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[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 if (!elf_has_indirect_extern_access (sec->owner))
1819 eh->non_got_ref_without_indirect_extern_access = 1;
1820
1821 /* We may need a .plt entry if the symbol is a function
1822 defined in a shared lib or is a function referenced
1823 from the code or read-only section. */
1824 if (!h->def_regular
1825 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1826 h->plt.refcount = 1;
1827 }
1828 }
1829
1830 size_reloc = false;
1831 do_size:
1832 if (!no_dynreloc
1833 && NEED_DYNAMIC_RELOCATION_P (info, false, h, sec, r_type,
1834 R_386_32))
1835 {
1836 struct elf_dyn_relocs *p;
1837 struct elf_dyn_relocs **head;
1838
1839 /* We must copy these reloc types into the output file.
1840 Create a reloc section in dynobj and make room for
1841 this reloc. */
1842 if (sreloc == NULL)
1843 {
1844 sreloc = _bfd_elf_make_dynamic_reloc_section
1845 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ false);
1846
1847 if (sreloc == NULL)
1848 goto error_return;
1849 }
1850
1851 /* If this is a global symbol, we count the number of
1852 relocations we need for this symbol. */
1853 if (h != NULL)
1854 {
1855 head = &h->dyn_relocs;
1856 }
1857 else
1858 {
1859 /* Track dynamic relocs needed for local syms too.
1860 We really need local syms available to do this
1861 easily. Oh well. */
1862 void **vpp;
1863 asection *s;
1864
1865 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1866 abfd, r_symndx);
1867 if (isym == NULL)
1868 goto error_return;
1869
1870 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1871 if (s == NULL)
1872 s = sec;
1873
1874 vpp = &elf_section_data (s)->local_dynrel;
1875 head = (struct elf_dyn_relocs **)vpp;
1876 }
1877
1878 p = *head;
1879 if (p == NULL || p->sec != sec)
1880 {
1881 size_t amt = sizeof *p;
1882 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1883 amt);
1884 if (p == NULL)
1885 goto error_return;
1886 p->next = *head;
1887 *head = p;
1888 p->sec = sec;
1889 p->count = 0;
1890 p->pc_count = 0;
1891 }
1892
1893 p->count += 1;
1894 /* Count size relocation as PC-relative relocation. */
1895 if (r_type == R_386_PC32 || size_reloc)
1896 p->pc_count += 1;
1897 }
1898 break;
1899
1900 /* This relocation describes the C++ object vtable hierarchy.
1901 Reconstruct it for later use during GC. */
1902 case R_386_GNU_VTINHERIT:
1903 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1904 goto error_return;
1905 break;
1906
1907 /* This relocation describes which C++ vtable entries are actually
1908 used. Record for later use during GC. */
1909 case R_386_GNU_VTENTRY:
1910 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1911 goto error_return;
1912 break;
1913
1914 default:
1915 break;
1916 }
1917 }
1918
1919 if (elf_section_data (sec)->this_hdr.contents != contents)
1920 {
1921 if (!converted && !_bfd_link_keep_memory (info))
1922 free (contents);
1923 else
1924 {
1925 /* Cache the section contents for elf_link_input_bfd if any
1926 load is converted or --no-keep-memory isn't used. */
1927 elf_section_data (sec)->this_hdr.contents = contents;
1928 info->cache_size += sec->size;
1929 }
1930 }
1931
1932 /* Cache relocations if any load is converted. */
1933 if (elf_section_data (sec)->relocs != relocs && converted)
1934 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1935
1936 return true;
1937
1938 error_return:
1939 if (elf_section_data (sec)->this_hdr.contents != contents)
1940 free (contents);
1941 sec->check_relocs_failed = 1;
1942 return false;
1943 }
1944
1945 /* Set the correct type for an x86 ELF section. We do this by the
1946 section name, which is a hack, but ought to work. */
1947
1948 static bool
1949 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1950 Elf_Internal_Shdr *hdr,
1951 asection *sec)
1952 {
1953 const char *name;
1954
1955 name = bfd_section_name (sec);
1956
1957 /* This is an ugly, but unfortunately necessary hack that is
1958 needed when producing EFI binaries on x86. It tells
1959 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1960 containing ELF relocation info. We need this hack in order to
1961 be able to generate ELF binaries that can be translated into
1962 EFI applications (which are essentially COFF objects). Those
1963 files contain a COFF ".reloc" section inside an ELFNN object,
1964 which would normally cause BFD to segfault because it would
1965 attempt to interpret this section as containing relocation
1966 entries for section "oc". With this hack enabled, ".reloc"
1967 will be treated as a normal data section, which will avoid the
1968 segfault. However, you won't be able to create an ELFNN binary
1969 with a section named "oc" that needs relocations, but that's
1970 the kind of ugly side-effects you get when detecting section
1971 types based on their names... In practice, this limitation is
1972 unlikely to bite. */
1973 if (strcmp (name, ".reloc") == 0)
1974 hdr->sh_type = SHT_PROGBITS;
1975
1976 return true;
1977 }
1978
1979 /* Return the relocation value for @tpoff relocation
1980 if STT_TLS virtual address is ADDRESS. */
1981
1982 static bfd_vma
1983 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1984 {
1985 struct elf_link_hash_table *htab = elf_hash_table (info);
1986 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1987 bfd_vma static_tls_size;
1988
1989 /* If tls_sec is NULL, we should have signalled an error already. */
1990 if (htab->tls_sec == NULL)
1991 return 0;
1992
1993 /* Consider special static TLS alignment requirements. */
1994 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1995 return static_tls_size + htab->tls_sec->vma - address;
1996 }
1997
1998 /* Relocate an i386 ELF section. */
1999
2000 static int
2001 elf_i386_relocate_section (bfd *output_bfd,
2002 struct bfd_link_info *info,
2003 bfd *input_bfd,
2004 asection *input_section,
2005 bfd_byte *contents,
2006 Elf_Internal_Rela *relocs,
2007 Elf_Internal_Sym *local_syms,
2008 asection **local_sections)
2009 {
2010 struct elf_x86_link_hash_table *htab;
2011 Elf_Internal_Shdr *symtab_hdr;
2012 struct elf_link_hash_entry **sym_hashes;
2013 bfd_vma *local_got_offsets;
2014 bfd_vma *local_tlsdesc_gotents;
2015 Elf_Internal_Rela *rel;
2016 Elf_Internal_Rela *wrel;
2017 Elf_Internal_Rela *relend;
2018 bool is_vxworks_tls;
2019 unsigned plt_entry_size;
2020
2021 /* Skip if check_relocs failed. */
2022 if (input_section->check_relocs_failed)
2023 return false;
2024
2025 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2026 if (htab == NULL)
2027 return false;
2028
2029 if (!is_x86_elf (input_bfd, htab))
2030 {
2031 bfd_set_error (bfd_error_wrong_format);
2032 return false;
2033 }
2034
2035 symtab_hdr = &elf_symtab_hdr (input_bfd);
2036 sym_hashes = elf_sym_hashes (input_bfd);
2037 local_got_offsets = elf_local_got_offsets (input_bfd);
2038 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2039 /* We have to handle relocations in vxworks .tls_vars sections
2040 specially, because the dynamic loader is 'weird'. */
2041 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2042 && bfd_link_pic (info)
2043 && !strcmp (input_section->output_section->name,
2044 ".tls_vars"));
2045
2046 _bfd_x86_elf_set_tls_module_base (info);
2047
2048 plt_entry_size = htab->plt.plt_entry_size;
2049
2050 rel = wrel = relocs;
2051 relend = relocs + input_section->reloc_count;
2052 for (; rel < relend; wrel++, rel++)
2053 {
2054 unsigned int r_type, r_type_tls;
2055 reloc_howto_type *howto;
2056 unsigned long r_symndx;
2057 struct elf_link_hash_entry *h;
2058 struct elf_x86_link_hash_entry *eh;
2059 Elf_Internal_Sym *sym;
2060 asection *sec;
2061 bfd_vma off, offplt, plt_offset;
2062 bfd_vma relocation;
2063 bool unresolved_reloc;
2064 bfd_reloc_status_type r;
2065 unsigned int indx;
2066 int tls_type;
2067 bfd_vma st_size;
2068 asection *resolved_plt;
2069 bool resolved_to_zero;
2070 bool relative_reloc;
2071
2072 r_type = ELF32_R_TYPE (rel->r_info);
2073 if (r_type == R_386_GNU_VTINHERIT
2074 || r_type == R_386_GNU_VTENTRY)
2075 {
2076 if (wrel != rel)
2077 *wrel = *rel;
2078 continue;
2079 }
2080
2081 howto = elf_i386_rtype_to_howto (r_type);
2082 if (howto == NULL)
2083 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2084
2085 r_symndx = ELF32_R_SYM (rel->r_info);
2086 h = NULL;
2087 sym = NULL;
2088 sec = NULL;
2089 unresolved_reloc = false;
2090 if (r_symndx < symtab_hdr->sh_info)
2091 {
2092 sym = local_syms + r_symndx;
2093 sec = local_sections[r_symndx];
2094 relocation = (sec->output_section->vma
2095 + sec->output_offset
2096 + sym->st_value);
2097 st_size = sym->st_size;
2098
2099 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2100 && ((sec->flags & SEC_MERGE) != 0
2101 || (bfd_link_relocatable (info)
2102 && sec->output_offset != 0)))
2103 {
2104 bfd_vma addend;
2105 bfd_byte *where = contents + rel->r_offset;
2106
2107 switch (howto->size)
2108 {
2109 case 0:
2110 addend = bfd_get_8 (input_bfd, where);
2111 if (howto->pc_relative)
2112 {
2113 addend = (addend ^ 0x80) - 0x80;
2114 addend += 1;
2115 }
2116 break;
2117 case 1:
2118 addend = bfd_get_16 (input_bfd, where);
2119 if (howto->pc_relative)
2120 {
2121 addend = (addend ^ 0x8000) - 0x8000;
2122 addend += 2;
2123 }
2124 break;
2125 case 2:
2126 addend = bfd_get_32 (input_bfd, where);
2127 if (howto->pc_relative)
2128 {
2129 addend = (addend ^ 0x80000000) - 0x80000000;
2130 addend += 4;
2131 }
2132 break;
2133 default:
2134 abort ();
2135 }
2136
2137 if (bfd_link_relocatable (info))
2138 addend += sec->output_offset;
2139 else
2140 {
2141 asection *msec = sec;
2142 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2143 addend);
2144 addend -= relocation;
2145 addend += msec->output_section->vma + msec->output_offset;
2146 }
2147
2148 switch (howto->size)
2149 {
2150 case 0:
2151 /* FIXME: overflow checks. */
2152 if (howto->pc_relative)
2153 addend -= 1;
2154 bfd_put_8 (input_bfd, addend, where);
2155 break;
2156 case 1:
2157 if (howto->pc_relative)
2158 addend -= 2;
2159 bfd_put_16 (input_bfd, addend, where);
2160 break;
2161 case 2:
2162 if (howto->pc_relative)
2163 addend -= 4;
2164 bfd_put_32 (input_bfd, addend, where);
2165 break;
2166 }
2167 }
2168 else if (!bfd_link_relocatable (info)
2169 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2170 {
2171 /* Relocate against local STT_GNU_IFUNC symbol. */
2172 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2173 false);
2174 if (h == NULL)
2175 abort ();
2176
2177 /* Set STT_GNU_IFUNC symbol value. */
2178 h->root.u.def.value = sym->st_value;
2179 h->root.u.def.section = sec;
2180 }
2181 }
2182 else
2183 {
2184 bool warned ATTRIBUTE_UNUSED;
2185 bool ignored ATTRIBUTE_UNUSED;
2186
2187 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2188 r_symndx, symtab_hdr, sym_hashes,
2189 h, sec, relocation,
2190 unresolved_reloc, warned, ignored);
2191 st_size = h->size;
2192 }
2193
2194 if (sec != NULL && discarded_section (sec))
2195 {
2196 _bfd_clear_contents (howto, input_bfd, input_section,
2197 contents, rel->r_offset);
2198 wrel->r_offset = rel->r_offset;
2199 wrel->r_info = 0;
2200 wrel->r_addend = 0;
2201
2202 /* For ld -r, remove relocations in debug sections against
2203 sections defined in discarded sections. Not done for
2204 eh_frame editing code expects to be present. */
2205 if (bfd_link_relocatable (info)
2206 && (input_section->flags & SEC_DEBUGGING))
2207 wrel--;
2208
2209 continue;
2210 }
2211
2212 if (bfd_link_relocatable (info))
2213 {
2214 if (wrel != rel)
2215 *wrel = *rel;
2216 continue;
2217 }
2218
2219 eh = (struct elf_x86_link_hash_entry *) h;
2220
2221 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2222 it here if it is defined in a non-shared object. */
2223 if (h != NULL
2224 && h->type == STT_GNU_IFUNC
2225 && h->def_regular)
2226 {
2227 asection *gotplt, *base_got;
2228 bfd_vma plt_index;
2229 const char *name;
2230
2231 if ((input_section->flags & SEC_ALLOC) == 0)
2232 {
2233 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2234 STT_GNU_IFUNC symbol as STT_FUNC. */
2235 if (elf_section_type (input_section) == SHT_NOTE)
2236 goto skip_ifunc;
2237 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2238 sections because such sections are not SEC_ALLOC and
2239 thus ld.so will not process them. */
2240 if ((input_section->flags & SEC_DEBUGGING) != 0)
2241 continue;
2242 abort ();
2243 }
2244
2245 /* STT_GNU_IFUNC symbol must go through PLT. */
2246 if (htab->elf.splt != NULL)
2247 {
2248 if (htab->plt_second != NULL)
2249 {
2250 resolved_plt = htab->plt_second;
2251 plt_offset = eh->plt_second.offset;
2252 }
2253 else
2254 {
2255 resolved_plt = htab->elf.splt;
2256 plt_offset = h->plt.offset;
2257 }
2258 gotplt = htab->elf.sgotplt;
2259 }
2260 else
2261 {
2262 resolved_plt = htab->elf.iplt;
2263 plt_offset = h->plt.offset;
2264 gotplt = htab->elf.igotplt;
2265 }
2266
2267 switch (r_type)
2268 {
2269 default:
2270 break;
2271
2272 case R_386_GOT32:
2273 case R_386_GOT32X:
2274 base_got = htab->elf.sgot;
2275 off = h->got.offset;
2276
2277 if (base_got == NULL)
2278 abort ();
2279
2280 if (off == (bfd_vma) -1)
2281 {
2282 /* We can't use h->got.offset here to save state, or
2283 even just remember the offset, as finish_dynamic_symbol
2284 would use that as offset into .got. */
2285
2286 if (h->plt.offset == (bfd_vma) -1)
2287 abort ();
2288
2289 if (htab->elf.splt != NULL)
2290 {
2291 plt_index = (h->plt.offset / plt_entry_size
2292 - htab->plt.has_plt0);
2293 off = (plt_index + 3) * 4;
2294 base_got = htab->elf.sgotplt;
2295 }
2296 else
2297 {
2298 plt_index = h->plt.offset / plt_entry_size;
2299 off = plt_index * 4;
2300 base_got = htab->elf.igotplt;
2301 }
2302
2303 if (h->dynindx == -1
2304 || h->forced_local
2305 || info->symbolic)
2306 {
2307 /* This references the local defitionion. We must
2308 initialize this entry in the global offset table.
2309 Since the offset must always be a multiple of 8,
2310 we use the least significant bit to record
2311 whether we have initialized it already.
2312
2313 When doing a dynamic link, we create a .rela.got
2314 relocation entry to initialize the value. This
2315 is done in the finish_dynamic_symbol routine. */
2316 if ((off & 1) != 0)
2317 off &= ~1;
2318 else
2319 {
2320 bfd_put_32 (output_bfd, relocation,
2321 base_got->contents + off);
2322 h->got.offset |= 1;
2323 }
2324 }
2325
2326 relocation = off;
2327 }
2328 else
2329 relocation = (base_got->output_section->vma
2330 + base_got->output_offset + off
2331 - gotplt->output_section->vma
2332 - gotplt->output_offset);
2333
2334 if (rel->r_offset > 1
2335 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2336 && *(contents + rel->r_offset - 2) != 0x8d)
2337 {
2338 if (bfd_link_pic (info))
2339 goto disallow_got32;
2340
2341 /* Add the GOT base if there is no base register. */
2342 relocation += (gotplt->output_section->vma
2343 + gotplt->output_offset);
2344 }
2345 else if (htab->elf.splt == NULL)
2346 {
2347 /* Adjust for static executables. */
2348 relocation += gotplt->output_offset;
2349 }
2350
2351 goto do_relocation;
2352 }
2353
2354 if (h->plt.offset == (bfd_vma) -1)
2355 {
2356 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2357 if (r_type == R_386_32
2358 && (input_section->flags & SEC_CODE) == 0)
2359 goto do_ifunc_pointer;
2360 goto bad_ifunc_reloc;
2361 }
2362
2363 relocation = (resolved_plt->output_section->vma
2364 + resolved_plt->output_offset + plt_offset);
2365
2366 switch (r_type)
2367 {
2368 default:
2369 bad_ifunc_reloc:
2370 if (h->root.root.string)
2371 name = h->root.root.string;
2372 else
2373 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2374 NULL);
2375 _bfd_error_handler
2376 /* xgettext:c-format */
2377 (_("%pB: relocation %s against STT_GNU_IFUNC "
2378 "symbol `%s' isn't supported"), input_bfd,
2379 howto->name, name);
2380 bfd_set_error (bfd_error_bad_value);
2381 return false;
2382
2383 case R_386_32:
2384 /* Generate dynamic relcoation only when there is a
2385 non-GOT reference in a shared object. */
2386 if ((bfd_link_pic (info) && h->non_got_ref)
2387 || h->plt.offset == (bfd_vma) -1)
2388 {
2389 Elf_Internal_Rela outrel;
2390 asection *sreloc;
2391 bfd_vma offset;
2392
2393 do_ifunc_pointer:
2394 /* Need a dynamic relocation to get the real function
2395 adddress. */
2396 offset = _bfd_elf_section_offset (output_bfd,
2397 info,
2398 input_section,
2399 rel->r_offset);
2400 if (offset == (bfd_vma) -1
2401 || offset == (bfd_vma) -2)
2402 abort ();
2403
2404 outrel.r_offset = (input_section->output_section->vma
2405 + input_section->output_offset
2406 + offset);
2407
2408 if (POINTER_LOCAL_IFUNC_P (info, h))
2409 {
2410 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2411 h->root.root.string,
2412 h->root.u.def.section->owner);
2413
2414 /* This symbol is resolved locally. */
2415 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2416
2417 if (htab->params->report_relative_reloc)
2418 _bfd_x86_elf_link_report_relative_reloc
2419 (info, input_section, h, sym,
2420 "R_386_IRELATIVE", &outrel);
2421
2422 bfd_put_32 (output_bfd,
2423 (h->root.u.def.value
2424 + h->root.u.def.section->output_section->vma
2425 + h->root.u.def.section->output_offset),
2426 contents + offset);
2427 }
2428 else
2429 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2430
2431 /* Dynamic relocations are stored in
2432 1. .rel.ifunc section in PIC object.
2433 2. .rel.got section in dynamic executable.
2434 3. .rel.iplt section in static executable. */
2435 if (bfd_link_pic (info))
2436 sreloc = htab->elf.irelifunc;
2437 else if (htab->elf.splt != NULL)
2438 sreloc = htab->elf.srelgot;
2439 else
2440 sreloc = htab->elf.irelplt;
2441 elf_append_rel (output_bfd, sreloc, &outrel);
2442
2443 /* If this reloc is against an external symbol, we
2444 do not want to fiddle with the addend. Otherwise,
2445 we need to include the symbol value so that it
2446 becomes an addend for the dynamic reloc. For an
2447 internal symbol, we have updated addend. */
2448 continue;
2449 }
2450 /* FALLTHROUGH */
2451 case R_386_PC32:
2452 case R_386_PLT32:
2453 goto do_relocation;
2454
2455 case R_386_GOTOFF:
2456 relocation -= (gotplt->output_section->vma
2457 + gotplt->output_offset);
2458 goto do_relocation;
2459 }
2460 }
2461
2462 skip_ifunc:
2463 resolved_to_zero = (eh != NULL
2464 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2465
2466 switch (r_type)
2467 {
2468 case R_386_GOT32X:
2469 case R_386_GOT32:
2470 /* Relocation is to the entry for this symbol in the global
2471 offset table. */
2472 if (htab->elf.sgot == NULL)
2473 abort ();
2474
2475 relative_reloc = false;
2476 if (h != NULL)
2477 {
2478 off = h->got.offset;
2479 if (RESOLVED_LOCALLY_P (info, h, htab))
2480 {
2481 /* We must initialize this entry in the global offset
2482 table. Since the offset must always be a multiple
2483 of 4, we use the least significant bit to record
2484 whether we have initialized it already.
2485
2486 When doing a dynamic link, we create a .rel.got
2487 relocation entry to initialize the value. This
2488 is done in the finish_dynamic_symbol routine. */
2489 if ((off & 1) != 0)
2490 off &= ~1;
2491 else
2492 {
2493 bfd_put_32 (output_bfd, relocation,
2494 htab->elf.sgot->contents + off);
2495 h->got.offset |= 1;
2496
2497 if (GENERATE_RELATIVE_RELOC_P (info, h))
2498 {
2499 /* PR ld/21402: If this symbol isn't dynamic
2500 in PIC, generate R_386_RELATIVE here. */
2501 eh->no_finish_dynamic_symbol = 1;
2502 relative_reloc = true;
2503 }
2504 }
2505 }
2506 else
2507 unresolved_reloc = false;
2508 }
2509 else
2510 {
2511 if (local_got_offsets == NULL)
2512 abort ();
2513
2514 off = local_got_offsets[r_symndx];
2515
2516 /* The offset must always be a multiple of 4. We use
2517 the least significant bit to record whether we have
2518 already generated the necessary reloc. */
2519 if ((off & 1) != 0)
2520 off &= ~1;
2521 else
2522 {
2523 bfd_put_32 (output_bfd, relocation,
2524 htab->elf.sgot->contents + off);
2525 local_got_offsets[r_symndx] |= 1;
2526
2527 if (bfd_link_pic (info))
2528 relative_reloc = true;
2529 }
2530 }
2531
2532 if (relative_reloc)
2533 {
2534 asection *s;
2535 Elf_Internal_Rela outrel;
2536
2537 s = htab->elf.srelgot;
2538 if (s == NULL)
2539 abort ();
2540
2541 outrel.r_offset = (htab->elf.sgot->output_section->vma
2542 + htab->elf.sgot->output_offset
2543 + off);
2544 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2545
2546 if (htab->params->report_relative_reloc)
2547 _bfd_x86_elf_link_report_relative_reloc
2548 (info, input_section, h, sym, "R_386_RELATIVE",
2549 &outrel);
2550
2551 elf_append_rel (output_bfd, s, &outrel);
2552 }
2553
2554 if (off >= (bfd_vma) -2)
2555 abort ();
2556
2557 relocation = (htab->elf.sgot->output_section->vma
2558 + htab->elf.sgot->output_offset + off);
2559 if (rel->r_offset > 1
2560 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2561 && *(contents + rel->r_offset - 2) != 0x8d)
2562 {
2563 if (bfd_link_pic (info))
2564 {
2565 /* For PIC, disallow R_386_GOT32 without a base
2566 register, except for "lea foo@GOT, %reg", since
2567 we don't know what the GOT base is. */
2568 const char *name;
2569
2570 disallow_got32:
2571 if (h == NULL || h->root.root.string == NULL)
2572 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2573 NULL);
2574 else
2575 name = h->root.root.string;
2576
2577 _bfd_error_handler
2578 /* xgettext:c-format */
2579 (_("%pB: direct GOT relocation %s against `%s'"
2580 " without base register can not be used"
2581 " when making a shared object"),
2582 input_bfd, howto->name, name);
2583 bfd_set_error (bfd_error_bad_value);
2584 return false;
2585 }
2586 }
2587 else
2588 {
2589 /* Subtract the .got.plt section address only with a base
2590 register. */
2591 relocation -= (htab->elf.sgotplt->output_section->vma
2592 + htab->elf.sgotplt->output_offset);
2593 }
2594
2595 break;
2596
2597 case R_386_GOTOFF:
2598 /* Relocation is relative to the start of the global offset
2599 table. */
2600
2601 /* Check to make sure it isn't a protected function or data
2602 symbol for shared library since it may not be local when
2603 used as function address or with copy relocation. We also
2604 need to make sure that a symbol is referenced locally. */
2605 if (!bfd_link_executable (info) && h)
2606 {
2607 if (!h->def_regular)
2608 {
2609 const char *v;
2610
2611 switch (ELF_ST_VISIBILITY (h->other))
2612 {
2613 case STV_HIDDEN:
2614 v = _("hidden symbol");
2615 break;
2616 case STV_INTERNAL:
2617 v = _("internal symbol");
2618 break;
2619 case STV_PROTECTED:
2620 v = _("protected symbol");
2621 break;
2622 default:
2623 v = _("symbol");
2624 break;
2625 }
2626
2627 _bfd_error_handler
2628 /* xgettext:c-format */
2629 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2630 " `%s' can not be used when making a shared object"),
2631 input_bfd, v, h->root.root.string);
2632 bfd_set_error (bfd_error_bad_value);
2633 return false;
2634 }
2635 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2636 && (h->type == STT_FUNC
2637 || h->type == STT_OBJECT)
2638 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2639 {
2640 _bfd_error_handler
2641 /* xgettext:c-format */
2642 (_("%pB: relocation R_386_GOTOFF against protected %s"
2643 " `%s' can not be used when making a shared object"),
2644 input_bfd,
2645 h->type == STT_FUNC ? "function" : "data",
2646 h->root.root.string);
2647 bfd_set_error (bfd_error_bad_value);
2648 return false;
2649 }
2650 }
2651
2652 /* Note that sgot is not involved in this
2653 calculation. We always want the start of .got.plt. If we
2654 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2655 permitted by the ABI, we might have to change this
2656 calculation. */
2657 relocation -= htab->elf.sgotplt->output_section->vma
2658 + htab->elf.sgotplt->output_offset;
2659 break;
2660
2661 case R_386_GOTPC:
2662 /* Use global offset table as symbol value. */
2663 relocation = htab->elf.sgotplt->output_section->vma
2664 + htab->elf.sgotplt->output_offset;
2665 unresolved_reloc = false;
2666 break;
2667
2668 case R_386_PLT32:
2669 /* Relocation is to the entry for this symbol in the
2670 procedure linkage table. */
2671
2672 /* Resolve a PLT32 reloc against a local symbol directly,
2673 without using the procedure linkage table. */
2674 if (h == NULL)
2675 break;
2676
2677 if ((h->plt.offset == (bfd_vma) -1
2678 && eh->plt_got.offset == (bfd_vma) -1)
2679 || htab->elf.splt == NULL)
2680 {
2681 /* We didn't make a PLT entry for this symbol. This
2682 happens when statically linking PIC code, or when
2683 using -Bsymbolic. */
2684 break;
2685 }
2686
2687 if (h->plt.offset != (bfd_vma) -1)
2688 {
2689 if (htab->plt_second != NULL)
2690 {
2691 resolved_plt = htab->plt_second;
2692 plt_offset = eh->plt_second.offset;
2693 }
2694 else
2695 {
2696 resolved_plt = htab->elf.splt;
2697 plt_offset = h->plt.offset;
2698 }
2699 }
2700 else
2701 {
2702 resolved_plt = htab->plt_got;
2703 plt_offset = eh->plt_got.offset;
2704 }
2705
2706 relocation = (resolved_plt->output_section->vma
2707 + resolved_plt->output_offset
2708 + plt_offset);
2709 unresolved_reloc = false;
2710 break;
2711
2712 case R_386_SIZE32:
2713 /* Set to symbol size. */
2714 relocation = st_size;
2715 /* Fall through. */
2716
2717 case R_386_32:
2718 case R_386_PC32:
2719 if ((input_section->flags & SEC_ALLOC) == 0
2720 || is_vxworks_tls)
2721 break;
2722
2723 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type, sec,
2724 false, resolved_to_zero,
2725 (r_type == R_386_PC32)))
2726 {
2727 Elf_Internal_Rela outrel;
2728 bool skip, relocate;
2729 asection *sreloc;
2730
2731 /* When generating a shared object, these relocations
2732 are copied into the output file to be resolved at run
2733 time. */
2734
2735 skip = false;
2736 relocate = false;
2737
2738 outrel.r_offset =
2739 _bfd_elf_section_offset (output_bfd, info, input_section,
2740 rel->r_offset);
2741 if (outrel.r_offset == (bfd_vma) -1)
2742 skip = true;
2743 else if (outrel.r_offset == (bfd_vma) -2)
2744 skip = true, relocate = true;
2745 outrel.r_offset += (input_section->output_section->vma
2746 + input_section->output_offset);
2747
2748 if (skip)
2749 memset (&outrel, 0, sizeof outrel);
2750 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2751 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2752 else
2753 {
2754 /* This symbol is local, or marked to become local. */
2755 relocate = true;
2756 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2757
2758 if (htab->params->report_relative_reloc)
2759 _bfd_x86_elf_link_report_relative_reloc
2760 (info, input_section, h, sym, "R_386_RELATIVE",
2761 &outrel);
2762 }
2763
2764 sreloc = elf_section_data (input_section)->sreloc;
2765
2766 if (sreloc == NULL || sreloc->contents == NULL)
2767 {
2768 r = bfd_reloc_notsupported;
2769 goto check_relocation_error;
2770 }
2771
2772 elf_append_rel (output_bfd, sreloc, &outrel);
2773
2774 /* If this reloc is against an external symbol, we do
2775 not want to fiddle with the addend. Otherwise, we
2776 need to include the symbol value so that it becomes
2777 an addend for the dynamic reloc. */
2778 if (! relocate)
2779 continue;
2780 }
2781 break;
2782
2783 case R_386_TLS_IE:
2784 if (!bfd_link_executable (info))
2785 {
2786 Elf_Internal_Rela outrel;
2787 asection *sreloc;
2788
2789 outrel.r_offset = rel->r_offset
2790 + input_section->output_section->vma
2791 + input_section->output_offset;
2792 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2793
2794 if (htab->params->report_relative_reloc)
2795 _bfd_x86_elf_link_report_relative_reloc
2796 (info, input_section, h, sym, "R_386_RELATIVE",
2797 &outrel);
2798
2799 sreloc = elf_section_data (input_section)->sreloc;
2800 if (sreloc == NULL)
2801 abort ();
2802 elf_append_rel (output_bfd, sreloc, &outrel);
2803 }
2804 /* Fall through */
2805
2806 case R_386_TLS_GD:
2807 case R_386_TLS_GOTDESC:
2808 case R_386_TLS_DESC_CALL:
2809 case R_386_TLS_IE_32:
2810 case R_386_TLS_GOTIE:
2811 tls_type = GOT_UNKNOWN;
2812 if (h == NULL && local_got_offsets)
2813 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2814 else if (h != NULL)
2815 tls_type = elf_x86_hash_entry(h)->tls_type;
2816 if (tls_type == GOT_TLS_IE)
2817 tls_type = GOT_TLS_IE_NEG;
2818
2819 r_type_tls = r_type;
2820 if (! elf_i386_tls_transition (info, input_bfd,
2821 input_section, contents,
2822 symtab_hdr, sym_hashes,
2823 &r_type_tls, tls_type, rel,
2824 relend, h, r_symndx, true))
2825 return false;
2826
2827 if (r_type_tls == R_386_TLS_LE_32)
2828 {
2829 BFD_ASSERT (! unresolved_reloc);
2830 if (r_type == R_386_TLS_GD)
2831 {
2832 unsigned int type;
2833 bfd_vma roff;
2834
2835 /* GD->LE transition. */
2836 type = *(contents + rel->r_offset - 2);
2837 if (type == 0x04)
2838 {
2839 /* Change
2840 leal foo@tlsgd(,%ebx,1), %eax
2841 call ___tls_get_addr@PLT
2842 into:
2843 movl %gs:0, %eax
2844 subl $foo@tpoff, %eax
2845 (6 byte form of subl). */
2846 roff = rel->r_offset + 5;
2847 }
2848 else
2849 {
2850 /* Change
2851 leal foo@tlsgd(%ebx), %eax
2852 call ___tls_get_addr@PLT
2853 nop
2854 or
2855 leal foo@tlsgd(%reg), %eax
2856 call *___tls_get_addr@GOT(%reg)
2857 which may be converted to
2858 addr32 call ___tls_get_addr
2859 into:
2860 movl %gs:0, %eax; subl $foo@tpoff, %eax
2861 (6 byte form of subl). */
2862 roff = rel->r_offset + 6;
2863 }
2864 memcpy (contents + roff - 8,
2865 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2866 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2867 contents + roff);
2868 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2869 rel++;
2870 wrel++;
2871 continue;
2872 }
2873 else if (r_type == R_386_TLS_GOTDESC)
2874 {
2875 /* GDesc -> LE transition.
2876 It's originally something like:
2877 leal x@tlsdesc(%ebx), %eax
2878
2879 leal x@ntpoff, %eax
2880
2881 Registers other than %eax may be set up here. */
2882
2883 unsigned int val;
2884 bfd_vma roff;
2885
2886 roff = rel->r_offset;
2887 val = bfd_get_8 (input_bfd, contents + roff - 1);
2888
2889 /* Now modify the instruction as appropriate. */
2890 /* aoliva FIXME: remove the above and xor the byte
2891 below with 0x86. */
2892 bfd_put_8 (output_bfd, val ^ 0x86,
2893 contents + roff - 1);
2894 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2895 contents + roff);
2896 continue;
2897 }
2898 else if (r_type == R_386_TLS_DESC_CALL)
2899 {
2900 /* GDesc -> LE transition.
2901 It's originally:
2902 call *(%eax)
2903 Turn it into:
2904 xchg %ax,%ax */
2905
2906 bfd_vma roff;
2907
2908 roff = rel->r_offset;
2909 bfd_put_8 (output_bfd, 0x66, contents + roff);
2910 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2911 continue;
2912 }
2913 else if (r_type == R_386_TLS_IE)
2914 {
2915 unsigned int val;
2916
2917 /* IE->LE transition:
2918 Originally it can be one of:
2919 movl foo, %eax
2920 movl foo, %reg
2921 addl foo, %reg
2922 We change it into:
2923 movl $foo, %eax
2924 movl $foo, %reg
2925 addl $foo, %reg. */
2926 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2927 if (val == 0xa1)
2928 {
2929 /* movl foo, %eax. */
2930 bfd_put_8 (output_bfd, 0xb8,
2931 contents + rel->r_offset - 1);
2932 }
2933 else
2934 {
2935 unsigned int type;
2936
2937 type = bfd_get_8 (input_bfd,
2938 contents + rel->r_offset - 2);
2939 switch (type)
2940 {
2941 case 0x8b:
2942 /* movl */
2943 bfd_put_8 (output_bfd, 0xc7,
2944 contents + rel->r_offset - 2);
2945 bfd_put_8 (output_bfd,
2946 0xc0 | ((val >> 3) & 7),
2947 contents + rel->r_offset - 1);
2948 break;
2949 case 0x03:
2950 /* addl */
2951 bfd_put_8 (output_bfd, 0x81,
2952 contents + rel->r_offset - 2);
2953 bfd_put_8 (output_bfd,
2954 0xc0 | ((val >> 3) & 7),
2955 contents + rel->r_offset - 1);
2956 break;
2957 default:
2958 BFD_FAIL ();
2959 break;
2960 }
2961 }
2962 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2963 contents + rel->r_offset);
2964 continue;
2965 }
2966 else
2967 {
2968 unsigned int val, type;
2969
2970 /* {IE_32,GOTIE}->LE transition:
2971 Originally it can be one of:
2972 subl foo(%reg1), %reg2
2973 movl foo(%reg1), %reg2
2974 addl foo(%reg1), %reg2
2975 We change it into:
2976 subl $foo, %reg2
2977 movl $foo, %reg2 (6 byte form)
2978 addl $foo, %reg2. */
2979 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2980 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2981 if (type == 0x8b)
2982 {
2983 /* movl */
2984 bfd_put_8 (output_bfd, 0xc7,
2985 contents + rel->r_offset - 2);
2986 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2987 contents + rel->r_offset - 1);
2988 }
2989 else if (type == 0x2b)
2990 {
2991 /* subl */
2992 bfd_put_8 (output_bfd, 0x81,
2993 contents + rel->r_offset - 2);
2994 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2995 contents + rel->r_offset - 1);
2996 }
2997 else if (type == 0x03)
2998 {
2999 /* addl */
3000 bfd_put_8 (output_bfd, 0x81,
3001 contents + rel->r_offset - 2);
3002 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3003 contents + rel->r_offset - 1);
3004 }
3005 else
3006 BFD_FAIL ();
3007 if (r_type == R_386_TLS_GOTIE)
3008 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3009 contents + rel->r_offset);
3010 else
3011 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3012 contents + rel->r_offset);
3013 continue;
3014 }
3015 }
3016
3017 if (htab->elf.sgot == NULL)
3018 abort ();
3019
3020 if (h != NULL)
3021 {
3022 off = h->got.offset;
3023 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3024 }
3025 else
3026 {
3027 if (local_got_offsets == NULL)
3028 abort ();
3029
3030 off = local_got_offsets[r_symndx];
3031 offplt = local_tlsdesc_gotents[r_symndx];
3032 }
3033
3034 if ((off & 1) != 0)
3035 off &= ~1;
3036 else
3037 {
3038 Elf_Internal_Rela outrel;
3039 int dr_type;
3040 asection *sreloc;
3041
3042 if (htab->elf.srelgot == NULL)
3043 abort ();
3044
3045 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3046
3047 if (GOT_TLS_GDESC_P (tls_type))
3048 {
3049 bfd_byte *loc;
3050 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3051 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3052 <= htab->elf.sgotplt->size);
3053 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3054 + htab->elf.sgotplt->output_offset
3055 + offplt
3056 + htab->sgotplt_jump_table_size);
3057 sreloc = htab->elf.srelplt;
3058 loc = sreloc->contents;
3059 loc += (htab->next_tls_desc_index++
3060 * sizeof (Elf32_External_Rel));
3061 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3062 <= sreloc->contents + sreloc->size);
3063 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3064 if (indx == 0)
3065 {
3066 BFD_ASSERT (! unresolved_reloc);
3067 bfd_put_32 (output_bfd,
3068 relocation - _bfd_x86_elf_dtpoff_base (info),
3069 htab->elf.sgotplt->contents + offplt
3070 + htab->sgotplt_jump_table_size + 4);
3071 }
3072 else
3073 {
3074 bfd_put_32 (output_bfd, 0,
3075 htab->elf.sgotplt->contents + offplt
3076 + htab->sgotplt_jump_table_size + 4);
3077 }
3078 }
3079
3080 sreloc = htab->elf.srelgot;
3081
3082 outrel.r_offset = (htab->elf.sgot->output_section->vma
3083 + htab->elf.sgot->output_offset + off);
3084
3085 if (GOT_TLS_GD_P (tls_type))
3086 dr_type = R_386_TLS_DTPMOD32;
3087 else if (GOT_TLS_GDESC_P (tls_type))
3088 goto dr_done;
3089 else if (tls_type == GOT_TLS_IE_POS)
3090 dr_type = R_386_TLS_TPOFF;
3091 else
3092 dr_type = R_386_TLS_TPOFF32;
3093
3094 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3095 bfd_put_32 (output_bfd,
3096 relocation - _bfd_x86_elf_dtpoff_base (info),
3097 htab->elf.sgot->contents + off);
3098 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3099 bfd_put_32 (output_bfd,
3100 _bfd_x86_elf_dtpoff_base (info) - relocation,
3101 htab->elf.sgot->contents + off);
3102 else if (dr_type != R_386_TLS_DESC)
3103 bfd_put_32 (output_bfd, 0,
3104 htab->elf.sgot->contents + off);
3105 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3106
3107 elf_append_rel (output_bfd, sreloc, &outrel);
3108
3109 if (GOT_TLS_GD_P (tls_type))
3110 {
3111 if (indx == 0)
3112 {
3113 BFD_ASSERT (! unresolved_reloc);
3114 bfd_put_32 (output_bfd,
3115 relocation - _bfd_x86_elf_dtpoff_base (info),
3116 htab->elf.sgot->contents + off + 4);
3117 }
3118 else
3119 {
3120 bfd_put_32 (output_bfd, 0,
3121 htab->elf.sgot->contents + off + 4);
3122 outrel.r_info = ELF32_R_INFO (indx,
3123 R_386_TLS_DTPOFF32);
3124 outrel.r_offset += 4;
3125 elf_append_rel (output_bfd, sreloc, &outrel);
3126 }
3127 }
3128 else if (tls_type == GOT_TLS_IE_BOTH)
3129 {
3130 bfd_put_32 (output_bfd,
3131 (indx == 0
3132 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3133 : 0),
3134 htab->elf.sgot->contents + off + 4);
3135 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3136 outrel.r_offset += 4;
3137 elf_append_rel (output_bfd, sreloc, &outrel);
3138 }
3139
3140 dr_done:
3141 if (h != NULL)
3142 h->got.offset |= 1;
3143 else
3144 local_got_offsets[r_symndx] |= 1;
3145 }
3146
3147 if (off >= (bfd_vma) -2
3148 && ! GOT_TLS_GDESC_P (tls_type))
3149 abort ();
3150 if (r_type_tls == R_386_TLS_GOTDESC
3151 || r_type_tls == R_386_TLS_DESC_CALL)
3152 {
3153 relocation = htab->sgotplt_jump_table_size + offplt;
3154 unresolved_reloc = false;
3155 }
3156 else if (r_type_tls == r_type)
3157 {
3158 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3159 + htab->elf.sgotplt->output_offset;
3160 relocation = htab->elf.sgot->output_section->vma
3161 + htab->elf.sgot->output_offset + off - g_o_t;
3162 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3163 && tls_type == GOT_TLS_IE_BOTH)
3164 relocation += 4;
3165 if (r_type == R_386_TLS_IE)
3166 relocation += g_o_t;
3167 unresolved_reloc = false;
3168 }
3169 else if (r_type == R_386_TLS_GD)
3170 {
3171 unsigned int val, type;
3172 bfd_vma roff;
3173
3174 /* GD->IE transition. */
3175 type = *(contents + rel->r_offset - 2);
3176 val = *(contents + rel->r_offset - 1);
3177 if (type == 0x04)
3178 {
3179 /* Change
3180 leal foo@tlsgd(,%ebx,1), %eax
3181 call ___tls_get_addr@PLT
3182 into:
3183 movl %gs:0, %eax
3184 subl $foo@gottpoff(%ebx), %eax. */
3185 val >>= 3;
3186 roff = rel->r_offset - 3;
3187 }
3188 else
3189 {
3190 /* Change
3191 leal foo@tlsgd(%ebx), %eax
3192 call ___tls_get_addr@PLT
3193 nop
3194 or
3195 leal foo@tlsgd(%reg), %eax
3196 call *___tls_get_addr@GOT(%reg)
3197 which may be converted to
3198 addr32 call ___tls_get_addr
3199 into:
3200 movl %gs:0, %eax;
3201 subl $foo@gottpoff(%reg), %eax. */
3202 roff = rel->r_offset - 2;
3203 }
3204 memcpy (contents + roff,
3205 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3206 contents[roff + 7] = 0x80 | (val & 7);
3207 /* If foo is used only with foo@gotntpoff(%reg) and
3208 foo@indntpoff, but not with foo@gottpoff(%reg), change
3209 subl $foo@gottpoff(%reg), %eax
3210 into:
3211 addl $foo@gotntpoff(%reg), %eax. */
3212 if (tls_type == GOT_TLS_IE_POS)
3213 contents[roff + 6] = 0x03;
3214 bfd_put_32 (output_bfd,
3215 htab->elf.sgot->output_section->vma
3216 + htab->elf.sgot->output_offset + off
3217 - htab->elf.sgotplt->output_section->vma
3218 - htab->elf.sgotplt->output_offset,
3219 contents + roff + 8);
3220 /* Skip R_386_PLT32 and R_386_GOT32X. */
3221 rel++;
3222 wrel++;
3223 continue;
3224 }
3225 else if (r_type == R_386_TLS_GOTDESC)
3226 {
3227 /* GDesc -> IE transition.
3228 It's originally something like:
3229 leal x@tlsdesc(%ebx), %eax
3230
3231 Change it to:
3232 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3233 or:
3234 movl x@gottpoff(%ebx), %eax # before negl %eax
3235
3236 Registers other than %eax may be set up here. */
3237
3238 bfd_vma roff;
3239
3240 /* First, make sure it's a leal adding ebx to a 32-bit
3241 offset into any register, although it's probably
3242 almost always going to be eax. */
3243 roff = rel->r_offset;
3244
3245 /* Now modify the instruction as appropriate. */
3246 /* To turn a leal into a movl in the form we use it, it
3247 suffices to change the first byte from 0x8d to 0x8b.
3248 aoliva FIXME: should we decide to keep the leal, all
3249 we have to do is remove the statement below, and
3250 adjust the relaxation of R_386_TLS_DESC_CALL. */
3251 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3252
3253 if (tls_type == GOT_TLS_IE_BOTH)
3254 off += 4;
3255
3256 bfd_put_32 (output_bfd,
3257 htab->elf.sgot->output_section->vma
3258 + htab->elf.sgot->output_offset + off
3259 - htab->elf.sgotplt->output_section->vma
3260 - htab->elf.sgotplt->output_offset,
3261 contents + roff);
3262 continue;
3263 }
3264 else if (r_type == R_386_TLS_DESC_CALL)
3265 {
3266 /* GDesc -> IE transition.
3267 It's originally:
3268 call *(%eax)
3269
3270 Change it to:
3271 xchg %ax,%ax
3272 or
3273 negl %eax
3274 depending on how we transformed the TLS_GOTDESC above.
3275 */
3276
3277 bfd_vma roff;
3278
3279 roff = rel->r_offset;
3280
3281 /* Now modify the instruction as appropriate. */
3282 if (tls_type != GOT_TLS_IE_NEG)
3283 {
3284 /* xchg %ax,%ax */
3285 bfd_put_8 (output_bfd, 0x66, contents + roff);
3286 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3287 }
3288 else
3289 {
3290 /* negl %eax */
3291 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3292 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3293 }
3294
3295 continue;
3296 }
3297 else
3298 BFD_ASSERT (false);
3299 break;
3300
3301 case R_386_TLS_LDM:
3302 if (! elf_i386_tls_transition (info, input_bfd,
3303 input_section, contents,
3304 symtab_hdr, sym_hashes,
3305 &r_type, GOT_UNKNOWN, rel,
3306 relend, h, r_symndx, true))
3307 return false;
3308
3309 if (r_type != R_386_TLS_LDM)
3310 {
3311 /* LD->LE transition. Change
3312 leal foo@tlsldm(%ebx) %eax
3313 call ___tls_get_addr@PLT
3314 into:
3315 movl %gs:0, %eax
3316 nop
3317 leal 0(%esi,1), %esi
3318 or change
3319 leal foo@tlsldm(%reg) %eax
3320 call *___tls_get_addr@GOT(%reg)
3321 which may be converted to
3322 addr32 call ___tls_get_addr
3323 into:
3324 movl %gs:0, %eax
3325 leal 0(%esi), %esi */
3326 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3327 if (*(contents + rel->r_offset + 4) == 0xff
3328 || *(contents + rel->r_offset + 4) == 0x67)
3329 memcpy (contents + rel->r_offset - 2,
3330 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3331 else
3332 memcpy (contents + rel->r_offset - 2,
3333 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3334 /* Skip R_386_PC32/R_386_PLT32. */
3335 rel++;
3336 wrel++;
3337 continue;
3338 }
3339
3340 if (htab->elf.sgot == NULL)
3341 abort ();
3342
3343 off = htab->tls_ld_or_ldm_got.offset;
3344 if (off & 1)
3345 off &= ~1;
3346 else
3347 {
3348 Elf_Internal_Rela outrel;
3349
3350 if (htab->elf.srelgot == NULL)
3351 abort ();
3352
3353 outrel.r_offset = (htab->elf.sgot->output_section->vma
3354 + htab->elf.sgot->output_offset + off);
3355
3356 bfd_put_32 (output_bfd, 0,
3357 htab->elf.sgot->contents + off);
3358 bfd_put_32 (output_bfd, 0,
3359 htab->elf.sgot->contents + off + 4);
3360 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3361 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3362 htab->tls_ld_or_ldm_got.offset |= 1;
3363 }
3364 relocation = htab->elf.sgot->output_section->vma
3365 + htab->elf.sgot->output_offset + off
3366 - htab->elf.sgotplt->output_section->vma
3367 - htab->elf.sgotplt->output_offset;
3368 unresolved_reloc = false;
3369 break;
3370
3371 case R_386_TLS_LDO_32:
3372 if (!bfd_link_executable (info)
3373 || (input_section->flags & SEC_CODE) == 0)
3374 relocation -= _bfd_x86_elf_dtpoff_base (info);
3375 else
3376 /* When converting LDO to LE, we must negate. */
3377 relocation = -elf_i386_tpoff (info, relocation);
3378 break;
3379
3380 case R_386_TLS_LE_32:
3381 case R_386_TLS_LE:
3382 if (!bfd_link_executable (info))
3383 {
3384 Elf_Internal_Rela outrel;
3385 asection *sreloc;
3386
3387 outrel.r_offset = rel->r_offset
3388 + input_section->output_section->vma
3389 + input_section->output_offset;
3390 if (h != NULL && h->dynindx != -1)
3391 indx = h->dynindx;
3392 else
3393 indx = 0;
3394 if (r_type == R_386_TLS_LE_32)
3395 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3396 else
3397 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3398 sreloc = elf_section_data (input_section)->sreloc;
3399 if (sreloc == NULL)
3400 abort ();
3401 elf_append_rel (output_bfd, sreloc, &outrel);
3402 if (indx)
3403 continue;
3404 else if (r_type == R_386_TLS_LE_32)
3405 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3406 else
3407 relocation -= _bfd_x86_elf_dtpoff_base (info);
3408 }
3409 else if (r_type == R_386_TLS_LE_32)
3410 relocation = elf_i386_tpoff (info, relocation);
3411 else
3412 relocation = -elf_i386_tpoff (info, relocation);
3413 break;
3414
3415 default:
3416 break;
3417 }
3418
3419 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3420 because such sections are not SEC_ALLOC and thus ld.so will
3421 not process them. */
3422 if (unresolved_reloc
3423 && !((input_section->flags & SEC_DEBUGGING) != 0
3424 && h->def_dynamic)
3425 && _bfd_elf_section_offset (output_bfd, info, input_section,
3426 rel->r_offset) != (bfd_vma) -1)
3427 {
3428 _bfd_error_handler
3429 /* xgettext:c-format */
3430 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3431 input_bfd,
3432 input_section,
3433 (uint64_t) rel->r_offset,
3434 howto->name,
3435 h->root.root.string);
3436 return false;
3437 }
3438
3439 do_relocation:
3440 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3441 contents, rel->r_offset,
3442 relocation, 0);
3443
3444 check_relocation_error:
3445 if (r != bfd_reloc_ok)
3446 {
3447 const char *name;
3448
3449 if (h != NULL)
3450 name = h->root.root.string;
3451 else
3452 {
3453 name = bfd_elf_string_from_elf_section (input_bfd,
3454 symtab_hdr->sh_link,
3455 sym->st_name);
3456 if (name == NULL)
3457 return false;
3458 if (*name == '\0')
3459 name = bfd_section_name (sec);
3460 }
3461
3462 if (r == bfd_reloc_overflow)
3463 (*info->callbacks->reloc_overflow)
3464 (info, (h ? &h->root : NULL), name, howto->name,
3465 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3466 else
3467 {
3468 _bfd_error_handler
3469 /* xgettext:c-format */
3470 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3471 input_bfd, input_section,
3472 (uint64_t) rel->r_offset, name, (int) r);
3473 return false;
3474 }
3475 }
3476
3477 if (wrel != rel)
3478 *wrel = *rel;
3479 }
3480
3481 if (wrel != rel)
3482 {
3483 Elf_Internal_Shdr *rel_hdr;
3484 size_t deleted = rel - wrel;
3485
3486 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3487 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3488 if (rel_hdr->sh_size == 0)
3489 {
3490 /* It is too late to remove an empty reloc section. Leave
3491 one NONE reloc.
3492 ??? What is wrong with an empty section??? */
3493 rel_hdr->sh_size = rel_hdr->sh_entsize;
3494 deleted -= 1;
3495 }
3496 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3497 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3498 input_section->reloc_count -= deleted;
3499 }
3500
3501 return true;
3502 }
3503
3504 /* Finish up dynamic symbol handling. We set the contents of various
3505 dynamic sections here. */
3506
3507 static bool
3508 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3509 struct bfd_link_info *info,
3510 struct elf_link_hash_entry *h,
3511 Elf_Internal_Sym *sym)
3512 {
3513 struct elf_x86_link_hash_table *htab;
3514 unsigned plt_entry_size;
3515 struct elf_x86_link_hash_entry *eh;
3516 bool local_undefweak;
3517 bool use_plt_second;
3518
3519 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3520 if (htab == NULL)
3521 return false;
3522
3523 plt_entry_size = htab->plt.plt_entry_size;
3524
3525 /* Use the second PLT section only if there is .plt section. */
3526 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3527
3528 eh = (struct elf_x86_link_hash_entry *) h;
3529 if (eh->no_finish_dynamic_symbol)
3530 abort ();
3531
3532 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3533 resolved undefined weak symbols in executable so that their
3534 references have value 0 at run-time. */
3535 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3536
3537 if (h->plt.offset != (bfd_vma) -1)
3538 {
3539 bfd_vma plt_index, plt_offset;
3540 bfd_vma got_offset;
3541 Elf_Internal_Rela rel;
3542 bfd_byte *loc;
3543 asection *plt, *resolved_plt, *gotplt, *relplt;
3544
3545 /* When building a static executable, use .iplt, .igot.plt and
3546 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3547 if (htab->elf.splt != NULL)
3548 {
3549 plt = htab->elf.splt;
3550 gotplt = htab->elf.sgotplt;
3551 relplt = htab->elf.srelplt;
3552 }
3553 else
3554 {
3555 plt = htab->elf.iplt;
3556 gotplt = htab->elf.igotplt;
3557 relplt = htab->elf.irelplt;
3558 }
3559
3560 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3561
3562 /* Get the index in the procedure linkage table which
3563 corresponds to this symbol. This is the index of this symbol
3564 in all the symbols for which we are making plt entries. The
3565 first entry in the procedure linkage table is reserved.
3566
3567 Get the offset into the .got table of the entry that
3568 corresponds to this function. Each .got entry is 4 bytes.
3569 The first three are reserved.
3570
3571 For static executables, we don't reserve anything. */
3572
3573 if (plt == htab->elf.splt)
3574 {
3575 got_offset = (h->plt.offset / plt_entry_size
3576 - htab->plt.has_plt0);
3577 got_offset = (got_offset + 3) * 4;
3578 }
3579 else
3580 {
3581 got_offset = h->plt.offset / plt_entry_size;
3582 got_offset = got_offset * 4;
3583 }
3584
3585 /* Fill in the entry in the procedure linkage table and update
3586 the first slot. */
3587 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3588 plt_entry_size);
3589
3590 if (use_plt_second)
3591 {
3592 const bfd_byte *plt_entry;
3593 if (bfd_link_pic (info))
3594 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3595 else
3596 plt_entry = htab->non_lazy_plt->plt_entry;
3597 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3598 plt_entry, htab->non_lazy_plt->plt_entry_size);
3599
3600 resolved_plt = htab->plt_second;
3601 plt_offset = eh->plt_second.offset;
3602 }
3603 else
3604 {
3605 resolved_plt = plt;
3606 plt_offset = h->plt.offset;
3607 }
3608
3609 if (! bfd_link_pic (info))
3610 {
3611 bfd_put_32 (output_bfd,
3612 (gotplt->output_section->vma
3613 + gotplt->output_offset
3614 + got_offset),
3615 resolved_plt->contents + plt_offset
3616 + htab->plt.plt_got_offset);
3617
3618 if (htab->elf.target_os == is_vxworks)
3619 {
3620 int s, k, reloc_index;
3621
3622 /* Create the R_386_32 relocation referencing the GOT
3623 for this PLT entry. */
3624
3625 /* S: Current slot number (zero-based). */
3626 s = ((h->plt.offset - htab->plt.plt_entry_size)
3627 / htab->plt.plt_entry_size);
3628 /* K: Number of relocations for PLTResolve. */
3629 if (bfd_link_pic (info))
3630 k = PLTRESOLVE_RELOCS_SHLIB;
3631 else
3632 k = PLTRESOLVE_RELOCS;
3633 /* Skip the PLTresolve relocations, and the relocations for
3634 the other PLT slots. */
3635 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3636 loc = (htab->srelplt2->contents + reloc_index
3637 * sizeof (Elf32_External_Rel));
3638
3639 rel.r_offset = (plt->output_section->vma
3640 + plt->output_offset
3641 + h->plt.offset + 2),
3642 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3643 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3644
3645 /* Create the R_386_32 relocation referencing the beginning of
3646 the PLT for this GOT entry. */
3647 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3648 + htab->elf.sgotplt->output_offset
3649 + got_offset);
3650 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3651 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3652 loc + sizeof (Elf32_External_Rel));
3653 }
3654 }
3655 else
3656 {
3657 bfd_put_32 (output_bfd, got_offset,
3658 resolved_plt->contents + plt_offset
3659 + htab->plt.plt_got_offset);
3660 }
3661
3662 /* Fill in the entry in the global offset table. Leave the entry
3663 as zero for undefined weak symbol in PIE. No PLT relocation
3664 against undefined weak symbol in PIE. */
3665 if (!local_undefweak)
3666 {
3667 if (htab->plt.has_plt0)
3668 bfd_put_32 (output_bfd,
3669 (plt->output_section->vma
3670 + plt->output_offset
3671 + h->plt.offset
3672 + htab->lazy_plt->plt_lazy_offset),
3673 gotplt->contents + got_offset);
3674
3675 /* Fill in the entry in the .rel.plt section. */
3676 rel.r_offset = (gotplt->output_section->vma
3677 + gotplt->output_offset
3678 + got_offset);
3679 if (PLT_LOCAL_IFUNC_P (info, h))
3680 {
3681 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3682 h->root.root.string,
3683 h->root.u.def.section->owner);
3684
3685 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3686 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3687 in the .got.plt section. */
3688 bfd_put_32 (output_bfd,
3689 (h->root.u.def.value
3690 + h->root.u.def.section->output_section->vma
3691 + h->root.u.def.section->output_offset),
3692 gotplt->contents + got_offset);
3693 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3694
3695 if (htab->params->report_relative_reloc)
3696 _bfd_x86_elf_link_report_relative_reloc
3697 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3698
3699 /* R_386_IRELATIVE comes last. */
3700 plt_index = htab->next_irelative_index--;
3701 }
3702 else
3703 {
3704 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3705 plt_index = htab->next_jump_slot_index++;
3706 }
3707
3708 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3709 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3710
3711 /* Don't fill the second and third slots in PLT entry for
3712 static executables nor without PLT0. */
3713 if (plt == htab->elf.splt && htab->plt.has_plt0)
3714 {
3715 bfd_put_32 (output_bfd,
3716 plt_index * sizeof (Elf32_External_Rel),
3717 plt->contents + h->plt.offset
3718 + htab->lazy_plt->plt_reloc_offset);
3719 bfd_put_32 (output_bfd,
3720 - (h->plt.offset
3721 + htab->lazy_plt->plt_plt_offset + 4),
3722 (plt->contents + h->plt.offset
3723 + htab->lazy_plt->plt_plt_offset));
3724 }
3725 }
3726 }
3727 else if (eh->plt_got.offset != (bfd_vma) -1)
3728 {
3729 bfd_vma got_offset, plt_offset;
3730 asection *plt, *got, *gotplt;
3731 const bfd_byte *got_plt_entry;
3732
3733 /* Set the entry in the GOT procedure linkage table. */
3734 plt = htab->plt_got;
3735 got = htab->elf.sgot;
3736 gotplt = htab->elf.sgotplt;
3737 got_offset = h->got.offset;
3738
3739 if (got_offset == (bfd_vma) -1
3740 || plt == NULL
3741 || got == NULL
3742 || gotplt == NULL)
3743 abort ();
3744
3745 /* Fill in the entry in the GOT procedure linkage table. */
3746 if (! bfd_link_pic (info))
3747 {
3748 got_plt_entry = htab->non_lazy_plt->plt_entry;
3749 got_offset += got->output_section->vma + got->output_offset;
3750 }
3751 else
3752 {
3753 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3754 got_offset += (got->output_section->vma
3755 + got->output_offset
3756 - gotplt->output_section->vma
3757 - gotplt->output_offset);
3758 }
3759
3760 plt_offset = eh->plt_got.offset;
3761 memcpy (plt->contents + plt_offset, got_plt_entry,
3762 htab->non_lazy_plt->plt_entry_size);
3763 bfd_put_32 (output_bfd, got_offset,
3764 (plt->contents + plt_offset
3765 + htab->non_lazy_plt->plt_got_offset));
3766 }
3767
3768 if (!local_undefweak
3769 && !h->def_regular
3770 && (h->plt.offset != (bfd_vma) -1
3771 || eh->plt_got.offset != (bfd_vma) -1))
3772 {
3773 /* Mark the symbol as undefined, rather than as defined in
3774 the .plt section. Leave the value if there were any
3775 relocations where pointer equality matters (this is a clue
3776 for the dynamic linker, to make function pointer
3777 comparisons work between an application and shared
3778 library), otherwise set it to zero. If a function is only
3779 called from a binary, there is no need to slow down
3780 shared libraries because of that. */
3781 sym->st_shndx = SHN_UNDEF;
3782 if (!h->pointer_equality_needed)
3783 sym->st_value = 0;
3784 }
3785
3786 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3787
3788 /* Don't generate dynamic GOT relocation against undefined weak
3789 symbol in executable. */
3790 if (h->got.offset != (bfd_vma) -1
3791 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3792 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3793 && !local_undefweak)
3794 {
3795 Elf_Internal_Rela rel;
3796 asection *relgot = htab->elf.srelgot;
3797 const char *relative_reloc_name = NULL;
3798
3799 /* This symbol has an entry in the global offset table. Set it
3800 up. */
3801
3802 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3803 abort ();
3804
3805 rel.r_offset = (htab->elf.sgot->output_section->vma
3806 + htab->elf.sgot->output_offset
3807 + (h->got.offset & ~(bfd_vma) 1));
3808
3809 /* If this is a static link, or it is a -Bsymbolic link and the
3810 symbol is defined locally or was forced to be local because
3811 of a version file, we just want to emit a RELATIVE reloc.
3812 The entry in the global offset table will already have been
3813 initialized in the relocate_section function. */
3814 if (h->def_regular
3815 && h->type == STT_GNU_IFUNC)
3816 {
3817 if (h->plt.offset == (bfd_vma) -1)
3818 {
3819 /* STT_GNU_IFUNC is referenced without PLT. */
3820 if (htab->elf.splt == NULL)
3821 {
3822 /* use .rel[a].iplt section to store .got relocations
3823 in static executable. */
3824 relgot = htab->elf.irelplt;
3825 }
3826 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3827 {
3828 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3829 h->root.root.string,
3830 h->root.u.def.section->owner);
3831
3832 bfd_put_32 (output_bfd,
3833 (h->root.u.def.value
3834 + h->root.u.def.section->output_section->vma
3835 + h->root.u.def.section->output_offset),
3836 htab->elf.sgot->contents + h->got.offset);
3837 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3838 relative_reloc_name = "R_386_IRELATIVE";
3839 }
3840 else
3841 goto do_glob_dat;
3842 }
3843 else if (bfd_link_pic (info))
3844 {
3845 /* Generate R_386_GLOB_DAT. */
3846 goto do_glob_dat;
3847 }
3848 else
3849 {
3850 asection *plt;
3851 bfd_vma plt_offset;
3852
3853 if (!h->pointer_equality_needed)
3854 abort ();
3855
3856 /* For non-shared object, we can't use .got.plt, which
3857 contains the real function addres if we need pointer
3858 equality. We load the GOT entry with the PLT entry. */
3859 if (htab->plt_second != NULL)
3860 {
3861 plt = htab->plt_second;
3862 plt_offset = eh->plt_second.offset;
3863 }
3864 else
3865 {
3866 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3867 plt_offset = h->plt.offset;
3868 }
3869 bfd_put_32 (output_bfd,
3870 (plt->output_section->vma
3871 + plt->output_offset + plt_offset),
3872 htab->elf.sgot->contents + h->got.offset);
3873 return true;
3874 }
3875 }
3876 else if (bfd_link_pic (info)
3877 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3878 {
3879 BFD_ASSERT((h->got.offset & 1) != 0);
3880 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3881 relative_reloc_name = "R_386_RELATIVE";
3882 }
3883 else
3884 {
3885 BFD_ASSERT((h->got.offset & 1) == 0);
3886 do_glob_dat:
3887 bfd_put_32 (output_bfd, (bfd_vma) 0,
3888 htab->elf.sgot->contents + h->got.offset);
3889 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3890 }
3891
3892 if (relative_reloc_name != NULL
3893 && htab->params->report_relative_reloc)
3894 _bfd_x86_elf_link_report_relative_reloc
3895 (info, relgot, h, sym, relative_reloc_name, &rel);
3896
3897 elf_append_rel (output_bfd, relgot, &rel);
3898 }
3899
3900 if (h->needs_copy)
3901 {
3902 Elf_Internal_Rela rel;
3903 asection *s;
3904
3905 /* This symbol needs a copy reloc. Set it up. */
3906 VERIFY_COPY_RELOC (h, htab)
3907
3908 rel.r_offset = (h->root.u.def.value
3909 + h->root.u.def.section->output_section->vma
3910 + h->root.u.def.section->output_offset);
3911 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3912 if (h->root.u.def.section == htab->elf.sdynrelro)
3913 s = htab->elf.sreldynrelro;
3914 else
3915 s = htab->elf.srelbss;
3916 elf_append_rel (output_bfd, s, &rel);
3917 }
3918
3919 return true;
3920 }
3921
3922 /* Finish up local dynamic symbol handling. We set the contents of
3923 various dynamic sections here. */
3924
3925 static int
3926 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3927 {
3928 struct elf_link_hash_entry *h
3929 = (struct elf_link_hash_entry *) *slot;
3930 struct bfd_link_info *info
3931 = (struct bfd_link_info *) inf;
3932
3933 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3934 h, NULL);
3935 }
3936
3937 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3938 here since undefined weak symbol may not be dynamic and may not be
3939 called for elf_i386_finish_dynamic_symbol. */
3940
3941 static bool
3942 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3943 void *inf)
3944 {
3945 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3946 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3947
3948 if (h->root.type != bfd_link_hash_undefweak
3949 || h->dynindx != -1)
3950 return true;
3951
3952 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3953 info, h, NULL);
3954 }
3955
3956 /* Used to decide how to sort relocs in an optimal manner for the
3957 dynamic linker, before writing them out. */
3958
3959 static enum elf_reloc_type_class
3960 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3961 const asection *rel_sec ATTRIBUTE_UNUSED,
3962 const Elf_Internal_Rela *rela)
3963 {
3964 bfd *abfd = info->output_bfd;
3965 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3966 struct elf_link_hash_table *htab = elf_hash_table (info);
3967
3968 if (htab->dynsym != NULL
3969 && htab->dynsym->contents != NULL)
3970 {
3971 /* Check relocation against STT_GNU_IFUNC symbol if there are
3972 dynamic symbols. */
3973 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3974 if (r_symndx != STN_UNDEF)
3975 {
3976 Elf_Internal_Sym sym;
3977 if (!bed->s->swap_symbol_in (abfd,
3978 (htab->dynsym->contents
3979 + r_symndx * sizeof (Elf32_External_Sym)),
3980 0, &sym))
3981 abort ();
3982
3983 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3984 return reloc_class_ifunc;
3985 }
3986 }
3987
3988 switch (ELF32_R_TYPE (rela->r_info))
3989 {
3990 case R_386_IRELATIVE:
3991 return reloc_class_ifunc;
3992 case R_386_RELATIVE:
3993 return reloc_class_relative;
3994 case R_386_JUMP_SLOT:
3995 return reloc_class_plt;
3996 case R_386_COPY:
3997 return reloc_class_copy;
3998 default:
3999 return reloc_class_normal;
4000 }
4001 }
4002
4003 /* Finish up the dynamic sections. */
4004
4005 static bool
4006 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4007 struct bfd_link_info *info)
4008 {
4009 struct elf_x86_link_hash_table *htab;
4010
4011 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4012 if (htab == NULL)
4013 return false;
4014
4015 if (!htab->elf.dynamic_sections_created)
4016 return true;
4017
4018 if (htab->elf.splt && htab->elf.splt->size > 0)
4019 {
4020 if (bfd_is_abs_section (htab->elf.splt->output_section))
4021 {
4022 info->callbacks->einfo
4023 (_("%F%P: discarded output section: `%pA'\n"),
4024 htab->elf.splt);
4025 return false;
4026 }
4027
4028 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4029 really seem like the right value. */
4030 elf_section_data (htab->elf.splt->output_section)
4031 ->this_hdr.sh_entsize = 4;
4032
4033 if (htab->plt.has_plt0)
4034 {
4035 /* Fill in the special first entry in the procedure linkage
4036 table. */
4037 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4038 htab->lazy_plt->plt0_entry_size);
4039 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4040 htab->plt0_pad_byte,
4041 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4042 if (!bfd_link_pic (info))
4043 {
4044 bfd_put_32 (output_bfd,
4045 (htab->elf.sgotplt->output_section->vma
4046 + htab->elf.sgotplt->output_offset
4047 + 4),
4048 htab->elf.splt->contents
4049 + htab->lazy_plt->plt0_got1_offset);
4050 bfd_put_32 (output_bfd,
4051 (htab->elf.sgotplt->output_section->vma
4052 + htab->elf.sgotplt->output_offset
4053 + 8),
4054 htab->elf.splt->contents
4055 + htab->lazy_plt->plt0_got2_offset);
4056
4057 if (htab->elf.target_os == is_vxworks)
4058 {
4059 Elf_Internal_Rela rel;
4060 int num_plts = (htab->elf.splt->size
4061 / htab->plt.plt_entry_size) - 1;
4062 unsigned char *p;
4063 asection *srelplt2 = htab->srelplt2;
4064
4065 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4066 + 4. On IA32 we use REL relocations so the
4067 addend goes in the PLT directly. */
4068 rel.r_offset = (htab->elf.splt->output_section->vma
4069 + htab->elf.splt->output_offset
4070 + htab->lazy_plt->plt0_got1_offset);
4071 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4072 R_386_32);
4073 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4074 srelplt2->contents);
4075 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4076 + 8. */
4077 rel.r_offset = (htab->elf.splt->output_section->vma
4078 + htab->elf.splt->output_offset
4079 + htab->lazy_plt->plt0_got2_offset);
4080 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4081 R_386_32);
4082 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4083 srelplt2->contents +
4084 sizeof (Elf32_External_Rel));
4085 /* Correct the .rel.plt.unloaded relocations. */
4086 p = srelplt2->contents;
4087 if (bfd_link_pic (info))
4088 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4089 else
4090 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4091
4092 for (; num_plts; num_plts--)
4093 {
4094 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4095 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4096 R_386_32);
4097 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4098 p += sizeof (Elf32_External_Rel);
4099
4100 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4101 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4102 R_386_32);
4103 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4104 p += sizeof (Elf32_External_Rel);
4105 }
4106 }
4107 }
4108 }
4109 }
4110
4111 /* Fill PLT entries for undefined weak symbols in PIE. */
4112 if (bfd_link_pie (info))
4113 bfd_hash_traverse (&info->hash->table,
4114 elf_i386_pie_finish_undefweak_symbol,
4115 info);
4116
4117 return true;
4118 }
4119
4120 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4121 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4122 It has to be done before elf_link_sort_relocs is called so that
4123 dynamic relocations are properly sorted. */
4124
4125 static bool
4126 elf_i386_output_arch_local_syms
4127 (bfd *output_bfd ATTRIBUTE_UNUSED,
4128 struct bfd_link_info *info,
4129 void *flaginfo ATTRIBUTE_UNUSED,
4130 int (*func) (void *, const char *,
4131 Elf_Internal_Sym *,
4132 asection *,
4133 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4134 {
4135 struct elf_x86_link_hash_table *htab
4136 = elf_x86_hash_table (info, I386_ELF_DATA);
4137 if (htab == NULL)
4138 return false;
4139
4140 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4141 htab_traverse (htab->loc_hash_table,
4142 elf_i386_finish_local_dynamic_symbol,
4143 info);
4144
4145 return true;
4146 }
4147
4148 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4149 dynamic relocations. */
4150
4151 static long
4152 elf_i386_get_synthetic_symtab (bfd *abfd,
4153 long symcount ATTRIBUTE_UNUSED,
4154 asymbol **syms ATTRIBUTE_UNUSED,
4155 long dynsymcount,
4156 asymbol **dynsyms,
4157 asymbol **ret)
4158 {
4159 long count, i, n;
4160 int j;
4161 bfd_byte *plt_contents;
4162 long relsize;
4163 const struct elf_x86_lazy_plt_layout *lazy_plt;
4164 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4165 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4166 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4167 asection *plt;
4168 bfd_vma got_addr;
4169 enum elf_x86_plt_type plt_type;
4170 struct elf_x86_plt plts[] =
4171 {
4172 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4173 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4174 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4175 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4176 };
4177
4178 *ret = NULL;
4179
4180 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4181 return 0;
4182
4183 if (dynsymcount <= 0)
4184 return 0;
4185
4186 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4187 if (relsize <= 0)
4188 return -1;
4189
4190 non_lazy_plt = NULL;
4191 /* Silence GCC 6. */
4192 lazy_plt = NULL;
4193 non_lazy_ibt_plt = NULL;
4194 lazy_ibt_plt = NULL;
4195 switch (get_elf_backend_data (abfd)->target_os)
4196 {
4197 case is_normal:
4198 case is_solaris:
4199 non_lazy_plt = &elf_i386_non_lazy_plt;
4200 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4201 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4202 /* Fall through */
4203 case is_vxworks:
4204 lazy_plt = &elf_i386_lazy_plt;
4205 break;
4206 default:
4207 abort ();
4208 }
4209
4210 got_addr = 0;
4211
4212 count = 0;
4213 for (j = 0; plts[j].name != NULL; j++)
4214 {
4215 plt = bfd_get_section_by_name (abfd, plts[j].name);
4216 if (plt == NULL || plt->size == 0)
4217 continue;
4218
4219 /* Get the PLT section contents. */
4220 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4221 if (plt_contents == NULL)
4222 break;
4223 if (!bfd_get_section_contents (abfd, (asection *) plt,
4224 plt_contents, 0, plt->size))
4225 {
4226 free (plt_contents);
4227 break;
4228 }
4229
4230 /* Check what kind of PLT it is. */
4231 plt_type = plt_unknown;
4232 if (plts[j].type == plt_unknown
4233 && (plt->size >= (lazy_plt->plt0_entry_size
4234 + lazy_plt->plt_entry_size)))
4235 {
4236 /* Match lazy PLT first. */
4237 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4238 lazy_plt->plt0_got1_offset) == 0)
4239 {
4240 /* The fist entry in the lazy IBT PLT is the same as the
4241 normal lazy PLT. */
4242 if (lazy_ibt_plt != NULL
4243 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4244 lazy_ibt_plt->plt_entry,
4245 lazy_ibt_plt->plt_got_offset) == 0))
4246 plt_type = plt_lazy | plt_second;
4247 else
4248 plt_type = plt_lazy;
4249 }
4250 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4251 lazy_plt->plt0_got1_offset) == 0)
4252 {
4253 /* The fist entry in the PIC lazy IBT PLT is the same as
4254 the normal PIC lazy PLT. */
4255 if (lazy_ibt_plt != NULL
4256 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4257 lazy_ibt_plt->pic_plt_entry,
4258 lazy_ibt_plt->plt_got_offset) == 0))
4259 plt_type = plt_lazy | plt_pic | plt_second;
4260 else
4261 plt_type = plt_lazy | plt_pic;
4262 }
4263 }
4264
4265 if (non_lazy_plt != NULL
4266 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4267 && plt->size >= non_lazy_plt->plt_entry_size)
4268 {
4269 /* Match non-lazy PLT. */
4270 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4271 non_lazy_plt->plt_got_offset) == 0)
4272 plt_type = plt_non_lazy;
4273 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4274 non_lazy_plt->plt_got_offset) == 0)
4275 plt_type = plt_pic;
4276 }
4277
4278 if ((non_lazy_ibt_plt != NULL)
4279 && (plt_type == plt_unknown || plt_type == plt_second)
4280 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4281 {
4282 if (memcmp (plt_contents,
4283 non_lazy_ibt_plt->plt_entry,
4284 non_lazy_ibt_plt->plt_got_offset) == 0)
4285 {
4286 /* Match IBT PLT. */
4287 plt_type = plt_second;
4288 non_lazy_plt = non_lazy_ibt_plt;
4289 }
4290 else if (memcmp (plt_contents,
4291 non_lazy_ibt_plt->pic_plt_entry,
4292 non_lazy_ibt_plt->plt_got_offset) == 0)
4293 {
4294 /* Match PIC IBT PLT. */
4295 plt_type = plt_second | plt_pic;
4296 non_lazy_plt = non_lazy_ibt_plt;
4297 }
4298 }
4299
4300 if (plt_type == plt_unknown)
4301 {
4302 free (plt_contents);
4303 continue;
4304 }
4305
4306 plts[j].sec = plt;
4307 plts[j].type = plt_type;
4308
4309 if ((plt_type & plt_lazy))
4310 {
4311 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4312 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4313 /* Skip PLT0 in lazy PLT. */
4314 i = 1;
4315 }
4316 else
4317 {
4318 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4319 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4320 i = 0;
4321 }
4322
4323 /* Skip lazy PLT when the second PLT is used. */
4324 if ((plt_type & (plt_lazy | plt_second))
4325 == (plt_lazy | plt_second))
4326 plts[j].count = 0;
4327 else
4328 {
4329 n = plt->size / plts[j].plt_entry_size;
4330 plts[j].count = n;
4331 count += n - i;
4332 }
4333
4334 plts[j].contents = plt_contents;
4335
4336 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4337 if ((plt_type & plt_pic))
4338 got_addr = (bfd_vma) -1;
4339 }
4340
4341 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4342 got_addr, plts, dynsyms,
4343 ret);
4344 }
4345
4346 /* Set up i386 GNU properties. Return the first relocatable ELF input
4347 with GNU properties if found. Otherwise, return NULL. */
4348
4349 static bfd *
4350 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4351 {
4352 struct elf_x86_init_table init_table;
4353
4354 switch (get_elf_backend_data (info->output_bfd)->target_os)
4355 {
4356 case is_normal:
4357 case is_solaris:
4358 init_table.plt0_pad_byte = 0x0;
4359 init_table.lazy_plt = &elf_i386_lazy_plt;
4360 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4361 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4362 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4363 break;
4364 case is_vxworks:
4365 init_table.plt0_pad_byte = 0x90;
4366 init_table.lazy_plt = &elf_i386_lazy_plt;
4367 init_table.non_lazy_plt = NULL;
4368 init_table.lazy_ibt_plt = NULL;
4369 init_table.non_lazy_ibt_plt = NULL;
4370 break;
4371 default:
4372 abort ();
4373 }
4374
4375 init_table.r_info = elf32_r_info;
4376 init_table.r_sym = elf32_r_sym;
4377
4378 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4379 }
4380
4381 #define TARGET_LITTLE_SYM i386_elf32_vec
4382 #define TARGET_LITTLE_NAME "elf32-i386"
4383 #define ELF_ARCH bfd_arch_i386
4384 #define ELF_TARGET_ID I386_ELF_DATA
4385 #define ELF_MACHINE_CODE EM_386
4386 #define ELF_MAXPAGESIZE 0x1000
4387
4388 #define elf_backend_can_gc_sections 1
4389 #define elf_backend_can_refcount 1
4390 #define elf_backend_want_got_plt 1
4391 #define elf_backend_plt_readonly 1
4392 #define elf_backend_want_plt_sym 0
4393 #define elf_backend_got_header_size 12
4394 #define elf_backend_plt_alignment 4
4395 #define elf_backend_dtrel_excludes_plt 1
4396 #define elf_backend_extern_protected_data 1
4397 #define elf_backend_caches_rawsize 1
4398 #define elf_backend_want_dynrelro 1
4399
4400 /* Support RELA for objdump of prelink objects. */
4401 #define elf_info_to_howto elf_i386_info_to_howto_rel
4402 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4403
4404 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4405 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4406 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4407 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4408
4409 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4410 #define elf_backend_check_relocs elf_i386_check_relocs
4411 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4412 #define elf_backend_fake_sections elf_i386_fake_sections
4413 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4414 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4415 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4416 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4417 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4418 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4419 #define elf_backend_relocate_section elf_i386_relocate_section
4420 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4421 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4422
4423 #define elf_backend_linux_prpsinfo32_ugid16 true
4424
4425 #define elf32_bed elf32_i386_bed
4426
4427 #include "elf32-target.h"
4428
4429 /* FreeBSD support. */
4430
4431 #undef TARGET_LITTLE_SYM
4432 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4433 #undef TARGET_LITTLE_NAME
4434 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4435 #undef ELF_OSABI
4436 #define ELF_OSABI ELFOSABI_FREEBSD
4437
4438 /* The kernel recognizes executables as valid only if they carry a
4439 "FreeBSD" label in the ELF header. So we put this label on all
4440 executables and (for simplicity) also all other object files. */
4441
4442 static bool
4443 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4444 {
4445 if (!_bfd_elf_init_file_header (abfd, info))
4446 return false;
4447
4448 #ifdef OLD_FREEBSD_ABI_LABEL
4449 {
4450 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4451 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4452 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4453 }
4454 #endif
4455 return true;
4456 }
4457
4458 #undef elf_backend_init_file_header
4459 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4460 #undef elf32_bed
4461 #define elf32_bed elf32_i386_fbsd_bed
4462
4463 #undef elf_backend_add_symbol_hook
4464
4465 #include "elf32-target.h"
4466
4467 #undef elf_backend_init_file_header
4468
4469 /* Solaris 2. */
4470
4471 #undef TARGET_LITTLE_SYM
4472 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4473 #undef TARGET_LITTLE_NAME
4474 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4475
4476 #undef ELF_TARGET_OS
4477 #define ELF_TARGET_OS is_solaris
4478
4479 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4480 objects won't be recognized. */
4481 #undef ELF_OSABI
4482
4483 #undef elf32_bed
4484 #define elf32_bed elf32_i386_sol2_bed
4485
4486 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4487 boundary. */
4488 #undef elf_backend_static_tls_alignment
4489 #define elf_backend_static_tls_alignment 8
4490
4491 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4492
4493 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4494 File, p.63. */
4495 #undef elf_backend_want_plt_sym
4496 #define elf_backend_want_plt_sym 1
4497
4498 #undef elf_backend_strtab_flags
4499 #define elf_backend_strtab_flags SHF_STRINGS
4500
4501 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4502 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4503 FALSE otherwise. ISECTION is the best guess matching section from the
4504 input bfd IBFD, but it might be NULL. */
4505
4506 static bool
4507 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4508 bfd *obfd ATTRIBUTE_UNUSED,
4509 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4510 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4511 {
4512 /* PR 19938: FIXME: Need to add code for setting the sh_info
4513 and sh_link fields of Solaris specific section types. */
4514 return false;
4515
4516 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4517 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4518
4519 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4520
4521 The following values should be set:
4522
4523 Type Link Info
4524 -----------------------------------------------------------------------------
4525 SHT_SUNW_ancillary The section header index of 0
4526 [0x6fffffee] the associated string table.
4527
4528 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4529 [0x6ffffff0] the associated symbol table. section header index of
4530 the associated
4531 SHT_SUNW_capchain table,
4532 otherwise 0.
4533
4534 SHT_SUNW_symsort The section header index of 0
4535 [0x6ffffff1] the associated symbol table.
4536
4537 SHT_SUNW_tlssort The section header index of 0
4538 [0x6ffffff2] the associated symbol table.
4539
4540 SHT_SUNW_LDYNSYM The section header index of One greater than the
4541 [0x6ffffff3] the associated string table. symbol table index of the
4542 This index is the same string last local symbol,
4543 table used by the SHT_DYNSYM STB_LOCAL. Since
4544 section. SHT_SUNW_LDYNSYM only
4545 contains local symbols,
4546 sh_info is equivalent to
4547 the number of symbols in
4548 the table.
4549
4550 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4551 [0x6ffffff5] the section header index of to named strings, the
4552 the associated section header index of
4553 SHT_SUNW_capinfo table, the associated string
4554 otherwise 0. table, otherwise 0.
4555
4556 SHT_SUNW_move The section header index of 0
4557 [0x6ffffffa] the associated symbol table.
4558
4559 SHT_SUNW_COMDAT 0 0
4560 [0x6ffffffb]
4561
4562 SHT_SUNW_syminfo The section header index of The section header index
4563 [0x6ffffffc] the associated symbol table. of the associated
4564 .dynamic section.
4565
4566 SHT_SUNW_verdef The section header index of The number of version
4567 [0x6ffffffd] the associated string table. definitions within the
4568 section.
4569
4570 SHT_SUNW_verneed The section header index of The number of version
4571 [0x6ffffffe] the associated string table. dependencies within the
4572 section.
4573
4574 SHT_SUNW_versym The section header index of 0
4575 [0x6fffffff] the associated symbol table. */
4576 }
4577
4578 #undef elf_backend_copy_special_section_fields
4579 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4580
4581 #include "elf32-target.h"
4582
4583 /* Intel MCU support. */
4584
4585 static bool
4586 elf32_iamcu_elf_object_p (bfd *abfd)
4587 {
4588 /* Set the right machine number for an IAMCU elf32 file. */
4589 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4590 return true;
4591 }
4592
4593 #undef TARGET_LITTLE_SYM
4594 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4595 #undef TARGET_LITTLE_NAME
4596 #define TARGET_LITTLE_NAME "elf32-iamcu"
4597 #undef ELF_ARCH
4598 #define ELF_ARCH bfd_arch_iamcu
4599
4600 #undef ELF_MACHINE_CODE
4601 #define ELF_MACHINE_CODE EM_IAMCU
4602
4603 #undef ELF_TARGET_OS
4604 #undef ELF_OSABI
4605
4606 #undef elf32_bed
4607 #define elf32_bed elf32_iamcu_bed
4608
4609 #undef elf_backend_object_p
4610 #define elf_backend_object_p elf32_iamcu_elf_object_p
4611
4612 #undef elf_backend_static_tls_alignment
4613
4614 #undef elf_backend_want_plt_sym
4615 #define elf_backend_want_plt_sym 0
4616
4617 #undef elf_backend_strtab_flags
4618 #undef elf_backend_copy_special_section_fields
4619
4620 #include "elf32-target.h"
4621
4622 /* Restore defaults. */
4623 #undef ELF_ARCH
4624 #define ELF_ARCH bfd_arch_i386
4625 #undef ELF_MACHINE_CODE
4626 #define ELF_MACHINE_CODE EM_386
4627 #undef elf_backend_object_p
4628
4629 /* VxWorks support. */
4630
4631 #undef TARGET_LITTLE_SYM
4632 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4633 #undef TARGET_LITTLE_NAME
4634 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4635 #undef ELF_OSABI
4636 #undef ELF_MAXPAGESIZE
4637 #define ELF_MAXPAGESIZE 0x1000
4638 #undef elf_backend_plt_alignment
4639 #define elf_backend_plt_alignment 4
4640
4641 #undef ELF_TARGET_OS
4642 #define ELF_TARGET_OS is_vxworks
4643
4644 #undef elf_backend_relocs_compatible
4645 #undef elf_backend_add_symbol_hook
4646 #define elf_backend_add_symbol_hook \
4647 elf_vxworks_add_symbol_hook
4648 #undef elf_backend_link_output_symbol_hook
4649 #define elf_backend_link_output_symbol_hook \
4650 elf_vxworks_link_output_symbol_hook
4651 #undef elf_backend_emit_relocs
4652 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4653 #undef elf_backend_final_write_processing
4654 #define elf_backend_final_write_processing \
4655 elf_vxworks_final_write_processing
4656 #undef elf_backend_static_tls_alignment
4657
4658 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4659 define it. */
4660 #undef elf_backend_want_plt_sym
4661 #define elf_backend_want_plt_sym 1
4662
4663 #undef elf32_bed
4664 #define elf32_bed elf32_i386_vxworks_bed
4665
4666 #include "elf32-target.h"