1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2019 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,
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];
350 /* xgettext:c-format */
351 _bfd_error_handler (_("%pB: unsupported relocation type: %#x"),
353 bfd_set_error (bfd_error_bad_value);
358 static reloc_howto_type *
359 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
364 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
365 if (elf_howto_table[i].name != NULL
366 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
367 return &elf_howto_table[i];
372 static reloc_howto_type *
373 elf_i386_rtype_to_howto (unsigned r_type)
377 if ((indx = r_type) >= R_386_standard
378 && ((indx = r_type - R_386_ext_offset) - R_386_standard
379 >= R_386_ext - R_386_standard)
380 && ((indx = r_type - R_386_tls_offset) - R_386_ext
381 >= R_386_ext2 - R_386_ext)
382 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
383 >= R_386_vt - R_386_ext2))
385 /* PR 17512: file: 0f67f69d. */
386 if (elf_howto_table [indx].type != r_type)
388 return &elf_howto_table[indx];
392 elf_i386_info_to_howto_rel (bfd *abfd,
394 Elf_Internal_Rela *dst)
396 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
398 if ((cache_ptr->howto = elf_i386_rtype_to_howto (r_type)) == NULL)
400 /* xgettext:c-format */
401 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
403 bfd_set_error (bfd_error_bad_value);
410 /* Return whether a symbol name implies a local label. The UnixWare
411 2.1 cc generates temporary symbols that start with .X, so we
412 recognize them here. FIXME: do other SVR4 compilers also use .X?.
413 If so, we should move the .X recognition into
414 _bfd_elf_is_local_label_name. */
417 elf_i386_is_local_label_name (bfd *abfd, const char *name)
419 if (name[0] == '.' && name[1] == 'X')
422 return _bfd_elf_is_local_label_name (abfd, name);
425 /* Support for core dump NOTE sections. */
428 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
433 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
435 int pr_version = bfd_get_32 (abfd, note->descdata);
441 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
444 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
448 size = bfd_get_32 (abfd, note->descdata + 8);
452 switch (note->descsz)
457 case 144: /* Linux/i386 */
459 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
462 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
472 /* Make a ".reg/999" section. */
473 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
474 size, note->descpos + offset);
478 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
480 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
482 int pr_version = bfd_get_32 (abfd, note->descdata);
487 elf_tdata (abfd)->core->program
488 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
489 elf_tdata (abfd)->core->command
490 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
494 switch (note->descsz)
499 case 124: /* Linux/i386 elf_prpsinfo. */
500 elf_tdata (abfd)->core->pid
501 = bfd_get_32 (abfd, note->descdata + 12);
502 elf_tdata (abfd)->core->program
503 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
504 elf_tdata (abfd)->core->command
505 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
509 /* Note that for some reason, a spurious space is tacked
510 onto the end of the args in some (at least one anyway)
511 implementations, so strip it off if it exists. */
513 char *command = elf_tdata (abfd)->core->command;
514 int n = strlen (command);
516 if (0 < n && command[n - 1] == ' ')
517 command[n - 1] = '\0';
523 /* Functions for the i386 ELF linker.
525 In order to gain some understanding of code in this file without
526 knowing all the intricate details of the linker, note the
529 Functions named elf_i386_* are called by external routines, other
530 functions are only called locally. elf_i386_* functions appear
531 in this file more or less in the order in which they are called
532 from external routines. eg. elf_i386_check_relocs is called
533 early in the link process, elf_i386_finish_dynamic_sections is
534 one of the last functions. */
536 /* The size in bytes of an entry in the lazy procedure linkage table. */
538 #define LAZY_PLT_ENTRY_SIZE 16
540 /* The size in bytes of an entry in the non-lazy procedure linkage
543 #define NON_LAZY_PLT_ENTRY_SIZE 8
545 /* The first entry in an absolute lazy procedure linkage table looks
546 like this. See the SVR4 ABI i386 supplement to see how this works.
547 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
549 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
551 0xff, 0x35, /* pushl contents of address */
552 0, 0, 0, 0, /* replaced with address of .got + 4. */
553 0xff, 0x25, /* jmp indirect */
554 0, 0, 0, 0 /* replaced with address of .got + 8. */
557 /* Subsequent entries in an absolute lazy procedure linkage table look
560 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
562 0xff, 0x25, /* jmp indirect */
563 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
564 0x68, /* pushl immediate */
565 0, 0, 0, 0, /* replaced with offset into relocation table. */
566 0xe9, /* jmp relative */
567 0, 0, 0, 0 /* replaced with offset to start of .plt. */
570 /* The first entry in a PIC lazy procedure linkage table look like
571 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
572 lazy_plt->plt0_pad_byte. */
574 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
576 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
577 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
580 /* Subsequent entries in a PIC lazy procedure linkage table look like
583 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
585 0xff, 0xa3, /* jmp *offset(%ebx) */
586 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
587 0x68, /* pushl immediate */
588 0, 0, 0, 0, /* replaced with offset into relocation table. */
589 0xe9, /* jmp relative */
590 0, 0, 0, 0 /* replaced with offset to start of .plt. */
593 /* Entries in the non-lazy procedure linkage table look like this. */
595 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
597 0xff, 0x25, /* jmp indirect */
598 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
599 0x66, 0x90 /* xchg %ax,%ax */
602 /* Entries in the PIC non-lazy procedure linkage table look like
605 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
607 0xff, 0xa3, /* jmp *offset(%ebx) */
608 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
612 /* The first entry in an absolute IBT-enabled lazy procedure linkage
613 table looks like this. */
615 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
617 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
618 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
619 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
622 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
623 table look like this. Subsequent entries for a PIC IBT-enabled lazy
624 procedure linkage table are the same. */
626 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
628 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
629 0x68, 0, 0, 0, 0, /* pushl immediate */
630 0xe9, 0, 0, 0, 0, /* jmp relative */
631 0x66, 0x90 /* xchg %ax,%ax */
634 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
637 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
639 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
640 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
641 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
644 /* Entries for branches with IBT-enabled in the absolute non-lazey
645 procedure linkage table look like this. They have the same size
646 as the lazy PLT entry. */
648 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
650 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
651 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
652 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
655 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
656 linkage table look like this. They have the same size as the lazy
659 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
661 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
662 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
663 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
666 /* .eh_frame covering the lazy .plt section. */
668 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
670 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
671 0, 0, 0, 0, /* CIE ID */
673 'z', 'R', 0, /* Augmentation string */
674 1, /* Code alignment factor */
675 0x7c, /* Data alignment factor */
676 8, /* Return address column */
677 1, /* Augmentation size */
678 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
679 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
680 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
681 DW_CFA_nop, DW_CFA_nop,
683 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
684 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
685 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
686 0, 0, 0, 0, /* .plt size goes here */
687 0, /* Augmentation size */
688 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
689 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
690 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
691 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
692 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
693 11, /* Block length */
694 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
695 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
696 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
697 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
698 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
701 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
703 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
705 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
706 0, 0, 0, 0, /* CIE ID */
708 'z', 'R', 0, /* Augmentation string */
709 1, /* Code alignment factor */
710 0x7c, /* Data alignment factor */
711 8, /* Return address column */
712 1, /* Augmentation size */
713 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
714 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
715 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
716 DW_CFA_nop, DW_CFA_nop,
718 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
719 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
720 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
721 0, 0, 0, 0, /* .plt size goes here */
722 0, /* Augmentation size */
723 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
724 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
725 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
726 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
727 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
728 11, /* Block length */
729 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
730 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
731 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
732 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
733 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
736 /* .eh_frame covering the non-lazy .plt section. */
738 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
740 #define PLT_GOT_FDE_LENGTH 16
741 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
742 0, 0, 0, 0, /* CIE ID */
744 'z', 'R', 0, /* Augmentation string */
745 1, /* Code alignment factor */
746 0x7c, /* Data alignment factor */
747 8, /* Return address column */
748 1, /* Augmentation size */
749 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
750 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
751 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
752 DW_CFA_nop, DW_CFA_nop,
754 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
755 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
756 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
757 0, 0, 0, 0, /* non-lazy .plt size goes here */
758 0, /* Augmentation size */
759 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
762 /* These are the standard parameters. */
763 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
765 elf_i386_lazy_plt0_entry, /* plt0_entry */
766 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
767 elf_i386_lazy_plt_entry, /* plt_entry */
768 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
769 NULL, /* plt_tlsdesc_entry */
770 0, /* plt_tlsdesc_entry_size*/
771 0, /* plt_tlsdesc_got1_offset */
772 0, /* plt_tlsdesc_got2_offset */
773 0, /* plt_tlsdesc_got1_insn_end */
774 0, /* plt_tlsdesc_got2_insn_end */
775 2, /* plt0_got1_offset */
776 8, /* plt0_got2_offset */
777 0, /* plt0_got2_insn_end */
778 2, /* plt_got_offset */
779 7, /* plt_reloc_offset */
780 12, /* plt_plt_offset */
781 0, /* plt_got_insn_size */
782 0, /* plt_plt_insn_end */
783 6, /* plt_lazy_offset */
784 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
785 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
786 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
787 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
790 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
792 elf_i386_non_lazy_plt_entry, /* plt_entry */
793 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
794 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
795 2, /* plt_got_offset */
796 0, /* plt_got_insn_size */
797 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
798 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
801 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
803 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
804 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
805 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
806 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
807 NULL, /* plt_tlsdesc_entry */
808 0, /* plt_tlsdesc_entry_size*/
809 0, /* plt_tlsdesc_got1_offset */
810 0, /* plt_tlsdesc_got2_offset */
811 0, /* plt_tlsdesc_got1_insn_end */
812 0, /* plt_tlsdesc_got2_insn_end */
813 2, /* plt0_got1_offset */
814 8, /* plt0_got2_offset */
815 0, /* plt0_got2_insn_end */
816 4+2, /* plt_got_offset */
817 4+1, /* plt_reloc_offset */
818 4+6, /* plt_plt_offset */
819 0, /* plt_got_insn_size */
820 0, /* plt_plt_insn_end */
821 0, /* plt_lazy_offset */
822 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
823 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
824 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
825 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
828 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
830 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
831 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
832 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
833 4+2, /* plt_got_offset */
834 0, /* plt_got_insn_size */
835 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
836 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
840 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
841 for the PLTResolve stub and then for each PLT entry. */
842 #define PLTRESOLVE_RELOCS_SHLIB 0
843 #define PLTRESOLVE_RELOCS 2
844 #define PLT_NON_JUMP_SLOT_RELOCS 2
846 /* These are the standard parameters. */
847 static const struct elf_x86_backend_data elf_i386_arch_bed =
852 #define elf_backend_arch_data &elf_i386_arch_bed
854 /* Return TRUE if the TLS access code sequence support transition
858 elf_i386_check_tls_transition (asection *sec,
860 Elf_Internal_Shdr *symtab_hdr,
861 struct elf_link_hash_entry **sym_hashes,
863 const Elf_Internal_Rela *rel,
864 const Elf_Internal_Rela *relend)
866 unsigned int val, type, reg;
867 unsigned long r_symndx;
868 struct elf_link_hash_entry *h;
871 bfd_boolean indirect_call;
873 offset = rel->r_offset;
878 if (offset < 2 || (rel + 1) >= relend)
881 indirect_call = FALSE;
882 call = contents + offset + 4;
885 if (r_type == R_386_TLS_GD)
887 /* Check transition from GD access model. Only
888 leal foo@tlsgd(,%ebx,1), %eax
889 call ___tls_get_addr@PLT
891 leal foo@tlsgd(%ebx) %eax
892 call ___tls_get_addr@PLT
895 leal foo@tlsgd(%reg), %eax
896 call *___tls_get_addr@GOT(%reg)
897 which may be converted to
898 addr32 call ___tls_get_addr
899 can transit to different access model. */
900 if ((offset + 10) > sec->size
901 || (type != 0x8d && type != 0x04))
906 /* leal foo@tlsgd(,%ebx,1), %eax
907 call ___tls_get_addr@PLT */
911 if (*(call - 7) != 0x8d
919 leal foo@tlsgd(%ebx), %eax
920 call ___tls_get_addr@PLT
923 leal foo@tlsgd(%reg), %eax
924 call *___tls_get_addr@GOT(%reg)
925 which may be converted to
926 addr32 call ___tls_get_addr
928 %eax can't be used as the GOT base register since it
929 is used to pass parameter to ___tls_get_addr. */
931 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
934 indirect_call = call[0] == 0xff;
935 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
936 && !(call[0] == 0x67 && call[1] == 0xe8)
938 && (call[1] & 0xf8) == 0x90
939 && (call[1] & 0x7) == reg))
945 /* Check transition from LD access model. Only
946 leal foo@tlsldm(%ebx), %eax
947 call ___tls_get_addr@PLT
949 leal foo@tlsldm(%reg), %eax
950 call *___tls_get_addr@GOT(%reg)
951 which may be converted to
952 addr32 call ___tls_get_addr
953 can transit to different access model. */
954 if (type != 0x8d || (offset + 9) > sec->size)
957 /* %eax can't be used as the GOT base register since it is
958 used to pass parameter to ___tls_get_addr. */
960 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
963 indirect_call = call[0] == 0xff;
964 if (!(reg == 3 && call[0] == 0xe8)
965 && !(call[0] == 0x67 && call[1] == 0xe8)
967 && (call[1] & 0xf8) == 0x90
968 && (call[1] & 0x7) == reg))
972 r_symndx = ELF32_R_SYM (rel[1].r_info);
973 if (r_symndx < symtab_hdr->sh_info)
976 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
978 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
980 else if (indirect_call)
981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
983 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
984 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
987 /* Check transition from IE access model:
988 movl foo@indntpoff(%rip), %eax
989 movl foo@indntpoff(%rip), %reg
990 addl foo@indntpoff(%rip), %reg
993 if (offset < 1 || (offset + 4) > sec->size)
996 /* Check "movl foo@tpoff(%rip), %eax" first. */
997 val = bfd_get_8 (abfd, contents + offset - 1);
1004 /* Check movl|addl foo@tpoff(%rip), %reg. */
1005 type = bfd_get_8 (abfd, contents + offset - 2);
1006 return ((type == 0x8b || type == 0x03)
1007 && (val & 0xc7) == 0x05);
1009 case R_386_TLS_GOTIE:
1010 case R_386_TLS_IE_32:
1011 /* Check transition from {IE_32,GOTIE} access model:
1012 subl foo@{tpoff,gontoff}(%reg1), %reg2
1013 movl foo@{tpoff,gontoff}(%reg1), %reg2
1014 addl foo@{tpoff,gontoff}(%reg1), %reg2
1017 if (offset < 2 || (offset + 4) > sec->size)
1020 val = bfd_get_8 (abfd, contents + offset - 1);
1021 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1024 type = bfd_get_8 (abfd, contents + offset - 2);
1025 return type == 0x8b || type == 0x2b || type == 0x03;
1027 case R_386_TLS_GOTDESC:
1028 /* Check transition from GDesc access model:
1029 leal x@tlsdesc(%ebx), %eax
1031 Make sure it's a leal adding ebx to a 32-bit offset
1032 into any register, although it's probably almost always
1035 if (offset < 2 || (offset + 4) > sec->size)
1038 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1041 val = bfd_get_8 (abfd, contents + offset - 1);
1042 return (val & 0xc7) == 0x83;
1044 case R_386_TLS_DESC_CALL:
1045 /* Check transition from GDesc access model:
1046 call *x@tlsdesc(%eax)
1048 if (offset + 2 <= sec->size)
1050 /* Make sure that it's a call *x@tlsdesc(%eax). */
1051 call = contents + offset;
1052 return call[0] == 0xff && call[1] == 0x10;
1062 /* Return TRUE if the TLS access transition is OK or no transition
1063 will be performed. Update R_TYPE if there is a transition. */
1066 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1067 asection *sec, bfd_byte *contents,
1068 Elf_Internal_Shdr *symtab_hdr,
1069 struct elf_link_hash_entry **sym_hashes,
1070 unsigned int *r_type, int tls_type,
1071 const Elf_Internal_Rela *rel,
1072 const Elf_Internal_Rela *relend,
1073 struct elf_link_hash_entry *h,
1074 unsigned long r_symndx,
1075 bfd_boolean from_relocate_section)
1077 unsigned int from_type = *r_type;
1078 unsigned int to_type = from_type;
1079 bfd_boolean check = TRUE;
1081 /* Skip TLS transition for functions. */
1083 && (h->type == STT_FUNC
1084 || h->type == STT_GNU_IFUNC))
1090 case R_386_TLS_GOTDESC:
1091 case R_386_TLS_DESC_CALL:
1092 case R_386_TLS_IE_32:
1094 case R_386_TLS_GOTIE:
1095 if (bfd_link_executable (info))
1098 to_type = R_386_TLS_LE_32;
1099 else if (from_type != R_386_TLS_IE
1100 && from_type != R_386_TLS_GOTIE)
1101 to_type = R_386_TLS_IE_32;
1104 /* When we are called from elf_i386_relocate_section, there may
1105 be additional transitions based on TLS_TYPE. */
1106 if (from_relocate_section)
1108 unsigned int new_to_type = to_type;
1110 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1111 new_to_type = R_386_TLS_LE_32;
1113 if (to_type == R_386_TLS_GD
1114 || to_type == R_386_TLS_GOTDESC
1115 || to_type == R_386_TLS_DESC_CALL)
1117 if (tls_type == GOT_TLS_IE_POS)
1118 new_to_type = R_386_TLS_GOTIE;
1119 else if (tls_type & GOT_TLS_IE)
1120 new_to_type = R_386_TLS_IE_32;
1123 /* We checked the transition before when we were called from
1124 elf_i386_check_relocs. We only want to check the new
1125 transition which hasn't been checked before. */
1126 check = new_to_type != to_type && from_type == to_type;
1127 to_type = new_to_type;
1133 if (bfd_link_executable (info))
1134 to_type = R_386_TLS_LE_32;
1141 /* Return TRUE if there is no transition. */
1142 if (from_type == to_type)
1145 /* Check if the transition can be performed. */
1147 && ! elf_i386_check_tls_transition (sec, contents,
1148 symtab_hdr, sym_hashes,
1149 from_type, rel, relend))
1151 reloc_howto_type *from, *to;
1154 from = elf_i386_rtype_to_howto (from_type);
1155 to = elf_i386_rtype_to_howto (to_type);
1158 name = h->root.root.string;
1161 struct elf_x86_link_hash_table *htab;
1163 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1168 Elf_Internal_Sym *isym;
1170 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1172 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1177 /* xgettext:c-format */
1178 (_("%pB: TLS transition from %s to %s against `%s'"
1179 " at %#" PRIx64 " in section `%pA' failed"),
1180 abfd, from->name, to->name, name,
1181 (uint64_t) rel->r_offset, sec);
1182 bfd_set_error (bfd_error_bad_value);
1190 /* With the local symbol, foo, we convert
1191 mov foo@GOT[(%reg1)], %reg2
1193 lea foo[@GOTOFF(%reg1)], %reg2
1195 call/jmp *foo@GOT[(%reg)]
1197 nop call foo/jmp foo nop
1198 When PIC is false, convert
1199 test %reg1, foo@GOT[(%reg2)]
1203 binop foo@GOT[(%reg1)], %reg2
1206 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1211 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1213 unsigned int *r_type_p,
1214 Elf_Internal_Rela *irel,
1215 struct elf_link_hash_entry *h,
1216 bfd_boolean *converted,
1217 struct bfd_link_info *link_info)
1219 struct elf_x86_link_hash_table *htab;
1220 unsigned int opcode;
1222 bfd_boolean baseless;
1223 Elf_Internal_Sym *isym;
1224 unsigned int addend;
1228 bfd_boolean to_reloc_32;
1229 unsigned int r_type;
1230 unsigned int r_symndx;
1231 bfd_vma roff = irel->r_offset;
1232 bfd_boolean local_ref;
1233 struct elf_x86_link_hash_entry *eh;
1238 /* Addend for R_386_GOT32X relocations must be 0. */
1239 addend = bfd_get_32 (abfd, contents + roff);
1243 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1244 is_pic = bfd_link_pic (link_info);
1247 r_symndx = ELF32_R_SYM (irel->r_info);
1249 modrm = bfd_get_8 (abfd, contents + roff - 1);
1250 baseless = (modrm & 0xc7) == 0x5;
1252 if (baseless && is_pic)
1254 /* For PIC, disallow R_386_GOT32X without a base register
1255 since we don't know what the GOT base is. */
1260 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1262 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1265 name = h->root.root.string;
1268 /* xgettext:c-format */
1269 (_("%pB: direct GOT relocation R_386_GOT32X against `%s' without base"
1270 " register can not be used when making a shared object"),
1275 opcode = bfd_get_8 (abfd, contents + roff - 2);
1277 /* Convert to R_386_32 if PIC is false or there is no base
1279 to_reloc_32 = !is_pic || baseless;
1281 eh = elf_x86_hash_entry (h);
1283 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1287 if (opcode == 0x0ff)
1288 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1289 goto convert_branch;
1291 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1292 "test %reg1, foo@GOT(%reg2)" and
1293 "binop foo@GOT[(%reg1)], %reg2". */
1297 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1298 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1300 /* Undefined weak symbol is only bound locally in executable
1301 and its reference is resolved as 0. */
1302 if (h->root.type == bfd_link_hash_undefweak
1308 /* No direct branch to 0 for PIC. */
1312 goto convert_branch;
1316 /* We can convert load of address 0 to R_386_32. */
1324 /* We have "call/jmp *foo@GOT[(%reg)]". */
1325 if ((h->root.type == bfd_link_hash_defined
1326 || h->root.type == bfd_link_hash_defweak)
1329 /* The function is locally defined. */
1331 /* Convert R_386_GOT32X to R_386_PC32. */
1332 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1334 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1337 /* To support TLS optimization, always use addr32 prefix
1338 for "call *___tls_get_addr@GOT(%reg)". */
1339 if (eh && eh->tls_get_addr)
1342 nop_offset = irel->r_offset - 2;
1346 nop = htab->params->call_nop_byte;
1347 if (htab->params->call_nop_as_suffix)
1349 nop_offset = roff + 3;
1350 irel->r_offset -= 1;
1353 nop_offset = roff - 2;
1358 /* Convert to "jmp foo nop". */
1361 nop_offset = roff + 3;
1362 irel->r_offset -= 1;
1365 bfd_put_8 (abfd, nop, contents + nop_offset);
1366 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1367 /* When converting to PC-relative relocation, we
1368 need to adjust addend by -4. */
1369 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1370 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1371 *r_type_p = R_386_PC32;
1377 /* We have "mov foo@GOT[(%re1g)], %reg2",
1378 "test %reg1, foo@GOT(%reg2)" and
1379 "binop foo@GOT[(%reg1)], %reg2".
1381 Avoid optimizing _DYNAMIC since ld.so may use its
1382 link-time address. */
1383 if (h == htab->elf.hdynamic)
1386 /* def_regular is set by an assignment in a linker script in
1387 bfd_elf_record_link_assignment. start_stop is set on
1388 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1392 || h->root.type == bfd_link_hash_defined
1393 || h->root.type == bfd_link_hash_defweak)
1401 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1402 "mov $foo, %reg2" with R_386_32. */
1404 modrm = 0xc0 | (modrm & 0x38) >> 3;
1405 bfd_put_8 (abfd, modrm, contents + roff - 1);
1410 /* Convert "mov foo@GOT(%reg1), %reg2" to
1411 "lea foo@GOTOFF(%reg1), %reg2". */
1412 r_type = R_386_GOTOFF;
1418 /* Only R_386_32 is supported. */
1424 /* Convert "test %reg1, foo@GOT(%reg2)" to
1425 "test $foo, %reg1". */
1426 modrm = 0xc0 | (modrm & 0x38) >> 3;
1431 /* Convert "binop foo@GOT(%reg1), %reg2" to
1432 "binop $foo, %reg2". */
1434 | (modrm & 0x38) >> 3
1438 bfd_put_8 (abfd, modrm, contents + roff - 1);
1442 bfd_put_8 (abfd, opcode, contents + roff - 2);
1443 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1452 /* Rename some of the generic section flags to better document how they
1454 #define check_relocs_failed sec_flg0
1456 /* Look through the relocs for a section during the first phase, and
1457 calculate needed space in the global offset table, procedure linkage
1458 table, and dynamic reloc sections. */
1461 elf_i386_check_relocs (bfd *abfd,
1462 struct bfd_link_info *info,
1464 const Elf_Internal_Rela *relocs)
1466 struct elf_x86_link_hash_table *htab;
1467 Elf_Internal_Shdr *symtab_hdr;
1468 struct elf_link_hash_entry **sym_hashes;
1469 const Elf_Internal_Rela *rel;
1470 const Elf_Internal_Rela *rel_end;
1473 bfd_boolean converted;
1475 if (bfd_link_relocatable (info))
1478 /* Don't do anything special with non-loaded, non-alloced sections.
1479 In particular, any relocs in such sections should not affect GOT
1480 and PLT reference counting (ie. we don't allow them to create GOT
1481 or PLT entries), there's no possibility or desire to optimize TLS
1482 relocs, and there's not much point in propagating relocs to shared
1483 libs that the dynamic linker won't relocate. */
1484 if ((sec->flags & SEC_ALLOC) == 0)
1487 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1490 sec->check_relocs_failed = 1;
1494 BFD_ASSERT (is_x86_elf (abfd, htab));
1496 /* Get the section contents. */
1497 if (elf_section_data (sec)->this_hdr.contents != NULL)
1498 contents = elf_section_data (sec)->this_hdr.contents;
1499 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1501 sec->check_relocs_failed = 1;
1505 symtab_hdr = &elf_symtab_hdr (abfd);
1506 sym_hashes = elf_sym_hashes (abfd);
1512 rel_end = relocs + sec->reloc_count;
1513 for (rel = relocs; rel < rel_end; rel++)
1515 unsigned int r_type;
1516 unsigned int r_symndx;
1517 struct elf_link_hash_entry *h;
1518 struct elf_x86_link_hash_entry *eh;
1519 Elf_Internal_Sym *isym;
1521 bfd_boolean size_reloc;
1523 r_symndx = ELF32_R_SYM (rel->r_info);
1524 r_type = ELF32_R_TYPE (rel->r_info);
1526 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1528 /* xgettext:c-format */
1529 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1534 if (r_symndx < symtab_hdr->sh_info)
1536 /* A local symbol. */
1537 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1542 /* Check relocation against local STT_GNU_IFUNC symbol. */
1543 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1545 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1549 /* Fake a STT_GNU_IFUNC symbol. */
1550 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1552 h->type = STT_GNU_IFUNC;
1555 h->forced_local = 1;
1556 h->root.type = bfd_link_hash_defined;
1564 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1565 while (h->root.type == bfd_link_hash_indirect
1566 || h->root.type == bfd_link_hash_warning)
1567 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1570 eh = (struct elf_x86_link_hash_entry *) h;
1573 if (r_type == R_386_GOTOFF)
1576 /* It is referenced by a non-shared object. */
1580 if (r_type == R_386_GOT32X
1581 && (h == NULL || h->type != STT_GNU_IFUNC))
1583 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1584 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1590 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1591 symtab_hdr, sym_hashes,
1592 &r_type, GOT_UNKNOWN,
1593 rel, rel_end, h, r_symndx, FALSE))
1596 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1597 if (h == htab->elf.hgot)
1598 htab->got_referenced = TRUE;
1603 htab->tls_ld_or_ldm_got.refcount = 1;
1607 /* This symbol requires a procedure linkage table entry. We
1608 actually build the entry in adjust_dynamic_symbol,
1609 because this might be a case of linking PIC code which is
1610 never referenced by a dynamic object, in which case we
1611 don't need to generate a procedure linkage table entry
1614 /* If this is a local symbol, we resolve it directly without
1615 creating a procedure linkage table entry. */
1619 eh->zero_undefweak &= 0x2;
1621 h->plt.refcount = 1;
1628 case R_386_TLS_IE_32:
1630 case R_386_TLS_GOTIE:
1631 if (!bfd_link_executable (info))
1632 info->flags |= DF_STATIC_TLS;
1638 case R_386_TLS_GOTDESC:
1639 case R_386_TLS_DESC_CALL:
1640 /* This symbol requires a global offset table entry. */
1642 int tls_type, old_tls_type;
1649 tls_type = GOT_NORMAL;
1651 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1652 case R_386_TLS_GOTDESC:
1653 case R_386_TLS_DESC_CALL:
1654 tls_type = GOT_TLS_GDESC; break;
1655 case R_386_TLS_IE_32:
1656 if (ELF32_R_TYPE (rel->r_info) == r_type)
1657 tls_type = GOT_TLS_IE_NEG;
1659 /* If this is a GD->IE transition, we may use either of
1660 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1661 tls_type = GOT_TLS_IE;
1664 case R_386_TLS_GOTIE:
1665 tls_type = GOT_TLS_IE_POS; break;
1670 h->got.refcount = 1;
1671 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1675 bfd_signed_vma *local_got_refcounts;
1677 /* This is a global offset table entry for a local symbol. */
1678 local_got_refcounts = elf_local_got_refcounts (abfd);
1679 if (local_got_refcounts == NULL)
1683 size = symtab_hdr->sh_info;
1684 size *= (sizeof (bfd_signed_vma)
1685 + sizeof (bfd_vma) + sizeof(char));
1686 local_got_refcounts = (bfd_signed_vma *)
1687 bfd_zalloc (abfd, size);
1688 if (local_got_refcounts == NULL)
1690 elf_local_got_refcounts (abfd) = local_got_refcounts;
1691 elf_x86_local_tlsdesc_gotent (abfd)
1692 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1693 elf_x86_local_got_tls_type (abfd)
1694 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1696 local_got_refcounts[r_symndx] = 1;
1697 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1700 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1701 tls_type |= old_tls_type;
1702 /* If a TLS symbol is accessed using IE at least once,
1703 there is no point to use dynamic model for it. */
1704 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1705 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1706 || (tls_type & GOT_TLS_IE) == 0))
1708 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1709 tls_type = old_tls_type;
1710 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1711 && GOT_TLS_GD_ANY_P (tls_type))
1712 tls_type |= old_tls_type;
1716 name = h->root.root.string;
1718 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1721 /* xgettext:c-format */
1722 (_("%pB: `%s' accessed both as normal and "
1723 "thread local symbol"),
1725 bfd_set_error (bfd_error_bad_value);
1730 if (old_tls_type != tls_type)
1733 elf_x86_hash_entry (h)->tls_type = tls_type;
1735 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1743 if (r_type != R_386_TLS_IE)
1747 eh->zero_undefweak &= 0x2;
1749 /* Need GOT to resolve undefined weak symbol to 0. */
1750 if (r_type == R_386_GOTOFF
1751 && h->root.type == bfd_link_hash_undefweak
1752 && bfd_link_executable (info))
1753 htab->got_referenced = TRUE;
1759 case R_386_TLS_LE_32:
1762 eh->zero_undefweak &= 0x2;
1763 if (bfd_link_executable (info))
1765 info->flags |= DF_STATIC_TLS;
1770 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1771 eh->zero_undefweak |= 0x2;
1773 /* We are called after all symbols have been resolved. Only
1774 relocation against STT_GNU_IFUNC symbol must go through
1777 && (bfd_link_executable (info)
1778 || h->type == STT_GNU_IFUNC))
1780 bfd_boolean func_pointer_ref = FALSE;
1782 if (r_type == R_386_PC32)
1784 /* Since something like ".long foo - ." may be used
1785 as pointer, make sure that PLT is used if foo is
1786 a function defined in a shared library. */
1787 if ((sec->flags & SEC_CODE) == 0)
1788 h->pointer_equality_needed = 1;
1789 else if (h->type == STT_GNU_IFUNC
1790 && bfd_link_pic (info))
1793 /* xgettext:c-format */
1794 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1795 abfd, h->root.root.string);
1796 bfd_set_error (bfd_error_bad_value);
1802 h->pointer_equality_needed = 1;
1803 /* R_386_32 can be resolved at run-time. */
1804 if (r_type == R_386_32
1805 && (sec->flags & SEC_READONLY) == 0)
1806 func_pointer_ref = TRUE;
1809 if (!func_pointer_ref)
1811 /* If this reloc is in a read-only section, we might
1812 need a copy reloc. We can't check reliably at this
1813 stage whether the section is read-only, as input
1814 sections have not yet been mapped to output sections.
1815 Tentatively set the flag for now, and correct in
1816 adjust_dynamic_symbol. */
1819 /* We may need a .plt entry if the symbol is a function
1820 defined in a shared lib or is a function referenced
1821 from the code or read-only section. */
1823 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1824 h->plt.refcount = 1;
1830 if (NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type,
1833 struct elf_dyn_relocs *p;
1834 struct elf_dyn_relocs **head;
1836 /* We must copy these reloc types into the output file.
1837 Create a reloc section in dynobj and make room for
1841 sreloc = _bfd_elf_make_dynamic_reloc_section
1842 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1848 /* If this is a global symbol, we count the number of
1849 relocations we need for this symbol. */
1852 head = &eh->dyn_relocs;
1856 /* Track dynamic relocs needed for local syms too.
1857 We really need local syms available to do this
1862 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1867 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1871 vpp = &elf_section_data (s)->local_dynrel;
1872 head = (struct elf_dyn_relocs **)vpp;
1876 if (p == NULL || p->sec != sec)
1878 bfd_size_type amt = sizeof *p;
1879 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1891 /* Count size relocation as PC-relative relocation. */
1892 if (r_type == R_386_PC32 || size_reloc)
1897 /* This relocation describes the C++ object vtable hierarchy.
1898 Reconstruct it for later use during GC. */
1899 case R_386_GNU_VTINHERIT:
1900 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1904 /* This relocation describes which C++ vtable entries are actually
1905 used. Record for later use during GC. */
1906 case R_386_GNU_VTENTRY:
1907 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1916 if (elf_section_data (sec)->this_hdr.contents != contents)
1918 if (!converted && !info->keep_memory)
1922 /* Cache the section contents for elf_link_input_bfd if any
1923 load is converted or --no-keep-memory isn't used. */
1924 elf_section_data (sec)->this_hdr.contents = contents;
1928 /* Cache relocations if any load is converted. */
1929 if (elf_section_data (sec)->relocs != relocs && converted)
1930 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1935 if (elf_section_data (sec)->this_hdr.contents != contents)
1937 sec->check_relocs_failed = 1;
1941 /* Set the correct type for an x86 ELF section. We do this by the
1942 section name, which is a hack, but ought to work. */
1945 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1946 Elf_Internal_Shdr *hdr,
1951 name = bfd_get_section_name (abfd, sec);
1953 /* This is an ugly, but unfortunately necessary hack that is
1954 needed when producing EFI binaries on x86. It tells
1955 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1956 containing ELF relocation info. We need this hack in order to
1957 be able to generate ELF binaries that can be translated into
1958 EFI applications (which are essentially COFF objects). Those
1959 files contain a COFF ".reloc" section inside an ELFNN object,
1960 which would normally cause BFD to segfault because it would
1961 attempt to interpret this section as containing relocation
1962 entries for section "oc". With this hack enabled, ".reloc"
1963 will be treated as a normal data section, which will avoid the
1964 segfault. However, you won't be able to create an ELFNN binary
1965 with a section named "oc" that needs relocations, but that's
1966 the kind of ugly side-effects you get when detecting section
1967 types based on their names... In practice, this limitation is
1968 unlikely to bite. */
1969 if (strcmp (name, ".reloc") == 0)
1970 hdr->sh_type = SHT_PROGBITS;
1975 /* Return the relocation value for @tpoff relocation
1976 if STT_TLS virtual address is ADDRESS. */
1979 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1981 struct elf_link_hash_table *htab = elf_hash_table (info);
1982 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1983 bfd_vma static_tls_size;
1985 /* If tls_sec is NULL, we should have signalled an error already. */
1986 if (htab->tls_sec == NULL)
1989 /* Consider special static TLS alignment requirements. */
1990 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1991 return static_tls_size + htab->tls_sec->vma - address;
1994 /* Relocate an i386 ELF section. */
1997 elf_i386_relocate_section (bfd *output_bfd,
1998 struct bfd_link_info *info,
2000 asection *input_section,
2002 Elf_Internal_Rela *relocs,
2003 Elf_Internal_Sym *local_syms,
2004 asection **local_sections)
2006 struct elf_x86_link_hash_table *htab;
2007 Elf_Internal_Shdr *symtab_hdr;
2008 struct elf_link_hash_entry **sym_hashes;
2009 bfd_vma *local_got_offsets;
2010 bfd_vma *local_tlsdesc_gotents;
2011 Elf_Internal_Rela *rel;
2012 Elf_Internal_Rela *wrel;
2013 Elf_Internal_Rela *relend;
2014 bfd_boolean is_vxworks_tls;
2015 unsigned plt_entry_size;
2017 /* Skip if check_relocs failed. */
2018 if (input_section->check_relocs_failed)
2021 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2025 if (!is_x86_elf (input_bfd, htab))
2027 bfd_set_error (bfd_error_wrong_format);
2031 symtab_hdr = &elf_symtab_hdr (input_bfd);
2032 sym_hashes = elf_sym_hashes (input_bfd);
2033 local_got_offsets = elf_local_got_offsets (input_bfd);
2034 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2035 /* We have to handle relocations in vxworks .tls_vars sections
2036 specially, because the dynamic loader is 'weird'. */
2037 is_vxworks_tls = (htab->target_os == is_vxworks
2038 && bfd_link_pic (info)
2039 && !strcmp (input_section->output_section->name,
2042 _bfd_x86_elf_set_tls_module_base (info);
2044 plt_entry_size = htab->plt.plt_entry_size;
2046 rel = wrel = relocs;
2047 relend = relocs + input_section->reloc_count;
2048 for (; rel < relend; wrel++, rel++)
2050 unsigned int r_type, r_type_tls;
2051 reloc_howto_type *howto;
2052 unsigned long r_symndx;
2053 struct elf_link_hash_entry *h;
2054 struct elf_x86_link_hash_entry *eh;
2055 Elf_Internal_Sym *sym;
2057 bfd_vma off, offplt, plt_offset;
2059 bfd_boolean unresolved_reloc;
2060 bfd_reloc_status_type r;
2064 asection *resolved_plt;
2065 bfd_boolean resolved_to_zero;
2066 bfd_boolean relative_reloc;
2068 r_type = ELF32_R_TYPE (rel->r_info);
2069 if (r_type == R_386_GNU_VTINHERIT
2070 || r_type == R_386_GNU_VTENTRY)
2077 howto = elf_i386_rtype_to_howto (r_type);
2079 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2081 r_symndx = ELF32_R_SYM (rel->r_info);
2085 unresolved_reloc = FALSE;
2086 if (r_symndx < symtab_hdr->sh_info)
2088 sym = local_syms + r_symndx;
2089 sec = local_sections[r_symndx];
2090 relocation = (sec->output_section->vma
2091 + sec->output_offset
2093 st_size = sym->st_size;
2095 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2096 && ((sec->flags & SEC_MERGE) != 0
2097 || (bfd_link_relocatable (info)
2098 && sec->output_offset != 0)))
2101 bfd_byte *where = contents + rel->r_offset;
2103 switch (howto->size)
2106 addend = bfd_get_8 (input_bfd, where);
2107 if (howto->pc_relative)
2109 addend = (addend ^ 0x80) - 0x80;
2114 addend = bfd_get_16 (input_bfd, where);
2115 if (howto->pc_relative)
2117 addend = (addend ^ 0x8000) - 0x8000;
2122 addend = bfd_get_32 (input_bfd, where);
2123 if (howto->pc_relative)
2125 addend = (addend ^ 0x80000000) - 0x80000000;
2133 if (bfd_link_relocatable (info))
2134 addend += sec->output_offset;
2137 asection *msec = sec;
2138 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2140 addend -= relocation;
2141 addend += msec->output_section->vma + msec->output_offset;
2144 switch (howto->size)
2147 /* FIXME: overflow checks. */
2148 if (howto->pc_relative)
2150 bfd_put_8 (input_bfd, addend, where);
2153 if (howto->pc_relative)
2155 bfd_put_16 (input_bfd, addend, where);
2158 if (howto->pc_relative)
2160 bfd_put_32 (input_bfd, addend, where);
2164 else if (!bfd_link_relocatable (info)
2165 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2167 /* Relocate against local STT_GNU_IFUNC symbol. */
2168 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2173 /* Set STT_GNU_IFUNC symbol value. */
2174 h->root.u.def.value = sym->st_value;
2175 h->root.u.def.section = sec;
2180 bfd_boolean warned ATTRIBUTE_UNUSED;
2181 bfd_boolean ignored ATTRIBUTE_UNUSED;
2183 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2184 r_symndx, symtab_hdr, sym_hashes,
2186 unresolved_reloc, warned, ignored);
2190 if (sec != NULL && discarded_section (sec))
2192 _bfd_clear_contents (howto, input_bfd, input_section,
2193 contents, rel->r_offset);
2194 wrel->r_offset = rel->r_offset;
2198 /* For ld -r, remove relocations in debug sections against
2199 sections defined in discarded sections. Not done for
2200 eh_frame editing code expects to be present. */
2201 if (bfd_link_relocatable (info)
2202 && (input_section->flags & SEC_DEBUGGING))
2208 if (bfd_link_relocatable (info))
2215 eh = (struct elf_x86_link_hash_entry *) h;
2217 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2218 it here if it is defined in a non-shared object. */
2220 && h->type == STT_GNU_IFUNC
2223 asection *gotplt, *base_got;
2227 if ((input_section->flags & SEC_ALLOC) == 0)
2229 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2230 STT_GNU_IFUNC symbol as STT_FUNC. */
2231 if (elf_section_type (input_section) == SHT_NOTE)
2233 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2234 sections because such sections are not SEC_ALLOC and
2235 thus ld.so will not process them. */
2236 if ((input_section->flags & SEC_DEBUGGING) != 0)
2241 /* STT_GNU_IFUNC symbol must go through PLT. */
2242 if (htab->elf.splt != NULL)
2244 if (htab->plt_second != NULL)
2246 resolved_plt = htab->plt_second;
2247 plt_offset = eh->plt_second.offset;
2251 resolved_plt = htab->elf.splt;
2252 plt_offset = h->plt.offset;
2254 gotplt = htab->elf.sgotplt;
2258 resolved_plt = htab->elf.iplt;
2259 plt_offset = h->plt.offset;
2260 gotplt = htab->elf.igotplt;
2270 base_got = htab->elf.sgot;
2271 off = h->got.offset;
2273 if (base_got == NULL)
2276 if (off == (bfd_vma) -1)
2278 /* We can't use h->got.offset here to save state, or
2279 even just remember the offset, as finish_dynamic_symbol
2280 would use that as offset into .got. */
2282 if (h->plt.offset == (bfd_vma) -1)
2285 if (htab->elf.splt != NULL)
2287 plt_index = (h->plt.offset / plt_entry_size
2288 - htab->plt.has_plt0);
2289 off = (plt_index + 3) * 4;
2290 base_got = htab->elf.sgotplt;
2294 plt_index = h->plt.offset / plt_entry_size;
2295 off = plt_index * 4;
2296 base_got = htab->elf.igotplt;
2299 if (h->dynindx == -1
2303 /* This references the local defitionion. We must
2304 initialize this entry in the global offset table.
2305 Since the offset must always be a multiple of 8,
2306 we use the least significant bit to record
2307 whether we have initialized it already.
2309 When doing a dynamic link, we create a .rela.got
2310 relocation entry to initialize the value. This
2311 is done in the finish_dynamic_symbol routine. */
2316 bfd_put_32 (output_bfd, relocation,
2317 base_got->contents + off);
2325 relocation = (base_got->output_section->vma
2326 + base_got->output_offset + off
2327 - gotplt->output_section->vma
2328 - gotplt->output_offset);
2330 if (rel->r_offset > 1
2331 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2332 && *(contents + rel->r_offset - 2) != 0x8d)
2334 if (bfd_link_pic (info))
2335 goto disallow_got32;
2337 /* Add the GOT base if there is no base register. */
2338 relocation += (gotplt->output_section->vma
2339 + gotplt->output_offset);
2341 else if (htab->elf.splt == NULL)
2343 /* Adjust for static executables. */
2344 relocation += gotplt->output_offset;
2350 if (h->plt.offset == (bfd_vma) -1)
2352 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2353 if (r_type == R_386_32
2354 && (input_section->flags & SEC_CODE) == 0)
2355 goto do_ifunc_pointer;
2356 goto bad_ifunc_reloc;
2359 relocation = (resolved_plt->output_section->vma
2360 + resolved_plt->output_offset + plt_offset);
2366 if (h->root.root.string)
2367 name = h->root.root.string;
2369 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2372 /* xgettext:c-format */
2373 (_("%pB: relocation %s against STT_GNU_IFUNC "
2374 "symbol `%s' isn't supported"), input_bfd,
2376 bfd_set_error (bfd_error_bad_value);
2380 /* Generate dynamic relcoation only when there is a
2381 non-GOT reference in a shared object. */
2382 if ((bfd_link_pic (info) && h->non_got_ref)
2383 || h->plt.offset == (bfd_vma) -1)
2385 Elf_Internal_Rela outrel;
2390 /* Need a dynamic relocation to get the real function
2392 offset = _bfd_elf_section_offset (output_bfd,
2396 if (offset == (bfd_vma) -1
2397 || offset == (bfd_vma) -2)
2400 outrel.r_offset = (input_section->output_section->vma
2401 + input_section->output_offset
2404 if (POINTER_LOCAL_IFUNC_P (info, h))
2406 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2407 h->root.root.string,
2408 h->root.u.def.section->owner);
2410 /* This symbol is resolved locally. */
2411 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2412 bfd_put_32 (output_bfd,
2413 (h->root.u.def.value
2414 + h->root.u.def.section->output_section->vma
2415 + h->root.u.def.section->output_offset),
2419 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2421 /* Dynamic relocations are stored in
2422 1. .rel.ifunc section in PIC object.
2423 2. .rel.got section in dynamic executable.
2424 3. .rel.iplt section in static executable. */
2425 if (bfd_link_pic (info))
2426 sreloc = htab->elf.irelifunc;
2427 else if (htab->elf.splt != NULL)
2428 sreloc = htab->elf.srelgot;
2430 sreloc = htab->elf.irelplt;
2431 elf_append_rel (output_bfd, sreloc, &outrel);
2433 /* If this reloc is against an external symbol, we
2434 do not want to fiddle with the addend. Otherwise,
2435 we need to include the symbol value so that it
2436 becomes an addend for the dynamic reloc. For an
2437 internal symbol, we have updated addend. */
2446 relocation -= (gotplt->output_section->vma
2447 + gotplt->output_offset);
2453 resolved_to_zero = (eh != NULL
2454 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2460 /* Relocation is to the entry for this symbol in the global
2462 if (htab->elf.sgot == NULL)
2465 relative_reloc = FALSE;
2468 off = h->got.offset;
2469 if (RESOLVED_LOCALLY_P (info, h, htab))
2471 /* We must initialize this entry in the global offset
2472 table. Since the offset must always be a multiple
2473 of 4, we use the least significant bit to record
2474 whether we have initialized it already.
2476 When doing a dynamic link, we create a .rel.got
2477 relocation entry to initialize the value. This
2478 is done in the finish_dynamic_symbol routine. */
2483 bfd_put_32 (output_bfd, relocation,
2484 htab->elf.sgot->contents + off);
2487 if (GENERATE_RELATIVE_RELOC_P (info, h))
2489 /* PR ld/21402: If this symbol isn't dynamic
2490 in PIC, generate R_386_RELATIVE here. */
2491 eh->no_finish_dynamic_symbol = 1;
2492 relative_reloc = TRUE;
2497 unresolved_reloc = FALSE;
2501 if (local_got_offsets == NULL)
2504 off = local_got_offsets[r_symndx];
2506 /* The offset must always be a multiple of 4. We use
2507 the least significant bit to record whether we have
2508 already generated the necessary reloc. */
2513 bfd_put_32 (output_bfd, relocation,
2514 htab->elf.sgot->contents + off);
2515 local_got_offsets[r_symndx] |= 1;
2517 if (bfd_link_pic (info))
2518 relative_reloc = TRUE;
2525 Elf_Internal_Rela outrel;
2527 s = htab->elf.srelgot;
2531 outrel.r_offset = (htab->elf.sgot->output_section->vma
2532 + htab->elf.sgot->output_offset
2534 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2535 elf_append_rel (output_bfd, s, &outrel);
2538 if (off >= (bfd_vma) -2)
2541 relocation = (htab->elf.sgot->output_section->vma
2542 + htab->elf.sgot->output_offset + off);
2543 if (rel->r_offset > 1
2544 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2545 && *(contents + rel->r_offset - 2) != 0x8d)
2547 if (bfd_link_pic (info))
2549 /* For PIC, disallow R_386_GOT32 without a base
2550 register, except for "lea foo@GOT, %reg", since
2551 we don't know what the GOT base is. */
2555 if (h == NULL || h->root.root.string == NULL)
2556 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2559 name = h->root.root.string;
2562 /* xgettext:c-format */
2563 (_("%pB: direct GOT relocation %s against `%s'"
2564 " without base register can not be used"
2565 " when making a shared object"),
2566 input_bfd, howto->name, name);
2567 bfd_set_error (bfd_error_bad_value);
2573 /* Subtract the .got.plt section address only with a base
2575 relocation -= (htab->elf.sgotplt->output_section->vma
2576 + htab->elf.sgotplt->output_offset);
2582 /* Relocation is relative to the start of the global offset
2585 /* Check to make sure it isn't a protected function or data
2586 symbol for shared library since it may not be local when
2587 used as function address or with copy relocation. We also
2588 need to make sure that a symbol is referenced locally. */
2589 if (!bfd_link_executable (info) && h)
2591 if (!h->def_regular)
2595 switch (ELF_ST_VISIBILITY (h->other))
2598 v = _("hidden symbol");
2601 v = _("internal symbol");
2604 v = _("protected symbol");
2612 /* xgettext:c-format */
2613 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2614 " `%s' can not be used when making a shared object"),
2615 input_bfd, v, h->root.root.string);
2616 bfd_set_error (bfd_error_bad_value);
2619 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2620 && (h->type == STT_FUNC
2621 || h->type == STT_OBJECT)
2622 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2625 /* xgettext:c-format */
2626 (_("%pB: relocation R_386_GOTOFF against protected %s"
2627 " `%s' can not be used when making a shared object"),
2629 h->type == STT_FUNC ? "function" : "data",
2630 h->root.root.string);
2631 bfd_set_error (bfd_error_bad_value);
2636 /* Note that sgot is not involved in this
2637 calculation. We always want the start of .got.plt. If we
2638 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2639 permitted by the ABI, we might have to change this
2641 relocation -= htab->elf.sgotplt->output_section->vma
2642 + htab->elf.sgotplt->output_offset;
2646 /* Use global offset table as symbol value. */
2647 relocation = htab->elf.sgotplt->output_section->vma
2648 + htab->elf.sgotplt->output_offset;
2649 unresolved_reloc = FALSE;
2653 /* Relocation is to the entry for this symbol in the
2654 procedure linkage table. */
2656 /* Resolve a PLT32 reloc against a local symbol directly,
2657 without using the procedure linkage table. */
2661 if ((h->plt.offset == (bfd_vma) -1
2662 && eh->plt_got.offset == (bfd_vma) -1)
2663 || htab->elf.splt == NULL)
2665 /* We didn't make a PLT entry for this symbol. This
2666 happens when statically linking PIC code, or when
2667 using -Bsymbolic. */
2671 if (h->plt.offset != (bfd_vma) -1)
2673 if (htab->plt_second != NULL)
2675 resolved_plt = htab->plt_second;
2676 plt_offset = eh->plt_second.offset;
2680 resolved_plt = htab->elf.splt;
2681 plt_offset = h->plt.offset;
2686 resolved_plt = htab->plt_got;
2687 plt_offset = eh->plt_got.offset;
2690 relocation = (resolved_plt->output_section->vma
2691 + resolved_plt->output_offset
2693 unresolved_reloc = FALSE;
2697 /* Set to symbol size. */
2698 relocation = st_size;
2703 if ((input_section->flags & SEC_ALLOC) == 0
2707 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2708 FALSE, resolved_to_zero,
2709 (r_type == R_386_PC32)))
2711 Elf_Internal_Rela outrel;
2712 bfd_boolean skip, relocate;
2715 /* When generating a shared object, these relocations
2716 are copied into the output file to be resolved at run
2723 _bfd_elf_section_offset (output_bfd, info, input_section,
2725 if (outrel.r_offset == (bfd_vma) -1)
2727 else if (outrel.r_offset == (bfd_vma) -2)
2728 skip = TRUE, relocate = TRUE;
2729 outrel.r_offset += (input_section->output_section->vma
2730 + input_section->output_offset);
2733 memset (&outrel, 0, sizeof outrel);
2734 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2735 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2738 /* This symbol is local, or marked to become local. */
2740 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2743 sreloc = elf_section_data (input_section)->sreloc;
2745 if (sreloc == NULL || sreloc->contents == NULL)
2747 r = bfd_reloc_notsupported;
2748 goto check_relocation_error;
2751 elf_append_rel (output_bfd, sreloc, &outrel);
2753 /* If this reloc is against an external symbol, we do
2754 not want to fiddle with the addend. Otherwise, we
2755 need to include the symbol value so that it becomes
2756 an addend for the dynamic reloc. */
2763 if (!bfd_link_executable (info))
2765 Elf_Internal_Rela outrel;
2768 outrel.r_offset = rel->r_offset
2769 + input_section->output_section->vma
2770 + input_section->output_offset;
2771 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2772 sreloc = elf_section_data (input_section)->sreloc;
2775 elf_append_rel (output_bfd, sreloc, &outrel);
2780 case R_386_TLS_GOTDESC:
2781 case R_386_TLS_DESC_CALL:
2782 case R_386_TLS_IE_32:
2783 case R_386_TLS_GOTIE:
2784 tls_type = GOT_UNKNOWN;
2785 if (h == NULL && local_got_offsets)
2786 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2788 tls_type = elf_x86_hash_entry(h)->tls_type;
2789 if (tls_type == GOT_TLS_IE)
2790 tls_type = GOT_TLS_IE_NEG;
2792 r_type_tls = r_type;
2793 if (! elf_i386_tls_transition (info, input_bfd,
2794 input_section, contents,
2795 symtab_hdr, sym_hashes,
2796 &r_type_tls, tls_type, rel,
2797 relend, h, r_symndx, TRUE))
2800 if (r_type_tls == R_386_TLS_LE_32)
2802 BFD_ASSERT (! unresolved_reloc);
2803 if (r_type == R_386_TLS_GD)
2808 /* GD->LE transition. */
2809 type = *(contents + rel->r_offset - 2);
2813 leal foo@tlsgd(,%ebx,1), %eax
2814 call ___tls_get_addr@PLT
2817 subl $foo@tpoff, %eax
2818 (6 byte form of subl). */
2819 roff = rel->r_offset + 5;
2824 leal foo@tlsgd(%ebx), %eax
2825 call ___tls_get_addr@PLT
2828 leal foo@tlsgd(%reg), %eax
2829 call *___tls_get_addr@GOT(%reg)
2830 which may be converted to
2831 addr32 call ___tls_get_addr
2833 movl %gs:0, %eax; subl $foo@tpoff, %eax
2834 (6 byte form of subl). */
2835 roff = rel->r_offset + 6;
2837 memcpy (contents + roff - 8,
2838 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2839 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2841 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2846 else if (r_type == R_386_TLS_GOTDESC)
2848 /* GDesc -> LE transition.
2849 It's originally something like:
2850 leal x@tlsdesc(%ebx), %eax
2854 Registers other than %eax may be set up here. */
2859 roff = rel->r_offset;
2860 val = bfd_get_8 (input_bfd, contents + roff - 1);
2862 /* Now modify the instruction as appropriate. */
2863 /* aoliva FIXME: remove the above and xor the byte
2865 bfd_put_8 (output_bfd, val ^ 0x86,
2866 contents + roff - 1);
2867 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2871 else if (r_type == R_386_TLS_DESC_CALL)
2873 /* GDesc -> LE transition.
2881 roff = rel->r_offset;
2882 bfd_put_8 (output_bfd, 0x66, contents + roff);
2883 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2886 else if (r_type == R_386_TLS_IE)
2890 /* IE->LE transition:
2891 Originally it can be one of:
2899 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2902 /* movl foo, %eax. */
2903 bfd_put_8 (output_bfd, 0xb8,
2904 contents + rel->r_offset - 1);
2910 type = bfd_get_8 (input_bfd,
2911 contents + rel->r_offset - 2);
2916 bfd_put_8 (output_bfd, 0xc7,
2917 contents + rel->r_offset - 2);
2918 bfd_put_8 (output_bfd,
2919 0xc0 | ((val >> 3) & 7),
2920 contents + rel->r_offset - 1);
2924 bfd_put_8 (output_bfd, 0x81,
2925 contents + rel->r_offset - 2);
2926 bfd_put_8 (output_bfd,
2927 0xc0 | ((val >> 3) & 7),
2928 contents + rel->r_offset - 1);
2935 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2936 contents + rel->r_offset);
2941 unsigned int val, type;
2943 /* {IE_32,GOTIE}->LE transition:
2944 Originally it can be one of:
2945 subl foo(%reg1), %reg2
2946 movl foo(%reg1), %reg2
2947 addl foo(%reg1), %reg2
2950 movl $foo, %reg2 (6 byte form)
2951 addl $foo, %reg2. */
2952 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2953 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2957 bfd_put_8 (output_bfd, 0xc7,
2958 contents + rel->r_offset - 2);
2959 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2960 contents + rel->r_offset - 1);
2962 else if (type == 0x2b)
2965 bfd_put_8 (output_bfd, 0x81,
2966 contents + rel->r_offset - 2);
2967 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2968 contents + rel->r_offset - 1);
2970 else if (type == 0x03)
2973 bfd_put_8 (output_bfd, 0x81,
2974 contents + rel->r_offset - 2);
2975 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2976 contents + rel->r_offset - 1);
2980 if (r_type == R_386_TLS_GOTIE)
2981 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2982 contents + rel->r_offset);
2984 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2985 contents + rel->r_offset);
2990 if (htab->elf.sgot == NULL)
2995 off = h->got.offset;
2996 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3000 if (local_got_offsets == NULL)
3003 off = local_got_offsets[r_symndx];
3004 offplt = local_tlsdesc_gotents[r_symndx];
3011 Elf_Internal_Rela outrel;
3015 if (htab->elf.srelgot == NULL)
3018 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3020 if (GOT_TLS_GDESC_P (tls_type))
3023 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3024 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3025 <= htab->elf.sgotplt->size);
3026 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3027 + htab->elf.sgotplt->output_offset
3029 + htab->sgotplt_jump_table_size);
3030 sreloc = htab->elf.srelplt;
3031 loc = sreloc->contents;
3032 loc += (htab->next_tls_desc_index++
3033 * sizeof (Elf32_External_Rel));
3034 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3035 <= sreloc->contents + sreloc->size);
3036 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3039 BFD_ASSERT (! unresolved_reloc);
3040 bfd_put_32 (output_bfd,
3041 relocation - _bfd_x86_elf_dtpoff_base (info),
3042 htab->elf.sgotplt->contents + offplt
3043 + htab->sgotplt_jump_table_size + 4);
3047 bfd_put_32 (output_bfd, 0,
3048 htab->elf.sgotplt->contents + offplt
3049 + htab->sgotplt_jump_table_size + 4);
3053 sreloc = htab->elf.srelgot;
3055 outrel.r_offset = (htab->elf.sgot->output_section->vma
3056 + htab->elf.sgot->output_offset + off);
3058 if (GOT_TLS_GD_P (tls_type))
3059 dr_type = R_386_TLS_DTPMOD32;
3060 else if (GOT_TLS_GDESC_P (tls_type))
3062 else if (tls_type == GOT_TLS_IE_POS)
3063 dr_type = R_386_TLS_TPOFF;
3065 dr_type = R_386_TLS_TPOFF32;
3067 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3068 bfd_put_32 (output_bfd,
3069 relocation - _bfd_x86_elf_dtpoff_base (info),
3070 htab->elf.sgot->contents + off);
3071 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3072 bfd_put_32 (output_bfd,
3073 _bfd_x86_elf_dtpoff_base (info) - relocation,
3074 htab->elf.sgot->contents + off);
3075 else if (dr_type != R_386_TLS_DESC)
3076 bfd_put_32 (output_bfd, 0,
3077 htab->elf.sgot->contents + off);
3078 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3080 elf_append_rel (output_bfd, sreloc, &outrel);
3082 if (GOT_TLS_GD_P (tls_type))
3086 BFD_ASSERT (! unresolved_reloc);
3087 bfd_put_32 (output_bfd,
3088 relocation - _bfd_x86_elf_dtpoff_base (info),
3089 htab->elf.sgot->contents + off + 4);
3093 bfd_put_32 (output_bfd, 0,
3094 htab->elf.sgot->contents + off + 4);
3095 outrel.r_info = ELF32_R_INFO (indx,
3096 R_386_TLS_DTPOFF32);
3097 outrel.r_offset += 4;
3098 elf_append_rel (output_bfd, sreloc, &outrel);
3101 else if (tls_type == GOT_TLS_IE_BOTH)
3103 bfd_put_32 (output_bfd,
3105 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3107 htab->elf.sgot->contents + off + 4);
3108 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3109 outrel.r_offset += 4;
3110 elf_append_rel (output_bfd, sreloc, &outrel);
3117 local_got_offsets[r_symndx] |= 1;
3120 if (off >= (bfd_vma) -2
3121 && ! GOT_TLS_GDESC_P (tls_type))
3123 if (r_type_tls == R_386_TLS_GOTDESC
3124 || r_type_tls == R_386_TLS_DESC_CALL)
3126 relocation = htab->sgotplt_jump_table_size + offplt;
3127 unresolved_reloc = FALSE;
3129 else if (r_type_tls == r_type)
3131 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3132 + htab->elf.sgotplt->output_offset;
3133 relocation = htab->elf.sgot->output_section->vma
3134 + htab->elf.sgot->output_offset + off - g_o_t;
3135 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3136 && tls_type == GOT_TLS_IE_BOTH)
3138 if (r_type == R_386_TLS_IE)
3139 relocation += g_o_t;
3140 unresolved_reloc = FALSE;
3142 else if (r_type == R_386_TLS_GD)
3144 unsigned int val, type;
3147 /* GD->IE transition. */
3148 type = *(contents + rel->r_offset - 2);
3149 val = *(contents + rel->r_offset - 1);
3153 leal foo@tlsgd(,%ebx,1), %eax
3154 call ___tls_get_addr@PLT
3157 subl $foo@gottpoff(%ebx), %eax. */
3159 roff = rel->r_offset - 3;
3164 leal foo@tlsgd(%ebx), %eax
3165 call ___tls_get_addr@PLT
3168 leal foo@tlsgd(%reg), %eax
3169 call *___tls_get_addr@GOT(%reg)
3170 which may be converted to
3171 addr32 call ___tls_get_addr
3174 subl $foo@gottpoff(%reg), %eax. */
3175 roff = rel->r_offset - 2;
3177 memcpy (contents + roff,
3178 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3179 contents[roff + 7] = 0x80 | (val & 7);
3180 /* If foo is used only with foo@gotntpoff(%reg) and
3181 foo@indntpoff, but not with foo@gottpoff(%reg), change
3182 subl $foo@gottpoff(%reg), %eax
3184 addl $foo@gotntpoff(%reg), %eax. */
3185 if (tls_type == GOT_TLS_IE_POS)
3186 contents[roff + 6] = 0x03;
3187 bfd_put_32 (output_bfd,
3188 htab->elf.sgot->output_section->vma
3189 + htab->elf.sgot->output_offset + off
3190 - htab->elf.sgotplt->output_section->vma
3191 - htab->elf.sgotplt->output_offset,
3192 contents + roff + 8);
3193 /* Skip R_386_PLT32 and R_386_GOT32X. */
3198 else if (r_type == R_386_TLS_GOTDESC)
3200 /* GDesc -> IE transition.
3201 It's originally something like:
3202 leal x@tlsdesc(%ebx), %eax
3205 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3207 movl x@gottpoff(%ebx), %eax # before negl %eax
3209 Registers other than %eax may be set up here. */
3213 /* First, make sure it's a leal adding ebx to a 32-bit
3214 offset into any register, although it's probably
3215 almost always going to be eax. */
3216 roff = rel->r_offset;
3218 /* Now modify the instruction as appropriate. */
3219 /* To turn a leal into a movl in the form we use it, it
3220 suffices to change the first byte from 0x8d to 0x8b.
3221 aoliva FIXME: should we decide to keep the leal, all
3222 we have to do is remove the statement below, and
3223 adjust the relaxation of R_386_TLS_DESC_CALL. */
3224 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3226 if (tls_type == GOT_TLS_IE_BOTH)
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,
3237 else if (r_type == R_386_TLS_DESC_CALL)
3239 /* GDesc -> IE transition.
3247 depending on how we transformed the TLS_GOTDESC above.
3252 roff = rel->r_offset;
3254 /* Now modify the instruction as appropriate. */
3255 if (tls_type != GOT_TLS_IE_NEG)
3258 bfd_put_8 (output_bfd, 0x66, contents + roff);
3259 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3264 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3265 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3275 if (! elf_i386_tls_transition (info, input_bfd,
3276 input_section, contents,
3277 symtab_hdr, sym_hashes,
3278 &r_type, GOT_UNKNOWN, rel,
3279 relend, h, r_symndx, TRUE))
3282 if (r_type != R_386_TLS_LDM)
3284 /* LD->LE transition. Change
3285 leal foo@tlsldm(%ebx) %eax
3286 call ___tls_get_addr@PLT
3290 leal 0(%esi,1), %esi
3292 leal foo@tlsldm(%reg) %eax
3293 call *___tls_get_addr@GOT(%reg)
3294 which may be converted to
3295 addr32 call ___tls_get_addr
3298 leal 0(%esi), %esi */
3299 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3300 if (*(contents + rel->r_offset + 4) == 0xff
3301 || *(contents + rel->r_offset + 4) == 0x67)
3302 memcpy (contents + rel->r_offset - 2,
3303 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3305 memcpy (contents + rel->r_offset - 2,
3306 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3307 /* Skip R_386_PC32/R_386_PLT32. */
3313 if (htab->elf.sgot == NULL)
3316 off = htab->tls_ld_or_ldm_got.offset;
3321 Elf_Internal_Rela outrel;
3323 if (htab->elf.srelgot == NULL)
3326 outrel.r_offset = (htab->elf.sgot->output_section->vma
3327 + htab->elf.sgot->output_offset + off);
3329 bfd_put_32 (output_bfd, 0,
3330 htab->elf.sgot->contents + off);
3331 bfd_put_32 (output_bfd, 0,
3332 htab->elf.sgot->contents + off + 4);
3333 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3334 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3335 htab->tls_ld_or_ldm_got.offset |= 1;
3337 relocation = htab->elf.sgot->output_section->vma
3338 + htab->elf.sgot->output_offset + off
3339 - htab->elf.sgotplt->output_section->vma
3340 - htab->elf.sgotplt->output_offset;
3341 unresolved_reloc = FALSE;
3344 case R_386_TLS_LDO_32:
3345 if (!bfd_link_executable (info)
3346 || (input_section->flags & SEC_CODE) == 0)
3347 relocation -= _bfd_x86_elf_dtpoff_base (info);
3349 /* When converting LDO to LE, we must negate. */
3350 relocation = -elf_i386_tpoff (info, relocation);
3353 case R_386_TLS_LE_32:
3355 if (!bfd_link_executable (info))
3357 Elf_Internal_Rela outrel;
3360 outrel.r_offset = rel->r_offset
3361 + input_section->output_section->vma
3362 + input_section->output_offset;
3363 if (h != NULL && h->dynindx != -1)
3367 if (r_type == R_386_TLS_LE_32)
3368 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3370 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3371 sreloc = elf_section_data (input_section)->sreloc;
3374 elf_append_rel (output_bfd, sreloc, &outrel);
3377 else if (r_type == R_386_TLS_LE_32)
3378 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3380 relocation -= _bfd_x86_elf_dtpoff_base (info);
3382 else if (r_type == R_386_TLS_LE_32)
3383 relocation = elf_i386_tpoff (info, relocation);
3385 relocation = -elf_i386_tpoff (info, relocation);
3392 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3393 because such sections are not SEC_ALLOC and thus ld.so will
3394 not process them. */
3395 if (unresolved_reloc
3396 && !((input_section->flags & SEC_DEBUGGING) != 0
3398 && _bfd_elf_section_offset (output_bfd, info, input_section,
3399 rel->r_offset) != (bfd_vma) -1)
3402 /* xgettext:c-format */
3403 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3406 (uint64_t) rel->r_offset,
3408 h->root.root.string);
3413 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3414 contents, rel->r_offset,
3417 check_relocation_error:
3418 if (r != bfd_reloc_ok)
3423 name = h->root.root.string;
3426 name = bfd_elf_string_from_elf_section (input_bfd,
3427 symtab_hdr->sh_link,
3432 name = bfd_section_name (input_bfd, sec);
3435 if (r == bfd_reloc_overflow)
3436 (*info->callbacks->reloc_overflow)
3437 (info, (h ? &h->root : NULL), name, howto->name,
3438 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3442 /* xgettext:c-format */
3443 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3444 input_bfd, input_section,
3445 (uint64_t) rel->r_offset, name, (int) r);
3456 Elf_Internal_Shdr *rel_hdr;
3457 size_t deleted = rel - wrel;
3459 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3460 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3461 if (rel_hdr->sh_size == 0)
3463 /* It is too late to remove an empty reloc section. Leave
3465 ??? What is wrong with an empty section??? */
3466 rel_hdr->sh_size = rel_hdr->sh_entsize;
3469 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3470 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3471 input_section->reloc_count -= deleted;
3477 /* Finish up dynamic symbol handling. We set the contents of various
3478 dynamic sections here. */
3481 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3482 struct bfd_link_info *info,
3483 struct elf_link_hash_entry *h,
3484 Elf_Internal_Sym *sym)
3486 struct elf_x86_link_hash_table *htab;
3487 unsigned plt_entry_size;
3488 struct elf_x86_link_hash_entry *eh;
3489 bfd_boolean local_undefweak;
3490 bfd_boolean use_plt_second;
3492 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3496 plt_entry_size = htab->plt.plt_entry_size;
3498 /* Use the second PLT section only if there is .plt section. */
3499 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3501 eh = (struct elf_x86_link_hash_entry *) h;
3502 if (eh->no_finish_dynamic_symbol)
3505 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3506 resolved undefined weak symbols in executable so that their
3507 references have value 0 at run-time. */
3508 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3510 if (h->plt.offset != (bfd_vma) -1)
3512 bfd_vma plt_index, plt_offset;
3514 Elf_Internal_Rela rel;
3516 asection *plt, *resolved_plt, *gotplt, *relplt;
3518 /* When building a static executable, use .iplt, .igot.plt and
3519 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3520 if (htab->elf.splt != NULL)
3522 plt = htab->elf.splt;
3523 gotplt = htab->elf.sgotplt;
3524 relplt = htab->elf.srelplt;
3528 plt = htab->elf.iplt;
3529 gotplt = htab->elf.igotplt;
3530 relplt = htab->elf.irelplt;
3533 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3535 /* Get the index in the procedure linkage table which
3536 corresponds to this symbol. This is the index of this symbol
3537 in all the symbols for which we are making plt entries. The
3538 first entry in the procedure linkage table is reserved.
3540 Get the offset into the .got table of the entry that
3541 corresponds to this function. Each .got entry is 4 bytes.
3542 The first three are reserved.
3544 For static executables, we don't reserve anything. */
3546 if (plt == htab->elf.splt)
3548 got_offset = (h->plt.offset / plt_entry_size
3549 - htab->plt.has_plt0);
3550 got_offset = (got_offset + 3) * 4;
3554 got_offset = h->plt.offset / plt_entry_size;
3555 got_offset = got_offset * 4;
3558 /* Fill in the entry in the procedure linkage table and update
3560 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3565 const bfd_byte *plt_entry;
3566 if (bfd_link_pic (info))
3567 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3569 plt_entry = htab->non_lazy_plt->plt_entry;
3570 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3571 plt_entry, htab->non_lazy_plt->plt_entry_size);
3573 resolved_plt = htab->plt_second;
3574 plt_offset = eh->plt_second.offset;
3579 plt_offset = h->plt.offset;
3582 if (! bfd_link_pic (info))
3584 bfd_put_32 (output_bfd,
3585 (gotplt->output_section->vma
3586 + gotplt->output_offset
3588 resolved_plt->contents + plt_offset
3589 + htab->plt.plt_got_offset);
3591 if (htab->target_os == is_vxworks)
3593 int s, k, reloc_index;
3595 /* Create the R_386_32 relocation referencing the GOT
3596 for this PLT entry. */
3598 /* S: Current slot number (zero-based). */
3599 s = ((h->plt.offset - htab->plt.plt_entry_size)
3600 / htab->plt.plt_entry_size);
3601 /* K: Number of relocations for PLTResolve. */
3602 if (bfd_link_pic (info))
3603 k = PLTRESOLVE_RELOCS_SHLIB;
3605 k = PLTRESOLVE_RELOCS;
3606 /* Skip the PLTresolve relocations, and the relocations for
3607 the other PLT slots. */
3608 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3609 loc = (htab->srelplt2->contents + reloc_index
3610 * sizeof (Elf32_External_Rel));
3612 rel.r_offset = (plt->output_section->vma
3613 + plt->output_offset
3614 + h->plt.offset + 2),
3615 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3616 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3618 /* Create the R_386_32 relocation referencing the beginning of
3619 the PLT for this GOT entry. */
3620 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3621 + htab->elf.sgotplt->output_offset
3623 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3624 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3625 loc + sizeof (Elf32_External_Rel));
3630 bfd_put_32 (output_bfd, got_offset,
3631 resolved_plt->contents + plt_offset
3632 + htab->plt.plt_got_offset);
3635 /* Fill in the entry in the global offset table. Leave the entry
3636 as zero for undefined weak symbol in PIE. No PLT relocation
3637 against undefined weak symbol in PIE. */
3638 if (!local_undefweak)
3640 if (htab->plt.has_plt0)
3641 bfd_put_32 (output_bfd,
3642 (plt->output_section->vma
3643 + plt->output_offset
3645 + htab->lazy_plt->plt_lazy_offset),
3646 gotplt->contents + got_offset);
3648 /* Fill in the entry in the .rel.plt section. */
3649 rel.r_offset = (gotplt->output_section->vma
3650 + gotplt->output_offset
3652 if (PLT_LOCAL_IFUNC_P (info, h))
3654 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3655 h->root.root.string,
3656 h->root.u.def.section->owner);
3658 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3659 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3660 in the .got.plt section. */
3661 bfd_put_32 (output_bfd,
3662 (h->root.u.def.value
3663 + h->root.u.def.section->output_section->vma
3664 + h->root.u.def.section->output_offset),
3665 gotplt->contents + got_offset);
3666 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3667 /* R_386_IRELATIVE comes last. */
3668 plt_index = htab->next_irelative_index--;
3672 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3673 plt_index = htab->next_jump_slot_index++;
3676 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3677 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3679 /* Don't fill the second and third slots in PLT entry for
3680 static executables nor without PLT0. */
3681 if (plt == htab->elf.splt && htab->plt.has_plt0)
3683 bfd_put_32 (output_bfd,
3684 plt_index * sizeof (Elf32_External_Rel),
3685 plt->contents + h->plt.offset
3686 + htab->lazy_plt->plt_reloc_offset);
3687 bfd_put_32 (output_bfd,
3689 + htab->lazy_plt->plt_plt_offset + 4),
3690 (plt->contents + h->plt.offset
3691 + htab->lazy_plt->plt_plt_offset));
3695 else if (eh->plt_got.offset != (bfd_vma) -1)
3697 bfd_vma got_offset, plt_offset;
3698 asection *plt, *got, *gotplt;
3699 const bfd_byte *got_plt_entry;
3701 /* Set the entry in the GOT procedure linkage table. */
3702 plt = htab->plt_got;
3703 got = htab->elf.sgot;
3704 gotplt = htab->elf.sgotplt;
3705 got_offset = h->got.offset;
3707 if (got_offset == (bfd_vma) -1
3713 /* Fill in the entry in the GOT procedure linkage table. */
3714 if (! bfd_link_pic (info))
3716 got_plt_entry = htab->non_lazy_plt->plt_entry;
3717 got_offset += got->output_section->vma + got->output_offset;
3721 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3722 got_offset += (got->output_section->vma
3723 + got->output_offset
3724 - gotplt->output_section->vma
3725 - gotplt->output_offset);
3728 plt_offset = eh->plt_got.offset;
3729 memcpy (plt->contents + plt_offset, got_plt_entry,
3730 htab->non_lazy_plt->plt_entry_size);
3731 bfd_put_32 (output_bfd, got_offset,
3732 (plt->contents + plt_offset
3733 + htab->non_lazy_plt->plt_got_offset));
3736 if (!local_undefweak
3738 && (h->plt.offset != (bfd_vma) -1
3739 || eh->plt_got.offset != (bfd_vma) -1))
3741 /* Mark the symbol as undefined, rather than as defined in
3742 the .plt section. Leave the value if there were any
3743 relocations where pointer equality matters (this is a clue
3744 for the dynamic linker, to make function pointer
3745 comparisons work between an application and shared
3746 library), otherwise set it to zero. If a function is only
3747 called from a binary, there is no need to slow down
3748 shared libraries because of that. */
3749 sym->st_shndx = SHN_UNDEF;
3750 if (!h->pointer_equality_needed)
3754 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3756 /* Don't generate dynamic GOT relocation against undefined weak
3757 symbol in executable. */
3758 if (h->got.offset != (bfd_vma) -1
3759 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3760 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3761 && !local_undefweak)
3763 Elf_Internal_Rela rel;
3764 asection *relgot = htab->elf.srelgot;
3766 /* This symbol has an entry in the global offset table. Set it
3769 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3772 rel.r_offset = (htab->elf.sgot->output_section->vma
3773 + htab->elf.sgot->output_offset
3774 + (h->got.offset & ~(bfd_vma) 1));
3776 /* If this is a static link, or it is a -Bsymbolic link and the
3777 symbol is defined locally or was forced to be local because
3778 of a version file, we just want to emit a RELATIVE reloc.
3779 The entry in the global offset table will already have been
3780 initialized in the relocate_section function. */
3782 && h->type == STT_GNU_IFUNC)
3784 if (h->plt.offset == (bfd_vma) -1)
3786 /* STT_GNU_IFUNC is referenced without PLT. */
3787 if (htab->elf.splt == NULL)
3789 /* use .rel[a].iplt section to store .got relocations
3790 in static executable. */
3791 relgot = htab->elf.irelplt;
3793 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3795 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3796 h->root.root.string,
3797 h->root.u.def.section->owner);
3799 bfd_put_32 (output_bfd,
3800 (h->root.u.def.value
3801 + h->root.u.def.section->output_section->vma
3802 + h->root.u.def.section->output_offset),
3803 htab->elf.sgot->contents + h->got.offset);
3804 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3809 else if (bfd_link_pic (info))
3811 /* Generate R_386_GLOB_DAT. */
3819 if (!h->pointer_equality_needed)
3822 /* For non-shared object, we can't use .got.plt, which
3823 contains the real function addres if we need pointer
3824 equality. We load the GOT entry with the PLT entry. */
3825 if (htab->plt_second != NULL)
3827 plt = htab->plt_second;
3828 plt_offset = eh->plt_second.offset;
3832 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3833 plt_offset = h->plt.offset;
3835 bfd_put_32 (output_bfd,
3836 (plt->output_section->vma
3837 + plt->output_offset + plt_offset),
3838 htab->elf.sgot->contents + h->got.offset);
3842 else if (bfd_link_pic (info)
3843 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3845 BFD_ASSERT((h->got.offset & 1) != 0);
3846 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3850 BFD_ASSERT((h->got.offset & 1) == 0);
3852 bfd_put_32 (output_bfd, (bfd_vma) 0,
3853 htab->elf.sgot->contents + h->got.offset);
3854 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3857 elf_append_rel (output_bfd, relgot, &rel);
3862 Elf_Internal_Rela rel;
3865 /* This symbol needs a copy reloc. Set it up. */
3866 VERIFY_COPY_RELOC (h, htab)
3868 rel.r_offset = (h->root.u.def.value
3869 + h->root.u.def.section->output_section->vma
3870 + h->root.u.def.section->output_offset);
3871 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3872 if (h->root.u.def.section == htab->elf.sdynrelro)
3873 s = htab->elf.sreldynrelro;
3875 s = htab->elf.srelbss;
3876 elf_append_rel (output_bfd, s, &rel);
3882 /* Finish up local dynamic symbol handling. We set the contents of
3883 various dynamic sections here. */
3886 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3888 struct elf_link_hash_entry *h
3889 = (struct elf_link_hash_entry *) *slot;
3890 struct bfd_link_info *info
3891 = (struct bfd_link_info *) inf;
3893 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3897 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3898 here since undefined weak symbol may not be dynamic and may not be
3899 called for elf_i386_finish_dynamic_symbol. */
3902 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3905 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3906 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3908 if (h->root.type != bfd_link_hash_undefweak
3909 || h->dynindx != -1)
3912 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3916 /* Used to decide how to sort relocs in an optimal manner for the
3917 dynamic linker, before writing them out. */
3919 static enum elf_reloc_type_class
3920 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3921 const asection *rel_sec ATTRIBUTE_UNUSED,
3922 const Elf_Internal_Rela *rela)
3924 bfd *abfd = info->output_bfd;
3925 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3926 struct elf_link_hash_table *htab = elf_hash_table (info);
3928 if (htab->dynsym != NULL
3929 && htab->dynsym->contents != NULL)
3931 /* Check relocation against STT_GNU_IFUNC symbol if there are
3933 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3934 if (r_symndx != STN_UNDEF)
3936 Elf_Internal_Sym sym;
3937 if (!bed->s->swap_symbol_in (abfd,
3938 (htab->dynsym->contents
3939 + r_symndx * sizeof (Elf32_External_Sym)),
3943 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3944 return reloc_class_ifunc;
3948 switch (ELF32_R_TYPE (rela->r_info))
3950 case R_386_IRELATIVE:
3951 return reloc_class_ifunc;
3952 case R_386_RELATIVE:
3953 return reloc_class_relative;
3954 case R_386_JUMP_SLOT:
3955 return reloc_class_plt;
3957 return reloc_class_copy;
3959 return reloc_class_normal;
3963 /* Finish up the dynamic sections. */
3966 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3967 struct bfd_link_info *info)
3969 struct elf_x86_link_hash_table *htab;
3971 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3975 if (!htab->elf.dynamic_sections_created)
3978 if (htab->elf.splt && htab->elf.splt->size > 0)
3980 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3981 really seem like the right value. */
3982 elf_section_data (htab->elf.splt->output_section)
3983 ->this_hdr.sh_entsize = 4;
3985 if (htab->plt.has_plt0)
3987 /* Fill in the special first entry in the procedure linkage
3989 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
3990 htab->lazy_plt->plt0_entry_size);
3991 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
3992 htab->plt0_pad_byte,
3993 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
3994 if (!bfd_link_pic (info))
3996 bfd_put_32 (output_bfd,
3997 (htab->elf.sgotplt->output_section->vma
3998 + htab->elf.sgotplt->output_offset
4000 htab->elf.splt->contents
4001 + htab->lazy_plt->plt0_got1_offset);
4002 bfd_put_32 (output_bfd,
4003 (htab->elf.sgotplt->output_section->vma
4004 + htab->elf.sgotplt->output_offset
4006 htab->elf.splt->contents
4007 + htab->lazy_plt->plt0_got2_offset);
4009 if (htab->target_os == is_vxworks)
4011 Elf_Internal_Rela rel;
4012 int num_plts = (htab->elf.splt->size
4013 / htab->plt.plt_entry_size) - 1;
4015 asection *srelplt2 = htab->srelplt2;
4017 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4018 + 4. On IA32 we use REL relocations so the
4019 addend goes in the PLT directly. */
4020 rel.r_offset = (htab->elf.splt->output_section->vma
4021 + htab->elf.splt->output_offset
4022 + htab->lazy_plt->plt0_got1_offset);
4023 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4025 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4026 srelplt2->contents);
4027 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4029 rel.r_offset = (htab->elf.splt->output_section->vma
4030 + htab->elf.splt->output_offset
4031 + htab->lazy_plt->plt0_got2_offset);
4032 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4034 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4035 srelplt2->contents +
4036 sizeof (Elf32_External_Rel));
4037 /* Correct the .rel.plt.unloaded relocations. */
4038 p = srelplt2->contents;
4039 if (bfd_link_pic (info))
4040 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4042 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4044 for (; num_plts; num_plts--)
4046 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4047 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4049 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4050 p += sizeof (Elf32_External_Rel);
4052 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4053 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4055 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4056 p += sizeof (Elf32_External_Rel);
4063 /* Fill PLT entries for undefined weak symbols in PIE. */
4064 if (bfd_link_pie (info))
4065 bfd_hash_traverse (&info->hash->table,
4066 elf_i386_pie_finish_undefweak_symbol,
4072 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4073 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4074 It has to be done before elf_link_sort_relocs is called so that
4075 dynamic relocations are properly sorted. */
4078 elf_i386_output_arch_local_syms
4079 (bfd *output_bfd ATTRIBUTE_UNUSED,
4080 struct bfd_link_info *info,
4081 void *flaginfo ATTRIBUTE_UNUSED,
4082 int (*func) (void *, const char *,
4085 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4087 struct elf_x86_link_hash_table *htab
4088 = elf_x86_hash_table (info, I386_ELF_DATA);
4092 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4093 htab_traverse (htab->loc_hash_table,
4094 elf_i386_finish_local_dynamic_symbol,
4100 /* Forward declaration. */
4101 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4103 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4104 dynamic relocations. */
4107 elf_i386_get_synthetic_symtab (bfd *abfd,
4108 long symcount ATTRIBUTE_UNUSED,
4109 asymbol **syms ATTRIBUTE_UNUSED,
4116 bfd_byte *plt_contents;
4118 const struct elf_x86_lazy_plt_layout *lazy_plt;
4119 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4120 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4121 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4124 enum elf_x86_plt_type plt_type;
4125 struct elf_x86_plt plts[] =
4127 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4128 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4129 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4130 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4135 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4138 if (dynsymcount <= 0)
4141 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4145 non_lazy_plt = NULL;
4146 /* Silence GCC 6. */
4148 non_lazy_ibt_plt = NULL;
4149 lazy_ibt_plt = NULL;
4150 switch (get_elf_x86_backend_data (abfd)->target_os)
4154 non_lazy_plt = &elf_i386_non_lazy_plt;
4155 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4156 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4159 lazy_plt = &elf_i386_lazy_plt;
4162 lazy_plt = &elf_i386_nacl_plt;
4169 for (j = 0; plts[j].name != NULL; j++)
4171 plt = bfd_get_section_by_name (abfd, plts[j].name);
4172 if (plt == NULL || plt->size == 0)
4175 /* Get the PLT section contents. */
4176 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4177 if (plt_contents == NULL)
4179 if (!bfd_get_section_contents (abfd, (asection *) plt,
4180 plt_contents, 0, plt->size))
4182 free (plt_contents);
4186 /* Check what kind of PLT it is. */
4187 plt_type = plt_unknown;
4188 if (plts[j].type == plt_unknown
4189 && (plt->size >= (lazy_plt->plt0_entry_size
4190 + lazy_plt->plt_entry_size)))
4192 /* Match lazy PLT first. */
4193 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4194 lazy_plt->plt0_got1_offset) == 0)
4196 /* The fist entry in the lazy IBT PLT is the same as the
4198 if (lazy_ibt_plt != NULL
4199 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4200 lazy_ibt_plt->plt_entry,
4201 lazy_ibt_plt->plt_got_offset) == 0))
4202 plt_type = plt_lazy | plt_second;
4204 plt_type = plt_lazy;
4206 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4207 lazy_plt->plt0_got1_offset) == 0)
4209 /* The fist entry in the PIC lazy IBT PLT is the same as
4210 the normal PIC lazy PLT. */
4211 if (lazy_ibt_plt != NULL
4212 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4213 lazy_ibt_plt->pic_plt_entry,
4214 lazy_ibt_plt->plt_got_offset) == 0))
4215 plt_type = plt_lazy | plt_pic | plt_second;
4217 plt_type = plt_lazy | plt_pic;
4221 if (non_lazy_plt != NULL
4222 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4223 && plt->size >= non_lazy_plt->plt_entry_size)
4225 /* Match non-lazy PLT. */
4226 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4227 non_lazy_plt->plt_got_offset) == 0)
4228 plt_type = plt_non_lazy;
4229 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4230 non_lazy_plt->plt_got_offset) == 0)
4234 if ((non_lazy_ibt_plt != NULL)
4235 && (plt_type == plt_unknown || plt_type == plt_second)
4236 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4238 if (memcmp (plt_contents,
4239 non_lazy_ibt_plt->plt_entry,
4240 non_lazy_ibt_plt->plt_got_offset) == 0)
4242 /* Match IBT PLT. */
4243 plt_type = plt_second;
4244 non_lazy_plt = non_lazy_ibt_plt;
4246 else if (memcmp (plt_contents,
4247 non_lazy_ibt_plt->pic_plt_entry,
4248 non_lazy_ibt_plt->plt_got_offset) == 0)
4250 /* Match PIC IBT PLT. */
4251 plt_type = plt_second | plt_pic;
4252 non_lazy_plt = non_lazy_ibt_plt;
4256 if (plt_type == plt_unknown)
4258 free (plt_contents);
4263 plts[j].type = plt_type;
4265 if ((plt_type & plt_lazy))
4267 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4268 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4269 /* Skip PLT0 in lazy PLT. */
4274 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4275 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4279 /* Skip lazy PLT when the second PLT is used. */
4280 if ((plt_type & (plt_lazy | plt_second))
4281 == (plt_lazy | plt_second))
4285 n = plt->size / plts[j].plt_entry_size;
4290 plts[j].contents = plt_contents;
4292 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4293 if ((plt_type & plt_pic))
4294 got_addr = (bfd_vma) -1;
4297 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4298 got_addr, plts, dynsyms,
4302 /* Set up i386 GNU properties. Return the first relocatable ELF input
4303 with GNU properties if found. Otherwise, return NULL. */
4306 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4308 struct elf_x86_init_table init_table;
4310 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4314 init_table.plt0_pad_byte = 0x0;
4315 init_table.lazy_plt = &elf_i386_lazy_plt;
4316 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4317 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4318 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4321 init_table.plt0_pad_byte = 0x90;
4322 init_table.lazy_plt = &elf_i386_lazy_plt;
4323 init_table.non_lazy_plt = NULL;
4324 init_table.lazy_ibt_plt = NULL;
4325 init_table.non_lazy_ibt_plt = NULL;
4328 init_table.plt0_pad_byte = 0x90;
4329 init_table.lazy_plt = &elf_i386_nacl_plt;
4330 init_table.non_lazy_plt = NULL;
4331 init_table.lazy_ibt_plt = NULL;
4332 init_table.non_lazy_ibt_plt = NULL;
4336 init_table.r_info = elf32_r_info;
4337 init_table.r_sym = elf32_r_sym;
4339 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4342 #define TARGET_LITTLE_SYM i386_elf32_vec
4343 #define TARGET_LITTLE_NAME "elf32-i386"
4344 #define ELF_ARCH bfd_arch_i386
4345 #define ELF_TARGET_ID I386_ELF_DATA
4346 #define ELF_MACHINE_CODE EM_386
4347 #define ELF_MAXPAGESIZE 0x1000
4349 #define elf_backend_can_gc_sections 1
4350 #define elf_backend_can_refcount 1
4351 #define elf_backend_want_got_plt 1
4352 #define elf_backend_plt_readonly 1
4353 #define elf_backend_want_plt_sym 0
4354 #define elf_backend_got_header_size 12
4355 #define elf_backend_plt_alignment 4
4356 #define elf_backend_dtrel_excludes_plt 1
4357 #define elf_backend_extern_protected_data 1
4358 #define elf_backend_caches_rawsize 1
4359 #define elf_backend_want_dynrelro 1
4361 /* Support RELA for objdump of prelink objects. */
4362 #define elf_info_to_howto elf_i386_info_to_howto_rel
4363 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4365 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4366 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4367 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4368 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4370 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4371 #define elf_backend_check_relocs elf_i386_check_relocs
4372 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4373 #define elf_backend_fake_sections elf_i386_fake_sections
4374 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4375 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4376 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4377 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4378 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4379 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4380 #define elf_backend_relocate_section elf_i386_relocate_section
4381 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4382 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4384 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4386 #define elf32_bed elf32_i386_bed
4388 #include "elf32-target.h"
4390 /* FreeBSD support. */
4392 #undef TARGET_LITTLE_SYM
4393 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4394 #undef TARGET_LITTLE_NAME
4395 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4397 #define ELF_OSABI ELFOSABI_FREEBSD
4399 /* The kernel recognizes executables as valid only if they carry a
4400 "FreeBSD" label in the ELF header. So we put this label on all
4401 executables and (for simplicity) also all other object files. */
4404 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4406 _bfd_elf_post_process_headers (abfd, info);
4408 #ifdef OLD_FREEBSD_ABI_LABEL
4410 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4411 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4412 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4417 #undef elf_backend_post_process_headers
4418 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4420 #define elf32_bed elf32_i386_fbsd_bed
4422 #undef elf_backend_add_symbol_hook
4424 #include "elf32-target.h"
4428 #undef TARGET_LITTLE_SYM
4429 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4430 #undef TARGET_LITTLE_NAME
4431 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4433 static const struct elf_x86_backend_data elf_i386_solaris_arch_bed =
4438 #undef elf_backend_arch_data
4439 #define elf_backend_arch_data &elf_i386_solaris_arch_bed
4441 #undef elf_backend_post_process_headers
4443 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4444 objects won't be recognized. */
4448 #define elf32_bed elf32_i386_sol2_bed
4450 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4452 #undef elf_backend_static_tls_alignment
4453 #define elf_backend_static_tls_alignment 8
4455 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4457 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4459 #undef elf_backend_want_plt_sym
4460 #define elf_backend_want_plt_sym 1
4462 #undef elf_backend_strtab_flags
4463 #define elf_backend_strtab_flags SHF_STRINGS
4465 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4466 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4467 FALSE otherwise. ISECTION is the best guess matching section from the
4468 input bfd IBFD, but it might be NULL. */
4471 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4472 bfd *obfd ATTRIBUTE_UNUSED,
4473 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4474 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4476 /* PR 19938: FIXME: Need to add code for setting the sh_info
4477 and sh_link fields of Solaris specific section types. */
4480 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4481 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4483 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4485 The following values should be set:
4488 -----------------------------------------------------------------------------
4489 SHT_SUNW_ancillary The section header index of 0
4490 [0x6fffffee] the associated string table.
4492 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4493 [0x6ffffff0] the associated symbol table. section header index of
4495 SHT_SUNW_capchain table,
4498 SHT_SUNW_symsort The section header index of 0
4499 [0x6ffffff1] the associated symbol table.
4501 SHT_SUNW_tlssort The section header index of 0
4502 [0x6ffffff2] the associated symbol table.
4504 SHT_SUNW_LDYNSYM The section header index of One greater than the
4505 [0x6ffffff3] the associated string table. symbol table index of the
4506 This index is the same string last local symbol,
4507 table used by the SHT_DYNSYM STB_LOCAL. Since
4508 section. SHT_SUNW_LDYNSYM only
4509 contains local symbols,
4510 sh_info is equivalent to
4511 the number of symbols in
4514 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4515 [0x6ffffff5] the section header index of to named strings, the
4516 the associated section header index of
4517 SHT_SUNW_capinfo table, the associated string
4518 otherwise 0. table, otherwise 0.
4520 SHT_SUNW_move The section header index of 0
4521 [0x6ffffffa] the associated symbol table.
4526 SHT_SUNW_syminfo The section header index of The section header index
4527 [0x6ffffffc] the associated symbol table. of the associated
4530 SHT_SUNW_verdef The section header index of The number of version
4531 [0x6ffffffd] the associated string table. definitions within the
4534 SHT_SUNW_verneed The section header index of The number of version
4535 [0x6ffffffe] the associated string table. dependencies within the
4538 SHT_SUNW_versym The section header index of 0
4539 [0x6fffffff] the associated symbol table. */
4542 #undef elf_backend_copy_special_section_fields
4543 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4545 #include "elf32-target.h"
4547 /* Intel MCU support. */
4550 elf32_iamcu_elf_object_p (bfd *abfd)
4552 /* Set the right machine number for an IAMCU elf32 file. */
4553 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4557 #undef TARGET_LITTLE_SYM
4558 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4559 #undef TARGET_LITTLE_NAME
4560 #define TARGET_LITTLE_NAME "elf32-iamcu"
4562 #define ELF_ARCH bfd_arch_iamcu
4564 #undef ELF_MACHINE_CODE
4565 #define ELF_MACHINE_CODE EM_IAMCU
4567 #undef elf_backend_arch_data
4568 #define elf_backend_arch_data &elf_i386_arch_bed
4573 #define elf32_bed elf32_iamcu_bed
4575 #undef elf_backend_object_p
4576 #define elf_backend_object_p elf32_iamcu_elf_object_p
4578 #undef elf_backend_static_tls_alignment
4580 #undef elf_backend_want_plt_sym
4581 #define elf_backend_want_plt_sym 0
4583 #undef elf_backend_strtab_flags
4584 #undef elf_backend_copy_special_section_fields
4586 #include "elf32-target.h"
4588 /* Restore defaults. */
4590 #define ELF_ARCH bfd_arch_i386
4591 #undef ELF_MACHINE_CODE
4592 #define ELF_MACHINE_CODE EM_386
4594 /* Native Client support. */
4596 #undef TARGET_LITTLE_SYM
4597 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4598 #undef TARGET_LITTLE_NAME
4599 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4601 #define elf32_bed elf32_i386_nacl_bed
4603 #undef ELF_MAXPAGESIZE
4604 #define ELF_MAXPAGESIZE 0x10000
4606 /* Restore defaults. */
4608 #undef elf_backend_want_plt_sym
4609 #define elf_backend_want_plt_sym 0
4610 #undef elf_backend_post_process_headers
4611 #undef elf_backend_static_tls_alignment
4613 /* NaCl uses substantially different PLT entries for the same effects. */
4615 #undef elf_backend_plt_alignment
4616 #define elf_backend_plt_alignment 5
4617 #define NACL_PLT_ENTRY_SIZE 64
4618 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4620 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4622 0xff, 0x35, /* pushl contents of address */
4623 0, 0, 0, 0, /* replaced with address of .got + 4. */
4624 0x8b, 0x0d, /* movl contents of address, %ecx */
4625 0, 0, 0, 0, /* replaced with address of .got + 8. */
4626 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4627 0xff, 0xe1 /* jmp *%ecx */
4630 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4632 0x8b, 0x0d, /* movl contents of address, %ecx */
4633 0, 0, 0, 0, /* replaced with GOT slot address. */
4634 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4635 0xff, 0xe1, /* jmp *%ecx */
4637 /* Pad to the next 32-byte boundary with nop instructions. */
4639 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4640 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4642 /* Lazy GOT entries point here (32-byte aligned). */
4643 0x68, /* pushl immediate */
4644 0, 0, 0, 0, /* replaced with reloc offset. */
4645 0xe9, /* jmp relative */
4646 0, 0, 0, 0, /* replaced with offset to .plt. */
4648 /* Pad to the next 32-byte boundary with nop instructions. */
4649 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4650 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4654 static const bfd_byte
4655 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4657 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4658 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4659 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4660 0xff, 0xe1, /* jmp *%ecx */
4662 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4663 so pad to that size with nop instructions. */
4664 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4667 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4669 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4670 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4671 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4672 0xff, 0xe1, /* jmp *%ecx */
4674 /* Pad to the next 32-byte boundary with nop instructions. */
4676 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4677 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4679 /* Lazy GOT entries point here (32-byte aligned). */
4680 0x68, /* pushl immediate */
4681 0, 0, 0, 0, /* replaced with offset into relocation table. */
4682 0xe9, /* jmp relative */
4683 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4685 /* Pad to the next 32-byte boundary with nop instructions. */
4686 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4687 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4691 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4693 #if (PLT_CIE_LENGTH != 20 \
4694 || PLT_FDE_LENGTH != 36 \
4695 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4696 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4697 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4699 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4700 0, 0, 0, 0, /* CIE ID */
4701 1, /* CIE version */
4702 'z', 'R', 0, /* Augmentation string */
4703 1, /* Code alignment factor */
4704 0x7c, /* Data alignment factor: -4 */
4705 8, /* Return address column */
4706 1, /* Augmentation size */
4707 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4708 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4709 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4710 DW_CFA_nop, DW_CFA_nop,
4712 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4713 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4714 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4715 0, 0, 0, 0, /* .plt size goes here */
4716 0, /* Augmentation size */
4717 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4718 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4719 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4720 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4721 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4722 13, /* Block length */
4723 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4724 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4725 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4726 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4727 DW_CFA_nop, DW_CFA_nop
4730 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4732 elf_i386_nacl_plt0_entry, /* plt0_entry */
4733 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4734 elf_i386_nacl_plt_entry, /* plt_entry */
4735 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4736 NULL, /* plt_tlsdesc_entry */
4737 0, /* plt_tlsdesc_entry_size*/
4738 0, /* plt_tlsdesc_got1_offset */
4739 0, /* plt_tlsdesc_got2_offset */
4740 0, /* plt_tlsdesc_got1_insn_end */
4741 0, /* plt_tlsdesc_got2_insn_end */
4742 2, /* plt0_got1_offset */
4743 8, /* plt0_got2_offset */
4744 0, /* plt0_got2_insn_end */
4745 2, /* plt_got_offset */
4746 33, /* plt_reloc_offset */
4747 38, /* plt_plt_offset */
4748 0, /* plt_got_insn_size */
4749 0, /* plt_plt_insn_end */
4750 32, /* plt_lazy_offset */
4751 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4752 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4753 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4754 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4757 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4763 elf32_i386_nacl_elf_object_p (bfd *abfd)
4765 /* Set the right machine number for a NaCl i386 ELF32 file. */
4766 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4770 #undef elf_backend_arch_data
4771 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4773 #undef elf_backend_object_p
4774 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4775 #undef elf_backend_modify_segment_map
4776 #define elf_backend_modify_segment_map nacl_modify_segment_map
4777 #undef elf_backend_modify_program_headers
4778 #define elf_backend_modify_program_headers nacl_modify_program_headers
4779 #undef elf_backend_final_write_processing
4780 #define elf_backend_final_write_processing nacl_final_write_processing
4782 #include "elf32-target.h"
4784 /* Restore defaults. */
4785 #undef elf_backend_object_p
4786 #undef elf_backend_modify_segment_map
4787 #undef elf_backend_modify_program_headers
4788 #undef elf_backend_final_write_processing
4790 /* VxWorks support. */
4792 #undef TARGET_LITTLE_SYM
4793 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4794 #undef TARGET_LITTLE_NAME
4795 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4797 #undef ELF_MAXPAGESIZE
4798 #define ELF_MAXPAGESIZE 0x1000
4799 #undef elf_backend_plt_alignment
4800 #define elf_backend_plt_alignment 4
4802 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4807 #undef elf_backend_arch_data
4808 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4810 #undef elf_backend_relocs_compatible
4811 #undef elf_backend_add_symbol_hook
4812 #define elf_backend_add_symbol_hook \
4813 elf_vxworks_add_symbol_hook
4814 #undef elf_backend_link_output_symbol_hook
4815 #define elf_backend_link_output_symbol_hook \
4816 elf_vxworks_link_output_symbol_hook
4817 #undef elf_backend_emit_relocs
4818 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4819 #undef elf_backend_final_write_processing
4820 #define elf_backend_final_write_processing \
4821 elf_vxworks_final_write_processing
4822 #undef elf_backend_static_tls_alignment
4824 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4826 #undef elf_backend_want_plt_sym
4827 #define elf_backend_want_plt_sym 1
4830 #define elf32_bed elf32_i386_vxworks_bed
4832 #include "elf32-target.h"