x86 汇编中寄存器上使用的 push/pop 指令的功能是什么? [英] What is the function of the push / pop instructions used on registers in x86 assembly?

问题描述

在阅读有关汇编程序的文章时，我经常遇到有人写道，他们推送处理器的某个寄存器，然后再次弹出以恢复它以前的状态.

When reading about assembler I often come across people writing that they push a certain register of the processor and pop it again later to restore it's previous state.

• 如何推送寄存器?它被推到哪里去了?为什么需要这样做?
• 这归结为单个处理器指令还是更复杂?

推荐答案

推送一个值(不一定存储在寄存器中)意味着将它写入堆栈.

pushing a value (not necessarily stored in a register) means writing it to the stack.

弹出意味着将堆栈顶部的任何内容恢复到寄存器中.这些是基本说明:

popping means restoring whatever is on top of the stack into a register. Those are basic instructions:

push 0xdeadbeef      ; push a value to the stack
pop eax              ; eax is now 0xdeadbeef

; swap contents of registers
push eax
mov eax, ebx
pop ebx

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