汇编语言中存储器操作数的访问剖析

Calling Analysis of Memory Operating Data in Assembly Language

汇编语言是计算机软件系统中的基础学科,掌握《汇编语言程序设计》这一学科的难点之一,就是理解存储器操作数地址的形成。即每一个存储在内部存储器上的操作数都有唯一确定的地址(物理地址),这个地址由两部分构成:段地址和段内偏移地址。段地址存放在段寄存器中,而偏移地址存放的位置比较灵活,形成了如直接寻址、间接寻址等多种寻址方式。从分析存储器操作数的存放地址入手,可以更好地理解寻址方式,准确访问存储器操作数。

Assembly language is a basic subject in the software system of com pu ter. One of the difficult points in Assembly Language Programming is to learn th e form of the memory's operating data. It is to say that each operating data sto red in internal memory has its only exact address(physical address),composed of two parts:segment address and effective address. Segment address is stored in the segment register while the storing position of the effective address is very flexible,which develops the various addressing modes,such as direct addressin g and indirect addressing. We can understand the addressing mode better and call it correctly by analyzing the storing position of memory's data operation.