组装-修改堆栈内容

Question

How do I modify stack memory chunk in assembly? 如何在程序集中修改堆栈内存块？

I thought of one way, which is: 我想到了一种方法，即：

POP EAX
ADD EAX, 5
PUSH EAX

Is there a shorter more efficient way of doing this? 是否有更短的更有效的方法？

Answer 1

You can address the value on the stack directly with a memory operand, as in 您可以使用内存操作数直接在堆栈上寻址值，如下所示：

add dword [esp], 5

or 要么

add qword [rsp], 5

if you are targeting 64 bit; 如果您的目标是64位； in 16 bit mode, instead, sp -based addressing is not available . 在16位模式下，基于sp的寻址不可用。