Subroutine getting executed twice [emu8086]

Asked Nov 25 '20 at 17:16

Active Nov 25 '20 at 17:18

Viewed 29 times

Can you please tell me why is the subroutine getting executed twice, and how can I fix it?

I have put the code below for reference , while executing I found that the the subroutine BCD_TO_BIN is being executed twice. I don't know why is this happening, can you please tell me what's wrong with this and how to avoid the same happening in the future.

org 100h

.DATA
    BCD_INPUT DB 16H 
    BIN_VALUE DB ?   

.CODE
.STARTUP
         
MOV SI, OFFSET BCD_INPUT
MOV DI, OFFSET BIN_VALUE                          
CALL BCD_TO_BIN                

BCD_TO_BIN PROC NEAR
    PUSHF
    PUSH BX
    PUSH CX
              
    MOV AL, [SI]
    MOV BL, AL      
    AND BL, 0FH
    AND AL, 0F0H
    
    MOV CL, 04H
    ROR AL, CL
             
    MOV BH, 0AH         
    MUL BH
    
    ADD AL, BL
    
    MOV [DI], AL  
         
    POP CX
    POP BX
    POPF 
    RET
BCD_TO_BIN ENDP
.EXIT
END

edited Nov 25 '20 at 17:18

asked Nov 25 '20 at 17:16

Nitin Kumar

After `CALL BCD_TO_BIN` your code falls into the function `BCD_TO_BIN` right below it. Maybe you intended to use `.exit` right after `CALL BCD_TO_BIN`? – Michael Petch Nov 25 '20 at 17:17
Yes Michael that's correct. I want to exit the program after the call... – Nitin Kumar Nov 25 '20 at 17:19
Move `.exit` right after `CALL BCD_TO_BIN` then so that it doesn't fall into the subroutine. – Michael Petch Nov 25 '20 at 17:21
1

Yeah that worked Michael, Thank you so much – Nitin Kumar Nov 25 '20 at 17:28

Subroutine getting executed twice [emu8086]

0 Answers0