CODEWITHSUNDEEP
assemblyx86
Paul
Paul

Reputation: 89

How access data from sp

I am new to assembly. I want to do a subroutine and I need to follow the convention. The caller put the value in register then you push to the stack. In subroutine you need to extract from the stack but I have some problem. Here is my code:

.286
.model huge
.stack 100h

mov bl, 'd' ; just put d to test
push bx
call putch
call terminate

; ---------- void putch(char c) ----------

putch:
; Print character into screen
; bl <- character to be printed

mov bx, [sp+4] ; THIS IS THE ERROR.

mov dl, bl  ; store the argument into dl
mov ah, 2h  ; print the character
int 21h

ret 4       ; return

; ---------- end of function ----------
terminate:
mov ah, 4ch     ; terminate the program
int 21h
END start

My prof said you use mov bx, [sp+offset] to get the value from stack but it doesn't compile. I use 286 assembly. Anyone have a solution?

Upvotes: 1

Views: 87

Answers (1)

Sep Roland
Sep Roland

Reputation: 39411

This does not exist mov bx, [sp+offset] on 286 assembly.

You can use 

mov bp,sp
mov bx,[bp+offset]

Upvotes: 1

Related Questions