[MIPS] Add seccomp bpf support

sandbox/linux/seccomp-bpf/kernel_return_value_helpers_unittest.cc

Index: sandbox/linux/seccomp-bpf/kernel_return_value_helpers_unittest.cc
diff --git a/sandbox/linux/seccomp-bpf/kernel_return_value_helpers_unittest.cc b/sandbox/linux/seccomp-bpf/kernel_return_value_helpers_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6f800a5a361970d28ee0ef5440760434d307f79b
--- /dev/null
+++ b/sandbox/linux/seccomp-bpf/kernel_return_value_helpers_unittest.cc
@@ -0,0 +1,34 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+
+#include <errno.h>
+#include <asm/unistd.h>
+
+#include "sandbox/linux/seccomp-bpf/bpf_tests.h"
+#include "sandbox/linux/seccomp-bpf/kernel_return_value_helpers.h"
+#include "sandbox/linux/seccomp-bpf/syscall.h"
+#include "sandbox/linux/tests/unit_tests.h"
+
+namespace sandbox {
+
+namespace {
+
+// Check that ErrnoToKernelRet works.
+TEST(KernelReturnValueHelpers, ErrnoToKernelRet) {
+#if defined(__mips__)
+  int err_status, test_val = -1;
+  const intptr_t* arg_val = &test_val;
+  int expected_kernel_ret = SandboxSyscallRaw(__NR_dup, arg_val, &err_status);
+  // On error, syscall returns non zero value as error status on MIPS.
+  ASSERT_NE(err_status, 0);
+#else
+  int expected_kernel_ret = SandboxSyscall(__NR_dup, -1);
+#endif  // defined(__mips__)
+
+  ASSERT_EQ(expected_kernel_ret, ErrnoToKernelRet(EBADF));
+}
+
+}
+} // namespace sandbox