projects / deliverable / binutils-gdb.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Fix a typo in comment in elf32-i386.c
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "opcode/i386.h"
33
34 /* 386 uses REL relocations instead of RELA. */
35 #define USE_REL 1
36
37 #include "elf/i386.h"
38
39 static reloc_howto_type elf_howto_table[]=
40 {
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
74
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
81
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
113
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
153
154 /* Another gap. */
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
157
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
160 0, /* rightshift */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
162 0, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
169 0, /* src_mask */
170 0, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 0, /* bitsize */
178 FALSE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0, /* dst_mask */
186 FALSE) /* pcrel_offset */
187
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
189
190 };
191
192 #ifdef DEBUG_GEN_RELOC
193 #define TRACE(str) \
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 #else
196 #define TRACE(str)
197 #endif
198
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
202 {
203 switch (code)
204 {
205 case BFD_RELOC_NONE:
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
208
209 case BFD_RELOC_32:
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_CTOR:
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
216
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
220
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
224
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
228
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
232
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
236
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
240
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
244
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
248
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
252
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
273
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
277
278 case BFD_RELOC_16:
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
281
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
285
286 case BFD_RELOC_8:
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
289
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
293
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
318
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
330
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
334
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
338
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
342
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
346
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
350
351 default:
352 break;
353 }
354
355 TRACE ("Unknown");
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
369
370 return NULL;
371 }
372
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
375 {
376 unsigned int indx;
377
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
385 {
386 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
387 abfd, (int) r_type);
388 indx = R_386_NONE;
389 }
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table [indx].type != r_type)
392 return NULL;
393 return &elf_howto_table[indx];
394 }
395
396 static void
397 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
398 arelent *cache_ptr,
399 Elf_Internal_Rela *dst)
400 {
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
403 }
404
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
410
411 static bfd_boolean
412 elf_i386_is_local_label_name (bfd *abfd, const char *name)
413 {
414 if (name[0] == '.' && name[1] == 'X')
415 return TRUE;
416
417 return _bfd_elf_is_local_label_name (abfd, name);
418 }
419 \f
420 /* Support for core dump NOTE sections. */
421
422 static bfd_boolean
423 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
424 {
425 int offset;
426 size_t size;
427
428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
429 {
430 int pr_version = bfd_get_32 (abfd, note->descdata);
431
432 if (pr_version != 1)
433 return FALSE;
434
435 /* pr_cursig */
436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
437
438 /* pr_pid */
439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
440
441 /* pr_reg */
442 offset = 28;
443 size = bfd_get_32 (abfd, note->descdata + 8);
444 }
445 else
446 {
447 switch (note->descsz)
448 {
449 default:
450 return FALSE;
451
452 case 144: /* Linux/i386 */
453 /* pr_cursig */
454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
455
456 /* pr_pid */
457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
458
459 /* pr_reg */
460 offset = 72;
461 size = 68;
462
463 break;
464 }
465 }
466
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
469 size, note->descpos + offset);
470 }
471
472 static bfd_boolean
473 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
474 {
475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
476 {
477 int pr_version = bfd_get_32 (abfd, note->descdata);
478
479 if (pr_version != 1)
480 return FALSE;
481
482 elf_tdata (abfd)->core->program
483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
484 elf_tdata (abfd)->core->command
485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
486 }
487 else
488 {
489 switch (note->descsz)
490 {
491 default:
492 return FALSE;
493
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd)->core->pid
496 = bfd_get_32 (abfd, note->descdata + 12);
497 elf_tdata (abfd)->core->program
498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
499 elf_tdata (abfd)->core->command
500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
501 }
502 }
503
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
507 {
508 char *command = elf_tdata (abfd)->core->command;
509 int n = strlen (command);
510
511 if (0 < n && command[n - 1] == ' ')
512 command[n - 1] = '\0';
513 }
514
515 return TRUE;
516 }
517 \f
518 /* Functions for the i386 ELF linker.
519
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
522 following:
523
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
530
531
532 /* The name of the dynamic interpreter. This is put in the .interp
533 section. */
534
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
536
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
540 shared lib. */
541 #define ELIMINATE_COPY_RELOCS 1
542
543 /* The size in bytes of an entry in the procedure linkage table. */
544
545 #define PLT_ENTRY_SIZE 16
546
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
550
551 static const bfd_byte elf_i386_plt0_entry[12] =
552 {
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
557 };
558
559 /* Subsequent entries in an absolute procedure linkage table look like
560 this. */
561
562 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
570 };
571
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
574
575 static const bfd_byte elf_i386_pic_plt0_entry[12] =
576 {
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
579 };
580
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
582
583 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
584 {
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
591 };
592
593 /* Entries in the GOT procedure linkage table look like this. */
594
595 static const bfd_byte elf_i386_got_plt_entry[8] =
596 {
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
600 };
601
602 /* Entries in the PIC GOT procedure linkage table look like this. */
603
604 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
605 {
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
609 };
610
611 /* .eh_frame covering the .plt section. */
612
613 static const bfd_byte elf_i386_eh_frame_plt[] =
614 {
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
621 1, /* CIE version */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop, DW_CFA_nop,
631
632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
646 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
648 };
649
650 struct elf_i386_plt_layout
651 {
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte *plt0_entry;
654 unsigned int plt0_entry_size;
655
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset;
658 unsigned int plt0_got2_offset;
659
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte *plt_entry;
662 unsigned int plt_entry_size;
663
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
668
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset;
671
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte *pic_plt0_entry;
674
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte *pic_plt_entry;
677
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte *eh_frame_plt;
680 unsigned int eh_frame_plt_size;
681 };
682
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
685
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt =
688 {
689 elf_i386_plt0_entry, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry, /* plt_entry */
694 PLT_ENTRY_SIZE, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry, /* pic_plt_entry */
701 elf_i386_eh_frame_plt, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
703 };
704 \f
705
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
711
712 /* Architecture-specific backend data for i386. */
713
714 struct elf_i386_backend_data
715 {
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout *plt;
718
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte;
721
722 /* True if the target system is VxWorks. */
723 int is_vxworks;
724 };
725
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
729
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed =
732 {
733 &elf_i386_plt, /* plt */
734 0, /* plt0_pad_byte */
735 0, /* is_vxworks */
736 };
737
738 #define elf_backend_arch_data &elf_i386_arch_bed
739
740 /* i386 ELF linker hash entry. */
741
742 struct elf_i386_link_hash_entry
743 {
744 struct elf_link_hash_entry elf;
745
746 /* Track dynamic relocs copied for this symbol. */
747 struct elf_dyn_relocs *dyn_relocs;
748
749 #define GOT_UNKNOWN 0
750 #define GOT_NORMAL 1
751 #define GOT_TLS_GD 2
752 #define GOT_TLS_IE 4
753 #define GOT_TLS_IE_POS 5
754 #define GOT_TLS_IE_NEG 6
755 #define GOT_TLS_IE_BOTH 7
756 #define GOT_TLS_GDESC 8
757 #define GOT_TLS_GD_BOTH_P(type) \
758 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
759 #define GOT_TLS_GD_P(type) \
760 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
761 #define GOT_TLS_GDESC_P(type) \
762 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GD_ANY_P(type) \
764 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
765 unsigned char tls_type;
766
767 /* Symbol is referenced by R_386_GOTOFF relocation. */
768 unsigned int gotoff_ref : 1;
769
770 /* Reference count of C/C++ function pointer relocations in read-write
771 section which can be resolved at run-time. */
772 bfd_signed_vma func_pointer_refcount;
773
774 /* Information about the GOT PLT entry. Filled when there are both
775 GOT and PLT relocations against the same function. */
776 union gotplt_union plt_got;
777
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
780 bfd_vma tlsdesc_got;
781 };
782
783 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
784
785 struct elf_i386_obj_tdata
786 {
787 struct elf_obj_tdata root;
788
789 /* tls_type for each local got entry. */
790 char *local_got_tls_type;
791
792 /* GOTPLT entries for TLS descriptors. */
793 bfd_vma *local_tlsdesc_gotent;
794 };
795
796 #define elf_i386_tdata(abfd) \
797 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
798
799 #define elf_i386_local_got_tls_type(abfd) \
800 (elf_i386_tdata (abfd)->local_got_tls_type)
801
802 #define elf_i386_local_tlsdesc_gotent(abfd) \
803 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
804
805 #define is_i386_elf(bfd) \
806 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
807 && elf_tdata (bfd) != NULL \
808 && elf_object_id (bfd) == I386_ELF_DATA)
809
810 static bfd_boolean
811 elf_i386_mkobject (bfd *abfd)
812 {
813 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
814 I386_ELF_DATA);
815 }
816
817 /* i386 ELF linker hash table. */
818
819 struct elf_i386_link_hash_table
820 {
821 struct elf_link_hash_table elf;
822
823 /* Short-cuts to get to dynamic linker sections. */
824 asection *sdynbss;
825 asection *srelbss;
826 asection *plt_eh_frame;
827 asection *plt_got;
828
829 union
830 {
831 bfd_signed_vma refcount;
832 bfd_vma offset;
833 } tls_ldm_got;
834
835 /* The amount of space used by the reserved portion of the sgotplt
836 section, plus whatever space is used by the jump slots. */
837 bfd_vma sgotplt_jump_table_size;
838
839 /* Small local sym cache. */
840 struct sym_cache sym_cache;
841
842 /* _TLS_MODULE_BASE_ symbol. */
843 struct bfd_link_hash_entry *tls_module_base;
844
845 /* Used by local STT_GNU_IFUNC symbols. */
846 htab_t loc_hash_table;
847 void * loc_hash_memory;
848
849 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
850 asection *srelplt2;
851
852 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
853 bfd_vma next_tls_desc_index;
854
855 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
856 bfd_vma next_jump_slot_index;
857
858 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
859 bfd_vma next_irelative_index;
860 };
861
862 /* Get the i386 ELF linker hash table from a link_info structure. */
863
864 #define elf_i386_hash_table(p) \
865 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
866 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
867
868 #define elf_i386_compute_jump_table_size(htab) \
869 ((htab)->elf.srelplt->reloc_count * 4)
870
871 /* Create an entry in an i386 ELF linker hash table. */
872
873 static struct bfd_hash_entry *
874 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
875 struct bfd_hash_table *table,
876 const char *string)
877 {
878 /* Allocate the structure if it has not already been allocated by a
879 subclass. */
880 if (entry == NULL)
881 {
882 entry = (struct bfd_hash_entry *)
883 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
884 if (entry == NULL)
885 return entry;
886 }
887
888 /* Call the allocation method of the superclass. */
889 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
890 if (entry != NULL)
891 {
892 struct elf_i386_link_hash_entry *eh;
893
894 eh = (struct elf_i386_link_hash_entry *) entry;
895 eh->dyn_relocs = NULL;
896 eh->tls_type = GOT_UNKNOWN;
897 eh->gotoff_ref = 0;
898 eh->func_pointer_refcount = 0;
899 eh->plt_got.offset = (bfd_vma) -1;
900 eh->tlsdesc_got = (bfd_vma) -1;
901 }
902
903 return entry;
904 }
905
906 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
907 for local symbol so that we can handle local STT_GNU_IFUNC symbols
908 as global symbol. We reuse indx and dynstr_index for local symbol
909 hash since they aren't used by global symbols in this backend. */
910
911 static hashval_t
912 elf_i386_local_htab_hash (const void *ptr)
913 {
914 struct elf_link_hash_entry *h
915 = (struct elf_link_hash_entry *) ptr;
916 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
917 }
918
919 /* Compare local hash entries. */
920
921 static int
922 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
923 {
924 struct elf_link_hash_entry *h1
925 = (struct elf_link_hash_entry *) ptr1;
926 struct elf_link_hash_entry *h2
927 = (struct elf_link_hash_entry *) ptr2;
928
929 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
930 }
931
932 /* Find and/or create a hash entry for local symbol. */
933
934 static struct elf_link_hash_entry *
935 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
936 bfd *abfd, const Elf_Internal_Rela *rel,
937 bfd_boolean create)
938 {
939 struct elf_i386_link_hash_entry e, *ret;
940 asection *sec = abfd->sections;
941 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
942 ELF32_R_SYM (rel->r_info));
943 void **slot;
944
945 e.elf.indx = sec->id;
946 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
947 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
948 create ? INSERT : NO_INSERT);
949
950 if (!slot)
951 return NULL;
952
953 if (*slot)
954 {
955 ret = (struct elf_i386_link_hash_entry *) *slot;
956 return &ret->elf;
957 }
958
959 ret = (struct elf_i386_link_hash_entry *)
960 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
961 sizeof (struct elf_i386_link_hash_entry));
962 if (ret)
963 {
964 memset (ret, 0, sizeof (*ret));
965 ret->elf.indx = sec->id;
966 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
967 ret->elf.dynindx = -1;
968 ret->func_pointer_refcount = 0;
969 ret->plt_got.offset = (bfd_vma) -1;
970 *slot = ret;
971 }
972 return &ret->elf;
973 }
974
975 /* Destroy an i386 ELF linker hash table. */
976
977 static void
978 elf_i386_link_hash_table_free (bfd *obfd)
979 {
980 struct elf_i386_link_hash_table *htab
981 = (struct elf_i386_link_hash_table *) obfd->link.hash;
982
983 if (htab->loc_hash_table)
984 htab_delete (htab->loc_hash_table);
985 if (htab->loc_hash_memory)
986 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
987 _bfd_elf_link_hash_table_free (obfd);
988 }
989
990 /* Create an i386 ELF linker hash table. */
991
992 static struct bfd_link_hash_table *
993 elf_i386_link_hash_table_create (bfd *abfd)
994 {
995 struct elf_i386_link_hash_table *ret;
996 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
997
998 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
999 if (ret == NULL)
1000 return NULL;
1001
1002 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1003 elf_i386_link_hash_newfunc,
1004 sizeof (struct elf_i386_link_hash_entry),
1005 I386_ELF_DATA))
1006 {
1007 free (ret);
1008 return NULL;
1009 }
1010
1011 ret->loc_hash_table = htab_try_create (1024,
1012 elf_i386_local_htab_hash,
1013 elf_i386_local_htab_eq,
1014 NULL);
1015 ret->loc_hash_memory = objalloc_create ();
1016 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1017 {
1018 elf_i386_link_hash_table_free (abfd);
1019 return NULL;
1020 }
1021 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1022
1023 return &ret->elf.root;
1024 }
1025
1026 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1027 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1028 hash table. */
1029
1030 static bfd_boolean
1031 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1032 {
1033 struct elf_i386_link_hash_table *htab;
1034
1035 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1036 return FALSE;
1037
1038 htab = elf_i386_hash_table (info);
1039 if (htab == NULL)
1040 return FALSE;
1041
1042 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1043 if (!htab->sdynbss)
1044 abort ();
1045
1046 if (bfd_link_executable (info))
1047 {
1048 /* Always allow copy relocs for building executables. */
1049 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1050 if (s == NULL)
1051 {
1052 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1053 s = bfd_make_section_anyway_with_flags (dynobj,
1054 ".rel.bss",
1055 (bed->dynamic_sec_flags
1056 | SEC_READONLY));
1057 if (s == NULL
1058 || ! bfd_set_section_alignment (dynobj, s,
1059 bed->s->log_file_align))
1060 return FALSE;
1061 }
1062 htab->srelbss = s;
1063 }
1064
1065 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1066 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1067 &htab->srelplt2))
1068 return FALSE;
1069
1070 if (!info->no_ld_generated_unwind_info
1071 && htab->plt_eh_frame == NULL
1072 && htab->elf.splt != NULL)
1073 {
1074 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1075 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1076 | SEC_LINKER_CREATED);
1077 htab->plt_eh_frame
1078 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1079 if (htab->plt_eh_frame == NULL
1080 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1081 return FALSE;
1082 }
1083
1084 return TRUE;
1085 }
1086
1087 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1088
1089 static void
1090 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1091 struct elf_link_hash_entry *dir,
1092 struct elf_link_hash_entry *ind)
1093 {
1094 struct elf_i386_link_hash_entry *edir, *eind;
1095
1096 edir = (struct elf_i386_link_hash_entry *) dir;
1097 eind = (struct elf_i386_link_hash_entry *) ind;
1098
1099 if (eind->dyn_relocs != NULL)
1100 {
1101 if (edir->dyn_relocs != NULL)
1102 {
1103 struct elf_dyn_relocs **pp;
1104 struct elf_dyn_relocs *p;
1105
1106 /* Add reloc counts against the indirect sym to the direct sym
1107 list. Merge any entries against the same section. */
1108 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1109 {
1110 struct elf_dyn_relocs *q;
1111
1112 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1113 if (q->sec == p->sec)
1114 {
1115 q->pc_count += p->pc_count;
1116 q->count += p->count;
1117 *pp = p->next;
1118 break;
1119 }
1120 if (q == NULL)
1121 pp = &p->next;
1122 }
1123 *pp = edir->dyn_relocs;
1124 }
1125
1126 edir->dyn_relocs = eind->dyn_relocs;
1127 eind->dyn_relocs = NULL;
1128 }
1129
1130 if (ind->root.type == bfd_link_hash_indirect
1131 && dir->got.refcount <= 0)
1132 {
1133 edir->tls_type = eind->tls_type;
1134 eind->tls_type = GOT_UNKNOWN;
1135 }
1136
1137 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1138 generate a R_386_COPY reloc. */
1139 edir->gotoff_ref |= eind->gotoff_ref;
1140
1141 if (ELIMINATE_COPY_RELOCS
1142 && ind->root.type != bfd_link_hash_indirect
1143 && dir->dynamic_adjusted)
1144 {
1145 /* If called to transfer flags for a weakdef during processing
1146 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1147 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1148 dir->ref_dynamic |= ind->ref_dynamic;
1149 dir->ref_regular |= ind->ref_regular;
1150 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1151 dir->needs_plt |= ind->needs_plt;
1152 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1153 }
1154 else
1155 {
1156 if (eind->func_pointer_refcount > 0)
1157 {
1158 edir->func_pointer_refcount += eind->func_pointer_refcount;
1159 eind->func_pointer_refcount = 0;
1160 }
1161
1162 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1163 }
1164 }
1165
1166 /* Return TRUE if the TLS access code sequence support transition
1167 from R_TYPE. */
1168
1169 static bfd_boolean
1170 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1171 bfd_byte *contents,
1172 Elf_Internal_Shdr *symtab_hdr,
1173 struct elf_link_hash_entry **sym_hashes,
1174 unsigned int r_type,
1175 const Elf_Internal_Rela *rel,
1176 const Elf_Internal_Rela *relend)
1177 {
1178 unsigned int val, type;
1179 unsigned long r_symndx;
1180 struct elf_link_hash_entry *h;
1181 bfd_vma offset;
1182
1183 /* Get the section contents. */
1184 if (contents == NULL)
1185 {
1186 if (elf_section_data (sec)->this_hdr.contents != NULL)
1187 contents = elf_section_data (sec)->this_hdr.contents;
1188 else
1189 {
1190 /* FIXME: How to better handle error condition? */
1191 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1192 return FALSE;
1193
1194 /* Cache the section contents for elf_link_input_bfd. */
1195 elf_section_data (sec)->this_hdr.contents = contents;
1196 }
1197 }
1198
1199 offset = rel->r_offset;
1200 switch (r_type)
1201 {
1202 case R_386_TLS_GD:
1203 case R_386_TLS_LDM:
1204 if (offset < 2 || (rel + 1) >= relend)
1205 return FALSE;
1206
1207 type = bfd_get_8 (abfd, contents + offset - 2);
1208 if (r_type == R_386_TLS_GD)
1209 {
1210 /* Check transition from GD access model. Only
1211 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1212 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1213 can transit to different access model. */
1214 if ((offset + 10) > sec->size ||
1215 (type != 0x8d && type != 0x04))
1216 return FALSE;
1217
1218 val = bfd_get_8 (abfd, contents + offset - 1);
1219 if (type == 0x04)
1220 {
1221 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1222 if (offset < 3)
1223 return FALSE;
1224
1225 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1226 return FALSE;
1227
1228 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1229 return FALSE;
1230 }
1231 else
1232 {
1233 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1234 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1235 return FALSE;
1236
1237 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1238 return FALSE;
1239 }
1240 }
1241 else
1242 {
1243 /* Check transition from LD access model. Only
1244 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1245 can transit to different access model. */
1246 if (type != 0x8d || (offset + 9) > sec->size)
1247 return FALSE;
1248
1249 val = bfd_get_8 (abfd, contents + offset - 1);
1250 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1251 return FALSE;
1252 }
1253
1254 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1255 return FALSE;
1256
1257 r_symndx = ELF32_R_SYM (rel[1].r_info);
1258 if (r_symndx < symtab_hdr->sh_info)
1259 return FALSE;
1260
1261 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1262 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1263 may be versioned. */
1264 return (h != NULL
1265 && h->root.root.string != NULL
1266 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1267 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1268 && (strncmp (h->root.root.string, "___tls_get_addr",
1269 15) == 0));
1270
1271 case R_386_TLS_IE:
1272 /* Check transition from IE access model:
1273 movl foo@indntpoff(%rip), %eax
1274 movl foo@indntpoff(%rip), %reg
1275 addl foo@indntpoff(%rip), %reg
1276 */
1277
1278 if (offset < 1 || (offset + 4) > sec->size)
1279 return FALSE;
1280
1281 /* Check "movl foo@tpoff(%rip), %eax" first. */
1282 val = bfd_get_8 (abfd, contents + offset - 1);
1283 if (val == 0xa1)
1284 return TRUE;
1285
1286 if (offset < 2)
1287 return FALSE;
1288
1289 /* Check movl|addl foo@tpoff(%rip), %reg. */
1290 type = bfd_get_8 (abfd, contents + offset - 2);
1291 return ((type == 0x8b || type == 0x03)
1292 && (val & 0xc7) == 0x05);
1293
1294 case R_386_TLS_GOTIE:
1295 case R_386_TLS_IE_32:
1296 /* Check transition from {IE_32,GOTIE} access model:
1297 subl foo@{tpoff,gontoff}(%reg1), %reg2
1298 movl foo@{tpoff,gontoff}(%reg1), %reg2
1299 addl foo@{tpoff,gontoff}(%reg1), %reg2
1300 */
1301
1302 if (offset < 2 || (offset + 4) > sec->size)
1303 return FALSE;
1304
1305 val = bfd_get_8 (abfd, contents + offset - 1);
1306 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1307 return FALSE;
1308
1309 type = bfd_get_8 (abfd, contents + offset - 2);
1310 return type == 0x8b || type == 0x2b || type == 0x03;
1311
1312 case R_386_TLS_GOTDESC:
1313 /* Check transition from GDesc access model:
1314 leal x@tlsdesc(%ebx), %eax
1315
1316 Make sure it's a leal adding ebx to a 32-bit offset
1317 into any register, although it's probably almost always
1318 going to be eax. */
1319
1320 if (offset < 2 || (offset + 4) > sec->size)
1321 return FALSE;
1322
1323 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1324 return FALSE;
1325
1326 val = bfd_get_8 (abfd, contents + offset - 1);
1327 return (val & 0xc7) == 0x83;
1328
1329 case R_386_TLS_DESC_CALL:
1330 /* Check transition from GDesc access model:
1331 call *x@tlsdesc(%rax)
1332 */
1333 if (offset + 2 <= sec->size)
1334 {
1335 /* Make sure that it's a call *x@tlsdesc(%rax). */
1336 static const unsigned char call[] = { 0xff, 0x10 };
1337 return memcmp (contents + offset, call, 2) == 0;
1338 }
1339
1340 return FALSE;
1341
1342 default:
1343 abort ();
1344 }
1345 }
1346
1347 /* Return TRUE if the TLS access transition is OK or no transition
1348 will be performed. Update R_TYPE if there is a transition. */
1349
1350 static bfd_boolean
1351 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1352 asection *sec, bfd_byte *contents,
1353 Elf_Internal_Shdr *symtab_hdr,
1354 struct elf_link_hash_entry **sym_hashes,
1355 unsigned int *r_type, int tls_type,
1356 const Elf_Internal_Rela *rel,
1357 const Elf_Internal_Rela *relend,
1358 struct elf_link_hash_entry *h,
1359 unsigned long r_symndx)
1360 {
1361 unsigned int from_type = *r_type;
1362 unsigned int to_type = from_type;
1363 bfd_boolean check = TRUE;
1364
1365 /* Skip TLS transition for functions. */
1366 if (h != NULL
1367 && (h->type == STT_FUNC
1368 || h->type == STT_GNU_IFUNC))
1369 return TRUE;
1370
1371 switch (from_type)
1372 {
1373 case R_386_TLS_GD:
1374 case R_386_TLS_GOTDESC:
1375 case R_386_TLS_DESC_CALL:
1376 case R_386_TLS_IE_32:
1377 case R_386_TLS_IE:
1378 case R_386_TLS_GOTIE:
1379 if (bfd_link_executable (info))
1380 {
1381 if (h == NULL)
1382 to_type = R_386_TLS_LE_32;
1383 else if (from_type != R_386_TLS_IE
1384 && from_type != R_386_TLS_GOTIE)
1385 to_type = R_386_TLS_IE_32;
1386 }
1387
1388 /* When we are called from elf_i386_relocate_section, CONTENTS
1389 isn't NULL and there may be additional transitions based on
1390 TLS_TYPE. */
1391 if (contents != NULL)
1392 {
1393 unsigned int new_to_type = to_type;
1394
1395 if (bfd_link_executable (info)
1396 && h != NULL
1397 && h->dynindx == -1
1398 && (tls_type & GOT_TLS_IE))
1399 new_to_type = R_386_TLS_LE_32;
1400
1401 if (to_type == R_386_TLS_GD
1402 || to_type == R_386_TLS_GOTDESC
1403 || to_type == R_386_TLS_DESC_CALL)
1404 {
1405 if (tls_type == GOT_TLS_IE_POS)
1406 new_to_type = R_386_TLS_GOTIE;
1407 else if (tls_type & GOT_TLS_IE)
1408 new_to_type = R_386_TLS_IE_32;
1409 }
1410
1411 /* We checked the transition before when we were called from
1412 elf_i386_check_relocs. We only want to check the new
1413 transition which hasn't been checked before. */
1414 check = new_to_type != to_type && from_type == to_type;
1415 to_type = new_to_type;
1416 }
1417
1418 break;
1419
1420 case R_386_TLS_LDM:
1421 if (bfd_link_executable (info))
1422 to_type = R_386_TLS_LE_32;
1423 break;
1424
1425 default:
1426 return TRUE;
1427 }
1428
1429 /* Return TRUE if there is no transition. */
1430 if (from_type == to_type)
1431 return TRUE;
1432
1433 /* Check if the transition can be performed. */
1434 if (check
1435 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1436 symtab_hdr, sym_hashes,
1437 from_type, rel, relend))
1438 {
1439 reloc_howto_type *from, *to;
1440 const char *name;
1441
1442 from = elf_i386_rtype_to_howto (abfd, from_type);
1443 to = elf_i386_rtype_to_howto (abfd, to_type);
1444
1445 if (h)
1446 name = h->root.root.string;
1447 else
1448 {
1449 struct elf_i386_link_hash_table *htab;
1450
1451 htab = elf_i386_hash_table (info);
1452 if (htab == NULL)
1453 name = "*unknown*";
1454 else
1455 {
1456 Elf_Internal_Sym *isym;
1457
1458 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1459 abfd, r_symndx);
1460 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1461 }
1462 }
1463
1464 (*_bfd_error_handler)
1465 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1466 "in section `%A' failed"),
1467 abfd, sec, from->name, to->name, name,
1468 (unsigned long) rel->r_offset);
1469 bfd_set_error (bfd_error_bad_value);
1470 return FALSE;
1471 }
1472
1473 *r_type = to_type;
1474 return TRUE;
1475 }
1476
1477 /* Rename some of the generic section flags to better document how they
1478 are used here. */
1479 #define need_convert_load sec_flg0
1480
1481 /* Look through the relocs for a section during the first phase, and
1482 calculate needed space in the global offset table, procedure linkage
1483 table, and dynamic reloc sections. */
1484
1485 static bfd_boolean
1486 elf_i386_check_relocs (bfd *abfd,
1487 struct bfd_link_info *info,
1488 asection *sec,
1489 const Elf_Internal_Rela *relocs)
1490 {
1491 struct elf_i386_link_hash_table *htab;
1492 Elf_Internal_Shdr *symtab_hdr;
1493 struct elf_link_hash_entry **sym_hashes;
1494 const Elf_Internal_Rela *rel;
1495 const Elf_Internal_Rela *rel_end;
1496 asection *sreloc;
1497 bfd_boolean use_plt_got;
1498
1499 if (bfd_link_relocatable (info))
1500 return TRUE;
1501
1502 BFD_ASSERT (is_i386_elf (abfd));
1503
1504 htab = elf_i386_hash_table (info);
1505 if (htab == NULL)
1506 return FALSE;
1507
1508 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1509 && (get_elf_i386_backend_data (abfd)
1510 == &elf_i386_arch_bed));
1511
1512 symtab_hdr = &elf_symtab_hdr (abfd);
1513 sym_hashes = elf_sym_hashes (abfd);
1514
1515 sreloc = NULL;
1516
1517 rel_end = relocs + sec->reloc_count;
1518 for (rel = relocs; rel < rel_end; rel++)
1519 {
1520 unsigned int r_type;
1521 unsigned long r_symndx;
1522 struct elf_link_hash_entry *h;
1523 struct elf_i386_link_hash_entry *eh;
1524 Elf_Internal_Sym *isym;
1525 const char *name;
1526 bfd_boolean size_reloc;
1527
1528 r_symndx = ELF32_R_SYM (rel->r_info);
1529 r_type = ELF32_R_TYPE (rel->r_info);
1530
1531 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1532 {
1533 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1534 abfd,
1535 r_symndx);
1536 return FALSE;
1537 }
1538
1539 if (r_symndx < symtab_hdr->sh_info)
1540 {
1541 /* A local symbol. */
1542 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1543 abfd, r_symndx);
1544 if (isym == NULL)
1545 return FALSE;
1546
1547 /* Check relocation against local STT_GNU_IFUNC symbol. */
1548 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1549 {
1550 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1551 if (h == NULL)
1552 return FALSE;
1553
1554 /* Fake a STT_GNU_IFUNC symbol. */
1555 h->type = STT_GNU_IFUNC;
1556 h->def_regular = 1;
1557 h->ref_regular = 1;
1558 h->forced_local = 1;
1559 h->root.type = bfd_link_hash_defined;
1560 }
1561 else
1562 h = NULL;
1563 }
1564 else
1565 {
1566 isym = NULL;
1567 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1568 while (h->root.type == bfd_link_hash_indirect
1569 || h->root.type == bfd_link_hash_warning)
1570 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1571 }
1572
1573 eh = (struct elf_i386_link_hash_entry *) h;
1574 if (h != NULL)
1575 {
1576 /* Create the ifunc sections for static executables. If we
1577 never see an indirect function symbol nor we are building
1578 a static executable, those sections will be empty and
1579 won't appear in output. */
1580 switch (r_type)
1581 {
1582 default:
1583 break;
1584
1585 case R_386_GOTOFF:
1586 eh->gotoff_ref = 1;
1587 case R_386_32:
1588 case R_386_PC32:
1589 case R_386_PLT32:
1590 case R_386_GOT32:
1591 case R_386_GOT32X:
1592 if (htab->elf.dynobj == NULL)
1593 htab->elf.dynobj = abfd;
1594 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1595 return FALSE;
1596 break;
1597 }
1598
1599 /* It is referenced by a non-shared object. */
1600 h->ref_regular = 1;
1601 h->root.non_ir_ref = 1;
1602
1603 if (h->type == STT_GNU_IFUNC)
1604 elf_tdata (info->output_bfd)->has_gnu_symbols
1605 |= elf_gnu_symbol_ifunc;
1606 }
1607
1608 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1609 symtab_hdr, sym_hashes,
1610 &r_type, GOT_UNKNOWN,
1611 rel, rel_end, h, r_symndx))
1612 return FALSE;
1613
1614 switch (r_type)
1615 {
1616 case R_386_TLS_LDM:
1617 htab->tls_ldm_got.refcount += 1;
1618 goto create_got;
1619
1620 case R_386_PLT32:
1621 /* This symbol requires a procedure linkage table entry. We
1622 actually build the entry in adjust_dynamic_symbol,
1623 because this might be a case of linking PIC code which is
1624 never referenced by a dynamic object, in which case we
1625 don't need to generate a procedure linkage table entry
1626 after all. */
1627
1628 /* If this is a local symbol, we resolve it directly without
1629 creating a procedure linkage table entry. */
1630 if (h == NULL)
1631 continue;
1632
1633 h->needs_plt = 1;
1634 h->plt.refcount += 1;
1635 break;
1636
1637 case R_386_SIZE32:
1638 size_reloc = TRUE;
1639 goto do_size;
1640
1641 case R_386_TLS_IE_32:
1642 case R_386_TLS_IE:
1643 case R_386_TLS_GOTIE:
1644 if (!bfd_link_executable (info))
1645 info->flags |= DF_STATIC_TLS;
1646 /* Fall through */
1647
1648 case R_386_GOT32:
1649 case R_386_GOT32X:
1650 case R_386_TLS_GD:
1651 case R_386_TLS_GOTDESC:
1652 case R_386_TLS_DESC_CALL:
1653 /* This symbol requires a global offset table entry. */
1654 {
1655 int tls_type, old_tls_type;
1656
1657 switch (r_type)
1658 {
1659 default:
1660 case R_386_GOT32:
1661 case R_386_GOT32X:
1662 tls_type = GOT_NORMAL;
1663 break;
1664 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1665 case R_386_TLS_GOTDESC:
1666 case R_386_TLS_DESC_CALL:
1667 tls_type = GOT_TLS_GDESC; break;
1668 case R_386_TLS_IE_32:
1669 if (ELF32_R_TYPE (rel->r_info) == r_type)
1670 tls_type = GOT_TLS_IE_NEG;
1671 else
1672 /* If this is a GD->IE transition, we may use either of
1673 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1674 tls_type = GOT_TLS_IE;
1675 break;
1676 case R_386_TLS_IE:
1677 case R_386_TLS_GOTIE:
1678 tls_type = GOT_TLS_IE_POS; break;
1679 }
1680
1681 if (h != NULL)
1682 {
1683 h->got.refcount += 1;
1684 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1685 }
1686 else
1687 {
1688 bfd_signed_vma *local_got_refcounts;
1689
1690 /* This is a global offset table entry for a local symbol. */
1691 local_got_refcounts = elf_local_got_refcounts (abfd);
1692 if (local_got_refcounts == NULL)
1693 {
1694 bfd_size_type size;
1695
1696 size = symtab_hdr->sh_info;
1697 size *= (sizeof (bfd_signed_vma)
1698 + sizeof (bfd_vma) + sizeof(char));
1699 local_got_refcounts = (bfd_signed_vma *)
1700 bfd_zalloc (abfd, size);
1701 if (local_got_refcounts == NULL)
1702 return FALSE;
1703 elf_local_got_refcounts (abfd) = local_got_refcounts;
1704 elf_i386_local_tlsdesc_gotent (abfd)
1705 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1706 elf_i386_local_got_tls_type (abfd)
1707 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1708 }
1709 local_got_refcounts[r_symndx] += 1;
1710 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1711 }
1712
1713 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1714 tls_type |= old_tls_type;
1715 /* If a TLS symbol is accessed using IE at least once,
1716 there is no point to use dynamic model for it. */
1717 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1718 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1719 || (tls_type & GOT_TLS_IE) == 0))
1720 {
1721 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1722 tls_type = old_tls_type;
1723 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1724 && GOT_TLS_GD_ANY_P (tls_type))
1725 tls_type |= old_tls_type;
1726 else
1727 {
1728 if (h)
1729 name = h->root.root.string;
1730 else
1731 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1732 NULL);
1733 (*_bfd_error_handler)
1734 (_("%B: `%s' accessed both as normal and "
1735 "thread local symbol"),
1736 abfd, name);
1737 bfd_set_error (bfd_error_bad_value);
1738 return FALSE;
1739 }
1740 }
1741
1742 if (old_tls_type != tls_type)
1743 {
1744 if (h != NULL)
1745 elf_i386_hash_entry (h)->tls_type = tls_type;
1746 else
1747 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1748 }
1749 }
1750 /* Fall through */
1751
1752 case R_386_GOTOFF:
1753 case R_386_GOTPC:
1754 create_got:
1755 if (htab->elf.sgot == NULL)
1756 {
1757 if (htab->elf.dynobj == NULL)
1758 htab->elf.dynobj = abfd;
1759 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1760 return FALSE;
1761 }
1762 if (r_type != R_386_TLS_IE)
1763 break;
1764 /* Fall through */
1765
1766 case R_386_TLS_LE_32:
1767 case R_386_TLS_LE:
1768 if (bfd_link_executable (info))
1769 break;
1770 info->flags |= DF_STATIC_TLS;
1771 /* Fall through */
1772
1773 case R_386_32:
1774 case R_386_PC32:
1775 if (h != NULL && bfd_link_executable (info))
1776 {
1777 /* If this reloc is in a read-only section, we might
1778 need a copy reloc. We can't check reliably at this
1779 stage whether the section is read-only, as input
1780 sections have not yet been mapped to output sections.
1781 Tentatively set the flag for now, and correct in
1782 adjust_dynamic_symbol. */
1783 h->non_got_ref = 1;
1784
1785 /* We may need a .plt entry if the function this reloc
1786 refers to is in a shared lib. */
1787 h->plt.refcount += 1;
1788 if (r_type == R_386_PC32)
1789 {
1790 /* Since something like ".long foo - ." may be used
1791 as pointer, make sure that PLT is used if foo is
1792 a function defined in a shared library. */
1793 if ((sec->flags & SEC_CODE) == 0)
1794 h->pointer_equality_needed = 1;
1795 }
1796 else
1797 {
1798 h->pointer_equality_needed = 1;
1799 /* R_386_32 can be resolved at run-time. */
1800 if (r_type == R_386_32
1801 && (sec->flags & SEC_READONLY) == 0)
1802 eh->func_pointer_refcount += 1;
1803 }
1804 }
1805
1806 size_reloc = FALSE;
1807 do_size:
1808 /* If we are creating a shared library, and this is a reloc
1809 against a global symbol, or a non PC relative reloc
1810 against a local symbol, then we need to copy the reloc
1811 into the shared library. However, if we are linking with
1812 -Bsymbolic, we do not need to copy a reloc against a
1813 global symbol which is defined in an object we are
1814 including in the link (i.e., DEF_REGULAR is set). At
1815 this point we have not seen all the input files, so it is
1816 possible that DEF_REGULAR is not set now but will be set
1817 later (it is never cleared). In case of a weak definition,
1818 DEF_REGULAR may be cleared later by a strong definition in
1819 a shared library. We account for that possibility below by
1820 storing information in the relocs_copied field of the hash
1821 table entry. A similar situation occurs when creating
1822 shared libraries and symbol visibility changes render the
1823 symbol local.
1824
1825 If on the other hand, we are creating an executable, we
1826 may need to keep relocations for symbols satisfied by a
1827 dynamic library if we manage to avoid copy relocs for the
1828 symbol. */
1829 if ((bfd_link_pic (info)
1830 && (sec->flags & SEC_ALLOC) != 0
1831 && (r_type != R_386_PC32
1832 || (h != NULL
1833 && (! SYMBOLIC_BIND (info, h)
1834 || h->root.type == bfd_link_hash_defweak
1835 || !h->def_regular))))
1836 || (ELIMINATE_COPY_RELOCS
1837 && !bfd_link_pic (info)
1838 && (sec->flags & SEC_ALLOC) != 0
1839 && h != NULL
1840 && (h->root.type == bfd_link_hash_defweak
1841 || !h->def_regular)))
1842 {
1843 struct elf_dyn_relocs *p;
1844 struct elf_dyn_relocs **head;
1845
1846 /* We must copy these reloc types into the output file.
1847 Create a reloc section in dynobj and make room for
1848 this reloc. */
1849 if (sreloc == NULL)
1850 {
1851 if (htab->elf.dynobj == NULL)
1852 htab->elf.dynobj = abfd;
1853
1854 sreloc = _bfd_elf_make_dynamic_reloc_section
1855 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1856
1857 if (sreloc == NULL)
1858 return FALSE;
1859 }
1860
1861 /* If this is a global symbol, we count the number of
1862 relocations we need for this symbol. */
1863 if (h != NULL)
1864 {
1865 head = &eh->dyn_relocs;
1866 }
1867 else
1868 {
1869 /* Track dynamic relocs needed for local syms too.
1870 We really need local syms available to do this
1871 easily. Oh well. */
1872 void **vpp;
1873 asection *s;
1874
1875 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1876 abfd, r_symndx);
1877 if (isym == NULL)
1878 return FALSE;
1879
1880 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1881 if (s == NULL)
1882 s = sec;
1883
1884 vpp = &elf_section_data (s)->local_dynrel;
1885 head = (struct elf_dyn_relocs **)vpp;
1886 }
1887
1888 p = *head;
1889 if (p == NULL || p->sec != sec)
1890 {
1891 bfd_size_type amt = sizeof *p;
1892 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1893 amt);
1894 if (p == NULL)
1895 return FALSE;
1896 p->next = *head;
1897 *head = p;
1898 p->sec = sec;
1899 p->count = 0;
1900 p->pc_count = 0;
1901 }
1902
1903 p->count += 1;
1904 /* Count size relocation as PC-relative relocation. */
1905 if (r_type == R_386_PC32 || size_reloc)
1906 p->pc_count += 1;
1907 }
1908 break;
1909
1910 /* This relocation describes the C++ object vtable hierarchy.
1911 Reconstruct it for later use during GC. */
1912 case R_386_GNU_VTINHERIT:
1913 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1914 return FALSE;
1915 break;
1916
1917 /* This relocation describes which C++ vtable entries are actually
1918 used. Record for later use during GC. */
1919 case R_386_GNU_VTENTRY:
1920 BFD_ASSERT (h != NULL);
1921 if (h != NULL
1922 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1923 return FALSE;
1924 break;
1925
1926 default:
1927 break;
1928 }
1929
1930 if (use_plt_got
1931 && h != NULL
1932 && h->plt.refcount > 0
1933 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1934 || h->got.refcount > 0)
1935 && htab->plt_got == NULL)
1936 {
1937 /* Create the GOT procedure linkage table. */
1938 unsigned int plt_got_align;
1939 const struct elf_backend_data *bed;
1940
1941 bed = get_elf_backend_data (info->output_bfd);
1942 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1943 && (sizeof (elf_i386_got_plt_entry)
1944 == sizeof (elf_i386_pic_got_plt_entry)));
1945 plt_got_align = 3;
1946
1947 if (htab->elf.dynobj == NULL)
1948 htab->elf.dynobj = abfd;
1949 htab->plt_got
1950 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1951 ".plt.got",
1952 (bed->dynamic_sec_flags
1953 | SEC_ALLOC
1954 | SEC_CODE
1955 | SEC_LOAD
1956 | SEC_READONLY));
1957 if (htab->plt_got == NULL
1958 || !bfd_set_section_alignment (htab->elf.dynobj,
1959 htab->plt_got,
1960 plt_got_align))
1961 return FALSE;
1962 }
1963
1964 if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
1965 && (h == NULL || h->type != STT_GNU_IFUNC))
1966 sec->need_convert_load = 1;
1967 }
1968
1969 return TRUE;
1970 }
1971
1972 /* Return the section that should be marked against GC for a given
1973 relocation. */
1974
1975 static asection *
1976 elf_i386_gc_mark_hook (asection *sec,
1977 struct bfd_link_info *info,
1978 Elf_Internal_Rela *rel,
1979 struct elf_link_hash_entry *h,
1980 Elf_Internal_Sym *sym)
1981 {
1982 if (h != NULL)
1983 switch (ELF32_R_TYPE (rel->r_info))
1984 {
1985 case R_386_GNU_VTINHERIT:
1986 case R_386_GNU_VTENTRY:
1987 return NULL;
1988 }
1989
1990 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1991 }
1992
1993 /* Update the got entry reference counts for the section being removed. */
1994
1995 static bfd_boolean
1996 elf_i386_gc_sweep_hook (bfd *abfd,
1997 struct bfd_link_info *info,
1998 asection *sec,
1999 const Elf_Internal_Rela *relocs)
2000 {
2001 struct elf_i386_link_hash_table *htab;
2002 Elf_Internal_Shdr *symtab_hdr;
2003 struct elf_link_hash_entry **sym_hashes;
2004 bfd_signed_vma *local_got_refcounts;
2005 const Elf_Internal_Rela *rel, *relend;
2006
2007 if (bfd_link_relocatable (info))
2008 return TRUE;
2009
2010 htab = elf_i386_hash_table (info);
2011 if (htab == NULL)
2012 return FALSE;
2013
2014 elf_section_data (sec)->local_dynrel = NULL;
2015
2016 symtab_hdr = &elf_symtab_hdr (abfd);
2017 sym_hashes = elf_sym_hashes (abfd);
2018 local_got_refcounts = elf_local_got_refcounts (abfd);
2019
2020 relend = relocs + sec->reloc_count;
2021 for (rel = relocs; rel < relend; rel++)
2022 {
2023 unsigned long r_symndx;
2024 unsigned int r_type;
2025 struct elf_link_hash_entry *h = NULL;
2026
2027 r_symndx = ELF32_R_SYM (rel->r_info);
2028 if (r_symndx >= symtab_hdr->sh_info)
2029 {
2030 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2031 while (h->root.type == bfd_link_hash_indirect
2032 || h->root.type == bfd_link_hash_warning)
2033 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2034 }
2035 else
2036 {
2037 /* A local symbol. */
2038 Elf_Internal_Sym *isym;
2039
2040 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2041 abfd, r_symndx);
2042
2043 /* Check relocation against local STT_GNU_IFUNC symbol. */
2044 if (isym != NULL
2045 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2046 {
2047 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2048 if (h == NULL)
2049 abort ();
2050 }
2051 }
2052
2053 if (h)
2054 {
2055 struct elf_i386_link_hash_entry *eh;
2056 struct elf_dyn_relocs **pp;
2057 struct elf_dyn_relocs *p;
2058
2059 eh = (struct elf_i386_link_hash_entry *) h;
2060 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2061 if (p->sec == sec)
2062 {
2063 /* Everything must go for SEC. */
2064 *pp = p->next;
2065 break;
2066 }
2067 }
2068
2069 r_type = ELF32_R_TYPE (rel->r_info);
2070 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2071 symtab_hdr, sym_hashes,
2072 &r_type, GOT_UNKNOWN,
2073 rel, relend, h, r_symndx))
2074 return FALSE;
2075
2076 switch (r_type)
2077 {
2078 case R_386_TLS_LDM:
2079 if (htab->tls_ldm_got.refcount > 0)
2080 htab->tls_ldm_got.refcount -= 1;
2081 break;
2082
2083 case R_386_TLS_GD:
2084 case R_386_TLS_GOTDESC:
2085 case R_386_TLS_DESC_CALL:
2086 case R_386_TLS_IE_32:
2087 case R_386_TLS_IE:
2088 case R_386_TLS_GOTIE:
2089 case R_386_GOT32:
2090 case R_386_GOT32X:
2091 if (h != NULL)
2092 {
2093 if (h->got.refcount > 0)
2094 h->got.refcount -= 1;
2095 if (h->type == STT_GNU_IFUNC)
2096 {
2097 if (h->plt.refcount > 0)
2098 h->plt.refcount -= 1;
2099 }
2100 }
2101 else if (local_got_refcounts != NULL)
2102 {
2103 if (local_got_refcounts[r_symndx] > 0)
2104 local_got_refcounts[r_symndx] -= 1;
2105 }
2106 break;
2107
2108 case R_386_32:
2109 case R_386_PC32:
2110 case R_386_SIZE32:
2111 if (bfd_link_pic (info)
2112 && (h == NULL || h->type != STT_GNU_IFUNC))
2113 break;
2114 /* Fall through */
2115
2116 case R_386_PLT32:
2117 if (h != NULL)
2118 {
2119 if (h->plt.refcount > 0)
2120 h->plt.refcount -= 1;
2121 if (r_type == R_386_32
2122 && (sec->flags & SEC_READONLY) == 0)
2123 {
2124 struct elf_i386_link_hash_entry *eh
2125 = (struct elf_i386_link_hash_entry *) h;
2126 if (eh->func_pointer_refcount > 0)
2127 eh->func_pointer_refcount -= 1;
2128 }
2129 }
2130 break;
2131
2132 case R_386_GOTOFF:
2133 if (h != NULL && h->type == STT_GNU_IFUNC)
2134 {
2135 if (h->got.refcount > 0)
2136 h->got.refcount -= 1;
2137 if (h->plt.refcount > 0)
2138 h->plt.refcount -= 1;
2139 }
2140 break;
2141
2142 default:
2143 break;
2144 }
2145 }
2146
2147 return TRUE;
2148 }
2149
2150 /* Adjust a symbol defined by a dynamic object and referenced by a
2151 regular object. The current definition is in some section of the
2152 dynamic object, but we're not including those sections. We have to
2153 change the definition to something the rest of the link can
2154 understand. */
2155
2156 static bfd_boolean
2157 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2158 struct elf_link_hash_entry *h)
2159 {
2160 struct elf_i386_link_hash_table *htab;
2161 asection *s;
2162 struct elf_i386_link_hash_entry *eh;
2163 struct elf_dyn_relocs *p;
2164
2165 /* STT_GNU_IFUNC symbol must go through PLT. */
2166 if (h->type == STT_GNU_IFUNC)
2167 {
2168 /* All local STT_GNU_IFUNC references must be treate as local
2169 calls via local PLT. */
2170 if (h->ref_regular
2171 && SYMBOL_CALLS_LOCAL (info, h))
2172 {
2173 bfd_size_type pc_count = 0, count = 0;
2174 struct elf_dyn_relocs **pp;
2175
2176 eh = (struct elf_i386_link_hash_entry *) h;
2177 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2178 {
2179 pc_count += p->pc_count;
2180 p->count -= p->pc_count;
2181 p->pc_count = 0;
2182 count += p->count;
2183 if (p->count == 0)
2184 *pp = p->next;
2185 else
2186 pp = &p->next;
2187 }
2188
2189 if (pc_count || count)
2190 {
2191 h->needs_plt = 1;
2192 h->non_got_ref = 1;
2193 if (h->plt.refcount <= 0)
2194 h->plt.refcount = 1;
2195 else
2196 h->plt.refcount += 1;
2197 }
2198 }
2199
2200 if (h->plt.refcount <= 0)
2201 {
2202 h->plt.offset = (bfd_vma) -1;
2203 h->needs_plt = 0;
2204 }
2205 return TRUE;
2206 }
2207
2208 /* If this is a function, put it in the procedure linkage table. We
2209 will fill in the contents of the procedure linkage table later,
2210 when we know the address of the .got section. */
2211 if (h->type == STT_FUNC
2212 || h->needs_plt)
2213 {
2214 if (h->plt.refcount <= 0
2215 || SYMBOL_CALLS_LOCAL (info, h)
2216 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2217 && h->root.type == bfd_link_hash_undefweak))
2218 {
2219 /* This case can occur if we saw a PLT32 reloc in an input
2220 file, but the symbol was never referred to by a dynamic
2221 object, or if all references were garbage collected. In
2222 such a case, we don't actually need to build a procedure
2223 linkage table, and we can just do a PC32 reloc instead. */
2224 h->plt.offset = (bfd_vma) -1;
2225 h->needs_plt = 0;
2226 }
2227
2228 return TRUE;
2229 }
2230 else
2231 /* It's possible that we incorrectly decided a .plt reloc was
2232 needed for an R_386_PC32 reloc to a non-function sym in
2233 check_relocs. We can't decide accurately between function and
2234 non-function syms in check-relocs; Objects loaded later in
2235 the link may change h->type. So fix it now. */
2236 h->plt.offset = (bfd_vma) -1;
2237
2238 /* If this is a weak symbol, and there is a real definition, the
2239 processor independent code will have arranged for us to see the
2240 real definition first, and we can just use the same value. */
2241 if (h->u.weakdef != NULL)
2242 {
2243 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2244 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2245 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2246 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2247 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2248 h->non_got_ref = h->u.weakdef->non_got_ref;
2249 return TRUE;
2250 }
2251
2252 /* This is a reference to a symbol defined by a dynamic object which
2253 is not a function. */
2254
2255 /* If we are creating a shared library, we must presume that the
2256 only references to the symbol are via the global offset table.
2257 For such cases we need not do anything here; the relocations will
2258 be handled correctly by relocate_section. */
2259 if (!bfd_link_executable (info))
2260 return TRUE;
2261
2262 /* If there are no references to this symbol that do not use the
2263 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2264 reloc. */
2265 eh = (struct elf_i386_link_hash_entry *) h;
2266 if (!h->non_got_ref && !eh->gotoff_ref)
2267 return TRUE;
2268
2269 /* If -z nocopyreloc was given, we won't generate them either. */
2270 if (info->nocopyreloc)
2271 {
2272 h->non_got_ref = 0;
2273 return TRUE;
2274 }
2275
2276 htab = elf_i386_hash_table (info);
2277 if (htab == NULL)
2278 return FALSE;
2279
2280 /* If there aren't any dynamic relocs in read-only sections nor
2281 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2282 avoid the copy reloc. This doesn't work on VxWorks, where we can
2283 not have dynamic relocations (other than copy and jump slot
2284 relocations) in an executable. */
2285 if (ELIMINATE_COPY_RELOCS
2286 && !eh->gotoff_ref
2287 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2288 {
2289 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2290 {
2291 s = p->sec->output_section;
2292 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2293 break;
2294 }
2295
2296 if (p == NULL)
2297 {
2298 h->non_got_ref = 0;
2299 return TRUE;
2300 }
2301 }
2302
2303 /* We must allocate the symbol in our .dynbss section, which will
2304 become part of the .bss section of the executable. There will be
2305 an entry for this symbol in the .dynsym section. The dynamic
2306 object will contain position independent code, so all references
2307 from the dynamic object to this symbol will go through the global
2308 offset table. The dynamic linker will use the .dynsym entry to
2309 determine the address it must put in the global offset table, so
2310 both the dynamic object and the regular object will refer to the
2311 same memory location for the variable. */
2312
2313 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2314 copy the initial value out of the dynamic object and into the
2315 runtime process image. */
2316 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2317 {
2318 htab->srelbss->size += sizeof (Elf32_External_Rel);
2319 h->needs_copy = 1;
2320 }
2321
2322 s = htab->sdynbss;
2323
2324 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2325 }
2326
2327 /* Allocate space in .plt, .got and associated reloc sections for
2328 dynamic relocs. */
2329
2330 static bfd_boolean
2331 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2332 {
2333 struct bfd_link_info *info;
2334 struct elf_i386_link_hash_table *htab;
2335 struct elf_i386_link_hash_entry *eh;
2336 struct elf_dyn_relocs *p;
2337 unsigned plt_entry_size;
2338
2339 if (h->root.type == bfd_link_hash_indirect)
2340 return TRUE;
2341
2342 eh = (struct elf_i386_link_hash_entry *) h;
2343
2344 info = (struct bfd_link_info *) inf;
2345 htab = elf_i386_hash_table (info);
2346 if (htab == NULL)
2347 return FALSE;
2348
2349 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2350
2351 /* Clear the reference count of function pointer relocations if
2352 symbol isn't a normal function. */
2353 if (h->type != STT_FUNC)
2354 eh->func_pointer_refcount = 0;
2355
2356 /* We can't use the GOT PLT if pointer equality is needed since
2357 finish_dynamic_symbol won't clear symbol value and the dynamic
2358 linker won't update the GOT slot. We will get into an infinite
2359 loop at run-time. */
2360 if (htab->plt_got != NULL
2361 && h->type != STT_GNU_IFUNC
2362 && !h->pointer_equality_needed
2363 && h->plt.refcount > 0
2364 && h->got.refcount > 0)
2365 {
2366 /* Don't use the regular PLT if there are both GOT and GOTPLT
2367 reloctions. */
2368 h->plt.offset = (bfd_vma) -1;
2369
2370 /* Use the GOT PLT. */
2371 eh->plt_got.refcount = 1;
2372 }
2373
2374 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2375 here if it is defined and referenced in a non-shared object. */
2376 if (h->type == STT_GNU_IFUNC
2377 && h->def_regular)
2378 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2379 plt_entry_size,
2380 plt_entry_size, 4);
2381 /* Don't create the PLT entry if there are only function pointer
2382 relocations which can be resolved at run-time. */
2383 else if (htab->elf.dynamic_sections_created
2384 && (h->plt.refcount > eh->func_pointer_refcount
2385 || eh->plt_got.refcount > 0))
2386 {
2387 bfd_boolean use_plt_got;
2388
2389 /* Clear the reference count of function pointer relocations
2390 if PLT is used. */
2391 eh->func_pointer_refcount = 0;
2392
2393 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2394 {
2395 /* Don't use the regular PLT for DF_BIND_NOW. */
2396 h->plt.offset = (bfd_vma) -1;
2397
2398 /* Use the GOT PLT. */
2399 h->got.refcount = 1;
2400 eh->plt_got.refcount = 1;
2401 }
2402
2403 use_plt_got = eh->plt_got.refcount > 0;
2404
2405 /* Make sure this symbol is output as a dynamic symbol.
2406 Undefined weak syms won't yet be marked as dynamic. */
2407 if (h->dynindx == -1
2408 && !h->forced_local)
2409 {
2410 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2411 return FALSE;
2412 }
2413
2414 if (bfd_link_pic (info)
2415 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2416 {
2417 asection *s = htab->elf.splt;
2418 asection *got_s = htab->plt_got;
2419
2420 /* If this is the first .plt entry, make room for the special
2421 first entry. The .plt section is used by prelink to undo
2422 prelinking for dynamic relocations. */
2423 if (s->size == 0)
2424 s->size = plt_entry_size;
2425
2426 if (use_plt_got)
2427 eh->plt_got.offset = got_s->size;
2428 else
2429 h->plt.offset = s->size;
2430
2431 /* If this symbol is not defined in a regular file, and we are
2432 not generating a shared library, then set the symbol to this
2433 location in the .plt. This is required to make function
2434 pointers compare as equal between the normal executable and
2435 the shared library. */
2436 if (! bfd_link_pic (info)
2437 && !h->def_regular)
2438 {
2439 if (use_plt_got)
2440 {
2441 /* We need to make a call to the entry of the GOT PLT
2442 instead of regular PLT entry. */
2443 h->root.u.def.section = got_s;
2444 h->root.u.def.value = eh->plt_got.offset;
2445 }
2446 else
2447 {
2448 h->root.u.def.section = s;
2449 h->root.u.def.value = h->plt.offset;
2450 }
2451 }
2452
2453 /* Make room for this entry. */
2454 if (use_plt_got)
2455 got_s->size += sizeof (elf_i386_got_plt_entry);
2456 else
2457 {
2458 s->size += plt_entry_size;
2459
2460 /* We also need to make an entry in the .got.plt section,
2461 which will be placed in the .got section by the linker
2462 script. */
2463 htab->elf.sgotplt->size += 4;
2464
2465 /* We also need to make an entry in the .rel.plt section. */
2466 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2467 htab->elf.srelplt->reloc_count++;
2468 }
2469
2470 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2471 && !bfd_link_pic (info))
2472 {
2473 /* VxWorks has a second set of relocations for each PLT entry
2474 in executables. They go in a separate relocation section,
2475 which is processed by the kernel loader. */
2476
2477 /* There are two relocations for the initial PLT entry: an
2478 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2479 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2480
2481 if (h->plt.offset == plt_entry_size)
2482 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2483
2484 /* There are two extra relocations for each subsequent PLT entry:
2485 an R_386_32 relocation for the GOT entry, and an R_386_32
2486 relocation for the PLT entry. */
2487
2488 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2489 }
2490 }
2491 else
2492 {
2493 h->plt.offset = (bfd_vma) -1;
2494 h->needs_plt = 0;
2495 }
2496 }
2497 else
2498 {
2499 h->plt.offset = (bfd_vma) -1;
2500 h->needs_plt = 0;
2501 }
2502
2503 eh->tlsdesc_got = (bfd_vma) -1;
2504
2505 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2506 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2507 if (h->got.refcount > 0
2508 && bfd_link_executable (info)
2509 && h->dynindx == -1
2510 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2511 h->got.offset = (bfd_vma) -1;
2512 else if (h->got.refcount > 0)
2513 {
2514 asection *s;
2515 bfd_boolean dyn;
2516 int tls_type = elf_i386_hash_entry(h)->tls_type;
2517
2518 /* Make sure this symbol is output as a dynamic symbol.
2519 Undefined weak syms won't yet be marked as dynamic. */
2520 if (h->dynindx == -1
2521 && !h->forced_local)
2522 {
2523 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2524 return FALSE;
2525 }
2526
2527 s = htab->elf.sgot;
2528 if (GOT_TLS_GDESC_P (tls_type))
2529 {
2530 eh->tlsdesc_got = htab->elf.sgotplt->size
2531 - elf_i386_compute_jump_table_size (htab);
2532 htab->elf.sgotplt->size += 8;
2533 h->got.offset = (bfd_vma) -2;
2534 }
2535 if (! GOT_TLS_GDESC_P (tls_type)
2536 || GOT_TLS_GD_P (tls_type))
2537 {
2538 h->got.offset = s->size;
2539 s->size += 4;
2540 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2541 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2542 s->size += 4;
2543 }
2544 dyn = htab->elf.dynamic_sections_created;
2545 /* R_386_TLS_IE_32 needs one dynamic relocation,
2546 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2547 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2548 need two), R_386_TLS_GD needs one if local symbol and two if
2549 global. */
2550 if (tls_type == GOT_TLS_IE_BOTH)
2551 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2552 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2553 || (tls_type & GOT_TLS_IE))
2554 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2555 else if (GOT_TLS_GD_P (tls_type))
2556 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2557 else if (! GOT_TLS_GDESC_P (tls_type)
2558 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2559 || h->root.type != bfd_link_hash_undefweak)
2560 && (bfd_link_pic (info)
2561 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2562 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2563 if (GOT_TLS_GDESC_P (tls_type))
2564 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2565 }
2566 else
2567 h->got.offset = (bfd_vma) -1;
2568
2569 if (eh->dyn_relocs == NULL)
2570 return TRUE;
2571
2572 /* In the shared -Bsymbolic case, discard space allocated for
2573 dynamic pc-relative relocs against symbols which turn out to be
2574 defined in regular objects. For the normal shared case, discard
2575 space for pc-relative relocs that have become local due to symbol
2576 visibility changes. */
2577
2578 if (bfd_link_pic (info))
2579 {
2580 /* The only reloc that uses pc_count is R_386_PC32, which will
2581 appear on a call or on something like ".long foo - .". We
2582 want calls to protected symbols to resolve directly to the
2583 function rather than going via the plt. If people want
2584 function pointer comparisons to work as expected then they
2585 should avoid writing assembly like ".long foo - .". */
2586 if (SYMBOL_CALLS_LOCAL (info, h))
2587 {
2588 struct elf_dyn_relocs **pp;
2589
2590 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2591 {
2592 p->count -= p->pc_count;
2593 p->pc_count = 0;
2594 if (p->count == 0)
2595 *pp = p->next;
2596 else
2597 pp = &p->next;
2598 }
2599 }
2600
2601 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2602 {
2603 struct elf_dyn_relocs **pp;
2604 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2605 {
2606 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2607 *pp = p->next;
2608 else
2609 pp = &p->next;
2610 }
2611 }
2612
2613 /* Also discard relocs on undefined weak syms with non-default
2614 visibility. */
2615 if (eh->dyn_relocs != NULL
2616 && h->root.type == bfd_link_hash_undefweak)
2617 {
2618 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2619 eh->dyn_relocs = NULL;
2620
2621 /* Make sure undefined weak symbols are output as a dynamic
2622 symbol in PIEs. */
2623 else if (h->dynindx == -1
2624 && !h->forced_local)
2625 {
2626 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2627 return FALSE;
2628 }
2629 }
2630 }
2631 else if (ELIMINATE_COPY_RELOCS)
2632 {
2633 /* For the non-shared case, discard space for relocs against
2634 symbols which turn out to need copy relocs or are not
2635 dynamic. Keep dynamic relocations for run-time function
2636 pointer initialization. */
2637
2638 if ((!h->non_got_ref || eh->func_pointer_refcount > 0)
2639 && ((h->def_dynamic
2640 && !h->def_regular)
2641 || (htab->elf.dynamic_sections_created
2642 && (h->root.type == bfd_link_hash_undefweak
2643 || h->root.type == bfd_link_hash_undefined))))
2644 {
2645 /* Make sure this symbol is output as a dynamic symbol.
2646 Undefined weak syms won't yet be marked as dynamic. */
2647 if (h->dynindx == -1
2648 && !h->forced_local)
2649 {
2650 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2651 return FALSE;
2652 }
2653
2654 /* If that succeeded, we know we'll be keeping all the
2655 relocs. */
2656 if (h->dynindx != -1)
2657 goto keep;
2658 }
2659
2660 eh->dyn_relocs = NULL;
2661 eh->func_pointer_refcount = 0;
2662
2663 keep: ;
2664 }
2665
2666 /* Finally, allocate space. */
2667 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2668 {
2669 asection *sreloc;
2670
2671 sreloc = elf_section_data (p->sec)->sreloc;
2672
2673 BFD_ASSERT (sreloc != NULL);
2674 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2675 }
2676
2677 return TRUE;
2678 }
2679
2680 /* Allocate space in .plt, .got and associated reloc sections for
2681 local dynamic relocs. */
2682
2683 static bfd_boolean
2684 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2685 {
2686 struct elf_link_hash_entry *h
2687 = (struct elf_link_hash_entry *) *slot;
2688
2689 if (h->type != STT_GNU_IFUNC
2690 || !h->def_regular
2691 || !h->ref_regular
2692 || !h->forced_local
2693 || h->root.type != bfd_link_hash_defined)
2694 abort ();
2695
2696 return elf_i386_allocate_dynrelocs (h, inf);
2697 }
2698
2699 /* Find any dynamic relocs that apply to read-only sections. */
2700
2701 static bfd_boolean
2702 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2703 {
2704 struct elf_i386_link_hash_entry *eh;
2705 struct elf_dyn_relocs *p;
2706
2707 /* Skip local IFUNC symbols. */
2708 if (h->forced_local && h->type == STT_GNU_IFUNC)
2709 return TRUE;
2710
2711 eh = (struct elf_i386_link_hash_entry *) h;
2712 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2713 {
2714 asection *s = p->sec->output_section;
2715
2716 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2717 {
2718 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2719
2720 info->flags |= DF_TEXTREL;
2721
2722 if ((info->warn_shared_textrel && bfd_link_pic (info))
2723 || info->error_textrel)
2724 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2725 p->sec->owner, h->root.root.string,
2726 p->sec);
2727
2728 /* Not an error, just cut short the traversal. */
2729 return FALSE;
2730 }
2731 }
2732 return TRUE;
2733 }
2734
2735 /* With the local symbol, foo, we convert
2736 mov foo@GOT[(%reg1)], %reg2
2737 to
2738 lea foo[@GOTOFF(%reg1)], %reg2
2739 and convert
2740 call/jmp *foo@GOT[(%reg)]
2741 to
2742 nop call foo/jmp foo nop
2743 When PIC is false, convert
2744 test %reg1, foo@GOT[(%reg2)]
2745 to
2746 test $foo, %reg1
2747 and convert
2748 binop foo@GOT[(%reg1)], %reg2
2749 to
2750 binop $foo, %reg2
2751 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2752 instructions. */
2753
2754 static bfd_boolean
2755 elf_i386_convert_load (bfd *abfd, asection *sec,
2756 struct bfd_link_info *link_info)
2757 {
2758 Elf_Internal_Shdr *symtab_hdr;
2759 Elf_Internal_Rela *internal_relocs;
2760 Elf_Internal_Rela *irel, *irelend;
2761 bfd_byte *contents;
2762 struct elf_i386_link_hash_table *htab;
2763 bfd_boolean changed_contents;
2764 bfd_boolean changed_relocs;
2765 bfd_signed_vma *local_got_refcounts;
2766
2767 /* Don't even try to convert non-ELF outputs. */
2768 if (!is_elf_hash_table (link_info->hash))
2769 return FALSE;
2770
2771 /* Nothing to do if there is no need or no output. */
2772 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2773 || sec->need_convert_load == 0
2774 || bfd_is_abs_section (sec->output_section))
2775 return TRUE;
2776
2777 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2778
2779 /* Load the relocations for this section. */
2780 internal_relocs = (_bfd_elf_link_read_relocs
2781 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2782 link_info->keep_memory));
2783 if (internal_relocs == NULL)
2784 return FALSE;
2785
2786 htab = elf_i386_hash_table (link_info);
2787 changed_contents = FALSE;
2788 changed_relocs = FALSE;
2789 local_got_refcounts = elf_local_got_refcounts (abfd);
2790
2791 /* Get the section contents. */
2792 if (elf_section_data (sec)->this_hdr.contents != NULL)
2793 contents = elf_section_data (sec)->this_hdr.contents;
2794 else
2795 {
2796 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2797 goto error_return;
2798 }
2799
2800 irelend = internal_relocs + sec->reloc_count;
2801 for (irel = internal_relocs; irel < irelend; irel++)
2802 {
2803 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2804 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2805 unsigned int indx;
2806 struct elf_link_hash_entry *h;
2807 unsigned int opcode;
2808 unsigned int modrm;
2809 bfd_vma roff;
2810 bfd_boolean baseless;
2811 Elf_Internal_Sym *isym;
2812 unsigned int addend;
2813 unsigned int nop;
2814 bfd_vma nop_offset;
2815
2816 if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
2817 continue;
2818
2819 roff = irel->r_offset;
2820 if (roff < 2)
2821 continue;
2822
2823 modrm = bfd_get_8 (abfd, contents + roff - 1);
2824 baseless = (modrm & 0xc7) == 0x5;
2825
2826 if (r_type == R_386_GOT32X
2827 && baseless
2828 && bfd_link_pic (link_info))
2829 {
2830 /* For PIC, disallow R_386_GOT32X without a base register
2831 since we don't know what the GOT base is. Allow
2832 R_386_GOT32 for existing object files. */
2833 const char *name;
2834
2835 if (r_symndx < symtab_hdr->sh_info)
2836 {
2837 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
2838 r_symndx);
2839 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2840 }
2841 else
2842 {
2843 indx = r_symndx - symtab_hdr->sh_info;
2844 h = elf_sym_hashes (abfd)[indx];
2845 BFD_ASSERT (h != NULL);
2846 name = h->root.root.string;
2847 }
2848
2849 (*_bfd_error_handler)
2850 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
2851 abfd, name);
2852 goto error_return;
2853 }
2854
2855 opcode = bfd_get_8 (abfd, contents + roff - 2);
2856
2857 /* It is OK to convert mov to lea. */
2858 if (opcode != 0x8b)
2859 {
2860 /* Only convert R_386_GOT32X relocation for call, jmp or
2861 one of adc, add, and, cmp, or, sbb, sub, test, xor
2862 instructions. */
2863 if (r_type != R_386_GOT32X)
2864 continue;
2865
2866 /* It is OK to convert indirect branch to direct branch. It
2867 is OK to convert adc, add, and, cmp, or, sbb, sub, test,
2868 xor only when PIC is false. */
2869 if (opcode != 0xff && bfd_link_pic (link_info))
2870 continue;
2871 }
2872
2873 /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
2874 referred to by the reloc. */
2875 if (r_symndx < symtab_hdr->sh_info)
2876 {
2877 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2878 abfd, r_symndx);
2879
2880 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2881 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2882 continue;
2883
2884 h = NULL;
2885 if (opcode == 0x0ff)
2886 /* Convert "call/jmp *foo@GOT[(%reg)]". */
2887 goto convert_branch;
2888 else
2889 /* Convert "mov foo@GOT[(%reg1)], %reg2",
2890 "test %reg1, foo@GOT(%reg2)" and
2891 "binop foo@GOT[(%reg1)], %reg2". */
2892 goto convert_load;
2893 }
2894
2895 indx = r_symndx - symtab_hdr->sh_info;
2896 h = elf_sym_hashes (abfd)[indx];
2897 BFD_ASSERT (h != NULL);
2898
2899 while (h->root.type == bfd_link_hash_indirect
2900 || h->root.type == bfd_link_hash_warning)
2901 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2902
2903 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2904 if (h->type == STT_GNU_IFUNC)
2905 continue;
2906
2907 if (opcode == 0xff)
2908 {
2909 /* We have "call/jmp *foo@GOT[(%reg)]". */
2910 if ((h->root.type == bfd_link_hash_defined
2911 || h->root.type == bfd_link_hash_defweak)
2912 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2913 {
2914 /* The function is locally defined. */
2915 convert_branch:
2916 addend = bfd_get_32 (abfd, contents + roff);
2917 /* Addend for R_386_GOT32X relocation must be 0. */
2918 if (addend != 0)
2919 continue;
2920
2921 /* Convert R_386_GOT32X to R_386_PC32. */
2922 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
2923 {
2924 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2925 is a nop prefix. */
2926 modrm = 0xe8;
2927 nop = link_info->call_nop_byte;
2928 if (link_info->call_nop_as_suffix)
2929 {
2930 nop_offset = roff + 3;
2931 irel->r_offset -= 1;
2932 }
2933 else
2934 nop_offset = roff - 2;
2935 }
2936 else
2937 {
2938 /* Convert to "jmp foo nop". */
2939 modrm = 0xe9;
2940 nop = NOP_OPCODE;
2941 nop_offset = roff + 3;
2942 irel->r_offset -= 1;
2943 }
2944
2945 bfd_put_8 (abfd, nop, contents + nop_offset);
2946 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2947 /* When converting to PC-relative relocation, we
2948 need to adjust addend by -4. */
2949 bfd_put_32 (abfd, -4, contents + irel->r_offset);
2950 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
2951
2952 if (h)
2953 {
2954 if (h->got.refcount > 0)
2955 h->got.refcount -= 1;
2956 }
2957 else
2958 {
2959 if (local_got_refcounts != NULL
2960 && local_got_refcounts[r_symndx] > 0)
2961 local_got_refcounts[r_symndx] -= 1;
2962 }
2963
2964 changed_contents = TRUE;
2965 changed_relocs = TRUE;
2966 }
2967 }
2968 else
2969 {
2970 /* We have "mov foo@GOT[(%re1g)], %reg2",
2971 "test %reg1, foo@GOT(%reg2)" and
2972 "binop foo@GOT[(%reg1)], %reg2".
2973
2974 Avoid optimizing _DYNAMIC since ld.so may use its
2975 link-time address. */
2976 if (h == htab->elf.hdynamic)
2977 continue;
2978
2979 /* bfd_link_hash_new is set by an assignment in a linker
2980 script in bfd_elf_record_link_assignment. */
2981 if ((h->root.type == bfd_link_hash_defined
2982 || h->root.type == bfd_link_hash_defweak
2983 || h->root.type == bfd_link_hash_new)
2984 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2985 {
2986 convert_load:
2987 if (opcode == 0x8b)
2988 {
2989 /* Convert "mov foo@GOT(%reg1), %reg2" to
2990 "lea foo@GOTOFF(%reg1), %reg2". */
2991 if (r_type == R_386_GOT32X
2992 && (baseless || !bfd_link_pic (link_info)))
2993 {
2994 r_type = R_386_32;
2995 /* For R_386_32, convert
2996 "lea foo@GOTOFF(%reg1), %reg2" to
2997 "lea foo@GOT, %reg2". */
2998 if (!baseless)
2999 {
3000 modrm = 0x5 | (modrm & 0x38);
3001 bfd_put_8 (abfd, modrm, contents + roff - 1);
3002 }
3003 }
3004 else
3005 r_type = R_386_GOTOFF;
3006 opcode = 0x8d;
3007 }
3008 else
3009 {
3010 /* Addend for R_386_GOT32X relocation must be 0. */
3011 addend = bfd_get_32 (abfd, contents + roff);
3012 if (addend != 0)
3013 continue;
3014
3015 if (opcode == 0x85)
3016 {
3017 /* Convert "test %reg1, foo@GOT(%reg2)" to
3018 "test $foo, %reg1". */
3019 modrm = 0xc0 | (modrm & 0x38) >> 3;
3020 opcode = 0xf7;
3021 }
3022 else
3023 {
3024 /* Convert "binop foo@GOT(%reg1), %reg2" to
3025 "binop $foo, %reg2". */
3026 modrm = (0xc0
3027 | (modrm & 0x38) >> 3
3028 | (opcode & 0x3c));
3029 opcode = 0x81;
3030 }
3031 bfd_put_8 (abfd, modrm, contents + roff - 1);
3032 r_type = R_386_32;
3033 }
3034
3035 bfd_put_8 (abfd, opcode, contents + roff - 2);
3036 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
3037
3038 if (h)
3039 {
3040 if (h->got.refcount > 0)
3041 h->got.refcount -= 1;
3042 }
3043 else
3044 {
3045 if (local_got_refcounts != NULL
3046 && local_got_refcounts[r_symndx] > 0)
3047 local_got_refcounts[r_symndx] -= 1;
3048 }
3049
3050 changed_contents = TRUE;
3051 changed_relocs = TRUE;
3052 }
3053 }
3054 }
3055
3056 if (contents != NULL
3057 && elf_section_data (sec)->this_hdr.contents != contents)
3058 {
3059 if (!changed_contents && !link_info->keep_memory)
3060 free (contents);
3061 else
3062 {
3063 /* Cache the section contents for elf_link_input_bfd. */
3064 elf_section_data (sec)->this_hdr.contents = contents;
3065 }
3066 }
3067
3068 if (elf_section_data (sec)->relocs != internal_relocs)
3069 {
3070 if (!changed_relocs)
3071 free (internal_relocs);
3072 else
3073 elf_section_data (sec)->relocs = internal_relocs;
3074 }
3075
3076 return TRUE;
3077
3078 error_return:
3079 if (contents != NULL
3080 && elf_section_data (sec)->this_hdr.contents != contents)
3081 free (contents);
3082 if (internal_relocs != NULL
3083 && elf_section_data (sec)->relocs != internal_relocs)
3084 free (internal_relocs);
3085 return FALSE;
3086 }
3087
3088 /* Set the sizes of the dynamic sections. */
3089
3090 static bfd_boolean
3091 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3092 {
3093 struct elf_i386_link_hash_table *htab;
3094 bfd *dynobj;
3095 asection *s;
3096 bfd_boolean relocs;
3097 bfd *ibfd;
3098
3099 htab = elf_i386_hash_table (info);
3100 if (htab == NULL)
3101 return FALSE;
3102 dynobj = htab->elf.dynobj;
3103 if (dynobj == NULL)
3104 abort ();
3105
3106 if (htab->elf.dynamic_sections_created)
3107 {
3108 /* Set the contents of the .interp section to the interpreter. */
3109 if (bfd_link_executable (info) && !info->nointerp)
3110 {
3111 s = bfd_get_linker_section (dynobj, ".interp");
3112 if (s == NULL)
3113 abort ();
3114 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
3115 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3116 }
3117 }
3118
3119 /* Set up .got offsets for local syms, and space for local dynamic
3120 relocs. */
3121 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3122 {
3123 bfd_signed_vma *local_got;
3124 bfd_signed_vma *end_local_got;
3125 char *local_tls_type;
3126 bfd_vma *local_tlsdesc_gotent;
3127 bfd_size_type locsymcount;
3128 Elf_Internal_Shdr *symtab_hdr;
3129 asection *srel;
3130
3131 if (! is_i386_elf (ibfd))
3132 continue;
3133
3134 for (s = ibfd->sections; s != NULL; s = s->next)
3135 {
3136 struct elf_dyn_relocs *p;
3137
3138 if (!elf_i386_convert_load (ibfd, s, info))
3139 return FALSE;
3140
3141 for (p = ((struct elf_dyn_relocs *)
3142 elf_section_data (s)->local_dynrel);
3143 p != NULL;
3144 p = p->next)
3145 {
3146 if (!bfd_is_abs_section (p->sec)
3147 && bfd_is_abs_section (p->sec->output_section))
3148 {
3149 /* Input section has been discarded, either because
3150 it is a copy of a linkonce section or due to
3151 linker script /DISCARD/, so we'll be discarding
3152 the relocs too. */
3153 }
3154 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3155 && strcmp (p->sec->output_section->name,
3156 ".tls_vars") == 0)
3157 {
3158 /* Relocations in vxworks .tls_vars sections are
3159 handled specially by the loader. */
3160 }
3161 else if (p->count != 0)
3162 {
3163 srel = elf_section_data (p->sec)->sreloc;
3164 srel->size += p->count * sizeof (Elf32_External_Rel);
3165 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3166 && (info->flags & DF_TEXTREL) == 0)
3167 {
3168 info->flags |= DF_TEXTREL;
3169 if ((info->warn_shared_textrel && bfd_link_pic (info))
3170 || info->error_textrel)
3171 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3172 p->sec->owner, p->sec);
3173 }
3174 }
3175 }
3176 }
3177
3178 local_got = elf_local_got_refcounts (ibfd);
3179 if (!local_got)
3180 continue;
3181
3182 symtab_hdr = &elf_symtab_hdr (ibfd);
3183 locsymcount = symtab_hdr->sh_info;
3184 end_local_got = local_got + locsymcount;
3185 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3186 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3187 s = htab->elf.sgot;
3188 srel = htab->elf.srelgot;
3189 for (; local_got < end_local_got;
3190 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3191 {
3192 *local_tlsdesc_gotent = (bfd_vma) -1;
3193 if (*local_got > 0)
3194 {
3195 if (GOT_TLS_GDESC_P (*local_tls_type))
3196 {
3197 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3198 - elf_i386_compute_jump_table_size (htab);
3199 htab->elf.sgotplt->size += 8;
3200 *local_got = (bfd_vma) -2;
3201 }
3202 if (! GOT_TLS_GDESC_P (*local_tls_type)
3203 || GOT_TLS_GD_P (*local_tls_type))
3204 {
3205 *local_got = s->size;
3206 s->size += 4;
3207 if (GOT_TLS_GD_P (*local_tls_type)
3208 || *local_tls_type == GOT_TLS_IE_BOTH)
3209 s->size += 4;
3210 }
3211 if (bfd_link_pic (info)
3212 || GOT_TLS_GD_ANY_P (*local_tls_type)
3213 || (*local_tls_type & GOT_TLS_IE))
3214 {
3215 if (*local_tls_type == GOT_TLS_IE_BOTH)
3216 srel->size += 2 * sizeof (Elf32_External_Rel);
3217 else if (GOT_TLS_GD_P (*local_tls_type)
3218 || ! GOT_TLS_GDESC_P (*local_tls_type))
3219 srel->size += sizeof (Elf32_External_Rel);
3220 if (GOT_TLS_GDESC_P (*local_tls_type))
3221 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3222 }
3223 }
3224 else
3225 *local_got = (bfd_vma) -1;
3226 }
3227 }
3228
3229 if (htab->tls_ldm_got.refcount > 0)
3230 {
3231 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3232 relocs. */
3233 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3234 htab->elf.sgot->size += 8;
3235 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3236 }
3237 else
3238 htab->tls_ldm_got.offset = -1;
3239
3240 /* Allocate global sym .plt and .got entries, and space for global
3241 sym dynamic relocs. */
3242 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3243
3244 /* Allocate .plt and .got entries, and space for local symbols. */
3245 htab_traverse (htab->loc_hash_table,
3246 elf_i386_allocate_local_dynrelocs,
3247 info);
3248
3249 /* For every jump slot reserved in the sgotplt, reloc_count is
3250 incremented. However, when we reserve space for TLS descriptors,
3251 it's not incremented, so in order to compute the space reserved
3252 for them, it suffices to multiply the reloc count by the jump
3253 slot size.
3254
3255 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3256 so that R_386_IRELATIVE entries come last. */
3257 if (htab->elf.srelplt)
3258 {
3259 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3260 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3261 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3262 }
3263 else if (htab->elf.irelplt)
3264 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3265
3266
3267 if (htab->elf.sgotplt)
3268 {
3269 /* Don't allocate .got.plt section if there are no GOT nor PLT
3270 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3271 if ((htab->elf.hgot == NULL
3272 || !htab->elf.hgot->ref_regular_nonweak)
3273 && (htab->elf.sgotplt->size
3274 == get_elf_backend_data (output_bfd)->got_header_size)
3275 && (htab->elf.splt == NULL
3276 || htab->elf.splt->size == 0)
3277 && (htab->elf.sgot == NULL
3278 || htab->elf.sgot->size == 0)
3279 && (htab->elf.iplt == NULL
3280 || htab->elf.iplt->size == 0)
3281 && (htab->elf.igotplt == NULL
3282 || htab->elf.igotplt->size == 0))
3283 htab->elf.sgotplt->size = 0;
3284 }
3285
3286
3287 if (htab->plt_eh_frame != NULL
3288 && htab->elf.splt != NULL
3289 && htab->elf.splt->size != 0
3290 && !bfd_is_abs_section (htab->elf.splt->output_section)
3291 && _bfd_elf_eh_frame_present (info))
3292 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3293
3294 /* We now have determined the sizes of the various dynamic sections.
3295 Allocate memory for them. */
3296 relocs = FALSE;
3297 for (s = dynobj->sections; s != NULL; s = s->next)
3298 {
3299 bfd_boolean strip_section = TRUE;
3300
3301 if ((s->flags & SEC_LINKER_CREATED) == 0)
3302 continue;
3303
3304 if (s == htab->elf.splt
3305 || s == htab->elf.sgot)
3306 {
3307 /* Strip this section if we don't need it; see the
3308 comment below. */
3309 /* We'd like to strip these sections if they aren't needed, but if
3310 we've exported dynamic symbols from them we must leave them.
3311 It's too late to tell BFD to get rid of the symbols. */
3312
3313 if (htab->elf.hplt != NULL)
3314 strip_section = FALSE;
3315 }
3316 else if (s == htab->elf.sgotplt
3317 || s == htab->elf.iplt
3318 || s == htab->elf.igotplt
3319 || s == htab->plt_got
3320 || s == htab->plt_eh_frame
3321 || s == htab->sdynbss)
3322 {
3323 /* Strip these too. */
3324 }
3325 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3326 {
3327 if (s->size != 0
3328 && s != htab->elf.srelplt
3329 && s != htab->srelplt2)
3330 relocs = TRUE;
3331
3332 /* We use the reloc_count field as a counter if we need
3333 to copy relocs into the output file. */
3334 s->reloc_count = 0;
3335 }
3336 else
3337 {
3338 /* It's not one of our sections, so don't allocate space. */
3339 continue;
3340 }
3341
3342 if (s->size == 0)
3343 {
3344 /* If we don't need this section, strip it from the
3345 output file. This is mostly to handle .rel.bss and
3346 .rel.plt. We must create both sections in
3347 create_dynamic_sections, because they must be created
3348 before the linker maps input sections to output
3349 sections. The linker does that before
3350 adjust_dynamic_symbol is called, and it is that
3351 function which decides whether anything needs to go
3352 into these sections. */
3353 if (strip_section)
3354 s->flags |= SEC_EXCLUDE;
3355 continue;
3356 }
3357
3358 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3359 continue;
3360
3361 /* Allocate memory for the section contents. We use bfd_zalloc
3362 here in case unused entries are not reclaimed before the
3363 section's contents are written out. This should not happen,
3364 but this way if it does, we get a R_386_NONE reloc instead
3365 of garbage. */
3366 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3367 if (s->contents == NULL)
3368 return FALSE;
3369 }
3370
3371 if (htab->plt_eh_frame != NULL
3372 && htab->plt_eh_frame->contents != NULL)
3373 {
3374 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3375 sizeof (elf_i386_eh_frame_plt));
3376 bfd_put_32 (dynobj, htab->elf.splt->size,
3377 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3378 }
3379
3380 if (htab->elf.dynamic_sections_created)
3381 {
3382 /* Add some entries to the .dynamic section. We fill in the
3383 values later, in elf_i386_finish_dynamic_sections, but we
3384 must add the entries now so that we get the correct size for
3385 the .dynamic section. The DT_DEBUG entry is filled in by the
3386 dynamic linker and used by the debugger. */
3387 #define add_dynamic_entry(TAG, VAL) \
3388 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3389
3390 if (bfd_link_executable (info))
3391 {
3392 if (!add_dynamic_entry (DT_DEBUG, 0))
3393 return FALSE;
3394 }
3395
3396 if (htab->elf.splt->size != 0)
3397 {
3398 /* DT_PLTGOT is used by prelink even if there is no PLT
3399 relocation. */
3400 if (!add_dynamic_entry (DT_PLTGOT, 0))
3401 return FALSE;
3402
3403 if (htab->elf.srelplt->size != 0)
3404 {
3405 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3406 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3407 || !add_dynamic_entry (DT_JMPREL, 0))
3408 return FALSE;
3409 }
3410 }
3411
3412 if (relocs)
3413 {
3414 if (!add_dynamic_entry (DT_REL, 0)
3415 || !add_dynamic_entry (DT_RELSZ, 0)
3416 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3417 return FALSE;
3418
3419 /* If any dynamic relocs apply to a read-only section,
3420 then we need a DT_TEXTREL entry. */
3421 if ((info->flags & DF_TEXTREL) == 0)
3422 elf_link_hash_traverse (&htab->elf,
3423 elf_i386_readonly_dynrelocs, info);
3424
3425 if ((info->flags & DF_TEXTREL) != 0)
3426 {
3427 if ((elf_tdata (output_bfd)->has_gnu_symbols
3428 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3429 {
3430 info->callbacks->einfo
3431 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3432 bfd_set_error (bfd_error_bad_value);
3433 return FALSE;
3434 }
3435
3436 if (!add_dynamic_entry (DT_TEXTREL, 0))
3437 return FALSE;
3438 }
3439 }
3440 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3441 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3442 return FALSE;
3443 }
3444 #undef add_dynamic_entry
3445
3446 return TRUE;
3447 }
3448
3449 static bfd_boolean
3450 elf_i386_always_size_sections (bfd *output_bfd,
3451 struct bfd_link_info *info)
3452 {
3453 asection *tls_sec = elf_hash_table (info)->tls_sec;
3454
3455 if (tls_sec)
3456 {
3457 struct elf_link_hash_entry *tlsbase;
3458
3459 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3460 "_TLS_MODULE_BASE_",
3461 FALSE, FALSE, FALSE);
3462
3463 if (tlsbase && tlsbase->type == STT_TLS)
3464 {
3465 struct elf_i386_link_hash_table *htab;
3466 struct bfd_link_hash_entry *bh = NULL;
3467 const struct elf_backend_data *bed
3468 = get_elf_backend_data (output_bfd);
3469
3470 htab = elf_i386_hash_table (info);
3471 if (htab == NULL)
3472 return FALSE;
3473
3474 if (!(_bfd_generic_link_add_one_symbol
3475 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3476 tls_sec, 0, NULL, FALSE,
3477 bed->collect, &bh)))
3478 return FALSE;
3479
3480 htab->tls_module_base = bh;
3481
3482 tlsbase = (struct elf_link_hash_entry *)bh;
3483 tlsbase->def_regular = 1;
3484 tlsbase->other = STV_HIDDEN;
3485 tlsbase->root.linker_def = 1;
3486 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3487 }
3488 }
3489
3490 return TRUE;
3491 }
3492
3493 /* Set the correct type for an x86 ELF section. We do this by the
3494 section name, which is a hack, but ought to work. */
3495
3496 static bfd_boolean
3497 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3498 Elf_Internal_Shdr *hdr,
3499 asection *sec)
3500 {
3501 const char *name;
3502
3503 name = bfd_get_section_name (abfd, sec);
3504
3505 /* This is an ugly, but unfortunately necessary hack that is
3506 needed when producing EFI binaries on x86. It tells
3507 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3508 containing ELF relocation info. We need this hack in order to
3509 be able to generate ELF binaries that can be translated into
3510 EFI applications (which are essentially COFF objects). Those
3511 files contain a COFF ".reloc" section inside an ELFNN object,
3512 which would normally cause BFD to segfault because it would
3513 attempt to interpret this section as containing relocation
3514 entries for section "oc". With this hack enabled, ".reloc"
3515 will be treated as a normal data section, which will avoid the
3516 segfault. However, you won't be able to create an ELFNN binary
3517 with a section named "oc" that needs relocations, but that's
3518 the kind of ugly side-effects you get when detecting section
3519 types based on their names... In practice, this limitation is
3520 unlikely to bite. */
3521 if (strcmp (name, ".reloc") == 0)
3522 hdr->sh_type = SHT_PROGBITS;
3523
3524 return TRUE;
3525 }
3526
3527 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3528 executables. Rather than setting it to the beginning of the TLS
3529 section, we have to set it to the end. This function may be called
3530 multiple times, it is idempotent. */
3531
3532 static void
3533 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3534 {
3535 struct elf_i386_link_hash_table *htab;
3536 struct bfd_link_hash_entry *base;
3537
3538 if (!bfd_link_executable (info))
3539 return;
3540
3541 htab = elf_i386_hash_table (info);
3542 if (htab == NULL)
3543 return;
3544
3545 base = htab->tls_module_base;
3546 if (base == NULL)
3547 return;
3548
3549 base->u.def.value = htab->elf.tls_size;
3550 }
3551
3552 /* Return the base VMA address which should be subtracted from real addresses
3553 when resolving @dtpoff relocation.
3554 This is PT_TLS segment p_vaddr. */
3555
3556 static bfd_vma
3557 elf_i386_dtpoff_base (struct bfd_link_info *info)
3558 {
3559 /* If tls_sec is NULL, we should have signalled an error already. */
3560 if (elf_hash_table (info)->tls_sec == NULL)
3561 return 0;
3562 return elf_hash_table (info)->tls_sec->vma;
3563 }
3564
3565 /* Return the relocation value for @tpoff relocation
3566 if STT_TLS virtual address is ADDRESS. */
3567
3568 static bfd_vma
3569 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3570 {
3571 struct elf_link_hash_table *htab = elf_hash_table (info);
3572 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3573 bfd_vma static_tls_size;
3574
3575 /* If tls_sec is NULL, we should have signalled an error already. */
3576 if (htab->tls_sec == NULL)
3577 return 0;
3578
3579 /* Consider special static TLS alignment requirements. */
3580 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3581 return static_tls_size + htab->tls_sec->vma - address;
3582 }
3583
3584 /* Relocate an i386 ELF section. */
3585
3586 static bfd_boolean
3587 elf_i386_relocate_section (bfd *output_bfd,
3588 struct bfd_link_info *info,
3589 bfd *input_bfd,
3590 asection *input_section,
3591 bfd_byte *contents,
3592 Elf_Internal_Rela *relocs,
3593 Elf_Internal_Sym *local_syms,
3594 asection **local_sections)
3595 {
3596 struct elf_i386_link_hash_table *htab;
3597 Elf_Internal_Shdr *symtab_hdr;
3598 struct elf_link_hash_entry **sym_hashes;
3599 bfd_vma *local_got_offsets;
3600 bfd_vma *local_tlsdesc_gotents;
3601 Elf_Internal_Rela *rel;
3602 Elf_Internal_Rela *relend;
3603 bfd_boolean is_vxworks_tls;
3604 unsigned plt_entry_size;
3605
3606 BFD_ASSERT (is_i386_elf (input_bfd));
3607
3608 htab = elf_i386_hash_table (info);
3609 if (htab == NULL)
3610 return FALSE;
3611 symtab_hdr = &elf_symtab_hdr (input_bfd);
3612 sym_hashes = elf_sym_hashes (input_bfd);
3613 local_got_offsets = elf_local_got_offsets (input_bfd);
3614 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3615 /* We have to handle relocations in vxworks .tls_vars sections
3616 specially, because the dynamic loader is 'weird'. */
3617 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3618 && bfd_link_pic (info)
3619 && !strcmp (input_section->output_section->name,
3620 ".tls_vars"));
3621
3622 elf_i386_set_tls_module_base (info);
3623
3624 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3625
3626 rel = relocs;
3627 relend = relocs + input_section->reloc_count;
3628 for (; rel < relend; rel++)
3629 {
3630 unsigned int r_type;
3631 reloc_howto_type *howto;
3632 unsigned long r_symndx;
3633 struct elf_link_hash_entry *h;
3634 struct elf_i386_link_hash_entry *eh;
3635 Elf_Internal_Sym *sym;
3636 asection *sec;
3637 bfd_vma off, offplt, plt_offset;
3638 bfd_vma relocation;
3639 bfd_boolean unresolved_reloc;
3640 bfd_reloc_status_type r;
3641 unsigned int indx;
3642 int tls_type;
3643 bfd_vma st_size;
3644 asection *resolved_plt;
3645
3646 r_type = ELF32_R_TYPE (rel->r_info);
3647 if (r_type == R_386_GNU_VTINHERIT
3648 || r_type == R_386_GNU_VTENTRY)
3649 continue;
3650
3651 if ((indx = r_type) >= R_386_standard
3652 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3653 >= R_386_ext - R_386_standard)
3654 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3655 >= R_386_ext2 - R_386_ext))
3656 {
3657 (*_bfd_error_handler)
3658 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3659 input_bfd, input_section, r_type);
3660 bfd_set_error (bfd_error_bad_value);
3661 return FALSE;
3662 }
3663 howto = elf_howto_table + indx;
3664
3665 r_symndx = ELF32_R_SYM (rel->r_info);
3666 h = NULL;
3667 sym = NULL;
3668 sec = NULL;
3669 unresolved_reloc = FALSE;
3670 if (r_symndx < symtab_hdr->sh_info)
3671 {
3672 sym = local_syms + r_symndx;
3673 sec = local_sections[r_symndx];
3674 relocation = (sec->output_section->vma
3675 + sec->output_offset
3676 + sym->st_value);
3677 st_size = sym->st_size;
3678
3679 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3680 && ((sec->flags & SEC_MERGE) != 0
3681 || (bfd_link_relocatable (info)
3682 && sec->output_offset != 0)))
3683 {
3684 bfd_vma addend;
3685 bfd_byte *where = contents + rel->r_offset;
3686
3687 switch (howto->size)
3688 {
3689 case 0:
3690 addend = bfd_get_8 (input_bfd, where);
3691 if (howto->pc_relative)
3692 {
3693 addend = (addend ^ 0x80) - 0x80;
3694 addend += 1;
3695 }
3696 break;
3697 case 1:
3698 addend = bfd_get_16 (input_bfd, where);
3699 if (howto->pc_relative)
3700 {
3701 addend = (addend ^ 0x8000) - 0x8000;
3702 addend += 2;
3703 }
3704 break;
3705 case 2:
3706 addend = bfd_get_32 (input_bfd, where);
3707 if (howto->pc_relative)
3708 {
3709 addend = (addend ^ 0x80000000) - 0x80000000;
3710 addend += 4;
3711 }
3712 break;
3713 default:
3714 abort ();
3715 }
3716
3717 if (bfd_link_relocatable (info))
3718 addend += sec->output_offset;
3719 else
3720 {
3721 asection *msec = sec;
3722 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3723 addend);
3724 addend -= relocation;
3725 addend += msec->output_section->vma + msec->output_offset;
3726 }
3727
3728 switch (howto->size)
3729 {
3730 case 0:
3731 /* FIXME: overflow checks. */
3732 if (howto->pc_relative)
3733 addend -= 1;
3734 bfd_put_8 (input_bfd, addend, where);
3735 break;
3736 case 1:
3737 if (howto->pc_relative)
3738 addend -= 2;
3739 bfd_put_16 (input_bfd, addend, where);
3740 break;
3741 case 2:
3742 if (howto->pc_relative)
3743 addend -= 4;
3744 bfd_put_32 (input_bfd, addend, where);
3745 break;
3746 }
3747 }
3748 else if (!bfd_link_relocatable (info)
3749 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3750 {
3751 /* Relocate against local STT_GNU_IFUNC symbol. */
3752 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3753 FALSE);
3754 if (h == NULL)
3755 abort ();
3756
3757 /* Set STT_GNU_IFUNC symbol value. */
3758 h->root.u.def.value = sym->st_value;
3759 h->root.u.def.section = sec;
3760 }
3761 }
3762 else
3763 {
3764 bfd_boolean warned ATTRIBUTE_UNUSED;
3765 bfd_boolean ignored ATTRIBUTE_UNUSED;
3766
3767 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3768 r_symndx, symtab_hdr, sym_hashes,
3769 h, sec, relocation,
3770 unresolved_reloc, warned, ignored);
3771 st_size = h->size;
3772 }
3773
3774 if (sec != NULL && discarded_section (sec))
3775 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3776 rel, 1, relend, howto, 0, contents);
3777
3778 if (bfd_link_relocatable (info))
3779 continue;
3780
3781 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3782 it here if it is defined in a non-shared object. */
3783 if (h != NULL
3784 && h->type == STT_GNU_IFUNC
3785 && h->def_regular)
3786 {
3787 asection *plt, *gotplt, *base_got;
3788 bfd_vma plt_index;
3789 const char *name;
3790
3791 if ((input_section->flags & SEC_ALLOC) == 0)
3792 {
3793 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3794 sections because such sections are not SEC_ALLOC and
3795 thus ld.so will not process them. */
3796 if ((input_section->flags & SEC_DEBUGGING) != 0)
3797 continue;
3798 abort ();
3799 }
3800 else if (h->plt.offset == (bfd_vma) -1)
3801 abort ();
3802
3803 /* STT_GNU_IFUNC symbol must go through PLT. */
3804 if (htab->elf.splt != NULL)
3805 {
3806 plt = htab->elf.splt;
3807 gotplt = htab->elf.sgotplt;
3808 }
3809 else
3810 {
3811 plt = htab->elf.iplt;
3812 gotplt = htab->elf.igotplt;
3813 }
3814
3815 relocation = (plt->output_section->vma
3816 + plt->output_offset + h->plt.offset);
3817
3818 switch (r_type)
3819 {
3820 default:
3821 if (h->root.root.string)
3822 name = h->root.root.string;
3823 else
3824 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3825 NULL);
3826 (*_bfd_error_handler)
3827 (_("%B: relocation %s against STT_GNU_IFUNC "
3828 "symbol `%s' isn't handled by %s"), input_bfd,
3829 elf_howto_table[r_type].name,
3830 name, __FUNCTION__);
3831 bfd_set_error (bfd_error_bad_value);
3832 return FALSE;
3833
3834 case R_386_32:
3835 /* Generate dynamic relcoation only when there is a
3836 non-GOT reference in a shared object. */
3837 if (bfd_link_pic (info) && h->non_got_ref)
3838 {
3839 Elf_Internal_Rela outrel;
3840 asection *sreloc;
3841 bfd_vma offset;
3842
3843 /* Need a dynamic relocation to get the real function
3844 adddress. */
3845 offset = _bfd_elf_section_offset (output_bfd,
3846 info,
3847 input_section,
3848 rel->r_offset);
3849 if (offset == (bfd_vma) -1
3850 || offset == (bfd_vma) -2)
3851 abort ();
3852
3853 outrel.r_offset = (input_section->output_section->vma
3854 + input_section->output_offset
3855 + offset);
3856
3857 if (h->dynindx == -1
3858 || h->forced_local
3859 || bfd_link_executable (info))
3860 {
3861 /* This symbol is resolved locally. */
3862 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3863 bfd_put_32 (output_bfd,
3864 (h->root.u.def.value
3865 + h->root.u.def.section->output_section->vma
3866 + h->root.u.def.section->output_offset),
3867 contents + offset);
3868 }
3869 else
3870 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3871
3872 sreloc = htab->elf.irelifunc;
3873 elf_append_rel (output_bfd, sreloc, &outrel);
3874
3875 /* If this reloc is against an external symbol, we
3876 do not want to fiddle with the addend. Otherwise,
3877 we need to include the symbol value so that it
3878 becomes an addend for the dynamic reloc. For an
3879 internal symbol, we have updated addend. */
3880 continue;
3881 }
3882 /* FALLTHROUGH */
3883 case R_386_PC32:
3884 case R_386_PLT32:
3885 goto do_relocation;
3886
3887 case R_386_GOT32:
3888 case R_386_GOT32X:
3889 base_got = htab->elf.sgot;
3890 off = h->got.offset;
3891
3892 if (base_got == NULL)
3893 abort ();
3894
3895 if (off == (bfd_vma) -1)
3896 {
3897 /* We can't use h->got.offset here to save state, or
3898 even just remember the offset, as finish_dynamic_symbol
3899 would use that as offset into .got. */
3900
3901 if (htab->elf.splt != NULL)
3902 {
3903 plt_index = h->plt.offset / plt_entry_size - 1;
3904 off = (plt_index + 3) * 4;
3905 base_got = htab->elf.sgotplt;
3906 }
3907 else
3908 {
3909 plt_index = h->plt.offset / plt_entry_size;
3910 off = plt_index * 4;
3911 base_got = htab->elf.igotplt;
3912 }
3913
3914 if (h->dynindx == -1
3915 || h->forced_local
3916 || info->symbolic)
3917 {
3918 /* This references the local defitionion. We must
3919 initialize this entry in the global offset table.
3920 Since the offset must always be a multiple of 8,
3921 we use the least significant bit to record
3922 whether we have initialized it already.
3923
3924 When doing a dynamic link, we create a .rela.got
3925 relocation entry to initialize the value. This
3926 is done in the finish_dynamic_symbol routine. */
3927 if ((off & 1) != 0)
3928 off &= ~1;
3929 else
3930 {
3931 bfd_put_32 (output_bfd, relocation,
3932 base_got->contents + off);
3933 h->got.offset |= 1;
3934 }
3935 }
3936
3937 relocation = off;
3938
3939 /* Adjust for static executables. */
3940 if (htab->elf.splt == NULL)
3941 relocation += gotplt->output_offset;
3942 }
3943 else
3944 {
3945 relocation = (base_got->output_section->vma
3946 + base_got->output_offset + off
3947 - gotplt->output_section->vma
3948 - gotplt->output_offset);
3949 /* Adjust for static executables. */
3950 if (htab->elf.splt == NULL)
3951 relocation += gotplt->output_offset;
3952 }
3953
3954 goto do_relocation;
3955
3956 case R_386_GOTOFF:
3957 relocation -= (gotplt->output_section->vma
3958 + gotplt->output_offset);
3959 goto do_relocation;
3960 }
3961 }
3962
3963 eh = (struct elf_i386_link_hash_entry *) h;
3964 switch (r_type)
3965 {
3966 case R_386_GOT32X:
3967 /* Avoid optimizing _DYNAMIC since ld.so may use its
3968 link-time address. */
3969 if (h == htab->elf.hdynamic)
3970 goto r_386_got32;
3971
3972 if (bfd_link_pic (info))
3973 {
3974 /* It is OK to convert mov to lea and convert indirect
3975 branch to direct branch. It is OK to convert adc,
3976 add, and, cmp, or, sbb, sub, test, xor only when PIC
3977 is false. */
3978 unsigned int opcode;
3979 opcode = bfd_get_8 (abfd, contents + rel->r_offset - 2);
3980 if (opcode != 0x8b && opcode != 0xff)
3981 goto r_386_got32;
3982 }
3983
3984 /* Resolve "mov GOT[(%reg)], %reg",
3985 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
3986 and "binop foo@GOT[(%reg)], %reg". */
3987 if (h == NULL
3988 || (h->plt.offset == (bfd_vma) -1
3989 && h->got.offset == (bfd_vma) -1)
3990 || htab->elf.sgotplt == NULL)
3991 abort ();
3992
3993 offplt = (htab->elf.sgotplt->output_section->vma
3994 + htab->elf.sgotplt->output_offset);
3995
3996 /* It is relative to .got.plt section. */
3997 if (h->got.offset != (bfd_vma) -1)
3998 /* Use GOT entry. */
3999 relocation = (htab->elf.sgot->output_section->vma
4000 + htab->elf.sgot->output_offset
4001 + h->got.offset - offplt);
4002 else
4003 /* Use GOTPLT entry. */
4004 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4005
4006 if (!bfd_link_pic (info))
4007 {
4008 /* If not PIC, add the .got.plt section address for
4009 baseless addressing. */
4010 unsigned int modrm;
4011 modrm = bfd_get_8 (abfd, contents + rel->r_offset - 1);
4012 if ((modrm & 0xc7) == 0x5)
4013 relocation += offplt;
4014 }
4015
4016 unresolved_reloc = FALSE;
4017 break;
4018
4019 case R_386_GOT32:
4020 r_386_got32:
4021 /* Relocation is to the entry for this symbol in the global
4022 offset table. */
4023 if (htab->elf.sgot == NULL)
4024 abort ();
4025
4026 if (h != NULL)
4027 {
4028 bfd_boolean dyn;
4029
4030 off = h->got.offset;
4031 dyn = htab->elf.dynamic_sections_created;
4032 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4033 bfd_link_pic (info),
4034 h)
4035 || (bfd_link_pic (info)
4036 && SYMBOL_REFERENCES_LOCAL (info, h))
4037 || (ELF_ST_VISIBILITY (h->other)
4038 && h->root.type == bfd_link_hash_undefweak))
4039 {
4040 /* This is actually a static link, or it is a
4041 -Bsymbolic link and the symbol is defined
4042 locally, or the symbol was forced to be local
4043 because of a version file. We must initialize
4044 this entry in the global offset table. Since the
4045 offset must always be a multiple of 4, we use the
4046 least significant bit to record whether we have
4047 initialized it already.
4048
4049 When doing a dynamic link, we create a .rel.got
4050 relocation entry to initialize the value. This
4051 is done in the finish_dynamic_symbol routine. */
4052 if ((off & 1) != 0)
4053 off &= ~1;
4054 else
4055 {
4056 bfd_put_32 (output_bfd, relocation,
4057 htab->elf.sgot->contents + off);
4058 h->got.offset |= 1;
4059 }
4060 }
4061 else
4062 unresolved_reloc = FALSE;
4063 }
4064 else
4065 {
4066 if (local_got_offsets == NULL)
4067 abort ();
4068
4069 off = local_got_offsets[r_symndx];
4070
4071 /* The offset must always be a multiple of 4. We use
4072 the least significant bit to record whether we have
4073 already generated the necessary reloc. */
4074 if ((off & 1) != 0)
4075 off &= ~1;
4076 else
4077 {
4078 bfd_put_32 (output_bfd, relocation,
4079 htab->elf.sgot->contents + off);
4080
4081 if (bfd_link_pic (info))
4082 {
4083 asection *s;
4084 Elf_Internal_Rela outrel;
4085
4086 s = htab->elf.srelgot;
4087 if (s == NULL)
4088 abort ();
4089
4090 outrel.r_offset = (htab->elf.sgot->output_section->vma
4091 + htab->elf.sgot->output_offset
4092 + off);
4093 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4094 elf_append_rel (output_bfd, s, &outrel);
4095 }
4096
4097 local_got_offsets[r_symndx] |= 1;
4098 }
4099 }
4100
4101 if (off >= (bfd_vma) -2)
4102 abort ();
4103
4104 relocation = htab->elf.sgot->output_section->vma
4105 + htab->elf.sgot->output_offset + off
4106 - htab->elf.sgotplt->output_section->vma
4107 - htab->elf.sgotplt->output_offset;
4108 break;
4109
4110 case R_386_GOTOFF:
4111 /* Relocation is relative to the start of the global offset
4112 table. */
4113
4114 /* Check to make sure it isn't a protected function or data
4115 symbol for shared library since it may not be local when
4116 used as function address or with copy relocation. We also
4117 need to make sure that a symbol is referenced locally. */
4118 if (!bfd_link_executable (info) && h)
4119 {
4120 if (!h->def_regular)
4121 {
4122 const char *v;
4123
4124 switch (ELF_ST_VISIBILITY (h->other))
4125 {
4126 case STV_HIDDEN:
4127 v = _("hidden symbol");
4128 break;
4129 case STV_INTERNAL:
4130 v = _("internal symbol");
4131 break;
4132 case STV_PROTECTED:
4133 v = _("protected symbol");
4134 break;
4135 default:
4136 v = _("symbol");
4137 break;
4138 }
4139
4140 (*_bfd_error_handler)
4141 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4142 input_bfd, v, h->root.root.string);
4143 bfd_set_error (bfd_error_bad_value);
4144 return FALSE;
4145 }
4146 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4147 && (h->type == STT_FUNC
4148 || h->type == STT_OBJECT)
4149 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4150 {
4151 (*_bfd_error_handler)
4152 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4153 input_bfd,
4154 h->type == STT_FUNC ? "function" : "data",
4155 h->root.root.string);
4156 bfd_set_error (bfd_error_bad_value);
4157 return FALSE;
4158 }
4159 }
4160
4161 /* Note that sgot is not involved in this
4162 calculation. We always want the start of .got.plt. If we
4163 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4164 permitted by the ABI, we might have to change this
4165 calculation. */
4166 relocation -= htab->elf.sgotplt->output_section->vma
4167 + htab->elf.sgotplt->output_offset;
4168 break;
4169
4170 case R_386_GOTPC:
4171 /* Use global offset table as symbol value. */
4172 relocation = htab->elf.sgotplt->output_section->vma
4173 + htab->elf.sgotplt->output_offset;
4174 unresolved_reloc = FALSE;
4175 break;
4176
4177 case R_386_PLT32:
4178 /* Relocation is to the entry for this symbol in the
4179 procedure linkage table. */
4180
4181 /* Resolve a PLT32 reloc against a local symbol directly,
4182 without using the procedure linkage table. */
4183 if (h == NULL)
4184 break;
4185
4186 if ((h->plt.offset == (bfd_vma) -1
4187 && eh->plt_got.offset == (bfd_vma) -1)
4188 || htab->elf.splt == NULL)
4189 {
4190 /* We didn't make a PLT entry for this symbol. This
4191 happens when statically linking PIC code, or when
4192 using -Bsymbolic. */
4193 break;
4194 }
4195
4196 if (h->plt.offset != (bfd_vma) -1)
4197 {
4198 resolved_plt = htab->elf.splt;
4199 plt_offset = h->plt.offset;
4200 }
4201 else
4202 {
4203 resolved_plt = htab->plt_got;
4204 plt_offset = eh->plt_got.offset;
4205 }
4206
4207 relocation = (resolved_plt->output_section->vma
4208 + resolved_plt->output_offset
4209 + plt_offset);
4210 unresolved_reloc = FALSE;
4211 break;
4212
4213 case R_386_SIZE32:
4214 /* Set to symbol size. */
4215 relocation = st_size;
4216 /* Fall through. */
4217
4218 case R_386_32:
4219 case R_386_PC32:
4220 if ((input_section->flags & SEC_ALLOC) == 0
4221 || is_vxworks_tls)
4222 break;
4223
4224 /* Copy dynamic function pointer relocations. */
4225 if ((bfd_link_pic (info)
4226 && (h == NULL
4227 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4228 || h->root.type != bfd_link_hash_undefweak)
4229 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4230 || !SYMBOL_CALLS_LOCAL (info, h)))
4231 || (ELIMINATE_COPY_RELOCS
4232 && !bfd_link_pic (info)
4233 && h != NULL
4234 && h->dynindx != -1
4235 && (!h->non_got_ref || eh->func_pointer_refcount > 0)
4236 && ((h->def_dynamic
4237 && !h->def_regular)
4238 || h->root.type == bfd_link_hash_undefweak
4239 || h->root.type == bfd_link_hash_undefined)))
4240 {
4241 Elf_Internal_Rela outrel;
4242 bfd_boolean skip, relocate;
4243 asection *sreloc;
4244
4245 /* When generating a shared object, these relocations
4246 are copied into the output file to be resolved at run
4247 time. */
4248
4249 skip = FALSE;
4250 relocate = FALSE;
4251
4252 outrel.r_offset =
4253 _bfd_elf_section_offset (output_bfd, info, input_section,
4254 rel->r_offset);
4255 if (outrel.r_offset == (bfd_vma) -1)
4256 skip = TRUE;
4257 else if (outrel.r_offset == (bfd_vma) -2)
4258 skip = TRUE, relocate = TRUE;
4259 outrel.r_offset += (input_section->output_section->vma
4260 + input_section->output_offset);
4261
4262 if (skip)
4263 memset (&outrel, 0, sizeof outrel);
4264 else if (h != NULL
4265 && h->dynindx != -1
4266 && (r_type == R_386_PC32
4267 || !bfd_link_pic (info)
4268 || !SYMBOLIC_BIND (info, h)
4269 || !h->def_regular))
4270 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4271 else
4272 {
4273 /* This symbol is local, or marked to become local. */
4274 relocate = TRUE;
4275 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4276 }
4277
4278 sreloc = elf_section_data (input_section)->sreloc;
4279
4280 if (sreloc == NULL || sreloc->contents == NULL)
4281 {
4282 r = bfd_reloc_notsupported;
4283 goto check_relocation_error;
4284 }
4285
4286 elf_append_rel (output_bfd, sreloc, &outrel);
4287
4288 /* If this reloc is against an external symbol, we do
4289 not want to fiddle with the addend. Otherwise, we
4290 need to include the symbol value so that it becomes
4291 an addend for the dynamic reloc. */
4292 if (! relocate)
4293 continue;
4294 }
4295 break;
4296
4297 case R_386_TLS_IE:
4298 if (!bfd_link_executable (info))
4299 {
4300 Elf_Internal_Rela outrel;
4301 asection *sreloc;
4302
4303 outrel.r_offset = rel->r_offset
4304 + input_section->output_section->vma
4305 + input_section->output_offset;
4306 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4307 sreloc = elf_section_data (input_section)->sreloc;
4308 if (sreloc == NULL)
4309 abort ();
4310 elf_append_rel (output_bfd, sreloc, &outrel);
4311 }
4312 /* Fall through */
4313
4314 case R_386_TLS_GD:
4315 case R_386_TLS_GOTDESC:
4316 case R_386_TLS_DESC_CALL:
4317 case R_386_TLS_IE_32:
4318 case R_386_TLS_GOTIE:
4319 tls_type = GOT_UNKNOWN;
4320 if (h == NULL && local_got_offsets)
4321 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4322 else if (h != NULL)
4323 tls_type = elf_i386_hash_entry(h)->tls_type;
4324 if (tls_type == GOT_TLS_IE)
4325 tls_type = GOT_TLS_IE_NEG;
4326
4327 if (! elf_i386_tls_transition (info, input_bfd,
4328 input_section, contents,
4329 symtab_hdr, sym_hashes,
4330 &r_type, tls_type, rel,
4331 relend, h, r_symndx))
4332 return FALSE;
4333
4334 if (r_type == R_386_TLS_LE_32)
4335 {
4336 BFD_ASSERT (! unresolved_reloc);
4337 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4338 {
4339 unsigned int type;
4340 bfd_vma roff;
4341
4342 /* GD->LE transition. */
4343 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4344 if (type == 0x04)
4345 {
4346 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4347 Change it into:
4348 movl %gs:0, %eax; subl $foo@tpoff, %eax
4349 (6 byte form of subl). */
4350 memcpy (contents + rel->r_offset - 3,
4351 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4352 roff = rel->r_offset + 5;
4353 }
4354 else
4355 {
4356 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4357 Change it into:
4358 movl %gs:0, %eax; subl $foo@tpoff, %eax
4359 (6 byte form of subl). */
4360 memcpy (contents + rel->r_offset - 2,
4361 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4362 roff = rel->r_offset + 6;
4363 }
4364 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4365 contents + roff);
4366 /* Skip R_386_PC32/R_386_PLT32. */
4367 rel++;
4368 continue;
4369 }
4370 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4371 {
4372 /* GDesc -> LE transition.
4373 It's originally something like:
4374 leal x@tlsdesc(%ebx), %eax
4375
4376 leal x@ntpoff, %eax
4377
4378 Registers other than %eax may be set up here. */
4379
4380 unsigned int val;
4381 bfd_vma roff;
4382
4383 roff = rel->r_offset;
4384 val = bfd_get_8 (input_bfd, contents + roff - 1);
4385
4386 /* Now modify the instruction as appropriate. */
4387 /* aoliva FIXME: remove the above and xor the byte
4388 below with 0x86. */
4389 bfd_put_8 (output_bfd, val ^ 0x86,
4390 contents + roff - 1);
4391 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4392 contents + roff);
4393 continue;
4394 }
4395 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4396 {
4397 /* GDesc -> LE transition.
4398 It's originally:
4399 call *(%eax)
4400 Turn it into:
4401 xchg %ax,%ax */
4402
4403 bfd_vma roff;
4404
4405 roff = rel->r_offset;
4406 bfd_put_8 (output_bfd, 0x66, contents + roff);
4407 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4408 continue;
4409 }
4410 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4411 {
4412 unsigned int val;
4413
4414 /* IE->LE transition:
4415 Originally it can be one of:
4416 movl foo, %eax
4417 movl foo, %reg
4418 addl foo, %reg
4419 We change it into:
4420 movl $foo, %eax
4421 movl $foo, %reg
4422 addl $foo, %reg. */
4423 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4424 if (val == 0xa1)
4425 {
4426 /* movl foo, %eax. */
4427 bfd_put_8 (output_bfd, 0xb8,
4428 contents + rel->r_offset - 1);
4429 }
4430 else
4431 {
4432 unsigned int type;
4433
4434 type = bfd_get_8 (input_bfd,
4435 contents + rel->r_offset - 2);
4436 switch (type)
4437 {
4438 case 0x8b:
4439 /* movl */
4440 bfd_put_8 (output_bfd, 0xc7,
4441 contents + rel->r_offset - 2);
4442 bfd_put_8 (output_bfd,
4443 0xc0 | ((val >> 3) & 7),
4444 contents + rel->r_offset - 1);
4445 break;
4446 case 0x03:
4447 /* addl */
4448 bfd_put_8 (output_bfd, 0x81,
4449 contents + rel->r_offset - 2);
4450 bfd_put_8 (output_bfd,
4451 0xc0 | ((val >> 3) & 7),
4452 contents + rel->r_offset - 1);
4453 break;
4454 default:
4455 BFD_FAIL ();
4456 break;
4457 }
4458 }
4459 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4460 contents + rel->r_offset);
4461 continue;
4462 }
4463 else
4464 {
4465 unsigned int val, type;
4466
4467 /* {IE_32,GOTIE}->LE transition:
4468 Originally it can be one of:
4469 subl foo(%reg1), %reg2
4470 movl foo(%reg1), %reg2
4471 addl foo(%reg1), %reg2
4472 We change it into:
4473 subl $foo, %reg2
4474 movl $foo, %reg2 (6 byte form)
4475 addl $foo, %reg2. */
4476 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4477 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4478 if (type == 0x8b)
4479 {
4480 /* movl */
4481 bfd_put_8 (output_bfd, 0xc7,
4482 contents + rel->r_offset - 2);
4483 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4484 contents + rel->r_offset - 1);
4485 }
4486 else if (type == 0x2b)
4487 {
4488 /* subl */
4489 bfd_put_8 (output_bfd, 0x81,
4490 contents + rel->r_offset - 2);
4491 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4492 contents + rel->r_offset - 1);
4493 }
4494 else if (type == 0x03)
4495 {
4496 /* addl */
4497 bfd_put_8 (output_bfd, 0x81,
4498 contents + rel->r_offset - 2);
4499 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4500 contents + rel->r_offset - 1);
4501 }
4502 else
4503 BFD_FAIL ();
4504 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4505 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4506 contents + rel->r_offset);
4507 else
4508 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4509 contents + rel->r_offset);
4510 continue;
4511 }
4512 }
4513
4514 if (htab->elf.sgot == NULL)
4515 abort ();
4516
4517 if (h != NULL)
4518 {
4519 off = h->got.offset;
4520 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4521 }
4522 else
4523 {
4524 if (local_got_offsets == NULL)
4525 abort ();
4526
4527 off = local_got_offsets[r_symndx];
4528 offplt = local_tlsdesc_gotents[r_symndx];
4529 }
4530
4531 if ((off & 1) != 0)
4532 off &= ~1;
4533 else
4534 {
4535 Elf_Internal_Rela outrel;
4536 int dr_type;
4537 asection *sreloc;
4538
4539 if (htab->elf.srelgot == NULL)
4540 abort ();
4541
4542 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4543
4544 if (GOT_TLS_GDESC_P (tls_type))
4545 {
4546 bfd_byte *loc;
4547 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4548 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4549 <= htab->elf.sgotplt->size);
4550 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4551 + htab->elf.sgotplt->output_offset
4552 + offplt
4553 + htab->sgotplt_jump_table_size);
4554 sreloc = htab->elf.srelplt;
4555 loc = sreloc->contents;
4556 loc += (htab->next_tls_desc_index++
4557 * sizeof (Elf32_External_Rel));
4558 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4559 <= sreloc->contents + sreloc->size);
4560 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4561 if (indx == 0)
4562 {
4563 BFD_ASSERT (! unresolved_reloc);
4564 bfd_put_32 (output_bfd,
4565 relocation - elf_i386_dtpoff_base (info),
4566 htab->elf.sgotplt->contents + offplt
4567 + htab->sgotplt_jump_table_size + 4);
4568 }
4569 else
4570 {
4571 bfd_put_32 (output_bfd, 0,
4572 htab->elf.sgotplt->contents + offplt
4573 + htab->sgotplt_jump_table_size + 4);
4574 }
4575 }
4576
4577 sreloc = htab->elf.srelgot;
4578
4579 outrel.r_offset = (htab->elf.sgot->output_section->vma
4580 + htab->elf.sgot->output_offset + off);
4581
4582 if (GOT_TLS_GD_P (tls_type))
4583 dr_type = R_386_TLS_DTPMOD32;
4584 else if (GOT_TLS_GDESC_P (tls_type))
4585 goto dr_done;
4586 else if (tls_type == GOT_TLS_IE_POS)
4587 dr_type = R_386_TLS_TPOFF;
4588 else
4589 dr_type = R_386_TLS_TPOFF32;
4590
4591 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4592 bfd_put_32 (output_bfd,
4593 relocation - elf_i386_dtpoff_base (info),
4594 htab->elf.sgot->contents + off);
4595 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4596 bfd_put_32 (output_bfd,
4597 elf_i386_dtpoff_base (info) - relocation,
4598 htab->elf.sgot->contents + off);
4599 else if (dr_type != R_386_TLS_DESC)
4600 bfd_put_32 (output_bfd, 0,
4601 htab->elf.sgot->contents + off);
4602 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4603
4604 elf_append_rel (output_bfd, sreloc, &outrel);
4605
4606 if (GOT_TLS_GD_P (tls_type))
4607 {
4608 if (indx == 0)
4609 {
4610 BFD_ASSERT (! unresolved_reloc);
4611 bfd_put_32 (output_bfd,
4612 relocation - elf_i386_dtpoff_base (info),
4613 htab->elf.sgot->contents + off + 4);
4614 }
4615 else
4616 {
4617 bfd_put_32 (output_bfd, 0,
4618 htab->elf.sgot->contents + off + 4);
4619 outrel.r_info = ELF32_R_INFO (indx,
4620 R_386_TLS_DTPOFF32);
4621 outrel.r_offset += 4;
4622 elf_append_rel (output_bfd, sreloc, &outrel);
4623 }
4624 }
4625 else if (tls_type == GOT_TLS_IE_BOTH)
4626 {
4627 bfd_put_32 (output_bfd,
4628 (indx == 0
4629 ? relocation - elf_i386_dtpoff_base (info)
4630 : 0),
4631 htab->elf.sgot->contents + off + 4);
4632 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4633 outrel.r_offset += 4;
4634 elf_append_rel (output_bfd, sreloc, &outrel);
4635 }
4636
4637 dr_done:
4638 if (h != NULL)
4639 h->got.offset |= 1;
4640 else
4641 local_got_offsets[r_symndx] |= 1;
4642 }
4643
4644 if (off >= (bfd_vma) -2
4645 && ! GOT_TLS_GDESC_P (tls_type))
4646 abort ();
4647 if (r_type == R_386_TLS_GOTDESC
4648 || r_type == R_386_TLS_DESC_CALL)
4649 {
4650 relocation = htab->sgotplt_jump_table_size + offplt;
4651 unresolved_reloc = FALSE;
4652 }
4653 else if (r_type == ELF32_R_TYPE (rel->r_info))
4654 {
4655 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4656 + htab->elf.sgotplt->output_offset;
4657 relocation = htab->elf.sgot->output_section->vma
4658 + htab->elf.sgot->output_offset + off - g_o_t;
4659 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4660 && tls_type == GOT_TLS_IE_BOTH)
4661 relocation += 4;
4662 if (r_type == R_386_TLS_IE)
4663 relocation += g_o_t;
4664 unresolved_reloc = FALSE;
4665 }
4666 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4667 {
4668 unsigned int val, type;
4669 bfd_vma roff;
4670
4671 /* GD->IE transition. */
4672 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4673 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4674 if (type == 0x04)
4675 {
4676 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4677 Change it into:
4678 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4679 val >>= 3;
4680 roff = rel->r_offset - 3;
4681 }
4682 else
4683 {
4684 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4685 Change it into:
4686 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4687 roff = rel->r_offset - 2;
4688 }
4689 memcpy (contents + roff,
4690 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4691 contents[roff + 7] = 0x80 | (val & 7);
4692 /* If foo is used only with foo@gotntpoff(%reg) and
4693 foo@indntpoff, but not with foo@gottpoff(%reg), change
4694 subl $foo@gottpoff(%reg), %eax
4695 into:
4696 addl $foo@gotntpoff(%reg), %eax. */
4697 if (tls_type == GOT_TLS_IE_POS)
4698 contents[roff + 6] = 0x03;
4699 bfd_put_32 (output_bfd,
4700 htab->elf.sgot->output_section->vma
4701 + htab->elf.sgot->output_offset + off
4702 - htab->elf.sgotplt->output_section->vma
4703 - htab->elf.sgotplt->output_offset,
4704 contents + roff + 8);
4705 /* Skip R_386_PLT32. */
4706 rel++;
4707 continue;
4708 }
4709 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4710 {
4711 /* GDesc -> IE transition.
4712 It's originally something like:
4713 leal x@tlsdesc(%ebx), %eax
4714
4715 Change it to:
4716 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4717 or:
4718 movl x@gottpoff(%ebx), %eax # before negl %eax
4719
4720 Registers other than %eax may be set up here. */
4721
4722 bfd_vma roff;
4723
4724 /* First, make sure it's a leal adding ebx to a 32-bit
4725 offset into any register, although it's probably
4726 almost always going to be eax. */
4727 roff = rel->r_offset;
4728
4729 /* Now modify the instruction as appropriate. */
4730 /* To turn a leal into a movl in the form we use it, it
4731 suffices to change the first byte from 0x8d to 0x8b.
4732 aoliva FIXME: should we decide to keep the leal, all
4733 we have to do is remove the statement below, and
4734 adjust the relaxation of R_386_TLS_DESC_CALL. */
4735 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4736
4737 if (tls_type == GOT_TLS_IE_BOTH)
4738 off += 4;
4739
4740 bfd_put_32 (output_bfd,
4741 htab->elf.sgot->output_section->vma
4742 + htab->elf.sgot->output_offset + off
4743 - htab->elf.sgotplt->output_section->vma
4744 - htab->elf.sgotplt->output_offset,
4745 contents + roff);
4746 continue;
4747 }
4748 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4749 {
4750 /* GDesc -> IE transition.
4751 It's originally:
4752 call *(%eax)
4753
4754 Change it to:
4755 xchg %ax,%ax
4756 or
4757 negl %eax
4758 depending on how we transformed the TLS_GOTDESC above.
4759 */
4760
4761 bfd_vma roff;
4762
4763 roff = rel->r_offset;
4764
4765 /* Now modify the instruction as appropriate. */
4766 if (tls_type != GOT_TLS_IE_NEG)
4767 {
4768 /* xchg %ax,%ax */
4769 bfd_put_8 (output_bfd, 0x66, contents + roff);
4770 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4771 }
4772 else
4773 {
4774 /* negl %eax */
4775 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4776 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4777 }
4778
4779 continue;
4780 }
4781 else
4782 BFD_ASSERT (FALSE);
4783 break;
4784
4785 case R_386_TLS_LDM:
4786 if (! elf_i386_tls_transition (info, input_bfd,
4787 input_section, contents,
4788 symtab_hdr, sym_hashes,
4789 &r_type, GOT_UNKNOWN, rel,
4790 relend, h, r_symndx))
4791 return FALSE;
4792
4793 if (r_type != R_386_TLS_LDM)
4794 {
4795 /* LD->LE transition:
4796 leal foo(%reg), %eax; call ___tls_get_addr.
4797 We change it into:
4798 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4799 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4800 memcpy (contents + rel->r_offset - 2,
4801 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4802 /* Skip R_386_PC32/R_386_PLT32. */
4803 rel++;
4804 continue;
4805 }
4806
4807 if (htab->elf.sgot == NULL)
4808 abort ();
4809
4810 off = htab->tls_ldm_got.offset;
4811 if (off & 1)
4812 off &= ~1;
4813 else
4814 {
4815 Elf_Internal_Rela outrel;
4816
4817 if (htab->elf.srelgot == NULL)
4818 abort ();
4819
4820 outrel.r_offset = (htab->elf.sgot->output_section->vma
4821 + htab->elf.sgot->output_offset + off);
4822
4823 bfd_put_32 (output_bfd, 0,
4824 htab->elf.sgot->contents + off);
4825 bfd_put_32 (output_bfd, 0,
4826 htab->elf.sgot->contents + off + 4);
4827 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4828 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4829 htab->tls_ldm_got.offset |= 1;
4830 }
4831 relocation = htab->elf.sgot->output_section->vma
4832 + htab->elf.sgot->output_offset + off
4833 - htab->elf.sgotplt->output_section->vma
4834 - htab->elf.sgotplt->output_offset;
4835 unresolved_reloc = FALSE;
4836 break;
4837
4838 case R_386_TLS_LDO_32:
4839 if (!bfd_link_executable (info)
4840 || (input_section->flags & SEC_CODE) == 0)
4841 relocation -= elf_i386_dtpoff_base (info);
4842 else
4843 /* When converting LDO to LE, we must negate. */
4844 relocation = -elf_i386_tpoff (info, relocation);
4845 break;
4846
4847 case R_386_TLS_LE_32:
4848 case R_386_TLS_LE:
4849 if (!bfd_link_executable (info))
4850 {
4851 Elf_Internal_Rela outrel;
4852 asection *sreloc;
4853
4854 outrel.r_offset = rel->r_offset
4855 + input_section->output_section->vma
4856 + input_section->output_offset;
4857 if (h != NULL && h->dynindx != -1)
4858 indx = h->dynindx;
4859 else
4860 indx = 0;
4861 if (r_type == R_386_TLS_LE_32)
4862 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4863 else
4864 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4865 sreloc = elf_section_data (input_section)->sreloc;
4866 if (sreloc == NULL)
4867 abort ();
4868 elf_append_rel (output_bfd, sreloc, &outrel);
4869 if (indx)
4870 continue;
4871 else if (r_type == R_386_TLS_LE_32)
4872 relocation = elf_i386_dtpoff_base (info) - relocation;
4873 else
4874 relocation -= elf_i386_dtpoff_base (info);
4875 }
4876 else if (r_type == R_386_TLS_LE_32)
4877 relocation = elf_i386_tpoff (info, relocation);
4878 else
4879 relocation = -elf_i386_tpoff (info, relocation);
4880 break;
4881
4882 default:
4883 break;
4884 }
4885
4886 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4887 because such sections are not SEC_ALLOC and thus ld.so will
4888 not process them. */
4889 if (unresolved_reloc
4890 && !((input_section->flags & SEC_DEBUGGING) != 0
4891 && h->def_dynamic)
4892 && _bfd_elf_section_offset (output_bfd, info, input_section,
4893 rel->r_offset) != (bfd_vma) -1)
4894 {
4895 (*_bfd_error_handler)
4896 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4897 input_bfd,
4898 input_section,
4899 (long) rel->r_offset,
4900 howto->name,
4901 h->root.root.string);
4902 return FALSE;
4903 }
4904
4905 do_relocation:
4906 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4907 contents, rel->r_offset,
4908 relocation, 0);
4909
4910 check_relocation_error:
4911 if (r != bfd_reloc_ok)
4912 {
4913 const char *name;
4914
4915 if (h != NULL)
4916 name = h->root.root.string;
4917 else
4918 {
4919 name = bfd_elf_string_from_elf_section (input_bfd,
4920 symtab_hdr->sh_link,
4921 sym->st_name);
4922 if (name == NULL)
4923 return FALSE;
4924 if (*name == '\0')
4925 name = bfd_section_name (input_bfd, sec);
4926 }
4927
4928 if (r == bfd_reloc_overflow)
4929 {
4930 if (! ((*info->callbacks->reloc_overflow)
4931 (info, (h ? &h->root : NULL), name, howto->name,
4932 (bfd_vma) 0, input_bfd, input_section,
4933 rel->r_offset)))
4934 return FALSE;
4935 }
4936 else
4937 {
4938 (*_bfd_error_handler)
4939 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4940 input_bfd, input_section,
4941 (long) rel->r_offset, name, (int) r);
4942 return FALSE;
4943 }
4944 }
4945 }
4946
4947 return TRUE;
4948 }
4949
4950 /* Finish up dynamic symbol handling. We set the contents of various
4951 dynamic sections here. */
4952
4953 static bfd_boolean
4954 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4955 struct bfd_link_info *info,
4956 struct elf_link_hash_entry *h,
4957 Elf_Internal_Sym *sym)
4958 {
4959 struct elf_i386_link_hash_table *htab;
4960 unsigned plt_entry_size;
4961 const struct elf_i386_backend_data *abed;
4962 struct elf_i386_link_hash_entry *eh;
4963
4964 htab = elf_i386_hash_table (info);
4965 if (htab == NULL)
4966 return FALSE;
4967
4968 abed = get_elf_i386_backend_data (output_bfd);
4969 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4970
4971 eh = (struct elf_i386_link_hash_entry *) h;
4972
4973 if (h->plt.offset != (bfd_vma) -1)
4974 {
4975 bfd_vma plt_index;
4976 bfd_vma got_offset;
4977 Elf_Internal_Rela rel;
4978 bfd_byte *loc;
4979 asection *plt, *gotplt, *relplt;
4980
4981 /* When building a static executable, use .iplt, .igot.plt and
4982 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4983 if (htab->elf.splt != NULL)
4984 {
4985 plt = htab->elf.splt;
4986 gotplt = htab->elf.sgotplt;
4987 relplt = htab->elf.srelplt;
4988 }
4989 else
4990 {
4991 plt = htab->elf.iplt;
4992 gotplt = htab->elf.igotplt;
4993 relplt = htab->elf.irelplt;
4994 }
4995
4996 /* This symbol has an entry in the procedure linkage table. Set
4997 it up. */
4998
4999 if ((h->dynindx == -1
5000 && !((h->forced_local || bfd_link_executable (info))
5001 && h->def_regular
5002 && h->type == STT_GNU_IFUNC))
5003 || plt == NULL
5004 || gotplt == NULL
5005 || relplt == NULL)
5006 abort ();
5007
5008 /* Get the index in the procedure linkage table which
5009 corresponds to this symbol. This is the index of this symbol
5010 in all the symbols for which we are making plt entries. The
5011 first entry in the procedure linkage table is reserved.
5012
5013 Get the offset into the .got table of the entry that
5014 corresponds to this function. Each .got entry is 4 bytes.
5015 The first three are reserved.
5016
5017 For static executables, we don't reserve anything. */
5018
5019 if (plt == htab->elf.splt)
5020 {
5021 got_offset = h->plt.offset / plt_entry_size - 1;
5022 got_offset = (got_offset + 3) * 4;
5023 }
5024 else
5025 {
5026 got_offset = h->plt.offset / plt_entry_size;
5027 got_offset = got_offset * 4;
5028 }
5029
5030 /* Fill in the entry in the procedure linkage table. */
5031 if (! bfd_link_pic (info))
5032 {
5033 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5034 abed->plt->plt_entry_size);
5035 bfd_put_32 (output_bfd,
5036 (gotplt->output_section->vma
5037 + gotplt->output_offset
5038 + got_offset),
5039 plt->contents + h->plt.offset
5040 + abed->plt->plt_got_offset);
5041
5042 if (abed->is_vxworks)
5043 {
5044 int s, k, reloc_index;
5045
5046 /* Create the R_386_32 relocation referencing the GOT
5047 for this PLT entry. */
5048
5049 /* S: Current slot number (zero-based). */
5050 s = ((h->plt.offset - abed->plt->plt_entry_size)
5051 / abed->plt->plt_entry_size);
5052 /* K: Number of relocations for PLTResolve. */
5053 if (bfd_link_pic (info))
5054 k = PLTRESOLVE_RELOCS_SHLIB;
5055 else
5056 k = PLTRESOLVE_RELOCS;
5057 /* Skip the PLTresolve relocations, and the relocations for
5058 the other PLT slots. */
5059 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5060 loc = (htab->srelplt2->contents + reloc_index
5061 * sizeof (Elf32_External_Rel));
5062
5063 rel.r_offset = (htab->elf.splt->output_section->vma
5064 + htab->elf.splt->output_offset
5065 + h->plt.offset + 2),
5066 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5067 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5068
5069 /* Create the R_386_32 relocation referencing the beginning of
5070 the PLT for this GOT entry. */
5071 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5072 + htab->elf.sgotplt->output_offset
5073 + got_offset);
5074 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5075 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5076 loc + sizeof (Elf32_External_Rel));
5077 }
5078 }
5079 else
5080 {
5081 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5082 abed->plt->plt_entry_size);
5083 bfd_put_32 (output_bfd, got_offset,
5084 plt->contents + h->plt.offset
5085 + abed->plt->plt_got_offset);
5086 }
5087
5088 /* Fill in the entry in the global offset table. */
5089 bfd_put_32 (output_bfd,
5090 (plt->output_section->vma
5091 + plt->output_offset
5092 + h->plt.offset
5093 + abed->plt->plt_lazy_offset),
5094 gotplt->contents + got_offset);
5095
5096 /* Fill in the entry in the .rel.plt section. */
5097 rel.r_offset = (gotplt->output_section->vma
5098 + gotplt->output_offset
5099 + got_offset);
5100 if (h->dynindx == -1
5101 || ((bfd_link_executable (info)
5102 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5103 && h->def_regular
5104 && h->type == STT_GNU_IFUNC))
5105 {
5106 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5107 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5108 in the .got.plt section. */
5109 bfd_put_32 (output_bfd,
5110 (h->root.u.def.value
5111 + h->root.u.def.section->output_section->vma
5112 + h->root.u.def.section->output_offset),
5113 gotplt->contents + got_offset);
5114 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5115 /* R_386_IRELATIVE comes last. */
5116 plt_index = htab->next_irelative_index--;
5117 }
5118 else
5119 {
5120 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5121 plt_index = htab->next_jump_slot_index++;
5122 }
5123 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5124 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5125
5126 /* Don't fill PLT entry for static executables. */
5127 if (plt == htab->elf.splt)
5128 {
5129 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
5130 plt->contents + h->plt.offset
5131 + abed->plt->plt_reloc_offset);
5132 bfd_put_32 (output_bfd, - (h->plt.offset
5133 + abed->plt->plt_plt_offset + 4),
5134 plt->contents + h->plt.offset
5135 + abed->plt->plt_plt_offset);
5136 }
5137 }
5138 else if (eh->plt_got.offset != (bfd_vma) -1)
5139 {
5140 bfd_vma got_offset, plt_offset;
5141 asection *plt, *got, *gotplt;
5142 const bfd_byte *got_plt_entry;
5143
5144 /* Offset of displacement of the indirect jump. */
5145 bfd_vma plt_got_offset = 2;
5146
5147 /* Set the entry in the GOT procedure linkage table. */
5148 plt = htab->plt_got;
5149 got = htab->elf.sgot;
5150 gotplt = htab->elf.sgotplt;
5151 got_offset = h->got.offset;
5152
5153 if (got_offset == (bfd_vma) -1
5154 || plt == NULL
5155 || got == NULL
5156 || gotplt == NULL)
5157 abort ();
5158
5159 /* Fill in the entry in the GOT procedure linkage table. */
5160 if (! bfd_link_pic (info))
5161 {
5162 got_plt_entry = elf_i386_got_plt_entry;
5163 got_offset += got->output_section->vma + got->output_offset;
5164 }
5165 else
5166 {
5167 got_plt_entry = elf_i386_pic_got_plt_entry;
5168 got_offset += (got->output_section->vma
5169 + got->output_offset
5170 - gotplt->output_section->vma
5171 - gotplt->output_offset);
5172 }
5173
5174 plt_offset = eh->plt_got.offset;
5175 memcpy (plt->contents + plt_offset, got_plt_entry,
5176 sizeof (elf_i386_got_plt_entry));
5177 bfd_put_32 (output_bfd, got_offset,
5178 plt->contents + plt_offset + plt_got_offset);
5179 }
5180
5181 if (!h->def_regular
5182 && (h->plt.offset != (bfd_vma) -1
5183 || eh->plt_got.offset != (bfd_vma) -1))
5184 {
5185 /* Mark the symbol as undefined, rather than as defined in
5186 the .plt section. Leave the value if there were any
5187 relocations where pointer equality matters (this is a clue
5188 for the dynamic linker, to make function pointer
5189 comparisons work between an application and shared
5190 library), otherwise set it to zero. If a function is only
5191 called from a binary, there is no need to slow down
5192 shared libraries because of that. */
5193 sym->st_shndx = SHN_UNDEF;
5194 if (!h->pointer_equality_needed)
5195 sym->st_value = 0;
5196 }
5197
5198 if (h->got.offset != (bfd_vma) -1
5199 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5200 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
5201 {
5202 Elf_Internal_Rela rel;
5203
5204 /* This symbol has an entry in the global offset table. Set it
5205 up. */
5206
5207 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5208 abort ();
5209
5210 rel.r_offset = (htab->elf.sgot->output_section->vma
5211 + htab->elf.sgot->output_offset
5212 + (h->got.offset & ~(bfd_vma) 1));
5213
5214 /* If this is a static link, or it is a -Bsymbolic link and the
5215 symbol is defined locally or was forced to be local because
5216 of a version file, we just want to emit a RELATIVE reloc.
5217 The entry in the global offset table will already have been
5218 initialized in the relocate_section function. */
5219 if (h->def_regular
5220 && h->type == STT_GNU_IFUNC)
5221 {
5222 if (bfd_link_pic (info))
5223 {
5224 /* Generate R_386_GLOB_DAT. */
5225 goto do_glob_dat;
5226 }
5227 else
5228 {
5229 asection *plt;
5230
5231 if (!h->pointer_equality_needed)
5232 abort ();
5233
5234 /* For non-shared object, we can't use .got.plt, which
5235 contains the real function addres if we need pointer
5236 equality. We load the GOT entry with the PLT entry. */
5237 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5238 bfd_put_32 (output_bfd,
5239 (plt->output_section->vma
5240 + plt->output_offset + h->plt.offset),
5241 htab->elf.sgot->contents + h->got.offset);
5242 return TRUE;
5243 }
5244 }
5245 else if (bfd_link_pic (info)
5246 && SYMBOL_REFERENCES_LOCAL (info, h))
5247 {
5248 BFD_ASSERT((h->got.offset & 1) != 0);
5249 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5250 }
5251 else
5252 {
5253 BFD_ASSERT((h->got.offset & 1) == 0);
5254 do_glob_dat:
5255 bfd_put_32 (output_bfd, (bfd_vma) 0,
5256 htab->elf.sgot->contents + h->got.offset);
5257 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5258 }
5259
5260 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5261 }
5262
5263 if (h->needs_copy)
5264 {
5265 Elf_Internal_Rela rel;
5266
5267 /* This symbol needs a copy reloc. Set it up. */
5268
5269 if (h->dynindx == -1
5270 || (h->root.type != bfd_link_hash_defined
5271 && h->root.type != bfd_link_hash_defweak)
5272 || htab->srelbss == NULL)
5273 abort ();
5274
5275 rel.r_offset = (h->root.u.def.value
5276 + h->root.u.def.section->output_section->vma
5277 + h->root.u.def.section->output_offset);
5278 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5279 elf_append_rel (output_bfd, htab->srelbss, &rel);
5280 }
5281
5282 return TRUE;
5283 }
5284
5285 /* Finish up local dynamic symbol handling. We set the contents of
5286 various dynamic sections here. */
5287
5288 static bfd_boolean
5289 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5290 {
5291 struct elf_link_hash_entry *h
5292 = (struct elf_link_hash_entry *) *slot;
5293 struct bfd_link_info *info
5294 = (struct bfd_link_info *) inf;
5295
5296 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5297 h, NULL);
5298 }
5299
5300 /* Used to decide how to sort relocs in an optimal manner for the
5301 dynamic linker, before writing them out. */
5302
5303 static enum elf_reloc_type_class
5304 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5305 const asection *rel_sec ATTRIBUTE_UNUSED,
5306 const Elf_Internal_Rela *rela)
5307 {
5308 bfd *abfd = info->output_bfd;
5309 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5310 struct elf_link_hash_table *htab = elf_hash_table (info);
5311 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5312 Elf_Internal_Sym sym;
5313
5314 if (htab->dynsym == NULL
5315 || !bed->s->swap_symbol_in (abfd,
5316 (htab->dynsym->contents
5317 + r_symndx * sizeof (Elf32_External_Sym)),
5318 0, &sym))
5319 abort ();
5320
5321 /* Check relocation against STT_GNU_IFUNC symbol. */
5322 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5323 return reloc_class_ifunc;
5324
5325 switch (ELF32_R_TYPE (rela->r_info))
5326 {
5327 case R_386_RELATIVE:
5328 return reloc_class_relative;
5329 case R_386_JUMP_SLOT:
5330 return reloc_class_plt;
5331 case R_386_COPY:
5332 return reloc_class_copy;
5333 default:
5334 return reloc_class_normal;
5335 }
5336 }
5337
5338 /* Finish up the dynamic sections. */
5339
5340 static bfd_boolean
5341 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5342 struct bfd_link_info *info)
5343 {
5344 struct elf_i386_link_hash_table *htab;
5345 bfd *dynobj;
5346 asection *sdyn;
5347 const struct elf_i386_backend_data *abed;
5348
5349 htab = elf_i386_hash_table (info);
5350 if (htab == NULL)
5351 return FALSE;
5352
5353 dynobj = htab->elf.dynobj;
5354 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5355 abed = get_elf_i386_backend_data (output_bfd);
5356
5357 if (htab->elf.dynamic_sections_created)
5358 {
5359 Elf32_External_Dyn *dyncon, *dynconend;
5360
5361 if (sdyn == NULL || htab->elf.sgot == NULL)
5362 abort ();
5363
5364 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5365 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5366 for (; dyncon < dynconend; dyncon++)
5367 {
5368 Elf_Internal_Dyn dyn;
5369 asection *s;
5370
5371 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5372
5373 switch (dyn.d_tag)
5374 {
5375 default:
5376 if (abed->is_vxworks
5377 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5378 break;
5379 continue;
5380
5381 case DT_PLTGOT:
5382 s = htab->elf.sgotplt;
5383 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5384 break;
5385
5386 case DT_JMPREL:
5387 s = htab->elf.srelplt;
5388 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5389 break;
5390
5391 case DT_PLTRELSZ:
5392 s = htab->elf.srelplt;
5393 dyn.d_un.d_val = s->size;
5394 break;
5395
5396 case DT_RELSZ:
5397 /* My reading of the SVR4 ABI indicates that the
5398 procedure linkage table relocs (DT_JMPREL) should be
5399 included in the overall relocs (DT_REL). This is
5400 what Solaris does. However, UnixWare can not handle
5401 that case. Therefore, we override the DT_RELSZ entry
5402 here to make it not include the JMPREL relocs. */
5403 s = htab->elf.srelplt;
5404 if (s == NULL)
5405 continue;
5406 dyn.d_un.d_val -= s->size;
5407 break;
5408
5409 case DT_REL:
5410 /* We may not be using the standard ELF linker script.
5411 If .rel.plt is the first .rel section, we adjust
5412 DT_REL to not include it. */
5413 s = htab->elf.srelplt;
5414 if (s == NULL)
5415 continue;
5416 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5417 continue;
5418 dyn.d_un.d_ptr += s->size;
5419 break;
5420 }
5421
5422 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5423 }
5424
5425 /* Fill in the first entry in the procedure linkage table. */
5426 if (htab->elf.splt && htab->elf.splt->size > 0)
5427 {
5428 if (bfd_link_pic (info))
5429 {
5430 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5431 abed->plt->plt0_entry_size);
5432 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5433 abed->plt0_pad_byte,
5434 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5435 }
5436 else
5437 {
5438 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5439 abed->plt->plt0_entry_size);
5440 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5441 abed->plt0_pad_byte,
5442 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5443 bfd_put_32 (output_bfd,
5444 (htab->elf.sgotplt->output_section->vma
5445 + htab->elf.sgotplt->output_offset
5446 + 4),
5447 htab->elf.splt->contents
5448 + abed->plt->plt0_got1_offset);
5449 bfd_put_32 (output_bfd,
5450 (htab->elf.sgotplt->output_section->vma
5451 + htab->elf.sgotplt->output_offset
5452 + 8),
5453 htab->elf.splt->contents
5454 + abed->plt->plt0_got2_offset);
5455
5456 if (abed->is_vxworks)
5457 {
5458 Elf_Internal_Rela rel;
5459
5460 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5461 On IA32 we use REL relocations so the addend goes in
5462 the PLT directly. */
5463 rel.r_offset = (htab->elf.splt->output_section->vma
5464 + htab->elf.splt->output_offset
5465 + abed->plt->plt0_got1_offset);
5466 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5467 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5468 htab->srelplt2->contents);
5469 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5470 rel.r_offset = (htab->elf.splt->output_section->vma
5471 + htab->elf.splt->output_offset
5472 + abed->plt->plt0_got2_offset);
5473 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5474 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5475 htab->srelplt2->contents +
5476 sizeof (Elf32_External_Rel));
5477 }
5478 }
5479
5480 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5481 really seem like the right value. */
5482 elf_section_data (htab->elf.splt->output_section)
5483 ->this_hdr.sh_entsize = 4;
5484
5485 /* Correct the .rel.plt.unloaded relocations. */
5486 if (abed->is_vxworks && !bfd_link_pic (info))
5487 {
5488 int num_plts = (htab->elf.splt->size
5489 / abed->plt->plt_entry_size) - 1;
5490 unsigned char *p;
5491
5492 p = htab->srelplt2->contents;
5493 if (bfd_link_pic (info))
5494 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5495 else
5496 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5497
5498 for (; num_plts; num_plts--)
5499 {
5500 Elf_Internal_Rela rel;
5501 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5502 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5503 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5504 p += sizeof (Elf32_External_Rel);
5505
5506 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5507 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5508 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5509 p += sizeof (Elf32_External_Rel);
5510 }
5511 }
5512 }
5513 }
5514
5515 if (htab->elf.sgotplt)
5516 {
5517 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5518 {
5519 (*_bfd_error_handler)
5520 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5521 return FALSE;
5522 }
5523
5524 /* Fill in the first three entries in the global offset table. */
5525 if (htab->elf.sgotplt->size > 0)
5526 {
5527 bfd_put_32 (output_bfd,
5528 (sdyn == NULL ? 0
5529 : sdyn->output_section->vma + sdyn->output_offset),
5530 htab->elf.sgotplt->contents);
5531 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5532 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5533 }
5534
5535 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5536 }
5537
5538 /* Adjust .eh_frame for .plt section. */
5539 if (htab->plt_eh_frame != NULL
5540 && htab->plt_eh_frame->contents != NULL)
5541 {
5542 if (htab->elf.splt != NULL
5543 && htab->elf.splt->size != 0
5544 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5545 && htab->elf.splt->output_section != NULL
5546 && htab->plt_eh_frame->output_section != NULL)
5547 {
5548 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5549 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5550 + htab->plt_eh_frame->output_offset
5551 + PLT_FDE_START_OFFSET;
5552 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5553 htab->plt_eh_frame->contents
5554 + PLT_FDE_START_OFFSET);
5555 }
5556 if (htab->plt_eh_frame->sec_info_type
5557 == SEC_INFO_TYPE_EH_FRAME)
5558 {
5559 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5560 htab->plt_eh_frame,
5561 htab->plt_eh_frame->contents))
5562 return FALSE;
5563 }
5564 }
5565
5566 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5567 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5568
5569 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5570 htab_traverse (htab->loc_hash_table,
5571 elf_i386_finish_local_dynamic_symbol,
5572 info);
5573
5574 return TRUE;
5575 }
5576
5577 /* Return an array of PLT entry symbol values. */
5578
5579 static bfd_vma *
5580 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5581 asection *relplt)
5582 {
5583 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5584 arelent *p;
5585 long count, i;
5586 bfd_vma *plt_sym_val;
5587 bfd_vma plt_offset;
5588 bfd_byte *plt_contents;
5589 const struct elf_i386_backend_data *bed
5590 = get_elf_i386_backend_data (abfd);
5591 Elf_Internal_Shdr *hdr;
5592
5593 /* Get the .plt section contents. */
5594 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5595 if (plt_contents == NULL)
5596 return NULL;
5597 if (!bfd_get_section_contents (abfd, (asection *) plt,
5598 plt_contents, 0, plt->size))
5599 {
5600 bad_return:
5601 free (plt_contents);
5602 return NULL;
5603 }
5604
5605 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5606 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5607 goto bad_return;
5608
5609 hdr = &elf_section_data (relplt)->this_hdr;
5610 count = relplt->size / hdr->sh_entsize;
5611
5612 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5613 if (plt_sym_val == NULL)
5614 goto bad_return;
5615
5616 for (i = 0; i < count; i++)
5617 plt_sym_val[i] = -1;
5618
5619 plt_offset = bed->plt->plt_entry_size;
5620 p = relplt->relocation;
5621 for (i = 0; i < count; i++, p++)
5622 {
5623 long reloc_index;
5624
5625 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5626 if (p->howto == NULL)
5627 continue;
5628
5629 if (p->howto->type != R_386_JUMP_SLOT
5630 && p->howto->type != R_386_IRELATIVE)
5631 continue;
5632
5633 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5634 + bed->plt->plt_reloc_offset));
5635 reloc_index /= sizeof (Elf32_External_Rel);
5636 if (reloc_index >= count)
5637 abort ();
5638 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5639 plt_offset += bed->plt->plt_entry_size;
5640
5641 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5642 section. */
5643 if (plt_offset >= plt->size)
5644 break;
5645 }
5646
5647 free (plt_contents);
5648
5649 return plt_sym_val;
5650 }
5651
5652 /* Similar to _bfd_elf_get_synthetic_symtab. */
5653
5654 static long
5655 elf_i386_get_synthetic_symtab (bfd *abfd,
5656 long symcount,
5657 asymbol **syms,
5658 long dynsymcount,
5659 asymbol **dynsyms,
5660 asymbol **ret)
5661 {
5662 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5663 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5664 dynsymcount, dynsyms, ret,
5665 plt,
5666 elf_i386_get_plt_sym_val);
5667 }
5668
5669 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5670
5671 static bfd_boolean
5672 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5673 {
5674 if (h->plt.offset != (bfd_vma) -1
5675 && !h->def_regular
5676 && !h->pointer_equality_needed)
5677 return FALSE;
5678
5679 return _bfd_elf_hash_symbol (h);
5680 }
5681
5682 /* Hook called by the linker routine which adds symbols from an object
5683 file. */
5684
5685 static bfd_boolean
5686 elf_i386_add_symbol_hook (bfd * abfd,
5687 struct bfd_link_info * info,
5688 Elf_Internal_Sym * sym,
5689 const char ** namep ATTRIBUTE_UNUSED,
5690 flagword * flagsp ATTRIBUTE_UNUSED,
5691 asection ** secp ATTRIBUTE_UNUSED,
5692 bfd_vma * valp ATTRIBUTE_UNUSED)
5693 {
5694 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5695 && (abfd->flags & DYNAMIC) == 0
5696 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5697 elf_tdata (info->output_bfd)->has_gnu_symbols
5698 |= elf_gnu_symbol_unique;
5699
5700 return TRUE;
5701 }
5702
5703 #define TARGET_LITTLE_SYM i386_elf32_vec
5704 #define TARGET_LITTLE_NAME "elf32-i386"
5705 #define ELF_ARCH bfd_arch_i386
5706 #define ELF_TARGET_ID I386_ELF_DATA
5707 #define ELF_MACHINE_CODE EM_386
5708 #define ELF_MAXPAGESIZE 0x1000
5709
5710 #define elf_backend_can_gc_sections 1
5711 #define elf_backend_can_refcount 1
5712 #define elf_backend_want_got_plt 1
5713 #define elf_backend_plt_readonly 1
5714 #define elf_backend_want_plt_sym 0
5715 #define elf_backend_got_header_size 12
5716 #define elf_backend_plt_alignment 4
5717 #define elf_backend_extern_protected_data 1
5718
5719 /* Support RELA for objdump of prelink objects. */
5720 #define elf_info_to_howto elf_i386_info_to_howto_rel
5721 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5722
5723 #define bfd_elf32_mkobject elf_i386_mkobject
5724
5725 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5726 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5727 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5728 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5729 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5730
5731 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5732 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5733 #define elf_backend_check_relocs elf_i386_check_relocs
5734 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5735 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5736 #define elf_backend_fake_sections elf_i386_fake_sections
5737 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5738 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5739 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5740 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5741 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5742 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5743 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5744 #define elf_backend_relocate_section elf_i386_relocate_section
5745 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5746 #define elf_backend_always_size_sections elf_i386_always_size_sections
5747 #define elf_backend_omit_section_dynsym \
5748 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5749 #define elf_backend_hash_symbol elf_i386_hash_symbol
5750 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5751
5752 #include "elf32-target.h"
5753
5754 /* FreeBSD support. */
5755
5756 #undef TARGET_LITTLE_SYM
5757 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5758 #undef TARGET_LITTLE_NAME
5759 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5760 #undef ELF_OSABI
5761 #define ELF_OSABI ELFOSABI_FREEBSD
5762
5763 /* The kernel recognizes executables as valid only if they carry a
5764 "FreeBSD" label in the ELF header. So we put this label on all
5765 executables and (for simplicity) also all other object files. */
5766
5767 static void
5768 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5769 {
5770 _bfd_elf_post_process_headers (abfd, info);
5771
5772 #ifdef OLD_FREEBSD_ABI_LABEL
5773 {
5774 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5775 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5776 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5777 }
5778 #endif
5779 }
5780
5781 #undef elf_backend_post_process_headers
5782 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5783 #undef elf32_bed
5784 #define elf32_bed elf32_i386_fbsd_bed
5785
5786 #undef elf_backend_add_symbol_hook
5787
5788 #include "elf32-target.h"
5789
5790 /* Solaris 2. */
5791
5792 #undef TARGET_LITTLE_SYM
5793 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5794 #undef TARGET_LITTLE_NAME
5795 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5796
5797 #undef elf_backend_post_process_headers
5798
5799 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5800 objects won't be recognized. */
5801 #undef ELF_OSABI
5802
5803 #undef elf32_bed
5804 #define elf32_bed elf32_i386_sol2_bed
5805
5806 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5807 boundary. */
5808 #undef elf_backend_static_tls_alignment
5809 #define elf_backend_static_tls_alignment 8
5810
5811 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5812
5813 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5814 File, p.63. */
5815 #undef elf_backend_want_plt_sym
5816 #define elf_backend_want_plt_sym 1
5817
5818 #include "elf32-target.h"
5819
5820 /* Intel MCU support. */
5821
5822 static bfd_boolean
5823 elf32_iamcu_elf_object_p (bfd *abfd)
5824 {
5825 /* Set the right machine number for an IAMCU elf32 file. */
5826 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5827 return TRUE;
5828 }
5829
5830 #undef TARGET_LITTLE_SYM
5831 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5832 #undef TARGET_LITTLE_NAME
5833 #define TARGET_LITTLE_NAME "elf32-iamcu"
5834 #undef ELF_ARCH
5835 #define ELF_ARCH bfd_arch_iamcu
5836
5837 #undef ELF_MACHINE_CODE
5838 #define ELF_MACHINE_CODE EM_IAMCU
5839
5840 #undef ELF_OSABI
5841
5842 #undef elf32_bed
5843 #define elf32_bed elf32_iamcu_bed
5844
5845 #undef elf_backend_object_p
5846 #define elf_backend_object_p elf32_iamcu_elf_object_p
5847
5848 #undef elf_backend_static_tls_alignment
5849
5850 #undef elf_backend_want_plt_sym
5851 #define elf_backend_want_plt_sym 0
5852
5853 #include "elf32-target.h"
5854
5855 /* Restore defaults. */
5856 #undef ELF_ARCH
5857 #define ELF_ARCH bfd_arch_i386
5858 #undef ELF_MACHINE_CODE
5859 #define ELF_MACHINE_CODE EM_386
5860
5861 /* Native Client support. */
5862
5863 #undef TARGET_LITTLE_SYM
5864 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5865 #undef TARGET_LITTLE_NAME
5866 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5867 #undef elf32_bed
5868 #define elf32_bed elf32_i386_nacl_bed
5869
5870 #undef ELF_MAXPAGESIZE
5871 #define ELF_MAXPAGESIZE 0x10000
5872
5873 /* Restore defaults. */
5874 #undef ELF_OSABI
5875 #undef elf_backend_want_plt_sym
5876 #define elf_backend_want_plt_sym 0
5877 #undef elf_backend_post_process_headers
5878 #undef elf_backend_static_tls_alignment
5879
5880 /* NaCl uses substantially different PLT entries for the same effects. */
5881
5882 #undef elf_backend_plt_alignment
5883 #define elf_backend_plt_alignment 5
5884 #define NACL_PLT_ENTRY_SIZE 64
5885 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5886
5887 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5888 {
5889 0xff, 0x35, /* pushl contents of address */
5890 0, 0, 0, 0, /* replaced with address of .got + 4. */
5891 0x8b, 0x0d, /* movl contents of address, %ecx */
5892 0, 0, 0, 0, /* replaced with address of .got + 8. */
5893 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5894 0xff, 0xe1 /* jmp *%ecx */
5895 };
5896
5897 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5898 {
5899 0x8b, 0x0d, /* movl contents of address, %ecx */
5900 0, 0, 0, 0, /* replaced with GOT slot address. */
5901 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5902 0xff, 0xe1, /* jmp *%ecx */
5903
5904 /* Pad to the next 32-byte boundary with nop instructions. */
5905 0x90,
5906 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5907 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5908
5909 /* Lazy GOT entries point here (32-byte aligned). */
5910 0x68, /* pushl immediate */
5911 0, 0, 0, 0, /* replaced with reloc offset. */
5912 0xe9, /* jmp relative */
5913 0, 0, 0, 0, /* replaced with offset to .plt. */
5914
5915 /* Pad to the next 32-byte boundary with nop instructions. */
5916 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5917 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5918 0x90, 0x90
5919 };
5920
5921 static const bfd_byte
5922 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5923 {
5924 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5925 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5926 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5927 0xff, 0xe1, /* jmp *%ecx */
5928
5929 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5930 so pad to that size with nop instructions. */
5931 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5932 };
5933
5934 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5935 {
5936 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5937 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5938 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5939 0xff, 0xe1, /* jmp *%ecx */
5940
5941 /* Pad to the next 32-byte boundary with nop instructions. */
5942 0x90,
5943 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5944 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5945
5946 /* Lazy GOT entries point here (32-byte aligned). */
5947 0x68, /* pushl immediate */
5948 0, 0, 0, 0, /* replaced with offset into relocation table. */
5949 0xe9, /* jmp relative */
5950 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5951
5952 /* Pad to the next 32-byte boundary with nop instructions. */
5953 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5954 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5955 0x90, 0x90
5956 };
5957
5958 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5959 {
5960 #if (PLT_CIE_LENGTH != 20 \
5961 || PLT_FDE_LENGTH != 36 \
5962 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5963 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5964 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5965 #endif
5966 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5967 0, 0, 0, 0, /* CIE ID */
5968 1, /* CIE version */
5969 'z', 'R', 0, /* Augmentation string */
5970 1, /* Code alignment factor */
5971 0x7c, /* Data alignment factor: -4 */
5972 8, /* Return address column */
5973 1, /* Augmentation size */
5974 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5975 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5976 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5977 DW_CFA_nop, DW_CFA_nop,
5978
5979 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5980 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5981 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5982 0, 0, 0, 0, /* .plt size goes here */
5983 0, /* Augmentation size */
5984 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5985 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5986 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5987 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5988 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5989 13, /* Block length */
5990 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5991 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5992 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5993 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5994 DW_CFA_nop, DW_CFA_nop
5995 };
5996
5997 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5998 {
5999 elf_i386_nacl_plt0_entry, /* plt0_entry */
6000 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6001 2, /* plt0_got1_offset */
6002 8, /* plt0_got2_offset */
6003 elf_i386_nacl_plt_entry, /* plt_entry */
6004 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6005 2, /* plt_got_offset */
6006 33, /* plt_reloc_offset */
6007 38, /* plt_plt_offset */
6008 32, /* plt_lazy_offset */
6009 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6010 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6011 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6012 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6013 };
6014
6015 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6016 {
6017 &elf_i386_nacl_plt, /* plt */
6018 0x90, /* plt0_pad_byte: nop insn */
6019 0, /* is_vxworks */
6020 };
6021
6022 static bfd_boolean
6023 elf32_i386_nacl_elf_object_p (bfd *abfd)
6024 {
6025 /* Set the right machine number for a NaCl i386 ELF32 file. */
6026 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6027 return TRUE;
6028 }
6029
6030 #undef elf_backend_arch_data
6031 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6032
6033 #undef elf_backend_object_p
6034 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6035 #undef elf_backend_modify_segment_map
6036 #define elf_backend_modify_segment_map nacl_modify_segment_map
6037 #undef elf_backend_modify_program_headers
6038 #define elf_backend_modify_program_headers nacl_modify_program_headers
6039 #undef elf_backend_final_write_processing
6040 #define elf_backend_final_write_processing nacl_final_write_processing
6041
6042 #include "elf32-target.h"
6043
6044 /* Restore defaults. */
6045 #undef elf_backend_object_p
6046 #undef elf_backend_modify_segment_map
6047 #undef elf_backend_modify_program_headers
6048 #undef elf_backend_final_write_processing
6049
6050 /* VxWorks support. */
6051
6052 #undef TARGET_LITTLE_SYM
6053 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6054 #undef TARGET_LITTLE_NAME
6055 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6056 #undef ELF_OSABI
6057 #undef elf_backend_plt_alignment
6058 #define elf_backend_plt_alignment 4
6059
6060 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6061 {
6062 &elf_i386_plt, /* plt */
6063 0x90, /* plt0_pad_byte */
6064 1, /* is_vxworks */
6065 };
6066
6067 #undef elf_backend_arch_data
6068 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6069
6070 #undef elf_backend_relocs_compatible
6071 #undef elf_backend_add_symbol_hook
6072 #define elf_backend_add_symbol_hook \
6073 elf_vxworks_add_symbol_hook
6074 #undef elf_backend_link_output_symbol_hook
6075 #define elf_backend_link_output_symbol_hook \
6076 elf_vxworks_link_output_symbol_hook
6077 #undef elf_backend_emit_relocs
6078 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6079 #undef elf_backend_final_write_processing
6080 #define elf_backend_final_write_processing \
6081 elf_vxworks_final_write_processing
6082 #undef elf_backend_static_tls_alignment
6083
6084 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6085 define it. */
6086 #undef elf_backend_want_plt_sym
6087 #define elf_backend_want_plt_sym 1
6088
6089 #undef elf32_bed
6090 #define elf32_bed elf32_i386_vxworks_bed
6091
6092 #include "elf32-target.h"
GDB Binutils - Deliverables
This page took 0.193458 seconds and 5 git commands to generate.