调试通过
assume cs:code
code segment
start:
mov ax,cs
mov ds,ax
mov si,offset jmpnp ;ds:si指向源地址
mov ax,0
mov es,ax ;es:di指向目的地址
mov di,200
mov cx,offset jmpnpend-offset jmpnp
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
jmpnp:
push bp
mov bp,sp
add [bp+2],bx;相当于修改了IP的值
jmpnpend:
pop bp
iret
code ends
end start |
