在实模式汇编（NASM）中通过堆栈传递参数

Question

我正在尝试创建一个简单的函数来比较两个数字并打印消息，说明它们是否相等。 我将第二个数字传递给我的函数时遇到了麻烦，它根本不起作用。

这是我的代码：

   org 0x7e00
   jmp _start

   dados:

   ig: db "iguais", 0xa, 0xd, 0
   dif: db "diferentes", 0xa, 0xd, 0

   PrintString:

   push bp
   mov bp, sp
   mov si, [bp + 4]

   Imprimir:

    lodsb
    cmp al, 0           ;verificar se chegou no fim da string.
    je strEnd    

    mov ah, 0xe          ;interrupcao para escrever charactere
    mov bh, 0            ;pagina
    mov bl, 30           ;linha
    mov cx, 3            ;colunas
    int 10h

    jmp Imprimir

  strEnd: 

   pop bp    
   ret

   ;here's the part that doesn't work 

   comp:

   push bp
   mov bp, sp

   mov cx, [bp + 4]
   mov bx, [bp + 8]
   cmp bx, cx
   je equals
   jne different

 equals:
   pop bp
   push ig
   call PrintString
   ret

different:
  pop bp
  push dif
  call PrintString
  ret

_start:

 mov ax, 3
 push ax

 mov ax, 12
 push ax

 call comp
 jmp $