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x86: Add elf_x86_allocate_local_got_info
[binutils-gdb.git] / bfd / elf32-i386.c
1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2022 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, 3, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 1, 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, 1, 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, 0, 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, 0, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 2, 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, 3, 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, 2, 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, 2, 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, 2, 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 2, /* size (0 = byte, 1 = short, 2 = long) */
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 2, /* size (0 = byte, 1 = short, 2 = long) */
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_check_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 else
968 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
969 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
970
971 case R_386_TLS_IE:
972 /* Check transition from IE access model:
973 movl foo@indntpoff(%rip), %eax
974 movl foo@indntpoff(%rip), %reg
975 addl foo@indntpoff(%rip), %reg
976 */
977
978 if (offset < 1 || (offset + 4) > sec->size)
979 return false;
980
981 /* Check "movl foo@tpoff(%rip), %eax" first. */
982 val = bfd_get_8 (abfd, contents + offset - 1);
983 if (val == 0xa1)
984 return true;
985
986 if (offset < 2)
987 return false;
988
989 /* Check movl|addl foo@tpoff(%rip), %reg. */
990 type = bfd_get_8 (abfd, contents + offset - 2);
991 return ((type == 0x8b || type == 0x03)
992 && (val & 0xc7) == 0x05);
993
994 case R_386_TLS_GOTIE:
995 case R_386_TLS_IE_32:
996 /* Check transition from {IE_32,GOTIE} access model:
997 subl foo@{tpoff,gontoff}(%reg1), %reg2
998 movl foo@{tpoff,gontoff}(%reg1), %reg2
999 addl foo@{tpoff,gontoff}(%reg1), %reg2
1000 */
1001
1002 if (offset < 2 || (offset + 4) > sec->size)
1003 return false;
1004
1005 val = bfd_get_8 (abfd, contents + offset - 1);
1006 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1007 return false;
1008
1009 type = bfd_get_8 (abfd, contents + offset - 2);
1010 return type == 0x8b || type == 0x2b || type == 0x03;
1011
1012 case R_386_TLS_GOTDESC:
1013 /* Check transition from GDesc access model:
1014 leal x@tlsdesc(%ebx), %eax
1015
1016 Make sure it's a leal adding ebx to a 32-bit offset
1017 into any register, although it's probably almost always
1018 going to be eax. */
1019
1020 if (offset < 2 || (offset + 4) > sec->size)
1021 return false;
1022
1023 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1024 return false;
1025
1026 val = bfd_get_8 (abfd, contents + offset - 1);
1027 return (val & 0xc7) == 0x83;
1028
1029 case R_386_TLS_DESC_CALL:
1030 /* Check transition from GDesc access model:
1031 call *x@tlsdesc(%eax)
1032 */
1033 if (offset + 2 <= sec->size)
1034 {
1035 /* Make sure that it's a call *x@tlsdesc(%eax). */
1036 call = contents + offset;
1037 return call[0] == 0xff && call[1] == 0x10;
1038 }
1039
1040 return false;
1041
1042 default:
1043 abort ();
1044 }
1045 }
1046
1047 /* Return TRUE if the TLS access transition is OK or no transition
1048 will be performed. Update R_TYPE if there is a transition. */
1049
1050 static bool
1051 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1052 asection *sec, bfd_byte *contents,
1053 Elf_Internal_Shdr *symtab_hdr,
1054 struct elf_link_hash_entry **sym_hashes,
1055 unsigned int *r_type, int tls_type,
1056 const Elf_Internal_Rela *rel,
1057 const Elf_Internal_Rela *relend,
1058 struct elf_link_hash_entry *h,
1059 unsigned long r_symndx,
1060 bool from_relocate_section)
1061 {
1062 unsigned int from_type = *r_type;
1063 unsigned int to_type = from_type;
1064 bool check = true;
1065
1066 /* Skip TLS transition for functions. */
1067 if (h != NULL
1068 && (h->type == STT_FUNC
1069 || h->type == STT_GNU_IFUNC))
1070 return true;
1071
1072 switch (from_type)
1073 {
1074 case R_386_TLS_GD:
1075 case R_386_TLS_GOTDESC:
1076 case R_386_TLS_DESC_CALL:
1077 case R_386_TLS_IE_32:
1078 case R_386_TLS_IE:
1079 case R_386_TLS_GOTIE:
1080 if (bfd_link_executable (info))
1081 {
1082 if (h == NULL)
1083 to_type = R_386_TLS_LE_32;
1084 else if (from_type != R_386_TLS_IE
1085 && from_type != R_386_TLS_GOTIE)
1086 to_type = R_386_TLS_IE_32;
1087 }
1088
1089 /* When we are called from elf_i386_relocate_section, there may
1090 be additional transitions based on TLS_TYPE. */
1091 if (from_relocate_section)
1092 {
1093 unsigned int new_to_type = to_type;
1094
1095 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1096 new_to_type = R_386_TLS_LE_32;
1097
1098 if (to_type == R_386_TLS_GD
1099 || to_type == R_386_TLS_GOTDESC
1100 || to_type == R_386_TLS_DESC_CALL)
1101 {
1102 if (tls_type == GOT_TLS_IE_POS)
1103 new_to_type = R_386_TLS_GOTIE;
1104 else if (tls_type & GOT_TLS_IE)
1105 new_to_type = R_386_TLS_IE_32;
1106 }
1107
1108 /* We checked the transition before when we were called from
1109 elf_i386_check_relocs. We only want to check the new
1110 transition which hasn't been checked before. */
1111 check = new_to_type != to_type && from_type == to_type;
1112 to_type = new_to_type;
1113 }
1114
1115 break;
1116
1117 case R_386_TLS_LDM:
1118 if (bfd_link_executable (info))
1119 to_type = R_386_TLS_LE_32;
1120 break;
1121
1122 default:
1123 return true;
1124 }
1125
1126 /* Return TRUE if there is no transition. */
1127 if (from_type == to_type)
1128 return true;
1129
1130 /* Check if the transition can be performed. */
1131 if (check
1132 && ! elf_i386_check_tls_transition (sec, contents,
1133 symtab_hdr, sym_hashes,
1134 from_type, rel, relend))
1135 {
1136 reloc_howto_type *from, *to;
1137 const char *name;
1138
1139 from = elf_i386_rtype_to_howto (from_type);
1140 to = elf_i386_rtype_to_howto (to_type);
1141
1142 if (h)
1143 name = h->root.root.string;
1144 else
1145 {
1146 struct elf_x86_link_hash_table *htab;
1147
1148 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1149 if (htab == NULL)
1150 name = "*unknown*";
1151 else
1152 {
1153 Elf_Internal_Sym *isym;
1154
1155 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1156 abfd, r_symndx);
1157 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1158 }
1159 }
1160
1161 _bfd_error_handler
1162 /* xgettext:c-format */
1163 (_("%pB: TLS transition from %s to %s against `%s'"
1164 " at %#" PRIx64 " in section `%pA' failed"),
1165 abfd, from->name, to->name, name,
1166 (uint64_t) rel->r_offset, sec);
1167 bfd_set_error (bfd_error_bad_value);
1168 return false;
1169 }
1170
1171 *r_type = to_type;
1172 return true;
1173 }
1174
1175 /* With the local symbol, foo, we convert
1176 mov foo@GOT[(%reg1)], %reg2
1177 to
1178 lea foo[@GOTOFF(%reg1)], %reg2
1179 and convert
1180 call/jmp *foo@GOT[(%reg)]
1181 to
1182 nop call foo/jmp foo nop
1183 When PIC is false, convert
1184 test %reg1, foo@GOT[(%reg2)]
1185 to
1186 test $foo, %reg1
1187 and convert
1188 binop foo@GOT[(%reg1)], %reg2
1189 to
1190 binop $foo, %reg2
1191 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1192 instructions. */
1193
1194 static
1195 bool
1196 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1197 bfd_byte *contents,
1198 unsigned int *r_type_p,
1199 Elf_Internal_Rela *irel,
1200 struct elf_link_hash_entry *h,
1201 bool *converted,
1202 struct bfd_link_info *link_info)
1203 {
1204 struct elf_x86_link_hash_table *htab;
1205 unsigned int opcode;
1206 unsigned int modrm;
1207 bool baseless;
1208 Elf_Internal_Sym *isym;
1209 unsigned int addend;
1210 unsigned int nop;
1211 bfd_vma nop_offset;
1212 bool is_pic;
1213 bool to_reloc_32;
1214 bool abs_symbol;
1215 unsigned int r_type;
1216 unsigned int r_symndx;
1217 bfd_vma roff = irel->r_offset;
1218 bool local_ref;
1219 struct elf_x86_link_hash_entry *eh;
1220
1221 if (roff < 2)
1222 return true;
1223
1224 /* Addend for R_386_GOT32X relocations must be 0. */
1225 addend = bfd_get_32 (abfd, contents + roff);
1226 if (addend != 0)
1227 return true;
1228
1229 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1230 is_pic = bfd_link_pic (link_info);
1231
1232 r_type = *r_type_p;
1233 r_symndx = ELF32_R_SYM (irel->r_info);
1234
1235 modrm = bfd_get_8 (abfd, contents + roff - 1);
1236 baseless = (modrm & 0xc7) == 0x5;
1237
1238 if (h)
1239 {
1240 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1241 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1242 isym = NULL;
1243 abs_symbol = ABS_SYMBOL_P (h);
1244 }
1245 else
1246 {
1247 local_ref = true;
1248 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache, abfd,
1249 r_symndx);
1250 abs_symbol = isym->st_shndx == SHN_ABS;
1251 }
1252
1253 if (baseless && is_pic)
1254 {
1255 /* For PIC, disallow R_386_GOT32X without a base register
1256 since we don't know what the GOT base is. */
1257 const char *name;
1258
1259 if (h == NULL)
1260 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1261 else
1262 name = h->root.root.string;
1263
1264 _bfd_error_handler
1265 /* xgettext:c-format */
1266 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1267 " register can not be used when making a shared object"),
1268 abfd, name);
1269 return false;
1270 }
1271
1272 opcode = bfd_get_8 (abfd, contents + roff - 2);
1273
1274 /* Convert to R_386_32 if PIC is false or there is no base
1275 register. */
1276 to_reloc_32 = !is_pic || baseless;
1277
1278 eh = elf_x86_hash_entry (h);
1279
1280 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1281 reloc. */
1282 if (h == NULL)
1283 {
1284 if (opcode == 0x0ff)
1285 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1286 goto convert_branch;
1287 else
1288 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1289 "test %reg1, foo@GOT(%reg2)" and
1290 "binop foo@GOT[(%reg1)], %reg2". */
1291 goto convert_load;
1292 }
1293
1294 /* Undefined weak symbol is only bound locally in executable
1295 and its reference is resolved as 0. */
1296 if (h->root.type == bfd_link_hash_undefweak
1297 && !eh->linker_def
1298 && local_ref)
1299 {
1300 if (opcode == 0xff)
1301 {
1302 /* No direct branch to 0 for PIC. */
1303 if (is_pic)
1304 return true;
1305 else
1306 goto convert_branch;
1307 }
1308 else
1309 {
1310 /* We can convert load of address 0 to R_386_32. */
1311 to_reloc_32 = true;
1312 goto convert_load;
1313 }
1314 }
1315
1316 if (opcode == 0xff)
1317 {
1318 /* We have "call/jmp *foo@GOT[(%reg)]". */
1319 if ((h->root.type == bfd_link_hash_defined
1320 || h->root.type == bfd_link_hash_defweak)
1321 && local_ref)
1322 {
1323 /* The function is locally defined. */
1324 convert_branch:
1325 /* Convert R_386_GOT32X to R_386_PC32. */
1326 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1327 {
1328 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1329 is a nop prefix. */
1330 modrm = 0xe8;
1331 /* To support TLS optimization, always use addr32 prefix
1332 for "call *___tls_get_addr@GOT(%reg)". */
1333 if (eh && eh->tls_get_addr)
1334 {
1335 nop = 0x67;
1336 nop_offset = irel->r_offset - 2;
1337 }
1338 else
1339 {
1340 nop = htab->params->call_nop_byte;
1341 if (htab->params->call_nop_as_suffix)
1342 {
1343 nop_offset = roff + 3;
1344 irel->r_offset -= 1;
1345 }
1346 else
1347 nop_offset = roff - 2;
1348 }
1349 }
1350 else
1351 {
1352 /* Convert to "jmp foo nop". */
1353 modrm = 0xe9;
1354 nop = NOP_OPCODE;
1355 nop_offset = roff + 3;
1356 irel->r_offset -= 1;
1357 }
1358
1359 bfd_put_8 (abfd, nop, contents + nop_offset);
1360 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1361 /* When converting to PC-relative relocation, we
1362 need to adjust addend by -4. */
1363 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1364 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1365 *r_type_p = R_386_PC32;
1366 *converted = true;
1367 }
1368 }
1369 else
1370 {
1371 /* We have "mov foo@GOT[(%re1g)], %reg2",
1372 "test %reg1, foo@GOT(%reg2)" and
1373 "binop foo@GOT[(%reg1)], %reg2".
1374
1375 Avoid optimizing _DYNAMIC since ld.so may use its
1376 link-time address. */
1377 if (h == htab->elf.hdynamic)
1378 return true;
1379
1380 /* def_regular is set by an assignment in a linker script in
1381 bfd_elf_record_link_assignment. start_stop is set on
1382 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1383 if (h->start_stop
1384 || eh->linker_def
1385 || ((h->def_regular
1386 || h->root.type == bfd_link_hash_defined
1387 || h->root.type == bfd_link_hash_defweak)
1388 && local_ref))
1389 {
1390 /* Skip __start_SECNAME/__stop_SECNAME when --gc-sections
1391 -z start-stop-gc are used. */
1392 if (elf_x86_start_stop_gc_p (link_info, h))
1393 return true;
1394
1395 convert_load:
1396 if (opcode == 0x8b)
1397 {
1398 if (abs_symbol && local_ref)
1399 to_reloc_32 = true;
1400
1401 if (to_reloc_32)
1402 {
1403 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1404 "mov $foo, %reg2" with R_386_32. */
1405 r_type = R_386_32;
1406 modrm = 0xc0 | (modrm & 0x38) >> 3;
1407 bfd_put_8 (abfd, modrm, contents + roff - 1);
1408 opcode = 0xc7;
1409 }
1410 else
1411 {
1412 /* Convert "mov foo@GOT(%reg1), %reg2" to
1413 "lea foo@GOTOFF(%reg1), %reg2". */
1414 r_type = R_386_GOTOFF;
1415 opcode = 0x8d;
1416 }
1417 }
1418 else
1419 {
1420 /* Only R_386_32 is supported. */
1421 if (!to_reloc_32)
1422 return true;
1423
1424 if (opcode == 0x85)
1425 {
1426 /* Convert "test %reg1, foo@GOT(%reg2)" to
1427 "test $foo, %reg1". */
1428 modrm = 0xc0 | (modrm & 0x38) >> 3;
1429 opcode = 0xf7;
1430 }
1431 else
1432 {
1433 /* Convert "binop foo@GOT(%reg1), %reg2" to
1434 "binop $foo, %reg2". */
1435 modrm = (0xc0
1436 | (modrm & 0x38) >> 3
1437 | (opcode & 0x3c));
1438 opcode = 0x81;
1439 }
1440 bfd_put_8 (abfd, modrm, contents + roff - 1);
1441 r_type = R_386_32;
1442 }
1443
1444 bfd_put_8 (abfd, opcode, contents + roff - 2);
1445 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1446 *r_type_p = r_type;
1447 *converted = true;
1448 }
1449 }
1450
1451 return true;
1452 }
1453
1454 /* Look through the relocs for a section during the first phase, and
1455 calculate needed space in the global offset table, procedure linkage
1456 table, and dynamic reloc sections. */
1457
1458 static bool
1459 elf_i386_check_relocs (bfd *abfd,
1460 struct bfd_link_info *info,
1461 asection *sec,
1462 const Elf_Internal_Rela *relocs)
1463 {
1464 struct elf_x86_link_hash_table *htab;
1465 Elf_Internal_Shdr *symtab_hdr;
1466 struct elf_link_hash_entry **sym_hashes;
1467 const Elf_Internal_Rela *rel;
1468 const Elf_Internal_Rela *rel_end;
1469 asection *sreloc;
1470 bfd_byte *contents;
1471 bool converted;
1472
1473 if (bfd_link_relocatable (info))
1474 return true;
1475
1476 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1477 if (htab == NULL)
1478 {
1479 sec->check_relocs_failed = 1;
1480 return false;
1481 }
1482
1483 BFD_ASSERT (is_x86_elf (abfd, htab));
1484
1485 /* Get the section contents. */
1486 if (elf_section_data (sec)->this_hdr.contents != NULL)
1487 contents = elf_section_data (sec)->this_hdr.contents;
1488 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1489 {
1490 sec->check_relocs_failed = 1;
1491 return false;
1492 }
1493
1494 symtab_hdr = &elf_symtab_hdr (abfd);
1495 sym_hashes = elf_sym_hashes (abfd);
1496
1497 converted = false;
1498
1499 sreloc = NULL;
1500
1501 rel_end = relocs + sec->reloc_count;
1502 for (rel = relocs; rel < rel_end; rel++)
1503 {
1504 unsigned int r_type;
1505 unsigned int r_symndx;
1506 struct elf_link_hash_entry *h;
1507 struct elf_x86_link_hash_entry *eh;
1508 Elf_Internal_Sym *isym;
1509 const char *name;
1510 bool size_reloc;
1511 bool no_dynreloc;
1512
1513 r_symndx = ELF32_R_SYM (rel->r_info);
1514 r_type = ELF32_R_TYPE (rel->r_info);
1515
1516 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1517 {
1518 /* xgettext:c-format */
1519 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1520 abfd, r_symndx);
1521 goto error_return;
1522 }
1523
1524 if (r_symndx < symtab_hdr->sh_info)
1525 {
1526 /* A local symbol. */
1527 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1528 abfd, r_symndx);
1529 if (isym == NULL)
1530 goto error_return;
1531
1532 /* Check relocation against local STT_GNU_IFUNC symbol. */
1533 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1534 {
1535 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, true);
1536 if (h == NULL)
1537 goto error_return;
1538
1539 /* Fake a STT_GNU_IFUNC symbol. */
1540 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1541 isym, NULL);
1542 h->type = STT_GNU_IFUNC;
1543 h->def_regular = 1;
1544 h->ref_regular = 1;
1545 h->forced_local = 1;
1546 h->root.type = bfd_link_hash_defined;
1547 }
1548 else
1549 h = NULL;
1550 }
1551 else
1552 {
1553 isym = NULL;
1554 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1555 while (h->root.type == bfd_link_hash_indirect
1556 || h->root.type == bfd_link_hash_warning)
1557 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1558 }
1559
1560 eh = (struct elf_x86_link_hash_entry *) h;
1561 if (h != NULL)
1562 {
1563 if (r_type == R_386_GOTOFF)
1564 eh->gotoff_ref = 1;
1565
1566 /* It is referenced by a non-shared object. */
1567 h->ref_regular = 1;
1568 }
1569
1570 if (r_type == R_386_GOT32X
1571 && (h == NULL || h->type != STT_GNU_IFUNC))
1572 {
1573 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1574 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1575 &r_type, irel, h,
1576 &converted, info))
1577 goto error_return;
1578 }
1579
1580 if (!_bfd_elf_x86_valid_reloc_p (sec, info, htab, rel, h, isym,
1581 symtab_hdr, &no_dynreloc))
1582 return false;
1583
1584 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1585 symtab_hdr, sym_hashes,
1586 &r_type, GOT_UNKNOWN,
1587 rel, rel_end, h, r_symndx, false))
1588 goto error_return;
1589
1590 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1591 if (h == htab->elf.hgot)
1592 htab->got_referenced = true;
1593
1594 switch (r_type)
1595 {
1596 case R_386_TLS_LDM:
1597 htab->tls_ld_or_ldm_got.refcount = 1;
1598 goto create_got;
1599
1600 case R_386_PLT32:
1601 /* This symbol requires a procedure linkage table entry. We
1602 actually build the entry in adjust_dynamic_symbol,
1603 because this might be a case of linking PIC code which is
1604 never referenced by a dynamic object, in which case we
1605 don't need to generate a procedure linkage table entry
1606 after all. */
1607
1608 /* If this is a local symbol, we resolve it directly without
1609 creating a procedure linkage table entry. */
1610 if (h == NULL)
1611 continue;
1612
1613 eh->zero_undefweak &= 0x2;
1614 h->needs_plt = 1;
1615 h->plt.refcount = 1;
1616 break;
1617
1618 case R_386_SIZE32:
1619 size_reloc = true;
1620 goto do_size;
1621
1622 case R_386_TLS_IE_32:
1623 case R_386_TLS_IE:
1624 case R_386_TLS_GOTIE:
1625 if (!bfd_link_executable (info))
1626 info->flags |= DF_STATIC_TLS;
1627 /* Fall through */
1628
1629 case R_386_GOT32:
1630 case R_386_GOT32X:
1631 case R_386_TLS_GD:
1632 case R_386_TLS_GOTDESC:
1633 case R_386_TLS_DESC_CALL:
1634 /* This symbol requires a global offset table entry. */
1635 {
1636 int tls_type, old_tls_type;
1637
1638 switch (r_type)
1639 {
1640 default:
1641 case R_386_GOT32:
1642 case R_386_GOT32X:
1643 tls_type = GOT_NORMAL;
1644 break;
1645 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1646 case R_386_TLS_GOTDESC:
1647 case R_386_TLS_DESC_CALL:
1648 tls_type = GOT_TLS_GDESC; break;
1649 case R_386_TLS_IE_32:
1650 if (ELF32_R_TYPE (rel->r_info) == r_type)
1651 tls_type = GOT_TLS_IE_NEG;
1652 else
1653 /* If this is a GD->IE transition, we may use either of
1654 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1655 tls_type = GOT_TLS_IE;
1656 break;
1657 case R_386_TLS_IE:
1658 case R_386_TLS_GOTIE:
1659 tls_type = GOT_TLS_IE_POS; break;
1660 }
1661
1662 if (h != NULL)
1663 {
1664 h->got.refcount = 1;
1665 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1666 }
1667 else
1668 {
1669 bfd_signed_vma *local_got_refcounts;
1670
1671 if (!elf_x86_allocate_local_got_info (abfd,
1672 symtab_hdr->sh_info))
1673 goto error_return;
1674
1675 /* This is a global offset table entry for a local symbol. */
1676 local_got_refcounts = elf_local_got_refcounts (abfd);
1677 local_got_refcounts[r_symndx] = 1;
1678 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1679 }
1680
1681 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1682 tls_type |= old_tls_type;
1683 /* If a TLS symbol is accessed using IE at least once,
1684 there is no point to use dynamic model for it. */
1685 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1686 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1687 || (tls_type & GOT_TLS_IE) == 0))
1688 {
1689 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1690 tls_type = old_tls_type;
1691 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1692 && GOT_TLS_GD_ANY_P (tls_type))
1693 tls_type |= old_tls_type;
1694 else
1695 {
1696 if (h)
1697 name = h->root.root.string;
1698 else
1699 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1700 NULL);
1701 _bfd_error_handler
1702 /* xgettext:c-format */
1703 (_("%pB: `%s' accessed both as normal and "
1704 "thread local symbol"),
1705 abfd, name);
1706 bfd_set_error (bfd_error_bad_value);
1707 goto error_return;
1708 }
1709 }
1710
1711 if (old_tls_type != tls_type)
1712 {
1713 if (h != NULL)
1714 elf_x86_hash_entry (h)->tls_type = tls_type;
1715 else
1716 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1717 }
1718 }
1719 /* Fall through */
1720
1721 case R_386_GOTOFF:
1722 case R_386_GOTPC:
1723 create_got:
1724 if (r_type != R_386_TLS_IE)
1725 {
1726 if (eh != NULL)
1727 {
1728 eh->zero_undefweak &= 0x2;
1729
1730 /* Need GOT to resolve undefined weak symbol to 0. */
1731 if (r_type == R_386_GOTOFF
1732 && h->root.type == bfd_link_hash_undefweak
1733 && bfd_link_executable (info))
1734 htab->got_referenced = true;
1735 }
1736 break;
1737 }
1738 /* Fall through */
1739
1740 case R_386_TLS_LE_32:
1741 case R_386_TLS_LE:
1742 if (eh != NULL)
1743 eh->zero_undefweak &= 0x2;
1744 if (bfd_link_executable (info))
1745 break;
1746 info->flags |= DF_STATIC_TLS;
1747 goto do_relocation;
1748
1749 case R_386_32:
1750 case R_386_PC32:
1751 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1752 eh->zero_undefweak |= 0x2;
1753 do_relocation:
1754 /* We are called after all symbols have been resolved. Only
1755 relocation against STT_GNU_IFUNC symbol must go through
1756 PLT. */
1757 if (h != NULL
1758 && (bfd_link_executable (info)
1759 || h->type == STT_GNU_IFUNC))
1760 {
1761 bool func_pointer_ref = false;
1762
1763 if (r_type == R_386_PC32)
1764 {
1765 /* Since something like ".long foo - ." may be used
1766 as pointer, make sure that PLT is used if foo is
1767 a function defined in a shared library. */
1768 if ((sec->flags & SEC_CODE) == 0)
1769 h->pointer_equality_needed = 1;
1770 else if (h->type == STT_GNU_IFUNC
1771 && bfd_link_pic (info))
1772 {
1773 _bfd_error_handler
1774 /* xgettext:c-format */
1775 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1776 abfd, h->root.root.string);
1777 bfd_set_error (bfd_error_bad_value);
1778 goto error_return;
1779 }
1780 }
1781 else
1782 {
1783 h->pointer_equality_needed = 1;
1784 /* R_386_32 can be resolved at run-time. */
1785 if (r_type == R_386_32
1786 && (sec->flags & SEC_READONLY) == 0)
1787 func_pointer_ref = true;
1788 }
1789
1790 if (!func_pointer_ref)
1791 {
1792 /* If this reloc is in a read-only section, we might
1793 need a copy reloc. We can't check reliably at this
1794 stage whether the section is read-only, as input
1795 sections have not yet been mapped to output sections.
1796 Tentatively set the flag for now, and correct in
1797 adjust_dynamic_symbol. */
1798 h->non_got_ref = 1;
1799
1800 if (!elf_has_indirect_extern_access (sec->owner))
1801 eh->non_got_ref_without_indirect_extern_access = 1;
1802
1803 /* We may need a .plt entry if the symbol is a function
1804 defined in a shared lib or is a function referenced
1805 from the code or read-only section. */
1806 if (!h->def_regular
1807 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1808 h->plt.refcount = 1;
1809 }
1810 }
1811
1812 size_reloc = false;
1813 do_size:
1814 if (!no_dynreloc
1815 && NEED_DYNAMIC_RELOCATION_P (false, info, false, h, sec,
1816 r_type, R_386_32))
1817 {
1818 struct elf_dyn_relocs *p;
1819 struct elf_dyn_relocs **head;
1820
1821 /* We must copy these reloc types into the output file.
1822 Create a reloc section in dynobj and make room for
1823 this reloc. */
1824 if (sreloc == NULL)
1825 {
1826 sreloc = _bfd_elf_make_dynamic_reloc_section
1827 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ false);
1828
1829 if (sreloc == NULL)
1830 goto error_return;
1831 }
1832
1833 /* If this is a global symbol, we count the number of
1834 relocations we need for this symbol. */
1835 if (h != NULL)
1836 {
1837 head = &h->dyn_relocs;
1838 }
1839 else
1840 {
1841 /* Track dynamic relocs needed for local syms too.
1842 We really need local syms available to do this
1843 easily. Oh well. */
1844 void **vpp;
1845 asection *s;
1846
1847 isym = bfd_sym_from_r_symndx (&htab->elf.sym_cache,
1848 abfd, r_symndx);
1849 if (isym == NULL)
1850 goto error_return;
1851
1852 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1853 if (s == NULL)
1854 s = sec;
1855
1856 vpp = &elf_section_data (s)->local_dynrel;
1857 head = (struct elf_dyn_relocs **)vpp;
1858 }
1859
1860 p = *head;
1861 if (p == NULL || p->sec != sec)
1862 {
1863 size_t amt = sizeof *p;
1864 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1865 amt);
1866 if (p == NULL)
1867 goto error_return;
1868 p->next = *head;
1869 *head = p;
1870 p->sec = sec;
1871 p->count = 0;
1872 p->pc_count = 0;
1873 }
1874
1875 p->count += 1;
1876 /* Count size relocation as PC-relative relocation. */
1877 if (r_type == R_386_PC32 || size_reloc)
1878 p->pc_count += 1;
1879 }
1880 break;
1881
1882 /* This relocation describes the C++ object vtable hierarchy.
1883 Reconstruct it for later use during GC. */
1884 case R_386_GNU_VTINHERIT:
1885 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1886 goto error_return;
1887 break;
1888
1889 /* This relocation describes which C++ vtable entries are actually
1890 used. Record for later use during GC. */
1891 case R_386_GNU_VTENTRY:
1892 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1893 goto error_return;
1894 break;
1895
1896 default:
1897 break;
1898 }
1899 }
1900
1901 if (elf_section_data (sec)->this_hdr.contents != contents)
1902 {
1903 if (!converted && !_bfd_link_keep_memory (info))
1904 free (contents);
1905 else
1906 {
1907 /* Cache the section contents for elf_link_input_bfd if any
1908 load is converted or --no-keep-memory isn't used. */
1909 elf_section_data (sec)->this_hdr.contents = contents;
1910 info->cache_size += sec->size;
1911 }
1912 }
1913
1914 /* Cache relocations if any load is converted. */
1915 if (elf_section_data (sec)->relocs != relocs && converted)
1916 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1917
1918 return true;
1919
1920 error_return:
1921 if (elf_section_data (sec)->this_hdr.contents != contents)
1922 free (contents);
1923 sec->check_relocs_failed = 1;
1924 return false;
1925 }
1926
1927 /* Set the correct type for an x86 ELF section. We do this by the
1928 section name, which is a hack, but ought to work. */
1929
1930 static bool
1931 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1932 Elf_Internal_Shdr *hdr,
1933 asection *sec)
1934 {
1935 const char *name;
1936
1937 name = bfd_section_name (sec);
1938
1939 /* This is an ugly, but unfortunately necessary hack that is
1940 needed when producing EFI binaries on x86. It tells
1941 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1942 containing ELF relocation info. We need this hack in order to
1943 be able to generate ELF binaries that can be translated into
1944 EFI applications (which are essentially COFF objects). Those
1945 files contain a COFF ".reloc" section inside an ELFNN object,
1946 which would normally cause BFD to segfault because it would
1947 attempt to interpret this section as containing relocation
1948 entries for section "oc". With this hack enabled, ".reloc"
1949 will be treated as a normal data section, which will avoid the
1950 segfault. However, you won't be able to create an ELFNN binary
1951 with a section named "oc" that needs relocations, but that's
1952 the kind of ugly side-effects you get when detecting section
1953 types based on their names... In practice, this limitation is
1954 unlikely to bite. */
1955 if (strcmp (name, ".reloc") == 0)
1956 hdr->sh_type = SHT_PROGBITS;
1957
1958 return true;
1959 }
1960
1961 /* Return the relocation value for @tpoff relocation
1962 if STT_TLS virtual address is ADDRESS. */
1963
1964 static bfd_vma
1965 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1966 {
1967 struct elf_link_hash_table *htab = elf_hash_table (info);
1968 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1969 bfd_vma static_tls_size;
1970
1971 /* If tls_sec is NULL, we should have signalled an error already. */
1972 if (htab->tls_sec == NULL)
1973 return 0;
1974
1975 /* Consider special static TLS alignment requirements. */
1976 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1977 return static_tls_size + htab->tls_sec->vma - address;
1978 }
1979
1980 /* Relocate an i386 ELF section. */
1981
1982 static int
1983 elf_i386_relocate_section (bfd *output_bfd,
1984 struct bfd_link_info *info,
1985 bfd *input_bfd,
1986 asection *input_section,
1987 bfd_byte *contents,
1988 Elf_Internal_Rela *relocs,
1989 Elf_Internal_Sym *local_syms,
1990 asection **local_sections)
1991 {
1992 struct elf_x86_link_hash_table *htab;
1993 Elf_Internal_Shdr *symtab_hdr;
1994 struct elf_link_hash_entry **sym_hashes;
1995 bfd_vma *local_got_offsets;
1996 bfd_vma *local_tlsdesc_gotents;
1997 Elf_Internal_Rela *rel;
1998 Elf_Internal_Rela *wrel;
1999 Elf_Internal_Rela *relend;
2000 bool is_vxworks_tls;
2001 unsigned plt_entry_size;
2002
2003 /* Skip if check_relocs failed. */
2004 if (input_section->check_relocs_failed)
2005 return false;
2006
2007 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2008 if (htab == NULL)
2009 return false;
2010
2011 if (!is_x86_elf (input_bfd, htab))
2012 {
2013 bfd_set_error (bfd_error_wrong_format);
2014 return false;
2015 }
2016
2017 symtab_hdr = &elf_symtab_hdr (input_bfd);
2018 sym_hashes = elf_sym_hashes (input_bfd);
2019 local_got_offsets = elf_local_got_offsets (input_bfd);
2020 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2021 /* We have to handle relocations in vxworks .tls_vars sections
2022 specially, because the dynamic loader is 'weird'. */
2023 is_vxworks_tls = (htab->elf.target_os == is_vxworks
2024 && bfd_link_pic (info)
2025 && !strcmp (input_section->output_section->name,
2026 ".tls_vars"));
2027
2028 _bfd_x86_elf_set_tls_module_base (info);
2029
2030 plt_entry_size = htab->plt.plt_entry_size;
2031
2032 rel = wrel = relocs;
2033 relend = relocs + input_section->reloc_count;
2034 for (; rel < relend; wrel++, rel++)
2035 {
2036 unsigned int r_type, r_type_tls;
2037 reloc_howto_type *howto;
2038 unsigned long r_symndx;
2039 struct elf_link_hash_entry *h;
2040 struct elf_x86_link_hash_entry *eh;
2041 Elf_Internal_Sym *sym;
2042 asection *sec;
2043 bfd_vma off, offplt, plt_offset;
2044 bfd_vma relocation;
2045 bool unresolved_reloc;
2046 bfd_reloc_status_type r;
2047 unsigned int indx;
2048 int tls_type;
2049 bfd_vma st_size;
2050 asection *resolved_plt;
2051 bool resolved_to_zero;
2052 bool relative_reloc;
2053
2054 r_type = ELF32_R_TYPE (rel->r_info);
2055 if (r_type == R_386_GNU_VTINHERIT
2056 || r_type == R_386_GNU_VTENTRY)
2057 {
2058 if (wrel != rel)
2059 *wrel = *rel;
2060 continue;
2061 }
2062
2063 howto = elf_i386_rtype_to_howto (r_type);
2064 if (howto == NULL)
2065 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2066
2067 r_symndx = ELF32_R_SYM (rel->r_info);
2068 h = NULL;
2069 sym = NULL;
2070 sec = NULL;
2071 unresolved_reloc = false;
2072 if (r_symndx < symtab_hdr->sh_info)
2073 {
2074 sym = local_syms + r_symndx;
2075 sec = local_sections[r_symndx];
2076 relocation = (sec->output_section->vma
2077 + sec->output_offset
2078 + sym->st_value);
2079 st_size = sym->st_size;
2080
2081 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2082 && ((sec->flags & SEC_MERGE) != 0
2083 || (bfd_link_relocatable (info)
2084 && sec->output_offset != 0)))
2085 {
2086 bfd_vma addend;
2087 bfd_byte *where = contents + rel->r_offset;
2088
2089 switch (howto->size)
2090 {
2091 case 0:
2092 addend = bfd_get_8 (input_bfd, where);
2093 if (howto->pc_relative)
2094 {
2095 addend = (addend ^ 0x80) - 0x80;
2096 addend += 1;
2097 }
2098 break;
2099 case 1:
2100 addend = bfd_get_16 (input_bfd, where);
2101 if (howto->pc_relative)
2102 {
2103 addend = (addend ^ 0x8000) - 0x8000;
2104 addend += 2;
2105 }
2106 break;
2107 case 2:
2108 addend = bfd_get_32 (input_bfd, where);
2109 if (howto->pc_relative)
2110 {
2111 addend = (addend ^ 0x80000000) - 0x80000000;
2112 addend += 4;
2113 }
2114 break;
2115 default:
2116 abort ();
2117 }
2118
2119 if (bfd_link_relocatable (info))
2120 addend += sec->output_offset;
2121 else
2122 {
2123 asection *msec = sec;
2124 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2125 addend);
2126 addend -= relocation;
2127 addend += msec->output_section->vma + msec->output_offset;
2128 }
2129
2130 switch (howto->size)
2131 {
2132 case 0:
2133 /* FIXME: overflow checks. */
2134 if (howto->pc_relative)
2135 addend -= 1;
2136 bfd_put_8 (input_bfd, addend, where);
2137 break;
2138 case 1:
2139 if (howto->pc_relative)
2140 addend -= 2;
2141 bfd_put_16 (input_bfd, addend, where);
2142 break;
2143 case 2:
2144 if (howto->pc_relative)
2145 addend -= 4;
2146 bfd_put_32 (input_bfd, addend, where);
2147 break;
2148 }
2149 }
2150 else if (!bfd_link_relocatable (info)
2151 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2152 {
2153 /* Relocate against local STT_GNU_IFUNC symbol. */
2154 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2155 false);
2156 if (h == NULL)
2157 abort ();
2158
2159 /* Set STT_GNU_IFUNC symbol value. */
2160 h->root.u.def.value = sym->st_value;
2161 h->root.u.def.section = sec;
2162 }
2163 }
2164 else
2165 {
2166 bool warned ATTRIBUTE_UNUSED;
2167 bool ignored ATTRIBUTE_UNUSED;
2168
2169 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2170 r_symndx, symtab_hdr, sym_hashes,
2171 h, sec, relocation,
2172 unresolved_reloc, warned, ignored);
2173 st_size = h->size;
2174 }
2175
2176 if (sec != NULL && discarded_section (sec))
2177 {
2178 _bfd_clear_contents (howto, input_bfd, input_section,
2179 contents, rel->r_offset);
2180 wrel->r_offset = rel->r_offset;
2181 wrel->r_info = 0;
2182 wrel->r_addend = 0;
2183
2184 /* For ld -r, remove relocations in debug sections against
2185 sections defined in discarded sections. Not done for
2186 eh_frame editing code expects to be present. */
2187 if (bfd_link_relocatable (info)
2188 && (input_section->flags & SEC_DEBUGGING))
2189 wrel--;
2190
2191 continue;
2192 }
2193
2194 if (bfd_link_relocatable (info))
2195 {
2196 if (wrel != rel)
2197 *wrel = *rel;
2198 continue;
2199 }
2200
2201 eh = (struct elf_x86_link_hash_entry *) h;
2202
2203 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2204 it here if it is defined in a non-shared object. */
2205 if (h != NULL
2206 && h->type == STT_GNU_IFUNC
2207 && h->def_regular)
2208 {
2209 asection *gotplt, *base_got;
2210 bfd_vma plt_index;
2211 const char *name;
2212
2213 if ((input_section->flags & SEC_ALLOC) == 0)
2214 {
2215 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2216 STT_GNU_IFUNC symbol as STT_FUNC. */
2217 if (elf_section_type (input_section) == SHT_NOTE)
2218 goto skip_ifunc;
2219 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2220 sections because such sections are not SEC_ALLOC and
2221 thus ld.so will not process them. */
2222 if ((input_section->flags & SEC_DEBUGGING) != 0)
2223 continue;
2224 abort ();
2225 }
2226
2227 /* STT_GNU_IFUNC symbol must go through PLT. */
2228 if (htab->elf.splt != NULL)
2229 {
2230 if (htab->plt_second != NULL)
2231 {
2232 resolved_plt = htab->plt_second;
2233 plt_offset = eh->plt_second.offset;
2234 }
2235 else
2236 {
2237 resolved_plt = htab->elf.splt;
2238 plt_offset = h->plt.offset;
2239 }
2240 gotplt = htab->elf.sgotplt;
2241 }
2242 else
2243 {
2244 resolved_plt = htab->elf.iplt;
2245 plt_offset = h->plt.offset;
2246 gotplt = htab->elf.igotplt;
2247 }
2248
2249 switch (r_type)
2250 {
2251 default:
2252 break;
2253
2254 case R_386_GOT32:
2255 case R_386_GOT32X:
2256 base_got = htab->elf.sgot;
2257 off = h->got.offset;
2258
2259 if (base_got == NULL)
2260 abort ();
2261
2262 if (off == (bfd_vma) -1)
2263 {
2264 /* We can't use h->got.offset here to save state, or
2265 even just remember the offset, as finish_dynamic_symbol
2266 would use that as offset into .got. */
2267
2268 if (h->plt.offset == (bfd_vma) -1)
2269 abort ();
2270
2271 if (htab->elf.splt != NULL)
2272 {
2273 plt_index = (h->plt.offset / plt_entry_size
2274 - htab->plt.has_plt0);
2275 off = (plt_index + 3) * 4;
2276 base_got = htab->elf.sgotplt;
2277 }
2278 else
2279 {
2280 plt_index = h->plt.offset / plt_entry_size;
2281 off = plt_index * 4;
2282 base_got = htab->elf.igotplt;
2283 }
2284
2285 if (h->dynindx == -1
2286 || h->forced_local
2287 || info->symbolic)
2288 {
2289 /* This references the local defitionion. We must
2290 initialize this entry in the global offset table.
2291 Since the offset must always be a multiple of 4,
2292 we use the least significant bit to record
2293 whether we have initialized it already.
2294
2295 When doing a dynamic link, we create a .rela.got
2296 relocation entry to initialize the value. This
2297 is done in the finish_dynamic_symbol routine. */
2298 if ((off & 1) != 0)
2299 off &= ~1;
2300 else
2301 {
2302 bfd_put_32 (output_bfd, relocation,
2303 base_got->contents + off);
2304 h->got.offset |= 1;
2305 }
2306 }
2307
2308 relocation = off;
2309 }
2310 else
2311 relocation = (base_got->output_section->vma
2312 + base_got->output_offset + off
2313 - gotplt->output_section->vma
2314 - gotplt->output_offset);
2315
2316 if (rel->r_offset > 1
2317 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2318 && *(contents + rel->r_offset - 2) != 0x8d)
2319 {
2320 if (bfd_link_pic (info))
2321 goto disallow_got32;
2322
2323 /* Add the GOT base if there is no base register. */
2324 relocation += (gotplt->output_section->vma
2325 + gotplt->output_offset);
2326 }
2327 else if (htab->elf.splt == NULL)
2328 {
2329 /* Adjust for static executables. */
2330 relocation += gotplt->output_offset;
2331 }
2332
2333 goto do_relocation;
2334 }
2335
2336 if (h->plt.offset == (bfd_vma) -1)
2337 {
2338 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2339 if (r_type == R_386_32
2340 && (input_section->flags & SEC_CODE) == 0)
2341 goto do_ifunc_pointer;
2342 goto bad_ifunc_reloc;
2343 }
2344
2345 relocation = (resolved_plt->output_section->vma
2346 + resolved_plt->output_offset + plt_offset);
2347
2348 switch (r_type)
2349 {
2350 default:
2351 bad_ifunc_reloc:
2352 if (h->root.root.string)
2353 name = h->root.root.string;
2354 else
2355 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2356 NULL);
2357 _bfd_error_handler
2358 /* xgettext:c-format */
2359 (_("%pB: relocation %s against STT_GNU_IFUNC "
2360 "symbol `%s' isn't supported"), input_bfd,
2361 howto->name, name);
2362 bfd_set_error (bfd_error_bad_value);
2363 return false;
2364
2365 case R_386_32:
2366 /* Generate dynamic relcoation only when there is a
2367 non-GOT reference in a shared object. */
2368 if ((bfd_link_pic (info) && h->non_got_ref)
2369 || h->plt.offset == (bfd_vma) -1)
2370 {
2371 Elf_Internal_Rela outrel;
2372 asection *sreloc;
2373 bfd_vma offset;
2374
2375 do_ifunc_pointer:
2376 /* Need a dynamic relocation to get the real function
2377 adddress. */
2378 offset = _bfd_elf_section_offset (output_bfd,
2379 info,
2380 input_section,
2381 rel->r_offset);
2382 if (offset == (bfd_vma) -1
2383 || offset == (bfd_vma) -2)
2384 abort ();
2385
2386 outrel.r_offset = (input_section->output_section->vma
2387 + input_section->output_offset
2388 + offset);
2389
2390 if (POINTER_LOCAL_IFUNC_P (info, h))
2391 {
2392 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2393 h->root.root.string,
2394 h->root.u.def.section->owner);
2395
2396 /* This symbol is resolved locally. */
2397 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2398
2399 if (htab->params->report_relative_reloc)
2400 _bfd_x86_elf_link_report_relative_reloc
2401 (info, input_section, h, sym,
2402 "R_386_IRELATIVE", &outrel);
2403
2404 bfd_put_32 (output_bfd,
2405 (h->root.u.def.value
2406 + h->root.u.def.section->output_section->vma
2407 + h->root.u.def.section->output_offset),
2408 contents + offset);
2409 }
2410 else
2411 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2412
2413 /* Dynamic relocations are stored in
2414 1. .rel.ifunc section in PIC object.
2415 2. .rel.got section in dynamic executable.
2416 3. .rel.iplt section in static executable. */
2417 if (bfd_link_pic (info))
2418 sreloc = htab->elf.irelifunc;
2419 else if (htab->elf.splt != NULL)
2420 sreloc = htab->elf.srelgot;
2421 else
2422 sreloc = htab->elf.irelplt;
2423 elf_append_rel (output_bfd, sreloc, &outrel);
2424
2425 /* If this reloc is against an external symbol, we
2426 do not want to fiddle with the addend. Otherwise,
2427 we need to include the symbol value so that it
2428 becomes an addend for the dynamic reloc. For an
2429 internal symbol, we have updated addend. */
2430 continue;
2431 }
2432 /* FALLTHROUGH */
2433 case R_386_PC32:
2434 case R_386_PLT32:
2435 goto do_relocation;
2436
2437 case R_386_GOTOFF:
2438 relocation -= (gotplt->output_section->vma
2439 + gotplt->output_offset);
2440 goto do_relocation;
2441 }
2442 }
2443
2444 skip_ifunc:
2445 resolved_to_zero = (eh != NULL
2446 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2447
2448 switch (r_type)
2449 {
2450 case R_386_GOT32X:
2451 case R_386_GOT32:
2452 /* Relocation is to the entry for this symbol in the global
2453 offset table. */
2454 if (htab->elf.sgot == NULL)
2455 abort ();
2456
2457 relative_reloc = false;
2458 if (h != NULL)
2459 {
2460 off = h->got.offset;
2461 if (RESOLVED_LOCALLY_P (info, h, htab))
2462 {
2463 /* We must initialize this entry in the global offset
2464 table. Since the offset must always be a multiple
2465 of 4, we use the least significant bit to record
2466 whether we have initialized it already.
2467
2468 When doing a dynamic link, we create a .rel.got
2469 relocation entry to initialize the value. This
2470 is done in the finish_dynamic_symbol routine. */
2471 if ((off & 1) != 0)
2472 off &= ~1;
2473 else
2474 {
2475 bfd_put_32 (output_bfd, relocation,
2476 htab->elf.sgot->contents + off);
2477 h->got.offset |= 1;
2478
2479 if (GENERATE_RELATIVE_RELOC_P (info, h))
2480 {
2481 /* PR ld/21402: If this symbol isn't dynamic
2482 in PIC, generate R_386_RELATIVE here. */
2483 eh->no_finish_dynamic_symbol = 1;
2484 relative_reloc = true;
2485 }
2486 }
2487 }
2488 else
2489 unresolved_reloc = false;
2490 }
2491 else
2492 {
2493 if (local_got_offsets == NULL)
2494 abort ();
2495
2496 off = local_got_offsets[r_symndx];
2497
2498 /* The offset must always be a multiple of 4. We use
2499 the least significant bit to record whether we have
2500 already generated the necessary reloc. */
2501 if ((off & 1) != 0)
2502 off &= ~1;
2503 else
2504 {
2505 bfd_put_32 (output_bfd, relocation,
2506 htab->elf.sgot->contents + off);
2507 local_got_offsets[r_symndx] |= 1;
2508
2509 if (bfd_link_pic (info))
2510 relative_reloc = true;
2511 }
2512 }
2513
2514 if (relative_reloc)
2515 {
2516 asection *s;
2517 Elf_Internal_Rela outrel;
2518
2519 s = htab->elf.srelgot;
2520 if (s == NULL)
2521 abort ();
2522
2523 outrel.r_offset = (htab->elf.sgot->output_section->vma
2524 + htab->elf.sgot->output_offset
2525 + off);
2526 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2527
2528 if (htab->params->report_relative_reloc)
2529 _bfd_x86_elf_link_report_relative_reloc
2530 (info, input_section, h, sym, "R_386_RELATIVE",
2531 &outrel);
2532
2533 elf_append_rel (output_bfd, s, &outrel);
2534 }
2535
2536 if (off >= (bfd_vma) -2)
2537 abort ();
2538
2539 relocation = (htab->elf.sgot->output_section->vma
2540 + htab->elf.sgot->output_offset + off);
2541 if (rel->r_offset > 1
2542 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2543 && *(contents + rel->r_offset - 2) != 0x8d)
2544 {
2545 if (bfd_link_pic (info))
2546 {
2547 /* For PIC, disallow R_386_GOT32 without a base
2548 register, except for "lea foo@GOT, %reg", since
2549 we don't know what the GOT base is. */
2550 const char *name;
2551
2552 disallow_got32:
2553 if (h == NULL || h->root.root.string == NULL)
2554 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2555 NULL);
2556 else
2557 name = h->root.root.string;
2558
2559 _bfd_error_handler
2560 /* xgettext:c-format */
2561 (_("%pB: direct GOT relocation %s against `%s'"
2562 " without base register can not be used"
2563 " when making a shared object"),
2564 input_bfd, howto->name, name);
2565 bfd_set_error (bfd_error_bad_value);
2566 return false;
2567 }
2568 }
2569 else
2570 {
2571 /* Subtract the .got.plt section address only with a base
2572 register. */
2573 relocation -= (htab->elf.sgotplt->output_section->vma
2574 + htab->elf.sgotplt->output_offset);
2575 }
2576
2577 break;
2578
2579 case R_386_GOTOFF:
2580 /* Relocation is relative to the start of the global offset
2581 table. */
2582
2583 /* Check to make sure it isn't a protected function or data
2584 symbol for shared library since it may not be local when
2585 used as function address or with copy relocation. We also
2586 need to make sure that a symbol is referenced locally. */
2587 if (!bfd_link_executable (info) && h)
2588 {
2589 if (!h->def_regular)
2590 {
2591 const char *v;
2592
2593 switch (ELF_ST_VISIBILITY (h->other))
2594 {
2595 case STV_HIDDEN:
2596 v = _("hidden symbol");
2597 break;
2598 case STV_INTERNAL:
2599 v = _("internal symbol");
2600 break;
2601 case STV_PROTECTED:
2602 v = _("protected symbol");
2603 break;
2604 default:
2605 v = _("symbol");
2606 break;
2607 }
2608
2609 _bfd_error_handler
2610 /* xgettext:c-format */
2611 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2612 " `%s' can not be used when making a shared object"),
2613 input_bfd, v, h->root.root.string);
2614 bfd_set_error (bfd_error_bad_value);
2615 return false;
2616 }
2617 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2618 && (h->type == STT_FUNC
2619 || h->type == STT_OBJECT)
2620 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2621 {
2622 _bfd_error_handler
2623 /* xgettext:c-format */
2624 (_("%pB: relocation R_386_GOTOFF against protected %s"
2625 " `%s' can not be used when making a shared object"),
2626 input_bfd,
2627 h->type == STT_FUNC ? "function" : "data",
2628 h->root.root.string);
2629 bfd_set_error (bfd_error_bad_value);
2630 return false;
2631 }
2632 }
2633
2634 /* Note that sgot is not involved in this
2635 calculation. We always want the start of .got.plt. If we
2636 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2637 permitted by the ABI, we might have to change this
2638 calculation. */
2639 relocation -= htab->elf.sgotplt->output_section->vma
2640 + htab->elf.sgotplt->output_offset;
2641 break;
2642
2643 case R_386_GOTPC:
2644 /* Use global offset table as symbol value. */
2645 relocation = htab->elf.sgotplt->output_section->vma
2646 + htab->elf.sgotplt->output_offset;
2647 unresolved_reloc = false;
2648 break;
2649
2650 case R_386_PLT32:
2651 /* Relocation is to the entry for this symbol in the
2652 procedure linkage table. */
2653
2654 /* Resolve a PLT32 reloc against a local symbol directly,
2655 without using the procedure linkage table. */
2656 if (h == NULL)
2657 break;
2658
2659 if ((h->plt.offset == (bfd_vma) -1
2660 && eh->plt_got.offset == (bfd_vma) -1)
2661 || htab->elf.splt == NULL)
2662 {
2663 /* We didn't make a PLT entry for this symbol. This
2664 happens when statically linking PIC code, or when
2665 using -Bsymbolic. */
2666 break;
2667 }
2668
2669 if (h->plt.offset != (bfd_vma) -1)
2670 {
2671 if (htab->plt_second != NULL)
2672 {
2673 resolved_plt = htab->plt_second;
2674 plt_offset = eh->plt_second.offset;
2675 }
2676 else
2677 {
2678 resolved_plt = htab->elf.splt;
2679 plt_offset = h->plt.offset;
2680 }
2681 }
2682 else
2683 {
2684 resolved_plt = htab->plt_got;
2685 plt_offset = eh->plt_got.offset;
2686 }
2687
2688 relocation = (resolved_plt->output_section->vma
2689 + resolved_plt->output_offset
2690 + plt_offset);
2691 unresolved_reloc = false;
2692 break;
2693
2694 case R_386_SIZE32:
2695 /* Set to symbol size. */
2696 relocation = st_size;
2697 /* Fall through. */
2698
2699 case R_386_32:
2700 case R_386_PC32:
2701 if ((input_section->flags & SEC_ALLOC) == 0
2702 || is_vxworks_tls)
2703 break;
2704
2705 if (GENERATE_DYNAMIC_RELOCATION_P (false, info, eh, r_type,
2706 sec, false,
2707 resolved_to_zero,
2708 (r_type == R_386_PC32)))
2709 {
2710 Elf_Internal_Rela outrel;
2711 bool skip, relocate;
2712 asection *sreloc;
2713
2714 /* When generating a shared object, these relocations
2715 are copied into the output file to be resolved at run
2716 time. */
2717
2718 skip = false;
2719 relocate = false;
2720
2721 outrel.r_offset =
2722 _bfd_elf_section_offset (output_bfd, info, input_section,
2723 rel->r_offset);
2724 if (outrel.r_offset == (bfd_vma) -1)
2725 skip = true;
2726 else if (outrel.r_offset == (bfd_vma) -2)
2727 skip = true, relocate = true;
2728 outrel.r_offset += (input_section->output_section->vma
2729 + input_section->output_offset);
2730
2731 if (skip)
2732 memset (&outrel, 0, sizeof outrel);
2733 else if (COPY_INPUT_RELOC_P (false, info, h, r_type))
2734 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2735 else
2736 {
2737 /* This symbol is local, or marked to become local. */
2738 relocate = true;
2739 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2740
2741 if (htab->params->report_relative_reloc)
2742 _bfd_x86_elf_link_report_relative_reloc
2743 (info, input_section, h, sym, "R_386_RELATIVE",
2744 &outrel);
2745 }
2746
2747 sreloc = elf_section_data (input_section)->sreloc;
2748
2749 if (sreloc == NULL || sreloc->contents == NULL)
2750 {
2751 r = bfd_reloc_notsupported;
2752 goto check_relocation_error;
2753 }
2754
2755 elf_append_rel (output_bfd, sreloc, &outrel);
2756
2757 /* If this reloc is against an external symbol, we do
2758 not want to fiddle with the addend. Otherwise, we
2759 need to include the symbol value so that it becomes
2760 an addend for the dynamic reloc. */
2761 if (! relocate)
2762 continue;
2763 }
2764 break;
2765
2766 case R_386_TLS_IE:
2767 if (!bfd_link_executable (info))
2768 {
2769 Elf_Internal_Rela outrel;
2770 asection *sreloc;
2771
2772 outrel.r_offset = rel->r_offset
2773 + input_section->output_section->vma
2774 + input_section->output_offset;
2775 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2776
2777 if (htab->params->report_relative_reloc)
2778 _bfd_x86_elf_link_report_relative_reloc
2779 (info, input_section, h, sym, "R_386_RELATIVE",
2780 &outrel);
2781
2782 sreloc = elf_section_data (input_section)->sreloc;
2783 if (sreloc == NULL)
2784 abort ();
2785 elf_append_rel (output_bfd, sreloc, &outrel);
2786 }
2787 /* Fall through */
2788
2789 case R_386_TLS_GD:
2790 case R_386_TLS_GOTDESC:
2791 case R_386_TLS_DESC_CALL:
2792 case R_386_TLS_IE_32:
2793 case R_386_TLS_GOTIE:
2794 tls_type = GOT_UNKNOWN;
2795 if (h == NULL && local_got_offsets)
2796 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2797 else if (h != NULL)
2798 tls_type = elf_x86_hash_entry(h)->tls_type;
2799 if (tls_type == GOT_TLS_IE)
2800 tls_type = GOT_TLS_IE_NEG;
2801
2802 r_type_tls = r_type;
2803 if (! elf_i386_tls_transition (info, input_bfd,
2804 input_section, contents,
2805 symtab_hdr, sym_hashes,
2806 &r_type_tls, tls_type, rel,
2807 relend, h, r_symndx, true))
2808 return false;
2809
2810 if (r_type_tls == R_386_TLS_LE_32)
2811 {
2812 BFD_ASSERT (! unresolved_reloc);
2813 if (r_type == R_386_TLS_GD)
2814 {
2815 unsigned int type;
2816 bfd_vma roff;
2817
2818 /* GD->LE transition. */
2819 type = *(contents + rel->r_offset - 2);
2820 if (type == 0x04)
2821 {
2822 /* Change
2823 leal foo@tlsgd(,%ebx,1), %eax
2824 call ___tls_get_addr@PLT
2825 into:
2826 movl %gs:0, %eax
2827 subl $foo@tpoff, %eax
2828 (6 byte form of subl). */
2829 roff = rel->r_offset + 5;
2830 }
2831 else
2832 {
2833 /* Change
2834 leal foo@tlsgd(%ebx), %eax
2835 call ___tls_get_addr@PLT
2836 nop
2837 or
2838 leal foo@tlsgd(%reg), %eax
2839 call *___tls_get_addr@GOT(%reg)
2840 which may be converted to
2841 addr32 call ___tls_get_addr
2842 into:
2843 movl %gs:0, %eax; subl $foo@tpoff, %eax
2844 (6 byte form of subl). */
2845 roff = rel->r_offset + 6;
2846 }
2847 memcpy (contents + roff - 8,
2848 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2849 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2850 contents + roff);
2851 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2852 rel++;
2853 wrel++;
2854 continue;
2855 }
2856 else if (r_type == R_386_TLS_GOTDESC)
2857 {
2858 /* GDesc -> LE transition.
2859 It's originally something like:
2860 leal x@tlsdesc(%ebx), %eax
2861
2862 leal x@ntpoff, %eax
2863
2864 Registers other than %eax may be set up here. */
2865
2866 unsigned int val;
2867 bfd_vma roff;
2868
2869 roff = rel->r_offset;
2870 val = bfd_get_8 (input_bfd, contents + roff - 1);
2871
2872 /* Now modify the instruction as appropriate. */
2873 /* aoliva FIXME: remove the above and xor the byte
2874 below with 0x86. */
2875 bfd_put_8 (output_bfd, val ^ 0x86,
2876 contents + roff - 1);
2877 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2878 contents + roff);
2879 continue;
2880 }
2881 else if (r_type == R_386_TLS_DESC_CALL)
2882 {
2883 /* GDesc -> LE transition.
2884 It's originally:
2885 call *(%eax)
2886 Turn it into:
2887 xchg %ax,%ax */
2888
2889 bfd_vma roff;
2890
2891 roff = rel->r_offset;
2892 bfd_put_8 (output_bfd, 0x66, contents + roff);
2893 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2894 continue;
2895 }
2896 else if (r_type == R_386_TLS_IE)
2897 {
2898 unsigned int val;
2899
2900 /* IE->LE transition:
2901 Originally it can be one of:
2902 movl foo, %eax
2903 movl foo, %reg
2904 addl foo, %reg
2905 We change it into:
2906 movl $foo, %eax
2907 movl $foo, %reg
2908 addl $foo, %reg. */
2909 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2910 if (val == 0xa1)
2911 {
2912 /* movl foo, %eax. */
2913 bfd_put_8 (output_bfd, 0xb8,
2914 contents + rel->r_offset - 1);
2915 }
2916 else
2917 {
2918 unsigned int type;
2919
2920 type = bfd_get_8 (input_bfd,
2921 contents + rel->r_offset - 2);
2922 switch (type)
2923 {
2924 case 0x8b:
2925 /* movl */
2926 bfd_put_8 (output_bfd, 0xc7,
2927 contents + rel->r_offset - 2);
2928 bfd_put_8 (output_bfd,
2929 0xc0 | ((val >> 3) & 7),
2930 contents + rel->r_offset - 1);
2931 break;
2932 case 0x03:
2933 /* addl */
2934 bfd_put_8 (output_bfd, 0x81,
2935 contents + rel->r_offset - 2);
2936 bfd_put_8 (output_bfd,
2937 0xc0 | ((val >> 3) & 7),
2938 contents + rel->r_offset - 1);
2939 break;
2940 default:
2941 BFD_FAIL ();
2942 break;
2943 }
2944 }
2945 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2946 contents + rel->r_offset);
2947 continue;
2948 }
2949 else
2950 {
2951 unsigned int val, type;
2952
2953 /* {IE_32,GOTIE}->LE transition:
2954 Originally it can be one of:
2955 subl foo(%reg1), %reg2
2956 movl foo(%reg1), %reg2
2957 addl foo(%reg1), %reg2
2958 We change it into:
2959 subl $foo, %reg2
2960 movl $foo, %reg2 (6 byte form)
2961 addl $foo, %reg2. */
2962 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2963 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2964 if (type == 0x8b)
2965 {
2966 /* movl */
2967 bfd_put_8 (output_bfd, 0xc7,
2968 contents + rel->r_offset - 2);
2969 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2970 contents + rel->r_offset - 1);
2971 }
2972 else if (type == 0x2b)
2973 {
2974 /* subl */
2975 bfd_put_8 (output_bfd, 0x81,
2976 contents + rel->r_offset - 2);
2977 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2978 contents + rel->r_offset - 1);
2979 }
2980 else if (type == 0x03)
2981 {
2982 /* addl */
2983 bfd_put_8 (output_bfd, 0x81,
2984 contents + rel->r_offset - 2);
2985 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2986 contents + rel->r_offset - 1);
2987 }
2988 else
2989 BFD_FAIL ();
2990 if (r_type == R_386_TLS_GOTIE)
2991 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2992 contents + rel->r_offset);
2993 else
2994 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2995 contents + rel->r_offset);
2996 continue;
2997 }
2998 }
2999
3000 if (htab->elf.sgot == NULL)
3001 abort ();
3002
3003 if (h != NULL)
3004 {
3005 off = h->got.offset;
3006 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3007 }
3008 else
3009 {
3010 if (local_got_offsets == NULL)
3011 abort ();
3012
3013 off = local_got_offsets[r_symndx];
3014 offplt = local_tlsdesc_gotents[r_symndx];
3015 }
3016
3017 if ((off & 1) != 0)
3018 off &= ~1;
3019 else
3020 {
3021 Elf_Internal_Rela outrel;
3022 int dr_type;
3023 asection *sreloc;
3024
3025 if (htab->elf.srelgot == NULL)
3026 abort ();
3027
3028 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3029
3030 if (GOT_TLS_GDESC_P (tls_type))
3031 {
3032 bfd_byte *loc;
3033 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3034 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3035 <= htab->elf.sgotplt->size);
3036 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3037 + htab->elf.sgotplt->output_offset
3038 + offplt
3039 + htab->sgotplt_jump_table_size);
3040 sreloc = htab->elf.srelplt;
3041 loc = sreloc->contents;
3042 loc += (htab->next_tls_desc_index++
3043 * sizeof (Elf32_External_Rel));
3044 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3045 <= sreloc->contents + sreloc->size);
3046 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3047 if (indx == 0)
3048 {
3049 BFD_ASSERT (! unresolved_reloc);
3050 bfd_put_32 (output_bfd,
3051 relocation - _bfd_x86_elf_dtpoff_base (info),
3052 htab->elf.sgotplt->contents + offplt
3053 + htab->sgotplt_jump_table_size + 4);
3054 }
3055 else
3056 {
3057 bfd_put_32 (output_bfd, 0,
3058 htab->elf.sgotplt->contents + offplt
3059 + htab->sgotplt_jump_table_size + 4);
3060 }
3061 }
3062
3063 sreloc = htab->elf.srelgot;
3064
3065 outrel.r_offset = (htab->elf.sgot->output_section->vma
3066 + htab->elf.sgot->output_offset + off);
3067
3068 if (GOT_TLS_GD_P (tls_type))
3069 dr_type = R_386_TLS_DTPMOD32;
3070 else if (GOT_TLS_GDESC_P (tls_type))
3071 goto dr_done;
3072 else if (tls_type == GOT_TLS_IE_POS)
3073 dr_type = R_386_TLS_TPOFF;
3074 else
3075 dr_type = R_386_TLS_TPOFF32;
3076
3077 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3078 bfd_put_32 (output_bfd,
3079 relocation - _bfd_x86_elf_dtpoff_base (info),
3080 htab->elf.sgot->contents + off);
3081 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3082 bfd_put_32 (output_bfd,
3083 _bfd_x86_elf_dtpoff_base (info) - relocation,
3084 htab->elf.sgot->contents + off);
3085 else if (dr_type != R_386_TLS_DESC)
3086 bfd_put_32 (output_bfd, 0,
3087 htab->elf.sgot->contents + off);
3088 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3089
3090 elf_append_rel (output_bfd, sreloc, &outrel);
3091
3092 if (GOT_TLS_GD_P (tls_type))
3093 {
3094 if (indx == 0)
3095 {
3096 BFD_ASSERT (! unresolved_reloc);
3097 bfd_put_32 (output_bfd,
3098 relocation - _bfd_x86_elf_dtpoff_base (info),
3099 htab->elf.sgot->contents + off + 4);
3100 }
3101 else
3102 {
3103 bfd_put_32 (output_bfd, 0,
3104 htab->elf.sgot->contents + off + 4);
3105 outrel.r_info = ELF32_R_INFO (indx,
3106 R_386_TLS_DTPOFF32);
3107 outrel.r_offset += 4;
3108 elf_append_rel (output_bfd, sreloc, &outrel);
3109 }
3110 }
3111 else if (tls_type == GOT_TLS_IE_BOTH)
3112 {
3113 bfd_put_32 (output_bfd,
3114 (indx == 0
3115 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3116 : 0),
3117 htab->elf.sgot->contents + off + 4);
3118 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3119 outrel.r_offset += 4;
3120 elf_append_rel (output_bfd, sreloc, &outrel);
3121 }
3122
3123 dr_done:
3124 if (h != NULL)
3125 h->got.offset |= 1;
3126 else
3127 local_got_offsets[r_symndx] |= 1;
3128 }
3129
3130 if (off >= (bfd_vma) -2
3131 && ! GOT_TLS_GDESC_P (tls_type))
3132 abort ();
3133 if (r_type_tls == R_386_TLS_GOTDESC
3134 || r_type_tls == R_386_TLS_DESC_CALL)
3135 {
3136 relocation = htab->sgotplt_jump_table_size + offplt;
3137 unresolved_reloc = false;
3138 }
3139 else if (r_type_tls == r_type)
3140 {
3141 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3142 + htab->elf.sgotplt->output_offset;
3143 relocation = htab->elf.sgot->output_section->vma
3144 + htab->elf.sgot->output_offset + off - g_o_t;
3145 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3146 && tls_type == GOT_TLS_IE_BOTH)
3147 relocation += 4;
3148 if (r_type == R_386_TLS_IE)
3149 relocation += g_o_t;
3150 unresolved_reloc = false;
3151 }
3152 else if (r_type == R_386_TLS_GD)
3153 {
3154 unsigned int val, type;
3155 bfd_vma roff;
3156
3157 /* GD->IE transition. */
3158 type = *(contents + rel->r_offset - 2);
3159 val = *(contents + rel->r_offset - 1);
3160 if (type == 0x04)
3161 {
3162 /* Change
3163 leal foo@tlsgd(,%ebx,1), %eax
3164 call ___tls_get_addr@PLT
3165 into:
3166 movl %gs:0, %eax
3167 subl $foo@gottpoff(%ebx), %eax. */
3168 val >>= 3;
3169 roff = rel->r_offset - 3;
3170 }
3171 else
3172 {
3173 /* Change
3174 leal foo@tlsgd(%ebx), %eax
3175 call ___tls_get_addr@PLT
3176 nop
3177 or
3178 leal foo@tlsgd(%reg), %eax
3179 call *___tls_get_addr@GOT(%reg)
3180 which may be converted to
3181 addr32 call ___tls_get_addr
3182 into:
3183 movl %gs:0, %eax;
3184 subl $foo@gottpoff(%reg), %eax. */
3185 roff = rel->r_offset - 2;
3186 }
3187 memcpy (contents + roff,
3188 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3189 contents[roff + 7] = 0x80 | (val & 7);
3190 /* If foo is used only with foo@gotntpoff(%reg) and
3191 foo@indntpoff, but not with foo@gottpoff(%reg), change
3192 subl $foo@gottpoff(%reg), %eax
3193 into:
3194 addl $foo@gotntpoff(%reg), %eax. */
3195 if (tls_type == GOT_TLS_IE_POS)
3196 contents[roff + 6] = 0x03;
3197 bfd_put_32 (output_bfd,
3198 htab->elf.sgot->output_section->vma
3199 + htab->elf.sgot->output_offset + off
3200 - htab->elf.sgotplt->output_section->vma
3201 - htab->elf.sgotplt->output_offset,
3202 contents + roff + 8);
3203 /* Skip R_386_PLT32 and R_386_GOT32X. */
3204 rel++;
3205 wrel++;
3206 continue;
3207 }
3208 else if (r_type == R_386_TLS_GOTDESC)
3209 {
3210 /* GDesc -> IE transition.
3211 It's originally something like:
3212 leal x@tlsdesc(%ebx), %eax
3213
3214 Change it to:
3215 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3216 or:
3217 movl x@gottpoff(%ebx), %eax # before negl %eax
3218
3219 Registers other than %eax may be set up here. */
3220
3221 bfd_vma roff;
3222
3223 /* First, make sure it's a leal adding ebx to a 32-bit
3224 offset into any register, although it's probably
3225 almost always going to be eax. */
3226 roff = rel->r_offset;
3227
3228 /* Now modify the instruction as appropriate. */
3229 /* To turn a leal into a movl in the form we use it, it
3230 suffices to change the first byte from 0x8d to 0x8b.
3231 aoliva FIXME: should we decide to keep the leal, all
3232 we have to do is remove the statement below, and
3233 adjust the relaxation of R_386_TLS_DESC_CALL. */
3234 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3235
3236 if (tls_type == GOT_TLS_IE_BOTH)
3237 off += 4;
3238
3239 bfd_put_32 (output_bfd,
3240 htab->elf.sgot->output_section->vma
3241 + htab->elf.sgot->output_offset + off
3242 - htab->elf.sgotplt->output_section->vma
3243 - htab->elf.sgotplt->output_offset,
3244 contents + roff);
3245 continue;
3246 }
3247 else if (r_type == R_386_TLS_DESC_CALL)
3248 {
3249 /* GDesc -> IE transition.
3250 It's originally:
3251 call *(%eax)
3252
3253 Change it to:
3254 xchg %ax,%ax
3255 or
3256 negl %eax
3257 depending on how we transformed the TLS_GOTDESC above.
3258 */
3259
3260 bfd_vma roff;
3261
3262 roff = rel->r_offset;
3263
3264 /* Now modify the instruction as appropriate. */
3265 if (tls_type != GOT_TLS_IE_NEG)
3266 {
3267 /* xchg %ax,%ax */
3268 bfd_put_8 (output_bfd, 0x66, contents + roff);
3269 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3270 }
3271 else
3272 {
3273 /* negl %eax */
3274 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3275 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3276 }
3277
3278 continue;
3279 }
3280 else
3281 BFD_ASSERT (false);
3282 break;
3283
3284 case R_386_TLS_LDM:
3285 if (! elf_i386_tls_transition (info, input_bfd,
3286 input_section, contents,
3287 symtab_hdr, sym_hashes,
3288 &r_type, GOT_UNKNOWN, rel,
3289 relend, h, r_symndx, true))
3290 return false;
3291
3292 if (r_type != R_386_TLS_LDM)
3293 {
3294 /* LD->LE transition. Change
3295 leal foo@tlsldm(%ebx) %eax
3296 call ___tls_get_addr@PLT
3297 into:
3298 movl %gs:0, %eax
3299 nop
3300 leal 0(%esi,1), %esi
3301 or change
3302 leal foo@tlsldm(%reg) %eax
3303 call *___tls_get_addr@GOT(%reg)
3304 which may be converted to
3305 addr32 call ___tls_get_addr
3306 into:
3307 movl %gs:0, %eax
3308 leal 0(%esi), %esi */
3309 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3310 if (*(contents + rel->r_offset + 4) == 0xff
3311 || *(contents + rel->r_offset + 4) == 0x67)
3312 memcpy (contents + rel->r_offset - 2,
3313 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3314 else
3315 memcpy (contents + rel->r_offset - 2,
3316 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3317 /* Skip R_386_PC32/R_386_PLT32. */
3318 rel++;
3319 wrel++;
3320 continue;
3321 }
3322
3323 if (htab->elf.sgot == NULL)
3324 abort ();
3325
3326 off = htab->tls_ld_or_ldm_got.offset;
3327 if (off & 1)
3328 off &= ~1;
3329 else
3330 {
3331 Elf_Internal_Rela outrel;
3332
3333 if (htab->elf.srelgot == NULL)
3334 abort ();
3335
3336 outrel.r_offset = (htab->elf.sgot->output_section->vma
3337 + htab->elf.sgot->output_offset + off);
3338
3339 bfd_put_32 (output_bfd, 0,
3340 htab->elf.sgot->contents + off);
3341 bfd_put_32 (output_bfd, 0,
3342 htab->elf.sgot->contents + off + 4);
3343 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3344 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3345 htab->tls_ld_or_ldm_got.offset |= 1;
3346 }
3347 relocation = htab->elf.sgot->output_section->vma
3348 + htab->elf.sgot->output_offset + off
3349 - htab->elf.sgotplt->output_section->vma
3350 - htab->elf.sgotplt->output_offset;
3351 unresolved_reloc = false;
3352 break;
3353
3354 case R_386_TLS_LDO_32:
3355 if (!bfd_link_executable (info)
3356 || (input_section->flags & SEC_CODE) == 0)
3357 relocation -= _bfd_x86_elf_dtpoff_base (info);
3358 else
3359 /* When converting LDO to LE, we must negate. */
3360 relocation = -elf_i386_tpoff (info, relocation);
3361 break;
3362
3363 case R_386_TLS_LE_32:
3364 case R_386_TLS_LE:
3365 if (!bfd_link_executable (info))
3366 {
3367 Elf_Internal_Rela outrel;
3368 asection *sreloc;
3369
3370 outrel.r_offset = rel->r_offset
3371 + input_section->output_section->vma
3372 + input_section->output_offset;
3373 if (h != NULL && h->dynindx != -1)
3374 indx = h->dynindx;
3375 else
3376 indx = 0;
3377 if (r_type == R_386_TLS_LE_32)
3378 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3379 else
3380 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3381 sreloc = elf_section_data (input_section)->sreloc;
3382 if (sreloc == NULL)
3383 abort ();
3384 elf_append_rel (output_bfd, sreloc, &outrel);
3385 if (indx)
3386 continue;
3387 else if (r_type == R_386_TLS_LE_32)
3388 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3389 else
3390 relocation -= _bfd_x86_elf_dtpoff_base (info);
3391 }
3392 else if (r_type == R_386_TLS_LE_32)
3393 relocation = elf_i386_tpoff (info, relocation);
3394 else
3395 relocation = -elf_i386_tpoff (info, relocation);
3396 break;
3397
3398 default:
3399 break;
3400 }
3401
3402 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3403 because such sections are not SEC_ALLOC and thus ld.so will
3404 not process them. */
3405 if (unresolved_reloc
3406 && !((input_section->flags & SEC_DEBUGGING) != 0
3407 && h->def_dynamic)
3408 && _bfd_elf_section_offset (output_bfd, info, input_section,
3409 rel->r_offset) != (bfd_vma) -1)
3410 {
3411 _bfd_error_handler
3412 /* xgettext:c-format */
3413 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3414 input_bfd,
3415 input_section,
3416 (uint64_t) rel->r_offset,
3417 howto->name,
3418 h->root.root.string);
3419 return false;
3420 }
3421
3422 do_relocation:
3423 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3424 contents, rel->r_offset,
3425 relocation, 0);
3426
3427 check_relocation_error:
3428 if (r != bfd_reloc_ok)
3429 {
3430 const char *name;
3431
3432 if (h != NULL)
3433 name = h->root.root.string;
3434 else
3435 {
3436 name = bfd_elf_string_from_elf_section (input_bfd,
3437 symtab_hdr->sh_link,
3438 sym->st_name);
3439 if (name == NULL)
3440 return false;
3441 if (*name == '\0')
3442 name = bfd_section_name (sec);
3443 }
3444
3445 if (r == bfd_reloc_overflow)
3446 (*info->callbacks->reloc_overflow)
3447 (info, (h ? &h->root : NULL), name, howto->name,
3448 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3449 else
3450 {
3451 _bfd_error_handler
3452 /* xgettext:c-format */
3453 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3454 input_bfd, input_section,
3455 (uint64_t) rel->r_offset, name, (int) r);
3456 return false;
3457 }
3458 }
3459
3460 if (wrel != rel)
3461 *wrel = *rel;
3462 }
3463
3464 if (wrel != rel)
3465 {
3466 Elf_Internal_Shdr *rel_hdr;
3467 size_t deleted = rel - wrel;
3468
3469 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3470 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3471 if (rel_hdr->sh_size == 0)
3472 {
3473 /* It is too late to remove an empty reloc section. Leave
3474 one NONE reloc.
3475 ??? What is wrong with an empty section??? */
3476 rel_hdr->sh_size = rel_hdr->sh_entsize;
3477 deleted -= 1;
3478 }
3479 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3480 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3481 input_section->reloc_count -= deleted;
3482 }
3483
3484 return true;
3485 }
3486
3487 /* Finish up dynamic symbol handling. We set the contents of various
3488 dynamic sections here. */
3489
3490 static bool
3491 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3492 struct bfd_link_info *info,
3493 struct elf_link_hash_entry *h,
3494 Elf_Internal_Sym *sym)
3495 {
3496 struct elf_x86_link_hash_table *htab;
3497 unsigned plt_entry_size;
3498 struct elf_x86_link_hash_entry *eh;
3499 bool local_undefweak;
3500 bool use_plt_second;
3501
3502 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3503 if (htab == NULL)
3504 return false;
3505
3506 plt_entry_size = htab->plt.plt_entry_size;
3507
3508 /* Use the second PLT section only if there is .plt section. */
3509 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3510
3511 eh = (struct elf_x86_link_hash_entry *) h;
3512 if (eh->no_finish_dynamic_symbol)
3513 abort ();
3514
3515 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3516 resolved undefined weak symbols in executable so that their
3517 references have value 0 at run-time. */
3518 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3519
3520 if (h->plt.offset != (bfd_vma) -1)
3521 {
3522 bfd_vma plt_index, plt_offset;
3523 bfd_vma got_offset;
3524 Elf_Internal_Rela rel;
3525 bfd_byte *loc;
3526 asection *plt, *resolved_plt, *gotplt, *relplt;
3527
3528 /* When building a static executable, use .iplt, .igot.plt and
3529 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3530 if (htab->elf.splt != NULL)
3531 {
3532 plt = htab->elf.splt;
3533 gotplt = htab->elf.sgotplt;
3534 relplt = htab->elf.srelplt;
3535 }
3536 else
3537 {
3538 plt = htab->elf.iplt;
3539 gotplt = htab->elf.igotplt;
3540 relplt = htab->elf.irelplt;
3541 }
3542
3543 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3544
3545 /* Get the index in the procedure linkage table which
3546 corresponds to this symbol. This is the index of this symbol
3547 in all the symbols for which we are making plt entries. The
3548 first entry in the procedure linkage table is reserved.
3549
3550 Get the offset into the .got table of the entry that
3551 corresponds to this function. Each .got entry is 4 bytes.
3552 The first three are reserved.
3553
3554 For static executables, we don't reserve anything. */
3555
3556 if (plt == htab->elf.splt)
3557 {
3558 got_offset = (h->plt.offset / plt_entry_size
3559 - htab->plt.has_plt0);
3560 got_offset = (got_offset + 3) * 4;
3561 }
3562 else
3563 {
3564 got_offset = h->plt.offset / plt_entry_size;
3565 got_offset = got_offset * 4;
3566 }
3567
3568 /* Fill in the entry in the procedure linkage table and update
3569 the first slot. */
3570 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3571 plt_entry_size);
3572
3573 if (use_plt_second)
3574 {
3575 const bfd_byte *plt_entry;
3576 if (bfd_link_pic (info))
3577 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3578 else
3579 plt_entry = htab->non_lazy_plt->plt_entry;
3580 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3581 plt_entry, htab->non_lazy_plt->plt_entry_size);
3582
3583 resolved_plt = htab->plt_second;
3584 plt_offset = eh->plt_second.offset;
3585 }
3586 else
3587 {
3588 resolved_plt = plt;
3589 plt_offset = h->plt.offset;
3590 }
3591
3592 if (! bfd_link_pic (info))
3593 {
3594 bfd_put_32 (output_bfd,
3595 (gotplt->output_section->vma
3596 + gotplt->output_offset
3597 + got_offset),
3598 resolved_plt->contents + plt_offset
3599 + htab->plt.plt_got_offset);
3600
3601 if (htab->elf.target_os == is_vxworks)
3602 {
3603 int s, k, reloc_index;
3604
3605 /* Create the R_386_32 relocation referencing the GOT
3606 for this PLT entry. */
3607
3608 /* S: Current slot number (zero-based). */
3609 s = ((h->plt.offset - htab->plt.plt_entry_size)
3610 / htab->plt.plt_entry_size);
3611 /* K: Number of relocations for PLTResolve. */
3612 if (bfd_link_pic (info))
3613 k = PLTRESOLVE_RELOCS_SHLIB;
3614 else
3615 k = PLTRESOLVE_RELOCS;
3616 /* Skip the PLTresolve relocations, and the relocations for
3617 the other PLT slots. */
3618 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3619 loc = (htab->srelplt2->contents + reloc_index
3620 * sizeof (Elf32_External_Rel));
3621
3622 rel.r_offset = (plt->output_section->vma
3623 + plt->output_offset
3624 + h->plt.offset + 2),
3625 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3626 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3627
3628 /* Create the R_386_32 relocation referencing the beginning of
3629 the PLT for this GOT entry. */
3630 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3631 + htab->elf.sgotplt->output_offset
3632 + got_offset);
3633 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3634 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3635 loc + sizeof (Elf32_External_Rel));
3636 }
3637 }
3638 else
3639 {
3640 bfd_put_32 (output_bfd, got_offset,
3641 resolved_plt->contents + plt_offset
3642 + htab->plt.plt_got_offset);
3643 }
3644
3645 /* Fill in the entry in the global offset table. Leave the entry
3646 as zero for undefined weak symbol in PIE. No PLT relocation
3647 against undefined weak symbol in PIE. */
3648 if (!local_undefweak)
3649 {
3650 if (htab->plt.has_plt0)
3651 bfd_put_32 (output_bfd,
3652 (plt->output_section->vma
3653 + plt->output_offset
3654 + h->plt.offset
3655 + htab->lazy_plt->plt_lazy_offset),
3656 gotplt->contents + got_offset);
3657
3658 /* Fill in the entry in the .rel.plt section. */
3659 rel.r_offset = (gotplt->output_section->vma
3660 + gotplt->output_offset
3661 + got_offset);
3662 if (PLT_LOCAL_IFUNC_P (info, h))
3663 {
3664 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3665 h->root.root.string,
3666 h->root.u.def.section->owner);
3667
3668 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3669 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3670 in the .got.plt section. */
3671 bfd_put_32 (output_bfd,
3672 (h->root.u.def.value
3673 + h->root.u.def.section->output_section->vma
3674 + h->root.u.def.section->output_offset),
3675 gotplt->contents + got_offset);
3676 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3677
3678 if (htab->params->report_relative_reloc)
3679 _bfd_x86_elf_link_report_relative_reloc
3680 (info, relplt, h, sym, "R_386_IRELATIVE", &rel);
3681
3682 /* R_386_IRELATIVE comes last. */
3683 plt_index = htab->next_irelative_index--;
3684 }
3685 else
3686 {
3687 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3688 plt_index = htab->next_jump_slot_index++;
3689 }
3690
3691 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3692 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3693
3694 /* Don't fill the second and third slots in PLT entry for
3695 static executables nor without PLT0. */
3696 if (plt == htab->elf.splt && htab->plt.has_plt0)
3697 {
3698 bfd_put_32 (output_bfd,
3699 plt_index * sizeof (Elf32_External_Rel),
3700 plt->contents + h->plt.offset
3701 + htab->lazy_plt->plt_reloc_offset);
3702 bfd_put_32 (output_bfd,
3703 - (h->plt.offset
3704 + htab->lazy_plt->plt_plt_offset + 4),
3705 (plt->contents + h->plt.offset
3706 + htab->lazy_plt->plt_plt_offset));
3707 }
3708 }
3709 }
3710 else if (eh->plt_got.offset != (bfd_vma) -1)
3711 {
3712 bfd_vma got_offset, plt_offset;
3713 asection *plt, *got, *gotplt;
3714 const bfd_byte *got_plt_entry;
3715
3716 /* Set the entry in the GOT procedure linkage table. */
3717 plt = htab->plt_got;
3718 got = htab->elf.sgot;
3719 gotplt = htab->elf.sgotplt;
3720 got_offset = h->got.offset;
3721
3722 if (got_offset == (bfd_vma) -1
3723 || plt == NULL
3724 || got == NULL
3725 || gotplt == NULL)
3726 abort ();
3727
3728 /* Fill in the entry in the GOT procedure linkage table. */
3729 if (! bfd_link_pic (info))
3730 {
3731 got_plt_entry = htab->non_lazy_plt->plt_entry;
3732 got_offset += got->output_section->vma + got->output_offset;
3733 }
3734 else
3735 {
3736 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3737 got_offset += (got->output_section->vma
3738 + got->output_offset
3739 - gotplt->output_section->vma
3740 - gotplt->output_offset);
3741 }
3742
3743 plt_offset = eh->plt_got.offset;
3744 memcpy (plt->contents + plt_offset, got_plt_entry,
3745 htab->non_lazy_plt->plt_entry_size);
3746 bfd_put_32 (output_bfd, got_offset,
3747 (plt->contents + plt_offset
3748 + htab->non_lazy_plt->plt_got_offset));
3749 }
3750
3751 if (!local_undefweak
3752 && !h->def_regular
3753 && (h->plt.offset != (bfd_vma) -1
3754 || eh->plt_got.offset != (bfd_vma) -1))
3755 {
3756 /* Mark the symbol as undefined, rather than as defined in
3757 the .plt section. Leave the value if there were any
3758 relocations where pointer equality matters (this is a clue
3759 for the dynamic linker, to make function pointer
3760 comparisons work between an application and shared
3761 library), otherwise set it to zero. If a function is only
3762 called from a binary, there is no need to slow down
3763 shared libraries because of that. */
3764 sym->st_shndx = SHN_UNDEF;
3765 if (!h->pointer_equality_needed)
3766 sym->st_value = 0;
3767 }
3768
3769 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3770
3771 /* Don't generate dynamic GOT relocation against undefined weak
3772 symbol in executable. */
3773 if (h->got.offset != (bfd_vma) -1
3774 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3775 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3776 && !local_undefweak)
3777 {
3778 Elf_Internal_Rela rel;
3779 asection *relgot = htab->elf.srelgot;
3780 const char *relative_reloc_name = NULL;
3781
3782 /* This symbol has an entry in the global offset table. Set it
3783 up. */
3784
3785 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3786 abort ();
3787
3788 rel.r_offset = (htab->elf.sgot->output_section->vma
3789 + htab->elf.sgot->output_offset
3790 + (h->got.offset & ~(bfd_vma) 1));
3791
3792 /* If this is a static link, or it is a -Bsymbolic link and the
3793 symbol is defined locally or was forced to be local because
3794 of a version file, we just want to emit a RELATIVE reloc.
3795 The entry in the global offset table will already have been
3796 initialized in the relocate_section function. */
3797 if (h->def_regular
3798 && h->type == STT_GNU_IFUNC)
3799 {
3800 if (h->plt.offset == (bfd_vma) -1)
3801 {
3802 /* STT_GNU_IFUNC is referenced without PLT. */
3803 if (htab->elf.splt == NULL)
3804 {
3805 /* use .rel[a].iplt section to store .got relocations
3806 in static executable. */
3807 relgot = htab->elf.irelplt;
3808 }
3809 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3810 {
3811 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3812 h->root.root.string,
3813 h->root.u.def.section->owner);
3814
3815 bfd_put_32 (output_bfd,
3816 (h->root.u.def.value
3817 + h->root.u.def.section->output_section->vma
3818 + h->root.u.def.section->output_offset),
3819 htab->elf.sgot->contents + h->got.offset);
3820 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3821 relative_reloc_name = "R_386_IRELATIVE";
3822 }
3823 else
3824 goto do_glob_dat;
3825 }
3826 else if (bfd_link_pic (info))
3827 {
3828 /* Generate R_386_GLOB_DAT. */
3829 goto do_glob_dat;
3830 }
3831 else
3832 {
3833 asection *plt;
3834 bfd_vma plt_offset;
3835
3836 if (!h->pointer_equality_needed)
3837 abort ();
3838
3839 /* For non-shared object, we can't use .got.plt, which
3840 contains the real function addres if we need pointer
3841 equality. We load the GOT entry with the PLT entry. */
3842 if (htab->plt_second != NULL)
3843 {
3844 plt = htab->plt_second;
3845 plt_offset = eh->plt_second.offset;
3846 }
3847 else
3848 {
3849 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3850 plt_offset = h->plt.offset;
3851 }
3852 bfd_put_32 (output_bfd,
3853 (plt->output_section->vma
3854 + plt->output_offset + plt_offset),
3855 htab->elf.sgot->contents + h->got.offset);
3856 return true;
3857 }
3858 }
3859 else if (bfd_link_pic (info)
3860 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3861 {
3862 BFD_ASSERT((h->got.offset & 1) != 0);
3863 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3864 relative_reloc_name = "R_386_RELATIVE";
3865 }
3866 else
3867 {
3868 BFD_ASSERT((h->got.offset & 1) == 0);
3869 do_glob_dat:
3870 bfd_put_32 (output_bfd, (bfd_vma) 0,
3871 htab->elf.sgot->contents + h->got.offset);
3872 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3873 }
3874
3875 if (relative_reloc_name != NULL
3876 && htab->params->report_relative_reloc)
3877 _bfd_x86_elf_link_report_relative_reloc
3878 (info, relgot, h, sym, relative_reloc_name, &rel);
3879
3880 elf_append_rel (output_bfd, relgot, &rel);
3881 }
3882
3883 if (h->needs_copy)
3884 {
3885 Elf_Internal_Rela rel;
3886 asection *s;
3887
3888 /* This symbol needs a copy reloc. Set it up. */
3889 VERIFY_COPY_RELOC (h, htab)
3890
3891 rel.r_offset = (h->root.u.def.value
3892 + h->root.u.def.section->output_section->vma
3893 + h->root.u.def.section->output_offset);
3894 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3895 if (h->root.u.def.section == htab->elf.sdynrelro)
3896 s = htab->elf.sreldynrelro;
3897 else
3898 s = htab->elf.srelbss;
3899 elf_append_rel (output_bfd, s, &rel);
3900 }
3901
3902 return true;
3903 }
3904
3905 /* Finish up local dynamic symbol handling. We set the contents of
3906 various dynamic sections here. */
3907
3908 static int
3909 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3910 {
3911 struct elf_link_hash_entry *h
3912 = (struct elf_link_hash_entry *) *slot;
3913 struct bfd_link_info *info
3914 = (struct bfd_link_info *) inf;
3915
3916 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3917 h, NULL);
3918 }
3919
3920 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3921 here since undefined weak symbol may not be dynamic and may not be
3922 called for elf_i386_finish_dynamic_symbol. */
3923
3924 static bool
3925 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3926 void *inf)
3927 {
3928 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3929 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3930
3931 if (h->root.type != bfd_link_hash_undefweak
3932 || h->dynindx != -1)
3933 return true;
3934
3935 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3936 info, h, NULL);
3937 }
3938
3939 /* Used to decide how to sort relocs in an optimal manner for the
3940 dynamic linker, before writing them out. */
3941
3942 static enum elf_reloc_type_class
3943 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3944 const asection *rel_sec ATTRIBUTE_UNUSED,
3945 const Elf_Internal_Rela *rela)
3946 {
3947 bfd *abfd = info->output_bfd;
3948 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3949 struct elf_link_hash_table *htab = elf_hash_table (info);
3950
3951 if (htab->dynsym != NULL
3952 && htab->dynsym->contents != NULL)
3953 {
3954 /* Check relocation against STT_GNU_IFUNC symbol if there are
3955 dynamic symbols. */
3956 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3957 if (r_symndx != STN_UNDEF)
3958 {
3959 Elf_Internal_Sym sym;
3960 if (!bed->s->swap_symbol_in (abfd,
3961 (htab->dynsym->contents
3962 + r_symndx * sizeof (Elf32_External_Sym)),
3963 0, &sym))
3964 abort ();
3965
3966 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3967 return reloc_class_ifunc;
3968 }
3969 }
3970
3971 switch (ELF32_R_TYPE (rela->r_info))
3972 {
3973 case R_386_IRELATIVE:
3974 return reloc_class_ifunc;
3975 case R_386_RELATIVE:
3976 return reloc_class_relative;
3977 case R_386_JUMP_SLOT:
3978 return reloc_class_plt;
3979 case R_386_COPY:
3980 return reloc_class_copy;
3981 default:
3982 return reloc_class_normal;
3983 }
3984 }
3985
3986 /* Finish up the dynamic sections. */
3987
3988 static bool
3989 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3990 struct bfd_link_info *info)
3991 {
3992 struct elf_x86_link_hash_table *htab;
3993
3994 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3995 if (htab == NULL)
3996 return false;
3997
3998 if (!htab->elf.dynamic_sections_created)
3999 return true;
4000
4001 if (htab->elf.splt && htab->elf.splt->size > 0)
4002 {
4003 if (bfd_is_abs_section (htab->elf.splt->output_section))
4004 {
4005 info->callbacks->einfo
4006 (_("%F%P: discarded output section: `%pA'\n"),
4007 htab->elf.splt);
4008 return false;
4009 }
4010
4011 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4012 really seem like the right value. */
4013 elf_section_data (htab->elf.splt->output_section)
4014 ->this_hdr.sh_entsize = 4;
4015
4016 if (htab->plt.has_plt0)
4017 {
4018 /* Fill in the special first entry in the procedure linkage
4019 table. */
4020 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4021 htab->lazy_plt->plt0_entry_size);
4022 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4023 htab->plt0_pad_byte,
4024 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4025 if (!bfd_link_pic (info))
4026 {
4027 bfd_put_32 (output_bfd,
4028 (htab->elf.sgotplt->output_section->vma
4029 + htab->elf.sgotplt->output_offset
4030 + 4),
4031 htab->elf.splt->contents
4032 + htab->lazy_plt->plt0_got1_offset);
4033 bfd_put_32 (output_bfd,
4034 (htab->elf.sgotplt->output_section->vma
4035 + htab->elf.sgotplt->output_offset
4036 + 8),
4037 htab->elf.splt->contents
4038 + htab->lazy_plt->plt0_got2_offset);
4039
4040 if (htab->elf.target_os == is_vxworks)
4041 {
4042 Elf_Internal_Rela rel;
4043 int num_plts = (htab->elf.splt->size
4044 / htab->plt.plt_entry_size) - 1;
4045 unsigned char *p;
4046 asection *srelplt2 = htab->srelplt2;
4047
4048 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4049 + 4. On IA32 we use REL relocations so the
4050 addend goes in the PLT directly. */
4051 rel.r_offset = (htab->elf.splt->output_section->vma
4052 + htab->elf.splt->output_offset
4053 + htab->lazy_plt->plt0_got1_offset);
4054 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4055 R_386_32);
4056 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4057 srelplt2->contents);
4058 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4059 + 8. */
4060 rel.r_offset = (htab->elf.splt->output_section->vma
4061 + htab->elf.splt->output_offset
4062 + htab->lazy_plt->plt0_got2_offset);
4063 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4064 R_386_32);
4065 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4066 srelplt2->contents +
4067 sizeof (Elf32_External_Rel));
4068 /* Correct the .rel.plt.unloaded relocations. */
4069 p = srelplt2->contents;
4070 if (bfd_link_pic (info))
4071 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4072 else
4073 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4074
4075 for (; num_plts; num_plts--)
4076 {
4077 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4078 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4079 R_386_32);
4080 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4081 p += sizeof (Elf32_External_Rel);
4082
4083 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4084 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4085 R_386_32);
4086 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4087 p += sizeof (Elf32_External_Rel);
4088 }
4089 }
4090 }
4091 }
4092 }
4093
4094 /* Fill PLT entries for undefined weak symbols in PIE. */
4095 if (bfd_link_pie (info))
4096 bfd_hash_traverse (&info->hash->table,
4097 elf_i386_pie_finish_undefweak_symbol,
4098 info);
4099
4100 return true;
4101 }
4102
4103 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4104 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4105 It has to be done before elf_link_sort_relocs is called so that
4106 dynamic relocations are properly sorted. */
4107
4108 static bool
4109 elf_i386_output_arch_local_syms
4110 (bfd *output_bfd ATTRIBUTE_UNUSED,
4111 struct bfd_link_info *info,
4112 void *flaginfo ATTRIBUTE_UNUSED,
4113 int (*func) (void *, const char *,
4114 Elf_Internal_Sym *,
4115 asection *,
4116 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4117 {
4118 struct elf_x86_link_hash_table *htab
4119 = elf_x86_hash_table (info, I386_ELF_DATA);
4120 if (htab == NULL)
4121 return false;
4122
4123 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4124 htab_traverse (htab->loc_hash_table,
4125 elf_i386_finish_local_dynamic_symbol,
4126 info);
4127
4128 return true;
4129 }
4130
4131 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4132 dynamic relocations. */
4133
4134 static long
4135 elf_i386_get_synthetic_symtab (bfd *abfd,
4136 long symcount ATTRIBUTE_UNUSED,
4137 asymbol **syms ATTRIBUTE_UNUSED,
4138 long dynsymcount,
4139 asymbol **dynsyms,
4140 asymbol **ret)
4141 {
4142 long count, i, n;
4143 int j;
4144 bfd_byte *plt_contents;
4145 long relsize;
4146 const struct elf_x86_lazy_plt_layout *lazy_plt;
4147 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4148 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4149 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4150 asection *plt;
4151 bfd_vma got_addr;
4152 enum elf_x86_plt_type plt_type;
4153 struct elf_x86_plt plts[] =
4154 {
4155 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4156 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4157 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4158 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4159 };
4160
4161 *ret = NULL;
4162
4163 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4164 return 0;
4165
4166 if (dynsymcount <= 0)
4167 return 0;
4168
4169 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4170 if (relsize <= 0)
4171 return -1;
4172
4173 non_lazy_plt = NULL;
4174 /* Silence GCC 6. */
4175 lazy_plt = NULL;
4176 non_lazy_ibt_plt = NULL;
4177 lazy_ibt_plt = NULL;
4178 switch (get_elf_backend_data (abfd)->target_os)
4179 {
4180 case is_normal:
4181 case is_solaris:
4182 non_lazy_plt = &elf_i386_non_lazy_plt;
4183 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4184 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4185 /* Fall through */
4186 case is_vxworks:
4187 lazy_plt = &elf_i386_lazy_plt;
4188 break;
4189 default:
4190 abort ();
4191 }
4192
4193 got_addr = 0;
4194
4195 count = 0;
4196 for (j = 0; plts[j].name != NULL; j++)
4197 {
4198 plt = bfd_get_section_by_name (abfd, plts[j].name);
4199 if (plt == NULL || plt->size == 0)
4200 continue;
4201
4202 /* Get the PLT section contents. */
4203 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4204 if (plt_contents == NULL)
4205 break;
4206 if (!bfd_get_section_contents (abfd, (asection *) plt,
4207 plt_contents, 0, plt->size))
4208 {
4209 free (plt_contents);
4210 break;
4211 }
4212
4213 /* Check what kind of PLT it is. */
4214 plt_type = plt_unknown;
4215 if (plts[j].type == plt_unknown
4216 && (plt->size >= (lazy_plt->plt0_entry_size
4217 + lazy_plt->plt_entry_size)))
4218 {
4219 /* Match lazy PLT first. */
4220 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4221 lazy_plt->plt0_got1_offset) == 0)
4222 {
4223 /* The fist entry in the lazy IBT PLT is the same as the
4224 normal lazy PLT. */
4225 if (lazy_ibt_plt != NULL
4226 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4227 lazy_ibt_plt->plt_entry,
4228 lazy_ibt_plt->plt_got_offset) == 0))
4229 plt_type = plt_lazy | plt_second;
4230 else
4231 plt_type = plt_lazy;
4232 }
4233 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4234 lazy_plt->plt0_got1_offset) == 0)
4235 {
4236 /* The fist entry in the PIC lazy IBT PLT is the same as
4237 the normal PIC lazy PLT. */
4238 if (lazy_ibt_plt != NULL
4239 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4240 lazy_ibt_plt->pic_plt_entry,
4241 lazy_ibt_plt->plt_got_offset) == 0))
4242 plt_type = plt_lazy | plt_pic | plt_second;
4243 else
4244 plt_type = plt_lazy | plt_pic;
4245 }
4246 }
4247
4248 if (non_lazy_plt != NULL
4249 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4250 && plt->size >= non_lazy_plt->plt_entry_size)
4251 {
4252 /* Match non-lazy PLT. */
4253 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4254 non_lazy_plt->plt_got_offset) == 0)
4255 plt_type = plt_non_lazy;
4256 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4257 non_lazy_plt->plt_got_offset) == 0)
4258 plt_type = plt_pic;
4259 }
4260
4261 if ((non_lazy_ibt_plt != NULL)
4262 && (plt_type == plt_unknown || plt_type == plt_second)
4263 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4264 {
4265 if (memcmp (plt_contents,
4266 non_lazy_ibt_plt->plt_entry,
4267 non_lazy_ibt_plt->plt_got_offset) == 0)
4268 {
4269 /* Match IBT PLT. */
4270 plt_type = plt_second;
4271 non_lazy_plt = non_lazy_ibt_plt;
4272 }
4273 else if (memcmp (plt_contents,
4274 non_lazy_ibt_plt->pic_plt_entry,
4275 non_lazy_ibt_plt->plt_got_offset) == 0)
4276 {
4277 /* Match PIC IBT PLT. */
4278 plt_type = plt_second | plt_pic;
4279 non_lazy_plt = non_lazy_ibt_plt;
4280 }
4281 }
4282
4283 if (plt_type == plt_unknown)
4284 {
4285 free (plt_contents);
4286 continue;
4287 }
4288
4289 plts[j].sec = plt;
4290 plts[j].type = plt_type;
4291
4292 if ((plt_type & plt_lazy))
4293 {
4294 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4295 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4296 /* Skip PLT0 in lazy PLT. */
4297 i = 1;
4298 }
4299 else
4300 {
4301 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4302 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4303 i = 0;
4304 }
4305
4306 /* Skip lazy PLT when the second PLT is used. */
4307 if ((plt_type & (plt_lazy | plt_second))
4308 == (plt_lazy | plt_second))
4309 plts[j].count = 0;
4310 else
4311 {
4312 n = plt->size / plts[j].plt_entry_size;
4313 plts[j].count = n;
4314 count += n - i;
4315 }
4316
4317 plts[j].contents = plt_contents;
4318
4319 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4320 if ((plt_type & plt_pic))
4321 got_addr = (bfd_vma) -1;
4322 }
4323
4324 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4325 got_addr, plts, dynsyms,
4326 ret);
4327 }
4328
4329 /* Set up i386 GNU properties. Return the first relocatable ELF input
4330 with GNU properties if found. Otherwise, return NULL. */
4331
4332 static bfd *
4333 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4334 {
4335 struct elf_x86_init_table init_table;
4336
4337 switch (get_elf_backend_data (info->output_bfd)->target_os)
4338 {
4339 case is_normal:
4340 case is_solaris:
4341 init_table.plt0_pad_byte = 0x0;
4342 init_table.lazy_plt = &elf_i386_lazy_plt;
4343 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4344 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4345 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4346 break;
4347 case is_vxworks:
4348 init_table.plt0_pad_byte = 0x90;
4349 init_table.lazy_plt = &elf_i386_lazy_plt;
4350 init_table.non_lazy_plt = NULL;
4351 init_table.lazy_ibt_plt = NULL;
4352 init_table.non_lazy_ibt_plt = NULL;
4353 break;
4354 default:
4355 abort ();
4356 }
4357
4358 init_table.r_info = elf32_r_info;
4359 init_table.r_sym = elf32_r_sym;
4360
4361 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4362 }
4363
4364 #define TARGET_LITTLE_SYM i386_elf32_vec
4365 #define TARGET_LITTLE_NAME "elf32-i386"
4366 #define ELF_ARCH bfd_arch_i386
4367 #define ELF_TARGET_ID I386_ELF_DATA
4368 #define ELF_MACHINE_CODE EM_386
4369 #define ELF_MAXPAGESIZE 0x1000
4370
4371 #define elf_backend_can_gc_sections 1
4372 #define elf_backend_can_refcount 1
4373 #define elf_backend_want_got_plt 1
4374 #define elf_backend_plt_readonly 1
4375 #define elf_backend_want_plt_sym 0
4376 #define elf_backend_got_header_size 12
4377 #define elf_backend_plt_alignment 4
4378 #define elf_backend_dtrel_excludes_plt 1
4379 #define elf_backend_extern_protected_data 1
4380 #define elf_backend_caches_rawsize 1
4381 #define elf_backend_want_dynrelro 1
4382
4383 /* Support RELA for objdump of prelink objects. */
4384 #define elf_info_to_howto elf_i386_info_to_howto_rel
4385 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4386
4387 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4388 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4389 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4390 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4391
4392 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4393 #define elf_backend_check_relocs elf_i386_check_relocs
4394 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4395 #define elf_backend_fake_sections elf_i386_fake_sections
4396 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4397 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4398 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4399 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4400 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4401 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4402 #define elf_backend_relocate_section elf_i386_relocate_section
4403 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4404 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4405
4406 #define elf_backend_linux_prpsinfo32_ugid16 true
4407
4408 #define elf32_bed elf32_i386_bed
4409
4410 #include "elf32-target.h"
4411
4412 /* FreeBSD support. */
4413
4414 #undef TARGET_LITTLE_SYM
4415 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4416 #undef TARGET_LITTLE_NAME
4417 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4418 #undef ELF_OSABI
4419 #define ELF_OSABI ELFOSABI_FREEBSD
4420
4421 /* The kernel recognizes executables as valid only if they carry a
4422 "FreeBSD" label in the ELF header. So we put this label on all
4423 executables and (for simplicity) also all other object files. */
4424
4425 static bool
4426 elf_i386_fbsd_init_file_header (bfd *abfd, struct bfd_link_info *info)
4427 {
4428 if (!_bfd_elf_init_file_header (abfd, info))
4429 return false;
4430
4431 #ifdef OLD_FREEBSD_ABI_LABEL
4432 {
4433 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4434 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4435 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4436 }
4437 #endif
4438 return true;
4439 }
4440
4441 #undef elf_backend_init_file_header
4442 #define elf_backend_init_file_header elf_i386_fbsd_init_file_header
4443 #undef elf32_bed
4444 #define elf32_bed elf32_i386_fbsd_bed
4445
4446 #undef elf_backend_add_symbol_hook
4447
4448 #include "elf32-target.h"
4449
4450 #undef elf_backend_init_file_header
4451
4452 /* Solaris 2. */
4453
4454 #undef TARGET_LITTLE_SYM
4455 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4456 #undef TARGET_LITTLE_NAME
4457 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4458
4459 #undef ELF_TARGET_OS
4460 #define ELF_TARGET_OS is_solaris
4461
4462 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4463 objects won't be recognized. */
4464 #undef ELF_OSABI
4465
4466 #undef elf32_bed
4467 #define elf32_bed elf32_i386_sol2_bed
4468
4469 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4470 boundary. */
4471 #undef elf_backend_static_tls_alignment
4472 #define elf_backend_static_tls_alignment 8
4473
4474 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4475
4476 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4477 File, p.63. */
4478 #undef elf_backend_want_plt_sym
4479 #define elf_backend_want_plt_sym 1
4480
4481 #undef elf_backend_strtab_flags
4482 #define elf_backend_strtab_flags SHF_STRINGS
4483
4484 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4485 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4486 FALSE otherwise. ISECTION is the best guess matching section from the
4487 input bfd IBFD, but it might be NULL. */
4488
4489 static bool
4490 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4491 bfd *obfd ATTRIBUTE_UNUSED,
4492 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4493 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4494 {
4495 /* PR 19938: FIXME: Need to add code for setting the sh_info
4496 and sh_link fields of Solaris specific section types. */
4497 return false;
4498
4499 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4500 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4501
4502 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4503
4504 The following values should be set:
4505
4506 Type Link Info
4507 -----------------------------------------------------------------------------
4508 SHT_SUNW_ancillary The section header index of 0
4509 [0x6fffffee] the associated string table.
4510
4511 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4512 [0x6ffffff0] the associated symbol table. section header index of
4513 the associated
4514 SHT_SUNW_capchain table,
4515 otherwise 0.
4516
4517 SHT_SUNW_symsort The section header index of 0
4518 [0x6ffffff1] the associated symbol table.
4519
4520 SHT_SUNW_tlssort The section header index of 0
4521 [0x6ffffff2] the associated symbol table.
4522
4523 SHT_SUNW_LDYNSYM The section header index of One greater than the
4524 [0x6ffffff3] the associated string table. symbol table index of the
4525 This index is the same string last local symbol,
4526 table used by the SHT_DYNSYM STB_LOCAL. Since
4527 section. SHT_SUNW_LDYNSYM only
4528 contains local symbols,
4529 sh_info is equivalent to
4530 the number of symbols in
4531 the table.
4532
4533 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4534 [0x6ffffff5] the section header index of to named strings, the
4535 the associated section header index of
4536 SHT_SUNW_capinfo table, the associated string
4537 otherwise 0. table, otherwise 0.
4538
4539 SHT_SUNW_move The section header index of 0
4540 [0x6ffffffa] the associated symbol table.
4541
4542 SHT_SUNW_COMDAT 0 0
4543 [0x6ffffffb]
4544
4545 SHT_SUNW_syminfo The section header index of The section header index
4546 [0x6ffffffc] the associated symbol table. of the associated
4547 .dynamic section.
4548
4549 SHT_SUNW_verdef The section header index of The number of version
4550 [0x6ffffffd] the associated string table. definitions within the
4551 section.
4552
4553 SHT_SUNW_verneed The section header index of The number of version
4554 [0x6ffffffe] the associated string table. dependencies within the
4555 section.
4556
4557 SHT_SUNW_versym The section header index of 0
4558 [0x6fffffff] the associated symbol table. */
4559 }
4560
4561 #undef elf_backend_copy_special_section_fields
4562 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4563
4564 #include "elf32-target.h"
4565
4566 /* Intel MCU support. */
4567
4568 static bool
4569 elf32_iamcu_elf_object_p (bfd *abfd)
4570 {
4571 /* Set the right machine number for an IAMCU elf32 file. */
4572 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4573 return true;
4574 }
4575
4576 #undef TARGET_LITTLE_SYM
4577 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4578 #undef TARGET_LITTLE_NAME
4579 #define TARGET_LITTLE_NAME "elf32-iamcu"
4580 #undef ELF_ARCH
4581 #define ELF_ARCH bfd_arch_iamcu
4582
4583 #undef ELF_MACHINE_CODE
4584 #define ELF_MACHINE_CODE EM_IAMCU
4585
4586 #undef ELF_TARGET_OS
4587 #undef ELF_OSABI
4588
4589 #undef elf32_bed
4590 #define elf32_bed elf32_iamcu_bed
4591
4592 #undef elf_backend_object_p
4593 #define elf_backend_object_p elf32_iamcu_elf_object_p
4594
4595 #undef elf_backend_static_tls_alignment
4596
4597 #undef elf_backend_want_plt_sym
4598 #define elf_backend_want_plt_sym 0
4599
4600 #undef elf_backend_strtab_flags
4601 #undef elf_backend_copy_special_section_fields
4602
4603 #include "elf32-target.h"
4604
4605 /* Restore defaults. */
4606 #undef ELF_ARCH
4607 #define ELF_ARCH bfd_arch_i386
4608 #undef ELF_MACHINE_CODE
4609 #define ELF_MACHINE_CODE EM_386
4610 #undef elf_backend_object_p
4611
4612 /* VxWorks support. */
4613
4614 #undef TARGET_LITTLE_SYM
4615 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4616 #undef TARGET_LITTLE_NAME
4617 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4618 #undef ELF_OSABI
4619 #undef ELF_MAXPAGESIZE
4620 #define ELF_MAXPAGESIZE 0x1000
4621 #undef elf_backend_plt_alignment
4622 #define elf_backend_plt_alignment 4
4623
4624 #undef ELF_TARGET_OS
4625 #define ELF_TARGET_OS is_vxworks
4626
4627 #undef elf_backend_relocs_compatible
4628 #undef elf_backend_add_symbol_hook
4629 #define elf_backend_add_symbol_hook \
4630 elf_vxworks_add_symbol_hook
4631 #undef elf_backend_link_output_symbol_hook
4632 #define elf_backend_link_output_symbol_hook \
4633 elf_vxworks_link_output_symbol_hook
4634 #undef elf_backend_emit_relocs
4635 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4636 #undef elf_backend_final_write_processing
4637 #define elf_backend_final_write_processing \
4638 elf_vxworks_final_write_processing
4639 #undef elf_backend_static_tls_alignment
4640
4641 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4642 define it. */
4643 #undef elf_backend_want_plt_sym
4644 #define elf_backend_want_plt_sym 1
4645
4646 #undef elf32_bed
4647 #define elf32_bed elf32_i386_vxworks_bed
4648
4649 #include "elf32-target.h"