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diff --git a/libseccomp/tests/12-sim-basic_masked_ops.py b/libseccomp/tests/12-sim-basic_masked_ops.py
new file mode 100755
index 0000000..48cf63a
--- /dev/null
+++ b/libseccomp/tests/12-sim-basic_masked_ops.py
@@ -0,0 +1,61 @@
+#!/usr/bin/env python
+
+#
+# Seccomp Library test program
+#
+# Copyright (c) 2012 Red Hat <pmoore@redhat.com>
+# Author: Paul Moore <paul@paul-moore.com>
+#
+
+#
+# This library is free software; you can redistribute it and/or modify it
+# under the terms of version 2.1 of the GNU Lesser General Public License as
+# published by the Free Software Foundation.
+#
+# This library is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+# for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with this library; if not, see <http://www.gnu.org/licenses>.
+#
+
+import argparse
+import sys
+
+import util
+
+from seccomp import *
+
+def test(args):
+    f = SyscallFilter(KILL)
+    # the syscall and argument numbers are all fake to make the test simpler
+    f.add_rule_exactly(ALLOW, 1000,
+                       Arg(0, EQ, 0),
+                       Arg(1, EQ, 1),
+                       Arg(2, EQ, 2))
+    f.add_rule_exactly(ALLOW, 1000,
+                       Arg(0, EQ, 0),
+                       Arg(1, MASKED_EQ, 0x00ff, 1),
+                       Arg(2, EQ, 2))
+    f.add_rule_exactly(ALLOW, 1000,
+                       Arg(0, EQ, 0),
+                       Arg(1, MASKED_EQ, 0xffff, 11),
+                       Arg(2, EQ, 2))
+    f.add_rule_exactly(ALLOW, 1000,
+                       Arg(0, EQ, 0),
+                       Arg(1, MASKED_EQ, 0xffff, 111),
+                       Arg(2, EQ, 2))
+    f.add_rule_exactly(ALLOW, 1000,
+                       Arg(0, EQ, 0),
+                       Arg(1, MASKED_EQ, 0xff00, 1000),
+                       Arg(2, EQ, 2))
+    return f
+
+args = util.get_opt()
+ctx = test(args)
+util.filter_output(args, ctx)
+
+# kate: syntax python;
+# kate: indent-mode python; space-indent on; indent-width 4; mixedindent off;