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Add "-z call-nop=PADDING" option to ld
[thirdparty/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "opcode/i386.h"
33
34 /* 386 uses REL relocations instead of RELA. */
35 #define USE_REL 1
36
37 #include "elf/i386.h"
38
39 static reloc_howto_type elf_howto_table[]=
40 {
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
74
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
81
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
113
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
153
154 /* Another gap. */
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
157
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
160 0, /* rightshift */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
162 0, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
169 0, /* src_mask */
170 0, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 0, /* bitsize */
178 FALSE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0, /* dst_mask */
186 FALSE) /* pcrel_offset */
187
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
189
190 };
191
192 #ifdef DEBUG_GEN_RELOC
193 #define TRACE(str) \
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 #else
196 #define TRACE(str)
197 #endif
198
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
202 {
203 switch (code)
204 {
205 case BFD_RELOC_NONE:
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
208
209 case BFD_RELOC_32:
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_CTOR:
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
216
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
220
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
224
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
228
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
232
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
236
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
240
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
244
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
248
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
252
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
273
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
277
278 case BFD_RELOC_16:
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
281
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
285
286 case BFD_RELOC_8:
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
289
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
293
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
318
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
330
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
334
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
338
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
342
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
346
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
350
351 default:
352 break;
353 }
354
355 TRACE ("Unknown");
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
369
370 return NULL;
371 }
372
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
375 {
376 unsigned int indx;
377
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
385 {
386 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
387 abfd, (int) r_type);
388 indx = R_386_NONE;
389 }
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table [indx].type != r_type)
392 return NULL;
393 return &elf_howto_table[indx];
394 }
395
396 static void
397 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
398 arelent *cache_ptr,
399 Elf_Internal_Rela *dst)
400 {
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
403 }
404
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
410
411 static bfd_boolean
412 elf_i386_is_local_label_name (bfd *abfd, const char *name)
413 {
414 if (name[0] == '.' && name[1] == 'X')
415 return TRUE;
416
417 return _bfd_elf_is_local_label_name (abfd, name);
418 }
419 \f
420 /* Support for core dump NOTE sections. */
421
422 static bfd_boolean
423 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
424 {
425 int offset;
426 size_t size;
427
428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
429 {
430 int pr_version = bfd_get_32 (abfd, note->descdata);
431
432 if (pr_version != 1)
433 return FALSE;
434
435 /* pr_cursig */
436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
437
438 /* pr_pid */
439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
440
441 /* pr_reg */
442 offset = 28;
443 size = bfd_get_32 (abfd, note->descdata + 8);
444 }
445 else
446 {
447 switch (note->descsz)
448 {
449 default:
450 return FALSE;
451
452 case 144: /* Linux/i386 */
453 /* pr_cursig */
454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
455
456 /* pr_pid */
457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
458
459 /* pr_reg */
460 offset = 72;
461 size = 68;
462
463 break;
464 }
465 }
466
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
469 size, note->descpos + offset);
470 }
471
472 static bfd_boolean
473 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
474 {
475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
476 {
477 int pr_version = bfd_get_32 (abfd, note->descdata);
478
479 if (pr_version != 1)
480 return FALSE;
481
482 elf_tdata (abfd)->core->program
483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
484 elf_tdata (abfd)->core->command
485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
486 }
487 else
488 {
489 switch (note->descsz)
490 {
491 default:
492 return FALSE;
493
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd)->core->pid
496 = bfd_get_32 (abfd, note->descdata + 12);
497 elf_tdata (abfd)->core->program
498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
499 elf_tdata (abfd)->core->command
500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
501 }
502 }
503
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
507 {
508 char *command = elf_tdata (abfd)->core->command;
509 int n = strlen (command);
510
511 if (0 < n && command[n - 1] == ' ')
512 command[n - 1] = '\0';
513 }
514
515 return TRUE;
516 }
517 \f
518 /* Functions for the i386 ELF linker.
519
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
522 following:
523
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
530
531
532 /* The name of the dynamic interpreter. This is put in the .interp
533 section. */
534
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
536
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
540 shared lib. */
541 #define ELIMINATE_COPY_RELOCS 1
542
543 /* The size in bytes of an entry in the procedure linkage table. */
544
545 #define PLT_ENTRY_SIZE 16
546
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
550
551 static const bfd_byte elf_i386_plt0_entry[12] =
552 {
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
557 };
558
559 /* Subsequent entries in an absolute procedure linkage table look like
560 this. */
561
562 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
570 };
571
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
574
575 static const bfd_byte elf_i386_pic_plt0_entry[12] =
576 {
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
579 };
580
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
582
583 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
584 {
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
591 };
592
593 /* Entries in the GOT procedure linkage table look like this. */
594
595 static const bfd_byte elf_i386_got_plt_entry[8] =
596 {
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
600 };
601
602 /* Entries in the PIC GOT procedure linkage table look like this. */
603
604 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
605 {
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
609 };
610
611 /* .eh_frame covering the .plt section. */
612
613 static const bfd_byte elf_i386_eh_frame_plt[] =
614 {
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
621 1, /* CIE version */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop, DW_CFA_nop,
631
632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
646 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
648 };
649
650 struct elf_i386_plt_layout
651 {
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte *plt0_entry;
654 unsigned int plt0_entry_size;
655
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset;
658 unsigned int plt0_got2_offset;
659
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte *plt_entry;
662 unsigned int plt_entry_size;
663
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
668
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset;
671
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte *pic_plt0_entry;
674
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte *pic_plt_entry;
677
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte *eh_frame_plt;
680 unsigned int eh_frame_plt_size;
681 };
682
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
685
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt =
688 {
689 elf_i386_plt0_entry, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry, /* plt_entry */
694 PLT_ENTRY_SIZE, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry, /* pic_plt_entry */
701 elf_i386_eh_frame_plt, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
703 };
704 \f
705
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
711
712 /* Architecture-specific backend data for i386. */
713
714 struct elf_i386_backend_data
715 {
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout *plt;
718
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte;
721
722 /* True if the target system is VxWorks. */
723 int is_vxworks;
724 };
725
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
729
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed =
732 {
733 &elf_i386_plt, /* plt */
734 0, /* plt0_pad_byte */
735 0, /* is_vxworks */
736 };
737
738 #define elf_backend_arch_data &elf_i386_arch_bed
739
740 /* i386 ELF linker hash entry. */
741
742 struct elf_i386_link_hash_entry
743 {
744 struct elf_link_hash_entry elf;
745
746 /* Track dynamic relocs copied for this symbol. */
747 struct elf_dyn_relocs *dyn_relocs;
748
749 #define GOT_UNKNOWN 0
750 #define GOT_NORMAL 1
751 #define GOT_TLS_GD 2
752 #define GOT_TLS_IE 4
753 #define GOT_TLS_IE_POS 5
754 #define GOT_TLS_IE_NEG 6
755 #define GOT_TLS_IE_BOTH 7
756 #define GOT_TLS_GDESC 8
757 #define GOT_TLS_GD_BOTH_P(type) \
758 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
759 #define GOT_TLS_GD_P(type) \
760 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
761 #define GOT_TLS_GDESC_P(type) \
762 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GD_ANY_P(type) \
764 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
765 unsigned char tls_type;
766
767 /* Symbol is referenced by R_386_GOTOFF relocation. */
768 unsigned int gotoff_ref : 1;
769
770 /* Reference count of C/C++ function pointer relocations in read-write
771 section which can be resolved at run-time. */
772 bfd_signed_vma func_pointer_refcount;
773
774 /* Information about the GOT PLT entry. Filled when there are both
775 GOT and PLT relocations against the same function. */
776 union gotplt_union plt_got;
777
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
780 bfd_vma tlsdesc_got;
781 };
782
783 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
784
785 struct elf_i386_obj_tdata
786 {
787 struct elf_obj_tdata root;
788
789 /* tls_type for each local got entry. */
790 char *local_got_tls_type;
791
792 /* GOTPLT entries for TLS descriptors. */
793 bfd_vma *local_tlsdesc_gotent;
794 };
795
796 #define elf_i386_tdata(abfd) \
797 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
798
799 #define elf_i386_local_got_tls_type(abfd) \
800 (elf_i386_tdata (abfd)->local_got_tls_type)
801
802 #define elf_i386_local_tlsdesc_gotent(abfd) \
803 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
804
805 #define is_i386_elf(bfd) \
806 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
807 && elf_tdata (bfd) != NULL \
808 && elf_object_id (bfd) == I386_ELF_DATA)
809
810 static bfd_boolean
811 elf_i386_mkobject (bfd *abfd)
812 {
813 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
814 I386_ELF_DATA);
815 }
816
817 /* i386 ELF linker hash table. */
818
819 struct elf_i386_link_hash_table
820 {
821 struct elf_link_hash_table elf;
822
823 /* Short-cuts to get to dynamic linker sections. */
824 asection *sdynbss;
825 asection *srelbss;
826 asection *plt_eh_frame;
827 asection *plt_got;
828
829 union
830 {
831 bfd_signed_vma refcount;
832 bfd_vma offset;
833 } tls_ldm_got;
834
835 /* The amount of space used by the reserved portion of the sgotplt
836 section, plus whatever space is used by the jump slots. */
837 bfd_vma sgotplt_jump_table_size;
838
839 /* Small local sym cache. */
840 struct sym_cache sym_cache;
841
842 /* _TLS_MODULE_BASE_ symbol. */
843 struct bfd_link_hash_entry *tls_module_base;
844
845 /* Used by local STT_GNU_IFUNC symbols. */
846 htab_t loc_hash_table;
847 void * loc_hash_memory;
848
849 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
850 asection *srelplt2;
851
852 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
853 bfd_vma next_tls_desc_index;
854
855 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
856 bfd_vma next_jump_slot_index;
857
858 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
859 bfd_vma next_irelative_index;
860 };
861
862 /* Get the i386 ELF linker hash table from a link_info structure. */
863
864 #define elf_i386_hash_table(p) \
865 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
866 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
867
868 #define elf_i386_compute_jump_table_size(htab) \
869 ((htab)->elf.srelplt->reloc_count * 4)
870
871 /* Create an entry in an i386 ELF linker hash table. */
872
873 static struct bfd_hash_entry *
874 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
875 struct bfd_hash_table *table,
876 const char *string)
877 {
878 /* Allocate the structure if it has not already been allocated by a
879 subclass. */
880 if (entry == NULL)
881 {
882 entry = (struct bfd_hash_entry *)
883 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
884 if (entry == NULL)
885 return entry;
886 }
887
888 /* Call the allocation method of the superclass. */
889 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
890 if (entry != NULL)
891 {
892 struct elf_i386_link_hash_entry *eh;
893
894 eh = (struct elf_i386_link_hash_entry *) entry;
895 eh->dyn_relocs = NULL;
896 eh->tls_type = GOT_UNKNOWN;
897 eh->gotoff_ref = 0;
898 eh->func_pointer_refcount = 0;
899 eh->plt_got.offset = (bfd_vma) -1;
900 eh->tlsdesc_got = (bfd_vma) -1;
901 }
902
903 return entry;
904 }
905
906 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
907 for local symbol so that we can handle local STT_GNU_IFUNC symbols
908 as global symbol. We reuse indx and dynstr_index for local symbol
909 hash since they aren't used by global symbols in this backend. */
910
911 static hashval_t
912 elf_i386_local_htab_hash (const void *ptr)
913 {
914 struct elf_link_hash_entry *h
915 = (struct elf_link_hash_entry *) ptr;
916 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
917 }
918
919 /* Compare local hash entries. */
920
921 static int
922 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
923 {
924 struct elf_link_hash_entry *h1
925 = (struct elf_link_hash_entry *) ptr1;
926 struct elf_link_hash_entry *h2
927 = (struct elf_link_hash_entry *) ptr2;
928
929 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
930 }
931
932 /* Find and/or create a hash entry for local symbol. */
933
934 static struct elf_link_hash_entry *
935 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
936 bfd *abfd, const Elf_Internal_Rela *rel,
937 bfd_boolean create)
938 {
939 struct elf_i386_link_hash_entry e, *ret;
940 asection *sec = abfd->sections;
941 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
942 ELF32_R_SYM (rel->r_info));
943 void **slot;
944
945 e.elf.indx = sec->id;
946 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
947 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
948 create ? INSERT : NO_INSERT);
949
950 if (!slot)
951 return NULL;
952
953 if (*slot)
954 {
955 ret = (struct elf_i386_link_hash_entry *) *slot;
956 return &ret->elf;
957 }
958
959 ret = (struct elf_i386_link_hash_entry *)
960 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
961 sizeof (struct elf_i386_link_hash_entry));
962 if (ret)
963 {
964 memset (ret, 0, sizeof (*ret));
965 ret->elf.indx = sec->id;
966 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
967 ret->elf.dynindx = -1;
968 ret->func_pointer_refcount = 0;
969 ret->plt_got.offset = (bfd_vma) -1;
970 *slot = ret;
971 }
972 return &ret->elf;
973 }
974
975 /* Destroy an i386 ELF linker hash table. */
976
977 static void
978 elf_i386_link_hash_table_free (bfd *obfd)
979 {
980 struct elf_i386_link_hash_table *htab
981 = (struct elf_i386_link_hash_table *) obfd->link.hash;
982
983 if (htab->loc_hash_table)
984 htab_delete (htab->loc_hash_table);
985 if (htab->loc_hash_memory)
986 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
987 _bfd_elf_link_hash_table_free (obfd);
988 }
989
990 /* Create an i386 ELF linker hash table. */
991
992 static struct bfd_link_hash_table *
993 elf_i386_link_hash_table_create (bfd *abfd)
994 {
995 struct elf_i386_link_hash_table *ret;
996 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
997
998 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
999 if (ret == NULL)
1000 return NULL;
1001
1002 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1003 elf_i386_link_hash_newfunc,
1004 sizeof (struct elf_i386_link_hash_entry),
1005 I386_ELF_DATA))
1006 {
1007 free (ret);
1008 return NULL;
1009 }
1010
1011 ret->loc_hash_table = htab_try_create (1024,
1012 elf_i386_local_htab_hash,
1013 elf_i386_local_htab_eq,
1014 NULL);
1015 ret->loc_hash_memory = objalloc_create ();
1016 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1017 {
1018 elf_i386_link_hash_table_free (abfd);
1019 return NULL;
1020 }
1021 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1022
1023 return &ret->elf.root;
1024 }
1025
1026 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1027 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1028 hash table. */
1029
1030 static bfd_boolean
1031 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1032 {
1033 struct elf_i386_link_hash_table *htab;
1034
1035 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1036 return FALSE;
1037
1038 htab = elf_i386_hash_table (info);
1039 if (htab == NULL)
1040 return FALSE;
1041
1042 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1043 if (!htab->sdynbss)
1044 abort ();
1045
1046 if (bfd_link_executable (info))
1047 {
1048 /* Always allow copy relocs for building executables. */
1049 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1050 if (s == NULL)
1051 {
1052 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1053 s = bfd_make_section_anyway_with_flags (dynobj,
1054 ".rel.bss",
1055 (bed->dynamic_sec_flags
1056 | SEC_READONLY));
1057 if (s == NULL
1058 || ! bfd_set_section_alignment (dynobj, s,
1059 bed->s->log_file_align))
1060 return FALSE;
1061 }
1062 htab->srelbss = s;
1063 }
1064
1065 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1066 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1067 &htab->srelplt2))
1068 return FALSE;
1069
1070 if (!info->no_ld_generated_unwind_info
1071 && htab->plt_eh_frame == NULL
1072 && htab->elf.splt != NULL)
1073 {
1074 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1075 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1076 | SEC_LINKER_CREATED);
1077 htab->plt_eh_frame
1078 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1079 if (htab->plt_eh_frame == NULL
1080 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1081 return FALSE;
1082 }
1083
1084 return TRUE;
1085 }
1086
1087 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1088
1089 static void
1090 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1091 struct elf_link_hash_entry *dir,
1092 struct elf_link_hash_entry *ind)
1093 {
1094 struct elf_i386_link_hash_entry *edir, *eind;
1095
1096 edir = (struct elf_i386_link_hash_entry *) dir;
1097 eind = (struct elf_i386_link_hash_entry *) ind;
1098
1099 if (eind->dyn_relocs != NULL)
1100 {
1101 if (edir->dyn_relocs != NULL)
1102 {
1103 struct elf_dyn_relocs **pp;
1104 struct elf_dyn_relocs *p;
1105
1106 /* Add reloc counts against the indirect sym to the direct sym
1107 list. Merge any entries against the same section. */
1108 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1109 {
1110 struct elf_dyn_relocs *q;
1111
1112 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1113 if (q->sec == p->sec)
1114 {
1115 q->pc_count += p->pc_count;
1116 q->count += p->count;
1117 *pp = p->next;
1118 break;
1119 }
1120 if (q == NULL)
1121 pp = &p->next;
1122 }
1123 *pp = edir->dyn_relocs;
1124 }
1125
1126 edir->dyn_relocs = eind->dyn_relocs;
1127 eind->dyn_relocs = NULL;
1128 }
1129
1130 if (ind->root.type == bfd_link_hash_indirect
1131 && dir->got.refcount <= 0)
1132 {
1133 edir->tls_type = eind->tls_type;
1134 eind->tls_type = GOT_UNKNOWN;
1135 }
1136
1137 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1138 generate a R_386_COPY reloc. */
1139 edir->gotoff_ref |= eind->gotoff_ref;
1140
1141 if (ELIMINATE_COPY_RELOCS
1142 && ind->root.type != bfd_link_hash_indirect
1143 && dir->dynamic_adjusted)
1144 {
1145 /* If called to transfer flags for a weakdef during processing
1146 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1147 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1148 dir->ref_dynamic |= ind->ref_dynamic;
1149 dir->ref_regular |= ind->ref_regular;
1150 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1151 dir->needs_plt |= ind->needs_plt;
1152 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1153 }
1154 else
1155 {
1156 if (eind->func_pointer_refcount > 0)
1157 {
1158 edir->func_pointer_refcount += eind->func_pointer_refcount;
1159 eind->func_pointer_refcount = 0;
1160 }
1161
1162 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1163 }
1164 }
1165
1166 /* Return TRUE if the TLS access code sequence support transition
1167 from R_TYPE. */
1168
1169 static bfd_boolean
1170 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1171 bfd_byte *contents,
1172 Elf_Internal_Shdr *symtab_hdr,
1173 struct elf_link_hash_entry **sym_hashes,
1174 unsigned int r_type,
1175 const Elf_Internal_Rela *rel,
1176 const Elf_Internal_Rela *relend)
1177 {
1178 unsigned int val, type;
1179 unsigned long r_symndx;
1180 struct elf_link_hash_entry *h;
1181 bfd_vma offset;
1182
1183 /* Get the section contents. */
1184 if (contents == NULL)
1185 {
1186 if (elf_section_data (sec)->this_hdr.contents != NULL)
1187 contents = elf_section_data (sec)->this_hdr.contents;
1188 else
1189 {
1190 /* FIXME: How to better handle error condition? */
1191 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1192 return FALSE;
1193
1194 /* Cache the section contents for elf_link_input_bfd. */
1195 elf_section_data (sec)->this_hdr.contents = contents;
1196 }
1197 }
1198
1199 offset = rel->r_offset;
1200 switch (r_type)
1201 {
1202 case R_386_TLS_GD:
1203 case R_386_TLS_LDM:
1204 if (offset < 2 || (rel + 1) >= relend)
1205 return FALSE;
1206
1207 type = bfd_get_8 (abfd, contents + offset - 2);
1208 if (r_type == R_386_TLS_GD)
1209 {
1210 /* Check transition from GD access model. Only
1211 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1212 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1213 can transit to different access model. */
1214 if ((offset + 10) > sec->size ||
1215 (type != 0x8d && type != 0x04))
1216 return FALSE;
1217
1218 val = bfd_get_8 (abfd, contents + offset - 1);
1219 if (type == 0x04)
1220 {
1221 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1222 if (offset < 3)
1223 return FALSE;
1224
1225 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1226 return FALSE;
1227
1228 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1229 return FALSE;
1230 }
1231 else
1232 {
1233 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1234 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1235 return FALSE;
1236
1237 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1238 return FALSE;
1239 }
1240 }
1241 else
1242 {
1243 /* Check transition from LD access model. Only
1244 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1245 can transit to different access model. */
1246 if (type != 0x8d || (offset + 9) > sec->size)
1247 return FALSE;
1248
1249 val = bfd_get_8 (abfd, contents + offset - 1);
1250 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1251 return FALSE;
1252 }
1253
1254 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1255 return FALSE;
1256
1257 r_symndx = ELF32_R_SYM (rel[1].r_info);
1258 if (r_symndx < symtab_hdr->sh_info)
1259 return FALSE;
1260
1261 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1262 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1263 may be versioned. */
1264 return (h != NULL
1265 && h->root.root.string != NULL
1266 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1267 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1268 && (strncmp (h->root.root.string, "___tls_get_addr",
1269 15) == 0));
1270
1271 case R_386_TLS_IE:
1272 /* Check transition from IE access model:
1273 movl foo@indntpoff(%rip), %eax
1274 movl foo@indntpoff(%rip), %reg
1275 addl foo@indntpoff(%rip), %reg
1276 */
1277
1278 if (offset < 1 || (offset + 4) > sec->size)
1279 return FALSE;
1280
1281 /* Check "movl foo@tpoff(%rip), %eax" first. */
1282 val = bfd_get_8 (abfd, contents + offset - 1);
1283 if (val == 0xa1)
1284 return TRUE;
1285
1286 if (offset < 2)
1287 return FALSE;
1288
1289 /* Check movl|addl foo@tpoff(%rip), %reg. */
1290 type = bfd_get_8 (abfd, contents + offset - 2);
1291 return ((type == 0x8b || type == 0x03)
1292 && (val & 0xc7) == 0x05);
1293
1294 case R_386_TLS_GOTIE:
1295 case R_386_TLS_IE_32:
1296 /* Check transition from {IE_32,GOTIE} access model:
1297 subl foo@{tpoff,gontoff}(%reg1), %reg2
1298 movl foo@{tpoff,gontoff}(%reg1), %reg2
1299 addl foo@{tpoff,gontoff}(%reg1), %reg2
1300 */
1301
1302 if (offset < 2 || (offset + 4) > sec->size)
1303 return FALSE;
1304
1305 val = bfd_get_8 (abfd, contents + offset - 1);
1306 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1307 return FALSE;
1308
1309 type = bfd_get_8 (abfd, contents + offset - 2);
1310 return type == 0x8b || type == 0x2b || type == 0x03;
1311
1312 case R_386_TLS_GOTDESC:
1313 /* Check transition from GDesc access model:
1314 leal x@tlsdesc(%ebx), %eax
1315
1316 Make sure it's a leal adding ebx to a 32-bit offset
1317 into any register, although it's probably almost always
1318 going to be eax. */
1319
1320 if (offset < 2 || (offset + 4) > sec->size)
1321 return FALSE;
1322
1323 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1324 return FALSE;
1325
1326 val = bfd_get_8 (abfd, contents + offset - 1);
1327 return (val & 0xc7) == 0x83;
1328
1329 case R_386_TLS_DESC_CALL:
1330 /* Check transition from GDesc access model:
1331 call *x@tlsdesc(%rax)
1332 */
1333 if (offset + 2 <= sec->size)
1334 {
1335 /* Make sure that it's a call *x@tlsdesc(%rax). */
1336 static const unsigned char call[] = { 0xff, 0x10 };
1337 return memcmp (contents + offset, call, 2) == 0;
1338 }
1339
1340 return FALSE;
1341
1342 default:
1343 abort ();
1344 }
1345 }
1346
1347 /* Return TRUE if the TLS access transition is OK or no transition
1348 will be performed. Update R_TYPE if there is a transition. */
1349
1350 static bfd_boolean
1351 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1352 asection *sec, bfd_byte *contents,
1353 Elf_Internal_Shdr *symtab_hdr,
1354 struct elf_link_hash_entry **sym_hashes,
1355 unsigned int *r_type, int tls_type,
1356 const Elf_Internal_Rela *rel,
1357 const Elf_Internal_Rela *relend,
1358 struct elf_link_hash_entry *h,
1359 unsigned long r_symndx)
1360 {
1361 unsigned int from_type = *r_type;
1362 unsigned int to_type = from_type;
1363 bfd_boolean check = TRUE;
1364
1365 /* Skip TLS transition for functions. */
1366 if (h != NULL
1367 && (h->type == STT_FUNC
1368 || h->type == STT_GNU_IFUNC))
1369 return TRUE;
1370
1371 switch (from_type)
1372 {
1373 case R_386_TLS_GD:
1374 case R_386_TLS_GOTDESC:
1375 case R_386_TLS_DESC_CALL:
1376 case R_386_TLS_IE_32:
1377 case R_386_TLS_IE:
1378 case R_386_TLS_GOTIE:
1379 if (bfd_link_executable (info))
1380 {
1381 if (h == NULL)
1382 to_type = R_386_TLS_LE_32;
1383 else if (from_type != R_386_TLS_IE
1384 && from_type != R_386_TLS_GOTIE)
1385 to_type = R_386_TLS_IE_32;
1386 }
1387
1388 /* When we are called from elf_i386_relocate_section, CONTENTS
1389 isn't NULL and there may be additional transitions based on
1390 TLS_TYPE. */
1391 if (contents != NULL)
1392 {
1393 unsigned int new_to_type = to_type;
1394
1395 if (bfd_link_executable (info)
1396 && h != NULL
1397 && h->dynindx == -1
1398 && (tls_type & GOT_TLS_IE))
1399 new_to_type = R_386_TLS_LE_32;
1400
1401 if (to_type == R_386_TLS_GD
1402 || to_type == R_386_TLS_GOTDESC
1403 || to_type == R_386_TLS_DESC_CALL)
1404 {
1405 if (tls_type == GOT_TLS_IE_POS)
1406 new_to_type = R_386_TLS_GOTIE;
1407 else if (tls_type & GOT_TLS_IE)
1408 new_to_type = R_386_TLS_IE_32;
1409 }
1410
1411 /* We checked the transition before when we were called from
1412 elf_i386_check_relocs. We only want to check the new
1413 transition which hasn't been checked before. */
1414 check = new_to_type != to_type && from_type == to_type;
1415 to_type = new_to_type;
1416 }
1417
1418 break;
1419
1420 case R_386_TLS_LDM:
1421 if (bfd_link_executable (info))
1422 to_type = R_386_TLS_LE_32;
1423 break;
1424
1425 default:
1426 return TRUE;
1427 }
1428
1429 /* Return TRUE if there is no transition. */
1430 if (from_type == to_type)
1431 return TRUE;
1432
1433 /* Check if the transition can be performed. */
1434 if (check
1435 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1436 symtab_hdr, sym_hashes,
1437 from_type, rel, relend))
1438 {
1439 reloc_howto_type *from, *to;
1440 const char *name;
1441
1442 from = elf_i386_rtype_to_howto (abfd, from_type);
1443 to = elf_i386_rtype_to_howto (abfd, to_type);
1444
1445 if (h)
1446 name = h->root.root.string;
1447 else
1448 {
1449 struct elf_i386_link_hash_table *htab;
1450
1451 htab = elf_i386_hash_table (info);
1452 if (htab == NULL)
1453 name = "*unknown*";
1454 else
1455 {
1456 Elf_Internal_Sym *isym;
1457
1458 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1459 abfd, r_symndx);
1460 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1461 }
1462 }
1463
1464 (*_bfd_error_handler)
1465 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1466 "in section `%A' failed"),
1467 abfd, sec, from->name, to->name, name,
1468 (unsigned long) rel->r_offset);
1469 bfd_set_error (bfd_error_bad_value);
1470 return FALSE;
1471 }
1472
1473 *r_type = to_type;
1474 return TRUE;
1475 }
1476
1477 /* Rename some of the generic section flags to better document how they
1478 are used here. */
1479 #define need_convert_load sec_flg0
1480
1481 /* Look through the relocs for a section during the first phase, and
1482 calculate needed space in the global offset table, procedure linkage
1483 table, and dynamic reloc sections. */
1484
1485 static bfd_boolean
1486 elf_i386_check_relocs (bfd *abfd,
1487 struct bfd_link_info *info,
1488 asection *sec,
1489 const Elf_Internal_Rela *relocs)
1490 {
1491 struct elf_i386_link_hash_table *htab;
1492 Elf_Internal_Shdr *symtab_hdr;
1493 struct elf_link_hash_entry **sym_hashes;
1494 const Elf_Internal_Rela *rel;
1495 const Elf_Internal_Rela *rel_end;
1496 asection *sreloc;
1497 bfd_boolean use_plt_got;
1498
1499 if (bfd_link_relocatable (info))
1500 return TRUE;
1501
1502 BFD_ASSERT (is_i386_elf (abfd));
1503
1504 htab = elf_i386_hash_table (info);
1505 if (htab == NULL)
1506 return FALSE;
1507
1508 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1509 && (get_elf_i386_backend_data (abfd)
1510 == &elf_i386_arch_bed));
1511
1512 symtab_hdr = &elf_symtab_hdr (abfd);
1513 sym_hashes = elf_sym_hashes (abfd);
1514
1515 sreloc = NULL;
1516
1517 rel_end = relocs + sec->reloc_count;
1518 for (rel = relocs; rel < rel_end; rel++)
1519 {
1520 unsigned int r_type;
1521 unsigned long r_symndx;
1522 struct elf_link_hash_entry *h;
1523 struct elf_i386_link_hash_entry *eh;
1524 Elf_Internal_Sym *isym;
1525 const char *name;
1526 bfd_boolean size_reloc;
1527
1528 r_symndx = ELF32_R_SYM (rel->r_info);
1529 r_type = ELF32_R_TYPE (rel->r_info);
1530
1531 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1532 {
1533 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1534 abfd,
1535 r_symndx);
1536 return FALSE;
1537 }
1538
1539 if (r_symndx < symtab_hdr->sh_info)
1540 {
1541 /* A local symbol. */
1542 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1543 abfd, r_symndx);
1544 if (isym == NULL)
1545 return FALSE;
1546
1547 /* Check relocation against local STT_GNU_IFUNC symbol. */
1548 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1549 {
1550 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1551 if (h == NULL)
1552 return FALSE;
1553
1554 /* Fake a STT_GNU_IFUNC symbol. */
1555 h->type = STT_GNU_IFUNC;
1556 h->def_regular = 1;
1557 h->ref_regular = 1;
1558 h->forced_local = 1;
1559 h->root.type = bfd_link_hash_defined;
1560 }
1561 else
1562 h = NULL;
1563 }
1564 else
1565 {
1566 isym = NULL;
1567 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1568 while (h->root.type == bfd_link_hash_indirect
1569 || h->root.type == bfd_link_hash_warning)
1570 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1571 }
1572
1573 eh = (struct elf_i386_link_hash_entry *) h;
1574 if (h != NULL)
1575 {
1576 /* Create the ifunc sections for static executables. If we
1577 never see an indirect function symbol nor we are building
1578 a static executable, those sections will be empty and
1579 won't appear in output. */
1580 switch (r_type)
1581 {
1582 default:
1583 break;
1584
1585 case R_386_GOTOFF:
1586 eh->gotoff_ref = 1;
1587 case R_386_32:
1588 case R_386_PC32:
1589 case R_386_PLT32:
1590 case R_386_GOT32:
1591 case R_386_GOT32X:
1592 if (htab->elf.dynobj == NULL)
1593 htab->elf.dynobj = abfd;
1594 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1595 return FALSE;
1596 break;
1597 }
1598
1599 /* It is referenced by a non-shared object. */
1600 h->ref_regular = 1;
1601 h->root.non_ir_ref = 1;
1602
1603 if (h->type == STT_GNU_IFUNC)
1604 elf_tdata (info->output_bfd)->has_gnu_symbols
1605 |= elf_gnu_symbol_ifunc;
1606 }
1607
1608 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1609 symtab_hdr, sym_hashes,
1610 &r_type, GOT_UNKNOWN,
1611 rel, rel_end, h, r_symndx))
1612 return FALSE;
1613
1614 switch (r_type)
1615 {
1616 case R_386_TLS_LDM:
1617 htab->tls_ldm_got.refcount += 1;
1618 goto create_got;
1619
1620 case R_386_PLT32:
1621 /* This symbol requires a procedure linkage table entry. We
1622 actually build the entry in adjust_dynamic_symbol,
1623 because this might be a case of linking PIC code which is
1624 never referenced by a dynamic object, in which case we
1625 don't need to generate a procedure linkage table entry
1626 after all. */
1627
1628 /* If this is a local symbol, we resolve it directly without
1629 creating a procedure linkage table entry. */
1630 if (h == NULL)
1631 continue;
1632
1633 h->needs_plt = 1;
1634 h->plt.refcount += 1;
1635 break;
1636
1637 case R_386_SIZE32:
1638 size_reloc = TRUE;
1639 goto do_size;
1640
1641 case R_386_TLS_IE_32:
1642 case R_386_TLS_IE:
1643 case R_386_TLS_GOTIE:
1644 if (!bfd_link_executable (info))
1645 info->flags |= DF_STATIC_TLS;
1646 /* Fall through */
1647
1648 case R_386_GOT32:
1649 case R_386_GOT32X:
1650 case R_386_TLS_GD:
1651 case R_386_TLS_GOTDESC:
1652 case R_386_TLS_DESC_CALL:
1653 /* This symbol requires a global offset table entry. */
1654 {
1655 int tls_type, old_tls_type;
1656
1657 switch (r_type)
1658 {
1659 default:
1660 case R_386_GOT32:
1661 case R_386_GOT32X:
1662 tls_type = GOT_NORMAL;
1663 break;
1664 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1665 case R_386_TLS_GOTDESC:
1666 case R_386_TLS_DESC_CALL:
1667 tls_type = GOT_TLS_GDESC; break;
1668 case R_386_TLS_IE_32:
1669 if (ELF32_R_TYPE (rel->r_info) == r_type)
1670 tls_type = GOT_TLS_IE_NEG;
1671 else
1672 /* If this is a GD->IE transition, we may use either of
1673 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1674 tls_type = GOT_TLS_IE;
1675 break;
1676 case R_386_TLS_IE:
1677 case R_386_TLS_GOTIE:
1678 tls_type = GOT_TLS_IE_POS; break;
1679 }
1680
1681 if (h != NULL)
1682 {
1683 h->got.refcount += 1;
1684 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1685 }
1686 else
1687 {
1688 bfd_signed_vma *local_got_refcounts;
1689
1690 /* This is a global offset table entry for a local symbol. */
1691 local_got_refcounts = elf_local_got_refcounts (abfd);
1692 if (local_got_refcounts == NULL)
1693 {
1694 bfd_size_type size;
1695
1696 size = symtab_hdr->sh_info;
1697 size *= (sizeof (bfd_signed_vma)
1698 + sizeof (bfd_vma) + sizeof(char));
1699 local_got_refcounts = (bfd_signed_vma *)
1700 bfd_zalloc (abfd, size);
1701 if (local_got_refcounts == NULL)
1702 return FALSE;
1703 elf_local_got_refcounts (abfd) = local_got_refcounts;
1704 elf_i386_local_tlsdesc_gotent (abfd)
1705 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1706 elf_i386_local_got_tls_type (abfd)
1707 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1708 }
1709 local_got_refcounts[r_symndx] += 1;
1710 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1711 }
1712
1713 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1714 tls_type |= old_tls_type;
1715 /* If a TLS symbol is accessed using IE at least once,
1716 there is no point to use dynamic model for it. */
1717 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1718 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1719 || (tls_type & GOT_TLS_IE) == 0))
1720 {
1721 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1722 tls_type = old_tls_type;
1723 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1724 && GOT_TLS_GD_ANY_P (tls_type))
1725 tls_type |= old_tls_type;
1726 else
1727 {
1728 if (h)
1729 name = h->root.root.string;
1730 else
1731 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1732 NULL);
1733 (*_bfd_error_handler)
1734 (_("%B: `%s' accessed both as normal and "
1735 "thread local symbol"),
1736 abfd, name);
1737 bfd_set_error (bfd_error_bad_value);
1738 return FALSE;
1739 }
1740 }
1741
1742 if (old_tls_type != tls_type)
1743 {
1744 if (h != NULL)
1745 elf_i386_hash_entry (h)->tls_type = tls_type;
1746 else
1747 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1748 }
1749 }
1750 /* Fall through */
1751
1752 case R_386_GOTOFF:
1753 case R_386_GOTPC:
1754 create_got:
1755 if (htab->elf.sgot == NULL)
1756 {
1757 if (htab->elf.dynobj == NULL)
1758 htab->elf.dynobj = abfd;
1759 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1760 return FALSE;
1761 }
1762 if (r_type != R_386_TLS_IE)
1763 break;
1764 /* Fall through */
1765
1766 case R_386_TLS_LE_32:
1767 case R_386_TLS_LE:
1768 if (bfd_link_executable (info))
1769 break;
1770 info->flags |= DF_STATIC_TLS;
1771 /* Fall through */
1772
1773 case R_386_32:
1774 case R_386_PC32:
1775 if (h != NULL && bfd_link_executable (info))
1776 {
1777 /* If this reloc is in a read-only section, we might
1778 need a copy reloc. We can't check reliably at this
1779 stage whether the section is read-only, as input
1780 sections have not yet been mapped to output sections.
1781 Tentatively set the flag for now, and correct in
1782 adjust_dynamic_symbol. */
1783 h->non_got_ref = 1;
1784
1785 /* We may need a .plt entry if the function this reloc
1786 refers to is in a shared lib. */
1787 h->plt.refcount += 1;
1788 if (r_type == R_386_PC32)
1789 {
1790 /* Since something like ".long foo - ." may be used
1791 as pointer, make sure that PLT is used if foo is
1792 a function defined in a shared library. */
1793 if ((sec->flags & SEC_CODE) == 0)
1794 h->pointer_equality_needed = 1;
1795 }
1796 else
1797 {
1798 h->pointer_equality_needed = 1;
1799 /* R_386_32 can be resolved at run-time. */
1800 if (r_type == R_386_32
1801 && (sec->flags & SEC_READONLY) == 0)
1802 eh->func_pointer_refcount += 1;
1803 }
1804 }
1805
1806 size_reloc = FALSE;
1807 do_size:
1808 /* If we are creating a shared library, and this is a reloc
1809 against a global symbol, or a non PC relative reloc
1810 against a local symbol, then we need to copy the reloc
1811 into the shared library. However, if we are linking with
1812 -Bsymbolic, we do not need to copy a reloc against a
1813 global symbol which is defined in an object we are
1814 including in the link (i.e., DEF_REGULAR is set). At
1815 this point we have not seen all the input files, so it is
1816 possible that DEF_REGULAR is not set now but will be set
1817 later (it is never cleared). In case of a weak definition,
1818 DEF_REGULAR may be cleared later by a strong definition in
1819 a shared library. We account for that possibility below by
1820 storing information in the relocs_copied field of the hash
1821 table entry. A similar situation occurs when creating
1822 shared libraries and symbol visibility changes render the
1823 symbol local.
1824
1825 If on the other hand, we are creating an executable, we
1826 may need to keep relocations for symbols satisfied by a
1827 dynamic library if we manage to avoid copy relocs for the
1828 symbol. */
1829 if ((bfd_link_pic (info)
1830 && (sec->flags & SEC_ALLOC) != 0
1831 && (r_type != R_386_PC32
1832 || (h != NULL
1833 && (! SYMBOLIC_BIND (info, h)
1834 || h->root.type == bfd_link_hash_defweak
1835 || !h->def_regular))))
1836 || (ELIMINATE_COPY_RELOCS
1837 && !bfd_link_pic (info)
1838 && (sec->flags & SEC_ALLOC) != 0
1839 && h != NULL
1840 && (h->root.type == bfd_link_hash_defweak
1841 || !h->def_regular)))
1842 {
1843 struct elf_dyn_relocs *p;
1844 struct elf_dyn_relocs **head;
1845
1846 /* We must copy these reloc types into the output file.
1847 Create a reloc section in dynobj and make room for
1848 this reloc. */
1849 if (sreloc == NULL)
1850 {
1851 if (htab->elf.dynobj == NULL)
1852 htab->elf.dynobj = abfd;
1853
1854 sreloc = _bfd_elf_make_dynamic_reloc_section
1855 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1856
1857 if (sreloc == NULL)
1858 return FALSE;
1859 }
1860
1861 /* If this is a global symbol, we count the number of
1862 relocations we need for this symbol. */
1863 if (h != NULL)
1864 {
1865 head = &eh->dyn_relocs;
1866 }
1867 else
1868 {
1869 /* Track dynamic relocs needed for local syms too.
1870 We really need local syms available to do this
1871 easily. Oh well. */
1872 void **vpp;
1873 asection *s;
1874
1875 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1876 abfd, r_symndx);
1877 if (isym == NULL)
1878 return FALSE;
1879
1880 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1881 if (s == NULL)
1882 s = sec;
1883
1884 vpp = &elf_section_data (s)->local_dynrel;
1885 head = (struct elf_dyn_relocs **)vpp;
1886 }
1887
1888 p = *head;
1889 if (p == NULL || p->sec != sec)
1890 {
1891 bfd_size_type amt = sizeof *p;
1892 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1893 amt);
1894 if (p == NULL)
1895 return FALSE;
1896 p->next = *head;
1897 *head = p;
1898 p->sec = sec;
1899 p->count = 0;
1900 p->pc_count = 0;
1901 }
1902
1903 p->count += 1;
1904 /* Count size relocation as PC-relative relocation. */
1905 if (r_type == R_386_PC32 || size_reloc)
1906 p->pc_count += 1;
1907 }
1908 break;
1909
1910 /* This relocation describes the C++ object vtable hierarchy.
1911 Reconstruct it for later use during GC. */
1912 case R_386_GNU_VTINHERIT:
1913 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1914 return FALSE;
1915 break;
1916
1917 /* This relocation describes which C++ vtable entries are actually
1918 used. Record for later use during GC. */
1919 case R_386_GNU_VTENTRY:
1920 BFD_ASSERT (h != NULL);
1921 if (h != NULL
1922 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1923 return FALSE;
1924 break;
1925
1926 default:
1927 break;
1928 }
1929
1930 if (use_plt_got
1931 && h != NULL
1932 && h->plt.refcount > 0
1933 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1934 || h->got.refcount > 0)
1935 && htab->plt_got == NULL)
1936 {
1937 /* Create the GOT procedure linkage table. */
1938 unsigned int plt_got_align;
1939 const struct elf_backend_data *bed;
1940
1941 bed = get_elf_backend_data (info->output_bfd);
1942 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1943 && (sizeof (elf_i386_got_plt_entry)
1944 == sizeof (elf_i386_pic_got_plt_entry)));
1945 plt_got_align = 3;
1946
1947 if (htab->elf.dynobj == NULL)
1948 htab->elf.dynobj = abfd;
1949 htab->plt_got
1950 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1951 ".plt.got",
1952 (bed->dynamic_sec_flags
1953 | SEC_ALLOC
1954 | SEC_CODE
1955 | SEC_LOAD
1956 | SEC_READONLY));
1957 if (htab->plt_got == NULL
1958 || !bfd_set_section_alignment (htab->elf.dynobj,
1959 htab->plt_got,
1960 plt_got_align))
1961 return FALSE;
1962 }
1963
1964 if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
1965 && (h == NULL || h->type != STT_GNU_IFUNC))
1966 sec->need_convert_load = 1;
1967 }
1968
1969 return TRUE;
1970 }
1971
1972 /* Return the section that should be marked against GC for a given
1973 relocation. */
1974
1975 static asection *
1976 elf_i386_gc_mark_hook (asection *sec,
1977 struct bfd_link_info *info,
1978 Elf_Internal_Rela *rel,
1979 struct elf_link_hash_entry *h,
1980 Elf_Internal_Sym *sym)
1981 {
1982 if (h != NULL)
1983 switch (ELF32_R_TYPE (rel->r_info))
1984 {
1985 case R_386_GNU_VTINHERIT:
1986 case R_386_GNU_VTENTRY:
1987 return NULL;
1988 }
1989
1990 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1991 }
1992
1993 /* Update the got entry reference counts for the section being removed. */
1994
1995 static bfd_boolean
1996 elf_i386_gc_sweep_hook (bfd *abfd,
1997 struct bfd_link_info *info,
1998 asection *sec,
1999 const Elf_Internal_Rela *relocs)
2000 {
2001 struct elf_i386_link_hash_table *htab;
2002 Elf_Internal_Shdr *symtab_hdr;
2003 struct elf_link_hash_entry **sym_hashes;
2004 bfd_signed_vma *local_got_refcounts;
2005 const Elf_Internal_Rela *rel, *relend;
2006
2007 if (bfd_link_relocatable (info))
2008 return TRUE;
2009
2010 htab = elf_i386_hash_table (info);
2011 if (htab == NULL)
2012 return FALSE;
2013
2014 elf_section_data (sec)->local_dynrel = NULL;
2015
2016 symtab_hdr = &elf_symtab_hdr (abfd);
2017 sym_hashes = elf_sym_hashes (abfd);
2018 local_got_refcounts = elf_local_got_refcounts (abfd);
2019
2020 relend = relocs + sec->reloc_count;
2021 for (rel = relocs; rel < relend; rel++)
2022 {
2023 unsigned long r_symndx;
2024 unsigned int r_type;
2025 struct elf_link_hash_entry *h = NULL;
2026
2027 r_symndx = ELF32_R_SYM (rel->r_info);
2028 if (r_symndx >= symtab_hdr->sh_info)
2029 {
2030 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2031 while (h->root.type == bfd_link_hash_indirect
2032 || h->root.type == bfd_link_hash_warning)
2033 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2034 }
2035 else
2036 {
2037 /* A local symbol. */
2038 Elf_Internal_Sym *isym;
2039
2040 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2041 abfd, r_symndx);
2042
2043 /* Check relocation against local STT_GNU_IFUNC symbol. */
2044 if (isym != NULL
2045 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2046 {
2047 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2048 if (h == NULL)
2049 abort ();
2050 }
2051 }
2052
2053 if (h)
2054 {
2055 struct elf_i386_link_hash_entry *eh;
2056 struct elf_dyn_relocs **pp;
2057 struct elf_dyn_relocs *p;
2058
2059 eh = (struct elf_i386_link_hash_entry *) h;
2060 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2061 if (p->sec == sec)
2062 {
2063 /* Everything must go for SEC. */
2064 *pp = p->next;
2065 break;
2066 }
2067 }
2068
2069 r_type = ELF32_R_TYPE (rel->r_info);
2070 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2071 symtab_hdr, sym_hashes,
2072 &r_type, GOT_UNKNOWN,
2073 rel, relend, h, r_symndx))
2074 return FALSE;
2075
2076 switch (r_type)
2077 {
2078 case R_386_TLS_LDM:
2079 if (htab->tls_ldm_got.refcount > 0)
2080 htab->tls_ldm_got.refcount -= 1;
2081 break;
2082
2083 case R_386_TLS_GD:
2084 case R_386_TLS_GOTDESC:
2085 case R_386_TLS_DESC_CALL:
2086 case R_386_TLS_IE_32:
2087 case R_386_TLS_IE:
2088 case R_386_TLS_GOTIE:
2089 case R_386_GOT32:
2090 case R_386_GOT32X:
2091 if (h != NULL)
2092 {
2093 if (h->got.refcount > 0)
2094 h->got.refcount -= 1;
2095 if (h->type == STT_GNU_IFUNC)
2096 {
2097 if (h->plt.refcount > 0)
2098 h->plt.refcount -= 1;
2099 }
2100 }
2101 else if (local_got_refcounts != NULL)
2102 {
2103 if (local_got_refcounts[r_symndx] > 0)
2104 local_got_refcounts[r_symndx] -= 1;
2105 }
2106 break;
2107
2108 case R_386_32:
2109 case R_386_PC32:
2110 case R_386_SIZE32:
2111 if (bfd_link_pic (info)
2112 && (h == NULL || h->type != STT_GNU_IFUNC))
2113 break;
2114 /* Fall through */
2115
2116 case R_386_PLT32:
2117 if (h != NULL)
2118 {
2119 if (h->plt.refcount > 0)
2120 h->plt.refcount -= 1;
2121 if (r_type == R_386_32
2122 && (sec->flags & SEC_READONLY) == 0)
2123 {
2124 struct elf_i386_link_hash_entry *eh
2125 = (struct elf_i386_link_hash_entry *) h;
2126 if (eh->func_pointer_refcount > 0)
2127 eh->func_pointer_refcount -= 1;
2128 }
2129 }
2130 break;
2131
2132 case R_386_GOTOFF:
2133 if (h != NULL && h->type == STT_GNU_IFUNC)
2134 {
2135 if (h->got.refcount > 0)
2136 h->got.refcount -= 1;
2137 if (h->plt.refcount > 0)
2138 h->plt.refcount -= 1;
2139 }
2140 break;
2141
2142 default:
2143 break;
2144 }
2145 }
2146
2147 return TRUE;
2148 }
2149
2150 /* Adjust a symbol defined by a dynamic object and referenced by a
2151 regular object. The current definition is in some section of the
2152 dynamic object, but we're not including those sections. We have to
2153 change the definition to something the rest of the link can
2154 understand. */
2155
2156 static bfd_boolean
2157 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2158 struct elf_link_hash_entry *h)
2159 {
2160 struct elf_i386_link_hash_table *htab;
2161 asection *s;
2162 struct elf_i386_link_hash_entry *eh;
2163 struct elf_dyn_relocs *p;
2164
2165 /* STT_GNU_IFUNC symbol must go through PLT. */
2166 if (h->type == STT_GNU_IFUNC)
2167 {
2168 /* All local STT_GNU_IFUNC references must be treate as local
2169 calls via local PLT. */
2170 if (h->ref_regular
2171 && SYMBOL_CALLS_LOCAL (info, h))
2172 {
2173 bfd_size_type pc_count = 0, count = 0;
2174 struct elf_dyn_relocs **pp;
2175
2176 eh = (struct elf_i386_link_hash_entry *) h;
2177 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2178 {
2179 pc_count += p->pc_count;
2180 p->count -= p->pc_count;
2181 p->pc_count = 0;
2182 count += p->count;
2183 if (p->count == 0)
2184 *pp = p->next;
2185 else
2186 pp = &p->next;
2187 }
2188
2189 if (pc_count || count)
2190 {
2191 h->needs_plt = 1;
2192 h->non_got_ref = 1;
2193 if (h->plt.refcount <= 0)
2194 h->plt.refcount = 1;
2195 else
2196 h->plt.refcount += 1;
2197 }
2198 }
2199
2200 if (h->plt.refcount <= 0)
2201 {
2202 h->plt.offset = (bfd_vma) -1;
2203 h->needs_plt = 0;
2204 }
2205 return TRUE;
2206 }
2207
2208 /* If this is a function, put it in the procedure linkage table. We
2209 will fill in the contents of the procedure linkage table later,
2210 when we know the address of the .got section. */
2211 if (h->type == STT_FUNC
2212 || h->needs_plt)
2213 {
2214 if (h->plt.refcount <= 0
2215 || SYMBOL_CALLS_LOCAL (info, h)
2216 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2217 && h->root.type == bfd_link_hash_undefweak))
2218 {
2219 /* This case can occur if we saw a PLT32 reloc in an input
2220 file, but the symbol was never referred to by a dynamic
2221 object, or if all references were garbage collected. In
2222 such a case, we don't actually need to build a procedure
2223 linkage table, and we can just do a PC32 reloc instead. */
2224 h->plt.offset = (bfd_vma) -1;
2225 h->needs_plt = 0;
2226 }
2227
2228 return TRUE;
2229 }
2230 else
2231 /* It's possible that we incorrectly decided a .plt reloc was
2232 needed for an R_386_PC32 reloc to a non-function sym in
2233 check_relocs. We can't decide accurately between function and
2234 non-function syms in check-relocs; Objects loaded later in
2235 the link may change h->type. So fix it now. */
2236 h->plt.offset = (bfd_vma) -1;
2237
2238 /* If this is a weak symbol, and there is a real definition, the
2239 processor independent code will have arranged for us to see the
2240 real definition first, and we can just use the same value. */
2241 if (h->u.weakdef != NULL)
2242 {
2243 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2244 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2245 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2246 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2247 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2248 h->non_got_ref = h->u.weakdef->non_got_ref;
2249 return TRUE;
2250 }
2251
2252 /* This is a reference to a symbol defined by a dynamic object which
2253 is not a function. */
2254
2255 /* If we are creating a shared library, we must presume that the
2256 only references to the symbol are via the global offset table.
2257 For such cases we need not do anything here; the relocations will
2258 be handled correctly by relocate_section. */
2259 if (!bfd_link_executable (info))
2260 return TRUE;
2261
2262 /* If there are no references to this symbol that do not use the
2263 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2264 reloc. */
2265 eh = (struct elf_i386_link_hash_entry *) h;
2266 if (!h->non_got_ref && !eh->gotoff_ref)
2267 return TRUE;
2268
2269 /* If -z nocopyreloc was given, we won't generate them either. */
2270 if (info->nocopyreloc)
2271 {
2272 h->non_got_ref = 0;
2273 return TRUE;
2274 }
2275
2276 htab = elf_i386_hash_table (info);
2277 if (htab == NULL)
2278 return FALSE;
2279
2280 /* If there aren't any dynamic relocs in read-only sections nor
2281 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2282 avoid the copy reloc. This doesn't work on VxWorks, where we can
2283 not have dynamic relocations (other than copy and jump slot
2284 relocations) in an executable. */
2285 if (ELIMINATE_COPY_RELOCS
2286 && !eh->gotoff_ref
2287 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2288 {
2289 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2290 {
2291 s = p->sec->output_section;
2292 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2293 break;
2294 }
2295
2296 if (p == NULL)
2297 {
2298 h->non_got_ref = 0;
2299 return TRUE;
2300 }
2301 }
2302
2303 /* We must allocate the symbol in our .dynbss section, which will
2304 become part of the .bss section of the executable. There will be
2305 an entry for this symbol in the .dynsym section. The dynamic
2306 object will contain position independent code, so all references
2307 from the dynamic object to this symbol will go through the global
2308 offset table. The dynamic linker will use the .dynsym entry to
2309 determine the address it must put in the global offset table, so
2310 both the dynamic object and the regular object will refer to the
2311 same memory location for the variable. */
2312
2313 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2314 copy the initial value out of the dynamic object and into the
2315 runtime process image. */
2316 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2317 {
2318 htab->srelbss->size += sizeof (Elf32_External_Rel);
2319 h->needs_copy = 1;
2320 }
2321
2322 s = htab->sdynbss;
2323
2324 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2325 }
2326
2327 /* Allocate space in .plt, .got and associated reloc sections for
2328 dynamic relocs. */
2329
2330 static bfd_boolean
2331 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2332 {
2333 struct bfd_link_info *info;
2334 struct elf_i386_link_hash_table *htab;
2335 struct elf_i386_link_hash_entry *eh;
2336 struct elf_dyn_relocs *p;
2337 unsigned plt_entry_size;
2338
2339 if (h->root.type == bfd_link_hash_indirect)
2340 return TRUE;
2341
2342 eh = (struct elf_i386_link_hash_entry *) h;
2343
2344 info = (struct bfd_link_info *) inf;
2345 htab = elf_i386_hash_table (info);
2346 if (htab == NULL)
2347 return FALSE;
2348
2349 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2350
2351 /* Clear the reference count of function pointer relocations if
2352 symbol isn't a normal function. */
2353 if (h->type != STT_FUNC)
2354 eh->func_pointer_refcount = 0;
2355
2356 /* We can't use the GOT PLT if pointer equality is needed since
2357 finish_dynamic_symbol won't clear symbol value and the dynamic
2358 linker won't update the GOT slot. We will get into an infinite
2359 loop at run-time. */
2360 if (htab->plt_got != NULL
2361 && h->type != STT_GNU_IFUNC
2362 && !h->pointer_equality_needed
2363 && h->plt.refcount > 0
2364 && h->got.refcount > 0)
2365 {
2366 /* Don't use the regular PLT if there are both GOT and GOTPLT
2367 reloctions. */
2368 h->plt.offset = (bfd_vma) -1;
2369
2370 /* Use the GOT PLT. */
2371 eh->plt_got.refcount = 1;
2372 }
2373
2374 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2375 here if it is defined and referenced in a non-shared object. */
2376 if (h->type == STT_GNU_IFUNC
2377 && h->def_regular)
2378 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2379 plt_entry_size,
2380 plt_entry_size, 4);
2381 /* Don't create the PLT entry if there are only function pointer
2382 relocations which can be resolved at run-time. */
2383 else if (htab->elf.dynamic_sections_created
2384 && (h->plt.refcount > eh->func_pointer_refcount
2385 || eh->plt_got.refcount > 0))
2386 {
2387 bfd_boolean use_plt_got;
2388
2389 /* Clear the reference count of function pointer relocations
2390 if PLT is used. */
2391 eh->func_pointer_refcount = 0;
2392
2393 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2394 {
2395 /* Don't use the regular PLT for DF_BIND_NOW. */
2396 h->plt.offset = (bfd_vma) -1;
2397
2398 /* Use the GOT PLT. */
2399 h->got.refcount = 1;
2400 eh->plt_got.refcount = 1;
2401 }
2402
2403 use_plt_got = eh->plt_got.refcount > 0;
2404
2405 /* Make sure this symbol is output as a dynamic symbol.
2406 Undefined weak syms won't yet be marked as dynamic. */
2407 if (h->dynindx == -1
2408 && !h->forced_local)
2409 {
2410 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2411 return FALSE;
2412 }
2413
2414 if (bfd_link_pic (info)
2415 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2416 {
2417 asection *s = htab->elf.splt;
2418 asection *got_s = htab->plt_got;
2419
2420 /* If this is the first .plt entry, make room for the special
2421 first entry. The .plt section is used by prelink to undo
2422 prelinking for dynamic relocations. */
2423 if (s->size == 0)
2424 s->size = plt_entry_size;
2425
2426 if (use_plt_got)
2427 eh->plt_got.offset = got_s->size;
2428 else
2429 h->plt.offset = s->size;
2430
2431 /* If this symbol is not defined in a regular file, and we are
2432 not generating a shared library, then set the symbol to this
2433 location in the .plt. This is required to make function
2434 pointers compare as equal between the normal executable and
2435 the shared library. */
2436 if (! bfd_link_pic (info)
2437 && !h->def_regular)
2438 {
2439 if (use_plt_got)
2440 {
2441 /* We need to make a call to the entry of the GOT PLT
2442 instead of regular PLT entry. */
2443 h->root.u.def.section = got_s;
2444 h->root.u.def.value = eh->plt_got.offset;
2445 }
2446 else
2447 {
2448 h->root.u.def.section = s;
2449 h->root.u.def.value = h->plt.offset;
2450 }
2451 }
2452
2453 /* Make room for this entry. */
2454 if (use_plt_got)
2455 got_s->size += sizeof (elf_i386_got_plt_entry);
2456 else
2457 {
2458 s->size += plt_entry_size;
2459
2460 /* We also need to make an entry in the .got.plt section,
2461 which will be placed in the .got section by the linker
2462 script. */
2463 htab->elf.sgotplt->size += 4;
2464
2465 /* We also need to make an entry in the .rel.plt section. */
2466 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2467 htab->elf.srelplt->reloc_count++;
2468 }
2469
2470 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2471 && !bfd_link_pic (info))
2472 {
2473 /* VxWorks has a second set of relocations for each PLT entry
2474 in executables. They go in a separate relocation section,
2475 which is processed by the kernel loader. */
2476
2477 /* There are two relocations for the initial PLT entry: an
2478 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2479 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2480
2481 if (h->plt.offset == plt_entry_size)
2482 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2483
2484 /* There are two extra relocations for each subsequent PLT entry:
2485 an R_386_32 relocation for the GOT entry, and an R_386_32
2486 relocation for the PLT entry. */
2487
2488 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2489 }
2490 }
2491 else
2492 {
2493 h->plt.offset = (bfd_vma) -1;
2494 h->needs_plt = 0;
2495 }
2496 }
2497 else
2498 {
2499 h->plt.offset = (bfd_vma) -1;
2500 h->needs_plt = 0;
2501 }
2502
2503 eh->tlsdesc_got = (bfd_vma) -1;
2504
2505 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2506 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2507 if (h->got.refcount > 0
2508 && bfd_link_executable (info)
2509 && h->dynindx == -1
2510 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2511 h->got.offset = (bfd_vma) -1;
2512 else if (h->got.refcount > 0)
2513 {
2514 asection *s;
2515 bfd_boolean dyn;
2516 int tls_type = elf_i386_hash_entry(h)->tls_type;
2517
2518 /* Make sure this symbol is output as a dynamic symbol.
2519 Undefined weak syms won't yet be marked as dynamic. */
2520 if (h->dynindx == -1
2521 && !h->forced_local)
2522 {
2523 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2524 return FALSE;
2525 }
2526
2527 s = htab->elf.sgot;
2528 if (GOT_TLS_GDESC_P (tls_type))
2529 {
2530 eh->tlsdesc_got = htab->elf.sgotplt->size
2531 - elf_i386_compute_jump_table_size (htab);
2532 htab->elf.sgotplt->size += 8;
2533 h->got.offset = (bfd_vma) -2;
2534 }
2535 if (! GOT_TLS_GDESC_P (tls_type)
2536 || GOT_TLS_GD_P (tls_type))
2537 {
2538 h->got.offset = s->size;
2539 s->size += 4;
2540 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2541 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2542 s->size += 4;
2543 }
2544 dyn = htab->elf.dynamic_sections_created;
2545 /* R_386_TLS_IE_32 needs one dynamic relocation,
2546 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2547 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2548 need two), R_386_TLS_GD needs one if local symbol and two if
2549 global. */
2550 if (tls_type == GOT_TLS_IE_BOTH)
2551 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2552 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2553 || (tls_type & GOT_TLS_IE))
2554 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2555 else if (GOT_TLS_GD_P (tls_type))
2556 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2557 else if (! GOT_TLS_GDESC_P (tls_type)
2558 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2559 || h->root.type != bfd_link_hash_undefweak)
2560 && (bfd_link_pic (info)
2561 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2562 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2563 if (GOT_TLS_GDESC_P (tls_type))
2564 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2565 }
2566 else
2567 h->got.offset = (bfd_vma) -1;
2568
2569 if (eh->dyn_relocs == NULL)
2570 return TRUE;
2571
2572 /* In the shared -Bsymbolic case, discard space allocated for
2573 dynamic pc-relative relocs against symbols which turn out to be
2574 defined in regular objects. For the normal shared case, discard
2575 space for pc-relative relocs that have become local due to symbol
2576 visibility changes. */
2577
2578 if (bfd_link_pic (info))
2579 {
2580 /* The only reloc that uses pc_count is R_386_PC32, which will
2581 appear on a call or on something like ".long foo - .". We
2582 want calls to protected symbols to resolve directly to the
2583 function rather than going via the plt. If people want
2584 function pointer comparisons to work as expected then they
2585 should avoid writing assembly like ".long foo - .". */
2586 if (SYMBOL_CALLS_LOCAL (info, h))
2587 {
2588 struct elf_dyn_relocs **pp;
2589
2590 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2591 {
2592 p->count -= p->pc_count;
2593 p->pc_count = 0;
2594 if (p->count == 0)
2595 *pp = p->next;
2596 else
2597 pp = &p->next;
2598 }
2599 }
2600
2601 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2602 {
2603 struct elf_dyn_relocs **pp;
2604 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2605 {
2606 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2607 *pp = p->next;
2608 else
2609 pp = &p->next;
2610 }
2611 }
2612
2613 /* Also discard relocs on undefined weak syms with non-default
2614 visibility. */
2615 if (eh->dyn_relocs != NULL
2616 && h->root.type == bfd_link_hash_undefweak)
2617 {
2618 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2619 eh->dyn_relocs = NULL;
2620
2621 /* Make sure undefined weak symbols are output as a dynamic
2622 symbol in PIEs. */
2623 else if (h->dynindx == -1
2624 && !h->forced_local)
2625 {
2626 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2627 return FALSE;
2628 }
2629 }
2630 }
2631 else if (ELIMINATE_COPY_RELOCS)
2632 {
2633 /* For the non-shared case, discard space for relocs against
2634 symbols which turn out to need copy relocs or are not
2635 dynamic. Keep dynamic relocations for run-time function
2636 pointer initialization. */
2637
2638 if ((!h->non_got_ref || eh->func_pointer_refcount > 0)
2639 && ((h->def_dynamic
2640 && !h->def_regular)
2641 || (htab->elf.dynamic_sections_created
2642 && (h->root.type == bfd_link_hash_undefweak
2643 || h->root.type == bfd_link_hash_undefined))))
2644 {
2645 /* Make sure this symbol is output as a dynamic symbol.
2646 Undefined weak syms won't yet be marked as dynamic. */
2647 if (h->dynindx == -1
2648 && !h->forced_local)
2649 {
2650 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2651 return FALSE;
2652 }
2653
2654 /* If that succeeded, we know we'll be keeping all the
2655 relocs. */
2656 if (h->dynindx != -1)
2657 goto keep;
2658 }
2659
2660 eh->dyn_relocs = NULL;
2661 eh->func_pointer_refcount = 0;
2662
2663 keep: ;
2664 }
2665
2666 /* Finally, allocate space. */
2667 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2668 {
2669 asection *sreloc;
2670
2671 sreloc = elf_section_data (p->sec)->sreloc;
2672
2673 BFD_ASSERT (sreloc != NULL);
2674 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2675 }
2676
2677 return TRUE;
2678 }
2679
2680 /* Allocate space in .plt, .got and associated reloc sections for
2681 local dynamic relocs. */
2682
2683 static bfd_boolean
2684 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2685 {
2686 struct elf_link_hash_entry *h
2687 = (struct elf_link_hash_entry *) *slot;
2688
2689 if (h->type != STT_GNU_IFUNC
2690 || !h->def_regular
2691 || !h->ref_regular
2692 || !h->forced_local
2693 || h->root.type != bfd_link_hash_defined)
2694 abort ();
2695
2696 return elf_i386_allocate_dynrelocs (h, inf);
2697 }
2698
2699 /* Find any dynamic relocs that apply to read-only sections. */
2700
2701 static bfd_boolean
2702 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2703 {
2704 struct elf_i386_link_hash_entry *eh;
2705 struct elf_dyn_relocs *p;
2706
2707 /* Skip local IFUNC symbols. */
2708 if (h->forced_local && h->type == STT_GNU_IFUNC)
2709 return TRUE;
2710
2711 eh = (struct elf_i386_link_hash_entry *) h;
2712 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2713 {
2714 asection *s = p->sec->output_section;
2715
2716 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2717 {
2718 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2719
2720 info->flags |= DF_TEXTREL;
2721
2722 if ((info->warn_shared_textrel && bfd_link_pic (info))
2723 || info->error_textrel)
2724 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2725 p->sec->owner, h->root.root.string,
2726 p->sec);
2727
2728 /* Not an error, just cut short the traversal. */
2729 return FALSE;
2730 }
2731 }
2732 return TRUE;
2733 }
2734
2735 /* With the local symbol, foo, we convert
2736 mov foo@GOT[(%reg1)], %reg2
2737 to
2738 lea foo[@GOTOFF(%reg1)], %reg2
2739 and convert
2740 call/jmp *foo@GOT[(%reg)]
2741 to
2742 nop call foo/jmp foo nop
2743 When PIC is false, convert
2744 test %reg1, foo@GOT[(%reg2)]
2745 to
2746 test $foo, %reg1
2747 and convert
2748 binop foo@GOT[(%reg1)], %reg2
2749 to
2750 binop $foo, %reg2
2751 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2752 instructions. */
2753
2754 static bfd_boolean
2755 elf_i386_convert_load (bfd *abfd, asection *sec,
2756 struct bfd_link_info *link_info)
2757 {
2758 Elf_Internal_Shdr *symtab_hdr;
2759 Elf_Internal_Rela *internal_relocs;
2760 Elf_Internal_Rela *irel, *irelend;
2761 bfd_byte *contents;
2762 struct elf_i386_link_hash_table *htab;
2763 bfd_boolean changed_contents;
2764 bfd_boolean changed_relocs;
2765 bfd_signed_vma *local_got_refcounts;
2766
2767 /* Don't even try to convert non-ELF outputs. */
2768 if (!is_elf_hash_table (link_info->hash))
2769 return FALSE;
2770
2771 /* Nothing to do if there is no need or no output. */
2772 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2773 || sec->need_convert_load == 0
2774 || bfd_is_abs_section (sec->output_section))
2775 return TRUE;
2776
2777 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2778
2779 /* Load the relocations for this section. */
2780 internal_relocs = (_bfd_elf_link_read_relocs
2781 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2782 link_info->keep_memory));
2783 if (internal_relocs == NULL)
2784 return FALSE;
2785
2786 htab = elf_i386_hash_table (link_info);
2787 changed_contents = FALSE;
2788 changed_relocs = FALSE;
2789 local_got_refcounts = elf_local_got_refcounts (abfd);
2790
2791 /* Get the section contents. */
2792 if (elf_section_data (sec)->this_hdr.contents != NULL)
2793 contents = elf_section_data (sec)->this_hdr.contents;
2794 else
2795 {
2796 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2797 goto error_return;
2798 }
2799
2800 irelend = internal_relocs + sec->reloc_count;
2801 for (irel = internal_relocs; irel < irelend; irel++)
2802 {
2803 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2804 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2805 unsigned int indx;
2806 struct elf_link_hash_entry *h;
2807 unsigned int opcode;
2808 unsigned int modrm;
2809 bfd_vma roff;
2810 bfd_boolean baseless;
2811 Elf_Internal_Sym *isym;
2812 unsigned int addend;
2813 unsigned int nop;
2814 bfd_vma nop_offset;
2815
2816 if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
2817 continue;
2818
2819 roff = irel->r_offset;
2820 if (roff < 2)
2821 continue;
2822
2823 modrm = bfd_get_8 (abfd, contents + roff - 1);
2824 baseless = (modrm & 0xc7) == 0x5;
2825
2826 if (r_type == R_386_GOT32X
2827 && baseless
2828 && bfd_link_pic (link_info))
2829 {
2830 /* For PIC, disallow R_386_GOT32X without a base register
2831 since we don't know what the GOT base is. Allow
2832 R_386_GOT32 for existing object files. */
2833 const char *name;
2834
2835 if (r_symndx < symtab_hdr->sh_info)
2836 {
2837 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
2838 r_symndx);
2839 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2840 }
2841 else
2842 {
2843 indx = r_symndx - symtab_hdr->sh_info;
2844 h = elf_sym_hashes (abfd)[indx];
2845 BFD_ASSERT (h != NULL);
2846 name = h->root.root.string;
2847 }
2848
2849 (*_bfd_error_handler)
2850 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
2851 abfd, name);
2852 goto error_return;
2853 }
2854
2855 opcode = bfd_get_8 (abfd, contents + roff - 2);
2856
2857 /* It is OK to convert mov to lea. */
2858 if (opcode != 0x8b)
2859 {
2860 /* Only convert R_386_GOT32X relocation for call, jmp or
2861 one of adc, add, and, cmp, or, sbb, sub, test, xor
2862 instructions. */
2863 if (r_type != R_386_GOT32X)
2864 continue;
2865
2866 /* It is OK to convert indirect branch to direct branch. It
2867 is OK to convert adc, add, and, cmp, or, sbb, sub, test,
2868 xor only when PIC is false. */
2869 if (opcode != 0xff && bfd_link_pic (link_info))
2870 continue;
2871 }
2872
2873 /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
2874 referred to by the reloc. */
2875 if (r_symndx < symtab_hdr->sh_info)
2876 {
2877 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2878 abfd, r_symndx);
2879
2880 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2881 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2882 continue;
2883
2884 h = NULL;
2885 if (opcode == 0x0ff)
2886 /* Convert "call/jmp *foo@GOT[(%reg)]". */
2887 goto convert_branch;
2888 else
2889 /* Convert "mov foo@GOT[(%reg1)], %reg2",
2890 "test %reg1, foo@GOT(%reg2)" and
2891 "binop foo@GOT[(%reg1)], %reg2". */
2892 goto convert_load;
2893 }
2894
2895 indx = r_symndx - symtab_hdr->sh_info;
2896 h = elf_sym_hashes (abfd)[indx];
2897 BFD_ASSERT (h != NULL);
2898
2899 while (h->root.type == bfd_link_hash_indirect
2900 || h->root.type == bfd_link_hash_warning)
2901 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2902
2903 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2904 if (h->type == STT_GNU_IFUNC)
2905 continue;
2906
2907 if (opcode == 0xff)
2908 {
2909 /* We have "call/jmp *foo@GOT[(%reg)]". */
2910 if ((h->root.type == bfd_link_hash_defined
2911 || h->root.type == bfd_link_hash_defweak)
2912 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2913 {
2914 /* The function is locally defined. */
2915 convert_branch:
2916 addend = bfd_get_32 (abfd, contents + roff);
2917 /* Addend for R_386_GOT32X relocation must be 0. */
2918 if (addend != 0)
2919 continue;
2920
2921 /* Convert R_386_GOT32X to R_386_PC32. */
2922 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
2923 {
2924 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2925 is a nop prefix. */
2926 modrm = 0xe8;
2927 nop = link_info->call_nop_byte;
2928 if (link_info->call_nop_as_suffix)
2929 {
2930 nop_offset = roff + 3;
2931 irel->r_offset -= 1;
2932 }
2933 else
2934 nop_offset = roff - 2;
2935 }
2936 else
2937 {
2938 /* Convert to "jmp foo nop". */
2939 modrm = 0xe9;
2940 nop = NOP_OPCODE;
2941 nop_offset = roff + 3;
2942 irel->r_offset -= 1;
2943 }
2944
2945 bfd_put_8 (abfd, nop, contents + nop_offset);
2946 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2947 /* When converting to PC-relative relocation, we
2948 need to adjust addend by -4. */
2949 bfd_put_32 (abfd, -4, contents + irel->r_offset);
2950 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
2951
2952 if (h)
2953 {
2954 if (h->got.refcount > 0)
2955 h->got.refcount -= 1;
2956 }
2957 else
2958 {
2959 if (local_got_refcounts != NULL
2960 && local_got_refcounts[r_symndx] > 0)
2961 local_got_refcounts[r_symndx] -= 1;
2962 }
2963
2964 changed_contents = TRUE;
2965 changed_relocs = TRUE;
2966 }
2967 }
2968 else
2969 {
2970 /* We have "mov foo@GOT[(%re1g)], %reg2",
2971 "test %reg1, foo@GOT(%reg2)" and
2972 "binop foo@GOT[(%reg1)], %reg2".
2973
2974 Avoid optimizing _DYNAMIC since ld.so may use its
2975 link-time address. */
2976 if (h == htab->elf.hdynamic)
2977 continue;
2978
2979 if ((h->root.type == bfd_link_hash_defined
2980 || h->root.type == bfd_link_hash_defweak)
2981 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2982 {
2983 convert_load:
2984 if (opcode == 0x8b)
2985 {
2986 /* Convert "mov foo@GOT(%reg1), %reg2" to
2987 "lea foo@GOTOFF(%reg1), %reg2". */
2988 if (r_type == R_386_GOT32X
2989 && (baseless || !bfd_link_pic (link_info)))
2990 {
2991 r_type = R_386_32;
2992 /* For R_386_32, convert
2993 "lea foo@GOTOFF(%reg1), %reg2" to
2994 "lea foo@GOT, %reg2". */
2995 if (!baseless)
2996 {
2997 modrm = 0x5 | (modrm & 0x38);
2998 bfd_put_8 (abfd, modrm, contents + roff - 1);
2999 }
3000 }
3001 else
3002 r_type = R_386_GOTOFF;
3003 opcode = 0x8d;
3004 }
3005 else
3006 {
3007 /* Addend for R_386_GOT32X relocation must be 0. */
3008 addend = bfd_get_32 (abfd, contents + roff);
3009 if (addend != 0)
3010 continue;
3011
3012 if (opcode == 0x85)
3013 {
3014 /* Convert "test %reg1, foo@GOT(%reg2)" to
3015 "test $foo, %reg1". */
3016 modrm = 0xc0 | (modrm & 0x38) >> 3;
3017 opcode = 0xf7;
3018 }
3019 else
3020 {
3021 /* Convert "binop foo@GOT(%reg1), %reg2" to
3022 "binop $foo, %reg2". */
3023 modrm = (0xc0
3024 | (modrm & 0x38) >> 3
3025 | (opcode & 0x3c));
3026 opcode = 0x81;
3027 }
3028 bfd_put_8 (abfd, modrm, contents + roff - 1);
3029 r_type = R_386_32;
3030 }
3031
3032 bfd_put_8 (abfd, opcode, contents + roff - 2);
3033 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
3034
3035 if (h)
3036 {
3037 if (h->got.refcount > 0)
3038 h->got.refcount -= 1;
3039 }
3040 else
3041 {
3042 if (local_got_refcounts != NULL
3043 && local_got_refcounts[r_symndx] > 0)
3044 local_got_refcounts[r_symndx] -= 1;
3045 }
3046
3047 changed_contents = TRUE;
3048 changed_relocs = TRUE;
3049 }
3050 }
3051 }
3052
3053 if (contents != NULL
3054 && elf_section_data (sec)->this_hdr.contents != contents)
3055 {
3056 if (!changed_contents && !link_info->keep_memory)
3057 free (contents);
3058 else
3059 {
3060 /* Cache the section contents for elf_link_input_bfd. */
3061 elf_section_data (sec)->this_hdr.contents = contents;
3062 }
3063 }
3064
3065 if (elf_section_data (sec)->relocs != internal_relocs)
3066 {
3067 if (!changed_relocs)
3068 free (internal_relocs);
3069 else
3070 elf_section_data (sec)->relocs = internal_relocs;
3071 }
3072
3073 return TRUE;
3074
3075 error_return:
3076 if (contents != NULL
3077 && elf_section_data (sec)->this_hdr.contents != contents)
3078 free (contents);
3079 if (internal_relocs != NULL
3080 && elf_section_data (sec)->relocs != internal_relocs)
3081 free (internal_relocs);
3082 return FALSE;
3083 }
3084
3085 /* Set the sizes of the dynamic sections. */
3086
3087 static bfd_boolean
3088 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3089 {
3090 struct elf_i386_link_hash_table *htab;
3091 bfd *dynobj;
3092 asection *s;
3093 bfd_boolean relocs;
3094 bfd *ibfd;
3095
3096 htab = elf_i386_hash_table (info);
3097 if (htab == NULL)
3098 return FALSE;
3099 dynobj = htab->elf.dynobj;
3100 if (dynobj == NULL)
3101 abort ();
3102
3103 if (htab->elf.dynamic_sections_created)
3104 {
3105 /* Set the contents of the .interp section to the interpreter. */
3106 if (bfd_link_executable (info) && !info->nointerp)
3107 {
3108 s = bfd_get_linker_section (dynobj, ".interp");
3109 if (s == NULL)
3110 abort ();
3111 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
3112 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3113 }
3114 }
3115
3116 /* Set up .got offsets for local syms, and space for local dynamic
3117 relocs. */
3118 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3119 {
3120 bfd_signed_vma *local_got;
3121 bfd_signed_vma *end_local_got;
3122 char *local_tls_type;
3123 bfd_vma *local_tlsdesc_gotent;
3124 bfd_size_type locsymcount;
3125 Elf_Internal_Shdr *symtab_hdr;
3126 asection *srel;
3127
3128 if (! is_i386_elf (ibfd))
3129 continue;
3130
3131 for (s = ibfd->sections; s != NULL; s = s->next)
3132 {
3133 struct elf_dyn_relocs *p;
3134
3135 if (!elf_i386_convert_load (ibfd, s, info))
3136 return FALSE;
3137
3138 for (p = ((struct elf_dyn_relocs *)
3139 elf_section_data (s)->local_dynrel);
3140 p != NULL;
3141 p = p->next)
3142 {
3143 if (!bfd_is_abs_section (p->sec)
3144 && bfd_is_abs_section (p->sec->output_section))
3145 {
3146 /* Input section has been discarded, either because
3147 it is a copy of a linkonce section or due to
3148 linker script /DISCARD/, so we'll be discarding
3149 the relocs too. */
3150 }
3151 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3152 && strcmp (p->sec->output_section->name,
3153 ".tls_vars") == 0)
3154 {
3155 /* Relocations in vxworks .tls_vars sections are
3156 handled specially by the loader. */
3157 }
3158 else if (p->count != 0)
3159 {
3160 srel = elf_section_data (p->sec)->sreloc;
3161 srel->size += p->count * sizeof (Elf32_External_Rel);
3162 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3163 && (info->flags & DF_TEXTREL) == 0)
3164 {
3165 info->flags |= DF_TEXTREL;
3166 if ((info->warn_shared_textrel && bfd_link_pic (info))
3167 || info->error_textrel)
3168 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3169 p->sec->owner, p->sec);
3170 }
3171 }
3172 }
3173 }
3174
3175 local_got = elf_local_got_refcounts (ibfd);
3176 if (!local_got)
3177 continue;
3178
3179 symtab_hdr = &elf_symtab_hdr (ibfd);
3180 locsymcount = symtab_hdr->sh_info;
3181 end_local_got = local_got + locsymcount;
3182 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3183 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3184 s = htab->elf.sgot;
3185 srel = htab->elf.srelgot;
3186 for (; local_got < end_local_got;
3187 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3188 {
3189 *local_tlsdesc_gotent = (bfd_vma) -1;
3190 if (*local_got > 0)
3191 {
3192 if (GOT_TLS_GDESC_P (*local_tls_type))
3193 {
3194 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3195 - elf_i386_compute_jump_table_size (htab);
3196 htab->elf.sgotplt->size += 8;
3197 *local_got = (bfd_vma) -2;
3198 }
3199 if (! GOT_TLS_GDESC_P (*local_tls_type)
3200 || GOT_TLS_GD_P (*local_tls_type))
3201 {
3202 *local_got = s->size;
3203 s->size += 4;
3204 if (GOT_TLS_GD_P (*local_tls_type)
3205 || *local_tls_type == GOT_TLS_IE_BOTH)
3206 s->size += 4;
3207 }
3208 if (bfd_link_pic (info)
3209 || GOT_TLS_GD_ANY_P (*local_tls_type)
3210 || (*local_tls_type & GOT_TLS_IE))
3211 {
3212 if (*local_tls_type == GOT_TLS_IE_BOTH)
3213 srel->size += 2 * sizeof (Elf32_External_Rel);
3214 else if (GOT_TLS_GD_P (*local_tls_type)
3215 || ! GOT_TLS_GDESC_P (*local_tls_type))
3216 srel->size += sizeof (Elf32_External_Rel);
3217 if (GOT_TLS_GDESC_P (*local_tls_type))
3218 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3219 }
3220 }
3221 else
3222 *local_got = (bfd_vma) -1;
3223 }
3224 }
3225
3226 if (htab->tls_ldm_got.refcount > 0)
3227 {
3228 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3229 relocs. */
3230 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3231 htab->elf.sgot->size += 8;
3232 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3233 }
3234 else
3235 htab->tls_ldm_got.offset = -1;
3236
3237 /* Allocate global sym .plt and .got entries, and space for global
3238 sym dynamic relocs. */
3239 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3240
3241 /* Allocate .plt and .got entries, and space for local symbols. */
3242 htab_traverse (htab->loc_hash_table,
3243 elf_i386_allocate_local_dynrelocs,
3244 info);
3245
3246 /* For every jump slot reserved in the sgotplt, reloc_count is
3247 incremented. However, when we reserve space for TLS descriptors,
3248 it's not incremented, so in order to compute the space reserved
3249 for them, it suffices to multiply the reloc count by the jump
3250 slot size.
3251
3252 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3253 so that R_386_IRELATIVE entries come last. */
3254 if (htab->elf.srelplt)
3255 {
3256 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3257 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3258 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3259 }
3260 else if (htab->elf.irelplt)
3261 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3262
3263
3264 if (htab->elf.sgotplt)
3265 {
3266 /* Don't allocate .got.plt section if there are no GOT nor PLT
3267 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3268 if ((htab->elf.hgot == NULL
3269 || !htab->elf.hgot->ref_regular_nonweak)
3270 && (htab->elf.sgotplt->size
3271 == get_elf_backend_data (output_bfd)->got_header_size)
3272 && (htab->elf.splt == NULL
3273 || htab->elf.splt->size == 0)
3274 && (htab->elf.sgot == NULL
3275 || htab->elf.sgot->size == 0)
3276 && (htab->elf.iplt == NULL
3277 || htab->elf.iplt->size == 0)
3278 && (htab->elf.igotplt == NULL
3279 || htab->elf.igotplt->size == 0))
3280 htab->elf.sgotplt->size = 0;
3281 }
3282
3283
3284 if (htab->plt_eh_frame != NULL
3285 && htab->elf.splt != NULL
3286 && htab->elf.splt->size != 0
3287 && !bfd_is_abs_section (htab->elf.splt->output_section)
3288 && _bfd_elf_eh_frame_present (info))
3289 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3290
3291 /* We now have determined the sizes of the various dynamic sections.
3292 Allocate memory for them. */
3293 relocs = FALSE;
3294 for (s = dynobj->sections; s != NULL; s = s->next)
3295 {
3296 bfd_boolean strip_section = TRUE;
3297
3298 if ((s->flags & SEC_LINKER_CREATED) == 0)
3299 continue;
3300
3301 if (s == htab->elf.splt
3302 || s == htab->elf.sgot)
3303 {
3304 /* Strip this section if we don't need it; see the
3305 comment below. */
3306 /* We'd like to strip these sections if they aren't needed, but if
3307 we've exported dynamic symbols from them we must leave them.
3308 It's too late to tell BFD to get rid of the symbols. */
3309
3310 if (htab->elf.hplt != NULL)
3311 strip_section = FALSE;
3312 }
3313 else if (s == htab->elf.sgotplt
3314 || s == htab->elf.iplt
3315 || s == htab->elf.igotplt
3316 || s == htab->plt_got
3317 || s == htab->plt_eh_frame
3318 || s == htab->sdynbss)
3319 {
3320 /* Strip these too. */
3321 }
3322 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3323 {
3324 if (s->size != 0
3325 && s != htab->elf.srelplt
3326 && s != htab->srelplt2)
3327 relocs = TRUE;
3328
3329 /* We use the reloc_count field as a counter if we need
3330 to copy relocs into the output file. */
3331 s->reloc_count = 0;
3332 }
3333 else
3334 {
3335 /* It's not one of our sections, so don't allocate space. */
3336 continue;
3337 }
3338
3339 if (s->size == 0)
3340 {
3341 /* If we don't need this section, strip it from the
3342 output file. This is mostly to handle .rel.bss and
3343 .rel.plt. We must create both sections in
3344 create_dynamic_sections, because they must be created
3345 before the linker maps input sections to output
3346 sections. The linker does that before
3347 adjust_dynamic_symbol is called, and it is that
3348 function which decides whether anything needs to go
3349 into these sections. */
3350 if (strip_section)
3351 s->flags |= SEC_EXCLUDE;
3352 continue;
3353 }
3354
3355 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3356 continue;
3357
3358 /* Allocate memory for the section contents. We use bfd_zalloc
3359 here in case unused entries are not reclaimed before the
3360 section's contents are written out. This should not happen,
3361 but this way if it does, we get a R_386_NONE reloc instead
3362 of garbage. */
3363 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3364 if (s->contents == NULL)
3365 return FALSE;
3366 }
3367
3368 if (htab->plt_eh_frame != NULL
3369 && htab->plt_eh_frame->contents != NULL)
3370 {
3371 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3372 sizeof (elf_i386_eh_frame_plt));
3373 bfd_put_32 (dynobj, htab->elf.splt->size,
3374 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3375 }
3376
3377 if (htab->elf.dynamic_sections_created)
3378 {
3379 /* Add some entries to the .dynamic section. We fill in the
3380 values later, in elf_i386_finish_dynamic_sections, but we
3381 must add the entries now so that we get the correct size for
3382 the .dynamic section. The DT_DEBUG entry is filled in by the
3383 dynamic linker and used by the debugger. */
3384 #define add_dynamic_entry(TAG, VAL) \
3385 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3386
3387 if (bfd_link_executable (info))
3388 {
3389 if (!add_dynamic_entry (DT_DEBUG, 0))
3390 return FALSE;
3391 }
3392
3393 if (htab->elf.splt->size != 0)
3394 {
3395 /* DT_PLTGOT is used by prelink even if there is no PLT
3396 relocation. */
3397 if (!add_dynamic_entry (DT_PLTGOT, 0))
3398 return FALSE;
3399
3400 if (htab->elf.srelplt->size != 0)
3401 {
3402 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3403 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3404 || !add_dynamic_entry (DT_JMPREL, 0))
3405 return FALSE;
3406 }
3407 }
3408
3409 if (relocs)
3410 {
3411 if (!add_dynamic_entry (DT_REL, 0)
3412 || !add_dynamic_entry (DT_RELSZ, 0)
3413 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3414 return FALSE;
3415
3416 /* If any dynamic relocs apply to a read-only section,
3417 then we need a DT_TEXTREL entry. */
3418 if ((info->flags & DF_TEXTREL) == 0)
3419 elf_link_hash_traverse (&htab->elf,
3420 elf_i386_readonly_dynrelocs, info);
3421
3422 if ((info->flags & DF_TEXTREL) != 0)
3423 {
3424 if ((elf_tdata (output_bfd)->has_gnu_symbols
3425 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3426 {
3427 info->callbacks->einfo
3428 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3429 bfd_set_error (bfd_error_bad_value);
3430 return FALSE;
3431 }
3432
3433 if (!add_dynamic_entry (DT_TEXTREL, 0))
3434 return FALSE;
3435 }
3436 }
3437 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3438 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3439 return FALSE;
3440 }
3441 #undef add_dynamic_entry
3442
3443 return TRUE;
3444 }
3445
3446 static bfd_boolean
3447 elf_i386_always_size_sections (bfd *output_bfd,
3448 struct bfd_link_info *info)
3449 {
3450 asection *tls_sec = elf_hash_table (info)->tls_sec;
3451
3452 if (tls_sec)
3453 {
3454 struct elf_link_hash_entry *tlsbase;
3455
3456 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3457 "_TLS_MODULE_BASE_",
3458 FALSE, FALSE, FALSE);
3459
3460 if (tlsbase && tlsbase->type == STT_TLS)
3461 {
3462 struct elf_i386_link_hash_table *htab;
3463 struct bfd_link_hash_entry *bh = NULL;
3464 const struct elf_backend_data *bed
3465 = get_elf_backend_data (output_bfd);
3466
3467 htab = elf_i386_hash_table (info);
3468 if (htab == NULL)
3469 return FALSE;
3470
3471 if (!(_bfd_generic_link_add_one_symbol
3472 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3473 tls_sec, 0, NULL, FALSE,
3474 bed->collect, &bh)))
3475 return FALSE;
3476
3477 htab->tls_module_base = bh;
3478
3479 tlsbase = (struct elf_link_hash_entry *)bh;
3480 tlsbase->def_regular = 1;
3481 tlsbase->other = STV_HIDDEN;
3482 tlsbase->root.linker_def = 1;
3483 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3484 }
3485 }
3486
3487 return TRUE;
3488 }
3489
3490 /* Set the correct type for an x86 ELF section. We do this by the
3491 section name, which is a hack, but ought to work. */
3492
3493 static bfd_boolean
3494 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3495 Elf_Internal_Shdr *hdr,
3496 asection *sec)
3497 {
3498 const char *name;
3499
3500 name = bfd_get_section_name (abfd, sec);
3501
3502 /* This is an ugly, but unfortunately necessary hack that is
3503 needed when producing EFI binaries on x86. It tells
3504 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3505 containing ELF relocation info. We need this hack in order to
3506 be able to generate ELF binaries that can be translated into
3507 EFI applications (which are essentially COFF objects). Those
3508 files contain a COFF ".reloc" section inside an ELFNN object,
3509 which would normally cause BFD to segfault because it would
3510 attempt to interpret this section as containing relocation
3511 entries for section "oc". With this hack enabled, ".reloc"
3512 will be treated as a normal data section, which will avoid the
3513 segfault. However, you won't be able to create an ELFNN binary
3514 with a section named "oc" that needs relocations, but that's
3515 the kind of ugly side-effects you get when detecting section
3516 types based on their names... In practice, this limitation is
3517 unlikely to bite. */
3518 if (strcmp (name, ".reloc") == 0)
3519 hdr->sh_type = SHT_PROGBITS;
3520
3521 return TRUE;
3522 }
3523
3524 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3525 executables. Rather than setting it to the beginning of the TLS
3526 section, we have to set it to the end. This function may be called
3527 multiple times, it is idempotent. */
3528
3529 static void
3530 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3531 {
3532 struct elf_i386_link_hash_table *htab;
3533 struct bfd_link_hash_entry *base;
3534
3535 if (!bfd_link_executable (info))
3536 return;
3537
3538 htab = elf_i386_hash_table (info);
3539 if (htab == NULL)
3540 return;
3541
3542 base = htab->tls_module_base;
3543 if (base == NULL)
3544 return;
3545
3546 base->u.def.value = htab->elf.tls_size;
3547 }
3548
3549 /* Return the base VMA address which should be subtracted from real addresses
3550 when resolving @dtpoff relocation.
3551 This is PT_TLS segment p_vaddr. */
3552
3553 static bfd_vma
3554 elf_i386_dtpoff_base (struct bfd_link_info *info)
3555 {
3556 /* If tls_sec is NULL, we should have signalled an error already. */
3557 if (elf_hash_table (info)->tls_sec == NULL)
3558 return 0;
3559 return elf_hash_table (info)->tls_sec->vma;
3560 }
3561
3562 /* Return the relocation value for @tpoff relocation
3563 if STT_TLS virtual address is ADDRESS. */
3564
3565 static bfd_vma
3566 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3567 {
3568 struct elf_link_hash_table *htab = elf_hash_table (info);
3569 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3570 bfd_vma static_tls_size;
3571
3572 /* If tls_sec is NULL, we should have signalled an error already. */
3573 if (htab->tls_sec == NULL)
3574 return 0;
3575
3576 /* Consider special static TLS alignment requirements. */
3577 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3578 return static_tls_size + htab->tls_sec->vma - address;
3579 }
3580
3581 /* Relocate an i386 ELF section. */
3582
3583 static bfd_boolean
3584 elf_i386_relocate_section (bfd *output_bfd,
3585 struct bfd_link_info *info,
3586 bfd *input_bfd,
3587 asection *input_section,
3588 bfd_byte *contents,
3589 Elf_Internal_Rela *relocs,
3590 Elf_Internal_Sym *local_syms,
3591 asection **local_sections)
3592 {
3593 struct elf_i386_link_hash_table *htab;
3594 Elf_Internal_Shdr *symtab_hdr;
3595 struct elf_link_hash_entry **sym_hashes;
3596 bfd_vma *local_got_offsets;
3597 bfd_vma *local_tlsdesc_gotents;
3598 Elf_Internal_Rela *rel;
3599 Elf_Internal_Rela *relend;
3600 bfd_boolean is_vxworks_tls;
3601 unsigned plt_entry_size;
3602
3603 BFD_ASSERT (is_i386_elf (input_bfd));
3604
3605 htab = elf_i386_hash_table (info);
3606 if (htab == NULL)
3607 return FALSE;
3608 symtab_hdr = &elf_symtab_hdr (input_bfd);
3609 sym_hashes = elf_sym_hashes (input_bfd);
3610 local_got_offsets = elf_local_got_offsets (input_bfd);
3611 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3612 /* We have to handle relocations in vxworks .tls_vars sections
3613 specially, because the dynamic loader is 'weird'. */
3614 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3615 && bfd_link_pic (info)
3616 && !strcmp (input_section->output_section->name,
3617 ".tls_vars"));
3618
3619 elf_i386_set_tls_module_base (info);
3620
3621 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3622
3623 rel = relocs;
3624 relend = relocs + input_section->reloc_count;
3625 for (; rel < relend; rel++)
3626 {
3627 unsigned int r_type;
3628 reloc_howto_type *howto;
3629 unsigned long r_symndx;
3630 struct elf_link_hash_entry *h;
3631 struct elf_i386_link_hash_entry *eh;
3632 Elf_Internal_Sym *sym;
3633 asection *sec;
3634 bfd_vma off, offplt, plt_offset;
3635 bfd_vma relocation;
3636 bfd_boolean unresolved_reloc;
3637 bfd_reloc_status_type r;
3638 unsigned int indx;
3639 int tls_type;
3640 bfd_vma st_size;
3641 asection *resolved_plt;
3642
3643 r_type = ELF32_R_TYPE (rel->r_info);
3644 if (r_type == R_386_GNU_VTINHERIT
3645 || r_type == R_386_GNU_VTENTRY)
3646 continue;
3647
3648 if ((indx = r_type) >= R_386_standard
3649 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3650 >= R_386_ext - R_386_standard)
3651 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3652 >= R_386_ext2 - R_386_ext))
3653 {
3654 (*_bfd_error_handler)
3655 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3656 input_bfd, input_section, r_type);
3657 bfd_set_error (bfd_error_bad_value);
3658 return FALSE;
3659 }
3660 howto = elf_howto_table + indx;
3661
3662 r_symndx = ELF32_R_SYM (rel->r_info);
3663 h = NULL;
3664 sym = NULL;
3665 sec = NULL;
3666 unresolved_reloc = FALSE;
3667 if (r_symndx < symtab_hdr->sh_info)
3668 {
3669 sym = local_syms + r_symndx;
3670 sec = local_sections[r_symndx];
3671 relocation = (sec->output_section->vma
3672 + sec->output_offset
3673 + sym->st_value);
3674 st_size = sym->st_size;
3675
3676 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3677 && ((sec->flags & SEC_MERGE) != 0
3678 || (bfd_link_relocatable (info)
3679 && sec->output_offset != 0)))
3680 {
3681 bfd_vma addend;
3682 bfd_byte *where = contents + rel->r_offset;
3683
3684 switch (howto->size)
3685 {
3686 case 0:
3687 addend = bfd_get_8 (input_bfd, where);
3688 if (howto->pc_relative)
3689 {
3690 addend = (addend ^ 0x80) - 0x80;
3691 addend += 1;
3692 }
3693 break;
3694 case 1:
3695 addend = bfd_get_16 (input_bfd, where);
3696 if (howto->pc_relative)
3697 {
3698 addend = (addend ^ 0x8000) - 0x8000;
3699 addend += 2;
3700 }
3701 break;
3702 case 2:
3703 addend = bfd_get_32 (input_bfd, where);
3704 if (howto->pc_relative)
3705 {
3706 addend = (addend ^ 0x80000000) - 0x80000000;
3707 addend += 4;
3708 }
3709 break;
3710 default:
3711 abort ();
3712 }
3713
3714 if (bfd_link_relocatable (info))
3715 addend += sec->output_offset;
3716 else
3717 {
3718 asection *msec = sec;
3719 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3720 addend);
3721 addend -= relocation;
3722 addend += msec->output_section->vma + msec->output_offset;
3723 }
3724
3725 switch (howto->size)
3726 {
3727 case 0:
3728 /* FIXME: overflow checks. */
3729 if (howto->pc_relative)
3730 addend -= 1;
3731 bfd_put_8 (input_bfd, addend, where);
3732 break;
3733 case 1:
3734 if (howto->pc_relative)
3735 addend -= 2;
3736 bfd_put_16 (input_bfd, addend, where);
3737 break;
3738 case 2:
3739 if (howto->pc_relative)
3740 addend -= 4;
3741 bfd_put_32 (input_bfd, addend, where);
3742 break;
3743 }
3744 }
3745 else if (!bfd_link_relocatable (info)
3746 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3747 {
3748 /* Relocate against local STT_GNU_IFUNC symbol. */
3749 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3750 FALSE);
3751 if (h == NULL)
3752 abort ();
3753
3754 /* Set STT_GNU_IFUNC symbol value. */
3755 h->root.u.def.value = sym->st_value;
3756 h->root.u.def.section = sec;
3757 }
3758 }
3759 else
3760 {
3761 bfd_boolean warned ATTRIBUTE_UNUSED;
3762 bfd_boolean ignored ATTRIBUTE_UNUSED;
3763
3764 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3765 r_symndx, symtab_hdr, sym_hashes,
3766 h, sec, relocation,
3767 unresolved_reloc, warned, ignored);
3768 st_size = h->size;
3769 }
3770
3771 if (sec != NULL && discarded_section (sec))
3772 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3773 rel, 1, relend, howto, 0, contents);
3774
3775 if (bfd_link_relocatable (info))
3776 continue;
3777
3778 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3779 it here if it is defined in a non-shared object. */
3780 if (h != NULL
3781 && h->type == STT_GNU_IFUNC
3782 && h->def_regular)
3783 {
3784 asection *plt, *gotplt, *base_got;
3785 bfd_vma plt_index;
3786 const char *name;
3787
3788 if ((input_section->flags & SEC_ALLOC) == 0)
3789 {
3790 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3791 sections because such sections are not SEC_ALLOC and
3792 thus ld.so will not process them. */
3793 if ((input_section->flags & SEC_DEBUGGING) != 0)
3794 continue;
3795 abort ();
3796 }
3797 else if (h->plt.offset == (bfd_vma) -1)
3798 abort ();
3799
3800 /* STT_GNU_IFUNC symbol must go through PLT. */
3801 if (htab->elf.splt != NULL)
3802 {
3803 plt = htab->elf.splt;
3804 gotplt = htab->elf.sgotplt;
3805 }
3806 else
3807 {
3808 plt = htab->elf.iplt;
3809 gotplt = htab->elf.igotplt;
3810 }
3811
3812 relocation = (plt->output_section->vma
3813 + plt->output_offset + h->plt.offset);
3814
3815 switch (r_type)
3816 {
3817 default:
3818 if (h->root.root.string)
3819 name = h->root.root.string;
3820 else
3821 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3822 NULL);
3823 (*_bfd_error_handler)
3824 (_("%B: relocation %s against STT_GNU_IFUNC "
3825 "symbol `%s' isn't handled by %s"), input_bfd,
3826 elf_howto_table[r_type].name,
3827 name, __FUNCTION__);
3828 bfd_set_error (bfd_error_bad_value);
3829 return FALSE;
3830
3831 case R_386_32:
3832 /* Generate dynamic relcoation only when there is a
3833 non-GOT reference in a shared object. */
3834 if (bfd_link_pic (info) && h->non_got_ref)
3835 {
3836 Elf_Internal_Rela outrel;
3837 asection *sreloc;
3838 bfd_vma offset;
3839
3840 /* Need a dynamic relocation to get the real function
3841 adddress. */
3842 offset = _bfd_elf_section_offset (output_bfd,
3843 info,
3844 input_section,
3845 rel->r_offset);
3846 if (offset == (bfd_vma) -1
3847 || offset == (bfd_vma) -2)
3848 abort ();
3849
3850 outrel.r_offset = (input_section->output_section->vma
3851 + input_section->output_offset
3852 + offset);
3853
3854 if (h->dynindx == -1
3855 || h->forced_local
3856 || bfd_link_executable (info))
3857 {
3858 /* This symbol is resolved locally. */
3859 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3860 bfd_put_32 (output_bfd,
3861 (h->root.u.def.value
3862 + h->root.u.def.section->output_section->vma
3863 + h->root.u.def.section->output_offset),
3864 contents + offset);
3865 }
3866 else
3867 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3868
3869 sreloc = htab->elf.irelifunc;
3870 elf_append_rel (output_bfd, sreloc, &outrel);
3871
3872 /* If this reloc is against an external symbol, we
3873 do not want to fiddle with the addend. Otherwise,
3874 we need to include the symbol value so that it
3875 becomes an addend for the dynamic reloc. For an
3876 internal symbol, we have updated addend. */
3877 continue;
3878 }
3879 /* FALLTHROUGH */
3880 case R_386_PC32:
3881 case R_386_PLT32:
3882 goto do_relocation;
3883
3884 case R_386_GOT32:
3885 case R_386_GOT32X:
3886 base_got = htab->elf.sgot;
3887 off = h->got.offset;
3888
3889 if (base_got == NULL)
3890 abort ();
3891
3892 if (off == (bfd_vma) -1)
3893 {
3894 /* We can't use h->got.offset here to save state, or
3895 even just remember the offset, as finish_dynamic_symbol
3896 would use that as offset into .got. */
3897
3898 if (htab->elf.splt != NULL)
3899 {
3900 plt_index = h->plt.offset / plt_entry_size - 1;
3901 off = (plt_index + 3) * 4;
3902 base_got = htab->elf.sgotplt;
3903 }
3904 else
3905 {
3906 plt_index = h->plt.offset / plt_entry_size;
3907 off = plt_index * 4;
3908 base_got = htab->elf.igotplt;
3909 }
3910
3911 if (h->dynindx == -1
3912 || h->forced_local
3913 || info->symbolic)
3914 {
3915 /* This references the local defitionion. We must
3916 initialize this entry in the global offset table.
3917 Since the offset must always be a multiple of 8,
3918 we use the least significant bit to record
3919 whether we have initialized it already.
3920
3921 When doing a dynamic link, we create a .rela.got
3922 relocation entry to initialize the value. This
3923 is done in the finish_dynamic_symbol routine. */
3924 if ((off & 1) != 0)
3925 off &= ~1;
3926 else
3927 {
3928 bfd_put_32 (output_bfd, relocation,
3929 base_got->contents + off);
3930 h->got.offset |= 1;
3931 }
3932 }
3933
3934 relocation = off;
3935
3936 /* Adjust for static executables. */
3937 if (htab->elf.splt == NULL)
3938 relocation += gotplt->output_offset;
3939 }
3940 else
3941 {
3942 relocation = (base_got->output_section->vma
3943 + base_got->output_offset + off
3944 - gotplt->output_section->vma
3945 - gotplt->output_offset);
3946 /* Adjust for static executables. */
3947 if (htab->elf.splt == NULL)
3948 relocation += gotplt->output_offset;
3949 }
3950
3951 goto do_relocation;
3952
3953 case R_386_GOTOFF:
3954 relocation -= (gotplt->output_section->vma
3955 + gotplt->output_offset);
3956 goto do_relocation;
3957 }
3958 }
3959
3960 eh = (struct elf_i386_link_hash_entry *) h;
3961 switch (r_type)
3962 {
3963 case R_386_GOT32X:
3964 /* Avoid optimizing _DYNAMIC since ld.so may use its
3965 link-time address. */
3966 if (h == htab->elf.hdynamic)
3967 goto r_386_got32;
3968
3969 if (bfd_link_pic (info))
3970 {
3971 /* It is OK to convert mov to lea and convert indirect
3972 branch to direct branch. It is OK to convert adc,
3973 add, and, cmp, or, sbb, sub, test, xor only when PIC
3974 is false. */
3975 unsigned int opcode;
3976 opcode = bfd_get_8 (abfd, contents + rel->r_offset - 2);
3977 if (opcode != 0x8b && opcode != 0xff)
3978 goto r_386_got32;
3979 }
3980
3981 /* Resolve "mov GOT[(%reg)], %reg",
3982 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
3983 and "binop foo@GOT[(%reg)], %reg". */
3984 if (h == NULL
3985 || (h->plt.offset == (bfd_vma) -1
3986 && h->got.offset == (bfd_vma) -1)
3987 || htab->elf.sgotplt == NULL)
3988 abort ();
3989
3990 offplt = (htab->elf.sgotplt->output_section->vma
3991 + htab->elf.sgotplt->output_offset);
3992
3993 /* It is relative to .got.plt section. */
3994 if (h->got.offset != (bfd_vma) -1)
3995 /* Use GOT entry. */
3996 relocation = (htab->elf.sgot->output_section->vma
3997 + htab->elf.sgot->output_offset
3998 + h->got.offset - offplt);
3999 else
4000 /* Use GOTPLT entry. */
4001 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4002
4003 if (!bfd_link_pic (info))
4004 {
4005 /* If not PIC, add the .got.plt section address for
4006 baseless adressing. */
4007 unsigned int modrm;
4008 modrm = bfd_get_8 (abfd, contents + rel->r_offset - 1);
4009 if ((modrm & 0xc7) == 0x5)
4010 relocation += offplt;
4011 }
4012
4013 unresolved_reloc = FALSE;
4014 break;
4015
4016 case R_386_GOT32:
4017 r_386_got32:
4018 /* Relocation is to the entry for this symbol in the global
4019 offset table. */
4020 if (htab->elf.sgot == NULL)
4021 abort ();
4022
4023 if (h != NULL)
4024 {
4025 bfd_boolean dyn;
4026
4027 off = h->got.offset;
4028 dyn = htab->elf.dynamic_sections_created;
4029 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4030 bfd_link_pic (info),
4031 h)
4032 || (bfd_link_pic (info)
4033 && SYMBOL_REFERENCES_LOCAL (info, h))
4034 || (ELF_ST_VISIBILITY (h->other)
4035 && h->root.type == bfd_link_hash_undefweak))
4036 {
4037 /* This is actually a static link, or it is a
4038 -Bsymbolic link and the symbol is defined
4039 locally, or the symbol was forced to be local
4040 because of a version file. We must initialize
4041 this entry in the global offset table. Since the
4042 offset must always be a multiple of 4, we use the
4043 least significant bit to record whether we have
4044 initialized it already.
4045
4046 When doing a dynamic link, we create a .rel.got
4047 relocation entry to initialize the value. This
4048 is done in the finish_dynamic_symbol routine. */
4049 if ((off & 1) != 0)
4050 off &= ~1;
4051 else
4052 {
4053 bfd_put_32 (output_bfd, relocation,
4054 htab->elf.sgot->contents + off);
4055 h->got.offset |= 1;
4056 }
4057 }
4058 else
4059 unresolved_reloc = FALSE;
4060 }
4061 else
4062 {
4063 if (local_got_offsets == NULL)
4064 abort ();
4065
4066 off = local_got_offsets[r_symndx];
4067
4068 /* The offset must always be a multiple of 4. We use
4069 the least significant bit to record whether we have
4070 already generated the necessary reloc. */
4071 if ((off & 1) != 0)
4072 off &= ~1;
4073 else
4074 {
4075 bfd_put_32 (output_bfd, relocation,
4076 htab->elf.sgot->contents + off);
4077
4078 if (bfd_link_pic (info))
4079 {
4080 asection *s;
4081 Elf_Internal_Rela outrel;
4082
4083 s = htab->elf.srelgot;
4084 if (s == NULL)
4085 abort ();
4086
4087 outrel.r_offset = (htab->elf.sgot->output_section->vma
4088 + htab->elf.sgot->output_offset
4089 + off);
4090 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4091 elf_append_rel (output_bfd, s, &outrel);
4092 }
4093
4094 local_got_offsets[r_symndx] |= 1;
4095 }
4096 }
4097
4098 if (off >= (bfd_vma) -2)
4099 abort ();
4100
4101 relocation = htab->elf.sgot->output_section->vma
4102 + htab->elf.sgot->output_offset + off
4103 - htab->elf.sgotplt->output_section->vma
4104 - htab->elf.sgotplt->output_offset;
4105 break;
4106
4107 case R_386_GOTOFF:
4108 /* Relocation is relative to the start of the global offset
4109 table. */
4110
4111 /* Check to make sure it isn't a protected function or data
4112 symbol for shared library since it may not be local when
4113 used as function address or with copy relocation. We also
4114 need to make sure that a symbol is referenced locally. */
4115 if (!bfd_link_executable (info) && h)
4116 {
4117 if (!h->def_regular)
4118 {
4119 const char *v;
4120
4121 switch (ELF_ST_VISIBILITY (h->other))
4122 {
4123 case STV_HIDDEN:
4124 v = _("hidden symbol");
4125 break;
4126 case STV_INTERNAL:
4127 v = _("internal symbol");
4128 break;
4129 case STV_PROTECTED:
4130 v = _("protected symbol");
4131 break;
4132 default:
4133 v = _("symbol");
4134 break;
4135 }
4136
4137 (*_bfd_error_handler)
4138 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4139 input_bfd, v, h->root.root.string);
4140 bfd_set_error (bfd_error_bad_value);
4141 return FALSE;
4142 }
4143 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4144 && (h->type == STT_FUNC
4145 || h->type == STT_OBJECT)
4146 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4147 {
4148 (*_bfd_error_handler)
4149 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4150 input_bfd,
4151 h->type == STT_FUNC ? "function" : "data",
4152 h->root.root.string);
4153 bfd_set_error (bfd_error_bad_value);
4154 return FALSE;
4155 }
4156 }
4157
4158 /* Note that sgot is not involved in this
4159 calculation. We always want the start of .got.plt. If we
4160 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4161 permitted by the ABI, we might have to change this
4162 calculation. */
4163 relocation -= htab->elf.sgotplt->output_section->vma
4164 + htab->elf.sgotplt->output_offset;
4165 break;
4166
4167 case R_386_GOTPC:
4168 /* Use global offset table as symbol value. */
4169 relocation = htab->elf.sgotplt->output_section->vma
4170 + htab->elf.sgotplt->output_offset;
4171 unresolved_reloc = FALSE;
4172 break;
4173
4174 case R_386_PLT32:
4175 /* Relocation is to the entry for this symbol in the
4176 procedure linkage table. */
4177
4178 /* Resolve a PLT32 reloc against a local symbol directly,
4179 without using the procedure linkage table. */
4180 if (h == NULL)
4181 break;
4182
4183 if ((h->plt.offset == (bfd_vma) -1
4184 && eh->plt_got.offset == (bfd_vma) -1)
4185 || htab->elf.splt == NULL)
4186 {
4187 /* We didn't make a PLT entry for this symbol. This
4188 happens when statically linking PIC code, or when
4189 using -Bsymbolic. */
4190 break;
4191 }
4192
4193 if (h->plt.offset != (bfd_vma) -1)
4194 {
4195 resolved_plt = htab->elf.splt;
4196 plt_offset = h->plt.offset;
4197 }
4198 else
4199 {
4200 resolved_plt = htab->plt_got;
4201 plt_offset = eh->plt_got.offset;
4202 }
4203
4204 relocation = (resolved_plt->output_section->vma
4205 + resolved_plt->output_offset
4206 + plt_offset);
4207 unresolved_reloc = FALSE;
4208 break;
4209
4210 case R_386_SIZE32:
4211 /* Set to symbol size. */
4212 relocation = st_size;
4213 /* Fall through. */
4214
4215 case R_386_32:
4216 case R_386_PC32:
4217 if ((input_section->flags & SEC_ALLOC) == 0
4218 || is_vxworks_tls)
4219 break;
4220
4221 /* Copy dynamic function pointer relocations. */
4222 if ((bfd_link_pic (info)
4223 && (h == NULL
4224 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4225 || h->root.type != bfd_link_hash_undefweak)
4226 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4227 || !SYMBOL_CALLS_LOCAL (info, h)))
4228 || (ELIMINATE_COPY_RELOCS
4229 && !bfd_link_pic (info)
4230 && h != NULL
4231 && h->dynindx != -1
4232 && (!h->non_got_ref || eh->func_pointer_refcount > 0)
4233 && ((h->def_dynamic
4234 && !h->def_regular)
4235 || h->root.type == bfd_link_hash_undefweak
4236 || h->root.type == bfd_link_hash_undefined)))
4237 {
4238 Elf_Internal_Rela outrel;
4239 bfd_boolean skip, relocate;
4240 asection *sreloc;
4241
4242 /* When generating a shared object, these relocations
4243 are copied into the output file to be resolved at run
4244 time. */
4245
4246 skip = FALSE;
4247 relocate = FALSE;
4248
4249 outrel.r_offset =
4250 _bfd_elf_section_offset (output_bfd, info, input_section,
4251 rel->r_offset);
4252 if (outrel.r_offset == (bfd_vma) -1)
4253 skip = TRUE;
4254 else if (outrel.r_offset == (bfd_vma) -2)
4255 skip = TRUE, relocate = TRUE;
4256 outrel.r_offset += (input_section->output_section->vma
4257 + input_section->output_offset);
4258
4259 if (skip)
4260 memset (&outrel, 0, sizeof outrel);
4261 else if (h != NULL
4262 && h->dynindx != -1
4263 && (r_type == R_386_PC32
4264 || !bfd_link_pic (info)
4265 || !SYMBOLIC_BIND (info, h)
4266 || !h->def_regular))
4267 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4268 else
4269 {
4270 /* This symbol is local, or marked to become local. */
4271 relocate = TRUE;
4272 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4273 }
4274
4275 sreloc = elf_section_data (input_section)->sreloc;
4276
4277 if (sreloc == NULL || sreloc->contents == NULL)
4278 {
4279 r = bfd_reloc_notsupported;
4280 goto check_relocation_error;
4281 }
4282
4283 elf_append_rel (output_bfd, sreloc, &outrel);
4284
4285 /* If this reloc is against an external symbol, we do
4286 not want to fiddle with the addend. Otherwise, we
4287 need to include the symbol value so that it becomes
4288 an addend for the dynamic reloc. */
4289 if (! relocate)
4290 continue;
4291 }
4292 break;
4293
4294 case R_386_TLS_IE:
4295 if (!bfd_link_executable (info))
4296 {
4297 Elf_Internal_Rela outrel;
4298 asection *sreloc;
4299
4300 outrel.r_offset = rel->r_offset
4301 + input_section->output_section->vma
4302 + input_section->output_offset;
4303 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4304 sreloc = elf_section_data (input_section)->sreloc;
4305 if (sreloc == NULL)
4306 abort ();
4307 elf_append_rel (output_bfd, sreloc, &outrel);
4308 }
4309 /* Fall through */
4310
4311 case R_386_TLS_GD:
4312 case R_386_TLS_GOTDESC:
4313 case R_386_TLS_DESC_CALL:
4314 case R_386_TLS_IE_32:
4315 case R_386_TLS_GOTIE:
4316 tls_type = GOT_UNKNOWN;
4317 if (h == NULL && local_got_offsets)
4318 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4319 else if (h != NULL)
4320 tls_type = elf_i386_hash_entry(h)->tls_type;
4321 if (tls_type == GOT_TLS_IE)
4322 tls_type = GOT_TLS_IE_NEG;
4323
4324 if (! elf_i386_tls_transition (info, input_bfd,
4325 input_section, contents,
4326 symtab_hdr, sym_hashes,
4327 &r_type, tls_type, rel,
4328 relend, h, r_symndx))
4329 return FALSE;
4330
4331 if (r_type == R_386_TLS_LE_32)
4332 {
4333 BFD_ASSERT (! unresolved_reloc);
4334 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4335 {
4336 unsigned int type;
4337 bfd_vma roff;
4338
4339 /* GD->LE transition. */
4340 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4341 if (type == 0x04)
4342 {
4343 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4344 Change it into:
4345 movl %gs:0, %eax; subl $foo@tpoff, %eax
4346 (6 byte form of subl). */
4347 memcpy (contents + rel->r_offset - 3,
4348 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4349 roff = rel->r_offset + 5;
4350 }
4351 else
4352 {
4353 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4354 Change it into:
4355 movl %gs:0, %eax; subl $foo@tpoff, %eax
4356 (6 byte form of subl). */
4357 memcpy (contents + rel->r_offset - 2,
4358 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4359 roff = rel->r_offset + 6;
4360 }
4361 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4362 contents + roff);
4363 /* Skip R_386_PC32/R_386_PLT32. */
4364 rel++;
4365 continue;
4366 }
4367 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4368 {
4369 /* GDesc -> LE transition.
4370 It's originally something like:
4371 leal x@tlsdesc(%ebx), %eax
4372
4373 leal x@ntpoff, %eax
4374
4375 Registers other than %eax may be set up here. */
4376
4377 unsigned int val;
4378 bfd_vma roff;
4379
4380 roff = rel->r_offset;
4381 val = bfd_get_8 (input_bfd, contents + roff - 1);
4382
4383 /* Now modify the instruction as appropriate. */
4384 /* aoliva FIXME: remove the above and xor the byte
4385 below with 0x86. */
4386 bfd_put_8 (output_bfd, val ^ 0x86,
4387 contents + roff - 1);
4388 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4389 contents + roff);
4390 continue;
4391 }
4392 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4393 {
4394 /* GDesc -> LE transition.
4395 It's originally:
4396 call *(%eax)
4397 Turn it into:
4398 xchg %ax,%ax */
4399
4400 bfd_vma roff;
4401
4402 roff = rel->r_offset;
4403 bfd_put_8 (output_bfd, 0x66, contents + roff);
4404 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4405 continue;
4406 }
4407 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4408 {
4409 unsigned int val;
4410
4411 /* IE->LE transition:
4412 Originally it can be one of:
4413 movl foo, %eax
4414 movl foo, %reg
4415 addl foo, %reg
4416 We change it into:
4417 movl $foo, %eax
4418 movl $foo, %reg
4419 addl $foo, %reg. */
4420 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4421 if (val == 0xa1)
4422 {
4423 /* movl foo, %eax. */
4424 bfd_put_8 (output_bfd, 0xb8,
4425 contents + rel->r_offset - 1);
4426 }
4427 else
4428 {
4429 unsigned int type;
4430
4431 type = bfd_get_8 (input_bfd,
4432 contents + rel->r_offset - 2);
4433 switch (type)
4434 {
4435 case 0x8b:
4436 /* movl */
4437 bfd_put_8 (output_bfd, 0xc7,
4438 contents + rel->r_offset - 2);
4439 bfd_put_8 (output_bfd,
4440 0xc0 | ((val >> 3) & 7),
4441 contents + rel->r_offset - 1);
4442 break;
4443 case 0x03:
4444 /* addl */
4445 bfd_put_8 (output_bfd, 0x81,
4446 contents + rel->r_offset - 2);
4447 bfd_put_8 (output_bfd,
4448 0xc0 | ((val >> 3) & 7),
4449 contents + rel->r_offset - 1);
4450 break;
4451 default:
4452 BFD_FAIL ();
4453 break;
4454 }
4455 }
4456 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4457 contents + rel->r_offset);
4458 continue;
4459 }
4460 else
4461 {
4462 unsigned int val, type;
4463
4464 /* {IE_32,GOTIE}->LE transition:
4465 Originally it can be one of:
4466 subl foo(%reg1), %reg2
4467 movl foo(%reg1), %reg2
4468 addl foo(%reg1), %reg2
4469 We change it into:
4470 subl $foo, %reg2
4471 movl $foo, %reg2 (6 byte form)
4472 addl $foo, %reg2. */
4473 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4474 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4475 if (type == 0x8b)
4476 {
4477 /* movl */
4478 bfd_put_8 (output_bfd, 0xc7,
4479 contents + rel->r_offset - 2);
4480 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4481 contents + rel->r_offset - 1);
4482 }
4483 else if (type == 0x2b)
4484 {
4485 /* subl */
4486 bfd_put_8 (output_bfd, 0x81,
4487 contents + rel->r_offset - 2);
4488 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4489 contents + rel->r_offset - 1);
4490 }
4491 else if (type == 0x03)
4492 {
4493 /* addl */
4494 bfd_put_8 (output_bfd, 0x81,
4495 contents + rel->r_offset - 2);
4496 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4497 contents + rel->r_offset - 1);
4498 }
4499 else
4500 BFD_FAIL ();
4501 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4502 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4503 contents + rel->r_offset);
4504 else
4505 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4506 contents + rel->r_offset);
4507 continue;
4508 }
4509 }
4510
4511 if (htab->elf.sgot == NULL)
4512 abort ();
4513
4514 if (h != NULL)
4515 {
4516 off = h->got.offset;
4517 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4518 }
4519 else
4520 {
4521 if (local_got_offsets == NULL)
4522 abort ();
4523
4524 off = local_got_offsets[r_symndx];
4525 offplt = local_tlsdesc_gotents[r_symndx];
4526 }
4527
4528 if ((off & 1) != 0)
4529 off &= ~1;
4530 else
4531 {
4532 Elf_Internal_Rela outrel;
4533 int dr_type;
4534 asection *sreloc;
4535
4536 if (htab->elf.srelgot == NULL)
4537 abort ();
4538
4539 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4540
4541 if (GOT_TLS_GDESC_P (tls_type))
4542 {
4543 bfd_byte *loc;
4544 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4545 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4546 <= htab->elf.sgotplt->size);
4547 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4548 + htab->elf.sgotplt->output_offset
4549 + offplt
4550 + htab->sgotplt_jump_table_size);
4551 sreloc = htab->elf.srelplt;
4552 loc = sreloc->contents;
4553 loc += (htab->next_tls_desc_index++
4554 * sizeof (Elf32_External_Rel));
4555 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4556 <= sreloc->contents + sreloc->size);
4557 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4558 if (indx == 0)
4559 {
4560 BFD_ASSERT (! unresolved_reloc);
4561 bfd_put_32 (output_bfd,
4562 relocation - elf_i386_dtpoff_base (info),
4563 htab->elf.sgotplt->contents + offplt
4564 + htab->sgotplt_jump_table_size + 4);
4565 }
4566 else
4567 {
4568 bfd_put_32 (output_bfd, 0,
4569 htab->elf.sgotplt->contents + offplt
4570 + htab->sgotplt_jump_table_size + 4);
4571 }
4572 }
4573
4574 sreloc = htab->elf.srelgot;
4575
4576 outrel.r_offset = (htab->elf.sgot->output_section->vma
4577 + htab->elf.sgot->output_offset + off);
4578
4579 if (GOT_TLS_GD_P (tls_type))
4580 dr_type = R_386_TLS_DTPMOD32;
4581 else if (GOT_TLS_GDESC_P (tls_type))
4582 goto dr_done;
4583 else if (tls_type == GOT_TLS_IE_POS)
4584 dr_type = R_386_TLS_TPOFF;
4585 else
4586 dr_type = R_386_TLS_TPOFF32;
4587
4588 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4589 bfd_put_32 (output_bfd,
4590 relocation - elf_i386_dtpoff_base (info),
4591 htab->elf.sgot->contents + off);
4592 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4593 bfd_put_32 (output_bfd,
4594 elf_i386_dtpoff_base (info) - relocation,
4595 htab->elf.sgot->contents + off);
4596 else if (dr_type != R_386_TLS_DESC)
4597 bfd_put_32 (output_bfd, 0,
4598 htab->elf.sgot->contents + off);
4599 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4600
4601 elf_append_rel (output_bfd, sreloc, &outrel);
4602
4603 if (GOT_TLS_GD_P (tls_type))
4604 {
4605 if (indx == 0)
4606 {
4607 BFD_ASSERT (! unresolved_reloc);
4608 bfd_put_32 (output_bfd,
4609 relocation - elf_i386_dtpoff_base (info),
4610 htab->elf.sgot->contents + off + 4);
4611 }
4612 else
4613 {
4614 bfd_put_32 (output_bfd, 0,
4615 htab->elf.sgot->contents + off + 4);
4616 outrel.r_info = ELF32_R_INFO (indx,
4617 R_386_TLS_DTPOFF32);
4618 outrel.r_offset += 4;
4619 elf_append_rel (output_bfd, sreloc, &outrel);
4620 }
4621 }
4622 else if (tls_type == GOT_TLS_IE_BOTH)
4623 {
4624 bfd_put_32 (output_bfd,
4625 (indx == 0
4626 ? relocation - elf_i386_dtpoff_base (info)
4627 : 0),
4628 htab->elf.sgot->contents + off + 4);
4629 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4630 outrel.r_offset += 4;
4631 elf_append_rel (output_bfd, sreloc, &outrel);
4632 }
4633
4634 dr_done:
4635 if (h != NULL)
4636 h->got.offset |= 1;
4637 else
4638 local_got_offsets[r_symndx] |= 1;
4639 }
4640
4641 if (off >= (bfd_vma) -2
4642 && ! GOT_TLS_GDESC_P (tls_type))
4643 abort ();
4644 if (r_type == R_386_TLS_GOTDESC
4645 || r_type == R_386_TLS_DESC_CALL)
4646 {
4647 relocation = htab->sgotplt_jump_table_size + offplt;
4648 unresolved_reloc = FALSE;
4649 }
4650 else if (r_type == ELF32_R_TYPE (rel->r_info))
4651 {
4652 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4653 + htab->elf.sgotplt->output_offset;
4654 relocation = htab->elf.sgot->output_section->vma
4655 + htab->elf.sgot->output_offset + off - g_o_t;
4656 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4657 && tls_type == GOT_TLS_IE_BOTH)
4658 relocation += 4;
4659 if (r_type == R_386_TLS_IE)
4660 relocation += g_o_t;
4661 unresolved_reloc = FALSE;
4662 }
4663 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4664 {
4665 unsigned int val, type;
4666 bfd_vma roff;
4667
4668 /* GD->IE transition. */
4669 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4670 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4671 if (type == 0x04)
4672 {
4673 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4674 Change it into:
4675 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4676 val >>= 3;
4677 roff = rel->r_offset - 3;
4678 }
4679 else
4680 {
4681 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4682 Change it into:
4683 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4684 roff = rel->r_offset - 2;
4685 }
4686 memcpy (contents + roff,
4687 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4688 contents[roff + 7] = 0x80 | (val & 7);
4689 /* If foo is used only with foo@gotntpoff(%reg) and
4690 foo@indntpoff, but not with foo@gottpoff(%reg), change
4691 subl $foo@gottpoff(%reg), %eax
4692 into:
4693 addl $foo@gotntpoff(%reg), %eax. */
4694 if (tls_type == GOT_TLS_IE_POS)
4695 contents[roff + 6] = 0x03;
4696 bfd_put_32 (output_bfd,
4697 htab->elf.sgot->output_section->vma
4698 + htab->elf.sgot->output_offset + off
4699 - htab->elf.sgotplt->output_section->vma
4700 - htab->elf.sgotplt->output_offset,
4701 contents + roff + 8);
4702 /* Skip R_386_PLT32. */
4703 rel++;
4704 continue;
4705 }
4706 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4707 {
4708 /* GDesc -> IE transition.
4709 It's originally something like:
4710 leal x@tlsdesc(%ebx), %eax
4711
4712 Change it to:
4713 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4714 or:
4715 movl x@gottpoff(%ebx), %eax # before negl %eax
4716
4717 Registers other than %eax may be set up here. */
4718
4719 bfd_vma roff;
4720
4721 /* First, make sure it's a leal adding ebx to a 32-bit
4722 offset into any register, although it's probably
4723 almost always going to be eax. */
4724 roff = rel->r_offset;
4725
4726 /* Now modify the instruction as appropriate. */
4727 /* To turn a leal into a movl in the form we use it, it
4728 suffices to change the first byte from 0x8d to 0x8b.
4729 aoliva FIXME: should we decide to keep the leal, all
4730 we have to do is remove the statement below, and
4731 adjust the relaxation of R_386_TLS_DESC_CALL. */
4732 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4733
4734 if (tls_type == GOT_TLS_IE_BOTH)
4735 off += 4;
4736
4737 bfd_put_32 (output_bfd,
4738 htab->elf.sgot->output_section->vma
4739 + htab->elf.sgot->output_offset + off
4740 - htab->elf.sgotplt->output_section->vma
4741 - htab->elf.sgotplt->output_offset,
4742 contents + roff);
4743 continue;
4744 }
4745 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4746 {
4747 /* GDesc -> IE transition.
4748 It's originally:
4749 call *(%eax)
4750
4751 Change it to:
4752 xchg %ax,%ax
4753 or
4754 negl %eax
4755 depending on how we transformed the TLS_GOTDESC above.
4756 */
4757
4758 bfd_vma roff;
4759
4760 roff = rel->r_offset;
4761
4762 /* Now modify the instruction as appropriate. */
4763 if (tls_type != GOT_TLS_IE_NEG)
4764 {
4765 /* xchg %ax,%ax */
4766 bfd_put_8 (output_bfd, 0x66, contents + roff);
4767 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4768 }
4769 else
4770 {
4771 /* negl %eax */
4772 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4773 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4774 }
4775
4776 continue;
4777 }
4778 else
4779 BFD_ASSERT (FALSE);
4780 break;
4781
4782 case R_386_TLS_LDM:
4783 if (! elf_i386_tls_transition (info, input_bfd,
4784 input_section, contents,
4785 symtab_hdr, sym_hashes,
4786 &r_type, GOT_UNKNOWN, rel,
4787 relend, h, r_symndx))
4788 return FALSE;
4789
4790 if (r_type != R_386_TLS_LDM)
4791 {
4792 /* LD->LE transition:
4793 leal foo(%reg), %eax; call ___tls_get_addr.
4794 We change it into:
4795 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4796 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4797 memcpy (contents + rel->r_offset - 2,
4798 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4799 /* Skip R_386_PC32/R_386_PLT32. */
4800 rel++;
4801 continue;
4802 }
4803
4804 if (htab->elf.sgot == NULL)
4805 abort ();
4806
4807 off = htab->tls_ldm_got.offset;
4808 if (off & 1)
4809 off &= ~1;
4810 else
4811 {
4812 Elf_Internal_Rela outrel;
4813
4814 if (htab->elf.srelgot == NULL)
4815 abort ();
4816
4817 outrel.r_offset = (htab->elf.sgot->output_section->vma
4818 + htab->elf.sgot->output_offset + off);
4819
4820 bfd_put_32 (output_bfd, 0,
4821 htab->elf.sgot->contents + off);
4822 bfd_put_32 (output_bfd, 0,
4823 htab->elf.sgot->contents + off + 4);
4824 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4825 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4826 htab->tls_ldm_got.offset |= 1;
4827 }
4828 relocation = htab->elf.sgot->output_section->vma
4829 + htab->elf.sgot->output_offset + off
4830 - htab->elf.sgotplt->output_section->vma
4831 - htab->elf.sgotplt->output_offset;
4832 unresolved_reloc = FALSE;
4833 break;
4834
4835 case R_386_TLS_LDO_32:
4836 if (!bfd_link_executable (info)
4837 || (input_section->flags & SEC_CODE) == 0)
4838 relocation -= elf_i386_dtpoff_base (info);
4839 else
4840 /* When converting LDO to LE, we must negate. */
4841 relocation = -elf_i386_tpoff (info, relocation);
4842 break;
4843
4844 case R_386_TLS_LE_32:
4845 case R_386_TLS_LE:
4846 if (!bfd_link_executable (info))
4847 {
4848 Elf_Internal_Rela outrel;
4849 asection *sreloc;
4850
4851 outrel.r_offset = rel->r_offset
4852 + input_section->output_section->vma
4853 + input_section->output_offset;
4854 if (h != NULL && h->dynindx != -1)
4855 indx = h->dynindx;
4856 else
4857 indx = 0;
4858 if (r_type == R_386_TLS_LE_32)
4859 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4860 else
4861 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4862 sreloc = elf_section_data (input_section)->sreloc;
4863 if (sreloc == NULL)
4864 abort ();
4865 elf_append_rel (output_bfd, sreloc, &outrel);
4866 if (indx)
4867 continue;
4868 else if (r_type == R_386_TLS_LE_32)
4869 relocation = elf_i386_dtpoff_base (info) - relocation;
4870 else
4871 relocation -= elf_i386_dtpoff_base (info);
4872 }
4873 else if (r_type == R_386_TLS_LE_32)
4874 relocation = elf_i386_tpoff (info, relocation);
4875 else
4876 relocation = -elf_i386_tpoff (info, relocation);
4877 break;
4878
4879 default:
4880 break;
4881 }
4882
4883 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4884 because such sections are not SEC_ALLOC and thus ld.so will
4885 not process them. */
4886 if (unresolved_reloc
4887 && !((input_section->flags & SEC_DEBUGGING) != 0
4888 && h->def_dynamic)
4889 && _bfd_elf_section_offset (output_bfd, info, input_section,
4890 rel->r_offset) != (bfd_vma) -1)
4891 {
4892 (*_bfd_error_handler)
4893 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4894 input_bfd,
4895 input_section,
4896 (long) rel->r_offset,
4897 howto->name,
4898 h->root.root.string);
4899 return FALSE;
4900 }
4901
4902 do_relocation:
4903 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4904 contents, rel->r_offset,
4905 relocation, 0);
4906
4907 check_relocation_error:
4908 if (r != bfd_reloc_ok)
4909 {
4910 const char *name;
4911
4912 if (h != NULL)
4913 name = h->root.root.string;
4914 else
4915 {
4916 name = bfd_elf_string_from_elf_section (input_bfd,
4917 symtab_hdr->sh_link,
4918 sym->st_name);
4919 if (name == NULL)
4920 return FALSE;
4921 if (*name == '\0')
4922 name = bfd_section_name (input_bfd, sec);
4923 }
4924
4925 if (r == bfd_reloc_overflow)
4926 {
4927 if (! ((*info->callbacks->reloc_overflow)
4928 (info, (h ? &h->root : NULL), name, howto->name,
4929 (bfd_vma) 0, input_bfd, input_section,
4930 rel->r_offset)))
4931 return FALSE;
4932 }
4933 else
4934 {
4935 (*_bfd_error_handler)
4936 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4937 input_bfd, input_section,
4938 (long) rel->r_offset, name, (int) r);
4939 return FALSE;
4940 }
4941 }
4942 }
4943
4944 return TRUE;
4945 }
4946
4947 /* Finish up dynamic symbol handling. We set the contents of various
4948 dynamic sections here. */
4949
4950 static bfd_boolean
4951 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4952 struct bfd_link_info *info,
4953 struct elf_link_hash_entry *h,
4954 Elf_Internal_Sym *sym)
4955 {
4956 struct elf_i386_link_hash_table *htab;
4957 unsigned plt_entry_size;
4958 const struct elf_i386_backend_data *abed;
4959 struct elf_i386_link_hash_entry *eh;
4960
4961 htab = elf_i386_hash_table (info);
4962 if (htab == NULL)
4963 return FALSE;
4964
4965 abed = get_elf_i386_backend_data (output_bfd);
4966 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4967
4968 eh = (struct elf_i386_link_hash_entry *) h;
4969
4970 if (h->plt.offset != (bfd_vma) -1)
4971 {
4972 bfd_vma plt_index;
4973 bfd_vma got_offset;
4974 Elf_Internal_Rela rel;
4975 bfd_byte *loc;
4976 asection *plt, *gotplt, *relplt;
4977
4978 /* When building a static executable, use .iplt, .igot.plt and
4979 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4980 if (htab->elf.splt != NULL)
4981 {
4982 plt = htab->elf.splt;
4983 gotplt = htab->elf.sgotplt;
4984 relplt = htab->elf.srelplt;
4985 }
4986 else
4987 {
4988 plt = htab->elf.iplt;
4989 gotplt = htab->elf.igotplt;
4990 relplt = htab->elf.irelplt;
4991 }
4992
4993 /* This symbol has an entry in the procedure linkage table. Set
4994 it up. */
4995
4996 if ((h->dynindx == -1
4997 && !((h->forced_local || bfd_link_executable (info))
4998 && h->def_regular
4999 && h->type == STT_GNU_IFUNC))
5000 || plt == NULL
5001 || gotplt == NULL
5002 || relplt == NULL)
5003 abort ();
5004
5005 /* Get the index in the procedure linkage table which
5006 corresponds to this symbol. This is the index of this symbol
5007 in all the symbols for which we are making plt entries. The
5008 first entry in the procedure linkage table is reserved.
5009
5010 Get the offset into the .got table of the entry that
5011 corresponds to this function. Each .got entry is 4 bytes.
5012 The first three are reserved.
5013
5014 For static executables, we don't reserve anything. */
5015
5016 if (plt == htab->elf.splt)
5017 {
5018 got_offset = h->plt.offset / plt_entry_size - 1;
5019 got_offset = (got_offset + 3) * 4;
5020 }
5021 else
5022 {
5023 got_offset = h->plt.offset / plt_entry_size;
5024 got_offset = got_offset * 4;
5025 }
5026
5027 /* Fill in the entry in the procedure linkage table. */
5028 if (! bfd_link_pic (info))
5029 {
5030 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5031 abed->plt->plt_entry_size);
5032 bfd_put_32 (output_bfd,
5033 (gotplt->output_section->vma
5034 + gotplt->output_offset
5035 + got_offset),
5036 plt->contents + h->plt.offset
5037 + abed->plt->plt_got_offset);
5038
5039 if (abed->is_vxworks)
5040 {
5041 int s, k, reloc_index;
5042
5043 /* Create the R_386_32 relocation referencing the GOT
5044 for this PLT entry. */
5045
5046 /* S: Current slot number (zero-based). */
5047 s = ((h->plt.offset - abed->plt->plt_entry_size)
5048 / abed->plt->plt_entry_size);
5049 /* K: Number of relocations for PLTResolve. */
5050 if (bfd_link_pic (info))
5051 k = PLTRESOLVE_RELOCS_SHLIB;
5052 else
5053 k = PLTRESOLVE_RELOCS;
5054 /* Skip the PLTresolve relocations, and the relocations for
5055 the other PLT slots. */
5056 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5057 loc = (htab->srelplt2->contents + reloc_index
5058 * sizeof (Elf32_External_Rel));
5059
5060 rel.r_offset = (htab->elf.splt->output_section->vma
5061 + htab->elf.splt->output_offset
5062 + h->plt.offset + 2),
5063 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5064 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5065
5066 /* Create the R_386_32 relocation referencing the beginning of
5067 the PLT for this GOT entry. */
5068 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5069 + htab->elf.sgotplt->output_offset
5070 + got_offset);
5071 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5072 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5073 loc + sizeof (Elf32_External_Rel));
5074 }
5075 }
5076 else
5077 {
5078 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5079 abed->plt->plt_entry_size);
5080 bfd_put_32 (output_bfd, got_offset,
5081 plt->contents + h->plt.offset
5082 + abed->plt->plt_got_offset);
5083 }
5084
5085 /* Fill in the entry in the global offset table. */
5086 bfd_put_32 (output_bfd,
5087 (plt->output_section->vma
5088 + plt->output_offset
5089 + h->plt.offset
5090 + abed->plt->plt_lazy_offset),
5091 gotplt->contents + got_offset);
5092
5093 /* Fill in the entry in the .rel.plt section. */
5094 rel.r_offset = (gotplt->output_section->vma
5095 + gotplt->output_offset
5096 + got_offset);
5097 if (h->dynindx == -1
5098 || ((bfd_link_executable (info)
5099 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5100 && h->def_regular
5101 && h->type == STT_GNU_IFUNC))
5102 {
5103 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5104 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5105 in the .got.plt section. */
5106 bfd_put_32 (output_bfd,
5107 (h->root.u.def.value
5108 + h->root.u.def.section->output_section->vma
5109 + h->root.u.def.section->output_offset),
5110 gotplt->contents + got_offset);
5111 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5112 /* R_386_IRELATIVE comes last. */
5113 plt_index = htab->next_irelative_index--;
5114 }
5115 else
5116 {
5117 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5118 plt_index = htab->next_jump_slot_index++;
5119 }
5120 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5121 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5122
5123 /* Don't fill PLT entry for static executables. */
5124 if (plt == htab->elf.splt)
5125 {
5126 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
5127 plt->contents + h->plt.offset
5128 + abed->plt->plt_reloc_offset);
5129 bfd_put_32 (output_bfd, - (h->plt.offset
5130 + abed->plt->plt_plt_offset + 4),
5131 plt->contents + h->plt.offset
5132 + abed->plt->plt_plt_offset);
5133 }
5134 }
5135 else if (eh->plt_got.offset != (bfd_vma) -1)
5136 {
5137 bfd_vma got_offset, plt_offset;
5138 asection *plt, *got, *gotplt;
5139 const bfd_byte *got_plt_entry;
5140
5141 /* Offset of displacement of the indirect jump. */
5142 bfd_vma plt_got_offset = 2;
5143
5144 /* Set the entry in the GOT procedure linkage table. */
5145 plt = htab->plt_got;
5146 got = htab->elf.sgot;
5147 gotplt = htab->elf.sgotplt;
5148 got_offset = h->got.offset;
5149
5150 if (got_offset == (bfd_vma) -1
5151 || plt == NULL
5152 || got == NULL
5153 || gotplt == NULL)
5154 abort ();
5155
5156 /* Fill in the entry in the GOT procedure linkage table. */
5157 if (! bfd_link_pic (info))
5158 {
5159 got_plt_entry = elf_i386_got_plt_entry;
5160 got_offset += got->output_section->vma + got->output_offset;
5161 }
5162 else
5163 {
5164 got_plt_entry = elf_i386_pic_got_plt_entry;
5165 got_offset += (got->output_section->vma
5166 + got->output_offset
5167 - gotplt->output_section->vma
5168 - gotplt->output_offset);
5169 }
5170
5171 plt_offset = eh->plt_got.offset;
5172 memcpy (plt->contents + plt_offset, got_plt_entry,
5173 sizeof (elf_i386_got_plt_entry));
5174 bfd_put_32 (output_bfd, got_offset,
5175 plt->contents + plt_offset + plt_got_offset);
5176 }
5177
5178 if (!h->def_regular
5179 && (h->plt.offset != (bfd_vma) -1
5180 || eh->plt_got.offset != (bfd_vma) -1))
5181 {
5182 /* Mark the symbol as undefined, rather than as defined in
5183 the .plt section. Leave the value if there were any
5184 relocations where pointer equality matters (this is a clue
5185 for the dynamic linker, to make function pointer
5186 comparisons work between an application and shared
5187 library), otherwise set it to zero. If a function is only
5188 called from a binary, there is no need to slow down
5189 shared libraries because of that. */
5190 sym->st_shndx = SHN_UNDEF;
5191 if (!h->pointer_equality_needed)
5192 sym->st_value = 0;
5193 }
5194
5195 if (h->got.offset != (bfd_vma) -1
5196 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5197 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
5198 {
5199 Elf_Internal_Rela rel;
5200
5201 /* This symbol has an entry in the global offset table. Set it
5202 up. */
5203
5204 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5205 abort ();
5206
5207 rel.r_offset = (htab->elf.sgot->output_section->vma
5208 + htab->elf.sgot->output_offset
5209 + (h->got.offset & ~(bfd_vma) 1));
5210
5211 /* If this is a static link, or it is a -Bsymbolic link and the
5212 symbol is defined locally or was forced to be local because
5213 of a version file, we just want to emit a RELATIVE reloc.
5214 The entry in the global offset table will already have been
5215 initialized in the relocate_section function. */
5216 if (h->def_regular
5217 && h->type == STT_GNU_IFUNC)
5218 {
5219 if (bfd_link_pic (info))
5220 {
5221 /* Generate R_386_GLOB_DAT. */
5222 goto do_glob_dat;
5223 }
5224 else
5225 {
5226 asection *plt;
5227
5228 if (!h->pointer_equality_needed)
5229 abort ();
5230
5231 /* For non-shared object, we can't use .got.plt, which
5232 contains the real function addres if we need pointer
5233 equality. We load the GOT entry with the PLT entry. */
5234 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5235 bfd_put_32 (output_bfd,
5236 (plt->output_section->vma
5237 + plt->output_offset + h->plt.offset),
5238 htab->elf.sgot->contents + h->got.offset);
5239 return TRUE;
5240 }
5241 }
5242 else if (bfd_link_pic (info)
5243 && SYMBOL_REFERENCES_LOCAL (info, h))
5244 {
5245 BFD_ASSERT((h->got.offset & 1) != 0);
5246 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5247 }
5248 else
5249 {
5250 BFD_ASSERT((h->got.offset & 1) == 0);
5251 do_glob_dat:
5252 bfd_put_32 (output_bfd, (bfd_vma) 0,
5253 htab->elf.sgot->contents + h->got.offset);
5254 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5255 }
5256
5257 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5258 }
5259
5260 if (h->needs_copy)
5261 {
5262 Elf_Internal_Rela rel;
5263
5264 /* This symbol needs a copy reloc. Set it up. */
5265
5266 if (h->dynindx == -1
5267 || (h->root.type != bfd_link_hash_defined
5268 && h->root.type != bfd_link_hash_defweak)
5269 || htab->srelbss == NULL)
5270 abort ();
5271
5272 rel.r_offset = (h->root.u.def.value
5273 + h->root.u.def.section->output_section->vma
5274 + h->root.u.def.section->output_offset);
5275 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5276 elf_append_rel (output_bfd, htab->srelbss, &rel);
5277 }
5278
5279 return TRUE;
5280 }
5281
5282 /* Finish up local dynamic symbol handling. We set the contents of
5283 various dynamic sections here. */
5284
5285 static bfd_boolean
5286 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5287 {
5288 struct elf_link_hash_entry *h
5289 = (struct elf_link_hash_entry *) *slot;
5290 struct bfd_link_info *info
5291 = (struct bfd_link_info *) inf;
5292
5293 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5294 h, NULL);
5295 }
5296
5297 /* Used to decide how to sort relocs in an optimal manner for the
5298 dynamic linker, before writing them out. */
5299
5300 static enum elf_reloc_type_class
5301 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5302 const asection *rel_sec ATTRIBUTE_UNUSED,
5303 const Elf_Internal_Rela *rela)
5304 {
5305 bfd *abfd = info->output_bfd;
5306 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5307 struct elf_link_hash_table *htab = elf_hash_table (info);
5308 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5309 Elf_Internal_Sym sym;
5310
5311 if (htab->dynsym == NULL
5312 || !bed->s->swap_symbol_in (abfd,
5313 (htab->dynsym->contents
5314 + r_symndx * sizeof (Elf32_External_Sym)),
5315 0, &sym))
5316 abort ();
5317
5318 /* Check relocation against STT_GNU_IFUNC symbol. */
5319 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5320 return reloc_class_ifunc;
5321
5322 switch (ELF32_R_TYPE (rela->r_info))
5323 {
5324 case R_386_RELATIVE:
5325 return reloc_class_relative;
5326 case R_386_JUMP_SLOT:
5327 return reloc_class_plt;
5328 case R_386_COPY:
5329 return reloc_class_copy;
5330 default:
5331 return reloc_class_normal;
5332 }
5333 }
5334
5335 /* Finish up the dynamic sections. */
5336
5337 static bfd_boolean
5338 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5339 struct bfd_link_info *info)
5340 {
5341 struct elf_i386_link_hash_table *htab;
5342 bfd *dynobj;
5343 asection *sdyn;
5344 const struct elf_i386_backend_data *abed;
5345
5346 htab = elf_i386_hash_table (info);
5347 if (htab == NULL)
5348 return FALSE;
5349
5350 dynobj = htab->elf.dynobj;
5351 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5352 abed = get_elf_i386_backend_data (output_bfd);
5353
5354 if (htab->elf.dynamic_sections_created)
5355 {
5356 Elf32_External_Dyn *dyncon, *dynconend;
5357
5358 if (sdyn == NULL || htab->elf.sgot == NULL)
5359 abort ();
5360
5361 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5362 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5363 for (; dyncon < dynconend; dyncon++)
5364 {
5365 Elf_Internal_Dyn dyn;
5366 asection *s;
5367
5368 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5369
5370 switch (dyn.d_tag)
5371 {
5372 default:
5373 if (abed->is_vxworks
5374 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5375 break;
5376 continue;
5377
5378 case DT_PLTGOT:
5379 s = htab->elf.sgotplt;
5380 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5381 break;
5382
5383 case DT_JMPREL:
5384 s = htab->elf.srelplt;
5385 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5386 break;
5387
5388 case DT_PLTRELSZ:
5389 s = htab->elf.srelplt;
5390 dyn.d_un.d_val = s->size;
5391 break;
5392
5393 case DT_RELSZ:
5394 /* My reading of the SVR4 ABI indicates that the
5395 procedure linkage table relocs (DT_JMPREL) should be
5396 included in the overall relocs (DT_REL). This is
5397 what Solaris does. However, UnixWare can not handle
5398 that case. Therefore, we override the DT_RELSZ entry
5399 here to make it not include the JMPREL relocs. */
5400 s = htab->elf.srelplt;
5401 if (s == NULL)
5402 continue;
5403 dyn.d_un.d_val -= s->size;
5404 break;
5405
5406 case DT_REL:
5407 /* We may not be using the standard ELF linker script.
5408 If .rel.plt is the first .rel section, we adjust
5409 DT_REL to not include it. */
5410 s = htab->elf.srelplt;
5411 if (s == NULL)
5412 continue;
5413 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5414 continue;
5415 dyn.d_un.d_ptr += s->size;
5416 break;
5417 }
5418
5419 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5420 }
5421
5422 /* Fill in the first entry in the procedure linkage table. */
5423 if (htab->elf.splt && htab->elf.splt->size > 0)
5424 {
5425 if (bfd_link_pic (info))
5426 {
5427 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5428 abed->plt->plt0_entry_size);
5429 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5430 abed->plt0_pad_byte,
5431 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5432 }
5433 else
5434 {
5435 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5436 abed->plt->plt0_entry_size);
5437 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5438 abed->plt0_pad_byte,
5439 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5440 bfd_put_32 (output_bfd,
5441 (htab->elf.sgotplt->output_section->vma
5442 + htab->elf.sgotplt->output_offset
5443 + 4),
5444 htab->elf.splt->contents
5445 + abed->plt->plt0_got1_offset);
5446 bfd_put_32 (output_bfd,
5447 (htab->elf.sgotplt->output_section->vma
5448 + htab->elf.sgotplt->output_offset
5449 + 8),
5450 htab->elf.splt->contents
5451 + abed->plt->plt0_got2_offset);
5452
5453 if (abed->is_vxworks)
5454 {
5455 Elf_Internal_Rela rel;
5456
5457 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5458 On IA32 we use REL relocations so the addend goes in
5459 the PLT directly. */
5460 rel.r_offset = (htab->elf.splt->output_section->vma
5461 + htab->elf.splt->output_offset
5462 + abed->plt->plt0_got1_offset);
5463 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5464 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5465 htab->srelplt2->contents);
5466 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5467 rel.r_offset = (htab->elf.splt->output_section->vma
5468 + htab->elf.splt->output_offset
5469 + abed->plt->plt0_got2_offset);
5470 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5471 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5472 htab->srelplt2->contents +
5473 sizeof (Elf32_External_Rel));
5474 }
5475 }
5476
5477 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5478 really seem like the right value. */
5479 elf_section_data (htab->elf.splt->output_section)
5480 ->this_hdr.sh_entsize = 4;
5481
5482 /* Correct the .rel.plt.unloaded relocations. */
5483 if (abed->is_vxworks && !bfd_link_pic (info))
5484 {
5485 int num_plts = (htab->elf.splt->size
5486 / abed->plt->plt_entry_size) - 1;
5487 unsigned char *p;
5488
5489 p = htab->srelplt2->contents;
5490 if (bfd_link_pic (info))
5491 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5492 else
5493 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5494
5495 for (; num_plts; num_plts--)
5496 {
5497 Elf_Internal_Rela rel;
5498 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5499 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5500 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5501 p += sizeof (Elf32_External_Rel);
5502
5503 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5504 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5505 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5506 p += sizeof (Elf32_External_Rel);
5507 }
5508 }
5509 }
5510 }
5511
5512 if (htab->elf.sgotplt)
5513 {
5514 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5515 {
5516 (*_bfd_error_handler)
5517 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5518 return FALSE;
5519 }
5520
5521 /* Fill in the first three entries in the global offset table. */
5522 if (htab->elf.sgotplt->size > 0)
5523 {
5524 bfd_put_32 (output_bfd,
5525 (sdyn == NULL ? 0
5526 : sdyn->output_section->vma + sdyn->output_offset),
5527 htab->elf.sgotplt->contents);
5528 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5529 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5530 }
5531
5532 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5533 }
5534
5535 /* Adjust .eh_frame for .plt section. */
5536 if (htab->plt_eh_frame != NULL
5537 && htab->plt_eh_frame->contents != NULL)
5538 {
5539 if (htab->elf.splt != NULL
5540 && htab->elf.splt->size != 0
5541 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5542 && htab->elf.splt->output_section != NULL
5543 && htab->plt_eh_frame->output_section != NULL)
5544 {
5545 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5546 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5547 + htab->plt_eh_frame->output_offset
5548 + PLT_FDE_START_OFFSET;
5549 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5550 htab->plt_eh_frame->contents
5551 + PLT_FDE_START_OFFSET);
5552 }
5553 if (htab->plt_eh_frame->sec_info_type
5554 == SEC_INFO_TYPE_EH_FRAME)
5555 {
5556 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5557 htab->plt_eh_frame,
5558 htab->plt_eh_frame->contents))
5559 return FALSE;
5560 }
5561 }
5562
5563 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5564 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5565
5566 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5567 htab_traverse (htab->loc_hash_table,
5568 elf_i386_finish_local_dynamic_symbol,
5569 info);
5570
5571 return TRUE;
5572 }
5573
5574 /* Return an array of PLT entry symbol values. */
5575
5576 static bfd_vma *
5577 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5578 asection *relplt)
5579 {
5580 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5581 arelent *p;
5582 long count, i;
5583 bfd_vma *plt_sym_val;
5584 bfd_vma plt_offset;
5585 bfd_byte *plt_contents;
5586 const struct elf_i386_backend_data *bed
5587 = get_elf_i386_backend_data (abfd);
5588 Elf_Internal_Shdr *hdr;
5589
5590 /* Get the .plt section contents. */
5591 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5592 if (plt_contents == NULL)
5593 return NULL;
5594 if (!bfd_get_section_contents (abfd, (asection *) plt,
5595 plt_contents, 0, plt->size))
5596 {
5597 bad_return:
5598 free (plt_contents);
5599 return NULL;
5600 }
5601
5602 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5603 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5604 goto bad_return;
5605
5606 hdr = &elf_section_data (relplt)->this_hdr;
5607 count = relplt->size / hdr->sh_entsize;
5608
5609 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5610 if (plt_sym_val == NULL)
5611 goto bad_return;
5612
5613 for (i = 0; i < count; i++)
5614 plt_sym_val[i] = -1;
5615
5616 plt_offset = bed->plt->plt_entry_size;
5617 p = relplt->relocation;
5618 for (i = 0; i < count; i++, p++)
5619 {
5620 long reloc_index;
5621
5622 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5623 if (p->howto == NULL)
5624 continue;
5625
5626 if (p->howto->type != R_386_JUMP_SLOT
5627 && p->howto->type != R_386_IRELATIVE)
5628 continue;
5629
5630 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5631 + bed->plt->plt_reloc_offset));
5632 reloc_index /= sizeof (Elf32_External_Rel);
5633 if (reloc_index >= count)
5634 abort ();
5635 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5636 plt_offset += bed->plt->plt_entry_size;
5637
5638 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5639 section. */
5640 if (plt_offset >= plt->size)
5641 break;
5642 }
5643
5644 free (plt_contents);
5645
5646 return plt_sym_val;
5647 }
5648
5649 /* Similar to _bfd_elf_get_synthetic_symtab. */
5650
5651 static long
5652 elf_i386_get_synthetic_symtab (bfd *abfd,
5653 long symcount,
5654 asymbol **syms,
5655 long dynsymcount,
5656 asymbol **dynsyms,
5657 asymbol **ret)
5658 {
5659 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5660 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5661 dynsymcount, dynsyms, ret,
5662 plt,
5663 elf_i386_get_plt_sym_val);
5664 }
5665
5666 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5667
5668 static bfd_boolean
5669 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5670 {
5671 if (h->plt.offset != (bfd_vma) -1
5672 && !h->def_regular
5673 && !h->pointer_equality_needed)
5674 return FALSE;
5675
5676 return _bfd_elf_hash_symbol (h);
5677 }
5678
5679 /* Hook called by the linker routine which adds symbols from an object
5680 file. */
5681
5682 static bfd_boolean
5683 elf_i386_add_symbol_hook (bfd * abfd,
5684 struct bfd_link_info * info,
5685 Elf_Internal_Sym * sym,
5686 const char ** namep ATTRIBUTE_UNUSED,
5687 flagword * flagsp ATTRIBUTE_UNUSED,
5688 asection ** secp ATTRIBUTE_UNUSED,
5689 bfd_vma * valp ATTRIBUTE_UNUSED)
5690 {
5691 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5692 && (abfd->flags & DYNAMIC) == 0
5693 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5694 elf_tdata (info->output_bfd)->has_gnu_symbols
5695 |= elf_gnu_symbol_unique;
5696
5697 return TRUE;
5698 }
5699
5700 #define TARGET_LITTLE_SYM i386_elf32_vec
5701 #define TARGET_LITTLE_NAME "elf32-i386"
5702 #define ELF_ARCH bfd_arch_i386
5703 #define ELF_TARGET_ID I386_ELF_DATA
5704 #define ELF_MACHINE_CODE EM_386
5705 #define ELF_MAXPAGESIZE 0x1000
5706
5707 #define elf_backend_can_gc_sections 1
5708 #define elf_backend_can_refcount 1
5709 #define elf_backend_want_got_plt 1
5710 #define elf_backend_plt_readonly 1
5711 #define elf_backend_want_plt_sym 0
5712 #define elf_backend_got_header_size 12
5713 #define elf_backend_plt_alignment 4
5714 #define elf_backend_extern_protected_data 1
5715
5716 /* Support RELA for objdump of prelink objects. */
5717 #define elf_info_to_howto elf_i386_info_to_howto_rel
5718 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5719
5720 #define bfd_elf32_mkobject elf_i386_mkobject
5721
5722 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5723 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5724 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5725 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5726 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5727
5728 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5729 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5730 #define elf_backend_check_relocs elf_i386_check_relocs
5731 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5732 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5733 #define elf_backend_fake_sections elf_i386_fake_sections
5734 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5735 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5736 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5737 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5738 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5739 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5740 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5741 #define elf_backend_relocate_section elf_i386_relocate_section
5742 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5743 #define elf_backend_always_size_sections elf_i386_always_size_sections
5744 #define elf_backend_omit_section_dynsym \
5745 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5746 #define elf_backend_hash_symbol elf_i386_hash_symbol
5747 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5748
5749 #include "elf32-target.h"
5750
5751 /* FreeBSD support. */
5752
5753 #undef TARGET_LITTLE_SYM
5754 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5755 #undef TARGET_LITTLE_NAME
5756 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5757 #undef ELF_OSABI
5758 #define ELF_OSABI ELFOSABI_FREEBSD
5759
5760 /* The kernel recognizes executables as valid only if they carry a
5761 "FreeBSD" label in the ELF header. So we put this label on all
5762 executables and (for simplicity) also all other object files. */
5763
5764 static void
5765 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5766 {
5767 _bfd_elf_post_process_headers (abfd, info);
5768
5769 #ifdef OLD_FREEBSD_ABI_LABEL
5770 {
5771 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5772 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5773 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5774 }
5775 #endif
5776 }
5777
5778 #undef elf_backend_post_process_headers
5779 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5780 #undef elf32_bed
5781 #define elf32_bed elf32_i386_fbsd_bed
5782
5783 #undef elf_backend_add_symbol_hook
5784
5785 #include "elf32-target.h"
5786
5787 /* Solaris 2. */
5788
5789 #undef TARGET_LITTLE_SYM
5790 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5791 #undef TARGET_LITTLE_NAME
5792 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5793
5794 #undef elf_backend_post_process_headers
5795
5796 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5797 objects won't be recognized. */
5798 #undef ELF_OSABI
5799
5800 #undef elf32_bed
5801 #define elf32_bed elf32_i386_sol2_bed
5802
5803 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5804 boundary. */
5805 #undef elf_backend_static_tls_alignment
5806 #define elf_backend_static_tls_alignment 8
5807
5808 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5809
5810 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5811 File, p.63. */
5812 #undef elf_backend_want_plt_sym
5813 #define elf_backend_want_plt_sym 1
5814
5815 #include "elf32-target.h"
5816
5817 /* Intel MCU support. */
5818
5819 static bfd_boolean
5820 elf32_iamcu_elf_object_p (bfd *abfd)
5821 {
5822 /* Set the right machine number for an IAMCU elf32 file. */
5823 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5824 return TRUE;
5825 }
5826
5827 #undef TARGET_LITTLE_SYM
5828 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5829 #undef TARGET_LITTLE_NAME
5830 #define TARGET_LITTLE_NAME "elf32-iamcu"
5831 #undef ELF_ARCH
5832 #define ELF_ARCH bfd_arch_iamcu
5833
5834 #undef ELF_MACHINE_CODE
5835 #define ELF_MACHINE_CODE EM_IAMCU
5836
5837 #undef ELF_OSABI
5838
5839 #undef elf32_bed
5840 #define elf32_bed elf32_iamcu_bed
5841
5842 #undef elf_backend_object_p
5843 #define elf_backend_object_p elf32_iamcu_elf_object_p
5844
5845 #undef elf_backend_static_tls_alignment
5846
5847 #undef elf_backend_want_plt_sym
5848 #define elf_backend_want_plt_sym 0
5849
5850 #include "elf32-target.h"
5851
5852 /* Restore defaults. */
5853 #undef ELF_ARCH
5854 #define ELF_ARCH bfd_arch_i386
5855 #undef ELF_MACHINE_CODE
5856 #define ELF_MACHINE_CODE EM_386
5857
5858 /* Native Client support. */
5859
5860 #undef TARGET_LITTLE_SYM
5861 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5862 #undef TARGET_LITTLE_NAME
5863 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5864 #undef elf32_bed
5865 #define elf32_bed elf32_i386_nacl_bed
5866
5867 #undef ELF_MAXPAGESIZE
5868 #define ELF_MAXPAGESIZE 0x10000
5869
5870 /* Restore defaults. */
5871 #undef ELF_OSABI
5872 #undef elf_backend_want_plt_sym
5873 #define elf_backend_want_plt_sym 0
5874 #undef elf_backend_post_process_headers
5875 #undef elf_backend_static_tls_alignment
5876
5877 /* NaCl uses substantially different PLT entries for the same effects. */
5878
5879 #undef elf_backend_plt_alignment
5880 #define elf_backend_plt_alignment 5
5881 #define NACL_PLT_ENTRY_SIZE 64
5882 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5883
5884 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5885 {
5886 0xff, 0x35, /* pushl contents of address */
5887 0, 0, 0, 0, /* replaced with address of .got + 4. */
5888 0x8b, 0x0d, /* movl contents of address, %ecx */
5889 0, 0, 0, 0, /* replaced with address of .got + 8. */
5890 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5891 0xff, 0xe1 /* jmp *%ecx */
5892 };
5893
5894 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5895 {
5896 0x8b, 0x0d, /* movl contents of address, %ecx */
5897 0, 0, 0, 0, /* replaced with GOT slot address. */
5898 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5899 0xff, 0xe1, /* jmp *%ecx */
5900
5901 /* Pad to the next 32-byte boundary with nop instructions. */
5902 0x90,
5903 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5904 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5905
5906 /* Lazy GOT entries point here (32-byte aligned). */
5907 0x68, /* pushl immediate */
5908 0, 0, 0, 0, /* replaced with reloc offset. */
5909 0xe9, /* jmp relative */
5910 0, 0, 0, 0, /* replaced with offset to .plt. */
5911
5912 /* Pad to the next 32-byte boundary with nop instructions. */
5913 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5914 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5915 0x90, 0x90
5916 };
5917
5918 static const bfd_byte
5919 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5920 {
5921 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5922 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5923 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5924 0xff, 0xe1, /* jmp *%ecx */
5925
5926 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5927 so pad to that size with nop instructions. */
5928 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5929 };
5930
5931 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5932 {
5933 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5934 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5935 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5936 0xff, 0xe1, /* jmp *%ecx */
5937
5938 /* Pad to the next 32-byte boundary with nop instructions. */
5939 0x90,
5940 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5941 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5942
5943 /* Lazy GOT entries point here (32-byte aligned). */
5944 0x68, /* pushl immediate */
5945 0, 0, 0, 0, /* replaced with offset into relocation table. */
5946 0xe9, /* jmp relative */
5947 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5948
5949 /* Pad to the next 32-byte boundary with nop instructions. */
5950 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5951 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5952 0x90, 0x90
5953 };
5954
5955 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5956 {
5957 #if (PLT_CIE_LENGTH != 20 \
5958 || PLT_FDE_LENGTH != 36 \
5959 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5960 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5961 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5962 #endif
5963 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5964 0, 0, 0, 0, /* CIE ID */
5965 1, /* CIE version */
5966 'z', 'R', 0, /* Augmentation string */
5967 1, /* Code alignment factor */
5968 0x7c, /* Data alignment factor: -4 */
5969 8, /* Return address column */
5970 1, /* Augmentation size */
5971 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5972 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5973 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5974 DW_CFA_nop, DW_CFA_nop,
5975
5976 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5977 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5978 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5979 0, 0, 0, 0, /* .plt size goes here */
5980 0, /* Augmentation size */
5981 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5982 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5983 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5984 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5985 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5986 13, /* Block length */
5987 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5988 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5989 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5990 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5991 DW_CFA_nop, DW_CFA_nop
5992 };
5993
5994 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5995 {
5996 elf_i386_nacl_plt0_entry, /* plt0_entry */
5997 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5998 2, /* plt0_got1_offset */
5999 8, /* plt0_got2_offset */
6000 elf_i386_nacl_plt_entry, /* plt_entry */
6001 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6002 2, /* plt_got_offset */
6003 33, /* plt_reloc_offset */
6004 38, /* plt_plt_offset */
6005 32, /* plt_lazy_offset */
6006 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6007 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6008 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6009 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6010 };
6011
6012 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6013 {
6014 &elf_i386_nacl_plt, /* plt */
6015 0x90, /* plt0_pad_byte: nop insn */
6016 0, /* is_vxworks */
6017 };
6018
6019 static bfd_boolean
6020 elf32_i386_nacl_elf_object_p (bfd *abfd)
6021 {
6022 /* Set the right machine number for a NaCl i386 ELF32 file. */
6023 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6024 return TRUE;
6025 }
6026
6027 #undef elf_backend_arch_data
6028 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6029
6030 #undef elf_backend_object_p
6031 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6032 #undef elf_backend_modify_segment_map
6033 #define elf_backend_modify_segment_map nacl_modify_segment_map
6034 #undef elf_backend_modify_program_headers
6035 #define elf_backend_modify_program_headers nacl_modify_program_headers
6036 #undef elf_backend_final_write_processing
6037 #define elf_backend_final_write_processing nacl_final_write_processing
6038
6039 #include "elf32-target.h"
6040
6041 /* Restore defaults. */
6042 #undef elf_backend_object_p
6043 #undef elf_backend_modify_segment_map
6044 #undef elf_backend_modify_program_headers
6045 #undef elf_backend_final_write_processing
6046
6047 /* VxWorks support. */
6048
6049 #undef TARGET_LITTLE_SYM
6050 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6051 #undef TARGET_LITTLE_NAME
6052 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6053 #undef ELF_OSABI
6054 #undef elf_backend_plt_alignment
6055 #define elf_backend_plt_alignment 4
6056
6057 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6058 {
6059 &elf_i386_plt, /* plt */
6060 0x90, /* plt0_pad_byte */
6061 1, /* is_vxworks */
6062 };
6063
6064 #undef elf_backend_arch_data
6065 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6066
6067 #undef elf_backend_relocs_compatible
6068 #undef elf_backend_add_symbol_hook
6069 #define elf_backend_add_symbol_hook \
6070 elf_vxworks_add_symbol_hook
6071 #undef elf_backend_link_output_symbol_hook
6072 #define elf_backend_link_output_symbol_hook \
6073 elf_vxworks_link_output_symbol_hook
6074 #undef elf_backend_emit_relocs
6075 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6076 #undef elf_backend_final_write_processing
6077 #define elf_backend_final_write_processing \
6078 elf_vxworks_final_write_processing
6079 #undef elf_backend_static_tls_alignment
6080
6081 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6082 define it. */
6083 #undef elf_backend_want_plt_sym
6084 #define elf_backend_want_plt_sym 1
6085
6086 #undef elf32_bed
6087 #define elf32_bed elf32_i386_vxworks_bed
6088
6089 #include "elf32-target.h"
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