x86 Assembly Memory-“添加"功能是什么?指令吗? [英] x86 Assembly Memory - What does the "add" instruction do?

问题描述

下面的内存段.

在第一个添加指令(添加eax，3)上，它将eax的指针向右移动3个点.

On the first add instruction (add eax, 3), it moves the pointer for eax 3 spots to the right.

因此，EAX = 12、17，A3、00.(我了解)

Thus, EAX = 12, 17, A3, 00. (This I understand)

但是，在第二个加法指令(add ebx，5)上，它实际上将值5加到ebx，

But, on the second add instruction (add ebx, 5), it actually adds the value 5 to ebx,

使EBX = 12、17，A3， 05 .

making EBX = 12, 17, A3, 05.

那是为什么?

(小尾数法)

推荐答案

'add reg，(something)'将值添加到寄存器句点.您所看到的区别是寄存器的使用方式.

'add reg, (something)' adds that value to the register, period. The difference you are seeing is how you are using the registers.

在执行'mov ebx，[eax]'时，您将eax中的值用作指针，因为您要用方括号取消引用.

As you are doing 'mov ebx,[eax]' you are using the value in eax as a pointer, because you are de-referencing it with the square brackets.

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