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authorRich Felker <dalias@aerifal.cx>2012-11-14 14:24:22 -0500
committerRich Felker <dalias@aerifal.cx>2012-11-14 14:24:22 -0500
commite7257d3e63b10d4725450c383e94cdbb997d9151 (patch)
tree34753864f964804b24bab36c94f4430d7bff9996 /arch/powerpc
parent574d01a69617921b72d0171f9a0d6cd414619220 (diff)
downloadmusl-e7257d3e63b10d4725450c383e94cdbb997d9151.tar.gz
fix powerpc atomic compare-and-swap function
previous version did not compare at all; it was just a fancy atomic write. untested. further atomic fixes may be needed.
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/atomic.h13
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/powerpc/atomic.h b/arch/powerpc/atomic.h
index a83764d9..4a47064a 100644
--- a/arch/powerpc/atomic.h
+++ b/arch/powerpc/atomic.h
@@ -25,12 +25,13 @@ static inline int a_ctz_64(uint64_t x)
static inline int a_cas(volatile int *p, int t, int s)
{
-
- __asm__( "1: lwarx 10, 0, %1\n"
- " stwcx. %3, 0, %1\n"
- " bne- 1b\n"
- " mr %0, 10\n"
- : "=r"(t) : "r"(p), "r"(t), "r"(s) : "memory" );
+ __asm__("1: lwarx %0, 0, %1\n"
+ " cmpw %0, %2\n"
+ " bne 1f\n"
+ " stwcx. %3, 0, %1\n"
+ " bne- 1b\n"
+ "1: \n"
+ : "=&r"(t) : "r"(p), "r"(t), "r"(s) : "cc", "memory" );
return t;
}