Question

In: Computer Science

Write a subroutine that takes an int (.long) parameter and squares it. The parameter should be...

Write a subroutine that takes an int (.long) parameter and squares it. The parameter should be passed in on the stack. The answer should be returned in eax. The subroutine should not disturb any registers except eax, ecx, and edx. (Save any registers on the stack and restore them before exiting the subroutine.) Upon entry to the subroutine, push ebp, etc., to access the parameter.

Solutions

Expert Solution

[org 100h]
jmp start
var1:dw 4

square:
   pusha
   xor ax,ax
   xor bx,bx
   xor cx,cx
   xor dx,dx
   mov bp,sp
   mov bx,[bp + 14]
   mov cx,bx

   sq:
       add ax, bx
   loop sq

   popa
ret


start:
   xor cx,cx
   mov ax,[var1]
   push ax
   call square

mov ah, 4ch
int 21h

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venereology answered 1 year ago
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