There are 8 special registers : program counter, interrupt stack pointer ISP, interrupt vector address register INTBASE, status register PSR, configuration register and 3 debug registers.
32.
The TMS34010 is a bit addressable, 32-bit processor, with two register files, each with fifteen general purpose registers and sharing a sixteenth stack pointer register.
33.
A stack is always a push-down list, meaning that as new requests come in, they push down the old ones related to the " Stack Pointer ".
34.
Behalf of the first 32 registers one register pair is defined as the program counter, another pair as the stack pointer, and one more pair as an index pointer for internal operations.
35.
The MV / 8000 was a straightforward, 32-bit extension of the Nova-based Eclipse, yet still lacking a hardware stack pointer adopted by most new computers since the late 1960s.
36.
Also, a 65C816 native mode operating system may well use a different stack location than the application software, which means the ISR would have to preserve and subsequently restore the stack pointer ( ).
37.
Thread switching is also relatively cheap : it requires a context switch ( saving and restoring registers and stack pointer ), but does not change virtual memory and is thus cache-friendly ( leaving TLB valid ).
38.
Depending again on the exact implementation, at the end of a push operation, the stack pointer may point to the next unused location in the stack, or it may point to the topmost item in the stack.
39.
A stack is usually represented in computers by a block of memory cells, with the " bottom " at a fixed location, and the stack pointer holding the address of the current " top " cell in the stack.
40.
According to the Oxford English Dictionary, the "'word " "'pointer " first appeared in print as a " stack pointer " in a technical memorandum by the System Development Corporation.
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