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ld/
[binutils.git] / bfd / elf32-i386.c
blob59ffa630f052076db40c356340324902ef534b6a
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 Free Software Foundation, Inc.
4
5 This file is part of BFD, the Binary File Descriptor library.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-vxworks.h"
27
28 /* 386 uses REL relocations instead of RELA. */
29 #define USE_REL 1
30
31 #include "elf/i386.h"
32
33 static reloc_howto_type elf_howto_table[]=
34 {
35 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
36 bfd_elf_generic_reloc, "R_386_NONE",
37 TRUE, 0x00000000, 0x00000000, FALSE),
38 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
39 bfd_elf_generic_reloc, "R_386_32",
40 TRUE, 0xffffffff, 0xffffffff, FALSE),
41 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
42 bfd_elf_generic_reloc, "R_386_PC32",
43 TRUE, 0xffffffff, 0xffffffff, TRUE),
44 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_GOT32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PLT32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_COPY",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
55 TRUE, 0xffffffff, 0xffffffff, FALSE),
56 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_RELATIVE",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_GOTOFF",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_GOTPC",
67 TRUE, 0xffffffff, 0xffffffff, TRUE),
68
69 /* We have a gap in the reloc numbers here.
70 R_386_standard counts the number up to this point, and
71 R_386_ext_offset is the value to subtract from a reloc type of
72 R_386_16 thru R_386_PC8 to form an index into this table. */
73 #define R_386_standard (R_386_GOTPC + 1)
74 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
75
76 /* These relocs are a GNU extension. */
77 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
78 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
79 TRUE, 0xffffffff, 0xffffffff, FALSE),
80 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
81 bfd_elf_generic_reloc, "R_386_TLS_IE",
82 TRUE, 0xffffffff, 0xffffffff, FALSE),
83 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_LE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GD",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LDM",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_16",
97 TRUE, 0xffff, 0xffff, FALSE),
98 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_PC16",
100 TRUE, 0xffff, 0xffff, TRUE),
101 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_8",
103 TRUE, 0xff, 0xff, FALSE),
104 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
105 bfd_elf_generic_reloc, "R_386_PC8",
106 TRUE, 0xff, 0xff, TRUE),
107
108 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
109 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
110 /* These are common with Solaris TLS implementation. */
111 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
112 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
113 TRUE, 0xffffffff, 0xffffffff, FALSE),
114 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
115 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
116 TRUE, 0xffffffff, 0xffffffff, FALSE),
117 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 EMPTY_HOWTO (38),
130 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
131 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
132 TRUE, 0xffffffff, 0xffffffff, FALSE),
133 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
134 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
135 FALSE, 0, 0, FALSE),
136 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
137 bfd_elf_generic_reloc, "R_386_TLS_DESC",
138 TRUE, 0xffffffff, 0xffffffff, FALSE),
139
140 /* Another gap. */
141 #define R_386_tls (R_386_TLS_DESC + 1 - R_386_tls_offset)
142 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
143
144 /* GNU extension to record C++ vtable hierarchy. */
145 HOWTO (R_386_GNU_VTINHERIT, /* type */
146 0, /* rightshift */
147 2, /* size (0 = byte, 1 = short, 2 = long) */
148 0, /* bitsize */
149 FALSE, /* pc_relative */
150 0, /* bitpos */
151 complain_overflow_dont, /* complain_on_overflow */
152 NULL, /* special_function */
153 "R_386_GNU_VTINHERIT", /* name */
154 FALSE, /* partial_inplace */
155 0, /* src_mask */
156 0, /* dst_mask */
157 FALSE), /* pcrel_offset */
158
159 /* GNU extension to record C++ vtable member usage. */
160 HOWTO (R_386_GNU_VTENTRY, /* type */
161 0, /* rightshift */
162 2, /* size (0 = byte, 1 = short, 2 = long) */
163 0, /* bitsize */
164 FALSE, /* pc_relative */
165 0, /* bitpos */
166 complain_overflow_dont, /* complain_on_overflow */
167 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
168 "R_386_GNU_VTENTRY", /* name */
169 FALSE, /* partial_inplace */
170 0, /* src_mask */
171 0, /* dst_mask */
172 FALSE) /* pcrel_offset */
173
174 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
175
176 };
177
178 #ifdef DEBUG_GEN_RELOC
179 #define TRACE(str) \
180 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
181 #else
182 #define TRACE(str)
183 #endif
184
185 static reloc_howto_type *
186 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
187 bfd_reloc_code_real_type code)
188 {
189 switch (code)
190 {
191 case BFD_RELOC_NONE:
192 TRACE ("BFD_RELOC_NONE");
193 return &elf_howto_table[R_386_NONE];
194
195 case BFD_RELOC_32:
196 TRACE ("BFD_RELOC_32");
197 return &elf_howto_table[R_386_32];
198
199 case BFD_RELOC_CTOR:
200 TRACE ("BFD_RELOC_CTOR");
201 return &elf_howto_table[R_386_32];
202
203 case BFD_RELOC_32_PCREL:
204 TRACE ("BFD_RELOC_PC32");
205 return &elf_howto_table[R_386_PC32];
206
207 case BFD_RELOC_386_GOT32:
208 TRACE ("BFD_RELOC_386_GOT32");
209 return &elf_howto_table[R_386_GOT32];
210
211 case BFD_RELOC_386_PLT32:
212 TRACE ("BFD_RELOC_386_PLT32");
213 return &elf_howto_table[R_386_PLT32];
214
215 case BFD_RELOC_386_COPY:
216 TRACE ("BFD_RELOC_386_COPY");
217 return &elf_howto_table[R_386_COPY];
218
219 case BFD_RELOC_386_GLOB_DAT:
220 TRACE ("BFD_RELOC_386_GLOB_DAT");
221 return &elf_howto_table[R_386_GLOB_DAT];
222
223 case BFD_RELOC_386_JUMP_SLOT:
224 TRACE ("BFD_RELOC_386_JUMP_SLOT");
225 return &elf_howto_table[R_386_JUMP_SLOT];
226
227 case BFD_RELOC_386_RELATIVE:
228 TRACE ("BFD_RELOC_386_RELATIVE");
229 return &elf_howto_table[R_386_RELATIVE];
230
231 case BFD_RELOC_386_GOTOFF:
232 TRACE ("BFD_RELOC_386_GOTOFF");
233 return &elf_howto_table[R_386_GOTOFF];
234
235 case BFD_RELOC_386_GOTPC:
236 TRACE ("BFD_RELOC_386_GOTPC");
237 return &elf_howto_table[R_386_GOTPC];
238
239 /* These relocs are a GNU extension. */
240 case BFD_RELOC_386_TLS_TPOFF:
241 TRACE ("BFD_RELOC_386_TLS_TPOFF");
242 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
243
244 case BFD_RELOC_386_TLS_IE:
245 TRACE ("BFD_RELOC_386_TLS_IE");
246 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
247
248 case BFD_RELOC_386_TLS_GOTIE:
249 TRACE ("BFD_RELOC_386_TLS_GOTIE");
250 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
251
252 case BFD_RELOC_386_TLS_LE:
253 TRACE ("BFD_RELOC_386_TLS_LE");
254 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_GD:
257 TRACE ("BFD_RELOC_386_TLS_GD");
258 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_LDM:
261 TRACE ("BFD_RELOC_386_TLS_LDM");
262 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
263
264 case BFD_RELOC_16:
265 TRACE ("BFD_RELOC_16");
266 return &elf_howto_table[R_386_16 - R_386_ext_offset];
267
268 case BFD_RELOC_16_PCREL:
269 TRACE ("BFD_RELOC_16_PCREL");
270 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
271
272 case BFD_RELOC_8:
273 TRACE ("BFD_RELOC_8");
274 return &elf_howto_table[R_386_8 - R_386_ext_offset];
275
276 case BFD_RELOC_8_PCREL:
277 TRACE ("BFD_RELOC_8_PCREL");
278 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
279
280 /* Common with Sun TLS implementation. */
281 case BFD_RELOC_386_TLS_LDO_32:
282 TRACE ("BFD_RELOC_386_TLS_LDO_32");
283 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
284
285 case BFD_RELOC_386_TLS_IE_32:
286 TRACE ("BFD_RELOC_386_TLS_IE_32");
287 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
288
289 case BFD_RELOC_386_TLS_LE_32:
290 TRACE ("BFD_RELOC_386_TLS_LE_32");
291 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
292
293 case BFD_RELOC_386_TLS_DTPMOD32:
294 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
295 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_DTPOFF32:
298 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
299 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_TPOFF32:
302 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
303 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_GOTDESC:
306 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
307 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
308
309 case BFD_RELOC_386_TLS_DESC_CALL:
310 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
311 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_DESC:
314 TRACE ("BFD_RELOC_386_TLS_DESC");
315 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
316
317 case BFD_RELOC_VTABLE_INHERIT:
318 TRACE ("BFD_RELOC_VTABLE_INHERIT");
319 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
320
321 case BFD_RELOC_VTABLE_ENTRY:
322 TRACE ("BFD_RELOC_VTABLE_ENTRY");
323 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
324
325 default:
326 break;
327 }
328
329 TRACE ("Unknown");
330 return 0;
331 }
332
333 static reloc_howto_type *
334 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
335 const char *r_name)
336 {
337 unsigned int i;
338
339 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
340 if (elf_howto_table[i].name != NULL
341 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
342 return &elf_howto_table[i];
343
344 return NULL;
345 }
346
347 static void
348 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
349 arelent *cache_ptr,
350 Elf_Internal_Rela *dst)
351 {
352 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
353 unsigned int indx;
354
355 if ((indx = r_type) >= R_386_standard
356 && ((indx = r_type - R_386_ext_offset) - R_386_standard
357 >= R_386_ext - R_386_standard)
358 && ((indx = r_type - R_386_tls_offset) - R_386_ext
359 >= R_386_tls - R_386_ext)
360 && ((indx = r_type - R_386_vt_offset) - R_386_tls
361 >= R_386_vt - R_386_tls))
362 {
363 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
364 abfd, (int) r_type);
365 indx = R_386_NONE;
366 }
367 cache_ptr->howto = &elf_howto_table[indx];
368 }
369
370 /* Return whether a symbol name implies a local label. The UnixWare
371 2.1 cc generates temporary symbols that start with .X, so we
372 recognize them here. FIXME: do other SVR4 compilers also use .X?.
373 If so, we should move the .X recognition into
374 _bfd_elf_is_local_label_name. */
375
376 static bfd_boolean
377 elf_i386_is_local_label_name (bfd *abfd, const char *name)
378 {
379 if (name[0] == '.' && name[1] == 'X')
380 return TRUE;
381
382 return _bfd_elf_is_local_label_name (abfd, name);
383 }
384 \f
385 /* Support for core dump NOTE sections. */
386
387 static bfd_boolean
388 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
389 {
390 int offset;
391 size_t size;
392
393 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
394 {
395 int pr_version = bfd_get_32 (abfd, note->descdata);
396
397 if (pr_version != 1)
398 return FALSE;
399
400 /* pr_cursig */
401 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
402
403 /* pr_pid */
404 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
405
406 /* pr_reg */
407 offset = 28;
408 size = bfd_get_32 (abfd, note->descdata + 8);
409 }
410 else
411 {
412 switch (note->descsz)
413 {
414 default:
415 return FALSE;
416
417 case 144: /* Linux/i386 */
418 /* pr_cursig */
419 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
420
421 /* pr_pid */
422 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
423
424 /* pr_reg */
425 offset = 72;
426 size = 68;
427
428 break;
429 }
430 }
431
432 /* Make a ".reg/999" section. */
433 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
434 size, note->descpos + offset);
435 }
436
437 static bfd_boolean
438 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
439 {
440 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
441 {
442 int pr_version = bfd_get_32 (abfd, note->descdata);
443
444 if (pr_version != 1)
445 return FALSE;
446
447 elf_tdata (abfd)->core_program
448 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
449 elf_tdata (abfd)->core_command
450 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
451 }
452 else
453 {
454 switch (note->descsz)
455 {
456 default:
457 return FALSE;
458
459 case 124: /* Linux/i386 elf_prpsinfo. */
460 elf_tdata (abfd)->core_program
461 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
462 elf_tdata (abfd)->core_command
463 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
464 }
465 }
466
467 /* Note that for some reason, a spurious space is tacked
468 onto the end of the args in some (at least one anyway)
469 implementations, so strip it off if it exists. */
470 {
471 char *command = elf_tdata (abfd)->core_command;
472 int n = strlen (command);
473
474 if (0 < n && command[n - 1] == ' ')
475 command[n - 1] = '\0';
476 }
477
478 return TRUE;
479 }
480 \f
481 /* Functions for the i386 ELF linker.
482
483 In order to gain some understanding of code in this file without
484 knowing all the intricate details of the linker, note the
485 following:
486
487 Functions named elf_i386_* are called by external routines, other
488 functions are only called locally. elf_i386_* functions appear
489 in this file more or less in the order in which they are called
490 from external routines. eg. elf_i386_check_relocs is called
491 early in the link process, elf_i386_finish_dynamic_sections is
492 one of the last functions. */
493
494
495 /* The name of the dynamic interpreter. This is put in the .interp
496 section. */
497
498 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
499
500 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
501 copying dynamic variables from a shared lib into an app's dynbss
502 section, and instead use a dynamic relocation to point into the
503 shared lib. */
504 #define ELIMINATE_COPY_RELOCS 1
505
506 /* The size in bytes of an entry in the procedure linkage table. */
507
508 #define PLT_ENTRY_SIZE 16
509
510 /* The first entry in an absolute procedure linkage table looks like
511 this. See the SVR4 ABI i386 supplement to see how this works.
512 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
513
514 static const bfd_byte elf_i386_plt0_entry[12] =
515 {
516 0xff, 0x35, /* pushl contents of address */
517 0, 0, 0, 0, /* replaced with address of .got + 4. */
518 0xff, 0x25, /* jmp indirect */
519 0, 0, 0, 0 /* replaced with address of .got + 8. */
520 };
521
522 /* Subsequent entries in an absolute procedure linkage table look like
523 this. */
524
525 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
526 {
527 0xff, 0x25, /* jmp indirect */
528 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
529 0x68, /* pushl immediate */
530 0, 0, 0, 0, /* replaced with offset into relocation table. */
531 0xe9, /* jmp relative */
532 0, 0, 0, 0 /* replaced with offset to start of .plt. */
533 };
534
535 /* The first entry in a PIC procedure linkage table look like this.
536 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
537
538 static const bfd_byte elf_i386_pic_plt0_entry[12] =
539 {
540 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
541 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
542 };
543
544 /* Subsequent entries in a PIC procedure linkage table look like this. */
545
546 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
547 {
548 0xff, 0xa3, /* jmp *offset(%ebx) */
549 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
550 0x68, /* pushl immediate */
551 0, 0, 0, 0, /* replaced with offset into relocation table. */
552 0xe9, /* jmp relative */
553 0, 0, 0, 0 /* replaced with offset to start of .plt. */
554 };
555
556 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
557 for the PLTResolve stub and then for each PLT entry. */
558 #define PLTRESOLVE_RELOCS_SHLIB 0
559 #define PLTRESOLVE_RELOCS 2
560 #define PLT_NON_JUMP_SLOT_RELOCS 2
561
562 /* The i386 linker needs to keep track of the number of relocs that it
563 decides to copy as dynamic relocs in check_relocs for each symbol.
564 This is so that it can later discard them if they are found to be
565 unnecessary. We store the information in a field extending the
566 regular ELF linker hash table. */
567
568 struct elf_i386_dyn_relocs
569 {
570 struct elf_i386_dyn_relocs *next;
571
572 /* The input section of the reloc. */
573 asection *sec;
574
575 /* Total number of relocs copied for the input section. */
576 bfd_size_type count;
577
578 /* Number of pc-relative relocs copied for the input section. */
579 bfd_size_type pc_count;
580 };
581
582 /* i386 ELF linker hash entry. */
583
584 struct elf_i386_link_hash_entry
585 {
586 struct elf_link_hash_entry elf;
587
588 /* Track dynamic relocs copied for this symbol. */
589 struct elf_i386_dyn_relocs *dyn_relocs;
590
591 #define GOT_UNKNOWN 0
592 #define GOT_NORMAL 1
593 #define GOT_TLS_GD 2
594 #define GOT_TLS_IE 4
595 #define GOT_TLS_IE_POS 5
596 #define GOT_TLS_IE_NEG 6
597 #define GOT_TLS_IE_BOTH 7
598 #define GOT_TLS_GDESC 8
599 #define GOT_TLS_GD_BOTH_P(type) \
600 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
601 #define GOT_TLS_GD_P(type) \
602 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
603 #define GOT_TLS_GDESC_P(type) \
604 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
605 #define GOT_TLS_GD_ANY_P(type) \
606 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
607 unsigned char tls_type;
608
609 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
610 starting at the end of the jump table. */
611 bfd_vma tlsdesc_got;
612 };
613
614 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
615
616 struct elf_i386_obj_tdata
617 {
618 struct elf_obj_tdata root;
619
620 /* tls_type for each local got entry. */
621 char *local_got_tls_type;
622
623 /* GOTPLT entries for TLS descriptors. */
624 bfd_vma *local_tlsdesc_gotent;
625 };
626
627 #define elf_i386_tdata(abfd) \
628 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
629
630 #define elf_i386_local_got_tls_type(abfd) \
631 (elf_i386_tdata (abfd)->local_got_tls_type)
632
633 #define elf_i386_local_tlsdesc_gotent(abfd) \
634 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
635
636 static bfd_boolean
637 elf_i386_mkobject (bfd *abfd)
638 {
639 if (abfd->tdata.any == NULL)
640 {
641 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
642 abfd->tdata.any = bfd_zalloc (abfd, amt);
643 if (abfd->tdata.any == NULL)
644 return FALSE;
645 }
646 return bfd_elf_mkobject (abfd);
647 }
648
649 /* i386 ELF linker hash table. */
650
651 struct elf_i386_link_hash_table
652 {
653 struct elf_link_hash_table elf;
654
655 /* Short-cuts to get to dynamic linker sections. */
656 asection *sgot;
657 asection *sgotplt;
658 asection *srelgot;
659 asection *splt;
660 asection *srelplt;
661 asection *sdynbss;
662 asection *srelbss;
663
664 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
665 asection *srelplt2;
666
667 /* True if the target system is VxWorks. */
668 int is_vxworks;
669
670 /* Value used to fill the last word of the first plt entry. */
671 bfd_byte plt0_pad_byte;
672
673 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
674 bfd_vma next_tls_desc_index;
675
676 union {
677 bfd_signed_vma refcount;
678 bfd_vma offset;
679 } tls_ldm_got;
680
681 /* The amount of space used by the reserved portion of the sgotplt
682 section, plus whatever space is used by the jump slots. */
683 bfd_vma sgotplt_jump_table_size;
684
685 /* Small local sym to section mapping cache. */
686 struct sym_sec_cache sym_sec;
687 };
688
689 /* Get the i386 ELF linker hash table from a link_info structure. */
690
691 #define elf_i386_hash_table(p) \
692 ((struct elf_i386_link_hash_table *) ((p)->hash))
693
694 #define elf_i386_compute_jump_table_size(htab) \
695 ((htab)->next_tls_desc_index * 4)
696
697 /* Create an entry in an i386 ELF linker hash table. */
698
699 static struct bfd_hash_entry *
700 link_hash_newfunc (struct bfd_hash_entry *entry,
701 struct bfd_hash_table *table,
702 const char *string)
703 {
704 /* Allocate the structure if it has not already been allocated by a
705 subclass. */
706 if (entry == NULL)
707 {
708 entry = bfd_hash_allocate (table,
709 sizeof (struct elf_i386_link_hash_entry));
710 if (entry == NULL)
711 return entry;
712 }
713
714 /* Call the allocation method of the superclass. */
715 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
716 if (entry != NULL)
717 {
718 struct elf_i386_link_hash_entry *eh;
719
720 eh = (struct elf_i386_link_hash_entry *) entry;
721 eh->dyn_relocs = NULL;
722 eh->tls_type = GOT_UNKNOWN;
723 eh->tlsdesc_got = (bfd_vma) -1;
724 }
725
726 return entry;
727 }
728
729 /* Create an i386 ELF linker hash table. */
730
731 static struct bfd_link_hash_table *
732 elf_i386_link_hash_table_create (bfd *abfd)
733 {
734 struct elf_i386_link_hash_table *ret;
735 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
736
737 ret = bfd_malloc (amt);
738 if (ret == NULL)
739 return NULL;
740
741 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc,
742 sizeof (struct elf_i386_link_hash_entry)))
743 {
744 free (ret);
745 return NULL;
746 }
747
748 ret->sgot = NULL;
749 ret->sgotplt = NULL;
750 ret->srelgot = NULL;
751 ret->splt = NULL;
752 ret->srelplt = NULL;
753 ret->sdynbss = NULL;
754 ret->srelbss = NULL;
755 ret->tls_ldm_got.refcount = 0;
756 ret->next_tls_desc_index = 0;
757 ret->sgotplt_jump_table_size = 0;
758 ret->sym_sec.abfd = NULL;
759 ret->is_vxworks = 0;
760 ret->srelplt2 = NULL;
761 ret->plt0_pad_byte = 0;
762
763 return &ret->elf.root;
764 }
765
766 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
767 shortcuts to them in our hash table. */
768
769 static bfd_boolean
770 create_got_section (bfd *dynobj, struct bfd_link_info *info)
771 {
772 struct elf_i386_link_hash_table *htab;
773
774 if (! _bfd_elf_create_got_section (dynobj, info))
775 return FALSE;
776
777 htab = elf_i386_hash_table (info);
778 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
779 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
780 if (!htab->sgot || !htab->sgotplt)
781 abort ();
782
783 htab->srelgot = bfd_make_section_with_flags (dynobj, ".rel.got",
784 (SEC_ALLOC | SEC_LOAD
785 | SEC_HAS_CONTENTS
786 | SEC_IN_MEMORY
787 | SEC_LINKER_CREATED
788 | SEC_READONLY));
789 if (htab->srelgot == NULL
790 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
791 return FALSE;
792 return TRUE;
793 }
794
795 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
796 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
797 hash table. */
798
799 static bfd_boolean
800 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
801 {
802 struct elf_i386_link_hash_table *htab;
803
804 htab = elf_i386_hash_table (info);
805 if (!htab->sgot && !create_got_section (dynobj, info))
806 return FALSE;
807
808 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
809 return FALSE;
810
811 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
812 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
813 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
814 if (!info->shared)
815 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
816
817 if (!htab->splt || !htab->srelplt || !htab->sdynbss
818 || (!info->shared && !htab->srelbss))
819 abort ();
820
821 if (htab->is_vxworks
822 && !elf_vxworks_create_dynamic_sections (dynobj, info, &htab->srelplt2))
823 return FALSE;
824
825 return TRUE;
826 }
827
828 /* Copy the extra info we tack onto an elf_link_hash_entry. */
829
830 static void
831 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
832 struct elf_link_hash_entry *dir,
833 struct elf_link_hash_entry *ind)
834 {
835 struct elf_i386_link_hash_entry *edir, *eind;
836
837 edir = (struct elf_i386_link_hash_entry *) dir;
838 eind = (struct elf_i386_link_hash_entry *) ind;
839
840 if (eind->dyn_relocs != NULL)
841 {
842 if (edir->dyn_relocs != NULL)
843 {
844 struct elf_i386_dyn_relocs **pp;
845 struct elf_i386_dyn_relocs *p;
846
847 /* Add reloc counts against the indirect sym to the direct sym
848 list. Merge any entries against the same section. */
849 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
850 {
851 struct elf_i386_dyn_relocs *q;
852
853 for (q = edir->dyn_relocs; q != NULL; q = q->next)
854 if (q->sec == p->sec)
855 {
856 q->pc_count += p->pc_count;
857 q->count += p->count;
858 *pp = p->next;
859 break;
860 }
861 if (q == NULL)
862 pp = &p->next;
863 }
864 *pp = edir->dyn_relocs;
865 }
866
867 edir->dyn_relocs = eind->dyn_relocs;
868 eind->dyn_relocs = NULL;
869 }
870
871 if (ind->root.type == bfd_link_hash_indirect
872 && dir->got.refcount <= 0)
873 {
874 edir->tls_type = eind->tls_type;
875 eind->tls_type = GOT_UNKNOWN;
876 }
877
878 if (ELIMINATE_COPY_RELOCS
879 && ind->root.type != bfd_link_hash_indirect
880 && dir->dynamic_adjusted)
881 {
882 /* If called to transfer flags for a weakdef during processing
883 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
884 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
885 dir->ref_dynamic |= ind->ref_dynamic;
886 dir->ref_regular |= ind->ref_regular;
887 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
888 dir->needs_plt |= ind->needs_plt;
889 dir->pointer_equality_needed |= ind->pointer_equality_needed;
890 }
891 else
892 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
893 }
894
895 static int
896 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
897 {
898 if (info->shared)
899 return r_type;
900
901 switch (r_type)
902 {
903 case R_386_TLS_GD:
904 case R_386_TLS_GOTDESC:
905 case R_386_TLS_DESC_CALL:
906 case R_386_TLS_IE_32:
907 if (is_local)
908 return R_386_TLS_LE_32;
909 return R_386_TLS_IE_32;
910 case R_386_TLS_IE:
911 case R_386_TLS_GOTIE:
912 if (is_local)
913 return R_386_TLS_LE_32;
914 return r_type;
915 case R_386_TLS_LDM:
916 return R_386_TLS_LE_32;
917 }
918
919 return r_type;
920 }
921
922 /* Look through the relocs for a section during the first phase, and
923 calculate needed space in the global offset table, procedure linkage
924 table, and dynamic reloc sections. */
925
926 static bfd_boolean
927 elf_i386_check_relocs (bfd *abfd,
928 struct bfd_link_info *info,
929 asection *sec,
930 const Elf_Internal_Rela *relocs)
931 {
932 struct elf_i386_link_hash_table *htab;
933 Elf_Internal_Shdr *symtab_hdr;
934 struct elf_link_hash_entry **sym_hashes;
935 const Elf_Internal_Rela *rel;
936 const Elf_Internal_Rela *rel_end;
937 asection *sreloc;
938
939 if (info->relocatable)
940 return TRUE;
941
942 htab = elf_i386_hash_table (info);
943 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
944 sym_hashes = elf_sym_hashes (abfd);
945
946 sreloc = NULL;
947
948 rel_end = relocs + sec->reloc_count;
949 for (rel = relocs; rel < rel_end; rel++)
950 {
951 unsigned int r_type;
952 unsigned long r_symndx;
953 struct elf_link_hash_entry *h;
954
955 r_symndx = ELF32_R_SYM (rel->r_info);
956 r_type = ELF32_R_TYPE (rel->r_info);
957
958 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
959 {
960 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
961 abfd,
962 r_symndx);
963 return FALSE;
964 }
965
966 if (r_symndx < symtab_hdr->sh_info)
967 h = NULL;
968 else
969 {
970 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
971 while (h->root.type == bfd_link_hash_indirect
972 || h->root.type == bfd_link_hash_warning)
973 h = (struct elf_link_hash_entry *) h->root.u.i.link;
974 }
975
976 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
977
978 switch (r_type)
979 {
980 case R_386_TLS_LDM:
981 htab->tls_ldm_got.refcount += 1;
982 goto create_got;
983
984 case R_386_PLT32:
985 /* This symbol requires a procedure linkage table entry. We
986 actually build the entry in adjust_dynamic_symbol,
987 because this might be a case of linking PIC code which is
988 never referenced by a dynamic object, in which case we
989 don't need to generate a procedure linkage table entry
990 after all. */
991
992 /* If this is a local symbol, we resolve it directly without
993 creating a procedure linkage table entry. */
994 if (h == NULL)
995 continue;
996
997 h->needs_plt = 1;
998 h->plt.refcount += 1;
999 break;
1000
1001 case R_386_TLS_IE_32:
1002 case R_386_TLS_IE:
1003 case R_386_TLS_GOTIE:
1004 if (info->shared)
1005 info->flags |= DF_STATIC_TLS;
1006 /* Fall through */
1007
1008 case R_386_GOT32:
1009 case R_386_TLS_GD:
1010 case R_386_TLS_GOTDESC:
1011 case R_386_TLS_DESC_CALL:
1012 /* This symbol requires a global offset table entry. */
1013 {
1014 int tls_type, old_tls_type;
1015
1016 switch (r_type)
1017 {
1018 default:
1019 case R_386_GOT32: tls_type = GOT_NORMAL; break;
1020 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1021 case R_386_TLS_GOTDESC:
1022 case R_386_TLS_DESC_CALL:
1023 tls_type = GOT_TLS_GDESC; break;
1024 case R_386_TLS_IE_32:
1025 if (ELF32_R_TYPE (rel->r_info) == r_type)
1026 tls_type = GOT_TLS_IE_NEG;
1027 else
1028 /* If this is a GD->IE transition, we may use either of
1029 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1030 tls_type = GOT_TLS_IE;
1031 break;
1032 case R_386_TLS_IE:
1033 case R_386_TLS_GOTIE:
1034 tls_type = GOT_TLS_IE_POS; break;
1035 }
1036
1037 if (h != NULL)
1038 {
1039 h->got.refcount += 1;
1040 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1041 }
1042 else
1043 {
1044 bfd_signed_vma *local_got_refcounts;
1045
1046 /* This is a global offset table entry for a local symbol. */
1047 local_got_refcounts = elf_local_got_refcounts (abfd);
1048 if (local_got_refcounts == NULL)
1049 {
1050 bfd_size_type size;
1051
1052 size = symtab_hdr->sh_info;
1053 size *= (sizeof (bfd_signed_vma)
1054 + sizeof (bfd_vma) + sizeof(char));
1055 local_got_refcounts = bfd_zalloc (abfd, size);
1056 if (local_got_refcounts == NULL)
1057 return FALSE;
1058 elf_local_got_refcounts (abfd) = local_got_refcounts;
1059 elf_i386_local_tlsdesc_gotent (abfd)
1060 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1061 elf_i386_local_got_tls_type (abfd)
1062 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1063 }
1064 local_got_refcounts[r_symndx] += 1;
1065 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1066 }
1067
1068 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1069 tls_type |= old_tls_type;
1070 /* If a TLS symbol is accessed using IE at least once,
1071 there is no point to use dynamic model for it. */
1072 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1073 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1074 || (tls_type & GOT_TLS_IE) == 0))
1075 {
1076 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1077 tls_type = old_tls_type;
1078 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1079 && GOT_TLS_GD_ANY_P (tls_type))
1080 tls_type |= old_tls_type;
1081 else
1082 {
1083 (*_bfd_error_handler)
1084 (_("%B: `%s' accessed both as normal and "
1085 "thread local symbol"),
1086 abfd,
1087 h ? h->root.root.string : "<local>");
1088 return FALSE;
1089 }
1090 }
1091
1092 if (old_tls_type != tls_type)
1093 {
1094 if (h != NULL)
1095 elf_i386_hash_entry (h)->tls_type = tls_type;
1096 else
1097 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1098 }
1099 }
1100 /* Fall through */
1101
1102 case R_386_GOTOFF:
1103 case R_386_GOTPC:
1104 create_got:
1105 if (htab->sgot == NULL)
1106 {
1107 if (htab->elf.dynobj == NULL)
1108 htab->elf.dynobj = abfd;
1109 if (!create_got_section (htab->elf.dynobj, info))
1110 return FALSE;
1111 }
1112 if (r_type != R_386_TLS_IE)
1113 break;
1114 /* Fall through */
1115
1116 case R_386_TLS_LE_32:
1117 case R_386_TLS_LE:
1118 if (!info->shared)
1119 break;
1120 info->flags |= DF_STATIC_TLS;
1121 /* Fall through */
1122
1123 case R_386_32:
1124 case R_386_PC32:
1125 if (h != NULL && !info->shared)
1126 {
1127 /* If this reloc is in a read-only section, we might
1128 need a copy reloc. We can't check reliably at this
1129 stage whether the section is read-only, as input
1130 sections have not yet been mapped to output sections.
1131 Tentatively set the flag for now, and correct in
1132 adjust_dynamic_symbol. */
1133 h->non_got_ref = 1;
1134
1135 /* We may need a .plt entry if the function this reloc
1136 refers to is in a shared lib. */
1137 h->plt.refcount += 1;
1138 if (r_type != R_386_PC32)
1139 h->pointer_equality_needed = 1;
1140 }
1141
1142 /* If we are creating a shared library, and this is a reloc
1143 against a global symbol, or a non PC relative reloc
1144 against a local symbol, then we need to copy the reloc
1145 into the shared library. However, if we are linking with
1146 -Bsymbolic, we do not need to copy a reloc against a
1147 global symbol which is defined in an object we are
1148 including in the link (i.e., DEF_REGULAR is set). At
1149 this point we have not seen all the input files, so it is
1150 possible that DEF_REGULAR is not set now but will be set
1151 later (it is never cleared). In case of a weak definition,
1152 DEF_REGULAR may be cleared later by a strong definition in
1153 a shared library. We account for that possibility below by
1154 storing information in the relocs_copied field of the hash
1155 table entry. A similar situation occurs when creating
1156 shared libraries and symbol visibility changes render the
1157 symbol local.
1158
1159 If on the other hand, we are creating an executable, we
1160 may need to keep relocations for symbols satisfied by a
1161 dynamic library if we manage to avoid copy relocs for the
1162 symbol. */
1163 if ((info->shared
1164 && (sec->flags & SEC_ALLOC) != 0
1165 && (r_type != R_386_PC32
1166 || (h != NULL
1167 && (! SYMBOLIC_BIND (info, h)
1168 || h->root.type == bfd_link_hash_defweak
1169 || !h->def_regular))))
1170 || (ELIMINATE_COPY_RELOCS
1171 && !info->shared
1172 && (sec->flags & SEC_ALLOC) != 0
1173 && h != NULL
1174 && (h->root.type == bfd_link_hash_defweak
1175 || !h->def_regular)))
1176 {
1177 struct elf_i386_dyn_relocs *p;
1178 struct elf_i386_dyn_relocs **head;
1179
1180 /* We must copy these reloc types into the output file.
1181 Create a reloc section in dynobj and make room for
1182 this reloc. */
1183 if (sreloc == NULL)
1184 {
1185 const char *name;
1186 bfd *dynobj;
1187 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1188 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1189
1190 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1191 if (name == NULL)
1192 return FALSE;
1193
1194 if (! CONST_STRNEQ (name, ".rel")
1195 || strcmp (bfd_get_section_name (abfd, sec),
1196 name + 4) != 0)
1197 {
1198 (*_bfd_error_handler)
1199 (_("%B: bad relocation section name `%s\'"),
1200 abfd, name);
1201 }
1202
1203 if (htab->elf.dynobj == NULL)
1204 htab->elf.dynobj = abfd;
1205
1206 dynobj = htab->elf.dynobj;
1207 sreloc = bfd_get_section_by_name (dynobj, name);
1208 if (sreloc == NULL)
1209 {
1210 flagword flags;
1211
1212 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1213 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1214 if ((sec->flags & SEC_ALLOC) != 0)
1215 flags |= SEC_ALLOC | SEC_LOAD;
1216 sreloc = bfd_make_section_with_flags (dynobj,
1217 name,
1218 flags);
1219 if (sreloc == NULL
1220 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1221 return FALSE;
1222 }
1223 elf_section_data (sec)->sreloc = sreloc;
1224 }
1225
1226 /* If this is a global symbol, we count the number of
1227 relocations we need for this symbol. */
1228 if (h != NULL)
1229 {
1230 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1231 }
1232 else
1233 {
1234 void **vpp;
1235 /* Track dynamic relocs needed for local syms too.
1236 We really need local syms available to do this
1237 easily. Oh well. */
1238
1239 asection *s;
1240 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1241 sec, r_symndx);
1242 if (s == NULL)
1243 return FALSE;
1244
1245 vpp = &elf_section_data (s)->local_dynrel;
1246 head = (struct elf_i386_dyn_relocs **)vpp;
1247 }
1248
1249 p = *head;
1250 if (p == NULL || p->sec != sec)
1251 {
1252 bfd_size_type amt = sizeof *p;
1253 p = bfd_alloc (htab->elf.dynobj, amt);
1254 if (p == NULL)
1255 return FALSE;
1256 p->next = *head;
1257 *head = p;
1258 p->sec = sec;
1259 p->count = 0;
1260 p->pc_count = 0;
1261 }
1262
1263 p->count += 1;
1264 if (r_type == R_386_PC32)
1265 p->pc_count += 1;
1266 }
1267 break;
1268
1269 /* This relocation describes the C++ object vtable hierarchy.
1270 Reconstruct it for later use during GC. */
1271 case R_386_GNU_VTINHERIT:
1272 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1273 return FALSE;
1274 break;
1275
1276 /* This relocation describes which C++ vtable entries are actually
1277 used. Record for later use during GC. */
1278 case R_386_GNU_VTENTRY:
1279 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1280 return FALSE;
1281 break;
1282
1283 default:
1284 break;
1285 }
1286 }
1287
1288 return TRUE;
1289 }
1290
1291 /* Return the section that should be marked against GC for a given
1292 relocation. */
1293
1294 static asection *
1295 elf_i386_gc_mark_hook (asection *sec,
1296 struct bfd_link_info *info,
1297 Elf_Internal_Rela *rel,
1298 struct elf_link_hash_entry *h,
1299 Elf_Internal_Sym *sym)
1300 {
1301 if (h != NULL)
1302 switch (ELF32_R_TYPE (rel->r_info))
1303 {
1304 case R_386_GNU_VTINHERIT:
1305 case R_386_GNU_VTENTRY:
1306 return NULL;
1307 }
1308
1309 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1310 }
1311
1312 /* Update the got entry reference counts for the section being removed. */
1313
1314 static bfd_boolean
1315 elf_i386_gc_sweep_hook (bfd *abfd,
1316 struct bfd_link_info *info,
1317 asection *sec,
1318 const Elf_Internal_Rela *relocs)
1319 {
1320 Elf_Internal_Shdr *symtab_hdr;
1321 struct elf_link_hash_entry **sym_hashes;
1322 bfd_signed_vma *local_got_refcounts;
1323 const Elf_Internal_Rela *rel, *relend;
1324
1325 elf_section_data (sec)->local_dynrel = NULL;
1326
1327 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1328 sym_hashes = elf_sym_hashes (abfd);
1329 local_got_refcounts = elf_local_got_refcounts (abfd);
1330
1331 relend = relocs + sec->reloc_count;
1332 for (rel = relocs; rel < relend; rel++)
1333 {
1334 unsigned long r_symndx;
1335 unsigned int r_type;
1336 struct elf_link_hash_entry *h = NULL;
1337
1338 r_symndx = ELF32_R_SYM (rel->r_info);
1339 if (r_symndx >= symtab_hdr->sh_info)
1340 {
1341 struct elf_i386_link_hash_entry *eh;
1342 struct elf_i386_dyn_relocs **pp;
1343 struct elf_i386_dyn_relocs *p;
1344
1345 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1346 while (h->root.type == bfd_link_hash_indirect
1347 || h->root.type == bfd_link_hash_warning)
1348 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1349 eh = (struct elf_i386_link_hash_entry *) h;
1350
1351 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1352 if (p->sec == sec)
1353 {
1354 /* Everything must go for SEC. */
1355 *pp = p->next;
1356 break;
1357 }
1358 }
1359
1360 r_type = ELF32_R_TYPE (rel->r_info);
1361 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1362 switch (r_type)
1363 {
1364 case R_386_TLS_LDM:
1365 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1366 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1367 break;
1368
1369 case R_386_TLS_GD:
1370 case R_386_TLS_GOTDESC:
1371 case R_386_TLS_DESC_CALL:
1372 case R_386_TLS_IE_32:
1373 case R_386_TLS_IE:
1374 case R_386_TLS_GOTIE:
1375 case R_386_GOT32:
1376 if (h != NULL)
1377 {
1378 if (h->got.refcount > 0)
1379 h->got.refcount -= 1;
1380 }
1381 else if (local_got_refcounts != NULL)
1382 {
1383 if (local_got_refcounts[r_symndx] > 0)
1384 local_got_refcounts[r_symndx] -= 1;
1385 }
1386 break;
1387
1388 case R_386_32:
1389 case R_386_PC32:
1390 if (info->shared)
1391 break;
1392 /* Fall through */
1393
1394 case R_386_PLT32:
1395 if (h != NULL)
1396 {
1397 if (h->plt.refcount > 0)
1398 h->plt.refcount -= 1;
1399 }
1400 break;
1401
1402 default:
1403 break;
1404 }
1405 }
1406
1407 return TRUE;
1408 }
1409
1410 /* Adjust a symbol defined by a dynamic object and referenced by a
1411 regular object. The current definition is in some section of the
1412 dynamic object, but we're not including those sections. We have to
1413 change the definition to something the rest of the link can
1414 understand. */
1415
1416 static bfd_boolean
1417 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1418 struct elf_link_hash_entry *h)
1419 {
1420 struct elf_i386_link_hash_table *htab;
1421 asection *s;
1422 unsigned int power_of_two;
1423
1424 /* If this is a function, put it in the procedure linkage table. We
1425 will fill in the contents of the procedure linkage table later,
1426 when we know the address of the .got section. */
1427 if (h->type == STT_FUNC
1428 || h->needs_plt)
1429 {
1430 if (h->plt.refcount <= 0
1431 || SYMBOL_CALLS_LOCAL (info, h)
1432 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1433 && h->root.type == bfd_link_hash_undefweak))
1434 {
1435 /* This case can occur if we saw a PLT32 reloc in an input
1436 file, but the symbol was never referred to by a dynamic
1437 object, or if all references were garbage collected. In
1438 such a case, we don't actually need to build a procedure
1439 linkage table, and we can just do a PC32 reloc instead. */
1440 h->plt.offset = (bfd_vma) -1;
1441 h->needs_plt = 0;
1442 }
1443
1444 return TRUE;
1445 }
1446 else
1447 /* It's possible that we incorrectly decided a .plt reloc was
1448 needed for an R_386_PC32 reloc to a non-function sym in
1449 check_relocs. We can't decide accurately between function and
1450 non-function syms in check-relocs; Objects loaded later in
1451 the link may change h->type. So fix it now. */
1452 h->plt.offset = (bfd_vma) -1;
1453
1454 /* If this is a weak symbol, and there is a real definition, the
1455 processor independent code will have arranged for us to see the
1456 real definition first, and we can just use the same value. */
1457 if (h->u.weakdef != NULL)
1458 {
1459 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
1460 || h->u.weakdef->root.type == bfd_link_hash_defweak);
1461 h->root.u.def.section = h->u.weakdef->root.u.def.section;
1462 h->root.u.def.value = h->u.weakdef->root.u.def.value;
1463 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1464 h->non_got_ref = h->u.weakdef->non_got_ref;
1465 return TRUE;
1466 }
1467
1468 /* This is a reference to a symbol defined by a dynamic object which
1469 is not a function. */
1470
1471 /* If we are creating a shared library, we must presume that the
1472 only references to the symbol are via the global offset table.
1473 For such cases we need not do anything here; the relocations will
1474 be handled correctly by relocate_section. */
1475 if (info->shared)
1476 return TRUE;
1477
1478 /* If there are no references to this symbol that do not use the
1479 GOT, we don't need to generate a copy reloc. */
1480 if (!h->non_got_ref)
1481 return TRUE;
1482
1483 /* If -z nocopyreloc was given, we won't generate them either. */
1484 if (info->nocopyreloc)
1485 {
1486 h->non_got_ref = 0;
1487 return TRUE;
1488 }
1489
1490 htab = elf_i386_hash_table (info);
1491
1492 /* If there aren't any dynamic relocs in read-only sections, then
1493 we can keep the dynamic relocs and avoid the copy reloc. This
1494 doesn't work on VxWorks, where we can not have dynamic relocations
1495 (other than copy and jump slot relocations) in an executable. */
1496 if (ELIMINATE_COPY_RELOCS && !htab->is_vxworks)
1497 {
1498 struct elf_i386_link_hash_entry * eh;
1499 struct elf_i386_dyn_relocs *p;
1500
1501 eh = (struct elf_i386_link_hash_entry *) h;
1502 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1503 {
1504 s = p->sec->output_section;
1505 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1506 break;
1507 }
1508
1509 if (p == NULL)
1510 {
1511 h->non_got_ref = 0;
1512 return TRUE;
1513 }
1514 }
1515
1516 if (h->size == 0)
1517 {
1518 (*_bfd_error_handler) (_("dynamic variable `%s' is zero size"),
1519 h->root.root.string);
1520 return TRUE;
1521 }
1522
1523 /* We must allocate the symbol in our .dynbss section, which will
1524 become part of the .bss section of the executable. There will be
1525 an entry for this symbol in the .dynsym section. The dynamic
1526 object will contain position independent code, so all references
1527 from the dynamic object to this symbol will go through the global
1528 offset table. The dynamic linker will use the .dynsym entry to
1529 determine the address it must put in the global offset table, so
1530 both the dynamic object and the regular object will refer to the
1531 same memory location for the variable. */
1532
1533 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1534 copy the initial value out of the dynamic object and into the
1535 runtime process image. */
1536 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1537 {
1538 htab->srelbss->size += sizeof (Elf32_External_Rel);
1539 h->needs_copy = 1;
1540 }
1541
1542 /* We need to figure out the alignment required for this symbol. I
1543 have no idea how ELF linkers handle this. */
1544 power_of_two = bfd_log2 (h->size);
1545 if (power_of_two > 3)
1546 power_of_two = 3;
1547
1548 /* Apply the required alignment. */
1549 s = htab->sdynbss;
1550 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1551 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1552 {
1553 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1554 return FALSE;
1555 }
1556
1557 /* Define the symbol as being at this point in the section. */
1558 h->root.u.def.section = s;
1559 h->root.u.def.value = s->size;
1560
1561 /* Increment the section size to make room for the symbol. */
1562 s->size += h->size;
1563
1564 return TRUE;
1565 }
1566
1567 /* Allocate space in .plt, .got and associated reloc sections for
1568 dynamic relocs. */
1569
1570 static bfd_boolean
1571 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1572 {
1573 struct bfd_link_info *info;
1574 struct elf_i386_link_hash_table *htab;
1575 struct elf_i386_link_hash_entry *eh;
1576 struct elf_i386_dyn_relocs *p;
1577
1578 if (h->root.type == bfd_link_hash_indirect)
1579 return TRUE;
1580
1581 if (h->root.type == bfd_link_hash_warning)
1582 /* When warning symbols are created, they **replace** the "real"
1583 entry in the hash table, thus we never get to see the real
1584 symbol in a hash traversal. So look at it now. */
1585 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1586
1587 info = (struct bfd_link_info *) inf;
1588 htab = elf_i386_hash_table (info);
1589
1590 if (htab->elf.dynamic_sections_created
1591 && h->plt.refcount > 0)
1592 {
1593 /* Make sure this symbol is output as a dynamic symbol.
1594 Undefined weak syms won't yet be marked as dynamic. */
1595 if (h->dynindx == -1
1596 && !h->forced_local)
1597 {
1598 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1599 return FALSE;
1600 }
1601
1602 if (info->shared
1603 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1604 {
1605 asection *s = htab->splt;
1606
1607 /* If this is the first .plt entry, make room for the special
1608 first entry. */
1609 if (s->size == 0)
1610 s->size += PLT_ENTRY_SIZE;
1611
1612 h->plt.offset = s->size;
1613
1614 /* If this symbol is not defined in a regular file, and we are
1615 not generating a shared library, then set the symbol to this
1616 location in the .plt. This is required to make function
1617 pointers compare as equal between the normal executable and
1618 the shared library. */
1619 if (! info->shared
1620 && !h->def_regular)
1621 {
1622 h->root.u.def.section = s;
1623 h->root.u.def.value = h->plt.offset;
1624 }
1625
1626 /* Make room for this entry. */
1627 s->size += PLT_ENTRY_SIZE;
1628
1629 /* We also need to make an entry in the .got.plt section, which
1630 will be placed in the .got section by the linker script. */
1631 htab->sgotplt->size += 4;
1632
1633 /* We also need to make an entry in the .rel.plt section. */
1634 htab->srelplt->size += sizeof (Elf32_External_Rel);
1635 htab->next_tls_desc_index++;
1636
1637 if (htab->is_vxworks && !info->shared)
1638 {
1639 /* VxWorks has a second set of relocations for each PLT entry
1640 in executables. They go in a separate relocation section,
1641 which is processed by the kernel loader. */
1642
1643 /* There are two relocations for the initial PLT entry: an
1644 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
1645 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
1646
1647 if (h->plt.offset == PLT_ENTRY_SIZE)
1648 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1649
1650 /* There are two extra relocations for each subsequent PLT entry:
1651 an R_386_32 relocation for the GOT entry, and an R_386_32
1652 relocation for the PLT entry. */
1653
1654 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
1655 }
1656 }
1657 else
1658 {
1659 h->plt.offset = (bfd_vma) -1;
1660 h->needs_plt = 0;
1661 }
1662 }
1663 else
1664 {
1665 h->plt.offset = (bfd_vma) -1;
1666 h->needs_plt = 0;
1667 }
1668
1669 eh = (struct elf_i386_link_hash_entry *) h;
1670 eh->tlsdesc_got = (bfd_vma) -1;
1671
1672 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1673 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1674 if (h->got.refcount > 0
1675 && !info->shared
1676 && h->dynindx == -1
1677 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1678 h->got.offset = (bfd_vma) -1;
1679 else if (h->got.refcount > 0)
1680 {
1681 asection *s;
1682 bfd_boolean dyn;
1683 int tls_type = elf_i386_hash_entry(h)->tls_type;
1684
1685 /* Make sure this symbol is output as a dynamic symbol.
1686 Undefined weak syms won't yet be marked as dynamic. */
1687 if (h->dynindx == -1
1688 && !h->forced_local)
1689 {
1690 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1691 return FALSE;
1692 }
1693
1694 s = htab->sgot;
1695 if (GOT_TLS_GDESC_P (tls_type))
1696 {
1697 eh->tlsdesc_got = htab->sgotplt->size
1698 - elf_i386_compute_jump_table_size (htab);
1699 htab->sgotplt->size += 8;
1700 h->got.offset = (bfd_vma) -2;
1701 }
1702 if (! GOT_TLS_GDESC_P (tls_type)
1703 || GOT_TLS_GD_P (tls_type))
1704 {
1705 h->got.offset = s->size;
1706 s->size += 4;
1707 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1708 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
1709 s->size += 4;
1710 }
1711 dyn = htab->elf.dynamic_sections_created;
1712 /* R_386_TLS_IE_32 needs one dynamic relocation,
1713 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1714 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1715 need two), R_386_TLS_GD needs one if local symbol and two if
1716 global. */
1717 if (tls_type == GOT_TLS_IE_BOTH)
1718 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1719 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
1720 || (tls_type & GOT_TLS_IE))
1721 htab->srelgot->size += sizeof (Elf32_External_Rel);
1722 else if (GOT_TLS_GD_P (tls_type))
1723 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1724 else if (! GOT_TLS_GDESC_P (tls_type)
1725 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1726 || h->root.type != bfd_link_hash_undefweak)
1727 && (info->shared
1728 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1729 htab->srelgot->size += sizeof (Elf32_External_Rel);
1730 if (GOT_TLS_GDESC_P (tls_type))
1731 htab->srelplt->size += sizeof (Elf32_External_Rel);
1732 }
1733 else
1734 h->got.offset = (bfd_vma) -1;
1735
1736 if (eh->dyn_relocs == NULL)
1737 return TRUE;
1738
1739 /* In the shared -Bsymbolic case, discard space allocated for
1740 dynamic pc-relative relocs against symbols which turn out to be
1741 defined in regular objects. For the normal shared case, discard
1742 space for pc-relative relocs that have become local due to symbol
1743 visibility changes. */
1744
1745 if (info->shared)
1746 {
1747 /* The only reloc that uses pc_count is R_386_PC32, which will
1748 appear on a call or on something like ".long foo - .". We
1749 want calls to protected symbols to resolve directly to the
1750 function rather than going via the plt. If people want
1751 function pointer comparisons to work as expected then they
1752 should avoid writing assembly like ".long foo - .". */
1753 if (SYMBOL_CALLS_LOCAL (info, h))
1754 {
1755 struct elf_i386_dyn_relocs **pp;
1756
1757 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1758 {
1759 p->count -= p->pc_count;
1760 p->pc_count = 0;
1761 if (p->count == 0)
1762 *pp = p->next;
1763 else
1764 pp = &p->next;
1765 }
1766 }
1767
1768 /* Also discard relocs on undefined weak syms with non-default
1769 visibility. */
1770 if (eh->dyn_relocs != NULL
1771 && h->root.type == bfd_link_hash_undefweak)
1772 {
1773 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
1774 eh->dyn_relocs = NULL;
1775
1776 /* Make sure undefined weak symbols are output as a dynamic
1777 symbol in PIEs. */
1778 else if (h->dynindx == -1
1779 && !h->forced_local)
1780 {
1781 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1782 return FALSE;
1783 }
1784 }
1785 }
1786 else if (ELIMINATE_COPY_RELOCS)
1787 {
1788 /* For the non-shared case, discard space for relocs against
1789 symbols which turn out to need copy relocs or are not
1790 dynamic. */
1791
1792 if (!h->non_got_ref
1793 && ((h->def_dynamic
1794 && !h->def_regular)
1795 || (htab->elf.dynamic_sections_created
1796 && (h->root.type == bfd_link_hash_undefweak
1797 || h->root.type == bfd_link_hash_undefined))))
1798 {
1799 /* Make sure this symbol is output as a dynamic symbol.
1800 Undefined weak syms won't yet be marked as dynamic. */
1801 if (h->dynindx == -1
1802 && !h->forced_local)
1803 {
1804 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1805 return FALSE;
1806 }
1807
1808 /* If that succeeded, we know we'll be keeping all the
1809 relocs. */
1810 if (h->dynindx != -1)
1811 goto keep;
1812 }
1813
1814 eh->dyn_relocs = NULL;
1815
1816 keep: ;
1817 }
1818
1819 /* Finally, allocate space. */
1820 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1821 {
1822 asection *sreloc = elf_section_data (p->sec)->sreloc;
1823 sreloc->size += p->count * sizeof (Elf32_External_Rel);
1824 }
1825
1826 return TRUE;
1827 }
1828
1829 /* Find any dynamic relocs that apply to read-only sections. */
1830
1831 static bfd_boolean
1832 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1833 {
1834 struct elf_i386_link_hash_entry *eh;
1835 struct elf_i386_dyn_relocs *p;
1836
1837 if (h->root.type == bfd_link_hash_warning)
1838 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1839
1840 eh = (struct elf_i386_link_hash_entry *) h;
1841 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1842 {
1843 asection *s = p->sec->output_section;
1844
1845 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1846 {
1847 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1848
1849 info->flags |= DF_TEXTREL;
1850
1851 /* Not an error, just cut short the traversal. */
1852 return FALSE;
1853 }
1854 }
1855 return TRUE;
1856 }
1857
1858 /* Set the sizes of the dynamic sections. */
1859
1860 static bfd_boolean
1861 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1862 struct bfd_link_info *info)
1863 {
1864 struct elf_i386_link_hash_table *htab;
1865 bfd *dynobj;
1866 asection *s;
1867 bfd_boolean relocs;
1868 bfd *ibfd;
1869
1870 htab = elf_i386_hash_table (info);
1871 dynobj = htab->elf.dynobj;
1872 if (dynobj == NULL)
1873 abort ();
1874
1875 if (htab->elf.dynamic_sections_created)
1876 {
1877 /* Set the contents of the .interp section to the interpreter. */
1878 if (info->executable)
1879 {
1880 s = bfd_get_section_by_name (dynobj, ".interp");
1881 if (s == NULL)
1882 abort ();
1883 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1884 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1885 }
1886 }
1887
1888 /* Set up .got offsets for local syms, and space for local dynamic
1889 relocs. */
1890 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1891 {
1892 bfd_signed_vma *local_got;
1893 bfd_signed_vma *end_local_got;
1894 char *local_tls_type;
1895 bfd_vma *local_tlsdesc_gotent;
1896 bfd_size_type locsymcount;
1897 Elf_Internal_Shdr *symtab_hdr;
1898 asection *srel;
1899
1900 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1901 continue;
1902
1903 for (s = ibfd->sections; s != NULL; s = s->next)
1904 {
1905 struct elf_i386_dyn_relocs *p;
1906
1907 for (p = ((struct elf_i386_dyn_relocs *)
1908 elf_section_data (s)->local_dynrel);
1909 p != NULL;
1910 p = p->next)
1911 {
1912 if (!bfd_is_abs_section (p->sec)
1913 && bfd_is_abs_section (p->sec->output_section))
1914 {
1915 /* Input section has been discarded, either because
1916 it is a copy of a linkonce section or due to
1917 linker script /DISCARD/, so we'll be discarding
1918 the relocs too. */
1919 }
1920 else if (p->count != 0)
1921 {
1922 srel = elf_section_data (p->sec)->sreloc;
1923 srel->size += p->count * sizeof (Elf32_External_Rel);
1924 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1925 info->flags |= DF_TEXTREL;
1926 }
1927 }
1928 }
1929
1930 local_got = elf_local_got_refcounts (ibfd);
1931 if (!local_got)
1932 continue;
1933
1934 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1935 locsymcount = symtab_hdr->sh_info;
1936 end_local_got = local_got + locsymcount;
1937 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1938 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
1939 s = htab->sgot;
1940 srel = htab->srelgot;
1941 for (; local_got < end_local_got;
1942 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
1943 {
1944 *local_tlsdesc_gotent = (bfd_vma) -1;
1945 if (*local_got > 0)
1946 {
1947 if (GOT_TLS_GDESC_P (*local_tls_type))
1948 {
1949 *local_tlsdesc_gotent = htab->sgotplt->size
1950 - elf_i386_compute_jump_table_size (htab);
1951 htab->sgotplt->size += 8;
1952 *local_got = (bfd_vma) -2;
1953 }
1954 if (! GOT_TLS_GDESC_P (*local_tls_type)
1955 || GOT_TLS_GD_P (*local_tls_type))
1956 {
1957 *local_got = s->size;
1958 s->size += 4;
1959 if (GOT_TLS_GD_P (*local_tls_type)
1960 || *local_tls_type == GOT_TLS_IE_BOTH)
1961 s->size += 4;
1962 }
1963 if (info->shared
1964 || GOT_TLS_GD_ANY_P (*local_tls_type)
1965 || (*local_tls_type & GOT_TLS_IE))
1966 {
1967 if (*local_tls_type == GOT_TLS_IE_BOTH)
1968 srel->size += 2 * sizeof (Elf32_External_Rel);
1969 else if (GOT_TLS_GD_P (*local_tls_type)
1970 || ! GOT_TLS_GDESC_P (*local_tls_type))
1971 srel->size += sizeof (Elf32_External_Rel);
1972 if (GOT_TLS_GDESC_P (*local_tls_type))
1973 htab->srelplt->size += sizeof (Elf32_External_Rel);
1974 }
1975 }
1976 else
1977 *local_got = (bfd_vma) -1;
1978 }
1979 }
1980
1981 if (htab->tls_ldm_got.refcount > 0)
1982 {
1983 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1984 relocs. */
1985 htab->tls_ldm_got.offset = htab->sgot->size;
1986 htab->sgot->size += 8;
1987 htab->srelgot->size += sizeof (Elf32_External_Rel);
1988 }
1989 else
1990 htab->tls_ldm_got.offset = -1;
1991
1992 /* Allocate global sym .plt and .got entries, and space for global
1993 sym dynamic relocs. */
1994 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1995
1996 /* For every jump slot reserved in the sgotplt, reloc_count is
1997 incremented. However, when we reserve space for TLS descriptors,
1998 it's not incremented, so in order to compute the space reserved
1999 for them, it suffices to multiply the reloc count by the jump
2000 slot size. */
2001 if (htab->srelplt)
2002 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
2003
2004 /* We now have determined the sizes of the various dynamic sections.
2005 Allocate memory for them. */
2006 relocs = FALSE;
2007 for (s = dynobj->sections; s != NULL; s = s->next)
2008 {
2009 bfd_boolean strip_section = TRUE;
2010
2011 if ((s->flags & SEC_LINKER_CREATED) == 0)
2012 continue;
2013
2014 if (s == htab->splt
2015 || s == htab->sgot
2016 || s == htab->sgotplt
2017 || s == htab->sdynbss)
2018 {
2019 /* Strip this section if we don't need it; see the
2020 comment below. */
2021 /* We'd like to strip these sections if they aren't needed, but if
2022 we've exported dynamic symbols from them we must leave them.
2023 It's too late to tell BFD to get rid of the symbols. */
2024
2025 if (htab->elf.hplt != NULL)
2026 strip_section = FALSE;
2027 }
2028 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
2029 {
2030 if (s->size != 0 && s != htab->srelplt && s != htab->srelplt2)
2031 relocs = TRUE;
2032
2033 /* We use the reloc_count field as a counter if we need
2034 to copy relocs into the output file. */
2035 s->reloc_count = 0;
2036 }
2037 else
2038 {
2039 /* It's not one of our sections, so don't allocate space. */
2040 continue;
2041 }
2042
2043 if (s->size == 0)
2044 {
2045 /* If we don't need this section, strip it from the
2046 output file. This is mostly to handle .rel.bss and
2047 .rel.plt. We must create both sections in
2048 create_dynamic_sections, because they must be created
2049 before the linker maps input sections to output
2050 sections. The linker does that before
2051 adjust_dynamic_symbol is called, and it is that
2052 function which decides whether anything needs to go
2053 into these sections. */
2054 if (strip_section)
2055 s->flags |= SEC_EXCLUDE;
2056 continue;
2057 }
2058
2059 if ((s->flags & SEC_HAS_CONTENTS) == 0)
2060 continue;
2061
2062 /* Allocate memory for the section contents. We use bfd_zalloc
2063 here in case unused entries are not reclaimed before the
2064 section's contents are written out. This should not happen,
2065 but this way if it does, we get a R_386_NONE reloc instead
2066 of garbage. */
2067 s->contents = bfd_zalloc (dynobj, s->size);
2068 if (s->contents == NULL)
2069 return FALSE;
2070 }
2071
2072 if (htab->elf.dynamic_sections_created)
2073 {
2074 /* Add some entries to the .dynamic section. We fill in the
2075 values later, in elf_i386_finish_dynamic_sections, but we
2076 must add the entries now so that we get the correct size for
2077 the .dynamic section. The DT_DEBUG entry is filled in by the
2078 dynamic linker and used by the debugger. */
2079 #define add_dynamic_entry(TAG, VAL) \
2080 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
2081
2082 if (info->executable)
2083 {
2084 if (!add_dynamic_entry (DT_DEBUG, 0))
2085 return FALSE;
2086 }
2087
2088 if (htab->splt->size != 0)
2089 {
2090 if (!add_dynamic_entry (DT_PLTGOT, 0)
2091 || !add_dynamic_entry (DT_PLTRELSZ, 0)
2092 || !add_dynamic_entry (DT_PLTREL, DT_REL)
2093 || !add_dynamic_entry (DT_JMPREL, 0))
2094 return FALSE;
2095 }
2096
2097 if (relocs)
2098 {
2099 if (!add_dynamic_entry (DT_REL, 0)
2100 || !add_dynamic_entry (DT_RELSZ, 0)
2101 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
2102 return FALSE;
2103
2104 /* If any dynamic relocs apply to a read-only section,
2105 then we need a DT_TEXTREL entry. */
2106 if ((info->flags & DF_TEXTREL) == 0)
2107 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
2108 (PTR) info);
2109
2110 if ((info->flags & DF_TEXTREL) != 0)
2111 {
2112 if (!add_dynamic_entry (DT_TEXTREL, 0))
2113 return FALSE;
2114 }
2115 }
2116 }
2117 #undef add_dynamic_entry
2118
2119 return TRUE;
2120 }
2121
2122 static bfd_boolean
2123 elf_i386_always_size_sections (bfd *output_bfd,
2124 struct bfd_link_info *info)
2125 {
2126 asection *tls_sec = elf_hash_table (info)->tls_sec;
2127
2128 if (tls_sec)
2129 {
2130 struct elf_link_hash_entry *tlsbase;
2131
2132 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
2133 "_TLS_MODULE_BASE_",
2134 FALSE, FALSE, FALSE);
2135
2136 if (tlsbase && tlsbase->type == STT_TLS)
2137 {
2138 struct bfd_link_hash_entry *bh = NULL;
2139 const struct elf_backend_data *bed
2140 = get_elf_backend_data (output_bfd);
2141
2142 if (!(_bfd_generic_link_add_one_symbol
2143 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
2144 tls_sec, 0, NULL, FALSE,
2145 bed->collect, &bh)))
2146 return FALSE;
2147 tlsbase = (struct elf_link_hash_entry *)bh;
2148 tlsbase->def_regular = 1;
2149 tlsbase->other = STV_HIDDEN;
2150 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
2151 }
2152 }
2153
2154 return TRUE;
2155 }
2156
2157 /* Set the correct type for an x86 ELF section. We do this by the
2158 section name, which is a hack, but ought to work. */
2159
2160 static bfd_boolean
2161 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
2162 Elf_Internal_Shdr *hdr,
2163 asection *sec)
2164 {
2165 register const char *name;
2166
2167 name = bfd_get_section_name (abfd, sec);
2168
2169 /* This is an ugly, but unfortunately necessary hack that is
2170 needed when producing EFI binaries on x86. It tells
2171 elf.c:elf_fake_sections() not to consider ".reloc" as a section
2172 containing ELF relocation info. We need this hack in order to
2173 be able to generate ELF binaries that can be translated into
2174 EFI applications (which are essentially COFF objects). Those
2175 files contain a COFF ".reloc" section inside an ELFNN object,
2176 which would normally cause BFD to segfault because it would
2177 attempt to interpret this section as containing relocation
2178 entries for section "oc". With this hack enabled, ".reloc"
2179 will be treated as a normal data section, which will avoid the
2180 segfault. However, you won't be able to create an ELFNN binary
2181 with a section named "oc" that needs relocations, but that's
2182 the kind of ugly side-effects you get when detecting section
2183 types based on their names... In practice, this limitation is
2184 unlikely to bite. */
2185 if (strcmp (name, ".reloc") == 0)
2186 hdr->sh_type = SHT_PROGBITS;
2187
2188 return TRUE;
2189 }
2190
2191 /* Return the base VMA address which should be subtracted from real addresses
2192 when resolving @dtpoff relocation.
2193 This is PT_TLS segment p_vaddr. */
2194
2195 static bfd_vma
2196 dtpoff_base (struct bfd_link_info *info)
2197 {
2198 /* If tls_sec is NULL, we should have signalled an error already. */
2199 if (elf_hash_table (info)->tls_sec == NULL)
2200 return 0;
2201 return elf_hash_table (info)->tls_sec->vma;
2202 }
2203
2204 /* Return the relocation value for @tpoff relocation
2205 if STT_TLS virtual address is ADDRESS. */
2206
2207 static bfd_vma
2208 tpoff (struct bfd_link_info *info, bfd_vma address)
2209 {
2210 struct elf_link_hash_table *htab = elf_hash_table (info);
2211
2212 /* If tls_sec is NULL, we should have signalled an error already. */
2213 if (htab->tls_sec == NULL)
2214 return 0;
2215 return htab->tls_size + htab->tls_sec->vma - address;
2216 }
2217
2218 /* Relocate an i386 ELF section. */
2219
2220 static bfd_boolean
2221 elf_i386_relocate_section (bfd *output_bfd,
2222 struct bfd_link_info *info,
2223 bfd *input_bfd,
2224 asection *input_section,
2225 bfd_byte *contents,
2226 Elf_Internal_Rela *relocs,
2227 Elf_Internal_Sym *local_syms,
2228 asection **local_sections)
2229 {
2230 struct elf_i386_link_hash_table *htab;
2231 Elf_Internal_Shdr *symtab_hdr;
2232 struct elf_link_hash_entry **sym_hashes;
2233 bfd_vma *local_got_offsets;
2234 bfd_vma *local_tlsdesc_gotents;
2235 Elf_Internal_Rela *rel;
2236 Elf_Internal_Rela *relend;
2237
2238 htab = elf_i386_hash_table (info);
2239 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2240 sym_hashes = elf_sym_hashes (input_bfd);
2241 local_got_offsets = elf_local_got_offsets (input_bfd);
2242 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
2243
2244 rel = relocs;
2245 relend = relocs + input_section->reloc_count;
2246 for (; rel < relend; rel++)
2247 {
2248 unsigned int r_type;
2249 reloc_howto_type *howto;
2250 unsigned long r_symndx;
2251 struct elf_link_hash_entry *h;
2252 Elf_Internal_Sym *sym;
2253 asection *sec;
2254 bfd_vma off, offplt;
2255 bfd_vma relocation;
2256 bfd_boolean unresolved_reloc;
2257 bfd_reloc_status_type r;
2258 unsigned int indx;
2259 int tls_type;
2260
2261 r_type = ELF32_R_TYPE (rel->r_info);
2262 if (r_type == R_386_GNU_VTINHERIT
2263 || r_type == R_386_GNU_VTENTRY)
2264 continue;
2265
2266 if ((indx = r_type) >= R_386_standard
2267 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2268 >= R_386_ext - R_386_standard)
2269 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2270 >= R_386_tls - R_386_ext))
2271 {
2272 (*_bfd_error_handler)
2273 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2274 input_bfd, input_section, r_type);
2275 bfd_set_error (bfd_error_bad_value);
2276 return FALSE;
2277 }
2278 howto = elf_howto_table + indx;
2279
2280 r_symndx = ELF32_R_SYM (rel->r_info);
2281 h = NULL;
2282 sym = NULL;
2283 sec = NULL;
2284 unresolved_reloc = FALSE;
2285 if (r_symndx < symtab_hdr->sh_info)
2286 {
2287 sym = local_syms + r_symndx;
2288 sec = local_sections[r_symndx];
2289 relocation = (sec->output_section->vma
2290 + sec->output_offset
2291 + sym->st_value);
2292
2293 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2294 && ((sec->flags & SEC_MERGE) != 0
2295 || (info->relocatable
2296 && sec->output_offset != 0)))
2297 {
2298 bfd_vma addend;
2299 bfd_byte *where = contents + rel->r_offset;
2300
2301 switch (howto->size)
2302 {
2303 case 0:
2304 addend = bfd_get_8 (input_bfd, where);
2305 if (howto->pc_relative)
2306 {
2307 addend = (addend ^ 0x80) - 0x80;
2308 addend += 1;
2309 }
2310 break;
2311 case 1:
2312 addend = bfd_get_16 (input_bfd, where);
2313 if (howto->pc_relative)
2314 {
2315 addend = (addend ^ 0x8000) - 0x8000;
2316 addend += 2;
2317 }
2318 break;
2319 case 2:
2320 addend = bfd_get_32 (input_bfd, where);
2321 if (howto->pc_relative)
2322 {
2323 addend = (addend ^ 0x80000000) - 0x80000000;
2324 addend += 4;
2325 }
2326 break;
2327 default:
2328 abort ();
2329 }
2330
2331 if (info->relocatable)
2332 addend += sec->output_offset;
2333 else
2334 {
2335 asection *msec = sec;
2336 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2337 addend);
2338 addend -= relocation;
2339 addend += msec->output_section->vma + msec->output_offset;
2340 }
2341
2342 switch (howto->size)
2343 {
2344 case 0:
2345 /* FIXME: overflow checks. */
2346 if (howto->pc_relative)
2347 addend -= 1;
2348 bfd_put_8 (input_bfd, addend, where);
2349 break;
2350 case 1:
2351 if (howto->pc_relative)
2352 addend -= 2;
2353 bfd_put_16 (input_bfd, addend, where);
2354 break;
2355 case 2:
2356 if (howto->pc_relative)
2357 addend -= 4;
2358 bfd_put_32 (input_bfd, addend, where);
2359 break;
2360 }
2361 }
2362 }
2363 else
2364 {
2365 bfd_boolean warned;
2366
2367 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2368 r_symndx, symtab_hdr, sym_hashes,
2369 h, sec, relocation,
2370 unresolved_reloc, warned);
2371 }
2372
2373 if (sec != NULL && elf_discarded_section (sec))
2374 {
2375 /* For relocs against symbols from removed linkonce sections,
2376 or sections discarded by a linker script, we just want the
2377 section contents zeroed. Avoid any special processing. */
2378 _bfd_clear_contents (howto, input_bfd, contents + rel->r_offset);
2379 rel->r_info = 0;
2380 rel->r_addend = 0;
2381 continue;
2382 }
2383
2384 if (info->relocatable)
2385 continue;
2386
2387 switch (r_type)
2388 {
2389 case R_386_GOT32:
2390 /* Relocation is to the entry for this symbol in the global
2391 offset table. */
2392 if (htab->sgot == NULL)
2393 abort ();
2394
2395 if (h != NULL)
2396 {
2397 bfd_boolean dyn;
2398
2399 off = h->got.offset;
2400 dyn = htab->elf.dynamic_sections_created;
2401 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2402 || (info->shared
2403 && SYMBOL_REFERENCES_LOCAL (info, h))
2404 || (ELF_ST_VISIBILITY (h->other)
2405 && h->root.type == bfd_link_hash_undefweak))
2406 {
2407 /* This is actually a static link, or it is a
2408 -Bsymbolic link and the symbol is defined
2409 locally, or the symbol was forced to be local
2410 because of a version file. We must initialize
2411 this entry in the global offset table. Since the
2412 offset must always be a multiple of 4, we use the
2413 least significant bit to record whether we have
2414 initialized it already.
2415
2416 When doing a dynamic link, we create a .rel.got
2417 relocation entry to initialize the value. This
2418 is done in the finish_dynamic_symbol routine. */
2419 if ((off & 1) != 0)
2420 off &= ~1;
2421 else
2422 {
2423 bfd_put_32 (output_bfd, relocation,
2424 htab->sgot->contents + off);
2425 h->got.offset |= 1;
2426 }
2427 }
2428 else
2429 unresolved_reloc = FALSE;
2430 }
2431 else
2432 {
2433 if (local_got_offsets == NULL)
2434 abort ();
2435
2436 off = local_got_offsets[r_symndx];
2437
2438 /* The offset must always be a multiple of 4. We use
2439 the least significant bit to record whether we have
2440 already generated the necessary reloc. */
2441 if ((off & 1) != 0)
2442 off &= ~1;
2443 else
2444 {
2445 bfd_put_32 (output_bfd, relocation,
2446 htab->sgot->contents + off);
2447
2448 if (info->shared)
2449 {
2450 asection *s;
2451 Elf_Internal_Rela outrel;
2452 bfd_byte *loc;
2453
2454 s = htab->srelgot;
2455 if (s == NULL)
2456 abort ();
2457
2458 outrel.r_offset = (htab->sgot->output_section->vma
2459 + htab->sgot->output_offset
2460 + off);
2461 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2462 loc = s->contents;
2463 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2464 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2465 }
2466
2467 local_got_offsets[r_symndx] |= 1;
2468 }
2469 }
2470
2471 if (off >= (bfd_vma) -2)
2472 abort ();
2473
2474 relocation = htab->sgot->output_section->vma
2475 + htab->sgot->output_offset + off
2476 - htab->sgotplt->output_section->vma
2477 - htab->sgotplt->output_offset;
2478 break;
2479
2480 case R_386_GOTOFF:
2481 /* Relocation is relative to the start of the global offset
2482 table. */
2483
2484 /* Check to make sure it isn't a protected function symbol
2485 for shared library since it may not be local when used
2486 as function address. */
2487 if (info->shared
2488 && !info->executable
2489 && h
2490 && h->def_regular
2491 && h->type == STT_FUNC
2492 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2493 {
2494 (*_bfd_error_handler)
2495 (_("%B: relocation R_386_GOTOFF against protected function `%s' can not be used when making a shared object"),
2496 input_bfd, h->root.root.string);
2497 bfd_set_error (bfd_error_bad_value);
2498 return FALSE;
2499 }
2500
2501 /* Note that sgot is not involved in this
2502 calculation. We always want the start of .got.plt. If we
2503 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2504 permitted by the ABI, we might have to change this
2505 calculation. */
2506 relocation -= htab->sgotplt->output_section->vma
2507 + htab->sgotplt->output_offset;
2508 break;
2509
2510 case R_386_GOTPC:
2511 /* Use global offset table as symbol value. */
2512 relocation = htab->sgotplt->output_section->vma
2513 + htab->sgotplt->output_offset;
2514 unresolved_reloc = FALSE;
2515 break;
2516
2517 case R_386_PLT32:
2518 /* Relocation is to the entry for this symbol in the
2519 procedure linkage table. */
2520
2521 /* Resolve a PLT32 reloc against a local symbol directly,
2522 without using the procedure linkage table. */
2523 if (h == NULL)
2524 break;
2525
2526 if (h->plt.offset == (bfd_vma) -1
2527 || htab->splt == NULL)
2528 {
2529 /* We didn't make a PLT entry for this symbol. This
2530 happens when statically linking PIC code, or when
2531 using -Bsymbolic. */
2532 break;
2533 }
2534
2535 relocation = (htab->splt->output_section->vma
2536 + htab->splt->output_offset
2537 + h->plt.offset);
2538 unresolved_reloc = FALSE;
2539 break;
2540
2541 case R_386_32:
2542 case R_386_PC32:
2543 if ((input_section->flags & SEC_ALLOC) == 0)
2544 break;
2545
2546 if ((info->shared
2547 && (h == NULL
2548 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2549 || h->root.type != bfd_link_hash_undefweak)
2550 && (r_type != R_386_PC32
2551 || !SYMBOL_CALLS_LOCAL (info, h)))
2552 || (ELIMINATE_COPY_RELOCS
2553 && !info->shared
2554 && h != NULL
2555 && h->dynindx != -1
2556 && !h->non_got_ref
2557 && ((h->def_dynamic
2558 && !h->def_regular)
2559 || h->root.type == bfd_link_hash_undefweak
2560 || h->root.type == bfd_link_hash_undefined)))
2561 {
2562 Elf_Internal_Rela outrel;
2563 bfd_byte *loc;
2564 bfd_boolean skip, relocate;
2565 asection *sreloc;
2566
2567 /* When generating a shared object, these relocations
2568 are copied into the output file to be resolved at run
2569 time. */
2570
2571 skip = FALSE;
2572 relocate = FALSE;
2573
2574 outrel.r_offset =
2575 _bfd_elf_section_offset (output_bfd, info, input_section,
2576 rel->r_offset);
2577 if (outrel.r_offset == (bfd_vma) -1)
2578 skip = TRUE;
2579 else if (outrel.r_offset == (bfd_vma) -2)
2580 skip = TRUE, relocate = TRUE;
2581 outrel.r_offset += (input_section->output_section->vma
2582 + input_section->output_offset);
2583
2584 if (skip)
2585 memset (&outrel, 0, sizeof outrel);
2586 else if (h != NULL
2587 && h->dynindx != -1
2588 && (r_type == R_386_PC32
2589 || !info->shared
2590 || !SYMBOLIC_BIND (info, h)
2591 || !h->def_regular))
2592 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2593 else
2594 {
2595 /* This symbol is local, or marked to become local. */
2596 relocate = TRUE;
2597 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2598 }
2599
2600 sreloc = elf_section_data (input_section)->sreloc;
2601 if (sreloc == NULL)
2602 abort ();
2603
2604 loc = sreloc->contents;
2605 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2606 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2607
2608 /* If this reloc is against an external symbol, we do
2609 not want to fiddle with the addend. Otherwise, we
2610 need to include the symbol value so that it becomes
2611 an addend for the dynamic reloc. */
2612 if (! relocate)
2613 continue;
2614 }
2615 break;
2616
2617 case R_386_TLS_IE:
2618 if (info->shared)
2619 {
2620 Elf_Internal_Rela outrel;
2621 bfd_byte *loc;
2622 asection *sreloc;
2623
2624 outrel.r_offset = rel->r_offset
2625 + input_section->output_section->vma
2626 + input_section->output_offset;
2627 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2628 sreloc = elf_section_data (input_section)->sreloc;
2629 if (sreloc == NULL)
2630 abort ();
2631 loc = sreloc->contents;
2632 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2633 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2634 }
2635 /* Fall through */
2636
2637 case R_386_TLS_GD:
2638 case R_386_TLS_GOTDESC:
2639 case R_386_TLS_DESC_CALL:
2640 case R_386_TLS_IE_32:
2641 case R_386_TLS_GOTIE:
2642 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2643 tls_type = GOT_UNKNOWN;
2644 if (h == NULL && local_got_offsets)
2645 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2646 else if (h != NULL)
2647 {
2648 tls_type = elf_i386_hash_entry(h)->tls_type;
2649 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2650 r_type = R_386_TLS_LE_32;
2651 }
2652 if (tls_type == GOT_TLS_IE)
2653 tls_type = GOT_TLS_IE_NEG;
2654 if (r_type == R_386_TLS_GD
2655 || r_type == R_386_TLS_GOTDESC
2656 || r_type == R_386_TLS_DESC_CALL)
2657 {
2658 if (tls_type == GOT_TLS_IE_POS)
2659 r_type = R_386_TLS_GOTIE;
2660 else if (tls_type & GOT_TLS_IE)
2661 r_type = R_386_TLS_IE_32;
2662 }
2663
2664 if (r_type == R_386_TLS_LE_32)
2665 {
2666 BFD_ASSERT (! unresolved_reloc);
2667 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2668 {
2669 unsigned int val, type;
2670 bfd_vma roff;
2671
2672 /* GD->LE transition. */
2673 BFD_ASSERT (rel->r_offset >= 2);
2674 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2675 BFD_ASSERT (type == 0x8d || type == 0x04);
2676 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2677 BFD_ASSERT (bfd_get_8 (input_bfd,
2678 contents + rel->r_offset + 4)
2679 == 0xe8);
2680 BFD_ASSERT (rel + 1 < relend);
2681 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2682 roff = rel->r_offset + 5;
2683 val = bfd_get_8 (input_bfd,
2684 contents + rel->r_offset - 1);
2685 if (type == 0x04)
2686 {
2687 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2688 Change it into:
2689 movl %gs:0, %eax; subl $foo@tpoff, %eax
2690 (6 byte form of subl). */
2691 BFD_ASSERT (rel->r_offset >= 3);
2692 BFD_ASSERT (bfd_get_8 (input_bfd,
2693 contents + rel->r_offset - 3)
2694 == 0x8d);
2695 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2696 memcpy (contents + rel->r_offset - 3,
2697 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2698 }
2699 else
2700 {
2701 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2702 if (rel->r_offset + 10 <= input_section->size
2703 && bfd_get_8 (input_bfd,
2704 contents + rel->r_offset + 9) == 0x90)
2705 {
2706 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2707 Change it into:
2708 movl %gs:0, %eax; subl $foo@tpoff, %eax
2709 (6 byte form of subl). */
2710 memcpy (contents + rel->r_offset - 2,
2711 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2712 roff = rel->r_offset + 6;
2713 }
2714 else
2715 {
2716 /* leal foo(%reg), %eax; call ___tls_get_addr
2717 Change it into:
2718 movl %gs:0, %eax; subl $foo@tpoff, %eax
2719 (5 byte form of subl). */
2720 memcpy (contents + rel->r_offset - 2,
2721 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2722 }
2723 }
2724 bfd_put_32 (output_bfd, tpoff (info, relocation),
2725 contents + roff);
2726 /* Skip R_386_PLT32. */
2727 rel++;
2728 continue;
2729 }
2730 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
2731 {
2732 /* GDesc -> LE transition.
2733 It's originally something like:
2734 leal x@tlsdesc(%ebx), %eax
2735
2736 leal x@ntpoff, %eax
2737
2738 Registers other than %eax may be set up here. */
2739
2740 unsigned int val, type;
2741 bfd_vma roff;
2742
2743 /* First, make sure it's a leal adding ebx to a
2744 32-bit offset into any register, although it's
2745 probably almost always going to be eax. */
2746 roff = rel->r_offset;
2747 BFD_ASSERT (roff >= 2);
2748 type = bfd_get_8 (input_bfd, contents + roff - 2);
2749 BFD_ASSERT (type == 0x8d);
2750 val = bfd_get_8 (input_bfd, contents + roff - 1);
2751 BFD_ASSERT ((val & 0xc7) == 0x83);
2752 BFD_ASSERT (roff + 4 <= input_section->size);
2753
2754 /* Now modify the instruction as appropriate. */
2755 /* aoliva FIXME: remove the above and xor the byte
2756 below with 0x86. */
2757 bfd_put_8 (output_bfd, val ^ 0x86,
2758 contents + roff - 1);
2759 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2760 contents + roff);
2761 continue;
2762 }
2763 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
2764 {
2765 /* GDesc -> LE transition.
2766 It's originally:
2767 call *(%eax)
2768 Turn it into:
2769 nop; nop */
2770
2771 unsigned int val, type;
2772 bfd_vma roff;
2773
2774 /* First, make sure it's a call *(%eax). */
2775 roff = rel->r_offset;
2776 BFD_ASSERT (roff + 2 <= input_section->size);
2777 type = bfd_get_8 (input_bfd, contents + roff);
2778 BFD_ASSERT (type == 0xff);
2779 val = bfd_get_8 (input_bfd, contents + roff + 1);
2780 BFD_ASSERT (val == 0x10);
2781
2782 /* Now modify the instruction as appropriate. Use
2783 xchg %ax,%ax instead of 2 nops. */
2784 bfd_put_8 (output_bfd, 0x66, contents + roff);
2785 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2786 continue;
2787 }
2788 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2789 {
2790 unsigned int val, type;
2791
2792 /* IE->LE transition:
2793 Originally it can be one of:
2794 movl foo, %eax
2795 movl foo, %reg
2796 addl foo, %reg
2797 We change it into:
2798 movl $foo, %eax
2799 movl $foo, %reg
2800 addl $foo, %reg. */
2801 BFD_ASSERT (rel->r_offset >= 1);
2802 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2803 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2804 if (val == 0xa1)
2805 {
2806 /* movl foo, %eax. */
2807 bfd_put_8 (output_bfd, 0xb8,
2808 contents + rel->r_offset - 1);
2809 }
2810 else
2811 {
2812 BFD_ASSERT (rel->r_offset >= 2);
2813 type = bfd_get_8 (input_bfd,
2814 contents + rel->r_offset - 2);
2815 switch (type)
2816 {
2817 case 0x8b:
2818 /* movl */
2819 BFD_ASSERT ((val & 0xc7) == 0x05);
2820 bfd_put_8 (output_bfd, 0xc7,
2821 contents + rel->r_offset - 2);
2822 bfd_put_8 (output_bfd,
2823 0xc0 | ((val >> 3) & 7),
2824 contents + rel->r_offset - 1);
2825 break;
2826 case 0x03:
2827 /* addl */
2828 BFD_ASSERT ((val & 0xc7) == 0x05);
2829 bfd_put_8 (output_bfd, 0x81,
2830 contents + rel->r_offset - 2);
2831 bfd_put_8 (output_bfd,
2832 0xc0 | ((val >> 3) & 7),
2833 contents + rel->r_offset - 1);
2834 break;
2835 default:
2836 BFD_FAIL ();
2837 break;
2838 }
2839 }
2840 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2841 contents + rel->r_offset);
2842 continue;
2843 }
2844 else
2845 {
2846 unsigned int val, type;
2847
2848 /* {IE_32,GOTIE}->LE transition:
2849 Originally it can be one of:
2850 subl foo(%reg1), %reg2
2851 movl foo(%reg1), %reg2
2852 addl foo(%reg1), %reg2
2853 We change it into:
2854 subl $foo, %reg2
2855 movl $foo, %reg2 (6 byte form)
2856 addl $foo, %reg2. */
2857 BFD_ASSERT (rel->r_offset >= 2);
2858 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2859 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2860 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2861 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2862 if (type == 0x8b)
2863 {
2864 /* movl */
2865 bfd_put_8 (output_bfd, 0xc7,
2866 contents + rel->r_offset - 2);
2867 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2868 contents + rel->r_offset - 1);
2869 }
2870 else if (type == 0x2b)
2871 {
2872 /* subl */
2873 bfd_put_8 (output_bfd, 0x81,
2874 contents + rel->r_offset - 2);
2875 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2876 contents + rel->r_offset - 1);
2877 }
2878 else if (type == 0x03)
2879 {
2880 /* addl */
2881 bfd_put_8 (output_bfd, 0x81,
2882 contents + rel->r_offset - 2);
2883 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2884 contents + rel->r_offset - 1);
2885 }
2886 else
2887 BFD_FAIL ();
2888 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2889 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2890 contents + rel->r_offset);
2891 else
2892 bfd_put_32 (output_bfd, tpoff (info, relocation),
2893 contents + rel->r_offset);
2894 continue;
2895 }
2896 }
2897
2898 if (htab->sgot == NULL)
2899 abort ();
2900
2901 if (h != NULL)
2902 {
2903 off = h->got.offset;
2904 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
2905 }
2906 else
2907 {
2908 if (local_got_offsets == NULL)
2909 abort ();
2910
2911 off = local_got_offsets[r_symndx];
2912 offplt = local_tlsdesc_gotents[r_symndx];
2913 }
2914
2915 if ((off & 1) != 0)
2916 off &= ~1;
2917 else
2918 {
2919 Elf_Internal_Rela outrel;
2920 bfd_byte *loc;
2921 int dr_type, indx;
2922 asection *sreloc;
2923
2924 if (htab->srelgot == NULL)
2925 abort ();
2926
2927 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2928
2929 if (GOT_TLS_GDESC_P (tls_type))
2930 {
2931 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
2932 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
2933 <= htab->sgotplt->size);
2934 outrel.r_offset = (htab->sgotplt->output_section->vma
2935 + htab->sgotplt->output_offset
2936 + offplt
2937 + htab->sgotplt_jump_table_size);
2938 sreloc = htab->srelplt;
2939 loc = sreloc->contents;
2940 loc += (htab->next_tls_desc_index++
2941 * sizeof (Elf32_External_Rel));
2942 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
2943 <= sreloc->contents + sreloc->size);
2944 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2945 if (indx == 0)
2946 {
2947 BFD_ASSERT (! unresolved_reloc);
2948 bfd_put_32 (output_bfd,
2949 relocation - dtpoff_base (info),
2950 htab->sgotplt->contents + offplt
2951 + htab->sgotplt_jump_table_size + 4);
2952 }
2953 else
2954 {
2955 bfd_put_32 (output_bfd, 0,
2956 htab->sgotplt->contents + offplt
2957 + htab->sgotplt_jump_table_size + 4);
2958 }
2959 }
2960
2961 sreloc = htab->srelgot;
2962
2963 outrel.r_offset = (htab->sgot->output_section->vma
2964 + htab->sgot->output_offset + off);
2965
2966 if (GOT_TLS_GD_P (tls_type))
2967 dr_type = R_386_TLS_DTPMOD32;
2968 else if (GOT_TLS_GDESC_P (tls_type))
2969 goto dr_done;
2970 else if (tls_type == GOT_TLS_IE_POS)
2971 dr_type = R_386_TLS_TPOFF;
2972 else
2973 dr_type = R_386_TLS_TPOFF32;
2974
2975 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2976 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2977 htab->sgot->contents + off);
2978 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2979 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2980 htab->sgot->contents + off);
2981 else if (dr_type != R_386_TLS_DESC)
2982 bfd_put_32 (output_bfd, 0,
2983 htab->sgot->contents + off);
2984 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2985
2986 loc = sreloc->contents;
2987 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2988 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
2989 <= sreloc->contents + sreloc->size);
2990 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2991
2992 if (GOT_TLS_GD_P (tls_type))
2993 {
2994 if (indx == 0)
2995 {
2996 BFD_ASSERT (! unresolved_reloc);
2997 bfd_put_32 (output_bfd,
2998 relocation - dtpoff_base (info),
2999 htab->sgot->contents + off + 4);
3000 }
3001 else
3002 {
3003 bfd_put_32 (output_bfd, 0,
3004 htab->sgot->contents + off + 4);
3005 outrel.r_info = ELF32_R_INFO (indx,
3006 R_386_TLS_DTPOFF32);
3007 outrel.r_offset += 4;
3008 sreloc->reloc_count++;
3009 loc += sizeof (Elf32_External_Rel);
3010 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3011 <= sreloc->contents + sreloc->size);
3012 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3013 }
3014 }
3015 else if (tls_type == GOT_TLS_IE_BOTH)
3016 {
3017 bfd_put_32 (output_bfd,
3018 indx == 0 ? relocation - dtpoff_base (info) : 0,
3019 htab->sgot->contents + off + 4);
3020 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3021 outrel.r_offset += 4;
3022 sreloc->reloc_count++;
3023 loc += sizeof (Elf32_External_Rel);
3024 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3025 }
3026
3027 dr_done:
3028 if (h != NULL)
3029 h->got.offset |= 1;
3030 else
3031 local_got_offsets[r_symndx] |= 1;
3032 }
3033
3034 if (off >= (bfd_vma) -2
3035 && ! GOT_TLS_GDESC_P (tls_type))
3036 abort ();
3037 if (r_type == R_386_TLS_GOTDESC
3038 || r_type == R_386_TLS_DESC_CALL)
3039 {
3040 relocation = htab->sgotplt_jump_table_size + offplt;
3041 unresolved_reloc = FALSE;
3042 }
3043 else if (r_type == ELF32_R_TYPE (rel->r_info))
3044 {
3045 bfd_vma g_o_t = htab->sgotplt->output_section->vma
3046 + htab->sgotplt->output_offset;
3047 relocation = htab->sgot->output_section->vma
3048 + htab->sgot->output_offset + off - g_o_t;
3049 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3050 && tls_type == GOT_TLS_IE_BOTH)
3051 relocation += 4;
3052 if (r_type == R_386_TLS_IE)
3053 relocation += g_o_t;
3054 unresolved_reloc = FALSE;
3055 }
3056 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
3057 {
3058 unsigned int val, type;
3059 bfd_vma roff;
3060
3061 /* GD->IE transition. */
3062 BFD_ASSERT (rel->r_offset >= 2);
3063 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3064 BFD_ASSERT (type == 0x8d || type == 0x04);
3065 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
3066 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
3067 == 0xe8);
3068 BFD_ASSERT (rel + 1 < relend);
3069 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
3070 roff = rel->r_offset - 3;
3071 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3072 if (type == 0x04)
3073 {
3074 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
3075 Change it into:
3076 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3077 BFD_ASSERT (rel->r_offset >= 3);
3078 BFD_ASSERT (bfd_get_8 (input_bfd,
3079 contents + rel->r_offset - 3)
3080 == 0x8d);
3081 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
3082 val >>= 3;
3083 }
3084 else
3085 {
3086 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
3087 Change it into:
3088 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
3089 BFD_ASSERT (rel->r_offset + 10 <= input_section->size);
3090 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
3091 BFD_ASSERT (bfd_get_8 (input_bfd,
3092 contents + rel->r_offset + 9)
3093 == 0x90);
3094 roff = rel->r_offset - 2;
3095 }
3096 memcpy (contents + roff,
3097 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3098 contents[roff + 7] = 0x80 | (val & 7);
3099 /* If foo is used only with foo@gotntpoff(%reg) and
3100 foo@indntpoff, but not with foo@gottpoff(%reg), change
3101 subl $foo@gottpoff(%reg), %eax
3102 into:
3103 addl $foo@gotntpoff(%reg), %eax. */
3104 if (tls_type == GOT_TLS_IE_POS)
3105 contents[roff + 6] = 0x03;
3106 bfd_put_32 (output_bfd,
3107 htab->sgot->output_section->vma
3108 + htab->sgot->output_offset + off
3109 - htab->sgotplt->output_section->vma
3110 - htab->sgotplt->output_offset,
3111 contents + roff + 8);
3112 /* Skip R_386_PLT32. */
3113 rel++;
3114 continue;
3115 }
3116 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
3117 {
3118 /* GDesc -> IE transition.
3119 It's originally something like:
3120 leal x@tlsdesc(%ebx), %eax
3121
3122 Change it to:
3123 movl x@gotntpoff(%ebx), %eax # before nop; nop
3124 or:
3125 movl x@gottpoff(%ebx), %eax # before negl %eax
3126
3127 Registers other than %eax may be set up here. */
3128
3129 unsigned int val, type;
3130 bfd_vma roff;
3131
3132 /* First, make sure it's a leal adding ebx to a 32-bit
3133 offset into any register, although it's probably
3134 almost always going to be eax. */
3135 roff = rel->r_offset;
3136 BFD_ASSERT (roff >= 2);
3137 type = bfd_get_8 (input_bfd, contents + roff - 2);
3138 BFD_ASSERT (type == 0x8d);
3139 val = bfd_get_8 (input_bfd, contents + roff - 1);
3140 BFD_ASSERT ((val & 0xc7) == 0x83);
3141 BFD_ASSERT (roff + 4 <= input_section->size);
3142
3143 /* Now modify the instruction as appropriate. */
3144 /* To turn a leal into a movl in the form we use it, it
3145 suffices to change the first byte from 0x8d to 0x8b.
3146 aoliva FIXME: should we decide to keep the leal, all
3147 we have to do is remove the statement below, and
3148 adjust the relaxation of R_386_TLS_DESC_CALL. */
3149 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3150
3151 if (tls_type == GOT_TLS_IE_BOTH)
3152 off += 4;
3153
3154 bfd_put_32 (output_bfd,
3155 htab->sgot->output_section->vma
3156 + htab->sgot->output_offset + off
3157 - htab->sgotplt->output_section->vma
3158 - htab->sgotplt->output_offset,
3159 contents + roff);
3160 continue;
3161 }
3162 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
3163 {
3164 /* GDesc -> IE transition.
3165 It's originally:
3166 call *(%eax)
3167
3168 Change it to:
3169 nop; nop
3170 or
3171 negl %eax
3172 depending on how we transformed the TLS_GOTDESC above.
3173 */
3174
3175 unsigned int val, type;
3176 bfd_vma roff;
3177
3178 /* First, make sure it's a call *(%eax). */
3179 roff = rel->r_offset;
3180 BFD_ASSERT (roff + 2 <= input_section->size);
3181 type = bfd_get_8 (input_bfd, contents + roff);
3182 BFD_ASSERT (type == 0xff);
3183 val = bfd_get_8 (input_bfd, contents + roff + 1);
3184 BFD_ASSERT (val == 0x10);
3185
3186 /* Now modify the instruction as appropriate. */
3187 if (tls_type != GOT_TLS_IE_NEG)
3188 {
3189 /* xchg %ax,%ax */
3190 bfd_put_8 (output_bfd, 0x66, contents + roff);
3191 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3192 }
3193 else
3194 {
3195 /* negl %eax */
3196 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3197 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3198 }
3199
3200 continue;
3201 }
3202 else
3203 BFD_ASSERT (FALSE);
3204 break;
3205
3206 case R_386_TLS_LDM:
3207 if (! info->shared)
3208 {
3209 unsigned int val;
3210
3211 /* LD->LE transition:
3212 Ensure it is:
3213 leal foo(%reg), %eax; call ___tls_get_addr.
3214 We change it into:
3215 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
3216 BFD_ASSERT (rel->r_offset >= 2);
3217 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
3218 == 0x8d);
3219 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3220 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
3221 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
3222 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
3223 == 0xe8);
3224 BFD_ASSERT (rel + 1 < relend);
3225 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
3226 memcpy (contents + rel->r_offset - 2,
3227 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3228 /* Skip R_386_PLT32. */
3229 rel++;
3230 continue;
3231 }
3232
3233 if (htab->sgot == NULL)
3234 abort ();
3235
3236 off = htab->tls_ldm_got.offset;
3237 if (off & 1)
3238 off &= ~1;
3239 else
3240 {
3241 Elf_Internal_Rela outrel;
3242 bfd_byte *loc;
3243
3244 if (htab->srelgot == NULL)
3245 abort ();
3246
3247 outrel.r_offset = (htab->sgot->output_section->vma
3248 + htab->sgot->output_offset + off);
3249
3250 bfd_put_32 (output_bfd, 0,
3251 htab->sgot->contents + off);
3252 bfd_put_32 (output_bfd, 0,
3253 htab->sgot->contents + off + 4);
3254 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3255 loc = htab->srelgot->contents;
3256 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3257 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3258 htab->tls_ldm_got.offset |= 1;
3259 }
3260 relocation = htab->sgot->output_section->vma
3261 + htab->sgot->output_offset + off
3262 - htab->sgotplt->output_section->vma
3263 - htab->sgotplt->output_offset;
3264 unresolved_reloc = FALSE;
3265 break;
3266
3267 case R_386_TLS_LDO_32:
3268 if (info->shared || (input_section->flags & SEC_CODE) == 0)
3269 relocation -= dtpoff_base (info);
3270 else
3271 /* When converting LDO to LE, we must negate. */
3272 relocation = -tpoff (info, relocation);
3273 break;
3274
3275 case R_386_TLS_LE_32:
3276 case R_386_TLS_LE:
3277 if (info->shared)
3278 {
3279 Elf_Internal_Rela outrel;
3280 asection *sreloc;
3281 bfd_byte *loc;
3282 int indx;
3283
3284 outrel.r_offset = rel->r_offset
3285 + input_section->output_section->vma
3286 + input_section->output_offset;
3287 if (h != NULL && h->dynindx != -1)
3288 indx = h->dynindx;
3289 else
3290 indx = 0;
3291 if (r_type == R_386_TLS_LE_32)
3292 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3293 else
3294 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3295 sreloc = elf_section_data (input_section)->sreloc;
3296 if (sreloc == NULL)
3297 abort ();
3298 loc = sreloc->contents;
3299 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
3300 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3301 if (indx)
3302 continue;
3303 else if (r_type == R_386_TLS_LE_32)
3304 relocation = dtpoff_base (info) - relocation;
3305 else
3306 relocation -= dtpoff_base (info);
3307 }
3308 else if (r_type == R_386_TLS_LE_32)
3309 relocation = tpoff (info, relocation);
3310 else
3311 relocation = -tpoff (info, relocation);
3312 break;
3313
3314 default:
3315 break;
3316 }
3317
3318 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3319 because such sections are not SEC_ALLOC and thus ld.so will
3320 not process them. */
3321 if (unresolved_reloc
3322 && !((input_section->flags & SEC_DEBUGGING) != 0
3323 && h->def_dynamic))
3324 {
3325 (*_bfd_error_handler)
3326 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
3327 input_bfd,
3328 input_section,
3329 (long) rel->r_offset,
3330 howto->name,
3331 h->root.root.string);
3332 return FALSE;
3333 }
3334
3335 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3336 contents, rel->r_offset,
3337 relocation, 0);
3338
3339 if (r != bfd_reloc_ok)
3340 {
3341 const char *name;
3342
3343 if (h != NULL)
3344 name = h->root.root.string;
3345 else
3346 {
3347 name = bfd_elf_string_from_elf_section (input_bfd,
3348 symtab_hdr->sh_link,
3349 sym->st_name);
3350 if (name == NULL)
3351 return FALSE;
3352 if (*name == '\0')
3353 name = bfd_section_name (input_bfd, sec);
3354 }
3355
3356 if (r == bfd_reloc_overflow)
3357 {
3358 if (! ((*info->callbacks->reloc_overflow)
3359 (info, (h ? &h->root : NULL), name, howto->name,
3360 (bfd_vma) 0, input_bfd, input_section,
3361 rel->r_offset)))
3362 return FALSE;
3363 }
3364 else
3365 {
3366 (*_bfd_error_handler)
3367 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
3368 input_bfd, input_section,
3369 (long) rel->r_offset, name, (int) r);
3370 return FALSE;
3371 }
3372 }
3373 }
3374
3375 return TRUE;
3376 }
3377
3378 /* Finish up dynamic symbol handling. We set the contents of various
3379 dynamic sections here. */
3380
3381 static bfd_boolean
3382 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3383 struct bfd_link_info *info,
3384 struct elf_link_hash_entry *h,
3385 Elf_Internal_Sym *sym)
3386 {
3387 struct elf_i386_link_hash_table *htab;
3388
3389 htab = elf_i386_hash_table (info);
3390
3391 if (h->plt.offset != (bfd_vma) -1)
3392 {
3393 bfd_vma plt_index;
3394 bfd_vma got_offset;
3395 Elf_Internal_Rela rel;
3396 bfd_byte *loc;
3397
3398 /* This symbol has an entry in the procedure linkage table. Set
3399 it up. */
3400
3401 if (h->dynindx == -1
3402 || htab->splt == NULL
3403 || htab->sgotplt == NULL
3404 || htab->srelplt == NULL)
3405 abort ();
3406
3407 /* Get the index in the procedure linkage table which
3408 corresponds to this symbol. This is the index of this symbol
3409 in all the symbols for which we are making plt entries. The
3410 first entry in the procedure linkage table is reserved. */
3411 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
3412
3413 /* Get the offset into the .got table of the entry that
3414 corresponds to this function. Each .got entry is 4 bytes.
3415 The first three are reserved. */
3416 got_offset = (plt_index + 3) * 4;
3417
3418 /* Fill in the entry in the procedure linkage table. */
3419 if (! info->shared)
3420 {
3421 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3422 PLT_ENTRY_SIZE);
3423 bfd_put_32 (output_bfd,
3424 (htab->sgotplt->output_section->vma
3425 + htab->sgotplt->output_offset
3426 + got_offset),
3427 htab->splt->contents + h->plt.offset + 2);
3428
3429 if (htab->is_vxworks)
3430 {
3431 int s, k, reloc_index;
3432
3433 /* Create the R_386_32 relocation referencing the GOT
3434 for this PLT entry. */
3435
3436 /* S: Current slot number (zero-based). */
3437 s = (h->plt.offset - PLT_ENTRY_SIZE) / PLT_ENTRY_SIZE;
3438 /* K: Number of relocations for PLTResolve. */
3439 if (info->shared)
3440 k = PLTRESOLVE_RELOCS_SHLIB;
3441 else
3442 k = PLTRESOLVE_RELOCS;
3443 /* Skip the PLTresolve relocations, and the relocations for
3444 the other PLT slots. */
3445 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3446 loc = (htab->srelplt2->contents + reloc_index
3447 * sizeof (Elf32_External_Rel));
3448
3449 rel.r_offset = (htab->splt->output_section->vma
3450 + htab->splt->output_offset
3451 + h->plt.offset + 2),
3452 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3453 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3454
3455 /* Create the R_386_32 relocation referencing the beginning of
3456 the PLT for this GOT entry. */
3457 rel.r_offset = (htab->sgotplt->output_section->vma
3458 + htab->sgotplt->output_offset
3459 + got_offset);
3460 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3461 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3462 loc + sizeof (Elf32_External_Rel));
3463 }
3464 }
3465 else
3466 {
3467 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3468 PLT_ENTRY_SIZE);
3469 bfd_put_32 (output_bfd, got_offset,
3470 htab->splt->contents + h->plt.offset + 2);
3471 }
3472
3473 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3474 htab->splt->contents + h->plt.offset + 7);
3475 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3476 htab->splt->contents + h->plt.offset + 12);
3477
3478 /* Fill in the entry in the global offset table. */
3479 bfd_put_32 (output_bfd,
3480 (htab->splt->output_section->vma
3481 + htab->splt->output_offset
3482 + h->plt.offset
3483 + 6),
3484 htab->sgotplt->contents + got_offset);
3485
3486 /* Fill in the entry in the .rel.plt section. */
3487 rel.r_offset = (htab->sgotplt->output_section->vma
3488 + htab->sgotplt->output_offset
3489 + got_offset);
3490 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3491 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3492 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3493
3494 if (!h->def_regular)
3495 {
3496 /* Mark the symbol as undefined, rather than as defined in
3497 the .plt section. Leave the value if there were any
3498 relocations where pointer equality matters (this is a clue
3499 for the dynamic linker, to make function pointer
3500 comparisons work between an application and shared
3501 library), otherwise set it to zero. If a function is only
3502 called from a binary, there is no need to slow down
3503 shared libraries because of that. */
3504 sym->st_shndx = SHN_UNDEF;
3505 if (!h->pointer_equality_needed)
3506 sym->st_value = 0;
3507 }
3508 }
3509
3510 if (h->got.offset != (bfd_vma) -1
3511 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
3512 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3513 {
3514 Elf_Internal_Rela rel;
3515 bfd_byte *loc;
3516
3517 /* This symbol has an entry in the global offset table. Set it
3518 up. */
3519
3520 if (htab->sgot == NULL || htab->srelgot == NULL)
3521 abort ();
3522
3523 rel.r_offset = (htab->sgot->output_section->vma
3524 + htab->sgot->output_offset
3525 + (h->got.offset & ~(bfd_vma) 1));
3526
3527 /* If this is a static link, or it is a -Bsymbolic link and the
3528 symbol is defined locally or was forced to be local because
3529 of a version file, we just want to emit a RELATIVE reloc.
3530 The entry in the global offset table will already have been
3531 initialized in the relocate_section function. */
3532 if (info->shared
3533 && SYMBOL_REFERENCES_LOCAL (info, h))
3534 {
3535 BFD_ASSERT((h->got.offset & 1) != 0);
3536 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3537 }
3538 else
3539 {
3540 BFD_ASSERT((h->got.offset & 1) == 0);
3541 bfd_put_32 (output_bfd, (bfd_vma) 0,
3542 htab->sgot->contents + h->got.offset);
3543 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3544 }
3545
3546 loc = htab->srelgot->contents;
3547 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3548 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3549 }
3550
3551 if (h->needs_copy)
3552 {
3553 Elf_Internal_Rela rel;
3554 bfd_byte *loc;
3555
3556 /* This symbol needs a copy reloc. Set it up. */
3557
3558 if (h->dynindx == -1
3559 || (h->root.type != bfd_link_hash_defined
3560 && h->root.type != bfd_link_hash_defweak)
3561 || htab->srelbss == NULL)
3562 abort ();
3563
3564 rel.r_offset = (h->root.u.def.value
3565 + h->root.u.def.section->output_section->vma
3566 + h->root.u.def.section->output_offset);
3567 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3568 loc = htab->srelbss->contents;
3569 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3570 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3571 }
3572
3573 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute.
3574 On VxWorks, the _GLOBAL_OFFSET_TABLE_ symbol is not absolute: it
3575 is relative to the ".got" section. */
3576 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3577 || (!htab->is_vxworks && h == htab->elf.hgot))
3578 sym->st_shndx = SHN_ABS;
3579
3580 return TRUE;
3581 }
3582
3583 /* Used to decide how to sort relocs in an optimal manner for the
3584 dynamic linker, before writing them out. */
3585
3586 static enum elf_reloc_type_class
3587 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3588 {
3589 switch (ELF32_R_TYPE (rela->r_info))
3590 {
3591 case R_386_RELATIVE:
3592 return reloc_class_relative;
3593 case R_386_JUMP_SLOT:
3594 return reloc_class_plt;
3595 case R_386_COPY:
3596 return reloc_class_copy;
3597 default:
3598 return reloc_class_normal;
3599 }
3600 }
3601
3602 /* Finish up the dynamic sections. */
3603
3604 static bfd_boolean
3605 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3606 struct bfd_link_info *info)
3607 {
3608 struct elf_i386_link_hash_table *htab;
3609 bfd *dynobj;
3610 asection *sdyn;
3611
3612 htab = elf_i386_hash_table (info);
3613 dynobj = htab->elf.dynobj;
3614 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3615
3616 if (htab->elf.dynamic_sections_created)
3617 {
3618 Elf32_External_Dyn *dyncon, *dynconend;
3619
3620 if (sdyn == NULL || htab->sgot == NULL)
3621 abort ();
3622
3623 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3624 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3625 for (; dyncon < dynconend; dyncon++)
3626 {
3627 Elf_Internal_Dyn dyn;
3628 asection *s;
3629
3630 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3631
3632 switch (dyn.d_tag)
3633 {
3634 default:
3635 continue;
3636
3637 case DT_PLTGOT:
3638 s = htab->sgotplt;
3639 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3640 break;
3641
3642 case DT_JMPREL:
3643 s = htab->srelplt;
3644 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3645 break;
3646
3647 case DT_PLTRELSZ:
3648 s = htab->srelplt;
3649 dyn.d_un.d_val = s->size;
3650 break;
3651
3652 case DT_RELSZ:
3653 /* My reading of the SVR4 ABI indicates that the
3654 procedure linkage table relocs (DT_JMPREL) should be
3655 included in the overall relocs (DT_REL). This is
3656 what Solaris does. However, UnixWare can not handle
3657 that case. Therefore, we override the DT_RELSZ entry
3658 here to make it not include the JMPREL relocs. */
3659 s = htab->srelplt;
3660 if (s == NULL)
3661 continue;
3662 dyn.d_un.d_val -= s->size;
3663 break;
3664
3665 case DT_REL:
3666 /* We may not be using the standard ELF linker script.
3667 If .rel.plt is the first .rel section, we adjust
3668 DT_REL to not include it. */
3669 s = htab->srelplt;
3670 if (s == NULL)
3671 continue;
3672 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3673 continue;
3674 dyn.d_un.d_ptr += s->size;
3675 break;
3676 }
3677
3678 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3679 }
3680
3681 /* Fill in the first entry in the procedure linkage table. */
3682 if (htab->splt && htab->splt->size > 0)
3683 {
3684 if (info->shared)
3685 {
3686 memcpy (htab->splt->contents, elf_i386_pic_plt0_entry,
3687 sizeof (elf_i386_pic_plt0_entry));
3688 memset (htab->splt->contents + sizeof (elf_i386_pic_plt0_entry),
3689 htab->plt0_pad_byte,
3690 PLT_ENTRY_SIZE - sizeof (elf_i386_pic_plt0_entry));
3691 }
3692 else
3693 {
3694 memcpy (htab->splt->contents, elf_i386_plt0_entry,
3695 sizeof(elf_i386_plt0_entry));
3696 memset (htab->splt->contents + sizeof (elf_i386_plt0_entry),
3697 htab->plt0_pad_byte,
3698 PLT_ENTRY_SIZE - sizeof (elf_i386_plt0_entry));
3699 bfd_put_32 (output_bfd,
3700 (htab->sgotplt->output_section->vma
3701 + htab->sgotplt->output_offset
3702 + 4),
3703 htab->splt->contents + 2);
3704 bfd_put_32 (output_bfd,
3705 (htab->sgotplt->output_section->vma
3706 + htab->sgotplt->output_offset
3707 + 8),
3708 htab->splt->contents + 8);
3709
3710 if (htab->is_vxworks)
3711 {
3712 Elf_Internal_Rela rel;
3713
3714 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
3715 On IA32 we use REL relocations so the addend goes in
3716 the PLT directly. */
3717 rel.r_offset = (htab->splt->output_section->vma
3718 + htab->splt->output_offset
3719 + 2);
3720 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3721 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3722 htab->srelplt2->contents);
3723 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
3724 rel.r_offset = (htab->splt->output_section->vma
3725 + htab->splt->output_offset
3726 + 8);
3727 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3728 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3729 htab->srelplt2->contents +
3730 sizeof (Elf32_External_Rel));
3731 }
3732 }
3733
3734 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3735 really seem like the right value. */
3736 elf_section_data (htab->splt->output_section)
3737 ->this_hdr.sh_entsize = 4;
3738
3739 /* Correct the .rel.plt.unloaded relocations. */
3740 if (htab->is_vxworks && !info->shared)
3741 {
3742 int num_plts = (htab->splt->size / PLT_ENTRY_SIZE) - 1;
3743 unsigned char *p;
3744
3745 p = htab->srelplt2->contents;
3746 if (info->shared)
3747 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
3748 else
3749 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
3750
3751 for (; num_plts; num_plts--)
3752 {
3753 Elf_Internal_Rela rel;
3754 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3755 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3756 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3757 p += sizeof (Elf32_External_Rel);
3758
3759 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
3760 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3761 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
3762 p += sizeof (Elf32_External_Rel);
3763 }
3764 }
3765 }
3766 }
3767
3768 if (htab->sgotplt)
3769 {
3770 /* Fill in the first three entries in the global offset table. */
3771 if (htab->sgotplt->size > 0)
3772 {
3773 bfd_put_32 (output_bfd,
3774 (sdyn == NULL ? 0
3775 : sdyn->output_section->vma + sdyn->output_offset),
3776 htab->sgotplt->contents);
3777 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3778 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3779 }
3780
3781 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3782 }
3783
3784 if (htab->sgot && htab->sgot->size > 0)
3785 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3786
3787 return TRUE;
3788 }
3789
3790 /* Return address for Ith PLT stub in section PLT, for relocation REL
3791 or (bfd_vma) -1 if it should not be included. */
3792
3793 static bfd_vma
3794 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3795 const arelent *rel ATTRIBUTE_UNUSED)
3796 {
3797 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3798 }
3799
3800 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
3801
3802 static bfd_boolean
3803 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
3804 {
3805 if (h->plt.offset != (bfd_vma) -1
3806 && !h->def_regular
3807 && !h->pointer_equality_needed)
3808 return FALSE;
3809
3810 return _bfd_elf_hash_symbol (h);
3811 }
3812
3813 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3814 #define TARGET_LITTLE_NAME "elf32-i386"
3815 #define ELF_ARCH bfd_arch_i386
3816 #define ELF_MACHINE_CODE EM_386
3817 #define ELF_MAXPAGESIZE 0x1000
3818
3819 #define elf_backend_can_gc_sections 1
3820 #define elf_backend_can_refcount 1
3821 #define elf_backend_want_got_plt 1
3822 #define elf_backend_plt_readonly 1
3823 #define elf_backend_want_plt_sym 0
3824 #define elf_backend_got_header_size 12
3825
3826 /* Support RELA for objdump of prelink objects. */
3827 #define elf_info_to_howto elf_i386_info_to_howto_rel
3828 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3829
3830 #define bfd_elf32_mkobject elf_i386_mkobject
3831
3832 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3833 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3834 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3835 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
3836
3837 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3838 #define elf_backend_check_relocs elf_i386_check_relocs
3839 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3840 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3841 #define elf_backend_fake_sections elf_i386_fake_sections
3842 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3843 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3844 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3845 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3846 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3847 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3848 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3849 #define elf_backend_relocate_section elf_i386_relocate_section
3850 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3851 #define elf_backend_always_size_sections elf_i386_always_size_sections
3852 #define elf_backend_omit_section_dynsym \
3853 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
3854 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
3855 #define elf_backend_hash_symbol elf_i386_hash_symbol
3856
3857 #include "elf32-target.h"
3858
3859 /* FreeBSD support. */
3860
3861 #undef TARGET_LITTLE_SYM
3862 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3863 #undef TARGET_LITTLE_NAME
3864 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3865 #undef ELF_OSABI
3866 #define ELF_OSABI ELFOSABI_FREEBSD
3867
3868 /* The kernel recognizes executables as valid only if they carry a
3869 "FreeBSD" label in the ELF header. So we put this label on all
3870 executables and (for simplicity) also all other object files. */
3871
3872 static void
3873 elf_i386_post_process_headers (bfd *abfd,
3874 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3875 {
3876 Elf_Internal_Ehdr *i_ehdrp;
3877
3878 i_ehdrp = elf_elfheader (abfd);
3879
3880 /* Put an ABI label supported by FreeBSD >= 4.1. */
3881 i_ehdrp->e_ident[EI_OSABI] = get_elf_backend_data (abfd)->elf_osabi;
3882 #ifdef OLD_FREEBSD_ABI_LABEL
3883 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3884 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3885 #endif
3886 }
3887
3888 #undef elf_backend_post_process_headers
3889 #define elf_backend_post_process_headers elf_i386_post_process_headers
3890 #undef elf32_bed
3891 #define elf32_bed elf32_i386_fbsd_bed
3892
3893 #include "elf32-target.h"
3894
3895 /* VxWorks support. */
3896
3897 #undef TARGET_LITTLE_SYM
3898 #define TARGET_LITTLE_SYM bfd_elf32_i386_vxworks_vec
3899 #undef TARGET_LITTLE_NAME
3900 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
3901 #undef ELF_OSABI
3902
3903 /* Like elf_i386_link_hash_table_create but with tweaks for VxWorks. */
3904
3905 static struct bfd_link_hash_table *
3906 elf_i386_vxworks_link_hash_table_create (bfd *abfd)
3907 {
3908 struct bfd_link_hash_table *ret;
3909 struct elf_i386_link_hash_table *htab;
3910
3911 ret = elf_i386_link_hash_table_create (abfd);
3912 if (ret)
3913 {
3914 htab = (struct elf_i386_link_hash_table *) ret;
3915 htab->is_vxworks = 1;
3916 htab->plt0_pad_byte = 0x90;
3917 }
3918
3919 return ret;
3920 }
3921
3922
3923 #undef elf_backend_post_process_headers
3924 #undef bfd_elf32_bfd_link_hash_table_create
3925 #define bfd_elf32_bfd_link_hash_table_create \
3926 elf_i386_vxworks_link_hash_table_create
3927 #undef elf_backend_add_symbol_hook
3928 #define elf_backend_add_symbol_hook \
3929 elf_vxworks_add_symbol_hook
3930 #undef elf_backend_link_output_symbol_hook
3931 #define elf_backend_link_output_symbol_hook \
3932 elf_vxworks_link_output_symbol_hook
3933 #undef elf_backend_emit_relocs
3934 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
3935 #undef elf_backend_final_write_processing
3936 #define elf_backend_final_write_processing \
3937 elf_vxworks_final_write_processing
3938
3939 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
3940 define it. */
3941 #undef elf_backend_want_plt_sym
3942 #define elf_backend_want_plt_sym 1
3943
3944 #undef elf32_bed
3945 #define elf32_bed elf32_i386_vxworks_bed
3946
3947 #include "elf32-target.h"
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