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Make bfd_byte an int8_t, flagword a uint32_t
[binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2023 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 static reloc_howto_type elf_howto_table[]=
30 {
31 HOWTO(R_386_NONE, 0, 0, 0, false, 0, complain_overflow_dont,
32 bfd_elf_generic_reloc, "R_386_NONE",
33 true, 0x00000000, 0x00000000, false),
34 HOWTO(R_386_32, 0, 4, 32, false, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_32",
36 true, 0xffffffff, 0xffffffff, false),
37 HOWTO(R_386_PC32, 0, 4, 32, true, 0, complain_overflow_dont,
38 bfd_elf_generic_reloc, "R_386_PC32",
39 true, 0xffffffff, 0xffffffff, true),
40 HOWTO(R_386_GOT32, 0, 4, 32, false, 0, complain_overflow_dont,
41 bfd_elf_generic_reloc, "R_386_GOT32",
42 true, 0xffffffff, 0xffffffff, false),
43 HOWTO(R_386_PLT32, 0, 4, 32, true, 0, complain_overflow_dont,
44 bfd_elf_generic_reloc, "R_386_PLT32",
45 true, 0xffffffff, 0xffffffff, true),
46 HOWTO(R_386_COPY, 0, 4, 32, false, 0, complain_overflow_dont,
47 bfd_elf_generic_reloc, "R_386_COPY",
48 true, 0xffffffff, 0xffffffff, false),
49 HOWTO(R_386_GLOB_DAT, 0, 4, 32, false, 0, complain_overflow_dont,
50 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
51 true, 0xffffffff, 0xffffffff, false),
52 HOWTO(R_386_JUMP_SLOT, 0, 4, 32, false, 0, complain_overflow_dont,
53 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
54 true, 0xffffffff, 0xffffffff, false),
55 HOWTO(R_386_RELATIVE, 0, 4, 32, false, 0, complain_overflow_dont,
56 bfd_elf_generic_reloc, "R_386_RELATIVE",
57 true, 0xffffffff, 0xffffffff, false),
58 HOWTO(R_386_GOTOFF, 0, 4, 32, false, 0, complain_overflow_dont,
59 bfd_elf_generic_reloc, "R_386_GOTOFF",
60 true, 0xffffffff, 0xffffffff, false),
61 HOWTO(R_386_GOTPC, 0, 4, 32, true, 0, complain_overflow_dont,
62 bfd_elf_generic_reloc, "R_386_GOTPC",
63 true, 0xffffffff, 0xffffffff, true),
64
65 /* We have a gap in the reloc numbers here.
66 R_386_standard counts the number up to this point, and
67 R_386_ext_offset is the value to subtract from a reloc type of
68 R_386_16 thru R_386_PC8 to form an index into this table. */
69 #define R_386_standard (R_386_GOTPC + 1)
70 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
71
72 /* These relocs are a GNU extension. */
73 HOWTO(R_386_TLS_TPOFF, 0, 4, 32, false, 0, complain_overflow_dont,
74 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
75 true, 0xffffffff, 0xffffffff, false),
76 HOWTO(R_386_TLS_IE, 0, 4, 32, false, 0, complain_overflow_dont,
77 bfd_elf_generic_reloc, "R_386_TLS_IE",
78 true, 0xffffffff, 0xffffffff, false),
79 HOWTO(R_386_TLS_GOTIE, 0, 4, 32, false, 0, complain_overflow_dont,
80 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
81 true, 0xffffffff, 0xffffffff, false),
82 HOWTO(R_386_TLS_LE, 0, 4, 32, false, 0, complain_overflow_dont,
83 bfd_elf_generic_reloc, "R_386_TLS_LE",
84 true, 0xffffffff, 0xffffffff, false),
85 HOWTO(R_386_TLS_GD, 0, 4, 32, false, 0, complain_overflow_dont,
86 bfd_elf_generic_reloc, "R_386_TLS_GD",
87 true, 0xffffffff, 0xffffffff, false),
88 HOWTO(R_386_TLS_LDM, 0, 4, 32, false, 0, complain_overflow_dont,
89 bfd_elf_generic_reloc, "R_386_TLS_LDM",
90 true, 0xffffffff, 0xffffffff, false),
91 HOWTO(R_386_16, 0, 2, 16, false, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_16",
93 true, 0xffff, 0xffff, false),
94 HOWTO(R_386_PC16, 0, 2, 16, true, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_PC16",
96 true, 0xffff, 0xffff, true),
97 HOWTO(R_386_8, 0, 1, 8, false, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_8",
99 true, 0xff, 0xff, false),
100 HOWTO(R_386_PC8, 0, 1, 8, true, 0, complain_overflow_signed,
101 bfd_elf_generic_reloc, "R_386_PC8",
102 true, 0xff, 0xff, true),
103
104 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
105 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
106 /* These are common with Solaris TLS implementation. */
107 HOWTO(R_386_TLS_LDO_32, 0, 4, 32, false, 0, complain_overflow_dont,
108 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
109 true, 0xffffffff, 0xffffffff, false),
110 HOWTO(R_386_TLS_IE_32, 0, 4, 32, false, 0, complain_overflow_dont,
111 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
112 true, 0xffffffff, 0xffffffff, false),
113 HOWTO(R_386_TLS_LE_32, 0, 4, 32, false, 0, complain_overflow_dont,
114 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
115 true, 0xffffffff, 0xffffffff, false),
116 HOWTO(R_386_TLS_DTPMOD32, 0, 4, 32, false, 0, complain_overflow_dont,
117 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
118 true, 0xffffffff, 0xffffffff, false),
119 HOWTO(R_386_TLS_DTPOFF32, 0, 4, 32, false, 0, complain_overflow_dont,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
121 true, 0xffffffff, 0xffffffff, false),
122 HOWTO(R_386_TLS_TPOFF32, 0, 4, 32, false, 0, complain_overflow_dont,
123 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
124 true, 0xffffffff, 0xffffffff, false),
125 HOWTO(R_386_SIZE32, 0, 4, 32, false, 0, complain_overflow_dont,
126 bfd_elf_generic_reloc, "R_386_SIZE32",
127 true, 0xffffffff, 0xffffffff, false),
128 HOWTO(R_386_TLS_GOTDESC, 0, 4, 32, false, 0, complain_overflow_dont,
129 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
130 true, 0xffffffff, 0xffffffff, false),
131 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, false, 0, complain_overflow_dont,
132 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
133 false, 0, 0, false),
134 HOWTO(R_386_TLS_DESC, 0, 4, 32, false, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC",
136 true, 0xffffffff, 0xffffffff, false),
137 HOWTO(R_386_IRELATIVE, 0, 4, 32, false, 0, complain_overflow_dont,
138 bfd_elf_generic_reloc, "R_386_IRELATIVE",
139 true, 0xffffffff, 0xffffffff, false),
140 HOWTO(R_386_GOT32X, 0, 4, 32, false, 0, complain_overflow_dont,
141 bfd_elf_generic_reloc, "R_386_GOT32X",
142 true, 0xffffffff, 0xffffffff, false),
143
144 /* Another gap. */
145 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
146 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
147
148 /* GNU extension to record C++ vtable hierarchy. */
149 HOWTO (R_386_GNU_VTINHERIT, /* type */
150 0, /* rightshift */
151 4, /* size */
152 0, /* bitsize */
153 false, /* pc_relative */
154 0, /* bitpos */
155 complain_overflow_dont, /* complain_on_overflow */
156 NULL, /* special_function */
157 "R_386_GNU_VTINHERIT", /* name */
158 false, /* partial_inplace */
159 0, /* src_mask */
160 0, /* dst_mask */
161 false), /* pcrel_offset */
162
163 /* GNU extension to record C++ vtable member usage. */
164 HOWTO (R_386_GNU_VTENTRY, /* type */
165 0, /* rightshift */
166 4, /* size */
167 0, /* bitsize */
168 false, /* pc_relative */
169 0, /* bitpos */
170 complain_overflow_dont, /* complain_on_overflow */
171 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
172 "R_386_GNU_VTENTRY", /* name */
173 false, /* partial_inplace */
174 0, /* src_mask */
175 0, /* dst_mask */
176 false) /* pcrel_offset */
177
178 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
179
180 };
181
182 #ifdef DEBUG_GEN_RELOC
183 #define TRACE(str) \
184 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
185 #else
186 #define TRACE(str)
187 #endif
188
189 static reloc_howto_type *
190 elf_i386_reloc_type_lookup (bfd *abfd,
191 bfd_reloc_code_real_type code)
192 {
193 switch (code)
194 {
195 case BFD_RELOC_NONE:
196 TRACE ("BFD_RELOC_NONE");
197 return &elf_howto_table[R_386_NONE];
198
199 case BFD_RELOC_32:
200 TRACE ("BFD_RELOC_32");
201 return &elf_howto_table[R_386_32];
202
203 case BFD_RELOC_CTOR:
204 TRACE ("BFD_RELOC_CTOR");
205 return &elf_howto_table[R_386_32];
206
207 case BFD_RELOC_32_PCREL:
208 TRACE ("BFD_RELOC_PC32");
209 return &elf_howto_table[R_386_PC32];
210
211 case BFD_RELOC_386_GOT32:
212 TRACE ("BFD_RELOC_386_GOT32");
213 return &elf_howto_table[R_386_GOT32];
214
215 case BFD_RELOC_386_PLT32:
216 TRACE ("BFD_RELOC_386_PLT32");
217 return &elf_howto_table[R_386_PLT32];
218
219 case BFD_RELOC_386_COPY:
220 TRACE ("BFD_RELOC_386_COPY");
221 return &elf_howto_table[R_386_COPY];
222
223 case BFD_RELOC_386_GLOB_DAT:
224 TRACE ("BFD_RELOC_386_GLOB_DAT");
225 return &elf_howto_table[R_386_GLOB_DAT];
226
227 case BFD_RELOC_386_JUMP_SLOT:
228 TRACE ("BFD_RELOC_386_JUMP_SLOT");
229 return &elf_howto_table[R_386_JUMP_SLOT];
230
231 case BFD_RELOC_386_RELATIVE:
232 TRACE ("BFD_RELOC_386_RELATIVE");
233 return &elf_howto_table[R_386_RELATIVE];
234
235 case BFD_RELOC_386_GOTOFF:
236 TRACE ("BFD_RELOC_386_GOTOFF");
237 return &elf_howto_table[R_386_GOTOFF];
238
239 case BFD_RELOC_386_GOTPC:
240 TRACE ("BFD_RELOC_386_GOTPC");
241 return &elf_howto_table[R_386_GOTPC];
242
243 /* These relocs are a GNU extension. */
244 case BFD_RELOC_386_TLS_TPOFF:
245 TRACE ("BFD_RELOC_386_TLS_TPOFF");
246 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
247
248 case BFD_RELOC_386_TLS_IE:
249 TRACE ("BFD_RELOC_386_TLS_IE");
250 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
251
252 case BFD_RELOC_386_TLS_GOTIE:
253 TRACE ("BFD_RELOC_386_TLS_GOTIE");
254 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
255
256 case BFD_RELOC_386_TLS_LE:
257 TRACE ("BFD_RELOC_386_TLS_LE");
258 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
259
260 case BFD_RELOC_386_TLS_GD:
261 TRACE ("BFD_RELOC_386_TLS_GD");
262 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
263
264 case BFD_RELOC_386_TLS_LDM:
265 TRACE ("BFD_RELOC_386_TLS_LDM");
266 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
267
268 case BFD_RELOC_16:
269 TRACE ("BFD_RELOC_16");
270 return &elf_howto_table[R_386_16 - R_386_ext_offset];
271
272 case BFD_RELOC_16_PCREL:
273 TRACE ("BFD_RELOC_16_PCREL");
274 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
275
276 case BFD_RELOC_8:
277 TRACE ("BFD_RELOC_8");
278 return &elf_howto_table[R_386_8 - R_386_ext_offset];
279
280 case BFD_RELOC_8_PCREL:
281 TRACE ("BFD_RELOC_8_PCREL");
282 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
283
284 /* Common with Sun TLS implementation. */
285 case BFD_RELOC_386_TLS_LDO_32:
286 TRACE ("BFD_RELOC_386_TLS_LDO_32");
287 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
288
289 case BFD_RELOC_386_TLS_IE_32:
290 TRACE ("BFD_RELOC_386_TLS_IE_32");
291 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
292
293 case BFD_RELOC_386_TLS_LE_32:
294 TRACE ("BFD_RELOC_386_TLS_LE_32");
295 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
296
297 case BFD_RELOC_386_TLS_DTPMOD32:
298 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
299 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
300
301 case BFD_RELOC_386_TLS_DTPOFF32:
302 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
303 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
304
305 case BFD_RELOC_386_TLS_TPOFF32:
306 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
307 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
308
309 case BFD_RELOC_SIZE32:
310 TRACE ("BFD_RELOC_SIZE32");
311 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
312
313 case BFD_RELOC_386_TLS_GOTDESC:
314 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
315 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
316
317 case BFD_RELOC_386_TLS_DESC_CALL:
318 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
319 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
320
321 case BFD_RELOC_386_TLS_DESC:
322 TRACE ("BFD_RELOC_386_TLS_DESC");
323 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
324
325 case BFD_RELOC_386_IRELATIVE:
326 TRACE ("BFD_RELOC_386_IRELATIVE");
327 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
328
329 case BFD_RELOC_386_GOT32X:
330 TRACE ("BFD_RELOC_386_GOT32X");
331 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
332
333 case BFD_RELOC_VTABLE_INHERIT:
334 TRACE ("BFD_RELOC_VTABLE_INHERIT");
335 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
336
337 case BFD_RELOC_VTABLE_ENTRY:
338 TRACE ("BFD_RELOC_VTABLE_ENTRY");
339 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
340
341 default:
342 TRACE ("Unknown");
343 /* xgettext:c-format */
344 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
345 abfd, (int) code);
346 bfd_set_error (bfd_error_bad_value);
347 return NULL;
348 }
349 }
350
351 static reloc_howto_type *
352 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
353 const char *r_name)
354 {
355 unsigned int i;
356
357 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
358 if (elf_howto_table[i].name != NULL
359 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
360 return &elf_howto_table[i];
361
362 return NULL;
363 }
364
365 static reloc_howto_type *
366 elf_i386_rtype_to_howto (unsigned r_type)
367 {
368 unsigned int indx;
369
370 if ((indx = r_type) >= R_386_standard
371 && ((indx = r_type - R_386_ext_offset) - R_386_standard
372 >= R_386_ext - R_386_standard)
373 && ((indx = r_type - R_386_tls_offset) - R_386_ext
374 >= R_386_ext2 - R_386_ext)
375 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
376 >= R_386_vt - R_386_ext2))
377 return NULL;
378 /* PR 17512: file: 0f67f69d. */
379 if (elf_howto_table [indx].type != r_type)
380 return NULL;
381 return &elf_howto_table[indx];
382 }
383
384 static bool
385 elf_i386_info_to_howto_rel (bfd *abfd,
386 arelent *cache_ptr,
387 Elf_Internal_Rela *dst)
388 {
389 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
390
391 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
392 {
393 /* xgettext:c-format */
394 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
395 abfd, r_type);
396 bfd_set_error (bfd_error_bad_value);
397 return false;
398 }
399
400 return true;
401 }
402
403 /* Return whether a symbol name implies a local label. The UnixWare
404 2.1 cc generates temporary symbols that start with .X, so we
405 recognize them here. FIXME: do other SVR4 compilers also use .X?.
406 If so, we should move the .X recognition into
407 _bfd_elf_is_local_label_name. */
408
409 static bool
410 elf_i386_is_local_label_name (bfd *abfd, const char *name)
411 {
412 if (name[0] == '.' && name[1] == 'X')
413 return true;
414
415 return _bfd_elf_is_local_label_name (abfd, name);
416 }
417 \f
418 /* Support for core dump NOTE sections. */
419
420 static bool
421 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
422 {
423 int offset;
424 size_t size;
425
426 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
427 {
428 int pr_version = bfd_get_32 (abfd, note->descdata);
429
430 if (pr_version != 1)
431 return false;
432
433 /* pr_cursig */
434 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
435
436 /* pr_pid */
437 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
438
439 /* pr_reg */
440 offset = 28;
441 size = bfd_get_32 (abfd, note->descdata + 8);
442 }
443 else
444 {
445 switch (note->descsz)
446 {
447 default:
448 return false;
449
450 case 144: /* Linux/i386 */
451 /* pr_cursig */
452 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
453
454 /* pr_pid */
455 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
456
457 /* pr_reg */
458 offset = 72;
459 size = 68;
460
461 break;
462 }
463 }
464
465 /* Make a ".reg/999" section. */
466 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
467 size, note->descpos + offset);
468 }
469
470 static bool
471 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
472 {
473 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
474 {
475 int pr_version = bfd_get_32 (abfd, note->descdata);
476
477 if (pr_version != 1)
478 return false;
479
480 elf_tdata (abfd)->core->program
481 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
482 elf_tdata (abfd)->core->command
483 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
484 }
485 else
486 {
487 switch (note->descsz)
488 {
489 default:
490 return false;
491
492 case 124: /* Linux/i386 elf_prpsinfo. */
493 elf_tdata (abfd)->core->pid
494 = bfd_get_32 (abfd, note->descdata + 12);
495 elf_tdata (abfd)->core->program
496 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
497 elf_tdata (abfd)->core->command
498 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
499 }
500 }
501
502 /* Note that for some reason, a spurious space is tacked
503 onto the end of the args in some (at least one anyway)
504 implementations, so strip it off if it exists. */
505 {
506 char *command = elf_tdata (abfd)->core->command;
507 int n = strlen (command);
508
509 if (0 < n && command[n - 1] == ' ')
510 command[n - 1] = '\0';
511 }
512
513 return true;
514 }
515 \f
516 /* Functions for the i386 ELF linker.
517
518 In order to gain some understanding of code in this file without
519 knowing all the intricate details of the linker, note the
520 following:
521
522 Functions named elf_i386_* are called by external routines, other
523 functions are only called locally. elf_i386_* functions appear
524 in this file more or less in the order in which they are called
525 from external routines. eg. elf_i386_scan_relocs is called
526 early in the link process, elf_i386_finish_dynamic_sections is
527 one of the last functions. */
528
529 /* The size in bytes of an entry in the lazy procedure linkage table. */
530
531 #define LAZY_PLT_ENTRY_SIZE 16
532
533 /* The size in bytes of an entry in the non-lazy procedure linkage
534 table. */
535
536 #define NON_LAZY_PLT_ENTRY_SIZE 8
537
538 /* The first entry in an absolute lazy procedure linkage table looks
539 like this. See the SVR4 ABI i386 supplement to see how this works.
540 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
541
542 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
543 {
544 0xff, 0x35, /* pushl contents of address */
545 0, 0, 0, 0, /* replaced with address of .got + 4. */
546 0xff, 0x25, /* jmp indirect */
547 0, 0, 0, 0 /* replaced with address of .got + 8. */
548 };
549
550 /* Subsequent entries in an absolute lazy procedure linkage table look
551 like this. */
552
553 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
554 {
555 0xff, 0x25, /* jmp indirect */
556 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
557 0x68, /* pushl immediate */
558 0, 0, 0, 0, /* replaced with offset into relocation table. */
559 0xe9, /* jmp relative */
560 0, 0, 0, 0 /* replaced with offset to start of .plt. */
561 };
562
563 /* The first entry in a PIC lazy procedure linkage table look like
564 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
565 lazy_plt->plt0_pad_byte. */
566
567 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
568 {
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
571 };
572
573 /* Subsequent entries in a PIC lazy procedure linkage table look like
574 this. */
575
576 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
577 {
578 0xff, 0xa3, /* jmp *offset(%ebx) */
579 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
580 0x68, /* pushl immediate */
581 0, 0, 0, 0, /* replaced with offset into relocation table. */
582 0xe9, /* jmp relative */
583 0, 0, 0, 0 /* replaced with offset to start of .plt. */
584 };
585
586 /* Entries in the non-lazy procedure linkage table look like this. */
587
588 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
589 {
590 0xff, 0x25, /* jmp indirect */
591 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
592 0x66, 0x90 /* xchg %ax,%ax */
593 };
594
595 /* Entries in the PIC non-lazy procedure linkage table look like
596 this. */
597
598 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
599 {
600 0xff, 0xa3, /* jmp *offset(%ebx) */
601 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
602 0x66, 0x90 /* xchg %ax,%ax */
603 };
604
605 /* The first entry in an absolute IBT-enabled lazy procedure linkage
606 table looks like this. */
607
608 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
609 {
610 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
611 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
612 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
613 };
614
615 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
616 table look like this. Subsequent entries for a PIC IBT-enabled lazy
617 procedure linkage table are the same. */
618
619 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
620 {
621 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
622 0x68, 0, 0, 0, 0, /* pushl immediate */
623 0xe9, 0, 0, 0, 0, /* jmp relative */
624 0x66, 0x90 /* xchg %ax,%ax */
625 };
626
627 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
628 look like. */
629
630 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
631 {
632 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
633 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
634 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
635 };
636
637 /* Entries for branches with IBT-enabled in the absolute non-lazey
638 procedure linkage table look like this. They have the same size
639 as the lazy PLT entry. */
640
641 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
642 {
643 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
644 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
645 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
646 };
647
648 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
649 linkage table look like this. They have the same size as the lazy
650 PLT entry. */
651
652 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
653 {
654 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
655 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
656 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
657 };
658
659 /* .eh_frame covering the lazy .plt section. */
660
661 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
662 {
663 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
664 0, 0, 0, 0, /* CIE ID */
665 1, /* CIE version */
666 'z', 'R', 0, /* Augmentation string */
667 1, /* Code alignment factor */
668 0x7c, /* Data alignment factor */
669 8, /* Return address column */
670 1, /* Augmentation size */
671 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
672 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
673 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
674 DW_CFA_nop, DW_CFA_nop,
675
676 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
677 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
678 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
679 0, 0, 0, 0, /* .plt size goes here */
680 0, /* Augmentation size */
681 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
682 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
683 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
684 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
685 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
686 11, /* Block length */
687 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
688 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
689 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
690 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
691 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
692 };
693
694 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
695
696 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
697 {
698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
699 0, 0, 0, 0, /* CIE ID */
700 1, /* CIE version */
701 'z', 'R', 0, /* Augmentation string */
702 1, /* Code alignment factor */
703 0x7c, /* Data alignment factor */
704 8, /* Return address column */
705 1, /* Augmentation size */
706 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
707 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
708 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
709 DW_CFA_nop, DW_CFA_nop,
710
711 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
712 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
713 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
714 0, 0, 0, 0, /* .plt size goes here */
715 0, /* Augmentation size */
716 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
717 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
718 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
719 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
720 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
721 11, /* Block length */
722 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
723 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
724 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
725 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
726 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
727 };
728
729 /* .eh_frame covering the non-lazy .plt section. */
730
731 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
732 {
733 #define PLT_GOT_FDE_LENGTH 16
734 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
735 0, 0, 0, 0, /* CIE ID */
736 1, /* CIE version */
737 'z', 'R', 0, /* Augmentation string */
738 1, /* Code alignment factor */
739 0x7c, /* Data alignment factor */
740 8, /* Return address column */
741 1, /* Augmentation size */
742 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
743 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
744 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
745 DW_CFA_nop, DW_CFA_nop,
746
747 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
748 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
749 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
750 0, 0, 0, 0, /* non-lazy .plt size goes here */
751 0, /* Augmentation size */
752 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
753 };
754
755 /* These are the standard parameters. */
756 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
757 {
758 elf_i386_lazy_plt0_entry, /* plt0_entry */
759 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
760 elf_i386_lazy_plt_entry, /* plt_entry */
761 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
762 NULL, /* plt_tlsdesc_entry */
763 0, /* plt_tlsdesc_entry_size*/
764 0, /* plt_tlsdesc_got1_offset */
765 0, /* plt_tlsdesc_got2_offset */
766 0, /* plt_tlsdesc_got1_insn_end */
767 0, /* plt_tlsdesc_got2_insn_end */
768 2, /* plt0_got1_offset */
769 8, /* plt0_got2_offset */
770 0, /* plt0_got2_insn_end */
771 2, /* plt_got_offset */
772 7, /* plt_reloc_offset */
773 12, /* plt_plt_offset */
774 0, /* plt_got_insn_size */
775 0, /* plt_plt_insn_end */
776 6, /* plt_lazy_offset */
777 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
778 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
779 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
780 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
781 };
782
783 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
784 {
785 elf_i386_non_lazy_plt_entry, /* plt_entry */
786 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
787 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
788 2, /* plt_got_offset */
789 0, /* plt_got_insn_size */
790 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
791 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
792 };
793
794 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
795 {
796 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
797 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
798 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
799 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
800 NULL, /* plt_tlsdesc_entry */
801 0, /* plt_tlsdesc_entry_size*/
802 0, /* plt_tlsdesc_got1_offset */
803 0, /* plt_tlsdesc_got2_offset */
804 0, /* plt_tlsdesc_got1_insn_end */
805 0, /* plt_tlsdesc_got2_insn_end */
806 2, /* plt0_got1_offset */
807 8, /* plt0_got2_offset */
808 0, /* plt0_got2_insn_end */
809 4+2, /* plt_got_offset */
810 4+1, /* plt_reloc_offset */
811 4+6, /* plt_plt_offset */
812 0, /* plt_got_insn_size */
813 0, /* plt_plt_insn_end */
814 0, /* plt_lazy_offset */
815 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
816 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
817 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
818 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
819 };
820
821 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
822 {
823 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
824 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
825 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
826 4+2, /* plt_got_offset */
827 0, /* plt_got_insn_size */
828 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
829 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
830 };
831 \f
832
833 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
834 for the PLTResolve stub and then for each PLT entry. */
835 #define PLTRESOLVE_RELOCS_SHLIB 0
836 #define PLTRESOLVE_RELOCS 2
837 #define PLT_NON_JUMP_SLOT_RELOCS 2
838
839 /* Return TRUE if the TLS access code sequence support transition
840 from R_TYPE. */
841
842 static bool
843 elf_i386_check_tls_transition (asection *sec,
844 bfd_byte *contents,
845 Elf_Internal_Shdr *symtab_hdr,
846 struct elf_link_hash_entry **sym_hashes,
847 unsigned int r_type,
848 const Elf_Internal_Rela *rel,
849 const Elf_Internal_Rela *relend)
850 {
851 unsigned int val, type, reg;
852 unsigned long r_symndx;
853 struct elf_link_hash_entry *h;
854 bfd_vma offset;
855 bfd_byte *call;
856 bool indirect_call;
857
858 offset = rel->r_offset;
859 switch (r_type)
860 {
861 case R_386_TLS_GD:
862 case R_386_TLS_LDM:
863 if (offset < 2 || (rel + 1) >= relend)
864 return false;
865
866 indirect_call = false;
867 call = contents + offset + 4;
868 val = *(call - 5);
869 type = *(call - 6);
870 if (r_type == R_386_TLS_GD)
871 {
872 /* Check transition from GD access model. Only
873 leal foo@tlsgd(,%ebx,1), %eax
874 call ___tls_get_addr@PLT
875 or
876 leal foo@tlsgd(%ebx) %eax
877 call ___tls_get_addr@PLT
878 nop
879 or
880 leal foo@tlsgd(%reg), %eax
881 call *___tls_get_addr@GOT(%reg)
882 which may be converted to
883 addr32 call ___tls_get_addr
884 can transit to different access model. */
885 if ((offset + 10) > sec->size
886 || (type != 0x8d && type != 0x04))
887 return false;
888
889 if (type == 0x04)
890 {
891 /* leal foo@tlsgd(,%ebx,1), %eax
892 call ___tls_get_addr@PLT */
893 if (offset < 3)
894 return false;
895
896 if (*(call - 7) != 0x8d
897 || val != 0x1d
898 || call[0] != 0xe8)
899 return false;
900 }
901 else
902 {
903 /* This must be
904 leal foo@tlsgd(%ebx), %eax
905 call ___tls_get_addr@PLT
906 nop
907 or
908 leal foo@tlsgd(%reg), %eax
909 call *___tls_get_addr@GOT(%reg)
910 which may be converted to
911 addr32 call ___tls_get_addr
912
913 %eax can't be used as the GOT base register since it
914 is used to pass parameter to ___tls_get_addr. */
915 reg = val & 7;
916 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
917 return false;
918
919 indirect_call = call[0] == 0xff;
920 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
921 && !(call[0] == 0x67 && call[1] == 0xe8)
922 && !(indirect_call
923 && (call[1] & 0xf8) == 0x90
924 && (call[1] & 0x7) == reg))
925 return false;
926 }
927 }
928 else
929 {
930 /* Check transition from LD access model. Only
931 leal foo@tlsldm(%ebx), %eax
932 call ___tls_get_addr@PLT
933 or
934 leal foo@tlsldm(%reg), %eax
935 call *___tls_get_addr@GOT(%reg)
936 which may be converted to
937 addr32 call ___tls_get_addr
938 can transit to different access model. */
939 if (type != 0x8d || (offset + 9) > sec->size)
940 return false;
941
942 /* %eax can't be used as the GOT base register since it is
943 used to pass parameter to ___tls_get_addr. */
944 reg = val & 7;
945 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
946 return false;
947
948 indirect_call = call[0] == 0xff;
949 if (!(reg == 3 && call[0] == 0xe8)
950 && !(call[0] == 0x67 && call[1] == 0xe8)
951 && !(indirect_call
952 && (call[1] & 0xf8) == 0x90
953 && (call[1] & 0x7) == reg))
954 return false;
955 }
956
957 r_symndx = ELF32_R_SYM (rel[1].r_info);
958 if (r_symndx < symtab_hdr->sh_info)
959 return false;
960
961 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
962 if (h == NULL
963 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
964 return false;
965 else if (indirect_call)
966 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X
967 || ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32);
968 else
969 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
970 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
971
972 case R_386_TLS_IE:
973 /* Check transition from IE access model:
974 movl foo@indntpoff(%rip), %eax
975 movl foo@indntpoff(%rip), %reg
976 addl foo@indntpoff(%rip), %reg
977 */
978
979 if (offset < 1 || (offset + 4) > sec->size)
980 return false;
981
982 /* Check "movl foo@tpoff(%rip), %eax" first. */
983 val = bfd_get_8 (abfd, contents + offset - 1);
984 if (val == 0xa1)
985 return true;
986
987 if (offset < 2)
988 return false;
989
990 /* Check movl|addl foo@tpoff(%rip), %reg. */
991 type = bfd_get_8 (abfd, contents + offset - 2);
992 return ((type == 0x8b || type == 0x03)
993 && (val & 0xc7) == 0x05);
994
995 case R_386_TLS_GOTIE:
996 case R_386_TLS_IE_32:
997 /* Check transition from {IE_32,GOTIE} access model:
998 subl foo@{tpoff,gontoff}(%reg1), %reg2
999 movl foo@{tpoff,gontoff}(%reg1), %reg2
1000 addl foo@{tpoff,gontoff}(%reg1), %reg2
1001 */
1002
1003 if (offset < 2 || (offset + 4) > sec->size)
1004 return false;
1005
1006 val = bfd_get_8 (abfd, contents + offset - 1);
1007 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1008 return false;
1009
1010 type = bfd_get_8 (abfd, contents + offset - 2);
1011 return type == 0x8b || type == 0x2b || type == 0x03;
1012
1013 case R_386_TLS_GOTDESC:
1014 /* Check transition from GDesc access model:
1015 leal x@tlsdesc(%ebx), %eax
1016
1017 Make sure it's a leal adding ebx to a 32-bit offset
1018 into any register, although it's probably almost always
1019 going to be eax. */
1020
1021 if (offset < 2 || (offset + 4) > sec->size)
1022 return false;
1023
1024 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1025 return false;
1026
1027 val = bfd_get_8 (abfd, contents + offset - 1);
1028 return (val & 0xc7) == 0x83;
1029
1030 case R_386_TLS_DESC_CALL:
1031 /* Check transition from GDesc access model:
1032 call *x@tlsdesc(%eax)
1033 */
1034 if (offset + 2 <= sec->size)
1035 {
1036 /* Make sure that it's a call *x@tlsdesc(%eax). */
1037 call = contents + offset;
1038 return call[0] == 0xff && call[1] == 0x10;
1039 }
1040
1041 return false;
1042
1043 default:
1044 abort ();
1045 }
1046 }
1047
1048 /* Return TRUE if the TLS access transition is OK or no transition
1049 will be performed. Update R_TYPE if there is a transition. */
1050
1051 static bool
1052 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1053 asection *sec, bfd_byte *contents,
1054 Elf_Internal_Shdr *symtab_hdr,
1055 struct elf_link_hash_entry **sym_hashes,
1056 unsigned int *r_type, int tls_type,
1057 const Elf_Internal_Rela *rel,
1058 const Elf_Internal_Rela *relend,
1059 struct elf_link_hash_entry *h,
1060 unsigned long r_symndx,
1061 bool from_relocate_section)
1062 {
1063 unsigned int from_type = *r_type;
1064 unsigned int to_type = from_type;
1065 bool check = true;
1066 unsigned int to_le_type, to_ie_type;
1067
1068 /* Skip TLS transition for functions. */
1069 if (h != NULL
1070 && (h->type == STT_FUNC
1071 || h->type == STT_GNU_IFUNC))
1072 return true;
1073
1074 if (get_elf_backend_data (abfd)->target_os == is_solaris)
1075 {
1076 /* NB: Solaris only supports R_386_TLS_LE and R_386_TLS_IE. */
1077 to_le_type = R_386_TLS_LE;
1078 to_ie_type = R_386_TLS_IE;
1079 }
1080 else
1081 {
1082 to_le_type = R_386_TLS_LE_32;
1083 to_ie_type = R_386_TLS_IE_32;
1084 }
1085
1086 switch (from_type)
1087 {
1088 case R_386_TLS_GD:
1089 case R_386_TLS_GOTDESC:
1090 case R_386_TLS_DESC_CALL:
1091 case R_386_TLS_IE_32:
1092 case R_386_TLS_IE:
1093 case R_386_TLS_GOTIE:
1094 if (bfd_link_executable (info))
1095 {
1096 if (h == NULL)
1097 to_type = to_le_type;
1098 else if (from_type != R_386_TLS_IE
1099 && from_type != R_386_TLS_GOTIE)
1100 to_type = to_ie_type;
1101 }
1102
1103 /* When we are called from elf_i386_relocate_section, there may
1104 be additional transitions based on TLS_TYPE. */
1105 if (from_relocate_section)
1106 {
1107 unsigned int new_to_type = to_type;
1108
1109 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1110 new_to_type = to_le_type;
1111
1112 if (to_type == R_386_TLS_GD
1113 || to_type == R_386_TLS_GOTDESC
1114 || to_type == R_386_TLS_DESC_CALL)
1115 {
1116 if (tls_type == GOT_TLS_IE_POS)
1117 new_to_type = R_386_TLS_GOTIE;
1118 else if (tls_type & GOT_TLS_IE)
1119 new_to_type = to_ie_type;
1120 }
1121
1122 /* We checked the transition before when we were called from
1123 elf_i386_scan_relocs. We only want to check the new
1124 transition which hasn't been checked before. */
1125 check = new_to_type != to_type && from_type == to_type;
1126 to_type = new_to_type;
1127 }
1128
1129 break;
1130
1131 case R_386_TLS_LDM:
1132 if (bfd_link_executable (info))
1133 to_type = to_le_type;
1134 break;
1135
1136 default:
1137 return true;
1138 }
1139
1140 /* Return TRUE if there is no transition. */
1141 if (from_type == to_type)
1142 return true;
1143
1144 /* Check if the transition can be performed. */
1145 if (check
1146 && ! elf_i386_check_tls_transition (sec, contents,
1147 symtab_hdr, sym_hashes,
1148 from_type, rel, relend))
1149 {
1150 reloc_howto_type *from, *to;
1151 const char *name;
1152
1153 from = elf_i386_rtype_to_howto (from_type);
1154 to = elf_i386_rtype_to_howto (to_type);
1155
1156 if (h)
1157 name = h->root.root.string;
1158 else
1159 {
1160 struct elf_x86_link_hash_table *htab;
1161
1162 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1163 if (htab == NULL)
1164 name = "*unknown*";
1165 else
1166 {
1167 Elf_Internal_Sym *isym;
1168
1169 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1170 abfd, r_symndx);
1171 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1172 }
1173 }
1174
1175 _bfd_error_handler
1176 /* xgettext:c-format */
1177 (_("%pB: TLS transition from %s to %s against `%s'"
1178 " at %#" PRIx64 " in section `%pA' failed"),
1179 abfd, from->name, to->name, name,
1180 (uint64_t) rel->r_offset, sec);
1181 bfd_set_error (bfd_error_bad_value);
1182 return false;
1183 }
1184
1185 *r_type = to_type;
1186 return true;
1187 }
1188
1189 /* With the local symbol, foo, we convert
1190 mov foo@GOT[(%reg1)], %reg2
1191 to
1192 lea foo[@GOTOFF(%reg1)], %reg2
1193 and convert
1194 call/jmp *foo@GOT[(%reg)]
1195 to
1196 nop call foo/jmp foo nop
1197 When PIC is false, convert
1198 test %reg1, foo@GOT[(%reg2)]
1199 to
1200 test $foo, %reg1
1201 and convert
1202 binop foo@GOT[(%reg1)], %reg2
1203 to
1204 binop $foo, %reg2
1205 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1206 instructions. */
1207
1208 static
1209 bool
1210 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1211 bfd_byte *contents,
1212 unsigned int *r_type_p,
1213 Elf_Internal_Rela *irel,
1214 struct elf_link_hash_entry *h,
1215 bool *converted,
1216 struct bfd_link_info *link_info)
1217 {
1218 struct elf_x86_link_hash_table *htab;
1219 unsigned int opcode;
1220 unsigned int modrm;
1221 bool baseless;
1222 Elf_Internal_Sym *isym;
1223 unsigned int addend;
1224 unsigned int nop;
1225 bfd_vma nop_offset;
1226 bool is_pic;
1227 bool to_reloc_32;
1228 bool abs_symbol;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232 bool local_ref;
1233 struct elf_x86_link_hash_entry *eh;
1234
1235 if (roff < 2)
1236 return true;
1237
1238 /* Addend for R_386_GOT32X relocations must be 0. */
1239 addend = bfd_get_32 (abfd, contents + roff);
1240 if (addend != 0)
1241 return true;
1242
1243 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1244 is_pic = bfd_link_pic (link_info);
1245
1246 r_type = *r_type_p;
1247 r_symndx = ELF32_R_SYM (irel->r_info);
1248
1249 modrm = bfd_get_8 (abfd, contents + roff - 1);
1250 baseless = (modrm & 0xc7) == 0x5;
1251
1252 if (h)
1253 {
1254 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1255 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1256 isym = NULL;
1257 abs_symbol = ABS_SYMBOL_P (h);
1258 }
1259 else
1260 {
1261 local_ref = true;
1262 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd,
1263 r_symndx);
1264 abs_symbol = isym->st_shndx == SHN_ABS;
1265 }
1266
1267 if (baseless && is_pic)
1268 {
1269 /* For PIC, disallow R_386_GOT32X without a base register
1270 since we don't know what the GOT base is. */
1271 const char *name;
1272
1273 if (h == NULL)
1274 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1275 else
1276 name = h->root.root.string;
1277
1278 _bfd_error_handler
1279 /* xgettext:c-format */
1280 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1281 " register can not be used when making a shared object"),
1282 abfd, name);
1283 return false;
1284 }
1285
1286 opcode = bfd_get_8 (abfd, contents + roff - 2);
1287
1288 /* Convert to R_386_32 if PIC is false or there is no base
1289 register. */
1290 to_reloc_32 = !is_pic || baseless;
1291
1292 eh = elf_x86_hash_entry (h);
1293
1294 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1295 reloc. */
1296 if (h == NULL)
1297 {
1298 if (opcode == 0x0ff)
1299 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1300 goto convert_branch;
1301 else
1302 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1303 "test %reg1, foo@GOT(%reg2)" and
1304 "binop foo@GOT[(%reg1)], %reg2". */
1305 goto convert_load;
1306 }
1307
1308 /* Undefined weak symbol is only bound locally in executable
1309 and its reference is resolved as 0. */
1310 if (h->root.type == bfd_link_hash_undefweak
1311 && !eh->linker_def
1312 && local_ref)
1313 {
1314 if (opcode == 0xff)
1315 {
1316 /* No direct branch to 0 for PIC. */
1317 if (is_pic)
1318 return true;
1319 else
1320 goto convert_branch;
1321 }
1322 else
1323 {
1324 /* We can convert load of address 0 to R_386_32. */
1325 to_reloc_32 = true;
1326 goto convert_load;
1327 }
1328 }
1329
1330 if (opcode == 0xff)
1331 {
1332 /* We have "call/jmp *foo@GOT[(%reg)]". */
1333 if ((h->root.type == bfd_link_hash_defined
1334 || h->root.type == bfd_link_hash_defweak)
1335 && local_ref)
1336 {
1337 /* The function is locally defined. */
1338 convert_branch:
1339 /* Convert R_386_GOT32X to R_386_PC32. */
1340 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1341 {
1342 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1343 is a nop prefix. */
1344 modrm = 0xe8;
1345 /* To support TLS optimization, always use addr32 prefix
1346 for "call *___tls_get_addr@GOT(%reg)". */
1347 if (eh && eh->tls_get_addr)
1348 {
1349 nop = 0x67;
1350 nop_offset = irel->r_offset - 2;
1351 }
1352 else
1353 {
1354 nop = htab->params->call_nop_byte;
1355 if (htab->params->call_nop_as_suffix)
1356 {
1357 nop_offset = roff + 3;
1358 irel->r_offset -= 1;
1359 }
1360 else
1361 nop_offset = roff - 2;
1362 }
1363 }
1364 else
1365 {
1366 /* Convert to "jmp foo nop". */
1367 modrm = 0xe9;
1368 nop = NOP_OPCODE;
1369 nop_offset = roff + 3;
1370 irel->r_offset -= 1;
1371 }
1372
1373 bfd_put_8 (abfd, nop, contents + nop_offset);
1374 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1375 /* When converting to PC-relative relocation, we
1376 need to adjust addend by -4. */
1377 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1378 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1379 *r_type_p = R_386_PC32;
1380 *converted = true;
1381 }
1382 }
1383 else
1384 {
1385 /* We have "mov foo@GOT[(%re1g)], %reg2",
1386 "test %reg1, foo@GOT(%reg2)" and
1387 "binop foo@GOT[(%reg1)], %reg2".
1388
1389 Avoid optimizing _DYNAMIC since ld.so may use its
1390 link-time address. */
1391 if (h == htab->elf.hdynamic)
1392 return true;
1393
1394 /* def_regular is set by an assignment in a linker script in
1395 bfd_elf_record_link_assignment. start_stop is set on
1396 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1397 if (h->start_stop
1398 || eh->linker_def
1399 || ((h->def_regular
1400 || h->root.type == bfd_link_hash_defined
1401 || h->root.type == bfd_link_hash_defweak)
1402 && local_ref))
1403 {
1404 convert_load:
1405 if (opcode == 0x8b)
1406 {
1407 if (abs_symbol && local_ref)
1408 to_reloc_32 = true;
1409
1410 if (to_reloc_32)
1411 {
1412 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1413 "mov $foo, %reg2" with R_386_32. */
1414 r_type = R_386_32;
1415 modrm = 0xc0 | (modrm & 0x38) >> 3;
1416 bfd_put_8 (abfd, modrm, contents + roff - 1);
1417 opcode = 0xc7;
1418 }
1419 else
1420 {
1421 /* Convert "mov foo@GOT(%reg1), %reg2" to
1422 "lea foo@GOTOFF(%reg1), %reg2". */
1423 r_type = R_386_GOTOFF;
1424 opcode = 0x8d;
1425 }
1426 }
1427 else
1428 {
1429 /* Only R_386_32 is supported. */
1430 if (!to_reloc_32)
1431 return true;
1432
1433 if (opcode == 0x85)
1434 {
1435 /* Convert "test %reg1, foo@GOT(%reg2)" to
1436 "test $foo, %reg1". */
1437 modrm = 0xc0 | (modrm & 0x38) >> 3;
1438 opcode = 0xf7;
1439 }
1440 else
1441 {
1442 /* Convert "binop foo@GOT(%reg1), %reg2" to
1443 "binop $foo, %reg2". */
1444 modrm = (0xc0
1445 | (modrm & 0x38) >> 3
1446 | (opcode & 0x3c));
1447 opcode = 0x81;
1448 }
1449 bfd_put_8 (abfd, modrm, contents + roff - 1);
1450 r_type = R_386_32;
1451 }
1452
1453 bfd_put_8 (abfd, opcode, contents + roff - 2);
1454 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1455 *r_type_p = r_type;
1456 *converted = true;
1457 }
1458 }
1459
1460 return true;
1461 }
1462
1463 /* Look through the relocs for a section during the first phase, and
1464 calculate needed space in the global offset table, and procedure
1465 linkage table. */
1466
1467 static bool
1468 elf_i386_scan_relocs (bfd *abfd,
1469 struct bfd_link_info *info,
1470 asection *sec,
1471 const Elf_Internal_Rela *relocs)
1472 {
1473 struct elf_x86_link_hash_table *htab;
1474 Elf_Internal_Shdr *symtab_hdr;
1475 struct elf_link_hash_entry **sym_hashes;
1476 const Elf_Internal_Rela *rel;
1477 const Elf_Internal_Rela *rel_end;
1478 bfd_byte *contents;
1479 bool converted;
1480
1481 if (bfd_link_relocatable (info))
1482 return true;
1483
1484 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1485 if (htab == NULL)
1486 {
1487 sec->check_relocs_failed = 1;
1488 return false;
1489 }
1490
1491 BFD_ASSERT (is_x86_elf (abfd, htab));
1492
1493 /* Get the section contents. */
1494 if (elf_section_data (sec)->this_hdr.contents != NULL)
1495 contents = elf_section_data (sec)->this_hdr.contents;
1496 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1497 {
1498 sec->check_relocs_failed = 1;
1499 return false;
1500 }
1501
1502 symtab_hdr = &elf_symtab_hdr (abfd);
1503 sym_hashes = elf_sym_hashes (abfd);
1504
1505 converted = false;
1506
1507 rel_end = relocs + sec->reloc_count;
1508 for (rel = relocs; rel < rel_end; rel++)
1509 {
1510 unsigned int r_type;
1511 unsigned int r_symndx;
1512 struct elf_link_hash_entry *h;
1513 struct elf_x86_link_hash_entry *eh;
1514 Elf_Internal_Sym *isym;
1515 const char *name;
1516 bool size_reloc;
1517 bool no_dynreloc;
1518
1519 r_symndx = ELF32_R_SYM (rel->r_info);
1520 r_type = ELF32_R_TYPE (rel->r_info);
1521
1522 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1523 {
1524 /* xgettext:c-format */
1525 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1526 abfd, r_symndx);
1527 goto error_return;
1528 }
1529
1530 if (r_symndx < symtab_hdr->sh_info)
1531 {
1532 /* A local symbol. */
1533 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1534 abfd, r_symndx);
1535 if (isym == NULL)
1536 goto error_return;
1537
1538 /* Check relocation against local STT_GNU_IFUNC symbol. */
1539 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1540 {
1541 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
1542 if (h == NULL)
1543 goto error_return;
1544
1545 /* Fake a STT_GNU_IFUNC symbol. */
1546 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1547 isym, NULL);
1548 h->type = STT_GNU_IFUNC;
1549 h->def_regular = 1;
1550 h->ref_regular = 1;
1551 h->forced_local = 1;
1552 h->root.type = bfd_link_hash_defined;
1553 }
1554 else
1555 h = NULL;
1556 }
1557 else
1558 {
1559 isym = NULL;
1560 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1561 while (h->root.type == bfd_link_hash_indirect
1562 || h->root.type == bfd_link_hash_warning)
1563 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1564 }
1565
1566 eh = (struct elf_x86_link_hash_entry *) h;
1567 if (h != NULL)
1568 {
1569 if (r_type == R_386_GOTOFF)
1570 eh->gotoff_ref = 1;
1571
1572 /* It is referenced by a non-shared object. */
1573 h->ref_regular = 1;
1574 }
1575
1576 if (r_type == R_386_GOT32X
1577 && (h == NULL || h->type != STT_GNU_IFUNC))
1578 {
1579 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1580 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1581 &r_type, irel, h,
1582 &converted, info))
1583 goto error_return;
1584 }
1585
1586 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1587 symtab_hdr, &no_dynreloc))
1588 return false;
1589
1590 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1591 symtab_hdr, sym_hashes,
1592 &r_type, GOT_UNKNOWN,
1593 rel, rel_end, h, r_symndx, false))
1594 goto error_return;
1595
1596 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1597 if (h == htab->elf.hgot)
1598 htab->got_referenced = true;
1599
1600 switch (r_type)
1601 {
1602 case R_386_TLS_LDM:
1603 htab->tls_ld_or_ldm_got.refcount = 1;
1604 goto create_got;
1605
1606 case R_386_PLT32:
1607 /* This symbol requires a procedure linkage table entry. We
1608 actually build the entry in adjust_dynamic_symbol,
1609 because this might be a case of linking PIC code which is
1610 never referenced by a dynamic object, in which case we
1611 don't need to generate a procedure linkage table entry
1612 after all. */
1613
1614 /* If this is a local symbol, we resolve it directly without
1615 creating a procedure linkage table entry. */
1616 if (h == NULL)
1617 continue;
1618
1619 eh->zero_undefweak &= 0x2;
1620 h->needs_plt = 1;
1621 h->plt.refcount = 1;
1622 break;
1623
1624 case R_386_SIZE32:
1625 size_reloc = true;
1626 goto do_size;
1627
1628 case R_386_TLS_IE_32:
1629 case R_386_TLS_IE:
1630 case R_386_TLS_GOTIE:
1631 if (!bfd_link_executable (info))
1632 info->flags |= DF_STATIC_TLS;
1633 /* Fall through */
1634
1635 case R_386_GOT32:
1636 case R_386_GOT32X:
1637 case R_386_TLS_GD:
1638 case R_386_TLS_GOTDESC:
1639 case R_386_TLS_DESC_CALL:
1640 /* This symbol requires a global offset table entry. */
1641 {
1642 int tls_type, old_tls_type;
1643
1644 switch (r_type)
1645 {
1646 default:
1647 case R_386_GOT32:
1648 case R_386_GOT32X:
1649 tls_type = GOT_NORMAL;
1650 break;
1651 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1652 case R_386_TLS_GOTDESC:
1653 case R_386_TLS_DESC_CALL:
1654 tls_type = GOT_TLS_GDESC; break;
1655 case R_386_TLS_IE_32:
1656 if (ELF32_R_TYPE (rel->r_info) == r_type)
1657 tls_type = GOT_TLS_IE_NEG;
1658 else
1659 /* If this is a GD->IE transition, we may use either of
1660 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1661 tls_type = GOT_TLS_IE;
1662 break;
1663 case R_386_TLS_IE:
1664 case R_386_TLS_GOTIE:
1665 tls_type = GOT_TLS_IE_POS; break;
1666 }
1667
1668 if (h != NULL)
1669 {
1670 h->got.refcount = 1;
1671 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1672 }
1673 else
1674 {
1675 bfd_signed_vma *local_got_refcounts;
1676
1677 if (!elf_x86_allocate_local_got_info (abfd,
1678 symtab_hdr->sh_info))
1679 goto error_return;
1680
1681 /* This is a global offset table entry for a local symbol. */
1682 local_got_refcounts = elf_local_got_refcounts (abfd);
1683 local_got_refcounts[r_symndx] = 1;
1684 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1685 }
1686
1687 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1688 tls_type |= old_tls_type;
1689 /* If a TLS symbol is accessed using IE at least once,
1690 there is no point to use dynamic model for it. */
1691 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1692 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1693 || (tls_type & GOT_TLS_IE) == 0))
1694 {
1695 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1696 tls_type = old_tls_type;
1697 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1698 && GOT_TLS_GD_ANY_P (tls_type))
1699 tls_type |= old_tls_type;
1700 else
1701 {
1702 if (h)
1703 name = h->root.root.string;
1704 else
1705 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1706 NULL);
1707 _bfd_error_handler
1708 /* xgettext:c-format */
1709 (_("%pB: `%s' accessed both as normal and "
1710 "thread local symbol"),
1711 abfd, name);
1712 bfd_set_error (bfd_error_bad_value);
1713 goto error_return;
1714 }
1715 }
1716
1717 if (old_tls_type != tls_type)
1718 {
1719 if (h != NULL)
1720 elf_x86_hash_entry (h)->tls_type = tls_type;
1721 else
1722 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1723 }
1724 }
1725 /* Fall through */
1726
1727 case R_386_GOTOFF:
1728 case R_386_GOTPC:
1729 create_got:
1730 if (r_type != R_386_TLS_IE)
1731 {
1732 if (eh != NULL)
1733 {
1734 eh->zero_undefweak &= 0x2;
1735
1736 /* Need GOT to resolve undefined weak symbol to 0. */
1737 if (r_type == R_386_GOTOFF
1738 && h->root.type == bfd_link_hash_undefweak
1739 && bfd_link_executable (info))
1740 htab->got_referenced = true;
1741 }
1742 break;
1743 }
1744 /* Fall through */
1745
1746 case R_386_TLS_LE_32:
1747 case R_386_TLS_LE:
1748 if (eh != NULL)
1749 eh->zero_undefweak &= 0x2;
1750 if (bfd_link_executable (info))
1751 break;
1752 info->flags |= DF_STATIC_TLS;
1753 goto do_relocation;
1754
1755 case R_386_32:
1756 case R_386_PC32:
1757 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1758 eh->zero_undefweak |= 0x2;
1759 do_relocation:
1760 /* We are called after all symbols have been resolved. Only
1761 relocation against STT_GNU_IFUNC symbol must go through
1762 PLT. */
1763 if (h != NULL
1764 && (bfd_link_executable (info)
1765 || h->type == STT_GNU_IFUNC))
1766 {
1767 bool func_pointer_ref = false;
1768
1769 if (r_type == R_386_PC32)
1770 {
1771 /* Since something like ".long foo - ." may be used
1772 as pointer, make sure that PLT is used if foo is
1773 a function defined in a shared library. */
1774 if ((sec->flags & SEC_CODE) == 0)
1775 h->pointer_equality_needed = 1;
1776 else if (h->type == STT_GNU_IFUNC
1777 && bfd_link_pic (info))
1778 {
1779 _bfd_error_handler
1780 /* xgettext:c-format */
1781 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1782 abfd, h->root.root.string);
1783 bfd_set_error (bfd_error_bad_value);
1784 goto error_return;
1785 }
1786 }
1787 else
1788 {
1789 /* R_386_32 can be resolved at run-time. Function
1790 pointer reference doesn't need PLT for pointer
1791 equality. */
1792 if (r_type == R_386_32
1793 && (sec->flags & SEC_READONLY) == 0)
1794 func_pointer_ref = true;
1795
1796 /* IFUNC symbol needs pointer equality in PDE so that
1797 function pointer reference will be resolved to its
1798 PLT entry directly. */
1799 if (!func_pointer_ref
1800 || (bfd_link_pde (info)
1801 && h->type == STT_GNU_IFUNC))
1802 h->pointer_equality_needed = 1;
1803 }
1804
1805 if (!func_pointer_ref)
1806 {
1807 /* If this reloc is in a read-only section, we might
1808 need a copy reloc. We can't check reliably at this
1809 stage whether the section is read-only, as input
1810 sections have not yet been mapped to output sections.
1811 Tentatively set the flag for now, and correct in
1812 adjust_dynamic_symbol. */
1813 h->non_got_ref = 1;
1814
1815 if (!elf_has_indirect_extern_access (sec->owner))
1816 eh->non_got_ref_without_indirect_extern_access = 1;
1817
1818 /* We may need a .plt entry if the symbol is a function
1819 defined in a shared lib or is a function referenced
1820 from the code or read-only section. */
1821 if (!h->def_regular
1822 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1823 h->plt.refcount = 1;
1824
1825 if (htab->elf.target_os != is_solaris
1826 && h->pointer_equality_needed
1827 && h->type == STT_FUNC
1828 && eh->def_protected
1829 && !SYMBOL_DEFINED_NON_SHARED_P (h)
1830 && h->def_dynamic)
1831 {
1832 /* Disallow non-canonical reference to canonical
1833 protected function. */
1834 _bfd_error_handler
1835 /* xgettext:c-format */
1836 (_("%pB: non-canonical reference to canonical "
1837 "protected function `%s' in %pB"),
1838 abfd, h->root.root.string,
1839 h->root.u.def.section->owner);
1840 bfd_set_error (bfd_error_bad_value);
1841 goto error_return;
1842 }
1843 }
1844 }
1845
1846 size_reloc = false;
1847 do_size:
1848 if (!no_dynreloc
1849 && NEED_DYNAMIC_RELOCATION_P (false, info, false, h, sec,
1850 r_type, R_386_32))
1851 {
1852 struct elf_dyn_relocs *p;
1853 struct elf_dyn_relocs **head;
1854
1855 /* If this is a global symbol, we count the number of
1856 relocations we need for this symbol. */
1857 if (h != NULL)
1858 {
1859 head = &h->dyn_relocs;
1860 }
1861 else
1862 {
1863 /* Track dynamic relocs needed for local syms too.
1864 We really need local syms available to do this
1865 easily. Oh well. */
1866 void **vpp;
1867 asection *s;
1868
1869 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1870 abfd, r_symndx);
1871 if (isym == NULL)
1872 goto error_return;
1873
1874 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1875 if (s == NULL)
1876 s = sec;
1877
1878 vpp = &elf_section_data (s)->local_dynrel;
1879 head = (struct elf_dyn_relocs **)vpp;
1880 }
1881
1882 p = *head;
1883 if (p == NULL || p->sec != sec)
1884 {
1885 size_t amt = sizeof *p;
1886 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1887 amt);
1888 if (p == NULL)
1889 goto error_return;
1890 p->next = *head;
1891 *head = p;
1892 p->sec = sec;
1893 p->count = 0;
1894 p->pc_count = 0;
1895 }
1896
1897 p->count += 1;
1898 /* Count size relocation as PC-relative relocation. */
1899 if (r_type == R_386_PC32 || size_reloc)
1900 p->pc_count += 1;
1901 }
1902 break;
1903
1904 /* This relocation describes the C++ object vtable hierarchy.
1905 Reconstruct it for later use during GC. */
1906 case R_386_GNU_VTINHERIT:
1907 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1908 goto error_return;
1909 break;
1910
1911 /* This relocation describes which C++ vtable entries are actually
1912 used. Record for later use during GC. */
1913 case R_386_GNU_VTENTRY:
1914 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1915 goto error_return;
1916 break;
1917
1918 default:
1919 break;
1920 }
1921 }
1922
1923 if (elf_section_data (sec)->this_hdr.contents != contents)
1924 {
1925 if (!converted && !_bfd_link_keep_memory (info))
1926 free (contents);
1927 else
1928 {
1929 /* Cache the section contents for elf_link_input_bfd if any
1930 load is converted or --no-keep-memory isn't used. */
1931 elf_section_data (sec)->this_hdr.contents = contents;
1932 info->cache_size += sec->size;
1933 }
1934 }
1935
1936 /* Cache relocations if any load is converted. */
1937 if (elf_section_data (sec)->relocs != relocs && converted)
1938 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1939
1940 return true;
1941
1942 error_return:
1943 if (elf_section_data (sec)->this_hdr.contents != contents)
1944 free (contents);
1945 sec->check_relocs_failed = 1;
1946 return false;
1947 }
1948
1949 static bool
1950 elf_i386_always_size_sections (bfd *output_bfd,
1951 struct bfd_link_info *info)
1952 {
1953 bfd *abfd;
1954
1955 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
1956 for (abfd = info->input_bfds;
1957 abfd != (bfd *) NULL;
1958 abfd = abfd->link.next)
1959 if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
1960 && !_bfd_elf_link_iterate_on_relocs (abfd, info,
1961 elf_i386_scan_relocs))
1962 return false;
1963
1964 return _bfd_x86_elf_always_size_sections (output_bfd, info);
1965 }
1966
1967 /* Set the correct type for an x86 ELF section. We do this by the
1968 section name, which is a hack, but ought to work. */
1969
1970 static bool
1971 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1972 Elf_Internal_Shdr *hdr,
1973 asection *sec)
1974 {
1975 const char *name;
1976
1977 name = bfd_section_name (sec);
1978
1979 /* This is an ugly, but unfortunately necessary hack that is
1980 needed when producing EFI binaries on x86. It tells
1981 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1982 containing ELF relocation info. We need this hack in order to
1983 be able to generate ELF binaries that can be translated into
1984 EFI applications (which are essentially COFF objects). Those
1985 files contain a COFF ".reloc" section inside an ELFNN object,
1986 which would normally cause BFD to segfault because it would
1987 attempt to interpret this section as containing relocation
1988 entries for section "oc". With this hack enabled, ".reloc"
1989 will be treated as a normal data section, which will avoid the
1990 segfault. However, you won't be able to create an ELFNN binary
1991 with a section named "oc" that needs relocations, but that's
1992 the kind of ugly side-effects you get when detecting section
1993 types based on their names... In practice, this limitation is
1994 unlikely to bite. */
1995 if (strcmp (name, ".reloc") == 0)
1996 hdr->sh_type = SHT_PROGBITS;
1997
1998 return true;
1999 }
2000
2001 /* Return the relocation value for @tpoff relocation
2002 if STT_TLS virtual address is ADDRESS. */
2003
2004 static bfd_vma
2005 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2006 {
2007 struct elf_link_hash_table *htab = elf_hash_table (info);
2008 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2009 bfd_vma static_tls_size;
2010
2011 /* If tls_sec is NULL, we should have signalled an error already. */
2012 if (htab->tls_sec == NULL)
2013 return 0;
2014
2015 /* Consider special static TLS alignment requirements. */
2016 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2017 return static_tls_size + htab->tls_sec->vma - address;
2018 }
2019
2020 /* Relocate an i386 ELF section. */
2021
2022 static int
2023 elf_i386_relocate_section (bfd *output_bfd,
2024 struct bfd_link_info *info,
2025 bfd *input_bfd,
2026 asection *input_section,
2027 bfd_byte *contents,
2028 Elf_Internal_Rela *relocs,
2029 Elf_Internal_Sym *local_syms,
2030 asection **local_sections)
2031 {
2032 struct elf_x86_link_hash_table *htab;
2033 Elf_Internal_Shdr *symtab_hdr;
2034 struct elf_link_hash_entry **sym_hashes;
2035 bfd_vma *local_got_offsets;
2036 bfd_vma *local_tlsdesc_gotents;
2037 Elf_Internal_Rela *rel;
2038 Elf_Internal_Rela *wrel;
2039 Elf_Internal_Rela *relend;
2040 bool is_vxworks_tls;
2041 unsigned expected_tls_le;
2042 unsigned plt_entry_size;
2043
2044 /* Skip if check_relocs or scan_relocs failed. */
2045 if (input_section->check_relocs_failed)
2046 return false;
2047
2048 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2049 if (htab == NULL)
2050 return false;
2051
2052 if (!is_x86_elf (input_bfd, htab))
2053 {
2054 bfd_set_error (bfd_error_wrong_format);
2055 return false;
2056 }
2057
2058 symtab_hdr = &elf_symtab_hdr (input_bfd);
2059 sym_hashes = elf_sym_hashes (input_bfd);
2060 local_got_offsets = elf_local_got_offsets (input_bfd);
2061 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2062 /* We have to handle relocations in vxworks .tls_vars sections
2063 specially, because the dynamic loader is 'weird'. */
2064 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2065 && bfd_link_pic (info)
2066 && !strcmp (input_section->output_section->name,
2067 ".tls_vars"));
2068
2069 _bfd_x86_elf_set_tls_module_base (info);
2070
2071 plt_entry_size = htab->plt.plt_entry_size;
2072
2073 rel = wrel = relocs;
2074 relend = relocs + input_section->reloc_count;
2075 for (; rel < relend; wrel++, rel++)
2076 {
2077 unsigned int r_type, r_type_tls;
2078 reloc_howto_type *howto;
2079 unsigned long r_symndx;
2080 struct elf_link_hash_entry *h;
2081 struct elf_x86_link_hash_entry *eh;
2082 Elf_Internal_Sym *sym;
2083 asection *sec;
2084 bfd_vma off, offplt, plt_offset;
2085 bfd_vma relocation;
2086 bool unresolved_reloc;
2087 bfd_reloc_status_type r;
2088 unsigned int indx;
2089 int tls_type;
2090 bfd_vma st_size;
2091 asection *resolved_plt;
2092 bool resolved_to_zero;
2093 bool relative_reloc;
2094
2095 r_type = ELF32_R_TYPE (rel->r_info);
2096 if (r_type == R_386_GNU_VTINHERIT
2097 || r_type == R_386_GNU_VTENTRY)
2098 {
2099 if (wrel != rel)
2100 *wrel = *rel;
2101 continue;
2102 }
2103
2104 howto = elf_i386_rtype_to_howto (r_type);
2105 if (howto == NULL)
2106 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2107
2108 r_symndx = ELF32_R_SYM (rel->r_info);
2109 h = NULL;
2110 sym = NULL;
2111 sec = NULL;
2112 unresolved_reloc = false;
2113 if (r_symndx < symtab_hdr->sh_info)
2114 {
2115 sym = local_syms + r_symndx;
2116 sec = local_sections[r_symndx];
2117 relocation = (sec->output_section->vma
2118 + sec->output_offset
2119 + sym->st_value);
2120 st_size = sym->st_size;
2121
2122 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2123 && ((sec->flags & SEC_MERGE) != 0
2124 || (bfd_link_relocatable (info)
2125 && sec->output_offset != 0)))
2126 {
2127 bfd_vma addend;
2128 bfd_byte *where = contents + rel->r_offset;
2129
2130 switch (bfd_get_reloc_size (howto))
2131 {
2132 case 1:
2133 addend = bfd_get_8 (input_bfd, where);
2134 if (howto->pc_relative)
2135 {
2136 addend = (addend ^ 0x80) - 0x80;
2137 addend += 1;
2138 }
2139 break;
2140 case 2:
2141 addend = bfd_get_16 (input_bfd, where);
2142 if (howto->pc_relative)
2143 {
2144 addend = (addend ^ 0x8000) - 0x8000;
2145 addend += 2;
2146 }
2147 break;
2148 case 4:
2149 addend = bfd_get_32 (input_bfd, where);
2150 if (howto->pc_relative)
2151 {
2152 addend = (addend ^ 0x80000000) - 0x80000000;
2153 addend += 4;
2154 }
2155 break;
2156 default:
2157 abort ();
2158 }
2159
2160 if (bfd_link_relocatable (info))
2161 addend += sec->output_offset;
2162 else
2163 {
2164 asection *msec = sec;
2165 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2166 addend);
2167 addend -= relocation;
2168 addend += msec->output_section->vma + msec->output_offset;
2169 }
2170
2171 switch (bfd_get_reloc_size (howto))
2172 {
2173 case 1:
2174 /* FIXME: overflow checks. */
2175 if (howto->pc_relative)
2176 addend -= 1;
2177 bfd_put_8 (input_bfd, addend, where);
2178 break;
2179 case 2:
2180 if (howto->pc_relative)
2181 addend -= 2;
2182 bfd_put_16 (input_bfd, addend, where);
2183 break;
2184 case 4:
2185 if (howto->pc_relative)
2186 addend -= 4;
2187 bfd_put_32 (input_bfd, addend, where);
2188 break;
2189 }
2190 }
2191 else if (!bfd_link_relocatable (info)
2192 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2193 {
2194 /* Relocate against local STT_GNU_IFUNC symbol. */
2195 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2196 false);
2197 if (h == NULL)
2198 abort ();
2199
2200 /* Set STT_GNU_IFUNC symbol value. */
2201 h->root.u.def.value = sym->st_value;
2202 h->root.u.def.section = sec;
2203 }
2204 }
2205 else
2206 {
2207 bool warned ATTRIBUTE_UNUSED;
2208 bool ignored ATTRIBUTE_UNUSED;
2209
2210 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2211 r_symndx, symtab_hdr, sym_hashes,
2212 h, sec, relocation,
2213 unresolved_reloc, warned, ignored);
2214 st_size = h->size;
2215 }
2216
2217 if (sec != NULL && discarded_section (sec))
2218 {
2219 _bfd_clear_contents (howto, input_bfd, input_section,
2220 contents, rel->r_offset);
2221 wrel->r_offset = rel->r_offset;
2222 wrel->r_info = 0;
2223 wrel->r_addend = 0;
2224
2225 /* For ld -r, remove relocations in debug sections against
2226 sections defined in discarded sections. Not done for
2227 eh_frame editing code expects to be present. */
2228 if (bfd_link_relocatable (info)
2229 && (input_section->flags & SEC_DEBUGGING))
2230 wrel--;
2231
2232 continue;
2233 }
2234
2235 if (bfd_link_relocatable (info))
2236 {
2237 if (wrel != rel)
2238 *wrel = *rel;
2239 continue;
2240 }
2241
2242 eh = (struct elf_x86_link_hash_entry *) h;
2243
2244 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2245 it here if it is defined in a non-shared object. */
2246 if (h != NULL
2247 && h->type == STT_GNU_IFUNC
2248 && h->def_regular)
2249 {
2250 asection *gotplt, *base_got;
2251 bfd_vma plt_index;
2252 const char *name;
2253
2254 if ((input_section->flags & SEC_ALLOC) == 0)
2255 {
2256 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2257 STT_GNU_IFUNC symbol as STT_FUNC. */
2258 if (elf_section_type (input_section) == SHT_NOTE)
2259 goto skip_ifunc;
2260 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2261 sections because such sections are not SEC_ALLOC and
2262 thus ld.so will not process them. */
2263 if ((input_section->flags & SEC_DEBUGGING) != 0)
2264 continue;
2265 abort ();
2266 }
2267
2268 /* STT_GNU_IFUNC symbol must go through PLT. */
2269 if (htab->elf.splt != NULL)
2270 {
2271 if (htab->plt_second != NULL)
2272 {
2273 resolved_plt = htab->plt_second;
2274 plt_offset = eh->plt_second.offset;
2275 }
2276 else
2277 {
2278 resolved_plt = htab->elf.splt;
2279 plt_offset = h->plt.offset;
2280 }
2281 gotplt = htab->elf.sgotplt;
2282 }
2283 else
2284 {
2285 resolved_plt = htab->elf.iplt;
2286 plt_offset = h->plt.offset;
2287 gotplt = htab->elf.igotplt;
2288 }
2289
2290 switch (r_type)
2291 {
2292 default:
2293 break;
2294
2295 case R_386_GOT32:
2296 case R_386_GOT32X:
2297 base_got = htab->elf.sgot;
2298 off = h->got.offset;
2299
2300 if (base_got == NULL)
2301 abort ();
2302
2303 if (off == (bfd_vma) -1)
2304 {
2305 /* We can't use h->got.offset here to save state, or
2306 even just remember the offset, as finish_dynamic_symbol
2307 would use that as offset into .got. */
2308
2309 if (h->plt.offset == (bfd_vma) -1)
2310 abort ();
2311
2312 if (htab->elf.splt != NULL)
2313 {
2314 plt_index = (h->plt.offset / plt_entry_size
2315 - htab->plt.has_plt0);
2316 off = (plt_index + 3) * 4;
2317 base_got = htab->elf.sgotplt;
2318 }
2319 else
2320 {
2321 plt_index = h->plt.offset / plt_entry_size;
2322 off = plt_index * 4;
2323 base_got = htab->elf.igotplt;
2324 }
2325
2326 if (h->dynindx == -1
2327 || h->forced_local
2328 || info->symbolic)
2329 {
2330 /* This references the local defitionion. We must
2331 initialize this entry in the global offset table.
2332 Since the offset must always be a multiple of 4,
2333 we use the least significant bit to record
2334 whether we have initialized it already.
2335
2336 When doing a dynamic link, we create a .rela.got
2337 relocation entry to initialize the value. This
2338 is done in the finish_dynamic_symbol routine. */
2339 if ((off & 1) != 0)
2340 off &= ~1;
2341 else
2342 {
2343 bfd_put_32 (output_bfd, relocation,
2344 base_got->contents + off);
2345 h->got.offset |= 1;
2346 }
2347 }
2348
2349 relocation = off;
2350 }
2351 else
2352 relocation = (base_got->output_section->vma
2353 + base_got->output_offset + off
2354 - gotplt->output_section->vma
2355 - gotplt->output_offset);
2356
2357 if (rel->r_offset > 1
2358 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2359 && *(contents + rel->r_offset - 2) != 0x8d)
2360 {
2361 if (bfd_link_pic (info))
2362 goto disallow_got32;
2363
2364 /* Add the GOT base if there is no base register. */
2365 relocation += (gotplt->output_section->vma
2366 + gotplt->output_offset);
2367 }
2368 else if (htab->elf.splt == NULL)
2369 {
2370 /* Adjust for static executables. */
2371 relocation += gotplt->output_offset;
2372 }
2373
2374 goto do_relocation;
2375 }
2376
2377 if (h->plt.offset == (bfd_vma) -1)
2378 {
2379 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2380 if (r_type == R_386_32
2381 && (input_section->flags & SEC_CODE) == 0)
2382 goto do_ifunc_pointer;
2383 goto bad_ifunc_reloc;
2384 }
2385
2386 relocation = (resolved_plt->output_section->vma
2387 + resolved_plt->output_offset + plt_offset);
2388
2389 switch (r_type)
2390 {
2391 default:
2392 bad_ifunc_reloc:
2393 if (h->root.root.string)
2394 name = h->root.root.string;
2395 else
2396 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2397 NULL);
2398 _bfd_error_handler
2399 /* xgettext:c-format */
2400 (_("%pB: relocation %s against STT_GNU_IFUNC "
2401 "symbol `%s' isn't supported"), input_bfd,
2402 howto->name, name);
2403 bfd_set_error (bfd_error_bad_value);
2404 return false;
2405
2406 case R_386_32:
2407 /* Generate dynamic relcoation only when there is a
2408 non-GOT reference in a shared object. */
2409 if ((bfd_link_pic (info) && h->non_got_ref)
2410 || h->plt.offset == (bfd_vma) -1)
2411 {
2412 Elf_Internal_Rela outrel;
2413 asection *sreloc;
2414 bfd_vma offset;
2415
2416 do_ifunc_pointer:
2417 /* Need a dynamic relocation to get the real function
2418 adddress. */
2419 offset = _bfd_elf_section_offset (output_bfd,
2420 info,
2421 input_section,
2422 rel->r_offset);
2423 if (offset == (bfd_vma) -1
2424 || offset == (bfd_vma) -2)
2425 abort ();
2426
2427 outrel.r_offset = (input_section->output_section->vma
2428 + input_section->output_offset
2429 + offset);
2430
2431 if (POINTER_LOCAL_IFUNC_P (info, h))
2432 {
2433 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2434 h->root.root.string,
2435 h->root.u.def.section->owner);
2436
2437 /* This symbol is resolved locally. */
2438 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2439
2440 if (htab->params->report_relative_reloc)
2441 _bfd_x86_elf_link_report_relative_reloc
2442 (info, input_section, h, sym,
2443 "R_386_IRELATIVE", &outrel);
2444
2445 bfd_put_32 (output_bfd,
2446 (h->root.u.def.value
2447 + h->root.u.def.section->output_section->vma
2448 + h->root.u.def.section->output_offset),
2449 contents + offset);
2450 }
2451 else
2452 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2453
2454 /* Dynamic relocations are stored in
2455 1. .rel.ifunc section in PIC object.
2456 2. .rel.got section in dynamic executable.
2457 3. .rel.iplt section in static executable. */
2458 if (bfd_link_pic (info))
2459 sreloc = htab->elf.irelifunc;
2460 else if (htab->elf.splt != NULL)
2461 sreloc = htab->elf.srelgot;
2462 else
2463 sreloc = htab->elf.irelplt;
2464 elf_append_rel (output_bfd, sreloc, &outrel);
2465
2466 /* If this reloc is against an external symbol, we
2467 do not want to fiddle with the addend. Otherwise,
2468 we need to include the symbol value so that it
2469 becomes an addend for the dynamic reloc. For an
2470 internal symbol, we have updated addend. */
2471 continue;
2472 }
2473 /* FALLTHROUGH */
2474 case R_386_PC32:
2475 case R_386_PLT32:
2476 goto do_relocation;
2477
2478 case R_386_GOTOFF:
2479 /* NB: We can't use the PLT entry as the function address
2480 for PIC since the PIC register may not be set up
2481 properly for indirect call. */
2482 if (bfd_link_pic (info))
2483 goto bad_ifunc_reloc;
2484 relocation -= (gotplt->output_section->vma
2485 + gotplt->output_offset);
2486 goto do_relocation;
2487 }
2488 }
2489
2490 skip_ifunc:
2491 resolved_to_zero = (eh != NULL
2492 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2493
2494 switch (r_type)
2495 {
2496 case R_386_GOT32X:
2497 case R_386_GOT32:
2498 /* Relocation is to the entry for this symbol in the global
2499 offset table. */
2500 if (htab->elf.sgot == NULL)
2501 abort ();
2502
2503 relative_reloc = false;
2504 if (h != NULL)
2505 {
2506 off = h->got.offset;
2507 if (RESOLVED_LOCALLY_P (info, h, htab))
2508 {
2509 /* We must initialize this entry in the global offset
2510 table. Since the offset must always be a multiple
2511 of 4, we use the least significant bit to record
2512 whether we have initialized it already.
2513
2514 When doing a dynamic link, we create a .rel.got
2515 relocation entry to initialize the value. This
2516 is done in the finish_dynamic_symbol routine. */
2517 if ((off & 1) != 0)
2518 off &= ~1;
2519 else
2520 {
2521 bfd_put_32 (output_bfd, relocation,
2522 htab->elf.sgot->contents + off);
2523 h->got.offset |= 1;
2524 /* NB: Don't generate relative relocation here if
2525 it has been generated by DT_RELR. */
2526 if (!info->enable_dt_relr
2527 && GENERATE_RELATIVE_RELOC_P (info, h))
2528 {
2529 /* PR ld/21402: If this symbol isn't dynamic
2530 in PIC, generate R_386_RELATIVE here. */
2531 eh->no_finish_dynamic_symbol = 1;
2532 relative_reloc = true;
2533 }
2534 }
2535 }
2536 else
2537 unresolved_reloc = false;
2538 }
2539 else
2540 {
2541 if (local_got_offsets == NULL)
2542 abort ();
2543
2544 off = local_got_offsets[r_symndx];
2545
2546 /* The offset must always be a multiple of 4. We use
2547 the least significant bit to record whether we have
2548 already generated the necessary reloc. */
2549 if ((off & 1) != 0)
2550 off &= ~1;
2551 else
2552 {
2553 bfd_put_32 (output_bfd, relocation,
2554 htab->elf.sgot->contents + off);
2555 local_got_offsets[r_symndx] |= 1;
2556
2557 /* NB: Don't generate relative relocation here if it
2558 has been generated by DT_RELR. */
2559 if (!info->enable_dt_relr && bfd_link_pic (info))
2560 relative_reloc = true;
2561 }
2562 }
2563
2564 if (relative_reloc)
2565 {
2566 asection *s;
2567 Elf_Internal_Rela outrel;
2568
2569 s = htab->elf.srelgot;
2570 if (s == NULL)
2571 abort ();
2572
2573 outrel.r_offset = (htab->elf.sgot->output_section->vma
2574 + htab->elf.sgot->output_offset
2575 + off);
2576 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2577
2578 if (htab->params->report_relative_reloc)
2579 _bfd_x86_elf_link_report_relative_reloc
2580 (info, input_section, h, sym, "R_386_RELATIVE",
2581 &outrel);
2582
2583 elf_append_rel (output_bfd, s, &outrel);
2584 }
2585
2586 if (off >= (bfd_vma) -2)
2587 abort ();
2588
2589 relocation = (htab->elf.sgot->output_section->vma
2590 + htab->elf.sgot->output_offset + off);
2591 if (rel->r_offset > 1
2592 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2593 && *(contents + rel->r_offset - 2) != 0x8d)
2594 {
2595 if (bfd_link_pic (info))
2596 {
2597 /* For PIC, disallow R_386_GOT32 without a base
2598 register, except for "lea foo@GOT, %reg", since
2599 we don't know what the GOT base is. */
2600 const char *name;
2601
2602 disallow_got32:
2603 if (h == NULL || h->root.root.string == NULL)
2604 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2605 NULL);
2606 else
2607 name = h->root.root.string;
2608
2609 _bfd_error_handler
2610 /* xgettext:c-format */
2611 (_("%pB: direct GOT relocation %s against `%s'"
2612 " without base register can not be used"
2613 " when making a shared object"),
2614 input_bfd, howto->name, name);
2615 bfd_set_error (bfd_error_bad_value);
2616 return false;
2617 }
2618 }
2619 else
2620 {
2621 /* Subtract the .got.plt section address only with a base
2622 register. */
2623 relocation -= (htab->elf.sgotplt->output_section->vma
2624 + htab->elf.sgotplt->output_offset);
2625 }
2626
2627 break;
2628
2629 case R_386_GOTOFF:
2630 /* Relocation is relative to the start of the global offset
2631 table. */
2632
2633 /* Check to make sure it isn't a protected function or data
2634 symbol for shared library since it may not be local when
2635 used as function address or with copy relocation. We also
2636 need to make sure that a symbol is referenced locally. */
2637 if (!bfd_link_executable (info) && h)
2638 {
2639 if (!h->def_regular)
2640 {
2641 const char *v;
2642
2643 switch (ELF_ST_VISIBILITY (h->other))
2644 {
2645 case STV_HIDDEN:
2646 v = _("hidden symbol");
2647 break;
2648 case STV_INTERNAL:
2649 v = _("internal symbol");
2650 break;
2651 case STV_PROTECTED:
2652 v = _("protected symbol");
2653 break;
2654 default:
2655 v = _("symbol");
2656 break;
2657 }
2658
2659 _bfd_error_handler
2660 /* xgettext:c-format */
2661 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2662 " `%s' can not be used when making a shared object"),
2663 input_bfd, v, h->root.root.string);
2664 bfd_set_error (bfd_error_bad_value);
2665 return false;
2666 }
2667 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2668 && (h->type == STT_FUNC
2669 || h->type == STT_OBJECT)
2670 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2671 {
2672 _bfd_error_handler
2673 /* xgettext:c-format */
2674 (_("%pB: relocation R_386_GOTOFF against protected %s"
2675 " `%s' can not be used when making a shared object"),
2676 input_bfd,
2677 h->type == STT_FUNC ? "function" : "data",
2678 h->root.root.string);
2679 bfd_set_error (bfd_error_bad_value);
2680 return false;
2681 }
2682 }
2683
2684 /* Note that sgot is not involved in this
2685 calculation. We always want the start of .got.plt. If we
2686 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2687 permitted by the ABI, we might have to change this
2688 calculation. */
2689 relocation -= htab->elf.sgotplt->output_section->vma
2690 + htab->elf.sgotplt->output_offset;
2691 break;
2692
2693 case R_386_GOTPC:
2694 /* Use global offset table as symbol value. */
2695 relocation = htab->elf.sgotplt->output_section->vma
2696 + htab->elf.sgotplt->output_offset;
2697 unresolved_reloc = false;
2698 break;
2699
2700 case R_386_PLT32:
2701 /* Relocation is to the entry for this symbol in the
2702 procedure linkage table. */
2703
2704 /* Resolve a PLT32 reloc against a local symbol directly,
2705 without using the procedure linkage table. */
2706 if (h == NULL)
2707 break;
2708
2709 if ((h->plt.offset == (bfd_vma) -1
2710 && eh->plt_got.offset == (bfd_vma) -1)
2711 || htab->elf.splt == NULL)
2712 {
2713 /* We didn't make a PLT entry for this symbol. This
2714 happens when statically linking PIC code, or when
2715 using -Bsymbolic. */
2716 break;
2717 }
2718
2719 if (h->plt.offset != (bfd_vma) -1)
2720 {
2721 if (htab->plt_second != NULL)
2722 {
2723 resolved_plt = htab->plt_second;
2724 plt_offset = eh->plt_second.offset;
2725 }
2726 else
2727 {
2728 resolved_plt = htab->elf.splt;
2729 plt_offset = h->plt.offset;
2730 }
2731 }
2732 else
2733 {
2734 resolved_plt = htab->plt_got;
2735 plt_offset = eh->plt_got.offset;
2736 }
2737
2738 relocation = (resolved_plt->output_section->vma
2739 + resolved_plt->output_offset
2740 + plt_offset);
2741 unresolved_reloc = false;
2742 break;
2743
2744 case R_386_SIZE32:
2745 /* Set to symbol size. */
2746 relocation = st_size;
2747 /* Fall through. */
2748
2749 case R_386_32:
2750 case R_386_PC32:
2751 if ((input_section->flags & SEC_ALLOC) == 0
2752 || is_vxworks_tls)
2753 break;
2754
2755 if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type,
2756 sec, false,
2757 resolved_to_zero,
2758 (r_type == R_386_PC32)))
2759 {
2760 Elf_Internal_Rela outrel;
2761 bool skip, relocate;
2762 bool generate_dynamic_reloc = true;
2763 asection *sreloc;
2764
2765 /* When generating a shared object, these relocations
2766 are copied into the output file to be resolved at run
2767 time. */
2768
2769 skip = false;
2770 relocate = false;
2771
2772 outrel.r_offset =
2773 _bfd_elf_section_offset (output_bfd, info, input_section,
2774 rel->r_offset);
2775 if (outrel.r_offset == (bfd_vma) -1)
2776 skip = true;
2777 else if (outrel.r_offset == (bfd_vma) -2)
2778 skip = true, relocate = true;
2779 outrel.r_offset += (input_section->output_section->vma
2780 + input_section->output_offset);
2781
2782 if (skip)
2783 memset (&outrel, 0, sizeof outrel);
2784 else if (COPY_INPUT_RELOC_P (false, info, h, r_type))
2785 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2786 else
2787 {
2788 /* This symbol is local, or marked to become local. */
2789 relocate = true;
2790 /* NB: Don't generate relative relocation here if it
2791 has been generated by DT_RELR. */
2792 if (info->enable_dt_relr)
2793 generate_dynamic_reloc = false;
2794 else
2795 {
2796 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2797
2798 if (htab->params->report_relative_reloc)
2799 _bfd_x86_elf_link_report_relative_reloc
2800 (info, input_section, h, sym, "R_386_RELATIVE",
2801 &outrel);
2802 }
2803 }
2804
2805 if (generate_dynamic_reloc)
2806 {
2807 sreloc = elf_section_data (input_section)->sreloc;
2808
2809 if (sreloc == NULL || sreloc->contents == NULL)
2810 {
2811 r = bfd_reloc_notsupported;
2812 goto check_relocation_error;
2813 }
2814
2815 elf_append_rel (output_bfd, sreloc, &outrel);
2816 }
2817
2818 /* If this reloc is against an external symbol, we do
2819 not want to fiddle with the addend. Otherwise, we
2820 need to include the symbol value so that it becomes
2821 an addend for the dynamic reloc. */
2822 if (! relocate)
2823 continue;
2824 }
2825 break;
2826
2827 case R_386_TLS_IE:
2828 if (!bfd_link_executable (info))
2829 {
2830 Elf_Internal_Rela outrel;
2831 asection *sreloc;
2832
2833 outrel.r_offset = rel->r_offset
2834 + input_section->output_section->vma
2835 + input_section->output_offset;
2836 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2837
2838 if (htab->params->report_relative_reloc)
2839 _bfd_x86_elf_link_report_relative_reloc
2840 (info, input_section, h, sym, "R_386_RELATIVE",
2841 &outrel);
2842
2843 sreloc = elf_section_data (input_section)->sreloc;
2844 if (sreloc == NULL)
2845 abort ();
2846 elf_append_rel (output_bfd, sreloc, &outrel);
2847 }
2848 /* Fall through */
2849
2850 case R_386_TLS_GD:
2851 case R_386_TLS_GOTDESC:
2852 case R_386_TLS_DESC_CALL:
2853 case R_386_TLS_IE_32:
2854 case R_386_TLS_GOTIE:
2855 tls_type = GOT_UNKNOWN;
2856 if (h == NULL && local_got_offsets)
2857 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2858 else if (h != NULL)
2859 tls_type = elf_x86_hash_entry(h)->tls_type;
2860 if (tls_type == GOT_TLS_IE)
2861 tls_type = GOT_TLS_IE_NEG;
2862
2863 r_type_tls = r_type;
2864 if (! elf_i386_tls_transition (info, input_bfd,
2865 input_section, contents,
2866 symtab_hdr, sym_hashes,
2867 &r_type_tls, tls_type, rel,
2868 relend, h, r_symndx, true))
2869 return false;
2870
2871 expected_tls_le = htab->elf.target_os == is_solaris
2872 ? R_386_TLS_LE : R_386_TLS_LE_32;
2873 if (r_type_tls == expected_tls_le)
2874 {
2875 /* NB: Solaris only supports R_386_TLS_GD->R_386_TLS_LE. */
2876 BFD_ASSERT (! unresolved_reloc
2877 && (htab->elf.target_os != is_solaris
2878 || (htab->elf.target_os == is_solaris
2879 && (r_type == R_386_TLS_GD
2880 || r_type == R_386_TLS_IE
2881 || r_type == R_386_TLS_GOTIE))));
2882 if (r_type == R_386_TLS_GD)
2883 {
2884 unsigned int type;
2885 bfd_vma roff;
2886
2887 /* GD->LE transition. */
2888 type = *(contents + rel->r_offset - 2);
2889 if (type == 0x04)
2890 {
2891 /* Change
2892 leal foo@tlsgd(,%ebx,1), %eax
2893 call ___tls_get_addr@PLT
2894 into:
2895 movl %gs:0, %eax
2896 subl $foo@tpoff, %eax
2897 (6 byte form of subl). */
2898 roff = rel->r_offset + 5;
2899 }
2900 else
2901 {
2902 /* Change
2903 leal foo@tlsgd(%ebx), %eax
2904 call ___tls_get_addr@PLT
2905 nop
2906 or
2907 leal foo@tlsgd(%reg), %eax
2908 call *___tls_get_addr@GOT(%reg)
2909 which may be converted to
2910 addr32 call ___tls_get_addr
2911 into:
2912 movl %gs:0, %eax; subl $foo@tpoff, %eax
2913 (6 byte form of subl). */
2914 roff = rel->r_offset + 6;
2915 }
2916 memcpy (contents + roff - 8,
2917 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2918 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2919 contents + roff);
2920 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2921 rel++;
2922 wrel++;
2923 continue;
2924 }
2925 else if (r_type == R_386_TLS_GOTDESC)
2926 {
2927 /* GDesc -> LE transition.
2928 It's originally something like:
2929 leal x@tlsdesc(%ebx), %eax
2930
2931 leal x@ntpoff, %eax
2932
2933 Registers other than %eax may be set up here. */
2934
2935 unsigned int val;
2936 bfd_vma roff;
2937
2938 roff = rel->r_offset;
2939 val = bfd_get_8 (input_bfd, contents + roff - 1);
2940
2941 /* Now modify the instruction as appropriate. */
2942 /* aoliva FIXME: remove the above and xor the byte
2943 below with 0x86. */
2944 bfd_put_8 (output_bfd, val ^ 0x86,
2945 contents + roff - 1);
2946 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2947 contents + roff);
2948 continue;
2949 }
2950 else if (r_type == R_386_TLS_DESC_CALL)
2951 {
2952 /* GDesc -> LE transition.
2953 It's originally:
2954 call *(%eax)
2955 Turn it into:
2956 xchg %ax,%ax */
2957
2958 bfd_vma roff;
2959
2960 roff = rel->r_offset;
2961 bfd_put_8 (output_bfd, 0x66, contents + roff);
2962 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2963 continue;
2964 }
2965 else if (r_type == R_386_TLS_IE)
2966 {
2967 unsigned int val;
2968
2969 /* IE->LE transition:
2970 Originally it can be one of:
2971 movl foo, %eax
2972 movl foo, %reg
2973 addl foo, %reg
2974 We change it into:
2975 movl $foo, %eax
2976 movl $foo, %reg
2977 addl $foo, %reg. */
2978 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2979 if (val == 0xa1)
2980 {
2981 /* movl foo, %eax. */
2982 bfd_put_8 (output_bfd, 0xb8,
2983 contents + rel->r_offset - 1);
2984 }
2985 else
2986 {
2987 unsigned int type;
2988
2989 type = bfd_get_8 (input_bfd,
2990 contents + rel->r_offset - 2);
2991 switch (type)
2992 {
2993 case 0x8b:
2994 /* movl */
2995 bfd_put_8 (output_bfd, 0xc7,
2996 contents + rel->r_offset - 2);
2997 bfd_put_8 (output_bfd,
2998 0xc0 | ((val >> 3) & 7),
2999 contents + rel->r_offset - 1);
3000 break;
3001 case 0x03:
3002 /* addl */
3003 bfd_put_8 (output_bfd, 0x81,
3004 contents + rel->r_offset - 2);
3005 bfd_put_8 (output_bfd,
3006 0xc0 | ((val >> 3) & 7),
3007 contents + rel->r_offset - 1);
3008 break;
3009 default:
3010 BFD_FAIL ();
3011 break;
3012 }
3013 }
3014 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3015 contents + rel->r_offset);
3016 continue;
3017 }
3018 else
3019 {
3020 unsigned int val, type;
3021
3022 /* {IE_32,GOTIE}->LE transition:
3023 Originally it can be one of:
3024 subl foo(%reg1), %reg2
3025 movl foo(%reg1), %reg2
3026 addl foo(%reg1), %reg2
3027 We change it into:
3028 subl $foo, %reg2
3029 movl $foo, %reg2 (6 byte form)
3030 addl $foo, %reg2. */
3031 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3032 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3033 if (type == 0x8b)
3034 {
3035 /* movl */
3036 bfd_put_8 (output_bfd, 0xc7,
3037 contents + rel->r_offset - 2);
3038 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3039 contents + rel->r_offset - 1);
3040 }
3041 else if (type == 0x2b)
3042 {
3043 /* subl */
3044 bfd_put_8 (output_bfd, 0x81,
3045 contents + rel->r_offset - 2);
3046 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3047 contents + rel->r_offset - 1);
3048 }
3049 else if (type == 0x03)
3050 {
3051 /* addl */
3052 bfd_put_8 (output_bfd, 0x81,
3053 contents + rel->r_offset - 2);
3054 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3055 contents + rel->r_offset - 1);
3056 }
3057 else
3058 BFD_FAIL ();
3059 if (r_type == R_386_TLS_GOTIE)
3060 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3061 contents + rel->r_offset);
3062 else
3063 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3064 contents + rel->r_offset);
3065 continue;
3066 }
3067 }
3068
3069 if (htab->elf.sgot == NULL)
3070 abort ();
3071
3072 if (h != NULL)
3073 {
3074 off = h->got.offset;
3075 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3076 }
3077 else
3078 {
3079 if (local_got_offsets == NULL)
3080 abort ();
3081
3082 off = local_got_offsets[r_symndx];
3083 offplt = local_tlsdesc_gotents[r_symndx];
3084 }
3085
3086 if ((off & 1) != 0)
3087 off &= ~1;
3088 else
3089 {
3090 Elf_Internal_Rela outrel;
3091 int dr_type;
3092 asection *sreloc;
3093
3094 if (htab->elf.srelgot == NULL)
3095 abort ();
3096
3097 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3098
3099 if (GOT_TLS_GDESC_P (tls_type))
3100 {
3101 bfd_byte *loc;
3102 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3103 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3104 <= htab->elf.sgotplt->size);
3105 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3106 + htab->elf.sgotplt->output_offset
3107 + offplt
3108 + htab->sgotplt_jump_table_size);
3109 sreloc = htab->elf.srelplt;
3110 loc = sreloc->contents;
3111 loc += (htab->next_tls_desc_index++
3112 * sizeof (Elf32_External_Rel));
3113 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3114 <= sreloc->contents + sreloc->size);
3115 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3116 if (indx == 0)
3117 {
3118 BFD_ASSERT (! unresolved_reloc);
3119 bfd_put_32 (output_bfd,
3120 relocation - _bfd_x86_elf_dtpoff_base (info),
3121 htab->elf.sgotplt->contents + offplt
3122 + htab->sgotplt_jump_table_size + 4);
3123 }
3124 else
3125 {
3126 bfd_put_32 (output_bfd, 0,
3127 htab->elf.sgotplt->contents + offplt
3128 + htab->sgotplt_jump_table_size + 4);
3129 }
3130 }
3131
3132 sreloc = htab->elf.srelgot;
3133
3134 outrel.r_offset = (htab->elf.sgot->output_section->vma
3135 + htab->elf.sgot->output_offset + off);
3136
3137 if (GOT_TLS_GD_P (tls_type))
3138 dr_type = R_386_TLS_DTPMOD32;
3139 else if (GOT_TLS_GDESC_P (tls_type))
3140 goto dr_done;
3141 else if (tls_type == GOT_TLS_IE_POS)
3142 dr_type = R_386_TLS_TPOFF;
3143 else
3144 dr_type = R_386_TLS_TPOFF32;
3145
3146 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3147 bfd_put_32 (output_bfd,
3148 relocation - _bfd_x86_elf_dtpoff_base (info),
3149 htab->elf.sgot->contents + off);
3150 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3151 bfd_put_32 (output_bfd,
3152 _bfd_x86_elf_dtpoff_base (info) - relocation,
3153 htab->elf.sgot->contents + off);
3154 else if (dr_type != R_386_TLS_DESC)
3155 bfd_put_32 (output_bfd, 0,
3156 htab->elf.sgot->contents + off);
3157 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3158
3159 elf_append_rel (output_bfd, sreloc, &outrel);
3160
3161 if (GOT_TLS_GD_P (tls_type))
3162 {
3163 if (indx == 0)
3164 {
3165 BFD_ASSERT (! unresolved_reloc);
3166 bfd_put_32 (output_bfd,
3167 relocation - _bfd_x86_elf_dtpoff_base (info),
3168 htab->elf.sgot->contents + off + 4);
3169 }
3170 else
3171 {
3172 bfd_put_32 (output_bfd, 0,
3173 htab->elf.sgot->contents + off + 4);
3174 outrel.r_info = ELF32_R_INFO (indx,
3175 R_386_TLS_DTPOFF32);
3176 outrel.r_offset += 4;
3177 elf_append_rel (output_bfd, sreloc, &outrel);
3178 }
3179 }
3180 else if (tls_type == GOT_TLS_IE_BOTH)
3181 {
3182 bfd_put_32 (output_bfd,
3183 (indx == 0
3184 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3185 : 0),
3186 htab->elf.sgot->contents + off + 4);
3187 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3188 outrel.r_offset += 4;
3189 elf_append_rel (output_bfd, sreloc, &outrel);
3190 }
3191
3192 dr_done:
3193 if (h != NULL)
3194 h->got.offset |= 1;
3195 else
3196 local_got_offsets[r_symndx] |= 1;
3197 }
3198
3199 if (off >= (bfd_vma) -2
3200 && ! GOT_TLS_GDESC_P (tls_type))
3201 abort ();
3202 if (r_type_tls == R_386_TLS_GOTDESC
3203 || r_type_tls == R_386_TLS_DESC_CALL)
3204 {
3205 relocation = htab->sgotplt_jump_table_size + offplt;
3206 unresolved_reloc = false;
3207 }
3208 else if (r_type_tls == r_type)
3209 {
3210 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3211 + htab->elf.sgotplt->output_offset;
3212 relocation = htab->elf.sgot->output_section->vma
3213 + htab->elf.sgot->output_offset + off - g_o_t;
3214 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3215 && tls_type == GOT_TLS_IE_BOTH)
3216 relocation += 4;
3217 if (r_type == R_386_TLS_IE)
3218 relocation += g_o_t;
3219 unresolved_reloc = false;
3220 }
3221 else if (r_type == R_386_TLS_GD)
3222 {
3223 unsigned int val, type;
3224 bfd_vma roff;
3225
3226 /* GD->IE transition. */
3227 type = *(contents + rel->r_offset - 2);
3228 val = *(contents + rel->r_offset - 1);
3229 if (type == 0x04)
3230 {
3231 /* Change
3232 leal foo@tlsgd(,%ebx,1), %eax
3233 call ___tls_get_addr@PLT
3234 into:
3235 movl %gs:0, %eax
3236 subl $foo@gottpoff(%ebx), %eax. */
3237 val >>= 3;
3238 roff = rel->r_offset - 3;
3239 }
3240 else
3241 {
3242 /* Change
3243 leal foo@tlsgd(%ebx), %eax
3244 call ___tls_get_addr@PLT
3245 nop
3246 or
3247 leal foo@tlsgd(%reg), %eax
3248 call *___tls_get_addr@GOT(%reg)
3249 which may be converted to
3250 addr32 call ___tls_get_addr
3251 into:
3252 movl %gs:0, %eax;
3253 subl $foo@gottpoff(%reg), %eax. */
3254 roff = rel->r_offset - 2;
3255 }
3256 memcpy (contents + roff,
3257 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3258 contents[roff + 7] = 0x80 | (val & 7);
3259 /* If foo is used only with foo@gotntpoff(%reg) and
3260 foo@indntpoff, but not with foo@gottpoff(%reg), change
3261 subl $foo@gottpoff(%reg), %eax
3262 into:
3263 addl $foo@gotntpoff(%reg), %eax. */
3264 if (tls_type == GOT_TLS_IE_POS)
3265 contents[roff + 6] = 0x03;
3266 bfd_put_32 (output_bfd,
3267 htab->elf.sgot->output_section->vma
3268 + htab->elf.sgot->output_offset + off
3269 - htab->elf.sgotplt->output_section->vma
3270 - htab->elf.sgotplt->output_offset,
3271 contents + roff + 8);
3272 /* Skip R_386_PLT32 and R_386_GOT32X. */
3273 rel++;
3274 wrel++;
3275 continue;
3276 }
3277 else if (r_type == R_386_TLS_GOTDESC)
3278 {
3279 /* GDesc -> IE transition.
3280 It's originally something like:
3281 leal x@tlsdesc(%ebx), %eax
3282
3283 Change it to:
3284 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3285 or:
3286 movl x@gottpoff(%ebx), %eax # before negl %eax
3287
3288 Registers other than %eax may be set up here. */
3289
3290 bfd_vma roff;
3291
3292 /* First, make sure it's a leal adding ebx to a 32-bit
3293 offset into any register, although it's probably
3294 almost always going to be eax. */
3295 roff = rel->r_offset;
3296
3297 /* Now modify the instruction as appropriate. */
3298 /* To turn a leal into a movl in the form we use it, it
3299 suffices to change the first byte from 0x8d to 0x8b.
3300 aoliva FIXME: should we decide to keep the leal, all
3301 we have to do is remove the statement below, and
3302 adjust the relaxation of R_386_TLS_DESC_CALL. */
3303 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3304
3305 if (tls_type == GOT_TLS_IE_BOTH)
3306 off += 4;
3307
3308 bfd_put_32 (output_bfd,
3309 htab->elf.sgot->output_section->vma
3310 + htab->elf.sgot->output_offset + off
3311 - htab->elf.sgotplt->output_section->vma
3312 - htab->elf.sgotplt->output_offset,
3313 contents + roff);
3314 continue;
3315 }
3316 else if (r_type == R_386_TLS_DESC_CALL)
3317 {
3318 /* GDesc -> IE transition.
3319 It's originally:
3320 call *(%eax)
3321
3322 Change it to:
3323 xchg %ax,%ax
3324 or
3325 negl %eax
3326 depending on how we transformed the TLS_GOTDESC above.
3327 */
3328
3329 bfd_vma roff;
3330
3331 roff = rel->r_offset;
3332
3333 /* Now modify the instruction as appropriate. */
3334 if (tls_type != GOT_TLS_IE_NEG)
3335 {
3336 /* xchg %ax,%ax */
3337 bfd_put_8 (output_bfd, 0x66, contents + roff);
3338 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3339 }
3340 else
3341 {
3342 /* negl %eax */
3343 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3344 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3345 }
3346
3347 continue;
3348 }
3349 else
3350 BFD_ASSERT (false);
3351 break;
3352
3353 case R_386_TLS_LDM:
3354 if (! elf_i386_tls_transition (info, input_bfd,
3355 input_section, contents,
3356 symtab_hdr, sym_hashes,
3357 &r_type, GOT_UNKNOWN, rel,
3358 relend, h, r_symndx, true))
3359 return false;
3360
3361 if (r_type != R_386_TLS_LDM)
3362 {
3363 /* LD->LE transition. Change
3364 leal foo@tlsldm(%ebx) %eax
3365 call ___tls_get_addr@PLT
3366 into:
3367 movl %gs:0, %eax
3368 nop
3369 leal 0(%esi,1), %esi
3370 or change
3371 leal foo@tlsldm(%reg) %eax
3372 call *___tls_get_addr@GOT(%reg)
3373 which may be converted to
3374 addr32 call ___tls_get_addr
3375 into:
3376 movl %gs:0, %eax
3377 leal 0(%esi), %esi */
3378 expected_tls_le = htab->elf.target_os == is_solaris
3379 ? R_386_TLS_LE : R_386_TLS_LE_32;
3380 BFD_ASSERT (r_type == expected_tls_le);
3381 if (*(contents + rel->r_offset + 4) == 0xff
3382 || *(contents + rel->r_offset + 4) == 0x67)
3383 memcpy (contents + rel->r_offset - 2,
3384 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3385 else
3386 memcpy (contents + rel->r_offset - 2,
3387 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3388 /* Skip R_386_PC32/R_386_PLT32. */
3389 rel++;
3390 wrel++;
3391 continue;
3392 }
3393
3394 if (htab->elf.sgot == NULL)
3395 abort ();
3396
3397 off = htab->tls_ld_or_ldm_got.offset;
3398 if (off & 1)
3399 off &= ~1;
3400 else
3401 {
3402 Elf_Internal_Rela outrel;
3403
3404 if (htab->elf.srelgot == NULL)
3405 abort ();
3406
3407 outrel.r_offset = (htab->elf.sgot->output_section->vma
3408 + htab->elf.sgot->output_offset + off);
3409
3410 bfd_put_32 (output_bfd, 0,
3411 htab->elf.sgot->contents + off);
3412 bfd_put_32 (output_bfd, 0,
3413 htab->elf.sgot->contents + off + 4);
3414 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3415 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3416 htab->tls_ld_or_ldm_got.offset |= 1;
3417 }
3418 relocation = htab->elf.sgot->output_section->vma
3419 + htab->elf.sgot->output_offset + off
3420 - htab->elf.sgotplt->output_section->vma
3421 - htab->elf.sgotplt->output_offset;
3422 unresolved_reloc = false;
3423 break;
3424
3425 case R_386_TLS_LDO_32:
3426 if (!bfd_link_executable (info)
3427 || (input_section->flags & SEC_CODE) == 0)
3428 relocation -= _bfd_x86_elf_dtpoff_base (info);
3429 else
3430 /* When converting LDO to LE, we must negate. */
3431 relocation = -elf_i386_tpoff (info, relocation);
3432 break;
3433
3434 case R_386_TLS_LE_32:
3435 case R_386_TLS_LE:
3436 if (!bfd_link_executable (info))
3437 {
3438 Elf_Internal_Rela outrel;
3439 asection *sreloc;
3440
3441 outrel.r_offset = rel->r_offset
3442 + input_section->output_section->vma
3443 + input_section->output_offset;
3444 if (h != NULL && h->dynindx != -1)
3445 indx = h->dynindx;
3446 else
3447 indx = 0;
3448 if (r_type == R_386_TLS_LE_32)
3449 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3450 else
3451 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3452 sreloc = elf_section_data (input_section)->sreloc;
3453 if (sreloc == NULL)
3454 abort ();
3455 elf_append_rel (output_bfd, sreloc, &outrel);
3456 if (indx)
3457 continue;
3458 else if (r_type == R_386_TLS_LE_32)
3459 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3460 else
3461 relocation -= _bfd_x86_elf_dtpoff_base (info);
3462 }
3463 else if (r_type == R_386_TLS_LE_32)
3464 relocation = elf_i386_tpoff (info, relocation);
3465 else
3466 relocation = -elf_i386_tpoff (info, relocation);
3467 break;
3468
3469 default:
3470 break;
3471 }
3472
3473 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3474 because such sections are not SEC_ALLOC and thus ld.so will
3475 not process them. */
3476 if (unresolved_reloc
3477 && !((input_section->flags & SEC_DEBUGGING) != 0
3478 && h->def_dynamic)
3479 && _bfd_elf_section_offset (output_bfd, info, input_section,
3480 rel->r_offset) != (bfd_vma) -1)
3481 {
3482 _bfd_error_handler
3483 /* xgettext:c-format */
3484 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3485 input_bfd,
3486 input_section,
3487 (uint64_t) rel->r_offset,
3488 howto->name,
3489 h->root.root.string);
3490 return false;
3491 }
3492
3493 do_relocation:
3494 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3495 contents, rel->r_offset,
3496 relocation, 0);
3497
3498 check_relocation_error:
3499 if (r != bfd_reloc_ok)
3500 {
3501 const char *name;
3502
3503 if (h != NULL)
3504 name = h->root.root.string;
3505 else
3506 {
3507 name = bfd_elf_string_from_elf_section (input_bfd,
3508 symtab_hdr->sh_link,
3509 sym->st_name);
3510 if (name == NULL)
3511 return false;
3512 if (*name == '\0')
3513 name = bfd_section_name (sec);
3514 }
3515
3516 if (r == bfd_reloc_overflow)
3517 (*info->callbacks->reloc_overflow)
3518 (info, (h ? &h->root : NULL), name, howto->name,
3519 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3520 else
3521 {
3522 _bfd_error_handler
3523 /* xgettext:c-format */
3524 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3525 input_bfd, input_section,
3526 (uint64_t) rel->r_offset, name, (int) r);
3527 return false;
3528 }
3529 }
3530
3531 if (wrel != rel)
3532 *wrel = *rel;
3533 }
3534
3535 if (wrel != rel)
3536 {
3537 Elf_Internal_Shdr *rel_hdr;
3538 size_t deleted = rel - wrel;
3539
3540 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3541 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3542 if (rel_hdr->sh_size == 0)
3543 {
3544 /* It is too late to remove an empty reloc section. Leave
3545 one NONE reloc.
3546 ??? What is wrong with an empty section??? */
3547 rel_hdr->sh_size = rel_hdr->sh_entsize;
3548 deleted -= 1;
3549 }
3550 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3551 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3552 input_section->reloc_count -= deleted;
3553 }
3554
3555 return true;
3556 }
3557
3558 /* Finish up dynamic symbol handling. We set the contents of various
3559 dynamic sections here. */
3560
3561 static bool
3562 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3563 struct bfd_link_info *info,
3564 struct elf_link_hash_entry *h,
3565 Elf_Internal_Sym *sym)
3566 {
3567 struct elf_x86_link_hash_table *htab;
3568 unsigned plt_entry_size;
3569 struct elf_x86_link_hash_entry *eh;
3570 bool local_undefweak;
3571 bool use_plt_second;
3572
3573 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3574 if (htab == NULL)
3575 return false;
3576
3577 plt_entry_size = htab->plt.plt_entry_size;
3578
3579 /* Use the second PLT section only if there is .plt section. */
3580 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3581
3582 eh = (struct elf_x86_link_hash_entry *) h;
3583 if (eh->no_finish_dynamic_symbol)
3584 abort ();
3585
3586 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3587 resolved undefined weak symbols in executable so that their
3588 references have value 0 at run-time. */
3589 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3590
3591 if (h->plt.offset != (bfd_vma) -1)
3592 {
3593 bfd_vma plt_index, plt_offset;
3594 bfd_vma got_offset;
3595 Elf_Internal_Rela rel;
3596 bfd_byte *loc;
3597 asection *plt, *resolved_plt, *gotplt, *relplt;
3598
3599 /* When building a static executable, use .iplt, .igot.plt and
3600 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3601 if (htab->elf.splt != NULL)
3602 {
3603 plt = htab->elf.splt;
3604 gotplt = htab->elf.sgotplt;
3605 relplt = htab->elf.srelplt;
3606 }
3607 else
3608 {
3609 plt = htab->elf.iplt;
3610 gotplt = htab->elf.igotplt;
3611 relplt = htab->elf.irelplt;
3612 }
3613
3614 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3615
3616 /* Get the index in the procedure linkage table which
3617 corresponds to this symbol. This is the index of this symbol
3618 in all the symbols for which we are making plt entries. The
3619 first entry in the procedure linkage table is reserved.
3620
3621 Get the offset into the .got table of the entry that
3622 corresponds to this function. Each .got entry is 4 bytes.
3623 The first three are reserved.
3624
3625 For static executables, we don't reserve anything. */
3626
3627 if (plt == htab->elf.splt)
3628 {
3629 got_offset = (h->plt.offset / plt_entry_size
3630 - htab->plt.has_plt0);
3631 got_offset = (got_offset + 3) * 4;
3632 }
3633 else
3634 {
3635 got_offset = h->plt.offset / plt_entry_size;
3636 got_offset = got_offset * 4;
3637 }
3638
3639 /* Fill in the entry in the procedure linkage table and update
3640 the first slot. */
3641 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3642 plt_entry_size);
3643
3644 if (use_plt_second)
3645 {
3646 const bfd_byte *plt_entry;
3647 if (bfd_link_pic (info))
3648 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3649 else
3650 plt_entry = htab->non_lazy_plt->plt_entry;
3651 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3652 plt_entry, htab->non_lazy_plt->plt_entry_size);
3653
3654 resolved_plt = htab->plt_second;
3655 plt_offset = eh->plt_second.offset;
3656 }
3657 else
3658 {
3659 resolved_plt = plt;
3660 plt_offset = h->plt.offset;
3661 }
3662
3663 if (! bfd_link_pic (info))
3664 {
3665 bfd_put_32 (output_bfd,
3666 (gotplt->output_section->vma
3667 + gotplt->output_offset
3668 + got_offset),
3669 resolved_plt->contents + plt_offset
3670 + htab->plt.plt_got_offset);
3671
3672 if (htab->elf.target_os == is_vxworks)
3673 {
3674 int s, k, reloc_index;
3675
3676 /* Create the R_386_32 relocation referencing the GOT
3677 for this PLT entry. */
3678
3679 /* S: Current slot number (zero-based). */
3680 s = ((h->plt.offset - htab->plt.plt_entry_size)
3681 / htab->plt.plt_entry_size);
3682 /* K: Number of relocations for PLTResolve. */
3683 if (bfd_link_pic (info))
3684 k = PLTRESOLVE_RELOCS_SHLIB;
3685 else
3686 k = PLTRESOLVE_RELOCS;
3687 /* Skip the PLTresolve relocations, and the relocations for
3688 the other PLT slots. */
3689 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3690 loc = (htab->srelplt2->contents + reloc_index
3691 * sizeof (Elf32_External_Rel));
3692
3693 rel.r_offset = (plt->output_section->vma
3694 + plt->output_offset
3695 + h->plt.offset + 2),
3696 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3697 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3698
3699 /* Create the R_386_32 relocation referencing the beginning of
3700 the PLT for this GOT entry. */
3701 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3702 + htab->elf.sgotplt->output_offset
3703 + got_offset);
3704 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3705 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3706 loc + sizeof (Elf32_External_Rel));
3707 }
3708 }
3709 else
3710 {
3711 bfd_put_32 (output_bfd, got_offset,
3712 resolved_plt->contents + plt_offset
3713 + htab->plt.plt_got_offset);
3714 }
3715
3716 /* Fill in the entry in the global offset table. Leave the entry
3717 as zero for undefined weak symbol in PIE. No PLT relocation
3718 against undefined weak symbol in PIE. */
3719 if (!local_undefweak)
3720 {
3721 if (htab->plt.has_plt0)
3722 bfd_put_32 (output_bfd,
3723 (plt->output_section->vma
3724 + plt->output_offset
3725 + h->plt.offset
3726 + htab->lazy_plt->plt_lazy_offset),
3727 gotplt->contents + got_offset);
3728
3729 /* Fill in the entry in the .rel.plt section. */
3730 rel.r_offset = (gotplt->output_section->vma
3731 + gotplt->output_offset
3732 + got_offset);
3733 if (PLT_LOCAL_IFUNC_P (info, h))
3734 {
3735 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3736 h->root.root.string,
3737 h->root.u.def.section->owner);
3738
3739 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3740 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3741 in the .got.plt section. */
3742 bfd_put_32 (output_bfd,
3743 (h->root.u.def.value
3744 + h->root.u.def.section->output_section->vma
3745 + h->root.u.def.section->output_offset),
3746 gotplt->contents + got_offset);
3747 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3748
3749 if (htab->params->report_relative_reloc)
3750 _bfd_x86_elf_link_report_relative_reloc
3751 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3752
3753 /* R_386_IRELATIVE comes last. */
3754 plt_index = htab->next_irelative_index--;
3755 }
3756 else
3757 {
3758 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3759 plt_index = htab->next_jump_slot_index++;
3760 }
3761
3762 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3763 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3764
3765 /* Don't fill the second and third slots in PLT entry for
3766 static executables nor without PLT0. */
3767 if (plt == htab->elf.splt && htab->plt.has_plt0)
3768 {
3769 bfd_put_32 (output_bfd,
3770 plt_index * sizeof (Elf32_External_Rel),
3771 plt->contents + h->plt.offset
3772 + htab->lazy_plt->plt_reloc_offset);
3773 bfd_put_32 (output_bfd,
3774 - (h->plt.offset
3775 + htab->lazy_plt->plt_plt_offset + 4),
3776 (plt->contents + h->plt.offset
3777 + htab->lazy_plt->plt_plt_offset));
3778 }
3779 }
3780 }
3781 else if (eh->plt_got.offset != (bfd_vma) -1)
3782 {
3783 bfd_vma got_offset, plt_offset;
3784 asection *plt, *got, *gotplt;
3785 const bfd_byte *got_plt_entry;
3786
3787 /* Set the entry in the GOT procedure linkage table. */
3788 plt = htab->plt_got;
3789 got = htab->elf.sgot;
3790 gotplt = htab->elf.sgotplt;
3791 got_offset = h->got.offset;
3792
3793 if (got_offset == (bfd_vma) -1
3794 || plt == NULL
3795 || got == NULL
3796 || gotplt == NULL)
3797 abort ();
3798
3799 /* Fill in the entry in the GOT procedure linkage table. */
3800 if (! bfd_link_pic (info))
3801 {
3802 got_plt_entry = htab->non_lazy_plt->plt_entry;
3803 got_offset += got->output_section->vma + got->output_offset;
3804 }
3805 else
3806 {
3807 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3808 got_offset += (got->output_section->vma
3809 + got->output_offset
3810 - gotplt->output_section->vma
3811 - gotplt->output_offset);
3812 }
3813
3814 plt_offset = eh->plt_got.offset;
3815 memcpy (plt->contents + plt_offset, got_plt_entry,
3816 htab->non_lazy_plt->plt_entry_size);
3817 bfd_put_32 (output_bfd, got_offset,
3818 (plt->contents + plt_offset
3819 + htab->non_lazy_plt->plt_got_offset));
3820 }
3821
3822 if (!local_undefweak
3823 && !h->def_regular
3824 && (h->plt.offset != (bfd_vma) -1
3825 || eh->plt_got.offset != (bfd_vma) -1))
3826 {
3827 /* Mark the symbol as undefined, rather than as defined in
3828 the .plt section. Leave the value if there were any
3829 relocations where pointer equality matters (this is a clue
3830 for the dynamic linker, to make function pointer
3831 comparisons work between an application and shared
3832 library), otherwise set it to zero. If a function is only
3833 called from a binary, there is no need to slow down
3834 shared libraries because of that. */
3835 sym->st_shndx = SHN_UNDEF;
3836 if (!h->pointer_equality_needed)
3837 sym->st_value = 0;
3838 }
3839
3840 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3841
3842 /* Don't generate dynamic GOT relocation against undefined weak
3843 symbol in executable. */
3844 if (h->got.offset != (bfd_vma) -1
3845 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3846 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3847 && !local_undefweak)
3848 {
3849 Elf_Internal_Rela rel;
3850 asection *relgot = htab->elf.srelgot;
3851 const char *relative_reloc_name = NULL;
3852 bool generate_dynamic_reloc = true;
3853
3854 /* This symbol has an entry in the global offset table. Set it
3855 up. */
3856
3857 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3858 abort ();
3859
3860 rel.r_offset = (htab->elf.sgot->output_section->vma
3861 + htab->elf.sgot->output_offset
3862 + (h->got.offset & ~(bfd_vma) 1));
3863
3864 /* If this is a static link, or it is a -Bsymbolic link and the
3865 symbol is defined locally or was forced to be local because
3866 of a version file, we just want to emit a RELATIVE reloc.
3867 The entry in the global offset table will already have been
3868 initialized in the relocate_section function. */
3869 if (h->def_regular
3870 && h->type == STT_GNU_IFUNC)
3871 {
3872 if (h->plt.offset == (bfd_vma) -1)
3873 {
3874 /* STT_GNU_IFUNC is referenced without PLT. */
3875 if (htab->elf.splt == NULL)
3876 {
3877 /* use .rel[a].iplt section to store .got relocations
3878 in static executable. */
3879 relgot = htab->elf.irelplt;
3880 }
3881 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3882 {
3883 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3884 h->root.root.string,
3885 h->root.u.def.section->owner);
3886
3887 bfd_put_32 (output_bfd,
3888 (h->root.u.def.value
3889 + h->root.u.def.section->output_section->vma
3890 + h->root.u.def.section->output_offset),
3891 htab->elf.sgot->contents + h->got.offset);
3892 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3893 relative_reloc_name = "R_386_IRELATIVE";
3894 }
3895 else
3896 goto do_glob_dat;
3897 }
3898 else if (bfd_link_pic (info))
3899 {
3900 /* Generate R_386_GLOB_DAT. */
3901 goto do_glob_dat;
3902 }
3903 else
3904 {
3905 asection *plt;
3906 bfd_vma plt_offset;
3907
3908 if (!h->pointer_equality_needed)
3909 abort ();
3910
3911 /* For non-shared object, we can't use .got.plt, which
3912 contains the real function addres if we need pointer
3913 equality. We load the GOT entry with the PLT entry. */
3914 if (htab->plt_second != NULL)
3915 {
3916 plt = htab->plt_second;
3917 plt_offset = eh->plt_second.offset;
3918 }
3919 else
3920 {
3921 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3922 plt_offset = h->plt.offset;
3923 }
3924 bfd_put_32 (output_bfd,
3925 (plt->output_section->vma
3926 + plt->output_offset + plt_offset),
3927 htab->elf.sgot->contents + h->got.offset);
3928 return true;
3929 }
3930 }
3931 else if (bfd_link_pic (info)
3932 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3933 {
3934 BFD_ASSERT((h->got.offset & 1) != 0);
3935 if (info->enable_dt_relr)
3936 generate_dynamic_reloc = false;
3937 else
3938 {
3939 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3940 relative_reloc_name = "R_386_RELATIVE";
3941 }
3942 }
3943 else
3944 {
3945 BFD_ASSERT((h->got.offset & 1) == 0);
3946 do_glob_dat:
3947 bfd_put_32 (output_bfd, (bfd_vma) 0,
3948 htab->elf.sgot->contents + h->got.offset);
3949 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3950 }
3951
3952 if (generate_dynamic_reloc)
3953 {
3954 if (relative_reloc_name != NULL
3955 && htab->params->report_relative_reloc)
3956 _bfd_x86_elf_link_report_relative_reloc
3957 (info, relgot, h, sym, relative_reloc_name, &rel);
3958
3959 elf_append_rel (output_bfd, relgot, &rel);
3960 }
3961 }
3962
3963 if (h->needs_copy)
3964 {
3965 Elf_Internal_Rela rel;
3966 asection *s;
3967
3968 /* This symbol needs a copy reloc. Set it up. */
3969 VERIFY_COPY_RELOC (h, htab)
3970
3971 rel.r_offset = (h->root.u.def.value
3972 + h->root.u.def.section->output_section->vma
3973 + h->root.u.def.section->output_offset);
3974 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3975 if (h->root.u.def.section == htab->elf.sdynrelro)
3976 s = htab->elf.sreldynrelro;
3977 else
3978 s = htab->elf.srelbss;
3979 elf_append_rel (output_bfd, s, &rel);
3980 }
3981
3982 return true;
3983 }
3984
3985 /* Finish up local dynamic symbol handling. We set the contents of
3986 various dynamic sections here. */
3987
3988 static int
3989 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3990 {
3991 struct elf_link_hash_entry *h
3992 = (struct elf_link_hash_entry *) *slot;
3993 struct bfd_link_info *info
3994 = (struct bfd_link_info *) inf;
3995
3996 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3997 h, NULL);
3998 }
3999
4000 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4001 here since undefined weak symbol may not be dynamic and may not be
4002 called for elf_i386_finish_dynamic_symbol. */
4003
4004 static bool
4005 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4006 void *inf)
4007 {
4008 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4009 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4010
4011 if (h->root.type != bfd_link_hash_undefweak
4012 || h->dynindx != -1)
4013 return true;
4014
4015 return elf_i386_finish_dynamic_symbol (info->output_bfd,
4016 info, h, NULL);
4017 }
4018
4019 /* Used to decide how to sort relocs in an optimal manner for the
4020 dynamic linker, before writing them out. */
4021
4022 static enum elf_reloc_type_class
4023 elf_i386_reloc_type_class (const struct bfd_link_info *info,
4024 const asection *rel_sec ATTRIBUTE_UNUSED,
4025 const Elf_Internal_Rela *rela)
4026 {
4027 bfd *abfd = info->output_bfd;
4028 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4029 struct elf_link_hash_table *htab = elf_hash_table (info);
4030
4031 if (htab->dynsym != NULL
4032 && htab->dynsym->contents != NULL)
4033 {
4034 /* Check relocation against STT_GNU_IFUNC symbol if there are
4035 dynamic symbols. */
4036 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4037 if (r_symndx != STN_UNDEF)
4038 {
4039 Elf_Internal_Sym sym;
4040 if (!bed->s->swap_symbol_in (abfd,
4041 (htab->dynsym->contents
4042 + r_symndx * sizeof (Elf32_External_Sym)),
4043 0, &sym))
4044 abort ();
4045
4046 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4047 return reloc_class_ifunc;
4048 }
4049 }
4050
4051 switch (ELF32_R_TYPE (rela->r_info))
4052 {
4053 case R_386_IRELATIVE:
4054 return reloc_class_ifunc;
4055 case R_386_RELATIVE:
4056 return reloc_class_relative;
4057 case R_386_JUMP_SLOT:
4058 return reloc_class_plt;
4059 case R_386_COPY:
4060 return reloc_class_copy;
4061 default:
4062 return reloc_class_normal;
4063 }
4064 }
4065
4066 /* Finish up the dynamic sections. */
4067
4068 static bool
4069 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4070 struct bfd_link_info *info)
4071 {
4072 struct elf_x86_link_hash_table *htab;
4073
4074 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4075 if (htab == NULL)
4076 return false;
4077
4078 if (!htab->elf.dynamic_sections_created)
4079 return true;
4080
4081 if (htab->elf.splt && htab->elf.splt->size > 0)
4082 {
4083 if (bfd_is_abs_section (htab->elf.splt->output_section))
4084 {
4085 info->callbacks->einfo
4086 (_("%F%P: discarded output section: `%pA'\n"),
4087 htab->elf.splt);
4088 return false;
4089 }
4090
4091 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4092 really seem like the right value. */
4093 elf_section_data (htab->elf.splt->output_section)
4094 ->this_hdr.sh_entsize = 4;
4095
4096 if (htab->plt.has_plt0)
4097 {
4098 /* Fill in the special first entry in the procedure linkage
4099 table. */
4100 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4101 htab->lazy_plt->plt0_entry_size);
4102 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4103 htab->plt0_pad_byte,
4104 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4105 if (!bfd_link_pic (info))
4106 {
4107 bfd_put_32 (output_bfd,
4108 (htab->elf.sgotplt->output_section->vma
4109 + htab->elf.sgotplt->output_offset
4110 + 4),
4111 htab->elf.splt->contents
4112 + htab->lazy_plt->plt0_got1_offset);
4113 bfd_put_32 (output_bfd,
4114 (htab->elf.sgotplt->output_section->vma
4115 + htab->elf.sgotplt->output_offset
4116 + 8),
4117 htab->elf.splt->contents
4118 + htab->lazy_plt->plt0_got2_offset);
4119
4120 if (htab->elf.target_os == is_vxworks)
4121 {
4122 Elf_Internal_Rela rel;
4123 int num_plts = (htab->elf.splt->size
4124 / htab->plt.plt_entry_size) - 1;
4125 unsigned char *p;
4126 asection *srelplt2 = htab->srelplt2;
4127
4128 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4129 + 4. On IA32 we use REL relocations so the
4130 addend goes in the PLT directly. */
4131 rel.r_offset = (htab->elf.splt->output_section->vma
4132 + htab->elf.splt->output_offset
4133 + htab->lazy_plt->plt0_got1_offset);
4134 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4135 R_386_32);
4136 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4137 srelplt2->contents);
4138 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4139 + 8. */
4140 rel.r_offset = (htab->elf.splt->output_section->vma
4141 + htab->elf.splt->output_offset
4142 + htab->lazy_plt->plt0_got2_offset);
4143 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4144 R_386_32);
4145 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4146 srelplt2->contents +
4147 sizeof (Elf32_External_Rel));
4148 /* Correct the .rel.plt.unloaded relocations. */
4149 p = srelplt2->contents;
4150 if (bfd_link_pic (info))
4151 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4152 else
4153 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4154
4155 for (; num_plts; num_plts--)
4156 {
4157 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4158 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4159 R_386_32);
4160 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4161 p += sizeof (Elf32_External_Rel);
4162
4163 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4164 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4165 R_386_32);
4166 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4167 p += sizeof (Elf32_External_Rel);
4168 }
4169 }
4170 }
4171 }
4172 }
4173
4174 /* Fill PLT entries for undefined weak symbols in PIE. */
4175 if (bfd_link_pie (info))
4176 bfd_hash_traverse (&info->hash->table,
4177 elf_i386_pie_finish_undefweak_symbol,
4178 info);
4179
4180 return true;
4181 }
4182
4183 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4184 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4185 It has to be done before elf_link_sort_relocs is called so that
4186 dynamic relocations are properly sorted. */
4187
4188 static bool
4189 elf_i386_output_arch_local_syms
4190 (bfd *output_bfd ATTRIBUTE_UNUSED,
4191 struct bfd_link_info *info,
4192 void *flaginfo ATTRIBUTE_UNUSED,
4193 int (*func) (void *, const char *,
4194 Elf_Internal_Sym *,
4195 asection *,
4196 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4197 {
4198 struct elf_x86_link_hash_table *htab
4199 = elf_x86_hash_table (info, I386_ELF_DATA);
4200 if (htab == NULL)
4201 return false;
4202
4203 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4204 htab_traverse (htab->loc_hash_table,
4205 elf_i386_finish_local_dynamic_symbol,
4206 info);
4207
4208 return true;
4209 }
4210
4211 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4212 dynamic relocations. */
4213
4214 static long
4215 elf_i386_get_synthetic_symtab (bfd *abfd,
4216 long symcount ATTRIBUTE_UNUSED,
4217 asymbol **syms ATTRIBUTE_UNUSED,
4218 long dynsymcount,
4219 asymbol **dynsyms,
4220 asymbol **ret)
4221 {
4222 long count, i, n;
4223 int j;
4224 bfd_byte *plt_contents;
4225 long relsize;
4226 const struct elf_x86_lazy_plt_layout *lazy_plt;
4227 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4228 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4229 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4230 asection *plt;
4231 bfd_vma got_addr;
4232 enum elf_x86_plt_type plt_type;
4233 struct elf_x86_plt plts[] =
4234 {
4235 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4236 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4237 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4238 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4239 };
4240
4241 *ret = NULL;
4242
4243 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4244 return 0;
4245
4246 if (dynsymcount <= 0)
4247 return 0;
4248
4249 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4250 if (relsize <= 0)
4251 return -1;
4252
4253 non_lazy_plt = NULL;
4254 /* Silence GCC 6. */
4255 lazy_plt = NULL;
4256 non_lazy_ibt_plt = NULL;
4257 lazy_ibt_plt = NULL;
4258 switch (get_elf_backend_data (abfd)->target_os)
4259 {
4260 case is_normal:
4261 case is_solaris:
4262 non_lazy_plt = &elf_i386_non_lazy_plt;
4263 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4264 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4265 /* Fall through */
4266 case is_vxworks:
4267 lazy_plt = &elf_i386_lazy_plt;
4268 break;
4269 default:
4270 abort ();
4271 }
4272
4273 got_addr = 0;
4274
4275 count = 0;
4276 for (j = 0; plts[j].name != NULL; j++)
4277 {
4278 plt = bfd_get_section_by_name (abfd, plts[j].name);
4279 if (plt == NULL || plt->size == 0)
4280 continue;
4281
4282 /* Get the PLT section contents. */
4283 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4284 if (plt_contents == NULL)
4285 break;
4286 if (!bfd_get_section_contents (abfd, (asection *) plt,
4287 plt_contents, 0, plt->size))
4288 {
4289 free (plt_contents);
4290 break;
4291 }
4292
4293 /* Check what kind of PLT it is. */
4294 plt_type = plt_unknown;
4295 if (plts[j].type == plt_unknown
4296 && (plt->size >= (lazy_plt->plt0_entry_size
4297 + lazy_plt->plt_entry_size)))
4298 {
4299 /* Match lazy PLT first. */
4300 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4301 lazy_plt->plt0_got1_offset) == 0)
4302 {
4303 /* The fist entry in the lazy IBT PLT is the same as the
4304 normal lazy PLT. */
4305 if (lazy_ibt_plt != NULL
4306 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4307 lazy_ibt_plt->plt_entry,
4308 lazy_ibt_plt->plt_got_offset) == 0))
4309 plt_type = plt_lazy | plt_second;
4310 else
4311 plt_type = plt_lazy;
4312 }
4313 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4314 lazy_plt->plt0_got1_offset) == 0)
4315 {
4316 /* The fist entry in the PIC lazy IBT PLT is the same as
4317 the normal PIC lazy PLT. */
4318 if (lazy_ibt_plt != NULL
4319 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4320 lazy_ibt_plt->pic_plt_entry,
4321 lazy_ibt_plt->plt_got_offset) == 0))
4322 plt_type = plt_lazy | plt_pic | plt_second;
4323 else
4324 plt_type = plt_lazy | plt_pic;
4325 }
4326 }
4327
4328 if (non_lazy_plt != NULL
4329 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4330 && plt->size >= non_lazy_plt->plt_entry_size)
4331 {
4332 /* Match non-lazy PLT. */
4333 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4334 non_lazy_plt->plt_got_offset) == 0)
4335 plt_type = plt_non_lazy;
4336 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4337 non_lazy_plt->plt_got_offset) == 0)
4338 plt_type = plt_pic;
4339 }
4340
4341 if ((non_lazy_ibt_plt != NULL)
4342 && (plt_type == plt_unknown || plt_type == plt_second)
4343 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4344 {
4345 if (memcmp (plt_contents,
4346 non_lazy_ibt_plt->plt_entry,
4347 non_lazy_ibt_plt->plt_got_offset) == 0)
4348 {
4349 /* Match IBT PLT. */
4350 plt_type = plt_second;
4351 non_lazy_plt = non_lazy_ibt_plt;
4352 }
4353 else if (memcmp (plt_contents,
4354 non_lazy_ibt_plt->pic_plt_entry,
4355 non_lazy_ibt_plt->plt_got_offset) == 0)
4356 {
4357 /* Match PIC IBT PLT. */
4358 plt_type = plt_second | plt_pic;
4359 non_lazy_plt = non_lazy_ibt_plt;
4360 }
4361 }
4362
4363 if (plt_type == plt_unknown)
4364 {
4365 free (plt_contents);
4366 continue;
4367 }
4368
4369 plts[j].sec = plt;
4370 plts[j].type = plt_type;
4371
4372 if ((plt_type & plt_lazy))
4373 {
4374 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4375 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4376 /* Skip PLT0 in lazy PLT. */
4377 i = 1;
4378 }
4379 else
4380 {
4381 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4382 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4383 i = 0;
4384 }
4385
4386 /* Skip lazy PLT when the second PLT is used. */
4387 if ((plt_type & (plt_lazy | plt_second))
4388 == (plt_lazy | plt_second))
4389 plts[j].count = 0;
4390 else
4391 {
4392 n = plt->size / plts[j].plt_entry_size;
4393 plts[j].count = n;
4394 count += n - i;
4395 }
4396
4397 plts[j].contents = plt_contents;
4398
4399 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4400 if ((plt_type & plt_pic))
4401 got_addr = (bfd_vma) -1;
4402 }
4403
4404 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4405 got_addr, plts, dynsyms,
4406 ret);
4407 }
4408
4409 /* Set up i386 GNU properties. Return the first relocatable ELF input
4410 with GNU properties if found. Otherwise, return NULL. */
4411
4412 static bfd *
4413 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4414 {
4415 struct elf_x86_init_table init_table;
4416
4417 switch (get_elf_backend_data (info->output_bfd)->target_os)
4418 {
4419 case is_normal:
4420 case is_solaris:
4421 init_table.plt0_pad_byte = 0x0;
4422 init_table.lazy_plt = &elf_i386_lazy_plt;
4423 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4424 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4425 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4426 break;
4427 case is_vxworks:
4428 init_table.plt0_pad_byte = 0x90;
4429 init_table.lazy_plt = &elf_i386_lazy_plt;
4430 init_table.non_lazy_plt = NULL;
4431 init_table.lazy_ibt_plt = NULL;
4432 init_table.non_lazy_ibt_plt = NULL;
4433 break;
4434 default:
4435 abort ();
4436 }
4437
4438 init_table.r_info = elf32_r_info;
4439 init_table.r_sym = elf32_r_sym;
4440
4441 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4442 }
4443
4444 #define TARGET_LITTLE_SYM i386_elf32_vec
4445 #define TARGET_LITTLE_NAME "elf32-i386"
4446 #define ELF_ARCH bfd_arch_i386
4447 #define ELF_TARGET_ID I386_ELF_DATA
4448 #define ELF_MACHINE_CODE EM_386
4449 #define ELF_MAXPAGESIZE 0x1000
4450
4451 #define elf_backend_can_gc_sections 1
4452 #define elf_backend_can_refcount 1
4453 #define elf_backend_want_got_plt 1
4454 #define elf_backend_plt_readonly 1
4455 #define elf_backend_want_plt_sym 0
4456 #define elf_backend_got_header_size 12
4457 #define elf_backend_plt_alignment 4
4458 #define elf_backend_dtrel_excludes_plt 1
4459 #define elf_backend_caches_rawsize 1
4460 #define elf_backend_want_dynrelro 1
4461
4462 /* Support RELA for objdump of prelink objects. */
4463 #define elf_info_to_howto elf_i386_info_to_howto_rel
4464 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4465
4466 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4467 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4468 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4469 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4470
4471 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4472 #define elf_backend_always_size_sections elf_i386_always_size_sections
4473 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4474 #define elf_backend_fake_sections elf_i386_fake_sections
4475 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4476 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4477 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4478 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4479 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4480 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4481 #define elf_backend_relocate_section elf_i386_relocate_section
4482 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4483 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4484
4485 #define elf_backend_linux_prpsinfo32_ugid16 true
4486
4487 #define elf32_bed elf32_i386_bed
4488
4489 #include "elf32-target.h"
4490
4491 /* FreeBSD support. */
4492
4493 #undef TARGET_LITTLE_SYM
4494 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4495 #undef TARGET_LITTLE_NAME
4496 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4497 #undef ELF_OSABI
4498 #define ELF_OSABI ELFOSABI_FREEBSD
4499
4500 /* The kernel recognizes executables as valid only if they carry a
4501 "FreeBSD" label in the ELF header. So we put this label on all
4502 executables and (for simplicity) also all other object files. */
4503
4504 static bool
4505 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4506 {
4507 if (!_bfd_elf_init_file_header (abfd, info))
4508 return false;
4509
4510 #ifdef OLD_FREEBSD_ABI_LABEL
4511 {
4512 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4513 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4514 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4515 }
4516 #endif
4517 return true;
4518 }
4519
4520 #undef elf_backend_init_file_header
4521 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4522 #undef elf32_bed
4523 #define elf32_bed elf32_i386_fbsd_bed
4524
4525 #undef elf_backend_add_symbol_hook
4526
4527 #include "elf32-target.h"
4528
4529 #undef elf_backend_init_file_header
4530
4531 /* Solaris 2. */
4532
4533 #undef TARGET_LITTLE_SYM
4534 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4535 #undef TARGET_LITTLE_NAME
4536 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4537
4538 #undef ELF_TARGET_OS
4539 #define ELF_TARGET_OS is_solaris
4540
4541 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4542 objects won't be recognized. */
4543 #undef ELF_OSABI
4544
4545 #undef elf32_bed
4546 #define elf32_bed elf32_i386_sol2_bed
4547
4548 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4549 boundary. */
4550 #undef elf_backend_static_tls_alignment
4551 #define elf_backend_static_tls_alignment 8
4552
4553 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4554
4555 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4556 File, p.63. */
4557 #undef elf_backend_want_plt_sym
4558 #define elf_backend_want_plt_sym 1
4559
4560 #undef elf_backend_strtab_flags
4561 #define elf_backend_strtab_flags SHF_STRINGS
4562
4563 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4564 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4565 FALSE otherwise. ISECTION is the best guess matching section from the
4566 input bfd IBFD, but it might be NULL. */
4567
4568 static bool
4569 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4570 bfd *obfd ATTRIBUTE_UNUSED,
4571 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4572 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4573 {
4574 /* PR 19938: FIXME: Need to add code for setting the sh_info
4575 and sh_link fields of Solaris specific section types. */
4576 return false;
4577
4578 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4579 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4580
4581 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4582
4583 The following values should be set:
4584
4585 Type Link Info
4586 -----------------------------------------------------------------------------
4587 SHT_SUNW_ancillary The section header index of 0
4588 [0x6fffffee] the associated string table.
4589
4590 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4591 [0x6ffffff0] the associated symbol table. section header index of
4592 the associated
4593 SHT_SUNW_capchain table,
4594 otherwise 0.
4595
4596 SHT_SUNW_symsort The section header index of 0
4597 [0x6ffffff1] the associated symbol table.
4598
4599 SHT_SUNW_tlssort The section header index of 0
4600 [0x6ffffff2] the associated symbol table.
4601
4602 SHT_SUNW_LDYNSYM The section header index of One greater than the
4603 [0x6ffffff3] the associated string table. symbol table index of the
4604 This index is the same string last local symbol,
4605 table used by the SHT_DYNSYM STB_LOCAL. Since
4606 section. SHT_SUNW_LDYNSYM only
4607 contains local symbols,
4608 sh_info is equivalent to
4609 the number of symbols in
4610 the table.
4611
4612 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4613 [0x6ffffff5] the section header index of to named strings, the
4614 the associated section header index of
4615 SHT_SUNW_capinfo table, the associated string
4616 otherwise 0. table, otherwise 0.
4617
4618 SHT_SUNW_move The section header index of 0
4619 [0x6ffffffa] the associated symbol table.
4620
4621 SHT_SUNW_COMDAT 0 0
4622 [0x6ffffffb]
4623
4624 SHT_SUNW_syminfo The section header index of The section header index
4625 [0x6ffffffc] the associated symbol table. of the associated
4626 .dynamic section.
4627
4628 SHT_SUNW_verdef The section header index of The number of version
4629 [0x6ffffffd] the associated string table. definitions within the
4630 section.
4631
4632 SHT_SUNW_verneed The section header index of The number of version
4633 [0x6ffffffe] the associated string table. dependencies within the
4634 section.
4635
4636 SHT_SUNW_versym The section header index of 0
4637 [0x6fffffff] the associated symbol table. */
4638 }
4639
4640 #undef elf_backend_copy_special_section_fields
4641 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4642
4643 #include "elf32-target.h"
4644
4645 /* Intel MCU support. */
4646
4647 static bool
4648 elf32_iamcu_elf_object_p (bfd *abfd)
4649 {
4650 /* Set the right machine number for an IAMCU elf32 file. */
4651 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4652 return true;
4653 }
4654
4655 #undef TARGET_LITTLE_SYM
4656 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4657 #undef TARGET_LITTLE_NAME
4658 #define TARGET_LITTLE_NAME "elf32-iamcu"
4659 #undef ELF_ARCH
4660 #define ELF_ARCH bfd_arch_iamcu
4661
4662 #undef ELF_MACHINE_CODE
4663 #define ELF_MACHINE_CODE EM_IAMCU
4664
4665 #undef ELF_TARGET_OS
4666 #undef ELF_OSABI
4667
4668 #undef elf32_bed
4669 #define elf32_bed elf32_iamcu_bed
4670
4671 #undef elf_backend_object_p
4672 #define elf_backend_object_p elf32_iamcu_elf_object_p
4673
4674 #undef elf_backend_static_tls_alignment
4675
4676 #undef elf_backend_want_plt_sym
4677 #define elf_backend_want_plt_sym 0
4678
4679 #undef elf_backend_strtab_flags
4680 #undef elf_backend_copy_special_section_fields
4681
4682 #include "elf32-target.h"
4683
4684 /* Restore defaults. */
4685 #undef ELF_ARCH
4686 #define ELF_ARCH bfd_arch_i386
4687 #undef ELF_MACHINE_CODE
4688 #define ELF_MACHINE_CODE EM_386
4689 #undef elf_backend_object_p
4690
4691 /* VxWorks support. */
4692
4693 #undef TARGET_LITTLE_SYM
4694 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4695 #undef TARGET_LITTLE_NAME
4696 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4697 #undef ELF_OSABI
4698 #undef ELF_MAXPAGESIZE
4699 #define ELF_MAXPAGESIZE 0x1000
4700 #undef elf_backend_plt_alignment
4701 #define elf_backend_plt_alignment 4
4702
4703 #undef ELF_TARGET_OS
4704 #define ELF_TARGET_OS is_vxworks
4705
4706 #undef elf_backend_relocs_compatible
4707 #undef elf_backend_add_symbol_hook
4708 #define elf_backend_add_symbol_hook \
4709 elf_vxworks_add_symbol_hook
4710 #undef elf_backend_link_output_symbol_hook
4711 #define elf_backend_link_output_symbol_hook \
4712 elf_vxworks_link_output_symbol_hook
4713 #undef elf_backend_emit_relocs
4714 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4715 #undef elf_backend_final_write_processing
4716 #define elf_backend_final_write_processing \
4717 elf_vxworks_final_write_processing
4718 #undef elf_backend_static_tls_alignment
4719
4720 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4721 define it. */
4722 #undef elf_backend_want_plt_sym
4723 #define elf_backend_want_plt_sym 1
4724
4725 #undef elf32_bed
4726 #define elf32_bed elf32_i386_vxworks_bed
4727
4728 #include "elf32-target.h"