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