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Properly move kept relocations when deleting relocations
[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2015 Free Software Foundation, Inc.
3
4 This file is part of BFD, the Binary File Descriptor library.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
19 MA 02110-1301, USA. */
20
21 #include "sysdep.h"
22 #include "bfd.h"
23 #include "bfdlink.h"
24 #include "libbfd.h"
25 #include "elf-bfd.h"
26 #include "elf-nacl.h"
27 #include "elf-vxworks.h"
28 #include "bfd_stdint.h"
29 #include "objalloc.h"
30 #include "hashtab.h"
31 #include "dwarf2.h"
32 #include "opcode/i386.h"
33
34 /* 386 uses REL relocations instead of RELA. */
35 #define USE_REL 1
36
37 #include "elf/i386.h"
38
39 static reloc_howto_type elf_howto_table[]=
40 {
41 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
42 bfd_elf_generic_reloc, "R_386_NONE",
43 TRUE, 0x00000000, 0x00000000, FALSE),
44 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
45 bfd_elf_generic_reloc, "R_386_32",
46 TRUE, 0xffffffff, 0xffffffff, FALSE),
47 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
48 bfd_elf_generic_reloc, "R_386_PC32",
49 TRUE, 0xffffffff, 0xffffffff, TRUE),
50 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
51 bfd_elf_generic_reloc, "R_386_GOT32",
52 TRUE, 0xffffffff, 0xffffffff, FALSE),
53 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
54 bfd_elf_generic_reloc, "R_386_PLT32",
55 TRUE, 0xffffffff, 0xffffffff, TRUE),
56 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
57 bfd_elf_generic_reloc, "R_386_COPY",
58 TRUE, 0xffffffff, 0xffffffff, FALSE),
59 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
60 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
61 TRUE, 0xffffffff, 0xffffffff, FALSE),
62 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
63 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
64 TRUE, 0xffffffff, 0xffffffff, FALSE),
65 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
66 bfd_elf_generic_reloc, "R_386_RELATIVE",
67 TRUE, 0xffffffff, 0xffffffff, FALSE),
68 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
69 bfd_elf_generic_reloc, "R_386_GOTOFF",
70 TRUE, 0xffffffff, 0xffffffff, FALSE),
71 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
72 bfd_elf_generic_reloc, "R_386_GOTPC",
73 TRUE, 0xffffffff, 0xffffffff, TRUE),
74
75 /* We have a gap in the reloc numbers here.
76 R_386_standard counts the number up to this point, and
77 R_386_ext_offset is the value to subtract from a reloc type of
78 R_386_16 thru R_386_PC8 to form an index into this table. */
79 #define R_386_standard (R_386_GOTPC + 1)
80 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
81
82 /* These relocs are a GNU extension. */
83 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
84 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
85 TRUE, 0xffffffff, 0xffffffff, FALSE),
86 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
87 bfd_elf_generic_reloc, "R_386_TLS_IE",
88 TRUE, 0xffffffff, 0xffffffff, FALSE),
89 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
90 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
91 TRUE, 0xffffffff, 0xffffffff, FALSE),
92 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
93 bfd_elf_generic_reloc, "R_386_TLS_LE",
94 TRUE, 0xffffffff, 0xffffffff, FALSE),
95 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
96 bfd_elf_generic_reloc, "R_386_TLS_GD",
97 TRUE, 0xffffffff, 0xffffffff, FALSE),
98 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
99 bfd_elf_generic_reloc, "R_386_TLS_LDM",
100 TRUE, 0xffffffff, 0xffffffff, FALSE),
101 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
102 bfd_elf_generic_reloc, "R_386_16",
103 TRUE, 0xffff, 0xffff, FALSE),
104 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
105 bfd_elf_generic_reloc, "R_386_PC16",
106 TRUE, 0xffff, 0xffff, TRUE),
107 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
108 bfd_elf_generic_reloc, "R_386_8",
109 TRUE, 0xff, 0xff, FALSE),
110 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
111 bfd_elf_generic_reloc, "R_386_PC8",
112 TRUE, 0xff, 0xff, TRUE),
113
114 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
115 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
116 /* These are common with Solaris TLS implementation. */
117 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
118 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
119 TRUE, 0xffffffff, 0xffffffff, FALSE),
120 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
121 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
122 TRUE, 0xffffffff, 0xffffffff, FALSE),
123 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
124 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
125 TRUE, 0xffffffff, 0xffffffff, FALSE),
126 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
127 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
128 TRUE, 0xffffffff, 0xffffffff, FALSE),
129 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
130 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
131 TRUE, 0xffffffff, 0xffffffff, FALSE),
132 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
133 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
134 TRUE, 0xffffffff, 0xffffffff, FALSE),
135 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
136 bfd_elf_generic_reloc, "R_386_SIZE32",
137 TRUE, 0xffffffff, 0xffffffff, FALSE),
138 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
139 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
140 TRUE, 0xffffffff, 0xffffffff, FALSE),
141 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
142 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
143 FALSE, 0, 0, FALSE),
144 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
145 bfd_elf_generic_reloc, "R_386_TLS_DESC",
146 TRUE, 0xffffffff, 0xffffffff, FALSE),
147 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
148 bfd_elf_generic_reloc, "R_386_IRELATIVE",
149 TRUE, 0xffffffff, 0xffffffff, FALSE),
150 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
151 bfd_elf_generic_reloc, "R_386_GOT32X",
152 TRUE, 0xffffffff, 0xffffffff, FALSE),
153
154 /* Another gap. */
155 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
156 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
157
158 /* GNU extension to record C++ vtable hierarchy. */
159 HOWTO (R_386_GNU_VTINHERIT, /* type */
160 0, /* rightshift */
161 2, /* size (0 = byte, 1 = short, 2 = long) */
162 0, /* bitsize */
163 FALSE, /* pc_relative */
164 0, /* bitpos */
165 complain_overflow_dont, /* complain_on_overflow */
166 NULL, /* special_function */
167 "R_386_GNU_VTINHERIT", /* name */
168 FALSE, /* partial_inplace */
169 0, /* src_mask */
170 0, /* dst_mask */
171 FALSE), /* pcrel_offset */
172
173 /* GNU extension to record C++ vtable member usage. */
174 HOWTO (R_386_GNU_VTENTRY, /* type */
175 0, /* rightshift */
176 2, /* size (0 = byte, 1 = short, 2 = long) */
177 0, /* bitsize */
178 FALSE, /* pc_relative */
179 0, /* bitpos */
180 complain_overflow_dont, /* complain_on_overflow */
181 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
182 "R_386_GNU_VTENTRY", /* name */
183 FALSE, /* partial_inplace */
184 0, /* src_mask */
185 0, /* dst_mask */
186 FALSE) /* pcrel_offset */
187
188 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
189
190 };
191
192 #ifdef DEBUG_GEN_RELOC
193 #define TRACE(str) \
194 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
195 #else
196 #define TRACE(str)
197 #endif
198
199 static reloc_howto_type *
200 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
201 bfd_reloc_code_real_type code)
202 {
203 switch (code)
204 {
205 case BFD_RELOC_NONE:
206 TRACE ("BFD_RELOC_NONE");
207 return &elf_howto_table[R_386_NONE];
208
209 case BFD_RELOC_32:
210 TRACE ("BFD_RELOC_32");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_CTOR:
214 TRACE ("BFD_RELOC_CTOR");
215 return &elf_howto_table[R_386_32];
216
217 case BFD_RELOC_32_PCREL:
218 TRACE ("BFD_RELOC_PC32");
219 return &elf_howto_table[R_386_PC32];
220
221 case BFD_RELOC_386_GOT32:
222 TRACE ("BFD_RELOC_386_GOT32");
223 return &elf_howto_table[R_386_GOT32];
224
225 case BFD_RELOC_386_PLT32:
226 TRACE ("BFD_RELOC_386_PLT32");
227 return &elf_howto_table[R_386_PLT32];
228
229 case BFD_RELOC_386_COPY:
230 TRACE ("BFD_RELOC_386_COPY");
231 return &elf_howto_table[R_386_COPY];
232
233 case BFD_RELOC_386_GLOB_DAT:
234 TRACE ("BFD_RELOC_386_GLOB_DAT");
235 return &elf_howto_table[R_386_GLOB_DAT];
236
237 case BFD_RELOC_386_JUMP_SLOT:
238 TRACE ("BFD_RELOC_386_JUMP_SLOT");
239 return &elf_howto_table[R_386_JUMP_SLOT];
240
241 case BFD_RELOC_386_RELATIVE:
242 TRACE ("BFD_RELOC_386_RELATIVE");
243 return &elf_howto_table[R_386_RELATIVE];
244
245 case BFD_RELOC_386_GOTOFF:
246 TRACE ("BFD_RELOC_386_GOTOFF");
247 return &elf_howto_table[R_386_GOTOFF];
248
249 case BFD_RELOC_386_GOTPC:
250 TRACE ("BFD_RELOC_386_GOTPC");
251 return &elf_howto_table[R_386_GOTPC];
252
253 /* These relocs are a GNU extension. */
254 case BFD_RELOC_386_TLS_TPOFF:
255 TRACE ("BFD_RELOC_386_TLS_TPOFF");
256 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_IE:
259 TRACE ("BFD_RELOC_386_TLS_IE");
260 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_GOTIE:
263 TRACE ("BFD_RELOC_386_TLS_GOTIE");
264 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_LE:
267 TRACE ("BFD_RELOC_386_TLS_LE");
268 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_GD:
271 TRACE ("BFD_RELOC_386_TLS_GD");
272 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
273
274 case BFD_RELOC_386_TLS_LDM:
275 TRACE ("BFD_RELOC_386_TLS_LDM");
276 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
277
278 case BFD_RELOC_16:
279 TRACE ("BFD_RELOC_16");
280 return &elf_howto_table[R_386_16 - R_386_ext_offset];
281
282 case BFD_RELOC_16_PCREL:
283 TRACE ("BFD_RELOC_16_PCREL");
284 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
285
286 case BFD_RELOC_8:
287 TRACE ("BFD_RELOC_8");
288 return &elf_howto_table[R_386_8 - R_386_ext_offset];
289
290 case BFD_RELOC_8_PCREL:
291 TRACE ("BFD_RELOC_8_PCREL");
292 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
293
294 /* Common with Sun TLS implementation. */
295 case BFD_RELOC_386_TLS_LDO_32:
296 TRACE ("BFD_RELOC_386_TLS_LDO_32");
297 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_IE_32:
300 TRACE ("BFD_RELOC_386_TLS_IE_32");
301 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_LE_32:
304 TRACE ("BFD_RELOC_386_TLS_LE_32");
305 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPMOD32:
308 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
309 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_DTPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
313 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_386_TLS_TPOFF32:
316 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
317 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
318
319 case BFD_RELOC_SIZE32:
320 TRACE ("BFD_RELOC_SIZE32");
321 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_GOTDESC:
324 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
325 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC_CALL:
328 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
329 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
330
331 case BFD_RELOC_386_TLS_DESC:
332 TRACE ("BFD_RELOC_386_TLS_DESC");
333 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
334
335 case BFD_RELOC_386_IRELATIVE:
336 TRACE ("BFD_RELOC_386_IRELATIVE");
337 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
338
339 case BFD_RELOC_386_GOT32X:
340 TRACE ("BFD_RELOC_386_GOT32X");
341 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
342
343 case BFD_RELOC_VTABLE_INHERIT:
344 TRACE ("BFD_RELOC_VTABLE_INHERIT");
345 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
346
347 case BFD_RELOC_VTABLE_ENTRY:
348 TRACE ("BFD_RELOC_VTABLE_ENTRY");
349 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
350
351 default:
352 break;
353 }
354
355 TRACE ("Unknown");
356 return 0;
357 }
358
359 static reloc_howto_type *
360 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
361 const char *r_name)
362 {
363 unsigned int i;
364
365 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
366 if (elf_howto_table[i].name != NULL
367 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
368 return &elf_howto_table[i];
369
370 return NULL;
371 }
372
373 static reloc_howto_type *
374 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
375 {
376 unsigned int indx;
377
378 if ((indx = r_type) >= R_386_standard
379 && ((indx = r_type - R_386_ext_offset) - R_386_standard
380 >= R_386_ext - R_386_standard)
381 && ((indx = r_type - R_386_tls_offset) - R_386_ext
382 >= R_386_ext2 - R_386_ext)
383 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
384 >= R_386_vt - R_386_ext2))
385 {
386 (*_bfd_error_handler) (_("%B: invalid relocation type %d"),
387 abfd, (int) r_type);
388 indx = R_386_NONE;
389 }
390 /* PR 17512: file: 0f67f69d. */
391 if (elf_howto_table [indx].type != r_type)
392 return NULL;
393 return &elf_howto_table[indx];
394 }
395
396 static void
397 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
398 arelent *cache_ptr,
399 Elf_Internal_Rela *dst)
400 {
401 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
402 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
403 }
404
405 /* Return whether a symbol name implies a local label. The UnixWare
406 2.1 cc generates temporary symbols that start with .X, so we
407 recognize them here. FIXME: do other SVR4 compilers also use .X?.
408 If so, we should move the .X recognition into
409 _bfd_elf_is_local_label_name. */
410
411 static bfd_boolean
412 elf_i386_is_local_label_name (bfd *abfd, const char *name)
413 {
414 if (name[0] == '.' && name[1] == 'X')
415 return TRUE;
416
417 return _bfd_elf_is_local_label_name (abfd, name);
418 }
419 \f
420 /* Support for core dump NOTE sections. */
421
422 static bfd_boolean
423 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
424 {
425 int offset;
426 size_t size;
427
428 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
429 {
430 int pr_version = bfd_get_32 (abfd, note->descdata);
431
432 if (pr_version != 1)
433 return FALSE;
434
435 /* pr_cursig */
436 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
437
438 /* pr_pid */
439 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
440
441 /* pr_reg */
442 offset = 28;
443 size = bfd_get_32 (abfd, note->descdata + 8);
444 }
445 else
446 {
447 switch (note->descsz)
448 {
449 default:
450 return FALSE;
451
452 case 144: /* Linux/i386 */
453 /* pr_cursig */
454 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
455
456 /* pr_pid */
457 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
458
459 /* pr_reg */
460 offset = 72;
461 size = 68;
462
463 break;
464 }
465 }
466
467 /* Make a ".reg/999" section. */
468 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
469 size, note->descpos + offset);
470 }
471
472 static bfd_boolean
473 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
474 {
475 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
476 {
477 int pr_version = bfd_get_32 (abfd, note->descdata);
478
479 if (pr_version != 1)
480 return FALSE;
481
482 elf_tdata (abfd)->core->program
483 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
484 elf_tdata (abfd)->core->command
485 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
486 }
487 else
488 {
489 switch (note->descsz)
490 {
491 default:
492 return FALSE;
493
494 case 124: /* Linux/i386 elf_prpsinfo. */
495 elf_tdata (abfd)->core->pid
496 = bfd_get_32 (abfd, note->descdata + 12);
497 elf_tdata (abfd)->core->program
498 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
499 elf_tdata (abfd)->core->command
500 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
501 }
502 }
503
504 /* Note that for some reason, a spurious space is tacked
505 onto the end of the args in some (at least one anyway)
506 implementations, so strip it off if it exists. */
507 {
508 char *command = elf_tdata (abfd)->core->command;
509 int n = strlen (command);
510
511 if (0 < n && command[n - 1] == ' ')
512 command[n - 1] = '\0';
513 }
514
515 return TRUE;
516 }
517 \f
518 /* Functions for the i386 ELF linker.
519
520 In order to gain some understanding of code in this file without
521 knowing all the intricate details of the linker, note the
522 following:
523
524 Functions named elf_i386_* are called by external routines, other
525 functions are only called locally. elf_i386_* functions appear
526 in this file more or less in the order in which they are called
527 from external routines. eg. elf_i386_check_relocs is called
528 early in the link process, elf_i386_finish_dynamic_sections is
529 one of the last functions. */
530
531
532 /* The name of the dynamic interpreter. This is put in the .interp
533 section. */
534
535 #define ELF_DYNAMIC_INTERPRETER "/usr/lib/libc.so.1"
536
537 /* If ELIMINATE_COPY_RELOCS is non-zero, the linker will try to avoid
538 copying dynamic variables from a shared lib into an app's dynbss
539 section, and instead use a dynamic relocation to point into the
540 shared lib. */
541 #define ELIMINATE_COPY_RELOCS 1
542
543 /* The size in bytes of an entry in the procedure linkage table. */
544
545 #define PLT_ENTRY_SIZE 16
546
547 /* The first entry in an absolute procedure linkage table looks like
548 this. See the SVR4 ABI i386 supplement to see how this works.
549 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
550
551 static const bfd_byte elf_i386_plt0_entry[12] =
552 {
553 0xff, 0x35, /* pushl contents of address */
554 0, 0, 0, 0, /* replaced with address of .got + 4. */
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0 /* replaced with address of .got + 8. */
557 };
558
559 /* Subsequent entries in an absolute procedure linkage table look like
560 this. */
561
562 static const bfd_byte elf_i386_plt_entry[PLT_ENTRY_SIZE] =
563 {
564 0xff, 0x25, /* jmp indirect */
565 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
566 0x68, /* pushl immediate */
567 0, 0, 0, 0, /* replaced with offset into relocation table. */
568 0xe9, /* jmp relative */
569 0, 0, 0, 0 /* replaced with offset to start of .plt. */
570 };
571
572 /* The first entry in a PIC procedure linkage table look like this.
573 Will be padded to PLT_ENTRY_SIZE with htab->plt0_pad_byte. */
574
575 static const bfd_byte elf_i386_pic_plt0_entry[12] =
576 {
577 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
578 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
579 };
580
581 /* Subsequent entries in a PIC procedure linkage table look like this. */
582
583 static const bfd_byte elf_i386_pic_plt_entry[PLT_ENTRY_SIZE] =
584 {
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
591 };
592
593 /* Entries in the GOT procedure linkage table look like this. */
594
595 static const bfd_byte elf_i386_got_plt_entry[8] =
596 {
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
600 };
601
602 /* Entries in the PIC GOT procedure linkage table look like this. */
603
604 static const bfd_byte elf_i386_pic_got_plt_entry[8] =
605 {
606 0xff, 0xa3, /* jmp *offset(%ebx) */
607 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
608 0x66, 0x90 /* xchg %ax,%ax */
609 };
610
611 /* .eh_frame covering the .plt section. */
612
613 static const bfd_byte elf_i386_eh_frame_plt[] =
614 {
615 #define PLT_CIE_LENGTH 20
616 #define PLT_FDE_LENGTH 36
617 #define PLT_FDE_START_OFFSET 4 + PLT_CIE_LENGTH + 8
618 #define PLT_FDE_LEN_OFFSET 4 + PLT_CIE_LENGTH + 12
619 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
620 0, 0, 0, 0, /* CIE ID */
621 1, /* CIE version */
622 'z', 'R', 0, /* Augmentation string */
623 1, /* Code alignment factor */
624 0x7c, /* Data alignment factor */
625 8, /* Return address column */
626 1, /* Augmentation size */
627 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
628 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
629 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
630 DW_CFA_nop, DW_CFA_nop,
631
632 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
633 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
634 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
635 0, 0, 0, 0, /* .plt size goes here */
636 0, /* Augmentation size */
637 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
638 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
639 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
640 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
641 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
642 11, /* Block length */
643 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
644 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
645 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
646 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
647 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
648 };
649
650 struct elf_i386_plt_layout
651 {
652 /* The first entry in an absolute procedure linkage table looks like this. */
653 const bfd_byte *plt0_entry;
654 unsigned int plt0_entry_size;
655
656 /* Offsets into plt0_entry that are to be replaced with GOT[1] and GOT[2]. */
657 unsigned int plt0_got1_offset;
658 unsigned int plt0_got2_offset;
659
660 /* Later entries in an absolute procedure linkage table look like this. */
661 const bfd_byte *plt_entry;
662 unsigned int plt_entry_size;
663
664 /* Offsets into plt_entry that are to be replaced with... */
665 unsigned int plt_got_offset; /* ... address of this symbol in .got. */
666 unsigned int plt_reloc_offset; /* ... offset into relocation table. */
667 unsigned int plt_plt_offset; /* ... offset to start of .plt. */
668
669 /* Offset into plt_entry where the initial value of the GOT entry points. */
670 unsigned int plt_lazy_offset;
671
672 /* The first entry in a PIC procedure linkage table looks like this. */
673 const bfd_byte *pic_plt0_entry;
674
675 /* Subsequent entries in a PIC procedure linkage table look like this. */
676 const bfd_byte *pic_plt_entry;
677
678 /* .eh_frame covering the .plt section. */
679 const bfd_byte *eh_frame_plt;
680 unsigned int eh_frame_plt_size;
681 };
682
683 #define GET_PLT_ENTRY_SIZE(abfd) \
684 get_elf_i386_backend_data (abfd)->plt->plt_entry_size
685
686 /* These are the standard parameters. */
687 static const struct elf_i386_plt_layout elf_i386_plt =
688 {
689 elf_i386_plt0_entry, /* plt0_entry */
690 sizeof (elf_i386_plt0_entry), /* plt0_entry_size */
691 2, /* plt0_got1_offset */
692 8, /* plt0_got2_offset */
693 elf_i386_plt_entry, /* plt_entry */
694 PLT_ENTRY_SIZE, /* plt_entry_size */
695 2, /* plt_got_offset */
696 7, /* plt_reloc_offset */
697 12, /* plt_plt_offset */
698 6, /* plt_lazy_offset */
699 elf_i386_pic_plt0_entry, /* pic_plt0_entry */
700 elf_i386_pic_plt_entry, /* pic_plt_entry */
701 elf_i386_eh_frame_plt, /* eh_frame_plt */
702 sizeof (elf_i386_eh_frame_plt), /* eh_frame_plt_size */
703 };
704 \f
705
706 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
707 for the PLTResolve stub and then for each PLT entry. */
708 #define PLTRESOLVE_RELOCS_SHLIB 0
709 #define PLTRESOLVE_RELOCS 2
710 #define PLT_NON_JUMP_SLOT_RELOCS 2
711
712 /* Architecture-specific backend data for i386. */
713
714 struct elf_i386_backend_data
715 {
716 /* Parameters describing PLT generation. */
717 const struct elf_i386_plt_layout *plt;
718
719 /* Value used to fill the unused bytes of the first PLT entry. */
720 bfd_byte plt0_pad_byte;
721
722 /* True if the target system is VxWorks. */
723 int is_vxworks;
724 };
725
726 #define get_elf_i386_backend_data(abfd) \
727 ((const struct elf_i386_backend_data *) \
728 get_elf_backend_data (abfd)->arch_data)
729
730 /* These are the standard parameters. */
731 static const struct elf_i386_backend_data elf_i386_arch_bed =
732 {
733 &elf_i386_plt, /* plt */
734 0, /* plt0_pad_byte */
735 0, /* is_vxworks */
736 };
737
738 #define elf_backend_arch_data &elf_i386_arch_bed
739
740 /* i386 ELF linker hash entry. */
741
742 struct elf_i386_link_hash_entry
743 {
744 struct elf_link_hash_entry elf;
745
746 /* Track dynamic relocs copied for this symbol. */
747 struct elf_dyn_relocs *dyn_relocs;
748
749 #define GOT_UNKNOWN 0
750 #define GOT_NORMAL 1
751 #define GOT_TLS_GD 2
752 #define GOT_TLS_IE 4
753 #define GOT_TLS_IE_POS 5
754 #define GOT_TLS_IE_NEG 6
755 #define GOT_TLS_IE_BOTH 7
756 #define GOT_TLS_GDESC 8
757 #define GOT_TLS_GD_BOTH_P(type) \
758 ((type) == (GOT_TLS_GD | GOT_TLS_GDESC))
759 #define GOT_TLS_GD_P(type) \
760 ((type) == GOT_TLS_GD || GOT_TLS_GD_BOTH_P (type))
761 #define GOT_TLS_GDESC_P(type) \
762 ((type) == GOT_TLS_GDESC || GOT_TLS_GD_BOTH_P (type))
763 #define GOT_TLS_GD_ANY_P(type) \
764 (GOT_TLS_GD_P (type) || GOT_TLS_GDESC_P (type))
765 unsigned char tls_type;
766
767 /* Symbol is referenced by R_386_GOTOFF relocation. */
768 unsigned int gotoff_ref : 1;
769
770 /* Reference count of C/C++ function pointer relocations in read-write
771 section which can be resolved at run-time. */
772 bfd_signed_vma func_pointer_refcount;
773
774 /* Information about the GOT PLT entry. Filled when there are both
775 GOT and PLT relocations against the same function. */
776 union gotplt_union plt_got;
777
778 /* Offset of the GOTPLT entry reserved for the TLS descriptor,
779 starting at the end of the jump table. */
780 bfd_vma tlsdesc_got;
781 };
782
783 #define elf_i386_hash_entry(ent) ((struct elf_i386_link_hash_entry *)(ent))
784
785 struct elf_i386_obj_tdata
786 {
787 struct elf_obj_tdata root;
788
789 /* tls_type for each local got entry. */
790 char *local_got_tls_type;
791
792 /* GOTPLT entries for TLS descriptors. */
793 bfd_vma *local_tlsdesc_gotent;
794 };
795
796 #define elf_i386_tdata(abfd) \
797 ((struct elf_i386_obj_tdata *) (abfd)->tdata.any)
798
799 #define elf_i386_local_got_tls_type(abfd) \
800 (elf_i386_tdata (abfd)->local_got_tls_type)
801
802 #define elf_i386_local_tlsdesc_gotent(abfd) \
803 (elf_i386_tdata (abfd)->local_tlsdesc_gotent)
804
805 #define is_i386_elf(bfd) \
806 (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
807 && elf_tdata (bfd) != NULL \
808 && elf_object_id (bfd) == I386_ELF_DATA)
809
810 static bfd_boolean
811 elf_i386_mkobject (bfd *abfd)
812 {
813 return bfd_elf_allocate_object (abfd, sizeof (struct elf_i386_obj_tdata),
814 I386_ELF_DATA);
815 }
816
817 /* i386 ELF linker hash table. */
818
819 struct elf_i386_link_hash_table
820 {
821 struct elf_link_hash_table elf;
822
823 /* Short-cuts to get to dynamic linker sections. */
824 asection *sdynbss;
825 asection *srelbss;
826 asection *plt_eh_frame;
827 asection *plt_got;
828
829 union
830 {
831 bfd_signed_vma refcount;
832 bfd_vma offset;
833 } tls_ldm_got;
834
835 /* The amount of space used by the reserved portion of the sgotplt
836 section, plus whatever space is used by the jump slots. */
837 bfd_vma sgotplt_jump_table_size;
838
839 /* Small local sym cache. */
840 struct sym_cache sym_cache;
841
842 /* _TLS_MODULE_BASE_ symbol. */
843 struct bfd_link_hash_entry *tls_module_base;
844
845 /* Used by local STT_GNU_IFUNC symbols. */
846 htab_t loc_hash_table;
847 void * loc_hash_memory;
848
849 /* The (unloaded but important) .rel.plt.unloaded section on VxWorks. */
850 asection *srelplt2;
851
852 /* The index of the next unused R_386_TLS_DESC slot in .rel.plt. */
853 bfd_vma next_tls_desc_index;
854
855 /* The index of the next unused R_386_JUMP_SLOT slot in .rel.plt. */
856 bfd_vma next_jump_slot_index;
857
858 /* The index of the next unused R_386_IRELATIVE slot in .rel.plt. */
859 bfd_vma next_irelative_index;
860 };
861
862 /* Get the i386 ELF linker hash table from a link_info structure. */
863
864 #define elf_i386_hash_table(p) \
865 (elf_hash_table_id ((struct elf_link_hash_table *) ((p)->hash)) \
866 == I386_ELF_DATA ? ((struct elf_i386_link_hash_table *) ((p)->hash)) : NULL)
867
868 #define elf_i386_compute_jump_table_size(htab) \
869 ((htab)->elf.srelplt->reloc_count * 4)
870
871 /* Create an entry in an i386 ELF linker hash table. */
872
873 static struct bfd_hash_entry *
874 elf_i386_link_hash_newfunc (struct bfd_hash_entry *entry,
875 struct bfd_hash_table *table,
876 const char *string)
877 {
878 /* Allocate the structure if it has not already been allocated by a
879 subclass. */
880 if (entry == NULL)
881 {
882 entry = (struct bfd_hash_entry *)
883 bfd_hash_allocate (table, sizeof (struct elf_i386_link_hash_entry));
884 if (entry == NULL)
885 return entry;
886 }
887
888 /* Call the allocation method of the superclass. */
889 entry = _bfd_elf_link_hash_newfunc (entry, table, string);
890 if (entry != NULL)
891 {
892 struct elf_i386_link_hash_entry *eh;
893
894 eh = (struct elf_i386_link_hash_entry *) entry;
895 eh->dyn_relocs = NULL;
896 eh->tls_type = GOT_UNKNOWN;
897 eh->gotoff_ref = 0;
898 eh->func_pointer_refcount = 0;
899 eh->plt_got.offset = (bfd_vma) -1;
900 eh->tlsdesc_got = (bfd_vma) -1;
901 }
902
903 return entry;
904 }
905
906 /* Compute a hash of a local hash entry. We use elf_link_hash_entry
907 for local symbol so that we can handle local STT_GNU_IFUNC symbols
908 as global symbol. We reuse indx and dynstr_index for local symbol
909 hash since they aren't used by global symbols in this backend. */
910
911 static hashval_t
912 elf_i386_local_htab_hash (const void *ptr)
913 {
914 struct elf_link_hash_entry *h
915 = (struct elf_link_hash_entry *) ptr;
916 return ELF_LOCAL_SYMBOL_HASH (h->indx, h->dynstr_index);
917 }
918
919 /* Compare local hash entries. */
920
921 static int
922 elf_i386_local_htab_eq (const void *ptr1, const void *ptr2)
923 {
924 struct elf_link_hash_entry *h1
925 = (struct elf_link_hash_entry *) ptr1;
926 struct elf_link_hash_entry *h2
927 = (struct elf_link_hash_entry *) ptr2;
928
929 return h1->indx == h2->indx && h1->dynstr_index == h2->dynstr_index;
930 }
931
932 /* Find and/or create a hash entry for local symbol. */
933
934 static struct elf_link_hash_entry *
935 elf_i386_get_local_sym_hash (struct elf_i386_link_hash_table *htab,
936 bfd *abfd, const Elf_Internal_Rela *rel,
937 bfd_boolean create)
938 {
939 struct elf_i386_link_hash_entry e, *ret;
940 asection *sec = abfd->sections;
941 hashval_t h = ELF_LOCAL_SYMBOL_HASH (sec->id,
942 ELF32_R_SYM (rel->r_info));
943 void **slot;
944
945 e.elf.indx = sec->id;
946 e.elf.dynstr_index = ELF32_R_SYM (rel->r_info);
947 slot = htab_find_slot_with_hash (htab->loc_hash_table, &e, h,
948 create ? INSERT : NO_INSERT);
949
950 if (!slot)
951 return NULL;
952
953 if (*slot)
954 {
955 ret = (struct elf_i386_link_hash_entry *) *slot;
956 return &ret->elf;
957 }
958
959 ret = (struct elf_i386_link_hash_entry *)
960 objalloc_alloc ((struct objalloc *) htab->loc_hash_memory,
961 sizeof (struct elf_i386_link_hash_entry));
962 if (ret)
963 {
964 memset (ret, 0, sizeof (*ret));
965 ret->elf.indx = sec->id;
966 ret->elf.dynstr_index = ELF32_R_SYM (rel->r_info);
967 ret->elf.dynindx = -1;
968 ret->func_pointer_refcount = 0;
969 ret->plt_got.offset = (bfd_vma) -1;
970 *slot = ret;
971 }
972 return &ret->elf;
973 }
974
975 /* Destroy an i386 ELF linker hash table. */
976
977 static void
978 elf_i386_link_hash_table_free (bfd *obfd)
979 {
980 struct elf_i386_link_hash_table *htab
981 = (struct elf_i386_link_hash_table *) obfd->link.hash;
982
983 if (htab->loc_hash_table)
984 htab_delete (htab->loc_hash_table);
985 if (htab->loc_hash_memory)
986 objalloc_free ((struct objalloc *) htab->loc_hash_memory);
987 _bfd_elf_link_hash_table_free (obfd);
988 }
989
990 /* Create an i386 ELF linker hash table. */
991
992 static struct bfd_link_hash_table *
993 elf_i386_link_hash_table_create (bfd *abfd)
994 {
995 struct elf_i386_link_hash_table *ret;
996 bfd_size_type amt = sizeof (struct elf_i386_link_hash_table);
997
998 ret = (struct elf_i386_link_hash_table *) bfd_zmalloc (amt);
999 if (ret == NULL)
1000 return NULL;
1001
1002 if (!_bfd_elf_link_hash_table_init (&ret->elf, abfd,
1003 elf_i386_link_hash_newfunc,
1004 sizeof (struct elf_i386_link_hash_entry),
1005 I386_ELF_DATA))
1006 {
1007 free (ret);
1008 return NULL;
1009 }
1010
1011 ret->loc_hash_table = htab_try_create (1024,
1012 elf_i386_local_htab_hash,
1013 elf_i386_local_htab_eq,
1014 NULL);
1015 ret->loc_hash_memory = objalloc_create ();
1016 if (!ret->loc_hash_table || !ret->loc_hash_memory)
1017 {
1018 elf_i386_link_hash_table_free (abfd);
1019 return NULL;
1020 }
1021 ret->elf.root.hash_table_free = elf_i386_link_hash_table_free;
1022
1023 return &ret->elf.root;
1024 }
1025
1026 /* Create .plt, .rel.plt, .got, .got.plt, .rel.got, .dynbss, and
1027 .rel.bss sections in DYNOBJ, and set up shortcuts to them in our
1028 hash table. */
1029
1030 static bfd_boolean
1031 elf_i386_create_dynamic_sections (bfd *dynobj, struct bfd_link_info *info)
1032 {
1033 struct elf_i386_link_hash_table *htab;
1034
1035 if (!_bfd_elf_create_dynamic_sections (dynobj, info))
1036 return FALSE;
1037
1038 htab = elf_i386_hash_table (info);
1039 if (htab == NULL)
1040 return FALSE;
1041
1042 htab->sdynbss = bfd_get_linker_section (dynobj, ".dynbss");
1043 if (!htab->sdynbss)
1044 abort ();
1045
1046 if (bfd_link_executable (info))
1047 {
1048 /* Always allow copy relocs for building executables. */
1049 asection *s = bfd_get_linker_section (dynobj, ".rel.bss");
1050 if (s == NULL)
1051 {
1052 const struct elf_backend_data *bed = get_elf_backend_data (dynobj);
1053 s = bfd_make_section_anyway_with_flags (dynobj,
1054 ".rel.bss",
1055 (bed->dynamic_sec_flags
1056 | SEC_READONLY));
1057 if (s == NULL
1058 || ! bfd_set_section_alignment (dynobj, s,
1059 bed->s->log_file_align))
1060 return FALSE;
1061 }
1062 htab->srelbss = s;
1063 }
1064
1065 if (get_elf_i386_backend_data (dynobj)->is_vxworks
1066 && !elf_vxworks_create_dynamic_sections (dynobj, info,
1067 &htab->srelplt2))
1068 return FALSE;
1069
1070 if (!info->no_ld_generated_unwind_info
1071 && htab->plt_eh_frame == NULL
1072 && htab->elf.splt != NULL)
1073 {
1074 flagword flags = (SEC_ALLOC | SEC_LOAD | SEC_READONLY
1075 | SEC_HAS_CONTENTS | SEC_IN_MEMORY
1076 | SEC_LINKER_CREATED);
1077 htab->plt_eh_frame
1078 = bfd_make_section_anyway_with_flags (dynobj, ".eh_frame", flags);
1079 if (htab->plt_eh_frame == NULL
1080 || !bfd_set_section_alignment (dynobj, htab->plt_eh_frame, 2))
1081 return FALSE;
1082 }
1083
1084 return TRUE;
1085 }
1086
1087 /* Copy the extra info we tack onto an elf_link_hash_entry. */
1088
1089 static void
1090 elf_i386_copy_indirect_symbol (struct bfd_link_info *info,
1091 struct elf_link_hash_entry *dir,
1092 struct elf_link_hash_entry *ind)
1093 {
1094 struct elf_i386_link_hash_entry *edir, *eind;
1095
1096 edir = (struct elf_i386_link_hash_entry *) dir;
1097 eind = (struct elf_i386_link_hash_entry *) ind;
1098
1099 if (eind->dyn_relocs != NULL)
1100 {
1101 if (edir->dyn_relocs != NULL)
1102 {
1103 struct elf_dyn_relocs **pp;
1104 struct elf_dyn_relocs *p;
1105
1106 /* Add reloc counts against the indirect sym to the direct sym
1107 list. Merge any entries against the same section. */
1108 for (pp = &eind->dyn_relocs; (p = *pp) != NULL; )
1109 {
1110 struct elf_dyn_relocs *q;
1111
1112 for (q = edir->dyn_relocs; q != NULL; q = q->next)
1113 if (q->sec == p->sec)
1114 {
1115 q->pc_count += p->pc_count;
1116 q->count += p->count;
1117 *pp = p->next;
1118 break;
1119 }
1120 if (q == NULL)
1121 pp = &p->next;
1122 }
1123 *pp = edir->dyn_relocs;
1124 }
1125
1126 edir->dyn_relocs = eind->dyn_relocs;
1127 eind->dyn_relocs = NULL;
1128 }
1129
1130 if (ind->root.type == bfd_link_hash_indirect
1131 && dir->got.refcount <= 0)
1132 {
1133 edir->tls_type = eind->tls_type;
1134 eind->tls_type = GOT_UNKNOWN;
1135 }
1136
1137 /* Copy gotoff_ref so that elf_i386_adjust_dynamic_symbol will
1138 generate a R_386_COPY reloc. */
1139 edir->gotoff_ref |= eind->gotoff_ref;
1140
1141 if (ELIMINATE_COPY_RELOCS
1142 && ind->root.type != bfd_link_hash_indirect
1143 && dir->dynamic_adjusted)
1144 {
1145 /* If called to transfer flags for a weakdef during processing
1146 of elf_adjust_dynamic_symbol, don't copy non_got_ref.
1147 We clear it ourselves for ELIMINATE_COPY_RELOCS. */
1148 dir->ref_dynamic |= ind->ref_dynamic;
1149 dir->ref_regular |= ind->ref_regular;
1150 dir->ref_regular_nonweak |= ind->ref_regular_nonweak;
1151 dir->needs_plt |= ind->needs_plt;
1152 dir->pointer_equality_needed |= ind->pointer_equality_needed;
1153 }
1154 else
1155 {
1156 if (eind->func_pointer_refcount > 0)
1157 {
1158 edir->func_pointer_refcount += eind->func_pointer_refcount;
1159 eind->func_pointer_refcount = 0;
1160 }
1161
1162 _bfd_elf_link_hash_copy_indirect (info, dir, ind);
1163 }
1164 }
1165
1166 /* Return TRUE if the TLS access code sequence support transition
1167 from R_TYPE. */
1168
1169 static bfd_boolean
1170 elf_i386_check_tls_transition (bfd *abfd, asection *sec,
1171 bfd_byte *contents,
1172 Elf_Internal_Shdr *symtab_hdr,
1173 struct elf_link_hash_entry **sym_hashes,
1174 unsigned int r_type,
1175 const Elf_Internal_Rela *rel,
1176 const Elf_Internal_Rela *relend)
1177 {
1178 unsigned int val, type;
1179 unsigned long r_symndx;
1180 struct elf_link_hash_entry *h;
1181 bfd_vma offset;
1182
1183 /* Get the section contents. */
1184 if (contents == NULL)
1185 {
1186 if (elf_section_data (sec)->this_hdr.contents != NULL)
1187 contents = elf_section_data (sec)->this_hdr.contents;
1188 else
1189 {
1190 /* FIXME: How to better handle error condition? */
1191 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1192 return FALSE;
1193
1194 /* Cache the section contents for elf_link_input_bfd. */
1195 elf_section_data (sec)->this_hdr.contents = contents;
1196 }
1197 }
1198
1199 offset = rel->r_offset;
1200 switch (r_type)
1201 {
1202 case R_386_TLS_GD:
1203 case R_386_TLS_LDM:
1204 if (offset < 2 || (rel + 1) >= relend)
1205 return FALSE;
1206
1207 type = bfd_get_8 (abfd, contents + offset - 2);
1208 if (r_type == R_386_TLS_GD)
1209 {
1210 /* Check transition from GD access model. Only
1211 leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr
1212 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop
1213 can transit to different access model. */
1214 if ((offset + 10) > sec->size ||
1215 (type != 0x8d && type != 0x04))
1216 return FALSE;
1217
1218 val = bfd_get_8 (abfd, contents + offset - 1);
1219 if (type == 0x04)
1220 {
1221 /* leal foo@tlsgd(,%reg,1), %eax; call ___tls_get_addr */
1222 if (offset < 3)
1223 return FALSE;
1224
1225 if (bfd_get_8 (abfd, contents + offset - 3) != 0x8d)
1226 return FALSE;
1227
1228 if ((val & 0xc7) != 0x05 || val == (4 << 3))
1229 return FALSE;
1230 }
1231 else
1232 {
1233 /* leal foo@tlsgd(%reg), %eax; call ___tls_get_addr; nop */
1234 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1235 return FALSE;
1236
1237 if (bfd_get_8 (abfd, contents + offset + 9) != 0x90)
1238 return FALSE;
1239 }
1240 }
1241 else
1242 {
1243 /* Check transition from LD access model. Only
1244 leal foo@tlsgd(%reg), %eax; call ___tls_get_addr
1245 can transit to different access model. */
1246 if (type != 0x8d || (offset + 9) > sec->size)
1247 return FALSE;
1248
1249 val = bfd_get_8 (abfd, contents + offset - 1);
1250 if ((val & 0xf8) != 0x80 || (val & 7) == 4)
1251 return FALSE;
1252 }
1253
1254 if (bfd_get_8 (abfd, contents + offset + 4) != 0xe8)
1255 return FALSE;
1256
1257 r_symndx = ELF32_R_SYM (rel[1].r_info);
1258 if (r_symndx < symtab_hdr->sh_info)
1259 return FALSE;
1260
1261 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1262 /* Use strncmp to check ___tls_get_addr since ___tls_get_addr
1263 may be versioned. */
1264 return (h != NULL
1265 && h->root.root.string != NULL
1266 && (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
1267 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32)
1268 && (strncmp (h->root.root.string, "___tls_get_addr",
1269 15) == 0));
1270
1271 case R_386_TLS_IE:
1272 /* Check transition from IE access model:
1273 movl foo@indntpoff(%rip), %eax
1274 movl foo@indntpoff(%rip), %reg
1275 addl foo@indntpoff(%rip), %reg
1276 */
1277
1278 if (offset < 1 || (offset + 4) > sec->size)
1279 return FALSE;
1280
1281 /* Check "movl foo@tpoff(%rip), %eax" first. */
1282 val = bfd_get_8 (abfd, contents + offset - 1);
1283 if (val == 0xa1)
1284 return TRUE;
1285
1286 if (offset < 2)
1287 return FALSE;
1288
1289 /* Check movl|addl foo@tpoff(%rip), %reg. */
1290 type = bfd_get_8 (abfd, contents + offset - 2);
1291 return ((type == 0x8b || type == 0x03)
1292 && (val & 0xc7) == 0x05);
1293
1294 case R_386_TLS_GOTIE:
1295 case R_386_TLS_IE_32:
1296 /* Check transition from {IE_32,GOTIE} access model:
1297 subl foo@{tpoff,gontoff}(%reg1), %reg2
1298 movl foo@{tpoff,gontoff}(%reg1), %reg2
1299 addl foo@{tpoff,gontoff}(%reg1), %reg2
1300 */
1301
1302 if (offset < 2 || (offset + 4) > sec->size)
1303 return FALSE;
1304
1305 val = bfd_get_8 (abfd, contents + offset - 1);
1306 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1307 return FALSE;
1308
1309 type = bfd_get_8 (abfd, contents + offset - 2);
1310 return type == 0x8b || type == 0x2b || type == 0x03;
1311
1312 case R_386_TLS_GOTDESC:
1313 /* Check transition from GDesc access model:
1314 leal x@tlsdesc(%ebx), %eax
1315
1316 Make sure it's a leal adding ebx to a 32-bit offset
1317 into any register, although it's probably almost always
1318 going to be eax. */
1319
1320 if (offset < 2 || (offset + 4) > sec->size)
1321 return FALSE;
1322
1323 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1324 return FALSE;
1325
1326 val = bfd_get_8 (abfd, contents + offset - 1);
1327 return (val & 0xc7) == 0x83;
1328
1329 case R_386_TLS_DESC_CALL:
1330 /* Check transition from GDesc access model:
1331 call *x@tlsdesc(%rax)
1332 */
1333 if (offset + 2 <= sec->size)
1334 {
1335 /* Make sure that it's a call *x@tlsdesc(%rax). */
1336 static const unsigned char call[] = { 0xff, 0x10 };
1337 return memcmp (contents + offset, call, 2) == 0;
1338 }
1339
1340 return FALSE;
1341
1342 default:
1343 abort ();
1344 }
1345 }
1346
1347 /* Return TRUE if the TLS access transition is OK or no transition
1348 will be performed. Update R_TYPE if there is a transition. */
1349
1350 static bfd_boolean
1351 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1352 asection *sec, bfd_byte *contents,
1353 Elf_Internal_Shdr *symtab_hdr,
1354 struct elf_link_hash_entry **sym_hashes,
1355 unsigned int *r_type, int tls_type,
1356 const Elf_Internal_Rela *rel,
1357 const Elf_Internal_Rela *relend,
1358 struct elf_link_hash_entry *h,
1359 unsigned long r_symndx)
1360 {
1361 unsigned int from_type = *r_type;
1362 unsigned int to_type = from_type;
1363 bfd_boolean check = TRUE;
1364
1365 /* Skip TLS transition for functions. */
1366 if (h != NULL
1367 && (h->type == STT_FUNC
1368 || h->type == STT_GNU_IFUNC))
1369 return TRUE;
1370
1371 switch (from_type)
1372 {
1373 case R_386_TLS_GD:
1374 case R_386_TLS_GOTDESC:
1375 case R_386_TLS_DESC_CALL:
1376 case R_386_TLS_IE_32:
1377 case R_386_TLS_IE:
1378 case R_386_TLS_GOTIE:
1379 if (bfd_link_executable (info))
1380 {
1381 if (h == NULL)
1382 to_type = R_386_TLS_LE_32;
1383 else if (from_type != R_386_TLS_IE
1384 && from_type != R_386_TLS_GOTIE)
1385 to_type = R_386_TLS_IE_32;
1386 }
1387
1388 /* When we are called from elf_i386_relocate_section, CONTENTS
1389 isn't NULL and there may be additional transitions based on
1390 TLS_TYPE. */
1391 if (contents != NULL)
1392 {
1393 unsigned int new_to_type = to_type;
1394
1395 if (bfd_link_executable (info)
1396 && h != NULL
1397 && h->dynindx == -1
1398 && (tls_type & GOT_TLS_IE))
1399 new_to_type = R_386_TLS_LE_32;
1400
1401 if (to_type == R_386_TLS_GD
1402 || to_type == R_386_TLS_GOTDESC
1403 || to_type == R_386_TLS_DESC_CALL)
1404 {
1405 if (tls_type == GOT_TLS_IE_POS)
1406 new_to_type = R_386_TLS_GOTIE;
1407 else if (tls_type & GOT_TLS_IE)
1408 new_to_type = R_386_TLS_IE_32;
1409 }
1410
1411 /* We checked the transition before when we were called from
1412 elf_i386_check_relocs. We only want to check the new
1413 transition which hasn't been checked before. */
1414 check = new_to_type != to_type && from_type == to_type;
1415 to_type = new_to_type;
1416 }
1417
1418 break;
1419
1420 case R_386_TLS_LDM:
1421 if (bfd_link_executable (info))
1422 to_type = R_386_TLS_LE_32;
1423 break;
1424
1425 default:
1426 return TRUE;
1427 }
1428
1429 /* Return TRUE if there is no transition. */
1430 if (from_type == to_type)
1431 return TRUE;
1432
1433 /* Check if the transition can be performed. */
1434 if (check
1435 && ! elf_i386_check_tls_transition (abfd, sec, contents,
1436 symtab_hdr, sym_hashes,
1437 from_type, rel, relend))
1438 {
1439 reloc_howto_type *from, *to;
1440 const char *name;
1441
1442 from = elf_i386_rtype_to_howto (abfd, from_type);
1443 to = elf_i386_rtype_to_howto (abfd, to_type);
1444
1445 if (h)
1446 name = h->root.root.string;
1447 else
1448 {
1449 struct elf_i386_link_hash_table *htab;
1450
1451 htab = elf_i386_hash_table (info);
1452 if (htab == NULL)
1453 name = "*unknown*";
1454 else
1455 {
1456 Elf_Internal_Sym *isym;
1457
1458 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1459 abfd, r_symndx);
1460 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1461 }
1462 }
1463
1464 (*_bfd_error_handler)
1465 (_("%B: TLS transition from %s to %s against `%s' at 0x%lx "
1466 "in section `%A' failed"),
1467 abfd, sec, from->name, to->name, name,
1468 (unsigned long) rel->r_offset);
1469 bfd_set_error (bfd_error_bad_value);
1470 return FALSE;
1471 }
1472
1473 *r_type = to_type;
1474 return TRUE;
1475 }
1476
1477 /* Rename some of the generic section flags to better document how they
1478 are used here. */
1479 #define need_convert_load sec_flg0
1480
1481 /* Look through the relocs for a section during the first phase, and
1482 calculate needed space in the global offset table, procedure linkage
1483 table, and dynamic reloc sections. */
1484
1485 static bfd_boolean
1486 elf_i386_check_relocs (bfd *abfd,
1487 struct bfd_link_info *info,
1488 asection *sec,
1489 const Elf_Internal_Rela *relocs)
1490 {
1491 struct elf_i386_link_hash_table *htab;
1492 Elf_Internal_Shdr *symtab_hdr;
1493 struct elf_link_hash_entry **sym_hashes;
1494 const Elf_Internal_Rela *rel;
1495 const Elf_Internal_Rela *rel_end;
1496 asection *sreloc;
1497 bfd_boolean use_plt_got;
1498
1499 if (bfd_link_relocatable (info))
1500 return TRUE;
1501
1502 BFD_ASSERT (is_i386_elf (abfd));
1503
1504 htab = elf_i386_hash_table (info);
1505 if (htab == NULL)
1506 return FALSE;
1507
1508 use_plt_got = (!get_elf_i386_backend_data (abfd)->is_vxworks
1509 && (get_elf_i386_backend_data (abfd)
1510 == &elf_i386_arch_bed));
1511
1512 symtab_hdr = &elf_symtab_hdr (abfd);
1513 sym_hashes = elf_sym_hashes (abfd);
1514
1515 sreloc = NULL;
1516
1517 rel_end = relocs + sec->reloc_count;
1518 for (rel = relocs; rel < rel_end; rel++)
1519 {
1520 unsigned int r_type;
1521 unsigned long r_symndx;
1522 struct elf_link_hash_entry *h;
1523 struct elf_i386_link_hash_entry *eh;
1524 Elf_Internal_Sym *isym;
1525 const char *name;
1526 bfd_boolean size_reloc;
1527
1528 r_symndx = ELF32_R_SYM (rel->r_info);
1529 r_type = ELF32_R_TYPE (rel->r_info);
1530
1531 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1532 {
1533 (*_bfd_error_handler) (_("%B: bad symbol index: %d"),
1534 abfd,
1535 r_symndx);
1536 return FALSE;
1537 }
1538
1539 if (r_symndx < symtab_hdr->sh_info)
1540 {
1541 /* A local symbol. */
1542 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1543 abfd, r_symndx);
1544 if (isym == NULL)
1545 return FALSE;
1546
1547 /* Check relocation against local STT_GNU_IFUNC symbol. */
1548 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1549 {
1550 h = elf_i386_get_local_sym_hash (htab, abfd, rel, TRUE);
1551 if (h == NULL)
1552 return FALSE;
1553
1554 /* Fake a STT_GNU_IFUNC symbol. */
1555 h->type = STT_GNU_IFUNC;
1556 h->def_regular = 1;
1557 h->ref_regular = 1;
1558 h->forced_local = 1;
1559 h->root.type = bfd_link_hash_defined;
1560 }
1561 else
1562 h = NULL;
1563 }
1564 else
1565 {
1566 isym = NULL;
1567 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1568 while (h->root.type == bfd_link_hash_indirect
1569 || h->root.type == bfd_link_hash_warning)
1570 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1571 }
1572
1573 eh = (struct elf_i386_link_hash_entry *) h;
1574 if (h != NULL)
1575 {
1576 /* Create the ifunc sections for static executables. If we
1577 never see an indirect function symbol nor we are building
1578 a static executable, those sections will be empty and
1579 won't appear in output. */
1580 switch (r_type)
1581 {
1582 default:
1583 break;
1584
1585 case R_386_GOTOFF:
1586 eh->gotoff_ref = 1;
1587 case R_386_32:
1588 case R_386_PC32:
1589 case R_386_PLT32:
1590 case R_386_GOT32:
1591 case R_386_GOT32X:
1592 if (htab->elf.dynobj == NULL)
1593 htab->elf.dynobj = abfd;
1594 if (!_bfd_elf_create_ifunc_sections (htab->elf.dynobj, info))
1595 return FALSE;
1596 break;
1597 }
1598
1599 /* It is referenced by a non-shared object. */
1600 h->ref_regular = 1;
1601 h->root.non_ir_ref = 1;
1602
1603 if (h->type == STT_GNU_IFUNC)
1604 elf_tdata (info->output_bfd)->has_gnu_symbols
1605 |= elf_gnu_symbol_ifunc;
1606 }
1607
1608 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
1609 symtab_hdr, sym_hashes,
1610 &r_type, GOT_UNKNOWN,
1611 rel, rel_end, h, r_symndx))
1612 return FALSE;
1613
1614 switch (r_type)
1615 {
1616 case R_386_TLS_LDM:
1617 htab->tls_ldm_got.refcount += 1;
1618 goto create_got;
1619
1620 case R_386_PLT32:
1621 /* This symbol requires a procedure linkage table entry. We
1622 actually build the entry in adjust_dynamic_symbol,
1623 because this might be a case of linking PIC code which is
1624 never referenced by a dynamic object, in which case we
1625 don't need to generate a procedure linkage table entry
1626 after all. */
1627
1628 /* If this is a local symbol, we resolve it directly without
1629 creating a procedure linkage table entry. */
1630 if (h == NULL)
1631 continue;
1632
1633 h->needs_plt = 1;
1634 h->plt.refcount += 1;
1635 break;
1636
1637 case R_386_SIZE32:
1638 size_reloc = TRUE;
1639 goto do_size;
1640
1641 case R_386_TLS_IE_32:
1642 case R_386_TLS_IE:
1643 case R_386_TLS_GOTIE:
1644 if (!bfd_link_executable (info))
1645 info->flags |= DF_STATIC_TLS;
1646 /* Fall through */
1647
1648 case R_386_GOT32:
1649 case R_386_GOT32X:
1650 case R_386_TLS_GD:
1651 case R_386_TLS_GOTDESC:
1652 case R_386_TLS_DESC_CALL:
1653 /* This symbol requires a global offset table entry. */
1654 {
1655 int tls_type, old_tls_type;
1656
1657 switch (r_type)
1658 {
1659 default:
1660 case R_386_GOT32:
1661 case R_386_GOT32X:
1662 tls_type = GOT_NORMAL;
1663 break;
1664 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1665 case R_386_TLS_GOTDESC:
1666 case R_386_TLS_DESC_CALL:
1667 tls_type = GOT_TLS_GDESC; break;
1668 case R_386_TLS_IE_32:
1669 if (ELF32_R_TYPE (rel->r_info) == r_type)
1670 tls_type = GOT_TLS_IE_NEG;
1671 else
1672 /* If this is a GD->IE transition, we may use either of
1673 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1674 tls_type = GOT_TLS_IE;
1675 break;
1676 case R_386_TLS_IE:
1677 case R_386_TLS_GOTIE:
1678 tls_type = GOT_TLS_IE_POS; break;
1679 }
1680
1681 if (h != NULL)
1682 {
1683 h->got.refcount += 1;
1684 old_tls_type = elf_i386_hash_entry(h)->tls_type;
1685 }
1686 else
1687 {
1688 bfd_signed_vma *local_got_refcounts;
1689
1690 /* This is a global offset table entry for a local symbol. */
1691 local_got_refcounts = elf_local_got_refcounts (abfd);
1692 if (local_got_refcounts == NULL)
1693 {
1694 bfd_size_type size;
1695
1696 size = symtab_hdr->sh_info;
1697 size *= (sizeof (bfd_signed_vma)
1698 + sizeof (bfd_vma) + sizeof(char));
1699 local_got_refcounts = (bfd_signed_vma *)
1700 bfd_zalloc (abfd, size);
1701 if (local_got_refcounts == NULL)
1702 return FALSE;
1703 elf_local_got_refcounts (abfd) = local_got_refcounts;
1704 elf_i386_local_tlsdesc_gotent (abfd)
1705 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1706 elf_i386_local_got_tls_type (abfd)
1707 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1708 }
1709 local_got_refcounts[r_symndx] += 1;
1710 old_tls_type = elf_i386_local_got_tls_type (abfd) [r_symndx];
1711 }
1712
1713 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1714 tls_type |= old_tls_type;
1715 /* If a TLS symbol is accessed using IE at least once,
1716 there is no point to use dynamic model for it. */
1717 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1718 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1719 || (tls_type & GOT_TLS_IE) == 0))
1720 {
1721 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1722 tls_type = old_tls_type;
1723 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1724 && GOT_TLS_GD_ANY_P (tls_type))
1725 tls_type |= old_tls_type;
1726 else
1727 {
1728 if (h)
1729 name = h->root.root.string;
1730 else
1731 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1732 NULL);
1733 (*_bfd_error_handler)
1734 (_("%B: `%s' accessed both as normal and "
1735 "thread local symbol"),
1736 abfd, name);
1737 bfd_set_error (bfd_error_bad_value);
1738 return FALSE;
1739 }
1740 }
1741
1742 if (old_tls_type != tls_type)
1743 {
1744 if (h != NULL)
1745 elf_i386_hash_entry (h)->tls_type = tls_type;
1746 else
1747 elf_i386_local_got_tls_type (abfd) [r_symndx] = tls_type;
1748 }
1749 }
1750 /* Fall through */
1751
1752 case R_386_GOTOFF:
1753 case R_386_GOTPC:
1754 create_got:
1755 if (htab->elf.sgot == NULL)
1756 {
1757 if (htab->elf.dynobj == NULL)
1758 htab->elf.dynobj = abfd;
1759 if (!_bfd_elf_create_got_section (htab->elf.dynobj, info))
1760 return FALSE;
1761 }
1762 if (r_type != R_386_TLS_IE)
1763 break;
1764 /* Fall through */
1765
1766 case R_386_TLS_LE_32:
1767 case R_386_TLS_LE:
1768 if (bfd_link_executable (info))
1769 break;
1770 info->flags |= DF_STATIC_TLS;
1771 /* Fall through */
1772
1773 case R_386_32:
1774 case R_386_PC32:
1775 if (h != NULL && bfd_link_executable (info))
1776 {
1777 /* If this reloc is in a read-only section, we might
1778 need a copy reloc. We can't check reliably at this
1779 stage whether the section is read-only, as input
1780 sections have not yet been mapped to output sections.
1781 Tentatively set the flag for now, and correct in
1782 adjust_dynamic_symbol. */
1783 h->non_got_ref = 1;
1784
1785 /* We may need a .plt entry if the function this reloc
1786 refers to is in a shared lib. */
1787 h->plt.refcount += 1;
1788 if (r_type == R_386_PC32)
1789 {
1790 /* Since something like ".long foo - ." may be used
1791 as pointer, make sure that PLT is used if foo is
1792 a function defined in a shared library. */
1793 if ((sec->flags & SEC_CODE) == 0)
1794 h->pointer_equality_needed = 1;
1795 }
1796 else
1797 {
1798 h->pointer_equality_needed = 1;
1799 /* R_386_32 can be resolved at run-time. */
1800 if (r_type == R_386_32
1801 && (sec->flags & SEC_READONLY) == 0)
1802 eh->func_pointer_refcount += 1;
1803 }
1804 }
1805
1806 size_reloc = FALSE;
1807 do_size:
1808 /* If we are creating a shared library, and this is a reloc
1809 against a global symbol, or a non PC relative reloc
1810 against a local symbol, then we need to copy the reloc
1811 into the shared library. However, if we are linking with
1812 -Bsymbolic, we do not need to copy a reloc against a
1813 global symbol which is defined in an object we are
1814 including in the link (i.e., DEF_REGULAR is set). At
1815 this point we have not seen all the input files, so it is
1816 possible that DEF_REGULAR is not set now but will be set
1817 later (it is never cleared). In case of a weak definition,
1818 DEF_REGULAR may be cleared later by a strong definition in
1819 a shared library. We account for that possibility below by
1820 storing information in the relocs_copied field of the hash
1821 table entry. A similar situation occurs when creating
1822 shared libraries and symbol visibility changes render the
1823 symbol local.
1824
1825 If on the other hand, we are creating an executable, we
1826 may need to keep relocations for symbols satisfied by a
1827 dynamic library if we manage to avoid copy relocs for the
1828 symbol. */
1829 if ((bfd_link_pic (info)
1830 && (sec->flags & SEC_ALLOC) != 0
1831 && (r_type != R_386_PC32
1832 || (h != NULL
1833 && (! SYMBOLIC_BIND (info, h)
1834 || h->root.type == bfd_link_hash_defweak
1835 || !h->def_regular))))
1836 || (ELIMINATE_COPY_RELOCS
1837 && !bfd_link_pic (info)
1838 && (sec->flags & SEC_ALLOC) != 0
1839 && h != NULL
1840 && (h->root.type == bfd_link_hash_defweak
1841 || !h->def_regular)))
1842 {
1843 struct elf_dyn_relocs *p;
1844 struct elf_dyn_relocs **head;
1845
1846 /* We must copy these reloc types into the output file.
1847 Create a reloc section in dynobj and make room for
1848 this reloc. */
1849 if (sreloc == NULL)
1850 {
1851 if (htab->elf.dynobj == NULL)
1852 htab->elf.dynobj = abfd;
1853
1854 sreloc = _bfd_elf_make_dynamic_reloc_section
1855 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1856
1857 if (sreloc == NULL)
1858 return FALSE;
1859 }
1860
1861 /* If this is a global symbol, we count the number of
1862 relocations we need for this symbol. */
1863 if (h != NULL)
1864 {
1865 head = &eh->dyn_relocs;
1866 }
1867 else
1868 {
1869 /* Track dynamic relocs needed for local syms too.
1870 We really need local syms available to do this
1871 easily. Oh well. */
1872 void **vpp;
1873 asection *s;
1874
1875 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1876 abfd, r_symndx);
1877 if (isym == NULL)
1878 return FALSE;
1879
1880 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1881 if (s == NULL)
1882 s = sec;
1883
1884 vpp = &elf_section_data (s)->local_dynrel;
1885 head = (struct elf_dyn_relocs **)vpp;
1886 }
1887
1888 p = *head;
1889 if (p == NULL || p->sec != sec)
1890 {
1891 bfd_size_type amt = sizeof *p;
1892 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1893 amt);
1894 if (p == NULL)
1895 return FALSE;
1896 p->next = *head;
1897 *head = p;
1898 p->sec = sec;
1899 p->count = 0;
1900 p->pc_count = 0;
1901 }
1902
1903 p->count += 1;
1904 /* Count size relocation as PC-relative relocation. */
1905 if (r_type == R_386_PC32 || size_reloc)
1906 p->pc_count += 1;
1907 }
1908 break;
1909
1910 /* This relocation describes the C++ object vtable hierarchy.
1911 Reconstruct it for later use during GC. */
1912 case R_386_GNU_VTINHERIT:
1913 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1914 return FALSE;
1915 break;
1916
1917 /* This relocation describes which C++ vtable entries are actually
1918 used. Record for later use during GC. */
1919 case R_386_GNU_VTENTRY:
1920 BFD_ASSERT (h != NULL);
1921 if (h != NULL
1922 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1923 return FALSE;
1924 break;
1925
1926 default:
1927 break;
1928 }
1929
1930 if (use_plt_got
1931 && h != NULL
1932 && h->plt.refcount > 0
1933 && (((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
1934 || h->got.refcount > 0)
1935 && htab->plt_got == NULL)
1936 {
1937 /* Create the GOT procedure linkage table. */
1938 unsigned int plt_got_align;
1939 const struct elf_backend_data *bed;
1940
1941 bed = get_elf_backend_data (info->output_bfd);
1942 BFD_ASSERT (sizeof (elf_i386_got_plt_entry) == 8
1943 && (sizeof (elf_i386_got_plt_entry)
1944 == sizeof (elf_i386_pic_got_plt_entry)));
1945 plt_got_align = 3;
1946
1947 if (htab->elf.dynobj == NULL)
1948 htab->elf.dynobj = abfd;
1949 htab->plt_got
1950 = bfd_make_section_anyway_with_flags (htab->elf.dynobj,
1951 ".plt.got",
1952 (bed->dynamic_sec_flags
1953 | SEC_ALLOC
1954 | SEC_CODE
1955 | SEC_LOAD
1956 | SEC_READONLY));
1957 if (htab->plt_got == NULL
1958 || !bfd_set_section_alignment (htab->elf.dynobj,
1959 htab->plt_got,
1960 plt_got_align))
1961 return FALSE;
1962 }
1963
1964 if ((r_type == R_386_GOT32 || r_type == R_386_GOT32X)
1965 && (h == NULL || h->type != STT_GNU_IFUNC))
1966 sec->need_convert_load = 1;
1967 }
1968
1969 return TRUE;
1970 }
1971
1972 /* Return the section that should be marked against GC for a given
1973 relocation. */
1974
1975 static asection *
1976 elf_i386_gc_mark_hook (asection *sec,
1977 struct bfd_link_info *info,
1978 Elf_Internal_Rela *rel,
1979 struct elf_link_hash_entry *h,
1980 Elf_Internal_Sym *sym)
1981 {
1982 if (h != NULL)
1983 switch (ELF32_R_TYPE (rel->r_info))
1984 {
1985 case R_386_GNU_VTINHERIT:
1986 case R_386_GNU_VTENTRY:
1987 return NULL;
1988 }
1989
1990 return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
1991 }
1992
1993 /* Update the got entry reference counts for the section being removed. */
1994
1995 static bfd_boolean
1996 elf_i386_gc_sweep_hook (bfd *abfd,
1997 struct bfd_link_info *info,
1998 asection *sec,
1999 const Elf_Internal_Rela *relocs)
2000 {
2001 struct elf_i386_link_hash_table *htab;
2002 Elf_Internal_Shdr *symtab_hdr;
2003 struct elf_link_hash_entry **sym_hashes;
2004 bfd_signed_vma *local_got_refcounts;
2005 const Elf_Internal_Rela *rel, *relend;
2006
2007 if (bfd_link_relocatable (info))
2008 return TRUE;
2009
2010 htab = elf_i386_hash_table (info);
2011 if (htab == NULL)
2012 return FALSE;
2013
2014 elf_section_data (sec)->local_dynrel = NULL;
2015
2016 symtab_hdr = &elf_symtab_hdr (abfd);
2017 sym_hashes = elf_sym_hashes (abfd);
2018 local_got_refcounts = elf_local_got_refcounts (abfd);
2019
2020 relend = relocs + sec->reloc_count;
2021 for (rel = relocs; rel < relend; rel++)
2022 {
2023 unsigned long r_symndx;
2024 unsigned int r_type;
2025 struct elf_link_hash_entry *h = NULL;
2026
2027 r_symndx = ELF32_R_SYM (rel->r_info);
2028 if (r_symndx >= symtab_hdr->sh_info)
2029 {
2030 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
2031 while (h->root.type == bfd_link_hash_indirect
2032 || h->root.type == bfd_link_hash_warning)
2033 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2034 }
2035 else
2036 {
2037 /* A local symbol. */
2038 Elf_Internal_Sym *isym;
2039
2040 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2041 abfd, r_symndx);
2042
2043 /* Check relocation against local STT_GNU_IFUNC symbol. */
2044 if (isym != NULL
2045 && ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2046 {
2047 h = elf_i386_get_local_sym_hash (htab, abfd, rel, FALSE);
2048 if (h == NULL)
2049 abort ();
2050 }
2051 }
2052
2053 if (h)
2054 {
2055 struct elf_i386_link_hash_entry *eh;
2056 struct elf_dyn_relocs **pp;
2057 struct elf_dyn_relocs *p;
2058
2059 eh = (struct elf_i386_link_hash_entry *) h;
2060 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; pp = &p->next)
2061 if (p->sec == sec)
2062 {
2063 /* Everything must go for SEC. */
2064 *pp = p->next;
2065 break;
2066 }
2067 }
2068
2069 r_type = ELF32_R_TYPE (rel->r_info);
2070 if (! elf_i386_tls_transition (info, abfd, sec, NULL,
2071 symtab_hdr, sym_hashes,
2072 &r_type, GOT_UNKNOWN,
2073 rel, relend, h, r_symndx))
2074 return FALSE;
2075
2076 switch (r_type)
2077 {
2078 case R_386_TLS_LDM:
2079 if (htab->tls_ldm_got.refcount > 0)
2080 htab->tls_ldm_got.refcount -= 1;
2081 break;
2082
2083 case R_386_TLS_GD:
2084 case R_386_TLS_GOTDESC:
2085 case R_386_TLS_DESC_CALL:
2086 case R_386_TLS_IE_32:
2087 case R_386_TLS_IE:
2088 case R_386_TLS_GOTIE:
2089 case R_386_GOT32:
2090 case R_386_GOT32X:
2091 if (h != NULL)
2092 {
2093 if (h->got.refcount > 0)
2094 h->got.refcount -= 1;
2095 if (h->type == STT_GNU_IFUNC)
2096 {
2097 if (h->plt.refcount > 0)
2098 h->plt.refcount -= 1;
2099 }
2100 }
2101 else if (local_got_refcounts != NULL)
2102 {
2103 if (local_got_refcounts[r_symndx] > 0)
2104 local_got_refcounts[r_symndx] -= 1;
2105 }
2106 break;
2107
2108 case R_386_32:
2109 case R_386_PC32:
2110 case R_386_SIZE32:
2111 if (bfd_link_pic (info)
2112 && (h == NULL || h->type != STT_GNU_IFUNC))
2113 break;
2114 /* Fall through */
2115
2116 case R_386_PLT32:
2117 if (h != NULL)
2118 {
2119 if (h->plt.refcount > 0)
2120 h->plt.refcount -= 1;
2121 if (r_type == R_386_32
2122 && (sec->flags & SEC_READONLY) == 0)
2123 {
2124 struct elf_i386_link_hash_entry *eh
2125 = (struct elf_i386_link_hash_entry *) h;
2126 if (eh->func_pointer_refcount > 0)
2127 eh->func_pointer_refcount -= 1;
2128 }
2129 }
2130 break;
2131
2132 case R_386_GOTOFF:
2133 if (h != NULL && h->type == STT_GNU_IFUNC)
2134 {
2135 if (h->got.refcount > 0)
2136 h->got.refcount -= 1;
2137 if (h->plt.refcount > 0)
2138 h->plt.refcount -= 1;
2139 }
2140 break;
2141
2142 default:
2143 break;
2144 }
2145 }
2146
2147 return TRUE;
2148 }
2149
2150 /* Adjust a symbol defined by a dynamic object and referenced by a
2151 regular object. The current definition is in some section of the
2152 dynamic object, but we're not including those sections. We have to
2153 change the definition to something the rest of the link can
2154 understand. */
2155
2156 static bfd_boolean
2157 elf_i386_adjust_dynamic_symbol (struct bfd_link_info *info,
2158 struct elf_link_hash_entry *h)
2159 {
2160 struct elf_i386_link_hash_table *htab;
2161 asection *s;
2162 struct elf_i386_link_hash_entry *eh;
2163 struct elf_dyn_relocs *p;
2164
2165 /* STT_GNU_IFUNC symbol must go through PLT. */
2166 if (h->type == STT_GNU_IFUNC)
2167 {
2168 /* All local STT_GNU_IFUNC references must be treate as local
2169 calls via local PLT. */
2170 if (h->ref_regular
2171 && SYMBOL_CALLS_LOCAL (info, h))
2172 {
2173 bfd_size_type pc_count = 0, count = 0;
2174 struct elf_dyn_relocs **pp;
2175
2176 eh = (struct elf_i386_link_hash_entry *) h;
2177 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2178 {
2179 pc_count += p->pc_count;
2180 p->count -= p->pc_count;
2181 p->pc_count = 0;
2182 count += p->count;
2183 if (p->count == 0)
2184 *pp = p->next;
2185 else
2186 pp = &p->next;
2187 }
2188
2189 if (pc_count || count)
2190 {
2191 h->needs_plt = 1;
2192 h->non_got_ref = 1;
2193 if (h->plt.refcount <= 0)
2194 h->plt.refcount = 1;
2195 else
2196 h->plt.refcount += 1;
2197 }
2198 }
2199
2200 if (h->plt.refcount <= 0)
2201 {
2202 h->plt.offset = (bfd_vma) -1;
2203 h->needs_plt = 0;
2204 }
2205 return TRUE;
2206 }
2207
2208 /* If this is a function, put it in the procedure linkage table. We
2209 will fill in the contents of the procedure linkage table later,
2210 when we know the address of the .got section. */
2211 if (h->type == STT_FUNC
2212 || h->needs_plt)
2213 {
2214 if (h->plt.refcount <= 0
2215 || SYMBOL_CALLS_LOCAL (info, h)
2216 || (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT
2217 && h->root.type == bfd_link_hash_undefweak))
2218 {
2219 /* This case can occur if we saw a PLT32 reloc in an input
2220 file, but the symbol was never referred to by a dynamic
2221 object, or if all references were garbage collected. In
2222 such a case, we don't actually need to build a procedure
2223 linkage table, and we can just do a PC32 reloc instead. */
2224 h->plt.offset = (bfd_vma) -1;
2225 h->needs_plt = 0;
2226 }
2227
2228 return TRUE;
2229 }
2230 else
2231 /* It's possible that we incorrectly decided a .plt reloc was
2232 needed for an R_386_PC32 reloc to a non-function sym in
2233 check_relocs. We can't decide accurately between function and
2234 non-function syms in check-relocs; Objects loaded later in
2235 the link may change h->type. So fix it now. */
2236 h->plt.offset = (bfd_vma) -1;
2237
2238 /* If this is a weak symbol, and there is a real definition, the
2239 processor independent code will have arranged for us to see the
2240 real definition first, and we can just use the same value. */
2241 if (h->u.weakdef != NULL)
2242 {
2243 BFD_ASSERT (h->u.weakdef->root.type == bfd_link_hash_defined
2244 || h->u.weakdef->root.type == bfd_link_hash_defweak);
2245 h->root.u.def.section = h->u.weakdef->root.u.def.section;
2246 h->root.u.def.value = h->u.weakdef->root.u.def.value;
2247 if (ELIMINATE_COPY_RELOCS || info->nocopyreloc)
2248 h->non_got_ref = h->u.weakdef->non_got_ref;
2249 return TRUE;
2250 }
2251
2252 /* This is a reference to a symbol defined by a dynamic object which
2253 is not a function. */
2254
2255 /* If we are creating a shared library, we must presume that the
2256 only references to the symbol are via the global offset table.
2257 For such cases we need not do anything here; the relocations will
2258 be handled correctly by relocate_section. */
2259 if (!bfd_link_executable (info))
2260 return TRUE;
2261
2262 /* If there are no references to this symbol that do not use the
2263 GOT nor R_386_GOTOFF relocation, we don't need to generate a copy
2264 reloc. */
2265 eh = (struct elf_i386_link_hash_entry *) h;
2266 if (!h->non_got_ref && !eh->gotoff_ref)
2267 return TRUE;
2268
2269 /* If -z nocopyreloc was given, we won't generate them either. */
2270 if (info->nocopyreloc)
2271 {
2272 h->non_got_ref = 0;
2273 return TRUE;
2274 }
2275
2276 htab = elf_i386_hash_table (info);
2277 if (htab == NULL)
2278 return FALSE;
2279
2280 /* If there aren't any dynamic relocs in read-only sections nor
2281 R_386_GOTOFF relocation, then we can keep the dynamic relocs and
2282 avoid the copy reloc. This doesn't work on VxWorks, where we can
2283 not have dynamic relocations (other than copy and jump slot
2284 relocations) in an executable. */
2285 if (ELIMINATE_COPY_RELOCS
2286 && !eh->gotoff_ref
2287 && !get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2288 {
2289 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2290 {
2291 s = p->sec->output_section;
2292 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2293 break;
2294 }
2295
2296 if (p == NULL)
2297 {
2298 h->non_got_ref = 0;
2299 return TRUE;
2300 }
2301 }
2302
2303 /* We must allocate the symbol in our .dynbss section, which will
2304 become part of the .bss section of the executable. There will be
2305 an entry for this symbol in the .dynsym section. The dynamic
2306 object will contain position independent code, so all references
2307 from the dynamic object to this symbol will go through the global
2308 offset table. The dynamic linker will use the .dynsym entry to
2309 determine the address it must put in the global offset table, so
2310 both the dynamic object and the regular object will refer to the
2311 same memory location for the variable. */
2312
2313 /* We must generate a R_386_COPY reloc to tell the dynamic linker to
2314 copy the initial value out of the dynamic object and into the
2315 runtime process image. */
2316 if ((h->root.u.def.section->flags & SEC_ALLOC) != 0 && h->size != 0)
2317 {
2318 htab->srelbss->size += sizeof (Elf32_External_Rel);
2319 h->needs_copy = 1;
2320 }
2321
2322 s = htab->sdynbss;
2323
2324 return _bfd_elf_adjust_dynamic_copy (info, h, s);
2325 }
2326
2327 /* Allocate space in .plt, .got and associated reloc sections for
2328 dynamic relocs. */
2329
2330 static bfd_boolean
2331 elf_i386_allocate_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2332 {
2333 struct bfd_link_info *info;
2334 struct elf_i386_link_hash_table *htab;
2335 struct elf_i386_link_hash_entry *eh;
2336 struct elf_dyn_relocs *p;
2337 unsigned plt_entry_size;
2338
2339 if (h->root.type == bfd_link_hash_indirect)
2340 return TRUE;
2341
2342 eh = (struct elf_i386_link_hash_entry *) h;
2343
2344 info = (struct bfd_link_info *) inf;
2345 htab = elf_i386_hash_table (info);
2346 if (htab == NULL)
2347 return FALSE;
2348
2349 plt_entry_size = GET_PLT_ENTRY_SIZE (info->output_bfd);
2350
2351 /* Clear the reference count of function pointer relocations if
2352 symbol isn't a normal function. */
2353 if (h->type != STT_FUNC)
2354 eh->func_pointer_refcount = 0;
2355
2356 /* We can't use the GOT PLT if pointer equality is needed since
2357 finish_dynamic_symbol won't clear symbol value and the dynamic
2358 linker won't update the GOT slot. We will get into an infinite
2359 loop at run-time. */
2360 if (htab->plt_got != NULL
2361 && h->type != STT_GNU_IFUNC
2362 && !h->pointer_equality_needed
2363 && h->plt.refcount > 0
2364 && h->got.refcount > 0)
2365 {
2366 /* Don't use the regular PLT if there are both GOT and GOTPLT
2367 reloctions. */
2368 h->plt.offset = (bfd_vma) -1;
2369
2370 /* Use the GOT PLT. */
2371 eh->plt_got.refcount = 1;
2372 }
2373
2374 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle it
2375 here if it is defined and referenced in a non-shared object. */
2376 if (h->type == STT_GNU_IFUNC
2377 && h->def_regular)
2378 return _bfd_elf_allocate_ifunc_dyn_relocs (info, h, &eh->dyn_relocs,
2379 plt_entry_size,
2380 plt_entry_size, 4);
2381 /* Don't create the PLT entry if there are only function pointer
2382 relocations which can be resolved at run-time. */
2383 else if (htab->elf.dynamic_sections_created
2384 && (h->plt.refcount > eh->func_pointer_refcount
2385 || eh->plt_got.refcount > 0))
2386 {
2387 bfd_boolean use_plt_got;
2388
2389 /* Clear the reference count of function pointer relocations
2390 if PLT is used. */
2391 eh->func_pointer_refcount = 0;
2392
2393 if ((info->flags & DF_BIND_NOW) && !h->pointer_equality_needed)
2394 {
2395 /* Don't use the regular PLT for DF_BIND_NOW. */
2396 h->plt.offset = (bfd_vma) -1;
2397
2398 /* Use the GOT PLT. */
2399 h->got.refcount = 1;
2400 eh->plt_got.refcount = 1;
2401 }
2402
2403 use_plt_got = eh->plt_got.refcount > 0;
2404
2405 /* Make sure this symbol is output as a dynamic symbol.
2406 Undefined weak syms won't yet be marked as dynamic. */
2407 if (h->dynindx == -1
2408 && !h->forced_local)
2409 {
2410 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2411 return FALSE;
2412 }
2413
2414 if (bfd_link_pic (info)
2415 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (1, 0, h))
2416 {
2417 asection *s = htab->elf.splt;
2418 asection *got_s = htab->plt_got;
2419
2420 /* If this is the first .plt entry, make room for the special
2421 first entry. The .plt section is used by prelink to undo
2422 prelinking for dynamic relocations. */
2423 if (s->size == 0)
2424 s->size = plt_entry_size;
2425
2426 if (use_plt_got)
2427 eh->plt_got.offset = got_s->size;
2428 else
2429 h->plt.offset = s->size;
2430
2431 /* If this symbol is not defined in a regular file, and we are
2432 not generating a shared library, then set the symbol to this
2433 location in the .plt. This is required to make function
2434 pointers compare as equal between the normal executable and
2435 the shared library. */
2436 if (! bfd_link_pic (info)
2437 && !h->def_regular)
2438 {
2439 if (use_plt_got)
2440 {
2441 /* We need to make a call to the entry of the GOT PLT
2442 instead of regular PLT entry. */
2443 h->root.u.def.section = got_s;
2444 h->root.u.def.value = eh->plt_got.offset;
2445 }
2446 else
2447 {
2448 h->root.u.def.section = s;
2449 h->root.u.def.value = h->plt.offset;
2450 }
2451 }
2452
2453 /* Make room for this entry. */
2454 if (use_plt_got)
2455 got_s->size += sizeof (elf_i386_got_plt_entry);
2456 else
2457 {
2458 s->size += plt_entry_size;
2459
2460 /* We also need to make an entry in the .got.plt section,
2461 which will be placed in the .got section by the linker
2462 script. */
2463 htab->elf.sgotplt->size += 4;
2464
2465 /* We also need to make an entry in the .rel.plt section. */
2466 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2467 htab->elf.srelplt->reloc_count++;
2468 }
2469
2470 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks
2471 && !bfd_link_pic (info))
2472 {
2473 /* VxWorks has a second set of relocations for each PLT entry
2474 in executables. They go in a separate relocation section,
2475 which is processed by the kernel loader. */
2476
2477 /* There are two relocations for the initial PLT entry: an
2478 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 4 and an
2479 R_386_32 relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
2480
2481 if (h->plt.offset == plt_entry_size)
2482 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2483
2484 /* There are two extra relocations for each subsequent PLT entry:
2485 an R_386_32 relocation for the GOT entry, and an R_386_32
2486 relocation for the PLT entry. */
2487
2488 htab->srelplt2->size += (sizeof (Elf32_External_Rel) * 2);
2489 }
2490 }
2491 else
2492 {
2493 h->plt.offset = (bfd_vma) -1;
2494 h->needs_plt = 0;
2495 }
2496 }
2497 else
2498 {
2499 h->plt.offset = (bfd_vma) -1;
2500 h->needs_plt = 0;
2501 }
2502
2503 eh->tlsdesc_got = (bfd_vma) -1;
2504
2505 /* If R_386_TLS_{IE_32,IE,GOTIE} symbol is now local to the binary,
2506 make it a R_386_TLS_LE_32 requiring no TLS entry. */
2507 if (h->got.refcount > 0
2508 && bfd_link_executable (info)
2509 && h->dynindx == -1
2510 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE))
2511 h->got.offset = (bfd_vma) -1;
2512 else if (h->got.refcount > 0)
2513 {
2514 asection *s;
2515 bfd_boolean dyn;
2516 int tls_type = elf_i386_hash_entry(h)->tls_type;
2517
2518 /* Make sure this symbol is output as a dynamic symbol.
2519 Undefined weak syms won't yet be marked as dynamic. */
2520 if (h->dynindx == -1
2521 && !h->forced_local)
2522 {
2523 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2524 return FALSE;
2525 }
2526
2527 s = htab->elf.sgot;
2528 if (GOT_TLS_GDESC_P (tls_type))
2529 {
2530 eh->tlsdesc_got = htab->elf.sgotplt->size
2531 - elf_i386_compute_jump_table_size (htab);
2532 htab->elf.sgotplt->size += 8;
2533 h->got.offset = (bfd_vma) -2;
2534 }
2535 if (! GOT_TLS_GDESC_P (tls_type)
2536 || GOT_TLS_GD_P (tls_type))
2537 {
2538 h->got.offset = s->size;
2539 s->size += 4;
2540 /* R_386_TLS_GD needs 2 consecutive GOT slots. */
2541 if (GOT_TLS_GD_P (tls_type) || tls_type == GOT_TLS_IE_BOTH)
2542 s->size += 4;
2543 }
2544 dyn = htab->elf.dynamic_sections_created;
2545 /* R_386_TLS_IE_32 needs one dynamic relocation,
2546 R_386_TLS_IE resp. R_386_TLS_GOTIE needs one dynamic relocation,
2547 (but if both R_386_TLS_IE_32 and R_386_TLS_IE is present, we
2548 need two), R_386_TLS_GD needs one if local symbol and two if
2549 global. */
2550 if (tls_type == GOT_TLS_IE_BOTH)
2551 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2552 else if ((GOT_TLS_GD_P (tls_type) && h->dynindx == -1)
2553 || (tls_type & GOT_TLS_IE))
2554 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2555 else if (GOT_TLS_GD_P (tls_type))
2556 htab->elf.srelgot->size += 2 * sizeof (Elf32_External_Rel);
2557 else if (! GOT_TLS_GDESC_P (tls_type)
2558 && (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2559 || h->root.type != bfd_link_hash_undefweak)
2560 && (bfd_link_pic (info)
2561 || WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn, 0, h)))
2562 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
2563 if (GOT_TLS_GDESC_P (tls_type))
2564 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
2565 }
2566 else
2567 h->got.offset = (bfd_vma) -1;
2568
2569 if (eh->dyn_relocs == NULL)
2570 return TRUE;
2571
2572 /* In the shared -Bsymbolic case, discard space allocated for
2573 dynamic pc-relative relocs against symbols which turn out to be
2574 defined in regular objects. For the normal shared case, discard
2575 space for pc-relative relocs that have become local due to symbol
2576 visibility changes. */
2577
2578 if (bfd_link_pic (info))
2579 {
2580 /* The only reloc that uses pc_count is R_386_PC32, which will
2581 appear on a call or on something like ".long foo - .". We
2582 want calls to protected symbols to resolve directly to the
2583 function rather than going via the plt. If people want
2584 function pointer comparisons to work as expected then they
2585 should avoid writing assembly like ".long foo - .". */
2586 if (SYMBOL_CALLS_LOCAL (info, h))
2587 {
2588 struct elf_dyn_relocs **pp;
2589
2590 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2591 {
2592 p->count -= p->pc_count;
2593 p->pc_count = 0;
2594 if (p->count == 0)
2595 *pp = p->next;
2596 else
2597 pp = &p->next;
2598 }
2599 }
2600
2601 if (get_elf_i386_backend_data (info->output_bfd)->is_vxworks)
2602 {
2603 struct elf_dyn_relocs **pp;
2604 for (pp = &eh->dyn_relocs; (p = *pp) != NULL; )
2605 {
2606 if (strcmp (p->sec->output_section->name, ".tls_vars") == 0)
2607 *pp = p->next;
2608 else
2609 pp = &p->next;
2610 }
2611 }
2612
2613 /* Also discard relocs on undefined weak syms with non-default
2614 visibility. */
2615 if (eh->dyn_relocs != NULL
2616 && h->root.type == bfd_link_hash_undefweak)
2617 {
2618 if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
2619 eh->dyn_relocs = NULL;
2620
2621 /* Make sure undefined weak symbols are output as a dynamic
2622 symbol in PIEs. */
2623 else if (h->dynindx == -1
2624 && !h->forced_local)
2625 {
2626 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2627 return FALSE;
2628 }
2629 }
2630 }
2631 else if (ELIMINATE_COPY_RELOCS)
2632 {
2633 /* For the non-shared case, discard space for relocs against
2634 symbols which turn out to need copy relocs or are not
2635 dynamic. Keep dynamic relocations for run-time function
2636 pointer initialization. */
2637
2638 if ((!h->non_got_ref || eh->func_pointer_refcount > 0)
2639 && ((h->def_dynamic
2640 && !h->def_regular)
2641 || (htab->elf.dynamic_sections_created
2642 && (h->root.type == bfd_link_hash_undefweak
2643 || h->root.type == bfd_link_hash_undefined))))
2644 {
2645 /* Make sure this symbol is output as a dynamic symbol.
2646 Undefined weak syms won't yet be marked as dynamic. */
2647 if (h->dynindx == -1
2648 && !h->forced_local)
2649 {
2650 if (! bfd_elf_link_record_dynamic_symbol (info, h))
2651 return FALSE;
2652 }
2653
2654 /* If that succeeded, we know we'll be keeping all the
2655 relocs. */
2656 if (h->dynindx != -1)
2657 goto keep;
2658 }
2659
2660 eh->dyn_relocs = NULL;
2661 eh->func_pointer_refcount = 0;
2662
2663 keep: ;
2664 }
2665
2666 /* Finally, allocate space. */
2667 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2668 {
2669 asection *sreloc;
2670
2671 sreloc = elf_section_data (p->sec)->sreloc;
2672
2673 BFD_ASSERT (sreloc != NULL);
2674 sreloc->size += p->count * sizeof (Elf32_External_Rel);
2675 }
2676
2677 return TRUE;
2678 }
2679
2680 /* Allocate space in .plt, .got and associated reloc sections for
2681 local dynamic relocs. */
2682
2683 static bfd_boolean
2684 elf_i386_allocate_local_dynrelocs (void **slot, void *inf)
2685 {
2686 struct elf_link_hash_entry *h
2687 = (struct elf_link_hash_entry *) *slot;
2688
2689 if (h->type != STT_GNU_IFUNC
2690 || !h->def_regular
2691 || !h->ref_regular
2692 || !h->forced_local
2693 || h->root.type != bfd_link_hash_defined)
2694 abort ();
2695
2696 return elf_i386_allocate_dynrelocs (h, inf);
2697 }
2698
2699 /* Find any dynamic relocs that apply to read-only sections. */
2700
2701 static bfd_boolean
2702 elf_i386_readonly_dynrelocs (struct elf_link_hash_entry *h, void *inf)
2703 {
2704 struct elf_i386_link_hash_entry *eh;
2705 struct elf_dyn_relocs *p;
2706
2707 /* Skip local IFUNC symbols. */
2708 if (h->forced_local && h->type == STT_GNU_IFUNC)
2709 return TRUE;
2710
2711 eh = (struct elf_i386_link_hash_entry *) h;
2712 for (p = eh->dyn_relocs; p != NULL; p = p->next)
2713 {
2714 asection *s = p->sec->output_section;
2715
2716 if (s != NULL && (s->flags & SEC_READONLY) != 0)
2717 {
2718 struct bfd_link_info *info = (struct bfd_link_info *) inf;
2719
2720 info->flags |= DF_TEXTREL;
2721
2722 if ((info->warn_shared_textrel && bfd_link_pic (info))
2723 || info->error_textrel)
2724 info->callbacks->einfo (_("%P: %B: warning: relocation against `%s' in readonly section `%A'\n"),
2725 p->sec->owner, h->root.root.string,
2726 p->sec);
2727
2728 /* Not an error, just cut short the traversal. */
2729 return FALSE;
2730 }
2731 }
2732 return TRUE;
2733 }
2734
2735 /* With the local symbol, foo, we convert
2736 mov foo@GOT[(%reg1)], %reg2
2737 to
2738 lea foo[@GOTOFF(%reg1)], %reg2
2739 and convert
2740 call/jmp *foo@GOT[(%reg)]
2741 to
2742 nop call foo/jmp foo nop
2743 When PIC is false, convert
2744 test %reg1, foo@GOT[(%reg2)]
2745 to
2746 test $foo, %reg1
2747 and convert
2748 binop foo@GOT[(%reg1)], %reg2
2749 to
2750 binop $foo, %reg2
2751 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
2752 instructions. */
2753
2754 static bfd_boolean
2755 elf_i386_convert_load (bfd *abfd, asection *sec,
2756 struct bfd_link_info *link_info)
2757 {
2758 Elf_Internal_Shdr *symtab_hdr;
2759 Elf_Internal_Rela *internal_relocs;
2760 Elf_Internal_Rela *irel, *irelend;
2761 bfd_byte *contents;
2762 struct elf_i386_link_hash_table *htab;
2763 bfd_boolean changed_contents;
2764 bfd_boolean changed_relocs;
2765 bfd_signed_vma *local_got_refcounts;
2766
2767 /* Don't even try to convert non-ELF outputs. */
2768 if (!is_elf_hash_table (link_info->hash))
2769 return FALSE;
2770
2771 /* Nothing to do if there is no need or no output. */
2772 if ((sec->flags & (SEC_CODE | SEC_RELOC)) != (SEC_CODE | SEC_RELOC)
2773 || sec->need_convert_load == 0
2774 || bfd_is_abs_section (sec->output_section))
2775 return TRUE;
2776
2777 symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
2778
2779 /* Load the relocations for this section. */
2780 internal_relocs = (_bfd_elf_link_read_relocs
2781 (abfd, sec, NULL, (Elf_Internal_Rela *) NULL,
2782 link_info->keep_memory));
2783 if (internal_relocs == NULL)
2784 return FALSE;
2785
2786 htab = elf_i386_hash_table (link_info);
2787 changed_contents = FALSE;
2788 changed_relocs = FALSE;
2789 local_got_refcounts = elf_local_got_refcounts (abfd);
2790
2791 /* Get the section contents. */
2792 if (elf_section_data (sec)->this_hdr.contents != NULL)
2793 contents = elf_section_data (sec)->this_hdr.contents;
2794 else
2795 {
2796 if (!bfd_malloc_and_get_section (abfd, sec, &contents))
2797 goto error_return;
2798 }
2799
2800 irelend = internal_relocs + sec->reloc_count;
2801 for (irel = internal_relocs; irel < irelend; irel++)
2802 {
2803 unsigned int r_type = ELF32_R_TYPE (irel->r_info);
2804 unsigned int r_symndx = ELF32_R_SYM (irel->r_info);
2805 unsigned int indx;
2806 struct elf_link_hash_entry *h;
2807 unsigned int opcode;
2808 unsigned int modrm;
2809 bfd_vma roff;
2810 bfd_boolean baseless;
2811 Elf_Internal_Sym *isym;
2812 unsigned int addend;
2813 unsigned int nop;
2814 bfd_vma nop_offset;
2815
2816 if (r_type != R_386_GOT32 && r_type != R_386_GOT32X)
2817 continue;
2818
2819 roff = irel->r_offset;
2820 if (roff < 2)
2821 continue;
2822
2823 modrm = bfd_get_8 (abfd, contents + roff - 1);
2824 baseless = (modrm & 0xc7) == 0x5;
2825
2826 if (r_type == R_386_GOT32X
2827 && baseless
2828 && bfd_link_pic (link_info))
2829 {
2830 /* For PIC, disallow R_386_GOT32X without a base register
2831 since we don't know what the GOT base is. Allow
2832 R_386_GOT32 for existing object files. */
2833 const char *name;
2834
2835 if (r_symndx < symtab_hdr->sh_info)
2836 {
2837 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
2838 r_symndx);
2839 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
2840 }
2841 else
2842 {
2843 indx = r_symndx - symtab_hdr->sh_info;
2844 h = elf_sym_hashes (abfd)[indx];
2845 BFD_ASSERT (h != NULL);
2846 name = h->root.root.string;
2847 }
2848
2849 (*_bfd_error_handler)
2850 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base register can not be used when making a shared object"),
2851 abfd, name);
2852 goto error_return;
2853 }
2854
2855 opcode = bfd_get_8 (abfd, contents + roff - 2);
2856
2857 /* It is OK to convert mov to lea. */
2858 if (opcode != 0x8b)
2859 {
2860 /* Only convert R_386_GOT32X relocation for call, jmp or
2861 one of adc, add, and, cmp, or, sbb, sub, test, xor
2862 instructions. */
2863 if (r_type != R_386_GOT32X)
2864 continue;
2865
2866 /* It is OK to convert indirect branch to direct branch. It
2867 is OK to convert adc, add, and, cmp, or, sbb, sub, test,
2868 xor only when PIC is false. */
2869 if (opcode != 0xff && bfd_link_pic (link_info))
2870 continue;
2871 }
2872
2873 /* Try to convert R_386_GOT32 and R_386_GOT32X. Get the symbol
2874 referred to by the reloc. */
2875 if (r_symndx < symtab_hdr->sh_info)
2876 {
2877 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
2878 abfd, r_symndx);
2879
2880 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2881 if (ELF_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
2882 continue;
2883
2884 h = NULL;
2885 if (opcode == 0x0ff)
2886 /* Convert "call/jmp *foo@GOT[(%reg)]". */
2887 goto convert_branch;
2888 else
2889 /* Convert "mov foo@GOT[(%reg1)], %reg2",
2890 "test %reg1, foo@GOT(%reg2)" and
2891 "binop foo@GOT[(%reg1)], %reg2". */
2892 goto convert_load;
2893 }
2894
2895 indx = r_symndx - symtab_hdr->sh_info;
2896 h = elf_sym_hashes (abfd)[indx];
2897 BFD_ASSERT (h != NULL);
2898
2899 while (h->root.type == bfd_link_hash_indirect
2900 || h->root.type == bfd_link_hash_warning)
2901 h = (struct elf_link_hash_entry *) h->root.u.i.link;
2902
2903 /* STT_GNU_IFUNC must keep GOT32 relocations. */
2904 if (h->type == STT_GNU_IFUNC)
2905 continue;
2906
2907 if (opcode == 0xff)
2908 {
2909 /* We have "call/jmp *foo@GOT[(%reg)]". */
2910 if ((h->root.type == bfd_link_hash_defined
2911 || h->root.type == bfd_link_hash_defweak)
2912 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2913 {
2914 /* The function is locally defined. */
2915 convert_branch:
2916 addend = bfd_get_32 (abfd, contents + roff);
2917 /* Addend for R_386_GOT32X relocation must be 0. */
2918 if (addend != 0)
2919 continue;
2920
2921 /* Convert R_386_GOT32X to R_386_PC32. */
2922 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
2923 {
2924 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
2925 is a nop prefix. */
2926 modrm = 0xe8;
2927 nop = link_info->call_nop_byte;
2928 if (link_info->call_nop_as_suffix)
2929 {
2930 nop_offset = roff + 3;
2931 irel->r_offset -= 1;
2932 }
2933 else
2934 nop_offset = roff - 2;
2935 }
2936 else
2937 {
2938 /* Convert to "jmp foo nop". */
2939 modrm = 0xe9;
2940 nop = NOP_OPCODE;
2941 nop_offset = roff + 3;
2942 irel->r_offset -= 1;
2943 }
2944
2945 bfd_put_8 (abfd, nop, contents + nop_offset);
2946 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
2947 /* When converting to PC-relative relocation, we
2948 need to adjust addend by -4. */
2949 bfd_put_32 (abfd, -4, contents + irel->r_offset);
2950 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
2951
2952 if (h)
2953 {
2954 if (h->got.refcount > 0)
2955 h->got.refcount -= 1;
2956 }
2957 else
2958 {
2959 if (local_got_refcounts != NULL
2960 && local_got_refcounts[r_symndx] > 0)
2961 local_got_refcounts[r_symndx] -= 1;
2962 }
2963
2964 changed_contents = TRUE;
2965 changed_relocs = TRUE;
2966 }
2967 }
2968 else
2969 {
2970 /* We have "mov foo@GOT[(%re1g)], %reg2",
2971 "test %reg1, foo@GOT(%reg2)" and
2972 "binop foo@GOT[(%reg1)], %reg2".
2973
2974 Avoid optimizing _DYNAMIC since ld.so may use its
2975 link-time address. */
2976 if (h == htab->elf.hdynamic)
2977 continue;
2978
2979 /* bfd_link_hash_new is set by an assignment in a linker
2980 script in bfd_elf_record_link_assignment. */
2981 if ((h->root.type == bfd_link_hash_defined
2982 || h->root.type == bfd_link_hash_defweak
2983 || h->root.type == bfd_link_hash_new)
2984 && SYMBOL_REFERENCES_LOCAL (link_info, h))
2985 {
2986 convert_load:
2987 if (opcode == 0x8b)
2988 {
2989 /* Convert "mov foo@GOT(%reg1), %reg2" to
2990 "lea foo@GOTOFF(%reg1), %reg2". */
2991 if (r_type == R_386_GOT32X
2992 && (baseless || !bfd_link_pic (link_info)))
2993 {
2994 r_type = R_386_32;
2995 /* For R_386_32, convert
2996 "lea foo@GOTOFF(%reg1), %reg2" to
2997 "lea foo@GOT, %reg2". */
2998 if (!baseless)
2999 {
3000 modrm = 0x5 | (modrm & 0x38);
3001 bfd_put_8 (abfd, modrm, contents + roff - 1);
3002 }
3003 }
3004 else
3005 r_type = R_386_GOTOFF;
3006 opcode = 0x8d;
3007 }
3008 else
3009 {
3010 /* Addend for R_386_GOT32X relocation must be 0. */
3011 addend = bfd_get_32 (abfd, contents + roff);
3012 if (addend != 0)
3013 continue;
3014
3015 if (opcode == 0x85)
3016 {
3017 /* Convert "test %reg1, foo@GOT(%reg2)" to
3018 "test $foo, %reg1". */
3019 modrm = 0xc0 | (modrm & 0x38) >> 3;
3020 opcode = 0xf7;
3021 }
3022 else
3023 {
3024 /* Convert "binop foo@GOT(%reg1), %reg2" to
3025 "binop $foo, %reg2". */
3026 modrm = (0xc0
3027 | (modrm & 0x38) >> 3
3028 | (opcode & 0x3c));
3029 opcode = 0x81;
3030 }
3031 bfd_put_8 (abfd, modrm, contents + roff - 1);
3032 r_type = R_386_32;
3033 }
3034
3035 bfd_put_8 (abfd, opcode, contents + roff - 2);
3036 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
3037
3038 if (h)
3039 {
3040 if (h->got.refcount > 0)
3041 h->got.refcount -= 1;
3042 }
3043 else
3044 {
3045 if (local_got_refcounts != NULL
3046 && local_got_refcounts[r_symndx] > 0)
3047 local_got_refcounts[r_symndx] -= 1;
3048 }
3049
3050 changed_contents = TRUE;
3051 changed_relocs = TRUE;
3052 }
3053 }
3054 }
3055
3056 if (contents != NULL
3057 && elf_section_data (sec)->this_hdr.contents != contents)
3058 {
3059 if (!changed_contents && !link_info->keep_memory)
3060 free (contents);
3061 else
3062 {
3063 /* Cache the section contents for elf_link_input_bfd. */
3064 elf_section_data (sec)->this_hdr.contents = contents;
3065 }
3066 }
3067
3068 if (elf_section_data (sec)->relocs != internal_relocs)
3069 {
3070 if (!changed_relocs)
3071 free (internal_relocs);
3072 else
3073 elf_section_data (sec)->relocs = internal_relocs;
3074 }
3075
3076 return TRUE;
3077
3078 error_return:
3079 if (contents != NULL
3080 && elf_section_data (sec)->this_hdr.contents != contents)
3081 free (contents);
3082 if (internal_relocs != NULL
3083 && elf_section_data (sec)->relocs != internal_relocs)
3084 free (internal_relocs);
3085 return FALSE;
3086 }
3087
3088 /* Set the sizes of the dynamic sections. */
3089
3090 static bfd_boolean
3091 elf_i386_size_dynamic_sections (bfd *output_bfd, struct bfd_link_info *info)
3092 {
3093 struct elf_i386_link_hash_table *htab;
3094 bfd *dynobj;
3095 asection *s;
3096 bfd_boolean relocs;
3097 bfd *ibfd;
3098
3099 htab = elf_i386_hash_table (info);
3100 if (htab == NULL)
3101 return FALSE;
3102 dynobj = htab->elf.dynobj;
3103 if (dynobj == NULL)
3104 abort ();
3105
3106 if (htab->elf.dynamic_sections_created)
3107 {
3108 /* Set the contents of the .interp section to the interpreter. */
3109 if (bfd_link_executable (info) && !info->nointerp)
3110 {
3111 s = bfd_get_linker_section (dynobj, ".interp");
3112 if (s == NULL)
3113 abort ();
3114 s->size = sizeof ELF_DYNAMIC_INTERPRETER;
3115 s->contents = (unsigned char *) ELF_DYNAMIC_INTERPRETER;
3116 }
3117 }
3118
3119 /* Set up .got offsets for local syms, and space for local dynamic
3120 relocs. */
3121 for (ibfd = info->input_bfds; ibfd != NULL; ibfd = ibfd->link.next)
3122 {
3123 bfd_signed_vma *local_got;
3124 bfd_signed_vma *end_local_got;
3125 char *local_tls_type;
3126 bfd_vma *local_tlsdesc_gotent;
3127 bfd_size_type locsymcount;
3128 Elf_Internal_Shdr *symtab_hdr;
3129 asection *srel;
3130
3131 if (! is_i386_elf (ibfd))
3132 continue;
3133
3134 for (s = ibfd->sections; s != NULL; s = s->next)
3135 {
3136 struct elf_dyn_relocs *p;
3137
3138 if (!elf_i386_convert_load (ibfd, s, info))
3139 return FALSE;
3140
3141 for (p = ((struct elf_dyn_relocs *)
3142 elf_section_data (s)->local_dynrel);
3143 p != NULL;
3144 p = p->next)
3145 {
3146 if (!bfd_is_abs_section (p->sec)
3147 && bfd_is_abs_section (p->sec->output_section))
3148 {
3149 /* Input section has been discarded, either because
3150 it is a copy of a linkonce section or due to
3151 linker script /DISCARD/, so we'll be discarding
3152 the relocs too. */
3153 }
3154 else if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3155 && strcmp (p->sec->output_section->name,
3156 ".tls_vars") == 0)
3157 {
3158 /* Relocations in vxworks .tls_vars sections are
3159 handled specially by the loader. */
3160 }
3161 else if (p->count != 0)
3162 {
3163 srel = elf_section_data (p->sec)->sreloc;
3164 srel->size += p->count * sizeof (Elf32_External_Rel);
3165 if ((p->sec->output_section->flags & SEC_READONLY) != 0
3166 && (info->flags & DF_TEXTREL) == 0)
3167 {
3168 info->flags |= DF_TEXTREL;
3169 if ((info->warn_shared_textrel && bfd_link_pic (info))
3170 || info->error_textrel)
3171 info->callbacks->einfo (_("%P: %B: warning: relocation in readonly section `%A'\n"),
3172 p->sec->owner, p->sec);
3173 }
3174 }
3175 }
3176 }
3177
3178 local_got = elf_local_got_refcounts (ibfd);
3179 if (!local_got)
3180 continue;
3181
3182 symtab_hdr = &elf_symtab_hdr (ibfd);
3183 locsymcount = symtab_hdr->sh_info;
3184 end_local_got = local_got + locsymcount;
3185 local_tls_type = elf_i386_local_got_tls_type (ibfd);
3186 local_tlsdesc_gotent = elf_i386_local_tlsdesc_gotent (ibfd);
3187 s = htab->elf.sgot;
3188 srel = htab->elf.srelgot;
3189 for (; local_got < end_local_got;
3190 ++local_got, ++local_tls_type, ++local_tlsdesc_gotent)
3191 {
3192 *local_tlsdesc_gotent = (bfd_vma) -1;
3193 if (*local_got > 0)
3194 {
3195 if (GOT_TLS_GDESC_P (*local_tls_type))
3196 {
3197 *local_tlsdesc_gotent = htab->elf.sgotplt->size
3198 - elf_i386_compute_jump_table_size (htab);
3199 htab->elf.sgotplt->size += 8;
3200 *local_got = (bfd_vma) -2;
3201 }
3202 if (! GOT_TLS_GDESC_P (*local_tls_type)
3203 || GOT_TLS_GD_P (*local_tls_type))
3204 {
3205 *local_got = s->size;
3206 s->size += 4;
3207 if (GOT_TLS_GD_P (*local_tls_type)
3208 || *local_tls_type == GOT_TLS_IE_BOTH)
3209 s->size += 4;
3210 }
3211 if (bfd_link_pic (info)
3212 || GOT_TLS_GD_ANY_P (*local_tls_type)
3213 || (*local_tls_type & GOT_TLS_IE))
3214 {
3215 if (*local_tls_type == GOT_TLS_IE_BOTH)
3216 srel->size += 2 * sizeof (Elf32_External_Rel);
3217 else if (GOT_TLS_GD_P (*local_tls_type)
3218 || ! GOT_TLS_GDESC_P (*local_tls_type))
3219 srel->size += sizeof (Elf32_External_Rel);
3220 if (GOT_TLS_GDESC_P (*local_tls_type))
3221 htab->elf.srelplt->size += sizeof (Elf32_External_Rel);
3222 }
3223 }
3224 else
3225 *local_got = (bfd_vma) -1;
3226 }
3227 }
3228
3229 if (htab->tls_ldm_got.refcount > 0)
3230 {
3231 /* Allocate 2 got entries and 1 dynamic reloc for R_386_TLS_LDM
3232 relocs. */
3233 htab->tls_ldm_got.offset = htab->elf.sgot->size;
3234 htab->elf.sgot->size += 8;
3235 htab->elf.srelgot->size += sizeof (Elf32_External_Rel);
3236 }
3237 else
3238 htab->tls_ldm_got.offset = -1;
3239
3240 /* Allocate global sym .plt and .got entries, and space for global
3241 sym dynamic relocs. */
3242 elf_link_hash_traverse (&htab->elf, elf_i386_allocate_dynrelocs, info);
3243
3244 /* Allocate .plt and .got entries, and space for local symbols. */
3245 htab_traverse (htab->loc_hash_table,
3246 elf_i386_allocate_local_dynrelocs,
3247 info);
3248
3249 /* For every jump slot reserved in the sgotplt, reloc_count is
3250 incremented. However, when we reserve space for TLS descriptors,
3251 it's not incremented, so in order to compute the space reserved
3252 for them, it suffices to multiply the reloc count by the jump
3253 slot size.
3254
3255 PR ld/13302: We start next_irelative_index at the end of .rela.plt
3256 so that R_386_IRELATIVE entries come last. */
3257 if (htab->elf.srelplt)
3258 {
3259 htab->next_tls_desc_index = htab->elf.srelplt->reloc_count;
3260 htab->sgotplt_jump_table_size = htab->next_tls_desc_index * 4;
3261 htab->next_irelative_index = htab->elf.srelplt->reloc_count - 1;
3262 }
3263 else if (htab->elf.irelplt)
3264 htab->next_irelative_index = htab->elf.irelplt->reloc_count - 1;
3265
3266
3267 if (htab->elf.sgotplt)
3268 {
3269 /* Don't allocate .got.plt section if there are no GOT nor PLT
3270 entries and there is no reference to _GLOBAL_OFFSET_TABLE_. */
3271 if ((htab->elf.hgot == NULL
3272 || !htab->elf.hgot->ref_regular_nonweak)
3273 && (htab->elf.sgotplt->size
3274 == get_elf_backend_data (output_bfd)->got_header_size)
3275 && (htab->elf.splt == NULL
3276 || htab->elf.splt->size == 0)
3277 && (htab->elf.sgot == NULL
3278 || htab->elf.sgot->size == 0)
3279 && (htab->elf.iplt == NULL
3280 || htab->elf.iplt->size == 0)
3281 && (htab->elf.igotplt == NULL
3282 || htab->elf.igotplt->size == 0))
3283 htab->elf.sgotplt->size = 0;
3284 }
3285
3286
3287 if (htab->plt_eh_frame != NULL
3288 && htab->elf.splt != NULL
3289 && htab->elf.splt->size != 0
3290 && !bfd_is_abs_section (htab->elf.splt->output_section)
3291 && _bfd_elf_eh_frame_present (info))
3292 htab->plt_eh_frame->size = sizeof (elf_i386_eh_frame_plt);
3293
3294 /* We now have determined the sizes of the various dynamic sections.
3295 Allocate memory for them. */
3296 relocs = FALSE;
3297 for (s = dynobj->sections; s != NULL; s = s->next)
3298 {
3299 bfd_boolean strip_section = TRUE;
3300
3301 if ((s->flags & SEC_LINKER_CREATED) == 0)
3302 continue;
3303
3304 if (s == htab->elf.splt
3305 || s == htab->elf.sgot)
3306 {
3307 /* Strip this section if we don't need it; see the
3308 comment below. */
3309 /* We'd like to strip these sections if they aren't needed, but if
3310 we've exported dynamic symbols from them we must leave them.
3311 It's too late to tell BFD to get rid of the symbols. */
3312
3313 if (htab->elf.hplt != NULL)
3314 strip_section = FALSE;
3315 }
3316 else if (s == htab->elf.sgotplt
3317 || s == htab->elf.iplt
3318 || s == htab->elf.igotplt
3319 || s == htab->plt_got
3320 || s == htab->plt_eh_frame
3321 || s == htab->sdynbss)
3322 {
3323 /* Strip these too. */
3324 }
3325 else if (CONST_STRNEQ (bfd_get_section_name (dynobj, s), ".rel"))
3326 {
3327 if (s->size != 0
3328 && s != htab->elf.srelplt
3329 && s != htab->srelplt2)
3330 relocs = TRUE;
3331
3332 /* We use the reloc_count field as a counter if we need
3333 to copy relocs into the output file. */
3334 s->reloc_count = 0;
3335 }
3336 else
3337 {
3338 /* It's not one of our sections, so don't allocate space. */
3339 continue;
3340 }
3341
3342 if (s->size == 0)
3343 {
3344 /* If we don't need this section, strip it from the
3345 output file. This is mostly to handle .rel.bss and
3346 .rel.plt. We must create both sections in
3347 create_dynamic_sections, because they must be created
3348 before the linker maps input sections to output
3349 sections. The linker does that before
3350 adjust_dynamic_symbol is called, and it is that
3351 function which decides whether anything needs to go
3352 into these sections. */
3353 if (strip_section)
3354 s->flags |= SEC_EXCLUDE;
3355 continue;
3356 }
3357
3358 if ((s->flags & SEC_HAS_CONTENTS) == 0)
3359 continue;
3360
3361 /* Allocate memory for the section contents. We use bfd_zalloc
3362 here in case unused entries are not reclaimed before the
3363 section's contents are written out. This should not happen,
3364 but this way if it does, we get a R_386_NONE reloc instead
3365 of garbage. */
3366 s->contents = (unsigned char *) bfd_zalloc (dynobj, s->size);
3367 if (s->contents == NULL)
3368 return FALSE;
3369 }
3370
3371 if (htab->plt_eh_frame != NULL
3372 && htab->plt_eh_frame->contents != NULL)
3373 {
3374 memcpy (htab->plt_eh_frame->contents, elf_i386_eh_frame_plt,
3375 sizeof (elf_i386_eh_frame_plt));
3376 bfd_put_32 (dynobj, htab->elf.splt->size,
3377 htab->plt_eh_frame->contents + PLT_FDE_LEN_OFFSET);
3378 }
3379
3380 if (htab->elf.dynamic_sections_created)
3381 {
3382 /* Add some entries to the .dynamic section. We fill in the
3383 values later, in elf_i386_finish_dynamic_sections, but we
3384 must add the entries now so that we get the correct size for
3385 the .dynamic section. The DT_DEBUG entry is filled in by the
3386 dynamic linker and used by the debugger. */
3387 #define add_dynamic_entry(TAG, VAL) \
3388 _bfd_elf_add_dynamic_entry (info, TAG, VAL)
3389
3390 if (bfd_link_executable (info))
3391 {
3392 if (!add_dynamic_entry (DT_DEBUG, 0))
3393 return FALSE;
3394 }
3395
3396 if (htab->elf.splt->size != 0)
3397 {
3398 /* DT_PLTGOT is used by prelink even if there is no PLT
3399 relocation. */
3400 if (!add_dynamic_entry (DT_PLTGOT, 0))
3401 return FALSE;
3402
3403 if (htab->elf.srelplt->size != 0)
3404 {
3405 if (!add_dynamic_entry (DT_PLTRELSZ, 0)
3406 || !add_dynamic_entry (DT_PLTREL, DT_REL)
3407 || !add_dynamic_entry (DT_JMPREL, 0))
3408 return FALSE;
3409 }
3410 }
3411
3412 if (relocs)
3413 {
3414 if (!add_dynamic_entry (DT_REL, 0)
3415 || !add_dynamic_entry (DT_RELSZ, 0)
3416 || !add_dynamic_entry (DT_RELENT, sizeof (Elf32_External_Rel)))
3417 return FALSE;
3418
3419 /* If any dynamic relocs apply to a read-only section,
3420 then we need a DT_TEXTREL entry. */
3421 if ((info->flags & DF_TEXTREL) == 0)
3422 elf_link_hash_traverse (&htab->elf,
3423 elf_i386_readonly_dynrelocs, info);
3424
3425 if ((info->flags & DF_TEXTREL) != 0)
3426 {
3427 if ((elf_tdata (output_bfd)->has_gnu_symbols
3428 & elf_gnu_symbol_ifunc) == elf_gnu_symbol_ifunc)
3429 {
3430 info->callbacks->einfo
3431 (_("%P%X: read-only segment has dynamic IFUNC relocations; recompile with -fPIC\n"));
3432 bfd_set_error (bfd_error_bad_value);
3433 return FALSE;
3434 }
3435
3436 if (!add_dynamic_entry (DT_TEXTREL, 0))
3437 return FALSE;
3438 }
3439 }
3440 if (get_elf_i386_backend_data (output_bfd)->is_vxworks
3441 && !elf_vxworks_add_dynamic_entries (output_bfd, info))
3442 return FALSE;
3443 }
3444 #undef add_dynamic_entry
3445
3446 return TRUE;
3447 }
3448
3449 static bfd_boolean
3450 elf_i386_always_size_sections (bfd *output_bfd,
3451 struct bfd_link_info *info)
3452 {
3453 asection *tls_sec = elf_hash_table (info)->tls_sec;
3454
3455 if (tls_sec)
3456 {
3457 struct elf_link_hash_entry *tlsbase;
3458
3459 tlsbase = elf_link_hash_lookup (elf_hash_table (info),
3460 "_TLS_MODULE_BASE_",
3461 FALSE, FALSE, FALSE);
3462
3463 if (tlsbase && tlsbase->type == STT_TLS)
3464 {
3465 struct elf_i386_link_hash_table *htab;
3466 struct bfd_link_hash_entry *bh = NULL;
3467 const struct elf_backend_data *bed
3468 = get_elf_backend_data (output_bfd);
3469
3470 htab = elf_i386_hash_table (info);
3471 if (htab == NULL)
3472 return FALSE;
3473
3474 if (!(_bfd_generic_link_add_one_symbol
3475 (info, output_bfd, "_TLS_MODULE_BASE_", BSF_LOCAL,
3476 tls_sec, 0, NULL, FALSE,
3477 bed->collect, &bh)))
3478 return FALSE;
3479
3480 htab->tls_module_base = bh;
3481
3482 tlsbase = (struct elf_link_hash_entry *)bh;
3483 tlsbase->def_regular = 1;
3484 tlsbase->other = STV_HIDDEN;
3485 tlsbase->root.linker_def = 1;
3486 (*bed->elf_backend_hide_symbol) (info, tlsbase, TRUE);
3487 }
3488 }
3489
3490 return TRUE;
3491 }
3492
3493 /* Set the correct type for an x86 ELF section. We do this by the
3494 section name, which is a hack, but ought to work. */
3495
3496 static bfd_boolean
3497 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
3498 Elf_Internal_Shdr *hdr,
3499 asection *sec)
3500 {
3501 const char *name;
3502
3503 name = bfd_get_section_name (abfd, sec);
3504
3505 /* This is an ugly, but unfortunately necessary hack that is
3506 needed when producing EFI binaries on x86. It tells
3507 elf.c:elf_fake_sections() not to consider ".reloc" as a section
3508 containing ELF relocation info. We need this hack in order to
3509 be able to generate ELF binaries that can be translated into
3510 EFI applications (which are essentially COFF objects). Those
3511 files contain a COFF ".reloc" section inside an ELFNN object,
3512 which would normally cause BFD to segfault because it would
3513 attempt to interpret this section as containing relocation
3514 entries for section "oc". With this hack enabled, ".reloc"
3515 will be treated as a normal data section, which will avoid the
3516 segfault. However, you won't be able to create an ELFNN binary
3517 with a section named "oc" that needs relocations, but that's
3518 the kind of ugly side-effects you get when detecting section
3519 types based on their names... In practice, this limitation is
3520 unlikely to bite. */
3521 if (strcmp (name, ".reloc") == 0)
3522 hdr->sh_type = SHT_PROGBITS;
3523
3524 return TRUE;
3525 }
3526
3527 /* _TLS_MODULE_BASE_ needs to be treated especially when linking
3528 executables. Rather than setting it to the beginning of the TLS
3529 section, we have to set it to the end. This function may be called
3530 multiple times, it is idempotent. */
3531
3532 static void
3533 elf_i386_set_tls_module_base (struct bfd_link_info *info)
3534 {
3535 struct elf_i386_link_hash_table *htab;
3536 struct bfd_link_hash_entry *base;
3537
3538 if (!bfd_link_executable (info))
3539 return;
3540
3541 htab = elf_i386_hash_table (info);
3542 if (htab == NULL)
3543 return;
3544
3545 base = htab->tls_module_base;
3546 if (base == NULL)
3547 return;
3548
3549 base->u.def.value = htab->elf.tls_size;
3550 }
3551
3552 /* Return the base VMA address which should be subtracted from real addresses
3553 when resolving @dtpoff relocation.
3554 This is PT_TLS segment p_vaddr. */
3555
3556 static bfd_vma
3557 elf_i386_dtpoff_base (struct bfd_link_info *info)
3558 {
3559 /* If tls_sec is NULL, we should have signalled an error already. */
3560 if (elf_hash_table (info)->tls_sec == NULL)
3561 return 0;
3562 return elf_hash_table (info)->tls_sec->vma;
3563 }
3564
3565 /* Return the relocation value for @tpoff relocation
3566 if STT_TLS virtual address is ADDRESS. */
3567
3568 static bfd_vma
3569 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
3570 {
3571 struct elf_link_hash_table *htab = elf_hash_table (info);
3572 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
3573 bfd_vma static_tls_size;
3574
3575 /* If tls_sec is NULL, we should have signalled an error already. */
3576 if (htab->tls_sec == NULL)
3577 return 0;
3578
3579 /* Consider special static TLS alignment requirements. */
3580 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
3581 return static_tls_size + htab->tls_sec->vma - address;
3582 }
3583
3584 /* Relocate an i386 ELF section. */
3585
3586 static bfd_boolean
3587 elf_i386_relocate_section (bfd *output_bfd,
3588 struct bfd_link_info *info,
3589 bfd *input_bfd,
3590 asection *input_section,
3591 bfd_byte *contents,
3592 Elf_Internal_Rela *relocs,
3593 Elf_Internal_Sym *local_syms,
3594 asection **local_sections)
3595 {
3596 struct elf_i386_link_hash_table *htab;
3597 Elf_Internal_Shdr *symtab_hdr;
3598 struct elf_link_hash_entry **sym_hashes;
3599 bfd_vma *local_got_offsets;
3600 bfd_vma *local_tlsdesc_gotents;
3601 Elf_Internal_Rela *rel;
3602 Elf_Internal_Rela *wrel;
3603 Elf_Internal_Rela *relend;
3604 bfd_boolean is_vxworks_tls;
3605 unsigned plt_entry_size;
3606
3607 BFD_ASSERT (is_i386_elf (input_bfd));
3608
3609 htab = elf_i386_hash_table (info);
3610 if (htab == NULL)
3611 return FALSE;
3612 symtab_hdr = &elf_symtab_hdr (input_bfd);
3613 sym_hashes = elf_sym_hashes (input_bfd);
3614 local_got_offsets = elf_local_got_offsets (input_bfd);
3615 local_tlsdesc_gotents = elf_i386_local_tlsdesc_gotent (input_bfd);
3616 /* We have to handle relocations in vxworks .tls_vars sections
3617 specially, because the dynamic loader is 'weird'. */
3618 is_vxworks_tls = (get_elf_i386_backend_data (output_bfd)->is_vxworks
3619 && bfd_link_pic (info)
3620 && !strcmp (input_section->output_section->name,
3621 ".tls_vars"));
3622
3623 elf_i386_set_tls_module_base (info);
3624
3625 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
3626
3627 rel = wrel = relocs;
3628 relend = relocs + input_section->reloc_count;
3629 for (; rel < relend; wrel++, rel++)
3630 {
3631 unsigned int r_type;
3632 reloc_howto_type *howto;
3633 unsigned long r_symndx;
3634 struct elf_link_hash_entry *h;
3635 struct elf_i386_link_hash_entry *eh;
3636 Elf_Internal_Sym *sym;
3637 asection *sec;
3638 bfd_vma off, offplt, plt_offset;
3639 bfd_vma relocation;
3640 bfd_boolean unresolved_reloc;
3641 bfd_reloc_status_type r;
3642 unsigned int indx;
3643 int tls_type;
3644 bfd_vma st_size;
3645 asection *resolved_plt;
3646
3647 r_type = ELF32_R_TYPE (rel->r_info);
3648 if (r_type == R_386_GNU_VTINHERIT
3649 || r_type == R_386_GNU_VTENTRY)
3650 continue;
3651
3652 if ((indx = r_type) >= R_386_standard
3653 && ((indx = r_type - R_386_ext_offset) - R_386_standard
3654 >= R_386_ext - R_386_standard)
3655 && ((indx = r_type - R_386_tls_offset) - R_386_ext
3656 >= R_386_ext2 - R_386_ext))
3657 {
3658 (*_bfd_error_handler)
3659 (_("%B: unrecognized relocation (0x%x) in section `%A'"),
3660 input_bfd, input_section, r_type);
3661 bfd_set_error (bfd_error_bad_value);
3662 return FALSE;
3663 }
3664 howto = elf_howto_table + indx;
3665
3666 r_symndx = ELF32_R_SYM (rel->r_info);
3667 h = NULL;
3668 sym = NULL;
3669 sec = NULL;
3670 unresolved_reloc = FALSE;
3671 if (r_symndx < symtab_hdr->sh_info)
3672 {
3673 sym = local_syms + r_symndx;
3674 sec = local_sections[r_symndx];
3675 relocation = (sec->output_section->vma
3676 + sec->output_offset
3677 + sym->st_value);
3678 st_size = sym->st_size;
3679
3680 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
3681 && ((sec->flags & SEC_MERGE) != 0
3682 || (bfd_link_relocatable (info)
3683 && sec->output_offset != 0)))
3684 {
3685 bfd_vma addend;
3686 bfd_byte *where = contents + rel->r_offset;
3687
3688 switch (howto->size)
3689 {
3690 case 0:
3691 addend = bfd_get_8 (input_bfd, where);
3692 if (howto->pc_relative)
3693 {
3694 addend = (addend ^ 0x80) - 0x80;
3695 addend += 1;
3696 }
3697 break;
3698 case 1:
3699 addend = bfd_get_16 (input_bfd, where);
3700 if (howto->pc_relative)
3701 {
3702 addend = (addend ^ 0x8000) - 0x8000;
3703 addend += 2;
3704 }
3705 break;
3706 case 2:
3707 addend = bfd_get_32 (input_bfd, where);
3708 if (howto->pc_relative)
3709 {
3710 addend = (addend ^ 0x80000000) - 0x80000000;
3711 addend += 4;
3712 }
3713 break;
3714 default:
3715 abort ();
3716 }
3717
3718 if (bfd_link_relocatable (info))
3719 addend += sec->output_offset;
3720 else
3721 {
3722 asection *msec = sec;
3723 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
3724 addend);
3725 addend -= relocation;
3726 addend += msec->output_section->vma + msec->output_offset;
3727 }
3728
3729 switch (howto->size)
3730 {
3731 case 0:
3732 /* FIXME: overflow checks. */
3733 if (howto->pc_relative)
3734 addend -= 1;
3735 bfd_put_8 (input_bfd, addend, where);
3736 break;
3737 case 1:
3738 if (howto->pc_relative)
3739 addend -= 2;
3740 bfd_put_16 (input_bfd, addend, where);
3741 break;
3742 case 2:
3743 if (howto->pc_relative)
3744 addend -= 4;
3745 bfd_put_32 (input_bfd, addend, where);
3746 break;
3747 }
3748 }
3749 else if (!bfd_link_relocatable (info)
3750 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
3751 {
3752 /* Relocate against local STT_GNU_IFUNC symbol. */
3753 h = elf_i386_get_local_sym_hash (htab, input_bfd, rel,
3754 FALSE);
3755 if (h == NULL)
3756 abort ();
3757
3758 /* Set STT_GNU_IFUNC symbol value. */
3759 h->root.u.def.value = sym->st_value;
3760 h->root.u.def.section = sec;
3761 }
3762 }
3763 else
3764 {
3765 bfd_boolean warned ATTRIBUTE_UNUSED;
3766 bfd_boolean ignored ATTRIBUTE_UNUSED;
3767
3768 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
3769 r_symndx, symtab_hdr, sym_hashes,
3770 h, sec, relocation,
3771 unresolved_reloc, warned, ignored);
3772 st_size = h->size;
3773 }
3774
3775 if (sec != NULL && discarded_section (sec))
3776 {
3777 _bfd_clear_contents (howto, input_bfd, input_section,
3778 contents + rel->r_offset);
3779 wrel->r_offset = rel->r_offset;
3780 wrel->r_info = 0;
3781 wrel->r_addend = 0;
3782
3783 /* For ld -r, remove relocations in debug sections against
3784 sections defined in discarded sections. Not done for
3785 eh_frame editing code expects to be present. */
3786 if (bfd_link_relocatable (info)
3787 && (input_section->flags & SEC_DEBUGGING))
3788 wrel--;
3789
3790 continue;
3791 }
3792
3793 if (bfd_link_relocatable (info))
3794 {
3795 if (wrel != rel)
3796 *wrel = *rel;
3797 continue;
3798 }
3799
3800 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
3801 it here if it is defined in a non-shared object. */
3802 if (h != NULL
3803 && h->type == STT_GNU_IFUNC
3804 && h->def_regular)
3805 {
3806 asection *plt, *gotplt, *base_got;
3807 bfd_vma plt_index;
3808 const char *name;
3809
3810 if ((input_section->flags & SEC_ALLOC) == 0)
3811 {
3812 /* Dynamic relocs are not propagated for SEC_DEBUGGING
3813 sections because such sections are not SEC_ALLOC and
3814 thus ld.so will not process them. */
3815 if ((input_section->flags & SEC_DEBUGGING) != 0)
3816 continue;
3817 abort ();
3818 }
3819 else if (h->plt.offset == (bfd_vma) -1)
3820 abort ();
3821
3822 /* STT_GNU_IFUNC symbol must go through PLT. */
3823 if (htab->elf.splt != NULL)
3824 {
3825 plt = htab->elf.splt;
3826 gotplt = htab->elf.sgotplt;
3827 }
3828 else
3829 {
3830 plt = htab->elf.iplt;
3831 gotplt = htab->elf.igotplt;
3832 }
3833
3834 relocation = (plt->output_section->vma
3835 + plt->output_offset + h->plt.offset);
3836
3837 switch (r_type)
3838 {
3839 default:
3840 if (h->root.root.string)
3841 name = h->root.root.string;
3842 else
3843 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
3844 NULL);
3845 (*_bfd_error_handler)
3846 (_("%B: relocation %s against STT_GNU_IFUNC "
3847 "symbol `%s' isn't handled by %s"), input_bfd,
3848 elf_howto_table[r_type].name,
3849 name, __FUNCTION__);
3850 bfd_set_error (bfd_error_bad_value);
3851 return FALSE;
3852
3853 case R_386_32:
3854 /* Generate dynamic relcoation only when there is a
3855 non-GOT reference in a shared object. */
3856 if (bfd_link_pic (info) && h->non_got_ref)
3857 {
3858 Elf_Internal_Rela outrel;
3859 asection *sreloc;
3860 bfd_vma offset;
3861
3862 /* Need a dynamic relocation to get the real function
3863 adddress. */
3864 offset = _bfd_elf_section_offset (output_bfd,
3865 info,
3866 input_section,
3867 rel->r_offset);
3868 if (offset == (bfd_vma) -1
3869 || offset == (bfd_vma) -2)
3870 abort ();
3871
3872 outrel.r_offset = (input_section->output_section->vma
3873 + input_section->output_offset
3874 + offset);
3875
3876 if (h->dynindx == -1
3877 || h->forced_local
3878 || bfd_link_executable (info))
3879 {
3880 /* This symbol is resolved locally. */
3881 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3882 bfd_put_32 (output_bfd,
3883 (h->root.u.def.value
3884 + h->root.u.def.section->output_section->vma
3885 + h->root.u.def.section->output_offset),
3886 contents + offset);
3887 }
3888 else
3889 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
3890
3891 sreloc = htab->elf.irelifunc;
3892 elf_append_rel (output_bfd, sreloc, &outrel);
3893
3894 /* If this reloc is against an external symbol, we
3895 do not want to fiddle with the addend. Otherwise,
3896 we need to include the symbol value so that it
3897 becomes an addend for the dynamic reloc. For an
3898 internal symbol, we have updated addend. */
3899 continue;
3900 }
3901 /* FALLTHROUGH */
3902 case R_386_PC32:
3903 case R_386_PLT32:
3904 goto do_relocation;
3905
3906 case R_386_GOT32:
3907 case R_386_GOT32X:
3908 base_got = htab->elf.sgot;
3909 off = h->got.offset;
3910
3911 if (base_got == NULL)
3912 abort ();
3913
3914 if (off == (bfd_vma) -1)
3915 {
3916 /* We can't use h->got.offset here to save state, or
3917 even just remember the offset, as finish_dynamic_symbol
3918 would use that as offset into .got. */
3919
3920 if (htab->elf.splt != NULL)
3921 {
3922 plt_index = h->plt.offset / plt_entry_size - 1;
3923 off = (plt_index + 3) * 4;
3924 base_got = htab->elf.sgotplt;
3925 }
3926 else
3927 {
3928 plt_index = h->plt.offset / plt_entry_size;
3929 off = plt_index * 4;
3930 base_got = htab->elf.igotplt;
3931 }
3932
3933 if (h->dynindx == -1
3934 || h->forced_local
3935 || info->symbolic)
3936 {
3937 /* This references the local defitionion. We must
3938 initialize this entry in the global offset table.
3939 Since the offset must always be a multiple of 8,
3940 we use the least significant bit to record
3941 whether we have initialized it already.
3942
3943 When doing a dynamic link, we create a .rela.got
3944 relocation entry to initialize the value. This
3945 is done in the finish_dynamic_symbol routine. */
3946 if ((off & 1) != 0)
3947 off &= ~1;
3948 else
3949 {
3950 bfd_put_32 (output_bfd, relocation,
3951 base_got->contents + off);
3952 h->got.offset |= 1;
3953 }
3954 }
3955
3956 relocation = off;
3957
3958 /* Adjust for static executables. */
3959 if (htab->elf.splt == NULL)
3960 relocation += gotplt->output_offset;
3961 }
3962 else
3963 {
3964 relocation = (base_got->output_section->vma
3965 + base_got->output_offset + off
3966 - gotplt->output_section->vma
3967 - gotplt->output_offset);
3968 /* Adjust for static executables. */
3969 if (htab->elf.splt == NULL)
3970 relocation += gotplt->output_offset;
3971 }
3972
3973 goto do_relocation;
3974
3975 case R_386_GOTOFF:
3976 relocation -= (gotplt->output_section->vma
3977 + gotplt->output_offset);
3978 goto do_relocation;
3979 }
3980 }
3981
3982 eh = (struct elf_i386_link_hash_entry *) h;
3983 switch (r_type)
3984 {
3985 case R_386_GOT32X:
3986 /* Avoid optimizing _DYNAMIC since ld.so may use its
3987 link-time address. */
3988 if (h == htab->elf.hdynamic)
3989 goto r_386_got32;
3990
3991 if (bfd_link_pic (info))
3992 {
3993 /* It is OK to convert mov to lea and convert indirect
3994 branch to direct branch. It is OK to convert adc,
3995 add, and, cmp, or, sbb, sub, test, xor only when PIC
3996 is false. */
3997 unsigned int opcode;
3998 opcode = bfd_get_8 (abfd, contents + rel->r_offset - 2);
3999 if (opcode != 0x8b && opcode != 0xff)
4000 goto r_386_got32;
4001 }
4002
4003 /* Resolve "mov GOT[(%reg)], %reg",
4004 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
4005 and "binop foo@GOT[(%reg)], %reg". */
4006 if (h == NULL
4007 || (h->plt.offset == (bfd_vma) -1
4008 && h->got.offset == (bfd_vma) -1)
4009 || htab->elf.sgotplt == NULL)
4010 abort ();
4011
4012 offplt = (htab->elf.sgotplt->output_section->vma
4013 + htab->elf.sgotplt->output_offset);
4014
4015 /* It is relative to .got.plt section. */
4016 if (h->got.offset != (bfd_vma) -1)
4017 /* Use GOT entry. */
4018 relocation = (htab->elf.sgot->output_section->vma
4019 + htab->elf.sgot->output_offset
4020 + h->got.offset - offplt);
4021 else
4022 /* Use GOTPLT entry. */
4023 relocation = (h->plt.offset / plt_entry_size - 1 + 3) * 4;
4024
4025 if (!bfd_link_pic (info))
4026 {
4027 /* If not PIC, add the .got.plt section address for
4028 baseless addressing. */
4029 unsigned int modrm;
4030 modrm = bfd_get_8 (abfd, contents + rel->r_offset - 1);
4031 if ((modrm & 0xc7) == 0x5)
4032 relocation += offplt;
4033 }
4034
4035 unresolved_reloc = FALSE;
4036 break;
4037
4038 case R_386_GOT32:
4039 r_386_got32:
4040 /* Relocation is to the entry for this symbol in the global
4041 offset table. */
4042 if (htab->elf.sgot == NULL)
4043 abort ();
4044
4045 if (h != NULL)
4046 {
4047 bfd_boolean dyn;
4048
4049 off = h->got.offset;
4050 dyn = htab->elf.dynamic_sections_created;
4051 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
4052 bfd_link_pic (info),
4053 h)
4054 || (bfd_link_pic (info)
4055 && SYMBOL_REFERENCES_LOCAL (info, h))
4056 || (ELF_ST_VISIBILITY (h->other)
4057 && h->root.type == bfd_link_hash_undefweak))
4058 {
4059 /* This is actually a static link, or it is a
4060 -Bsymbolic link and the symbol is defined
4061 locally, or the symbol was forced to be local
4062 because of a version file. We must initialize
4063 this entry in the global offset table. Since the
4064 offset must always be a multiple of 4, we use the
4065 least significant bit to record whether we have
4066 initialized it already.
4067
4068 When doing a dynamic link, we create a .rel.got
4069 relocation entry to initialize the value. This
4070 is done in the finish_dynamic_symbol routine. */
4071 if ((off & 1) != 0)
4072 off &= ~1;
4073 else
4074 {
4075 bfd_put_32 (output_bfd, relocation,
4076 htab->elf.sgot->contents + off);
4077 h->got.offset |= 1;
4078 }
4079 }
4080 else
4081 unresolved_reloc = FALSE;
4082 }
4083 else
4084 {
4085 if (local_got_offsets == NULL)
4086 abort ();
4087
4088 off = local_got_offsets[r_symndx];
4089
4090 /* The offset must always be a multiple of 4. We use
4091 the least significant bit to record whether we have
4092 already generated the necessary reloc. */
4093 if ((off & 1) != 0)
4094 off &= ~1;
4095 else
4096 {
4097 bfd_put_32 (output_bfd, relocation,
4098 htab->elf.sgot->contents + off);
4099
4100 if (bfd_link_pic (info))
4101 {
4102 asection *s;
4103 Elf_Internal_Rela outrel;
4104
4105 s = htab->elf.srelgot;
4106 if (s == NULL)
4107 abort ();
4108
4109 outrel.r_offset = (htab->elf.sgot->output_section->vma
4110 + htab->elf.sgot->output_offset
4111 + off);
4112 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4113 elf_append_rel (output_bfd, s, &outrel);
4114 }
4115
4116 local_got_offsets[r_symndx] |= 1;
4117 }
4118 }
4119
4120 if (off >= (bfd_vma) -2)
4121 abort ();
4122
4123 relocation = htab->elf.sgot->output_section->vma
4124 + htab->elf.sgot->output_offset + off
4125 - htab->elf.sgotplt->output_section->vma
4126 - htab->elf.sgotplt->output_offset;
4127 break;
4128
4129 case R_386_GOTOFF:
4130 /* Relocation is relative to the start of the global offset
4131 table. */
4132
4133 /* Check to make sure it isn't a protected function or data
4134 symbol for shared library since it may not be local when
4135 used as function address or with copy relocation. We also
4136 need to make sure that a symbol is referenced locally. */
4137 if (!bfd_link_executable (info) && h)
4138 {
4139 if (!h->def_regular)
4140 {
4141 const char *v;
4142
4143 switch (ELF_ST_VISIBILITY (h->other))
4144 {
4145 case STV_HIDDEN:
4146 v = _("hidden symbol");
4147 break;
4148 case STV_INTERNAL:
4149 v = _("internal symbol");
4150 break;
4151 case STV_PROTECTED:
4152 v = _("protected symbol");
4153 break;
4154 default:
4155 v = _("symbol");
4156 break;
4157 }
4158
4159 (*_bfd_error_handler)
4160 (_("%B: relocation R_386_GOTOFF against undefined %s `%s' can not be used when making a shared object"),
4161 input_bfd, v, h->root.root.string);
4162 bfd_set_error (bfd_error_bad_value);
4163 return FALSE;
4164 }
4165 else if (!SYMBOL_REFERENCES_LOCAL (info, h)
4166 && (h->type == STT_FUNC
4167 || h->type == STT_OBJECT)
4168 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
4169 {
4170 (*_bfd_error_handler)
4171 (_("%B: relocation R_386_GOTOFF against protected %s `%s' can not be used when making a shared object"),
4172 input_bfd,
4173 h->type == STT_FUNC ? "function" : "data",
4174 h->root.root.string);
4175 bfd_set_error (bfd_error_bad_value);
4176 return FALSE;
4177 }
4178 }
4179
4180 /* Note that sgot is not involved in this
4181 calculation. We always want the start of .got.plt. If we
4182 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
4183 permitted by the ABI, we might have to change this
4184 calculation. */
4185 relocation -= htab->elf.sgotplt->output_section->vma
4186 + htab->elf.sgotplt->output_offset;
4187 break;
4188
4189 case R_386_GOTPC:
4190 /* Use global offset table as symbol value. */
4191 relocation = htab->elf.sgotplt->output_section->vma
4192 + htab->elf.sgotplt->output_offset;
4193 unresolved_reloc = FALSE;
4194 break;
4195
4196 case R_386_PLT32:
4197 /* Relocation is to the entry for this symbol in the
4198 procedure linkage table. */
4199
4200 /* Resolve a PLT32 reloc against a local symbol directly,
4201 without using the procedure linkage table. */
4202 if (h == NULL)
4203 break;
4204
4205 if ((h->plt.offset == (bfd_vma) -1
4206 && eh->plt_got.offset == (bfd_vma) -1)
4207 || htab->elf.splt == NULL)
4208 {
4209 /* We didn't make a PLT entry for this symbol. This
4210 happens when statically linking PIC code, or when
4211 using -Bsymbolic. */
4212 break;
4213 }
4214
4215 if (h->plt.offset != (bfd_vma) -1)
4216 {
4217 resolved_plt = htab->elf.splt;
4218 plt_offset = h->plt.offset;
4219 }
4220 else
4221 {
4222 resolved_plt = htab->plt_got;
4223 plt_offset = eh->plt_got.offset;
4224 }
4225
4226 relocation = (resolved_plt->output_section->vma
4227 + resolved_plt->output_offset
4228 + plt_offset);
4229 unresolved_reloc = FALSE;
4230 break;
4231
4232 case R_386_SIZE32:
4233 /* Set to symbol size. */
4234 relocation = st_size;
4235 /* Fall through. */
4236
4237 case R_386_32:
4238 case R_386_PC32:
4239 if ((input_section->flags & SEC_ALLOC) == 0
4240 || is_vxworks_tls)
4241 break;
4242
4243 /* Copy dynamic function pointer relocations. */
4244 if ((bfd_link_pic (info)
4245 && (h == NULL
4246 || ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
4247 || h->root.type != bfd_link_hash_undefweak)
4248 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
4249 || !SYMBOL_CALLS_LOCAL (info, h)))
4250 || (ELIMINATE_COPY_RELOCS
4251 && !bfd_link_pic (info)
4252 && h != NULL
4253 && h->dynindx != -1
4254 && (!h->non_got_ref || eh->func_pointer_refcount > 0)
4255 && ((h->def_dynamic
4256 && !h->def_regular)
4257 || h->root.type == bfd_link_hash_undefweak
4258 || h->root.type == bfd_link_hash_undefined)))
4259 {
4260 Elf_Internal_Rela outrel;
4261 bfd_boolean skip, relocate;
4262 asection *sreloc;
4263
4264 /* When generating a shared object, these relocations
4265 are copied into the output file to be resolved at run
4266 time. */
4267
4268 skip = FALSE;
4269 relocate = FALSE;
4270
4271 outrel.r_offset =
4272 _bfd_elf_section_offset (output_bfd, info, input_section,
4273 rel->r_offset);
4274 if (outrel.r_offset == (bfd_vma) -1)
4275 skip = TRUE;
4276 else if (outrel.r_offset == (bfd_vma) -2)
4277 skip = TRUE, relocate = TRUE;
4278 outrel.r_offset += (input_section->output_section->vma
4279 + input_section->output_offset);
4280
4281 if (skip)
4282 memset (&outrel, 0, sizeof outrel);
4283 else if (h != NULL
4284 && h->dynindx != -1
4285 && (r_type == R_386_PC32
4286 || !bfd_link_pic (info)
4287 || !SYMBOLIC_BIND (info, h)
4288 || !h->def_regular))
4289 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
4290 else
4291 {
4292 /* This symbol is local, or marked to become local. */
4293 relocate = TRUE;
4294 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4295 }
4296
4297 sreloc = elf_section_data (input_section)->sreloc;
4298
4299 if (sreloc == NULL || sreloc->contents == NULL)
4300 {
4301 r = bfd_reloc_notsupported;
4302 goto check_relocation_error;
4303 }
4304
4305 elf_append_rel (output_bfd, sreloc, &outrel);
4306
4307 /* If this reloc is against an external symbol, we do
4308 not want to fiddle with the addend. Otherwise, we
4309 need to include the symbol value so that it becomes
4310 an addend for the dynamic reloc. */
4311 if (! relocate)
4312 continue;
4313 }
4314 break;
4315
4316 case R_386_TLS_IE:
4317 if (!bfd_link_executable (info))
4318 {
4319 Elf_Internal_Rela outrel;
4320 asection *sreloc;
4321
4322 outrel.r_offset = rel->r_offset
4323 + input_section->output_section->vma
4324 + input_section->output_offset;
4325 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
4326 sreloc = elf_section_data (input_section)->sreloc;
4327 if (sreloc == NULL)
4328 abort ();
4329 elf_append_rel (output_bfd, sreloc, &outrel);
4330 }
4331 /* Fall through */
4332
4333 case R_386_TLS_GD:
4334 case R_386_TLS_GOTDESC:
4335 case R_386_TLS_DESC_CALL:
4336 case R_386_TLS_IE_32:
4337 case R_386_TLS_GOTIE:
4338 tls_type = GOT_UNKNOWN;
4339 if (h == NULL && local_got_offsets)
4340 tls_type = elf_i386_local_got_tls_type (input_bfd) [r_symndx];
4341 else if (h != NULL)
4342 tls_type = elf_i386_hash_entry(h)->tls_type;
4343 if (tls_type == GOT_TLS_IE)
4344 tls_type = GOT_TLS_IE_NEG;
4345
4346 if (! elf_i386_tls_transition (info, input_bfd,
4347 input_section, contents,
4348 symtab_hdr, sym_hashes,
4349 &r_type, tls_type, rel,
4350 relend, h, r_symndx))
4351 return FALSE;
4352
4353 if (r_type == R_386_TLS_LE_32)
4354 {
4355 BFD_ASSERT (! unresolved_reloc);
4356 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4357 {
4358 unsigned int type;
4359 bfd_vma roff;
4360
4361 /* GD->LE transition. */
4362 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4363 if (type == 0x04)
4364 {
4365 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4366 Change it into:
4367 movl %gs:0, %eax; subl $foo@tpoff, %eax
4368 (6 byte form of subl). */
4369 memcpy (contents + rel->r_offset - 3,
4370 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4371 roff = rel->r_offset + 5;
4372 }
4373 else
4374 {
4375 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4376 Change it into:
4377 movl %gs:0, %eax; subl $foo@tpoff, %eax
4378 (6 byte form of subl). */
4379 memcpy (contents + rel->r_offset - 2,
4380 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
4381 roff = rel->r_offset + 6;
4382 }
4383 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4384 contents + roff);
4385 /* Skip R_386_PC32/R_386_PLT32. */
4386 rel++;
4387 wrel++;
4388 continue;
4389 }
4390 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4391 {
4392 /* GDesc -> LE transition.
4393 It's originally something like:
4394 leal x@tlsdesc(%ebx), %eax
4395
4396 leal x@ntpoff, %eax
4397
4398 Registers other than %eax may be set up here. */
4399
4400 unsigned int val;
4401 bfd_vma roff;
4402
4403 roff = rel->r_offset;
4404 val = bfd_get_8 (input_bfd, contents + roff - 1);
4405
4406 /* Now modify the instruction as appropriate. */
4407 /* aoliva FIXME: remove the above and xor the byte
4408 below with 0x86. */
4409 bfd_put_8 (output_bfd, val ^ 0x86,
4410 contents + roff - 1);
4411 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4412 contents + roff);
4413 continue;
4414 }
4415 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4416 {
4417 /* GDesc -> LE transition.
4418 It's originally:
4419 call *(%eax)
4420 Turn it into:
4421 xchg %ax,%ax */
4422
4423 bfd_vma roff;
4424
4425 roff = rel->r_offset;
4426 bfd_put_8 (output_bfd, 0x66, contents + roff);
4427 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4428 continue;
4429 }
4430 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_IE)
4431 {
4432 unsigned int val;
4433
4434 /* IE->LE transition:
4435 Originally it can be one of:
4436 movl foo, %eax
4437 movl foo, %reg
4438 addl foo, %reg
4439 We change it into:
4440 movl $foo, %eax
4441 movl $foo, %reg
4442 addl $foo, %reg. */
4443 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4444 if (val == 0xa1)
4445 {
4446 /* movl foo, %eax. */
4447 bfd_put_8 (output_bfd, 0xb8,
4448 contents + rel->r_offset - 1);
4449 }
4450 else
4451 {
4452 unsigned int type;
4453
4454 type = bfd_get_8 (input_bfd,
4455 contents + rel->r_offset - 2);
4456 switch (type)
4457 {
4458 case 0x8b:
4459 /* movl */
4460 bfd_put_8 (output_bfd, 0xc7,
4461 contents + rel->r_offset - 2);
4462 bfd_put_8 (output_bfd,
4463 0xc0 | ((val >> 3) & 7),
4464 contents + rel->r_offset - 1);
4465 break;
4466 case 0x03:
4467 /* addl */
4468 bfd_put_8 (output_bfd, 0x81,
4469 contents + rel->r_offset - 2);
4470 bfd_put_8 (output_bfd,
4471 0xc0 | ((val >> 3) & 7),
4472 contents + rel->r_offset - 1);
4473 break;
4474 default:
4475 BFD_FAIL ();
4476 break;
4477 }
4478 }
4479 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4480 contents + rel->r_offset);
4481 continue;
4482 }
4483 else
4484 {
4485 unsigned int val, type;
4486
4487 /* {IE_32,GOTIE}->LE transition:
4488 Originally it can be one of:
4489 subl foo(%reg1), %reg2
4490 movl foo(%reg1), %reg2
4491 addl foo(%reg1), %reg2
4492 We change it into:
4493 subl $foo, %reg2
4494 movl $foo, %reg2 (6 byte form)
4495 addl $foo, %reg2. */
4496 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4497 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4498 if (type == 0x8b)
4499 {
4500 /* movl */
4501 bfd_put_8 (output_bfd, 0xc7,
4502 contents + rel->r_offset - 2);
4503 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4504 contents + rel->r_offset - 1);
4505 }
4506 else if (type == 0x2b)
4507 {
4508 /* subl */
4509 bfd_put_8 (output_bfd, 0x81,
4510 contents + rel->r_offset - 2);
4511 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
4512 contents + rel->r_offset - 1);
4513 }
4514 else if (type == 0x03)
4515 {
4516 /* addl */
4517 bfd_put_8 (output_bfd, 0x81,
4518 contents + rel->r_offset - 2);
4519 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
4520 contents + rel->r_offset - 1);
4521 }
4522 else
4523 BFD_FAIL ();
4524 if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTIE)
4525 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
4526 contents + rel->r_offset);
4527 else
4528 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
4529 contents + rel->r_offset);
4530 continue;
4531 }
4532 }
4533
4534 if (htab->elf.sgot == NULL)
4535 abort ();
4536
4537 if (h != NULL)
4538 {
4539 off = h->got.offset;
4540 offplt = elf_i386_hash_entry (h)->tlsdesc_got;
4541 }
4542 else
4543 {
4544 if (local_got_offsets == NULL)
4545 abort ();
4546
4547 off = local_got_offsets[r_symndx];
4548 offplt = local_tlsdesc_gotents[r_symndx];
4549 }
4550
4551 if ((off & 1) != 0)
4552 off &= ~1;
4553 else
4554 {
4555 Elf_Internal_Rela outrel;
4556 int dr_type;
4557 asection *sreloc;
4558
4559 if (htab->elf.srelgot == NULL)
4560 abort ();
4561
4562 indx = h && h->dynindx != -1 ? h->dynindx : 0;
4563
4564 if (GOT_TLS_GDESC_P (tls_type))
4565 {
4566 bfd_byte *loc;
4567 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
4568 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
4569 <= htab->elf.sgotplt->size);
4570 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
4571 + htab->elf.sgotplt->output_offset
4572 + offplt
4573 + htab->sgotplt_jump_table_size);
4574 sreloc = htab->elf.srelplt;
4575 loc = sreloc->contents;
4576 loc += (htab->next_tls_desc_index++
4577 * sizeof (Elf32_External_Rel));
4578 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
4579 <= sreloc->contents + sreloc->size);
4580 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
4581 if (indx == 0)
4582 {
4583 BFD_ASSERT (! unresolved_reloc);
4584 bfd_put_32 (output_bfd,
4585 relocation - elf_i386_dtpoff_base (info),
4586 htab->elf.sgotplt->contents + offplt
4587 + htab->sgotplt_jump_table_size + 4);
4588 }
4589 else
4590 {
4591 bfd_put_32 (output_bfd, 0,
4592 htab->elf.sgotplt->contents + offplt
4593 + htab->sgotplt_jump_table_size + 4);
4594 }
4595 }
4596
4597 sreloc = htab->elf.srelgot;
4598
4599 outrel.r_offset = (htab->elf.sgot->output_section->vma
4600 + htab->elf.sgot->output_offset + off);
4601
4602 if (GOT_TLS_GD_P (tls_type))
4603 dr_type = R_386_TLS_DTPMOD32;
4604 else if (GOT_TLS_GDESC_P (tls_type))
4605 goto dr_done;
4606 else if (tls_type == GOT_TLS_IE_POS)
4607 dr_type = R_386_TLS_TPOFF;
4608 else
4609 dr_type = R_386_TLS_TPOFF32;
4610
4611 if (dr_type == R_386_TLS_TPOFF && indx == 0)
4612 bfd_put_32 (output_bfd,
4613 relocation - elf_i386_dtpoff_base (info),
4614 htab->elf.sgot->contents + off);
4615 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
4616 bfd_put_32 (output_bfd,
4617 elf_i386_dtpoff_base (info) - relocation,
4618 htab->elf.sgot->contents + off);
4619 else if (dr_type != R_386_TLS_DESC)
4620 bfd_put_32 (output_bfd, 0,
4621 htab->elf.sgot->contents + off);
4622 outrel.r_info = ELF32_R_INFO (indx, dr_type);
4623
4624 elf_append_rel (output_bfd, sreloc, &outrel);
4625
4626 if (GOT_TLS_GD_P (tls_type))
4627 {
4628 if (indx == 0)
4629 {
4630 BFD_ASSERT (! unresolved_reloc);
4631 bfd_put_32 (output_bfd,
4632 relocation - elf_i386_dtpoff_base (info),
4633 htab->elf.sgot->contents + off + 4);
4634 }
4635 else
4636 {
4637 bfd_put_32 (output_bfd, 0,
4638 htab->elf.sgot->contents + off + 4);
4639 outrel.r_info = ELF32_R_INFO (indx,
4640 R_386_TLS_DTPOFF32);
4641 outrel.r_offset += 4;
4642 elf_append_rel (output_bfd, sreloc, &outrel);
4643 }
4644 }
4645 else if (tls_type == GOT_TLS_IE_BOTH)
4646 {
4647 bfd_put_32 (output_bfd,
4648 (indx == 0
4649 ? relocation - elf_i386_dtpoff_base (info)
4650 : 0),
4651 htab->elf.sgot->contents + off + 4);
4652 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4653 outrel.r_offset += 4;
4654 elf_append_rel (output_bfd, sreloc, &outrel);
4655 }
4656
4657 dr_done:
4658 if (h != NULL)
4659 h->got.offset |= 1;
4660 else
4661 local_got_offsets[r_symndx] |= 1;
4662 }
4663
4664 if (off >= (bfd_vma) -2
4665 && ! GOT_TLS_GDESC_P (tls_type))
4666 abort ();
4667 if (r_type == R_386_TLS_GOTDESC
4668 || r_type == R_386_TLS_DESC_CALL)
4669 {
4670 relocation = htab->sgotplt_jump_table_size + offplt;
4671 unresolved_reloc = FALSE;
4672 }
4673 else if (r_type == ELF32_R_TYPE (rel->r_info))
4674 {
4675 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
4676 + htab->elf.sgotplt->output_offset;
4677 relocation = htab->elf.sgot->output_section->vma
4678 + htab->elf.sgot->output_offset + off - g_o_t;
4679 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
4680 && tls_type == GOT_TLS_IE_BOTH)
4681 relocation += 4;
4682 if (r_type == R_386_TLS_IE)
4683 relocation += g_o_t;
4684 unresolved_reloc = FALSE;
4685 }
4686 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GD)
4687 {
4688 unsigned int val, type;
4689 bfd_vma roff;
4690
4691 /* GD->IE transition. */
4692 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
4693 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
4694 if (type == 0x04)
4695 {
4696 /* leal foo(,%reg,1), %eax; call ___tls_get_addr
4697 Change it into:
4698 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4699 val >>= 3;
4700 roff = rel->r_offset - 3;
4701 }
4702 else
4703 {
4704 /* leal foo(%reg), %eax; call ___tls_get_addr; nop
4705 Change it into:
4706 movl %gs:0, %eax; subl $foo@gottpoff(%reg), %eax. */
4707 roff = rel->r_offset - 2;
4708 }
4709 memcpy (contents + roff,
4710 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
4711 contents[roff + 7] = 0x80 | (val & 7);
4712 /* If foo is used only with foo@gotntpoff(%reg) and
4713 foo@indntpoff, but not with foo@gottpoff(%reg), change
4714 subl $foo@gottpoff(%reg), %eax
4715 into:
4716 addl $foo@gotntpoff(%reg), %eax. */
4717 if (tls_type == GOT_TLS_IE_POS)
4718 contents[roff + 6] = 0x03;
4719 bfd_put_32 (output_bfd,
4720 htab->elf.sgot->output_section->vma
4721 + htab->elf.sgot->output_offset + off
4722 - htab->elf.sgotplt->output_section->vma
4723 - htab->elf.sgotplt->output_offset,
4724 contents + roff + 8);
4725 /* Skip R_386_PLT32. */
4726 rel++;
4727 wrel++;
4728 continue;
4729 }
4730 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_GOTDESC)
4731 {
4732 /* GDesc -> IE transition.
4733 It's originally something like:
4734 leal x@tlsdesc(%ebx), %eax
4735
4736 Change it to:
4737 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
4738 or:
4739 movl x@gottpoff(%ebx), %eax # before negl %eax
4740
4741 Registers other than %eax may be set up here. */
4742
4743 bfd_vma roff;
4744
4745 /* First, make sure it's a leal adding ebx to a 32-bit
4746 offset into any register, although it's probably
4747 almost always going to be eax. */
4748 roff = rel->r_offset;
4749
4750 /* Now modify the instruction as appropriate. */
4751 /* To turn a leal into a movl in the form we use it, it
4752 suffices to change the first byte from 0x8d to 0x8b.
4753 aoliva FIXME: should we decide to keep the leal, all
4754 we have to do is remove the statement below, and
4755 adjust the relaxation of R_386_TLS_DESC_CALL. */
4756 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
4757
4758 if (tls_type == GOT_TLS_IE_BOTH)
4759 off += 4;
4760
4761 bfd_put_32 (output_bfd,
4762 htab->elf.sgot->output_section->vma
4763 + htab->elf.sgot->output_offset + off
4764 - htab->elf.sgotplt->output_section->vma
4765 - htab->elf.sgotplt->output_offset,
4766 contents + roff);
4767 continue;
4768 }
4769 else if (ELF32_R_TYPE (rel->r_info) == R_386_TLS_DESC_CALL)
4770 {
4771 /* GDesc -> IE transition.
4772 It's originally:
4773 call *(%eax)
4774
4775 Change it to:
4776 xchg %ax,%ax
4777 or
4778 negl %eax
4779 depending on how we transformed the TLS_GOTDESC above.
4780 */
4781
4782 bfd_vma roff;
4783
4784 roff = rel->r_offset;
4785
4786 /* Now modify the instruction as appropriate. */
4787 if (tls_type != GOT_TLS_IE_NEG)
4788 {
4789 /* xchg %ax,%ax */
4790 bfd_put_8 (output_bfd, 0x66, contents + roff);
4791 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
4792 }
4793 else
4794 {
4795 /* negl %eax */
4796 bfd_put_8 (output_bfd, 0xf7, contents + roff);
4797 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
4798 }
4799
4800 continue;
4801 }
4802 else
4803 BFD_ASSERT (FALSE);
4804 break;
4805
4806 case R_386_TLS_LDM:
4807 if (! elf_i386_tls_transition (info, input_bfd,
4808 input_section, contents,
4809 symtab_hdr, sym_hashes,
4810 &r_type, GOT_UNKNOWN, rel,
4811 relend, h, r_symndx))
4812 return FALSE;
4813
4814 if (r_type != R_386_TLS_LDM)
4815 {
4816 /* LD->LE transition:
4817 leal foo(%reg), %eax; call ___tls_get_addr.
4818 We change it into:
4819 movl %gs:0, %eax; nop; leal 0(%esi,1), %esi. */
4820 BFD_ASSERT (r_type == R_386_TLS_LE_32);
4821 memcpy (contents + rel->r_offset - 2,
4822 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
4823 /* Skip R_386_PC32/R_386_PLT32. */
4824 rel++;
4825 wrel++;
4826 continue;
4827 }
4828
4829 if (htab->elf.sgot == NULL)
4830 abort ();
4831
4832 off = htab->tls_ldm_got.offset;
4833 if (off & 1)
4834 off &= ~1;
4835 else
4836 {
4837 Elf_Internal_Rela outrel;
4838
4839 if (htab->elf.srelgot == NULL)
4840 abort ();
4841
4842 outrel.r_offset = (htab->elf.sgot->output_section->vma
4843 + htab->elf.sgot->output_offset + off);
4844
4845 bfd_put_32 (output_bfd, 0,
4846 htab->elf.sgot->contents + off);
4847 bfd_put_32 (output_bfd, 0,
4848 htab->elf.sgot->contents + off + 4);
4849 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
4850 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
4851 htab->tls_ldm_got.offset |= 1;
4852 }
4853 relocation = htab->elf.sgot->output_section->vma
4854 + htab->elf.sgot->output_offset + off
4855 - htab->elf.sgotplt->output_section->vma
4856 - htab->elf.sgotplt->output_offset;
4857 unresolved_reloc = FALSE;
4858 break;
4859
4860 case R_386_TLS_LDO_32:
4861 if (!bfd_link_executable (info)
4862 || (input_section->flags & SEC_CODE) == 0)
4863 relocation -= elf_i386_dtpoff_base (info);
4864 else
4865 /* When converting LDO to LE, we must negate. */
4866 relocation = -elf_i386_tpoff (info, relocation);
4867 break;
4868
4869 case R_386_TLS_LE_32:
4870 case R_386_TLS_LE:
4871 if (!bfd_link_executable (info))
4872 {
4873 Elf_Internal_Rela outrel;
4874 asection *sreloc;
4875
4876 outrel.r_offset = rel->r_offset
4877 + input_section->output_section->vma
4878 + input_section->output_offset;
4879 if (h != NULL && h->dynindx != -1)
4880 indx = h->dynindx;
4881 else
4882 indx = 0;
4883 if (r_type == R_386_TLS_LE_32)
4884 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
4885 else
4886 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
4887 sreloc = elf_section_data (input_section)->sreloc;
4888 if (sreloc == NULL)
4889 abort ();
4890 elf_append_rel (output_bfd, sreloc, &outrel);
4891 if (indx)
4892 continue;
4893 else if (r_type == R_386_TLS_LE_32)
4894 relocation = elf_i386_dtpoff_base (info) - relocation;
4895 else
4896 relocation -= elf_i386_dtpoff_base (info);
4897 }
4898 else if (r_type == R_386_TLS_LE_32)
4899 relocation = elf_i386_tpoff (info, relocation);
4900 else
4901 relocation = -elf_i386_tpoff (info, relocation);
4902 break;
4903
4904 default:
4905 break;
4906 }
4907
4908 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4909 because such sections are not SEC_ALLOC and thus ld.so will
4910 not process them. */
4911 if (unresolved_reloc
4912 && !((input_section->flags & SEC_DEBUGGING) != 0
4913 && h->def_dynamic)
4914 && _bfd_elf_section_offset (output_bfd, info, input_section,
4915 rel->r_offset) != (bfd_vma) -1)
4916 {
4917 (*_bfd_error_handler)
4918 (_("%B(%A+0x%lx): unresolvable %s relocation against symbol `%s'"),
4919 input_bfd,
4920 input_section,
4921 (long) rel->r_offset,
4922 howto->name,
4923 h->root.root.string);
4924 return FALSE;
4925 }
4926
4927 do_relocation:
4928 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
4929 contents, rel->r_offset,
4930 relocation, 0);
4931
4932 check_relocation_error:
4933 if (r != bfd_reloc_ok)
4934 {
4935 const char *name;
4936
4937 if (h != NULL)
4938 name = h->root.root.string;
4939 else
4940 {
4941 name = bfd_elf_string_from_elf_section (input_bfd,
4942 symtab_hdr->sh_link,
4943 sym->st_name);
4944 if (name == NULL)
4945 return FALSE;
4946 if (*name == '\0')
4947 name = bfd_section_name (input_bfd, sec);
4948 }
4949
4950 if (r == bfd_reloc_overflow)
4951 {
4952 if (! ((*info->callbacks->reloc_overflow)
4953 (info, (h ? &h->root : NULL), name, howto->name,
4954 (bfd_vma) 0, input_bfd, input_section,
4955 rel->r_offset)))
4956 return FALSE;
4957 }
4958 else
4959 {
4960 (*_bfd_error_handler)
4961 (_("%B(%A+0x%lx): reloc against `%s': error %d"),
4962 input_bfd, input_section,
4963 (long) rel->r_offset, name, (int) r);
4964 return FALSE;
4965 }
4966 }
4967
4968 if (wrel != rel)
4969 *wrel = *rel;
4970 }
4971
4972 if (wrel != rel)
4973 {
4974 Elf_Internal_Shdr *rel_hdr;
4975 size_t deleted = rel - wrel;
4976
4977 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
4978 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4979 if (rel_hdr->sh_size == 0)
4980 {
4981 /* It is too late to remove an empty reloc section. Leave
4982 one NONE reloc.
4983 ??? What is wrong with an empty section??? */
4984 rel_hdr->sh_size = rel_hdr->sh_entsize;
4985 deleted -= 1;
4986 }
4987 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
4988 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
4989 input_section->reloc_count -= deleted;
4990 }
4991
4992 return TRUE;
4993 }
4994
4995 /* Finish up dynamic symbol handling. We set the contents of various
4996 dynamic sections here. */
4997
4998 static bfd_boolean
4999 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
5000 struct bfd_link_info *info,
5001 struct elf_link_hash_entry *h,
5002 Elf_Internal_Sym *sym)
5003 {
5004 struct elf_i386_link_hash_table *htab;
5005 unsigned plt_entry_size;
5006 const struct elf_i386_backend_data *abed;
5007 struct elf_i386_link_hash_entry *eh;
5008
5009 htab = elf_i386_hash_table (info);
5010 if (htab == NULL)
5011 return FALSE;
5012
5013 abed = get_elf_i386_backend_data (output_bfd);
5014 plt_entry_size = GET_PLT_ENTRY_SIZE (output_bfd);
5015
5016 eh = (struct elf_i386_link_hash_entry *) h;
5017
5018 if (h->plt.offset != (bfd_vma) -1)
5019 {
5020 bfd_vma plt_index;
5021 bfd_vma got_offset;
5022 Elf_Internal_Rela rel;
5023 bfd_byte *loc;
5024 asection *plt, *gotplt, *relplt;
5025
5026 /* When building a static executable, use .iplt, .igot.plt and
5027 .rel.iplt sections for STT_GNU_IFUNC symbols. */
5028 if (htab->elf.splt != NULL)
5029 {
5030 plt = htab->elf.splt;
5031 gotplt = htab->elf.sgotplt;
5032 relplt = htab->elf.srelplt;
5033 }
5034 else
5035 {
5036 plt = htab->elf.iplt;
5037 gotplt = htab->elf.igotplt;
5038 relplt = htab->elf.irelplt;
5039 }
5040
5041 /* This symbol has an entry in the procedure linkage table. Set
5042 it up. */
5043
5044 if ((h->dynindx == -1
5045 && !((h->forced_local || bfd_link_executable (info))
5046 && h->def_regular
5047 && h->type == STT_GNU_IFUNC))
5048 || plt == NULL
5049 || gotplt == NULL
5050 || relplt == NULL)
5051 abort ();
5052
5053 /* Get the index in the procedure linkage table which
5054 corresponds to this symbol. This is the index of this symbol
5055 in all the symbols for which we are making plt entries. The
5056 first entry in the procedure linkage table is reserved.
5057
5058 Get the offset into the .got table of the entry that
5059 corresponds to this function. Each .got entry is 4 bytes.
5060 The first three are reserved.
5061
5062 For static executables, we don't reserve anything. */
5063
5064 if (plt == htab->elf.splt)
5065 {
5066 got_offset = h->plt.offset / plt_entry_size - 1;
5067 got_offset = (got_offset + 3) * 4;
5068 }
5069 else
5070 {
5071 got_offset = h->plt.offset / plt_entry_size;
5072 got_offset = got_offset * 4;
5073 }
5074
5075 /* Fill in the entry in the procedure linkage table. */
5076 if (! bfd_link_pic (info))
5077 {
5078 memcpy (plt->contents + h->plt.offset, abed->plt->plt_entry,
5079 abed->plt->plt_entry_size);
5080 bfd_put_32 (output_bfd,
5081 (gotplt->output_section->vma
5082 + gotplt->output_offset
5083 + got_offset),
5084 plt->contents + h->plt.offset
5085 + abed->plt->plt_got_offset);
5086
5087 if (abed->is_vxworks)
5088 {
5089 int s, k, reloc_index;
5090
5091 /* Create the R_386_32 relocation referencing the GOT
5092 for this PLT entry. */
5093
5094 /* S: Current slot number (zero-based). */
5095 s = ((h->plt.offset - abed->plt->plt_entry_size)
5096 / abed->plt->plt_entry_size);
5097 /* K: Number of relocations for PLTResolve. */
5098 if (bfd_link_pic (info))
5099 k = PLTRESOLVE_RELOCS_SHLIB;
5100 else
5101 k = PLTRESOLVE_RELOCS;
5102 /* Skip the PLTresolve relocations, and the relocations for
5103 the other PLT slots. */
5104 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
5105 loc = (htab->srelplt2->contents + reloc_index
5106 * sizeof (Elf32_External_Rel));
5107
5108 rel.r_offset = (htab->elf.splt->output_section->vma
5109 + htab->elf.splt->output_offset
5110 + h->plt.offset + 2),
5111 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5112 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5113
5114 /* Create the R_386_32 relocation referencing the beginning of
5115 the PLT for this GOT entry. */
5116 rel.r_offset = (htab->elf.sgotplt->output_section->vma
5117 + htab->elf.sgotplt->output_offset
5118 + got_offset);
5119 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5120 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5121 loc + sizeof (Elf32_External_Rel));
5122 }
5123 }
5124 else
5125 {
5126 memcpy (plt->contents + h->plt.offset, abed->plt->pic_plt_entry,
5127 abed->plt->plt_entry_size);
5128 bfd_put_32 (output_bfd, got_offset,
5129 plt->contents + h->plt.offset
5130 + abed->plt->plt_got_offset);
5131 }
5132
5133 /* Fill in the entry in the global offset table. */
5134 bfd_put_32 (output_bfd,
5135 (plt->output_section->vma
5136 + plt->output_offset
5137 + h->plt.offset
5138 + abed->plt->plt_lazy_offset),
5139 gotplt->contents + got_offset);
5140
5141 /* Fill in the entry in the .rel.plt section. */
5142 rel.r_offset = (gotplt->output_section->vma
5143 + gotplt->output_offset
5144 + got_offset);
5145 if (h->dynindx == -1
5146 || ((bfd_link_executable (info)
5147 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
5148 && h->def_regular
5149 && h->type == STT_GNU_IFUNC))
5150 {
5151 /* If an STT_GNU_IFUNC symbol is locally defined, generate
5152 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
5153 in the .got.plt section. */
5154 bfd_put_32 (output_bfd,
5155 (h->root.u.def.value
5156 + h->root.u.def.section->output_section->vma
5157 + h->root.u.def.section->output_offset),
5158 gotplt->contents + got_offset);
5159 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
5160 /* R_386_IRELATIVE comes last. */
5161 plt_index = htab->next_irelative_index--;
5162 }
5163 else
5164 {
5165 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
5166 plt_index = htab->next_jump_slot_index++;
5167 }
5168 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
5169 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
5170
5171 /* Don't fill PLT entry for static executables. */
5172 if (plt == htab->elf.splt)
5173 {
5174 bfd_put_32 (output_bfd, plt_index * sizeof (Elf32_External_Rel),
5175 plt->contents + h->plt.offset
5176 + abed->plt->plt_reloc_offset);
5177 bfd_put_32 (output_bfd, - (h->plt.offset
5178 + abed->plt->plt_plt_offset + 4),
5179 plt->contents + h->plt.offset
5180 + abed->plt->plt_plt_offset);
5181 }
5182 }
5183 else if (eh->plt_got.offset != (bfd_vma) -1)
5184 {
5185 bfd_vma got_offset, plt_offset;
5186 asection *plt, *got, *gotplt;
5187 const bfd_byte *got_plt_entry;
5188
5189 /* Offset of displacement of the indirect jump. */
5190 bfd_vma plt_got_offset = 2;
5191
5192 /* Set the entry in the GOT procedure linkage table. */
5193 plt = htab->plt_got;
5194 got = htab->elf.sgot;
5195 gotplt = htab->elf.sgotplt;
5196 got_offset = h->got.offset;
5197
5198 if (got_offset == (bfd_vma) -1
5199 || plt == NULL
5200 || got == NULL
5201 || gotplt == NULL)
5202 abort ();
5203
5204 /* Fill in the entry in the GOT procedure linkage table. */
5205 if (! bfd_link_pic (info))
5206 {
5207 got_plt_entry = elf_i386_got_plt_entry;
5208 got_offset += got->output_section->vma + got->output_offset;
5209 }
5210 else
5211 {
5212 got_plt_entry = elf_i386_pic_got_plt_entry;
5213 got_offset += (got->output_section->vma
5214 + got->output_offset
5215 - gotplt->output_section->vma
5216 - gotplt->output_offset);
5217 }
5218
5219 plt_offset = eh->plt_got.offset;
5220 memcpy (plt->contents + plt_offset, got_plt_entry,
5221 sizeof (elf_i386_got_plt_entry));
5222 bfd_put_32 (output_bfd, got_offset,
5223 plt->contents + plt_offset + plt_got_offset);
5224 }
5225
5226 if (!h->def_regular
5227 && (h->plt.offset != (bfd_vma) -1
5228 || eh->plt_got.offset != (bfd_vma) -1))
5229 {
5230 /* Mark the symbol as undefined, rather than as defined in
5231 the .plt section. Leave the value if there were any
5232 relocations where pointer equality matters (this is a clue
5233 for the dynamic linker, to make function pointer
5234 comparisons work between an application and shared
5235 library), otherwise set it to zero. If a function is only
5236 called from a binary, there is no need to slow down
5237 shared libraries because of that. */
5238 sym->st_shndx = SHN_UNDEF;
5239 if (!h->pointer_equality_needed)
5240 sym->st_value = 0;
5241 }
5242
5243 if (h->got.offset != (bfd_vma) -1
5244 && ! GOT_TLS_GD_ANY_P (elf_i386_hash_entry(h)->tls_type)
5245 && (elf_i386_hash_entry(h)->tls_type & GOT_TLS_IE) == 0)
5246 {
5247 Elf_Internal_Rela rel;
5248
5249 /* This symbol has an entry in the global offset table. Set it
5250 up. */
5251
5252 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
5253 abort ();
5254
5255 rel.r_offset = (htab->elf.sgot->output_section->vma
5256 + htab->elf.sgot->output_offset
5257 + (h->got.offset & ~(bfd_vma) 1));
5258
5259 /* If this is a static link, or it is a -Bsymbolic link and the
5260 symbol is defined locally or was forced to be local because
5261 of a version file, we just want to emit a RELATIVE reloc.
5262 The entry in the global offset table will already have been
5263 initialized in the relocate_section function. */
5264 if (h->def_regular
5265 && h->type == STT_GNU_IFUNC)
5266 {
5267 if (bfd_link_pic (info))
5268 {
5269 /* Generate R_386_GLOB_DAT. */
5270 goto do_glob_dat;
5271 }
5272 else
5273 {
5274 asection *plt;
5275
5276 if (!h->pointer_equality_needed)
5277 abort ();
5278
5279 /* For non-shared object, we can't use .got.plt, which
5280 contains the real function addres if we need pointer
5281 equality. We load the GOT entry with the PLT entry. */
5282 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
5283 bfd_put_32 (output_bfd,
5284 (plt->output_section->vma
5285 + plt->output_offset + h->plt.offset),
5286 htab->elf.sgot->contents + h->got.offset);
5287 return TRUE;
5288 }
5289 }
5290 else if (bfd_link_pic (info)
5291 && SYMBOL_REFERENCES_LOCAL (info, h))
5292 {
5293 BFD_ASSERT((h->got.offset & 1) != 0);
5294 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
5295 }
5296 else
5297 {
5298 BFD_ASSERT((h->got.offset & 1) == 0);
5299 do_glob_dat:
5300 bfd_put_32 (output_bfd, (bfd_vma) 0,
5301 htab->elf.sgot->contents + h->got.offset);
5302 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
5303 }
5304
5305 elf_append_rel (output_bfd, htab->elf.srelgot, &rel);
5306 }
5307
5308 if (h->needs_copy)
5309 {
5310 Elf_Internal_Rela rel;
5311
5312 /* This symbol needs a copy reloc. Set it up. */
5313
5314 if (h->dynindx == -1
5315 || (h->root.type != bfd_link_hash_defined
5316 && h->root.type != bfd_link_hash_defweak)
5317 || htab->srelbss == NULL)
5318 abort ();
5319
5320 rel.r_offset = (h->root.u.def.value
5321 + h->root.u.def.section->output_section->vma
5322 + h->root.u.def.section->output_offset);
5323 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
5324 elf_append_rel (output_bfd, htab->srelbss, &rel);
5325 }
5326
5327 return TRUE;
5328 }
5329
5330 /* Finish up local dynamic symbol handling. We set the contents of
5331 various dynamic sections here. */
5332
5333 static bfd_boolean
5334 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
5335 {
5336 struct elf_link_hash_entry *h
5337 = (struct elf_link_hash_entry *) *slot;
5338 struct bfd_link_info *info
5339 = (struct bfd_link_info *) inf;
5340
5341 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
5342 h, NULL);
5343 }
5344
5345 /* Used to decide how to sort relocs in an optimal manner for the
5346 dynamic linker, before writing them out. */
5347
5348 static enum elf_reloc_type_class
5349 elf_i386_reloc_type_class (const struct bfd_link_info *info,
5350 const asection *rel_sec ATTRIBUTE_UNUSED,
5351 const Elf_Internal_Rela *rela)
5352 {
5353 bfd *abfd = info->output_bfd;
5354 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
5355 struct elf_link_hash_table *htab = elf_hash_table (info);
5356 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
5357 Elf_Internal_Sym sym;
5358
5359 if (htab->dynsym == NULL
5360 || !bed->s->swap_symbol_in (abfd,
5361 (htab->dynsym->contents
5362 + r_symndx * sizeof (Elf32_External_Sym)),
5363 0, &sym))
5364 abort ();
5365
5366 /* Check relocation against STT_GNU_IFUNC symbol. */
5367 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
5368 return reloc_class_ifunc;
5369
5370 switch (ELF32_R_TYPE (rela->r_info))
5371 {
5372 case R_386_RELATIVE:
5373 return reloc_class_relative;
5374 case R_386_JUMP_SLOT:
5375 return reloc_class_plt;
5376 case R_386_COPY:
5377 return reloc_class_copy;
5378 default:
5379 return reloc_class_normal;
5380 }
5381 }
5382
5383 /* Finish up the dynamic sections. */
5384
5385 static bfd_boolean
5386 elf_i386_finish_dynamic_sections (bfd *output_bfd,
5387 struct bfd_link_info *info)
5388 {
5389 struct elf_i386_link_hash_table *htab;
5390 bfd *dynobj;
5391 asection *sdyn;
5392 const struct elf_i386_backend_data *abed;
5393
5394 htab = elf_i386_hash_table (info);
5395 if (htab == NULL)
5396 return FALSE;
5397
5398 dynobj = htab->elf.dynobj;
5399 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
5400 abed = get_elf_i386_backend_data (output_bfd);
5401
5402 if (htab->elf.dynamic_sections_created)
5403 {
5404 Elf32_External_Dyn *dyncon, *dynconend;
5405
5406 if (sdyn == NULL || htab->elf.sgot == NULL)
5407 abort ();
5408
5409 dyncon = (Elf32_External_Dyn *) sdyn->contents;
5410 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
5411 for (; dyncon < dynconend; dyncon++)
5412 {
5413 Elf_Internal_Dyn dyn;
5414 asection *s;
5415
5416 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
5417
5418 switch (dyn.d_tag)
5419 {
5420 default:
5421 if (abed->is_vxworks
5422 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
5423 break;
5424 continue;
5425
5426 case DT_PLTGOT:
5427 s = htab->elf.sgotplt;
5428 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5429 break;
5430
5431 case DT_JMPREL:
5432 s = htab->elf.srelplt;
5433 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
5434 break;
5435
5436 case DT_PLTRELSZ:
5437 s = htab->elf.srelplt;
5438 dyn.d_un.d_val = s->size;
5439 break;
5440
5441 case DT_RELSZ:
5442 /* My reading of the SVR4 ABI indicates that the
5443 procedure linkage table relocs (DT_JMPREL) should be
5444 included in the overall relocs (DT_REL). This is
5445 what Solaris does. However, UnixWare can not handle
5446 that case. Therefore, we override the DT_RELSZ entry
5447 here to make it not include the JMPREL relocs. */
5448 s = htab->elf.srelplt;
5449 if (s == NULL)
5450 continue;
5451 dyn.d_un.d_val -= s->size;
5452 break;
5453
5454 case DT_REL:
5455 /* We may not be using the standard ELF linker script.
5456 If .rel.plt is the first .rel section, we adjust
5457 DT_REL to not include it. */
5458 s = htab->elf.srelplt;
5459 if (s == NULL)
5460 continue;
5461 if (dyn.d_un.d_ptr != s->output_section->vma + s->output_offset)
5462 continue;
5463 dyn.d_un.d_ptr += s->size;
5464 break;
5465 }
5466
5467 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
5468 }
5469
5470 /* Fill in the first entry in the procedure linkage table. */
5471 if (htab->elf.splt && htab->elf.splt->size > 0)
5472 {
5473 if (bfd_link_pic (info))
5474 {
5475 memcpy (htab->elf.splt->contents, abed->plt->pic_plt0_entry,
5476 abed->plt->plt0_entry_size);
5477 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5478 abed->plt0_pad_byte,
5479 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5480 }
5481 else
5482 {
5483 memcpy (htab->elf.splt->contents, abed->plt->plt0_entry,
5484 abed->plt->plt0_entry_size);
5485 memset (htab->elf.splt->contents + abed->plt->plt0_entry_size,
5486 abed->plt0_pad_byte,
5487 abed->plt->plt_entry_size - abed->plt->plt0_entry_size);
5488 bfd_put_32 (output_bfd,
5489 (htab->elf.sgotplt->output_section->vma
5490 + htab->elf.sgotplt->output_offset
5491 + 4),
5492 htab->elf.splt->contents
5493 + abed->plt->plt0_got1_offset);
5494 bfd_put_32 (output_bfd,
5495 (htab->elf.sgotplt->output_section->vma
5496 + htab->elf.sgotplt->output_offset
5497 + 8),
5498 htab->elf.splt->contents
5499 + abed->plt->plt0_got2_offset);
5500
5501 if (abed->is_vxworks)
5502 {
5503 Elf_Internal_Rela rel;
5504
5505 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 4.
5506 On IA32 we use REL relocations so the addend goes in
5507 the PLT directly. */
5508 rel.r_offset = (htab->elf.splt->output_section->vma
5509 + htab->elf.splt->output_offset
5510 + abed->plt->plt0_got1_offset);
5511 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5512 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5513 htab->srelplt2->contents);
5514 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_ + 8. */
5515 rel.r_offset = (htab->elf.splt->output_section->vma
5516 + htab->elf.splt->output_offset
5517 + abed->plt->plt0_got2_offset);
5518 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5519 bfd_elf32_swap_reloc_out (output_bfd, &rel,
5520 htab->srelplt2->contents +
5521 sizeof (Elf32_External_Rel));
5522 }
5523 }
5524
5525 /* UnixWare sets the entsize of .plt to 4, although that doesn't
5526 really seem like the right value. */
5527 elf_section_data (htab->elf.splt->output_section)
5528 ->this_hdr.sh_entsize = 4;
5529
5530 /* Correct the .rel.plt.unloaded relocations. */
5531 if (abed->is_vxworks && !bfd_link_pic (info))
5532 {
5533 int num_plts = (htab->elf.splt->size
5534 / abed->plt->plt_entry_size) - 1;
5535 unsigned char *p;
5536
5537 p = htab->srelplt2->contents;
5538 if (bfd_link_pic (info))
5539 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
5540 else
5541 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
5542
5543 for (; num_plts; num_plts--)
5544 {
5545 Elf_Internal_Rela rel;
5546 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5547 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
5548 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5549 p += sizeof (Elf32_External_Rel);
5550
5551 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
5552 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
5553 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
5554 p += sizeof (Elf32_External_Rel);
5555 }
5556 }
5557 }
5558 }
5559
5560 if (htab->elf.sgotplt)
5561 {
5562 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
5563 {
5564 (*_bfd_error_handler)
5565 (_("discarded output section: `%A'"), htab->elf.sgotplt);
5566 return FALSE;
5567 }
5568
5569 /* Fill in the first three entries in the global offset table. */
5570 if (htab->elf.sgotplt->size > 0)
5571 {
5572 bfd_put_32 (output_bfd,
5573 (sdyn == NULL ? 0
5574 : sdyn->output_section->vma + sdyn->output_offset),
5575 htab->elf.sgotplt->contents);
5576 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
5577 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
5578 }
5579
5580 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
5581 }
5582
5583 /* Adjust .eh_frame for .plt section. */
5584 if (htab->plt_eh_frame != NULL
5585 && htab->plt_eh_frame->contents != NULL)
5586 {
5587 if (htab->elf.splt != NULL
5588 && htab->elf.splt->size != 0
5589 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
5590 && htab->elf.splt->output_section != NULL
5591 && htab->plt_eh_frame->output_section != NULL)
5592 {
5593 bfd_vma plt_start = htab->elf.splt->output_section->vma;
5594 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
5595 + htab->plt_eh_frame->output_offset
5596 + PLT_FDE_START_OFFSET;
5597 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
5598 htab->plt_eh_frame->contents
5599 + PLT_FDE_START_OFFSET);
5600 }
5601 if (htab->plt_eh_frame->sec_info_type
5602 == SEC_INFO_TYPE_EH_FRAME)
5603 {
5604 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
5605 htab->plt_eh_frame,
5606 htab->plt_eh_frame->contents))
5607 return FALSE;
5608 }
5609 }
5610
5611 if (htab->elf.sgot && htab->elf.sgot->size > 0)
5612 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
5613
5614 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
5615 htab_traverse (htab->loc_hash_table,
5616 elf_i386_finish_local_dynamic_symbol,
5617 info);
5618
5619 return TRUE;
5620 }
5621
5622 /* Return an array of PLT entry symbol values. */
5623
5624 static bfd_vma *
5625 elf_i386_get_plt_sym_val (bfd *abfd, asymbol **dynsyms, asection *plt,
5626 asection *relplt)
5627 {
5628 bfd_boolean (*slurp_relocs) (bfd *, asection *, asymbol **, bfd_boolean);
5629 arelent *p;
5630 long count, i;
5631 bfd_vma *plt_sym_val;
5632 bfd_vma plt_offset;
5633 bfd_byte *plt_contents;
5634 const struct elf_i386_backend_data *bed
5635 = get_elf_i386_backend_data (abfd);
5636 Elf_Internal_Shdr *hdr;
5637
5638 /* Get the .plt section contents. */
5639 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
5640 if (plt_contents == NULL)
5641 return NULL;
5642 if (!bfd_get_section_contents (abfd, (asection *) plt,
5643 plt_contents, 0, plt->size))
5644 {
5645 bad_return:
5646 free (plt_contents);
5647 return NULL;
5648 }
5649
5650 slurp_relocs = get_elf_backend_data (abfd)->s->slurp_reloc_table;
5651 if (! (*slurp_relocs) (abfd, relplt, dynsyms, TRUE))
5652 goto bad_return;
5653
5654 hdr = &elf_section_data (relplt)->this_hdr;
5655 count = relplt->size / hdr->sh_entsize;
5656
5657 plt_sym_val = (bfd_vma *) bfd_malloc (sizeof (bfd_vma) * count);
5658 if (plt_sym_val == NULL)
5659 goto bad_return;
5660
5661 for (i = 0; i < count; i++)
5662 plt_sym_val[i] = -1;
5663
5664 plt_offset = bed->plt->plt_entry_size;
5665 p = relplt->relocation;
5666 for (i = 0; i < count; i++, p++)
5667 {
5668 long reloc_index;
5669
5670 /* Skip unknown relocation. PR 17512: file: bc9d6cf5. */
5671 if (p->howto == NULL)
5672 continue;
5673
5674 if (p->howto->type != R_386_JUMP_SLOT
5675 && p->howto->type != R_386_IRELATIVE)
5676 continue;
5677
5678 reloc_index = H_GET_32 (abfd, (plt_contents + plt_offset
5679 + bed->plt->plt_reloc_offset));
5680 reloc_index /= sizeof (Elf32_External_Rel);
5681 if (reloc_index >= count)
5682 abort ();
5683 plt_sym_val[reloc_index] = plt->vma + plt_offset;
5684 plt_offset += bed->plt->plt_entry_size;
5685
5686 /* PR binutils/18437: Skip extra relocations in the .rel.plt
5687 section. */
5688 if (plt_offset >= plt->size)
5689 break;
5690 }
5691
5692 free (plt_contents);
5693
5694 return plt_sym_val;
5695 }
5696
5697 /* Similar to _bfd_elf_get_synthetic_symtab. */
5698
5699 static long
5700 elf_i386_get_synthetic_symtab (bfd *abfd,
5701 long symcount,
5702 asymbol **syms,
5703 long dynsymcount,
5704 asymbol **dynsyms,
5705 asymbol **ret)
5706 {
5707 asection *plt = bfd_get_section_by_name (abfd, ".plt");
5708 return _bfd_elf_ifunc_get_synthetic_symtab (abfd, symcount, syms,
5709 dynsymcount, dynsyms, ret,
5710 plt,
5711 elf_i386_get_plt_sym_val);
5712 }
5713
5714 /* Return TRUE if symbol should be hashed in the `.gnu.hash' section. */
5715
5716 static bfd_boolean
5717 elf_i386_hash_symbol (struct elf_link_hash_entry *h)
5718 {
5719 if (h->plt.offset != (bfd_vma) -1
5720 && !h->def_regular
5721 && !h->pointer_equality_needed)
5722 return FALSE;
5723
5724 return _bfd_elf_hash_symbol (h);
5725 }
5726
5727 /* Hook called by the linker routine which adds symbols from an object
5728 file. */
5729
5730 static bfd_boolean
5731 elf_i386_add_symbol_hook (bfd * abfd,
5732 struct bfd_link_info * info,
5733 Elf_Internal_Sym * sym,
5734 const char ** namep ATTRIBUTE_UNUSED,
5735 flagword * flagsp ATTRIBUTE_UNUSED,
5736 asection ** secp ATTRIBUTE_UNUSED,
5737 bfd_vma * valp ATTRIBUTE_UNUSED)
5738 {
5739 if (ELF_ST_BIND (sym->st_info) == STB_GNU_UNIQUE
5740 && (abfd->flags & DYNAMIC) == 0
5741 && bfd_get_flavour (info->output_bfd) == bfd_target_elf_flavour)
5742 elf_tdata (info->output_bfd)->has_gnu_symbols
5743 |= elf_gnu_symbol_unique;
5744
5745 return TRUE;
5746 }
5747
5748 #define TARGET_LITTLE_SYM i386_elf32_vec
5749 #define TARGET_LITTLE_NAME "elf32-i386"
5750 #define ELF_ARCH bfd_arch_i386
5751 #define ELF_TARGET_ID I386_ELF_DATA
5752 #define ELF_MACHINE_CODE EM_386
5753 #define ELF_MAXPAGESIZE 0x1000
5754
5755 #define elf_backend_can_gc_sections 1
5756 #define elf_backend_can_refcount 1
5757 #define elf_backend_want_got_plt 1
5758 #define elf_backend_plt_readonly 1
5759 #define elf_backend_want_plt_sym 0
5760 #define elf_backend_got_header_size 12
5761 #define elf_backend_plt_alignment 4
5762 #define elf_backend_extern_protected_data 1
5763
5764 /* Support RELA for objdump of prelink objects. */
5765 #define elf_info_to_howto elf_i386_info_to_howto_rel
5766 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
5767
5768 #define bfd_elf32_mkobject elf_i386_mkobject
5769
5770 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
5771 #define bfd_elf32_bfd_link_hash_table_create elf_i386_link_hash_table_create
5772 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
5773 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
5774 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
5775
5776 #define elf_backend_adjust_dynamic_symbol elf_i386_adjust_dynamic_symbol
5777 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
5778 #define elf_backend_check_relocs elf_i386_check_relocs
5779 #define elf_backend_copy_indirect_symbol elf_i386_copy_indirect_symbol
5780 #define elf_backend_create_dynamic_sections elf_i386_create_dynamic_sections
5781 #define elf_backend_fake_sections elf_i386_fake_sections
5782 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
5783 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
5784 #define elf_backend_gc_mark_hook elf_i386_gc_mark_hook
5785 #define elf_backend_gc_sweep_hook elf_i386_gc_sweep_hook
5786 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
5787 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
5788 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
5789 #define elf_backend_relocate_section elf_i386_relocate_section
5790 #define elf_backend_size_dynamic_sections elf_i386_size_dynamic_sections
5791 #define elf_backend_always_size_sections elf_i386_always_size_sections
5792 #define elf_backend_omit_section_dynsym \
5793 ((bfd_boolean (*) (bfd *, struct bfd_link_info *, asection *)) bfd_true)
5794 #define elf_backend_hash_symbol elf_i386_hash_symbol
5795 #define elf_backend_add_symbol_hook elf_i386_add_symbol_hook
5796
5797 #include "elf32-target.h"
5798
5799 /* FreeBSD support. */
5800
5801 #undef TARGET_LITTLE_SYM
5802 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
5803 #undef TARGET_LITTLE_NAME
5804 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
5805 #undef ELF_OSABI
5806 #define ELF_OSABI ELFOSABI_FREEBSD
5807
5808 /* The kernel recognizes executables as valid only if they carry a
5809 "FreeBSD" label in the ELF header. So we put this label on all
5810 executables and (for simplicity) also all other object files. */
5811
5812 static void
5813 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
5814 {
5815 _bfd_elf_post_process_headers (abfd, info);
5816
5817 #ifdef OLD_FREEBSD_ABI_LABEL
5818 {
5819 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
5820 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
5821 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
5822 }
5823 #endif
5824 }
5825
5826 #undef elf_backend_post_process_headers
5827 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
5828 #undef elf32_bed
5829 #define elf32_bed elf32_i386_fbsd_bed
5830
5831 #undef elf_backend_add_symbol_hook
5832
5833 #include "elf32-target.h"
5834
5835 /* Solaris 2. */
5836
5837 #undef TARGET_LITTLE_SYM
5838 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
5839 #undef TARGET_LITTLE_NAME
5840 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
5841
5842 #undef elf_backend_post_process_headers
5843
5844 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5845 objects won't be recognized. */
5846 #undef ELF_OSABI
5847
5848 #undef elf32_bed
5849 #define elf32_bed elf32_i386_sol2_bed
5850
5851 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
5852 boundary. */
5853 #undef elf_backend_static_tls_alignment
5854 #define elf_backend_static_tls_alignment 8
5855
5856 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5857
5858 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5859 File, p.63. */
5860 #undef elf_backend_want_plt_sym
5861 #define elf_backend_want_plt_sym 1
5862
5863 #include "elf32-target.h"
5864
5865 /* Intel MCU support. */
5866
5867 static bfd_boolean
5868 elf32_iamcu_elf_object_p (bfd *abfd)
5869 {
5870 /* Set the right machine number for an IAMCU elf32 file. */
5871 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
5872 return TRUE;
5873 }
5874
5875 #undef TARGET_LITTLE_SYM
5876 #define TARGET_LITTLE_SYM iamcu_elf32_vec
5877 #undef TARGET_LITTLE_NAME
5878 #define TARGET_LITTLE_NAME "elf32-iamcu"
5879 #undef ELF_ARCH
5880 #define ELF_ARCH bfd_arch_iamcu
5881
5882 #undef ELF_MACHINE_CODE
5883 #define ELF_MACHINE_CODE EM_IAMCU
5884
5885 #undef ELF_OSABI
5886
5887 #undef elf32_bed
5888 #define elf32_bed elf32_iamcu_bed
5889
5890 #undef elf_backend_object_p
5891 #define elf_backend_object_p elf32_iamcu_elf_object_p
5892
5893 #undef elf_backend_static_tls_alignment
5894
5895 #undef elf_backend_want_plt_sym
5896 #define elf_backend_want_plt_sym 0
5897
5898 #include "elf32-target.h"
5899
5900 /* Restore defaults. */
5901 #undef ELF_ARCH
5902 #define ELF_ARCH bfd_arch_i386
5903 #undef ELF_MACHINE_CODE
5904 #define ELF_MACHINE_CODE EM_386
5905
5906 /* Native Client support. */
5907
5908 #undef TARGET_LITTLE_SYM
5909 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
5910 #undef TARGET_LITTLE_NAME
5911 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
5912 #undef elf32_bed
5913 #define elf32_bed elf32_i386_nacl_bed
5914
5915 #undef ELF_MAXPAGESIZE
5916 #define ELF_MAXPAGESIZE 0x10000
5917
5918 /* Restore defaults. */
5919 #undef ELF_OSABI
5920 #undef elf_backend_want_plt_sym
5921 #define elf_backend_want_plt_sym 0
5922 #undef elf_backend_post_process_headers
5923 #undef elf_backend_static_tls_alignment
5924
5925 /* NaCl uses substantially different PLT entries for the same effects. */
5926
5927 #undef elf_backend_plt_alignment
5928 #define elf_backend_plt_alignment 5
5929 #define NACL_PLT_ENTRY_SIZE 64
5930 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
5931
5932 static const bfd_byte elf_i386_nacl_plt0_entry[] =
5933 {
5934 0xff, 0x35, /* pushl contents of address */
5935 0, 0, 0, 0, /* replaced with address of .got + 4. */
5936 0x8b, 0x0d, /* movl contents of address, %ecx */
5937 0, 0, 0, 0, /* replaced with address of .got + 8. */
5938 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5939 0xff, 0xe1 /* jmp *%ecx */
5940 };
5941
5942 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
5943 {
5944 0x8b, 0x0d, /* movl contents of address, %ecx */
5945 0, 0, 0, 0, /* replaced with GOT slot address. */
5946 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
5947 0xff, 0xe1, /* jmp *%ecx */
5948
5949 /* Pad to the next 32-byte boundary with nop instructions. */
5950 0x90,
5951 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5952 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5953
5954 /* Lazy GOT entries point here (32-byte aligned). */
5955 0x68, /* pushl immediate */
5956 0, 0, 0, 0, /* replaced with reloc offset. */
5957 0xe9, /* jmp relative */
5958 0, 0, 0, 0, /* replaced with offset to .plt. */
5959
5960 /* Pad to the next 32-byte boundary with nop instructions. */
5961 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5962 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5963 0x90, 0x90
5964 };
5965
5966 static const bfd_byte
5967 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
5968 {
5969 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
5970 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
5971 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
5972 0xff, 0xe1, /* jmp *%ecx */
5973
5974 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
5975 so pad to that size with nop instructions. */
5976 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
5977 };
5978
5979 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
5980 {
5981 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
5982 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
5983 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
5984 0xff, 0xe1, /* jmp *%ecx */
5985
5986 /* Pad to the next 32-byte boundary with nop instructions. */
5987 0x90,
5988 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5989 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5990
5991 /* Lazy GOT entries point here (32-byte aligned). */
5992 0x68, /* pushl immediate */
5993 0, 0, 0, 0, /* replaced with offset into relocation table. */
5994 0xe9, /* jmp relative */
5995 0, 0, 0, 0, /* replaced with offset to start of .plt. */
5996
5997 /* Pad to the next 32-byte boundary with nop instructions. */
5998 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
5999 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
6000 0x90, 0x90
6001 };
6002
6003 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
6004 {
6005 #if (PLT_CIE_LENGTH != 20 \
6006 || PLT_FDE_LENGTH != 36 \
6007 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
6008 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
6009 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
6010 #endif
6011 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
6012 0, 0, 0, 0, /* CIE ID */
6013 1, /* CIE version */
6014 'z', 'R', 0, /* Augmentation string */
6015 1, /* Code alignment factor */
6016 0x7c, /* Data alignment factor: -4 */
6017 8, /* Return address column */
6018 1, /* Augmentation size */
6019 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
6020 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
6021 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
6022 DW_CFA_nop, DW_CFA_nop,
6023
6024 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
6025 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
6026 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
6027 0, 0, 0, 0, /* .plt size goes here */
6028 0, /* Augmentation size */
6029 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
6030 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
6031 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
6032 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
6033 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
6034 13, /* Block length */
6035 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
6036 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
6037 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
6038 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
6039 DW_CFA_nop, DW_CFA_nop
6040 };
6041
6042 static const struct elf_i386_plt_layout elf_i386_nacl_plt =
6043 {
6044 elf_i386_nacl_plt0_entry, /* plt0_entry */
6045 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
6046 2, /* plt0_got1_offset */
6047 8, /* plt0_got2_offset */
6048 elf_i386_nacl_plt_entry, /* plt_entry */
6049 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
6050 2, /* plt_got_offset */
6051 33, /* plt_reloc_offset */
6052 38, /* plt_plt_offset */
6053 32, /* plt_lazy_offset */
6054 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
6055 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
6056 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
6057 sizeof (elf_i386_nacl_eh_frame_plt),/* eh_frame_plt_size */
6058 };
6059
6060 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
6061 {
6062 &elf_i386_nacl_plt, /* plt */
6063 0x90, /* plt0_pad_byte: nop insn */
6064 0, /* is_vxworks */
6065 };
6066
6067 static bfd_boolean
6068 elf32_i386_nacl_elf_object_p (bfd *abfd)
6069 {
6070 /* Set the right machine number for a NaCl i386 ELF32 file. */
6071 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
6072 return TRUE;
6073 }
6074
6075 #undef elf_backend_arch_data
6076 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
6077
6078 #undef elf_backend_object_p
6079 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
6080 #undef elf_backend_modify_segment_map
6081 #define elf_backend_modify_segment_map nacl_modify_segment_map
6082 #undef elf_backend_modify_program_headers
6083 #define elf_backend_modify_program_headers nacl_modify_program_headers
6084 #undef elf_backend_final_write_processing
6085 #define elf_backend_final_write_processing nacl_final_write_processing
6086
6087 #include "elf32-target.h"
6088
6089 /* Restore defaults. */
6090 #undef elf_backend_object_p
6091 #undef elf_backend_modify_segment_map
6092 #undef elf_backend_modify_program_headers
6093 #undef elf_backend_final_write_processing
6094
6095 /* VxWorks support. */
6096
6097 #undef TARGET_LITTLE_SYM
6098 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
6099 #undef TARGET_LITTLE_NAME
6100 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
6101 #undef ELF_OSABI
6102 #undef elf_backend_plt_alignment
6103 #define elf_backend_plt_alignment 4
6104
6105 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
6106 {
6107 &elf_i386_plt, /* plt */
6108 0x90, /* plt0_pad_byte */
6109 1, /* is_vxworks */
6110 };
6111
6112 #undef elf_backend_arch_data
6113 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
6114
6115 #undef elf_backend_relocs_compatible
6116 #undef elf_backend_add_symbol_hook
6117 #define elf_backend_add_symbol_hook \
6118 elf_vxworks_add_symbol_hook
6119 #undef elf_backend_link_output_symbol_hook
6120 #define elf_backend_link_output_symbol_hook \
6121 elf_vxworks_link_output_symbol_hook
6122 #undef elf_backend_emit_relocs
6123 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
6124 #undef elf_backend_final_write_processing
6125 #define elf_backend_final_write_processing \
6126 elf_vxworks_final_write_processing
6127 #undef elf_backend_static_tls_alignment
6128
6129 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
6130 define it. */
6131 #undef elf_backend_want_plt_sym
6132 #define elf_backend_want_plt_sym 1
6133
6134 #undef elf32_bed
6135 #define elf32_bed elf32_i386_vxworks_bed
6136
6137 #include "elf32-target.h"
GDB Binutils - Deliverables
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