2009-06-16 H.J. Lu <hongjiu.lu@intel.com>
[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 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 /* The i386 linker needs to keep track of the number of relocs that it
581 decides to copy as dynamic relocs in check_relocs for each symbol.
582 This is so that it can later discard them if they are found to be
583 unnecessary. We store the information in a field extending the
584 regular ELF linker hash table. */
585
586 struct elf_i386_dyn_relocs
587 {
588 struct elf_i386_dyn_relocs *next;
589
590 /* The input section of the reloc. */
591 asection *sec;
592
593 /* Total number of relocs copied for the input section. */
594 bfd_size_type count;
595
596 /* Number of pc-relative relocs copied for the input section. */
597 bfd_size_type pc_count;
598 };
599
600 /* i386 ELF linker hash entry. */
601
602 struct elf_i386_link_hash_entry
603 {
604 struct elf_link_hash_entry elf;
605
606 /* Track dynamic relocs copied for this symbol. */
607 struct elf_i386_dyn_relocs *dyn_relocs;
608
609 #define GOT_UNKNOWN 0
610 #define GOT_NORMAL 1
611 #define GOT_TLS_GD 2
612 #define GOT_TLS_IE 4
613 #define GOT_TLS_IE_POS 5
614 #define GOT_TLS_IE_NEG 6
615 #define GOT_TLS_IE_BOTH 7
616 #define GOT_TLS_GDESC 8
617 #define GOT_TLS_GD_BOTH_P(type) \
618 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
619 #define GOT_TLS_GD_P(type) \
620 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
621 #define GOT_TLS_GDESC_P(type) \
622 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
623 #define GOT_TLS_GD_ANY_P(type) \
624 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
625 unsigned char tls_type;
626
627 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
628 starting at the end of the jump table. */
629 bfd_vma tlsdesc_got;
630 };
631
632 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
633
634 struct elf_i386_obj_tdata
635 {
636 struct elf_obj_tdata root;
637
638 /* tls_type for each local got entry. */
639 char *local_got_tls_type;
640
641 /* GOTPLT entries for TLS descriptors. */
642 bfd_vma *local_tlsdesc_gotent;
643 };
644
645 #define elf_i386_tdata(abfd) \
646 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
647
648 #define elf_i386_local_got_tls_type(abfd) \
649 (elf_i386_tdata (abfd)->local_got_tls_type)
650
651 #define elf_i386_local_tlsdesc_gotent(abfd) \
652 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
653
654 #define is_i386_elf(bfd) \
655 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
656 && elf_tdata (bfd) != NULL \
657 && elf_object_id (bfd) == I386_ELF_TDATA)
658
659 static bfd_boolean
660 elf_i386_mkobject (bfd *abfd)
661 {
662 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
663 I386_ELF_TDATA);
664 }
665
666 /* i386 ELF linker hash table. */
667
668 struct elf_i386_link_hash_table
669 {
670 struct elf_link_hash_table elf;
671
672 /* Short-cuts to get to dynamic linker sections. */
673 asection *sdynbss;
674 asection *srelbss;
675
676 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
677 asection *srelplt2;
678
679 /* True if the target system is VxWorks. */
680 int is_vxworks;
681
682 /* Value used to fill the last word of the first plt entry. */
683 bfd_byte plt0_pad_byte;
684
685 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
686 bfd_vma next_tls_desc_index;
687
688 union {
689 bfd_signed_vma refcount;
690 bfd_vma offset;
691 } tls_ldm_got;
692
693 /* The amount of space used by the reserved portion of the sgotplt
694 section, plus whatever space is used by the jump slots. */
695 bfd_vma sgotplt_jump_table_size;
696
697 /* Small local sym to section mapping cache. */
698 struct sym_sec_cache sym_sec;
699
700 /* _TLS_MODULE_BASE_ symbol. */
701 struct bfd_link_hash_entry *tls_module_base;
702
703 /* Used by local STT_GNU_IFUNC symbols. */
704 htab_t loc_hash_table;
705 void *loc_hash_memory;
706 };
707
708 /* Get the i386 ELF linker hash table from a link_info structure. */
709
710 #define elf_i386_hash_table(p) \
711 ((struct elf_i386_link_hash_table *) ((p)->hash))
712
713 #define elf_i386_compute_jump_table_size(htab) \
714 ((htab)->next_tls_desc_index * 4)
715
716 /* Create an entry in an i386 ELF linker hash table. */
717
718 static struct bfd_hash_entry *
719 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
720 struct bfd_hash_table *table,
721 const char *string)
722 {
723 /* Allocate the structure if it has not already been allocated by a
724 subclass. */
725 if (entry == NULL)
726 {
727 entry = bfd_hash_allocate (table,
728 sizeof (struct elf_i386_link_hash_entry));
729 if (entry == NULL)
730 return entry;
731 }
732
733 /* Call the allocation method of the superclass. */
734 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
735 if (entry != NULL)
736 {
737 struct elf_i386_link_hash_entry *eh;
738
739 eh = (struct elf_i386_link_hash_entry *) entry;
740 eh->dyn_relocs = NULL;
741 eh->tls_type = GOT_UNKNOWN;
742 eh->tlsdesc_got = (bfd_vma) -1;
743 }
744
745 return entry;
746 }
747
748 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
749 for local symbol so that we can handle local STT_GNU_IFUNC symbols
750 as global symbol. We reuse indx and dynstr_index for local symbol
751 hash since they aren't used by global symbols in this backend. */
752
753 static hashval_t
754 elf_i386_local_htab_hash (const void *ptr)
755 {
756 struct elf_link_hash_entry *h
757 = (struct elf_link_hash_entry *) ptr;
758 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
759 }
760
761 /* Compare local hash entries. */
762
763 static int
764 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
765 {
766 struct elf_link_hash_entry *h1
767 = (struct elf_link_hash_entry *) ptr1;
768 struct elf_link_hash_entry *h2
769 = (struct elf_link_hash_entry *) ptr2;
770
771 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
772 }
773
774 /* Find and/or create a hash entry for local symbol. */
775
776 static struct elf_link_hash_entry *
777 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
778 bfd *abfd, const Elf_Internal_Rela *rel,
779 bfd_boolean create)
780 {
781 struct elf_i386_link_hash_entry e, *ret;
782 asection *sec = abfd->sections;
783 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
784 ELF32_R_SYM (rel->r_info));
785 void **slot;
786
787 e.elf.indx = sec->id;
788 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
789 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
790 create ? INSERT : NO_INSERT);
791
792 if (!slot)
793 return NULL;
794
795 if (*slot)
796 {
797 ret = (struct elf_i386_link_hash_entry *) *slot;
798 return &ret->elf;
799 }
800
801 ret = (struct elf_i386_link_hash_entry *)
802 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
803 sizeof (struct elf_i386_link_hash_entry));
804 if (ret)
805 {
806 memset (ret, 0, sizeof (*ret));
807 ret->elf.indx = sec->id;
808 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
809 ret->elf.dynindx = -1;
810 ret->elf.plt.offset = (bfd_vma) -1;
811 ret->elf.got.offset = (bfd_vma) -1;
812 *slot = ret;
813 }
814 return &ret->elf;
815 }
816
817 /* Create an i386 ELF linker hash table. */
818
819 static struct bfd_link_hash_table *
820 elf_i386_link_hash_table_create (bfd *abfd)
821 {
822 struct elf_i386_link_hash_table *ret;
823 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
824
825 ret = bfd_malloc (amt);
826 if (ret == NULL)
827 return NULL;
828
829 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
830 elf_i386_link_hash_newfunc,
831 sizeof (struct elf_i386_link_hash_entry)))
832 {
833 free (ret);
834 return NULL;
835 }
836
837 ret->sdynbss = NULL;
838 ret->srelbss = NULL;
839 ret->tls_ldm_got.refcount = 0;
840 ret->next_tls_desc_index = 0;
841 ret->sgotplt_jump_table_size = 0;
842 ret->sym_sec.abfd = NULL;
843 ret->is_vxworks = 0;
844 ret->srelplt2 = NULL;
845 ret->plt0_pad_byte = 0;
846 ret->tls_module_base = NULL;
847
848 ret->loc_hash_table = htab_try_create (1024,
849 elf_i386_local_htab_hash,
850 elf_i386_local_htab_eq,
851 NULL);
852 ret->loc_hash_memory = objalloc_create ();
853 if (!ret->loc_hash_table || !ret->loc_hash_memory)
854 {
855 free (ret);
856 return NULL;
857 }
858
859 return &ret->elf.root;
860 }
861
862 /* Destroy an i386 ELF linker hash table. */
863
864 static void
865 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
866 {
867 struct elf_i386_link_hash_table *htab
868 = (struct elf_i386_link_hash_table *) hash;
869
870 if (htab->loc_hash_table)
871 htab_delete (htab->loc_hash_table);
872 if (htab->loc_hash_memory)
873 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
874 _bfd_generic_link_hash_table_free (hash);
875 }
876
877 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
878 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
879 hash table. */
880
881 static bfd_boolean
882 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
883 {
884 struct elf_i386_link_hash_table *htab;
885
886 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
887 return FALSE;
888
889 htab = elf_i386_hash_table (info);
890 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
891 if (!info->shared)
892 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
893
894 if (!htab->sdynbss
895 || (!info->shared && !htab->srelbss))
896 abort ();
897
898 if (htab->is_vxworks
899 && !elf_vxworks_create_dynamic_sections (dynobj, info,
900 &htab->srelplt2))
901 return FALSE;
902
903 return TRUE;
904 }
905
906 /* Copy the extra info we tack onto an elf_link_hash_entry. */
907
908 static void
909 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
910 struct elf_link_hash_entry *dir,
911 struct elf_link_hash_entry *ind)
912 {
913 struct elf_i386_link_hash_entry *edir, *eind;
914
915 edir = (struct elf_i386_link_hash_entry *) dir;
916 eind = (struct elf_i386_link_hash_entry *) ind;
917
918 if (eind->dyn_relocs != NULL)
919 {
920 if (edir->dyn_relocs != NULL)
921 {
922 struct elf_i386_dyn_relocs **pp;
923 struct elf_i386_dyn_relocs *p;
924
925 /* Add reloc counts against the indirect sym to the direct sym
926 list. Merge any entries against the same section. */
927 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
928 {
929 struct elf_i386_dyn_relocs *q;
930
931 for (q = edir->dyn_relocs; q != NULL; q = q->next)
932 if (q->sec == p->sec)
933 {
934 q->pc_count += p->pc_count;
935 q->count += p->count;
936 *pp = p->next;
937 break;
938 }
939 if (q == NULL)
940 pp = &p->next;
941 }
942 *pp = edir->dyn_relocs;
943 }
944
945 edir->dyn_relocs = eind->dyn_relocs;
946 eind->dyn_relocs = NULL;
947 }
948
949 if (ind->root.type == bfd_link_hash_indirect
950 && dir->got.refcount <= 0)
951 {
952 edir->tls_type = eind->tls_type;
953 eind->tls_type = GOT_UNKNOWN;
954 }
955
956 if (ELIMINATE_COPY_RELOCS
957 && ind->root.type != bfd_link_hash_indirect
958 && dir->dynamic_adjusted)
959 {
960 /* If called to transfer flags for a weakdef during processing
961 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
962 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
963 dir->ref_dynamic |= ind->ref_dynamic;
964 dir->ref_regular |= ind->ref_regular;
965 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
966 dir->needs_plt |= ind->needs_plt;
967 dir->pointer_equality_needed |= ind->pointer_equality_needed;
968 }
969 else
970 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
971 }
972
973 typedef union
974 {
975 unsigned char c[2];
976 uint16_t i;
977 }
978 i386_opcode16;
979
980 /* Return TRUE if the TLS access code sequence support transition
981 from R_TYPE. */
982
983 static bfd_boolean
984 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
985 bfd_byte *contents,
986 Elf_Internal_Shdr *symtab_hdr,
987 struct elf_link_hash_entry **sym_hashes,
988 unsigned int r_type,
989 const Elf_Internal_Rela *rel,
990 const Elf_Internal_Rela *relend)
991 {
992 unsigned int val, type;
993 unsigned long r_symndx;
994 struct elf_link_hash_entry *h;
995 bfd_vma offset;
996
997 /* Get the section contents. */
998 if (contents == NULL)
999 {
1000 if (elf_section_data (sec)->this_hdr.contents != NULL)
1001 contents = elf_section_data (sec)->this_hdr.contents;
1002 else
1003 {
1004 /* FIXME: How to better handle error condition? */
1005 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1006 return FALSE;
1007
1008 /* Cache the section contents for elf_link_input_bfd. */
1009 elf_section_data (sec)->this_hdr.contents = contents;
1010 }
1011 }
1012
1013 offset = rel->r_offset;
1014 switch (r_type)
1015 {
1016 case R_386_TLS_GD:
1017 case R_386_TLS_LDM:
1018 if (offset < 2 || (rel + 1) >= relend)
1019 return FALSE;
1020
1021 type = bfd_get_8 (abfd, contents + offset - 2);
1022 if (r_type == R_386_TLS_GD)
1023 {
1024 /* Check transition from GD access model. Only
1025 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1026 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1027 can transit to different access model. */
1028 if ((offset + 10) > sec->size ||
1029 (type != 0x8d && type != 0x04))
1030 return FALSE;
1031
1032 val = bfd_get_8 (abfd, contents + offset - 1);
1033 if (type == 0x04)
1034 {
1035 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1036 if (offset < 3)
1037 return FALSE;
1038
1039 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1040 return FALSE;
1041
1042 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1043 return FALSE;
1044 }
1045 else
1046 {
1047 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1048 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1049 return FALSE;
1050
1051 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1052 return FALSE;
1053 }
1054 }
1055 else
1056 {
1057 /* Check transition from LD access model. Only
1058 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1059 can transit to different access model. */
1060 if (type != 0x8d || (offset + 9) > sec->size)
1061 return FALSE;
1062
1063 val = bfd_get_8 (abfd, contents + offset - 1);
1064 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1065 return FALSE;
1066 }
1067
1068 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1069 return FALSE;
1070
1071 r_symndx = ELF32_R_SYM (rel[1].r_info);
1072 if (r_symndx < symtab_hdr->sh_info)
1073 return FALSE;
1074
1075 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1076 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1077 may be versioned. */
1078 return (h != NULL
1079 && h->root.root.string != NULL
1080 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1081 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1082 && (strncmp (h->root.root.string, "___tls_get_addr",
1083 15) == 0));
1084
1085 case R_386_TLS_IE:
1086 /* Check transition from IE access model:
1087 movl foo@indntpoff(%rip), %eax
1088 movl foo@indntpoff(%rip), %reg
1089 addl foo@indntpoff(%rip), %reg
1090 */
1091
1092 if (offset < 1 || (offset + 4) > sec->size)
1093 return FALSE;
1094
1095 /* Check "movl foo@tpoff(%rip), %eax" first. */
1096 val = bfd_get_8 (abfd, contents + offset - 1);
1097 if (val == 0xa1)
1098 return TRUE;
1099
1100 if (offset < 2)
1101 return FALSE;
1102
1103 /* Check movl|addl foo@tpoff(%rip), %reg. */
1104 type = bfd_get_8 (abfd, contents + offset - 2);
1105 return ((type == 0x8b || type == 0x03)
1106 && (val & 0xc7) == 0x05);
1107
1108 case R_386_TLS_GOTIE:
1109 case R_386_TLS_IE_32:
1110 /* Check transition from {IE_32,GOTIE} access model:
1111 subl foo@{tpoff,gontoff}(%reg1), %reg2
1112 movl foo@{tpoff,gontoff}(%reg1), %reg2
1113 addl foo@{tpoff,gontoff}(%reg1), %reg2
1114 */
1115
1116 if (offset < 2 || (offset + 4) > sec->size)
1117 return FALSE;
1118
1119 val = bfd_get_8 (abfd, contents + offset - 1);
1120 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1121 return FALSE;
1122
1123 type = bfd_get_8 (abfd, contents + offset - 2);
1124 return type == 0x8b || type == 0x2b || type == 0x03;
1125
1126 case R_386_TLS_GOTDESC:
1127 /* Check transition from GDesc access model:
1128 leal x@tlsdesc(%ebx), %eax
1129
1130 Make sure it's a leal adding ebx to a 32-bit offset
1131 into any register, although it's probably almost always
1132 going to be eax. */
1133
1134 if (offset < 2 || (offset + 4) > sec->size)
1135 return FALSE;
1136
1137 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1138 return FALSE;
1139
1140 val = bfd_get_8 (abfd, contents + offset - 1);
1141 return (val & 0xc7) == 0x83;
1142
1143 case R_386_TLS_DESC_CALL:
1144 /* Check transition from GDesc access model:
1145 call *x@tlsdesc(%rax)
1146 */
1147 if (offset + 2 <= sec->size)
1148 {
1149 /* Make sure that it's a call *x@tlsdesc(%rax). */
1150 static i386_opcode16 call = { { 0xff, 0x10 } };
1151 return bfd_get_16 (abfd, contents + offset) == call.i;
1152 }
1153
1154 return FALSE;
1155
1156 default:
1157 abort ();
1158 }
1159 }
1160
1161 /* Return TRUE if the TLS access transition is OK or no transition
1162 will be performed. Update R_TYPE if there is a transition. */
1163
1164 static bfd_boolean
1165 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1166 asection *sec, bfd_byte *contents,
1167 Elf_Internal_Shdr *symtab_hdr,
1168 struct elf_link_hash_entry **sym_hashes,
1169 unsigned int *r_type, int tls_type,
1170 const Elf_Internal_Rela *rel,
1171 const Elf_Internal_Rela *relend,
1172 struct elf_link_hash_entry *h)
1173 {
1174 unsigned int from_type = *r_type;
1175 unsigned int to_type = from_type;
1176 bfd_boolean check = TRUE;
1177
1178 switch (from_type)
1179 {
1180 case R_386_TLS_GD:
1181 case R_386_TLS_GOTDESC:
1182 case R_386_TLS_DESC_CALL:
1183 case R_386_TLS_IE_32:
1184 case R_386_TLS_IE:
1185 case R_386_TLS_GOTIE:
1186 if (!info->shared)
1187 {
1188 if (h == NULL)
1189 to_type = R_386_TLS_LE_32;
1190 else if (from_type != R_386_TLS_IE
1191 && from_type != R_386_TLS_GOTIE)
1192 to_type = R_386_TLS_IE_32;
1193 }
1194
1195 /* When we are called from elf_i386_relocate_section, CONTENTS
1196 isn't NULL and there may be additional transitions based on
1197 TLS_TYPE. */
1198 if (contents != NULL)
1199 {
1200 unsigned int new_to_type = to_type;
1201
1202 if (!info->shared
1203 && h != NULL
1204 && h->dynindx == -1
1205 && (tls_type & GOT_TLS_IE))
1206 new_to_type = R_386_TLS_LE_32;
1207
1208 if (to_type == R_386_TLS_GD
1209 || to_type == R_386_TLS_GOTDESC
1210 || to_type == R_386_TLS_DESC_CALL)
1211 {
1212 if (tls_type == GOT_TLS_IE_POS)
1213 new_to_type = R_386_TLS_GOTIE;
1214 else if (tls_type & GOT_TLS_IE)
1215 new_to_type = R_386_TLS_IE_32;
1216 }
1217
1218 /* We checked the transition before when we were called from
1219 elf_i386_check_relocs. We only want to check the new
1220 transition which hasn't been checked before. */
1221 check = new_to_type != to_type && from_type == to_type;
1222 to_type = new_to_type;
1223 }
1224
1225 break;
1226
1227 case R_386_TLS_LDM:
1228 if (!info->shared)
1229 to_type = R_386_TLS_LE_32;
1230 break;
1231
1232 default:
1233 return TRUE;
1234 }
1235
1236 /* Return TRUE if there is no transition. */
1237 if (from_type == to_type)
1238 return TRUE;
1239
1240 /* Check if the transition can be performed. */
1241 if (check
1242 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1243 symtab_hdr, sym_hashes,
1244 from_type, rel, relend))
1245 {
1246 reloc_howto_type *from, *to;
1247
1248 from = elf_i386_rtype_to_howto (abfd, from_type);
1249 to = elf_i386_rtype_to_howto (abfd, to_type);
1250
1251 (*_bfd_error_handler)
1252 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1253 "in section `%A' failed"),
1254 abfd, sec, from->name, to->name,
1255 h ? h->root.root.string : "a local symbol",
1256 (unsigned long) rel->r_offset);
1257 bfd_set_error (bfd_error_bad_value);
1258 return FALSE;
1259 }
1260
1261 *r_type = to_type;
1262 return TRUE;
1263 }
1264
1265 /* Look through the relocs for a section during the first phase, and
1266 calculate needed space in the global offset table, procedure linkage
1267 table, and dynamic reloc sections. */
1268
1269 static bfd_boolean
1270 elf_i386_check_relocs (bfd *abfd,
1271 struct bfd_link_info *info,
1272 asection *sec,
1273 const Elf_Internal_Rela *relocs)
1274 {
1275 struct elf_i386_link_hash_table *htab;
1276 Elf_Internal_Shdr *symtab_hdr;
1277 struct elf_link_hash_entry **sym_hashes;
1278 const Elf_Internal_Rela *rel;
1279 const Elf_Internal_Rela *rel_end;
1280 asection *sreloc;
1281 Elf_Internal_Sym *isymbuf;
1282
1283 if (info->relocatable)
1284 return TRUE;
1285
1286 BFD_ASSERT (is_i386_elf (abfd));
1287
1288 htab = elf_i386_hash_table (info);
1289 symtab_hdr = &elf_symtab_hdr (abfd);
1290 isymbuf = (Elf_Internal_Sym *) symtab_hdr->contents;
1291 sym_hashes = elf_sym_hashes (abfd);
1292
1293 sreloc = NULL;
1294
1295 rel_end = relocs + sec->reloc_count;
1296 for (rel = relocs; rel < rel_end; rel++)
1297 {
1298 unsigned int r_type;
1299 unsigned long r_symndx;
1300 struct elf_link_hash_entry *h;
1301
1302 r_symndx = ELF32_R_SYM (rel->r_info);
1303 r_type = ELF32_R_TYPE (rel->r_info);
1304
1305 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1306 {
1307 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1308 abfd,
1309 r_symndx);
1310 return FALSE;
1311 }
1312
1313 if (r_symndx < symtab_hdr->sh_info)
1314 {
1315 /* A local symbol. */
1316 Elf_Internal_Sym *isym;
1317
1318 /* Read this BFD's local symbols. */
1319 if (isymbuf == NULL)
1320 {
1321 if (isymbuf == NULL)
1322 isymbuf = bfd_elf_get_elf_syms (abfd, symtab_hdr,
1323 symtab_hdr->sh_info, 0,
1324 NULL, NULL, NULL);
1325 if (isymbuf == NULL)
1326 return FALSE;
1327 }
1328
1329 /* Check relocation against local STT_GNU_IFUNC symbol. */
1330 isym = isymbuf + r_symndx;
1331 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1332 {
1333 h = elf_i386_get_local_sym_hash (htab, abfd, rel,
1334 TRUE);
1335 if (h == NULL)
1336 return FALSE;
1337
1338 /* Fake a STT_GNU_IFUNC symbol. */
1339 h->type = STT_GNU_IFUNC;
1340 h->def_regular = 1;
1341 h->ref_regular = 1;
1342 h->forced_local = 1;
1343 h->root.type = bfd_link_hash_defined;
1344 }
1345 else
1346 h = NULL;
1347 }
1348 else
1349 {
1350 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1351 while (h->root.type == bfd_link_hash_indirect
1352 || h->root.type == bfd_link_hash_warning)
1353 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1354 }
1355
1356 if (h != NULL)
1357 {
1358 /* Create the ifunc sections for static executables. If we
1359 never see an indirect function symbol nor we are building
1360 a static executable, those sections will be empty and
1361 won't appear in output. */
1362 switch (r_type)
1363 {
1364 default:
1365 break;
1366
1367 case R_386_32:
1368 case R_386_PC32:
1369 case R_386_PLT32:
1370 case R_386_GOT32:
1371 case R_386_GOTOFF:
1372 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1373 return FALSE;
1374 break;
1375 }
1376
1377 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1378 it here if it is defined in a non-shared object. */
1379 if (h->type == STT_GNU_IFUNC
1380 && h->def_regular)
1381 {
1382 /* It is referenced by a non-shared object. */
1383 h->ref_regular = 1;
1384
1385 /* STT_GNU_IFUNC symbol must go through PLT. */
1386 h->plt.refcount += 1;
1387
1388 /* STT_GNU_IFUNC needs dynamic sections. */
1389 if (htab->elf.dynobj == NULL)
1390 htab->elf.dynobj = abfd;
1391
1392 switch (r_type)
1393 {
1394 default:
1395 (*_bfd_error_handler)
1396 (_("%B: relocation %s against STT_GNU_IFUNC "
1397 "symbol `%s' isn't handled by %s"), abfd,
1398 elf_howto_table[r_type].name,
1399 (h->root.root.string
1400 ? h->root.root.string : "a local symbol"),
1401 __FUNCTION__);
1402 bfd_set_error (bfd_error_bad_value);
1403 return FALSE;
1404
1405 case R_386_32:
1406 h->non_got_ref = 1;
1407 h->pointer_equality_needed = 1;
1408 if (info->shared)
1409 {
1410 struct elf_i386_dyn_relocs *p;
1411 struct elf_i386_dyn_relocs **head;
1412
1413 /* We must copy these reloc types into the
1414 output file. Create a reloc section in
1415 dynobj and make room for this reloc. */
1416 if (sreloc == NULL)
1417 {
1418 if (htab->elf.dynobj == NULL)
1419 htab->elf.dynobj = abfd;
1420
1421 sreloc = _bfd_elf_make_dynamic_reloc_section
1422 (sec, htab->elf.dynobj, 2, abfd, FALSE);
1423
1424 if (sreloc == NULL)
1425 return FALSE;
1426 }
1427
1428 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1429 p = *head;
1430 if (p == NULL || p->sec != sec)
1431 {
1432 bfd_size_type amt = sizeof *p;
1433 p = bfd_alloc (htab->elf.dynobj, amt);
1434 if (p == NULL)
1435 return FALSE;
1436 p->next = *head;
1437 *head = p;
1438 p->sec = sec;
1439 p->count = 0;
1440 p->pc_count = 0;
1441 }
1442 p->count += 1;
1443 }
1444 break;
1445
1446 case R_386_PC32:
1447 h->non_got_ref = 1;
1448 break;
1449
1450 case R_386_PLT32:
1451 break;
1452
1453 case R_386_GOT32:
1454 case R_386_GOTOFF:
1455 h->got.refcount += 1;
1456 if (htab->elf.sgot == NULL
1457 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1458 info))
1459 return FALSE;
1460 break;
1461 }
1462
1463 continue;
1464 }
1465 }
1466
1467 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1468 symtab_hdr, sym_hashes,
1469 &r_type, GOT_UNKNOWN,
1470 rel, rel_end, h))
1471 return FALSE;
1472
1473 switch (r_type)
1474 {
1475 case R_386_TLS_LDM:
1476 htab->tls_ldm_got.refcount += 1;
1477 goto create_got;
1478
1479 case R_386_PLT32:
1480 /* This symbol requires a procedure linkage table entry. We
1481 actually build the entry in adjust_dynamic_symbol,
1482 because this might be a case of linking PIC code which is
1483 never referenced by a dynamic object, in which case we
1484 don't need to generate a procedure linkage table entry
1485 after all. */
1486
1487 /* If this is a local symbol, we resolve it directly without
1488 creating a procedure linkage table entry. */
1489 if (h == NULL)
1490 continue;
1491
1492 h->needs_plt = 1;
1493 h->plt.refcount += 1;
1494 break;
1495
1496 case R_386_TLS_IE_32:
1497 case R_386_TLS_IE:
1498 case R_386_TLS_GOTIE:
1499 if (info->shared)
1500 info->flags |= DF_STATIC_TLS;
1501 /* Fall through */
1502
1503 case R_386_GOT32:
1504 case R_386_TLS_GD:
1505 case R_386_TLS_GOTDESC:
1506 case R_386_TLS_DESC_CALL:
1507 /* This symbol requires a global offset table entry. */
1508 {
1509 int tls_type, old_tls_type;
1510
1511 switch (r_type)
1512 {
1513 default:
1514 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1515 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1516 case R_386_TLS_GOTDESC:
1517 case R_386_TLS_DESC_CALL:
1518 tls_type = GOT_TLS_GDESC; break;
1519 case R_386_TLS_IE_32:
1520 if (ELF32_R_TYPE (rel->r_info) == r_type)
1521 tls_type = GOT_TLS_IE_NEG;
1522 else
1523 /* If this is a GD->IE transition, we may use either of
1524 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1525 tls_type = GOT_TLS_IE;
1526 break;
1527 case R_386_TLS_IE:
1528 case R_386_TLS_GOTIE:
1529 tls_type = GOT_TLS_IE_POS; break;
1530 }
1531
1532 if (h != NULL)
1533 {
1534 h->got.refcount += 1;
1535 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1536 }
1537 else
1538 {
1539 bfd_signed_vma *local_got_refcounts;
1540
1541 /* This is a global offset table entry for a local symbol. */
1542 local_got_refcounts = elf_local_got_refcounts (abfd);
1543 if (local_got_refcounts == NULL)
1544 {
1545 bfd_size_type size;
1546
1547 size = symtab_hdr->sh_info;
1548 size *= (sizeof (bfd_signed_vma)
1549 + sizeof (bfd_vma) + sizeof(char));
1550 local_got_refcounts = bfd_zalloc (abfd, size);
1551 if (local_got_refcounts == NULL)
1552 return FALSE;
1553 elf_local_got_refcounts (abfd) = local_got_refcounts;
1554 elf_i386_local_tlsdesc_gotent (abfd)
1555 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1556 elf_i386_local_got_tls_type (abfd)
1557 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1558 }
1559 local_got_refcounts[r_symndx] += 1;
1560 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1561 }
1562
1563 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1564 tls_type |= old_tls_type;
1565 /* If a TLS symbol is accessed using IE at least once,
1566 there is no point to use dynamic model for it. */
1567 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1568 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1569 || (tls_type & GOT_TLS_IE) == 0))
1570 {
1571 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1572 tls_type = old_tls_type;
1573 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1574 && GOT_TLS_GD_ANY_P (tls_type))
1575 tls_type |= old_tls_type;
1576 else
1577 {
1578 (*_bfd_error_handler)
1579 (_("%B: `%s' accessed both as normal and "
1580 "thread local symbol"),
1581 abfd,
1582 h ? h->root.root.string : "<local>");
1583 return FALSE;
1584 }
1585 }
1586
1587 if (old_tls_type != tls_type)
1588 {
1589 if (h != NULL)
1590 elf_i386_hash_entry (h)->tls_type = tls_type;
1591 else
1592 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1593 }
1594 }
1595 /* Fall through */
1596
1597 case R_386_GOTOFF:
1598 case R_386_GOTPC:
1599 create_got:
1600 if (htab->elf.sgot == NULL)
1601 {
1602 if (htab->elf.dynobj == NULL)
1603 htab->elf.dynobj = abfd;
1604 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1605 return FALSE;
1606 }
1607 if (r_type != R_386_TLS_IE)
1608 break;
1609 /* Fall through */
1610
1611 case R_386_TLS_LE_32:
1612 case R_386_TLS_LE:
1613 if (!info->shared)
1614 break;
1615 info->flags |= DF_STATIC_TLS;
1616 /* Fall through */
1617
1618 case R_386_32:
1619 case R_386_PC32:
1620 if (h != NULL && info->executable)
1621 {
1622 /* If this reloc is in a read-only section, we might
1623 need a copy reloc. We can't check reliably at this
1624 stage whether the section is read-only, as input
1625 sections have not yet been mapped to output sections.
1626 Tentatively set the flag for now, and correct in
1627 adjust_dynamic_symbol. */
1628 h->non_got_ref = 1;
1629
1630 /* We may need a .plt entry if the function this reloc
1631 refers to is in a shared lib. */
1632 h->plt.refcount += 1;
1633 if (r_type != R_386_PC32)
1634 h->pointer_equality_needed = 1;
1635 }
1636
1637 /* If we are creating a shared library, and this is a reloc
1638 against a global symbol, or a non PC relative reloc
1639 against a local symbol, then we need to copy the reloc
1640 into the shared library. However, if we are linking with
1641 -Bsymbolic, we do not need to copy a reloc against a
1642 global symbol which is defined in an object we are
1643 including in the link (i.e., DEF_REGULAR is set). At
1644 this point we have not seen all the input files, so it is
1645 possible that DEF_REGULAR is not set now but will be set
1646 later (it is never cleared). In case of a weak definition,
1647 DEF_REGULAR may be cleared later by a strong definition in
1648 a shared library. We account for that possibility below by
1649 storing information in the relocs_copied field of the hash
1650 table entry. A similar situation occurs when creating
1651 shared libraries and symbol visibility changes render the
1652 symbol local.
1653
1654 If on the other hand, we are creating an executable, we
1655 may need to keep relocations for symbols satisfied by a
1656 dynamic library if we manage to avoid copy relocs for the
1657 symbol. */
1658 if ((info->shared
1659 && (sec->flags & SEC_ALLOC) != 0
1660 && (r_type != R_386_PC32
1661 || (h != NULL
1662 && (! SYMBOLIC_BIND (info, h)
1663 || h->root.type == bfd_link_hash_defweak
1664 || !h->def_regular))))
1665 || (ELIMINATE_COPY_RELOCS
1666 && !info->shared
1667 && (sec->flags & SEC_ALLOC) != 0
1668 && h != NULL
1669 && (h->root.type == bfd_link_hash_defweak
1670 || !h->def_regular)))
1671 {
1672 struct elf_i386_dyn_relocs *p;
1673 struct elf_i386_dyn_relocs **head;
1674
1675 /* We must copy these reloc types into the output file.
1676 Create a reloc section in dynobj and make room for
1677 this reloc. */
1678 if (sreloc == NULL)
1679 {
1680 if (htab->elf.dynobj == NULL)
1681 htab->elf.dynobj = abfd;
1682
1683 sreloc = _bfd_elf_make_dynamic_reloc_section
1684 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1685
1686 if (sreloc == NULL)
1687 return FALSE;
1688 }
1689
1690 /* If this is a global symbol, we count the number of
1691 relocations we need for this symbol. */
1692 if (h != NULL)
1693 {
1694 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1695 }
1696 else
1697 {
1698 void **vpp;
1699 /* Track dynamic relocs needed for local syms too.
1700 We really need local syms available to do this
1701 easily. Oh well. */
1702
1703 asection *s;
1704 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1705 sec, r_symndx);
1706 if (s == NULL)
1707 return FALSE;
1708
1709 vpp = &elf_section_data (s)->local_dynrel;
1710 head = (struct elf_i386_dyn_relocs **)vpp;
1711 }
1712
1713 p = *head;
1714 if (p == NULL || p->sec != sec)
1715 {
1716 bfd_size_type amt = sizeof *p;
1717 p = bfd_alloc (htab->elf.dynobj, amt);
1718 if (p == NULL)
1719 return FALSE;
1720 p->next = *head;
1721 *head = p;
1722 p->sec = sec;
1723 p->count = 0;
1724 p->pc_count = 0;
1725 }
1726
1727 p->count += 1;
1728 if (r_type == R_386_PC32)
1729 p->pc_count += 1;
1730 }
1731 break;
1732
1733 /* This relocation describes the C++ object vtable hierarchy.
1734 Reconstruct it for later use during GC. */
1735 case R_386_GNU_VTINHERIT:
1736 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1737 return FALSE;
1738 break;
1739
1740 /* This relocation describes which C++ vtable entries are actually
1741 used. Record for later use during GC. */
1742 case R_386_GNU_VTENTRY:
1743 BFD_ASSERT (h != NULL);
1744 if (h != NULL
1745 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1746 return FALSE;
1747 break;
1748
1749 default:
1750 break;
1751 }
1752 }
1753
1754 return TRUE;
1755 }
1756
1757 /* Return the section that should be marked against GC for a given
1758 relocation. */
1759
1760 static asection *
1761 elf_i386_gc_mark_hook (asection *sec,
1762 struct bfd_link_info *info,
1763 Elf_Internal_Rela *rel,
1764 struct elf_link_hash_entry *h,
1765 Elf_Internal_Sym *sym)
1766 {
1767 if (h != NULL)
1768 switch (ELF32_R_TYPE (rel->r_info))
1769 {
1770 case R_386_GNU_VTINHERIT:
1771 case R_386_GNU_VTENTRY:
1772 return NULL;
1773 }
1774
1775 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1776 }
1777
1778 /* Update the got entry reference counts for the section being removed. */
1779
1780 static bfd_boolean
1781 elf_i386_gc_sweep_hook (bfd *abfd,
1782 struct bfd_link_info *info,
1783 asection *sec,
1784 const Elf_Internal_Rela *relocs)
1785 {
1786 Elf_Internal_Shdr *symtab_hdr;
1787 struct elf_link_hash_entry **sym_hashes;
1788 bfd_signed_vma *local_got_refcounts;
1789 const Elf_Internal_Rela *rel, *relend;
1790
1791 if (info->relocatable)
1792 return TRUE;
1793
1794 elf_section_data (sec)->local_dynrel = NULL;
1795
1796 symtab_hdr = &elf_symtab_hdr (abfd);
1797 sym_hashes = elf_sym_hashes (abfd);
1798 local_got_refcounts = elf_local_got_refcounts (abfd);
1799
1800 relend = relocs + sec->reloc_count;
1801 for (rel = relocs; rel < relend; rel++)
1802 {
1803 unsigned long r_symndx;
1804 unsigned int r_type;
1805 struct elf_link_hash_entry *h = NULL;
1806
1807 r_symndx = ELF32_R_SYM (rel->r_info);
1808 if (r_symndx >= symtab_hdr->sh_info)
1809 {
1810 struct elf_i386_link_hash_entry *eh;
1811 struct elf_i386_dyn_relocs **pp;
1812 struct elf_i386_dyn_relocs *p;
1813
1814 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1815 while (h->root.type == bfd_link_hash_indirect
1816 || h->root.type == bfd_link_hash_warning)
1817 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1818 eh = (struct elf_i386_link_hash_entry *) h;
1819
1820 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1821 if (p->sec == sec)
1822 {
1823 /* Everything must go for SEC. */
1824 *pp = p->next;
1825 break;
1826 }
1827 }
1828
1829 r_type = ELF32_R_TYPE (rel->r_info);
1830 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1831 symtab_hdr, sym_hashes,
1832 &r_type, GOT_UNKNOWN,
1833 rel, relend, h))
1834 return FALSE;
1835
1836 switch (r_type)
1837 {
1838 case R_386_TLS_LDM:
1839 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1840 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1841 break;
1842
1843 case R_386_TLS_GD:
1844 case R_386_TLS_GOTDESC:
1845 case R_386_TLS_DESC_CALL:
1846 case R_386_TLS_IE_32:
1847 case R_386_TLS_IE:
1848 case R_386_TLS_GOTIE:
1849 case R_386_GOT32:
1850 if (h != NULL)
1851 {
1852 if (h->got.refcount > 0)
1853 h->got.refcount -= 1;
1854 }
1855 else if (local_got_refcounts != NULL)
1856 {
1857 if (local_got_refcounts[r_symndx] > 0)
1858 local_got_refcounts[r_symndx] -= 1;
1859 }
1860 break;
1861
1862 case R_386_32:
1863 case R_386_PC32:
1864 if (info->shared)
1865 break;
1866 /* Fall through */
1867
1868 case R_386_PLT32:
1869 if (h != NULL)
1870 {
1871 if (h->plt.refcount > 0)
1872 h->plt.refcount -= 1;
1873 }
1874 break;
1875
1876 default:
1877 break;
1878 }
1879 }
1880
1881 return TRUE;
1882 }
1883
1884 /* Adjust a symbol defined by a dynamic object and referenced by a
1885 regular object. The current definition is in some section of the
1886 dynamic object, but we're not including those sections. We have to
1887 change the definition to something the rest of the link can
1888 understand. */
1889
1890 static bfd_boolean
1891 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1892 struct elf_link_hash_entry *h)
1893 {
1894 struct elf_i386_link_hash_table *htab;
1895 asection *s;
1896
1897 /* STT_GNU_IFUNC symbol must go through PLT. */
1898 if (h->type == STT_GNU_IFUNC)
1899 {
1900 if (h->plt.refcount <= 0)
1901 {
1902 h->plt.offset = (bfd_vma) -1;
1903 h->needs_plt = 0;
1904 }
1905 return TRUE;
1906 }
1907
1908 /* If this is a function, put it in the procedure linkage table. We
1909 will fill in the contents of the procedure linkage table later,
1910 when we know the address of the .got section. */
1911 if (h->type == STT_FUNC
1912 || h->needs_plt)
1913 {
1914 if (h->plt.refcount <= 0
1915 || SYMBOL_CALLS_LOCAL (info, h)
1916 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1917 && h->root.type == bfd_link_hash_undefweak))
1918 {
1919 /* This case can occur if we saw a PLT32 reloc in an input
1920 file, but the symbol was never referred to by a dynamic
1921 object, or if all references were garbage collected. In
1922 such a case, we don't actually need to build a procedure
1923 linkage table, and we can just do a PC32 reloc instead. */
1924 h->plt.offset = (bfd_vma) -1;
1925 h->needs_plt = 0;
1926 }
1927
1928 return TRUE;
1929 }
1930 else
1931 /* It's possible that we incorrectly decided a .plt reloc was
1932 needed for an R_386_PC32 reloc to a non-function sym in
1933 check_relocs. We can't decide accurately between function and
1934 non-function syms in check-relocs; Objects loaded later in
1935 the link may change h->type. So fix it now. */
1936 h->plt.offset = (bfd_vma) -1;
1937
1938 /* If this is a weak symbol, and there is a real definition, the
1939 processor independent code will have arranged for us to see the
1940 real definition first, and we can just use the same value. */
1941 if (h->u.weakdef != NULL)
1942 {
1943 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1944 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1945 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1946 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1947 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1948 h->non_got_ref = h->u.weakdef->non_got_ref;
1949 return TRUE;
1950 }
1951
1952 /* This is a reference to a symbol defined by a dynamic object which
1953 is not a function. */
1954
1955 /* If we are creating a shared library, we must presume that the
1956 only references to the symbol are via the global offset table.
1957 For such cases we need not do anything here; the relocations will
1958 be handled correctly by relocate_section. */
1959 if (info->shared)
1960 return TRUE;
1961
1962 /* If there are no references to this symbol that do not use the
1963 GOT, we don't need to generate a copy reloc. */
1964 if (!h->non_got_ref)
1965 return TRUE;
1966
1967 /* If -z nocopyreloc was given, we won't generate them either. */
1968 if (info->nocopyreloc)
1969 {
1970 h->non_got_ref = 0;
1971 return TRUE;
1972 }
1973
1974 htab = elf_i386_hash_table (info);
1975
1976 /* If there aren't any dynamic relocs in read-only sections, then
1977 we can keep the dynamic relocs and avoid the copy reloc. This
1978 doesn't work on VxWorks, where we can not have dynamic relocations
1979 (other than copy and jump slot relocations) in an executable. */
1980 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1981 {
1982 struct elf_i386_link_hash_entry * eh;
1983 struct elf_i386_dyn_relocs *p;
1984
1985 eh = (struct elf_i386_link_hash_entry *) h;
1986 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1987 {
1988 s = p->sec->output_section;
1989 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1990 break;
1991 }
1992
1993 if (p == NULL)
1994 {
1995 h->non_got_ref = 0;
1996 return TRUE;
1997 }
1998 }
1999
2000 if (h->size == 0)
2001 {
2002 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
2003 h->root.root.string);
2004 return TRUE;
2005 }
2006
2007 /* We must allocate the symbol in our .dynbss section, which will
2008 become part of the .bss section of the executable. There will be
2009 an entry for this symbol in the .dynsym section. The dynamic
2010 object will contain position independent code, so all references
2011 from the dynamic object to this symbol will go through the global
2012 offset table. The dynamic linker will use the .dynsym entry to
2013 determine the address it must put in the global offset table, so
2014 both the dynamic object and the regular object will refer to the
2015 same memory location for the variable. */
2016
2017 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2018 copy the initial value out of the dynamic object and into the
2019 runtime process image. */
2020 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2021 {
2022 htab->srelbss->size += sizeof (Elf32_External_Rel);
2023 h->needs_copy = 1;
2024 }
2025
2026 s = htab->sdynbss;
2027
2028 return _bfd_elf_adjust_dynamic_copy (h, s);
2029 }
2030
2031 /* Allocate space in .plt, .got and associated reloc sections for
2032 dynamic relocs. */
2033
2034 static bfd_boolean
2035 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2036 {
2037 struct bfd_link_info *info;
2038 struct elf_i386_link_hash_table *htab;
2039 struct elf_i386_link_hash_entry *eh;
2040 struct elf_i386_dyn_relocs *p;
2041
2042 if (h->root.type == bfd_link_hash_indirect)
2043 return TRUE;
2044
2045 if (h->root.type == bfd_link_hash_warning)
2046 /* When warning symbols are created, they **replace** the "real"
2047 entry in the hash table, thus we never get to see the real
2048 symbol in a hash traversal. So look at it now. */
2049 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2050 eh = (struct elf_i386_link_hash_entry *) h;
2051
2052 info = (struct bfd_link_info *) inf;
2053 htab = elf_i386_hash_table (info);
2054
2055 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2056 here if it is defined and referenced in a non-shared object. */
2057 if (h->type == STT_GNU_IFUNC
2058 && h->def_regular)
2059 {
2060 asection *plt, *gotplt, *relplt;
2061
2062 /* When a shared library references a STT_GNU_IFUNC symbol
2063 defined in executable, the address of the resolved function
2064 may be used. But in non-shared executable, the address of
2065 its .plt slot may be used. Pointer equality may not work
2066 correctly. PIE should be used if pointer equality is
2067 required here. */
2068 if (!info->shared
2069 && (h->dynindx != -1
2070 || info->export_dynamic)
2071 && h->pointer_equality_needed)
2072 {
2073 info->callbacks->einfo
2074 (_("%F%P: dynamic STT_GNU_IFUNC symbol `%s' with pointer "
2075 "equality in `%B' can not be used when making an "
2076 "executable; recompile with -fPIE and relink with -pie\n"),
2077 h->root.root.string,
2078 h->root.u.def.section->owner);
2079 bfd_set_error (bfd_error_bad_value);
2080 return FALSE;
2081 }
2082
2083 /* Return and discard space for dynamic relocations against it if
2084 it is never referenced in a non-shared object. */
2085 if (!h->ref_regular)
2086 {
2087 if (h->plt.refcount > 0
2088 || h->got.refcount > 0)
2089 abort ();
2090 h->got.offset = (bfd_vma) -1;
2091 eh->dyn_relocs = NULL;
2092 return TRUE;
2093 }
2094
2095 /* When building a static executable, use .iplt, .igot.plt and
2096 .rel.iplt sections for STT_GNU_IFUNC symbols. */
2097 if (htab->elf.splt != NULL)
2098 {
2099 plt = htab->elf.splt;
2100 gotplt = htab->elf.sgotplt;
2101 relplt = htab->elf.srelplt;
2102
2103 /* If this is the first .plt entry, make room for the special
2104 first entry. */
2105 if (plt->size == 0)
2106 plt->size += PLT_ENTRY_SIZE;
2107 }
2108 else
2109 {
2110 plt = htab->elf.iplt;
2111 gotplt = htab->elf.igotplt;
2112 relplt = htab->elf.irelplt;
2113 }
2114
2115 /* Don't update value of STT_GNU_IFUNC symbol to PLT. We need
2116 the original value for R_386_IRELATIVE. */
2117 h->plt.offset = plt->size;
2118
2119 /* Make room for this entry in the .plt/.iplt section. */
2120 plt->size += PLT_ENTRY_SIZE;
2121
2122 /* We also need to make an entry in the .got.plt/.got.iplt
2123 section, which will be placed in the .got section by the
2124 linker script. */
2125 gotplt->size += 4;
2126
2127 /* We also need to make an entry in the .rela.plt/.rela.iplt
2128 section. */
2129 relplt->size += sizeof (Elf32_External_Rel);
2130 relplt->reloc_count++;
2131
2132 /* We need dynamic relocation for STT_GNU_IFUNC symbol only
2133 when there is a non-GOT reference in a shared object. */
2134 if (!info->shared
2135 || !h->non_got_ref)
2136 eh->dyn_relocs = NULL;
2137
2138 /* Finally, allocate space. */
2139 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2140 htab->elf.irelifunc->size += p->count * sizeof (Elf32_External_Rel);
2141
2142 /* For STT_GNU_IFUNC symbol, .got.plt has the real function
2143 addres and .got has the PLT entry adddress. We will load
2144 the GOT entry with the PLT entry in finish_dynamic_symbol if
2145 it is used. For branch, it uses .got.plt. For symbol value,
2146 1. Use .got.plt in a shared object if it is forced local or
2147 not dynamic.
2148 2. Use .got.plt in a non-shared object if pointer equality
2149 isn't needed.
2150 3. Use .got.plt in PIE.
2151 4. Use .got.plt if .got isn't used.
2152 5. Otherwise use .got so that it can be shared among different
2153 objects at run-time.
2154 We only need to relocate .got entry in shared object. */
2155 if ((info->shared
2156 && (h->dynindx == -1
2157 || h->forced_local))
2158 || (!info->shared
2159 && !h->pointer_equality_needed)
2160 || (info->executable && info->shared)
2161 || htab->elf.sgot == NULL)
2162 {
2163 /* Use .got.plt. */
2164 h->got.offset = (bfd_vma) -1;
2165 }
2166 else
2167 {
2168 h->got.offset = htab->elf.sgot->size;
2169 htab->elf.sgot->size += 4;
2170 if (info->shared)
2171 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2172 }
2173
2174 return TRUE;
2175 }
2176 else if (htab->elf.dynamic_sections_created
2177 && h->plt.refcount > 0)
2178 {
2179 /* Make sure this symbol is output as a dynamic symbol.
2180 Undefined weak syms won't yet be marked as dynamic. */
2181 if (h->dynindx == -1
2182 && !h->forced_local)
2183 {
2184 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2185 return FALSE;
2186 }
2187
2188 if (info->shared
2189 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2190 {
2191 asection *s = htab->elf.splt;
2192
2193 /* If this is the first .plt entry, make room for the special
2194 first entry. */
2195 if (s->size == 0)
2196 s->size += PLT_ENTRY_SIZE;
2197
2198 h->plt.offset = s->size;
2199
2200 /* If this symbol is not defined in a regular file, and we are
2201 not generating a shared library, then set the symbol to this
2202 location in the .plt. This is required to make function
2203 pointers compare as equal between the normal executable and
2204 the shared library. */
2205 if (! info->shared
2206 && !h->def_regular)
2207 {
2208 h->root.u.def.section = s;
2209 h->root.u.def.value = h->plt.offset;
2210 }
2211
2212 /* Make room for this entry. */
2213 s->size += PLT_ENTRY_SIZE;
2214
2215 /* We also need to make an entry in the .got.plt section, which
2216 will be placed in the .got section by the linker script. */
2217 htab->elf.sgotplt->size += 4;
2218
2219 /* We also need to make an entry in the .rel.plt section. */
2220 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2221 htab->next_tls_desc_index++;
2222
2223 if (htab->is_vxworks && !info->shared)
2224 {
2225 /* VxWorks has a second set of relocations for each PLT entry
2226 in executables. They go in a separate relocation section,
2227 which is processed by the kernel loader. */
2228
2229 /* There are two relocations for the initial PLT entry: an
2230 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2231 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2232
2233 if (h->plt.offset == PLT_ENTRY_SIZE)
2234 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2235
2236 /* There are two extra relocations for each subsequent PLT entry:
2237 an R_386_32 relocation for the GOT entry, and an R_386_32
2238 relocation for the PLT entry. */
2239
2240 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2241 }
2242 }
2243 else
2244 {
2245 h->plt.offset = (bfd_vma) -1;
2246 h->needs_plt = 0;
2247 }
2248 }
2249 else
2250 {
2251 h->plt.offset = (bfd_vma) -1;
2252 h->needs_plt = 0;
2253 }
2254
2255 eh->tlsdesc_got = (bfd_vma) -1;
2256
2257 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2258 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2259 if (h->got.refcount > 0
2260 && !info->shared
2261 && h->dynindx == -1
2262 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2263 h->got.offset = (bfd_vma) -1;
2264 else if (h->got.refcount > 0)
2265 {
2266 asection *s;
2267 bfd_boolean dyn;
2268 int tls_type = elf_i386_hash_entry(h)->tls_type;
2269
2270 /* Make sure this symbol is output as a dynamic symbol.
2271 Undefined weak syms won't yet be marked as dynamic. */
2272 if (h->dynindx == -1
2273 && !h->forced_local)
2274 {
2275 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2276 return FALSE;
2277 }
2278
2279 s = htab->elf.sgot;
2280 if (GOT_TLS_GDESC_P (tls_type))
2281 {
2282 eh->tlsdesc_got = htab->elf.sgotplt->size
2283 - elf_i386_compute_jump_table_size (htab);
2284 htab->elf.sgotplt->size += 8;
2285 h->got.offset = (bfd_vma) -2;
2286 }
2287 if (! GOT_TLS_GDESC_P (tls_type)
2288 || GOT_TLS_GD_P (tls_type))
2289 {
2290 h->got.offset = s->size;
2291 s->size += 4;
2292 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2293 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2294 s->size += 4;
2295 }
2296 dyn = htab->elf.dynamic_sections_created;
2297 /* R_386_TLS_IE_32 needs one dynamic relocation,
2298 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2299 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2300 need two), R_386_TLS_GD needs one if local symbol and two if
2301 global. */
2302 if (tls_type == GOT_TLS_IE_BOTH)
2303 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2304 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2305 || (tls_type & GOT_TLS_IE))
2306 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2307 else if (GOT_TLS_GD_P (tls_type))
2308 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2309 else if (! GOT_TLS_GDESC_P (tls_type)
2310 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2311 || h->root.type != bfd_link_hash_undefweak)
2312 && (info->shared
2313 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2314 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2315 if (GOT_TLS_GDESC_P (tls_type))
2316 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2317 }
2318 else
2319 h->got.offset = (bfd_vma) -1;
2320
2321 if (eh->dyn_relocs == NULL)
2322 return TRUE;
2323
2324 /* In the shared -Bsymbolic case, discard space allocated for
2325 dynamic pc-relative relocs against symbols which turn out to be
2326 defined in regular objects. For the normal shared case, discard
2327 space for pc-relative relocs that have become local due to symbol
2328 visibility changes. */
2329
2330 if (info->shared)
2331 {
2332 /* The only reloc that uses pc_count is R_386_PC32, which will
2333 appear on a call or on something like ".long foo - .". We
2334 want calls to protected symbols to resolve directly to the
2335 function rather than going via the plt. If people want
2336 function pointer comparisons to work as expected then they
2337 should avoid writing assembly like ".long foo - .". */
2338 if (SYMBOL_CALLS_LOCAL (info, h))
2339 {
2340 struct elf_i386_dyn_relocs **pp;
2341
2342 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2343 {
2344 p->count -= p->pc_count;
2345 p->pc_count = 0;
2346 if (p->count == 0)
2347 *pp = p->next;
2348 else
2349 pp = &p->next;
2350 }
2351 }
2352
2353 if (htab->is_vxworks)
2354 {
2355 struct elf_i386_dyn_relocs **pp;
2356 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2357 {
2358 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2359 *pp = p->next;
2360 else
2361 pp = &p->next;
2362 }
2363 }
2364
2365 /* Also discard relocs on undefined weak syms with non-default
2366 visibility. */
2367 if (eh->dyn_relocs != NULL
2368 && h->root.type == bfd_link_hash_undefweak)
2369 {
2370 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2371 eh->dyn_relocs = NULL;
2372
2373 /* Make sure undefined weak symbols are output as a dynamic
2374 symbol in PIEs. */
2375 else if (h->dynindx == -1
2376 && !h->forced_local)
2377 {
2378 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2379 return FALSE;
2380 }
2381 }
2382 }
2383 else if (ELIMINATE_COPY_RELOCS)
2384 {
2385 /* For the non-shared case, discard space for relocs against
2386 symbols which turn out to need copy relocs or are not
2387 dynamic. */
2388
2389 if (!h->non_got_ref
2390 && ((h->def_dynamic
2391 && !h->def_regular)
2392 || (htab->elf.dynamic_sections_created
2393 && (h->root.type == bfd_link_hash_undefweak
2394 || h->root.type == bfd_link_hash_undefined))))
2395 {
2396 /* Make sure this symbol is output as a dynamic symbol.
2397 Undefined weak syms won't yet be marked as dynamic. */
2398 if (h->dynindx == -1
2399 && !h->forced_local)
2400 {
2401 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2402 return FALSE;
2403 }
2404
2405 /* If that succeeded, we know we'll be keeping all the
2406 relocs. */
2407 if (h->dynindx != -1)
2408 goto keep;
2409 }
2410
2411 eh->dyn_relocs = NULL;
2412
2413 keep: ;
2414 }
2415
2416 /* Finally, allocate space. */
2417 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2418 {
2419 asection *sreloc;
2420
2421 sreloc = elf_section_data (p->sec)->sreloc;
2422
2423 BFD_ASSERT (sreloc != NULL);
2424 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2425 }
2426
2427 return TRUE;
2428 }
2429
2430 /* Allocate space in .plt, .got and associated reloc sections for
2431 local dynamic relocs. */
2432
2433 static bfd_boolean
2434 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2435 {
2436 struct elf_link_hash_entry *h
2437 = (struct elf_link_hash_entry *) *slot;
2438
2439 if (h->type != STT_GNU_IFUNC
2440 || !h->def_regular
2441 || !h->ref_regular
2442 || !h->forced_local
2443 || h->root.type != bfd_link_hash_defined)
2444 abort ();
2445
2446 return elf_i386_allocate_dynrelocs (h, inf);
2447 }
2448
2449 /* Find any dynamic relocs that apply to read-only sections. */
2450
2451 static bfd_boolean
2452 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2453 {
2454 struct elf_i386_link_hash_entry *eh;
2455 struct elf_i386_dyn_relocs *p;
2456
2457 if (h->root.type == bfd_link_hash_warning)
2458 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2459
2460 eh = (struct elf_i386_link_hash_entry *) h;
2461 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2462 {
2463 asection *s = p->sec->output_section;
2464
2465 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2466 {
2467 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2468
2469 info->flags |= DF_TEXTREL;
2470
2471 /* Not an error, just cut short the traversal. */
2472 return FALSE;
2473 }
2474 }
2475 return TRUE;
2476 }
2477
2478 /* Set the sizes of the dynamic sections. */
2479
2480 static bfd_boolean
2481 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2482 struct bfd_link_info *info)
2483 {
2484 struct elf_i386_link_hash_table *htab;
2485 bfd *dynobj;
2486 asection *s;
2487 bfd_boolean relocs;
2488 bfd *ibfd;
2489
2490 htab = elf_i386_hash_table (info);
2491 dynobj = htab->elf.dynobj;
2492 if (dynobj == NULL)
2493 abort ();
2494
2495 if (htab->elf.dynamic_sections_created)
2496 {
2497 /* Set the contents of the .interp section to the interpreter. */
2498 if (info->executable)
2499 {
2500 s = bfd_get_section_by_name (dynobj, ".interp");
2501 if (s == NULL)
2502 abort ();
2503 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2504 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2505 }
2506 }
2507
2508 /* Set up .got offsets for local syms, and space for local dynamic
2509 relocs. */
2510 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2511 {
2512 bfd_signed_vma *local_got;
2513 bfd_signed_vma *end_local_got;
2514 char *local_tls_type;
2515 bfd_vma *local_tlsdesc_gotent;
2516 bfd_size_type locsymcount;
2517 Elf_Internal_Shdr *symtab_hdr;
2518 asection *srel;
2519
2520 if (! is_i386_elf (ibfd))
2521 continue;
2522
2523 for (s = ibfd->sections; s != NULL; s = s->next)
2524 {
2525 struct elf_i386_dyn_relocs *p;
2526
2527 for (p = ((struct elf_i386_dyn_relocs *)
2528 elf_section_data (s)->local_dynrel);
2529 p != NULL;
2530 p = p->next)
2531 {
2532 if (!bfd_is_abs_section (p->sec)
2533 && bfd_is_abs_section (p->sec->output_section))
2534 {
2535 /* Input section has been discarded, either because
2536 it is a copy of a linkonce section or due to
2537 linker script /DISCARD/, so we'll be discarding
2538 the relocs too. */
2539 }
2540 else if (htab->is_vxworks
2541 && strcmp (p->sec->output_section->name,
2542 ".tls_vars") == 0)
2543 {
2544 /* Relocations in vxworks .tls_vars sections are
2545 handled specially by the loader. */
2546 }
2547 else if (p->count != 0)
2548 {
2549 srel = elf_section_data (p->sec)->sreloc;
2550 srel->size += p->count * sizeof (Elf32_External_Rel);
2551 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2552 info->flags |= DF_TEXTREL;
2553 }
2554 }
2555 }
2556
2557 local_got = elf_local_got_refcounts (ibfd);
2558 if (!local_got)
2559 continue;
2560
2561 symtab_hdr = &elf_symtab_hdr (ibfd);
2562 locsymcount = symtab_hdr->sh_info;
2563 end_local_got = local_got + locsymcount;
2564 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2565 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2566 s = htab->elf.sgot;
2567 srel = htab->elf.srelgot;
2568 for (; local_got < end_local_got;
2569 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2570 {
2571 *local_tlsdesc_gotent = (bfd_vma) -1;
2572 if (*local_got > 0)
2573 {
2574 if (GOT_TLS_GDESC_P (*local_tls_type))
2575 {
2576 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2577 - elf_i386_compute_jump_table_size (htab);
2578 htab->elf.sgotplt->size += 8;
2579 *local_got = (bfd_vma) -2;
2580 }
2581 if (! GOT_TLS_GDESC_P (*local_tls_type)
2582 || GOT_TLS_GD_P (*local_tls_type))
2583 {
2584 *local_got = s->size;
2585 s->size += 4;
2586 if (GOT_TLS_GD_P (*local_tls_type)
2587 || *local_tls_type == GOT_TLS_IE_BOTH)
2588 s->size += 4;
2589 }
2590 if (info->shared
2591 || GOT_TLS_GD_ANY_P (*local_tls_type)
2592 || (*local_tls_type & GOT_TLS_IE))
2593 {
2594 if (*local_tls_type == GOT_TLS_IE_BOTH)
2595 srel->size += 2 * sizeof (Elf32_External_Rel);
2596 else if (GOT_TLS_GD_P (*local_tls_type)
2597 || ! GOT_TLS_GDESC_P (*local_tls_type))
2598 srel->size += sizeof (Elf32_External_Rel);
2599 if (GOT_TLS_GDESC_P (*local_tls_type))
2600 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2601 }
2602 }
2603 else
2604 *local_got = (bfd_vma) -1;
2605 }
2606 }
2607
2608 if (htab->tls_ldm_got.refcount > 0)
2609 {
2610 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2611 relocs. */
2612 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2613 htab->elf.sgot->size += 8;
2614 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2615 }
2616 else
2617 htab->tls_ldm_got.offset = -1;
2618
2619 /* Allocate global sym .plt and .got entries, and space for global
2620 sym dynamic relocs. */
2621 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2622
2623 /* Allocate .plt and .got entries, and space for local symbols. */
2624 htab_traverse (htab->loc_hash_table,
2625 elf_i386_allocate_local_dynrelocs,
2626 info);
2627
2628 /* For every jump slot reserved in the sgotplt, reloc_count is
2629 incremented. However, when we reserve space for TLS descriptors,
2630 it's not incremented, so in order to compute the space reserved
2631 for them, it suffices to multiply the reloc count by the jump
2632 slot size. */
2633 if (htab->elf.srelplt)
2634 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2635
2636 /* We now have determined the sizes of the various dynamic sections.
2637 Allocate memory for them. */
2638 relocs = FALSE;
2639 for (s = dynobj->sections; s != NULL; s = s->next)
2640 {
2641 bfd_boolean strip_section = TRUE;
2642
2643 if ((s->flags & SEC_LINKER_CREATED) == 0)
2644 continue;
2645
2646 if (s == htab->elf.splt
2647 || s == htab->elf.sgot
2648 || s == htab->elf.sgotplt
2649 || s == htab->elf.iplt
2650 || s == htab->elf.igotplt
2651 || s == htab->sdynbss)
2652 {
2653 /* Strip this section if we don't need it; see the
2654 comment below. */
2655 /* We'd like to strip these sections if they aren't needed, but if
2656 we've exported dynamic symbols from them we must leave them.
2657 It's too late to tell BFD to get rid of the symbols. */
2658
2659 if (htab->elf.hplt != NULL)
2660 strip_section = FALSE;
2661 }
2662 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2663 {
2664 if (s->size != 0
2665 && s != htab->elf.srelplt
2666 && s != htab->srelplt2)
2667 relocs = TRUE;
2668
2669 /* We use the reloc_count field as a counter if we need
2670 to copy relocs into the output file. */
2671 s->reloc_count = 0;
2672 }
2673 else
2674 {
2675 /* It's not one of our sections, so don't allocate space. */
2676 continue;
2677 }
2678
2679 if (s->size == 0)
2680 {
2681 /* If we don't need this section, strip it from the
2682 output file. This is mostly to handle .rel.bss and
2683 .rel.plt. We must create both sections in
2684 create_dynamic_sections, because they must be created
2685 before the linker maps input sections to output
2686 sections. The linker does that before
2687 adjust_dynamic_symbol is called, and it is that
2688 function which decides whether anything needs to go
2689 into these sections. */
2690 if (strip_section)
2691 s->flags |= SEC_EXCLUDE;
2692 continue;
2693 }
2694
2695 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2696 continue;
2697
2698 /* Allocate memory for the section contents. We use bfd_zalloc
2699 here in case unused entries are not reclaimed before the
2700 section's contents are written out. This should not happen,
2701 but this way if it does, we get a R_386_NONE reloc instead
2702 of garbage. */
2703 s->contents = bfd_zalloc (dynobj, s->size);
2704 if (s->contents == NULL)
2705 return FALSE;
2706 }
2707
2708 if (htab->elf.dynamic_sections_created)
2709 {
2710 /* Add some entries to the .dynamic section. We fill in the
2711 values later, in elf_i386_finish_dynamic_sections, but we
2712 must add the entries now so that we get the correct size for
2713 the .dynamic section. The DT_DEBUG entry is filled in by the
2714 dynamic linker and used by the debugger. */
2715 #define add_dynamic_entry(TAG, VAL) \
2716 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2717
2718 if (info->executable)
2719 {
2720 if (!add_dynamic_entry (DT_DEBUG, 0))
2721 return FALSE;
2722 }
2723
2724 if (htab->elf.splt->size != 0)
2725 {
2726 if (!add_dynamic_entry (DT_PLTGOT, 0)
2727 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2728 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2729 || !add_dynamic_entry (DT_JMPREL, 0))
2730 return FALSE;
2731 }
2732
2733 if (relocs)
2734 {
2735 if (!add_dynamic_entry (DT_REL, 0)
2736 || !add_dynamic_entry (DT_RELSZ, 0)
2737 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2738 return FALSE;
2739
2740 /* If any dynamic relocs apply to a read-only section,
2741 then we need a DT_TEXTREL entry. */
2742 if ((info->flags & DF_TEXTREL) == 0)
2743 elf_link_hash_traverse (&htab->elf,
2744 elf_i386_readonly_dynrelocs, info);
2745
2746 if ((info->flags & DF_TEXTREL) != 0)
2747 {
2748 if (!add_dynamic_entry (DT_TEXTREL, 0))
2749 return FALSE;
2750 }
2751 }
2752 if (htab->is_vxworks
2753 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2754 return FALSE;
2755 }
2756 #undef add_dynamic_entry
2757
2758 return TRUE;
2759 }
2760
2761 static bfd_boolean
2762 elf_i386_always_size_sections (bfd *output_bfd,
2763 struct bfd_link_info *info)
2764 {
2765 asection *tls_sec = elf_hash_table (info)->tls_sec;
2766
2767 if (tls_sec)
2768 {
2769 struct elf_link_hash_entry *tlsbase;
2770
2771 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2772 "_TLS_MODULE_BASE_",
2773 FALSE, FALSE, FALSE);
2774
2775 if (tlsbase && tlsbase->type == STT_TLS)
2776 {
2777 struct bfd_link_hash_entry *bh = NULL;
2778 const struct elf_backend_data *bed
2779 = get_elf_backend_data (output_bfd);
2780
2781 if (!(_bfd_generic_link_add_one_symbol
2782 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2783 tls_sec, 0, NULL, FALSE,
2784 bed->collect, &bh)))
2785 return FALSE;
2786
2787 elf_i386_hash_table (info)->tls_module_base = bh;
2788
2789 tlsbase = (struct elf_link_hash_entry *)bh;
2790 tlsbase->def_regular = 1;
2791 tlsbase->other = STV_HIDDEN;
2792 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2793 }
2794 }
2795
2796 return TRUE;
2797 }
2798
2799 /* Set the correct type for an x86 ELF section. We do this by the
2800 section name, which is a hack, but ought to work. */
2801
2802 static bfd_boolean
2803 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2804 Elf_Internal_Shdr *hdr,
2805 asection *sec)
2806 {
2807 register const char *name;
2808
2809 name = bfd_get_section_name (abfd, sec);
2810
2811 /* This is an ugly, but unfortunately necessary hack that is
2812 needed when producing EFI binaries on x86. It tells
2813 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2814 containing ELF relocation info. We need this hack in order to
2815 be able to generate ELF binaries that can be translated into
2816 EFI applications (which are essentially COFF objects). Those
2817 files contain a COFF ".reloc" section inside an ELFNN object,
2818 which would normally cause BFD to segfault because it would
2819 attempt to interpret this section as containing relocation
2820 entries for section "oc". With this hack enabled, ".reloc"
2821 will be treated as a normal data section, which will avoid the
2822 segfault. However, you won't be able to create an ELFNN binary
2823 with a section named "oc" that needs relocations, but that's
2824 the kind of ugly side-effects you get when detecting section
2825 types based on their names... In practice, this limitation is
2826 unlikely to bite. */
2827 if (strcmp (name, ".reloc") == 0)
2828 hdr->sh_type = SHT_PROGBITS;
2829
2830 return TRUE;
2831 }
2832
2833 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2834 executables. Rather than setting it to the beginning of the TLS
2835 section, we have to set it to the end. This function may be called
2836 multiple times, it is idempotent. */
2837
2838 static void
2839 elf_i386_set_tls_module_base (struct bfd_link_info *info)
2840 {
2841 struct bfd_link_hash_entry *base;
2842
2843 if (!info->executable)
2844 return;
2845
2846 base = elf_i386_hash_table (info)->tls_module_base;
2847
2848 if (!base)
2849 return;
2850
2851 base->u.def.value = elf_hash_table (info)->tls_size;
2852 }
2853
2854 /* Return the base VMA address which should be subtracted from real addresses
2855 when resolving @dtpoff relocation.
2856 This is PT_TLS segment p_vaddr. */
2857
2858 static bfd_vma
2859 elf_i386_dtpoff_base (struct bfd_link_info *info)
2860 {
2861 /* If tls_sec is NULL, we should have signalled an error already. */
2862 if (elf_hash_table (info)->tls_sec == NULL)
2863 return 0;
2864 return elf_hash_table (info)->tls_sec->vma;
2865 }
2866
2867 /* Return the relocation value for @tpoff relocation
2868 if STT_TLS virtual address is ADDRESS. */
2869
2870 static bfd_vma
2871 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2872 {
2873 struct elf_link_hash_table *htab = elf_hash_table (info);
2874
2875 /* If tls_sec is NULL, we should have signalled an error already. */
2876 if (htab->tls_sec == NULL)
2877 return 0;
2878 return htab->tls_size + htab->tls_sec->vma - address;
2879 }
2880
2881 /* Relocate an i386 ELF section. */
2882
2883 static bfd_boolean
2884 elf_i386_relocate_section (bfd *output_bfd,
2885 struct bfd_link_info *info,
2886 bfd *input_bfd,
2887 asection *input_section,
2888 bfd_byte *contents,
2889 Elf_Internal_Rela *relocs,
2890 Elf_Internal_Sym *local_syms,
2891 asection **local_sections)
2892 {
2893 struct elf_i386_link_hash_table *htab;
2894 Elf_Internal_Shdr *symtab_hdr;
2895 struct elf_link_hash_entry **sym_hashes;
2896 bfd_vma *local_got_offsets;
2897 bfd_vma *local_tlsdesc_gotents;
2898 Elf_Internal_Rela *rel;
2899 Elf_Internal_Rela *relend;
2900 bfd_boolean is_vxworks_tls;
2901
2902 BFD_ASSERT (is_i386_elf (input_bfd));
2903
2904 htab = elf_i386_hash_table (info);
2905 symtab_hdr = &elf_symtab_hdr (input_bfd);
2906 sym_hashes = elf_sym_hashes (input_bfd);
2907 local_got_offsets = elf_local_got_offsets (input_bfd);
2908 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2909 /* We have to handle relocations in vxworks .tls_vars sections
2910 specially, because the dynamic loader is 'weird'. */
2911 is_vxworks_tls = (htab->is_vxworks && info->shared
2912 && !strcmp (input_section->output_section->name,
2913 ".tls_vars"));
2914
2915 elf_i386_set_tls_module_base (info);
2916
2917 rel = relocs;
2918 relend = relocs + input_section->reloc_count;
2919 for (; rel < relend; rel++)
2920 {
2921 unsigned int r_type;
2922 reloc_howto_type *howto;
2923 unsigned long r_symndx;
2924 struct elf_link_hash_entry *h;
2925 Elf_Internal_Sym *sym;
2926 asection *sec;
2927 bfd_vma off, offplt;
2928 bfd_vma relocation;
2929 bfd_boolean unresolved_reloc;
2930 bfd_reloc_status_type r;
2931 unsigned int indx;
2932 int tls_type;
2933
2934 r_type = ELF32_R_TYPE (rel->r_info);
2935 if (r_type == R_386_GNU_VTINHERIT
2936 || r_type == R_386_GNU_VTENTRY)
2937 continue;
2938
2939 if ((indx = r_type) >= R_386_standard
2940 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2941 >= R_386_ext - R_386_standard)
2942 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2943 >= R_386_irelative - R_386_ext))
2944 {
2945 (*_bfd_error_handler)
2946 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2947 input_bfd, input_section, r_type);
2948 bfd_set_error (bfd_error_bad_value);
2949 return FALSE;
2950 }
2951 howto = elf_howto_table + indx;
2952
2953 r_symndx = ELF32_R_SYM (rel->r_info);
2954 h = NULL;
2955 sym = NULL;
2956 sec = NULL;
2957 unresolved_reloc = FALSE;
2958 if (r_symndx < symtab_hdr->sh_info)
2959 {
2960 sym = local_syms + r_symndx;
2961 sec = local_sections[r_symndx];
2962 relocation = (sec->output_section->vma
2963 + sec->output_offset
2964 + sym->st_value);
2965
2966 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2967 && ((sec->flags & SEC_MERGE) != 0
2968 || (info->relocatable
2969 && sec->output_offset != 0)))
2970 {
2971 bfd_vma addend;
2972 bfd_byte *where = contents + rel->r_offset;
2973
2974 switch (howto->size)
2975 {
2976 case 0:
2977 addend = bfd_get_8 (input_bfd, where);
2978 if (howto->pc_relative)
2979 {
2980 addend = (addend ^ 0x80) - 0x80;
2981 addend += 1;
2982 }
2983 break;
2984 case 1:
2985 addend = bfd_get_16 (input_bfd, where);
2986 if (howto->pc_relative)
2987 {
2988 addend = (addend ^ 0x8000) - 0x8000;
2989 addend += 2;
2990 }
2991 break;
2992 case 2:
2993 addend = bfd_get_32 (input_bfd, where);
2994 if (howto->pc_relative)
2995 {
2996 addend = (addend ^ 0x80000000) - 0x80000000;
2997 addend += 4;
2998 }
2999 break;
3000 default:
3001 abort ();
3002 }
3003
3004 if (info->relocatable)
3005 addend += sec->output_offset;
3006 else
3007 {
3008 asection *msec = sec;
3009 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3010 addend);
3011 addend -= relocation;
3012 addend += msec->output_section->vma + msec->output_offset;
3013 }
3014
3015 switch (howto->size)
3016 {
3017 case 0:
3018 /* FIXME: overflow checks. */
3019 if (howto->pc_relative)
3020 addend -= 1;
3021 bfd_put_8 (input_bfd, addend, where);
3022 break;
3023 case 1:
3024 if (howto->pc_relative)
3025 addend -= 2;
3026 bfd_put_16 (input_bfd, addend, where);
3027 break;
3028 case 2:
3029 if (howto->pc_relative)
3030 addend -= 4;
3031 bfd_put_32 (input_bfd, addend, where);
3032 break;
3033 }
3034 }
3035 else if (ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3036 {
3037 /* Relocate against local STT_GNU_IFUNC symbol. */
3038 h = elf_i386_get_local_sym_hash (htab, input_bfd,
3039 rel, FALSE);
3040 if (h == NULL)
3041 abort ();
3042
3043 /* Set STT_GNU_IFUNC symbol value. */
3044 h->root.u.def.value = sym->st_value;
3045 h->root.u.def.section = sec;
3046 }
3047 }
3048 else
3049 {
3050 bfd_boolean warned;
3051
3052 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3053 r_symndx, symtab_hdr, sym_hashes,
3054 h, sec, relocation,
3055 unresolved_reloc, warned);
3056 }
3057
3058 if (sec != NULL && elf_discarded_section (sec))
3059 {
3060 /* For relocs against symbols from removed linkonce sections,
3061 or sections discarded by a linker script, we just want the
3062 section contents zeroed. Avoid any special processing. */
3063 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
3064 rel->r_info = 0;
3065 rel->r_addend = 0;
3066 continue;
3067 }
3068
3069 if (info->relocatable)
3070 continue;
3071
3072 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3073 it here if it is defined in a non-shared object. */
3074 if (h != NULL
3075 && h->type == STT_GNU_IFUNC
3076 && h->def_regular)
3077 {
3078 asection *plt, *gotplt, *base_got;
3079 bfd_vma plt_index;
3080
3081 if ((input_section->flags & SEC_ALLOC) == 0
3082 || h->plt.offset == (bfd_vma) -1)
3083 abort ();
3084
3085 /* STT_GNU_IFUNC symbol must go through PLT. */
3086 if (htab->elf.splt != NULL)
3087 {
3088 plt = htab->elf.splt;
3089 gotplt = htab->elf.sgotplt;
3090 }
3091 else
3092 {
3093 plt = htab->elf.iplt;
3094 gotplt = htab->elf.igotplt;
3095 }
3096
3097 relocation = (plt->output_section->vma
3098 + plt->output_offset + h->plt.offset);
3099
3100 switch (r_type)
3101 {
3102 default:
3103 (*_bfd_error_handler)
3104 (_("%B: relocation %s against STT_GNU_IFUNC "
3105 "symbol `%s' isn't handled by %s"), input_bfd,
3106 elf_howto_table[r_type].name,
3107 (h->root.root.string
3108 ? h->root.root.string : "a local symbol"),
3109 __FUNCTION__);
3110 bfd_set_error (bfd_error_bad_value);
3111 return FALSE;
3112
3113 case R_386_32:
3114 /* Generate dynamic relcoation only when there is a
3115 non-GOF reference in a shared object. */
3116 if (info->shared && h->non_got_ref)
3117 {
3118 Elf_Internal_Rela outrel;
3119 bfd_byte *loc;
3120 asection *sreloc;
3121 bfd_vma offset;
3122
3123 /* Need a dynamic relocation to get the real function
3124 adddress. */
3125 offset = _bfd_elf_section_offset (output_bfd,
3126 info,
3127 input_section,
3128 rel->r_offset);
3129 if (offset == (bfd_vma) -1
3130 || offset == (bfd_vma) -2)
3131 abort ();
3132
3133 outrel.r_offset = (input_section->output_section->vma
3134 + input_section->output_offset
3135 + offset);
3136
3137 if (h->dynindx == -1
3138 || h->forced_local
3139 || info->executable)
3140 {
3141 /* This symbol is resolved locally. */
3142 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3143 bfd_put_32 (output_bfd,
3144 (h->root.u.def.value
3145 + h->root.u.def.section->output_section->vma
3146 + h->root.u.def.section->output_offset),
3147 contents + offset);
3148 }
3149 else
3150 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3151
3152 sreloc = htab->elf.irelifunc;
3153 loc = sreloc->contents;
3154 loc += (sreloc->reloc_count++
3155 * sizeof (Elf32_External_Rel));
3156 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3157
3158 /* If this reloc is against an external symbol, we
3159 do not want to fiddle with the addend. Otherwise,
3160 we need to include the symbol value so that it
3161 becomes an addend for the dynamic reloc. For an
3162 internal symbol, we have updated addend. */
3163 continue;
3164 }
3165
3166 case R_386_PC32:
3167 case R_386_PLT32:
3168 goto do_relocation;
3169
3170 case R_386_GOT32:
3171 base_got = htab->elf.sgot;
3172 off = h->got.offset;
3173
3174 if (base_got == NULL)
3175 abort ();
3176
3177 if (off == (bfd_vma) -1)
3178 {
3179 /* We can't use h->got.offset here to save state, or
3180 even just remember the offset, as finish_dynamic_symbol
3181 would use that as offset into .got. */
3182
3183 if (htab->elf.splt != NULL)
3184 {
3185 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3186 off = (plt_index + 3) * 4;
3187 base_got = htab->elf.sgotplt;
3188 }
3189 else
3190 {
3191 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3192 off = plt_index * 4;
3193 base_got = htab->elf.igotplt;
3194 }
3195
3196 if (h->dynindx == -1
3197 || h->forced_local
3198 || info->symbolic)
3199 {
3200 /* This references the local defitionion. We must
3201 initialize this entry in the global offset table.
3202 Since the offset must always be a multiple of 8,
3203 we use the least significant bit to record
3204 whether we have initialized it already.
3205
3206 When doing a dynamic link, we create a .rela.got
3207 relocation entry to initialize the value. This
3208 is done in the finish_dynamic_symbol routine. */
3209 if ((off & 1) != 0)
3210 off &= ~1;
3211 else
3212 {
3213 bfd_put_32 (output_bfd, relocation,
3214 base_got->contents + off);
3215 h->got.offset |= 1;
3216 }
3217 }
3218
3219 relocation = off;
3220
3221 /* Adjust for static executables. */
3222 if (htab->elf.splt == NULL)
3223 relocation += gotplt->output_offset;
3224 }
3225 else
3226 {
3227 relocation = (base_got->output_section->vma
3228 + base_got->output_offset + off
3229 - gotplt->output_section->vma
3230 - gotplt->output_offset);
3231 /* Adjust for static executables. */
3232 if (htab->elf.splt == NULL)
3233 relocation += gotplt->output_offset;
3234 }
3235
3236 goto do_relocation;
3237
3238 case R_386_GOTOFF:
3239 relocation -= (gotplt->output_section->vma
3240 + gotplt->output_offset);
3241 goto do_relocation;
3242 }
3243 }
3244
3245 switch (r_type)
3246 {
3247 case R_386_GOT32:
3248 /* Relocation is to the entry for this symbol in the global
3249 offset table. */
3250 if (htab->elf.sgot == NULL)
3251 abort ();
3252
3253 if (h != NULL)
3254 {
3255 bfd_boolean dyn;
3256
3257 off = h->got.offset;
3258 dyn = htab->elf.dynamic_sections_created;
3259 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3260 || (info->shared
3261 && SYMBOL_REFERENCES_LOCAL (info, h))
3262 || (ELF_ST_VISIBILITY (h->other)
3263 && h->root.type == bfd_link_hash_undefweak))
3264 {
3265 /* This is actually a static link, or it is a
3266 -Bsymbolic link and the symbol is defined
3267 locally, or the symbol was forced to be local
3268 because of a version file. We must initialize
3269 this entry in the global offset table. Since the
3270 offset must always be a multiple of 4, we use the
3271 least significant bit to record whether we have
3272 initialized it already.
3273
3274 When doing a dynamic link, we create a .rel.got
3275 relocation entry to initialize the value. This
3276 is done in the finish_dynamic_symbol routine. */
3277 if ((off & 1) != 0)
3278 off &= ~1;
3279 else
3280 {
3281 bfd_put_32 (output_bfd, relocation,
3282 htab->elf.sgot->contents + off);
3283 h->got.offset |= 1;
3284 }
3285 }
3286 else
3287 unresolved_reloc = FALSE;
3288 }
3289 else
3290 {
3291 if (local_got_offsets == NULL)
3292 abort ();
3293
3294 off = local_got_offsets[r_symndx];
3295
3296 /* The offset must always be a multiple of 4. We use
3297 the least significant bit to record whether we have
3298 already generated the necessary reloc. */
3299 if ((off & 1) != 0)
3300 off &= ~1;
3301 else
3302 {
3303 bfd_put_32 (output_bfd, relocation,
3304 htab->elf.sgot->contents + off);
3305
3306 if (info->shared)
3307 {
3308 asection *s;
3309 Elf_Internal_Rela outrel;
3310 bfd_byte *loc;
3311
3312 s = htab->elf.srelgot;
3313 if (s == NULL)
3314 abort ();
3315
3316 outrel.r_offset = (htab->elf.sgot->output_section->vma
3317 + htab->elf.sgot->output_offset
3318 + off);
3319 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3320 loc = s->contents;
3321 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3322 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3323 }
3324
3325 local_got_offsets[r_symndx] |= 1;
3326 }
3327 }
3328
3329 if (off >= (bfd_vma) -2)
3330 abort ();
3331
3332 relocation = htab->elf.sgot->output_section->vma
3333 + htab->elf.sgot->output_offset + off
3334 - htab->elf.sgotplt->output_section->vma
3335 - htab->elf.sgotplt->output_offset;
3336 break;
3337
3338 case R_386_GOTOFF:
3339 /* Relocation is relative to the start of the global offset
3340 table. */
3341
3342 /* Check to make sure it isn't a protected function symbol
3343 for shared library since it may not be local when used
3344 as function address. We also need to make sure that a
3345 symbol is defined locally. */
3346 if (info->shared && h)
3347 {
3348 if (!h->def_regular)
3349 {
3350 const char *v;
3351
3352 switch (ELF_ST_VISIBILITY (h->other))
3353 {
3354 case STV_HIDDEN:
3355 v = _("hidden symbol");
3356 break;
3357 case STV_INTERNAL:
3358 v = _("internal symbol");
3359 break;
3360 case STV_PROTECTED:
3361 v = _("protected symbol");
3362 break;
3363 default:
3364 v = _("symbol");
3365 break;
3366 }
3367
3368 (*_bfd_error_handler)
3369 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3370 input_bfd, v, h->root.root.string);
3371 bfd_set_error (bfd_error_bad_value);
3372 return FALSE;
3373 }
3374 else if (!info->executable
3375 && h->type == STT_FUNC
3376 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3377 {
3378 (*_bfd_error_handler)
3379 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3380 input_bfd, h->root.root.string);
3381 bfd_set_error (bfd_error_bad_value);
3382 return FALSE;
3383 }
3384 }
3385
3386 /* Note that sgot is not involved in this
3387 calculation. We always want the start of .got.plt. If we
3388 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3389 permitted by the ABI, we might have to change this
3390 calculation. */
3391 relocation -= htab->elf.sgotplt->output_section->vma
3392 + htab->elf.sgotplt->output_offset;
3393 break;
3394
3395 case R_386_GOTPC:
3396 /* Use global offset table as symbol value. */
3397 relocation = htab->elf.sgotplt->output_section->vma
3398 + htab->elf.sgotplt->output_offset;
3399 unresolved_reloc = FALSE;
3400 break;
3401
3402 case R_386_PLT32:
3403 /* Relocation is to the entry for this symbol in the
3404 procedure linkage table. */
3405
3406 /* Resolve a PLT32 reloc against a local symbol directly,
3407 without using the procedure linkage table. */
3408 if (h == NULL)
3409 break;
3410
3411 if (h->plt.offset == (bfd_vma) -1
3412 || htab->elf.splt == NULL)
3413 {
3414 /* We didn't make a PLT entry for this symbol. This
3415 happens when statically linking PIC code, or when
3416 using -Bsymbolic. */
3417 break;
3418 }
3419
3420 relocation = (htab->elf.splt->output_section->vma
3421 + htab->elf.splt->output_offset
3422 + h->plt.offset);
3423 unresolved_reloc = FALSE;
3424 break;
3425
3426 case R_386_32:
3427 case R_386_PC32:
3428 if ((input_section->flags & SEC_ALLOC) == 0
3429 || is_vxworks_tls)
3430 break;
3431
3432 if ((info->shared
3433 && (h == NULL
3434 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3435 || h->root.type != bfd_link_hash_undefweak)
3436 && (r_type != R_386_PC32
3437 || !SYMBOL_CALLS_LOCAL (info, h)))
3438 || (ELIMINATE_COPY_RELOCS
3439 && !info->shared
3440 && h != NULL
3441 && h->dynindx != -1
3442 && !h->non_got_ref
3443 && ((h->def_dynamic
3444 && !h->def_regular)
3445 || h->root.type == bfd_link_hash_undefweak
3446 || h->root.type == bfd_link_hash_undefined)))
3447 {
3448 Elf_Internal_Rela outrel;
3449 bfd_byte *loc;
3450 bfd_boolean skip, relocate;
3451 asection *sreloc;
3452
3453 /* When generating a shared object, these relocations
3454 are copied into the output file to be resolved at run
3455 time. */
3456
3457 skip = FALSE;
3458 relocate = FALSE;
3459
3460 outrel.r_offset =
3461 _bfd_elf_section_offset (output_bfd, info, input_section,
3462 rel->r_offset);
3463 if (outrel.r_offset == (bfd_vma) -1)
3464 skip = TRUE;
3465 else if (outrel.r_offset == (bfd_vma) -2)
3466 skip = TRUE, relocate = TRUE;
3467 outrel.r_offset += (input_section->output_section->vma
3468 + input_section->output_offset);
3469
3470 if (skip)
3471 memset (&outrel, 0, sizeof outrel);
3472 else if (h != NULL
3473 && h->dynindx != -1
3474 && (r_type == R_386_PC32
3475 || !info->shared
3476 || !SYMBOLIC_BIND (info, h)
3477 || !h->def_regular))
3478 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3479 else
3480 {
3481 /* This symbol is local, or marked to become local. */
3482 relocate = TRUE;
3483 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3484 }
3485
3486 sreloc = elf_section_data (input_section)->sreloc;
3487
3488 BFD_ASSERT (sreloc != NULL && sreloc->contents != NULL);
3489
3490 loc = sreloc->contents;
3491 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3492
3493 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3494
3495 /* If this reloc is against an external symbol, we do
3496 not want to fiddle with the addend. Otherwise, we
3497 need to include the symbol value so that it becomes
3498 an addend for the dynamic reloc. */
3499 if (! relocate)
3500 continue;
3501 }
3502 break;
3503
3504 case R_386_TLS_IE:
3505 if (info->shared)
3506 {
3507 Elf_Internal_Rela outrel;
3508 bfd_byte *loc;
3509 asection *sreloc;
3510
3511 outrel.r_offset = rel->r_offset
3512 + input_section->output_section->vma
3513 + input_section->output_offset;
3514 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3515 sreloc = elf_section_data (input_section)->sreloc;
3516 if (sreloc == NULL)
3517 abort ();
3518 loc = sreloc->contents;
3519 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3520 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3521 }
3522 /* Fall through */
3523
3524 case R_386_TLS_GD:
3525 case R_386_TLS_GOTDESC:
3526 case R_386_TLS_DESC_CALL:
3527 case R_386_TLS_IE_32:
3528 case R_386_TLS_GOTIE:
3529 tls_type = GOT_UNKNOWN;
3530 if (h == NULL && local_got_offsets)
3531 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3532 else if (h != NULL)
3533 tls_type = elf_i386_hash_entry(h)->tls_type;
3534 if (tls_type == GOT_TLS_IE)
3535 tls_type = GOT_TLS_IE_NEG;
3536
3537 if (! elf_i386_tls_transition (info, input_bfd,
3538 input_section, contents,
3539 symtab_hdr, sym_hashes,
3540 &r_type, tls_type, rel,
3541 relend, h))
3542 return FALSE;
3543
3544 if (r_type == R_386_TLS_LE_32)
3545 {
3546 BFD_ASSERT (! unresolved_reloc);
3547 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3548 {
3549 unsigned int type;
3550 bfd_vma roff;
3551
3552 /* GD->LE transition. */
3553 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3554 if (type == 0x04)
3555 {
3556 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3557 Change it into:
3558 movl %gs:0, %eax; subl $foo@tpoff, %eax
3559 (6 byte form of subl). */
3560 memcpy (contents + rel->r_offset - 3,
3561 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3562 roff = rel->r_offset + 5;
3563 }
3564 else
3565 {
3566 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3567 Change it into:
3568 movl %gs:0, %eax; subl $foo@tpoff, %eax
3569 (6 byte form of subl). */
3570 memcpy (contents + rel->r_offset - 2,
3571 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3572 roff = rel->r_offset + 6;
3573 }
3574 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3575 contents + roff);
3576 /* Skip R_386_PC32/R_386_PLT32. */
3577 rel++;
3578 continue;
3579 }
3580 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3581 {
3582 /* GDesc -> LE transition.
3583 It's originally something like:
3584 leal x@tlsdesc(%ebx), %eax
3585
3586 leal x@ntpoff, %eax
3587
3588 Registers other than %eax may be set up here. */
3589
3590 unsigned int val;
3591 bfd_vma roff;
3592
3593 roff = rel->r_offset;
3594 val = bfd_get_8 (input_bfd, contents + roff - 1);
3595
3596 /* Now modify the instruction as appropriate. */
3597 /* aoliva FIXME: remove the above and xor the byte
3598 below with 0x86. */
3599 bfd_put_8 (output_bfd, val ^ 0x86,
3600 contents + roff - 1);
3601 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3602 contents + roff);
3603 continue;
3604 }
3605 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3606 {
3607 /* GDesc -> LE transition.
3608 It's originally:
3609 call *(%eax)
3610 Turn it into:
3611 xchg %ax,%ax */
3612
3613 bfd_vma roff;
3614
3615 roff = rel->r_offset;
3616 bfd_put_8 (output_bfd, 0x66, contents + roff);
3617 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3618 continue;
3619 }
3620 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3621 {
3622 unsigned int val;
3623
3624 /* IE->LE transition:
3625 Originally it can be one of:
3626 movl foo, %eax
3627 movl foo, %reg
3628 addl foo, %reg
3629 We change it into:
3630 movl $foo, %eax
3631 movl $foo, %reg
3632 addl $foo, %reg. */
3633 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3634 if (val == 0xa1)
3635 {
3636 /* movl foo, %eax. */
3637 bfd_put_8 (output_bfd, 0xb8,
3638 contents + rel->r_offset - 1);
3639 }
3640 else
3641 {
3642 unsigned int type;
3643
3644 type = bfd_get_8 (input_bfd,
3645 contents + rel->r_offset - 2);
3646 switch (type)
3647 {
3648 case 0x8b:
3649 /* movl */
3650 bfd_put_8 (output_bfd, 0xc7,
3651 contents + rel->r_offset - 2);
3652 bfd_put_8 (output_bfd,
3653 0xc0 | ((val >> 3) & 7),
3654 contents + rel->r_offset - 1);
3655 break;
3656 case 0x03:
3657 /* addl */
3658 bfd_put_8 (output_bfd, 0x81,
3659 contents + rel->r_offset - 2);
3660 bfd_put_8 (output_bfd,
3661 0xc0 | ((val >> 3) & 7),
3662 contents + rel->r_offset - 1);
3663 break;
3664 default:
3665 BFD_FAIL ();
3666 break;
3667 }
3668 }
3669 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3670 contents + rel->r_offset);
3671 continue;
3672 }
3673 else
3674 {
3675 unsigned int val, type;
3676
3677 /* {IE_32,GOTIE}->LE transition:
3678 Originally it can be one of:
3679 subl foo(%reg1), %reg2
3680 movl foo(%reg1), %reg2
3681 addl foo(%reg1), %reg2
3682 We change it into:
3683 subl $foo, %reg2
3684 movl $foo, %reg2 (6 byte form)
3685 addl $foo, %reg2. */
3686 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3687 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3688 if (type == 0x8b)
3689 {
3690 /* movl */
3691 bfd_put_8 (output_bfd, 0xc7,
3692 contents + rel->r_offset - 2);
3693 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3694 contents + rel->r_offset - 1);
3695 }
3696 else if (type == 0x2b)
3697 {
3698 /* subl */
3699 bfd_put_8 (output_bfd, 0x81,
3700 contents + rel->r_offset - 2);
3701 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3702 contents + rel->r_offset - 1);
3703 }
3704 else if (type == 0x03)
3705 {
3706 /* addl */
3707 bfd_put_8 (output_bfd, 0x81,
3708 contents + rel->r_offset - 2);
3709 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3710 contents + rel->r_offset - 1);
3711 }
3712 else
3713 BFD_FAIL ();
3714 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3715 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3716 contents + rel->r_offset);
3717 else
3718 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3719 contents + rel->r_offset);
3720 continue;
3721 }
3722 }
3723
3724 if (htab->elf.sgot == NULL)
3725 abort ();
3726
3727 if (h != NULL)
3728 {
3729 off = h->got.offset;
3730 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3731 }
3732 else
3733 {
3734 if (local_got_offsets == NULL)
3735 abort ();
3736
3737 off = local_got_offsets[r_symndx];
3738 offplt = local_tlsdesc_gotents[r_symndx];
3739 }
3740
3741 if ((off & 1) != 0)
3742 off &= ~1;
3743 else
3744 {
3745 Elf_Internal_Rela outrel;
3746 bfd_byte *loc;
3747 int dr_type, indx;
3748 asection *sreloc;
3749
3750 if (htab->elf.srelgot == NULL)
3751 abort ();
3752
3753 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3754
3755 if (GOT_TLS_GDESC_P (tls_type))
3756 {
3757 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3758 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3759 <= htab->elf.sgotplt->size);
3760 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3761 + htab->elf.sgotplt->output_offset
3762 + offplt
3763 + htab->sgotplt_jump_table_size);
3764 sreloc = htab->elf.srelplt;
3765 loc = sreloc->contents;
3766 loc += (htab->next_tls_desc_index++
3767 * sizeof (Elf32_External_Rel));
3768 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3769 <= sreloc->contents + sreloc->size);
3770 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3771 if (indx == 0)
3772 {
3773 BFD_ASSERT (! unresolved_reloc);
3774 bfd_put_32 (output_bfd,
3775 relocation - elf_i386_dtpoff_base (info),
3776 htab->elf.sgotplt->contents + offplt
3777 + htab->sgotplt_jump_table_size + 4);
3778 }
3779 else
3780 {
3781 bfd_put_32 (output_bfd, 0,
3782 htab->elf.sgotplt->contents + offplt
3783 + htab->sgotplt_jump_table_size + 4);
3784 }
3785 }
3786
3787 sreloc = htab->elf.srelgot;
3788
3789 outrel.r_offset = (htab->elf.sgot->output_section->vma
3790 + htab->elf.sgot->output_offset + off);
3791
3792 if (GOT_TLS_GD_P (tls_type))
3793 dr_type = R_386_TLS_DTPMOD32;
3794 else if (GOT_TLS_GDESC_P (tls_type))
3795 goto dr_done;
3796 else if (tls_type == GOT_TLS_IE_POS)
3797 dr_type = R_386_TLS_TPOFF;
3798 else
3799 dr_type = R_386_TLS_TPOFF32;
3800
3801 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3802 bfd_put_32 (output_bfd,
3803 relocation - elf_i386_dtpoff_base (info),
3804 htab->elf.sgot->contents + off);
3805 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3806 bfd_put_32 (output_bfd,
3807 elf_i386_dtpoff_base (info) - relocation,
3808 htab->elf.sgot->contents + off);
3809 else if (dr_type != R_386_TLS_DESC)
3810 bfd_put_32 (output_bfd, 0,
3811 htab->elf.sgot->contents + off);
3812 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3813
3814 loc = sreloc->contents;
3815 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3816 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3817 <= sreloc->contents + sreloc->size);
3818 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3819
3820 if (GOT_TLS_GD_P (tls_type))
3821 {
3822 if (indx == 0)
3823 {
3824 BFD_ASSERT (! unresolved_reloc);
3825 bfd_put_32 (output_bfd,
3826 relocation - elf_i386_dtpoff_base (info),
3827 htab->elf.sgot->contents + off + 4);
3828 }
3829 else
3830 {
3831 bfd_put_32 (output_bfd, 0,
3832 htab->elf.sgot->contents + off + 4);
3833 outrel.r_info = ELF32_R_INFO (indx,
3834 R_386_TLS_DTPOFF32);
3835 outrel.r_offset += 4;
3836 sreloc->reloc_count++;
3837 loc += sizeof (Elf32_External_Rel);
3838 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3839 <= sreloc->contents + sreloc->size);
3840 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3841 }
3842 }
3843 else if (tls_type == GOT_TLS_IE_BOTH)
3844 {
3845 bfd_put_32 (output_bfd,
3846 (indx == 0
3847 ? relocation - elf_i386_dtpoff_base (info)
3848 : 0),
3849 htab->elf.sgot->contents + off + 4);
3850 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3851 outrel.r_offset += 4;
3852 sreloc->reloc_count++;
3853 loc += sizeof (Elf32_External_Rel);
3854 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3855 }
3856
3857 dr_done:
3858 if (h != NULL)
3859 h->got.offset |= 1;
3860 else
3861 local_got_offsets[r_symndx] |= 1;
3862 }
3863
3864 if (off >= (bfd_vma) -2
3865 && ! GOT_TLS_GDESC_P (tls_type))
3866 abort ();
3867 if (r_type == R_386_TLS_GOTDESC
3868 || r_type == R_386_TLS_DESC_CALL)
3869 {
3870 relocation = htab->sgotplt_jump_table_size + offplt;
3871 unresolved_reloc = FALSE;
3872 }
3873 else if (r_type == ELF32_R_TYPE (rel->r_info))
3874 {
3875 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3876 + htab->elf.sgotplt->output_offset;
3877 relocation = htab->elf.sgot->output_section->vma
3878 + htab->elf.sgot->output_offset + off - g_o_t;
3879 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3880 && tls_type == GOT_TLS_IE_BOTH)
3881 relocation += 4;
3882 if (r_type == R_386_TLS_IE)
3883 relocation += g_o_t;
3884 unresolved_reloc = FALSE;
3885 }
3886 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3887 {
3888 unsigned int val, type;
3889 bfd_vma roff;
3890
3891 /* GD->IE transition. */
3892 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3893 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3894 if (type == 0x04)
3895 {
3896 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3897 Change it into:
3898 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3899 val >>= 3;
3900 roff = rel->r_offset - 3;
3901 }
3902 else
3903 {
3904 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3905 Change it into:
3906 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3907 roff = rel->r_offset - 2;
3908 }
3909 memcpy (contents + roff,
3910 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3911 contents[roff + 7] = 0x80 | (val & 7);
3912 /* If foo is used only with foo@gotntpoff(%reg) and
3913 foo@indntpoff, but not with foo@gottpoff(%reg), change
3914 subl $foo@gottpoff(%reg), %eax
3915 into:
3916 addl $foo@gotntpoff(%reg), %eax. */
3917 if (tls_type == GOT_TLS_IE_POS)
3918 contents[roff + 6] = 0x03;
3919 bfd_put_32 (output_bfd,
3920 htab->elf.sgot->output_section->vma
3921 + htab->elf.sgot->output_offset + off
3922 - htab->elf.sgotplt->output_section->vma
3923 - htab->elf.sgotplt->output_offset,
3924 contents + roff + 8);
3925 /* Skip R_386_PLT32. */
3926 rel++;
3927 continue;
3928 }
3929 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3930 {
3931 /* GDesc -> IE transition.
3932 It's originally something like:
3933 leal x@tlsdesc(%ebx), %eax
3934
3935 Change it to:
3936 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3937 or:
3938 movl x@gottpoff(%ebx), %eax # before negl %eax
3939
3940 Registers other than %eax may be set up here. */
3941
3942 bfd_vma roff;
3943
3944 /* First, make sure it's a leal adding ebx to a 32-bit
3945 offset into any register, although it's probably
3946 almost always going to be eax. */
3947 roff = rel->r_offset;
3948
3949 /* Now modify the instruction as appropriate. */
3950 /* To turn a leal into a movl in the form we use it, it
3951 suffices to change the first byte from 0x8d to 0x8b.
3952 aoliva FIXME: should we decide to keep the leal, all
3953 we have to do is remove the statement below, and
3954 adjust the relaxation of R_386_TLS_DESC_CALL. */
3955 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3956
3957 if (tls_type == GOT_TLS_IE_BOTH)
3958 off += 4;
3959
3960 bfd_put_32 (output_bfd,
3961 htab->elf.sgot->output_section->vma
3962 + htab->elf.sgot->output_offset + off
3963 - htab->elf.sgotplt->output_section->vma
3964 - htab->elf.sgotplt->output_offset,
3965 contents + roff);
3966 continue;
3967 }
3968 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3969 {
3970 /* GDesc -> IE transition.
3971 It's originally:
3972 call *(%eax)
3973
3974 Change it to:
3975 xchg %ax,%ax
3976 or
3977 negl %eax
3978 depending on how we transformed the TLS_GOTDESC above.
3979 */
3980
3981 bfd_vma roff;
3982
3983 roff = rel->r_offset;
3984
3985 /* Now modify the instruction as appropriate. */
3986 if (tls_type != GOT_TLS_IE_NEG)
3987 {
3988 /* xchg %ax,%ax */
3989 bfd_put_8 (output_bfd, 0x66, contents + roff);
3990 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3991 }
3992 else
3993 {
3994 /* negl %eax */
3995 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3996 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3997 }
3998
3999 continue;
4000 }
4001 else
4002 BFD_ASSERT (FALSE);
4003 break;
4004
4005 case R_386_TLS_LDM:
4006 if (! elf_i386_tls_transition (info, input_bfd,
4007 input_section, contents,
4008 symtab_hdr, sym_hashes,
4009 &r_type, GOT_UNKNOWN, rel,
4010 relend, h))
4011 return FALSE;
4012
4013 if (r_type != R_386_TLS_LDM)
4014 {
4015 /* LD->LE transition:
4016 leal foo(%reg), %eax; call ___tls_get_addr.
4017 We change it into:
4018 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4019 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4020 memcpy (contents + rel->r_offset - 2,
4021 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4022 /* Skip R_386_PC32/R_386_PLT32. */
4023 rel++;
4024 continue;
4025 }
4026
4027 if (htab->elf.sgot == NULL)
4028 abort ();
4029
4030 off = htab->tls_ldm_got.offset;
4031 if (off & 1)
4032 off &= ~1;
4033 else
4034 {
4035 Elf_Internal_Rela outrel;
4036 bfd_byte *loc;
4037
4038 if (htab->elf.srelgot == NULL)
4039 abort ();
4040
4041 outrel.r_offset = (htab->elf.sgot->output_section->vma
4042 + htab->elf.sgot->output_offset + off);
4043
4044 bfd_put_32 (output_bfd, 0,
4045 htab->elf.sgot->contents + off);
4046 bfd_put_32 (output_bfd, 0,
4047 htab->elf.sgot->contents + off + 4);
4048 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4049 loc = htab->elf.srelgot->contents;
4050 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4051 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4052 htab->tls_ldm_got.offset |= 1;
4053 }
4054 relocation = htab->elf.sgot->output_section->vma
4055 + htab->elf.sgot->output_offset + off
4056 - htab->elf.sgotplt->output_section->vma
4057 - htab->elf.sgotplt->output_offset;
4058 unresolved_reloc = FALSE;
4059 break;
4060
4061 case R_386_TLS_LDO_32:
4062 if (info->shared || (input_section->flags & SEC_CODE) == 0)
4063 relocation -= elf_i386_dtpoff_base (info);
4064 else
4065 /* When converting LDO to LE, we must negate. */
4066 relocation = -elf_i386_tpoff (info, relocation);
4067 break;
4068
4069 case R_386_TLS_LE_32:
4070 case R_386_TLS_LE:
4071 if (info->shared)
4072 {
4073 Elf_Internal_Rela outrel;
4074 asection *sreloc;
4075 bfd_byte *loc;
4076 int indx;
4077
4078 outrel.r_offset = rel->r_offset
4079 + input_section->output_section->vma
4080 + input_section->output_offset;
4081 if (h != NULL && h->dynindx != -1)
4082 indx = h->dynindx;
4083 else
4084 indx = 0;
4085 if (r_type == R_386_TLS_LE_32)
4086 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4087 else
4088 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4089 sreloc = elf_section_data (input_section)->sreloc;
4090 if (sreloc == NULL)
4091 abort ();
4092 loc = sreloc->contents;
4093 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4094 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4095 if (indx)
4096 continue;
4097 else if (r_type == R_386_TLS_LE_32)
4098 relocation = elf_i386_dtpoff_base (info) - relocation;
4099 else
4100 relocation -= elf_i386_dtpoff_base (info);
4101 }
4102 else if (r_type == R_386_TLS_LE_32)
4103 relocation = elf_i386_tpoff (info, relocation);
4104 else
4105 relocation = -elf_i386_tpoff (info, relocation);
4106 break;
4107
4108 default:
4109 break;
4110 }
4111
4112 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4113 because such sections are not SEC_ALLOC and thus ld.so will
4114 not process them. */
4115 if (unresolved_reloc
4116 && !((input_section->flags & SEC_DEBUGGING) != 0
4117 && h->def_dynamic))
4118 {
4119 (*_bfd_error_handler)
4120 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4121 input_bfd,
4122 input_section,
4123 (long) rel->r_offset,
4124 howto->name,
4125 h->root.root.string);
4126 return FALSE;
4127 }
4128
4129 do_relocation:
4130 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4131 contents, rel->r_offset,
4132 relocation, 0);
4133
4134 if (r != bfd_reloc_ok)
4135 {
4136 const char *name;
4137
4138 if (h != NULL)
4139 name = h->root.root.string;
4140 else
4141 {
4142 name = bfd_elf_string_from_elf_section (input_bfd,
4143 symtab_hdr->sh_link,
4144 sym->st_name);
4145 if (name == NULL)
4146 return FALSE;
4147 if (*name == '\0')
4148 name = bfd_section_name (input_bfd, sec);
4149 }
4150
4151 if (r == bfd_reloc_overflow)
4152 {
4153 if (! ((*info->callbacks->reloc_overflow)
4154 (info, (h ? &h->root : NULL), name, howto->name,
4155 (bfd_vma) 0, input_bfd, input_section,
4156 rel->r_offset)))
4157 return FALSE;
4158 }
4159 else
4160 {
4161 (*_bfd_error_handler)
4162 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4163 input_bfd, input_section,
4164 (long) rel->r_offset, name, (int) r);
4165 return FALSE;
4166 }
4167 }
4168 }
4169
4170 return TRUE;
4171 }
4172
4173 /* Finish up dynamic symbol handling. We set the contents of various
4174 dynamic sections here. */
4175
4176 static bfd_boolean
4177 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4178 struct bfd_link_info *info,
4179 struct elf_link_hash_entry *h,
4180 Elf_Internal_Sym *sym)
4181 {
4182 struct elf_i386_link_hash_table *htab;
4183
4184 htab = elf_i386_hash_table (info);
4185
4186 if (h->plt.offset != (bfd_vma) -1)
4187 {
4188 bfd_vma plt_index;
4189 bfd_vma got_offset;
4190 Elf_Internal_Rela rel;
4191 bfd_byte *loc;
4192 asection *plt, *gotplt, *relplt;
4193
4194 /* When building a static executable, use .iplt, .igot.plt and
4195 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4196 if (htab->elf.splt != NULL)
4197 {
4198 plt = htab->elf.splt;
4199 gotplt = htab->elf.sgotplt;
4200 relplt = htab->elf.srelplt;
4201 }
4202 else
4203 {
4204 plt = htab->elf.iplt;
4205 gotplt = htab->elf.igotplt;
4206 relplt = htab->elf.irelplt;
4207 }
4208
4209 /* This symbol has an entry in the procedure linkage table. Set
4210 it up. */
4211
4212 if ((h->dynindx == -1
4213 && !((h->forced_local || info->executable)
4214 && h->def_regular
4215 && h->type == STT_GNU_IFUNC))
4216 || plt == NULL
4217 || gotplt == NULL
4218 || relplt == NULL)
4219 abort ();
4220
4221 /* Get the index in the procedure linkage table which
4222 corresponds to this symbol. This is the index of this symbol
4223 in all the symbols for which we are making plt entries. The
4224 first entry in the procedure linkage table is reserved.
4225
4226 Get the offset into the .got table of the entry that
4227 corresponds to this function. Each .got entry is 4 bytes.
4228 The first three are reserved.
4229
4230 For static executables, we don't reserve anything. */
4231
4232 if (plt == htab->elf.splt)
4233 {
4234 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
4235 got_offset = (plt_index + 3) * 4;
4236 }
4237 else
4238 {
4239 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
4240 got_offset = plt_index * 4;
4241 }
4242
4243 /* Fill in the entry in the procedure linkage table. */
4244 if (! info->shared)
4245 {
4246 memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry,
4247 PLT_ENTRY_SIZE);
4248 bfd_put_32 (output_bfd,
4249 (gotplt->output_section->vma
4250 + gotplt->output_offset
4251 + got_offset),
4252 plt->contents + h->plt.offset + 2);
4253
4254 if (htab->is_vxworks)
4255 {
4256 int s, k, reloc_index;
4257
4258 /* Create the R_386_32 relocation referencing the GOT
4259 for this PLT entry. */
4260
4261 /* S: Current slot number (zero-based). */
4262 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
4263 /* K: Number of relocations for PLTResolve. */
4264 if (info->shared)
4265 k = PLTRESOLVE_RELOCS_SHLIB;
4266 else
4267 k = PLTRESOLVE_RELOCS;
4268 /* Skip the PLTresolve relocations, and the relocations for
4269 the other PLT slots. */
4270 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4271 loc = (htab->srelplt2->contents + reloc_index
4272 * sizeof (Elf32_External_Rel));
4273
4274 rel.r_offset = (htab->elf.splt->output_section->vma
4275 + htab->elf.splt->output_offset
4276 + h->plt.offset + 2),
4277 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4278 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4279
4280 /* Create the R_386_32 relocation referencing the beginning of
4281 the PLT for this GOT entry. */
4282 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4283 + htab->elf.sgotplt->output_offset
4284 + got_offset);
4285 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4286 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4287 loc + sizeof (Elf32_External_Rel));
4288 }
4289 }
4290 else
4291 {
4292 memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry,
4293 PLT_ENTRY_SIZE);
4294 bfd_put_32 (output_bfd, got_offset,
4295 plt->contents + h->plt.offset + 2);
4296 }
4297
4298 /* Don't fill PLT entry for static executables. */
4299 if (plt == htab->elf.splt)
4300 {
4301 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4302 plt->contents + h->plt.offset + 7);
4303 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
4304 plt->contents + h->plt.offset + 12);
4305 }
4306
4307 /* Fill in the entry in the global offset table. */
4308 bfd_put_32 (output_bfd,
4309 (plt->output_section->vma
4310 + plt->output_offset
4311 + h->plt.offset
4312 + 6),
4313 gotplt->contents + got_offset);
4314
4315 /* Fill in the entry in the .rel.plt section. */
4316 rel.r_offset = (gotplt->output_section->vma
4317 + gotplt->output_offset
4318 + got_offset);
4319 if (h->dynindx == -1
4320 || ((info->executable
4321 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4322 && h->def_regular
4323 && h->type == STT_GNU_IFUNC))
4324 {
4325 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4326 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4327 in the .got.plt section. */
4328 bfd_put_32 (output_bfd,
4329 (h->root.u.def.value
4330 + h->root.u.def.section->output_section->vma
4331 + h->root.u.def.section->output_offset),
4332 gotplt->contents + got_offset);
4333 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4334 }
4335 else
4336 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4337 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4338 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4339
4340 if (!h->def_regular)
4341 {
4342 /* Mark the symbol as undefined, rather than as defined in
4343 the .plt section. Leave the value if there were any
4344 relocations where pointer equality matters (this is a clue
4345 for the dynamic linker, to make function pointer
4346 comparisons work between an application and shared
4347 library), otherwise set it to zero. If a function is only
4348 called from a binary, there is no need to slow down
4349 shared libraries because of that. */
4350 sym->st_shndx = SHN_UNDEF;
4351 if (!h->pointer_equality_needed)
4352 sym->st_value = 0;
4353 }
4354 }
4355
4356 if (h->got.offset != (bfd_vma) -1
4357 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4358 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4359 {
4360 Elf_Internal_Rela rel;
4361 bfd_byte *loc;
4362
4363 /* This symbol has an entry in the global offset table. Set it
4364 up. */
4365
4366 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4367 abort ();
4368
4369 rel.r_offset = (htab->elf.sgot->output_section->vma
4370 + htab->elf.sgot->output_offset
4371 + (h->got.offset & ~(bfd_vma) 1));
4372
4373 /* If this is a static link, or it is a -Bsymbolic link and the
4374 symbol is defined locally or was forced to be local because
4375 of a version file, we just want to emit a RELATIVE reloc.
4376 The entry in the global offset table will already have been
4377 initialized in the relocate_section function. */
4378 if (h->def_regular
4379 && h->type == STT_GNU_IFUNC)
4380 {
4381 if (info->shared)
4382 {
4383 /* Generate R_386_GLOB_DAT. */
4384 goto do_glob_dat;
4385 }
4386 else
4387 {
4388 if (!h->pointer_equality_needed)
4389 abort ();
4390
4391 /* For non-shared object, we can't use .got.plt, which
4392 contains the real function addres if we need pointer
4393 equality. We load the GOT entry with the PLT entry. */
4394 asection *plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4395 bfd_put_32 (output_bfd,
4396 (plt->output_section->vma
4397 + plt->output_offset + h->plt.offset),
4398 htab->elf.sgot->contents + h->got.offset);
4399 return TRUE;
4400 }
4401 }
4402 else if (info->shared
4403 && SYMBOL_REFERENCES_LOCAL (info, h))
4404 {
4405 BFD_ASSERT((h->got.offset & 1) != 0);
4406 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4407 }
4408 else
4409 {
4410 BFD_ASSERT((h->got.offset & 1) == 0);
4411 do_glob_dat:
4412 bfd_put_32 (output_bfd, (bfd_vma) 0,
4413 htab->elf.sgot->contents + h->got.offset);
4414 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4415 }
4416
4417 loc = htab->elf.srelgot->contents;
4418 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4419 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4420 }
4421
4422 if (h->needs_copy)
4423 {
4424 Elf_Internal_Rela rel;
4425 bfd_byte *loc;
4426
4427 /* This symbol needs a copy reloc. Set it up. */
4428
4429 if (h->dynindx == -1
4430 || (h->root.type != bfd_link_hash_defined
4431 && h->root.type != bfd_link_hash_defweak)
4432 || htab->srelbss == NULL)
4433 abort ();
4434
4435 rel.r_offset = (h->root.u.def.value
4436 + h->root.u.def.section->output_section->vma
4437 + h->root.u.def.section->output_offset);
4438 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4439 loc = htab->srelbss->contents;
4440 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4441 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4442 }
4443
4444 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4445 be NULL for local symbols.
4446
4447 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4448 is relative to the ".got" section. */
4449 if (sym != NULL
4450 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4451 || (!htab->is_vxworks && h == htab->elf.hgot)))
4452 sym->st_shndx = SHN_ABS;
4453
4454 return TRUE;
4455 }
4456
4457 /* Finish up local dynamic symbol handling. We set the contents of
4458 various dynamic sections here. */
4459
4460 static bfd_boolean
4461 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4462 {
4463 struct elf_link_hash_entry *h
4464 = (struct elf_link_hash_entry *) *slot;
4465 struct bfd_link_info *info
4466 = (struct bfd_link_info *) inf;
4467
4468 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4469 h, NULL);
4470 }
4471
4472 /* Used to decide how to sort relocs in an optimal manner for the
4473 dynamic linker, before writing them out. */
4474
4475 static enum elf_reloc_type_class
4476 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4477 {
4478 switch (ELF32_R_TYPE (rela->r_info))
4479 {
4480 case R_386_RELATIVE:
4481 return reloc_class_relative;
4482 case R_386_JUMP_SLOT:
4483 return reloc_class_plt;
4484 case R_386_COPY:
4485 return reloc_class_copy;
4486 default:
4487 return reloc_class_normal;
4488 }
4489 }
4490
4491 /* Finish up the dynamic sections. */
4492
4493 static bfd_boolean
4494 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4495 struct bfd_link_info *info)
4496 {
4497 struct elf_i386_link_hash_table *htab;
4498 bfd *dynobj;
4499 asection *sdyn;
4500
4501 htab = elf_i386_hash_table (info);
4502 dynobj = htab->elf.dynobj;
4503 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4504
4505 if (htab->elf.dynamic_sections_created)
4506 {
4507 Elf32_External_Dyn *dyncon, *dynconend;
4508
4509 if (sdyn == NULL || htab->elf.sgot == NULL)
4510 abort ();
4511
4512 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4513 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4514 for (; dyncon < dynconend; dyncon++)
4515 {
4516 Elf_Internal_Dyn dyn;
4517 asection *s;
4518
4519 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4520
4521 switch (dyn.d_tag)
4522 {
4523 default:
4524 if (htab->is_vxworks
4525 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4526 break;
4527 continue;
4528
4529 case DT_PLTGOT:
4530 s = htab->elf.sgotplt;
4531 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4532 break;
4533
4534 case DT_JMPREL:
4535 s = htab->elf.srelplt;
4536 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4537 break;
4538
4539 case DT_PLTRELSZ:
4540 s = htab->elf.srelplt;
4541 dyn.d_un.d_val = s->size;
4542 break;
4543
4544 case DT_RELSZ:
4545 /* My reading of the SVR4 ABI indicates that the
4546 procedure linkage table relocs (DT_JMPREL) should be
4547 included in the overall relocs (DT_REL). This is
4548 what Solaris does. However, UnixWare can not handle
4549 that case. Therefore, we override the DT_RELSZ entry
4550 here to make it not include the JMPREL relocs. */
4551 s = htab->elf.srelplt;
4552 if (s == NULL)
4553 continue;
4554 dyn.d_un.d_val -= s->size;
4555 break;
4556
4557 case DT_REL:
4558 /* We may not be using the standard ELF linker script.
4559 If .rel.plt is the first .rel section, we adjust
4560 DT_REL to not include it. */
4561 s = htab->elf.srelplt;
4562 if (s == NULL)
4563 continue;
4564 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4565 continue;
4566 dyn.d_un.d_ptr += s->size;
4567 break;
4568 }
4569
4570 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4571 }
4572
4573 /* Fill in the first entry in the procedure linkage table. */
4574 if (htab->elf.splt && htab->elf.splt->size > 0)
4575 {
4576 if (info->shared)
4577 {
4578 memcpy (htab->elf.splt->contents, elf_i386_pic_plt0_entry,
4579 sizeof (elf_i386_pic_plt0_entry));
4580 memset (htab->elf.splt->contents + sizeof (elf_i386_pic_plt0_entry),
4581 htab->plt0_pad_byte,
4582 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
4583 }
4584 else
4585 {
4586 memcpy (htab->elf.splt->contents, elf_i386_plt0_entry,
4587 sizeof(elf_i386_plt0_entry));
4588 memset (htab->elf.splt->contents + sizeof (elf_i386_plt0_entry),
4589 htab->plt0_pad_byte,
4590 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
4591 bfd_put_32 (output_bfd,
4592 (htab->elf.sgotplt->output_section->vma
4593 + htab->elf.sgotplt->output_offset
4594 + 4),
4595 htab->elf.splt->contents + 2);
4596 bfd_put_32 (output_bfd,
4597 (htab->elf.sgotplt->output_section->vma
4598 + htab->elf.sgotplt->output_offset
4599 + 8),
4600 htab->elf.splt->contents + 8);
4601
4602 if (htab->is_vxworks)
4603 {
4604 Elf_Internal_Rela rel;
4605
4606 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4607 On IA32 we use REL relocations so the addend goes in
4608 the PLT directly. */
4609 rel.r_offset = (htab->elf.splt->output_section->vma
4610 + htab->elf.splt->output_offset
4611 + 2);
4612 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4613 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4614 htab->srelplt2->contents);
4615 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4616 rel.r_offset = (htab->elf.splt->output_section->vma
4617 + htab->elf.splt->output_offset
4618 + 8);
4619 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4620 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4621 htab->srelplt2->contents +
4622 sizeof (Elf32_External_Rel));
4623 }
4624 }
4625
4626 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4627 really seem like the right value. */
4628 elf_section_data (htab->elf.splt->output_section)
4629 ->this_hdr.sh_entsize = 4;
4630
4631 /* Correct the .rel.plt.unloaded relocations. */
4632 if (htab->is_vxworks && !info->shared)
4633 {
4634 int num_plts = (htab->elf.splt->size / PLT_ENTRY_SIZE) - 1;
4635 unsigned char *p;
4636
4637 p = htab->srelplt2->contents;
4638 if (info->shared)
4639 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4640 else
4641 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4642
4643 for (; num_plts; num_plts--)
4644 {
4645 Elf_Internal_Rela rel;
4646 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4647 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4648 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4649 p += sizeof (Elf32_External_Rel);
4650
4651 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4652 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4653 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4654 p += sizeof (Elf32_External_Rel);
4655 }
4656 }
4657 }
4658 }
4659
4660 if (htab->elf.sgotplt)
4661 {
4662 /* Fill in the first three entries in the global offset table. */
4663 if (htab->elf.sgotplt->size > 0)
4664 {
4665 bfd_put_32 (output_bfd,
4666 (sdyn == NULL ? 0
4667 : sdyn->output_section->vma + sdyn->output_offset),
4668 htab->elf.sgotplt->contents);
4669 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4670 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4671 }
4672
4673 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4674 }
4675
4676 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4677 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4678
4679 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4680 htab_traverse (htab->loc_hash_table,
4681 elf_i386_finish_local_dynamic_symbol,
4682 info);
4683
4684 return TRUE;
4685 }
4686
4687 /* Return address for Ith PLT stub in section PLT, for relocation REL
4688 or (bfd_vma) -1 if it should not be included. */
4689
4690 static bfd_vma
4691 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4692 const arelent *rel ATTRIBUTE_UNUSED)
4693 {
4694 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4695 }
4696
4697 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4698
4699 static bfd_boolean
4700 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4701 {
4702 if (h->plt.offset != (bfd_vma) -1
4703 && !h->def_regular
4704 && !h->pointer_equality_needed)
4705 return FALSE;
4706
4707 return _bfd_elf_hash_symbol (h);
4708 }
4709
4710 /* Hook called by the linker routine which adds symbols from an object
4711 file. */
4712
4713 static bfd_boolean
4714 elf_i386_add_symbol_hook (bfd * abfd ATTRIBUTE_UNUSED,
4715 struct bfd_link_info * info ATTRIBUTE_UNUSED,
4716 Elf_Internal_Sym * sym,
4717 const char ** namep ATTRIBUTE_UNUSED,
4718 flagword * flagsp ATTRIBUTE_UNUSED,
4719 asection ** secp ATTRIBUTE_UNUSED,
4720 bfd_vma * valp ATTRIBUTE_UNUSED)
4721 {
4722 if (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
4723 elf_tdata (info->output_bfd)->has_ifunc_symbols = TRUE;
4724
4725 return TRUE;
4726 }
4727
4728 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4729 #define TARGET_LITTLE_NAME "elf32-i386"
4730 #define ELF_ARCH bfd_arch_i386
4731 #define ELF_MACHINE_CODE EM_386
4732 #define ELF_MAXPAGESIZE 0x1000
4733
4734 #define elf_backend_can_gc_sections 1
4735 #define elf_backend_can_refcount 1
4736 #define elf_backend_want_got_plt 1
4737 #define elf_backend_plt_readonly 1
4738 #define elf_backend_want_plt_sym 0
4739 #define elf_backend_got_header_size 12
4740
4741 /* Support RELA for objdump of prelink objects. */
4742 #define elf_info_to_howto elf_i386_info_to_howto_rel
4743 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4744
4745 #define bfd_elf32_mkobject elf_i386_mkobject
4746
4747 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4748 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4749 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4750 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4751 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4752
4753 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4754 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4755 #define elf_backend_check_relocs elf_i386_check_relocs
4756 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4757 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4758 #define elf_backend_fake_sections elf_i386_fake_sections
4759 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4760 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4761 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4762 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4763 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4764 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4765 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4766 #define elf_backend_relocate_section elf_i386_relocate_section
4767 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4768 #define elf_backend_always_size_sections elf_i386_always_size_sections
4769 #define elf_backend_omit_section_dynsym \
4770 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4771 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4772 #define elf_backend_hash_symbol elf_i386_hash_symbol
4773 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4774 #undef elf_backend_post_process_headers
4775 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4776
4777 #include "elf32-target.h"
4778
4779 /* FreeBSD support. */
4780
4781 #undef TARGET_LITTLE_SYM
4782 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4783 #undef TARGET_LITTLE_NAME
4784 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4785 #undef ELF_OSABI
4786 #define ELF_OSABI ELFOSABI_FREEBSD
4787
4788 /* The kernel recognizes executables as valid only if they carry a
4789 "FreeBSD" label in the ELF header. So we put this label on all
4790 executables and (for simplicity) also all other object files. */
4791
4792 static void
4793 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4794 {
4795 _bfd_elf_set_osabi (abfd, info);
4796
4797 #ifdef OLD_FREEBSD_ABI_LABEL
4798 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4799 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4800 #endif
4801 }
4802
4803 #undef elf_backend_post_process_headers
4804 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4805 #undef elf32_bed
4806 #define elf32_bed elf32_i386_fbsd_bed
4807
4808 #undef elf_backend_add_symbol_hook
4809
4810 #include "elf32-target.h"
4811
4812 /* VxWorks support. */
4813
4814 #undef TARGET_LITTLE_SYM
4815 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4816 #undef TARGET_LITTLE_NAME
4817 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4818 #undef ELF_OSABI
4819
4820 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4821
4822 static struct bfd_link_hash_table *
4823 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4824 {
4825 struct bfd_link_hash_table *ret;
4826 struct elf_i386_link_hash_table *htab;
4827
4828 ret = elf_i386_link_hash_table_create (abfd);
4829 if (ret)
4830 {
4831 htab = (struct elf_i386_link_hash_table *) ret;
4832 htab->is_vxworks = 1;
4833 htab->plt0_pad_byte = 0x90;
4834 }
4835
4836 return ret;
4837 }
4838
4839
4840 #undef elf_backend_relocs_compatible
4841 #undef elf_backend_post_process_headers
4842 #undef bfd_elf32_bfd_link_hash_table_create
4843 #define bfd_elf32_bfd_link_hash_table_create \
4844 elf_i386_vxworks_link_hash_table_create
4845 #undef elf_backend_add_symbol_hook
4846 #define elf_backend_add_symbol_hook \
4847 elf_vxworks_add_symbol_hook
4848 #undef elf_backend_link_output_symbol_hook
4849 #define elf_backend_link_output_symbol_hook \
4850 elf_vxworks_link_output_symbol_hook
4851 #undef elf_backend_emit_relocs
4852 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4853 #undef elf_backend_final_write_processing
4854 #define elf_backend_final_write_processing \
4855 elf_vxworks_final_write_processing
4856
4857 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4858 define it. */
4859 #undef elf_backend_want_plt_sym
4860 #define elf_backend_want_plt_sym 1
4861
4862 #undef elf32_bed
4863 #define elf32_bed elf32_i386_vxworks_bed
4864
4865 #include "elf32-target.h"