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/* Copyright (C) 2010-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Maxim Kuvyrkov <maxim@codesourcery.com>, 2010.
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 _ATOMIC_MACHINE_H
#define _ATOMIC_MACHINE_H 1
#include <stdint.h>
#include <sysdep.h>
/* Coldfire has no atomic compare-and-exchange operation, but the
kernel provides userspace atomicity operations. Use them. */
typedef int32_t atomic32_t;
typedef uint32_t uatomic32_t;
typedef int_fast32_t atomic_fast32_t;
typedef uint_fast32_t uatomic_fast32_t;
typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;
#define __HAVE_64B_ATOMICS 0
#define USE_ATOMIC_COMPILER_BUILTINS 0
/* XXX Is this actually correct? */
#define ATOMIC_EXCHANGE_USES_CAS 1
/* The only basic operation needed is compare and exchange. */
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
({ \
/* Use temporary variables to workaround call-clobberness of \
the registers. */ \
__typeof (mem) _mem = mem; \
__typeof (oldval) _oldval = oldval; \
__typeof (newval) _newval = newval; \
register uint32_t _d0 asm ("d0") = SYS_ify (atomic_cmpxchg_32); \
register uint32_t *_a0 asm ("a0") = (uint32_t *) _mem; \
register uint32_t _d2 asm ("d2") = (uint32_t) _oldval; \
register uint32_t _d1 asm ("d1") = (uint32_t) _newval; \
\
asm ("trap #0" \
: "+d" (_d0), "+m" (*_a0) \
: "a" (_a0), "d" (_d2), "d" (_d1)); \
(__typeof (oldval)) _d0; \
})
# define atomic_full_barrier() \
(INTERNAL_SYSCALL_CALL (atomic_barrier), (void) 0)
#endif
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