1 files changed, 33 insertions, 0 deletions
diff --git a/pkg/sync/race_amd64.s b/pkg/sync/race_amd64.s
new file mode 100644
index 000000000..57bc0ec79
--- /dev/null
+++ b/pkg/sync/race_amd64.s
@@ -0,0 +1,33 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build race
+// +build amd64
+
+#include "textflag.h"
+
+// func RaceUncheckedAtomicCompareAndSwapUintptr(ptr *uintptr, old, new uintptr) bool
+TEXT ·RaceUncheckedAtomicCompareAndSwapUintptr(SB),NOSPLIT,$0-25
+	MOVQ ptr+0(FP), DI
+	MOVQ old+8(FP), AX
+	MOVQ new+16(FP), SI
+
+	LOCK
+	CMPXCHGQ SI, 0(DI)
+
+	SETEQ AX
+	MOVB AX, ret+24(FP)
+
+	RET
+