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+/* Copyright (C) 2003-2017 Free Software Foundation, Inc.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library. If not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#ifndef _RISCV32_ATOMIC_MACHINE_H
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+#define _RISCV32_ATOMIC_MACHINE_H 1
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+
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+#define typeof __typeof__
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+
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+#include <stdint.h>
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+#include <sysdep.h>
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+
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+typedef int8_t atomic8_t;
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+typedef int16_t atomic16_t;
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+typedef int32_t atomic32_t;
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+typedef int64_t atomic64_t;
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+
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+typedef uint8_t uatomic8_t;
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+typedef uint16_t uatomic16_t;
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+typedef uint32_t uatomic32_t;
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+typedef uint64_t uatomic64_t;
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+
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+typedef intptr_t atomicptr_t;
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+typedef uintptr_t uatomicptr_t;
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+typedef intmax_t atomic_max_t;
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+typedef uintmax_t uatomic_max_t;
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+
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+#define __HAVE_64B_ATOMICS 1
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+#define USE_ATOMIC_COMPILER_BUILTINS 1
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+
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+/* Compare and exchange.
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+ For all "bool" routines, we return FALSE if exchange succesful. */
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+
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+# define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ })
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+
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+# define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ })
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+
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+# define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ })
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+
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+# define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ })
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+
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+# define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ __oldval; \
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+ })
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+
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+# define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ __oldval; \
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+ })
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+
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+# define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ __oldval; \
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+ })
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+
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+# define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
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+ ({ \
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+ typeof (*mem) __oldval = (oldval); \
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+ __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, \
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+ model, __ATOMIC_RELAXED); \
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+ __oldval; \
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+ })
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+
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+
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+/* Compare and exchange with "acquire" semantics, ie barrier after. */
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+
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+# define atomic_compare_and_exchange_bool_acq(mem, new, old) \
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+ __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, \
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+ mem, new, old, __ATOMIC_ACQUIRE)
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+
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+# define atomic_compare_and_exchange_val_acq(mem, new, old) \
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+ __atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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+ mem, new, old, __ATOMIC_ACQUIRE)
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+
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+/* Compare and exchange with "release" semantics, ie barrier before. */
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+
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+# define atomic_compare_and_exchange_val_rel(mem, new, old) \
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+ __atomic_val_bysize (__arch_compare_and_exchange_val, int, \
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+ mem, new, old, __ATOMIC_RELEASE)
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+
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+
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+/* Atomic exchange (without compare). */
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+
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+# define __arch_exchange_8_int(mem, newval, model) \
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+ __atomic_exchange_n (mem, newval, model)
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+
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+# define __arch_exchange_16_int(mem, newval, model) \
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+ __atomic_exchange_n (mem, newval, model)
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+
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+# define __arch_exchange_32_int(mem, newval, model) \
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+ __atomic_exchange_n (mem, newval, model)
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+
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+# define __arch_exchange_64_int(mem, newval, model) \
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+ __atomic_exchange_n (mem, newval, model)
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+
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+# define atomic_exchange_acq(mem, value) \
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+ __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)
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+
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+# define atomic_exchange_rel(mem, value) \
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+ __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)
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+
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+
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+/* Atomically add value and return the previous (unincremented) value. */
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+
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+# define __arch_exchange_and_add_8_int(mem, value, model) \
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+ __atomic_fetch_add (mem, value, model)
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+
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+# define __arch_exchange_and_add_16_int(mem, value, model) \
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+ __atomic_fetch_add (mem, value, model)
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+
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+# define __arch_exchange_and_add_32_int(mem, value, model) \
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+ __atomic_fetch_add (mem, value, model)
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+
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+# define __arch_exchange_and_add_64_int(mem, value, model) \
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+ __atomic_fetch_add (mem, value, model)
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+
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+# define atomic_exchange_and_add_acq(mem, value) \
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+ __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
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+ __ATOMIC_ACQUIRE)
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+
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+# define atomic_exchange_and_add_rel(mem, value) \
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+ __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
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+ __ATOMIC_RELEASE)
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+
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+/* Barrier macro. */
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+#define atomic_full_barrier() __sync_synchronize()
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+
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+#endif
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Waldemar Brodkorb