public static void raiseException(int which, int badVAddr) {
Debug.println('m', "Exception: " + exceptionNames[which]);
Debug.ASSERT(Interrupt.getStatus() == Interrupt.UserMode);
registers[BadVAddrReg] = badVAddr;
delayedLoad(0, 0); // finish anything in progress
Interrupt.setStatus(Interrupt.SystemMode);
Nachos.exceptionHandler(which); // interrupts are enabled at this point
Interrupt.setStatus(Interrupt.UserMode);
}
public static void run() {
Instruction instr = new Instruction(); // storage for decoded instruction
Debug.println('m', "Starting user thread " +
Thread.currentThread().getName() +
"at time " + Nachos.stats.totalTicks);
Interrupt.setStatus(Interrupt.UserMode);
for (;;) {
oneInstruction(instr);
Interrupt.oneTick();
if (singleStep && (runUntilTime <= Nachos.stats.totalTicks))
debugger();
}
}
public static void debugger() {
//Debug.println('m', "Debugger not implemented");
int num;
char inputChar; // char read from input stream
Interrupt.dumpState();
dumpState();
System.out.print(Nachos.stats.totalTicks + "> ");
System.out.flush();
// get user input, character at a time.
try {
inputChar = (char)(System.in.read());
} catch (IOException _) {
inputChar = 'x';
}
if (inputChar == 'c')
singleStep = false;
else if (inputChar == '?') {
System.out.println("Machine commands:");
System.out.println(" <return> execute one instruction");
System.out.println(" <number> run until the given timer tick");
System.out.println(" c run until completion");
System.out.println(" ? print this help message");
}
else if (Character.isDigit(inputChar)) {
int tempNum = 0;
while (Character.isDigit(inputChar)) {
tempNum *= 10;
tempNum += Character.digit(inputChar, 10);
try {
inputChar = (char)(System.in.read());
} catch (IOException _) {
inputChar = 'x';
break;
}
runUntilTime = tempNum;
}
}
}