Question

我正在尝试编写一个NASM程序来乘以2个8位数字，但我没有得到超过15的答案。我是初学者，我真的不是它真正的工作...... 请帮忙......

section .data
msg1:db "Enter the numbers:"
len1:equ $-msg1
msg2:db "Product is: "
len2:equ $-msg2

section .bss
a:resb 2
b:resb 2
p1:resb 1
p2:resb 1

section .text
global _start
_start:mov eax,4
   mov ebx,1
   mov ecx,msg1
   mov edx,len1
   int 80h

   mov eax,3
   mov ebx,0
   mov ecx,a
   mov edx,2
   int 80h

   mov eax,3
   mov ebx,0
   mov ecx,b
   mov edx,2
   int 80h

   mov eax,4
   mov ebx,1
   mov ecx,msg2
   mov edx,len2
   int 80h

   clc
   mov ecx,4
   mov al,[b]
   sub al,'0'
   mov ah,[a]
   sub ah,'0'
   shl ah,4
back:mov bl,al
     and bl,01h
     jz ahead
     add al,ah
 ahead:ror al,1
       loop back
       and eax,0000000fh
       daa
       mov ebp,eax
       and eax,000000f0h
       shr eax,4
       add eax,'0'
       mov [p1],eax
       mov eax,4
       mov ebx,1
       mov ecx,p1
       mov edx,1
       int 80h

       mov eax,ebp
       and eax,0000000fh
       add eax,'0'
       mov [p2],eax

       mov eax,4
       mov ebx,1
       mov ecx,p2
       mov edx,1
       int 80h

       mov eax,1
       mov ebx,0
       int 80h

大部分代码实际上都是复制的。互联网上没有太多关于NASM程序的信息

Nasm乘法为8bit

0 个答案: