内中断编程框架解释
1,安装:安装就是把中断需要执行的代码copy到一个空白不使用的区域,一般使用rep movsb指令执行
2,设置中断向量表:中断向量表是中断向量的列表,就是中断处理程序的入口地址,此时需要将要调用的中断入口地址更改为之前copy的区域
3,调用内中断:使用int N,调用内中断
assume cs:code code segment start: mov ax,cs mov ds,ax mov si,offset do0 mov ax,0 mov es,ax mov di,200h mov cx,offset do0end-offset do0 cld rep movsb mov ax,0 mov es,ax mov word ptr es:[0*4],200h mov word ptr es:[0*4+2],0 mov ax,1000h mov bh,01h div bh mov ax,4c00h int 21h do0: jmp short do0start db "overflow!" do0start: mov ax,cs mov ds,ax mov si,202h mov ax,0b800h mov es,ax mov di,12*160+36*2 mov cx,9 s: mov al,[si] mov es:[di],al inc si add di,2 loop s mov ax,4c00h int 21h do0end:nop code ends end start