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[SPARC64]: Implement futex_atomic_cmpxchg_inatomic().

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Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-03-28 01:00:08 -08:00
parent 329b10bb0f
commit 6e57a3a897
1 changed files with 20 additions and 2 deletions
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22
include/asm-sparc64/futex.h
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@ -84,9 +84,27 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr)
} }
static inline int static inline int
futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval) futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
{ {
return -ENOSYS; __asm__ __volatile__(
"\n1: lduwa [%2] %%asi, %0\n"
"2: casa [%2] %%asi, %0, %1\n"
"3:\n"
" .section .fixup,#alloc,#execinstr\n"
" .align 4\n"
"4: ba 3b\n"
" mov %3, %0\n"
" .previous\n"
" .section __ex_table,\"a\"\n"
" .align 4\n"
" .word 1b, 4b\n"
" .word 2b, 4b\n"
" .previous\n"
: "=&r" (oldval)
: "r" (newval), "r" (uaddr), "i" (-EFAULT)
: "memory");
return oldval;
} }
#endif /* !(_SPARC64_FUTEX_H) */ #endif /* !(_SPARC64_FUTEX_H) */