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