Skip local IFUNC symbols when checking dynamic relocs in read-only sections.
[binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
3 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "bfdlink.h"
26 #include "libbfd.h"
27 #include "elf-bfd.h"
28 #include "elf-vxworks.h"
29 #include "bfd_stdint.h"
30 #include "objalloc.h"
31 #include "hashtab.h"
32
33 /* 386 uses REL relocations instead of RELA. */
34 #define USE_REL 1
35
36 #include "elf/i386.h"
37
38 static reloc_howto_type elf_howto_table[]=
39 {
40 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_NONE",
42 TRUE, 0x00000000, 0x00000000, FALSE),
43 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PC32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_GOT32",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_PLT32",
54 TRUE, 0xffffffff, 0xffffffff, TRUE),
55 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_COPY",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_RELATIVE",
66 TRUE, 0xffffffff, 0xffffffff, FALSE),
67 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
68 bfd_elf_generic_reloc, "R_386_GOTOFF",
69 TRUE, 0xffffffff, 0xffffffff, FALSE),
70 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
71 bfd_elf_generic_reloc, "R_386_GOTPC",
72 TRUE, 0xffffffff, 0xffffffff, TRUE),
73
74 /* We have a gap in the reloc numbers here.
75 R_386_standard counts the number up to this point, and
76 R_386_ext_offset is the value to subtract from a reloc type of
77 R_386_16 thru R_386_PC8 to form an index into this table. */
78 #define R_386_standard (R_386_GOTPC + 1)
79 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
80
81 /* These relocs are a GNU extension. */
82 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_IE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LE",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_TLS_GD",
96 TRUE, 0xffffffff, 0xffffffff, FALSE),
97 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_TLS_LDM",
99 TRUE, 0xffffffff, 0xffffffff, FALSE),
100 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_16",
102 TRUE, 0xffff, 0xffff, FALSE),
103 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
104 bfd_elf_generic_reloc, "R_386_PC16",
105 TRUE, 0xffff, 0xffff, TRUE),
106 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
107 bfd_elf_generic_reloc, "R_386_8",
108 TRUE, 0xff, 0xff, FALSE),
109 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
110 bfd_elf_generic_reloc, "R_386_PC8",
111 TRUE, 0xff, 0xff, TRUE),
112
113 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
114 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
115 /* These are common with Solaris TLS implementation. */
116 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
129 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 EMPTY_HOWTO (38),
135 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
136 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
139 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
140 FALSE, 0, 0, FALSE),
141 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC",
143 TRUE, 0xffffffff, 0xffffffff, FALSE),
144 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_IRELATIVE",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147
148 /* Another gap. */
149 #define R_386_irelative (R_386_IRELATIVE + 1 - R_386_tls_offset)
150 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_irelative)
151
152 /* GNU extension to record C++ vtable hierarchy. */
153 HOWTO (R_386_GNU_VTINHERIT, /* type */
154 0, /* rightshift */
155 2, /* size (0 = byte, 1 = short, 2 = long) */
156 0, /* bitsize */
157 FALSE, /* pc_relative */
158 0, /* bitpos */
159 complain_overflow_dont, /* complain_on_overflow */
160 NULL, /* special_function */
161 "R_386_GNU_VTINHERIT", /* name */
162 FALSE, /* partial_inplace */
163 0, /* src_mask */
164 0, /* dst_mask */
165 FALSE), /* pcrel_offset */
166
167 /* GNU extension to record C++ vtable member usage. */
168 HOWTO (R_386_GNU_VTENTRY, /* type */
169 0, /* rightshift */
170 2, /* size (0 = byte, 1 = short, 2 = long) */
171 0, /* bitsize */
172 FALSE, /* pc_relative */
173 0, /* bitpos */
174 complain_overflow_dont, /* complain_on_overflow */
175 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
176 "R_386_GNU_VTENTRY", /* name */
177 FALSE, /* partial_inplace */
178 0, /* src_mask */
179 0, /* dst_mask */
180 FALSE) /* pcrel_offset */
181
182 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
183
184 };
185
186 #ifdef DEBUG_GEN_RELOC
187 #define TRACE(str) \
188 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
189 #else
190 #define TRACE(str)
191 #endif
192
193 static reloc_howto_type *
194 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
195 bfd_reloc_code_real_type code)
196 {
197 switch (code)
198 {
199 case BFD_RELOC_NONE:
200 TRACE ("BFD_RELOC_NONE");
201 return &elf_howto_table[R_386_NONE];
202
203 case BFD_RELOC_32:
204 TRACE ("BFD_RELOC_32");
205 return &elf_howto_table[R_386_32];
206
207 case BFD_RELOC_CTOR:
208 TRACE ("BFD_RELOC_CTOR");
209 return &elf_howto_table[R_386_32];
210
211 case BFD_RELOC_32_PCREL:
212 TRACE ("BFD_RELOC_PC32");
213 return &elf_howto_table[R_386_PC32];
214
215 case BFD_RELOC_386_GOT32:
216 TRACE ("BFD_RELOC_386_GOT32");
217 return &elf_howto_table[R_386_GOT32];
218
219 case BFD_RELOC_386_PLT32:
220 TRACE ("BFD_RELOC_386_PLT32");
221 return &elf_howto_table[R_386_PLT32];
222
223 case BFD_RELOC_386_COPY:
224 TRACE ("BFD_RELOC_386_COPY");
225 return &elf_howto_table[R_386_COPY];
226
227 case BFD_RELOC_386_GLOB_DAT:
228 TRACE ("BFD_RELOC_386_GLOB_DAT");
229 return &elf_howto_table[R_386_GLOB_DAT];
230
231 case BFD_RELOC_386_JUMP_SLOT:
232 TRACE ("BFD_RELOC_386_JUMP_SLOT");
233 return &elf_howto_table[R_386_JUMP_SLOT];
234
235 case BFD_RELOC_386_RELATIVE:
236 TRACE ("BFD_RELOC_386_RELATIVE");
237 return &elf_howto_table[R_386_RELATIVE];
238
239 case BFD_RELOC_386_GOTOFF:
240 TRACE ("BFD_RELOC_386_GOTOFF");
241 return &elf_howto_table[R_386_GOTOFF];
242
243 case BFD_RELOC_386_GOTPC:
244 TRACE ("BFD_RELOC_386_GOTPC");
245 return &elf_howto_table[R_386_GOTPC];
246
247 /* These relocs are a GNU extension. */
248 case BFD_RELOC_386_TLS_TPOFF:
249 TRACE ("BFD_RELOC_386_TLS_TPOFF");
250 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
251
252 case BFD_RELOC_386_TLS_IE:
253 TRACE ("BFD_RELOC_386_TLS_IE");
254 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_GOTIE:
257 TRACE ("BFD_RELOC_386_TLS_GOTIE");
258 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_LE:
261 TRACE ("BFD_RELOC_386_TLS_LE");
262 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_GD:
265 TRACE ("BFD_RELOC_386_TLS_GD");
266 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
267
268 case BFD_RELOC_386_TLS_LDM:
269 TRACE ("BFD_RELOC_386_TLS_LDM");
270 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
271
272 case BFD_RELOC_16:
273 TRACE ("BFD_RELOC_16");
274 return &elf_howto_table[R_386_16 - R_386_ext_offset];
275
276 case BFD_RELOC_16_PCREL:
277 TRACE ("BFD_RELOC_16_PCREL");
278 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
279
280 case BFD_RELOC_8:
281 TRACE ("BFD_RELOC_8");
282 return &elf_howto_table[R_386_8 - R_386_ext_offset];
283
284 case BFD_RELOC_8_PCREL:
285 TRACE ("BFD_RELOC_8_PCREL");
286 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
287
288 /* Common with Sun TLS implementation. */
289 case BFD_RELOC_386_TLS_LDO_32:
290 TRACE ("BFD_RELOC_386_TLS_LDO_32");
291 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
292
293 case BFD_RELOC_386_TLS_IE_32:
294 TRACE ("BFD_RELOC_386_TLS_IE_32");
295 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_LE_32:
298 TRACE ("BFD_RELOC_386_TLS_LE_32");
299 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_DTPMOD32:
302 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
303 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_DTPOFF32:
306 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
307 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
308
309 case BFD_RELOC_386_TLS_TPOFF32:
310 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
311 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_GOTDESC:
314 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
315 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
316
317 case BFD_RELOC_386_TLS_DESC_CALL:
318 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
319 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_DESC:
322 TRACE ("BFD_RELOC_386_TLS_DESC");
323 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_IRELATIVE:
326 TRACE ("BFD_RELOC_386_IRELATIVE");
327 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
328
329 case BFD_RELOC_VTABLE_INHERIT:
330 TRACE ("BFD_RELOC_VTABLE_INHERIT");
331 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
332
333 case BFD_RELOC_VTABLE_ENTRY:
334 TRACE ("BFD_RELOC_VTABLE_ENTRY");
335 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
336
337 default:
338 break;
339 }
340
341 TRACE ("Unknown");
342 return 0;
343 }
344
345 static reloc_howto_type *
346 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
347 const char *r_name)
348 {
349 unsigned int i;
350
351 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
352 if (elf_howto_table[i].name != NULL
353 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
354 return &elf_howto_table[i];
355
356 return NULL;
357 }
358
359 static reloc_howto_type *
360 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
361 {
362 unsigned int indx;
363
364 if ((indx = r_type) >= R_386_standard
365 && ((indx = r_type - R_386_ext_offset) - R_386_standard
366 >= R_386_ext - R_386_standard)
367 && ((indx = r_type - R_386_tls_offset) - R_386_ext
368 >= R_386_irelative - R_386_ext)
369 && ((indx = r_type - R_386_vt_offset) - R_386_irelative
370 >= R_386_vt - R_386_irelative))
371 {
372 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
373 abfd, (int) r_type);
374 indx = R_386_NONE;
375 }
376 BFD_ASSERT (elf_howto_table [indx].type == r_type);
377 return &elf_howto_table[indx];
378 }
379
380 static void
381 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
382 arelent *cache_ptr,
383 Elf_Internal_Rela *dst)
384 {
385 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
386 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
387 }
388
389 /* Return whether a symbol name implies a local label. The UnixWare
390 2.1 cc generates temporary symbols that start with .X, so we
391 recognize them here. FIXME: do other SVR4 compilers also use .X?.
392 If so, we should move the .X recognition into
393 _bfd_elf_is_local_label_name. */
394
395 static bfd_boolean
396 elf_i386_is_local_label_name (bfd *abfd, const char *name)
397 {
398 if (name[0] == '.' && name[1] == 'X')
399 return TRUE;
400
401 return _bfd_elf_is_local_label_name (abfd, name);
402 }
403 \f
404 /* Support for core dump NOTE sections. */
405
406 static bfd_boolean
407 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
408 {
409 int offset;
410 size_t size;
411
412 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
413 {
414 int pr_version = bfd_get_32 (abfd, note->descdata);
415
416 if (pr_version != 1)
417 return FALSE;
418
419 /* pr_cursig */
420 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
421
422 /* pr_pid */
423 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
424
425 /* pr_reg */
426 offset = 28;
427 size = bfd_get_32 (abfd, note->descdata + 8);
428 }
429 else
430 {
431 switch (note->descsz)
432 {
433 default:
434 return FALSE;
435
436 case 144: /* Linux/i386 */
437 /* pr_cursig */
438 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
439
440 /* pr_pid */
441 elf_tdata (abfd)->core_lwpid = bfd_get_32 (abfd, note->descdata + 24);
442
443 /* pr_reg */
444 offset = 72;
445 size = 68;
446
447 break;
448 }
449 }
450
451 /* Make a ".reg/999" section. */
452 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
453 size, note->descpos + offset);
454 }
455
456 static bfd_boolean
457 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
458 {
459 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
460 {
461 int pr_version = bfd_get_32 (abfd, note->descdata);
462
463 if (pr_version != 1)
464 return FALSE;
465
466 elf_tdata (abfd)->core_program
467 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
468 elf_tdata (abfd)->core_command
469 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
470 }
471 else
472 {
473 switch (note->descsz)
474 {
475 default:
476 return FALSE;
477
478 case 124: /* Linux/i386 elf_prpsinfo. */
479 elf_tdata (abfd)->core_pid
480 = bfd_get_32 (abfd, note->descdata + 12);
481 elf_tdata (abfd)->core_program
482 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
483 elf_tdata (abfd)->core_command
484 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
485 }
486 }
487
488 /* Note that for some reason, a spurious space is tacked
489 onto the end of the args in some (at least one anyway)
490 implementations, so strip it off if it exists. */
491 {
492 char *command = elf_tdata (abfd)->core_command;
493 int n = strlen (command);
494
495 if (0 < n && command[n - 1] == ' ')
496 command[n - 1] = '\0';
497 }
498
499 return TRUE;
500 }
501 \f
502 /* Functions for the i386 ELF linker.
503
504 In order to gain some understanding of code in this file without
505 knowing all the intricate details of the linker, note the
506 following:
507
508 Functions named elf_i386_* are called by external routines, other
509 functions are only called locally. elf_i386_* functions appear
510 in this file more or less in the order in which they are called
511 from external routines. eg. elf_i386_check_relocs is called
512 early in the link process, elf_i386_finish_dynamic_sections is
513 one of the last functions. */
514
515
516 /* The name of the dynamic interpreter. This is put in the .interp
517 section. */
518
519 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
520
521 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
522 copying dynamic variables from a shared lib into an app's dynbss
523 section, and instead use a dynamic relocation to point into the
524 shared lib. */
525 #define ELIMINATE_COPY_RELOCS 1
526
527 /* The size in bytes of an entry in the procedure linkage table. */
528
529 #define PLT_ENTRY_SIZE 16
530
531 /* The first entry in an absolute procedure linkage table looks like
532 this. See the SVR4 ABI i386 supplement to see how this works.
533 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
534
535 static const bfd_byte elf_i386_plt0_entry[12] =
536 {
537 0xff, 0x35, /* pushl contents of address */
538 0, 0, 0, 0, /* replaced with address of .got + 4. */
539 0xff, 0x25, /* jmp indirect */
540 0, 0, 0, 0 /* replaced with address of .got + 8. */
541 };
542
543 /* Subsequent entries in an absolute procedure linkage table look like
544 this. */
545
546 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
547 {
548 0xff, 0x25, /* jmp indirect */
549 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
550 0x68, /* pushl immediate */
551 0, 0, 0, 0, /* replaced with offset into relocation table. */
552 0xe9, /* jmp relative */
553 0, 0, 0, 0 /* replaced with offset to start of .plt. */
554 };
555
556 /* The first entry in a PIC procedure linkage table look like this.
557 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
558
559 static const bfd_byte elf_i386_pic_plt0_entry[12] =
560 {
561 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
562 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
563 };
564
565 /* Subsequent entries in a PIC procedure linkage table look like this. */
566
567 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
568 {
569 0xff, 0xa3, /* jmp *offset(%ebx) */
570 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
571 0x68, /* pushl immediate */
572 0, 0, 0, 0, /* replaced with offset into relocation table. */
573 0xe9, /* jmp relative */
574 0, 0, 0, 0 /* replaced with offset to start of .plt. */
575 };
576
577 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
578 for the PLTResolve stub and then for each PLT entry. */
579 #define PLTRESOLVE_RELOCS_SHLIB 0
580 #define PLTRESOLVE_RELOCS 2
581 #define PLT_NON_JUMP_SLOT_RELOCS 2
582
583 /* i386 ELF linker hash entry. */
584
585 struct elf_i386_link_hash_entry
586 {
587 struct elf_link_hash_entry elf;
588
589 /* Track dynamic relocs copied for this symbol. */
590 struct elf_dyn_relocs *dyn_relocs;
591
592 #define GOT_UNKNOWN 0
593 #define GOT_NORMAL 1
594 #define GOT_TLS_GD 2
595 #define GOT_TLS_IE 4
596 #define GOT_TLS_IE_POS 5
597 #define GOT_TLS_IE_NEG 6
598 #define GOT_TLS_IE_BOTH 7
599 #define GOT_TLS_GDESC 8
600 #define GOT_TLS_GD_BOTH_P(type) \
601 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
602 #define GOT_TLS_GD_P(type) \
603 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
604 #define GOT_TLS_GDESC_P(type) \
605 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
606 #define GOT_TLS_GD_ANY_P(type) \
607 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
608 unsigned char tls_type;
609
610 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
611 starting at the end of the jump table. */
612 bfd_vma tlsdesc_got;
613 };
614
615 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
616
617 struct elf_i386_obj_tdata
618 {
619 struct elf_obj_tdata root;
620
621 /* tls_type for each local got entry. */
622 char *local_got_tls_type;
623
624 /* GOTPLT entries for TLS descriptors. */
625 bfd_vma *local_tlsdesc_gotent;
626 };
627
628 #define elf_i386_tdata(abfd) \
629 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
630
631 #define elf_i386_local_got_tls_type(abfd) \
632 (elf_i386_tdata (abfd)->local_got_tls_type)
633
634 #define elf_i386_local_tlsdesc_gotent(abfd) \
635 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
636
637 #define is_i386_elf(bfd) \
638 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
639 && elf_tdata (bfd) != NULL \
640 && elf_object_id (bfd) == I386_ELF_DATA)
641
642 static bfd_boolean
643 elf_i386_mkobject (bfd *abfd)
644 {
645 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
646 I386_ELF_DATA);
647 }
648
649 /* i386 ELF linker hash table. */
650
651 struct elf_i386_link_hash_table
652 {
653 struct elf_link_hash_table elf;
654
655 /* Short-cuts to get to dynamic linker sections. */
656 asection *sdynbss;
657 asection *srelbss;
658
659 union
660 {
661 bfd_signed_vma refcount;
662 bfd_vma offset;
663 } tls_ldm_got;
664
665 /* The amount of space used by the reserved portion of the sgotplt
666 section, plus whatever space is used by the jump slots. */
667 bfd_vma sgotplt_jump_table_size;
668
669 /* Small local sym cache. */
670 struct sym_cache sym_cache;
671
672 /* _TLS_MODULE_BASE_ symbol. */
673 struct bfd_link_hash_entry *tls_module_base;
674
675 /* Used by local STT_GNU_IFUNC symbols. */
676 htab_t loc_hash_table;
677 void * loc_hash_memory;
678
679 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
680 asection *srelplt2;
681
682 /* True if the target system is VxWorks. */
683 int is_vxworks;
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 /* Value used to fill the last word of the first plt entry. */
689 bfd_byte plt0_pad_byte;
690 };
691
692 /* Get the i386 ELF linker hash table from a link_info structure. */
693
694 #define elf_i386_hash_table(p) \
695 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
696 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
697
698 #define elf_i386_compute_jump_table_size(htab) \
699 ((htab)->next_tls_desc_index * 4)
700
701 /* Create an entry in an i386 ELF linker hash table. */
702
703 static struct bfd_hash_entry *
704 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
705 struct bfd_hash_table *table,
706 const char *string)
707 {
708 /* Allocate the structure if it has not already been allocated by a
709 subclass. */
710 if (entry == NULL)
711 {
712 entry = (struct bfd_hash_entry *)
713 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
714 if (entry == NULL)
715 return entry;
716 }
717
718 /* Call the allocation method of the superclass. */
719 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
720 if (entry != NULL)
721 {
722 struct elf_i386_link_hash_entry *eh;
723
724 eh = (struct elf_i386_link_hash_entry *) entry;
725 eh->dyn_relocs = NULL;
726 eh->tls_type = GOT_UNKNOWN;
727 eh->tlsdesc_got = (bfd_vma) -1;
728 }
729
730 return entry;
731 }
732
733 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
734 for local symbol so that we can handle local STT_GNU_IFUNC symbols
735 as global symbol. We reuse indx and dynstr_index for local symbol
736 hash since they aren't used by global symbols in this backend. */
737
738 static hashval_t
739 elf_i386_local_htab_hash (const void *ptr)
740 {
741 struct elf_link_hash_entry *h
742 = (struct elf_link_hash_entry *) ptr;
743 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
744 }
745
746 /* Compare local hash entries. */
747
748 static int
749 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
750 {
751 struct elf_link_hash_entry *h1
752 = (struct elf_link_hash_entry *) ptr1;
753 struct elf_link_hash_entry *h2
754 = (struct elf_link_hash_entry *) ptr2;
755
756 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
757 }
758
759 /* Find and/or create a hash entry for local symbol. */
760
761 static struct elf_link_hash_entry *
762 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
763 bfd *abfd, const Elf_Internal_Rela *rel,
764 bfd_boolean create)
765 {
766 struct elf_i386_link_hash_entry e, *ret;
767 asection *sec = abfd->sections;
768 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
769 ELF32_R_SYM (rel->r_info));
770 void **slot;
771
772 e.elf.indx = sec->id;
773 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
774 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
775 create ? INSERT : NO_INSERT);
776
777 if (!slot)
778 return NULL;
779
780 if (*slot)
781 {
782 ret = (struct elf_i386_link_hash_entry *) *slot;
783 return &ret->elf;
784 }
785
786 ret = (struct elf_i386_link_hash_entry *)
787 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
788 sizeof (struct elf_i386_link_hash_entry));
789 if (ret)
790 {
791 memset (ret, 0, sizeof (*ret));
792 ret->elf.indx = sec->id;
793 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
794 ret->elf.dynindx = -1;
795 *slot = ret;
796 }
797 return &ret->elf;
798 }
799
800 /* Create an i386 ELF linker hash table. */
801
802 static struct bfd_link_hash_table *
803 elf_i386_link_hash_table_create (bfd *abfd)
804 {
805 struct elf_i386_link_hash_table *ret;
806 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
807
808 ret = (struct elf_i386_link_hash_table *) bfd_malloc (amt);
809 if (ret == NULL)
810 return NULL;
811
812 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
813 elf_i386_link_hash_newfunc,
814 sizeof (struct elf_i386_link_hash_entry),
815 I386_ELF_DATA))
816 {
817 free (ret);
818 return NULL;
819 }
820
821 ret->sdynbss = NULL;
822 ret->srelbss = NULL;
823 ret->tls_ldm_got.refcount = 0;
824 ret->next_tls_desc_index = 0;
825 ret->sgotplt_jump_table_size = 0;
826 ret->sym_cache.abfd = NULL;
827 ret->is_vxworks = 0;
828 ret->srelplt2 = NULL;
829 ret->plt0_pad_byte = 0;
830 ret->tls_module_base = NULL;
831
832 ret->loc_hash_table = htab_try_create (1024,
833 elf_i386_local_htab_hash,
834 elf_i386_local_htab_eq,
835 NULL);
836 ret->loc_hash_memory = objalloc_create ();
837 if (!ret->loc_hash_table || !ret->loc_hash_memory)
838 {
839 free (ret);
840 return NULL;
841 }
842
843 return &ret->elf.root;
844 }
845
846 /* Destroy an i386 ELF linker hash table. */
847
848 static void
849 elf_i386_link_hash_table_free (struct bfd_link_hash_table *hash)
850 {
851 struct elf_i386_link_hash_table *htab
852 = (struct elf_i386_link_hash_table *) hash;
853
854 if (htab->loc_hash_table)
855 htab_delete (htab->loc_hash_table);
856 if (htab->loc_hash_memory)
857 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
858 _bfd_generic_link_hash_table_free (hash);
859 }
860
861 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
862 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
863 hash table. */
864
865 static bfd_boolean
866 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
867 {
868 struct elf_i386_link_hash_table *htab;
869
870 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
871 return FALSE;
872
873 htab = elf_i386_hash_table (info);
874 if (htab == NULL)
875 return FALSE;
876
877 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
878 if (!info->shared)
879 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
880
881 if (!htab->sdynbss
882 || (!info->shared && !htab->srelbss))
883 abort ();
884
885 if (htab->is_vxworks
886 && !elf_vxworks_create_dynamic_sections (dynobj, info,
887 &htab->srelplt2))
888 return FALSE;
889
890 return TRUE;
891 }
892
893 /* Copy the extra info we tack onto an elf_link_hash_entry. */
894
895 static void
896 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
897 struct elf_link_hash_entry *dir,
898 struct elf_link_hash_entry *ind)
899 {
900 struct elf_i386_link_hash_entry *edir, *eind;
901
902 edir = (struct elf_i386_link_hash_entry *) dir;
903 eind = (struct elf_i386_link_hash_entry *) ind;
904
905 if (eind->dyn_relocs != NULL)
906 {
907 if (edir->dyn_relocs != NULL)
908 {
909 struct elf_dyn_relocs **pp;
910 struct elf_dyn_relocs *p;
911
912 /* Add reloc counts against the indirect sym to the direct sym
913 list. Merge any entries against the same section. */
914 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
915 {
916 struct elf_dyn_relocs *q;
917
918 for (q = edir->dyn_relocs; q != NULL; q = q->next)
919 if (q->sec == p->sec)
920 {
921 q->pc_count += p->pc_count;
922 q->count += p->count;
923 *pp = p->next;
924 break;
925 }
926 if (q == NULL)
927 pp = &p->next;
928 }
929 *pp = edir->dyn_relocs;
930 }
931
932 edir->dyn_relocs = eind->dyn_relocs;
933 eind->dyn_relocs = NULL;
934 }
935
936 if (ind->root.type == bfd_link_hash_indirect
937 && dir->got.refcount <= 0)
938 {
939 edir->tls_type = eind->tls_type;
940 eind->tls_type = GOT_UNKNOWN;
941 }
942
943 if (ELIMINATE_COPY_RELOCS
944 && ind->root.type != bfd_link_hash_indirect
945 && dir->dynamic_adjusted)
946 {
947 /* If called to transfer flags for a weakdef during processing
948 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
949 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
950 dir->ref_dynamic |= ind->ref_dynamic;
951 dir->ref_regular |= ind->ref_regular;
952 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
953 dir->needs_plt |= ind->needs_plt;
954 dir->pointer_equality_needed |= ind->pointer_equality_needed;
955 }
956 else
957 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
958 }
959
960 typedef union
961 {
962 unsigned char c[2];
963 uint16_t i;
964 }
965 i386_opcode16;
966
967 /* Return TRUE if the TLS access code sequence support transition
968 from R_TYPE. */
969
970 static bfd_boolean
971 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
972 bfd_byte *contents,
973 Elf_Internal_Shdr *symtab_hdr,
974 struct elf_link_hash_entry **sym_hashes,
975 unsigned int r_type,
976 const Elf_Internal_Rela *rel,
977 const Elf_Internal_Rela *relend)
978 {
979 unsigned int val, type;
980 unsigned long r_symndx;
981 struct elf_link_hash_entry *h;
982 bfd_vma offset;
983
984 /* Get the section contents. */
985 if (contents == NULL)
986 {
987 if (elf_section_data (sec)->this_hdr.contents != NULL)
988 contents = elf_section_data (sec)->this_hdr.contents;
989 else
990 {
991 /* FIXME: How to better handle error condition? */
992 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
993 return FALSE;
994
995 /* Cache the section contents for elf_link_input_bfd. */
996 elf_section_data (sec)->this_hdr.contents = contents;
997 }
998 }
999
1000 offset = rel->r_offset;
1001 switch (r_type)
1002 {
1003 case R_386_TLS_GD:
1004 case R_386_TLS_LDM:
1005 if (offset < 2 || (rel + 1) >= relend)
1006 return FALSE;
1007
1008 type = bfd_get_8 (abfd, contents + offset - 2);
1009 if (r_type == R_386_TLS_GD)
1010 {
1011 /* Check transition from GD access model. Only
1012 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1013 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1014 can transit to different access model. */
1015 if ((offset + 10) > sec->size ||
1016 (type != 0x8d && type != 0x04))
1017 return FALSE;
1018
1019 val = bfd_get_8 (abfd, contents + offset - 1);
1020 if (type == 0x04)
1021 {
1022 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1023 if (offset < 3)
1024 return FALSE;
1025
1026 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1027 return FALSE;
1028
1029 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1030 return FALSE;
1031 }
1032 else
1033 {
1034 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1035 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1036 return FALSE;
1037
1038 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1039 return FALSE;
1040 }
1041 }
1042 else
1043 {
1044 /* Check transition from LD access model. Only
1045 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1046 can transit to different access model. */
1047 if (type != 0x8d || (offset + 9) > sec->size)
1048 return FALSE;
1049
1050 val = bfd_get_8 (abfd, contents + offset - 1);
1051 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1052 return FALSE;
1053 }
1054
1055 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1056 return FALSE;
1057
1058 r_symndx = ELF32_R_SYM (rel[1].r_info);
1059 if (r_symndx < symtab_hdr->sh_info)
1060 return FALSE;
1061
1062 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1063 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1064 may be versioned. */
1065 return (h != NULL
1066 && h->root.root.string != NULL
1067 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1068 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1069 && (strncmp (h->root.root.string, "___tls_get_addr",
1070 15) == 0));
1071
1072 case R_386_TLS_IE:
1073 /* Check transition from IE access model:
1074 movl foo@indntpoff(%rip), %eax
1075 movl foo@indntpoff(%rip), %reg
1076 addl foo@indntpoff(%rip), %reg
1077 */
1078
1079 if (offset < 1 || (offset + 4) > sec->size)
1080 return FALSE;
1081
1082 /* Check "movl foo@tpoff(%rip), %eax" first. */
1083 val = bfd_get_8 (abfd, contents + offset - 1);
1084 if (val == 0xa1)
1085 return TRUE;
1086
1087 if (offset < 2)
1088 return FALSE;
1089
1090 /* Check movl|addl foo@tpoff(%rip), %reg. */
1091 type = bfd_get_8 (abfd, contents + offset - 2);
1092 return ((type == 0x8b || type == 0x03)
1093 && (val & 0xc7) == 0x05);
1094
1095 case R_386_TLS_GOTIE:
1096 case R_386_TLS_IE_32:
1097 /* Check transition from {IE_32,GOTIE} access model:
1098 subl foo@{tpoff,gontoff}(%reg1), %reg2
1099 movl foo@{tpoff,gontoff}(%reg1), %reg2
1100 addl foo@{tpoff,gontoff}(%reg1), %reg2
1101 */
1102
1103 if (offset < 2 || (offset + 4) > sec->size)
1104 return FALSE;
1105
1106 val = bfd_get_8 (abfd, contents + offset - 1);
1107 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1108 return FALSE;
1109
1110 type = bfd_get_8 (abfd, contents + offset - 2);
1111 return type == 0x8b || type == 0x2b || type == 0x03;
1112
1113 case R_386_TLS_GOTDESC:
1114 /* Check transition from GDesc access model:
1115 leal x@tlsdesc(%ebx), %eax
1116
1117 Make sure it's a leal adding ebx to a 32-bit offset
1118 into any register, although it's probably almost always
1119 going to be eax. */
1120
1121 if (offset < 2 || (offset + 4) > sec->size)
1122 return FALSE;
1123
1124 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1125 return FALSE;
1126
1127 val = bfd_get_8 (abfd, contents + offset - 1);
1128 return (val & 0xc7) == 0x83;
1129
1130 case R_386_TLS_DESC_CALL:
1131 /* Check transition from GDesc access model:
1132 call *x@tlsdesc(%rax)
1133 */
1134 if (offset + 2 <= sec->size)
1135 {
1136 /* Make sure that it's a call *x@tlsdesc(%rax). */
1137 static i386_opcode16 call = { { 0xff, 0x10 } };
1138 return bfd_get_16 (abfd, contents + offset) == call.i;
1139 }
1140
1141 return FALSE;
1142
1143 default:
1144 abort ();
1145 }
1146 }
1147
1148 /* Return TRUE if the TLS access transition is OK or no transition
1149 will be performed. Update R_TYPE if there is a transition. */
1150
1151 static bfd_boolean
1152 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1153 asection *sec, bfd_byte *contents,
1154 Elf_Internal_Shdr *symtab_hdr,
1155 struct elf_link_hash_entry **sym_hashes,
1156 unsigned int *r_type, int tls_type,
1157 const Elf_Internal_Rela *rel,
1158 const Elf_Internal_Rela *relend,
1159 struct elf_link_hash_entry *h,
1160 unsigned long r_symndx)
1161 {
1162 unsigned int from_type = *r_type;
1163 unsigned int to_type = from_type;
1164 bfd_boolean check = TRUE;
1165
1166 /* Skip TLS transition for functions. */
1167 if (h != NULL
1168 && (h->type == STT_FUNC
1169 || h->type == STT_GNU_IFUNC))
1170 return TRUE;
1171
1172 switch (from_type)
1173 {
1174 case R_386_TLS_GD:
1175 case R_386_TLS_GOTDESC:
1176 case R_386_TLS_DESC_CALL:
1177 case R_386_TLS_IE_32:
1178 case R_386_TLS_IE:
1179 case R_386_TLS_GOTIE:
1180 if (info->executable)
1181 {
1182 if (h == NULL)
1183 to_type = R_386_TLS_LE_32;
1184 else if (from_type != R_386_TLS_IE
1185 && from_type != R_386_TLS_GOTIE)
1186 to_type = R_386_TLS_IE_32;
1187 }
1188
1189 /* When we are called from elf_i386_relocate_section, CONTENTS
1190 isn't NULL and there may be additional transitions based on
1191 TLS_TYPE. */
1192 if (contents != NULL)
1193 {
1194 unsigned int new_to_type = to_type;
1195
1196 if (info->executable
1197 && h != NULL
1198 && h->dynindx == -1
1199 && (tls_type & GOT_TLS_IE))
1200 new_to_type = R_386_TLS_LE_32;
1201
1202 if (to_type == R_386_TLS_GD
1203 || to_type == R_386_TLS_GOTDESC
1204 || to_type == R_386_TLS_DESC_CALL)
1205 {
1206 if (tls_type == GOT_TLS_IE_POS)
1207 new_to_type = R_386_TLS_GOTIE;
1208 else if (tls_type & GOT_TLS_IE)
1209 new_to_type = R_386_TLS_IE_32;
1210 }
1211
1212 /* We checked the transition before when we were called from
1213 elf_i386_check_relocs. We only want to check the new
1214 transition which hasn't been checked before. */
1215 check = new_to_type != to_type && from_type == to_type;
1216 to_type = new_to_type;
1217 }
1218
1219 break;
1220
1221 case R_386_TLS_LDM:
1222 if (info->executable)
1223 to_type = R_386_TLS_LE_32;
1224 break;
1225
1226 default:
1227 return TRUE;
1228 }
1229
1230 /* Return TRUE if there is no transition. */
1231 if (from_type == to_type)
1232 return TRUE;
1233
1234 /* Check if the transition can be performed. */
1235 if (check
1236 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1237 symtab_hdr, sym_hashes,
1238 from_type, rel, relend))
1239 {
1240 reloc_howto_type *from, *to;
1241 const char *name;
1242
1243 from = elf_i386_rtype_to_howto (abfd, from_type);
1244 to = elf_i386_rtype_to_howto (abfd, to_type);
1245
1246 if (h)
1247 name = h->root.root.string;
1248 else
1249 {
1250 struct elf_i386_link_hash_table *htab;
1251
1252 htab = elf_i386_hash_table (info);
1253 if (htab == NULL)
1254 name = "*unknown*";
1255 else
1256 {
1257 Elf_Internal_Sym *isym;
1258
1259 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1260 abfd, r_symndx);
1261 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1262 }
1263 }
1264
1265 (*_bfd_error_handler)
1266 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1267 "in section `%A' failed"),
1268 abfd, sec, from->name, to->name, name,
1269 (unsigned long) rel->r_offset);
1270 bfd_set_error (bfd_error_bad_value);
1271 return FALSE;
1272 }
1273
1274 *r_type = to_type;
1275 return TRUE;
1276 }
1277
1278 /* Look through the relocs for a section during the first phase, and
1279 calculate needed space in the global offset table, procedure linkage
1280 table, and dynamic reloc sections. */
1281
1282 static bfd_boolean
1283 elf_i386_check_relocs (bfd *abfd,
1284 struct bfd_link_info *info,
1285 asection *sec,
1286 const Elf_Internal_Rela *relocs)
1287 {
1288 struct elf_i386_link_hash_table *htab;
1289 Elf_Internal_Shdr *symtab_hdr;
1290 struct elf_link_hash_entry **sym_hashes;
1291 const Elf_Internal_Rela *rel;
1292 const Elf_Internal_Rela *rel_end;
1293 asection *sreloc;
1294
1295 if (info->relocatable)
1296 return TRUE;
1297
1298 BFD_ASSERT (is_i386_elf (abfd));
1299
1300 htab = elf_i386_hash_table (info);
1301 if (htab == NULL)
1302 return FALSE;
1303
1304 symtab_hdr = &elf_symtab_hdr (abfd);
1305 sym_hashes = elf_sym_hashes (abfd);
1306
1307 sreloc = NULL;
1308
1309 rel_end = relocs + sec->reloc_count;
1310 for (rel = relocs; rel < rel_end; rel++)
1311 {
1312 unsigned int r_type;
1313 unsigned long r_symndx;
1314 struct elf_link_hash_entry *h;
1315 Elf_Internal_Sym *isym;
1316 const char *name;
1317
1318 r_symndx = ELF32_R_SYM (rel->r_info);
1319 r_type = ELF32_R_TYPE (rel->r_info);
1320
1321 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1322 {
1323 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1324 abfd,
1325 r_symndx);
1326 return FALSE;
1327 }
1328
1329 if (r_symndx < symtab_hdr->sh_info)
1330 {
1331 /* A local symbol. */
1332 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1333 abfd, r_symndx);
1334 if (isym == NULL)
1335 return FALSE;
1336
1337 /* Check relocation against local STT_GNU_IFUNC symbol. */
1338 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1339 {
1340 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1341 if (h == NULL)
1342 return FALSE;
1343
1344 /* Fake a STT_GNU_IFUNC symbol. */
1345 h->type = STT_GNU_IFUNC;
1346 h->def_regular = 1;
1347 h->ref_regular = 1;
1348 h->forced_local = 1;
1349 h->root.type = bfd_link_hash_defined;
1350 }
1351 else
1352 h = NULL;
1353 }
1354 else
1355 {
1356 isym = NULL;
1357 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1358 while (h->root.type == bfd_link_hash_indirect
1359 || h->root.type == bfd_link_hash_warning)
1360 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1361 }
1362
1363 if (h != NULL)
1364 {
1365 /* Create the ifunc sections for static executables. If we
1366 never see an indirect function symbol nor we are building
1367 a static executable, those sections will be empty and
1368 won't appear in output. */
1369 switch (r_type)
1370 {
1371 default:
1372 break;
1373
1374 case R_386_32:
1375 case R_386_PC32:
1376 case R_386_PLT32:
1377 case R_386_GOT32:
1378 case R_386_GOTOFF:
1379 if (!_bfd_elf_create_ifunc_sections (abfd, info))
1380 return FALSE;
1381 break;
1382 }
1383
1384 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
1385 it here if it is defined in a non-shared object. */
1386 if (h->type == STT_GNU_IFUNC
1387 && h->def_regular)
1388 {
1389 /* It is referenced by a non-shared object. */
1390 h->ref_regular = 1;
1391 h->needs_plt = 1;
1392
1393 /* STT_GNU_IFUNC symbol must go through PLT. */
1394 h->plt.refcount += 1;
1395
1396 /* STT_GNU_IFUNC needs dynamic sections. */
1397 if (htab->elf.dynobj == NULL)
1398 htab->elf.dynobj = abfd;
1399
1400 switch (r_type)
1401 {
1402 default:
1403 if (h->root.root.string)
1404 name = h->root.root.string;
1405 else
1406 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1407 NULL);
1408 (*_bfd_error_handler)
1409 (_("%B: relocation %s against STT_GNU_IFUNC "
1410 "symbol `%s' isn't handled by %s"), abfd,
1411 elf_howto_table[r_type].name,
1412 name, __FUNCTION__);
1413 bfd_set_error (bfd_error_bad_value);
1414 return FALSE;
1415
1416 case R_386_32:
1417 h->non_got_ref = 1;
1418 h->pointer_equality_needed = 1;
1419 if (info->shared)
1420 {
1421 /* We must copy these reloc types into the
1422 output file. Create a reloc section in
1423 dynobj and make room for this reloc. */
1424 sreloc = _bfd_elf_create_ifunc_dyn_reloc
1425 (abfd, info, sec, sreloc,
1426 &((struct elf_i386_link_hash_entry *) h)->dyn_relocs);
1427 if (sreloc == NULL)
1428 return FALSE;
1429 }
1430 break;
1431
1432 case R_386_PC32:
1433 h->non_got_ref = 1;
1434 break;
1435
1436 case R_386_PLT32:
1437 break;
1438
1439 case R_386_GOT32:
1440 case R_386_GOTOFF:
1441 h->got.refcount += 1;
1442 if (htab->elf.sgot == NULL
1443 && !_bfd_elf_create_got_section (htab->elf.dynobj,
1444 info))
1445 return FALSE;
1446 break;
1447 }
1448
1449 continue;
1450 }
1451 }
1452
1453 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1454 symtab_hdr, sym_hashes,
1455 &r_type, GOT_UNKNOWN,
1456 rel, rel_end, h, r_symndx))
1457 return FALSE;
1458
1459 switch (r_type)
1460 {
1461 case R_386_TLS_LDM:
1462 htab->tls_ldm_got.refcount += 1;
1463 goto create_got;
1464
1465 case R_386_PLT32:
1466 /* This symbol requires a procedure linkage table entry. We
1467 actually build the entry in adjust_dynamic_symbol,
1468 because this might be a case of linking PIC code which is
1469 never referenced by a dynamic object, in which case we
1470 don't need to generate a procedure linkage table entry
1471 after all. */
1472
1473 /* If this is a local symbol, we resolve it directly without
1474 creating a procedure linkage table entry. */
1475 if (h == NULL)
1476 continue;
1477
1478 h->needs_plt = 1;
1479 h->plt.refcount += 1;
1480 break;
1481
1482 case R_386_TLS_IE_32:
1483 case R_386_TLS_IE:
1484 case R_386_TLS_GOTIE:
1485 if (!info->executable)
1486 info->flags |= DF_STATIC_TLS;
1487 /* Fall through */
1488
1489 case R_386_GOT32:
1490 case R_386_TLS_GD:
1491 case R_386_TLS_GOTDESC:
1492 case R_386_TLS_DESC_CALL:
1493 /* This symbol requires a global offset table entry. */
1494 {
1495 int tls_type, old_tls_type;
1496
1497 switch (r_type)
1498 {
1499 default:
1500 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1501 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1502 case R_386_TLS_GOTDESC:
1503 case R_386_TLS_DESC_CALL:
1504 tls_type = GOT_TLS_GDESC; break;
1505 case R_386_TLS_IE_32:
1506 if (ELF32_R_TYPE (rel->r_info) == r_type)
1507 tls_type = GOT_TLS_IE_NEG;
1508 else
1509 /* If this is a GD->IE transition, we may use either of
1510 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1511 tls_type = GOT_TLS_IE;
1512 break;
1513 case R_386_TLS_IE:
1514 case R_386_TLS_GOTIE:
1515 tls_type = GOT_TLS_IE_POS; break;
1516 }
1517
1518 if (h != NULL)
1519 {
1520 h->got.refcount += 1;
1521 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1522 }
1523 else
1524 {
1525 bfd_signed_vma *local_got_refcounts;
1526
1527 /* This is a global offset table entry for a local symbol. */
1528 local_got_refcounts = elf_local_got_refcounts (abfd);
1529 if (local_got_refcounts == NULL)
1530 {
1531 bfd_size_type size;
1532
1533 size = symtab_hdr->sh_info;
1534 size *= (sizeof (bfd_signed_vma)
1535 + sizeof (bfd_vma) + sizeof(char));
1536 local_got_refcounts = (bfd_signed_vma *)
1537 bfd_zalloc (abfd, size);
1538 if (local_got_refcounts == NULL)
1539 return FALSE;
1540 elf_local_got_refcounts (abfd) = local_got_refcounts;
1541 elf_i386_local_tlsdesc_gotent (abfd)
1542 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1543 elf_i386_local_got_tls_type (abfd)
1544 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1545 }
1546 local_got_refcounts[r_symndx] += 1;
1547 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1548 }
1549
1550 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1551 tls_type |= old_tls_type;
1552 /* If a TLS symbol is accessed using IE at least once,
1553 there is no point to use dynamic model for it. */
1554 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1555 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1556 || (tls_type & GOT_TLS_IE) == 0))
1557 {
1558 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1559 tls_type = old_tls_type;
1560 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1561 && GOT_TLS_GD_ANY_P (tls_type))
1562 tls_type |= old_tls_type;
1563 else
1564 {
1565 if (h)
1566 name = h->root.root.string;
1567 else
1568 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1569 NULL);
1570 (*_bfd_error_handler)
1571 (_("%B: `%s' accessed both as normal and "
1572 "thread local symbol"),
1573 abfd, name);
1574 return FALSE;
1575 }
1576 }
1577
1578 if (old_tls_type != tls_type)
1579 {
1580 if (h != NULL)
1581 elf_i386_hash_entry (h)->tls_type = tls_type;
1582 else
1583 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1584 }
1585 }
1586 /* Fall through */
1587
1588 case R_386_GOTOFF:
1589 case R_386_GOTPC:
1590 create_got:
1591 if (htab->elf.sgot == NULL)
1592 {
1593 if (htab->elf.dynobj == NULL)
1594 htab->elf.dynobj = abfd;
1595 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1596 return FALSE;
1597 }
1598 if (r_type != R_386_TLS_IE)
1599 break;
1600 /* Fall through */
1601
1602 case R_386_TLS_LE_32:
1603 case R_386_TLS_LE:
1604 if (info->executable)
1605 break;
1606 info->flags |= DF_STATIC_TLS;
1607 /* Fall through */
1608
1609 case R_386_32:
1610 case R_386_PC32:
1611 if (h != NULL && info->executable)
1612 {
1613 /* If this reloc is in a read-only section, we might
1614 need a copy reloc. We can't check reliably at this
1615 stage whether the section is read-only, as input
1616 sections have not yet been mapped to output sections.
1617 Tentatively set the flag for now, and correct in
1618 adjust_dynamic_symbol. */
1619 h->non_got_ref = 1;
1620
1621 /* We may need a .plt entry if the function this reloc
1622 refers to is in a shared lib. */
1623 h->plt.refcount += 1;
1624 if (r_type != R_386_PC32)
1625 h->pointer_equality_needed = 1;
1626 }
1627
1628 /* If we are creating a shared library, and this is a reloc
1629 against a global symbol, or a non PC relative reloc
1630 against a local symbol, then we need to copy the reloc
1631 into the shared library. However, if we are linking with
1632 -Bsymbolic, we do not need to copy a reloc against a
1633 global symbol which is defined in an object we are
1634 including in the link (i.e., DEF_REGULAR is set). At
1635 this point we have not seen all the input files, so it is
1636 possible that DEF_REGULAR is not set now but will be set
1637 later (it is never cleared). In case of a weak definition,
1638 DEF_REGULAR may be cleared later by a strong definition in
1639 a shared library. We account for that possibility below by
1640 storing information in the relocs_copied field of the hash
1641 table entry. A similar situation occurs when creating
1642 shared libraries and symbol visibility changes render the
1643 symbol local.
1644
1645 If on the other hand, we are creating an executable, we
1646 may need to keep relocations for symbols satisfied by a
1647 dynamic library if we manage to avoid copy relocs for the
1648 symbol. */
1649 if ((info->shared
1650 && (sec->flags & SEC_ALLOC) != 0
1651 && (r_type != R_386_PC32
1652 || (h != NULL
1653 && (! SYMBOLIC_BIND (info, h)
1654 || h->root.type == bfd_link_hash_defweak
1655 || !h->def_regular))))
1656 || (ELIMINATE_COPY_RELOCS
1657 && !info->shared
1658 && (sec->flags & SEC_ALLOC) != 0
1659 && h != NULL
1660 && (h->root.type == bfd_link_hash_defweak
1661 || !h->def_regular)))
1662 {
1663 struct elf_dyn_relocs *p;
1664 struct elf_dyn_relocs **head;
1665
1666 /* We must copy these reloc types into the output file.
1667 Create a reloc section in dynobj and make room for
1668 this reloc. */
1669 if (sreloc == NULL)
1670 {
1671 if (htab->elf.dynobj == NULL)
1672 htab->elf.dynobj = abfd;
1673
1674 sreloc = _bfd_elf_make_dynamic_reloc_section
1675 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1676
1677 if (sreloc == NULL)
1678 return FALSE;
1679 }
1680
1681 /* If this is a global symbol, we count the number of
1682 relocations we need for this symbol. */
1683 if (h != NULL)
1684 {
1685 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1686 }
1687 else
1688 {
1689 /* Track dynamic relocs needed for local syms too.
1690 We really need local syms available to do this
1691 easily. Oh well. */
1692 void **vpp;
1693 asection *s;
1694
1695 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1696 abfd, r_symndx);
1697 if (isym == NULL)
1698 return FALSE;
1699
1700 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1701 if (s == NULL)
1702 s = sec;
1703
1704 vpp = &elf_section_data (s)->local_dynrel;
1705 head = (struct elf_dyn_relocs **)vpp;
1706 }
1707
1708 p = *head;
1709 if (p == NULL || p->sec != sec)
1710 {
1711 bfd_size_type amt = sizeof *p;
1712 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1713 amt);
1714 if (p == NULL)
1715 return FALSE;
1716 p->next = *head;
1717 *head = p;
1718 p->sec = sec;
1719 p->count = 0;
1720 p->pc_count = 0;
1721 }
1722
1723 p->count += 1;
1724 if (r_type == R_386_PC32)
1725 p->pc_count += 1;
1726 }
1727 break;
1728
1729 /* This relocation describes the C++ object vtable hierarchy.
1730 Reconstruct it for later use during GC. */
1731 case R_386_GNU_VTINHERIT:
1732 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1733 return FALSE;
1734 break;
1735
1736 /* This relocation describes which C++ vtable entries are actually
1737 used. Record for later use during GC. */
1738 case R_386_GNU_VTENTRY:
1739 BFD_ASSERT (h != NULL);
1740 if (h != NULL
1741 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1742 return FALSE;
1743 break;
1744
1745 default:
1746 break;
1747 }
1748 }
1749
1750 return TRUE;
1751 }
1752
1753 /* Return the section that should be marked against GC for a given
1754 relocation. */
1755
1756 static asection *
1757 elf_i386_gc_mark_hook (asection *sec,
1758 struct bfd_link_info *info,
1759 Elf_Internal_Rela *rel,
1760 struct elf_link_hash_entry *h,
1761 Elf_Internal_Sym *sym)
1762 {
1763 if (h != NULL)
1764 switch (ELF32_R_TYPE (rel->r_info))
1765 {
1766 case R_386_GNU_VTINHERIT:
1767 case R_386_GNU_VTENTRY:
1768 return NULL;
1769 }
1770
1771 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1772 }
1773
1774 /* Update the got entry reference counts for the section being removed. */
1775
1776 static bfd_boolean
1777 elf_i386_gc_sweep_hook (bfd *abfd,
1778 struct bfd_link_info *info,
1779 asection *sec,
1780 const Elf_Internal_Rela *relocs)
1781 {
1782 struct elf_i386_link_hash_table *htab;
1783 Elf_Internal_Shdr *symtab_hdr;
1784 struct elf_link_hash_entry **sym_hashes;
1785 bfd_signed_vma *local_got_refcounts;
1786 const Elf_Internal_Rela *rel, *relend;
1787
1788 if (info->relocatable)
1789 return TRUE;
1790
1791 htab = elf_i386_hash_table (info);
1792 if (htab == NULL)
1793 return FALSE;
1794
1795 elf_section_data (sec)->local_dynrel = NULL;
1796
1797 symtab_hdr = &elf_symtab_hdr (abfd);
1798 sym_hashes = elf_sym_hashes (abfd);
1799 local_got_refcounts = elf_local_got_refcounts (abfd);
1800
1801 relend = relocs + sec->reloc_count;
1802 for (rel = relocs; rel < relend; rel++)
1803 {
1804 unsigned long r_symndx;
1805 unsigned int r_type;
1806 struct elf_link_hash_entry *h = NULL;
1807
1808 r_symndx = ELF32_R_SYM (rel->r_info);
1809 if (r_symndx >= symtab_hdr->sh_info)
1810 {
1811 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1812 while (h->root.type == bfd_link_hash_indirect
1813 || h->root.type == bfd_link_hash_warning)
1814 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1815 }
1816 else
1817 {
1818 /* A local symbol. */
1819 Elf_Internal_Sym *isym;
1820
1821 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1822 abfd, r_symndx);
1823
1824 /* Check relocation against local STT_GNU_IFUNC symbol. */
1825 if (isym != NULL
1826 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1827 {
1828 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1829 if (h == NULL)
1830 abort ();
1831 }
1832 }
1833
1834 if (h)
1835 {
1836 struct elf_i386_link_hash_entry *eh;
1837 struct elf_dyn_relocs **pp;
1838 struct elf_dyn_relocs *p;
1839
1840 eh = (struct elf_i386_link_hash_entry *) h;
1841 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1842 if (p->sec == sec)
1843 {
1844 /* Everything must go for SEC. */
1845 *pp = p->next;
1846 break;
1847 }
1848 }
1849
1850 r_type = ELF32_R_TYPE (rel->r_info);
1851 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1852 symtab_hdr, sym_hashes,
1853 &r_type, GOT_UNKNOWN,
1854 rel, relend, h, r_symndx))
1855 return FALSE;
1856
1857 switch (r_type)
1858 {
1859 case R_386_TLS_LDM:
1860 if (htab->tls_ldm_got.refcount > 0)
1861 htab->tls_ldm_got.refcount -= 1;
1862 break;
1863
1864 case R_386_TLS_GD:
1865 case R_386_TLS_GOTDESC:
1866 case R_386_TLS_DESC_CALL:
1867 case R_386_TLS_IE_32:
1868 case R_386_TLS_IE:
1869 case R_386_TLS_GOTIE:
1870 case R_386_GOT32:
1871 if (h != NULL)
1872 {
1873 if (h->got.refcount > 0)
1874 h->got.refcount -= 1;
1875 if (h->type == STT_GNU_IFUNC)
1876 {
1877 if (h->plt.refcount > 0)
1878 h->plt.refcount -= 1;
1879 }
1880 }
1881 else if (local_got_refcounts != NULL)
1882 {
1883 if (local_got_refcounts[r_symndx] > 0)
1884 local_got_refcounts[r_symndx] -= 1;
1885 }
1886 break;
1887
1888 case R_386_32:
1889 case R_386_PC32:
1890 if (info->shared
1891 && (h == NULL || h->type != STT_GNU_IFUNC))
1892 break;
1893 /* Fall through */
1894
1895 case R_386_PLT32:
1896 if (h != NULL)
1897 {
1898 if (h->plt.refcount > 0)
1899 h->plt.refcount -= 1;
1900 }
1901 break;
1902
1903 case R_386_GOTOFF:
1904 if (h != NULL && h->type == STT_GNU_IFUNC)
1905 {
1906 if (h->got.refcount > 0)
1907 h->got.refcount -= 1;
1908 if (h->plt.refcount > 0)
1909 h->plt.refcount -= 1;
1910 }
1911 break;
1912
1913 default:
1914 break;
1915 }
1916 }
1917
1918 return TRUE;
1919 }
1920
1921 /* Adjust a symbol defined by a dynamic object and referenced by a
1922 regular object. The current definition is in some section of the
1923 dynamic object, but we're not including those sections. We have to
1924 change the definition to something the rest of the link can
1925 understand. */
1926
1927 static bfd_boolean
1928 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1929 struct elf_link_hash_entry *h)
1930 {
1931 struct elf_i386_link_hash_table *htab;
1932 asection *s;
1933
1934 /* STT_GNU_IFUNC symbol must go through PLT. */
1935 if (h->type == STT_GNU_IFUNC)
1936 {
1937 if (h->plt.refcount <= 0)
1938 {
1939 h->plt.offset = (bfd_vma) -1;
1940 h->needs_plt = 0;
1941 }
1942 return TRUE;
1943 }
1944
1945 /* If this is a function, put it in the procedure linkage table. We
1946 will fill in the contents of the procedure linkage table later,
1947 when we know the address of the .got section. */
1948 if (h->type == STT_FUNC
1949 || h->needs_plt)
1950 {
1951 if (h->plt.refcount <= 0
1952 || SYMBOL_CALLS_LOCAL (info, h)
1953 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1954 && h->root.type == bfd_link_hash_undefweak))
1955 {
1956 /* This case can occur if we saw a PLT32 reloc in an input
1957 file, but the symbol was never referred to by a dynamic
1958 object, or if all references were garbage collected. In
1959 such a case, we don't actually need to build a procedure
1960 linkage table, and we can just do a PC32 reloc instead. */
1961 h->plt.offset = (bfd_vma) -1;
1962 h->needs_plt = 0;
1963 }
1964
1965 return TRUE;
1966 }
1967 else
1968 /* It's possible that we incorrectly decided a .plt reloc was
1969 needed for an R_386_PC32 reloc to a non-function sym in
1970 check_relocs. We can't decide accurately between function and
1971 non-function syms in check-relocs; Objects loaded later in
1972 the link may change h->type. So fix it now. */
1973 h->plt.offset = (bfd_vma) -1;
1974
1975 /* If this is a weak symbol, and there is a real definition, the
1976 processor independent code will have arranged for us to see the
1977 real definition first, and we can just use the same value. */
1978 if (h->u.weakdef != NULL)
1979 {
1980 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1981 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1982 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1983 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1984 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1985 h->non_got_ref = h->u.weakdef->non_got_ref;
1986 return TRUE;
1987 }
1988
1989 /* This is a reference to a symbol defined by a dynamic object which
1990 is not a function. */
1991
1992 /* If we are creating a shared library, we must presume that the
1993 only references to the symbol are via the global offset table.
1994 For such cases we need not do anything here; the relocations will
1995 be handled correctly by relocate_section. */
1996 if (info->shared)
1997 return TRUE;
1998
1999 /* If there are no references to this symbol that do not use the
2000 GOT, we don't need to generate a copy reloc. */
2001 if (!h->non_got_ref)
2002 return TRUE;
2003
2004 /* If -z nocopyreloc was given, we won't generate them either. */
2005 if (info->nocopyreloc)
2006 {
2007 h->non_got_ref = 0;
2008 return TRUE;
2009 }
2010
2011 htab = elf_i386_hash_table (info);
2012 if (htab == NULL)
2013 return FALSE;
2014
2015 /* If there aren't any dynamic relocs in read-only sections, then
2016 we can keep the dynamic relocs and avoid the copy reloc. This
2017 doesn't work on VxWorks, where we can not have dynamic relocations
2018 (other than copy and jump slot relocations) in an executable. */
2019 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
2020 {
2021 struct elf_i386_link_hash_entry * eh;
2022 struct elf_dyn_relocs *p;
2023
2024 eh = (struct elf_i386_link_hash_entry *) h;
2025 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2026 {
2027 s = p->sec->output_section;
2028 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2029 break;
2030 }
2031
2032 if (p == NULL)
2033 {
2034 h->non_got_ref = 0;
2035 return TRUE;
2036 }
2037 }
2038
2039 if (h->size == 0)
2040 {
2041 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
2042 h->root.root.string);
2043 return TRUE;
2044 }
2045
2046 /* We must allocate the symbol in our .dynbss section, which will
2047 become part of the .bss section of the executable. There will be
2048 an entry for this symbol in the .dynsym section. The dynamic
2049 object will contain position independent code, so all references
2050 from the dynamic object to this symbol will go through the global
2051 offset table. The dynamic linker will use the .dynsym entry to
2052 determine the address it must put in the global offset table, so
2053 both the dynamic object and the regular object will refer to the
2054 same memory location for the variable. */
2055
2056 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2057 copy the initial value out of the dynamic object and into the
2058 runtime process image. */
2059 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
2060 {
2061 htab->srelbss->size += sizeof (Elf32_External_Rel);
2062 h->needs_copy = 1;
2063 }
2064
2065 s = htab->sdynbss;
2066
2067 return _bfd_elf_adjust_dynamic_copy (h, s);
2068 }
2069
2070 /* Allocate space in .plt, .got and associated reloc sections for
2071 dynamic relocs. */
2072
2073 static bfd_boolean
2074 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2075 {
2076 struct bfd_link_info *info;
2077 struct elf_i386_link_hash_table *htab;
2078 struct elf_i386_link_hash_entry *eh;
2079 struct elf_dyn_relocs *p;
2080
2081 if (h->root.type == bfd_link_hash_indirect)
2082 return TRUE;
2083
2084 if (h->root.type == bfd_link_hash_warning)
2085 /* When warning symbols are created, they **replace** the "real"
2086 entry in the hash table, thus we never get to see the real
2087 symbol in a hash traversal. So look at it now. */
2088 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2089 eh = (struct elf_i386_link_hash_entry *) h;
2090
2091 info = (struct bfd_link_info *) inf;
2092 htab = elf_i386_hash_table (info);
2093 if (htab == NULL)
2094 return FALSE;
2095
2096 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2097 here if it is defined and referenced in a non-shared object. */
2098 if (h->type == STT_GNU_IFUNC
2099 && h->def_regular)
2100 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h,
2101 &eh->dyn_relocs,
2102 PLT_ENTRY_SIZE, 4);
2103 else if (htab->elf.dynamic_sections_created
2104 && h->plt.refcount > 0)
2105 {
2106 /* Make sure this symbol is output as a dynamic symbol.
2107 Undefined weak syms won't yet be marked as dynamic. */
2108 if (h->dynindx == -1
2109 && !h->forced_local)
2110 {
2111 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2112 return FALSE;
2113 }
2114
2115 if (info->shared
2116 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2117 {
2118 asection *s = htab->elf.splt;
2119
2120 /* If this is the first .plt entry, make room for the special
2121 first entry. */
2122 if (s->size == 0)
2123 s->size += PLT_ENTRY_SIZE;
2124
2125 h->plt.offset = s->size;
2126
2127 /* If this symbol is not defined in a regular file, and we are
2128 not generating a shared library, then set the symbol to this
2129 location in the .plt. This is required to make function
2130 pointers compare as equal between the normal executable and
2131 the shared library. */
2132 if (! info->shared
2133 && !h->def_regular)
2134 {
2135 h->root.u.def.section = s;
2136 h->root.u.def.value = h->plt.offset;
2137 }
2138
2139 /* Make room for this entry. */
2140 s->size += PLT_ENTRY_SIZE;
2141
2142 /* We also need to make an entry in the .got.plt section, which
2143 will be placed in the .got section by the linker script. */
2144 htab->elf.sgotplt->size += 4;
2145
2146 /* We also need to make an entry in the .rel.plt section. */
2147 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2148 htab->next_tls_desc_index++;
2149
2150 if (htab->is_vxworks && !info->shared)
2151 {
2152 /* VxWorks has a second set of relocations for each PLT entry
2153 in executables. They go in a separate relocation section,
2154 which is processed by the kernel loader. */
2155
2156 /* There are two relocations for the initial PLT entry: an
2157 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2158 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2159
2160 if (h->plt.offset == PLT_ENTRY_SIZE)
2161 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2162
2163 /* There are two extra relocations for each subsequent PLT entry:
2164 an R_386_32 relocation for the GOT entry, and an R_386_32
2165 relocation for the PLT entry. */
2166
2167 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2168 }
2169 }
2170 else
2171 {
2172 h->plt.offset = (bfd_vma) -1;
2173 h->needs_plt = 0;
2174 }
2175 }
2176 else
2177 {
2178 h->plt.offset = (bfd_vma) -1;
2179 h->needs_plt = 0;
2180 }
2181
2182 eh->tlsdesc_got = (bfd_vma) -1;
2183
2184 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2185 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2186 if (h->got.refcount > 0
2187 && info->executable
2188 && h->dynindx == -1
2189 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2190 h->got.offset = (bfd_vma) -1;
2191 else if (h->got.refcount > 0)
2192 {
2193 asection *s;
2194 bfd_boolean dyn;
2195 int tls_type = elf_i386_hash_entry(h)->tls_type;
2196
2197 /* Make sure this symbol is output as a dynamic symbol.
2198 Undefined weak syms won't yet be marked as dynamic. */
2199 if (h->dynindx == -1
2200 && !h->forced_local)
2201 {
2202 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2203 return FALSE;
2204 }
2205
2206 s = htab->elf.sgot;
2207 if (GOT_TLS_GDESC_P (tls_type))
2208 {
2209 eh->tlsdesc_got = htab->elf.sgotplt->size
2210 - elf_i386_compute_jump_table_size (htab);
2211 htab->elf.sgotplt->size += 8;
2212 h->got.offset = (bfd_vma) -2;
2213 }
2214 if (! GOT_TLS_GDESC_P (tls_type)
2215 || GOT_TLS_GD_P (tls_type))
2216 {
2217 h->got.offset = s->size;
2218 s->size += 4;
2219 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2220 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2221 s->size += 4;
2222 }
2223 dyn = htab->elf.dynamic_sections_created;
2224 /* R_386_TLS_IE_32 needs one dynamic relocation,
2225 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2226 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2227 need two), R_386_TLS_GD needs one if local symbol and two if
2228 global. */
2229 if (tls_type == GOT_TLS_IE_BOTH)
2230 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2231 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2232 || (tls_type & GOT_TLS_IE))
2233 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2234 else if (GOT_TLS_GD_P (tls_type))
2235 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2236 else if (! GOT_TLS_GDESC_P (tls_type)
2237 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2238 || h->root.type != bfd_link_hash_undefweak)
2239 && (info->shared
2240 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2241 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2242 if (GOT_TLS_GDESC_P (tls_type))
2243 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2244 }
2245 else
2246 h->got.offset = (bfd_vma) -1;
2247
2248 if (eh->dyn_relocs == NULL)
2249 return TRUE;
2250
2251 /* In the shared -Bsymbolic case, discard space allocated for
2252 dynamic pc-relative relocs against symbols which turn out to be
2253 defined in regular objects. For the normal shared case, discard
2254 space for pc-relative relocs that have become local due to symbol
2255 visibility changes. */
2256
2257 if (info->shared)
2258 {
2259 /* The only reloc that uses pc_count is R_386_PC32, which will
2260 appear on a call or on something like ".long foo - .". We
2261 want calls to protected symbols to resolve directly to the
2262 function rather than going via the plt. If people want
2263 function pointer comparisons to work as expected then they
2264 should avoid writing assembly like ".long foo - .". */
2265 if (SYMBOL_CALLS_LOCAL (info, h))
2266 {
2267 struct elf_dyn_relocs **pp;
2268
2269 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2270 {
2271 p->count -= p->pc_count;
2272 p->pc_count = 0;
2273 if (p->count == 0)
2274 *pp = p->next;
2275 else
2276 pp = &p->next;
2277 }
2278 }
2279
2280 if (htab->is_vxworks)
2281 {
2282 struct elf_dyn_relocs **pp;
2283 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2284 {
2285 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2286 *pp = p->next;
2287 else
2288 pp = &p->next;
2289 }
2290 }
2291
2292 /* Also discard relocs on undefined weak syms with non-default
2293 visibility. */
2294 if (eh->dyn_relocs != NULL
2295 && h->root.type == bfd_link_hash_undefweak)
2296 {
2297 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2298 eh->dyn_relocs = NULL;
2299
2300 /* Make sure undefined weak symbols are output as a dynamic
2301 symbol in PIEs. */
2302 else if (h->dynindx == -1
2303 && !h->forced_local)
2304 {
2305 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2306 return FALSE;
2307 }
2308 }
2309 }
2310 else if (ELIMINATE_COPY_RELOCS)
2311 {
2312 /* For the non-shared case, discard space for relocs against
2313 symbols which turn out to need copy relocs or are not
2314 dynamic. */
2315
2316 if (!h->non_got_ref
2317 && ((h->def_dynamic
2318 && !h->def_regular)
2319 || (htab->elf.dynamic_sections_created
2320 && (h->root.type == bfd_link_hash_undefweak
2321 || h->root.type == bfd_link_hash_undefined))))
2322 {
2323 /* Make sure this symbol is output as a dynamic symbol.
2324 Undefined weak syms won't yet be marked as dynamic. */
2325 if (h->dynindx == -1
2326 && !h->forced_local)
2327 {
2328 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2329 return FALSE;
2330 }
2331
2332 /* If that succeeded, we know we'll be keeping all the
2333 relocs. */
2334 if (h->dynindx != -1)
2335 goto keep;
2336 }
2337
2338 eh->dyn_relocs = NULL;
2339
2340 keep: ;
2341 }
2342
2343 /* Finally, allocate space. */
2344 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2345 {
2346 asection *sreloc;
2347
2348 sreloc = elf_section_data (p->sec)->sreloc;
2349
2350 BFD_ASSERT (sreloc != NULL);
2351 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2352 }
2353
2354 return TRUE;
2355 }
2356
2357 /* Allocate space in .plt, .got and associated reloc sections for
2358 local dynamic relocs. */
2359
2360 static bfd_boolean
2361 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2362 {
2363 struct elf_link_hash_entry *h
2364 = (struct elf_link_hash_entry *) *slot;
2365
2366 if (h->type != STT_GNU_IFUNC
2367 || !h->def_regular
2368 || !h->ref_regular
2369 || !h->forced_local
2370 || h->root.type != bfd_link_hash_defined)
2371 abort ();
2372
2373 return elf_i386_allocate_dynrelocs (h, inf);
2374 }
2375
2376 /* Find any dynamic relocs that apply to read-only sections. */
2377
2378 static bfd_boolean
2379 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2380 {
2381 struct elf_i386_link_hash_entry *eh;
2382 struct elf_dyn_relocs *p;
2383
2384 if (h->root.type == bfd_link_hash_warning)
2385 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2386
2387 /* Skip local IFUNC symbols. */
2388 if (h->forced_local && h->type == STT_GNU_IFUNC)
2389 return TRUE;
2390
2391 eh = (struct elf_i386_link_hash_entry *) h;
2392 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2393 {
2394 asection *s = p->sec->output_section;
2395
2396 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2397 {
2398 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2399
2400 info->flags |= DF_TEXTREL;
2401
2402 /* Not an error, just cut short the traversal. */
2403 return FALSE;
2404 }
2405 }
2406 return TRUE;
2407 }
2408
2409 /* Set the sizes of the dynamic sections. */
2410
2411 static bfd_boolean
2412 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
2413 struct bfd_link_info *info)
2414 {
2415 struct elf_i386_link_hash_table *htab;
2416 bfd *dynobj;
2417 asection *s;
2418 bfd_boolean relocs;
2419 bfd *ibfd;
2420
2421 htab = elf_i386_hash_table (info);
2422 if (htab == NULL)
2423 return FALSE;
2424 dynobj = htab->elf.dynobj;
2425 if (dynobj == NULL)
2426 abort ();
2427
2428 if (htab->elf.dynamic_sections_created)
2429 {
2430 /* Set the contents of the .interp section to the interpreter. */
2431 if (info->executable)
2432 {
2433 s = bfd_get_section_by_name (dynobj, ".interp");
2434 if (s == NULL)
2435 abort ();
2436 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2437 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2438 }
2439 }
2440
2441 /* Set up .got offsets for local syms, and space for local dynamic
2442 relocs. */
2443 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2444 {
2445 bfd_signed_vma *local_got;
2446 bfd_signed_vma *end_local_got;
2447 char *local_tls_type;
2448 bfd_vma *local_tlsdesc_gotent;
2449 bfd_size_type locsymcount;
2450 Elf_Internal_Shdr *symtab_hdr;
2451 asection *srel;
2452
2453 if (! is_i386_elf (ibfd))
2454 continue;
2455
2456 for (s = ibfd->sections; s != NULL; s = s->next)
2457 {
2458 struct elf_dyn_relocs *p;
2459
2460 for (p = ((struct elf_dyn_relocs *)
2461 elf_section_data (s)->local_dynrel);
2462 p != NULL;
2463 p = p->next)
2464 {
2465 if (!bfd_is_abs_section (p->sec)
2466 && bfd_is_abs_section (p->sec->output_section))
2467 {
2468 /* Input section has been discarded, either because
2469 it is a copy of a linkonce section or due to
2470 linker script /DISCARD/, so we'll be discarding
2471 the relocs too. */
2472 }
2473 else if (htab->is_vxworks
2474 && strcmp (p->sec->output_section->name,
2475 ".tls_vars") == 0)
2476 {
2477 /* Relocations in vxworks .tls_vars sections are
2478 handled specially by the loader. */
2479 }
2480 else if (p->count != 0)
2481 {
2482 srel = elf_section_data (p->sec)->sreloc;
2483 srel->size += p->count * sizeof (Elf32_External_Rel);
2484 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
2485 info->flags |= DF_TEXTREL;
2486 }
2487 }
2488 }
2489
2490 local_got = elf_local_got_refcounts (ibfd);
2491 if (!local_got)
2492 continue;
2493
2494 symtab_hdr = &elf_symtab_hdr (ibfd);
2495 locsymcount = symtab_hdr->sh_info;
2496 end_local_got = local_got + locsymcount;
2497 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2498 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2499 s = htab->elf.sgot;
2500 srel = htab->elf.srelgot;
2501 for (; local_got < end_local_got;
2502 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2503 {
2504 *local_tlsdesc_gotent = (bfd_vma) -1;
2505 if (*local_got > 0)
2506 {
2507 if (GOT_TLS_GDESC_P (*local_tls_type))
2508 {
2509 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2510 - elf_i386_compute_jump_table_size (htab);
2511 htab->elf.sgotplt->size += 8;
2512 *local_got = (bfd_vma) -2;
2513 }
2514 if (! GOT_TLS_GDESC_P (*local_tls_type)
2515 || GOT_TLS_GD_P (*local_tls_type))
2516 {
2517 *local_got = s->size;
2518 s->size += 4;
2519 if (GOT_TLS_GD_P (*local_tls_type)
2520 || *local_tls_type == GOT_TLS_IE_BOTH)
2521 s->size += 4;
2522 }
2523 if (info->shared
2524 || GOT_TLS_GD_ANY_P (*local_tls_type)
2525 || (*local_tls_type & GOT_TLS_IE))
2526 {
2527 if (*local_tls_type == GOT_TLS_IE_BOTH)
2528 srel->size += 2 * sizeof (Elf32_External_Rel);
2529 else if (GOT_TLS_GD_P (*local_tls_type)
2530 || ! GOT_TLS_GDESC_P (*local_tls_type))
2531 srel->size += sizeof (Elf32_External_Rel);
2532 if (GOT_TLS_GDESC_P (*local_tls_type))
2533 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2534 }
2535 }
2536 else
2537 *local_got = (bfd_vma) -1;
2538 }
2539 }
2540
2541 if (htab->tls_ldm_got.refcount > 0)
2542 {
2543 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2544 relocs. */
2545 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2546 htab->elf.sgot->size += 8;
2547 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2548 }
2549 else
2550 htab->tls_ldm_got.offset = -1;
2551
2552 /* Allocate global sym .plt and .got entries, and space for global
2553 sym dynamic relocs. */
2554 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2555
2556 /* Allocate .plt and .got entries, and space for local symbols. */
2557 htab_traverse (htab->loc_hash_table,
2558 elf_i386_allocate_local_dynrelocs,
2559 info);
2560
2561 /* For every jump slot reserved in the sgotplt, reloc_count is
2562 incremented. However, when we reserve space for TLS descriptors,
2563 it's not incremented, so in order to compute the space reserved
2564 for them, it suffices to multiply the reloc count by the jump
2565 slot size. */
2566 if (htab->elf.srelplt)
2567 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2568
2569 if (htab->elf.sgotplt)
2570 {
2571 struct elf_link_hash_entry *got;
2572 got = elf_link_hash_lookup (elf_hash_table (info),
2573 "_GLOBAL_OFFSET_TABLE_",
2574 FALSE, FALSE, FALSE);
2575
2576 /* Don't allocate .got.plt section if there are no GOT nor PLT
2577 entries and there is no refeence to _GLOBAL_OFFSET_TABLE_. */
2578 if ((got == NULL
2579 || !got->ref_regular_nonweak)
2580 && (htab->elf.sgotplt->size
2581 == get_elf_backend_data (output_bfd)->got_header_size)
2582 && (htab->elf.splt == NULL
2583 || htab->elf.splt->size == 0)
2584 && (htab->elf.sgot == NULL
2585 || htab->elf.sgot->size == 0)
2586 && (htab->elf.iplt == NULL
2587 || htab->elf.iplt->size == 0)
2588 && (htab->elf.igotplt == NULL
2589 || htab->elf.igotplt->size == 0))
2590 htab->elf.sgotplt->size = 0;
2591 }
2592
2593 /* We now have determined the sizes of the various dynamic sections.
2594 Allocate memory for them. */
2595 relocs = FALSE;
2596 for (s = dynobj->sections; s != NULL; s = s->next)
2597 {
2598 bfd_boolean strip_section = TRUE;
2599
2600 if ((s->flags & SEC_LINKER_CREATED) == 0)
2601 continue;
2602
2603 if (s == htab->elf.splt
2604 || s == htab->elf.sgot
2605 || s == htab->elf.sgotplt
2606 || s == htab->elf.iplt
2607 || s == htab->elf.igotplt
2608 || s == htab->sdynbss)
2609 {
2610 /* Strip this section if we don't need it; see the
2611 comment below. */
2612 /* We'd like to strip these sections if they aren't needed, but if
2613 we've exported dynamic symbols from them we must leave them.
2614 It's too late to tell BFD to get rid of the symbols. */
2615
2616 if (htab->elf.hplt != NULL)
2617 strip_section = FALSE;
2618 }
2619 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2620 {
2621 if (s->size != 0
2622 && s != htab->elf.srelplt
2623 && s != htab->srelplt2)
2624 relocs = TRUE;
2625
2626 /* We use the reloc_count field as a counter if we need
2627 to copy relocs into the output file. */
2628 s->reloc_count = 0;
2629 }
2630 else
2631 {
2632 /* It's not one of our sections, so don't allocate space. */
2633 continue;
2634 }
2635
2636 if (s->size == 0)
2637 {
2638 /* If we don't need this section, strip it from the
2639 output file. This is mostly to handle .rel.bss and
2640 .rel.plt. We must create both sections in
2641 create_dynamic_sections, because they must be created
2642 before the linker maps input sections to output
2643 sections. The linker does that before
2644 adjust_dynamic_symbol is called, and it is that
2645 function which decides whether anything needs to go
2646 into these sections. */
2647 if (strip_section)
2648 s->flags |= SEC_EXCLUDE;
2649 continue;
2650 }
2651
2652 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2653 continue;
2654
2655 /* Allocate memory for the section contents. We use bfd_zalloc
2656 here in case unused entries are not reclaimed before the
2657 section's contents are written out. This should not happen,
2658 but this way if it does, we get a R_386_NONE reloc instead
2659 of garbage. */
2660 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2661 if (s->contents == NULL)
2662 return FALSE;
2663 }
2664
2665 if (htab->elf.dynamic_sections_created)
2666 {
2667 /* Add some entries to the .dynamic section. We fill in the
2668 values later, in elf_i386_finish_dynamic_sections, but we
2669 must add the entries now so that we get the correct size for
2670 the .dynamic section. The DT_DEBUG entry is filled in by the
2671 dynamic linker and used by the debugger. */
2672 #define add_dynamic_entry(TAG, VAL) \
2673 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2674
2675 if (info->executable)
2676 {
2677 if (!add_dynamic_entry (DT_DEBUG, 0))
2678 return FALSE;
2679 }
2680
2681 if (htab->elf.splt->size != 0)
2682 {
2683 if (!add_dynamic_entry (DT_PLTGOT, 0)
2684 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2685 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2686 || !add_dynamic_entry (DT_JMPREL, 0))
2687 return FALSE;
2688 }
2689
2690 if (relocs)
2691 {
2692 if (!add_dynamic_entry (DT_REL, 0)
2693 || !add_dynamic_entry (DT_RELSZ, 0)
2694 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2695 return FALSE;
2696
2697 /* If any dynamic relocs apply to a read-only section,
2698 then we need a DT_TEXTREL entry. */
2699 if ((info->flags & DF_TEXTREL) == 0)
2700 elf_link_hash_traverse (&htab->elf,
2701 elf_i386_readonly_dynrelocs, info);
2702
2703 if ((info->flags & DF_TEXTREL) != 0)
2704 {
2705 if (!add_dynamic_entry (DT_TEXTREL, 0))
2706 return FALSE;
2707 }
2708 }
2709 if (htab->is_vxworks
2710 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
2711 return FALSE;
2712 }
2713 #undef add_dynamic_entry
2714
2715 return TRUE;
2716 }
2717
2718 static bfd_boolean
2719 elf_i386_always_size_sections (bfd *output_bfd,
2720 struct bfd_link_info *info)
2721 {
2722 asection *tls_sec = elf_hash_table (info)->tls_sec;
2723
2724 if (tls_sec)
2725 {
2726 struct elf_link_hash_entry *tlsbase;
2727
2728 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2729 "_TLS_MODULE_BASE_",
2730 FALSE, FALSE, FALSE);
2731
2732 if (tlsbase && tlsbase->type == STT_TLS)
2733 {
2734 struct elf_i386_link_hash_table *htab;
2735 struct bfd_link_hash_entry *bh = NULL;
2736 const struct elf_backend_data *bed
2737 = get_elf_backend_data (output_bfd);
2738
2739 htab = elf_i386_hash_table (info);
2740 if (htab == NULL)
2741 return FALSE;
2742
2743 if (!(_bfd_generic_link_add_one_symbol
2744 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2745 tls_sec, 0, NULL, FALSE,
2746 bed->collect, &bh)))
2747 return FALSE;
2748
2749 htab->tls_module_base = bh;
2750
2751 tlsbase = (struct elf_link_hash_entry *)bh;
2752 tlsbase->def_regular = 1;
2753 tlsbase->other = STV_HIDDEN;
2754 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2755 }
2756 }
2757
2758 return TRUE;
2759 }
2760
2761 /* Set the correct type for an x86 ELF section. We do this by the
2762 section name, which is a hack, but ought to work. */
2763
2764 static bfd_boolean
2765 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2766 Elf_Internal_Shdr *hdr,
2767 asection *sec)
2768 {
2769 const char *name;
2770
2771 name = bfd_get_section_name (abfd, sec);
2772
2773 /* This is an ugly, but unfortunately necessary hack that is
2774 needed when producing EFI binaries on x86. It tells
2775 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2776 containing ELF relocation info. We need this hack in order to
2777 be able to generate ELF binaries that can be translated into
2778 EFI applications (which are essentially COFF objects). Those
2779 files contain a COFF ".reloc" section inside an ELFNN object,
2780 which would normally cause BFD to segfault because it would
2781 attempt to interpret this section as containing relocation
2782 entries for section "oc". With this hack enabled, ".reloc"
2783 will be treated as a normal data section, which will avoid the
2784 segfault. However, you won't be able to create an ELFNN binary
2785 with a section named "oc" that needs relocations, but that's
2786 the kind of ugly side-effects you get when detecting section
2787 types based on their names... In practice, this limitation is
2788 unlikely to bite. */
2789 if (strcmp (name, ".reloc") == 0)
2790 hdr->sh_type = SHT_PROGBITS;
2791
2792 return TRUE;
2793 }
2794
2795 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
2796 executables. Rather than setting it to the beginning of the TLS
2797 section, we have to set it to the end. This function may be called
2798 multiple times, it is idempotent. */
2799
2800 static void
2801 elf_i386_set_tls_module_base (struct bfd_link_info *info)
2802 {
2803 struct elf_i386_link_hash_table *htab;
2804 struct bfd_link_hash_entry *base;
2805
2806 if (!info->executable)
2807 return;
2808
2809 htab = elf_i386_hash_table (info);
2810 if (htab == NULL)
2811 return;
2812
2813 base = htab->tls_module_base;
2814 if (base == NULL)
2815 return;
2816
2817 base->u.def.value = htab->elf.tls_size;
2818 }
2819
2820 /* Return the base VMA address which should be subtracted from real addresses
2821 when resolving @dtpoff relocation.
2822 This is PT_TLS segment p_vaddr. */
2823
2824 static bfd_vma
2825 elf_i386_dtpoff_base (struct bfd_link_info *info)
2826 {
2827 /* If tls_sec is NULL, we should have signalled an error already. */
2828 if (elf_hash_table (info)->tls_sec == NULL)
2829 return 0;
2830 return elf_hash_table (info)->tls_sec->vma;
2831 }
2832
2833 /* Return the relocation value for @tpoff relocation
2834 if STT_TLS virtual address is ADDRESS. */
2835
2836 static bfd_vma
2837 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2838 {
2839 struct elf_link_hash_table *htab = elf_hash_table (info);
2840 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2841 bfd_vma static_tls_size;
2842
2843 /* If tls_sec is NULL, we should have signalled an error already. */
2844 if (htab->tls_sec == NULL)
2845 return 0;
2846
2847 /* Consider special static TLS alignment requirements. */
2848 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2849 return static_tls_size + htab->tls_sec->vma - address;
2850 }
2851
2852 /* Relocate an i386 ELF section. */
2853
2854 static bfd_boolean
2855 elf_i386_relocate_section (bfd *output_bfd,
2856 struct bfd_link_info *info,
2857 bfd *input_bfd,
2858 asection *input_section,
2859 bfd_byte *contents,
2860 Elf_Internal_Rela *relocs,
2861 Elf_Internal_Sym *local_syms,
2862 asection **local_sections)
2863 {
2864 struct elf_i386_link_hash_table *htab;
2865 Elf_Internal_Shdr *symtab_hdr;
2866 struct elf_link_hash_entry **sym_hashes;
2867 bfd_vma *local_got_offsets;
2868 bfd_vma *local_tlsdesc_gotents;
2869 Elf_Internal_Rela *rel;
2870 Elf_Internal_Rela *relend;
2871 bfd_boolean is_vxworks_tls;
2872
2873 BFD_ASSERT (is_i386_elf (input_bfd));
2874
2875 htab = elf_i386_hash_table (info);
2876 if (htab == NULL)
2877 return FALSE;
2878 symtab_hdr = &elf_symtab_hdr (input_bfd);
2879 sym_hashes = elf_sym_hashes (input_bfd);
2880 local_got_offsets = elf_local_got_offsets (input_bfd);
2881 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2882 /* We have to handle relocations in vxworks .tls_vars sections
2883 specially, because the dynamic loader is 'weird'. */
2884 is_vxworks_tls = (htab->is_vxworks && info->shared
2885 && !strcmp (input_section->output_section->name,
2886 ".tls_vars"));
2887
2888 elf_i386_set_tls_module_base (info);
2889
2890 rel = relocs;
2891 relend = relocs + input_section->reloc_count;
2892 for (; rel < relend; rel++)
2893 {
2894 unsigned int r_type;
2895 reloc_howto_type *howto;
2896 unsigned long r_symndx;
2897 struct elf_link_hash_entry *h;
2898 Elf_Internal_Sym *sym;
2899 asection *sec;
2900 bfd_vma off, offplt;
2901 bfd_vma relocation;
2902 bfd_boolean unresolved_reloc;
2903 bfd_reloc_status_type r;
2904 unsigned int indx;
2905 int tls_type;
2906
2907 r_type = ELF32_R_TYPE (rel->r_info);
2908 if (r_type == R_386_GNU_VTINHERIT
2909 || r_type == R_386_GNU_VTENTRY)
2910 continue;
2911
2912 if ((indx = r_type) >= R_386_standard
2913 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2914 >= R_386_ext - R_386_standard)
2915 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2916 >= R_386_irelative - R_386_ext))
2917 {
2918 (*_bfd_error_handler)
2919 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2920 input_bfd, input_section, r_type);
2921 bfd_set_error (bfd_error_bad_value);
2922 return FALSE;
2923 }
2924 howto = elf_howto_table + indx;
2925
2926 r_symndx = ELF32_R_SYM (rel->r_info);
2927 h = NULL;
2928 sym = NULL;
2929 sec = NULL;
2930 unresolved_reloc = FALSE;
2931 if (r_symndx < symtab_hdr->sh_info)
2932 {
2933 sym = local_syms + r_symndx;
2934 sec = local_sections[r_symndx];
2935 relocation = (sec->output_section->vma
2936 + sec->output_offset
2937 + sym->st_value);
2938
2939 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2940 && ((sec->flags & SEC_MERGE) != 0
2941 || (info->relocatable
2942 && sec->output_offset != 0)))
2943 {
2944 bfd_vma addend;
2945 bfd_byte *where = contents + rel->r_offset;
2946
2947 switch (howto->size)
2948 {
2949 case 0:
2950 addend = bfd_get_8 (input_bfd, where);
2951 if (howto->pc_relative)
2952 {
2953 addend = (addend ^ 0x80) - 0x80;
2954 addend += 1;
2955 }
2956 break;
2957 case 1:
2958 addend = bfd_get_16 (input_bfd, where);
2959 if (howto->pc_relative)
2960 {
2961 addend = (addend ^ 0x8000) - 0x8000;
2962 addend += 2;
2963 }
2964 break;
2965 case 2:
2966 addend = bfd_get_32 (input_bfd, where);
2967 if (howto->pc_relative)
2968 {
2969 addend = (addend ^ 0x80000000) - 0x80000000;
2970 addend += 4;
2971 }
2972 break;
2973 default:
2974 abort ();
2975 }
2976
2977 if (info->relocatable)
2978 addend += sec->output_offset;
2979 else
2980 {
2981 asection *msec = sec;
2982 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2983 addend);
2984 addend -= relocation;
2985 addend += msec->output_section->vma + msec->output_offset;
2986 }
2987
2988 switch (howto->size)
2989 {
2990 case 0:
2991 /* FIXME: overflow checks. */
2992 if (howto->pc_relative)
2993 addend -= 1;
2994 bfd_put_8 (input_bfd, addend, where);
2995 break;
2996 case 1:
2997 if (howto->pc_relative)
2998 addend -= 2;
2999 bfd_put_16 (input_bfd, addend, where);
3000 break;
3001 case 2:
3002 if (howto->pc_relative)
3003 addend -= 4;
3004 bfd_put_32 (input_bfd, addend, where);
3005 break;
3006 }
3007 }
3008 else if (!info->relocatable
3009 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3010 {
3011 /* Relocate against local STT_GNU_IFUNC symbol. */
3012 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3013 FALSE);
3014 if (h == NULL)
3015 abort ();
3016
3017 /* Set STT_GNU_IFUNC symbol value. */
3018 h->root.u.def.value = sym->st_value;
3019 h->root.u.def.section = sec;
3020 }
3021 }
3022 else
3023 {
3024 bfd_boolean warned ATTRIBUTE_UNUSED;
3025
3026 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3027 r_symndx, symtab_hdr, sym_hashes,
3028 h, sec, relocation,
3029 unresolved_reloc, warned);
3030 }
3031
3032 if (sec != NULL && elf_discarded_section (sec))
3033 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3034 rel, relend, howto, contents);
3035
3036 if (info->relocatable)
3037 continue;
3038
3039 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3040 it here if it is defined in a non-shared object. */
3041 if (h != NULL
3042 && h->type == STT_GNU_IFUNC
3043 && h->def_regular)
3044 {
3045 asection *plt, *gotplt, *base_got;
3046 bfd_vma plt_index;
3047 const char *name;
3048
3049 if ((input_section->flags & SEC_ALLOC) == 0
3050 || h->plt.offset == (bfd_vma) -1)
3051 abort ();
3052
3053 /* STT_GNU_IFUNC symbol must go through PLT. */
3054 if (htab->elf.splt != NULL)
3055 {
3056 plt = htab->elf.splt;
3057 gotplt = htab->elf.sgotplt;
3058 }
3059 else
3060 {
3061 plt = htab->elf.iplt;
3062 gotplt = htab->elf.igotplt;
3063 }
3064
3065 relocation = (plt->output_section->vma
3066 + plt->output_offset + h->plt.offset);
3067
3068 switch (r_type)
3069 {
3070 default:
3071 if (h->root.root.string)
3072 name = h->root.root.string;
3073 else
3074 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3075 NULL);
3076 (*_bfd_error_handler)
3077 (_("%B: relocation %s against STT_GNU_IFUNC "
3078 "symbol `%s' isn't handled by %s"), input_bfd,
3079 elf_howto_table[r_type].name,
3080 name, __FUNCTION__);
3081 bfd_set_error (bfd_error_bad_value);
3082 return FALSE;
3083
3084 case R_386_32:
3085 /* Generate dynamic relcoation only when there is a
3086 non-GOF reference in a shared object. */
3087 if (info->shared && h->non_got_ref)
3088 {
3089 Elf_Internal_Rela outrel;
3090 bfd_byte *loc;
3091 asection *sreloc;
3092 bfd_vma offset;
3093
3094 /* Need a dynamic relocation to get the real function
3095 adddress. */
3096 offset = _bfd_elf_section_offset (output_bfd,
3097 info,
3098 input_section,
3099 rel->r_offset);
3100 if (offset == (bfd_vma) -1
3101 || offset == (bfd_vma) -2)
3102 abort ();
3103
3104 outrel.r_offset = (input_section->output_section->vma
3105 + input_section->output_offset
3106 + offset);
3107
3108 if (h->dynindx == -1
3109 || h->forced_local
3110 || info->executable)
3111 {
3112 /* This symbol is resolved locally. */
3113 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3114 bfd_put_32 (output_bfd,
3115 (h->root.u.def.value
3116 + h->root.u.def.section->output_section->vma
3117 + h->root.u.def.section->output_offset),
3118 contents + offset);
3119 }
3120 else
3121 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3122
3123 sreloc = htab->elf.irelifunc;
3124 loc = sreloc->contents;
3125 loc += (sreloc->reloc_count++
3126 * sizeof (Elf32_External_Rel));
3127 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3128
3129 /* If this reloc is against an external symbol, we
3130 do not want to fiddle with the addend. Otherwise,
3131 we need to include the symbol value so that it
3132 becomes an addend for the dynamic reloc. For an
3133 internal symbol, we have updated addend. */
3134 continue;
3135 }
3136 /* FALLTHROUGH */
3137 case R_386_PC32:
3138 case R_386_PLT32:
3139 goto do_relocation;
3140
3141 case R_386_GOT32:
3142 base_got = htab->elf.sgot;
3143 off = h->got.offset;
3144
3145 if (base_got == NULL)
3146 abort ();
3147
3148 if (off == (bfd_vma) -1)
3149 {
3150 /* We can't use h->got.offset here to save state, or
3151 even just remember the offset, as finish_dynamic_symbol
3152 would use that as offset into .got. */
3153
3154 if (htab->elf.splt != NULL)
3155 {
3156 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3157 off = (plt_index + 3) * 4;
3158 base_got = htab->elf.sgotplt;
3159 }
3160 else
3161 {
3162 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
3163 off = plt_index * 4;
3164 base_got = htab->elf.igotplt;
3165 }
3166
3167 if (h->dynindx == -1
3168 || h->forced_local
3169 || info->symbolic)
3170 {
3171 /* This references the local defitionion. We must
3172 initialize this entry in the global offset table.
3173 Since the offset must always be a multiple of 8,
3174 we use the least significant bit to record
3175 whether we have initialized it already.
3176
3177 When doing a dynamic link, we create a .rela.got
3178 relocation entry to initialize the value. This
3179 is done in the finish_dynamic_symbol routine. */
3180 if ((off & 1) != 0)
3181 off &= ~1;
3182 else
3183 {
3184 bfd_put_32 (output_bfd, relocation,
3185 base_got->contents + off);
3186 h->got.offset |= 1;
3187 }
3188 }
3189
3190 relocation = off;
3191
3192 /* Adjust for static executables. */
3193 if (htab->elf.splt == NULL)
3194 relocation += gotplt->output_offset;
3195 }
3196 else
3197 {
3198 relocation = (base_got->output_section->vma
3199 + base_got->output_offset + off
3200 - gotplt->output_section->vma
3201 - gotplt->output_offset);
3202 /* Adjust for static executables. */
3203 if (htab->elf.splt == NULL)
3204 relocation += gotplt->output_offset;
3205 }
3206
3207 goto do_relocation;
3208
3209 case R_386_GOTOFF:
3210 relocation -= (gotplt->output_section->vma
3211 + gotplt->output_offset);
3212 goto do_relocation;
3213 }
3214 }
3215
3216 switch (r_type)
3217 {
3218 case R_386_GOT32:
3219 /* Relocation is to the entry for this symbol in the global
3220 offset table. */
3221 if (htab->elf.sgot == NULL)
3222 abort ();
3223
3224 if (h != NULL)
3225 {
3226 bfd_boolean dyn;
3227
3228 off = h->got.offset;
3229 dyn = htab->elf.dynamic_sections_created;
3230 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3231 || (info->shared
3232 && SYMBOL_REFERENCES_LOCAL (info, h))
3233 || (ELF_ST_VISIBILITY (h->other)
3234 && h->root.type == bfd_link_hash_undefweak))
3235 {
3236 /* This is actually a static link, or it is a
3237 -Bsymbolic link and the symbol is defined
3238 locally, or the symbol was forced to be local
3239 because of a version file. We must initialize
3240 this entry in the global offset table. Since the
3241 offset must always be a multiple of 4, we use the
3242 least significant bit to record whether we have
3243 initialized it already.
3244
3245 When doing a dynamic link, we create a .rel.got
3246 relocation entry to initialize the value. This
3247 is done in the finish_dynamic_symbol routine. */
3248 if ((off & 1) != 0)
3249 off &= ~1;
3250 else
3251 {
3252 bfd_put_32 (output_bfd, relocation,
3253 htab->elf.sgot->contents + off);
3254 h->got.offset |= 1;
3255 }
3256 }
3257 else
3258 unresolved_reloc = FALSE;
3259 }
3260 else
3261 {
3262 if (local_got_offsets == NULL)
3263 abort ();
3264
3265 off = local_got_offsets[r_symndx];
3266
3267 /* The offset must always be a multiple of 4. We use
3268 the least significant bit to record whether we have
3269 already generated the necessary reloc. */
3270 if ((off & 1) != 0)
3271 off &= ~1;
3272 else
3273 {
3274 bfd_put_32 (output_bfd, relocation,
3275 htab->elf.sgot->contents + off);
3276
3277 if (info->shared)
3278 {
3279 asection *s;
3280 Elf_Internal_Rela outrel;
3281 bfd_byte *loc;
3282
3283 s = htab->elf.srelgot;
3284 if (s == NULL)
3285 abort ();
3286
3287 outrel.r_offset = (htab->elf.sgot->output_section->vma
3288 + htab->elf.sgot->output_offset
3289 + off);
3290 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3291 loc = s->contents;
3292 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
3293 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3294 }
3295
3296 local_got_offsets[r_symndx] |= 1;
3297 }
3298 }
3299
3300 if (off >= (bfd_vma) -2)
3301 abort ();
3302
3303 relocation = htab->elf.sgot->output_section->vma
3304 + htab->elf.sgot->output_offset + off
3305 - htab->elf.sgotplt->output_section->vma
3306 - htab->elf.sgotplt->output_offset;
3307 break;
3308
3309 case R_386_GOTOFF:
3310 /* Relocation is relative to the start of the global offset
3311 table. */
3312
3313 /* Check to make sure it isn't a protected function symbol
3314 for shared library since it may not be local when used
3315 as function address. We also need to make sure that a
3316 symbol is defined locally. */
3317 if (info->shared && h)
3318 {
3319 if (!h->def_regular)
3320 {
3321 const char *v;
3322
3323 switch (ELF_ST_VISIBILITY (h->other))
3324 {
3325 case STV_HIDDEN:
3326 v = _("hidden symbol");
3327 break;
3328 case STV_INTERNAL:
3329 v = _("internal symbol");
3330 break;
3331 case STV_PROTECTED:
3332 v = _("protected symbol");
3333 break;
3334 default:
3335 v = _("symbol");
3336 break;
3337 }
3338
3339 (*_bfd_error_handler)
3340 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3341 input_bfd, v, h->root.root.string);
3342 bfd_set_error (bfd_error_bad_value);
3343 return FALSE;
3344 }
3345 else if (!info->executable
3346 && h->type == STT_FUNC
3347 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3348 {
3349 (*_bfd_error_handler)
3350 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3351 input_bfd, h->root.root.string);
3352 bfd_set_error (bfd_error_bad_value);
3353 return FALSE;
3354 }
3355 }
3356
3357 /* Note that sgot is not involved in this
3358 calculation. We always want the start of .got.plt. If we
3359 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3360 permitted by the ABI, we might have to change this
3361 calculation. */
3362 relocation -= htab->elf.sgotplt->output_section->vma
3363 + htab->elf.sgotplt->output_offset;
3364 break;
3365
3366 case R_386_GOTPC:
3367 /* Use global offset table as symbol value. */
3368 relocation = htab->elf.sgotplt->output_section->vma
3369 + htab->elf.sgotplt->output_offset;
3370 unresolved_reloc = FALSE;
3371 break;
3372
3373 case R_386_PLT32:
3374 /* Relocation is to the entry for this symbol in the
3375 procedure linkage table. */
3376
3377 /* Resolve a PLT32 reloc against a local symbol directly,
3378 without using the procedure linkage table. */
3379 if (h == NULL)
3380 break;
3381
3382 if (h->plt.offset == (bfd_vma) -1
3383 || htab->elf.splt == NULL)
3384 {
3385 /* We didn't make a PLT entry for this symbol. This
3386 happens when statically linking PIC code, or when
3387 using -Bsymbolic. */
3388 break;
3389 }
3390
3391 relocation = (htab->elf.splt->output_section->vma
3392 + htab->elf.splt->output_offset
3393 + h->plt.offset);
3394 unresolved_reloc = FALSE;
3395 break;
3396
3397 case R_386_32:
3398 case R_386_PC32:
3399 if ((input_section->flags & SEC_ALLOC) == 0
3400 || is_vxworks_tls)
3401 break;
3402
3403 if ((info->shared
3404 && (h == NULL
3405 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3406 || h->root.type != bfd_link_hash_undefweak)
3407 && (r_type != R_386_PC32
3408 || !SYMBOL_CALLS_LOCAL (info, h)))
3409 || (ELIMINATE_COPY_RELOCS
3410 && !info->shared
3411 && h != NULL
3412 && h->dynindx != -1
3413 && !h->non_got_ref
3414 && ((h->def_dynamic
3415 && !h->def_regular)
3416 || h->root.type == bfd_link_hash_undefweak
3417 || h->root.type == bfd_link_hash_undefined)))
3418 {
3419 Elf_Internal_Rela outrel;
3420 bfd_byte *loc;
3421 bfd_boolean skip, relocate;
3422 asection *sreloc;
3423
3424 /* When generating a shared object, these relocations
3425 are copied into the output file to be resolved at run
3426 time. */
3427
3428 skip = FALSE;
3429 relocate = FALSE;
3430
3431 outrel.r_offset =
3432 _bfd_elf_section_offset (output_bfd, info, input_section,
3433 rel->r_offset);
3434 if (outrel.r_offset == (bfd_vma) -1)
3435 skip = TRUE;
3436 else if (outrel.r_offset == (bfd_vma) -2)
3437 skip = TRUE, relocate = TRUE;
3438 outrel.r_offset += (input_section->output_section->vma
3439 + input_section->output_offset);
3440
3441 if (skip)
3442 memset (&outrel, 0, sizeof outrel);
3443 else if (h != NULL
3444 && h->dynindx != -1
3445 && (r_type == R_386_PC32
3446 || !info->shared
3447 || !SYMBOLIC_BIND (info, h)
3448 || !h->def_regular))
3449 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3450 else
3451 {
3452 /* This symbol is local, or marked to become local. */
3453 relocate = TRUE;
3454 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3455 }
3456
3457 sreloc = elf_section_data (input_section)->sreloc;
3458
3459 if (sreloc == NULL || sreloc->contents == NULL)
3460 {
3461 r = bfd_reloc_notsupported;
3462 goto check_relocation_error;
3463 }
3464
3465 loc = sreloc->contents;
3466 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3467
3468 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3469
3470 /* If this reloc is against an external symbol, we do
3471 not want to fiddle with the addend. Otherwise, we
3472 need to include the symbol value so that it becomes
3473 an addend for the dynamic reloc. */
3474 if (! relocate)
3475 continue;
3476 }
3477 break;
3478
3479 case R_386_TLS_IE:
3480 if (!info->executable)
3481 {
3482 Elf_Internal_Rela outrel;
3483 bfd_byte *loc;
3484 asection *sreloc;
3485
3486 outrel.r_offset = rel->r_offset
3487 + input_section->output_section->vma
3488 + input_section->output_offset;
3489 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3490 sreloc = elf_section_data (input_section)->sreloc;
3491 if (sreloc == NULL)
3492 abort ();
3493 loc = sreloc->contents;
3494 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3495 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3496 }
3497 /* Fall through */
3498
3499 case R_386_TLS_GD:
3500 case R_386_TLS_GOTDESC:
3501 case R_386_TLS_DESC_CALL:
3502 case R_386_TLS_IE_32:
3503 case R_386_TLS_GOTIE:
3504 tls_type = GOT_UNKNOWN;
3505 if (h == NULL && local_got_offsets)
3506 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3507 else if (h != NULL)
3508 tls_type = elf_i386_hash_entry(h)->tls_type;
3509 if (tls_type == GOT_TLS_IE)
3510 tls_type = GOT_TLS_IE_NEG;
3511
3512 if (! elf_i386_tls_transition (info, input_bfd,
3513 input_section, contents,
3514 symtab_hdr, sym_hashes,
3515 &r_type, tls_type, rel,
3516 relend, h, r_symndx))
3517 return FALSE;
3518
3519 if (r_type == R_386_TLS_LE_32)
3520 {
3521 BFD_ASSERT (! unresolved_reloc);
3522 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3523 {
3524 unsigned int type;
3525 bfd_vma roff;
3526
3527 /* GD->LE transition. */
3528 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3529 if (type == 0x04)
3530 {
3531 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3532 Change it into:
3533 movl %gs:0, %eax; subl $foo@tpoff, %eax
3534 (6 byte form of subl). */
3535 memcpy (contents + rel->r_offset - 3,
3536 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3537 roff = rel->r_offset + 5;
3538 }
3539 else
3540 {
3541 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3542 Change it into:
3543 movl %gs:0, %eax; subl $foo@tpoff, %eax
3544 (6 byte form of subl). */
3545 memcpy (contents + rel->r_offset - 2,
3546 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3547 roff = rel->r_offset + 6;
3548 }
3549 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3550 contents + roff);
3551 /* Skip R_386_PC32/R_386_PLT32. */
3552 rel++;
3553 continue;
3554 }
3555 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3556 {
3557 /* GDesc -> LE transition.
3558 It's originally something like:
3559 leal x@tlsdesc(%ebx), %eax
3560
3561 leal x@ntpoff, %eax
3562
3563 Registers other than %eax may be set up here. */
3564
3565 unsigned int val;
3566 bfd_vma roff;
3567
3568 roff = rel->r_offset;
3569 val = bfd_get_8 (input_bfd, contents + roff - 1);
3570
3571 /* Now modify the instruction as appropriate. */
3572 /* aoliva FIXME: remove the above and xor the byte
3573 below with 0x86. */
3574 bfd_put_8 (output_bfd, val ^ 0x86,
3575 contents + roff - 1);
3576 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3577 contents + roff);
3578 continue;
3579 }
3580 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3581 {
3582 /* GDesc -> LE transition.
3583 It's originally:
3584 call *(%eax)
3585 Turn it into:
3586 xchg %ax,%ax */
3587
3588 bfd_vma roff;
3589
3590 roff = rel->r_offset;
3591 bfd_put_8 (output_bfd, 0x66, contents + roff);
3592 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3593 continue;
3594 }
3595 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3596 {
3597 unsigned int val;
3598
3599 /* IE->LE transition:
3600 Originally it can be one of:
3601 movl foo, %eax
3602 movl foo, %reg
3603 addl foo, %reg
3604 We change it into:
3605 movl $foo, %eax
3606 movl $foo, %reg
3607 addl $foo, %reg. */
3608 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3609 if (val == 0xa1)
3610 {
3611 /* movl foo, %eax. */
3612 bfd_put_8 (output_bfd, 0xb8,
3613 contents + rel->r_offset - 1);
3614 }
3615 else
3616 {
3617 unsigned int type;
3618
3619 type = bfd_get_8 (input_bfd,
3620 contents + rel->r_offset - 2);
3621 switch (type)
3622 {
3623 case 0x8b:
3624 /* movl */
3625 bfd_put_8 (output_bfd, 0xc7,
3626 contents + rel->r_offset - 2);
3627 bfd_put_8 (output_bfd,
3628 0xc0 | ((val >> 3) & 7),
3629 contents + rel->r_offset - 1);
3630 break;
3631 case 0x03:
3632 /* addl */
3633 bfd_put_8 (output_bfd, 0x81,
3634 contents + rel->r_offset - 2);
3635 bfd_put_8 (output_bfd,
3636 0xc0 | ((val >> 3) & 7),
3637 contents + rel->r_offset - 1);
3638 break;
3639 default:
3640 BFD_FAIL ();
3641 break;
3642 }
3643 }
3644 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3645 contents + rel->r_offset);
3646 continue;
3647 }
3648 else
3649 {
3650 unsigned int val, type;
3651
3652 /* {IE_32,GOTIE}->LE transition:
3653 Originally it can be one of:
3654 subl foo(%reg1), %reg2
3655 movl foo(%reg1), %reg2
3656 addl foo(%reg1), %reg2
3657 We change it into:
3658 subl $foo, %reg2
3659 movl $foo, %reg2 (6 byte form)
3660 addl $foo, %reg2. */
3661 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3662 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3663 if (type == 0x8b)
3664 {
3665 /* movl */
3666 bfd_put_8 (output_bfd, 0xc7,
3667 contents + rel->r_offset - 2);
3668 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3669 contents + rel->r_offset - 1);
3670 }
3671 else if (type == 0x2b)
3672 {
3673 /* subl */
3674 bfd_put_8 (output_bfd, 0x81,
3675 contents + rel->r_offset - 2);
3676 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3677 contents + rel->r_offset - 1);
3678 }
3679 else if (type == 0x03)
3680 {
3681 /* addl */
3682 bfd_put_8 (output_bfd, 0x81,
3683 contents + rel->r_offset - 2);
3684 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3685 contents + rel->r_offset - 1);
3686 }
3687 else
3688 BFD_FAIL ();
3689 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
3690 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3691 contents + rel->r_offset);
3692 else
3693 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3694 contents + rel->r_offset);
3695 continue;
3696 }
3697 }
3698
3699 if (htab->elf.sgot == NULL)
3700 abort ();
3701
3702 if (h != NULL)
3703 {
3704 off = h->got.offset;
3705 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
3706 }
3707 else
3708 {
3709 if (local_got_offsets == NULL)
3710 abort ();
3711
3712 off = local_got_offsets[r_symndx];
3713 offplt = local_tlsdesc_gotents[r_symndx];
3714 }
3715
3716 if ((off & 1) != 0)
3717 off &= ~1;
3718 else
3719 {
3720 Elf_Internal_Rela outrel;
3721 bfd_byte *loc;
3722 int dr_type;
3723 asection *sreloc;
3724
3725 if (htab->elf.srelgot == NULL)
3726 abort ();
3727
3728 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3729
3730 if (GOT_TLS_GDESC_P (tls_type))
3731 {
3732 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3733 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3734 <= htab->elf.sgotplt->size);
3735 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3736 + htab->elf.sgotplt->output_offset
3737 + offplt
3738 + htab->sgotplt_jump_table_size);
3739 sreloc = htab->elf.srelplt;
3740 loc = sreloc->contents;
3741 loc += (htab->next_tls_desc_index++
3742 * sizeof (Elf32_External_Rel));
3743 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3744 <= sreloc->contents + sreloc->size);
3745 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3746 if (indx == 0)
3747 {
3748 BFD_ASSERT (! unresolved_reloc);
3749 bfd_put_32 (output_bfd,
3750 relocation - elf_i386_dtpoff_base (info),
3751 htab->elf.sgotplt->contents + offplt
3752 + htab->sgotplt_jump_table_size + 4);
3753 }
3754 else
3755 {
3756 bfd_put_32 (output_bfd, 0,
3757 htab->elf.sgotplt->contents + offplt
3758 + htab->sgotplt_jump_table_size + 4);
3759 }
3760 }
3761
3762 sreloc = htab->elf.srelgot;
3763
3764 outrel.r_offset = (htab->elf.sgot->output_section->vma
3765 + htab->elf.sgot->output_offset + off);
3766
3767 if (GOT_TLS_GD_P (tls_type))
3768 dr_type = R_386_TLS_DTPMOD32;
3769 else if (GOT_TLS_GDESC_P (tls_type))
3770 goto dr_done;
3771 else if (tls_type == GOT_TLS_IE_POS)
3772 dr_type = R_386_TLS_TPOFF;
3773 else
3774 dr_type = R_386_TLS_TPOFF32;
3775
3776 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3777 bfd_put_32 (output_bfd,
3778 relocation - elf_i386_dtpoff_base (info),
3779 htab->elf.sgot->contents + off);
3780 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3781 bfd_put_32 (output_bfd,
3782 elf_i386_dtpoff_base (info) - relocation,
3783 htab->elf.sgot->contents + off);
3784 else if (dr_type != R_386_TLS_DESC)
3785 bfd_put_32 (output_bfd, 0,
3786 htab->elf.sgot->contents + off);
3787 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3788
3789 loc = sreloc->contents;
3790 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3791 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3792 <= sreloc->contents + sreloc->size);
3793 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3794
3795 if (GOT_TLS_GD_P (tls_type))
3796 {
3797 if (indx == 0)
3798 {
3799 BFD_ASSERT (! unresolved_reloc);
3800 bfd_put_32 (output_bfd,
3801 relocation - elf_i386_dtpoff_base (info),
3802 htab->elf.sgot->contents + off + 4);
3803 }
3804 else
3805 {
3806 bfd_put_32 (output_bfd, 0,
3807 htab->elf.sgot->contents + off + 4);
3808 outrel.r_info = ELF32_R_INFO (indx,
3809 R_386_TLS_DTPOFF32);
3810 outrel.r_offset += 4;
3811 sreloc->reloc_count++;
3812 loc += sizeof (Elf32_External_Rel);
3813 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3814 <= sreloc->contents + sreloc->size);
3815 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3816 }
3817 }
3818 else if (tls_type == GOT_TLS_IE_BOTH)
3819 {
3820 bfd_put_32 (output_bfd,
3821 (indx == 0
3822 ? relocation - elf_i386_dtpoff_base (info)
3823 : 0),
3824 htab->elf.sgot->contents + off + 4);
3825 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3826 outrel.r_offset += 4;
3827 sreloc->reloc_count++;
3828 loc += sizeof (Elf32_External_Rel);
3829 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3830 }
3831
3832 dr_done:
3833 if (h != NULL)
3834 h->got.offset |= 1;
3835 else
3836 local_got_offsets[r_symndx] |= 1;
3837 }
3838
3839 if (off >= (bfd_vma) -2
3840 && ! GOT_TLS_GDESC_P (tls_type))
3841 abort ();
3842 if (r_type == R_386_TLS_GOTDESC
3843 || r_type == R_386_TLS_DESC_CALL)
3844 {
3845 relocation = htab->sgotplt_jump_table_size + offplt;
3846 unresolved_reloc = FALSE;
3847 }
3848 else if (r_type == ELF32_R_TYPE (rel->r_info))
3849 {
3850 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3851 + htab->elf.sgotplt->output_offset;
3852 relocation = htab->elf.sgot->output_section->vma
3853 + htab->elf.sgot->output_offset + off - g_o_t;
3854 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3855 && tls_type == GOT_TLS_IE_BOTH)
3856 relocation += 4;
3857 if (r_type == R_386_TLS_IE)
3858 relocation += g_o_t;
3859 unresolved_reloc = FALSE;
3860 }
3861 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3862 {
3863 unsigned int val, type;
3864 bfd_vma roff;
3865
3866 /* GD->IE transition. */
3867 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3868 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3869 if (type == 0x04)
3870 {
3871 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3872 Change it into:
3873 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3874 val >>= 3;
3875 roff = rel->r_offset - 3;
3876 }
3877 else
3878 {
3879 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3880 Change it into:
3881 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3882 roff = rel->r_offset - 2;
3883 }
3884 memcpy (contents + roff,
3885 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3886 contents[roff + 7] = 0x80 | (val & 7);
3887 /* If foo is used only with foo@gotntpoff(%reg) and
3888 foo@indntpoff, but not with foo@gottpoff(%reg), change
3889 subl $foo@gottpoff(%reg), %eax
3890 into:
3891 addl $foo@gotntpoff(%reg), %eax. */
3892 if (tls_type == GOT_TLS_IE_POS)
3893 contents[roff + 6] = 0x03;
3894 bfd_put_32 (output_bfd,
3895 htab->elf.sgot->output_section->vma
3896 + htab->elf.sgot->output_offset + off
3897 - htab->elf.sgotplt->output_section->vma
3898 - htab->elf.sgotplt->output_offset,
3899 contents + roff + 8);
3900 /* Skip R_386_PLT32. */
3901 rel++;
3902 continue;
3903 }
3904 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3905 {
3906 /* GDesc -> IE transition.
3907 It's originally something like:
3908 leal x@tlsdesc(%ebx), %eax
3909
3910 Change it to:
3911 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3912 or:
3913 movl x@gottpoff(%ebx), %eax # before negl %eax
3914
3915 Registers other than %eax may be set up here. */
3916
3917 bfd_vma roff;
3918
3919 /* First, make sure it's a leal adding ebx to a 32-bit
3920 offset into any register, although it's probably
3921 almost always going to be eax. */
3922 roff = rel->r_offset;
3923
3924 /* Now modify the instruction as appropriate. */
3925 /* To turn a leal into a movl in the form we use it, it
3926 suffices to change the first byte from 0x8d to 0x8b.
3927 aoliva FIXME: should we decide to keep the leal, all
3928 we have to do is remove the statement below, and
3929 adjust the relaxation of R_386_TLS_DESC_CALL. */
3930 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3931
3932 if (tls_type == GOT_TLS_IE_BOTH)
3933 off += 4;
3934
3935 bfd_put_32 (output_bfd,
3936 htab->elf.sgot->output_section->vma
3937 + htab->elf.sgot->output_offset + off
3938 - htab->elf.sgotplt->output_section->vma
3939 - htab->elf.sgotplt->output_offset,
3940 contents + roff);
3941 continue;
3942 }
3943 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3944 {
3945 /* GDesc -> IE transition.
3946 It's originally:
3947 call *(%eax)
3948
3949 Change it to:
3950 xchg %ax,%ax
3951 or
3952 negl %eax
3953 depending on how we transformed the TLS_GOTDESC above.
3954 */
3955
3956 bfd_vma roff;
3957
3958 roff = rel->r_offset;
3959
3960 /* Now modify the instruction as appropriate. */
3961 if (tls_type != GOT_TLS_IE_NEG)
3962 {
3963 /* xchg %ax,%ax */
3964 bfd_put_8 (output_bfd, 0x66, contents + roff);
3965 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3966 }
3967 else
3968 {
3969 /* negl %eax */
3970 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3971 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3972 }
3973
3974 continue;
3975 }
3976 else
3977 BFD_ASSERT (FALSE);
3978 break;
3979
3980 case R_386_TLS_LDM:
3981 if (! elf_i386_tls_transition (info, input_bfd,
3982 input_section, contents,
3983 symtab_hdr, sym_hashes,
3984 &r_type, GOT_UNKNOWN, rel,
3985 relend, h, r_symndx))
3986 return FALSE;
3987
3988 if (r_type != R_386_TLS_LDM)
3989 {
3990 /* LD->LE transition:
3991 leal foo(%reg), %eax; call ___tls_get_addr.
3992 We change it into:
3993 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3994 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3995 memcpy (contents + rel->r_offset - 2,
3996 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3997 /* Skip R_386_PC32/R_386_PLT32. */
3998 rel++;
3999 continue;
4000 }
4001
4002 if (htab->elf.sgot == NULL)
4003 abort ();
4004
4005 off = htab->tls_ldm_got.offset;
4006 if (off & 1)
4007 off &= ~1;
4008 else
4009 {
4010 Elf_Internal_Rela outrel;
4011 bfd_byte *loc;
4012
4013 if (htab->elf.srelgot == NULL)
4014 abort ();
4015
4016 outrel.r_offset = (htab->elf.sgot->output_section->vma
4017 + htab->elf.sgot->output_offset + off);
4018
4019 bfd_put_32 (output_bfd, 0,
4020 htab->elf.sgot->contents + off);
4021 bfd_put_32 (output_bfd, 0,
4022 htab->elf.sgot->contents + off + 4);
4023 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4024 loc = htab->elf.srelgot->contents;
4025 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4026 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4027 htab->tls_ldm_got.offset |= 1;
4028 }
4029 relocation = htab->elf.sgot->output_section->vma
4030 + htab->elf.sgot->output_offset + off
4031 - htab->elf.sgotplt->output_section->vma
4032 - htab->elf.sgotplt->output_offset;
4033 unresolved_reloc = FALSE;
4034 break;
4035
4036 case R_386_TLS_LDO_32:
4037 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4038 relocation -= elf_i386_dtpoff_base (info);
4039 else
4040 /* When converting LDO to LE, we must negate. */
4041 relocation = -elf_i386_tpoff (info, relocation);
4042 break;
4043
4044 case R_386_TLS_LE_32:
4045 case R_386_TLS_LE:
4046 if (!info->executable)
4047 {
4048 Elf_Internal_Rela outrel;
4049 asection *sreloc;
4050 bfd_byte *loc;
4051
4052 outrel.r_offset = rel->r_offset
4053 + input_section->output_section->vma
4054 + input_section->output_offset;
4055 if (h != NULL && h->dynindx != -1)
4056 indx = h->dynindx;
4057 else
4058 indx = 0;
4059 if (r_type == R_386_TLS_LE_32)
4060 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4061 else
4062 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4063 sreloc = elf_section_data (input_section)->sreloc;
4064 if (sreloc == NULL)
4065 abort ();
4066 loc = sreloc->contents;
4067 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
4068 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4069 if (indx)
4070 continue;
4071 else if (r_type == R_386_TLS_LE_32)
4072 relocation = elf_i386_dtpoff_base (info) - relocation;
4073 else
4074 relocation -= elf_i386_dtpoff_base (info);
4075 }
4076 else if (r_type == R_386_TLS_LE_32)
4077 relocation = elf_i386_tpoff (info, relocation);
4078 else
4079 relocation = -elf_i386_tpoff (info, relocation);
4080 break;
4081
4082 default:
4083 break;
4084 }
4085
4086 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4087 because such sections are not SEC_ALLOC and thus ld.so will
4088 not process them. */
4089 if (unresolved_reloc
4090 && !((input_section->flags & SEC_DEBUGGING) != 0
4091 && h->def_dynamic))
4092 {
4093 (*_bfd_error_handler)
4094 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4095 input_bfd,
4096 input_section,
4097 (long) rel->r_offset,
4098 howto->name,
4099 h->root.root.string);
4100 return FALSE;
4101 }
4102
4103 do_relocation:
4104 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4105 contents, rel->r_offset,
4106 relocation, 0);
4107
4108 check_relocation_error:
4109 if (r != bfd_reloc_ok)
4110 {
4111 const char *name;
4112
4113 if (h != NULL)
4114 name = h->root.root.string;
4115 else
4116 {
4117 name = bfd_elf_string_from_elf_section (input_bfd,
4118 symtab_hdr->sh_link,
4119 sym->st_name);
4120 if (name == NULL)
4121 return FALSE;
4122 if (*name == '\0')
4123 name = bfd_section_name (input_bfd, sec);
4124 }
4125
4126 if (r == bfd_reloc_overflow)
4127 {
4128 if (! ((*info->callbacks->reloc_overflow)
4129 (info, (h ? &h->root : NULL), name, howto->name,
4130 (bfd_vma) 0, input_bfd, input_section,
4131 rel->r_offset)))
4132 return FALSE;
4133 }
4134 else
4135 {
4136 (*_bfd_error_handler)
4137 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4138 input_bfd, input_section,
4139 (long) rel->r_offset, name, (int) r);
4140 return FALSE;
4141 }
4142 }
4143 }
4144
4145 return TRUE;
4146 }
4147
4148 /* Finish up dynamic symbol handling. We set the contents of various
4149 dynamic sections here. */
4150
4151 static bfd_boolean
4152 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4153 struct bfd_link_info *info,
4154 struct elf_link_hash_entry *h,
4155 Elf_Internal_Sym *sym)
4156 {
4157 struct elf_i386_link_hash_table *htab;
4158
4159 htab = elf_i386_hash_table (info);
4160 if (htab == NULL)
4161 return FALSE;
4162
4163 if (h->plt.offset != (bfd_vma) -1)
4164 {
4165 bfd_vma plt_index;
4166 bfd_vma got_offset;
4167 Elf_Internal_Rela rel;
4168 bfd_byte *loc;
4169 asection *plt, *gotplt, *relplt;
4170
4171 /* When building a static executable, use .iplt, .igot.plt and
4172 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4173 if (htab->elf.splt != NULL)
4174 {
4175 plt = htab->elf.splt;
4176 gotplt = htab->elf.sgotplt;
4177 relplt = htab->elf.srelplt;
4178 }
4179 else
4180 {
4181 plt = htab->elf.iplt;
4182 gotplt = htab->elf.igotplt;
4183 relplt = htab->elf.irelplt;
4184 }
4185
4186 /* This symbol has an entry in the procedure linkage table. Set
4187 it up. */
4188
4189 if ((h->dynindx == -1
4190 && !((h->forced_local || info->executable)
4191 && h->def_regular
4192 && h->type == STT_GNU_IFUNC))
4193 || plt == NULL
4194 || gotplt == NULL
4195 || relplt == NULL)
4196 return FALSE;
4197
4198 /* Get the index in the procedure linkage table which
4199 corresponds to this symbol. This is the index of this symbol
4200 in all the symbols for which we are making plt entries. The
4201 first entry in the procedure linkage table is reserved.
4202
4203 Get the offset into the .got table of the entry that
4204 corresponds to this function. Each .got entry is 4 bytes.
4205 The first three are reserved.
4206
4207 For static executables, we don't reserve anything. */
4208
4209 if (plt == htab->elf.splt)
4210 {
4211 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
4212 got_offset = (plt_index + 3) * 4;
4213 }
4214 else
4215 {
4216 plt_index = h->plt.offset / PLT_ENTRY_SIZE;
4217 got_offset = plt_index * 4;
4218 }
4219
4220 /* Fill in the entry in the procedure linkage table. */
4221 if (! info->shared)
4222 {
4223 memcpy (plt->contents + h->plt.offset, elf_i386_plt_entry,
4224 PLT_ENTRY_SIZE);
4225 bfd_put_32 (output_bfd,
4226 (gotplt->output_section->vma
4227 + gotplt->output_offset
4228 + got_offset),
4229 plt->contents + h->plt.offset + 2);
4230
4231 if (htab->is_vxworks)
4232 {
4233 int s, k, reloc_index;
4234
4235 /* Create the R_386_32 relocation referencing the GOT
4236 for this PLT entry. */
4237
4238 /* S: Current slot number (zero-based). */
4239 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
4240 /* K: Number of relocations for PLTResolve. */
4241 if (info->shared)
4242 k = PLTRESOLVE_RELOCS_SHLIB;
4243 else
4244 k = PLTRESOLVE_RELOCS;
4245 /* Skip the PLTresolve relocations, and the relocations for
4246 the other PLT slots. */
4247 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4248 loc = (htab->srelplt2->contents + reloc_index
4249 * sizeof (Elf32_External_Rel));
4250
4251 rel.r_offset = (htab->elf.splt->output_section->vma
4252 + htab->elf.splt->output_offset
4253 + h->plt.offset + 2),
4254 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4255 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4256
4257 /* Create the R_386_32 relocation referencing the beginning of
4258 the PLT for this GOT entry. */
4259 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4260 + htab->elf.sgotplt->output_offset
4261 + got_offset);
4262 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4263 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4264 loc + sizeof (Elf32_External_Rel));
4265 }
4266 }
4267 else
4268 {
4269 memcpy (plt->contents + h->plt.offset, elf_i386_pic_plt_entry,
4270 PLT_ENTRY_SIZE);
4271 bfd_put_32 (output_bfd, got_offset,
4272 plt->contents + h->plt.offset + 2);
4273 }
4274
4275 /* Don't fill PLT entry for static executables. */
4276 if (plt == htab->elf.splt)
4277 {
4278 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4279 plt->contents + h->plt.offset + 7);
4280 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
4281 plt->contents + h->plt.offset + 12);
4282 }
4283
4284 /* Fill in the entry in the global offset table. */
4285 bfd_put_32 (output_bfd,
4286 (plt->output_section->vma
4287 + plt->output_offset
4288 + h->plt.offset
4289 + 6),
4290 gotplt->contents + got_offset);
4291
4292 /* Fill in the entry in the .rel.plt section. */
4293 rel.r_offset = (gotplt->output_section->vma
4294 + gotplt->output_offset
4295 + got_offset);
4296 if (h->dynindx == -1
4297 || ((info->executable
4298 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4299 && h->def_regular
4300 && h->type == STT_GNU_IFUNC))
4301 {
4302 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4303 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4304 in the .got.plt section. */
4305 bfd_put_32 (output_bfd,
4306 (h->root.u.def.value
4307 + h->root.u.def.section->output_section->vma
4308 + h->root.u.def.section->output_offset),
4309 gotplt->contents + got_offset);
4310 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4311 }
4312 else
4313 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4314 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4315 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4316
4317 if (!h->def_regular)
4318 {
4319 /* Mark the symbol as undefined, rather than as defined in
4320 the .plt section. Leave the value if there were any
4321 relocations where pointer equality matters (this is a clue
4322 for the dynamic linker, to make function pointer
4323 comparisons work between an application and shared
4324 library), otherwise set it to zero. If a function is only
4325 called from a binary, there is no need to slow down
4326 shared libraries because of that. */
4327 sym->st_shndx = SHN_UNDEF;
4328 if (!h->pointer_equality_needed)
4329 sym->st_value = 0;
4330 }
4331 }
4332
4333 if (h->got.offset != (bfd_vma) -1
4334 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4335 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4336 {
4337 Elf_Internal_Rela rel;
4338 bfd_byte *loc;
4339
4340 /* This symbol has an entry in the global offset table. Set it
4341 up. */
4342
4343 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4344 abort ();
4345
4346 rel.r_offset = (htab->elf.sgot->output_section->vma
4347 + htab->elf.sgot->output_offset
4348 + (h->got.offset & ~(bfd_vma) 1));
4349
4350 /* If this is a static link, or it is a -Bsymbolic link and the
4351 symbol is defined locally or was forced to be local because
4352 of a version file, we just want to emit a RELATIVE reloc.
4353 The entry in the global offset table will already have been
4354 initialized in the relocate_section function. */
4355 if (h->def_regular
4356 && h->type == STT_GNU_IFUNC)
4357 {
4358 if (info->shared)
4359 {
4360 /* Generate R_386_GLOB_DAT. */
4361 goto do_glob_dat;
4362 }
4363 else
4364 {
4365 asection *plt;
4366
4367 if (!h->pointer_equality_needed)
4368 abort ();
4369
4370 /* For non-shared object, we can't use .got.plt, which
4371 contains the real function addres if we need pointer
4372 equality. We load the GOT entry with the PLT entry. */
4373 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4374 bfd_put_32 (output_bfd,
4375 (plt->output_section->vma
4376 + plt->output_offset + h->plt.offset),
4377 htab->elf.sgot->contents + h->got.offset);
4378 return TRUE;
4379 }
4380 }
4381 else if (info->shared
4382 && SYMBOL_REFERENCES_LOCAL (info, h))
4383 {
4384 BFD_ASSERT((h->got.offset & 1) != 0);
4385 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4386 }
4387 else
4388 {
4389 BFD_ASSERT((h->got.offset & 1) == 0);
4390 do_glob_dat:
4391 bfd_put_32 (output_bfd, (bfd_vma) 0,
4392 htab->elf.sgot->contents + h->got.offset);
4393 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4394 }
4395
4396 loc = htab->elf.srelgot->contents;
4397 loc += htab->elf.srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
4398 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4399 }
4400
4401 if (h->needs_copy)
4402 {
4403 Elf_Internal_Rela rel;
4404 bfd_byte *loc;
4405
4406 /* This symbol needs a copy reloc. Set it up. */
4407
4408 if (h->dynindx == -1
4409 || (h->root.type != bfd_link_hash_defined
4410 && h->root.type != bfd_link_hash_defweak)
4411 || htab->srelbss == NULL)
4412 abort ();
4413
4414 rel.r_offset = (h->root.u.def.value
4415 + h->root.u.def.section->output_section->vma
4416 + h->root.u.def.section->output_offset);
4417 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4418 loc = htab->srelbss->contents;
4419 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
4420 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4421 }
4422
4423 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. SYM may
4424 be NULL for local symbols.
4425
4426 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
4427 is relative to the ".got" section. */
4428 if (sym != NULL
4429 && (strcmp (h->root.root.string, "_DYNAMIC") == 0
4430 || (!htab->is_vxworks && h == htab->elf.hgot)))
4431 sym->st_shndx = SHN_ABS;
4432
4433 return TRUE;
4434 }
4435
4436 /* Finish up local dynamic symbol handling. We set the contents of
4437 various dynamic sections here. */
4438
4439 static bfd_boolean
4440 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4441 {
4442 struct elf_link_hash_entry *h
4443 = (struct elf_link_hash_entry *) *slot;
4444 struct bfd_link_info *info
4445 = (struct bfd_link_info *) inf;
4446
4447 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4448 h, NULL);
4449 }
4450
4451 /* Used to decide how to sort relocs in an optimal manner for the
4452 dynamic linker, before writing them out. */
4453
4454 static enum elf_reloc_type_class
4455 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4456 {
4457 switch (ELF32_R_TYPE (rela->r_info))
4458 {
4459 case R_386_RELATIVE:
4460 return reloc_class_relative;
4461 case R_386_JUMP_SLOT:
4462 return reloc_class_plt;
4463 case R_386_COPY:
4464 return reloc_class_copy;
4465 default:
4466 return reloc_class_normal;
4467 }
4468 }
4469
4470 /* Finish up the dynamic sections. */
4471
4472 static bfd_boolean
4473 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4474 struct bfd_link_info *info)
4475 {
4476 struct elf_i386_link_hash_table *htab;
4477 bfd *dynobj;
4478 asection *sdyn;
4479
4480 htab = elf_i386_hash_table (info);
4481 if (htab == NULL)
4482 return FALSE;
4483
4484 dynobj = htab->elf.dynobj;
4485 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
4486
4487 if (htab->elf.dynamic_sections_created)
4488 {
4489 Elf32_External_Dyn *dyncon, *dynconend;
4490
4491 if (sdyn == NULL || htab->elf.sgot == NULL)
4492 abort ();
4493
4494 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4495 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4496 for (; dyncon < dynconend; dyncon++)
4497 {
4498 Elf_Internal_Dyn dyn;
4499 asection *s;
4500
4501 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4502
4503 switch (dyn.d_tag)
4504 {
4505 default:
4506 if (htab->is_vxworks
4507 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4508 break;
4509 continue;
4510
4511 case DT_PLTGOT:
4512 s = htab->elf.sgotplt;
4513 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4514 break;
4515
4516 case DT_JMPREL:
4517 s = htab->elf.srelplt;
4518 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4519 break;
4520
4521 case DT_PLTRELSZ:
4522 s = htab->elf.srelplt;
4523 dyn.d_un.d_val = s->size;
4524 break;
4525
4526 case DT_RELSZ:
4527 /* My reading of the SVR4 ABI indicates that the
4528 procedure linkage table relocs (DT_JMPREL) should be
4529 included in the overall relocs (DT_REL). This is
4530 what Solaris does. However, UnixWare can not handle
4531 that case. Therefore, we override the DT_RELSZ entry
4532 here to make it not include the JMPREL relocs. */
4533 s = htab->elf.srelplt;
4534 if (s == NULL)
4535 continue;
4536 dyn.d_un.d_val -= s->size;
4537 break;
4538
4539 case DT_REL:
4540 /* We may not be using the standard ELF linker script.
4541 If .rel.plt is the first .rel section, we adjust
4542 DT_REL to not include it. */
4543 s = htab->elf.srelplt;
4544 if (s == NULL)
4545 continue;
4546 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4547 continue;
4548 dyn.d_un.d_ptr += s->size;
4549 break;
4550 }
4551
4552 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4553 }
4554
4555 /* Fill in the first entry in the procedure linkage table. */
4556 if (htab->elf.splt && htab->elf.splt->size > 0)
4557 {
4558 if (info->shared)
4559 {
4560 memcpy (htab->elf.splt->contents, elf_i386_pic_plt0_entry,
4561 sizeof (elf_i386_pic_plt0_entry));
4562 memset (htab->elf.splt->contents + sizeof (elf_i386_pic_plt0_entry),
4563 htab->plt0_pad_byte,
4564 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
4565 }
4566 else
4567 {
4568 memcpy (htab->elf.splt->contents, elf_i386_plt0_entry,
4569 sizeof(elf_i386_plt0_entry));
4570 memset (htab->elf.splt->contents + sizeof (elf_i386_plt0_entry),
4571 htab->plt0_pad_byte,
4572 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
4573 bfd_put_32 (output_bfd,
4574 (htab->elf.sgotplt->output_section->vma
4575 + htab->elf.sgotplt->output_offset
4576 + 4),
4577 htab->elf.splt->contents + 2);
4578 bfd_put_32 (output_bfd,
4579 (htab->elf.sgotplt->output_section->vma
4580 + htab->elf.sgotplt->output_offset
4581 + 8),
4582 htab->elf.splt->contents + 8);
4583
4584 if (htab->is_vxworks)
4585 {
4586 Elf_Internal_Rela rel;
4587
4588 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4589 On IA32 we use REL relocations so the addend goes in
4590 the PLT directly. */
4591 rel.r_offset = (htab->elf.splt->output_section->vma
4592 + htab->elf.splt->output_offset
4593 + 2);
4594 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4595 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4596 htab->srelplt2->contents);
4597 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4598 rel.r_offset = (htab->elf.splt->output_section->vma
4599 + htab->elf.splt->output_offset
4600 + 8);
4601 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4602 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4603 htab->srelplt2->contents +
4604 sizeof (Elf32_External_Rel));
4605 }
4606 }
4607
4608 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4609 really seem like the right value. */
4610 elf_section_data (htab->elf.splt->output_section)
4611 ->this_hdr.sh_entsize = 4;
4612
4613 /* Correct the .rel.plt.unloaded relocations. */
4614 if (htab->is_vxworks && !info->shared)
4615 {
4616 int num_plts = (htab->elf.splt->size / PLT_ENTRY_SIZE) - 1;
4617 unsigned char *p;
4618
4619 p = htab->srelplt2->contents;
4620 if (info->shared)
4621 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4622 else
4623 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4624
4625 for (; num_plts; num_plts--)
4626 {
4627 Elf_Internal_Rela rel;
4628 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4629 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4630 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4631 p += sizeof (Elf32_External_Rel);
4632
4633 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4634 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4635 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4636 p += sizeof (Elf32_External_Rel);
4637 }
4638 }
4639 }
4640 }
4641
4642 if (htab->elf.sgotplt)
4643 {
4644 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4645 {
4646 (*_bfd_error_handler)
4647 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4648 return FALSE;
4649 }
4650
4651 /* Fill in the first three entries in the global offset table. */
4652 if (htab->elf.sgotplt->size > 0)
4653 {
4654 bfd_put_32 (output_bfd,
4655 (sdyn == NULL ? 0
4656 : sdyn->output_section->vma + sdyn->output_offset),
4657 htab->elf.sgotplt->contents);
4658 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4659 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4660 }
4661
4662 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4663 }
4664
4665 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4666 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4667
4668 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4669 htab_traverse (htab->loc_hash_table,
4670 elf_i386_finish_local_dynamic_symbol,
4671 info);
4672
4673 return TRUE;
4674 }
4675
4676 /* Return address for Ith PLT stub in section PLT, for relocation REL
4677 or (bfd_vma) -1 if it should not be included. */
4678
4679 static bfd_vma
4680 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
4681 const arelent *rel ATTRIBUTE_UNUSED)
4682 {
4683 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
4684 }
4685
4686 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
4687
4688 static bfd_boolean
4689 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
4690 {
4691 if (h->plt.offset != (bfd_vma) -1
4692 && !h->def_regular
4693 && !h->pointer_equality_needed)
4694 return FALSE;
4695
4696 return _bfd_elf_hash_symbol (h);
4697 }
4698
4699 /* Hook called by the linker routine which adds symbols from an object
4700 file. */
4701
4702 static bfd_boolean
4703 elf_i386_add_symbol_hook (bfd * abfd,
4704 struct bfd_link_info * info ATTRIBUTE_UNUSED,
4705 Elf_Internal_Sym * sym,
4706 const char ** namep ATTRIBUTE_UNUSED,
4707 flagword * flagsp ATTRIBUTE_UNUSED,
4708 asection ** secp ATTRIBUTE_UNUSED,
4709 bfd_vma * valp ATTRIBUTE_UNUSED)
4710 {
4711 if ((abfd->flags & DYNAMIC) == 0
4712 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
4713 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
4714 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
4715
4716 return TRUE;
4717 }
4718
4719 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
4720 #define TARGET_LITTLE_NAME "elf32-i386"
4721 #define ELF_ARCH bfd_arch_i386
4722 #define ELF_TARGET_ID I386_ELF_DATA
4723 #define ELF_MACHINE_CODE EM_386
4724 #define ELF_MAXPAGESIZE 0x1000
4725
4726 #define elf_backend_can_gc_sections 1
4727 #define elf_backend_can_refcount 1
4728 #define elf_backend_want_got_plt 1
4729 #define elf_backend_plt_readonly 1
4730 #define elf_backend_want_plt_sym 0
4731 #define elf_backend_got_header_size 12
4732
4733 /* Support RELA for objdump of prelink objects. */
4734 #define elf_info_to_howto elf_i386_info_to_howto_rel
4735 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4736
4737 #define bfd_elf32_mkobject elf_i386_mkobject
4738
4739 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4740 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
4741 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
4742 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4743 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4744
4745 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
4746 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4747 #define elf_backend_check_relocs elf_i386_check_relocs
4748 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
4749 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
4750 #define elf_backend_fake_sections elf_i386_fake_sections
4751 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4752 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4753 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
4754 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
4755 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4756 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4757 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4758 #define elf_backend_relocate_section elf_i386_relocate_section
4759 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
4760 #define elf_backend_always_size_sections elf_i386_always_size_sections
4761 #define elf_backend_omit_section_dynsym \
4762 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
4763 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
4764 #define elf_backend_hash_symbol elf_i386_hash_symbol
4765 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
4766 #undef elf_backend_post_process_headers
4767 #define elf_backend_post_process_headers _bfd_elf_set_osabi
4768
4769 #include "elf32-target.h"
4770
4771 /* FreeBSD support. */
4772
4773 #undef TARGET_LITTLE_SYM
4774 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
4775 #undef TARGET_LITTLE_NAME
4776 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4777 #undef ELF_OSABI
4778 #define ELF_OSABI ELFOSABI_FREEBSD
4779
4780 /* The kernel recognizes executables as valid only if they carry a
4781 "FreeBSD" label in the ELF header. So we put this label on all
4782 executables and (for simplicity) also all other object files. */
4783
4784 static void
4785 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4786 {
4787 _bfd_elf_set_osabi (abfd, info);
4788
4789 #ifdef OLD_FREEBSD_ABI_LABEL
4790 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4791 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4792 #endif
4793 }
4794
4795 #undef elf_backend_post_process_headers
4796 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4797 #undef elf32_bed
4798 #define elf32_bed elf32_i386_fbsd_bed
4799
4800 #undef elf_backend_add_symbol_hook
4801
4802 #include "elf32-target.h"
4803
4804 /* Solaris 2. */
4805
4806 #undef TARGET_LITTLE_SYM
4807 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
4808 #undef TARGET_LITTLE_NAME
4809 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4810
4811 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4812 objects won't be recognized. */
4813 #undef ELF_OSABI
4814
4815 #undef elf32_bed
4816 #define elf32_bed elf32_i386_sol2_bed
4817
4818 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4819 boundary. */
4820 #undef elf_backend_static_tls_alignment
4821 #define elf_backend_static_tls_alignment 8
4822
4823 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4824
4825 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4826 File, p.63. */
4827 #undef elf_backend_want_plt_sym
4828 #define elf_backend_want_plt_sym 1
4829
4830 #include "elf32-target.h"
4831
4832 /* VxWorks support. */
4833
4834 #undef TARGET_LITTLE_SYM
4835 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
4836 #undef TARGET_LITTLE_NAME
4837 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4838 #undef ELF_OSABI
4839
4840 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
4841
4842 static struct bfd_link_hash_table *
4843 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
4844 {
4845 struct bfd_link_hash_table *ret;
4846 struct elf_i386_link_hash_table *htab;
4847
4848 ret = elf_i386_link_hash_table_create (abfd);
4849 if (ret)
4850 {
4851 htab = (struct elf_i386_link_hash_table *) ret;
4852 htab->is_vxworks = 1;
4853 htab->plt0_pad_byte = 0x90;
4854 }
4855
4856 return ret;
4857 }
4858
4859
4860 #undef elf_backend_relocs_compatible
4861 #undef elf_backend_post_process_headers
4862 #undef bfd_elf32_bfd_link_hash_table_create
4863 #define bfd_elf32_bfd_link_hash_table_create \
4864 elf_i386_vxworks_link_hash_table_create
4865 #undef elf_backend_add_symbol_hook
4866 #define elf_backend_add_symbol_hook \
4867 elf_vxworks_add_symbol_hook
4868 #undef elf_backend_link_output_symbol_hook
4869 #define elf_backend_link_output_symbol_hook \
4870 elf_vxworks_link_output_symbol_hook
4871 #undef elf_backend_emit_relocs
4872 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4873 #undef elf_backend_final_write_processing
4874 #define elf_backend_final_write_processing \
4875 elf_vxworks_final_write_processing
4876 #undef elf_backend_static_tls_alignment
4877
4878 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4879 define it. */
4880 #undef elf_backend_want_plt_sym
4881 #define elf_backend_want_plt_sym 1
4882
4883 #undef elf32_bed
4884 #define elf32_bed elf32_i386_vxworks_bed
4885
4886 #include "elf32-target.h"