@Override
	public boolean unknownAddress(Address address, boolean write) {
		if (faultHandler != null) {
			return faultHandler.unknownAddress(address, write);
		}
		Address pc = emulator.getExecuteAddress();
		String access = write ? "written" : "read";
		Msg.warn(this, "Unknown address " + access + " at " + pc + ": " + address);
		return false;
	}
@return address set of memory locations written by the emulator if memory write tracking is
        enabled, otherwise null is returned. The address set returned will continue to be
        updated unless memory write tracking becomes disabled.
Ghidra/Framework/Emulation/src/main/java/ghidra/app/emulator/EmulatorHelper.java