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/* Copyright (C) 2012 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, write to the Free
Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
Boston, MA 02110-1301, USA. */
#ifndef _BITS_ATOMIC_H
#define _BITS_ATOMIC_H 1
#include <inttypes.h>
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 int64_t atomic64_t;
typedef uint64_t uatomic64_t;
typedef int_fast64_t atomic_fast64_t;
typedef uint_fast64_t uatomic_fast64_t;
typedef intptr_t atomicptr_t;
typedef uintptr_t uatomicptr_t;
typedef intmax_t atomic_max_t;
typedef uintmax_t uatomic_max_t;
/* Xtensa has only a 32-bit form of a store-conditional instruction. */
#define __arch_compare_and_exchange_bool_8_acq(mem, newval, oldval) \
(abort (), 0)
#define __arch_compare_and_exchange_bool_16_acq(mem, newval, oldval) \
(abort (), 0)
#define __arch_compare_and_exchange_bool_8_rel(mem, newval, oldval) \
(abort (), 0)
#define __arch_compare_and_exchange_bool_16_rel(mem, newval, oldval) \
(abort (), 0)
/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
Return the old *MEM value. */
#define __arch_compare_and_exchange_val_32_acq(mem, newval, oldval) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
"1: l32i %1, %2, 0 \n" \
" bne %1, %4, 2f \n" \
" wsr %1, SCOMPARE1 \n" \
" mov %0, %1 \n" \
" mov %1, %3 \n" \
" s32c1i %1, %2, 0 \n" \
" bne %0, %1, 1b \n" \
"2: \n" \
: "=&a" (__value), "=&a" (__tmp) \
: "a" (mem), "a" (newval), "a" (oldval) \
: "memory" ); \
__tmp; \
})
/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
Return zero if *MEM was changed or non-zero if no exchange happened. */
#define __arch_compare_and_exchange_bool_32_acq(mem, newval, oldval) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
"1: l32i %0, %2, 0 \n" \
" sub %1, %4, %0 \n" \
" bnez %1, 2f \n" \
" wsr %0, SCOMPARE1 \n" \
" mov %1, %3 \n" \
" s32c1i %1, %2, 0 \n" \
" bne %0, %1, 1b \n" \
" movi %1, 0 \n" \
"2: \n" \
: "=&a" (__value), "=&a" (__tmp) \
: "a" (mem), "a" (newval), "a" (oldval) \
: "memory" ); \
__tmp != 0; \
})
/* Store NEWVALUE in *MEM and return the old value. */
#define __arch_exchange_32_acq(mem, newval) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
"1: l32i %0, %2, 0 \n" \
" wsr %0, SCOMPARE1 \n" \
" mov %1, %3 \n" \
" s32c1i %1, %2, 0 \n" \
" bne %0, %1, 1b \n" \
: "=&a" (__value), "=&a" (__tmp) \
: "a" (mem), "a" (newval) \
: "memory" ); \
__tmp; \
})
/* Add VALUE to *MEM and return the old value of *MEM. */
#define __arch_atomic_exchange_and_add_32(mem, value) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
"1: l32i %0, %2, 0 \n" \
" wsr %0, SCOMPARE1 \n" \
" add %1, %0, %3 \n" \
" s32c1i %1, %2, 0 \n" \
" bne %0, %1, 1b \n" \
: "=&a" (__value), "=&a" (__tmp) \
: "a" (mem), "a" (value) \
: "memory" ); \
__tmp; \
})
/* Subtract VALUE from *MEM and return the old value of *MEM. */
#define __arch_atomic_exchange_and_sub_32(mem, value) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
"1: l32i %0, %2, 0 \n" \
" wsr %0, SCOMPARE1 \n" \
" sub %1, %0, %3 \n" \
" s32c1i %1, %2, 0 \n" \
" bne %0, %1, 1b \n" \
: "=&a" (__value), "=&a" (__tmp) \
: "a" (mem), "a" (value) \
: "memory" ); \
__tmp; \
})
/* Decrement *MEM if it is > 0, and return the old value. */
#define __arch_atomic_decrement_if_positive_32(mem) \
({__typeof__(*(mem)) __tmp, __value; \
__asm__ __volatile__( \
"1: l32i %0, %2, 0 \n" \
" blti %0, 1, 2f \n" \
" wsr %0, SCOMPARE1 \n" \
" addi %1, %0, -1 \n" \
" s32c1i %1, %2, 0 \n" \
" bne %0, %1, 1b \n" \
"2: \n" \
: "=&a" (__value), "=&a" (__tmp) \
: "a" (mem) \
: "memory" ); \
__tmp; \
})
/* These are the preferred public interfaces: */
#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
({ \
if (sizeof (*mem) != 4) \
abort(); \
__arch_compare_and_exchange_val_32_acq(mem, newval, oldval); \
})
#define atomic_exchange_acq(mem, newval) \
({ \
if (sizeof(*(mem)) != 4) \
abort(); \
__arch_exchange_32_acq(mem, newval); \
})
#define atomic_exchange_and_add(mem, newval) \
({ \
if (sizeof(*(mem)) != 4) \
abort(); \
__arch_atomic_exchange_and_add_32(mem, newval); \
})
#define atomic_exchange_and_sub(mem, newval) \
({ \
if (sizeof(*(mem)) != 4) \
abort(); \
__arch_atomic_exchange_and_sub_32(mem, newval); \
})
#define atomic_decrement_if_positive(mem) \
({ \
if (sizeof(*(mem)) != 4) \
abort(); \
__arch_atomic_decrement_if_positive_32(mem); \
})
# define __arch_compare_and_exchange_bool_64_acq(mem, newval, oldval) \
(abort (), 0)
# define __arch_compare_and_exchange_val_64_acq(mem, newval, oldval) \
(abort (), (__typeof (*mem)) 0)
# define __arch_compare_and_exchange_bool_64_rel(mem, newval, oldval) \
(abort (), 0)
# define __arch_compare_and_exchange_val_64_rel(mem, newval, oldval) \
(abort (), (__typeof (*mem)) 0)
# define __arch_atomic_exchange_64_acq(mem, value) \
({ abort (); (*mem) = (value); })
# define __arch_atomic_exchange_64_rel(mem, value) \
({ abort (); (*mem) = (value); })
# define __arch_atomic_exchange_and_add_64(mem, value) \
({ abort (); (*mem) = (value); })
# define __arch_atomic_increment_val_64(mem) \
({ abort (); (*mem)++; })
# define __arch_atomic_decrement_val_64(mem) \
({ abort (); (*mem)--; })
# define __arch_atomic_decrement_if_positive_64(mem) \
({ abort (); (*mem)--; })
#endif /* _BITS_ATOMIC_H */
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