/* sim5.c - add push, pop, call, ret to sim4                                */
/* Last modified on June 29, 2012                                           */
/* usage "sim5 < test.sim5" up to 100 cycles with trace                     */
/* usage "sim5 1000 < test.sim5" up to 1000 cycles with trace               */
/* usage "sim5 1000 800 900 < test.sim5" up to 1000 cycles trace 800 to 900 */
/* usage "sim5 1000 0 0 < test.sim5" up to 1000 cycles with no trace        */
 
/* You get to write the rest of the code                                    */