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王爽《汇编语言》(第三版)检测点13.1(2)

admin 11月 13, 2020 0

用7ch终端例程完成 jmp near ptr s指令的功能.

以下为安装程序代码：

 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:[7ch*4],200h
		mov word ptr es:[7ch*4+2],0
		
		mov ax,4c00h
		int 21h
		
	do0:push bp
		mov bp,sp
		add [bp+2],bx
		pop bp
		iret
		mov ax,4c00h		
		int 21h
	do0end:
		nop
code ends
end start