solution

 

Write a divide error exception handler to replace the system-supplied one. This handler should display the message, “A divide error has occurred” and then replace the result with the maximum possible value. You can use registers for the dividend and divisor of the div instruction. Test your divide error interrupt handler by making the divisor zero. Also, experiment with the interrupt handler code so that you can verify that the div instruction is restarted because divide error is considered a fault. For example, if your interrupt handler does not change the value of the divisor (i.e., leave it as 0), your program will not terminate, as it repeatedly calls the divide error exception handler by restarting the divide instruction. After observing this behavior, modify the interrupt handler to change the divisor to a value other than 0 in order to proceed with your test program.