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/* RISC-V instruction cache flushing VDSO calls
Copyright (C) 2017-2018 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
<http://www.gnu.org/licenses/>. */
#include <dl-vdso.h>
#include <stdlib.h>
#include <atomic.h>
#include <sys/cachectl.h>
#if __has_include__ (<asm/syscalls.h>)
# include <asm/syscalls.h>
#else
# include <asm/unistd.h>
#endif
typedef int (*func_type) (void *, void *, unsigned long int);
static int
__riscv_flush_icache_syscall (void *start, void *end, unsigned long int flags)
{
return INLINE_SYSCALL (riscv_flush_icache, 3, start, end, flags);
}
static func_type
__lookup_riscv_flush_icache (void)
{
PREPARE_VERSION_KNOWN (linux_version, LINUX_4_15);
func_type func = _dl_vdso_vsym ("__vdso_flush_icache", &linux_version);
/* If there is no vDSO entry then call the system call directly. All Linux
versions provide the vDSO entry, but QEMU's user-mode emulation doesn't
provide a vDSO. */
if (!func)
func = &__riscv_flush_icache_syscall;
return func;
}
#ifdef SHARED
# define INIT_ARCH()
libc_ifunc (__riscv_flush_icache, __lookup_riscv_flush_icache ())
#else
int
__riscv_flush_icache (void *start, void *end, unsigned long int flags)
{
static volatile func_type cached_func;
func_type func = atomic_load_relaxed (&cached_func);
if (!func)
{
func = __lookup_riscv_flush_icache ();
atomic_store_relaxed (&cached_func, func);
}
return func (start, end, flags);
}
#endif
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