1 /* X86-64 specific support for ELF
2 Copyright (C) 2000-2022 Free Software Foundation, Inc.
3 Contributed by Jan Hubicka <jh@suse.cz>.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
22 #include "elfxx-x86.h"
24 #include "libiberty.h"
26 #include "opcode/i386.h"
33 /* In case we're on a 32-bit machine, construct a 64-bit "-1" value. */
34 #define MINUS_ONE (~ (bfd_vma) 0)
36 /* Since both 32-bit and 64-bit x86-64 encode relocation type in the
37 identical manner, we use ELF32_R_TYPE instead of ELF64_R_TYPE to get
38 relocation type. We also use ELF_ST_TYPE instead of ELF64_ST_TYPE
39 since they are the same. */
41 /* The relocation "howto" table. Order of fields:
42 type, rightshift, size, bitsize, pc_relative, bitpos, complain_on_overflow,
43 special_function, name, partial_inplace, src_mask, dst_mask, pcrel_offset. */
44 static reloc_howto_type x86_64_elf_howto_table
[] =
46 HOWTO(R_X86_64_NONE
, 0, 3, 0, false, 0, complain_overflow_dont
,
47 bfd_elf_generic_reloc
, "R_X86_64_NONE", false, 0, 0x00000000,
49 HOWTO(R_X86_64_64
, 0, 4, 64, false, 0, complain_overflow_dont
,
50 bfd_elf_generic_reloc
, "R_X86_64_64", false, 0, MINUS_ONE
,
52 HOWTO(R_X86_64_PC32
, 0, 2, 32, true, 0, complain_overflow_signed
,
53 bfd_elf_generic_reloc
, "R_X86_64_PC32", false, 0, 0xffffffff,
55 HOWTO(R_X86_64_GOT32
, 0, 2, 32, false, 0, complain_overflow_signed
,
56 bfd_elf_generic_reloc
, "R_X86_64_GOT32", false, 0, 0xffffffff,
58 HOWTO(R_X86_64_PLT32
, 0, 2, 32, true, 0, complain_overflow_signed
,
59 bfd_elf_generic_reloc
, "R_X86_64_PLT32", false, 0, 0xffffffff,
61 HOWTO(R_X86_64_COPY
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
62 bfd_elf_generic_reloc
, "R_X86_64_COPY", false, 0, 0xffffffff,
64 HOWTO(R_X86_64_GLOB_DAT
, 0, 4, 64, false, 0, complain_overflow_dont
,
65 bfd_elf_generic_reloc
, "R_X86_64_GLOB_DAT", false, 0, MINUS_ONE
,
67 HOWTO(R_X86_64_JUMP_SLOT
, 0, 4, 64, false, 0, complain_overflow_dont
,
68 bfd_elf_generic_reloc
, "R_X86_64_JUMP_SLOT", false, 0, MINUS_ONE
,
70 HOWTO(R_X86_64_RELATIVE
, 0, 4, 64, false, 0, complain_overflow_dont
,
71 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE", false, 0, MINUS_ONE
,
73 HOWTO(R_X86_64_GOTPCREL
, 0, 2, 32, true, 0, complain_overflow_signed
,
74 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL", false, 0, 0xffffffff,
76 HOWTO(R_X86_64_32
, 0, 2, 32, false, 0, complain_overflow_unsigned
,
77 bfd_elf_generic_reloc
, "R_X86_64_32", false, 0, 0xffffffff,
79 HOWTO(R_X86_64_32S
, 0, 2, 32, false, 0, complain_overflow_signed
,
80 bfd_elf_generic_reloc
, "R_X86_64_32S", false, 0, 0xffffffff,
82 HOWTO(R_X86_64_16
, 0, 1, 16, false, 0, complain_overflow_bitfield
,
83 bfd_elf_generic_reloc
, "R_X86_64_16", false, 0, 0xffff, false),
84 HOWTO(R_X86_64_PC16
, 0, 1, 16, true, 0, complain_overflow_bitfield
,
85 bfd_elf_generic_reloc
, "R_X86_64_PC16", false, 0, 0xffff, true),
86 HOWTO(R_X86_64_8
, 0, 0, 8, false, 0, complain_overflow_bitfield
,
87 bfd_elf_generic_reloc
, "R_X86_64_8", false, 0, 0xff, false),
88 HOWTO(R_X86_64_PC8
, 0, 0, 8, true, 0, complain_overflow_signed
,
89 bfd_elf_generic_reloc
, "R_X86_64_PC8", false, 0, 0xff, true),
90 HOWTO(R_X86_64_DTPMOD64
, 0, 4, 64, false, 0, complain_overflow_dont
,
91 bfd_elf_generic_reloc
, "R_X86_64_DTPMOD64", false, 0, MINUS_ONE
,
93 HOWTO(R_X86_64_DTPOFF64
, 0, 4, 64, false, 0, complain_overflow_dont
,
94 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF64", false, 0, MINUS_ONE
,
96 HOWTO(R_X86_64_TPOFF64
, 0, 4, 64, false, 0, complain_overflow_dont
,
97 bfd_elf_generic_reloc
, "R_X86_64_TPOFF64", false, 0, MINUS_ONE
,
99 HOWTO(R_X86_64_TLSGD
, 0, 2, 32, true, 0, complain_overflow_signed
,
100 bfd_elf_generic_reloc
, "R_X86_64_TLSGD", false, 0, 0xffffffff,
102 HOWTO(R_X86_64_TLSLD
, 0, 2, 32, true, 0, complain_overflow_signed
,
103 bfd_elf_generic_reloc
, "R_X86_64_TLSLD", false, 0, 0xffffffff,
105 HOWTO(R_X86_64_DTPOFF32
, 0, 2, 32, false, 0, complain_overflow_signed
,
106 bfd_elf_generic_reloc
, "R_X86_64_DTPOFF32", false, 0, 0xffffffff,
108 HOWTO(R_X86_64_GOTTPOFF
, 0, 2, 32, true, 0, complain_overflow_signed
,
109 bfd_elf_generic_reloc
, "R_X86_64_GOTTPOFF", false, 0, 0xffffffff,
111 HOWTO(R_X86_64_TPOFF32
, 0, 2, 32, false, 0, complain_overflow_signed
,
112 bfd_elf_generic_reloc
, "R_X86_64_TPOFF32", false, 0, 0xffffffff,
114 HOWTO(R_X86_64_PC64
, 0, 4, 64, true, 0, complain_overflow_dont
,
115 bfd_elf_generic_reloc
, "R_X86_64_PC64", false, 0, MINUS_ONE
,
117 HOWTO(R_X86_64_GOTOFF64
, 0, 4, 64, false, 0, complain_overflow_dont
,
118 bfd_elf_generic_reloc
, "R_X86_64_GOTOFF64", false, 0, MINUS_ONE
,
120 HOWTO(R_X86_64_GOTPC32
, 0, 2, 32, true, 0, complain_overflow_signed
,
121 bfd_elf_generic_reloc
, "R_X86_64_GOTPC32", false, 0, 0xffffffff,
123 HOWTO(R_X86_64_GOT64
, 0, 4, 64, false, 0, complain_overflow_signed
,
124 bfd_elf_generic_reloc
, "R_X86_64_GOT64", false, 0, MINUS_ONE
,
126 HOWTO(R_X86_64_GOTPCREL64
, 0, 4, 64, true, 0, complain_overflow_signed
,
127 bfd_elf_generic_reloc
, "R_X86_64_GOTPCREL64", false, 0, MINUS_ONE
,
129 HOWTO(R_X86_64_GOTPC64
, 0, 4, 64, true, 0, complain_overflow_signed
,
130 bfd_elf_generic_reloc
, "R_X86_64_GOTPC64", false, 0, MINUS_ONE
,
132 HOWTO(R_X86_64_GOTPLT64
, 0, 4, 64, false, 0, complain_overflow_signed
,
133 bfd_elf_generic_reloc
, "R_X86_64_GOTPLT64", false, 0, MINUS_ONE
,
135 HOWTO(R_X86_64_PLTOFF64
, 0, 4, 64, false, 0, complain_overflow_signed
,
136 bfd_elf_generic_reloc
, "R_X86_64_PLTOFF64", false, 0, MINUS_ONE
,
138 HOWTO(R_X86_64_SIZE32
, 0, 2, 32, false, 0, complain_overflow_unsigned
,
139 bfd_elf_generic_reloc
, "R_X86_64_SIZE32", false, 0, 0xffffffff,
141 HOWTO(R_X86_64_SIZE64
, 0, 4, 64, false, 0, complain_overflow_dont
,
142 bfd_elf_generic_reloc
, "R_X86_64_SIZE64", false, 0, MINUS_ONE
,
144 HOWTO(R_X86_64_GOTPC32_TLSDESC
, 0, 2, 32, true, 0,
145 complain_overflow_bitfield
, bfd_elf_generic_reloc
,
146 "R_X86_64_GOTPC32_TLSDESC", false, 0, 0xffffffff, true),
147 HOWTO(R_X86_64_TLSDESC_CALL
, 0, 3, 0, false, 0,
148 complain_overflow_dont
, bfd_elf_generic_reloc
,
149 "R_X86_64_TLSDESC_CALL",
151 HOWTO(R_X86_64_TLSDESC
, 0, 4, 64, false, 0,
152 complain_overflow_dont
, bfd_elf_generic_reloc
,
153 "R_X86_64_TLSDESC", false, 0, MINUS_ONE
, false),
154 HOWTO(R_X86_64_IRELATIVE
, 0, 4, 64, false, 0, complain_overflow_dont
,
155 bfd_elf_generic_reloc
, "R_X86_64_IRELATIVE", false, 0, MINUS_ONE
,
157 HOWTO(R_X86_64_RELATIVE64
, 0, 4, 64, false, 0, complain_overflow_dont
,
158 bfd_elf_generic_reloc
, "R_X86_64_RELATIVE64", false, 0, MINUS_ONE
,
160 HOWTO(R_X86_64_PC32_BND
, 0, 2, 32, true, 0, complain_overflow_signed
,
161 bfd_elf_generic_reloc
, "R_X86_64_PC32_BND", false, 0, 0xffffffff,
163 HOWTO(R_X86_64_PLT32_BND
, 0, 2, 32, true, 0, complain_overflow_signed
,
164 bfd_elf_generic_reloc
, "R_X86_64_PLT32_BND", false, 0, 0xffffffff,
166 HOWTO(R_X86_64_GOTPCRELX
, 0, 2, 32, true, 0, complain_overflow_signed
,
167 bfd_elf_generic_reloc
, "R_X86_64_GOTPCRELX", false, 0, 0xffffffff,
169 HOWTO(R_X86_64_REX_GOTPCRELX
, 0, 2, 32, true, 0, complain_overflow_signed
,
170 bfd_elf_generic_reloc
, "R_X86_64_REX_GOTPCRELX", false, 0, 0xffffffff,
173 /* We have a gap in the reloc numbers here.
174 R_X86_64_standard counts the number up to this point, and
175 R_X86_64_vt_offset is the value to subtract from a reloc type of
176 R_X86_64_GNU_VT* to form an index into this table. */
177 #define R_X86_64_standard (R_X86_64_REX_GOTPCRELX + 1)
178 #define R_X86_64_vt_offset (R_X86_64_GNU_VTINHERIT - R_X86_64_standard)
180 /* GNU extension to record C++ vtable hierarchy. */
181 HOWTO (R_X86_64_GNU_VTINHERIT
, 0, 4, 0, false, 0, complain_overflow_dont
,
182 NULL
, "R_X86_64_GNU_VTINHERIT", false, 0, 0, false),
184 /* GNU extension to record C++ vtable member usage. */
185 HOWTO (R_X86_64_GNU_VTENTRY
, 0, 4, 0, false, 0, complain_overflow_dont
,
186 _bfd_elf_rel_vtable_reloc_fn
, "R_X86_64_GNU_VTENTRY", false, 0, 0,
189 /* Use complain_overflow_bitfield on R_X86_64_32 for x32. */
190 HOWTO(R_X86_64_32
, 0, 2, 32, false, 0, complain_overflow_bitfield
,
191 bfd_elf_generic_reloc
, "R_X86_64_32", false, 0, 0xffffffff,
195 /* Map BFD relocs to the x86_64 elf relocs. */
198 bfd_reloc_code_real_type bfd_reloc_val
;
199 unsigned char elf_reloc_val
;
202 static const struct elf_reloc_map x86_64_reloc_map
[] =
204 { BFD_RELOC_NONE
, R_X86_64_NONE
, },
205 { BFD_RELOC_64
, R_X86_64_64
, },
206 { BFD_RELOC_32_PCREL
, R_X86_64_PC32
, },
207 { BFD_RELOC_X86_64_GOT32
, R_X86_64_GOT32
,},
208 { BFD_RELOC_X86_64_PLT32
, R_X86_64_PLT32
,},
209 { BFD_RELOC_X86_64_COPY
, R_X86_64_COPY
, },
210 { BFD_RELOC_X86_64_GLOB_DAT
, R_X86_64_GLOB_DAT
, },
211 { BFD_RELOC_X86_64_JUMP_SLOT
, R_X86_64_JUMP_SLOT
, },
212 { BFD_RELOC_X86_64_RELATIVE
, R_X86_64_RELATIVE
, },
213 { BFD_RELOC_X86_64_GOTPCREL
, R_X86_64_GOTPCREL
, },
214 { BFD_RELOC_32
, R_X86_64_32
, },
215 { BFD_RELOC_X86_64_32S
, R_X86_64_32S
, },
216 { BFD_RELOC_16
, R_X86_64_16
, },
217 { BFD_RELOC_16_PCREL
, R_X86_64_PC16
, },
218 { BFD_RELOC_8
, R_X86_64_8
, },
219 { BFD_RELOC_8_PCREL
, R_X86_64_PC8
, },
220 { BFD_RELOC_X86_64_DTPMOD64
, R_X86_64_DTPMOD64
, },
221 { BFD_RELOC_X86_64_DTPOFF64
, R_X86_64_DTPOFF64
, },
222 { BFD_RELOC_X86_64_TPOFF64
, R_X86_64_TPOFF64
, },
223 { BFD_RELOC_X86_64_TLSGD
, R_X86_64_TLSGD
, },
224 { BFD_RELOC_X86_64_TLSLD
, R_X86_64_TLSLD
, },
225 { BFD_RELOC_X86_64_DTPOFF32
, R_X86_64_DTPOFF32
, },
226 { BFD_RELOC_X86_64_GOTTPOFF
, R_X86_64_GOTTPOFF
, },
227 { BFD_RELOC_X86_64_TPOFF32
, R_X86_64_TPOFF32
, },
228 { BFD_RELOC_64_PCREL
, R_X86_64_PC64
, },
229 { BFD_RELOC_X86_64_GOTOFF64
, R_X86_64_GOTOFF64
, },
230 { BFD_RELOC_X86_64_GOTPC32
, R_X86_64_GOTPC32
, },
231 { BFD_RELOC_X86_64_GOT64
, R_X86_64_GOT64
, },
232 { BFD_RELOC_X86_64_GOTPCREL64
,R_X86_64_GOTPCREL64
, },
233 { BFD_RELOC_X86_64_GOTPC64
, R_X86_64_GOTPC64
, },
234 { BFD_RELOC_X86_64_GOTPLT64
, R_X86_64_GOTPLT64
, },
235 { BFD_RELOC_X86_64_PLTOFF64
, R_X86_64_PLTOFF64
, },
236 { BFD_RELOC_SIZE32
, R_X86_64_SIZE32
, },
237 { BFD_RELOC_SIZE64
, R_X86_64_SIZE64
, },
238 { BFD_RELOC_X86_64_GOTPC32_TLSDESC
, R_X86_64_GOTPC32_TLSDESC
, },
239 { BFD_RELOC_X86_64_TLSDESC_CALL
, R_X86_64_TLSDESC_CALL
, },
240 { BFD_RELOC_X86_64_TLSDESC
, R_X86_64_TLSDESC
, },
241 { BFD_RELOC_X86_64_IRELATIVE
, R_X86_64_IRELATIVE
, },
242 { BFD_RELOC_X86_64_PC32_BND
, R_X86_64_PC32_BND
, },
243 { BFD_RELOC_X86_64_PLT32_BND
, R_X86_64_PLT32_BND
, },
244 { BFD_RELOC_X86_64_GOTPCRELX
, R_X86_64_GOTPCRELX
, },
245 { BFD_RELOC_X86_64_REX_GOTPCRELX
, R_X86_64_REX_GOTPCRELX
, },
246 { BFD_RELOC_VTABLE_INHERIT
, R_X86_64_GNU_VTINHERIT
, },
247 { BFD_RELOC_VTABLE_ENTRY
, R_X86_64_GNU_VTENTRY
, },
250 static reloc_howto_type
*
251 elf_x86_64_rtype_to_howto (bfd
*abfd
, unsigned r_type
)
255 if (r_type
== (unsigned int) R_X86_64_32
)
260 i
= ARRAY_SIZE (x86_64_elf_howto_table
) - 1;
262 else if (r_type
< (unsigned int) R_X86_64_GNU_VTINHERIT
263 || r_type
>= (unsigned int) R_X86_64_max
)
265 if (r_type
>= (unsigned int) R_X86_64_standard
)
267 /* xgettext:c-format */
268 _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
270 bfd_set_error (bfd_error_bad_value
);
276 i
= r_type
- (unsigned int) R_X86_64_vt_offset
;
277 BFD_ASSERT (x86_64_elf_howto_table
[i
].type
== r_type
);
278 return &x86_64_elf_howto_table
[i
];
281 /* Given a BFD reloc type, return a HOWTO structure. */
282 static reloc_howto_type
*
283 elf_x86_64_reloc_type_lookup (bfd
*abfd
,
284 bfd_reloc_code_real_type code
)
288 for (i
= 0; i
< sizeof (x86_64_reloc_map
) / sizeof (struct elf_reloc_map
);
291 if (x86_64_reloc_map
[i
].bfd_reloc_val
== code
)
292 return elf_x86_64_rtype_to_howto (abfd
,
293 x86_64_reloc_map
[i
].elf_reloc_val
);
298 static reloc_howto_type
*
299 elf_x86_64_reloc_name_lookup (bfd
*abfd
,
304 if (!ABI_64_P (abfd
) && strcasecmp (r_name
, "R_X86_64_32") == 0)
306 /* Get x32 R_X86_64_32. */
307 reloc_howto_type
*reloc
308 = &x86_64_elf_howto_table
[ARRAY_SIZE (x86_64_elf_howto_table
) - 1];
309 BFD_ASSERT (reloc
->type
== (unsigned int) R_X86_64_32
);
313 for (i
= 0; i
< ARRAY_SIZE (x86_64_elf_howto_table
); i
++)
314 if (x86_64_elf_howto_table
[i
].name
!= NULL
315 && strcasecmp (x86_64_elf_howto_table
[i
].name
, r_name
) == 0)
316 return &x86_64_elf_howto_table
[i
];
321 /* Given an x86_64 ELF reloc type, fill in an arelent structure. */
324 elf_x86_64_info_to_howto (bfd
*abfd
, arelent
*cache_ptr
,
325 Elf_Internal_Rela
*dst
)
329 r_type
= ELF32_R_TYPE (dst
->r_info
);
330 cache_ptr
->howto
= elf_x86_64_rtype_to_howto (abfd
, r_type
);
331 if (cache_ptr
->howto
== NULL
)
333 BFD_ASSERT (r_type
== cache_ptr
->howto
->type
|| cache_ptr
->howto
->type
== R_X86_64_NONE
);
337 /* Support for core dump NOTE sections. */
339 elf_x86_64_grok_prstatus (bfd
*abfd
, Elf_Internal_Note
*note
)
344 switch (note
->descsz
)
349 case 296: /* sizeof(istruct elf_prstatus) on Linux/x32 */
351 elf_tdata (abfd
)->core
->signal
= bfd_get_16 (abfd
, note
->descdata
+ 12);
354 elf_tdata (abfd
)->core
->lwpid
= bfd_get_32 (abfd
, note
->descdata
+ 24);
362 case 336: /* sizeof(istruct elf_prstatus) on Linux/x86_64 */
364 elf_tdata (abfd
)->core
->signal
365 = bfd_get_16 (abfd
, note
->descdata
+ 12);
368 elf_tdata (abfd
)->core
->lwpid
369 = bfd_get_32 (abfd
, note
->descdata
+ 32);
378 /* Make a ".reg/999" section. */
379 return _bfd_elfcore_make_pseudosection (abfd
, ".reg",
380 size
, note
->descpos
+ offset
);
384 elf_x86_64_grok_psinfo (bfd
*abfd
, Elf_Internal_Note
*note
)
386 switch (note
->descsz
)
391 case 124: /* sizeof(struct elf_prpsinfo) on Linux/x32 */
392 elf_tdata (abfd
)->core
->pid
393 = bfd_get_32 (abfd
, note
->descdata
+ 12);
394 elf_tdata (abfd
)->core
->program
395 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 28, 16);
396 elf_tdata (abfd
)->core
->command
397 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 44, 80);
400 case 136: /* sizeof(struct elf_prpsinfo) on Linux/x86_64 */
401 elf_tdata (abfd
)->core
->pid
402 = bfd_get_32 (abfd
, note
->descdata
+ 24);
403 elf_tdata (abfd
)->core
->program
404 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 40, 16);
405 elf_tdata (abfd
)->core
->command
406 = _bfd_elfcore_strndup (abfd
, note
->descdata
+ 56, 80);
409 /* Note that for some reason, a spurious space is tacked
410 onto the end of the args in some (at least one anyway)
411 implementations, so strip it off if it exists. */
414 char *command
= elf_tdata (abfd
)->core
->command
;
415 int n
= strlen (command
);
417 if (0 < n
&& command
[n
- 1] == ' ')
418 command
[n
- 1] = '\0';
425 # if GCC_VERSION >= 8000
426 # pragma GCC diagnostic push
427 # pragma GCC diagnostic ignored "-Wstringop-truncation"
430 elf_x86_64_write_core_note (bfd
*abfd
, char *buf
, int *bufsiz
,
433 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
435 const char *fname
, *psargs
;
446 va_start (ap
, note_type
);
447 fname
= va_arg (ap
, const char *);
448 psargs
= va_arg (ap
, const char *);
451 if (bed
->s
->elfclass
== ELFCLASS32
)
454 memset (&data
, 0, sizeof (data
));
455 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
456 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
457 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
458 &data
, sizeof (data
));
463 memset (&data
, 0, sizeof (data
));
464 strncpy (data
.pr_fname
, fname
, sizeof (data
.pr_fname
));
465 strncpy (data
.pr_psargs
, psargs
, sizeof (data
.pr_psargs
));
466 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
467 &data
, sizeof (data
));
472 va_start (ap
, note_type
);
473 pid
= va_arg (ap
, long);
474 cursig
= va_arg (ap
, int);
475 gregs
= va_arg (ap
, const void *);
478 if (bed
->s
->elfclass
== ELFCLASS32
)
480 if (bed
->elf_machine_code
== EM_X86_64
)
482 prstatusx32_t prstat
;
483 memset (&prstat
, 0, sizeof (prstat
));
485 prstat
.pr_cursig
= cursig
;
486 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
487 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
488 &prstat
, sizeof (prstat
));
493 memset (&prstat
, 0, sizeof (prstat
));
495 prstat
.pr_cursig
= cursig
;
496 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
497 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
498 &prstat
, sizeof (prstat
));
504 memset (&prstat
, 0, sizeof (prstat
));
506 prstat
.pr_cursig
= cursig
;
507 memcpy (&prstat
.pr_reg
, gregs
, sizeof (prstat
.pr_reg
));
508 return elfcore_write_note (abfd
, buf
, bufsiz
, "CORE", note_type
,
509 &prstat
, sizeof (prstat
));
514 # if GCC_VERSION >= 8000
515 # pragma GCC diagnostic pop
519 /* Functions for the x86-64 ELF linker. */
521 /* The size in bytes of an entry in the global offset table. */
523 #define GOT_ENTRY_SIZE 8
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 a lazy procedure linkage table looks like this.
535 See the SVR4 ABI i386 supplement and the x86-64 ABI to see how this
538 static const bfd_byte elf_x86_64_lazy_plt0_entry
[LAZY_PLT_ENTRY_SIZE
] =
540 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
541 0xff, 0x25, 16, 0, 0, 0, /* jmpq *GOT+16(%rip) */
542 0x0f, 0x1f, 0x40, 0x00 /* nopl 0(%rax) */
545 /* Subsequent entries in a lazy procedure linkage table look like this. */
547 static const bfd_byte elf_x86_64_lazy_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
549 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
550 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
551 0x68, /* pushq immediate */
552 0, 0, 0, 0, /* replaced with index into relocation table. */
553 0xe9, /* jmp relative */
554 0, 0, 0, 0 /* replaced with offset to start of .plt0. */
557 /* The first entry in a lazy procedure linkage table with BND prefix
560 static const bfd_byte elf_x86_64_lazy_bnd_plt0_entry
[LAZY_PLT_ENTRY_SIZE
] =
562 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
563 0xf2, 0xff, 0x25, 16, 0, 0, 0, /* bnd jmpq *GOT+16(%rip) */
564 0x0f, 0x1f, 0 /* nopl (%rax) */
567 /* Subsequent entries for branches with BND prefx in a lazy procedure
568 linkage table look like this. */
570 static const bfd_byte elf_x86_64_lazy_bnd_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
572 0x68, 0, 0, 0, 0, /* pushq immediate */
573 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
574 0x0f, 0x1f, 0x44, 0, 0 /* nopl 0(%rax,%rax,1) */
577 /* The first entry in the IBT-enabled lazy procedure linkage table is the
578 the same as the lazy PLT with BND prefix so that bound registers are
579 preserved when control is passed to dynamic linker. Subsequent
580 entries for a IBT-enabled lazy procedure linkage table look like
583 static const bfd_byte elf_x86_64_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
585 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
586 0x68, 0, 0, 0, 0, /* pushq immediate */
587 0xf2, 0xe9, 0, 0, 0, 0, /* bnd jmpq relative */
591 /* The first entry in the x32 IBT-enabled lazy procedure linkage table
592 is the same as the normal lazy PLT. Subsequent entries for an
593 x32 IBT-enabled lazy procedure linkage table look like this. */
595 static const bfd_byte elf_x32_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
597 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
598 0x68, 0, 0, 0, 0, /* pushq immediate */
599 0xe9, 0, 0, 0, 0, /* jmpq relative */
600 0x66, 0x90 /* xchg %ax,%ax */
603 /* Entries in the non-lazey procedure linkage table look like this. */
605 static const bfd_byte elf_x86_64_non_lazy_plt_entry
[NON_LAZY_PLT_ENTRY_SIZE
] =
607 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
608 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
609 0x66, 0x90 /* xchg %ax,%ax */
612 /* Entries for branches with BND prefix in the non-lazey procedure
613 linkage table look like this. */
615 static const bfd_byte elf_x86_64_non_lazy_bnd_plt_entry
[NON_LAZY_PLT_ENTRY_SIZE
] =
617 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
618 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
622 /* Entries for branches with IBT-enabled in the non-lazey procedure
623 linkage table look like this. They have the same size as the lazy
626 static const bfd_byte elf_x86_64_non_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
628 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
629 0xf2, 0xff, 0x25, /* bnd jmpq *name@GOTPC(%rip) */
630 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
631 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopl 0x0(%rax,%rax,1) */
634 /* Entries for branches with IBT-enabled in the x32 non-lazey procedure
635 linkage table look like this. They have the same size as the lazy
638 static const bfd_byte elf_x32_non_lazy_ibt_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
640 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
641 0xff, 0x25, /* jmpq *name@GOTPC(%rip) */
642 0, 0, 0, 0, /* replaced with offset to this symbol in .got. */
643 0x66, 0x0f, 0x1f, 0x44, 0x00, 0x00 /* nopw 0x0(%rax,%rax,1) */
646 /* The TLSDESC entry in a lazy procedure linkage table. */
647 static const bfd_byte elf_x86_64_tlsdesc_plt_entry
[LAZY_PLT_ENTRY_SIZE
] =
649 0xf3, 0x0f, 0x1e, 0xfa, /* endbr64 */
650 0xff, 0x35, 8, 0, 0, 0, /* pushq GOT+8(%rip) */
651 0xff, 0x25, 16, 0, 0, 0 /* jmpq *GOT+TDG(%rip) */
654 /* .eh_frame covering the lazy .plt section. */
656 static const bfd_byte elf_x86_64_eh_frame_lazy_plt
[] =
658 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
659 0, 0, 0, 0, /* CIE ID */
661 'z', 'R', 0, /* Augmentation string */
662 1, /* Code alignment factor */
663 0x78, /* Data alignment factor */
664 16, /* Return address column */
665 1, /* Augmentation size */
666 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
667 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
668 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
669 DW_CFA_nop
, DW_CFA_nop
,
671 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
672 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
673 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
674 0, 0, 0, 0, /* .plt size goes here */
675 0, /* Augmentation size */
676 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
677 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
678 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
679 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
680 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
681 11, /* Block length */
682 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
683 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
684 DW_OP_lit15
, DW_OP_and
, DW_OP_lit11
, DW_OP_ge
,
685 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
686 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
689 /* .eh_frame covering the lazy BND .plt section. */
691 static const bfd_byte elf_x86_64_eh_frame_lazy_bnd_plt
[] =
693 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
694 0, 0, 0, 0, /* CIE ID */
696 'z', 'R', 0, /* Augmentation string */
697 1, /* Code alignment factor */
698 0x78, /* Data alignment factor */
699 16, /* Return address column */
700 1, /* Augmentation size */
701 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
702 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
703 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
704 DW_CFA_nop
, DW_CFA_nop
,
706 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
707 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
708 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
709 0, 0, 0, 0, /* .plt size goes here */
710 0, /* Augmentation size */
711 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
712 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
713 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
714 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
715 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
716 11, /* Block length */
717 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
718 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
719 DW_OP_lit15
, DW_OP_and
, DW_OP_lit5
, DW_OP_ge
,
720 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
721 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
724 /* .eh_frame covering the lazy .plt section with IBT-enabled. */
726 static const bfd_byte elf_x86_64_eh_frame_lazy_ibt_plt
[] =
728 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
729 0, 0, 0, 0, /* CIE ID */
731 'z', 'R', 0, /* Augmentation string */
732 1, /* Code alignment factor */
733 0x78, /* Data alignment factor */
734 16, /* Return address column */
735 1, /* Augmentation size */
736 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
737 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
738 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
739 DW_CFA_nop
, DW_CFA_nop
,
741 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
742 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
743 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
744 0, 0, 0, 0, /* .plt size goes here */
745 0, /* Augmentation size */
746 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
747 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
748 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
749 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
750 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
751 11, /* Block length */
752 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
753 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
754 DW_OP_lit15
, DW_OP_and
, DW_OP_lit10
, DW_OP_ge
,
755 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
756 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
759 /* .eh_frame covering the x32 lazy .plt section with IBT-enabled. */
761 static const bfd_byte elf_x32_eh_frame_lazy_ibt_plt
[] =
763 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
764 0, 0, 0, 0, /* CIE ID */
766 'z', 'R', 0, /* Augmentation string */
767 1, /* Code alignment factor */
768 0x78, /* Data alignment factor */
769 16, /* Return address column */
770 1, /* Augmentation size */
771 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
772 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
773 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
774 DW_CFA_nop
, DW_CFA_nop
,
776 PLT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
777 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
778 0, 0, 0, 0, /* R_X86_64_PC32 .plt goes here */
779 0, 0, 0, 0, /* .plt size goes here */
780 0, /* Augmentation size */
781 DW_CFA_def_cfa_offset
, 16, /* DW_CFA_def_cfa_offset: 16 */
782 DW_CFA_advance_loc
+ 6, /* DW_CFA_advance_loc: 6 to __PLT__+6 */
783 DW_CFA_def_cfa_offset
, 24, /* DW_CFA_def_cfa_offset: 24 */
784 DW_CFA_advance_loc
+ 10, /* DW_CFA_advance_loc: 10 to __PLT__+16 */
785 DW_CFA_def_cfa_expression
, /* DW_CFA_def_cfa_expression */
786 11, /* Block length */
787 DW_OP_breg7
, 8, /* DW_OP_breg7 (rsp): 8 */
788 DW_OP_breg16
, 0, /* DW_OP_breg16 (rip): 0 */
789 DW_OP_lit15
, DW_OP_and
, DW_OP_lit9
, DW_OP_ge
,
790 DW_OP_lit3
, DW_OP_shl
, DW_OP_plus
,
791 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
794 /* .eh_frame covering the non-lazy .plt section. */
796 static const bfd_byte elf_x86_64_eh_frame_non_lazy_plt
[] =
798 #define PLT_GOT_FDE_LENGTH 20
799 PLT_CIE_LENGTH
, 0, 0, 0, /* CIE length */
800 0, 0, 0, 0, /* CIE ID */
802 'z', 'R', 0, /* Augmentation string */
803 1, /* Code alignment factor */
804 0x78, /* Data alignment factor */
805 16, /* Return address column */
806 1, /* Augmentation size */
807 DW_EH_PE_pcrel
| DW_EH_PE_sdata4
, /* FDE encoding */
808 DW_CFA_def_cfa
, 7, 8, /* DW_CFA_def_cfa: r7 (rsp) ofs 8 */
809 DW_CFA_offset
+ 16, 1, /* DW_CFA_offset: r16 (rip) at cfa-8 */
810 DW_CFA_nop
, DW_CFA_nop
,
812 PLT_GOT_FDE_LENGTH
, 0, 0, 0, /* FDE length */
813 PLT_CIE_LENGTH
+ 8, 0, 0, 0, /* CIE pointer */
814 0, 0, 0, 0, /* the start of non-lazy .plt goes here */
815 0, 0, 0, 0, /* non-lazy .plt size goes here */
816 0, /* Augmentation size */
817 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
,
818 DW_CFA_nop
, DW_CFA_nop
, DW_CFA_nop
821 /* These are the standard parameters. */
822 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_plt
=
824 elf_x86_64_lazy_plt0_entry
, /* plt0_entry */
825 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
826 elf_x86_64_lazy_plt_entry
, /* plt_entry */
827 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
828 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
829 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
830 6, /* plt_tlsdesc_got1_offset */
831 12, /* plt_tlsdesc_got2_offset */
832 10, /* plt_tlsdesc_got1_insn_end */
833 16, /* plt_tlsdesc_got2_insn_end */
834 2, /* plt0_got1_offset */
835 8, /* plt0_got2_offset */
836 12, /* plt0_got2_insn_end */
837 2, /* plt_got_offset */
838 7, /* plt_reloc_offset */
839 12, /* plt_plt_offset */
840 6, /* plt_got_insn_size */
841 LAZY_PLT_ENTRY_SIZE
, /* plt_plt_insn_end */
842 6, /* plt_lazy_offset */
843 elf_x86_64_lazy_plt0_entry
, /* pic_plt0_entry */
844 elf_x86_64_lazy_plt_entry
, /* pic_plt_entry */
845 elf_x86_64_eh_frame_lazy_plt
, /* eh_frame_plt */
846 sizeof (elf_x86_64_eh_frame_lazy_plt
) /* eh_frame_plt_size */
849 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_plt
=
851 elf_x86_64_non_lazy_plt_entry
, /* plt_entry */
852 elf_x86_64_non_lazy_plt_entry
, /* pic_plt_entry */
853 NON_LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
854 2, /* plt_got_offset */
855 6, /* plt_got_insn_size */
856 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
857 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
860 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_bnd_plt
=
862 elf_x86_64_lazy_bnd_plt0_entry
, /* plt0_entry */
863 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
864 elf_x86_64_lazy_bnd_plt_entry
, /* plt_entry */
865 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
866 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
867 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
868 6, /* plt_tlsdesc_got1_offset */
869 12, /* plt_tlsdesc_got2_offset */
870 10, /* plt_tlsdesc_got1_insn_end */
871 16, /* plt_tlsdesc_got2_insn_end */
872 2, /* plt0_got1_offset */
873 1+8, /* plt0_got2_offset */
874 1+12, /* plt0_got2_insn_end */
875 1+2, /* plt_got_offset */
876 1, /* plt_reloc_offset */
877 7, /* plt_plt_offset */
878 1+6, /* plt_got_insn_size */
879 11, /* plt_plt_insn_end */
880 0, /* plt_lazy_offset */
881 elf_x86_64_lazy_bnd_plt0_entry
, /* pic_plt0_entry */
882 elf_x86_64_lazy_bnd_plt_entry
, /* pic_plt_entry */
883 elf_x86_64_eh_frame_lazy_bnd_plt
, /* eh_frame_plt */
884 sizeof (elf_x86_64_eh_frame_lazy_bnd_plt
) /* eh_frame_plt_size */
887 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_bnd_plt
=
889 elf_x86_64_non_lazy_bnd_plt_entry
, /* plt_entry */
890 elf_x86_64_non_lazy_bnd_plt_entry
, /* pic_plt_entry */
891 NON_LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
892 1+2, /* plt_got_offset */
893 1+6, /* plt_got_insn_size */
894 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
895 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
898 static const struct elf_x86_lazy_plt_layout elf_x86_64_lazy_ibt_plt
=
900 elf_x86_64_lazy_bnd_plt0_entry
, /* plt0_entry */
901 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
902 elf_x86_64_lazy_ibt_plt_entry
, /* plt_entry */
903 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
904 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
905 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
906 6, /* plt_tlsdesc_got1_offset */
907 12, /* plt_tlsdesc_got2_offset */
908 10, /* plt_tlsdesc_got1_insn_end */
909 16, /* plt_tlsdesc_got2_insn_end */
910 2, /* plt0_got1_offset */
911 1+8, /* plt0_got2_offset */
912 1+12, /* plt0_got2_insn_end */
913 4+1+2, /* plt_got_offset */
914 4+1, /* plt_reloc_offset */
915 4+1+6, /* plt_plt_offset */
916 4+1+6, /* plt_got_insn_size */
917 4+1+5+5, /* plt_plt_insn_end */
918 0, /* plt_lazy_offset */
919 elf_x86_64_lazy_bnd_plt0_entry
, /* pic_plt0_entry */
920 elf_x86_64_lazy_ibt_plt_entry
, /* pic_plt_entry */
921 elf_x86_64_eh_frame_lazy_ibt_plt
, /* eh_frame_plt */
922 sizeof (elf_x86_64_eh_frame_lazy_ibt_plt
) /* eh_frame_plt_size */
925 static const struct elf_x86_lazy_plt_layout elf_x32_lazy_ibt_plt
=
927 elf_x86_64_lazy_plt0_entry
, /* plt0_entry */
928 LAZY_PLT_ENTRY_SIZE
, /* plt0_entry_size */
929 elf_x32_lazy_ibt_plt_entry
, /* plt_entry */
930 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
931 elf_x86_64_tlsdesc_plt_entry
, /* plt_tlsdesc_entry */
932 LAZY_PLT_ENTRY_SIZE
, /* plt_tlsdesc_entry_size */
933 6, /* plt_tlsdesc_got1_offset */
934 12, /* plt_tlsdesc_got2_offset */
935 10, /* plt_tlsdesc_got1_insn_end */
936 16, /* plt_tlsdesc_got2_insn_end */
937 2, /* plt0_got1_offset */
938 8, /* plt0_got2_offset */
939 12, /* plt0_got2_insn_end */
940 4+2, /* plt_got_offset */
941 4+1, /* plt_reloc_offset */
942 4+6, /* plt_plt_offset */
943 4+6, /* plt_got_insn_size */
944 4+5+5, /* plt_plt_insn_end */
945 0, /* plt_lazy_offset */
946 elf_x86_64_lazy_plt0_entry
, /* pic_plt0_entry */
947 elf_x32_lazy_ibt_plt_entry
, /* pic_plt_entry */
948 elf_x32_eh_frame_lazy_ibt_plt
, /* eh_frame_plt */
949 sizeof (elf_x32_eh_frame_lazy_ibt_plt
) /* eh_frame_plt_size */
952 static const struct elf_x86_non_lazy_plt_layout elf_x86_64_non_lazy_ibt_plt
=
954 elf_x86_64_non_lazy_ibt_plt_entry
, /* plt_entry */
955 elf_x86_64_non_lazy_ibt_plt_entry
, /* pic_plt_entry */
956 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
957 4+1+2, /* plt_got_offset */
958 4+1+6, /* plt_got_insn_size */
959 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
960 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
963 static const struct elf_x86_non_lazy_plt_layout elf_x32_non_lazy_ibt_plt
=
965 elf_x32_non_lazy_ibt_plt_entry
, /* plt_entry */
966 elf_x32_non_lazy_ibt_plt_entry
, /* pic_plt_entry */
967 LAZY_PLT_ENTRY_SIZE
, /* plt_entry_size */
968 4+2, /* plt_got_offset */
969 4+6, /* plt_got_insn_size */
970 elf_x86_64_eh_frame_non_lazy_plt
, /* eh_frame_plt */
971 sizeof (elf_x86_64_eh_frame_non_lazy_plt
) /* eh_frame_plt_size */
976 elf64_x86_64_elf_object_p (bfd
*abfd
)
978 /* Set the right machine number for an x86-64 elf64 file. */
979 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x86_64
);
984 elf32_x86_64_elf_object_p (bfd
*abfd
)
986 /* Set the right machine number for an x86-64 elf32 file. */
987 bfd_default_set_arch_mach (abfd
, bfd_arch_i386
, bfd_mach_x64_32
);
991 /* Return TRUE if the TLS access code sequence support transition
995 elf_x86_64_check_tls_transition (bfd
*abfd
,
996 struct bfd_link_info
*info
,
999 Elf_Internal_Shdr
*symtab_hdr
,
1000 struct elf_link_hash_entry
**sym_hashes
,
1001 unsigned int r_type
,
1002 const Elf_Internal_Rela
*rel
,
1003 const Elf_Internal_Rela
*relend
)
1006 unsigned long r_symndx
;
1007 bool largepic
= false;
1008 struct elf_link_hash_entry
*h
;
1010 struct elf_x86_link_hash_table
*htab
;
1014 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
1015 offset
= rel
->r_offset
;
1018 case R_X86_64_TLSGD
:
1019 case R_X86_64_TLSLD
:
1020 if ((rel
+ 1) >= relend
)
1023 if (r_type
== R_X86_64_TLSGD
)
1025 /* Check transition from GD access model. For 64bit, only
1026 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1027 .word 0x6666; rex64; call __tls_get_addr@PLT
1029 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
1031 call *__tls_get_addr@GOTPCREL(%rip)
1032 which may be converted to
1033 addr32 call __tls_get_addr
1034 can transit to different access model. For 32bit, only
1035 leaq foo@tlsgd(%rip), %rdi
1036 .word 0x6666; rex64; call __tls_get_addr@PLT
1038 leaq foo@tlsgd(%rip), %rdi
1040 call *__tls_get_addr@GOTPCREL(%rip)
1041 which may be converted to
1042 addr32 call __tls_get_addr
1043 can transit to different access model. For largepic,
1045 leaq foo@tlsgd(%rip), %rdi
1046 movabsq $__tls_get_addr@pltoff, %rax
1050 leaq foo@tlsgd(%rip), %rdi
1051 movabsq $__tls_get_addr@pltoff, %rax
1055 static const unsigned char leaq
[] = { 0x66, 0x48, 0x8d, 0x3d };
1057 if ((offset
+ 12) > sec
->size
)
1060 call
= contents
+ offset
+ 4;
1062 || !((call
[1] == 0x48
1070 && call
[3] == 0xe8)))
1072 if (!ABI_64_P (abfd
)
1073 || (offset
+ 19) > sec
->size
1075 || memcmp (call
- 7, leaq
+ 1, 3) != 0
1076 || memcmp (call
, "\x48\xb8", 2) != 0
1080 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1081 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1085 else if (ABI_64_P (abfd
))
1088 || memcmp (contents
+ offset
- 4, leaq
, 4) != 0)
1094 || memcmp (contents
+ offset
- 3, leaq
+ 1, 3) != 0)
1097 indirect_call
= call
[2] == 0xff;
1101 /* Check transition from LD access model. Only
1102 leaq foo@tlsld(%rip), %rdi;
1103 call __tls_get_addr@PLT
1105 leaq foo@tlsld(%rip), %rdi;
1106 call *__tls_get_addr@GOTPCREL(%rip)
1107 which may be converted to
1108 addr32 call __tls_get_addr
1109 can transit to different access model. For largepic
1111 leaq foo@tlsld(%rip), %rdi
1112 movabsq $__tls_get_addr@pltoff, %rax
1116 leaq foo@tlsld(%rip), %rdi
1117 movabsq $__tls_get_addr@pltoff, %rax
1121 static const unsigned char lea
[] = { 0x48, 0x8d, 0x3d };
1123 if (offset
< 3 || (offset
+ 9) > sec
->size
)
1126 if (memcmp (contents
+ offset
- 3, lea
, 3) != 0)
1129 call
= contents
+ offset
+ 4;
1130 if (!(call
[0] == 0xe8
1131 || (call
[0] == 0xff && call
[1] == 0x15)
1132 || (call
[0] == 0x67 && call
[1] == 0xe8)))
1134 if (!ABI_64_P (abfd
)
1135 || (offset
+ 19) > sec
->size
1136 || memcmp (call
, "\x48\xb8", 2) != 0
1140 || !((call
[10] == 0x48 && call
[12] == 0xd8)
1141 || (call
[10] == 0x4c && call
[12] == 0xf8)))
1145 indirect_call
= call
[0] == 0xff;
1148 r_symndx
= htab
->r_sym (rel
[1].r_info
);
1149 if (r_symndx
< symtab_hdr
->sh_info
)
1152 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1154 || !((struct elf_x86_link_hash_entry
*) h
)->tls_get_addr
)
1158 r_type
= (ELF32_R_TYPE (rel
[1].r_info
)
1159 & ~R_X86_64_converted_reloc_bit
);
1161 return r_type
== R_X86_64_PLTOFF64
;
1162 else if (indirect_call
)
1163 return r_type
== R_X86_64_GOTPCRELX
;
1165 return (r_type
== R_X86_64_PC32
|| r_type
== R_X86_64_PLT32
);
1168 case R_X86_64_GOTTPOFF
:
1169 /* Check transition from IE access model:
1170 mov foo@gottpoff(%rip), %reg
1171 add foo@gottpoff(%rip), %reg
1174 /* Check REX prefix first. */
1175 if (offset
>= 3 && (offset
+ 4) <= sec
->size
)
1177 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1178 if (val
!= 0x48 && val
!= 0x4c)
1180 /* X32 may have 0x44 REX prefix or no REX prefix. */
1181 if (ABI_64_P (abfd
))
1187 /* X32 may not have any REX prefix. */
1188 if (ABI_64_P (abfd
))
1190 if (offset
< 2 || (offset
+ 3) > sec
->size
)
1194 val
= bfd_get_8 (abfd
, contents
+ offset
- 2);
1195 if (val
!= 0x8b && val
!= 0x03)
1198 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1199 return (val
& 0xc7) == 5;
1201 case R_X86_64_GOTPC32_TLSDESC
:
1202 /* Check transition from GDesc access model:
1203 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
1204 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
1206 Make sure it's a leaq adding rip to a 32-bit offset
1207 into any register, although it's probably almost always
1210 if (offset
< 3 || (offset
+ 4) > sec
->size
)
1213 val
= bfd_get_8 (abfd
, contents
+ offset
- 3);
1215 if (val
!= 0x48 && (ABI_64_P (abfd
) || val
!= 0x40))
1218 if (bfd_get_8 (abfd
, contents
+ offset
- 2) != 0x8d)
1221 val
= bfd_get_8 (abfd
, contents
+ offset
- 1);
1222 return (val
& 0xc7) == 0x05;
1224 case R_X86_64_TLSDESC_CALL
:
1225 /* Check transition from GDesc access model:
1226 call *x@tlsdesc(%rax) <--- LP64 mode.
1227 call *x@tlsdesc(%eax) <--- X32 mode.
1229 if (offset
+ 2 <= sec
->size
)
1231 unsigned int prefix
;
1232 call
= contents
+ offset
;
1234 if (!ABI_64_P (abfd
))
1236 /* Check for call *x@tlsdesc(%eax). */
1237 if (call
[0] == 0x67)
1240 if (offset
+ 3 > sec
->size
)
1244 /* Make sure that it's a call *x@tlsdesc(%rax). */
1245 return call
[prefix
] == 0xff && call
[1 + prefix
] == 0x10;
1255 /* Return TRUE if the TLS access transition is OK or no transition
1256 will be performed. Update R_TYPE if there is a transition. */
1259 elf_x86_64_tls_transition (struct bfd_link_info
*info
, bfd
*abfd
,
1260 asection
*sec
, bfd_byte
*contents
,
1261 Elf_Internal_Shdr
*symtab_hdr
,
1262 struct elf_link_hash_entry
**sym_hashes
,
1263 unsigned int *r_type
, int tls_type
,
1264 const Elf_Internal_Rela
*rel
,
1265 const Elf_Internal_Rela
*relend
,
1266 struct elf_link_hash_entry
*h
,
1267 unsigned long r_symndx
,
1268 bool from_relocate_section
)
1270 unsigned int from_type
= *r_type
;
1271 unsigned int to_type
= from_type
;
1274 /* Skip TLS transition for functions. */
1276 && (h
->type
== STT_FUNC
1277 || h
->type
== STT_GNU_IFUNC
))
1282 case R_X86_64_TLSGD
:
1283 case R_X86_64_GOTPC32_TLSDESC
:
1284 case R_X86_64_TLSDESC_CALL
:
1285 case R_X86_64_GOTTPOFF
:
1286 if (bfd_link_executable (info
))
1289 to_type
= R_X86_64_TPOFF32
;
1291 to_type
= R_X86_64_GOTTPOFF
;
1294 /* When we are called from elf_x86_64_relocate_section, there may
1295 be additional transitions based on TLS_TYPE. */
1296 if (from_relocate_section
)
1298 unsigned int new_to_type
= to_type
;
1300 if (TLS_TRANSITION_IE_TO_LE_P (info
, h
, tls_type
))
1301 new_to_type
= R_X86_64_TPOFF32
;
1303 if (to_type
== R_X86_64_TLSGD
1304 || to_type
== R_X86_64_GOTPC32_TLSDESC
1305 || to_type
== R_X86_64_TLSDESC_CALL
)
1307 if (tls_type
== GOT_TLS_IE
)
1308 new_to_type
= R_X86_64_GOTTPOFF
;
1311 /* We checked the transition before when we were called from
1312 elf_x86_64_scan_relocs. We only want to check the new
1313 transition which hasn't been checked before. */
1314 check
= new_to_type
!= to_type
&& from_type
== to_type
;
1315 to_type
= new_to_type
;
1320 case R_X86_64_TLSLD
:
1321 if (bfd_link_executable (info
))
1322 to_type
= R_X86_64_TPOFF32
;
1329 /* Return TRUE if there is no transition. */
1330 if (from_type
== to_type
)
1333 /* Check if the transition can be performed. */
1335 && ! elf_x86_64_check_tls_transition (abfd
, info
, sec
, contents
,
1336 symtab_hdr
, sym_hashes
,
1337 from_type
, rel
, relend
))
1339 reloc_howto_type
*from
, *to
;
1342 from
= elf_x86_64_rtype_to_howto (abfd
, from_type
);
1343 to
= elf_x86_64_rtype_to_howto (abfd
, to_type
);
1345 if (from
== NULL
|| to
== NULL
)
1349 name
= h
->root
.root
.string
;
1352 struct elf_x86_link_hash_table
*htab
;
1354 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
1359 Elf_Internal_Sym
*isym
;
1361 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
1363 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
, NULL
);
1368 /* xgettext:c-format */
1369 (_("%pB: TLS transition from %s to %s against `%s' at %#" PRIx64
1370 " in section `%pA' failed"),
1371 abfd
, from
->name
, to
->name
, name
, (uint64_t) rel
->r_offset
, sec
);
1372 bfd_set_error (bfd_error_bad_value
);
1381 elf_x86_64_need_pic (struct bfd_link_info
*info
,
1382 bfd
*input_bfd
, asection
*sec
,
1383 struct elf_link_hash_entry
*h
,
1384 Elf_Internal_Shdr
*symtab_hdr
,
1385 Elf_Internal_Sym
*isym
,
1386 reloc_howto_type
*howto
)
1389 const char *und
= "";
1390 const char *pic
= "";
1396 name
= h
->root
.root
.string
;
1397 switch (ELF_ST_VISIBILITY (h
->other
))
1400 v
= _("hidden symbol ");
1403 v
= _("internal symbol ");
1406 v
= _("protected symbol ");
1409 if (((struct elf_x86_link_hash_entry
*) h
)->def_protected
)
1410 v
= _("protected symbol ");
1417 if (!SYMBOL_DEFINED_NON_SHARED_P (h
) && !h
->def_dynamic
)
1418 und
= _("undefined ");
1422 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, isym
, NULL
);
1426 if (bfd_link_dll (info
))
1428 object
= _("a shared object");
1430 pic
= _("; recompile with -fPIC");
1434 if (bfd_link_pie (info
))
1435 object
= _("a PIE object");
1437 object
= _("a PDE object");
1439 pic
= _("; recompile with -fPIE");
1442 /* xgettext:c-format */
1443 _bfd_error_handler (_("%pB: relocation %s against %s%s`%s' can "
1444 "not be used when making %s%s"),
1445 input_bfd
, howto
->name
, und
, v
, name
,
1447 bfd_set_error (bfd_error_bad_value
);
1448 sec
->check_relocs_failed
= 1;
1452 /* With the local symbol, foo, we convert
1453 mov foo@GOTPCREL(%rip), %reg
1457 call/jmp *foo@GOTPCREL(%rip)
1459 nop call foo/jmp foo nop
1460 When PIC is false, convert
1461 test %reg, foo@GOTPCREL(%rip)
1465 binop foo@GOTPCREL(%rip), %reg
1468 where binop is one of adc, add, and, cmp, or, sbb, sub, xor
1472 elf_x86_64_convert_load_reloc (bfd
*abfd
,
1474 unsigned int *r_type_p
,
1475 Elf_Internal_Rela
*irel
,
1476 struct elf_link_hash_entry
*h
,
1478 struct bfd_link_info
*link_info
)
1480 struct elf_x86_link_hash_table
*htab
;
1488 bfd_signed_vma raddend
;
1489 unsigned int opcode
;
1491 unsigned int r_type
= *r_type_p
;
1492 unsigned int r_symndx
;
1493 bfd_vma roff
= irel
->r_offset
;
1494 bfd_vma abs_relocation
;
1496 if (roff
< (r_type
== R_X86_64_REX_GOTPCRELX
? 3 : 2))
1499 raddend
= irel
->r_addend
;
1500 /* Addend for 32-bit PC-relative relocation must be -4. */
1504 htab
= elf_x86_hash_table (link_info
, X86_64_ELF_DATA
);
1505 is_pic
= bfd_link_pic (link_info
);
1507 relocx
= (r_type
== R_X86_64_GOTPCRELX
1508 || r_type
== R_X86_64_REX_GOTPCRELX
);
1510 /* TRUE if --no-relax is used. */
1511 no_overflow
= link_info
->disable_target_specific_optimizations
> 1;
1513 r_symndx
= htab
->r_sym (irel
->r_info
);
1515 opcode
= bfd_get_8 (abfd
, contents
+ roff
- 2);
1517 /* Convert mov to lea since it has been done for a while. */
1520 /* Only convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX
1521 for call, jmp or one of adc, add, and, cmp, or, sbb, sub,
1522 test, xor instructions. */
1527 /* We convert only to R_X86_64_PC32:
1529 2. R_X86_64_GOTPCREL since we can't modify REX byte.
1530 3. no_overflow is true.
1533 to_reloc_pc32
= (opcode
== 0xff
1541 /* Get the symbol referred to by the reloc. */
1544 Elf_Internal_Sym
*isym
1545 = bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
, abfd
, r_symndx
);
1547 /* Skip relocation against undefined symbols. */
1548 if (isym
->st_shndx
== SHN_UNDEF
)
1552 if (isym
->st_shndx
== SHN_ABS
)
1554 tsec
= bfd_abs_section_ptr
;
1556 abs_relocation
= isym
->st_value
;
1558 else if (isym
->st_shndx
== SHN_COMMON
)
1559 tsec
= bfd_com_section_ptr
;
1560 else if (isym
->st_shndx
== SHN_X86_64_LCOMMON
)
1561 tsec
= &_bfd_elf_large_com_section
;
1563 tsec
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
1567 /* Undefined weak symbol is only bound locally in executable
1568 and its reference is resolved as 0 without relocation
1569 overflow. We can only perform this optimization for
1570 GOTPCRELX relocations since we need to modify REX byte.
1571 It is OK convert mov with R_X86_64_GOTPCREL to
1573 struct elf_x86_link_hash_entry
*eh
= elf_x86_hash_entry (h
);
1575 abs_symbol
= ABS_SYMBOL_P (h
);
1576 abs_relocation
= h
->root
.u
.def
.value
;
1578 /* NB: Also set linker_def via SYMBOL_REFERENCES_LOCAL_P. */
1579 local_ref
= SYMBOL_REFERENCES_LOCAL_P (link_info
, h
);
1580 if ((relocx
|| opcode
== 0x8b)
1581 && (h
->root
.type
== bfd_link_hash_undefweak
1587 /* Skip for branch instructions since R_X86_64_PC32
1594 /* For non-branch instructions, we can convert to
1595 R_X86_64_32/R_X86_64_32S since we know if there
1597 to_reloc_pc32
= false;
1600 /* Since we don't know the current PC when PIC is true,
1601 we can't convert to R_X86_64_PC32. */
1602 if (to_reloc_pc32
&& is_pic
)
1607 /* Avoid optimizing GOTPCREL relocations againt _DYNAMIC since
1608 ld.so may use its link-time address. */
1609 else if (h
->start_stop
1612 || h
->root
.type
== bfd_link_hash_defined
1613 || h
->root
.type
== bfd_link_hash_defweak
)
1614 && h
!= htab
->elf
.hdynamic
1617 /* bfd_link_hash_new or bfd_link_hash_undefined is
1618 set by an assignment in a linker script in
1619 bfd_elf_record_link_assignment. start_stop is set
1620 on __start_SECNAME/__stop_SECNAME which mark section
1625 && (h
->root
.type
== bfd_link_hash_new
1626 || h
->root
.type
== bfd_link_hash_undefined
1627 || ((h
->root
.type
== bfd_link_hash_defined
1628 || h
->root
.type
== bfd_link_hash_defweak
)
1629 && h
->root
.u
.def
.section
== bfd_und_section_ptr
))))
1631 /* Skip since R_X86_64_32/R_X86_64_32S may overflow. */
1636 tsec
= h
->root
.u
.def
.section
;
1642 /* Don't convert GOTPCREL relocation against large section. */
1643 if (elf_section_data (tsec
) != NULL
1644 && (elf_section_flags (tsec
) & SHF_X86_64_LARGE
) != 0)
1647 /* Skip since R_X86_64_PC32/R_X86_64_32/R_X86_64_32S may overflow. */
1654 /* We have "call/jmp *foo@GOTPCREL(%rip)". */
1659 /* Convert R_X86_64_GOTPCRELX and R_X86_64_REX_GOTPCRELX to
1661 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1664 /* Convert to "jmp foo nop". */
1667 nop_offset
= irel
->r_offset
+ 3;
1668 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
1669 irel
->r_offset
-= 1;
1670 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
1674 struct elf_x86_link_hash_entry
*eh
1675 = (struct elf_x86_link_hash_entry
*) h
;
1677 /* Convert to "nop call foo". ADDR_PREFIX_OPCODE
1680 /* To support TLS optimization, always use addr32 prefix for
1681 "call *__tls_get_addr@GOTPCREL(%rip)". */
1682 if (eh
&& eh
->tls_get_addr
)
1685 nop_offset
= irel
->r_offset
- 2;
1689 nop
= htab
->params
->call_nop_byte
;
1690 if (htab
->params
->call_nop_as_suffix
)
1692 nop_offset
= irel
->r_offset
+ 3;
1693 disp
= bfd_get_32 (abfd
, contents
+ irel
->r_offset
);
1694 irel
->r_offset
-= 1;
1695 bfd_put_32 (abfd
, disp
, contents
+ irel
->r_offset
);
1698 nop_offset
= irel
->r_offset
- 2;
1701 bfd_put_8 (abfd
, nop
, contents
+ nop_offset
);
1702 bfd_put_8 (abfd
, modrm
, contents
+ irel
->r_offset
- 1);
1703 r_type
= R_X86_64_PC32
;
1708 unsigned int rex_mask
= REX_R
;
1710 if (r_type
== R_X86_64_REX_GOTPCRELX
)
1711 rex
= bfd_get_8 (abfd
, contents
+ roff
- 3);
1717 if (abs_symbol
&& local_ref
&& relocx
)
1718 to_reloc_pc32
= false;
1722 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1723 "lea foo(%rip), %reg". */
1725 r_type
= R_X86_64_PC32
;
1729 /* Convert "mov foo@GOTPCREL(%rip), %reg" to
1730 "mov $foo, %reg". */
1732 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1733 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1734 if ((rex
& REX_W
) != 0
1735 && ABI_64_P (link_info
->output_bfd
))
1737 /* Keep the REX_W bit in REX byte for LP64. */
1738 r_type
= R_X86_64_32S
;
1739 goto rewrite_modrm_rex
;
1743 /* If the REX_W bit in REX byte isn't needed,
1744 use R_X86_64_32 and clear the W bit to avoid
1745 sign-extend imm32 to imm64. */
1746 r_type
= R_X86_64_32
;
1747 /* Clear the W bit in REX byte. */
1749 goto rewrite_modrm_rex
;
1755 /* R_X86_64_PC32 isn't supported. */
1759 modrm
= bfd_get_8 (abfd
, contents
+ roff
- 1);
1762 /* Convert "test %reg, foo@GOTPCREL(%rip)" to
1763 "test $foo, %reg". */
1764 modrm
= 0xc0 | (modrm
& 0x38) >> 3;
1769 /* Convert "binop foo@GOTPCREL(%rip), %reg" to
1770 "binop $foo, %reg". */
1771 modrm
= 0xc0 | (modrm
& 0x38) >> 3 | (opcode
& 0x3c);
1775 /* Use R_X86_64_32 with 32-bit operand to avoid relocation
1776 overflow when sign-extending imm32 to imm64. */
1777 r_type
= (rex
& REX_W
) != 0 ? R_X86_64_32S
: R_X86_64_32
;
1782 /* Check if R_X86_64_32S/R_X86_64_32 fits. */
1783 if (r_type
== R_X86_64_32S
)
1785 if ((abs_relocation
+ 0x80000000) > 0xffffffff)
1790 if (abs_relocation
> 0xffffffff)
1795 bfd_put_8 (abfd
, modrm
, contents
+ roff
- 1);
1799 /* Move the R bit to the B bit in REX byte. */
1800 rex
= (rex
& ~rex_mask
) | (rex
& REX_R
) >> 2;
1801 bfd_put_8 (abfd
, rex
, contents
+ roff
- 3);
1804 /* No addend for R_X86_64_32/R_X86_64_32S relocations. */
1808 bfd_put_8 (abfd
, opcode
, contents
+ roff
- 2);
1812 irel
->r_info
= htab
->r_info (r_symndx
,
1813 r_type
| R_X86_64_converted_reloc_bit
);
1820 /* Look through the relocs for a section during the first phase, and
1821 calculate needed space in the global offset table, and procedure
1825 elf_x86_64_scan_relocs (bfd
*abfd
, struct bfd_link_info
*info
,
1827 const Elf_Internal_Rela
*relocs
)
1829 struct elf_x86_link_hash_table
*htab
;
1830 Elf_Internal_Shdr
*symtab_hdr
;
1831 struct elf_link_hash_entry
**sym_hashes
;
1832 const Elf_Internal_Rela
*rel
;
1833 const Elf_Internal_Rela
*rel_end
;
1837 if (bfd_link_relocatable (info
))
1840 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
1843 sec
->check_relocs_failed
= 1;
1847 BFD_ASSERT (is_x86_elf (abfd
, htab
));
1849 /* Get the section contents. */
1850 if (elf_section_data (sec
)->this_hdr
.contents
!= NULL
)
1851 contents
= elf_section_data (sec
)->this_hdr
.contents
;
1852 else if (!bfd_malloc_and_get_section (abfd
, sec
, &contents
))
1854 sec
->check_relocs_failed
= 1;
1858 symtab_hdr
= &elf_symtab_hdr (abfd
);
1859 sym_hashes
= elf_sym_hashes (abfd
);
1863 rel_end
= relocs
+ sec
->reloc_count
;
1864 for (rel
= relocs
; rel
< rel_end
; rel
++)
1866 unsigned int r_type
;
1867 unsigned int r_symndx
;
1868 struct elf_link_hash_entry
*h
;
1869 struct elf_x86_link_hash_entry
*eh
;
1870 Elf_Internal_Sym
*isym
;
1873 bool converted_reloc
;
1876 r_symndx
= htab
->r_sym (rel
->r_info
);
1877 r_type
= ELF32_R_TYPE (rel
->r_info
);
1879 if (r_symndx
>= NUM_SHDR_ENTRIES (symtab_hdr
))
1881 /* xgettext:c-format */
1882 _bfd_error_handler (_("%pB: bad symbol index: %d"),
1887 if (r_symndx
< symtab_hdr
->sh_info
)
1889 /* A local symbol. */
1890 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
1895 /* Check relocation against local STT_GNU_IFUNC symbol. */
1896 if (ELF_ST_TYPE (isym
->st_info
) == STT_GNU_IFUNC
)
1898 h
= _bfd_elf_x86_get_local_sym_hash (htab
, abfd
, rel
,
1903 /* Fake a STT_GNU_IFUNC symbol. */
1904 h
->root
.root
.string
= bfd_elf_sym_name (abfd
, symtab_hdr
,
1906 h
->type
= STT_GNU_IFUNC
;
1909 h
->forced_local
= 1;
1910 h
->root
.type
= bfd_link_hash_defined
;
1918 h
= sym_hashes
[r_symndx
- symtab_hdr
->sh_info
];
1919 while (h
->root
.type
== bfd_link_hash_indirect
1920 || h
->root
.type
== bfd_link_hash_warning
)
1921 h
= (struct elf_link_hash_entry
*) h
->root
.u
.i
.link
;
1924 /* Check invalid x32 relocations. */
1925 if (!ABI_64_P (abfd
))
1931 case R_X86_64_DTPOFF64
:
1932 case R_X86_64_TPOFF64
:
1934 case R_X86_64_GOTOFF64
:
1935 case R_X86_64_GOT64
:
1936 case R_X86_64_GOTPCREL64
:
1937 case R_X86_64_GOTPC64
:
1938 case R_X86_64_GOTPLT64
:
1939 case R_X86_64_PLTOFF64
:
1942 name
= h
->root
.root
.string
;
1944 name
= bfd_elf_sym_name (abfd
, symtab_hdr
, isym
,
1947 /* xgettext:c-format */
1948 (_("%pB: relocation %s against symbol `%s' isn't "
1949 "supported in x32 mode"), abfd
,
1950 x86_64_elf_howto_table
[r_type
].name
, name
);
1951 bfd_set_error (bfd_error_bad_value
);
1957 eh
= (struct elf_x86_link_hash_entry
*) h
;
1961 /* It is referenced by a non-shared object. */
1965 converted_reloc
= false;
1966 if ((r_type
== R_X86_64_GOTPCREL
1967 || r_type
== R_X86_64_GOTPCRELX
1968 || r_type
== R_X86_64_REX_GOTPCRELX
)
1969 && (h
== NULL
|| h
->type
!= STT_GNU_IFUNC
))
1971 Elf_Internal_Rela
*irel
= (Elf_Internal_Rela
*) rel
;
1972 if (!elf_x86_64_convert_load_reloc (abfd
, contents
, &r_type
,
1973 irel
, h
, &converted_reloc
,
1977 if (converted_reloc
)
1981 if (!_bfd_elf_x86_valid_reloc_p (sec
, info
, htab
, rel
, h
, isym
,
1982 symtab_hdr
, &no_dynreloc
))
1985 if (! elf_x86_64_tls_transition (info
, abfd
, sec
, contents
,
1986 symtab_hdr
, sym_hashes
,
1987 &r_type
, GOT_UNKNOWN
,
1988 rel
, rel_end
, h
, r_symndx
, false))
1991 /* Check if _GLOBAL_OFFSET_TABLE_ is referenced. */
1992 if (h
== htab
->elf
.hgot
)
1993 htab
->got_referenced
= true;
1997 case R_X86_64_TLSLD
:
1998 htab
->tls_ld_or_ldm_got
.refcount
= 1;
2001 case R_X86_64_TPOFF32
:
2002 if (!bfd_link_executable (info
) && ABI_64_P (abfd
))
2003 return elf_x86_64_need_pic (info
, abfd
, sec
, h
, symtab_hdr
, isym
,
2004 &x86_64_elf_howto_table
[r_type
]);
2006 eh
->zero_undefweak
&= 0x2;
2009 case R_X86_64_GOTTPOFF
:
2010 if (!bfd_link_executable (info
))
2011 info
->flags
|= DF_STATIC_TLS
;
2014 case R_X86_64_GOT32
:
2015 case R_X86_64_GOTPCREL
:
2016 case R_X86_64_GOTPCRELX
:
2017 case R_X86_64_REX_GOTPCRELX
:
2018 case R_X86_64_TLSGD
:
2019 case R_X86_64_GOT64
:
2020 case R_X86_64_GOTPCREL64
:
2021 case R_X86_64_GOTPLT64
:
2022 case R_X86_64_GOTPC32_TLSDESC
:
2023 case R_X86_64_TLSDESC_CALL
:
2024 /* This symbol requires a global offset table entry. */
2026 int tls_type
, old_tls_type
;
2031 tls_type
= GOT_NORMAL
;
2034 if (ABS_SYMBOL_P (h
))
2037 else if (isym
->st_shndx
== SHN_ABS
)
2040 case R_X86_64_TLSGD
:
2041 tls_type
= GOT_TLS_GD
;
2043 case R_X86_64_GOTTPOFF
:
2044 tls_type
= GOT_TLS_IE
;
2046 case R_X86_64_GOTPC32_TLSDESC
:
2047 case R_X86_64_TLSDESC_CALL
:
2048 tls_type
= GOT_TLS_GDESC
;
2054 h
->got
.refcount
= 1;
2055 old_tls_type
= eh
->tls_type
;
2059 bfd_signed_vma
*local_got_refcounts
;
2061 if (!elf_x86_allocate_local_got_info (abfd
,
2062 symtab_hdr
->sh_info
))
2065 /* This is a global offset table entry for a local symbol. */
2066 local_got_refcounts
= elf_local_got_refcounts (abfd
);
2067 local_got_refcounts
[r_symndx
] = 1;
2069 = elf_x86_local_got_tls_type (abfd
) [r_symndx
];
2072 /* If a TLS symbol is accessed using IE at least once,
2073 there is no point to use dynamic model for it. */
2074 if (old_tls_type
!= tls_type
&& old_tls_type
!= GOT_UNKNOWN
2075 && (! GOT_TLS_GD_ANY_P (old_tls_type
)
2076 || tls_type
!= GOT_TLS_IE
))
2078 if (old_tls_type
== GOT_TLS_IE
&& GOT_TLS_GD_ANY_P (tls_type
))
2079 tls_type
= old_tls_type
;
2080 else if (GOT_TLS_GD_ANY_P (old_tls_type
)
2081 && GOT_TLS_GD_ANY_P (tls_type
))
2082 tls_type
|= old_tls_type
;
2086 name
= h
->root
.root
.string
;
2088 name
= bfd_elf_sym_name (abfd
, symtab_hdr
,
2091 /* xgettext:c-format */
2092 (_("%pB: '%s' accessed both as normal and"
2093 " thread local symbol"),
2095 bfd_set_error (bfd_error_bad_value
);
2100 if (old_tls_type
!= tls_type
)
2103 eh
->tls_type
= tls_type
;
2105 elf_x86_local_got_tls_type (abfd
) [r_symndx
] = tls_type
;
2110 case R_X86_64_GOTOFF64
:
2111 case R_X86_64_GOTPC32
:
2112 case R_X86_64_GOTPC64
:
2115 eh
->zero_undefweak
&= 0x2;
2118 case R_X86_64_PLT32
:
2119 case R_X86_64_PLT32_BND
:
2120 /* This symbol requires a procedure linkage table entry. We
2121 actually build the entry in adjust_dynamic_symbol,
2122 because this might be a case of linking PIC code which is
2123 never referenced by a dynamic object, in which case we
2124 don't need to generate a procedure linkage table entry
2127 /* If this is a local symbol, we resolve it directly without
2128 creating a procedure linkage table entry. */
2132 eh
->zero_undefweak
&= 0x2;
2134 h
->plt
.refcount
= 1;
2137 case R_X86_64_PLTOFF64
:
2138 /* This tries to form the 'address' of a function relative
2139 to GOT. For global symbols we need a PLT entry. */
2143 h
->plt
.refcount
= 1;
2147 case R_X86_64_SIZE32
:
2148 case R_X86_64_SIZE64
:
2153 if (!ABI_64_P (abfd
))
2159 /* Check relocation overflow as these relocs may lead to
2160 run-time relocation overflow. Don't error out for
2161 sections we don't care about, such as debug sections or
2162 when relocation overflow check is disabled. */
2163 if (!htab
->params
->no_reloc_overflow_check
2165 && (bfd_link_pic (info
)
2166 || (bfd_link_executable (info
)
2170 && (sec
->flags
& SEC_READONLY
) == 0)))
2171 return elf_x86_64_need_pic (info
, abfd
, sec
, h
, symtab_hdr
, isym
,
2172 &x86_64_elf_howto_table
[r_type
]);
2178 case R_X86_64_PC32_BND
:
2182 if (eh
!= NULL
&& (sec
->flags
& SEC_CODE
) != 0)
2183 eh
->zero_undefweak
|= 0x2;
2184 /* We are called after all symbols have been resolved. Only
2185 relocation against STT_GNU_IFUNC symbol must go through
2188 && (bfd_link_executable (info
)
2189 || h
->type
== STT_GNU_IFUNC
))
2191 bool func_pointer_ref
= false;
2193 if (r_type
== R_X86_64_PC32
)
2195 /* Since something like ".long foo - ." may be used
2196 as pointer, make sure that PLT is used if foo is
2197 a function defined in a shared library. */
2198 if ((sec
->flags
& SEC_CODE
) == 0)
2200 h
->pointer_equality_needed
= 1;
2201 if (bfd_link_pie (info
)
2202 && h
->type
== STT_FUNC
2207 h
->plt
.refcount
= 1;
2211 else if (r_type
!= R_X86_64_PC32_BND
2212 && r_type
!= R_X86_64_PC64
)
2214 /* At run-time, R_X86_64_64 can be resolved for both
2215 x86-64 and x32. But R_X86_64_32 and R_X86_64_32S
2216 can only be resolved for x32. Function pointer
2217 reference doesn't need PLT for pointer equality. */
2218 if ((sec
->flags
& SEC_READONLY
) == 0
2219 && (r_type
== R_X86_64_64
2220 || (!ABI_64_P (abfd
)
2221 && (r_type
== R_X86_64_32
2222 || r_type
== R_X86_64_32S
))))
2223 func_pointer_ref
= true;
2225 h
->pointer_equality_needed
= 1;
2228 if (!func_pointer_ref
)
2230 /* If this reloc is in a read-only section, we might
2231 need a copy reloc. We can't check reliably at this
2232 stage whether the section is read-only, as input
2233 sections have not yet been mapped to output sections.
2234 Tentatively set the flag for now, and correct in
2235 adjust_dynamic_symbol. */
2238 if (!elf_has_indirect_extern_access (sec
->owner
))
2239 eh
->non_got_ref_without_indirect_extern_access
= 1;
2241 /* We may need a .plt entry if the symbol is a function
2242 defined in a shared lib or is a function referenced
2243 from the code or read-only section. */
2245 || (sec
->flags
& (SEC_CODE
| SEC_READONLY
)) != 0)
2246 h
->plt
.refcount
= 1;
2248 if (h
->pointer_equality_needed
2249 && h
->type
== STT_FUNC
2250 && eh
->def_protected
2251 && elf_has_indirect_extern_access (h
->root
.u
.def
.section
->owner
))
2253 /* Disallow non-canonical reference to canonical
2254 protected function. */
2256 /* xgettext:c-format */
2257 (_("%pB: non-canonical reference to canonical "
2258 "protected function `%s' in %pB"),
2259 abfd
, h
->root
.root
.string
,
2260 h
->root
.u
.def
.section
->owner
);
2261 bfd_set_error (bfd_error_bad_value
);
2270 && NEED_DYNAMIC_RELOCATION_P (true, info
, true, h
, sec
,
2272 htab
->pointer_r_type
))
2274 struct elf_dyn_relocs
*p
;
2275 struct elf_dyn_relocs
**head
;
2277 /* If this is a global symbol, we count the number of
2278 relocations we need for this symbol. */
2280 head
= &h
->dyn_relocs
;
2283 /* Track dynamic relocs needed for local syms too.
2284 We really need local syms available to do this
2289 isym
= bfd_sym_from_r_symndx (&htab
->elf
.sym_cache
,
2294 s
= bfd_section_from_elf_index (abfd
, isym
->st_shndx
);
2298 /* Beware of type punned pointers vs strict aliasing
2300 vpp
= &(elf_section_data (s
)->local_dynrel
);
2301 head
= (struct elf_dyn_relocs
**)vpp
;
2305 if (p
== NULL
|| p
->sec
!= sec
)
2307 size_t amt
= sizeof *p
;
2309 p
= ((struct elf_dyn_relocs
*)
2310 bfd_alloc (htab
->elf
.dynobj
, amt
));
2321 /* Count size relocation as PC-relative relocation. */
2322 if (X86_PCREL_TYPE_P (true, r_type
) || size_reloc
)
2327 /* This relocation describes the C++ object vtable hierarchy.
2328 Reconstruct it for later use during GC. */
2329 case R_X86_64_GNU_VTINHERIT
:
2330 if (!bfd_elf_gc_record_vtinherit (abfd
, sec
, h
, rel
->r_offset
))
2334 /* This relocation describes which C++ vtable entries are actually
2335 used. Record for later use during GC. */
2336 case R_X86_64_GNU_VTENTRY
:
2337 if (!bfd_elf_gc_record_vtentry (abfd
, sec
, h
, rel
->r_addend
))
2346 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2348 if (!converted
&& !_bfd_link_keep_memory (info
))
2352 /* Cache the section contents for elf_link_input_bfd if any
2353 load is converted or --no-keep-memory isn't used. */
2354 elf_section_data (sec
)->this_hdr
.contents
= contents
;
2355 info
->cache_size
+= sec
->size
;
2359 /* Cache relocations if any load is converted. */
2360 if (elf_section_data (sec
)->relocs
!= relocs
&& converted
)
2361 elf_section_data (sec
)->relocs
= (Elf_Internal_Rela
*) relocs
;
2366 if (elf_section_data (sec
)->this_hdr
.contents
!= contents
)
2368 sec
->check_relocs_failed
= 1;
2373 elf_x86_64_always_size_sections (bfd
*output_bfd
,
2374 struct bfd_link_info
*info
)
2378 /* Scan relocations after rel_from_abs has been set on __ehdr_start. */
2379 for (abfd
= info
->input_bfds
;
2380 abfd
!= (bfd
*) NULL
;
2381 abfd
= abfd
->link
.next
)
2382 if (bfd_get_flavour (abfd
) == bfd_target_elf_flavour
2383 && !_bfd_elf_link_iterate_on_relocs (abfd
, info
,
2384 elf_x86_64_scan_relocs
))
2387 return _bfd_x86_elf_always_size_sections (output_bfd
, info
);
2390 /* Return the relocation value for @tpoff relocation
2391 if STT_TLS virtual address is ADDRESS. */
2394 elf_x86_64_tpoff (struct bfd_link_info
*info
, bfd_vma address
)
2396 struct elf_link_hash_table
*htab
= elf_hash_table (info
);
2397 const struct elf_backend_data
*bed
= get_elf_backend_data (info
->output_bfd
);
2398 bfd_vma static_tls_size
;
2400 /* If tls_segment is NULL, we should have signalled an error already. */
2401 if (htab
->tls_sec
== NULL
)
2404 /* Consider special static TLS alignment requirements. */
2405 static_tls_size
= BFD_ALIGN (htab
->tls_size
, bed
->static_tls_alignment
);
2406 return address
- static_tls_size
- htab
->tls_sec
->vma
;
2409 /* Relocate an x86_64 ELF section. */
2412 elf_x86_64_relocate_section (bfd
*output_bfd
,
2413 struct bfd_link_info
*info
,
2415 asection
*input_section
,
2417 Elf_Internal_Rela
*relocs
,
2418 Elf_Internal_Sym
*local_syms
,
2419 asection
**local_sections
)
2421 struct elf_x86_link_hash_table
*htab
;
2422 Elf_Internal_Shdr
*symtab_hdr
;
2423 struct elf_link_hash_entry
**sym_hashes
;
2424 bfd_vma
*local_got_offsets
;
2425 bfd_vma
*local_tlsdesc_gotents
;
2426 Elf_Internal_Rela
*rel
;
2427 Elf_Internal_Rela
*wrel
;
2428 Elf_Internal_Rela
*relend
;
2429 unsigned int plt_entry_size
;
2432 /* Skip if check_relocs or scan_relocs failed. */
2433 if (input_section
->check_relocs_failed
)
2436 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
2440 if (!is_x86_elf (input_bfd
, htab
))
2442 bfd_set_error (bfd_error_wrong_format
);
2446 plt_entry_size
= htab
->plt
.plt_entry_size
;
2447 symtab_hdr
= &elf_symtab_hdr (input_bfd
);
2448 sym_hashes
= elf_sym_hashes (input_bfd
);
2449 local_got_offsets
= elf_local_got_offsets (input_bfd
);
2450 local_tlsdesc_gotents
= elf_x86_local_tlsdesc_gotent (input_bfd
);
2452 _bfd_x86_elf_set_tls_module_base (info
);
2455 rel
= wrel
= relocs
;
2456 relend
= relocs
+ input_section
->reloc_count
;
2457 for (; rel
< relend
; wrel
++, rel
++)
2459 unsigned int r_type
, r_type_tls
;
2460 reloc_howto_type
*howto
;
2461 unsigned long r_symndx
;
2462 struct elf_link_hash_entry
*h
;
2463 struct elf_x86_link_hash_entry
*eh
;
2464 Elf_Internal_Sym
*sym
;
2466 bfd_vma off
, offplt
, plt_offset
;
2468 bool unresolved_reloc
;
2469 bfd_reloc_status_type r
;
2471 asection
*base_got
, *resolved_plt
;
2473 bool resolved_to_zero
;
2474 bool relative_reloc
;
2475 bool converted_reloc
;
2476 bool need_copy_reloc_in_pie
;
2477 bool no_copyreloc_p
;
2479 r_type
= ELF32_R_TYPE (rel
->r_info
);
2480 if (r_type
== (int) R_X86_64_GNU_VTINHERIT
2481 || r_type
== (int) R_X86_64_GNU_VTENTRY
)
2488 r_symndx
= htab
->r_sym (rel
->r_info
);
2489 converted_reloc
= (r_type
& R_X86_64_converted_reloc_bit
) != 0;
2490 if (converted_reloc
)
2492 r_type
&= ~R_X86_64_converted_reloc_bit
;
2493 rel
->r_info
= htab
->r_info (r_symndx
, r_type
);
2496 howto
= elf_x86_64_rtype_to_howto (input_bfd
, r_type
);
2498 return _bfd_unrecognized_reloc (input_bfd
, input_section
, r_type
);
2503 unresolved_reloc
= false;
2504 if (r_symndx
< symtab_hdr
->sh_info
)
2506 sym
= local_syms
+ r_symndx
;
2507 sec
= local_sections
[r_symndx
];
2509 relocation
= _bfd_elf_rela_local_sym (output_bfd
, sym
,
2511 st_size
= sym
->st_size
;
2513 /* Relocate against local STT_GNU_IFUNC symbol. */
2514 if (!bfd_link_relocatable (info
)
2515 && ELF_ST_TYPE (sym
->st_info
) == STT_GNU_IFUNC
)
2517 h
= _bfd_elf_x86_get_local_sym_hash (htab
, input_bfd
,
2522 /* Set STT_GNU_IFUNC symbol value. */
2523 h
->root
.u
.def
.value
= sym
->st_value
;
2524 h
->root
.u
.def
.section
= sec
;
2529 bool warned ATTRIBUTE_UNUSED
;
2530 bool ignored ATTRIBUTE_UNUSED
;
2532 RELOC_FOR_GLOBAL_SYMBOL (info
, input_bfd
, input_section
, rel
,
2533 r_symndx
, symtab_hdr
, sym_hashes
,
2535 unresolved_reloc
, warned
, ignored
);
2539 if (sec
!= NULL
&& discarded_section (sec
))
2541 _bfd_clear_contents (howto
, input_bfd
, input_section
,
2542 contents
, rel
->r_offset
);
2543 wrel
->r_offset
= rel
->r_offset
;
2547 /* For ld -r, remove relocations in debug sections against
2548 sections defined in discarded sections. Not done for
2549 eh_frame editing code expects to be present. */
2550 if (bfd_link_relocatable (info
)
2551 && (input_section
->flags
& SEC_DEBUGGING
))
2557 if (bfd_link_relocatable (info
))
2564 if (rel
->r_addend
== 0 && !ABI_64_P (output_bfd
))
2566 if (r_type
== R_X86_64_64
)
2568 /* For x32, treat R_X86_64_64 like R_X86_64_32 and
2569 zero-extend it to 64bit if addend is zero. */
2570 r_type
= R_X86_64_32
;
2571 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
2573 else if (r_type
== R_X86_64_SIZE64
)
2575 /* For x32, treat R_X86_64_SIZE64 like R_X86_64_SIZE32 and
2576 zero-extend it to 64bit if addend is zero. */
2577 r_type
= R_X86_64_SIZE32
;
2578 memset (contents
+ rel
->r_offset
+ 4, 0, 4);
2582 eh
= (struct elf_x86_link_hash_entry
*) h
;
2584 /* Since STT_GNU_IFUNC symbol must go through PLT, we handle
2585 it here if it is defined in a non-shared object. */
2587 && h
->type
== STT_GNU_IFUNC
2593 if ((input_section
->flags
& SEC_ALLOC
) == 0)
2595 /* If this is a SHT_NOTE section without SHF_ALLOC, treat
2596 STT_GNU_IFUNC symbol as STT_FUNC. */
2597 if (elf_section_type (input_section
) == SHT_NOTE
)
2599 /* Dynamic relocs are not propagated for SEC_DEBUGGING
2600 sections because such sections are not SEC_ALLOC and
2601 thus ld.so will not process them. */
2602 if ((input_section
->flags
& SEC_DEBUGGING
) != 0)
2612 case R_X86_64_GOTPCREL
:
2613 case R_X86_64_GOTPCRELX
:
2614 case R_X86_64_REX_GOTPCRELX
:
2615 case R_X86_64_GOTPCREL64
:
2616 base_got
= htab
->elf
.sgot
;
2617 off
= h
->got
.offset
;
2619 if (base_got
== NULL
)
2622 if (off
== (bfd_vma
) -1)
2624 /* We can't use h->got.offset here to save state, or
2625 even just remember the offset, as finish_dynamic_symbol
2626 would use that as offset into .got. */
2628 if (h
->plt
.offset
== (bfd_vma
) -1)
2631 if (htab
->elf
.splt
!= NULL
)
2633 plt_index
= (h
->plt
.offset
/ plt_entry_size
2634 - htab
->plt
.has_plt0
);
2635 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2636 base_got
= htab
->elf
.sgotplt
;
2640 plt_index
= h
->plt
.offset
/ plt_entry_size
;
2641 off
= plt_index
* GOT_ENTRY_SIZE
;
2642 base_got
= htab
->elf
.igotplt
;
2645 if (h
->dynindx
== -1
2649 /* This references the local defitionion. We must
2650 initialize this entry in the global offset table.
2651 Since the offset must always be a multiple of 8,
2652 we use the least significant bit to record
2653 whether we have initialized it already.
2655 When doing a dynamic link, we create a .rela.got
2656 relocation entry to initialize the value. This
2657 is done in the finish_dynamic_symbol routine. */
2662 bfd_put_64 (output_bfd
, relocation
,
2663 base_got
->contents
+ off
);
2664 /* Note that this is harmless for the GOTPLT64
2665 case, as -1 | 1 still is -1. */
2671 relocation
= (base_got
->output_section
->vma
2672 + base_got
->output_offset
+ off
);
2677 if (h
->plt
.offset
== (bfd_vma
) -1)
2679 /* Handle static pointers of STT_GNU_IFUNC symbols. */
2680 if (r_type
== htab
->pointer_r_type
2681 && (input_section
->flags
& SEC_CODE
) == 0)
2682 goto do_ifunc_pointer
;
2683 goto bad_ifunc_reloc
;
2686 /* STT_GNU_IFUNC symbol must go through PLT. */
2687 if (htab
->elf
.splt
!= NULL
)
2689 if (htab
->plt_second
!= NULL
)
2691 resolved_plt
= htab
->plt_second
;
2692 plt_offset
= eh
->plt_second
.offset
;
2696 resolved_plt
= htab
->elf
.splt
;
2697 plt_offset
= h
->plt
.offset
;
2702 resolved_plt
= htab
->elf
.iplt
;
2703 plt_offset
= h
->plt
.offset
;
2706 relocation
= (resolved_plt
->output_section
->vma
2707 + resolved_plt
->output_offset
+ plt_offset
);
2713 if (h
->root
.root
.string
)
2714 name
= h
->root
.root
.string
;
2716 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
, sym
,
2719 /* xgettext:c-format */
2720 (_("%pB: relocation %s against STT_GNU_IFUNC "
2721 "symbol `%s' isn't supported"), input_bfd
,
2723 bfd_set_error (bfd_error_bad_value
);
2727 if (bfd_link_pic (info
))
2732 if (ABI_64_P (output_bfd
))
2737 if (rel
->r_addend
!= 0)
2739 if (h
->root
.root
.string
)
2740 name
= h
->root
.root
.string
;
2742 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
2745 /* xgettext:c-format */
2746 (_("%pB: relocation %s against STT_GNU_IFUNC "
2747 "symbol `%s' has non-zero addend: %" PRId64
),
2748 input_bfd
, howto
->name
, name
, (int64_t) rel
->r_addend
);
2749 bfd_set_error (bfd_error_bad_value
);
2753 /* Generate dynamic relcoation only when there is a
2754 non-GOT reference in a shared object or there is no
2756 if ((bfd_link_pic (info
) && h
->non_got_ref
)
2757 || h
->plt
.offset
== (bfd_vma
) -1)
2759 Elf_Internal_Rela outrel
;
2762 /* Need a dynamic relocation to get the real function
2764 outrel
.r_offset
= _bfd_elf_section_offset (output_bfd
,
2768 if (outrel
.r_offset
== (bfd_vma
) -1
2769 || outrel
.r_offset
== (bfd_vma
) -2)
2772 outrel
.r_offset
+= (input_section
->output_section
->vma
2773 + input_section
->output_offset
);
2775 if (POINTER_LOCAL_IFUNC_P (info
, h
))
2777 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
2778 h
->root
.root
.string
,
2779 h
->root
.u
.def
.section
->owner
);
2781 /* This symbol is resolved locally. */
2782 outrel
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
2783 outrel
.r_addend
= (h
->root
.u
.def
.value
2784 + h
->root
.u
.def
.section
->output_section
->vma
2785 + h
->root
.u
.def
.section
->output_offset
);
2787 if (htab
->params
->report_relative_reloc
)
2788 _bfd_x86_elf_link_report_relative_reloc
2789 (info
, input_section
, h
, sym
,
2790 "R_X86_64_IRELATIVE", &outrel
);
2794 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
2795 outrel
.r_addend
= 0;
2798 /* Dynamic relocations are stored in
2799 1. .rela.ifunc section in PIC object.
2800 2. .rela.got section in dynamic executable.
2801 3. .rela.iplt section in static executable. */
2802 if (bfd_link_pic (info
))
2803 sreloc
= htab
->elf
.irelifunc
;
2804 else if (htab
->elf
.splt
!= NULL
)
2805 sreloc
= htab
->elf
.srelgot
;
2807 sreloc
= htab
->elf
.irelplt
;
2808 elf_append_rela (output_bfd
, sreloc
, &outrel
);
2810 /* If this reloc is against an external symbol, we
2811 do not want to fiddle with the addend. Otherwise,
2812 we need to include the symbol value so that it
2813 becomes an addend for the dynamic reloc. For an
2814 internal symbol, we have updated addend. */
2819 case R_X86_64_PC32_BND
:
2821 case R_X86_64_PLT32
:
2822 case R_X86_64_PLT32_BND
:
2828 resolved_to_zero
= (eh
!= NULL
2829 && UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, eh
));
2831 /* When generating a shared object, the relocations handled here are
2832 copied into the output file to be resolved at run time. */
2835 case R_X86_64_GOT32
:
2836 case R_X86_64_GOT64
:
2837 /* Relocation is to the entry for this symbol in the global
2839 case R_X86_64_GOTPCREL
:
2840 case R_X86_64_GOTPCRELX
:
2841 case R_X86_64_REX_GOTPCRELX
:
2842 case R_X86_64_GOTPCREL64
:
2843 /* Use global offset table entry as symbol value. */
2844 case R_X86_64_GOTPLT64
:
2845 /* This is obsolete and treated the same as GOT64. */
2846 base_got
= htab
->elf
.sgot
;
2848 if (htab
->elf
.sgot
== NULL
)
2851 relative_reloc
= false;
2854 off
= h
->got
.offset
;
2856 && h
->plt
.offset
!= (bfd_vma
)-1
2857 && off
== (bfd_vma
)-1)
2859 /* We can't use h->got.offset here to save
2860 state, or even just remember the offset, as
2861 finish_dynamic_symbol would use that as offset into
2863 bfd_vma plt_index
= (h
->plt
.offset
/ plt_entry_size
2864 - htab
->plt
.has_plt0
);
2865 off
= (plt_index
+ 3) * GOT_ENTRY_SIZE
;
2866 base_got
= htab
->elf
.sgotplt
;
2869 if (RESOLVED_LOCALLY_P (info
, h
, htab
))
2871 /* We must initialize this entry in the global offset
2872 table. Since the offset must always be a multiple
2873 of 8, we use the least significant bit to record
2874 whether we have initialized it already.
2876 When doing a dynamic link, we create a .rela.got
2877 relocation entry to initialize the value. This is
2878 done in the finish_dynamic_symbol routine. */
2883 bfd_put_64 (output_bfd
, relocation
,
2884 base_got
->contents
+ off
);
2885 /* Note that this is harmless for the GOTPLT64 case,
2886 as -1 | 1 still is -1. */
2889 /* NB: Don't generate relative relocation here if
2890 it has been generated by DT_RELR. */
2891 if (!info
->enable_dt_relr
2892 && GENERATE_RELATIVE_RELOC_P (info
, h
))
2894 /* If this symbol isn't dynamic in PIC,
2895 generate R_X86_64_RELATIVE here. */
2896 eh
->no_finish_dynamic_symbol
= 1;
2897 relative_reloc
= true;
2902 unresolved_reloc
= false;
2906 if (local_got_offsets
== NULL
)
2909 off
= local_got_offsets
[r_symndx
];
2911 /* The offset must always be a multiple of 8. We use
2912 the least significant bit to record whether we have
2913 already generated the necessary reloc. */
2918 bfd_put_64 (output_bfd
, relocation
,
2919 base_got
->contents
+ off
);
2920 local_got_offsets
[r_symndx
] |= 1;
2922 /* NB: GOTPCREL relocations against local absolute
2923 symbol store relocation value in the GOT slot
2924 without relative relocation. Don't generate
2925 relative relocation here if it has been generated
2927 if (!info
->enable_dt_relr
2928 && bfd_link_pic (info
)
2929 && !(sym
->st_shndx
== SHN_ABS
2930 && (r_type
== R_X86_64_GOTPCREL
2931 || r_type
== R_X86_64_GOTPCRELX
2932 || r_type
== R_X86_64_REX_GOTPCRELX
)))
2933 relative_reloc
= true;
2940 Elf_Internal_Rela outrel
;
2942 /* We need to generate a R_X86_64_RELATIVE reloc
2943 for the dynamic linker. */
2944 s
= htab
->elf
.srelgot
;
2948 outrel
.r_offset
= (base_got
->output_section
->vma
2949 + base_got
->output_offset
2951 outrel
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
2952 outrel
.r_addend
= relocation
;
2954 if (htab
->params
->report_relative_reloc
)
2955 _bfd_x86_elf_link_report_relative_reloc
2956 (info
, input_section
, h
, sym
, "R_X86_64_RELATIVE",
2959 elf_append_rela (output_bfd
, s
, &outrel
);
2962 if (off
>= (bfd_vma
) -2)
2965 relocation
= base_got
->output_section
->vma
2966 + base_got
->output_offset
+ off
;
2967 if (r_type
!= R_X86_64_GOTPCREL
2968 && r_type
!= R_X86_64_GOTPCRELX
2969 && r_type
!= R_X86_64_REX_GOTPCRELX
2970 && r_type
!= R_X86_64_GOTPCREL64
)
2971 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
2972 - htab
->elf
.sgotplt
->output_offset
;
2976 case R_X86_64_GOTOFF64
:
2977 /* Relocation is relative to the start of the global offset
2980 /* Check to make sure it isn't a protected function or data
2981 symbol for shared library since it may not be local when
2982 used as function address or with copy relocation. We also
2983 need to make sure that a symbol is referenced locally. */
2984 if (bfd_link_pic (info
) && h
)
2986 if (!h
->def_regular
)
2990 switch (ELF_ST_VISIBILITY (h
->other
))
2993 v
= _("hidden symbol");
2996 v
= _("internal symbol");
2999 v
= _("protected symbol");
3007 /* xgettext:c-format */
3008 (_("%pB: relocation R_X86_64_GOTOFF64 against undefined %s"
3009 " `%s' can not be used when making a shared object"),
3010 input_bfd
, v
, h
->root
.root
.string
);
3011 bfd_set_error (bfd_error_bad_value
);
3014 else if (!bfd_link_executable (info
)
3015 && !SYMBOL_REFERENCES_LOCAL_P (info
, h
)
3016 && (h
->type
== STT_FUNC
3017 || h
->type
== STT_OBJECT
)
3018 && ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
)
3021 /* xgettext:c-format */
3022 (_("%pB: relocation R_X86_64_GOTOFF64 against protected %s"
3023 " `%s' can not be used when making a shared object"),
3025 h
->type
== STT_FUNC
? "function" : "data",
3026 h
->root
.root
.string
);
3027 bfd_set_error (bfd_error_bad_value
);
3032 /* Note that sgot is not involved in this
3033 calculation. We always want the start of .got.plt. If we
3034 defined _GLOBAL_OFFSET_TABLE_ in a different way, as is
3035 permitted by the ABI, we might have to change this
3037 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3038 + htab
->elf
.sgotplt
->output_offset
;
3041 case R_X86_64_GOTPC32
:
3042 case R_X86_64_GOTPC64
:
3043 /* Use global offset table as symbol value. */
3044 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3045 + htab
->elf
.sgotplt
->output_offset
;
3046 unresolved_reloc
= false;
3049 case R_X86_64_PLTOFF64
:
3050 /* Relocation is PLT entry relative to GOT. For local
3051 symbols it's the symbol itself relative to GOT. */
3053 /* See PLT32 handling. */
3054 && (h
->plt
.offset
!= (bfd_vma
) -1
3055 || eh
->plt_got
.offset
!= (bfd_vma
) -1)
3056 && htab
->elf
.splt
!= NULL
)
3058 if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
3060 /* Use the GOT PLT. */
3061 resolved_plt
= htab
->plt_got
;
3062 plt_offset
= eh
->plt_got
.offset
;
3064 else if (htab
->plt_second
!= NULL
)
3066 resolved_plt
= htab
->plt_second
;
3067 plt_offset
= eh
->plt_second
.offset
;
3071 resolved_plt
= htab
->elf
.splt
;
3072 plt_offset
= h
->plt
.offset
;
3075 relocation
= (resolved_plt
->output_section
->vma
3076 + resolved_plt
->output_offset
3078 unresolved_reloc
= false;
3081 relocation
-= htab
->elf
.sgotplt
->output_section
->vma
3082 + htab
->elf
.sgotplt
->output_offset
;
3085 case R_X86_64_PLT32
:
3086 case R_X86_64_PLT32_BND
:
3087 /* Relocation is to the entry for this symbol in the
3088 procedure linkage table. */
3090 /* Resolve a PLT32 reloc against a local symbol directly,
3091 without using the procedure linkage table. */
3095 if ((h
->plt
.offset
== (bfd_vma
) -1
3096 && eh
->plt_got
.offset
== (bfd_vma
) -1)
3097 || htab
->elf
.splt
== NULL
)
3099 /* We didn't make a PLT entry for this symbol. This
3100 happens when statically linking PIC code, or when
3101 using -Bsymbolic. */
3106 if (h
->plt
.offset
!= (bfd_vma
) -1)
3108 if (htab
->plt_second
!= NULL
)
3110 resolved_plt
= htab
->plt_second
;
3111 plt_offset
= eh
->plt_second
.offset
;
3115 resolved_plt
= htab
->elf
.splt
;
3116 plt_offset
= h
->plt
.offset
;
3121 /* Use the GOT PLT. */
3122 resolved_plt
= htab
->plt_got
;
3123 plt_offset
= eh
->plt_got
.offset
;
3126 relocation
= (resolved_plt
->output_section
->vma
3127 + resolved_plt
->output_offset
3129 unresolved_reloc
= false;
3132 case R_X86_64_SIZE32
:
3133 case R_X86_64_SIZE64
:
3134 /* Set to symbol size. */
3135 relocation
= st_size
;
3141 case R_X86_64_PC32_BND
:
3142 /* Don't complain about -fPIC if the symbol is undefined when
3143 building executable unless it is unresolved weak symbol,
3144 references a dynamic definition in PIE or -z nocopyreloc
3147 = (info
->nocopyreloc
3149 && !h
->root
.linker_def
3150 && !h
->root
.ldscript_def
3151 && eh
->def_protected
3152 && elf_has_no_copy_on_protected (h
->root
.u
.def
.section
->owner
)));
3154 if ((input_section
->flags
& SEC_ALLOC
) != 0
3155 && (input_section
->flags
& SEC_READONLY
) != 0
3157 && ((bfd_link_executable (info
)
3158 && ((h
->root
.type
== bfd_link_hash_undefweak
3160 || !UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
,
3162 || (bfd_link_pie (info
)
3163 && !SYMBOL_DEFINED_NON_SHARED_P (h
)
3167 && !(h
->root
.u
.def
.section
->flags
& SEC_CODE
))))
3168 || (bfd_link_pie (info
)
3169 && h
->root
.type
== bfd_link_hash_undefweak
)
3170 || bfd_link_dll (info
)))
3173 if (SYMBOL_REFERENCES_LOCAL_P (info
, h
))
3175 /* Symbol is referenced locally. Make sure it is
3177 fail
= !SYMBOL_DEFINED_NON_SHARED_P (h
);
3179 else if (bfd_link_pie (info
))
3181 /* We can only use PC-relative relocations in PIE
3182 from non-code sections. */
3183 if (h
->root
.type
== bfd_link_hash_undefweak
3184 || (h
->type
== STT_FUNC
3185 && (sec
->flags
& SEC_CODE
) != 0))
3188 else if (no_copyreloc_p
|| bfd_link_dll (info
))
3190 /* Symbol doesn't need copy reloc and isn't
3191 referenced locally. Don't allow PC-relative
3192 relocations against default and protected
3193 symbols since address of protected function
3194 and location of protected data may not be in
3195 the shared object. */
3196 fail
= (ELF_ST_VISIBILITY (h
->other
) == STV_DEFAULT
3197 || ELF_ST_VISIBILITY (h
->other
) == STV_PROTECTED
);
3201 return elf_x86_64_need_pic (info
, input_bfd
, input_section
,
3202 h
, NULL
, NULL
, howto
);
3204 /* Since x86-64 has PC-relative PLT, we can use PLT in PIE
3205 as function address. */
3207 && (input_section
->flags
& SEC_CODE
) == 0
3208 && bfd_link_pie (info
)
3209 && h
->type
== STT_FUNC
3220 /* FIXME: The ABI says the linker should make sure the value is
3221 the same when it's zeroextended to 64 bit. */
3224 if ((input_section
->flags
& SEC_ALLOC
) == 0)
3227 need_copy_reloc_in_pie
= (bfd_link_pie (info
)
3232 == bfd_link_hash_undefined
))
3233 && (X86_PCREL_TYPE_P (true, r_type
)
3234 || X86_SIZE_TYPE_P (true,
3237 if (GENERATE_DYNAMIC_RELOCATION_P (true, info
, eh
, r_type
, sec
,
3238 need_copy_reloc_in_pie
,
3239 resolved_to_zero
, false))
3241 Elf_Internal_Rela outrel
;
3242 bool skip
, relocate
;
3243 bool generate_dynamic_reloc
= true;
3245 const char *relative_reloc_name
= NULL
;
3247 /* When generating a shared object, these relocations
3248 are copied into the output file to be resolved at run
3254 _bfd_elf_section_offset (output_bfd
, info
, input_section
,
3256 if (outrel
.r_offset
== (bfd_vma
) -1)
3258 else if (outrel
.r_offset
== (bfd_vma
) -2)
3259 skip
= true, relocate
= true;
3261 outrel
.r_offset
+= (input_section
->output_section
->vma
3262 + input_section
->output_offset
);
3265 memset (&outrel
, 0, sizeof outrel
);
3267 else if (COPY_INPUT_RELOC_P (true, info
, h
, r_type
))
3269 outrel
.r_info
= htab
->r_info (h
->dynindx
, r_type
);
3270 outrel
.r_addend
= rel
->r_addend
;
3274 /* This symbol is local, or marked to become local.
3275 When relocation overflow check is disabled, we
3276 convert R_X86_64_32 to dynamic R_X86_64_RELATIVE. */
3277 if (r_type
== htab
->pointer_r_type
3278 || (r_type
== R_X86_64_32
3279 && htab
->params
->no_reloc_overflow_check
))
3282 /* NB: Don't generate relative relocation here if
3283 it has been generated by DT_RELR. */
3284 if (info
->enable_dt_relr
)
3285 generate_dynamic_reloc
= false;
3289 htab
->r_info (0, R_X86_64_RELATIVE
);
3290 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3291 relative_reloc_name
= "R_X86_64_RELATIVE";
3294 else if (r_type
== R_X86_64_64
3295 && !ABI_64_P (output_bfd
))
3298 outrel
.r_info
= htab
->r_info (0,
3299 R_X86_64_RELATIVE64
);
3300 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3301 relative_reloc_name
= "R_X86_64_RELATIVE64";
3302 /* Check addend overflow. */
3303 if ((outrel
.r_addend
& 0x80000000)
3304 != (rel
->r_addend
& 0x80000000))
3307 int addend
= rel
->r_addend
;
3308 if (h
&& h
->root
.root
.string
)
3309 name
= h
->root
.root
.string
;
3311 name
= bfd_elf_sym_name (input_bfd
, symtab_hdr
,
3314 /* xgettext:c-format */
3315 (_("%pB: addend %s%#x in relocation %s against "
3316 "symbol `%s' at %#" PRIx64
3317 " in section `%pA' is out of range"),
3318 input_bfd
, addend
< 0 ? "-" : "", addend
,
3319 howto
->name
, name
, (uint64_t) rel
->r_offset
,
3321 bfd_set_error (bfd_error_bad_value
);
3329 if (bfd_is_abs_section (sec
))
3331 else if (sec
== NULL
|| sec
->owner
== NULL
)
3333 bfd_set_error (bfd_error_bad_value
);
3340 /* We are turning this relocation into one
3341 against a section symbol. It would be
3342 proper to subtract the symbol's value,
3343 osec->vma, from the emitted reloc addend,
3344 but ld.so expects buggy relocs. */
3345 osec
= sec
->output_section
;
3346 sindx
= elf_section_data (osec
)->dynindx
;
3349 asection
*oi
= htab
->elf
.text_index_section
;
3350 sindx
= elf_section_data (oi
)->dynindx
;
3352 BFD_ASSERT (sindx
!= 0);
3355 outrel
.r_info
= htab
->r_info (sindx
, r_type
);
3356 outrel
.r_addend
= relocation
+ rel
->r_addend
;
3360 if (generate_dynamic_reloc
)
3362 sreloc
= elf_section_data (input_section
)->sreloc
;
3364 if (sreloc
== NULL
|| sreloc
->contents
== NULL
)
3366 r
= bfd_reloc_notsupported
;
3367 goto check_relocation_error
;
3370 if (relative_reloc_name
3371 && htab
->params
->report_relative_reloc
)
3372 _bfd_x86_elf_link_report_relative_reloc
3373 (info
, input_section
, h
, sym
,
3374 relative_reloc_name
, &outrel
);
3376 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3379 /* If this reloc is against an external symbol, we do
3380 not want to fiddle with the addend. Otherwise, we
3381 need to include the symbol value so that it becomes
3382 an addend for the dynamic reloc. */
3389 case R_X86_64_TLSGD
:
3390 case R_X86_64_GOTPC32_TLSDESC
:
3391 case R_X86_64_TLSDESC_CALL
:
3392 case R_X86_64_GOTTPOFF
:
3393 tls_type
= GOT_UNKNOWN
;
3394 if (h
== NULL
&& local_got_offsets
)
3395 tls_type
= elf_x86_local_got_tls_type (input_bfd
) [r_symndx
];
3397 tls_type
= elf_x86_hash_entry (h
)->tls_type
;
3399 r_type_tls
= r_type
;
3400 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3401 input_section
, contents
,
3402 symtab_hdr
, sym_hashes
,
3403 &r_type_tls
, tls_type
, rel
,
3404 relend
, h
, r_symndx
, true))
3407 if (r_type_tls
== R_X86_64_TPOFF32
)
3409 bfd_vma roff
= rel
->r_offset
;
3411 BFD_ASSERT (! unresolved_reloc
);
3413 if (r_type
== R_X86_64_TLSGD
)
3415 /* GD->LE transition. For 64bit, change
3416 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3417 .word 0x6666; rex64; call __tls_get_addr@PLT
3419 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3421 call *__tls_get_addr@GOTPCREL(%rip)
3422 which may be converted to
3423 addr32 call __tls_get_addr
3426 leaq foo@tpoff(%rax), %rax
3428 leaq foo@tlsgd(%rip), %rdi
3429 .word 0x6666; rex64; call __tls_get_addr@PLT
3431 leaq foo@tlsgd(%rip), %rdi
3433 call *__tls_get_addr@GOTPCREL(%rip)
3434 which may be converted to
3435 addr32 call __tls_get_addr
3438 leaq foo@tpoff(%rax), %rax
3439 For largepic, change:
3440 leaq foo@tlsgd(%rip), %rdi
3441 movabsq $__tls_get_addr@pltoff, %rax
3446 leaq foo@tpoff(%rax), %rax
3447 nopw 0x0(%rax,%rax,1) */
3449 if (ABI_64_P (output_bfd
))
3451 if (contents
[roff
+ 5] == 0xb8)
3454 || (roff
- 3 + 22) > input_section
->size
)
3457 info
->callbacks
->einfo
3458 (_("%F%P: corrupt input: %pB\n"),
3462 memcpy (contents
+ roff
- 3,
3463 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80"
3464 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3470 || (roff
- 4 + 16) > input_section
->size
)
3472 memcpy (contents
+ roff
- 4,
3473 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3480 || (roff
- 3 + 15) > input_section
->size
)
3482 memcpy (contents
+ roff
- 3,
3483 "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0",
3486 bfd_put_32 (output_bfd
,
3487 elf_x86_64_tpoff (info
, relocation
),
3488 contents
+ roff
+ 8 + largepic
);
3489 /* Skip R_X86_64_PC32, R_X86_64_PLT32,
3490 R_X86_64_GOTPCRELX and R_X86_64_PLTOFF64. */
3495 else if (r_type
== R_X86_64_GOTPC32_TLSDESC
)
3497 /* GDesc -> LE transition.
3498 It's originally something like:
3499 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
3500 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
3503 movq $x@tpoff, %rax <--- LP64 mode.
3504 rex movl $x@tpoff, %eax <--- X32 mode.
3507 unsigned int val
, type
;
3511 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3512 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3513 bfd_put_8 (output_bfd
,
3514 (type
& 0x48) | ((type
>> 2) & 1),
3515 contents
+ roff
- 3);
3516 bfd_put_8 (output_bfd
, 0xc7, contents
+ roff
- 2);
3517 bfd_put_8 (output_bfd
, 0xc0 | ((val
>> 3) & 7),
3518 contents
+ roff
- 1);
3519 bfd_put_32 (output_bfd
,
3520 elf_x86_64_tpoff (info
, relocation
),
3524 else if (r_type
== R_X86_64_TLSDESC_CALL
)
3526 /* GDesc -> LE transition.
3528 call *(%rax) <--- LP64 mode.
3529 call *(%eax) <--- X32 mode.
3531 xchg %ax,%ax <-- LP64 mode.
3532 nopl (%rax) <-- X32 mode.
3534 unsigned int prefix
= 0;
3535 if (!ABI_64_P (input_bfd
))
3537 /* Check for call *x@tlsdesc(%eax). */
3538 if (contents
[roff
] == 0x67)
3543 bfd_put_8 (output_bfd
, 0x0f, contents
+ roff
);
3544 bfd_put_8 (output_bfd
, 0x1f, contents
+ roff
+ 1);
3545 bfd_put_8 (output_bfd
, 0x00, contents
+ roff
+ 2);
3549 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3550 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3554 else if (r_type
== R_X86_64_GOTTPOFF
)
3556 /* IE->LE transition:
3557 For 64bit, originally it can be one of:
3558 movq foo@gottpoff(%rip), %reg
3559 addq foo@gottpoff(%rip), %reg
3562 leaq foo(%reg), %reg
3564 For 32bit, originally it can be one of:
3565 movq foo@gottpoff(%rip), %reg
3566 addl foo@gottpoff(%rip), %reg
3569 leal foo(%reg), %reg
3572 unsigned int val
, type
, reg
;
3575 val
= bfd_get_8 (input_bfd
, contents
+ roff
- 3);
3582 type
= bfd_get_8 (input_bfd
, contents
+ roff
- 2);
3583 reg
= bfd_get_8 (input_bfd
, contents
+ roff
- 1);
3592 bfd_put_8 (output_bfd
, 0x49,
3593 contents
+ roff
- 3);
3595 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3599 bfd_put_8 (output_bfd
, 0x41,
3600 contents
+ roff
- 3);
3602 bfd_put_8 (output_bfd
, 0xc7,
3603 contents
+ roff
- 2);
3604 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3605 contents
+ roff
- 1);
3609 /* addq/addl -> addq/addl - addressing with %rsp/%r12
3615 bfd_put_8 (output_bfd
, 0x49,
3616 contents
+ roff
- 3);
3618 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3622 bfd_put_8 (output_bfd
, 0x41,
3623 contents
+ roff
- 3);
3625 bfd_put_8 (output_bfd
, 0x81,
3626 contents
+ roff
- 2);
3627 bfd_put_8 (output_bfd
, 0xc0 | reg
,
3628 contents
+ roff
- 1);
3632 /* addq/addl -> leaq/leal */
3637 bfd_put_8 (output_bfd
, 0x4d,
3638 contents
+ roff
- 3);
3640 else if (!ABI_64_P (output_bfd
) && val
== 0x44)
3644 bfd_put_8 (output_bfd
, 0x45,
3645 contents
+ roff
- 3);
3647 bfd_put_8 (output_bfd
, 0x8d,
3648 contents
+ roff
- 2);
3649 bfd_put_8 (output_bfd
, 0x80 | reg
| (reg
<< 3),
3650 contents
+ roff
- 1);
3652 bfd_put_32 (output_bfd
,
3653 elf_x86_64_tpoff (info
, relocation
),
3661 if (htab
->elf
.sgot
== NULL
)
3666 off
= h
->got
.offset
;
3667 offplt
= elf_x86_hash_entry (h
)->tlsdesc_got
;
3671 if (local_got_offsets
== NULL
)
3674 off
= local_got_offsets
[r_symndx
];
3675 offplt
= local_tlsdesc_gotents
[r_symndx
];
3682 Elf_Internal_Rela outrel
;
3686 if (htab
->elf
.srelgot
== NULL
)
3689 indx
= h
&& h
->dynindx
!= -1 ? h
->dynindx
: 0;
3691 if (GOT_TLS_GDESC_P (tls_type
))
3693 outrel
.r_info
= htab
->r_info (indx
, R_X86_64_TLSDESC
);
3694 BFD_ASSERT (htab
->sgotplt_jump_table_size
+ offplt
3695 + 2 * GOT_ENTRY_SIZE
<= htab
->elf
.sgotplt
->size
);
3696 outrel
.r_offset
= (htab
->elf
.sgotplt
->output_section
->vma
3697 + htab
->elf
.sgotplt
->output_offset
3699 + htab
->sgotplt_jump_table_size
);
3700 sreloc
= htab
->elf
.srelplt
;
3702 outrel
.r_addend
= relocation
- _bfd_x86_elf_dtpoff_base (info
);
3704 outrel
.r_addend
= 0;
3705 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3708 sreloc
= htab
->elf
.srelgot
;
3710 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
3711 + htab
->elf
.sgot
->output_offset
+ off
);
3713 if (GOT_TLS_GD_P (tls_type
))
3714 dr_type
= R_X86_64_DTPMOD64
;
3715 else if (GOT_TLS_GDESC_P (tls_type
))
3718 dr_type
= R_X86_64_TPOFF64
;
3720 bfd_put_64 (output_bfd
, 0, htab
->elf
.sgot
->contents
+ off
);
3721 outrel
.r_addend
= 0;
3722 if ((dr_type
== R_X86_64_TPOFF64
3723 || dr_type
== R_X86_64_TLSDESC
) && indx
== 0)
3724 outrel
.r_addend
= relocation
- _bfd_x86_elf_dtpoff_base (info
);
3725 outrel
.r_info
= htab
->r_info (indx
, dr_type
);
3727 elf_append_rela (output_bfd
, sreloc
, &outrel
);
3729 if (GOT_TLS_GD_P (tls_type
))
3733 BFD_ASSERT (! unresolved_reloc
);
3734 bfd_put_64 (output_bfd
,
3735 relocation
- _bfd_x86_elf_dtpoff_base (info
),
3736 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3740 bfd_put_64 (output_bfd
, 0,
3741 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
3742 outrel
.r_info
= htab
->r_info (indx
,
3744 outrel
.r_offset
+= GOT_ENTRY_SIZE
;
3745 elf_append_rela (output_bfd
, sreloc
,
3754 local_got_offsets
[r_symndx
] |= 1;
3757 if (off
>= (bfd_vma
) -2
3758 && ! GOT_TLS_GDESC_P (tls_type
))
3760 if (r_type_tls
== r_type
)
3762 if (r_type
== R_X86_64_GOTPC32_TLSDESC
3763 || r_type
== R_X86_64_TLSDESC_CALL
)
3764 relocation
= htab
->elf
.sgotplt
->output_section
->vma
3765 + htab
->elf
.sgotplt
->output_offset
3766 + offplt
+ htab
->sgotplt_jump_table_size
;
3768 relocation
= htab
->elf
.sgot
->output_section
->vma
3769 + htab
->elf
.sgot
->output_offset
+ off
;
3770 unresolved_reloc
= false;
3774 bfd_vma roff
= rel
->r_offset
;
3776 if (r_type
== R_X86_64_TLSGD
)
3778 /* GD->IE transition. For 64bit, change
3779 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3780 .word 0x6666; rex64; call __tls_get_addr@PLT
3782 .byte 0x66; leaq foo@tlsgd(%rip), %rdi
3784 call *__tls_get_addr@GOTPCREL(%rip
3785 which may be converted to
3786 addr32 call __tls_get_addr
3789 addq foo@gottpoff(%rip), %rax
3791 leaq foo@tlsgd(%rip), %rdi
3792 .word 0x6666; rex64; call __tls_get_addr@PLT
3794 leaq foo@tlsgd(%rip), %rdi
3796 call *__tls_get_addr@GOTPCREL(%rip)
3797 which may be converted to
3798 addr32 call __tls_get_addr
3801 addq foo@gottpoff(%rip), %rax
3802 For largepic, change:
3803 leaq foo@tlsgd(%rip), %rdi
3804 movabsq $__tls_get_addr@pltoff, %rax
3809 addq foo@gottpoff(%rax), %rax
3810 nopw 0x0(%rax,%rax,1) */
3812 if (ABI_64_P (output_bfd
))
3814 if (contents
[roff
+ 5] == 0xb8)
3817 || (roff
- 3 + 22) > input_section
->size
)
3819 memcpy (contents
+ roff
- 3,
3820 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05"
3821 "\0\0\0\0\x66\x0f\x1f\x44\0", 22);
3827 || (roff
- 4 + 16) > input_section
->size
)
3829 memcpy (contents
+ roff
- 4,
3830 "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3837 || (roff
- 3 + 15) > input_section
->size
)
3839 memcpy (contents
+ roff
- 3,
3840 "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0",
3844 relocation
= (htab
->elf
.sgot
->output_section
->vma
3845 + htab
->elf
.sgot
->output_offset
+ off
3848 - input_section
->output_section
->vma
3849 - input_section
->output_offset
3851 bfd_put_32 (output_bfd
, relocation
,
3852 contents
+ roff
+ 8 + largepic
);
3853 /* Skip R_X86_64_PLT32/R_X86_64_PLTOFF64. */
3858 else if (r_type
== R_X86_64_GOTPC32_TLSDESC
)
3860 /* GDesc -> IE transition.
3861 It's originally something like:
3862 leaq x@tlsdesc(%rip), %rax <--- LP64 mode.
3863 rex leal x@tlsdesc(%rip), %eax <--- X32 mode.
3866 # before xchg %ax,%ax in LP64 mode.
3867 movq x@gottpoff(%rip), %rax
3868 # before nopl (%rax) in X32 mode.
3869 rex movl x@gottpoff(%rip), %eax
3872 /* Now modify the instruction as appropriate. To
3873 turn a lea into a mov in the form we use it, it
3874 suffices to change the second byte from 0x8d to
3878 bfd_put_8 (output_bfd
, 0x8b, contents
+ roff
- 2);
3880 bfd_put_32 (output_bfd
,
3881 htab
->elf
.sgot
->output_section
->vma
3882 + htab
->elf
.sgot
->output_offset
+ off
3884 - input_section
->output_section
->vma
3885 - input_section
->output_offset
3890 else if (r_type
== R_X86_64_TLSDESC_CALL
)
3892 /* GDesc -> IE transition.
3894 call *(%rax) <--- LP64 mode.
3895 call *(%eax) <--- X32 mode.
3898 xchg %ax, %ax <-- LP64 mode.
3899 nopl (%rax) <-- X32 mode.
3902 unsigned int prefix
= 0;
3903 if (!ABI_64_P (input_bfd
))
3905 /* Check for call *x@tlsdesc(%eax). */
3906 if (contents
[roff
] == 0x67)
3911 bfd_put_8 (output_bfd
, 0x0f, contents
+ roff
);
3912 bfd_put_8 (output_bfd
, 0x1f, contents
+ roff
+ 1);
3913 bfd_put_8 (output_bfd
, 0x00, contents
+ roff
+ 2);
3917 bfd_put_8 (output_bfd
, 0x66, contents
+ roff
);
3918 bfd_put_8 (output_bfd
, 0x90, contents
+ roff
+ 1);
3927 case R_X86_64_TLSLD
:
3928 if (! elf_x86_64_tls_transition (info
, input_bfd
,
3929 input_section
, contents
,
3930 symtab_hdr
, sym_hashes
,
3931 &r_type
, GOT_UNKNOWN
, rel
,
3932 relend
, h
, r_symndx
, true))
3935 if (r_type
!= R_X86_64_TLSLD
)
3937 /* LD->LE transition:
3938 leaq foo@tlsld(%rip), %rdi
3939 call __tls_get_addr@PLT
3940 For 64bit, we change it into:
3941 .word 0x6666; .byte 0x66; movq %fs:0, %rax
3942 For 32bit, we change it into:
3943 nopl 0x0(%rax); movl %fs:0, %eax
3945 leaq foo@tlsld(%rip), %rdi;
3946 call *__tls_get_addr@GOTPCREL(%rip)
3947 which may be converted to
3948 addr32 call __tls_get_addr
3949 For 64bit, we change it into:
3950 .word 0x6666; .word 0x6666; movq %fs:0, %rax
3951 For 32bit, we change it into:
3952 nopw 0x0(%rax); movl %fs:0, %eax
3953 For largepic, change:
3954 leaq foo@tlsgd(%rip), %rdi
3955 movabsq $__tls_get_addr@pltoff, %rax
3959 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
3962 BFD_ASSERT (r_type
== R_X86_64_TPOFF32
);
3963 if (ABI_64_P (output_bfd
))
3965 if ((rel
->r_offset
+ 5) >= input_section
->size
)
3967 if (contents
[rel
->r_offset
+ 5] == 0xb8)
3969 if (rel
->r_offset
< 3
3970 || (rel
->r_offset
- 3 + 22) > input_section
->size
)
3972 memcpy (contents
+ rel
->r_offset
- 3,
3973 "\x66\x66\x66\x66\x2e\x0f\x1f\x84\0\0\0\0\0"
3974 "\x64\x48\x8b\x04\x25\0\0\0", 22);
3976 else if (contents
[rel
->r_offset
+ 4] == 0xff
3977 || contents
[rel
->r_offset
+ 4] == 0x67)
3979 if (rel
->r_offset
< 3
3980 || (rel
->r_offset
- 3 + 13) > input_section
->size
)
3982 memcpy (contents
+ rel
->r_offset
- 3,
3983 "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0",
3989 if (rel
->r_offset
< 3
3990 || (rel
->r_offset
- 3 + 12) > input_section
->size
)
3992 memcpy (contents
+ rel
->r_offset
- 3,
3993 "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0", 12);
3998 if ((rel
->r_offset
+ 4) >= input_section
->size
)
4000 if (contents
[rel
->r_offset
+ 4] == 0xff)
4002 if (rel
->r_offset
< 3
4003 || (rel
->r_offset
- 3 + 13) > input_section
->size
)
4005 memcpy (contents
+ rel
->r_offset
- 3,
4006 "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0",
4011 if (rel
->r_offset
< 3
4012 || (rel
->r_offset
- 3 + 12) > input_section
->size
)
4014 memcpy (contents
+ rel
->r_offset
- 3,
4015 "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0", 12);
4018 /* Skip R_X86_64_PC32, R_X86_64_PLT32, R_X86_64_GOTPCRELX
4019 and R_X86_64_PLTOFF64. */
4025 if (htab
->elf
.sgot
== NULL
)
4028 off
= htab
->tls_ld_or_ldm_got
.offset
;
4033 Elf_Internal_Rela outrel
;
4035 if (htab
->elf
.srelgot
== NULL
)
4038 outrel
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4039 + htab
->elf
.sgot
->output_offset
+ off
);
4041 bfd_put_64 (output_bfd
, 0,
4042 htab
->elf
.sgot
->contents
+ off
);
4043 bfd_put_64 (output_bfd
, 0,
4044 htab
->elf
.sgot
->contents
+ off
+ GOT_ENTRY_SIZE
);
4045 outrel
.r_info
= htab
->r_info (0, R_X86_64_DTPMOD64
);
4046 outrel
.r_addend
= 0;
4047 elf_append_rela (output_bfd
, htab
->elf
.srelgot
,
4049 htab
->tls_ld_or_ldm_got
.offset
|= 1;
4051 relocation
= htab
->elf
.sgot
->output_section
->vma
4052 + htab
->elf
.sgot
->output_offset
+ off
;
4053 unresolved_reloc
= false;
4056 case R_X86_64_DTPOFF32
:
4057 if (!bfd_link_executable (info
)
4058 || (input_section
->flags
& SEC_CODE
) == 0)
4059 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
4061 relocation
= elf_x86_64_tpoff (info
, relocation
);
4064 case R_X86_64_TPOFF32
:
4065 case R_X86_64_TPOFF64
:
4066 BFD_ASSERT (bfd_link_executable (info
));
4067 relocation
= elf_x86_64_tpoff (info
, relocation
);
4070 case R_X86_64_DTPOFF64
:
4071 BFD_ASSERT ((input_section
->flags
& SEC_CODE
) == 0);
4072 relocation
-= _bfd_x86_elf_dtpoff_base (info
);
4079 /* Dynamic relocs are not propagated for SEC_DEBUGGING sections
4080 because such sections are not SEC_ALLOC and thus ld.so will
4081 not process them. */
4082 if (unresolved_reloc
4083 && !((input_section
->flags
& SEC_DEBUGGING
) != 0
4085 && _bfd_elf_section_offset (output_bfd
, info
, input_section
,
4086 rel
->r_offset
) != (bfd_vma
) -1)
4091 sec
= h
->root
.u
.def
.section
;
4092 if ((info
->nocopyreloc
4093 || (eh
->def_protected
4094 && elf_has_no_copy_on_protected (h
->root
.u
.def
.section
->owner
)))
4095 && !(h
->root
.u
.def
.section
->flags
& SEC_CODE
))
4096 return elf_x86_64_need_pic (info
, input_bfd
, input_section
,
4097 h
, NULL
, NULL
, howto
);
4102 /* xgettext:c-format */
4103 (_("%pB(%pA+%#" PRIx64
"): "
4104 "unresolvable %s relocation against symbol `%s'"),
4107 (uint64_t) rel
->r_offset
,
4109 h
->root
.root
.string
);
4115 r
= _bfd_final_link_relocate (howto
, input_bfd
, input_section
,
4116 contents
, rel
->r_offset
,
4117 relocation
, rel
->r_addend
);
4119 check_relocation_error
:
4120 if (r
!= bfd_reloc_ok
)
4125 name
= h
->root
.root
.string
;
4128 name
= bfd_elf_string_from_elf_section (input_bfd
,
4129 symtab_hdr
->sh_link
,
4134 name
= bfd_section_name (sec
);
4137 if (r
== bfd_reloc_overflow
)
4139 if (converted_reloc
)
4141 info
->callbacks
->einfo
4142 ("%X%H:", input_bfd
, input_section
, rel
->r_offset
);
4143 info
->callbacks
->einfo
4144 (_(" failed to convert GOTPCREL relocation against "
4145 "'%s'; relink with --no-relax\n"),
4150 (*info
->callbacks
->reloc_overflow
)
4151 (info
, (h
? &h
->root
: NULL
), name
, howto
->name
,
4152 (bfd_vma
) 0, input_bfd
, input_section
, rel
->r_offset
);
4157 /* xgettext:c-format */
4158 (_("%pB(%pA+%#" PRIx64
"): reloc against `%s': error %d"),
4159 input_bfd
, input_section
,
4160 (uint64_t) rel
->r_offset
, name
, (int) r
);
4171 Elf_Internal_Shdr
*rel_hdr
;
4172 size_t deleted
= rel
- wrel
;
4174 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
->output_section
);
4175 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
4176 if (rel_hdr
->sh_size
== 0)
4178 /* It is too late to remove an empty reloc section. Leave
4180 ??? What is wrong with an empty section??? */
4181 rel_hdr
->sh_size
= rel_hdr
->sh_entsize
;
4184 rel_hdr
= _bfd_elf_single_rel_hdr (input_section
);
4185 rel_hdr
->sh_size
-= rel_hdr
->sh_entsize
* deleted
;
4186 input_section
->reloc_count
-= deleted
;
4192 /* Finish up dynamic symbol handling. We set the contents of various
4193 dynamic sections here. */
4196 elf_x86_64_finish_dynamic_symbol (bfd
*output_bfd
,
4197 struct bfd_link_info
*info
,
4198 struct elf_link_hash_entry
*h
,
4199 Elf_Internal_Sym
*sym
)
4201 struct elf_x86_link_hash_table
*htab
;
4202 bool use_plt_second
;
4203 struct elf_x86_link_hash_entry
*eh
;
4204 bool local_undefweak
;
4206 htab
= elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4210 /* Use the second PLT section only if there is .plt section. */
4211 use_plt_second
= htab
->elf
.splt
!= NULL
&& htab
->plt_second
!= NULL
;
4213 eh
= (struct elf_x86_link_hash_entry
*) h
;
4214 if (eh
->no_finish_dynamic_symbol
)
4217 /* We keep PLT/GOT entries without dynamic PLT/GOT relocations for
4218 resolved undefined weak symbols in executable so that their
4219 references have value 0 at run-time. */
4220 local_undefweak
= UNDEFINED_WEAK_RESOLVED_TO_ZERO (info
, eh
);
4222 if (h
->plt
.offset
!= (bfd_vma
) -1)
4225 bfd_vma got_offset
, plt_offset
;
4226 Elf_Internal_Rela rela
;
4228 asection
*plt
, *gotplt
, *relplt
, *resolved_plt
;
4229 const struct elf_backend_data
*bed
;
4230 bfd_vma plt_got_pcrel_offset
;
4232 /* When building a static executable, use .iplt, .igot.plt and
4233 .rela.iplt sections for STT_GNU_IFUNC symbols. */
4234 if (htab
->elf
.splt
!= NULL
)
4236 plt
= htab
->elf
.splt
;
4237 gotplt
= htab
->elf
.sgotplt
;
4238 relplt
= htab
->elf
.srelplt
;
4242 plt
= htab
->elf
.iplt
;
4243 gotplt
= htab
->elf
.igotplt
;
4244 relplt
= htab
->elf
.irelplt
;
4247 VERIFY_PLT_ENTRY (info
, h
, plt
, gotplt
, relplt
, local_undefweak
)
4249 /* Get the index in the procedure linkage table which
4250 corresponds to this symbol. This is the index of this symbol
4251 in all the symbols for which we are making plt entries. The
4252 first entry in the procedure linkage table is reserved.
4254 Get the offset into the .got table of the entry that
4255 corresponds to this function. Each .got entry is GOT_ENTRY_SIZE
4256 bytes. The first three are reserved for the dynamic linker.
4258 For static executables, we don't reserve anything. */
4260 if (plt
== htab
->elf
.splt
)
4262 got_offset
= (h
->plt
.offset
/ htab
->plt
.plt_entry_size
4263 - htab
->plt
.has_plt0
);
4264 got_offset
= (got_offset
+ 3) * GOT_ENTRY_SIZE
;
4268 got_offset
= h
->plt
.offset
/ htab
->plt
.plt_entry_size
;
4269 got_offset
= got_offset
* GOT_ENTRY_SIZE
;
4272 /* Fill in the entry in the procedure linkage table. */
4273 memcpy (plt
->contents
+ h
->plt
.offset
, htab
->plt
.plt_entry
,
4274 htab
->plt
.plt_entry_size
);
4277 memcpy (htab
->plt_second
->contents
+ eh
->plt_second
.offset
,
4278 htab
->non_lazy_plt
->plt_entry
,
4279 htab
->non_lazy_plt
->plt_entry_size
);
4281 resolved_plt
= htab
->plt_second
;
4282 plt_offset
= eh
->plt_second
.offset
;
4287 plt_offset
= h
->plt
.offset
;
4290 /* Insert the relocation positions of the plt section. */
4292 /* Put offset the PC-relative instruction referring to the GOT entry,
4293 subtracting the size of that instruction. */
4294 plt_got_pcrel_offset
= (gotplt
->output_section
->vma
4295 + gotplt
->output_offset
4297 - resolved_plt
->output_section
->vma
4298 - resolved_plt
->output_offset
4300 - htab
->plt
.plt_got_insn_size
);
4302 /* Check PC-relative offset overflow in PLT entry. */
4303 if ((plt_got_pcrel_offset
+ 0x80000000) > 0xffffffff)
4304 /* xgettext:c-format */
4305 info
->callbacks
->einfo (_("%F%pB: PC-relative offset overflow in PLT entry for `%s'\n"),
4306 output_bfd
, h
->root
.root
.string
);
4308 bfd_put_32 (output_bfd
, plt_got_pcrel_offset
,
4309 (resolved_plt
->contents
+ plt_offset
4310 + htab
->plt
.plt_got_offset
));
4312 /* Fill in the entry in the global offset table, initially this
4313 points to the second part of the PLT entry. Leave the entry
4314 as zero for undefined weak symbol in PIE. No PLT relocation
4315 against undefined weak symbol in PIE. */
4316 if (!local_undefweak
)
4318 if (htab
->plt
.has_plt0
)
4319 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4320 + plt
->output_offset
4322 + htab
->lazy_plt
->plt_lazy_offset
),
4323 gotplt
->contents
+ got_offset
);
4325 /* Fill in the entry in the .rela.plt section. */
4326 rela
.r_offset
= (gotplt
->output_section
->vma
4327 + gotplt
->output_offset
4329 if (PLT_LOCAL_IFUNC_P (info
, h
))
4331 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
4332 h
->root
.root
.string
,
4333 h
->root
.u
.def
.section
->owner
);
4335 /* If an STT_GNU_IFUNC symbol is locally defined, generate
4336 R_X86_64_IRELATIVE instead of R_X86_64_JUMP_SLOT. */
4337 rela
.r_info
= htab
->r_info (0, R_X86_64_IRELATIVE
);
4338 rela
.r_addend
= (h
->root
.u
.def
.value
4339 + h
->root
.u
.def
.section
->output_section
->vma
4340 + h
->root
.u
.def
.section
->output_offset
);
4342 if (htab
->params
->report_relative_reloc
)
4343 _bfd_x86_elf_link_report_relative_reloc
4344 (info
, relplt
, h
, sym
, "R_X86_64_IRELATIVE", &rela
);
4346 /* R_X86_64_IRELATIVE comes last. */
4347 plt_index
= htab
->next_irelative_index
--;
4351 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_JUMP_SLOT
);
4353 plt_index
= htab
->next_jump_slot_index
++;
4356 /* Don't fill the second and third slots in PLT entry for
4357 static executables nor without PLT0. */
4358 if (plt
== htab
->elf
.splt
&& htab
->plt
.has_plt0
)
4361 = h
->plt
.offset
+ htab
->lazy_plt
->plt_plt_insn_end
;
4363 /* Put relocation index. */
4364 bfd_put_32 (output_bfd
, plt_index
,
4365 (plt
->contents
+ h
->plt
.offset
4366 + htab
->lazy_plt
->plt_reloc_offset
));
4368 /* Put offset for jmp .PLT0 and check for overflow. We don't
4369 check relocation index for overflow since branch displacement
4370 will overflow first. */
4371 if (plt0_offset
> 0x80000000)
4372 /* xgettext:c-format */
4373 info
->callbacks
->einfo (_("%F%pB: branch displacement overflow in PLT entry for `%s'\n"),
4374 output_bfd
, h
->root
.root
.string
);
4375 bfd_put_32 (output_bfd
, - plt0_offset
,
4376 (plt
->contents
+ h
->plt
.offset
4377 + htab
->lazy_plt
->plt_plt_offset
));
4380 bed
= get_elf_backend_data (output_bfd
);
4381 loc
= relplt
->contents
+ plt_index
* bed
->s
->sizeof_rela
;
4382 bed
->s
->swap_reloca_out (output_bfd
, &rela
, loc
);
4385 else if (eh
->plt_got
.offset
!= (bfd_vma
) -1)
4387 bfd_vma got_offset
, plt_offset
;
4388 asection
*plt
, *got
;
4390 int32_t got_pcrel_offset
;
4392 /* Set the entry in the GOT procedure linkage table. */
4393 plt
= htab
->plt_got
;
4394 got
= htab
->elf
.sgot
;
4395 got_offset
= h
->got
.offset
;
4397 if (got_offset
== (bfd_vma
) -1
4398 || (h
->type
== STT_GNU_IFUNC
&& h
->def_regular
)
4403 /* Use the non-lazy PLT entry template for the GOT PLT since they
4404 are the identical. */
4405 /* Fill in the entry in the GOT procedure linkage table. */
4406 plt_offset
= eh
->plt_got
.offset
;
4407 memcpy (plt
->contents
+ plt_offset
,
4408 htab
->non_lazy_plt
->plt_entry
,
4409 htab
->non_lazy_plt
->plt_entry_size
);
4411 /* Put offset the PC-relative instruction referring to the GOT
4412 entry, subtracting the size of that instruction. */
4413 got_pcrel_offset
= (got
->output_section
->vma
4414 + got
->output_offset
4416 - plt
->output_section
->vma
4417 - plt
->output_offset
4419 - htab
->non_lazy_plt
->plt_got_insn_size
);
4421 /* Check PC-relative offset overflow in GOT PLT entry. */
4422 got_after_plt
= got
->output_section
->vma
> plt
->output_section
->vma
;
4423 if ((got_after_plt
&& got_pcrel_offset
< 0)
4424 || (!got_after_plt
&& got_pcrel_offset
> 0))
4425 /* xgettext:c-format */
4426 info
->callbacks
->einfo (_("%F%pB: PC-relative offset overflow in GOT PLT entry for `%s'\n"),
4427 output_bfd
, h
->root
.root
.string
);
4429 bfd_put_32 (output_bfd
, got_pcrel_offset
,
4430 (plt
->contents
+ plt_offset
4431 + htab
->non_lazy_plt
->plt_got_offset
));
4434 if (!local_undefweak
4436 && (h
->plt
.offset
!= (bfd_vma
) -1
4437 || eh
->plt_got
.offset
!= (bfd_vma
) -1))
4439 /* Mark the symbol as undefined, rather than as defined in
4440 the .plt section. Leave the value if there were any
4441 relocations where pointer equality matters (this is a clue
4442 for the dynamic linker, to make function pointer
4443 comparisons work between an application and shared
4444 library), otherwise set it to zero. If a function is only
4445 called from a binary, there is no need to slow down
4446 shared libraries because of that. */
4447 sym
->st_shndx
= SHN_UNDEF
;
4448 if (!h
->pointer_equality_needed
)
4452 _bfd_x86_elf_link_fixup_ifunc_symbol (info
, htab
, h
, sym
);
4454 /* Don't generate dynamic GOT relocation against undefined weak
4455 symbol in executable. */
4456 if (h
->got
.offset
!= (bfd_vma
) -1
4457 && ! GOT_TLS_GD_ANY_P (elf_x86_hash_entry (h
)->tls_type
)
4458 && elf_x86_hash_entry (h
)->tls_type
!= GOT_TLS_IE
4459 && !local_undefweak
)
4461 Elf_Internal_Rela rela
;
4462 asection
*relgot
= htab
->elf
.srelgot
;
4463 const char *relative_reloc_name
= NULL
;
4464 bool generate_dynamic_reloc
= true;
4466 /* This symbol has an entry in the global offset table. Set it
4468 if (htab
->elf
.sgot
== NULL
|| htab
->elf
.srelgot
== NULL
)
4471 rela
.r_offset
= (htab
->elf
.sgot
->output_section
->vma
4472 + htab
->elf
.sgot
->output_offset
4473 + (h
->got
.offset
&~ (bfd_vma
) 1));
4475 /* If this is a static link, or it is a -Bsymbolic link and the
4476 symbol is defined locally or was forced to be local because
4477 of a version file, we just want to emit a RELATIVE reloc.
4478 The entry in the global offset table will already have been
4479 initialized in the relocate_section function. */
4481 && h
->type
== STT_GNU_IFUNC
)
4483 if (h
->plt
.offset
== (bfd_vma
) -1)
4485 /* STT_GNU_IFUNC is referenced without PLT. */
4486 if (htab
->elf
.splt
== NULL
)
4488 /* use .rel[a].iplt section to store .got relocations
4489 in static executable. */
4490 relgot
= htab
->elf
.irelplt
;
4492 if (SYMBOL_REFERENCES_LOCAL_P (info
, h
))
4494 info
->callbacks
->minfo (_("Local IFUNC function `%s' in %pB\n"),
4495 h
->root
.root
.string
,
4496 h
->root
.u
.def
.section
->owner
);
4498 rela
.r_info
= htab
->r_info (0,
4499 R_X86_64_IRELATIVE
);
4500 rela
.r_addend
= (h
->root
.u
.def
.value
4501 + h
->root
.u
.def
.section
->output_section
->vma
4502 + h
->root
.u
.def
.section
->output_offset
);
4503 relative_reloc_name
= "R_X86_64_IRELATIVE";
4508 else if (bfd_link_pic (info
))
4510 /* Generate R_X86_64_GLOB_DAT. */
4518 if (!h
->pointer_equality_needed
)
4521 /* For non-shared object, we can't use .got.plt, which
4522 contains the real function addres if we need pointer
4523 equality. We load the GOT entry with the PLT entry. */
4524 if (htab
->plt_second
!= NULL
)
4526 plt
= htab
->plt_second
;
4527 plt_offset
= eh
->plt_second
.offset
;
4531 plt
= htab
->elf
.splt
? htab
->elf
.splt
: htab
->elf
.iplt
;
4532 plt_offset
= h
->plt
.offset
;
4534 bfd_put_64 (output_bfd
, (plt
->output_section
->vma
4535 + plt
->output_offset
4537 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4541 else if (bfd_link_pic (info
)
4542 && SYMBOL_REFERENCES_LOCAL_P (info
, h
))
4544 if (!SYMBOL_DEFINED_NON_SHARED_P (h
))
4546 BFD_ASSERT((h
->got
.offset
& 1) != 0);
4547 if (info
->enable_dt_relr
)
4548 generate_dynamic_reloc
= false;
4551 rela
.r_info
= htab
->r_info (0, R_X86_64_RELATIVE
);
4552 rela
.r_addend
= (h
->root
.u
.def
.value
4553 + h
->root
.u
.def
.section
->output_section
->vma
4554 + h
->root
.u
.def
.section
->output_offset
);
4555 relative_reloc_name
= "R_X86_64_RELATIVE";
4560 BFD_ASSERT((h
->got
.offset
& 1) == 0);
4562 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4563 htab
->elf
.sgot
->contents
+ h
->got
.offset
);
4564 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_GLOB_DAT
);
4568 if (generate_dynamic_reloc
)
4570 if (relative_reloc_name
!= NULL
4571 && htab
->params
->report_relative_reloc
)
4572 _bfd_x86_elf_link_report_relative_reloc
4573 (info
, relgot
, h
, sym
, relative_reloc_name
, &rela
);
4575 elf_append_rela (output_bfd
, relgot
, &rela
);
4581 Elf_Internal_Rela rela
;
4584 /* This symbol needs a copy reloc. Set it up. */
4585 VERIFY_COPY_RELOC (h
, htab
)
4587 rela
.r_offset
= (h
->root
.u
.def
.value
4588 + h
->root
.u
.def
.section
->output_section
->vma
4589 + h
->root
.u
.def
.section
->output_offset
);
4590 rela
.r_info
= htab
->r_info (h
->dynindx
, R_X86_64_COPY
);
4592 if (h
->root
.u
.def
.section
== htab
->elf
.sdynrelro
)
4593 s
= htab
->elf
.sreldynrelro
;
4595 s
= htab
->elf
.srelbss
;
4596 elf_append_rela (output_bfd
, s
, &rela
);
4602 /* Finish up local dynamic symbol handling. We set the contents of
4603 various dynamic sections here. */
4606 elf_x86_64_finish_local_dynamic_symbol (void **slot
, void *inf
)
4608 struct elf_link_hash_entry
*h
4609 = (struct elf_link_hash_entry
*) *slot
;
4610 struct bfd_link_info
*info
4611 = (struct bfd_link_info
*) inf
;
4613 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4617 /* Finish up undefined weak symbol handling in PIE. Fill its PLT entry
4618 here since undefined weak symbol may not be dynamic and may not be
4619 called for elf_x86_64_finish_dynamic_symbol. */
4622 elf_x86_64_pie_finish_undefweak_symbol (struct bfd_hash_entry
*bh
,
4625 struct elf_link_hash_entry
*h
= (struct elf_link_hash_entry
*) bh
;
4626 struct bfd_link_info
*info
= (struct bfd_link_info
*) inf
;
4628 if (h
->root
.type
!= bfd_link_hash_undefweak
4629 || h
->dynindx
!= -1)
4632 return elf_x86_64_finish_dynamic_symbol (info
->output_bfd
,
4636 /* Used to decide how to sort relocs in an optimal manner for the
4637 dynamic linker, before writing them out. */
4639 static enum elf_reloc_type_class
4640 elf_x86_64_reloc_type_class (const struct bfd_link_info
*info
,
4641 const asection
*rel_sec ATTRIBUTE_UNUSED
,
4642 const Elf_Internal_Rela
*rela
)
4644 bfd
*abfd
= info
->output_bfd
;
4645 const struct elf_backend_data
*bed
= get_elf_backend_data (abfd
);
4646 struct elf_x86_link_hash_table
*htab
4647 = elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4649 if (htab
->elf
.dynsym
!= NULL
4650 && htab
->elf
.dynsym
->contents
!= NULL
)
4652 /* Check relocation against STT_GNU_IFUNC symbol if there are
4654 unsigned long r_symndx
= htab
->r_sym (rela
->r_info
);
4655 if (r_symndx
!= STN_UNDEF
)
4657 Elf_Internal_Sym sym
;
4658 if (!bed
->s
->swap_symbol_in (abfd
,
4659 (htab
->elf
.dynsym
->contents
4660 + r_symndx
* bed
->s
->sizeof_sym
),
4664 if (ELF_ST_TYPE (sym
.st_info
) == STT_GNU_IFUNC
)
4665 return reloc_class_ifunc
;
4669 switch ((int) ELF32_R_TYPE (rela
->r_info
))
4671 case R_X86_64_IRELATIVE
:
4672 return reloc_class_ifunc
;
4673 case R_X86_64_RELATIVE
:
4674 case R_X86_64_RELATIVE64
:
4675 return reloc_class_relative
;
4676 case R_X86_64_JUMP_SLOT
:
4677 return reloc_class_plt
;
4679 return reloc_class_copy
;
4681 return reloc_class_normal
;
4685 /* Finish up the dynamic sections. */
4688 elf_x86_64_finish_dynamic_sections (bfd
*output_bfd
,
4689 struct bfd_link_info
*info
)
4691 struct elf_x86_link_hash_table
*htab
;
4693 htab
= _bfd_x86_elf_finish_dynamic_sections (output_bfd
, info
);
4697 if (! htab
->elf
.dynamic_sections_created
)
4700 if (htab
->elf
.splt
&& htab
->elf
.splt
->size
> 0)
4702 if (bfd_is_abs_section (htab
->elf
.splt
->output_section
))
4704 info
->callbacks
->einfo
4705 (_("%F%P: discarded output section: `%pA'\n"),
4710 elf_section_data (htab
->elf
.splt
->output_section
)
4711 ->this_hdr
.sh_entsize
= htab
->plt
.plt_entry_size
;
4713 if (htab
->plt
.has_plt0
)
4715 /* Fill in the special first entry in the procedure linkage
4717 memcpy (htab
->elf
.splt
->contents
,
4718 htab
->lazy_plt
->plt0_entry
,
4719 htab
->lazy_plt
->plt0_entry_size
);
4720 /* Add offset for pushq GOT+8(%rip), since the instruction
4721 uses 6 bytes subtract this value. */
4722 bfd_put_32 (output_bfd
,
4723 (htab
->elf
.sgotplt
->output_section
->vma
4724 + htab
->elf
.sgotplt
->output_offset
4726 - htab
->elf
.splt
->output_section
->vma
4727 - htab
->elf
.splt
->output_offset
4729 (htab
->elf
.splt
->contents
4730 + htab
->lazy_plt
->plt0_got1_offset
));
4731 /* Add offset for the PC-relative instruction accessing
4732 GOT+16, subtracting the offset to the end of that
4734 bfd_put_32 (output_bfd
,
4735 (htab
->elf
.sgotplt
->output_section
->vma
4736 + htab
->elf
.sgotplt
->output_offset
4738 - htab
->elf
.splt
->output_section
->vma
4739 - htab
->elf
.splt
->output_offset
4740 - htab
->lazy_plt
->plt0_got2_insn_end
),
4741 (htab
->elf
.splt
->contents
4742 + htab
->lazy_plt
->plt0_got2_offset
));
4745 if (htab
->elf
.tlsdesc_plt
)
4747 bfd_put_64 (output_bfd
, (bfd_vma
) 0,
4748 htab
->elf
.sgot
->contents
+ htab
->elf
.tlsdesc_got
);
4750 memcpy (htab
->elf
.splt
->contents
+ htab
->elf
.tlsdesc_plt
,
4751 htab
->lazy_plt
->plt_tlsdesc_entry
,
4752 htab
->lazy_plt
->plt_tlsdesc_entry_size
);
4754 /* Add offset for pushq GOT+8(%rip), since ENDBR64 uses 4
4755 bytes and the instruction uses 6 bytes, subtract these
4757 bfd_put_32 (output_bfd
,
4758 (htab
->elf
.sgotplt
->output_section
->vma
4759 + htab
->elf
.sgotplt
->output_offset
4761 - htab
->elf
.splt
->output_section
->vma
4762 - htab
->elf
.splt
->output_offset
4763 - htab
->elf
.tlsdesc_plt
4764 - htab
->lazy_plt
->plt_tlsdesc_got1_insn_end
),
4765 (htab
->elf
.splt
->contents
4766 + htab
->elf
.tlsdesc_plt
4767 + htab
->lazy_plt
->plt_tlsdesc_got1_offset
));
4768 /* Add offset for indirect branch via GOT+TDG, where TDG
4769 stands for htab->tlsdesc_got, subtracting the offset
4770 to the end of that instruction. */
4771 bfd_put_32 (output_bfd
,
4772 (htab
->elf
.sgot
->output_section
->vma
4773 + htab
->elf
.sgot
->output_offset
4774 + htab
->elf
.tlsdesc_got
4775 - htab
->elf
.splt
->output_section
->vma
4776 - htab
->elf
.splt
->output_offset
4777 - htab
->elf
.tlsdesc_plt
4778 - htab
->lazy_plt
->plt_tlsdesc_got2_insn_end
),
4779 (htab
->elf
.splt
->contents
4780 + htab
->elf
.tlsdesc_plt
4781 + htab
->lazy_plt
->plt_tlsdesc_got2_offset
));
4785 /* Fill PLT entries for undefined weak symbols in PIE. */
4786 if (bfd_link_pie (info
))
4787 bfd_hash_traverse (&info
->hash
->table
,
4788 elf_x86_64_pie_finish_undefweak_symbol
,
4794 /* Fill PLT/GOT entries and allocate dynamic relocations for local
4795 STT_GNU_IFUNC symbols, which aren't in the ELF linker hash table.
4796 It has to be done before elf_link_sort_relocs is called so that
4797 dynamic relocations are properly sorted. */
4800 elf_x86_64_output_arch_local_syms
4801 (bfd
*output_bfd ATTRIBUTE_UNUSED
,
4802 struct bfd_link_info
*info
,
4803 void *flaginfo ATTRIBUTE_UNUSED
,
4804 int (*func
) (void *, const char *,
4807 struct elf_link_hash_entry
*) ATTRIBUTE_UNUSED
)
4809 struct elf_x86_link_hash_table
*htab
4810 = elf_x86_hash_table (info
, X86_64_ELF_DATA
);
4814 /* Fill PLT and GOT entries for local STT_GNU_IFUNC symbols. */
4815 htab_traverse (htab
->loc_hash_table
,
4816 elf_x86_64_finish_local_dynamic_symbol
,
4822 /* Similar to _bfd_elf_get_synthetic_symtab. Support PLTs with all
4823 dynamic relocations. */
4826 elf_x86_64_get_synthetic_symtab (bfd
*abfd
,
4827 long symcount ATTRIBUTE_UNUSED
,
4828 asymbol
**syms ATTRIBUTE_UNUSED
,
4835 bfd_byte
*plt_contents
;
4837 const struct elf_x86_lazy_plt_layout
*lazy_plt
;
4838 const struct elf_x86_non_lazy_plt_layout
*non_lazy_plt
;
4839 const struct elf_x86_lazy_plt_layout
*lazy_bnd_plt
;
4840 const struct elf_x86_non_lazy_plt_layout
*non_lazy_bnd_plt
;
4841 const struct elf_x86_lazy_plt_layout
*lazy_ibt_plt
;
4842 const struct elf_x86_non_lazy_plt_layout
*non_lazy_ibt_plt
;
4844 enum elf_x86_plt_type plt_type
;
4845 struct elf_x86_plt plts
[] =
4847 { ".plt", NULL
, NULL
, plt_unknown
, 0, 0, 0, 0 },
4848 { ".plt.got", NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 },
4849 { ".plt.sec", NULL
, NULL
, plt_second
, 0, 0, 0, 0 },
4850 { ".plt.bnd", NULL
, NULL
, plt_second
, 0, 0, 0, 0 },
4851 { NULL
, NULL
, NULL
, plt_non_lazy
, 0, 0, 0, 0 }
4856 if ((abfd
->flags
& (DYNAMIC
| EXEC_P
)) == 0)
4859 if (dynsymcount
<= 0)
4862 relsize
= bfd_get_dynamic_reloc_upper_bound (abfd
);
4866 lazy_plt
= &elf_x86_64_lazy_plt
;
4867 non_lazy_plt
= &elf_x86_64_non_lazy_plt
;
4868 lazy_bnd_plt
= &elf_x86_64_lazy_bnd_plt
;
4869 non_lazy_bnd_plt
= &elf_x86_64_non_lazy_bnd_plt
;
4870 if (ABI_64_P (abfd
))
4872 lazy_ibt_plt
= &elf_x86_64_lazy_ibt_plt
;
4873 non_lazy_ibt_plt
= &elf_x86_64_non_lazy_ibt_plt
;
4877 lazy_ibt_plt
= &elf_x32_lazy_ibt_plt
;
4878 non_lazy_ibt_plt
= &elf_x32_non_lazy_ibt_plt
;
4882 for (j
= 0; plts
[j
].name
!= NULL
; j
++)
4884 plt
= bfd_get_section_by_name (abfd
, plts
[j
].name
);
4885 if (plt
== NULL
|| plt
->size
== 0)
4888 /* Get the PLT section contents. */
4889 if (!bfd_malloc_and_get_section (abfd
, plt
, &plt_contents
))
4892 /* Check what kind of PLT it is. */
4893 plt_type
= plt_unknown
;
4894 if (plts
[j
].type
== plt_unknown
4895 && (plt
->size
>= (lazy_plt
->plt_entry_size
4896 + lazy_plt
->plt_entry_size
)))
4898 /* Match lazy PLT first. Need to check the first two
4900 if ((memcmp (plt_contents
, lazy_plt
->plt0_entry
,
4901 lazy_plt
->plt0_got1_offset
) == 0)
4902 && (memcmp (plt_contents
+ 6, lazy_plt
->plt0_entry
+ 6,
4904 plt_type
= plt_lazy
;
4905 else if (lazy_bnd_plt
!= NULL
4906 && (memcmp (plt_contents
, lazy_bnd_plt
->plt0_entry
,
4907 lazy_bnd_plt
->plt0_got1_offset
) == 0)
4908 && (memcmp (plt_contents
+ 6,
4909 lazy_bnd_plt
->plt0_entry
+ 6, 3) == 0))
4911 plt_type
= plt_lazy
| plt_second
;
4912 /* The fist entry in the lazy IBT PLT is the same as the
4914 if ((memcmp (plt_contents
+ lazy_ibt_plt
->plt_entry_size
,
4915 lazy_ibt_plt
->plt_entry
,
4916 lazy_ibt_plt
->plt_got_offset
) == 0))
4917 lazy_plt
= lazy_ibt_plt
;
4919 lazy_plt
= lazy_bnd_plt
;
4923 if (non_lazy_plt
!= NULL
4924 && (plt_type
== plt_unknown
|| plt_type
== plt_non_lazy
)
4925 && plt
->size
>= non_lazy_plt
->plt_entry_size
)
4927 /* Match non-lazy PLT. */
4928 if (memcmp (plt_contents
, non_lazy_plt
->plt_entry
,
4929 non_lazy_plt
->plt_got_offset
) == 0)
4930 plt_type
= plt_non_lazy
;
4933 if (plt_type
== plt_unknown
|| plt_type
== plt_second
)
4935 if (non_lazy_bnd_plt
!= NULL
4936 && plt
->size
>= non_lazy_bnd_plt
->plt_entry_size
4937 && (memcmp (plt_contents
, non_lazy_bnd_plt
->plt_entry
,
4938 non_lazy_bnd_plt
->plt_got_offset
) == 0))
4940 /* Match BND PLT. */
4941 plt_type
= plt_second
;
4942 non_lazy_plt
= non_lazy_bnd_plt
;
4944 else if (non_lazy_ibt_plt
!= NULL
4945 && plt
->size
>= non_lazy_ibt_plt
->plt_entry_size
4946 && (memcmp (plt_contents
,
4947 non_lazy_ibt_plt
->plt_entry
,
4948 non_lazy_ibt_plt
->plt_got_offset
) == 0))
4950 /* Match IBT PLT. */
4951 plt_type
= plt_second
;
4952 non_lazy_plt
= non_lazy_ibt_plt
;
4956 if (plt_type
== plt_unknown
)
4958 free (plt_contents
);
4963 plts
[j
].type
= plt_type
;
4965 if ((plt_type
& plt_lazy
))
4967 plts
[j
].plt_got_offset
= lazy_plt
->plt_got_offset
;
4968 plts
[j
].plt_got_insn_size
= lazy_plt
->plt_got_insn_size
;
4969 plts
[j
].plt_entry_size
= lazy_plt
->plt_entry_size
;
4970 /* Skip PLT0 in lazy PLT. */
4975 plts
[j
].plt_got_offset
= non_lazy_plt
->plt_got_offset
;
4976 plts
[j
].plt_got_insn_size
= non_lazy_plt
->plt_got_insn_size
;
4977 plts
[j
].plt_entry_size
= non_lazy_plt
->plt_entry_size
;
4981 /* Skip lazy PLT when the second PLT is used. */
4982 if (plt_type
== (plt_lazy
| plt_second
))
4986 n
= plt
->size
/ plts
[j
].plt_entry_size
;
4991 plts
[j
].contents
= plt_contents
;
4994 return _bfd_x86_elf_get_synthetic_symtab (abfd
, count
, relsize
,
4995 (bfd_vma
) 0, plts
, dynsyms
,
4999 /* Handle an x86-64 specific section when reading an object file. This
5000 is called when elfcode.h finds a section with an unknown type. */
5003 elf_x86_64_section_from_shdr (bfd
*abfd
, Elf_Internal_Shdr
*hdr
,
5004 const char *name
, int shindex
)
5006 if (hdr
->sh_type
!= SHT_X86_64_UNWIND
)
5009 if (! _bfd_elf_make_section_from_shdr (abfd
, hdr
, name
, shindex
))
5015 /* Hook called by the linker routine which adds symbols from an object
5016 file. We use it to put SHN_X86_64_LCOMMON items in .lbss, instead
5020 elf_x86_64_add_symbol_hook (bfd
*abfd
,
5021 struct bfd_link_info
*info ATTRIBUTE_UNUSED
,
5022 Elf_Internal_Sym
*sym
,
5023 const char **namep ATTRIBUTE_UNUSED
,
5024 flagword
*flagsp ATTRIBUTE_UNUSED
,
5030 switch (sym
->st_shndx
)
5032 case SHN_X86_64_LCOMMON
:
5033 lcomm
= bfd_get_section_by_name (abfd
, "LARGE_COMMON");
5036 lcomm
= bfd_make_section_with_flags (abfd
,
5040 | SEC_LINKER_CREATED
));
5043 elf_section_flags (lcomm
) |= SHF_X86_64_LARGE
;
5046 *valp
= sym
->st_size
;
5054 /* Given a BFD section, try to locate the corresponding ELF section
5058 elf_x86_64_elf_section_from_bfd_section (bfd
*abfd ATTRIBUTE_UNUSED
,
5059 asection
*sec
, int *index_return
)
5061 if (sec
== &_bfd_elf_large_com_section
)
5063 *index_return
= SHN_X86_64_LCOMMON
;
5069 /* Process a symbol. */
5072 elf_x86_64_symbol_processing (bfd
*abfd ATTRIBUTE_UNUSED
,
5075 elf_symbol_type
*elfsym
= (elf_symbol_type
*) asym
;
5077 switch (elfsym
->internal_elf_sym
.st_shndx
)
5079 case SHN_X86_64_LCOMMON
:
5080 asym
->section
= &_bfd_elf_large_com_section
;
5081 asym
->value
= elfsym
->internal_elf_sym
.st_size
;
5082 /* Common symbol doesn't set BSF_GLOBAL. */
5083 asym
->flags
&= ~BSF_GLOBAL
;
5089 elf_x86_64_common_definition (Elf_Internal_Sym
*sym
)
5091 return (sym
->st_shndx
== SHN_COMMON
5092 || sym
->st_shndx
== SHN_X86_64_LCOMMON
);
5096 elf_x86_64_common_section_index (asection
*sec
)
5098 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5101 return SHN_X86_64_LCOMMON
;
5105 elf_x86_64_common_section (asection
*sec
)
5107 if ((elf_section_flags (sec
) & SHF_X86_64_LARGE
) == 0)
5108 return bfd_com_section_ptr
;
5110 return &_bfd_elf_large_com_section
;
5114 elf_x86_64_merge_symbol (struct elf_link_hash_entry
*h
,
5115 const Elf_Internal_Sym
*sym
,
5120 const asection
*oldsec
)
5122 /* A normal common symbol and a large common symbol result in a
5123 normal common symbol. We turn the large common symbol into a
5126 && h
->root
.type
== bfd_link_hash_common
5128 && bfd_is_com_section (*psec
)
5131 if (sym
->st_shndx
== SHN_COMMON
5132 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) != 0)
5134 h
->root
.u
.c
.p
->section
5135 = bfd_make_section_old_way (oldbfd
, "COMMON");
5136 h
->root
.u
.c
.p
->section
->flags
= SEC_ALLOC
;
5138 else if (sym
->st_shndx
== SHN_X86_64_LCOMMON
5139 && (elf_section_flags (oldsec
) & SHF_X86_64_LARGE
) == 0)
5140 *psec
= bfd_com_section_ptr
;
5147 elf_x86_64_additional_program_headers (bfd
*abfd
,
5148 struct bfd_link_info
*info ATTRIBUTE_UNUSED
)
5153 /* Check to see if we need a large readonly segment. */
5154 s
= bfd_get_section_by_name (abfd
, ".lrodata");
5155 if (s
&& (s
->flags
& SEC_LOAD
))
5158 /* Check to see if we need a large data segment. Since .lbss sections
5159 is placed right after the .bss section, there should be no need for
5160 a large data segment just because of .lbss. */
5161 s
= bfd_get_section_by_name (abfd
, ".ldata");
5162 if (s
&& (s
->flags
& SEC_LOAD
))
5168 /* Return TRUE iff relocations for INPUT are compatible with OUTPUT. */
5171 elf_x86_64_relocs_compatible (const bfd_target
*input
,
5172 const bfd_target
*output
)
5174 return ((xvec_get_elf_backend_data (input
)->s
->elfclass
5175 == xvec_get_elf_backend_data (output
)->s
->elfclass
)
5176 && _bfd_elf_relocs_compatible (input
, output
));
5179 /* Set up x86-64 GNU properties. Return the first relocatable ELF input
5180 with GNU properties if found. Otherwise, return NULL. */
5183 elf_x86_64_link_setup_gnu_properties (struct bfd_link_info
*info
)
5185 struct elf_x86_init_table init_table
;
5186 const struct elf_backend_data
*bed
;
5187 struct elf_x86_link_hash_table
*htab
;
5189 if ((int) R_X86_64_standard
>= (int) R_X86_64_converted_reloc_bit
5190 || (int) R_X86_64_max
<= (int) R_X86_64_converted_reloc_bit
5191 || ((int) (R_X86_64_GNU_VTINHERIT
| R_X86_64_converted_reloc_bit
)
5192 != (int) R_X86_64_GNU_VTINHERIT
)
5193 || ((int) (R_X86_64_GNU_VTENTRY
| R_X86_64_converted_reloc_bit
)
5194 != (int) R_X86_64_GNU_VTENTRY
))
5197 /* This is unused for x86-64. */
5198 init_table
.plt0_pad_byte
= 0x90;
5200 bed
= get_elf_backend_data (info
->output_bfd
);
5201 htab
= elf_x86_hash_table (info
, bed
->target_id
);
5204 if (htab
->params
->bndplt
)
5206 init_table
.lazy_plt
= &elf_x86_64_lazy_bnd_plt
;
5207 init_table
.non_lazy_plt
= &elf_x86_64_non_lazy_bnd_plt
;
5211 init_table
.lazy_plt
= &elf_x86_64_lazy_plt
;
5212 init_table
.non_lazy_plt
= &elf_x86_64_non_lazy_plt
;
5215 if (ABI_64_P (info
->output_bfd
))
5217 init_table
.lazy_ibt_plt
= &elf_x86_64_lazy_ibt_plt
;
5218 init_table
.non_lazy_ibt_plt
= &elf_x86_64_non_lazy_ibt_plt
;
5222 init_table
.lazy_ibt_plt
= &elf_x32_lazy_ibt_plt
;
5223 init_table
.non_lazy_ibt_plt
= &elf_x32_non_lazy_ibt_plt
;
5226 if (ABI_64_P (info
->output_bfd
))
5228 init_table
.r_info
= elf64_r_info
;
5229 init_table
.r_sym
= elf64_r_sym
;
5233 init_table
.r_info
= elf32_r_info
;
5234 init_table
.r_sym
= elf32_r_sym
;
5237 return _bfd_x86_elf_link_setup_gnu_properties (info
, &init_table
);
5240 static const struct bfd_elf_special_section
5241 elf_x86_64_special_sections
[]=
5243 { STRING_COMMA_LEN (".gnu.linkonce.lb"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5244 { STRING_COMMA_LEN (".gnu.linkonce.lr"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5245 { STRING_COMMA_LEN (".gnu.linkonce.lt"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_EXECINSTR
+ SHF_X86_64_LARGE
},
5246 { STRING_COMMA_LEN (".lbss"), -2, SHT_NOBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5247 { STRING_COMMA_LEN (".ldata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_WRITE
+ SHF_X86_64_LARGE
},
5248 { STRING_COMMA_LEN (".lrodata"), -2, SHT_PROGBITS
, SHF_ALLOC
+ SHF_X86_64_LARGE
},
5249 { NULL
, 0, 0, 0, 0 }
5252 #define TARGET_LITTLE_SYM x86_64_elf64_vec
5253 #define TARGET_LITTLE_NAME "elf64-x86-64"
5254 #define ELF_ARCH bfd_arch_i386
5255 #define ELF_TARGET_ID X86_64_ELF_DATA
5256 #define ELF_MACHINE_CODE EM_X86_64
5257 #if DEFAULT_LD_Z_SEPARATE_CODE
5258 # define ELF_MAXPAGESIZE 0x1000
5260 # define ELF_MAXPAGESIZE 0x200000
5262 #define ELF_COMMONPAGESIZE 0x1000
5264 #define elf_backend_can_gc_sections 1
5265 #define elf_backend_can_refcount 1
5266 #define elf_backend_want_got_plt 1
5267 #define elf_backend_plt_readonly 1
5268 #define elf_backend_want_plt_sym 0
5269 #define elf_backend_got_header_size (GOT_ENTRY_SIZE*3)
5270 #define elf_backend_rela_normal 1
5271 #define elf_backend_plt_alignment 4
5272 #define elf_backend_extern_protected_data 1
5273 #define elf_backend_caches_rawsize 1
5274 #define elf_backend_dtrel_excludes_plt 1
5275 #define elf_backend_want_dynrelro 1
5277 #define elf_info_to_howto elf_x86_64_info_to_howto
5279 #define bfd_elf64_bfd_reloc_type_lookup elf_x86_64_reloc_type_lookup
5280 #define bfd_elf64_bfd_reloc_name_lookup \
5281 elf_x86_64_reloc_name_lookup
5283 #define elf_backend_relocs_compatible elf_x86_64_relocs_compatible
5284 #define elf_backend_always_size_sections elf_x86_64_always_size_sections
5285 #define elf_backend_create_dynamic_sections _bfd_elf_create_dynamic_sections
5286 #define elf_backend_finish_dynamic_sections elf_x86_64_finish_dynamic_sections
5287 #define elf_backend_finish_dynamic_symbol elf_x86_64_finish_dynamic_symbol
5288 #define elf_backend_output_arch_local_syms elf_x86_64_output_arch_local_syms
5289 #define elf_backend_grok_prstatus elf_x86_64_grok_prstatus
5290 #define elf_backend_grok_psinfo elf_x86_64_grok_psinfo
5292 #define elf_backend_write_core_note elf_x86_64_write_core_note
5294 #define elf_backend_reloc_type_class elf_x86_64_reloc_type_class
5295 #define elf_backend_relocate_section elf_x86_64_relocate_section
5296 #define elf_backend_init_index_section _bfd_elf_init_1_index_section
5297 #define elf_backend_object_p elf64_x86_64_elf_object_p
5298 #define bfd_elf64_get_synthetic_symtab elf_x86_64_get_synthetic_symtab
5300 #define elf_backend_section_from_shdr \
5301 elf_x86_64_section_from_shdr
5303 #define elf_backend_section_from_bfd_section \
5304 elf_x86_64_elf_section_from_bfd_section
5305 #define elf_backend_add_symbol_hook \
5306 elf_x86_64_add_symbol_hook
5307 #define elf_backend_symbol_processing \
5308 elf_x86_64_symbol_processing
5309 #define elf_backend_common_section_index \
5310 elf_x86_64_common_section_index
5311 #define elf_backend_common_section \
5312 elf_x86_64_common_section
5313 #define elf_backend_common_definition \
5314 elf_x86_64_common_definition
5315 #define elf_backend_merge_symbol \
5316 elf_x86_64_merge_symbol
5317 #define elf_backend_special_sections \
5318 elf_x86_64_special_sections
5319 #define elf_backend_additional_program_headers \
5320 elf_x86_64_additional_program_headers
5321 #define elf_backend_setup_gnu_properties \
5322 elf_x86_64_link_setup_gnu_properties
5323 #define elf_backend_hide_symbol \
5324 _bfd_x86_elf_hide_symbol
5327 #define elf64_bed elf64_x86_64_bed
5329 #include "elf64-target.h"
5331 /* CloudABI support. */
5333 #undef TARGET_LITTLE_SYM
5334 #define TARGET_LITTLE_SYM x86_64_elf64_cloudabi_vec
5335 #undef TARGET_LITTLE_NAME
5336 #define TARGET_LITTLE_NAME "elf64-x86-64-cloudabi"
5339 #define ELF_OSABI ELFOSABI_CLOUDABI
5342 #define elf64_bed elf64_x86_64_cloudabi_bed
5344 #include "elf64-target.h"
5346 /* FreeBSD support. */
5348 #undef TARGET_LITTLE_SYM
5349 #define TARGET_LITTLE_SYM x86_64_elf64_fbsd_vec
5350 #undef TARGET_LITTLE_NAME
5351 #define TARGET_LITTLE_NAME "elf64-x86-64-freebsd"
5354 #define ELF_OSABI ELFOSABI_FREEBSD
5357 #define elf64_bed elf64_x86_64_fbsd_bed
5359 #include "elf64-target.h"
5361 /* Solaris 2 support. */
5363 #undef TARGET_LITTLE_SYM
5364 #define TARGET_LITTLE_SYM x86_64_elf64_sol2_vec
5365 #undef TARGET_LITTLE_NAME
5366 #define TARGET_LITTLE_NAME "elf64-x86-64-sol2"
5368 #undef ELF_TARGET_OS
5369 #define ELF_TARGET_OS is_solaris
5371 /* Restore default: we cannot use ELFOSABI_SOLARIS, otherwise ELFOSABI_NONE
5372 objects won't be recognized. */
5376 #define elf64_bed elf64_x86_64_sol2_bed
5378 /* The 64-bit static TLS arena size is rounded to the nearest 16-byte
5380 #undef elf_backend_static_tls_alignment
5381 #define elf_backend_static_tls_alignment 16
5383 /* The Solaris 2 ABI requires a plt symbol on all platforms.
5385 Cf. Linker and Libraries Guide, Ch. 2, Link-Editor, Generating the Output
5387 #undef elf_backend_want_plt_sym
5388 #define elf_backend_want_plt_sym 1
5390 #undef elf_backend_strtab_flags
5391 #define elf_backend_strtab_flags SHF_STRINGS
5394 elf64_x86_64_copy_solaris_special_section_fields (const bfd
*ibfd ATTRIBUTE_UNUSED
,
5395 bfd
*obfd ATTRIBUTE_UNUSED
,
5396 const Elf_Internal_Shdr
*isection ATTRIBUTE_UNUSED
,
5397 Elf_Internal_Shdr
*osection ATTRIBUTE_UNUSED
)
5399 /* PR 19938: FIXME: Need to add code for setting the sh_info
5400 and sh_link fields of Solaris specific section types. */
5404 #undef elf_backend_copy_special_section_fields
5405 #define elf_backend_copy_special_section_fields elf64_x86_64_copy_solaris_special_section_fields
5407 #include "elf64-target.h"
5409 /* Restore defaults. */
5411 #undef elf_backend_static_tls_alignment
5412 #undef elf_backend_want_plt_sym
5413 #define elf_backend_want_plt_sym 0
5414 #undef elf_backend_strtab_flags
5415 #undef elf_backend_copy_special_section_fields
5417 /* 32bit x86-64 support. */
5419 #undef TARGET_LITTLE_SYM
5420 #define TARGET_LITTLE_SYM x86_64_elf32_vec
5421 #undef TARGET_LITTLE_NAME
5422 #define TARGET_LITTLE_NAME "elf32-x86-64"
5424 #define elf32_bed elf32_x86_64_bed
5427 #define ELF_ARCH bfd_arch_i386
5429 #undef ELF_MACHINE_CODE
5430 #define ELF_MACHINE_CODE EM_X86_64
5432 #undef ELF_TARGET_OS
5435 #define bfd_elf32_bfd_reloc_type_lookup \
5436 elf_x86_64_reloc_type_lookup
5437 #define bfd_elf32_bfd_reloc_name_lookup \
5438 elf_x86_64_reloc_name_lookup
5439 #define bfd_elf32_get_synthetic_symtab \
5440 elf_x86_64_get_synthetic_symtab
5442 #undef elf_backend_object_p
5443 #define elf_backend_object_p \
5444 elf32_x86_64_elf_object_p
5446 #undef elf_backend_bfd_from_remote_memory
5447 #define elf_backend_bfd_from_remote_memory \
5448 _bfd_elf32_bfd_from_remote_memory
5450 #undef elf_backend_size_info
5451 #define elf_backend_size_info \
5452 _bfd_elf32_size_info
5454 #include "elf32-target.h"