protected boolean loadSections() {
	if (numPages > Machine.processor().getNumPhysPages()) {
	    coff.close();
	    Lib.debug(dbgProcess, "\tinsufficient physical memory");
	    return false;
	}

	// load sections
	for (int s=0; s<coff.getNumSections(); s++) {
	    CoffSection section = coff.getSection(s);

	    Lib.debug(dbgProcess, "\tinitializing " + section.getName()
		      + " section (" + section.getLength() + " pages)");

	    for (int i=0; i<section.getLength(); i++) {
		int vpn = section.getFirstVPN()+i;

		// for now, just assume virtual addresses=physical addresses
		section.loadPage(i, vpn);
	    }
	}

	return true;
    }

    /**
     * Release any resources allocated by <tt>loadSections()</tt>.
     */
    protected void unloadSections() {
    }

    /**
     * Initialize the processor's registers in preparation for running the
     * program loaded into this process. Set the PC register to point at the
     * start function, set the stack pointer register to point at the top of
     * the stack, set the A0 and A1 registers to argc and argv, respectively,
     * and initialize all other registers to 0.
     */
    public void initRegisters() {
	Processor processor = Machine.processor();

	// by default, everything's 0
	for (int i=0; i<processor.numUserRegisters; i++)
	    processor.writeRegister(i, 0);

	// initialize PC and SP according
	processor.writeRegister(Processor.regPC, initialPC);
	processor.writeRegister(Processor.regSP, initialSP);

	// initialize the first two argument registers to argc and argv
	processor.writeRegister(Processor.regA0, argc);
	processor.writeRegister(Processor.regA1, argv);
    }

    /**
     * Handle the halt() system call.
     */