probe process.function("foo").return {
    printf("x2 = %#x\n", register("x2"));
    printf("u x2 = %#x\n\n", u_register("x2"));

    printf("w2 = %#x\n", register("w2"));
    printf("u w2 = %#x\n", u_register("w2"));
    exit()
}
