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  2. Stack register - Wikipedia

    en.wikipedia.org/wiki/Stack_register

    The stack segment register (SS) is usually used to store information about the memory segment that stores the call stack of currently executed program. SP points to current stack top. By default, the stack grows downward in memory, so newer values are placed at lower memory addresses. To save a value to the stack, the PUSH instruction

  3. Program counter - Wikipedia

    en.wikipedia.org/wiki/Program_counter

    The instruction counter is at the lower left. The program counter ( PC ), [ 1 ] commonly called the instruction pointer ( IP ) in Intel x86 and Itanium microprocessors , and sometimes called the instruction address register ( IAR ), [ 2 ] [ 1 ] the instruction counter , [ 3 ] or just part of the instruction sequencer, [ 4 ] is a processor ...

  4. Comparison of instruction set architectures - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_instruction...

    8 (includes program counter and stack pointer, though any register can act as stack pointer) Variable (16-, 32-, or 48-bit) Condition code Little Extended Instruction Set, Floating Instruction Set, Floating Point Processor, Commercial Instruction Set No No POWER, PowerPC, Power ISA: 32/64 (32→64) 3.1 [30] 1990 3 (mostly). FMA, LD/ST-Update

  5. Thread control block - Wikipedia

    en.wikipedia.org/wiki/Thread_control_block

    Stack pointer: Points to thread's stack in the process; Program counter: Points to the current program instruction of the thread; State of the thread (running, ready, waiting, start, done) Thread's register values; Pointer to the Process control block (PCB) of the process that the thread lives on

  6. x86 memory segmentation - Wikipedia

    en.wikipedia.org/wiki/X86_memory_segmentation

    Since the base is set to 0 in all cases and the limit 4 GiB, the segmentation unit does not affect the addresses the program issues before they arrive at the paging unit. (This, of course, refers to 80386 and later processors, as the earlier x86 processors do not have a paging unit.) Current Linux also uses GS to point to thread-local storage.

  7. Stack-based memory allocation - Wikipedia

    en.wikipedia.org/wiki/Stack-based_memory_allocation

    A typical stack, storing local data and call information for nested procedure calls (not necessarily nested procedures). This stack grows downward from its origin. The stack pointer points to the current topmost datum on the stack. A push operation decrements the pointer and copies the data to the stack; a pop operation copies data from the ...

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