call指令和ret指令
上代码
assume cs:code,ss:stack
stack segment
db 16 dup(0)
stack ends
code segment
s:
mov bx,16
ret;return to block clode behind the call
start:
mov ax,stack
mov ss,ax
mov ax,16
mov sp,ax
;mov ax,ip can't acquire the value of ip as ip can't read & write
call s; push ip,jmp s,call will save the address of the call to make
;ret return the last line
mov bx,0h
code ends
end start
call相当于,但是ip不能读不能写,就是不能mov所以有call
push ip push到栈里面为了方便ret可以跳回来,ret 就是读取栈里面的ip跳回来
jmp s 跳到s代码块