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[deliverable/binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2021 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 "elfxx-x86.h"
22 #include "elf-vxworks.h"
23 #include "dwarf2.h"
24 #include "opcode/i386.h"
25
26 /* 386 uses REL relocations instead of RELA. */
27 #define USE_REL 1
28
29 #include "elf/i386.h"
30
31 static reloc_howto_type elf_howto_table[]=
32 {
33 HOWTO(R_386_NONE, 0, 3, 0, false, 0, complain_overflow_dont,
34 bfd_elf_generic_reloc, "R_386_NONE",
35 true, 0x00000000, 0x00000000, false),
36 HOWTO(R_386_32, 0, 2, 32, false, 0, complain_overflow_dont,
37 bfd_elf_generic_reloc, "R_386_32",
38 true, 0xffffffff, 0xffffffff, false),
39 HOWTO(R_386_PC32, 0, 2, 32, true, 0, complain_overflow_dont,
40 bfd_elf_generic_reloc, "R_386_PC32",
41 true, 0xffffffff, 0xffffffff, true),
42 HOWTO(R_386_GOT32, 0, 2, 32, false, 0, complain_overflow_dont,
43 bfd_elf_generic_reloc, "R_386_GOT32",
44 true, 0xffffffff, 0xffffffff, false),
45 HOWTO(R_386_PLT32, 0, 2, 32, true, 0, complain_overflow_dont,
46 bfd_elf_generic_reloc, "R_386_PLT32",
47 true, 0xffffffff, 0xffffffff, true),
48 HOWTO(R_386_COPY, 0, 2, 32, false, 0, complain_overflow_dont,
49 bfd_elf_generic_reloc, "R_386_COPY",
50 true, 0xffffffff, 0xffffffff, false),
51 HOWTO(R_386_GLOB_DAT, 0, 2, 32, false, 0, complain_overflow_dont,
52 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
53 true, 0xffffffff, 0xffffffff, false),
54 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, false, 0, complain_overflow_dont,
55 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
56 true, 0xffffffff, 0xffffffff, false),
57 HOWTO(R_386_RELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
58 bfd_elf_generic_reloc, "R_386_RELATIVE",
59 true, 0xffffffff, 0xffffffff, false),
60 HOWTO(R_386_GOTOFF, 0, 2, 32, false, 0, complain_overflow_dont,
61 bfd_elf_generic_reloc, "R_386_GOTOFF",
62 true, 0xffffffff, 0xffffffff, false),
63 HOWTO(R_386_GOTPC, 0, 2, 32, true, 0, complain_overflow_dont,
64 bfd_elf_generic_reloc, "R_386_GOTPC",
65 true, 0xffffffff, 0xffffffff, true),
66
67 /* We have a gap in the reloc numbers here.
68 R_386_standard counts the number up to this point, and
69 R_386_ext_offset is the value to subtract from a reloc type of
70 R_386_16 thru R_386_PC8 to form an index into this table. */
71 #define R_386_standard (R_386_GOTPC + 1)
72 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
73
74 /* These relocs are a GNU extension. */
75 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, false, 0, complain_overflow_dont,
76 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
77 true, 0xffffffff, 0xffffffff, false),
78 HOWTO(R_386_TLS_IE, 0, 2, 32, false, 0, complain_overflow_dont,
79 bfd_elf_generic_reloc, "R_386_TLS_IE",
80 true, 0xffffffff, 0xffffffff, false),
81 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, false, 0, complain_overflow_dont,
82 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
83 true, 0xffffffff, 0xffffffff, false),
84 HOWTO(R_386_TLS_LE, 0, 2, 32, false, 0, complain_overflow_dont,
85 bfd_elf_generic_reloc, "R_386_TLS_LE",
86 true, 0xffffffff, 0xffffffff, false),
87 HOWTO(R_386_TLS_GD, 0, 2, 32, false, 0, complain_overflow_dont,
88 bfd_elf_generic_reloc, "R_386_TLS_GD",
89 true, 0xffffffff, 0xffffffff, false),
90 HOWTO(R_386_TLS_LDM, 0, 2, 32, false, 0, complain_overflow_dont,
91 bfd_elf_generic_reloc, "R_386_TLS_LDM",
92 true, 0xffffffff, 0xffffffff, false),
93 HOWTO(R_386_16, 0, 1, 16, false, 0, complain_overflow_bitfield,
94 bfd_elf_generic_reloc, "R_386_16",
95 true, 0xffff, 0xffff, false),
96 HOWTO(R_386_PC16, 0, 1, 16, true, 0, complain_overflow_bitfield,
97 bfd_elf_generic_reloc, "R_386_PC16",
98 true, 0xffff, 0xffff, true),
99 HOWTO(R_386_8, 0, 0, 8, false, 0, complain_overflow_bitfield,
100 bfd_elf_generic_reloc, "R_386_8",
101 true, 0xff, 0xff, false),
102 HOWTO(R_386_PC8, 0, 0, 8, true, 0, complain_overflow_signed,
103 bfd_elf_generic_reloc, "R_386_PC8",
104 true, 0xff, 0xff, true),
105
106 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
107 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
108 /* These are common with Solaris TLS implementation. */
109 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, false, 0, complain_overflow_dont,
110 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
111 true, 0xffffffff, 0xffffffff, false),
112 HOWTO(R_386_TLS_IE_32, 0, 2, 32, false, 0, complain_overflow_dont,
113 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
114 true, 0xffffffff, 0xffffffff, false),
115 HOWTO(R_386_TLS_LE_32, 0, 2, 32, false, 0, complain_overflow_dont,
116 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
117 true, 0xffffffff, 0xffffffff, false),
118 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, false, 0, complain_overflow_dont,
119 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
120 true, 0xffffffff, 0xffffffff, false),
121 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
122 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
123 true, 0xffffffff, 0xffffffff, false),
124 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, false, 0, complain_overflow_dont,
125 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
126 true, 0xffffffff, 0xffffffff, false),
127 HOWTO(R_386_SIZE32, 0, 2, 32, false, 0, complain_overflow_dont,
128 bfd_elf_generic_reloc, "R_386_SIZE32",
129 true, 0xffffffff, 0xffffffff, false),
130 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, false, 0, complain_overflow_dont,
131 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
132 true, 0xffffffff, 0xffffffff, false),
133 HOWTO(R_386_TLS_DESC_CALL, 0, 3, 0, false, 0, complain_overflow_dont,
134 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
135 false, 0, 0, false),
136 HOWTO(R_386_TLS_DESC, 0, 2, 32, false, 0, complain_overflow_dont,
137 bfd_elf_generic_reloc, "R_386_TLS_DESC",
138 true, 0xffffffff, 0xffffffff, false),
139 HOWTO(R_386_IRELATIVE, 0, 2, 32, false, 0, complain_overflow_dont,
140 bfd_elf_generic_reloc, "R_386_IRELATIVE",
141 true, 0xffffffff, 0xffffffff, false),
142 HOWTO(R_386_GOT32X, 0, 2, 32, false, 0, complain_overflow_dont,
143 bfd_elf_generic_reloc, "R_386_GOT32X",
144 true, 0xffffffff, 0xffffffff, false),
145
146 /* Another gap. */
147 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
148 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
149
150 /* GNU extension to record C++ vtable hierarchy. */
151 HOWTO (R_386_GNU_VTINHERIT, /* type */
152 0, /* rightshift */
153 2, /* size (0 = byte, 1 = short, 2 = long) */
154 0, /* bitsize */
155 false, /* pc_relative */
156 0, /* bitpos */
157 complain_overflow_dont, /* complain_on_overflow */
158 NULL, /* special_function */
159 "R_386_GNU_VTINHERIT", /* name */
160 false, /* partial_inplace */
161 0, /* src_mask */
162 0, /* dst_mask */
163 false), /* pcrel_offset */
164
165 /* GNU extension to record C++ vtable member usage. */
166 HOWTO (R_386_GNU_VTENTRY, /* type */
167 0, /* rightshift */
168 2, /* size (0 = byte, 1 = short, 2 = long) */
169 0, /* bitsize */
170 false, /* pc_relative */
171 0, /* bitpos */
172 complain_overflow_dont, /* complain_on_overflow */
173 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
174 "R_386_GNU_VTENTRY", /* name */
175 false, /* partial_inplace */
176 0, /* src_mask */
177 0, /* dst_mask */
178 false) /* pcrel_offset */
179
180 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
181
182 };
183
184 #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
185
186 #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32)
187
188 #ifdef DEBUG_GEN_RELOC
189 #define TRACE(str) \
190 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
191 #else
192 #define TRACE(str)
193 #endif
194
195 static reloc_howto_type *
196 elf_i386_reloc_type_lookup (bfd *abfd,
197 bfd_reloc_code_real_type code)
198 {
199 switch (code)
200 {
201 case BFD_RELOC_NONE:
202 TRACE ("BFD_RELOC_NONE");
203 return &elf_howto_table[R_386_NONE];
204
205 case BFD_RELOC_32:
206 TRACE ("BFD_RELOC_32");
207 return &elf_howto_table[R_386_32];
208
209 case BFD_RELOC_CTOR:
210 TRACE ("BFD_RELOC_CTOR");
211 return &elf_howto_table[R_386_32];
212
213 case BFD_RELOC_32_PCREL:
214 TRACE ("BFD_RELOC_PC32");
215 return &elf_howto_table[R_386_PC32];
216
217 case BFD_RELOC_386_GOT32:
218 TRACE ("BFD_RELOC_386_GOT32");
219 return &elf_howto_table[R_386_GOT32];
220
221 case BFD_RELOC_386_PLT32:
222 TRACE ("BFD_RELOC_386_PLT32");
223 return &elf_howto_table[R_386_PLT32];
224
225 case BFD_RELOC_386_COPY:
226 TRACE ("BFD_RELOC_386_COPY");
227 return &elf_howto_table[R_386_COPY];
228
229 case BFD_RELOC_386_GLOB_DAT:
230 TRACE ("BFD_RELOC_386_GLOB_DAT");
231 return &elf_howto_table[R_386_GLOB_DAT];
232
233 case BFD_RELOC_386_JUMP_SLOT:
234 TRACE ("BFD_RELOC_386_JUMP_SLOT");
235 return &elf_howto_table[R_386_JUMP_SLOT];
236
237 case BFD_RELOC_386_RELATIVE:
238 TRACE ("BFD_RELOC_386_RELATIVE");
239 return &elf_howto_table[R_386_RELATIVE];
240
241 case BFD_RELOC_386_GOTOFF:
242 TRACE ("BFD_RELOC_386_GOTOFF");
243 return &elf_howto_table[R_386_GOTOFF];
244
245 case BFD_RELOC_386_GOTPC:
246 TRACE ("BFD_RELOC_386_GOTPC");
247 return &elf_howto_table[R_386_GOTPC];
248
249 /* These relocs are a GNU extension. */
250 case BFD_RELOC_386_TLS_TPOFF:
251 TRACE ("BFD_RELOC_386_TLS_TPOFF");
252 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
253
254 case BFD_RELOC_386_TLS_IE:
255 TRACE ("BFD_RELOC_386_TLS_IE");
256 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
257
258 case BFD_RELOC_386_TLS_GOTIE:
259 TRACE ("BFD_RELOC_386_TLS_GOTIE");
260 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
261
262 case BFD_RELOC_386_TLS_LE:
263 TRACE ("BFD_RELOC_386_TLS_LE");
264 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
265
266 case BFD_RELOC_386_TLS_GD:
267 TRACE ("BFD_RELOC_386_TLS_GD");
268 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
269
270 case BFD_RELOC_386_TLS_LDM:
271 TRACE ("BFD_RELOC_386_TLS_LDM");
272 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
273
274 case BFD_RELOC_16:
275 TRACE ("BFD_RELOC_16");
276 return &elf_howto_table[R_386_16 - R_386_ext_offset];
277
278 case BFD_RELOC_16_PCREL:
279 TRACE ("BFD_RELOC_16_PCREL");
280 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
281
282 case BFD_RELOC_8:
283 TRACE ("BFD_RELOC_8");
284 return &elf_howto_table[R_386_8 - R_386_ext_offset];
285
286 case BFD_RELOC_8_PCREL:
287 TRACE ("BFD_RELOC_8_PCREL");
288 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
289
290 /* Common with Sun TLS implementation. */
291 case BFD_RELOC_386_TLS_LDO_32:
292 TRACE ("BFD_RELOC_386_TLS_LDO_32");
293 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
294
295 case BFD_RELOC_386_TLS_IE_32:
296 TRACE ("BFD_RELOC_386_TLS_IE_32");
297 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
298
299 case BFD_RELOC_386_TLS_LE_32:
300 TRACE ("BFD_RELOC_386_TLS_LE_32");
301 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
302
303 case BFD_RELOC_386_TLS_DTPMOD32:
304 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
305 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
306
307 case BFD_RELOC_386_TLS_DTPOFF32:
308 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
309 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
310
311 case BFD_RELOC_386_TLS_TPOFF32:
312 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
313 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
314
315 case BFD_RELOC_SIZE32:
316 TRACE ("BFD_RELOC_SIZE32");
317 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
318
319 case BFD_RELOC_386_TLS_GOTDESC:
320 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
321 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
322
323 case BFD_RELOC_386_TLS_DESC_CALL:
324 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
325 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
326
327 case BFD_RELOC_386_TLS_DESC:
328 TRACE ("BFD_RELOC_386_TLS_DESC");
329 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
330
331 case BFD_RELOC_386_IRELATIVE:
332 TRACE ("BFD_RELOC_386_IRELATIVE");
333 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
334
335 case BFD_RELOC_386_GOT32X:
336 TRACE ("BFD_RELOC_386_GOT32X");
337 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
338
339 case BFD_RELOC_VTABLE_INHERIT:
340 TRACE ("BFD_RELOC_VTABLE_INHERIT");
341 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
342
343 case BFD_RELOC_VTABLE_ENTRY:
344 TRACE ("BFD_RELOC_VTABLE_ENTRY");
345 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
346
347 default:
348 TRACE ("Unknown");
349 /* xgettext:c-format */
350 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
351 abfd, (int) code);
352 bfd_set_error (bfd_error_bad_value);
353 return NULL;
354 }
355 }
356
357 static reloc_howto_type *
358 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
359 const char *r_name)
360 {
361 unsigned int i;
362
363 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
364 if (elf_howto_table[i].name != NULL
365 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
366 return &elf_howto_table[i];
367
368 return NULL;
369 }
370
371 static reloc_howto_type *
372 elf_i386_rtype_to_howto (unsigned r_type)
373 {
374 unsigned int indx;
375
376 if ((indx = r_type) >= R_386_standard
377 && ((indx = r_type - R_386_ext_offset) - R_386_standard
378 >= R_386_ext - R_386_standard)
379 && ((indx = r_type - R_386_tls_offset) - R_386_ext
380 >= R_386_ext2 - R_386_ext)
381 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
382 >= R_386_vt - R_386_ext2))
383 return NULL;
384 /* PR 17512: file: 0f67f69d. */
385 if (elf_howto_table [indx].type != r_type)
386 return NULL;
387 return &elf_howto_table[indx];
388 }
389
390 static bool
391 elf_i386_info_to_howto_rel (bfd *abfd,
392 arelent *cache_ptr,
393 Elf_Internal_Rela *dst)
394 {
395 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
396
397 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
398 {
399 /* xgettext:c-format */
400 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
401 abfd, r_type);
402 bfd_set_error (bfd_error_bad_value);
403 return false;
404 }
405
406 return true;
407 }
408
409 /* Return whether a symbol name implies a local label. The UnixWare
410 2.1 cc generates temporary symbols that start with .X, so we
411 recognize them here. FIXME: do other SVR4 compilers also use .X?.
412 If so, we should move the .X recognition into
413 _bfd_elf_is_local_label_name. */
414
415 static bool
416 elf_i386_is_local_label_name (bfd *abfd, const char *name)
417 {
418 if (name[0] == '.' && name[1] == 'X')
419 return true;
420
421 return _bfd_elf_is_local_label_name (abfd, name);
422 }
423 \f
424 /* Support for core dump NOTE sections. */
425
426 static bool
427 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
428 {
429 int offset;
430 size_t size;
431
432 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
433 {
434 int pr_version = bfd_get_32 (abfd, note->descdata);
435
436 if (pr_version != 1)
437 return false;
438
439 /* pr_cursig */
440 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
441
442 /* pr_pid */
443 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
444
445 /* pr_reg */
446 offset = 28;
447 size = bfd_get_32 (abfd, note->descdata + 8);
448 }
449 else
450 {
451 switch (note->descsz)
452 {
453 default:
454 return false;
455
456 case 144: /* Linux/i386 */
457 /* pr_cursig */
458 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
459
460 /* pr_pid */
461 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
462
463 /* pr_reg */
464 offset = 72;
465 size = 68;
466
467 break;
468 }
469 }
470
471 /* Make a ".reg/999" section. */
472 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
473 size, note->descpos + offset);
474 }
475
476 static bool
477 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
478 {
479 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
480 {
481 int pr_version = bfd_get_32 (abfd, note->descdata);
482
483 if (pr_version != 1)
484 return false;
485
486 elf_tdata (abfd)->core->program
487 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
488 elf_tdata (abfd)->core->command
489 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
490 }
491 else
492 {
493 switch (note->descsz)
494 {
495 default:
496 return false;
497
498 case 124: /* Linux/i386 elf_prpsinfo. */
499 elf_tdata (abfd)->core->pid
500 = bfd_get_32 (abfd, note->descdata + 12);
501 elf_tdata (abfd)->core->program
502 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
503 elf_tdata (abfd)->core->command
504 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
505 }
506 }
507
508 /* Note that for some reason, a spurious space is tacked
509 onto the end of the args in some (at least one anyway)
510 implementations, so strip it off if it exists. */
511 {
512 char *command = elf_tdata (abfd)->core->command;
513 int n = strlen (command);
514
515 if (0 < n && command[n - 1] == ' ')
516 command[n - 1] = '\0';
517 }
518
519 return true;
520 }
521 \f
522 /* Functions for the i386 ELF linker.
523
524 In order to gain some understanding of code in this file without
525 knowing all the intricate details of the linker, note the
526 following:
527
528 Functions named elf_i386_* are called by external routines, other
529 functions are only called locally. elf_i386_* functions appear
530 in this file more or less in the order in which they are called
531 from external routines. eg. elf_i386_check_relocs is called
532 early in the link process, elf_i386_finish_dynamic_sections is
533 one of the last functions. */
534
535 /* The size in bytes of an entry in the lazy procedure linkage table. */
536
537 #define LAZY_PLT_ENTRY_SIZE 16
538
539 /* The size in bytes of an entry in the non-lazy procedure linkage
540 table. */
541
542 #define NON_LAZY_PLT_ENTRY_SIZE 8
543
544 /* The first entry in an absolute lazy procedure linkage table looks
545 like this. See the SVR4 ABI i386 supplement to see how this works.
546 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
547
548 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
549 {
550 0xff, 0x35, /* pushl contents of address */
551 0, 0, 0, 0, /* replaced with address of .got + 4. */
552 0xff, 0x25, /* jmp indirect */
553 0, 0, 0, 0 /* replaced with address of .got + 8. */
554 };
555
556 /* Subsequent entries in an absolute lazy procedure linkage table look
557 like this. */
558
559 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
560 {
561 0xff, 0x25, /* jmp indirect */
562 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
563 0x68, /* pushl immediate */
564 0, 0, 0, 0, /* replaced with offset into relocation table. */
565 0xe9, /* jmp relative */
566 0, 0, 0, 0 /* replaced with offset to start of .plt. */
567 };
568
569 /* The first entry in a PIC lazy procedure linkage table look like
570 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
571 lazy_plt->plt0_pad_byte. */
572
573 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
574 {
575 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
576 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
577 };
578
579 /* Subsequent entries in a PIC lazy procedure linkage table look like
580 this. */
581
582 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
583 {
584 0xff, 0xa3, /* jmp *offset(%ebx) */
585 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
586 0x68, /* pushl immediate */
587 0, 0, 0, 0, /* replaced with offset into relocation table. */
588 0xe9, /* jmp relative */
589 0, 0, 0, 0 /* replaced with offset to start of .plt. */
590 };
591
592 /* Entries in the non-lazy procedure linkage table look like this. */
593
594 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
595 {
596 0xff, 0x25, /* jmp indirect */
597 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
598 0x66, 0x90 /* xchg %ax,%ax */
599 };
600
601 /* Entries in the PIC non-lazy procedure linkage table look like
602 this. */
603
604 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
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 /* The first entry in an absolute IBT-enabled lazy procedure linkage
612 table looks like this. */
613
614 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
615 {
616 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
617 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
618 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
619 };
620
621 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
622 table look like this. Subsequent entries for a PIC IBT-enabled lazy
623 procedure linkage table are the same. */
624
625 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
626 {
627 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
628 0x68, 0, 0, 0, 0, /* pushl immediate */
629 0xe9, 0, 0, 0, 0, /* jmp relative */
630 0x66, 0x90 /* xchg %ax,%ax */
631 };
632
633 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
634 look like. */
635
636 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
637 {
638 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
639 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
640 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
641 };
642
643 /* Entries for branches with IBT-enabled in the absolute non-lazey
644 procedure linkage table look like this. They have the same size
645 as the lazy PLT entry. */
646
647 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
648 {
649 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
650 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
651 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
652 };
653
654 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
655 linkage table look like this. They have the same size as the lazy
656 PLT entry. */
657
658 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
659 {
660 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
661 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
662 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
663 };
664
665 /* .eh_frame covering the lazy .plt section. */
666
667 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
668 {
669 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
670 0, 0, 0, 0, /* CIE ID */
671 1, /* CIE version */
672 'z', 'R', 0, /* Augmentation string */
673 1, /* Code alignment factor */
674 0x7c, /* Data alignment factor */
675 8, /* Return address column */
676 1, /* Augmentation size */
677 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
678 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
679 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
680 DW_CFA_nop, DW_CFA_nop,
681
682 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
683 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
684 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
685 0, 0, 0, 0, /* .plt size goes here */
686 0, /* Augmentation size */
687 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
688 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
689 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
690 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
691 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
692 11, /* Block length */
693 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
694 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
695 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
696 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
697 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
698 };
699
700 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
701
702 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
703 {
704 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
705 0, 0, 0, 0, /* CIE ID */
706 1, /* CIE version */
707 'z', 'R', 0, /* Augmentation string */
708 1, /* Code alignment factor */
709 0x7c, /* Data alignment factor */
710 8, /* Return address column */
711 1, /* Augmentation size */
712 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
713 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
714 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
715 DW_CFA_nop, DW_CFA_nop,
716
717 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
718 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
719 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
720 0, 0, 0, 0, /* .plt size goes here */
721 0, /* Augmentation size */
722 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
723 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
724 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
725 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
726 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
727 11, /* Block length */
728 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
729 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
730 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
731 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
732 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
733 };
734
735 /* .eh_frame covering the non-lazy .plt section. */
736
737 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
738 {
739 #define PLT_GOT_FDE_LENGTH 16
740 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
741 0, 0, 0, 0, /* CIE ID */
742 1, /* CIE version */
743 'z', 'R', 0, /* Augmentation string */
744 1, /* Code alignment factor */
745 0x7c, /* Data alignment factor */
746 8, /* Return address column */
747 1, /* Augmentation size */
748 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
749 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
750 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
751 DW_CFA_nop, DW_CFA_nop,
752
753 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
754 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
755 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
756 0, 0, 0, 0, /* non-lazy .plt size goes here */
757 0, /* Augmentation size */
758 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
759 };
760
761 /* These are the standard parameters. */
762 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
763 {
764 elf_i386_lazy_plt0_entry, /* plt0_entry */
765 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
766 elf_i386_lazy_plt_entry, /* plt_entry */
767 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
768 NULL, /* plt_tlsdesc_entry */
769 0, /* plt_tlsdesc_entry_size*/
770 0, /* plt_tlsdesc_got1_offset */
771 0, /* plt_tlsdesc_got2_offset */
772 0, /* plt_tlsdesc_got1_insn_end */
773 0, /* plt_tlsdesc_got2_insn_end */
774 2, /* plt0_got1_offset */
775 8, /* plt0_got2_offset */
776 0, /* plt0_got2_insn_end */
777 2, /* plt_got_offset */
778 7, /* plt_reloc_offset */
779 12, /* plt_plt_offset */
780 0, /* plt_got_insn_size */
781 0, /* plt_plt_insn_end */
782 6, /* plt_lazy_offset */
783 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
784 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
785 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
786 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
787 };
788
789 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
790 {
791 elf_i386_non_lazy_plt_entry, /* plt_entry */
792 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
793 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
794 2, /* plt_got_offset */
795 0, /* plt_got_insn_size */
796 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
797 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
798 };
799
800 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
801 {
802 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
803 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
804 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
805 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
806 NULL, /* plt_tlsdesc_entry */
807 0, /* plt_tlsdesc_entry_size*/
808 0, /* plt_tlsdesc_got1_offset */
809 0, /* plt_tlsdesc_got2_offset */
810 0, /* plt_tlsdesc_got1_insn_end */
811 0, /* plt_tlsdesc_got2_insn_end */
812 2, /* plt0_got1_offset */
813 8, /* plt0_got2_offset */
814 0, /* plt0_got2_insn_end */
815 4+2, /* plt_got_offset */
816 4+1, /* plt_reloc_offset */
817 4+6, /* plt_plt_offset */
818 0, /* plt_got_insn_size */
819 0, /* plt_plt_insn_end */
820 0, /* plt_lazy_offset */
821 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
822 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
823 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
824 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
825 };
826
827 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
828 {
829 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
830 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
831 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
832 4+2, /* plt_got_offset */
833 0, /* plt_got_insn_size */
834 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
835 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
836 };
837 \f
838
839 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
840 for the PLTResolve stub and then for each PLT entry. */
841 #define PLTRESOLVE_RELOCS_SHLIB 0
842 #define PLTRESOLVE_RELOCS 2
843 #define PLT_NON_JUMP_SLOT_RELOCS 2
844
845 /* Return TRUE if the TLS access code sequence support transition
846 from R_TYPE. */
847
848 static bool
849 elf_i386_check_tls_transition (asection *sec,
850 bfd_byte *contents,
851 Elf_Internal_Shdr *symtab_hdr,
852 struct elf_link_hash_entry **sym_hashes,
853 unsigned int r_type,
854 const Elf_Internal_Rela *rel,
855 const Elf_Internal_Rela *relend)
856 {
857 unsigned int val, type, reg;
858 unsigned long r_symndx;
859 struct elf_link_hash_entry *h;
860 bfd_vma offset;
861 bfd_byte *call;
862 bool indirect_call;
863
864 offset = rel->r_offset;
865 switch (r_type)
866 {
867 case R_386_TLS_GD:
868 case R_386_TLS_LDM:
869 if (offset < 2 || (rel + 1) >= relend)
870 return false;
871
872 indirect_call = false;
873 call = contents + offset + 4;
874 val = *(call - 5);
875 type = *(call - 6);
876 if (r_type == R_386_TLS_GD)
877 {
878 /* Check transition from GD access model. Only
879 leal foo@tlsgd(,%ebx,1), %eax
880 call ___tls_get_addr@PLT
881 or
882 leal foo@tlsgd(%ebx) %eax
883 call ___tls_get_addr@PLT
884 nop
885 or
886 leal foo@tlsgd(%reg), %eax
887 call *___tls_get_addr@GOT(%reg)
888 which may be converted to
889 addr32 call ___tls_get_addr
890 can transit to different access model. */
891 if ((offset + 10) > sec->size
892 || (type != 0x8d && type != 0x04))
893 return false;
894
895 if (type == 0x04)
896 {
897 /* leal foo@tlsgd(,%ebx,1), %eax
898 call ___tls_get_addr@PLT */
899 if (offset < 3)
900 return false;
901
902 if (*(call - 7) != 0x8d
903 || val != 0x1d
904 || call[0] != 0xe8)
905 return false;
906 }
907 else
908 {
909 /* This must be
910 leal foo@tlsgd(%ebx), %eax
911 call ___tls_get_addr@PLT
912 nop
913 or
914 leal foo@tlsgd(%reg), %eax
915 call *___tls_get_addr@GOT(%reg)
916 which may be converted to
917 addr32 call ___tls_get_addr
918
919 %eax can't be used as the GOT base register since it
920 is used to pass parameter to ___tls_get_addr. */
921 reg = val & 7;
922 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
923 return false;
924
925 indirect_call = call[0] == 0xff;
926 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
927 && !(call[0] == 0x67 && call[1] == 0xe8)
928 && !(indirect_call
929 && (call[1] & 0xf8) == 0x90
930 && (call[1] & 0x7) == reg))
931 return false;
932 }
933 }
934 else
935 {
936 /* Check transition from LD access model. Only
937 leal foo@tlsldm(%ebx), %eax
938 call ___tls_get_addr@PLT
939 or
940 leal foo@tlsldm(%reg), %eax
941 call *___tls_get_addr@GOT(%reg)
942 which may be converted to
943 addr32 call ___tls_get_addr
944 can transit to different access model. */
945 if (type != 0x8d || (offset + 9) > sec->size)
946 return false;
947
948 /* %eax can't be used as the GOT base register since it is
949 used to pass parameter to ___tls_get_addr. */
950 reg = val & 7;
951 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
952 return false;
953
954 indirect_call = call[0] == 0xff;
955 if (!(reg == 3 && call[0] == 0xe8)
956 && !(call[0] == 0x67 && call[1] == 0xe8)
957 && !(indirect_call
958 && (call[1] & 0xf8) == 0x90
959 && (call[1] & 0x7) == reg))
960 return false;
961 }
962
963 r_symndx = ELF32_R_SYM (rel[1].r_info);
964 if (r_symndx < symtab_hdr->sh_info)
965 return false;
966
967 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
968 if (h == NULL
969 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
970 return false;
971 else if (indirect_call)
972 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
973 else
974 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
975 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
976
977 case R_386_TLS_IE:
978 /* Check transition from IE access model:
979 movl foo@indntpoff(%rip), %eax
980 movl foo@indntpoff(%rip), %reg
981 addl foo@indntpoff(%rip), %reg
982 */
983
984 if (offset < 1 || (offset + 4) > sec->size)
985 return false;
986
987 /* Check "movl foo@tpoff(%rip), %eax" first. */
988 val = bfd_get_8 (abfd, contents + offset - 1);
989 if (val == 0xa1)
990 return true;
991
992 if (offset < 2)
993 return false;
994
995 /* Check movl|addl foo@tpoff(%rip), %reg. */
996 type = bfd_get_8 (abfd, contents + offset - 2);
997 return ((type == 0x8b || type == 0x03)
998 && (val & 0xc7) == 0x05);
999
1000 case R_386_TLS_GOTIE:
1001 case R_386_TLS_IE_32:
1002 /* Check transition from {IE_32,GOTIE} access model:
1003 subl foo@{tpoff,gontoff}(%reg1), %reg2
1004 movl foo@{tpoff,gontoff}(%reg1), %reg2
1005 addl foo@{tpoff,gontoff}(%reg1), %reg2
1006 */
1007
1008 if (offset < 2 || (offset + 4) > sec->size)
1009 return false;
1010
1011 val = bfd_get_8 (abfd, contents + offset - 1);
1012 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1013 return false;
1014
1015 type = bfd_get_8 (abfd, contents + offset - 2);
1016 return type == 0x8b || type == 0x2b || type == 0x03;
1017
1018 case R_386_TLS_GOTDESC:
1019 /* Check transition from GDesc access model:
1020 leal x@tlsdesc(%ebx), %eax
1021
1022 Make sure it's a leal adding ebx to a 32-bit offset
1023 into any register, although it's probably almost always
1024 going to be eax. */
1025
1026 if (offset < 2 || (offset + 4) > sec->size)
1027 return false;
1028
1029 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1030 return false;
1031
1032 val = bfd_get_8 (abfd, contents + offset - 1);
1033 return (val & 0xc7) == 0x83;
1034
1035 case R_386_TLS_DESC_CALL:
1036 /* Check transition from GDesc access model:
1037 call *x@tlsdesc(%eax)
1038 */
1039 if (offset + 2 <= sec->size)
1040 {
1041 /* Make sure that it's a call *x@tlsdesc(%eax). */
1042 call = contents + offset;
1043 return call[0] == 0xff && call[1] == 0x10;
1044 }
1045
1046 return false;
1047
1048 default:
1049 abort ();
1050 }
1051 }
1052
1053 /* Return TRUE if the TLS access transition is OK or no transition
1054 will be performed. Update R_TYPE if there is a transition. */
1055
1056 static bool
1057 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1058 asection *sec, bfd_byte *contents,
1059 Elf_Internal_Shdr *symtab_hdr,
1060 struct elf_link_hash_entry **sym_hashes,
1061 unsigned int *r_type, int tls_type,
1062 const Elf_Internal_Rela *rel,
1063 const Elf_Internal_Rela *relend,
1064 struct elf_link_hash_entry *h,
1065 unsigned long r_symndx,
1066 bool from_relocate_section)
1067 {
1068 unsigned int from_type = *r_type;
1069 unsigned int to_type = from_type;
1070 bool check = true;
1071
1072 /* Skip TLS transition for functions. */
1073 if (h != NULL
1074 && (h->type == STT_FUNC
1075 || h->type == STT_GNU_IFUNC))
1076 return true;
1077
1078 switch (from_type)
1079 {
1080 case R_386_TLS_GD:
1081 case R_386_TLS_GOTDESC:
1082 case R_386_TLS_DESC_CALL:
1083 case R_386_TLS_IE_32:
1084 case R_386_TLS_IE:
1085 case R_386_TLS_GOTIE:
1086 if (bfd_link_executable (info))
1087 {
1088 if (h == NULL)
1089 to_type = R_386_TLS_LE_32;
1090 else if (from_type != R_386_TLS_IE
1091 && from_type != R_386_TLS_GOTIE)
1092 to_type = R_386_TLS_IE_32;
1093 }
1094
1095 /* When we are called from elf_i386_relocate_section, there may
1096 be additional transitions based on TLS_TYPE. */
1097 if (from_relocate_section)
1098 {
1099 unsigned int new_to_type = to_type;
1100
1101 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1102 new_to_type = R_386_TLS_LE_32;
1103
1104 if (to_type == R_386_TLS_GD
1105 || to_type == R_386_TLS_GOTDESC
1106 || to_type == R_386_TLS_DESC_CALL)
1107 {
1108 if (tls_type == GOT_TLS_IE_POS)
1109 new_to_type = R_386_TLS_GOTIE;
1110 else if (tls_type & GOT_TLS_IE)
1111 new_to_type = R_386_TLS_IE_32;
1112 }
1113
1114 /* We checked the transition before when we were called from
1115 elf_i386_check_relocs. We only want to check the new
1116 transition which hasn't been checked before. */
1117 check = new_to_type != to_type && from_type == to_type;
1118 to_type = new_to_type;
1119 }
1120
1121 break;
1122
1123 case R_386_TLS_LDM:
1124 if (bfd_link_executable (info))
1125 to_type = R_386_TLS_LE_32;
1126 break;
1127
1128 default:
1129 return true;
1130 }
1131
1132 /* Return TRUE if there is no transition. */
1133 if (from_type == to_type)
1134 return true;
1135
1136 /* Check if the transition can be performed. */
1137 if (check
1138 && ! elf_i386_check_tls_transition (sec, contents,
1139 symtab_hdr, sym_hashes,
1140 from_type, rel, relend))
1141 {
1142 reloc_howto_type *from, *to;
1143 const char *name;
1144
1145 from = elf_i386_rtype_to_howto (from_type);
1146 to = elf_i386_rtype_to_howto (to_type);
1147
1148 if (h)
1149 name = h->root.root.string;
1150 else
1151 {
1152 struct elf_x86_link_hash_table *htab;
1153
1154 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1155 if (htab == NULL)
1156 name = "*unknown*";
1157 else
1158 {
1159 Elf_Internal_Sym *isym;
1160
1161 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1162 abfd, r_symndx);
1163 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1164 }
1165 }
1166
1167 _bfd_error_handler
1168 /* xgettext:c-format */
1169 (_("%pB: TLS transition from %s to %s against `%s'"
1170 " at %#" PRIx64 " in section `%pA' failed"),
1171 abfd, from->name, to->name, name,
1172 (uint64_t) rel->r_offset, sec);
1173 bfd_set_error (bfd_error_bad_value);
1174 return false;
1175 }
1176
1177 *r_type = to_type;
1178 return true;
1179 }
1180
1181 /* With the local symbol, foo, we convert
1182 mov foo@GOT[(%reg1)], %reg2
1183 to
1184 lea foo[@GOTOFF(%reg1)], %reg2
1185 and convert
1186 call/jmp *foo@GOT[(%reg)]
1187 to
1188 nop call foo/jmp foo nop
1189 When PIC is false, convert
1190 test %reg1, foo@GOT[(%reg2)]
1191 to
1192 test $foo, %reg1
1193 and convert
1194 binop foo@GOT[(%reg1)], %reg2
1195 to
1196 binop $foo, %reg2
1197 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1198 instructions. */
1199
1200 static
1201 bool
1202 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1203 bfd_byte *contents,
1204 unsigned int *r_type_p,
1205 Elf_Internal_Rela *irel,
1206 struct elf_link_hash_entry *h,
1207 bool *converted,
1208 struct bfd_link_info *link_info)
1209 {
1210 struct elf_x86_link_hash_table *htab;
1211 unsigned int opcode;
1212 unsigned int modrm;
1213 bool baseless;
1214 Elf_Internal_Sym *isym;
1215 unsigned int addend;
1216 unsigned int nop;
1217 bfd_vma nop_offset;
1218 bool is_pic;
1219 bool to_reloc_32;
1220 bool abs_symbol;
1221 unsigned int r_type;
1222 unsigned int r_symndx;
1223 bfd_vma roff = irel->r_offset;
1224 bool local_ref;
1225 struct elf_x86_link_hash_entry *eh;
1226
1227 if (roff < 2)
1228 return true;
1229
1230 /* Addend for R_386_GOT32X relocations must be 0. */
1231 addend = bfd_get_32 (abfd, contents + roff);
1232 if (addend != 0)
1233 return true;
1234
1235 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1236 is_pic = bfd_link_pic (link_info);
1237
1238 r_type = *r_type_p;
1239 r_symndx = ELF32_R_SYM (irel->r_info);
1240
1241 modrm = bfd_get_8 (abfd, contents + roff - 1);
1242 baseless = (modrm & 0xc7) == 0x5;
1243
1244 if (h)
1245 {
1246 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1247 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1248 isym = NULL;
1249 abs_symbol = ABS_SYMBOL_P (h);
1250 }
1251 else
1252 {
1253 local_ref = true;
1254 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd,
1255 r_symndx);
1256 abs_symbol = isym->st_shndx == SHN_ABS;
1257 }
1258
1259 if (baseless && is_pic)
1260 {
1261 /* For PIC, disallow R_386_GOT32X without a base register
1262 since we don't know what the GOT base is. */
1263 const char *name;
1264
1265 if (h == NULL)
1266 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1267 else
1268 name = h->root.root.string;
1269
1270 _bfd_error_handler
1271 /* xgettext:c-format */
1272 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1273 " register can not be used when making a shared object"),
1274 abfd, name);
1275 return false;
1276 }
1277
1278 opcode = bfd_get_8 (abfd, contents + roff - 2);
1279
1280 /* Convert to R_386_32 if PIC is false or there is no base
1281 register. */
1282 to_reloc_32 = !is_pic || baseless;
1283
1284 eh = elf_x86_hash_entry (h);
1285
1286 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1287 reloc. */
1288 if (h == NULL)
1289 {
1290 if (opcode == 0x0ff)
1291 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1292 goto convert_branch;
1293 else
1294 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1295 "test %reg1, foo@GOT(%reg2)" and
1296 "binop foo@GOT[(%reg1)], %reg2". */
1297 goto convert_load;
1298 }
1299
1300 /* Undefined weak symbol is only bound locally in executable
1301 and its reference is resolved as 0. */
1302 if (h->root.type == bfd_link_hash_undefweak
1303 && !eh->linker_def
1304 && local_ref)
1305 {
1306 if (opcode == 0xff)
1307 {
1308 /* No direct branch to 0 for PIC. */
1309 if (is_pic)
1310 return true;
1311 else
1312 goto convert_branch;
1313 }
1314 else
1315 {
1316 /* We can convert load of address 0 to R_386_32. */
1317 to_reloc_32 = true;
1318 goto convert_load;
1319 }
1320 }
1321
1322 if (opcode == 0xff)
1323 {
1324 /* We have "call/jmp *foo@GOT[(%reg)]". */
1325 if ((h->root.type == bfd_link_hash_defined
1326 || h->root.type == bfd_link_hash_defweak)
1327 && local_ref)
1328 {
1329 /* The function is locally defined. */
1330 convert_branch:
1331 /* Convert R_386_GOT32X to R_386_PC32. */
1332 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1333 {
1334 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1335 is a nop prefix. */
1336 modrm = 0xe8;
1337 /* To support TLS optimization, always use addr32 prefix
1338 for "call *___tls_get_addr@GOT(%reg)". */
1339 if (eh && eh->tls_get_addr)
1340 {
1341 nop = 0x67;
1342 nop_offset = irel->r_offset - 2;
1343 }
1344 else
1345 {
1346 nop = htab->params->call_nop_byte;
1347 if (htab->params->call_nop_as_suffix)
1348 {
1349 nop_offset = roff + 3;
1350 irel->r_offset -= 1;
1351 }
1352 else
1353 nop_offset = roff - 2;
1354 }
1355 }
1356 else
1357 {
1358 /* Convert to "jmp foo nop". */
1359 modrm = 0xe9;
1360 nop = NOP_OPCODE;
1361 nop_offset = roff + 3;
1362 irel->r_offset -= 1;
1363 }
1364
1365 bfd_put_8 (abfd, nop, contents + nop_offset);
1366 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1367 /* When converting to PC-relative relocation, we
1368 need to adjust addend by -4. */
1369 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1370 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1371 *r_type_p = R_386_PC32;
1372 *converted = true;
1373 }
1374 }
1375 else
1376 {
1377 /* We have "mov foo@GOT[(%re1g)], %reg2",
1378 "test %reg1, foo@GOT(%reg2)" and
1379 "binop foo@GOT[(%reg1)], %reg2".
1380
1381 Avoid optimizing _DYNAMIC since ld.so may use its
1382 link-time address. */
1383 if (h == htab->elf.hdynamic)
1384 return true;
1385
1386 /* def_regular is set by an assignment in a linker script in
1387 bfd_elf_record_link_assignment. start_stop is set on
1388 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1389 if (h->start_stop
1390 || eh->linker_def
1391 || ((h->def_regular
1392 || h->root.type == bfd_link_hash_defined
1393 || h->root.type == bfd_link_hash_defweak)
1394 && local_ref))
1395 {
1396 convert_load:
1397 if (opcode == 0x8b)
1398 {
1399 if (abs_symbol && local_ref)
1400 to_reloc_32 = true;
1401
1402 if (to_reloc_32)
1403 {
1404 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1405 "mov $foo, %reg2" with R_386_32. */
1406 r_type = R_386_32;
1407 modrm = 0xc0 | (modrm & 0x38) >> 3;
1408 bfd_put_8 (abfd, modrm, contents + roff - 1);
1409 opcode = 0xc7;
1410 }
1411 else
1412 {
1413 /* Convert "mov foo@GOT(%reg1), %reg2" to
1414 "lea foo@GOTOFF(%reg1), %reg2". */
1415 r_type = R_386_GOTOFF;
1416 opcode = 0x8d;
1417 }
1418 }
1419 else
1420 {
1421 /* Only R_386_32 is supported. */
1422 if (!to_reloc_32)
1423 return true;
1424
1425 if (opcode == 0x85)
1426 {
1427 /* Convert "test %reg1, foo@GOT(%reg2)" to
1428 "test $foo, %reg1". */
1429 modrm = 0xc0 | (modrm & 0x38) >> 3;
1430 opcode = 0xf7;
1431 }
1432 else
1433 {
1434 /* Convert "binop foo@GOT(%reg1), %reg2" to
1435 "binop $foo, %reg2". */
1436 modrm = (0xc0
1437 | (modrm & 0x38) >> 3
1438 | (opcode & 0x3c));
1439 opcode = 0x81;
1440 }
1441 bfd_put_8 (abfd, modrm, contents + roff - 1);
1442 r_type = R_386_32;
1443 }
1444
1445 bfd_put_8 (abfd, opcode, contents + roff - 2);
1446 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1447 *r_type_p = r_type;
1448 *converted = true;
1449 }
1450 }
1451
1452 return true;
1453 }
1454
1455 /* Rename some of the generic section flags to better document how they
1456 are used here. */
1457 #define check_relocs_failed sec_flg0
1458
1459 /* Look through the relocs for a section during the first phase, and
1460 calculate needed space in the global offset table, procedure linkage
1461 table, and dynamic reloc sections. */
1462
1463 static bool
1464 elf_i386_check_relocs (bfd *abfd,
1465 struct bfd_link_info *info,
1466 asection *sec,
1467 const Elf_Internal_Rela *relocs)
1468 {
1469 struct elf_x86_link_hash_table *htab;
1470 Elf_Internal_Shdr *symtab_hdr;
1471 struct elf_link_hash_entry **sym_hashes;
1472 const Elf_Internal_Rela *rel;
1473 const Elf_Internal_Rela *rel_end;
1474 asection *sreloc;
1475 bfd_byte *contents;
1476 bool converted;
1477
1478 if (bfd_link_relocatable (info))
1479 return true;
1480
1481 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1482 if (htab == NULL)
1483 {
1484 sec->check_relocs_failed = 1;
1485 return false;
1486 }
1487
1488 BFD_ASSERT (is_x86_elf (abfd, htab));
1489
1490 /* Get the section contents. */
1491 if (elf_section_data (sec)->this_hdr.contents != NULL)
1492 contents = elf_section_data (sec)->this_hdr.contents;
1493 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1494 {
1495 sec->check_relocs_failed = 1;
1496 return false;
1497 }
1498
1499 symtab_hdr = &elf_symtab_hdr (abfd);
1500 sym_hashes = elf_sym_hashes (abfd);
1501
1502 converted = false;
1503
1504 sreloc = NULL;
1505
1506 rel_end = relocs + sec->reloc_count;
1507 for (rel = relocs; rel < rel_end; rel++)
1508 {
1509 unsigned int r_type;
1510 unsigned int r_symndx;
1511 struct elf_link_hash_entry *h;
1512 struct elf_x86_link_hash_entry *eh;
1513 Elf_Internal_Sym *isym;
1514 const char *name;
1515 bool size_reloc;
1516 bool no_dynreloc;
1517
1518 r_symndx = ELF32_R_SYM (rel->r_info);
1519 r_type = ELF32_R_TYPE (rel->r_info);
1520
1521 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1522 {
1523 /* xgettext:c-format */
1524 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1525 abfd, r_symndx);
1526 goto error_return;
1527 }
1528
1529 if (r_symndx < symtab_hdr->sh_info)
1530 {
1531 /* A local symbol. */
1532 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1533 abfd, r_symndx);
1534 if (isym == NULL)
1535 goto error_return;
1536
1537 /* Check relocation against local STT_GNU_IFUNC symbol. */
1538 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1539 {
1540 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
1541 if (h == NULL)
1542 goto error_return;
1543
1544 /* Fake a STT_GNU_IFUNC symbol. */
1545 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1546 isym, NULL);
1547 h->type = STT_GNU_IFUNC;
1548 h->def_regular = 1;
1549 h->ref_regular = 1;
1550 h->forced_local = 1;
1551 h->root.type = bfd_link_hash_defined;
1552 }
1553 else
1554 h = NULL;
1555 }
1556 else
1557 {
1558 isym = NULL;
1559 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1560 while (h->root.type == bfd_link_hash_indirect
1561 || h->root.type == bfd_link_hash_warning)
1562 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1563 }
1564
1565 eh = (struct elf_x86_link_hash_entry *) h;
1566 if (h != NULL)
1567 {
1568 if (r_type == R_386_GOTOFF)
1569 eh->gotoff_ref = 1;
1570
1571 /* It is referenced by a non-shared object. */
1572 h->ref_regular = 1;
1573 }
1574
1575 if (r_type == R_386_GOT32X
1576 && (h == NULL || h->type != STT_GNU_IFUNC))
1577 {
1578 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1579 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1580 &r_type, irel, h,
1581 &converted, info))
1582 goto error_return;
1583 }
1584
1585 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1586 symtab_hdr, &no_dynreloc))
1587 return false;
1588
1589 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1590 symtab_hdr, sym_hashes,
1591 &r_type, GOT_UNKNOWN,
1592 rel, rel_end, h, r_symndx, false))
1593 goto error_return;
1594
1595 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1596 if (h == htab->elf.hgot)
1597 htab->got_referenced = true;
1598
1599 switch (r_type)
1600 {
1601 case R_386_TLS_LDM:
1602 htab->tls_ld_or_ldm_got.refcount = 1;
1603 goto create_got;
1604
1605 case R_386_PLT32:
1606 /* This symbol requires a procedure linkage table entry. We
1607 actually build the entry in adjust_dynamic_symbol,
1608 because this might be a case of linking PIC code which is
1609 never referenced by a dynamic object, in which case we
1610 don't need to generate a procedure linkage table entry
1611 after all. */
1612
1613 /* If this is a local symbol, we resolve it directly without
1614 creating a procedure linkage table entry. */
1615 if (h == NULL)
1616 continue;
1617
1618 eh->zero_undefweak &= 0x2;
1619 h->needs_plt = 1;
1620 h->plt.refcount = 1;
1621 break;
1622
1623 case R_386_SIZE32:
1624 size_reloc = true;
1625 goto do_size;
1626
1627 case R_386_TLS_IE_32:
1628 case R_386_TLS_IE:
1629 case R_386_TLS_GOTIE:
1630 if (!bfd_link_executable (info))
1631 info->flags |= DF_STATIC_TLS;
1632 /* Fall through */
1633
1634 case R_386_GOT32:
1635 case R_386_GOT32X:
1636 case R_386_TLS_GD:
1637 case R_386_TLS_GOTDESC:
1638 case R_386_TLS_DESC_CALL:
1639 /* This symbol requires a global offset table entry. */
1640 {
1641 int tls_type, old_tls_type;
1642
1643 switch (r_type)
1644 {
1645 default:
1646 case R_386_GOT32:
1647 case R_386_GOT32X:
1648 tls_type = GOT_NORMAL;
1649 break;
1650 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1651 case R_386_TLS_GOTDESC:
1652 case R_386_TLS_DESC_CALL:
1653 tls_type = GOT_TLS_GDESC; break;
1654 case R_386_TLS_IE_32:
1655 if (ELF32_R_TYPE (rel->r_info) == r_type)
1656 tls_type = GOT_TLS_IE_NEG;
1657 else
1658 /* If this is a GD->IE transition, we may use either of
1659 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1660 tls_type = GOT_TLS_IE;
1661 break;
1662 case R_386_TLS_IE:
1663 case R_386_TLS_GOTIE:
1664 tls_type = GOT_TLS_IE_POS; break;
1665 }
1666
1667 if (h != NULL)
1668 {
1669 h->got.refcount = 1;
1670 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1671 }
1672 else
1673 {
1674 bfd_signed_vma *local_got_refcounts;
1675
1676 /* This is a global offset table entry for a local symbol. */
1677 local_got_refcounts = elf_local_got_refcounts (abfd);
1678 if (local_got_refcounts == NULL)
1679 {
1680 bfd_size_type size;
1681
1682 size = symtab_hdr->sh_info;
1683 size *= (sizeof (bfd_signed_vma)
1684 + sizeof (bfd_vma) + sizeof(char));
1685 local_got_refcounts = (bfd_signed_vma *)
1686 bfd_zalloc (abfd, size);
1687 if (local_got_refcounts == NULL)
1688 goto error_return;
1689 elf_local_got_refcounts (abfd) = local_got_refcounts;
1690 elf_x86_local_tlsdesc_gotent (abfd)
1691 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1692 elf_x86_local_got_tls_type (abfd)
1693 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1694 }
1695 local_got_refcounts[r_symndx] = 1;
1696 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1697 }
1698
1699 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1700 tls_type |= old_tls_type;
1701 /* If a TLS symbol is accessed using IE at least once,
1702 there is no point to use dynamic model for it. */
1703 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1704 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1705 || (tls_type & GOT_TLS_IE) == 0))
1706 {
1707 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1708 tls_type = old_tls_type;
1709 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1710 && GOT_TLS_GD_ANY_P (tls_type))
1711 tls_type |= old_tls_type;
1712 else
1713 {
1714 if (h)
1715 name = h->root.root.string;
1716 else
1717 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1718 NULL);
1719 _bfd_error_handler
1720 /* xgettext:c-format */
1721 (_("%pB: `%s' accessed both as normal and "
1722 "thread local symbol"),
1723 abfd, name);
1724 bfd_set_error (bfd_error_bad_value);
1725 goto error_return;
1726 }
1727 }
1728
1729 if (old_tls_type != tls_type)
1730 {
1731 if (h != NULL)
1732 elf_x86_hash_entry (h)->tls_type = tls_type;
1733 else
1734 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1735 }
1736 }
1737 /* Fall through */
1738
1739 case R_386_GOTOFF:
1740 case R_386_GOTPC:
1741 create_got:
1742 if (r_type != R_386_TLS_IE)
1743 {
1744 if (eh != NULL)
1745 {
1746 eh->zero_undefweak &= 0x2;
1747
1748 /* Need GOT to resolve undefined weak symbol to 0. */
1749 if (r_type == R_386_GOTOFF
1750 && h->root.type == bfd_link_hash_undefweak
1751 && bfd_link_executable (info))
1752 htab->got_referenced = true;
1753 }
1754 break;
1755 }
1756 /* Fall through */
1757
1758 case R_386_TLS_LE_32:
1759 case R_386_TLS_LE:
1760 if (eh != NULL)
1761 eh->zero_undefweak &= 0x2;
1762 if (bfd_link_executable (info))
1763 break;
1764 info->flags |= DF_STATIC_TLS;
1765 goto do_relocation;
1766
1767 case R_386_32:
1768 case R_386_PC32:
1769 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1770 eh->zero_undefweak |= 0x2;
1771 do_relocation:
1772 /* We are called after all symbols have been resolved. Only
1773 relocation against STT_GNU_IFUNC symbol must go through
1774 PLT. */
1775 if (h != NULL
1776 && (bfd_link_executable (info)
1777 || h->type == STT_GNU_IFUNC))
1778 {
1779 bool func_pointer_ref = false;
1780
1781 if (r_type == R_386_PC32)
1782 {
1783 /* Since something like ".long foo - ." may be used
1784 as pointer, make sure that PLT is used if foo is
1785 a function defined in a shared library. */
1786 if ((sec->flags & SEC_CODE) == 0)
1787 h->pointer_equality_needed = 1;
1788 else if (h->type == STT_GNU_IFUNC
1789 && bfd_link_pic (info))
1790 {
1791 _bfd_error_handler
1792 /* xgettext:c-format */
1793 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1794 abfd, h->root.root.string);
1795 bfd_set_error (bfd_error_bad_value);
1796 goto error_return;
1797 }
1798 }
1799 else
1800 {
1801 h->pointer_equality_needed = 1;
1802 /* R_386_32 can be resolved at run-time. */
1803 if (r_type == R_386_32
1804 && (sec->flags & SEC_READONLY) == 0)
1805 func_pointer_ref = true;
1806 }
1807
1808 if (!func_pointer_ref)
1809 {
1810 /* If this reloc is in a read-only section, we might
1811 need a copy reloc. We can't check reliably at this
1812 stage whether the section is read-only, as input
1813 sections have not yet been mapped to output sections.
1814 Tentatively set the flag for now, and correct in
1815 adjust_dynamic_symbol. */
1816 h->non_got_ref = 1;
1817
1818 /* We may need a .plt entry if the symbol is a function
1819 defined in a shared lib or is a function referenced
1820 from the code or read-only section. */
1821 if (!h->def_regular
1822 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1823 h->plt.refcount = 1;
1824 }
1825 }
1826
1827 size_reloc = false;
1828 do_size:
1829 if (!no_dynreloc
1830 && NEED_DYNAMIC_RELOCATION_P (info, false, h, sec, r_type,
1831 R_386_32))
1832 {
1833 struct elf_dyn_relocs *p;
1834 struct elf_dyn_relocs **head;
1835
1836 /* We must copy these reloc types into the output file.
1837 Create a reloc section in dynobj and make room for
1838 this reloc. */
1839 if (sreloc == NULL)
1840 {
1841 sreloc = _bfd_elf_make_dynamic_reloc_section
1842 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ false);
1843
1844 if (sreloc == NULL)
1845 goto error_return;
1846 }
1847
1848 /* If this is a global symbol, we count the number of
1849 relocations we need for this symbol. */
1850 if (h != NULL)
1851 {
1852 head = &h->dyn_relocs;
1853 }
1854 else
1855 {
1856 /* Track dynamic relocs needed for local syms too.
1857 We really need local syms available to do this
1858 easily. Oh well. */
1859 void **vpp;
1860 asection *s;
1861
1862 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1863 abfd, r_symndx);
1864 if (isym == NULL)
1865 goto error_return;
1866
1867 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1868 if (s == NULL)
1869 s = sec;
1870
1871 vpp = &elf_section_data (s)->local_dynrel;
1872 head = (struct elf_dyn_relocs **)vpp;
1873 }
1874
1875 p = *head;
1876 if (p == NULL || p->sec != sec)
1877 {
1878 size_t amt = sizeof *p;
1879 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1880 amt);
1881 if (p == NULL)
1882 goto error_return;
1883 p->next = *head;
1884 *head = p;
1885 p->sec = sec;
1886 p->count = 0;
1887 p->pc_count = 0;
1888 }
1889
1890 p->count += 1;
1891 /* Count size relocation as PC-relative relocation. */
1892 if (r_type == R_386_PC32 || size_reloc)
1893 p->pc_count += 1;
1894 }
1895 break;
1896
1897 /* This relocation describes the C++ object vtable hierarchy.
1898 Reconstruct it for later use during GC. */
1899 case R_386_GNU_VTINHERIT:
1900 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1901 goto error_return;
1902 break;
1903
1904 /* This relocation describes which C++ vtable entries are actually
1905 used. Record for later use during GC. */
1906 case R_386_GNU_VTENTRY:
1907 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1908 goto error_return;
1909 break;
1910
1911 default:
1912 break;
1913 }
1914 }
1915
1916 if (elf_section_data (sec)->this_hdr.contents != contents)
1917 {
1918 if (!converted && !info->keep_memory)
1919 free (contents);
1920 else
1921 {
1922 /* Cache the section contents for elf_link_input_bfd if any
1923 load is converted or --no-keep-memory isn't used. */
1924 elf_section_data (sec)->this_hdr.contents = contents;
1925 }
1926 }
1927
1928 /* Cache relocations if any load is converted. */
1929 if (elf_section_data (sec)->relocs != relocs && converted)
1930 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1931
1932 return true;
1933
1934 error_return:
1935 if (elf_section_data (sec)->this_hdr.contents != contents)
1936 free (contents);
1937 sec->check_relocs_failed = 1;
1938 return false;
1939 }
1940
1941 /* Set the correct type for an x86 ELF section. We do this by the
1942 section name, which is a hack, but ought to work. */
1943
1944 static bool
1945 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1946 Elf_Internal_Shdr *hdr,
1947 asection *sec)
1948 {
1949 const char *name;
1950
1951 name = bfd_section_name (sec);
1952
1953 /* This is an ugly, but unfortunately necessary hack that is
1954 needed when producing EFI binaries on x86. It tells
1955 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1956 containing ELF relocation info. We need this hack in order to
1957 be able to generate ELF binaries that can be translated into
1958 EFI applications (which are essentially COFF objects). Those
1959 files contain a COFF ".reloc" section inside an ELFNN object,
1960 which would normally cause BFD to segfault because it would
1961 attempt to interpret this section as containing relocation
1962 entries for section "oc". With this hack enabled, ".reloc"
1963 will be treated as a normal data section, which will avoid the
1964 segfault. However, you won't be able to create an ELFNN binary
1965 with a section named "oc" that needs relocations, but that's
1966 the kind of ugly side-effects you get when detecting section
1967 types based on their names... In practice, this limitation is
1968 unlikely to bite. */
1969 if (strcmp (name, ".reloc") == 0)
1970 hdr->sh_type = SHT_PROGBITS;
1971
1972 return true;
1973 }
1974
1975 /* Return the relocation value for @tpoff relocation
1976 if STT_TLS virtual address is ADDRESS. */
1977
1978 static bfd_vma
1979 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1980 {
1981 struct elf_link_hash_table *htab = elf_hash_table (info);
1982 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1983 bfd_vma static_tls_size;
1984
1985 /* If tls_sec is NULL, we should have signalled an error already. */
1986 if (htab->tls_sec == NULL)
1987 return 0;
1988
1989 /* Consider special static TLS alignment requirements. */
1990 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1991 return static_tls_size + htab->tls_sec->vma - address;
1992 }
1993
1994 /* Relocate an i386 ELF section. */
1995
1996 static int
1997 elf_i386_relocate_section (bfd *output_bfd,
1998 struct bfd_link_info *info,
1999 bfd *input_bfd,
2000 asection *input_section,
2001 bfd_byte *contents,
2002 Elf_Internal_Rela *relocs,
2003 Elf_Internal_Sym *local_syms,
2004 asection **local_sections)
2005 {
2006 struct elf_x86_link_hash_table *htab;
2007 Elf_Internal_Shdr *symtab_hdr;
2008 struct elf_link_hash_entry **sym_hashes;
2009 bfd_vma *local_got_offsets;
2010 bfd_vma *local_tlsdesc_gotents;
2011 Elf_Internal_Rela *rel;
2012 Elf_Internal_Rela *wrel;
2013 Elf_Internal_Rela *relend;
2014 bool is_vxworks_tls;
2015 unsigned plt_entry_size;
2016
2017 /* Skip if check_relocs failed. */
2018 if (input_section->check_relocs_failed)
2019 return false;
2020
2021 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2022 if (htab == NULL)
2023 return false;
2024
2025 if (!is_x86_elf (input_bfd, htab))
2026 {
2027 bfd_set_error (bfd_error_wrong_format);
2028 return false;
2029 }
2030
2031 symtab_hdr = &elf_symtab_hdr (input_bfd);
2032 sym_hashes = elf_sym_hashes (input_bfd);
2033 local_got_offsets = elf_local_got_offsets (input_bfd);
2034 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2035 /* We have to handle relocations in vxworks .tls_vars sections
2036 specially, because the dynamic loader is 'weird'. */
2037 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2038 && bfd_link_pic (info)
2039 && !strcmp (input_section->output_section->name,
2040 ".tls_vars"));
2041
2042 _bfd_x86_elf_set_tls_module_base (info);
2043
2044 plt_entry_size = htab->plt.plt_entry_size;
2045
2046 rel = wrel = relocs;
2047 relend = relocs + input_section->reloc_count;
2048 for (; rel < relend; wrel++, rel++)
2049 {
2050 unsigned int r_type, r_type_tls;
2051 reloc_howto_type *howto;
2052 unsigned long r_symndx;
2053 struct elf_link_hash_entry *h;
2054 struct elf_x86_link_hash_entry *eh;
2055 Elf_Internal_Sym *sym;
2056 asection *sec;
2057 bfd_vma off, offplt, plt_offset;
2058 bfd_vma relocation;
2059 bool unresolved_reloc;
2060 bfd_reloc_status_type r;
2061 unsigned int indx;
2062 int tls_type;
2063 bfd_vma st_size;
2064 asection *resolved_plt;
2065 bool resolved_to_zero;
2066 bool relative_reloc;
2067
2068 r_type = ELF32_R_TYPE (rel->r_info);
2069 if (r_type == R_386_GNU_VTINHERIT
2070 || r_type == R_386_GNU_VTENTRY)
2071 {
2072 if (wrel != rel)
2073 *wrel = *rel;
2074 continue;
2075 }
2076
2077 howto = elf_i386_rtype_to_howto (r_type);
2078 if (howto == NULL)
2079 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2080
2081 r_symndx = ELF32_R_SYM (rel->r_info);
2082 h = NULL;
2083 sym = NULL;
2084 sec = NULL;
2085 unresolved_reloc = false;
2086 if (r_symndx < symtab_hdr->sh_info)
2087 {
2088 sym = local_syms + r_symndx;
2089 sec = local_sections[r_symndx];
2090 relocation = (sec->output_section->vma
2091 + sec->output_offset
2092 + sym->st_value);
2093 st_size = sym->st_size;
2094
2095 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2096 && ((sec->flags & SEC_MERGE) != 0
2097 || (bfd_link_relocatable (info)
2098 && sec->output_offset != 0)))
2099 {
2100 bfd_vma addend;
2101 bfd_byte *where = contents + rel->r_offset;
2102
2103 switch (howto->size)
2104 {
2105 case 0:
2106 addend = bfd_get_8 (input_bfd, where);
2107 if (howto->pc_relative)
2108 {
2109 addend = (addend ^ 0x80) - 0x80;
2110 addend += 1;
2111 }
2112 break;
2113 case 1:
2114 addend = bfd_get_16 (input_bfd, where);
2115 if (howto->pc_relative)
2116 {
2117 addend = (addend ^ 0x8000) - 0x8000;
2118 addend += 2;
2119 }
2120 break;
2121 case 2:
2122 addend = bfd_get_32 (input_bfd, where);
2123 if (howto->pc_relative)
2124 {
2125 addend = (addend ^ 0x80000000) - 0x80000000;
2126 addend += 4;
2127 }
2128 break;
2129 default:
2130 abort ();
2131 }
2132
2133 if (bfd_link_relocatable (info))
2134 addend += sec->output_offset;
2135 else
2136 {
2137 asection *msec = sec;
2138 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2139 addend);
2140 addend -= relocation;
2141 addend += msec->output_section->vma + msec->output_offset;
2142 }
2143
2144 switch (howto->size)
2145 {
2146 case 0:
2147 /* FIXME: overflow checks. */
2148 if (howto->pc_relative)
2149 addend -= 1;
2150 bfd_put_8 (input_bfd, addend, where);
2151 break;
2152 case 1:
2153 if (howto->pc_relative)
2154 addend -= 2;
2155 bfd_put_16 (input_bfd, addend, where);
2156 break;
2157 case 2:
2158 if (howto->pc_relative)
2159 addend -= 4;
2160 bfd_put_32 (input_bfd, addend, where);
2161 break;
2162 }
2163 }
2164 else if (!bfd_link_relocatable (info)
2165 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2166 {
2167 /* Relocate against local STT_GNU_IFUNC symbol. */
2168 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2169 false);
2170 if (h == NULL)
2171 abort ();
2172
2173 /* Set STT_GNU_IFUNC symbol value. */
2174 h->root.u.def.value = sym->st_value;
2175 h->root.u.def.section = sec;
2176 }
2177 }
2178 else
2179 {
2180 bool warned ATTRIBUTE_UNUSED;
2181 bool ignored ATTRIBUTE_UNUSED;
2182
2183 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2184 r_symndx, symtab_hdr, sym_hashes,
2185 h, sec, relocation,
2186 unresolved_reloc, warned, ignored);
2187 st_size = h->size;
2188 }
2189
2190 if (sec != NULL && discarded_section (sec))
2191 {
2192 _bfd_clear_contents (howto, input_bfd, input_section,
2193 contents, rel->r_offset);
2194 wrel->r_offset = rel->r_offset;
2195 wrel->r_info = 0;
2196 wrel->r_addend = 0;
2197
2198 /* For ld -r, remove relocations in debug sections against
2199 sections defined in discarded sections. Not done for
2200 eh_frame editing code expects to be present. */
2201 if (bfd_link_relocatable (info)
2202 && (input_section->flags & SEC_DEBUGGING))
2203 wrel--;
2204
2205 continue;
2206 }
2207
2208 if (bfd_link_relocatable (info))
2209 {
2210 if (wrel != rel)
2211 *wrel = *rel;
2212 continue;
2213 }
2214
2215 eh = (struct elf_x86_link_hash_entry *) h;
2216
2217 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2218 it here if it is defined in a non-shared object. */
2219 if (h != NULL
2220 && h->type == STT_GNU_IFUNC
2221 && h->def_regular)
2222 {
2223 asection *gotplt, *base_got;
2224 bfd_vma plt_index;
2225 const char *name;
2226
2227 if ((input_section->flags & SEC_ALLOC) == 0)
2228 {
2229 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2230 STT_GNU_IFUNC symbol as STT_FUNC. */
2231 if (elf_section_type (input_section) == SHT_NOTE)
2232 goto skip_ifunc;
2233 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2234 sections because such sections are not SEC_ALLOC and
2235 thus ld.so will not process them. */
2236 if ((input_section->flags & SEC_DEBUGGING) != 0)
2237 continue;
2238 abort ();
2239 }
2240
2241 /* STT_GNU_IFUNC symbol must go through PLT. */
2242 if (htab->elf.splt != NULL)
2243 {
2244 if (htab->plt_second != NULL)
2245 {
2246 resolved_plt = htab->plt_second;
2247 plt_offset = eh->plt_second.offset;
2248 }
2249 else
2250 {
2251 resolved_plt = htab->elf.splt;
2252 plt_offset = h->plt.offset;
2253 }
2254 gotplt = htab->elf.sgotplt;
2255 }
2256 else
2257 {
2258 resolved_plt = htab->elf.iplt;
2259 plt_offset = h->plt.offset;
2260 gotplt = htab->elf.igotplt;
2261 }
2262
2263 switch (r_type)
2264 {
2265 default:
2266 break;
2267
2268 case R_386_GOT32:
2269 case R_386_GOT32X:
2270 base_got = htab->elf.sgot;
2271 off = h->got.offset;
2272
2273 if (base_got == NULL)
2274 abort ();
2275
2276 if (off == (bfd_vma) -1)
2277 {
2278 /* We can't use h->got.offset here to save state, or
2279 even just remember the offset, as finish_dynamic_symbol
2280 would use that as offset into .got. */
2281
2282 if (h->plt.offset == (bfd_vma) -1)
2283 abort ();
2284
2285 if (htab->elf.splt != NULL)
2286 {
2287 plt_index = (h->plt.offset / plt_entry_size
2288 - htab->plt.has_plt0);
2289 off = (plt_index + 3) * 4;
2290 base_got = htab->elf.sgotplt;
2291 }
2292 else
2293 {
2294 plt_index = h->plt.offset / plt_entry_size;
2295 off = plt_index * 4;
2296 base_got = htab->elf.igotplt;
2297 }
2298
2299 if (h->dynindx == -1
2300 || h->forced_local
2301 || info->symbolic)
2302 {
2303 /* This references the local defitionion. We must
2304 initialize this entry in the global offset table.
2305 Since the offset must always be a multiple of 8,
2306 we use the least significant bit to record
2307 whether we have initialized it already.
2308
2309 When doing a dynamic link, we create a .rela.got
2310 relocation entry to initialize the value. This
2311 is done in the finish_dynamic_symbol routine. */
2312 if ((off & 1) != 0)
2313 off &= ~1;
2314 else
2315 {
2316 bfd_put_32 (output_bfd, relocation,
2317 base_got->contents + off);
2318 h->got.offset |= 1;
2319 }
2320 }
2321
2322 relocation = off;
2323 }
2324 else
2325 relocation = (base_got->output_section->vma
2326 + base_got->output_offset + off
2327 - gotplt->output_section->vma
2328 - gotplt->output_offset);
2329
2330 if (rel->r_offset > 1
2331 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2332 && *(contents + rel->r_offset - 2) != 0x8d)
2333 {
2334 if (bfd_link_pic (info))
2335 goto disallow_got32;
2336
2337 /* Add the GOT base if there is no base register. */
2338 relocation += (gotplt->output_section->vma
2339 + gotplt->output_offset);
2340 }
2341 else if (htab->elf.splt == NULL)
2342 {
2343 /* Adjust for static executables. */
2344 relocation += gotplt->output_offset;
2345 }
2346
2347 goto do_relocation;
2348 }
2349
2350 if (h->plt.offset == (bfd_vma) -1)
2351 {
2352 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2353 if (r_type == R_386_32
2354 && (input_section->flags & SEC_CODE) == 0)
2355 goto do_ifunc_pointer;
2356 goto bad_ifunc_reloc;
2357 }
2358
2359 relocation = (resolved_plt->output_section->vma
2360 + resolved_plt->output_offset + plt_offset);
2361
2362 switch (r_type)
2363 {
2364 default:
2365 bad_ifunc_reloc:
2366 if (h->root.root.string)
2367 name = h->root.root.string;
2368 else
2369 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2370 NULL);
2371 _bfd_error_handler
2372 /* xgettext:c-format */
2373 (_("%pB: relocation %s against STT_GNU_IFUNC "
2374 "symbol `%s' isn't supported"), input_bfd,
2375 howto->name, name);
2376 bfd_set_error (bfd_error_bad_value);
2377 return false;
2378
2379 case R_386_32:
2380 /* Generate dynamic relcoation only when there is a
2381 non-GOT reference in a shared object. */
2382 if ((bfd_link_pic (info) && h->non_got_ref)
2383 || h->plt.offset == (bfd_vma) -1)
2384 {
2385 Elf_Internal_Rela outrel;
2386 asection *sreloc;
2387 bfd_vma offset;
2388
2389 do_ifunc_pointer:
2390 /* Need a dynamic relocation to get the real function
2391 adddress. */
2392 offset = _bfd_elf_section_offset (output_bfd,
2393 info,
2394 input_section,
2395 rel->r_offset);
2396 if (offset == (bfd_vma) -1
2397 || offset == (bfd_vma) -2)
2398 abort ();
2399
2400 outrel.r_offset = (input_section->output_section->vma
2401 + input_section->output_offset
2402 + offset);
2403
2404 if (POINTER_LOCAL_IFUNC_P (info, h))
2405 {
2406 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2407 h->root.root.string,
2408 h->root.u.def.section->owner);
2409
2410 /* This symbol is resolved locally. */
2411 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2412
2413 if (htab->params->report_relative_reloc)
2414 _bfd_x86_elf_link_report_relative_reloc
2415 (info, input_section, h, sym,
2416 "R_386_IRELATIVE", &outrel);
2417
2418 bfd_put_32 (output_bfd,
2419 (h->root.u.def.value
2420 + h->root.u.def.section->output_section->vma
2421 + h->root.u.def.section->output_offset),
2422 contents + offset);
2423 }
2424 else
2425 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2426
2427 /* Dynamic relocations are stored in
2428 1. .rel.ifunc section in PIC object.
2429 2. .rel.got section in dynamic executable.
2430 3. .rel.iplt section in static executable. */
2431 if (bfd_link_pic (info))
2432 sreloc = htab->elf.irelifunc;
2433 else if (htab->elf.splt != NULL)
2434 sreloc = htab->elf.srelgot;
2435 else
2436 sreloc = htab->elf.irelplt;
2437 elf_append_rel (output_bfd, sreloc, &outrel);
2438
2439 /* If this reloc is against an external symbol, we
2440 do not want to fiddle with the addend. Otherwise,
2441 we need to include the symbol value so that it
2442 becomes an addend for the dynamic reloc. For an
2443 internal symbol, we have updated addend. */
2444 continue;
2445 }
2446 /* FALLTHROUGH */
2447 case R_386_PC32:
2448 case R_386_PLT32:
2449 goto do_relocation;
2450
2451 case R_386_GOTOFF:
2452 relocation -= (gotplt->output_section->vma
2453 + gotplt->output_offset);
2454 goto do_relocation;
2455 }
2456 }
2457
2458 skip_ifunc:
2459 resolved_to_zero = (eh != NULL
2460 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2461
2462 switch (r_type)
2463 {
2464 case R_386_GOT32X:
2465 case R_386_GOT32:
2466 /* Relocation is to the entry for this symbol in the global
2467 offset table. */
2468 if (htab->elf.sgot == NULL)
2469 abort ();
2470
2471 relative_reloc = false;
2472 if (h != NULL)
2473 {
2474 off = h->got.offset;
2475 if (RESOLVED_LOCALLY_P (info, h, htab))
2476 {
2477 /* We must initialize this entry in the global offset
2478 table. Since the offset must always be a multiple
2479 of 4, we use the least significant bit to record
2480 whether we have initialized it already.
2481
2482 When doing a dynamic link, we create a .rel.got
2483 relocation entry to initialize the value. This
2484 is done in the finish_dynamic_symbol routine. */
2485 if ((off & 1) != 0)
2486 off &= ~1;
2487 else
2488 {
2489 bfd_put_32 (output_bfd, relocation,
2490 htab->elf.sgot->contents + off);
2491 h->got.offset |= 1;
2492
2493 if (GENERATE_RELATIVE_RELOC_P (info, h))
2494 {
2495 /* PR ld/21402: If this symbol isn't dynamic
2496 in PIC, generate R_386_RELATIVE here. */
2497 eh->no_finish_dynamic_symbol = 1;
2498 relative_reloc = true;
2499 }
2500 }
2501 }
2502 else
2503 unresolved_reloc = false;
2504 }
2505 else
2506 {
2507 if (local_got_offsets == NULL)
2508 abort ();
2509
2510 off = local_got_offsets[r_symndx];
2511
2512 /* The offset must always be a multiple of 4. We use
2513 the least significant bit to record whether we have
2514 already generated the necessary reloc. */
2515 if ((off & 1) != 0)
2516 off &= ~1;
2517 else
2518 {
2519 bfd_put_32 (output_bfd, relocation,
2520 htab->elf.sgot->contents + off);
2521 local_got_offsets[r_symndx] |= 1;
2522
2523 if (bfd_link_pic (info))
2524 relative_reloc = true;
2525 }
2526 }
2527
2528 if (relative_reloc)
2529 {
2530 asection *s;
2531 Elf_Internal_Rela outrel;
2532
2533 s = htab->elf.srelgot;
2534 if (s == NULL)
2535 abort ();
2536
2537 outrel.r_offset = (htab->elf.sgot->output_section->vma
2538 + htab->elf.sgot->output_offset
2539 + off);
2540 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2541
2542 if (htab->params->report_relative_reloc)
2543 _bfd_x86_elf_link_report_relative_reloc
2544 (info, input_section, h, sym, "R_386_RELATIVE",
2545 &outrel);
2546
2547 elf_append_rel (output_bfd, s, &outrel);
2548 }
2549
2550 if (off >= (bfd_vma) -2)
2551 abort ();
2552
2553 relocation = (htab->elf.sgot->output_section->vma
2554 + htab->elf.sgot->output_offset + off);
2555 if (rel->r_offset > 1
2556 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2557 && *(contents + rel->r_offset - 2) != 0x8d)
2558 {
2559 if (bfd_link_pic (info))
2560 {
2561 /* For PIC, disallow R_386_GOT32 without a base
2562 register, except for "lea foo@GOT, %reg", since
2563 we don't know what the GOT base is. */
2564 const char *name;
2565
2566 disallow_got32:
2567 if (h == NULL || h->root.root.string == NULL)
2568 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2569 NULL);
2570 else
2571 name = h->root.root.string;
2572
2573 _bfd_error_handler
2574 /* xgettext:c-format */
2575 (_("%pB: direct GOT relocation %s against `%s'"
2576 " without base register can not be used"
2577 " when making a shared object"),
2578 input_bfd, howto->name, name);
2579 bfd_set_error (bfd_error_bad_value);
2580 return false;
2581 }
2582 }
2583 else
2584 {
2585 /* Subtract the .got.plt section address only with a base
2586 register. */
2587 relocation -= (htab->elf.sgotplt->output_section->vma
2588 + htab->elf.sgotplt->output_offset);
2589 }
2590
2591 break;
2592
2593 case R_386_GOTOFF:
2594 /* Relocation is relative to the start of the global offset
2595 table. */
2596
2597 /* Check to make sure it isn't a protected function or data
2598 symbol for shared library since it may not be local when
2599 used as function address or with copy relocation. We also
2600 need to make sure that a symbol is referenced locally. */
2601 if (!bfd_link_executable (info) && h)
2602 {
2603 if (!h->def_regular)
2604 {
2605 const char *v;
2606
2607 switch (ELF_ST_VISIBILITY (h->other))
2608 {
2609 case STV_HIDDEN:
2610 v = _("hidden symbol");
2611 break;
2612 case STV_INTERNAL:
2613 v = _("internal symbol");
2614 break;
2615 case STV_PROTECTED:
2616 v = _("protected symbol");
2617 break;
2618 default:
2619 v = _("symbol");
2620 break;
2621 }
2622
2623 _bfd_error_handler
2624 /* xgettext:c-format */
2625 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2626 " `%s' can not be used when making a shared object"),
2627 input_bfd, v, h->root.root.string);
2628 bfd_set_error (bfd_error_bad_value);
2629 return false;
2630 }
2631 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2632 && (h->type == STT_FUNC
2633 || h->type == STT_OBJECT)
2634 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2635 {
2636 _bfd_error_handler
2637 /* xgettext:c-format */
2638 (_("%pB: relocation R_386_GOTOFF against protected %s"
2639 " `%s' can not be used when making a shared object"),
2640 input_bfd,
2641 h->type == STT_FUNC ? "function" : "data",
2642 h->root.root.string);
2643 bfd_set_error (bfd_error_bad_value);
2644 return false;
2645 }
2646 }
2647
2648 /* Note that sgot is not involved in this
2649 calculation. We always want the start of .got.plt. If we
2650 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2651 permitted by the ABI, we might have to change this
2652 calculation. */
2653 relocation -= htab->elf.sgotplt->output_section->vma
2654 + htab->elf.sgotplt->output_offset;
2655 break;
2656
2657 case R_386_GOTPC:
2658 /* Use global offset table as symbol value. */
2659 relocation = htab->elf.sgotplt->output_section->vma
2660 + htab->elf.sgotplt->output_offset;
2661 unresolved_reloc = false;
2662 break;
2663
2664 case R_386_PLT32:
2665 /* Relocation is to the entry for this symbol in the
2666 procedure linkage table. */
2667
2668 /* Resolve a PLT32 reloc against a local symbol directly,
2669 without using the procedure linkage table. */
2670 if (h == NULL)
2671 break;
2672
2673 if ((h->plt.offset == (bfd_vma) -1
2674 && eh->plt_got.offset == (bfd_vma) -1)
2675 || htab->elf.splt == NULL)
2676 {
2677 /* We didn't make a PLT entry for this symbol. This
2678 happens when statically linking PIC code, or when
2679 using -Bsymbolic. */
2680 break;
2681 }
2682
2683 if (h->plt.offset != (bfd_vma) -1)
2684 {
2685 if (htab->plt_second != NULL)
2686 {
2687 resolved_plt = htab->plt_second;
2688 plt_offset = eh->plt_second.offset;
2689 }
2690 else
2691 {
2692 resolved_plt = htab->elf.splt;
2693 plt_offset = h->plt.offset;
2694 }
2695 }
2696 else
2697 {
2698 resolved_plt = htab->plt_got;
2699 plt_offset = eh->plt_got.offset;
2700 }
2701
2702 relocation = (resolved_plt->output_section->vma
2703 + resolved_plt->output_offset
2704 + plt_offset);
2705 unresolved_reloc = false;
2706 break;
2707
2708 case R_386_SIZE32:
2709 /* Set to symbol size. */
2710 relocation = st_size;
2711 /* Fall through. */
2712
2713 case R_386_32:
2714 case R_386_PC32:
2715 if ((input_section->flags & SEC_ALLOC) == 0
2716 || is_vxworks_tls)
2717 break;
2718
2719 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, sec,
2720 false, resolved_to_zero,
2721 (r_type == R_386_PC32)))
2722 {
2723 Elf_Internal_Rela outrel;
2724 bool skip, relocate;
2725 asection *sreloc;
2726
2727 /* When generating a shared object, these relocations
2728 are copied into the output file to be resolved at run
2729 time. */
2730
2731 skip = false;
2732 relocate = false;
2733
2734 outrel.r_offset =
2735 _bfd_elf_section_offset (output_bfd, info, input_section,
2736 rel->r_offset);
2737 if (outrel.r_offset == (bfd_vma) -1)
2738 skip = true;
2739 else if (outrel.r_offset == (bfd_vma) -2)
2740 skip = true, relocate = true;
2741 outrel.r_offset += (input_section->output_section->vma
2742 + input_section->output_offset);
2743
2744 if (skip)
2745 memset (&outrel, 0, sizeof outrel);
2746 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2747 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2748 else
2749 {
2750 /* This symbol is local, or marked to become local. */
2751 relocate = true;
2752 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2753
2754 if (htab->params->report_relative_reloc)
2755 _bfd_x86_elf_link_report_relative_reloc
2756 (info, input_section, h, sym, "R_386_RELATIVE",
2757 &outrel);
2758 }
2759
2760 sreloc = elf_section_data (input_section)->sreloc;
2761
2762 if (sreloc == NULL || sreloc->contents == NULL)
2763 {
2764 r = bfd_reloc_notsupported;
2765 goto check_relocation_error;
2766 }
2767
2768 elf_append_rel (output_bfd, sreloc, &outrel);
2769
2770 /* If this reloc is against an external symbol, we do
2771 not want to fiddle with the addend. Otherwise, we
2772 need to include the symbol value so that it becomes
2773 an addend for the dynamic reloc. */
2774 if (! relocate)
2775 continue;
2776 }
2777 break;
2778
2779 case R_386_TLS_IE:
2780 if (!bfd_link_executable (info))
2781 {
2782 Elf_Internal_Rela outrel;
2783 asection *sreloc;
2784
2785 outrel.r_offset = rel->r_offset
2786 + input_section->output_section->vma
2787 + input_section->output_offset;
2788 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2789
2790 if (htab->params->report_relative_reloc)
2791 _bfd_x86_elf_link_report_relative_reloc
2792 (info, input_section, h, sym, "R_386_RELATIVE",
2793 &outrel);
2794
2795 sreloc = elf_section_data (input_section)->sreloc;
2796 if (sreloc == NULL)
2797 abort ();
2798 elf_append_rel (output_bfd, sreloc, &outrel);
2799 }
2800 /* Fall through */
2801
2802 case R_386_TLS_GD:
2803 case R_386_TLS_GOTDESC:
2804 case R_386_TLS_DESC_CALL:
2805 case R_386_TLS_IE_32:
2806 case R_386_TLS_GOTIE:
2807 tls_type = GOT_UNKNOWN;
2808 if (h == NULL && local_got_offsets)
2809 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2810 else if (h != NULL)
2811 tls_type = elf_x86_hash_entry(h)->tls_type;
2812 if (tls_type == GOT_TLS_IE)
2813 tls_type = GOT_TLS_IE_NEG;
2814
2815 r_type_tls = r_type;
2816 if (! elf_i386_tls_transition (info, input_bfd,
2817 input_section, contents,
2818 symtab_hdr, sym_hashes,
2819 &r_type_tls, tls_type, rel,
2820 relend, h, r_symndx, true))
2821 return false;
2822
2823 if (r_type_tls == R_386_TLS_LE_32)
2824 {
2825 BFD_ASSERT (! unresolved_reloc);
2826 if (r_type == R_386_TLS_GD)
2827 {
2828 unsigned int type;
2829 bfd_vma roff;
2830
2831 /* GD->LE transition. */
2832 type = *(contents + rel->r_offset - 2);
2833 if (type == 0x04)
2834 {
2835 /* Change
2836 leal foo@tlsgd(,%ebx,1), %eax
2837 call ___tls_get_addr@PLT
2838 into:
2839 movl %gs:0, %eax
2840 subl $foo@tpoff, %eax
2841 (6 byte form of subl). */
2842 roff = rel->r_offset + 5;
2843 }
2844 else
2845 {
2846 /* Change
2847 leal foo@tlsgd(%ebx), %eax
2848 call ___tls_get_addr@PLT
2849 nop
2850 or
2851 leal foo@tlsgd(%reg), %eax
2852 call *___tls_get_addr@GOT(%reg)
2853 which may be converted to
2854 addr32 call ___tls_get_addr
2855 into:
2856 movl %gs:0, %eax; subl $foo@tpoff, %eax
2857 (6 byte form of subl). */
2858 roff = rel->r_offset + 6;
2859 }
2860 memcpy (contents + roff - 8,
2861 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2862 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2863 contents + roff);
2864 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2865 rel++;
2866 wrel++;
2867 continue;
2868 }
2869 else if (r_type == R_386_TLS_GOTDESC)
2870 {
2871 /* GDesc -> LE transition.
2872 It's originally something like:
2873 leal x@tlsdesc(%ebx), %eax
2874
2875 leal x@ntpoff, %eax
2876
2877 Registers other than %eax may be set up here. */
2878
2879 unsigned int val;
2880 bfd_vma roff;
2881
2882 roff = rel->r_offset;
2883 val = bfd_get_8 (input_bfd, contents + roff - 1);
2884
2885 /* Now modify the instruction as appropriate. */
2886 /* aoliva FIXME: remove the above and xor the byte
2887 below with 0x86. */
2888 bfd_put_8 (output_bfd, val ^ 0x86,
2889 contents + roff - 1);
2890 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2891 contents + roff);
2892 continue;
2893 }
2894 else if (r_type == R_386_TLS_DESC_CALL)
2895 {
2896 /* GDesc -> LE transition.
2897 It's originally:
2898 call *(%eax)
2899 Turn it into:
2900 xchg %ax,%ax */
2901
2902 bfd_vma roff;
2903
2904 roff = rel->r_offset;
2905 bfd_put_8 (output_bfd, 0x66, contents + roff);
2906 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2907 continue;
2908 }
2909 else if (r_type == R_386_TLS_IE)
2910 {
2911 unsigned int val;
2912
2913 /* IE->LE transition:
2914 Originally it can be one of:
2915 movl foo, %eax
2916 movl foo, %reg
2917 addl foo, %reg
2918 We change it into:
2919 movl $foo, %eax
2920 movl $foo, %reg
2921 addl $foo, %reg. */
2922 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2923 if (val == 0xa1)
2924 {
2925 /* movl foo, %eax. */
2926 bfd_put_8 (output_bfd, 0xb8,
2927 contents + rel->r_offset - 1);
2928 }
2929 else
2930 {
2931 unsigned int type;
2932
2933 type = bfd_get_8 (input_bfd,
2934 contents + rel->r_offset - 2);
2935 switch (type)
2936 {
2937 case 0x8b:
2938 /* movl */
2939 bfd_put_8 (output_bfd, 0xc7,
2940 contents + rel->r_offset - 2);
2941 bfd_put_8 (output_bfd,
2942 0xc0 | ((val >> 3) & 7),
2943 contents + rel->r_offset - 1);
2944 break;
2945 case 0x03:
2946 /* addl */
2947 bfd_put_8 (output_bfd, 0x81,
2948 contents + rel->r_offset - 2);
2949 bfd_put_8 (output_bfd,
2950 0xc0 | ((val >> 3) & 7),
2951 contents + rel->r_offset - 1);
2952 break;
2953 default:
2954 BFD_FAIL ();
2955 break;
2956 }
2957 }
2958 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2959 contents + rel->r_offset);
2960 continue;
2961 }
2962 else
2963 {
2964 unsigned int val, type;
2965
2966 /* {IE_32,GOTIE}->LE transition:
2967 Originally it can be one of:
2968 subl foo(%reg1), %reg2
2969 movl foo(%reg1), %reg2
2970 addl foo(%reg1), %reg2
2971 We change it into:
2972 subl $foo, %reg2
2973 movl $foo, %reg2 (6 byte form)
2974 addl $foo, %reg2. */
2975 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2976 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2977 if (type == 0x8b)
2978 {
2979 /* movl */
2980 bfd_put_8 (output_bfd, 0xc7,
2981 contents + rel->r_offset - 2);
2982 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2983 contents + rel->r_offset - 1);
2984 }
2985 else if (type == 0x2b)
2986 {
2987 /* subl */
2988 bfd_put_8 (output_bfd, 0x81,
2989 contents + rel->r_offset - 2);
2990 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2991 contents + rel->r_offset - 1);
2992 }
2993 else if (type == 0x03)
2994 {
2995 /* addl */
2996 bfd_put_8 (output_bfd, 0x81,
2997 contents + rel->r_offset - 2);
2998 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2999 contents + rel->r_offset - 1);
3000 }
3001 else
3002 BFD_FAIL ();
3003 if (r_type == R_386_TLS_GOTIE)
3004 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3005 contents + rel->r_offset);
3006 else
3007 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3008 contents + rel->r_offset);
3009 continue;
3010 }
3011 }
3012
3013 if (htab->elf.sgot == NULL)
3014 abort ();
3015
3016 if (h != NULL)
3017 {
3018 off = h->got.offset;
3019 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3020 }
3021 else
3022 {
3023 if (local_got_offsets == NULL)
3024 abort ();
3025
3026 off = local_got_offsets[r_symndx];
3027 offplt = local_tlsdesc_gotents[r_symndx];
3028 }
3029
3030 if ((off & 1) != 0)
3031 off &= ~1;
3032 else
3033 {
3034 Elf_Internal_Rela outrel;
3035 int dr_type;
3036 asection *sreloc;
3037
3038 if (htab->elf.srelgot == NULL)
3039 abort ();
3040
3041 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3042
3043 if (GOT_TLS_GDESC_P (tls_type))
3044 {
3045 bfd_byte *loc;
3046 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3047 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3048 <= htab->elf.sgotplt->size);
3049 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3050 + htab->elf.sgotplt->output_offset
3051 + offplt
3052 + htab->sgotplt_jump_table_size);
3053 sreloc = htab->elf.srelplt;
3054 loc = sreloc->contents;
3055 loc += (htab->next_tls_desc_index++
3056 * sizeof (Elf32_External_Rel));
3057 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3058 <= sreloc->contents + sreloc->size);
3059 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3060 if (indx == 0)
3061 {
3062 BFD_ASSERT (! unresolved_reloc);
3063 bfd_put_32 (output_bfd,
3064 relocation - _bfd_x86_elf_dtpoff_base (info),
3065 htab->elf.sgotplt->contents + offplt
3066 + htab->sgotplt_jump_table_size + 4);
3067 }
3068 else
3069 {
3070 bfd_put_32 (output_bfd, 0,
3071 htab->elf.sgotplt->contents + offplt
3072 + htab->sgotplt_jump_table_size + 4);
3073 }
3074 }
3075
3076 sreloc = htab->elf.srelgot;
3077
3078 outrel.r_offset = (htab->elf.sgot->output_section->vma
3079 + htab->elf.sgot->output_offset + off);
3080
3081 if (GOT_TLS_GD_P (tls_type))
3082 dr_type = R_386_TLS_DTPMOD32;
3083 else if (GOT_TLS_GDESC_P (tls_type))
3084 goto dr_done;
3085 else if (tls_type == GOT_TLS_IE_POS)
3086 dr_type = R_386_TLS_TPOFF;
3087 else
3088 dr_type = R_386_TLS_TPOFF32;
3089
3090 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3091 bfd_put_32 (output_bfd,
3092 relocation - _bfd_x86_elf_dtpoff_base (info),
3093 htab->elf.sgot->contents + off);
3094 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3095 bfd_put_32 (output_bfd,
3096 _bfd_x86_elf_dtpoff_base (info) - relocation,
3097 htab->elf.sgot->contents + off);
3098 else if (dr_type != R_386_TLS_DESC)
3099 bfd_put_32 (output_bfd, 0,
3100 htab->elf.sgot->contents + off);
3101 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3102
3103 elf_append_rel (output_bfd, sreloc, &outrel);
3104
3105 if (GOT_TLS_GD_P (tls_type))
3106 {
3107 if (indx == 0)
3108 {
3109 BFD_ASSERT (! unresolved_reloc);
3110 bfd_put_32 (output_bfd,
3111 relocation - _bfd_x86_elf_dtpoff_base (info),
3112 htab->elf.sgot->contents + off + 4);
3113 }
3114 else
3115 {
3116 bfd_put_32 (output_bfd, 0,
3117 htab->elf.sgot->contents + off + 4);
3118 outrel.r_info = ELF32_R_INFO (indx,
3119 R_386_TLS_DTPOFF32);
3120 outrel.r_offset += 4;
3121 elf_append_rel (output_bfd, sreloc, &outrel);
3122 }
3123 }
3124 else if (tls_type == GOT_TLS_IE_BOTH)
3125 {
3126 bfd_put_32 (output_bfd,
3127 (indx == 0
3128 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3129 : 0),
3130 htab->elf.sgot->contents + off + 4);
3131 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3132 outrel.r_offset += 4;
3133 elf_append_rel (output_bfd, sreloc, &outrel);
3134 }
3135
3136 dr_done:
3137 if (h != NULL)
3138 h->got.offset |= 1;
3139 else
3140 local_got_offsets[r_symndx] |= 1;
3141 }
3142
3143 if (off >= (bfd_vma) -2
3144 && ! GOT_TLS_GDESC_P (tls_type))
3145 abort ();
3146 if (r_type_tls == R_386_TLS_GOTDESC
3147 || r_type_tls == R_386_TLS_DESC_CALL)
3148 {
3149 relocation = htab->sgotplt_jump_table_size + offplt;
3150 unresolved_reloc = false;
3151 }
3152 else if (r_type_tls == r_type)
3153 {
3154 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3155 + htab->elf.sgotplt->output_offset;
3156 relocation = htab->elf.sgot->output_section->vma
3157 + htab->elf.sgot->output_offset + off - g_o_t;
3158 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3159 && tls_type == GOT_TLS_IE_BOTH)
3160 relocation += 4;
3161 if (r_type == R_386_TLS_IE)
3162 relocation += g_o_t;
3163 unresolved_reloc = false;
3164 }
3165 else if (r_type == R_386_TLS_GD)
3166 {
3167 unsigned int val, type;
3168 bfd_vma roff;
3169
3170 /* GD->IE transition. */
3171 type = *(contents + rel->r_offset - 2);
3172 val = *(contents + rel->r_offset - 1);
3173 if (type == 0x04)
3174 {
3175 /* Change
3176 leal foo@tlsgd(,%ebx,1), %eax
3177 call ___tls_get_addr@PLT
3178 into:
3179 movl %gs:0, %eax
3180 subl $foo@gottpoff(%ebx), %eax. */
3181 val >>= 3;
3182 roff = rel->r_offset - 3;
3183 }
3184 else
3185 {
3186 /* Change
3187 leal foo@tlsgd(%ebx), %eax
3188 call ___tls_get_addr@PLT
3189 nop
3190 or
3191 leal foo@tlsgd(%reg), %eax
3192 call *___tls_get_addr@GOT(%reg)
3193 which may be converted to
3194 addr32 call ___tls_get_addr
3195 into:
3196 movl %gs:0, %eax;
3197 subl $foo@gottpoff(%reg), %eax. */
3198 roff = rel->r_offset - 2;
3199 }
3200 memcpy (contents + roff,
3201 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3202 contents[roff + 7] = 0x80 | (val & 7);
3203 /* If foo is used only with foo@gotntpoff(%reg) and
3204 foo@indntpoff, but not with foo@gottpoff(%reg), change
3205 subl $foo@gottpoff(%reg), %eax
3206 into:
3207 addl $foo@gotntpoff(%reg), %eax. */
3208 if (tls_type == GOT_TLS_IE_POS)
3209 contents[roff + 6] = 0x03;
3210 bfd_put_32 (output_bfd,
3211 htab->elf.sgot->output_section->vma
3212 + htab->elf.sgot->output_offset + off
3213 - htab->elf.sgotplt->output_section->vma
3214 - htab->elf.sgotplt->output_offset,
3215 contents + roff + 8);
3216 /* Skip R_386_PLT32 and R_386_GOT32X. */
3217 rel++;
3218 wrel++;
3219 continue;
3220 }
3221 else if (r_type == R_386_TLS_GOTDESC)
3222 {
3223 /* GDesc -> IE transition.
3224 It's originally something like:
3225 leal x@tlsdesc(%ebx), %eax
3226
3227 Change it to:
3228 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3229 or:
3230 movl x@gottpoff(%ebx), %eax # before negl %eax
3231
3232 Registers other than %eax may be set up here. */
3233
3234 bfd_vma roff;
3235
3236 /* First, make sure it's a leal adding ebx to a 32-bit
3237 offset into any register, although it's probably
3238 almost always going to be eax. */
3239 roff = rel->r_offset;
3240
3241 /* Now modify the instruction as appropriate. */
3242 /* To turn a leal into a movl in the form we use it, it
3243 suffices to change the first byte from 0x8d to 0x8b.
3244 aoliva FIXME: should we decide to keep the leal, all
3245 we have to do is remove the statement below, and
3246 adjust the relaxation of R_386_TLS_DESC_CALL. */
3247 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3248
3249 if (tls_type == GOT_TLS_IE_BOTH)
3250 off += 4;
3251
3252 bfd_put_32 (output_bfd,
3253 htab->elf.sgot->output_section->vma
3254 + htab->elf.sgot->output_offset + off
3255 - htab->elf.sgotplt->output_section->vma
3256 - htab->elf.sgotplt->output_offset,
3257 contents + roff);
3258 continue;
3259 }
3260 else if (r_type == R_386_TLS_DESC_CALL)
3261 {
3262 /* GDesc -> IE transition.
3263 It's originally:
3264 call *(%eax)
3265
3266 Change it to:
3267 xchg %ax,%ax
3268 or
3269 negl %eax
3270 depending on how we transformed the TLS_GOTDESC above.
3271 */
3272
3273 bfd_vma roff;
3274
3275 roff = rel->r_offset;
3276
3277 /* Now modify the instruction as appropriate. */
3278 if (tls_type != GOT_TLS_IE_NEG)
3279 {
3280 /* xchg %ax,%ax */
3281 bfd_put_8 (output_bfd, 0x66, contents + roff);
3282 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3283 }
3284 else
3285 {
3286 /* negl %eax */
3287 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3288 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3289 }
3290
3291 continue;
3292 }
3293 else
3294 BFD_ASSERT (false);
3295 break;
3296
3297 case R_386_TLS_LDM:
3298 if (! elf_i386_tls_transition (info, input_bfd,
3299 input_section, contents,
3300 symtab_hdr, sym_hashes,
3301 &r_type, GOT_UNKNOWN, rel,
3302 relend, h, r_symndx, true))
3303 return false;
3304
3305 if (r_type != R_386_TLS_LDM)
3306 {
3307 /* LD->LE transition. Change
3308 leal foo@tlsldm(%ebx) %eax
3309 call ___tls_get_addr@PLT
3310 into:
3311 movl %gs:0, %eax
3312 nop
3313 leal 0(%esi,1), %esi
3314 or change
3315 leal foo@tlsldm(%reg) %eax
3316 call *___tls_get_addr@GOT(%reg)
3317 which may be converted to
3318 addr32 call ___tls_get_addr
3319 into:
3320 movl %gs:0, %eax
3321 leal 0(%esi), %esi */
3322 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3323 if (*(contents + rel->r_offset + 4) == 0xff
3324 || *(contents + rel->r_offset + 4) == 0x67)
3325 memcpy (contents + rel->r_offset - 2,
3326 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3327 else
3328 memcpy (contents + rel->r_offset - 2,
3329 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3330 /* Skip R_386_PC32/R_386_PLT32. */
3331 rel++;
3332 wrel++;
3333 continue;
3334 }
3335
3336 if (htab->elf.sgot == NULL)
3337 abort ();
3338
3339 off = htab->tls_ld_or_ldm_got.offset;
3340 if (off & 1)
3341 off &= ~1;
3342 else
3343 {
3344 Elf_Internal_Rela outrel;
3345
3346 if (htab->elf.srelgot == NULL)
3347 abort ();
3348
3349 outrel.r_offset = (htab->elf.sgot->output_section->vma
3350 + htab->elf.sgot->output_offset + off);
3351
3352 bfd_put_32 (output_bfd, 0,
3353 htab->elf.sgot->contents + off);
3354 bfd_put_32 (output_bfd, 0,
3355 htab->elf.sgot->contents + off + 4);
3356 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3357 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3358 htab->tls_ld_or_ldm_got.offset |= 1;
3359 }
3360 relocation = htab->elf.sgot->output_section->vma
3361 + htab->elf.sgot->output_offset + off
3362 - htab->elf.sgotplt->output_section->vma
3363 - htab->elf.sgotplt->output_offset;
3364 unresolved_reloc = false;
3365 break;
3366
3367 case R_386_TLS_LDO_32:
3368 if (!bfd_link_executable (info)
3369 || (input_section->flags & SEC_CODE) == 0)
3370 relocation -= _bfd_x86_elf_dtpoff_base (info);
3371 else
3372 /* When converting LDO to LE, we must negate. */
3373 relocation = -elf_i386_tpoff (info, relocation);
3374 break;
3375
3376 case R_386_TLS_LE_32:
3377 case R_386_TLS_LE:
3378 if (!bfd_link_executable (info))
3379 {
3380 Elf_Internal_Rela outrel;
3381 asection *sreloc;
3382
3383 outrel.r_offset = rel->r_offset
3384 + input_section->output_section->vma
3385 + input_section->output_offset;
3386 if (h != NULL && h->dynindx != -1)
3387 indx = h->dynindx;
3388 else
3389 indx = 0;
3390 if (r_type == R_386_TLS_LE_32)
3391 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3392 else
3393 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3394 sreloc = elf_section_data (input_section)->sreloc;
3395 if (sreloc == NULL)
3396 abort ();
3397 elf_append_rel (output_bfd, sreloc, &outrel);
3398 if (indx)
3399 continue;
3400 else if (r_type == R_386_TLS_LE_32)
3401 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3402 else
3403 relocation -= _bfd_x86_elf_dtpoff_base (info);
3404 }
3405 else if (r_type == R_386_TLS_LE_32)
3406 relocation = elf_i386_tpoff (info, relocation);
3407 else
3408 relocation = -elf_i386_tpoff (info, relocation);
3409 break;
3410
3411 default:
3412 break;
3413 }
3414
3415 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3416 because such sections are not SEC_ALLOC and thus ld.so will
3417 not process them. */
3418 if (unresolved_reloc
3419 && !((input_section->flags & SEC_DEBUGGING) != 0
3420 && h->def_dynamic)
3421 && _bfd_elf_section_offset (output_bfd, info, input_section,
3422 rel->r_offset) != (bfd_vma) -1)
3423 {
3424 _bfd_error_handler
3425 /* xgettext:c-format */
3426 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3427 input_bfd,
3428 input_section,
3429 (uint64_t) rel->r_offset,
3430 howto->name,
3431 h->root.root.string);
3432 return false;
3433 }
3434
3435 do_relocation:
3436 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3437 contents, rel->r_offset,
3438 relocation, 0);
3439
3440 check_relocation_error:
3441 if (r != bfd_reloc_ok)
3442 {
3443 const char *name;
3444
3445 if (h != NULL)
3446 name = h->root.root.string;
3447 else
3448 {
3449 name = bfd_elf_string_from_elf_section (input_bfd,
3450 symtab_hdr->sh_link,
3451 sym->st_name);
3452 if (name == NULL)
3453 return false;
3454 if (*name == '\0')
3455 name = bfd_section_name (sec);
3456 }
3457
3458 if (r == bfd_reloc_overflow)
3459 (*info->callbacks->reloc_overflow)
3460 (info, (h ? &h->root : NULL), name, howto->name,
3461 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3462 else
3463 {
3464 _bfd_error_handler
3465 /* xgettext:c-format */
3466 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3467 input_bfd, input_section,
3468 (uint64_t) rel->r_offset, name, (int) r);
3469 return false;
3470 }
3471 }
3472
3473 if (wrel != rel)
3474 *wrel = *rel;
3475 }
3476
3477 if (wrel != rel)
3478 {
3479 Elf_Internal_Shdr *rel_hdr;
3480 size_t deleted = rel - wrel;
3481
3482 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3483 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3484 if (rel_hdr->sh_size == 0)
3485 {
3486 /* It is too late to remove an empty reloc section. Leave
3487 one NONE reloc.
3488 ??? What is wrong with an empty section??? */
3489 rel_hdr->sh_size = rel_hdr->sh_entsize;
3490 deleted -= 1;
3491 }
3492 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3493 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3494 input_section->reloc_count -= deleted;
3495 }
3496
3497 return true;
3498 }
3499
3500 /* Finish up dynamic symbol handling. We set the contents of various
3501 dynamic sections here. */
3502
3503 static bool
3504 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3505 struct bfd_link_info *info,
3506 struct elf_link_hash_entry *h,
3507 Elf_Internal_Sym *sym)
3508 {
3509 struct elf_x86_link_hash_table *htab;
3510 unsigned plt_entry_size;
3511 struct elf_x86_link_hash_entry *eh;
3512 bool local_undefweak;
3513 bool use_plt_second;
3514
3515 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3516 if (htab == NULL)
3517 return false;
3518
3519 plt_entry_size = htab->plt.plt_entry_size;
3520
3521 /* Use the second PLT section only if there is .plt section. */
3522 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3523
3524 eh = (struct elf_x86_link_hash_entry *) h;
3525 if (eh->no_finish_dynamic_symbol)
3526 abort ();
3527
3528 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3529 resolved undefined weak symbols in executable so that their
3530 references have value 0 at run-time. */
3531 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3532
3533 if (h->plt.offset != (bfd_vma) -1)
3534 {
3535 bfd_vma plt_index, plt_offset;
3536 bfd_vma got_offset;
3537 Elf_Internal_Rela rel;
3538 bfd_byte *loc;
3539 asection *plt, *resolved_plt, *gotplt, *relplt;
3540
3541 /* When building a static executable, use .iplt, .igot.plt and
3542 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3543 if (htab->elf.splt != NULL)
3544 {
3545 plt = htab->elf.splt;
3546 gotplt = htab->elf.sgotplt;
3547 relplt = htab->elf.srelplt;
3548 }
3549 else
3550 {
3551 plt = htab->elf.iplt;
3552 gotplt = htab->elf.igotplt;
3553 relplt = htab->elf.irelplt;
3554 }
3555
3556 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3557
3558 /* Get the index in the procedure linkage table which
3559 corresponds to this symbol. This is the index of this symbol
3560 in all the symbols for which we are making plt entries. The
3561 first entry in the procedure linkage table is reserved.
3562
3563 Get the offset into the .got table of the entry that
3564 corresponds to this function. Each .got entry is 4 bytes.
3565 The first three are reserved.
3566
3567 For static executables, we don't reserve anything. */
3568
3569 if (plt == htab->elf.splt)
3570 {
3571 got_offset = (h->plt.offset / plt_entry_size
3572 - htab->plt.has_plt0);
3573 got_offset = (got_offset + 3) * 4;
3574 }
3575 else
3576 {
3577 got_offset = h->plt.offset / plt_entry_size;
3578 got_offset = got_offset * 4;
3579 }
3580
3581 /* Fill in the entry in the procedure linkage table and update
3582 the first slot. */
3583 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3584 plt_entry_size);
3585
3586 if (use_plt_second)
3587 {
3588 const bfd_byte *plt_entry;
3589 if (bfd_link_pic (info))
3590 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3591 else
3592 plt_entry = htab->non_lazy_plt->plt_entry;
3593 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3594 plt_entry, htab->non_lazy_plt->plt_entry_size);
3595
3596 resolved_plt = htab->plt_second;
3597 plt_offset = eh->plt_second.offset;
3598 }
3599 else
3600 {
3601 resolved_plt = plt;
3602 plt_offset = h->plt.offset;
3603 }
3604
3605 if (! bfd_link_pic (info))
3606 {
3607 bfd_put_32 (output_bfd,
3608 (gotplt->output_section->vma
3609 + gotplt->output_offset
3610 + got_offset),
3611 resolved_plt->contents + plt_offset
3612 + htab->plt.plt_got_offset);
3613
3614 if (htab->elf.target_os == is_vxworks)
3615 {
3616 int s, k, reloc_index;
3617
3618 /* Create the R_386_32 relocation referencing the GOT
3619 for this PLT entry. */
3620
3621 /* S: Current slot number (zero-based). */
3622 s = ((h->plt.offset - htab->plt.plt_entry_size)
3623 / htab->plt.plt_entry_size);
3624 /* K: Number of relocations for PLTResolve. */
3625 if (bfd_link_pic (info))
3626 k = PLTRESOLVE_RELOCS_SHLIB;
3627 else
3628 k = PLTRESOLVE_RELOCS;
3629 /* Skip the PLTresolve relocations, and the relocations for
3630 the other PLT slots. */
3631 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3632 loc = (htab->srelplt2->contents + reloc_index
3633 * sizeof (Elf32_External_Rel));
3634
3635 rel.r_offset = (plt->output_section->vma
3636 + plt->output_offset
3637 + h->plt.offset + 2),
3638 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3639 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3640
3641 /* Create the R_386_32 relocation referencing the beginning of
3642 the PLT for this GOT entry. */
3643 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3644 + htab->elf.sgotplt->output_offset
3645 + got_offset);
3646 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3647 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3648 loc + sizeof (Elf32_External_Rel));
3649 }
3650 }
3651 else
3652 {
3653 bfd_put_32 (output_bfd, got_offset,
3654 resolved_plt->contents + plt_offset
3655 + htab->plt.plt_got_offset);
3656 }
3657
3658 /* Fill in the entry in the global offset table. Leave the entry
3659 as zero for undefined weak symbol in PIE. No PLT relocation
3660 against undefined weak symbol in PIE. */
3661 if (!local_undefweak)
3662 {
3663 if (htab->plt.has_plt0)
3664 bfd_put_32 (output_bfd,
3665 (plt->output_section->vma
3666 + plt->output_offset
3667 + h->plt.offset
3668 + htab->lazy_plt->plt_lazy_offset),
3669 gotplt->contents + got_offset);
3670
3671 /* Fill in the entry in the .rel.plt section. */
3672 rel.r_offset = (gotplt->output_section->vma
3673 + gotplt->output_offset
3674 + got_offset);
3675 if (PLT_LOCAL_IFUNC_P (info, h))
3676 {
3677 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3678 h->root.root.string,
3679 h->root.u.def.section->owner);
3680
3681 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3682 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3683 in the .got.plt section. */
3684 bfd_put_32 (output_bfd,
3685 (h->root.u.def.value
3686 + h->root.u.def.section->output_section->vma
3687 + h->root.u.def.section->output_offset),
3688 gotplt->contents + got_offset);
3689 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3690
3691 if (htab->params->report_relative_reloc)
3692 _bfd_x86_elf_link_report_relative_reloc
3693 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3694
3695 /* R_386_IRELATIVE comes last. */
3696 plt_index = htab->next_irelative_index--;
3697 }
3698 else
3699 {
3700 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3701 plt_index = htab->next_jump_slot_index++;
3702 }
3703
3704 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3705 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3706
3707 /* Don't fill the second and third slots in PLT entry for
3708 static executables nor without PLT0. */
3709 if (plt == htab->elf.splt && htab->plt.has_plt0)
3710 {
3711 bfd_put_32 (output_bfd,
3712 plt_index * sizeof (Elf32_External_Rel),
3713 plt->contents + h->plt.offset
3714 + htab->lazy_plt->plt_reloc_offset);
3715 bfd_put_32 (output_bfd,
3716 - (h->plt.offset
3717 + htab->lazy_plt->plt_plt_offset + 4),
3718 (plt->contents + h->plt.offset
3719 + htab->lazy_plt->plt_plt_offset));
3720 }
3721 }
3722 }
3723 else if (eh->plt_got.offset != (bfd_vma) -1)
3724 {
3725 bfd_vma got_offset, plt_offset;
3726 asection *plt, *got, *gotplt;
3727 const bfd_byte *got_plt_entry;
3728
3729 /* Set the entry in the GOT procedure linkage table. */
3730 plt = htab->plt_got;
3731 got = htab->elf.sgot;
3732 gotplt = htab->elf.sgotplt;
3733 got_offset = h->got.offset;
3734
3735 if (got_offset == (bfd_vma) -1
3736 || plt == NULL
3737 || got == NULL
3738 || gotplt == NULL)
3739 abort ();
3740
3741 /* Fill in the entry in the GOT procedure linkage table. */
3742 if (! bfd_link_pic (info))
3743 {
3744 got_plt_entry = htab->non_lazy_plt->plt_entry;
3745 got_offset += got->output_section->vma + got->output_offset;
3746 }
3747 else
3748 {
3749 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3750 got_offset += (got->output_section->vma
3751 + got->output_offset
3752 - gotplt->output_section->vma
3753 - gotplt->output_offset);
3754 }
3755
3756 plt_offset = eh->plt_got.offset;
3757 memcpy (plt->contents + plt_offset, got_plt_entry,
3758 htab->non_lazy_plt->plt_entry_size);
3759 bfd_put_32 (output_bfd, got_offset,
3760 (plt->contents + plt_offset
3761 + htab->non_lazy_plt->plt_got_offset));
3762 }
3763
3764 if (!local_undefweak
3765 && !h->def_regular
3766 && (h->plt.offset != (bfd_vma) -1
3767 || eh->plt_got.offset != (bfd_vma) -1))
3768 {
3769 /* Mark the symbol as undefined, rather than as defined in
3770 the .plt section. Leave the value if there were any
3771 relocations where pointer equality matters (this is a clue
3772 for the dynamic linker, to make function pointer
3773 comparisons work between an application and shared
3774 library), otherwise set it to zero. If a function is only
3775 called from a binary, there is no need to slow down
3776 shared libraries because of that. */
3777 sym->st_shndx = SHN_UNDEF;
3778 if (!h->pointer_equality_needed)
3779 sym->st_value = 0;
3780 }
3781
3782 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3783
3784 /* Don't generate dynamic GOT relocation against undefined weak
3785 symbol in executable. */
3786 if (h->got.offset != (bfd_vma) -1
3787 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3788 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3789 && !local_undefweak)
3790 {
3791 Elf_Internal_Rela rel;
3792 asection *relgot = htab->elf.srelgot;
3793 const char *relative_reloc_name = NULL;
3794
3795 /* This symbol has an entry in the global offset table. Set it
3796 up. */
3797
3798 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3799 abort ();
3800
3801 rel.r_offset = (htab->elf.sgot->output_section->vma
3802 + htab->elf.sgot->output_offset
3803 + (h->got.offset & ~(bfd_vma) 1));
3804
3805 /* If this is a static link, or it is a -Bsymbolic link and the
3806 symbol is defined locally or was forced to be local because
3807 of a version file, we just want to emit a RELATIVE reloc.
3808 The entry in the global offset table will already have been
3809 initialized in the relocate_section function. */
3810 if (h->def_regular
3811 && h->type == STT_GNU_IFUNC)
3812 {
3813 if (h->plt.offset == (bfd_vma) -1)
3814 {
3815 /* STT_GNU_IFUNC is referenced without PLT. */
3816 if (htab->elf.splt == NULL)
3817 {
3818 /* use .rel[a].iplt section to store .got relocations
3819 in static executable. */
3820 relgot = htab->elf.irelplt;
3821 }
3822 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3823 {
3824 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3825 h->root.root.string,
3826 h->root.u.def.section->owner);
3827
3828 bfd_put_32 (output_bfd,
3829 (h->root.u.def.value
3830 + h->root.u.def.section->output_section->vma
3831 + h->root.u.def.section->output_offset),
3832 htab->elf.sgot->contents + h->got.offset);
3833 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3834 relative_reloc_name = "R_386_IRELATIVE";
3835 }
3836 else
3837 goto do_glob_dat;
3838 }
3839 else if (bfd_link_pic (info))
3840 {
3841 /* Generate R_386_GLOB_DAT. */
3842 goto do_glob_dat;
3843 }
3844 else
3845 {
3846 asection *plt;
3847 bfd_vma plt_offset;
3848
3849 if (!h->pointer_equality_needed)
3850 abort ();
3851
3852 /* For non-shared object, we can't use .got.plt, which
3853 contains the real function addres if we need pointer
3854 equality. We load the GOT entry with the PLT entry. */
3855 if (htab->plt_second != NULL)
3856 {
3857 plt = htab->plt_second;
3858 plt_offset = eh->plt_second.offset;
3859 }
3860 else
3861 {
3862 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3863 plt_offset = h->plt.offset;
3864 }
3865 bfd_put_32 (output_bfd,
3866 (plt->output_section->vma
3867 + plt->output_offset + plt_offset),
3868 htab->elf.sgot->contents + h->got.offset);
3869 return true;
3870 }
3871 }
3872 else if (bfd_link_pic (info)
3873 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3874 {
3875 BFD_ASSERT((h->got.offset & 1) != 0);
3876 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3877 relative_reloc_name = "R_386_RELATIVE";
3878 }
3879 else
3880 {
3881 BFD_ASSERT((h->got.offset & 1) == 0);
3882 do_glob_dat:
3883 bfd_put_32 (output_bfd, (bfd_vma) 0,
3884 htab->elf.sgot->contents + h->got.offset);
3885 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3886 }
3887
3888 if (relative_reloc_name != NULL
3889 && htab->params->report_relative_reloc)
3890 _bfd_x86_elf_link_report_relative_reloc
3891 (info, relgot, h, sym, relative_reloc_name, &rel);
3892
3893 elf_append_rel (output_bfd, relgot, &rel);
3894 }
3895
3896 if (h->needs_copy)
3897 {
3898 Elf_Internal_Rela rel;
3899 asection *s;
3900
3901 /* This symbol needs a copy reloc. Set it up. */
3902 VERIFY_COPY_RELOC (h, htab)
3903
3904 rel.r_offset = (h->root.u.def.value
3905 + h->root.u.def.section->output_section->vma
3906 + h->root.u.def.section->output_offset);
3907 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3908 if (h->root.u.def.section == htab->elf.sdynrelro)
3909 s = htab->elf.sreldynrelro;
3910 else
3911 s = htab->elf.srelbss;
3912 elf_append_rel (output_bfd, s, &rel);
3913 }
3914
3915 return true;
3916 }
3917
3918 /* Finish up local dynamic symbol handling. We set the contents of
3919 various dynamic sections here. */
3920
3921 static int
3922 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3923 {
3924 struct elf_link_hash_entry *h
3925 = (struct elf_link_hash_entry *) *slot;
3926 struct bfd_link_info *info
3927 = (struct bfd_link_info *) inf;
3928
3929 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3930 h, NULL);
3931 }
3932
3933 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3934 here since undefined weak symbol may not be dynamic and may not be
3935 called for elf_i386_finish_dynamic_symbol. */
3936
3937 static bool
3938 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3939 void *inf)
3940 {
3941 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3942 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3943
3944 if (h->root.type != bfd_link_hash_undefweak
3945 || h->dynindx != -1)
3946 return true;
3947
3948 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3949 info, h, NULL);
3950 }
3951
3952 /* Used to decide how to sort relocs in an optimal manner for the
3953 dynamic linker, before writing them out. */
3954
3955 static enum elf_reloc_type_class
3956 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3957 const asection *rel_sec ATTRIBUTE_UNUSED,
3958 const Elf_Internal_Rela *rela)
3959 {
3960 bfd *abfd = info->output_bfd;
3961 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3962 struct elf_link_hash_table *htab = elf_hash_table (info);
3963
3964 if (htab->dynsym != NULL
3965 && htab->dynsym->contents != NULL)
3966 {
3967 /* Check relocation against STT_GNU_IFUNC symbol if there are
3968 dynamic symbols. */
3969 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3970 if (r_symndx != STN_UNDEF)
3971 {
3972 Elf_Internal_Sym sym;
3973 if (!bed->s->swap_symbol_in (abfd,
3974 (htab->dynsym->contents
3975 + r_symndx * sizeof (Elf32_External_Sym)),
3976 0, &sym))
3977 abort ();
3978
3979 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3980 return reloc_class_ifunc;
3981 }
3982 }
3983
3984 switch (ELF32_R_TYPE (rela->r_info))
3985 {
3986 case R_386_IRELATIVE:
3987 return reloc_class_ifunc;
3988 case R_386_RELATIVE:
3989 return reloc_class_relative;
3990 case R_386_JUMP_SLOT:
3991 return reloc_class_plt;
3992 case R_386_COPY:
3993 return reloc_class_copy;
3994 default:
3995 return reloc_class_normal;
3996 }
3997 }
3998
3999 /* Finish up the dynamic sections. */
4000
4001 static bool
4002 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4003 struct bfd_link_info *info)
4004 {
4005 struct elf_x86_link_hash_table *htab;
4006
4007 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4008 if (htab == NULL)
4009 return false;
4010
4011 if (!htab->elf.dynamic_sections_created)
4012 return true;
4013
4014 if (htab->elf.splt && htab->elf.splt->size > 0)
4015 {
4016 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4017 really seem like the right value. */
4018 elf_section_data (htab->elf.splt->output_section)
4019 ->this_hdr.sh_entsize = 4;
4020
4021 if (htab->plt.has_plt0)
4022 {
4023 /* Fill in the special first entry in the procedure linkage
4024 table. */
4025 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4026 htab->lazy_plt->plt0_entry_size);
4027 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4028 htab->plt0_pad_byte,
4029 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4030 if (!bfd_link_pic (info))
4031 {
4032 bfd_put_32 (output_bfd,
4033 (htab->elf.sgotplt->output_section->vma
4034 + htab->elf.sgotplt->output_offset
4035 + 4),
4036 htab->elf.splt->contents
4037 + htab->lazy_plt->plt0_got1_offset);
4038 bfd_put_32 (output_bfd,
4039 (htab->elf.sgotplt->output_section->vma
4040 + htab->elf.sgotplt->output_offset
4041 + 8),
4042 htab->elf.splt->contents
4043 + htab->lazy_plt->plt0_got2_offset);
4044
4045 if (htab->elf.target_os == is_vxworks)
4046 {
4047 Elf_Internal_Rela rel;
4048 int num_plts = (htab->elf.splt->size
4049 / htab->plt.plt_entry_size) - 1;
4050 unsigned char *p;
4051 asection *srelplt2 = htab->srelplt2;
4052
4053 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4054 + 4. On IA32 we use REL relocations so the
4055 addend goes in the PLT directly. */
4056 rel.r_offset = (htab->elf.splt->output_section->vma
4057 + htab->elf.splt->output_offset
4058 + htab->lazy_plt->plt0_got1_offset);
4059 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4060 R_386_32);
4061 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4062 srelplt2->contents);
4063 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4064 + 8. */
4065 rel.r_offset = (htab->elf.splt->output_section->vma
4066 + htab->elf.splt->output_offset
4067 + htab->lazy_plt->plt0_got2_offset);
4068 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4069 R_386_32);
4070 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4071 srelplt2->contents +
4072 sizeof (Elf32_External_Rel));
4073 /* Correct the .rel.plt.unloaded relocations. */
4074 p = srelplt2->contents;
4075 if (bfd_link_pic (info))
4076 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4077 else
4078 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4079
4080 for (; num_plts; num_plts--)
4081 {
4082 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4083 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4084 R_386_32);
4085 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4086 p += sizeof (Elf32_External_Rel);
4087
4088 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4089 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4090 R_386_32);
4091 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4092 p += sizeof (Elf32_External_Rel);
4093 }
4094 }
4095 }
4096 }
4097 }
4098
4099 /* Fill PLT entries for undefined weak symbols in PIE. */
4100 if (bfd_link_pie (info))
4101 bfd_hash_traverse (&info->hash->table,
4102 elf_i386_pie_finish_undefweak_symbol,
4103 info);
4104
4105 return true;
4106 }
4107
4108 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4109 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4110 It has to be done before elf_link_sort_relocs is called so that
4111 dynamic relocations are properly sorted. */
4112
4113 static bool
4114 elf_i386_output_arch_local_syms
4115 (bfd *output_bfd ATTRIBUTE_UNUSED,
4116 struct bfd_link_info *info,
4117 void *flaginfo ATTRIBUTE_UNUSED,
4118 int (*func) (void *, const char *,
4119 Elf_Internal_Sym *,
4120 asection *,
4121 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4122 {
4123 struct elf_x86_link_hash_table *htab
4124 = elf_x86_hash_table (info, I386_ELF_DATA);
4125 if (htab == NULL)
4126 return false;
4127
4128 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4129 htab_traverse (htab->loc_hash_table,
4130 elf_i386_finish_local_dynamic_symbol,
4131 info);
4132
4133 return true;
4134 }
4135
4136 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4137 dynamic relocations. */
4138
4139 static long
4140 elf_i386_get_synthetic_symtab (bfd *abfd,
4141 long symcount ATTRIBUTE_UNUSED,
4142 asymbol **syms ATTRIBUTE_UNUSED,
4143 long dynsymcount,
4144 asymbol **dynsyms,
4145 asymbol **ret)
4146 {
4147 long count, i, n;
4148 int j;
4149 bfd_byte *plt_contents;
4150 long relsize;
4151 const struct elf_x86_lazy_plt_layout *lazy_plt;
4152 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4153 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4154 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4155 asection *plt;
4156 bfd_vma got_addr;
4157 enum elf_x86_plt_type plt_type;
4158 struct elf_x86_plt plts[] =
4159 {
4160 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4161 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4162 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4163 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4164 };
4165
4166 *ret = NULL;
4167
4168 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4169 return 0;
4170
4171 if (dynsymcount <= 0)
4172 return 0;
4173
4174 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4175 if (relsize <= 0)
4176 return -1;
4177
4178 non_lazy_plt = NULL;
4179 /* Silence GCC 6. */
4180 lazy_plt = NULL;
4181 non_lazy_ibt_plt = NULL;
4182 lazy_ibt_plt = NULL;
4183 switch (get_elf_backend_data (abfd)->target_os)
4184 {
4185 case is_normal:
4186 case is_solaris:
4187 non_lazy_plt = &elf_i386_non_lazy_plt;
4188 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4189 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4190 /* Fall through */
4191 case is_vxworks:
4192 lazy_plt = &elf_i386_lazy_plt;
4193 break;
4194 default:
4195 abort ();
4196 }
4197
4198 got_addr = 0;
4199
4200 count = 0;
4201 for (j = 0; plts[j].name != NULL; j++)
4202 {
4203 plt = bfd_get_section_by_name (abfd, plts[j].name);
4204 if (plt == NULL || plt->size == 0)
4205 continue;
4206
4207 /* Get the PLT section contents. */
4208 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4209 if (plt_contents == NULL)
4210 break;
4211 if (!bfd_get_section_contents (abfd, (asection *) plt,
4212 plt_contents, 0, plt->size))
4213 {
4214 free (plt_contents);
4215 break;
4216 }
4217
4218 /* Check what kind of PLT it is. */
4219 plt_type = plt_unknown;
4220 if (plts[j].type == plt_unknown
4221 && (plt->size >= (lazy_plt->plt0_entry_size
4222 + lazy_plt->plt_entry_size)))
4223 {
4224 /* Match lazy PLT first. */
4225 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4226 lazy_plt->plt0_got1_offset) == 0)
4227 {
4228 /* The fist entry in the lazy IBT PLT is the same as the
4229 normal lazy PLT. */
4230 if (lazy_ibt_plt != NULL
4231 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4232 lazy_ibt_plt->plt_entry,
4233 lazy_ibt_plt->plt_got_offset) == 0))
4234 plt_type = plt_lazy | plt_second;
4235 else
4236 plt_type = plt_lazy;
4237 }
4238 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4239 lazy_plt->plt0_got1_offset) == 0)
4240 {
4241 /* The fist entry in the PIC lazy IBT PLT is the same as
4242 the normal PIC lazy PLT. */
4243 if (lazy_ibt_plt != NULL
4244 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4245 lazy_ibt_plt->pic_plt_entry,
4246 lazy_ibt_plt->plt_got_offset) == 0))
4247 plt_type = plt_lazy | plt_pic | plt_second;
4248 else
4249 plt_type = plt_lazy | plt_pic;
4250 }
4251 }
4252
4253 if (non_lazy_plt != NULL
4254 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4255 && plt->size >= non_lazy_plt->plt_entry_size)
4256 {
4257 /* Match non-lazy PLT. */
4258 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4259 non_lazy_plt->plt_got_offset) == 0)
4260 plt_type = plt_non_lazy;
4261 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4262 non_lazy_plt->plt_got_offset) == 0)
4263 plt_type = plt_pic;
4264 }
4265
4266 if ((non_lazy_ibt_plt != NULL)
4267 && (plt_type == plt_unknown || plt_type == plt_second)
4268 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4269 {
4270 if (memcmp (plt_contents,
4271 non_lazy_ibt_plt->plt_entry,
4272 non_lazy_ibt_plt->plt_got_offset) == 0)
4273 {
4274 /* Match IBT PLT. */
4275 plt_type = plt_second;
4276 non_lazy_plt = non_lazy_ibt_plt;
4277 }
4278 else if (memcmp (plt_contents,
4279 non_lazy_ibt_plt->pic_plt_entry,
4280 non_lazy_ibt_plt->plt_got_offset) == 0)
4281 {
4282 /* Match PIC IBT PLT. */
4283 plt_type = plt_second | plt_pic;
4284 non_lazy_plt = non_lazy_ibt_plt;
4285 }
4286 }
4287
4288 if (plt_type == plt_unknown)
4289 {
4290 free (plt_contents);
4291 continue;
4292 }
4293
4294 plts[j].sec = plt;
4295 plts[j].type = plt_type;
4296
4297 if ((plt_type & plt_lazy))
4298 {
4299 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4300 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4301 /* Skip PLT0 in lazy PLT. */
4302 i = 1;
4303 }
4304 else
4305 {
4306 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4307 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4308 i = 0;
4309 }
4310
4311 /* Skip lazy PLT when the second PLT is used. */
4312 if ((plt_type & (plt_lazy | plt_second))
4313 == (plt_lazy | plt_second))
4314 plts[j].count = 0;
4315 else
4316 {
4317 n = plt->size / plts[j].plt_entry_size;
4318 plts[j].count = n;
4319 count += n - i;
4320 }
4321
4322 plts[j].contents = plt_contents;
4323
4324 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4325 if ((plt_type & plt_pic))
4326 got_addr = (bfd_vma) -1;
4327 }
4328
4329 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4330 got_addr, plts, dynsyms,
4331 ret);
4332 }
4333
4334 /* Set up i386 GNU properties. Return the first relocatable ELF input
4335 with GNU properties if found. Otherwise, return NULL. */
4336
4337 static bfd *
4338 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4339 {
4340 struct elf_x86_init_table init_table;
4341
4342 switch (get_elf_backend_data (info->output_bfd)->target_os)
4343 {
4344 case is_normal:
4345 case is_solaris:
4346 init_table.plt0_pad_byte = 0x0;
4347 init_table.lazy_plt = &elf_i386_lazy_plt;
4348 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4349 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4350 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4351 break;
4352 case is_vxworks:
4353 init_table.plt0_pad_byte = 0x90;
4354 init_table.lazy_plt = &elf_i386_lazy_plt;
4355 init_table.non_lazy_plt = NULL;
4356 init_table.lazy_ibt_plt = NULL;
4357 init_table.non_lazy_ibt_plt = NULL;
4358 break;
4359 default:
4360 abort ();
4361 }
4362
4363 init_table.r_info = elf32_r_info;
4364 init_table.r_sym = elf32_r_sym;
4365
4366 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4367 }
4368
4369 #define TARGET_LITTLE_SYM i386_elf32_vec
4370 #define TARGET_LITTLE_NAME "elf32-i386"
4371 #define ELF_ARCH bfd_arch_i386
4372 #define ELF_TARGET_ID I386_ELF_DATA
4373 #define ELF_MACHINE_CODE EM_386
4374 #define ELF_MAXPAGESIZE 0x1000
4375
4376 #define elf_backend_can_gc_sections 1
4377 #define elf_backend_can_refcount 1
4378 #define elf_backend_want_got_plt 1
4379 #define elf_backend_plt_readonly 1
4380 #define elf_backend_want_plt_sym 0
4381 #define elf_backend_got_header_size 12
4382 #define elf_backend_plt_alignment 4
4383 #define elf_backend_dtrel_excludes_plt 1
4384 #define elf_backend_extern_protected_data 1
4385 #define elf_backend_caches_rawsize 1
4386 #define elf_backend_want_dynrelro 1
4387
4388 /* Support RELA for objdump of prelink objects. */
4389 #define elf_info_to_howto elf_i386_info_to_howto_rel
4390 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4391
4392 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4393 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4394 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4395 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4396
4397 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4398 #define elf_backend_check_relocs elf_i386_check_relocs
4399 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4400 #define elf_backend_fake_sections elf_i386_fake_sections
4401 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4402 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4403 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4404 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4405 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4406 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4407 #define elf_backend_relocate_section elf_i386_relocate_section
4408 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4409 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4410
4411 #define elf_backend_linux_prpsinfo32_ugid16 true
4412
4413 #define elf32_bed elf32_i386_bed
4414
4415 #include "elf32-target.h"
4416
4417 /* FreeBSD support. */
4418
4419 #undef TARGET_LITTLE_SYM
4420 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4421 #undef TARGET_LITTLE_NAME
4422 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4423 #undef ELF_OSABI
4424 #define ELF_OSABI ELFOSABI_FREEBSD
4425
4426 /* The kernel recognizes executables as valid only if they carry a
4427 "FreeBSD" label in the ELF header. So we put this label on all
4428 executables and (for simplicity) also all other object files. */
4429
4430 static bool
4431 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4432 {
4433 if (!_bfd_elf_init_file_header (abfd, info))
4434 return false;
4435
4436 #ifdef OLD_FREEBSD_ABI_LABEL
4437 {
4438 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4439 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4440 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4441 }
4442 #endif
4443 return true;
4444 }
4445
4446 #undef elf_backend_init_file_header
4447 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4448 #undef elf32_bed
4449 #define elf32_bed elf32_i386_fbsd_bed
4450
4451 #undef elf_backend_add_symbol_hook
4452
4453 #include "elf32-target.h"
4454
4455 #undef elf_backend_init_file_header
4456
4457 /* Solaris 2. */
4458
4459 #undef TARGET_LITTLE_SYM
4460 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4461 #undef TARGET_LITTLE_NAME
4462 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4463
4464 #undef ELF_TARGET_OS
4465 #define ELF_TARGET_OS is_solaris
4466
4467 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4468 objects won't be recognized. */
4469 #undef ELF_OSABI
4470
4471 #undef elf32_bed
4472 #define elf32_bed elf32_i386_sol2_bed
4473
4474 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4475 boundary. */
4476 #undef elf_backend_static_tls_alignment
4477 #define elf_backend_static_tls_alignment 8
4478
4479 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4480
4481 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4482 File, p.63. */
4483 #undef elf_backend_want_plt_sym
4484 #define elf_backend_want_plt_sym 1
4485
4486 #undef elf_backend_strtab_flags
4487 #define elf_backend_strtab_flags SHF_STRINGS
4488
4489 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4490 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4491 FALSE otherwise. ISECTION is the best guess matching section from the
4492 input bfd IBFD, but it might be NULL. */
4493
4494 static bool
4495 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4496 bfd *obfd ATTRIBUTE_UNUSED,
4497 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4498 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4499 {
4500 /* PR 19938: FIXME: Need to add code for setting the sh_info
4501 and sh_link fields of Solaris specific section types. */
4502 return false;
4503
4504 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4505 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4506
4507 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4508
4509 The following values should be set:
4510
4511 Type Link Info
4512 -----------------------------------------------------------------------------
4513 SHT_SUNW_ancillary The section header index of 0
4514 [0x6fffffee] the associated string table.
4515
4516 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4517 [0x6ffffff0] the associated symbol table. section header index of
4518 the associated
4519 SHT_SUNW_capchain table,
4520 otherwise 0.
4521
4522 SHT_SUNW_symsort The section header index of 0
4523 [0x6ffffff1] the associated symbol table.
4524
4525 SHT_SUNW_tlssort The section header index of 0
4526 [0x6ffffff2] the associated symbol table.
4527
4528 SHT_SUNW_LDYNSYM The section header index of One greater than the
4529 [0x6ffffff3] the associated string table. symbol table index of the
4530 This index is the same string last local symbol,
4531 table used by the SHT_DYNSYM STB_LOCAL. Since
4532 section. SHT_SUNW_LDYNSYM only
4533 contains local symbols,
4534 sh_info is equivalent to
4535 the number of symbols in
4536 the table.
4537
4538 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4539 [0x6ffffff5] the section header index of to named strings, the
4540 the associated section header index of
4541 SHT_SUNW_capinfo table, the associated string
4542 otherwise 0. table, otherwise 0.
4543
4544 SHT_SUNW_move The section header index of 0
4545 [0x6ffffffa] the associated symbol table.
4546
4547 SHT_SUNW_COMDAT 0 0
4548 [0x6ffffffb]
4549
4550 SHT_SUNW_syminfo The section header index of The section header index
4551 [0x6ffffffc] the associated symbol table. of the associated
4552 .dynamic section.
4553
4554 SHT_SUNW_verdef The section header index of The number of version
4555 [0x6ffffffd] the associated string table. definitions within the
4556 section.
4557
4558 SHT_SUNW_verneed The section header index of The number of version
4559 [0x6ffffffe] the associated string table. dependencies within the
4560 section.
4561
4562 SHT_SUNW_versym The section header index of 0
4563 [0x6fffffff] the associated symbol table. */
4564 }
4565
4566 #undef elf_backend_copy_special_section_fields
4567 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4568
4569 #include "elf32-target.h"
4570
4571 /* Intel MCU support. */
4572
4573 static bool
4574 elf32_iamcu_elf_object_p (bfd *abfd)
4575 {
4576 /* Set the right machine number for an IAMCU elf32 file. */
4577 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4578 return true;
4579 }
4580
4581 #undef TARGET_LITTLE_SYM
4582 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4583 #undef TARGET_LITTLE_NAME
4584 #define TARGET_LITTLE_NAME "elf32-iamcu"
4585 #undef ELF_ARCH
4586 #define ELF_ARCH bfd_arch_iamcu
4587
4588 #undef ELF_MACHINE_CODE
4589 #define ELF_MACHINE_CODE EM_IAMCU
4590
4591 #undef ELF_TARGET_OS
4592 #undef ELF_OSABI
4593
4594 #undef elf32_bed
4595 #define elf32_bed elf32_iamcu_bed
4596
4597 #undef elf_backend_object_p
4598 #define elf_backend_object_p elf32_iamcu_elf_object_p
4599
4600 #undef elf_backend_static_tls_alignment
4601
4602 #undef elf_backend_want_plt_sym
4603 #define elf_backend_want_plt_sym 0
4604
4605 #undef elf_backend_strtab_flags
4606 #undef elf_backend_copy_special_section_fields
4607
4608 #include "elf32-target.h"
4609
4610 /* Restore defaults. */
4611 #undef ELF_ARCH
4612 #define ELF_ARCH bfd_arch_i386
4613 #undef ELF_MACHINE_CODE
4614 #define ELF_MACHINE_CODE EM_386
4615 #undef elf_backend_object_p
4616
4617 /* VxWorks support. */
4618
4619 #undef TARGET_LITTLE_SYM
4620 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4621 #undef TARGET_LITTLE_NAME
4622 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4623 #undef ELF_OSABI
4624 #undef ELF_MAXPAGESIZE
4625 #define ELF_MAXPAGESIZE 0x1000
4626 #undef elf_backend_plt_alignment
4627 #define elf_backend_plt_alignment 4
4628
4629 #undef ELF_TARGET_OS
4630 #define ELF_TARGET_OS is_vxworks
4631
4632 #undef elf_backend_relocs_compatible
4633 #undef elf_backend_add_symbol_hook
4634 #define elf_backend_add_symbol_hook \
4635 elf_vxworks_add_symbol_hook
4636 #undef elf_backend_link_output_symbol_hook
4637 #define elf_backend_link_output_symbol_hook \
4638 elf_vxworks_link_output_symbol_hook
4639 #undef elf_backend_emit_relocs
4640 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4641 #undef elf_backend_final_write_processing
4642 #define elf_backend_final_write_processing \
4643 elf_vxworks_final_write_processing
4644 #undef elf_backend_static_tls_alignment
4645
4646 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4647 define it. */
4648 #undef elf_backend_want_plt_sym
4649 #define elf_backend_want_plt_sym 1
4650
4651 #undef elf32_bed
4652 #define elf32_bed elf32_i386_vxworks_bed
4653
4654 #include "elf32-target.h"
GDB Binutils - Deliverables
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