[2013-08-28 19:48] 实验15
assume cs:codesg
stack segment
db 128 dup(0)
stack ends
codesg segment
start:mov ax,stack
mov ss,ax
mov sp,128
mov ax,cs
mov ds,ax
mov ax,0
mov es,ax
mov si,offset int9
mov di,204h
mov cx,offset int9_end-offset int9
cld
rep movsb
push es:[9*4]
pop es:[200h]
push es:[9*4+2]
pop es:[202h]
cli
mov word ptr es:[9*4],204h
mov word ptr es:[9*4+2],0
sti
stop:jmp stop
mov ax,4c00h
int 21h
int9:push ax
push bx
push cx
push es
in al,60h
pushf
call dword ptr cs:[200h]
cmp al,9eh
jne int9_ret
mov ax,0b800h
mov es,ax
mov bx,0
mov cx,2000
int9_dup:mov byte ptr es:[bx],'A'
add bx,2
loop int9_dup
int9_ret:pop es
pop cx
pop bx
pop ax
iret
int9_end:nop
codesg ends
end start
stack segment
db 128 dup(0)
stack ends
codesg segment
start:mov ax,stack
mov ss,ax
mov sp,128
mov ax,cs
mov ds,ax
mov ax,0
mov es,ax
mov si,offset int9
mov di,204h
mov cx,offset int9_end-offset int9
cld
rep movsb
push es:[9*4]
pop es:[200h]
push es:[9*4+2]
pop es:[202h]
cli
mov word ptr es:[9*4],204h
mov word ptr es:[9*4+2],0
sti
stop:jmp stop
mov ax,4c00h
int 21h
int9:push ax
push bx
push cx
push es
in al,60h
pushf
call dword ptr cs:[200h]
cmp al,9eh
jne int9_ret
mov ax,0b800h
mov es,ax
mov bx,0
mov cx,2000
int9_dup:mov byte ptr es:[bx],'A'
add bx,2
loop int9_dup
int9_ret:pop es
pop cx
pop bx
pop ax
iret
int9_end:nop
codesg ends
end start
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