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 = link_info->call_nop_byte;
1347 if (link_info->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 BFD_ASSERT (h != NULL);
1913 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1922 if (elf_section_data (sec)->this_hdr.contents != contents)
1924 if (!converted && !info->keep_memory)
1928 /* Cache the section contents for elf_link_input_bfd if any
1929 load is converted or --no-keep-memory isn't used. */
1930 elf_section_data (sec)->this_hdr.contents = contents;
1934 /* Cache relocations if any load is converted. */
1935 if (elf_section_data (sec)->relocs != relocs && converted)
1936 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1941 if (elf_section_data (sec)->this_hdr.contents != contents)
1943 sec->check_relocs_failed = 1;
1947 /* Set the correct type for an x86 ELF section. We do this by the
1948 section name, which is a hack, but ought to work. */
1951 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1952 Elf_Internal_Shdr *hdr,
1957 name = bfd_get_section_name (abfd, sec);
1959 /* This is an ugly, but unfortunately necessary hack that is
1960 needed when producing EFI binaries on x86. It tells
1961 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1962 containing ELF relocation info. We need this hack in order to
1963 be able to generate ELF binaries that can be translated into
1964 EFI applications (which are essentially COFF objects). Those
1965 files contain a COFF ".reloc" section inside an ELFNN object,
1966 which would normally cause BFD to segfault because it would
1967 attempt to interpret this section as containing relocation
1968 entries for section "oc". With this hack enabled, ".reloc"
1969 will be treated as a normal data section, which will avoid the
1970 segfault. However, you won't be able to create an ELFNN binary
1971 with a section named "oc" that needs relocations, but that's
1972 the kind of ugly side-effects you get when detecting section
1973 types based on their names... In practice, this limitation is
1974 unlikely to bite. */
1975 if (strcmp (name, ".reloc") == 0)
1976 hdr->sh_type = SHT_PROGBITS;
1981 /* Return the relocation value for @tpoff relocation
1982 if STT_TLS virtual address is ADDRESS. */
1985 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
1987 struct elf_link_hash_table *htab = elf_hash_table (info);
1988 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
1989 bfd_vma static_tls_size;
1991 /* If tls_sec is NULL, we should have signalled an error already. */
1992 if (htab->tls_sec == NULL)
1995 /* Consider special static TLS alignment requirements. */
1996 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
1997 return static_tls_size + htab->tls_sec->vma - address;
2000 /* Relocate an i386 ELF section. */
2003 elf_i386_relocate_section (bfd *output_bfd,
2004 struct bfd_link_info *info,
2006 asection *input_section,
2008 Elf_Internal_Rela *relocs,
2009 Elf_Internal_Sym *local_syms,
2010 asection **local_sections)
2012 struct elf_x86_link_hash_table *htab;
2013 Elf_Internal_Shdr *symtab_hdr;
2014 struct elf_link_hash_entry **sym_hashes;
2015 bfd_vma *local_got_offsets;
2016 bfd_vma *local_tlsdesc_gotents;
2017 Elf_Internal_Rela *rel;
2018 Elf_Internal_Rela *wrel;
2019 Elf_Internal_Rela *relend;
2020 bfd_boolean is_vxworks_tls;
2021 unsigned plt_entry_size;
2023 /* Skip if check_relocs failed. */
2024 if (input_section->check_relocs_failed)
2027 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2031 if (!is_x86_elf (input_bfd, htab))
2033 bfd_set_error (bfd_error_wrong_format);
2037 symtab_hdr = &elf_symtab_hdr (input_bfd);
2038 sym_hashes = elf_sym_hashes (input_bfd);
2039 local_got_offsets = elf_local_got_offsets (input_bfd);
2040 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2041 /* We have to handle relocations in vxworks .tls_vars sections
2042 specially, because the dynamic loader is 'weird'. */
2043 is_vxworks_tls = (htab->target_os == is_vxworks
2044 && bfd_link_pic (info)
2045 && !strcmp (input_section->output_section->name,
2048 _bfd_x86_elf_set_tls_module_base (info);
2050 plt_entry_size = htab->plt.plt_entry_size;
2052 rel = wrel = relocs;
2053 relend = relocs + input_section->reloc_count;
2054 for (; rel < relend; wrel++, rel++)
2056 unsigned int r_type, r_type_tls;
2057 reloc_howto_type *howto;
2058 unsigned long r_symndx;
2059 struct elf_link_hash_entry *h;
2060 struct elf_x86_link_hash_entry *eh;
2061 Elf_Internal_Sym *sym;
2063 bfd_vma off, offplt, plt_offset;
2065 bfd_boolean unresolved_reloc;
2066 bfd_reloc_status_type r;
2070 asection *resolved_plt;
2071 bfd_boolean resolved_to_zero;
2072 bfd_boolean relative_reloc;
2074 r_type = ELF32_R_TYPE (rel->r_info);
2075 if (r_type == R_386_GNU_VTINHERIT
2076 || r_type == R_386_GNU_VTENTRY)
2083 howto = elf_i386_rtype_to_howto (r_type);
2085 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2087 r_symndx = ELF32_R_SYM (rel->r_info);
2091 unresolved_reloc = FALSE;
2092 if (r_symndx < symtab_hdr->sh_info)
2094 sym = local_syms + r_symndx;
2095 sec = local_sections[r_symndx];
2096 relocation = (sec->output_section->vma
2097 + sec->output_offset
2099 st_size = sym->st_size;
2101 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2102 && ((sec->flags & SEC_MERGE) != 0
2103 || (bfd_link_relocatable (info)
2104 && sec->output_offset != 0)))
2107 bfd_byte *where = contents + rel->r_offset;
2109 switch (howto->size)
2112 addend = bfd_get_8 (input_bfd, where);
2113 if (howto->pc_relative)
2115 addend = (addend ^ 0x80) - 0x80;
2120 addend = bfd_get_16 (input_bfd, where);
2121 if (howto->pc_relative)
2123 addend = (addend ^ 0x8000) - 0x8000;
2128 addend = bfd_get_32 (input_bfd, where);
2129 if (howto->pc_relative)
2131 addend = (addend ^ 0x80000000) - 0x80000000;
2139 if (bfd_link_relocatable (info))
2140 addend += sec->output_offset;
2143 asection *msec = sec;
2144 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2146 addend -= relocation;
2147 addend += msec->output_section->vma + msec->output_offset;
2150 switch (howto->size)
2153 /* FIXME: overflow checks. */
2154 if (howto->pc_relative)
2156 bfd_put_8 (input_bfd, addend, where);
2159 if (howto->pc_relative)
2161 bfd_put_16 (input_bfd, addend, where);
2164 if (howto->pc_relative)
2166 bfd_put_32 (input_bfd, addend, where);
2170 else if (!bfd_link_relocatable (info)
2171 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2173 /* Relocate against local STT_GNU_IFUNC symbol. */
2174 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2179 /* Set STT_GNU_IFUNC symbol value. */
2180 h->root.u.def.value = sym->st_value;
2181 h->root.u.def.section = sec;
2186 bfd_boolean warned ATTRIBUTE_UNUSED;
2187 bfd_boolean ignored ATTRIBUTE_UNUSED;
2189 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2190 r_symndx, symtab_hdr, sym_hashes,
2192 unresolved_reloc, warned, ignored);
2196 if (sec != NULL && discarded_section (sec))
2198 _bfd_clear_contents (howto, input_bfd, input_section,
2199 contents, rel->r_offset);
2200 wrel->r_offset = rel->r_offset;
2204 /* For ld -r, remove relocations in debug sections against
2205 sections defined in discarded sections. Not done for
2206 eh_frame editing code expects to be present. */
2207 if (bfd_link_relocatable (info)
2208 && (input_section->flags & SEC_DEBUGGING))
2214 if (bfd_link_relocatable (info))
2221 eh = (struct elf_x86_link_hash_entry *) h;
2223 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2224 it here if it is defined in a non-shared object. */
2226 && h->type == STT_GNU_IFUNC
2229 asection *gotplt, *base_got;
2233 if ((input_section->flags & SEC_ALLOC) == 0)
2235 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2236 STT_GNU_IFUNC symbol as STT_FUNC. */
2237 if (elf_section_type (input_section) == SHT_NOTE)
2239 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2240 sections because such sections are not SEC_ALLOC and
2241 thus ld.so will not process them. */
2242 if ((input_section->flags & SEC_DEBUGGING) != 0)
2247 /* STT_GNU_IFUNC symbol must go through PLT. */
2248 if (htab->elf.splt != NULL)
2250 if (htab->plt_second != NULL)
2252 resolved_plt = htab->plt_second;
2253 plt_offset = eh->plt_second.offset;
2257 resolved_plt = htab->elf.splt;
2258 plt_offset = h->plt.offset;
2260 gotplt = htab->elf.sgotplt;
2264 resolved_plt = htab->elf.iplt;
2265 plt_offset = h->plt.offset;
2266 gotplt = htab->elf.igotplt;
2276 base_got = htab->elf.sgot;
2277 off = h->got.offset;
2279 if (base_got == NULL)
2282 if (off == (bfd_vma) -1)
2284 /* We can't use h->got.offset here to save state, or
2285 even just remember the offset, as finish_dynamic_symbol
2286 would use that as offset into .got. */
2288 if (h->plt.offset == (bfd_vma) -1)
2291 if (htab->elf.splt != NULL)
2293 plt_index = (h->plt.offset / plt_entry_size
2294 - htab->plt.has_plt0);
2295 off = (plt_index + 3) * 4;
2296 base_got = htab->elf.sgotplt;
2300 plt_index = h->plt.offset / plt_entry_size;
2301 off = plt_index * 4;
2302 base_got = htab->elf.igotplt;
2305 if (h->dynindx == -1
2309 /* This references the local defitionion. We must
2310 initialize this entry in the global offset table.
2311 Since the offset must always be a multiple of 8,
2312 we use the least significant bit to record
2313 whether we have initialized it already.
2315 When doing a dynamic link, we create a .rela.got
2316 relocation entry to initialize the value. This
2317 is done in the finish_dynamic_symbol routine. */
2322 bfd_put_32 (output_bfd, relocation,
2323 base_got->contents + off);
2331 relocation = (base_got->output_section->vma
2332 + base_got->output_offset + off
2333 - gotplt->output_section->vma
2334 - gotplt->output_offset);
2336 if (rel->r_offset > 1
2337 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2338 && *(contents + rel->r_offset - 2) != 0x8d)
2340 if (bfd_link_pic (info))
2341 goto disallow_got32;
2343 /* Add the GOT base if there is no base register. */
2344 relocation += (gotplt->output_section->vma
2345 + gotplt->output_offset);
2347 else if (htab->elf.splt == NULL)
2349 /* Adjust for static executables. */
2350 relocation += gotplt->output_offset;
2356 if (h->plt.offset == (bfd_vma) -1)
2358 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2359 if (r_type == R_386_32
2360 && (input_section->flags & SEC_CODE) == 0)
2361 goto do_ifunc_pointer;
2362 goto bad_ifunc_reloc;
2365 relocation = (resolved_plt->output_section->vma
2366 + resolved_plt->output_offset + plt_offset);
2372 if (h->root.root.string)
2373 name = h->root.root.string;
2375 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2378 /* xgettext:c-format */
2379 (_("%pB: relocation %s against STT_GNU_IFUNC "
2380 "symbol `%s' isn't supported"), input_bfd,
2382 bfd_set_error (bfd_error_bad_value);
2386 /* Generate dynamic relcoation only when there is a
2387 non-GOT reference in a shared object. */
2388 if ((bfd_link_pic (info) && h->non_got_ref)
2389 || h->plt.offset == (bfd_vma) -1)
2391 Elf_Internal_Rela outrel;
2396 /* Need a dynamic relocation to get the real function
2398 offset = _bfd_elf_section_offset (output_bfd,
2402 if (offset == (bfd_vma) -1
2403 || offset == (bfd_vma) -2)
2406 outrel.r_offset = (input_section->output_section->vma
2407 + input_section->output_offset
2410 if (POINTER_LOCAL_IFUNC_P (info, h))
2412 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
2413 h->root.root.string,
2414 h->root.u.def.section->owner);
2416 /* This symbol is resolved locally. */
2417 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2418 bfd_put_32 (output_bfd,
2419 (h->root.u.def.value
2420 + h->root.u.def.section->output_section->vma
2421 + h->root.u.def.section->output_offset),
2425 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2427 /* Dynamic relocations are stored in
2428 1. .rel.ifunc section in PIC object.
2429 2. .rel.got section in dynamic executable.
2430 3. .rel.iplt section in static executable. */
2431 if (bfd_link_pic (info))
2432 sreloc = htab->elf.irelifunc;
2433 else if (htab->elf.splt != NULL)
2434 sreloc = htab->elf.srelgot;
2436 sreloc = htab->elf.irelplt;
2437 elf_append_rel (output_bfd, sreloc, &outrel);
2439 /* If this reloc is against an external symbol, we
2440 do not want to fiddle with the addend. Otherwise,
2441 we need to include the symbol value so that it
2442 becomes an addend for the dynamic reloc. For an
2443 internal symbol, we have updated addend. */
2452 relocation -= (gotplt->output_section->vma
2453 + gotplt->output_offset);
2459 resolved_to_zero = (eh != NULL
2460 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2466 /* Relocation is to the entry for this symbol in the global
2468 if (htab->elf.sgot == NULL)
2471 relative_reloc = FALSE;
2474 off = h->got.offset;
2475 if (RESOLVED_LOCALLY_P (info, h, htab))
2477 /* We must initialize this entry in the global offset
2478 table. Since the offset must always be a multiple
2479 of 4, we use the least significant bit to record
2480 whether we have initialized it already.
2482 When doing a dynamic link, we create a .rel.got
2483 relocation entry to initialize the value. This
2484 is done in the finish_dynamic_symbol routine. */
2489 bfd_put_32 (output_bfd, relocation,
2490 htab->elf.sgot->contents + off);
2493 if (GENERATE_RELATIVE_RELOC_P (info, h))
2495 /* PR ld/21402: If this symbol isn't dynamic
2496 in PIC, generate R_386_RELATIVE here. */
2497 eh->no_finish_dynamic_symbol = 1;
2498 relative_reloc = TRUE;
2503 unresolved_reloc = FALSE;
2507 if (local_got_offsets == NULL)
2510 off = local_got_offsets[r_symndx];
2512 /* The offset must always be a multiple of 4. We use
2513 the least significant bit to record whether we have
2514 already generated the necessary reloc. */
2519 bfd_put_32 (output_bfd, relocation,
2520 htab->elf.sgot->contents + off);
2521 local_got_offsets[r_symndx] |= 1;
2523 if (bfd_link_pic (info))
2524 relative_reloc = TRUE;
2531 Elf_Internal_Rela outrel;
2533 s = htab->elf.srelgot;
2537 outrel.r_offset = (htab->elf.sgot->output_section->vma
2538 + htab->elf.sgot->output_offset
2540 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2541 elf_append_rel (output_bfd, s, &outrel);
2544 if (off >= (bfd_vma) -2)
2547 relocation = (htab->elf.sgot->output_section->vma
2548 + htab->elf.sgot->output_offset + off);
2549 if (rel->r_offset > 1
2550 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2551 && *(contents + rel->r_offset - 2) != 0x8d)
2553 if (bfd_link_pic (info))
2555 /* For PIC, disallow R_386_GOT32 without a base
2556 register, except for "lea foo@GOT, %reg", since
2557 we don't know what the GOT base is. */
2561 if (h == NULL || h->root.root.string == NULL)
2562 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2565 name = h->root.root.string;
2568 /* xgettext:c-format */
2569 (_("%pB: direct GOT relocation %s against `%s'"
2570 " without base register can not be used"
2571 " when making a shared object"),
2572 input_bfd, howto->name, name);
2573 bfd_set_error (bfd_error_bad_value);
2579 /* Subtract the .got.plt section address only with a base
2581 relocation -= (htab->elf.sgotplt->output_section->vma
2582 + htab->elf.sgotplt->output_offset);
2588 /* Relocation is relative to the start of the global offset
2591 /* Check to make sure it isn't a protected function or data
2592 symbol for shared library since it may not be local when
2593 used as function address or with copy relocation. We also
2594 need to make sure that a symbol is referenced locally. */
2595 if (!bfd_link_executable (info) && h)
2597 if (!h->def_regular)
2601 switch (ELF_ST_VISIBILITY (h->other))
2604 v = _("hidden symbol");
2607 v = _("internal symbol");
2610 v = _("protected symbol");
2618 /* xgettext:c-format */
2619 (_("%pB: relocation R_386_GOTOFF against undefined %s"
2620 " `%s' can not be used when making a shared object"),
2621 input_bfd, v, h->root.root.string);
2622 bfd_set_error (bfd_error_bad_value);
2625 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2626 && (h->type == STT_FUNC
2627 || h->type == STT_OBJECT)
2628 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2631 /* xgettext:c-format */
2632 (_("%pB: relocation R_386_GOTOFF against protected %s"
2633 " `%s' can not be used when making a shared object"),
2635 h->type == STT_FUNC ? "function" : "data",
2636 h->root.root.string);
2637 bfd_set_error (bfd_error_bad_value);
2642 /* Note that sgot is not involved in this
2643 calculation. We always want the start of .got.plt. If we
2644 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2645 permitted by the ABI, we might have to change this
2647 relocation -= htab->elf.sgotplt->output_section->vma
2648 + htab->elf.sgotplt->output_offset;
2652 /* Use global offset table as symbol value. */
2653 relocation = htab->elf.sgotplt->output_section->vma
2654 + htab->elf.sgotplt->output_offset;
2655 unresolved_reloc = FALSE;
2659 /* Relocation is to the entry for this symbol in the
2660 procedure linkage table. */
2662 /* Resolve a PLT32 reloc against a local symbol directly,
2663 without using the procedure linkage table. */
2667 if ((h->plt.offset == (bfd_vma) -1
2668 && eh->plt_got.offset == (bfd_vma) -1)
2669 || htab->elf.splt == NULL)
2671 /* We didn't make a PLT entry for this symbol. This
2672 happens when statically linking PIC code, or when
2673 using -Bsymbolic. */
2677 if (h->plt.offset != (bfd_vma) -1)
2679 if (htab->plt_second != NULL)
2681 resolved_plt = htab->plt_second;
2682 plt_offset = eh->plt_second.offset;
2686 resolved_plt = htab->elf.splt;
2687 plt_offset = h->plt.offset;
2692 resolved_plt = htab->plt_got;
2693 plt_offset = eh->plt_got.offset;
2696 relocation = (resolved_plt->output_section->vma
2697 + resolved_plt->output_offset
2699 unresolved_reloc = FALSE;
2703 /* Set to symbol size. */
2704 relocation = st_size;
2709 if ((input_section->flags & SEC_ALLOC) == 0
2713 if (GENERATE_DYNAMIC_RELOCATION_P (info, eh, r_type,
2714 FALSE, resolved_to_zero,
2715 (r_type == R_386_PC32)))
2717 Elf_Internal_Rela outrel;
2718 bfd_boolean skip, relocate;
2721 /* When generating a shared object, these relocations
2722 are copied into the output file to be resolved at run
2729 _bfd_elf_section_offset (output_bfd, info, input_section,
2731 if (outrel.r_offset == (bfd_vma) -1)
2733 else if (outrel.r_offset == (bfd_vma) -2)
2734 skip = TRUE, relocate = TRUE;
2735 outrel.r_offset += (input_section->output_section->vma
2736 + input_section->output_offset);
2739 memset (&outrel, 0, sizeof outrel);
2740 else if (COPY_INPUT_RELOC_P (info, h, r_type))
2741 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2744 /* This symbol is local, or marked to become local. */
2746 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2749 sreloc = elf_section_data (input_section)->sreloc;
2751 if (sreloc == NULL || sreloc->contents == NULL)
2753 r = bfd_reloc_notsupported;
2754 goto check_relocation_error;
2757 elf_append_rel (output_bfd, sreloc, &outrel);
2759 /* If this reloc is against an external symbol, we do
2760 not want to fiddle with the addend. Otherwise, we
2761 need to include the symbol value so that it becomes
2762 an addend for the dynamic reloc. */
2769 if (!bfd_link_executable (info))
2771 Elf_Internal_Rela outrel;
2774 outrel.r_offset = rel->r_offset
2775 + input_section->output_section->vma
2776 + input_section->output_offset;
2777 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2778 sreloc = elf_section_data (input_section)->sreloc;
2781 elf_append_rel (output_bfd, sreloc, &outrel);
2786 case R_386_TLS_GOTDESC:
2787 case R_386_TLS_DESC_CALL:
2788 case R_386_TLS_IE_32:
2789 case R_386_TLS_GOTIE:
2790 tls_type = GOT_UNKNOWN;
2791 if (h == NULL && local_got_offsets)
2792 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2794 tls_type = elf_x86_hash_entry(h)->tls_type;
2795 if (tls_type == GOT_TLS_IE)
2796 tls_type = GOT_TLS_IE_NEG;
2798 r_type_tls = r_type;
2799 if (! elf_i386_tls_transition (info, input_bfd,
2800 input_section, contents,
2801 symtab_hdr, sym_hashes,
2802 &r_type_tls, tls_type, rel,
2803 relend, h, r_symndx, TRUE))
2806 if (r_type_tls == R_386_TLS_LE_32)
2808 BFD_ASSERT (! unresolved_reloc);
2809 if (r_type == R_386_TLS_GD)
2814 /* GD->LE transition. */
2815 type = *(contents + rel->r_offset - 2);
2819 leal foo@tlsgd(,%ebx,1), %eax
2820 call ___tls_get_addr@PLT
2823 subl $foo@tpoff, %eax
2824 (6 byte form of subl). */
2825 roff = rel->r_offset + 5;
2830 leal foo@tlsgd(%ebx), %eax
2831 call ___tls_get_addr@PLT
2834 leal foo@tlsgd(%reg), %eax
2835 call *___tls_get_addr@GOT(%reg)
2836 which may be converted to
2837 addr32 call ___tls_get_addr
2839 movl %gs:0, %eax; subl $foo@tpoff, %eax
2840 (6 byte form of subl). */
2841 roff = rel->r_offset + 6;
2843 memcpy (contents + roff - 8,
2844 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2845 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2847 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2852 else if (r_type == R_386_TLS_GOTDESC)
2854 /* GDesc -> LE transition.
2855 It's originally something like:
2856 leal x@tlsdesc(%ebx), %eax
2860 Registers other than %eax may be set up here. */
2865 roff = rel->r_offset;
2866 val = bfd_get_8 (input_bfd, contents + roff - 1);
2868 /* Now modify the instruction as appropriate. */
2869 /* aoliva FIXME: remove the above and xor the byte
2871 bfd_put_8 (output_bfd, val ^ 0x86,
2872 contents + roff - 1);
2873 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2877 else if (r_type == R_386_TLS_DESC_CALL)
2879 /* GDesc -> LE transition.
2887 roff = rel->r_offset;
2888 bfd_put_8 (output_bfd, 0x66, contents + roff);
2889 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
2892 else if (r_type == R_386_TLS_IE)
2896 /* IE->LE transition:
2897 Originally it can be one of:
2905 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2908 /* movl foo, %eax. */
2909 bfd_put_8 (output_bfd, 0xb8,
2910 contents + rel->r_offset - 1);
2916 type = bfd_get_8 (input_bfd,
2917 contents + rel->r_offset - 2);
2922 bfd_put_8 (output_bfd, 0xc7,
2923 contents + rel->r_offset - 2);
2924 bfd_put_8 (output_bfd,
2925 0xc0 | ((val >> 3) & 7),
2926 contents + rel->r_offset - 1);
2930 bfd_put_8 (output_bfd, 0x81,
2931 contents + rel->r_offset - 2);
2932 bfd_put_8 (output_bfd,
2933 0xc0 | ((val >> 3) & 7),
2934 contents + rel->r_offset - 1);
2941 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2942 contents + rel->r_offset);
2947 unsigned int val, type;
2949 /* {IE_32,GOTIE}->LE transition:
2950 Originally it can be one of:
2951 subl foo(%reg1), %reg2
2952 movl foo(%reg1), %reg2
2953 addl foo(%reg1), %reg2
2956 movl $foo, %reg2 (6 byte form)
2957 addl $foo, %reg2. */
2958 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2959 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2963 bfd_put_8 (output_bfd, 0xc7,
2964 contents + rel->r_offset - 2);
2965 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2966 contents + rel->r_offset - 1);
2968 else if (type == 0x2b)
2971 bfd_put_8 (output_bfd, 0x81,
2972 contents + rel->r_offset - 2);
2973 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
2974 contents + rel->r_offset - 1);
2976 else if (type == 0x03)
2979 bfd_put_8 (output_bfd, 0x81,
2980 contents + rel->r_offset - 2);
2981 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
2982 contents + rel->r_offset - 1);
2986 if (r_type == R_386_TLS_GOTIE)
2987 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2988 contents + rel->r_offset);
2990 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2991 contents + rel->r_offset);
2996 if (htab->elf.sgot == NULL)
3001 off = h->got.offset;
3002 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3006 if (local_got_offsets == NULL)
3009 off = local_got_offsets[r_symndx];
3010 offplt = local_tlsdesc_gotents[r_symndx];
3017 Elf_Internal_Rela outrel;
3021 if (htab->elf.srelgot == NULL)
3024 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3026 if (GOT_TLS_GDESC_P (tls_type))
3029 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3030 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3031 <= htab->elf.sgotplt->size);
3032 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3033 + htab->elf.sgotplt->output_offset
3035 + htab->sgotplt_jump_table_size);
3036 sreloc = htab->elf.srelplt;
3037 loc = sreloc->contents;
3038 loc += (htab->next_tls_desc_index++
3039 * sizeof (Elf32_External_Rel));
3040 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3041 <= sreloc->contents + sreloc->size);
3042 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3045 BFD_ASSERT (! unresolved_reloc);
3046 bfd_put_32 (output_bfd,
3047 relocation - _bfd_x86_elf_dtpoff_base (info),
3048 htab->elf.sgotplt->contents + offplt
3049 + htab->sgotplt_jump_table_size + 4);
3053 bfd_put_32 (output_bfd, 0,
3054 htab->elf.sgotplt->contents + offplt
3055 + htab->sgotplt_jump_table_size + 4);
3059 sreloc = htab->elf.srelgot;
3061 outrel.r_offset = (htab->elf.sgot->output_section->vma
3062 + htab->elf.sgot->output_offset + off);
3064 if (GOT_TLS_GD_P (tls_type))
3065 dr_type = R_386_TLS_DTPMOD32;
3066 else if (GOT_TLS_GDESC_P (tls_type))
3068 else if (tls_type == GOT_TLS_IE_POS)
3069 dr_type = R_386_TLS_TPOFF;
3071 dr_type = R_386_TLS_TPOFF32;
3073 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3074 bfd_put_32 (output_bfd,
3075 relocation - _bfd_x86_elf_dtpoff_base (info),
3076 htab->elf.sgot->contents + off);
3077 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3078 bfd_put_32 (output_bfd,
3079 _bfd_x86_elf_dtpoff_base (info) - relocation,
3080 htab->elf.sgot->contents + off);
3081 else if (dr_type != R_386_TLS_DESC)
3082 bfd_put_32 (output_bfd, 0,
3083 htab->elf.sgot->contents + off);
3084 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3086 elf_append_rel (output_bfd, sreloc, &outrel);
3088 if (GOT_TLS_GD_P (tls_type))
3092 BFD_ASSERT (! unresolved_reloc);
3093 bfd_put_32 (output_bfd,
3094 relocation - _bfd_x86_elf_dtpoff_base (info),
3095 htab->elf.sgot->contents + off + 4);
3099 bfd_put_32 (output_bfd, 0,
3100 htab->elf.sgot->contents + off + 4);
3101 outrel.r_info = ELF32_R_INFO (indx,
3102 R_386_TLS_DTPOFF32);
3103 outrel.r_offset += 4;
3104 elf_append_rel (output_bfd, sreloc, &outrel);
3107 else if (tls_type == GOT_TLS_IE_BOTH)
3109 bfd_put_32 (output_bfd,
3111 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3113 htab->elf.sgot->contents + off + 4);
3114 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3115 outrel.r_offset += 4;
3116 elf_append_rel (output_bfd, sreloc, &outrel);
3123 local_got_offsets[r_symndx] |= 1;
3126 if (off >= (bfd_vma) -2
3127 && ! GOT_TLS_GDESC_P (tls_type))
3129 if (r_type_tls == R_386_TLS_GOTDESC
3130 || r_type_tls == R_386_TLS_DESC_CALL)
3132 relocation = htab->sgotplt_jump_table_size + offplt;
3133 unresolved_reloc = FALSE;
3135 else if (r_type_tls == r_type)
3137 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3138 + htab->elf.sgotplt->output_offset;
3139 relocation = htab->elf.sgot->output_section->vma
3140 + htab->elf.sgot->output_offset + off - g_o_t;
3141 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3142 && tls_type == GOT_TLS_IE_BOTH)
3144 if (r_type == R_386_TLS_IE)
3145 relocation += g_o_t;
3146 unresolved_reloc = FALSE;
3148 else if (r_type == R_386_TLS_GD)
3150 unsigned int val, type;
3153 /* GD->IE transition. */
3154 type = *(contents + rel->r_offset - 2);
3155 val = *(contents + rel->r_offset - 1);
3159 leal foo@tlsgd(,%ebx,1), %eax
3160 call ___tls_get_addr@PLT
3163 subl $foo@gottpoff(%ebx), %eax. */
3165 roff = rel->r_offset - 3;
3170 leal foo@tlsgd(%ebx), %eax
3171 call ___tls_get_addr@PLT
3174 leal foo@tlsgd(%reg), %eax
3175 call *___tls_get_addr@GOT(%reg)
3176 which may be converted to
3177 addr32 call ___tls_get_addr
3180 subl $foo@gottpoff(%reg), %eax. */
3181 roff = rel->r_offset - 2;
3183 memcpy (contents + roff,
3184 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3185 contents[roff + 7] = 0x80 | (val & 7);
3186 /* If foo is used only with foo@gotntpoff(%reg) and
3187 foo@indntpoff, but not with foo@gottpoff(%reg), change
3188 subl $foo@gottpoff(%reg), %eax
3190 addl $foo@gotntpoff(%reg), %eax. */
3191 if (tls_type == GOT_TLS_IE_POS)
3192 contents[roff + 6] = 0x03;
3193 bfd_put_32 (output_bfd,
3194 htab->elf.sgot->output_section->vma
3195 + htab->elf.sgot->output_offset + off
3196 - htab->elf.sgotplt->output_section->vma
3197 - htab->elf.sgotplt->output_offset,
3198 contents + roff + 8);
3199 /* Skip R_386_PLT32 and R_386_GOT32X. */
3204 else if (r_type == R_386_TLS_GOTDESC)
3206 /* GDesc -> IE transition.
3207 It's originally something like:
3208 leal x@tlsdesc(%ebx), %eax
3211 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3213 movl x@gottpoff(%ebx), %eax # before negl %eax
3215 Registers other than %eax may be set up here. */
3219 /* First, make sure it's a leal adding ebx to a 32-bit
3220 offset into any register, although it's probably
3221 almost always going to be eax. */
3222 roff = rel->r_offset;
3224 /* Now modify the instruction as appropriate. */
3225 /* To turn a leal into a movl in the form we use it, it
3226 suffices to change the first byte from 0x8d to 0x8b.
3227 aoliva FIXME: should we decide to keep the leal, all
3228 we have to do is remove the statement below, and
3229 adjust the relaxation of R_386_TLS_DESC_CALL. */
3230 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3232 if (tls_type == GOT_TLS_IE_BOTH)
3235 bfd_put_32 (output_bfd,
3236 htab->elf.sgot->output_section->vma
3237 + htab->elf.sgot->output_offset + off
3238 - htab->elf.sgotplt->output_section->vma
3239 - htab->elf.sgotplt->output_offset,
3243 else if (r_type == R_386_TLS_DESC_CALL)
3245 /* GDesc -> IE transition.
3253 depending on how we transformed the TLS_GOTDESC above.
3258 roff = rel->r_offset;
3260 /* Now modify the instruction as appropriate. */
3261 if (tls_type != GOT_TLS_IE_NEG)
3264 bfd_put_8 (output_bfd, 0x66, contents + roff);
3265 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3270 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3271 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3281 if (! elf_i386_tls_transition (info, input_bfd,
3282 input_section, contents,
3283 symtab_hdr, sym_hashes,
3284 &r_type, GOT_UNKNOWN, rel,
3285 relend, h, r_symndx, TRUE))
3288 if (r_type != R_386_TLS_LDM)
3290 /* LD->LE transition. Change
3291 leal foo@tlsldm(%ebx) %eax
3292 call ___tls_get_addr@PLT
3296 leal 0(%esi,1), %esi
3298 leal foo@tlsldm(%reg) %eax
3299 call *___tls_get_addr@GOT(%reg)
3300 which may be converted to
3301 addr32 call ___tls_get_addr
3304 leal 0(%esi), %esi */
3305 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3306 if (*(contents + rel->r_offset + 4) == 0xff
3307 || *(contents + rel->r_offset + 4) == 0x67)
3308 memcpy (contents + rel->r_offset - 2,
3309 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3311 memcpy (contents + rel->r_offset - 2,
3312 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3313 /* Skip R_386_PC32/R_386_PLT32. */
3319 if (htab->elf.sgot == NULL)
3322 off = htab->tls_ld_or_ldm_got.offset;
3327 Elf_Internal_Rela outrel;
3329 if (htab->elf.srelgot == NULL)
3332 outrel.r_offset = (htab->elf.sgot->output_section->vma
3333 + htab->elf.sgot->output_offset + off);
3335 bfd_put_32 (output_bfd, 0,
3336 htab->elf.sgot->contents + off);
3337 bfd_put_32 (output_bfd, 0,
3338 htab->elf.sgot->contents + off + 4);
3339 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3340 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3341 htab->tls_ld_or_ldm_got.offset |= 1;
3343 relocation = htab->elf.sgot->output_section->vma
3344 + htab->elf.sgot->output_offset + off
3345 - htab->elf.sgotplt->output_section->vma
3346 - htab->elf.sgotplt->output_offset;
3347 unresolved_reloc = FALSE;
3350 case R_386_TLS_LDO_32:
3351 if (!bfd_link_executable (info)
3352 || (input_section->flags & SEC_CODE) == 0)
3353 relocation -= _bfd_x86_elf_dtpoff_base (info);
3355 /* When converting LDO to LE, we must negate. */
3356 relocation = -elf_i386_tpoff (info, relocation);
3359 case R_386_TLS_LE_32:
3361 if (!bfd_link_executable (info))
3363 Elf_Internal_Rela outrel;
3366 outrel.r_offset = rel->r_offset
3367 + input_section->output_section->vma
3368 + input_section->output_offset;
3369 if (h != NULL && h->dynindx != -1)
3373 if (r_type == R_386_TLS_LE_32)
3374 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3376 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3377 sreloc = elf_section_data (input_section)->sreloc;
3380 elf_append_rel (output_bfd, sreloc, &outrel);
3383 else if (r_type == R_386_TLS_LE_32)
3384 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3386 relocation -= _bfd_x86_elf_dtpoff_base (info);
3388 else if (r_type == R_386_TLS_LE_32)
3389 relocation = elf_i386_tpoff (info, relocation);
3391 relocation = -elf_i386_tpoff (info, relocation);
3398 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3399 because such sections are not SEC_ALLOC and thus ld.so will
3400 not process them. */
3401 if (unresolved_reloc
3402 && !((input_section->flags & SEC_DEBUGGING) != 0
3404 && _bfd_elf_section_offset (output_bfd, info, input_section,
3405 rel->r_offset) != (bfd_vma) -1)
3408 /* xgettext:c-format */
3409 (_("%pB(%pA+%#" PRIx64 "): unresolvable %s relocation against symbol `%s'"),
3412 (uint64_t) rel->r_offset,
3414 h->root.root.string);
3419 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3420 contents, rel->r_offset,
3423 check_relocation_error:
3424 if (r != bfd_reloc_ok)
3429 name = h->root.root.string;
3432 name = bfd_elf_string_from_elf_section (input_bfd,
3433 symtab_hdr->sh_link,
3438 name = bfd_section_name (input_bfd, sec);
3441 if (r == bfd_reloc_overflow)
3442 (*info->callbacks->reloc_overflow)
3443 (info, (h ? &h->root : NULL), name, howto->name,
3444 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3448 /* xgettext:c-format */
3449 (_("%pB(%pA+%#" PRIx64 "): reloc against `%s': error %d"),
3450 input_bfd, input_section,
3451 (uint64_t) rel->r_offset, name, (int) r);
3462 Elf_Internal_Shdr *rel_hdr;
3463 size_t deleted = rel - wrel;
3465 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3466 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3467 if (rel_hdr->sh_size == 0)
3469 /* It is too late to remove an empty reloc section. Leave
3471 ??? What is wrong with an empty section??? */
3472 rel_hdr->sh_size = rel_hdr->sh_entsize;
3475 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3476 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3477 input_section->reloc_count -= deleted;
3483 /* Finish up dynamic symbol handling. We set the contents of various
3484 dynamic sections here. */
3487 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3488 struct bfd_link_info *info,
3489 struct elf_link_hash_entry *h,
3490 Elf_Internal_Sym *sym)
3492 struct elf_x86_link_hash_table *htab;
3493 unsigned plt_entry_size;
3494 struct elf_x86_link_hash_entry *eh;
3495 bfd_boolean local_undefweak;
3496 bfd_boolean use_plt_second;
3498 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3502 plt_entry_size = htab->plt.plt_entry_size;
3504 /* Use the second PLT section only if there is .plt section. */
3505 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3507 eh = (struct elf_x86_link_hash_entry *) h;
3508 if (eh->no_finish_dynamic_symbol)
3511 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3512 resolved undefined weak symbols in executable so that their
3513 references have value 0 at run-time. */
3514 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3516 if (h->plt.offset != (bfd_vma) -1)
3518 bfd_vma plt_index, plt_offset;
3520 Elf_Internal_Rela rel;
3522 asection *plt, *resolved_plt, *gotplt, *relplt;
3524 /* When building a static executable, use .iplt, .igot.plt and
3525 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3526 if (htab->elf.splt != NULL)
3528 plt = htab->elf.splt;
3529 gotplt = htab->elf.sgotplt;
3530 relplt = htab->elf.srelplt;
3534 plt = htab->elf.iplt;
3535 gotplt = htab->elf.igotplt;
3536 relplt = htab->elf.irelplt;
3539 VERIFY_PLT_ENTRY (info, h, plt, gotplt, relplt, local_undefweak)
3541 /* Get the index in the procedure linkage table which
3542 corresponds to this symbol. This is the index of this symbol
3543 in all the symbols for which we are making plt entries. The
3544 first entry in the procedure linkage table is reserved.
3546 Get the offset into the .got table of the entry that
3547 corresponds to this function. Each .got entry is 4 bytes.
3548 The first three are reserved.
3550 For static executables, we don't reserve anything. */
3552 if (plt == htab->elf.splt)
3554 got_offset = (h->plt.offset / plt_entry_size
3555 - htab->plt.has_plt0);
3556 got_offset = (got_offset + 3) * 4;
3560 got_offset = h->plt.offset / plt_entry_size;
3561 got_offset = got_offset * 4;
3564 /* Fill in the entry in the procedure linkage table and update
3566 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3571 const bfd_byte *plt_entry;
3572 if (bfd_link_pic (info))
3573 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3575 plt_entry = htab->non_lazy_plt->plt_entry;
3576 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3577 plt_entry, htab->non_lazy_plt->plt_entry_size);
3579 resolved_plt = htab->plt_second;
3580 plt_offset = eh->plt_second.offset;
3585 plt_offset = h->plt.offset;
3588 if (! bfd_link_pic (info))
3590 bfd_put_32 (output_bfd,
3591 (gotplt->output_section->vma
3592 + gotplt->output_offset
3594 resolved_plt->contents + plt_offset
3595 + htab->plt.plt_got_offset);
3597 if (htab->target_os == is_vxworks)
3599 int s, k, reloc_index;
3601 /* Create the R_386_32 relocation referencing the GOT
3602 for this PLT entry. */
3604 /* S: Current slot number (zero-based). */
3605 s = ((h->plt.offset - htab->plt.plt_entry_size)
3606 / htab->plt.plt_entry_size);
3607 /* K: Number of relocations for PLTResolve. */
3608 if (bfd_link_pic (info))
3609 k = PLTRESOLVE_RELOCS_SHLIB;
3611 k = PLTRESOLVE_RELOCS;
3612 /* Skip the PLTresolve relocations, and the relocations for
3613 the other PLT slots. */
3614 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3615 loc = (htab->srelplt2->contents + reloc_index
3616 * sizeof (Elf32_External_Rel));
3618 rel.r_offset = (plt->output_section->vma
3619 + plt->output_offset
3620 + h->plt.offset + 2),
3621 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3622 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3624 /* Create the R_386_32 relocation referencing the beginning of
3625 the PLT for this GOT entry. */
3626 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3627 + htab->elf.sgotplt->output_offset
3629 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3630 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3631 loc + sizeof (Elf32_External_Rel));
3636 bfd_put_32 (output_bfd, got_offset,
3637 resolved_plt->contents + plt_offset
3638 + htab->plt.plt_got_offset);
3641 /* Fill in the entry in the global offset table. Leave the entry
3642 as zero for undefined weak symbol in PIE. No PLT relocation
3643 against undefined weak symbol in PIE. */
3644 if (!local_undefweak)
3646 if (htab->plt.has_plt0)
3647 bfd_put_32 (output_bfd,
3648 (plt->output_section->vma
3649 + plt->output_offset
3651 + htab->lazy_plt->plt_lazy_offset),
3652 gotplt->contents + got_offset);
3654 /* Fill in the entry in the .rel.plt section. */
3655 rel.r_offset = (gotplt->output_section->vma
3656 + gotplt->output_offset
3658 if (PLT_LOCAL_IFUNC_P (info, h))
3660 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3661 h->root.root.string,
3662 h->root.u.def.section->owner);
3664 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3665 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3666 in the .got.plt section. */
3667 bfd_put_32 (output_bfd,
3668 (h->root.u.def.value
3669 + h->root.u.def.section->output_section->vma
3670 + h->root.u.def.section->output_offset),
3671 gotplt->contents + got_offset);
3672 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3673 /* R_386_IRELATIVE comes last. */
3674 plt_index = htab->next_irelative_index--;
3678 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3679 plt_index = htab->next_jump_slot_index++;
3682 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3683 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3685 /* Don't fill the second and third slots in PLT entry for
3686 static executables nor without PLT0. */
3687 if (plt == htab->elf.splt && htab->plt.has_plt0)
3689 bfd_put_32 (output_bfd,
3690 plt_index * sizeof (Elf32_External_Rel),
3691 plt->contents + h->plt.offset
3692 + htab->lazy_plt->plt_reloc_offset);
3693 bfd_put_32 (output_bfd,
3695 + htab->lazy_plt->plt_plt_offset + 4),
3696 (plt->contents + h->plt.offset
3697 + htab->lazy_plt->plt_plt_offset));
3701 else if (eh->plt_got.offset != (bfd_vma) -1)
3703 bfd_vma got_offset, plt_offset;
3704 asection *plt, *got, *gotplt;
3705 const bfd_byte *got_plt_entry;
3707 /* Set the entry in the GOT procedure linkage table. */
3708 plt = htab->plt_got;
3709 got = htab->elf.sgot;
3710 gotplt = htab->elf.sgotplt;
3711 got_offset = h->got.offset;
3713 if (got_offset == (bfd_vma) -1
3719 /* Fill in the entry in the GOT procedure linkage table. */
3720 if (! bfd_link_pic (info))
3722 got_plt_entry = htab->non_lazy_plt->plt_entry;
3723 got_offset += got->output_section->vma + got->output_offset;
3727 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3728 got_offset += (got->output_section->vma
3729 + got->output_offset
3730 - gotplt->output_section->vma
3731 - gotplt->output_offset);
3734 plt_offset = eh->plt_got.offset;
3735 memcpy (plt->contents + plt_offset, got_plt_entry,
3736 htab->non_lazy_plt->plt_entry_size);
3737 bfd_put_32 (output_bfd, got_offset,
3738 (plt->contents + plt_offset
3739 + htab->non_lazy_plt->plt_got_offset));
3742 if (!local_undefweak
3744 && (h->plt.offset != (bfd_vma) -1
3745 || eh->plt_got.offset != (bfd_vma) -1))
3747 /* Mark the symbol as undefined, rather than as defined in
3748 the .plt section. Leave the value if there were any
3749 relocations where pointer equality matters (this is a clue
3750 for the dynamic linker, to make function pointer
3751 comparisons work between an application and shared
3752 library), otherwise set it to zero. If a function is only
3753 called from a binary, there is no need to slow down
3754 shared libraries because of that. */
3755 sym->st_shndx = SHN_UNDEF;
3756 if (!h->pointer_equality_needed)
3760 _bfd_x86_elf_link_fixup_ifunc_symbol (info, htab, h, sym);
3762 /* Don't generate dynamic GOT relocation against undefined weak
3763 symbol in executable. */
3764 if (h->got.offset != (bfd_vma) -1
3765 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3766 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3767 && !local_undefweak)
3769 Elf_Internal_Rela rel;
3770 asection *relgot = htab->elf.srelgot;
3772 /* This symbol has an entry in the global offset table. Set it
3775 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3778 rel.r_offset = (htab->elf.sgot->output_section->vma
3779 + htab->elf.sgot->output_offset
3780 + (h->got.offset & ~(bfd_vma) 1));
3782 /* If this is a static link, or it is a -Bsymbolic link and the
3783 symbol is defined locally or was forced to be local because
3784 of a version file, we just want to emit a RELATIVE reloc.
3785 The entry in the global offset table will already have been
3786 initialized in the relocate_section function. */
3788 && h->type == STT_GNU_IFUNC)
3790 if (h->plt.offset == (bfd_vma) -1)
3792 /* STT_GNU_IFUNC is referenced without PLT. */
3793 if (htab->elf.splt == NULL)
3795 /* use .rel[a].iplt section to store .got relocations
3796 in static executable. */
3797 relgot = htab->elf.irelplt;
3799 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3801 info->callbacks->minfo (_("Local IFUNC function `%s' in %pB\n"),
3802 h->root.root.string,
3803 h->root.u.def.section->owner);
3805 bfd_put_32 (output_bfd,
3806 (h->root.u.def.value
3807 + h->root.u.def.section->output_section->vma
3808 + h->root.u.def.section->output_offset),
3809 htab->elf.sgot->contents + h->got.offset);
3810 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3815 else if (bfd_link_pic (info))
3817 /* Generate R_386_GLOB_DAT. */
3825 if (!h->pointer_equality_needed)
3828 /* For non-shared object, we can't use .got.plt, which
3829 contains the real function addres if we need pointer
3830 equality. We load the GOT entry with the PLT entry. */
3831 if (htab->plt_second != NULL)
3833 plt = htab->plt_second;
3834 plt_offset = eh->plt_second.offset;
3838 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3839 plt_offset = h->plt.offset;
3841 bfd_put_32 (output_bfd,
3842 (plt->output_section->vma
3843 + plt->output_offset + plt_offset),
3844 htab->elf.sgot->contents + h->got.offset);
3848 else if (bfd_link_pic (info)
3849 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3851 BFD_ASSERT((h->got.offset & 1) != 0);
3852 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3856 BFD_ASSERT((h->got.offset & 1) == 0);
3858 bfd_put_32 (output_bfd, (bfd_vma) 0,
3859 htab->elf.sgot->contents + h->got.offset);
3860 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3863 elf_append_rel (output_bfd, relgot, &rel);
3868 Elf_Internal_Rela rel;
3871 /* This symbol needs a copy reloc. Set it up. */
3872 VERIFY_COPY_RELOC (h, htab)
3874 rel.r_offset = (h->root.u.def.value
3875 + h->root.u.def.section->output_section->vma
3876 + h->root.u.def.section->output_offset);
3877 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
3878 if (h->root.u.def.section == htab->elf.sdynrelro)
3879 s = htab->elf.sreldynrelro;
3881 s = htab->elf.srelbss;
3882 elf_append_rel (output_bfd, s, &rel);
3888 /* Finish up local dynamic symbol handling. We set the contents of
3889 various dynamic sections here. */
3892 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
3894 struct elf_link_hash_entry *h
3895 = (struct elf_link_hash_entry *) *slot;
3896 struct bfd_link_info *info
3897 = (struct bfd_link_info *) inf;
3899 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
3903 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
3904 here since undefined weak symbol may not be dynamic and may not be
3905 called for elf_i386_finish_dynamic_symbol. */
3908 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
3911 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
3912 struct bfd_link_info *info = (struct bfd_link_info *) inf;
3914 if (h->root.type != bfd_link_hash_undefweak
3915 || h->dynindx != -1)
3918 return elf_i386_finish_dynamic_symbol (info->output_bfd,
3922 /* Used to decide how to sort relocs in an optimal manner for the
3923 dynamic linker, before writing them out. */
3925 static enum elf_reloc_type_class
3926 elf_i386_reloc_type_class (const struct bfd_link_info *info,
3927 const asection *rel_sec ATTRIBUTE_UNUSED,
3928 const Elf_Internal_Rela *rela)
3930 bfd *abfd = info->output_bfd;
3931 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
3932 struct elf_link_hash_table *htab = elf_hash_table (info);
3934 if (htab->dynsym != NULL
3935 && htab->dynsym->contents != NULL)
3937 /* Check relocation against STT_GNU_IFUNC symbol if there are
3939 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
3940 if (r_symndx != STN_UNDEF)
3942 Elf_Internal_Sym sym;
3943 if (!bed->s->swap_symbol_in (abfd,
3944 (htab->dynsym->contents
3945 + r_symndx * sizeof (Elf32_External_Sym)),
3949 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
3950 return reloc_class_ifunc;
3954 switch (ELF32_R_TYPE (rela->r_info))
3956 case R_386_IRELATIVE:
3957 return reloc_class_ifunc;
3958 case R_386_RELATIVE:
3959 return reloc_class_relative;
3960 case R_386_JUMP_SLOT:
3961 return reloc_class_plt;
3963 return reloc_class_copy;
3965 return reloc_class_normal;
3969 /* Finish up the dynamic sections. */
3972 elf_i386_finish_dynamic_sections (bfd *output_bfd,
3973 struct bfd_link_info *info)
3975 struct elf_x86_link_hash_table *htab;
3977 htab = _bfd_x86_elf_finish_dynamic_sections (output_bfd, info);
3981 if (!htab->elf.dynamic_sections_created)
3984 if (htab->elf.splt && htab->elf.splt->size > 0)
3986 /* UnixWare sets the entsize of .plt to 4, although that doesn't
3987 really seem like the right value. */
3988 elf_section_data (htab->elf.splt->output_section)
3989 ->this_hdr.sh_entsize = 4;
3991 if (htab->plt.has_plt0)
3993 /* Fill in the special first entry in the procedure linkage
3995 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
3996 htab->lazy_plt->plt0_entry_size);
3997 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
3998 htab->plt0_pad_byte,
3999 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4000 if (!bfd_link_pic (info))
4002 bfd_put_32 (output_bfd,
4003 (htab->elf.sgotplt->output_section->vma
4004 + htab->elf.sgotplt->output_offset
4006 htab->elf.splt->contents
4007 + htab->lazy_plt->plt0_got1_offset);
4008 bfd_put_32 (output_bfd,
4009 (htab->elf.sgotplt->output_section->vma
4010 + htab->elf.sgotplt->output_offset
4012 htab->elf.splt->contents
4013 + htab->lazy_plt->plt0_got2_offset);
4015 if (htab->target_os == is_vxworks)
4017 Elf_Internal_Rela rel;
4018 int num_plts = (htab->elf.splt->size
4019 / htab->plt.plt_entry_size) - 1;
4021 asection *srelplt2 = htab->srelplt2;
4023 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4024 + 4. On IA32 we use REL relocations so the
4025 addend goes in the PLT directly. */
4026 rel.r_offset = (htab->elf.splt->output_section->vma
4027 + htab->elf.splt->output_offset
4028 + htab->lazy_plt->plt0_got1_offset);
4029 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4031 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4032 srelplt2->contents);
4033 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4035 rel.r_offset = (htab->elf.splt->output_section->vma
4036 + htab->elf.splt->output_offset
4037 + htab->lazy_plt->plt0_got2_offset);
4038 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4040 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4041 srelplt2->contents +
4042 sizeof (Elf32_External_Rel));
4043 /* Correct the .rel.plt.unloaded relocations. */
4044 p = srelplt2->contents;
4045 if (bfd_link_pic (info))
4046 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4048 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4050 for (; num_plts; num_plts--)
4052 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4053 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4055 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4056 p += sizeof (Elf32_External_Rel);
4058 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4059 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4061 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4062 p += sizeof (Elf32_External_Rel);
4069 /* Fill PLT entries for undefined weak symbols in PIE. */
4070 if (bfd_link_pie (info))
4071 bfd_hash_traverse (&info->hash->table,
4072 elf_i386_pie_finish_undefweak_symbol,
4078 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4079 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4080 It has to be done before elf_link_sort_relocs is called so that
4081 dynamic relocations are properly sorted. */
4084 elf_i386_output_arch_local_syms
4085 (bfd *output_bfd ATTRIBUTE_UNUSED,
4086 struct bfd_link_info *info,
4087 void *flaginfo ATTRIBUTE_UNUSED,
4088 int (*func) (void *, const char *,
4091 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4093 struct elf_x86_link_hash_table *htab
4094 = elf_x86_hash_table (info, I386_ELF_DATA);
4098 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4099 htab_traverse (htab->loc_hash_table,
4100 elf_i386_finish_local_dynamic_symbol,
4106 /* Forward declaration. */
4107 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4109 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4110 dynamic relocations. */
4113 elf_i386_get_synthetic_symtab (bfd *abfd,
4114 long symcount ATTRIBUTE_UNUSED,
4115 asymbol **syms ATTRIBUTE_UNUSED,
4122 bfd_byte *plt_contents;
4124 const struct elf_x86_lazy_plt_layout *lazy_plt;
4125 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4126 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4127 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4130 enum elf_x86_plt_type plt_type;
4131 struct elf_x86_plt plts[] =
4133 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4134 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4135 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4136 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4141 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4144 if (dynsymcount <= 0)
4147 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4151 non_lazy_plt = NULL;
4152 /* Silence GCC 6. */
4154 non_lazy_ibt_plt = NULL;
4155 lazy_ibt_plt = NULL;
4156 switch (get_elf_x86_backend_data (abfd)->target_os)
4160 non_lazy_plt = &elf_i386_non_lazy_plt;
4161 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4162 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4165 lazy_plt = &elf_i386_lazy_plt;
4168 lazy_plt = &elf_i386_nacl_plt;
4175 for (j = 0; plts[j].name != NULL; j++)
4177 plt = bfd_get_section_by_name (abfd, plts[j].name);
4178 if (plt == NULL || plt->size == 0)
4181 /* Get the PLT section contents. */
4182 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4183 if (plt_contents == NULL)
4185 if (!bfd_get_section_contents (abfd, (asection *) plt,
4186 plt_contents, 0, plt->size))
4188 free (plt_contents);
4192 /* Check what kind of PLT it is. */
4193 plt_type = plt_unknown;
4194 if (plts[j].type == plt_unknown
4195 && (plt->size >= (lazy_plt->plt0_entry_size
4196 + lazy_plt->plt_entry_size)))
4198 /* Match lazy PLT first. */
4199 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4200 lazy_plt->plt0_got1_offset) == 0)
4202 /* The fist entry in the lazy IBT PLT is the same as the
4204 if (lazy_ibt_plt != NULL
4205 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4206 lazy_ibt_plt->plt_entry,
4207 lazy_ibt_plt->plt_got_offset) == 0))
4208 plt_type = plt_lazy | plt_second;
4210 plt_type = plt_lazy;
4212 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4213 lazy_plt->plt0_got1_offset) == 0)
4215 /* The fist entry in the PIC lazy IBT PLT is the same as
4216 the normal PIC lazy PLT. */
4217 if (lazy_ibt_plt != NULL
4218 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4219 lazy_ibt_plt->pic_plt_entry,
4220 lazy_ibt_plt->plt_got_offset) == 0))
4221 plt_type = plt_lazy | plt_pic | plt_second;
4223 plt_type = plt_lazy | plt_pic;
4227 if (non_lazy_plt != NULL
4228 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4229 && plt->size >= non_lazy_plt->plt_entry_size)
4231 /* Match non-lazy PLT. */
4232 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4233 non_lazy_plt->plt_got_offset) == 0)
4234 plt_type = plt_non_lazy;
4235 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4236 non_lazy_plt->plt_got_offset) == 0)
4240 if ((non_lazy_ibt_plt != NULL)
4241 && (plt_type == plt_unknown || plt_type == plt_second)
4242 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4244 if (memcmp (plt_contents,
4245 non_lazy_ibt_plt->plt_entry,
4246 non_lazy_ibt_plt->plt_got_offset) == 0)
4248 /* Match IBT PLT. */
4249 plt_type = plt_second;
4250 non_lazy_plt = non_lazy_ibt_plt;
4252 else if (memcmp (plt_contents,
4253 non_lazy_ibt_plt->pic_plt_entry,
4254 non_lazy_ibt_plt->plt_got_offset) == 0)
4256 /* Match PIC IBT PLT. */
4257 plt_type = plt_second | plt_pic;
4258 non_lazy_plt = non_lazy_ibt_plt;
4262 if (plt_type == plt_unknown)
4264 free (plt_contents);
4269 plts[j].type = plt_type;
4271 if ((plt_type & plt_lazy))
4273 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4274 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4275 /* Skip PLT0 in lazy PLT. */
4280 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4281 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4285 /* Skip lazy PLT when the second PLT is used. */
4286 if ((plt_type & (plt_lazy | plt_second))
4287 == (plt_lazy | plt_second))
4291 n = plt->size / plts[j].plt_entry_size;
4296 plts[j].contents = plt_contents;
4298 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4299 if ((plt_type & plt_pic))
4300 got_addr = (bfd_vma) -1;
4303 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4304 got_addr, plts, dynsyms,
4308 /* Set up i386 GNU properties. Return the first relocatable ELF input
4309 with GNU properties if found. Otherwise, return NULL. */
4312 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4314 struct elf_x86_init_table init_table;
4316 switch (get_elf_x86_backend_data (info->output_bfd)->target_os)
4320 init_table.plt0_pad_byte = 0x0;
4321 init_table.lazy_plt = &elf_i386_lazy_plt;
4322 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4323 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4324 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4327 init_table.plt0_pad_byte = 0x90;
4328 init_table.lazy_plt = &elf_i386_lazy_plt;
4329 init_table.non_lazy_plt = NULL;
4330 init_table.lazy_ibt_plt = NULL;
4331 init_table.non_lazy_ibt_plt = NULL;
4334 init_table.plt0_pad_byte = 0x90;
4335 init_table.lazy_plt = &elf_i386_nacl_plt;
4336 init_table.non_lazy_plt = NULL;
4337 init_table.lazy_ibt_plt = NULL;
4338 init_table.non_lazy_ibt_plt = NULL;
4342 init_table.r_info = elf32_r_info;
4343 init_table.r_sym = elf32_r_sym;
4345 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4348 #define TARGET_LITTLE_SYM i386_elf32_vec
4349 #define TARGET_LITTLE_NAME "elf32-i386"
4350 #define ELF_ARCH bfd_arch_i386
4351 #define ELF_TARGET_ID I386_ELF_DATA
4352 #define ELF_MACHINE_CODE EM_386
4353 #define ELF_MAXPAGESIZE 0x1000
4355 #define elf_backend_can_gc_sections 1
4356 #define elf_backend_can_refcount 1
4357 #define elf_backend_want_got_plt 1
4358 #define elf_backend_plt_readonly 1
4359 #define elf_backend_want_plt_sym 0
4360 #define elf_backend_got_header_size 12
4361 #define elf_backend_plt_alignment 4
4362 #define elf_backend_dtrel_excludes_plt 1
4363 #define elf_backend_extern_protected_data 1
4364 #define elf_backend_caches_rawsize 1
4365 #define elf_backend_want_dynrelro 1
4367 /* Support RELA for objdump of prelink objects. */
4368 #define elf_info_to_howto elf_i386_info_to_howto_rel
4369 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4371 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4372 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4373 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4374 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4376 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4377 #define elf_backend_check_relocs elf_i386_check_relocs
4378 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4379 #define elf_backend_fake_sections elf_i386_fake_sections
4380 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4381 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4382 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4383 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4384 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4385 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4386 #define elf_backend_relocate_section elf_i386_relocate_section
4387 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4388 #define elf_backend_hide_symbol _bfd_x86_elf_hide_symbol
4390 #define elf_backend_linux_prpsinfo32_ugid16 TRUE
4392 #define elf32_bed elf32_i386_bed
4394 #include "elf32-target.h"
4396 /* FreeBSD support. */
4398 #undef TARGET_LITTLE_SYM
4399 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4400 #undef TARGET_LITTLE_NAME
4401 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4403 #define ELF_OSABI ELFOSABI_FREEBSD
4405 /* The kernel recognizes executables as valid only if they carry a
4406 "FreeBSD" label in the ELF header. So we put this label on all
4407 executables and (for simplicity) also all other object files. */
4410 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4412 _bfd_elf_post_process_headers (abfd, info);
4414 #ifdef OLD_FREEBSD_ABI_LABEL
4416 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4417 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4418 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4423 #undef elf_backend_post_process_headers
4424 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4426 #define elf32_bed elf32_i386_fbsd_bed
4428 #undef elf_backend_add_symbol_hook
4430 #include "elf32-target.h"
4434 #undef TARGET_LITTLE_SYM
4435 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4436 #undef TARGET_LITTLE_NAME
4437 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4439 static const struct elf_x86_backend_data elf_i386_solaris_arch_bed =
4444 #undef elf_backend_arch_data
4445 #define elf_backend_arch_data &elf_i386_solaris_arch_bed
4447 #undef elf_backend_post_process_headers
4449 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4450 objects won't be recognized. */
4454 #define elf32_bed elf32_i386_sol2_bed
4456 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4458 #undef elf_backend_static_tls_alignment
4459 #define elf_backend_static_tls_alignment 8
4461 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4463 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4465 #undef elf_backend_want_plt_sym
4466 #define elf_backend_want_plt_sym 1
4468 #undef elf_backend_strtab_flags
4469 #define elf_backend_strtab_flags SHF_STRINGS
4471 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4472 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4473 FALSE otherwise. ISECTION is the best guess matching section from the
4474 input bfd IBFD, but it might be NULL. */
4477 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4478 bfd *obfd ATTRIBUTE_UNUSED,
4479 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4480 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4482 /* PR 19938: FIXME: Need to add code for setting the sh_info
4483 and sh_link fields of Solaris specific section types. */
4486 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4487 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4489 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4491 The following values should be set:
4494 -----------------------------------------------------------------------------
4495 SHT_SUNW_ancillary The section header index of 0
4496 [0x6fffffee] the associated string table.
4498 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4499 [0x6ffffff0] the associated symbol table. section header index of
4501 SHT_SUNW_capchain table,
4504 SHT_SUNW_symsort The section header index of 0
4505 [0x6ffffff1] the associated symbol table.
4507 SHT_SUNW_tlssort The section header index of 0
4508 [0x6ffffff2] the associated symbol table.
4510 SHT_SUNW_LDYNSYM The section header index of One greater than the
4511 [0x6ffffff3] the associated string table. symbol table index of the
4512 This index is the same string last local symbol,
4513 table used by the SHT_DYNSYM STB_LOCAL. Since
4514 section. SHT_SUNW_LDYNSYM only
4515 contains local symbols,
4516 sh_info is equivalent to
4517 the number of symbols in
4520 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4521 [0x6ffffff5] the section header index of to named strings, the
4522 the associated section header index of
4523 SHT_SUNW_capinfo table, the associated string
4524 otherwise 0. table, otherwise 0.
4526 SHT_SUNW_move The section header index of 0
4527 [0x6ffffffa] the associated symbol table.
4532 SHT_SUNW_syminfo The section header index of The section header index
4533 [0x6ffffffc] the associated symbol table. of the associated
4536 SHT_SUNW_verdef The section header index of The number of version
4537 [0x6ffffffd] the associated string table. definitions within the
4540 SHT_SUNW_verneed The section header index of The number of version
4541 [0x6ffffffe] the associated string table. dependencies within the
4544 SHT_SUNW_versym The section header index of 0
4545 [0x6fffffff] the associated symbol table. */
4548 #undef elf_backend_copy_special_section_fields
4549 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4551 #include "elf32-target.h"
4553 /* Intel MCU support. */
4556 elf32_iamcu_elf_object_p (bfd *abfd)
4558 /* Set the right machine number for an IAMCU elf32 file. */
4559 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4563 #undef TARGET_LITTLE_SYM
4564 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4565 #undef TARGET_LITTLE_NAME
4566 #define TARGET_LITTLE_NAME "elf32-iamcu"
4568 #define ELF_ARCH bfd_arch_iamcu
4570 #undef ELF_MACHINE_CODE
4571 #define ELF_MACHINE_CODE EM_IAMCU
4573 #undef elf_backend_arch_data
4574 #define elf_backend_arch_data &elf_i386_arch_bed
4579 #define elf32_bed elf32_iamcu_bed
4581 #undef elf_backend_object_p
4582 #define elf_backend_object_p elf32_iamcu_elf_object_p
4584 #undef elf_backend_static_tls_alignment
4586 #undef elf_backend_want_plt_sym
4587 #define elf_backend_want_plt_sym 0
4589 #undef elf_backend_strtab_flags
4590 #undef elf_backend_copy_special_section_fields
4592 #include "elf32-target.h"
4594 /* Restore defaults. */
4596 #define ELF_ARCH bfd_arch_i386
4597 #undef ELF_MACHINE_CODE
4598 #define ELF_MACHINE_CODE EM_386
4600 /* Native Client support. */
4602 #undef TARGET_LITTLE_SYM
4603 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4604 #undef TARGET_LITTLE_NAME
4605 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4607 #define elf32_bed elf32_i386_nacl_bed
4609 #undef ELF_MAXPAGESIZE
4610 #define ELF_MAXPAGESIZE 0x10000
4612 /* Restore defaults. */
4614 #undef elf_backend_want_plt_sym
4615 #define elf_backend_want_plt_sym 0
4616 #undef elf_backend_post_process_headers
4617 #undef elf_backend_static_tls_alignment
4619 /* NaCl uses substantially different PLT entries for the same effects. */
4621 #undef elf_backend_plt_alignment
4622 #define elf_backend_plt_alignment 5
4623 #define NACL_PLT_ENTRY_SIZE 64
4624 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4626 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4628 0xff, 0x35, /* pushl contents of address */
4629 0, 0, 0, 0, /* replaced with address of .got + 4. */
4630 0x8b, 0x0d, /* movl contents of address, %ecx */
4631 0, 0, 0, 0, /* replaced with address of .got + 8. */
4632 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4633 0xff, 0xe1 /* jmp *%ecx */
4636 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4638 0x8b, 0x0d, /* movl contents of address, %ecx */
4639 0, 0, 0, 0, /* replaced with GOT slot address. */
4640 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4641 0xff, 0xe1, /* jmp *%ecx */
4643 /* Pad to the next 32-byte boundary with nop instructions. */
4645 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4646 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4648 /* Lazy GOT entries point here (32-byte aligned). */
4649 0x68, /* pushl immediate */
4650 0, 0, 0, 0, /* replaced with reloc offset. */
4651 0xe9, /* jmp relative */
4652 0, 0, 0, 0, /* replaced with offset to .plt. */
4654 /* Pad to the next 32-byte boundary with nop instructions. */
4655 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4656 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4660 static const bfd_byte
4661 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4663 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4664 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4665 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4666 0xff, 0xe1, /* jmp *%ecx */
4668 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4669 so pad to that size with nop instructions. */
4670 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4673 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4675 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4676 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4677 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4678 0xff, 0xe1, /* jmp *%ecx */
4680 /* Pad to the next 32-byte boundary with nop instructions. */
4682 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4683 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4685 /* Lazy GOT entries point here (32-byte aligned). */
4686 0x68, /* pushl immediate */
4687 0, 0, 0, 0, /* replaced with offset into relocation table. */
4688 0xe9, /* jmp relative */
4689 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4691 /* Pad to the next 32-byte boundary with nop instructions. */
4692 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4693 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4697 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4699 #if (PLT_CIE_LENGTH != 20 \
4700 || PLT_FDE_LENGTH != 36 \
4701 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4702 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4703 # error "Need elf_x86_backend_data parameters for eh_frame_plt offsets!"
4705 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4706 0, 0, 0, 0, /* CIE ID */
4707 1, /* CIE version */
4708 'z', 'R', 0, /* Augmentation string */
4709 1, /* Code alignment factor */
4710 0x7c, /* Data alignment factor: -4 */
4711 8, /* Return address column */
4712 1, /* Augmentation size */
4713 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4714 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4715 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4716 DW_CFA_nop, DW_CFA_nop,
4718 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
4719 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
4720 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
4721 0, 0, 0, 0, /* .plt size goes here */
4722 0, /* Augmentation size */
4723 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
4724 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
4725 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
4726 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
4727 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
4728 13, /* Block length */
4729 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
4730 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
4731 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
4732 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
4733 DW_CFA_nop, DW_CFA_nop
4736 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
4738 elf_i386_nacl_plt0_entry, /* plt0_entry */
4739 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
4740 elf_i386_nacl_plt_entry, /* plt_entry */
4741 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
4742 NULL, /* plt_tlsdesc_entry */
4743 0, /* plt_tlsdesc_entry_size*/
4744 0, /* plt_tlsdesc_got1_offset */
4745 0, /* plt_tlsdesc_got2_offset */
4746 0, /* plt_tlsdesc_got1_insn_end */
4747 0, /* plt_tlsdesc_got2_insn_end */
4748 2, /* plt0_got1_offset */
4749 8, /* plt0_got2_offset */
4750 0, /* plt0_got2_insn_end */
4751 2, /* plt_got_offset */
4752 33, /* plt_reloc_offset */
4753 38, /* plt_plt_offset */
4754 0, /* plt_got_insn_size */
4755 0, /* plt_plt_insn_end */
4756 32, /* plt_lazy_offset */
4757 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
4758 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
4759 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
4760 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
4763 static const struct elf_x86_backend_data elf_i386_nacl_arch_bed =
4769 elf32_i386_nacl_elf_object_p (bfd *abfd)
4771 /* Set the right machine number for a NaCl i386 ELF32 file. */
4772 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
4776 #undef elf_backend_arch_data
4777 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
4779 #undef elf_backend_object_p
4780 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
4781 #undef elf_backend_modify_segment_map
4782 #define elf_backend_modify_segment_map nacl_modify_segment_map
4783 #undef elf_backend_modify_program_headers
4784 #define elf_backend_modify_program_headers nacl_modify_program_headers
4785 #undef elf_backend_final_write_processing
4786 #define elf_backend_final_write_processing nacl_final_write_processing
4788 #include "elf32-target.h"
4790 /* Restore defaults. */
4791 #undef elf_backend_object_p
4792 #undef elf_backend_modify_segment_map
4793 #undef elf_backend_modify_program_headers
4794 #undef elf_backend_final_write_processing
4796 /* VxWorks support. */
4798 #undef TARGET_LITTLE_SYM
4799 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
4800 #undef TARGET_LITTLE_NAME
4801 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
4803 #undef ELF_MAXPAGESIZE
4804 #define ELF_MAXPAGESIZE 0x1000
4805 #undef elf_backend_plt_alignment
4806 #define elf_backend_plt_alignment 4
4808 static const struct elf_x86_backend_data elf_i386_vxworks_arch_bed =
4813 #undef elf_backend_arch_data
4814 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
4816 #undef elf_backend_relocs_compatible
4817 #undef elf_backend_add_symbol_hook
4818 #define elf_backend_add_symbol_hook \
4819 elf_vxworks_add_symbol_hook
4820 #undef elf_backend_link_output_symbol_hook
4821 #define elf_backend_link_output_symbol_hook \
4822 elf_vxworks_link_output_symbol_hook
4823 #undef elf_backend_emit_relocs
4824 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
4825 #undef elf_backend_final_write_processing
4826 #define elf_backend_final_write_processing \
4827 elf_vxworks_final_write_processing
4828 #undef elf_backend_static_tls_alignment
4830 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
4832 #undef elf_backend_want_plt_sym
4833 #define elf_backend_want_plt_sym 1
4836 #define elf32_bed elf32_i386_vxworks_bed
4838 #include "elf32-target.h"