diff options
Diffstat (limited to 'libc-top-half/musl/arch/i386/atomic_arch.h')
-rw-r--r-- | libc-top-half/musl/arch/i386/atomic_arch.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/libc-top-half/musl/arch/i386/atomic_arch.h b/libc-top-half/musl/arch/i386/atomic_arch.h new file mode 100644 index 0000000..047fb68 --- /dev/null +++ b/libc-top-half/musl/arch/i386/atomic_arch.h @@ -0,0 +1,108 @@ +#define a_cas a_cas +static inline int a_cas(volatile int *p, int t, int s) +{ + __asm__ __volatile__ ( + "lock ; cmpxchg %3, %1" + : "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" ); + return t; +} + +#define a_swap a_swap +static inline int a_swap(volatile int *p, int v) +{ + __asm__ __volatile__( + "xchg %0, %1" + : "=r"(v), "=m"(*p) : "0"(v) : "memory" ); + return v; +} + +#define a_fetch_add a_fetch_add +static inline int a_fetch_add(volatile int *p, int v) +{ + __asm__ __volatile__( + "lock ; xadd %0, %1" + : "=r"(v), "=m"(*p) : "0"(v) : "memory" ); + return v; +} + +#define a_and a_and +static inline void a_and(volatile int *p, int v) +{ + __asm__ __volatile__( + "lock ; and %1, %0" + : "=m"(*p) : "r"(v) : "memory" ); +} + +#define a_or a_or +static inline void a_or(volatile int *p, int v) +{ + __asm__ __volatile__( + "lock ; or %1, %0" + : "=m"(*p) : "r"(v) : "memory" ); +} + +#define a_inc a_inc +static inline void a_inc(volatile int *p) +{ + __asm__ __volatile__( + "lock ; incl %0" + : "=m"(*p) : "m"(*p) : "memory" ); +} + +#define a_dec a_dec +static inline void a_dec(volatile int *p) +{ + __asm__ __volatile__( + "lock ; decl %0" + : "=m"(*p) : "m"(*p) : "memory" ); +} + +#define a_store a_store +static inline void a_store(volatile int *p, int x) +{ + __asm__ __volatile__( + "mov %1, %0 ; lock ; orl $0,(%%esp)" + : "=m"(*p) : "r"(x) : "memory" ); +} + +#define a_barrier a_barrier +static inline void a_barrier() +{ + __asm__ __volatile__( "" : : : "memory" ); +} + +#define a_spin a_spin +static inline void a_spin() +{ + __asm__ __volatile__( "pause" : : : "memory" ); +} + +#define a_crash a_crash +static inline void a_crash() +{ + __asm__ __volatile__( "hlt" : : : "memory" ); +} + +#define a_ctz_64 a_ctz_64 +static inline int a_ctz_64(uint64_t x) +{ + int r; + __asm__( "bsf %1,%0 ; jnz 1f ; bsf %2,%0 ; add $32,%0\n1:" + : "=&r"(r) : "r"((unsigned)x), "r"((unsigned)(x>>32)) ); + return r; +} + +#define a_ctz_32 a_ctz_32 +static inline int a_ctz_32(uint32_t x) +{ + int r; + __asm__( "bsf %1,%0" : "=r"(r) : "r"(x) ); + return r; +} + +#define a_clz_32 a_clz_32 +static inline int a_clz_32(uint32_t x) +{ + __asm__( "bsr %1,%0 ; xor $31,%0" : "=r"(x) : "r"(x) ); + return x; +} |