1 /* Intel 80386/80486-specific support for 32-bit ELF
2 Copyright (C) 1993-2017 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 #ifdef DEBUG_GEN_RELOC
187 fprintf (stderr, "i386 bfd reloc lookup %d (%s)\n", code, str)
192 static reloc_howto_type *
193 elf_i386_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
194 bfd_reloc_code_real_type code)
199 TRACE ("BFD_RELOC_NONE");
200 return &elf_howto_table[R_386_NONE];
203 TRACE ("BFD_RELOC_32");
204 return &elf_howto_table[R_386_32];
207 TRACE ("BFD_RELOC_CTOR");
208 return &elf_howto_table[R_386_32];
210 case BFD_RELOC_32_PCREL:
211 TRACE ("BFD_RELOC_PC32");
212 return &elf_howto_table[R_386_PC32];
214 case BFD_RELOC_386_GOT32:
215 TRACE ("BFD_RELOC_386_GOT32");
216 return &elf_howto_table[R_386_GOT32];
218 case BFD_RELOC_386_PLT32:
219 TRACE ("BFD_RELOC_386_PLT32");
220 return &elf_howto_table[R_386_PLT32];
222 case BFD_RELOC_386_COPY:
223 TRACE ("BFD_RELOC_386_COPY");
224 return &elf_howto_table[R_386_COPY];
226 case BFD_RELOC_386_GLOB_DAT:
227 TRACE ("BFD_RELOC_386_GLOB_DAT");
228 return &elf_howto_table[R_386_GLOB_DAT];
230 case BFD_RELOC_386_JUMP_SLOT:
231 TRACE ("BFD_RELOC_386_JUMP_SLOT");
232 return &elf_howto_table[R_386_JUMP_SLOT];
234 case BFD_RELOC_386_RELATIVE:
235 TRACE ("BFD_RELOC_386_RELATIVE");
236 return &elf_howto_table[R_386_RELATIVE];
238 case BFD_RELOC_386_GOTOFF:
239 TRACE ("BFD_RELOC_386_GOTOFF");
240 return &elf_howto_table[R_386_GOTOFF];
242 case BFD_RELOC_386_GOTPC:
243 TRACE ("BFD_RELOC_386_GOTPC");
244 return &elf_howto_table[R_386_GOTPC];
246 /* These relocs are a GNU extension. */
247 case BFD_RELOC_386_TLS_TPOFF:
248 TRACE ("BFD_RELOC_386_TLS_TPOFF");
249 return &elf_howto_table[R_386_TLS_TPOFF - R_386_ext_offset];
251 case BFD_RELOC_386_TLS_IE:
252 TRACE ("BFD_RELOC_386_TLS_IE");
253 return &elf_howto_table[R_386_TLS_IE - R_386_ext_offset];
255 case BFD_RELOC_386_TLS_GOTIE:
256 TRACE ("BFD_RELOC_386_TLS_GOTIE");
257 return &elf_howto_table[R_386_TLS_GOTIE - R_386_ext_offset];
259 case BFD_RELOC_386_TLS_LE:
260 TRACE ("BFD_RELOC_386_TLS_LE");
261 return &elf_howto_table[R_386_TLS_LE - R_386_ext_offset];
263 case BFD_RELOC_386_TLS_GD:
264 TRACE ("BFD_RELOC_386_TLS_GD");
265 return &elf_howto_table[R_386_TLS_GD - R_386_ext_offset];
267 case BFD_RELOC_386_TLS_LDM:
268 TRACE ("BFD_RELOC_386_TLS_LDM");
269 return &elf_howto_table[R_386_TLS_LDM - R_386_ext_offset];
272 TRACE ("BFD_RELOC_16");
273 return &elf_howto_table[R_386_16 - R_386_ext_offset];
275 case BFD_RELOC_16_PCREL:
276 TRACE ("BFD_RELOC_16_PCREL");
277 return &elf_howto_table[R_386_PC16 - R_386_ext_offset];
280 TRACE ("BFD_RELOC_8");
281 return &elf_howto_table[R_386_8 - R_386_ext_offset];
283 case BFD_RELOC_8_PCREL:
284 TRACE ("BFD_RELOC_8_PCREL");
285 return &elf_howto_table[R_386_PC8 - R_386_ext_offset];
287 /* Common with Sun TLS implementation. */
288 case BFD_RELOC_386_TLS_LDO_32:
289 TRACE ("BFD_RELOC_386_TLS_LDO_32");
290 return &elf_howto_table[R_386_TLS_LDO_32 - R_386_tls_offset];
292 case BFD_RELOC_386_TLS_IE_32:
293 TRACE ("BFD_RELOC_386_TLS_IE_32");
294 return &elf_howto_table[R_386_TLS_IE_32 - R_386_tls_offset];
296 case BFD_RELOC_386_TLS_LE_32:
297 TRACE ("BFD_RELOC_386_TLS_LE_32");
298 return &elf_howto_table[R_386_TLS_LE_32 - R_386_tls_offset];
300 case BFD_RELOC_386_TLS_DTPMOD32:
301 TRACE ("BFD_RELOC_386_TLS_DTPMOD32");
302 return &elf_howto_table[R_386_TLS_DTPMOD32 - R_386_tls_offset];
304 case BFD_RELOC_386_TLS_DTPOFF32:
305 TRACE ("BFD_RELOC_386_TLS_DTPOFF32");
306 return &elf_howto_table[R_386_TLS_DTPOFF32 - R_386_tls_offset];
308 case BFD_RELOC_386_TLS_TPOFF32:
309 TRACE ("BFD_RELOC_386_TLS_TPOFF32");
310 return &elf_howto_table[R_386_TLS_TPOFF32 - R_386_tls_offset];
312 case BFD_RELOC_SIZE32:
313 TRACE ("BFD_RELOC_SIZE32");
314 return &elf_howto_table[R_386_SIZE32 - R_386_tls_offset];
316 case BFD_RELOC_386_TLS_GOTDESC:
317 TRACE ("BFD_RELOC_386_TLS_GOTDESC");
318 return &elf_howto_table[R_386_TLS_GOTDESC - R_386_tls_offset];
320 case BFD_RELOC_386_TLS_DESC_CALL:
321 TRACE ("BFD_RELOC_386_TLS_DESC_CALL");
322 return &elf_howto_table[R_386_TLS_DESC_CALL - R_386_tls_offset];
324 case BFD_RELOC_386_TLS_DESC:
325 TRACE ("BFD_RELOC_386_TLS_DESC");
326 return &elf_howto_table[R_386_TLS_DESC - R_386_tls_offset];
328 case BFD_RELOC_386_IRELATIVE:
329 TRACE ("BFD_RELOC_386_IRELATIVE");
330 return &elf_howto_table[R_386_IRELATIVE - R_386_tls_offset];
332 case BFD_RELOC_386_GOT32X:
333 TRACE ("BFD_RELOC_386_GOT32X");
334 return &elf_howto_table[R_386_GOT32X - R_386_tls_offset];
336 case BFD_RELOC_VTABLE_INHERIT:
337 TRACE ("BFD_RELOC_VTABLE_INHERIT");
338 return &elf_howto_table[R_386_GNU_VTINHERIT - R_386_vt_offset];
340 case BFD_RELOC_VTABLE_ENTRY:
341 TRACE ("BFD_RELOC_VTABLE_ENTRY");
342 return &elf_howto_table[R_386_GNU_VTENTRY - R_386_vt_offset];
352 static reloc_howto_type *
353 elf_i386_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
358 for (i = 0; i < sizeof (elf_howto_table) / sizeof (elf_howto_table[0]); i++)
359 if (elf_howto_table[i].name != NULL
360 && strcasecmp (elf_howto_table[i].name, r_name) == 0)
361 return &elf_howto_table[i];
366 static reloc_howto_type *
367 elf_i386_rtype_to_howto (bfd *abfd, unsigned r_type)
371 if ((indx = r_type) >= R_386_standard
372 && ((indx = r_type - R_386_ext_offset) - R_386_standard
373 >= R_386_ext - R_386_standard)
374 && ((indx = r_type - R_386_tls_offset) - R_386_ext
375 >= R_386_ext2 - R_386_ext)
376 && ((indx = r_type - R_386_vt_offset) - R_386_ext2
377 >= R_386_vt - R_386_ext2))
379 /* xgettext:c-format */
380 _bfd_error_handler (_("%B: invalid relocation type %d"),
384 /* PR 17512: file: 0f67f69d. */
385 if (elf_howto_table [indx].type != r_type)
387 return &elf_howto_table[indx];
391 elf_i386_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED,
393 Elf_Internal_Rela *dst)
395 unsigned int r_type = ELF32_R_TYPE (dst->r_info);
396 cache_ptr->howto = elf_i386_rtype_to_howto (abfd, r_type);
399 /* Return whether a symbol name implies a local label. The UnixWare
400 2.1 cc generates temporary symbols that start with .X, so we
401 recognize them here. FIXME: do other SVR4 compilers also use .X?.
402 If so, we should move the .X recognition into
403 _bfd_elf_is_local_label_name. */
406 elf_i386_is_local_label_name (bfd *abfd, const char *name)
408 if (name[0] == '.' && name[1] == 'X')
411 return _bfd_elf_is_local_label_name (abfd, name);
414 /* Support for core dump NOTE sections. */
417 elf_i386_grok_prstatus (bfd *abfd, Elf_Internal_Note *note)
422 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
424 int pr_version = bfd_get_32 (abfd, note->descdata);
430 elf_tdata (abfd)->core->signal = bfd_get_32 (abfd, note->descdata + 20);
433 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
437 size = bfd_get_32 (abfd, note->descdata + 8);
441 switch (note->descsz)
446 case 144: /* Linux/i386 */
448 elf_tdata (abfd)->core->signal = bfd_get_16 (abfd, note->descdata + 12);
451 elf_tdata (abfd)->core->lwpid = bfd_get_32 (abfd, note->descdata + 24);
461 /* Make a ".reg/999" section. */
462 return _bfd_elfcore_make_pseudosection (abfd, ".reg",
463 size, note->descpos + offset);
467 elf_i386_grok_psinfo (bfd *abfd, Elf_Internal_Note *note)
469 if (note->namesz == 8 && strcmp (note->namedata, "FreeBSD") == 0)
471 int pr_version = bfd_get_32 (abfd, note->descdata);
476 elf_tdata (abfd)->core->program
477 = _bfd_elfcore_strndup (abfd, note->descdata + 8, 17);
478 elf_tdata (abfd)->core->command
479 = _bfd_elfcore_strndup (abfd, note->descdata + 25, 81);
483 switch (note->descsz)
488 case 124: /* Linux/i386 elf_prpsinfo. */
489 elf_tdata (abfd)->core->pid
490 = bfd_get_32 (abfd, note->descdata + 12);
491 elf_tdata (abfd)->core->program
492 = _bfd_elfcore_strndup (abfd, note->descdata + 28, 16);
493 elf_tdata (abfd)->core->command
494 = _bfd_elfcore_strndup (abfd, note->descdata + 44, 80);
498 /* Note that for some reason, a spurious space is tacked
499 onto the end of the args in some (at least one anyway)
500 implementations, so strip it off if it exists. */
502 char *command = elf_tdata (abfd)->core->command;
503 int n = strlen (command);
505 if (0 < n && command[n - 1] == ' ')
506 command[n - 1] = '\0';
512 /* Functions for the i386 ELF linker.
514 In order to gain some understanding of code in this file without
515 knowing all the intricate details of the linker, note the
518 Functions named elf_i386_* are called by external routines, other
519 functions are only called locally. elf_i386_* functions appear
520 in this file more or less in the order in which they are called
521 from external routines. eg. elf_i386_check_relocs is called
522 early in the link process, elf_i386_finish_dynamic_sections is
523 one of the last functions. */
525 /* The size in bytes of an entry in the lazy procedure linkage table. */
527 #define LAZY_PLT_ENTRY_SIZE 16
529 /* The size in bytes of an entry in the non-lazy procedure linkage
532 #define NON_LAZY_PLT_ENTRY_SIZE 8
534 /* The first entry in an absolute lazy procedure linkage table looks
535 like this. See the SVR4 ABI i386 supplement to see how this works.
536 Will be padded to LAZY_PLT_ENTRY_SIZE with lazy_plt->plt0_pad_byte. */
538 static const bfd_byte elf_i386_lazy_plt0_entry[12] =
540 0xff, 0x35, /* pushl contents of address */
541 0, 0, 0, 0, /* replaced with address of .got + 4. */
542 0xff, 0x25, /* jmp indirect */
543 0, 0, 0, 0 /* replaced with address of .got + 8. */
546 /* Subsequent entries in an absolute lazy procedure linkage table look
549 static const bfd_byte elf_i386_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
551 0xff, 0x25, /* jmp indirect */
552 0, 0, 0, 0, /* replaced with address of this symbol in .got. */
553 0x68, /* pushl immediate */
554 0, 0, 0, 0, /* replaced with offset into relocation table. */
555 0xe9, /* jmp relative */
556 0, 0, 0, 0 /* replaced with offset to start of .plt. */
559 /* The first entry in a PIC lazy procedure linkage table look like
560 this. Will be padded to LAZY_PLT_ENTRY_SIZE with
561 lazy_plt->plt0_pad_byte. */
563 static const bfd_byte elf_i386_pic_lazy_plt0_entry[12] =
565 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
566 0xff, 0xa3, 8, 0, 0, 0 /* jmp *8(%ebx) */
569 /* Subsequent entries in a PIC lazy procedure linkage table look like
572 static const bfd_byte elf_i386_pic_lazy_plt_entry[LAZY_PLT_ENTRY_SIZE] =
574 0xff, 0xa3, /* jmp *offset(%ebx) */
575 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
576 0x68, /* pushl immediate */
577 0, 0, 0, 0, /* replaced with offset into relocation table. */
578 0xe9, /* jmp relative */
579 0, 0, 0, 0 /* replaced with offset to start of .plt. */
582 /* Entries in the non-lazy procedure linkage table look like this. */
584 static const bfd_byte elf_i386_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
586 0xff, 0x25, /* jmp indirect */
587 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
588 0x66, 0x90 /* xchg %ax,%ax */
591 /* Entries in the PIC non-lazy procedure linkage table look like
594 static const bfd_byte elf_i386_pic_non_lazy_plt_entry[NON_LAZY_PLT_ENTRY_SIZE] =
596 0xff, 0xa3, /* jmp *offset(%ebx) */
597 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
598 0x66, 0x90 /* xchg %ax,%ax */
601 /* The first entry in an absolute IBT-enabled lazy procedure linkage
602 table looks like this. */
604 static const bfd_byte elf_i386_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
606 0xff, 0x35, 0, 0, 0, 0, /* pushl GOT[1] */
607 0xff, 0x25, 0, 0, 0, 0, /* jmp *GOT[2] */
608 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
611 /* Subsequent entries for an absolute IBT-enabled lazy procedure linkage
612 table look like this. Subsequent entries for a PIC IBT-enabled lazy
613 procedure linkage table are the same. */
615 static const bfd_byte elf_i386_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
617 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
618 0x68, 0, 0, 0, 0, /* pushl immediate */
619 0xe9, 0, 0, 0, 0, /* jmp relative */
620 0x66, 0x90 /* xchg %ax,%ax */
623 /* The first entry in a PIC IBT-enabled lazy procedure linkage table
626 static const bfd_byte elf_i386_pic_lazy_ibt_plt0_entry[LAZY_PLT_ENTRY_SIZE] =
628 0xff, 0xb3, 4, 0, 0, 0, /* pushl 4(%ebx) */
629 0xff, 0xa3, 8, 0, 0, 0, /* jmp *8(%ebx) */
630 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
633 /* Entries for branches with IBT-enabled in the absolute non-lazey
634 procedure linkage table look like this. They have the same size
635 as the lazy PLT entry. */
637 static const bfd_byte elf_i386_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
639 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
640 0xff, 0x25, 0, 0, 0, 0, /* jmp *name@GOT */
641 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
644 /* Entries for branches with IBT-enabled in the PIC non-lazey procedure
645 linkage table look like this. They have the same size as the lazy
648 static const bfd_byte elf_i386_pic_non_lazy_ibt_plt_entry[LAZY_PLT_ENTRY_SIZE] =
650 0xf3, 0x0f, 0x1e, 0xfb, /* endbr32 */
651 0xff, 0xa3, 0, 0, 0, 0, /* jmp *name@GOT(%ebx) */
652 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
655 /* .eh_frame covering the lazy .plt section. */
657 static const bfd_byte elf_i386_eh_frame_lazy_plt[] =
659 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
660 0, 0, 0, 0, /* CIE ID */
662 'z', 'R', 0, /* Augmentation string */
663 1, /* Code alignment factor */
664 0x7c, /* Data alignment factor */
665 8, /* Return address column */
666 1, /* Augmentation size */
667 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
668 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
669 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
670 DW_CFA_nop, DW_CFA_nop,
672 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
673 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
674 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
675 0, 0, 0, 0, /* .plt size goes here */
676 0, /* Augmentation size */
677 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
678 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
679 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
680 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
681 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
682 11, /* Block length */
683 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
684 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
685 DW_OP_lit15, DW_OP_and, DW_OP_lit11, DW_OP_ge,
686 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
687 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
690 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
692 static const bfd_byte elf_i386_eh_frame_lazy_ibt_plt[] =
694 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
695 0, 0, 0, 0, /* CIE ID */
697 'z', 'R', 0, /* Augmentation string */
698 1, /* Code alignment factor */
699 0x7c, /* Data alignment factor */
700 8, /* Return address column */
701 1, /* Augmentation size */
702 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
703 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
704 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
705 DW_CFA_nop, DW_CFA_nop,
707 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
708 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
709 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
710 0, 0, 0, 0, /* .plt size goes here */
711 0, /* Augmentation size */
712 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
713 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
714 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
715 DW_CFA_advance_loc + 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
716 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
717 11, /* Block length */
718 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
719 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
720 DW_OP_lit15, DW_OP_and, DW_OP_lit9, DW_OP_ge,
721 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
722 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
725 /* .eh_frame covering the non-lazy .plt section. */
727 static const bfd_byte elf_i386_eh_frame_non_lazy_plt[] =
729 #define PLT_GOT_FDE_LENGTH 16
730 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
731 0, 0, 0, 0, /* CIE ID */
733 'z', 'R', 0, /* Augmentation string */
734 1, /* Code alignment factor */
735 0x7c, /* Data alignment factor */
736 8, /* Return address column */
737 1, /* Augmentation size */
738 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
739 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
740 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
741 DW_CFA_nop, DW_CFA_nop,
743 PLT_GOT_FDE_LENGTH, 0, 0, 0, /* FDE length */
744 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
745 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
746 0, 0, 0, 0, /* non-lazy .plt size goes here */
747 0, /* Augmentation size */
748 DW_CFA_nop, DW_CFA_nop, DW_CFA_nop
751 /* These are the standard parameters. */
752 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_plt =
754 elf_i386_lazy_plt0_entry, /* plt0_entry */
755 sizeof (elf_i386_lazy_plt0_entry), /* plt0_entry_size */
756 elf_i386_lazy_plt_entry, /* plt_entry */
757 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
758 2, /* plt0_got1_offset */
759 8, /* plt0_got2_offset */
760 0, /* plt0_got2_insn_end */
761 2, /* plt_got_offset */
762 7, /* plt_reloc_offset */
763 12, /* plt_plt_offset */
764 0, /* plt_got_insn_size */
765 0, /* plt_plt_insn_end */
766 6, /* plt_lazy_offset */
767 elf_i386_pic_lazy_plt0_entry, /* pic_plt0_entry */
768 elf_i386_pic_lazy_plt_entry, /* pic_plt_entry */
769 elf_i386_eh_frame_lazy_plt, /* eh_frame_plt */
770 sizeof (elf_i386_eh_frame_lazy_plt) /* eh_frame_plt_size */
773 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_plt =
775 elf_i386_non_lazy_plt_entry, /* plt_entry */
776 elf_i386_pic_non_lazy_plt_entry, /* pic_plt_entry */
777 NON_LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
778 2, /* plt_got_offset */
779 0, /* plt_got_insn_size */
780 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
781 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
784 static const struct elf_x86_lazy_plt_layout elf_i386_lazy_ibt_plt =
786 elf_i386_lazy_ibt_plt0_entry, /* plt0_entry */
787 sizeof (elf_i386_lazy_ibt_plt0_entry), /* plt0_entry_size */
788 elf_i386_lazy_ibt_plt_entry, /* plt_entry */
789 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
790 2, /* plt0_got1_offset */
791 8, /* plt0_got2_offset */
792 0, /* plt0_got2_insn_end */
793 4+2, /* plt_got_offset */
794 4+1, /* plt_reloc_offset */
795 4+6, /* plt_plt_offset */
796 0, /* plt_got_insn_size */
797 0, /* plt_plt_insn_end */
798 0, /* plt_lazy_offset */
799 elf_i386_pic_lazy_ibt_plt0_entry, /* pic_plt0_entry */
800 elf_i386_lazy_ibt_plt_entry, /* pic_plt_entry */
801 elf_i386_eh_frame_lazy_ibt_plt, /* eh_frame_plt */
802 sizeof (elf_i386_eh_frame_lazy_ibt_plt) /* eh_frame_plt_size */
805 static const struct elf_x86_non_lazy_plt_layout elf_i386_non_lazy_ibt_plt =
807 elf_i386_non_lazy_ibt_plt_entry, /* plt_entry */
808 elf_i386_pic_non_lazy_ibt_plt_entry,/* pic_plt_entry */
809 LAZY_PLT_ENTRY_SIZE, /* plt_entry_size */
810 4+2, /* plt_got_offset */
811 0, /* plt_got_insn_size */
812 elf_i386_eh_frame_non_lazy_plt, /* eh_frame_plt */
813 sizeof (elf_i386_eh_frame_non_lazy_plt) /* eh_frame_plt_size */
817 /* On VxWorks, the .rel.plt.unloaded section has absolute relocations
818 for the PLTResolve stub and then for each PLT entry. */
819 #define PLTRESOLVE_RELOCS_SHLIB 0
820 #define PLTRESOLVE_RELOCS 2
821 #define PLT_NON_JUMP_SLOT_RELOCS 2
823 /* Architecture-specific backend data for i386. */
825 struct elf_i386_backend_data
827 /* Value used to fill the unused bytes of the first PLT entry. */
828 bfd_byte plt0_pad_byte;
839 #define get_elf_i386_backend_data(abfd) \
840 ((const struct elf_i386_backend_data *) \
841 get_elf_backend_data (abfd)->arch_data)
843 /* These are the standard parameters. */
844 static const struct elf_i386_backend_data elf_i386_arch_bed =
846 0, /* plt0_pad_byte */
850 #define elf_backend_arch_data &elf_i386_arch_bed
852 /* Return TRUE if the TLS access code sequence support transition
856 elf_i386_check_tls_transition (asection *sec,
858 Elf_Internal_Shdr *symtab_hdr,
859 struct elf_link_hash_entry **sym_hashes,
861 const Elf_Internal_Rela *rel,
862 const Elf_Internal_Rela *relend)
864 unsigned int val, type, reg;
865 unsigned long r_symndx;
866 struct elf_link_hash_entry *h;
869 bfd_boolean indirect_call;
871 offset = rel->r_offset;
876 if (offset < 2 || (rel + 1) >= relend)
879 indirect_call = FALSE;
880 call = contents + offset + 4;
883 if (r_type == R_386_TLS_GD)
885 /* Check transition from GD access model. Only
886 leal foo@tlsgd(,%ebx,1), %eax
887 call ___tls_get_addr@PLT
889 leal foo@tlsgd(%ebx) %eax
890 call ___tls_get_addr@PLT
893 leal foo@tlsgd(%reg), %eax
894 call *___tls_get_addr@GOT(%reg)
895 which may be converted to
896 addr32 call ___tls_get_addr
897 can transit to different access model. */
898 if ((offset + 10) > sec->size
899 || (type != 0x8d && type != 0x04))
904 /* leal foo@tlsgd(,%ebx,1), %eax
905 call ___tls_get_addr@PLT */
909 if (*(call - 7) != 0x8d
917 leal foo@tlsgd(%ebx), %eax
918 call ___tls_get_addr@PLT
921 leal foo@tlsgd(%reg), %eax
922 call *___tls_get_addr@GOT(%reg)
923 which may be converted to
924 addr32 call ___tls_get_addr
926 %eax can't be used as the GOT base register since it
927 is used to pass parameter to ___tls_get_addr. */
929 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
932 indirect_call = call[0] == 0xff;
933 if (!(reg == 3 && call[0] == 0xe8 && call[5] == 0x90)
934 && !(call[0] == 0x67 && call[1] == 0xe8)
936 && (call[1] & 0xf8) == 0x90
937 && (call[1] & 0x7) == reg))
943 /* Check transition from LD access model. Only
944 leal foo@tlsldm(%ebx), %eax
945 call ___tls_get_addr@PLT
947 leal foo@tlsldm(%reg), %eax
948 call *___tls_get_addr@GOT(%reg)
949 which may be converted to
950 addr32 call ___tls_get_addr
951 can transit to different access model. */
952 if (type != 0x8d || (offset + 9) > sec->size)
955 /* %eax can't be used as the GOT base register since it is
956 used to pass parameter to ___tls_get_addr. */
958 if ((val & 0xf8) != 0x80 || reg == 4 || reg == 0)
961 indirect_call = call[0] == 0xff;
962 if (!(reg == 3 && call[0] == 0xe8)
963 && !(call[0] == 0x67 && call[1] == 0xe8)
965 && (call[1] & 0xf8) == 0x90
966 && (call[1] & 0x7) == reg))
970 r_symndx = ELF32_R_SYM (rel[1].r_info);
971 if (r_symndx < symtab_hdr->sh_info)
974 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
976 || !((struct elf_x86_link_hash_entry *) h)->tls_get_addr)
978 else if (indirect_call)
979 return (ELF32_R_TYPE (rel[1].r_info) == R_386_GOT32X);
981 return (ELF32_R_TYPE (rel[1].r_info) == R_386_PC32
982 || ELF32_R_TYPE (rel[1].r_info) == R_386_PLT32);
985 /* Check transition from IE access model:
986 movl foo@indntpoff(%rip), %eax
987 movl foo@indntpoff(%rip), %reg
988 addl foo@indntpoff(%rip), %reg
991 if (offset < 1 || (offset + 4) > sec->size)
994 /* Check "movl foo@tpoff(%rip), %eax" first. */
995 val = bfd_get_8 (abfd, contents + offset - 1);
1002 /* Check movl|addl foo@tpoff(%rip), %reg. */
1003 type = bfd_get_8 (abfd, contents + offset - 2);
1004 return ((type == 0x8b || type == 0x03)
1005 && (val & 0xc7) == 0x05);
1007 case R_386_TLS_GOTIE:
1008 case R_386_TLS_IE_32:
1009 /* Check transition from {IE_32,GOTIE} access model:
1010 subl foo@{tpoff,gontoff}(%reg1), %reg2
1011 movl foo@{tpoff,gontoff}(%reg1), %reg2
1012 addl foo@{tpoff,gontoff}(%reg1), %reg2
1015 if (offset < 2 || (offset + 4) > sec->size)
1018 val = bfd_get_8 (abfd, contents + offset - 1);
1019 if ((val & 0xc0) != 0x80 || (val & 7) == 4)
1022 type = bfd_get_8 (abfd, contents + offset - 2);
1023 return type == 0x8b || type == 0x2b || type == 0x03;
1025 case R_386_TLS_GOTDESC:
1026 /* Check transition from GDesc access model:
1027 leal x@tlsdesc(%ebx), %eax
1029 Make sure it's a leal adding ebx to a 32-bit offset
1030 into any register, although it's probably almost always
1033 if (offset < 2 || (offset + 4) > sec->size)
1036 if (bfd_get_8 (abfd, contents + offset - 2) != 0x8d)
1039 val = bfd_get_8 (abfd, contents + offset - 1);
1040 return (val & 0xc7) == 0x83;
1042 case R_386_TLS_DESC_CALL:
1043 /* Check transition from GDesc access model:
1044 call *x@tlsdesc(%eax)
1046 if (offset + 2 <= sec->size)
1048 /* Make sure that it's a call *x@tlsdesc(%eax). */
1049 call = contents + offset;
1050 return call[0] == 0xff && call[1] == 0x10;
1060 /* Return TRUE if the TLS access transition is OK or no transition
1061 will be performed. Update R_TYPE if there is a transition. */
1064 elf_i386_tls_transition (struct bfd_link_info *info, bfd *abfd,
1065 asection *sec, bfd_byte *contents,
1066 Elf_Internal_Shdr *symtab_hdr,
1067 struct elf_link_hash_entry **sym_hashes,
1068 unsigned int *r_type, int tls_type,
1069 const Elf_Internal_Rela *rel,
1070 const Elf_Internal_Rela *relend,
1071 struct elf_link_hash_entry *h,
1072 unsigned long r_symndx,
1073 bfd_boolean from_relocate_section)
1075 unsigned int from_type = *r_type;
1076 unsigned int to_type = from_type;
1077 bfd_boolean check = TRUE;
1079 /* Skip TLS transition for functions. */
1081 && (h->type == STT_FUNC
1082 || h->type == STT_GNU_IFUNC))
1088 case R_386_TLS_GOTDESC:
1089 case R_386_TLS_DESC_CALL:
1090 case R_386_TLS_IE_32:
1092 case R_386_TLS_GOTIE:
1093 if (bfd_link_executable (info))
1096 to_type = R_386_TLS_LE_32;
1097 else if (from_type != R_386_TLS_IE
1098 && from_type != R_386_TLS_GOTIE)
1099 to_type = R_386_TLS_IE_32;
1102 /* When we are called from elf_i386_relocate_section, there may
1103 be additional transitions based on TLS_TYPE. */
1104 if (from_relocate_section)
1106 unsigned int new_to_type = to_type;
1108 if (TLS_TRANSITION_IE_TO_LE_P (info, h, tls_type))
1109 new_to_type = R_386_TLS_LE_32;
1111 if (to_type == R_386_TLS_GD
1112 || to_type == R_386_TLS_GOTDESC
1113 || to_type == R_386_TLS_DESC_CALL)
1115 if (tls_type == GOT_TLS_IE_POS)
1116 new_to_type = R_386_TLS_GOTIE;
1117 else if (tls_type & GOT_TLS_IE)
1118 new_to_type = R_386_TLS_IE_32;
1121 /* We checked the transition before when we were called from
1122 elf_i386_check_relocs. We only want to check the new
1123 transition which hasn't been checked before. */
1124 check = new_to_type != to_type && from_type == to_type;
1125 to_type = new_to_type;
1131 if (bfd_link_executable (info))
1132 to_type = R_386_TLS_LE_32;
1139 /* Return TRUE if there is no transition. */
1140 if (from_type == to_type)
1143 /* Check if the transition can be performed. */
1145 && ! elf_i386_check_tls_transition (sec, contents,
1146 symtab_hdr, sym_hashes,
1147 from_type, rel, relend))
1149 reloc_howto_type *from, *to;
1152 from = elf_i386_rtype_to_howto (abfd, from_type);
1153 to = elf_i386_rtype_to_howto (abfd, to_type);
1156 name = h->root.root.string;
1159 struct elf_x86_link_hash_table *htab;
1161 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1166 Elf_Internal_Sym *isym;
1168 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1170 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1175 /* xgettext:c-format */
1176 (_("%B: TLS transition from %s to %s against `%s' at %#Lx "
1177 "in section `%A' failed"),
1178 abfd, from->name, to->name, name,
1179 rel->r_offset, sec);
1180 bfd_set_error (bfd_error_bad_value);
1188 /* With the local symbol, foo, we convert
1189 mov foo@GOT[(%reg1)], %reg2
1191 lea foo[@GOTOFF(%reg1)], %reg2
1193 call/jmp *foo@GOT[(%reg)]
1195 nop call foo/jmp foo nop
1196 When PIC is false, convert
1197 test %reg1, foo@GOT[(%reg2)]
1201 binop foo@GOT[(%reg1)], %reg2
1204 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1209 elf_i386_convert_load_reloc (bfd *abfd, Elf_Internal_Shdr *symtab_hdr,
1211 unsigned int *r_type_p,
1212 Elf_Internal_Rela *irel,
1213 struct elf_link_hash_entry *h,
1214 bfd_boolean *converted,
1215 struct bfd_link_info *link_info)
1217 struct elf_x86_link_hash_table *htab;
1218 unsigned int opcode;
1220 bfd_boolean baseless;
1221 Elf_Internal_Sym *isym;
1222 unsigned int addend;
1226 bfd_boolean to_reloc_32;
1227 unsigned int r_type;
1228 unsigned int r_symndx;
1229 bfd_vma roff = irel->r_offset;
1230 bfd_boolean local_ref;
1231 struct elf_x86_link_hash_entry *eh;
1236 /* Addend for R_386_GOT32X relocations must be 0. */
1237 addend = bfd_get_32 (abfd, contents + roff);
1241 htab = elf_x86_hash_table (link_info, I386_ELF_DATA);
1242 is_pic = bfd_link_pic (link_info);
1245 r_symndx = ELF32_R_SYM (irel->r_info);
1247 modrm = bfd_get_8 (abfd, contents + roff - 1);
1248 baseless = (modrm & 0xc7) == 0x5;
1250 if (baseless && is_pic)
1252 /* For PIC, disallow R_386_GOT32X without a base register
1253 since we don't know what the GOT base is. */
1258 isym = bfd_sym_from_r_symndx (&htab->sym_cache, abfd,
1260 name = bfd_elf_sym_name (abfd, symtab_hdr, isym, NULL);
1263 name = h->root.root.string;
1266 /* xgettext:c-format */
1267 (_("%B: direct GOT relocation R_386_GOT32X against `%s' without base"
1268 " register can not be used when making a shared object"),
1273 opcode = bfd_get_8 (abfd, contents + roff - 2);
1275 /* Convert to R_386_32 if PIC is false or there is no base
1277 to_reloc_32 = !is_pic || baseless;
1279 eh = elf_x86_hash_entry (h);
1281 /* Try to convert R_386_GOT32X. Get the symbol referred to by the
1285 if (opcode == 0x0ff)
1286 /* Convert "call/jmp *foo@GOT[(%reg)]". */
1287 goto convert_branch;
1289 /* Convert "mov foo@GOT[(%reg1)], %reg2",
1290 "test %reg1, foo@GOT(%reg2)" and
1291 "binop foo@GOT[(%reg1)], %reg2". */
1295 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1296 local_ref = SYMBOL_REFERENCES_LOCAL_P (link_info, h);
1298 /* Undefined weak symbol is only bound locally in executable
1299 and its reference is resolved as 0. */
1300 if (h->root.type == bfd_link_hash_undefweak
1306 /* No direct branch to 0 for PIC. */
1310 goto convert_branch;
1314 /* We can convert load of address 0 to R_386_32. */
1322 /* We have "call/jmp *foo@GOT[(%reg)]". */
1323 if ((h->root.type == bfd_link_hash_defined
1324 || h->root.type == bfd_link_hash_defweak)
1327 /* The function is locally defined. */
1329 /* Convert R_386_GOT32X to R_386_PC32. */
1330 if (modrm == 0x15 || (modrm & 0xf8) == 0x90)
1332 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1335 /* To support TLS optimization, always use addr32 prefix
1336 for "call *___tls_get_addr@GOT(%reg)". */
1337 if (eh && eh->tls_get_addr)
1340 nop_offset = irel->r_offset - 2;
1344 nop = link_info->call_nop_byte;
1345 if (link_info->call_nop_as_suffix)
1347 nop_offset = roff + 3;
1348 irel->r_offset -= 1;
1351 nop_offset = roff - 2;
1356 /* Convert to "jmp foo nop". */
1359 nop_offset = roff + 3;
1360 irel->r_offset -= 1;
1363 bfd_put_8 (abfd, nop, contents + nop_offset);
1364 bfd_put_8 (abfd, modrm, contents + irel->r_offset - 1);
1365 /* When converting to PC-relative relocation, we
1366 need to adjust addend by -4. */
1367 bfd_put_32 (abfd, -4, contents + irel->r_offset);
1368 irel->r_info = ELF32_R_INFO (r_symndx, R_386_PC32);
1369 *r_type_p = R_386_PC32;
1375 /* We have "mov foo@GOT[(%re1g)], %reg2",
1376 "test %reg1, foo@GOT(%reg2)" and
1377 "binop foo@GOT[(%reg1)], %reg2".
1379 Avoid optimizing _DYNAMIC since ld.so may use its
1380 link-time address. */
1381 if (h == htab->elf.hdynamic)
1384 /* def_regular is set by an assignment in a linker script in
1385 bfd_elf_record_link_assignment. start_stop is set on
1386 __start_SECNAME/__stop_SECNAME which mark section SECNAME. */
1390 || h->root.type == bfd_link_hash_defined
1391 || h->root.type == bfd_link_hash_defweak)
1399 /* Convert "mov foo@GOT[(%reg1)], %reg2" to
1400 "mov $foo, %reg2" with R_386_32. */
1402 modrm = 0xc0 | (modrm & 0x38) >> 3;
1403 bfd_put_8 (abfd, modrm, contents + roff - 1);
1408 /* Convert "mov foo@GOT(%reg1), %reg2" to
1409 "lea foo@GOTOFF(%reg1), %reg2". */
1410 r_type = R_386_GOTOFF;
1416 /* Only R_386_32 is supported. */
1422 /* Convert "test %reg1, foo@GOT(%reg2)" to
1423 "test $foo, %reg1". */
1424 modrm = 0xc0 | (modrm & 0x38) >> 3;
1429 /* Convert "binop foo@GOT(%reg1), %reg2" to
1430 "binop $foo, %reg2". */
1432 | (modrm & 0x38) >> 3
1436 bfd_put_8 (abfd, modrm, contents + roff - 1);
1440 bfd_put_8 (abfd, opcode, contents + roff - 2);
1441 irel->r_info = ELF32_R_INFO (r_symndx, r_type);
1450 /* Rename some of the generic section flags to better document how they
1452 #define check_relocs_failed sec_flg0
1454 /* Look through the relocs for a section during the first phase, and
1455 calculate needed space in the global offset table, procedure linkage
1456 table, and dynamic reloc sections. */
1459 elf_i386_check_relocs (bfd *abfd,
1460 struct bfd_link_info *info,
1462 const Elf_Internal_Rela *relocs)
1464 struct elf_x86_link_hash_table *htab;
1465 Elf_Internal_Shdr *symtab_hdr;
1466 struct elf_link_hash_entry **sym_hashes;
1467 const Elf_Internal_Rela *rel;
1468 const Elf_Internal_Rela *rel_end;
1471 bfd_boolean converted;
1473 if (bfd_link_relocatable (info))
1476 /* Don't do anything special with non-loaded, non-alloced sections.
1477 In particular, any relocs in such sections should not affect GOT
1478 and PLT reference counting (ie. we don't allow them to create GOT
1479 or PLT entries), there's no possibility or desire to optimize TLS
1480 relocs, and there's not much point in propagating relocs to shared
1481 libs that the dynamic linker won't relocate. */
1482 if ((sec->flags & SEC_ALLOC) == 0)
1485 htab = elf_x86_hash_table (info, I386_ELF_DATA);
1488 sec->check_relocs_failed = 1;
1492 BFD_ASSERT (is_x86_elf (abfd, htab));
1494 /* Get the section contents. */
1495 if (elf_section_data (sec)->this_hdr.contents != NULL)
1496 contents = elf_section_data (sec)->this_hdr.contents;
1497 else if (!bfd_malloc_and_get_section (abfd, sec, &contents))
1499 sec->check_relocs_failed = 1;
1503 symtab_hdr = &elf_symtab_hdr (abfd);
1504 sym_hashes = elf_sym_hashes (abfd);
1510 rel_end = relocs + sec->reloc_count;
1511 for (rel = relocs; rel < rel_end; rel++)
1513 unsigned int r_type;
1514 unsigned int r_symndx;
1515 struct elf_link_hash_entry *h;
1516 struct elf_x86_link_hash_entry *eh;
1517 Elf_Internal_Sym *isym;
1519 bfd_boolean size_reloc;
1521 r_symndx = ELF32_R_SYM (rel->r_info);
1522 r_type = ELF32_R_TYPE (rel->r_info);
1524 if (r_symndx >= NUM_SHDR_ENTRIES (symtab_hdr))
1526 /* xgettext:c-format */
1527 _bfd_error_handler (_("%B: bad symbol index: %d"),
1532 if (r_symndx < symtab_hdr->sh_info)
1534 /* A local symbol. */
1535 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1540 /* Check relocation against local STT_GNU_IFUNC symbol. */
1541 if (ELF32_ST_TYPE (isym->st_info) == STT_GNU_IFUNC)
1543 h = _bfd_elf_x86_get_local_sym_hash (htab, abfd, rel, TRUE);
1547 /* Fake a STT_GNU_IFUNC symbol. */
1548 h->root.root.string = bfd_elf_sym_name (abfd, symtab_hdr,
1550 h->type = STT_GNU_IFUNC;
1553 h->forced_local = 1;
1554 h->root.type = bfd_link_hash_defined;
1562 h = sym_hashes[r_symndx - symtab_hdr->sh_info];
1563 while (h->root.type == bfd_link_hash_indirect
1564 || h->root.type == bfd_link_hash_warning)
1565 h = (struct elf_link_hash_entry *) h->root.u.i.link;
1568 eh = (struct elf_x86_link_hash_entry *) h;
1571 if (r_type == R_386_GOTOFF)
1574 /* It is referenced by a non-shared object. */
1576 h->root.non_ir_ref_regular = 1;
1578 if (h->type == STT_GNU_IFUNC)
1579 elf_tdata (info->output_bfd)->has_gnu_symbols
1580 |= elf_gnu_symbol_ifunc;
1583 if (r_type == R_386_GOT32X
1584 && (h == NULL || h->type != STT_GNU_IFUNC))
1586 Elf_Internal_Rela *irel = (Elf_Internal_Rela *) rel;
1587 if (!elf_i386_convert_load_reloc (abfd, symtab_hdr, contents,
1593 if (! elf_i386_tls_transition (info, abfd, sec, contents,
1594 symtab_hdr, sym_hashes,
1595 &r_type, GOT_UNKNOWN,
1596 rel, rel_end, h, r_symndx, FALSE))
1602 htab->tls_ld_or_ldm_got.refcount += 1;
1606 /* This symbol requires a procedure linkage table entry. We
1607 actually build the entry in adjust_dynamic_symbol,
1608 because this might be a case of linking PIC code which is
1609 never referenced by a dynamic object, in which case we
1610 don't need to generate a procedure linkage table entry
1613 /* If this is a local symbol, we resolve it directly without
1614 creating a procedure linkage table entry. */
1618 eh->has_got_reloc = 1;
1620 h->plt.refcount += 1;
1627 case R_386_TLS_IE_32:
1629 case R_386_TLS_GOTIE:
1630 if (!bfd_link_executable (info))
1631 info->flags |= DF_STATIC_TLS;
1637 case R_386_TLS_GOTDESC:
1638 case R_386_TLS_DESC_CALL:
1639 /* This symbol requires a global offset table entry. */
1641 int tls_type, old_tls_type;
1648 tls_type = GOT_NORMAL;
1650 case R_386_TLS_GD: tls_type = GOT_TLS_GD; break;
1651 case R_386_TLS_GOTDESC:
1652 case R_386_TLS_DESC_CALL:
1653 tls_type = GOT_TLS_GDESC; break;
1654 case R_386_TLS_IE_32:
1655 if (ELF32_R_TYPE (rel->r_info) == r_type)
1656 tls_type = GOT_TLS_IE_NEG;
1658 /* If this is a GD->IE transition, we may use either of
1659 R_386_TLS_TPOFF and R_386_TLS_TPOFF32. */
1660 tls_type = GOT_TLS_IE;
1663 case R_386_TLS_GOTIE:
1664 tls_type = GOT_TLS_IE_POS; break;
1669 h->got.refcount += 1;
1670 old_tls_type = elf_x86_hash_entry (h)->tls_type;
1674 bfd_signed_vma *local_got_refcounts;
1676 /* This is a global offset table entry for a local symbol. */
1677 local_got_refcounts = elf_local_got_refcounts (abfd);
1678 if (local_got_refcounts == NULL)
1682 size = symtab_hdr->sh_info;
1683 size *= (sizeof (bfd_signed_vma)
1684 + sizeof (bfd_vma) + sizeof(char));
1685 local_got_refcounts = (bfd_signed_vma *)
1686 bfd_zalloc (abfd, size);
1687 if (local_got_refcounts == NULL)
1689 elf_local_got_refcounts (abfd) = local_got_refcounts;
1690 elf_x86_local_tlsdesc_gotent (abfd)
1691 = (bfd_vma *) (local_got_refcounts + symtab_hdr->sh_info);
1692 elf_x86_local_got_tls_type (abfd)
1693 = (char *) (local_got_refcounts + 2 * symtab_hdr->sh_info);
1695 local_got_refcounts[r_symndx] += 1;
1696 old_tls_type = elf_x86_local_got_tls_type (abfd) [r_symndx];
1699 if ((old_tls_type & GOT_TLS_IE) && (tls_type & GOT_TLS_IE))
1700 tls_type |= old_tls_type;
1701 /* If a TLS symbol is accessed using IE at least once,
1702 there is no point to use dynamic model for it. */
1703 else if (old_tls_type != tls_type && old_tls_type != GOT_UNKNOWN
1704 && (! GOT_TLS_GD_ANY_P (old_tls_type)
1705 || (tls_type & GOT_TLS_IE) == 0))
1707 if ((old_tls_type & GOT_TLS_IE) && GOT_TLS_GD_ANY_P (tls_type))
1708 tls_type = old_tls_type;
1709 else if (GOT_TLS_GD_ANY_P (old_tls_type)
1710 && GOT_TLS_GD_ANY_P (tls_type))
1711 tls_type |= old_tls_type;
1715 name = h->root.root.string;
1717 name = bfd_elf_sym_name (abfd, symtab_hdr, isym,
1720 /* xgettext:c-format */
1721 (_("%B: `%s' accessed both as normal and "
1722 "thread local symbol"),
1724 bfd_set_error (bfd_error_bad_value);
1729 if (old_tls_type != tls_type)
1732 elf_x86_hash_entry (h)->tls_type = tls_type;
1734 elf_x86_local_got_tls_type (abfd) [r_symndx] = tls_type;
1742 if (r_type != R_386_TLS_IE)
1745 eh->has_got_reloc = 1;
1750 case R_386_TLS_LE_32:
1753 eh->has_got_reloc = 1;
1754 if (bfd_link_executable (info))
1756 info->flags |= DF_STATIC_TLS;
1761 if (eh != NULL && (sec->flags & SEC_CODE) != 0)
1762 eh->has_non_got_reloc = 1;
1764 /* We are called after all symbols have been resolved. Only
1765 relocation against STT_GNU_IFUNC symbol must go through
1768 && (bfd_link_executable (info)
1769 || h->type == STT_GNU_IFUNC))
1771 /* If this reloc is in a read-only section, we might
1772 need a copy reloc. We can't check reliably at this
1773 stage whether the section is read-only, as input
1774 sections have not yet been mapped to output sections.
1775 Tentatively set the flag for now, and correct in
1776 adjust_dynamic_symbol. */
1779 /* We may need a .plt entry if the symbol is a function
1780 defined in a shared lib or is a STT_GNU_IFUNC function
1781 referenced from the code or read-only section. */
1783 || (sec->flags & (SEC_CODE | SEC_READONLY)) != 0)
1784 h->plt.refcount += 1;
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 (_("%B: 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 eh->func_pointer_refcount += 1;
1816 /* If we are creating a shared library, and this is a reloc
1817 against a global symbol, or a non PC relative reloc
1818 against a local symbol, then we need to copy the reloc
1819 into the shared library. However, if we are linking with
1820 -Bsymbolic, we do not need to copy a reloc against a
1821 global symbol which is defined in an object we are
1822 including in the link (i.e., DEF_REGULAR is set). At
1823 this point we have not seen all the input files, so it is
1824 possible that DEF_REGULAR is not set now but will be set
1825 later (it is never cleared). In case of a weak definition,
1826 DEF_REGULAR may be cleared later by a strong definition in
1827 a shared library. We account for that possibility below by
1828 storing information in the relocs_copied field of the hash
1829 table entry. A similar situation occurs when creating
1830 shared libraries and symbol visibility changes render the
1833 If on the other hand, we are creating an executable, we
1834 may need to keep relocations for symbols satisfied by a
1835 dynamic library if we manage to avoid copy relocs for the
1838 Generate dynamic pointer relocation against STT_GNU_IFUNC
1839 symbol in the non-code section. */
1840 if ((bfd_link_pic (info)
1841 && (r_type != R_386_PC32
1843 && (! (bfd_link_pie (info)
1844 || SYMBOLIC_BIND (info, h))
1845 || h->root.type == bfd_link_hash_defweak
1846 || !h->def_regular))))
1848 && h->type == STT_GNU_IFUNC
1849 && r_type == R_386_32
1850 && (sec->flags & SEC_CODE) == 0)
1851 || (ELIMINATE_COPY_RELOCS
1852 && !bfd_link_pic (info)
1854 && (h->root.type == bfd_link_hash_defweak
1855 || !h->def_regular)))
1857 struct elf_dyn_relocs *p;
1858 struct elf_dyn_relocs **head;
1860 /* We must copy these reloc types into the output file.
1861 Create a reloc section in dynobj and make room for
1865 sreloc = _bfd_elf_make_dynamic_reloc_section
1866 (sec, htab->elf.dynobj, 2, abfd, /*rela?*/ FALSE);
1872 /* If this is a global symbol, we count the number of
1873 relocations we need for this symbol. */
1876 head = &eh->dyn_relocs;
1880 /* Track dynamic relocs needed for local syms too.
1881 We really need local syms available to do this
1886 isym = bfd_sym_from_r_symndx (&htab->sym_cache,
1891 s = bfd_section_from_elf_index (abfd, isym->st_shndx);
1895 vpp = &elf_section_data (s)->local_dynrel;
1896 head = (struct elf_dyn_relocs **)vpp;
1900 if (p == NULL || p->sec != sec)
1902 bfd_size_type amt = sizeof *p;
1903 p = (struct elf_dyn_relocs *) bfd_alloc (htab->elf.dynobj,
1915 /* Count size relocation as PC-relative relocation. */
1916 if (r_type == R_386_PC32 || size_reloc)
1921 /* This relocation describes the C++ object vtable hierarchy.
1922 Reconstruct it for later use during GC. */
1923 case R_386_GNU_VTINHERIT:
1924 if (!bfd_elf_gc_record_vtinherit (abfd, sec, h, rel->r_offset))
1928 /* This relocation describes which C++ vtable entries are actually
1929 used. Record for later use during GC. */
1930 case R_386_GNU_VTENTRY:
1931 BFD_ASSERT (h != NULL);
1933 && !bfd_elf_gc_record_vtentry (abfd, sec, h, rel->r_offset))
1942 if (elf_section_data (sec)->this_hdr.contents != contents)
1944 if (!converted && !info->keep_memory)
1948 /* Cache the section contents for elf_link_input_bfd if any
1949 load is converted or --no-keep-memory isn't used. */
1950 elf_section_data (sec)->this_hdr.contents = contents;
1954 /* Cache relocations if any load is converted. */
1955 if (elf_section_data (sec)->relocs != relocs && converted)
1956 elf_section_data (sec)->relocs = (Elf_Internal_Rela *) relocs;
1961 if (elf_section_data (sec)->this_hdr.contents != contents)
1963 sec->check_relocs_failed = 1;
1967 /* Set the correct type for an x86 ELF section. We do this by the
1968 section name, which is a hack, but ought to work. */
1971 elf_i386_fake_sections (bfd *abfd ATTRIBUTE_UNUSED,
1972 Elf_Internal_Shdr *hdr,
1977 name = bfd_get_section_name (abfd, sec);
1979 /* This is an ugly, but unfortunately necessary hack that is
1980 needed when producing EFI binaries on x86. It tells
1981 elf.c:elf_fake_sections() not to consider ".reloc" as a section
1982 containing ELF relocation info. We need this hack in order to
1983 be able to generate ELF binaries that can be translated into
1984 EFI applications (which are essentially COFF objects). Those
1985 files contain a COFF ".reloc" section inside an ELFNN object,
1986 which would normally cause BFD to segfault because it would
1987 attempt to interpret this section as containing relocation
1988 entries for section "oc". With this hack enabled, ".reloc"
1989 will be treated as a normal data section, which will avoid the
1990 segfault. However, you won't be able to create an ELFNN binary
1991 with a section named "oc" that needs relocations, but that's
1992 the kind of ugly side-effects you get when detecting section
1993 types based on their names... In practice, this limitation is
1994 unlikely to bite. */
1995 if (strcmp (name, ".reloc") == 0)
1996 hdr->sh_type = SHT_PROGBITS;
2001 /* Return the relocation value for @tpoff relocation
2002 if STT_TLS virtual address is ADDRESS. */
2005 elf_i386_tpoff (struct bfd_link_info *info, bfd_vma address)
2007 struct elf_link_hash_table *htab = elf_hash_table (info);
2008 const struct elf_backend_data *bed = get_elf_backend_data (info->output_bfd);
2009 bfd_vma static_tls_size;
2011 /* If tls_sec is NULL, we should have signalled an error already. */
2012 if (htab->tls_sec == NULL)
2015 /* Consider special static TLS alignment requirements. */
2016 static_tls_size = BFD_ALIGN (htab->tls_size, bed->static_tls_alignment);
2017 return static_tls_size + htab->tls_sec->vma - address;
2020 /* Relocate an i386 ELF section. */
2023 elf_i386_relocate_section (bfd *output_bfd,
2024 struct bfd_link_info *info,
2026 asection *input_section,
2028 Elf_Internal_Rela *relocs,
2029 Elf_Internal_Sym *local_syms,
2030 asection **local_sections)
2032 struct elf_x86_link_hash_table *htab;
2033 Elf_Internal_Shdr *symtab_hdr;
2034 struct elf_link_hash_entry **sym_hashes;
2035 bfd_vma *local_got_offsets;
2036 bfd_vma *local_tlsdesc_gotents;
2037 Elf_Internal_Rela *rel;
2038 Elf_Internal_Rela *wrel;
2039 Elf_Internal_Rela *relend;
2040 bfd_boolean is_vxworks_tls;
2041 unsigned plt_entry_size;
2043 /* Skip if check_relocs failed. */
2044 if (input_section->check_relocs_failed)
2047 htab = elf_x86_hash_table (info, I386_ELF_DATA);
2051 BFD_ASSERT (is_x86_elf (input_bfd, htab));
2053 symtab_hdr = &elf_symtab_hdr (input_bfd);
2054 sym_hashes = elf_sym_hashes (input_bfd);
2055 local_got_offsets = elf_local_got_offsets (input_bfd);
2056 local_tlsdesc_gotents = elf_x86_local_tlsdesc_gotent (input_bfd);
2057 /* We have to handle relocations in vxworks .tls_vars sections
2058 specially, because the dynamic loader is 'weird'. */
2059 is_vxworks_tls = (htab->is_vxworks
2060 && bfd_link_pic (info)
2061 && !strcmp (input_section->output_section->name,
2064 _bfd_x86_elf_set_tls_module_base (info);
2066 plt_entry_size = htab->plt.plt_entry_size;
2068 rel = wrel = relocs;
2069 relend = relocs + input_section->reloc_count;
2070 for (; rel < relend; wrel++, rel++)
2072 unsigned int r_type, r_type_tls;
2073 reloc_howto_type *howto;
2074 unsigned long r_symndx;
2075 struct elf_link_hash_entry *h;
2076 struct elf_x86_link_hash_entry *eh;
2077 Elf_Internal_Sym *sym;
2079 bfd_vma off, offplt, plt_offset;
2081 bfd_boolean unresolved_reloc;
2082 bfd_reloc_status_type r;
2086 asection *resolved_plt;
2087 bfd_boolean resolved_to_zero;
2088 bfd_boolean relative_reloc;
2090 r_type = ELF32_R_TYPE (rel->r_info);
2091 if (r_type == R_386_GNU_VTINHERIT
2092 || r_type == R_386_GNU_VTENTRY)
2099 if ((indx = r_type) >= R_386_standard
2100 && ((indx = r_type - R_386_ext_offset) - R_386_standard
2101 >= R_386_ext - R_386_standard)
2102 && ((indx = r_type - R_386_tls_offset) - R_386_ext
2103 >= R_386_ext2 - R_386_ext))
2104 return _bfd_unrecognized_reloc (input_bfd, input_section, r_type);
2106 howto = elf_howto_table + indx;
2108 r_symndx = ELF32_R_SYM (rel->r_info);
2112 unresolved_reloc = FALSE;
2113 if (r_symndx < symtab_hdr->sh_info)
2115 sym = local_syms + r_symndx;
2116 sec = local_sections[r_symndx];
2117 relocation = (sec->output_section->vma
2118 + sec->output_offset
2120 st_size = sym->st_size;
2122 if (ELF_ST_TYPE (sym->st_info) == STT_SECTION
2123 && ((sec->flags & SEC_MERGE) != 0
2124 || (bfd_link_relocatable (info)
2125 && sec->output_offset != 0)))
2128 bfd_byte *where = contents + rel->r_offset;
2130 switch (howto->size)
2133 addend = bfd_get_8 (input_bfd, where);
2134 if (howto->pc_relative)
2136 addend = (addend ^ 0x80) - 0x80;
2141 addend = bfd_get_16 (input_bfd, where);
2142 if (howto->pc_relative)
2144 addend = (addend ^ 0x8000) - 0x8000;
2149 addend = bfd_get_32 (input_bfd, where);
2150 if (howto->pc_relative)
2152 addend = (addend ^ 0x80000000) - 0x80000000;
2160 if (bfd_link_relocatable (info))
2161 addend += sec->output_offset;
2164 asection *msec = sec;
2165 addend = _bfd_elf_rel_local_sym (output_bfd, sym, &msec,
2167 addend -= relocation;
2168 addend += msec->output_section->vma + msec->output_offset;
2171 switch (howto->size)
2174 /* FIXME: overflow checks. */
2175 if (howto->pc_relative)
2177 bfd_put_8 (input_bfd, addend, where);
2180 if (howto->pc_relative)
2182 bfd_put_16 (input_bfd, addend, where);
2185 if (howto->pc_relative)
2187 bfd_put_32 (input_bfd, addend, where);
2191 else if (!bfd_link_relocatable (info)
2192 && ELF32_ST_TYPE (sym->st_info) == STT_GNU_IFUNC)
2194 /* Relocate against local STT_GNU_IFUNC symbol. */
2195 h = _bfd_elf_x86_get_local_sym_hash (htab, input_bfd, rel,
2200 /* Set STT_GNU_IFUNC symbol value. */
2201 h->root.u.def.value = sym->st_value;
2202 h->root.u.def.section = sec;
2207 bfd_boolean warned ATTRIBUTE_UNUSED;
2208 bfd_boolean ignored ATTRIBUTE_UNUSED;
2210 RELOC_FOR_GLOBAL_SYMBOL (info, input_bfd, input_section, rel,
2211 r_symndx, symtab_hdr, sym_hashes,
2213 unresolved_reloc, warned, ignored);
2217 if (sec != NULL && discarded_section (sec))
2219 _bfd_clear_contents (howto, input_bfd, input_section,
2220 contents + rel->r_offset);
2221 wrel->r_offset = rel->r_offset;
2225 /* For ld -r, remove relocations in debug sections against
2226 sections defined in discarded sections. Not done for
2227 eh_frame editing code expects to be present. */
2228 if (bfd_link_relocatable (info)
2229 && (input_section->flags & SEC_DEBUGGING))
2235 if (bfd_link_relocatable (info))
2242 eh = (struct elf_x86_link_hash_entry *) h;
2244 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2245 it here if it is defined in a non-shared object. */
2247 && h->type == STT_GNU_IFUNC
2250 asection *gotplt, *base_got;
2254 if ((input_section->flags & SEC_ALLOC) == 0)
2256 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2257 sections because such sections are not SEC_ALLOC and
2258 thus ld.so will not process them. */
2259 if ((input_section->flags & SEC_DEBUGGING) != 0)
2264 /* STT_GNU_IFUNC symbol must go through PLT. */
2265 if (htab->elf.splt != NULL)
2267 if (htab->plt_second != NULL)
2269 resolved_plt = htab->plt_second;
2270 plt_offset = eh->plt_second.offset;
2274 resolved_plt = htab->elf.splt;
2275 plt_offset = h->plt.offset;
2277 gotplt = htab->elf.sgotplt;
2281 resolved_plt = htab->elf.iplt;
2282 plt_offset = h->plt.offset;
2283 gotplt = htab->elf.igotplt;
2293 base_got = htab->elf.sgot;
2294 off = h->got.offset;
2296 if (base_got == NULL)
2299 if (off == (bfd_vma) -1)
2301 /* We can't use h->got.offset here to save state, or
2302 even just remember the offset, as finish_dynamic_symbol
2303 would use that as offset into .got. */
2305 if (h->plt.offset == (bfd_vma) -1)
2308 if (htab->elf.splt != NULL)
2310 plt_index = (h->plt.offset / plt_entry_size
2311 - htab->plt.has_plt0);
2312 off = (plt_index + 3) * 4;
2313 base_got = htab->elf.sgotplt;
2317 plt_index = h->plt.offset / plt_entry_size;
2318 off = plt_index * 4;
2319 base_got = htab->elf.igotplt;
2322 if (h->dynindx == -1
2326 /* This references the local defitionion. We must
2327 initialize this entry in the global offset table.
2328 Since the offset must always be a multiple of 8,
2329 we use the least significant bit to record
2330 whether we have initialized it already.
2332 When doing a dynamic link, we create a .rela.got
2333 relocation entry to initialize the value. This
2334 is done in the finish_dynamic_symbol routine. */
2339 bfd_put_32 (output_bfd, relocation,
2340 base_got->contents + off);
2348 relocation = (base_got->output_section->vma
2349 + base_got->output_offset + off
2350 - gotplt->output_section->vma
2351 - gotplt->output_offset);
2353 if (rel->r_offset > 1
2354 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2355 && *(contents + rel->r_offset - 2) != 0x8d)
2357 if (bfd_link_pic (info))
2358 goto disallow_got32;
2360 /* Add the GOT base if there is no base register. */
2361 relocation += (gotplt->output_section->vma
2362 + gotplt->output_offset);
2364 else if (htab->elf.splt == NULL)
2366 /* Adjust for static executables. */
2367 relocation += gotplt->output_offset;
2373 if (h->plt.offset == (bfd_vma) -1)
2375 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2376 if (r_type == R_386_32
2377 && (input_section->flags & SEC_CODE) == 0)
2378 goto do_ifunc_pointer;
2379 goto bad_ifunc_reloc;
2382 relocation = (resolved_plt->output_section->vma
2383 + resolved_plt->output_offset + plt_offset);
2389 if (h->root.root.string)
2390 name = h->root.root.string;
2392 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2395 /* xgettext:c-format */
2396 (_("%B: relocation %s against STT_GNU_IFUNC "
2397 "symbol `%s' isn't supported"), input_bfd,
2399 bfd_set_error (bfd_error_bad_value);
2403 /* Generate dynamic relcoation only when there is a
2404 non-GOT reference in a shared object. */
2405 if ((bfd_link_pic (info) && h->non_got_ref)
2406 || h->plt.offset == (bfd_vma) -1)
2408 Elf_Internal_Rela outrel;
2413 /* Need a dynamic relocation to get the real function
2415 offset = _bfd_elf_section_offset (output_bfd,
2419 if (offset == (bfd_vma) -1
2420 || offset == (bfd_vma) -2)
2423 outrel.r_offset = (input_section->output_section->vma
2424 + input_section->output_offset
2427 if (h->dynindx == -1
2429 || bfd_link_executable (info))
2431 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
2432 h->root.root.string,
2433 h->root.u.def.section->owner);
2435 /* This symbol is resolved locally. */
2436 outrel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
2437 bfd_put_32 (output_bfd,
2438 (h->root.u.def.value
2439 + h->root.u.def.section->output_section->vma
2440 + h->root.u.def.section->output_offset),
2444 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2446 /* Dynamic relocations are stored in
2447 1. .rel.ifunc section in PIC object.
2448 2. .rel.got section in dynamic executable.
2449 3. .rel.iplt section in static executable. */
2450 if (bfd_link_pic (info))
2451 sreloc = htab->elf.irelifunc;
2452 else if (htab->elf.splt != NULL)
2453 sreloc = htab->elf.srelgot;
2455 sreloc = htab->elf.irelplt;
2456 elf_append_rel (output_bfd, sreloc, &outrel);
2458 /* If this reloc is against an external symbol, we
2459 do not want to fiddle with the addend. Otherwise,
2460 we need to include the symbol value so that it
2461 becomes an addend for the dynamic reloc. For an
2462 internal symbol, we have updated addend. */
2471 relocation -= (gotplt->output_section->vma
2472 + gotplt->output_offset);
2477 resolved_to_zero = (eh != NULL
2478 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh));
2483 /* Avoid optimizing _DYNAMIC since ld.so may use its
2484 link-time address. */
2485 if (h == htab->elf.hdynamic)
2488 if (bfd_link_pic (info))
2490 /* It is OK to convert mov to lea and convert indirect
2491 branch to direct branch. It is OK to convert adc,
2492 add, and, cmp, or, sbb, sub, test, xor only when PIC
2494 unsigned int opcode, addend;
2495 addend = bfd_get_32 (input_bfd, contents + rel->r_offset);
2498 opcode = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
2499 if (opcode != 0x8b && opcode != 0xff)
2503 /* Resolve "mov GOT[(%reg)], %reg",
2504 "call/jmp *GOT[(%reg)]", "test %reg, foo@GOT[(%reg)]"
2505 and "binop foo@GOT[(%reg)], %reg". */
2507 || (h->plt.offset == (bfd_vma) -1
2508 && h->got.offset == (bfd_vma) -1)
2509 || htab->elf.sgotplt == NULL)
2512 offplt = (htab->elf.sgotplt->output_section->vma
2513 + htab->elf.sgotplt->output_offset);
2515 /* It is relative to .got.plt section. */
2516 if (h->got.offset != (bfd_vma) -1)
2517 /* Use GOT entry. Mask off the least significant bit in
2518 GOT offset which may be set by R_386_GOT32 processing
2520 relocation = (htab->elf.sgot->output_section->vma
2521 + htab->elf.sgot->output_offset
2522 + (h->got.offset & ~1) - offplt);
2524 /* Use GOTPLT entry. */
2525 relocation = (h->plt.offset / plt_entry_size
2526 - htab->plt.has_plt0 + 3) * 4;
2528 if (!bfd_link_pic (info))
2530 /* If not PIC, add the .got.plt section address for
2531 baseless addressing. */
2533 modrm = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
2534 if ((modrm & 0xc7) == 0x5)
2535 relocation += offplt;
2538 unresolved_reloc = FALSE;
2543 /* Relocation is to the entry for this symbol in the global
2545 if (htab->elf.sgot == NULL)
2548 relative_reloc = FALSE;
2553 off = h->got.offset;
2554 dyn = htab->elf.dynamic_sections_created;
2555 if (! WILL_CALL_FINISH_DYNAMIC_SYMBOL (dyn,
2556 bfd_link_pic (info),
2558 || (bfd_link_pic (info)
2559 && SYMBOL_REFERENCES_LOCAL_P (info, h))
2560 || (ELF_ST_VISIBILITY (h->other)
2561 && h->root.type == bfd_link_hash_undefweak))
2563 /* This is actually a static link, or it is a
2564 -Bsymbolic link and the symbol is defined
2565 locally, or the symbol was forced to be local
2566 because of a version file. We must initialize
2567 this entry in the global offset table. Since the
2568 offset must always be a multiple of 4, we use the
2569 least significant bit to record whether we have
2570 initialized it already.
2572 When doing a dynamic link, we create a .rel.got
2573 relocation entry to initialize the value. This
2574 is done in the finish_dynamic_symbol routine. */
2579 bfd_put_32 (output_bfd, relocation,
2580 htab->elf.sgot->contents + off);
2583 if (h->dynindx == -1
2585 && h->root.type != bfd_link_hash_undefweak
2586 && bfd_link_pic (info))
2588 /* PR ld/21402: If this symbol isn't dynamic
2589 in PIC, generate R_386_RELATIVE here. */
2590 eh->no_finish_dynamic_symbol = 1;
2591 relative_reloc = TRUE;
2596 unresolved_reloc = FALSE;
2600 if (local_got_offsets == NULL)
2603 off = local_got_offsets[r_symndx];
2605 /* The offset must always be a multiple of 4. We use
2606 the least significant bit to record whether we have
2607 already generated the necessary reloc. */
2612 bfd_put_32 (output_bfd, relocation,
2613 htab->elf.sgot->contents + off);
2614 local_got_offsets[r_symndx] |= 1;
2616 if (bfd_link_pic (info))
2617 relative_reloc = TRUE;
2624 Elf_Internal_Rela outrel;
2626 s = htab->elf.srelgot;
2630 outrel.r_offset = (htab->elf.sgot->output_section->vma
2631 + htab->elf.sgot->output_offset
2633 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2634 elf_append_rel (output_bfd, s, &outrel);
2637 if (off >= (bfd_vma) -2)
2640 relocation = (htab->elf.sgot->output_section->vma
2641 + htab->elf.sgot->output_offset + off);
2642 if (rel->r_offset > 1
2643 && (*(contents + rel->r_offset - 1) & 0xc7) == 0x5
2644 && *(contents + rel->r_offset - 2) != 0x8d)
2646 if (bfd_link_pic (info))
2648 /* For PIC, disallow R_386_GOT32 without a base
2649 register, except for "lea foo@GOT, %reg", since
2650 we don't know what the GOT base is. */
2654 if (h == NULL || h->root.root.string == NULL)
2655 name = bfd_elf_sym_name (input_bfd, symtab_hdr, sym,
2658 name = h->root.root.string;
2661 /* xgettext:c-format */
2662 (_("%B: direct GOT relocation %s against `%s'"
2663 " without base register can not be used"
2664 " when making a shared object"),
2665 input_bfd, howto->name, name);
2666 bfd_set_error (bfd_error_bad_value);
2672 /* Subtract the .got.plt section address only with a base
2674 relocation -= (htab->elf.sgotplt->output_section->vma
2675 + htab->elf.sgotplt->output_offset);
2681 /* Relocation is relative to the start of the global offset
2684 /* Check to make sure it isn't a protected function or data
2685 symbol for shared library since it may not be local when
2686 used as function address or with copy relocation. We also
2687 need to make sure that a symbol is referenced locally. */
2688 if (!bfd_link_executable (info) && h)
2690 if (!h->def_regular)
2694 switch (ELF_ST_VISIBILITY (h->other))
2697 v = _("hidden symbol");
2700 v = _("internal symbol");
2703 v = _("protected symbol");
2711 /* xgettext:c-format */
2712 (_("%B: relocation R_386_GOTOFF against undefined %s"
2713 " `%s' can not be used when making a shared object"),
2714 input_bfd, v, h->root.root.string);
2715 bfd_set_error (bfd_error_bad_value);
2718 else if (!SYMBOL_REFERENCES_LOCAL_P (info, h)
2719 && (h->type == STT_FUNC
2720 || h->type == STT_OBJECT)
2721 && ELF_ST_VISIBILITY (h->other) == STV_PROTECTED)
2724 /* xgettext:c-format */
2725 (_("%B: relocation R_386_GOTOFF against protected %s"
2726 " `%s' can not be used when making a shared object"),
2728 h->type == STT_FUNC ? "function" : "data",
2729 h->root.root.string);
2730 bfd_set_error (bfd_error_bad_value);
2735 /* Note that sgot is not involved in this
2736 calculation. We always want the start of .got.plt. If we
2737 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
2738 permitted by the ABI, we might have to change this
2740 relocation -= htab->elf.sgotplt->output_section->vma
2741 + htab->elf.sgotplt->output_offset;
2745 /* Use global offset table as symbol value. */
2746 relocation = htab->elf.sgotplt->output_section->vma
2747 + htab->elf.sgotplt->output_offset;
2748 unresolved_reloc = FALSE;
2752 /* Relocation is to the entry for this symbol in the
2753 procedure linkage table. */
2755 /* Resolve a PLT32 reloc against a local symbol directly,
2756 without using the procedure linkage table. */
2760 if ((h->plt.offset == (bfd_vma) -1
2761 && eh->plt_got.offset == (bfd_vma) -1)
2762 || htab->elf.splt == NULL)
2764 /* We didn't make a PLT entry for this symbol. This
2765 happens when statically linking PIC code, or when
2766 using -Bsymbolic. */
2770 if (h->plt.offset != (bfd_vma) -1)
2772 if (htab->plt_second != NULL)
2774 resolved_plt = htab->plt_second;
2775 plt_offset = eh->plt_second.offset;
2779 resolved_plt = htab->elf.splt;
2780 plt_offset = h->plt.offset;
2785 resolved_plt = htab->plt_got;
2786 plt_offset = eh->plt_got.offset;
2789 relocation = (resolved_plt->output_section->vma
2790 + resolved_plt->output_offset
2792 unresolved_reloc = FALSE;
2796 /* Set to symbol size. */
2797 relocation = st_size;
2802 if ((input_section->flags & SEC_ALLOC) == 0
2806 /* Copy dynamic function pointer relocations. Don't generate
2807 dynamic relocations against resolved undefined weak symbols
2808 in PIE, except for R_386_PC32. */
2809 if ((bfd_link_pic (info)
2811 || ((ELF_ST_VISIBILITY (h->other) == STV_DEFAULT
2812 && (!resolved_to_zero
2813 || r_type == R_386_PC32))
2814 || h->root.type != bfd_link_hash_undefweak))
2815 && ((r_type != R_386_PC32 && r_type != R_386_SIZE32)
2816 || !SYMBOL_CALLS_LOCAL (info, h)))
2817 || (ELIMINATE_COPY_RELOCS
2818 && !bfd_link_pic (info)
2822 || eh->func_pointer_refcount > 0
2823 || (h->root.type == bfd_link_hash_undefweak
2824 && !resolved_to_zero))
2825 && ((h->def_dynamic && !h->def_regular)
2826 /* Undefined weak symbol is bound locally when
2828 || h->root.type == bfd_link_hash_undefweak)))
2830 Elf_Internal_Rela outrel;
2831 bfd_boolean skip, relocate;
2834 /* When generating a shared object, these relocations
2835 are copied into the output file to be resolved at run
2842 _bfd_elf_section_offset (output_bfd, info, input_section,
2844 if (outrel.r_offset == (bfd_vma) -1)
2846 else if (outrel.r_offset == (bfd_vma) -2)
2847 skip = TRUE, relocate = TRUE;
2848 outrel.r_offset += (input_section->output_section->vma
2849 + input_section->output_offset);
2852 memset (&outrel, 0, sizeof outrel);
2855 && (r_type == R_386_PC32
2856 || !(bfd_link_executable (info)
2857 || SYMBOLIC_BIND (info, h))
2858 || !h->def_regular))
2859 outrel.r_info = ELF32_R_INFO (h->dynindx, r_type);
2862 /* This symbol is local, or marked to become local. */
2864 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2867 sreloc = elf_section_data (input_section)->sreloc;
2869 if (sreloc == NULL || sreloc->contents == NULL)
2871 r = bfd_reloc_notsupported;
2872 goto check_relocation_error;
2875 elf_append_rel (output_bfd, sreloc, &outrel);
2877 /* If this reloc is against an external symbol, we do
2878 not want to fiddle with the addend. Otherwise, we
2879 need to include the symbol value so that it becomes
2880 an addend for the dynamic reloc. */
2887 if (!bfd_link_executable (info))
2889 Elf_Internal_Rela outrel;
2892 outrel.r_offset = rel->r_offset
2893 + input_section->output_section->vma
2894 + input_section->output_offset;
2895 outrel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
2896 sreloc = elf_section_data (input_section)->sreloc;
2899 elf_append_rel (output_bfd, sreloc, &outrel);
2904 case R_386_TLS_GOTDESC:
2905 case R_386_TLS_DESC_CALL:
2906 case R_386_TLS_IE_32:
2907 case R_386_TLS_GOTIE:
2908 tls_type = GOT_UNKNOWN;
2909 if (h == NULL && local_got_offsets)
2910 tls_type = elf_x86_local_got_tls_type (input_bfd) [r_symndx];
2912 tls_type = elf_x86_hash_entry(h)->tls_type;
2913 if (tls_type == GOT_TLS_IE)
2914 tls_type = GOT_TLS_IE_NEG;
2916 r_type_tls = r_type;
2917 if (! elf_i386_tls_transition (info, input_bfd,
2918 input_section, contents,
2919 symtab_hdr, sym_hashes,
2920 &r_type_tls, tls_type, rel,
2921 relend, h, r_symndx, TRUE))
2924 if (r_type_tls == R_386_TLS_LE_32)
2926 BFD_ASSERT (! unresolved_reloc);
2927 if (r_type == R_386_TLS_GD)
2932 /* GD->LE transition. */
2933 type = *(contents + rel->r_offset - 2);
2937 leal foo@tlsgd(,%ebx,1), %eax
2938 call ___tls_get_addr@PLT
2941 subl $foo@tpoff, %eax
2942 (6 byte form of subl). */
2943 roff = rel->r_offset + 5;
2948 leal foo@tlsgd(%ebx), %eax
2949 call ___tls_get_addr@PLT
2952 leal foo@tlsgd(%reg), %eax
2953 call *___tls_get_addr@GOT(%reg)
2954 which may be converted to
2955 addr32 call ___tls_get_addr
2957 movl %gs:0, %eax; subl $foo@tpoff, %eax
2958 (6 byte form of subl). */
2959 roff = rel->r_offset + 6;
2961 memcpy (contents + roff - 8,
2962 "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2963 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
2965 /* Skip R_386_PC32, R_386_PLT32 and R_386_GOT32X. */
2970 else if (r_type == R_386_TLS_GOTDESC)
2972 /* GDesc -> LE transition.
2973 It's originally something like:
2974 leal x@tlsdesc(%ebx), %eax
2978 Registers other than %eax may be set up here. */
2983 roff = rel->r_offset;
2984 val = bfd_get_8 (input_bfd, contents + roff - 1);
2986 /* Now modify the instruction as appropriate. */
2987 /* aoliva FIXME: remove the above and xor the byte
2989 bfd_put_8 (output_bfd, val ^ 0x86,
2990 contents + roff - 1);
2991 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
2995 else if (r_type == R_386_TLS_DESC_CALL)
2997 /* GDesc -> LE transition.
3005 roff = rel->r_offset;
3006 bfd_put_8 (output_bfd, 0x66, contents + roff);
3007 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3010 else if (r_type == R_386_TLS_IE)
3014 /* IE->LE transition:
3015 Originally it can be one of:
3023 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3026 /* movl foo, %eax. */
3027 bfd_put_8 (output_bfd, 0xb8,
3028 contents + rel->r_offset - 1);
3034 type = bfd_get_8 (input_bfd,
3035 contents + rel->r_offset - 2);
3040 bfd_put_8 (output_bfd, 0xc7,
3041 contents + rel->r_offset - 2);
3042 bfd_put_8 (output_bfd,
3043 0xc0 | ((val >> 3) & 7),
3044 contents + rel->r_offset - 1);
3048 bfd_put_8 (output_bfd, 0x81,
3049 contents + rel->r_offset - 2);
3050 bfd_put_8 (output_bfd,
3051 0xc0 | ((val >> 3) & 7),
3052 contents + rel->r_offset - 1);
3059 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3060 contents + rel->r_offset);
3065 unsigned int val, type;
3067 /* {IE_32,GOTIE}->LE transition:
3068 Originally it can be one of:
3069 subl foo(%reg1), %reg2
3070 movl foo(%reg1), %reg2
3071 addl foo(%reg1), %reg2
3074 movl $foo, %reg2 (6 byte form)
3075 addl $foo, %reg2. */
3076 type = bfd_get_8 (input_bfd, contents + rel->r_offset - 2);
3077 val = bfd_get_8 (input_bfd, contents + rel->r_offset - 1);
3081 bfd_put_8 (output_bfd, 0xc7,
3082 contents + rel->r_offset - 2);
3083 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3084 contents + rel->r_offset - 1);
3086 else if (type == 0x2b)
3089 bfd_put_8 (output_bfd, 0x81,
3090 contents + rel->r_offset - 2);
3091 bfd_put_8 (output_bfd, 0xe8 | ((val >> 3) & 7),
3092 contents + rel->r_offset - 1);
3094 else if (type == 0x03)
3097 bfd_put_8 (output_bfd, 0x81,
3098 contents + rel->r_offset - 2);
3099 bfd_put_8 (output_bfd, 0xc0 | ((val >> 3) & 7),
3100 contents + rel->r_offset - 1);
3104 if (r_type == R_386_TLS_GOTIE)
3105 bfd_put_32 (output_bfd, -elf_i386_tpoff (info, relocation),
3106 contents + rel->r_offset);
3108 bfd_put_32 (output_bfd, elf_i386_tpoff (info, relocation),
3109 contents + rel->r_offset);
3114 if (htab->elf.sgot == NULL)
3119 off = h->got.offset;
3120 offplt = elf_x86_hash_entry (h)->tlsdesc_got;
3124 if (local_got_offsets == NULL)
3127 off = local_got_offsets[r_symndx];
3128 offplt = local_tlsdesc_gotents[r_symndx];
3135 Elf_Internal_Rela outrel;
3139 if (htab->elf.srelgot == NULL)
3142 indx = h && h->dynindx != -1 ? h->dynindx : 0;
3144 if (GOT_TLS_GDESC_P (tls_type))
3147 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_DESC);
3148 BFD_ASSERT (htab->sgotplt_jump_table_size + offplt + 8
3149 <= htab->elf.sgotplt->size);
3150 outrel.r_offset = (htab->elf.sgotplt->output_section->vma
3151 + htab->elf.sgotplt->output_offset
3153 + htab->sgotplt_jump_table_size);
3154 sreloc = htab->elf.srelplt;
3155 loc = sreloc->contents;
3156 loc += (htab->next_tls_desc_index++
3157 * sizeof (Elf32_External_Rel));
3158 BFD_ASSERT (loc + sizeof (Elf32_External_Rel)
3159 <= sreloc->contents + sreloc->size);
3160 bfd_elf32_swap_reloc_out (output_bfd, &outrel, loc);
3163 BFD_ASSERT (! unresolved_reloc);
3164 bfd_put_32 (output_bfd,
3165 relocation - _bfd_x86_elf_dtpoff_base (info),
3166 htab->elf.sgotplt->contents + offplt
3167 + htab->sgotplt_jump_table_size + 4);
3171 bfd_put_32 (output_bfd, 0,
3172 htab->elf.sgotplt->contents + offplt
3173 + htab->sgotplt_jump_table_size + 4);
3177 sreloc = htab->elf.srelgot;
3179 outrel.r_offset = (htab->elf.sgot->output_section->vma
3180 + htab->elf.sgot->output_offset + off);
3182 if (GOT_TLS_GD_P (tls_type))
3183 dr_type = R_386_TLS_DTPMOD32;
3184 else if (GOT_TLS_GDESC_P (tls_type))
3186 else if (tls_type == GOT_TLS_IE_POS)
3187 dr_type = R_386_TLS_TPOFF;
3189 dr_type = R_386_TLS_TPOFF32;
3191 if (dr_type == R_386_TLS_TPOFF && indx == 0)
3192 bfd_put_32 (output_bfd,
3193 relocation - _bfd_x86_elf_dtpoff_base (info),
3194 htab->elf.sgot->contents + off);
3195 else if (dr_type == R_386_TLS_TPOFF32 && indx == 0)
3196 bfd_put_32 (output_bfd,
3197 _bfd_x86_elf_dtpoff_base (info) - relocation,
3198 htab->elf.sgot->contents + off);
3199 else if (dr_type != R_386_TLS_DESC)
3200 bfd_put_32 (output_bfd, 0,
3201 htab->elf.sgot->contents + off);
3202 outrel.r_info = ELF32_R_INFO (indx, dr_type);
3204 elf_append_rel (output_bfd, sreloc, &outrel);
3206 if (GOT_TLS_GD_P (tls_type))
3210 BFD_ASSERT (! unresolved_reloc);
3211 bfd_put_32 (output_bfd,
3212 relocation - _bfd_x86_elf_dtpoff_base (info),
3213 htab->elf.sgot->contents + off + 4);
3217 bfd_put_32 (output_bfd, 0,
3218 htab->elf.sgot->contents + off + 4);
3219 outrel.r_info = ELF32_R_INFO (indx,
3220 R_386_TLS_DTPOFF32);
3221 outrel.r_offset += 4;
3222 elf_append_rel (output_bfd, sreloc, &outrel);
3225 else if (tls_type == GOT_TLS_IE_BOTH)
3227 bfd_put_32 (output_bfd,
3229 ? relocation - _bfd_x86_elf_dtpoff_base (info)
3231 htab->elf.sgot->contents + off + 4);
3232 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3233 outrel.r_offset += 4;
3234 elf_append_rel (output_bfd, sreloc, &outrel);
3241 local_got_offsets[r_symndx] |= 1;
3244 if (off >= (bfd_vma) -2
3245 && ! GOT_TLS_GDESC_P (tls_type))
3247 if (r_type_tls == R_386_TLS_GOTDESC
3248 || r_type_tls == R_386_TLS_DESC_CALL)
3250 relocation = htab->sgotplt_jump_table_size + offplt;
3251 unresolved_reloc = FALSE;
3253 else if (r_type_tls == r_type)
3255 bfd_vma g_o_t = htab->elf.sgotplt->output_section->vma
3256 + htab->elf.sgotplt->output_offset;
3257 relocation = htab->elf.sgot->output_section->vma
3258 + htab->elf.sgot->output_offset + off - g_o_t;
3259 if ((r_type == R_386_TLS_IE || r_type == R_386_TLS_GOTIE)
3260 && tls_type == GOT_TLS_IE_BOTH)
3262 if (r_type == R_386_TLS_IE)
3263 relocation += g_o_t;
3264 unresolved_reloc = FALSE;
3266 else if (r_type == R_386_TLS_GD)
3268 unsigned int val, type;
3271 /* GD->IE transition. */
3272 type = *(contents + rel->r_offset - 2);
3273 val = *(contents + rel->r_offset - 1);
3277 leal foo@tlsgd(,%ebx,1), %eax
3278 call ___tls_get_addr@PLT
3281 subl $foo@gottpoff(%ebx), %eax. */
3283 roff = rel->r_offset - 3;
3288 leal foo@tlsgd(%ebx), %eax
3289 call ___tls_get_addr@PLT
3292 leal foo@tlsgd(%reg), %eax
3293 call *___tls_get_addr@GOT(%reg)
3294 which may be converted to
3295 addr32 call ___tls_get_addr
3298 subl $foo@gottpoff(%reg), %eax. */
3299 roff = rel->r_offset - 2;
3301 memcpy (contents + roff,
3302 "\x65\xa1\0\0\0\0\x2b\x80\0\0\0", 12);
3303 contents[roff + 7] = 0x80 | (val & 7);
3304 /* If foo is used only with foo@gotntpoff(%reg) and
3305 foo@indntpoff, but not with foo@gottpoff(%reg), change
3306 subl $foo@gottpoff(%reg), %eax
3308 addl $foo@gotntpoff(%reg), %eax. */
3309 if (tls_type == GOT_TLS_IE_POS)
3310 contents[roff + 6] = 0x03;
3311 bfd_put_32 (output_bfd,
3312 htab->elf.sgot->output_section->vma
3313 + htab->elf.sgot->output_offset + off
3314 - htab->elf.sgotplt->output_section->vma
3315 - htab->elf.sgotplt->output_offset,
3316 contents + roff + 8);
3317 /* Skip R_386_PLT32 and R_386_GOT32X. */
3322 else if (r_type == R_386_TLS_GOTDESC)
3324 /* GDesc -> IE transition.
3325 It's originally something like:
3326 leal x@tlsdesc(%ebx), %eax
3329 movl x@gotntpoff(%ebx), %eax # before xchg %ax,%ax
3331 movl x@gottpoff(%ebx), %eax # before negl %eax
3333 Registers other than %eax may be set up here. */
3337 /* First, make sure it's a leal adding ebx to a 32-bit
3338 offset into any register, although it's probably
3339 almost always going to be eax. */
3340 roff = rel->r_offset;
3342 /* Now modify the instruction as appropriate. */
3343 /* To turn a leal into a movl in the form we use it, it
3344 suffices to change the first byte from 0x8d to 0x8b.
3345 aoliva FIXME: should we decide to keep the leal, all
3346 we have to do is remove the statement below, and
3347 adjust the relaxation of R_386_TLS_DESC_CALL. */
3348 bfd_put_8 (output_bfd, 0x8b, contents + roff - 2);
3350 if (tls_type == GOT_TLS_IE_BOTH)
3353 bfd_put_32 (output_bfd,
3354 htab->elf.sgot->output_section->vma
3355 + htab->elf.sgot->output_offset + off
3356 - htab->elf.sgotplt->output_section->vma
3357 - htab->elf.sgotplt->output_offset,
3361 else if (r_type == R_386_TLS_DESC_CALL)
3363 /* GDesc -> IE transition.
3371 depending on how we transformed the TLS_GOTDESC above.
3376 roff = rel->r_offset;
3378 /* Now modify the instruction as appropriate. */
3379 if (tls_type != GOT_TLS_IE_NEG)
3382 bfd_put_8 (output_bfd, 0x66, contents + roff);
3383 bfd_put_8 (output_bfd, 0x90, contents + roff + 1);
3388 bfd_put_8 (output_bfd, 0xf7, contents + roff);
3389 bfd_put_8 (output_bfd, 0xd8, contents + roff + 1);
3399 if (! elf_i386_tls_transition (info, input_bfd,
3400 input_section, contents,
3401 symtab_hdr, sym_hashes,
3402 &r_type, GOT_UNKNOWN, rel,
3403 relend, h, r_symndx, TRUE))
3406 if (r_type != R_386_TLS_LDM)
3408 /* LD->LE transition. Change
3409 leal foo@tlsldm(%ebx) %eax
3410 call ___tls_get_addr@PLT
3414 leal 0(%esi,1), %esi
3416 leal foo@tlsldm(%reg) %eax
3417 call *___tls_get_addr@GOT(%reg)
3418 which may be converted to
3419 addr32 call ___tls_get_addr
3422 leal 0(%esi), %esi */
3423 BFD_ASSERT (r_type == R_386_TLS_LE_32);
3424 if (*(contents + rel->r_offset + 4) == 0xff
3425 || *(contents + rel->r_offset + 4) == 0x67)
3426 memcpy (contents + rel->r_offset - 2,
3427 "\x65\xa1\0\0\0\0\x8d\xb6\0\0\0", 12);
3429 memcpy (contents + rel->r_offset - 2,
3430 "\x65\xa1\0\0\0\0\x90\x8d\x74\x26", 11);
3431 /* Skip R_386_PC32/R_386_PLT32. */
3437 if (htab->elf.sgot == NULL)
3440 off = htab->tls_ld_or_ldm_got.offset;
3445 Elf_Internal_Rela outrel;
3447 if (htab->elf.srelgot == NULL)
3450 outrel.r_offset = (htab->elf.sgot->output_section->vma
3451 + htab->elf.sgot->output_offset + off);
3453 bfd_put_32 (output_bfd, 0,
3454 htab->elf.sgot->contents + off);
3455 bfd_put_32 (output_bfd, 0,
3456 htab->elf.sgot->contents + off + 4);
3457 outrel.r_info = ELF32_R_INFO (0, R_386_TLS_DTPMOD32);
3458 elf_append_rel (output_bfd, htab->elf.srelgot, &outrel);
3459 htab->tls_ld_or_ldm_got.offset |= 1;
3461 relocation = htab->elf.sgot->output_section->vma
3462 + htab->elf.sgot->output_offset + off
3463 - htab->elf.sgotplt->output_section->vma
3464 - htab->elf.sgotplt->output_offset;
3465 unresolved_reloc = FALSE;
3468 case R_386_TLS_LDO_32:
3469 if (!bfd_link_executable (info)
3470 || (input_section->flags & SEC_CODE) == 0)
3471 relocation -= _bfd_x86_elf_dtpoff_base (info);
3473 /* When converting LDO to LE, we must negate. */
3474 relocation = -elf_i386_tpoff (info, relocation);
3477 case R_386_TLS_LE_32:
3479 if (!bfd_link_executable (info))
3481 Elf_Internal_Rela outrel;
3484 outrel.r_offset = rel->r_offset
3485 + input_section->output_section->vma
3486 + input_section->output_offset;
3487 if (h != NULL && h->dynindx != -1)
3491 if (r_type == R_386_TLS_LE_32)
3492 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF32);
3494 outrel.r_info = ELF32_R_INFO (indx, R_386_TLS_TPOFF);
3495 sreloc = elf_section_data (input_section)->sreloc;
3498 elf_append_rel (output_bfd, sreloc, &outrel);
3501 else if (r_type == R_386_TLS_LE_32)
3502 relocation = _bfd_x86_elf_dtpoff_base (info) - relocation;
3504 relocation -= _bfd_x86_elf_dtpoff_base (info);
3506 else if (r_type == R_386_TLS_LE_32)
3507 relocation = elf_i386_tpoff (info, relocation);
3509 relocation = -elf_i386_tpoff (info, relocation);
3516 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
3517 because such sections are not SEC_ALLOC and thus ld.so will
3518 not process them. */
3519 if (unresolved_reloc
3520 && !((input_section->flags & SEC_DEBUGGING) != 0
3522 && _bfd_elf_section_offset (output_bfd, info, input_section,
3523 rel->r_offset) != (bfd_vma) -1)
3526 /* xgettext:c-format */
3527 (_("%B(%A+%#Lx): unresolvable %s relocation against symbol `%s'"),
3532 h->root.root.string);
3537 r = _bfd_final_link_relocate (howto, input_bfd, input_section,
3538 contents, rel->r_offset,
3541 check_relocation_error:
3542 if (r != bfd_reloc_ok)
3547 name = h->root.root.string;
3550 name = bfd_elf_string_from_elf_section (input_bfd,
3551 symtab_hdr->sh_link,
3556 name = bfd_section_name (input_bfd, sec);
3559 if (r == bfd_reloc_overflow)
3560 (*info->callbacks->reloc_overflow)
3561 (info, (h ? &h->root : NULL), name, howto->name,
3562 (bfd_vma) 0, input_bfd, input_section, rel->r_offset);
3566 /* xgettext:c-format */
3567 (_("%B(%A+%#Lx): reloc against `%s': error %d"),
3568 input_bfd, input_section,
3569 rel->r_offset, name, (int) r);
3580 Elf_Internal_Shdr *rel_hdr;
3581 size_t deleted = rel - wrel;
3583 rel_hdr = _bfd_elf_single_rel_hdr (input_section->output_section);
3584 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3585 if (rel_hdr->sh_size == 0)
3587 /* It is too late to remove an empty reloc section. Leave
3589 ??? What is wrong with an empty section??? */
3590 rel_hdr->sh_size = rel_hdr->sh_entsize;
3593 rel_hdr = _bfd_elf_single_rel_hdr (input_section);
3594 rel_hdr->sh_size -= rel_hdr->sh_entsize * deleted;
3595 input_section->reloc_count -= deleted;
3601 /* Finish up dynamic symbol handling. We set the contents of various
3602 dynamic sections here. */
3605 elf_i386_finish_dynamic_symbol (bfd *output_bfd,
3606 struct bfd_link_info *info,
3607 struct elf_link_hash_entry *h,
3608 Elf_Internal_Sym *sym)
3610 struct elf_x86_link_hash_table *htab;
3611 unsigned plt_entry_size;
3612 struct elf_x86_link_hash_entry *eh;
3613 bfd_boolean local_undefweak;
3614 bfd_boolean use_plt_second;
3616 htab = elf_x86_hash_table (info, I386_ELF_DATA);
3620 plt_entry_size = htab->plt.plt_entry_size;
3622 /* Use the second PLT section only if there is .plt section. */
3623 use_plt_second = htab->elf.splt != NULL && htab->plt_second != NULL;
3625 eh = (struct elf_x86_link_hash_entry *) h;
3626 if (eh->no_finish_dynamic_symbol)
3629 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
3630 resolved undefined weak symbols in executable so that their
3631 references have value 0 at run-time. */
3632 local_undefweak = UNDEFINED_WEAK_RESOLVED_TO_ZERO (info, eh);
3634 if (h->plt.offset != (bfd_vma) -1)
3636 bfd_vma plt_index, plt_offset;
3638 Elf_Internal_Rela rel;
3640 asection *plt, *resolved_plt, *gotplt, *relplt;
3642 /* When building a static executable, use .iplt, .igot.plt and
3643 .rel.iplt sections for STT_GNU_IFUNC symbols. */
3644 if (htab->elf.splt != NULL)
3646 plt = htab->elf.splt;
3647 gotplt = htab->elf.sgotplt;
3648 relplt = htab->elf.srelplt;
3652 plt = htab->elf.iplt;
3653 gotplt = htab->elf.igotplt;
3654 relplt = htab->elf.irelplt;
3657 /* This symbol has an entry in the procedure linkage table. Set
3660 if ((h->dynindx == -1
3662 && !((h->forced_local || bfd_link_executable (info))
3664 && h->type == STT_GNU_IFUNC))
3670 /* Get the index in the procedure linkage table which
3671 corresponds to this symbol. This is the index of this symbol
3672 in all the symbols for which we are making plt entries. The
3673 first entry in the procedure linkage table is reserved.
3675 Get the offset into the .got table of the entry that
3676 corresponds to this function. Each .got entry is 4 bytes.
3677 The first three are reserved.
3679 For static executables, we don't reserve anything. */
3681 if (plt == htab->elf.splt)
3683 got_offset = (h->plt.offset / plt_entry_size
3684 - htab->plt.has_plt0);
3685 got_offset = (got_offset + 3) * 4;
3689 got_offset = h->plt.offset / plt_entry_size;
3690 got_offset = got_offset * 4;
3693 /* Fill in the entry in the procedure linkage table and update
3695 memcpy (plt->contents + h->plt.offset, htab->plt.plt_entry,
3700 const bfd_byte *plt_entry;
3701 if (bfd_link_pic (info))
3702 plt_entry = htab->non_lazy_plt->pic_plt_entry;
3704 plt_entry = htab->non_lazy_plt->plt_entry;
3705 memcpy (htab->plt_second->contents + eh->plt_second.offset,
3706 plt_entry, htab->non_lazy_plt->plt_entry_size);
3708 resolved_plt = htab->plt_second;
3709 plt_offset = eh->plt_second.offset;
3714 plt_offset = h->plt.offset;
3717 if (! bfd_link_pic (info))
3719 bfd_put_32 (output_bfd,
3720 (gotplt->output_section->vma
3721 + gotplt->output_offset
3723 resolved_plt->contents + plt_offset
3724 + htab->plt.plt_got_offset);
3726 if (htab->is_vxworks)
3728 int s, k, reloc_index;
3730 /* Create the R_386_32 relocation referencing the GOT
3731 for this PLT entry. */
3733 /* S: Current slot number (zero-based). */
3734 s = ((h->plt.offset - htab->plt.plt_entry_size)
3735 / htab->plt.plt_entry_size);
3736 /* K: Number of relocations for PLTResolve. */
3737 if (bfd_link_pic (info))
3738 k = PLTRESOLVE_RELOCS_SHLIB;
3740 k = PLTRESOLVE_RELOCS;
3741 /* Skip the PLTresolve relocations, and the relocations for
3742 the other PLT slots. */
3743 reloc_index = k + s * PLT_NON_JUMP_SLOT_RELOCS;
3744 loc = (htab->srelplt2->contents + reloc_index
3745 * sizeof (Elf32_External_Rel));
3747 rel.r_offset = (plt->output_section->vma
3748 + plt->output_offset
3749 + h->plt.offset + 2),
3750 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx, R_386_32);
3751 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3753 /* Create the R_386_32 relocation referencing the beginning of
3754 the PLT for this GOT entry. */
3755 rel.r_offset = (htab->elf.sgotplt->output_section->vma
3756 + htab->elf.sgotplt->output_offset
3758 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx, R_386_32);
3759 bfd_elf32_swap_reloc_out (output_bfd, &rel,
3760 loc + sizeof (Elf32_External_Rel));
3765 bfd_put_32 (output_bfd, got_offset,
3766 resolved_plt->contents + plt_offset
3767 + htab->plt.plt_got_offset);
3770 /* Fill in the entry in the global offset table. Leave the entry
3771 as zero for undefined weak symbol in PIE. No PLT relocation
3772 against undefined weak symbol in PIE. */
3773 if (!local_undefweak)
3775 if (htab->plt.has_plt0)
3776 bfd_put_32 (output_bfd,
3777 (plt->output_section->vma
3778 + plt->output_offset
3780 + htab->lazy_plt->plt_lazy_offset),
3781 gotplt->contents + got_offset);
3783 /* Fill in the entry in the .rel.plt section. */
3784 rel.r_offset = (gotplt->output_section->vma
3785 + gotplt->output_offset
3787 if (h->dynindx == -1
3788 || ((bfd_link_executable (info)
3789 || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT)
3791 && h->type == STT_GNU_IFUNC))
3793 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3794 h->root.root.string,
3795 h->root.u.def.section->owner);
3797 /* If an STT_GNU_IFUNC symbol is locally defined, generate
3798 R_386_IRELATIVE instead of R_386_JUMP_SLOT. Store addend
3799 in the .got.plt section. */
3800 bfd_put_32 (output_bfd,
3801 (h->root.u.def.value
3802 + h->root.u.def.section->output_section->vma
3803 + h->root.u.def.section->output_offset),
3804 gotplt->contents + got_offset);
3805 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3806 /* R_386_IRELATIVE comes last. */
3807 plt_index = htab->next_irelative_index--;
3811 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_JUMP_SLOT);
3812 plt_index = htab->next_jump_slot_index++;
3815 loc = relplt->contents + plt_index * sizeof (Elf32_External_Rel);
3816 bfd_elf32_swap_reloc_out (output_bfd, &rel, loc);
3818 /* Don't fill the second and third slots in PLT entry for
3819 static executables nor without PLT0. */
3820 if (plt == htab->elf.splt && htab->plt.has_plt0)
3822 bfd_put_32 (output_bfd,
3823 plt_index * sizeof (Elf32_External_Rel),
3824 plt->contents + h->plt.offset
3825 + htab->lazy_plt->plt_reloc_offset);
3826 bfd_put_32 (output_bfd,
3828 + htab->lazy_plt->plt_plt_offset + 4),
3829 (plt->contents + h->plt.offset
3830 + htab->lazy_plt->plt_plt_offset));
3834 else if (eh->plt_got.offset != (bfd_vma) -1)
3836 bfd_vma got_offset, plt_offset;
3837 asection *plt, *got, *gotplt;
3838 const bfd_byte *got_plt_entry;
3840 /* Set the entry in the GOT procedure linkage table. */
3841 plt = htab->plt_got;
3842 got = htab->elf.sgot;
3843 gotplt = htab->elf.sgotplt;
3844 got_offset = h->got.offset;
3846 if (got_offset == (bfd_vma) -1
3852 /* Fill in the entry in the GOT procedure linkage table. */
3853 if (! bfd_link_pic (info))
3855 got_plt_entry = htab->non_lazy_plt->plt_entry;
3856 got_offset += got->output_section->vma + got->output_offset;
3860 got_plt_entry = htab->non_lazy_plt->pic_plt_entry;
3861 got_offset += (got->output_section->vma
3862 + got->output_offset
3863 - gotplt->output_section->vma
3864 - gotplt->output_offset);
3867 plt_offset = eh->plt_got.offset;
3868 memcpy (plt->contents + plt_offset, got_plt_entry,
3869 htab->non_lazy_plt->plt_entry_size);
3870 bfd_put_32 (output_bfd, got_offset,
3871 (plt->contents + plt_offset
3872 + htab->non_lazy_plt->plt_got_offset));
3875 if (!local_undefweak
3877 && (h->plt.offset != (bfd_vma) -1
3878 || eh->plt_got.offset != (bfd_vma) -1))
3880 /* Mark the symbol as undefined, rather than as defined in
3881 the .plt section. Leave the value if there were any
3882 relocations where pointer equality matters (this is a clue
3883 for the dynamic linker, to make function pointer
3884 comparisons work between an application and shared
3885 library), otherwise set it to zero. If a function is only
3886 called from a binary, there is no need to slow down
3887 shared libraries because of that. */
3888 sym->st_shndx = SHN_UNDEF;
3889 if (!h->pointer_equality_needed)
3893 /* Don't generate dynamic GOT relocation against undefined weak
3894 symbol in executable. */
3895 if (h->got.offset != (bfd_vma) -1
3896 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry(h)->tls_type)
3897 && (elf_x86_hash_entry(h)->tls_type & GOT_TLS_IE) == 0
3898 && !local_undefweak)
3900 Elf_Internal_Rela rel;
3901 asection *relgot = htab->elf.srelgot;
3903 /* This symbol has an entry in the global offset table. Set it
3906 if (htab->elf.sgot == NULL || htab->elf.srelgot == NULL)
3909 rel.r_offset = (htab->elf.sgot->output_section->vma
3910 + htab->elf.sgot->output_offset
3911 + (h->got.offset & ~(bfd_vma) 1));
3913 /* If this is a static link, or it is a -Bsymbolic link and the
3914 symbol is defined locally or was forced to be local because
3915 of a version file, we just want to emit a RELATIVE reloc.
3916 The entry in the global offset table will already have been
3917 initialized in the relocate_section function. */
3919 && h->type == STT_GNU_IFUNC)
3921 if (h->plt.offset == (bfd_vma) -1)
3923 /* STT_GNU_IFUNC is referenced without PLT. */
3924 if (htab->elf.splt == NULL)
3926 /* use .rel[a].iplt section to store .got relocations
3927 in static executable. */
3928 relgot = htab->elf.irelplt;
3930 if (SYMBOL_REFERENCES_LOCAL_P (info, h))
3932 info->callbacks->minfo (_("Local IFUNC function `%s' in %B\n"),
3933 h->root.root.string,
3934 h->root.u.def.section->owner);
3936 bfd_put_32 (output_bfd,
3937 (h->root.u.def.value
3938 + h->root.u.def.section->output_section->vma
3939 + h->root.u.def.section->output_offset),
3940 htab->elf.sgot->contents + h->got.offset);
3941 rel.r_info = ELF32_R_INFO (0, R_386_IRELATIVE);
3946 else if (bfd_link_pic (info))
3948 /* Generate R_386_GLOB_DAT. */
3956 if (!h->pointer_equality_needed)
3959 /* For non-shared object, we can't use .got.plt, which
3960 contains the real function addres if we need pointer
3961 equality. We load the GOT entry with the PLT entry. */
3962 if (htab->plt_second != NULL)
3964 plt = htab->plt_second;
3965 plt_offset = eh->plt_second.offset;
3969 plt = htab->elf.splt ? htab->elf.splt : htab->elf.iplt;
3970 plt_offset = h->plt.offset;
3972 bfd_put_32 (output_bfd,
3973 (plt->output_section->vma
3974 + plt->output_offset + plt_offset),
3975 htab->elf.sgot->contents + h->got.offset);
3979 else if (bfd_link_pic (info)
3980 && SYMBOL_REFERENCES_LOCAL_P (info, h))
3982 BFD_ASSERT((h->got.offset & 1) != 0);
3983 rel.r_info = ELF32_R_INFO (0, R_386_RELATIVE);
3987 BFD_ASSERT((h->got.offset & 1) == 0);
3989 bfd_put_32 (output_bfd, (bfd_vma) 0,
3990 htab->elf.sgot->contents + h->got.offset);
3991 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_GLOB_DAT);
3994 elf_append_rel (output_bfd, relgot, &rel);
3999 Elf_Internal_Rela rel;
4002 /* This symbol needs a copy reloc. Set it up. */
4004 if (h->dynindx == -1
4005 || (h->root.type != bfd_link_hash_defined
4006 && h->root.type != bfd_link_hash_defweak)
4007 || htab->elf.srelbss == NULL
4008 || htab->elf.sreldynrelro == NULL)
4011 rel.r_offset = (h->root.u.def.value
4012 + h->root.u.def.section->output_section->vma
4013 + h->root.u.def.section->output_offset);
4014 rel.r_info = ELF32_R_INFO (h->dynindx, R_386_COPY);
4015 if (h->root.u.def.section == htab->elf.sdynrelro)
4016 s = htab->elf.sreldynrelro;
4018 s = htab->elf.srelbss;
4019 elf_append_rel (output_bfd, s, &rel);
4025 /* Finish up local dynamic symbol handling. We set the contents of
4026 various dynamic sections here. */
4029 elf_i386_finish_local_dynamic_symbol (void **slot, void *inf)
4031 struct elf_link_hash_entry *h
4032 = (struct elf_link_hash_entry *) *slot;
4033 struct bfd_link_info *info
4034 = (struct bfd_link_info *) inf;
4036 return elf_i386_finish_dynamic_symbol (info->output_bfd, info,
4040 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4041 here since undefined weak symbol may not be dynamic and may not be
4042 called for elf_i386_finish_dynamic_symbol. */
4045 elf_i386_pie_finish_undefweak_symbol (struct bfd_hash_entry *bh,
4048 struct elf_link_hash_entry *h = (struct elf_link_hash_entry *) bh;
4049 struct bfd_link_info *info = (struct bfd_link_info *) inf;
4051 if (h->root.type != bfd_link_hash_undefweak
4052 || h->dynindx != -1)
4055 return elf_i386_finish_dynamic_symbol (info->output_bfd,
4059 /* Used to decide how to sort relocs in an optimal manner for the
4060 dynamic linker, before writing them out. */
4062 static enum elf_reloc_type_class
4063 elf_i386_reloc_type_class (const struct bfd_link_info *info,
4064 const asection *rel_sec ATTRIBUTE_UNUSED,
4065 const Elf_Internal_Rela *rela)
4067 bfd *abfd = info->output_bfd;
4068 const struct elf_backend_data *bed = get_elf_backend_data (abfd);
4069 struct elf_link_hash_table *htab = elf_hash_table (info);
4071 if (htab->dynsym != NULL
4072 && htab->dynsym->contents != NULL)
4074 /* Check relocation against STT_GNU_IFUNC symbol if there are
4076 unsigned long r_symndx = ELF32_R_SYM (rela->r_info);
4077 if (r_symndx != STN_UNDEF)
4079 Elf_Internal_Sym sym;
4080 if (!bed->s->swap_symbol_in (abfd,
4081 (htab->dynsym->contents
4082 + r_symndx * sizeof (Elf32_External_Sym)),
4086 if (ELF32_ST_TYPE (sym.st_info) == STT_GNU_IFUNC)
4087 return reloc_class_ifunc;
4091 switch (ELF32_R_TYPE (rela->r_info))
4093 case R_386_IRELATIVE:
4094 return reloc_class_ifunc;
4095 case R_386_RELATIVE:
4096 return reloc_class_relative;
4097 case R_386_JUMP_SLOT:
4098 return reloc_class_plt;
4100 return reloc_class_copy;
4102 return reloc_class_normal;
4106 /* Finish up the dynamic sections. */
4109 elf_i386_finish_dynamic_sections (bfd *output_bfd,
4110 struct bfd_link_info *info)
4112 struct elf_x86_link_hash_table *htab;
4115 const struct elf_i386_backend_data *abed;
4117 htab = elf_x86_hash_table (info, I386_ELF_DATA);
4121 dynobj = htab->elf.dynobj;
4122 sdyn = bfd_get_linker_section (dynobj, ".dynamic");
4123 abed = get_elf_i386_backend_data (output_bfd);
4125 if (htab->elf.dynamic_sections_created)
4127 Elf32_External_Dyn *dyncon, *dynconend;
4129 if (sdyn == NULL || htab->elf.sgot == NULL)
4132 dyncon = (Elf32_External_Dyn *) sdyn->contents;
4133 dynconend = (Elf32_External_Dyn *) (sdyn->contents + sdyn->size);
4134 for (; dyncon < dynconend; dyncon++)
4136 Elf_Internal_Dyn dyn;
4139 bfd_elf32_swap_dyn_in (dynobj, dyncon, &dyn);
4144 if (htab->is_vxworks
4145 && elf_vxworks_finish_dynamic_entry (output_bfd, &dyn))
4150 s = htab->elf.sgotplt;
4151 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4155 s = htab->elf.srelplt;
4156 dyn.d_un.d_ptr = s->output_section->vma + s->output_offset;
4160 s = htab->elf.srelplt;
4161 dyn.d_un.d_val = s->size;
4165 bfd_elf32_swap_dyn_out (output_bfd, &dyn, dyncon);
4168 if (htab->elf.splt && htab->elf.splt->size > 0)
4170 /* UnixWare sets the entsize of .plt to 4, although that doesn't
4171 really seem like the right value. */
4172 elf_section_data (htab->elf.splt->output_section)
4173 ->this_hdr.sh_entsize = 4;
4175 if (htab->plt.has_plt0)
4177 /* Fill in the special first entry in the procedure linkage
4179 memcpy (htab->elf.splt->contents, htab->plt.plt0_entry,
4180 htab->lazy_plt->plt0_entry_size);
4181 memset (htab->elf.splt->contents + htab->lazy_plt->plt0_entry_size,
4182 abed->plt0_pad_byte,
4183 htab->plt.plt_entry_size - htab->lazy_plt->plt0_entry_size);
4184 if (!bfd_link_pic (info))
4186 bfd_put_32 (output_bfd,
4187 (htab->elf.sgotplt->output_section->vma
4188 + htab->elf.sgotplt->output_offset
4190 htab->elf.splt->contents
4191 + htab->lazy_plt->plt0_got1_offset);
4192 bfd_put_32 (output_bfd,
4193 (htab->elf.sgotplt->output_section->vma
4194 + htab->elf.sgotplt->output_offset
4196 htab->elf.splt->contents
4197 + htab->lazy_plt->plt0_got2_offset);
4199 if (htab->is_vxworks)
4201 Elf_Internal_Rela rel;
4202 int num_plts = (htab->elf.splt->size
4203 / htab->plt.plt_entry_size) - 1;
4205 asection *srelplt2 = htab->srelplt2;
4207 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4208 + 4. On IA32 we use REL relocations so the
4209 addend goes in the PLT directly. */
4210 rel.r_offset = (htab->elf.splt->output_section->vma
4211 + htab->elf.splt->output_offset
4212 + htab->lazy_plt->plt0_got1_offset);
4213 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4215 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4216 srelplt2->contents);
4217 /* Generate a relocation for _GLOBAL_OFFSET_TABLE_
4219 rel.r_offset = (htab->elf.splt->output_section->vma
4220 + htab->elf.splt->output_offset
4221 + htab->lazy_plt->plt0_got2_offset);
4222 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4224 bfd_elf32_swap_reloc_out (output_bfd, &rel,
4225 srelplt2->contents +
4226 sizeof (Elf32_External_Rel));
4227 /* Correct the .rel.plt.unloaded relocations. */
4228 p = srelplt2->contents;
4229 if (bfd_link_pic (info))
4230 p += PLTRESOLVE_RELOCS_SHLIB * sizeof (Elf32_External_Rel);
4232 p += PLTRESOLVE_RELOCS * sizeof (Elf32_External_Rel);
4234 for (; num_plts; num_plts--)
4236 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4237 rel.r_info = ELF32_R_INFO (htab->elf.hgot->indx,
4239 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4240 p += sizeof (Elf32_External_Rel);
4242 bfd_elf32_swap_reloc_in (output_bfd, p, &rel);
4243 rel.r_info = ELF32_R_INFO (htab->elf.hplt->indx,
4245 bfd_elf32_swap_reloc_out (output_bfd, &rel, p);
4246 p += sizeof (Elf32_External_Rel);
4253 if (htab->plt_got != NULL && htab->plt_got->size > 0)
4254 elf_section_data (htab->plt_got->output_section)
4255 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4257 if (htab->plt_second != NULL && htab->plt_second->size > 0)
4258 elf_section_data (htab->plt_second->output_section)
4259 ->this_hdr.sh_entsize = htab->non_lazy_plt->plt_entry_size;
4262 /* Fill in the first three entries in the global offset table. */
4263 if (htab->elf.sgotplt && htab->elf.sgotplt->size > 0)
4265 if (bfd_is_abs_section (htab->elf.sgotplt->output_section))
4268 (_("discarded output section: `%A'"), htab->elf.sgotplt);
4272 bfd_put_32 (output_bfd,
4274 : sdyn->output_section->vma + sdyn->output_offset),
4275 htab->elf.sgotplt->contents);
4276 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 4);
4277 bfd_put_32 (output_bfd, 0, htab->elf.sgotplt->contents + 8);
4279 elf_section_data (htab->elf.sgotplt->output_section)->this_hdr.sh_entsize = 4;
4282 /* Adjust .eh_frame for .plt section. */
4283 if (htab->plt_eh_frame != NULL
4284 && htab->plt_eh_frame->contents != NULL)
4286 if (htab->elf.splt != NULL
4287 && htab->elf.splt->size != 0
4288 && (htab->elf.splt->flags & SEC_EXCLUDE) == 0
4289 && htab->elf.splt->output_section != NULL
4290 && htab->plt_eh_frame->output_section != NULL)
4292 bfd_vma plt_start = htab->elf.splt->output_section->vma;
4293 bfd_vma eh_frame_start = htab->plt_eh_frame->output_section->vma
4294 + htab->plt_eh_frame->output_offset
4295 + PLT_FDE_START_OFFSET;
4296 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4297 htab->plt_eh_frame->contents
4298 + PLT_FDE_START_OFFSET);
4300 if (htab->plt_eh_frame->sec_info_type
4301 == SEC_INFO_TYPE_EH_FRAME)
4303 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4305 htab->plt_eh_frame->contents))
4310 /* Adjust .eh_frame for .plt.got section. */
4311 if (htab->plt_got_eh_frame != NULL
4312 && htab->plt_got_eh_frame->contents != NULL)
4314 if (htab->plt_got != NULL
4315 && htab->plt_got->size != 0
4316 && (htab->plt_got->flags & SEC_EXCLUDE) == 0
4317 && htab->plt_got->output_section != NULL
4318 && htab->plt_got_eh_frame->output_section != NULL)
4320 bfd_vma plt_start = htab->plt_got->output_section->vma;
4321 bfd_vma eh_frame_start = htab->plt_got_eh_frame->output_section->vma
4322 + htab->plt_got_eh_frame->output_offset
4323 + PLT_FDE_START_OFFSET;
4324 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4325 htab->plt_got_eh_frame->contents
4326 + PLT_FDE_START_OFFSET);
4328 if (htab->plt_got_eh_frame->sec_info_type == SEC_INFO_TYPE_EH_FRAME)
4330 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4331 htab->plt_got_eh_frame,
4332 htab->plt_got_eh_frame->contents))
4337 /* Adjust .eh_frame for the second PLT section. */
4338 if (htab->plt_second_eh_frame != NULL
4339 && htab->plt_second_eh_frame->contents != NULL)
4341 if (htab->plt_second != NULL
4342 && htab->plt_second->size != 0
4343 && (htab->plt_second->flags & SEC_EXCLUDE) == 0
4344 && htab->plt_second->output_section != NULL
4345 && htab->plt_second_eh_frame->output_section != NULL)
4347 bfd_vma plt_start = htab->plt_second->output_section->vma;
4348 bfd_vma eh_frame_start
4349 = (htab->plt_second_eh_frame->output_section->vma
4350 + htab->plt_second_eh_frame->output_offset
4351 + PLT_FDE_START_OFFSET);
4352 bfd_put_signed_32 (dynobj, plt_start - eh_frame_start,
4353 htab->plt_second_eh_frame->contents
4354 + PLT_FDE_START_OFFSET);
4356 if (htab->plt_second_eh_frame->sec_info_type
4357 == SEC_INFO_TYPE_EH_FRAME)
4359 if (! _bfd_elf_write_section_eh_frame (output_bfd, info,
4360 htab->plt_second_eh_frame,
4361 htab->plt_second_eh_frame->contents))
4366 if (htab->elf.sgot && htab->elf.sgot->size > 0)
4367 elf_section_data (htab->elf.sgot->output_section)->this_hdr.sh_entsize = 4;
4369 /* Fill PLT entries for undefined weak symbols in PIE. */
4370 if (bfd_link_pie (info))
4371 bfd_hash_traverse (&info->hash->table,
4372 elf_i386_pie_finish_undefweak_symbol,
4378 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4379 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4380 It has to be done before elf_link_sort_relocs is called so that
4381 dynamic relocations are properly sorted. */
4384 elf_i386_output_arch_local_syms
4385 (bfd *output_bfd ATTRIBUTE_UNUSED,
4386 struct bfd_link_info *info,
4387 void *flaginfo ATTRIBUTE_UNUSED,
4388 int (*func) (void *, const char *,
4391 struct elf_link_hash_entry *) ATTRIBUTE_UNUSED)
4393 struct elf_x86_link_hash_table *htab
4394 = elf_x86_hash_table (info, I386_ELF_DATA);
4398 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4399 htab_traverse (htab->loc_hash_table,
4400 elf_i386_finish_local_dynamic_symbol,
4406 /* Forward declaration. */
4407 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt;
4409 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4410 dynamic relocations. */
4413 elf_i386_get_synthetic_symtab (bfd *abfd,
4414 long symcount ATTRIBUTE_UNUSED,
4415 asymbol **syms ATTRIBUTE_UNUSED,
4422 bfd_byte *plt_contents;
4424 const struct elf_x86_lazy_plt_layout *lazy_plt;
4425 const struct elf_x86_non_lazy_plt_layout *non_lazy_plt;
4426 const struct elf_x86_lazy_plt_layout *lazy_ibt_plt;
4427 const struct elf_x86_non_lazy_plt_layout *non_lazy_ibt_plt;
4430 enum elf_x86_plt_type plt_type;
4431 struct elf_x86_plt plts[] =
4433 { ".plt", NULL, NULL, plt_unknown, 0, 0, 0, 0 },
4434 { ".plt.got", NULL, NULL, plt_non_lazy, 0, 0, 0, 0 },
4435 { ".plt.sec", NULL, NULL, plt_second, 0, 0, 0, 0 },
4436 { NULL, NULL, NULL, plt_non_lazy, 0, 0, 0, 0 }
4441 if ((abfd->flags & (DYNAMIC | EXEC_P)) == 0)
4444 if (dynsymcount <= 0)
4447 relsize = bfd_get_dynamic_reloc_upper_bound (abfd);
4451 non_lazy_plt = NULL;
4452 /* Silence GCC 6. */
4454 non_lazy_ibt_plt = NULL;
4455 lazy_ibt_plt = NULL;
4456 switch (get_elf_i386_backend_data (abfd)->os)
4459 non_lazy_plt = &elf_i386_non_lazy_plt;
4460 lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4461 non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4464 lazy_plt = &elf_i386_lazy_plt;
4467 lazy_plt = &elf_i386_nacl_plt;
4474 for (j = 0; plts[j].name != NULL; j++)
4476 plt = bfd_get_section_by_name (abfd, plts[j].name);
4477 if (plt == NULL || plt->size == 0)
4480 /* Get the PLT section contents. */
4481 plt_contents = (bfd_byte *) bfd_malloc (plt->size);
4482 if (plt_contents == NULL)
4484 if (!bfd_get_section_contents (abfd, (asection *) plt,
4485 plt_contents, 0, plt->size))
4487 free (plt_contents);
4491 /* Check what kind of PLT it is. */
4492 plt_type = plt_unknown;
4493 if (plts[j].type == plt_unknown
4494 && (plt->size >= (lazy_plt->plt0_entry_size
4495 + lazy_plt->plt_entry_size)))
4497 /* Match lazy PLT first. */
4498 if (memcmp (plt_contents, lazy_plt->plt0_entry,
4499 lazy_plt->plt0_got1_offset) == 0)
4501 /* The fist entry in the lazy IBT PLT is the same as the
4503 if (lazy_ibt_plt != NULL
4504 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4505 lazy_ibt_plt->plt_entry,
4506 lazy_ibt_plt->plt_got_offset) == 0))
4507 plt_type = plt_lazy | plt_second;
4509 plt_type = plt_lazy;
4511 else if (memcmp (plt_contents, lazy_plt->pic_plt0_entry,
4512 lazy_plt->plt0_got1_offset) == 0)
4514 /* The fist entry in the PIC lazy IBT PLT is the same as
4515 the normal PIC lazy PLT. */
4516 if (lazy_ibt_plt != NULL
4517 && (memcmp (plt_contents + lazy_ibt_plt->plt0_entry_size,
4518 lazy_ibt_plt->pic_plt_entry,
4519 lazy_ibt_plt->plt_got_offset) == 0))
4520 plt_type = plt_lazy | plt_pic | plt_second;
4522 plt_type = plt_lazy | plt_pic;
4526 if (non_lazy_plt != NULL
4527 && (plt_type == plt_unknown || plt_type == plt_non_lazy)
4528 && plt->size >= non_lazy_plt->plt_entry_size)
4530 /* Match non-lazy PLT. */
4531 if (memcmp (plt_contents, non_lazy_plt->plt_entry,
4532 non_lazy_plt->plt_got_offset) == 0)
4533 plt_type = plt_non_lazy;
4534 else if (memcmp (plt_contents, non_lazy_plt->pic_plt_entry,
4535 non_lazy_plt->plt_got_offset) == 0)
4539 if ((non_lazy_ibt_plt != NULL)
4540 && (plt_type == plt_unknown || plt_type == plt_second)
4541 && plt->size >= non_lazy_ibt_plt->plt_entry_size)
4543 if (memcmp (plt_contents,
4544 non_lazy_ibt_plt->plt_entry,
4545 non_lazy_ibt_plt->plt_got_offset) == 0)
4547 /* Match IBT PLT. */
4548 plt_type = plt_second;
4549 non_lazy_plt = non_lazy_ibt_plt;
4551 else if (memcmp (plt_contents,
4552 non_lazy_ibt_plt->pic_plt_entry,
4553 non_lazy_ibt_plt->plt_got_offset) == 0)
4555 /* Match PIC IBT PLT. */
4556 plt_type = plt_second | plt_pic;
4557 non_lazy_plt = non_lazy_ibt_plt;
4561 if (plt_type == plt_unknown)
4563 free (plt_contents);
4568 plts[j].type = plt_type;
4570 if ((plt_type & plt_lazy))
4572 plts[j].plt_got_offset = lazy_plt->plt_got_offset;
4573 plts[j].plt_entry_size = lazy_plt->plt_entry_size;
4574 /* Skip PLT0 in lazy PLT. */
4579 plts[j].plt_got_offset = non_lazy_plt->plt_got_offset;
4580 plts[j].plt_entry_size = non_lazy_plt->plt_entry_size;
4584 /* Skip lazy PLT when the second PLT is used. */
4585 if ((plt_type & (plt_lazy | plt_second))
4586 == (plt_lazy | plt_second))
4590 n = plt->size / plts[j].plt_entry_size;
4595 plts[j].contents = plt_contents;
4597 /* The _GLOBAL_OFFSET_TABLE_ address is needed. */
4598 if ((plt_type & plt_pic))
4599 got_addr = (bfd_vma) -1;
4602 return _bfd_x86_elf_get_synthetic_symtab (abfd, count, relsize,
4603 got_addr, plts, dynsyms,
4607 /* Set up i386 GNU properties. Return the first relocatable ELF input
4608 with GNU properties if found. Otherwise, return NULL. */
4611 elf_i386_link_setup_gnu_properties (struct bfd_link_info *info)
4613 struct elf_x86_init_table init_table;
4615 init_table.normal_target = FALSE;
4616 init_table.is_vxworks = FALSE;
4617 switch (get_elf_i386_backend_data (info->output_bfd)->os)
4620 init_table.lazy_plt = &elf_i386_lazy_plt;
4621 init_table.non_lazy_plt = &elf_i386_non_lazy_plt;
4622 init_table.lazy_ibt_plt = &elf_i386_lazy_ibt_plt;
4623 init_table.non_lazy_ibt_plt = &elf_i386_non_lazy_ibt_plt;
4624 init_table.normal_target = TRUE;
4627 init_table.lazy_plt = &elf_i386_lazy_plt;
4628 init_table.non_lazy_plt = NULL;
4629 init_table.lazy_ibt_plt = NULL;
4630 init_table.non_lazy_ibt_plt = NULL;
4631 init_table.is_vxworks = TRUE;
4634 init_table.lazy_plt = &elf_i386_nacl_plt;
4635 init_table.non_lazy_plt = NULL;
4636 init_table.lazy_ibt_plt = NULL;
4637 init_table.non_lazy_ibt_plt = NULL;
4641 init_table.r_info = elf32_r_info;
4642 init_table.r_sym = elf32_r_sym;
4644 return _bfd_x86_elf_link_setup_gnu_properties (info, &init_table);
4647 #define TARGET_LITTLE_SYM i386_elf32_vec
4648 #define TARGET_LITTLE_NAME "elf32-i386"
4649 #define ELF_ARCH bfd_arch_i386
4650 #define ELF_TARGET_ID I386_ELF_DATA
4651 #define ELF_MACHINE_CODE EM_386
4652 #define ELF_MAXPAGESIZE 0x1000
4654 #define elf_backend_can_gc_sections 1
4655 #define elf_backend_can_refcount 1
4656 #define elf_backend_want_got_plt 1
4657 #define elf_backend_plt_readonly 1
4658 #define elf_backend_want_plt_sym 0
4659 #define elf_backend_got_header_size 12
4660 #define elf_backend_plt_alignment 4
4661 #define elf_backend_dtrel_excludes_plt 1
4662 #define elf_backend_extern_protected_data 1
4663 #define elf_backend_caches_rawsize 1
4664 #define elf_backend_want_dynrelro 1
4666 /* Support RELA for objdump of prelink objects. */
4667 #define elf_info_to_howto elf_i386_info_to_howto_rel
4668 #define elf_info_to_howto_rel elf_i386_info_to_howto_rel
4670 #define bfd_elf32_bfd_is_local_label_name elf_i386_is_local_label_name
4671 #define bfd_elf32_bfd_reloc_type_lookup elf_i386_reloc_type_lookup
4672 #define bfd_elf32_bfd_reloc_name_lookup elf_i386_reloc_name_lookup
4673 #define bfd_elf32_get_synthetic_symtab elf_i386_get_synthetic_symtab
4675 #define elf_backend_relocs_compatible _bfd_elf_relocs_compatible
4676 #define elf_backend_check_relocs elf_i386_check_relocs
4677 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
4678 #define elf_backend_fake_sections elf_i386_fake_sections
4679 #define elf_backend_finish_dynamic_sections elf_i386_finish_dynamic_sections
4680 #define elf_backend_finish_dynamic_symbol elf_i386_finish_dynamic_symbol
4681 #define elf_backend_output_arch_local_syms elf_i386_output_arch_local_syms
4682 #define elf_backend_grok_prstatus elf_i386_grok_prstatus
4683 #define elf_backend_grok_psinfo elf_i386_grok_psinfo
4684 #define elf_backend_reloc_type_class elf_i386_reloc_type_class
4685 #define elf_backend_relocate_section elf_i386_relocate_section
4686 #define elf_backend_setup_gnu_properties elf_i386_link_setup_gnu_properties
4688 #include "elf32-target.h"
4690 /* FreeBSD support. */
4692 #undef TARGET_LITTLE_SYM
4693 #define TARGET_LITTLE_SYM i386_elf32_fbsd_vec
4694 #undef TARGET_LITTLE_NAME
4695 #define TARGET_LITTLE_NAME "elf32-i386-freebsd"
4697 #define ELF_OSABI ELFOSABI_FREEBSD
4699 /* The kernel recognizes executables as valid only if they carry a
4700 "FreeBSD" label in the ELF header. So we put this label on all
4701 executables and (for simplicity) also all other object files. */
4704 elf_i386_fbsd_post_process_headers (bfd *abfd, struct bfd_link_info *info)
4706 _bfd_elf_post_process_headers (abfd, info);
4708 #ifdef OLD_FREEBSD_ABI_LABEL
4710 /* The ABI label supported by FreeBSD <= 4.0 is quite nonstandard. */
4711 Elf_Internal_Ehdr *i_ehdrp = elf_elfheader (abfd);
4712 memcpy (&i_ehdrp->e_ident[EI_ABIVERSION], "FreeBSD", 8);
4717 #undef elf_backend_post_process_headers
4718 #define elf_backend_post_process_headers elf_i386_fbsd_post_process_headers
4720 #define elf32_bed elf32_i386_fbsd_bed
4722 #undef elf_backend_add_symbol_hook
4724 #include "elf32-target.h"
4728 #undef TARGET_LITTLE_SYM
4729 #define TARGET_LITTLE_SYM i386_elf32_sol2_vec
4730 #undef TARGET_LITTLE_NAME
4731 #define TARGET_LITTLE_NAME "elf32-i386-sol2"
4733 #undef elf_backend_post_process_headers
4735 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
4736 objects won't be recognized. */
4740 #define elf32_bed elf32_i386_sol2_bed
4742 /* The 32-bit static TLS arena size is rounded to the nearest 8-byte
4744 #undef elf_backend_static_tls_alignment
4745 #define elf_backend_static_tls_alignment 8
4747 /* The Solaris 2 ABI requires a plt symbol on all platforms.
4749 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
4751 #undef elf_backend_want_plt_sym
4752 #define elf_backend_want_plt_sym 1
4754 #undef elf_backend_strtab_flags
4755 #define elf_backend_strtab_flags SHF_STRINGS
4757 /* Called to set the sh_flags, sh_link and sh_info fields of OSECTION which
4758 has a type >= SHT_LOOS. Returns TRUE if these fields were initialised
4759 FALSE otherwise. ISECTION is the best guess matching section from the
4760 input bfd IBFD, but it might be NULL. */
4763 elf32_i386_copy_solaris_special_section_fields (const bfd *ibfd ATTRIBUTE_UNUSED,
4764 bfd *obfd ATTRIBUTE_UNUSED,
4765 const Elf_Internal_Shdr *isection ATTRIBUTE_UNUSED,
4766 Elf_Internal_Shdr *osection ATTRIBUTE_UNUSED)
4768 /* PR 19938: FIXME: Need to add code for setting the sh_info
4769 and sh_link fields of Solaris specific section types. */
4772 /* Based upon Oracle Solaris 11.3 Linkers and Libraries Guide, Ch. 13,
4773 Object File Format, Table 13-9 ELF sh_link and sh_info Interpretation:
4775 http://docs.oracle.com/cd/E53394_01/html/E54813/chapter6-94076.html#scrolltoc
4777 The following values should be set:
4780 -----------------------------------------------------------------------------
4781 SHT_SUNW_ancillary The section header index of 0
4782 [0x6fffffee] the associated string table.
4784 SHT_SUNW_capinfo The section header index of For a dynamic object, the
4785 [0x6ffffff0] the associated symbol table. section header index of
4787 SHT_SUNW_capchain table,
4790 SHT_SUNW_symsort The section header index of 0
4791 [0x6ffffff1] the associated symbol table.
4793 SHT_SUNW_tlssort The section header index of 0
4794 [0x6ffffff2] the associated symbol table.
4796 SHT_SUNW_LDYNSYM The section header index of One greater than the
4797 [0x6ffffff3] the associated string table. symbol table index of the
4798 This index is the same string last local symbol,
4799 table used by the SHT_DYNSYM STB_LOCAL. Since
4800 section. SHT_SUNW_LDYNSYM only
4801 contains local symbols,
4802 sh_info is equivalent to
4803 the number of symbols in
4806 SHT_SUNW_cap If symbol capabilities exist, If any capabilities refer
4807 [0x6ffffff5] the section header index of to named strings, the
4808 the associated section header index of
4809 SHT_SUNW_capinfo table, the associated string
4810 otherwise 0. table, otherwise 0.
4812 SHT_SUNW_move The section header index of 0
4813 [0x6ffffffa] the associated symbol table.
4818 SHT_SUNW_syminfo The section header index of The section header index
4819 [0x6ffffffc] the associated symbol table. of the associated
4822 SHT_SUNW_verdef The section header index of The number of version
4823 [0x6ffffffd] the associated string table. definitions within the
4826 SHT_SUNW_verneed The section header index of The number of version
4827 [0x6ffffffe] the associated string table. dependencies within the
4830 SHT_SUNW_versym The section header index of 0
4831 [0x6fffffff] the associated symbol table. */
4834 #undef elf_backend_copy_special_section_fields
4835 #define elf_backend_copy_special_section_fields elf32_i386_copy_solaris_special_section_fields
4837 #include "elf32-target.h"
4839 /* Intel MCU support. */
4842 elf32_iamcu_elf_object_p (bfd *abfd)
4844 /* Set the right machine number for an IAMCU elf32 file. */
4845 bfd_default_set_arch_mach (abfd, bfd_arch_iamcu, bfd_mach_i386_iamcu);
4849 #undef TARGET_LITTLE_SYM
4850 #define TARGET_LITTLE_SYM iamcu_elf32_vec
4851 #undef TARGET_LITTLE_NAME
4852 #define TARGET_LITTLE_NAME "elf32-iamcu"
4854 #define ELF_ARCH bfd_arch_iamcu
4856 #undef ELF_MACHINE_CODE
4857 #define ELF_MACHINE_CODE EM_IAMCU
4862 #define elf32_bed elf32_iamcu_bed
4864 #undef elf_backend_object_p
4865 #define elf_backend_object_p elf32_iamcu_elf_object_p
4867 #undef elf_backend_static_tls_alignment
4869 #undef elf_backend_want_plt_sym
4870 #define elf_backend_want_plt_sym 0
4872 #undef elf_backend_strtab_flags
4873 #undef elf_backend_copy_special_section_fields
4875 #include "elf32-target.h"
4877 /* Restore defaults. */
4879 #define ELF_ARCH bfd_arch_i386
4880 #undef ELF_MACHINE_CODE
4881 #define ELF_MACHINE_CODE EM_386
4883 /* Native Client support. */
4885 #undef TARGET_LITTLE_SYM
4886 #define TARGET_LITTLE_SYM i386_elf32_nacl_vec
4887 #undef TARGET_LITTLE_NAME
4888 #define TARGET_LITTLE_NAME "elf32-i386-nacl"
4890 #define elf32_bed elf32_i386_nacl_bed
4892 #undef ELF_MAXPAGESIZE
4893 #define ELF_MAXPAGESIZE 0x10000
4895 /* Restore defaults. */
4897 #undef elf_backend_want_plt_sym
4898 #define elf_backend_want_plt_sym 0
4899 #undef elf_backend_post_process_headers
4900 #undef elf_backend_static_tls_alignment
4902 /* NaCl uses substantially different PLT entries for the same effects. */
4904 #undef elf_backend_plt_alignment
4905 #define elf_backend_plt_alignment 5
4906 #define NACL_PLT_ENTRY_SIZE 64
4907 #define NACLMASK 0xe0 /* 32-byte alignment mask. */
4909 static const bfd_byte elf_i386_nacl_plt0_entry[] =
4911 0xff, 0x35, /* pushl contents of address */
4912 0, 0, 0, 0, /* replaced with address of .got + 4. */
4913 0x8b, 0x0d, /* movl contents of address, %ecx */
4914 0, 0, 0, 0, /* replaced with address of .got + 8. */
4915 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4916 0xff, 0xe1 /* jmp *%ecx */
4919 static const bfd_byte elf_i386_nacl_plt_entry[NACL_PLT_ENTRY_SIZE] =
4921 0x8b, 0x0d, /* movl contents of address, %ecx */
4922 0, 0, 0, 0, /* replaced with GOT slot address. */
4923 0x83, 0xe1, NACLMASK, /* andl $NACLMASK, %ecx */
4924 0xff, 0xe1, /* jmp *%ecx */
4926 /* Pad to the next 32-byte boundary with nop instructions. */
4928 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4929 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4931 /* Lazy GOT entries point here (32-byte aligned). */
4932 0x68, /* pushl immediate */
4933 0, 0, 0, 0, /* replaced with reloc offset. */
4934 0xe9, /* jmp relative */
4935 0, 0, 0, 0, /* replaced with offset to .plt. */
4937 /* Pad to the next 32-byte boundary with nop instructions. */
4938 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4939 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4943 static const bfd_byte
4944 elf_i386_nacl_pic_plt0_entry[sizeof (elf_i386_nacl_plt0_entry)] =
4946 0xff, 0x73, 0x04, /* pushl 4(%ebx) */
4947 0x8b, 0x4b, 0x08, /* mov 0x8(%ebx), %ecx */
4948 0x83, 0xe1, 0xe0, /* and $NACLMASK, %ecx */
4949 0xff, 0xe1, /* jmp *%ecx */
4951 /* This is expected to be the same size as elf_i386_nacl_plt0_entry,
4952 so pad to that size with nop instructions. */
4953 0x90, 0x90, 0x90, 0x90, 0x90, 0x90
4956 static const bfd_byte elf_i386_nacl_pic_plt_entry[NACL_PLT_ENTRY_SIZE] =
4958 0x8b, 0x8b, /* movl offset(%ebx), %ecx */
4959 0, 0, 0, 0, /* replaced with offset of this symbol in .got. */
4960 0x83, 0xe1, 0xe0, /* andl $NACLMASK, %ecx */
4961 0xff, 0xe1, /* jmp *%ecx */
4963 /* Pad to the next 32-byte boundary with nop instructions. */
4965 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4966 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4968 /* Lazy GOT entries point here (32-byte aligned). */
4969 0x68, /* pushl immediate */
4970 0, 0, 0, 0, /* replaced with offset into relocation table. */
4971 0xe9, /* jmp relative */
4972 0, 0, 0, 0, /* replaced with offset to start of .plt. */
4974 /* Pad to the next 32-byte boundary with nop instructions. */
4975 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4976 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90,
4980 static const bfd_byte elf_i386_nacl_eh_frame_plt[] =
4982 #if (PLT_CIE_LENGTH != 20 \
4983 || PLT_FDE_LENGTH != 36 \
4984 || PLT_FDE_START_OFFSET != 4 + PLT_CIE_LENGTH + 8 \
4985 || PLT_FDE_LEN_OFFSET != 4 + PLT_CIE_LENGTH + 12)
4986 # error "Need elf_i386_backend_data parameters for eh_frame_plt offsets!"
4988 PLT_CIE_LENGTH, 0, 0, 0, /* CIE length */
4989 0, 0, 0, 0, /* CIE ID */
4990 1, /* CIE version */
4991 'z', 'R', 0, /* Augmentation string */
4992 1, /* Code alignment factor */
4993 0x7c, /* Data alignment factor: -4 */
4994 8, /* Return address column */
4995 1, /* Augmentation size */
4996 DW_EH_PE_pcrel | DW_EH_PE_sdata4, /* FDE encoding */
4997 DW_CFA_def_cfa, 4, 4, /* DW_CFA_def_cfa: r4 (esp) ofs 4 */
4998 DW_CFA_offset + 8, 1, /* DW_CFA_offset: r8 (eip) at cfa-4 */
4999 DW_CFA_nop, DW_CFA_nop,
5001 PLT_FDE_LENGTH, 0, 0, 0, /* FDE length */
5002 PLT_CIE_LENGTH + 8, 0, 0, 0, /* CIE pointer */
5003 0, 0, 0, 0, /* R_386_PC32 .plt goes here */
5004 0, 0, 0, 0, /* .plt size goes here */
5005 0, /* Augmentation size */
5006 DW_CFA_def_cfa_offset, 8, /* DW_CFA_def_cfa_offset: 8 */
5007 DW_CFA_advance_loc + 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
5008 DW_CFA_def_cfa_offset, 12, /* DW_CFA_def_cfa_offset: 12 */
5009 DW_CFA_advance_loc + 58, /* DW_CFA_advance_loc: 58 to __PLT__+64 */
5010 DW_CFA_def_cfa_expression, /* DW_CFA_def_cfa_expression */
5011 13, /* Block length */
5012 DW_OP_breg4, 4, /* DW_OP_breg4 (esp): 4 */
5013 DW_OP_breg8, 0, /* DW_OP_breg8 (eip): 0 */
5014 DW_OP_const1u, 63, DW_OP_and, DW_OP_const1u, 37, DW_OP_ge,
5015 DW_OP_lit2, DW_OP_shl, DW_OP_plus,
5016 DW_CFA_nop, DW_CFA_nop
5019 static const struct elf_x86_lazy_plt_layout elf_i386_nacl_plt =
5021 elf_i386_nacl_plt0_entry, /* plt0_entry */
5022 sizeof (elf_i386_nacl_plt0_entry), /* plt0_entry_size */
5023 elf_i386_nacl_plt_entry, /* plt_entry */
5024 NACL_PLT_ENTRY_SIZE, /* plt_entry_size */
5025 2, /* plt0_got1_offset */
5026 8, /* plt0_got2_offset */
5027 0, /* plt0_got2_insn_end */
5028 2, /* plt_got_offset */
5029 33, /* plt_reloc_offset */
5030 38, /* plt_plt_offset */
5031 0, /* plt_got_insn_size */
5032 0, /* plt_plt_insn_end */
5033 32, /* plt_lazy_offset */
5034 elf_i386_nacl_pic_plt0_entry, /* pic_plt0_entry */
5035 elf_i386_nacl_pic_plt_entry, /* pic_plt_entry */
5036 elf_i386_nacl_eh_frame_plt, /* eh_frame_plt */
5037 sizeof (elf_i386_nacl_eh_frame_plt) /* eh_frame_plt_size */
5040 static const struct elf_i386_backend_data elf_i386_nacl_arch_bed =
5042 0x90, /* plt0_pad_byte: nop insn */
5047 elf32_i386_nacl_elf_object_p (bfd *abfd)
5049 /* Set the right machine number for a NaCl i386 ELF32 file. */
5050 bfd_default_set_arch_mach (abfd, bfd_arch_i386, bfd_mach_i386_i386_nacl);
5054 #undef elf_backend_arch_data
5055 #define elf_backend_arch_data &elf_i386_nacl_arch_bed
5057 #undef elf_backend_object_p
5058 #define elf_backend_object_p elf32_i386_nacl_elf_object_p
5059 #undef elf_backend_modify_segment_map
5060 #define elf_backend_modify_segment_map nacl_modify_segment_map
5061 #undef elf_backend_modify_program_headers
5062 #define elf_backend_modify_program_headers nacl_modify_program_headers
5063 #undef elf_backend_final_write_processing
5064 #define elf_backend_final_write_processing nacl_final_write_processing
5066 #include "elf32-target.h"
5068 /* Restore defaults. */
5069 #undef elf_backend_object_p
5070 #undef elf_backend_modify_segment_map
5071 #undef elf_backend_modify_program_headers
5072 #undef elf_backend_final_write_processing
5074 /* VxWorks support. */
5076 #undef TARGET_LITTLE_SYM
5077 #define TARGET_LITTLE_SYM i386_elf32_vxworks_vec
5078 #undef TARGET_LITTLE_NAME
5079 #define TARGET_LITTLE_NAME "elf32-i386-vxworks"
5081 #undef ELF_MAXPAGESIZE
5082 #define ELF_MAXPAGESIZE 0x1000
5083 #undef elf_backend_plt_alignment
5084 #define elf_backend_plt_alignment 4
5086 static const struct elf_i386_backend_data elf_i386_vxworks_arch_bed =
5088 0x90, /* plt0_pad_byte */
5092 #undef elf_backend_arch_data
5093 #define elf_backend_arch_data &elf_i386_vxworks_arch_bed
5095 #undef elf_backend_relocs_compatible
5096 #undef elf_backend_add_symbol_hook
5097 #define elf_backend_add_symbol_hook \
5098 elf_vxworks_add_symbol_hook
5099 #undef elf_backend_link_output_symbol_hook
5100 #define elf_backend_link_output_symbol_hook \
5101 elf_vxworks_link_output_symbol_hook
5102 #undef elf_backend_emit_relocs
5103 #define elf_backend_emit_relocs elf_vxworks_emit_relocs
5104 #undef elf_backend_final_write_processing
5105 #define elf_backend_final_write_processing \
5106 elf_vxworks_final_write_processing
5107 #undef elf_backend_static_tls_alignment
5109 /* On VxWorks, we emit relocations against _PROCEDURE_LINKAGE_TABLE_, so
5111 #undef elf_backend_want_plt_sym
5112 #define elf_backend_want_plt_sym 1
5115 #define elf32_bed elf32_i386_vxworks_bed
5117 #include "elf32-target.h"