mirror of git://git.musl-libc.org/musl
169 lines
3.5 KiB
C
169 lines
3.5 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_l(unsigned long x)
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{
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static const char debruijn32[32] = {
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0, 1, 23, 2, 29, 24, 19, 3, 30, 27, 25, 11, 20, 8, 4, 13,
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31, 22, 28, 18, 26, 10, 7, 12, 21, 17, 9, 6, 16, 5, 15, 14
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};
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return debruijn32[(x&-x)*0x076be629 >> 27];
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}
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static inline int a_ctz_64(uint64_t x)
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{
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uint32_t y = x;
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if (!y) {
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y = x>>32;
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return 32 + a_ctz_l(y);
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}
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return a_ctz_l(y);
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}
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#define LLSC_CLOBBERS "r0", "t", "memory"
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#define LLSC_START(mem) "synco\n" \
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"0: movli.l @" mem ", r0\n"
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#define LLSC_END(mem) \
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"1: movco.l r0, @" mem "\n" \
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" bf 0b\n" \
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" synco\n"
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static inline int __sh_cas_llsc(volatile int *p, int t, int s)
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{
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int old;
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__asm__ __volatile__(
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LLSC_START("%1")
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" mov r0, %0\n"
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" cmp/eq %0, %2\n"
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" bf 1f\n"
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" mov %3, r0\n"
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LLSC_END("%1")
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: "=&r"(old) : "r"(p), "r"(t), "r"(s) : LLSC_CLOBBERS);
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return old;
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}
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static inline int __sh_swap_llsc(volatile int *x, int v)
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{
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int old;
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__asm__ __volatile__(
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LLSC_START("%1")
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" mov r0, %0\n"
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" mov %2, r0\n"
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LLSC_END("%1")
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: "=&r"(old) : "r"(x), "r"(v) : LLSC_CLOBBERS);
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return old;
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}
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static inline int __sh_fetch_add_llsc(volatile int *x, int v)
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{
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int old;
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__asm__ __volatile__(
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LLSC_START("%1")
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" mov r0, %0\n"
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" add %2, r0\n"
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LLSC_END("%1")
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: "=&r"(old) : "r"(x), "r"(v) : LLSC_CLOBBERS);
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return old;
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}
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static inline void __sh_store_llsc(volatile int *p, int x)
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{
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__asm__ __volatile__(
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" synco\n"
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" mov.l %1, @%0\n"
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" synco\n"
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: : "r"(p), "r"(x) : "memory");
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}
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static inline void __sh_and_llsc(volatile int *x, int v)
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{
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__asm__ __volatile__(
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LLSC_START("%0")
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" and %1, r0\n"
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LLSC_END("%0")
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: : "r"(x), "r"(v) : LLSC_CLOBBERS);
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}
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static inline void __sh_or_llsc(volatile int *x, int v)
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{
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__asm__ __volatile__(
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LLSC_START("%0")
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" or %1, r0\n"
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LLSC_END("%0")
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: : "r"(x), "r"(v) : LLSC_CLOBBERS);
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}
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#ifdef __SH4A__
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#define a_cas(p,t,s) __sh_cas_llsc(p,t,s)
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#define a_swap(x,v) __sh_swap_llsc(x,v)
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#define a_fetch_add(x,v) __sh_fetch_add_llsc(x, v)
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#define a_store(x,v) __sh_store_llsc(x, v)
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#define a_and(x,v) __sh_and_llsc(x, v)
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#define a_or(x,v) __sh_or_llsc(x, v)
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#else
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int __sh_cas(volatile int *, int, int);
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int __sh_swap(volatile int *, int);
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int __sh_fetch_add(volatile int *, int);
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void __sh_store(volatile int *, int);
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void __sh_and(volatile int *, int);
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void __sh_or(volatile int *, int);
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#define a_cas(p,t,s) __sh_cas(p,t,s)
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#define a_swap(x,v) __sh_swap(x,v)
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#define a_fetch_add(x,v) __sh_fetch_add(x, v)
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#define a_store(x,v) __sh_store(x, v)
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#define a_and(x,v) __sh_and(x, v)
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#define a_or(x,v) __sh_or(x, v)
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#endif
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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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return (void *)a_cas(p, (int)t, (int)s);
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}
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static inline void a_inc(volatile int *x)
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{
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a_fetch_add(x, 1);
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}
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static inline void a_dec(volatile int *x)
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{
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a_fetch_add(x, -1);
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}
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#define a_spin a_barrier
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static inline void a_barrier()
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{
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a_cas(&(int){0}, 0, 0);
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}
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static inline void a_crash()
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{
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*(volatile char *)0=0;
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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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a_or(p, v);
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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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union { uint64_t v; uint32_t r[2]; } u = { v };
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a_and((int *)p, u.r[0]);
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a_and((int *)p+1, u.r[1]);
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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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union { uint64_t v; uint32_t r[2]; } u = { v };
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a_or((int *)p, u.r[0]);
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a_or((int *)p+1, u.r[1]);
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}
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#endif
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