参数传递总结

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参数传递大概有3种方式，它们是：通过寄存器传递、通过地址表传递以及通过堆栈传递。
用得最多的是第三种传递方式。

1.         通过寄存器传递参数。
优点：简单易用。
缺点：寄存器数量有限，所以传递参数个数有限
例子：
SUB_CODE SEGMENT
       ASSUME CS:SUB_CODE
       SUBPROG PROC FAR
              PUSH AX
              PUSH DX

              MOV AH , 02H
              MOV DL , BL
              INT 21H

              POP DX
              POP AX

              MOV AH , 4CH
              INT 21H
       SUBPROG ENDP
SUB_CODE ENDS

; MAIN PROGRAM

STACK_SEG SEGMENT
       SPACE DB 100H DUP(?)
STACK_SEG ENDS

DATA_SEG SEGMENT
       PARAM DB 2BH
DATA_SEG ENDS

MAIN_CODE SEGMENT
       MAIN PROC FAR
              ASSUME CS:MAIN_CODE , DS:DATA_SEG , SS:STACK_SEG
              START:
                     MOV BX , DATA_SEG
                     MOV DS , BX

                     MOV BL , [PARAM]

                     CALL FAR PTR SUBPROG

                     MOV AH , 4CH
                     INT 21H
       MAIN ENDP
MAIN_CODE ENDS
       END START

2.         通过地址表传递参数
优点：参数个数不受限制
例子：
SUB_CODE SEGMENT
       ASSUME CS:SUB_CODE
       SUBPROG PROC FAR
              PUSH AX
              PUSH DX

              MOV AH , 02H
              MOV DL ,
              INT 21H

              MOV AH , 02H
              MOV DL ,
              INT 21H

              POP DX
              POP AX

              MOV AH , 4CH
              INT 21H
       SUBPROG ENDP
SUB_CODE ENDS

; MAIN PROGRAM

STACK_SEG SEGMENT
       SPACE DB 100H DUP(?)
STACK_SEG ENDS

DATA_SEG SEGMENT
       PARAM DB 2BH,26H
DATA_SEG ENDS

MAIN_CODE SEGMENT
       MAIN PROC FAR
              ASSUME CS:MAIN_CODE , DS:DATA_SEG , SS:STACK_SEG
              START:
                     MOV BX , DATA_SEG
                     MOV DS , BX

                     MOV BX , OFFSET PARAM

                     CALL FAR PTR SUBPROG

                     MOV AH , 4CH
                     INT 21H
       MAIN ENDP
MAIN_CODE ENDS
       END START

3.         通过堆栈传递参数
使用频率最高
例子：
SUB_CODE SEGMENT
       ASSUME CS:SUB_CODE
       SUBPROG PROC FAR
              PUSH BP
              MOV BP , SP

              PUSH AX
              PUSH DX

              MOV AH , 02H
              MOV DL ,
              INT 21H

              MOV AH , 02H
              MOV DL ,
              INT 21H

              POP DX
              POP AX
              POP BP

              MOV AH , 4CH
              INT 21H
       SUBPROG ENDP
SUB_CODE ENDS

; MAIN PROGRAM

STACK_SEG SEGMENT
       SPACE DB 100H DUP(?)
STACK_SEG ENDS

DATA_SEG SEGMENT
       PARAM DB 2BH,26H
DATA_SEG ENDS

MAIN_CODE SEGMENT
       MAIN PROC FAR
              ASSUME CS:MAIN_CODE , DS:DATA_SEG , SS:STACK_SEG
              START:
                     MOV BX , DATA_SEG
                     MOV DS , BX

                     MOV BX , OFFSET PARAM
                     PUSH
                     PUSH

                     CALL FAR PTR SUBPROG

                     MOV AH , 4CH
                     INT 21H
       MAIN ENDP
MAIN_CODE ENDS
       END START