什么是pushl / popl等ESP％的组件级表示？(What is an assembly-le

C ++

ATT大会

我想了解以下两个指令的行为：

pushl %esp

和：

popl %esp

需要注意的是它们存储的计算值回%esp 。

我独立考虑这些说明，没有先后顺序。 我知道，存储在值%esp总是递增/递减前的价值，但我怎么能代表汇编语言的行为？ 这是我想出迄今：

对于推：

movl %esp, %edx     1. save value of %esp
subl  $4, %esp      2. decrement stack pointer
movl %edx, (%esp)   3. store old value of %esp on top of stack

对于流行：

movl (%esp), %esp   You wouldn’t need the increment portion. 

它是否正确？ 如果不是这样，我要去哪里错了？ 谢谢。

Answer 1:

因为它说，大约push esp在英特尔®64和IA-32架构开发人员手册：综合卷 ：

The PUSH ESP instruction pushes the value of the ESP register as it existed
before the instruction was executed. If a PUSH instruction uses a memory operand
in which the ESP register is used for computing the operand address, the address
of the operand is computed before the ESP register is decremented.

而至于到pop esp ：

The POP ESP instruction increments the stack pointer (ESP) before data at the old
top of stack is written into the destination.

文章来源: What is an assembly-level representation of pushl/popl %esp?