Add -Wshadow to the gcc command line options used when compiling the binutils.
[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 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
21
22 #include "sysdep.h"
23 #include "bfd.h"
24 #include "bfdlink.h"
25 #include "libbfd.h"
26 #include "elf-bfd.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31
32 /* 386 uses REL relocations instead of RELA. */
33 #define USE_REL 1
34
35 #include "elf/i386.h"
36
37 static reloc_howto_type elf_howto_table[]=
38 {
39 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
40 bfd_elf_generic_reloc, "R_386_NONE",
41 TRUE, 0x00000000, 0x00000000, FALSE),
42 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
43 bfd_elf_generic_reloc, "R_386_32",
44 TRUE, 0xffffffff, 0xffffffff, FALSE),
45 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
46 bfd_elf_generic_reloc, "R_386_PC32",
47 TRUE, 0xffffffff, 0xffffffff, TRUE),
48 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
49 bfd_elf_generic_reloc, "R_386_GOT32",
50 TRUE, 0xffffffff, 0xffffffff, FALSE),
51 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
52 bfd_elf_generic_reloc, "R_386_PLT32",
53 TRUE, 0xffffffff, 0xffffffff, TRUE),
54 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
55 bfd_elf_generic_reloc, "R_386_COPY",
56 TRUE, 0xffffffff, 0xffffffff, FALSE),
57 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
58 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
59 TRUE, 0xffffffff, 0xffffffff, FALSE),
60 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
61 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
62 TRUE, 0xffffffff, 0xffffffff, FALSE),
63 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
64 bfd_elf_generic_reloc, "R_386_RELATIVE",
65 TRUE, 0xffffffff, 0xffffffff, FALSE),
66 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
67 bfd_elf_generic_reloc, "R_386_GOTOFF",
68 TRUE, 0xffffffff, 0xffffffff, FALSE),
69 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
70 bfd_elf_generic_reloc, "R_386_GOTPC",
71 TRUE, 0xffffffff, 0xffffffff, TRUE),
72
73 /* We have a gap in the reloc numbers here.
74 R_386_standard counts the number up to this point, and
75 R_386_ext_offset is the value to subtract from a reloc type of
76 R_386_16 thru R_386_PC8 to form an index into this table. */
77 #define R_386_standard (R_386_GOTPC + 1)
78 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
79
80 /* These relocs are a GNU extension. */
81 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
82 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
83 TRUE, 0xffffffff, 0xffffffff, FALSE),
84 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
85 bfd_elf_generic_reloc, "R_386_TLS_IE",
86 TRUE, 0xffffffff, 0xffffffff, FALSE),
87 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
88 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
89 TRUE, 0xffffffff, 0xffffffff, FALSE),
90 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
91 bfd_elf_generic_reloc, "R_386_TLS_LE",
92 TRUE, 0xffffffff, 0xffffffff, FALSE),
93 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_TLS_GD",
95 TRUE, 0xffffffff, 0xffffffff, FALSE),
96 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_TLS_LDM",
98 TRUE, 0xffffffff, 0xffffffff, FALSE),
99 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_16",
101 TRUE, 0xffff, 0xffff, FALSE),
102 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
103 bfd_elf_generic_reloc, "R_386_PC16",
104 TRUE, 0xffff, 0xffff, TRUE),
105 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
106 bfd_elf_generic_reloc, "R_386_8",
107 TRUE, 0xff, 0xff, FALSE),
108 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
109 bfd_elf_generic_reloc, "R_386_PC8",
110 TRUE, 0xff, 0xff, TRUE),
111
112 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
113 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
114 /* These are common with Solaris TLS implementation. */
115 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
116 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
117 TRUE, 0xffffffff, 0xffffffff, FALSE),
118 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
119 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
120 TRUE, 0xffffffff, 0xffffffff, FALSE),
121 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
122 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
123 TRUE, 0xffffffff, 0xffffffff, FALSE),
124 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
125 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
126 TRUE, 0xffffffff, 0xffffffff, FALSE),
127 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
128 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
129 TRUE, 0xffffffff, 0xffffffff, FALSE),
130 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 EMPTY_HOWTO (38),
134 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
135 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
136 TRUE, 0xffffffff, 0xffffffff, FALSE),
137 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
139 FALSE, 0, 0, FALSE),
140 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_TLS_DESC",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_IRELATIVE",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
146
147 /* Another gap. */
148 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
150
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
153 0, /* rightshift */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
155 0, /* bitsize */
156 FALSE, /* pc_relative */
157 0, /* bitpos */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
162 0, /* src_mask */
163 0, /* dst_mask */
164 FALSE), /* pcrel_offset */
165
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
168 0, /* rightshift */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
170 0, /* bitsize */
171 FALSE, /* pc_relative */
172 0, /* bitpos */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
177 0, /* src_mask */
178 0, /* dst_mask */
179 FALSE) /* pcrel_offset */
180
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
182
183 };
184
185 #ifdef DEBUG_GEN_RELOC
186 #define TRACE(str) \
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
188 #else
189 #define TRACE(str)
190 #endif
191
192 static reloc_howto_type *
193 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
194 bfd_reloc_code_real_type code)
195 {
196 switch (code)
197 {
198 case BFD_RELOC_NONE:
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table[R_386_NONE];
201
202 case BFD_RELOC_32:
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table[R_386_32];
205
206 case BFD_RELOC_CTOR:
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table[R_386_32];
209
210 case BFD_RELOC_32_PCREL:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table[R_386_PC32];
213
214 case BFD_RELOC_386_GOT32:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table[R_386_GOT32];
217
218 case BFD_RELOC_386_PLT32:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table[R_386_PLT32];
221
222 case BFD_RELOC_386_COPY:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table[R_386_COPY];
225
226 case BFD_RELOC_386_GLOB_DAT:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table[R_386_GLOB_DAT];
229
230 case BFD_RELOC_386_JUMP_SLOT:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table[R_386_JUMP_SLOT];
233
234 case BFD_RELOC_386_RELATIVE:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table[R_386_RELATIVE];
237
238 case BFD_RELOC_386_GOTOFF:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table[R_386_GOTOFF];
241
242 case BFD_RELOC_386_GOTPC:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table[R_386_GOTPC];
245
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
250
251 case BFD_RELOC_386_TLS_IE:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
254
255 case BFD_RELOC_386_TLS_GOTIE:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
258
259 case BFD_RELOC_386_TLS_LE:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
262
263 case BFD_RELOC_386_TLS_GD:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
266
267 case BFD_RELOC_386_TLS_LDM:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
270
271 case BFD_RELOC_16:
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table[R_386_16 - R_386_ext_offset];
274
275 case BFD_RELOC_16_PCREL:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
278
279 case BFD_RELOC_8:
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table[R_386_8 - R_386_ext_offset];
282
283 case BFD_RELOC_8_PCREL:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
286
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
291
292 case BFD_RELOC_386_TLS_IE_32:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
295
296 case BFD_RELOC_386_TLS_LE_32:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
299
300 case BFD_RELOC_386_TLS_DTPMOD32:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
303
304 case BFD_RELOC_386_TLS_DTPOFF32:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
307
308 case BFD_RELOC_386_TLS_TPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
311
312 case BFD_RELOC_386_TLS_GOTDESC:
313 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
314 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
315
316 case BFD_RELOC_386_TLS_DESC_CALL:
317 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
318 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
319
320 case BFD_RELOC_386_TLS_DESC:
321 TRACE ("BFD_RELOC_386_TLS_DESC");
322 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
323
324 case BFD_RELOC_386_IRELATIVE:
325 TRACE ("BFD_RELOC_386_IRELATIVE");
326 return &elf_howto_table[R_386_IRELATIVE];
327
328 case BFD_RELOC_VTABLE_INHERIT:
329 TRACE ("BFD_RELOC_VTABLE_INHERIT");
330 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
331
332 case BFD_RELOC_VTABLE_ENTRY:
333 TRACE ("BFD_RELOC_VTABLE_ENTRY");
334 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
335
336 default:
337 break;
338 }
339
340 TRACE ("Unknown");
341 return 0;
342 }
343
344 static reloc_howto_type *
345 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
346 const char *r_name)
347 {
348 unsigned int i;
349
350 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
351 if (elf_howto_table[i].name != NULL
352 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
353 return &elf_howto_table[i];
354
355 return NULL;
356 }
357
358 static reloc_howto_type *
359 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
360 {
361 unsigned int indx;
362
363 if ((indx = r_type) >= R_386_standard
364 && ((indx = r_type - R_386_ext_offset) - R_386_standard
365 >= R_386_ext - R_386_standard)
366 && ((indx = r_type - R_386_tls_offset) - R_386_ext
367 >= R_386_irelative - R_386_ext)
368 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
369 >= R_386_vt - R_386_irelative))
370 {
371 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
372 abfd, (int) r_type);
373 indx = R_386_NONE;
374 }
375 BFD_ASSERT (elf_howto_table [indx].type == r_type);
376 return &elf_howto_table[indx];
377 }
378
379 static void
380 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
381 arelent *cache_ptr,
382 Elf_Internal_Rela *dst)
383 {
384 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
385 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
386 }
387
388 /* Return whether a symbol name implies a local label. The UnixWare
389 2.1 cc generates temporary symbols that start with .X, so we
390 recognize them here. FIXME: do other SVR4 compilers also use .X?.
391 If so, we should move the .X recognition into
392 _bfd_elf_is_local_label_name. */
393
394 static bfd_boolean
395 elf_i386_is_local_label_name (bfd *abfd, const char *name)
396 {
397 if (name[0] == '.' && name[1] == 'X')
398 return TRUE;
399
400 return _bfd_elf_is_local_label_name (abfd, name);
401 }
402 \f
403 /* Support for core dump NOTE sections. */
404
405 static bfd_boolean
406 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
407 {
408 int offset;
409 size_t size;
410
411 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
412 {
413 int pr_version = bfd_get_32 (abfd, note->descdata);
414
415 if (pr_version != 1)
416 return FALSE;
417
418 /* pr_cursig */
419 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
420
421 /* pr_pid */
422 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
423
424 /* pr_reg */
425 offset = 28;
426 size = bfd_get_32 (abfd, note->descdata + 8);
427 }
428 else
429 {
430 switch (note->descsz)
431 {
432 default:
433 return FALSE;
434
435 case 144: /* Linux/i386 */
436 /* pr_cursig */
437 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
438
439 /* pr_pid */
440 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
441
442 /* pr_reg */
443 offset = 72;
444 size = 68;
445
446 break;
447 }
448 }
449
450 /* Make a ".reg/999" section. */
451 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
452 size, note->descpos + offset);
453 }
454
455 static bfd_boolean
456 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
457 {
458 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
459 {
460 int pr_version = bfd_get_32 (abfd, note->descdata);
461
462 if (pr_version != 1)
463 return FALSE;
464
465 elf_tdata (abfd)->core_program
466 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
467 elf_tdata (abfd)->core_command
468 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
469 }
470 else
471 {
472 switch (note->descsz)
473 {
474 default:
475 return FALSE;
476
477 case 124: /* Linux/i386 elf_prpsinfo. */
478 elf_tdata (abfd)->core_program
479 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
480 elf_tdata (abfd)->core_command
481 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
482 }
483 }
484
485 /* Note that for some reason, a spurious space is tacked
486 onto the end of the args in some (at least one anyway)
487 implementations, so strip it off if it exists. */
488 {
489 char *command = elf_tdata (abfd)->core_command;
490 int n = strlen (command);
491
492 if (0 < n && command[n - 1] == ' ')
493 command[n - 1] = '\0';
494 }
495
496 return TRUE;
497 }
498 \f
499 /* Functions for the i386 ELF linker.
500
501 In order to gain some understanding of code in this file without
502 knowing all the intricate details of the linker, note the
503 following:
504
505 Functions named elf_i386_* are called by external routines, other
506 functions are only called locally. elf_i386_* functions appear
507 in this file more or less in the order in which they are called
508 from external routines. eg. elf_i386_check_relocs is called
509 early in the link process, elf_i386_finish_dynamic_sections is
510 one of the last functions. */
511
512
513 /* The name of the dynamic interpreter. This is put in the .interp
514 section. */
515
516 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
517
518 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
519 copying dynamic variables from a shared lib into an app's dynbss
520 section, and instead use a dynamic relocation to point into the
521 shared lib. */
522 #define ELIMINATE_COPY_RELOCS 1
523
524 /* The size in bytes of an entry in the procedure linkage table. */
525
526 #define PLT_ENTRY_SIZE 16
527
528 /* The first entry in an absolute procedure linkage table looks like
529 this. See the SVR4 ABI i386 supplement to see how this works.
530 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
531
532 static const bfd_byte elf_i386_plt0_entry[12] =
533 {
534 0xff, 0x35, /* pushl contents of address */
535 0, 0, 0, 0, /* replaced with address of .got + 4. */
536 0xff, 0x25, /* jmp indirect */
537 0, 0, 0, 0 /* replaced with address of .got + 8. */
538 };
539
540 /* Subsequent entries in an absolute procedure linkage table look like
541 this. */
542
543 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
544 {
545 0xff, 0x25, /* jmp indirect */
546 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
547 0x68, /* pushl immediate */
548 0, 0, 0, 0, /* replaced with offset into relocation table. */
549 0xe9, /* jmp relative */
550 0, 0, 0, 0 /* replaced with offset to start of .plt. */
551 };
552
553 /* The first entry in a PIC procedure linkage table look like this.
554 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
555
556 static const bfd_byte elf_i386_pic_plt0_entry[12] =
557 {
558 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
559 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
560 };
561
562 /* Subsequent entries in a PIC procedure linkage table look like this. */
563
564 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
565 {
566 0xff, 0xa3, /* jmp *offset(%ebx) */
567 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
568 0x68, /* pushl immediate */
569 0, 0, 0, 0, /* replaced with offset into relocation table. */
570 0xe9, /* jmp relative */
571 0, 0, 0, 0 /* replaced with offset to start of .plt. */
572 };
573
574 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
575 for the PLTResolve stub and then for each PLT entry. */
576 #define PLTRESOLVE_RELOCS_SHLIB 0
577 #define PLTRESOLVE_RELOCS 2
578 #define PLT_NON_JUMP_SLOT_RELOCS 2
579
580 /* i386 ELF linker hash entry. */
581
582 struct elf_i386_link_hash_entry
583 {
584 struct elf_link_hash_entry elf;
585
586 /* Track dynamic relocs copied for this symbol. */
587 struct elf_dyn_relocs *dyn_relocs;
588
589 #define GOT_UNKNOWN 0
590 #define GOT_NORMAL 1
591 #define GOT_TLS_GD 2
592 #define GOT_TLS_IE 4
593 #define GOT_TLS_IE_POS 5
594 #define GOT_TLS_IE_NEG 6
595 #define GOT_TLS_IE_BOTH 7
596 #define GOT_TLS_GDESC 8
597 #define GOT_TLS_GD_BOTH_P(type) \
598 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
599 #define GOT_TLS_GD_P(type) \
600 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
601 #define GOT_TLS_GDESC_P(type) \
602 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
603 #define GOT_TLS_GD_ANY_P(type) \
604 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
605 unsigned char tls_type;
606
607 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
608 starting at the end of the jump table. */
609 bfd_vma tlsdesc_got;
610 };
611
612 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
613
614 struct elf_i386_obj_tdata
615 {
616 struct elf_obj_tdata root;
617
618 /* tls_type for each local got entry. */
619 char *local_got_tls_type;
620
621 /* GOTPLT entries for TLS descriptors. */
622 bfd_vma *local_tlsdesc_gotent;
623 };
624
625 #define elf_i386_tdata(abfd) \
626 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
627
628 #define elf_i386_local_got_tls_type(abfd) \
629 (elf_i386_tdata (abfd)->local_got_tls_type)
630
631 #define elf_i386_local_tlsdesc_gotent(abfd) \
632 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
633
634 #define is_i386_elf(bfd) \
635 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
636 && elf_tdata (bfd) != NULL \
637 && elf_object_id (bfd) == I386_ELF_TDATA)
638
639 static bfd_boolean
640 elf_i386_mkobject (bfd *abfd)
641 {
642 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
643 I386_ELF_TDATA);
644 }
645
646 /* i386 ELF linker hash table. */
647
648 struct elf_i386_link_hash_table
649 {
650 struct elf_link_hash_table elf;
651
652 /* Short-cuts to get to dynamic linker sections. */
653 asection *sdynbss;
654 asection *srelbss;
655
656 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
657 asection *srelplt2;
658
659 /* True if the target system is VxWorks. */
660 int is_vxworks;
661
662 /* Value used to fill the last word of the first plt entry. */
663 bfd_byte plt0_pad_byte;
664
665 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
666 bfd_vma next_tls_desc_index;
667
668 union {
669 bfd_signed_vma refcount;
670 bfd_vma offset;
671 } tls_ldm_got;
672
673 /* The amount of space used by the reserved portion of the sgotplt
674 section, plus whatever space is used by the jump slots. */
675 bfd_vma sgotplt_jump_table_size;
676
677 /* Small local sym cache. */
678 struct sym_cache sym_cache;
679
680 /* _TLS_MODULE_BASE_ symbol. */
681 struct bfd_link_hash_entry *tls_module_base;
682
683 /* Used by local STT_GNU_IFUNC symbols. */
684 htab_t loc_hash_table;
685 void *loc_hash_memory;
686 };
687
688 /* Get the i386 ELF linker hash table from a link_info structure. */
689
690 #define elf_i386_hash_table(p) \
691 ((struct elf_i386_link_hash_table *) ((p)->hash))
692
693 #define elf_i386_compute_jump_table_size(htab) \
694 ((htab)->next_tls_desc_index * 4)
695
696 /* Create an entry in an i386 ELF linker hash table. */
697
698 static struct bfd_hash_entry *
699 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
700 struct bfd_hash_table *table,
701 const char *string)
702 {
703 /* Allocate the structure if it has not already been allocated by a
704 subclass. */
705 if (entry == NULL)
706 {
707 entry = (struct bfd_hash_entry *)
708 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
709 if (entry == NULL)
710 return entry;
711 }
712
713 /* Call the allocation method of the superclass. */
714 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
715 if (entry != NULL)
716 {
717 struct elf_i386_link_hash_entry *eh;
718
719 eh = (struct elf_i386_link_hash_entry *) entry;
720 eh->dyn_relocs = NULL;
721 eh->tls_type = GOT_UNKNOWN;
722 eh->tlsdesc_got = (bfd_vma) -1;
723 }
724
725 return entry;
726 }
727
728 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
729 for local symbol so that we can handle local STT_GNU_IFUNC symbols
730 as global symbol. We reuse indx and dynstr_index for local symbol
731 hash since they aren't used by global symbols in this backend. */
732
733 static hashval_t
734 elf_i386_local_htab_hash (const void *ptr)
735 {
736 struct elf_link_hash_entry *h
737 = (struct elf_link_hash_entry *) ptr;
738 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
739 }
740
741 /* Compare local hash entries. */
742
743 static int
744 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
745 {
746 struct elf_link_hash_entry *h1
747 = (struct elf_link_hash_entry *) ptr1;
748 struct elf_link_hash_entry *h2
749 = (struct elf_link_hash_entry *) ptr2;
750
751 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
752 }
753
754 /* Find and/or create a hash entry for local symbol. */
755
756 static struct elf_link_hash_entry *
757 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
758 bfd *abfd, const Elf_Internal_Rela *rel,
759 bfd_boolean create)
760 {
761 struct elf_i386_link_hash_entry e, *ret;
762 asection *sec = abfd->sections;
763 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
764 ELF32_R_SYM (rel->r_info));
765 void **slot;
766
767 e.elf.indx = sec->id;
768 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
769 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
770 create ? INSERT : NO_INSERT);
771
772 if (!slot)
773 return NULL;
774
775 if (*slot)
776 {
777 ret = (struct elf_i386_link_hash_entry *) *slot;
778 return &ret->elf;
779 }
780
781 ret = (struct elf_i386_link_hash_entry *)
782 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
783 sizeof (struct elf_i386_link_hash_entry));
784 if (ret)
785 {
786 memset (ret, 0, sizeof (*ret));
787 ret->elf.indx = sec->id;
788 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
789 ret->elf.dynindx = -1;
790 ret->elf.plt.offset = (bfd_vma) -1;
791 ret->elf.got.offset = (bfd_vma) -1;
792 *slot = ret;
793 }
794 return &ret->elf;
795 }
796
797 /* Create an i386 ELF linker hash table. */
798
799 static struct bfd_link_hash_table *
800 elf_i386_link_hash_table_create (bfd *abfd)
801 {
802 struct elf_i386_link_hash_table *ret;
803 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
804
805 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
806 if (ret == NULL)
807 return NULL;
808
809 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
810 elf_i386_link_hash_newfunc,
811 sizeof (struct elf_i386_link_hash_entry)))
812 {
813 free (ret);
814 return NULL;
815 }
816
817 ret->sdynbss = NULL;
818 ret->srelbss = NULL;
819 ret->tls_ldm_got.refcount = 0;
820 ret->next_tls_desc_index = 0;
821 ret->sgotplt_jump_table_size = 0;
822 ret->sym_cache.abfd = NULL;
823 ret->is_vxworks = 0;
824 ret->srelplt2 = NULL;
825 ret->plt0_pad_byte = 0;
826 ret->tls_module_base = NULL;
827
828 ret->loc_hash_table = htab_try_create (1024,
829 elf_i386_local_htab_hash,
830 elf_i386_local_htab_eq,
831 NULL);
832 ret->loc_hash_memory = objalloc_create ();
833 if (!ret->loc_hash_table || !ret->loc_hash_memory)
834 {
835 free (ret);
836 return NULL;
837 }
838
839 return &ret->elf.root;
840 }
841
842 /* Destroy an i386 ELF linker hash table. */
843
844 static void
845 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
846 {
847 struct elf_i386_link_hash_table *htab
848 = (struct elf_i386_link_hash_table *) hash;
849
850 if (htab->loc_hash_table)
851 htab_delete (htab->loc_hash_table);
852 if (htab->loc_hash_memory)
853 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
854 _bfd_generic_link_hash_table_free (hash);
855 }
856
857 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
858 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
859 hash table. */
860
861 static bfd_boolean
862 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
863 {
864 struct elf_i386_link_hash_table *htab;
865
866 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
867 return FALSE;
868
869 htab = elf_i386_hash_table (info);
870 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
871 if (!info->shared)
872 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
873
874 if (!htab->sdynbss
875 || (!info->shared && !htab->srelbss))
876 abort ();
877
878 if (htab->is_vxworks
879 && !elf_vxworks_create_dynamic_sections (dynobj, info,
880 &htab->srelplt2))
881 return FALSE;
882
883 return TRUE;
884 }
885
886 /* Copy the extra info we tack onto an elf_link_hash_entry. */
887
888 static void
889 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
890 struct elf_link_hash_entry *dir,
891 struct elf_link_hash_entry *ind)
892 {
893 struct elf_i386_link_hash_entry *edir, *eind;
894
895 edir = (struct elf_i386_link_hash_entry *) dir;
896 eind = (struct elf_i386_link_hash_entry *) ind;
897
898 if (eind->dyn_relocs != NULL)
899 {
900 if (edir->dyn_relocs != NULL)
901 {
902 struct elf_dyn_relocs **pp;
903 struct elf_dyn_relocs *p;
904
905 /* Add reloc counts against the indirect sym to the direct sym
906 list. Merge any entries against the same section. */
907 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
908 {
909 struct elf_dyn_relocs *q;
910
911 for (q = edir->dyn_relocs; q != NULL; q = q->next)
912 if (q->sec == p->sec)
913 {
914 q->pc_count += p->pc_count;
915 q->count += p->count;
916 *pp = p->next;
917 break;
918 }
919 if (q == NULL)
920 pp = &p->next;
921 }
922 *pp = edir->dyn_relocs;
923 }
924
925 edir->dyn_relocs = eind->dyn_relocs;
926 eind->dyn_relocs = NULL;
927 }
928
929 if (ind->root.type == bfd_link_hash_indirect
930 && dir->got.refcount <= 0)
931 {
932 edir->tls_type = eind->tls_type;
933 eind->tls_type = GOT_UNKNOWN;
934 }
935
936 if (ELIMINATE_COPY_RELOCS
937 && ind->root.type != bfd_link_hash_indirect
938 && dir->dynamic_adjusted)
939 {
940 /* If called to transfer flags for a weakdef during processing
941 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
942 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
943 dir->ref_dynamic |= ind->ref_dynamic;
944 dir->ref_regular |= ind->ref_regular;
945 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
946 dir->needs_plt |= ind->needs_plt;
947 dir->pointer_equality_needed |= ind->pointer_equality_needed;
948 }
949 else
950 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
951 }
952
953 typedef union
954 {
955 unsigned char c[2];
956 uint16_t i;
957 }
958 i386_opcode16;
959
960 /* Return TRUE if the TLS access code sequence support transition
961 from R_TYPE. */
962
963 static bfd_boolean
964 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
965 bfd_byte *contents,
966 Elf_Internal_Shdr *symtab_hdr,
967 struct elf_link_hash_entry **sym_hashes,
968 unsigned int r_type,
969 const Elf_Internal_Rela *rel,
970 const Elf_Internal_Rela *relend)
971 {
972 unsigned int val, type;
973 unsigned long r_symndx;
974 struct elf_link_hash_entry *h;
975 bfd_vma offset;
976
977 /* Get the section contents. */
978 if (contents == NULL)
979 {
980 if (elf_section_data (sec)->this_hdr.contents != NULL)
981 contents = elf_section_data (sec)->this_hdr.contents;
982 else
983 {
984 /* FIXME: How to better handle error condition? */
985 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
986 return FALSE;
987
988 /* Cache the section contents for elf_link_input_bfd. */
989 elf_section_data (sec)->this_hdr.contents = contents;
990 }
991 }
992
993 offset = rel->r_offset;
994 switch (r_type)
995 {
996 case R_386_TLS_GD:
997 case R_386_TLS_LDM:
998 if (offset < 2 || (rel + 1) >= relend)
999 return FALSE;
1000
1001 type = bfd_get_8 (abfd, contents + offset - 2);
1002 if (r_type == R_386_TLS_GD)
1003 {
1004 /* Check transition from GD access model. Only
1005 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1006 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1007 can transit to different access model. */
1008 if ((offset + 10) > sec->size ||
1009 (type != 0x8d && type != 0x04))
1010 return FALSE;
1011
1012 val = bfd_get_8 (abfd, contents + offset - 1);
1013 if (type == 0x04)
1014 {
1015 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1016 if (offset < 3)
1017 return FALSE;
1018
1019 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1020 return FALSE;
1021
1022 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1023 return FALSE;
1024 }
1025 else
1026 {
1027 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1028 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1029 return FALSE;
1030
1031 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1032 return FALSE;
1033 }
1034 }
1035 else
1036 {
1037 /* Check transition from LD access model. Only
1038 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1039 can transit to different access model. */
1040 if (type != 0x8d || (offset + 9) > sec->size)
1041 return FALSE;
1042
1043 val = bfd_get_8 (abfd, contents + offset - 1);
1044 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1045 return FALSE;
1046 }
1047
1048 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1049 return FALSE;
1050
1051 r_symndx = ELF32_R_SYM (rel[1].r_info);
1052 if (r_symndx < symtab_hdr->sh_info)
1053 return FALSE;
1054
1055 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1056 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1057 may be versioned. */
1058 return (h != NULL
1059 && h->root.root.string != NULL
1060 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1061 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1062 && (strncmp (h->root.root.string, "___tls_get_addr",
1063 15) == 0));
1064
1065 case R_386_TLS_IE:
1066 /* Check transition from IE access model:
1067 movl foo@indntpoff(%rip), %eax
1068 movl foo@indntpoff(%rip), %reg
1069 addl foo@indntpoff(%rip), %reg
1070 */
1071
1072 if (offset < 1 || (offset + 4) > sec->size)
1073 return FALSE;
1074
1075 /* Check "movl foo@tpoff(%rip), %eax" first. */
1076 val = bfd_get_8 (abfd, contents + offset - 1);
1077 if (val == 0xa1)
1078 return TRUE;
1079
1080 if (offset < 2)
1081 return FALSE;
1082
1083 /* Check movl|addl foo@tpoff(%rip), %reg. */
1084 type = bfd_get_8 (abfd, contents + offset - 2);
1085 return ((type == 0x8b || type == 0x03)
1086 && (val & 0xc7) == 0x05);
1087
1088 case R_386_TLS_GOTIE:
1089 case R_386_TLS_IE_32:
1090 /* Check transition from {IE_32,GOTIE} access model:
1091 subl foo@{tpoff,gontoff}(%reg1), %reg2
1092 movl foo@{tpoff,gontoff}(%reg1), %reg2
1093 addl foo@{tpoff,gontoff}(%reg1), %reg2
1094 */
1095
1096 if (offset < 2 || (offset + 4) > sec->size)
1097 return FALSE;
1098
1099 val = bfd_get_8 (abfd, contents + offset - 1);
1100 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1101 return FALSE;
1102
1103 type = bfd_get_8 (abfd, contents + offset - 2);
1104 return type == 0x8b || type == 0x2b || type == 0x03;
1105
1106 case R_386_TLS_GOTDESC:
1107 /* Check transition from GDesc access model:
1108 leal x@tlsdesc(%ebx), %eax
1109
1110 Make sure it's a leal adding ebx to a 32-bit offset
1111 into any register, although it's probably almost always
1112 going to be eax. */
1113
1114 if (offset < 2 || (offset + 4) > sec->size)
1115 return FALSE;
1116
1117 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1118 return FALSE;
1119
1120 val = bfd_get_8 (abfd, contents + offset - 1);
1121 return (val & 0xc7) == 0x83;
1122
1123 case R_386_TLS_DESC_CALL:
1124 /* Check transition from GDesc access model:
1125 call *x@tlsdesc(%rax)
1126 */
1127 if (offset + 2 <= sec->size)
1128 {
1129 /* Make sure that it's a call *x@tlsdesc(%rax). */
1130 static i386_opcode16 call = { { 0xff, 0x10 } };
1131 return bfd_get_16 (abfd, contents + offset) == call.i;
1132 }
1133
1134 return FALSE;
1135
1136 default:
1137 abort ();
1138 }
1139 }
1140
1141 /* Return TRUE if the TLS access transition is OK or no transition
1142 will be performed. Update R_TYPE if there is a transition. */
1143
1144 static bfd_boolean
1145 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1146 asection *sec, bfd_byte *contents,
1147 Elf_Internal_Shdr *symtab_hdr,
1148 struct elf_link_hash_entry **sym_hashes,
1149 unsigned int *r_type, int tls_type,
1150 const Elf_Internal_Rela *rel,
1151 const Elf_Internal_Rela *relend,
1152 struct elf_link_hash_entry *h,
1153 unsigned long r_symndx)
1154 {
1155 unsigned int from_type = *r_type;
1156 unsigned int to_type = from_type;
1157 bfd_boolean check = TRUE;
1158
1159 switch (from_type)
1160 {
1161 case R_386_TLS_GD:
1162 case R_386_TLS_GOTDESC:
1163 case R_386_TLS_DESC_CALL:
1164 case R_386_TLS_IE_32:
1165 case R_386_TLS_IE:
1166 case R_386_TLS_GOTIE:
1167 if (info->executable)
1168 {
1169 if (h == NULL)
1170 to_type = R_386_TLS_LE_32;
1171 else if (from_type != R_386_TLS_IE
1172 && from_type != R_386_TLS_GOTIE)
1173 to_type = R_386_TLS_IE_32;
1174 }
1175
1176 /* When we are called from elf_i386_relocate_section, CONTENTS
1177 isn't NULL and there may be additional transitions based on
1178 TLS_TYPE. */
1179 if (contents != NULL)
1180 {
1181 unsigned int new_to_type = to_type;
1182
1183 if (info->executable
1184 && h != NULL
1185 && h->dynindx == -1
1186 && (tls_type & GOT_TLS_IE))
1187 new_to_type = R_386_TLS_LE_32;
1188
1189 if (to_type == R_386_TLS_GD
1190 || to_type == R_386_TLS_GOTDESC
1191 || to_type == R_386_TLS_DESC_CALL)
1192 {
1193 if (tls_type == GOT_TLS_IE_POS)
1194 new_to_type = R_386_TLS_GOTIE;
1195 else if (tls_type & GOT_TLS_IE)
1196 new_to_type = R_386_TLS_IE_32;
1197 }
1198
1199 /* We checked the transition before when we were called from
1200 elf_i386_check_relocs. We only want to check the new
1201 transition which hasn't been checked before. */
1202 check = new_to_type != to_type && from_type == to_type;
1203 to_type = new_to_type;
1204 }
1205
1206 break;
1207
1208 case R_386_TLS_LDM:
1209 if (info->executable)
1210 to_type = R_386_TLS_LE_32;
1211 break;
1212
1213 default:
1214 return TRUE;
1215 }
1216
1217 /* Return TRUE if there is no transition. */
1218 if (from_type == to_type)
1219 return TRUE;
1220
1221 /* Check if the transition can be performed. */
1222 if (check
1223 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1224 symtab_hdr, sym_hashes,
1225 from_type, rel, relend))
1226 {
1227 reloc_howto_type *from, *to;
1228 const char *name;
1229
1230 from = elf_i386_rtype_to_howto (abfd, from_type);
1231 to = elf_i386_rtype_to_howto (abfd, to_type);
1232
1233 if (h)
1234 name = h->root.root.string;
1235 else
1236 {
1237 Elf_Internal_Sym *isym;
1238 struct elf_i386_link_hash_table *htab;
1239 htab = elf_i386_hash_table (info);
1240 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1241 abfd, r_symndx);
1242 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1243 }
1244
1245 (*_bfd_error_handler)
1246 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1247 "in section `%A' failed"),
1248 abfd, sec, from->name, to->name, name,
1249 (unsigned long) rel->r_offset);
1250 bfd_set_error (bfd_error_bad_value);
1251 return FALSE;
1252 }
1253
1254 *r_type = to_type;
1255 return TRUE;
1256 }
1257
1258 /* Look through the relocs for a section during the first phase, and
1259 calculate needed space in the global offset table, procedure linkage
1260 table, and dynamic reloc sections. */
1261
1262 static bfd_boolean
1263 elf_i386_check_relocs (bfd *abfd,
1264 struct bfd_link_info *info,
1265 asection *sec,
1266 const Elf_Internal_Rela *relocs)
1267 {
1268 struct elf_i386_link_hash_table *htab;
1269 Elf_Internal_Shdr *symtab_hdr;
1270 struct elf_link_hash_entry **sym_hashes;
1271 const Elf_Internal_Rela *rel;
1272 const Elf_Internal_Rela *rel_end;
1273 asection *sreloc;
1274
1275 if (info->relocatable)
1276 return TRUE;
1277
1278 BFD_ASSERT (is_i386_elf (abfd));
1279
1280 htab = elf_i386_hash_table (info);
1281 symtab_hdr = &elf_symtab_hdr (abfd);
1282 sym_hashes = elf_sym_hashes (abfd);
1283
1284 sreloc = NULL;
1285
1286 rel_end = relocs + sec->reloc_count;
1287 for (rel = relocs; rel < rel_end; rel++)
1288 {
1289 unsigned int r_type;
1290 unsigned long r_symndx;
1291 struct elf_link_hash_entry *h;
1292 Elf_Internal_Sym *isym;
1293 const char *name;
1294
1295 r_symndx = ELF32_R_SYM (rel->r_info);
1296 r_type = ELF32_R_TYPE (rel->r_info);
1297
1298 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1299 {
1300 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1301 abfd,
1302 r_symndx);
1303 return FALSE;
1304 }
1305
1306 if (r_symndx < symtab_hdr->sh_info)
1307 {
1308 /* A local symbol. */
1309 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1310 abfd, r_symndx);
1311 if (isym == NULL)
1312 return FALSE;
1313
1314 /* Check relocation against local STT_GNU_IFUNC symbol. */
1315 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1316 {
1317 h = elf_i386_get_local_sym_hash (htab, abfd, rel,
1318 TRUE);
1319 if (h == NULL)
1320 return FALSE;
1321
1322 /* Fake a STT_GNU_IFUNC symbol. */
1323 h->type = STT_GNU_IFUNC;
1324 h->def_regular = 1;
1325 h->ref_regular = 1;
1326 h->forced_local = 1;
1327 h->root.type = bfd_link_hash_defined;
1328 }
1329 else
1330 h = NULL;
1331 }
1332 else
1333 {
1334 isym = NULL;
1335 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1336 while (h->root.type == bfd_link_hash_indirect
1337 || h->root.type == bfd_link_hash_warning)
1338 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1339 }
1340
1341 if (h != NULL)
1342 {
1343 /* Create the ifunc sections for static executables. If we
1344 never see an indirect function symbol nor we are building
1345 a static executable, those sections will be empty and
1346 won't appear in output. */
1347 switch (r_type)
1348 {
1349 default:
1350 break;
1351
1352 case R_386_32:
1353 case R_386_PC32:
1354 case R_386_PLT32:
1355 case R_386_GOT32:
1356 case R_386_GOTOFF:
1357 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1358 return FALSE;
1359 break;
1360 }
1361
1362 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1363 it here if it is defined in a non-shared object. */
1364 if (h->type == STT_GNU_IFUNC
1365 && h->def_regular)
1366 {
1367 /* It is referenced by a non-shared object. */
1368 h->ref_regular = 1;
1369 h->needs_plt = 1;
1370
1371 /* STT_GNU_IFUNC symbol must go through PLT. */
1372 h->plt.refcount += 1;
1373
1374 /* STT_GNU_IFUNC needs dynamic sections. */
1375 if (htab->elf.dynobj == NULL)
1376 htab->elf.dynobj = abfd;
1377
1378 switch (r_type)
1379 {
1380 default:
1381 if (h->root.root.string)
1382 name = h->root.root.string;
1383 else
1384 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1385 NULL);
1386 (*_bfd_error_handler)
1387 (_("%B: relocation %s against STT_GNU_IFUNC "
1388 "symbol `%s' isn't handled by %s"), abfd,
1389 elf_howto_table[r_type].name,
1390 name, __FUNCTION__);
1391 bfd_set_error (bfd_error_bad_value);
1392 return FALSE;
1393
1394 case R_386_32:
1395 h->non_got_ref = 1;
1396 h->pointer_equality_needed = 1;
1397 if (info->shared)
1398 {
1399 /* We must copy these reloc types into the
1400 output file. Create a reloc section in
1401 dynobj and make room for this reloc. */
1402 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1403 (abfd, info, sec, sreloc,
1404 &((struct elf_i386_link_hash_entry *) h)->dyn_relocs);
1405 if (sreloc == NULL)
1406 return FALSE;
1407 }
1408 break;
1409
1410 case R_386_PC32:
1411 h->non_got_ref = 1;
1412 break;
1413
1414 case R_386_PLT32:
1415 break;
1416
1417 case R_386_GOT32:
1418 case R_386_GOTOFF:
1419 h->got.refcount += 1;
1420 if (htab->elf.sgot == NULL
1421 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1422 info))
1423 return FALSE;
1424 break;
1425 }
1426
1427 continue;
1428 }
1429 }
1430
1431 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1432 symtab_hdr, sym_hashes,
1433 &r_type, GOT_UNKNOWN,
1434 rel, rel_end, h, r_symndx))
1435 return FALSE;
1436
1437 switch (r_type)
1438 {
1439 case R_386_TLS_LDM:
1440 htab->tls_ldm_got.refcount += 1;
1441 goto create_got;
1442
1443 case R_386_PLT32:
1444 /* This symbol requires a procedure linkage table entry. We
1445 actually build the entry in adjust_dynamic_symbol,
1446 because this might be a case of linking PIC code which is
1447 never referenced by a dynamic object, in which case we
1448 don't need to generate a procedure linkage table entry
1449 after all. */
1450
1451 /* If this is a local symbol, we resolve it directly without
1452 creating a procedure linkage table entry. */
1453 if (h == NULL)
1454 continue;
1455
1456 h->needs_plt = 1;
1457 h->plt.refcount += 1;
1458 break;
1459
1460 case R_386_TLS_IE_32:
1461 case R_386_TLS_IE:
1462 case R_386_TLS_GOTIE:
1463 if (!info->executable)
1464 info->flags |= DF_STATIC_TLS;
1465 /* Fall through */
1466
1467 case R_386_GOT32:
1468 case R_386_TLS_GD:
1469 case R_386_TLS_GOTDESC:
1470 case R_386_TLS_DESC_CALL:
1471 /* This symbol requires a global offset table entry. */
1472 {
1473 int tls_type, old_tls_type;
1474
1475 switch (r_type)
1476 {
1477 default:
1478 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1479 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1480 case R_386_TLS_GOTDESC:
1481 case R_386_TLS_DESC_CALL:
1482 tls_type = GOT_TLS_GDESC; break;
1483 case R_386_TLS_IE_32:
1484 if (ELF32_R_TYPE (rel->r_info) == r_type)
1485 tls_type = GOT_TLS_IE_NEG;
1486 else
1487 /* If this is a GD->IE transition, we may use either of
1488 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1489 tls_type = GOT_TLS_IE;
1490 break;
1491 case R_386_TLS_IE:
1492 case R_386_TLS_GOTIE:
1493 tls_type = GOT_TLS_IE_POS; break;
1494 }
1495
1496 if (h != NULL)
1497 {
1498 h->got.refcount += 1;
1499 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1500 }
1501 else
1502 {
1503 bfd_signed_vma *local_got_refcounts;
1504
1505 /* This is a global offset table entry for a local symbol. */
1506 local_got_refcounts = elf_local_got_refcounts (abfd);
1507 if (local_got_refcounts == NULL)
1508 {
1509 bfd_size_type size;
1510
1511 size = symtab_hdr->sh_info;
1512 size *= (sizeof (bfd_signed_vma)
1513 + sizeof (bfd_vma) + sizeof(char));
1514 local_got_refcounts = (bfd_signed_vma *)
1515 bfd_zalloc (abfd, size);
1516 if (local_got_refcounts == NULL)
1517 return FALSE;
1518 elf_local_got_refcounts (abfd) = local_got_refcounts;
1519 elf_i386_local_tlsdesc_gotent (abfd)
1520 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1521 elf_i386_local_got_tls_type (abfd)
1522 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1523 }
1524 local_got_refcounts[r_symndx] += 1;
1525 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1526 }
1527
1528 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1529 tls_type |= old_tls_type;
1530 /* If a TLS symbol is accessed using IE at least once,
1531 there is no point to use dynamic model for it. */
1532 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1533 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1534 || (tls_type & GOT_TLS_IE) == 0))
1535 {
1536 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1537 tls_type = old_tls_type;
1538 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1539 && GOT_TLS_GD_ANY_P (tls_type))
1540 tls_type |= old_tls_type;
1541 else
1542 {
1543 if (h)
1544 name = h->root.root.string;
1545 else
1546 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1547 NULL);
1548 (*_bfd_error_handler)
1549 (_("%B: `%s' accessed both as normal and "
1550 "thread local symbol"),
1551 abfd, name);
1552 return FALSE;
1553 }
1554 }
1555
1556 if (old_tls_type != tls_type)
1557 {
1558 if (h != NULL)
1559 elf_i386_hash_entry (h)->tls_type = tls_type;
1560 else
1561 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1562 }
1563 }
1564 /* Fall through */
1565
1566 case R_386_GOTOFF:
1567 case R_386_GOTPC:
1568 create_got:
1569 if (htab->elf.sgot == NULL)
1570 {
1571 if (htab->elf.dynobj == NULL)
1572 htab->elf.dynobj = abfd;
1573 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1574 return FALSE;
1575 }
1576 if (r_type != R_386_TLS_IE)
1577 break;
1578 /* Fall through */
1579
1580 case R_386_TLS_LE_32:
1581 case R_386_TLS_LE:
1582 if (info->executable)
1583 break;
1584 info->flags |= DF_STATIC_TLS;
1585 /* Fall through */
1586
1587 case R_386_32:
1588 case R_386_PC32:
1589 if (h != NULL && info->executable)
1590 {
1591 /* If this reloc is in a read-only section, we might
1592 need a copy reloc. We can't check reliably at this
1593 stage whether the section is read-only, as input
1594 sections have not yet been mapped to output sections.
1595 Tentatively set the flag for now, and correct in
1596 adjust_dynamic_symbol. */
1597 h->non_got_ref = 1;
1598
1599 /* We may need a .plt entry if the function this reloc
1600 refers to is in a shared lib. */
1601 h->plt.refcount += 1;
1602 if (r_type != R_386_PC32)
1603 h->pointer_equality_needed = 1;
1604 }
1605
1606 /* If we are creating a shared library, and this is a reloc
1607 against a global symbol, or a non PC relative reloc
1608 against a local symbol, then we need to copy the reloc
1609 into the shared library. However, if we are linking with
1610 -Bsymbolic, we do not need to copy a reloc against a
1611 global symbol which is defined in an object we are
1612 including in the link (i.e., DEF_REGULAR is set). At
1613 this point we have not seen all the input files, so it is
1614 possible that DEF_REGULAR is not set now but will be set
1615 later (it is never cleared). In case of a weak definition,
1616 DEF_REGULAR may be cleared later by a strong definition in
1617 a shared library. We account for that possibility below by
1618 storing information in the relocs_copied field of the hash
1619 table entry. A similar situation occurs when creating
1620 shared libraries and symbol visibility changes render the
1621 symbol local.
1622
1623 If on the other hand, we are creating an executable, we
1624 may need to keep relocations for symbols satisfied by a
1625 dynamic library if we manage to avoid copy relocs for the
1626 symbol. */
1627 if ((info->shared
1628 && (sec->flags & SEC_ALLOC) != 0
1629 && (r_type != R_386_PC32
1630 || (h != NULL
1631 && (! SYMBOLIC_BIND (info, h)
1632 || h->root.type == bfd_link_hash_defweak
1633 || !h->def_regular))))
1634 || (ELIMINATE_COPY_RELOCS
1635 && !info->shared
1636 && (sec->flags & SEC_ALLOC) != 0
1637 && h != NULL
1638 && (h->root.type == bfd_link_hash_defweak
1639 || !h->def_regular)))
1640 {
1641 struct elf_dyn_relocs *p;
1642 struct elf_dyn_relocs **head;
1643
1644 /* We must copy these reloc types into the output file.
1645 Create a reloc section in dynobj and make room for
1646 this reloc. */
1647 if (sreloc == NULL)
1648 {
1649 if (htab->elf.dynobj == NULL)
1650 htab->elf.dynobj = abfd;
1651
1652 sreloc = _bfd_elf_make_dynamic_reloc_section
1653 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1654
1655 if (sreloc == NULL)
1656 return FALSE;
1657 }
1658
1659 /* If this is a global symbol, we count the number of
1660 relocations we need for this symbol. */
1661 if (h != NULL)
1662 {
1663 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1664 }
1665 else
1666 {
1667 /* Track dynamic relocs needed for local syms too.
1668 We really need local syms available to do this
1669 easily. Oh well. */
1670 void **vpp;
1671 asection *s;
1672
1673 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1674 abfd, r_symndx);
1675 if (isym == NULL)
1676 return FALSE;
1677
1678 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1679 if (s == NULL)
1680 s = sec;
1681
1682 vpp = &elf_section_data (s)->local_dynrel;
1683 head = (struct elf_dyn_relocs **)vpp;
1684 }
1685
1686 p = *head;
1687 if (p == NULL || p->sec != sec)
1688 {
1689 bfd_size_type amt = sizeof *p;
1690 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1691 amt);
1692 if (p == NULL)
1693 return FALSE;
1694 p->next = *head;
1695 *head = p;
1696 p->sec = sec;
1697 p->count = 0;
1698 p->pc_count = 0;
1699 }
1700
1701 p->count += 1;
1702 if (r_type == R_386_PC32)
1703 p->pc_count += 1;
1704 }
1705 break;
1706
1707 /* This relocation describes the C++ object vtable hierarchy.
1708 Reconstruct it for later use during GC. */
1709 case R_386_GNU_VTINHERIT:
1710 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1711 return FALSE;
1712 break;
1713
1714 /* This relocation describes which C++ vtable entries are actually
1715 used. Record for later use during GC. */
1716 case R_386_GNU_VTENTRY:
1717 BFD_ASSERT (h != NULL);
1718 if (h != NULL
1719 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1720 return FALSE;
1721 break;
1722
1723 default:
1724 break;
1725 }
1726 }
1727
1728 return TRUE;
1729 }
1730
1731 /* Return the section that should be marked against GC for a given
1732 relocation. */
1733
1734 static asection *
1735 elf_i386_gc_mark_hook (asection *sec,
1736 struct bfd_link_info *info,
1737 Elf_Internal_Rela *rel,
1738 struct elf_link_hash_entry *h,
1739 Elf_Internal_Sym *sym)
1740 {
1741 if (h != NULL)
1742 switch (ELF32_R_TYPE (rel->r_info))
1743 {
1744 case R_386_GNU_VTINHERIT:
1745 case R_386_GNU_VTENTRY:
1746 return NULL;
1747 }
1748
1749 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1750 }
1751
1752 /* Update the got entry reference counts for the section being removed. */
1753
1754 static bfd_boolean
1755 elf_i386_gc_sweep_hook (bfd *abfd,
1756 struct bfd_link_info *info,
1757 asection *sec,
1758 const Elf_Internal_Rela *relocs)
1759 {
1760 Elf_Internal_Shdr *symtab_hdr;
1761 struct elf_link_hash_entry **sym_hashes;
1762 bfd_signed_vma *local_got_refcounts;
1763 const Elf_Internal_Rela *rel, *relend;
1764
1765 if (info->relocatable)
1766 return TRUE;
1767
1768 elf_section_data (sec)->local_dynrel = NULL;
1769
1770 symtab_hdr = &elf_symtab_hdr (abfd);
1771 sym_hashes = elf_sym_hashes (abfd);
1772 local_got_refcounts = elf_local_got_refcounts (abfd);
1773
1774 relend = relocs + sec->reloc_count;
1775 for (rel = relocs; rel < relend; rel++)
1776 {
1777 unsigned long r_symndx;
1778 unsigned int r_type;
1779 struct elf_link_hash_entry *h = NULL;
1780
1781 r_symndx = ELF32_R_SYM (rel->r_info);
1782 if (r_symndx >= symtab_hdr->sh_info)
1783 {
1784 struct elf_i386_link_hash_entry *eh;
1785 struct elf_dyn_relocs **pp;
1786 struct elf_dyn_relocs *p;
1787
1788 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1789 while (h->root.type == bfd_link_hash_indirect
1790 || h->root.type == bfd_link_hash_warning)
1791 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1792 eh = (struct elf_i386_link_hash_entry *) h;
1793
1794 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1795 if (p->sec == sec)
1796 {
1797 /* Everything must go for SEC. */
1798 *pp = p->next;
1799 break;
1800 }
1801 }
1802
1803 r_type = ELF32_R_TYPE (rel->r_info);
1804 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1805 symtab_hdr, sym_hashes,
1806 &r_type, GOT_UNKNOWN,
1807 rel, relend, h, r_symndx))
1808 return FALSE;
1809
1810 switch (r_type)
1811 {
1812 case R_386_TLS_LDM:
1813 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1814 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1815 break;
1816
1817 case R_386_TLS_GD:
1818 case R_386_TLS_GOTDESC:
1819 case R_386_TLS_DESC_CALL:
1820 case R_386_TLS_IE_32:
1821 case R_386_TLS_IE:
1822 case R_386_TLS_GOTIE:
1823 case R_386_GOT32:
1824 if (h != NULL)
1825 {
1826 if (h->got.refcount > 0)
1827 h->got.refcount -= 1;
1828 }
1829 else if (local_got_refcounts != NULL)
1830 {
1831 if (local_got_refcounts[r_symndx] > 0)
1832 local_got_refcounts[r_symndx] -= 1;
1833 }
1834 break;
1835
1836 case R_386_32:
1837 case R_386_PC32:
1838 if (info->shared)
1839 break;
1840 /* Fall through */
1841
1842 case R_386_PLT32:
1843 if (h != NULL)
1844 {
1845 if (h->plt.refcount > 0)
1846 h->plt.refcount -= 1;
1847 }
1848 break;
1849
1850 default:
1851 break;
1852 }
1853 }
1854
1855 return TRUE;
1856 }
1857
1858 /* Adjust a symbol defined by a dynamic object and referenced by a
1859 regular object. The current definition is in some section of the
1860 dynamic object, but we're not including those sections. We have to
1861 change the definition to something the rest of the link can
1862 understand. */
1863
1864 static bfd_boolean
1865 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1866 struct elf_link_hash_entry *h)
1867 {
1868 struct elf_i386_link_hash_table *htab;
1869 asection *s;
1870
1871 /* STT_GNU_IFUNC symbol must go through PLT. */
1872 if (h->type == STT_GNU_IFUNC)
1873 {
1874 if (h->plt.refcount <= 0)
1875 {
1876 h->plt.offset = (bfd_vma) -1;
1877 h->needs_plt = 0;
1878 }
1879 return TRUE;
1880 }
1881
1882 /* If this is a function, put it in the procedure linkage table. We
1883 will fill in the contents of the procedure linkage table later,
1884 when we know the address of the .got section. */
1885 if (h->type == STT_FUNC
1886 || h->needs_plt)
1887 {
1888 if (h->plt.refcount <= 0
1889 || SYMBOL_CALLS_LOCAL (info, h)
1890 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1891 && h->root.type == bfd_link_hash_undefweak))
1892 {
1893 /* This case can occur if we saw a PLT32 reloc in an input
1894 file, but the symbol was never referred to by a dynamic
1895 object, or if all references were garbage collected. In
1896 such a case, we don't actually need to build a procedure
1897 linkage table, and we can just do a PC32 reloc instead. */
1898 h->plt.offset = (bfd_vma) -1;
1899 h->needs_plt = 0;
1900 }
1901
1902 return TRUE;
1903 }
1904 else
1905 /* It's possible that we incorrectly decided a .plt reloc was
1906 needed for an R_386_PC32 reloc to a non-function sym in
1907 check_relocs. We can't decide accurately between function and
1908 non-function syms in check-relocs; Objects loaded later in
1909 the link may change h->type. So fix it now. */
1910 h->plt.offset = (bfd_vma) -1;
1911
1912 /* If this is a weak symbol, and there is a real definition, the
1913 processor independent code will have arranged for us to see the
1914 real definition first, and we can just use the same value. */
1915 if (h->u.weakdef != NULL)
1916 {
1917 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1918 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1919 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1920 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1921 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1922 h->non_got_ref = h->u.weakdef->non_got_ref;
1923 return TRUE;
1924 }
1925
1926 /* This is a reference to a symbol defined by a dynamic object which
1927 is not a function. */
1928
1929 /* If we are creating a shared library, we must presume that the
1930 only references to the symbol are via the global offset table.
1931 For such cases we need not do anything here; the relocations will
1932 be handled correctly by relocate_section. */
1933 if (info->shared)
1934 return TRUE;
1935
1936 /* If there are no references to this symbol that do not use the
1937 GOT, we don't need to generate a copy reloc. */
1938 if (!h->non_got_ref)
1939 return TRUE;
1940
1941 /* If -z nocopyreloc was given, we won't generate them either. */
1942 if (info->nocopyreloc)
1943 {
1944 h->non_got_ref = 0;
1945 return TRUE;
1946 }
1947
1948 htab = elf_i386_hash_table (info);
1949
1950 /* If there aren't any dynamic relocs in read-only sections, then
1951 we can keep the dynamic relocs and avoid the copy reloc. This
1952 doesn't work on VxWorks, where we can not have dynamic relocations
1953 (other than copy and jump slot relocations) in an executable. */
1954 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1955 {
1956 struct elf_i386_link_hash_entry * eh;
1957 struct elf_dyn_relocs *p;
1958
1959 eh = (struct elf_i386_link_hash_entry *) h;
1960 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1961 {
1962 s = p->sec->output_section;
1963 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1964 break;
1965 }
1966
1967 if (p == NULL)
1968 {
1969 h->non_got_ref = 0;
1970 return TRUE;
1971 }
1972 }
1973
1974 if (h->size == 0)
1975 {
1976 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1977 h->root.root.string);
1978 return TRUE;
1979 }
1980
1981 /* We must allocate the symbol in our .dynbss section, which will
1982 become part of the .bss section of the executable. There will be
1983 an entry for this symbol in the .dynsym section. The dynamic
1984 object will contain position independent code, so all references
1985 from the dynamic object to this symbol will go through the global
1986 offset table. The dynamic linker will use the .dynsym entry to
1987 determine the address it must put in the global offset table, so
1988 both the dynamic object and the regular object will refer to the
1989 same memory location for the variable. */
1990
1991 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1992 copy the initial value out of the dynamic object and into the
1993 runtime process image. */
1994 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1995 {
1996 htab->srelbss->size += sizeof (Elf32_External_Rel);
1997 h->needs_copy = 1;
1998 }
1999
2000 s = htab->sdynbss;
2001
2002 return _bfd_elf_adjust_dynamic_copy (h, s);
2003 }
2004
2005 /* Allocate space in .plt, .got and associated reloc sections for
2006 dynamic relocs. */
2007
2008 static bfd_boolean
2009 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2010 {
2011 struct bfd_link_info *info;
2012 struct elf_i386_link_hash_table *htab;
2013 struct elf_i386_link_hash_entry *eh;
2014 struct elf_dyn_relocs *p;
2015
2016 if (h->root.type == bfd_link_hash_indirect)
2017 return TRUE;
2018
2019 if (h->root.type == bfd_link_hash_warning)
2020 /* When warning symbols are created, they **replace** the "real"
2021 entry in the hash table, thus we never get to see the real
2022 symbol in a hash traversal. So look at it now. */
2023 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2024 eh = (struct elf_i386_link_hash_entry *) h;
2025
2026 info = (struct bfd_link_info *) inf;
2027 htab = elf_i386_hash_table (info);
2028
2029 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2030 here if it is defined and referenced in a non-shared object. */
2031 if (h->type == STT_GNU_IFUNC
2032 && h->def_regular)
2033 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2034 &eh->dyn_relocs,
2035 PLT_ENTRY_SIZE, 4);
2036 else if (htab->elf.dynamic_sections_created
2037 && h->plt.refcount > 0)
2038 {
2039 /* Make sure this symbol is output as a dynamic symbol.
2040 Undefined weak syms won't yet be marked as dynamic. */
2041 if (h->dynindx == -1
2042 && !h->forced_local)
2043 {
2044 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2045 return FALSE;
2046 }
2047
2048 if (info->shared
2049 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2050 {
2051 asection *s = htab->elf.splt;
2052
2053 /* If this is the first .plt entry, make room for the special
2054 first entry. */
2055 if (s->size == 0)
2056 s->size += PLT_ENTRY_SIZE;
2057
2058 h->plt.offset = s->size;
2059
2060 /* If this symbol is not defined in a regular file, and we are
2061 not generating a shared library, then set the symbol to this
2062 location in the .plt. This is required to make function
2063 pointers compare as equal between the normal executable and
2064 the shared library. */
2065 if (! info->shared
2066 && !h->def_regular)
2067 {
2068 h->root.u.def.section = s;
2069 h->root.u.def.value = h->plt.offset;
2070 }
2071
2072 /* Make room for this entry. */
2073 s->size += PLT_ENTRY_SIZE;
2074
2075 /* We also need to make an entry in the .got.plt section, which
2076 will be placed in the .got section by the linker script. */
2077 htab->elf.sgotplt->size += 4;
2078
2079 /* We also need to make an entry in the .rel.plt section. */
2080 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2081 htab->next_tls_desc_index++;
2082
2083 if (htab->is_vxworks && !info->shared)
2084 {
2085 /* VxWorks has a second set of relocations for each PLT entry
2086 in executables. They go in a separate relocation section,
2087 which is processed by the kernel loader. */
2088
2089 /* There are two relocations for the initial PLT entry: an
2090 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2091 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2092
2093 if (h->plt.offset == PLT_ENTRY_SIZE)
2094 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2095
2096 /* There are two extra relocations for each subsequent PLT entry:
2097 an R_386_32 relocation for the GOT entry, and an R_386_32
2098 relocation for the PLT entry. */
2099
2100 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2101 }
2102 }
2103 else
2104 {
2105 h->plt.offset = (bfd_vma) -1;
2106 h->needs_plt = 0;
2107 }
2108 }
2109 else
2110 {
2111 h->plt.offset = (bfd_vma) -1;
2112 h->needs_plt = 0;
2113 }
2114
2115 eh->tlsdesc_got = (bfd_vma) -1;
2116
2117 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2118 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2119 if (h->got.refcount > 0
2120 && info->executable
2121 && h->dynindx == -1
2122 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2123 h->got.offset = (bfd_vma) -1;
2124 else if (h->got.refcount > 0)
2125 {
2126 asection *s;
2127 bfd_boolean dyn;
2128 int tls_type = elf_i386_hash_entry(h)->tls_type;
2129
2130 /* Make sure this symbol is output as a dynamic symbol.
2131 Undefined weak syms won't yet be marked as dynamic. */
2132 if (h->dynindx == -1
2133 && !h->forced_local)
2134 {
2135 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2136 return FALSE;
2137 }
2138
2139 s = htab->elf.sgot;
2140 if (GOT_TLS_GDESC_P (tls_type))
2141 {
2142 eh->tlsdesc_got = htab->elf.sgotplt->size
2143 - elf_i386_compute_jump_table_size (htab);
2144 htab->elf.sgotplt->size += 8;
2145 h->got.offset = (bfd_vma) -2;
2146 }
2147 if (! GOT_TLS_GDESC_P (tls_type)
2148 || GOT_TLS_GD_P (tls_type))
2149 {
2150 h->got.offset = s->size;
2151 s->size += 4;
2152 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2153 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2154 s->size += 4;
2155 }
2156 dyn = htab->elf.dynamic_sections_created;
2157 /* R_386_TLS_IE_32 needs one dynamic relocation,
2158 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2159 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2160 need two), R_386_TLS_GD needs one if local symbol and two if
2161 global. */
2162 if (tls_type == GOT_TLS_IE_BOTH)
2163 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2164 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2165 || (tls_type & GOT_TLS_IE))
2166 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2167 else if (GOT_TLS_GD_P (tls_type))
2168 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2169 else if (! GOT_TLS_GDESC_P (tls_type)
2170 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2171 || h->root.type != bfd_link_hash_undefweak)
2172 && (info->shared
2173 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2174 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2175 if (GOT_TLS_GDESC_P (tls_type))
2176 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2177 }
2178 else
2179 h->got.offset = (bfd_vma) -1;
2180
2181 if (eh->dyn_relocs == NULL)
2182 return TRUE;
2183
2184 /* In the shared -Bsymbolic case, discard space allocated for
2185 dynamic pc-relative relocs against symbols which turn out to be
2186 defined in regular objects. For the normal shared case, discard
2187 space for pc-relative relocs that have become local due to symbol
2188 visibility changes. */
2189
2190 if (info->shared)
2191 {
2192 /* The only reloc that uses pc_count is R_386_PC32, which will
2193 appear on a call or on something like ".long foo - .". We
2194 want calls to protected symbols to resolve directly to the
2195 function rather than going via the plt. If people want
2196 function pointer comparisons to work as expected then they
2197 should avoid writing assembly like ".long foo - .". */
2198 if (SYMBOL_CALLS_LOCAL (info, h))
2199 {
2200 struct elf_dyn_relocs **pp;
2201
2202 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2203 {
2204 p->count -= p->pc_count;
2205 p->pc_count = 0;
2206 if (p->count == 0)
2207 *pp = p->next;
2208 else
2209 pp = &p->next;
2210 }
2211 }
2212
2213 if (htab->is_vxworks)
2214 {
2215 struct elf_dyn_relocs **pp;
2216 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2217 {
2218 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2219 *pp = p->next;
2220 else
2221 pp = &p->next;
2222 }
2223 }
2224
2225 /* Also discard relocs on undefined weak syms with non-default
2226 visibility. */
2227 if (eh->dyn_relocs != NULL
2228 && h->root.type == bfd_link_hash_undefweak)
2229 {
2230 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2231 eh->dyn_relocs = NULL;
2232
2233 /* Make sure undefined weak symbols are output as a dynamic
2234 symbol in PIEs. */
2235 else if (h->dynindx == -1
2236 && !h->forced_local)
2237 {
2238 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2239 return FALSE;
2240 }
2241 }
2242 }
2243 else if (ELIMINATE_COPY_RELOCS)
2244 {
2245 /* For the non-shared case, discard space for relocs against
2246 symbols which turn out to need copy relocs or are not
2247 dynamic. */
2248
2249 if (!h->non_got_ref
2250 && ((h->def_dynamic
2251 && !h->def_regular)
2252 || (htab->elf.dynamic_sections_created
2253 && (h->root.type == bfd_link_hash_undefweak
2254 || h->root.type == bfd_link_hash_undefined))))
2255 {
2256 /* Make sure this symbol is output as a dynamic symbol.
2257 Undefined weak syms won't yet be marked as dynamic. */
2258 if (h->dynindx == -1
2259 && !h->forced_local)
2260 {
2261 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2262 return FALSE;
2263 }
2264
2265 /* If that succeeded, we know we'll be keeping all the
2266 relocs. */
2267 if (h->dynindx != -1)
2268 goto keep;
2269 }
2270
2271 eh->dyn_relocs = NULL;
2272
2273 keep: ;
2274 }
2275
2276 /* Finally, allocate space. */
2277 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2278 {
2279 asection *sreloc;
2280
2281 sreloc = elf_section_data (p->sec)->sreloc;
2282
2283 BFD_ASSERT (sreloc != NULL);
2284 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2285 }
2286
2287 return TRUE;
2288 }
2289
2290 /* Allocate space in .plt, .got and associated reloc sections for
2291 local dynamic relocs. */
2292
2293 static bfd_boolean
2294 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2295 {
2296 struct elf_link_hash_entry *h
2297 = (struct elf_link_hash_entry *) *slot;
2298
2299 if (h->type != STT_GNU_IFUNC
2300 || !h->def_regular
2301 || !h->ref_regular
2302 || !h->forced_local
2303 || h->root.type != bfd_link_hash_defined)
2304 abort ();
2305
2306 return elf_i386_allocate_dynrelocs (h, inf);
2307 }
2308
2309 /* Find any dynamic relocs that apply to read-only sections. */
2310
2311 static bfd_boolean
2312 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2313 {
2314 struct elf_i386_link_hash_entry *eh;
2315 struct elf_dyn_relocs *p;
2316
2317 if (h->root.type == bfd_link_hash_warning)
2318 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2319
2320 eh = (struct elf_i386_link_hash_entry *) h;
2321 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2322 {
2323 asection *s = p->sec->output_section;
2324
2325 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2326 {
2327 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2328
2329 info->flags |= DF_TEXTREL;
2330
2331 /* Not an error, just cut short the traversal. */
2332 return FALSE;
2333 }
2334 }
2335 return TRUE;
2336 }
2337
2338 /* Set the sizes of the dynamic sections. */
2339
2340 static bfd_boolean
2341 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2342 struct bfd_link_info *info)
2343 {
2344 struct elf_i386_link_hash_table *htab;
2345 bfd *dynobj;
2346 asection *s;
2347 bfd_boolean relocs;
2348 bfd *ibfd;
2349
2350 htab = elf_i386_hash_table (info);
2351 dynobj = htab->elf.dynobj;
2352 if (dynobj == NULL)
2353 abort ();
2354
2355 if (htab->elf.dynamic_sections_created)
2356 {
2357 /* Set the contents of the .interp section to the interpreter. */
2358 if (info->executable)
2359 {
2360 s = bfd_get_section_by_name (dynobj, ".interp");
2361 if (s == NULL)
2362 abort ();
2363 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2364 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2365 }
2366 }
2367
2368 /* Set up .got offsets for local syms, and space for local dynamic
2369 relocs. */
2370 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2371 {
2372 bfd_signed_vma *local_got;
2373 bfd_signed_vma *end_local_got;
2374 char *local_tls_type;
2375 bfd_vma *local_tlsdesc_gotent;
2376 bfd_size_type locsymcount;
2377 Elf_Internal_Shdr *symtab_hdr;
2378 asection *srel;
2379
2380 if (! is_i386_elf (ibfd))
2381 continue;
2382
2383 for (s = ibfd->sections; s != NULL; s = s->next)
2384 {
2385 struct elf_dyn_relocs *p;
2386
2387 for (p = ((struct elf_dyn_relocs *)
2388 elf_section_data (s)->local_dynrel);
2389 p != NULL;
2390 p = p->next)
2391 {
2392 if (!bfd_is_abs_section (p->sec)
2393 && bfd_is_abs_section (p->sec->output_section))
2394 {
2395 /* Input section has been discarded, either because
2396 it is a copy of a linkonce section or due to
2397 linker script /DISCARD/, so we'll be discarding
2398 the relocs too. */
2399 }
2400 else if (htab->is_vxworks
2401 && strcmp (p->sec->output_section->name,
2402 ".tls_vars") == 0)
2403 {
2404 /* Relocations in vxworks .tls_vars sections are
2405 handled specially by the loader. */
2406 }
2407 else if (p->count != 0)
2408 {
2409 srel = elf_section_data (p->sec)->sreloc;
2410 srel->size += p->count * sizeof (Elf32_External_Rel);
2411 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2412 info->flags |= DF_TEXTREL;
2413 }
2414 }
2415 }
2416
2417 local_got = elf_local_got_refcounts (ibfd);
2418 if (!local_got)
2419 continue;
2420
2421 symtab_hdr = &elf_symtab_hdr (ibfd);
2422 locsymcount = symtab_hdr->sh_info;
2423 end_local_got = local_got + locsymcount;
2424 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2425 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2426 s = htab->elf.sgot;
2427 srel = htab->elf.srelgot;
2428 for (; local_got < end_local_got;
2429 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2430 {
2431 *local_tlsdesc_gotent = (bfd_vma) -1;
2432 if (*local_got > 0)
2433 {
2434 if (GOT_TLS_GDESC_P (*local_tls_type))
2435 {
2436 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2437 - elf_i386_compute_jump_table_size (htab);
2438 htab->elf.sgotplt->size += 8;
2439 *local_got = (bfd_vma) -2;
2440 }
2441 if (! GOT_TLS_GDESC_P (*local_tls_type)
2442 || GOT_TLS_GD_P (*local_tls_type))
2443 {
2444 *local_got = s->size;
2445 s->size += 4;
2446 if (GOT_TLS_GD_P (*local_tls_type)
2447 || *local_tls_type == GOT_TLS_IE_BOTH)
2448 s->size += 4;
2449 }
2450 if (info->shared
2451 || GOT_TLS_GD_ANY_P (*local_tls_type)
2452 || (*local_tls_type & GOT_TLS_IE))
2453 {
2454 if (*local_tls_type == GOT_TLS_IE_BOTH)
2455 srel->size += 2 * sizeof (Elf32_External_Rel);
2456 else if (GOT_TLS_GD_P (*local_tls_type)
2457 || ! GOT_TLS_GDESC_P (*local_tls_type))
2458 srel->size += sizeof (Elf32_External_Rel);
2459 if (GOT_TLS_GDESC_P (*local_tls_type))
2460 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2461 }
2462 }
2463 else
2464 *local_got = (bfd_vma) -1;
2465 }
2466 }
2467
2468 if (htab->tls_ldm_got.refcount > 0)
2469 {
2470 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2471 relocs. */
2472 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2473 htab->elf.sgot->size += 8;
2474 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2475 }
2476 else
2477 htab->tls_ldm_got.offset = -1;
2478
2479 /* Allocate global sym .plt and .got entries, and space for global
2480 sym dynamic relocs. */
2481 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2482
2483 /* Allocate .plt and .got entries, and space for local symbols. */
2484 htab_traverse (htab->loc_hash_table,
2485 elf_i386_allocate_local_dynrelocs,
2486 info);
2487
2488 /* For every jump slot reserved in the sgotplt, reloc_count is
2489 incremented. However, when we reserve space for TLS descriptors,
2490 it's not incremented, so in order to compute the space reserved
2491 for them, it suffices to multiply the reloc count by the jump
2492 slot size. */
2493 if (htab->elf.srelplt)
2494 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2495
2496 /* We now have determined the sizes of the various dynamic sections.
2497 Allocate memory for them. */
2498 relocs = FALSE;
2499 for (s = dynobj->sections; s != NULL; s = s->next)
2500 {
2501 bfd_boolean strip_section = TRUE;
2502
2503 if ((s->flags & SEC_LINKER_CREATED) == 0)
2504 continue;
2505
2506 if (s == htab->elf.splt
2507 || s == htab->elf.sgot
2508 || s == htab->elf.sgotplt
2509 || s == htab->elf.iplt
2510 || s == htab->elf.igotplt
2511 || s == htab->sdynbss)
2512 {
2513 /* Strip this section if we don't need it; see the
2514 comment below. */
2515 /* We'd like to strip these sections if they aren't needed, but if
2516 we've exported dynamic symbols from them we must leave them.
2517 It's too late to tell BFD to get rid of the symbols. */
2518
2519 if (htab->elf.hplt != NULL)
2520 strip_section = FALSE;
2521 }
2522 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2523 {
2524 if (s->size != 0
2525 && s != htab->elf.srelplt
2526 && s != htab->srelplt2)
2527 relocs = TRUE;
2528
2529 /* We use the reloc_count field as a counter if we need
2530 to copy relocs into the output file. */
2531 s->reloc_count = 0;
2532 }
2533 else
2534 {
2535 /* It's not one of our sections, so don't allocate space. */
2536 continue;
2537 }
2538
2539 if (s->size == 0)
2540 {
2541 /* If we don't need this section, strip it from the
2542 output file. This is mostly to handle .rel.bss and
2543 .rel.plt. We must create both sections in
2544 create_dynamic_sections, because they must be created
2545 before the linker maps input sections to output
2546 sections. The linker does that before
2547 adjust_dynamic_symbol is called, and it is that
2548 function which decides whether anything needs to go
2549 into these sections. */
2550 if (strip_section)
2551 s->flags |= SEC_EXCLUDE;
2552 continue;
2553 }
2554
2555 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2556 continue;
2557
2558 /* Allocate memory for the section contents. We use bfd_zalloc
2559 here in case unused entries are not reclaimed before the
2560 section's contents are written out. This should not happen,
2561 but this way if it does, we get a R_386_NONE reloc instead
2562 of garbage. */
2563 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2564 if (s->contents == NULL)
2565 return FALSE;
2566 }
2567
2568 if (htab->elf.dynamic_sections_created)
2569 {
2570 /* Add some entries to the .dynamic section. We fill in the
2571 values later, in elf_i386_finish_dynamic_sections, but we
2572 must add the entries now so that we get the correct size for
2573 the .dynamic section. The DT_DEBUG entry is filled in by the
2574 dynamic linker and used by the debugger. */
2575 #define add_dynamic_entry(TAG, VAL) \
2576 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2577
2578 if (info->executable)
2579 {
2580 if (!add_dynamic_entry (DT_DEBUG, 0))
2581 return FALSE;
2582 }
2583
2584 if (htab->elf.splt->size != 0)
2585 {
2586 if (!add_dynamic_entry (DT_PLTGOT, 0)
2587 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2588 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2589 || !add_dynamic_entry (DT_JMPREL, 0))
2590 return FALSE;
2591 }
2592
2593 if (relocs)
2594 {
2595 if (!add_dynamic_entry (DT_REL, 0)
2596 || !add_dynamic_entry (DT_RELSZ, 0)
2597 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2598 return FALSE;
2599
2600 /* If any dynamic relocs apply to a read-only section,
2601 then we need a DT_TEXTREL entry. */
2602 if ((info->flags & DF_TEXTREL) == 0)
2603 elf_link_hash_traverse (&htab->elf,
2604 elf_i386_readonly_dynrelocs, info);
2605
2606 if ((info->flags & DF_TEXTREL) != 0)
2607 {
2608 if (!add_dynamic_entry (DT_TEXTREL, 0))
2609 return FALSE;
2610 }
2611 }
2612 if (htab->is_vxworks
2613 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2614 return FALSE;
2615 }
2616 #undef add_dynamic_entry
2617
2618 return TRUE;
2619 }
2620
2621 static bfd_boolean
2622 elf_i386_always_size_sections (bfd *output_bfd,
2623 struct bfd_link_info *info)
2624 {
2625 asection *tls_sec = elf_hash_table (info)->tls_sec;
2626
2627 if (tls_sec)
2628 {
2629 struct elf_link_hash_entry *tlsbase;
2630
2631 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2632 "_TLS_MODULE_BASE_",
2633 FALSE, FALSE, FALSE);
2634
2635 if (tlsbase && tlsbase->type == STT_TLS)
2636 {
2637 struct bfd_link_hash_entry *bh = NULL;
2638 const struct elf_backend_data *bed
2639 = get_elf_backend_data (output_bfd);
2640
2641 if (!(_bfd_generic_link_add_one_symbol
2642 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2643 tls_sec, 0, NULL, FALSE,
2644 bed->collect, &bh)))
2645 return FALSE;
2646
2647 elf_i386_hash_table (info)->tls_module_base = bh;
2648
2649 tlsbase = (struct elf_link_hash_entry *)bh;
2650 tlsbase->def_regular = 1;
2651 tlsbase->other = STV_HIDDEN;
2652 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2653 }
2654 }
2655
2656 return TRUE;
2657 }
2658
2659 /* Set the correct type for an x86 ELF section. We do this by the
2660 section name, which is a hack, but ought to work. */
2661
2662 static bfd_boolean
2663 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2664 Elf_Internal_Shdr *hdr,
2665 asection *sec)
2666 {
2667 const char *name;
2668
2669 name = bfd_get_section_name (abfd, sec);
2670
2671 /* This is an ugly, but unfortunately necessary hack that is
2672 needed when producing EFI binaries on x86. It tells
2673 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2674 containing ELF relocation info. We need this hack in order to
2675 be able to generate ELF binaries that can be translated into
2676 EFI applications (which are essentially COFF objects). Those
2677 files contain a COFF ".reloc" section inside an ELFNN object,
2678 which would normally cause BFD to segfault because it would
2679 attempt to interpret this section as containing relocation
2680 entries for section "oc". With this hack enabled, ".reloc"
2681 will be treated as a normal data section, which will avoid the
2682 segfault. However, you won't be able to create an ELFNN binary
2683 with a section named "oc" that needs relocations, but that's
2684 the kind of ugly side-effects you get when detecting section
2685 types based on their names... In practice, this limitation is
2686 unlikely to bite. */
2687 if (strcmp (name, ".reloc") == 0)
2688 hdr->sh_type = SHT_PROGBITS;
2689
2690 return TRUE;
2691 }
2692
2693 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2694 executables. Rather than setting it to the beginning of the TLS
2695 section, we have to set it to the end. This function may be called
2696 multiple times, it is idempotent. */
2697
2698 static void
2699 elf_i386_set_tls_module_base (struct bfd_link_info *info)
2700 {
2701 struct bfd_link_hash_entry *base;
2702
2703 if (!info->executable)
2704 return;
2705
2706 base = elf_i386_hash_table (info)->tls_module_base;
2707
2708 if (!base)
2709 return;
2710
2711 base->u.def.value = elf_hash_table (info)->tls_size;
2712 }
2713
2714 /* Return the base VMA address which should be subtracted from real addresses
2715 when resolving @dtpoff relocation.
2716 This is PT_TLS segment p_vaddr. */
2717
2718 static bfd_vma
2719 elf_i386_dtpoff_base (struct bfd_link_info *info)
2720 {
2721 /* If tls_sec is NULL, we should have signalled an error already. */
2722 if (elf_hash_table (info)->tls_sec == NULL)
2723 return 0;
2724 return elf_hash_table (info)->tls_sec->vma;
2725 }
2726
2727 /* Return the relocation value for @tpoff relocation
2728 if STT_TLS virtual address is ADDRESS. */
2729
2730 static bfd_vma
2731 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2732 {
2733 struct elf_link_hash_table *htab = elf_hash_table (info);
2734
2735 /* If tls_sec is NULL, we should have signalled an error already. */
2736 if (htab->tls_sec == NULL)
2737 return 0;
2738 return htab->tls_size + htab->tls_sec->vma - address;
2739 }
2740
2741 /* Relocate an i386 ELF section. */
2742
2743 static bfd_boolean
2744 elf_i386_relocate_section (bfd *output_bfd,
2745 struct bfd_link_info *info,
2746 bfd *input_bfd,
2747 asection *input_section,
2748 bfd_byte *contents,
2749 Elf_Internal_Rela *relocs,
2750 Elf_Internal_Sym *local_syms,
2751 asection **local_sections)
2752 {
2753 struct elf_i386_link_hash_table *htab;
2754 Elf_Internal_Shdr *symtab_hdr;
2755 struct elf_link_hash_entry **sym_hashes;
2756 bfd_vma *local_got_offsets;
2757 bfd_vma *local_tlsdesc_gotents;
2758 Elf_Internal_Rela *rel;
2759 Elf_Internal_Rela *relend;
2760 bfd_boolean is_vxworks_tls;
2761
2762 BFD_ASSERT (is_i386_elf (input_bfd));
2763
2764 htab = elf_i386_hash_table (info);
2765 symtab_hdr = &elf_symtab_hdr (input_bfd);
2766 sym_hashes = elf_sym_hashes (input_bfd);
2767 local_got_offsets = elf_local_got_offsets (input_bfd);
2768 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2769 /* We have to handle relocations in vxworks .tls_vars sections
2770 specially, because the dynamic loader is 'weird'. */
2771 is_vxworks_tls = (htab->is_vxworks && info->shared
2772 && !strcmp (input_section->output_section->name,
2773 ".tls_vars"));
2774
2775 elf_i386_set_tls_module_base (info);
2776
2777 rel = relocs;
2778 relend = relocs + input_section->reloc_count;
2779 for (; rel < relend; rel++)
2780 {
2781 unsigned int r_type;
2782 reloc_howto_type *howto;
2783 unsigned long r_symndx;
2784 struct elf_link_hash_entry *h;
2785 Elf_Internal_Sym *sym;
2786 asection *sec;
2787 bfd_vma off, offplt;
2788 bfd_vma relocation;
2789 bfd_boolean unresolved_reloc;
2790 bfd_reloc_status_type r;
2791 unsigned int indx;
2792 int tls_type;
2793
2794 r_type = ELF32_R_TYPE (rel->r_info);
2795 if (r_type == R_386_GNU_VTINHERIT
2796 || r_type == R_386_GNU_VTENTRY)
2797 continue;
2798
2799 if ((indx = r_type) >= R_386_standard
2800 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2801 >= R_386_ext - R_386_standard)
2802 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2803 >= R_386_irelative - R_386_ext))
2804 {
2805 (*_bfd_error_handler)
2806 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2807 input_bfd, input_section, r_type);
2808 bfd_set_error (bfd_error_bad_value);
2809 return FALSE;
2810 }
2811 howto = elf_howto_table + indx;
2812
2813 r_symndx = ELF32_R_SYM (rel->r_info);
2814 h = NULL;
2815 sym = NULL;
2816 sec = NULL;
2817 unresolved_reloc = FALSE;
2818 if (r_symndx < symtab_hdr->sh_info)
2819 {
2820 sym = local_syms + r_symndx;
2821 sec = local_sections[r_symndx];
2822 relocation = (sec->output_section->vma
2823 + sec->output_offset
2824 + sym->st_value);
2825
2826 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2827 && ((sec->flags & SEC_MERGE) != 0
2828 || (info->relocatable
2829 && sec->output_offset != 0)))
2830 {
2831 bfd_vma addend;
2832 bfd_byte *where = contents + rel->r_offset;
2833
2834 switch (howto->size)
2835 {
2836 case 0:
2837 addend = bfd_get_8 (input_bfd, where);
2838 if (howto->pc_relative)
2839 {
2840 addend = (addend ^ 0x80) - 0x80;
2841 addend += 1;
2842 }
2843 break;
2844 case 1:
2845 addend = bfd_get_16 (input_bfd, where);
2846 if (howto->pc_relative)
2847 {
2848 addend = (addend ^ 0x8000) - 0x8000;
2849 addend += 2;
2850 }
2851 break;
2852 case 2:
2853 addend = bfd_get_32 (input_bfd, where);
2854 if (howto->pc_relative)
2855 {
2856 addend = (addend ^ 0x80000000) - 0x80000000;
2857 addend += 4;
2858 }
2859 break;
2860 default:
2861 abort ();
2862 }
2863
2864 if (info->relocatable)
2865 addend += sec->output_offset;
2866 else
2867 {
2868 asection *msec = sec;
2869 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2870 addend);
2871 addend -= relocation;
2872 addend += msec->output_section->vma + msec->output_offset;
2873 }
2874
2875 switch (howto->size)
2876 {
2877 case 0:
2878 /* FIXME: overflow checks. */
2879 if (howto->pc_relative)
2880 addend -= 1;
2881 bfd_put_8 (input_bfd, addend, where);
2882 break;
2883 case 1:
2884 if (howto->pc_relative)
2885 addend -= 2;
2886 bfd_put_16 (input_bfd, addend, where);
2887 break;
2888 case 2:
2889 if (howto->pc_relative)
2890 addend -= 4;
2891 bfd_put_32 (input_bfd, addend, where);
2892 break;
2893 }
2894 }
2895 else if (!info->relocatable
2896 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2897 {
2898 /* Relocate against local STT_GNU_IFUNC symbol. */
2899 h = elf_i386_get_local_sym_hash (htab, input_bfd,
2900 rel, FALSE);
2901 if (h == NULL)
2902 abort ();
2903
2904 /* Set STT_GNU_IFUNC symbol value. */
2905 h->root.u.def.value = sym->st_value;
2906 h->root.u.def.section = sec;
2907 }
2908 }
2909 else
2910 {
2911 bfd_boolean warned;
2912
2913 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2914 r_symndx, symtab_hdr, sym_hashes,
2915 h, sec, relocation,
2916 unresolved_reloc, warned);
2917 }
2918
2919 if (sec != NULL && elf_discarded_section (sec))
2920 {
2921 /* For relocs against symbols from removed linkonce sections,
2922 or sections discarded by a linker script, we just want the
2923 section contents zeroed. Avoid any special processing. */
2924 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2925 rel->r_info = 0;
2926 rel->r_addend = 0;
2927 continue;
2928 }
2929
2930 if (info->relocatable)
2931 continue;
2932
2933 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2934 it here if it is defined in a non-shared object. */
2935 if (h != NULL
2936 && h->type == STT_GNU_IFUNC
2937 && h->def_regular)
2938 {
2939 asection *plt, *gotplt, *base_got;
2940 bfd_vma plt_index;
2941 const char *name;
2942
2943 if ((input_section->flags & SEC_ALLOC) == 0
2944 || h->plt.offset == (bfd_vma) -1)
2945 abort ();
2946
2947 /* STT_GNU_IFUNC symbol must go through PLT. */
2948 if (htab->elf.splt != NULL)
2949 {
2950 plt = htab->elf.splt;
2951 gotplt = htab->elf.sgotplt;
2952 }
2953 else
2954 {
2955 plt = htab->elf.iplt;
2956 gotplt = htab->elf.igotplt;
2957 }
2958
2959 relocation = (plt->output_section->vma
2960 + plt->output_offset + h->plt.offset);
2961
2962 switch (r_type)
2963 {
2964 default:
2965 if (h->root.root.string)
2966 name = h->root.root.string;
2967 else
2968 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2969 NULL);
2970 (*_bfd_error_handler)
2971 (_("%B: relocation %s against STT_GNU_IFUNC "
2972 "symbol `%s' isn't handled by %s"), input_bfd,
2973 elf_howto_table[r_type].name,
2974 name, __FUNCTION__);
2975 bfd_set_error (bfd_error_bad_value);
2976 return FALSE;
2977
2978 case R_386_32:
2979 /* Generate dynamic relcoation only when there is a
2980 non-GOF reference in a shared object. */
2981 if (info->shared && h->non_got_ref)
2982 {
2983 Elf_Internal_Rela outrel;
2984 bfd_byte *loc;
2985 asection *sreloc;
2986 bfd_vma offset;
2987
2988 /* Need a dynamic relocation to get the real function
2989 adddress. */
2990 offset = _bfd_elf_section_offset (output_bfd,
2991 info,
2992 input_section,
2993 rel->r_offset);
2994 if (offset == (bfd_vma) -1
2995 || offset == (bfd_vma) -2)
2996 abort ();
2997
2998 outrel.r_offset = (input_section->output_section->vma
2999 + input_section->output_offset
3000 + offset);
3001
3002 if (h->dynindx == -1
3003 || h->forced_local
3004 || info->executable)
3005 {
3006 /* This symbol is resolved locally. */
3007 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3008 bfd_put_32 (output_bfd,
3009 (h->root.u.def.value
3010 + h->root.u.def.section->output_section->vma
3011 + h->root.u.def.section->output_offset),
3012 contents + offset);
3013 }
3014 else
3015 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3016
3017 sreloc = htab->elf.irelifunc;
3018 loc = sreloc->contents;
3019 loc += (sreloc->reloc_count++
3020 * sizeof (Elf32_External_Rel));
3021 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3022
3023 /* If this reloc is against an external symbol, we
3024 do not want to fiddle with the addend. Otherwise,
3025 we need to include the symbol value so that it
3026 becomes an addend for the dynamic reloc. For an
3027 internal symbol, we have updated addend. */
3028 continue;
3029 }
3030
3031 case R_386_PC32:
3032 case R_386_PLT32:
3033 goto do_relocation;
3034
3035 case R_386_GOT32:
3036 base_got = htab->elf.sgot;
3037 off = h->got.offset;
3038
3039 if (base_got == NULL)
3040 abort ();
3041
3042 if (off == (bfd_vma) -1)
3043 {
3044 /* We can't use h->got.offset here to save state, or
3045 even just remember the offset, as finish_dynamic_symbol
3046 would use that as offset into .got. */
3047
3048 if (htab->elf.splt != NULL)
3049 {
3050 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3051 off = (plt_index + 3) * 4;
3052 base_got = htab->elf.sgotplt;
3053 }
3054 else
3055 {
3056 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3057 off = plt_index * 4;
3058 base_got = htab->elf.igotplt;
3059 }
3060
3061 if (h->dynindx == -1
3062 || h->forced_local
3063 || info->symbolic)
3064 {
3065 /* This references the local defitionion. We must
3066 initialize this entry in the global offset table.
3067 Since the offset must always be a multiple of 8,
3068 we use the least significant bit to record
3069 whether we have initialized it already.
3070
3071 When doing a dynamic link, we create a .rela.got
3072 relocation entry to initialize the value. This
3073 is done in the finish_dynamic_symbol routine. */
3074 if ((off & 1) != 0)
3075 off &= ~1;
3076 else
3077 {
3078 bfd_put_32 (output_bfd, relocation,
3079 base_got->contents + off);
3080 h->got.offset |= 1;
3081 }
3082 }
3083
3084 relocation = off;
3085
3086 /* Adjust for static executables. */
3087 if (htab->elf.splt == NULL)
3088 relocation += gotplt->output_offset;
3089 }
3090 else
3091 {
3092 relocation = (base_got->output_section->vma
3093 + base_got->output_offset + off
3094 - gotplt->output_section->vma
3095 - gotplt->output_offset);
3096 /* Adjust for static executables. */
3097 if (htab->elf.splt == NULL)
3098 relocation += gotplt->output_offset;
3099 }
3100
3101 goto do_relocation;
3102
3103 case R_386_GOTOFF:
3104 relocation -= (gotplt->output_section->vma
3105 + gotplt->output_offset);
3106 goto do_relocation;
3107 }
3108 }
3109
3110 switch (r_type)
3111 {
3112 case R_386_GOT32:
3113 /* Relocation is to the entry for this symbol in the global
3114 offset table. */
3115 if (htab->elf.sgot == NULL)
3116 abort ();
3117
3118 if (h != NULL)
3119 {
3120 bfd_boolean dyn;
3121
3122 off = h->got.offset;
3123 dyn = htab->elf.dynamic_sections_created;
3124 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3125 || (info->shared
3126 && SYMBOL_REFERENCES_LOCAL (info, h))
3127 || (ELF_ST_VISIBILITY (h->other)
3128 && h->root.type == bfd_link_hash_undefweak))
3129 {
3130 /* This is actually a static link, or it is a
3131 -Bsymbolic link and the symbol is defined
3132 locally, or the symbol was forced to be local
3133 because of a version file. We must initialize
3134 this entry in the global offset table. Since the
3135 offset must always be a multiple of 4, we use the
3136 least significant bit to record whether we have
3137 initialized it already.
3138
3139 When doing a dynamic link, we create a .rel.got
3140 relocation entry to initialize the value. This
3141 is done in the finish_dynamic_symbol routine. */
3142 if ((off & 1) != 0)
3143 off &= ~1;
3144 else
3145 {
3146 bfd_put_32 (output_bfd, relocation,
3147 htab->elf.sgot->contents + off);
3148 h->got.offset |= 1;
3149 }
3150 }
3151 else
3152 unresolved_reloc = FALSE;
3153 }
3154 else
3155 {
3156 if (local_got_offsets == NULL)
3157 abort ();
3158
3159 off = local_got_offsets[r_symndx];
3160
3161 /* The offset must always be a multiple of 4. We use
3162 the least significant bit to record whether we have
3163 already generated the necessary reloc. */
3164 if ((off & 1) != 0)
3165 off &= ~1;
3166 else
3167 {
3168 bfd_put_32 (output_bfd, relocation,
3169 htab->elf.sgot->contents + off);
3170
3171 if (info->shared)
3172 {
3173 asection *s;
3174 Elf_Internal_Rela outrel;
3175 bfd_byte *loc;
3176
3177 s = htab->elf.srelgot;
3178 if (s == NULL)
3179 abort ();
3180
3181 outrel.r_offset = (htab->elf.sgot->output_section->vma
3182 + htab->elf.sgot->output_offset
3183 + off);
3184 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3185 loc = s->contents;
3186 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3187 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3188 }
3189
3190 local_got_offsets[r_symndx] |= 1;
3191 }
3192 }
3193
3194 if (off >= (bfd_vma) -2)
3195 abort ();
3196
3197 relocation = htab->elf.sgot->output_section->vma
3198 + htab->elf.sgot->output_offset + off
3199 - htab->elf.sgotplt->output_section->vma
3200 - htab->elf.sgotplt->output_offset;
3201 break;
3202
3203 case R_386_GOTOFF:
3204 /* Relocation is relative to the start of the global offset
3205 table. */
3206
3207 /* Check to make sure it isn't a protected function symbol
3208 for shared library since it may not be local when used
3209 as function address. We also need to make sure that a
3210 symbol is defined locally. */
3211 if (info->shared && h)
3212 {
3213 if (!h->def_regular)
3214 {
3215 const char *v;
3216
3217 switch (ELF_ST_VISIBILITY (h->other))
3218 {
3219 case STV_HIDDEN:
3220 v = _("hidden symbol");
3221 break;
3222 case STV_INTERNAL:
3223 v = _("internal symbol");
3224 break;
3225 case STV_PROTECTED:
3226 v = _("protected symbol");
3227 break;
3228 default:
3229 v = _("symbol");
3230 break;
3231 }
3232
3233 (*_bfd_error_handler)
3234 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3235 input_bfd, v, h->root.root.string);
3236 bfd_set_error (bfd_error_bad_value);
3237 return FALSE;
3238 }
3239 else if (!info->executable
3240 && h->type == STT_FUNC
3241 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3242 {
3243 (*_bfd_error_handler)
3244 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3245 input_bfd, h->root.root.string);
3246 bfd_set_error (bfd_error_bad_value);
3247 return FALSE;
3248 }
3249 }
3250
3251 /* Note that sgot is not involved in this
3252 calculation. We always want the start of .got.plt. If we
3253 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3254 permitted by the ABI, we might have to change this
3255 calculation. */
3256 relocation -= htab->elf.sgotplt->output_section->vma
3257 + htab->elf.sgotplt->output_offset;
3258 break;
3259
3260 case R_386_GOTPC:
3261 /* Use global offset table as symbol value. */
3262 relocation = htab->elf.sgotplt->output_section->vma
3263 + htab->elf.sgotplt->output_offset;
3264 unresolved_reloc = FALSE;
3265 break;
3266
3267 case R_386_PLT32:
3268 /* Relocation is to the entry for this symbol in the
3269 procedure linkage table. */
3270
3271 /* Resolve a PLT32 reloc against a local symbol directly,
3272 without using the procedure linkage table. */
3273 if (h == NULL)
3274 break;
3275
3276 if (h->plt.offset == (bfd_vma) -1
3277 || htab->elf.splt == NULL)
3278 {
3279 /* We didn't make a PLT entry for this symbol. This
3280 happens when statically linking PIC code, or when
3281 using -Bsymbolic. */
3282 break;
3283 }
3284
3285 relocation = (htab->elf.splt->output_section->vma
3286 + htab->elf.splt->output_offset
3287 + h->plt.offset);
3288 unresolved_reloc = FALSE;
3289 break;
3290
3291 case R_386_32:
3292 case R_386_PC32:
3293 if ((input_section->flags & SEC_ALLOC) == 0
3294 || is_vxworks_tls)
3295 break;
3296
3297 if ((info->shared
3298 && (h == NULL
3299 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3300 || h->root.type != bfd_link_hash_undefweak)
3301 && (r_type != R_386_PC32
3302 || !SYMBOL_CALLS_LOCAL (info, h)))
3303 || (ELIMINATE_COPY_RELOCS
3304 && !info->shared
3305 && h != NULL
3306 && h->dynindx != -1
3307 && !h->non_got_ref
3308 && ((h->def_dynamic
3309 && !h->def_regular)
3310 || h->root.type == bfd_link_hash_undefweak
3311 || h->root.type == bfd_link_hash_undefined)))
3312 {
3313 Elf_Internal_Rela outrel;
3314 bfd_byte *loc;
3315 bfd_boolean skip, relocate;
3316 asection *sreloc;
3317
3318 /* When generating a shared object, these relocations
3319 are copied into the output file to be resolved at run
3320 time. */
3321
3322 skip = FALSE;
3323 relocate = FALSE;
3324
3325 outrel.r_offset =
3326 _bfd_elf_section_offset (output_bfd, info, input_section,
3327 rel->r_offset);
3328 if (outrel.r_offset == (bfd_vma) -1)
3329 skip = TRUE;
3330 else if (outrel.r_offset == (bfd_vma) -2)
3331 skip = TRUE, relocate = TRUE;
3332 outrel.r_offset += (input_section->output_section->vma
3333 + input_section->output_offset);
3334
3335 if (skip)
3336 memset (&outrel, 0, sizeof outrel);
3337 else if (h != NULL
3338 && h->dynindx != -1
3339 && (r_type == R_386_PC32
3340 || !info->shared
3341 || !SYMBOLIC_BIND (info, h)
3342 || !h->def_regular))
3343 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3344 else
3345 {
3346 /* This symbol is local, or marked to become local. */
3347 relocate = TRUE;
3348 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3349 }
3350
3351 sreloc = elf_section_data (input_section)->sreloc;
3352
3353 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3354
3355 loc = sreloc->contents;
3356 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3357
3358 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3359
3360 /* If this reloc is against an external symbol, we do
3361 not want to fiddle with the addend. Otherwise, we
3362 need to include the symbol value so that it becomes
3363 an addend for the dynamic reloc. */
3364 if (! relocate)
3365 continue;
3366 }
3367 break;
3368
3369 case R_386_TLS_IE:
3370 if (!info->executable)
3371 {
3372 Elf_Internal_Rela outrel;
3373 bfd_byte *loc;
3374 asection *sreloc;
3375
3376 outrel.r_offset = rel->r_offset
3377 + input_section->output_section->vma
3378 + input_section->output_offset;
3379 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3380 sreloc = elf_section_data (input_section)->sreloc;
3381 if (sreloc == NULL)
3382 abort ();
3383 loc = sreloc->contents;
3384 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3385 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3386 }
3387 /* Fall through */
3388
3389 case R_386_TLS_GD:
3390 case R_386_TLS_GOTDESC:
3391 case R_386_TLS_DESC_CALL:
3392 case R_386_TLS_IE_32:
3393 case R_386_TLS_GOTIE:
3394 tls_type = GOT_UNKNOWN;
3395 if (h == NULL && local_got_offsets)
3396 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3397 else if (h != NULL)
3398 tls_type = elf_i386_hash_entry(h)->tls_type;
3399 if (tls_type == GOT_TLS_IE)
3400 tls_type = GOT_TLS_IE_NEG;
3401
3402 if (! elf_i386_tls_transition (info, input_bfd,
3403 input_section, contents,
3404 symtab_hdr, sym_hashes,
3405 &r_type, tls_type, rel,
3406 relend, h, r_symndx))
3407 return FALSE;
3408
3409 if (r_type == R_386_TLS_LE_32)
3410 {
3411 BFD_ASSERT (! unresolved_reloc);
3412 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3413 {
3414 unsigned int type;
3415 bfd_vma roff;
3416
3417 /* GD->LE transition. */
3418 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3419 if (type == 0x04)
3420 {
3421 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3422 Change it into:
3423 movl %gs:0, %eax; subl $foo@tpoff, %eax
3424 (6 byte form of subl). */
3425 memcpy (contents + rel->r_offset - 3,
3426 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3427 roff = rel->r_offset + 5;
3428 }
3429 else
3430 {
3431 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3432 Change it into:
3433 movl %gs:0, %eax; subl $foo@tpoff, %eax
3434 (6 byte form of subl). */
3435 memcpy (contents + rel->r_offset - 2,
3436 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3437 roff = rel->r_offset + 6;
3438 }
3439 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3440 contents + roff);
3441 /* Skip R_386_PC32/R_386_PLT32. */
3442 rel++;
3443 continue;
3444 }
3445 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3446 {
3447 /* GDesc -> LE transition.
3448 It's originally something like:
3449 leal x@tlsdesc(%ebx), %eax
3450
3451 leal x@ntpoff, %eax
3452
3453 Registers other than %eax may be set up here. */
3454
3455 unsigned int val;
3456 bfd_vma roff;
3457
3458 roff = rel->r_offset;
3459 val = bfd_get_8 (input_bfd, contents + roff - 1);
3460
3461 /* Now modify the instruction as appropriate. */
3462 /* aoliva FIXME: remove the above and xor the byte
3463 below with 0x86. */
3464 bfd_put_8 (output_bfd, val ^ 0x86,
3465 contents + roff - 1);
3466 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3467 contents + roff);
3468 continue;
3469 }
3470 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3471 {
3472 /* GDesc -> LE transition.
3473 It's originally:
3474 call *(%eax)
3475 Turn it into:
3476 xchg %ax,%ax */
3477
3478 bfd_vma roff;
3479
3480 roff = rel->r_offset;
3481 bfd_put_8 (output_bfd, 0x66, contents + roff);
3482 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3483 continue;
3484 }
3485 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3486 {
3487 unsigned int val;
3488
3489 /* IE->LE transition:
3490 Originally it can be one of:
3491 movl foo, %eax
3492 movl foo, %reg
3493 addl foo, %reg
3494 We change it into:
3495 movl $foo, %eax
3496 movl $foo, %reg
3497 addl $foo, %reg. */
3498 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3499 if (val == 0xa1)
3500 {
3501 /* movl foo, %eax. */
3502 bfd_put_8 (output_bfd, 0xb8,
3503 contents + rel->r_offset - 1);
3504 }
3505 else
3506 {
3507 unsigned int type;
3508
3509 type = bfd_get_8 (input_bfd,
3510 contents + rel->r_offset - 2);
3511 switch (type)
3512 {
3513 case 0x8b:
3514 /* movl */
3515 bfd_put_8 (output_bfd, 0xc7,
3516 contents + rel->r_offset - 2);
3517 bfd_put_8 (output_bfd,
3518 0xc0 | ((val >> 3) & 7),
3519 contents + rel->r_offset - 1);
3520 break;
3521 case 0x03:
3522 /* addl */
3523 bfd_put_8 (output_bfd, 0x81,
3524 contents + rel->r_offset - 2);
3525 bfd_put_8 (output_bfd,
3526 0xc0 | ((val >> 3) & 7),
3527 contents + rel->r_offset - 1);
3528 break;
3529 default:
3530 BFD_FAIL ();
3531 break;
3532 }
3533 }
3534 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3535 contents + rel->r_offset);
3536 continue;
3537 }
3538 else
3539 {
3540 unsigned int val, type;
3541
3542 /* {IE_32,GOTIE}->LE transition:
3543 Originally it can be one of:
3544 subl foo(%reg1), %reg2
3545 movl foo(%reg1), %reg2
3546 addl foo(%reg1), %reg2
3547 We change it into:
3548 subl $foo, %reg2
3549 movl $foo, %reg2 (6 byte form)
3550 addl $foo, %reg2. */
3551 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3552 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3553 if (type == 0x8b)
3554 {
3555 /* movl */
3556 bfd_put_8 (output_bfd, 0xc7,
3557 contents + rel->r_offset - 2);
3558 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3559 contents + rel->r_offset - 1);
3560 }
3561 else if (type == 0x2b)
3562 {
3563 /* subl */
3564 bfd_put_8 (output_bfd, 0x81,
3565 contents + rel->r_offset - 2);
3566 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3567 contents + rel->r_offset - 1);
3568 }
3569 else if (type == 0x03)
3570 {
3571 /* addl */
3572 bfd_put_8 (output_bfd, 0x81,
3573 contents + rel->r_offset - 2);
3574 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3575 contents + rel->r_offset - 1);
3576 }
3577 else
3578 BFD_FAIL ();
3579 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3580 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3581 contents + rel->r_offset);
3582 else
3583 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3584 contents + rel->r_offset);
3585 continue;
3586 }
3587 }
3588
3589 if (htab->elf.sgot == NULL)
3590 abort ();
3591
3592 if (h != NULL)
3593 {
3594 off = h->got.offset;
3595 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3596 }
3597 else
3598 {
3599 if (local_got_offsets == NULL)
3600 abort ();
3601
3602 off = local_got_offsets[r_symndx];
3603 offplt = local_tlsdesc_gotents[r_symndx];
3604 }
3605
3606 if ((off & 1) != 0)
3607 off &= ~1;
3608 else
3609 {
3610 Elf_Internal_Rela outrel;
3611 bfd_byte *loc;
3612 int dr_type;
3613 asection *sreloc;
3614
3615 if (htab->elf.srelgot == NULL)
3616 abort ();
3617
3618 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3619
3620 if (GOT_TLS_GDESC_P (tls_type))
3621 {
3622 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3623 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3624 <= htab->elf.sgotplt->size);
3625 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3626 + htab->elf.sgotplt->output_offset
3627 + offplt
3628 + htab->sgotplt_jump_table_size);
3629 sreloc = htab->elf.srelplt;
3630 loc = sreloc->contents;
3631 loc += (htab->next_tls_desc_index++
3632 * sizeof (Elf32_External_Rel));
3633 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3634 <= sreloc->contents + sreloc->size);
3635 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3636 if (indx == 0)
3637 {
3638 BFD_ASSERT (! unresolved_reloc);
3639 bfd_put_32 (output_bfd,
3640 relocation - elf_i386_dtpoff_base (info),
3641 htab->elf.sgotplt->contents + offplt
3642 + htab->sgotplt_jump_table_size + 4);
3643 }
3644 else
3645 {
3646 bfd_put_32 (output_bfd, 0,
3647 htab->elf.sgotplt->contents + offplt
3648 + htab->sgotplt_jump_table_size + 4);
3649 }
3650 }
3651
3652 sreloc = htab->elf.srelgot;
3653
3654 outrel.r_offset = (htab->elf.sgot->output_section->vma
3655 + htab->elf.sgot->output_offset + off);
3656
3657 if (GOT_TLS_GD_P (tls_type))
3658 dr_type = R_386_TLS_DTPMOD32;
3659 else if (GOT_TLS_GDESC_P (tls_type))
3660 goto dr_done;
3661 else if (tls_type == GOT_TLS_IE_POS)
3662 dr_type = R_386_TLS_TPOFF;
3663 else
3664 dr_type = R_386_TLS_TPOFF32;
3665
3666 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3667 bfd_put_32 (output_bfd,
3668 relocation - elf_i386_dtpoff_base (info),
3669 htab->elf.sgot->contents + off);
3670 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3671 bfd_put_32 (output_bfd,
3672 elf_i386_dtpoff_base (info) - relocation,
3673 htab->elf.sgot->contents + off);
3674 else if (dr_type != R_386_TLS_DESC)
3675 bfd_put_32 (output_bfd, 0,
3676 htab->elf.sgot->contents + off);
3677 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3678
3679 loc = sreloc->contents;
3680 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3681 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3682 <= sreloc->contents + sreloc->size);
3683 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3684
3685 if (GOT_TLS_GD_P (tls_type))
3686 {
3687 if (indx == 0)
3688 {
3689 BFD_ASSERT (! unresolved_reloc);
3690 bfd_put_32 (output_bfd,
3691 relocation - elf_i386_dtpoff_base (info),
3692 htab->elf.sgot->contents + off + 4);
3693 }
3694 else
3695 {
3696 bfd_put_32 (output_bfd, 0,
3697 htab->elf.sgot->contents + off + 4);
3698 outrel.r_info = ELF32_R_INFO (indx,
3699 R_386_TLS_DTPOFF32);
3700 outrel.r_offset += 4;
3701 sreloc->reloc_count++;
3702 loc += sizeof (Elf32_External_Rel);
3703 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3704 <= sreloc->contents + sreloc->size);
3705 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3706 }
3707 }
3708 else if (tls_type == GOT_TLS_IE_BOTH)
3709 {
3710 bfd_put_32 (output_bfd,
3711 (indx == 0
3712 ? relocation - elf_i386_dtpoff_base (info)
3713 : 0),
3714 htab->elf.sgot->contents + off + 4);
3715 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3716 outrel.r_offset += 4;
3717 sreloc->reloc_count++;
3718 loc += sizeof (Elf32_External_Rel);
3719 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3720 }
3721
3722 dr_done:
3723 if (h != NULL)
3724 h->got.offset |= 1;
3725 else
3726 local_got_offsets[r_symndx] |= 1;
3727 }
3728
3729 if (off >= (bfd_vma) -2
3730 && ! GOT_TLS_GDESC_P (tls_type))
3731 abort ();
3732 if (r_type == R_386_TLS_GOTDESC
3733 || r_type == R_386_TLS_DESC_CALL)
3734 {
3735 relocation = htab->sgotplt_jump_table_size + offplt;
3736 unresolved_reloc = FALSE;
3737 }
3738 else if (r_type == ELF32_R_TYPE (rel->r_info))
3739 {
3740 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3741 + htab->elf.sgotplt->output_offset;
3742 relocation = htab->elf.sgot->output_section->vma
3743 + htab->elf.sgot->output_offset + off - g_o_t;
3744 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3745 && tls_type == GOT_TLS_IE_BOTH)
3746 relocation += 4;
3747 if (r_type == R_386_TLS_IE)
3748 relocation += g_o_t;
3749 unresolved_reloc = FALSE;
3750 }
3751 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3752 {
3753 unsigned int val, type;
3754 bfd_vma roff;
3755
3756 /* GD->IE transition. */
3757 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3758 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3759 if (type == 0x04)
3760 {
3761 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3762 Change it into:
3763 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3764 val >>= 3;
3765 roff = rel->r_offset - 3;
3766 }
3767 else
3768 {
3769 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3770 Change it into:
3771 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3772 roff = rel->r_offset - 2;
3773 }
3774 memcpy (contents + roff,
3775 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3776 contents[roff + 7] = 0x80 | (val & 7);
3777 /* If foo is used only with foo@gotntpoff(%reg) and
3778 foo@indntpoff, but not with foo@gottpoff(%reg), change
3779 subl $foo@gottpoff(%reg), %eax
3780 into:
3781 addl $foo@gotntpoff(%reg), %eax. */
3782 if (tls_type == GOT_TLS_IE_POS)
3783 contents[roff + 6] = 0x03;
3784 bfd_put_32 (output_bfd,
3785 htab->elf.sgot->output_section->vma
3786 + htab->elf.sgot->output_offset + off
3787 - htab->elf.sgotplt->output_section->vma
3788 - htab->elf.sgotplt->output_offset,
3789 contents + roff + 8);
3790 /* Skip R_386_PLT32. */
3791 rel++;
3792 continue;
3793 }
3794 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3795 {
3796 /* GDesc -> IE transition.
3797 It's originally something like:
3798 leal x@tlsdesc(%ebx), %eax
3799
3800 Change it to:
3801 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3802 or:
3803 movl x@gottpoff(%ebx), %eax # before negl %eax
3804
3805 Registers other than %eax may be set up here. */
3806
3807 bfd_vma roff;
3808
3809 /* First, make sure it's a leal adding ebx to a 32-bit
3810 offset into any register, although it's probably
3811 almost always going to be eax. */
3812 roff = rel->r_offset;
3813
3814 /* Now modify the instruction as appropriate. */
3815 /* To turn a leal into a movl in the form we use it, it
3816 suffices to change the first byte from 0x8d to 0x8b.
3817 aoliva FIXME: should we decide to keep the leal, all
3818 we have to do is remove the statement below, and
3819 adjust the relaxation of R_386_TLS_DESC_CALL. */
3820 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3821
3822 if (tls_type == GOT_TLS_IE_BOTH)
3823 off += 4;
3824
3825 bfd_put_32 (output_bfd,
3826 htab->elf.sgot->output_section->vma
3827 + htab->elf.sgot->output_offset + off
3828 - htab->elf.sgotplt->output_section->vma
3829 - htab->elf.sgotplt->output_offset,
3830 contents + roff);
3831 continue;
3832 }
3833 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3834 {
3835 /* GDesc -> IE transition.
3836 It's originally:
3837 call *(%eax)
3838
3839 Change it to:
3840 xchg %ax,%ax
3841 or
3842 negl %eax
3843 depending on how we transformed the TLS_GOTDESC above.
3844 */
3845
3846 bfd_vma roff;
3847
3848 roff = rel->r_offset;
3849
3850 /* Now modify the instruction as appropriate. */
3851 if (tls_type != GOT_TLS_IE_NEG)
3852 {
3853 /* xchg %ax,%ax */
3854 bfd_put_8 (output_bfd, 0x66, contents + roff);
3855 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3856 }
3857 else
3858 {
3859 /* negl %eax */
3860 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3861 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3862 }
3863
3864 continue;
3865 }
3866 else
3867 BFD_ASSERT (FALSE);
3868 break;
3869
3870 case R_386_TLS_LDM:
3871 if (! elf_i386_tls_transition (info, input_bfd,
3872 input_section, contents,
3873 symtab_hdr, sym_hashes,
3874 &r_type, GOT_UNKNOWN, rel,
3875 relend, h, r_symndx))
3876 return FALSE;
3877
3878 if (r_type != R_386_TLS_LDM)
3879 {
3880 /* LD->LE transition:
3881 leal foo(%reg), %eax; call ___tls_get_addr.
3882 We change it into:
3883 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3884 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3885 memcpy (contents + rel->r_offset - 2,
3886 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3887 /* Skip R_386_PC32/R_386_PLT32. */
3888 rel++;
3889 continue;
3890 }
3891
3892 if (htab->elf.sgot == NULL)
3893 abort ();
3894
3895 off = htab->tls_ldm_got.offset;
3896 if (off & 1)
3897 off &= ~1;
3898 else
3899 {
3900 Elf_Internal_Rela outrel;
3901 bfd_byte *loc;
3902
3903 if (htab->elf.srelgot == NULL)
3904 abort ();
3905
3906 outrel.r_offset = (htab->elf.sgot->output_section->vma
3907 + htab->elf.sgot->output_offset + off);
3908
3909 bfd_put_32 (output_bfd, 0,
3910 htab->elf.sgot->contents + off);
3911 bfd_put_32 (output_bfd, 0,
3912 htab->elf.sgot->contents + off + 4);
3913 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3914 loc = htab->elf.srelgot->contents;
3915 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3916 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3917 htab->tls_ldm_got.offset |= 1;
3918 }
3919 relocation = htab->elf.sgot->output_section->vma
3920 + htab->elf.sgot->output_offset + off
3921 - htab->elf.sgotplt->output_section->vma
3922 - htab->elf.sgotplt->output_offset;
3923 unresolved_reloc = FALSE;
3924 break;
3925
3926 case R_386_TLS_LDO_32:
3927 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3928 relocation -= elf_i386_dtpoff_base (info);
3929 else
3930 /* When converting LDO to LE, we must negate. */
3931 relocation = -elf_i386_tpoff (info, relocation);
3932 break;
3933
3934 case R_386_TLS_LE_32:
3935 case R_386_TLS_LE:
3936 if (!info->executable)
3937 {
3938 Elf_Internal_Rela outrel;
3939 asection *sreloc;
3940 bfd_byte *loc;
3941
3942 outrel.r_offset = rel->r_offset
3943 + input_section->output_section->vma
3944 + input_section->output_offset;
3945 if (h != NULL && h->dynindx != -1)
3946 indx = h->dynindx;
3947 else
3948 indx = 0;
3949 if (r_type == R_386_TLS_LE_32)
3950 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3951 else
3952 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3953 sreloc = elf_section_data (input_section)->sreloc;
3954 if (sreloc == NULL)
3955 abort ();
3956 loc = sreloc->contents;
3957 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3958 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3959 if (indx)
3960 continue;
3961 else if (r_type == R_386_TLS_LE_32)
3962 relocation = elf_i386_dtpoff_base (info) - relocation;
3963 else
3964 relocation -= elf_i386_dtpoff_base (info);
3965 }
3966 else if (r_type == R_386_TLS_LE_32)
3967 relocation = elf_i386_tpoff (info, relocation);
3968 else
3969 relocation = -elf_i386_tpoff (info, relocation);
3970 break;
3971
3972 default:
3973 break;
3974 }
3975
3976 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3977 because such sections are not SEC_ALLOC and thus ld.so will
3978 not process them. */
3979 if (unresolved_reloc
3980 && !((input_section->flags & SEC_DEBUGGING) != 0
3981 && h->def_dynamic))
3982 {
3983 (*_bfd_error_handler)
3984 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3985 input_bfd,
3986 input_section,
3987 (long) rel->r_offset,
3988 howto->name,
3989 h->root.root.string);
3990 return FALSE;
3991 }
3992
3993 do_relocation:
3994 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3995 contents, rel->r_offset,
3996 relocation, 0);
3997
3998 if (r != bfd_reloc_ok)
3999 {
4000 const char *name;
4001
4002 if (h != NULL)
4003 name = h->root.root.string;
4004 else
4005 {
4006 name = bfd_elf_string_from_elf_section (input_bfd,
4007 symtab_hdr->sh_link,
4008 sym->st_name);
4009 if (name == NULL)
4010 return FALSE;
4011 if (*name == '\0')
4012 name = bfd_section_name (input_bfd, sec);
4013 }
4014
4015 if (r == bfd_reloc_overflow)
4016 {
4017 if (! ((*info->callbacks->reloc_overflow)
4018 (info, (h ? &h->root : NULL), name, howto->name,
4019 (bfd_vma) 0, input_bfd, input_section,
4020 rel->r_offset)))
4021 return FALSE;
4022 }
4023 else
4024 {
4025 (*_bfd_error_handler)
4026 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4027 input_bfd, input_section,
4028 (long) rel->r_offset, name, (int) r);
4029 return FALSE;
4030 }
4031 }
4032 }
4033
4034 return TRUE;
4035 }
4036
4037 /* Finish up dynamic symbol handling. We set the contents of various
4038 dynamic sections here. */
4039
4040 static bfd_boolean
4041 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4042 struct bfd_link_info *info,
4043 struct elf_link_hash_entry *h,
4044 Elf_Internal_Sym *sym)
4045 {
4046 struct elf_i386_link_hash_table *htab;
4047
4048 htab = elf_i386_hash_table (info);
4049
4050 if (h->plt.offset != (bfd_vma) -1)
4051 {
4052 bfd_vma plt_index;
4053 bfd_vma got_offset;
4054 Elf_Internal_Rela rel;
4055 bfd_byte *loc;
4056 asection *plt, *gotplt, *relplt;
4057
4058 /* When building a static executable, use .iplt, .igot.plt and
4059 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4060 if (htab->elf.splt != NULL)
4061 {
4062 plt = htab->elf.splt;
4063 gotplt = htab->elf.sgotplt;
4064 relplt = htab->elf.srelplt;
4065 }
4066 else
4067 {
4068 plt = htab->elf.iplt;
4069 gotplt = htab->elf.igotplt;
4070 relplt = htab->elf.irelplt;
4071 }
4072
4073 /* This symbol has an entry in the procedure linkage table. Set
4074 it up. */
4075
4076 if ((h->dynindx == -1
4077 && !((h->forced_local || info->executable)
4078 && h->def_regular
4079 && h->type == STT_GNU_IFUNC))
4080 || plt == NULL
4081 || gotplt == NULL
4082 || relplt == NULL)
4083 abort ();
4084
4085 /* Get the index in the procedure linkage table which
4086 corresponds to this symbol. This is the index of this symbol
4087 in all the symbols for which we are making plt entries. The
4088 first entry in the procedure linkage table is reserved.
4089
4090 Get the offset into the .got table of the entry that
4091 corresponds to this function. Each .got entry is 4 bytes.
4092 The first three are reserved.
4093
4094 For static executables, we don't reserve anything. */
4095
4096 if (plt == htab->elf.splt)
4097 {
4098 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
4099 got_offset = (plt_index + 3) * 4;
4100 }
4101 else
4102 {
4103 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
4104 got_offset = plt_index * 4;
4105 }
4106
4107 /* Fill in the entry in the procedure linkage table. */
4108 if (! info->shared)
4109 {
4110 memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry,
4111 PLT_ENTRY_SIZE);
4112 bfd_put_32 (output_bfd,
4113 (gotplt->output_section->vma
4114 + gotplt->output_offset
4115 + got_offset),
4116 plt->contents + h->plt.offset + 2);
4117
4118 if (htab->is_vxworks)
4119 {
4120 int s, k, reloc_index;
4121
4122 /* Create the R_386_32 relocation referencing the GOT
4123 for this PLT entry. */
4124
4125 /* S: Current slot number (zero-based). */
4126 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
4127 /* K: Number of relocations for PLTResolve. */
4128 if (info->shared)
4129 k = PLTRESOLVE_RELOCS_SHLIB;
4130 else
4131 k = PLTRESOLVE_RELOCS;
4132 /* Skip the PLTresolve relocations, and the relocations for
4133 the other PLT slots. */
4134 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4135 loc = (htab->srelplt2->contents + reloc_index
4136 * sizeof (Elf32_External_Rel));
4137
4138 rel.r_offset = (htab->elf.splt->output_section->vma
4139 + htab->elf.splt->output_offset
4140 + h->plt.offset + 2),
4141 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4142 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4143
4144 /* Create the R_386_32 relocation referencing the beginning of
4145 the PLT for this GOT entry. */
4146 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4147 + htab->elf.sgotplt->output_offset
4148 + got_offset);
4149 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4150 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4151 loc + sizeof (Elf32_External_Rel));
4152 }
4153 }
4154 else
4155 {
4156 memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry,
4157 PLT_ENTRY_SIZE);
4158 bfd_put_32 (output_bfd, got_offset,
4159 plt->contents + h->plt.offset + 2);
4160 }
4161
4162 /* Don't fill PLT entry for static executables. */
4163 if (plt == htab->elf.splt)
4164 {
4165 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4166 plt->contents + h->plt.offset + 7);
4167 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
4168 plt->contents + h->plt.offset + 12);
4169 }
4170
4171 /* Fill in the entry in the global offset table. */
4172 bfd_put_32 (output_bfd,
4173 (plt->output_section->vma
4174 + plt->output_offset
4175 + h->plt.offset
4176 + 6),
4177 gotplt->contents + got_offset);
4178
4179 /* Fill in the entry in the .rel.plt section. */
4180 rel.r_offset = (gotplt->output_section->vma
4181 + gotplt->output_offset
4182 + got_offset);
4183 if (h->dynindx == -1
4184 || ((info->executable
4185 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4186 && h->def_regular
4187 && h->type == STT_GNU_IFUNC))
4188 {
4189 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4190 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4191 in the .got.plt section. */
4192 bfd_put_32 (output_bfd,
4193 (h->root.u.def.value
4194 + h->root.u.def.section->output_section->vma
4195 + h->root.u.def.section->output_offset),
4196 gotplt->contents + got_offset);
4197 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4198 }
4199 else
4200 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4201 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4202 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4203
4204 if (!h->def_regular)
4205 {
4206 /* Mark the symbol as undefined, rather than as defined in
4207 the .plt section. Leave the value if there were any
4208 relocations where pointer equality matters (this is a clue
4209 for the dynamic linker, to make function pointer
4210 comparisons work between an application and shared
4211 library), otherwise set it to zero. If a function is only
4212 called from a binary, there is no need to slow down
4213 shared libraries because of that. */
4214 sym->st_shndx = SHN_UNDEF;
4215 if (!h->pointer_equality_needed)
4216 sym->st_value = 0;
4217 }
4218 }
4219
4220 if (h->got.offset != (bfd_vma) -1
4221 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4222 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4223 {
4224 Elf_Internal_Rela rel;
4225 bfd_byte *loc;
4226
4227 /* This symbol has an entry in the global offset table. Set it
4228 up. */
4229
4230 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4231 abort ();
4232
4233 rel.r_offset = (htab->elf.sgot->output_section->vma
4234 + htab->elf.sgot->output_offset
4235 + (h->got.offset & ~(bfd_vma) 1));
4236
4237 /* If this is a static link, or it is a -Bsymbolic link and the
4238 symbol is defined locally or was forced to be local because
4239 of a version file, we just want to emit a RELATIVE reloc.
4240 The entry in the global offset table will already have been
4241 initialized in the relocate_section function. */
4242 if (h->def_regular
4243 && h->type == STT_GNU_IFUNC)
4244 {
4245 if (info->shared)
4246 {
4247 /* Generate R_386_GLOB_DAT. */
4248 goto do_glob_dat;
4249 }
4250 else
4251 {
4252 asection *plt;
4253
4254 if (!h->pointer_equality_needed)
4255 abort ();
4256
4257 /* For non-shared object, we can't use .got.plt, which
4258 contains the real function addres if we need pointer
4259 equality. We load the GOT entry with the PLT entry. */
4260 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4261 bfd_put_32 (output_bfd,
4262 (plt->output_section->vma
4263 + plt->output_offset + h->plt.offset),
4264 htab->elf.sgot->contents + h->got.offset);
4265 return TRUE;
4266 }
4267 }
4268 else if (info->shared
4269 && SYMBOL_REFERENCES_LOCAL (info, h))
4270 {
4271 BFD_ASSERT((h->got.offset & 1) != 0);
4272 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4273 }
4274 else
4275 {
4276 BFD_ASSERT((h->got.offset & 1) == 0);
4277 do_glob_dat:
4278 bfd_put_32 (output_bfd, (bfd_vma) 0,
4279 htab->elf.sgot->contents + h->got.offset);
4280 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4281 }
4282
4283 loc = htab->elf.srelgot->contents;
4284 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4285 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4286 }
4287
4288 if (h->needs_copy)
4289 {
4290 Elf_Internal_Rela rel;
4291 bfd_byte *loc;
4292
4293 /* This symbol needs a copy reloc. Set it up. */
4294
4295 if (h->dynindx == -1
4296 || (h->root.type != bfd_link_hash_defined
4297 && h->root.type != bfd_link_hash_defweak)
4298 || htab->srelbss == NULL)
4299 abort ();
4300
4301 rel.r_offset = (h->root.u.def.value
4302 + h->root.u.def.section->output_section->vma
4303 + h->root.u.def.section->output_offset);
4304 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4305 loc = htab->srelbss->contents;
4306 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4307 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4308 }
4309
4310 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4311 be NULL for local symbols.
4312
4313 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4314 is relative to the ".got" section. */
4315 if (sym != NULL
4316 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4317 || (!htab->is_vxworks && h == htab->elf.hgot)))
4318 sym->st_shndx = SHN_ABS;
4319
4320 return TRUE;
4321 }
4322
4323 /* Finish up local dynamic symbol handling. We set the contents of
4324 various dynamic sections here. */
4325
4326 static bfd_boolean
4327 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4328 {
4329 struct elf_link_hash_entry *h
4330 = (struct elf_link_hash_entry *) *slot;
4331 struct bfd_link_info *info
4332 = (struct bfd_link_info *) inf;
4333
4334 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4335 h, NULL);
4336 }
4337
4338 /* Used to decide how to sort relocs in an optimal manner for the
4339 dynamic linker, before writing them out. */
4340
4341 static enum elf_reloc_type_class
4342 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4343 {
4344 switch (ELF32_R_TYPE (rela->r_info))
4345 {
4346 case R_386_RELATIVE:
4347 return reloc_class_relative;
4348 case R_386_JUMP_SLOT:
4349 return reloc_class_plt;
4350 case R_386_COPY:
4351 return reloc_class_copy;
4352 default:
4353 return reloc_class_normal;
4354 }
4355 }
4356
4357 /* Finish up the dynamic sections. */
4358
4359 static bfd_boolean
4360 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4361 struct bfd_link_info *info)
4362 {
4363 struct elf_i386_link_hash_table *htab;
4364 bfd *dynobj;
4365 asection *sdyn;
4366
4367 htab = elf_i386_hash_table (info);
4368 dynobj = htab->elf.dynobj;
4369 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4370
4371 if (htab->elf.dynamic_sections_created)
4372 {
4373 Elf32_External_Dyn *dyncon, *dynconend;
4374
4375 if (sdyn == NULL || htab->elf.sgot == NULL)
4376 abort ();
4377
4378 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4379 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4380 for (; dyncon < dynconend; dyncon++)
4381 {
4382 Elf_Internal_Dyn dyn;
4383 asection *s;
4384
4385 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4386
4387 switch (dyn.d_tag)
4388 {
4389 default:
4390 if (htab->is_vxworks
4391 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4392 break;
4393 continue;
4394
4395 case DT_PLTGOT:
4396 s = htab->elf.sgotplt;
4397 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4398 break;
4399
4400 case DT_JMPREL:
4401 s = htab->elf.srelplt;
4402 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4403 break;
4404
4405 case DT_PLTRELSZ:
4406 s = htab->elf.srelplt;
4407 dyn.d_un.d_val = s->size;
4408 break;
4409
4410 case DT_RELSZ:
4411 /* My reading of the SVR4 ABI indicates that the
4412 procedure linkage table relocs (DT_JMPREL) should be
4413 included in the overall relocs (DT_REL). This is
4414 what Solaris does. However, UnixWare can not handle
4415 that case. Therefore, we override the DT_RELSZ entry
4416 here to make it not include the JMPREL relocs. */
4417 s = htab->elf.srelplt;
4418 if (s == NULL)
4419 continue;
4420 dyn.d_un.d_val -= s->size;
4421 break;
4422
4423 case DT_REL:
4424 /* We may not be using the standard ELF linker script.
4425 If .rel.plt is the first .rel section, we adjust
4426 DT_REL to not include it. */
4427 s = htab->elf.srelplt;
4428 if (s == NULL)
4429 continue;
4430 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4431 continue;
4432 dyn.d_un.d_ptr += s->size;
4433 break;
4434 }
4435
4436 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4437 }
4438
4439 /* Fill in the first entry in the procedure linkage table. */
4440 if (htab->elf.splt && htab->elf.splt->size > 0)
4441 {
4442 if (info->shared)
4443 {
4444 memcpy (htab->elf.splt->contents, elf_i386_pic_plt0_entry,
4445 sizeof (elf_i386_pic_plt0_entry));
4446 memset (htab->elf.splt->contents + sizeof (elf_i386_pic_plt0_entry),
4447 htab->plt0_pad_byte,
4448 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
4449 }
4450 else
4451 {
4452 memcpy (htab->elf.splt->contents, elf_i386_plt0_entry,
4453 sizeof(elf_i386_plt0_entry));
4454 memset (htab->elf.splt->contents + sizeof (elf_i386_plt0_entry),
4455 htab->plt0_pad_byte,
4456 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
4457 bfd_put_32 (output_bfd,
4458 (htab->elf.sgotplt->output_section->vma
4459 + htab->elf.sgotplt->output_offset
4460 + 4),
4461 htab->elf.splt->contents + 2);
4462 bfd_put_32 (output_bfd,
4463 (htab->elf.sgotplt->output_section->vma
4464 + htab->elf.sgotplt->output_offset
4465 + 8),
4466 htab->elf.splt->contents + 8);
4467
4468 if (htab->is_vxworks)
4469 {
4470 Elf_Internal_Rela rel;
4471
4472 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4473 On IA32 we use REL relocations so the addend goes in
4474 the PLT directly. */
4475 rel.r_offset = (htab->elf.splt->output_section->vma
4476 + htab->elf.splt->output_offset
4477 + 2);
4478 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4479 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4480 htab->srelplt2->contents);
4481 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4482 rel.r_offset = (htab->elf.splt->output_section->vma
4483 + htab->elf.splt->output_offset
4484 + 8);
4485 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4486 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4487 htab->srelplt2->contents +
4488 sizeof (Elf32_External_Rel));
4489 }
4490 }
4491
4492 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4493 really seem like the right value. */
4494 elf_section_data (htab->elf.splt->output_section)
4495 ->this_hdr.sh_entsize = 4;
4496
4497 /* Correct the .rel.plt.unloaded relocations. */
4498 if (htab->is_vxworks && !info->shared)
4499 {
4500 int num_plts = (htab->elf.splt->size / PLT_ENTRY_SIZE) - 1;
4501 unsigned char *p;
4502
4503 p = htab->srelplt2->contents;
4504 if (info->shared)
4505 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4506 else
4507 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4508
4509 for (; num_plts; num_plts--)
4510 {
4511 Elf_Internal_Rela rel;
4512 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4513 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4514 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4515 p += sizeof (Elf32_External_Rel);
4516
4517 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4518 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4519 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4520 p += sizeof (Elf32_External_Rel);
4521 }
4522 }
4523 }
4524 }
4525
4526 if (htab->elf.sgotplt)
4527 {
4528 /* Fill in the first three entries in the global offset table. */
4529 if (htab->elf.sgotplt->size > 0)
4530 {
4531 bfd_put_32 (output_bfd,
4532 (sdyn == NULL ? 0
4533 : sdyn->output_section->vma + sdyn->output_offset),
4534 htab->elf.sgotplt->contents);
4535 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4536 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4537 }
4538
4539 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4540 }
4541
4542 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4543 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4544
4545 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4546 htab_traverse (htab->loc_hash_table,
4547 elf_i386_finish_local_dynamic_symbol,
4548 info);
4549
4550 return TRUE;
4551 }
4552
4553 /* Return address for Ith PLT stub in section PLT, for relocation REL
4554 or (bfd_vma) -1 if it should not be included. */
4555
4556 static bfd_vma
4557 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4558 const arelent *rel ATTRIBUTE_UNUSED)
4559 {
4560 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4561 }
4562
4563 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4564
4565 static bfd_boolean
4566 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4567 {
4568 if (h->plt.offset != (bfd_vma) -1
4569 && !h->def_regular
4570 && !h->pointer_equality_needed)
4571 return FALSE;
4572
4573 return _bfd_elf_hash_symbol (h);
4574 }
4575
4576 /* Hook called by the linker routine which adds symbols from an object
4577 file. */
4578
4579 static bfd_boolean
4580 elf_i386_add_symbol_hook (bfd * abfd ATTRIBUTE_UNUSED,
4581 struct bfd_link_info * info ATTRIBUTE_UNUSED,
4582 Elf_Internal_Sym * sym,
4583 const char ** namep ATTRIBUTE_UNUSED,
4584 flagword * flagsp ATTRIBUTE_UNUSED,
4585 asection ** secp ATTRIBUTE_UNUSED,
4586 bfd_vma * valp ATTRIBUTE_UNUSED)
4587 {
4588 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4589 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4590
4591 return TRUE;
4592 }
4593
4594 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4595 #define TARGET_LITTLE_NAME "elf32-i386"
4596 #define ELF_ARCH bfd_arch_i386
4597 #define ELF_MACHINE_CODE EM_386
4598 #define ELF_MAXPAGESIZE 0x1000
4599
4600 #define elf_backend_can_gc_sections 1
4601 #define elf_backend_can_refcount 1
4602 #define elf_backend_want_got_plt 1
4603 #define elf_backend_plt_readonly 1
4604 #define elf_backend_want_plt_sym 0
4605 #define elf_backend_got_header_size 12
4606
4607 /* Support RELA for objdump of prelink objects. */
4608 #define elf_info_to_howto elf_i386_info_to_howto_rel
4609 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4610
4611 #define bfd_elf32_mkobject elf_i386_mkobject
4612
4613 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4614 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4615 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4616 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4617 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4618
4619 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4620 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4621 #define elf_backend_check_relocs elf_i386_check_relocs
4622 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4623 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4624 #define elf_backend_fake_sections elf_i386_fake_sections
4625 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4626 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4627 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4628 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4629 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4630 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4631 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4632 #define elf_backend_relocate_section elf_i386_relocate_section
4633 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4634 #define elf_backend_always_size_sections elf_i386_always_size_sections
4635 #define elf_backend_omit_section_dynsym \
4636 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4637 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4638 #define elf_backend_hash_symbol elf_i386_hash_symbol
4639 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4640 #undef elf_backend_post_process_headers
4641 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4642
4643 #include "elf32-target.h"
4644
4645 /* FreeBSD support. */
4646
4647 #undef TARGET_LITTLE_SYM
4648 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4649 #undef TARGET_LITTLE_NAME
4650 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4651 #undef ELF_OSABI
4652 #define ELF_OSABI ELFOSABI_FREEBSD
4653
4654 /* The kernel recognizes executables as valid only if they carry a
4655 "FreeBSD" label in the ELF header. So we put this label on all
4656 executables and (for simplicity) also all other object files. */
4657
4658 static void
4659 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4660 {
4661 _bfd_elf_set_osabi (abfd, info);
4662
4663 #ifdef OLD_FREEBSD_ABI_LABEL
4664 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4665 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4666 #endif
4667 }
4668
4669 #undef elf_backend_post_process_headers
4670 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4671 #undef elf32_bed
4672 #define elf32_bed elf32_i386_fbsd_bed
4673
4674 #undef elf_backend_add_symbol_hook
4675
4676 #include "elf32-target.h"
4677
4678 /* VxWorks support. */
4679
4680 #undef TARGET_LITTLE_SYM
4681 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4682 #undef TARGET_LITTLE_NAME
4683 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4684 #undef ELF_OSABI
4685
4686 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4687
4688 static struct bfd_link_hash_table *
4689 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4690 {
4691 struct bfd_link_hash_table *ret;
4692 struct elf_i386_link_hash_table *htab;
4693
4694 ret = elf_i386_link_hash_table_create (abfd);
4695 if (ret)
4696 {
4697 htab = (struct elf_i386_link_hash_table *) ret;
4698 htab->is_vxworks = 1;
4699 htab->plt0_pad_byte = 0x90;
4700 }
4701
4702 return ret;
4703 }
4704
4705
4706 #undef elf_backend_relocs_compatible
4707 #undef elf_backend_post_process_headers
4708 #undef bfd_elf32_bfd_link_hash_table_create
4709 #define bfd_elf32_bfd_link_hash_table_create \
4710 elf_i386_vxworks_link_hash_table_create
4711 #undef elf_backend_add_symbol_hook
4712 #define elf_backend_add_symbol_hook \
4713 elf_vxworks_add_symbol_hook
4714 #undef elf_backend_link_output_symbol_hook
4715 #define elf_backend_link_output_symbol_hook \
4716 elf_vxworks_link_output_symbol_hook
4717 #undef elf_backend_emit_relocs
4718 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4719 #undef elf_backend_final_write_processing
4720 #define elf_backend_final_write_processing \
4721 elf_vxworks_final_write_processing
4722
4723 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4724 define it. */
4725 #undef elf_backend_want_plt_sym
4726 #define elf_backend_want_plt_sym 1
4727
4728 #undef elf32_bed
4729 #define elf32_bed elf32_i386_vxworks_bed
4730
4731 #include "elf32-target.h"