linux/arch/sparc/include/uapi/asm/swab.h
David S. Miller 5a2b59d399 sparc64: Fix constraints on swab helpers.
We are reading the memory location, so we have to have a memory
constraint in there purely for the sake of showing the data flow
to the compiler.

Reported-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-16 13:19:32 -08:00

46 lines
971 B
C

#ifndef _SPARC_SWAB_H
#define _SPARC_SWAB_H
#include <linux/types.h>
#include <asm/asi.h>
#if defined(__sparc__) && defined(__arch64__)
static inline __u16 __arch_swab16p(const __u16 *addr)
{
__u16 ret;
__asm__ __volatile__ ("lduha [%2] %3, %0"
: "=r" (ret)
: "m" (*addr), "r" (addr), "i" (ASI_PL));
return ret;
}
#define __arch_swab16p __arch_swab16p
static inline __u32 __arch_swab32p(const __u32 *addr)
{
__u32 ret;
__asm__ __volatile__ ("lduwa [%2] %3, %0"
: "=r" (ret)
: "m" (*addr), "r" (addr), "i" (ASI_PL));
return ret;
}
#define __arch_swab32p __arch_swab32p
static inline __u64 __arch_swab64p(const __u64 *addr)
{
__u64 ret;
__asm__ __volatile__ ("ldxa [%2] %3, %0"
: "=r" (ret)
: "m" (*addr), "r" (addr), "i" (ASI_PL));
return ret;
}
#define __arch_swab64p __arch_swab64p
#else
#define __SWAB_64_THRU_32__
#endif /* defined(__sparc__) && defined(__arch64__) */
#endif /* _SPARC_SWAB_H */