stack pointer การใช้

• There is no concept of a stack and no stack pointer register.
• R6 was the stack pointer, R7 the program counter.
• The stack pointer ( SP ) can be watched.
• It has three other registers that are used by some instructions as stack pointers.
• An advantage of this system is that the supervisor level has a separate stack pointer.
• This also allows FSR to be treated almost like a stack pointer ( SP ).
• Similarly, the current stack pointer and / or frame pointer values may be pushed.
• These registers generally contain the stack pointer and the return address from function calls, respectively.
• This also resides in the TSS and contains logical ( segment + offset ) stack pointers.
• Space on the stack for local variables can then be allocated by incrementally changing the stack pointer.
• The value of the stack pointer can be checked at the start of the interrupt service routine.
• The stack is implemented with an implicitly decrementing ( push ) and incrementing ( pop ) stack pointer.
• The location of the frame pointer itself must inherently be defined as a negative offset of the stack pointer.
• For example, it was necessary, for operating system integrity, that the stack pointer register never be odd.
• Actually the list is fixed and it is the stack pointer that moves, up in save operation, down in restore operation.
• The result was released in 1969 as the HP 1000; compilers used hardware-based memory locations in lieu of a stack pointer.
• If frame pointers are being used, the prologue will typically set the new value of the frame pointer register from the stack pointer.
• A domain was the equivalent of a Unix process without a stack pointer ( each thread in a domain had a stack pointer ).
• A domain was the equivalent of a Unix process without a stack pointer ( each thread in a domain had a stack pointer ).
• The topmost item in the stack is removed and the stack pointer is updated, in the opposite order of that used in the push operation.