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/* Machine-dependent ELF indirect relocation inline functions.
AArch64 version.
Copyright (C) 2012-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#ifndef _DL_IREL_H
#define _DL_IREL_H
#include <stdio.h>
#include <ldsodefs.h>
#include <sys/ifunc.h>
#define _IFUNC_ARG_SIZE_VER0 24 /* sizeof 1st published __ifunc_arg_t */
#define _IFUNC_ARG_SIZE_VER1 40 /* sizeof 2nd published __ifunc_arg_t */
#define sizeof_field(TYPE, MEMBER) sizeof ((((TYPE *)0)->MEMBER))
#define offsetofend(TYPE, MEMBER) \
(offsetof (TYPE, MEMBER) + sizeof_field (TYPE, MEMBER))
_Static_assert (sizeof (__ifunc_arg_t) == _IFUNC_ARG_SIZE_VER1,
"sizeof (__ifunc_arg_t) != _IFUNC_ARG_SIZE_VER1");
_Static_assert (_IFUNC_ARG_SIZE_VER1
== (_IFUNC_HWCAP_MAX + 1) * sizeof (unsigned long),
"_IFUNC_ARG_SIZE_VER1 and _IFUNC_HWCAP_MAX mismatch");
#undef offsetofend
#undef sizeof_field
#define ELF_MACHINE_IRELA 1
static inline ElfW(Addr)
__attribute ((always_inline))
elf_ifunc_invoke (ElfW(Addr) addr)
{
__ifunc_arg_t arg;
arg._size = sizeof (arg);
arg._hwcap = GLRO(dl_hwcap);
arg._hwcap2 = GLRO(dl_hwcap2);
arg._hwcap3 = GLRO(dl_hwcap3);
arg._hwcap4 = GLRO(dl_hwcap4);
return ((ElfW(Addr) (*) (uint64_t, const __ifunc_arg_t *)) (addr))
(GLRO(dl_hwcap) | _IFUNC_ARG_HWCAP, &arg);
}
static inline void
__attribute ((always_inline))
elf_irela (const ElfW(Rela) *reloc)
{
ElfW(Addr) *const reloc_addr = (void *) reloc->r_offset;
const unsigned long int r_type = ELFW(R_TYPE) (reloc->r_info);
if (__glibc_likely (r_type == R_AARCH64_IRELATIVE))
{
ElfW(Addr) value = elf_ifunc_invoke (reloc->r_addend);
*reloc_addr = value;
}
else
__libc_fatal ("Unexpected reloc type in static binary.\n");
}
#endif
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