32bit_mult_macro.asm

收录了一些简单经典的asm程序有源码

        name 32 bit multiply
data segment
    mulnum dw 0ffffh, 0ffffh, 0ffffh, 0ffffh, 4 dup(?)
data ends

stack segment para stack'stack'
    db 100 dup(?)
stack ends

mulu32 macro
       mov  ax,[bx]
       mov  si,[bx+4]
       mov  di,[bx+6]
       mul  si
       mov  [bx+8],ax
       mov  [bx+0ah],dx
       mov  ax,[bx+2]
       mul  si
       add  ax,[bx+0ah]
       adc  dx,0
       mov  [bx+0ah],ax
       mov  [bx+0ch],dx
       mov  ax,[bx]
       mul  di
       add  ax,[bx+0ah]
       adc  dx,[bx+0ch]
       mov  [bx+0ah],ax
       mov  [bx+0ch],dx
       pushf
       mov  ax,[bx+2]
       mul  di
       popf
       adc  dx,0
       add  ax,[bx+0ch]
       adc  dx,0
       mov  [bx+0ch],ax
       mov  [bx+0eh],dx
       ret
endm

code segment
    assume cs:code,ds:data,ss:stack,es:data
start proc far
begin: push ds
       mov  ax,0
       push ax
       mov  ax,data
       mov  ds,ax
       mov  es,ax
       lea  bx,mulnum
       mulu32
       mulu32
       mulu32
       ret
start endp

code ends
      end begin