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Add R_386_GOT32X support to gas and 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 = ADDR_PREFIX_OPCODE;
2928 nop_offset = roff - 2;
2929 }
2930 else
2931 {
2932 /* Convert to "jmp foo nop". */
2933 modrm = 0xe9;
2934 nop = NOP_OPCODE;
2935 nop_offset = roff + 3;
2936 irel->r_offset -= 1;
2937 }
2938
2939 bfd_put_8 (abfd, nop, contents + nop_offset);
2940 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2941 /* When converting to PC-relative relocation, we
2942 need to adjust addend by -4. */
2943 bfd_put_32 (abfd, -4, contents + irel->r_offset);
2944 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
2945
2946 if (h)
2947 {
2948 if (h->got.refcount > 0)
2949 h->got.refcount -= 1;
2950 }
2951 else
2952 {
2953 if (local_got_refcounts != NULL
2954 && local_got_refcounts[r_symndx] > 0)
2955 local_got_refcounts[r_symndx] -= 1;
2956 }
2957
2958 changed_contents = TRUE;
2959 changed_relocs = TRUE;
2960 }
2961 }
2962 else
2963 {
2964 /* We have "mov foo@GOT[(%re1g)], %reg2",
2965 "test %reg1, foo@GOT(%reg2)" and
2966 "binop foo@GOT[(%reg1)], %reg2".
2967
2968 Avoid optimizing _DYNAMIC since ld.so may use its
2969 link-time address. */
2970 if (h == htab->elf.hdynamic)
2971 continue;
2972
2973 if ((h->root.type == bfd_link_hash_defined
2974 || h->root.type == bfd_link_hash_defweak)
2975 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2976 {
2977 convert_load:
2978 if (opcode == 0x8b)
2979 {
2980 /* Convert "mov foo@GOT(%reg1), %reg2" to
2981 "lea foo@GOTOFF(%reg1), %reg2". */
2982 if (r_type == R_386_GOT32X
2983 && (baseless || !bfd_link_pic (link_info)))
2984 {
2985 r_type = R_386_32;
2986 /* For R_386_32, convert
2987 "lea foo@GOTOFF(%reg1), %reg2" to
2988 "lea foo@GOT, %reg2". */
2989 if (!baseless)
2990 {
2991 modrm = 0x5 | (modrm & 0x38);
2992 bfd_put_8 (abfd, modrm, contents + roff - 1);
2993 }
2994 }
2995 else
2996 r_type = R_386_GOTOFF;
2997 opcode = 0x8d;
2998 }
2999 else
3000 {
3001 /* Addend for R_386_GOT32X relocation must be 0. */
3002 addend = bfd_get_32 (abfd, contents + roff);
3003 if (addend != 0)
3004 continue;
3005
3006 if (opcode == 0x85)
3007 {
3008 /* Convert "test %reg1, foo@GOT(%reg2)" to
3009 "test $foo, %reg1". */
3010 modrm = 0xc0 | (modrm & 0x38) >> 3;
3011 opcode = 0xf7;
3012 }
3013 else
3014 {
3015 /* Convert "binop foo@GOT(%reg1), %reg2" to
3016 "binop $foo, %reg2". */
3017 modrm = (0xc0
3018 | (modrm & 0x38) >> 3
3019 | (opcode & 0x3c));
3020 opcode = 0x81;
3021 }
3022 bfd_put_8 (abfd, modrm, contents + roff - 1);
3023 r_type = R_386_32;
3024 }
3025
3026 bfd_put_8 (abfd, opcode, contents + roff - 2);
3027 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
3028
3029 if (h)
3030 {
3031 if (h->got.refcount > 0)
3032 h->got.refcount -= 1;
3033 }
3034 else
3035 {
3036 if (local_got_refcounts != NULL
3037 && local_got_refcounts[r_symndx] > 0)
3038 local_got_refcounts[r_symndx] -= 1;
3039 }
3040
3041 changed_contents = TRUE;
3042 changed_relocs = TRUE;
3043 }
3044 }
3045 }
3046
3047 if (contents != NULL
3048 && elf_section_data (sec)->this_hdr.contents != contents)
3049 {
3050 if (!changed_contents && !link_info->keep_memory)
3051 free (contents);
3052 else
3053 {
3054 /* Cache the section contents for elf_link_input_bfd. */
3055 elf_section_data (sec)->this_hdr.contents = contents;
3056 }
3057 }
3058
3059 if (elf_section_data (sec)->relocs != internal_relocs)
3060 {
3061 if (!changed_relocs)
3062 free (internal_relocs);
3063 else
3064 elf_section_data (sec)->relocs = internal_relocs;
3065 }
3066
3067 return TRUE;
3068
3069 error_return:
3070 if (contents != NULL
3071 && elf_section_data (sec)->this_hdr.contents != contents)
3072 free (contents);
3073 if (internal_relocs != NULL
3074 && elf_section_data (sec)->relocs != internal_relocs)
3075 free (internal_relocs);
3076 return FALSE;
3077 }
3078
3079 /* Set the sizes of the dynamic sections. */
3080
3081 static bfd_boolean
3082 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3083 {
3084 struct elf_i386_link_hash_table *htab;
3085 bfd *dynobj;
3086 asection *s;
3087 bfd_boolean relocs;
3088 bfd *ibfd;
3089
3090 htab = elf_i386_hash_table (info);
3091 if (htab == NULL)
3092 return FALSE;
3093 dynobj = htab->elf.dynobj;
3094 if (dynobj == NULL)
3095 abort ();
3096
3097 if (htab->elf.dynamic_sections_created)
3098 {
3099 /* Set the contents of the .interp section to the interpreter. */
3100 if (bfd_link_executable (info) && !info->nointerp)
3101 {
3102 s = bfd_get_linker_section (dynobj, ".interp");
3103 if (s == NULL)
3104 abort ();
3105 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
3106 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3107 }
3108 }
3109
3110 /* Set up .got offsets for local syms, and space for local dynamic
3111 relocs. */
3112 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3113 {
3114 bfd_signed_vma *local_got;
3115 bfd_signed_vma *end_local_got;
3116 char *local_tls_type;
3117 bfd_vma *local_tlsdesc_gotent;
3118 bfd_size_type locsymcount;
3119 Elf_Internal_Shdr *symtab_hdr;
3120 asection *srel;
3121
3122 if (! is_i386_elf (ibfd))
3123 continue;
3124
3125 for (s = ibfd->sections; s != NULL; s = s->next)
3126 {
3127 struct elf_dyn_relocs *p;
3128
3129 if (!elf_i386_convert_load (ibfd, s, info))
3130 return FALSE;
3131
3132 for (p = ((struct elf_dyn_relocs *)
3133 elf_section_data (s)->local_dynrel);
3134 p != NULL;
3135 p = p->next)
3136 {
3137 if (!bfd_is_abs_section (p->sec)
3138 && bfd_is_abs_section (p->sec->output_section))
3139 {
3140 /* Input section has been discarded, either because
3141 it is a copy of a linkonce section or due to
3142 linker script /DISCARD/, so we'll be discarding
3143 the relocs too. */
3144 }
3145 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3146 && strcmp (p->sec->output_section->name,
3147 ".tls_vars") == 0)
3148 {
3149 /* Relocations in vxworks .tls_vars sections are
3150 handled specially by the loader. */
3151 }
3152 else if (p->count != 0)
3153 {
3154 srel = elf_section_data (p->sec)->sreloc;
3155 srel->size += p->count * sizeof (Elf32_External_Rel);
3156 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3157 && (info->flags & DF_TEXTREL) == 0)
3158 {
3159 info->flags |= DF_TEXTREL;
3160 if ((info->warn_shared_textrel && bfd_link_pic (info))
3161 || info->error_textrel)
3162 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3163 p->sec->owner, p->sec);
3164 }
3165 }
3166 }
3167 }
3168
3169 local_got = elf_local_got_refcounts (ibfd);
3170 if (!local_got)
3171 continue;
3172
3173 symtab_hdr = &elf_symtab_hdr (ibfd);
3174 locsymcount = symtab_hdr->sh_info;
3175 end_local_got = local_got + locsymcount;
3176 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3177 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3178 s = htab->elf.sgot;
3179 srel = htab->elf.srelgot;
3180 for (; local_got < end_local_got;
3181 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3182 {
3183 *local_tlsdesc_gotent = (bfd_vma) -1;
3184 if (*local_got > 0)
3185 {
3186 if (GOT_TLS_GDESC_P (*local_tls_type))
3187 {
3188 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3189 - elf_i386_compute_jump_table_size (htab);
3190 htab->elf.sgotplt->size += 8;
3191 *local_got = (bfd_vma) -2;
3192 }
3193 if (! GOT_TLS_GDESC_P (*local_tls_type)
3194 || GOT_TLS_GD_P (*local_tls_type))
3195 {
3196 *local_got = s->size;
3197 s->size += 4;
3198 if (GOT_TLS_GD_P (*local_tls_type)
3199 || *local_tls_type == GOT_TLS_IE_BOTH)
3200 s->size += 4;
3201 }
3202 if (bfd_link_pic (info)
3203 || GOT_TLS_GD_ANY_P (*local_tls_type)
3204 || (*local_tls_type & GOT_TLS_IE))
3205 {
3206 if (*local_tls_type == GOT_TLS_IE_BOTH)
3207 srel->size += 2 * sizeof (Elf32_External_Rel);
3208 else if (GOT_TLS_GD_P (*local_tls_type)
3209 || ! GOT_TLS_GDESC_P (*local_tls_type))
3210 srel->size += sizeof (Elf32_External_Rel);
3211 if (GOT_TLS_GDESC_P (*local_tls_type))
3212 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3213 }
3214 }
3215 else
3216 *local_got = (bfd_vma) -1;
3217 }
3218 }
3219
3220 if (htab->tls_ldm_got.refcount > 0)
3221 {
3222 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3223 relocs. */
3224 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3225 htab->elf.sgot->size += 8;
3226 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3227 }
3228 else
3229 htab->tls_ldm_got.offset = -1;
3230
3231 /* Allocate global sym .plt and .got entries, and space for global
3232 sym dynamic relocs. */
3233 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3234
3235 /* Allocate .plt and .got entries, and space for local symbols. */
3236 htab_traverse (htab->loc_hash_table,
3237 elf_i386_allocate_local_dynrelocs,
3238 info);
3239
3240 /* For every jump slot reserved in the sgotplt, reloc_count is
3241 incremented. However, when we reserve space for TLS descriptors,
3242 it's not incremented, so in order to compute the space reserved
3243 for them, it suffices to multiply the reloc count by the jump
3244 slot size.
3245
3246 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3247 so that R_386_IRELATIVE entries come last. */
3248 if (htab->elf.srelplt)
3249 {
3250 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3251 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3252 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3253 }
3254 else if (htab->elf.irelplt)
3255 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3256
3257
3258 if (htab->elf.sgotplt)
3259 {
3260 /* Don't allocate .got.plt section if there are no GOT nor PLT
3261 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3262 if ((htab->elf.hgot == NULL
3263 || !htab->elf.hgot->ref_regular_nonweak)
3264 && (htab->elf.sgotplt->size
3265 == get_elf_backend_data (output_bfd)->got_header_size)
3266 && (htab->elf.splt == NULL
3267 || htab->elf.splt->size == 0)
3268 && (htab->elf.sgot == NULL
3269 || htab->elf.sgot->size == 0)
3270 && (htab->elf.iplt == NULL
3271 || htab->elf.iplt->size == 0)
3272 && (htab->elf.igotplt == NULL
3273 || htab->elf.igotplt->size == 0))
3274 htab->elf.sgotplt->size = 0;
3275 }
3276
3277
3278 if (htab->plt_eh_frame != NULL
3279 && htab->elf.splt != NULL
3280 && htab->elf.splt->size != 0
3281 && !bfd_is_abs_section (htab->elf.splt->output_section)
3282 && _bfd_elf_eh_frame_present (info))
3283 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3284
3285 /* We now have determined the sizes of the various dynamic sections.
3286 Allocate memory for them. */
3287 relocs = FALSE;
3288 for (s = dynobj->sections; s != NULL; s = s->next)
3289 {
3290 bfd_boolean strip_section = TRUE;
3291
3292 if ((s->flags & SEC_LINKER_CREATED) == 0)
3293 continue;
3294
3295 if (s == htab->elf.splt
3296 || s == htab->elf.sgot)
3297 {
3298 /* Strip this section if we don't need it; see the
3299 comment below. */
3300 /* We'd like to strip these sections if they aren't needed, but if
3301 we've exported dynamic symbols from them we must leave them.
3302 It's too late to tell BFD to get rid of the symbols. */
3303
3304 if (htab->elf.hplt != NULL)
3305 strip_section = FALSE;
3306 }
3307 else if (s == htab->elf.sgotplt
3308 || s == htab->elf.iplt
3309 || s == htab->elf.igotplt
3310 || s == htab->plt_got
3311 || s == htab->plt_eh_frame
3312 || s == htab->sdynbss)
3313 {
3314 /* Strip these too. */
3315 }
3316 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3317 {
3318 if (s->size != 0
3319 && s != htab->elf.srelplt
3320 && s != htab->srelplt2)
3321 relocs = TRUE;
3322
3323 /* We use the reloc_count field as a counter if we need
3324 to copy relocs into the output file. */
3325 s->reloc_count = 0;
3326 }
3327 else
3328 {
3329 /* It's not one of our sections, so don't allocate space. */
3330 continue;
3331 }
3332
3333 if (s->size == 0)
3334 {
3335 /* If we don't need this section, strip it from the
3336 output file. This is mostly to handle .rel.bss and
3337 .rel.plt. We must create both sections in
3338 create_dynamic_sections, because they must be created
3339 before the linker maps input sections to output
3340 sections. The linker does that before
3341 adjust_dynamic_symbol is called, and it is that
3342 function which decides whether anything needs to go
3343 into these sections. */
3344 if (strip_section)
3345 s->flags |= SEC_EXCLUDE;
3346 continue;
3347 }
3348
3349 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3350 continue;
3351
3352 /* Allocate memory for the section contents. We use bfd_zalloc
3353 here in case unused entries are not reclaimed before the
3354 section's contents are written out. This should not happen,
3355 but this way if it does, we get a R_386_NONE reloc instead
3356 of garbage. */
3357 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3358 if (s->contents == NULL)
3359 return FALSE;
3360 }
3361
3362 if (htab->plt_eh_frame != NULL
3363 && htab->plt_eh_frame->contents != NULL)
3364 {
3365 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3366 sizeof (elf_i386_eh_frame_plt));
3367 bfd_put_32 (dynobj, htab->elf.splt->size,
3368 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3369 }
3370
3371 if (htab->elf.dynamic_sections_created)
3372 {
3373 /* Add some entries to the .dynamic section. We fill in the
3374 values later, in elf_i386_finish_dynamic_sections, but we
3375 must add the entries now so that we get the correct size for
3376 the .dynamic section. The DT_DEBUG entry is filled in by the
3377 dynamic linker and used by the debugger. */
3378 #define add_dynamic_entry(TAG, VAL) \
3379 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3380
3381 if (bfd_link_executable (info))
3382 {
3383 if (!add_dynamic_entry (DT_DEBUG, 0))
3384 return FALSE;
3385 }
3386
3387 if (htab->elf.splt->size != 0)
3388 {
3389 /* DT_PLTGOT is used by prelink even if there is no PLT
3390 relocation. */
3391 if (!add_dynamic_entry (DT_PLTGOT, 0))
3392 return FALSE;
3393
3394 if (htab->elf.srelplt->size != 0)
3395 {
3396 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3397 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3398 || !add_dynamic_entry (DT_JMPREL, 0))
3399 return FALSE;
3400 }
3401 }
3402
3403 if (relocs)
3404 {
3405 if (!add_dynamic_entry (DT_REL, 0)
3406 || !add_dynamic_entry (DT_RELSZ, 0)
3407 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3408 return FALSE;
3409
3410 /* If any dynamic relocs apply to a read-only section,
3411 then we need a DT_TEXTREL entry. */
3412 if ((info->flags & DF_TEXTREL) == 0)
3413 elf_link_hash_traverse (&htab->elf,
3414 elf_i386_readonly_dynrelocs, info);
3415
3416 if ((info->flags & DF_TEXTREL) != 0)
3417 {
3418 if ((elf_tdata (output_bfd)->has_gnu_symbols
3419 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3420 {
3421 info->callbacks->einfo
3422 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3423 bfd_set_error (bfd_error_bad_value);
3424 return FALSE;
3425 }
3426
3427 if (!add_dynamic_entry (DT_TEXTREL, 0))
3428 return FALSE;
3429 }
3430 }
3431 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3432 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3433 return FALSE;
3434 }
3435 #undef add_dynamic_entry
3436
3437 return TRUE;
3438 }
3439
3440 static bfd_boolean
3441 elf_i386_always_size_sections (bfd *output_bfd,
3442 struct bfd_link_info *info)
3443 {
3444 asection *tls_sec = elf_hash_table (info)->tls_sec;
3445
3446 if (tls_sec)
3447 {
3448 struct elf_link_hash_entry *tlsbase;
3449
3450 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3451 "_TLS_MODULE_BASE_",
3452 FALSE, FALSE, FALSE);
3453
3454 if (tlsbase && tlsbase->type == STT_TLS)
3455 {
3456 struct elf_i386_link_hash_table *htab;
3457 struct bfd_link_hash_entry *bh = NULL;
3458 const struct elf_backend_data *bed
3459 = get_elf_backend_data (output_bfd);
3460
3461 htab = elf_i386_hash_table (info);
3462 if (htab == NULL)
3463 return FALSE;
3464
3465 if (!(_bfd_generic_link_add_one_symbol
3466 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3467 tls_sec, 0, NULL, FALSE,
3468 bed->collect, &bh)))
3469 return FALSE;
3470
3471 htab->tls_module_base = bh;
3472
3473 tlsbase = (struct elf_link_hash_entry *)bh;
3474 tlsbase->def_regular = 1;
3475 tlsbase->other = STV_HIDDEN;
3476 tlsbase->root.linker_def = 1;
3477 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3478 }
3479 }
3480
3481 return TRUE;
3482 }
3483
3484 /* Set the correct type for an x86 ELF section. We do this by the
3485 section name, which is a hack, but ought to work. */
3486
3487 static bfd_boolean
3488 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3489 Elf_Internal_Shdr *hdr,
3490 asection *sec)
3491 {
3492 const char *name;
3493
3494 name = bfd_get_section_name (abfd, sec);
3495
3496 /* This is an ugly, but unfortunately necessary hack that is
3497 needed when producing EFI binaries on x86. It tells
3498 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3499 containing ELF relocation info. We need this hack in order to
3500 be able to generate ELF binaries that can be translated into
3501 EFI applications (which are essentially COFF objects). Those
3502 files contain a COFF ".reloc" section inside an ELFNN object,
3503 which would normally cause BFD to segfault because it would
3504 attempt to interpret this section as containing relocation
3505 entries for section "oc". With this hack enabled, ".reloc"
3506 will be treated as a normal data section, which will avoid the
3507 segfault. However, you won't be able to create an ELFNN binary
3508 with a section named "oc" that needs relocations, but that's
3509 the kind of ugly side-effects you get when detecting section
3510 types based on their names... In practice, this limitation is
3511 unlikely to bite. */
3512 if (strcmp (name, ".reloc") == 0)
3513 hdr->sh_type = SHT_PROGBITS;
3514
3515 return TRUE;
3516 }
3517
3518 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3519 executables. Rather than setting it to the beginning of the TLS
3520 section, we have to set it to the end. This function may be called
3521 multiple times, it is idempotent. */
3522
3523 static void
3524 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3525 {
3526 struct elf_i386_link_hash_table *htab;
3527 struct bfd_link_hash_entry *base;
3528
3529 if (!bfd_link_executable (info))
3530 return;
3531
3532 htab = elf_i386_hash_table (info);
3533 if (htab == NULL)
3534 return;
3535
3536 base = htab->tls_module_base;
3537 if (base == NULL)
3538 return;
3539
3540 base->u.def.value = htab->elf.tls_size;
3541 }
3542
3543 /* Return the base VMA address which should be subtracted from real addresses
3544 when resolving @dtpoff relocation.
3545 This is PT_TLS segment p_vaddr. */
3546
3547 static bfd_vma
3548 elf_i386_dtpoff_base (struct bfd_link_info *info)
3549 {
3550 /* If tls_sec is NULL, we should have signalled an error already. */
3551 if (elf_hash_table (info)->tls_sec == NULL)
3552 return 0;
3553 return elf_hash_table (info)->tls_sec->vma;
3554 }
3555
3556 /* Return the relocation value for @tpoff relocation
3557 if STT_TLS virtual address is ADDRESS. */
3558
3559 static bfd_vma
3560 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3561 {
3562 struct elf_link_hash_table *htab = elf_hash_table (info);
3563 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3564 bfd_vma static_tls_size;
3565
3566 /* If tls_sec is NULL, we should have signalled an error already. */
3567 if (htab->tls_sec == NULL)
3568 return 0;
3569
3570 /* Consider special static TLS alignment requirements. */
3571 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3572 return static_tls_size + htab->tls_sec->vma - address;
3573 }
3574
3575 /* Relocate an i386 ELF section. */
3576
3577 static bfd_boolean
3578 elf_i386_relocate_section (bfd *output_bfd,
3579 struct bfd_link_info *info,
3580 bfd *input_bfd,
3581 asection *input_section,
3582 bfd_byte *contents,
3583 Elf_Internal_Rela *relocs,
3584 Elf_Internal_Sym *local_syms,
3585 asection **local_sections)
3586 {
3587 struct elf_i386_link_hash_table *htab;
3588 Elf_Internal_Shdr *symtab_hdr;
3589 struct elf_link_hash_entry **sym_hashes;
3590 bfd_vma *local_got_offsets;
3591 bfd_vma *local_tlsdesc_gotents;
3592 Elf_Internal_Rela *rel;
3593 Elf_Internal_Rela *relend;
3594 bfd_boolean is_vxworks_tls;
3595 unsigned plt_entry_size;
3596
3597 BFD_ASSERT (is_i386_elf (input_bfd));
3598
3599 htab = elf_i386_hash_table (info);
3600 if (htab == NULL)
3601 return FALSE;
3602 symtab_hdr = &elf_symtab_hdr (input_bfd);
3603 sym_hashes = elf_sym_hashes (input_bfd);
3604 local_got_offsets = elf_local_got_offsets (input_bfd);
3605 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3606 /* We have to handle relocations in vxworks .tls_vars sections
3607 specially, because the dynamic loader is 'weird'. */
3608 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3609 && bfd_link_pic (info)
3610 && !strcmp (input_section->output_section->name,
3611 ".tls_vars"));
3612
3613 elf_i386_set_tls_module_base (info);
3614
3615 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3616
3617 rel = relocs;
3618 relend = relocs + input_section->reloc_count;
3619 for (; rel < relend; rel++)
3620 {
3621 unsigned int r_type;
3622 reloc_howto_type *howto;
3623 unsigned long r_symndx;
3624 struct elf_link_hash_entry *h;
3625 struct elf_i386_link_hash_entry *eh;
3626 Elf_Internal_Sym *sym;
3627 asection *sec;
3628 bfd_vma off, offplt, plt_offset;
3629 bfd_vma relocation;
3630 bfd_boolean unresolved_reloc;
3631 bfd_reloc_status_type r;
3632 unsigned int indx;
3633 int tls_type;
3634 bfd_vma st_size;
3635 asection *resolved_plt;
3636
3637 r_type = ELF32_R_TYPE (rel->r_info);
3638 if (r_type == R_386_GNU_VTINHERIT
3639 || r_type == R_386_GNU_VTENTRY)
3640 continue;
3641
3642 if ((indx = r_type) >= R_386_standard
3643 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3644 >= R_386_ext - R_386_standard)
3645 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3646 >= R_386_ext2 - R_386_ext))
3647 {
3648 (*_bfd_error_handler)
3649 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3650 input_bfd, input_section, r_type);
3651 bfd_set_error (bfd_error_bad_value);
3652 return FALSE;
3653 }
3654 howto = elf_howto_table + indx;
3655
3656 r_symndx = ELF32_R_SYM (rel->r_info);
3657 h = NULL;
3658 sym = NULL;
3659 sec = NULL;
3660 unresolved_reloc = FALSE;
3661 if (r_symndx < symtab_hdr->sh_info)
3662 {
3663 sym = local_syms + r_symndx;
3664 sec = local_sections[r_symndx];
3665 relocation = (sec->output_section->vma
3666 + sec->output_offset
3667 + sym->st_value);
3668 st_size = sym->st_size;
3669
3670 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3671 && ((sec->flags & SEC_MERGE) != 0
3672 || (bfd_link_relocatable (info)
3673 && sec->output_offset != 0)))
3674 {
3675 bfd_vma addend;
3676 bfd_byte *where = contents + rel->r_offset;
3677
3678 switch (howto->size)
3679 {
3680 case 0:
3681 addend = bfd_get_8 (input_bfd, where);
3682 if (howto->pc_relative)
3683 {
3684 addend = (addend ^ 0x80) - 0x80;
3685 addend += 1;
3686 }
3687 break;
3688 case 1:
3689 addend = bfd_get_16 (input_bfd, where);
3690 if (howto->pc_relative)
3691 {
3692 addend = (addend ^ 0x8000) - 0x8000;
3693 addend += 2;
3694 }
3695 break;
3696 case 2:
3697 addend = bfd_get_32 (input_bfd, where);
3698 if (howto->pc_relative)
3699 {
3700 addend = (addend ^ 0x80000000) - 0x80000000;
3701 addend += 4;
3702 }
3703 break;
3704 default:
3705 abort ();
3706 }
3707
3708 if (bfd_link_relocatable (info))
3709 addend += sec->output_offset;
3710 else
3711 {
3712 asection *msec = sec;
3713 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3714 addend);
3715 addend -= relocation;
3716 addend += msec->output_section->vma + msec->output_offset;
3717 }
3718
3719 switch (howto->size)
3720 {
3721 case 0:
3722 /* FIXME: overflow checks. */
3723 if (howto->pc_relative)
3724 addend -= 1;
3725 bfd_put_8 (input_bfd, addend, where);
3726 break;
3727 case 1:
3728 if (howto->pc_relative)
3729 addend -= 2;
3730 bfd_put_16 (input_bfd, addend, where);
3731 break;
3732 case 2:
3733 if (howto->pc_relative)
3734 addend -= 4;
3735 bfd_put_32 (input_bfd, addend, where);
3736 break;
3737 }
3738 }
3739 else if (!bfd_link_relocatable (info)
3740 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3741 {
3742 /* Relocate against local STT_GNU_IFUNC symbol. */
3743 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3744 FALSE);
3745 if (h == NULL)
3746 abort ();
3747
3748 /* Set STT_GNU_IFUNC symbol value. */
3749 h->root.u.def.value = sym->st_value;
3750 h->root.u.def.section = sec;
3751 }
3752 }
3753 else
3754 {
3755 bfd_boolean warned ATTRIBUTE_UNUSED;
3756 bfd_boolean ignored ATTRIBUTE_UNUSED;
3757
3758 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3759 r_symndx, symtab_hdr, sym_hashes,
3760 h, sec, relocation,
3761 unresolved_reloc, warned, ignored);
3762 st_size = h->size;
3763 }
3764
3765 if (sec != NULL && discarded_section (sec))
3766 RELOC_AGAINST_DISCARDED_SECTION (info, input_bfd, input_section,
3767 rel, 1, relend, howto, 0, contents);
3768
3769 if (bfd_link_relocatable (info))
3770 continue;
3771
3772 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3773 it here if it is defined in a non-shared object. */
3774 if (h != NULL
3775 && h->type == STT_GNU_IFUNC
3776 && h->def_regular)
3777 {
3778 asection *plt, *gotplt, *base_got;
3779 bfd_vma plt_index;
3780 const char *name;
3781
3782 if ((input_section->flags & SEC_ALLOC) == 0)
3783 {
3784 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3785 sections because such sections are not SEC_ALLOC and
3786 thus ld.so will not process them. */
3787 if ((input_section->flags & SEC_DEBUGGING) != 0)
3788 continue;
3789 abort ();
3790 }
3791 else if (h->plt.offset == (bfd_vma) -1)
3792 abort ();
3793
3794 /* STT_GNU_IFUNC symbol must go through PLT. */
3795 if (htab->elf.splt != NULL)
3796 {
3797 plt = htab->elf.splt;
3798 gotplt = htab->elf.sgotplt;
3799 }
3800 else
3801 {
3802 plt = htab->elf.iplt;
3803 gotplt = htab->elf.igotplt;
3804 }
3805
3806 relocation = (plt->output_section->vma
3807 + plt->output_offset + h->plt.offset);
3808
3809 switch (r_type)
3810 {
3811 default:
3812 if (h->root.root.string)
3813 name = h->root.root.string;
3814 else
3815 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3816 NULL);
3817 (*_bfd_error_handler)
3818 (_("%B: relocation %s against STT_GNU_IFUNC "
3819 "symbol `%s' isn't handled by %s"), input_bfd,
3820 elf_howto_table[r_type].name,
3821 name, __FUNCTION__);
3822 bfd_set_error (bfd_error_bad_value);
3823 return FALSE;
3824
3825 case R_386_32:
3826 /* Generate dynamic relcoation only when there is a
3827 non-GOT reference in a shared object. */
3828 if (bfd_link_pic (info) && h->non_got_ref)
3829 {
3830 Elf_Internal_Rela outrel;
3831 asection *sreloc;
3832 bfd_vma offset;
3833
3834 /* Need a dynamic relocation to get the real function
3835 adddress. */
3836 offset = _bfd_elf_section_offset (output_bfd,
3837 info,
3838 input_section,
3839 rel->r_offset);
3840 if (offset == (bfd_vma) -1
3841 || offset == (bfd_vma) -2)
3842 abort ();
3843
3844 outrel.r_offset = (input_section->output_section->vma
3845 + input_section->output_offset
3846 + offset);
3847
3848 if (h->dynindx == -1
3849 || h->forced_local
3850 || bfd_link_executable (info))
3851 {
3852 /* This symbol is resolved locally. */
3853 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3854 bfd_put_32 (output_bfd,
3855 (h->root.u.def.value
3856 + h->root.u.def.section->output_section->vma
3857 + h->root.u.def.section->output_offset),
3858 contents + offset);
3859 }
3860 else
3861 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3862
3863 sreloc = htab->elf.irelifunc;
3864 elf_append_rel (output_bfd, sreloc, &outrel);
3865
3866 /* If this reloc is against an external symbol, we
3867 do not want to fiddle with the addend. Otherwise,
3868 we need to include the symbol value so that it
3869 becomes an addend for the dynamic reloc. For an
3870 internal symbol, we have updated addend. */
3871 continue;
3872 }
3873 /* FALLTHROUGH */
3874 case R_386_PC32:
3875 case R_386_PLT32:
3876 goto do_relocation;
3877
3878 case R_386_GOT32:
3879 case R_386_GOT32X:
3880 base_got = htab->elf.sgot;
3881 off = h->got.offset;
3882
3883 if (base_got == NULL)
3884 abort ();
3885
3886 if (off == (bfd_vma) -1)
3887 {
3888 /* We can't use h->got.offset here to save state, or
3889 even just remember the offset, as finish_dynamic_symbol
3890 would use that as offset into .got. */
3891
3892 if (htab->elf.splt != NULL)
3893 {
3894 plt_index = h->plt.offset / plt_entry_size - 1;
3895 off = (plt_index + 3) * 4;
3896 base_got = htab->elf.sgotplt;
3897 }
3898 else
3899 {
3900 plt_index = h->plt.offset / plt_entry_size;
3901 off = plt_index * 4;
3902 base_got = htab->elf.igotplt;
3903 }
3904
3905 if (h->dynindx == -1
3906 || h->forced_local
3907 || info->symbolic)
3908 {
3909 /* This references the local defitionion. We must
3910 initialize this entry in the global offset table.
3911 Since the offset must always be a multiple of 8,
3912 we use the least significant bit to record
3913 whether we have initialized it already.
3914
3915 When doing a dynamic link, we create a .rela.got
3916 relocation entry to initialize the value. This
3917 is done in the finish_dynamic_symbol routine. */
3918 if ((off & 1) != 0)
3919 off &= ~1;
3920 else
3921 {
3922 bfd_put_32 (output_bfd, relocation,
3923 base_got->contents + off);
3924 h->got.offset |= 1;
3925 }
3926 }
3927
3928 relocation = off;
3929
3930 /* Adjust for static executables. */
3931 if (htab->elf.splt == NULL)
3932 relocation += gotplt->output_offset;
3933 }
3934 else
3935 {
3936 relocation = (base_got->output_section->vma
3937 + base_got->output_offset + off
3938 - gotplt->output_section->vma
3939 - gotplt->output_offset);
3940 /* Adjust for static executables. */
3941 if (htab->elf.splt == NULL)
3942 relocation += gotplt->output_offset;
3943 }
3944
3945 goto do_relocation;
3946
3947 case R_386_GOTOFF:
3948 relocation -= (gotplt->output_section->vma
3949 + gotplt->output_offset);
3950 goto do_relocation;
3951 }
3952 }
3953
3954 eh = (struct elf_i386_link_hash_entry *) h;
3955 switch (r_type)
3956 {
3957 case R_386_GOT32X:
3958 /* Avoid optimizing _DYNAMIC since ld.so may use its
3959 link-time address. */
3960 if (h == htab->elf.hdynamic)
3961 goto r_386_got32;
3962
3963 if (bfd_link_pic (info))
3964 {
3965 /* It is OK to convert mov to lea and convert indirect
3966 branch to direct branch. It is OK to convert adc,
3967 add, and, cmp, or, sbb, sub, test, xor only when PIC
3968 is false. */
3969 unsigned int opcode;
3970 opcode = bfd_get_8 (abfd, contents + rel->r_offset - 2);
3971 if (opcode != 0x8b && opcode != 0xff)
3972 goto r_386_got32;
3973 }
3974
3975 /* Resolve "mov GOT[(%reg)], %reg",
3976 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
3977 and "binop foo@GOT[(%reg)], %reg". */
3978 if (h == NULL
3979 || (h->plt.offset == (bfd_vma) -1
3980 && h->got.offset == (bfd_vma) -1)
3981 || htab->elf.sgotplt == NULL)
3982 abort ();
3983
3984 offplt = (htab->elf.sgotplt->output_section->vma
3985 + htab->elf.sgotplt->output_offset);
3986
3987 /* It is relative to .got.plt section. */
3988 if (h->got.offset != (bfd_vma) -1)
3989 /* Use GOT entry. */
3990 relocation = (htab->elf.sgot->output_section->vma
3991 + htab->elf.sgot->output_offset
3992 + h->got.offset - offplt);
3993 else
3994 /* Use GOTPLT entry. */
3995 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
3996
3997 if (!bfd_link_pic (info))
3998 {
3999 /* If not PIC, add the .got.plt section address for
4000 baseless adressing. */
4001 unsigned int modrm;
4002 modrm = bfd_get_8 (abfd, contents + rel->r_offset - 1);
4003 if ((modrm & 0xc7) == 0x5)
4004 relocation += offplt;
4005 }
4006
4007 unresolved_reloc = FALSE;
4008 break;
4009
4010 case R_386_GOT32:
4011 r_386_got32:
4012 /* Relocation is to the entry for this symbol in the global
4013 offset table. */
4014 if (htab->elf.sgot == NULL)
4015 abort ();
4016
4017 if (h != NULL)
4018 {
4019 bfd_boolean dyn;
4020
4021 off = h->got.offset;
4022 dyn = htab->elf.dynamic_sections_created;
4023 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4024 bfd_link_pic (info),
4025 h)
4026 || (bfd_link_pic (info)
4027 && SYMBOL_REFERENCES_LOCAL (info, h))
4028 || (ELF_ST_VISIBILITY (h->other)
4029 && h->root.type == bfd_link_hash_undefweak))
4030 {
4031 /* This is actually a static link, or it is a
4032 -Bsymbolic link and the symbol is defined
4033 locally, or the symbol was forced to be local
4034 because of a version file. We must initialize
4035 this entry in the global offset table. Since the
4036 offset must always be a multiple of 4, we use the
4037 least significant bit to record whether we have
4038 initialized it already.
4039
4040 When doing a dynamic link, we create a .rel.got
4041 relocation entry to initialize the value. This
4042 is done in the finish_dynamic_symbol routine. */
4043 if ((off & 1) != 0)
4044 off &= ~1;
4045 else
4046 {
4047 bfd_put_32 (output_bfd, relocation,
4048 htab->elf.sgot->contents + off);
4049 h->got.offset |= 1;
4050 }
4051 }
4052 else
4053 unresolved_reloc = FALSE;
4054 }
4055 else
4056 {
4057 if (local_got_offsets == NULL)
4058 abort ();
4059
4060 off = local_got_offsets[r_symndx];
4061
4062 /* The offset must always be a multiple of 4. We use
4063 the least significant bit to record whether we have
4064 already generated the necessary reloc. */
4065 if ((off & 1) != 0)
4066 off &= ~1;
4067 else
4068 {
4069 bfd_put_32 (output_bfd, relocation,
4070 htab->elf.sgot->contents + off);
4071
4072 if (bfd_link_pic (info))
4073 {
4074 asection *s;
4075 Elf_Internal_Rela outrel;
4076
4077 s = htab->elf.srelgot;
4078 if (s == NULL)
4079 abort ();
4080
4081 outrel.r_offset = (htab->elf.sgot->output_section->vma
4082 + htab->elf.sgot->output_offset
4083 + off);
4084 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4085 elf_append_rel (output_bfd, s, &outrel);
4086 }
4087
4088 local_got_offsets[r_symndx] |= 1;
4089 }
4090 }
4091
4092 if (off >= (bfd_vma) -2)
4093 abort ();
4094
4095 relocation = htab->elf.sgot->output_section->vma
4096 + htab->elf.sgot->output_offset + off
4097 - htab->elf.sgotplt->output_section->vma
4098 - htab->elf.sgotplt->output_offset;
4099 break;
4100
4101 case R_386_GOTOFF:
4102 /* Relocation is relative to the start of the global offset
4103 table. */
4104
4105 /* Check to make sure it isn't a protected function or data
4106 symbol for shared library since it may not be local when
4107 used as function address or with copy relocation. We also
4108 need to make sure that a symbol is referenced locally. */
4109 if (!bfd_link_executable (info) && h)
4110 {
4111 if (!h->def_regular)
4112 {
4113 const char *v;
4114
4115 switch (ELF_ST_VISIBILITY (h->other))
4116 {
4117 case STV_HIDDEN:
4118 v = _("hidden symbol");
4119 break;
4120 case STV_INTERNAL:
4121 v = _("internal symbol");
4122 break;
4123 case STV_PROTECTED:
4124 v = _("protected symbol");
4125 break;
4126 default:
4127 v = _("symbol");
4128 break;
4129 }
4130
4131 (*_bfd_error_handler)
4132 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4133 input_bfd, v, h->root.root.string);
4134 bfd_set_error (bfd_error_bad_value);
4135 return FALSE;
4136 }
4137 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4138 && (h->type == STT_FUNC
4139 || h->type == STT_OBJECT)
4140 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4141 {
4142 (*_bfd_error_handler)
4143 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4144 input_bfd,
4145 h->type == STT_FUNC ? "function" : "data",
4146 h->root.root.string);
4147 bfd_set_error (bfd_error_bad_value);
4148 return FALSE;
4149 }
4150 }
4151
4152 /* Note that sgot is not involved in this
4153 calculation. We always want the start of .got.plt. If we
4154 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4155 permitted by the ABI, we might have to change this
4156 calculation. */
4157 relocation -= htab->elf.sgotplt->output_section->vma
4158 + htab->elf.sgotplt->output_offset;
4159 break;
4160
4161 case R_386_GOTPC:
4162 /* Use global offset table as symbol value. */
4163 relocation = htab->elf.sgotplt->output_section->vma
4164 + htab->elf.sgotplt->output_offset;
4165 unresolved_reloc = FALSE;
4166 break;
4167
4168 case R_386_PLT32:
4169 /* Relocation is to the entry for this symbol in the
4170 procedure linkage table. */
4171
4172 /* Resolve a PLT32 reloc against a local symbol directly,
4173 without using the procedure linkage table. */
4174 if (h == NULL)
4175 break;
4176
4177 if ((h->plt.offset == (bfd_vma) -1
4178 && eh->plt_got.offset == (bfd_vma) -1)
4179 || htab->elf.splt == NULL)
4180 {
4181 /* We didn't make a PLT entry for this symbol. This
4182 happens when statically linking PIC code, or when
4183 using -Bsymbolic. */
4184 break;
4185 }
4186
4187 if (h->plt.offset != (bfd_vma) -1)
4188 {
4189 resolved_plt = htab->elf.splt;
4190 plt_offset = h->plt.offset;
4191 }
4192 else
4193 {
4194 resolved_plt = htab->plt_got;
4195 plt_offset = eh->plt_got.offset;
4196 }
4197
4198 relocation = (resolved_plt->output_section->vma
4199 + resolved_plt->output_offset
4200 + plt_offset);
4201 unresolved_reloc = FALSE;
4202 break;
4203
4204 case R_386_SIZE32:
4205 /* Set to symbol size. */
4206 relocation = st_size;
4207 /* Fall through. */
4208
4209 case R_386_32:
4210 case R_386_PC32:
4211 if ((input_section->flags & SEC_ALLOC) == 0
4212 || is_vxworks_tls)
4213 break;
4214
4215 /* Copy dynamic function pointer relocations. */
4216 if ((bfd_link_pic (info)
4217 && (h == NULL
4218 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4219 || h->root.type != bfd_link_hash_undefweak)
4220 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4221 || !SYMBOL_CALLS_LOCAL (info, h)))
4222 || (ELIMINATE_COPY_RELOCS
4223 && !bfd_link_pic (info)
4224 && h != NULL
4225 && h->dynindx != -1
4226 && (!h->non_got_ref || eh->func_pointer_refcount > 0)
4227 && ((h->def_dynamic
4228 && !h->def_regular)
4229 || h->root.type == bfd_link_hash_undefweak
4230 || h->root.type == bfd_link_hash_undefined)))
4231 {
4232 Elf_Internal_Rela outrel;
4233 bfd_boolean skip, relocate;
4234 asection *sreloc;
4235
4236 /* When generating a shared object, these relocations
4237 are copied into the output file to be resolved at run
4238 time. */
4239
4240 skip = FALSE;
4241 relocate = FALSE;
4242
4243 outrel.r_offset =
4244 _bfd_elf_section_offset (output_bfd, info, input_section,
4245 rel->r_offset);
4246 if (outrel.r_offset == (bfd_vma) -1)
4247 skip = TRUE;
4248 else if (outrel.r_offset == (bfd_vma) -2)
4249 skip = TRUE, relocate = TRUE;
4250 outrel.r_offset += (input_section->output_section->vma
4251 + input_section->output_offset);
4252
4253 if (skip)
4254 memset (&outrel, 0, sizeof outrel);
4255 else if (h != NULL
4256 && h->dynindx != -1
4257 && (r_type == R_386_PC32
4258 || !bfd_link_pic (info)
4259 || !SYMBOLIC_BIND (info, h)
4260 || !h->def_regular))
4261 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4262 else
4263 {
4264 /* This symbol is local, or marked to become local. */
4265 relocate = TRUE;
4266 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4267 }
4268
4269 sreloc = elf_section_data (input_section)->sreloc;
4270
4271 if (sreloc == NULL || sreloc->contents == NULL)
4272 {
4273 r = bfd_reloc_notsupported;
4274 goto check_relocation_error;
4275 }
4276
4277 elf_append_rel (output_bfd, sreloc, &outrel);
4278
4279 /* If this reloc is against an external symbol, we do
4280 not want to fiddle with the addend. Otherwise, we
4281 need to include the symbol value so that it becomes
4282 an addend for the dynamic reloc. */
4283 if (! relocate)
4284 continue;
4285 }
4286 break;
4287
4288 case R_386_TLS_IE:
4289 if (!bfd_link_executable (info))
4290 {
4291 Elf_Internal_Rela outrel;
4292 asection *sreloc;
4293
4294 outrel.r_offset = rel->r_offset
4295 + input_section->output_section->vma
4296 + input_section->output_offset;
4297 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4298 sreloc = elf_section_data (input_section)->sreloc;
4299 if (sreloc == NULL)
4300 abort ();
4301 elf_append_rel (output_bfd, sreloc, &outrel);
4302 }
4303 /* Fall through */
4304
4305 case R_386_TLS_GD:
4306 case R_386_TLS_GOTDESC:
4307 case R_386_TLS_DESC_CALL:
4308 case R_386_TLS_IE_32:
4309 case R_386_TLS_GOTIE:
4310 tls_type = GOT_UNKNOWN;
4311 if (h == NULL && local_got_offsets)
4312 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4313 else if (h != NULL)
4314 tls_type = elf_i386_hash_entry(h)->tls_type;
4315 if (tls_type == GOT_TLS_IE)
4316 tls_type = GOT_TLS_IE_NEG;
4317
4318 if (! elf_i386_tls_transition (info, input_bfd,
4319 input_section, contents,
4320 symtab_hdr, sym_hashes,
4321 &r_type, tls_type, rel,
4322 relend, h, r_symndx))
4323 return FALSE;
4324
4325 if (r_type == R_386_TLS_LE_32)
4326 {
4327 BFD_ASSERT (! unresolved_reloc);
4328 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4329 {
4330 unsigned int type;
4331 bfd_vma roff;
4332
4333 /* GD->LE transition. */
4334 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4335 if (type == 0x04)
4336 {
4337 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4338 Change it into:
4339 movl %gs:0, %eax; subl $foo@tpoff, %eax
4340 (6 byte form of subl). */
4341 memcpy (contents + rel->r_offset - 3,
4342 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4343 roff = rel->r_offset + 5;
4344 }
4345 else
4346 {
4347 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4348 Change it into:
4349 movl %gs:0, %eax; subl $foo@tpoff, %eax
4350 (6 byte form of subl). */
4351 memcpy (contents + rel->r_offset - 2,
4352 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4353 roff = rel->r_offset + 6;
4354 }
4355 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4356 contents + roff);
4357 /* Skip R_386_PC32/R_386_PLT32. */
4358 rel++;
4359 continue;
4360 }
4361 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4362 {
4363 /* GDesc -> LE transition.
4364 It's originally something like:
4365 leal x@tlsdesc(%ebx), %eax
4366
4367 leal x@ntpoff, %eax
4368
4369 Registers other than %eax may be set up here. */
4370
4371 unsigned int val;
4372 bfd_vma roff;
4373
4374 roff = rel->r_offset;
4375 val = bfd_get_8 (input_bfd, contents + roff - 1);
4376
4377 /* Now modify the instruction as appropriate. */
4378 /* aoliva FIXME: remove the above and xor the byte
4379 below with 0x86. */
4380 bfd_put_8 (output_bfd, val ^ 0x86,
4381 contents + roff - 1);
4382 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4383 contents + roff);
4384 continue;
4385 }
4386 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4387 {
4388 /* GDesc -> LE transition.
4389 It's originally:
4390 call *(%eax)
4391 Turn it into:
4392 xchg %ax,%ax */
4393
4394 bfd_vma roff;
4395
4396 roff = rel->r_offset;
4397 bfd_put_8 (output_bfd, 0x66, contents + roff);
4398 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4399 continue;
4400 }
4401 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4402 {
4403 unsigned int val;
4404
4405 /* IE->LE transition:
4406 Originally it can be one of:
4407 movl foo, %eax
4408 movl foo, %reg
4409 addl foo, %reg
4410 We change it into:
4411 movl $foo, %eax
4412 movl $foo, %reg
4413 addl $foo, %reg. */
4414 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4415 if (val == 0xa1)
4416 {
4417 /* movl foo, %eax. */
4418 bfd_put_8 (output_bfd, 0xb8,
4419 contents + rel->r_offset - 1);
4420 }
4421 else
4422 {
4423 unsigned int type;
4424
4425 type = bfd_get_8 (input_bfd,
4426 contents + rel->r_offset - 2);
4427 switch (type)
4428 {
4429 case 0x8b:
4430 /* movl */
4431 bfd_put_8 (output_bfd, 0xc7,
4432 contents + rel->r_offset - 2);
4433 bfd_put_8 (output_bfd,
4434 0xc0 | ((val >> 3) & 7),
4435 contents + rel->r_offset - 1);
4436 break;
4437 case 0x03:
4438 /* addl */
4439 bfd_put_8 (output_bfd, 0x81,
4440 contents + rel->r_offset - 2);
4441 bfd_put_8 (output_bfd,
4442 0xc0 | ((val >> 3) & 7),
4443 contents + rel->r_offset - 1);
4444 break;
4445 default:
4446 BFD_FAIL ();
4447 break;
4448 }
4449 }
4450 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4451 contents + rel->r_offset);
4452 continue;
4453 }
4454 else
4455 {
4456 unsigned int val, type;
4457
4458 /* {IE_32,GOTIE}->LE transition:
4459 Originally it can be one of:
4460 subl foo(%reg1), %reg2
4461 movl foo(%reg1), %reg2
4462 addl foo(%reg1), %reg2
4463 We change it into:
4464 subl $foo, %reg2
4465 movl $foo, %reg2 (6 byte form)
4466 addl $foo, %reg2. */
4467 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4468 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4469 if (type == 0x8b)
4470 {
4471 /* movl */
4472 bfd_put_8 (output_bfd, 0xc7,
4473 contents + rel->r_offset - 2);
4474 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4475 contents + rel->r_offset - 1);
4476 }
4477 else if (type == 0x2b)
4478 {
4479 /* subl */
4480 bfd_put_8 (output_bfd, 0x81,
4481 contents + rel->r_offset - 2);
4482 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4483 contents + rel->r_offset - 1);
4484 }
4485 else if (type == 0x03)
4486 {
4487 /* addl */
4488 bfd_put_8 (output_bfd, 0x81,
4489 contents + rel->r_offset - 2);
4490 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4491 contents + rel->r_offset - 1);
4492 }
4493 else
4494 BFD_FAIL ();
4495 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4496 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4497 contents + rel->r_offset);
4498 else
4499 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4500 contents + rel->r_offset);
4501 continue;
4502 }
4503 }
4504
4505 if (htab->elf.sgot == NULL)
4506 abort ();
4507
4508 if (h != NULL)
4509 {
4510 off = h->got.offset;
4511 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4512 }
4513 else
4514 {
4515 if (local_got_offsets == NULL)
4516 abort ();
4517
4518 off = local_got_offsets[r_symndx];
4519 offplt = local_tlsdesc_gotents[r_symndx];
4520 }
4521
4522 if ((off & 1) != 0)
4523 off &= ~1;
4524 else
4525 {
4526 Elf_Internal_Rela outrel;
4527 int dr_type;
4528 asection *sreloc;
4529
4530 if (htab->elf.srelgot == NULL)
4531 abort ();
4532
4533 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4534
4535 if (GOT_TLS_GDESC_P (tls_type))
4536 {
4537 bfd_byte *loc;
4538 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4539 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4540 <= htab->elf.sgotplt->size);
4541 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4542 + htab->elf.sgotplt->output_offset
4543 + offplt
4544 + htab->sgotplt_jump_table_size);
4545 sreloc = htab->elf.srelplt;
4546 loc = sreloc->contents;
4547 loc += (htab->next_tls_desc_index++
4548 * sizeof (Elf32_External_Rel));
4549 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4550 <= sreloc->contents + sreloc->size);
4551 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4552 if (indx == 0)
4553 {
4554 BFD_ASSERT (! unresolved_reloc);
4555 bfd_put_32 (output_bfd,
4556 relocation - elf_i386_dtpoff_base (info),
4557 htab->elf.sgotplt->contents + offplt
4558 + htab->sgotplt_jump_table_size + 4);
4559 }
4560 else
4561 {
4562 bfd_put_32 (output_bfd, 0,
4563 htab->elf.sgotplt->contents + offplt
4564 + htab->sgotplt_jump_table_size + 4);
4565 }
4566 }
4567
4568 sreloc = htab->elf.srelgot;
4569
4570 outrel.r_offset = (htab->elf.sgot->output_section->vma
4571 + htab->elf.sgot->output_offset + off);
4572
4573 if (GOT_TLS_GD_P (tls_type))
4574 dr_type = R_386_TLS_DTPMOD32;
4575 else if (GOT_TLS_GDESC_P (tls_type))
4576 goto dr_done;
4577 else if (tls_type == GOT_TLS_IE_POS)
4578 dr_type = R_386_TLS_TPOFF;
4579 else
4580 dr_type = R_386_TLS_TPOFF32;
4581
4582 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4583 bfd_put_32 (output_bfd,
4584 relocation - elf_i386_dtpoff_base (info),
4585 htab->elf.sgot->contents + off);
4586 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4587 bfd_put_32 (output_bfd,
4588 elf_i386_dtpoff_base (info) - relocation,
4589 htab->elf.sgot->contents + off);
4590 else if (dr_type != R_386_TLS_DESC)
4591 bfd_put_32 (output_bfd, 0,
4592 htab->elf.sgot->contents + off);
4593 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4594
4595 elf_append_rel (output_bfd, sreloc, &outrel);
4596
4597 if (GOT_TLS_GD_P (tls_type))
4598 {
4599 if (indx == 0)
4600 {
4601 BFD_ASSERT (! unresolved_reloc);
4602 bfd_put_32 (output_bfd,
4603 relocation - elf_i386_dtpoff_base (info),
4604 htab->elf.sgot->contents + off + 4);
4605 }
4606 else
4607 {
4608 bfd_put_32 (output_bfd, 0,
4609 htab->elf.sgot->contents + off + 4);
4610 outrel.r_info = ELF32_R_INFO (indx,
4611 R_386_TLS_DTPOFF32);
4612 outrel.r_offset += 4;
4613 elf_append_rel (output_bfd, sreloc, &outrel);
4614 }
4615 }
4616 else if (tls_type == GOT_TLS_IE_BOTH)
4617 {
4618 bfd_put_32 (output_bfd,
4619 (indx == 0
4620 ? relocation - elf_i386_dtpoff_base (info)
4621 : 0),
4622 htab->elf.sgot->contents + off + 4);
4623 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4624 outrel.r_offset += 4;
4625 elf_append_rel (output_bfd, sreloc, &outrel);
4626 }
4627
4628 dr_done:
4629 if (h != NULL)
4630 h->got.offset |= 1;
4631 else
4632 local_got_offsets[r_symndx] |= 1;
4633 }
4634
4635 if (off >= (bfd_vma) -2
4636 && ! GOT_TLS_GDESC_P (tls_type))
4637 abort ();
4638 if (r_type == R_386_TLS_GOTDESC
4639 || r_type == R_386_TLS_DESC_CALL)
4640 {
4641 relocation = htab->sgotplt_jump_table_size + offplt;
4642 unresolved_reloc = FALSE;
4643 }
4644 else if (r_type == ELF32_R_TYPE (rel->r_info))
4645 {
4646 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4647 + htab->elf.sgotplt->output_offset;
4648 relocation = htab->elf.sgot->output_section->vma
4649 + htab->elf.sgot->output_offset + off - g_o_t;
4650 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4651 && tls_type == GOT_TLS_IE_BOTH)
4652 relocation += 4;
4653 if (r_type == R_386_TLS_IE)
4654 relocation += g_o_t;
4655 unresolved_reloc = FALSE;
4656 }
4657 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4658 {
4659 unsigned int val, type;
4660 bfd_vma roff;
4661
4662 /* GD->IE transition. */
4663 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4664 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4665 if (type == 0x04)
4666 {
4667 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4668 Change it into:
4669 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4670 val >>= 3;
4671 roff = rel->r_offset - 3;
4672 }
4673 else
4674 {
4675 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4676 Change it into:
4677 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4678 roff = rel->r_offset - 2;
4679 }
4680 memcpy (contents + roff,
4681 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4682 contents[roff + 7] = 0x80 | (val & 7);
4683 /* If foo is used only with foo@gotntpoff(%reg) and
4684 foo@indntpoff, but not with foo@gottpoff(%reg), change
4685 subl $foo@gottpoff(%reg), %eax
4686 into:
4687 addl $foo@gotntpoff(%reg), %eax. */
4688 if (tls_type == GOT_TLS_IE_POS)
4689 contents[roff + 6] = 0x03;
4690 bfd_put_32 (output_bfd,
4691 htab->elf.sgot->output_section->vma
4692 + htab->elf.sgot->output_offset + off
4693 - htab->elf.sgotplt->output_section->vma
4694 - htab->elf.sgotplt->output_offset,
4695 contents + roff + 8);
4696 /* Skip R_386_PLT32. */
4697 rel++;
4698 continue;
4699 }
4700 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4701 {
4702 /* GDesc -> IE transition.
4703 It's originally something like:
4704 leal x@tlsdesc(%ebx), %eax
4705
4706 Change it to:
4707 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4708 or:
4709 movl x@gottpoff(%ebx), %eax # before negl %eax
4710
4711 Registers other than %eax may be set up here. */
4712
4713 bfd_vma roff;
4714
4715 /* First, make sure it's a leal adding ebx to a 32-bit
4716 offset into any register, although it's probably
4717 almost always going to be eax. */
4718 roff = rel->r_offset;
4719
4720 /* Now modify the instruction as appropriate. */
4721 /* To turn a leal into a movl in the form we use it, it
4722 suffices to change the first byte from 0x8d to 0x8b.
4723 aoliva FIXME: should we decide to keep the leal, all
4724 we have to do is remove the statement below, and
4725 adjust the relaxation of R_386_TLS_DESC_CALL. */
4726 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4727
4728 if (tls_type == GOT_TLS_IE_BOTH)
4729 off += 4;
4730
4731 bfd_put_32 (output_bfd,
4732 htab->elf.sgot->output_section->vma
4733 + htab->elf.sgot->output_offset + off
4734 - htab->elf.sgotplt->output_section->vma
4735 - htab->elf.sgotplt->output_offset,
4736 contents + roff);
4737 continue;
4738 }
4739 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4740 {
4741 /* GDesc -> IE transition.
4742 It's originally:
4743 call *(%eax)
4744
4745 Change it to:
4746 xchg %ax,%ax
4747 or
4748 negl %eax
4749 depending on how we transformed the TLS_GOTDESC above.
4750 */
4751
4752 bfd_vma roff;
4753
4754 roff = rel->r_offset;
4755
4756 /* Now modify the instruction as appropriate. */
4757 if (tls_type != GOT_TLS_IE_NEG)
4758 {
4759 /* xchg %ax,%ax */
4760 bfd_put_8 (output_bfd, 0x66, contents + roff);
4761 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4762 }
4763 else
4764 {
4765 /* negl %eax */
4766 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4767 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4768 }
4769
4770 continue;
4771 }
4772 else
4773 BFD_ASSERT (FALSE);
4774 break;
4775
4776 case R_386_TLS_LDM:
4777 if (! elf_i386_tls_transition (info, input_bfd,
4778 input_section, contents,
4779 symtab_hdr, sym_hashes,
4780 &r_type, GOT_UNKNOWN, rel,
4781 relend, h, r_symndx))
4782 return FALSE;
4783
4784 if (r_type != R_386_TLS_LDM)
4785 {
4786 /* LD->LE transition:
4787 leal foo(%reg), %eax; call ___tls_get_addr.
4788 We change it into:
4789 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4790 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4791 memcpy (contents + rel->r_offset - 2,
4792 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4793 /* Skip R_386_PC32/R_386_PLT32. */
4794 rel++;
4795 continue;
4796 }
4797
4798 if (htab->elf.sgot == NULL)
4799 abort ();
4800
4801 off = htab->tls_ldm_got.offset;
4802 if (off & 1)
4803 off &= ~1;
4804 else
4805 {
4806 Elf_Internal_Rela outrel;
4807
4808 if (htab->elf.srelgot == NULL)
4809 abort ();
4810
4811 outrel.r_offset = (htab->elf.sgot->output_section->vma
4812 + htab->elf.sgot->output_offset + off);
4813
4814 bfd_put_32 (output_bfd, 0,
4815 htab->elf.sgot->contents + off);
4816 bfd_put_32 (output_bfd, 0,
4817 htab->elf.sgot->contents + off + 4);
4818 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4819 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4820 htab->tls_ldm_got.offset |= 1;
4821 }
4822 relocation = htab->elf.sgot->output_section->vma
4823 + htab->elf.sgot->output_offset + off
4824 - htab->elf.sgotplt->output_section->vma
4825 - htab->elf.sgotplt->output_offset;
4826 unresolved_reloc = FALSE;
4827 break;
4828
4829 case R_386_TLS_LDO_32:
4830 if (!bfd_link_executable (info)
4831 || (input_section->flags & SEC_CODE) == 0)
4832 relocation -= elf_i386_dtpoff_base (info);
4833 else
4834 /* When converting LDO to LE, we must negate. */
4835 relocation = -elf_i386_tpoff (info, relocation);
4836 break;
4837
4838 case R_386_TLS_LE_32:
4839 case R_386_TLS_LE:
4840 if (!bfd_link_executable (info))
4841 {
4842 Elf_Internal_Rela outrel;
4843 asection *sreloc;
4844
4845 outrel.r_offset = rel->r_offset
4846 + input_section->output_section->vma
4847 + input_section->output_offset;
4848 if (h != NULL && h->dynindx != -1)
4849 indx = h->dynindx;
4850 else
4851 indx = 0;
4852 if (r_type == R_386_TLS_LE_32)
4853 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4854 else
4855 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4856 sreloc = elf_section_data (input_section)->sreloc;
4857 if (sreloc == NULL)
4858 abort ();
4859 elf_append_rel (output_bfd, sreloc, &outrel);
4860 if (indx)
4861 continue;
4862 else if (r_type == R_386_TLS_LE_32)
4863 relocation = elf_i386_dtpoff_base (info) - relocation;
4864 else
4865 relocation -= elf_i386_dtpoff_base (info);
4866 }
4867 else if (r_type == R_386_TLS_LE_32)
4868 relocation = elf_i386_tpoff (info, relocation);
4869 else
4870 relocation = -elf_i386_tpoff (info, relocation);
4871 break;
4872
4873 default:
4874 break;
4875 }
4876
4877 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4878 because such sections are not SEC_ALLOC and thus ld.so will
4879 not process them. */
4880 if (unresolved_reloc
4881 && !((input_section->flags & SEC_DEBUGGING) != 0
4882 && h->def_dynamic)
4883 && _bfd_elf_section_offset (output_bfd, info, input_section,
4884 rel->r_offset) != (bfd_vma) -1)
4885 {
4886 (*_bfd_error_handler)
4887 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4888 input_bfd,
4889 input_section,
4890 (long) rel->r_offset,
4891 howto->name,
4892 h->root.root.string);
4893 return FALSE;
4894 }
4895
4896 do_relocation:
4897 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4898 contents, rel->r_offset,
4899 relocation, 0);
4900
4901 check_relocation_error:
4902 if (r != bfd_reloc_ok)
4903 {
4904 const char *name;
4905
4906 if (h != NULL)
4907 name = h->root.root.string;
4908 else
4909 {
4910 name = bfd_elf_string_from_elf_section (input_bfd,
4911 symtab_hdr->sh_link,
4912 sym->st_name);
4913 if (name == NULL)
4914 return FALSE;
4915 if (*name == '\0')
4916 name = bfd_section_name (input_bfd, sec);
4917 }
4918
4919 if (r == bfd_reloc_overflow)
4920 {
4921 if (! ((*info->callbacks->reloc_overflow)
4922 (info, (h ? &h->root : NULL), name, howto->name,
4923 (bfd_vma) 0, input_bfd, input_section,
4924 rel->r_offset)))
4925 return FALSE;
4926 }
4927 else
4928 {
4929 (*_bfd_error_handler)
4930 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4931 input_bfd, input_section,
4932 (long) rel->r_offset, name, (int) r);
4933 return FALSE;
4934 }
4935 }
4936 }
4937
4938 return TRUE;
4939 }
4940
4941 /* Finish up dynamic symbol handling. We set the contents of various
4942 dynamic sections here. */
4943
4944 static bfd_boolean
4945 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
4946 struct bfd_link_info *info,
4947 struct elf_link_hash_entry *h,
4948 Elf_Internal_Sym *sym)
4949 {
4950 struct elf_i386_link_hash_table *htab;
4951 unsigned plt_entry_size;
4952 const struct elf_i386_backend_data *abed;
4953 struct elf_i386_link_hash_entry *eh;
4954
4955 htab = elf_i386_hash_table (info);
4956 if (htab == NULL)
4957 return FALSE;
4958
4959 abed = get_elf_i386_backend_data (output_bfd);
4960 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
4961
4962 eh = (struct elf_i386_link_hash_entry *) h;
4963
4964 if (h->plt.offset != (bfd_vma) -1)
4965 {
4966 bfd_vma plt_index;
4967 bfd_vma got_offset;
4968 Elf_Internal_Rela rel;
4969 bfd_byte *loc;
4970 asection *plt, *gotplt, *relplt;
4971
4972 /* When building a static executable, use .iplt, .igot.plt and
4973 .rel.iplt sections for STT_GNU_IFUNC symbols. */
4974 if (htab->elf.splt != NULL)
4975 {
4976 plt = htab->elf.splt;
4977 gotplt = htab->elf.sgotplt;
4978 relplt = htab->elf.srelplt;
4979 }
4980 else
4981 {
4982 plt = htab->elf.iplt;
4983 gotplt = htab->elf.igotplt;
4984 relplt = htab->elf.irelplt;
4985 }
4986
4987 /* This symbol has an entry in the procedure linkage table. Set
4988 it up. */
4989
4990 if ((h->dynindx == -1
4991 && !((h->forced_local || bfd_link_executable (info))
4992 && h->def_regular
4993 && h->type == STT_GNU_IFUNC))
4994 || plt == NULL
4995 || gotplt == NULL
4996 || relplt == NULL)
4997 abort ();
4998
4999 /* Get the index in the procedure linkage table which
5000 corresponds to this symbol. This is the index of this symbol
5001 in all the symbols for which we are making plt entries. The
5002 first entry in the procedure linkage table is reserved.
5003
5004 Get the offset into the .got table of the entry that
5005 corresponds to this function. Each .got entry is 4 bytes.
5006 The first three are reserved.
5007
5008 For static executables, we don't reserve anything. */
5009
5010 if (plt == htab->elf.splt)
5011 {
5012 got_offset = h->plt.offset / plt_entry_size - 1;
5013 got_offset = (got_offset + 3) * 4;
5014 }
5015 else
5016 {
5017 got_offset = h->plt.offset / plt_entry_size;
5018 got_offset = got_offset * 4;
5019 }
5020
5021 /* Fill in the entry in the procedure linkage table. */
5022 if (! bfd_link_pic (info))
5023 {
5024 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5025 abed->plt->plt_entry_size);
5026 bfd_put_32 (output_bfd,
5027 (gotplt->output_section->vma
5028 + gotplt->output_offset
5029 + got_offset),
5030 plt->contents + h->plt.offset
5031 + abed->plt->plt_got_offset);
5032
5033 if (abed->is_vxworks)
5034 {
5035 int s, k, reloc_index;
5036
5037 /* Create the R_386_32 relocation referencing the GOT
5038 for this PLT entry. */
5039
5040 /* S: Current slot number (zero-based). */
5041 s = ((h->plt.offset - abed->plt->plt_entry_size)
5042 / abed->plt->plt_entry_size);
5043 /* K: Number of relocations for PLTResolve. */
5044 if (bfd_link_pic (info))
5045 k = PLTRESOLVE_RELOCS_SHLIB;
5046 else
5047 k = PLTRESOLVE_RELOCS;
5048 /* Skip the PLTresolve relocations, and the relocations for
5049 the other PLT slots. */
5050 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5051 loc = (htab->srelplt2->contents + reloc_index
5052 * sizeof (Elf32_External_Rel));
5053
5054 rel.r_offset = (htab->elf.splt->output_section->vma
5055 + htab->elf.splt->output_offset
5056 + h->plt.offset + 2),
5057 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5058 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5059
5060 /* Create the R_386_32 relocation referencing the beginning of
5061 the PLT for this GOT entry. */
5062 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5063 + htab->elf.sgotplt->output_offset
5064 + got_offset);
5065 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5066 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5067 loc + sizeof (Elf32_External_Rel));
5068 }
5069 }
5070 else
5071 {
5072 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5073 abed->plt->plt_entry_size);
5074 bfd_put_32 (output_bfd, got_offset,
5075 plt->contents + h->plt.offset
5076 + abed->plt->plt_got_offset);
5077 }
5078
5079 /* Fill in the entry in the global offset table. */
5080 bfd_put_32 (output_bfd,
5081 (plt->output_section->vma
5082 + plt->output_offset
5083 + h->plt.offset
5084 + abed->plt->plt_lazy_offset),
5085 gotplt->contents + got_offset);
5086
5087 /* Fill in the entry in the .rel.plt section. */
5088 rel.r_offset = (gotplt->output_section->vma
5089 + gotplt->output_offset
5090 + got_offset);
5091 if (h->dynindx == -1
5092 || ((bfd_link_executable (info)
5093 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5094 && h->def_regular
5095 && h->type == STT_GNU_IFUNC))
5096 {
5097 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5098 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5099 in the .got.plt section. */
5100 bfd_put_32 (output_bfd,
5101 (h->root.u.def.value
5102 + h->root.u.def.section->output_section->vma
5103 + h->root.u.def.section->output_offset),
5104 gotplt->contents + got_offset);
5105 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5106 /* R_386_IRELATIVE comes last. */
5107 plt_index = htab->next_irelative_index--;
5108 }
5109 else
5110 {
5111 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5112 plt_index = htab->next_jump_slot_index++;
5113 }
5114 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5115 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5116
5117 /* Don't fill PLT entry for static executables. */
5118 if (plt == htab->elf.splt)
5119 {
5120 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
5121 plt->contents + h->plt.offset
5122 + abed->plt->plt_reloc_offset);
5123 bfd_put_32 (output_bfd, - (h->plt.offset
5124 + abed->plt->plt_plt_offset + 4),
5125 plt->contents + h->plt.offset
5126 + abed->plt->plt_plt_offset);
5127 }
5128 }
5129 else if (eh->plt_got.offset != (bfd_vma) -1)
5130 {
5131 bfd_vma got_offset, plt_offset;
5132 asection *plt, *got, *gotplt;
5133 const bfd_byte *got_plt_entry;
5134
5135 /* Offset of displacement of the indirect jump. */
5136 bfd_vma plt_got_offset = 2;
5137
5138 /* Set the entry in the GOT procedure linkage table. */
5139 plt = htab->plt_got;
5140 got = htab->elf.sgot;
5141 gotplt = htab->elf.sgotplt;
5142 got_offset = h->got.offset;
5143
5144 if (got_offset == (bfd_vma) -1
5145 || plt == NULL
5146 || got == NULL
5147 || gotplt == NULL)
5148 abort ();
5149
5150 /* Fill in the entry in the GOT procedure linkage table. */
5151 if (! bfd_link_pic (info))
5152 {
5153 got_plt_entry = elf_i386_got_plt_entry;
5154 got_offset += got->output_section->vma + got->output_offset;
5155 }
5156 else
5157 {
5158 got_plt_entry = elf_i386_pic_got_plt_entry;
5159 got_offset += (got->output_section->vma
5160 + got->output_offset
5161 - gotplt->output_section->vma
5162 - gotplt->output_offset);
5163 }
5164
5165 plt_offset = eh->plt_got.offset;
5166 memcpy (plt->contents + plt_offset, got_plt_entry,
5167 sizeof (elf_i386_got_plt_entry));
5168 bfd_put_32 (output_bfd, got_offset,
5169 plt->contents + plt_offset + plt_got_offset);
5170 }
5171
5172 if (!h->def_regular
5173 && (h->plt.offset != (bfd_vma) -1
5174 || eh->plt_got.offset != (bfd_vma) -1))
5175 {
5176 /* Mark the symbol as undefined, rather than as defined in
5177 the .plt section. Leave the value if there were any
5178 relocations where pointer equality matters (this is a clue
5179 for the dynamic linker, to make function pointer
5180 comparisons work between an application and shared
5181 library), otherwise set it to zero. If a function is only
5182 called from a binary, there is no need to slow down
5183 shared libraries because of that. */
5184 sym->st_shndx = SHN_UNDEF;
5185 if (!h->pointer_equality_needed)
5186 sym->st_value = 0;
5187 }
5188
5189 if (h->got.offset != (bfd_vma) -1
5190 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5191 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
5192 {
5193 Elf_Internal_Rela rel;
5194
5195 /* This symbol has an entry in the global offset table. Set it
5196 up. */
5197
5198 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5199 abort ();
5200
5201 rel.r_offset = (htab->elf.sgot->output_section->vma
5202 + htab->elf.sgot->output_offset
5203 + (h->got.offset & ~(bfd_vma) 1));
5204
5205 /* If this is a static link, or it is a -Bsymbolic link and the
5206 symbol is defined locally or was forced to be local because
5207 of a version file, we just want to emit a RELATIVE reloc.
5208 The entry in the global offset table will already have been
5209 initialized in the relocate_section function. */
5210 if (h->def_regular
5211 && h->type == STT_GNU_IFUNC)
5212 {
5213 if (bfd_link_pic (info))
5214 {
5215 /* Generate R_386_GLOB_DAT. */
5216 goto do_glob_dat;
5217 }
5218 else
5219 {
5220 asection *plt;
5221
5222 if (!h->pointer_equality_needed)
5223 abort ();
5224
5225 /* For non-shared object, we can't use .got.plt, which
5226 contains the real function addres if we need pointer
5227 equality. We load the GOT entry with the PLT entry. */
5228 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5229 bfd_put_32 (output_bfd,
5230 (plt->output_section->vma
5231 + plt->output_offset + h->plt.offset),
5232 htab->elf.sgot->contents + h->got.offset);
5233 return TRUE;
5234 }
5235 }
5236 else if (bfd_link_pic (info)
5237 && SYMBOL_REFERENCES_LOCAL (info, h))
5238 {
5239 BFD_ASSERT((h->got.offset & 1) != 0);
5240 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5241 }
5242 else
5243 {
5244 BFD_ASSERT((h->got.offset & 1) == 0);
5245 do_glob_dat:
5246 bfd_put_32 (output_bfd, (bfd_vma) 0,
5247 htab->elf.sgot->contents + h->got.offset);
5248 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5249 }
5250
5251 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5252 }
5253
5254 if (h->needs_copy)
5255 {
5256 Elf_Internal_Rela rel;
5257
5258 /* This symbol needs a copy reloc. Set it up. */
5259
5260 if (h->dynindx == -1
5261 || (h->root.type != bfd_link_hash_defined
5262 && h->root.type != bfd_link_hash_defweak)
5263 || htab->srelbss == NULL)
5264 abort ();
5265
5266 rel.r_offset = (h->root.u.def.value
5267 + h->root.u.def.section->output_section->vma
5268 + h->root.u.def.section->output_offset);
5269 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5270 elf_append_rel (output_bfd, htab->srelbss, &rel);
5271 }
5272
5273 return TRUE;
5274 }
5275
5276 /* Finish up local dynamic symbol handling. We set the contents of
5277 various dynamic sections here. */
5278
5279 static bfd_boolean
5280 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5281 {
5282 struct elf_link_hash_entry *h
5283 = (struct elf_link_hash_entry *) *slot;
5284 struct bfd_link_info *info
5285 = (struct bfd_link_info *) inf;
5286
5287 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5288 h, NULL);
5289 }
5290
5291 /* Used to decide how to sort relocs in an optimal manner for the
5292 dynamic linker, before writing them out. */
5293
5294 static enum elf_reloc_type_class
5295 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5296 const asection *rel_sec ATTRIBUTE_UNUSED,
5297 const Elf_Internal_Rela *rela)
5298 {
5299 bfd *abfd = info->output_bfd;
5300 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5301 struct elf_link_hash_table *htab = elf_hash_table (info);
5302 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5303 Elf_Internal_Sym sym;
5304
5305 if (htab->dynsym == NULL
5306 || !bed->s->swap_symbol_in (abfd,
5307 (htab->dynsym->contents
5308 + r_symndx * sizeof (Elf32_External_Sym)),
5309 0, &sym))
5310 abort ();
5311
5312 /* Check relocation against STT_GNU_IFUNC symbol. */
5313 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5314 return reloc_class_ifunc;
5315
5316 switch (ELF32_R_TYPE (rela->r_info))
5317 {
5318 case R_386_RELATIVE:
5319 return reloc_class_relative;
5320 case R_386_JUMP_SLOT:
5321 return reloc_class_plt;
5322 case R_386_COPY:
5323 return reloc_class_copy;
5324 default:
5325 return reloc_class_normal;
5326 }
5327 }
5328
5329 /* Finish up the dynamic sections. */
5330
5331 static bfd_boolean
5332 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5333 struct bfd_link_info *info)
5334 {
5335 struct elf_i386_link_hash_table *htab;
5336 bfd *dynobj;
5337 asection *sdyn;
5338 const struct elf_i386_backend_data *abed;
5339
5340 htab = elf_i386_hash_table (info);
5341 if (htab == NULL)
5342 return FALSE;
5343
5344 dynobj = htab->elf.dynobj;
5345 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5346 abed = get_elf_i386_backend_data (output_bfd);
5347
5348 if (htab->elf.dynamic_sections_created)
5349 {
5350 Elf32_External_Dyn *dyncon, *dynconend;
5351
5352 if (sdyn == NULL || htab->elf.sgot == NULL)
5353 abort ();
5354
5355 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5356 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5357 for (; dyncon < dynconend; dyncon++)
5358 {
5359 Elf_Internal_Dyn dyn;
5360 asection *s;
5361
5362 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5363
5364 switch (dyn.d_tag)
5365 {
5366 default:
5367 if (abed->is_vxworks
5368 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5369 break;
5370 continue;
5371
5372 case DT_PLTGOT:
5373 s = htab->elf.sgotplt;
5374 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5375 break;
5376
5377 case DT_JMPREL:
5378 s = htab->elf.srelplt;
5379 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5380 break;
5381
5382 case DT_PLTRELSZ:
5383 s = htab->elf.srelplt;
5384 dyn.d_un.d_val = s->size;
5385 break;
5386
5387 case DT_RELSZ:
5388 /* My reading of the SVR4 ABI indicates that the
5389 procedure linkage table relocs (DT_JMPREL) should be
5390 included in the overall relocs (DT_REL). This is
5391 what Solaris does. However, UnixWare can not handle
5392 that case. Therefore, we override the DT_RELSZ entry
5393 here to make it not include the JMPREL relocs. */
5394 s = htab->elf.srelplt;
5395 if (s == NULL)
5396 continue;
5397 dyn.d_un.d_val -= s->size;
5398 break;
5399
5400 case DT_REL:
5401 /* We may not be using the standard ELF linker script.
5402 If .rel.plt is the first .rel section, we adjust
5403 DT_REL to not include it. */
5404 s = htab->elf.srelplt;
5405 if (s == NULL)
5406 continue;
5407 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5408 continue;
5409 dyn.d_un.d_ptr += s->size;
5410 break;
5411 }
5412
5413 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5414 }
5415
5416 /* Fill in the first entry in the procedure linkage table. */
5417 if (htab->elf.splt && htab->elf.splt->size > 0)
5418 {
5419 if (bfd_link_pic (info))
5420 {
5421 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5422 abed->plt->plt0_entry_size);
5423 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5424 abed->plt0_pad_byte,
5425 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5426 }
5427 else
5428 {
5429 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5430 abed->plt->plt0_entry_size);
5431 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5432 abed->plt0_pad_byte,
5433 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5434 bfd_put_32 (output_bfd,
5435 (htab->elf.sgotplt->output_section->vma
5436 + htab->elf.sgotplt->output_offset
5437 + 4),
5438 htab->elf.splt->contents
5439 + abed->plt->plt0_got1_offset);
5440 bfd_put_32 (output_bfd,
5441 (htab->elf.sgotplt->output_section->vma
5442 + htab->elf.sgotplt->output_offset
5443 + 8),
5444 htab->elf.splt->contents
5445 + abed->plt->plt0_got2_offset);
5446
5447 if (abed->is_vxworks)
5448 {
5449 Elf_Internal_Rela rel;
5450
5451 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5452 On IA32 we use REL relocations so the addend goes in
5453 the PLT directly. */
5454 rel.r_offset = (htab->elf.splt->output_section->vma
5455 + htab->elf.splt->output_offset
5456 + abed->plt->plt0_got1_offset);
5457 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5458 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5459 htab->srelplt2->contents);
5460 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5461 rel.r_offset = (htab->elf.splt->output_section->vma
5462 + htab->elf.splt->output_offset
5463 + abed->plt->plt0_got2_offset);
5464 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5465 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5466 htab->srelplt2->contents +
5467 sizeof (Elf32_External_Rel));
5468 }
5469 }
5470
5471 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5472 really seem like the right value. */
5473 elf_section_data (htab->elf.splt->output_section)
5474 ->this_hdr.sh_entsize = 4;
5475
5476 /* Correct the .rel.plt.unloaded relocations. */
5477 if (abed->is_vxworks && !bfd_link_pic (info))
5478 {
5479 int num_plts = (htab->elf.splt->size
5480 / abed->plt->plt_entry_size) - 1;
5481 unsigned char *p;
5482
5483 p = htab->srelplt2->contents;
5484 if (bfd_link_pic (info))
5485 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5486 else
5487 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5488
5489 for (; num_plts; num_plts--)
5490 {
5491 Elf_Internal_Rela rel;
5492 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5493 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5494 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5495 p += sizeof (Elf32_External_Rel);
5496
5497 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5498 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5499 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5500 p += sizeof (Elf32_External_Rel);
5501 }
5502 }
5503 }
5504 }
5505
5506 if (htab->elf.sgotplt)
5507 {
5508 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5509 {
5510 (*_bfd_error_handler)
5511 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5512 return FALSE;
5513 }
5514
5515 /* Fill in the first three entries in the global offset table. */
5516 if (htab->elf.sgotplt->size > 0)
5517 {
5518 bfd_put_32 (output_bfd,
5519 (sdyn == NULL ? 0
5520 : sdyn->output_section->vma + sdyn->output_offset),
5521 htab->elf.sgotplt->contents);
5522 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5523 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5524 }
5525
5526 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5527 }
5528
5529 /* Adjust .eh_frame for .plt section. */
5530 if (htab->plt_eh_frame != NULL
5531 && htab->plt_eh_frame->contents != NULL)
5532 {
5533 if (htab->elf.splt != NULL
5534 && htab->elf.splt->size != 0
5535 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5536 && htab->elf.splt->output_section != NULL
5537 && htab->plt_eh_frame->output_section != NULL)
5538 {
5539 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5540 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5541 + htab->plt_eh_frame->output_offset
5542 + PLT_FDE_START_OFFSET;
5543 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5544 htab->plt_eh_frame->contents
5545 + PLT_FDE_START_OFFSET);
5546 }
5547 if (htab->plt_eh_frame->sec_info_type
5548 == SEC_INFO_TYPE_EH_FRAME)
5549 {
5550 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5551 htab->plt_eh_frame,
5552 htab->plt_eh_frame->contents))
5553 return FALSE;
5554 }
5555 }
5556
5557 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5558 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5559
5560 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5561 htab_traverse (htab->loc_hash_table,
5562 elf_i386_finish_local_dynamic_symbol,
5563 info);
5564
5565 return TRUE;
5566 }
5567
5568 /* Return an array of PLT entry symbol values. */
5569
5570 static bfd_vma *
5571 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5572 asection *relplt)
5573 {
5574 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5575 arelent *p;
5576 long count, i;
5577 bfd_vma *plt_sym_val;
5578 bfd_vma plt_offset;
5579 bfd_byte *plt_contents;
5580 const struct elf_i386_backend_data *bed
5581 = get_elf_i386_backend_data (abfd);
5582 Elf_Internal_Shdr *hdr;
5583
5584 /* Get the .plt section contents. */
5585 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5586 if (plt_contents == NULL)
5587 return NULL;
5588 if (!bfd_get_section_contents (abfd, (asection *) plt,
5589 plt_contents, 0, plt->size))
5590 {
5591 bad_return:
5592 free (plt_contents);
5593 return NULL;
5594 }
5595
5596 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5597 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5598 goto bad_return;
5599
5600 hdr = &elf_section_data (relplt)->this_hdr;
5601 count = relplt->size / hdr->sh_entsize;
5602
5603 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5604 if (plt_sym_val == NULL)
5605 goto bad_return;
5606
5607 for (i = 0; i < count; i++)
5608 plt_sym_val[i] = -1;
5609
5610 plt_offset = bed->plt->plt_entry_size;
5611 p = relplt->relocation;
5612 for (i = 0; i < count; i++, p++)
5613 {
5614 long reloc_index;
5615
5616 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5617 if (p->howto == NULL)
5618 continue;
5619
5620 if (p->howto->type != R_386_JUMP_SLOT
5621 && p->howto->type != R_386_IRELATIVE)
5622 continue;
5623
5624 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5625 + bed->plt->plt_reloc_offset));
5626 reloc_index /= sizeof (Elf32_External_Rel);
5627 if (reloc_index >= count)
5628 abort ();
5629 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5630 plt_offset += bed->plt->plt_entry_size;
5631
5632 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5633 section. */
5634 if (plt_offset >= plt->size)
5635 break;
5636 }
5637
5638 free (plt_contents);
5639
5640 return plt_sym_val;
5641 }
5642
5643 /* Similar to _bfd_elf_get_synthetic_symtab. */
5644
5645 static long
5646 elf_i386_get_synthetic_symtab (bfd *abfd,
5647 long symcount,
5648 asymbol **syms,
5649 long dynsymcount,
5650 asymbol **dynsyms,
5651 asymbol **ret)
5652 {
5653 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5654 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5655 dynsymcount, dynsyms, ret,
5656 plt,
5657 elf_i386_get_plt_sym_val);
5658 }
5659
5660 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5661
5662 static bfd_boolean
5663 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5664 {
5665 if (h->plt.offset != (bfd_vma) -1
5666 && !h->def_regular
5667 && !h->pointer_equality_needed)
5668 return FALSE;
5669
5670 return _bfd_elf_hash_symbol (h);
5671 }
5672
5673 /* Hook called by the linker routine which adds symbols from an object
5674 file. */
5675
5676 static bfd_boolean
5677 elf_i386_add_symbol_hook (bfd * abfd,
5678 struct bfd_link_info * info,
5679 Elf_Internal_Sym * sym,
5680 const char ** namep ATTRIBUTE_UNUSED,
5681 flagword * flagsp ATTRIBUTE_UNUSED,
5682 asection ** secp ATTRIBUTE_UNUSED,
5683 bfd_vma * valp ATTRIBUTE_UNUSED)
5684 {
5685 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5686 && (abfd->flags & DYNAMIC) == 0
5687 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5688 elf_tdata (info->output_bfd)->has_gnu_symbols
5689 |= elf_gnu_symbol_unique;
5690
5691 return TRUE;
5692 }
5693
5694 #define TARGET_LITTLE_SYM i386_elf32_vec
5695 #define TARGET_LITTLE_NAME "elf32-i386"
5696 #define ELF_ARCH bfd_arch_i386
5697 #define ELF_TARGET_ID I386_ELF_DATA
5698 #define ELF_MACHINE_CODE EM_386
5699 #define ELF_MAXPAGESIZE 0x1000
5700
5701 #define elf_backend_can_gc_sections 1
5702 #define elf_backend_can_refcount 1
5703 #define elf_backend_want_got_plt 1
5704 #define elf_backend_plt_readonly 1
5705 #define elf_backend_want_plt_sym 0
5706 #define elf_backend_got_header_size 12
5707 #define elf_backend_plt_alignment 4
5708 #define elf_backend_extern_protected_data 1
5709
5710 /* Support RELA for objdump of prelink objects. */
5711 #define elf_info_to_howto elf_i386_info_to_howto_rel
5712 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5713
5714 #define bfd_elf32_mkobject elf_i386_mkobject
5715
5716 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5717 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5718 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5719 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5720 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5721
5722 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5723 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5724 #define elf_backend_check_relocs elf_i386_check_relocs
5725 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5726 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5727 #define elf_backend_fake_sections elf_i386_fake_sections
5728 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5729 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5730 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5731 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5732 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5733 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5734 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5735 #define elf_backend_relocate_section elf_i386_relocate_section
5736 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5737 #define elf_backend_always_size_sections elf_i386_always_size_sections
5738 #define elf_backend_omit_section_dynsym \
5739 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5740 #define elf_backend_hash_symbol elf_i386_hash_symbol
5741 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5742
5743 #include "elf32-target.h"
5744
5745 /* FreeBSD support. */
5746
5747 #undef TARGET_LITTLE_SYM
5748 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5749 #undef TARGET_LITTLE_NAME
5750 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5751 #undef ELF_OSABI
5752 #define ELF_OSABI ELFOSABI_FREEBSD
5753
5754 /* The kernel recognizes executables as valid only if they carry a
5755 "FreeBSD" label in the ELF header. So we put this label on all
5756 executables and (for simplicity) also all other object files. */
5757
5758 static void
5759 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5760 {
5761 _bfd_elf_post_process_headers (abfd, info);
5762
5763 #ifdef OLD_FREEBSD_ABI_LABEL
5764 {
5765 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5766 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5767 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5768 }
5769 #endif
5770 }
5771
5772 #undef elf_backend_post_process_headers
5773 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5774 #undef elf32_bed
5775 #define elf32_bed elf32_i386_fbsd_bed
5776
5777 #undef elf_backend_add_symbol_hook
5778
5779 #include "elf32-target.h"
5780
5781 /* Solaris 2. */
5782
5783 #undef TARGET_LITTLE_SYM
5784 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5785 #undef TARGET_LITTLE_NAME
5786 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5787
5788 #undef elf_backend_post_process_headers
5789
5790 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5791 objects won't be recognized. */
5792 #undef ELF_OSABI
5793
5794 #undef elf32_bed
5795 #define elf32_bed elf32_i386_sol2_bed
5796
5797 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5798 boundary. */
5799 #undef elf_backend_static_tls_alignment
5800 #define elf_backend_static_tls_alignment 8
5801
5802 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5803
5804 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5805 File, p.63. */
5806 #undef elf_backend_want_plt_sym
5807 #define elf_backend_want_plt_sym 1
5808
5809 #include "elf32-target.h"
5810
5811 /* Intel MCU support. */
5812
5813 static bfd_boolean
5814 elf32_iamcu_elf_object_p (bfd *abfd)
5815 {
5816 /* Set the right machine number for an IAMCU elf32 file. */
5817 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5818 return TRUE;
5819 }
5820
5821 #undef TARGET_LITTLE_SYM
5822 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5823 #undef TARGET_LITTLE_NAME
5824 #define TARGET_LITTLE_NAME "elf32-iamcu"
5825 #undef ELF_ARCH
5826 #define ELF_ARCH bfd_arch_iamcu
5827
5828 #undef ELF_MACHINE_CODE
5829 #define ELF_MACHINE_CODE EM_IAMCU
5830
5831 #undef ELF_OSABI
5832
5833 #undef elf32_bed
5834 #define elf32_bed elf32_iamcu_bed
5835
5836 #undef elf_backend_object_p
5837 #define elf_backend_object_p elf32_iamcu_elf_object_p
5838
5839 #undef elf_backend_static_tls_alignment
5840
5841 #undef elf_backend_want_plt_sym
5842 #define elf_backend_want_plt_sym 0
5843
5844 #include "elf32-target.h"
5845
5846 /* Restore defaults. */
5847 #undef ELF_ARCH
5848 #define ELF_ARCH bfd_arch_i386
5849 #undef ELF_MACHINE_CODE
5850 #define ELF_MACHINE_CODE EM_386
5851
5852 /* Native Client support. */
5853
5854 #undef TARGET_LITTLE_SYM
5855 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5856 #undef TARGET_LITTLE_NAME
5857 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5858 #undef elf32_bed
5859 #define elf32_bed elf32_i386_nacl_bed
5860
5861 #undef ELF_MAXPAGESIZE
5862 #define ELF_MAXPAGESIZE 0x10000
5863
5864 /* Restore defaults. */
5865 #undef ELF_OSABI
5866 #undef elf_backend_want_plt_sym
5867 #define elf_backend_want_plt_sym 0
5868 #undef elf_backend_post_process_headers
5869 #undef elf_backend_static_tls_alignment
5870
5871 /* NaCl uses substantially different PLT entries for the same effects. */
5872
5873 #undef elf_backend_plt_alignment
5874 #define elf_backend_plt_alignment 5
5875 #define NACL_PLT_ENTRY_SIZE 64
5876 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5877
5878 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5879 {
5880 0xff, 0x35, /* pushl contents of address */
5881 0, 0, 0, 0, /* replaced with address of .got + 4. */
5882 0x8b, 0x0d, /* movl contents of address, %ecx */
5883 0, 0, 0, 0, /* replaced with address of .got + 8. */
5884 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5885 0xff, 0xe1 /* jmp *%ecx */
5886 };
5887
5888 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5889 {
5890 0x8b, 0x0d, /* movl contents of address, %ecx */
5891 0, 0, 0, 0, /* replaced with GOT slot address. */
5892 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5893 0xff, 0xe1, /* jmp *%ecx */
5894
5895 /* Pad to the next 32-byte boundary with nop instructions. */
5896 0x90,
5897 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5898 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5899
5900 /* Lazy GOT entries point here (32-byte aligned). */
5901 0x68, /* pushl immediate */
5902 0, 0, 0, 0, /* replaced with reloc offset. */
5903 0xe9, /* jmp relative */
5904 0, 0, 0, 0, /* replaced with offset to .plt. */
5905
5906 /* Pad to the next 32-byte boundary with nop instructions. */
5907 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5908 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5909 0x90, 0x90
5910 };
5911
5912 static const bfd_byte
5913 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5914 {
5915 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5916 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5917 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5918 0xff, 0xe1, /* jmp *%ecx */
5919
5920 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5921 so pad to that size with nop instructions. */
5922 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5923 };
5924
5925 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5926 {
5927 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5928 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5929 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5930 0xff, 0xe1, /* jmp *%ecx */
5931
5932 /* Pad to the next 32-byte boundary with nop instructions. */
5933 0x90,
5934 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5935 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5936
5937 /* Lazy GOT entries point here (32-byte aligned). */
5938 0x68, /* pushl immediate */
5939 0, 0, 0, 0, /* replaced with offset into relocation table. */
5940 0xe9, /* jmp relative */
5941 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5942
5943 /* Pad to the next 32-byte boundary with nop instructions. */
5944 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5945 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5946 0x90, 0x90
5947 };
5948
5949 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
5950 {
5951 #if (PLT_CIE_LENGTH != 20 \
5952 || PLT_FDE_LENGTH != 36 \
5953 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
5954 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
5955 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
5956 #endif
5957 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
5958 0, 0, 0, 0, /* CIE ID */
5959 1, /* CIE version */
5960 'z', 'R', 0, /* Augmentation string */
5961 1, /* Code alignment factor */
5962 0x7c, /* Data alignment factor: -4 */
5963 8, /* Return address column */
5964 1, /* Augmentation size */
5965 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
5966 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
5967 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
5968 DW_CFA_nop, DW_CFA_nop,
5969
5970 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5971 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5972 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5973 0, 0, 0, 0, /* .plt size goes here */
5974 0, /* Augmentation size */
5975 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5976 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5977 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5978 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5979 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5980 13, /* Block length */
5981 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5982 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5983 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5984 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5985 DW_CFA_nop, DW_CFA_nop
5986 };
5987
5988 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
5989 {
5990 elf_i386_nacl_plt0_entry, /* plt0_entry */
5991 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5992 2, /* plt0_got1_offset */
5993 8, /* plt0_got2_offset */
5994 elf_i386_nacl_plt_entry, /* plt_entry */
5995 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5996 2, /* plt_got_offset */
5997 33, /* plt_reloc_offset */
5998 38, /* plt_plt_offset */
5999 32, /* plt_lazy_offset */
6000 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6001 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6002 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6003 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6004 };
6005
6006 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6007 {
6008 &elf_i386_nacl_plt, /* plt */
6009 0x90, /* plt0_pad_byte: nop insn */
6010 0, /* is_vxworks */
6011 };
6012
6013 static bfd_boolean
6014 elf32_i386_nacl_elf_object_p (bfd *abfd)
6015 {
6016 /* Set the right machine number for a NaCl i386 ELF32 file. */
6017 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6018 return TRUE;
6019 }
6020
6021 #undef elf_backend_arch_data
6022 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6023
6024 #undef elf_backend_object_p
6025 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6026 #undef elf_backend_modify_segment_map
6027 #define elf_backend_modify_segment_map nacl_modify_segment_map
6028 #undef elf_backend_modify_program_headers
6029 #define elf_backend_modify_program_headers nacl_modify_program_headers
6030 #undef elf_backend_final_write_processing
6031 #define elf_backend_final_write_processing nacl_final_write_processing
6032
6033 #include "elf32-target.h"
6034
6035 /* Restore defaults. */
6036 #undef elf_backend_object_p
6037 #undef elf_backend_modify_segment_map
6038 #undef elf_backend_modify_program_headers
6039 #undef elf_backend_final_write_processing
6040
6041 /* VxWorks support. */
6042
6043 #undef TARGET_LITTLE_SYM
6044 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6045 #undef TARGET_LITTLE_NAME
6046 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6047 #undef ELF_OSABI
6048 #undef elf_backend_plt_alignment
6049 #define elf_backend_plt_alignment 4
6050
6051 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6052 {
6053 &elf_i386_plt, /* plt */
6054 0x90, /* plt0_pad_byte */
6055 1, /* is_vxworks */
6056 };
6057
6058 #undef elf_backend_arch_data
6059 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6060
6061 #undef elf_backend_relocs_compatible
6062 #undef elf_backend_add_symbol_hook
6063 #define elf_backend_add_symbol_hook \
6064 elf_vxworks_add_symbol_hook
6065 #undef elf_backend_link_output_symbol_hook
6066 #define elf_backend_link_output_symbol_hook \
6067 elf_vxworks_link_output_symbol_hook
6068 #undef elf_backend_emit_relocs
6069 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6070 #undef elf_backend_final_write_processing
6071 #define elf_backend_final_write_processing \
6072 elf_vxworks_final_write_processing
6073 #undef elf_backend_static_tls_alignment
6074
6075 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6076 define it. */
6077 #undef elf_backend_want_plt_sym
6078 #define elf_backend_want_plt_sym 1
6079
6080 #undef elf32_bed
6081 #define elf32_bed elf32_i386_vxworks_bed
6082
6083 #include "elf32-target.h"
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