1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2018 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
21 #include "elfxx-x86.h"
23 #include "elf-vxworks.h"
25 #include "opcode/i386.h"
27 /* 386 uses REL relocations instead of RELA. */
32 static reloc_howto_type elf_howto_table[]=
34 HOWTO(R_386_NONE, 0, 3, 0, FALSE, 0, complain_overflow_dont,
35 bfd_elf_generic_reloc, "R_386_NONE",
36 TRUE, 0x00000000, 0x00000000, FALSE),
37 HOWTO(R_386_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
38 bfd_elf_generic_reloc, "R_386_32",
39 TRUE, 0xffffffff, 0xffffffff, FALSE),
40 HOWTO(R_386_PC32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
41 bfd_elf_generic_reloc, "R_386_PC32",
42 TRUE, 0xffffffff, 0xffffffff, TRUE),
43 HOWTO(R_386_GOT32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
44 bfd_elf_generic_reloc, "R_386_GOT32",
45 TRUE, 0xffffffff, 0xffffffff, FALSE),
46 HOWTO(R_386_PLT32, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
47 bfd_elf_generic_reloc, "R_386_PLT32",
48 TRUE, 0xffffffff, 0xffffffff, TRUE),
49 HOWTO(R_386_COPY, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
50 bfd_elf_generic_reloc, "R_386_COPY",
51 TRUE, 0xffffffff, 0xffffffff, FALSE),
52 HOWTO(R_386_GLOB_DAT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
53 bfd_elf_generic_reloc, "R_386_GLOB_DAT",
54 TRUE, 0xffffffff, 0xffffffff, FALSE),
55 HOWTO(R_386_JUMP_SLOT, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
56 bfd_elf_generic_reloc, "R_386_JUMP_SLOT",
57 TRUE, 0xffffffff, 0xffffffff, FALSE),
58 HOWTO(R_386_RELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
59 bfd_elf_generic_reloc, "R_386_RELATIVE",
60 TRUE, 0xffffffff, 0xffffffff, FALSE),
61 HOWTO(R_386_GOTOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
62 bfd_elf_generic_reloc, "R_386_GOTOFF",
63 TRUE, 0xffffffff, 0xffffffff, FALSE),
64 HOWTO(R_386_GOTPC, 0, 2, 32, TRUE, 0, complain_overflow_bitfield,
65 bfd_elf_generic_reloc, "R_386_GOTPC",
66 TRUE, 0xffffffff, 0xffffffff, TRUE),
68 /* We have a gap in the reloc numbers here.
69 R_386_standard counts the number up to this point, and
70 R_386_ext_offset is the value to subtract from a reloc type of
71 R_386_16 thru R_386_PC8 to form an index into this table. */
72 #define R_386_standard (R_386_GOTPC + 1)
73 #define R_386_ext_offset (R_386_TLS_TPOFF - R_386_standard)
75 /* These relocs are a GNU extension. */
76 HOWTO(R_386_TLS_TPOFF, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
77 bfd_elf_generic_reloc, "R_386_TLS_TPOFF",
78 TRUE, 0xffffffff, 0xffffffff, FALSE),
79 HOWTO(R_386_TLS_IE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
80 bfd_elf_generic_reloc, "R_386_TLS_IE",
81 TRUE, 0xffffffff, 0xffffffff, FALSE),
82 HOWTO(R_386_TLS_GOTIE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
83 bfd_elf_generic_reloc, "R_386_TLS_GOTIE",
84 TRUE, 0xffffffff, 0xffffffff, FALSE),
85 HOWTO(R_386_TLS_LE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
86 bfd_elf_generic_reloc, "R_386_TLS_LE",
87 TRUE, 0xffffffff, 0xffffffff, FALSE),
88 HOWTO(R_386_TLS_GD, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
89 bfd_elf_generic_reloc, "R_386_TLS_GD",
90 TRUE, 0xffffffff, 0xffffffff, FALSE),
91 HOWTO(R_386_TLS_LDM, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
92 bfd_elf_generic_reloc, "R_386_TLS_LDM",
93 TRUE, 0xffffffff, 0xffffffff, FALSE),
94 HOWTO(R_386_16, 0, 1, 16, FALSE, 0, complain_overflow_bitfield,
95 bfd_elf_generic_reloc, "R_386_16",
96 TRUE, 0xffff, 0xffff, FALSE),
97 HOWTO(R_386_PC16, 0, 1, 16, TRUE, 0, complain_overflow_bitfield,
98 bfd_elf_generic_reloc, "R_386_PC16",
99 TRUE, 0xffff, 0xffff, TRUE),
100 HOWTO(R_386_8, 0, 0, 8, FALSE, 0, complain_overflow_bitfield,
101 bfd_elf_generic_reloc, "R_386_8",
102 TRUE, 0xff, 0xff, FALSE),
103 HOWTO(R_386_PC8, 0, 0, 8, TRUE, 0, complain_overflow_signed,
104 bfd_elf_generic_reloc, "R_386_PC8",
105 TRUE, 0xff, 0xff, TRUE),
107 #define R_386_ext (R_386_PC8 + 1 - R_386_ext_offset)
108 #define R_386_tls_offset (R_386_TLS_LDO_32 - R_386_ext)
109 /* These are common with Solaris TLS implementation. */
110 HOWTO(R_386_TLS_LDO_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
111 bfd_elf_generic_reloc, "R_386_TLS_LDO_32",
112 TRUE, 0xffffffff, 0xffffffff, FALSE),
113 HOWTO(R_386_TLS_IE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
114 bfd_elf_generic_reloc, "R_386_TLS_IE_32",
115 TRUE, 0xffffffff, 0xffffffff, FALSE),
116 HOWTO(R_386_TLS_LE_32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
117 bfd_elf_generic_reloc, "R_386_TLS_LE_32",
118 TRUE, 0xffffffff, 0xffffffff, FALSE),
119 HOWTO(R_386_TLS_DTPMOD32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
120 bfd_elf_generic_reloc, "R_386_TLS_DTPMOD32",
121 TRUE, 0xffffffff, 0xffffffff, FALSE),
122 HOWTO(R_386_TLS_DTPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
123 bfd_elf_generic_reloc, "R_386_TLS_DTPOFF32",
124 TRUE, 0xffffffff, 0xffffffff, FALSE),
125 HOWTO(R_386_TLS_TPOFF32, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
126 bfd_elf_generic_reloc, "R_386_TLS_TPOFF32",
127 TRUE, 0xffffffff, 0xffffffff, FALSE),
128 HOWTO(R_386_SIZE32, 0, 2, 32, FALSE, 0, complain_overflow_unsigned,
129 bfd_elf_generic_reloc, "R_386_SIZE32",
130 TRUE, 0xffffffff, 0xffffffff, FALSE),
131 HOWTO(R_386_TLS_GOTDESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
132 bfd_elf_generic_reloc, "R_386_TLS_GOTDESC",
133 TRUE, 0xffffffff, 0xffffffff, FALSE),
134 HOWTO(R_386_TLS_DESC_CALL, 0, 0, 0, FALSE, 0, complain_overflow_dont,
135 bfd_elf_generic_reloc, "R_386_TLS_DESC_CALL",
137 HOWTO(R_386_TLS_DESC, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
138 bfd_elf_generic_reloc, "R_386_TLS_DESC",
139 TRUE, 0xffffffff, 0xffffffff, FALSE),
140 HOWTO(R_386_IRELATIVE, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
141 bfd_elf_generic_reloc, "R_386_IRELATIVE",
142 TRUE, 0xffffffff, 0xffffffff, FALSE),
143 HOWTO(R_386_GOT32X, 0, 2, 32, FALSE, 0, complain_overflow_bitfield,
144 bfd_elf_generic_reloc, "R_386_GOT32X",
145 TRUE, 0xffffffff, 0xffffffff, FALSE),
148 #define R_386_ext2 (R_386_GOT32X + 1 - R_386_tls_offset)
149 #define R_386_vt_offset (R_386_GNU_VTINHERIT - R_386_ext2)
151 /* GNU extension to record C++ vtable hierarchy. */
152 HOWTO (R_386_GNU_VTINHERIT, /* type */
154 2, /* size (0 = byte, 1 = short, 2 = long) */
156 FALSE, /* pc_relative */
158 complain_overflow_dont, /* complain_on_overflow */
159 NULL, /* special_function */
160 "R_386_GNU_VTINHERIT", /* name */
161 FALSE, /* partial_inplace */
164 FALSE), /* pcrel_offset */
166 /* GNU extension to record C++ vtable member usage. */
167 HOWTO (R_386_GNU_VTENTRY, /* type */
169 2, /* size (0 = byte, 1 = short, 2 = long) */
171 FALSE, /* pc_relative */
173 complain_overflow_dont, /* complain_on_overflow */
174 _bfd_elf_rel_vtable_reloc_fn, /* special_function */
175 "R_386_GNU_VTENTRY", /* name */
176 FALSE, /* partial_inplace */
179 FALSE) /* pcrel_offset */
181 #define R_386_vt (R_386_GNU_VTENTRY + 1 - R_386_vt_offset)
185 #define X86_PCREL_TYPE_P(TYPE) ((TYPE) == R_386_PC32)
187 #define X86_SIZE_TYPE_P(TYPE) ((TYPE) == R_386_SIZE32)
189 #ifdef DEBUG_GEN_RELOC
191 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
196 static reloc_howto_type *
197 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
198 bfd_reloc_code_real_type code)
203 TRACE ("BFD_RELOC_NONE");
204 return &elf_howto_table[R_386_NONE];
207 TRACE ("BFD_RELOC_32");
208 return &elf_howto_table[R_386_32];
211 TRACE ("BFD_RELOC_CTOR");
212 return &elf_howto_table[R_386_32];
214 case BFD_RELOC_32_PCREL:
215 TRACE ("BFD_RELOC_PC32");
216 return &elf_howto_table[R_386_PC32];
218 case BFD_RELOC_386_GOT32:
219 TRACE ("BFD_RELOC_386_GOT32");
220 return &elf_howto_table[R_386_GOT32];
222 case BFD_RELOC_386_PLT32:
223 TRACE ("BFD_RELOC_386_PLT32");
224 return &elf_howto_table[R_386_PLT32];
226 case BFD_RELOC_386_COPY:
227 TRACE ("BFD_RELOC_386_COPY");
228 return &elf_howto_table[R_386_COPY];
230 case BFD_RELOC_386_GLOB_DAT:
231 TRACE ("BFD_RELOC_386_GLOB_DAT");
232 return &elf_howto_table[R_386_GLOB_DAT];
234 case BFD_RELOC_386_JUMP_SLOT:
235 TRACE ("BFD_RELOC_386_JUMP_SLOT");
236 return &elf_howto_table[R_386_JUMP_SLOT];
238 case BFD_RELOC_386_RELATIVE:
239 TRACE ("BFD_RELOC_386_RELATIVE");
240 return &elf_howto_table[R_386_RELATIVE];
242 case BFD_RELOC_386_GOTOFF:
243 TRACE ("BFD_RELOC_386_GOTOFF");
244 return &elf_howto_table[R_386_GOTOFF];
246 case BFD_RELOC_386_GOTPC:
247 TRACE ("BFD_RELOC_386_GOTPC");
248 return &elf_howto_table[R_386_GOTPC];
250 /* These relocs are a GNU extension. */
251 case BFD_RELOC_386_TLS_TPOFF:
252 TRACE ("BFD_RELOC_386_TLS_TPOFF");
253 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
255 case BFD_RELOC_386_TLS_IE:
256 TRACE ("BFD_RELOC_386_TLS_IE");
257 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
259 case BFD_RELOC_386_TLS_GOTIE:
260 TRACE ("BFD_RELOC_386_TLS_GOTIE");
261 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
263 case BFD_RELOC_386_TLS_LE:
264 TRACE ("BFD_RELOC_386_TLS_LE");
265 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
267 case BFD_RELOC_386_TLS_GD:
268 TRACE ("BFD_RELOC_386_TLS_GD");
269 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
271 case BFD_RELOC_386_TLS_LDM:
272 TRACE ("BFD_RELOC_386_TLS_LDM");
273 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
276 TRACE ("BFD_RELOC_16");
277 return &elf_howto_table[R_386_16 - R_386_ext_offset];
279 case BFD_RELOC_16_PCREL:
280 TRACE ("BFD_RELOC_16_PCREL");
281 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
284 TRACE ("BFD_RELOC_8");
285 return &elf_howto_table[R_386_8 - R_386_ext_offset];
287 case BFD_RELOC_8_PCREL:
288 TRACE ("BFD_RELOC_8_PCREL");
289 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
291 /* Common with Sun TLS implementation. */
292 case BFD_RELOC_386_TLS_LDO_32:
293 TRACE ("BFD_RELOC_386_TLS_LDO_32");
294 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
296 case BFD_RELOC_386_TLS_IE_32:
297 TRACE ("BFD_RELOC_386_TLS_IE_32");
298 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
300 case BFD_RELOC_386_TLS_LE_32:
301 TRACE ("BFD_RELOC_386_TLS_LE_32");
302 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
304 case BFD_RELOC_386_TLS_DTPMOD32:
305 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
306 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
308 case BFD_RELOC_386_TLS_DTPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
310 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
312 case BFD_RELOC_386_TLS_TPOFF32:
313 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
314 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
316 case BFD_RELOC_SIZE32:
317 TRACE ("BFD_RELOC_SIZE32");
318 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
320 case BFD_RELOC_386_TLS_GOTDESC:
321 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
322 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
324 case BFD_RELOC_386_TLS_DESC_CALL:
325 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
326 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
328 case BFD_RELOC_386_TLS_DESC:
329 TRACE ("BFD_RELOC_386_TLS_DESC");
330 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
332 case BFD_RELOC_386_IRELATIVE:
333 TRACE ("BFD_RELOC_386_IRELATIVE");
334 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
336 case BFD_RELOC_386_GOT32X:
337 TRACE ("BFD_RELOC_386_GOT32X");
338 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
340 case BFD_RELOC_VTABLE_INHERIT:
341 TRACE ("BFD_RELOC_VTABLE_INHERIT");
342 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
344 case BFD_RELOC_VTABLE_ENTRY:
345 TRACE ("BFD_RELOC_VTABLE_ENTRY");
346 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
356 static reloc_howto_type *
357 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
362 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
363 if (elf_howto_table[i].name != NULL
364 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
365 return &elf_howto_table[i];
370 static reloc_howto_type *
371 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
375 if ((indx = r_type) >= R_386_standard
376 && ((indx = r_type - R_386_ext_offset) - R_386_standard
377 >= R_386_ext - R_386_standard)
378 && ((indx = r_type - R_386_tls_offset) - R_386_ext
379 >= R_386_ext2 - R_386_ext)
380 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
381 >= R_386_vt - R_386_ext2))
383 /* xgettext:c-format */
384 _bfd_error_handler (_("%pB: invalid relocation type %d"),
388 /* PR 17512: file: 0f67f69d. */
389 if (elf_howto_table [indx].type != r_type)
391 return &elf_howto_table[indx];
395 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
397 Elf_Internal_Rela *dst)
399 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
400 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
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. */
410 elf_i386_is_local_label_name (bfd *abfd, const char *name)
412 if (name[0] == '.' && name[1] == 'X')
415 return _bfd_elf_is_local_label_name (abfd, name);
418 /* Support for core dump NOTE sections. */
421 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
426 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
428 int pr_version = bfd_get_32 (abfd, note->descdata);
434 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
437 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
441 size = bfd_get_32 (abfd, note->descdata + 8);
445 switch (note->descsz)
450 case 144: /* Linux/i386 */
452 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
455 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
465 /* Make a ".reg/999" section. */
466 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
467 size, note->descpos + offset);
471 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
473 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
475 int pr_version = bfd_get_32 (abfd, note->descdata);
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);
487 switch (note->descsz)
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);
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. */
506 char *command = elf_tdata (abfd)->core->command;
507 int n = strlen (command);
509 if (0 < n && command[n - 1] == ' ')
510 command[n - 1] = '\0';
516 /* Functions for the i386 ELF linker.
518 In order to gain some understanding of code in this file without
519 knowing all the intricate details of the linker, note the
522 Functions named elf_i386_* are called by external routines, other
523 functions are only called locally. elf_i386_* functions appear
524 in this file more or less in the order in which they are called
525 from external routines. eg. elf_i386_check_relocs is called
526 early in the link process, elf_i386_finish_dynamic_sections is
527 one of the last functions. */
529 /* The size in bytes of an entry in the lazy procedure linkage table. */
531 #define LAZY_PLT_ENTRY_SIZE 16
533 /* The size in bytes of an entry in the non-lazy procedure linkage
536 #define NON_LAZY_PLT_ENTRY_SIZE 8
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. */
542 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
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. */
550 /* Subsequent entries in an absolute lazy procedure linkage table look
553 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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. */
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. */
567 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
569 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
570 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
573 /* Subsequent entries in a PIC lazy procedure linkage table look like
576 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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. */
586 /* Entries in the non-lazy procedure linkage table look like this. */
588 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
590 0xff, 0x25, /* jmp indirect */
591 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
592 0x66, 0x90 /* xchg %ax,%ax */
595 /* Entries in the PIC non-lazy procedure linkage table look like
598 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
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 */
605 /* The first entry in an absolute IBT-enabled lazy procedure linkage
606 table looks like this. */
608 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
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) */
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. */
619 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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 */
627 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
630 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
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) */
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. */
641 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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) */
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
652 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
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) */
659 /* .eh_frame covering the lazy .plt section. */
661 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
663 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
664 0, 0, 0, 0, /* CIE ID */
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,
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
694 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
696 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
698 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
699 0, 0, 0, 0, /* CIE ID */
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,
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
729 /* .eh_frame covering the non-lazy .plt section. */
731 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
733 #define PLT_GOT_FDE_LENGTH 16
734 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
735 0, 0, 0, 0, /* CIE ID */
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,
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
755 /* These are the standard parameters. */
756 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
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 2, /* plt0_got1_offset */
763 8, /* plt0_got2_offset */
764 0, /* plt0_got2_insn_end */
765 2, /* plt_got_offset */
766 7, /* plt_reloc_offset */
767 12, /* plt_plt_offset */
768 0, /* plt_got_insn_size */
769 0, /* plt_plt_insn_end */
770 6, /* plt_lazy_offset */
771 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
772 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
773 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
774 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
777 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
779 elf_i386_non_lazy_plt_entry, /* plt_entry */
780 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
781 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
782 2, /* plt_got_offset */
783 0, /* plt_got_insn_size */
784 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
785 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
788 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
790 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
791 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
792 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
793 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
794 2, /* plt0_got1_offset */
795 8, /* plt0_got2_offset */
796 0, /* plt0_got2_insn_end */
797 4+2, /* plt_got_offset */
798 4+1, /* plt_reloc_offset */
799 4+6, /* plt_plt_offset */
800 0, /* plt_got_insn_size */
801 0, /* plt_plt_insn_end */
802 0, /* plt_lazy_offset */
803 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
804 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
805 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
806 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
809 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
811 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
812 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
813 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
814 4+2, /* plt_got_offset */
815 0, /* plt_got_insn_size */
816 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
817 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
821 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
822 for the PLTResolve stub and then for each PLT entry. */
823 #define PLTRESOLVE_RELOCS_SHLIB 0
824 #define PLTRESOLVE_RELOCS 2
825 #define PLT_NON_JUMP_SLOT_RELOCS 2
827 /* These are the standard parameters. */
828 static const struct elf_x86_backend_data elf_i386_arch_bed =
833 #define elf_backend_arch_data &elf_i386_arch_bed
835 /* Return TRUE if the TLS access code sequence support transition
839 elf_i386_check_tls_transition (asection *sec,
841 Elf_Internal_Shdr *symtab_hdr,
842 struct elf_link_hash_entry **sym_hashes,
844 const Elf_Internal_Rela *rel,
845 const Elf_Internal_Rela *relend)
847 unsigned int val, type, reg;
848 unsigned long r_symndx;
849 struct elf_link_hash_entry *h;
852 bfd_boolean indirect_call;
854 offset = rel->r_offset;
859 if (offset < 2 || (rel + 1) >= relend)
862 indirect_call = FALSE;
863 call = contents + offset + 4;
866 if (r_type == R_386_TLS_GD)
868 /* Check transition from GD access model. Only
869 leal foo@tlsgd(,%ebx,1), %eax
870 call ___tls_get_addr@PLT
872 leal foo@tlsgd(%ebx) %eax
873 call ___tls_get_addr@PLT
876 leal foo@tlsgd(%reg), %eax
877 call *___tls_get_addr@GOT(%reg)
878 which may be converted to
879 addr32 call ___tls_get_addr
880 can transit to different access model. */
881 if ((offset + 10) > sec->size
882 || (type != 0x8d && type != 0x04))
887 /* leal foo@tlsgd(,%ebx,1), %eax
888 call ___tls_get_addr@PLT */
892 if (*(call - 7) != 0x8d
900 leal foo@tlsgd(%ebx), %eax
901 call ___tls_get_addr@PLT
904 leal foo@tlsgd(%reg), %eax
905 call *___tls_get_addr@GOT(%reg)
906 which may be converted to
907 addr32 call ___tls_get_addr
909 %eax can't be used as the GOT base register since it
910 is used to pass parameter to ___tls_get_addr. */
912 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
915 indirect_call = call[0] == 0xff;
916 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
917 && !(call[0] == 0x67 && call[1] == 0xe8)
919 && (call[1] & 0xf8) == 0x90
920 && (call[1] & 0x7) == reg))
926 /* Check transition from LD access model. Only
927 leal foo@tlsldm(%ebx), %eax
928 call ___tls_get_addr@PLT
930 leal foo@tlsldm(%reg), %eax
931 call *___tls_get_addr@GOT(%reg)
932 which may be converted to
933 addr32 call ___tls_get_addr
934 can transit to different access model. */
935 if (type != 0x8d || (offset + 9) > sec->size)
938 /* %eax can't be used as the GOT base register since it is
939 used to pass parameter to ___tls_get_addr. */
941 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
944 indirect_call = call[0] == 0xff;
945 if (!(reg == 3 && call[0] == 0xe8)
946 && !(call[0] == 0x67 && call[1] == 0xe8)
948 && (call[1] & 0xf8) == 0x90
949 && (call[1] & 0x7) == reg))
953 r_symndx = ELF32_R_SYM (rel[1].r_info);
954 if (r_symndx < symtab_hdr->sh_info)
957 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
959 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
961 else if (indirect_call)
962 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
964 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
965 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
968 /* Check transition from IE access model:
969 movl foo@indntpoff(%rip), %eax
970 movl foo@indntpoff(%rip), %reg
971 addl foo@indntpoff(%rip), %reg
974 if (offset < 1 || (offset + 4) > sec->size)
977 /* Check "movl foo@tpoff(%rip), %eax" first. */
978 val = bfd_get_8 (abfd, contents + offset - 1);
985 /* Check movl|addl foo@tpoff(%rip), %reg. */
986 type = bfd_get_8 (abfd, contents + offset - 2);
987 return ((type == 0x8b || type == 0x03)
988 && (val & 0xc7) == 0x05);
990 case R_386_TLS_GOTIE:
991 case R_386_TLS_IE_32:
992 /* Check transition from {IE_32,GOTIE} access model:
993 subl foo@{tpoff,gontoff}(%reg1), %reg2
994 movl foo@{tpoff,gontoff}(%reg1), %reg2
995 addl foo@{tpoff,gontoff}(%reg1), %reg2
998 if (offset < 2 || (offset + 4) > sec->size)
1001 val = bfd_get_8 (abfd, contents + offset - 1);
1002 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1005 type = bfd_get_8 (abfd, contents + offset - 2);
1006 return type == 0x8b || type == 0x2b || type == 0x03;
1008 case R_386_TLS_GOTDESC:
1009 /* Check transition from GDesc access model:
1010 leal x@tlsdesc(%ebx), %eax
1012 Make sure it's a leal adding ebx to a 32-bit offset
1013 into any register, although it's probably almost always
1016 if (offset < 2 || (offset + 4) > sec->size)
1019 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1022 val = bfd_get_8 (abfd, contents + offset - 1);
1023 return (val & 0xc7) == 0x83;
1025 case R_386_TLS_DESC_CALL:
1026 /* Check transition from GDesc access model:
1027 call *x@tlsdesc(%eax)
1029 if (offset + 2 <= sec->size)
1031 /* Make sure that it's a call *x@tlsdesc(%eax). */
1032 call = contents + offset;
1033 return call[0] == 0xff && call[1] == 0x10;
1043 /* Return TRUE if the TLS access transition is OK or no transition
1044 will be performed. Update R_TYPE if there is a transition. */
1047 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1048 asection *sec, bfd_byte *contents,
1049 Elf_Internal_Shdr *symtab_hdr,
1050 struct elf_link_hash_entry **sym_hashes,
1051 unsigned int *r_type, int tls_type,
1052 const Elf_Internal_Rela *rel,
1053 const Elf_Internal_Rela *relend,
1054 struct elf_link_hash_entry *h,
1055 unsigned long r_symndx,
1056 bfd_boolean from_relocate_section)
1058 unsigned int from_type = *r_type;
1059 unsigned int to_type = from_type;
1060 bfd_boolean check = TRUE;
1062 /* Skip TLS transition for functions. */
1064 && (h->type == STT_FUNC
1065 || h->type == STT_GNU_IFUNC))
1071 case R_386_TLS_GOTDESC:
1072 case R_386_TLS_DESC_CALL:
1073 case R_386_TLS_IE_32:
1075 case R_386_TLS_GOTIE:
1076 if (bfd_link_executable (info))
1079 to_type = R_386_TLS_LE_32;
1080 else if (from_type != R_386_TLS_IE
1081 && from_type != R_386_TLS_GOTIE)
1082 to_type = R_386_TLS_IE_32;
1085 /* When we are called from elf_i386_relocate_section, there may
1086 be additional transitions based on TLS_TYPE. */
1087 if (from_relocate_section)
1089 unsigned int new_to_type = to_type;
1091 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1092 new_to_type = R_386_TLS_LE_32;
1094 if (to_type == R_386_TLS_GD
1095 || to_type == R_386_TLS_GOTDESC
1096 || to_type == R_386_TLS_DESC_CALL)
1098 if (tls_type == GOT_TLS_IE_POS)
1099 new_to_type = R_386_TLS_GOTIE;
1100 else if (tls_type & GOT_TLS_IE)
1101 new_to_type = R_386_TLS_IE_32;
1104 /* We checked the transition before when we were called from
1105 elf_i386_check_relocs. We only want to check the new
1106 transition which hasn't been checked before. */
1107 check = new_to_type != to_type && from_type == to_type;
1108 to_type = new_to_type;
1114 if (bfd_link_executable (info))
1115 to_type = R_386_TLS_LE_32;
1122 /* Return TRUE if there is no transition. */
1123 if (from_type == to_type)
1126 /* Check if the transition can be performed. */
1128 && ! elf_i386_check_tls_transition (sec, contents,
1129 symtab_hdr, sym_hashes,
1130 from_type, rel, relend))
1132 reloc_howto_type *from, *to;
1135 from = elf_i386_rtype_to_howto (abfd, from_type);
1136 to = elf_i386_rtype_to_howto (abfd, to_type);
1139 name = h->root.root.string;
1142 struct elf_x86_link_hash_table *htab;
1144 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1149 Elf_Internal_Sym *isym;
1151 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1153 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1158 /* xgettext:c-format */
1159 (_("%pB: TLS transition from %s to %s against `%s'"
1160 " at %#" PRIx64 " in section `%pA' failed"),
1161 abfd, from->name, to->name, name,
1162 (uint64_t) rel->r_offset, sec);
1163 bfd_set_error (bfd_error_bad_value);
1171 /* With the local symbol, foo, we convert
1172 mov foo@GOT[(%reg1)], %reg2
1174 lea foo[@GOTOFF(%reg1)], %reg2
1176 call/jmp *foo@GOT[(%reg)]
1178 nop call foo/jmp foo nop
1179 When PIC is false, convert
1180 test %reg1, foo@GOT[(%reg2)]
1184 binop foo@GOT[(%reg1)], %reg2
1187 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1192 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1194 unsigned int *r_type_p,
1195 Elf_Internal_Rela *irel,
1196 struct elf_link_hash_entry *h,
1197 bfd_boolean *converted,
1198 struct bfd_link_info *link_info)
1200 struct elf_x86_link_hash_table *htab;
1201 unsigned int opcode;
1203 bfd_boolean baseless;
1204 Elf_Internal_Sym *isym;
1205 unsigned int addend;
1209 bfd_boolean to_reloc_32;
1210 unsigned int r_type;
1211 unsigned int r_symndx;
1212 bfd_vma roff = irel->r_offset;
1213 bfd_boolean local_ref;
1214 struct elf_x86_link_hash_entry *eh;
1219 /* Addend for R_386_GOT32X relocations must be 0. */
1220 addend = bfd_get_32 (abfd, contents + roff);
1224 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1225 is_pic = bfd_link_pic (link_info);
1228 r_symndx = ELF32_R_SYM (irel->r_info);
1230 modrm = bfd_get_8 (abfd, contents + roff - 1);
1231 baseless = (modrm & 0xc7) == 0x5;
1233 if (baseless && is_pic)
1235 /* For PIC, disallow R_386_GOT32X without a base register
1236 since we don't know what the GOT base is. */
1241 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1243 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1246 name = h->root.root.string;
1249 /* xgettext:c-format */
1250 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1251 " register can not be used when making a shared object"),
1256 opcode = bfd_get_8 (abfd, contents + roff - 2);
1258 /* Convert to R_386_32 if PIC is false or there is no base
1260 to_reloc_32 = !is_pic || baseless;
1262 eh = elf_x86_hash_entry (h);
1264 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1268 if (opcode == 0x0ff)
1269 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1270 goto convert_branch;
1272 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1273 "test %reg1, foo@GOT(%reg2)" and
1274 "binop foo@GOT[(%reg1)], %reg2". */
1278 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1279 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1281 /* Undefined weak symbol is only bound locally in executable
1282 and its reference is resolved as 0. */
1283 if (h->root.type == bfd_link_hash_undefweak
1289 /* No direct branch to 0 for PIC. */
1293 goto convert_branch;
1297 /* We can convert load of address 0 to R_386_32. */
1305 /* We have "call/jmp *foo@GOT[(%reg)]". */
1306 if ((h->root.type == bfd_link_hash_defined
1307 || h->root.type == bfd_link_hash_defweak)
1310 /* The function is locally defined. */
1312 /* Convert R_386_GOT32X to R_386_PC32. */
1313 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1315 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1318 /* To support TLS optimization, always use addr32 prefix
1319 for "call *___tls_get_addr@GOT(%reg)". */
1320 if (eh && eh->tls_get_addr)
1323 nop_offset = irel->r_offset - 2;
1327 nop = link_info->call_nop_byte;
1328 if (link_info->call_nop_as_suffix)
1330 nop_offset = roff + 3;
1331 irel->r_offset -= 1;
1334 nop_offset = roff - 2;
1339 /* Convert to "jmp foo nop". */
1342 nop_offset = roff + 3;
1343 irel->r_offset -= 1;
1346 bfd_put_8 (abfd, nop, contents + nop_offset);
1347 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1348 /* When converting to PC-relative relocation, we
1349 need to adjust addend by -4. */
1350 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1351 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1352 *r_type_p = R_386_PC32;
1358 /* We have "mov foo@GOT[(%re1g)], %reg2",
1359 "test %reg1, foo@GOT(%reg2)" and
1360 "binop foo@GOT[(%reg1)], %reg2".
1362 Avoid optimizing _DYNAMIC since ld.so may use its
1363 link-time address. */
1364 if (h == htab->elf.hdynamic)
1367 /* def_regular is set by an assignment in a linker script in
1368 bfd_elf_record_link_assignment. start_stop is set on
1369 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1373 || h->root.type == bfd_link_hash_defined
1374 || h->root.type == bfd_link_hash_defweak)
1382 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1383 "mov $foo, %reg2" with R_386_32. */
1385 modrm = 0xc0 | (modrm & 0x38) >> 3;
1386 bfd_put_8 (abfd, modrm, contents + roff - 1);
1391 /* Convert "mov foo@GOT(%reg1), %reg2" to
1392 "lea foo@GOTOFF(%reg1), %reg2". */
1393 r_type = R_386_GOTOFF;
1399 /* Only R_386_32 is supported. */
1405 /* Convert "test %reg1, foo@GOT(%reg2)" to
1406 "test $foo, %reg1". */
1407 modrm = 0xc0 | (modrm & 0x38) >> 3;
1412 /* Convert "binop foo@GOT(%reg1), %reg2" to
1413 "binop $foo, %reg2". */
1415 | (modrm & 0x38) >> 3
1419 bfd_put_8 (abfd, modrm, contents + roff - 1);
1423 bfd_put_8 (abfd, opcode, contents + roff - 2);
1424 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1433 /* Rename some of the generic section flags to better document how they
1435 #define check_relocs_failed sec_flg0
1437 /* Look through the relocs for a section during the first phase, and
1438 calculate needed space in the global offset table, procedure linkage
1439 table, and dynamic reloc sections. */
1442 elf_i386_check_relocs (bfd *abfd,
1443 struct bfd_link_info *info,
1445 const Elf_Internal_Rela *relocs)
1447 struct elf_x86_link_hash_table *htab;
1448 Elf_Internal_Shdr *symtab_hdr;
1449 struct elf_link_hash_entry **sym_hashes;
1450 const Elf_Internal_Rela *rel;
1451 const Elf_Internal_Rela *rel_end;
1454 bfd_boolean converted;
1456 if (bfd_link_relocatable (info))
1459 /* Don't do anything special with non-loaded, non-alloced sections.
1460 In particular, any relocs in such sections should not affect GOT
1461 and PLT reference counting (ie. we don't allow them to create GOT
1462 or PLT entries), there's no possibility or desire to optimize TLS
1463 relocs, and there's not much point in propagating relocs to shared
1464 libs that the dynamic linker won't relocate. */
1465 if ((sec->flags & SEC_ALLOC) == 0)
1468 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1471 sec->check_relocs_failed = 1;
1475 BFD_ASSERT (is_x86_elf (abfd, htab));
1477 /* Get the section contents. */
1478 if (elf_section_data (sec)->this_hdr.contents != NULL)
1479 contents = elf_section_data (sec)->this_hdr.contents;
1480 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1482 sec->check_relocs_failed = 1;
1486 symtab_hdr = &elf_symtab_hdr (abfd);
1487 sym_hashes = elf_sym_hashes (abfd);
1493 rel_end = relocs + sec->reloc_count;
1494 for (rel = relocs; rel < rel_end; rel++)
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;
1502 bfd_boolean size_reloc;
1504 r_symndx = ELF32_R_SYM (rel->r_info);
1505 r_type = ELF32_R_TYPE (rel->r_info);
1507 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1509 /* xgettext:c-format */
1510 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1515 if (r_symndx < symtab_hdr->sh_info)
1517 /* A local symbol. */
1518 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1523 /* Check relocation against local STT_GNU_IFUNC symbol. */
1524 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1526 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1530 /* Fake a STT_GNU_IFUNC symbol. */
1531 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1533 h->type = STT_GNU_IFUNC;
1536 h->forced_local = 1;
1537 h->root.type = bfd_link_hash_defined;
1545 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1546 while (h->root.type == bfd_link_hash_indirect
1547 || h->root.type == bfd_link_hash_warning)
1548 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1551 eh = (struct elf_x86_link_hash_entry *) h;
1554 if (r_type == R_386_GOTOFF)
1557 /* It is referenced by a non-shared object. */
1560 if (h->type == STT_GNU_IFUNC)
1561 elf_tdata (info->output_bfd)->has_gnu_symbols
1562 |= elf_gnu_symbol_ifunc;
1565 if (r_type == R_386_GOT32X
1566 && (h == NULL || h->type != STT_GNU_IFUNC))
1568 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1569 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1575 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1576 symtab_hdr, sym_hashes,
1577 &r_type, GOT_UNKNOWN,
1578 rel, rel_end, h, r_symndx, FALSE))
1581 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1582 if (h == htab->elf.hgot)
1583 htab->got_referenced = TRUE;
1588 htab->tls_ld_or_ldm_got.refcount = 1;
1592 /* This symbol requires a procedure linkage table entry. We
1593 actually build the entry in adjust_dynamic_symbol,
1594 because this might be a case of linking PIC code which is
1595 never referenced by a dynamic object, in which case we
1596 don't need to generate a procedure linkage table entry
1599 /* If this is a local symbol, we resolve it directly without
1600 creating a procedure linkage table entry. */
1604 eh->zero_undefweak &= 0x2;
1606 h->plt.refcount = 1;
1613 case R_386_TLS_IE_32:
1615 case R_386_TLS_GOTIE:
1616 if (!bfd_link_executable (info))
1617 info->flags |= DF_STATIC_TLS;
1623 case R_386_TLS_GOTDESC:
1624 case R_386_TLS_DESC_CALL:
1625 /* This symbol requires a global offset table entry. */
1627 int tls_type, old_tls_type;
1634 tls_type = GOT_NORMAL;
1636 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1637 case R_386_TLS_GOTDESC:
1638 case R_386_TLS_DESC_CALL:
1639 tls_type = GOT_TLS_GDESC; break;
1640 case R_386_TLS_IE_32:
1641 if (ELF32_R_TYPE (rel->r_info) == r_type)
1642 tls_type = GOT_TLS_IE_NEG;
1644 /* If this is a GD->IE transition, we may use either of
1645 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1646 tls_type = GOT_TLS_IE;
1649 case R_386_TLS_GOTIE:
1650 tls_type = GOT_TLS_IE_POS; break;
1655 h->got.refcount = 1;
1656 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1660 bfd_signed_vma *local_got_refcounts;
1662 /* This is a global offset table entry for a local symbol. */
1663 local_got_refcounts = elf_local_got_refcounts (abfd);
1664 if (local_got_refcounts == NULL)
1668 size = symtab_hdr->sh_info;
1669 size *= (sizeof (bfd_signed_vma)
1670 + sizeof (bfd_vma) + sizeof(char));
1671 local_got_refcounts = (bfd_signed_vma *)
1672 bfd_zalloc (abfd, size);
1673 if (local_got_refcounts == NULL)
1675 elf_local_got_refcounts (abfd) = local_got_refcounts;
1676 elf_x86_local_tlsdesc_gotent (abfd)
1677 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1678 elf_x86_local_got_tls_type (abfd)
1679 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1681 local_got_refcounts[r_symndx] = 1;
1682 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1685 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1686 tls_type |= old_tls_type;
1687 /* If a TLS symbol is accessed using IE at least once,
1688 there is no point to use dynamic model for it. */
1689 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1690 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1691 || (tls_type & GOT_TLS_IE) == 0))
1693 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1694 tls_type = old_tls_type;
1695 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1696 && GOT_TLS_GD_ANY_P (tls_type))
1697 tls_type |= old_tls_type;
1701 name = h->root.root.string;
1703 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1706 /* xgettext:c-format */
1707 (_("%pB: `%s' accessed both as normal and "
1708 "thread local symbol"),
1710 bfd_set_error (bfd_error_bad_value);
1715 if (old_tls_type != tls_type)
1718 elf_x86_hash_entry (h)->tls_type = tls_type;
1720 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1728 if (r_type != R_386_TLS_IE)
1732 eh->zero_undefweak &= 0x2;
1734 /* Need GOT to resolve undefined weak symbol to 0. */
1735 if (r_type == R_386_GOTOFF
1736 && h->root.type == bfd_link_hash_undefweak
1737 && bfd_link_executable (info))
1738 htab->got_referenced = TRUE;
1744 case R_386_TLS_LE_32:
1747 eh->zero_undefweak &= 0x2;
1748 if (bfd_link_executable (info))
1750 info->flags |= DF_STATIC_TLS;
1755 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1756 eh->zero_undefweak |= 0x2;
1758 /* We are called after all symbols have been resolved. Only
1759 relocation against STT_GNU_IFUNC symbol must go through
1762 && (bfd_link_executable (info)
1763 || h->type == STT_GNU_IFUNC))
1765 bfd_boolean func_pointer_ref = FALSE;
1767 if (r_type == R_386_PC32)
1769 /* Since something like ".long foo - ." may be used
1770 as pointer, make sure that PLT is used if foo is
1771 a function defined in a shared library. */
1772 if ((sec->flags & SEC_CODE) == 0)
1773 h->pointer_equality_needed = 1;
1774 else if (h->type == STT_GNU_IFUNC
1775 && bfd_link_pic (info))
1778 /* xgettext:c-format */
1779 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1780 abfd, h->root.root.string);
1781 bfd_set_error (bfd_error_bad_value);
1787 h->pointer_equality_needed = 1;
1788 /* R_386_32 can be resolved at run-time. */
1789 if (r_type == R_386_32
1790 && (sec->flags & SEC_READONLY) == 0)
1791 func_pointer_ref = TRUE;
1794 if (!func_pointer_ref)
1796 /* If this reloc is in a read-only section, we might
1797 need a copy reloc. We can't check reliably at this
1798 stage whether the section is read-only, as input
1799 sections have not yet been mapped to output sections.
1800 Tentatively set the flag for now, and correct in
1801 adjust_dynamic_symbol. */
1804 /* We may need a .plt entry if the symbol is a function
1805 defined in a shared lib or is a function referenced
1806 from the code or read-only section. */
1808 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1809 h->plt.refcount = 1;
1815 if (NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type,
1818 struct elf_dyn_relocs *p;
1819 struct elf_dyn_relocs **head;
1821 /* We must copy these reloc types into the output file.
1822 Create a reloc section in dynobj and make room for
1826 sreloc = _bfd_elf_make_dynamic_reloc_section
1827 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1833 /* If this is a global symbol, we count the number of
1834 relocations we need for this symbol. */
1837 head = &eh->dyn_relocs;
1841 /* Track dynamic relocs needed for local syms too.
1842 We really need local syms available to do this
1847 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1852 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1856 vpp = &elf_section_data (s)->local_dynrel;
1857 head = (struct elf_dyn_relocs **)vpp;
1861 if (p == NULL || p->sec != sec)
1863 bfd_size_type amt = sizeof *p;
1864 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1876 /* Count size relocation as PC-relative relocation. */
1877 if (r_type == R_386_PC32 || size_reloc)
1882 /* This relocation describes the C++ object vtable hierarchy.
1883 Reconstruct it for later use during GC. */
1884 case R_386_GNU_VTINHERIT:
1885 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1889 /* This relocation describes which C++ vtable entries are actually
1890 used. Record for later use during GC. */
1891 case R_386_GNU_VTENTRY:
1892 BFD_ASSERT (h != NULL);
1894 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1903 if (elf_section_data (sec)->this_hdr.contents != contents)
1905 if (!converted && !info->keep_memory)
1909 /* Cache the section contents for elf_link_input_bfd if any
1910 load is converted or --no-keep-memory isn't used. */
1911 elf_section_data (sec)->this_hdr.contents = contents;
1915 /* Cache relocations if any load is converted. */
1916 if (elf_section_data (sec)->relocs != relocs && converted)
1917 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1922 if (elf_section_data (sec)->this_hdr.contents != contents)
1924 sec->check_relocs_failed = 1;
1928 /* Set the correct type for an x86 ELF section. We do this by the
1929 section name, which is a hack, but ought to work. */
1932 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1933 Elf_Internal_Shdr *hdr,
1938 name = bfd_get_section_name (abfd, sec);
1940 /* This is an ugly, but unfortunately necessary hack that is
1941 needed when producing EFI binaries on x86. It tells
1942 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1943 containing ELF relocation info. We need this hack in order to
1944 be able to generate ELF binaries that can be translated into
1945 EFI applications (which are essentially COFF objects). Those
1946 files contain a COFF ".reloc" section inside an ELFNN object,
1947 which would normally cause BFD to segfault because it would
1948 attempt to interpret this section as containing relocation
1949 entries for section "oc". With this hack enabled, ".reloc"
1950 will be treated as a normal data section, which will avoid the
1951 segfault. However, you won't be able to create an ELFNN binary
1952 with a section named "oc" that needs relocations, but that's
1953 the kind of ugly side-effects you get when detecting section
1954 types based on their names... In practice, this limitation is
1955 unlikely to bite. */
1956 if (strcmp (name, ".reloc") == 0)
1957 hdr->sh_type = SHT_PROGBITS;
1962 /* Return the relocation value for @tpoff relocation
1963 if STT_TLS virtual address is ADDRESS. */
1966 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1968 struct elf_link_hash_table *htab = elf_hash_table (info);
1969 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1970 bfd_vma static_tls_size;
1972 /* If tls_sec is NULL, we should have signalled an error already. */
1973 if (htab->tls_sec == NULL)
1976 /* Consider special static TLS alignment requirements. */
1977 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1978 return static_tls_size + htab->tls_sec->vma - address;
1981 /* Relocate an i386 ELF section. */
1984 elf_i386_relocate_section (bfd *output_bfd,
1985 struct bfd_link_info *info,
1987 asection *input_section,
1989 Elf_Internal_Rela *relocs,
1990 Elf_Internal_Sym *local_syms,
1991 asection **local_sections)
1993 struct elf_x86_link_hash_table *htab;
1994 Elf_Internal_Shdr *symtab_hdr;
1995 struct elf_link_hash_entry **sym_hashes;
1996 bfd_vma *local_got_offsets;
1997 bfd_vma *local_tlsdesc_gotents;
1998 Elf_Internal_Rela *rel;
1999 Elf_Internal_Rela *wrel;
2000 Elf_Internal_Rela *relend;
2001 bfd_boolean is_vxworks_tls;
2002 unsigned plt_entry_size;
2004 /* Skip if check_relocs failed. */
2005 if (input_section->check_relocs_failed)
2008 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2012 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2014 symtab_hdr = &elf_symtab_hdr (input_bfd);
2015 sym_hashes = elf_sym_hashes (input_bfd);
2016 local_got_offsets = elf_local_got_offsets (input_bfd);
2017 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2018 /* We have to handle relocations in vxworks .tls_vars sections
2019 specially, because the dynamic loader is 'weird'. */
2020 is_vxworks_tls = (htab->target_os == is_vxworks
2021 && bfd_link_pic (info)
2022 && !strcmp (input_section->output_section->name,
2025 _bfd_x86_elf_set_tls_module_base (info);
2027 plt_entry_size = htab->plt.plt_entry_size;
2029 rel = wrel = relocs;
2030 relend = relocs + input_section->reloc_count;
2031 for (; rel < relend; wrel++, rel++)
2033 unsigned int r_type, r_type_tls;
2034 reloc_howto_type *howto;
2035 unsigned long r_symndx;
2036 struct elf_link_hash_entry *h;
2037 struct elf_x86_link_hash_entry *eh;
2038 Elf_Internal_Sym *sym;
2040 bfd_vma off, offplt, plt_offset;
2042 bfd_boolean unresolved_reloc;
2043 bfd_reloc_status_type r;
2047 asection *resolved_plt;
2048 bfd_boolean resolved_to_zero;
2049 bfd_boolean relative_reloc;
2051 r_type = ELF32_R_TYPE (rel->r_info);
2052 if (r_type == R_386_GNU_VTINHERIT
2053 || r_type == R_386_GNU_VTENTRY)
2060 if ((indx = r_type) >= R_386_standard
2061 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2062 >= R_386_ext - R_386_standard)
2063 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2064 >= R_386_ext2 - R_386_ext))
2065 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2067 howto = elf_howto_table + indx;
2069 r_symndx = ELF32_R_SYM (rel->r_info);
2073 unresolved_reloc = FALSE;
2074 if (r_symndx < symtab_hdr->sh_info)
2076 sym = local_syms + r_symndx;
2077 sec = local_sections[r_symndx];
2078 relocation = (sec->output_section->vma
2079 + sec->output_offset
2081 st_size = sym->st_size;
2083 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2084 && ((sec->flags & SEC_MERGE) != 0
2085 || (bfd_link_relocatable (info)
2086 && sec->output_offset != 0)))
2089 bfd_byte *where = contents + rel->r_offset;
2091 switch (howto->size)
2094 addend = bfd_get_8 (input_bfd, where);
2095 if (howto->pc_relative)
2097 addend = (addend ^ 0x80) - 0x80;
2102 addend = bfd_get_16 (input_bfd, where);
2103 if (howto->pc_relative)
2105 addend = (addend ^ 0x8000) - 0x8000;
2110 addend = bfd_get_32 (input_bfd, where);
2111 if (howto->pc_relative)
2113 addend = (addend ^ 0x80000000) - 0x80000000;
2121 if (bfd_link_relocatable (info))
2122 addend += sec->output_offset;
2125 asection *msec = sec;
2126 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2128 addend -= relocation;
2129 addend += msec->output_section->vma + msec->output_offset;
2132 switch (howto->size)
2135 /* FIXME: overflow checks. */
2136 if (howto->pc_relative)
2138 bfd_put_8 (input_bfd, addend, where);
2141 if (howto->pc_relative)
2143 bfd_put_16 (input_bfd, addend, where);
2146 if (howto->pc_relative)
2148 bfd_put_32 (input_bfd, addend, where);
2152 else if (!bfd_link_relocatable (info)
2153 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2155 /* Relocate against local STT_GNU_IFUNC symbol. */
2156 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2161 /* Set STT_GNU_IFUNC symbol value. */
2162 h->root.u.def.value = sym->st_value;
2163 h->root.u.def.section = sec;
2168 bfd_boolean warned ATTRIBUTE_UNUSED;
2169 bfd_boolean ignored ATTRIBUTE_UNUSED;
2171 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2172 r_symndx, symtab_hdr, sym_hashes,
2174 unresolved_reloc, warned, ignored);
2178 if (sec != NULL && discarded_section (sec))
2180 _bfd_clear_contents (howto, input_bfd, input_section,
2181 contents + rel->r_offset);
2182 wrel->r_offset = rel->r_offset;
2186 /* For ld -r, remove relocations in debug sections against
2187 sections defined in discarded sections. Not done for
2188 eh_frame editing code expects to be present. */
2189 if (bfd_link_relocatable (info)
2190 && (input_section->flags & SEC_DEBUGGING))
2196 if (bfd_link_relocatable (info))
2203 eh = (struct elf_x86_link_hash_entry *) h;
2205 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2206 it here if it is defined in a non-shared object. */
2208 && h->type == STT_GNU_IFUNC
2211 asection *gotplt, *base_got;
2215 if ((input_section->flags & SEC_ALLOC) == 0)
2217 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2218 sections because such sections are not SEC_ALLOC and
2219 thus ld.so will not process them. */
2220 if ((input_section->flags & SEC_DEBUGGING) != 0)
2225 /* STT_GNU_IFUNC symbol must go through PLT. */
2226 if (htab->elf.splt != NULL)
2228 if (htab->plt_second != NULL)
2230 resolved_plt = htab->plt_second;
2231 plt_offset = eh->plt_second.offset;
2235 resolved_plt = htab->elf.splt;
2236 plt_offset = h->plt.offset;
2238 gotplt = htab->elf.sgotplt;
2242 resolved_plt = htab->elf.iplt;
2243 plt_offset = h->plt.offset;
2244 gotplt = htab->elf.igotplt;
2254 base_got = htab->elf.sgot;
2255 off = h->got.offset;
2257 if (base_got == NULL)
2260 if (off == (bfd_vma) -1)
2262 /* We can't use h->got.offset here to save state, or
2263 even just remember the offset, as finish_dynamic_symbol
2264 would use that as offset into .got. */
2266 if (h->plt.offset == (bfd_vma) -1)
2269 if (htab->elf.splt != NULL)
2271 plt_index = (h->plt.offset / plt_entry_size
2272 - htab->plt.has_plt0);
2273 off = (plt_index + 3) * 4;
2274 base_got = htab->elf.sgotplt;
2278 plt_index = h->plt.offset / plt_entry_size;
2279 off = plt_index * 4;
2280 base_got = htab->elf.igotplt;
2283 if (h->dynindx == -1
2287 /* This references the local defitionion. We must
2288 initialize this entry in the global offset table.
2289 Since the offset must always be a multiple of 8,
2290 we use the least significant bit to record
2291 whether we have initialized it already.
2293 When doing a dynamic link, we create a .rela.got
2294 relocation entry to initialize the value. This
2295 is done in the finish_dynamic_symbol routine. */
2300 bfd_put_32 (output_bfd, relocation,
2301 base_got->contents + off);
2309 relocation = (base_got->output_section->vma
2310 + base_got->output_offset + off
2311 - gotplt->output_section->vma
2312 - gotplt->output_offset);
2314 if (rel->r_offset > 1
2315 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2316 && *(contents + rel->r_offset - 2) != 0x8d)
2318 if (bfd_link_pic (info))
2319 goto disallow_got32;
2321 /* Add the GOT base if there is no base register. */
2322 relocation += (gotplt->output_section->vma
2323 + gotplt->output_offset);
2325 else if (htab->elf.splt == NULL)
2327 /* Adjust for static executables. */
2328 relocation += gotplt->output_offset;
2334 if (h->plt.offset == (bfd_vma) -1)
2336 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2337 if (r_type == R_386_32
2338 && (input_section->flags & SEC_CODE) == 0)
2339 goto do_ifunc_pointer;
2340 goto bad_ifunc_reloc;
2343 relocation = (resolved_plt->output_section->vma
2344 + resolved_plt->output_offset + plt_offset);
2350 if (h->root.root.string)
2351 name = h->root.root.string;
2353 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2356 /* xgettext:c-format */
2357 (_("%pB: relocation %s against STT_GNU_IFUNC "
2358 "symbol `%s' isn't supported"), input_bfd,
2360 bfd_set_error (bfd_error_bad_value);
2364 /* Generate dynamic relcoation only when there is a
2365 non-GOT reference in a shared object. */
2366 if ((bfd_link_pic (info) && h->non_got_ref)
2367 || h->plt.offset == (bfd_vma) -1)
2369 Elf_Internal_Rela outrel;
2374 /* Need a dynamic relocation to get the real function
2376 offset = _bfd_elf_section_offset (output_bfd,
2380 if (offset == (bfd_vma) -1
2381 || offset == (bfd_vma) -2)
2384 outrel.r_offset = (input_section->output_section->vma
2385 + input_section->output_offset
2388 if (POINTER_LOCAL_IFUNC_P (info, h))
2390 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2391 h->root.root.string,
2392 h->root.u.def.section->owner);
2394 /* This symbol is resolved locally. */
2395 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2396 bfd_put_32 (output_bfd,
2397 (h->root.u.def.value
2398 + h->root.u.def.section->output_section->vma
2399 + h->root.u.def.section->output_offset),
2403 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2405 /* Dynamic relocations are stored in
2406 1. .rel.ifunc section in PIC object.
2407 2. .rel.got section in dynamic executable.
2408 3. .rel.iplt section in static executable. */
2409 if (bfd_link_pic (info))
2410 sreloc = htab->elf.irelifunc;
2411 else if (htab->elf.splt != NULL)
2412 sreloc = htab->elf.srelgot;
2414 sreloc = htab->elf.irelplt;
2415 elf_append_rel (output_bfd, sreloc, &outrel);
2417 /* If this reloc is against an external symbol, we
2418 do not want to fiddle with the addend. Otherwise,
2419 we need to include the symbol value so that it
2420 becomes an addend for the dynamic reloc. For an
2421 internal symbol, we have updated addend. */
2430 relocation -= (gotplt->output_section->vma
2431 + gotplt->output_offset);
2436 resolved_to_zero = (eh != NULL
2437 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2442 /* Avoid optimizing _DYNAMIC since ld.so may use its
2443 link-time address. */
2444 if (h == htab->elf.hdynamic)
2447 if (bfd_link_pic (info))
2449 /* It is OK to convert mov to lea and convert indirect
2450 branch to direct branch. It is OK to convert adc,
2451 add, and, cmp, or, sbb, sub, test, xor only when PIC
2453 unsigned int opcode, addend;
2454 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2457 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2458 if (opcode != 0x8b && opcode != 0xff)
2462 /* Resolve "mov GOT[(%reg)], %reg",
2463 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2464 and "binop foo@GOT[(%reg)], %reg". */
2466 || (h->plt.offset == (bfd_vma) -1
2467 && h->got.offset == (bfd_vma) -1)
2468 || htab->elf.sgotplt == NULL)
2471 offplt = (htab->elf.sgotplt->output_section->vma
2472 + htab->elf.sgotplt->output_offset);
2474 /* It is relative to .got.plt section. */
2475 if (h->got.offset != (bfd_vma) -1)
2476 /* Use GOT entry. Mask off the least significant bit in
2477 GOT offset which may be set by R_386_GOT32 processing
2479 relocation = (htab->elf.sgot->output_section->vma
2480 + htab->elf.sgot->output_offset
2481 + (h->got.offset & ~1) - offplt);
2483 /* Use GOTPLT entry. */
2484 relocation = (h->plt.offset / plt_entry_size
2485 - htab->plt.has_plt0 + 3) * 4;
2487 if (!bfd_link_pic (info))
2489 /* If not PIC, add the .got.plt section address for
2490 baseless addressing. */
2492 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2493 if ((modrm & 0xc7) == 0x5)
2494 relocation += offplt;
2497 unresolved_reloc = FALSE;
2502 /* Relocation is to the entry for this symbol in the global
2504 if (htab->elf.sgot == NULL)
2507 relative_reloc = FALSE;
2510 off = h->got.offset;
2511 if (RESOLVED_LOCALLY_P (info, h, htab))
2513 /* We must initialize this entry in the global offset
2514 table. Since the offset must always be a multiple
2515 of 4, we use the least significant bit to record
2516 whether we have initialized it already.
2518 When doing a dynamic link, we create a .rel.got
2519 relocation entry to initialize the value. This
2520 is done in the finish_dynamic_symbol routine. */
2525 bfd_put_32 (output_bfd, relocation,
2526 htab->elf.sgot->contents + off);
2529 if (GENERATE_RELATIVE_RELOC_P (info, h))
2531 /* PR ld/21402: If this symbol isn't dynamic
2532 in PIC, generate R_386_RELATIVE here. */
2533 eh->no_finish_dynamic_symbol = 1;
2534 relative_reloc = TRUE;
2539 unresolved_reloc = FALSE;
2543 if (local_got_offsets == NULL)
2546 off = local_got_offsets[r_symndx];
2548 /* The offset must always be a multiple of 4. We use
2549 the least significant bit to record whether we have
2550 already generated the necessary reloc. */
2555 bfd_put_32 (output_bfd, relocation,
2556 htab->elf.sgot->contents + off);
2557 local_got_offsets[r_symndx] |= 1;
2559 if (bfd_link_pic (info))
2560 relative_reloc = TRUE;
2567 Elf_Internal_Rela outrel;
2569 s = htab->elf.srelgot;
2573 outrel.r_offset = (htab->elf.sgot->output_section->vma
2574 + htab->elf.sgot->output_offset
2576 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2577 elf_append_rel (output_bfd, s, &outrel);
2580 if (off >= (bfd_vma) -2)
2583 relocation = (htab->elf.sgot->output_section->vma
2584 + htab->elf.sgot->output_offset + off);
2585 if (rel->r_offset > 1
2586 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2587 && *(contents + rel->r_offset - 2) != 0x8d)
2589 if (bfd_link_pic (info))
2591 /* For PIC, disallow R_386_GOT32 without a base
2592 register, except for "lea foo@GOT, %reg", since
2593 we don't know what the GOT base is. */
2597 if (h == NULL || h->root.root.string == NULL)
2598 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2601 name = h->root.root.string;
2604 /* xgettext:c-format */
2605 (_("%pB: direct GOT relocation %s against `%s'"
2606 " without base register can not be used"
2607 " when making a shared object"),
2608 input_bfd, howto->name, name);
2609 bfd_set_error (bfd_error_bad_value);
2615 /* Subtract the .got.plt section address only with a base
2617 relocation -= (htab->elf.sgotplt->output_section->vma
2618 + htab->elf.sgotplt->output_offset);
2624 /* Relocation is relative to the start of the global offset
2627 /* Check to make sure it isn't a protected function or data
2628 symbol for shared library since it may not be local when
2629 used as function address or with copy relocation. We also
2630 need to make sure that a symbol is referenced locally. */
2631 if (!bfd_link_executable (info) && h)
2633 if (!h->def_regular)
2637 switch (ELF_ST_VISIBILITY (h->other))
2640 v = _("hidden symbol");
2643 v = _("internal symbol");
2646 v = _("protected symbol");
2654 /* xgettext:c-format */
2655 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2656 " `%s' can not be used when making a shared object"),
2657 input_bfd, v, h->root.root.string);
2658 bfd_set_error (bfd_error_bad_value);
2661 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2662 && (h->type == STT_FUNC
2663 || h->type == STT_OBJECT)
2664 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2667 /* xgettext:c-format */
2668 (_("%pB: relocation R_386_GOTOFF against protected %s"
2669 " `%s' can not be used when making a shared object"),
2671 h->type == STT_FUNC ? "function" : "data",
2672 h->root.root.string);
2673 bfd_set_error (bfd_error_bad_value);
2678 /* Note that sgot is not involved in this
2679 calculation. We always want the start of .got.plt. If we
2680 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2681 permitted by the ABI, we might have to change this
2683 relocation -= htab->elf.sgotplt->output_section->vma
2684 + htab->elf.sgotplt->output_offset;
2688 /* Use global offset table as symbol value. */
2689 relocation = htab->elf.sgotplt->output_section->vma
2690 + htab->elf.sgotplt->output_offset;
2691 unresolved_reloc = FALSE;
2695 /* Relocation is to the entry for this symbol in the
2696 procedure linkage table. */
2698 /* Resolve a PLT32 reloc against a local symbol directly,
2699 without using the procedure linkage table. */
2703 if ((h->plt.offset == (bfd_vma) -1
2704 && eh->plt_got.offset == (bfd_vma) -1)
2705 || htab->elf.splt == NULL)
2707 /* We didn't make a PLT entry for this symbol. This
2708 happens when statically linking PIC code, or when
2709 using -Bsymbolic. */
2713 if (h->plt.offset != (bfd_vma) -1)
2715 if (htab->plt_second != NULL)
2717 resolved_plt = htab->plt_second;
2718 plt_offset = eh->plt_second.offset;
2722 resolved_plt = htab->elf.splt;
2723 plt_offset = h->plt.offset;
2728 resolved_plt = htab->plt_got;
2729 plt_offset = eh->plt_got.offset;
2732 relocation = (resolved_plt->output_section->vma
2733 + resolved_plt->output_offset
2735 unresolved_reloc = FALSE;
2739 /* Set to symbol size. */
2740 relocation = st_size;
2745 if ((input_section->flags & SEC_ALLOC) == 0
2749 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2750 FALSE, resolved_to_zero,
2751 (r_type == R_386_PC32)))
2753 Elf_Internal_Rela outrel;
2754 bfd_boolean skip, relocate;
2757 /* When generating a shared object, these relocations
2758 are copied into the output file to be resolved at run
2765 _bfd_elf_section_offset (output_bfd, info, input_section,
2767 if (outrel.r_offset == (bfd_vma) -1)
2769 else if (outrel.r_offset == (bfd_vma) -2)
2770 skip = TRUE, relocate = TRUE;
2771 outrel.r_offset += (input_section->output_section->vma
2772 + input_section->output_offset);
2775 memset (&outrel, 0, sizeof outrel);
2776 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2777 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2780 /* This symbol is local, or marked to become local. */
2782 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2785 sreloc = elf_section_data (input_section)->sreloc;
2787 if (sreloc == NULL || sreloc->contents == NULL)
2789 r = bfd_reloc_notsupported;
2790 goto check_relocation_error;
2793 elf_append_rel (output_bfd, sreloc, &outrel);
2795 /* If this reloc is against an external symbol, we do
2796 not want to fiddle with the addend. Otherwise, we
2797 need to include the symbol value so that it becomes
2798 an addend for the dynamic reloc. */
2805 if (!bfd_link_executable (info))
2807 Elf_Internal_Rela outrel;
2810 outrel.r_offset = rel->r_offset
2811 + input_section->output_section->vma
2812 + input_section->output_offset;
2813 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2814 sreloc = elf_section_data (input_section)->sreloc;
2817 elf_append_rel (output_bfd, sreloc, &outrel);
2822 case R_386_TLS_GOTDESC:
2823 case R_386_TLS_DESC_CALL:
2824 case R_386_TLS_IE_32:
2825 case R_386_TLS_GOTIE:
2826 tls_type = GOT_UNKNOWN;
2827 if (h == NULL && local_got_offsets)
2828 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2830 tls_type = elf_x86_hash_entry(h)->tls_type;
2831 if (tls_type == GOT_TLS_IE)
2832 tls_type = GOT_TLS_IE_NEG;
2834 r_type_tls = r_type;
2835 if (! elf_i386_tls_transition (info, input_bfd,
2836 input_section, contents,
2837 symtab_hdr, sym_hashes,
2838 &r_type_tls, tls_type, rel,
2839 relend, h, r_symndx, TRUE))
2842 if (r_type_tls == R_386_TLS_LE_32)
2844 BFD_ASSERT (! unresolved_reloc);
2845 if (r_type == R_386_TLS_GD)
2850 /* GD->LE transition. */
2851 type = *(contents + rel->r_offset - 2);
2855 leal foo@tlsgd(,%ebx,1), %eax
2856 call ___tls_get_addr@PLT
2859 subl $foo@tpoff, %eax
2860 (6 byte form of subl). */
2861 roff = rel->r_offset + 5;
2866 leal foo@tlsgd(%ebx), %eax
2867 call ___tls_get_addr@PLT
2870 leal foo@tlsgd(%reg), %eax
2871 call *___tls_get_addr@GOT(%reg)
2872 which may be converted to
2873 addr32 call ___tls_get_addr
2875 movl %gs:0, %eax; subl $foo@tpoff, %eax
2876 (6 byte form of subl). */
2877 roff = rel->r_offset + 6;
2879 memcpy (contents + roff - 8,
2880 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2881 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2883 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2888 else if (r_type == R_386_TLS_GOTDESC)
2890 /* GDesc -> LE transition.
2891 It's originally something like:
2892 leal x@tlsdesc(%ebx), %eax
2896 Registers other than %eax may be set up here. */
2901 roff = rel->r_offset;
2902 val = bfd_get_8 (input_bfd, contents + roff - 1);
2904 /* Now modify the instruction as appropriate. */
2905 /* aoliva FIXME: remove the above and xor the byte
2907 bfd_put_8 (output_bfd, val ^ 0x86,
2908 contents + roff - 1);
2909 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2913 else if (r_type == R_386_TLS_DESC_CALL)
2915 /* GDesc -> LE transition.
2923 roff = rel->r_offset;
2924 bfd_put_8 (output_bfd, 0x66, contents + roff);
2925 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2928 else if (r_type == R_386_TLS_IE)
2932 /* IE->LE transition:
2933 Originally it can be one of:
2941 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2944 /* movl foo, %eax. */
2945 bfd_put_8 (output_bfd, 0xb8,
2946 contents + rel->r_offset - 1);
2952 type = bfd_get_8 (input_bfd,
2953 contents + rel->r_offset - 2);
2958 bfd_put_8 (output_bfd, 0xc7,
2959 contents + rel->r_offset - 2);
2960 bfd_put_8 (output_bfd,
2961 0xc0 | ((val >> 3) & 7),
2962 contents + rel->r_offset - 1);
2966 bfd_put_8 (output_bfd, 0x81,
2967 contents + rel->r_offset - 2);
2968 bfd_put_8 (output_bfd,
2969 0xc0 | ((val >> 3) & 7),
2970 contents + rel->r_offset - 1);
2977 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2978 contents + rel->r_offset);
2983 unsigned int val, type;
2985 /* {IE_32,GOTIE}->LE transition:
2986 Originally it can be one of:
2987 subl foo(%reg1), %reg2
2988 movl foo(%reg1), %reg2
2989 addl foo(%reg1), %reg2
2992 movl $foo, %reg2 (6 byte form)
2993 addl $foo, %reg2. */
2994 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2995 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2999 bfd_put_8 (output_bfd, 0xc7,
3000 contents + rel->r_offset - 2);
3001 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3002 contents + rel->r_offset - 1);
3004 else if (type == 0x2b)
3007 bfd_put_8 (output_bfd, 0x81,
3008 contents + rel->r_offset - 2);
3009 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3010 contents + rel->r_offset - 1);
3012 else if (type == 0x03)
3015 bfd_put_8 (output_bfd, 0x81,
3016 contents + rel->r_offset - 2);
3017 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3018 contents + rel->r_offset - 1);
3022 if (r_type == R_386_TLS_GOTIE)
3023 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3024 contents + rel->r_offset);
3026 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3027 contents + rel->r_offset);
3032 if (htab->elf.sgot == NULL)
3037 off = h->got.offset;
3038 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3042 if (local_got_offsets == NULL)
3045 off = local_got_offsets[r_symndx];
3046 offplt = local_tlsdesc_gotents[r_symndx];
3053 Elf_Internal_Rela outrel;
3057 if (htab->elf.srelgot == NULL)
3060 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3062 if (GOT_TLS_GDESC_P (tls_type))
3065 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3066 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3067 <= htab->elf.sgotplt->size);
3068 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3069 + htab->elf.sgotplt->output_offset
3071 + htab->sgotplt_jump_table_size);
3072 sreloc = htab->elf.srelplt;
3073 loc = sreloc->contents;
3074 loc += (htab->next_tls_desc_index++
3075 * sizeof (Elf32_External_Rel));
3076 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3077 <= sreloc->contents + sreloc->size);
3078 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3081 BFD_ASSERT (! unresolved_reloc);
3082 bfd_put_32 (output_bfd,
3083 relocation - _bfd_x86_elf_dtpoff_base (info),
3084 htab->elf.sgotplt->contents + offplt
3085 + htab->sgotplt_jump_table_size + 4);
3089 bfd_put_32 (output_bfd, 0,
3090 htab->elf.sgotplt->contents + offplt
3091 + htab->sgotplt_jump_table_size + 4);
3095 sreloc = htab->elf.srelgot;
3097 outrel.r_offset = (htab->elf.sgot->output_section->vma
3098 + htab->elf.sgot->output_offset + off);
3100 if (GOT_TLS_GD_P (tls_type))
3101 dr_type = R_386_TLS_DTPMOD32;
3102 else if (GOT_TLS_GDESC_P (tls_type))
3104 else if (tls_type == GOT_TLS_IE_POS)
3105 dr_type = R_386_TLS_TPOFF;
3107 dr_type = R_386_TLS_TPOFF32;
3109 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3110 bfd_put_32 (output_bfd,
3111 relocation - _bfd_x86_elf_dtpoff_base (info),
3112 htab->elf.sgot->contents + off);
3113 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3114 bfd_put_32 (output_bfd,
3115 _bfd_x86_elf_dtpoff_base (info) - relocation,
3116 htab->elf.sgot->contents + off);
3117 else if (dr_type != R_386_TLS_DESC)
3118 bfd_put_32 (output_bfd, 0,
3119 htab->elf.sgot->contents + off);
3120 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3122 elf_append_rel (output_bfd, sreloc, &outrel);
3124 if (GOT_TLS_GD_P (tls_type))
3128 BFD_ASSERT (! unresolved_reloc);
3129 bfd_put_32 (output_bfd,
3130 relocation - _bfd_x86_elf_dtpoff_base (info),
3131 htab->elf.sgot->contents + off + 4);
3135 bfd_put_32 (output_bfd, 0,
3136 htab->elf.sgot->contents + off + 4);
3137 outrel.r_info = ELF32_R_INFO (indx,
3138 R_386_TLS_DTPOFF32);
3139 outrel.r_offset += 4;
3140 elf_append_rel (output_bfd, sreloc, &outrel);
3143 else if (tls_type == GOT_TLS_IE_BOTH)
3145 bfd_put_32 (output_bfd,
3147 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3149 htab->elf.sgot->contents + off + 4);
3150 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3151 outrel.r_offset += 4;
3152 elf_append_rel (output_bfd, sreloc, &outrel);
3159 local_got_offsets[r_symndx] |= 1;
3162 if (off >= (bfd_vma) -2
3163 && ! GOT_TLS_GDESC_P (tls_type))
3165 if (r_type_tls == R_386_TLS_GOTDESC
3166 || r_type_tls == R_386_TLS_DESC_CALL)
3168 relocation = htab->sgotplt_jump_table_size + offplt;
3169 unresolved_reloc = FALSE;
3171 else if (r_type_tls == r_type)
3173 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3174 + htab->elf.sgotplt->output_offset;
3175 relocation = htab->elf.sgot->output_section->vma
3176 + htab->elf.sgot->output_offset + off - g_o_t;
3177 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3178 && tls_type == GOT_TLS_IE_BOTH)
3180 if (r_type == R_386_TLS_IE)
3181 relocation += g_o_t;
3182 unresolved_reloc = FALSE;
3184 else if (r_type == R_386_TLS_GD)
3186 unsigned int val, type;
3189 /* GD->IE transition. */
3190 type = *(contents + rel->r_offset - 2);
3191 val = *(contents + rel->r_offset - 1);
3195 leal foo@tlsgd(,%ebx,1), %eax
3196 call ___tls_get_addr@PLT
3199 subl $foo@gottpoff(%ebx), %eax. */
3201 roff = rel->r_offset - 3;
3206 leal foo@tlsgd(%ebx), %eax
3207 call ___tls_get_addr@PLT
3210 leal foo@tlsgd(%reg), %eax
3211 call *___tls_get_addr@GOT(%reg)
3212 which may be converted to
3213 addr32 call ___tls_get_addr
3216 subl $foo@gottpoff(%reg), %eax. */
3217 roff = rel->r_offset - 2;
3219 memcpy (contents + roff,
3220 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3221 contents[roff + 7] = 0x80 | (val & 7);
3222 /* If foo is used only with foo@gotntpoff(%reg) and
3223 foo@indntpoff, but not with foo@gottpoff(%reg), change
3224 subl $foo@gottpoff(%reg), %eax
3226 addl $foo@gotntpoff(%reg), %eax. */
3227 if (tls_type == GOT_TLS_IE_POS)
3228 contents[roff + 6] = 0x03;
3229 bfd_put_32 (output_bfd,
3230 htab->elf.sgot->output_section->vma
3231 + htab->elf.sgot->output_offset + off
3232 - htab->elf.sgotplt->output_section->vma
3233 - htab->elf.sgotplt->output_offset,
3234 contents + roff + 8);
3235 /* Skip R_386_PLT32 and R_386_GOT32X. */
3240 else if (r_type == R_386_TLS_GOTDESC)
3242 /* GDesc -> IE transition.
3243 It's originally something like:
3244 leal x@tlsdesc(%ebx), %eax
3247 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3249 movl x@gottpoff(%ebx), %eax # before negl %eax
3251 Registers other than %eax may be set up here. */
3255 /* First, make sure it's a leal adding ebx to a 32-bit
3256 offset into any register, although it's probably
3257 almost always going to be eax. */
3258 roff = rel->r_offset;
3260 /* Now modify the instruction as appropriate. */
3261 /* To turn a leal into a movl in the form we use it, it
3262 suffices to change the first byte from 0x8d to 0x8b.
3263 aoliva FIXME: should we decide to keep the leal, all
3264 we have to do is remove the statement below, and
3265 adjust the relaxation of R_386_TLS_DESC_CALL. */
3266 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3268 if (tls_type == GOT_TLS_IE_BOTH)
3271 bfd_put_32 (output_bfd,
3272 htab->elf.sgot->output_section->vma
3273 + htab->elf.sgot->output_offset + off
3274 - htab->elf.sgotplt->output_section->vma
3275 - htab->elf.sgotplt->output_offset,
3279 else if (r_type == R_386_TLS_DESC_CALL)
3281 /* GDesc -> IE transition.
3289 depending on how we transformed the TLS_GOTDESC above.
3294 roff = rel->r_offset;
3296 /* Now modify the instruction as appropriate. */
3297 if (tls_type != GOT_TLS_IE_NEG)
3300 bfd_put_8 (output_bfd, 0x66, contents + roff);
3301 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3306 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3307 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3317 if (! elf_i386_tls_transition (info, input_bfd,
3318 input_section, contents,
3319 symtab_hdr, sym_hashes,
3320 &r_type, GOT_UNKNOWN, rel,
3321 relend, h, r_symndx, TRUE))
3324 if (r_type != R_386_TLS_LDM)
3326 /* LD->LE transition. Change
3327 leal foo@tlsldm(%ebx) %eax
3328 call ___tls_get_addr@PLT
3332 leal 0(%esi,1), %esi
3334 leal foo@tlsldm(%reg) %eax
3335 call *___tls_get_addr@GOT(%reg)
3336 which may be converted to
3337 addr32 call ___tls_get_addr
3340 leal 0(%esi), %esi */
3341 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3342 if (*(contents + rel->r_offset + 4) == 0xff
3343 || *(contents + rel->r_offset + 4) == 0x67)
3344 memcpy (contents + rel->r_offset - 2,
3345 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3347 memcpy (contents + rel->r_offset - 2,
3348 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3349 /* Skip R_386_PC32/R_386_PLT32. */
3355 if (htab->elf.sgot == NULL)
3358 off = htab->tls_ld_or_ldm_got.offset;
3363 Elf_Internal_Rela outrel;
3365 if (htab->elf.srelgot == NULL)
3368 outrel.r_offset = (htab->elf.sgot->output_section->vma
3369 + htab->elf.sgot->output_offset + off);
3371 bfd_put_32 (output_bfd, 0,
3372 htab->elf.sgot->contents + off);
3373 bfd_put_32 (output_bfd, 0,
3374 htab->elf.sgot->contents + off + 4);
3375 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3376 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3377 htab->tls_ld_or_ldm_got.offset |= 1;
3379 relocation = htab->elf.sgot->output_section->vma
3380 + htab->elf.sgot->output_offset + off
3381 - htab->elf.sgotplt->output_section->vma
3382 - htab->elf.sgotplt->output_offset;
3383 unresolved_reloc = FALSE;
3386 case R_386_TLS_LDO_32:
3387 if (!bfd_link_executable (info)
3388 || (input_section->flags & SEC_CODE) == 0)
3389 relocation -= _bfd_x86_elf_dtpoff_base (info);
3391 /* When converting LDO to LE, we must negate. */
3392 relocation = -elf_i386_tpoff (info, relocation);
3395 case R_386_TLS_LE_32:
3397 if (!bfd_link_executable (info))
3399 Elf_Internal_Rela outrel;
3402 outrel.r_offset = rel->r_offset
3403 + input_section->output_section->vma
3404 + input_section->output_offset;
3405 if (h != NULL && h->dynindx != -1)
3409 if (r_type == R_386_TLS_LE_32)
3410 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3412 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3413 sreloc = elf_section_data (input_section)->sreloc;
3416 elf_append_rel (output_bfd, sreloc, &outrel);
3419 else if (r_type == R_386_TLS_LE_32)
3420 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3422 relocation -= _bfd_x86_elf_dtpoff_base (info);
3424 else if (r_type == R_386_TLS_LE_32)
3425 relocation = elf_i386_tpoff (info, relocation);
3427 relocation = -elf_i386_tpoff (info, relocation);
3434 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3435 because such sections are not SEC_ALLOC and thus ld.so will
3436 not process them. */
3437 if (unresolved_reloc
3438 && !((input_section->flags & SEC_DEBUGGING) != 0
3440 && _bfd_elf_section_offset (output_bfd, info, input_section,
3441 rel->r_offset) != (bfd_vma) -1)
3444 /* xgettext:c-format */
3445 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3448 (uint64_t) rel->r_offset,
3450 h->root.root.string);
3455 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3456 contents, rel->r_offset,
3459 check_relocation_error:
3460 if (r != bfd_reloc_ok)
3465 name = h->root.root.string;
3468 name = bfd_elf_string_from_elf_section (input_bfd,
3469 symtab_hdr->sh_link,
3474 name = bfd_section_name (input_bfd, sec);
3477 if (r == bfd_reloc_overflow)
3478 (*info->callbacks->reloc_overflow)
3479 (info, (h ? &h->root : NULL), name, howto->name,
3480 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3484 /* xgettext:c-format */
3485 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3486 input_bfd, input_section,
3487 (uint64_t) rel->r_offset, name, (int) r);
3498 Elf_Internal_Shdr *rel_hdr;
3499 size_t deleted = rel - wrel;
3501 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3502 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3503 if (rel_hdr->sh_size == 0)
3505 /* It is too late to remove an empty reloc section. Leave
3507 ??? What is wrong with an empty section??? */
3508 rel_hdr->sh_size = rel_hdr->sh_entsize;
3511 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3512 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3513 input_section->reloc_count -= deleted;
3519 /* Finish up dynamic symbol handling. We set the contents of various
3520 dynamic sections here. */
3523 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3524 struct bfd_link_info *info,
3525 struct elf_link_hash_entry *h,
3526 Elf_Internal_Sym *sym)
3528 struct elf_x86_link_hash_table *htab;
3529 unsigned plt_entry_size;
3530 struct elf_x86_link_hash_entry *eh;
3531 bfd_boolean local_undefweak;
3532 bfd_boolean use_plt_second;
3534 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3538 plt_entry_size = htab->plt.plt_entry_size;
3540 /* Use the second PLT section only if there is .plt section. */
3541 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3543 eh = (struct elf_x86_link_hash_entry *) h;
3544 if (eh->no_finish_dynamic_symbol)
3547 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3548 resolved undefined weak symbols in executable so that their
3549 references have value 0 at run-time. */
3550 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3552 if (h->plt.offset != (bfd_vma) -1)
3554 bfd_vma plt_index, plt_offset;
3556 Elf_Internal_Rela rel;
3558 asection *plt, *resolved_plt, *gotplt, *relplt;
3560 /* When building a static executable, use .iplt, .igot.plt and
3561 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3562 if (htab->elf.splt != NULL)
3564 plt = htab->elf.splt;
3565 gotplt = htab->elf.sgotplt;
3566 relplt = htab->elf.srelplt;
3570 plt = htab->elf.iplt;
3571 gotplt = htab->elf.igotplt;
3572 relplt = htab->elf.irelplt;
3575 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3577 /* Get the index in the procedure linkage table which
3578 corresponds to this symbol. This is the index of this symbol
3579 in all the symbols for which we are making plt entries. The
3580 first entry in the procedure linkage table is reserved.
3582 Get the offset into the .got table of the entry that
3583 corresponds to this function. Each .got entry is 4 bytes.
3584 The first three are reserved.
3586 For static executables, we don't reserve anything. */
3588 if (plt == htab->elf.splt)
3590 got_offset = (h->plt.offset / plt_entry_size
3591 - htab->plt.has_plt0);
3592 got_offset = (got_offset + 3) * 4;
3596 got_offset = h->plt.offset / plt_entry_size;
3597 got_offset = got_offset * 4;
3600 /* Fill in the entry in the procedure linkage table and update
3602 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3607 const bfd_byte *plt_entry;
3608 if (bfd_link_pic (info))
3609 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3611 plt_entry = htab->non_lazy_plt->plt_entry;
3612 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3613 plt_entry, htab->non_lazy_plt->plt_entry_size);
3615 resolved_plt = htab->plt_second;
3616 plt_offset = eh->plt_second.offset;
3621 plt_offset = h->plt.offset;
3624 if (! bfd_link_pic (info))
3626 bfd_put_32 (output_bfd,
3627 (gotplt->output_section->vma
3628 + gotplt->output_offset
3630 resolved_plt->contents + plt_offset
3631 + htab->plt.plt_got_offset);
3633 if (htab->target_os == is_vxworks)
3635 int s, k, reloc_index;
3637 /* Create the R_386_32 relocation referencing the GOT
3638 for this PLT entry. */
3640 /* S: Current slot number (zero-based). */
3641 s = ((h->plt.offset - htab->plt.plt_entry_size)
3642 / htab->plt.plt_entry_size);
3643 /* K: Number of relocations for PLTResolve. */
3644 if (bfd_link_pic (info))
3645 k = PLTRESOLVE_RELOCS_SHLIB;
3647 k = PLTRESOLVE_RELOCS;
3648 /* Skip the PLTresolve relocations, and the relocations for
3649 the other PLT slots. */
3650 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3651 loc = (htab->srelplt2->contents + reloc_index
3652 * sizeof (Elf32_External_Rel));
3654 rel.r_offset = (plt->output_section->vma
3655 + plt->output_offset
3656 + h->plt.offset + 2),
3657 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3658 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3660 /* Create the R_386_32 relocation referencing the beginning of
3661 the PLT for this GOT entry. */
3662 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3663 + htab->elf.sgotplt->output_offset
3665 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3666 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3667 loc + sizeof (Elf32_External_Rel));
3672 bfd_put_32 (output_bfd, got_offset,
3673 resolved_plt->contents + plt_offset
3674 + htab->plt.plt_got_offset);
3677 /* Fill in the entry in the global offset table. Leave the entry
3678 as zero for undefined weak symbol in PIE. No PLT relocation
3679 against undefined weak symbol in PIE. */
3680 if (!local_undefweak)
3682 if (htab->plt.has_plt0)
3683 bfd_put_32 (output_bfd,
3684 (plt->output_section->vma
3685 + plt->output_offset
3687 + htab->lazy_plt->plt_lazy_offset),
3688 gotplt->contents + got_offset);
3690 /* Fill in the entry in the .rel.plt section. */
3691 rel.r_offset = (gotplt->output_section->vma
3692 + gotplt->output_offset
3694 if (PLT_LOCAL_IFUNC_P (info, h))
3696 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3697 h->root.root.string,
3698 h->root.u.def.section->owner);
3700 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3701 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3702 in the .got.plt section. */
3703 bfd_put_32 (output_bfd,
3704 (h->root.u.def.value
3705 + h->root.u.def.section->output_section->vma
3706 + h->root.u.def.section->output_offset),
3707 gotplt->contents + got_offset);
3708 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3709 /* R_386_IRELATIVE comes last. */
3710 plt_index = htab->next_irelative_index--;
3714 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3715 plt_index = htab->next_jump_slot_index++;
3718 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3719 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3721 /* Don't fill the second and third slots in PLT entry for
3722 static executables nor without PLT0. */
3723 if (plt == htab->elf.splt && htab->plt.has_plt0)
3725 bfd_put_32 (output_bfd,
3726 plt_index * sizeof (Elf32_External_Rel),
3727 plt->contents + h->plt.offset
3728 + htab->lazy_plt->plt_reloc_offset);
3729 bfd_put_32 (output_bfd,
3731 + htab->lazy_plt->plt_plt_offset + 4),
3732 (plt->contents + h->plt.offset
3733 + htab->lazy_plt->plt_plt_offset));
3737 else if (eh->plt_got.offset != (bfd_vma) -1)
3739 bfd_vma got_offset, plt_offset;
3740 asection *plt, *got, *gotplt;
3741 const bfd_byte *got_plt_entry;
3743 /* Set the entry in the GOT procedure linkage table. */
3744 plt = htab->plt_got;
3745 got = htab->elf.sgot;
3746 gotplt = htab->elf.sgotplt;
3747 got_offset = h->got.offset;
3749 if (got_offset == (bfd_vma) -1
3755 /* Fill in the entry in the GOT procedure linkage table. */
3756 if (! bfd_link_pic (info))
3758 got_plt_entry = htab->non_lazy_plt->plt_entry;
3759 got_offset += got->output_section->vma + got->output_offset;
3763 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3764 got_offset += (got->output_section->vma
3765 + got->output_offset
3766 - gotplt->output_section->vma
3767 - gotplt->output_offset);
3770 plt_offset = eh->plt_got.offset;
3771 memcpy (plt->contents + plt_offset, got_plt_entry,
3772 htab->non_lazy_plt->plt_entry_size);
3773 bfd_put_32 (output_bfd, got_offset,
3774 (plt->contents + plt_offset
3775 + htab->non_lazy_plt->plt_got_offset));
3778 if (!local_undefweak
3780 && (h->plt.offset != (bfd_vma) -1
3781 || eh->plt_got.offset != (bfd_vma) -1))
3783 /* Mark the symbol as undefined, rather than as defined in
3784 the .plt section. Leave the value if there were any
3785 relocations where pointer equality matters (this is a clue
3786 for the dynamic linker, to make function pointer
3787 comparisons work between an application and shared
3788 library), otherwise set it to zero. If a function is only
3789 called from a binary, there is no need to slow down
3790 shared libraries because of that. */
3791 sym->st_shndx = SHN_UNDEF;
3792 if (!h->pointer_equality_needed)
3796 /* Don't generate dynamic GOT relocation against undefined weak
3797 symbol in executable. */
3798 if (h->got.offset != (bfd_vma) -1
3799 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3800 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3801 && !local_undefweak)
3803 Elf_Internal_Rela rel;
3804 asection *relgot = htab->elf.srelgot;
3806 /* This symbol has an entry in the global offset table. Set it
3809 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3812 rel.r_offset = (htab->elf.sgot->output_section->vma
3813 + htab->elf.sgot->output_offset
3814 + (h->got.offset & ~(bfd_vma) 1));
3816 /* If this is a static link, or it is a -Bsymbolic link and the
3817 symbol is defined locally or was forced to be local because
3818 of a version file, we just want to emit a RELATIVE reloc.
3819 The entry in the global offset table will already have been
3820 initialized in the relocate_section function. */
3822 && h->type == STT_GNU_IFUNC)
3824 if (h->plt.offset == (bfd_vma) -1)
3826 /* STT_GNU_IFUNC is referenced without PLT. */
3827 if (htab->elf.splt == NULL)
3829 /* use .rel[a].iplt section to store .got relocations
3830 in static executable. */
3831 relgot = htab->elf.irelplt;
3833 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3835 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3836 h->root.root.string,
3837 h->root.u.def.section->owner);
3839 bfd_put_32 (output_bfd,
3840 (h->root.u.def.value
3841 + h->root.u.def.section->output_section->vma
3842 + h->root.u.def.section->output_offset),
3843 htab->elf.sgot->contents + h->got.offset);
3844 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3849 else if (bfd_link_pic (info))
3851 /* Generate R_386_GLOB_DAT. */
3859 if (!h->pointer_equality_needed)
3862 /* For non-shared object, we can't use .got.plt, which
3863 contains the real function addres if we need pointer
3864 equality. We load the GOT entry with the PLT entry. */
3865 if (htab->plt_second != NULL)
3867 plt = htab->plt_second;
3868 plt_offset = eh->plt_second.offset;
3872 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3873 plt_offset = h->plt.offset;
3875 bfd_put_32 (output_bfd,
3876 (plt->output_section->vma
3877 + plt->output_offset + plt_offset),
3878 htab->elf.sgot->contents + h->got.offset);
3882 else if (bfd_link_pic (info)
3883 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3885 BFD_ASSERT((h->got.offset & 1) != 0);
3886 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3890 BFD_ASSERT((h->got.offset & 1) == 0);
3892 bfd_put_32 (output_bfd, (bfd_vma) 0,
3893 htab->elf.sgot->contents + h->got.offset);
3894 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3897 elf_append_rel (output_bfd, relgot, &rel);
3902 Elf_Internal_Rela rel;
3905 /* This symbol needs a copy reloc. Set it up. */
3906 VERIFY_COPY_RELOC (h, htab)
3908 rel.r_offset = (h->root.u.def.value
3909 + h->root.u.def.section->output_section->vma
3910 + h->root.u.def.section->output_offset);
3911 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3912 if (h->root.u.def.section == htab->elf.sdynrelro)
3913 s = htab->elf.sreldynrelro;
3915 s = htab->elf.srelbss;
3916 elf_append_rel (output_bfd, s, &rel);
3922 /* Finish up local dynamic symbol handling. We set the contents of
3923 various dynamic sections here. */
3926 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3928 struct elf_link_hash_entry *h
3929 = (struct elf_link_hash_entry *) *slot;
3930 struct bfd_link_info *info
3931 = (struct bfd_link_info *) inf;
3933 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3937 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3938 here since undefined weak symbol may not be dynamic and may not be
3939 called for elf_i386_finish_dynamic_symbol. */
3942 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3945 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3946 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3948 if (h->root.type != bfd_link_hash_undefweak
3949 || h->dynindx != -1)
3952 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3956 /* Used to decide how to sort relocs in an optimal manner for the
3957 dynamic linker, before writing them out. */
3959 static enum elf_reloc_type_class
3960 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3961 const asection *rel_sec ATTRIBUTE_UNUSED,
3962 const Elf_Internal_Rela *rela)
3964 bfd *abfd = info->output_bfd;
3965 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3966 struct elf_link_hash_table *htab = elf_hash_table (info);
3968 if (htab->dynsym != NULL
3969 && htab->dynsym->contents != NULL)
3971 /* Check relocation against STT_GNU_IFUNC symbol if there are
3973 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3974 if (r_symndx != STN_UNDEF)
3976 Elf_Internal_Sym sym;
3977 if (!bed->s->swap_symbol_in (abfd,
3978 (htab->dynsym->contents
3979 + r_symndx * sizeof (Elf32_External_Sym)),
3983 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3984 return reloc_class_ifunc;
3988 switch (ELF32_R_TYPE (rela->r_info))
3990 case R_386_IRELATIVE:
3991 return reloc_class_ifunc;
3992 case R_386_RELATIVE:
3993 return reloc_class_relative;
3994 case R_386_JUMP_SLOT:
3995 return reloc_class_plt;
3997 return reloc_class_copy;
3999 return reloc_class_normal;
4003 /* Finish up the dynamic sections. */
4006 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4007 struct bfd_link_info *info)
4009 struct elf_x86_link_hash_table *htab;
4011 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
4015 if (!htab->elf.dynamic_sections_created)
4018 if (htab->elf.splt && htab->elf.splt->size > 0)
4020 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4021 really seem like the right value. */
4022 elf_section_data (htab->elf.splt->output_section)
4023 ->this_hdr.sh_entsize = 4;
4025 if (htab->plt.has_plt0)
4027 /* Fill in the special first entry in the procedure linkage
4029 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4030 htab->lazy_plt->plt0_entry_size);
4031 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4032 htab->plt0_pad_byte,
4033 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4034 if (!bfd_link_pic (info))
4036 bfd_put_32 (output_bfd,
4037 (htab->elf.sgotplt->output_section->vma
4038 + htab->elf.sgotplt->output_offset
4040 htab->elf.splt->contents
4041 + htab->lazy_plt->plt0_got1_offset);
4042 bfd_put_32 (output_bfd,
4043 (htab->elf.sgotplt->output_section->vma
4044 + htab->elf.sgotplt->output_offset
4046 htab->elf.splt->contents
4047 + htab->lazy_plt->plt0_got2_offset);
4049 if (htab->target_os == is_vxworks)
4051 Elf_Internal_Rela rel;
4052 int num_plts = (htab->elf.splt->size
4053 / htab->plt.plt_entry_size) - 1;
4055 asection *srelplt2 = htab->srelplt2;
4057 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4058 + 4. On IA32 we use REL relocations so the
4059 addend goes in the PLT directly. */
4060 rel.r_offset = (htab->elf.splt->output_section->vma
4061 + htab->elf.splt->output_offset
4062 + htab->lazy_plt->plt0_got1_offset);
4063 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4065 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4066 srelplt2->contents);
4067 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4069 rel.r_offset = (htab->elf.splt->output_section->vma
4070 + htab->elf.splt->output_offset
4071 + htab->lazy_plt->plt0_got2_offset);
4072 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4074 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4075 srelplt2->contents +
4076 sizeof (Elf32_External_Rel));
4077 /* Correct the .rel.plt.unloaded relocations. */
4078 p = srelplt2->contents;
4079 if (bfd_link_pic (info))
4080 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4082 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4084 for (; num_plts; num_plts--)
4086 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4087 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4089 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4090 p += sizeof (Elf32_External_Rel);
4092 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4093 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4095 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4096 p += sizeof (Elf32_External_Rel);
4103 /* Fill PLT entries for undefined weak symbols in PIE. */
4104 if (bfd_link_pie (info))
4105 bfd_hash_traverse (&info->hash->table,
4106 elf_i386_pie_finish_undefweak_symbol,
4112 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4113 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4114 It has to be done before elf_link_sort_relocs is called so that
4115 dynamic relocations are properly sorted. */
4118 elf_i386_output_arch_local_syms
4119 (bfd *output_bfd ATTRIBUTE_UNUSED,
4120 struct bfd_link_info *info,
4121 void *flaginfo ATTRIBUTE_UNUSED,
4122 int (*func) (void *, const char *,
4125 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4127 struct elf_x86_link_hash_table *htab
4128 = elf_x86_hash_table (info, I386_ELF_DATA);
4132 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4133 htab_traverse (htab->loc_hash_table,
4134 elf_i386_finish_local_dynamic_symbol,
4140 /* Forward declaration. */
4141 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4143 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4144 dynamic relocations. */
4147 elf_i386_get_synthetic_symtab (bfd *abfd,
4148 long symcount ATTRIBUTE_UNUSED,
4149 asymbol **syms ATTRIBUTE_UNUSED,
4156 bfd_byte *plt_contents;
4158 const struct elf_x86_lazy_plt_layout *lazy_plt;
4159 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4160 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4161 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4164 enum elf_x86_plt_type plt_type;
4165 struct elf_x86_plt plts[] =
4167 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4168 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4169 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4170 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4175 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4178 if (dynsymcount <= 0)
4181 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4185 non_lazy_plt = NULL;
4186 /* Silence GCC 6. */
4188 non_lazy_ibt_plt = NULL;
4189 lazy_ibt_plt = NULL;
4190 switch (get_elf_x86_backend_data (abfd)->target_os)
4194 non_lazy_plt = &elf_i386_non_lazy_plt;
4195 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4196 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4199 lazy_plt = &elf_i386_lazy_plt;
4202 lazy_plt = &elf_i386_nacl_plt;
4209 for (j = 0; plts[j].name != NULL; j++)
4211 plt = bfd_get_section_by_name (abfd, plts[j].name);
4212 if (plt == NULL || plt->size == 0)
4215 /* Get the PLT section contents. */
4216 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4217 if (plt_contents == NULL)
4219 if (!bfd_get_section_contents (abfd, (asection *) plt,
4220 plt_contents, 0, plt->size))
4222 free (plt_contents);
4226 /* Check what kind of PLT it is. */
4227 plt_type = plt_unknown;
4228 if (plts[j].type == plt_unknown
4229 && (plt->size >= (lazy_plt->plt0_entry_size
4230 + lazy_plt->plt_entry_size)))
4232 /* Match lazy PLT first. */
4233 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4234 lazy_plt->plt0_got1_offset) == 0)
4236 /* The fist entry in the lazy IBT PLT is the same as the
4238 if (lazy_ibt_plt != NULL
4239 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4240 lazy_ibt_plt->plt_entry,
4241 lazy_ibt_plt->plt_got_offset) == 0))
4242 plt_type = plt_lazy | plt_second;
4244 plt_type = plt_lazy;
4246 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4247 lazy_plt->plt0_got1_offset) == 0)
4249 /* The fist entry in the PIC lazy IBT PLT is the same as
4250 the normal PIC lazy PLT. */
4251 if (lazy_ibt_plt != NULL
4252 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4253 lazy_ibt_plt->pic_plt_entry,
4254 lazy_ibt_plt->plt_got_offset) == 0))
4255 plt_type = plt_lazy | plt_pic | plt_second;
4257 plt_type = plt_lazy | plt_pic;
4261 if (non_lazy_plt != NULL
4262 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4263 && plt->size >= non_lazy_plt->plt_entry_size)
4265 /* Match non-lazy PLT. */
4266 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4267 non_lazy_plt->plt_got_offset) == 0)
4268 plt_type = plt_non_lazy;
4269 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4270 non_lazy_plt->plt_got_offset) == 0)
4274 if ((non_lazy_ibt_plt != NULL)
4275 && (plt_type == plt_unknown || plt_type == plt_second)
4276 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4278 if (memcmp (plt_contents,
4279 non_lazy_ibt_plt->plt_entry,
4280 non_lazy_ibt_plt->plt_got_offset) == 0)
4282 /* Match IBT PLT. */
4283 plt_type = plt_second;
4284 non_lazy_plt = non_lazy_ibt_plt;
4286 else if (memcmp (plt_contents,
4287 non_lazy_ibt_plt->pic_plt_entry,
4288 non_lazy_ibt_plt->plt_got_offset) == 0)
4290 /* Match PIC IBT PLT. */
4291 plt_type = plt_second | plt_pic;
4292 non_lazy_plt = non_lazy_ibt_plt;
4296 if (plt_type == plt_unknown)
4298 free (plt_contents);
4303 plts[j].type = plt_type;
4305 if ((plt_type & plt_lazy))
4307 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4308 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4309 /* Skip PLT0 in lazy PLT. */
4314 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4315 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4319 /* Skip lazy PLT when the second PLT is used. */
4320 if ((plt_type & (plt_lazy | plt_second))
4321 == (plt_lazy | plt_second))
4325 n = plt->size / plts[j].plt_entry_size;
4330 plts[j].contents = plt_contents;
4332 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4333 if ((plt_type & plt_pic))
4334 got_addr = (bfd_vma) -1;
4337 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4338 got_addr, plts, dynsyms,
4342 /* Set up i386 GNU properties. Return the first relocatable ELF input
4343 with GNU properties if found. Otherwise, return NULL. */
4346 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4348 struct elf_x86_init_table init_table;
4350 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4354 init_table.plt0_pad_byte = 0x0;
4355 init_table.lazy_plt = &elf_i386_lazy_plt;
4356 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4357 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4358 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4361 init_table.plt0_pad_byte = 0x90;
4362 init_table.lazy_plt = &elf_i386_lazy_plt;
4363 init_table.non_lazy_plt = NULL;
4364 init_table.lazy_ibt_plt = NULL;
4365 init_table.non_lazy_ibt_plt = NULL;
4368 init_table.plt0_pad_byte = 0x90;
4369 init_table.lazy_plt = &elf_i386_nacl_plt;
4370 init_table.non_lazy_plt = NULL;
4371 init_table.lazy_ibt_plt = NULL;
4372 init_table.non_lazy_ibt_plt = NULL;
4376 init_table.r_info = elf32_r_info;
4377 init_table.r_sym = elf32_r_sym;
4379 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4382 #define TARGET_LITTLE_SYM i386_elf32_vec
4383 #define TARGET_LITTLE_NAME "elf32-i386"
4384 #define ELF_ARCH bfd_arch_i386
4385 #define ELF_TARGET_ID I386_ELF_DATA
4386 #define ELF_MACHINE_CODE EM_386
4387 #define ELF_MAXPAGESIZE 0x1000
4389 #define elf_backend_can_gc_sections 1
4390 #define elf_backend_can_refcount 1
4391 #define elf_backend_want_got_plt 1
4392 #define elf_backend_plt_readonly 1
4393 #define elf_backend_want_plt_sym 0
4394 #define elf_backend_got_header_size 12
4395 #define elf_backend_plt_alignment 4
4396 #define elf_backend_dtrel_excludes_plt 1
4397 #define elf_backend_extern_protected_data 1
4398 #define elf_backend_caches_rawsize 1
4399 #define elf_backend_want_dynrelro 1
4401 /* Support RELA for objdump of prelink objects. */
4402 #define elf_info_to_howto elf_i386_info_to_howto_rel
4403 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4405 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4406 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4407 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4408 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4410 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4411 #define elf_backend_check_relocs elf_i386_check_relocs
4412 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4413 #define elf_backend_fake_sections elf_i386_fake_sections
4414 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4415 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4416 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4417 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4418 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4419 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4420 #define elf_backend_relocate_section elf_i386_relocate_section
4421 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4422 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4424 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4426 #include "elf32-target.h"
4428 /* FreeBSD support. */
4430 #undef TARGET_LITTLE_SYM
4431 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4432 #undef TARGET_LITTLE_NAME
4433 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4435 #define ELF_OSABI ELFOSABI_FREEBSD
4437 /* The kernel recognizes executables as valid only if they carry a
4438 "FreeBSD" label in the ELF header. So we put this label on all
4439 executables and (for simplicity) also all other object files. */
4442 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4444 _bfd_elf_post_process_headers (abfd, info);
4446 #ifdef OLD_FREEBSD_ABI_LABEL
4448 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4449 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4450 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4455 #undef elf_backend_post_process_headers
4456 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4458 #define elf32_bed elf32_i386_fbsd_bed
4460 #undef elf_backend_add_symbol_hook
4462 #include "elf32-target.h"
4466 #undef TARGET_LITTLE_SYM
4467 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4468 #undef TARGET_LITTLE_NAME
4469 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4471 static const struct elf_x86_backend_data elf_i386_solaris_arch_bed =
4476 #undef elf_backend_arch_data
4477 #define elf_backend_arch_data &elf_i386_solaris_arch_bed
4479 #undef elf_backend_post_process_headers
4481 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4482 objects won't be recognized. */
4486 #define elf32_bed elf32_i386_sol2_bed
4488 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4490 #undef elf_backend_static_tls_alignment
4491 #define elf_backend_static_tls_alignment 8
4493 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4495 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4497 #undef elf_backend_want_plt_sym
4498 #define elf_backend_want_plt_sym 1
4500 #undef elf_backend_strtab_flags
4501 #define elf_backend_strtab_flags SHF_STRINGS
4503 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4504 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4505 FALSE otherwise. ISECTION is the best guess matching section from the
4506 input bfd IBFD, but it might be NULL. */
4509 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4510 bfd *obfd ATTRIBUTE_UNUSED,
4511 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4512 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4514 /* PR 19938: FIXME: Need to add code for setting the sh_info
4515 and sh_link fields of Solaris specific section types. */
4518 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4519 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4521 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4523 The following values should be set:
4526 -----------------------------------------------------------------------------
4527 SHT_SUNW_ancillary The section header index of 0
4528 [0x6fffffee] the associated string table.
4530 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4531 [0x6ffffff0] the associated symbol table. section header index of
4533 SHT_SUNW_capchain table,
4536 SHT_SUNW_symsort The section header index of 0
4537 [0x6ffffff1] the associated symbol table.
4539 SHT_SUNW_tlssort The section header index of 0
4540 [0x6ffffff2] the associated symbol table.
4542 SHT_SUNW_LDYNSYM The section header index of One greater than the
4543 [0x6ffffff3] the associated string table. symbol table index of the
4544 This index is the same string last local symbol,
4545 table used by the SHT_DYNSYM STB_LOCAL. Since
4546 section. SHT_SUNW_LDYNSYM only
4547 contains local symbols,
4548 sh_info is equivalent to
4549 the number of symbols in
4552 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4553 [0x6ffffff5] the section header index of to named strings, the
4554 the associated section header index of
4555 SHT_SUNW_capinfo table, the associated string
4556 otherwise 0. table, otherwise 0.
4558 SHT_SUNW_move The section header index of 0
4559 [0x6ffffffa] the associated symbol table.
4564 SHT_SUNW_syminfo The section header index of The section header index
4565 [0x6ffffffc] the associated symbol table. of the associated
4568 SHT_SUNW_verdef The section header index of The number of version
4569 [0x6ffffffd] the associated string table. definitions within the
4572 SHT_SUNW_verneed The section header index of The number of version
4573 [0x6ffffffe] the associated string table. dependencies within the
4576 SHT_SUNW_versym The section header index of 0
4577 [0x6fffffff] the associated symbol table. */
4580 #undef elf_backend_copy_special_section_fields
4581 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4583 #include "elf32-target.h"
4585 /* Intel MCU support. */
4588 elf32_iamcu_elf_object_p (bfd *abfd)
4590 /* Set the right machine number for an IAMCU elf32 file. */
4591 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4595 #undef TARGET_LITTLE_SYM
4596 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4597 #undef TARGET_LITTLE_NAME
4598 #define TARGET_LITTLE_NAME "elf32-iamcu"
4600 #define ELF_ARCH bfd_arch_iamcu
4602 #undef ELF_MACHINE_CODE
4603 #define ELF_MACHINE_CODE EM_IAMCU
4605 #undef elf_backend_arch_data
4606 #define elf_backend_arch_data &elf_i386_arch_bed
4611 #define elf32_bed elf32_iamcu_bed
4613 #undef elf_backend_object_p
4614 #define elf_backend_object_p elf32_iamcu_elf_object_p
4616 #undef elf_backend_static_tls_alignment
4618 #undef elf_backend_want_plt_sym
4619 #define elf_backend_want_plt_sym 0
4621 #undef elf_backend_strtab_flags
4622 #undef elf_backend_copy_special_section_fields
4624 #include "elf32-target.h"
4626 /* Restore defaults. */
4628 #define ELF_ARCH bfd_arch_i386
4629 #undef ELF_MACHINE_CODE
4630 #define ELF_MACHINE_CODE EM_386
4632 /* Native Client support. */
4634 #undef TARGET_LITTLE_SYM
4635 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4636 #undef TARGET_LITTLE_NAME
4637 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4639 #define elf32_bed elf32_i386_nacl_bed
4641 #undef ELF_MAXPAGESIZE
4642 #define ELF_MAXPAGESIZE 0x10000
4644 /* Restore defaults. */
4646 #undef elf_backend_want_plt_sym
4647 #define elf_backend_want_plt_sym 0
4648 #undef elf_backend_post_process_headers
4649 #undef elf_backend_static_tls_alignment
4651 /* NaCl uses substantially different PLT entries for the same effects. */
4653 #undef elf_backend_plt_alignment
4654 #define elf_backend_plt_alignment 5
4655 #define NACL_PLT_ENTRY_SIZE 64
4656 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4658 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4660 0xff, 0x35, /* pushl contents of address */
4661 0, 0, 0, 0, /* replaced with address of .got + 4. */
4662 0x8b, 0x0d, /* movl contents of address, %ecx */
4663 0, 0, 0, 0, /* replaced with address of .got + 8. */
4664 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4665 0xff, 0xe1 /* jmp *%ecx */
4668 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4670 0x8b, 0x0d, /* movl contents of address, %ecx */
4671 0, 0, 0, 0, /* replaced with GOT slot address. */
4672 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4673 0xff, 0xe1, /* jmp *%ecx */
4675 /* Pad to the next 32-byte boundary with nop instructions. */
4677 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4678 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4680 /* Lazy GOT entries point here (32-byte aligned). */
4681 0x68, /* pushl immediate */
4682 0, 0, 0, 0, /* replaced with reloc offset. */
4683 0xe9, /* jmp relative */
4684 0, 0, 0, 0, /* replaced with offset to .plt. */
4686 /* Pad to the next 32-byte boundary with nop instructions. */
4687 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4688 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4692 static const bfd_byte
4693 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4695 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4696 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4697 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4698 0xff, 0xe1, /* jmp *%ecx */
4700 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4701 so pad to that size with nop instructions. */
4702 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4705 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4707 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4708 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4709 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4710 0xff, 0xe1, /* jmp *%ecx */
4712 /* Pad to the next 32-byte boundary with nop instructions. */
4714 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4715 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4717 /* Lazy GOT entries point here (32-byte aligned). */
4718 0x68, /* pushl immediate */
4719 0, 0, 0, 0, /* replaced with offset into relocation table. */
4720 0xe9, /* jmp relative */
4721 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4723 /* Pad to the next 32-byte boundary with nop instructions. */
4724 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4725 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4729 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4731 #if (PLT_CIE_LENGTH != 20 \
4732 || PLT_FDE_LENGTH != 36 \
4733 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4734 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4735 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4737 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4738 0, 0, 0, 0, /* CIE ID */
4739 1, /* CIE version */
4740 'z', 'R', 0, /* Augmentation string */
4741 1, /* Code alignment factor */
4742 0x7c, /* Data alignment factor: -4 */
4743 8, /* Return address column */
4744 1, /* Augmentation size */
4745 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4746 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4747 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4748 DW_CFA_nop, DW_CFA_nop,
4750 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4751 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4752 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4753 0, 0, 0, 0, /* .plt size goes here */
4754 0, /* Augmentation size */
4755 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4756 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4757 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4758 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4759 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4760 13, /* Block length */
4761 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4762 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4763 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4764 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4765 DW_CFA_nop, DW_CFA_nop
4768 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4770 elf_i386_nacl_plt0_entry, /* plt0_entry */
4771 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4772 elf_i386_nacl_plt_entry, /* plt_entry */
4773 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4774 2, /* plt0_got1_offset */
4775 8, /* plt0_got2_offset */
4776 0, /* plt0_got2_insn_end */
4777 2, /* plt_got_offset */
4778 33, /* plt_reloc_offset */
4779 38, /* plt_plt_offset */
4780 0, /* plt_got_insn_size */
4781 0, /* plt_plt_insn_end */
4782 32, /* plt_lazy_offset */
4783 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4784 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4785 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4786 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4789 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4795 elf32_i386_nacl_elf_object_p (bfd *abfd)
4797 /* Set the right machine number for a NaCl i386 ELF32 file. */
4798 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4802 #undef elf_backend_arch_data
4803 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4805 #undef elf_backend_object_p
4806 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4807 #undef elf_backend_modify_segment_map
4808 #define elf_backend_modify_segment_map nacl_modify_segment_map
4809 #undef elf_backend_modify_program_headers
4810 #define elf_backend_modify_program_headers nacl_modify_program_headers
4811 #undef elf_backend_final_write_processing
4812 #define elf_backend_final_write_processing nacl_final_write_processing
4814 #include "elf32-target.h"
4816 /* Restore defaults. */
4817 #undef elf_backend_object_p
4818 #undef elf_backend_modify_segment_map
4819 #undef elf_backend_modify_program_headers
4820 #undef elf_backend_final_write_processing
4822 /* VxWorks support. */
4824 #undef TARGET_LITTLE_SYM
4825 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4826 #undef TARGET_LITTLE_NAME
4827 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4829 #undef ELF_MAXPAGESIZE
4830 #define ELF_MAXPAGESIZE 0x1000
4831 #undef elf_backend_plt_alignment
4832 #define elf_backend_plt_alignment 4
4834 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4839 #undef elf_backend_arch_data
4840 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4842 #undef elf_backend_relocs_compatible
4843 #undef elf_backend_add_symbol_hook
4844 #define elf_backend_add_symbol_hook \
4845 elf_vxworks_add_symbol_hook
4846 #undef elf_backend_link_output_symbol_hook
4847 #define elf_backend_link_output_symbol_hook \
4848 elf_vxworks_link_output_symbol_hook
4849 #undef elf_backend_emit_relocs
4850 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4851 #undef elf_backend_final_write_processing
4852 #define elf_backend_final_write_processing \
4853 elf_vxworks_final_write_processing
4854 #undef elf_backend_static_tls_alignment
4856 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4858 #undef elf_backend_want_plt_sym
4859 #define elf_backend_want_plt_sym 1
4862 #define elf32_bed elf32_i386_vxworks_bed
4864 #include "elf32-target.h"