1/* Machine-dependent ELF indirect relocation inline functions.
2 x86-64 version.
3 Copyright (C) 2009-2022 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
10
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <https://www.gnu.org/licenses/>. */
19
20#ifndef _DL_IREL_H
21#define _DL_IREL_H
22
23#include <stdio.h>
24#include <unistd.h>
25
26#define ELF_MACHINE_IRELA 1
27
28static inline ElfW(Addr)
29__attribute ((always_inline))
30elf_ifunc_invoke (ElfW(Addr) addr)
31{
32 return ((ElfW(Addr) (*) (void)) (addr)) ();
33}
34
35static inline void
36__attribute ((always_inline))
37elf_irela (const ElfW(Rela) *reloc)
38{
39 ElfW(Addr) *const reloc_addr = (void *) reloc->r_offset;
40 const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
41
42 if (__glibc_likely (r_type == R_X86_64_IRELATIVE))
43 {
44 ElfW(Addr) value = elf_ifunc_invoke(reloc->r_addend);
45 *reloc_addr = value;
46 }
47 else
48 __libc_fatal ("Unexpected reloc type in static binary.\n");
49}
50
51#endif /* dl-irel.h */
52

source code of glibc/sysdeps/x86_64/dl-irel.h