The apparatuses, systems, and methods in accordance with the embodiments disclosed herein may facilitate modifying post silicon instruction behavior. Embodiments herein may provide registers in predetermined locations in an integrated circuit. These registers may be mapped to generic instructions, which can modify an operation of the integrated circuit. In some embodiments, these registers may be used to implement a patch routine to change the behavior of at least a portion of the integrated circuit. In this manner, the original design of the integrated circuit may be altered.