the second PLT section only if there is .plt section. */
5470 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
5471
5472 eh = (struct elf_i386_link_hash_entry *) h;
5473 if (eh->no_finish_dynamic_symbol)
5474 abort ();
5475
5476 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
5477 resolved undefined weak symbols in executable so that their
5478 references have value 0 at run-time. */
5479 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info,
5480 eh->has_got_reloc,
5481 eh);
5482
5483 if (h->plt.offset != (bfd_vma) -1)
5484 {
5485 bfd_vma plt_index, plt_offset;
5486 bfd_vma got_offset;
5487 Elf_Internal_Rela rel;
5488 bfd_byte *loc;
5489 asection *plt, *resolved_plt, *gotplt, *relplt;
5490
5491 /* When building a static executable, use .iplt, .igot.plt and
5492 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5493 if (htab->elf.splt != NULL)
5494 {
5495 plt = htab->elf.splt;
5496 gotplt = htab->elf.sgotplt;
5497 relplt = htab->elf.srelplt;
5498 }
5499 else
5500 {
5501 plt = htab->elf.iplt;
5502 gotplt = htab->elf.igotplt;
5503 relplt = htab->elf.irelplt;
5504 }
5505
5506 /* This symbol has an entry in the procedure linkage table. Set
5507 it up. */
5508
5509 if ((h->dynindx == -1
5510 && !local_undefweak
5511 && !((h->forced_local || bfd_link_executable (info))
5512 && h->def_regular
5513 && h->type == STT_GNU_IFUNC))
5514 || plt == NULL
5515 || gotplt == NULL
5516 || relplt == NULL)
5517 abort ();
5518
5519 /* Get the index in the procedure linkage table which
5520 corresponds to this symbol. This is the index of this symbol
5521 in all the symbols for which we are making plt entries. The
5522 first entry in the procedure linkage table is reserved.
5523
5524 Get the offset into the .got table of the entry that
5525 corresponds to this function. Each .got entry is 4 bytes.
5526 The first three are reserved.
5527
5528 For static executables, we don't reserve anything. */
5529
5530 if (plt == htab->elf.splt)
5531 {
5532 got_offset = (h->plt.offset / plt_entry_size
5533 - htab->plt.has_plt0);
5534 got_offset = (got_offset + 3) * 4;
5535 }
5536 else
5537 {
5538 got_offset = h->plt.offset / plt_entry_size;
5539 got_offset = got_offset * 4;
5540 }
5541
5542 /* Fill in the entry in the procedure linkage table and update
5543 the first slot. */
5544 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
5545 plt_entry_size);
5546
5547 if (use_plt_second)
5548 {
5549 const bfd_byte *plt_entry;
5550 if (bfd_link_pic (info))
5551 plt_entry = htab->non_lazy_plt->pic_plt_entry;
5552 else
5553 plt_entry = htab->non_lazy_plt->plt_entry;
5554 memcpy (htab->plt_second->contents + eh->plt_second.offset,
5555 plt_entry, htab->non_lazy_plt->plt_entry_size);
5556
5557 resolved_plt = htab->plt_second;
5558 plt_offset = eh->plt_second.offset;
5559 }
5560 else
5561 {
5562 resolved_plt = plt;
5563 plt_offset = h->plt.offset;
5564 }
5565
5566 if (! bfd_link_pic (info))
5567 {
5568 bfd_put_32 (output_bfd,
5569 (gotplt->output_section->vma
5570 + gotplt->output_offset
5571 + got_offset),
5572 resolved_plt->contents + plt_offset
5573 + htab->plt.plt_got_offset);
5574
5575 if (abed->os == is_vxworks)
5576 {
5577 int s, k, reloc_index;
5578
5579 /* Create the R_386_32 relocation referencing the GOT
5580 for this PLT entry. */
5581
5582 /* S: Current slot number (zero-based). */
5583 s = ((h->plt.offset - htab->plt.plt_entry_size)
5584 / htab->plt.plt_entry_size);
5585 /* K: Number of relocations for PLTResolve. */
5586 if (bfd_link_pic (info))
5587 k = PLTRESOLVE_RELOCS_SHLIB;
5588 else
5589 k = PLTRESOLVE_RELOCS;
5590 /* Skip the PLTresolve relocations, and the relocations for
5591 the other PLT slots. */
5592 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5593 loc = (htab->srelplt2->contents + reloc_index
5594 * sizeof (Elf32_External_Rel));
5595
5596 rel.r_offset = (plt->output_section->vma
5597 + plt->output_offset
5598 + h->plt.offset + 2),
5599 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5600 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5601
5602 /* Create the R_386_32 relocation referencing the beginning of
5603 the PLT for this GOT entry. */
5604 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5605 + htab->elf.sgotplt->output_offset
5606 + got_offset);
5607 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5608 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5609 loc + sizeof (Elf32_External_Rel));
5610 }
5611 }
5612 else
5613 {
5614 bfd_put_32 (output_bfd, got_offset,
5615 resolved_plt->contents + plt_offset
5616 + htab->plt.plt_got_offset);
5617 }
5618
5619 /* Fill in the entry in the global offset table. Leave the entry
5620 as zero for undefined weak symbol in PIE. No PLT relocation
5621 against undefined weak symbol in PIE. */
5622 if (!local_undefweak)
5623 {
5624 if (htab->plt.has_plt0)
5625 bfd_put_32 (output_bfd,
5626 (plt->output_section->vma
5627 + plt->output_offset
5628 + h->plt.offset
5629 + htab->lazy_plt->plt_lazy_offset),
5630 gotplt->contents + got_offset);
5631
5632 /* Fill in the entry in the .rel.plt section. */
5633 rel.r_offset = (gotplt->output_section->vma
5634 + gotplt->output_offset
5635 + got_offset);
5636 if (h->dynindx == -1
5637 || ((bfd_link_executable (info)
5638 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5639 && h->def_regular
5640 && h->type == STT_GNU_IFUNC))
5641 {
5642 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5643 h->root.root.string,
5644 h->root.u.def.section->owner);
5645
5646 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5647 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5648 in the .got.plt section. */
5649 bfd_put_32 (output_bfd,
5650 (h->root.u.def.value
5651 + h->root.u.def.section->output_section->vma
5652 + h->root.u.def.section->output_offset),
5653 gotplt->contents + got_offset);
5654 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5655 /* R_386_IRELATIVE comes last. */
5656 plt_index = htab->next_irelative_index--;
5657 }
5658 else
5659 {
5660 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5661 plt_index = htab->next_jump_slot_index++;
5662 }
5663
5664 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5665 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5666
5667 /* Don't fill the second and third slots in PLT entry for
5668 static executables nor without PLT0. */
5669 if (plt == htab->elf.splt && htab->plt.has_plt0)
5670 {
5671 bfd_put_32 (output_bfd,
5672 plt_index * sizeof (Elf32_External_Rel),
5673 plt->contents + h->plt.offset
5674 + htab->lazy_plt->plt_reloc_offset);
5675 bfd_put_32 (output_bfd,
5676 - (h->plt.offset
5677 + htab->lazy_plt->plt_plt_offset + 4),
5678 (plt->contents + h->plt.offset
5679 + htab->lazy_plt->plt_plt_offset));
5680 }
5681 }
5682 }
5683 else if (eh->plt_got.offset != (bfd_vma) -1)
5684 {
5685 bfd_vma got_offset, plt_offset;
5686 asection *plt, *got, *gotplt;
5687 const bfd_byte *got_plt_entry;
5688
5689 /* Set the entry in the GOT procedure linkage table. */
5690 plt = htab->plt_got;
5691 got = htab->elf.sgot;
5692 gotplt = htab->elf.sgotplt;
5693 got_offset = h->got.offset;
5694
5695 if (got_offset == (bfd_vma) -1
5696 || plt == NULL
5697 || got == NULL
5698 || gotplt == NULL)
5699 abort ();
5700
5701 /* Fill in the entry in the GOT procedure linkage table. */
5702 if (! bfd_link_pic (info))
5703 {
5704 got_plt_entry = htab->non_lazy_plt->plt_entry;
5705 got_offset += got->output_section->vma + got->output_offset;
5706 }
5707 else
5708 {
5709 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
5710 got_offset += (got->output_section->vma
5711 + got->output_offset
5712 - gotplt->output_section->vma
5713 - gotplt->output_offset);
5714 }
5715
5716 plt_offset = eh->plt_got.offset;
5717 memcpy (plt->contents + plt_offset, got_plt_entry,
5718 htab->non_lazy_plt->plt_entry_size);
5719 bfd_put_32 (output_bfd, got_offset,
5720 (plt->contents + plt_offset
5721 + htab->non_lazy_plt->plt_got_offset));
5722 }
5723
5724 if (!local_undefweak
5725 && !h->def_regular
5726 && (h->plt.offset != (bfd_vma) -1
5727 || eh->plt_got.offset != (bfd_vma) -1))
5728 {
5729 /* Mark the symbol as undefined, rather than as defined in
5730 the .plt section. Leave the value if there were any
5731 relocations where pointer equality matters (this is a clue
5732 for the dynamic linker, to make function pointer
5733 comparisons work between an application and shared
5734 library), otherwise set it to zero. If a function is only
5735 called from a binary, there is no need to slow down
5736 shared libraries because of that. */
5737 sym->st_shndx = SHN_UNDEF;
5738 if (!h->pointer_equality_needed)
5739 sym->st_value = 0;
5740 }
5741
5742 /* Don't generate dynamic GOT relocation against undefined weak
5743 symbol in executable. */
5744 if (h->got.offset != (bfd_vma) -1
5745 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5746 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
5747 && !local_undefweak)
5748 {
5749 Elf_Internal_Rela rel;
5750 asection *relgot = htab->elf.srelgot;
5751
5752 /* This symbol has an entry in the global offset table. Set it
5753 up. */
5754
5755 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5756 abort ();
5757
5758 rel.r_offset = (htab->elf.sgot->output_section->vma
5759 + htab->elf.sgot->output_offset
5760 + (h->got.offset & ~(bfd_vma) 1));
5761
5762 /* If this is a static link, or it is a -Bsymbolic link and the
5763 symbol is defined locally or was forced to be local because
5764 of a version file, we just want to emit a RELATIVE reloc.
5765 The entry in the global offset table will already have been
5766 initialized in the relocate_section function. */
5767 if (h->def_regular
5768 && h->type == STT_GNU_IFUNC)
5769 {
5770 if (h->plt.offset == (bfd_vma) -1)
5771 {
5772 /* STT_GNU_IFUNC is referenced without PLT. */
5773 if (htab->elf.splt == NULL)
5774 {
5775 /* use .rel[a].iplt section to store .got relocations
5776 in static executable. */
5777 relgot = htab->elf.irelplt;
5778 }
5779 if (SYMBOL_REFERENCES_LOCAL (info, h))
5780 {
5781 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
5782 h->root.root.string,
5783 h->root.u.def.section->owner);
5784
5785 bfd_put_32 (output_bfd,
5786 (h->root.u.def.value
5787 + h->root.u.def.section->output_section->vma
5788 + h->root.u.def.section->output_offset),
5789 htab->elf.sgot->contents + h->got.offset);
5790 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5791 }
5792 else
5793 goto do_glob_dat;
5794 }
5795 else if (bfd_link_pic (info))
5796 {
5797 /* Generate R_386_GLOB_DAT. */
5798 goto do_glob_dat;
5799 }
5800 else
5801 {
5802 asection *plt;
5803 bfd_vma plt_offset;
5804
5805 if (!h->pointer_equality_needed)
5806 abort ();
5807
5808 /* For non-shared object, we can't use .got.plt, which
5809 contains the real function addres if we need pointer
5810 equality. We load the GOT entry with the PLT entry. */
5811 if (htab->plt_second != NULL)
5812 {
5813 plt = htab->plt_second;
5814 plt_offset = eh->plt_second.offset;
5815 }
5816 else
5817 {
5818 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5819 plt_offset = h->plt.offset;
5820 }
5821 bfd_put_32 (output_bfd,
5822 (plt->output_section->vma
5823 + plt->output_offset + plt_offset),
5824 htab->elf.sgot->contents + h->got.offset);
5825 return TRUE;
5826 }
5827 }
5828 else if (bfd_link_pic (info)
5829 && SYMBOL_REFERENCES_LOCAL (info, h))
5830 {
5831 BFD_ASSERT((h->got.offset & 1) != 0);
5832 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5833 }
5834 else
5835 {
5836 BFD_ASSERT((h->got.offset & 1) == 0);
5837 do_glob_dat:
5838 bfd_put_32 (output_bfd, (bfd_vma) 0,
5839 htab->elf.sgot->contents + h->got.offset);
5840 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5841 }
5842
5843 elf_append_rel (output_bfd, relgot, &rel);
5844 }
5845
5846 if (h->needs_copy)
5847 {
5848 Elf_Internal_Rela rel;
5849 asection *s;
5850
5851 /* This symbol needs a copy reloc. Set it up. */
5852
5853 if (h->dynindx == -1
5854 || (h->root.type != bfd_link_hash_defined
5855 && h->root.type != bfd_link_hash_defweak)
5856 || htab->elf.srelbss == NULL
5857 || htab->elf.sreldynrelro == NULL)
5858 abort ();
5859
5860 rel.r_offset = (h->root.u.def.value
5861 + h->root.u.def.section->output_section->vma
5862 + h->root.u.def.section->output_offset);
5863 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5864 if (h->root.u.def.section == htab->elf.sdynrelro)
5865 s = htab->elf.sreldynrelro;
5866 else
5867 s = htab->elf.srelbss;
5868 elf_append_rel (output_bfd, s, &rel);
5869 }
5870
5871 return TRUE;
5872 }
5873
5874 /* Finish up local dynamic symbol handling. We set the contents of
5875 various dynamic sections here. */
5876
5877 static bfd_boolean
5878 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5879 {
5880 struct elf_link_hash_entry *h
5881 = (struct elf_link_hash_entry *) *slot;
5882 struct bfd_link_info *info
5883 = (struct bfd_link_info *) inf;
5884
5885 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5886 h, NULL);
5887 }
5888
5889 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
5890 here since undefined weak symbol may not be dynamic and may not be
5891 called for elf_i386_finish_dynamic_symbol. */
5892
5893 static bfd_boolean
5894 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
5895 void *inf)
5896 {
5897 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
5898 struct bfd_link_info *info = (struct bfd_link_info *) inf;
5899
5900 if (h->root.type != bfd_link_hash_undefweak
5901 || h->dynindx != -1)
5902 return TRUE;
5903
5904 return elf_i386_finish_dynamic_symbol (info->output_bfd,
5905 info, h, NULL);
5906 }
5907
5908 /* Used to decide how to sort relocs in an optimal manner for the
5909 dynamic linker, before writing them out. */
5910
5911 static enum elf_reloc_type_class
5912 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5913 const asection *rel_sec ATTRIBUTE_UNUSED,
5914 const Elf_Internal_Rela *rela)
5915 {
5916 bfd *abfd = info->output_bfd;
5917 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5918 struct elf_link_hash_table *htab = elf_hash_table (info);
5919
5920 if (htab->dynsym != NULL
5921 && htab->dynsym->contents != NULL)
5922 {
5923 /* Check relocation against STT_GNU_IFUNC symbol if there are
5924 dynamic symbols. */
5925 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5926 if (r_symndx != STN_UNDEF)
5927 {
5928 Elf_Internal_Sym sym;
5929 if (!bed->s->swap_symbol_in (abfd,
5930 (htab->dynsym->contents
5931 + r_symndx * sizeof (Elf32_External_Sym)),
5932 0, &sym))
5933 abort ();
5934
5935 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5936 return reloc_class_ifunc;
5937 }
5938 }
5939
5940 switch (ELF32_R_TYPE (rela->r_info))
5941 {
5942 case R_386_IRELATIVE:
5943 return reloc_class_ifunc;
5944 case R_386_RELATIVE:
5945 return reloc_class_relative;
5946 case R_386_JUMP_SLOT:
5947 return reloc_class_plt;
5948 case R_386_COPY:
5949 return reloc_class_copy;
5950 default:
5951 return reloc_class_normal;
5952 }
5953 }
5954
5955 /* Finish up the dynamic sections. */
5956
5957 static bfd_boolean
5958 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5959 struct bfd_link_info *info)
5960 {
5961 struct elf_i386_link_hash_table *htab;
5962 bfd *dynobj;
5963 asection *sdyn;
5964 const struct elf_i386_backend_data *abed;
5965
5966 htab = elf_i386_hash_table (info);
5967 if (htab == NULL)
5968 return FALSE;
5969
5970 dynobj = htab->elf.dynobj;
5971 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5972 abed = get_elf_i386_backend_data (output_bfd);
5973
5974 if (htab->elf.dynamic_sections_created)
5975 {
5976 Elf32_External_Dyn *dyncon, *dynconend;
5977
5978 if (sdyn == NULL || htab->elf.sgot == NULL)
5979 abort ();
5980
5981 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5982 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5983 for (; dyncon < dynconend; dyncon++)
5984 {
5985 Elf_Internal_Dyn dyn;
5986 asection *s;
5987
5988 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5989
5990 switch (dyn.d_tag)
5991 {
5992 default:
5993 if (abed->os == is_vxworks
5994 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5995 break;
5996 continue;
5997
5998 case DT_PLTGOT:
5999 s = htab->elf.sgotplt;
6000 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
6001 break;
6002
6003 case DT_JMPREL:
6004 s = htab->elf.srelplt;
6005 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
6006 break;
6007
6008 case DT_PLTRELSZ:
6009 s = htab->elf.srelplt;
6010 dyn.d_un.d_val = s->size;
6011 break;
6012 }
6013
6014 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
6015 }
6016
6017 if (htab->elf.splt && htab->elf.splt->size > 0)
6018 {
6019 /* UnixWare sets the entsize of .plt to 4, although that doesn't
6020 really seem like the right value. */
6021 elf_section_data (htab->elf.splt->output_section)
6022 ->this_hdr.sh_entsize = 4;
6023
6024 if (htab->plt.has_plt0)
6025 {
6026 /* Fill in the special first entry in the procedure linkage
6027 table. */
6028 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
6029 htab->lazy_plt->plt0_entry_size);
6030 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
6031 abed->plt0_pad_byte,
6032 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
6033 if (!bfd_link_pic (info))
6034 {
6035 bfd_put_32 (output_bfd,
6036 (htab->elf.sgotplt->output_section->vma
6037 + htab->elf.sgotplt->output_offset
6038 + 4),
6039 htab->elf.splt->contents
6040 + htab->lazy_plt->plt0_got1_offset);
6041 bfd_put_32 (output_bfd,
6042 (htab->elf.sgotplt->output_section->vma
6043 + htab->elf.sgotplt->output_offset
6044 + 8),
6045 htab->elf.splt->contents
6046 + htab->lazy_plt->plt0_got2_offset);
6047
6048 if (abed->os == is_vxworks)
6049 {
6050 Elf_Internal_Rela rel;
6051 int num_plts = (htab->elf.splt->size
6052 / htab->plt.plt_entry_size) - 1;
6053 unsigned char *p;
6054
6055 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
6056 + 4. On IA32 we use REL relocations so the
6057 addend goes in the PLT directly. */
6058 rel.r_offset = (htab->elf.splt->output_section->vma
6059 + htab->elf.splt->output_offset
6060 + htab->lazy_plt->plt0_got1_offset);
6061 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
6062 R_386_32);
6063 bfd_elf32_swap_reloc_out (output_bfd, &rel,
6064 htab->srelplt2->contents);
6065 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
6066 + 8. */
6067 rel.r_offset = (htab->elf.splt->output_section->vma
6068 + htab->elf.splt->output_offset
6069 + htab->lazy_plt->plt0_got2_offset);
6070 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
6071 R_386_32);
6072 bfd_elf32_swap_reloc_out (output_bfd, &rel,
6073 htab->srelplt2->contents +
6074 sizeof (Elf32_External_Rel));
6075 /* Correct the .rel.plt.unloaded relocations. */
6076 p = htab->srelplt2->contents;
6077 if (bfd_link_pic (info))
6078 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
6079 else
6080 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
6081
6082 for (; num_plts; num_plts--)
6083 {
6084 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
6085 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
6086 R_386_32);
6087 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
6088 p += sizeof (Elf32_External_Rel);
6089
6090 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
6091 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
6092 R_386_32);
6093 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
6094 p += sizeof (Elf32_External_Rel);
6095 }
6096 }
6097 }
6098 }
6099 }
6100
6101 if (htab->plt_got != NULL && htab->plt_got->size > 0)
6102 elf_section_data (htab->plt_got->output_section)
6103 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
6104
6105 if (htab->plt_second != NULL && htab->plt_second->size > 0)
6106 elf_section_data (htab->plt_second->output_section)
6107 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
6108 }
6109
6110 /* Fill in the first three entries in the global offset table. */
6111 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
6112 {
6113 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
6114 {
6115 _bfd_error_handler
6116 (_("discarded output section: `%A'"), htab->elf.sgotplt);
6117 return FALSE;
6118 }
6119
6120 bfd_put_32 (output_bfd,
6121 (sdyn == NULL ? 0
6122 : sdyn->output_section->vma + sdyn->output_offset),
6123 htab->elf.sgotplt->contents);
6124 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
6125 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
6126
6127 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
6128 }
6129
6130 /* Adjust .eh_frame for .plt section. */
6131 if (htab->plt_eh_frame != NULL
6132 && htab->plt_eh_frame->contents != NULL)
6133 {
6134 if (htab->elf.splt != NULL
6135 && htab->elf.splt->size != 0
6136 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
6137 && htab->elf.splt->output_section != NULL
6138 && htab->plt_eh_frame->output_section != NULL)
6139 {
6140 bfd_vma plt_start = htab->elf.splt->output_section->vma;
6141 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
6142 + htab->plt_eh_frame->output_offset
6143 + PLT_FDE_START_OFFSET;
6144 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6145 htab->plt_eh_frame->contents
6146 + PLT_FDE_START_OFFSET);
6147 }
6148 if (htab->plt_eh_frame->sec_info_type
6149 == SEC_INFO_TYPE_EH_FRAME)
6150 {
6151 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6152 htab->plt_eh_frame,
6153 htab->plt_eh_frame->contents))
6154 return FALSE;
6155 }
6156 }
6157
6158 /* Adjust .eh_frame for .plt.got section. */
6159 if (htab->plt_got_eh_frame != NULL
6160 && htab->plt_got_eh_frame->contents != NULL)
6161 {
6162 if (htab->plt_got != NULL
6163 && htab->plt_got->size != 0
6164 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
6165 && htab->plt_got->output_section != NULL
6166 && htab->plt_got_eh_frame->output_section != NULL)
6167 {
6168 bfd_vma plt_start = htab->plt_got->output_section->vma;
6169 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
6170 + htab->plt_got_eh_frame->output_offset
6171 + PLT_FDE_START_OFFSET;
6172 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6173 htab->plt_got_eh_frame->contents
6174 + PLT_FDE_START_OFFSET);
6175 }
6176 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
6177 {
6178 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6179 htab->plt_got_eh_frame,
6180 htab->plt_got_eh_frame->contents))
6181 return FALSE;
6182 }
6183 }
6184
6185 /* Adjust .eh_frame for the second PLT section. */
6186 if (htab->plt_second_eh_frame != NULL
6187 && htab->plt_second_eh_frame->contents != NULL)
6188 {
6189 if (htab->plt_second != NULL
6190 && htab->plt_second->size != 0
6191 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
6192 && htab->plt_second->output_section != NULL
6193 && htab->plt_second_eh_frame->output_section != NULL)
6194 {
6195 bfd_vma plt_start = htab->plt_second->output_section->vma;
6196 bfd_vma eh_frame_start
6197 = (htab->plt_second_eh_frame->output_section->vma
6198 + htab->plt_second_eh_frame->output_offset
6199 + PLT_FDE_START_OFFSET);
6200 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
6201 htab->plt_second_eh_frame->contents
6202 + PLT_FDE_START_OFFSET);
6203 }
6204 if (htab->plt_second_eh_frame->sec_info_type
6205 == SEC_INFO_TYPE_EH_FRAME)
6206 {
6207 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
6208 htab->plt_second_eh_frame,
6209 htab->plt_second_eh_frame->contents))
6210 return FALSE;
6211 }
6212 }
6213
6214 if (htab->elf.sgot && htab->elf.sgot->size > 0)
6215 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
6216
6217 /* Fill PLT entries for undefined weak symbols in PIE. */
6218 if (bfd_link_pie (info))
6219 bfd_hash_traverse (&info->hash->table,
6220 elf_i386_pie_finish_undefweak_symbol,
6221 info);
6222
6223 return TRUE;
6224 }
6225
6226 /* Fill PLT/GOT entries and allocate dynamic relocations for local
6227 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
6228 It has to be done before elf_link_sort_relocs is called so that
6229 dynamic relocations are properly sorted. */
6230
6231 static bfd_boolean
6232 elf_i386_output_arch_local_syms
6233 (bfd *output_bfd ATTRIBUTE_UNUSED,
6234 struct bfd_link_info *info,
6235 void *flaginfo ATTRIBUTE_UNUSED,
6236 int (*func) (void *, const char *,
6237 Elf_Internal_Sym *,
6238 asection *,
6239 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
6240 {
6241 struct elf_i386_link_hash_table *htab = elf_i386_hash_table (info);
6242 if (htab == NULL)
6243 return FALSE;
6244
6245 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
6246 htab_traverse (htab->loc_hash_table,
6247 elf_i386_finish_local_dynamic_symbol,
6248 info);
6249
6250 return TRUE;
6251 }
6252
6253 /* Sort relocs into address order. */
6254
6255 static int
6256 compare_relocs (const void *ap, const void *bp)
6257 {
6258 const arelent *a = * (const arelent **) ap;
6259 const arelent *b = * (const arelent **) bp;
6260
6261 if (a->address > b->address)
6262 return 1;
6263 else if (a->address < b->address)
6264 return -1;
6265 else
6266 return 0;
6267 }
6268
6269 enum elf_i386_plt_type
6270 {
6271 plt_non_lazy = 0,
6272 plt_lazy = 1 << 0,
6273 plt_pic = 1 << 1,
6274 plt_second = 1 << 2,
6275 plt_unknown = -1
6276 };
6277
6278 struct elf_i386_plt
6279 {
6280 const char *name;
6281 asection *sec;
6282 bfd_byte *contents;
6283 enum elf_i386_plt_type type;
6284 unsigned int plt_got_offset;
6285 unsigned int plt_entry_size;
6286 long count;
6287 };
6288
6289 /* Forward declaration. */
6290 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt;
6291
6292 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
6293 dynamic relocations. */
6294
6295 static long
6296 elf_i386_get_synthetic_symtab (bfd *abfd,
6297 long symcount ATTRIBUTE_UNUSED,
6298 asymbol **syms ATTRIBUTE_UNUSED,
6299 long dynsymcount,
6300 asymbol **dynsyms,
6301 asymbol **ret)
6302 {
6303 long size, count, i, n;
6304 int j;
6305 unsigned int plt_got_offset, plt_entry_size;
6306 asymbol *s;
6307 bfd_byte *plt_contents;
6308 long dynrelcount, relsize;
6309 arelent **dynrelbuf;
6310 const struct elf_i386_lazy_plt_layout *lazy_plt;
6311 const struct elf_i386_non_lazy_plt_layout *non_lazy_plt;
6312 const struct elf_i386_lazy_plt_layout *lazy_ibt_plt;
6313 const struct elf_i386_non_lazy_plt_layout *non_lazy_ibt_plt;
6314 asection *plt;
6315 bfd_vma got_addr;
6316 char *names;
6317 enum elf_i386_plt_type plt_type;
6318 struct elf_i386_plt plts[] =
6319 {
6320 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0 },
6321 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0 },
6322 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0 },
6323 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0 }
6324 };
6325
6326 *ret = NULL;
6327
6328 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
6329 return 0;
6330
6331 if (dynsymcount <= 0)
6332 return 0;
6333
6334 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
6335 if (relsize <= 0)
6336 return -1;
6337
6338 dynrelbuf = (arelent **) bfd_malloc (relsize);
6339 if (dynrelbuf == NULL)
6340 return -1;
6341
6342 dynrelcount = bfd_canonicalize_dynamic_reloc (abfd, dynrelbuf,
6343 dynsyms);
6344
6345 /* Sort the relocs by address. */
6346 qsort (dynrelbuf, dynrelcount, sizeof (arelent *), compare_relocs);
6347
6348 non_lazy_plt = NULL;
6349 /* Silence GCC 6. */
6350 lazy_plt = NULL;
6351 non_lazy_ibt_plt = NULL;
6352 lazy_ibt_plt = NULL;
6353 switch (get_elf_i386_backend_data (abfd)->os)
6354 {
6355 case is_normal:
6356 non_lazy_plt = &elf_i386_non_lazy_plt;
6357 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
6358 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
6359 /* Fall through */
6360 case is_vxworks:
6361 lazy_plt = &elf_i386_lazy_plt;
6362 break;
6363 case is_nacl:
6364 lazy_plt = &elf_i386_nacl_plt;
6365 break;
6366 }
6367
6368 got_addr = 0;
6369
6370 count = 0;
6371 for (j = 0; plts[j].name != NULL; j++)
6372 {
6373 plt = bfd_get_section_by_name (abfd, plts[j].name);
6374 if (plt == NULL)
6375 continue;
6376
6377 /* Get the PLT section contents. */
6378 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
6379 if (plt_contents == NULL)
6380 break;
6381 if (!bfd_get_section_contents (abfd, (asection *) plt,
6382 plt_contents, 0, plt->size))
6383 {
6384 free (plt_contents);
6385 break;
6386 }
6387
6388 /* Check what kind of PLT it is. */
6389 plt_type = plt_unknown;
6390 if (plts[j].type == plt_unknown)
6391 {
6392 /* Match lazy PLT first. */
6393 if (memcmp (plt_contents, lazy_plt->plt0_entry,
6394 lazy_plt->plt0_got1_offset) == 0)
6395 {
6396 /* The fist entry in the lazy IBT PLT is the same as the
6397 normal lazy PLT. */
6398 if (lazy_ibt_plt != NULL
6399 && (memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
6400 lazy_ibt_plt->plt_entry,
6401 lazy_ibt_plt->plt_got_offset) == 0))
6402 plt_type = plt_lazy | plt_second;
6403 else
6404 plt_type = plt_lazy;
6405 }
6406 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
6407 lazy_plt->plt0_got1_offset) == 0)
6408 {
6409 /* The fist entry in the PIC lazy IBT PLT is the same as
6410 the normal PIC lazy PLT. */
6411 if (lazy_ibt_plt != NULL
6412 && (memcmp (plt_contents + lazy_ibt_plt->plt_entry_size,
6413 lazy_ibt_plt->pic_plt_entry,
6414 lazy_ibt_plt->plt_got_offset) == 0))
6415 plt_type = plt_lazy | plt_pic | plt_second;
6416 else
6417 plt_type = plt_lazy | plt_pic;
6418 }
6419 }
6420
6421 if (non_lazy_plt != NULL
6422 && (plt_type == plt_unknown || plt_type == plt_non_lazy))
6423 {
6424 /* Match non-lazy PLT. */
6425 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
6426 non_lazy_plt->plt_got_offset) == 0)
6427 plt_type = plt_non_lazy;
6428 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
6429 non_lazy_plt->plt_got_offset) == 0)
6430 plt_type = plt_pic;
6431 }
6432
6433 if ((non_lazy_ibt_plt != NULL)
6434 && (plt_type == plt_unknown || plt_type == plt_second))
6435 {
6436 if (memcmp (plt_contents,
6437 non_lazy_ibt_plt->plt_entry,
6438 non_lazy_ibt_plt->plt_got_offset) == 0)
6439 {
6440 /* Match IBT PLT. */
6441 plt_type = plt_second;
6442 non_lazy_plt = non_lazy_ibt_plt;
6443 }
6444 else if (memcmp (plt_contents,
6445 non_lazy_ibt_plt->pic_plt_entry,
6446 non_lazy_ibt_plt->plt_got_offset) == 0)
6447 {
6448 /* Match PIC IBT PLT. */
6449 plt_type = plt_second | plt_pic;
6450 non_lazy_plt = non_lazy_ibt_plt;
6451 }
6452 }
6453
6454 if (plt_type == plt_unknown)
6455 continue;
6456
6457 plts[j].sec = plt;
6458 plts[j].type = plt_type;
6459
6460 if ((plt_type & plt_lazy))
6461 {
6462 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
6463 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
6464 /* Skip PLT0 in lazy PLT. */
6465 i = 1;
6466 }
6467 else
6468 {
6469 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
6470 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
6471 i = 0;
6472 }
6473
6474 /* Skip lazy PLT when the second PLT is used. */
6475 if ((plt_type & (plt_lazy | plt_second))
6476 == (plt_lazy | plt_second))
6477 plts[j].count = 0;
6478 else
6479 {
6480 n = plt->size / plts[j].plt_entry_size;
6481 plts[j].count = n;
6482 count += n - i;
6483 }
6484
6485 plts[j].contents = plt_contents;
6486
6487 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
6488 if ((plt_type & plt_pic))
6489 got_addr = (bfd_vma) -1;
6490 }
6491
6492 size = count * sizeof (asymbol);
6493 s = *ret = (asymbol *) bfd_zmalloc (size);
6494 if (s == NULL)
6495 {
6496 bad_return:
6497 for (j = 0; plts[j].name != NULL; j++)
6498 if (plts[j].contents != NULL)
6499 free (plts[j].contents);
6500 free (dynrelbuf);
6501 return -1;
6502 }
6503
6504 if (got_addr)
6505 {
6506 /* Check .got.plt and then .got to get the _GLOBAL_OFFSET_TABLE_
6507 address. */
6508 asection *sec = bfd_get_section_by_name (abfd, ".got.plt");
6509 if (sec != NULL)
6510 got_addr = sec->vma;
6511 else
6512 {
6513 sec = bfd_get_section_by_name (abfd, ".got");
6514 if (sec != NULL)
6515 got_addr = sec->vma;
6516 }
6517
6518 if (got_addr == (bfd_vma) -1)
6519 goto bad_return;
6520 }
6521
6522 /* Check for each PLT section. */
6523 size = 0;
6524 n = 0;
6525 for (j = 0; plts[j].name != NULL; j++)
6526 if ((plt_contents = plts[j].contents) != NULL)
6527 {
6528 long k;
6529 bfd_vma offset;
6530
6531 plt_got_offset = plts[j].plt_got_offset;
6532 plt_entry_size = plts[j].plt_entry_size;
6533
6534 plt = plts[j].sec;
6535
6536 if ((plts[j].type & plt_lazy))
6537 {
6538 /* Skip PLT0 in lazy PLT. */
6539 k = 1;
6540 offset = plt_entry_size;
6541 }
6542 else
6543 {
6544 k = 0;
6545 offset = 0;
6546 }
6547
6548 /* Check each PLT entry against dynamic relocations. */
6549 for (; k < plts[j].count; k++)
6550 {
6551 int off;
6552 bfd_vma got_vma;
6553 long min, max, mid;
6554 arelent *p;
6555
6556 /* Get the GOT offset, a signed 32-bit integer. */
6557 off = H_GET_32 (abfd, (plt_contents + offset
6558 + plt_got_offset));
6559 got_vma = got_addr + off;
6560
6561 /* Binary search. */
6562 p = dynrelbuf[0];
6563 min = 0;
6564 max = dynrelcount;
6565 while ((min + 1) < max)
6566 {
6567 arelent *r;
6568
6569 mid = (min + max) / 2;
6570 r = dynrelbuf[mid];
6571 if (got_vma > r->address)
6572 min = mid;
6573 else if (got_vma < r->address)
6574 max = mid;
6575 else
6576 {
6577 p = r;
6578 break;
6579 }
6580 }
6581
6582 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
6583 if (got_vma == p->address
6584 && p->howto != NULL
6585 && (p->howto->type == R_386_JUMP_SLOT
6586 || p->howto->type == R_386_GLOB_DAT
6587 || p->howto->type == R_386_IRELATIVE))
6588 {
6589 *s = **p->sym_ptr_ptr;
6590 /* Undefined syms won't have BSF_LOCAL or BSF_GLOBAL
6591 set. Since we are defining a symbol, ensure one
6592 of them is set. */
6593 if ((s->flags & BSF_LOCAL) == 0)
6594 s->flags |= BSF_GLOBAL;
6595 s->flags |= BSF_SYNTHETIC;
6596 /* This is no longer a section symbol. */
6597 s->flags &= ~BSF_SECTION_SYM;
6598 s->section = plt;
6599 s->the_bfd = plt->owner;
6600 s->value = offset;
6601 /* Store relocation for later use. */
6602 s->udata.p = p;
6603 /* Add @plt to function name later. */
6604 size += strlen (s->name) + sizeof ("@plt");
6605 if (p->addend != 0)
6606 size += sizeof ("+0x") - 1 + 8;
6607 n++;
6608 s++;
6609 }
6610 offset += plt_entry_size;
6611 }
6612 }
6613
6614 /* PLT entries with R_386_TLS_DESC relocations are skipped. */
6615 if (n == 0)
6616 goto bad_return;
6617
6618 count = n;
6619
6620 /* Allocate space for @plt suffixes. */
6621 names = (char *) bfd_malloc (size);
6622 if (s == NULL)
6623 goto bad_return;
6624
6625 s = *ret;
6626 for (i = 0; i < count; i++)
6627 {
6628 /* Add @plt to function name. */
6629 arelent *p = (arelent *) s->udata.p;
6630 /* Clear it now. */
6631 s->udata.p = NULL;
6632 size = strlen (s->name);
6633 memcpy (names, s->name, size);
6634 s->name = names;
6635 names += size;
6636 if (p->addend != 0)
6637 {
6638 char buf[30], *a;
6639
6640 memcpy (names, "+0x", sizeof ("+0x") - 1);
6641 names += sizeof ("+0x") - 1;
6642 bfd_sprintf_vma (abfd, buf, p->addend);
6643 for (a = buf; *a == '0'; ++a)
6644 ;
6645 size = strlen (a);
6646 memcpy (names, a, size);
6647 names += size;
6648 }
6649 memcpy (names, "@plt", sizeof ("@plt"));
6650 names += sizeof ("@plt");
6651 s++;
6652 }
6653
6654 for (j = 0; plts[j].name != NULL; j++)
6655 if (plts[j].contents != NULL)
6656 free (plts[j].contents);
6657
6658 free (dynrelbuf);
6659
6660 return count;
6661 }
6662
6663 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
6664
6665 static bfd_boolean
6666 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
6667 {
6668 if (h->plt.offset != (bfd_vma) -1
6669 && !h->def_regular
6670 && !h->pointer_equality_needed)
6671 return FALSE;
6672
6673 return _bfd_elf_hash_symbol (h);
6674 }
6675
6676 /* Parse i386 GNU properties. */
6677
6678 static enum elf_property_kind
6679 elf_i386_parse_gnu_properties (bfd *abfd, unsigned int type,
6680 bfd_byte *ptr, unsigned int datasz)
6681 {
6682 elf_property *prop;
6683
6684 switch (type)
6685 {
6686 case GNU_PROPERTY_X86_ISA_1_USED:
6687 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6688 case GNU_PROPERTY_X86_FEATURE_1_AND:
6689 if (datasz != 4)
6690 {
6691 _bfd_error_handler
6692 ((type == GNU_PROPERTY_X86_ISA_1_USED
6693 ? _("error: %B: <corrupt x86 ISA used size: 0x%x>")
6694 : (type == GNU_PROPERTY_X86_ISA_1_NEEDED
6695 ? _("error: %B: <corrupt x86 ISA needed size: 0x%x>")
6696 : _("error: %B: <corrupt x86 feature size: 0x%x>"))),
6697 abfd, datasz);
6698 return property_corrupt;
6699 }
6700 prop = _bfd_elf_get_property (abfd, type, datasz);
6701 /* Combine properties of the same type. */
6702 prop->u.number |= bfd_h_get_32 (abfd, ptr);
6703 prop->pr_kind = property_number;
6704 break;
6705
6706 default:
6707 return property_ignored;
6708 }
6709
6710 return property_number;
6711 }
6712
6713 /* Merge i386 GNU property BPROP with APROP. If APROP isn't NULL,
6714 return TRUE if APROP is updated. Otherwise, return TRUE if BPROP
6715 should be merged with ABFD. */
6716
6717 static bfd_boolean
6718 elf_i386_merge_gnu_properties (struct bfd_link_info *info,
6719 bfd *abfd ATTRIBUTE_UNUSED,
6720 elf_property *aprop,
6721 elf_property *bprop)
6722 {
6723 unsigned int number, features;
6724 bfd_boolean updated = FALSE;
6725 unsigned int pr_type = aprop != NULL ? aprop->pr_type : bprop->pr_type;
6726
6727 switch (pr_type)
6728 {
6729 case GNU_PROPERTY_X86_ISA_1_USED:
6730 case GNU_PROPERTY_X86_ISA_1_NEEDED:
6731 if (aprop != NULL && bprop != NULL)
6732 {
6733 number = aprop->u.number;
6734 aprop->u.number = number | bprop->u.number;
6735 updated = number != (unsigned int) aprop->u.number;
6736 }
6737 else
6738 {
6739 /* Return TRUE if APROP is NULL to indicate that BPROP should
6740 be added to ABFD. */
6741 updated = aprop == NULL;
6742 }
6743 break;
6744
6745 case GNU_PROPERTY_X86_FEATURE_1_AND:
6746 /* Only one of APROP and BPROP can be NULL:
6747 1. APROP & BPROP when both APROP and BPROP aren't NULL.
6748 2. If APROP is NULL, remove x86 feature.
6749 3. Otherwise, do nothing.
6750 */
6751 if (aprop != NULL && bprop != NULL)
6752 {
6753 features = 0;
6754 if (info->ibt)
6755 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
6756 if (info->shstk)
6757 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
6758 number = aprop->u.number;
6759 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
6760 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6761 aprop->u.number = (number & bprop->u.number) | features;
6762 updated = number != (unsigned int) aprop->u.number;
6763 /* Remove the property if all feature bits are cleared. */
6764 if (aprop->u.number == 0)
6765 aprop->pr_kind = property_remove;
6766 }
6767 else
6768 {
6769 features = 0;
6770 if (info->ibt)
6771 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
6772 if (info->shstk)
6773 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
6774 if (features)
6775 {
6776 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
6777 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6778 if (aprop != NULL)
6779 {
6780 number = aprop->u.number;
6781 aprop->u.number = number | features;
6782 updated = number != (unsigned int) aprop->u.number;
6783 }
6784 else
6785 {
6786 bprop->u.number |= features;
6787 updated = TRUE;
6788 }
6789 }
6790 else if (aprop != NULL)
6791 {
6792 aprop->pr_kind = property_remove;
6793 updated = TRUE;
6794 }
6795 }
6796 break;
6797
6798 default:
6799 /* Never should happen. */
6800 abort ();
6801 }
6802
6803 return updated;
6804 }
6805
6806 /* Set up i386 GNU properties. Return the first relocatable ELF input
6807 with GNU properties if found. Otherwise, return NULL. */
6808
6809 static bfd *
6810 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
6811 {
6812 bfd_boolean normal_target;
6813 bfd_boolean lazy_plt;
6814 asection *sec, *pltsec;
6815 bfd *dynobj;
6816 bfd_boolean use_ibt_plt;
6817 unsigned int plt_alignment, features;
6818 struct elf_i386_link_hash_table *htab;
6819 bfd *pbfd;
6820
6821 features = 0;
6822 if (info->ibt)
6823 features = GNU_PROPERTY_X86_FEATURE_1_IBT;
6824 if (info->shstk)
6825 features |= GNU_PROPERTY_X86_FEATURE_1_SHSTK;
6826 if (features)
6827 {
6828 /* Turn on GNU_PROPERTY_X86_FEATURE_1_IBT and
6829 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6830 bfd *ebfd = NULL;
6831 elf_property *prop;
6832
6833 for (pbfd = info->input_bfds;
6834 pbfd != NULL;
6835 pbfd = pbfd->link.next)
6836 if (bfd_get_flavour (pbfd) == bfd_target_elf_flavour
6837 && bfd_count_sections (pbfd) != 0)
6838 {
6839 ebfd = pbfd;
6840
6841 if (elf_properties (pbfd) != NULL)
6842 {
6843 /* Find a normal input file with GNU property note. */
6844 prop = _bfd_elf_get_property (pbfd,
6845 GNU_PROPERTY_X86_FEATURE_1_AND,
6846 4);
6847 /* Add GNU_PROPERTY_X86_FEATURE_1_IBT and
6848 GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
6849 prop->u.number |= features;
6850 prop->pr_kind = property_number;
6851 break;
6852 }
6853 }
6854
6855 if (pbfd == NULL && ebfd != NULL)
6856 {
6857 /* Create GNU_PROPERTY_X86_FEATURE_1_IBT if needed. */
6858 prop = _bfd_elf_get_property (ebfd,
6859 GNU_PROPERTY_X86_FEATURE_1_AND,
6860 4);
6861 prop->u.number = features;
6862 prop->pr_kind = property_number;
6863
6864 sec = bfd_make_section_with_flags (ebfd,
6865 NOTE_GNU_PROPERTY_SECTION_NAME,
6866 (SEC_ALLOC
6867 | SEC_LOAD
6868 | SEC_IN_MEMORY
6869 | SEC_READONLY
6870 | SEC_HAS_CONTENTS
6871 | SEC_DATA));
6872 if (sec == NULL)
6873 info->callbacks->einfo (_("%F: failed to create GNU property section\n"));
6874
6875 if (!bfd_set_section_alignment (ebfd, sec, 2))
6876 goto error_alignment;
6877
6878 elf_section_type (sec) = SHT_NOTE;
6879 }
6880 }
6881
6882 pbfd = _bfd_elf_link_setup_gnu_properties (info);
6883
6884 if (bfd_link_relocatable (info))
6885 return pbfd;
6886
6887 htab = elf_i386_hash_table (info);
6888 if (htab == NULL)
6889 return pbfd;
6890
6891 use_ibt_plt = info->ibtplt || info->ibt;
6892 if (!use_ibt_plt && pbfd != NULL)
6893 {
6894 /* Check if GNU_PROPERTY_X86_FEATURE_1_IBT is on. */
6895 elf_property_list *p;
6896
6897 /* The property list is sorted in order of type. */
6898 for (p = elf_properties (pbfd); p; p = p->next)
6899 {
6900 if (GNU_PROPERTY_X86_FEATURE_1_AND == p->property.pr_type)
6901 {
6902 use_ibt_plt = !!(p->property.u.number
6903 & GNU_PROPERTY_X86_FEATURE_1_IBT);
6904 break;
6905 }
6906 else if (GNU_PROPERTY_X86_FEATURE_1_AND < p->property.pr_type)
6907 break;
6908 }
6909 }
6910
6911 dynobj = htab->elf.dynobj;
6912
6913 /* Set htab->elf.dynobj here so that there is no need to check and
6914 set it in check_relocs. */
6915 if (dynobj == NULL)
6916 {
6917 bfd *abfd;
6918
6919 /* Find a normal input file to hold linker created
6920 sections. */
6921 for (abfd = info->input_bfds;
6922 abfd != NULL;
6923 abfd = abfd->link.next)
6924 if ((abfd->flags
6925 & (DYNAMIC | BFD_LINKER_CREATED | BFD_PLUGIN)) == 0)
6926 {
6927 htab->elf.dynobj = abfd;
6928 dynobj = abfd;
6929 break;
6930 }
6931 }
6932
6933 /* Even when lazy binding is disabled by "-z now", the PLT0 entry may
6934 still be used with LD_AUDIT or LD_PROFILE if PLT entry is used for
6935 canonical function address. */
6936 htab->plt.has_plt0 = 1;
6937 normal_target = FALSE;
6938
6939 switch (get_elf_i386_backend_data (info->output_bfd)->os)
6940 {
6941 case is_normal:
6942 if (use_ibt_plt)
6943 {
6944 htab->lazy_plt = &elf_i386_lazy_ibt_plt;
6945 htab->non_lazy_plt = &elf_i386_non_lazy_ibt_plt;
6946 }
6947 else
6948 {
6949 htab->lazy_plt = &elf_i386_lazy_plt;
6950 htab->non_lazy_plt = &elf_i386_non_lazy_plt;
6951 }
6952 normal_target = TRUE;
6953 break;
6954 case is_vxworks:
6955 htab->lazy_plt = &elf_i386_lazy_plt;
6956 htab->non_lazy_plt = NULL;
6957 if (!elf_vxworks_create_dynamic_sections (dynobj, info,
6958 &htab->srelplt2))
6959 info->callbacks->einfo (_("%F: failed to create VxWorks dynamic sections\n"));
6960 break;
6961 case is_nacl:
6962 htab->lazy_plt = &elf_i386_nacl_plt;
6963 htab->non_lazy_plt = NULL;
6964 break;
6965 }
6966
6967 pltsec = htab->elf.splt;
6968
6969 /* If the non-lazy PLT is available, use it for all PLT entries if
6970 there are no PLT0 or no .plt section. */
6971 if (htab->non_lazy_plt != NULL
6972 && (!htab->plt.has_plt0 || pltsec == NULL))
6973 {
6974 lazy_plt = FALSE;
6975 if (bfd_link_pic (info))
6976 htab->plt.plt_entry
6977 = htab->non_lazy_plt->pic_plt_entry;
6978 else
6979 htab->plt.plt_entry
6980 = htab->non_lazy_plt->plt_entry;
6981 htab->plt.plt_entry_size
6982 = htab->non_lazy_plt->plt_entry_size;
6983 htab->plt.plt_got_offset
6984 = htab->non_lazy_plt->plt_got_offset;
6985 htab->plt.eh_frame_plt_size
6986 = htab->non_lazy_plt->eh_frame_plt_size;
6987 htab->plt.eh_frame_plt
6988 = htab->non_lazy_plt->eh_frame_plt;
6989 }
6990 else
6991 {
6992 lazy_plt = TRUE;
6993 if (bfd_link_pic (info))
6994 {
6995 htab->plt.plt0_entry
6996 = htab->lazy_plt->pic_plt0_entry;
6997 htab->plt.plt_entry
6998 = htab->lazy_plt->pic_plt_entry;
6999 }
7000 else
7001 {
7002 htab->plt.plt0_entry
7003 = htab->lazy_plt->plt0_entry;
7004 htab->plt.plt_entry
7005 = htab->lazy_plt->plt_entry;
7006 }
7007 htab->plt.plt_entry_size
7008 = htab->lazy_plt->plt_entry_size;
7009 htab->plt.plt_got_offset
7010 = htab->lazy_plt->plt_got_offset;
7011 htab->plt.eh_frame_plt_size
7012 = htab->lazy_plt->eh_frame_plt_size;
7013 htab->plt.eh_frame_plt
7014 = htab->lazy_plt->eh_frame_plt;
7015 }
7016
7017 /* Return if there are no normal input files. */
7018 if (dynobj == NULL)
7019 return pbfd;
7020
7021 /* Since create_dynamic_sections isn't always called, but GOT
7022 relocations need GOT relocations, create them here so that we
7023 don't need to do it in check_relocs. */
7024 if (htab->elf.sgot == NULL
7025 && !_bfd_elf_create_got_section (dynobj, info))
7026 info->callbacks->einfo (_("%F: failed to create GOT sections\n"));
7027
7028 /* Create the ifunc sections here so that check_relocs can be
7029 simplified. */
7030 if (!_bfd_elf_create_ifunc_sections (dynobj, info))
7031 info->callbacks->einfo (_("%F: failed to create ifunc sections\n"));
7032
7033 plt_alignment = bfd_log2 (htab->plt.plt_entry_size);
7034
7035 if (pltsec != NULL)
7036 {
7037 /* Whe creating executable, set the contents of the .interp
7038 section to the interpreter. */
7039 if (bfd_link_executable (info) && !info->nointerp)
7040 {
7041 asection *s = bfd_get_linker_section (dynobj, ".interp");
7042 if (s == NULL)
7043 abort ();
7044 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
7045 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
7046 htab->interp = s;
7047 }
7048
7049 /* Don't change PLT section alignment for NaCl since it uses
7050 64-byte PLT entry and sets PLT section alignment to 32
7051 bytes. */
7052 if (normal_target)
7053 {
7054 const struct elf_backend_data *bed
7055 = get_elf_backend_data (dynobj);
7056 flagword pltflags = (bed->dynamic_sec_flags
7057 | SEC_ALLOC
7058 | SEC_CODE
7059 | SEC_LOAD
7060 | SEC_READONLY);
7061 unsigned int non_lazy_plt_alignment
7062 = bfd_log2 (htab->non_lazy_plt->plt_entry_size);
7063
7064 sec = pltsec;
7065 if (!bfd_set_section_alignment (sec->owner, sec,
7066 plt_alignment))
7067 goto error_alignment;
7068
7069 /* Create the GOT procedure linkage table. */
7070 sec = bfd_make_section_anyway_with_flags (dynobj,
7071 ".plt.got",
7072 pltflags);
7073 if (sec == NULL)
7074 info->callbacks->einfo (_("%F: failed to create GOT PLT section\n"));
7075
7076 if (!bfd_set_section_alignment (dynobj, sec,
7077 non_lazy_plt_alignment))
7078 goto error_alignment;
7079
7080 htab->plt_got = sec;
7081
7082 if (lazy_plt)
7083 {
7084 sec = NULL;
7085
7086 if (use_ibt_plt)
7087 {
7088 /* Create the second PLT for Intel IBT support. IBT
7089 PLT is supported only for non-NaCl target and is
7090 is needed only for lazy binding. */
7091 sec = bfd_make_section_anyway_with_flags (dynobj,
7092 ".plt.sec",
7093 pltflags);
7094 if (sec == NULL)
7095 info->callbacks->einfo (_("%F: failed to create IBT-enabled PLT section\n"));
7096
7097 if (!bfd_set_section_alignment (dynobj, sec,
7098 plt_alignment))
7099 goto error_alignment;
7100 }
7101
7102 htab->plt_second = sec;
7103 }
7104 }
7105
7106 if (!info->no_ld_generated_unwind_info)
7107 {
7108 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
7109 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
7110 | SEC_LINKER_CREATED);
7111
7112 sec = bfd_make_section_anyway_with_flags (dynobj,
7113 ".eh_frame",
7114 flags);
7115 if (sec == NULL)
7116 info->callbacks->einfo (_("%F: failed to create PLT .eh_frame section\n"));
7117
7118 if (!bfd_set_section_alignment (dynobj, sec, 2))
7119 goto error_alignment;
7120
7121 htab->plt_eh_frame = sec;
7122
7123 if (htab->plt_got != NULL)
7124 {
7125 sec = bfd_make_section_anyway_with_flags (dynobj,
7126 ".eh_frame",
7127 flags);
7128 if (sec == NULL)
7129 info->callbacks->einfo (_("%F: failed to create GOT PLT .eh_frame section\n"));
7130
7131 if (!bfd_set_section_alignment (dynobj, sec, 2))
7132 goto error_alignment;
7133
7134 htab->plt_got_eh_frame = sec;
7135 }
7136 }
7137 }
7138
7139 if (normal_target)
7140 {
7141 /* The .iplt section is used for IFUNC symbols in static
7142 executables. */
7143 sec = htab->elf.iplt;
7144 if (sec != NULL
7145 && !bfd_set_section_alignment (sec->owner, sec,
7146 plt_alignment))
7147 {
7148 error_alignment:
7149 info->callbacks->einfo (_("%F%A: failed to align section\n"),
7150 sec);
7151 }
7152 }
7153
7154 return pbfd;
7155 }
7156
7157 #define TARGET_LITTLE_SYM i386_elf32_vec
7158 #define TARGET_LITTLE_NAME "elf32-i386"
7159 #define ELF_ARCH bfd_arch_i386
7160 #define ELF_TARGET_ID I386_ELF_DATA
7161 #define ELF_MACHINE_CODE EM_386
7162 #define ELF_MAXPAGESIZE 0x1000
7163
7164 #define elf_backend_can_gc_sections 1
7165 #define elf_backend_can_refcount 1
7166 #define elf_backend_want_got_plt 1
7167 #define elf_backend_plt_readonly 1
7168 #define elf_backend_want_plt_sym 0
7169 #define elf_backend_got_header_size 12
7170 #define elf_backend_plt_alignment 4
7171 #define elf_backend_dtrel_excludes_plt 1
7172 #define elf_backend_extern_protected_data 1
7173 #define elf_backend_caches_rawsize 1
7174 #define elf_backend_want_dynrelro 1
7175
7176 /* Support RELA for objdump of prelink objects. */
7177 #define elf_info_to_howto elf_i386_info_to_howto_rel
7178 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
7179
7180 #define bfd_elf32_mkobject elf_i386_mkobject
7181
7182 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
7183 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
7184 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
7185 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
7186 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
7187
7188 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
7189 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
7190 #define elf_backend_check_relocs elf_i386_check_relocs
7191 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
7192 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
7193 #define elf_backend_fake_sections elf_i386_fake_sections
7194 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
7195 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
7196 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
7197 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
7198 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
7199 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
7200 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
7201 #define elf_backend_relocate_section elf_i386_relocate_section
7202 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
7203 #define elf_backend_always_size_sections elf_i386_always_size_sections
7204 #define elf_backend_omit_section_dynsym \
7205 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
7206 #define elf_backend_hash_symbol elf_i386_hash_symbol
7207 #define elf_backend_fixup_symbol elf_i386_fixup_symbol
7208 #define elf_backend_parse_gnu_properties elf_i386_parse_gnu_properties
7209 #define elf_backend_merge_gnu_properties elf_i386_merge_gnu_properties
7210 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
7211
7212 #include "elf32-target.h"
7213
7214 /* FreeBSD support. */
7215
7216 #undef TARGET_LITTLE_SYM
7217 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
7218 #undef TARGET_LITTLE_NAME
7219 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
7220 #undef ELF_OSABI
7221 #define ELF_OSABI ELFOSABI_FREEBSD
7222
7223 /* The kernel recognizes executables as valid only if they carry a
7224 "FreeBSD" label in the ELF header. So we put this label on all
7225 executables and (for simplicity) also all other object files. */
7226
7227 static void
7228 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
7229 {
7230 _bfd_elf_post_process_headers (abfd, info);
7231
7232 #ifdef OLD_FREEBSD_ABI_LABEL
7233 {
7234 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
7235 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
7236 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
7237 }
7238 #endif
7239 }
7240
7241 #undef elf_backend_post_process_headers
7242 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
7243 #undef elf32_bed
7244 #define elf32_bed elf32_i386_fbsd_bed
7245
7246 #undef elf_backend_add_symbol_hook
7247
7248 #include "elf32-target.h"
7249
7250 /* Solaris 2. */
7251
7252 #undef TARGET_LITTLE_SYM
7253 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
7254 #undef TARGET_LITTLE_NAME
7255 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
7256
7257 #undef elf_backend_post_process_headers
7258
7259 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
7260 objects won't be recognized. */
7261 #undef ELF_OSABI
7262
7263 #undef elf32_bed
7264 #define elf32_bed elf32_i386_sol2_bed
7265
7266 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
7267 boundary. */
7268 #undef elf_backend_static_tls_alignment
7269 #define elf_backend_static_tls_alignment 8
7270
7271 /* The Solaris 2 ABI requires a plt symbol on all platforms.
7272
7273 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
7274 File, p.63. */
7275 #undef elf_backend_want_plt_sym
7276 #define elf_backend_want_plt_sym 1
7277
7278 #undef elf_backend_strtab_flags
7279 #define elf_backend_strtab_flags SHF_STRINGS
7280
7281 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
7282 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
7283 FALSE otherwise. ISECTION is the best guess matching section from the
7284 input bfd IBFD, but it might be NULL. */
7285
7286 static bfd_boolean
7287 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
7288 bfd *obfd ATTRIBUTE_UNUSED,
7289 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
7290 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
7291 {
7292 /* PR 19938: FIXME: Need to add code for setting the sh_info
7293 and sh_link fields of Solaris specific section types. */
7294 return FALSE;
7295
7296 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
7297 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
7298
7299 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
7300
7301 The following values should be set:
7302
7303 Type Link Info
7304 -----------------------------------------------------------------------------
7305 SHT_SUNW_ancillary The section header index of 0
7306 [0x6fffffee] the associated string table.
7307
7308 SHT_SUNW_capinfo The section header index of For a dynamic object, the
7309 [0x6ffffff0] the associated symbol table. section header index of
7310 the associated
7311 SHT_SUNW_capchain table,
7312 otherwise 0.
7313
7314 SHT_SUNW_symsort The section header index of 0
7315 [0x6ffffff1] the associated symbol table.
7316
7317 SHT_SUNW_tlssort The section header index of 0
7318 [0x6ffffff2] the associated symbol table.
7319
7320 SHT_SUNW_LDYNSYM The section header index of One greater than the
7321 [0x6ffffff3] the associated string table. symbol table index of the
7322 This index is the same string last local symbol,
7323 table used by the SHT_DYNSYM STB_LOCAL. Since
7324 section. SHT_SUNW_LDYNSYM only
7325 contains local symbols,
7326 sh_info is equivalent to
7327 the number of symbols in
7328 the table.
7329
7330 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
7331 [0x6ffffff5] the section header index of to named strings, the
7332 the associated section header index of
7333 SHT_SUNW_capinfo table, the associated string
7334 otherwise 0. table, otherwise 0.
7335
7336 SHT_SUNW_move The section header index of 0
7337 [0x6ffffffa] the associated symbol table.
7338
7339 SHT_SUNW_COMDAT 0 0
7340 [0x6ffffffb]
7341
7342 SHT_SUNW_syminfo The section header index of The section header index
7343 [0x6ffffffc] the associated symbol table. of the associated
7344 .dynamic section.
7345
7346 SHT_SUNW_verdef The section header index of The number of version
7347 [0x6ffffffd] the associated string table. definitions within the
7348 section.
7349
7350 SHT_SUNW_verneed The section header index of The number of version
7351 [0x6ffffffe] the associated string table. dependencies within the
7352 section.
7353
7354 SHT_SUNW_versym The section header index of 0
7355 [0x6fffffff] the associated symbol table. */
7356 }
7357
7358 #undef elf_backend_copy_special_section_fields
7359 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
7360
7361 #include "elf32-target.h"
7362
7363 /* Intel MCU support. */
7364
7365 static bfd_boolean
7366 elf32_iamcu_elf_object_p (bfd *abfd)
7367 {
7368 /* Set the right machine number for an IAMCU elf32 file. */
7369 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
7370 return TRUE;
7371 }
7372
7373 #undef TARGET_LITTLE_SYM
7374 #define TARGET_LITTLE_SYM iamcu_elf32_vec
7375 #undef TARGET_LITTLE_NAME
7376 #define TARGET_LITTLE_NAME "elf32-iamcu"
7377 #undef ELF_ARCH
7378 #define ELF_ARCH bfd_arch_iamcu
7379
7380 #undef ELF_MACHINE_CODE
7381 #define ELF_MACHINE_CODE EM_IAMCU
7382
7383 #undef ELF_OSABI
7384
7385 #undef elf32_bed
7386 #define elf32_bed elf32_iamcu_bed
7387
7388 #undef elf_backend_object_p
7389 #define elf_backend_object_p elf32_iamcu_elf_object_p
7390
7391 #undef elf_backend_static_tls_alignment
7392
7393 #undef elf_backend_want_plt_sym
7394 #define elf_backend_want_plt_sym 0
7395
7396 #undef elf_backend_strtab_flags
7397 #undef elf_backend_copy_special_section_fields
7398
7399 #include "elf32-target.h"
7400
7401 /* Restore defaults. */
7402 #undef ELF_ARCH
7403 #define ELF_ARCH bfd_arch_i386
7404 #undef ELF_MACHINE_CODE
7405 #define ELF_MACHINE_CODE EM_386
7406
7407 /* Native Client support. */
7408
7409 #undef TARGET_LITTLE_SYM
7410 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
7411 #undef TARGET_LITTLE_NAME
7412 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
7413 #undef elf32_bed
7414 #define elf32_bed elf32_i386_nacl_bed
7415
7416 #undef ELF_MAXPAGESIZE
7417 #define ELF_MAXPAGESIZE 0x10000
7418
7419 /* Restore defaults. */
7420 #undef ELF_OSABI
7421 #undef elf_backend_want_plt_sym
7422 #define elf_backend_want_plt_sym 0
7423 #undef elf_backend_post_process_headers
7424 #undef elf_backend_static_tls_alignment
7425
7426 /* NaCl uses substantially different PLT entries for the same effects. */
7427
7428 #undef elf_backend_plt_alignment
7429 #define elf_backend_plt_alignment 5
7430 #define NACL_PLT_ENTRY_SIZE 64
7431 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
7432
7433 static const bfd_byte elf_i386_nacl_plt0_entry[] =
7434 {
7435 0xff, 0x35, /* pushl contents of address */
7436 0, 0, 0, 0, /* replaced with address of .got + 4. */
7437 0x8b, 0x0d, /* movl contents of address, %ecx */
7438 0, 0, 0, 0, /* replaced with address of .got + 8. */
7439 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
7440 0xff, 0xe1 /* jmp *%ecx */
7441 };
7442
7443 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
7444 {
7445 0x8b, 0x0d, /* movl contents of address, %ecx */
7446 0, 0, 0, 0, /* replaced with GOT slot address. */
7447 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
7448 0xff, 0xe1, /* jmp *%ecx */
7449
7450 /* Pad to the next 32-byte boundary with nop instructions. */
7451 0x90,
7452 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7453 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7454
7455 /* Lazy GOT entries point here (32-byte aligned). */
7456 0x68, /* pushl immediate */
7457 0, 0, 0, 0, /* replaced with reloc offset. */
7458 0xe9, /* jmp relative */
7459 0, 0, 0, 0, /* replaced with offset to .plt. */
7460
7461 /* Pad to the next 32-byte boundary with nop instructions. */
7462 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7463 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7464 0x90, 0x90
7465 };
7466
7467 static const bfd_byte
7468 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
7469 {
7470 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
7471 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
7472 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
7473 0xff, 0xe1, /* jmp *%ecx */
7474
7475 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
7476 so pad to that size with nop instructions. */
7477 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
7478 };
7479
7480 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
7481 {
7482 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
7483 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
7484 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
7485 0xff, 0xe1, /* jmp *%ecx */
7486
7487 /* Pad to the next 32-byte boundary with nop instructions. */
7488 0x90,
7489 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7490 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7491
7492 /* Lazy GOT entries point here (32-byte aligned). */
7493 0x68, /* pushl immediate */
7494 0, 0, 0, 0, /* replaced with offset into relocation table. */
7495 0xe9, /* jmp relative */
7496 0, 0, 0, 0, /* replaced with offset to start of .plt. */
7497
7498 /* Pad to the next 32-byte boundary with nop instructions. */
7499 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7500 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
7501 0x90, 0x90
7502 };
7503
7504 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
7505 {
7506 #if (PLT_CIE_LENGTH != 20 \
7507 || PLT_FDE_LENGTH != 36 \
7508 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
7509 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
7510 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
7511 #endif
7512 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
7513 0, 0, 0, 0, /* CIE ID */
7514 1, /* CIE version */
7515 'z', 'R', 0, /* Augmentation string */
7516 1, /* Code alignment factor */
7517 0x7c, /* Data alignment factor: -4 */
7518 8, /* Return address column */
7519 1, /* Augmentation size */
7520 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
7521 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
7522 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
7523 DW_CFA_nop, DW_CFA_nop,
7524
7525 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
7526 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
7527 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
7528 0, 0, 0, 0, /* .plt size goes here */
7529 0, /* Augmentation size */
7530 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
7531 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
7532 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
7533 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
7534 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
7535 13, /* Block length */
7536 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
7537 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
7538 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
7539 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
7540 DW_CFA_nop, DW_CFA_nop
7541 };
7542
7543 static const struct elf_i386_lazy_plt_layout elf_i386_nacl_plt =
7544 {
7545 elf_i386_nacl_plt0_entry, /* plt0_entry */
7546 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
7547 2, /* plt0_got1_offset */
7548 8, /* plt0_got2_offset */
7549 elf_i386_nacl_plt_entry, /* plt_entry */
7550 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
7551 2, /* plt_got_offset */
7552 33, /* plt_reloc_offset */
7553 38, /* plt_plt_offset */
7554 32, /* plt_lazy_offset */
7555 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
7556 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
7557 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
7558 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
7559 };
7560
7561 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
7562 {
7563 0x90, /* plt0_pad_byte: nop insn */
7564 is_nacl /* os */
7565 };
7566
7567 static bfd_boolean
7568 elf32_i386_nacl_elf_object_p (bfd *abfd)
7569 {
7570 /* Set the right machine number for a NaCl i386 ELF32 file. */
7571 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
7572 return TRUE;
7573 }
7574
7575 #undef elf_backend_arch_data
7576 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
7577
7578 #undef elf_backend_object_p
7579 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
7580 #undef elf_backend_modify_segment_map
7581 #define elf_backend_modify_segment_map nacl_modify_segment_map
7582 #undef elf_backend_modify_program_headers
7583 #define elf_backend_modify_program_headers nacl_modify_program_headers
7584 #undef elf_backend_final_write_processing
7585 #define elf_backend_final_write_processing nacl_final_write_processing
7586
7587 #include "elf32-target.h"
7588
7589 /* Restore defaults. */
7590 #undef elf_backend_object_p
7591 #undef elf_backend_modify_segment_map
7592 #undef elf_backend_modify_program_headers
7593 #undef elf_backend_final_write_processing
7594
7595 /* VxWorks support. */
7596
7597 #undef TARGET_LITTLE_SYM
7598 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
7599 #undef TARGET_LITTLE_NAME
7600 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
7601 #undef ELF_OSABI
7602 #undef ELF_MAXPAGESIZE
7603 #define ELF_MAXPAGESIZE 0x1000
7604 #undef elf_backend_plt_alignment
7605 #define elf_backend_plt_alignment 4
7606
7607 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
7608 {
7609 0x90, /* plt0_pad_byte */
7610 is_vxworks /* os */
7611 };
7612
7613 #undef elf_backend_arch_data
7614 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
7615
7616 #undef elf_backend_relocs_compatible
7617 #undef elf_backend_add_symbol_hook
7618 #define elf_backend_add_symbol_hook \
7619 elf_vxworks_add_symbol_hook
7620 #undef elf_backend_link_output_symbol_hook
7621 #define elf_backend_link_output_symbol_hook \
7622 elf_vxworks_link_output_symbol_hook
7623 #undef elf_backend_emit_relocs
7624 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
7625 #undef elf_backend_final_write_processing
7626 #define elf_backend_final_write_processing \
7627 elf_vxworks_final_write_processing
7628 #undef elf_backend_static_tls_alignment
7629
7630 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
7631 define it. */
7632 #undef elf_backend_want_plt_sym
7633 #define elf_backend_want_plt_sym 1
7634
7635 #undef elf32_bed
7636 #define elf32_bed elf32_i386_vxworks_bed
7637
7638 #include "elf32-target.h"
GDB Binutils - Deliverables
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