protected boolean loadSections() {

    	UserKernel.availablePageLock.acquire();
		if (numPages > UserKernel.availablePages.size()) {
		    coff.close();
		    Lib.debug(dbgProcess, "\tinsufficient physical memory");
		    UserKernel.availablePageLock.release();
		    return false;
		}
		pageTable = new TranslationEntry[numPages];
		for (int i=0; i< numPages; i++)
    	    pageTable[i] = new TranslationEntry(i,UserKernel.availablePages.remove(), true,false,false,false);
		UserKernel.availablePageLock.release();
		// 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;

			//int ppn = UserKernel.availablePages.remove().ppn;
			pageTable[vpn].readOnly = section.isReadOnly();

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

		return true;
    }