diff --git a/libc/private/bionic_vdso.h b/libc/private/bionic_vdso.h
new file mode 100644
index 0000000..5400de5
--- /dev/null
+++ b/libc/private/bionic_vdso.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _PRIVATE_BIONIC_VDSO_H
+#define _PRIVATE_BIONIC_VDSO_H
+
+#include <time.h>
+
+#if defined(__aarch64__)
+#define VDSO_CLOCK_GETTIME_SYMBOL "__kernel_clock_gettime"
+#define VDSO_GETTIMEOFDAY_SYMBOL  "__kernel_gettimeofday"
+#elif defined(__x86_64__) || defined(__i386__)
+#define VDSO_CLOCK_GETTIME_SYMBOL "__vdso_clock_gettime"
+#define VDSO_GETTIMEOFDAY_SYMBOL  "__vdso_gettimeofday"
+#endif
+
+extern "C" int __clock_gettime(int, timespec*);
+extern "C" int __gettimeofday(timeval*, struct timezone*);
+
+struct vdso_entry {
+  const char* name;
+  void* fn;
+};
+
+enum {
+  VDSO_CLOCK_GETTIME = 0,
+  VDSO_GETTIMEOFDAY,
+  VDSO_END
+};
+
+#endif  // _PRIVATE_BIONIC_VDSO_H