diff --git a/util/m5/src/jni/gem5Op.java b/util/m5/src/jni/gem5Op.java
index 11403bfbbd..968c4a24ad 100644
--- a/util/m5/src/jni/gem5Op.java
+++ b/util/m5/src/jni/gem5Op.java
@@ -52,6 +52,7 @@ public class gem5Op {
 
     public native void exit(long ns_delay);
     public native void fail(long ns_delay, long code);
+    public native long sum(long a, long b, long c, long d, long e, long f);
     public native long init_param(long key_str1, long key_str2);
     public native void checkpoint(long ns_delay, long ns_period);
     public native void reset_stats(long ns_delay, long ns_period);
diff --git a/util/m5/src/jni_gem5Op.c b/util/m5/src/jni_gem5Op.c
index 83a9512e22..fe8d41d9b3 100644
--- a/util/m5/src/jni_gem5Op.c
+++ b/util/m5/src/jni_gem5Op.c
@@ -104,6 +104,16 @@ Java_jni_gem5Op_fail(JNIEnv *env, jobject obj, jlong j_ns_delay, jlong j_code)
     m5_fail(j_ns_delay, j_code);
 }
 
+JNIEXPORT jlong JNICALL
+Java_jni_gem5Op_sum(JNIEnv *env, jobject obj, jlong a, jlong b, jlong c,
+                    jlong d, jlong e, jlong f)
+{
+    uint64_t result = m5_sum(a, b, c, d, e, f);
+    if (result & 0x8000000000000000ULL)
+        printf("Truncated return value from sum() to 63 bits\n");
+    return (result & 0x7FFFFFFFFFFFFFFFULL);
+}
+
 JNIEXPORT jlong JNICALL
 Java_jni_gem5Op_init_1param(JNIEnv *env, jobject obj, jlong j_key_str1,
                            jlong j_key_str2)
diff --git a/util/m5/src/lua_gem5Op.cc b/util/m5/src/lua_gem5Op.cc
index 3c8b20454b..e4d1d76f8d 100644
--- a/util/m5/src/lua_gem5Op.cc
+++ b/util/m5/src/lua_gem5Op.cc
@@ -100,6 +100,20 @@ do_exit(lua_State *L)
     return 0;
 }
 
+static int
+do_sum(lua_State *L)
+{
+    uint64_t a = lua_tointeger(L, 1);
+    uint64_t b = lua_tointeger(L, 2);
+    uint64_t c = lua_tointeger(L, 3);
+    uint64_t d = lua_tointeger(L, 4);
+    uint64_t e = lua_tointeger(L, 5);
+    uint64_t f = lua_tointeger(L, 6);
+    uint64_t sum = m5_sum(a, b, c, d, e, f);
+    lua_pushinteger(L, sum);
+    return 1;
+}
+
 static int
 do_fail(lua_State *L)
 {