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* elf64-ppc.c (ppc_get_stub_entry): Change third param to a
[binutils.git] / bfd / elf32-i386.c
blob5eb34abe62ff27e3e77313f812e92ba5c60eb228
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 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21 #include "bfd.h"
22 #include "sysdep.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26
27 /* 386 uses REL relocations instead of RELA. */
28 #define USE_REL 1
29
30 #include "elf/i386.h"
31
32 static reloc_howto_type elf_howto_table[]=
33 {
34 HOWTO(R_386_NONE, 0, 0, 0, FALSE, 0, complain_overflow_bitfield,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
67
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
74
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
106
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128
129 /* Another gap. */
130 #define R_386_tls (R_386_TLS_TPOFF32 + 1 - R_386_tls_offset)
131 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_tls)
132
133 /* GNU extension to record C++ vtable hierarchy. */
134 HOWTO (R_386_GNU_VTINHERIT, /* type */
135 0, /* rightshift */
136 2, /* size (0 = byte, 1 = short, 2 = long) */
137 0, /* bitsize */
138 FALSE, /* pc_relative */
139 0, /* bitpos */
140 complain_overflow_dont, /* complain_on_overflow */
141 NULL, /* special_function */
142 "R_386_GNU_VTINHERIT", /* name */
143 FALSE, /* partial_inplace */
144 0, /* src_mask */
145 0, /* dst_mask */
146 FALSE), /* pcrel_offset */
147
148 /* GNU extension to record C++ vtable member usage. */
149 HOWTO (R_386_GNU_VTENTRY, /* type */
150 0, /* rightshift */
151 2, /* size (0 = byte, 1 = short, 2 = long) */
152 0, /* bitsize */
153 FALSE, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
157 "R_386_GNU_VTENTRY", /* name */
158 FALSE, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
161 FALSE) /* pcrel_offset */
162
163 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
164
165 };
166
167 #ifdef DEBUG_GEN_RELOC
168 #define TRACE(str) \
169 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
170 #else
171 #define TRACE(str)
172 #endif
173
174 static reloc_howto_type *
175 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
176 bfd_reloc_code_real_type code)
177 {
178 switch (code)
179 {
180 case BFD_RELOC_NONE:
181 TRACE ("BFD_RELOC_NONE");
182 return &elf_howto_table[R_386_NONE];
183
184 case BFD_RELOC_32:
185 TRACE ("BFD_RELOC_32");
186 return &elf_howto_table[R_386_32];
187
188 case BFD_RELOC_CTOR:
189 TRACE ("BFD_RELOC_CTOR");
190 return &elf_howto_table[R_386_32];
191
192 case BFD_RELOC_32_PCREL:
193 TRACE ("BFD_RELOC_PC32");
194 return &elf_howto_table[R_386_PC32];
195
196 case BFD_RELOC_386_GOT32:
197 TRACE ("BFD_RELOC_386_GOT32");
198 return &elf_howto_table[R_386_GOT32];
199
200 case BFD_RELOC_386_PLT32:
201 TRACE ("BFD_RELOC_386_PLT32");
202 return &elf_howto_table[R_386_PLT32];
203
204 case BFD_RELOC_386_COPY:
205 TRACE ("BFD_RELOC_386_COPY");
206 return &elf_howto_table[R_386_COPY];
207
208 case BFD_RELOC_386_GLOB_DAT:
209 TRACE ("BFD_RELOC_386_GLOB_DAT");
210 return &elf_howto_table[R_386_GLOB_DAT];
211
212 case BFD_RELOC_386_JUMP_SLOT:
213 TRACE ("BFD_RELOC_386_JUMP_SLOT");
214 return &elf_howto_table[R_386_JUMP_SLOT];
215
216 case BFD_RELOC_386_RELATIVE:
217 TRACE ("BFD_RELOC_386_RELATIVE");
218 return &elf_howto_table[R_386_RELATIVE];
219
220 case BFD_RELOC_386_GOTOFF:
221 TRACE ("BFD_RELOC_386_GOTOFF");
222 return &elf_howto_table[R_386_GOTOFF];
223
224 case BFD_RELOC_386_GOTPC:
225 TRACE ("BFD_RELOC_386_GOTPC");
226 return &elf_howto_table[R_386_GOTPC];
227
228 /* These relocs are a GNU extension. */
229 case BFD_RELOC_386_TLS_TPOFF:
230 TRACE ("BFD_RELOC_386_TLS_TPOFF");
231 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
232
233 case BFD_RELOC_386_TLS_IE:
234 TRACE ("BFD_RELOC_386_TLS_IE");
235 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
236
237 case BFD_RELOC_386_TLS_GOTIE:
238 TRACE ("BFD_RELOC_386_TLS_GOTIE");
239 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
240
241 case BFD_RELOC_386_TLS_LE:
242 TRACE ("BFD_RELOC_386_TLS_LE");
243 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
244
245 case BFD_RELOC_386_TLS_GD:
246 TRACE ("BFD_RELOC_386_TLS_GD");
247 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
248
249 case BFD_RELOC_386_TLS_LDM:
250 TRACE ("BFD_RELOC_386_TLS_LDM");
251 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
252
253 case BFD_RELOC_16:
254 TRACE ("BFD_RELOC_16");
255 return &elf_howto_table[R_386_16 - R_386_ext_offset];
256
257 case BFD_RELOC_16_PCREL:
258 TRACE ("BFD_RELOC_16_PCREL");
259 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
260
261 case BFD_RELOC_8:
262 TRACE ("BFD_RELOC_8");
263 return &elf_howto_table[R_386_8 - R_386_ext_offset];
264
265 case BFD_RELOC_8_PCREL:
266 TRACE ("BFD_RELOC_8_PCREL");
267 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
268
269 /* Common with Sun TLS implementation. */
270 case BFD_RELOC_386_TLS_LDO_32:
271 TRACE ("BFD_RELOC_386_TLS_LDO_32");
272 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
273
274 case BFD_RELOC_386_TLS_IE_32:
275 TRACE ("BFD_RELOC_386_TLS_IE_32");
276 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
277
278 case BFD_RELOC_386_TLS_LE_32:
279 TRACE ("BFD_RELOC_386_TLS_LE_32");
280 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
281
282 case BFD_RELOC_386_TLS_DTPMOD32:
283 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
284 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
285
286 case BFD_RELOC_386_TLS_DTPOFF32:
287 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
288 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
289
290 case BFD_RELOC_386_TLS_TPOFF32:
291 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
292 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
293
294 case BFD_RELOC_VTABLE_INHERIT:
295 TRACE ("BFD_RELOC_VTABLE_INHERIT");
296 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
297
298 case BFD_RELOC_VTABLE_ENTRY:
299 TRACE ("BFD_RELOC_VTABLE_ENTRY");
300 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
301
302 default:
303 break;
304 }
305
306 TRACE ("Unknown");
307 return 0;
308 }
309
310 static void
311 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
312 arelent *cache_ptr,
313 Elf_Internal_Rela *dst)
314 {
315 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
316 unsigned int indx;
317
318 if ((indx = r_type) >= R_386_standard
319 && ((indx = r_type - R_386_ext_offset) - R_386_standard
320 >= R_386_ext - R_386_standard)
321 && ((indx = r_type - R_386_tls_offset) - R_386_ext
322 >= R_386_tls - R_386_ext)
323 && ((indx = r_type - R_386_vt_offset) - R_386_tls
324 >= R_386_vt - R_386_tls))
325 {
326 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
327 abfd, (int) r_type);
328 indx = R_386_NONE;
329 }
330 cache_ptr->howto = &elf_howto_table[indx];
331 }
332
333 /* Return whether a symbol name implies a local label. The UnixWare
334 2.1 cc generates temporary symbols that start with .X, so we
335 recognize them here. FIXME: do other SVR4 compilers also use .X?.
336 If so, we should move the .X recognition into
337 _bfd_elf_is_local_label_name. */
338
339 static bfd_boolean
340 elf_i386_is_local_label_name (bfd *abfd, const char *name)
341 {
342 if (name[0] == '.' && name[1] == 'X')
343 return TRUE;
344
345 return _bfd_elf_is_local_label_name (abfd, name);
346 }
347 \f
348 /* Support for core dump NOTE sections. */
349
350 static bfd_boolean
351 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
352 {
353 int offset;
354 size_t size;
355
356 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
357 {
358 int pr_version = bfd_get_32 (abfd, note->descdata);
359
360 if (pr_version != 1)
361 return FALSE;
362
363 /* pr_cursig */
364 elf_tdata (abfd)->core_signal = bfd_get_32 (abfd, note->descdata + 20);
365
366 /* pr_pid */
367 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
368
369 /* pr_reg */
370 offset = 28;
371 size = bfd_get_32 (abfd, note->descdata + 8);
372 }
373 else
374 {
375 switch (note->descsz)
376 {
377 default:
378 return FALSE;
379
380 case 144: /* Linux/i386 */
381 /* pr_cursig */
382 elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12);
383
384 /* pr_pid */
385 elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24);
386
387 /* pr_reg */
388 offset = 72;
389 size = 68;
390
391 break;
392 }
393 }
394
395 /* Make a ".reg/999" section. */
396 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
397 size, note->descpos + offset);
398 }
399
400 static bfd_boolean
401 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
402 {
403 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
404 {
405 int pr_version = bfd_get_32 (abfd, note->descdata);
406
407 if (pr_version != 1)
408 return FALSE;
409
410 elf_tdata (abfd)->core_program
411 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
412 elf_tdata (abfd)->core_command
413 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
414 }
415 else
416 {
417 switch (note->descsz)
418 {
419 default:
420 return FALSE;
421
422 case 124: /* Linux/i386 elf_prpsinfo. */
423 elf_tdata (abfd)->core_program
424 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
425 elf_tdata (abfd)->core_command
426 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
427 }
428 }
429
430 /* Note that for some reason, a spurious space is tacked
431 onto the end of the args in some (at least one anyway)
432 implementations, so strip it off if it exists. */
433 {
434 char *command = elf_tdata (abfd)->core_command;
435 int n = strlen (command);
436
437 if (0 < n && command[n - 1] == ' ')
438 command[n - 1] = '\0';
439 }
440
441 return TRUE;
442 }
443 \f
444 /* Functions for the i386 ELF linker.
445
446 In order to gain some understanding of code in this file without
447 knowing all the intricate details of the linker, note the
448 following:
449
450 Functions named elf_i386_* are called by external routines, other
451 functions are only called locally. elf_i386_* functions appear
452 in this file more or less in the order in which they are called
453 from external routines. eg. elf_i386_check_relocs is called
454 early in the link process, elf_i386_finish_dynamic_sections is
455 one of the last functions. */
456
457
458 /* The name of the dynamic interpreter. This is put in the .interp
459 section. */
460
461 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
462
463 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
464 copying dynamic variables from a shared lib into an app's dynbss
465 section, and instead use a dynamic relocation to point into the
466 shared lib. */
467 #define ELIMINATE_COPY_RELOCS 1
468
469 /* The size in bytes of an entry in the procedure linkage table. */
470
471 #define PLT_ENTRY_SIZE 16
472
473 /* The first entry in an absolute procedure linkage table looks like
474 this. See the SVR4 ABI i386 supplement to see how this works. */
475
476 static const bfd_byte elf_i386_plt0_entry[PLT_ENTRY_SIZE] =
477 {
478 0xff, 0x35, /* pushl contents of address */
479 0, 0, 0, 0, /* replaced with address of .got + 4. */
480 0xff, 0x25, /* jmp indirect */
481 0, 0, 0, 0, /* replaced with address of .got + 8. */
482 0, 0, 0, 0 /* pad out to 16 bytes. */
483 };
484
485 /* Subsequent entries in an absolute procedure linkage table look like
486 this. */
487
488 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
489 {
490 0xff, 0x25, /* jmp indirect */
491 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
492 0x68, /* pushl immediate */
493 0, 0, 0, 0, /* replaced with offset into relocation table. */
494 0xe9, /* jmp relative */
495 0, 0, 0, 0 /* replaced with offset to start of .plt. */
496 };
497
498 /* The first entry in a PIC procedure linkage table look like this. */
499
500 static const bfd_byte elf_i386_pic_plt0_entry[PLT_ENTRY_SIZE] =
501 {
502 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
503 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
504 0, 0, 0, 0 /* pad out to 16 bytes. */
505 };
506
507 /* Subsequent entries in a PIC procedure linkage table look like this. */
508
509 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
510 {
511 0xff, 0xa3, /* jmp *offset(%ebx) */
512 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
513 0x68, /* pushl immediate */
514 0, 0, 0, 0, /* replaced with offset into relocation table. */
515 0xe9, /* jmp relative */
516 0, 0, 0, 0 /* replaced with offset to start of .plt. */
517 };
518
519 /* The i386 linker needs to keep track of the number of relocs that it
520 decides to copy as dynamic relocs in check_relocs for each symbol.
521 This is so that it can later discard them if they are found to be
522 unnecessary. We store the information in a field extending the
523 regular ELF linker hash table. */
524
525 struct elf_i386_dyn_relocs
526 {
527 struct elf_i386_dyn_relocs *next;
528
529 /* The input section of the reloc. */
530 asection *sec;
531
532 /* Total number of relocs copied for the input section. */
533 bfd_size_type count;
534
535 /* Number of pc-relative relocs copied for the input section. */
536 bfd_size_type pc_count;
537 };
538
539 /* i386 ELF linker hash entry. */
540
541 struct elf_i386_link_hash_entry
542 {
543 struct elf_link_hash_entry elf;
544
545 /* Track dynamic relocs copied for this symbol. */
546 struct elf_i386_dyn_relocs *dyn_relocs;
547
548 #define GOT_UNKNOWN 0
549 #define GOT_NORMAL 1
550 #define GOT_TLS_GD 2
551 #define GOT_TLS_IE 4
552 #define GOT_TLS_IE_POS 5
553 #define GOT_TLS_IE_NEG 6
554 #define GOT_TLS_IE_BOTH 7
555 unsigned char tls_type;
556 };
557
558 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
559
560 struct elf_i386_obj_tdata
561 {
562 struct elf_obj_tdata root;
563
564 /* tls_type for each local got entry. */
565 char *local_got_tls_type;
566 };
567
568 #define elf_i386_tdata(abfd) \
569 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
570
571 #define elf_i386_local_got_tls_type(abfd) \
572 (elf_i386_tdata (abfd)->local_got_tls_type)
573
574 static bfd_boolean
575 elf_i386_mkobject (bfd *abfd)
576 {
577 bfd_size_type amt = sizeof (struct elf_i386_obj_tdata);
578 abfd->tdata.any = bfd_zalloc (abfd, amt);
579 if (abfd->tdata.any == NULL)
580 return FALSE;
581 return TRUE;
582 }
583
584 /* i386 ELF linker hash table. */
585
586 struct elf_i386_link_hash_table
587 {
588 struct elf_link_hash_table elf;
589
590 /* Short-cuts to get to dynamic linker sections. */
591 asection *sgot;
592 asection *sgotplt;
593 asection *srelgot;
594 asection *splt;
595 asection *srelplt;
596 asection *sdynbss;
597 asection *srelbss;
598
599 union {
600 bfd_signed_vma refcount;
601 bfd_vma offset;
602 } tls_ldm_got;
603
604 /* Small local sym to section mapping cache. */
605 struct sym_sec_cache sym_sec;
606 };
607
608 /* Get the i386 ELF linker hash table from a link_info structure. */
609
610 #define elf_i386_hash_table(p) \
611 ((struct elf_i386_link_hash_table *) ((p)->hash))
612
613 /* Create an entry in an i386 ELF linker hash table. */
614
615 static struct bfd_hash_entry *
616 link_hash_newfunc (struct bfd_hash_entry *entry,
617 struct bfd_hash_table *table,
618 const char *string)
619 {
620 /* Allocate the structure if it has not already been allocated by a
621 subclass. */
622 if (entry == NULL)
623 {
624 entry = bfd_hash_allocate (table,
625 sizeof (struct elf_i386_link_hash_entry));
626 if (entry == NULL)
627 return entry;
628 }
629
630 /* Call the allocation method of the superclass. */
631 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
632 if (entry != NULL)
633 {
634 struct elf_i386_link_hash_entry *eh;
635
636 eh = (struct elf_i386_link_hash_entry *) entry;
637 eh->dyn_relocs = NULL;
638 eh->tls_type = GOT_UNKNOWN;
639 }
640
641 return entry;
642 }
643
644 /* Create an i386 ELF linker hash table. */
645
646 static struct bfd_link_hash_table *
647 elf_i386_link_hash_table_create (bfd *abfd)
648 {
649 struct elf_i386_link_hash_table *ret;
650 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
651
652 ret = bfd_malloc (amt);
653 if (ret == NULL)
654 return NULL;
655
656 if (! _bfd_elf_link_hash_table_init (&ret->elf, abfd, link_hash_newfunc))
657 {
658 free (ret);
659 return NULL;
660 }
661
662 ret->sgot = NULL;
663 ret->sgotplt = NULL;
664 ret->srelgot = NULL;
665 ret->splt = NULL;
666 ret->srelplt = NULL;
667 ret->sdynbss = NULL;
668 ret->srelbss = NULL;
669 ret->tls_ldm_got.refcount = 0;
670 ret->sym_sec.abfd = NULL;
671
672 return &ret->elf.root;
673 }
674
675 /* Create .got, .gotplt, and .rel.got sections in DYNOBJ, and set up
676 shortcuts to them in our hash table. */
677
678 static bfd_boolean
679 create_got_section (bfd *dynobj, struct bfd_link_info *info)
680 {
681 struct elf_i386_link_hash_table *htab;
682
683 if (! _bfd_elf_create_got_section (dynobj, info))
684 return FALSE;
685
686 htab = elf_i386_hash_table (info);
687 htab->sgot = bfd_get_section_by_name (dynobj, ".got");
688 htab->sgotplt = bfd_get_section_by_name (dynobj, ".got.plt");
689 if (!htab->sgot || !htab->sgotplt)
690 abort ();
691
692 htab->srelgot = bfd_make_section (dynobj, ".rel.got");
693 if (htab->srelgot == NULL
694 || ! bfd_set_section_flags (dynobj, htab->srelgot,
695 (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS
696 | SEC_IN_MEMORY | SEC_LINKER_CREATED
697 | SEC_READONLY))
698 || ! bfd_set_section_alignment (dynobj, htab->srelgot, 2))
699 return FALSE;
700 return TRUE;
701 }
702
703 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
704 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
705 hash table. */
706
707 static bfd_boolean
708 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
709 {
710 struct elf_i386_link_hash_table *htab;
711
712 htab = elf_i386_hash_table (info);
713 if (!htab->sgot && !create_got_section (dynobj, info))
714 return FALSE;
715
716 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
717 return FALSE;
718
719 htab->splt = bfd_get_section_by_name (dynobj, ".plt");
720 htab->srelplt = bfd_get_section_by_name (dynobj, ".rel.plt");
721 htab->sdynbss = bfd_get_section_by_name (dynobj, ".dynbss");
722 if (!info->shared)
723 htab->srelbss = bfd_get_section_by_name (dynobj, ".rel.bss");
724
725 if (!htab->splt || !htab->srelplt || !htab->sdynbss
726 || (!info->shared && !htab->srelbss))
727 abort ();
728
729 return TRUE;
730 }
731
732 /* Copy the extra info we tack onto an elf_link_hash_entry. */
733
734 static void
735 elf_i386_copy_indirect_symbol (const struct elf_backend_data *bed,
736 struct elf_link_hash_entry *dir,
737 struct elf_link_hash_entry *ind)
738 {
739 struct elf_i386_link_hash_entry *edir, *eind;
740
741 edir = (struct elf_i386_link_hash_entry *) dir;
742 eind = (struct elf_i386_link_hash_entry *) ind;
743
744 if (eind->dyn_relocs != NULL)
745 {
746 if (edir->dyn_relocs != NULL)
747 {
748 struct elf_i386_dyn_relocs **pp;
749 struct elf_i386_dyn_relocs *p;
750
751 if (ind->root.type == bfd_link_hash_indirect)
752 abort ();
753
754 /* Add reloc counts against the weak sym to the strong sym
755 list. Merge any entries against the same section. */
756 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
757 {
758 struct elf_i386_dyn_relocs *q;
759
760 for (q = edir->dyn_relocs; q != NULL; q = q->next)
761 if (q->sec == p->sec)
762 {
763 q->pc_count += p->pc_count;
764 q->count += p->count;
765 *pp = p->next;
766 break;
767 }
768 if (q == NULL)
769 pp = &p->next;
770 }
771 *pp = edir->dyn_relocs;
772 }
773
774 edir->dyn_relocs = eind->dyn_relocs;
775 eind->dyn_relocs = NULL;
776 }
777
778 if (ind->root.type == bfd_link_hash_indirect
779 && dir->got.refcount <= 0)
780 {
781 edir->tls_type = eind->tls_type;
782 eind->tls_type = GOT_UNKNOWN;
783 }
784
785 if (ELIMINATE_COPY_RELOCS
786 && ind->root.type != bfd_link_hash_indirect
787 && (dir->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0)
788 /* If called to transfer flags for a weakdef during processing
789 of elf_adjust_dynamic_symbol, don't copy ELF_LINK_NON_GOT_REF.
790 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
791 dir->elf_link_hash_flags |=
792 (ind->elf_link_hash_flags & (ELF_LINK_HASH_REF_DYNAMIC
793 | ELF_LINK_HASH_REF_REGULAR
794 | ELF_LINK_HASH_REF_REGULAR_NONWEAK
795 | ELF_LINK_HASH_NEEDS_PLT
796 | ELF_LINK_POINTER_EQUALITY_NEEDED));
797 else
798 _bfd_elf_link_hash_copy_indirect (bed, dir, ind);
799 }
800
801 static int
802 elf_i386_tls_transition (struct bfd_link_info *info, int r_type, int is_local)
803 {
804 if (info->shared)
805 return r_type;
806
807 switch (r_type)
808 {
809 case R_386_TLS_GD:
810 case R_386_TLS_IE_32:
811 if (is_local)
812 return R_386_TLS_LE_32;
813 return R_386_TLS_IE_32;
814 case R_386_TLS_IE:
815 case R_386_TLS_GOTIE:
816 if (is_local)
817 return R_386_TLS_LE_32;
818 return r_type;
819 case R_386_TLS_LDM:
820 return R_386_TLS_LE_32;
821 }
822
823 return r_type;
824 }
825
826 /* Look through the relocs for a section during the first phase, and
827 calculate needed space in the global offset table, procedure linkage
828 table, and dynamic reloc sections. */
829
830 static bfd_boolean
831 elf_i386_check_relocs (bfd *abfd,
832 struct bfd_link_info *info,
833 asection *sec,
834 const Elf_Internal_Rela *relocs)
835 {
836 struct elf_i386_link_hash_table *htab;
837 Elf_Internal_Shdr *symtab_hdr;
838 struct elf_link_hash_entry **sym_hashes;
839 const Elf_Internal_Rela *rel;
840 const Elf_Internal_Rela *rel_end;
841 asection *sreloc;
842
843 if (info->relocatable)
844 return TRUE;
845
846 htab = elf_i386_hash_table (info);
847 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
848 sym_hashes = elf_sym_hashes (abfd);
849
850 sreloc = NULL;
851
852 rel_end = relocs + sec->reloc_count;
853 for (rel = relocs; rel < rel_end; rel++)
854 {
855 unsigned int r_type;
856 unsigned long r_symndx;
857 struct elf_link_hash_entry *h;
858
859 r_symndx = ELF32_R_SYM (rel->r_info);
860 r_type = ELF32_R_TYPE (rel->r_info);
861
862 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
863 {
864 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
865 abfd,
866 r_symndx);
867 return FALSE;
868 }
869
870 if (r_symndx < symtab_hdr->sh_info)
871 h = NULL;
872 else
873 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
874
875 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
876
877 switch (r_type)
878 {
879 case R_386_TLS_LDM:
880 htab->tls_ldm_got.refcount += 1;
881 goto create_got;
882
883 case R_386_PLT32:
884 /* This symbol requires a procedure linkage table entry. We
885 actually build the entry in adjust_dynamic_symbol,
886 because this might be a case of linking PIC code which is
887 never referenced by a dynamic object, in which case we
888 don't need to generate a procedure linkage table entry
889 after all. */
890
891 /* If this is a local symbol, we resolve it directly without
892 creating a procedure linkage table entry. */
893 if (h == NULL)
894 continue;
895
896 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_PLT;
897 h->plt.refcount += 1;
898 break;
899
900 case R_386_TLS_IE_32:
901 case R_386_TLS_IE:
902 case R_386_TLS_GOTIE:
903 if (info->shared)
904 info->flags |= DF_STATIC_TLS;
905 /* Fall through */
906
907 case R_386_GOT32:
908 case R_386_TLS_GD:
909 /* This symbol requires a global offset table entry. */
910 {
911 int tls_type, old_tls_type;
912
913 switch (r_type)
914 {
915 default:
916 case R_386_GOT32: tls_type = GOT_NORMAL; break;
917 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
918 case R_386_TLS_IE_32:
919 if (ELF32_R_TYPE (rel->r_info) == r_type)
920 tls_type = GOT_TLS_IE_NEG;
921 else
922 /* If this is a GD->IE transition, we may use either of
923 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
924 tls_type = GOT_TLS_IE;
925 break;
926 case R_386_TLS_IE:
927 case R_386_TLS_GOTIE:
928 tls_type = GOT_TLS_IE_POS; break;
929 }
930
931 if (h != NULL)
932 {
933 h->got.refcount += 1;
934 old_tls_type = elf_i386_hash_entry(h)->tls_type;
935 }
936 else
937 {
938 bfd_signed_vma *local_got_refcounts;
939
940 /* This is a global offset table entry for a local symbol. */
941 local_got_refcounts = elf_local_got_refcounts (abfd);
942 if (local_got_refcounts == NULL)
943 {
944 bfd_size_type size;
945
946 size = symtab_hdr->sh_info;
947 size *= (sizeof (bfd_signed_vma) + sizeof(char));
948 local_got_refcounts = bfd_zalloc (abfd, size);
949 if (local_got_refcounts == NULL)
950 return FALSE;
951 elf_local_got_refcounts (abfd) = local_got_refcounts;
952 elf_i386_local_got_tls_type (abfd)
953 = (char *) (local_got_refcounts + symtab_hdr->sh_info);
954 }
955 local_got_refcounts[r_symndx] += 1;
956 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
957 }
958
959 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
960 tls_type |= old_tls_type;
961 /* If a TLS symbol is accessed using IE at least once,
962 there is no point to use dynamic model for it. */
963 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
964 && (old_tls_type != GOT_TLS_GD
965 || (tls_type & GOT_TLS_IE) == 0))
966 {
967 if ((old_tls_type & GOT_TLS_IE) && tls_type == GOT_TLS_GD)
968 tls_type = old_tls_type;
969 else
970 {
971 (*_bfd_error_handler)
972 (_("%B: `%s' accessed both as normal and "
973 "thread local symbol"),
974 abfd,
975 h ? h->root.root.string : "<local>");
976 return FALSE;
977 }
978 }
979
980 if (old_tls_type != tls_type)
981 {
982 if (h != NULL)
983 elf_i386_hash_entry (h)->tls_type = tls_type;
984 else
985 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
986 }
987 }
988 /* Fall through */
989
990 case R_386_GOTOFF:
991 case R_386_GOTPC:
992 create_got:
993 if (htab->sgot == NULL)
994 {
995 if (htab->elf.dynobj == NULL)
996 htab->elf.dynobj = abfd;
997 if (!create_got_section (htab->elf.dynobj, info))
998 return FALSE;
999 }
1000 if (r_type != R_386_TLS_IE)
1001 break;
1002 /* Fall through */
1003
1004 case R_386_TLS_LE_32:
1005 case R_386_TLS_LE:
1006 if (!info->shared)
1007 break;
1008 info->flags |= DF_STATIC_TLS;
1009 /* Fall through */
1010
1011 case R_386_32:
1012 case R_386_PC32:
1013 if (h != NULL && !info->shared)
1014 {
1015 /* If this reloc is in a read-only section, we might
1016 need a copy reloc. We can't check reliably at this
1017 stage whether the section is read-only, as input
1018 sections have not yet been mapped to output sections.
1019 Tentatively set the flag for now, and correct in
1020 adjust_dynamic_symbol. */
1021 h->elf_link_hash_flags |= ELF_LINK_NON_GOT_REF;
1022
1023 /* We may need a .plt entry if the function this reloc
1024 refers to is in a shared lib. */
1025 h->plt.refcount += 1;
1026 if (r_type != R_386_PC32)
1027 h->elf_link_hash_flags |= ELF_LINK_POINTER_EQUALITY_NEEDED;
1028 }
1029
1030 /* If we are creating a shared library, and this is a reloc
1031 against a global symbol, or a non PC relative reloc
1032 against a local symbol, then we need to copy the reloc
1033 into the shared library. However, if we are linking with
1034 -Bsymbolic, we do not need to copy a reloc against a
1035 global symbol which is defined in an object we are
1036 including in the link (i.e., DEF_REGULAR is set). At
1037 this point we have not seen all the input files, so it is
1038 possible that DEF_REGULAR is not set now but will be set
1039 later (it is never cleared). In case of a weak definition,
1040 DEF_REGULAR may be cleared later by a strong definition in
1041 a shared library. We account for that possibility below by
1042 storing information in the relocs_copied field of the hash
1043 table entry. A similar situation occurs when creating
1044 shared libraries and symbol visibility changes render the
1045 symbol local.
1046
1047 If on the other hand, we are creating an executable, we
1048 may need to keep relocations for symbols satisfied by a
1049 dynamic library if we manage to avoid copy relocs for the
1050 symbol. */
1051 if ((info->shared
1052 && (sec->flags & SEC_ALLOC) != 0
1053 && (r_type != R_386_PC32
1054 || (h != NULL
1055 && (! info->symbolic
1056 || h->root.type == bfd_link_hash_defweak
1057 || (h->elf_link_hash_flags
1058 & ELF_LINK_HASH_DEF_REGULAR) == 0))))
1059 || (ELIMINATE_COPY_RELOCS
1060 && !info->shared
1061 && (sec->flags & SEC_ALLOC) != 0
1062 && h != NULL
1063 && (h->root.type == bfd_link_hash_defweak
1064 || (h->elf_link_hash_flags
1065 & ELF_LINK_HASH_DEF_REGULAR) == 0)))
1066 {
1067 struct elf_i386_dyn_relocs *p;
1068 struct elf_i386_dyn_relocs **head;
1069
1070 /* We must copy these reloc types into the output file.
1071 Create a reloc section in dynobj and make room for
1072 this reloc. */
1073 if (sreloc == NULL)
1074 {
1075 const char *name;
1076 bfd *dynobj;
1077 unsigned int strndx = elf_elfheader (abfd)->e_shstrndx;
1078 unsigned int shnam = elf_section_data (sec)->rel_hdr.sh_name;
1079
1080 name = bfd_elf_string_from_elf_section (abfd, strndx, shnam);
1081 if (name == NULL)
1082 return FALSE;
1083
1084 if (strncmp (name, ".rel", 4) != 0
1085 || strcmp (bfd_get_section_name (abfd, sec),
1086 name + 4) != 0)
1087 {
1088 (*_bfd_error_handler)
1089 (_("%B: bad relocation section name `%s\'"),
1090 abfd, name);
1091 }
1092
1093 if (htab->elf.dynobj == NULL)
1094 htab->elf.dynobj = abfd;
1095
1096 dynobj = htab->elf.dynobj;
1097 sreloc = bfd_get_section_by_name (dynobj, name);
1098 if (sreloc == NULL)
1099 {
1100 flagword flags;
1101
1102 sreloc = bfd_make_section (dynobj, name);
1103 flags = (SEC_HAS_CONTENTS | SEC_READONLY
1104 | SEC_IN_MEMORY | SEC_LINKER_CREATED);
1105 if ((sec->flags & SEC_ALLOC) != 0)
1106 flags |= SEC_ALLOC | SEC_LOAD;
1107 if (sreloc == NULL
1108 || ! bfd_set_section_flags (dynobj, sreloc, flags)
1109 || ! bfd_set_section_alignment (dynobj, sreloc, 2))
1110 return FALSE;
1111 }
1112 elf_section_data (sec)->sreloc = sreloc;
1113 }
1114
1115 /* If this is a global symbol, we count the number of
1116 relocations we need for this symbol. */
1117 if (h != NULL)
1118 {
1119 head = &((struct elf_i386_link_hash_entry *) h)->dyn_relocs;
1120 }
1121 else
1122 {
1123 /* Track dynamic relocs needed for local syms too.
1124 We really need local syms available to do this
1125 easily. Oh well. */
1126
1127 asection *s;
1128 s = bfd_section_from_r_symndx (abfd, &htab->sym_sec,
1129 sec, r_symndx);
1130 if (s == NULL)
1131 return FALSE;
1132
1133 head = ((struct elf_i386_dyn_relocs **)
1134 &elf_section_data (s)->local_dynrel);
1135 }
1136
1137 p = *head;
1138 if (p == NULL || p->sec != sec)
1139 {
1140 bfd_size_type amt = sizeof *p;
1141 p = bfd_alloc (htab->elf.dynobj, amt);
1142 if (p == NULL)
1143 return FALSE;
1144 p->next = *head;
1145 *head = p;
1146 p->sec = sec;
1147 p->count = 0;
1148 p->pc_count = 0;
1149 }
1150
1151 p->count += 1;
1152 if (r_type == R_386_PC32)
1153 p->pc_count += 1;
1154 }
1155 break;
1156
1157 /* This relocation describes the C++ object vtable hierarchy.
1158 Reconstruct it for later use during GC. */
1159 case R_386_GNU_VTINHERIT:
1160 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1161 return FALSE;
1162 break;
1163
1164 /* This relocation describes which C++ vtable entries are actually
1165 used. Record for later use during GC. */
1166 case R_386_GNU_VTENTRY:
1167 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1168 return FALSE;
1169 break;
1170
1171 default:
1172 break;
1173 }
1174 }
1175
1176 return TRUE;
1177 }
1178
1179 /* Return the section that should be marked against GC for a given
1180 relocation. */
1181
1182 static asection *
1183 elf_i386_gc_mark_hook (asection *sec,
1184 struct bfd_link_info *info ATTRIBUTE_UNUSED,
1185 Elf_Internal_Rela *rel,
1186 struct elf_link_hash_entry *h,
1187 Elf_Internal_Sym *sym)
1188 {
1189 if (h != NULL)
1190 {
1191 switch (ELF32_R_TYPE (rel->r_info))
1192 {
1193 case R_386_GNU_VTINHERIT:
1194 case R_386_GNU_VTENTRY:
1195 break;
1196
1197 default:
1198 switch (h->root.type)
1199 {
1200 case bfd_link_hash_defined:
1201 case bfd_link_hash_defweak:
1202 return h->root.u.def.section;
1203
1204 case bfd_link_hash_common:
1205 return h->root.u.c.p->section;
1206
1207 default:
1208 break;
1209 }
1210 }
1211 }
1212 else
1213 return bfd_section_from_elf_index (sec->owner, sym->st_shndx);
1214
1215 return NULL;
1216 }
1217
1218 /* Update the got entry reference counts for the section being removed. */
1219
1220 static bfd_boolean
1221 elf_i386_gc_sweep_hook (bfd *abfd,
1222 struct bfd_link_info *info,
1223 asection *sec,
1224 const Elf_Internal_Rela *relocs)
1225 {
1226 Elf_Internal_Shdr *symtab_hdr;
1227 struct elf_link_hash_entry **sym_hashes;
1228 bfd_signed_vma *local_got_refcounts;
1229 const Elf_Internal_Rela *rel, *relend;
1230
1231 elf_section_data (sec)->local_dynrel = NULL;
1232
1233 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
1234 sym_hashes = elf_sym_hashes (abfd);
1235 local_got_refcounts = elf_local_got_refcounts (abfd);
1236
1237 relend = relocs + sec->reloc_count;
1238 for (rel = relocs; rel < relend; rel++)
1239 {
1240 unsigned long r_symndx;
1241 unsigned int r_type;
1242 struct elf_link_hash_entry *h = NULL;
1243
1244 r_symndx = ELF32_R_SYM (rel->r_info);
1245 if (r_symndx >= symtab_hdr->sh_info)
1246 {
1247 struct elf_i386_link_hash_entry *eh;
1248 struct elf_i386_dyn_relocs **pp;
1249 struct elf_i386_dyn_relocs *p;
1250
1251 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1252 eh = (struct elf_i386_link_hash_entry *) h;
1253
1254 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
1255 if (p->sec == sec)
1256 {
1257 /* Everything must go for SEC. */
1258 *pp = p->next;
1259 break;
1260 }
1261 }
1262
1263 r_type = ELF32_R_TYPE (rel->r_info);
1264 r_type = elf_i386_tls_transition (info, r_type, h != NULL);
1265 switch (r_type)
1266 {
1267 case R_386_TLS_LDM:
1268 if (elf_i386_hash_table (info)->tls_ldm_got.refcount > 0)
1269 elf_i386_hash_table (info)->tls_ldm_got.refcount -= 1;
1270 break;
1271
1272 case R_386_TLS_GD:
1273 case R_386_TLS_IE_32:
1274 case R_386_TLS_IE:
1275 case R_386_TLS_GOTIE:
1276 case R_386_GOT32:
1277 if (h != NULL)
1278 {
1279 if (h->got.refcount > 0)
1280 h->got.refcount -= 1;
1281 }
1282 else if (local_got_refcounts != NULL)
1283 {
1284 if (local_got_refcounts[r_symndx] > 0)
1285 local_got_refcounts[r_symndx] -= 1;
1286 }
1287 break;
1288
1289 case R_386_32:
1290 case R_386_PC32:
1291 if (info->shared)
1292 break;
1293 /* Fall through */
1294
1295 case R_386_PLT32:
1296 if (h != NULL)
1297 {
1298 if (h->plt.refcount > 0)
1299 h->plt.refcount -= 1;
1300 }
1301 break;
1302
1303 default:
1304 break;
1305 }
1306 }
1307
1308 return TRUE;
1309 }
1310
1311 /* Adjust a symbol defined by a dynamic object and referenced by a
1312 regular object. The current definition is in some section of the
1313 dynamic object, but we're not including those sections. We have to
1314 change the definition to something the rest of the link can
1315 understand. */
1316
1317 static bfd_boolean
1318 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
1319 struct elf_link_hash_entry *h)
1320 {
1321 struct elf_i386_link_hash_table *htab;
1322 asection *s;
1323 unsigned int power_of_two;
1324
1325 /* If this is a function, put it in the procedure linkage table. We
1326 will fill in the contents of the procedure linkage table later,
1327 when we know the address of the .got section. */
1328 if (h->type == STT_FUNC
1329 || (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0)
1330 {
1331 if (h->plt.refcount <= 0
1332 || SYMBOL_CALLS_LOCAL (info, h)
1333 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1334 && h->root.type == bfd_link_hash_undefweak))
1335 {
1336 /* This case can occur if we saw a PLT32 reloc in an input
1337 file, but the symbol was never referred to by a dynamic
1338 object, or if all references were garbage collected. In
1339 such a case, we don't actually need to build a procedure
1340 linkage table, and we can just do a PC32 reloc instead. */
1341 h->plt.offset = (bfd_vma) -1;
1342 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1343 }
1344
1345 return TRUE;
1346 }
1347 else
1348 /* It's possible that we incorrectly decided a .plt reloc was
1349 needed for an R_386_PC32 reloc to a non-function sym in
1350 check_relocs. We can't decide accurately between function and
1351 non-function syms in check-relocs; Objects loaded later in
1352 the link may change h->type. So fix it now. */
1353 h->plt.offset = (bfd_vma) -1;
1354
1355 /* If this is a weak symbol, and there is a real definition, the
1356 processor independent code will have arranged for us to see the
1357 real definition first, and we can just use the same value. */
1358 if (h->weakdef != NULL)
1359 {
1360 BFD_ASSERT (h->weakdef->root.type == bfd_link_hash_defined
1361 || h->weakdef->root.type == bfd_link_hash_defweak);
1362 h->root.u.def.section = h->weakdef->root.u.def.section;
1363 h->root.u.def.value = h->weakdef->root.u.def.value;
1364 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
1365 h->elf_link_hash_flags
1366 = ((h->elf_link_hash_flags & ~ELF_LINK_NON_GOT_REF)
1367 | (h->weakdef->elf_link_hash_flags & ELF_LINK_NON_GOT_REF));
1368 return TRUE;
1369 }
1370
1371 /* This is a reference to a symbol defined by a dynamic object which
1372 is not a function. */
1373
1374 /* If we are creating a shared library, we must presume that the
1375 only references to the symbol are via the global offset table.
1376 For such cases we need not do anything here; the relocations will
1377 be handled correctly by relocate_section. */
1378 if (info->shared)
1379 return TRUE;
1380
1381 /* If there are no references to this symbol that do not use the
1382 GOT, we don't need to generate a copy reloc. */
1383 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0)
1384 return TRUE;
1385
1386 /* If -z nocopyreloc was given, we won't generate them either. */
1387 if (info->nocopyreloc)
1388 {
1389 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1390 return TRUE;
1391 }
1392
1393 if (ELIMINATE_COPY_RELOCS)
1394 {
1395 struct elf_i386_link_hash_entry * eh;
1396 struct elf_i386_dyn_relocs *p;
1397
1398 eh = (struct elf_i386_link_hash_entry *) h;
1399 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1400 {
1401 s = p->sec->output_section;
1402 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1403 break;
1404 }
1405
1406 /* If we didn't find any dynamic relocs in read-only sections, then
1407 we'll be keeping the dynamic relocs and avoiding the copy reloc. */
1408 if (p == NULL)
1409 {
1410 h->elf_link_hash_flags &= ~ELF_LINK_NON_GOT_REF;
1411 return TRUE;
1412 }
1413 }
1414
1415 /* We must allocate the symbol in our .dynbss section, which will
1416 become part of the .bss section of the executable. There will be
1417 an entry for this symbol in the .dynsym section. The dynamic
1418 object will contain position independent code, so all references
1419 from the dynamic object to this symbol will go through the global
1420 offset table. The dynamic linker will use the .dynsym entry to
1421 determine the address it must put in the global offset table, so
1422 both the dynamic object and the regular object will refer to the
1423 same memory location for the variable. */
1424
1425 htab = elf_i386_hash_table (info);
1426
1427 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
1428 copy the initial value out of the dynamic object and into the
1429 runtime process image. */
1430 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0)
1431 {
1432 htab->srelbss->size += sizeof (Elf32_External_Rel);
1433 h->elf_link_hash_flags |= ELF_LINK_HASH_NEEDS_COPY;
1434 }
1435
1436 /* We need to figure out the alignment required for this symbol. I
1437 have no idea how ELF linkers handle this. */
1438 power_of_two = bfd_log2 (h->size);
1439 if (power_of_two > 3)
1440 power_of_two = 3;
1441
1442 /* Apply the required alignment. */
1443 s = htab->sdynbss;
1444 s->size = BFD_ALIGN (s->size, (bfd_size_type) (1 << power_of_two));
1445 if (power_of_two > bfd_get_section_alignment (htab->elf.dynobj, s))
1446 {
1447 if (! bfd_set_section_alignment (htab->elf.dynobj, s, power_of_two))
1448 return FALSE;
1449 }
1450
1451 /* Define the symbol as being at this point in the section. */
1452 h->root.u.def.section = s;
1453 h->root.u.def.value = s->size;
1454
1455 /* Increment the section size to make room for the symbol. */
1456 s->size += h->size;
1457
1458 return TRUE;
1459 }
1460
1461 /* Allocate space in .plt, .got and associated reloc sections for
1462 dynamic relocs. */
1463
1464 static bfd_boolean
1465 allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1466 {
1467 struct bfd_link_info *info;
1468 struct elf_i386_link_hash_table *htab;
1469 struct elf_i386_link_hash_entry *eh;
1470 struct elf_i386_dyn_relocs *p;
1471
1472 if (h->root.type == bfd_link_hash_indirect)
1473 return TRUE;
1474
1475 if (h->root.type == bfd_link_hash_warning)
1476 /* When warning symbols are created, they **replace** the "real"
1477 entry in the hash table, thus we never get to see the real
1478 symbol in a hash traversal. So look at it now. */
1479 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1480
1481 info = (struct bfd_link_info *) inf;
1482 htab = elf_i386_hash_table (info);
1483
1484 if (htab->elf.dynamic_sections_created
1485 && h->plt.refcount > 0)
1486 {
1487 /* Make sure this symbol is output as a dynamic symbol.
1488 Undefined weak syms won't yet be marked as dynamic. */
1489 if (h->dynindx == -1
1490 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1491 {
1492 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1493 return FALSE;
1494 }
1495
1496 if (info->shared
1497 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
1498 {
1499 asection *s = htab->splt;
1500
1501 /* If this is the first .plt entry, make room for the special
1502 first entry. */
1503 if (s->size == 0)
1504 s->size += PLT_ENTRY_SIZE;
1505
1506 h->plt.offset = s->size;
1507
1508 /* If this symbol is not defined in a regular file, and we are
1509 not generating a shared library, then set the symbol to this
1510 location in the .plt. This is required to make function
1511 pointers compare as equal between the normal executable and
1512 the shared library. */
1513 if (! info->shared
1514 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1515 {
1516 h->root.u.def.section = s;
1517 h->root.u.def.value = h->plt.offset;
1518 }
1519
1520 /* Make room for this entry. */
1521 s->size += PLT_ENTRY_SIZE;
1522
1523 /* We also need to make an entry in the .got.plt section, which
1524 will be placed in the .got section by the linker script. */
1525 htab->sgotplt->size += 4;
1526
1527 /* We also need to make an entry in the .rel.plt section. */
1528 htab->srelplt->size += sizeof (Elf32_External_Rel);
1529 }
1530 else
1531 {
1532 h->plt.offset = (bfd_vma) -1;
1533 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1534 }
1535 }
1536 else
1537 {
1538 h->plt.offset = (bfd_vma) -1;
1539 h->elf_link_hash_flags &= ~ELF_LINK_HASH_NEEDS_PLT;
1540 }
1541
1542 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
1543 make it a R_386_TLS_LE_32 requiring no TLS entry. */
1544 if (h->got.refcount > 0
1545 && !info->shared
1546 && h->dynindx == -1
1547 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
1548 h->got.offset = (bfd_vma) -1;
1549 else if (h->got.refcount > 0)
1550 {
1551 asection *s;
1552 bfd_boolean dyn;
1553 int tls_type = elf_i386_hash_entry(h)->tls_type;
1554
1555 /* Make sure this symbol is output as a dynamic symbol.
1556 Undefined weak syms won't yet be marked as dynamic. */
1557 if (h->dynindx == -1
1558 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1559 {
1560 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1561 return FALSE;
1562 }
1563
1564 s = htab->sgot;
1565 h->got.offset = s->size;
1566 s->size += 4;
1567 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
1568 if (tls_type == GOT_TLS_GD || tls_type == GOT_TLS_IE_BOTH)
1569 s->size += 4;
1570 dyn = htab->elf.dynamic_sections_created;
1571 /* R_386_TLS_IE_32 needs one dynamic relocation,
1572 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
1573 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
1574 need two), R_386_TLS_GD needs one if local symbol and two if
1575 global. */
1576 if (tls_type == GOT_TLS_IE_BOTH)
1577 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1578 else if ((tls_type == GOT_TLS_GD && h->dynindx == -1)
1579 || (tls_type & GOT_TLS_IE))
1580 htab->srelgot->size += sizeof (Elf32_External_Rel);
1581 else if (tls_type == GOT_TLS_GD)
1582 htab->srelgot->size += 2 * sizeof (Elf32_External_Rel);
1583 else if ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
1584 || h->root.type != bfd_link_hash_undefweak)
1585 && (info->shared
1586 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
1587 htab->srelgot->size += sizeof (Elf32_External_Rel);
1588 }
1589 else
1590 h->got.offset = (bfd_vma) -1;
1591
1592 eh = (struct elf_i386_link_hash_entry *) h;
1593 if (eh->dyn_relocs == NULL)
1594 return TRUE;
1595
1596 /* In the shared -Bsymbolic case, discard space allocated for
1597 dynamic pc-relative relocs against symbols which turn out to be
1598 defined in regular objects. For the normal shared case, discard
1599 space for pc-relative relocs that have become local due to symbol
1600 visibility changes. */
1601
1602 if (info->shared)
1603 {
1604 /* The only reloc that uses pc_count is R_386_PC32, which will
1605 appear on a call or on something like ".long foo - .". We
1606 want calls to protected symbols to resolve directly to the
1607 function rather than going via the plt. If people want
1608 function pointer comparisons to work as expected then they
1609 should avoid writing assembly like ".long foo - .". */
1610 if (SYMBOL_CALLS_LOCAL (info, h))
1611 {
1612 struct elf_i386_dyn_relocs **pp;
1613
1614 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
1615 {
1616 p->count -= p->pc_count;
1617 p->pc_count = 0;
1618 if (p->count == 0)
1619 *pp = p->next;
1620 else
1621 pp = &p->next;
1622 }
1623 }
1624
1625 /* Also discard relocs on undefined weak syms with non-default
1626 visibility. */
1627 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
1628 && h->root.type == bfd_link_hash_undefweak)
1629 eh->dyn_relocs = NULL;
1630 }
1631 else if (ELIMINATE_COPY_RELOCS)
1632 {
1633 /* For the non-shared case, discard space for relocs against
1634 symbols which turn out to need copy relocs or are not
1635 dynamic. */
1636
1637 if ((h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
1638 && (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0
1639 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
1640 || (htab->elf.dynamic_sections_created
1641 && (h->root.type == bfd_link_hash_undefweak
1642 || h->root.type == bfd_link_hash_undefined))))
1643 {
1644 /* Make sure this symbol is output as a dynamic symbol.
1645 Undefined weak syms won't yet be marked as dynamic. */
1646 if (h->dynindx == -1
1647 && (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0)
1648 {
1649 if (! bfd_elf_link_record_dynamic_symbol (info, h))
1650 return FALSE;
1651 }
1652
1653 /* If that succeeded, we know we'll be keeping all the
1654 relocs. */
1655 if (h->dynindx != -1)
1656 goto keep;
1657 }
1658
1659 eh->dyn_relocs = NULL;
1660
1661 keep: ;
1662 }
1663
1664 /* Finally, allocate space. */
1665 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1666 {
1667 asection *sreloc = elf_section_data (p->sec)->sreloc;
1668 sreloc->size += p->count * sizeof (Elf32_External_Rel);
1669 }
1670
1671 return TRUE;
1672 }
1673
1674 /* Find any dynamic relocs that apply to read-only sections. */
1675
1676 static bfd_boolean
1677 readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
1678 {
1679 struct elf_i386_link_hash_entry *eh;
1680 struct elf_i386_dyn_relocs *p;
1681
1682 if (h->root.type == bfd_link_hash_warning)
1683 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1684
1685 eh = (struct elf_i386_link_hash_entry *) h;
1686 for (p = eh->dyn_relocs; p != NULL; p = p->next)
1687 {
1688 asection *s = p->sec->output_section;
1689
1690 if (s != NULL && (s->flags & SEC_READONLY) != 0)
1691 {
1692 struct bfd_link_info *info = (struct bfd_link_info *) inf;
1693
1694 info->flags |= DF_TEXTREL;
1695
1696 /* Not an error, just cut short the traversal. */
1697 return FALSE;
1698 }
1699 }
1700 return TRUE;
1701 }
1702
1703 /* Set the sizes of the dynamic sections. */
1704
1705 static bfd_boolean
1706 elf_i386_size_dynamic_sections (bfd *output_bfd ATTRIBUTE_UNUSED,
1707 struct bfd_link_info *info)
1708 {
1709 struct elf_i386_link_hash_table *htab;
1710 bfd *dynobj;
1711 asection *s;
1712 bfd_boolean relocs;
1713 bfd *ibfd;
1714
1715 htab = elf_i386_hash_table (info);
1716 dynobj = htab->elf.dynobj;
1717 if (dynobj == NULL)
1718 abort ();
1719
1720 if (htab->elf.dynamic_sections_created)
1721 {
1722 /* Set the contents of the .interp section to the interpreter. */
1723 if (info->executable)
1724 {
1725 s = bfd_get_section_by_name (dynobj, ".interp");
1726 if (s == NULL)
1727 abort ();
1728 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
1729 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
1730 }
1731 }
1732
1733 /* Set up .got offsets for local syms, and space for local dynamic
1734 relocs. */
1735 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link_next)
1736 {
1737 bfd_signed_vma *local_got;
1738 bfd_signed_vma *end_local_got;
1739 char *local_tls_type;
1740 bfd_size_type locsymcount;
1741 Elf_Internal_Shdr *symtab_hdr;
1742 asection *srel;
1743
1744 if (bfd_get_flavour (ibfd) != bfd_target_elf_flavour)
1745 continue;
1746
1747 for (s = ibfd->sections; s != NULL; s = s->next)
1748 {
1749 struct elf_i386_dyn_relocs *p;
1750
1751 for (p = *((struct elf_i386_dyn_relocs **)
1752 &elf_section_data (s)->local_dynrel);
1753 p != NULL;
1754 p = p->next)
1755 {
1756 if (!bfd_is_abs_section (p->sec)
1757 && bfd_is_abs_section (p->sec->output_section))
1758 {
1759 /* Input section has been discarded, either because
1760 it is a copy of a linkonce section or due to
1761 linker script /DISCARD/, so we'll be discarding
1762 the relocs too. */
1763 }
1764 else if (p->count != 0)
1765 {
1766 srel = elf_section_data (p->sec)->sreloc;
1767 srel->size += p->count * sizeof (Elf32_External_Rel);
1768 if ((p->sec->output_section->flags & SEC_READONLY) != 0)
1769 info->flags |= DF_TEXTREL;
1770 }
1771 }
1772 }
1773
1774 local_got = elf_local_got_refcounts (ibfd);
1775 if (!local_got)
1776 continue;
1777
1778 symtab_hdr = &elf_tdata (ibfd)->symtab_hdr;
1779 locsymcount = symtab_hdr->sh_info;
1780 end_local_got = local_got + locsymcount;
1781 local_tls_type = elf_i386_local_got_tls_type (ibfd);
1782 s = htab->sgot;
1783 srel = htab->srelgot;
1784 for (; local_got < end_local_got; ++local_got, ++local_tls_type)
1785 {
1786 if (*local_got > 0)
1787 {
1788 *local_got = s->size;
1789 s->size += 4;
1790 if (*local_tls_type == GOT_TLS_GD
1791 || *local_tls_type == GOT_TLS_IE_BOTH)
1792 s->size += 4;
1793 if (info->shared
1794 || *local_tls_type == GOT_TLS_GD
1795 || (*local_tls_type & GOT_TLS_IE))
1796 {
1797 if (*local_tls_type == GOT_TLS_IE_BOTH)
1798 srel->size += 2 * sizeof (Elf32_External_Rel);
1799 else
1800 srel->size += sizeof (Elf32_External_Rel);
1801 }
1802 }
1803 else
1804 *local_got = (bfd_vma) -1;
1805 }
1806 }
1807
1808 if (htab->tls_ldm_got.refcount > 0)
1809 {
1810 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
1811 relocs. */
1812 htab->tls_ldm_got.offset = htab->sgot->size;
1813 htab->sgot->size += 8;
1814 htab->srelgot->size += sizeof (Elf32_External_Rel);
1815 }
1816 else
1817 htab->tls_ldm_got.offset = -1;
1818
1819 /* Allocate global sym .plt and .got entries, and space for global
1820 sym dynamic relocs. */
1821 elf_link_hash_traverse (&htab->elf, allocate_dynrelocs, (PTR) info);
1822
1823 /* We now have determined the sizes of the various dynamic sections.
1824 Allocate memory for them. */
1825 relocs = FALSE;
1826 for (s = dynobj->sections; s != NULL; s = s->next)
1827 {
1828 if ((s->flags & SEC_LINKER_CREATED) == 0)
1829 continue;
1830
1831 if (s == htab->splt
1832 || s == htab->sgot
1833 || s == htab->sgotplt)
1834 {
1835 /* Strip this section if we don't need it; see the
1836 comment below. */
1837 }
1838 else if (strncmp (bfd_get_section_name (dynobj, s), ".rel", 4) == 0)
1839 {
1840 if (s->size != 0 && s != htab->srelplt)
1841 relocs = TRUE;
1842
1843 /* We use the reloc_count field as a counter if we need
1844 to copy relocs into the output file. */
1845 s->reloc_count = 0;
1846 }
1847 else
1848 {
1849 /* It's not one of our sections, so don't allocate space. */
1850 continue;
1851 }
1852
1853 if (s->size == 0)
1854 {
1855 /* If we don't need this section, strip it from the
1856 output file. This is mostly to handle .rel.bss and
1857 .rel.plt. We must create both sections in
1858 create_dynamic_sections, because they must be created
1859 before the linker maps input sections to output
1860 sections. The linker does that before
1861 adjust_dynamic_symbol is called, and it is that
1862 function which decides whether anything needs to go
1863 into these sections. */
1864
1865 _bfd_strip_section_from_output (info, s);
1866 continue;
1867 }
1868
1869 /* Allocate memory for the section contents. We use bfd_zalloc
1870 here in case unused entries are not reclaimed before the
1871 section's contents are written out. This should not happen,
1872 but this way if it does, we get a R_386_NONE reloc instead
1873 of garbage. */
1874 s->contents = bfd_zalloc (dynobj, s->size);
1875 if (s->contents == NULL)
1876 return FALSE;
1877 }
1878
1879 if (htab->elf.dynamic_sections_created)
1880 {
1881 /* Add some entries to the .dynamic section. We fill in the
1882 values later, in elf_i386_finish_dynamic_sections, but we
1883 must add the entries now so that we get the correct size for
1884 the .dynamic section. The DT_DEBUG entry is filled in by the
1885 dynamic linker and used by the debugger. */
1886 #define add_dynamic_entry(TAG, VAL) \
1887 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
1888
1889 if (info->executable)
1890 {
1891 if (!add_dynamic_entry (DT_DEBUG, 0))
1892 return FALSE;
1893 }
1894
1895 if (htab->splt->size != 0)
1896 {
1897 if (!add_dynamic_entry (DT_PLTGOT, 0)
1898 || !add_dynamic_entry (DT_PLTRELSZ, 0)
1899 || !add_dynamic_entry (DT_PLTREL, DT_REL)
1900 || !add_dynamic_entry (DT_JMPREL, 0))
1901 return FALSE;
1902 }
1903
1904 if (relocs)
1905 {
1906 if (!add_dynamic_entry (DT_REL, 0)
1907 || !add_dynamic_entry (DT_RELSZ, 0)
1908 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
1909 return FALSE;
1910
1911 /* If any dynamic relocs apply to a read-only section,
1912 then we need a DT_TEXTREL entry. */
1913 if ((info->flags & DF_TEXTREL) == 0)
1914 elf_link_hash_traverse (&htab->elf, readonly_dynrelocs,
1915 (PTR) info);
1916
1917 if ((info->flags & DF_TEXTREL) != 0)
1918 {
1919 if (!add_dynamic_entry (DT_TEXTREL, 0))
1920 return FALSE;
1921 }
1922 }
1923 }
1924 #undef add_dynamic_entry
1925
1926 return TRUE;
1927 }
1928
1929 /* Set the correct type for an x86 ELF section. We do this by the
1930 section name, which is a hack, but ought to work. */
1931
1932 static bfd_boolean
1933 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1934 Elf_Internal_Shdr *hdr,
1935 asection *sec)
1936 {
1937 register const char *name;
1938
1939 name = bfd_get_section_name (abfd, sec);
1940
1941 /* This is an ugly, but unfortunately necessary hack that is
1942 needed when producing EFI binaries on x86. It tells
1943 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1944 containing ELF relocation info. We need this hack in order to
1945 be able to generate ELF binaries that can be translated into
1946 EFI applications (which are essentially COFF objects). Those
1947 files contain a COFF ".reloc" section inside an ELFNN object,
1948 which would normally cause BFD to segfault because it would
1949 attempt to interpret this section as containing relocation
1950 entries for section "oc". With this hack enabled, ".reloc"
1951 will be treated as a normal data section, which will avoid the
1952 segfault. However, you won't be able to create an ELFNN binary
1953 with a section named "oc" that needs relocations, but that's
1954 the kind of ugly side-effects you get when detecting section
1955 types based on their names... In practice, this limitation is
1956 unlikely to bite. */
1957 if (strcmp (name, ".reloc") == 0)
1958 hdr->sh_type = SHT_PROGBITS;
1959
1960 return TRUE;
1961 }
1962
1963 /* Return the base VMA address which should be subtracted from real addresses
1964 when resolving @dtpoff relocation.
1965 This is PT_TLS segment p_vaddr. */
1966
1967 static bfd_vma
1968 dtpoff_base (struct bfd_link_info *info)
1969 {
1970 /* If tls_sec is NULL, we should have signalled an error already. */
1971 if (elf_hash_table (info)->tls_sec == NULL)
1972 return 0;
1973 return elf_hash_table (info)->tls_sec->vma;
1974 }
1975
1976 /* Return the relocation value for @tpoff relocation
1977 if STT_TLS virtual address is ADDRESS. */
1978
1979 static bfd_vma
1980 tpoff (struct bfd_link_info *info, bfd_vma address)
1981 {
1982 struct elf_link_hash_table *htab = elf_hash_table (info);
1983
1984 /* If tls_sec is NULL, we should have signalled an error already. */
1985 if (htab->tls_sec == NULL)
1986 return 0;
1987 return htab->tls_size + htab->tls_sec->vma - address;
1988 }
1989
1990 /* Relocate an i386 ELF section. */
1991
1992 static bfd_boolean
1993 elf_i386_relocate_section (bfd *output_bfd,
1994 struct bfd_link_info *info,
1995 bfd *input_bfd,
1996 asection *input_section,
1997 bfd_byte *contents,
1998 Elf_Internal_Rela *relocs,
1999 Elf_Internal_Sym *local_syms,
2000 asection **local_sections)
2001 {
2002 struct elf_i386_link_hash_table *htab;
2003 Elf_Internal_Shdr *symtab_hdr;
2004 struct elf_link_hash_entry **sym_hashes;
2005 bfd_vma *local_got_offsets;
2006 Elf_Internal_Rela *rel;
2007 Elf_Internal_Rela *relend;
2008
2009 htab = elf_i386_hash_table (info);
2010 symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr;
2011 sym_hashes = elf_sym_hashes (input_bfd);
2012 local_got_offsets = elf_local_got_offsets (input_bfd);
2013
2014 rel = relocs;
2015 relend = relocs + input_section->reloc_count;
2016 for (; rel < relend; rel++)
2017 {
2018 unsigned int r_type;
2019 reloc_howto_type *howto;
2020 unsigned long r_symndx;
2021 struct elf_link_hash_entry *h;
2022 Elf_Internal_Sym *sym;
2023 asection *sec;
2024 bfd_vma off;
2025 bfd_vma relocation;
2026 bfd_boolean unresolved_reloc;
2027 bfd_reloc_status_type r;
2028 unsigned int indx;
2029 int tls_type;
2030
2031 r_type = ELF32_R_TYPE (rel->r_info);
2032 if (r_type == R_386_GNU_VTINHERIT
2033 || r_type == R_386_GNU_VTENTRY)
2034 continue;
2035
2036 if ((indx = r_type) >= R_386_standard
2037 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2038 >= R_386_ext - R_386_standard)
2039 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2040 >= R_386_tls - R_386_ext))
2041 {
2042 (*_bfd_error_handler)
2043 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
2044 input_bfd, input_section, r_type);
2045 bfd_set_error (bfd_error_bad_value);
2046 return FALSE;
2047 }
2048 howto = elf_howto_table + indx;
2049
2050 r_symndx = ELF32_R_SYM (rel->r_info);
2051
2052 if (info->relocatable)
2053 {
2054 bfd_vma val;
2055 bfd_byte *where;
2056
2057 /* This is a relocatable link. We don't have to change
2058 anything, unless the reloc is against a section symbol,
2059 in which case we have to adjust according to where the
2060 section symbol winds up in the output section. */
2061 if (r_symndx >= symtab_hdr->sh_info)
2062 continue;
2063
2064 sym = local_syms + r_symndx;
2065 if (ELF_ST_TYPE (sym->st_info) != STT_SECTION)
2066 continue;
2067
2068 sec = local_sections[r_symndx];
2069 val = sec->output_offset;
2070 if (val == 0)
2071 continue;
2072
2073 where = contents + rel->r_offset;
2074 switch (howto->size)
2075 {
2076 /* FIXME: overflow checks. */
2077 case 0:
2078 val += bfd_get_8 (input_bfd, where);
2079 bfd_put_8 (input_bfd, val, where);
2080 break;
2081 case 1:
2082 val += bfd_get_16 (input_bfd, where);
2083 bfd_put_16 (input_bfd, val, where);
2084 break;
2085 case 2:
2086 val += bfd_get_32 (input_bfd, where);
2087 bfd_put_32 (input_bfd, val, where);
2088 break;
2089 default:
2090 abort ();
2091 }
2092 continue;
2093 }
2094
2095 /* This is a final link. */
2096 h = NULL;
2097 sym = NULL;
2098 sec = NULL;
2099 unresolved_reloc = FALSE;
2100 if (r_symndx < symtab_hdr->sh_info)
2101 {
2102 sym = local_syms + r_symndx;
2103 sec = local_sections[r_symndx];
2104 relocation = (sec->output_section->vma
2105 + sec->output_offset
2106 + sym->st_value);
2107 if ((sec->flags & SEC_MERGE)
2108 && ELF_ST_TYPE (sym->st_info) == STT_SECTION)
2109 {
2110 asection *msec;
2111 bfd_vma addend;
2112 bfd_byte *where = contents + rel->r_offset;
2113
2114 switch (howto->size)
2115 {
2116 case 0:
2117 addend = bfd_get_8 (input_bfd, where);
2118 if (howto->pc_relative)
2119 {
2120 addend = (addend ^ 0x80) - 0x80;
2121 addend += 1;
2122 }
2123 break;
2124 case 1:
2125 addend = bfd_get_16 (input_bfd, where);
2126 if (howto->pc_relative)
2127 {
2128 addend = (addend ^ 0x8000) - 0x8000;
2129 addend += 2;
2130 }
2131 break;
2132 case 2:
2133 addend = bfd_get_32 (input_bfd, where);
2134 if (howto->pc_relative)
2135 {
2136 addend = (addend ^ 0x80000000) - 0x80000000;
2137 addend += 4;
2138 }
2139 break;
2140 default:
2141 abort ();
2142 }
2143
2144 msec = sec;
2145 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec, addend);
2146 addend -= relocation;
2147 addend += msec->output_section->vma + msec->output_offset;
2148
2149 switch (howto->size)
2150 {
2151 case 0:
2152 /* FIXME: overflow checks. */
2153 if (howto->pc_relative)
2154 addend -= 1;
2155 bfd_put_8 (input_bfd, addend, where);
2156 break;
2157 case 1:
2158 if (howto->pc_relative)
2159 addend -= 2;
2160 bfd_put_16 (input_bfd, addend, where);
2161 break;
2162 case 2:
2163 if (howto->pc_relative)
2164 addend -= 4;
2165 bfd_put_32 (input_bfd, addend, where);
2166 break;
2167 }
2168 }
2169 }
2170 else
2171 {
2172 bfd_boolean warned;
2173
2174 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2175 r_symndx, symtab_hdr, sym_hashes,
2176 h, sec, relocation,
2177 unresolved_reloc, warned);
2178 }
2179
2180 switch (r_type)
2181 {
2182 case R_386_GOT32:
2183 /* Relocation is to the entry for this symbol in the global
2184 offset table. */
2185 if (htab->sgot == NULL)
2186 abort ();
2187
2188 if (h != NULL)
2189 {
2190 bfd_boolean dyn;
2191
2192 off = h->got.offset;
2193 dyn = htab->elf.dynamic_sections_created;
2194 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, info->shared, h)
2195 || (info->shared
2196 && SYMBOL_REFERENCES_LOCAL (info, h))
2197 || (ELF_ST_VISIBILITY (h->other)
2198 && h->root.type == bfd_link_hash_undefweak))
2199 {
2200 /* This is actually a static link, or it is a
2201 -Bsymbolic link and the symbol is defined
2202 locally, or the symbol was forced to be local
2203 because of a version file. We must initialize
2204 this entry in the global offset table. Since the
2205 offset must always be a multiple of 4, we use the
2206 least significant bit to record whether we have
2207 initialized it already.
2208
2209 When doing a dynamic link, we create a .rel.got
2210 relocation entry to initialize the value. This
2211 is done in the finish_dynamic_symbol routine. */
2212 if ((off & 1) != 0)
2213 off &= ~1;
2214 else
2215 {
2216 bfd_put_32 (output_bfd, relocation,
2217 htab->sgot->contents + off);
2218 h->got.offset |= 1;
2219 }
2220 }
2221 else
2222 unresolved_reloc = FALSE;
2223 }
2224 else
2225 {
2226 if (local_got_offsets == NULL)
2227 abort ();
2228
2229 off = local_got_offsets[r_symndx];
2230
2231 /* The offset must always be a multiple of 4. We use
2232 the least significant bit to record whether we have
2233 already generated the necessary reloc. */
2234 if ((off & 1) != 0)
2235 off &= ~1;
2236 else
2237 {
2238 bfd_put_32 (output_bfd, relocation,
2239 htab->sgot->contents + off);
2240
2241 if (info->shared)
2242 {
2243 asection *s;
2244 Elf_Internal_Rela outrel;
2245 bfd_byte *loc;
2246
2247 s = htab->srelgot;
2248 if (s == NULL)
2249 abort ();
2250
2251 outrel.r_offset = (htab->sgot->output_section->vma
2252 + htab->sgot->output_offset
2253 + off);
2254 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2255 loc = s->contents;
2256 loc += s->reloc_count++ * sizeof (Elf32_External_Rel);
2257 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2258 }
2259
2260 local_got_offsets[r_symndx] |= 1;
2261 }
2262 }
2263
2264 if (off >= (bfd_vma) -2)
2265 abort ();
2266
2267 relocation = htab->sgot->output_section->vma
2268 + htab->sgot->output_offset + off
2269 - htab->sgotplt->output_section->vma
2270 - htab->sgotplt->output_offset;
2271 break;
2272
2273 case R_386_GOTOFF:
2274 /* Relocation is relative to the start of the global offset
2275 table. */
2276
2277 /* Note that sgot is not involved in this
2278 calculation. We always want the start of .got.plt. If we
2279 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2280 permitted by the ABI, we might have to change this
2281 calculation. */
2282 relocation -= htab->sgotplt->output_section->vma
2283 + htab->sgotplt->output_offset;
2284 break;
2285
2286 case R_386_GOTPC:
2287 /* Use global offset table as symbol value. */
2288 relocation = htab->sgotplt->output_section->vma
2289 + htab->sgotplt->output_offset;
2290 unresolved_reloc = FALSE;
2291 break;
2292
2293 case R_386_PLT32:
2294 /* Relocation is to the entry for this symbol in the
2295 procedure linkage table. */
2296
2297 /* Resolve a PLT32 reloc against a local symbol directly,
2298 without using the procedure linkage table. */
2299 if (h == NULL)
2300 break;
2301
2302 if (h->plt.offset == (bfd_vma) -1
2303 || htab->splt == NULL)
2304 {
2305 /* We didn't make a PLT entry for this symbol. This
2306 happens when statically linking PIC code, or when
2307 using -Bsymbolic. */
2308 break;
2309 }
2310
2311 relocation = (htab->splt->output_section->vma
2312 + htab->splt->output_offset
2313 + h->plt.offset);
2314 unresolved_reloc = FALSE;
2315 break;
2316
2317 case R_386_32:
2318 case R_386_PC32:
2319 /* r_symndx will be zero only for relocs against symbols
2320 from removed linkonce sections, or sections discarded by
2321 a linker script. */
2322 if (r_symndx == 0
2323 || (input_section->flags & SEC_ALLOC) == 0)
2324 break;
2325
2326 if ((info->shared
2327 && (h == NULL
2328 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2329 || h->root.type != bfd_link_hash_undefweak)
2330 && (r_type != R_386_PC32
2331 || !SYMBOL_CALLS_LOCAL (info, h)))
2332 || (ELIMINATE_COPY_RELOCS
2333 && !info->shared
2334 && h != NULL
2335 && h->dynindx != -1
2336 && (h->elf_link_hash_flags & ELF_LINK_NON_GOT_REF) == 0
2337 && (((h->elf_link_hash_flags
2338 & ELF_LINK_HASH_DEF_DYNAMIC) != 0
2339 && (h->elf_link_hash_flags
2340 & ELF_LINK_HASH_DEF_REGULAR) == 0)
2341 || h->root.type == bfd_link_hash_undefweak
2342 || h->root.type == bfd_link_hash_undefined)))
2343 {
2344 Elf_Internal_Rela outrel;
2345 bfd_byte *loc;
2346 bfd_boolean skip, relocate;
2347 asection *sreloc;
2348
2349 /* When generating a shared object, these relocations
2350 are copied into the output file to be resolved at run
2351 time. */
2352
2353 skip = FALSE;
2354 relocate = FALSE;
2355
2356 outrel.r_offset =
2357 _bfd_elf_section_offset (output_bfd, info, input_section,
2358 rel->r_offset);
2359 if (outrel.r_offset == (bfd_vma) -1)
2360 skip = TRUE;
2361 else if (outrel.r_offset == (bfd_vma) -2)
2362 skip = TRUE, relocate = TRUE;
2363 outrel.r_offset += (input_section->output_section->vma
2364 + input_section->output_offset);
2365
2366 if (skip)
2367 memset (&outrel, 0, sizeof outrel);
2368 else if (h != NULL
2369 && h->dynindx != -1
2370 && (r_type == R_386_PC32
2371 || !info->shared
2372 || !info->symbolic
2373 || (h->elf_link_hash_flags
2374 & ELF_LINK_HASH_DEF_REGULAR) == 0))
2375 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2376 else
2377 {
2378 /* This symbol is local, or marked to become local. */
2379 relocate = TRUE;
2380 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2381 }
2382
2383 sreloc = elf_section_data (input_section)->sreloc;
2384 if (sreloc == NULL)
2385 abort ();
2386
2387 loc = sreloc->contents;
2388 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2389 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2390
2391 /* If this reloc is against an external symbol, we do
2392 not want to fiddle with the addend. Otherwise, we
2393 need to include the symbol value so that it becomes
2394 an addend for the dynamic reloc. */
2395 if (! relocate)
2396 continue;
2397 }
2398 break;
2399
2400 case R_386_TLS_IE:
2401 if (info->shared)
2402 {
2403 Elf_Internal_Rela outrel;
2404 bfd_byte *loc;
2405 asection *sreloc;
2406
2407 outrel.r_offset = rel->r_offset
2408 + input_section->output_section->vma
2409 + input_section->output_offset;
2410 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2411 sreloc = elf_section_data (input_section)->sreloc;
2412 if (sreloc == NULL)
2413 abort ();
2414 loc = sreloc->contents;
2415 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2416 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2417 }
2418 /* Fall through */
2419
2420 case R_386_TLS_GD:
2421 case R_386_TLS_IE_32:
2422 case R_386_TLS_GOTIE:
2423 r_type = elf_i386_tls_transition (info, r_type, h == NULL);
2424 tls_type = GOT_UNKNOWN;
2425 if (h == NULL && local_got_offsets)
2426 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
2427 else if (h != NULL)
2428 {
2429 tls_type = elf_i386_hash_entry(h)->tls_type;
2430 if (!info->shared && h->dynindx == -1 && (tls_type & GOT_TLS_IE))
2431 r_type = R_386_TLS_LE_32;
2432 }
2433 if (tls_type == GOT_TLS_IE)
2434 tls_type = GOT_TLS_IE_NEG;
2435 if (r_type == R_386_TLS_GD)
2436 {
2437 if (tls_type == GOT_TLS_IE_POS)
2438 r_type = R_386_TLS_GOTIE;
2439 else if (tls_type & GOT_TLS_IE)
2440 r_type = R_386_TLS_IE_32;
2441 }
2442
2443 if (r_type == R_386_TLS_LE_32)
2444 {
2445 BFD_ASSERT (! unresolved_reloc);
2446 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
2447 {
2448 unsigned int val, type;
2449 bfd_vma roff;
2450
2451 /* GD->LE transition. */
2452 BFD_ASSERT (rel->r_offset >= 2);
2453 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2454 BFD_ASSERT (type == 0x8d || type == 0x04);
2455 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2456 BFD_ASSERT (bfd_get_8 (input_bfd,
2457 contents + rel->r_offset + 4)
2458 == 0xe8);
2459 BFD_ASSERT (rel + 1 < relend);
2460 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2461 roff = rel->r_offset + 5;
2462 val = bfd_get_8 (input_bfd,
2463 contents + rel->r_offset - 1);
2464 if (type == 0x04)
2465 {
2466 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2467 Change it into:
2468 movl %gs:0, %eax; subl $foo@tpoff, %eax
2469 (6 byte form of subl). */
2470 BFD_ASSERT (rel->r_offset >= 3);
2471 BFD_ASSERT (bfd_get_8 (input_bfd,
2472 contents + rel->r_offset - 3)
2473 == 0x8d);
2474 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2475 memcpy (contents + rel->r_offset - 3,
2476 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2477 }
2478 else
2479 {
2480 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2481 if (rel->r_offset + 10 <= input_section->size
2482 && bfd_get_8 (input_bfd,
2483 contents + rel->r_offset + 9) == 0x90)
2484 {
2485 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2486 Change it into:
2487 movl %gs:0, %eax; subl $foo@tpoff, %eax
2488 (6 byte form of subl). */
2489 memcpy (contents + rel->r_offset - 2,
2490 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2491 roff = rel->r_offset + 6;
2492 }
2493 else
2494 {
2495 /* leal foo(%reg), %eax; call ___tls_get_addr
2496 Change it into:
2497 movl %gs:0, %eax; subl $foo@tpoff, %eax
2498 (5 byte form of subl). */
2499 memcpy (contents + rel->r_offset - 2,
2500 "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2501 }
2502 }
2503 bfd_put_32 (output_bfd, tpoff (info, relocation),
2504 contents + roff);
2505 /* Skip R_386_PLT32. */
2506 rel++;
2507 continue;
2508 }
2509 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
2510 {
2511 unsigned int val, type;
2512
2513 /* IE->LE transition:
2514 Originally it can be one of:
2515 movl foo, %eax
2516 movl foo, %reg
2517 addl foo, %reg
2518 We change it into:
2519 movl $foo, %eax
2520 movl $foo, %reg
2521 addl $foo, %reg. */
2522 BFD_ASSERT (rel->r_offset >= 1);
2523 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2524 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2525 if (val == 0xa1)
2526 {
2527 /* movl foo, %eax. */
2528 bfd_put_8 (output_bfd, 0xb8,
2529 contents + rel->r_offset - 1);
2530 }
2531 else
2532 {
2533 BFD_ASSERT (rel->r_offset >= 2);
2534 type = bfd_get_8 (input_bfd,
2535 contents + rel->r_offset - 2);
2536 switch (type)
2537 {
2538 case 0x8b:
2539 /* movl */
2540 BFD_ASSERT ((val & 0xc7) == 0x05);
2541 bfd_put_8 (output_bfd, 0xc7,
2542 contents + rel->r_offset - 2);
2543 bfd_put_8 (output_bfd,
2544 0xc0 | ((val >> 3) & 7),
2545 contents + rel->r_offset - 1);
2546 break;
2547 case 0x03:
2548 /* addl */
2549 BFD_ASSERT ((val & 0xc7) == 0x05);
2550 bfd_put_8 (output_bfd, 0x81,
2551 contents + rel->r_offset - 2);
2552 bfd_put_8 (output_bfd,
2553 0xc0 | ((val >> 3) & 7),
2554 contents + rel->r_offset - 1);
2555 break;
2556 default:
2557 BFD_FAIL ();
2558 break;
2559 }
2560 }
2561 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2562 contents + rel->r_offset);
2563 continue;
2564 }
2565 else
2566 {
2567 unsigned int val, type;
2568
2569 /* {IE_32,GOTIE}->LE transition:
2570 Originally it can be one of:
2571 subl foo(%reg1), %reg2
2572 movl foo(%reg1), %reg2
2573 addl foo(%reg1), %reg2
2574 We change it into:
2575 subl $foo, %reg2
2576 movl $foo, %reg2 (6 byte form)
2577 addl $foo, %reg2. */
2578 BFD_ASSERT (rel->r_offset >= 2);
2579 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2580 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2581 BFD_ASSERT (rel->r_offset + 4 <= input_section->size);
2582 BFD_ASSERT ((val & 0xc0) == 0x80 && (val & 7) != 4);
2583 if (type == 0x8b)
2584 {
2585 /* movl */
2586 bfd_put_8 (output_bfd, 0xc7,
2587 contents + rel->r_offset - 2);
2588 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2589 contents + rel->r_offset - 1);
2590 }
2591 else if (type == 0x2b)
2592 {
2593 /* subl */
2594 bfd_put_8 (output_bfd, 0x81,
2595 contents + rel->r_offset - 2);
2596 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2597 contents + rel->r_offset - 1);
2598 }
2599 else if (type == 0x03)
2600 {
2601 /* addl */
2602 bfd_put_8 (output_bfd, 0x81,
2603 contents + rel->r_offset - 2);
2604 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2605 contents + rel->r_offset - 1);
2606 }
2607 else
2608 BFD_FAIL ();
2609 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
2610 bfd_put_32 (output_bfd, -tpoff (info, relocation),
2611 contents + rel->r_offset);
2612 else
2613 bfd_put_32 (output_bfd, tpoff (info, relocation),
2614 contents + rel->r_offset);
2615 continue;
2616 }
2617 }
2618
2619 if (htab->sgot == NULL)
2620 abort ();
2621
2622 if (h != NULL)
2623 off = h->got.offset;
2624 else
2625 {
2626 if (local_got_offsets == NULL)
2627 abort ();
2628
2629 off = local_got_offsets[r_symndx];
2630 }
2631
2632 if ((off & 1) != 0)
2633 off &= ~1;
2634 else
2635 {
2636 Elf_Internal_Rela outrel;
2637 bfd_byte *loc;
2638 int dr_type, indx;
2639
2640 if (htab->srelgot == NULL)
2641 abort ();
2642
2643 outrel.r_offset = (htab->sgot->output_section->vma
2644 + htab->sgot->output_offset + off);
2645
2646 indx = h && h->dynindx != -1 ? h->dynindx : 0;
2647 if (r_type == R_386_TLS_GD)
2648 dr_type = R_386_TLS_DTPMOD32;
2649 else if (tls_type == GOT_TLS_IE_POS)
2650 dr_type = R_386_TLS_TPOFF;
2651 else
2652 dr_type = R_386_TLS_TPOFF32;
2653 if (dr_type == R_386_TLS_TPOFF && indx == 0)
2654 bfd_put_32 (output_bfd, relocation - dtpoff_base (info),
2655 htab->sgot->contents + off);
2656 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
2657 bfd_put_32 (output_bfd, dtpoff_base (info) - relocation,
2658 htab->sgot->contents + off);
2659 else
2660 bfd_put_32 (output_bfd, 0,
2661 htab->sgot->contents + off);
2662 outrel.r_info = ELF32_R_INFO (indx, dr_type);
2663 loc = htab->srelgot->contents;
2664 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2665 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2666
2667 if (r_type == R_386_TLS_GD)
2668 {
2669 if (indx == 0)
2670 {
2671 BFD_ASSERT (! unresolved_reloc);
2672 bfd_put_32 (output_bfd,
2673 relocation - dtpoff_base (info),
2674 htab->sgot->contents + off + 4);
2675 }
2676 else
2677 {
2678 bfd_put_32 (output_bfd, 0,
2679 htab->sgot->contents + off + 4);
2680 outrel.r_info = ELF32_R_INFO (indx,
2681 R_386_TLS_DTPOFF32);
2682 outrel.r_offset += 4;
2683 htab->srelgot->reloc_count++;
2684 loc += sizeof (Elf32_External_Rel);
2685 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2686 }
2687 }
2688 else if (tls_type == GOT_TLS_IE_BOTH)
2689 {
2690 bfd_put_32 (output_bfd,
2691 indx == 0 ? relocation - dtpoff_base (info) : 0,
2692 htab->sgot->contents + off + 4);
2693 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2694 outrel.r_offset += 4;
2695 htab->srelgot->reloc_count++;
2696 loc += sizeof (Elf32_External_Rel);
2697 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2698 }
2699
2700 if (h != NULL)
2701 h->got.offset |= 1;
2702 else
2703 local_got_offsets[r_symndx] |= 1;
2704 }
2705
2706 if (off >= (bfd_vma) -2)
2707 abort ();
2708 if (r_type == ELF32_R_TYPE (rel->r_info))
2709 {
2710 bfd_vma g_o_t = htab->sgotplt->output_section->vma
2711 + htab->sgotplt->output_offset;
2712 relocation = htab->sgot->output_section->vma
2713 + htab->sgot->output_offset + off - g_o_t;
2714 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
2715 && tls_type == GOT_TLS_IE_BOTH)
2716 relocation += 4;
2717 if (r_type == R_386_TLS_IE)
2718 relocation += g_o_t;
2719 unresolved_reloc = FALSE;
2720 }
2721 else
2722 {
2723 unsigned int val, type;
2724 bfd_vma roff;
2725
2726 /* GD->IE transition. */
2727 BFD_ASSERT (rel->r_offset >= 2);
2728 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2729 BFD_ASSERT (type == 0x8d || type == 0x04);
2730 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2731 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2732 == 0xe8);
2733 BFD_ASSERT (rel + 1 < relend);
2734 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2735 roff = rel->r_offset - 3;
2736 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2737 if (type == 0x04)
2738 {
2739 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
2740 Change it into:
2741 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2742 BFD_ASSERT (rel->r_offset >= 3);
2743 BFD_ASSERT (bfd_get_8 (input_bfd,
2744 contents + rel->r_offset - 3)
2745 == 0x8d);
2746 BFD_ASSERT ((val & 0xc7) == 0x05 && val != (4 << 3));
2747 val >>= 3;
2748 }
2749 else
2750 {
2751 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
2752 Change it into:
2753 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
2754 BFD_ASSERT (rel->r_offset + 10 <= input_section->size);
2755 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2756 BFD_ASSERT (bfd_get_8 (input_bfd,
2757 contents + rel->r_offset + 9)
2758 == 0x90);
2759 roff = rel->r_offset - 2;
2760 }
2761 memcpy (contents + roff,
2762 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
2763 contents[roff + 7] = 0x80 | (val & 7);
2764 /* If foo is used only with foo@gotntpoff(%reg) and
2765 foo@indntpoff, but not with foo@gottpoff(%reg), change
2766 subl $foo@gottpoff(%reg), %eax
2767 into:
2768 addl $foo@gotntpoff(%reg), %eax. */
2769 if (r_type == R_386_TLS_GOTIE)
2770 {
2771 contents[roff + 6] = 0x03;
2772 if (tls_type == GOT_TLS_IE_BOTH)
2773 off += 4;
2774 }
2775 bfd_put_32 (output_bfd,
2776 htab->sgot->output_section->vma
2777 + htab->sgot->output_offset + off
2778 - htab->sgotplt->output_section->vma
2779 - htab->sgotplt->output_offset,
2780 contents + roff + 8);
2781 /* Skip R_386_PLT32. */
2782 rel++;
2783 continue;
2784 }
2785 break;
2786
2787 case R_386_TLS_LDM:
2788 if (! info->shared)
2789 {
2790 unsigned int val;
2791
2792 /* LD->LE transition:
2793 Ensure it is:
2794 leal foo(%reg), %eax; call ___tls_get_addr.
2795 We change it into:
2796 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
2797 BFD_ASSERT (rel->r_offset >= 2);
2798 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset - 2)
2799 == 0x8d);
2800 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2801 BFD_ASSERT ((val & 0xf8) == 0x80 && (val & 7) != 4);
2802 BFD_ASSERT (rel->r_offset + 9 <= input_section->size);
2803 BFD_ASSERT (bfd_get_8 (input_bfd, contents + rel->r_offset + 4)
2804 == 0xe8);
2805 BFD_ASSERT (rel + 1 < relend);
2806 BFD_ASSERT (ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
2807 memcpy (contents + rel->r_offset - 2,
2808 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
2809 /* Skip R_386_PLT32. */
2810 rel++;
2811 continue;
2812 }
2813
2814 if (htab->sgot == NULL)
2815 abort ();
2816
2817 off = htab->tls_ldm_got.offset;
2818 if (off & 1)
2819 off &= ~1;
2820 else
2821 {
2822 Elf_Internal_Rela outrel;
2823 bfd_byte *loc;
2824
2825 if (htab->srelgot == NULL)
2826 abort ();
2827
2828 outrel.r_offset = (htab->sgot->output_section->vma
2829 + htab->sgot->output_offset + off);
2830
2831 bfd_put_32 (output_bfd, 0,
2832 htab->sgot->contents + off);
2833 bfd_put_32 (output_bfd, 0,
2834 htab->sgot->contents + off + 4);
2835 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
2836 loc = htab->srelgot->contents;
2837 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
2838 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2839 htab->tls_ldm_got.offset |= 1;
2840 }
2841 relocation = htab->sgot->output_section->vma
2842 + htab->sgot->output_offset + off
2843 - htab->sgotplt->output_section->vma
2844 - htab->sgotplt->output_offset;
2845 unresolved_reloc = FALSE;
2846 break;
2847
2848 case R_386_TLS_LDO_32:
2849 if (info->shared || (input_section->flags & SEC_CODE) == 0)
2850 relocation -= dtpoff_base (info);
2851 else
2852 /* When converting LDO to LE, we must negate. */
2853 relocation = -tpoff (info, relocation);
2854 break;
2855
2856 case R_386_TLS_LE_32:
2857 case R_386_TLS_LE:
2858 if (info->shared)
2859 {
2860 Elf_Internal_Rela outrel;
2861 asection *sreloc;
2862 bfd_byte *loc;
2863 int indx;
2864
2865 outrel.r_offset = rel->r_offset
2866 + input_section->output_section->vma
2867 + input_section->output_offset;
2868 if (h != NULL && h->dynindx != -1)
2869 indx = h->dynindx;
2870 else
2871 indx = 0;
2872 if (r_type == R_386_TLS_LE_32)
2873 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
2874 else
2875 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
2876 sreloc = elf_section_data (input_section)->sreloc;
2877 if (sreloc == NULL)
2878 abort ();
2879 loc = sreloc->contents;
2880 loc += sreloc->reloc_count++ * sizeof (Elf32_External_Rel);
2881 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
2882 if (indx)
2883 continue;
2884 else if (r_type == R_386_TLS_LE_32)
2885 relocation = dtpoff_base (info) - relocation;
2886 else
2887 relocation -= dtpoff_base (info);
2888 }
2889 else if (r_type == R_386_TLS_LE_32)
2890 relocation = tpoff (info, relocation);
2891 else
2892 relocation = -tpoff (info, relocation);
2893 break;
2894
2895 default:
2896 break;
2897 }
2898
2899 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
2900 because such sections are not SEC_ALLOC and thus ld.so will
2901 not process them. */
2902 if (unresolved_reloc
2903 && !((input_section->flags & SEC_DEBUGGING) != 0
2904 && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0))
2905 {
2906 (*_bfd_error_handler)
2907 (_("%B(%A+0x%lx): unresolvable relocation against symbol `%s'"),
2908 input_bfd,
2909 input_section,
2910 (long) rel->r_offset,
2911 h->root.root.string);
2912 return FALSE;
2913 }
2914
2915 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
2916 contents, rel->r_offset,
2917 relocation, 0);
2918
2919 if (r != bfd_reloc_ok)
2920 {
2921 const char *name;
2922
2923 if (h != NULL)
2924 name = h->root.root.string;
2925 else
2926 {
2927 name = bfd_elf_string_from_elf_section (input_bfd,
2928 symtab_hdr->sh_link,
2929 sym->st_name);
2930 if (name == NULL)
2931 return FALSE;
2932 if (*name == '\0')
2933 name = bfd_section_name (input_bfd, sec);
2934 }
2935
2936 if (r == bfd_reloc_overflow)
2937 {
2938 if (! ((*info->callbacks->reloc_overflow)
2939 (info, name, howto->name, 0,
2940 input_bfd, input_section, rel->r_offset)))
2941 return FALSE;
2942 }
2943 else
2944 {
2945 (*_bfd_error_handler)
2946 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
2947 input_bfd, input_section,
2948 (long) rel->r_offset, name, (int) r);
2949 return FALSE;
2950 }
2951 }
2952 }
2953
2954 return TRUE;
2955 }
2956
2957 /* Finish up dynamic symbol handling. We set the contents of various
2958 dynamic sections here. */
2959
2960 static bfd_boolean
2961 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
2962 struct bfd_link_info *info,
2963 struct elf_link_hash_entry *h,
2964 Elf_Internal_Sym *sym)
2965 {
2966 struct elf_i386_link_hash_table *htab;
2967
2968 htab = elf_i386_hash_table (info);
2969
2970 if (h->plt.offset != (bfd_vma) -1)
2971 {
2972 bfd_vma plt_index;
2973 bfd_vma got_offset;
2974 Elf_Internal_Rela rel;
2975 bfd_byte *loc;
2976
2977 /* This symbol has an entry in the procedure linkage table. Set
2978 it up. */
2979
2980 if (h->dynindx == -1
2981 || htab->splt == NULL
2982 || htab->sgotplt == NULL
2983 || htab->srelplt == NULL)
2984 abort ();
2985
2986 /* Get the index in the procedure linkage table which
2987 corresponds to this symbol. This is the index of this symbol
2988 in all the symbols for which we are making plt entries. The
2989 first entry in the procedure linkage table is reserved. */
2990 plt_index = h->plt.offset / PLT_ENTRY_SIZE - 1;
2991
2992 /* Get the offset into the .got table of the entry that
2993 corresponds to this function. Each .got entry is 4 bytes.
2994 The first three are reserved. */
2995 got_offset = (plt_index + 3) * 4;
2996
2997 /* Fill in the entry in the procedure linkage table. */
2998 if (! info->shared)
2999 {
3000 memcpy (htab->splt->contents + h->plt.offset, elf_i386_plt_entry,
3001 PLT_ENTRY_SIZE);
3002 bfd_put_32 (output_bfd,
3003 (htab->sgotplt->output_section->vma
3004 + htab->sgotplt->output_offset
3005 + got_offset),
3006 htab->splt->contents + h->plt.offset + 2);
3007 }
3008 else
3009 {
3010 memcpy (htab->splt->contents + h->plt.offset, elf_i386_pic_plt_entry,
3011 PLT_ENTRY_SIZE);
3012 bfd_put_32 (output_bfd, got_offset,
3013 htab->splt->contents + h->plt.offset + 2);
3014 }
3015
3016 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
3017 htab->splt->contents + h->plt.offset + 7);
3018 bfd_put_32 (output_bfd, - (h->plt.offset + PLT_ENTRY_SIZE),
3019 htab->splt->contents + h->plt.offset + 12);
3020
3021 /* Fill in the entry in the global offset table. */
3022 bfd_put_32 (output_bfd,
3023 (htab->splt->output_section->vma
3024 + htab->splt->output_offset
3025 + h->plt.offset
3026 + 6),
3027 htab->sgotplt->contents + got_offset);
3028
3029 /* Fill in the entry in the .rel.plt section. */
3030 rel.r_offset = (htab->sgotplt->output_section->vma
3031 + htab->sgotplt->output_offset
3032 + got_offset);
3033 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3034 loc = htab->srelplt->contents + plt_index * sizeof (Elf32_External_Rel);
3035 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3036
3037 if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)
3038 {
3039 /* Mark the symbol as undefined, rather than as defined in
3040 the .plt section. Leave the value if there were any
3041 relocations where pointer equality matters (this is a clue
3042 for the dynamic linker, to make function pointer
3043 comparisons work between an application and shared
3044 library), otherwise set it to zero. If a function is only
3045 called from a binary, there is no need to slow down
3046 shared libraries because of that. */
3047 sym->st_shndx = SHN_UNDEF;
3048 if ((h->elf_link_hash_flags & ELF_LINK_POINTER_EQUALITY_NEEDED) == 0)
3049 sym->st_value = 0;
3050 }
3051 }
3052
3053 if (h->got.offset != (bfd_vma) -1
3054 && elf_i386_hash_entry(h)->tls_type != GOT_TLS_GD
3055 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
3056 {
3057 Elf_Internal_Rela rel;
3058 bfd_byte *loc;
3059
3060 /* This symbol has an entry in the global offset table. Set it
3061 up. */
3062
3063 if (htab->sgot == NULL || htab->srelgot == NULL)
3064 abort ();
3065
3066 rel.r_offset = (htab->sgot->output_section->vma
3067 + htab->sgot->output_offset
3068 + (h->got.offset & ~(bfd_vma) 1));
3069
3070 /* If this is a static link, or it is a -Bsymbolic link and the
3071 symbol is defined locally or was forced to be local because
3072 of a version file, we just want to emit a RELATIVE reloc.
3073 The entry in the global offset table will already have been
3074 initialized in the relocate_section function. */
3075 if (info->shared
3076 && SYMBOL_REFERENCES_LOCAL (info, h))
3077 {
3078 BFD_ASSERT((h->got.offset & 1) != 0);
3079 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3080 }
3081 else
3082 {
3083 BFD_ASSERT((h->got.offset & 1) == 0);
3084 bfd_put_32 (output_bfd, (bfd_vma) 0,
3085 htab->sgot->contents + h->got.offset);
3086 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3087 }
3088
3089 loc = htab->srelgot->contents;
3090 loc += htab->srelgot->reloc_count++ * sizeof (Elf32_External_Rel);
3091 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3092 }
3093
3094 if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_COPY) != 0)
3095 {
3096 Elf_Internal_Rela rel;
3097 bfd_byte *loc;
3098
3099 /* This symbol needs a copy reloc. Set it up. */
3100
3101 if (h->dynindx == -1
3102 || (h->root.type != bfd_link_hash_defined
3103 && h->root.type != bfd_link_hash_defweak)
3104 || htab->srelbss == NULL)
3105 abort ();
3106
3107 rel.r_offset = (h->root.u.def.value
3108 + h->root.u.def.section->output_section->vma
3109 + h->root.u.def.section->output_offset);
3110 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3111 loc = htab->srelbss->contents;
3112 loc += htab->srelbss->reloc_count++ * sizeof (Elf32_External_Rel);
3113 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3114 }
3115
3116 /* Mark _DYNAMIC and _GLOBAL_OFFSET_TABLE_ as absolute. */
3117 if (strcmp (h->root.root.string, "_DYNAMIC") == 0
3118 || strcmp (h->root.root.string, "_GLOBAL_OFFSET_TABLE_") == 0)
3119 sym->st_shndx = SHN_ABS;
3120
3121 return TRUE;
3122 }
3123
3124 /* Used to decide how to sort relocs in an optimal manner for the
3125 dynamic linker, before writing them out. */
3126
3127 static enum elf_reloc_type_class
3128 elf_i386_reloc_type_class (const Elf_Internal_Rela *rela)
3129 {
3130 switch (ELF32_R_TYPE (rela->r_info))
3131 {
3132 case R_386_RELATIVE:
3133 return reloc_class_relative;
3134 case R_386_JUMP_SLOT:
3135 return reloc_class_plt;
3136 case R_386_COPY:
3137 return reloc_class_copy;
3138 default:
3139 return reloc_class_normal;
3140 }
3141 }
3142
3143 /* Finish up the dynamic sections. */
3144
3145 static bfd_boolean
3146 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3147 struct bfd_link_info *info)
3148 {
3149 struct elf_i386_link_hash_table *htab;
3150 bfd *dynobj;
3151 asection *sdyn;
3152
3153 htab = elf_i386_hash_table (info);
3154 dynobj = htab->elf.dynobj;
3155 sdyn = bfd_get_section_by_name (dynobj, ".dynamic");
3156
3157 if (htab->elf.dynamic_sections_created)
3158 {
3159 Elf32_External_Dyn *dyncon, *dynconend;
3160
3161 if (sdyn == NULL || htab->sgot == NULL)
3162 abort ();
3163
3164 dyncon = (Elf32_External_Dyn *) sdyn->contents;
3165 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
3166 for (; dyncon < dynconend; dyncon++)
3167 {
3168 Elf_Internal_Dyn dyn;
3169 asection *s;
3170
3171 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
3172
3173 switch (dyn.d_tag)
3174 {
3175 default:
3176 continue;
3177
3178 case DT_PLTGOT:
3179 s = htab->sgotplt;
3180 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3181 break;
3182
3183 case DT_JMPREL:
3184 s = htab->srelplt;
3185 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
3186 break;
3187
3188 case DT_PLTRELSZ:
3189 s = htab->srelplt;
3190 dyn.d_un.d_val = s->size;
3191 break;
3192
3193 case DT_RELSZ:
3194 /* My reading of the SVR4 ABI indicates that the
3195 procedure linkage table relocs (DT_JMPREL) should be
3196 included in the overall relocs (DT_REL). This is
3197 what Solaris does. However, UnixWare can not handle
3198 that case. Therefore, we override the DT_RELSZ entry
3199 here to make it not include the JMPREL relocs. */
3200 s = htab->srelplt;
3201 if (s == NULL)
3202 continue;
3203 dyn.d_un.d_val -= s->size;
3204 break;
3205
3206 case DT_REL:
3207 /* We may not be using the standard ELF linker script.
3208 If .rel.plt is the first .rel section, we adjust
3209 DT_REL to not include it. */
3210 s = htab->srelplt;
3211 if (s == NULL)
3212 continue;
3213 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
3214 continue;
3215 dyn.d_un.d_ptr += s->size;
3216 break;
3217 }
3218
3219 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
3220 }
3221
3222 /* Fill in the first entry in the procedure linkage table. */
3223 if (htab->splt && htab->splt->size > 0)
3224 {
3225 if (info->shared)
3226 memcpy (htab->splt->contents,
3227 elf_i386_pic_plt0_entry, PLT_ENTRY_SIZE);
3228 else
3229 {
3230 memcpy (htab->splt->contents,
3231 elf_i386_plt0_entry, PLT_ENTRY_SIZE);
3232 bfd_put_32 (output_bfd,
3233 (htab->sgotplt->output_section->vma
3234 + htab->sgotplt->output_offset
3235 + 4),
3236 htab->splt->contents + 2);
3237 bfd_put_32 (output_bfd,
3238 (htab->sgotplt->output_section->vma
3239 + htab->sgotplt->output_offset
3240 + 8),
3241 htab->splt->contents + 8);
3242 }
3243
3244 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3245 really seem like the right value. */
3246 elf_section_data (htab->splt->output_section)
3247 ->this_hdr.sh_entsize = 4;
3248 }
3249 }
3250
3251 if (htab->sgotplt)
3252 {
3253 /* Fill in the first three entries in the global offset table. */
3254 if (htab->sgotplt->size > 0)
3255 {
3256 bfd_put_32 (output_bfd,
3257 (sdyn == NULL ? 0
3258 : sdyn->output_section->vma + sdyn->output_offset),
3259 htab->sgotplt->contents);
3260 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 4);
3261 bfd_put_32 (output_bfd, 0, htab->sgotplt->contents + 8);
3262 }
3263
3264 elf_section_data (htab->sgotplt->output_section)->this_hdr.sh_entsize = 4;
3265 }
3266
3267 if (htab->sgot && htab->sgot->size > 0)
3268 elf_section_data (htab->sgot->output_section)->this_hdr.sh_entsize = 4;
3269
3270 return TRUE;
3271 }
3272
3273 /* Return address for Ith PLT stub in section PLT, for relocation REL
3274 or (bfd_vma) -1 if it should not be included. */
3275
3276 static bfd_vma
3277 elf_i386_plt_sym_val (bfd_vma i, const asection *plt,
3278 const arelent *rel ATTRIBUTE_UNUSED)
3279 {
3280 return plt->vma + (i + 1) * PLT_ENTRY_SIZE;
3281 }
3282
3283
3284 #define TARGET_LITTLE_SYM bfd_elf32_i386_vec
3285 #define TARGET_LITTLE_NAME "elf32-i386"
3286 #define ELF_ARCH bfd_arch_i386
3287 #define ELF_MACHINE_CODE EM_386
3288 #define ELF_MAXPAGESIZE 0x1000
3289
3290 #define elf_backend_can_gc_sections 1
3291 #define elf_backend_can_refcount 1
3292 #define elf_backend_want_got_plt 1
3293 #define elf_backend_plt_readonly 1
3294 #define elf_backend_want_plt_sym 0
3295 #define elf_backend_got_header_size 12
3296
3297 /* Support RELA for objdump of prelink objects. */
3298 #define elf_info_to_howto elf_i386_info_to_howto_rel
3299 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
3300
3301 #define bfd_elf32_mkobject elf_i386_mkobject
3302
3303 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
3304 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
3305 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
3306
3307 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
3308 #define elf_backend_check_relocs elf_i386_check_relocs
3309 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
3310 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
3311 #define elf_backend_fake_sections elf_i386_fake_sections
3312 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
3313 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
3314 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
3315 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
3316 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
3317 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
3318 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
3319 #define elf_backend_relocate_section elf_i386_relocate_section
3320 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
3321 #define elf_backend_plt_sym_val elf_i386_plt_sym_val
3322
3323 #include "elf32-target.h"
3324
3325 /* FreeBSD support. */
3326
3327 #undef TARGET_LITTLE_SYM
3328 #define TARGET_LITTLE_SYM bfd_elf32_i386_freebsd_vec
3329 #undef TARGET_LITTLE_NAME
3330 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
3331
3332 /* The kernel recognizes executables as valid only if they carry a
3333 "FreeBSD" label in the ELF header. So we put this label on all
3334 executables and (for simplicity) also all other object files. */
3335
3336 static void
3337 elf_i386_post_process_headers (bfd *abfd,
3338 struct bfd_link_info *info ATTRIBUTE_UNUSED)
3339 {
3340 Elf_Internal_Ehdr *i_ehdrp;
3341
3342 i_ehdrp = elf_elfheader (abfd);
3343
3344 /* Put an ABI label supported by FreeBSD >= 4.1. */
3345 i_ehdrp->e_ident[EI_OSABI] = ELFOSABI_FREEBSD;
3346 #ifdef OLD_FREEBSD_ABI_LABEL
3347 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
3348 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
3349 #endif
3350 }
3351
3352 #undef elf_backend_post_process_headers
3353 #define elf_backend_post_process_headers elf_i386_post_process_headers
3354 #undef elf32_bed
3355 #define elf32_bed elf32_i386_fbsd_bed
3356
3357 #include "elf32-target.h"
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