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Count size relocation as PC-relative relocation
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
4 Free Software Foundation, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf-nacl.h"
29 #include "elf-vxworks.h"
30 #include "bfd_stdint.h"
31 #include "objalloc.h"
32 #include "hashtab.h"
33 #include "dwarf2.h"
34
35 /* 386 uses REL relocations instead of RELA. */
36 #define USE_REL 1
37
38 #include "elf/i386.h"
39
40 static reloc_howto_type elf_howto_table[]=
41 {
42 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_NONE",
44 TRUE, 0x00000000, 0x00000000, FALSE),
45 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_32",
47 TRUE, 0xffffffff, 0xffffffff, FALSE),
48 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_PC32",
50 TRUE, 0xffffffff, 0xffffffff, TRUE),
51 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_GOT32",
53 TRUE, 0xffffffff, 0xffffffff, FALSE),
54 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_PLT32",
56 TRUE, 0xffffffff, 0xffffffff, TRUE),
57 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_COPY",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_RELATIVE",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTOFF",
71 TRUE, 0xffffffff, 0xffffffff, FALSE),
72 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
73 bfd_elf_generic_reloc, "R_386_GOTPC",
74 TRUE, 0xffffffff, 0xffffffff, TRUE),
75
76 /* We have a gap in the reloc numbers here.
77 R_386_standard counts the number up to this point, and
78 R_386_ext_offset is the value to subtract from a reloc type of
79 R_386_16 thru R_386_PC8 to form an index into this table. */
80 #define R_386_standard (R_386_GOTPC + 1)
81 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
82
83 /* These relocs are a GNU extension. */
84 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_IE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_LE",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_GD",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_TLS_LDM",
101 TRUE, 0xffffffff, 0xffffffff, FALSE),
102 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_16",
104 TRUE, 0xffff, 0xffff, FALSE),
105 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_PC16",
107 TRUE, 0xffff, 0xffff, TRUE),
108 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
109 bfd_elf_generic_reloc, "R_386_8",
110 TRUE, 0xff, 0xff, FALSE),
111 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
112 bfd_elf_generic_reloc, "R_386_PC8",
113 TRUE, 0xff, 0xff, TRUE),
114
115 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
116 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
117 /* These are common with Solaris TLS implementation. */
118 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
134 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
135 TRUE, 0xffffffff, 0xffffffff, FALSE),
136 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
137 bfd_elf_generic_reloc, "R_386_SIZE32",
138 TRUE, 0xffffffff, 0xffffffff, FALSE),
139 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
140 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
141 TRUE, 0xffffffff, 0xffffffff, FALSE),
142 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
143 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
144 FALSE, 0, 0, FALSE),
145 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
146 bfd_elf_generic_reloc, "R_386_TLS_DESC",
147 TRUE, 0xffffffff, 0xffffffff, FALSE),
148 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
149 bfd_elf_generic_reloc, "R_386_IRELATIVE",
150 TRUE, 0xffffffff, 0xffffffff, FALSE),
151
152 /* Another gap. */
153 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
154 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
155
156 /* GNU extension to record C++ vtable hierarchy. */
157 HOWTO (R_386_GNU_VTINHERIT, /* type */
158 0, /* rightshift */
159 2, /* size (0 = byte, 1 = short, 2 = long) */
160 0, /* bitsize */
161 FALSE, /* pc_relative */
162 0, /* bitpos */
163 complain_overflow_dont, /* complain_on_overflow */
164 NULL, /* special_function */
165 "R_386_GNU_VTINHERIT", /* name */
166 FALSE, /* partial_inplace */
167 0, /* src_mask */
168 0, /* dst_mask */
169 FALSE), /* pcrel_offset */
170
171 /* GNU extension to record C++ vtable member usage. */
172 HOWTO (R_386_GNU_VTENTRY, /* type */
173 0, /* rightshift */
174 2, /* size (0 = byte, 1 = short, 2 = long) */
175 0, /* bitsize */
176 FALSE, /* pc_relative */
177 0, /* bitpos */
178 complain_overflow_dont, /* complain_on_overflow */
179 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
180 "R_386_GNU_VTENTRY", /* name */
181 FALSE, /* partial_inplace */
182 0, /* src_mask */
183 0, /* dst_mask */
184 FALSE) /* pcrel_offset */
185
186 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
187
188 };
189
190 #ifdef DEBUG_GEN_RELOC
191 #define TRACE(str) \
192 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
193 #else
194 #define TRACE(str)
195 #endif
196
197 static reloc_howto_type *
198 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
199 bfd_reloc_code_real_type code)
200 {
201 switch (code)
202 {
203 case BFD_RELOC_NONE:
204 TRACE ("BFD_RELOC_NONE");
205 return &elf_howto_table[R_386_NONE];
206
207 case BFD_RELOC_32:
208 TRACE ("BFD_RELOC_32");
209 return &elf_howto_table[R_386_32];
210
211 case BFD_RELOC_CTOR:
212 TRACE ("BFD_RELOC_CTOR");
213 return &elf_howto_table[R_386_32];
214
215 case BFD_RELOC_32_PCREL:
216 TRACE ("BFD_RELOC_PC32");
217 return &elf_howto_table[R_386_PC32];
218
219 case BFD_RELOC_386_GOT32:
220 TRACE ("BFD_RELOC_386_GOT32");
221 return &elf_howto_table[R_386_GOT32];
222
223 case BFD_RELOC_386_PLT32:
224 TRACE ("BFD_RELOC_386_PLT32");
225 return &elf_howto_table[R_386_PLT32];
226
227 case BFD_RELOC_386_COPY:
228 TRACE ("BFD_RELOC_386_COPY");
229 return &elf_howto_table[R_386_COPY];
230
231 case BFD_RELOC_386_GLOB_DAT:
232 TRACE ("BFD_RELOC_386_GLOB_DAT");
233 return &elf_howto_table[R_386_GLOB_DAT];
234
235 case BFD_RELOC_386_JUMP_SLOT:
236 TRACE ("BFD_RELOC_386_JUMP_SLOT");
237 return &elf_howto_table[R_386_JUMP_SLOT];
238
239 case BFD_RELOC_386_RELATIVE:
240 TRACE ("BFD_RELOC_386_RELATIVE");
241 return &elf_howto_table[R_386_RELATIVE];
242
243 case BFD_RELOC_386_GOTOFF:
244 TRACE ("BFD_RELOC_386_GOTOFF");
245 return &elf_howto_table[R_386_GOTOFF];
246
247 case BFD_RELOC_386_GOTPC:
248 TRACE ("BFD_RELOC_386_GOTPC");
249 return &elf_howto_table[R_386_GOTPC];
250
251 /* These relocs are a GNU extension. */
252 case BFD_RELOC_386_TLS_TPOFF:
253 TRACE ("BFD_RELOC_386_TLS_TPOFF");
254 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_IE:
257 TRACE ("BFD_RELOC_386_TLS_IE");
258 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_GOTIE:
261 TRACE ("BFD_RELOC_386_TLS_GOTIE");
262 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_LE:
265 TRACE ("BFD_RELOC_386_TLS_LE");
266 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
267
268 case BFD_RELOC_386_TLS_GD:
269 TRACE ("BFD_RELOC_386_TLS_GD");
270 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
271
272 case BFD_RELOC_386_TLS_LDM:
273 TRACE ("BFD_RELOC_386_TLS_LDM");
274 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
275
276 case BFD_RELOC_16:
277 TRACE ("BFD_RELOC_16");
278 return &elf_howto_table[R_386_16 - R_386_ext_offset];
279
280 case BFD_RELOC_16_PCREL:
281 TRACE ("BFD_RELOC_16_PCREL");
282 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
283
284 case BFD_RELOC_8:
285 TRACE ("BFD_RELOC_8");
286 return &elf_howto_table[R_386_8 - R_386_ext_offset];
287
288 case BFD_RELOC_8_PCREL:
289 TRACE ("BFD_RELOC_8_PCREL");
290 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
291
292 /* Common with Sun TLS implementation. */
293 case BFD_RELOC_386_TLS_LDO_32:
294 TRACE ("BFD_RELOC_386_TLS_LDO_32");
295 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_IE_32:
298 TRACE ("BFD_RELOC_386_TLS_IE_32");
299 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_LE_32:
302 TRACE ("BFD_RELOC_386_TLS_LE_32");
303 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_DTPMOD32:
306 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
307 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
308
309 case BFD_RELOC_386_TLS_DTPOFF32:
310 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
311 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_TPOFF32:
314 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
315 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
316
317 case BFD_RELOC_SIZE32:
318 TRACE ("BFD_RELOC_SIZE32");
319 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_GOTDESC:
322 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
323 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_TLS_DESC_CALL:
326 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
327 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
328
329 case BFD_RELOC_386_TLS_DESC:
330 TRACE ("BFD_RELOC_386_TLS_DESC");
331 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
332
333 case BFD_RELOC_386_IRELATIVE:
334 TRACE ("BFD_RELOC_386_IRELATIVE");
335 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
336
337 case BFD_RELOC_VTABLE_INHERIT:
338 TRACE ("BFD_RELOC_VTABLE_INHERIT");
339 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
340
341 case BFD_RELOC_VTABLE_ENTRY:
342 TRACE ("BFD_RELOC_VTABLE_ENTRY");
343 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
344
345 default:
346 break;
347 }
348
349 TRACE ("Unknown");
350 return 0;
351 }
352
353 static reloc_howto_type *
354 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
355 const char *r_name)
356 {
357 unsigned int i;
358
359 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
360 if (elf_howto_table[i].name != NULL
361 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
362 return &elf_howto_table[i];
363
364 return NULL;
365 }
366
367 static reloc_howto_type *
368 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
369 {
370 unsigned int indx;
371
372 if ((indx = r_type) >= R_386_standard
373 && ((indx = r_type - R_386_ext_offset) - R_386_standard
374 >= R_386_ext - R_386_standard)
375 && ((indx = r_type - R_386_tls_offset) - R_386_ext
376 >= R_386_irelative - R_386_ext)
377 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
378 >= R_386_vt - R_386_irelative))
379 {
380 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
381 abfd, (int) r_type);
382 indx = R_386_NONE;
383 }
384 BFD_ASSERT (elf_howto_table [indx].type == r_type);
385 return &elf_howto_table[indx];
386 }
387
388 static void
389 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
390 arelent *cache_ptr,
391 Elf_Internal_Rela *dst)
392 {
393 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
394 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
395 }
396
397 /* Return whether a symbol name implies a local label. The UnixWare
398 2.1 cc generates temporary symbols that start with .X, so we
399 recognize them here. FIXME: do other SVR4 compilers also use .X?.
400 If so, we should move the .X recognition into
401 _bfd_elf_is_local_label_name. */
402
403 static bfd_boolean
404 elf_i386_is_local_label_name (bfd *abfd, const char *name)
405 {
406 if (name[0] == '.' && name[1] == 'X')
407 return TRUE;
408
409 return _bfd_elf_is_local_label_name (abfd, name);
410 }
411 \f
412 /* Support for core dump NOTE sections. */
413
414 static bfd_boolean
415 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
416 {
417 int offset;
418 size_t size;
419
420 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
421 {
422 int pr_version = bfd_get_32 (abfd, note->descdata);
423
424 if (pr_version != 1)
425 return FALSE;
426
427 /* pr_cursig */
428 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
429
430 /* pr_pid */
431 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
432
433 /* pr_reg */
434 offset = 28;
435 size = bfd_get_32 (abfd, note->descdata + 8);
436 }
437 else
438 {
439 switch (note->descsz)
440 {
441 default:
442 return FALSE;
443
444 case 144: /* Linux/i386 */
445 /* pr_cursig */
446 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
447
448 /* pr_pid */
449 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
450
451 /* pr_reg */
452 offset = 72;
453 size = 68;
454
455 break;
456 }
457 }
458
459 /* Make a ".reg/999" section. */
460 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
461 size, note->descpos + offset);
462 }
463
464 static bfd_boolean
465 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
466 {
467 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
468 {
469 int pr_version = bfd_get_32 (abfd, note->descdata);
470
471 if (pr_version != 1)
472 return FALSE;
473
474 elf_tdata (abfd)->core_program
475 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
476 elf_tdata (abfd)->core_command
477 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
478 }
479 else
480 {
481 switch (note->descsz)
482 {
483 default:
484 return FALSE;
485
486 case 124: /* Linux/i386 elf_prpsinfo. */
487 elf_tdata (abfd)->core_pid
488 = bfd_get_32 (abfd, note->descdata + 12);
489 elf_tdata (abfd)->core_program
490 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
491 elf_tdata (abfd)->core_command
492 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
493 }
494 }
495
496 /* Note that for some reason, a spurious space is tacked
497 onto the end of the args in some (at least one anyway)
498 implementations, so strip it off if it exists. */
499 {
500 char *command = elf_tdata (abfd)->core_command;
501 int n = strlen (command);
502
503 if (0 < n && command[n - 1] == ' ')
504 command[n - 1] = '\0';
505 }
506
507 return TRUE;
508 }
509 \f
510 /* Functions for the i386 ELF linker.
511
512 In order to gain some understanding of code in this file without
513 knowing all the intricate details of the linker, note the
514 following:
515
516 Functions named elf_i386_* are called by external routines, other
517 functions are only called locally. elf_i386_* functions appear
518 in this file more or less in the order in which they are called
519 from external routines. eg. elf_i386_check_relocs is called
520 early in the link process, elf_i386_finish_dynamic_sections is
521 one of the last functions. */
522
523
524 /* The name of the dynamic interpreter. This is put in the .interp
525 section. */
526
527 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
528
529 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
530 copying dynamic variables from a shared lib into an app's dynbss
531 section, and instead use a dynamic relocation to point into the
532 shared lib. */
533 #define ELIMINATE_COPY_RELOCS 1
534
535 /* The size in bytes of an entry in the procedure linkage table. */
536
537 #define PLT_ENTRY_SIZE 16
538
539 /* The first entry in an absolute procedure linkage table looks like
540 this. See the SVR4 ABI i386 supplement to see how this works.
541 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
542
543 static const bfd_byte elf_i386_plt0_entry[12] =
544 {
545 0xff, 0x35, /* pushl contents of address */
546 0, 0, 0, 0, /* replaced with address of .got + 4. */
547 0xff, 0x25, /* jmp indirect */
548 0, 0, 0, 0 /* replaced with address of .got + 8. */
549 };
550
551 /* Subsequent entries in an absolute procedure linkage table look like
552 this. */
553
554 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
555 {
556 0xff, 0x25, /* jmp indirect */
557 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
558 0x68, /* pushl immediate */
559 0, 0, 0, 0, /* replaced with offset into relocation table. */
560 0xe9, /* jmp relative */
561 0, 0, 0, 0 /* replaced with offset to start of .plt. */
562 };
563
564 /* The first entry in a PIC procedure linkage table look like this.
565 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC procedure linkage table look like this. */
574
575 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
576 {
577 0xff, 0xa3, /* jmp *offset(%ebx) */
578 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
579 0x68, /* pushl immediate */
580 0, 0, 0, 0, /* replaced with offset into relocation table. */
581 0xe9, /* jmp relative */
582 0, 0, 0, 0 /* replaced with offset to start of .plt. */
583 };
584
585 /* .eh_frame covering the .plt section. */
586
587 static const bfd_byte elf_i386_eh_frame_plt[] =
588 {
589 #define PLT_CIE_LENGTH 20
590 #define PLT_FDE_LENGTH 36
591 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
592 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
593 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
594 0, 0, 0, 0, /* CIE ID */
595 1, /* CIE version */
596 'z', 'R', 0, /* Augmentation string */
597 1, /* Code alignment factor */
598 0x7c, /* Data alignment factor */
599 8, /* Return address column */
600 1, /* Augmentation size */
601 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
602 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
603 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
604 DW_CFA_nop, DW_CFA_nop,
605
606 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
607 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
608 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
609 0, 0, 0, 0, /* .plt size goes here */
610 0, /* Augmentation size */
611 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
612 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
613 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
614 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
615 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
616 11, /* Block length */
617 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
618 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
619 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
620 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
621 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
622 };
623
624 struct elf_i386_plt_layout
625 {
626 /* The first entry in an absolute procedure linkage table looks like this. */
627 const bfd_byte *plt0_entry;
628 unsigned int plt0_entry_size;
629
630 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
631 unsigned int plt0_got1_offset;
632 unsigned int plt0_got2_offset;
633
634 /* Later entries in an absolute procedure linkage table look like this. */
635 const bfd_byte *plt_entry;
636 unsigned int plt_entry_size;
637
638 /* Offsets into plt_entry that are to be replaced with... */
639 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
640 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
641 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
642
643 /* Offset into plt_entry where the initial value of the GOT entry points. */
644 unsigned int plt_lazy_offset;
645
646 /* The first entry in a PIC procedure linkage table looks like this. */
647 const bfd_byte *pic_plt0_entry;
648
649 /* Subsequent entries in a PIC procedure linkage table look like this. */
650 const bfd_byte *pic_plt_entry;
651
652 /* .eh_frame covering the .plt section. */
653 const bfd_byte *eh_frame_plt;
654 unsigned int eh_frame_plt_size;
655 };
656
657 #define GET_PLT_ENTRY_SIZE(abfd) \
658 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
659
660 /* These are the standard parameters. */
661 static const struct elf_i386_plt_layout elf_i386_plt =
662 {
663 elf_i386_plt0_entry, /* plt0_entry */
664 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
665 2, /* plt0_got1_offset */
666 8, /* plt0_got2_offset */
667 elf_i386_plt_entry, /* plt_entry */
668 PLT_ENTRY_SIZE, /* plt_entry_size */
669 2, /* plt_got_offset */
670 7, /* plt_reloc_offset */
671 12, /* plt_plt_offset */
672 6, /* plt_lazy_offset */
673 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
674 elf_i386_pic_plt_entry, /* pic_plt_entry */
675 elf_i386_eh_frame_plt, /* eh_frame_plt */
676 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
677 };
678 \f
679
680 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
681 for the PLTResolve stub and then for each PLT entry. */
682 #define PLTRESOLVE_RELOCS_SHLIB 0
683 #define PLTRESOLVE_RELOCS 2
684 #define PLT_NON_JUMP_SLOT_RELOCS 2
685
686 /* Architecture-specific backend data for i386. */
687
688 struct elf_i386_backend_data
689 {
690 /* Parameters describing PLT generation. */
691 const struct elf_i386_plt_layout *plt;
692
693 /* Value used to fill the unused bytes of the first PLT entry. */
694 bfd_byte plt0_pad_byte;
695
696 /* True if the target system is VxWorks. */
697 int is_vxworks;
698 };
699
700 #define get_elf_i386_backend_data(abfd) \
701 ((const struct elf_i386_backend_data *) \
702 get_elf_backend_data (abfd)->arch_data)
703
704 /* These are the standard parameters. */
705 static const struct elf_i386_backend_data elf_i386_arch_bed =
706 {
707 &elf_i386_plt, /* plt */
708 0, /* plt0_pad_byte */
709 0, /* is_vxworks */
710 };
711
712 #define elf_backend_arch_data &elf_i386_arch_bed
713
714 /* i386 ELF linker hash entry. */
715
716 struct elf_i386_link_hash_entry
717 {
718 struct elf_link_hash_entry elf;
719
720 /* Track dynamic relocs copied for this symbol. */
721 struct elf_dyn_relocs *dyn_relocs;
722
723 #define GOT_UNKNOWN 0
724 #define GOT_NORMAL 1
725 #define GOT_TLS_GD 2
726 #define GOT_TLS_IE 4
727 #define GOT_TLS_IE_POS 5
728 #define GOT_TLS_IE_NEG 6
729 #define GOT_TLS_IE_BOTH 7
730 #define GOT_TLS_GDESC 8
731 #define GOT_TLS_GD_BOTH_P(type) \
732 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
733 #define GOT_TLS_GD_P(type) \
734 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
735 #define GOT_TLS_GDESC_P(type) \
736 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
737 #define GOT_TLS_GD_ANY_P(type) \
738 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
739 unsigned char tls_type;
740
741 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
742 starting at the end of the jump table. */
743 bfd_vma tlsdesc_got;
744 };
745
746 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
747
748 struct elf_i386_obj_tdata
749 {
750 struct elf_obj_tdata root;
751
752 /* tls_type for each local got entry. */
753 char *local_got_tls_type;
754
755 /* GOTPLT entries for TLS descriptors. */
756 bfd_vma *local_tlsdesc_gotent;
757 };
758
759 #define elf_i386_tdata(abfd) \
760 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
761
762 #define elf_i386_local_got_tls_type(abfd) \
763 (elf_i386_tdata (abfd)->local_got_tls_type)
764
765 #define elf_i386_local_tlsdesc_gotent(abfd) \
766 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
767
768 #define is_i386_elf(bfd) \
769 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
770 && elf_tdata (bfd) != NULL \
771 && elf_object_id (bfd) == I386_ELF_DATA)
772
773 static bfd_boolean
774 elf_i386_mkobject (bfd *abfd)
775 {
776 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
777 I386_ELF_DATA);
778 }
779
780 /* i386 ELF linker hash table. */
781
782 struct elf_i386_link_hash_table
783 {
784 struct elf_link_hash_table elf;
785
786 /* Short-cuts to get to dynamic linker sections. */
787 asection *sdynbss;
788 asection *srelbss;
789 asection *plt_eh_frame;
790
791 union
792 {
793 bfd_signed_vma refcount;
794 bfd_vma offset;
795 } tls_ldm_got;
796
797 /* The amount of space used by the reserved portion of the sgotplt
798 section, plus whatever space is used by the jump slots. */
799 bfd_vma sgotplt_jump_table_size;
800
801 /* Small local sym cache. */
802 struct sym_cache sym_cache;
803
804 /* _TLS_MODULE_BASE_ symbol. */
805 struct bfd_link_hash_entry *tls_module_base;
806
807 /* Used by local STT_GNU_IFUNC symbols. */
808 htab_t loc_hash_table;
809 void * loc_hash_memory;
810
811 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
812 asection *srelplt2;
813
814 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
815 bfd_vma next_tls_desc_index;
816
817 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
818 bfd_vma next_jump_slot_index;
819
820 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
821 bfd_vma next_irelative_index;
822 };
823
824 /* Get the i386 ELF linker hash table from a link_info structure. */
825
826 #define elf_i386_hash_table(p) \
827 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
828 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
829
830 #define elf_i386_compute_jump_table_size(htab) \
831 ((htab)->next_tls_desc_index * 4)
832
833 /* Create an entry in an i386 ELF linker hash table. */
834
835 static struct bfd_hash_entry *
836 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
837 struct bfd_hash_table *table,
838 const char *string)
839 {
840 /* Allocate the structure if it has not already been allocated by a
841 subclass. */
842 if (entry == NULL)
843 {
844 entry = (struct bfd_hash_entry *)
845 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
846 if (entry == NULL)
847 return entry;
848 }
849
850 /* Call the allocation method of the superclass. */
851 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
852 if (entry != NULL)
853 {
854 struct elf_i386_link_hash_entry *eh;
855
856 eh = (struct elf_i386_link_hash_entry *) entry;
857 eh->dyn_relocs = NULL;
858 eh->tls_type = GOT_UNKNOWN;
859 eh->tlsdesc_got = (bfd_vma) -1;
860 }
861
862 return entry;
863 }
864
865 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
866 for local symbol so that we can handle local STT_GNU_IFUNC symbols
867 as global symbol. We reuse indx and dynstr_index for local symbol
868 hash since they aren't used by global symbols in this backend. */
869
870 static hashval_t
871 elf_i386_local_htab_hash (const void *ptr)
872 {
873 struct elf_link_hash_entry *h
874 = (struct elf_link_hash_entry *) ptr;
875 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
876 }
877
878 /* Compare local hash entries. */
879
880 static int
881 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
882 {
883 struct elf_link_hash_entry *h1
884 = (struct elf_link_hash_entry *) ptr1;
885 struct elf_link_hash_entry *h2
886 = (struct elf_link_hash_entry *) ptr2;
887
888 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
889 }
890
891 /* Find and/or create a hash entry for local symbol. */
892
893 static struct elf_link_hash_entry *
894 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
895 bfd *abfd, const Elf_Internal_Rela *rel,
896 bfd_boolean create)
897 {
898 struct elf_i386_link_hash_entry e, *ret;
899 asection *sec = abfd->sections;
900 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
901 ELF32_R_SYM (rel->r_info));
902 void **slot;
903
904 e.elf.indx = sec->id;
905 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
906 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
907 create ? INSERT : NO_INSERT);
908
909 if (!slot)
910 return NULL;
911
912 if (*slot)
913 {
914 ret = (struct elf_i386_link_hash_entry *) *slot;
915 return &ret->elf;
916 }
917
918 ret = (struct elf_i386_link_hash_entry *)
919 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
920 sizeof (struct elf_i386_link_hash_entry));
921 if (ret)
922 {
923 memset (ret, 0, sizeof (*ret));
924 ret->elf.indx = sec->id;
925 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
926 ret->elf.dynindx = -1;
927 *slot = ret;
928 }
929 return &ret->elf;
930 }
931
932 /* Create an i386 ELF linker hash table. */
933
934 static struct bfd_link_hash_table *
935 elf_i386_link_hash_table_create (bfd *abfd)
936 {
937 struct elf_i386_link_hash_table *ret;
938 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
939
940 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
941 if (ret == NULL)
942 return NULL;
943
944 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
945 elf_i386_link_hash_newfunc,
946 sizeof (struct elf_i386_link_hash_entry),
947 I386_ELF_DATA))
948 {
949 free (ret);
950 return NULL;
951 }
952
953 ret->sdynbss = NULL;
954 ret->srelbss = NULL;
955 ret->plt_eh_frame = NULL;
956 ret->tls_ldm_got.refcount = 0;
957 ret->next_tls_desc_index = 0;
958 ret->sgotplt_jump_table_size = 0;
959 ret->sym_cache.abfd = NULL;
960 ret->srelplt2 = NULL;
961 ret->tls_module_base = NULL;
962 ret->next_jump_slot_index = 0;
963 ret->next_irelative_index = 0;
964
965 ret->loc_hash_table = htab_try_create (1024,
966 elf_i386_local_htab_hash,
967 elf_i386_local_htab_eq,
968 NULL);
969 ret->loc_hash_memory = objalloc_create ();
970 if (!ret->loc_hash_table || !ret->loc_hash_memory)
971 {
972 free (ret);
973 return NULL;
974 }
975
976 return &ret->elf.root;
977 }
978
979 /* Destroy an i386 ELF linker hash table. */
980
981 static void
982 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
983 {
984 struct elf_i386_link_hash_table *htab
985 = (struct elf_i386_link_hash_table *) hash;
986
987 if (htab->loc_hash_table)
988 htab_delete (htab->loc_hash_table);
989 if (htab->loc_hash_memory)
990 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
991 _bfd_generic_link_hash_table_free (hash);
992 }
993
994 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
995 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
996 hash table. */
997
998 static bfd_boolean
999 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1000 {
1001 struct elf_i386_link_hash_table *htab;
1002
1003 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1004 return FALSE;
1005
1006 htab = elf_i386_hash_table (info);
1007 if (htab == NULL)
1008 return FALSE;
1009
1010 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1011 if (!info->shared)
1012 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1013
1014 if (!htab->sdynbss
1015 || (!info->shared && !htab->srelbss))
1016 abort ();
1017
1018 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1019 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1020 &htab->srelplt2))
1021 return FALSE;
1022
1023 if (!info->no_ld_generated_unwind_info
1024 && htab->plt_eh_frame == NULL
1025 && htab->elf.splt != NULL)
1026 {
1027 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1028 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1029 | SEC_LINKER_CREATED);
1030 htab->plt_eh_frame
1031 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1032 if (htab->plt_eh_frame == NULL
1033 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1034 return FALSE;
1035 }
1036
1037 return TRUE;
1038 }
1039
1040 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1041
1042 static void
1043 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1044 struct elf_link_hash_entry *dir,
1045 struct elf_link_hash_entry *ind)
1046 {
1047 struct elf_i386_link_hash_entry *edir, *eind;
1048
1049 edir = (struct elf_i386_link_hash_entry *) dir;
1050 eind = (struct elf_i386_link_hash_entry *) ind;
1051
1052 if (eind->dyn_relocs != NULL)
1053 {
1054 if (edir->dyn_relocs != NULL)
1055 {
1056 struct elf_dyn_relocs **pp;
1057 struct elf_dyn_relocs *p;
1058
1059 /* Add reloc counts against the indirect sym to the direct sym
1060 list. Merge any entries against the same section. */
1061 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1062 {
1063 struct elf_dyn_relocs *q;
1064
1065 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1066 if (q->sec == p->sec)
1067 {
1068 q->pc_count += p->pc_count;
1069 q->count += p->count;
1070 *pp = p->next;
1071 break;
1072 }
1073 if (q == NULL)
1074 pp = &p->next;
1075 }
1076 *pp = edir->dyn_relocs;
1077 }
1078
1079 edir->dyn_relocs = eind->dyn_relocs;
1080 eind->dyn_relocs = NULL;
1081 }
1082
1083 if (ind->root.type == bfd_link_hash_indirect
1084 && dir->got.refcount <= 0)
1085 {
1086 edir->tls_type = eind->tls_type;
1087 eind->tls_type = GOT_UNKNOWN;
1088 }
1089
1090 if (ELIMINATE_COPY_RELOCS
1091 && ind->root.type != bfd_link_hash_indirect
1092 && dir->dynamic_adjusted)
1093 {
1094 /* If called to transfer flags for a weakdef during processing
1095 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1096 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1097 dir->ref_dynamic |= ind->ref_dynamic;
1098 dir->ref_regular |= ind->ref_regular;
1099 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1100 dir->needs_plt |= ind->needs_plt;
1101 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1102 }
1103 else
1104 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1105 }
1106
1107 /* Return TRUE if the TLS access code sequence support transition
1108 from R_TYPE. */
1109
1110 static bfd_boolean
1111 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1112 bfd_byte *contents,
1113 Elf_Internal_Shdr *symtab_hdr,
1114 struct elf_link_hash_entry **sym_hashes,
1115 unsigned int r_type,
1116 const Elf_Internal_Rela *rel,
1117 const Elf_Internal_Rela *relend)
1118 {
1119 unsigned int val, type;
1120 unsigned long r_symndx;
1121 struct elf_link_hash_entry *h;
1122 bfd_vma offset;
1123
1124 /* Get the section contents. */
1125 if (contents == NULL)
1126 {
1127 if (elf_section_data (sec)->this_hdr.contents != NULL)
1128 contents = elf_section_data (sec)->this_hdr.contents;
1129 else
1130 {
1131 /* FIXME: How to better handle error condition? */
1132 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1133 return FALSE;
1134
1135 /* Cache the section contents for elf_link_input_bfd. */
1136 elf_section_data (sec)->this_hdr.contents = contents;
1137 }
1138 }
1139
1140 offset = rel->r_offset;
1141 switch (r_type)
1142 {
1143 case R_386_TLS_GD:
1144 case R_386_TLS_LDM:
1145 if (offset < 2 || (rel + 1) >= relend)
1146 return FALSE;
1147
1148 type = bfd_get_8 (abfd, contents + offset - 2);
1149 if (r_type == R_386_TLS_GD)
1150 {
1151 /* Check transition from GD access model. Only
1152 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1153 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1154 can transit to different access model. */
1155 if ((offset + 10) > sec->size ||
1156 (type != 0x8d && type != 0x04))
1157 return FALSE;
1158
1159 val = bfd_get_8 (abfd, contents + offset - 1);
1160 if (type == 0x04)
1161 {
1162 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1163 if (offset < 3)
1164 return FALSE;
1165
1166 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1167 return FALSE;
1168
1169 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1170 return FALSE;
1171 }
1172 else
1173 {
1174 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1175 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1176 return FALSE;
1177
1178 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1179 return FALSE;
1180 }
1181 }
1182 else
1183 {
1184 /* Check transition from LD access model. Only
1185 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1186 can transit to different access model. */
1187 if (type != 0x8d || (offset + 9) > sec->size)
1188 return FALSE;
1189
1190 val = bfd_get_8 (abfd, contents + offset - 1);
1191 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1192 return FALSE;
1193 }
1194
1195 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1196 return FALSE;
1197
1198 r_symndx = ELF32_R_SYM (rel[1].r_info);
1199 if (r_symndx < symtab_hdr->sh_info)
1200 return FALSE;
1201
1202 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1203 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1204 may be versioned. */
1205 return (h != NULL
1206 && h->root.root.string != NULL
1207 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1208 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1209 && (strncmp (h->root.root.string, "___tls_get_addr",
1210 15) == 0));
1211
1212 case R_386_TLS_IE:
1213 /* Check transition from IE access model:
1214 movl foo@indntpoff(%rip), %eax
1215 movl foo@indntpoff(%rip), %reg
1216 addl foo@indntpoff(%rip), %reg
1217 */
1218
1219 if (offset < 1 || (offset + 4) > sec->size)
1220 return FALSE;
1221
1222 /* Check "movl foo@tpoff(%rip), %eax" first. */
1223 val = bfd_get_8 (abfd, contents + offset - 1);
1224 if (val == 0xa1)
1225 return TRUE;
1226
1227 if (offset < 2)
1228 return FALSE;
1229
1230 /* Check movl|addl foo@tpoff(%rip), %reg. */
1231 type = bfd_get_8 (abfd, contents + offset - 2);
1232 return ((type == 0x8b || type == 0x03)
1233 && (val & 0xc7) == 0x05);
1234
1235 case R_386_TLS_GOTIE:
1236 case R_386_TLS_IE_32:
1237 /* Check transition from {IE_32,GOTIE} access model:
1238 subl foo@{tpoff,gontoff}(%reg1), %reg2
1239 movl foo@{tpoff,gontoff}(%reg1), %reg2
1240 addl foo@{tpoff,gontoff}(%reg1), %reg2
1241 */
1242
1243 if (offset < 2 || (offset + 4) > sec->size)
1244 return FALSE;
1245
1246 val = bfd_get_8 (abfd, contents + offset - 1);
1247 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1248 return FALSE;
1249
1250 type = bfd_get_8 (abfd, contents + offset - 2);
1251 return type == 0x8b || type == 0x2b || type == 0x03;
1252
1253 case R_386_TLS_GOTDESC:
1254 /* Check transition from GDesc access model:
1255 leal x@tlsdesc(%ebx), %eax
1256
1257 Make sure it's a leal adding ebx to a 32-bit offset
1258 into any register, although it's probably almost always
1259 going to be eax. */
1260
1261 if (offset < 2 || (offset + 4) > sec->size)
1262 return FALSE;
1263
1264 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1265 return FALSE;
1266
1267 val = bfd_get_8 (abfd, contents + offset - 1);
1268 return (val & 0xc7) == 0x83;
1269
1270 case R_386_TLS_DESC_CALL:
1271 /* Check transition from GDesc access model:
1272 call *x@tlsdesc(%rax)
1273 */
1274 if (offset + 2 <= sec->size)
1275 {
1276 /* Make sure that it's a call *x@tlsdesc(%rax). */
1277 static const unsigned char call[] = { 0xff, 0x10 };
1278 return memcmp (contents + offset, call, 2) == 0;
1279 }
1280
1281 return FALSE;
1282
1283 default:
1284 abort ();
1285 }
1286 }
1287
1288 /* Return TRUE if the TLS access transition is OK or no transition
1289 will be performed. Update R_TYPE if there is a transition. */
1290
1291 static bfd_boolean
1292 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1293 asection *sec, bfd_byte *contents,
1294 Elf_Internal_Shdr *symtab_hdr,
1295 struct elf_link_hash_entry **sym_hashes,
1296 unsigned int *r_type, int tls_type,
1297 const Elf_Internal_Rela *rel,
1298 const Elf_Internal_Rela *relend,
1299 struct elf_link_hash_entry *h,
1300 unsigned long r_symndx)
1301 {
1302 unsigned int from_type = *r_type;
1303 unsigned int to_type = from_type;
1304 bfd_boolean check = TRUE;
1305
1306 /* Skip TLS transition for functions. */
1307 if (h != NULL
1308 && (h->type == STT_FUNC
1309 || h->type == STT_GNU_IFUNC))
1310 return TRUE;
1311
1312 switch (from_type)
1313 {
1314 case R_386_TLS_GD:
1315 case R_386_TLS_GOTDESC:
1316 case R_386_TLS_DESC_CALL:
1317 case R_386_TLS_IE_32:
1318 case R_386_TLS_IE:
1319 case R_386_TLS_GOTIE:
1320 if (info->executable)
1321 {
1322 if (h == NULL)
1323 to_type = R_386_TLS_LE_32;
1324 else if (from_type != R_386_TLS_IE
1325 && from_type != R_386_TLS_GOTIE)
1326 to_type = R_386_TLS_IE_32;
1327 }
1328
1329 /* When we are called from elf_i386_relocate_section, CONTENTS
1330 isn't NULL and there may be additional transitions based on
1331 TLS_TYPE. */
1332 if (contents != NULL)
1333 {
1334 unsigned int new_to_type = to_type;
1335
1336 if (info->executable
1337 && h != NULL
1338 && h->dynindx == -1
1339 && (tls_type & GOT_TLS_IE))
1340 new_to_type = R_386_TLS_LE_32;
1341
1342 if (to_type == R_386_TLS_GD
1343 || to_type == R_386_TLS_GOTDESC
1344 || to_type == R_386_TLS_DESC_CALL)
1345 {
1346 if (tls_type == GOT_TLS_IE_POS)
1347 new_to_type = R_386_TLS_GOTIE;
1348 else if (tls_type & GOT_TLS_IE)
1349 new_to_type = R_386_TLS_IE_32;
1350 }
1351
1352 /* We checked the transition before when we were called from
1353 elf_i386_check_relocs. We only want to check the new
1354 transition which hasn't been checked before. */
1355 check = new_to_type != to_type && from_type == to_type;
1356 to_type = new_to_type;
1357 }
1358
1359 break;
1360
1361 case R_386_TLS_LDM:
1362 if (info->executable)
1363 to_type = R_386_TLS_LE_32;
1364 break;
1365
1366 default:
1367 return TRUE;
1368 }
1369
1370 /* Return TRUE if there is no transition. */
1371 if (from_type == to_type)
1372 return TRUE;
1373
1374 /* Check if the transition can be performed. */
1375 if (check
1376 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1377 symtab_hdr, sym_hashes,
1378 from_type, rel, relend))
1379 {
1380 reloc_howto_type *from, *to;
1381 const char *name;
1382
1383 from = elf_i386_rtype_to_howto (abfd, from_type);
1384 to = elf_i386_rtype_to_howto (abfd, to_type);
1385
1386 if (h)
1387 name = h->root.root.string;
1388 else
1389 {
1390 struct elf_i386_link_hash_table *htab;
1391
1392 htab = elf_i386_hash_table (info);
1393 if (htab == NULL)
1394 name = "*unknown*";
1395 else
1396 {
1397 Elf_Internal_Sym *isym;
1398
1399 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1400 abfd, r_symndx);
1401 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1402 }
1403 }
1404
1405 (*_bfd_error_handler)
1406 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1407 "in section `%A' failed"),
1408 abfd, sec, from->name, to->name, name,
1409 (unsigned long) rel->r_offset);
1410 bfd_set_error (bfd_error_bad_value);
1411 return FALSE;
1412 }
1413
1414 *r_type = to_type;
1415 return TRUE;
1416 }
1417
1418 /* Look through the relocs for a section during the first phase, and
1419 calculate needed space in the global offset table, procedure linkage
1420 table, and dynamic reloc sections. */
1421
1422 static bfd_boolean
1423 elf_i386_check_relocs (bfd *abfd,
1424 struct bfd_link_info *info,
1425 asection *sec,
1426 const Elf_Internal_Rela *relocs)
1427 {
1428 struct elf_i386_link_hash_table *htab;
1429 Elf_Internal_Shdr *symtab_hdr;
1430 struct elf_link_hash_entry **sym_hashes;
1431 const Elf_Internal_Rela *rel;
1432 const Elf_Internal_Rela *rel_end;
1433 asection *sreloc;
1434
1435 if (info->relocatable)
1436 return TRUE;
1437
1438 BFD_ASSERT (is_i386_elf (abfd));
1439
1440 htab = elf_i386_hash_table (info);
1441 if (htab == NULL)
1442 return FALSE;
1443
1444 symtab_hdr = &elf_symtab_hdr (abfd);
1445 sym_hashes = elf_sym_hashes (abfd);
1446
1447 sreloc = NULL;
1448
1449 rel_end = relocs + sec->reloc_count;
1450 for (rel = relocs; rel < rel_end; rel++)
1451 {
1452 unsigned int r_type;
1453 unsigned long r_symndx;
1454 struct elf_link_hash_entry *h;
1455 Elf_Internal_Sym *isym;
1456 const char *name;
1457 bfd_boolean size_reloc;
1458
1459 r_symndx = ELF32_R_SYM (rel->r_info);
1460 r_type = ELF32_R_TYPE (rel->r_info);
1461
1462 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1463 {
1464 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1465 abfd,
1466 r_symndx);
1467 return FALSE;
1468 }
1469
1470 if (r_symndx < symtab_hdr->sh_info)
1471 {
1472 /* A local symbol. */
1473 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1474 abfd, r_symndx);
1475 if (isym == NULL)
1476 return FALSE;
1477
1478 /* Check relocation against local STT_GNU_IFUNC symbol. */
1479 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1480 {
1481 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1482 if (h == NULL)
1483 return FALSE;
1484
1485 /* Fake a STT_GNU_IFUNC symbol. */
1486 h->type = STT_GNU_IFUNC;
1487 h->def_regular = 1;
1488 h->ref_regular = 1;
1489 h->forced_local = 1;
1490 h->root.type = bfd_link_hash_defined;
1491 }
1492 else
1493 h = NULL;
1494 }
1495 else
1496 {
1497 isym = NULL;
1498 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1499 while (h->root.type == bfd_link_hash_indirect
1500 || h->root.type == bfd_link_hash_warning)
1501 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1502 }
1503
1504 if (h != NULL)
1505 {
1506 /* Create the ifunc sections for static executables. If we
1507 never see an indirect function symbol nor we are building
1508 a static executable, those sections will be empty and
1509 won't appear in output. */
1510 switch (r_type)
1511 {
1512 default:
1513 break;
1514
1515 case R_386_32:
1516 case R_386_PC32:
1517 case R_386_PLT32:
1518 case R_386_GOT32:
1519 case R_386_GOTOFF:
1520 if (htab->elf.dynobj == NULL)
1521 htab->elf.dynobj = abfd;
1522 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1523 return FALSE;
1524 break;
1525 }
1526
1527 /* It is referenced by a non-shared object. */
1528 h->ref_regular = 1;
1529 }
1530
1531 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1532 symtab_hdr, sym_hashes,
1533 &r_type, GOT_UNKNOWN,
1534 rel, rel_end, h, r_symndx))
1535 return FALSE;
1536
1537 switch (r_type)
1538 {
1539 case R_386_TLS_LDM:
1540 htab->tls_ldm_got.refcount += 1;
1541 goto create_got;
1542
1543 case R_386_PLT32:
1544 /* This symbol requires a procedure linkage table entry. We
1545 actually build the entry in adjust_dynamic_symbol,
1546 because this might be a case of linking PIC code which is
1547 never referenced by a dynamic object, in which case we
1548 don't need to generate a procedure linkage table entry
1549 after all. */
1550
1551 /* If this is a local symbol, we resolve it directly without
1552 creating a procedure linkage table entry. */
1553 if (h == NULL)
1554 continue;
1555
1556 h->needs_plt = 1;
1557 h->plt.refcount += 1;
1558 break;
1559
1560 case R_386_SIZE32:
1561 size_reloc = TRUE;
1562 goto do_size;
1563
1564 case R_386_TLS_IE_32:
1565 case R_386_TLS_IE:
1566 case R_386_TLS_GOTIE:
1567 if (!info->executable)
1568 info->flags |= DF_STATIC_TLS;
1569 /* Fall through */
1570
1571 case R_386_GOT32:
1572 case R_386_TLS_GD:
1573 case R_386_TLS_GOTDESC:
1574 case R_386_TLS_DESC_CALL:
1575 /* This symbol requires a global offset table entry. */
1576 {
1577 int tls_type, old_tls_type;
1578
1579 switch (r_type)
1580 {
1581 default:
1582 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1583 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1584 case R_386_TLS_GOTDESC:
1585 case R_386_TLS_DESC_CALL:
1586 tls_type = GOT_TLS_GDESC; break;
1587 case R_386_TLS_IE_32:
1588 if (ELF32_R_TYPE (rel->r_info) == r_type)
1589 tls_type = GOT_TLS_IE_NEG;
1590 else
1591 /* If this is a GD->IE transition, we may use either of
1592 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1593 tls_type = GOT_TLS_IE;
1594 break;
1595 case R_386_TLS_IE:
1596 case R_386_TLS_GOTIE:
1597 tls_type = GOT_TLS_IE_POS; break;
1598 }
1599
1600 if (h != NULL)
1601 {
1602 h->got.refcount += 1;
1603 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1604 }
1605 else
1606 {
1607 bfd_signed_vma *local_got_refcounts;
1608
1609 /* This is a global offset table entry for a local symbol. */
1610 local_got_refcounts = elf_local_got_refcounts (abfd);
1611 if (local_got_refcounts == NULL)
1612 {
1613 bfd_size_type size;
1614
1615 size = symtab_hdr->sh_info;
1616 size *= (sizeof (bfd_signed_vma)
1617 + sizeof (bfd_vma) + sizeof(char));
1618 local_got_refcounts = (bfd_signed_vma *)
1619 bfd_zalloc (abfd, size);
1620 if (local_got_refcounts == NULL)
1621 return FALSE;
1622 elf_local_got_refcounts (abfd) = local_got_refcounts;
1623 elf_i386_local_tlsdesc_gotent (abfd)
1624 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1625 elf_i386_local_got_tls_type (abfd)
1626 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1627 }
1628 local_got_refcounts[r_symndx] += 1;
1629 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1630 }
1631
1632 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1633 tls_type |= old_tls_type;
1634 /* If a TLS symbol is accessed using IE at least once,
1635 there is no point to use dynamic model for it. */
1636 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1637 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1638 || (tls_type & GOT_TLS_IE) == 0))
1639 {
1640 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1641 tls_type = old_tls_type;
1642 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1643 && GOT_TLS_GD_ANY_P (tls_type))
1644 tls_type |= old_tls_type;
1645 else
1646 {
1647 if (h)
1648 name = h->root.root.string;
1649 else
1650 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1651 NULL);
1652 (*_bfd_error_handler)
1653 (_("%B: `%s' accessed both as normal and "
1654 "thread local symbol"),
1655 abfd, name);
1656 bfd_set_error (bfd_error_bad_value);
1657 return FALSE;
1658 }
1659 }
1660
1661 if (old_tls_type != tls_type)
1662 {
1663 if (h != NULL)
1664 elf_i386_hash_entry (h)->tls_type = tls_type;
1665 else
1666 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1667 }
1668 }
1669 /* Fall through */
1670
1671 case R_386_GOTOFF:
1672 case R_386_GOTPC:
1673 create_got:
1674 if (htab->elf.sgot == NULL)
1675 {
1676 if (htab->elf.dynobj == NULL)
1677 htab->elf.dynobj = abfd;
1678 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1679 return FALSE;
1680 }
1681 if (r_type != R_386_TLS_IE)
1682 break;
1683 /* Fall through */
1684
1685 case R_386_TLS_LE_32:
1686 case R_386_TLS_LE:
1687 if (info->executable)
1688 break;
1689 info->flags |= DF_STATIC_TLS;
1690 /* Fall through */
1691
1692 case R_386_32:
1693 case R_386_PC32:
1694 if (h != NULL && info->executable)
1695 {
1696 /* If this reloc is in a read-only section, we might
1697 need a copy reloc. We can't check reliably at this
1698 stage whether the section is read-only, as input
1699 sections have not yet been mapped to output sections.
1700 Tentatively set the flag for now, and correct in
1701 adjust_dynamic_symbol. */
1702 h->non_got_ref = 1;
1703
1704 /* We may need a .plt entry if the function this reloc
1705 refers to is in a shared lib. */
1706 h->plt.refcount += 1;
1707 if (r_type != R_386_PC32)
1708 h->pointer_equality_needed = 1;
1709 }
1710
1711 size_reloc = FALSE;
1712 do_size:
1713 /* If we are creating a shared library, and this is a reloc
1714 against a global symbol, or a non PC relative reloc
1715 against a local symbol, then we need to copy the reloc
1716 into the shared library. However, if we are linking with
1717 -Bsymbolic, we do not need to copy a reloc against a
1718 global symbol which is defined in an object we are
1719 including in the link (i.e., DEF_REGULAR is set). At
1720 this point we have not seen all the input files, so it is
1721 possible that DEF_REGULAR is not set now but will be set
1722 later (it is never cleared). In case of a weak definition,
1723 DEF_REGULAR may be cleared later by a strong definition in
1724 a shared library. We account for that possibility below by
1725 storing information in the relocs_copied field of the hash
1726 table entry. A similar situation occurs when creating
1727 shared libraries and symbol visibility changes render the
1728 symbol local.
1729
1730 If on the other hand, we are creating an executable, we
1731 may need to keep relocations for symbols satisfied by a
1732 dynamic library if we manage to avoid copy relocs for the
1733 symbol. */
1734 if ((info->shared
1735 && (sec->flags & SEC_ALLOC) != 0
1736 && (r_type != R_386_PC32
1737 || (h != NULL
1738 && (! SYMBOLIC_BIND (info, h)
1739 || h->root.type == bfd_link_hash_defweak
1740 || !h->def_regular))))
1741 || (ELIMINATE_COPY_RELOCS
1742 && !info->shared
1743 && (sec->flags & SEC_ALLOC) != 0
1744 && h != NULL
1745 && (h->root.type == bfd_link_hash_defweak
1746 || !h->def_regular)))
1747 {
1748 struct elf_dyn_relocs *p;
1749 struct elf_dyn_relocs **head;
1750
1751 /* We must copy these reloc types into the output file.
1752 Create a reloc section in dynobj and make room for
1753 this reloc. */
1754 if (sreloc == NULL)
1755 {
1756 if (htab->elf.dynobj == NULL)
1757 htab->elf.dynobj = abfd;
1758
1759 sreloc = _bfd_elf_make_dynamic_reloc_section
1760 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1761
1762 if (sreloc == NULL)
1763 return FALSE;
1764 }
1765
1766 /* If this is a global symbol, we count the number of
1767 relocations we need for this symbol. */
1768 if (h != NULL)
1769 {
1770 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1771 }
1772 else
1773 {
1774 /* Track dynamic relocs needed for local syms too.
1775 We really need local syms available to do this
1776 easily. Oh well. */
1777 void **vpp;
1778 asection *s;
1779
1780 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1781 abfd, r_symndx);
1782 if (isym == NULL)
1783 return FALSE;
1784
1785 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1786 if (s == NULL)
1787 s = sec;
1788
1789 vpp = &elf_section_data (s)->local_dynrel;
1790 head = (struct elf_dyn_relocs **)vpp;
1791 }
1792
1793 p = *head;
1794 if (p == NULL || p->sec != sec)
1795 {
1796 bfd_size_type amt = sizeof *p;
1797 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1798 amt);
1799 if (p == NULL)
1800 return FALSE;
1801 p->next = *head;
1802 *head = p;
1803 p->sec = sec;
1804 p->count = 0;
1805 p->pc_count = 0;
1806 }
1807
1808 p->count += 1;
1809 /* Count size relocation as PC-relative relocation. */
1810 if (r_type == R_386_PC32 || size_reloc)
1811 p->pc_count += 1;
1812 }
1813 break;
1814
1815 /* This relocation describes the C++ object vtable hierarchy.
1816 Reconstruct it for later use during GC. */
1817 case R_386_GNU_VTINHERIT:
1818 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1819 return FALSE;
1820 break;
1821
1822 /* This relocation describes which C++ vtable entries are actually
1823 used. Record for later use during GC. */
1824 case R_386_GNU_VTENTRY:
1825 BFD_ASSERT (h != NULL);
1826 if (h != NULL
1827 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1828 return FALSE;
1829 break;
1830
1831 default:
1832 break;
1833 }
1834 }
1835
1836 return TRUE;
1837 }
1838
1839 /* Return the section that should be marked against GC for a given
1840 relocation. */
1841
1842 static asection *
1843 elf_i386_gc_mark_hook (asection *sec,
1844 struct bfd_link_info *info,
1845 Elf_Internal_Rela *rel,
1846 struct elf_link_hash_entry *h,
1847 Elf_Internal_Sym *sym)
1848 {
1849 if (h != NULL)
1850 switch (ELF32_R_TYPE (rel->r_info))
1851 {
1852 case R_386_GNU_VTINHERIT:
1853 case R_386_GNU_VTENTRY:
1854 return NULL;
1855 }
1856
1857 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1858 }
1859
1860 /* Update the got entry reference counts for the section being removed. */
1861
1862 static bfd_boolean
1863 elf_i386_gc_sweep_hook (bfd *abfd,
1864 struct bfd_link_info *info,
1865 asection *sec,
1866 const Elf_Internal_Rela *relocs)
1867 {
1868 struct elf_i386_link_hash_table *htab;
1869 Elf_Internal_Shdr *symtab_hdr;
1870 struct elf_link_hash_entry **sym_hashes;
1871 bfd_signed_vma *local_got_refcounts;
1872 const Elf_Internal_Rela *rel, *relend;
1873
1874 if (info->relocatable)
1875 return TRUE;
1876
1877 htab = elf_i386_hash_table (info);
1878 if (htab == NULL)
1879 return FALSE;
1880
1881 elf_section_data (sec)->local_dynrel = NULL;
1882
1883 symtab_hdr = &elf_symtab_hdr (abfd);
1884 sym_hashes = elf_sym_hashes (abfd);
1885 local_got_refcounts = elf_local_got_refcounts (abfd);
1886
1887 relend = relocs + sec->reloc_count;
1888 for (rel = relocs; rel < relend; rel++)
1889 {
1890 unsigned long r_symndx;
1891 unsigned int r_type;
1892 struct elf_link_hash_entry *h = NULL;
1893
1894 r_symndx = ELF32_R_SYM (rel->r_info);
1895 if (r_symndx >= symtab_hdr->sh_info)
1896 {
1897 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1898 while (h->root.type == bfd_link_hash_indirect
1899 || h->root.type == bfd_link_hash_warning)
1900 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1901 }
1902 else
1903 {
1904 /* A local symbol. */
1905 Elf_Internal_Sym *isym;
1906
1907 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1908 abfd, r_symndx);
1909
1910 /* Check relocation against local STT_GNU_IFUNC symbol. */
1911 if (isym != NULL
1912 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1913 {
1914 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1915 if (h == NULL)
1916 abort ();
1917 }
1918 }
1919
1920 if (h)
1921 {
1922 struct elf_i386_link_hash_entry *eh;
1923 struct elf_dyn_relocs **pp;
1924 struct elf_dyn_relocs *p;
1925
1926 eh = (struct elf_i386_link_hash_entry *) h;
1927 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1928 if (p->sec == sec)
1929 {
1930 /* Everything must go for SEC. */
1931 *pp = p->next;
1932 break;
1933 }
1934 }
1935
1936 r_type = ELF32_R_TYPE (rel->r_info);
1937 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1938 symtab_hdr, sym_hashes,
1939 &r_type, GOT_UNKNOWN,
1940 rel, relend, h, r_symndx))
1941 return FALSE;
1942
1943 switch (r_type)
1944 {
1945 case R_386_TLS_LDM:
1946 if (htab->tls_ldm_got.refcount > 0)
1947 htab->tls_ldm_got.refcount -= 1;
1948 break;
1949
1950 case R_386_TLS_GD:
1951 case R_386_TLS_GOTDESC:
1952 case R_386_TLS_DESC_CALL:
1953 case R_386_TLS_IE_32:
1954 case R_386_TLS_IE:
1955 case R_386_TLS_GOTIE:
1956 case R_386_GOT32:
1957 if (h != NULL)
1958 {
1959 if (h->got.refcount > 0)
1960 h->got.refcount -= 1;
1961 if (h->type == STT_GNU_IFUNC)
1962 {
1963 if (h->plt.refcount > 0)
1964 h->plt.refcount -= 1;
1965 }
1966 }
1967 else if (local_got_refcounts != NULL)
1968 {
1969 if (local_got_refcounts[r_symndx] > 0)
1970 local_got_refcounts[r_symndx] -= 1;
1971 }
1972 break;
1973
1974 case R_386_32:
1975 case R_386_PC32:
1976 case R_386_SIZE32:
1977 if (info->shared
1978 && (h == NULL || h->type != STT_GNU_IFUNC))
1979 break;
1980 /* Fall through */
1981
1982 case R_386_PLT32:
1983 if (h != NULL)
1984 {
1985 if (h->plt.refcount > 0)
1986 h->plt.refcount -= 1;
1987 }
1988 break;
1989
1990 case R_386_GOTOFF:
1991 if (h != NULL && h->type == STT_GNU_IFUNC)
1992 {
1993 if (h->got.refcount > 0)
1994 h->got.refcount -= 1;
1995 if (h->plt.refcount > 0)
1996 h->plt.refcount -= 1;
1997 }
1998 break;
1999
2000 default:
2001 break;
2002 }
2003 }
2004
2005 return TRUE;
2006 }
2007
2008 /* Adjust a symbol defined by a dynamic object and referenced by a
2009 regular object. The current definition is in some section of the
2010 dynamic object, but we're not including those sections. We have to
2011 change the definition to something the rest of the link can
2012 understand. */
2013
2014 static bfd_boolean
2015 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2016 struct elf_link_hash_entry *h)
2017 {
2018 struct elf_i386_link_hash_table *htab;
2019 asection *s;
2020 struct elf_i386_link_hash_entry *eh;
2021 struct elf_dyn_relocs *p;
2022
2023 /* STT_GNU_IFUNC symbol must go through PLT. */
2024 if (h->type == STT_GNU_IFUNC)
2025 {
2026 /* All local STT_GNU_IFUNC references must be treate as local
2027 calls via local PLT. */
2028 if (h->ref_regular
2029 && SYMBOL_CALLS_LOCAL (info, h))
2030 {
2031 bfd_size_type pc_count = 0, count = 0;
2032 struct elf_dyn_relocs **pp;
2033
2034 eh = (struct elf_i386_link_hash_entry *) h;
2035 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2036 {
2037 pc_count += p->pc_count;
2038 p->count -= p->pc_count;
2039 p->pc_count = 0;
2040 count += p->count;
2041 if (p->count == 0)
2042 *pp = p->next;
2043 else
2044 pp = &p->next;
2045 }
2046
2047 if (pc_count || count)
2048 {
2049 h->needs_plt = 1;
2050 h->non_got_ref = 1;
2051 if (h->plt.refcount <= 0)
2052 h->plt.refcount = 1;
2053 else
2054 h->plt.refcount += 1;
2055 }
2056 }
2057
2058 if (h->plt.refcount <= 0)
2059 {
2060 h->plt.offset = (bfd_vma) -1;
2061 h->needs_plt = 0;
2062 }
2063 return TRUE;
2064 }
2065
2066 /* If this is a function, put it in the procedure linkage table. We
2067 will fill in the contents of the procedure linkage table later,
2068 when we know the address of the .got section. */
2069 if (h->type == STT_FUNC
2070 || h->needs_plt)
2071 {
2072 if (h->plt.refcount <= 0
2073 || SYMBOL_CALLS_LOCAL (info, h)
2074 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2075 && h->root.type == bfd_link_hash_undefweak))
2076 {
2077 /* This case can occur if we saw a PLT32 reloc in an input
2078 file, but the symbol was never referred to by a dynamic
2079 object, or if all references were garbage collected. In
2080 such a case, we don't actually need to build a procedure
2081 linkage table, and we can just do a PC32 reloc instead. */
2082 h->plt.offset = (bfd_vma) -1;
2083 h->needs_plt = 0;
2084 }
2085
2086 return TRUE;
2087 }
2088 else
2089 /* It's possible that we incorrectly decided a .plt reloc was
2090 needed for an R_386_PC32 reloc to a non-function sym in
2091 check_relocs. We can't decide accurately between function and
2092 non-function syms in check-relocs; Objects loaded later in
2093 the link may change h->type. So fix it now. */
2094 h->plt.offset = (bfd_vma) -1;
2095
2096 /* If this is a weak symbol, and there is a real definition, the
2097 processor independent code will have arranged for us to see the
2098 real definition first, and we can just use the same value. */
2099 if (h->u.weakdef != NULL)
2100 {
2101 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2102 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2103 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2104 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2105 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2106 h->non_got_ref = h->u.weakdef->non_got_ref;
2107 return TRUE;
2108 }
2109
2110 /* This is a reference to a symbol defined by a dynamic object which
2111 is not a function. */
2112
2113 /* If we are creating a shared library, we must presume that the
2114 only references to the symbol are via the global offset table.
2115 For such cases we need not do anything here; the relocations will
2116 be handled correctly by relocate_section. */
2117 if (info->shared)
2118 return TRUE;
2119
2120 /* If there are no references to this symbol that do not use the
2121 GOT, we don't need to generate a copy reloc. */
2122 if (!h->non_got_ref)
2123 return TRUE;
2124
2125 /* If -z nocopyreloc was given, we won't generate them either. */
2126 if (info->nocopyreloc)
2127 {
2128 h->non_got_ref = 0;
2129 return TRUE;
2130 }
2131
2132 htab = elf_i386_hash_table (info);
2133 if (htab == NULL)
2134 return FALSE;
2135
2136 /* If there aren't any dynamic relocs in read-only sections, then
2137 we can keep the dynamic relocs and avoid the copy reloc. This
2138 doesn't work on VxWorks, where we can not have dynamic relocations
2139 (other than copy and jump slot relocations) in an executable. */
2140 if (ELIMINATE_COPY_RELOCS
2141 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2142 {
2143 eh = (struct elf_i386_link_hash_entry *) h;
2144 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2145 {
2146 s = p->sec->output_section;
2147 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2148 break;
2149 }
2150
2151 if (p == NULL)
2152 {
2153 h->non_got_ref = 0;
2154 return TRUE;
2155 }
2156 }
2157
2158 /* We must allocate the symbol in our .dynbss section, which will
2159 become part of the .bss section of the executable. There will be
2160 an entry for this symbol in the .dynsym section. The dynamic
2161 object will contain position independent code, so all references
2162 from the dynamic object to this symbol will go through the global
2163 offset table. The dynamic linker will use the .dynsym entry to
2164 determine the address it must put in the global offset table, so
2165 both the dynamic object and the regular object will refer to the
2166 same memory location for the variable. */
2167
2168 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2169 copy the initial value out of the dynamic object and into the
2170 runtime process image. */
2171 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2172 {
2173 htab->srelbss->size += sizeof (Elf32_External_Rel);
2174 h->needs_copy = 1;
2175 }
2176
2177 s = htab->sdynbss;
2178
2179 return _bfd_elf_adjust_dynamic_copy (h, s);
2180 }
2181
2182 /* Allocate space in .plt, .got and associated reloc sections for
2183 dynamic relocs. */
2184
2185 static bfd_boolean
2186 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2187 {
2188 struct bfd_link_info *info;
2189 struct elf_i386_link_hash_table *htab;
2190 struct elf_i386_link_hash_entry *eh;
2191 struct elf_dyn_relocs *p;
2192 unsigned plt_entry_size;
2193
2194 if (h->root.type == bfd_link_hash_indirect)
2195 return TRUE;
2196
2197 eh = (struct elf_i386_link_hash_entry *) h;
2198
2199 info = (struct bfd_link_info *) inf;
2200 htab = elf_i386_hash_table (info);
2201 if (htab == NULL)
2202 return FALSE;
2203
2204 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2205
2206 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2207 here if it is defined and referenced in a non-shared object. */
2208 if (h->type == STT_GNU_IFUNC
2209 && h->def_regular)
2210 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2211 plt_entry_size, 4);
2212 else if (htab->elf.dynamic_sections_created
2213 && h->plt.refcount > 0)
2214 {
2215 /* Make sure this symbol is output as a dynamic symbol.
2216 Undefined weak syms won't yet be marked as dynamic. */
2217 if (h->dynindx == -1
2218 && !h->forced_local)
2219 {
2220 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2221 return FALSE;
2222 }
2223
2224 if (info->shared
2225 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2226 {
2227 asection *s = htab->elf.splt;
2228
2229 /* If this is the first .plt entry, make room for the special
2230 first entry. */
2231 if (s->size == 0)
2232 s->size += plt_entry_size;
2233
2234 h->plt.offset = s->size;
2235
2236 /* If this symbol is not defined in a regular file, and we are
2237 not generating a shared library, then set the symbol to this
2238 location in the .plt. This is required to make function
2239 pointers compare as equal between the normal executable and
2240 the shared library. */
2241 if (! info->shared
2242 && !h->def_regular)
2243 {
2244 h->root.u.def.section = s;
2245 h->root.u.def.value = h->plt.offset;
2246 }
2247
2248 /* Make room for this entry. */
2249 s->size += plt_entry_size;
2250
2251 /* We also need to make an entry in the .got.plt section, which
2252 will be placed in the .got section by the linker script. */
2253 htab->elf.sgotplt->size += 4;
2254
2255 /* We also need to make an entry in the .rel.plt section. */
2256 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2257 htab->elf.srelplt->reloc_count++;
2258
2259 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2260 && !info->shared)
2261 {
2262 /* VxWorks has a second set of relocations for each PLT entry
2263 in executables. They go in a separate relocation section,
2264 which is processed by the kernel loader. */
2265
2266 /* There are two relocations for the initial PLT entry: an
2267 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2268 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2269
2270 if (h->plt.offset == plt_entry_size)
2271 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2272
2273 /* There are two extra relocations for each subsequent PLT entry:
2274 an R_386_32 relocation for the GOT entry, and an R_386_32
2275 relocation for the PLT entry. */
2276
2277 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2278 }
2279 }
2280 else
2281 {
2282 h->plt.offset = (bfd_vma) -1;
2283 h->needs_plt = 0;
2284 }
2285 }
2286 else
2287 {
2288 h->plt.offset = (bfd_vma) -1;
2289 h->needs_plt = 0;
2290 }
2291
2292 eh->tlsdesc_got = (bfd_vma) -1;
2293
2294 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2295 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2296 if (h->got.refcount > 0
2297 && info->executable
2298 && h->dynindx == -1
2299 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2300 h->got.offset = (bfd_vma) -1;
2301 else if (h->got.refcount > 0)
2302 {
2303 asection *s;
2304 bfd_boolean dyn;
2305 int tls_type = elf_i386_hash_entry(h)->tls_type;
2306
2307 /* Make sure this symbol is output as a dynamic symbol.
2308 Undefined weak syms won't yet be marked as dynamic. */
2309 if (h->dynindx == -1
2310 && !h->forced_local)
2311 {
2312 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2313 return FALSE;
2314 }
2315
2316 s = htab->elf.sgot;
2317 if (GOT_TLS_GDESC_P (tls_type))
2318 {
2319 eh->tlsdesc_got = htab->elf.sgotplt->size
2320 - elf_i386_compute_jump_table_size (htab);
2321 htab->elf.sgotplt->size += 8;
2322 h->got.offset = (bfd_vma) -2;
2323 }
2324 if (! GOT_TLS_GDESC_P (tls_type)
2325 || GOT_TLS_GD_P (tls_type))
2326 {
2327 h->got.offset = s->size;
2328 s->size += 4;
2329 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2330 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2331 s->size += 4;
2332 }
2333 dyn = htab->elf.dynamic_sections_created;
2334 /* R_386_TLS_IE_32 needs one dynamic relocation,
2335 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2336 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2337 need two), R_386_TLS_GD needs one if local symbol and two if
2338 global. */
2339 if (tls_type == GOT_TLS_IE_BOTH)
2340 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2341 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2342 || (tls_type & GOT_TLS_IE))
2343 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2344 else if (GOT_TLS_GD_P (tls_type))
2345 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2346 else if (! GOT_TLS_GDESC_P (tls_type)
2347 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2348 || h->root.type != bfd_link_hash_undefweak)
2349 && (info->shared
2350 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2351 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2352 if (GOT_TLS_GDESC_P (tls_type))
2353 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2354 }
2355 else
2356 h->got.offset = (bfd_vma) -1;
2357
2358 if (eh->dyn_relocs == NULL)
2359 return TRUE;
2360
2361 /* In the shared -Bsymbolic case, discard space allocated for
2362 dynamic pc-relative relocs against symbols which turn out to be
2363 defined in regular objects. For the normal shared case, discard
2364 space for pc-relative relocs that have become local due to symbol
2365 visibility changes. */
2366
2367 if (info->shared)
2368 {
2369 /* The only reloc that uses pc_count is R_386_PC32, which will
2370 appear on a call or on something like ".long foo - .". We
2371 want calls to protected symbols to resolve directly to the
2372 function rather than going via the plt. If people want
2373 function pointer comparisons to work as expected then they
2374 should avoid writing assembly like ".long foo - .". */
2375 if (SYMBOL_CALLS_LOCAL (info, h))
2376 {
2377 struct elf_dyn_relocs **pp;
2378
2379 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2380 {
2381 p->count -= p->pc_count;
2382 p->pc_count = 0;
2383 if (p->count == 0)
2384 *pp = p->next;
2385 else
2386 pp = &p->next;
2387 }
2388 }
2389
2390 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2391 {
2392 struct elf_dyn_relocs **pp;
2393 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2394 {
2395 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2396 *pp = p->next;
2397 else
2398 pp = &p->next;
2399 }
2400 }
2401
2402 /* Also discard relocs on undefined weak syms with non-default
2403 visibility. */
2404 if (eh->dyn_relocs != NULL
2405 && h->root.type == bfd_link_hash_undefweak)
2406 {
2407 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2408 eh->dyn_relocs = NULL;
2409
2410 /* Make sure undefined weak symbols are output as a dynamic
2411 symbol in PIEs. */
2412 else if (h->dynindx == -1
2413 && !h->forced_local)
2414 {
2415 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2416 return FALSE;
2417 }
2418 }
2419 }
2420 else if (ELIMINATE_COPY_RELOCS)
2421 {
2422 /* For the non-shared case, discard space for relocs against
2423 symbols which turn out to need copy relocs or are not
2424 dynamic. */
2425
2426 if (!h->non_got_ref
2427 && ((h->def_dynamic
2428 && !h->def_regular)
2429 || (htab->elf.dynamic_sections_created
2430 && (h->root.type == bfd_link_hash_undefweak
2431 || h->root.type == bfd_link_hash_undefined))))
2432 {
2433 /* Make sure this symbol is output as a dynamic symbol.
2434 Undefined weak syms won't yet be marked as dynamic. */
2435 if (h->dynindx == -1
2436 && !h->forced_local)
2437 {
2438 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2439 return FALSE;
2440 }
2441
2442 /* If that succeeded, we know we'll be keeping all the
2443 relocs. */
2444 if (h->dynindx != -1)
2445 goto keep;
2446 }
2447
2448 eh->dyn_relocs = NULL;
2449
2450 keep: ;
2451 }
2452
2453 /* Finally, allocate space. */
2454 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2455 {
2456 asection *sreloc;
2457
2458 sreloc = elf_section_data (p->sec)->sreloc;
2459
2460 BFD_ASSERT (sreloc != NULL);
2461 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2462 }
2463
2464 return TRUE;
2465 }
2466
2467 /* Allocate space in .plt, .got and associated reloc sections for
2468 local dynamic relocs. */
2469
2470 static bfd_boolean
2471 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2472 {
2473 struct elf_link_hash_entry *h
2474 = (struct elf_link_hash_entry *) *slot;
2475
2476 if (h->type != STT_GNU_IFUNC
2477 || !h->def_regular
2478 || !h->ref_regular
2479 || !h->forced_local
2480 || h->root.type != bfd_link_hash_defined)
2481 abort ();
2482
2483 return elf_i386_allocate_dynrelocs (h, inf);
2484 }
2485
2486 /* Find any dynamic relocs that apply to read-only sections. */
2487
2488 static bfd_boolean
2489 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2490 {
2491 struct elf_i386_link_hash_entry *eh;
2492 struct elf_dyn_relocs *p;
2493
2494 /* Skip local IFUNC symbols. */
2495 if (h->forced_local && h->type == STT_GNU_IFUNC)
2496 return TRUE;
2497
2498 eh = (struct elf_i386_link_hash_entry *) h;
2499 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2500 {
2501 asection *s = p->sec->output_section;
2502
2503 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2504 {
2505 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2506
2507 info->flags |= DF_TEXTREL;
2508
2509 if (info->warn_shared_textrel && info->shared)
2510 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2511 p->sec->owner, h->root.root.string,
2512 p->sec);
2513
2514 /* Not an error, just cut short the traversal. */
2515 return FALSE;
2516 }
2517 }
2518 return TRUE;
2519 }
2520
2521 /* Convert
2522 mov foo@GOT(%reg), %reg
2523 to
2524 lea foo@GOTOFF(%reg), %reg
2525 with the local symbol, foo. */
2526
2527 static bfd_boolean
2528 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2529 struct bfd_link_info *link_info)
2530 {
2531 Elf_Internal_Shdr *symtab_hdr;
2532 Elf_Internal_Rela *internal_relocs;
2533 Elf_Internal_Rela *irel, *irelend;
2534 bfd_byte *contents;
2535 struct elf_i386_link_hash_table *htab;
2536 bfd_boolean changed_contents;
2537 bfd_boolean changed_relocs;
2538 bfd_signed_vma *local_got_refcounts;
2539
2540 /* Don't even try to convert non-ELF outputs. */
2541 if (!is_elf_hash_table (link_info->hash))
2542 return FALSE;
2543
2544 /* Nothing to do if there are no codes, no relocations or no output. */
2545 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2546 || sec->reloc_count == 0
2547 || discarded_section (sec))
2548 return TRUE;
2549
2550 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2551
2552 /* Load the relocations for this section. */
2553 internal_relocs = (_bfd_elf_link_read_relocs
2554 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2555 link_info->keep_memory));
2556 if (internal_relocs == NULL)
2557 return FALSE;
2558
2559 htab = elf_i386_hash_table (link_info);
2560 changed_contents = FALSE;
2561 changed_relocs = FALSE;
2562 local_got_refcounts = elf_local_got_refcounts (abfd);
2563
2564 /* Get the section contents. */
2565 if (elf_section_data (sec)->this_hdr.contents != NULL)
2566 contents = elf_section_data (sec)->this_hdr.contents;
2567 else
2568 {
2569 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2570 goto error_return;
2571 }
2572
2573 irelend = internal_relocs + sec->reloc_count;
2574 for (irel = internal_relocs; irel < irelend; irel++)
2575 {
2576 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2577 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2578 unsigned int indx;
2579 struct elf_link_hash_entry *h;
2580
2581 if (r_type != R_386_GOT32)
2582 continue;
2583
2584 /* Get the symbol referred to by the reloc. */
2585 if (r_symndx < symtab_hdr->sh_info)
2586 {
2587 Elf_Internal_Sym *isym;
2588
2589 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2590 abfd, r_symndx);
2591
2592 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2593 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2594 && bfd_get_8 (input_bfd,
2595 contents + irel->r_offset - 2) == 0x8b)
2596 {
2597 bfd_put_8 (output_bfd, 0x8d,
2598 contents + irel->r_offset - 2);
2599 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2600 if (local_got_refcounts != NULL
2601 && local_got_refcounts[r_symndx] > 0)
2602 local_got_refcounts[r_symndx] -= 1;
2603 changed_contents = TRUE;
2604 changed_relocs = TRUE;
2605 }
2606 continue;
2607 }
2608
2609 indx = r_symndx - symtab_hdr->sh_info;
2610 h = elf_sym_hashes (abfd)[indx];
2611 BFD_ASSERT (h != NULL);
2612
2613 while (h->root.type == bfd_link_hash_indirect
2614 || h->root.type == bfd_link_hash_warning)
2615 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2616
2617 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2618 optimizing _DYNAMIC since ld.so may use its link-time address. */
2619 if (h->def_regular
2620 && h->type != STT_GNU_IFUNC
2621 && h != htab->elf.hdynamic
2622 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2623 && bfd_get_8 (input_bfd,
2624 contents + irel->r_offset - 2) == 0x8b)
2625 {
2626 bfd_put_8 (output_bfd, 0x8d,
2627 contents + irel->r_offset - 2);
2628 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2629 if (h->got.refcount > 0)
2630 h->got.refcount -= 1;
2631 changed_contents = TRUE;
2632 changed_relocs = TRUE;
2633 }
2634 }
2635
2636 if (contents != NULL
2637 && elf_section_data (sec)->this_hdr.contents != contents)
2638 {
2639 if (!changed_contents && !link_info->keep_memory)
2640 free (contents);
2641 else
2642 {
2643 /* Cache the section contents for elf_link_input_bfd. */
2644 elf_section_data (sec)->this_hdr.contents = contents;
2645 }
2646 }
2647
2648 if (elf_section_data (sec)->relocs != internal_relocs)
2649 {
2650 if (!changed_relocs)
2651 free (internal_relocs);
2652 else
2653 elf_section_data (sec)->relocs = internal_relocs;
2654 }
2655
2656 return TRUE;
2657
2658 error_return:
2659 if (contents != NULL
2660 && elf_section_data (sec)->this_hdr.contents != contents)
2661 free (contents);
2662 if (internal_relocs != NULL
2663 && elf_section_data (sec)->relocs != internal_relocs)
2664 free (internal_relocs);
2665 return FALSE;
2666 }
2667
2668 /* Set the sizes of the dynamic sections. */
2669
2670 static bfd_boolean
2671 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2672 {
2673 struct elf_i386_link_hash_table *htab;
2674 bfd *dynobj;
2675 asection *s;
2676 bfd_boolean relocs;
2677 bfd *ibfd;
2678
2679 htab = elf_i386_hash_table (info);
2680 if (htab == NULL)
2681 return FALSE;
2682 dynobj = htab->elf.dynobj;
2683 if (dynobj == NULL)
2684 abort ();
2685
2686 if (htab->elf.dynamic_sections_created)
2687 {
2688 /* Set the contents of the .interp section to the interpreter. */
2689 if (info->executable)
2690 {
2691 s = bfd_get_linker_section (dynobj, ".interp");
2692 if (s == NULL)
2693 abort ();
2694 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2695 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2696 }
2697 }
2698
2699 /* Set up .got offsets for local syms, and space for local dynamic
2700 relocs. */
2701 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2702 {
2703 bfd_signed_vma *local_got;
2704 bfd_signed_vma *end_local_got;
2705 char *local_tls_type;
2706 bfd_vma *local_tlsdesc_gotent;
2707 bfd_size_type locsymcount;
2708 Elf_Internal_Shdr *symtab_hdr;
2709 asection *srel;
2710
2711 if (! is_i386_elf (ibfd))
2712 continue;
2713
2714 for (s = ibfd->sections; s != NULL; s = s->next)
2715 {
2716 struct elf_dyn_relocs *p;
2717
2718 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2719 return FALSE;
2720
2721 for (p = ((struct elf_dyn_relocs *)
2722 elf_section_data (s)->local_dynrel);
2723 p != NULL;
2724 p = p->next)
2725 {
2726 if (!bfd_is_abs_section (p->sec)
2727 && bfd_is_abs_section (p->sec->output_section))
2728 {
2729 /* Input section has been discarded, either because
2730 it is a copy of a linkonce section or due to
2731 linker script /DISCARD/, so we'll be discarding
2732 the relocs too. */
2733 }
2734 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2735 && strcmp (p->sec->output_section->name,
2736 ".tls_vars") == 0)
2737 {
2738 /* Relocations in vxworks .tls_vars sections are
2739 handled specially by the loader. */
2740 }
2741 else if (p->count != 0)
2742 {
2743 srel = elf_section_data (p->sec)->sreloc;
2744 srel->size += p->count * sizeof (Elf32_External_Rel);
2745 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2746 && (info->flags & DF_TEXTREL) == 0)
2747 {
2748 info->flags |= DF_TEXTREL;
2749 if (info->warn_shared_textrel && info->shared)
2750 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2751 p->sec->owner, p->sec);
2752 }
2753 }
2754 }
2755 }
2756
2757 local_got = elf_local_got_refcounts (ibfd);
2758 if (!local_got)
2759 continue;
2760
2761 symtab_hdr = &elf_symtab_hdr (ibfd);
2762 locsymcount = symtab_hdr->sh_info;
2763 end_local_got = local_got + locsymcount;
2764 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2765 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2766 s = htab->elf.sgot;
2767 srel = htab->elf.srelgot;
2768 for (; local_got < end_local_got;
2769 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2770 {
2771 *local_tlsdesc_gotent = (bfd_vma) -1;
2772 if (*local_got > 0)
2773 {
2774 if (GOT_TLS_GDESC_P (*local_tls_type))
2775 {
2776 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2777 - elf_i386_compute_jump_table_size (htab);
2778 htab->elf.sgotplt->size += 8;
2779 *local_got = (bfd_vma) -2;
2780 }
2781 if (! GOT_TLS_GDESC_P (*local_tls_type)
2782 || GOT_TLS_GD_P (*local_tls_type))
2783 {
2784 *local_got = s->size;
2785 s->size += 4;
2786 if (GOT_TLS_GD_P (*local_tls_type)
2787 || *local_tls_type == GOT_TLS_IE_BOTH)
2788 s->size += 4;
2789 }
2790 if (info->shared
2791 || GOT_TLS_GD_ANY_P (*local_tls_type)
2792 || (*local_tls_type & GOT_TLS_IE))
2793 {
2794 if (*local_tls_type == GOT_TLS_IE_BOTH)
2795 srel->size += 2 * sizeof (Elf32_External_Rel);
2796 else if (GOT_TLS_GD_P (*local_tls_type)
2797 || ! GOT_TLS_GDESC_P (*local_tls_type))
2798 srel->size += sizeof (Elf32_External_Rel);
2799 if (GOT_TLS_GDESC_P (*local_tls_type))
2800 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2801 }
2802 }
2803 else
2804 *local_got = (bfd_vma) -1;
2805 }
2806 }
2807
2808 if (htab->tls_ldm_got.refcount > 0)
2809 {
2810 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2811 relocs. */
2812 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2813 htab->elf.sgot->size += 8;
2814 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2815 }
2816 else
2817 htab->tls_ldm_got.offset = -1;
2818
2819 /* Allocate global sym .plt and .got entries, and space for global
2820 sym dynamic relocs. */
2821 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2822
2823 /* Allocate .plt and .got entries, and space for local symbols. */
2824 htab_traverse (htab->loc_hash_table,
2825 elf_i386_allocate_local_dynrelocs,
2826 info);
2827
2828 /* For every jump slot reserved in the sgotplt, reloc_count is
2829 incremented. However, when we reserve space for TLS descriptors,
2830 it's not incremented, so in order to compute the space reserved
2831 for them, it suffices to multiply the reloc count by the jump
2832 slot size.
2833
2834 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2835 so that R_386_IRELATIVE entries come last. */
2836 if (htab->elf.srelplt)
2837 {
2838 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2839 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2840 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2841 }
2842 else if (htab->elf.irelplt)
2843 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2844
2845
2846 if (htab->elf.sgotplt)
2847 {
2848 /* Don't allocate .got.plt section if there are no GOT nor PLT
2849 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2850 if ((htab->elf.hgot == NULL
2851 || !htab->elf.hgot->ref_regular_nonweak)
2852 && (htab->elf.sgotplt->size
2853 == get_elf_backend_data (output_bfd)->got_header_size)
2854 && (htab->elf.splt == NULL
2855 || htab->elf.splt->size == 0)
2856 && (htab->elf.sgot == NULL
2857 || htab->elf.sgot->size == 0)
2858 && (htab->elf.iplt == NULL
2859 || htab->elf.iplt->size == 0)
2860 && (htab->elf.igotplt == NULL
2861 || htab->elf.igotplt->size == 0))
2862 htab->elf.sgotplt->size = 0;
2863 }
2864
2865
2866 if (htab->plt_eh_frame != NULL
2867 && htab->elf.splt != NULL
2868 && htab->elf.splt->size != 0
2869 && !bfd_is_abs_section (htab->elf.splt->output_section)
2870 && _bfd_elf_eh_frame_present (info))
2871 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2872
2873 /* We now have determined the sizes of the various dynamic sections.
2874 Allocate memory for them. */
2875 relocs = FALSE;
2876 for (s = dynobj->sections; s != NULL; s = s->next)
2877 {
2878 bfd_boolean strip_section = TRUE;
2879
2880 if ((s->flags & SEC_LINKER_CREATED) == 0)
2881 continue;
2882
2883 if (s == htab->elf.splt
2884 || s == htab->elf.sgot)
2885 {
2886 /* Strip this section if we don't need it; see the
2887 comment below. */
2888 /* We'd like to strip these sections if they aren't needed, but if
2889 we've exported dynamic symbols from them we must leave them.
2890 It's too late to tell BFD to get rid of the symbols. */
2891
2892 if (htab->elf.hplt != NULL)
2893 strip_section = FALSE;
2894 }
2895 else if (s == htab->elf.sgotplt
2896 || s == htab->elf.iplt
2897 || s == htab->elf.igotplt
2898 || s == htab->plt_eh_frame
2899 || s == htab->sdynbss)
2900 {
2901 /* Strip these too. */
2902 }
2903 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2904 {
2905 if (s->size != 0
2906 && s != htab->elf.srelplt
2907 && s != htab->srelplt2)
2908 relocs = TRUE;
2909
2910 /* We use the reloc_count field as a counter if we need
2911 to copy relocs into the output file. */
2912 s->reloc_count = 0;
2913 }
2914 else
2915 {
2916 /* It's not one of our sections, so don't allocate space. */
2917 continue;
2918 }
2919
2920 if (s->size == 0)
2921 {
2922 /* If we don't need this section, strip it from the
2923 output file. This is mostly to handle .rel.bss and
2924 .rel.plt. We must create both sections in
2925 create_dynamic_sections, because they must be created
2926 before the linker maps input sections to output
2927 sections. The linker does that before
2928 adjust_dynamic_symbol is called, and it is that
2929 function which decides whether anything needs to go
2930 into these sections. */
2931 if (strip_section)
2932 s->flags |= SEC_EXCLUDE;
2933 continue;
2934 }
2935
2936 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2937 continue;
2938
2939 /* Allocate memory for the section contents. We use bfd_zalloc
2940 here in case unused entries are not reclaimed before the
2941 section's contents are written out. This should not happen,
2942 but this way if it does, we get a R_386_NONE reloc instead
2943 of garbage. */
2944 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2945 if (s->contents == NULL)
2946 return FALSE;
2947 }
2948
2949 if (htab->plt_eh_frame != NULL
2950 && htab->plt_eh_frame->contents != NULL)
2951 {
2952 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2953 sizeof (elf_i386_eh_frame_plt));
2954 bfd_put_32 (dynobj, htab->elf.splt->size,
2955 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2956 }
2957
2958 if (htab->elf.dynamic_sections_created)
2959 {
2960 /* Add some entries to the .dynamic section. We fill in the
2961 values later, in elf_i386_finish_dynamic_sections, but we
2962 must add the entries now so that we get the correct size for
2963 the .dynamic section. The DT_DEBUG entry is filled in by the
2964 dynamic linker and used by the debugger. */
2965 #define add_dynamic_entry(TAG, VAL) \
2966 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2967
2968 if (info->executable)
2969 {
2970 if (!add_dynamic_entry (DT_DEBUG, 0))
2971 return FALSE;
2972 }
2973
2974 if (htab->elf.splt->size != 0)
2975 {
2976 if (!add_dynamic_entry (DT_PLTGOT, 0)
2977 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2978 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2979 || !add_dynamic_entry (DT_JMPREL, 0))
2980 return FALSE;
2981 }
2982
2983 if (relocs)
2984 {
2985 if (!add_dynamic_entry (DT_REL, 0)
2986 || !add_dynamic_entry (DT_RELSZ, 0)
2987 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2988 return FALSE;
2989
2990 /* If any dynamic relocs apply to a read-only section,
2991 then we need a DT_TEXTREL entry. */
2992 if ((info->flags & DF_TEXTREL) == 0)
2993 elf_link_hash_traverse (&htab->elf,
2994 elf_i386_readonly_dynrelocs, info);
2995
2996 if ((info->flags & DF_TEXTREL) != 0)
2997 {
2998 if (!add_dynamic_entry (DT_TEXTREL, 0))
2999 return FALSE;
3000 }
3001 }
3002 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3003 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3004 return FALSE;
3005 }
3006 #undef add_dynamic_entry
3007
3008 return TRUE;
3009 }
3010
3011 static bfd_boolean
3012 elf_i386_always_size_sections (bfd *output_bfd,
3013 struct bfd_link_info *info)
3014 {
3015 asection *tls_sec = elf_hash_table (info)->tls_sec;
3016
3017 if (tls_sec)
3018 {
3019 struct elf_link_hash_entry *tlsbase;
3020
3021 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3022 "_TLS_MODULE_BASE_",
3023 FALSE, FALSE, FALSE);
3024
3025 if (tlsbase && tlsbase->type == STT_TLS)
3026 {
3027 struct elf_i386_link_hash_table *htab;
3028 struct bfd_link_hash_entry *bh = NULL;
3029 const struct elf_backend_data *bed
3030 = get_elf_backend_data (output_bfd);
3031
3032 htab = elf_i386_hash_table (info);
3033 if (htab == NULL)
3034 return FALSE;
3035
3036 if (!(_bfd_generic_link_add_one_symbol
3037 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3038 tls_sec, 0, NULL, FALSE,
3039 bed->collect, &bh)))
3040 return FALSE;
3041
3042 htab->tls_module_base = bh;
3043
3044 tlsbase = (struct elf_link_hash_entry *)bh;
3045 tlsbase->def_regular = 1;
3046 tlsbase->other = STV_HIDDEN;
3047 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3048 }
3049 }
3050
3051 return TRUE;
3052 }
3053
3054 /* Set the correct type for an x86 ELF section. We do this by the
3055 section name, which is a hack, but ought to work. */
3056
3057 static bfd_boolean
3058 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3059 Elf_Internal_Shdr *hdr,
3060 asection *sec)
3061 {
3062 const char *name;
3063
3064 name = bfd_get_section_name (abfd, sec);
3065
3066 /* This is an ugly, but unfortunately necessary hack that is
3067 needed when producing EFI binaries on x86. It tells
3068 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3069 containing ELF relocation info. We need this hack in order to
3070 be able to generate ELF binaries that can be translated into
3071 EFI applications (which are essentially COFF objects). Those
3072 files contain a COFF ".reloc" section inside an ELFNN object,
3073 which would normally cause BFD to segfault because it would
3074 attempt to interpret this section as containing relocation
3075 entries for section "oc". With this hack enabled, ".reloc"
3076 will be treated as a normal data section, which will avoid the
3077 segfault. However, you won't be able to create an ELFNN binary
3078 with a section named "oc" that needs relocations, but that's
3079 the kind of ugly side-effects you get when detecting section
3080 types based on their names... In practice, this limitation is
3081 unlikely to bite. */
3082 if (strcmp (name, ".reloc") == 0)
3083 hdr->sh_type = SHT_PROGBITS;
3084
3085 return TRUE;
3086 }
3087
3088 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3089 executables. Rather than setting it to the beginning of the TLS
3090 section, we have to set it to the end. This function may be called
3091 multiple times, it is idempotent. */
3092
3093 static void
3094 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3095 {
3096 struct elf_i386_link_hash_table *htab;
3097 struct bfd_link_hash_entry *base;
3098
3099 if (!info->executable)
3100 return;
3101
3102 htab = elf_i386_hash_table (info);
3103 if (htab == NULL)
3104 return;
3105
3106 base = htab->tls_module_base;
3107 if (base == NULL)
3108 return;
3109
3110 base->u.def.value = htab->elf.tls_size;
3111 }
3112
3113 /* Return the base VMA address which should be subtracted from real addresses
3114 when resolving @dtpoff relocation.
3115 This is PT_TLS segment p_vaddr. */
3116
3117 static bfd_vma
3118 elf_i386_dtpoff_base (struct bfd_link_info *info)
3119 {
3120 /* If tls_sec is NULL, we should have signalled an error already. */
3121 if (elf_hash_table (info)->tls_sec == NULL)
3122 return 0;
3123 return elf_hash_table (info)->tls_sec->vma;
3124 }
3125
3126 /* Return the relocation value for @tpoff relocation
3127 if STT_TLS virtual address is ADDRESS. */
3128
3129 static bfd_vma
3130 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3131 {
3132 struct elf_link_hash_table *htab = elf_hash_table (info);
3133 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3134 bfd_vma static_tls_size;
3135
3136 /* If tls_sec is NULL, we should have signalled an error already. */
3137 if (htab->tls_sec == NULL)
3138 return 0;
3139
3140 /* Consider special static TLS alignment requirements. */
3141 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3142 return static_tls_size + htab->tls_sec->vma - address;
3143 }
3144
3145 /* Relocate an i386 ELF section. */
3146
3147 static bfd_boolean
3148 elf_i386_relocate_section (bfd *output_bfd,
3149 struct bfd_link_info *info,
3150 bfd *input_bfd,
3151 asection *input_section,
3152 bfd_byte *contents,
3153 Elf_Internal_Rela *relocs,
3154 Elf_Internal_Sym *local_syms,
3155 asection **local_sections)
3156 {
3157 struct elf_i386_link_hash_table *htab;
3158 Elf_Internal_Shdr *symtab_hdr;
3159 struct elf_link_hash_entry **sym_hashes;
3160 bfd_vma *local_got_offsets;
3161 bfd_vma *local_tlsdesc_gotents;
3162 Elf_Internal_Rela *rel;
3163 Elf_Internal_Rela *relend;
3164 bfd_boolean is_vxworks_tls;
3165 unsigned plt_entry_size;
3166
3167 BFD_ASSERT (is_i386_elf (input_bfd));
3168
3169 htab = elf_i386_hash_table (info);
3170 if (htab == NULL)
3171 return FALSE;
3172 symtab_hdr = &elf_symtab_hdr (input_bfd);
3173 sym_hashes = elf_sym_hashes (input_bfd);
3174 local_got_offsets = elf_local_got_offsets (input_bfd);
3175 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3176 /* We have to handle relocations in vxworks .tls_vars sections
3177 specially, because the dynamic loader is 'weird'. */
3178 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3179 && info->shared
3180 && !strcmp (input_section->output_section->name,
3181 ".tls_vars"));
3182
3183 elf_i386_set_tls_module_base (info);
3184
3185 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3186
3187 rel = relocs;
3188 relend = relocs + input_section->reloc_count;
3189 for (; rel < relend; rel++)
3190 {
3191 unsigned int r_type;
3192 reloc_howto_type *howto;
3193 unsigned long r_symndx;
3194 struct elf_link_hash_entry *h;
3195 Elf_Internal_Sym *sym;
3196 asection *sec;
3197 bfd_vma off, offplt;
3198 bfd_vma relocation;
3199 bfd_boolean unresolved_reloc;
3200 bfd_reloc_status_type r;
3201 unsigned int indx;
3202 int tls_type;
3203 bfd_vma st_size;
3204
3205 r_type = ELF32_R_TYPE (rel->r_info);
3206 if (r_type == R_386_GNU_VTINHERIT
3207 || r_type == R_386_GNU_VTENTRY)
3208 continue;
3209
3210 if ((indx = r_type) >= R_386_standard
3211 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3212 >= R_386_ext - R_386_standard)
3213 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3214 >= R_386_irelative - R_386_ext))
3215 {
3216 (*_bfd_error_handler)
3217 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3218 input_bfd, input_section, r_type);
3219 bfd_set_error (bfd_error_bad_value);
3220 return FALSE;
3221 }
3222 howto = elf_howto_table + indx;
3223
3224 r_symndx = ELF32_R_SYM (rel->r_info);
3225 h = NULL;
3226 sym = NULL;
3227 sec = NULL;
3228 unresolved_reloc = FALSE;
3229 if (r_symndx < symtab_hdr->sh_info)
3230 {
3231 sym = local_syms + r_symndx;
3232 sec = local_sections[r_symndx];
3233 relocation = (sec->output_section->vma
3234 + sec->output_offset
3235 + sym->st_value);
3236 st_size = sym->st_size;
3237
3238 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3239 && ((sec->flags & SEC_MERGE) != 0
3240 || (info->relocatable
3241 && sec->output_offset != 0)))
3242 {
3243 bfd_vma addend;
3244 bfd_byte *where = contents + rel->r_offset;
3245
3246 switch (howto->size)
3247 {
3248 case 0:
3249 addend = bfd_get_8 (input_bfd, where);
3250 if (howto->pc_relative)
3251 {
3252 addend = (addend ^ 0x80) - 0x80;
3253 addend += 1;
3254 }
3255 break;
3256 case 1:
3257 addend = bfd_get_16 (input_bfd, where);
3258 if (howto->pc_relative)
3259 {
3260 addend = (addend ^ 0x8000) - 0x8000;
3261 addend += 2;
3262 }
3263 break;
3264 case 2:
3265 addend = bfd_get_32 (input_bfd, where);
3266 if (howto->pc_relative)
3267 {
3268 addend = (addend ^ 0x80000000) - 0x80000000;
3269 addend += 4;
3270 }
3271 break;
3272 default:
3273 abort ();
3274 }
3275
3276 if (info->relocatable)
3277 addend += sec->output_offset;
3278 else
3279 {
3280 asection *msec = sec;
3281 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3282 addend);
3283 addend -= relocation;
3284 addend += msec->output_section->vma + msec->output_offset;
3285 }
3286
3287 switch (howto->size)
3288 {
3289 case 0:
3290 /* FIXME: overflow checks. */
3291 if (howto->pc_relative)
3292 addend -= 1;
3293 bfd_put_8 (input_bfd, addend, where);
3294 break;
3295 case 1:
3296 if (howto->pc_relative)
3297 addend -= 2;
3298 bfd_put_16 (input_bfd, addend, where);
3299 break;
3300 case 2:
3301 if (howto->pc_relative)
3302 addend -= 4;
3303 bfd_put_32 (input_bfd, addend, where);
3304 break;
3305 }
3306 }
3307 else if (!info->relocatable
3308 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3309 {
3310 /* Relocate against local STT_GNU_IFUNC symbol. */
3311 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3312 FALSE);
3313 if (h == NULL)
3314 abort ();
3315
3316 /* Set STT_GNU_IFUNC symbol value. */
3317 h->root.u.def.value = sym->st_value;
3318 h->root.u.def.section = sec;
3319 }
3320 }
3321 else
3322 {
3323 bfd_boolean warned ATTRIBUTE_UNUSED;
3324
3325 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3326 r_symndx, symtab_hdr, sym_hashes,
3327 h, sec, relocation,
3328 unresolved_reloc, warned);
3329 st_size = h->size;
3330 }
3331
3332 if (sec != NULL && discarded_section (sec))
3333 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3334 rel, 1, relend, howto, 0, contents);
3335
3336 if (info->relocatable)
3337 continue;
3338
3339 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3340 it here if it is defined in a non-shared object. */
3341 if (h != NULL
3342 && h->type == STT_GNU_IFUNC
3343 && h->def_regular)
3344 {
3345 asection *plt, *gotplt, *base_got;
3346 bfd_vma plt_index;
3347 const char *name;
3348
3349 if ((input_section->flags & SEC_ALLOC) == 0
3350 || h->plt.offset == (bfd_vma) -1)
3351 abort ();
3352
3353 /* STT_GNU_IFUNC symbol must go through PLT. */
3354 if (htab->elf.splt != NULL)
3355 {
3356 plt = htab->elf.splt;
3357 gotplt = htab->elf.sgotplt;
3358 }
3359 else
3360 {
3361 plt = htab->elf.iplt;
3362 gotplt = htab->elf.igotplt;
3363 }
3364
3365 relocation = (plt->output_section->vma
3366 + plt->output_offset + h->plt.offset);
3367
3368 switch (r_type)
3369 {
3370 default:
3371 if (h->root.root.string)
3372 name = h->root.root.string;
3373 else
3374 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3375 NULL);
3376 (*_bfd_error_handler)
3377 (_("%B: relocation %s against STT_GNU_IFUNC "
3378 "symbol `%s' isn't handled by %s"), input_bfd,
3379 elf_howto_table[r_type].name,
3380 name, __FUNCTION__);
3381 bfd_set_error (bfd_error_bad_value);
3382 return FALSE;
3383
3384 case R_386_32:
3385 /* Generate dynamic relcoation only when there is a
3386 non-GOT reference in a shared object. */
3387 if (info->shared && h->non_got_ref)
3388 {
3389 Elf_Internal_Rela outrel;
3390 asection *sreloc;
3391 bfd_vma offset;
3392
3393 /* Need a dynamic relocation to get the real function
3394 adddress. */
3395 offset = _bfd_elf_section_offset (output_bfd,
3396 info,
3397 input_section,
3398 rel->r_offset);
3399 if (offset == (bfd_vma) -1
3400 || offset == (bfd_vma) -2)
3401 abort ();
3402
3403 outrel.r_offset = (input_section->output_section->vma
3404 + input_section->output_offset
3405 + offset);
3406
3407 if (h->dynindx == -1
3408 || h->forced_local
3409 || info->executable)
3410 {
3411 /* This symbol is resolved locally. */
3412 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3413 bfd_put_32 (output_bfd,
3414 (h->root.u.def.value
3415 + h->root.u.def.section->output_section->vma
3416 + h->root.u.def.section->output_offset),
3417 contents + offset);
3418 }
3419 else
3420 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3421
3422 sreloc = htab->elf.irelifunc;
3423 elf_append_rel (output_bfd, sreloc, &outrel);
3424
3425 /* If this reloc is against an external symbol, we
3426 do not want to fiddle with the addend. Otherwise,
3427 we need to include the symbol value so that it
3428 becomes an addend for the dynamic reloc. For an
3429 internal symbol, we have updated addend. */
3430 continue;
3431 }
3432 /* FALLTHROUGH */
3433 case R_386_PC32:
3434 case R_386_PLT32:
3435 goto do_relocation;
3436
3437 case R_386_GOT32:
3438 base_got = htab->elf.sgot;
3439 off = h->got.offset;
3440
3441 if (base_got == NULL)
3442 abort ();
3443
3444 if (off == (bfd_vma) -1)
3445 {
3446 /* We can't use h->got.offset here to save state, or
3447 even just remember the offset, as finish_dynamic_symbol
3448 would use that as offset into .got. */
3449
3450 if (htab->elf.splt != NULL)
3451 {
3452 plt_index = h->plt.offset / plt_entry_size - 1;
3453 off = (plt_index + 3) * 4;
3454 base_got = htab->elf.sgotplt;
3455 }
3456 else
3457 {
3458 plt_index = h->plt.offset / plt_entry_size;
3459 off = plt_index * 4;
3460 base_got = htab->elf.igotplt;
3461 }
3462
3463 if (h->dynindx == -1
3464 || h->forced_local
3465 || info->symbolic)
3466 {
3467 /* This references the local defitionion. We must
3468 initialize this entry in the global offset table.
3469 Since the offset must always be a multiple of 8,
3470 we use the least significant bit to record
3471 whether we have initialized it already.
3472
3473 When doing a dynamic link, we create a .rela.got
3474 relocation entry to initialize the value. This
3475 is done in the finish_dynamic_symbol routine. */
3476 if ((off & 1) != 0)
3477 off &= ~1;
3478 else
3479 {
3480 bfd_put_32 (output_bfd, relocation,
3481 base_got->contents + off);
3482 h->got.offset |= 1;
3483 }
3484 }
3485
3486 relocation = off;
3487
3488 /* Adjust for static executables. */
3489 if (htab->elf.splt == NULL)
3490 relocation += gotplt->output_offset;
3491 }
3492 else
3493 {
3494 relocation = (base_got->output_section->vma
3495 + base_got->output_offset + off
3496 - gotplt->output_section->vma
3497 - gotplt->output_offset);
3498 /* Adjust for static executables. */
3499 if (htab->elf.splt == NULL)
3500 relocation += gotplt->output_offset;
3501 }
3502
3503 goto do_relocation;
3504
3505 case R_386_GOTOFF:
3506 relocation -= (gotplt->output_section->vma
3507 + gotplt->output_offset);
3508 goto do_relocation;
3509 }
3510 }
3511
3512 switch (r_type)
3513 {
3514 case R_386_GOT32:
3515 /* Relocation is to the entry for this symbol in the global
3516 offset table. */
3517 if (htab->elf.sgot == NULL)
3518 abort ();
3519
3520 if (h != NULL)
3521 {
3522 bfd_boolean dyn;
3523
3524 off = h->got.offset;
3525 dyn = htab->elf.dynamic_sections_created;
3526 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3527 || (info->shared
3528 && SYMBOL_REFERENCES_LOCAL (info, h))
3529 || (ELF_ST_VISIBILITY (h->other)
3530 && h->root.type == bfd_link_hash_undefweak))
3531 {
3532 /* This is actually a static link, or it is a
3533 -Bsymbolic link and the symbol is defined
3534 locally, or the symbol was forced to be local
3535 because of a version file. We must initialize
3536 this entry in the global offset table. Since the
3537 offset must always be a multiple of 4, we use the
3538 least significant bit to record whether we have
3539 initialized it already.
3540
3541 When doing a dynamic link, we create a .rel.got
3542 relocation entry to initialize the value. This
3543 is done in the finish_dynamic_symbol routine. */
3544 if ((off & 1) != 0)
3545 off &= ~1;
3546 else
3547 {
3548 bfd_put_32 (output_bfd, relocation,
3549 htab->elf.sgot->contents + off);
3550 h->got.offset |= 1;
3551 }
3552 }
3553 else
3554 unresolved_reloc = FALSE;
3555 }
3556 else
3557 {
3558 if (local_got_offsets == NULL)
3559 abort ();
3560
3561 off = local_got_offsets[r_symndx];
3562
3563 /* The offset must always be a multiple of 4. We use
3564 the least significant bit to record whether we have
3565 already generated the necessary reloc. */
3566 if ((off & 1) != 0)
3567 off &= ~1;
3568 else
3569 {
3570 bfd_put_32 (output_bfd, relocation,
3571 htab->elf.sgot->contents + off);
3572
3573 if (info->shared)
3574 {
3575 asection *s;
3576 Elf_Internal_Rela outrel;
3577
3578 s = htab->elf.srelgot;
3579 if (s == NULL)
3580 abort ();
3581
3582 outrel.r_offset = (htab->elf.sgot->output_section->vma
3583 + htab->elf.sgot->output_offset
3584 + off);
3585 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3586 elf_append_rel (output_bfd, s, &outrel);
3587 }
3588
3589 local_got_offsets[r_symndx] |= 1;
3590 }
3591 }
3592
3593 if (off >= (bfd_vma) -2)
3594 abort ();
3595
3596 relocation = htab->elf.sgot->output_section->vma
3597 + htab->elf.sgot->output_offset + off
3598 - htab->elf.sgotplt->output_section->vma
3599 - htab->elf.sgotplt->output_offset;
3600 break;
3601
3602 case R_386_GOTOFF:
3603 /* Relocation is relative to the start of the global offset
3604 table. */
3605
3606 /* Check to make sure it isn't a protected function symbol
3607 for shared library since it may not be local when used
3608 as function address. We also need to make sure that a
3609 symbol is defined locally. */
3610 if (info->shared && h)
3611 {
3612 if (!h->def_regular)
3613 {
3614 const char *v;
3615
3616 switch (ELF_ST_VISIBILITY (h->other))
3617 {
3618 case STV_HIDDEN:
3619 v = _("hidden symbol");
3620 break;
3621 case STV_INTERNAL:
3622 v = _("internal symbol");
3623 break;
3624 case STV_PROTECTED:
3625 v = _("protected symbol");
3626 break;
3627 default:
3628 v = _("symbol");
3629 break;
3630 }
3631
3632 (*_bfd_error_handler)
3633 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3634 input_bfd, v, h->root.root.string);
3635 bfd_set_error (bfd_error_bad_value);
3636 return FALSE;
3637 }
3638 else if (!info->executable
3639 && !SYMBOLIC_BIND (info, h)
3640 && h->type == STT_FUNC
3641 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3642 {
3643 (*_bfd_error_handler)
3644 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3645 input_bfd, h->root.root.string);
3646 bfd_set_error (bfd_error_bad_value);
3647 return FALSE;
3648 }
3649 }
3650
3651 /* Note that sgot is not involved in this
3652 calculation. We always want the start of .got.plt. If we
3653 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3654 permitted by the ABI, we might have to change this
3655 calculation. */
3656 relocation -= htab->elf.sgotplt->output_section->vma
3657 + htab->elf.sgotplt->output_offset;
3658 break;
3659
3660 case R_386_GOTPC:
3661 /* Use global offset table as symbol value. */
3662 relocation = htab->elf.sgotplt->output_section->vma
3663 + htab->elf.sgotplt->output_offset;
3664 unresolved_reloc = FALSE;
3665 break;
3666
3667 case R_386_PLT32:
3668 /* Relocation is to the entry for this symbol in the
3669 procedure linkage table. */
3670
3671 /* Resolve a PLT32 reloc against a local symbol directly,
3672 without using the procedure linkage table. */
3673 if (h == NULL)
3674 break;
3675
3676 if (h->plt.offset == (bfd_vma) -1
3677 || htab->elf.splt == NULL)
3678 {
3679 /* We didn't make a PLT entry for this symbol. This
3680 happens when statically linking PIC code, or when
3681 using -Bsymbolic. */
3682 break;
3683 }
3684
3685 relocation = (htab->elf.splt->output_section->vma
3686 + htab->elf.splt->output_offset
3687 + h->plt.offset);
3688 unresolved_reloc = FALSE;
3689 break;
3690
3691 case R_386_SIZE32:
3692 /* Set to symbol size. */
3693 relocation = st_size;
3694 /* Fall through. */
3695
3696 case R_386_32:
3697 case R_386_PC32:
3698 if ((input_section->flags & SEC_ALLOC) == 0
3699 || is_vxworks_tls)
3700 break;
3701
3702 if ((info->shared
3703 && (h == NULL
3704 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3705 || h->root.type != bfd_link_hash_undefweak)
3706 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3707 || !SYMBOL_CALLS_LOCAL (info, h)))
3708 || (ELIMINATE_COPY_RELOCS
3709 && !info->shared
3710 && h != NULL
3711 && h->dynindx != -1
3712 && !h->non_got_ref
3713 && ((h->def_dynamic
3714 && !h->def_regular)
3715 || h->root.type == bfd_link_hash_undefweak
3716 || h->root.type == bfd_link_hash_undefined)))
3717 {
3718 Elf_Internal_Rela outrel;
3719 bfd_boolean skip, relocate;
3720 asection *sreloc;
3721
3722 /* When generating a shared object, these relocations
3723 are copied into the output file to be resolved at run
3724 time. */
3725
3726 skip = FALSE;
3727 relocate = FALSE;
3728
3729 outrel.r_offset =
3730 _bfd_elf_section_offset (output_bfd, info, input_section,
3731 rel->r_offset);
3732 if (outrel.r_offset == (bfd_vma) -1)
3733 skip = TRUE;
3734 else if (outrel.r_offset == (bfd_vma) -2)
3735 skip = TRUE, relocate = TRUE;
3736 outrel.r_offset += (input_section->output_section->vma
3737 + input_section->output_offset);
3738
3739 if (skip)
3740 memset (&outrel, 0, sizeof outrel);
3741 else if (h != NULL
3742 && h->dynindx != -1
3743 && (r_type == R_386_PC32
3744 || !info->shared
3745 || !SYMBOLIC_BIND (info, h)
3746 || !h->def_regular))
3747 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3748 else
3749 {
3750 /* This symbol is local, or marked to become local. */
3751 relocate = TRUE;
3752 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3753 }
3754
3755 sreloc = elf_section_data (input_section)->sreloc;
3756
3757 if (sreloc == NULL || sreloc->contents == NULL)
3758 {
3759 r = bfd_reloc_notsupported;
3760 goto check_relocation_error;
3761 }
3762
3763 elf_append_rel (output_bfd, sreloc, &outrel);
3764
3765 /* If this reloc is against an external symbol, we do
3766 not want to fiddle with the addend. Otherwise, we
3767 need to include the symbol value so that it becomes
3768 an addend for the dynamic reloc. */
3769 if (! relocate)
3770 continue;
3771 }
3772 break;
3773
3774 case R_386_TLS_IE:
3775 if (!info->executable)
3776 {
3777 Elf_Internal_Rela outrel;
3778 asection *sreloc;
3779
3780 outrel.r_offset = rel->r_offset
3781 + input_section->output_section->vma
3782 + input_section->output_offset;
3783 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3784 sreloc = elf_section_data (input_section)->sreloc;
3785 if (sreloc == NULL)
3786 abort ();
3787 elf_append_rel (output_bfd, sreloc, &outrel);
3788 }
3789 /* Fall through */
3790
3791 case R_386_TLS_GD:
3792 case R_386_TLS_GOTDESC:
3793 case R_386_TLS_DESC_CALL:
3794 case R_386_TLS_IE_32:
3795 case R_386_TLS_GOTIE:
3796 tls_type = GOT_UNKNOWN;
3797 if (h == NULL && local_got_offsets)
3798 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3799 else if (h != NULL)
3800 tls_type = elf_i386_hash_entry(h)->tls_type;
3801 if (tls_type == GOT_TLS_IE)
3802 tls_type = GOT_TLS_IE_NEG;
3803
3804 if (! elf_i386_tls_transition (info, input_bfd,
3805 input_section, contents,
3806 symtab_hdr, sym_hashes,
3807 &r_type, tls_type, rel,
3808 relend, h, r_symndx))
3809 return FALSE;
3810
3811 if (r_type == R_386_TLS_LE_32)
3812 {
3813 BFD_ASSERT (! unresolved_reloc);
3814 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3815 {
3816 unsigned int type;
3817 bfd_vma roff;
3818
3819 /* GD->LE transition. */
3820 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3821 if (type == 0x04)
3822 {
3823 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3824 Change it into:
3825 movl %gs:0, %eax; subl $foo@tpoff, %eax
3826 (6 byte form of subl). */
3827 memcpy (contents + rel->r_offset - 3,
3828 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3829 roff = rel->r_offset + 5;
3830 }
3831 else
3832 {
3833 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3834 Change it into:
3835 movl %gs:0, %eax; subl $foo@tpoff, %eax
3836 (6 byte form of subl). */
3837 memcpy (contents + rel->r_offset - 2,
3838 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3839 roff = rel->r_offset + 6;
3840 }
3841 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3842 contents + roff);
3843 /* Skip R_386_PC32/R_386_PLT32. */
3844 rel++;
3845 continue;
3846 }
3847 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3848 {
3849 /* GDesc -> LE transition.
3850 It's originally something like:
3851 leal x@tlsdesc(%ebx), %eax
3852
3853 leal x@ntpoff, %eax
3854
3855 Registers other than %eax may be set up here. */
3856
3857 unsigned int val;
3858 bfd_vma roff;
3859
3860 roff = rel->r_offset;
3861 val = bfd_get_8 (input_bfd, contents + roff - 1);
3862
3863 /* Now modify the instruction as appropriate. */
3864 /* aoliva FIXME: remove the above and xor the byte
3865 below with 0x86. */
3866 bfd_put_8 (output_bfd, val ^ 0x86,
3867 contents + roff - 1);
3868 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3869 contents + roff);
3870 continue;
3871 }
3872 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3873 {
3874 /* GDesc -> LE transition.
3875 It's originally:
3876 call *(%eax)
3877 Turn it into:
3878 xchg %ax,%ax */
3879
3880 bfd_vma roff;
3881
3882 roff = rel->r_offset;
3883 bfd_put_8 (output_bfd, 0x66, contents + roff);
3884 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3885 continue;
3886 }
3887 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3888 {
3889 unsigned int val;
3890
3891 /* IE->LE transition:
3892 Originally it can be one of:
3893 movl foo, %eax
3894 movl foo, %reg
3895 addl foo, %reg
3896 We change it into:
3897 movl $foo, %eax
3898 movl $foo, %reg
3899 addl $foo, %reg. */
3900 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3901 if (val == 0xa1)
3902 {
3903 /* movl foo, %eax. */
3904 bfd_put_8 (output_bfd, 0xb8,
3905 contents + rel->r_offset - 1);
3906 }
3907 else
3908 {
3909 unsigned int type;
3910
3911 type = bfd_get_8 (input_bfd,
3912 contents + rel->r_offset - 2);
3913 switch (type)
3914 {
3915 case 0x8b:
3916 /* movl */
3917 bfd_put_8 (output_bfd, 0xc7,
3918 contents + rel->r_offset - 2);
3919 bfd_put_8 (output_bfd,
3920 0xc0 | ((val >> 3) & 7),
3921 contents + rel->r_offset - 1);
3922 break;
3923 case 0x03:
3924 /* addl */
3925 bfd_put_8 (output_bfd, 0x81,
3926 contents + rel->r_offset - 2);
3927 bfd_put_8 (output_bfd,
3928 0xc0 | ((val >> 3) & 7),
3929 contents + rel->r_offset - 1);
3930 break;
3931 default:
3932 BFD_FAIL ();
3933 break;
3934 }
3935 }
3936 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3937 contents + rel->r_offset);
3938 continue;
3939 }
3940 else
3941 {
3942 unsigned int val, type;
3943
3944 /* {IE_32,GOTIE}->LE transition:
3945 Originally it can be one of:
3946 subl foo(%reg1), %reg2
3947 movl foo(%reg1), %reg2
3948 addl foo(%reg1), %reg2
3949 We change it into:
3950 subl $foo, %reg2
3951 movl $foo, %reg2 (6 byte form)
3952 addl $foo, %reg2. */
3953 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3954 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3955 if (type == 0x8b)
3956 {
3957 /* movl */
3958 bfd_put_8 (output_bfd, 0xc7,
3959 contents + rel->r_offset - 2);
3960 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3961 contents + rel->r_offset - 1);
3962 }
3963 else if (type == 0x2b)
3964 {
3965 /* subl */
3966 bfd_put_8 (output_bfd, 0x81,
3967 contents + rel->r_offset - 2);
3968 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3969 contents + rel->r_offset - 1);
3970 }
3971 else if (type == 0x03)
3972 {
3973 /* addl */
3974 bfd_put_8 (output_bfd, 0x81,
3975 contents + rel->r_offset - 2);
3976 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3977 contents + rel->r_offset - 1);
3978 }
3979 else
3980 BFD_FAIL ();
3981 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3982 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3983 contents + rel->r_offset);
3984 else
3985 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3986 contents + rel->r_offset);
3987 continue;
3988 }
3989 }
3990
3991 if (htab->elf.sgot == NULL)
3992 abort ();
3993
3994 if (h != NULL)
3995 {
3996 off = h->got.offset;
3997 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3998 }
3999 else
4000 {
4001 if (local_got_offsets == NULL)
4002 abort ();
4003
4004 off = local_got_offsets[r_symndx];
4005 offplt = local_tlsdesc_gotents[r_symndx];
4006 }
4007
4008 if ((off & 1) != 0)
4009 off &= ~1;
4010 else
4011 {
4012 Elf_Internal_Rela outrel;
4013 int dr_type;
4014 asection *sreloc;
4015
4016 if (htab->elf.srelgot == NULL)
4017 abort ();
4018
4019 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4020
4021 if (GOT_TLS_GDESC_P (tls_type))
4022 {
4023 bfd_byte *loc;
4024 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4025 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4026 <= htab->elf.sgotplt->size);
4027 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4028 + htab->elf.sgotplt->output_offset
4029 + offplt
4030 + htab->sgotplt_jump_table_size);
4031 sreloc = htab->elf.srelplt;
4032 loc = sreloc->contents;
4033 loc += (htab->next_tls_desc_index++
4034 * sizeof (Elf32_External_Rel));
4035 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4036 <= sreloc->contents + sreloc->size);
4037 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4038 if (indx == 0)
4039 {
4040 BFD_ASSERT (! unresolved_reloc);
4041 bfd_put_32 (output_bfd,
4042 relocation - elf_i386_dtpoff_base (info),
4043 htab->elf.sgotplt->contents + offplt
4044 + htab->sgotplt_jump_table_size + 4);
4045 }
4046 else
4047 {
4048 bfd_put_32 (output_bfd, 0,
4049 htab->elf.sgotplt->contents + offplt
4050 + htab->sgotplt_jump_table_size + 4);
4051 }
4052 }
4053
4054 sreloc = htab->elf.srelgot;
4055
4056 outrel.r_offset = (htab->elf.sgot->output_section->vma
4057 + htab->elf.sgot->output_offset + off);
4058
4059 if (GOT_TLS_GD_P (tls_type))
4060 dr_type = R_386_TLS_DTPMOD32;
4061 else if (GOT_TLS_GDESC_P (tls_type))
4062 goto dr_done;
4063 else if (tls_type == GOT_TLS_IE_POS)
4064 dr_type = R_386_TLS_TPOFF;
4065 else
4066 dr_type = R_386_TLS_TPOFF32;
4067
4068 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4069 bfd_put_32 (output_bfd,
4070 relocation - elf_i386_dtpoff_base (info),
4071 htab->elf.sgot->contents + off);
4072 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4073 bfd_put_32 (output_bfd,
4074 elf_i386_dtpoff_base (info) - relocation,
4075 htab->elf.sgot->contents + off);
4076 else if (dr_type != R_386_TLS_DESC)
4077 bfd_put_32 (output_bfd, 0,
4078 htab->elf.sgot->contents + off);
4079 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4080
4081 elf_append_rel (output_bfd, sreloc, &outrel);
4082
4083 if (GOT_TLS_GD_P (tls_type))
4084 {
4085 if (indx == 0)
4086 {
4087 BFD_ASSERT (! unresolved_reloc);
4088 bfd_put_32 (output_bfd,
4089 relocation - elf_i386_dtpoff_base (info),
4090 htab->elf.sgot->contents + off + 4);
4091 }
4092 else
4093 {
4094 bfd_put_32 (output_bfd, 0,
4095 htab->elf.sgot->contents + off + 4);
4096 outrel.r_info = ELF32_R_INFO (indx,
4097 R_386_TLS_DTPOFF32);
4098 outrel.r_offset += 4;
4099 elf_append_rel (output_bfd, sreloc, &outrel);
4100 }
4101 }
4102 else if (tls_type == GOT_TLS_IE_BOTH)
4103 {
4104 bfd_put_32 (output_bfd,
4105 (indx == 0
4106 ? relocation - elf_i386_dtpoff_base (info)
4107 : 0),
4108 htab->elf.sgot->contents + off + 4);
4109 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4110 outrel.r_offset += 4;
4111 elf_append_rel (output_bfd, sreloc, &outrel);
4112 }
4113
4114 dr_done:
4115 if (h != NULL)
4116 h->got.offset |= 1;
4117 else
4118 local_got_offsets[r_symndx] |= 1;
4119 }
4120
4121 if (off >= (bfd_vma) -2
4122 && ! GOT_TLS_GDESC_P (tls_type))
4123 abort ();
4124 if (r_type == R_386_TLS_GOTDESC
4125 || r_type == R_386_TLS_DESC_CALL)
4126 {
4127 relocation = htab->sgotplt_jump_table_size + offplt;
4128 unresolved_reloc = FALSE;
4129 }
4130 else if (r_type == ELF32_R_TYPE (rel->r_info))
4131 {
4132 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4133 + htab->elf.sgotplt->output_offset;
4134 relocation = htab->elf.sgot->output_section->vma
4135 + htab->elf.sgot->output_offset + off - g_o_t;
4136 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4137 && tls_type == GOT_TLS_IE_BOTH)
4138 relocation += 4;
4139 if (r_type == R_386_TLS_IE)
4140 relocation += g_o_t;
4141 unresolved_reloc = FALSE;
4142 }
4143 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4144 {
4145 unsigned int val, type;
4146 bfd_vma roff;
4147
4148 /* GD->IE transition. */
4149 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4150 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4151 if (type == 0x04)
4152 {
4153 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4154 Change it into:
4155 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4156 val >>= 3;
4157 roff = rel->r_offset - 3;
4158 }
4159 else
4160 {
4161 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4162 Change it into:
4163 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4164 roff = rel->r_offset - 2;
4165 }
4166 memcpy (contents + roff,
4167 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4168 contents[roff + 7] = 0x80 | (val & 7);
4169 /* If foo is used only with foo@gotntpoff(%reg) and
4170 foo@indntpoff, but not with foo@gottpoff(%reg), change
4171 subl $foo@gottpoff(%reg), %eax
4172 into:
4173 addl $foo@gotntpoff(%reg), %eax. */
4174 if (tls_type == GOT_TLS_IE_POS)
4175 contents[roff + 6] = 0x03;
4176 bfd_put_32 (output_bfd,
4177 htab->elf.sgot->output_section->vma
4178 + htab->elf.sgot->output_offset + off
4179 - htab->elf.sgotplt->output_section->vma
4180 - htab->elf.sgotplt->output_offset,
4181 contents + roff + 8);
4182 /* Skip R_386_PLT32. */
4183 rel++;
4184 continue;
4185 }
4186 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4187 {
4188 /* GDesc -> IE transition.
4189 It's originally something like:
4190 leal x@tlsdesc(%ebx), %eax
4191
4192 Change it to:
4193 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4194 or:
4195 movl x@gottpoff(%ebx), %eax # before negl %eax
4196
4197 Registers other than %eax may be set up here. */
4198
4199 bfd_vma roff;
4200
4201 /* First, make sure it's a leal adding ebx to a 32-bit
4202 offset into any register, although it's probably
4203 almost always going to be eax. */
4204 roff = rel->r_offset;
4205
4206 /* Now modify the instruction as appropriate. */
4207 /* To turn a leal into a movl in the form we use it, it
4208 suffices to change the first byte from 0x8d to 0x8b.
4209 aoliva FIXME: should we decide to keep the leal, all
4210 we have to do is remove the statement below, and
4211 adjust the relaxation of R_386_TLS_DESC_CALL. */
4212 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4213
4214 if (tls_type == GOT_TLS_IE_BOTH)
4215 off += 4;
4216
4217 bfd_put_32 (output_bfd,
4218 htab->elf.sgot->output_section->vma
4219 + htab->elf.sgot->output_offset + off
4220 - htab->elf.sgotplt->output_section->vma
4221 - htab->elf.sgotplt->output_offset,
4222 contents + roff);
4223 continue;
4224 }
4225 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4226 {
4227 /* GDesc -> IE transition.
4228 It's originally:
4229 call *(%eax)
4230
4231 Change it to:
4232 xchg %ax,%ax
4233 or
4234 negl %eax
4235 depending on how we transformed the TLS_GOTDESC above.
4236 */
4237
4238 bfd_vma roff;
4239
4240 roff = rel->r_offset;
4241
4242 /* Now modify the instruction as appropriate. */
4243 if (tls_type != GOT_TLS_IE_NEG)
4244 {
4245 /* xchg %ax,%ax */
4246 bfd_put_8 (output_bfd, 0x66, contents + roff);
4247 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4248 }
4249 else
4250 {
4251 /* negl %eax */
4252 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4253 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4254 }
4255
4256 continue;
4257 }
4258 else
4259 BFD_ASSERT (FALSE);
4260 break;
4261
4262 case R_386_TLS_LDM:
4263 if (! elf_i386_tls_transition (info, input_bfd,
4264 input_section, contents,
4265 symtab_hdr, sym_hashes,
4266 &r_type, GOT_UNKNOWN, rel,
4267 relend, h, r_symndx))
4268 return FALSE;
4269
4270 if (r_type != R_386_TLS_LDM)
4271 {
4272 /* LD->LE transition:
4273 leal foo(%reg), %eax; call ___tls_get_addr.
4274 We change it into:
4275 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4276 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4277 memcpy (contents + rel->r_offset - 2,
4278 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4279 /* Skip R_386_PC32/R_386_PLT32. */
4280 rel++;
4281 continue;
4282 }
4283
4284 if (htab->elf.sgot == NULL)
4285 abort ();
4286
4287 off = htab->tls_ldm_got.offset;
4288 if (off & 1)
4289 off &= ~1;
4290 else
4291 {
4292 Elf_Internal_Rela outrel;
4293
4294 if (htab->elf.srelgot == NULL)
4295 abort ();
4296
4297 outrel.r_offset = (htab->elf.sgot->output_section->vma
4298 + htab->elf.sgot->output_offset + off);
4299
4300 bfd_put_32 (output_bfd, 0,
4301 htab->elf.sgot->contents + off);
4302 bfd_put_32 (output_bfd, 0,
4303 htab->elf.sgot->contents + off + 4);
4304 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4305 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4306 htab->tls_ldm_got.offset |= 1;
4307 }
4308 relocation = htab->elf.sgot->output_section->vma
4309 + htab->elf.sgot->output_offset + off
4310 - htab->elf.sgotplt->output_section->vma
4311 - htab->elf.sgotplt->output_offset;
4312 unresolved_reloc = FALSE;
4313 break;
4314
4315 case R_386_TLS_LDO_32:
4316 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4317 relocation -= elf_i386_dtpoff_base (info);
4318 else
4319 /* When converting LDO to LE, we must negate. */
4320 relocation = -elf_i386_tpoff (info, relocation);
4321 break;
4322
4323 case R_386_TLS_LE_32:
4324 case R_386_TLS_LE:
4325 if (!info->executable)
4326 {
4327 Elf_Internal_Rela outrel;
4328 asection *sreloc;
4329
4330 outrel.r_offset = rel->r_offset
4331 + input_section->output_section->vma
4332 + input_section->output_offset;
4333 if (h != NULL && h->dynindx != -1)
4334 indx = h->dynindx;
4335 else
4336 indx = 0;
4337 if (r_type == R_386_TLS_LE_32)
4338 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4339 else
4340 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4341 sreloc = elf_section_data (input_section)->sreloc;
4342 if (sreloc == NULL)
4343 abort ();
4344 elf_append_rel (output_bfd, sreloc, &outrel);
4345 if (indx)
4346 continue;
4347 else if (r_type == R_386_TLS_LE_32)
4348 relocation = elf_i386_dtpoff_base (info) - relocation;
4349 else
4350 relocation -= elf_i386_dtpoff_base (info);
4351 }
4352 else if (r_type == R_386_TLS_LE_32)
4353 relocation = elf_i386_tpoff (info, relocation);
4354 else
4355 relocation = -elf_i386_tpoff (info, relocation);
4356 break;
4357
4358 default:
4359 break;
4360 }
4361
4362 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4363 because such sections are not SEC_ALLOC and thus ld.so will
4364 not process them. */
4365 if (unresolved_reloc
4366 && !((input_section->flags & SEC_DEBUGGING) != 0
4367 && h->def_dynamic)
4368 && _bfd_elf_section_offset (output_bfd, info, input_section,
4369 rel->r_offset) != (bfd_vma) -1)
4370 {
4371 (*_bfd_error_handler)
4372 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4373 input_bfd,
4374 input_section,
4375 (long) rel->r_offset,
4376 howto->name,
4377 h->root.root.string);
4378 return FALSE;
4379 }
4380
4381 do_relocation:
4382 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4383 contents, rel->r_offset,
4384 relocation, 0);
4385
4386 check_relocation_error:
4387 if (r != bfd_reloc_ok)
4388 {
4389 const char *name;
4390
4391 if (h != NULL)
4392 name = h->root.root.string;
4393 else
4394 {
4395 name = bfd_elf_string_from_elf_section (input_bfd,
4396 symtab_hdr->sh_link,
4397 sym->st_name);
4398 if (name == NULL)
4399 return FALSE;
4400 if (*name == '\0')
4401 name = bfd_section_name (input_bfd, sec);
4402 }
4403
4404 if (r == bfd_reloc_overflow)
4405 {
4406 if (! ((*info->callbacks->reloc_overflow)
4407 (info, (h ? &h->root : NULL), name, howto->name,
4408 (bfd_vma) 0, input_bfd, input_section,
4409 rel->r_offset)))
4410 return FALSE;
4411 }
4412 else
4413 {
4414 (*_bfd_error_handler)
4415 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4416 input_bfd, input_section,
4417 (long) rel->r_offset, name, (int) r);
4418 return FALSE;
4419 }
4420 }
4421 }
4422
4423 return TRUE;
4424 }
4425
4426 /* Finish up dynamic symbol handling. We set the contents of various
4427 dynamic sections here. */
4428
4429 static bfd_boolean
4430 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4431 struct bfd_link_info *info,
4432 struct elf_link_hash_entry *h,
4433 Elf_Internal_Sym *sym)
4434 {
4435 struct elf_i386_link_hash_table *htab;
4436 unsigned plt_entry_size;
4437 const struct elf_i386_backend_data *abed;
4438
4439 htab = elf_i386_hash_table (info);
4440 if (htab == NULL)
4441 return FALSE;
4442
4443 abed = get_elf_i386_backend_data (output_bfd);
4444 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4445
4446 if (h->plt.offset != (bfd_vma) -1)
4447 {
4448 bfd_vma plt_index;
4449 bfd_vma got_offset;
4450 Elf_Internal_Rela rel;
4451 bfd_byte *loc;
4452 asection *plt, *gotplt, *relplt;
4453
4454 /* When building a static executable, use .iplt, .igot.plt and
4455 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4456 if (htab->elf.splt != NULL)
4457 {
4458 plt = htab->elf.splt;
4459 gotplt = htab->elf.sgotplt;
4460 relplt = htab->elf.srelplt;
4461 }
4462 else
4463 {
4464 plt = htab->elf.iplt;
4465 gotplt = htab->elf.igotplt;
4466 relplt = htab->elf.irelplt;
4467 }
4468
4469 /* This symbol has an entry in the procedure linkage table. Set
4470 it up. */
4471
4472 if ((h->dynindx == -1
4473 && !((h->forced_local || info->executable)
4474 && h->def_regular
4475 && h->type == STT_GNU_IFUNC))
4476 || plt == NULL
4477 || gotplt == NULL
4478 || relplt == NULL)
4479 abort ();
4480
4481 /* Get the index in the procedure linkage table which
4482 corresponds to this symbol. This is the index of this symbol
4483 in all the symbols for which we are making plt entries. The
4484 first entry in the procedure linkage table is reserved.
4485
4486 Get the offset into the .got table of the entry that
4487 corresponds to this function. Each .got entry is 4 bytes.
4488 The first three are reserved.
4489
4490 For static executables, we don't reserve anything. */
4491
4492 if (plt == htab->elf.splt)
4493 {
4494 got_offset = h->plt.offset / plt_entry_size - 1;
4495 got_offset = (got_offset + 3) * 4;
4496 }
4497 else
4498 {
4499 got_offset = h->plt.offset / plt_entry_size;
4500 got_offset = got_offset * 4;
4501 }
4502
4503 /* Fill in the entry in the procedure linkage table. */
4504 if (! info->shared)
4505 {
4506 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4507 abed->plt->plt_entry_size);
4508 bfd_put_32 (output_bfd,
4509 (gotplt->output_section->vma
4510 + gotplt->output_offset
4511 + got_offset),
4512 plt->contents + h->plt.offset
4513 + abed->plt->plt_got_offset);
4514
4515 if (abed->is_vxworks)
4516 {
4517 int s, k, reloc_index;
4518
4519 /* Create the R_386_32 relocation referencing the GOT
4520 for this PLT entry. */
4521
4522 /* S: Current slot number (zero-based). */
4523 s = ((h->plt.offset - abed->plt->plt_entry_size)
4524 / abed->plt->plt_entry_size);
4525 /* K: Number of relocations for PLTResolve. */
4526 if (info->shared)
4527 k = PLTRESOLVE_RELOCS_SHLIB;
4528 else
4529 k = PLTRESOLVE_RELOCS;
4530 /* Skip the PLTresolve relocations, and the relocations for
4531 the other PLT slots. */
4532 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4533 loc = (htab->srelplt2->contents + reloc_index
4534 * sizeof (Elf32_External_Rel));
4535
4536 rel.r_offset = (htab->elf.splt->output_section->vma
4537 + htab->elf.splt->output_offset
4538 + h->plt.offset + 2),
4539 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4540 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4541
4542 /* Create the R_386_32 relocation referencing the beginning of
4543 the PLT for this GOT entry. */
4544 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4545 + htab->elf.sgotplt->output_offset
4546 + got_offset);
4547 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4548 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4549 loc + sizeof (Elf32_External_Rel));
4550 }
4551 }
4552 else
4553 {
4554 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4555 abed->plt->plt_entry_size);
4556 bfd_put_32 (output_bfd, got_offset,
4557 plt->contents + h->plt.offset
4558 + abed->plt->plt_got_offset);
4559 }
4560
4561 /* Fill in the entry in the global offset table. */
4562 bfd_put_32 (output_bfd,
4563 (plt->output_section->vma
4564 + plt->output_offset
4565 + h->plt.offset
4566 + abed->plt->plt_lazy_offset),
4567 gotplt->contents + got_offset);
4568
4569 /* Fill in the entry in the .rel.plt section. */
4570 rel.r_offset = (gotplt->output_section->vma
4571 + gotplt->output_offset
4572 + got_offset);
4573 if (h->dynindx == -1
4574 || ((info->executable
4575 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4576 && h->def_regular
4577 && h->type == STT_GNU_IFUNC))
4578 {
4579 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4580 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4581 in the .got.plt section. */
4582 bfd_put_32 (output_bfd,
4583 (h->root.u.def.value
4584 + h->root.u.def.section->output_section->vma
4585 + h->root.u.def.section->output_offset),
4586 gotplt->contents + got_offset);
4587 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4588 /* R_386_IRELATIVE comes last. */
4589 plt_index = htab->next_irelative_index--;
4590 }
4591 else
4592 {
4593 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4594 plt_index = htab->next_jump_slot_index++;
4595 }
4596 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4597 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4598
4599 /* Don't fill PLT entry for static executables. */
4600 if (plt == htab->elf.splt)
4601 {
4602 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4603 plt->contents + h->plt.offset
4604 + abed->plt->plt_reloc_offset);
4605 bfd_put_32 (output_bfd, - (h->plt.offset
4606 + abed->plt->plt_plt_offset + 4),
4607 plt->contents + h->plt.offset
4608 + abed->plt->plt_plt_offset);
4609 }
4610
4611 if (!h->def_regular)
4612 {
4613 /* Mark the symbol as undefined, rather than as defined in
4614 the .plt section. Leave the value if there were any
4615 relocations where pointer equality matters (this is a clue
4616 for the dynamic linker, to make function pointer
4617 comparisons work between an application and shared
4618 library), otherwise set it to zero. If a function is only
4619 called from a binary, there is no need to slow down
4620 shared libraries because of that. */
4621 sym->st_shndx = SHN_UNDEF;
4622 if (!h->pointer_equality_needed)
4623 sym->st_value = 0;
4624 }
4625 }
4626
4627 if (h->got.offset != (bfd_vma) -1
4628 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4629 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4630 {
4631 Elf_Internal_Rela rel;
4632
4633 /* This symbol has an entry in the global offset table. Set it
4634 up. */
4635
4636 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4637 abort ();
4638
4639 rel.r_offset = (htab->elf.sgot->output_section->vma
4640 + htab->elf.sgot->output_offset
4641 + (h->got.offset & ~(bfd_vma) 1));
4642
4643 /* If this is a static link, or it is a -Bsymbolic link and the
4644 symbol is defined locally or was forced to be local because
4645 of a version file, we just want to emit a RELATIVE reloc.
4646 The entry in the global offset table will already have been
4647 initialized in the relocate_section function. */
4648 if (h->def_regular
4649 && h->type == STT_GNU_IFUNC)
4650 {
4651 if (info->shared)
4652 {
4653 /* Generate R_386_GLOB_DAT. */
4654 goto do_glob_dat;
4655 }
4656 else
4657 {
4658 asection *plt;
4659
4660 if (!h->pointer_equality_needed)
4661 abort ();
4662
4663 /* For non-shared object, we can't use .got.plt, which
4664 contains the real function addres if we need pointer
4665 equality. We load the GOT entry with the PLT entry. */
4666 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4667 bfd_put_32 (output_bfd,
4668 (plt->output_section->vma
4669 + plt->output_offset + h->plt.offset),
4670 htab->elf.sgot->contents + h->got.offset);
4671 return TRUE;
4672 }
4673 }
4674 else if (info->shared
4675 && SYMBOL_REFERENCES_LOCAL (info, h))
4676 {
4677 BFD_ASSERT((h->got.offset & 1) != 0);
4678 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4679 }
4680 else
4681 {
4682 BFD_ASSERT((h->got.offset & 1) == 0);
4683 do_glob_dat:
4684 bfd_put_32 (output_bfd, (bfd_vma) 0,
4685 htab->elf.sgot->contents + h->got.offset);
4686 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4687 }
4688
4689 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4690 }
4691
4692 if (h->needs_copy)
4693 {
4694 Elf_Internal_Rela rel;
4695
4696 /* This symbol needs a copy reloc. Set it up. */
4697
4698 if (h->dynindx == -1
4699 || (h->root.type != bfd_link_hash_defined
4700 && h->root.type != bfd_link_hash_defweak)
4701 || htab->srelbss == NULL)
4702 abort ();
4703
4704 rel.r_offset = (h->root.u.def.value
4705 + h->root.u.def.section->output_section->vma
4706 + h->root.u.def.section->output_offset);
4707 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4708 elf_append_rel (output_bfd, htab->srelbss, &rel);
4709 }
4710
4711 return TRUE;
4712 }
4713
4714 /* Finish up local dynamic symbol handling. We set the contents of
4715 various dynamic sections here. */
4716
4717 static bfd_boolean
4718 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4719 {
4720 struct elf_link_hash_entry *h
4721 = (struct elf_link_hash_entry *) *slot;
4722 struct bfd_link_info *info
4723 = (struct bfd_link_info *) inf;
4724
4725 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4726 h, NULL);
4727 }
4728
4729 /* Used to decide how to sort relocs in an optimal manner for the
4730 dynamic linker, before writing them out. */
4731
4732 static enum elf_reloc_type_class
4733 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4734 {
4735 switch (ELF32_R_TYPE (rela->r_info))
4736 {
4737 case R_386_RELATIVE:
4738 return reloc_class_relative;
4739 case R_386_JUMP_SLOT:
4740 return reloc_class_plt;
4741 case R_386_COPY:
4742 return reloc_class_copy;
4743 default:
4744 return reloc_class_normal;
4745 }
4746 }
4747
4748 /* Finish up the dynamic sections. */
4749
4750 static bfd_boolean
4751 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4752 struct bfd_link_info *info)
4753 {
4754 struct elf_i386_link_hash_table *htab;
4755 bfd *dynobj;
4756 asection *sdyn;
4757 const struct elf_i386_backend_data *abed;
4758
4759 htab = elf_i386_hash_table (info);
4760 if (htab == NULL)
4761 return FALSE;
4762
4763 dynobj = htab->elf.dynobj;
4764 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4765 abed = get_elf_i386_backend_data (output_bfd);
4766
4767 if (htab->elf.dynamic_sections_created)
4768 {
4769 Elf32_External_Dyn *dyncon, *dynconend;
4770
4771 if (sdyn == NULL || htab->elf.sgot == NULL)
4772 abort ();
4773
4774 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4775 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4776 for (; dyncon < dynconend; dyncon++)
4777 {
4778 Elf_Internal_Dyn dyn;
4779 asection *s;
4780
4781 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4782
4783 switch (dyn.d_tag)
4784 {
4785 default:
4786 if (abed->is_vxworks
4787 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4788 break;
4789 continue;
4790
4791 case DT_PLTGOT:
4792 s = htab->elf.sgotplt;
4793 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4794 break;
4795
4796 case DT_JMPREL:
4797 s = htab->elf.srelplt;
4798 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4799 break;
4800
4801 case DT_PLTRELSZ:
4802 s = htab->elf.srelplt;
4803 dyn.d_un.d_val = s->size;
4804 break;
4805
4806 case DT_RELSZ:
4807 /* My reading of the SVR4 ABI indicates that the
4808 procedure linkage table relocs (DT_JMPREL) should be
4809 included in the overall relocs (DT_REL). This is
4810 what Solaris does. However, UnixWare can not handle
4811 that case. Therefore, we override the DT_RELSZ entry
4812 here to make it not include the JMPREL relocs. */
4813 s = htab->elf.srelplt;
4814 if (s == NULL)
4815 continue;
4816 dyn.d_un.d_val -= s->size;
4817 break;
4818
4819 case DT_REL:
4820 /* We may not be using the standard ELF linker script.
4821 If .rel.plt is the first .rel section, we adjust
4822 DT_REL to not include it. */
4823 s = htab->elf.srelplt;
4824 if (s == NULL)
4825 continue;
4826 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4827 continue;
4828 dyn.d_un.d_ptr += s->size;
4829 break;
4830 }
4831
4832 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4833 }
4834
4835 /* Fill in the first entry in the procedure linkage table. */
4836 if (htab->elf.splt && htab->elf.splt->size > 0)
4837 {
4838 if (info->shared)
4839 {
4840 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4841 abed->plt->plt0_entry_size);
4842 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4843 abed->plt0_pad_byte,
4844 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4845 }
4846 else
4847 {
4848 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4849 abed->plt->plt0_entry_size);
4850 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4851 abed->plt0_pad_byte,
4852 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4853 bfd_put_32 (output_bfd,
4854 (htab->elf.sgotplt->output_section->vma
4855 + htab->elf.sgotplt->output_offset
4856 + 4),
4857 htab->elf.splt->contents
4858 + abed->plt->plt0_got1_offset);
4859 bfd_put_32 (output_bfd,
4860 (htab->elf.sgotplt->output_section->vma
4861 + htab->elf.sgotplt->output_offset
4862 + 8),
4863 htab->elf.splt->contents
4864 + abed->plt->plt0_got2_offset);
4865
4866 if (abed->is_vxworks)
4867 {
4868 Elf_Internal_Rela rel;
4869
4870 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4871 On IA32 we use REL relocations so the addend goes in
4872 the PLT directly. */
4873 rel.r_offset = (htab->elf.splt->output_section->vma
4874 + htab->elf.splt->output_offset
4875 + abed->plt->plt0_got1_offset);
4876 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4877 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4878 htab->srelplt2->contents);
4879 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4880 rel.r_offset = (htab->elf.splt->output_section->vma
4881 + htab->elf.splt->output_offset
4882 + abed->plt->plt0_got2_offset);
4883 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4884 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4885 htab->srelplt2->contents +
4886 sizeof (Elf32_External_Rel));
4887 }
4888 }
4889
4890 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4891 really seem like the right value. */
4892 elf_section_data (htab->elf.splt->output_section)
4893 ->this_hdr.sh_entsize = 4;
4894
4895 /* Correct the .rel.plt.unloaded relocations. */
4896 if (abed->is_vxworks && !info->shared)
4897 {
4898 int num_plts = (htab->elf.splt->size
4899 / abed->plt->plt_entry_size) - 1;
4900 unsigned char *p;
4901
4902 p = htab->srelplt2->contents;
4903 if (info->shared)
4904 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4905 else
4906 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4907
4908 for (; num_plts; num_plts--)
4909 {
4910 Elf_Internal_Rela rel;
4911 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4912 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4913 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4914 p += sizeof (Elf32_External_Rel);
4915
4916 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4917 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4918 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4919 p += sizeof (Elf32_External_Rel);
4920 }
4921 }
4922 }
4923 }
4924
4925 if (htab->elf.sgotplt)
4926 {
4927 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4928 {
4929 (*_bfd_error_handler)
4930 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4931 return FALSE;
4932 }
4933
4934 /* Fill in the first three entries in the global offset table. */
4935 if (htab->elf.sgotplt->size > 0)
4936 {
4937 bfd_put_32 (output_bfd,
4938 (sdyn == NULL ? 0
4939 : sdyn->output_section->vma + sdyn->output_offset),
4940 htab->elf.sgotplt->contents);
4941 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4942 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4943 }
4944
4945 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4946 }
4947
4948 /* Adjust .eh_frame for .plt section. */
4949 if (htab->plt_eh_frame != NULL
4950 && htab->plt_eh_frame->contents != NULL)
4951 {
4952 if (htab->elf.splt != NULL
4953 && htab->elf.splt->size != 0
4954 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4955 && htab->elf.splt->output_section != NULL
4956 && htab->plt_eh_frame->output_section != NULL)
4957 {
4958 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4959 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4960 + htab->plt_eh_frame->output_offset
4961 + PLT_FDE_START_OFFSET;
4962 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4963 htab->plt_eh_frame->contents
4964 + PLT_FDE_START_OFFSET);
4965 }
4966 if (htab->plt_eh_frame->sec_info_type
4967 == SEC_INFO_TYPE_EH_FRAME)
4968 {
4969 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4970 htab->plt_eh_frame,
4971 htab->plt_eh_frame->contents))
4972 return FALSE;
4973 }
4974 }
4975
4976 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4977 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4978
4979 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4980 htab_traverse (htab->loc_hash_table,
4981 elf_i386_finish_local_dynamic_symbol,
4982 info);
4983
4984 return TRUE;
4985 }
4986
4987 /* Return address for Ith PLT stub in section PLT, for relocation REL
4988 or (bfd_vma) -1 if it should not be included. */
4989
4990 static bfd_vma
4991 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4992 const arelent *rel ATTRIBUTE_UNUSED)
4993 {
4994 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4995 }
4996
4997 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4998
4999 static bfd_boolean
5000 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5001 {
5002 if (h->plt.offset != (bfd_vma) -1
5003 && !h->def_regular
5004 && !h->pointer_equality_needed)
5005 return FALSE;
5006
5007 return _bfd_elf_hash_symbol (h);
5008 }
5009
5010 /* Hook called by the linker routine which adds symbols from an object
5011 file. */
5012
5013 static bfd_boolean
5014 elf_i386_add_symbol_hook (bfd * abfd,
5015 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5016 Elf_Internal_Sym * sym,
5017 const char ** namep ATTRIBUTE_UNUSED,
5018 flagword * flagsp ATTRIBUTE_UNUSED,
5019 asection ** secp ATTRIBUTE_UNUSED,
5020 bfd_vma * valp ATTRIBUTE_UNUSED)
5021 {
5022 if ((abfd->flags & DYNAMIC) == 0
5023 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5024 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5025 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5026
5027 return TRUE;
5028 }
5029
5030 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5031 #define TARGET_LITTLE_NAME "elf32-i386"
5032 #define ELF_ARCH bfd_arch_i386
5033 #define ELF_TARGET_ID I386_ELF_DATA
5034 #define ELF_MACHINE_CODE EM_386
5035 #define ELF_MAXPAGESIZE 0x1000
5036
5037 #define elf_backend_can_gc_sections 1
5038 #define elf_backend_can_refcount 1
5039 #define elf_backend_want_got_plt 1
5040 #define elf_backend_plt_readonly 1
5041 #define elf_backend_want_plt_sym 0
5042 #define elf_backend_got_header_size 12
5043 #define elf_backend_plt_alignment 4
5044
5045 /* Support RELA for objdump of prelink objects. */
5046 #define elf_info_to_howto elf_i386_info_to_howto_rel
5047 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5048
5049 #define bfd_elf32_mkobject elf_i386_mkobject
5050
5051 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5052 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5053 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5054 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5055 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5056
5057 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5058 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5059 #define elf_backend_check_relocs elf_i386_check_relocs
5060 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5061 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5062 #define elf_backend_fake_sections elf_i386_fake_sections
5063 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5064 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5065 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5066 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5067 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5068 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5069 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5070 #define elf_backend_relocate_section elf_i386_relocate_section
5071 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5072 #define elf_backend_always_size_sections elf_i386_always_size_sections
5073 #define elf_backend_omit_section_dynsym \
5074 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5075 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5076 #define elf_backend_hash_symbol elf_i386_hash_symbol
5077 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5078 #undef elf_backend_post_process_headers
5079 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5080
5081 #include "elf32-target.h"
5082
5083 /* FreeBSD support. */
5084
5085 #undef TARGET_LITTLE_SYM
5086 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5087 #undef TARGET_LITTLE_NAME
5088 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5089 #undef ELF_OSABI
5090 #define ELF_OSABI ELFOSABI_FREEBSD
5091
5092 /* The kernel recognizes executables as valid only if they carry a
5093 "FreeBSD" label in the ELF header. So we put this label on all
5094 executables and (for simplicity) also all other object files. */
5095
5096 static void
5097 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5098 {
5099 _bfd_elf_set_osabi (abfd, info);
5100
5101 #ifdef OLD_FREEBSD_ABI_LABEL
5102 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5103 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5104 #endif
5105 }
5106
5107 #undef elf_backend_post_process_headers
5108 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5109 #undef elf32_bed
5110 #define elf32_bed elf32_i386_fbsd_bed
5111
5112 #undef elf_backend_add_symbol_hook
5113
5114 #include "elf32-target.h"
5115
5116 /* Solaris 2. */
5117
5118 #undef TARGET_LITTLE_SYM
5119 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5120 #undef TARGET_LITTLE_NAME
5121 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5122
5123 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5124 objects won't be recognized. */
5125 #undef ELF_OSABI
5126
5127 #undef elf32_bed
5128 #define elf32_bed elf32_i386_sol2_bed
5129
5130 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5131 boundary. */
5132 #undef elf_backend_static_tls_alignment
5133 #define elf_backend_static_tls_alignment 8
5134
5135 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5136
5137 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5138 File, p.63. */
5139 #undef elf_backend_want_plt_sym
5140 #define elf_backend_want_plt_sym 1
5141
5142 #include "elf32-target.h"
5143
5144 /* Native Client support. */
5145
5146 #undef TARGET_LITTLE_SYM
5147 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5148 #undef TARGET_LITTLE_NAME
5149 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5150 #undef elf32_bed
5151 #define elf32_bed elf32_i386_nacl_bed
5152
5153 #undef ELF_MAXPAGESIZE
5154 #define ELF_MAXPAGESIZE 0x10000
5155
5156 /* Restore defaults. */
5157 #undef ELF_OSABI
5158 #undef elf_backend_want_plt_sym
5159 #define elf_backend_want_plt_sym 0
5160 #undef elf_backend_post_process_headers
5161 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5162 #undef elf_backend_static_tls_alignment
5163
5164 /* NaCl uses substantially different PLT entries for the same effects. */
5165
5166 #undef elf_backend_plt_alignment
5167 #define elf_backend_plt_alignment 5
5168 #define NACL_PLT_ENTRY_SIZE 64
5169 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5170
5171 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5172 {
5173 0xff, 0x35, /* pushl contents of address */
5174 0, 0, 0, 0, /* replaced with address of .got + 4. */
5175 0x8b, 0x0d, /* movl contents of address, %ecx */
5176 0, 0, 0, 0, /* replaced with address of .got + 8. */
5177 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5178 0xff, 0xe1 /* jmp *%ecx */
5179 };
5180
5181 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5182 {
5183 0x8b, 0x0d, /* movl contents of address, %ecx */
5184 0, 0, 0, 0, /* replaced with GOT slot address. */
5185 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5186 0xff, 0xe1, /* jmp *%ecx */
5187
5188 /* Pad to the next 32-byte boundary with nop instructions. */
5189 0x90,
5190 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5191 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5192
5193 /* Lazy GOT entries point here (32-byte aligned). */
5194 0x68, /* pushl immediate */
5195 0, 0, 0, 0, /* replaced with reloc offset. */
5196 0xe9, /* jmp relative */
5197 0, 0, 0, 0, /* replaced with offset to .plt. */
5198
5199 /* Pad to the next 32-byte boundary with nop instructions. */
5200 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5201 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5202 0x90, 0x90
5203 };
5204
5205 static const bfd_byte
5206 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5207 {
5208 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5209 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5210 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5211 0xff, 0xe1, /* jmp *%ecx */
5212
5213 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5214 so pad to that size with nop instructions. */
5215 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5216 };
5217
5218 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5219 {
5220 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5221 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5222 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5223 0xff, 0xe1, /* jmp *%ecx */
5224
5225 /* Pad to the next 32-byte boundary with nop instructions. */
5226 0x90,
5227 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5228 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5229
5230 /* Lazy GOT entries point here (32-byte aligned). */
5231 0x68, /* pushl immediate */
5232 0, 0, 0, 0, /* replaced with offset into relocation table. */
5233 0xe9, /* jmp relative */
5234 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5235
5236 /* Pad to the next 32-byte boundary with nop instructions. */
5237 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5238 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5239 0x90, 0x90
5240 };
5241
5242 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5243 {
5244 #if (PLT_CIE_LENGTH != 20 \
5245 || PLT_FDE_LENGTH != 36 \
5246 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5247 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5248 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5249 #endif
5250 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5251 0, 0, 0, 0, /* CIE ID */
5252 1, /* CIE version */
5253 'z', 'R', 0, /* Augmentation string */
5254 1, /* Code alignment factor */
5255 0x7c, /* Data alignment factor: -4 */
5256 8, /* Return address column */
5257 1, /* Augmentation size */
5258 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5259 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5260 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5261 DW_CFA_nop, DW_CFA_nop,
5262
5263 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5264 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5265 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5266 0, 0, 0, 0, /* .plt size goes here */
5267 0, /* Augmentation size */
5268 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5269 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5270 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5271 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5272 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5273 13, /* Block length */
5274 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5275 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5276 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5277 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5278 DW_CFA_nop, DW_CFA_nop
5279 };
5280
5281 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5282 {
5283 elf_i386_nacl_plt0_entry, /* plt0_entry */
5284 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5285 2, /* plt0_got1_offset */
5286 8, /* plt0_got2_offset */
5287 elf_i386_nacl_plt_entry, /* plt_entry */
5288 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5289 2, /* plt_got_offset */
5290 33, /* plt_reloc_offset */
5291 38, /* plt_plt_offset */
5292 32, /* plt_lazy_offset */
5293 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5294 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5295 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5296 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5297 };
5298
5299 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5300 {
5301 &elf_i386_nacl_plt, /* plt */
5302 0x90, /* plt0_pad_byte: nop insn */
5303 0, /* is_vxworks */
5304 };
5305
5306 #undef elf_backend_arch_data
5307 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5308
5309 #undef elf_backend_modify_segment_map
5310 #define elf_backend_modify_segment_map nacl_modify_segment_map
5311 #undef elf_backend_modify_program_headers
5312 #define elf_backend_modify_program_headers nacl_modify_program_headers
5313
5314 #include "elf32-target.h"
5315
5316 /* Restore defaults. */
5317 #undef elf_backend_modify_segment_map
5318 #undef elf_backend_modify_program_headers
5319
5320 /* VxWorks support. */
5321
5322 #undef TARGET_LITTLE_SYM
5323 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5324 #undef TARGET_LITTLE_NAME
5325 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5326 #undef ELF_OSABI
5327 #undef elf_backend_plt_alignment
5328 #define elf_backend_plt_alignment 4
5329
5330 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5331 {
5332 &elf_i386_plt, /* plt */
5333 0x90, /* plt0_pad_byte */
5334 1, /* is_vxworks */
5335 };
5336
5337 #undef elf_backend_arch_data
5338 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5339
5340 #undef elf_backend_relocs_compatible
5341 #undef elf_backend_post_process_headers
5342 #undef elf_backend_add_symbol_hook
5343 #define elf_backend_add_symbol_hook \
5344 elf_vxworks_add_symbol_hook
5345 #undef elf_backend_link_output_symbol_hook
5346 #define elf_backend_link_output_symbol_hook \
5347 elf_vxworks_link_output_symbol_hook
5348 #undef elf_backend_emit_relocs
5349 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5350 #undef elf_backend_final_write_processing
5351 #define elf_backend_final_write_processing \
5352 elf_vxworks_final_write_processing
5353 #undef elf_backend_static_tls_alignment
5354
5355 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5356 define it. */
5357 #undef elf_backend_want_plt_sym
5358 #define elf_backend_want_plt_sym 1
5359
5360 #undef elf32_bed
5361 #define elf32_bed elf32_i386_vxworks_bed
5362
5363 #include "elf32-target.h"
GDB Binutils - Deliverables
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