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| author | David S. Miller <davem@sunset.davemloft.net> | 2006-03-28 01:00:08 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-28 01:00:08 -0800 |
| commit | 6e57a3a89785692bd8d012d80f5ee210ab8e0b68 (patch) | |
| tree | d55008a8c891193b1858487e1177a44f6add06fd | |
| parent | 329b10bb0feacb7fb9a41389313ff0a51ae56f2a (diff) | |
| download | lwn-6e57a3a89785692bd8d012d80f5ee210ab8e0b68.tar.gz lwn-6e57a3a89785692bd8d012d80f5ee210ab8e0b68.zip | |
[SPARC64]: Implement futex_atomic_cmpxchg_inatomic().
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/asm-sparc64/futex.h | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h index cd340a233156..dee40206b221 100644 --- a/include/asm-sparc64/futex.h +++ b/include/asm-sparc64/futex.h @@ -84,9 +84,27 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) } 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) */ |