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| author | Jeff Garzik <jeff@garzik.org> | 2006-03-29 17:18:49 -0500 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2006-03-29 17:18:49 -0500 |
| commit | e02a4cabfcb9a999b74a2e2e6f13ffcb7ff2d606 (patch) | |
| tree | 2f3db60be4c57eca2a4c3ab3f3122dcf1ec0c624 /include/asm-sparc64/futex.h | |
| parent | 600511e86babe3727264a0883a3a264f6fb6caf5 (diff) | |
| parent | f3cab8a0b1a772dc8b055b7affa567a366627c9e (diff) | |
Merge branch 'master'
Diffstat (limited to 'include/asm-sparc64/futex.h')
| -rw-r--r-- | include/asm-sparc64/futex.h | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/include/asm-sparc64/futex.h b/include/asm-sparc64/futex.h index 34c4b43d3f9..dee40206b22 100644 --- a/include/asm-sparc64/futex.h +++ b/include/asm-sparc64/futex.h @@ -83,4 +83,28 @@ static inline int futex_atomic_op_inuser(int encoded_op, int __user *uaddr) return ret; } +static inline int +futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval) +{ + __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) */ |