Finally, the store instruction 310 of FIG. 3C, like the store instruction 304 of FIG. 3B, comprises a conventional opcode 312. The store instruction 310, though, also comprises a custom operand 314 that indicates to the processor device 102 that the store instruction 310 is stack-panic-fault-enabled. Thus, the processor device 102 may determine that an exception arising from execution of the store instruction 310 should be handled as a stack panic fault exception based on determining that the store instruction 310 comprises the custom operand 314.