Trap Vector Linker Vector Register .GLOBAL .EXTERNAL Module Executable Image Unprivilledge Space O/S Space User mode System (Priviledge) mode Kernel PSR Priority Trap Vector Table Stack LIFO Queue FIFO Data structure Stack pointer Push Pop Interrupt vector Interrupt vector table RTI Interrupt service routine, Interrupt handler PSR Stack overflow Stack underflow Linked list Search Head Array Exception Stack calculator Double Linked Lists Stack Pointer Post-fix calculator Trap Service Routine System Service Call