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| author | jeff <jeff@FreeBSD.org> | 2002-05-08 05:19:56 +0000 |
|---|---|---|
| committer | jeff <jeff@FreeBSD.org> | 2002-05-08 05:19:56 +0000 |
| commit | b7a3cfaaab3fd0bf3a27c08457ba479c92532130 (patch) | |
| tree | 360977ebdec5a6e0294170f2e0d3332ba994402f /sys/alpha/include | |
| parent | e35948a6eff30e777afcc61908c0a408ed551345 (diff) | |
| download | FreeBSD-src-b7a3cfaaab3fd0bf3a27c08457ba479c92532130.zip FreeBSD-src-b7a3cfaaab3fd0bf3a27c08457ba479c92532130.tar.gz | |
zapnot the signed bits in atomic_cmpset_32. Previously this did not work with
negative values because the original value was sign extended but the compared
value was not.
Diffstat (limited to 'sys/alpha/include')
| -rw-r--r-- | sys/alpha/include/atomic.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/alpha/include/atomic.h b/sys/alpha/include/atomic.h index 889b7e2..93cdbf6 100644 --- a/sys/alpha/include/atomic.h +++ b/sys/alpha/include/atomic.h @@ -356,6 +356,7 @@ atomic_cmpset_32(volatile u_int32_t* p, u_int32_t cmpval, u_int32_t newval) __asm __volatile ( "1:\tldl_l %0, %4\n\t" /* load old value */ + "zapnot %0,0xf,%0\n\t" /* Chop of signed bits */ "cmpeq %0, %2, %0\n\t" /* compare */ "beq %0, 2f\n\t" /* exit if not equal */ "mov %3, %0\n\t" /* value to store */ |
