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Don't update reloc count if there are any non pc-relative relocs
[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, 2013
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_zmalloc (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->loc_hash_table = htab_try_create (1024,
954 elf_i386_local_htab_hash,
955 elf_i386_local_htab_eq,
956 NULL);
957 ret->loc_hash_memory = objalloc_create ();
958 if (!ret->loc_hash_table || !ret->loc_hash_memory)
959 {
960 free (ret);
961 return NULL;
962 }
963
964 return &ret->elf.root;
965 }
966
967 /* Destroy an i386 ELF linker hash table. */
968
969 static void
970 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
971 {
972 struct elf_i386_link_hash_table *htab
973 = (struct elf_i386_link_hash_table *) hash;
974
975 if (htab->loc_hash_table)
976 htab_delete (htab->loc_hash_table);
977 if (htab->loc_hash_memory)
978 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
979 _bfd_elf_link_hash_table_free (hash);
980 }
981
982 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
983 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
984 hash table. */
985
986 static bfd_boolean
987 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
988 {
989 struct elf_i386_link_hash_table *htab;
990
991 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
992 return FALSE;
993
994 htab = elf_i386_hash_table (info);
995 if (htab == NULL)
996 return FALSE;
997
998 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
999 if (!info->shared)
1000 htab->srelbss = bfd_get_linker_section (dynobj, ".rel.bss");
1001
1002 if (!htab->sdynbss
1003 || (!info->shared && !htab->srelbss))
1004 abort ();
1005
1006 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1007 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1008 &htab->srelplt2))
1009 return FALSE;
1010
1011 if (!info->no_ld_generated_unwind_info
1012 && htab->plt_eh_frame == NULL
1013 && htab->elf.splt != NULL)
1014 {
1015 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1016 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1017 | SEC_LINKER_CREATED);
1018 htab->plt_eh_frame
1019 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1020 if (htab->plt_eh_frame == NULL
1021 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1022 return FALSE;
1023 }
1024
1025 return TRUE;
1026 }
1027
1028 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1029
1030 static void
1031 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1032 struct elf_link_hash_entry *dir,
1033 struct elf_link_hash_entry *ind)
1034 {
1035 struct elf_i386_link_hash_entry *edir, *eind;
1036
1037 edir = (struct elf_i386_link_hash_entry *) dir;
1038 eind = (struct elf_i386_link_hash_entry *) ind;
1039
1040 if (eind->dyn_relocs != NULL)
1041 {
1042 if (edir->dyn_relocs != NULL)
1043 {
1044 struct elf_dyn_relocs **pp;
1045 struct elf_dyn_relocs *p;
1046
1047 /* Add reloc counts against the indirect sym to the direct sym
1048 list. Merge any entries against the same section. */
1049 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1050 {
1051 struct elf_dyn_relocs *q;
1052
1053 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1054 if (q->sec == p->sec)
1055 {
1056 q->pc_count += p->pc_count;
1057 q->count += p->count;
1058 *pp = p->next;
1059 break;
1060 }
1061 if (q == NULL)
1062 pp = &p->next;
1063 }
1064 *pp = edir->dyn_relocs;
1065 }
1066
1067 edir->dyn_relocs = eind->dyn_relocs;
1068 eind->dyn_relocs = NULL;
1069 }
1070
1071 if (ind->root.type == bfd_link_hash_indirect
1072 && dir->got.refcount <= 0)
1073 {
1074 edir->tls_type = eind->tls_type;
1075 eind->tls_type = GOT_UNKNOWN;
1076 }
1077
1078 if (ELIMINATE_COPY_RELOCS
1079 && ind->root.type != bfd_link_hash_indirect
1080 && dir->dynamic_adjusted)
1081 {
1082 /* If called to transfer flags for a weakdef during processing
1083 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1084 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1085 dir->ref_dynamic |= ind->ref_dynamic;
1086 dir->ref_regular |= ind->ref_regular;
1087 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1088 dir->needs_plt |= ind->needs_plt;
1089 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1090 }
1091 else
1092 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1093 }
1094
1095 /* Return TRUE if the TLS access code sequence support transition
1096 from R_TYPE. */
1097
1098 static bfd_boolean
1099 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1100 bfd_byte *contents,
1101 Elf_Internal_Shdr *symtab_hdr,
1102 struct elf_link_hash_entry **sym_hashes,
1103 unsigned int r_type,
1104 const Elf_Internal_Rela *rel,
1105 const Elf_Internal_Rela *relend)
1106 {
1107 unsigned int val, type;
1108 unsigned long r_symndx;
1109 struct elf_link_hash_entry *h;
1110 bfd_vma offset;
1111
1112 /* Get the section contents. */
1113 if (contents == NULL)
1114 {
1115 if (elf_section_data (sec)->this_hdr.contents != NULL)
1116 contents = elf_section_data (sec)->this_hdr.contents;
1117 else
1118 {
1119 /* FIXME: How to better handle error condition? */
1120 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1121 return FALSE;
1122
1123 /* Cache the section contents for elf_link_input_bfd. */
1124 elf_section_data (sec)->this_hdr.contents = contents;
1125 }
1126 }
1127
1128 offset = rel->r_offset;
1129 switch (r_type)
1130 {
1131 case R_386_TLS_GD:
1132 case R_386_TLS_LDM:
1133 if (offset < 2 || (rel + 1) >= relend)
1134 return FALSE;
1135
1136 type = bfd_get_8 (abfd, contents + offset - 2);
1137 if (r_type == R_386_TLS_GD)
1138 {
1139 /* Check transition from GD access model. Only
1140 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1141 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1142 can transit to different access model. */
1143 if ((offset + 10) > sec->size ||
1144 (type != 0x8d && type != 0x04))
1145 return FALSE;
1146
1147 val = bfd_get_8 (abfd, contents + offset - 1);
1148 if (type == 0x04)
1149 {
1150 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1151 if (offset < 3)
1152 return FALSE;
1153
1154 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1155 return FALSE;
1156
1157 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1158 return FALSE;
1159 }
1160 else
1161 {
1162 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1163 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1164 return FALSE;
1165
1166 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1167 return FALSE;
1168 }
1169 }
1170 else
1171 {
1172 /* Check transition from LD access model. Only
1173 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1174 can transit to different access model. */
1175 if (type != 0x8d || (offset + 9) > sec->size)
1176 return FALSE;
1177
1178 val = bfd_get_8 (abfd, contents + offset - 1);
1179 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1180 return FALSE;
1181 }
1182
1183 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1184 return FALSE;
1185
1186 r_symndx = ELF32_R_SYM (rel[1].r_info);
1187 if (r_symndx < symtab_hdr->sh_info)
1188 return FALSE;
1189
1190 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1191 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1192 may be versioned. */
1193 return (h != NULL
1194 && h->root.root.string != NULL
1195 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1196 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1197 && (strncmp (h->root.root.string, "___tls_get_addr",
1198 15) == 0));
1199
1200 case R_386_TLS_IE:
1201 /* Check transition from IE access model:
1202 movl foo@indntpoff(%rip), %eax
1203 movl foo@indntpoff(%rip), %reg
1204 addl foo@indntpoff(%rip), %reg
1205 */
1206
1207 if (offset < 1 || (offset + 4) > sec->size)
1208 return FALSE;
1209
1210 /* Check "movl foo@tpoff(%rip), %eax" first. */
1211 val = bfd_get_8 (abfd, contents + offset - 1);
1212 if (val == 0xa1)
1213 return TRUE;
1214
1215 if (offset < 2)
1216 return FALSE;
1217
1218 /* Check movl|addl foo@tpoff(%rip), %reg. */
1219 type = bfd_get_8 (abfd, contents + offset - 2);
1220 return ((type == 0x8b || type == 0x03)
1221 && (val & 0xc7) == 0x05);
1222
1223 case R_386_TLS_GOTIE:
1224 case R_386_TLS_IE_32:
1225 /* Check transition from {IE_32,GOTIE} access model:
1226 subl foo@{tpoff,gontoff}(%reg1), %reg2
1227 movl foo@{tpoff,gontoff}(%reg1), %reg2
1228 addl foo@{tpoff,gontoff}(%reg1), %reg2
1229 */
1230
1231 if (offset < 2 || (offset + 4) > sec->size)
1232 return FALSE;
1233
1234 val = bfd_get_8 (abfd, contents + offset - 1);
1235 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1236 return FALSE;
1237
1238 type = bfd_get_8 (abfd, contents + offset - 2);
1239 return type == 0x8b || type == 0x2b || type == 0x03;
1240
1241 case R_386_TLS_GOTDESC:
1242 /* Check transition from GDesc access model:
1243 leal x@tlsdesc(%ebx), %eax
1244
1245 Make sure it's a leal adding ebx to a 32-bit offset
1246 into any register, although it's probably almost always
1247 going to be eax. */
1248
1249 if (offset < 2 || (offset + 4) > sec->size)
1250 return FALSE;
1251
1252 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1253 return FALSE;
1254
1255 val = bfd_get_8 (abfd, contents + offset - 1);
1256 return (val & 0xc7) == 0x83;
1257
1258 case R_386_TLS_DESC_CALL:
1259 /* Check transition from GDesc access model:
1260 call *x@tlsdesc(%rax)
1261 */
1262 if (offset + 2 <= sec->size)
1263 {
1264 /* Make sure that it's a call *x@tlsdesc(%rax). */
1265 static const unsigned char call[] = { 0xff, 0x10 };
1266 return memcmp (contents + offset, call, 2) == 0;
1267 }
1268
1269 return FALSE;
1270
1271 default:
1272 abort ();
1273 }
1274 }
1275
1276 /* Return TRUE if the TLS access transition is OK or no transition
1277 will be performed. Update R_TYPE if there is a transition. */
1278
1279 static bfd_boolean
1280 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1281 asection *sec, bfd_byte *contents,
1282 Elf_Internal_Shdr *symtab_hdr,
1283 struct elf_link_hash_entry **sym_hashes,
1284 unsigned int *r_type, int tls_type,
1285 const Elf_Internal_Rela *rel,
1286 const Elf_Internal_Rela *relend,
1287 struct elf_link_hash_entry *h,
1288 unsigned long r_symndx)
1289 {
1290 unsigned int from_type = *r_type;
1291 unsigned int to_type = from_type;
1292 bfd_boolean check = TRUE;
1293
1294 /* Skip TLS transition for functions. */
1295 if (h != NULL
1296 && (h->type == STT_FUNC
1297 || h->type == STT_GNU_IFUNC))
1298 return TRUE;
1299
1300 switch (from_type)
1301 {
1302 case R_386_TLS_GD:
1303 case R_386_TLS_GOTDESC:
1304 case R_386_TLS_DESC_CALL:
1305 case R_386_TLS_IE_32:
1306 case R_386_TLS_IE:
1307 case R_386_TLS_GOTIE:
1308 if (info->executable)
1309 {
1310 if (h == NULL)
1311 to_type = R_386_TLS_LE_32;
1312 else if (from_type != R_386_TLS_IE
1313 && from_type != R_386_TLS_GOTIE)
1314 to_type = R_386_TLS_IE_32;
1315 }
1316
1317 /* When we are called from elf_i386_relocate_section, CONTENTS
1318 isn't NULL and there may be additional transitions based on
1319 TLS_TYPE. */
1320 if (contents != NULL)
1321 {
1322 unsigned int new_to_type = to_type;
1323
1324 if (info->executable
1325 && h != NULL
1326 && h->dynindx == -1
1327 && (tls_type & GOT_TLS_IE))
1328 new_to_type = R_386_TLS_LE_32;
1329
1330 if (to_type == R_386_TLS_GD
1331 || to_type == R_386_TLS_GOTDESC
1332 || to_type == R_386_TLS_DESC_CALL)
1333 {
1334 if (tls_type == GOT_TLS_IE_POS)
1335 new_to_type = R_386_TLS_GOTIE;
1336 else if (tls_type & GOT_TLS_IE)
1337 new_to_type = R_386_TLS_IE_32;
1338 }
1339
1340 /* We checked the transition before when we were called from
1341 elf_i386_check_relocs. We only want to check the new
1342 transition which hasn't been checked before. */
1343 check = new_to_type != to_type && from_type == to_type;
1344 to_type = new_to_type;
1345 }
1346
1347 break;
1348
1349 case R_386_TLS_LDM:
1350 if (info->executable)
1351 to_type = R_386_TLS_LE_32;
1352 break;
1353
1354 default:
1355 return TRUE;
1356 }
1357
1358 /* Return TRUE if there is no transition. */
1359 if (from_type == to_type)
1360 return TRUE;
1361
1362 /* Check if the transition can be performed. */
1363 if (check
1364 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1365 symtab_hdr, sym_hashes,
1366 from_type, rel, relend))
1367 {
1368 reloc_howto_type *from, *to;
1369 const char *name;
1370
1371 from = elf_i386_rtype_to_howto (abfd, from_type);
1372 to = elf_i386_rtype_to_howto (abfd, to_type);
1373
1374 if (h)
1375 name = h->root.root.string;
1376 else
1377 {
1378 struct elf_i386_link_hash_table *htab;
1379
1380 htab = elf_i386_hash_table (info);
1381 if (htab == NULL)
1382 name = "*unknown*";
1383 else
1384 {
1385 Elf_Internal_Sym *isym;
1386
1387 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1388 abfd, r_symndx);
1389 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1390 }
1391 }
1392
1393 (*_bfd_error_handler)
1394 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1395 "in section `%A' failed"),
1396 abfd, sec, from->name, to->name, name,
1397 (unsigned long) rel->r_offset);
1398 bfd_set_error (bfd_error_bad_value);
1399 return FALSE;
1400 }
1401
1402 *r_type = to_type;
1403 return TRUE;
1404 }
1405
1406 /* Look through the relocs for a section during the first phase, and
1407 calculate needed space in the global offset table, procedure linkage
1408 table, and dynamic reloc sections. */
1409
1410 static bfd_boolean
1411 elf_i386_check_relocs (bfd *abfd,
1412 struct bfd_link_info *info,
1413 asection *sec,
1414 const Elf_Internal_Rela *relocs)
1415 {
1416 struct elf_i386_link_hash_table *htab;
1417 Elf_Internal_Shdr *symtab_hdr;
1418 struct elf_link_hash_entry **sym_hashes;
1419 const Elf_Internal_Rela *rel;
1420 const Elf_Internal_Rela *rel_end;
1421 asection *sreloc;
1422
1423 if (info->relocatable)
1424 return TRUE;
1425
1426 BFD_ASSERT (is_i386_elf (abfd));
1427
1428 htab = elf_i386_hash_table (info);
1429 if (htab == NULL)
1430 return FALSE;
1431
1432 symtab_hdr = &elf_symtab_hdr (abfd);
1433 sym_hashes = elf_sym_hashes (abfd);
1434
1435 sreloc = NULL;
1436
1437 rel_end = relocs + sec->reloc_count;
1438 for (rel = relocs; rel < rel_end; rel++)
1439 {
1440 unsigned int r_type;
1441 unsigned long r_symndx;
1442 struct elf_link_hash_entry *h;
1443 Elf_Internal_Sym *isym;
1444 const char *name;
1445 bfd_boolean size_reloc;
1446
1447 r_symndx = ELF32_R_SYM (rel->r_info);
1448 r_type = ELF32_R_TYPE (rel->r_info);
1449
1450 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1451 {
1452 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1453 abfd,
1454 r_symndx);
1455 return FALSE;
1456 }
1457
1458 if (r_symndx < symtab_hdr->sh_info)
1459 {
1460 /* A local symbol. */
1461 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1462 abfd, r_symndx);
1463 if (isym == NULL)
1464 return FALSE;
1465
1466 /* Check relocation against local STT_GNU_IFUNC symbol. */
1467 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1468 {
1469 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1470 if (h == NULL)
1471 return FALSE;
1472
1473 /* Fake a STT_GNU_IFUNC symbol. */
1474 h->type = STT_GNU_IFUNC;
1475 h->def_regular = 1;
1476 h->ref_regular = 1;
1477 h->forced_local = 1;
1478 h->root.type = bfd_link_hash_defined;
1479 }
1480 else
1481 h = NULL;
1482 }
1483 else
1484 {
1485 isym = NULL;
1486 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1487 while (h->root.type == bfd_link_hash_indirect
1488 || h->root.type == bfd_link_hash_warning)
1489 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1490 }
1491
1492 if (h != NULL)
1493 {
1494 /* Create the ifunc sections for static executables. If we
1495 never see an indirect function symbol nor we are building
1496 a static executable, those sections will be empty and
1497 won't appear in output. */
1498 switch (r_type)
1499 {
1500 default:
1501 break;
1502
1503 case R_386_32:
1504 case R_386_PC32:
1505 case R_386_PLT32:
1506 case R_386_GOT32:
1507 case R_386_GOTOFF:
1508 if (htab->elf.dynobj == NULL)
1509 htab->elf.dynobj = abfd;
1510 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1511 return FALSE;
1512 break;
1513 }
1514
1515 /* It is referenced by a non-shared object. */
1516 h->ref_regular = 1;
1517 h->root.non_ir_ref = 1;
1518 }
1519
1520 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1521 symtab_hdr, sym_hashes,
1522 &r_type, GOT_UNKNOWN,
1523 rel, rel_end, h, r_symndx))
1524 return FALSE;
1525
1526 switch (r_type)
1527 {
1528 case R_386_TLS_LDM:
1529 htab->tls_ldm_got.refcount += 1;
1530 goto create_got;
1531
1532 case R_386_PLT32:
1533 /* This symbol requires a procedure linkage table entry. We
1534 actually build the entry in adjust_dynamic_symbol,
1535 because this might be a case of linking PIC code which is
1536 never referenced by a dynamic object, in which case we
1537 don't need to generate a procedure linkage table entry
1538 after all. */
1539
1540 /* If this is a local symbol, we resolve it directly without
1541 creating a procedure linkage table entry. */
1542 if (h == NULL)
1543 continue;
1544
1545 h->needs_plt = 1;
1546 h->plt.refcount += 1;
1547 break;
1548
1549 case R_386_SIZE32:
1550 size_reloc = TRUE;
1551 goto do_size;
1552
1553 case R_386_TLS_IE_32:
1554 case R_386_TLS_IE:
1555 case R_386_TLS_GOTIE:
1556 if (!info->executable)
1557 info->flags |= DF_STATIC_TLS;
1558 /* Fall through */
1559
1560 case R_386_GOT32:
1561 case R_386_TLS_GD:
1562 case R_386_TLS_GOTDESC:
1563 case R_386_TLS_DESC_CALL:
1564 /* This symbol requires a global offset table entry. */
1565 {
1566 int tls_type, old_tls_type;
1567
1568 switch (r_type)
1569 {
1570 default:
1571 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1572 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1573 case R_386_TLS_GOTDESC:
1574 case R_386_TLS_DESC_CALL:
1575 tls_type = GOT_TLS_GDESC; break;
1576 case R_386_TLS_IE_32:
1577 if (ELF32_R_TYPE (rel->r_info) == r_type)
1578 tls_type = GOT_TLS_IE_NEG;
1579 else
1580 /* If this is a GD->IE transition, we may use either of
1581 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1582 tls_type = GOT_TLS_IE;
1583 break;
1584 case R_386_TLS_IE:
1585 case R_386_TLS_GOTIE:
1586 tls_type = GOT_TLS_IE_POS; break;
1587 }
1588
1589 if (h != NULL)
1590 {
1591 h->got.refcount += 1;
1592 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1593 }
1594 else
1595 {
1596 bfd_signed_vma *local_got_refcounts;
1597
1598 /* This is a global offset table entry for a local symbol. */
1599 local_got_refcounts = elf_local_got_refcounts (abfd);
1600 if (local_got_refcounts == NULL)
1601 {
1602 bfd_size_type size;
1603
1604 size = symtab_hdr->sh_info;
1605 size *= (sizeof (bfd_signed_vma)
1606 + sizeof (bfd_vma) + sizeof(char));
1607 local_got_refcounts = (bfd_signed_vma *)
1608 bfd_zalloc (abfd, size);
1609 if (local_got_refcounts == NULL)
1610 return FALSE;
1611 elf_local_got_refcounts (abfd) = local_got_refcounts;
1612 elf_i386_local_tlsdesc_gotent (abfd)
1613 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1614 elf_i386_local_got_tls_type (abfd)
1615 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1616 }
1617 local_got_refcounts[r_symndx] += 1;
1618 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1619 }
1620
1621 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1622 tls_type |= old_tls_type;
1623 /* If a TLS symbol is accessed using IE at least once,
1624 there is no point to use dynamic model for it. */
1625 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1626 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1627 || (tls_type & GOT_TLS_IE) == 0))
1628 {
1629 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1630 tls_type = old_tls_type;
1631 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1632 && GOT_TLS_GD_ANY_P (tls_type))
1633 tls_type |= old_tls_type;
1634 else
1635 {
1636 if (h)
1637 name = h->root.root.string;
1638 else
1639 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1640 NULL);
1641 (*_bfd_error_handler)
1642 (_("%B: `%s' accessed both as normal and "
1643 "thread local symbol"),
1644 abfd, name);
1645 bfd_set_error (bfd_error_bad_value);
1646 return FALSE;
1647 }
1648 }
1649
1650 if (old_tls_type != tls_type)
1651 {
1652 if (h != NULL)
1653 elf_i386_hash_entry (h)->tls_type = tls_type;
1654 else
1655 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1656 }
1657 }
1658 /* Fall through */
1659
1660 case R_386_GOTOFF:
1661 case R_386_GOTPC:
1662 create_got:
1663 if (htab->elf.sgot == NULL)
1664 {
1665 if (htab->elf.dynobj == NULL)
1666 htab->elf.dynobj = abfd;
1667 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1668 return FALSE;
1669 }
1670 if (r_type != R_386_TLS_IE)
1671 break;
1672 /* Fall through */
1673
1674 case R_386_TLS_LE_32:
1675 case R_386_TLS_LE:
1676 if (info->executable)
1677 break;
1678 info->flags |= DF_STATIC_TLS;
1679 /* Fall through */
1680
1681 case R_386_32:
1682 case R_386_PC32:
1683 if (h != NULL && info->executable)
1684 {
1685 /* If this reloc is in a read-only section, we might
1686 need a copy reloc. We can't check reliably at this
1687 stage whether the section is read-only, as input
1688 sections have not yet been mapped to output sections.
1689 Tentatively set the flag for now, and correct in
1690 adjust_dynamic_symbol. */
1691 h->non_got_ref = 1;
1692
1693 /* We may need a .plt entry if the function this reloc
1694 refers to is in a shared lib. */
1695 h->plt.refcount += 1;
1696 if (r_type != R_386_PC32)
1697 h->pointer_equality_needed = 1;
1698 }
1699
1700 size_reloc = FALSE;
1701 do_size:
1702 /* If we are creating a shared library, and this is a reloc
1703 against a global symbol, or a non PC relative reloc
1704 against a local symbol, then we need to copy the reloc
1705 into the shared library. However, if we are linking with
1706 -Bsymbolic, we do not need to copy a reloc against a
1707 global symbol which is defined in an object we are
1708 including in the link (i.e., DEF_REGULAR is set). At
1709 this point we have not seen all the input files, so it is
1710 possible that DEF_REGULAR is not set now but will be set
1711 later (it is never cleared). In case of a weak definition,
1712 DEF_REGULAR may be cleared later by a strong definition in
1713 a shared library. We account for that possibility below by
1714 storing information in the relocs_copied field of the hash
1715 table entry. A similar situation occurs when creating
1716 shared libraries and symbol visibility changes render the
1717 symbol local.
1718
1719 If on the other hand, we are creating an executable, we
1720 may need to keep relocations for symbols satisfied by a
1721 dynamic library if we manage to avoid copy relocs for the
1722 symbol. */
1723 if ((info->shared
1724 && (sec->flags & SEC_ALLOC) != 0
1725 && (r_type != R_386_PC32
1726 || (h != NULL
1727 && (! SYMBOLIC_BIND (info, h)
1728 || h->root.type == bfd_link_hash_defweak
1729 || !h->def_regular))))
1730 || (ELIMINATE_COPY_RELOCS
1731 && !info->shared
1732 && (sec->flags & SEC_ALLOC) != 0
1733 && h != NULL
1734 && (h->root.type == bfd_link_hash_defweak
1735 || !h->def_regular)))
1736 {
1737 struct elf_dyn_relocs *p;
1738 struct elf_dyn_relocs **head;
1739
1740 /* We must copy these reloc types into the output file.
1741 Create a reloc section in dynobj and make room for
1742 this reloc. */
1743 if (sreloc == NULL)
1744 {
1745 if (htab->elf.dynobj == NULL)
1746 htab->elf.dynobj = abfd;
1747
1748 sreloc = _bfd_elf_make_dynamic_reloc_section
1749 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1750
1751 if (sreloc == NULL)
1752 return FALSE;
1753 }
1754
1755 /* If this is a global symbol, we count the number of
1756 relocations we need for this symbol. */
1757 if (h != NULL)
1758 {
1759 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1760 }
1761 else
1762 {
1763 /* Track dynamic relocs needed for local syms too.
1764 We really need local syms available to do this
1765 easily. Oh well. */
1766 void **vpp;
1767 asection *s;
1768
1769 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1770 abfd, r_symndx);
1771 if (isym == NULL)
1772 return FALSE;
1773
1774 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1775 if (s == NULL)
1776 s = sec;
1777
1778 vpp = &elf_section_data (s)->local_dynrel;
1779 head = (struct elf_dyn_relocs **)vpp;
1780 }
1781
1782 p = *head;
1783 if (p == NULL || p->sec != sec)
1784 {
1785 bfd_size_type amt = sizeof *p;
1786 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1787 amt);
1788 if (p == NULL)
1789 return FALSE;
1790 p->next = *head;
1791 *head = p;
1792 p->sec = sec;
1793 p->count = 0;
1794 p->pc_count = 0;
1795 }
1796
1797 p->count += 1;
1798 /* Count size relocation as PC-relative relocation. */
1799 if (r_type == R_386_PC32 || size_reloc)
1800 p->pc_count += 1;
1801 }
1802 break;
1803
1804 /* This relocation describes the C++ object vtable hierarchy.
1805 Reconstruct it for later use during GC. */
1806 case R_386_GNU_VTINHERIT:
1807 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1808 return FALSE;
1809 break;
1810
1811 /* This relocation describes which C++ vtable entries are actually
1812 used. Record for later use during GC. */
1813 case R_386_GNU_VTENTRY:
1814 BFD_ASSERT (h != NULL);
1815 if (h != NULL
1816 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1817 return FALSE;
1818 break;
1819
1820 default:
1821 break;
1822 }
1823 }
1824
1825 return TRUE;
1826 }
1827
1828 /* Return the section that should be marked against GC for a given
1829 relocation. */
1830
1831 static asection *
1832 elf_i386_gc_mark_hook (asection *sec,
1833 struct bfd_link_info *info,
1834 Elf_Internal_Rela *rel,
1835 struct elf_link_hash_entry *h,
1836 Elf_Internal_Sym *sym)
1837 {
1838 if (h != NULL)
1839 switch (ELF32_R_TYPE (rel->r_info))
1840 {
1841 case R_386_GNU_VTINHERIT:
1842 case R_386_GNU_VTENTRY:
1843 return NULL;
1844 }
1845
1846 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1847 }
1848
1849 /* Update the got entry reference counts for the section being removed. */
1850
1851 static bfd_boolean
1852 elf_i386_gc_sweep_hook (bfd *abfd,
1853 struct bfd_link_info *info,
1854 asection *sec,
1855 const Elf_Internal_Rela *relocs)
1856 {
1857 struct elf_i386_link_hash_table *htab;
1858 Elf_Internal_Shdr *symtab_hdr;
1859 struct elf_link_hash_entry **sym_hashes;
1860 bfd_signed_vma *local_got_refcounts;
1861 const Elf_Internal_Rela *rel, *relend;
1862
1863 if (info->relocatable)
1864 return TRUE;
1865
1866 htab = elf_i386_hash_table (info);
1867 if (htab == NULL)
1868 return FALSE;
1869
1870 elf_section_data (sec)->local_dynrel = NULL;
1871
1872 symtab_hdr = &elf_symtab_hdr (abfd);
1873 sym_hashes = elf_sym_hashes (abfd);
1874 local_got_refcounts = elf_local_got_refcounts (abfd);
1875
1876 relend = relocs + sec->reloc_count;
1877 for (rel = relocs; rel < relend; rel++)
1878 {
1879 unsigned long r_symndx;
1880 unsigned int r_type;
1881 struct elf_link_hash_entry *h = NULL;
1882
1883 r_symndx = ELF32_R_SYM (rel->r_info);
1884 if (r_symndx >= symtab_hdr->sh_info)
1885 {
1886 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1887 while (h->root.type == bfd_link_hash_indirect
1888 || h->root.type == bfd_link_hash_warning)
1889 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1890 }
1891 else
1892 {
1893 /* A local symbol. */
1894 Elf_Internal_Sym *isym;
1895
1896 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1897 abfd, r_symndx);
1898
1899 /* Check relocation against local STT_GNU_IFUNC symbol. */
1900 if (isym != NULL
1901 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1902 {
1903 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1904 if (h == NULL)
1905 abort ();
1906 }
1907 }
1908
1909 if (h)
1910 {
1911 struct elf_i386_link_hash_entry *eh;
1912 struct elf_dyn_relocs **pp;
1913 struct elf_dyn_relocs *p;
1914
1915 eh = (struct elf_i386_link_hash_entry *) h;
1916 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1917 if (p->sec == sec)
1918 {
1919 /* Everything must go for SEC. */
1920 *pp = p->next;
1921 break;
1922 }
1923 }
1924
1925 r_type = ELF32_R_TYPE (rel->r_info);
1926 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1927 symtab_hdr, sym_hashes,
1928 &r_type, GOT_UNKNOWN,
1929 rel, relend, h, r_symndx))
1930 return FALSE;
1931
1932 switch (r_type)
1933 {
1934 case R_386_TLS_LDM:
1935 if (htab->tls_ldm_got.refcount > 0)
1936 htab->tls_ldm_got.refcount -= 1;
1937 break;
1938
1939 case R_386_TLS_GD:
1940 case R_386_TLS_GOTDESC:
1941 case R_386_TLS_DESC_CALL:
1942 case R_386_TLS_IE_32:
1943 case R_386_TLS_IE:
1944 case R_386_TLS_GOTIE:
1945 case R_386_GOT32:
1946 if (h != NULL)
1947 {
1948 if (h->got.refcount > 0)
1949 h->got.refcount -= 1;
1950 if (h->type == STT_GNU_IFUNC)
1951 {
1952 if (h->plt.refcount > 0)
1953 h->plt.refcount -= 1;
1954 }
1955 }
1956 else if (local_got_refcounts != NULL)
1957 {
1958 if (local_got_refcounts[r_symndx] > 0)
1959 local_got_refcounts[r_symndx] -= 1;
1960 }
1961 break;
1962
1963 case R_386_32:
1964 case R_386_PC32:
1965 case R_386_SIZE32:
1966 if (info->shared
1967 && (h == NULL || h->type != STT_GNU_IFUNC))
1968 break;
1969 /* Fall through */
1970
1971 case R_386_PLT32:
1972 if (h != NULL)
1973 {
1974 if (h->plt.refcount > 0)
1975 h->plt.refcount -= 1;
1976 }
1977 break;
1978
1979 case R_386_GOTOFF:
1980 if (h != NULL && h->type == STT_GNU_IFUNC)
1981 {
1982 if (h->got.refcount > 0)
1983 h->got.refcount -= 1;
1984 if (h->plt.refcount > 0)
1985 h->plt.refcount -= 1;
1986 }
1987 break;
1988
1989 default:
1990 break;
1991 }
1992 }
1993
1994 return TRUE;
1995 }
1996
1997 /* Adjust a symbol defined by a dynamic object and referenced by a
1998 regular object. The current definition is in some section of the
1999 dynamic object, but we're not including those sections. We have to
2000 change the definition to something the rest of the link can
2001 understand. */
2002
2003 static bfd_boolean
2004 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2005 struct elf_link_hash_entry *h)
2006 {
2007 struct elf_i386_link_hash_table *htab;
2008 asection *s;
2009 struct elf_i386_link_hash_entry *eh;
2010 struct elf_dyn_relocs *p;
2011
2012 /* STT_GNU_IFUNC symbol must go through PLT. */
2013 if (h->type == STT_GNU_IFUNC)
2014 {
2015 /* All local STT_GNU_IFUNC references must be treate as local
2016 calls via local PLT. */
2017 if (h->ref_regular
2018 && SYMBOL_CALLS_LOCAL (info, h))
2019 {
2020 bfd_size_type pc_count = 0, count = 0;
2021 struct elf_dyn_relocs **pp;
2022
2023 eh = (struct elf_i386_link_hash_entry *) h;
2024 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2025 {
2026 pc_count += p->pc_count;
2027 p->count -= p->pc_count;
2028 p->pc_count = 0;
2029 count += p->count;
2030 if (p->count == 0)
2031 *pp = p->next;
2032 else
2033 pp = &p->next;
2034 }
2035
2036 if (pc_count || count)
2037 {
2038 h->needs_plt = 1;
2039 h->non_got_ref = 1;
2040 if (h->plt.refcount <= 0)
2041 h->plt.refcount = 1;
2042 else
2043 h->plt.refcount += 1;
2044 }
2045 }
2046
2047 if (h->plt.refcount <= 0)
2048 {
2049 h->plt.offset = (bfd_vma) -1;
2050 h->needs_plt = 0;
2051 }
2052 return TRUE;
2053 }
2054
2055 /* If this is a function, put it in the procedure linkage table. We
2056 will fill in the contents of the procedure linkage table later,
2057 when we know the address of the .got section. */
2058 if (h->type == STT_FUNC
2059 || h->needs_plt)
2060 {
2061 if (h->plt.refcount <= 0
2062 || SYMBOL_CALLS_LOCAL (info, h)
2063 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2064 && h->root.type == bfd_link_hash_undefweak))
2065 {
2066 /* This case can occur if we saw a PLT32 reloc in an input
2067 file, but the symbol was never referred to by a dynamic
2068 object, or if all references were garbage collected. In
2069 such a case, we don't actually need to build a procedure
2070 linkage table, and we can just do a PC32 reloc instead. */
2071 h->plt.offset = (bfd_vma) -1;
2072 h->needs_plt = 0;
2073 }
2074
2075 return TRUE;
2076 }
2077 else
2078 /* It's possible that we incorrectly decided a .plt reloc was
2079 needed for an R_386_PC32 reloc to a non-function sym in
2080 check_relocs. We can't decide accurately between function and
2081 non-function syms in check-relocs; Objects loaded later in
2082 the link may change h->type. So fix it now. */
2083 h->plt.offset = (bfd_vma) -1;
2084
2085 /* If this is a weak symbol, and there is a real definition, the
2086 processor independent code will have arranged for us to see the
2087 real definition first, and we can just use the same value. */
2088 if (h->u.weakdef != NULL)
2089 {
2090 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2091 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2092 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2093 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2094 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2095 h->non_got_ref = h->u.weakdef->non_got_ref;
2096 return TRUE;
2097 }
2098
2099 /* This is a reference to a symbol defined by a dynamic object which
2100 is not a function. */
2101
2102 /* If we are creating a shared library, we must presume that the
2103 only references to the symbol are via the global offset table.
2104 For such cases we need not do anything here; the relocations will
2105 be handled correctly by relocate_section. */
2106 if (info->shared)
2107 return TRUE;
2108
2109 /* If there are no references to this symbol that do not use the
2110 GOT, we don't need to generate a copy reloc. */
2111 if (!h->non_got_ref)
2112 return TRUE;
2113
2114 /* If -z nocopyreloc was given, we won't generate them either. */
2115 if (info->nocopyreloc)
2116 {
2117 h->non_got_ref = 0;
2118 return TRUE;
2119 }
2120
2121 htab = elf_i386_hash_table (info);
2122 if (htab == NULL)
2123 return FALSE;
2124
2125 /* If there aren't any dynamic relocs in read-only sections, then
2126 we can keep the dynamic relocs and avoid the copy reloc. This
2127 doesn't work on VxWorks, where we can not have dynamic relocations
2128 (other than copy and jump slot relocations) in an executable. */
2129 if (ELIMINATE_COPY_RELOCS
2130 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2131 {
2132 eh = (struct elf_i386_link_hash_entry *) h;
2133 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2134 {
2135 s = p->sec->output_section;
2136 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2137 break;
2138 }
2139
2140 if (p == NULL)
2141 {
2142 h->non_got_ref = 0;
2143 return TRUE;
2144 }
2145 }
2146
2147 /* We must allocate the symbol in our .dynbss section, which will
2148 become part of the .bss section of the executable. There will be
2149 an entry for this symbol in the .dynsym section. The dynamic
2150 object will contain position independent code, so all references
2151 from the dynamic object to this symbol will go through the global
2152 offset table. The dynamic linker will use the .dynsym entry to
2153 determine the address it must put in the global offset table, so
2154 both the dynamic object and the regular object will refer to the
2155 same memory location for the variable. */
2156
2157 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2158 copy the initial value out of the dynamic object and into the
2159 runtime process image. */
2160 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2161 {
2162 htab->srelbss->size += sizeof (Elf32_External_Rel);
2163 h->needs_copy = 1;
2164 }
2165
2166 s = htab->sdynbss;
2167
2168 return _bfd_elf_adjust_dynamic_copy (h, s);
2169 }
2170
2171 /* Allocate space in .plt, .got and associated reloc sections for
2172 dynamic relocs. */
2173
2174 static bfd_boolean
2175 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2176 {
2177 struct bfd_link_info *info;
2178 struct elf_i386_link_hash_table *htab;
2179 struct elf_i386_link_hash_entry *eh;
2180 struct elf_dyn_relocs *p;
2181 unsigned plt_entry_size;
2182
2183 if (h->root.type == bfd_link_hash_indirect)
2184 return TRUE;
2185
2186 eh = (struct elf_i386_link_hash_entry *) h;
2187
2188 info = (struct bfd_link_info *) inf;
2189 htab = elf_i386_hash_table (info);
2190 if (htab == NULL)
2191 return FALSE;
2192
2193 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2194
2195 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2196 here if it is defined and referenced in a non-shared object. */
2197 if (h->type == STT_GNU_IFUNC
2198 && h->def_regular)
2199 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2200 plt_entry_size,
2201 plt_entry_size, 4);
2202 else if (htab->elf.dynamic_sections_created
2203 && h->plt.refcount > 0)
2204 {
2205 /* Make sure this symbol is output as a dynamic symbol.
2206 Undefined weak syms won't yet be marked as dynamic. */
2207 if (h->dynindx == -1
2208 && !h->forced_local)
2209 {
2210 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2211 return FALSE;
2212 }
2213
2214 if (info->shared
2215 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2216 {
2217 asection *s = htab->elf.splt;
2218
2219 /* If this is the first .plt entry, make room for the special
2220 first entry. */
2221 if (s->size == 0)
2222 s->size = plt_entry_size;
2223
2224 h->plt.offset = s->size;
2225
2226 /* If this symbol is not defined in a regular file, and we are
2227 not generating a shared library, then set the symbol to this
2228 location in the .plt. This is required to make function
2229 pointers compare as equal between the normal executable and
2230 the shared library. */
2231 if (! info->shared
2232 && !h->def_regular)
2233 {
2234 h->root.u.def.section = s;
2235 h->root.u.def.value = h->plt.offset;
2236 }
2237
2238 /* Make room for this entry. */
2239 s->size += plt_entry_size;
2240
2241 /* We also need to make an entry in the .got.plt section, which
2242 will be placed in the .got section by the linker script. */
2243 htab->elf.sgotplt->size += 4;
2244
2245 /* We also need to make an entry in the .rel.plt section. */
2246 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2247 htab->elf.srelplt->reloc_count++;
2248
2249 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2250 && !info->shared)
2251 {
2252 /* VxWorks has a second set of relocations for each PLT entry
2253 in executables. They go in a separate relocation section,
2254 which is processed by the kernel loader. */
2255
2256 /* There are two relocations for the initial PLT entry: an
2257 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2258 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2259
2260 if (h->plt.offset == plt_entry_size)
2261 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2262
2263 /* There are two extra relocations for each subsequent PLT entry:
2264 an R_386_32 relocation for the GOT entry, and an R_386_32
2265 relocation for the PLT entry. */
2266
2267 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2268 }
2269 }
2270 else
2271 {
2272 h->plt.offset = (bfd_vma) -1;
2273 h->needs_plt = 0;
2274 }
2275 }
2276 else
2277 {
2278 h->plt.offset = (bfd_vma) -1;
2279 h->needs_plt = 0;
2280 }
2281
2282 eh->tlsdesc_got = (bfd_vma) -1;
2283
2284 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2285 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2286 if (h->got.refcount > 0
2287 && info->executable
2288 && h->dynindx == -1
2289 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2290 h->got.offset = (bfd_vma) -1;
2291 else if (h->got.refcount > 0)
2292 {
2293 asection *s;
2294 bfd_boolean dyn;
2295 int tls_type = elf_i386_hash_entry(h)->tls_type;
2296
2297 /* Make sure this symbol is output as a dynamic symbol.
2298 Undefined weak syms won't yet be marked as dynamic. */
2299 if (h->dynindx == -1
2300 && !h->forced_local)
2301 {
2302 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2303 return FALSE;
2304 }
2305
2306 s = htab->elf.sgot;
2307 if (GOT_TLS_GDESC_P (tls_type))
2308 {
2309 eh->tlsdesc_got = htab->elf.sgotplt->size
2310 - elf_i386_compute_jump_table_size (htab);
2311 htab->elf.sgotplt->size += 8;
2312 h->got.offset = (bfd_vma) -2;
2313 }
2314 if (! GOT_TLS_GDESC_P (tls_type)
2315 || GOT_TLS_GD_P (tls_type))
2316 {
2317 h->got.offset = s->size;
2318 s->size += 4;
2319 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2320 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2321 s->size += 4;
2322 }
2323 dyn = htab->elf.dynamic_sections_created;
2324 /* R_386_TLS_IE_32 needs one dynamic relocation,
2325 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2326 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2327 need two), R_386_TLS_GD needs one if local symbol and two if
2328 global. */
2329 if (tls_type == GOT_TLS_IE_BOTH)
2330 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2331 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2332 || (tls_type & GOT_TLS_IE))
2333 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2334 else if (GOT_TLS_GD_P (tls_type))
2335 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2336 else if (! GOT_TLS_GDESC_P (tls_type)
2337 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2338 || h->root.type != bfd_link_hash_undefweak)
2339 && (info->shared
2340 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2341 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2342 if (GOT_TLS_GDESC_P (tls_type))
2343 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2344 }
2345 else
2346 h->got.offset = (bfd_vma) -1;
2347
2348 if (eh->dyn_relocs == NULL)
2349 return TRUE;
2350
2351 /* In the shared -Bsymbolic case, discard space allocated for
2352 dynamic pc-relative relocs against symbols which turn out to be
2353 defined in regular objects. For the normal shared case, discard
2354 space for pc-relative relocs that have become local due to symbol
2355 visibility changes. */
2356
2357 if (info->shared)
2358 {
2359 /* The only reloc that uses pc_count is R_386_PC32, which will
2360 appear on a call or on something like ".long foo - .". We
2361 want calls to protected symbols to resolve directly to the
2362 function rather than going via the plt. If people want
2363 function pointer comparisons to work as expected then they
2364 should avoid writing assembly like ".long foo - .". */
2365 if (SYMBOL_CALLS_LOCAL (info, h))
2366 {
2367 struct elf_dyn_relocs **pp;
2368
2369 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2370 {
2371 /* Don't update reloc count if there are any non
2372 pc-relative relocs. */
2373 if (!h->pointer_equality_needed)
2374 {
2375 p->count -= p->pc_count;
2376 p->pc_count = 0;
2377 }
2378 if (p->count == 0)
2379 *pp = p->next;
2380 else
2381 pp = &p->next;
2382 }
2383 }
2384
2385 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2386 {
2387 struct elf_dyn_relocs **pp;
2388 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2389 {
2390 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2391 *pp = p->next;
2392 else
2393 pp = &p->next;
2394 }
2395 }
2396
2397 /* Also discard relocs on undefined weak syms with non-default
2398 visibility. */
2399 if (eh->dyn_relocs != NULL
2400 && h->root.type == bfd_link_hash_undefweak)
2401 {
2402 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2403 eh->dyn_relocs = NULL;
2404
2405 /* Make sure undefined weak symbols are output as a dynamic
2406 symbol in PIEs. */
2407 else if (h->dynindx == -1
2408 && !h->forced_local)
2409 {
2410 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2411 return FALSE;
2412 }
2413 }
2414 }
2415 else if (ELIMINATE_COPY_RELOCS)
2416 {
2417 /* For the non-shared case, discard space for relocs against
2418 symbols which turn out to need copy relocs or are not
2419 dynamic. */
2420
2421 if (!h->non_got_ref
2422 && ((h->def_dynamic
2423 && !h->def_regular)
2424 || (htab->elf.dynamic_sections_created
2425 && (h->root.type == bfd_link_hash_undefweak
2426 || h->root.type == bfd_link_hash_undefined))))
2427 {
2428 /* Make sure this symbol is output as a dynamic symbol.
2429 Undefined weak syms won't yet be marked as dynamic. */
2430 if (h->dynindx == -1
2431 && !h->forced_local)
2432 {
2433 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2434 return FALSE;
2435 }
2436
2437 /* If that succeeded, we know we'll be keeping all the
2438 relocs. */
2439 if (h->dynindx != -1)
2440 goto keep;
2441 }
2442
2443 eh->dyn_relocs = NULL;
2444
2445 keep: ;
2446 }
2447
2448 /* Finally, allocate space. */
2449 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2450 {
2451 asection *sreloc;
2452
2453 sreloc = elf_section_data (p->sec)->sreloc;
2454
2455 BFD_ASSERT (sreloc != NULL);
2456 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2457 }
2458
2459 return TRUE;
2460 }
2461
2462 /* Allocate space in .plt, .got and associated reloc sections for
2463 local dynamic relocs. */
2464
2465 static bfd_boolean
2466 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2467 {
2468 struct elf_link_hash_entry *h
2469 = (struct elf_link_hash_entry *) *slot;
2470
2471 if (h->type != STT_GNU_IFUNC
2472 || !h->def_regular
2473 || !h->ref_regular
2474 || !h->forced_local
2475 || h->root.type != bfd_link_hash_defined)
2476 abort ();
2477
2478 return elf_i386_allocate_dynrelocs (h, inf);
2479 }
2480
2481 /* Find any dynamic relocs that apply to read-only sections. */
2482
2483 static bfd_boolean
2484 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2485 {
2486 struct elf_i386_link_hash_entry *eh;
2487 struct elf_dyn_relocs *p;
2488
2489 /* Skip local IFUNC symbols. */
2490 if (h->forced_local && h->type == STT_GNU_IFUNC)
2491 return TRUE;
2492
2493 eh = (struct elf_i386_link_hash_entry *) h;
2494 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2495 {
2496 asection *s = p->sec->output_section;
2497
2498 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2499 {
2500 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2501
2502 info->flags |= DF_TEXTREL;
2503
2504 if (info->warn_shared_textrel && info->shared)
2505 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2506 p->sec->owner, h->root.root.string,
2507 p->sec);
2508
2509 /* Not an error, just cut short the traversal. */
2510 return FALSE;
2511 }
2512 }
2513 return TRUE;
2514 }
2515
2516 /* Convert
2517 mov foo@GOT(%reg), %reg
2518 to
2519 lea foo@GOTOFF(%reg), %reg
2520 with the local symbol, foo. */
2521
2522 static bfd_boolean
2523 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2524 struct bfd_link_info *link_info)
2525 {
2526 Elf_Internal_Shdr *symtab_hdr;
2527 Elf_Internal_Rela *internal_relocs;
2528 Elf_Internal_Rela *irel, *irelend;
2529 bfd_byte *contents;
2530 struct elf_i386_link_hash_table *htab;
2531 bfd_boolean changed_contents;
2532 bfd_boolean changed_relocs;
2533 bfd_signed_vma *local_got_refcounts;
2534
2535 /* Don't even try to convert non-ELF outputs. */
2536 if (!is_elf_hash_table (link_info->hash))
2537 return FALSE;
2538
2539 /* Nothing to do if there are no codes, no relocations or no output. */
2540 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2541 || sec->reloc_count == 0
2542 || discarded_section (sec))
2543 return TRUE;
2544
2545 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2546
2547 /* Load the relocations for this section. */
2548 internal_relocs = (_bfd_elf_link_read_relocs
2549 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2550 link_info->keep_memory));
2551 if (internal_relocs == NULL)
2552 return FALSE;
2553
2554 htab = elf_i386_hash_table (link_info);
2555 changed_contents = FALSE;
2556 changed_relocs = FALSE;
2557 local_got_refcounts = elf_local_got_refcounts (abfd);
2558
2559 /* Get the section contents. */
2560 if (elf_section_data (sec)->this_hdr.contents != NULL)
2561 contents = elf_section_data (sec)->this_hdr.contents;
2562 else
2563 {
2564 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2565 goto error_return;
2566 }
2567
2568 irelend = internal_relocs + sec->reloc_count;
2569 for (irel = internal_relocs; irel < irelend; irel++)
2570 {
2571 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2572 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2573 unsigned int indx;
2574 struct elf_link_hash_entry *h;
2575
2576 if (r_type != R_386_GOT32)
2577 continue;
2578
2579 /* Get the symbol referred to by the reloc. */
2580 if (r_symndx < symtab_hdr->sh_info)
2581 {
2582 Elf_Internal_Sym *isym;
2583
2584 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2585 abfd, r_symndx);
2586
2587 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2588 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2589 && bfd_get_8 (input_bfd,
2590 contents + irel->r_offset - 2) == 0x8b)
2591 {
2592 bfd_put_8 (output_bfd, 0x8d,
2593 contents + irel->r_offset - 2);
2594 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2595 if (local_got_refcounts != NULL
2596 && local_got_refcounts[r_symndx] > 0)
2597 local_got_refcounts[r_symndx] -= 1;
2598 changed_contents = TRUE;
2599 changed_relocs = TRUE;
2600 }
2601 continue;
2602 }
2603
2604 indx = r_symndx - symtab_hdr->sh_info;
2605 h = elf_sym_hashes (abfd)[indx];
2606 BFD_ASSERT (h != NULL);
2607
2608 while (h->root.type == bfd_link_hash_indirect
2609 || h->root.type == bfd_link_hash_warning)
2610 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2611
2612 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2613 optimizing _DYNAMIC since ld.so may use its link-time address. */
2614 if (h->def_regular
2615 && h->type != STT_GNU_IFUNC
2616 && h != htab->elf.hdynamic
2617 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2618 && bfd_get_8 (input_bfd,
2619 contents + irel->r_offset - 2) == 0x8b)
2620 {
2621 bfd_put_8 (output_bfd, 0x8d,
2622 contents + irel->r_offset - 2);
2623 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2624 if (h->got.refcount > 0)
2625 h->got.refcount -= 1;
2626 changed_contents = TRUE;
2627 changed_relocs = TRUE;
2628 }
2629 }
2630
2631 if (contents != NULL
2632 && elf_section_data (sec)->this_hdr.contents != contents)
2633 {
2634 if (!changed_contents && !link_info->keep_memory)
2635 free (contents);
2636 else
2637 {
2638 /* Cache the section contents for elf_link_input_bfd. */
2639 elf_section_data (sec)->this_hdr.contents = contents;
2640 }
2641 }
2642
2643 if (elf_section_data (sec)->relocs != internal_relocs)
2644 {
2645 if (!changed_relocs)
2646 free (internal_relocs);
2647 else
2648 elf_section_data (sec)->relocs = internal_relocs;
2649 }
2650
2651 return TRUE;
2652
2653 error_return:
2654 if (contents != NULL
2655 && elf_section_data (sec)->this_hdr.contents != contents)
2656 free (contents);
2657 if (internal_relocs != NULL
2658 && elf_section_data (sec)->relocs != internal_relocs)
2659 free (internal_relocs);
2660 return FALSE;
2661 }
2662
2663 /* Set the sizes of the dynamic sections. */
2664
2665 static bfd_boolean
2666 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2667 {
2668 struct elf_i386_link_hash_table *htab;
2669 bfd *dynobj;
2670 asection *s;
2671 bfd_boolean relocs;
2672 bfd *ibfd;
2673
2674 htab = elf_i386_hash_table (info);
2675 if (htab == NULL)
2676 return FALSE;
2677 dynobj = htab->elf.dynobj;
2678 if (dynobj == NULL)
2679 abort ();
2680
2681 if (htab->elf.dynamic_sections_created)
2682 {
2683 /* Set the contents of the .interp section to the interpreter. */
2684 if (info->executable)
2685 {
2686 s = bfd_get_linker_section (dynobj, ".interp");
2687 if (s == NULL)
2688 abort ();
2689 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2690 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2691 }
2692 }
2693
2694 /* Set up .got offsets for local syms, and space for local dynamic
2695 relocs. */
2696 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2697 {
2698 bfd_signed_vma *local_got;
2699 bfd_signed_vma *end_local_got;
2700 char *local_tls_type;
2701 bfd_vma *local_tlsdesc_gotent;
2702 bfd_size_type locsymcount;
2703 Elf_Internal_Shdr *symtab_hdr;
2704 asection *srel;
2705
2706 if (! is_i386_elf (ibfd))
2707 continue;
2708
2709 for (s = ibfd->sections; s != NULL; s = s->next)
2710 {
2711 struct elf_dyn_relocs *p;
2712
2713 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2714 return FALSE;
2715
2716 for (p = ((struct elf_dyn_relocs *)
2717 elf_section_data (s)->local_dynrel);
2718 p != NULL;
2719 p = p->next)
2720 {
2721 if (!bfd_is_abs_section (p->sec)
2722 && bfd_is_abs_section (p->sec->output_section))
2723 {
2724 /* Input section has been discarded, either because
2725 it is a copy of a linkonce section or due to
2726 linker script /DISCARD/, so we'll be discarding
2727 the relocs too. */
2728 }
2729 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2730 && strcmp (p->sec->output_section->name,
2731 ".tls_vars") == 0)
2732 {
2733 /* Relocations in vxworks .tls_vars sections are
2734 handled specially by the loader. */
2735 }
2736 else if (p->count != 0)
2737 {
2738 srel = elf_section_data (p->sec)->sreloc;
2739 srel->size += p->count * sizeof (Elf32_External_Rel);
2740 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2741 && (info->flags & DF_TEXTREL) == 0)
2742 {
2743 info->flags |= DF_TEXTREL;
2744 if (info->warn_shared_textrel && info->shared)
2745 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2746 p->sec->owner, p->sec);
2747 }
2748 }
2749 }
2750 }
2751
2752 local_got = elf_local_got_refcounts (ibfd);
2753 if (!local_got)
2754 continue;
2755
2756 symtab_hdr = &elf_symtab_hdr (ibfd);
2757 locsymcount = symtab_hdr->sh_info;
2758 end_local_got = local_got + locsymcount;
2759 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2760 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2761 s = htab->elf.sgot;
2762 srel = htab->elf.srelgot;
2763 for (; local_got < end_local_got;
2764 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2765 {
2766 *local_tlsdesc_gotent = (bfd_vma) -1;
2767 if (*local_got > 0)
2768 {
2769 if (GOT_TLS_GDESC_P (*local_tls_type))
2770 {
2771 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2772 - elf_i386_compute_jump_table_size (htab);
2773 htab->elf.sgotplt->size += 8;
2774 *local_got = (bfd_vma) -2;
2775 }
2776 if (! GOT_TLS_GDESC_P (*local_tls_type)
2777 || GOT_TLS_GD_P (*local_tls_type))
2778 {
2779 *local_got = s->size;
2780 s->size += 4;
2781 if (GOT_TLS_GD_P (*local_tls_type)
2782 || *local_tls_type == GOT_TLS_IE_BOTH)
2783 s->size += 4;
2784 }
2785 if (info->shared
2786 || GOT_TLS_GD_ANY_P (*local_tls_type)
2787 || (*local_tls_type & GOT_TLS_IE))
2788 {
2789 if (*local_tls_type == GOT_TLS_IE_BOTH)
2790 srel->size += 2 * sizeof (Elf32_External_Rel);
2791 else if (GOT_TLS_GD_P (*local_tls_type)
2792 || ! GOT_TLS_GDESC_P (*local_tls_type))
2793 srel->size += sizeof (Elf32_External_Rel);
2794 if (GOT_TLS_GDESC_P (*local_tls_type))
2795 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2796 }
2797 }
2798 else
2799 *local_got = (bfd_vma) -1;
2800 }
2801 }
2802
2803 if (htab->tls_ldm_got.refcount > 0)
2804 {
2805 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2806 relocs. */
2807 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2808 htab->elf.sgot->size += 8;
2809 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2810 }
2811 else
2812 htab->tls_ldm_got.offset = -1;
2813
2814 /* Allocate global sym .plt and .got entries, and space for global
2815 sym dynamic relocs. */
2816 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2817
2818 /* Allocate .plt and .got entries, and space for local symbols. */
2819 htab_traverse (htab->loc_hash_table,
2820 elf_i386_allocate_local_dynrelocs,
2821 info);
2822
2823 /* For every jump slot reserved in the sgotplt, reloc_count is
2824 incremented. However, when we reserve space for TLS descriptors,
2825 it's not incremented, so in order to compute the space reserved
2826 for them, it suffices to multiply the reloc count by the jump
2827 slot size.
2828
2829 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2830 so that R_386_IRELATIVE entries come last. */
2831 if (htab->elf.srelplt)
2832 {
2833 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2834 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2835 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2836 }
2837 else if (htab->elf.irelplt)
2838 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2839
2840
2841 if (htab->elf.sgotplt)
2842 {
2843 /* Don't allocate .got.plt section if there are no GOT nor PLT
2844 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2845 if ((htab->elf.hgot == NULL
2846 || !htab->elf.hgot->ref_regular_nonweak)
2847 && (htab->elf.sgotplt->size
2848 == get_elf_backend_data (output_bfd)->got_header_size)
2849 && (htab->elf.splt == NULL
2850 || htab->elf.splt->size == 0)
2851 && (htab->elf.sgot == NULL
2852 || htab->elf.sgot->size == 0)
2853 && (htab->elf.iplt == NULL
2854 || htab->elf.iplt->size == 0)
2855 && (htab->elf.igotplt == NULL
2856 || htab->elf.igotplt->size == 0))
2857 htab->elf.sgotplt->size = 0;
2858 }
2859
2860
2861 if (htab->plt_eh_frame != NULL
2862 && htab->elf.splt != NULL
2863 && htab->elf.splt->size != 0
2864 && !bfd_is_abs_section (htab->elf.splt->output_section)
2865 && _bfd_elf_eh_frame_present (info))
2866 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2867
2868 /* We now have determined the sizes of the various dynamic sections.
2869 Allocate memory for them. */
2870 relocs = FALSE;
2871 for (s = dynobj->sections; s != NULL; s = s->next)
2872 {
2873 bfd_boolean strip_section = TRUE;
2874
2875 if ((s->flags & SEC_LINKER_CREATED) == 0)
2876 continue;
2877
2878 if (s == htab->elf.splt
2879 || s == htab->elf.sgot)
2880 {
2881 /* Strip this section if we don't need it; see the
2882 comment below. */
2883 /* We'd like to strip these sections if they aren't needed, but if
2884 we've exported dynamic symbols from them we must leave them.
2885 It's too late to tell BFD to get rid of the symbols. */
2886
2887 if (htab->elf.hplt != NULL)
2888 strip_section = FALSE;
2889 }
2890 else if (s == htab->elf.sgotplt
2891 || s == htab->elf.iplt
2892 || s == htab->elf.igotplt
2893 || s == htab->plt_eh_frame
2894 || s == htab->sdynbss)
2895 {
2896 /* Strip these too. */
2897 }
2898 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2899 {
2900 if (s->size != 0
2901 && s != htab->elf.srelplt
2902 && s != htab->srelplt2)
2903 relocs = TRUE;
2904
2905 /* We use the reloc_count field as a counter if we need
2906 to copy relocs into the output file. */
2907 s->reloc_count = 0;
2908 }
2909 else
2910 {
2911 /* It's not one of our sections, so don't allocate space. */
2912 continue;
2913 }
2914
2915 if (s->size == 0)
2916 {
2917 /* If we don't need this section, strip it from the
2918 output file. This is mostly to handle .rel.bss and
2919 .rel.plt. We must create both sections in
2920 create_dynamic_sections, because they must be created
2921 before the linker maps input sections to output
2922 sections. The linker does that before
2923 adjust_dynamic_symbol is called, and it is that
2924 function which decides whether anything needs to go
2925 into these sections. */
2926 if (strip_section)
2927 s->flags |= SEC_EXCLUDE;
2928 continue;
2929 }
2930
2931 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2932 continue;
2933
2934 /* Allocate memory for the section contents. We use bfd_zalloc
2935 here in case unused entries are not reclaimed before the
2936 section's contents are written out. This should not happen,
2937 but this way if it does, we get a R_386_NONE reloc instead
2938 of garbage. */
2939 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2940 if (s->contents == NULL)
2941 return FALSE;
2942 }
2943
2944 if (htab->plt_eh_frame != NULL
2945 && htab->plt_eh_frame->contents != NULL)
2946 {
2947 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2948 sizeof (elf_i386_eh_frame_plt));
2949 bfd_put_32 (dynobj, htab->elf.splt->size,
2950 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2951 }
2952
2953 if (htab->elf.dynamic_sections_created)
2954 {
2955 /* Add some entries to the .dynamic section. We fill in the
2956 values later, in elf_i386_finish_dynamic_sections, but we
2957 must add the entries now so that we get the correct size for
2958 the .dynamic section. The DT_DEBUG entry is filled in by the
2959 dynamic linker and used by the debugger. */
2960 #define add_dynamic_entry(TAG, VAL) \
2961 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2962
2963 if (info->executable)
2964 {
2965 if (!add_dynamic_entry (DT_DEBUG, 0))
2966 return FALSE;
2967 }
2968
2969 if (htab->elf.splt->size != 0)
2970 {
2971 if (!add_dynamic_entry (DT_PLTGOT, 0)
2972 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2973 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2974 || !add_dynamic_entry (DT_JMPREL, 0))
2975 return FALSE;
2976 }
2977
2978 if (relocs)
2979 {
2980 if (!add_dynamic_entry (DT_REL, 0)
2981 || !add_dynamic_entry (DT_RELSZ, 0)
2982 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2983 return FALSE;
2984
2985 /* If any dynamic relocs apply to a read-only section,
2986 then we need a DT_TEXTREL entry. */
2987 if ((info->flags & DF_TEXTREL) == 0)
2988 elf_link_hash_traverse (&htab->elf,
2989 elf_i386_readonly_dynrelocs, info);
2990
2991 if ((info->flags & DF_TEXTREL) != 0)
2992 {
2993 if (!add_dynamic_entry (DT_TEXTREL, 0))
2994 return FALSE;
2995 }
2996 }
2997 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2998 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2999 return FALSE;
3000 }
3001 #undef add_dynamic_entry
3002
3003 return TRUE;
3004 }
3005
3006 static bfd_boolean
3007 elf_i386_always_size_sections (bfd *output_bfd,
3008 struct bfd_link_info *info)
3009 {
3010 asection *tls_sec = elf_hash_table (info)->tls_sec;
3011
3012 if (tls_sec)
3013 {
3014 struct elf_link_hash_entry *tlsbase;
3015
3016 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3017 "_TLS_MODULE_BASE_",
3018 FALSE, FALSE, FALSE);
3019
3020 if (tlsbase && tlsbase->type == STT_TLS)
3021 {
3022 struct elf_i386_link_hash_table *htab;
3023 struct bfd_link_hash_entry *bh = NULL;
3024 const struct elf_backend_data *bed
3025 = get_elf_backend_data (output_bfd);
3026
3027 htab = elf_i386_hash_table (info);
3028 if (htab == NULL)
3029 return FALSE;
3030
3031 if (!(_bfd_generic_link_add_one_symbol
3032 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3033 tls_sec, 0, NULL, FALSE,
3034 bed->collect, &bh)))
3035 return FALSE;
3036
3037 htab->tls_module_base = bh;
3038
3039 tlsbase = (struct elf_link_hash_entry *)bh;
3040 tlsbase->def_regular = 1;
3041 tlsbase->other = STV_HIDDEN;
3042 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3043 }
3044 }
3045
3046 return TRUE;
3047 }
3048
3049 /* Set the correct type for an x86 ELF section. We do this by the
3050 section name, which is a hack, but ought to work. */
3051
3052 static bfd_boolean
3053 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3054 Elf_Internal_Shdr *hdr,
3055 asection *sec)
3056 {
3057 const char *name;
3058
3059 name = bfd_get_section_name (abfd, sec);
3060
3061 /* This is an ugly, but unfortunately necessary hack that is
3062 needed when producing EFI binaries on x86. It tells
3063 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3064 containing ELF relocation info. We need this hack in order to
3065 be able to generate ELF binaries that can be translated into
3066 EFI applications (which are essentially COFF objects). Those
3067 files contain a COFF ".reloc" section inside an ELFNN object,
3068 which would normally cause BFD to segfault because it would
3069 attempt to interpret this section as containing relocation
3070 entries for section "oc". With this hack enabled, ".reloc"
3071 will be treated as a normal data section, which will avoid the
3072 segfault. However, you won't be able to create an ELFNN binary
3073 with a section named "oc" that needs relocations, but that's
3074 the kind of ugly side-effects you get when detecting section
3075 types based on their names... In practice, this limitation is
3076 unlikely to bite. */
3077 if (strcmp (name, ".reloc") == 0)
3078 hdr->sh_type = SHT_PROGBITS;
3079
3080 return TRUE;
3081 }
3082
3083 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3084 executables. Rather than setting it to the beginning of the TLS
3085 section, we have to set it to the end. This function may be called
3086 multiple times, it is idempotent. */
3087
3088 static void
3089 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3090 {
3091 struct elf_i386_link_hash_table *htab;
3092 struct bfd_link_hash_entry *base;
3093
3094 if (!info->executable)
3095 return;
3096
3097 htab = elf_i386_hash_table (info);
3098 if (htab == NULL)
3099 return;
3100
3101 base = htab->tls_module_base;
3102 if (base == NULL)
3103 return;
3104
3105 base->u.def.value = htab->elf.tls_size;
3106 }
3107
3108 /* Return the base VMA address which should be subtracted from real addresses
3109 when resolving @dtpoff relocation.
3110 This is PT_TLS segment p_vaddr. */
3111
3112 static bfd_vma
3113 elf_i386_dtpoff_base (struct bfd_link_info *info)
3114 {
3115 /* If tls_sec is NULL, we should have signalled an error already. */
3116 if (elf_hash_table (info)->tls_sec == NULL)
3117 return 0;
3118 return elf_hash_table (info)->tls_sec->vma;
3119 }
3120
3121 /* Return the relocation value for @tpoff relocation
3122 if STT_TLS virtual address is ADDRESS. */
3123
3124 static bfd_vma
3125 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3126 {
3127 struct elf_link_hash_table *htab = elf_hash_table (info);
3128 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3129 bfd_vma static_tls_size;
3130
3131 /* If tls_sec is NULL, we should have signalled an error already. */
3132 if (htab->tls_sec == NULL)
3133 return 0;
3134
3135 /* Consider special static TLS alignment requirements. */
3136 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3137 return static_tls_size + htab->tls_sec->vma - address;
3138 }
3139
3140 /* Relocate an i386 ELF section. */
3141
3142 static bfd_boolean
3143 elf_i386_relocate_section (bfd *output_bfd,
3144 struct bfd_link_info *info,
3145 bfd *input_bfd,
3146 asection *input_section,
3147 bfd_byte *contents,
3148 Elf_Internal_Rela *relocs,
3149 Elf_Internal_Sym *local_syms,
3150 asection **local_sections)
3151 {
3152 struct elf_i386_link_hash_table *htab;
3153 Elf_Internal_Shdr *symtab_hdr;
3154 struct elf_link_hash_entry **sym_hashes;
3155 bfd_vma *local_got_offsets;
3156 bfd_vma *local_tlsdesc_gotents;
3157 Elf_Internal_Rela *rel;
3158 Elf_Internal_Rela *relend;
3159 bfd_boolean is_vxworks_tls;
3160 unsigned plt_entry_size;
3161
3162 BFD_ASSERT (is_i386_elf (input_bfd));
3163
3164 htab = elf_i386_hash_table (info);
3165 if (htab == NULL)
3166 return FALSE;
3167 symtab_hdr = &elf_symtab_hdr (input_bfd);
3168 sym_hashes = elf_sym_hashes (input_bfd);
3169 local_got_offsets = elf_local_got_offsets (input_bfd);
3170 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3171 /* We have to handle relocations in vxworks .tls_vars sections
3172 specially, because the dynamic loader is 'weird'. */
3173 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3174 && info->shared
3175 && !strcmp (input_section->output_section->name,
3176 ".tls_vars"));
3177
3178 elf_i386_set_tls_module_base (info);
3179
3180 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3181
3182 rel = relocs;
3183 relend = relocs + input_section->reloc_count;
3184 for (; rel < relend; rel++)
3185 {
3186 unsigned int r_type;
3187 reloc_howto_type *howto;
3188 unsigned long r_symndx;
3189 struct elf_link_hash_entry *h;
3190 Elf_Internal_Sym *sym;
3191 asection *sec;
3192 bfd_vma off, offplt;
3193 bfd_vma relocation;
3194 bfd_boolean unresolved_reloc;
3195 bfd_reloc_status_type r;
3196 unsigned int indx;
3197 int tls_type;
3198 bfd_vma st_size;
3199
3200 r_type = ELF32_R_TYPE (rel->r_info);
3201 if (r_type == R_386_GNU_VTINHERIT
3202 || r_type == R_386_GNU_VTENTRY)
3203 continue;
3204
3205 if ((indx = r_type) >= R_386_standard
3206 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3207 >= R_386_ext - R_386_standard)
3208 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3209 >= R_386_irelative - R_386_ext))
3210 {
3211 (*_bfd_error_handler)
3212 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3213 input_bfd, input_section, r_type);
3214 bfd_set_error (bfd_error_bad_value);
3215 return FALSE;
3216 }
3217 howto = elf_howto_table + indx;
3218
3219 r_symndx = ELF32_R_SYM (rel->r_info);
3220 h = NULL;
3221 sym = NULL;
3222 sec = NULL;
3223 unresolved_reloc = FALSE;
3224 if (r_symndx < symtab_hdr->sh_info)
3225 {
3226 sym = local_syms + r_symndx;
3227 sec = local_sections[r_symndx];
3228 relocation = (sec->output_section->vma
3229 + sec->output_offset
3230 + sym->st_value);
3231 st_size = sym->st_size;
3232
3233 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3234 && ((sec->flags & SEC_MERGE) != 0
3235 || (info->relocatable
3236 && sec->output_offset != 0)))
3237 {
3238 bfd_vma addend;
3239 bfd_byte *where = contents + rel->r_offset;
3240
3241 switch (howto->size)
3242 {
3243 case 0:
3244 addend = bfd_get_8 (input_bfd, where);
3245 if (howto->pc_relative)
3246 {
3247 addend = (addend ^ 0x80) - 0x80;
3248 addend += 1;
3249 }
3250 break;
3251 case 1:
3252 addend = bfd_get_16 (input_bfd, where);
3253 if (howto->pc_relative)
3254 {
3255 addend = (addend ^ 0x8000) - 0x8000;
3256 addend += 2;
3257 }
3258 break;
3259 case 2:
3260 addend = bfd_get_32 (input_bfd, where);
3261 if (howto->pc_relative)
3262 {
3263 addend = (addend ^ 0x80000000) - 0x80000000;
3264 addend += 4;
3265 }
3266 break;
3267 default:
3268 abort ();
3269 }
3270
3271 if (info->relocatable)
3272 addend += sec->output_offset;
3273 else
3274 {
3275 asection *msec = sec;
3276 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3277 addend);
3278 addend -= relocation;
3279 addend += msec->output_section->vma + msec->output_offset;
3280 }
3281
3282 switch (howto->size)
3283 {
3284 case 0:
3285 /* FIXME: overflow checks. */
3286 if (howto->pc_relative)
3287 addend -= 1;
3288 bfd_put_8 (input_bfd, addend, where);
3289 break;
3290 case 1:
3291 if (howto->pc_relative)
3292 addend -= 2;
3293 bfd_put_16 (input_bfd, addend, where);
3294 break;
3295 case 2:
3296 if (howto->pc_relative)
3297 addend -= 4;
3298 bfd_put_32 (input_bfd, addend, where);
3299 break;
3300 }
3301 }
3302 else if (!info->relocatable
3303 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3304 {
3305 /* Relocate against local STT_GNU_IFUNC symbol. */
3306 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3307 FALSE);
3308 if (h == NULL)
3309 abort ();
3310
3311 /* Set STT_GNU_IFUNC symbol value. */
3312 h->root.u.def.value = sym->st_value;
3313 h->root.u.def.section = sec;
3314 }
3315 }
3316 else
3317 {
3318 bfd_boolean warned ATTRIBUTE_UNUSED;
3319 bfd_boolean ignored ATTRIBUTE_UNUSED;
3320
3321 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3322 r_symndx, symtab_hdr, sym_hashes,
3323 h, sec, relocation,
3324 unresolved_reloc, warned, ignored);
3325 st_size = h->size;
3326 }
3327
3328 if (sec != NULL && discarded_section (sec))
3329 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3330 rel, 1, relend, howto, 0, contents);
3331
3332 if (info->relocatable)
3333 continue;
3334
3335 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3336 it here if it is defined in a non-shared object. */
3337 if (h != NULL
3338 && h->type == STT_GNU_IFUNC
3339 && h->def_regular)
3340 {
3341 asection *plt, *gotplt, *base_got;
3342 bfd_vma plt_index;
3343 const char *name;
3344
3345 if ((input_section->flags & SEC_ALLOC) == 0
3346 || h->plt.offset == (bfd_vma) -1)
3347 abort ();
3348
3349 /* STT_GNU_IFUNC symbol must go through PLT. */
3350 if (htab->elf.splt != NULL)
3351 {
3352 plt = htab->elf.splt;
3353 gotplt = htab->elf.sgotplt;
3354 }
3355 else
3356 {
3357 plt = htab->elf.iplt;
3358 gotplt = htab->elf.igotplt;
3359 }
3360
3361 relocation = (plt->output_section->vma
3362 + plt->output_offset + h->plt.offset);
3363
3364 switch (r_type)
3365 {
3366 default:
3367 if (h->root.root.string)
3368 name = h->root.root.string;
3369 else
3370 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3371 NULL);
3372 (*_bfd_error_handler)
3373 (_("%B: relocation %s against STT_GNU_IFUNC "
3374 "symbol `%s' isn't handled by %s"), input_bfd,
3375 elf_howto_table[r_type].name,
3376 name, __FUNCTION__);
3377 bfd_set_error (bfd_error_bad_value);
3378 return FALSE;
3379
3380 case R_386_32:
3381 /* Generate dynamic relcoation only when there is a
3382 non-GOT reference in a shared object. */
3383 if (info->shared && h->non_got_ref)
3384 {
3385 Elf_Internal_Rela outrel;
3386 asection *sreloc;
3387 bfd_vma offset;
3388
3389 /* Need a dynamic relocation to get the real function
3390 adddress. */
3391 offset = _bfd_elf_section_offset (output_bfd,
3392 info,
3393 input_section,
3394 rel->r_offset);
3395 if (offset == (bfd_vma) -1
3396 || offset == (bfd_vma) -2)
3397 abort ();
3398
3399 outrel.r_offset = (input_section->output_section->vma
3400 + input_section->output_offset
3401 + offset);
3402
3403 if (h->dynindx == -1
3404 || h->forced_local
3405 || info->executable)
3406 {
3407 /* This symbol is resolved locally. */
3408 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3409 bfd_put_32 (output_bfd,
3410 (h->root.u.def.value
3411 + h->root.u.def.section->output_section->vma
3412 + h->root.u.def.section->output_offset),
3413 contents + offset);
3414 }
3415 else
3416 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3417
3418 sreloc = htab->elf.irelifunc;
3419 elf_append_rel (output_bfd, sreloc, &outrel);
3420
3421 /* If this reloc is against an external symbol, we
3422 do not want to fiddle with the addend. Otherwise,
3423 we need to include the symbol value so that it
3424 becomes an addend for the dynamic reloc. For an
3425 internal symbol, we have updated addend. */
3426 continue;
3427 }
3428 /* FALLTHROUGH */
3429 case R_386_PC32:
3430 case R_386_PLT32:
3431 goto do_relocation;
3432
3433 case R_386_GOT32:
3434 base_got = htab->elf.sgot;
3435 off = h->got.offset;
3436
3437 if (base_got == NULL)
3438 abort ();
3439
3440 if (off == (bfd_vma) -1)
3441 {
3442 /* We can't use h->got.offset here to save state, or
3443 even just remember the offset, as finish_dynamic_symbol
3444 would use that as offset into .got. */
3445
3446 if (htab->elf.splt != NULL)
3447 {
3448 plt_index = h->plt.offset / plt_entry_size - 1;
3449 off = (plt_index + 3) * 4;
3450 base_got = htab->elf.sgotplt;
3451 }
3452 else
3453 {
3454 plt_index = h->plt.offset / plt_entry_size;
3455 off = plt_index * 4;
3456 base_got = htab->elf.igotplt;
3457 }
3458
3459 if (h->dynindx == -1
3460 || h->forced_local
3461 || info->symbolic)
3462 {
3463 /* This references the local defitionion. We must
3464 initialize this entry in the global offset table.
3465 Since the offset must always be a multiple of 8,
3466 we use the least significant bit to record
3467 whether we have initialized it already.
3468
3469 When doing a dynamic link, we create a .rela.got
3470 relocation entry to initialize the value. This
3471 is done in the finish_dynamic_symbol routine. */
3472 if ((off & 1) != 0)
3473 off &= ~1;
3474 else
3475 {
3476 bfd_put_32 (output_bfd, relocation,
3477 base_got->contents + off);
3478 h->got.offset |= 1;
3479 }
3480 }
3481
3482 relocation = off;
3483
3484 /* Adjust for static executables. */
3485 if (htab->elf.splt == NULL)
3486 relocation += gotplt->output_offset;
3487 }
3488 else
3489 {
3490 relocation = (base_got->output_section->vma
3491 + base_got->output_offset + off
3492 - gotplt->output_section->vma
3493 - gotplt->output_offset);
3494 /* Adjust for static executables. */
3495 if (htab->elf.splt == NULL)
3496 relocation += gotplt->output_offset;
3497 }
3498
3499 goto do_relocation;
3500
3501 case R_386_GOTOFF:
3502 relocation -= (gotplt->output_section->vma
3503 + gotplt->output_offset);
3504 goto do_relocation;
3505 }
3506 }
3507
3508 switch (r_type)
3509 {
3510 case R_386_GOT32:
3511 /* Relocation is to the entry for this symbol in the global
3512 offset table. */
3513 if (htab->elf.sgot == NULL)
3514 abort ();
3515
3516 if (h != NULL)
3517 {
3518 bfd_boolean dyn;
3519
3520 off = h->got.offset;
3521 dyn = htab->elf.dynamic_sections_created;
3522 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3523 || (info->shared
3524 && SYMBOL_REFERENCES_LOCAL (info, h))
3525 || (ELF_ST_VISIBILITY (h->other)
3526 && h->root.type == bfd_link_hash_undefweak))
3527 {
3528 /* This is actually a static link, or it is a
3529 -Bsymbolic link and the symbol is defined
3530 locally, or the symbol was forced to be local
3531 because of a version file. We must initialize
3532 this entry in the global offset table. Since the
3533 offset must always be a multiple of 4, we use the
3534 least significant bit to record whether we have
3535 initialized it already.
3536
3537 When doing a dynamic link, we create a .rel.got
3538 relocation entry to initialize the value. This
3539 is done in the finish_dynamic_symbol routine. */
3540 if ((off & 1) != 0)
3541 off &= ~1;
3542 else
3543 {
3544 bfd_put_32 (output_bfd, relocation,
3545 htab->elf.sgot->contents + off);
3546 h->got.offset |= 1;
3547 }
3548 }
3549 else
3550 unresolved_reloc = FALSE;
3551 }
3552 else
3553 {
3554 if (local_got_offsets == NULL)
3555 abort ();
3556
3557 off = local_got_offsets[r_symndx];
3558
3559 /* The offset must always be a multiple of 4. We use
3560 the least significant bit to record whether we have
3561 already generated the necessary reloc. */
3562 if ((off & 1) != 0)
3563 off &= ~1;
3564 else
3565 {
3566 bfd_put_32 (output_bfd, relocation,
3567 htab->elf.sgot->contents + off);
3568
3569 if (info->shared)
3570 {
3571 asection *s;
3572 Elf_Internal_Rela outrel;
3573
3574 s = htab->elf.srelgot;
3575 if (s == NULL)
3576 abort ();
3577
3578 outrel.r_offset = (htab->elf.sgot->output_section->vma
3579 + htab->elf.sgot->output_offset
3580 + off);
3581 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3582 elf_append_rel (output_bfd, s, &outrel);
3583 }
3584
3585 local_got_offsets[r_symndx] |= 1;
3586 }
3587 }
3588
3589 if (off >= (bfd_vma) -2)
3590 abort ();
3591
3592 relocation = htab->elf.sgot->output_section->vma
3593 + htab->elf.sgot->output_offset + off
3594 - htab->elf.sgotplt->output_section->vma
3595 - htab->elf.sgotplt->output_offset;
3596 break;
3597
3598 case R_386_GOTOFF:
3599 /* Relocation is relative to the start of the global offset
3600 table. */
3601
3602 /* Check to make sure it isn't a protected function symbol
3603 for shared library since it may not be local when used
3604 as function address. We also need to make sure that a
3605 symbol is defined locally. */
3606 if (info->shared && h)
3607 {
3608 if (!h->def_regular)
3609 {
3610 const char *v;
3611
3612 switch (ELF_ST_VISIBILITY (h->other))
3613 {
3614 case STV_HIDDEN:
3615 v = _("hidden symbol");
3616 break;
3617 case STV_INTERNAL:
3618 v = _("internal symbol");
3619 break;
3620 case STV_PROTECTED:
3621 v = _("protected symbol");
3622 break;
3623 default:
3624 v = _("symbol");
3625 break;
3626 }
3627
3628 (*_bfd_error_handler)
3629 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3630 input_bfd, v, h->root.root.string);
3631 bfd_set_error (bfd_error_bad_value);
3632 return FALSE;
3633 }
3634 else if (!info->executable
3635 && !SYMBOLIC_BIND (info, h)
3636 && h->type == STT_FUNC
3637 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3638 {
3639 (*_bfd_error_handler)
3640 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3641 input_bfd, h->root.root.string);
3642 bfd_set_error (bfd_error_bad_value);
3643 return FALSE;
3644 }
3645 }
3646
3647 /* Note that sgot is not involved in this
3648 calculation. We always want the start of .got.plt. If we
3649 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3650 permitted by the ABI, we might have to change this
3651 calculation. */
3652 relocation -= htab->elf.sgotplt->output_section->vma
3653 + htab->elf.sgotplt->output_offset;
3654 break;
3655
3656 case R_386_GOTPC:
3657 /* Use global offset table as symbol value. */
3658 relocation = htab->elf.sgotplt->output_section->vma
3659 + htab->elf.sgotplt->output_offset;
3660 unresolved_reloc = FALSE;
3661 break;
3662
3663 case R_386_PLT32:
3664 /* Relocation is to the entry for this symbol in the
3665 procedure linkage table. */
3666
3667 /* Resolve a PLT32 reloc against a local symbol directly,
3668 without using the procedure linkage table. */
3669 if (h == NULL)
3670 break;
3671
3672 if (h->plt.offset == (bfd_vma) -1
3673 || htab->elf.splt == NULL)
3674 {
3675 /* We didn't make a PLT entry for this symbol. This
3676 happens when statically linking PIC code, or when
3677 using -Bsymbolic. */
3678 break;
3679 }
3680
3681 relocation = (htab->elf.splt->output_section->vma
3682 + htab->elf.splt->output_offset
3683 + h->plt.offset);
3684 unresolved_reloc = FALSE;
3685 break;
3686
3687 case R_386_SIZE32:
3688 /* Set to symbol size. */
3689 relocation = st_size;
3690 /* Fall through. */
3691
3692 case R_386_32:
3693 case R_386_PC32:
3694 if ((input_section->flags & SEC_ALLOC) == 0
3695 || is_vxworks_tls)
3696 break;
3697
3698 if ((info->shared
3699 && (h == NULL
3700 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3701 || h->root.type != bfd_link_hash_undefweak)
3702 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3703 || !SYMBOL_CALLS_LOCAL (info, h)))
3704 || (ELIMINATE_COPY_RELOCS
3705 && !info->shared
3706 && h != NULL
3707 && h->dynindx != -1
3708 && !h->non_got_ref
3709 && ((h->def_dynamic
3710 && !h->def_regular)
3711 || h->root.type == bfd_link_hash_undefweak
3712 || h->root.type == bfd_link_hash_undefined)))
3713 {
3714 Elf_Internal_Rela outrel;
3715 bfd_boolean skip, relocate;
3716 asection *sreloc;
3717
3718 /* When generating a shared object, these relocations
3719 are copied into the output file to be resolved at run
3720 time. */
3721
3722 skip = FALSE;
3723 relocate = FALSE;
3724
3725 outrel.r_offset =
3726 _bfd_elf_section_offset (output_bfd, info, input_section,
3727 rel->r_offset);
3728 if (outrel.r_offset == (bfd_vma) -1)
3729 skip = TRUE;
3730 else if (outrel.r_offset == (bfd_vma) -2)
3731 skip = TRUE, relocate = TRUE;
3732 outrel.r_offset += (input_section->output_section->vma
3733 + input_section->output_offset);
3734
3735 if (skip)
3736 memset (&outrel, 0, sizeof outrel);
3737 else if (h != NULL
3738 && h->dynindx != -1
3739 && (r_type == R_386_PC32
3740 || !info->shared
3741 || !SYMBOLIC_BIND (info, h)
3742 || !h->def_regular))
3743 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3744 else
3745 {
3746 /* This symbol is local, or marked to become local. */
3747 relocate = TRUE;
3748 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3749 }
3750
3751 sreloc = elf_section_data (input_section)->sreloc;
3752
3753 if (sreloc == NULL || sreloc->contents == NULL)
3754 {
3755 r = bfd_reloc_notsupported;
3756 goto check_relocation_error;
3757 }
3758
3759 elf_append_rel (output_bfd, sreloc, &outrel);
3760
3761 /* If this reloc is against an external symbol, we do
3762 not want to fiddle with the addend. Otherwise, we
3763 need to include the symbol value so that it becomes
3764 an addend for the dynamic reloc. */
3765 if (! relocate)
3766 continue;
3767 }
3768 break;
3769
3770 case R_386_TLS_IE:
3771 if (!info->executable)
3772 {
3773 Elf_Internal_Rela outrel;
3774 asection *sreloc;
3775
3776 outrel.r_offset = rel->r_offset
3777 + input_section->output_section->vma
3778 + input_section->output_offset;
3779 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3780 sreloc = elf_section_data (input_section)->sreloc;
3781 if (sreloc == NULL)
3782 abort ();
3783 elf_append_rel (output_bfd, sreloc, &outrel);
3784 }
3785 /* Fall through */
3786
3787 case R_386_TLS_GD:
3788 case R_386_TLS_GOTDESC:
3789 case R_386_TLS_DESC_CALL:
3790 case R_386_TLS_IE_32:
3791 case R_386_TLS_GOTIE:
3792 tls_type = GOT_UNKNOWN;
3793 if (h == NULL && local_got_offsets)
3794 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3795 else if (h != NULL)
3796 tls_type = elf_i386_hash_entry(h)->tls_type;
3797 if (tls_type == GOT_TLS_IE)
3798 tls_type = GOT_TLS_IE_NEG;
3799
3800 if (! elf_i386_tls_transition (info, input_bfd,
3801 input_section, contents,
3802 symtab_hdr, sym_hashes,
3803 &r_type, tls_type, rel,
3804 relend, h, r_symndx))
3805 return FALSE;
3806
3807 if (r_type == R_386_TLS_LE_32)
3808 {
3809 BFD_ASSERT (! unresolved_reloc);
3810 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3811 {
3812 unsigned int type;
3813 bfd_vma roff;
3814
3815 /* GD->LE transition. */
3816 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3817 if (type == 0x04)
3818 {
3819 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3820 Change it into:
3821 movl %gs:0, %eax; subl $foo@tpoff, %eax
3822 (6 byte form of subl). */
3823 memcpy (contents + rel->r_offset - 3,
3824 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3825 roff = rel->r_offset + 5;
3826 }
3827 else
3828 {
3829 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3830 Change it into:
3831 movl %gs:0, %eax; subl $foo@tpoff, %eax
3832 (6 byte form of subl). */
3833 memcpy (contents + rel->r_offset - 2,
3834 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3835 roff = rel->r_offset + 6;
3836 }
3837 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3838 contents + roff);
3839 /* Skip R_386_PC32/R_386_PLT32. */
3840 rel++;
3841 continue;
3842 }
3843 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3844 {
3845 /* GDesc -> LE transition.
3846 It's originally something like:
3847 leal x@tlsdesc(%ebx), %eax
3848
3849 leal x@ntpoff, %eax
3850
3851 Registers other than %eax may be set up here. */
3852
3853 unsigned int val;
3854 bfd_vma roff;
3855
3856 roff = rel->r_offset;
3857 val = bfd_get_8 (input_bfd, contents + roff - 1);
3858
3859 /* Now modify the instruction as appropriate. */
3860 /* aoliva FIXME: remove the above and xor the byte
3861 below with 0x86. */
3862 bfd_put_8 (output_bfd, val ^ 0x86,
3863 contents + roff - 1);
3864 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3865 contents + roff);
3866 continue;
3867 }
3868 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3869 {
3870 /* GDesc -> LE transition.
3871 It's originally:
3872 call *(%eax)
3873 Turn it into:
3874 xchg %ax,%ax */
3875
3876 bfd_vma roff;
3877
3878 roff = rel->r_offset;
3879 bfd_put_8 (output_bfd, 0x66, contents + roff);
3880 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3881 continue;
3882 }
3883 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3884 {
3885 unsigned int val;
3886
3887 /* IE->LE transition:
3888 Originally it can be one of:
3889 movl foo, %eax
3890 movl foo, %reg
3891 addl foo, %reg
3892 We change it into:
3893 movl $foo, %eax
3894 movl $foo, %reg
3895 addl $foo, %reg. */
3896 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3897 if (val == 0xa1)
3898 {
3899 /* movl foo, %eax. */
3900 bfd_put_8 (output_bfd, 0xb8,
3901 contents + rel->r_offset - 1);
3902 }
3903 else
3904 {
3905 unsigned int type;
3906
3907 type = bfd_get_8 (input_bfd,
3908 contents + rel->r_offset - 2);
3909 switch (type)
3910 {
3911 case 0x8b:
3912 /* movl */
3913 bfd_put_8 (output_bfd, 0xc7,
3914 contents + rel->r_offset - 2);
3915 bfd_put_8 (output_bfd,
3916 0xc0 | ((val >> 3) & 7),
3917 contents + rel->r_offset - 1);
3918 break;
3919 case 0x03:
3920 /* addl */
3921 bfd_put_8 (output_bfd, 0x81,
3922 contents + rel->r_offset - 2);
3923 bfd_put_8 (output_bfd,
3924 0xc0 | ((val >> 3) & 7),
3925 contents + rel->r_offset - 1);
3926 break;
3927 default:
3928 BFD_FAIL ();
3929 break;
3930 }
3931 }
3932 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3933 contents + rel->r_offset);
3934 continue;
3935 }
3936 else
3937 {
3938 unsigned int val, type;
3939
3940 /* {IE_32,GOTIE}->LE transition:
3941 Originally it can be one of:
3942 subl foo(%reg1), %reg2
3943 movl foo(%reg1), %reg2
3944 addl foo(%reg1), %reg2
3945 We change it into:
3946 subl $foo, %reg2
3947 movl $foo, %reg2 (6 byte form)
3948 addl $foo, %reg2. */
3949 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3950 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3951 if (type == 0x8b)
3952 {
3953 /* movl */
3954 bfd_put_8 (output_bfd, 0xc7,
3955 contents + rel->r_offset - 2);
3956 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3957 contents + rel->r_offset - 1);
3958 }
3959 else if (type == 0x2b)
3960 {
3961 /* subl */
3962 bfd_put_8 (output_bfd, 0x81,
3963 contents + rel->r_offset - 2);
3964 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3965 contents + rel->r_offset - 1);
3966 }
3967 else if (type == 0x03)
3968 {
3969 /* addl */
3970 bfd_put_8 (output_bfd, 0x81,
3971 contents + rel->r_offset - 2);
3972 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3973 contents + rel->r_offset - 1);
3974 }
3975 else
3976 BFD_FAIL ();
3977 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3978 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3979 contents + rel->r_offset);
3980 else
3981 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3982 contents + rel->r_offset);
3983 continue;
3984 }
3985 }
3986
3987 if (htab->elf.sgot == NULL)
3988 abort ();
3989
3990 if (h != NULL)
3991 {
3992 off = h->got.offset;
3993 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3994 }
3995 else
3996 {
3997 if (local_got_offsets == NULL)
3998 abort ();
3999
4000 off = local_got_offsets[r_symndx];
4001 offplt = local_tlsdesc_gotents[r_symndx];
4002 }
4003
4004 if ((off & 1) != 0)
4005 off &= ~1;
4006 else
4007 {
4008 Elf_Internal_Rela outrel;
4009 int dr_type;
4010 asection *sreloc;
4011
4012 if (htab->elf.srelgot == NULL)
4013 abort ();
4014
4015 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4016
4017 if (GOT_TLS_GDESC_P (tls_type))
4018 {
4019 bfd_byte *loc;
4020 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4021 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4022 <= htab->elf.sgotplt->size);
4023 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4024 + htab->elf.sgotplt->output_offset
4025 + offplt
4026 + htab->sgotplt_jump_table_size);
4027 sreloc = htab->elf.srelplt;
4028 loc = sreloc->contents;
4029 loc += (htab->next_tls_desc_index++
4030 * sizeof (Elf32_External_Rel));
4031 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4032 <= sreloc->contents + sreloc->size);
4033 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4034 if (indx == 0)
4035 {
4036 BFD_ASSERT (! unresolved_reloc);
4037 bfd_put_32 (output_bfd,
4038 relocation - elf_i386_dtpoff_base (info),
4039 htab->elf.sgotplt->contents + offplt
4040 + htab->sgotplt_jump_table_size + 4);
4041 }
4042 else
4043 {
4044 bfd_put_32 (output_bfd, 0,
4045 htab->elf.sgotplt->contents + offplt
4046 + htab->sgotplt_jump_table_size + 4);
4047 }
4048 }
4049
4050 sreloc = htab->elf.srelgot;
4051
4052 outrel.r_offset = (htab->elf.sgot->output_section->vma
4053 + htab->elf.sgot->output_offset + off);
4054
4055 if (GOT_TLS_GD_P (tls_type))
4056 dr_type = R_386_TLS_DTPMOD32;
4057 else if (GOT_TLS_GDESC_P (tls_type))
4058 goto dr_done;
4059 else if (tls_type == GOT_TLS_IE_POS)
4060 dr_type = R_386_TLS_TPOFF;
4061 else
4062 dr_type = R_386_TLS_TPOFF32;
4063
4064 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4065 bfd_put_32 (output_bfd,
4066 relocation - elf_i386_dtpoff_base (info),
4067 htab->elf.sgot->contents + off);
4068 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4069 bfd_put_32 (output_bfd,
4070 elf_i386_dtpoff_base (info) - relocation,
4071 htab->elf.sgot->contents + off);
4072 else if (dr_type != R_386_TLS_DESC)
4073 bfd_put_32 (output_bfd, 0,
4074 htab->elf.sgot->contents + off);
4075 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4076
4077 elf_append_rel (output_bfd, sreloc, &outrel);
4078
4079 if (GOT_TLS_GD_P (tls_type))
4080 {
4081 if (indx == 0)
4082 {
4083 BFD_ASSERT (! unresolved_reloc);
4084 bfd_put_32 (output_bfd,
4085 relocation - elf_i386_dtpoff_base (info),
4086 htab->elf.sgot->contents + off + 4);
4087 }
4088 else
4089 {
4090 bfd_put_32 (output_bfd, 0,
4091 htab->elf.sgot->contents + off + 4);
4092 outrel.r_info = ELF32_R_INFO (indx,
4093 R_386_TLS_DTPOFF32);
4094 outrel.r_offset += 4;
4095 elf_append_rel (output_bfd, sreloc, &outrel);
4096 }
4097 }
4098 else if (tls_type == GOT_TLS_IE_BOTH)
4099 {
4100 bfd_put_32 (output_bfd,
4101 (indx == 0
4102 ? relocation - elf_i386_dtpoff_base (info)
4103 : 0),
4104 htab->elf.sgot->contents + off + 4);
4105 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4106 outrel.r_offset += 4;
4107 elf_append_rel (output_bfd, sreloc, &outrel);
4108 }
4109
4110 dr_done:
4111 if (h != NULL)
4112 h->got.offset |= 1;
4113 else
4114 local_got_offsets[r_symndx] |= 1;
4115 }
4116
4117 if (off >= (bfd_vma) -2
4118 && ! GOT_TLS_GDESC_P (tls_type))
4119 abort ();
4120 if (r_type == R_386_TLS_GOTDESC
4121 || r_type == R_386_TLS_DESC_CALL)
4122 {
4123 relocation = htab->sgotplt_jump_table_size + offplt;
4124 unresolved_reloc = FALSE;
4125 }
4126 else if (r_type == ELF32_R_TYPE (rel->r_info))
4127 {
4128 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4129 + htab->elf.sgotplt->output_offset;
4130 relocation = htab->elf.sgot->output_section->vma
4131 + htab->elf.sgot->output_offset + off - g_o_t;
4132 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4133 && tls_type == GOT_TLS_IE_BOTH)
4134 relocation += 4;
4135 if (r_type == R_386_TLS_IE)
4136 relocation += g_o_t;
4137 unresolved_reloc = FALSE;
4138 }
4139 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4140 {
4141 unsigned int val, type;
4142 bfd_vma roff;
4143
4144 /* GD->IE transition. */
4145 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4146 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4147 if (type == 0x04)
4148 {
4149 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4150 Change it into:
4151 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4152 val >>= 3;
4153 roff = rel->r_offset - 3;
4154 }
4155 else
4156 {
4157 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4158 Change it into:
4159 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4160 roff = rel->r_offset - 2;
4161 }
4162 memcpy (contents + roff,
4163 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4164 contents[roff + 7] = 0x80 | (val & 7);
4165 /* If foo is used only with foo@gotntpoff(%reg) and
4166 foo@indntpoff, but not with foo@gottpoff(%reg), change
4167 subl $foo@gottpoff(%reg), %eax
4168 into:
4169 addl $foo@gotntpoff(%reg), %eax. */
4170 if (tls_type == GOT_TLS_IE_POS)
4171 contents[roff + 6] = 0x03;
4172 bfd_put_32 (output_bfd,
4173 htab->elf.sgot->output_section->vma
4174 + htab->elf.sgot->output_offset + off
4175 - htab->elf.sgotplt->output_section->vma
4176 - htab->elf.sgotplt->output_offset,
4177 contents + roff + 8);
4178 /* Skip R_386_PLT32. */
4179 rel++;
4180 continue;
4181 }
4182 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4183 {
4184 /* GDesc -> IE transition.
4185 It's originally something like:
4186 leal x@tlsdesc(%ebx), %eax
4187
4188 Change it to:
4189 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4190 or:
4191 movl x@gottpoff(%ebx), %eax # before negl %eax
4192
4193 Registers other than %eax may be set up here. */
4194
4195 bfd_vma roff;
4196
4197 /* First, make sure it's a leal adding ebx to a 32-bit
4198 offset into any register, although it's probably
4199 almost always going to be eax. */
4200 roff = rel->r_offset;
4201
4202 /* Now modify the instruction as appropriate. */
4203 /* To turn a leal into a movl in the form we use it, it
4204 suffices to change the first byte from 0x8d to 0x8b.
4205 aoliva FIXME: should we decide to keep the leal, all
4206 we have to do is remove the statement below, and
4207 adjust the relaxation of R_386_TLS_DESC_CALL. */
4208 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4209
4210 if (tls_type == GOT_TLS_IE_BOTH)
4211 off += 4;
4212
4213 bfd_put_32 (output_bfd,
4214 htab->elf.sgot->output_section->vma
4215 + htab->elf.sgot->output_offset + off
4216 - htab->elf.sgotplt->output_section->vma
4217 - htab->elf.sgotplt->output_offset,
4218 contents + roff);
4219 continue;
4220 }
4221 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4222 {
4223 /* GDesc -> IE transition.
4224 It's originally:
4225 call *(%eax)
4226
4227 Change it to:
4228 xchg %ax,%ax
4229 or
4230 negl %eax
4231 depending on how we transformed the TLS_GOTDESC above.
4232 */
4233
4234 bfd_vma roff;
4235
4236 roff = rel->r_offset;
4237
4238 /* Now modify the instruction as appropriate. */
4239 if (tls_type != GOT_TLS_IE_NEG)
4240 {
4241 /* xchg %ax,%ax */
4242 bfd_put_8 (output_bfd, 0x66, contents + roff);
4243 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4244 }
4245 else
4246 {
4247 /* negl %eax */
4248 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4249 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4250 }
4251
4252 continue;
4253 }
4254 else
4255 BFD_ASSERT (FALSE);
4256 break;
4257
4258 case R_386_TLS_LDM:
4259 if (! elf_i386_tls_transition (info, input_bfd,
4260 input_section, contents,
4261 symtab_hdr, sym_hashes,
4262 &r_type, GOT_UNKNOWN, rel,
4263 relend, h, r_symndx))
4264 return FALSE;
4265
4266 if (r_type != R_386_TLS_LDM)
4267 {
4268 /* LD->LE transition:
4269 leal foo(%reg), %eax; call ___tls_get_addr.
4270 We change it into:
4271 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4272 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4273 memcpy (contents + rel->r_offset - 2,
4274 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4275 /* Skip R_386_PC32/R_386_PLT32. */
4276 rel++;
4277 continue;
4278 }
4279
4280 if (htab->elf.sgot == NULL)
4281 abort ();
4282
4283 off = htab->tls_ldm_got.offset;
4284 if (off & 1)
4285 off &= ~1;
4286 else
4287 {
4288 Elf_Internal_Rela outrel;
4289
4290 if (htab->elf.srelgot == NULL)
4291 abort ();
4292
4293 outrel.r_offset = (htab->elf.sgot->output_section->vma
4294 + htab->elf.sgot->output_offset + off);
4295
4296 bfd_put_32 (output_bfd, 0,
4297 htab->elf.sgot->contents + off);
4298 bfd_put_32 (output_bfd, 0,
4299 htab->elf.sgot->contents + off + 4);
4300 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4301 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4302 htab->tls_ldm_got.offset |= 1;
4303 }
4304 relocation = htab->elf.sgot->output_section->vma
4305 + htab->elf.sgot->output_offset + off
4306 - htab->elf.sgotplt->output_section->vma
4307 - htab->elf.sgotplt->output_offset;
4308 unresolved_reloc = FALSE;
4309 break;
4310
4311 case R_386_TLS_LDO_32:
4312 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4313 relocation -= elf_i386_dtpoff_base (info);
4314 else
4315 /* When converting LDO to LE, we must negate. */
4316 relocation = -elf_i386_tpoff (info, relocation);
4317 break;
4318
4319 case R_386_TLS_LE_32:
4320 case R_386_TLS_LE:
4321 if (!info->executable)
4322 {
4323 Elf_Internal_Rela outrel;
4324 asection *sreloc;
4325
4326 outrel.r_offset = rel->r_offset
4327 + input_section->output_section->vma
4328 + input_section->output_offset;
4329 if (h != NULL && h->dynindx != -1)
4330 indx = h->dynindx;
4331 else
4332 indx = 0;
4333 if (r_type == R_386_TLS_LE_32)
4334 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4335 else
4336 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4337 sreloc = elf_section_data (input_section)->sreloc;
4338 if (sreloc == NULL)
4339 abort ();
4340 elf_append_rel (output_bfd, sreloc, &outrel);
4341 if (indx)
4342 continue;
4343 else if (r_type == R_386_TLS_LE_32)
4344 relocation = elf_i386_dtpoff_base (info) - relocation;
4345 else
4346 relocation -= elf_i386_dtpoff_base (info);
4347 }
4348 else if (r_type == R_386_TLS_LE_32)
4349 relocation = elf_i386_tpoff (info, relocation);
4350 else
4351 relocation = -elf_i386_tpoff (info, relocation);
4352 break;
4353
4354 default:
4355 break;
4356 }
4357
4358 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4359 because such sections are not SEC_ALLOC and thus ld.so will
4360 not process them. */
4361 if (unresolved_reloc
4362 && !((input_section->flags & SEC_DEBUGGING) != 0
4363 && h->def_dynamic)
4364 && _bfd_elf_section_offset (output_bfd, info, input_section,
4365 rel->r_offset) != (bfd_vma) -1)
4366 {
4367 (*_bfd_error_handler)
4368 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4369 input_bfd,
4370 input_section,
4371 (long) rel->r_offset,
4372 howto->name,
4373 h->root.root.string);
4374 return FALSE;
4375 }
4376
4377 do_relocation:
4378 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4379 contents, rel->r_offset,
4380 relocation, 0);
4381
4382 check_relocation_error:
4383 if (r != bfd_reloc_ok)
4384 {
4385 const char *name;
4386
4387 if (h != NULL)
4388 name = h->root.root.string;
4389 else
4390 {
4391 name = bfd_elf_string_from_elf_section (input_bfd,
4392 symtab_hdr->sh_link,
4393 sym->st_name);
4394 if (name == NULL)
4395 return FALSE;
4396 if (*name == '\0')
4397 name = bfd_section_name (input_bfd, sec);
4398 }
4399
4400 if (r == bfd_reloc_overflow)
4401 {
4402 if (! ((*info->callbacks->reloc_overflow)
4403 (info, (h ? &h->root : NULL), name, howto->name,
4404 (bfd_vma) 0, input_bfd, input_section,
4405 rel->r_offset)))
4406 return FALSE;
4407 }
4408 else
4409 {
4410 (*_bfd_error_handler)
4411 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4412 input_bfd, input_section,
4413 (long) rel->r_offset, name, (int) r);
4414 return FALSE;
4415 }
4416 }
4417 }
4418
4419 return TRUE;
4420 }
4421
4422 /* Finish up dynamic symbol handling. We set the contents of various
4423 dynamic sections here. */
4424
4425 static bfd_boolean
4426 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4427 struct bfd_link_info *info,
4428 struct elf_link_hash_entry *h,
4429 Elf_Internal_Sym *sym)
4430 {
4431 struct elf_i386_link_hash_table *htab;
4432 unsigned plt_entry_size;
4433 const struct elf_i386_backend_data *abed;
4434
4435 htab = elf_i386_hash_table (info);
4436 if (htab == NULL)
4437 return FALSE;
4438
4439 abed = get_elf_i386_backend_data (output_bfd);
4440 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4441
4442 if (h->plt.offset != (bfd_vma) -1)
4443 {
4444 bfd_vma plt_index;
4445 bfd_vma got_offset;
4446 Elf_Internal_Rela rel;
4447 bfd_byte *loc;
4448 asection *plt, *gotplt, *relplt;
4449
4450 /* When building a static executable, use .iplt, .igot.plt and
4451 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4452 if (htab->elf.splt != NULL)
4453 {
4454 plt = htab->elf.splt;
4455 gotplt = htab->elf.sgotplt;
4456 relplt = htab->elf.srelplt;
4457 }
4458 else
4459 {
4460 plt = htab->elf.iplt;
4461 gotplt = htab->elf.igotplt;
4462 relplt = htab->elf.irelplt;
4463 }
4464
4465 /* This symbol has an entry in the procedure linkage table. Set
4466 it up. */
4467
4468 if ((h->dynindx == -1
4469 && !((h->forced_local || info->executable)
4470 && h->def_regular
4471 && h->type == STT_GNU_IFUNC))
4472 || plt == NULL
4473 || gotplt == NULL
4474 || relplt == NULL)
4475 abort ();
4476
4477 /* Get the index in the procedure linkage table which
4478 corresponds to this symbol. This is the index of this symbol
4479 in all the symbols for which we are making plt entries. The
4480 first entry in the procedure linkage table is reserved.
4481
4482 Get the offset into the .got table of the entry that
4483 corresponds to this function. Each .got entry is 4 bytes.
4484 The first three are reserved.
4485
4486 For static executables, we don't reserve anything. */
4487
4488 if (plt == htab->elf.splt)
4489 {
4490 got_offset = h->plt.offset / plt_entry_size - 1;
4491 got_offset = (got_offset + 3) * 4;
4492 }
4493 else
4494 {
4495 got_offset = h->plt.offset / plt_entry_size;
4496 got_offset = got_offset * 4;
4497 }
4498
4499 /* Fill in the entry in the procedure linkage table. */
4500 if (! info->shared)
4501 {
4502 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4503 abed->plt->plt_entry_size);
4504 bfd_put_32 (output_bfd,
4505 (gotplt->output_section->vma
4506 + gotplt->output_offset
4507 + got_offset),
4508 plt->contents + h->plt.offset
4509 + abed->plt->plt_got_offset);
4510
4511 if (abed->is_vxworks)
4512 {
4513 int s, k, reloc_index;
4514
4515 /* Create the R_386_32 relocation referencing the GOT
4516 for this PLT entry. */
4517
4518 /* S: Current slot number (zero-based). */
4519 s = ((h->plt.offset - abed->plt->plt_entry_size)
4520 / abed->plt->plt_entry_size);
4521 /* K: Number of relocations for PLTResolve. */
4522 if (info->shared)
4523 k = PLTRESOLVE_RELOCS_SHLIB;
4524 else
4525 k = PLTRESOLVE_RELOCS;
4526 /* Skip the PLTresolve relocations, and the relocations for
4527 the other PLT slots. */
4528 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4529 loc = (htab->srelplt2->contents + reloc_index
4530 * sizeof (Elf32_External_Rel));
4531
4532 rel.r_offset = (htab->elf.splt->output_section->vma
4533 + htab->elf.splt->output_offset
4534 + h->plt.offset + 2),
4535 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4536 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4537
4538 /* Create the R_386_32 relocation referencing the beginning of
4539 the PLT for this GOT entry. */
4540 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4541 + htab->elf.sgotplt->output_offset
4542 + got_offset);
4543 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4544 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4545 loc + sizeof (Elf32_External_Rel));
4546 }
4547 }
4548 else
4549 {
4550 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4551 abed->plt->plt_entry_size);
4552 bfd_put_32 (output_bfd, got_offset,
4553 plt->contents + h->plt.offset
4554 + abed->plt->plt_got_offset);
4555 }
4556
4557 /* Fill in the entry in the global offset table. */
4558 bfd_put_32 (output_bfd,
4559 (plt->output_section->vma
4560 + plt->output_offset
4561 + h->plt.offset
4562 + abed->plt->plt_lazy_offset),
4563 gotplt->contents + got_offset);
4564
4565 /* Fill in the entry in the .rel.plt section. */
4566 rel.r_offset = (gotplt->output_section->vma
4567 + gotplt->output_offset
4568 + got_offset);
4569 if (h->dynindx == -1
4570 || ((info->executable
4571 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4572 && h->def_regular
4573 && h->type == STT_GNU_IFUNC))
4574 {
4575 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4576 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4577 in the .got.plt section. */
4578 bfd_put_32 (output_bfd,
4579 (h->root.u.def.value
4580 + h->root.u.def.section->output_section->vma
4581 + h->root.u.def.section->output_offset),
4582 gotplt->contents + got_offset);
4583 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4584 /* R_386_IRELATIVE comes last. */
4585 plt_index = htab->next_irelative_index--;
4586 }
4587 else
4588 {
4589 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4590 plt_index = htab->next_jump_slot_index++;
4591 }
4592 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4593 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4594
4595 /* Don't fill PLT entry for static executables. */
4596 if (plt == htab->elf.splt)
4597 {
4598 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4599 plt->contents + h->plt.offset
4600 + abed->plt->plt_reloc_offset);
4601 bfd_put_32 (output_bfd, - (h->plt.offset
4602 + abed->plt->plt_plt_offset + 4),
4603 plt->contents + h->plt.offset
4604 + abed->plt->plt_plt_offset);
4605 }
4606
4607 if (!h->def_regular)
4608 {
4609 /* Mark the symbol as undefined, rather than as defined in
4610 the .plt section. Leave the value if there were any
4611 relocations where pointer equality matters (this is a clue
4612 for the dynamic linker, to make function pointer
4613 comparisons work between an application and shared
4614 library), otherwise set it to zero. If a function is only
4615 called from a binary, there is no need to slow down
4616 shared libraries because of that. */
4617 sym->st_shndx = SHN_UNDEF;
4618 if (!h->pointer_equality_needed)
4619 sym->st_value = 0;
4620 }
4621 }
4622
4623 if (h->got.offset != (bfd_vma) -1
4624 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4625 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4626 {
4627 Elf_Internal_Rela rel;
4628
4629 /* This symbol has an entry in the global offset table. Set it
4630 up. */
4631
4632 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4633 abort ();
4634
4635 rel.r_offset = (htab->elf.sgot->output_section->vma
4636 + htab->elf.sgot->output_offset
4637 + (h->got.offset & ~(bfd_vma) 1));
4638
4639 /* If this is a static link, or it is a -Bsymbolic link and the
4640 symbol is defined locally or was forced to be local because
4641 of a version file, we just want to emit a RELATIVE reloc.
4642 The entry in the global offset table will already have been
4643 initialized in the relocate_section function. */
4644 if (h->def_regular
4645 && h->type == STT_GNU_IFUNC)
4646 {
4647 if (info->shared)
4648 {
4649 /* Generate R_386_GLOB_DAT. */
4650 goto do_glob_dat;
4651 }
4652 else
4653 {
4654 asection *plt;
4655
4656 if (!h->pointer_equality_needed)
4657 abort ();
4658
4659 /* For non-shared object, we can't use .got.plt, which
4660 contains the real function addres if we need pointer
4661 equality. We load the GOT entry with the PLT entry. */
4662 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4663 bfd_put_32 (output_bfd,
4664 (plt->output_section->vma
4665 + plt->output_offset + h->plt.offset),
4666 htab->elf.sgot->contents + h->got.offset);
4667 return TRUE;
4668 }
4669 }
4670 else if (info->shared
4671 && SYMBOL_REFERENCES_LOCAL (info, h))
4672 {
4673 BFD_ASSERT((h->got.offset & 1) != 0);
4674 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4675 }
4676 else
4677 {
4678 BFD_ASSERT((h->got.offset & 1) == 0);
4679 do_glob_dat:
4680 bfd_put_32 (output_bfd, (bfd_vma) 0,
4681 htab->elf.sgot->contents + h->got.offset);
4682 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4683 }
4684
4685 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4686 }
4687
4688 if (h->needs_copy)
4689 {
4690 Elf_Internal_Rela rel;
4691
4692 /* This symbol needs a copy reloc. Set it up. */
4693
4694 if (h->dynindx == -1
4695 || (h->root.type != bfd_link_hash_defined
4696 && h->root.type != bfd_link_hash_defweak)
4697 || htab->srelbss == NULL)
4698 abort ();
4699
4700 rel.r_offset = (h->root.u.def.value
4701 + h->root.u.def.section->output_section->vma
4702 + h->root.u.def.section->output_offset);
4703 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4704 elf_append_rel (output_bfd, htab->srelbss, &rel);
4705 }
4706
4707 return TRUE;
4708 }
4709
4710 /* Finish up local dynamic symbol handling. We set the contents of
4711 various dynamic sections here. */
4712
4713 static bfd_boolean
4714 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4715 {
4716 struct elf_link_hash_entry *h
4717 = (struct elf_link_hash_entry *) *slot;
4718 struct bfd_link_info *info
4719 = (struct bfd_link_info *) inf;
4720
4721 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4722 h, NULL);
4723 }
4724
4725 /* Used to decide how to sort relocs in an optimal manner for the
4726 dynamic linker, before writing them out. */
4727
4728 static enum elf_reloc_type_class
4729 elf_i386_reloc_type_class (const struct bfd_link_info *info ATTRIBUTE_UNUSED,
4730 const asection *rel_sec ATTRIBUTE_UNUSED,
4731 const Elf_Internal_Rela *rela)
4732 {
4733 switch (ELF32_R_TYPE (rela->r_info))
4734 {
4735 case R_386_RELATIVE:
4736 return reloc_class_relative;
4737 case R_386_JUMP_SLOT:
4738 return reloc_class_plt;
4739 case R_386_COPY:
4740 return reloc_class_copy;
4741 default:
4742 return reloc_class_normal;
4743 }
4744 }
4745
4746 /* Finish up the dynamic sections. */
4747
4748 static bfd_boolean
4749 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4750 struct bfd_link_info *info)
4751 {
4752 struct elf_i386_link_hash_table *htab;
4753 bfd *dynobj;
4754 asection *sdyn;
4755 const struct elf_i386_backend_data *abed;
4756
4757 htab = elf_i386_hash_table (info);
4758 if (htab == NULL)
4759 return FALSE;
4760
4761 dynobj = htab->elf.dynobj;
4762 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4763 abed = get_elf_i386_backend_data (output_bfd);
4764
4765 if (htab->elf.dynamic_sections_created)
4766 {
4767 Elf32_External_Dyn *dyncon, *dynconend;
4768
4769 if (sdyn == NULL || htab->elf.sgot == NULL)
4770 abort ();
4771
4772 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4773 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4774 for (; dyncon < dynconend; dyncon++)
4775 {
4776 Elf_Internal_Dyn dyn;
4777 asection *s;
4778
4779 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4780
4781 switch (dyn.d_tag)
4782 {
4783 default:
4784 if (abed->is_vxworks
4785 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4786 break;
4787 continue;
4788
4789 case DT_PLTGOT:
4790 s = htab->elf.sgotplt;
4791 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4792 break;
4793
4794 case DT_JMPREL:
4795 s = htab->elf.srelplt;
4796 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4797 break;
4798
4799 case DT_PLTRELSZ:
4800 s = htab->elf.srelplt;
4801 dyn.d_un.d_val = s->size;
4802 break;
4803
4804 case DT_RELSZ:
4805 /* My reading of the SVR4 ABI indicates that the
4806 procedure linkage table relocs (DT_JMPREL) should be
4807 included in the overall relocs (DT_REL). This is
4808 what Solaris does. However, UnixWare can not handle
4809 that case. Therefore, we override the DT_RELSZ entry
4810 here to make it not include the JMPREL relocs. */
4811 s = htab->elf.srelplt;
4812 if (s == NULL)
4813 continue;
4814 dyn.d_un.d_val -= s->size;
4815 break;
4816
4817 case DT_REL:
4818 /* We may not be using the standard ELF linker script.
4819 If .rel.plt is the first .rel section, we adjust
4820 DT_REL to not include it. */
4821 s = htab->elf.srelplt;
4822 if (s == NULL)
4823 continue;
4824 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4825 continue;
4826 dyn.d_un.d_ptr += s->size;
4827 break;
4828 }
4829
4830 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4831 }
4832
4833 /* Fill in the first entry in the procedure linkage table. */
4834 if (htab->elf.splt && htab->elf.splt->size > 0)
4835 {
4836 if (info->shared)
4837 {
4838 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4839 abed->plt->plt0_entry_size);
4840 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4841 abed->plt0_pad_byte,
4842 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4843 }
4844 else
4845 {
4846 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4847 abed->plt->plt0_entry_size);
4848 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4849 abed->plt0_pad_byte,
4850 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4851 bfd_put_32 (output_bfd,
4852 (htab->elf.sgotplt->output_section->vma
4853 + htab->elf.sgotplt->output_offset
4854 + 4),
4855 htab->elf.splt->contents
4856 + abed->plt->plt0_got1_offset);
4857 bfd_put_32 (output_bfd,
4858 (htab->elf.sgotplt->output_section->vma
4859 + htab->elf.sgotplt->output_offset
4860 + 8),
4861 htab->elf.splt->contents
4862 + abed->plt->plt0_got2_offset);
4863
4864 if (abed->is_vxworks)
4865 {
4866 Elf_Internal_Rela rel;
4867
4868 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4869 On IA32 we use REL relocations so the addend goes in
4870 the PLT directly. */
4871 rel.r_offset = (htab->elf.splt->output_section->vma
4872 + htab->elf.splt->output_offset
4873 + abed->plt->plt0_got1_offset);
4874 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4875 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4876 htab->srelplt2->contents);
4877 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4878 rel.r_offset = (htab->elf.splt->output_section->vma
4879 + htab->elf.splt->output_offset
4880 + abed->plt->plt0_got2_offset);
4881 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4882 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4883 htab->srelplt2->contents +
4884 sizeof (Elf32_External_Rel));
4885 }
4886 }
4887
4888 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4889 really seem like the right value. */
4890 elf_section_data (htab->elf.splt->output_section)
4891 ->this_hdr.sh_entsize = 4;
4892
4893 /* Correct the .rel.plt.unloaded relocations. */
4894 if (abed->is_vxworks && !info->shared)
4895 {
4896 int num_plts = (htab->elf.splt->size
4897 / abed->plt->plt_entry_size) - 1;
4898 unsigned char *p;
4899
4900 p = htab->srelplt2->contents;
4901 if (info->shared)
4902 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4903 else
4904 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4905
4906 for (; num_plts; num_plts--)
4907 {
4908 Elf_Internal_Rela rel;
4909 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4910 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4911 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4912 p += sizeof (Elf32_External_Rel);
4913
4914 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4915 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4916 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4917 p += sizeof (Elf32_External_Rel);
4918 }
4919 }
4920 }
4921 }
4922
4923 if (htab->elf.sgotplt)
4924 {
4925 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4926 {
4927 (*_bfd_error_handler)
4928 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4929 return FALSE;
4930 }
4931
4932 /* Fill in the first three entries in the global offset table. */
4933 if (htab->elf.sgotplt->size > 0)
4934 {
4935 bfd_put_32 (output_bfd,
4936 (sdyn == NULL ? 0
4937 : sdyn->output_section->vma + sdyn->output_offset),
4938 htab->elf.sgotplt->contents);
4939 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4940 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4941 }
4942
4943 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4944 }
4945
4946 /* Adjust .eh_frame for .plt section. */
4947 if (htab->plt_eh_frame != NULL
4948 && htab->plt_eh_frame->contents != NULL)
4949 {
4950 if (htab->elf.splt != NULL
4951 && htab->elf.splt->size != 0
4952 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4953 && htab->elf.splt->output_section != NULL
4954 && htab->plt_eh_frame->output_section != NULL)
4955 {
4956 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4957 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4958 + htab->plt_eh_frame->output_offset
4959 + PLT_FDE_START_OFFSET;
4960 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4961 htab->plt_eh_frame->contents
4962 + PLT_FDE_START_OFFSET);
4963 }
4964 if (htab->plt_eh_frame->sec_info_type
4965 == SEC_INFO_TYPE_EH_FRAME)
4966 {
4967 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4968 htab->plt_eh_frame,
4969 htab->plt_eh_frame->contents))
4970 return FALSE;
4971 }
4972 }
4973
4974 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4975 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4976
4977 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4978 htab_traverse (htab->loc_hash_table,
4979 elf_i386_finish_local_dynamic_symbol,
4980 info);
4981
4982 return TRUE;
4983 }
4984
4985 /* Return address for Ith PLT stub in section PLT, for relocation REL
4986 or (bfd_vma) -1 if it should not be included. */
4987
4988 static bfd_vma
4989 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4990 const arelent *rel ATTRIBUTE_UNUSED)
4991 {
4992 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
4993 }
4994
4995 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4996
4997 static bfd_boolean
4998 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4999 {
5000 if (h->plt.offset != (bfd_vma) -1
5001 && !h->def_regular
5002 && !h->pointer_equality_needed)
5003 return FALSE;
5004
5005 return _bfd_elf_hash_symbol (h);
5006 }
5007
5008 /* Hook called by the linker routine which adds symbols from an object
5009 file. */
5010
5011 static bfd_boolean
5012 elf_i386_add_symbol_hook (bfd * abfd,
5013 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5014 Elf_Internal_Sym * sym,
5015 const char ** namep ATTRIBUTE_UNUSED,
5016 flagword * flagsp ATTRIBUTE_UNUSED,
5017 asection ** secp ATTRIBUTE_UNUSED,
5018 bfd_vma * valp ATTRIBUTE_UNUSED)
5019 {
5020 if ((abfd->flags & DYNAMIC) == 0
5021 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5022 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5023 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5024
5025 return TRUE;
5026 }
5027
5028 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5029 #define TARGET_LITTLE_NAME "elf32-i386"
5030 #define ELF_ARCH bfd_arch_i386
5031 #define ELF_TARGET_ID I386_ELF_DATA
5032 #define ELF_MACHINE_CODE EM_386
5033 #define ELF_MAXPAGESIZE 0x1000
5034
5035 #define elf_backend_can_gc_sections 1
5036 #define elf_backend_can_refcount 1
5037 #define elf_backend_want_got_plt 1
5038 #define elf_backend_plt_readonly 1
5039 #define elf_backend_want_plt_sym 0
5040 #define elf_backend_got_header_size 12
5041 #define elf_backend_plt_alignment 4
5042
5043 /* Support RELA for objdump of prelink objects. */
5044 #define elf_info_to_howto elf_i386_info_to_howto_rel
5045 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5046
5047 #define bfd_elf32_mkobject elf_i386_mkobject
5048
5049 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5050 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5051 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5052 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5053 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5054
5055 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5056 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5057 #define elf_backend_check_relocs elf_i386_check_relocs
5058 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5059 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5060 #define elf_backend_fake_sections elf_i386_fake_sections
5061 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5062 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5063 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5064 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5065 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5066 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5067 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5068 #define elf_backend_relocate_section elf_i386_relocate_section
5069 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5070 #define elf_backend_always_size_sections elf_i386_always_size_sections
5071 #define elf_backend_omit_section_dynsym \
5072 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5073 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5074 #define elf_backend_hash_symbol elf_i386_hash_symbol
5075 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5076
5077 #include "elf32-target.h"
5078
5079 /* FreeBSD support. */
5080
5081 #undef TARGET_LITTLE_SYM
5082 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5083 #undef TARGET_LITTLE_NAME
5084 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5085 #undef ELF_OSABI
5086 #define ELF_OSABI ELFOSABI_FREEBSD
5087
5088 /* The kernel recognizes executables as valid only if they carry a
5089 "FreeBSD" label in the ELF header. So we put this label on all
5090 executables and (for simplicity) also all other object files. */
5091
5092 static void
5093 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5094 {
5095 _bfd_elf_post_process_headers (abfd, info);
5096
5097 #ifdef OLD_FREEBSD_ABI_LABEL
5098 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5099 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5100 #endif
5101 }
5102
5103 #undef elf_backend_post_process_headers
5104 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5105 #undef elf32_bed
5106 #define elf32_bed elf32_i386_fbsd_bed
5107
5108 #undef elf_backend_add_symbol_hook
5109
5110 #include "elf32-target.h"
5111
5112 /* Solaris 2. */
5113
5114 #undef TARGET_LITTLE_SYM
5115 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5116 #undef TARGET_LITTLE_NAME
5117 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5118
5119 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5120 objects won't be recognized. */
5121 #undef ELF_OSABI
5122
5123 #undef elf32_bed
5124 #define elf32_bed elf32_i386_sol2_bed
5125
5126 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5127 boundary. */
5128 #undef elf_backend_static_tls_alignment
5129 #define elf_backend_static_tls_alignment 8
5130
5131 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5132
5133 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5134 File, p.63. */
5135 #undef elf_backend_want_plt_sym
5136 #define elf_backend_want_plt_sym 1
5137
5138 #include "elf32-target.h"
5139
5140 /* Native Client support. */
5141
5142 #undef TARGET_LITTLE_SYM
5143 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5144 #undef TARGET_LITTLE_NAME
5145 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5146 #undef elf32_bed
5147 #define elf32_bed elf32_i386_nacl_bed
5148
5149 #undef ELF_MAXPAGESIZE
5150 #define ELF_MAXPAGESIZE 0x10000
5151
5152 /* Restore defaults. */
5153 #undef ELF_OSABI
5154 #undef elf_backend_want_plt_sym
5155 #define elf_backend_want_plt_sym 0
5156 #undef elf_backend_post_process_headers
5157 #undef elf_backend_static_tls_alignment
5158
5159 /* NaCl uses substantially different PLT entries for the same effects. */
5160
5161 #undef elf_backend_plt_alignment
5162 #define elf_backend_plt_alignment 5
5163 #define NACL_PLT_ENTRY_SIZE 64
5164 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5165
5166 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5167 {
5168 0xff, 0x35, /* pushl contents of address */
5169 0, 0, 0, 0, /* replaced with address of .got + 4. */
5170 0x8b, 0x0d, /* movl contents of address, %ecx */
5171 0, 0, 0, 0, /* replaced with address of .got + 8. */
5172 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5173 0xff, 0xe1 /* jmp *%ecx */
5174 };
5175
5176 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5177 {
5178 0x8b, 0x0d, /* movl contents of address, %ecx */
5179 0, 0, 0, 0, /* replaced with GOT slot address. */
5180 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5181 0xff, 0xe1, /* jmp *%ecx */
5182
5183 /* Pad to the next 32-byte boundary with nop instructions. */
5184 0x90,
5185 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5186 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5187
5188 /* Lazy GOT entries point here (32-byte aligned). */
5189 0x68, /* pushl immediate */
5190 0, 0, 0, 0, /* replaced with reloc offset. */
5191 0xe9, /* jmp relative */
5192 0, 0, 0, 0, /* replaced with offset to .plt. */
5193
5194 /* Pad to the next 32-byte boundary with nop instructions. */
5195 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5196 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5197 0x90, 0x90
5198 };
5199
5200 static const bfd_byte
5201 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5202 {
5203 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5204 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5205 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5206 0xff, 0xe1, /* jmp *%ecx */
5207
5208 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5209 so pad to that size with nop instructions. */
5210 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5211 };
5212
5213 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5214 {
5215 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5216 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5217 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5218 0xff, 0xe1, /* jmp *%ecx */
5219
5220 /* Pad to the next 32-byte boundary with nop instructions. */
5221 0x90,
5222 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5223 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5224
5225 /* Lazy GOT entries point here (32-byte aligned). */
5226 0x68, /* pushl immediate */
5227 0, 0, 0, 0, /* replaced with offset into relocation table. */
5228 0xe9, /* jmp relative */
5229 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5230
5231 /* Pad to the next 32-byte boundary with nop instructions. */
5232 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5233 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5234 0x90, 0x90
5235 };
5236
5237 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5238 {
5239 #if (PLT_CIE_LENGTH != 20 \
5240 || PLT_FDE_LENGTH != 36 \
5241 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5242 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5243 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5244 #endif
5245 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5246 0, 0, 0, 0, /* CIE ID */
5247 1, /* CIE version */
5248 'z', 'R', 0, /* Augmentation string */
5249 1, /* Code alignment factor */
5250 0x7c, /* Data alignment factor: -4 */
5251 8, /* Return address column */
5252 1, /* Augmentation size */
5253 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5254 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5255 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5256 DW_CFA_nop, DW_CFA_nop,
5257
5258 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5259 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5260 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5261 0, 0, 0, 0, /* .plt size goes here */
5262 0, /* Augmentation size */
5263 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5264 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5265 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5266 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5267 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5268 13, /* Block length */
5269 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5270 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5271 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5272 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5273 DW_CFA_nop, DW_CFA_nop
5274 };
5275
5276 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5277 {
5278 elf_i386_nacl_plt0_entry, /* plt0_entry */
5279 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5280 2, /* plt0_got1_offset */
5281 8, /* plt0_got2_offset */
5282 elf_i386_nacl_plt_entry, /* plt_entry */
5283 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5284 2, /* plt_got_offset */
5285 33, /* plt_reloc_offset */
5286 38, /* plt_plt_offset */
5287 32, /* plt_lazy_offset */
5288 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5289 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5290 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5291 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5292 };
5293
5294 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5295 {
5296 &elf_i386_nacl_plt, /* plt */
5297 0x90, /* plt0_pad_byte: nop insn */
5298 0, /* is_vxworks */
5299 };
5300
5301 static bfd_boolean
5302 elf32_i386_nacl_elf_object_p (bfd *abfd)
5303 {
5304 /* Set the right machine number for a NaCl i386 ELF32 file. */
5305 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5306 return TRUE;
5307 }
5308
5309 #undef elf_backend_arch_data
5310 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5311
5312 #undef elf_backend_object_p
5313 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5314 #undef elf_backend_modify_segment_map
5315 #define elf_backend_modify_segment_map nacl_modify_segment_map
5316 #undef elf_backend_modify_program_headers
5317 #define elf_backend_modify_program_headers nacl_modify_program_headers
5318 #undef elf_backend_final_write_processing
5319 #define elf_backend_final_write_processing nacl_final_write_processing
5320
5321 #include "elf32-target.h"
5322
5323 /* Restore defaults. */
5324 #undef elf_backend_object_p
5325 #undef elf_backend_modify_segment_map
5326 #undef elf_backend_modify_program_headers
5327 #undef elf_backend_final_write_processing
5328
5329 /* VxWorks support. */
5330
5331 #undef TARGET_LITTLE_SYM
5332 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5333 #undef TARGET_LITTLE_NAME
5334 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5335 #undef ELF_OSABI
5336 #undef elf_backend_plt_alignment
5337 #define elf_backend_plt_alignment 4
5338
5339 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5340 {
5341 &elf_i386_plt, /* plt */
5342 0x90, /* plt0_pad_byte */
5343 1, /* is_vxworks */
5344 };
5345
5346 #undef elf_backend_arch_data
5347 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5348
5349 #undef elf_backend_relocs_compatible
5350 #undef elf_backend_add_symbol_hook
5351 #define elf_backend_add_symbol_hook \
5352 elf_vxworks_add_symbol_hook
5353 #undef elf_backend_link_output_symbol_hook
5354 #define elf_backend_link_output_symbol_hook \
5355 elf_vxworks_link_output_symbol_hook
5356 #undef elf_backend_emit_relocs
5357 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5358 #undef elf_backend_final_write_processing
5359 #define elf_backend_final_write_processing \
5360 elf_vxworks_final_write_processing
5361 #undef elf_backend_static_tls_alignment
5362
5363 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5364 define it. */
5365 #undef elf_backend_want_plt_sym
5366 #define elf_backend_want_plt_sym 1
5367
5368 #undef elf32_bed
5369 #define elf32_bed elf32_i386_vxworks_bed
5370
5371 #include "elf32-target.h"
GDB Binutils - Deliverables
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