/**
     * The exception handler. This handler is called by the processor whenever
     * a user instruction causes a processor exception.
     *
     * <p>
     * When the exception handler is invoked, interrupts are enabled, and the
     * processor's cause register contains an integer identifying the cause of
     * the exception (see the <tt>exceptionZZZ</tt> constants in the
     * <tt>Processor</tt> class). If the exception involves a bad virtual
     * address (e.g. page fault, TLB miss, read-only, bus error, or address
     * error), the processor's BadVAddr register identifies the virtual address
     * that caused the exception.
     */
    public void exceptionHandler() {
	Lib.assert(KThread.currentThread() instanceof UThread);

	UserProcess process = ((UThread) KThread.currentThread()).process;
	int cause = Machine.processor().readRegister(Processor.regCause);
	process.handleException(cause);
    }
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  /**
   * Handle a user exception. Called by <tt>UserKernel.exceptionHandler()</tt> . The <i>cause</i>
   * argument identifies which exception occurred; see the <tt>Processor.exceptionZZZ</tt>
   * constants.
   *
   * @param cause the user exception that occurred.
   */
  public void handleException(int cause) {
    Processor processor = Machine.processor();

    switch (cause) {
      case Processor.exceptionTLBMiss:
        handleTLBMiss();
        break;
      default:
        super.handleException(cause);
        break;
    }
  }