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Resolve size relocation against non-zero TLS symbol
[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 bfd_boolean size_reloc;
1458
1459 r_symndx = ELF32_R_SYM (rel->r_info);
1460 r_type = ELF32_R_TYPE (rel->r_info);
1461
1462 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1463 {
1464 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1465 abfd,
1466 r_symndx);
1467 return FALSE;
1468 }
1469
1470 if (r_symndx < symtab_hdr->sh_info)
1471 {
1472 /* A local symbol. */
1473 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1474 abfd, r_symndx);
1475 if (isym == NULL)
1476 return FALSE;
1477
1478 /* Check relocation against local STT_GNU_IFUNC symbol. */
1479 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1480 {
1481 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1482 if (h == NULL)
1483 return FALSE;
1484
1485 /* Fake a STT_GNU_IFUNC symbol. */
1486 h->type = STT_GNU_IFUNC;
1487 h->def_regular = 1;
1488 h->ref_regular = 1;
1489 h->forced_local = 1;
1490 h->root.type = bfd_link_hash_defined;
1491 }
1492 else
1493 h = NULL;
1494 }
1495 else
1496 {
1497 isym = NULL;
1498 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1499 while (h->root.type == bfd_link_hash_indirect
1500 || h->root.type == bfd_link_hash_warning)
1501 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1502 }
1503
1504 if (h != NULL)
1505 {
1506 /* Create the ifunc sections for static executables. If we
1507 never see an indirect function symbol nor we are building
1508 a static executable, those sections will be empty and
1509 won't appear in output. */
1510 switch (r_type)
1511 {
1512 default:
1513 break;
1514
1515 case R_386_32:
1516 case R_386_PC32:
1517 case R_386_PLT32:
1518 case R_386_GOT32:
1519 case R_386_GOTOFF:
1520 if (htab->elf.dynobj == NULL)
1521 htab->elf.dynobj = abfd;
1522 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1523 return FALSE;
1524 break;
1525 }
1526
1527 /* It is referenced by a non-shared object. */
1528 h->ref_regular = 1;
1529 }
1530
1531 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1532 symtab_hdr, sym_hashes,
1533 &r_type, GOT_UNKNOWN,
1534 rel, rel_end, h, r_symndx))
1535 return FALSE;
1536
1537 switch (r_type)
1538 {
1539 case R_386_TLS_LDM:
1540 htab->tls_ldm_got.refcount += 1;
1541 goto create_got;
1542
1543 case R_386_PLT32:
1544 /* This symbol requires a procedure linkage table entry. We
1545 actually build the entry in adjust_dynamic_symbol,
1546 because this might be a case of linking PIC code which is
1547 never referenced by a dynamic object, in which case we
1548 don't need to generate a procedure linkage table entry
1549 after all. */
1550
1551 /* If this is a local symbol, we resolve it directly without
1552 creating a procedure linkage table entry. */
1553 if (h == NULL)
1554 continue;
1555
1556 h->needs_plt = 1;
1557 h->plt.refcount += 1;
1558 break;
1559
1560 case R_386_SIZE32:
1561 size_reloc = TRUE;
1562 goto do_size;
1563
1564 case R_386_TLS_IE_32:
1565 case R_386_TLS_IE:
1566 case R_386_TLS_GOTIE:
1567 if (!info->executable)
1568 info->flags |= DF_STATIC_TLS;
1569 /* Fall through */
1570
1571 case R_386_GOT32:
1572 case R_386_TLS_GD:
1573 case R_386_TLS_GOTDESC:
1574 case R_386_TLS_DESC_CALL:
1575 /* This symbol requires a global offset table entry. */
1576 {
1577 int tls_type, old_tls_type;
1578
1579 switch (r_type)
1580 {
1581 default:
1582 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1583 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1584 case R_386_TLS_GOTDESC:
1585 case R_386_TLS_DESC_CALL:
1586 tls_type = GOT_TLS_GDESC; break;
1587 case R_386_TLS_IE_32:
1588 if (ELF32_R_TYPE (rel->r_info) == r_type)
1589 tls_type = GOT_TLS_IE_NEG;
1590 else
1591 /* If this is a GD->IE transition, we may use either of
1592 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1593 tls_type = GOT_TLS_IE;
1594 break;
1595 case R_386_TLS_IE:
1596 case R_386_TLS_GOTIE:
1597 tls_type = GOT_TLS_IE_POS; break;
1598 }
1599
1600 if (h != NULL)
1601 {
1602 h->got.refcount += 1;
1603 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1604 }
1605 else
1606 {
1607 bfd_signed_vma *local_got_refcounts;
1608
1609 /* This is a global offset table entry for a local symbol. */
1610 local_got_refcounts = elf_local_got_refcounts (abfd);
1611 if (local_got_refcounts == NULL)
1612 {
1613 bfd_size_type size;
1614
1615 size = symtab_hdr->sh_info;
1616 size *= (sizeof (bfd_signed_vma)
1617 + sizeof (bfd_vma) + sizeof(char));
1618 local_got_refcounts = (bfd_signed_vma *)
1619 bfd_zalloc (abfd, size);
1620 if (local_got_refcounts == NULL)
1621 return FALSE;
1622 elf_local_got_refcounts (abfd) = local_got_refcounts;
1623 elf_i386_local_tlsdesc_gotent (abfd)
1624 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1625 elf_i386_local_got_tls_type (abfd)
1626 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1627 }
1628 local_got_refcounts[r_symndx] += 1;
1629 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1630 }
1631
1632 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1633 tls_type |= old_tls_type;
1634 /* If a TLS symbol is accessed using IE at least once,
1635 there is no point to use dynamic model for it. */
1636 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1637 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1638 || (tls_type & GOT_TLS_IE) == 0))
1639 {
1640 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1641 tls_type = old_tls_type;
1642 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1643 && GOT_TLS_GD_ANY_P (tls_type))
1644 tls_type |= old_tls_type;
1645 else
1646 {
1647 if (h)
1648 name = h->root.root.string;
1649 else
1650 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1651 NULL);
1652 (*_bfd_error_handler)
1653 (_("%B: `%s' accessed both as normal and "
1654 "thread local symbol"),
1655 abfd, name);
1656 bfd_set_error (bfd_error_bad_value);
1657 return FALSE;
1658 }
1659 }
1660
1661 if (old_tls_type != tls_type)
1662 {
1663 if (h != NULL)
1664 elf_i386_hash_entry (h)->tls_type = tls_type;
1665 else
1666 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1667 }
1668 }
1669 /* Fall through */
1670
1671 case R_386_GOTOFF:
1672 case R_386_GOTPC:
1673 create_got:
1674 if (htab->elf.sgot == NULL)
1675 {
1676 if (htab->elf.dynobj == NULL)
1677 htab->elf.dynobj = abfd;
1678 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1679 return FALSE;
1680 }
1681 if (r_type != R_386_TLS_IE)
1682 break;
1683 /* Fall through */
1684
1685 case R_386_TLS_LE_32:
1686 case R_386_TLS_LE:
1687 if (info->executable)
1688 break;
1689 info->flags |= DF_STATIC_TLS;
1690 /* Fall through */
1691
1692 case R_386_32:
1693 case R_386_PC32:
1694 if (h != NULL && info->executable)
1695 {
1696 /* If this reloc is in a read-only section, we might
1697 need a copy reloc. We can't check reliably at this
1698 stage whether the section is read-only, as input
1699 sections have not yet been mapped to output sections.
1700 Tentatively set the flag for now, and correct in
1701 adjust_dynamic_symbol. */
1702 h->non_got_ref = 1;
1703
1704 /* We may need a .plt entry if the function this reloc
1705 refers to is in a shared lib. */
1706 h->plt.refcount += 1;
1707 if (r_type != R_386_PC32)
1708 h->pointer_equality_needed = 1;
1709 }
1710
1711 size_reloc = FALSE;
1712 do_size:
1713 /* If we are creating a shared library, and this is a reloc
1714 against a global symbol, or a non PC relative reloc
1715 against a local symbol, then we need to copy the reloc
1716 into the shared library. However, if we are linking with
1717 -Bsymbolic, we do not need to copy a reloc against a
1718 global symbol which is defined in an object we are
1719 including in the link (i.e., DEF_REGULAR is set). At
1720 this point we have not seen all the input files, so it is
1721 possible that DEF_REGULAR is not set now but will be set
1722 later (it is never cleared). In case of a weak definition,
1723 DEF_REGULAR may be cleared later by a strong definition in
1724 a shared library. We account for that possibility below by
1725 storing information in the relocs_copied field of the hash
1726 table entry. A similar situation occurs when creating
1727 shared libraries and symbol visibility changes render the
1728 symbol local.
1729
1730 If on the other hand, we are creating an executable, we
1731 may need to keep relocations for symbols satisfied by a
1732 dynamic library if we manage to avoid copy relocs for the
1733 symbol. */
1734 if ((info->shared
1735 && (sec->flags & SEC_ALLOC) != 0
1736 && (r_type != R_386_PC32
1737 || (h != NULL
1738 && (! SYMBOLIC_BIND (info, h)
1739 || h->root.type == bfd_link_hash_defweak
1740 || !h->def_regular))))
1741 || (ELIMINATE_COPY_RELOCS
1742 && !info->shared
1743 && (sec->flags & SEC_ALLOC) != 0
1744 && h != NULL
1745 && (h->root.type == bfd_link_hash_defweak
1746 || !h->def_regular)))
1747 {
1748 struct elf_dyn_relocs *p;
1749 struct elf_dyn_relocs **head;
1750
1751 /* We must copy these reloc types into the output file.
1752 Create a reloc section in dynobj and make room for
1753 this reloc. */
1754 if (sreloc == NULL)
1755 {
1756 if (htab->elf.dynobj == NULL)
1757 htab->elf.dynobj = abfd;
1758
1759 sreloc = _bfd_elf_make_dynamic_reloc_section
1760 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1761
1762 if (sreloc == NULL)
1763 return FALSE;
1764 }
1765
1766 /* If this is a global symbol, we count the number of
1767 relocations we need for this symbol. */
1768 if (h != NULL)
1769 {
1770 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1771 }
1772 else
1773 {
1774 /* Track dynamic relocs needed for local syms too.
1775 We really need local syms available to do this
1776 easily. Oh well. */
1777 void **vpp;
1778 asection *s;
1779
1780 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1781 abfd, r_symndx);
1782 if (isym == NULL)
1783 return FALSE;
1784
1785 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1786 if (s == NULL)
1787 s = sec;
1788
1789 vpp = &elf_section_data (s)->local_dynrel;
1790 head = (struct elf_dyn_relocs **)vpp;
1791 }
1792
1793 p = *head;
1794 if (p == NULL || p->sec != sec)
1795 {
1796 bfd_size_type amt = sizeof *p;
1797 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1798 amt);
1799 if (p == NULL)
1800 return FALSE;
1801 p->next = *head;
1802 *head = p;
1803 p->sec = sec;
1804 p->count = 0;
1805 p->pc_count = 0;
1806 }
1807
1808 p->count += 1;
1809 /* Count size relocation as PC-relative relocation. */
1810 if (r_type == R_386_PC32 || size_reloc)
1811 p->pc_count += 1;
1812 }
1813 break;
1814
1815 /* This relocation describes the C++ object vtable hierarchy.
1816 Reconstruct it for later use during GC. */
1817 case R_386_GNU_VTINHERIT:
1818 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1819 return FALSE;
1820 break;
1821
1822 /* This relocation describes which C++ vtable entries are actually
1823 used. Record for later use during GC. */
1824 case R_386_GNU_VTENTRY:
1825 BFD_ASSERT (h != NULL);
1826 if (h != NULL
1827 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1828 return FALSE;
1829 break;
1830
1831 default:
1832 break;
1833 }
1834 }
1835
1836 return TRUE;
1837 }
1838
1839 /* Return the section that should be marked against GC for a given
1840 relocation. */
1841
1842 static asection *
1843 elf_i386_gc_mark_hook (asection *sec,
1844 struct bfd_link_info *info,
1845 Elf_Internal_Rela *rel,
1846 struct elf_link_hash_entry *h,
1847 Elf_Internal_Sym *sym)
1848 {
1849 if (h != NULL)
1850 switch (ELF32_R_TYPE (rel->r_info))
1851 {
1852 case R_386_GNU_VTINHERIT:
1853 case R_386_GNU_VTENTRY:
1854 return NULL;
1855 }
1856
1857 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1858 }
1859
1860 /* Update the got entry reference counts for the section being removed. */
1861
1862 static bfd_boolean
1863 elf_i386_gc_sweep_hook (bfd *abfd,
1864 struct bfd_link_info *info,
1865 asection *sec,
1866 const Elf_Internal_Rela *relocs)
1867 {
1868 struct elf_i386_link_hash_table *htab;
1869 Elf_Internal_Shdr *symtab_hdr;
1870 struct elf_link_hash_entry **sym_hashes;
1871 bfd_signed_vma *local_got_refcounts;
1872 const Elf_Internal_Rela *rel, *relend;
1873
1874 if (info->relocatable)
1875 return TRUE;
1876
1877 htab = elf_i386_hash_table (info);
1878 if (htab == NULL)
1879 return FALSE;
1880
1881 elf_section_data (sec)->local_dynrel = NULL;
1882
1883 symtab_hdr = &elf_symtab_hdr (abfd);
1884 sym_hashes = elf_sym_hashes (abfd);
1885 local_got_refcounts = elf_local_got_refcounts (abfd);
1886
1887 relend = relocs + sec->reloc_count;
1888 for (rel = relocs; rel < relend; rel++)
1889 {
1890 unsigned long r_symndx;
1891 unsigned int r_type;
1892 struct elf_link_hash_entry *h = NULL;
1893
1894 r_symndx = ELF32_R_SYM (rel->r_info);
1895 if (r_symndx >= symtab_hdr->sh_info)
1896 {
1897 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1898 while (h->root.type == bfd_link_hash_indirect
1899 || h->root.type == bfd_link_hash_warning)
1900 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1901 }
1902 else
1903 {
1904 /* A local symbol. */
1905 Elf_Internal_Sym *isym;
1906
1907 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1908 abfd, r_symndx);
1909
1910 /* Check relocation against local STT_GNU_IFUNC symbol. */
1911 if (isym != NULL
1912 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1913 {
1914 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
1915 if (h == NULL)
1916 abort ();
1917 }
1918 }
1919
1920 if (h)
1921 {
1922 struct elf_i386_link_hash_entry *eh;
1923 struct elf_dyn_relocs **pp;
1924 struct elf_dyn_relocs *p;
1925
1926 eh = (struct elf_i386_link_hash_entry *) h;
1927 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1928 if (p->sec == sec)
1929 {
1930 /* Everything must go for SEC. */
1931 *pp = p->next;
1932 break;
1933 }
1934 }
1935
1936 r_type = ELF32_R_TYPE (rel->r_info);
1937 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1938 symtab_hdr, sym_hashes,
1939 &r_type, GOT_UNKNOWN,
1940 rel, relend, h, r_symndx))
1941 return FALSE;
1942
1943 switch (r_type)
1944 {
1945 case R_386_TLS_LDM:
1946 if (htab->tls_ldm_got.refcount > 0)
1947 htab->tls_ldm_got.refcount -= 1;
1948 break;
1949
1950 case R_386_TLS_GD:
1951 case R_386_TLS_GOTDESC:
1952 case R_386_TLS_DESC_CALL:
1953 case R_386_TLS_IE_32:
1954 case R_386_TLS_IE:
1955 case R_386_TLS_GOTIE:
1956 case R_386_GOT32:
1957 if (h != NULL)
1958 {
1959 if (h->got.refcount > 0)
1960 h->got.refcount -= 1;
1961 if (h->type == STT_GNU_IFUNC)
1962 {
1963 if (h->plt.refcount > 0)
1964 h->plt.refcount -= 1;
1965 }
1966 }
1967 else if (local_got_refcounts != NULL)
1968 {
1969 if (local_got_refcounts[r_symndx] > 0)
1970 local_got_refcounts[r_symndx] -= 1;
1971 }
1972 break;
1973
1974 case R_386_32:
1975 case R_386_PC32:
1976 case R_386_SIZE32:
1977 if (info->shared
1978 && (h == NULL || h->type != STT_GNU_IFUNC))
1979 break;
1980 /* Fall through */
1981
1982 case R_386_PLT32:
1983 if (h != NULL)
1984 {
1985 if (h->plt.refcount > 0)
1986 h->plt.refcount -= 1;
1987 }
1988 break;
1989
1990 case R_386_GOTOFF:
1991 if (h != NULL && h->type == STT_GNU_IFUNC)
1992 {
1993 if (h->got.refcount > 0)
1994 h->got.refcount -= 1;
1995 if (h->plt.refcount > 0)
1996 h->plt.refcount -= 1;
1997 }
1998 break;
1999
2000 default:
2001 break;
2002 }
2003 }
2004
2005 return TRUE;
2006 }
2007
2008 /* Adjust a symbol defined by a dynamic object and referenced by a
2009 regular object. The current definition is in some section of the
2010 dynamic object, but we're not including those sections. We have to
2011 change the definition to something the rest of the link can
2012 understand. */
2013
2014 static bfd_boolean
2015 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2016 struct elf_link_hash_entry *h)
2017 {
2018 struct elf_i386_link_hash_table *htab;
2019 asection *s;
2020 struct elf_i386_link_hash_entry *eh;
2021 struct elf_dyn_relocs *p;
2022
2023 /* STT_GNU_IFUNC symbol must go through PLT. */
2024 if (h->type == STT_GNU_IFUNC)
2025 {
2026 /* All local STT_GNU_IFUNC references must be treate as local
2027 calls via local PLT. */
2028 if (h->ref_regular
2029 && SYMBOL_CALLS_LOCAL (info, h))
2030 {
2031 bfd_size_type pc_count = 0, count = 0;
2032 struct elf_dyn_relocs **pp;
2033
2034 eh = (struct elf_i386_link_hash_entry *) h;
2035 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2036 {
2037 pc_count += p->pc_count;
2038 p->count -= p->pc_count;
2039 p->pc_count = 0;
2040 count += p->count;
2041 if (p->count == 0)
2042 *pp = p->next;
2043 else
2044 pp = &p->next;
2045 }
2046
2047 if (pc_count || count)
2048 {
2049 h->needs_plt = 1;
2050 h->non_got_ref = 1;
2051 if (h->plt.refcount <= 0)
2052 h->plt.refcount = 1;
2053 else
2054 h->plt.refcount += 1;
2055 }
2056 }
2057
2058 if (h->plt.refcount <= 0)
2059 {
2060 h->plt.offset = (bfd_vma) -1;
2061 h->needs_plt = 0;
2062 }
2063 return TRUE;
2064 }
2065
2066 /* If this is a function, put it in the procedure linkage table. We
2067 will fill in the contents of the procedure linkage table later,
2068 when we know the address of the .got section. */
2069 if (h->type == STT_FUNC
2070 || h->needs_plt)
2071 {
2072 if (h->plt.refcount <= 0
2073 || SYMBOL_CALLS_LOCAL (info, h)
2074 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2075 && h->root.type == bfd_link_hash_undefweak))
2076 {
2077 /* This case can occur if we saw a PLT32 reloc in an input
2078 file, but the symbol was never referred to by a dynamic
2079 object, or if all references were garbage collected. In
2080 such a case, we don't actually need to build a procedure
2081 linkage table, and we can just do a PC32 reloc instead. */
2082 h->plt.offset = (bfd_vma) -1;
2083 h->needs_plt = 0;
2084 }
2085
2086 return TRUE;
2087 }
2088 else
2089 /* It's possible that we incorrectly decided a .plt reloc was
2090 needed for an R_386_PC32 reloc to a non-function sym in
2091 check_relocs. We can't decide accurately between function and
2092 non-function syms in check-relocs; Objects loaded later in
2093 the link may change h->type. So fix it now. */
2094 h->plt.offset = (bfd_vma) -1;
2095
2096 /* If this is a weak symbol, and there is a real definition, the
2097 processor independent code will have arranged for us to see the
2098 real definition first, and we can just use the same value. */
2099 if (h->u.weakdef != NULL)
2100 {
2101 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2102 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2103 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2104 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2105 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2106 h->non_got_ref = h->u.weakdef->non_got_ref;
2107 return TRUE;
2108 }
2109
2110 /* This is a reference to a symbol defined by a dynamic object which
2111 is not a function. */
2112
2113 /* If we are creating a shared library, we must presume that the
2114 only references to the symbol are via the global offset table.
2115 For such cases we need not do anything here; the relocations will
2116 be handled correctly by relocate_section. */
2117 if (info->shared)
2118 return TRUE;
2119
2120 /* If there are no references to this symbol that do not use the
2121 GOT, we don't need to generate a copy reloc. */
2122 if (!h->non_got_ref)
2123 return TRUE;
2124
2125 /* If -z nocopyreloc was given, we won't generate them either. */
2126 if (info->nocopyreloc)
2127 {
2128 h->non_got_ref = 0;
2129 return TRUE;
2130 }
2131
2132 htab = elf_i386_hash_table (info);
2133 if (htab == NULL)
2134 return FALSE;
2135
2136 /* If there aren't any dynamic relocs in read-only sections, then
2137 we can keep the dynamic relocs and avoid the copy reloc. This
2138 doesn't work on VxWorks, where we can not have dynamic relocations
2139 (other than copy and jump slot relocations) in an executable. */
2140 if (ELIMINATE_COPY_RELOCS
2141 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2142 {
2143 eh = (struct elf_i386_link_hash_entry *) h;
2144 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2145 {
2146 s = p->sec->output_section;
2147 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2148 break;
2149 }
2150
2151 if (p == NULL)
2152 {
2153 h->non_got_ref = 0;
2154 return TRUE;
2155 }
2156 }
2157
2158 /* We must allocate the symbol in our .dynbss section, which will
2159 become part of the .bss section of the executable. There will be
2160 an entry for this symbol in the .dynsym section. The dynamic
2161 object will contain position independent code, so all references
2162 from the dynamic object to this symbol will go through the global
2163 offset table. The dynamic linker will use the .dynsym entry to
2164 determine the address it must put in the global offset table, so
2165 both the dynamic object and the regular object will refer to the
2166 same memory location for the variable. */
2167
2168 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2169 copy the initial value out of the dynamic object and into the
2170 runtime process image. */
2171 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2172 {
2173 htab->srelbss->size += sizeof (Elf32_External_Rel);
2174 h->needs_copy = 1;
2175 }
2176
2177 s = htab->sdynbss;
2178
2179 return _bfd_elf_adjust_dynamic_copy (h, s);
2180 }
2181
2182 /* Allocate space in .plt, .got and associated reloc sections for
2183 dynamic relocs. */
2184
2185 static bfd_boolean
2186 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2187 {
2188 struct bfd_link_info *info;
2189 struct elf_i386_link_hash_table *htab;
2190 struct elf_i386_link_hash_entry *eh;
2191 struct elf_dyn_relocs *p;
2192 unsigned plt_entry_size;
2193
2194 if (h->root.type == bfd_link_hash_indirect)
2195 return TRUE;
2196
2197 eh = (struct elf_i386_link_hash_entry *) h;
2198
2199 info = (struct bfd_link_info *) inf;
2200 htab = elf_i386_hash_table (info);
2201 if (htab == NULL)
2202 return FALSE;
2203
2204 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2205
2206 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2207 here if it is defined and referenced in a non-shared object. */
2208 if (h->type == STT_GNU_IFUNC
2209 && h->def_regular)
2210 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2211 plt_entry_size, 4);
2212 else if (htab->elf.dynamic_sections_created
2213 && h->plt.refcount > 0)
2214 {
2215 /* Make sure this symbol is output as a dynamic symbol.
2216 Undefined weak syms won't yet be marked as dynamic. */
2217 if (h->dynindx == -1
2218 && !h->forced_local)
2219 {
2220 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2221 return FALSE;
2222 }
2223
2224 if (info->shared
2225 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2226 {
2227 asection *s = htab->elf.splt;
2228
2229 /* If this is the first .plt entry, make room for the special
2230 first entry. */
2231 if (s->size == 0)
2232 s->size += plt_entry_size;
2233
2234 h->plt.offset = s->size;
2235
2236 /* If this symbol is not defined in a regular file, and we are
2237 not generating a shared library, then set the symbol to this
2238 location in the .plt. This is required to make function
2239 pointers compare as equal between the normal executable and
2240 the shared library. */
2241 if (! info->shared
2242 && !h->def_regular)
2243 {
2244 h->root.u.def.section = s;
2245 h->root.u.def.value = h->plt.offset;
2246 }
2247
2248 /* Make room for this entry. */
2249 s->size += plt_entry_size;
2250
2251 /* We also need to make an entry in the .got.plt section, which
2252 will be placed in the .got section by the linker script. */
2253 htab->elf.sgotplt->size += 4;
2254
2255 /* We also need to make an entry in the .rel.plt section. */
2256 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2257 htab->elf.srelplt->reloc_count++;
2258
2259 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2260 && !info->shared)
2261 {
2262 /* VxWorks has a second set of relocations for each PLT entry
2263 in executables. They go in a separate relocation section,
2264 which is processed by the kernel loader. */
2265
2266 /* There are two relocations for the initial PLT entry: an
2267 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2268 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2269
2270 if (h->plt.offset == plt_entry_size)
2271 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2272
2273 /* There are two extra relocations for each subsequent PLT entry:
2274 an R_386_32 relocation for the GOT entry, and an R_386_32
2275 relocation for the PLT entry. */
2276
2277 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2278 }
2279 }
2280 else
2281 {
2282 h->plt.offset = (bfd_vma) -1;
2283 h->needs_plt = 0;
2284 }
2285 }
2286 else
2287 {
2288 h->plt.offset = (bfd_vma) -1;
2289 h->needs_plt = 0;
2290 }
2291
2292 eh->tlsdesc_got = (bfd_vma) -1;
2293
2294 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2295 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2296 if (h->got.refcount > 0
2297 && info->executable
2298 && h->dynindx == -1
2299 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2300 h->got.offset = (bfd_vma) -1;
2301 else if (h->got.refcount > 0)
2302 {
2303 asection *s;
2304 bfd_boolean dyn;
2305 int tls_type = elf_i386_hash_entry(h)->tls_type;
2306
2307 /* Make sure this symbol is output as a dynamic symbol.
2308 Undefined weak syms won't yet be marked as dynamic. */
2309 if (h->dynindx == -1
2310 && !h->forced_local)
2311 {
2312 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2313 return FALSE;
2314 }
2315
2316 s = htab->elf.sgot;
2317 if (GOT_TLS_GDESC_P (tls_type))
2318 {
2319 eh->tlsdesc_got = htab->elf.sgotplt->size
2320 - elf_i386_compute_jump_table_size (htab);
2321 htab->elf.sgotplt->size += 8;
2322 h->got.offset = (bfd_vma) -2;
2323 }
2324 if (! GOT_TLS_GDESC_P (tls_type)
2325 || GOT_TLS_GD_P (tls_type))
2326 {
2327 h->got.offset = s->size;
2328 s->size += 4;
2329 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2330 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2331 s->size += 4;
2332 }
2333 dyn = htab->elf.dynamic_sections_created;
2334 /* R_386_TLS_IE_32 needs one dynamic relocation,
2335 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2336 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2337 need two), R_386_TLS_GD needs one if local symbol and two if
2338 global. */
2339 if (tls_type == GOT_TLS_IE_BOTH)
2340 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2341 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2342 || (tls_type & GOT_TLS_IE))
2343 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2344 else if (GOT_TLS_GD_P (tls_type))
2345 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2346 else if (! GOT_TLS_GDESC_P (tls_type)
2347 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2348 || h->root.type != bfd_link_hash_undefweak)
2349 && (info->shared
2350 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2351 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2352 if (GOT_TLS_GDESC_P (tls_type))
2353 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2354 }
2355 else
2356 h->got.offset = (bfd_vma) -1;
2357
2358 if (eh->dyn_relocs == NULL)
2359 return TRUE;
2360
2361 /* Since pc_count for TLS symbol can only have size relocations and
2362 we always resolve size relocation against non-zero TLS symbol, we
2363 clear pc_count for non-zero TLS symbol. */
2364 if (h->type == STT_TLS && h->size != 0)
2365 {
2366 struct elf_dyn_relocs **pp;
2367
2368 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2369 {
2370 p->count -= p->pc_count;
2371 p->pc_count = 0;
2372 if (p->count == 0)
2373 *pp = p->next;
2374 else
2375 pp = &p->next;
2376 }
2377 }
2378
2379 /* In the shared -Bsymbolic case, discard space allocated for
2380 dynamic pc-relative relocs against symbols which turn out to be
2381 defined in regular objects. For the normal shared case, discard
2382 space for pc-relative relocs that have become local due to symbol
2383 visibility changes. */
2384
2385 if (info->shared)
2386 {
2387 /* The only reloc that uses pc_count is R_386_PC32, which will
2388 appear on a call or on something like ".long foo - .". We
2389 want calls to protected symbols to resolve directly to the
2390 function rather than going via the plt. If people want
2391 function pointer comparisons to work as expected then they
2392 should avoid writing assembly like ".long foo - .". */
2393 if (SYMBOL_CALLS_LOCAL (info, h))
2394 {
2395 struct elf_dyn_relocs **pp;
2396
2397 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2398 {
2399 p->count -= p->pc_count;
2400 p->pc_count = 0;
2401 if (p->count == 0)
2402 *pp = p->next;
2403 else
2404 pp = &p->next;
2405 }
2406 }
2407
2408 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2409 {
2410 struct elf_dyn_relocs **pp;
2411 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2412 {
2413 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2414 *pp = p->next;
2415 else
2416 pp = &p->next;
2417 }
2418 }
2419
2420 /* Also discard relocs on undefined weak syms with non-default
2421 visibility. */
2422 if (eh->dyn_relocs != NULL
2423 && h->root.type == bfd_link_hash_undefweak)
2424 {
2425 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2426 eh->dyn_relocs = NULL;
2427
2428 /* Make sure undefined weak symbols are output as a dynamic
2429 symbol in PIEs. */
2430 else if (h->dynindx == -1
2431 && !h->forced_local)
2432 {
2433 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2434 return FALSE;
2435 }
2436 }
2437 }
2438 else if (ELIMINATE_COPY_RELOCS)
2439 {
2440 /* For the non-shared case, discard space for relocs against
2441 symbols which turn out to need copy relocs or are not
2442 dynamic. */
2443
2444 if (!h->non_got_ref
2445 && ((h->def_dynamic
2446 && !h->def_regular)
2447 || (htab->elf.dynamic_sections_created
2448 && (h->root.type == bfd_link_hash_undefweak
2449 || h->root.type == bfd_link_hash_undefined))))
2450 {
2451 /* Make sure this symbol is output as a dynamic symbol.
2452 Undefined weak syms won't yet be marked as dynamic. */
2453 if (h->dynindx == -1
2454 && !h->forced_local)
2455 {
2456 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2457 return FALSE;
2458 }
2459
2460 /* If that succeeded, we know we'll be keeping all the
2461 relocs. */
2462 if (h->dynindx != -1)
2463 goto keep;
2464 }
2465
2466 eh->dyn_relocs = NULL;
2467
2468 keep: ;
2469 }
2470
2471 /* Finally, allocate space. */
2472 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2473 {
2474 asection *sreloc;
2475
2476 sreloc = elf_section_data (p->sec)->sreloc;
2477
2478 BFD_ASSERT (sreloc != NULL);
2479 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2480 }
2481
2482 return TRUE;
2483 }
2484
2485 /* Allocate space in .plt, .got and associated reloc sections for
2486 local dynamic relocs. */
2487
2488 static bfd_boolean
2489 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2490 {
2491 struct elf_link_hash_entry *h
2492 = (struct elf_link_hash_entry *) *slot;
2493
2494 if (h->type != STT_GNU_IFUNC
2495 || !h->def_regular
2496 || !h->ref_regular
2497 || !h->forced_local
2498 || h->root.type != bfd_link_hash_defined)
2499 abort ();
2500
2501 return elf_i386_allocate_dynrelocs (h, inf);
2502 }
2503
2504 /* Find any dynamic relocs that apply to read-only sections. */
2505
2506 static bfd_boolean
2507 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2508 {
2509 struct elf_i386_link_hash_entry *eh;
2510 struct elf_dyn_relocs *p;
2511
2512 /* Skip local IFUNC symbols. */
2513 if (h->forced_local && h->type == STT_GNU_IFUNC)
2514 return TRUE;
2515
2516 eh = (struct elf_i386_link_hash_entry *) h;
2517 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2518 {
2519 asection *s = p->sec->output_section;
2520
2521 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2522 {
2523 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2524
2525 info->flags |= DF_TEXTREL;
2526
2527 if (info->warn_shared_textrel && info->shared)
2528 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'.\n"),
2529 p->sec->owner, h->root.root.string,
2530 p->sec);
2531
2532 /* Not an error, just cut short the traversal. */
2533 return FALSE;
2534 }
2535 }
2536 return TRUE;
2537 }
2538
2539 /* Convert
2540 mov foo@GOT(%reg), %reg
2541 to
2542 lea foo@GOTOFF(%reg), %reg
2543 with the local symbol, foo. */
2544
2545 static bfd_boolean
2546 elf_i386_convert_mov_to_lea (bfd *abfd, asection *sec,
2547 struct bfd_link_info *link_info)
2548 {
2549 Elf_Internal_Shdr *symtab_hdr;
2550 Elf_Internal_Rela *internal_relocs;
2551 Elf_Internal_Rela *irel, *irelend;
2552 bfd_byte *contents;
2553 struct elf_i386_link_hash_table *htab;
2554 bfd_boolean changed_contents;
2555 bfd_boolean changed_relocs;
2556 bfd_signed_vma *local_got_refcounts;
2557
2558 /* Don't even try to convert non-ELF outputs. */
2559 if (!is_elf_hash_table (link_info->hash))
2560 return FALSE;
2561
2562 /* Nothing to do if there are no codes, no relocations or no output. */
2563 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2564 || sec->reloc_count == 0
2565 || discarded_section (sec))
2566 return TRUE;
2567
2568 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2569
2570 /* Load the relocations for this section. */
2571 internal_relocs = (_bfd_elf_link_read_relocs
2572 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2573 link_info->keep_memory));
2574 if (internal_relocs == NULL)
2575 return FALSE;
2576
2577 htab = elf_i386_hash_table (link_info);
2578 changed_contents = FALSE;
2579 changed_relocs = FALSE;
2580 local_got_refcounts = elf_local_got_refcounts (abfd);
2581
2582 /* Get the section contents. */
2583 if (elf_section_data (sec)->this_hdr.contents != NULL)
2584 contents = elf_section_data (sec)->this_hdr.contents;
2585 else
2586 {
2587 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2588 goto error_return;
2589 }
2590
2591 irelend = internal_relocs + sec->reloc_count;
2592 for (irel = internal_relocs; irel < irelend; irel++)
2593 {
2594 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2595 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2596 unsigned int indx;
2597 struct elf_link_hash_entry *h;
2598
2599 if (r_type != R_386_GOT32)
2600 continue;
2601
2602 /* Get the symbol referred to by the reloc. */
2603 if (r_symndx < symtab_hdr->sh_info)
2604 {
2605 Elf_Internal_Sym *isym;
2606
2607 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2608 abfd, r_symndx);
2609
2610 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. */
2611 if (ELF_ST_TYPE (isym->st_info) != STT_GNU_IFUNC
2612 && bfd_get_8 (input_bfd,
2613 contents + irel->r_offset - 2) == 0x8b)
2614 {
2615 bfd_put_8 (output_bfd, 0x8d,
2616 contents + irel->r_offset - 2);
2617 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2618 if (local_got_refcounts != NULL
2619 && local_got_refcounts[r_symndx] > 0)
2620 local_got_refcounts[r_symndx] -= 1;
2621 changed_contents = TRUE;
2622 changed_relocs = TRUE;
2623 }
2624 continue;
2625 }
2626
2627 indx = r_symndx - symtab_hdr->sh_info;
2628 h = elf_sym_hashes (abfd)[indx];
2629 BFD_ASSERT (h != NULL);
2630
2631 while (h->root.type == bfd_link_hash_indirect
2632 || h->root.type == bfd_link_hash_warning)
2633 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2634
2635 /* STT_GNU_IFUNC must keep R_386_GOT32 relocation. We also avoid
2636 optimizing _DYNAMIC since ld.so may use its link-time address. */
2637 if (h->def_regular
2638 && h->type != STT_GNU_IFUNC
2639 && h != htab->elf.hdynamic
2640 && SYMBOL_REFERENCES_LOCAL (link_info, h)
2641 && bfd_get_8 (input_bfd,
2642 contents + irel->r_offset - 2) == 0x8b)
2643 {
2644 bfd_put_8 (output_bfd, 0x8d,
2645 contents + irel->r_offset - 2);
2646 irel->r_info = ELF32_R_INFO (r_symndx, R_386_GOTOFF);
2647 if (h->got.refcount > 0)
2648 h->got.refcount -= 1;
2649 changed_contents = TRUE;
2650 changed_relocs = TRUE;
2651 }
2652 }
2653
2654 if (contents != NULL
2655 && elf_section_data (sec)->this_hdr.contents != contents)
2656 {
2657 if (!changed_contents && !link_info->keep_memory)
2658 free (contents);
2659 else
2660 {
2661 /* Cache the section contents for elf_link_input_bfd. */
2662 elf_section_data (sec)->this_hdr.contents = contents;
2663 }
2664 }
2665
2666 if (elf_section_data (sec)->relocs != internal_relocs)
2667 {
2668 if (!changed_relocs)
2669 free (internal_relocs);
2670 else
2671 elf_section_data (sec)->relocs = internal_relocs;
2672 }
2673
2674 return TRUE;
2675
2676 error_return:
2677 if (contents != NULL
2678 && elf_section_data (sec)->this_hdr.contents != contents)
2679 free (contents);
2680 if (internal_relocs != NULL
2681 && elf_section_data (sec)->relocs != internal_relocs)
2682 free (internal_relocs);
2683 return FALSE;
2684 }
2685
2686 /* Set the sizes of the dynamic sections. */
2687
2688 static bfd_boolean
2689 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
2690 {
2691 struct elf_i386_link_hash_table *htab;
2692 bfd *dynobj;
2693 asection *s;
2694 bfd_boolean relocs;
2695 bfd *ibfd;
2696
2697 htab = elf_i386_hash_table (info);
2698 if (htab == NULL)
2699 return FALSE;
2700 dynobj = htab->elf.dynobj;
2701 if (dynobj == NULL)
2702 abort ();
2703
2704 if (htab->elf.dynamic_sections_created)
2705 {
2706 /* Set the contents of the .interp section to the interpreter. */
2707 if (info->executable)
2708 {
2709 s = bfd_get_linker_section (dynobj, ".interp");
2710 if (s == NULL)
2711 abort ();
2712 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
2713 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
2714 }
2715 }
2716
2717 /* Set up .got offsets for local syms, and space for local dynamic
2718 relocs. */
2719 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
2720 {
2721 bfd_signed_vma *local_got;
2722 bfd_signed_vma *end_local_got;
2723 char *local_tls_type;
2724 bfd_vma *local_tlsdesc_gotent;
2725 bfd_size_type locsymcount;
2726 Elf_Internal_Shdr *symtab_hdr;
2727 asection *srel;
2728
2729 if (! is_i386_elf (ibfd))
2730 continue;
2731
2732 for (s = ibfd->sections; s != NULL; s = s->next)
2733 {
2734 struct elf_dyn_relocs *p;
2735
2736 if (!elf_i386_convert_mov_to_lea (ibfd, s, info))
2737 return FALSE;
2738
2739 for (p = ((struct elf_dyn_relocs *)
2740 elf_section_data (s)->local_dynrel);
2741 p != NULL;
2742 p = p->next)
2743 {
2744 if (!bfd_is_abs_section (p->sec)
2745 && bfd_is_abs_section (p->sec->output_section))
2746 {
2747 /* Input section has been discarded, either because
2748 it is a copy of a linkonce section or due to
2749 linker script /DISCARD/, so we'll be discarding
2750 the relocs too. */
2751 }
2752 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
2753 && strcmp (p->sec->output_section->name,
2754 ".tls_vars") == 0)
2755 {
2756 /* Relocations in vxworks .tls_vars sections are
2757 handled specially by the loader. */
2758 }
2759 else if (p->count != 0)
2760 {
2761 srel = elf_section_data (p->sec)->sreloc;
2762 srel->size += p->count * sizeof (Elf32_External_Rel);
2763 if ((p->sec->output_section->flags & SEC_READONLY) != 0
2764 && (info->flags & DF_TEXTREL) == 0)
2765 {
2766 info->flags |= DF_TEXTREL;
2767 if (info->warn_shared_textrel && info->shared)
2768 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'.\n"),
2769 p->sec->owner, p->sec);
2770 }
2771 }
2772 }
2773 }
2774
2775 local_got = elf_local_got_refcounts (ibfd);
2776 if (!local_got)
2777 continue;
2778
2779 symtab_hdr = &elf_symtab_hdr (ibfd);
2780 locsymcount = symtab_hdr->sh_info;
2781 end_local_got = local_got + locsymcount;
2782 local_tls_type = elf_i386_local_got_tls_type (ibfd);
2783 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
2784 s = htab->elf.sgot;
2785 srel = htab->elf.srelgot;
2786 for (; local_got < end_local_got;
2787 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
2788 {
2789 *local_tlsdesc_gotent = (bfd_vma) -1;
2790 if (*local_got > 0)
2791 {
2792 if (GOT_TLS_GDESC_P (*local_tls_type))
2793 {
2794 *local_tlsdesc_gotent = htab->elf.sgotplt->size
2795 - elf_i386_compute_jump_table_size (htab);
2796 htab->elf.sgotplt->size += 8;
2797 *local_got = (bfd_vma) -2;
2798 }
2799 if (! GOT_TLS_GDESC_P (*local_tls_type)
2800 || GOT_TLS_GD_P (*local_tls_type))
2801 {
2802 *local_got = s->size;
2803 s->size += 4;
2804 if (GOT_TLS_GD_P (*local_tls_type)
2805 || *local_tls_type == GOT_TLS_IE_BOTH)
2806 s->size += 4;
2807 }
2808 if (info->shared
2809 || GOT_TLS_GD_ANY_P (*local_tls_type)
2810 || (*local_tls_type & GOT_TLS_IE))
2811 {
2812 if (*local_tls_type == GOT_TLS_IE_BOTH)
2813 srel->size += 2 * sizeof (Elf32_External_Rel);
2814 else if (GOT_TLS_GD_P (*local_tls_type)
2815 || ! GOT_TLS_GDESC_P (*local_tls_type))
2816 srel->size += sizeof (Elf32_External_Rel);
2817 if (GOT_TLS_GDESC_P (*local_tls_type))
2818 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2819 }
2820 }
2821 else
2822 *local_got = (bfd_vma) -1;
2823 }
2824 }
2825
2826 if (htab->tls_ldm_got.refcount > 0)
2827 {
2828 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
2829 relocs. */
2830 htab->tls_ldm_got.offset = htab->elf.sgot->size;
2831 htab->elf.sgot->size += 8;
2832 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2833 }
2834 else
2835 htab->tls_ldm_got.offset = -1;
2836
2837 /* Allocate global sym .plt and .got entries, and space for global
2838 sym dynamic relocs. */
2839 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
2840
2841 /* Allocate .plt and .got entries, and space for local symbols. */
2842 htab_traverse (htab->loc_hash_table,
2843 elf_i386_allocate_local_dynrelocs,
2844 info);
2845
2846 /* For every jump slot reserved in the sgotplt, reloc_count is
2847 incremented. However, when we reserve space for TLS descriptors,
2848 it's not incremented, so in order to compute the space reserved
2849 for them, it suffices to multiply the reloc count by the jump
2850 slot size.
2851
2852 PR ld/13302: We start next_irelative_index at the end of .rela.plt
2853 so that R_386_IRELATIVE entries come last. */
2854 if (htab->elf.srelplt)
2855 {
2856 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
2857 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2858 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
2859 }
2860 else if (htab->elf.irelplt)
2861 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
2862
2863
2864 if (htab->elf.sgotplt)
2865 {
2866 /* Don't allocate .got.plt section if there are no GOT nor PLT
2867 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
2868 if ((htab->elf.hgot == NULL
2869 || !htab->elf.hgot->ref_regular_nonweak)
2870 && (htab->elf.sgotplt->size
2871 == get_elf_backend_data (output_bfd)->got_header_size)
2872 && (htab->elf.splt == NULL
2873 || htab->elf.splt->size == 0)
2874 && (htab->elf.sgot == NULL
2875 || htab->elf.sgot->size == 0)
2876 && (htab->elf.iplt == NULL
2877 || htab->elf.iplt->size == 0)
2878 && (htab->elf.igotplt == NULL
2879 || htab->elf.igotplt->size == 0))
2880 htab->elf.sgotplt->size = 0;
2881 }
2882
2883
2884 if (htab->plt_eh_frame != NULL
2885 && htab->elf.splt != NULL
2886 && htab->elf.splt->size != 0
2887 && !bfd_is_abs_section (htab->elf.splt->output_section)
2888 && _bfd_elf_eh_frame_present (info))
2889 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
2890
2891 /* We now have determined the sizes of the various dynamic sections.
2892 Allocate memory for them. */
2893 relocs = FALSE;
2894 for (s = dynobj->sections; s != NULL; s = s->next)
2895 {
2896 bfd_boolean strip_section = TRUE;
2897
2898 if ((s->flags & SEC_LINKER_CREATED) == 0)
2899 continue;
2900
2901 if (s == htab->elf.splt
2902 || s == htab->elf.sgot)
2903 {
2904 /* Strip this section if we don't need it; see the
2905 comment below. */
2906 /* We'd like to strip these sections if they aren't needed, but if
2907 we've exported dynamic symbols from them we must leave them.
2908 It's too late to tell BFD to get rid of the symbols. */
2909
2910 if (htab->elf.hplt != NULL)
2911 strip_section = FALSE;
2912 }
2913 else if (s == htab->elf.sgotplt
2914 || s == htab->elf.iplt
2915 || s == htab->elf.igotplt
2916 || s == htab->plt_eh_frame
2917 || s == htab->sdynbss)
2918 {
2919 /* Strip these too. */
2920 }
2921 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2922 {
2923 if (s->size != 0
2924 && s != htab->elf.srelplt
2925 && s != htab->srelplt2)
2926 relocs = TRUE;
2927
2928 /* We use the reloc_count field as a counter if we need
2929 to copy relocs into the output file. */
2930 s->reloc_count = 0;
2931 }
2932 else
2933 {
2934 /* It's not one of our sections, so don't allocate space. */
2935 continue;
2936 }
2937
2938 if (s->size == 0)
2939 {
2940 /* If we don't need this section, strip it from the
2941 output file. This is mostly to handle .rel.bss and
2942 .rel.plt. We must create both sections in
2943 create_dynamic_sections, because they must be created
2944 before the linker maps input sections to output
2945 sections. The linker does that before
2946 adjust_dynamic_symbol is called, and it is that
2947 function which decides whether anything needs to go
2948 into these sections. */
2949 if (strip_section)
2950 s->flags |= SEC_EXCLUDE;
2951 continue;
2952 }
2953
2954 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2955 continue;
2956
2957 /* Allocate memory for the section contents. We use bfd_zalloc
2958 here in case unused entries are not reclaimed before the
2959 section's contents are written out. This should not happen,
2960 but this way if it does, we get a R_386_NONE reloc instead
2961 of garbage. */
2962 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
2963 if (s->contents == NULL)
2964 return FALSE;
2965 }
2966
2967 if (htab->plt_eh_frame != NULL
2968 && htab->plt_eh_frame->contents != NULL)
2969 {
2970 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
2971 sizeof (elf_i386_eh_frame_plt));
2972 bfd_put_32 (dynobj, htab->elf.splt->size,
2973 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
2974 }
2975
2976 if (htab->elf.dynamic_sections_created)
2977 {
2978 /* Add some entries to the .dynamic section. We fill in the
2979 values later, in elf_i386_finish_dynamic_sections, but we
2980 must add the entries now so that we get the correct size for
2981 the .dynamic section. The DT_DEBUG entry is filled in by the
2982 dynamic linker and used by the debugger. */
2983 #define add_dynamic_entry(TAG, VAL) \
2984 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2985
2986 if (info->executable)
2987 {
2988 if (!add_dynamic_entry (DT_DEBUG, 0))
2989 return FALSE;
2990 }
2991
2992 if (htab->elf.splt->size != 0)
2993 {
2994 if (!add_dynamic_entry (DT_PLTGOT, 0)
2995 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2996 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2997 || !add_dynamic_entry (DT_JMPREL, 0))
2998 return FALSE;
2999 }
3000
3001 if (relocs)
3002 {
3003 if (!add_dynamic_entry (DT_REL, 0)
3004 || !add_dynamic_entry (DT_RELSZ, 0)
3005 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3006 return FALSE;
3007
3008 /* If any dynamic relocs apply to a read-only section,
3009 then we need a DT_TEXTREL entry. */
3010 if ((info->flags & DF_TEXTREL) == 0)
3011 elf_link_hash_traverse (&htab->elf,
3012 elf_i386_readonly_dynrelocs, info);
3013
3014 if ((info->flags & DF_TEXTREL) != 0)
3015 {
3016 if (!add_dynamic_entry (DT_TEXTREL, 0))
3017 return FALSE;
3018 }
3019 }
3020 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3021 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3022 return FALSE;
3023 }
3024 #undef add_dynamic_entry
3025
3026 return TRUE;
3027 }
3028
3029 static bfd_boolean
3030 elf_i386_always_size_sections (bfd *output_bfd,
3031 struct bfd_link_info *info)
3032 {
3033 asection *tls_sec = elf_hash_table (info)->tls_sec;
3034
3035 if (tls_sec)
3036 {
3037 struct elf_link_hash_entry *tlsbase;
3038
3039 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3040 "_TLS_MODULE_BASE_",
3041 FALSE, FALSE, FALSE);
3042
3043 if (tlsbase && tlsbase->type == STT_TLS)
3044 {
3045 struct elf_i386_link_hash_table *htab;
3046 struct bfd_link_hash_entry *bh = NULL;
3047 const struct elf_backend_data *bed
3048 = get_elf_backend_data (output_bfd);
3049
3050 htab = elf_i386_hash_table (info);
3051 if (htab == NULL)
3052 return FALSE;
3053
3054 if (!(_bfd_generic_link_add_one_symbol
3055 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3056 tls_sec, 0, NULL, FALSE,
3057 bed->collect, &bh)))
3058 return FALSE;
3059
3060 htab->tls_module_base = bh;
3061
3062 tlsbase = (struct elf_link_hash_entry *)bh;
3063 tlsbase->def_regular = 1;
3064 tlsbase->other = STV_HIDDEN;
3065 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3066 }
3067 }
3068
3069 return TRUE;
3070 }
3071
3072 /* Set the correct type for an x86 ELF section. We do this by the
3073 section name, which is a hack, but ought to work. */
3074
3075 static bfd_boolean
3076 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3077 Elf_Internal_Shdr *hdr,
3078 asection *sec)
3079 {
3080 const char *name;
3081
3082 name = bfd_get_section_name (abfd, sec);
3083
3084 /* This is an ugly, but unfortunately necessary hack that is
3085 needed when producing EFI binaries on x86. It tells
3086 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3087 containing ELF relocation info. We need this hack in order to
3088 be able to generate ELF binaries that can be translated into
3089 EFI applications (which are essentially COFF objects). Those
3090 files contain a COFF ".reloc" section inside an ELFNN object,
3091 which would normally cause BFD to segfault because it would
3092 attempt to interpret this section as containing relocation
3093 entries for section "oc". With this hack enabled, ".reloc"
3094 will be treated as a normal data section, which will avoid the
3095 segfault. However, you won't be able to create an ELFNN binary
3096 with a section named "oc" that needs relocations, but that's
3097 the kind of ugly side-effects you get when detecting section
3098 types based on their names... In practice, this limitation is
3099 unlikely to bite. */
3100 if (strcmp (name, ".reloc") == 0)
3101 hdr->sh_type = SHT_PROGBITS;
3102
3103 return TRUE;
3104 }
3105
3106 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3107 executables. Rather than setting it to the beginning of the TLS
3108 section, we have to set it to the end. This function may be called
3109 multiple times, it is idempotent. */
3110
3111 static void
3112 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3113 {
3114 struct elf_i386_link_hash_table *htab;
3115 struct bfd_link_hash_entry *base;
3116
3117 if (!info->executable)
3118 return;
3119
3120 htab = elf_i386_hash_table (info);
3121 if (htab == NULL)
3122 return;
3123
3124 base = htab->tls_module_base;
3125 if (base == NULL)
3126 return;
3127
3128 base->u.def.value = htab->elf.tls_size;
3129 }
3130
3131 /* Return the base VMA address which should be subtracted from real addresses
3132 when resolving @dtpoff relocation.
3133 This is PT_TLS segment p_vaddr. */
3134
3135 static bfd_vma
3136 elf_i386_dtpoff_base (struct bfd_link_info *info)
3137 {
3138 /* If tls_sec is NULL, we should have signalled an error already. */
3139 if (elf_hash_table (info)->tls_sec == NULL)
3140 return 0;
3141 return elf_hash_table (info)->tls_sec->vma;
3142 }
3143
3144 /* Return the relocation value for @tpoff relocation
3145 if STT_TLS virtual address is ADDRESS. */
3146
3147 static bfd_vma
3148 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3149 {
3150 struct elf_link_hash_table *htab = elf_hash_table (info);
3151 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3152 bfd_vma static_tls_size;
3153
3154 /* If tls_sec is NULL, we should have signalled an error already. */
3155 if (htab->tls_sec == NULL)
3156 return 0;
3157
3158 /* Consider special static TLS alignment requirements. */
3159 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3160 return static_tls_size + htab->tls_sec->vma - address;
3161 }
3162
3163 /* Relocate an i386 ELF section. */
3164
3165 static bfd_boolean
3166 elf_i386_relocate_section (bfd *output_bfd,
3167 struct bfd_link_info *info,
3168 bfd *input_bfd,
3169 asection *input_section,
3170 bfd_byte *contents,
3171 Elf_Internal_Rela *relocs,
3172 Elf_Internal_Sym *local_syms,
3173 asection **local_sections)
3174 {
3175 struct elf_i386_link_hash_table *htab;
3176 Elf_Internal_Shdr *symtab_hdr;
3177 struct elf_link_hash_entry **sym_hashes;
3178 bfd_vma *local_got_offsets;
3179 bfd_vma *local_tlsdesc_gotents;
3180 Elf_Internal_Rela *rel;
3181 Elf_Internal_Rela *relend;
3182 bfd_boolean is_vxworks_tls;
3183 unsigned plt_entry_size;
3184
3185 BFD_ASSERT (is_i386_elf (input_bfd));
3186
3187 htab = elf_i386_hash_table (info);
3188 if (htab == NULL)
3189 return FALSE;
3190 symtab_hdr = &elf_symtab_hdr (input_bfd);
3191 sym_hashes = elf_sym_hashes (input_bfd);
3192 local_got_offsets = elf_local_got_offsets (input_bfd);
3193 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3194 /* We have to handle relocations in vxworks .tls_vars sections
3195 specially, because the dynamic loader is 'weird'. */
3196 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3197 && info->shared
3198 && !strcmp (input_section->output_section->name,
3199 ".tls_vars"));
3200
3201 elf_i386_set_tls_module_base (info);
3202
3203 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3204
3205 rel = relocs;
3206 relend = relocs + input_section->reloc_count;
3207 for (; rel < relend; rel++)
3208 {
3209 unsigned int r_type;
3210 reloc_howto_type *howto;
3211 unsigned long r_symndx;
3212 struct elf_link_hash_entry *h;
3213 Elf_Internal_Sym *sym;
3214 asection *sec;
3215 bfd_vma off, offplt;
3216 bfd_vma relocation;
3217 bfd_boolean unresolved_reloc;
3218 bfd_reloc_status_type r;
3219 unsigned int indx;
3220 int tls_type;
3221 bfd_vma st_size;
3222
3223 r_type = ELF32_R_TYPE (rel->r_info);
3224 if (r_type == R_386_GNU_VTINHERIT
3225 || r_type == R_386_GNU_VTENTRY)
3226 continue;
3227
3228 if ((indx = r_type) >= R_386_standard
3229 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3230 >= R_386_ext - R_386_standard)
3231 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3232 >= R_386_irelative - R_386_ext))
3233 {
3234 (*_bfd_error_handler)
3235 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3236 input_bfd, input_section, r_type);
3237 bfd_set_error (bfd_error_bad_value);
3238 return FALSE;
3239 }
3240 howto = elf_howto_table + indx;
3241
3242 r_symndx = ELF32_R_SYM (rel->r_info);
3243 h = NULL;
3244 sym = NULL;
3245 sec = NULL;
3246 unresolved_reloc = FALSE;
3247 if (r_symndx < symtab_hdr->sh_info)
3248 {
3249 sym = local_syms + r_symndx;
3250 sec = local_sections[r_symndx];
3251 relocation = (sec->output_section->vma
3252 + sec->output_offset
3253 + sym->st_value);
3254 st_size = sym->st_size;
3255
3256 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3257 && ((sec->flags & SEC_MERGE) != 0
3258 || (info->relocatable
3259 && sec->output_offset != 0)))
3260 {
3261 bfd_vma addend;
3262 bfd_byte *where = contents + rel->r_offset;
3263
3264 switch (howto->size)
3265 {
3266 case 0:
3267 addend = bfd_get_8 (input_bfd, where);
3268 if (howto->pc_relative)
3269 {
3270 addend = (addend ^ 0x80) - 0x80;
3271 addend += 1;
3272 }
3273 break;
3274 case 1:
3275 addend = bfd_get_16 (input_bfd, where);
3276 if (howto->pc_relative)
3277 {
3278 addend = (addend ^ 0x8000) - 0x8000;
3279 addend += 2;
3280 }
3281 break;
3282 case 2:
3283 addend = bfd_get_32 (input_bfd, where);
3284 if (howto->pc_relative)
3285 {
3286 addend = (addend ^ 0x80000000) - 0x80000000;
3287 addend += 4;
3288 }
3289 break;
3290 default:
3291 abort ();
3292 }
3293
3294 if (info->relocatable)
3295 addend += sec->output_offset;
3296 else
3297 {
3298 asection *msec = sec;
3299 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3300 addend);
3301 addend -= relocation;
3302 addend += msec->output_section->vma + msec->output_offset;
3303 }
3304
3305 switch (howto->size)
3306 {
3307 case 0:
3308 /* FIXME: overflow checks. */
3309 if (howto->pc_relative)
3310 addend -= 1;
3311 bfd_put_8 (input_bfd, addend, where);
3312 break;
3313 case 1:
3314 if (howto->pc_relative)
3315 addend -= 2;
3316 bfd_put_16 (input_bfd, addend, where);
3317 break;
3318 case 2:
3319 if (howto->pc_relative)
3320 addend -= 4;
3321 bfd_put_32 (input_bfd, addend, where);
3322 break;
3323 }
3324 }
3325 else if (!info->relocatable
3326 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3327 {
3328 /* Relocate against local STT_GNU_IFUNC symbol. */
3329 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3330 FALSE);
3331 if (h == NULL)
3332 abort ();
3333
3334 /* Set STT_GNU_IFUNC symbol value. */
3335 h->root.u.def.value = sym->st_value;
3336 h->root.u.def.section = sec;
3337 }
3338 }
3339 else
3340 {
3341 bfd_boolean warned ATTRIBUTE_UNUSED;
3342
3343 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3344 r_symndx, symtab_hdr, sym_hashes,
3345 h, sec, relocation,
3346 unresolved_reloc, warned);
3347 st_size = h->size;
3348 }
3349
3350 if (sec != NULL && discarded_section (sec))
3351 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3352 rel, 1, relend, howto, 0, contents);
3353
3354 if (info->relocatable)
3355 continue;
3356
3357 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3358 it here if it is defined in a non-shared object. */
3359 if (h != NULL
3360 && h->type == STT_GNU_IFUNC
3361 && h->def_regular)
3362 {
3363 asection *plt, *gotplt, *base_got;
3364 bfd_vma plt_index;
3365 const char *name;
3366
3367 if ((input_section->flags & SEC_ALLOC) == 0
3368 || h->plt.offset == (bfd_vma) -1)
3369 abort ();
3370
3371 /* STT_GNU_IFUNC symbol must go through PLT. */
3372 if (htab->elf.splt != NULL)
3373 {
3374 plt = htab->elf.splt;
3375 gotplt = htab->elf.sgotplt;
3376 }
3377 else
3378 {
3379 plt = htab->elf.iplt;
3380 gotplt = htab->elf.igotplt;
3381 }
3382
3383 relocation = (plt->output_section->vma
3384 + plt->output_offset + h->plt.offset);
3385
3386 switch (r_type)
3387 {
3388 default:
3389 if (h->root.root.string)
3390 name = h->root.root.string;
3391 else
3392 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3393 NULL);
3394 (*_bfd_error_handler)
3395 (_("%B: relocation %s against STT_GNU_IFUNC "
3396 "symbol `%s' isn't handled by %s"), input_bfd,
3397 elf_howto_table[r_type].name,
3398 name, __FUNCTION__);
3399 bfd_set_error (bfd_error_bad_value);
3400 return FALSE;
3401
3402 case R_386_32:
3403 /* Generate dynamic relcoation only when there is a
3404 non-GOT reference in a shared object. */
3405 if (info->shared && h->non_got_ref)
3406 {
3407 Elf_Internal_Rela outrel;
3408 asection *sreloc;
3409 bfd_vma offset;
3410
3411 /* Need a dynamic relocation to get the real function
3412 adddress. */
3413 offset = _bfd_elf_section_offset (output_bfd,
3414 info,
3415 input_section,
3416 rel->r_offset);
3417 if (offset == (bfd_vma) -1
3418 || offset == (bfd_vma) -2)
3419 abort ();
3420
3421 outrel.r_offset = (input_section->output_section->vma
3422 + input_section->output_offset
3423 + offset);
3424
3425 if (h->dynindx == -1
3426 || h->forced_local
3427 || info->executable)
3428 {
3429 /* This symbol is resolved locally. */
3430 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3431 bfd_put_32 (output_bfd,
3432 (h->root.u.def.value
3433 + h->root.u.def.section->output_section->vma
3434 + h->root.u.def.section->output_offset),
3435 contents + offset);
3436 }
3437 else
3438 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3439
3440 sreloc = htab->elf.irelifunc;
3441 elf_append_rel (output_bfd, sreloc, &outrel);
3442
3443 /* If this reloc is against an external symbol, we
3444 do not want to fiddle with the addend. Otherwise,
3445 we need to include the symbol value so that it
3446 becomes an addend for the dynamic reloc. For an
3447 internal symbol, we have updated addend. */
3448 continue;
3449 }
3450 /* FALLTHROUGH */
3451 case R_386_PC32:
3452 case R_386_PLT32:
3453 goto do_relocation;
3454
3455 case R_386_GOT32:
3456 base_got = htab->elf.sgot;
3457 off = h->got.offset;
3458
3459 if (base_got == NULL)
3460 abort ();
3461
3462 if (off == (bfd_vma) -1)
3463 {
3464 /* We can't use h->got.offset here to save state, or
3465 even just remember the offset, as finish_dynamic_symbol
3466 would use that as offset into .got. */
3467
3468 if (htab->elf.splt != NULL)
3469 {
3470 plt_index = h->plt.offset / plt_entry_size - 1;
3471 off = (plt_index + 3) * 4;
3472 base_got = htab->elf.sgotplt;
3473 }
3474 else
3475 {
3476 plt_index = h->plt.offset / plt_entry_size;
3477 off = plt_index * 4;
3478 base_got = htab->elf.igotplt;
3479 }
3480
3481 if (h->dynindx == -1
3482 || h->forced_local
3483 || info->symbolic)
3484 {
3485 /* This references the local defitionion. We must
3486 initialize this entry in the global offset table.
3487 Since the offset must always be a multiple of 8,
3488 we use the least significant bit to record
3489 whether we have initialized it already.
3490
3491 When doing a dynamic link, we create a .rela.got
3492 relocation entry to initialize the value. This
3493 is done in the finish_dynamic_symbol routine. */
3494 if ((off & 1) != 0)
3495 off &= ~1;
3496 else
3497 {
3498 bfd_put_32 (output_bfd, relocation,
3499 base_got->contents + off);
3500 h->got.offset |= 1;
3501 }
3502 }
3503
3504 relocation = off;
3505
3506 /* Adjust for static executables. */
3507 if (htab->elf.splt == NULL)
3508 relocation += gotplt->output_offset;
3509 }
3510 else
3511 {
3512 relocation = (base_got->output_section->vma
3513 + base_got->output_offset + off
3514 - gotplt->output_section->vma
3515 - gotplt->output_offset);
3516 /* Adjust for static executables. */
3517 if (htab->elf.splt == NULL)
3518 relocation += gotplt->output_offset;
3519 }
3520
3521 goto do_relocation;
3522
3523 case R_386_GOTOFF:
3524 relocation -= (gotplt->output_section->vma
3525 + gotplt->output_offset);
3526 goto do_relocation;
3527 }
3528 }
3529
3530 switch (r_type)
3531 {
3532 case R_386_GOT32:
3533 /* Relocation is to the entry for this symbol in the global
3534 offset table. */
3535 if (htab->elf.sgot == NULL)
3536 abort ();
3537
3538 if (h != NULL)
3539 {
3540 bfd_boolean dyn;
3541
3542 off = h->got.offset;
3543 dyn = htab->elf.dynamic_sections_created;
3544 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
3545 || (info->shared
3546 && SYMBOL_REFERENCES_LOCAL (info, h))
3547 || (ELF_ST_VISIBILITY (h->other)
3548 && h->root.type == bfd_link_hash_undefweak))
3549 {
3550 /* This is actually a static link, or it is a
3551 -Bsymbolic link and the symbol is defined
3552 locally, or the symbol was forced to be local
3553 because of a version file. We must initialize
3554 this entry in the global offset table. Since the
3555 offset must always be a multiple of 4, we use the
3556 least significant bit to record whether we have
3557 initialized it already.
3558
3559 When doing a dynamic link, we create a .rel.got
3560 relocation entry to initialize the value. This
3561 is done in the finish_dynamic_symbol routine. */
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 h->got.offset |= 1;
3569 }
3570 }
3571 else
3572 unresolved_reloc = FALSE;
3573 }
3574 else
3575 {
3576 if (local_got_offsets == NULL)
3577 abort ();
3578
3579 off = local_got_offsets[r_symndx];
3580
3581 /* The offset must always be a multiple of 4. We use
3582 the least significant bit to record whether we have
3583 already generated the necessary reloc. */
3584 if ((off & 1) != 0)
3585 off &= ~1;
3586 else
3587 {
3588 bfd_put_32 (output_bfd, relocation,
3589 htab->elf.sgot->contents + off);
3590
3591 if (info->shared)
3592 {
3593 asection *s;
3594 Elf_Internal_Rela outrel;
3595
3596 s = htab->elf.srelgot;
3597 if (s == NULL)
3598 abort ();
3599
3600 outrel.r_offset = (htab->elf.sgot->output_section->vma
3601 + htab->elf.sgot->output_offset
3602 + off);
3603 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3604 elf_append_rel (output_bfd, s, &outrel);
3605 }
3606
3607 local_got_offsets[r_symndx] |= 1;
3608 }
3609 }
3610
3611 if (off >= (bfd_vma) -2)
3612 abort ();
3613
3614 relocation = htab->elf.sgot->output_section->vma
3615 + htab->elf.sgot->output_offset + off
3616 - htab->elf.sgotplt->output_section->vma
3617 - htab->elf.sgotplt->output_offset;
3618 break;
3619
3620 case R_386_GOTOFF:
3621 /* Relocation is relative to the start of the global offset
3622 table. */
3623
3624 /* Check to make sure it isn't a protected function symbol
3625 for shared library since it may not be local when used
3626 as function address. We also need to make sure that a
3627 symbol is defined locally. */
3628 if (info->shared && h)
3629 {
3630 if (!h->def_regular)
3631 {
3632 const char *v;
3633
3634 switch (ELF_ST_VISIBILITY (h->other))
3635 {
3636 case STV_HIDDEN:
3637 v = _("hidden symbol");
3638 break;
3639 case STV_INTERNAL:
3640 v = _("internal symbol");
3641 break;
3642 case STV_PROTECTED:
3643 v = _("protected symbol");
3644 break;
3645 default:
3646 v = _("symbol");
3647 break;
3648 }
3649
3650 (*_bfd_error_handler)
3651 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
3652 input_bfd, v, h->root.root.string);
3653 bfd_set_error (bfd_error_bad_value);
3654 return FALSE;
3655 }
3656 else if (!info->executable
3657 && !SYMBOLIC_BIND (info, h)
3658 && h->type == STT_FUNC
3659 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
3660 {
3661 (*_bfd_error_handler)
3662 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
3663 input_bfd, h->root.root.string);
3664 bfd_set_error (bfd_error_bad_value);
3665 return FALSE;
3666 }
3667 }
3668
3669 /* Note that sgot is not involved in this
3670 calculation. We always want the start of .got.plt. If we
3671 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3672 permitted by the ABI, we might have to change this
3673 calculation. */
3674 relocation -= htab->elf.sgotplt->output_section->vma
3675 + htab->elf.sgotplt->output_offset;
3676 break;
3677
3678 case R_386_GOTPC:
3679 /* Use global offset table as symbol value. */
3680 relocation = htab->elf.sgotplt->output_section->vma
3681 + htab->elf.sgotplt->output_offset;
3682 unresolved_reloc = FALSE;
3683 break;
3684
3685 case R_386_PLT32:
3686 /* Relocation is to the entry for this symbol in the
3687 procedure linkage table. */
3688
3689 /* Resolve a PLT32 reloc against a local symbol directly,
3690 without using the procedure linkage table. */
3691 if (h == NULL)
3692 break;
3693
3694 if (h->plt.offset == (bfd_vma) -1
3695 || htab->elf.splt == NULL)
3696 {
3697 /* We didn't make a PLT entry for this symbol. This
3698 happens when statically linking PIC code, or when
3699 using -Bsymbolic. */
3700 break;
3701 }
3702
3703 relocation = (htab->elf.splt->output_section->vma
3704 + htab->elf.splt->output_offset
3705 + h->plt.offset);
3706 unresolved_reloc = FALSE;
3707 break;
3708
3709 case R_386_SIZE32:
3710 /* Set to symbol size. */
3711 relocation = st_size;
3712 if (h && h->type == STT_TLS && st_size != 0)
3713 {
3714 /* Resolve size relocation against non-zero TLS symbol. */
3715 unresolved_reloc = FALSE;
3716 break;
3717 }
3718 /* Fall through. */
3719
3720 case R_386_32:
3721 case R_386_PC32:
3722 if ((input_section->flags & SEC_ALLOC) == 0
3723 || is_vxworks_tls)
3724 break;
3725
3726 if ((info->shared
3727 && (h == NULL
3728 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
3729 || h->root.type != bfd_link_hash_undefweak)
3730 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
3731 || !SYMBOL_CALLS_LOCAL (info, h)))
3732 || (ELIMINATE_COPY_RELOCS
3733 && !info->shared
3734 && h != NULL
3735 && h->dynindx != -1
3736 && !h->non_got_ref
3737 && ((h->def_dynamic
3738 && !h->def_regular)
3739 || h->root.type == bfd_link_hash_undefweak
3740 || h->root.type == bfd_link_hash_undefined)))
3741 {
3742 Elf_Internal_Rela outrel;
3743 bfd_boolean skip, relocate;
3744 asection *sreloc;
3745
3746 /* When generating a shared object, these relocations
3747 are copied into the output file to be resolved at run
3748 time. */
3749
3750 skip = FALSE;
3751 relocate = FALSE;
3752
3753 outrel.r_offset =
3754 _bfd_elf_section_offset (output_bfd, info, input_section,
3755 rel->r_offset);
3756 if (outrel.r_offset == (bfd_vma) -1)
3757 skip = TRUE;
3758 else if (outrel.r_offset == (bfd_vma) -2)
3759 skip = TRUE, relocate = TRUE;
3760 outrel.r_offset += (input_section->output_section->vma
3761 + input_section->output_offset);
3762
3763 if (skip)
3764 memset (&outrel, 0, sizeof outrel);
3765 else if (h != NULL
3766 && h->dynindx != -1
3767 && (r_type == R_386_PC32
3768 || !info->shared
3769 || !SYMBOLIC_BIND (info, h)
3770 || !h->def_regular))
3771 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3772 else
3773 {
3774 /* This symbol is local, or marked to become local. */
3775 relocate = TRUE;
3776 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3777 }
3778
3779 sreloc = elf_section_data (input_section)->sreloc;
3780
3781 if (sreloc == NULL || sreloc->contents == NULL)
3782 {
3783 r = bfd_reloc_notsupported;
3784 goto check_relocation_error;
3785 }
3786
3787 elf_append_rel (output_bfd, sreloc, &outrel);
3788
3789 /* If this reloc is against an external symbol, we do
3790 not want to fiddle with the addend. Otherwise, we
3791 need to include the symbol value so that it becomes
3792 an addend for the dynamic reloc. */
3793 if (! relocate)
3794 continue;
3795 }
3796 break;
3797
3798 case R_386_TLS_IE:
3799 if (!info->executable)
3800 {
3801 Elf_Internal_Rela outrel;
3802 asection *sreloc;
3803
3804 outrel.r_offset = rel->r_offset
3805 + input_section->output_section->vma
3806 + input_section->output_offset;
3807 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3808 sreloc = elf_section_data (input_section)->sreloc;
3809 if (sreloc == NULL)
3810 abort ();
3811 elf_append_rel (output_bfd, sreloc, &outrel);
3812 }
3813 /* Fall through */
3814
3815 case R_386_TLS_GD:
3816 case R_386_TLS_GOTDESC:
3817 case R_386_TLS_DESC_CALL:
3818 case R_386_TLS_IE_32:
3819 case R_386_TLS_GOTIE:
3820 tls_type = GOT_UNKNOWN;
3821 if (h == NULL && local_got_offsets)
3822 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
3823 else if (h != NULL)
3824 tls_type = elf_i386_hash_entry(h)->tls_type;
3825 if (tls_type == GOT_TLS_IE)
3826 tls_type = GOT_TLS_IE_NEG;
3827
3828 if (! elf_i386_tls_transition (info, input_bfd,
3829 input_section, contents,
3830 symtab_hdr, sym_hashes,
3831 &r_type, tls_type, rel,
3832 relend, h, r_symndx))
3833 return FALSE;
3834
3835 if (r_type == R_386_TLS_LE_32)
3836 {
3837 BFD_ASSERT (! unresolved_reloc);
3838 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3839 {
3840 unsigned int type;
3841 bfd_vma roff;
3842
3843 /* GD->LE transition. */
3844 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3845 if (type == 0x04)
3846 {
3847 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3848 Change it into:
3849 movl %gs:0, %eax; subl $foo@tpoff, %eax
3850 (6 byte form of subl). */
3851 memcpy (contents + rel->r_offset - 3,
3852 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3853 roff = rel->r_offset + 5;
3854 }
3855 else
3856 {
3857 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3858 Change it into:
3859 movl %gs:0, %eax; subl $foo@tpoff, %eax
3860 (6 byte form of subl). */
3861 memcpy (contents + rel->r_offset - 2,
3862 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
3863 roff = rel->r_offset + 6;
3864 }
3865 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3866 contents + roff);
3867 /* Skip R_386_PC32/R_386_PLT32. */
3868 rel++;
3869 continue;
3870 }
3871 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3872 {
3873 /* GDesc -> LE transition.
3874 It's originally something like:
3875 leal x@tlsdesc(%ebx), %eax
3876
3877 leal x@ntpoff, %eax
3878
3879 Registers other than %eax may be set up here. */
3880
3881 unsigned int val;
3882 bfd_vma roff;
3883
3884 roff = rel->r_offset;
3885 val = bfd_get_8 (input_bfd, contents + roff - 1);
3886
3887 /* Now modify the instruction as appropriate. */
3888 /* aoliva FIXME: remove the above and xor the byte
3889 below with 0x86. */
3890 bfd_put_8 (output_bfd, val ^ 0x86,
3891 contents + roff - 1);
3892 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3893 contents + roff);
3894 continue;
3895 }
3896 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3897 {
3898 /* GDesc -> LE transition.
3899 It's originally:
3900 call *(%eax)
3901 Turn it into:
3902 xchg %ax,%ax */
3903
3904 bfd_vma roff;
3905
3906 roff = rel->r_offset;
3907 bfd_put_8 (output_bfd, 0x66, contents + roff);
3908 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3909 continue;
3910 }
3911 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
3912 {
3913 unsigned int val;
3914
3915 /* IE->LE transition:
3916 Originally it can be one of:
3917 movl foo, %eax
3918 movl foo, %reg
3919 addl foo, %reg
3920 We change it into:
3921 movl $foo, %eax
3922 movl $foo, %reg
3923 addl $foo, %reg. */
3924 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3925 if (val == 0xa1)
3926 {
3927 /* movl foo, %eax. */
3928 bfd_put_8 (output_bfd, 0xb8,
3929 contents + rel->r_offset - 1);
3930 }
3931 else
3932 {
3933 unsigned int type;
3934
3935 type = bfd_get_8 (input_bfd,
3936 contents + rel->r_offset - 2);
3937 switch (type)
3938 {
3939 case 0x8b:
3940 /* movl */
3941 bfd_put_8 (output_bfd, 0xc7,
3942 contents + rel->r_offset - 2);
3943 bfd_put_8 (output_bfd,
3944 0xc0 | ((val >> 3) & 7),
3945 contents + rel->r_offset - 1);
3946 break;
3947 case 0x03:
3948 /* addl */
3949 bfd_put_8 (output_bfd, 0x81,
3950 contents + rel->r_offset - 2);
3951 bfd_put_8 (output_bfd,
3952 0xc0 | ((val >> 3) & 7),
3953 contents + rel->r_offset - 1);
3954 break;
3955 default:
3956 BFD_FAIL ();
3957 break;
3958 }
3959 }
3960 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3961 contents + rel->r_offset);
3962 continue;
3963 }
3964 else
3965 {
3966 unsigned int val, type;
3967
3968 /* {IE_32,GOTIE}->LE transition:
3969 Originally it can be one of:
3970 subl foo(%reg1), %reg2
3971 movl foo(%reg1), %reg2
3972 addl foo(%reg1), %reg2
3973 We change it into:
3974 subl $foo, %reg2
3975 movl $foo, %reg2 (6 byte form)
3976 addl $foo, %reg2. */
3977 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3978 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3979 if (type == 0x8b)
3980 {
3981 /* movl */
3982 bfd_put_8 (output_bfd, 0xc7,
3983 contents + rel->r_offset - 2);
3984 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3985 contents + rel->r_offset - 1);
3986 }
3987 else if (type == 0x2b)
3988 {
3989 /* subl */
3990 bfd_put_8 (output_bfd, 0x81,
3991 contents + rel->r_offset - 2);
3992 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3993 contents + rel->r_offset - 1);
3994 }
3995 else if (type == 0x03)
3996 {
3997 /* addl */
3998 bfd_put_8 (output_bfd, 0x81,
3999 contents + rel->r_offset - 2);
4000 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4001 contents + rel->r_offset - 1);
4002 }
4003 else
4004 BFD_FAIL ();
4005 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4006 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4007 contents + rel->r_offset);
4008 else
4009 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4010 contents + rel->r_offset);
4011 continue;
4012 }
4013 }
4014
4015 if (htab->elf.sgot == NULL)
4016 abort ();
4017
4018 if (h != NULL)
4019 {
4020 off = h->got.offset;
4021 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4022 }
4023 else
4024 {
4025 if (local_got_offsets == NULL)
4026 abort ();
4027
4028 off = local_got_offsets[r_symndx];
4029 offplt = local_tlsdesc_gotents[r_symndx];
4030 }
4031
4032 if ((off & 1) != 0)
4033 off &= ~1;
4034 else
4035 {
4036 Elf_Internal_Rela outrel;
4037 int dr_type;
4038 asection *sreloc;
4039
4040 if (htab->elf.srelgot == NULL)
4041 abort ();
4042
4043 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4044
4045 if (GOT_TLS_GDESC_P (tls_type))
4046 {
4047 bfd_byte *loc;
4048 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4049 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4050 <= htab->elf.sgotplt->size);
4051 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4052 + htab->elf.sgotplt->output_offset
4053 + offplt
4054 + htab->sgotplt_jump_table_size);
4055 sreloc = htab->elf.srelplt;
4056 loc = sreloc->contents;
4057 loc += (htab->next_tls_desc_index++
4058 * sizeof (Elf32_External_Rel));
4059 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4060 <= sreloc->contents + sreloc->size);
4061 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4062 if (indx == 0)
4063 {
4064 BFD_ASSERT (! unresolved_reloc);
4065 bfd_put_32 (output_bfd,
4066 relocation - elf_i386_dtpoff_base (info),
4067 htab->elf.sgotplt->contents + offplt
4068 + htab->sgotplt_jump_table_size + 4);
4069 }
4070 else
4071 {
4072 bfd_put_32 (output_bfd, 0,
4073 htab->elf.sgotplt->contents + offplt
4074 + htab->sgotplt_jump_table_size + 4);
4075 }
4076 }
4077
4078 sreloc = htab->elf.srelgot;
4079
4080 outrel.r_offset = (htab->elf.sgot->output_section->vma
4081 + htab->elf.sgot->output_offset + off);
4082
4083 if (GOT_TLS_GD_P (tls_type))
4084 dr_type = R_386_TLS_DTPMOD32;
4085 else if (GOT_TLS_GDESC_P (tls_type))
4086 goto dr_done;
4087 else if (tls_type == GOT_TLS_IE_POS)
4088 dr_type = R_386_TLS_TPOFF;
4089 else
4090 dr_type = R_386_TLS_TPOFF32;
4091
4092 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4093 bfd_put_32 (output_bfd,
4094 relocation - elf_i386_dtpoff_base (info),
4095 htab->elf.sgot->contents + off);
4096 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4097 bfd_put_32 (output_bfd,
4098 elf_i386_dtpoff_base (info) - relocation,
4099 htab->elf.sgot->contents + off);
4100 else if (dr_type != R_386_TLS_DESC)
4101 bfd_put_32 (output_bfd, 0,
4102 htab->elf.sgot->contents + off);
4103 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4104
4105 elf_append_rel (output_bfd, sreloc, &outrel);
4106
4107 if (GOT_TLS_GD_P (tls_type))
4108 {
4109 if (indx == 0)
4110 {
4111 BFD_ASSERT (! unresolved_reloc);
4112 bfd_put_32 (output_bfd,
4113 relocation - elf_i386_dtpoff_base (info),
4114 htab->elf.sgot->contents + off + 4);
4115 }
4116 else
4117 {
4118 bfd_put_32 (output_bfd, 0,
4119 htab->elf.sgot->contents + off + 4);
4120 outrel.r_info = ELF32_R_INFO (indx,
4121 R_386_TLS_DTPOFF32);
4122 outrel.r_offset += 4;
4123 elf_append_rel (output_bfd, sreloc, &outrel);
4124 }
4125 }
4126 else if (tls_type == GOT_TLS_IE_BOTH)
4127 {
4128 bfd_put_32 (output_bfd,
4129 (indx == 0
4130 ? relocation - elf_i386_dtpoff_base (info)
4131 : 0),
4132 htab->elf.sgot->contents + off + 4);
4133 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4134 outrel.r_offset += 4;
4135 elf_append_rel (output_bfd, sreloc, &outrel);
4136 }
4137
4138 dr_done:
4139 if (h != NULL)
4140 h->got.offset |= 1;
4141 else
4142 local_got_offsets[r_symndx] |= 1;
4143 }
4144
4145 if (off >= (bfd_vma) -2
4146 && ! GOT_TLS_GDESC_P (tls_type))
4147 abort ();
4148 if (r_type == R_386_TLS_GOTDESC
4149 || r_type == R_386_TLS_DESC_CALL)
4150 {
4151 relocation = htab->sgotplt_jump_table_size + offplt;
4152 unresolved_reloc = FALSE;
4153 }
4154 else if (r_type == ELF32_R_TYPE (rel->r_info))
4155 {
4156 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4157 + htab->elf.sgotplt->output_offset;
4158 relocation = htab->elf.sgot->output_section->vma
4159 + htab->elf.sgot->output_offset + off - g_o_t;
4160 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4161 && tls_type == GOT_TLS_IE_BOTH)
4162 relocation += 4;
4163 if (r_type == R_386_TLS_IE)
4164 relocation += g_o_t;
4165 unresolved_reloc = FALSE;
4166 }
4167 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4168 {
4169 unsigned int val, type;
4170 bfd_vma roff;
4171
4172 /* GD->IE transition. */
4173 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4174 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4175 if (type == 0x04)
4176 {
4177 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4178 Change it into:
4179 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4180 val >>= 3;
4181 roff = rel->r_offset - 3;
4182 }
4183 else
4184 {
4185 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4186 Change it into:
4187 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4188 roff = rel->r_offset - 2;
4189 }
4190 memcpy (contents + roff,
4191 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4192 contents[roff + 7] = 0x80 | (val & 7);
4193 /* If foo is used only with foo@gotntpoff(%reg) and
4194 foo@indntpoff, but not with foo@gottpoff(%reg), change
4195 subl $foo@gottpoff(%reg), %eax
4196 into:
4197 addl $foo@gotntpoff(%reg), %eax. */
4198 if (tls_type == GOT_TLS_IE_POS)
4199 contents[roff + 6] = 0x03;
4200 bfd_put_32 (output_bfd,
4201 htab->elf.sgot->output_section->vma
4202 + htab->elf.sgot->output_offset + off
4203 - htab->elf.sgotplt->output_section->vma
4204 - htab->elf.sgotplt->output_offset,
4205 contents + roff + 8);
4206 /* Skip R_386_PLT32. */
4207 rel++;
4208 continue;
4209 }
4210 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4211 {
4212 /* GDesc -> IE transition.
4213 It's originally something like:
4214 leal x@tlsdesc(%ebx), %eax
4215
4216 Change it to:
4217 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4218 or:
4219 movl x@gottpoff(%ebx), %eax # before negl %eax
4220
4221 Registers other than %eax may be set up here. */
4222
4223 bfd_vma roff;
4224
4225 /* First, make sure it's a leal adding ebx to a 32-bit
4226 offset into any register, although it's probably
4227 almost always going to be eax. */
4228 roff = rel->r_offset;
4229
4230 /* Now modify the instruction as appropriate. */
4231 /* To turn a leal into a movl in the form we use it, it
4232 suffices to change the first byte from 0x8d to 0x8b.
4233 aoliva FIXME: should we decide to keep the leal, all
4234 we have to do is remove the statement below, and
4235 adjust the relaxation of R_386_TLS_DESC_CALL. */
4236 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4237
4238 if (tls_type == GOT_TLS_IE_BOTH)
4239 off += 4;
4240
4241 bfd_put_32 (output_bfd,
4242 htab->elf.sgot->output_section->vma
4243 + htab->elf.sgot->output_offset + off
4244 - htab->elf.sgotplt->output_section->vma
4245 - htab->elf.sgotplt->output_offset,
4246 contents + roff);
4247 continue;
4248 }
4249 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4250 {
4251 /* GDesc -> IE transition.
4252 It's originally:
4253 call *(%eax)
4254
4255 Change it to:
4256 xchg %ax,%ax
4257 or
4258 negl %eax
4259 depending on how we transformed the TLS_GOTDESC above.
4260 */
4261
4262 bfd_vma roff;
4263
4264 roff = rel->r_offset;
4265
4266 /* Now modify the instruction as appropriate. */
4267 if (tls_type != GOT_TLS_IE_NEG)
4268 {
4269 /* xchg %ax,%ax */
4270 bfd_put_8 (output_bfd, 0x66, contents + roff);
4271 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4272 }
4273 else
4274 {
4275 /* negl %eax */
4276 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4277 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4278 }
4279
4280 continue;
4281 }
4282 else
4283 BFD_ASSERT (FALSE);
4284 break;
4285
4286 case R_386_TLS_LDM:
4287 if (! elf_i386_tls_transition (info, input_bfd,
4288 input_section, contents,
4289 symtab_hdr, sym_hashes,
4290 &r_type, GOT_UNKNOWN, rel,
4291 relend, h, r_symndx))
4292 return FALSE;
4293
4294 if (r_type != R_386_TLS_LDM)
4295 {
4296 /* LD->LE transition:
4297 leal foo(%reg), %eax; call ___tls_get_addr.
4298 We change it into:
4299 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4300 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4301 memcpy (contents + rel->r_offset - 2,
4302 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4303 /* Skip R_386_PC32/R_386_PLT32. */
4304 rel++;
4305 continue;
4306 }
4307
4308 if (htab->elf.sgot == NULL)
4309 abort ();
4310
4311 off = htab->tls_ldm_got.offset;
4312 if (off & 1)
4313 off &= ~1;
4314 else
4315 {
4316 Elf_Internal_Rela outrel;
4317
4318 if (htab->elf.srelgot == NULL)
4319 abort ();
4320
4321 outrel.r_offset = (htab->elf.sgot->output_section->vma
4322 + htab->elf.sgot->output_offset + off);
4323
4324 bfd_put_32 (output_bfd, 0,
4325 htab->elf.sgot->contents + off);
4326 bfd_put_32 (output_bfd, 0,
4327 htab->elf.sgot->contents + off + 4);
4328 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4329 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4330 htab->tls_ldm_got.offset |= 1;
4331 }
4332 relocation = htab->elf.sgot->output_section->vma
4333 + htab->elf.sgot->output_offset + off
4334 - htab->elf.sgotplt->output_section->vma
4335 - htab->elf.sgotplt->output_offset;
4336 unresolved_reloc = FALSE;
4337 break;
4338
4339 case R_386_TLS_LDO_32:
4340 if (!info->executable || (input_section->flags & SEC_CODE) == 0)
4341 relocation -= elf_i386_dtpoff_base (info);
4342 else
4343 /* When converting LDO to LE, we must negate. */
4344 relocation = -elf_i386_tpoff (info, relocation);
4345 break;
4346
4347 case R_386_TLS_LE_32:
4348 case R_386_TLS_LE:
4349 if (!info->executable)
4350 {
4351 Elf_Internal_Rela outrel;
4352 asection *sreloc;
4353
4354 outrel.r_offset = rel->r_offset
4355 + input_section->output_section->vma
4356 + input_section->output_offset;
4357 if (h != NULL && h->dynindx != -1)
4358 indx = h->dynindx;
4359 else
4360 indx = 0;
4361 if (r_type == R_386_TLS_LE_32)
4362 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4363 else
4364 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4365 sreloc = elf_section_data (input_section)->sreloc;
4366 if (sreloc == NULL)
4367 abort ();
4368 elf_append_rel (output_bfd, sreloc, &outrel);
4369 if (indx)
4370 continue;
4371 else if (r_type == R_386_TLS_LE_32)
4372 relocation = elf_i386_dtpoff_base (info) - relocation;
4373 else
4374 relocation -= elf_i386_dtpoff_base (info);
4375 }
4376 else if (r_type == R_386_TLS_LE_32)
4377 relocation = elf_i386_tpoff (info, relocation);
4378 else
4379 relocation = -elf_i386_tpoff (info, relocation);
4380 break;
4381
4382 default:
4383 break;
4384 }
4385
4386 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4387 because such sections are not SEC_ALLOC and thus ld.so will
4388 not process them. */
4389 if (unresolved_reloc
4390 && !((input_section->flags & SEC_DEBUGGING) != 0
4391 && h->def_dynamic)
4392 && _bfd_elf_section_offset (output_bfd, info, input_section,
4393 rel->r_offset) != (bfd_vma) -1)
4394 {
4395 (*_bfd_error_handler)
4396 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4397 input_bfd,
4398 input_section,
4399 (long) rel->r_offset,
4400 howto->name,
4401 h->root.root.string);
4402 return FALSE;
4403 }
4404
4405 do_relocation:
4406 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4407 contents, rel->r_offset,
4408 relocation, 0);
4409
4410 check_relocation_error:
4411 if (r != bfd_reloc_ok)
4412 {
4413 const char *name;
4414
4415 if (h != NULL)
4416 name = h->root.root.string;
4417 else
4418 {
4419 name = bfd_elf_string_from_elf_section (input_bfd,
4420 symtab_hdr->sh_link,
4421 sym->st_name);
4422 if (name == NULL)
4423 return FALSE;
4424 if (*name == '\0')
4425 name = bfd_section_name (input_bfd, sec);
4426 }
4427
4428 if (r == bfd_reloc_overflow)
4429 {
4430 if (! ((*info->callbacks->reloc_overflow)
4431 (info, (h ? &h->root : NULL), name, howto->name,
4432 (bfd_vma) 0, input_bfd, input_section,
4433 rel->r_offset)))
4434 return FALSE;
4435 }
4436 else
4437 {
4438 (*_bfd_error_handler)
4439 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4440 input_bfd, input_section,
4441 (long) rel->r_offset, name, (int) r);
4442 return FALSE;
4443 }
4444 }
4445 }
4446
4447 return TRUE;
4448 }
4449
4450 /* Finish up dynamic symbol handling. We set the contents of various
4451 dynamic sections here. */
4452
4453 static bfd_boolean
4454 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4455 struct bfd_link_info *info,
4456 struct elf_link_hash_entry *h,
4457 Elf_Internal_Sym *sym)
4458 {
4459 struct elf_i386_link_hash_table *htab;
4460 unsigned plt_entry_size;
4461 const struct elf_i386_backend_data *abed;
4462
4463 htab = elf_i386_hash_table (info);
4464 if (htab == NULL)
4465 return FALSE;
4466
4467 abed = get_elf_i386_backend_data (output_bfd);
4468 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4469
4470 if (h->plt.offset != (bfd_vma) -1)
4471 {
4472 bfd_vma plt_index;
4473 bfd_vma got_offset;
4474 Elf_Internal_Rela rel;
4475 bfd_byte *loc;
4476 asection *plt, *gotplt, *relplt;
4477
4478 /* When building a static executable, use .iplt, .igot.plt and
4479 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4480 if (htab->elf.splt != NULL)
4481 {
4482 plt = htab->elf.splt;
4483 gotplt = htab->elf.sgotplt;
4484 relplt = htab->elf.srelplt;
4485 }
4486 else
4487 {
4488 plt = htab->elf.iplt;
4489 gotplt = htab->elf.igotplt;
4490 relplt = htab->elf.irelplt;
4491 }
4492
4493 /* This symbol has an entry in the procedure linkage table. Set
4494 it up. */
4495
4496 if ((h->dynindx == -1
4497 && !((h->forced_local || info->executable)
4498 && h->def_regular
4499 && h->type == STT_GNU_IFUNC))
4500 || plt == NULL
4501 || gotplt == NULL
4502 || relplt == NULL)
4503 abort ();
4504
4505 /* Get the index in the procedure linkage table which
4506 corresponds to this symbol. This is the index of this symbol
4507 in all the symbols for which we are making plt entries. The
4508 first entry in the procedure linkage table is reserved.
4509
4510 Get the offset into the .got table of the entry that
4511 corresponds to this function. Each .got entry is 4 bytes.
4512 The first three are reserved.
4513
4514 For static executables, we don't reserve anything. */
4515
4516 if (plt == htab->elf.splt)
4517 {
4518 got_offset = h->plt.offset / plt_entry_size - 1;
4519 got_offset = (got_offset + 3) * 4;
4520 }
4521 else
4522 {
4523 got_offset = h->plt.offset / plt_entry_size;
4524 got_offset = got_offset * 4;
4525 }
4526
4527 /* Fill in the entry in the procedure linkage table. */
4528 if (! info->shared)
4529 {
4530 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
4531 abed->plt->plt_entry_size);
4532 bfd_put_32 (output_bfd,
4533 (gotplt->output_section->vma
4534 + gotplt->output_offset
4535 + got_offset),
4536 plt->contents + h->plt.offset
4537 + abed->plt->plt_got_offset);
4538
4539 if (abed->is_vxworks)
4540 {
4541 int s, k, reloc_index;
4542
4543 /* Create the R_386_32 relocation referencing the GOT
4544 for this PLT entry. */
4545
4546 /* S: Current slot number (zero-based). */
4547 s = ((h->plt.offset - abed->plt->plt_entry_size)
4548 / abed->plt->plt_entry_size);
4549 /* K: Number of relocations for PLTResolve. */
4550 if (info->shared)
4551 k = PLTRESOLVE_RELOCS_SHLIB;
4552 else
4553 k = PLTRESOLVE_RELOCS;
4554 /* Skip the PLTresolve relocations, and the relocations for
4555 the other PLT slots. */
4556 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
4557 loc = (htab->srelplt2->contents + reloc_index
4558 * sizeof (Elf32_External_Rel));
4559
4560 rel.r_offset = (htab->elf.splt->output_section->vma
4561 + htab->elf.splt->output_offset
4562 + h->plt.offset + 2),
4563 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4564 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4565
4566 /* Create the R_386_32 relocation referencing the beginning of
4567 the PLT for this GOT entry. */
4568 rel.r_offset = (htab->elf.sgotplt->output_section->vma
4569 + htab->elf.sgotplt->output_offset
4570 + got_offset);
4571 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4572 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4573 loc + sizeof (Elf32_External_Rel));
4574 }
4575 }
4576 else
4577 {
4578 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
4579 abed->plt->plt_entry_size);
4580 bfd_put_32 (output_bfd, got_offset,
4581 plt->contents + h->plt.offset
4582 + abed->plt->plt_got_offset);
4583 }
4584
4585 /* Fill in the entry in the global offset table. */
4586 bfd_put_32 (output_bfd,
4587 (plt->output_section->vma
4588 + plt->output_offset
4589 + h->plt.offset
4590 + abed->plt->plt_lazy_offset),
4591 gotplt->contents + got_offset);
4592
4593 /* Fill in the entry in the .rel.plt section. */
4594 rel.r_offset = (gotplt->output_section->vma
4595 + gotplt->output_offset
4596 + got_offset);
4597 if (h->dynindx == -1
4598 || ((info->executable
4599 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
4600 && h->def_regular
4601 && h->type == STT_GNU_IFUNC))
4602 {
4603 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4604 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
4605 in the .got.plt section. */
4606 bfd_put_32 (output_bfd,
4607 (h->root.u.def.value
4608 + h->root.u.def.section->output_section->vma
4609 + h->root.u.def.section->output_offset),
4610 gotplt->contents + got_offset);
4611 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
4612 /* R_386_IRELATIVE comes last. */
4613 plt_index = htab->next_irelative_index--;
4614 }
4615 else
4616 {
4617 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
4618 plt_index = htab->next_jump_slot_index++;
4619 }
4620 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
4621 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
4622
4623 /* Don't fill PLT entry for static executables. */
4624 if (plt == htab->elf.splt)
4625 {
4626 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
4627 plt->contents + h->plt.offset
4628 + abed->plt->plt_reloc_offset);
4629 bfd_put_32 (output_bfd, - (h->plt.offset
4630 + abed->plt->plt_plt_offset + 4),
4631 plt->contents + h->plt.offset
4632 + abed->plt->plt_plt_offset);
4633 }
4634
4635 if (!h->def_regular)
4636 {
4637 /* Mark the symbol as undefined, rather than as defined in
4638 the .plt section. Leave the value if there were any
4639 relocations where pointer equality matters (this is a clue
4640 for the dynamic linker, to make function pointer
4641 comparisons work between an application and shared
4642 library), otherwise set it to zero. If a function is only
4643 called from a binary, there is no need to slow down
4644 shared libraries because of that. */
4645 sym->st_shndx = SHN_UNDEF;
4646 if (!h->pointer_equality_needed)
4647 sym->st_value = 0;
4648 }
4649 }
4650
4651 if (h->got.offset != (bfd_vma) -1
4652 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
4653 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
4654 {
4655 Elf_Internal_Rela rel;
4656
4657 /* This symbol has an entry in the global offset table. Set it
4658 up. */
4659
4660 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
4661 abort ();
4662
4663 rel.r_offset = (htab->elf.sgot->output_section->vma
4664 + htab->elf.sgot->output_offset
4665 + (h->got.offset & ~(bfd_vma) 1));
4666
4667 /* If this is a static link, or it is a -Bsymbolic link and the
4668 symbol is defined locally or was forced to be local because
4669 of a version file, we just want to emit a RELATIVE reloc.
4670 The entry in the global offset table will already have been
4671 initialized in the relocate_section function. */
4672 if (h->def_regular
4673 && h->type == STT_GNU_IFUNC)
4674 {
4675 if (info->shared)
4676 {
4677 /* Generate R_386_GLOB_DAT. */
4678 goto do_glob_dat;
4679 }
4680 else
4681 {
4682 asection *plt;
4683
4684 if (!h->pointer_equality_needed)
4685 abort ();
4686
4687 /* For non-shared object, we can't use .got.plt, which
4688 contains the real function addres if we need pointer
4689 equality. We load the GOT entry with the PLT entry. */
4690 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
4691 bfd_put_32 (output_bfd,
4692 (plt->output_section->vma
4693 + plt->output_offset + h->plt.offset),
4694 htab->elf.sgot->contents + h->got.offset);
4695 return TRUE;
4696 }
4697 }
4698 else if (info->shared
4699 && SYMBOL_REFERENCES_LOCAL (info, h))
4700 {
4701 BFD_ASSERT((h->got.offset & 1) != 0);
4702 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4703 }
4704 else
4705 {
4706 BFD_ASSERT((h->got.offset & 1) == 0);
4707 do_glob_dat:
4708 bfd_put_32 (output_bfd, (bfd_vma) 0,
4709 htab->elf.sgot->contents + h->got.offset);
4710 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
4711 }
4712
4713 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
4714 }
4715
4716 if (h->needs_copy)
4717 {
4718 Elf_Internal_Rela rel;
4719
4720 /* This symbol needs a copy reloc. Set it up. */
4721
4722 if (h->dynindx == -1
4723 || (h->root.type != bfd_link_hash_defined
4724 && h->root.type != bfd_link_hash_defweak)
4725 || htab->srelbss == NULL)
4726 abort ();
4727
4728 rel.r_offset = (h->root.u.def.value
4729 + h->root.u.def.section->output_section->vma
4730 + h->root.u.def.section->output_offset);
4731 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4732 elf_append_rel (output_bfd, htab->srelbss, &rel);
4733 }
4734
4735 return TRUE;
4736 }
4737
4738 /* Finish up local dynamic symbol handling. We set the contents of
4739 various dynamic sections here. */
4740
4741 static bfd_boolean
4742 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4743 {
4744 struct elf_link_hash_entry *h
4745 = (struct elf_link_hash_entry *) *slot;
4746 struct bfd_link_info *info
4747 = (struct bfd_link_info *) inf;
4748
4749 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4750 h, NULL);
4751 }
4752
4753 /* Used to decide how to sort relocs in an optimal manner for the
4754 dynamic linker, before writing them out. */
4755
4756 static enum elf_reloc_type_class
4757 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
4758 {
4759 switch (ELF32_R_TYPE (rela->r_info))
4760 {
4761 case R_386_RELATIVE:
4762 return reloc_class_relative;
4763 case R_386_JUMP_SLOT:
4764 return reloc_class_plt;
4765 case R_386_COPY:
4766 return reloc_class_copy;
4767 default:
4768 return reloc_class_normal;
4769 }
4770 }
4771
4772 /* Finish up the dynamic sections. */
4773
4774 static bfd_boolean
4775 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4776 struct bfd_link_info *info)
4777 {
4778 struct elf_i386_link_hash_table *htab;
4779 bfd *dynobj;
4780 asection *sdyn;
4781 const struct elf_i386_backend_data *abed;
4782
4783 htab = elf_i386_hash_table (info);
4784 if (htab == NULL)
4785 return FALSE;
4786
4787 dynobj = htab->elf.dynobj;
4788 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4789 abed = get_elf_i386_backend_data (output_bfd);
4790
4791 if (htab->elf.dynamic_sections_created)
4792 {
4793 Elf32_External_Dyn *dyncon, *dynconend;
4794
4795 if (sdyn == NULL || htab->elf.sgot == NULL)
4796 abort ();
4797
4798 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4799 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4800 for (; dyncon < dynconend; dyncon++)
4801 {
4802 Elf_Internal_Dyn dyn;
4803 asection *s;
4804
4805 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4806
4807 switch (dyn.d_tag)
4808 {
4809 default:
4810 if (abed->is_vxworks
4811 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4812 break;
4813 continue;
4814
4815 case DT_PLTGOT:
4816 s = htab->elf.sgotplt;
4817 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4818 break;
4819
4820 case DT_JMPREL:
4821 s = htab->elf.srelplt;
4822 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4823 break;
4824
4825 case DT_PLTRELSZ:
4826 s = htab->elf.srelplt;
4827 dyn.d_un.d_val = s->size;
4828 break;
4829
4830 case DT_RELSZ:
4831 /* My reading of the SVR4 ABI indicates that the
4832 procedure linkage table relocs (DT_JMPREL) should be
4833 included in the overall relocs (DT_REL). This is
4834 what Solaris does. However, UnixWare can not handle
4835 that case. Therefore, we override the DT_RELSZ entry
4836 here to make it not include the JMPREL relocs. */
4837 s = htab->elf.srelplt;
4838 if (s == NULL)
4839 continue;
4840 dyn.d_un.d_val -= s->size;
4841 break;
4842
4843 case DT_REL:
4844 /* We may not be using the standard ELF linker script.
4845 If .rel.plt is the first .rel section, we adjust
4846 DT_REL to not include it. */
4847 s = htab->elf.srelplt;
4848 if (s == NULL)
4849 continue;
4850 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
4851 continue;
4852 dyn.d_un.d_ptr += s->size;
4853 break;
4854 }
4855
4856 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4857 }
4858
4859 /* Fill in the first entry in the procedure linkage table. */
4860 if (htab->elf.splt && htab->elf.splt->size > 0)
4861 {
4862 if (info->shared)
4863 {
4864 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
4865 abed->plt->plt0_entry_size);
4866 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4867 abed->plt0_pad_byte,
4868 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4869 }
4870 else
4871 {
4872 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
4873 abed->plt->plt0_entry_size);
4874 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
4875 abed->plt0_pad_byte,
4876 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
4877 bfd_put_32 (output_bfd,
4878 (htab->elf.sgotplt->output_section->vma
4879 + htab->elf.sgotplt->output_offset
4880 + 4),
4881 htab->elf.splt->contents
4882 + abed->plt->plt0_got1_offset);
4883 bfd_put_32 (output_bfd,
4884 (htab->elf.sgotplt->output_section->vma
4885 + htab->elf.sgotplt->output_offset
4886 + 8),
4887 htab->elf.splt->contents
4888 + abed->plt->plt0_got2_offset);
4889
4890 if (abed->is_vxworks)
4891 {
4892 Elf_Internal_Rela rel;
4893
4894 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
4895 On IA32 we use REL relocations so the addend goes in
4896 the PLT directly. */
4897 rel.r_offset = (htab->elf.splt->output_section->vma
4898 + htab->elf.splt->output_offset
4899 + abed->plt->plt0_got1_offset);
4900 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4901 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4902 htab->srelplt2->contents);
4903 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
4904 rel.r_offset = (htab->elf.splt->output_section->vma
4905 + htab->elf.splt->output_offset
4906 + abed->plt->plt0_got2_offset);
4907 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4908 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4909 htab->srelplt2->contents +
4910 sizeof (Elf32_External_Rel));
4911 }
4912 }
4913
4914 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4915 really seem like the right value. */
4916 elf_section_data (htab->elf.splt->output_section)
4917 ->this_hdr.sh_entsize = 4;
4918
4919 /* Correct the .rel.plt.unloaded relocations. */
4920 if (abed->is_vxworks && !info->shared)
4921 {
4922 int num_plts = (htab->elf.splt->size
4923 / abed->plt->plt_entry_size) - 1;
4924 unsigned char *p;
4925
4926 p = htab->srelplt2->contents;
4927 if (info->shared)
4928 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4929 else
4930 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4931
4932 for (; num_plts; num_plts--)
4933 {
4934 Elf_Internal_Rela rel;
4935 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4936 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
4937 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4938 p += sizeof (Elf32_External_Rel);
4939
4940 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4941 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
4942 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4943 p += sizeof (Elf32_External_Rel);
4944 }
4945 }
4946 }
4947 }
4948
4949 if (htab->elf.sgotplt)
4950 {
4951 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4952 {
4953 (*_bfd_error_handler)
4954 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4955 return FALSE;
4956 }
4957
4958 /* Fill in the first three entries in the global offset table. */
4959 if (htab->elf.sgotplt->size > 0)
4960 {
4961 bfd_put_32 (output_bfd,
4962 (sdyn == NULL ? 0
4963 : sdyn->output_section->vma + sdyn->output_offset),
4964 htab->elf.sgotplt->contents);
4965 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4966 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4967 }
4968
4969 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4970 }
4971
4972 /* Adjust .eh_frame for .plt section. */
4973 if (htab->plt_eh_frame != NULL
4974 && htab->plt_eh_frame->contents != NULL)
4975 {
4976 if (htab->elf.splt != NULL
4977 && htab->elf.splt->size != 0
4978 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4979 && htab->elf.splt->output_section != NULL
4980 && htab->plt_eh_frame->output_section != NULL)
4981 {
4982 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4983 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4984 + htab->plt_eh_frame->output_offset
4985 + PLT_FDE_START_OFFSET;
4986 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4987 htab->plt_eh_frame->contents
4988 + PLT_FDE_START_OFFSET);
4989 }
4990 if (htab->plt_eh_frame->sec_info_type
4991 == SEC_INFO_TYPE_EH_FRAME)
4992 {
4993 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4994 htab->plt_eh_frame,
4995 htab->plt_eh_frame->contents))
4996 return FALSE;
4997 }
4998 }
4999
5000 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5001 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5002
5003 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5004 htab_traverse (htab->loc_hash_table,
5005 elf_i386_finish_local_dynamic_symbol,
5006 info);
5007
5008 return TRUE;
5009 }
5010
5011 /* Return address for Ith PLT stub in section PLT, for relocation REL
5012 or (bfd_vma) -1 if it should not be included. */
5013
5014 static bfd_vma
5015 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
5016 const arelent *rel ATTRIBUTE_UNUSED)
5017 {
5018 return plt->vma + (i + 1) * GET_PLT_ENTRY_SIZE (plt->owner);
5019 }
5020
5021 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5022
5023 static bfd_boolean
5024 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5025 {
5026 if (h->plt.offset != (bfd_vma) -1
5027 && !h->def_regular
5028 && !h->pointer_equality_needed)
5029 return FALSE;
5030
5031 return _bfd_elf_hash_symbol (h);
5032 }
5033
5034 /* Hook called by the linker routine which adds symbols from an object
5035 file. */
5036
5037 static bfd_boolean
5038 elf_i386_add_symbol_hook (bfd * abfd,
5039 struct bfd_link_info * info ATTRIBUTE_UNUSED,
5040 Elf_Internal_Sym * sym,
5041 const char ** namep ATTRIBUTE_UNUSED,
5042 flagword * flagsp ATTRIBUTE_UNUSED,
5043 asection ** secp ATTRIBUTE_UNUSED,
5044 bfd_vma * valp ATTRIBUTE_UNUSED)
5045 {
5046 if ((abfd->flags & DYNAMIC) == 0
5047 && (ELF_ST_TYPE (sym->st_info) == STT_GNU_IFUNC
5048 || ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE))
5049 elf_tdata (info->output_bfd)->has_gnu_symbols = TRUE;
5050
5051 return TRUE;
5052 }
5053
5054 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
5055 #define TARGET_LITTLE_NAME "elf32-i386"
5056 #define ELF_ARCH bfd_arch_i386
5057 #define ELF_TARGET_ID I386_ELF_DATA
5058 #define ELF_MACHINE_CODE EM_386
5059 #define ELF_MAXPAGESIZE 0x1000
5060
5061 #define elf_backend_can_gc_sections 1
5062 #define elf_backend_can_refcount 1
5063 #define elf_backend_want_got_plt 1
5064 #define elf_backend_plt_readonly 1
5065 #define elf_backend_want_plt_sym 0
5066 #define elf_backend_got_header_size 12
5067 #define elf_backend_plt_alignment 4
5068
5069 /* Support RELA for objdump of prelink objects. */
5070 #define elf_info_to_howto elf_i386_info_to_howto_rel
5071 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5072
5073 #define bfd_elf32_mkobject elf_i386_mkobject
5074
5075 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5076 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5077 #define bfd_elf32_bfd_link_hash_table_free elf_i386_link_hash_table_free
5078 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5079 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5080
5081 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5082 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5083 #define elf_backend_check_relocs elf_i386_check_relocs
5084 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5085 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5086 #define elf_backend_fake_sections elf_i386_fake_sections
5087 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5088 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5089 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5090 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5091 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5092 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5093 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5094 #define elf_backend_relocate_section elf_i386_relocate_section
5095 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5096 #define elf_backend_always_size_sections elf_i386_always_size_sections
5097 #define elf_backend_omit_section_dynsym \
5098 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5099 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
5100 #define elf_backend_hash_symbol elf_i386_hash_symbol
5101 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5102 #undef elf_backend_post_process_headers
5103 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5104
5105 #include "elf32-target.h"
5106
5107 /* FreeBSD support. */
5108
5109 #undef TARGET_LITTLE_SYM
5110 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
5111 #undef TARGET_LITTLE_NAME
5112 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5113 #undef ELF_OSABI
5114 #define ELF_OSABI ELFOSABI_FREEBSD
5115
5116 /* The kernel recognizes executables as valid only if they carry a
5117 "FreeBSD" label in the ELF header. So we put this label on all
5118 executables and (for simplicity) also all other object files. */
5119
5120 static void
5121 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5122 {
5123 _bfd_elf_set_osabi (abfd, info);
5124
5125 #ifdef OLD_FREEBSD_ABI_LABEL
5126 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5127 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5128 #endif
5129 }
5130
5131 #undef elf_backend_post_process_headers
5132 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5133 #undef elf32_bed
5134 #define elf32_bed elf32_i386_fbsd_bed
5135
5136 #undef elf_backend_add_symbol_hook
5137
5138 #include "elf32-target.h"
5139
5140 /* Solaris 2. */
5141
5142 #undef TARGET_LITTLE_SYM
5143 #define TARGET_LITTLE_SYM bfd_elf32_i386_sol2_vec
5144 #undef TARGET_LITTLE_NAME
5145 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5146
5147 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5148 objects won't be recognized. */
5149 #undef ELF_OSABI
5150
5151 #undef elf32_bed
5152 #define elf32_bed elf32_i386_sol2_bed
5153
5154 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5155 boundary. */
5156 #undef elf_backend_static_tls_alignment
5157 #define elf_backend_static_tls_alignment 8
5158
5159 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5160
5161 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5162 File, p.63. */
5163 #undef elf_backend_want_plt_sym
5164 #define elf_backend_want_plt_sym 1
5165
5166 #include "elf32-target.h"
5167
5168 /* Native Client support. */
5169
5170 #undef TARGET_LITTLE_SYM
5171 #define TARGET_LITTLE_SYM bfd_elf32_i386_nacl_vec
5172 #undef TARGET_LITTLE_NAME
5173 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5174 #undef elf32_bed
5175 #define elf32_bed elf32_i386_nacl_bed
5176
5177 #undef ELF_MAXPAGESIZE
5178 #define ELF_MAXPAGESIZE 0x10000
5179
5180 /* Restore defaults. */
5181 #undef ELF_OSABI
5182 #undef elf_backend_want_plt_sym
5183 #define elf_backend_want_plt_sym 0
5184 #undef elf_backend_post_process_headers
5185 #define elf_backend_post_process_headers _bfd_elf_set_osabi
5186 #undef elf_backend_static_tls_alignment
5187
5188 /* NaCl uses substantially different PLT entries for the same effects. */
5189
5190 #undef elf_backend_plt_alignment
5191 #define elf_backend_plt_alignment 5
5192 #define NACL_PLT_ENTRY_SIZE 64
5193 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5194
5195 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5196 {
5197 0xff, 0x35, /* pushl contents of address */
5198 0, 0, 0, 0, /* replaced with address of .got + 4. */
5199 0x8b, 0x0d, /* movl contents of address, %ecx */
5200 0, 0, 0, 0, /* replaced with address of .got + 8. */
5201 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5202 0xff, 0xe1 /* jmp *%ecx */
5203 };
5204
5205 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5206 {
5207 0x8b, 0x0d, /* movl contents of address, %ecx */
5208 0, 0, 0, 0, /* replaced with GOT slot address. */
5209 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5210 0xff, 0xe1, /* jmp *%ecx */
5211
5212 /* Pad to the next 32-byte boundary with nop instructions. */
5213 0x90,
5214 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5215 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5216
5217 /* Lazy GOT entries point here (32-byte aligned). */
5218 0x68, /* pushl immediate */
5219 0, 0, 0, 0, /* replaced with reloc offset. */
5220 0xe9, /* jmp relative */
5221 0, 0, 0, 0, /* replaced with offset to .plt. */
5222
5223 /* Pad to the next 32-byte boundary with nop instructions. */
5224 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5225 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5226 0x90, 0x90
5227 };
5228
5229 static const bfd_byte
5230 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5231 {
5232 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5233 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5234 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5235 0xff, 0xe1, /* jmp *%ecx */
5236
5237 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5238 so pad to that size with nop instructions. */
5239 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5240 };
5241
5242 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5243 {
5244 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5245 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5246 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5247 0xff, 0xe1, /* jmp *%ecx */
5248
5249 /* Pad to the next 32-byte boundary with nop instructions. */
5250 0x90,
5251 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5252 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5253
5254 /* Lazy GOT entries point here (32-byte aligned). */
5255 0x68, /* pushl immediate */
5256 0, 0, 0, 0, /* replaced with offset into relocation table. */
5257 0xe9, /* jmp relative */
5258 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5259
5260 /* Pad to the next 32-byte boundary with nop instructions. */
5261 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5262 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5263 0x90, 0x90
5264 };
5265
5266 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5267 {
5268 #if (PLT_CIE_LENGTH != 20 \
5269 || PLT_FDE_LENGTH != 36 \
5270 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5271 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5272 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5273 #endif
5274 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5275 0, 0, 0, 0, /* CIE ID */
5276 1, /* CIE version */
5277 'z', 'R', 0, /* Augmentation string */
5278 1, /* Code alignment factor */
5279 0x7c, /* Data alignment factor: -4 */
5280 8, /* Return address column */
5281 1, /* Augmentation size */
5282 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5283 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5284 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5285 DW_CFA_nop, DW_CFA_nop,
5286
5287 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5288 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5289 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5290 0, 0, 0, 0, /* .plt size goes here */
5291 0, /* Augmentation size */
5292 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5293 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5294 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5295 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5296 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5297 13, /* Block length */
5298 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5299 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5300 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5301 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5302 DW_CFA_nop, DW_CFA_nop
5303 };
5304
5305 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5306 {
5307 elf_i386_nacl_plt0_entry, /* plt0_entry */
5308 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5309 2, /* plt0_got1_offset */
5310 8, /* plt0_got2_offset */
5311 elf_i386_nacl_plt_entry, /* plt_entry */
5312 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5313 2, /* plt_got_offset */
5314 33, /* plt_reloc_offset */
5315 38, /* plt_plt_offset */
5316 32, /* plt_lazy_offset */
5317 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5318 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5319 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5320 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
5321 };
5322
5323 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5324 {
5325 &elf_i386_nacl_plt, /* plt */
5326 0x90, /* plt0_pad_byte: nop insn */
5327 0, /* is_vxworks */
5328 };
5329
5330 #undef elf_backend_arch_data
5331 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5332
5333 #undef elf_backend_modify_segment_map
5334 #define elf_backend_modify_segment_map nacl_modify_segment_map
5335 #undef elf_backend_modify_program_headers
5336 #define elf_backend_modify_program_headers nacl_modify_program_headers
5337
5338 #include "elf32-target.h"
5339
5340 /* Restore defaults. */
5341 #undef elf_backend_modify_segment_map
5342 #undef elf_backend_modify_program_headers
5343
5344 /* VxWorks support. */
5345
5346 #undef TARGET_LITTLE_SYM
5347 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
5348 #undef TARGET_LITTLE_NAME
5349 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5350 #undef ELF_OSABI
5351 #undef elf_backend_plt_alignment
5352 #define elf_backend_plt_alignment 4
5353
5354 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5355 {
5356 &elf_i386_plt, /* plt */
5357 0x90, /* plt0_pad_byte */
5358 1, /* is_vxworks */
5359 };
5360
5361 #undef elf_backend_arch_data
5362 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5363
5364 #undef elf_backend_relocs_compatible
5365 #undef elf_backend_post_process_headers
5366 #undef elf_backend_add_symbol_hook
5367 #define elf_backend_add_symbol_hook \
5368 elf_vxworks_add_symbol_hook
5369 #undef elf_backend_link_output_symbol_hook
5370 #define elf_backend_link_output_symbol_hook \
5371 elf_vxworks_link_output_symbol_hook
5372 #undef elf_backend_emit_relocs
5373 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5374 #undef elf_backend_final_write_processing
5375 #define elf_backend_final_write_processing \
5376 elf_vxworks_final_write_processing
5377 #undef elf_backend_static_tls_alignment
5378
5379 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5380 define it. */
5381 #undef elf_backend_want_plt_sym
5382 #define elf_backend_want_plt_sym 1
5383
5384 #undef elf32_bed
5385 #define elf32_bed elf32_i386_vxworks_bed
5386
5387 #include "elf32-target.h"