From 6e57a3a89785692bd8d012d80f5ee210ab8e0b68 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@sunset.davemloft.net>
Date: Tue, 28 Mar 2006 01:00:08 -0800
Subject: [SPARC64]: Implement futex_atomic_cmpxchg_inatomic().
Signed-off-by: David S. Miller <davem@davemloft.net>
---
include/asm-sparc64/futex.h | 22 ++++++++++++++++++++--
1 file 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) */
--
cgit v1.2.3-70-g09d2