mirror of
git://git.musl-libc.org/musl
synced 2024-12-15 03:05:15 +00:00
4bb9b4f3b4
strictly speaking this and a few other ops should be factored into asm.h or the file should just be renamed to asm.h, but whatever. clean it up someday.
124 lines
2.7 KiB
C
124 lines
2.7 KiB
C
#ifndef _INTERNAL_ATOMIC_H
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#define _INTERNAL_ATOMIC_H
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#include <stdint.h>
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static inline int a_ctz_64(uint64_t x)
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{
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int r;
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__asm__( "bsf %1,%0 ; jnz 1f ; bsf %2,%0 ; addl $32,%0\n1:"
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: "=r"(r) : "r"((unsigned)x), "r"((unsigned)(x>>32)) );
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return r;
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}
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static inline int a_ctz_l(unsigned long x)
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{
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long r;
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__asm__( "bsf %1,%0" : "=r"(r) : "r"(x) );
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return r;
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}
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static inline void a_and_64(volatile uint64_t *p, uint64_t v)
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{
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__asm__( "lock ; andl %1, (%0) ; lock ; andl %2, 4(%0)"
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: : "r"((long *)p), "r"((unsigned)v), "r"((unsigned)(v>>32)) : "memory" );
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}
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static inline void a_or_64(volatile uint64_t *p, uint64_t v)
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{
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__asm__( "lock ; orl %1, (%0) ; lock ; orl %2, 4(%0)"
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: : "r"((long *)p), "r"((unsigned)v), "r"((unsigned)(v>>32)) : "memory" );
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}
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static inline void a_store_l(volatile void *p, long x)
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{
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__asm__( "movl %1, %0" : "=m"(*(long *)p) : "r"(x) : "memory" );
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}
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static inline void a_or_l(volatile void *p, long v)
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{
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__asm__( "lock ; orl %1, %0"
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: "=m"(*(long *)p) : "r"(v) : "memory" );
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}
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static inline void *a_cas_p(volatile void *p, void *t, void *s)
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{
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__asm__( "lock ; cmpxchg %3, %1"
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: "=a"(t), "=m"(*(long *)p) : "a"(t), "r"(s) : "memory" );
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return t;
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}
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static inline long a_cas_l(volatile void *p, long t, long s)
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{
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__asm__( "lock ; cmpxchg %3, %1"
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: "=a"(t), "=m"(*(long *)p) : "a"(t), "r"(s) : "memory" );
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return t;
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}
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static inline int a_cas(volatile int *p, int t, int s)
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{
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__asm__( "lock ; cmpxchg %3, %1"
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: "=a"(t), "=m"(*p) : "a"(t), "r"(s) : "memory" );
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return t;
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}
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static inline void *a_swap_p(void *volatile *x, void *v)
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{
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__asm__( "xchg %0, %1" : "=r"(v), "=m"(*(void **)x) : "0"(v) : "memory" );
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return v;
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}
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static inline long a_swap_l(volatile void *x, long v)
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{
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__asm__( "xchg %0, %1" : "=r"(v), "=m"(*(long *)x) : "0"(v) : "memory" );
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return v;
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}
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static inline void a_or(volatile void *p, int v)
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{
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__asm__( "lock ; orl %1, %0"
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: "=m"(*(int *)p) : "r"(v) : "memory" );
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}
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static inline void a_and(volatile void *p, int v)
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{
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__asm__( "lock ; andl %1, %0"
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: "=m"(*(int *)p) : "r"(v) : "memory" );
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}
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static inline int a_swap(volatile int *x, int v)
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{
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__asm__( "xchg %0, %1" : "=r"(v), "=m"(*x) : "0"(v) : "memory" );
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return v;
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}
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#define a_xchg a_swap
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static inline int a_fetch_add(volatile int *x, int v)
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{
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__asm__( "lock ; xadd %0, %1" : "=r"(v), "=m"(*x) : "0"(v) : "memory" );
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return v;
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}
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static inline void a_inc(volatile int *x)
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{
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__asm__( "lock ; incl %0" : "=m"(*x) : "m"(*x) : "memory" );
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}
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static inline void a_dec(volatile int *x)
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{
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__asm__( "lock ; decl %0" : "=m"(*x) : "m"(*x) : "memory" );
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}
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static inline void a_store(volatile int *p, int x)
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{
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__asm__( "movl %1, %0" : "=m"(*p) : "r"(x) : "memory" );
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}
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static inline void a_spin()
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{
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__asm__ __volatile__( "pause" : : : "memory" );
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}
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#endif
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