assume cs:codesg,ds:data,ss:stack data segment dw 0123h,0456h,0789h,0abch,0defh,0fedh,0cbah,0987h data ends stack segment dw 0,0,0,0,0,0,0,0 stack ends code segment start:mov ax,stack mov ss,ax mov sp,16 ;★将逻辑上设置的栈段真正设为栈
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![assume cs:codesg,ds:data,ss:stack data segment dw 0123h,0456h,0789h,0abch,0defh,0fedh,0cbah,0987h data ends stack segment dw 0,0,0,0,0,0,0,0 stack ends code segment start:mov ax,stack mov ss,ax mov sp,16 ;★将逻辑上设置的栈段真正设为栈](/uploads/image/z/15099191-71-1.jpg?t=assume+cs%3Acodesg%2Cds%3Adata%2Css%3Astack+data+segment+dw+0123h%2C0456h%2C0789h%2C0abch%2C0defh%2C0fedh%2C0cbah%2C0987h+data+ends+stack+segment+dw+0%2C0%2C0%2C0%2C0%2C0%2C0%2C0+stack+ends+code+segment+start%3Amov+ax%2Cstack+mov+ss%2Cax+mov+sp%2C16+%3B%E2%98%85%E5%B0%86%E9%80%BB%E8%BE%91%E4%B8%8A%E8%AE%BE%E7%BD%AE%E7%9A%84%E6%A0%88%E6%AE%B5%E7%9C%9F%E6%AD%A3%E8%AE%BE%E4%B8%BA%E6%A0%88)
assume cs:codesg,ds:data,ss:stack data segment dw 0123h,0456h,0789h,0abch,0defh,0fedh,0cbah,0987h data ends stack segment dw 0,0,0,0,0,0,0,0 stack ends code segment start:mov ax,stack mov ss,ax mov sp,16 ;★将逻辑上设置的栈段真正设为栈
assume cs:codesg,ds:data,ss:stack
data segment
dw 0123h,0456h,0789h,0abch,0defh,0fedh,0cbah,0987h
data ends
stack segment
dw 0,0,0,0,0,0,0,0
stack ends
code segment
start:
mov ax,stack
mov ss,ax
mov sp,16 ;★将逻辑上设置的栈段真正设为栈段区域
mov ax,data ;设置数据区域段地址
mov ds,ax
push ds:[0]
push ds:[2]
pop ds:[2]
pop ds:[0]
mov ax,4c00h
int 21h
code ends
end start
以上是代码源码.
请问五角星处为什么不是8而是16?(stack segment 只覆盖了8个位置)
assume cs:codesg,ds:data,ss:stack data segment dw 0123h,0456h,0789h,0abch,0defh,0fedh,0cbah,0987h data ends stack segment dw 0,0,0,0,0,0,0,0 stack ends code segment start:mov ax,stack mov ss,ax mov sp,16 ;★将逻辑上设置的栈段真正设为栈
堆栈,用 DW 设定了 8 个字,即 16 个字节.
但是,对存储器的操作,都是以字节为单位的.
故此,写 16,就对了.
压栈(或出栈)一次,SP 即要变化两个数.