Can I Go Back To Philippines Even In Expired Passport? Im Here In Saudi Arabia?

My Passport is already expired aug. 2012, My contract will be finished on Feb 2013, My question is can i still travel in Philippines with expired passport or do i need to renew it here? And what will be the penalty in expired passport.
I cannot go to embassy coz i always travel by land.
Please guide me through here..
Thank you All!!!