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. */
1579 if (h->type == STT_GNU_IFUNC)
1580 elf_tdata (info->output_bfd)->has_gnu_symbols
1581 |= elf_gnu_symbol_ifunc;
1584 if (r_type == R_386_GOT32X
1585 && (h == NULL || h->type != STT_GNU_IFUNC))
1587 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1588 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1594 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1595 symtab_hdr, sym_hashes,
1596 &r_type, GOT_UNKNOWN,
1597 rel, rel_end, h, r_symndx, FALSE))
1600 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1601 if (h == htab->elf.hgot)
1602 htab->got_referenced = TRUE;
1607 htab->tls_ld_or_ldm_got.refcount = 1;
1611 /* This symbol requires a procedure linkage table entry. We
1612 actually build the entry in adjust_dynamic_symbol,
1613 because this might be a case of linking PIC code which is
1614 never referenced by a dynamic object, in which case we
1615 don't need to generate a procedure linkage table entry
1618 /* If this is a local symbol, we resolve it directly without
1619 creating a procedure linkage table entry. */
1623 eh->zero_undefweak &= 0x2;
1625 h->plt.refcount = 1;
1632 case R_386_TLS_IE_32:
1634 case R_386_TLS_GOTIE:
1635 if (!bfd_link_executable (info))
1636 info->flags |= DF_STATIC_TLS;
1642 case R_386_TLS_GOTDESC:
1643 case R_386_TLS_DESC_CALL:
1644 /* This symbol requires a global offset table entry. */
1646 int tls_type, old_tls_type;
1653 tls_type = GOT_NORMAL;
1655 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1656 case R_386_TLS_GOTDESC:
1657 case R_386_TLS_DESC_CALL:
1658 tls_type = GOT_TLS_GDESC; break;
1659 case R_386_TLS_IE_32:
1660 if (ELF32_R_TYPE (rel->r_info) == r_type)
1661 tls_type = GOT_TLS_IE_NEG;
1663 /* If this is a GD->IE transition, we may use either of
1664 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1665 tls_type = GOT_TLS_IE;
1668 case R_386_TLS_GOTIE:
1669 tls_type = GOT_TLS_IE_POS; break;
1674 h->got.refcount = 1;
1675 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1679 bfd_signed_vma *local_got_refcounts;
1681 /* This is a global offset table entry for a local symbol. */
1682 local_got_refcounts = elf_local_got_refcounts (abfd);
1683 if (local_got_refcounts == NULL)
1687 size = symtab_hdr->sh_info;
1688 size *= (sizeof (bfd_signed_vma)
1689 + sizeof (bfd_vma) + sizeof(char));
1690 local_got_refcounts = (bfd_signed_vma *)
1691 bfd_zalloc (abfd, size);
1692 if (local_got_refcounts == NULL)
1694 elf_local_got_refcounts (abfd) = local_got_refcounts;
1695 elf_x86_local_tlsdesc_gotent (abfd)
1696 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1697 elf_x86_local_got_tls_type (abfd)
1698 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1700 local_got_refcounts[r_symndx] = 1;
1701 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1704 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1705 tls_type |= old_tls_type;
1706 /* If a TLS symbol is accessed using IE at least once,
1707 there is no point to use dynamic model for it. */
1708 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1709 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1710 || (tls_type & GOT_TLS_IE) == 0))
1712 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1713 tls_type = old_tls_type;
1714 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1715 && GOT_TLS_GD_ANY_P (tls_type))
1716 tls_type |= old_tls_type;
1720 name = h->root.root.string;
1722 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1725 /* xgettext:c-format */
1726 (_("%pB: `%s' accessed both as normal and "
1727 "thread local symbol"),
1729 bfd_set_error (bfd_error_bad_value);
1734 if (old_tls_type != tls_type)
1737 elf_x86_hash_entry (h)->tls_type = tls_type;
1739 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1747 if (r_type != R_386_TLS_IE)
1751 eh->zero_undefweak &= 0x2;
1753 /* Need GOT to resolve undefined weak symbol to 0. */
1754 if (r_type == R_386_GOTOFF
1755 && h->root.type == bfd_link_hash_undefweak
1756 && bfd_link_executable (info))
1757 htab->got_referenced = TRUE;
1763 case R_386_TLS_LE_32:
1766 eh->zero_undefweak &= 0x2;
1767 if (bfd_link_executable (info))
1769 info->flags |= DF_STATIC_TLS;
1774 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1775 eh->zero_undefweak |= 0x2;
1777 /* We are called after all symbols have been resolved. Only
1778 relocation against STT_GNU_IFUNC symbol must go through
1781 && (bfd_link_executable (info)
1782 || h->type == STT_GNU_IFUNC))
1784 bfd_boolean func_pointer_ref = FALSE;
1786 if (r_type == R_386_PC32)
1788 /* Since something like ".long foo - ." may be used
1789 as pointer, make sure that PLT is used if foo is
1790 a function defined in a shared library. */
1791 if ((sec->flags & SEC_CODE) == 0)
1792 h->pointer_equality_needed = 1;
1793 else if (h->type == STT_GNU_IFUNC
1794 && bfd_link_pic (info))
1797 /* xgettext:c-format */
1798 (_("%pB: unsupported non-PIC call to IFUNC `%s'"),
1799 abfd, h->root.root.string);
1800 bfd_set_error (bfd_error_bad_value);
1806 h->pointer_equality_needed = 1;
1807 /* R_386_32 can be resolved at run-time. */
1808 if (r_type == R_386_32
1809 && (sec->flags & SEC_READONLY) == 0)
1810 func_pointer_ref = TRUE;
1813 if (!func_pointer_ref)
1815 /* If this reloc is in a read-only section, we might
1816 need a copy reloc. We can't check reliably at this
1817 stage whether the section is read-only, as input
1818 sections have not yet been mapped to output sections.
1819 Tentatively set the flag for now, and correct in
1820 adjust_dynamic_symbol. */
1823 /* We may need a .plt entry if the symbol is a function
1824 defined in a shared lib or is a function referenced
1825 from the code or read-only section. */
1827 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1828 h->plt.refcount = 1;
1834 if (NEED_DYNAMIC_RELOCATION_P (info, FALSE, h, sec, r_type,
1837 struct elf_dyn_relocs *p;
1838 struct elf_dyn_relocs **head;
1840 /* We must copy these reloc types into the output file.
1841 Create a reloc section in dynobj and make room for
1845 sreloc = _bfd_elf_make_dynamic_reloc_section
1846 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1852 /* If this is a global symbol, we count the number of
1853 relocations we need for this symbol. */
1856 head = &eh->dyn_relocs;
1860 /* Track dynamic relocs needed for local syms too.
1861 We really need local syms available to do this
1866 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1871 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1875 vpp = &elf_section_data (s)->local_dynrel;
1876 head = (struct elf_dyn_relocs **)vpp;
1880 if (p == NULL || p->sec != sec)
1882 bfd_size_type amt = sizeof *p;
1883 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1895 /* Count size relocation as PC-relative relocation. */
1896 if (r_type == R_386_PC32 || size_reloc)
1901 /* This relocation describes the C++ object vtable hierarchy.
1902 Reconstruct it for later use during GC. */
1903 case R_386_GNU_VTINHERIT:
1904 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1908 /* This relocation describes which C++ vtable entries are actually
1909 used. Record for later use during GC. */
1910 case R_386_GNU_VTENTRY:
1911 if (!bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1920 if (elf_section_data (sec)->this_hdr.contents != contents)
1922 if (!converted && !info->keep_memory)
1926 /* Cache the section contents for elf_link_input_bfd if any
1927 load is converted or --no-keep-memory isn't used. */
1928 elf_section_data (sec)->this_hdr.contents = contents;
1932 /* Cache relocations if any load is converted. */
1933 if (elf_section_data (sec)->relocs != relocs && converted)
1934 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1939 if (elf_section_data (sec)->this_hdr.contents != contents)
1941 sec->check_relocs_failed = 1;
1945 /* Set the correct type for an x86 ELF section. We do this by the
1946 section name, which is a hack, but ought to work. */
1949 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1950 Elf_Internal_Shdr *hdr,
1955 name = bfd_get_section_name (abfd, sec);
1957 /* This is an ugly, but unfortunately necessary hack that is
1958 needed when producing EFI binaries on x86. It tells
1959 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1960 containing ELF relocation info. We need this hack in order to
1961 be able to generate ELF binaries that can be translated into
1962 EFI applications (which are essentially COFF objects). Those
1963 files contain a COFF ".reloc" section inside an ELFNN object,
1964 which would normally cause BFD to segfault because it would
1965 attempt to interpret this section as containing relocation
1966 entries for section "oc". With this hack enabled, ".reloc"
1967 will be treated as a normal data section, which will avoid the
1968 segfault. However, you won't be able to create an ELFNN binary
1969 with a section named "oc" that needs relocations, but that's
1970 the kind of ugly side-effects you get when detecting section
1971 types based on their names... In practice, this limitation is
1972 unlikely to bite. */
1973 if (strcmp (name, ".reloc") == 0)
1974 hdr->sh_type = SHT_PROGBITS;
1979 /* Return the relocation value for @tpoff relocation
1980 if STT_TLS virtual address is ADDRESS. */
1983 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1985 struct elf_link_hash_table *htab = elf_hash_table (info);
1986 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1987 bfd_vma static_tls_size;
1989 /* If tls_sec is NULL, we should have signalled an error already. */
1990 if (htab->tls_sec == NULL)
1993 /* Consider special static TLS alignment requirements. */
1994 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1995 return static_tls_size + htab->tls_sec->vma - address;
1998 /* Relocate an i386 ELF section. */
2001 elf_i386_relocate_section (bfd *output_bfd,
2002 struct bfd_link_info *info,
2004 asection *input_section,
2006 Elf_Internal_Rela *relocs,
2007 Elf_Internal_Sym *local_syms,
2008 asection **local_sections)
2010 struct elf_x86_link_hash_table *htab;
2011 Elf_Internal_Shdr *symtab_hdr;
2012 struct elf_link_hash_entry **sym_hashes;
2013 bfd_vma *local_got_offsets;
2014 bfd_vma *local_tlsdesc_gotents;
2015 Elf_Internal_Rela *rel;
2016 Elf_Internal_Rela *wrel;
2017 Elf_Internal_Rela *relend;
2018 bfd_boolean is_vxworks_tls;
2019 unsigned plt_entry_size;
2021 /* Skip if check_relocs failed. */
2022 if (input_section->check_relocs_failed)
2025 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2029 if (!is_x86_elf (input_bfd, htab))
2031 bfd_set_error (bfd_error_wrong_format);
2035 symtab_hdr = &elf_symtab_hdr (input_bfd);
2036 sym_hashes = elf_sym_hashes (input_bfd);
2037 local_got_offsets = elf_local_got_offsets (input_bfd);
2038 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2039 /* We have to handle relocations in vxworks .tls_vars sections
2040 specially, because the dynamic loader is 'weird'. */
2041 is_vxworks_tls = (htab->target_os == is_vxworks
2042 && bfd_link_pic (info)
2043 && !strcmp (input_section->output_section->name,
2046 _bfd_x86_elf_set_tls_module_base (info);
2048 plt_entry_size = htab->plt.plt_entry_size;
2050 rel = wrel = relocs;
2051 relend = relocs + input_section->reloc_count;
2052 for (; rel < relend; wrel++, rel++)
2054 unsigned int r_type, r_type_tls;
2055 reloc_howto_type *howto;
2056 unsigned long r_symndx;
2057 struct elf_link_hash_entry *h;
2058 struct elf_x86_link_hash_entry *eh;
2059 Elf_Internal_Sym *sym;
2061 bfd_vma off, offplt, plt_offset;
2063 bfd_boolean unresolved_reloc;
2064 bfd_reloc_status_type r;
2068 asection *resolved_plt;
2069 bfd_boolean resolved_to_zero;
2070 bfd_boolean relative_reloc;
2072 r_type = ELF32_R_TYPE (rel->r_info);
2073 if (r_type == R_386_GNU_VTINHERIT
2074 || r_type == R_386_GNU_VTENTRY)
2081 howto = elf_i386_rtype_to_howto (r_type);
2083 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2085 r_symndx = ELF32_R_SYM (rel->r_info);
2089 unresolved_reloc = FALSE;
2090 if (r_symndx < symtab_hdr->sh_info)
2092 sym = local_syms + r_symndx;
2093 sec = local_sections[r_symndx];
2094 relocation = (sec->output_section->vma
2095 + sec->output_offset
2097 st_size = sym->st_size;
2099 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2100 && ((sec->flags & SEC_MERGE) != 0
2101 || (bfd_link_relocatable (info)
2102 && sec->output_offset != 0)))
2105 bfd_byte *where = contents + rel->r_offset;
2107 switch (howto->size)
2110 addend = bfd_get_8 (input_bfd, where);
2111 if (howto->pc_relative)
2113 addend = (addend ^ 0x80) - 0x80;
2118 addend = bfd_get_16 (input_bfd, where);
2119 if (howto->pc_relative)
2121 addend = (addend ^ 0x8000) - 0x8000;
2126 addend = bfd_get_32 (input_bfd, where);
2127 if (howto->pc_relative)
2129 addend = (addend ^ 0x80000000) - 0x80000000;
2137 if (bfd_link_relocatable (info))
2138 addend += sec->output_offset;
2141 asection *msec = sec;
2142 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2144 addend -= relocation;
2145 addend += msec->output_section->vma + msec->output_offset;
2148 switch (howto->size)
2151 /* FIXME: overflow checks. */
2152 if (howto->pc_relative)
2154 bfd_put_8 (input_bfd, addend, where);
2157 if (howto->pc_relative)
2159 bfd_put_16 (input_bfd, addend, where);
2162 if (howto->pc_relative)
2164 bfd_put_32 (input_bfd, addend, where);
2168 else if (!bfd_link_relocatable (info)
2169 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2171 /* Relocate against local STT_GNU_IFUNC symbol. */
2172 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2177 /* Set STT_GNU_IFUNC symbol value. */
2178 h->root.u.def.value = sym->st_value;
2179 h->root.u.def.section = sec;
2184 bfd_boolean warned ATTRIBUTE_UNUSED;
2185 bfd_boolean ignored ATTRIBUTE_UNUSED;
2187 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2188 r_symndx, symtab_hdr, sym_hashes,
2190 unresolved_reloc, warned, ignored);
2194 if (sec != NULL && discarded_section (sec))
2196 _bfd_clear_contents (howto, input_bfd, input_section,
2197 contents, rel->r_offset);
2198 wrel->r_offset = rel->r_offset;
2202 /* For ld -r, remove relocations in debug sections against
2203 sections defined in discarded sections. Not done for
2204 eh_frame editing code expects to be present. */
2205 if (bfd_link_relocatable (info)
2206 && (input_section->flags & SEC_DEBUGGING))
2212 if (bfd_link_relocatable (info))
2219 eh = (struct elf_x86_link_hash_entry *) h;
2221 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2222 it here if it is defined in a non-shared object. */
2224 && h->type == STT_GNU_IFUNC
2227 asection *gotplt, *base_got;
2231 if ((input_section->flags & SEC_ALLOC) == 0)
2233 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2234 STT_GNU_IFUNC symbol as STT_FUNC. */
2235 if (elf_section_type (input_section) == SHT_NOTE)
2237 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2238 sections because such sections are not SEC_ALLOC and
2239 thus ld.so will not process them. */
2240 if ((input_section->flags & SEC_DEBUGGING) != 0)
2245 /* STT_GNU_IFUNC symbol must go through PLT. */
2246 if (htab->elf.splt != NULL)
2248 if (htab->plt_second != NULL)
2250 resolved_plt = htab->plt_second;
2251 plt_offset = eh->plt_second.offset;
2255 resolved_plt = htab->elf.splt;
2256 plt_offset = h->plt.offset;
2258 gotplt = htab->elf.sgotplt;
2262 resolved_plt = htab->elf.iplt;
2263 plt_offset = h->plt.offset;
2264 gotplt = htab->elf.igotplt;
2274 base_got = htab->elf.sgot;
2275 off = h->got.offset;
2277 if (base_got == NULL)
2280 if (off == (bfd_vma) -1)
2282 /* We can't use h->got.offset here to save state, or
2283 even just remember the offset, as finish_dynamic_symbol
2284 would use that as offset into .got. */
2286 if (h->plt.offset == (bfd_vma) -1)
2289 if (htab->elf.splt != NULL)
2291 plt_index = (h->plt.offset / plt_entry_size
2292 - htab->plt.has_plt0);
2293 off = (plt_index + 3) * 4;
2294 base_got = htab->elf.sgotplt;
2298 plt_index = h->plt.offset / plt_entry_size;
2299 off = plt_index * 4;
2300 base_got = htab->elf.igotplt;
2303 if (h->dynindx == -1
2307 /* This references the local defitionion. We must
2308 initialize this entry in the global offset table.
2309 Since the offset must always be a multiple of 8,
2310 we use the least significant bit to record
2311 whether we have initialized it already.
2313 When doing a dynamic link, we create a .rela.got
2314 relocation entry to initialize the value. This
2315 is done in the finish_dynamic_symbol routine. */
2320 bfd_put_32 (output_bfd, relocation,
2321 base_got->contents + off);
2329 relocation = (base_got->output_section->vma
2330 + base_got->output_offset + off
2331 - gotplt->output_section->vma
2332 - gotplt->output_offset);
2334 if (rel->r_offset > 1
2335 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2336 && *(contents + rel->r_offset - 2) != 0x8d)
2338 if (bfd_link_pic (info))
2339 goto disallow_got32;
2341 /* Add the GOT base if there is no base register. */
2342 relocation += (gotplt->output_section->vma
2343 + gotplt->output_offset);
2345 else if (htab->elf.splt == NULL)
2347 /* Adjust for static executables. */
2348 relocation += gotplt->output_offset;
2354 if (h->plt.offset == (bfd_vma) -1)
2356 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2357 if (r_type == R_386_32
2358 && (input_section->flags & SEC_CODE) == 0)
2359 goto do_ifunc_pointer;
2360 goto bad_ifunc_reloc;
2363 relocation = (resolved_plt->output_section->vma
2364 + resolved_plt->output_offset + plt_offset);
2370 if (h->root.root.string)
2371 name = h->root.root.string;
2373 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2376 /* xgettext:c-format */
2377 (_("%pB: relocation %s against STT_GNU_IFUNC "
2378 "symbol `%s' isn't supported"), input_bfd,
2380 bfd_set_error (bfd_error_bad_value);
2384 /* Generate dynamic relcoation only when there is a
2385 non-GOT reference in a shared object. */
2386 if ((bfd_link_pic (info) && h->non_got_ref)
2387 || h->plt.offset == (bfd_vma) -1)
2389 Elf_Internal_Rela outrel;
2394 /* Need a dynamic relocation to get the real function
2396 offset = _bfd_elf_section_offset (output_bfd,
2400 if (offset == (bfd_vma) -1
2401 || offset == (bfd_vma) -2)
2404 outrel.r_offset = (input_section->output_section->vma
2405 + input_section->output_offset
2408 if (POINTER_LOCAL_IFUNC_P (info, h))
2410 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2411 h->root.root.string,
2412 h->root.u.def.section->owner);
2414 /* This symbol is resolved locally. */
2415 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2416 bfd_put_32 (output_bfd,
2417 (h->root.u.def.value
2418 + h->root.u.def.section->output_section->vma
2419 + h->root.u.def.section->output_offset),
2423 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2425 /* Dynamic relocations are stored in
2426 1. .rel.ifunc section in PIC object.
2427 2. .rel.got section in dynamic executable.
2428 3. .rel.iplt section in static executable. */
2429 if (bfd_link_pic (info))
2430 sreloc = htab->elf.irelifunc;
2431 else if (htab->elf.splt != NULL)
2432 sreloc = htab->elf.srelgot;
2434 sreloc = htab->elf.irelplt;
2435 elf_append_rel (output_bfd, sreloc, &outrel);
2437 /* If this reloc is against an external symbol, we
2438 do not want to fiddle with the addend. Otherwise,
2439 we need to include the symbol value so that it
2440 becomes an addend for the dynamic reloc. For an
2441 internal symbol, we have updated addend. */
2450 relocation -= (gotplt->output_section->vma
2451 + gotplt->output_offset);
2457 resolved_to_zero = (eh != NULL
2458 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2464 /* Relocation is to the entry for this symbol in the global
2466 if (htab->elf.sgot == NULL)
2469 relative_reloc = FALSE;
2472 off = h->got.offset;
2473 if (RESOLVED_LOCALLY_P (info, h, htab))
2475 /* We must initialize this entry in the global offset
2476 table. Since the offset must always be a multiple
2477 of 4, we use the least significant bit to record
2478 whether we have initialized it already.
2480 When doing a dynamic link, we create a .rel.got
2481 relocation entry to initialize the value. This
2482 is done in the finish_dynamic_symbol routine. */
2487 bfd_put_32 (output_bfd, relocation,
2488 htab->elf.sgot->contents + off);
2491 if (GENERATE_RELATIVE_RELOC_P (info, h))
2493 /* PR ld/21402: If this symbol isn't dynamic
2494 in PIC, generate R_386_RELATIVE here. */
2495 eh->no_finish_dynamic_symbol = 1;
2496 relative_reloc = TRUE;
2501 unresolved_reloc = FALSE;
2505 if (local_got_offsets == NULL)
2508 off = local_got_offsets[r_symndx];
2510 /* The offset must always be a multiple of 4. We use
2511 the least significant bit to record whether we have
2512 already generated the necessary reloc. */
2517 bfd_put_32 (output_bfd, relocation,
2518 htab->elf.sgot->contents + off);
2519 local_got_offsets[r_symndx] |= 1;
2521 if (bfd_link_pic (info))
2522 relative_reloc = TRUE;
2529 Elf_Internal_Rela outrel;
2531 s = htab->elf.srelgot;
2535 outrel.r_offset = (htab->elf.sgot->output_section->vma
2536 + htab->elf.sgot->output_offset
2538 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2539 elf_append_rel (output_bfd, s, &outrel);
2542 if (off >= (bfd_vma) -2)
2545 relocation = (htab->elf.sgot->output_section->vma
2546 + htab->elf.sgot->output_offset + off);
2547 if (rel->r_offset > 1
2548 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2549 && *(contents + rel->r_offset - 2) != 0x8d)
2551 if (bfd_link_pic (info))
2553 /* For PIC, disallow R_386_GOT32 without a base
2554 register, except for "lea foo@GOT, %reg", since
2555 we don't know what the GOT base is. */
2559 if (h == NULL || h->root.root.string == NULL)
2560 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2563 name = h->root.root.string;
2566 /* xgettext:c-format */
2567 (_("%pB: direct GOT relocation %s against `%s'"
2568 " without base register can not be used"
2569 " when making a shared object"),
2570 input_bfd, howto->name, name);
2571 bfd_set_error (bfd_error_bad_value);
2577 /* Subtract the .got.plt section address only with a base
2579 relocation -= (htab->elf.sgotplt->output_section->vma
2580 + htab->elf.sgotplt->output_offset);
2586 /* Relocation is relative to the start of the global offset
2589 /* Check to make sure it isn't a protected function or data
2590 symbol for shared library since it may not be local when
2591 used as function address or with copy relocation. We also
2592 need to make sure that a symbol is referenced locally. */
2593 if (!bfd_link_executable (info) && h)
2595 if (!h->def_regular)
2599 switch (ELF_ST_VISIBILITY (h->other))
2602 v = _("hidden symbol");
2605 v = _("internal symbol");
2608 v = _("protected symbol");
2616 /* xgettext:c-format */
2617 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2618 " `%s' can not be used when making a shared object"),
2619 input_bfd, v, h->root.root.string);
2620 bfd_set_error (bfd_error_bad_value);
2623 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2624 && (h->type == STT_FUNC
2625 || h->type == STT_OBJECT)
2626 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2629 /* xgettext:c-format */
2630 (_("%pB: relocation R_386_GOTOFF against protected %s"
2631 " `%s' can not be used when making a shared object"),
2633 h->type == STT_FUNC ? "function" : "data",
2634 h->root.root.string);
2635 bfd_set_error (bfd_error_bad_value);
2640 /* Note that sgot is not involved in this
2641 calculation. We always want the start of .got.plt. If we
2642 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2643 permitted by the ABI, we might have to change this
2645 relocation -= htab->elf.sgotplt->output_section->vma
2646 + htab->elf.sgotplt->output_offset;
2650 /* Use global offset table as symbol value. */
2651 relocation = htab->elf.sgotplt->output_section->vma
2652 + htab->elf.sgotplt->output_offset;
2653 unresolved_reloc = FALSE;
2657 /* Relocation is to the entry for this symbol in the
2658 procedure linkage table. */
2660 /* Resolve a PLT32 reloc against a local symbol directly,
2661 without using the procedure linkage table. */
2665 if ((h->plt.offset == (bfd_vma) -1
2666 && eh->plt_got.offset == (bfd_vma) -1)
2667 || htab->elf.splt == NULL)
2669 /* We didn't make a PLT entry for this symbol. This
2670 happens when statically linking PIC code, or when
2671 using -Bsymbolic. */
2675 if (h->plt.offset != (bfd_vma) -1)
2677 if (htab->plt_second != NULL)
2679 resolved_plt = htab->plt_second;
2680 plt_offset = eh->plt_second.offset;
2684 resolved_plt = htab->elf.splt;
2685 plt_offset = h->plt.offset;
2690 resolved_plt = htab->plt_got;
2691 plt_offset = eh->plt_got.offset;
2694 relocation = (resolved_plt->output_section->vma
2695 + resolved_plt->output_offset
2697 unresolved_reloc = FALSE;
2701 /* Set to symbol size. */
2702 relocation = st_size;
2707 if ((input_section->flags & SEC_ALLOC) == 0
2711 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2712 FALSE, resolved_to_zero,
2713 (r_type == R_386_PC32)))
2715 Elf_Internal_Rela outrel;
2716 bfd_boolean skip, relocate;
2719 /* When generating a shared object, these relocations
2720 are copied into the output file to be resolved at run
2727 _bfd_elf_section_offset (output_bfd, info, input_section,
2729 if (outrel.r_offset == (bfd_vma) -1)
2731 else if (outrel.r_offset == (bfd_vma) -2)
2732 skip = TRUE, relocate = TRUE;
2733 outrel.r_offset += (input_section->output_section->vma
2734 + input_section->output_offset);
2737 memset (&outrel, 0, sizeof outrel);
2738 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2739 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2742 /* This symbol is local, or marked to become local. */
2744 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2747 sreloc = elf_section_data (input_section)->sreloc;
2749 if (sreloc == NULL || sreloc->contents == NULL)
2751 r = bfd_reloc_notsupported;
2752 goto check_relocation_error;
2755 elf_append_rel (output_bfd, sreloc, &outrel);
2757 /* If this reloc is against an external symbol, we do
2758 not want to fiddle with the addend. Otherwise, we
2759 need to include the symbol value so that it becomes
2760 an addend for the dynamic reloc. */
2767 if (!bfd_link_executable (info))
2769 Elf_Internal_Rela outrel;
2772 outrel.r_offset = rel->r_offset
2773 + input_section->output_section->vma
2774 + input_section->output_offset;
2775 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2776 sreloc = elf_section_data (input_section)->sreloc;
2779 elf_append_rel (output_bfd, sreloc, &outrel);
2784 case R_386_TLS_GOTDESC:
2785 case R_386_TLS_DESC_CALL:
2786 case R_386_TLS_IE_32:
2787 case R_386_TLS_GOTIE:
2788 tls_type = GOT_UNKNOWN;
2789 if (h == NULL && local_got_offsets)
2790 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2792 tls_type = elf_x86_hash_entry(h)->tls_type;
2793 if (tls_type == GOT_TLS_IE)
2794 tls_type = GOT_TLS_IE_NEG;
2796 r_type_tls = r_type;
2797 if (! elf_i386_tls_transition (info, input_bfd,
2798 input_section, contents,
2799 symtab_hdr, sym_hashes,
2800 &r_type_tls, tls_type, rel,
2801 relend, h, r_symndx, TRUE))
2804 if (r_type_tls == R_386_TLS_LE_32)
2806 BFD_ASSERT (! unresolved_reloc);
2807 if (r_type == R_386_TLS_GD)
2812 /* GD->LE transition. */
2813 type = *(contents + rel->r_offset - 2);
2817 leal foo@tlsgd(,%ebx,1), %eax
2818 call ___tls_get_addr@PLT
2821 subl $foo@tpoff, %eax
2822 (6 byte form of subl). */
2823 roff = rel->r_offset + 5;
2828 leal foo@tlsgd(%ebx), %eax
2829 call ___tls_get_addr@PLT
2832 leal foo@tlsgd(%reg), %eax
2833 call *___tls_get_addr@GOT(%reg)
2834 which may be converted to
2835 addr32 call ___tls_get_addr
2837 movl %gs:0, %eax; subl $foo@tpoff, %eax
2838 (6 byte form of subl). */
2839 roff = rel->r_offset + 6;
2841 memcpy (contents + roff - 8,
2842 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2843 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2845 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2850 else if (r_type == R_386_TLS_GOTDESC)
2852 /* GDesc -> LE transition.
2853 It's originally something like:
2854 leal x@tlsdesc(%ebx), %eax
2858 Registers other than %eax may be set up here. */
2863 roff = rel->r_offset;
2864 val = bfd_get_8 (input_bfd, contents + roff - 1);
2866 /* Now modify the instruction as appropriate. */
2867 /* aoliva FIXME: remove the above and xor the byte
2869 bfd_put_8 (output_bfd, val ^ 0x86,
2870 contents + roff - 1);
2871 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2875 else if (r_type == R_386_TLS_DESC_CALL)
2877 /* GDesc -> LE transition.
2885 roff = rel->r_offset;
2886 bfd_put_8 (output_bfd, 0x66, contents + roff);
2887 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2890 else if (r_type == R_386_TLS_IE)
2894 /* IE->LE transition:
2895 Originally it can be one of:
2903 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2906 /* movl foo, %eax. */
2907 bfd_put_8 (output_bfd, 0xb8,
2908 contents + rel->r_offset - 1);
2914 type = bfd_get_8 (input_bfd,
2915 contents + rel->r_offset - 2);
2920 bfd_put_8 (output_bfd, 0xc7,
2921 contents + rel->r_offset - 2);
2922 bfd_put_8 (output_bfd,
2923 0xc0 | ((val >> 3) & 7),
2924 contents + rel->r_offset - 1);
2928 bfd_put_8 (output_bfd, 0x81,
2929 contents + rel->r_offset - 2);
2930 bfd_put_8 (output_bfd,
2931 0xc0 | ((val >> 3) & 7),
2932 contents + rel->r_offset - 1);
2939 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2940 contents + rel->r_offset);
2945 unsigned int val, type;
2947 /* {IE_32,GOTIE}->LE transition:
2948 Originally it can be one of:
2949 subl foo(%reg1), %reg2
2950 movl foo(%reg1), %reg2
2951 addl foo(%reg1), %reg2
2954 movl $foo, %reg2 (6 byte form)
2955 addl $foo, %reg2. */
2956 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2957 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2961 bfd_put_8 (output_bfd, 0xc7,
2962 contents + rel->r_offset - 2);
2963 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2964 contents + rel->r_offset - 1);
2966 else if (type == 0x2b)
2969 bfd_put_8 (output_bfd, 0x81,
2970 contents + rel->r_offset - 2);
2971 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2972 contents + rel->r_offset - 1);
2974 else if (type == 0x03)
2977 bfd_put_8 (output_bfd, 0x81,
2978 contents + rel->r_offset - 2);
2979 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2980 contents + rel->r_offset - 1);
2984 if (r_type == R_386_TLS_GOTIE)
2985 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2986 contents + rel->r_offset);
2988 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2989 contents + rel->r_offset);
2994 if (htab->elf.sgot == NULL)
2999 off = h->got.offset;
3000 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3004 if (local_got_offsets == NULL)
3007 off = local_got_offsets[r_symndx];
3008 offplt = local_tlsdesc_gotents[r_symndx];
3015 Elf_Internal_Rela outrel;
3019 if (htab->elf.srelgot == NULL)
3022 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3024 if (GOT_TLS_GDESC_P (tls_type))
3027 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3028 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3029 <= htab->elf.sgotplt->size);
3030 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3031 + htab->elf.sgotplt->output_offset
3033 + htab->sgotplt_jump_table_size);
3034 sreloc = htab->elf.srelplt;
3035 loc = sreloc->contents;
3036 loc += (htab->next_tls_desc_index++
3037 * sizeof (Elf32_External_Rel));
3038 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3039 <= sreloc->contents + sreloc->size);
3040 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3043 BFD_ASSERT (! unresolved_reloc);
3044 bfd_put_32 (output_bfd,
3045 relocation - _bfd_x86_elf_dtpoff_base (info),
3046 htab->elf.sgotplt->contents + offplt
3047 + htab->sgotplt_jump_table_size + 4);
3051 bfd_put_32 (output_bfd, 0,
3052 htab->elf.sgotplt->contents + offplt
3053 + htab->sgotplt_jump_table_size + 4);
3057 sreloc = htab->elf.srelgot;
3059 outrel.r_offset = (htab->elf.sgot->output_section->vma
3060 + htab->elf.sgot->output_offset + off);
3062 if (GOT_TLS_GD_P (tls_type))
3063 dr_type = R_386_TLS_DTPMOD32;
3064 else if (GOT_TLS_GDESC_P (tls_type))
3066 else if (tls_type == GOT_TLS_IE_POS)
3067 dr_type = R_386_TLS_TPOFF;
3069 dr_type = R_386_TLS_TPOFF32;
3071 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3072 bfd_put_32 (output_bfd,
3073 relocation - _bfd_x86_elf_dtpoff_base (info),
3074 htab->elf.sgot->contents + off);
3075 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3076 bfd_put_32 (output_bfd,
3077 _bfd_x86_elf_dtpoff_base (info) - relocation,
3078 htab->elf.sgot->contents + off);
3079 else if (dr_type != R_386_TLS_DESC)
3080 bfd_put_32 (output_bfd, 0,
3081 htab->elf.sgot->contents + off);
3082 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3084 elf_append_rel (output_bfd, sreloc, &outrel);
3086 if (GOT_TLS_GD_P (tls_type))
3090 BFD_ASSERT (! unresolved_reloc);
3091 bfd_put_32 (output_bfd,
3092 relocation - _bfd_x86_elf_dtpoff_base (info),
3093 htab->elf.sgot->contents + off + 4);
3097 bfd_put_32 (output_bfd, 0,
3098 htab->elf.sgot->contents + off + 4);
3099 outrel.r_info = ELF32_R_INFO (indx,
3100 R_386_TLS_DTPOFF32);
3101 outrel.r_offset += 4;
3102 elf_append_rel (output_bfd, sreloc, &outrel);
3105 else if (tls_type == GOT_TLS_IE_BOTH)
3107 bfd_put_32 (output_bfd,
3109 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3111 htab->elf.sgot->contents + off + 4);
3112 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3113 outrel.r_offset += 4;
3114 elf_append_rel (output_bfd, sreloc, &outrel);
3121 local_got_offsets[r_symndx] |= 1;
3124 if (off >= (bfd_vma) -2
3125 && ! GOT_TLS_GDESC_P (tls_type))
3127 if (r_type_tls == R_386_TLS_GOTDESC
3128 || r_type_tls == R_386_TLS_DESC_CALL)
3130 relocation = htab->sgotplt_jump_table_size + offplt;
3131 unresolved_reloc = FALSE;
3133 else if (r_type_tls == r_type)
3135 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3136 + htab->elf.sgotplt->output_offset;
3137 relocation = htab->elf.sgot->output_section->vma
3138 + htab->elf.sgot->output_offset + off - g_o_t;
3139 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3140 && tls_type == GOT_TLS_IE_BOTH)
3142 if (r_type == R_386_TLS_IE)
3143 relocation += g_o_t;
3144 unresolved_reloc = FALSE;
3146 else if (r_type == R_386_TLS_GD)
3148 unsigned int val, type;
3151 /* GD->IE transition. */
3152 type = *(contents + rel->r_offset - 2);
3153 val = *(contents + rel->r_offset - 1);
3157 leal foo@tlsgd(,%ebx,1), %eax
3158 call ___tls_get_addr@PLT
3161 subl $foo@gottpoff(%ebx), %eax. */
3163 roff = rel->r_offset - 3;
3168 leal foo@tlsgd(%ebx), %eax
3169 call ___tls_get_addr@PLT
3172 leal foo@tlsgd(%reg), %eax
3173 call *___tls_get_addr@GOT(%reg)
3174 which may be converted to
3175 addr32 call ___tls_get_addr
3178 subl $foo@gottpoff(%reg), %eax. */
3179 roff = rel->r_offset - 2;
3181 memcpy (contents + roff,
3182 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3183 contents[roff + 7] = 0x80 | (val & 7);
3184 /* If foo is used only with foo@gotntpoff(%reg) and
3185 foo@indntpoff, but not with foo@gottpoff(%reg), change
3186 subl $foo@gottpoff(%reg), %eax
3188 addl $foo@gotntpoff(%reg), %eax. */
3189 if (tls_type == GOT_TLS_IE_POS)
3190 contents[roff + 6] = 0x03;
3191 bfd_put_32 (output_bfd,
3192 htab->elf.sgot->output_section->vma
3193 + htab->elf.sgot->output_offset + off
3194 - htab->elf.sgotplt->output_section->vma
3195 - htab->elf.sgotplt->output_offset,
3196 contents + roff + 8);
3197 /* Skip R_386_PLT32 and R_386_GOT32X. */
3202 else if (r_type == R_386_TLS_GOTDESC)
3204 /* GDesc -> IE transition.
3205 It's originally something like:
3206 leal x@tlsdesc(%ebx), %eax
3209 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3211 movl x@gottpoff(%ebx), %eax # before negl %eax
3213 Registers other than %eax may be set up here. */
3217 /* First, make sure it's a leal adding ebx to a 32-bit
3218 offset into any register, although it's probably
3219 almost always going to be eax. */
3220 roff = rel->r_offset;
3222 /* Now modify the instruction as appropriate. */
3223 /* To turn a leal into a movl in the form we use it, it
3224 suffices to change the first byte from 0x8d to 0x8b.
3225 aoliva FIXME: should we decide to keep the leal, all
3226 we have to do is remove the statement below, and
3227 adjust the relaxation of R_386_TLS_DESC_CALL. */
3228 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3230 if (tls_type == GOT_TLS_IE_BOTH)
3233 bfd_put_32 (output_bfd,
3234 htab->elf.sgot->output_section->vma
3235 + htab->elf.sgot->output_offset + off
3236 - htab->elf.sgotplt->output_section->vma
3237 - htab->elf.sgotplt->output_offset,
3241 else if (r_type == R_386_TLS_DESC_CALL)
3243 /* GDesc -> IE transition.
3251 depending on how we transformed the TLS_GOTDESC above.
3256 roff = rel->r_offset;
3258 /* Now modify the instruction as appropriate. */
3259 if (tls_type != GOT_TLS_IE_NEG)
3262 bfd_put_8 (output_bfd, 0x66, contents + roff);
3263 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3268 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3269 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3279 if (! elf_i386_tls_transition (info, input_bfd,
3280 input_section, contents,
3281 symtab_hdr, sym_hashes,
3282 &r_type, GOT_UNKNOWN, rel,
3283 relend, h, r_symndx, TRUE))
3286 if (r_type != R_386_TLS_LDM)
3288 /* LD->LE transition. Change
3289 leal foo@tlsldm(%ebx) %eax
3290 call ___tls_get_addr@PLT
3294 leal 0(%esi,1), %esi
3296 leal foo@tlsldm(%reg) %eax
3297 call *___tls_get_addr@GOT(%reg)
3298 which may be converted to
3299 addr32 call ___tls_get_addr
3302 leal 0(%esi), %esi */
3303 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3304 if (*(contents + rel->r_offset + 4) == 0xff
3305 || *(contents + rel->r_offset + 4) == 0x67)
3306 memcpy (contents + rel->r_offset - 2,
3307 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3309 memcpy (contents + rel->r_offset - 2,
3310 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3311 /* Skip R_386_PC32/R_386_PLT32. */
3317 if (htab->elf.sgot == NULL)
3320 off = htab->tls_ld_or_ldm_got.offset;
3325 Elf_Internal_Rela outrel;
3327 if (htab->elf.srelgot == NULL)
3330 outrel.r_offset = (htab->elf.sgot->output_section->vma
3331 + htab->elf.sgot->output_offset + off);
3333 bfd_put_32 (output_bfd, 0,
3334 htab->elf.sgot->contents + off);
3335 bfd_put_32 (output_bfd, 0,
3336 htab->elf.sgot->contents + off + 4);
3337 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3338 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3339 htab->tls_ld_or_ldm_got.offset |= 1;
3341 relocation = htab->elf.sgot->output_section->vma
3342 + htab->elf.sgot->output_offset + off
3343 - htab->elf.sgotplt->output_section->vma
3344 - htab->elf.sgotplt->output_offset;
3345 unresolved_reloc = FALSE;
3348 case R_386_TLS_LDO_32:
3349 if (!bfd_link_executable (info)
3350 || (input_section->flags & SEC_CODE) == 0)
3351 relocation -= _bfd_x86_elf_dtpoff_base (info);
3353 /* When converting LDO to LE, we must negate. */
3354 relocation = -elf_i386_tpoff (info, relocation);
3357 case R_386_TLS_LE_32:
3359 if (!bfd_link_executable (info))
3361 Elf_Internal_Rela outrel;
3364 outrel.r_offset = rel->r_offset
3365 + input_section->output_section->vma
3366 + input_section->output_offset;
3367 if (h != NULL && h->dynindx != -1)
3371 if (r_type == R_386_TLS_LE_32)
3372 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3374 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3375 sreloc = elf_section_data (input_section)->sreloc;
3378 elf_append_rel (output_bfd, sreloc, &outrel);
3381 else if (r_type == R_386_TLS_LE_32)
3382 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3384 relocation -= _bfd_x86_elf_dtpoff_base (info);
3386 else if (r_type == R_386_TLS_LE_32)
3387 relocation = elf_i386_tpoff (info, relocation);
3389 relocation = -elf_i386_tpoff (info, relocation);
3396 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3397 because such sections are not SEC_ALLOC and thus ld.so will
3398 not process them. */
3399 if (unresolved_reloc
3400 && !((input_section->flags & SEC_DEBUGGING) != 0
3402 && _bfd_elf_section_offset (output_bfd, info, input_section,
3403 rel->r_offset) != (bfd_vma) -1)
3406 /* xgettext:c-format */
3407 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3410 (uint64_t) rel->r_offset,
3412 h->root.root.string);
3417 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3418 contents, rel->r_offset,
3421 check_relocation_error:
3422 if (r != bfd_reloc_ok)
3427 name = h->root.root.string;
3430 name = bfd_elf_string_from_elf_section (input_bfd,
3431 symtab_hdr->sh_link,
3436 name = bfd_section_name (input_bfd, sec);
3439 if (r == bfd_reloc_overflow)
3440 (*info->callbacks->reloc_overflow)
3441 (info, (h ? &h->root : NULL), name, howto->name,
3442 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3446 /* xgettext:c-format */
3447 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3448 input_bfd, input_section,
3449 (uint64_t) rel->r_offset, name, (int) r);
3460 Elf_Internal_Shdr *rel_hdr;
3461 size_t deleted = rel - wrel;
3463 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3464 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3465 if (rel_hdr->sh_size == 0)
3467 /* It is too late to remove an empty reloc section. Leave
3469 ??? What is wrong with an empty section??? */
3470 rel_hdr->sh_size = rel_hdr->sh_entsize;
3473 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3474 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3475 input_section->reloc_count -= deleted;
3481 /* Finish up dynamic symbol handling. We set the contents of various
3482 dynamic sections here. */
3485 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3486 struct bfd_link_info *info,
3487 struct elf_link_hash_entry *h,
3488 Elf_Internal_Sym *sym)
3490 struct elf_x86_link_hash_table *htab;
3491 unsigned plt_entry_size;
3492 struct elf_x86_link_hash_entry *eh;
3493 bfd_boolean local_undefweak;
3494 bfd_boolean use_plt_second;
3496 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3500 plt_entry_size = htab->plt.plt_entry_size;
3502 /* Use the second PLT section only if there is .plt section. */
3503 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3505 eh = (struct elf_x86_link_hash_entry *) h;
3506 if (eh->no_finish_dynamic_symbol)
3509 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3510 resolved undefined weak symbols in executable so that their
3511 references have value 0 at run-time. */
3512 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3514 if (h->plt.offset != (bfd_vma) -1)
3516 bfd_vma plt_index, plt_offset;
3518 Elf_Internal_Rela rel;
3520 asection *plt, *resolved_plt, *gotplt, *relplt;
3522 /* When building a static executable, use .iplt, .igot.plt and
3523 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3524 if (htab->elf.splt != NULL)
3526 plt = htab->elf.splt;
3527 gotplt = htab->elf.sgotplt;
3528 relplt = htab->elf.srelplt;
3532 plt = htab->elf.iplt;
3533 gotplt = htab->elf.igotplt;
3534 relplt = htab->elf.irelplt;
3537 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3539 /* Get the index in the procedure linkage table which
3540 corresponds to this symbol. This is the index of this symbol
3541 in all the symbols for which we are making plt entries. The
3542 first entry in the procedure linkage table is reserved.
3544 Get the offset into the .got table of the entry that
3545 corresponds to this function. Each .got entry is 4 bytes.
3546 The first three are reserved.
3548 For static executables, we don't reserve anything. */
3550 if (plt == htab->elf.splt)
3552 got_offset = (h->plt.offset / plt_entry_size
3553 - htab->plt.has_plt0);
3554 got_offset = (got_offset + 3) * 4;
3558 got_offset = h->plt.offset / plt_entry_size;
3559 got_offset = got_offset * 4;
3562 /* Fill in the entry in the procedure linkage table and update
3564 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3569 const bfd_byte *plt_entry;
3570 if (bfd_link_pic (info))
3571 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3573 plt_entry = htab->non_lazy_plt->plt_entry;
3574 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3575 plt_entry, htab->non_lazy_plt->plt_entry_size);
3577 resolved_plt = htab->plt_second;
3578 plt_offset = eh->plt_second.offset;
3583 plt_offset = h->plt.offset;
3586 if (! bfd_link_pic (info))
3588 bfd_put_32 (output_bfd,
3589 (gotplt->output_section->vma
3590 + gotplt->output_offset
3592 resolved_plt->contents + plt_offset
3593 + htab->plt.plt_got_offset);
3595 if (htab->target_os == is_vxworks)
3597 int s, k, reloc_index;
3599 /* Create the R_386_32 relocation referencing the GOT
3600 for this PLT entry. */
3602 /* S: Current slot number (zero-based). */
3603 s = ((h->plt.offset - htab->plt.plt_entry_size)
3604 / htab->plt.plt_entry_size);
3605 /* K: Number of relocations for PLTResolve. */
3606 if (bfd_link_pic (info))
3607 k = PLTRESOLVE_RELOCS_SHLIB;
3609 k = PLTRESOLVE_RELOCS;
3610 /* Skip the PLTresolve relocations, and the relocations for
3611 the other PLT slots. */
3612 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3613 loc = (htab->srelplt2->contents + reloc_index
3614 * sizeof (Elf32_External_Rel));
3616 rel.r_offset = (plt->output_section->vma
3617 + plt->output_offset
3618 + h->plt.offset + 2),
3619 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3620 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3622 /* Create the R_386_32 relocation referencing the beginning of
3623 the PLT for this GOT entry. */
3624 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3625 + htab->elf.sgotplt->output_offset
3627 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3628 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3629 loc + sizeof (Elf32_External_Rel));
3634 bfd_put_32 (output_bfd, got_offset,
3635 resolved_plt->contents + plt_offset
3636 + htab->plt.plt_got_offset);
3639 /* Fill in the entry in the global offset table. Leave the entry
3640 as zero for undefined weak symbol in PIE. No PLT relocation
3641 against undefined weak symbol in PIE. */
3642 if (!local_undefweak)
3644 if (htab->plt.has_plt0)
3645 bfd_put_32 (output_bfd,
3646 (plt->output_section->vma
3647 + plt->output_offset
3649 + htab->lazy_plt->plt_lazy_offset),
3650 gotplt->contents + got_offset);
3652 /* Fill in the entry in the .rel.plt section. */
3653 rel.r_offset = (gotplt->output_section->vma
3654 + gotplt->output_offset
3656 if (PLT_LOCAL_IFUNC_P (info, h))
3658 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3659 h->root.root.string,
3660 h->root.u.def.section->owner);
3662 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3663 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3664 in the .got.plt section. */
3665 bfd_put_32 (output_bfd,
3666 (h->root.u.def.value
3667 + h->root.u.def.section->output_section->vma
3668 + h->root.u.def.section->output_offset),
3669 gotplt->contents + got_offset);
3670 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3671 /* R_386_IRELATIVE comes last. */
3672 plt_index = htab->next_irelative_index--;
3676 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3677 plt_index = htab->next_jump_slot_index++;
3680 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3681 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3683 /* Don't fill the second and third slots in PLT entry for
3684 static executables nor without PLT0. */
3685 if (plt == htab->elf.splt && htab->plt.has_plt0)
3687 bfd_put_32 (output_bfd,
3688 plt_index * sizeof (Elf32_External_Rel),
3689 plt->contents + h->plt.offset
3690 + htab->lazy_plt->plt_reloc_offset);
3691 bfd_put_32 (output_bfd,
3693 + htab->lazy_plt->plt_plt_offset + 4),
3694 (plt->contents + h->plt.offset
3695 + htab->lazy_plt->plt_plt_offset));
3699 else if (eh->plt_got.offset != (bfd_vma) -1)
3701 bfd_vma got_offset, plt_offset;
3702 asection *plt, *got, *gotplt;
3703 const bfd_byte *got_plt_entry;
3705 /* Set the entry in the GOT procedure linkage table. */
3706 plt = htab->plt_got;
3707 got = htab->elf.sgot;
3708 gotplt = htab->elf.sgotplt;
3709 got_offset = h->got.offset;
3711 if (got_offset == (bfd_vma) -1
3717 /* Fill in the entry in the GOT procedure linkage table. */
3718 if (! bfd_link_pic (info))
3720 got_plt_entry = htab->non_lazy_plt->plt_entry;
3721 got_offset += got->output_section->vma + got->output_offset;
3725 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3726 got_offset += (got->output_section->vma
3727 + got->output_offset
3728 - gotplt->output_section->vma
3729 - gotplt->output_offset);
3732 plt_offset = eh->plt_got.offset;
3733 memcpy (plt->contents + plt_offset, got_plt_entry,
3734 htab->non_lazy_plt->plt_entry_size);
3735 bfd_put_32 (output_bfd, got_offset,
3736 (plt->contents + plt_offset
3737 + htab->non_lazy_plt->plt_got_offset));
3740 if (!local_undefweak
3742 && (h->plt.offset != (bfd_vma) -1
3743 || eh->plt_got.offset != (bfd_vma) -1))
3745 /* Mark the symbol as undefined, rather than as defined in
3746 the .plt section. Leave the value if there were any
3747 relocations where pointer equality matters (this is a clue
3748 for the dynamic linker, to make function pointer
3749 comparisons work between an application and shared
3750 library), otherwise set it to zero. If a function is only
3751 called from a binary, there is no need to slow down
3752 shared libraries because of that. */
3753 sym->st_shndx = SHN_UNDEF;
3754 if (!h->pointer_equality_needed)
3758 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3760 /* Don't generate dynamic GOT relocation against undefined weak
3761 symbol in executable. */
3762 if (h->got.offset != (bfd_vma) -1
3763 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3764 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3765 && !local_undefweak)
3767 Elf_Internal_Rela rel;
3768 asection *relgot = htab->elf.srelgot;
3770 /* This symbol has an entry in the global offset table. Set it
3773 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3776 rel.r_offset = (htab->elf.sgot->output_section->vma
3777 + htab->elf.sgot->output_offset
3778 + (h->got.offset & ~(bfd_vma) 1));
3780 /* If this is a static link, or it is a -Bsymbolic link and the
3781 symbol is defined locally or was forced to be local because
3782 of a version file, we just want to emit a RELATIVE reloc.
3783 The entry in the global offset table will already have been
3784 initialized in the relocate_section function. */
3786 && h->type == STT_GNU_IFUNC)
3788 if (h->plt.offset == (bfd_vma) -1)
3790 /* STT_GNU_IFUNC is referenced without PLT. */
3791 if (htab->elf.splt == NULL)
3793 /* use .rel[a].iplt section to store .got relocations
3794 in static executable. */
3795 relgot = htab->elf.irelplt;
3797 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3799 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3800 h->root.root.string,
3801 h->root.u.def.section->owner);
3803 bfd_put_32 (output_bfd,
3804 (h->root.u.def.value
3805 + h->root.u.def.section->output_section->vma
3806 + h->root.u.def.section->output_offset),
3807 htab->elf.sgot->contents + h->got.offset);
3808 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3813 else if (bfd_link_pic (info))
3815 /* Generate R_386_GLOB_DAT. */
3823 if (!h->pointer_equality_needed)
3826 /* For non-shared object, we can't use .got.plt, which
3827 contains the real function addres if we need pointer
3828 equality. We load the GOT entry with the PLT entry. */
3829 if (htab->plt_second != NULL)
3831 plt = htab->plt_second;
3832 plt_offset = eh->plt_second.offset;
3836 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3837 plt_offset = h->plt.offset;
3839 bfd_put_32 (output_bfd,
3840 (plt->output_section->vma
3841 + plt->output_offset + plt_offset),
3842 htab->elf.sgot->contents + h->got.offset);
3846 else if (bfd_link_pic (info)
3847 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3849 BFD_ASSERT((h->got.offset & 1) != 0);
3850 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3854 BFD_ASSERT((h->got.offset & 1) == 0);
3856 bfd_put_32 (output_bfd, (bfd_vma) 0,
3857 htab->elf.sgot->contents + h->got.offset);
3858 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3861 elf_append_rel (output_bfd, relgot, &rel);
3866 Elf_Internal_Rela rel;
3869 /* This symbol needs a copy reloc. Set it up. */
3870 VERIFY_COPY_RELOC (h, htab)
3872 rel.r_offset = (h->root.u.def.value
3873 + h->root.u.def.section->output_section->vma
3874 + h->root.u.def.section->output_offset);
3875 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3876 if (h->root.u.def.section == htab->elf.sdynrelro)
3877 s = htab->elf.sreldynrelro;
3879 s = htab->elf.srelbss;
3880 elf_append_rel (output_bfd, s, &rel);
3886 /* Finish up local dynamic symbol handling. We set the contents of
3887 various dynamic sections here. */
3890 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3892 struct elf_link_hash_entry *h
3893 = (struct elf_link_hash_entry *) *slot;
3894 struct bfd_link_info *info
3895 = (struct bfd_link_info *) inf;
3897 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3901 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3902 here since undefined weak symbol may not be dynamic and may not be
3903 called for elf_i386_finish_dynamic_symbol. */
3906 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3909 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3910 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3912 if (h->root.type != bfd_link_hash_undefweak
3913 || h->dynindx != -1)
3916 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3920 /* Used to decide how to sort relocs in an optimal manner for the
3921 dynamic linker, before writing them out. */
3923 static enum elf_reloc_type_class
3924 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3925 const asection *rel_sec ATTRIBUTE_UNUSED,
3926 const Elf_Internal_Rela *rela)
3928 bfd *abfd = info->output_bfd;
3929 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3930 struct elf_link_hash_table *htab = elf_hash_table (info);
3932 if (htab->dynsym != NULL
3933 && htab->dynsym->contents != NULL)
3935 /* Check relocation against STT_GNU_IFUNC symbol if there are
3937 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3938 if (r_symndx != STN_UNDEF)
3940 Elf_Internal_Sym sym;
3941 if (!bed->s->swap_symbol_in (abfd,
3942 (htab->dynsym->contents
3943 + r_symndx * sizeof (Elf32_External_Sym)),
3947 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3948 return reloc_class_ifunc;
3952 switch (ELF32_R_TYPE (rela->r_info))
3954 case R_386_IRELATIVE:
3955 return reloc_class_ifunc;
3956 case R_386_RELATIVE:
3957 return reloc_class_relative;
3958 case R_386_JUMP_SLOT:
3959 return reloc_class_plt;
3961 return reloc_class_copy;
3963 return reloc_class_normal;
3967 /* Finish up the dynamic sections. */
3970 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3971 struct bfd_link_info *info)
3973 struct elf_x86_link_hash_table *htab;
3975 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3979 if (!htab->elf.dynamic_sections_created)
3982 if (htab->elf.splt && htab->elf.splt->size > 0)
3984 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3985 really seem like the right value. */
3986 elf_section_data (htab->elf.splt->output_section)
3987 ->this_hdr.sh_entsize = 4;
3989 if (htab->plt.has_plt0)
3991 /* Fill in the special first entry in the procedure linkage
3993 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
3994 htab->lazy_plt->plt0_entry_size);
3995 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
3996 htab->plt0_pad_byte,
3997 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
3998 if (!bfd_link_pic (info))
4000 bfd_put_32 (output_bfd,
4001 (htab->elf.sgotplt->output_section->vma
4002 + htab->elf.sgotplt->output_offset
4004 htab->elf.splt->contents
4005 + htab->lazy_plt->plt0_got1_offset);
4006 bfd_put_32 (output_bfd,
4007 (htab->elf.sgotplt->output_section->vma
4008 + htab->elf.sgotplt->output_offset
4010 htab->elf.splt->contents
4011 + htab->lazy_plt->plt0_got2_offset);
4013 if (htab->target_os == is_vxworks)
4015 Elf_Internal_Rela rel;
4016 int num_plts = (htab->elf.splt->size
4017 / htab->plt.plt_entry_size) - 1;
4019 asection *srelplt2 = htab->srelplt2;
4021 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4022 + 4. On IA32 we use REL relocations so the
4023 addend goes in the PLT directly. */
4024 rel.r_offset = (htab->elf.splt->output_section->vma
4025 + htab->elf.splt->output_offset
4026 + htab->lazy_plt->plt0_got1_offset);
4027 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4029 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4030 srelplt2->contents);
4031 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4033 rel.r_offset = (htab->elf.splt->output_section->vma
4034 + htab->elf.splt->output_offset
4035 + htab->lazy_plt->plt0_got2_offset);
4036 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4038 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4039 srelplt2->contents +
4040 sizeof (Elf32_External_Rel));
4041 /* Correct the .rel.plt.unloaded relocations. */
4042 p = srelplt2->contents;
4043 if (bfd_link_pic (info))
4044 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4046 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4048 for (; num_plts; num_plts--)
4050 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4051 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4053 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4054 p += sizeof (Elf32_External_Rel);
4056 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4057 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4059 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4060 p += sizeof (Elf32_External_Rel);
4067 /* Fill PLT entries for undefined weak symbols in PIE. */
4068 if (bfd_link_pie (info))
4069 bfd_hash_traverse (&info->hash->table,
4070 elf_i386_pie_finish_undefweak_symbol,
4076 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4077 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4078 It has to be done before elf_link_sort_relocs is called so that
4079 dynamic relocations are properly sorted. */
4082 elf_i386_output_arch_local_syms
4083 (bfd *output_bfd ATTRIBUTE_UNUSED,
4084 struct bfd_link_info *info,
4085 void *flaginfo ATTRIBUTE_UNUSED,
4086 int (*func) (void *, const char *,
4089 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4091 struct elf_x86_link_hash_table *htab
4092 = elf_x86_hash_table (info, I386_ELF_DATA);
4096 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4097 htab_traverse (htab->loc_hash_table,
4098 elf_i386_finish_local_dynamic_symbol,
4104 /* Forward declaration. */
4105 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4107 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4108 dynamic relocations. */
4111 elf_i386_get_synthetic_symtab (bfd *abfd,
4112 long symcount ATTRIBUTE_UNUSED,
4113 asymbol **syms ATTRIBUTE_UNUSED,
4120 bfd_byte *plt_contents;
4122 const struct elf_x86_lazy_plt_layout *lazy_plt;
4123 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4124 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4125 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4128 enum elf_x86_plt_type plt_type;
4129 struct elf_x86_plt plts[] =
4131 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4132 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4133 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4134 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4139 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4142 if (dynsymcount <= 0)
4145 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4149 non_lazy_plt = NULL;
4150 /* Silence GCC 6. */
4152 non_lazy_ibt_plt = NULL;
4153 lazy_ibt_plt = NULL;
4154 switch (get_elf_x86_backend_data (abfd)->target_os)
4158 non_lazy_plt = &elf_i386_non_lazy_plt;
4159 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4160 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4163 lazy_plt = &elf_i386_lazy_plt;
4166 lazy_plt = &elf_i386_nacl_plt;
4173 for (j = 0; plts[j].name != NULL; j++)
4175 plt = bfd_get_section_by_name (abfd, plts[j].name);
4176 if (plt == NULL || plt->size == 0)
4179 /* Get the PLT section contents. */
4180 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4181 if (plt_contents == NULL)
4183 if (!bfd_get_section_contents (abfd, (asection *) plt,
4184 plt_contents, 0, plt->size))
4186 free (plt_contents);
4190 /* Check what kind of PLT it is. */
4191 plt_type = plt_unknown;
4192 if (plts[j].type == plt_unknown
4193 && (plt->size >= (lazy_plt->plt0_entry_size
4194 + lazy_plt->plt_entry_size)))
4196 /* Match lazy PLT first. */
4197 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4198 lazy_plt->plt0_got1_offset) == 0)
4200 /* The fist entry in the lazy IBT PLT is the same as the
4202 if (lazy_ibt_plt != NULL
4203 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4204 lazy_ibt_plt->plt_entry,
4205 lazy_ibt_plt->plt_got_offset) == 0))
4206 plt_type = plt_lazy | plt_second;
4208 plt_type = plt_lazy;
4210 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4211 lazy_plt->plt0_got1_offset) == 0)
4213 /* The fist entry in the PIC lazy IBT PLT is the same as
4214 the normal PIC lazy PLT. */
4215 if (lazy_ibt_plt != NULL
4216 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4217 lazy_ibt_plt->pic_plt_entry,
4218 lazy_ibt_plt->plt_got_offset) == 0))
4219 plt_type = plt_lazy | plt_pic | plt_second;
4221 plt_type = plt_lazy | plt_pic;
4225 if (non_lazy_plt != NULL
4226 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4227 && plt->size >= non_lazy_plt->plt_entry_size)
4229 /* Match non-lazy PLT. */
4230 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4231 non_lazy_plt->plt_got_offset) == 0)
4232 plt_type = plt_non_lazy;
4233 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4234 non_lazy_plt->plt_got_offset) == 0)
4238 if ((non_lazy_ibt_plt != NULL)
4239 && (plt_type == plt_unknown || plt_type == plt_second)
4240 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4242 if (memcmp (plt_contents,
4243 non_lazy_ibt_plt->plt_entry,
4244 non_lazy_ibt_plt->plt_got_offset) == 0)
4246 /* Match IBT PLT. */
4247 plt_type = plt_second;
4248 non_lazy_plt = non_lazy_ibt_plt;
4250 else if (memcmp (plt_contents,
4251 non_lazy_ibt_plt->pic_plt_entry,
4252 non_lazy_ibt_plt->plt_got_offset) == 0)
4254 /* Match PIC IBT PLT. */
4255 plt_type = plt_second | plt_pic;
4256 non_lazy_plt = non_lazy_ibt_plt;
4260 if (plt_type == plt_unknown)
4262 free (plt_contents);
4267 plts[j].type = plt_type;
4269 if ((plt_type & plt_lazy))
4271 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4272 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4273 /* Skip PLT0 in lazy PLT. */
4278 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4279 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4283 /* Skip lazy PLT when the second PLT is used. */
4284 if ((plt_type & (plt_lazy | plt_second))
4285 == (plt_lazy | plt_second))
4289 n = plt->size / plts[j].plt_entry_size;
4294 plts[j].contents = plt_contents;
4296 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4297 if ((plt_type & plt_pic))
4298 got_addr = (bfd_vma) -1;
4301 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4302 got_addr, plts, dynsyms,
4306 /* Set up i386 GNU properties. Return the first relocatable ELF input
4307 with GNU properties if found. Otherwise, return NULL. */
4310 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4312 struct elf_x86_init_table init_table;
4314 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4318 init_table.plt0_pad_byte = 0x0;
4319 init_table.lazy_plt = &elf_i386_lazy_plt;
4320 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4321 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4322 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4325 init_table.plt0_pad_byte = 0x90;
4326 init_table.lazy_plt = &elf_i386_lazy_plt;
4327 init_table.non_lazy_plt = NULL;
4328 init_table.lazy_ibt_plt = NULL;
4329 init_table.non_lazy_ibt_plt = NULL;
4332 init_table.plt0_pad_byte = 0x90;
4333 init_table.lazy_plt = &elf_i386_nacl_plt;
4334 init_table.non_lazy_plt = NULL;
4335 init_table.lazy_ibt_plt = NULL;
4336 init_table.non_lazy_ibt_plt = NULL;
4340 init_table.r_info = elf32_r_info;
4341 init_table.r_sym = elf32_r_sym;
4343 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4346 #define TARGET_LITTLE_SYM i386_elf32_vec
4347 #define TARGET_LITTLE_NAME "elf32-i386"
4348 #define ELF_ARCH bfd_arch_i386
4349 #define ELF_TARGET_ID I386_ELF_DATA
4350 #define ELF_MACHINE_CODE EM_386
4351 #define ELF_MAXPAGESIZE 0x1000
4353 #define elf_backend_can_gc_sections 1
4354 #define elf_backend_can_refcount 1
4355 #define elf_backend_want_got_plt 1
4356 #define elf_backend_plt_readonly 1
4357 #define elf_backend_want_plt_sym 0
4358 #define elf_backend_got_header_size 12
4359 #define elf_backend_plt_alignment 4
4360 #define elf_backend_dtrel_excludes_plt 1
4361 #define elf_backend_extern_protected_data 1
4362 #define elf_backend_caches_rawsize 1
4363 #define elf_backend_want_dynrelro 1
4365 /* Support RELA for objdump of prelink objects. */
4366 #define elf_info_to_howto elf_i386_info_to_howto_rel
4367 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4369 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4370 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4371 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4372 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4374 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4375 #define elf_backend_check_relocs elf_i386_check_relocs
4376 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4377 #define elf_backend_fake_sections elf_i386_fake_sections
4378 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4379 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4380 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4381 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4382 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4383 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4384 #define elf_backend_relocate_section elf_i386_relocate_section
4385 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4386 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4388 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4390 #define elf32_bed elf32_i386_bed
4392 #include "elf32-target.h"
4394 /* FreeBSD support. */
4396 #undef TARGET_LITTLE_SYM
4397 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4398 #undef TARGET_LITTLE_NAME
4399 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4401 #define ELF_OSABI ELFOSABI_FREEBSD
4403 /* The kernel recognizes executables as valid only if they carry a
4404 "FreeBSD" label in the ELF header. So we put this label on all
4405 executables and (for simplicity) also all other object files. */
4408 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4410 _bfd_elf_post_process_headers (abfd, info);
4412 #ifdef OLD_FREEBSD_ABI_LABEL
4414 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4415 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4416 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4421 #undef elf_backend_post_process_headers
4422 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4424 #define elf32_bed elf32_i386_fbsd_bed
4426 #undef elf_backend_add_symbol_hook
4428 #include "elf32-target.h"
4432 #undef TARGET_LITTLE_SYM
4433 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4434 #undef TARGET_LITTLE_NAME
4435 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4437 static const struct elf_x86_backend_data elf_i386_solaris_arch_bed =
4442 #undef elf_backend_arch_data
4443 #define elf_backend_arch_data &elf_i386_solaris_arch_bed
4445 #undef elf_backend_post_process_headers
4447 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4448 objects won't be recognized. */
4452 #define elf32_bed elf32_i386_sol2_bed
4454 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4456 #undef elf_backend_static_tls_alignment
4457 #define elf_backend_static_tls_alignment 8
4459 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4461 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4463 #undef elf_backend_want_plt_sym
4464 #define elf_backend_want_plt_sym 1
4466 #undef elf_backend_strtab_flags
4467 #define elf_backend_strtab_flags SHF_STRINGS
4469 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4470 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4471 FALSE otherwise. ISECTION is the best guess matching section from the
4472 input bfd IBFD, but it might be NULL. */
4475 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4476 bfd *obfd ATTRIBUTE_UNUSED,
4477 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4478 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4480 /* PR 19938: FIXME: Need to add code for setting the sh_info
4481 and sh_link fields of Solaris specific section types. */
4484 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4485 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4487 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4489 The following values should be set:
4492 -----------------------------------------------------------------------------
4493 SHT_SUNW_ancillary The section header index of 0
4494 [0x6fffffee] the associated string table.
4496 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4497 [0x6ffffff0] the associated symbol table. section header index of
4499 SHT_SUNW_capchain table,
4502 SHT_SUNW_symsort The section header index of 0
4503 [0x6ffffff1] the associated symbol table.
4505 SHT_SUNW_tlssort The section header index of 0
4506 [0x6ffffff2] the associated symbol table.
4508 SHT_SUNW_LDYNSYM The section header index of One greater than the
4509 [0x6ffffff3] the associated string table. symbol table index of the
4510 This index is the same string last local symbol,
4511 table used by the SHT_DYNSYM STB_LOCAL. Since
4512 section. SHT_SUNW_LDYNSYM only
4513 contains local symbols,
4514 sh_info is equivalent to
4515 the number of symbols in
4518 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4519 [0x6ffffff5] the section header index of to named strings, the
4520 the associated section header index of
4521 SHT_SUNW_capinfo table, the associated string
4522 otherwise 0. table, otherwise 0.
4524 SHT_SUNW_move The section header index of 0
4525 [0x6ffffffa] the associated symbol table.
4530 SHT_SUNW_syminfo The section header index of The section header index
4531 [0x6ffffffc] the associated symbol table. of the associated
4534 SHT_SUNW_verdef The section header index of The number of version
4535 [0x6ffffffd] the associated string table. definitions within the
4538 SHT_SUNW_verneed The section header index of The number of version
4539 [0x6ffffffe] the associated string table. dependencies within the
4542 SHT_SUNW_versym The section header index of 0
4543 [0x6fffffff] the associated symbol table. */
4546 #undef elf_backend_copy_special_section_fields
4547 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4549 #include "elf32-target.h"
4551 /* Intel MCU support. */
4554 elf32_iamcu_elf_object_p (bfd *abfd)
4556 /* Set the right machine number for an IAMCU elf32 file. */
4557 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4561 #undef TARGET_LITTLE_SYM
4562 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4563 #undef TARGET_LITTLE_NAME
4564 #define TARGET_LITTLE_NAME "elf32-iamcu"
4566 #define ELF_ARCH bfd_arch_iamcu
4568 #undef ELF_MACHINE_CODE
4569 #define ELF_MACHINE_CODE EM_IAMCU
4571 #undef elf_backend_arch_data
4572 #define elf_backend_arch_data &elf_i386_arch_bed
4577 #define elf32_bed elf32_iamcu_bed
4579 #undef elf_backend_object_p
4580 #define elf_backend_object_p elf32_iamcu_elf_object_p
4582 #undef elf_backend_static_tls_alignment
4584 #undef elf_backend_want_plt_sym
4585 #define elf_backend_want_plt_sym 0
4587 #undef elf_backend_strtab_flags
4588 #undef elf_backend_copy_special_section_fields
4590 #include "elf32-target.h"
4592 /* Restore defaults. */
4594 #define ELF_ARCH bfd_arch_i386
4595 #undef ELF_MACHINE_CODE
4596 #define ELF_MACHINE_CODE EM_386
4598 /* Native Client support. */
4600 #undef TARGET_LITTLE_SYM
4601 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4602 #undef TARGET_LITTLE_NAME
4603 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4605 #define elf32_bed elf32_i386_nacl_bed
4607 #undef ELF_MAXPAGESIZE
4608 #define ELF_MAXPAGESIZE 0x10000
4610 /* Restore defaults. */
4612 #undef elf_backend_want_plt_sym
4613 #define elf_backend_want_plt_sym 0
4614 #undef elf_backend_post_process_headers
4615 #undef elf_backend_static_tls_alignment
4617 /* NaCl uses substantially different PLT entries for the same effects. */
4619 #undef elf_backend_plt_alignment
4620 #define elf_backend_plt_alignment 5
4621 #define NACL_PLT_ENTRY_SIZE 64
4622 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4624 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4626 0xff, 0x35, /* pushl contents of address */
4627 0, 0, 0, 0, /* replaced with address of .got + 4. */
4628 0x8b, 0x0d, /* movl contents of address, %ecx */
4629 0, 0, 0, 0, /* replaced with address of .got + 8. */
4630 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4631 0xff, 0xe1 /* jmp *%ecx */
4634 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4636 0x8b, 0x0d, /* movl contents of address, %ecx */
4637 0, 0, 0, 0, /* replaced with GOT slot address. */
4638 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4639 0xff, 0xe1, /* jmp *%ecx */
4641 /* Pad to the next 32-byte boundary with nop instructions. */
4643 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4644 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4646 /* Lazy GOT entries point here (32-byte aligned). */
4647 0x68, /* pushl immediate */
4648 0, 0, 0, 0, /* replaced with reloc offset. */
4649 0xe9, /* jmp relative */
4650 0, 0, 0, 0, /* replaced with offset to .plt. */
4652 /* Pad to the next 32-byte boundary with nop instructions. */
4653 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4654 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4658 static const bfd_byte
4659 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4661 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4662 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4663 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4664 0xff, 0xe1, /* jmp *%ecx */
4666 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4667 so pad to that size with nop instructions. */
4668 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4671 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4673 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4674 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4675 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4676 0xff, 0xe1, /* jmp *%ecx */
4678 /* Pad to the next 32-byte boundary with nop instructions. */
4680 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4681 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4683 /* Lazy GOT entries point here (32-byte aligned). */
4684 0x68, /* pushl immediate */
4685 0, 0, 0, 0, /* replaced with offset into relocation table. */
4686 0xe9, /* jmp relative */
4687 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4689 /* Pad to the next 32-byte boundary with nop instructions. */
4690 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4691 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4695 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4697 #if (PLT_CIE_LENGTH != 20 \
4698 || PLT_FDE_LENGTH != 36 \
4699 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4700 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4701 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4703 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4704 0, 0, 0, 0, /* CIE ID */
4705 1, /* CIE version */
4706 'z', 'R', 0, /* Augmentation string */
4707 1, /* Code alignment factor */
4708 0x7c, /* Data alignment factor: -4 */
4709 8, /* Return address column */
4710 1, /* Augmentation size */
4711 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4712 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4713 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4714 DW_CFA_nop, DW_CFA_nop,
4716 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4717 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4718 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4719 0, 0, 0, 0, /* .plt size goes here */
4720 0, /* Augmentation size */
4721 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4722 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4723 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4724 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4725 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4726 13, /* Block length */
4727 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4728 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4729 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4730 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4731 DW_CFA_nop, DW_CFA_nop
4734 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4736 elf_i386_nacl_plt0_entry, /* plt0_entry */
4737 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4738 elf_i386_nacl_plt_entry, /* plt_entry */
4739 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4740 NULL, /* plt_tlsdesc_entry */
4741 0, /* plt_tlsdesc_entry_size*/
4742 0, /* plt_tlsdesc_got1_offset */
4743 0, /* plt_tlsdesc_got2_offset */
4744 0, /* plt_tlsdesc_got1_insn_end */
4745 0, /* plt_tlsdesc_got2_insn_end */
4746 2, /* plt0_got1_offset */
4747 8, /* plt0_got2_offset */
4748 0, /* plt0_got2_insn_end */
4749 2, /* plt_got_offset */
4750 33, /* plt_reloc_offset */
4751 38, /* plt_plt_offset */
4752 0, /* plt_got_insn_size */
4753 0, /* plt_plt_insn_end */
4754 32, /* plt_lazy_offset */
4755 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4756 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4757 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4758 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4761 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4767 elf32_i386_nacl_elf_object_p (bfd *abfd)
4769 /* Set the right machine number for a NaCl i386 ELF32 file. */
4770 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4774 #undef elf_backend_arch_data
4775 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4777 #undef elf_backend_object_p
4778 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4779 #undef elf_backend_modify_segment_map
4780 #define elf_backend_modify_segment_map nacl_modify_segment_map
4781 #undef elf_backend_modify_program_headers
4782 #define elf_backend_modify_program_headers nacl_modify_program_headers
4783 #undef elf_backend_final_write_processing
4784 #define elf_backend_final_write_processing nacl_final_write_processing
4786 #include "elf32-target.h"
4788 /* Restore defaults. */
4789 #undef elf_backend_object_p
4790 #undef elf_backend_modify_segment_map
4791 #undef elf_backend_modify_program_headers
4792 #undef elf_backend_final_write_processing
4794 /* VxWorks support. */
4796 #undef TARGET_LITTLE_SYM
4797 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4798 #undef TARGET_LITTLE_NAME
4799 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4801 #undef ELF_MAXPAGESIZE
4802 #define ELF_MAXPAGESIZE 0x1000
4803 #undef elf_backend_plt_alignment
4804 #define elf_backend_plt_alignment 4
4806 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4811 #undef elf_backend_arch_data
4812 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4814 #undef elf_backend_relocs_compatible
4815 #undef elf_backend_add_symbol_hook
4816 #define elf_backend_add_symbol_hook \
4817 elf_vxworks_add_symbol_hook
4818 #undef elf_backend_link_output_symbol_hook
4819 #define elf_backend_link_output_symbol_hook \
4820 elf_vxworks_link_output_symbol_hook
4821 #undef elf_backend_emit_relocs
4822 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4823 #undef elf_backend_final_write_processing
4824 #define elf_backend_final_write_processing \
4825 elf_vxworks_final_write_processing
4826 #undef elf_backend_static_tls_alignment
4828 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4830 #undef elf_backend_want_plt_sym
4831 #define elf_backend_want_plt_sym 1
4834 #define elf32_bed elf32_i386_vxworks_bed
4836 #include "elf32-target.h"