PC update 4. All instructions are available. If interrupts are disabled, then the hardware is not checking to see if there are further interrupts to handle. Disabling makes sure that the handling of an interrupt is not interrupted. 4. saves current PC coprocessor C0, register 14, called Exception Program counter.
Gives return address within user program.
Where to return to when done handling the exception. This is where the exception handler code is. Then, the code within the exception handler is run. Figure out exception type. In most minds, when people think of a kernel, they think of critical portions of an operating system.