/**
* 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.exceptionSyscall:
int result =
handleSyscall(
processor.readRegister(Processor.regV0),
processor.readRegister(Processor.regA0),
processor.readRegister(Processor.regA1),
processor.readRegister(Processor.regA2),
processor.readRegister(Processor.regA3));
processor.writeRegister(Processor.regV0, result);
processor.advancePC();
break;
default:
Lib.debug(dbgProcess, "Unexpected exception: " + Processor.exceptionNames[cause]);
handleExit(-1);
Lib.assertNotReached("Unexpected exception");
}
}
