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80x86????????

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masm – PowerPoint PPT presentation

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Title: 80x86????????


1
?7? ????????
  • ????
  • ???
  • ????
  • ????

2
7.1 ???
  • 7.1.1 ???????????

1. ??? ???? MACRO ?????
... ?? ENDM 2.
??? ???? ???? 3. ???
????????,MASM?????????????,????????????????????
3
  • 4. ??
  • ???????????????????????
  • ????,?????????????,???????????????????????,?????
    ??????
  • ???????MASM??????????????,????????
  • ??????????,?????????????????,MASM???????????????
  • ??????????????,???????????????????

4
??????????????,????????????? back
4CH dosint EQU 21H
dispch MACRO MOV
AH,2 MOV DL, ' '
INT 21H
ENDM
5
code SEGMENT ASSUME
CScode main dispch dispch
MOV AH,back
INT dosint code ENDS
END main
6
??????????? MOV AH,2
MOV DL,'' INT 21H
MOV AH,2 MOV DL,''
INT 21H MOV AH,4CH
INT 21H
7
7.1.2 ????????
  • 1. LOCAL?????????????
  • LOCAL ???,...,???
  • ???????,MASM????????????????????????????(??00
    00 ??FFFF),???????????
  • 2. EXITM ???
  • ?????????,????????????MASM??EXITM?ENDM???????
    ?
  •  

8
??7.16???????? sum MACRO a,b
LOCAL next MOV CX,a LEA
BX,b XOR AX,AX nextADD
AX,BX ADD BX,2 LOOP
next ENDM ???buf1?buf2?????????,????????
sum 5,buf1 sum 7,buf2
9
????????? MOV CX,5 LEA
BX,buf1 XOR AX,AX ??0000ADD
AX,BX ADD BX,2 LOOP
??0000 MOV CX,7 LEA
BX,buf2 XOR AX,AX ??0001ADD
AX,BX ADD BX,2 LOOP
??0001
10
7.1.3 ????
  • 1. lt gt
  • ?????,????????????????,????"lt" ?"gt"?????????
  • 2.
  • ?????,???????????????????,??????????
  • 3.
  • ?????,????????,?MASM?????????????,????????

11
  • 4. !
  • ?????lt?gt??????,MASM????!???????(lt?gt??"?'???)
    ???????????!??????,???!!?!???????????????
  • 5.
  • ?????,???????,?????????
  •  

12
?????????? data MACRO p,q vp
DB q ENDM ????????
x 1 data x,x
x x1 data x,x ??????? 1 v1
DB 1 1 v2 DB 2
13
7.1.3 ??????
  • ????????????3?????v1?v2?v3,??????????,????????????
  • mm1 MACRO x
  • MOV AX,x
  • MUL AX
  • ENDM

14
mm2 MACRO a,b,c mm1 a
MOV BX,AX mm1 b ADD
AX,BX MOV c,AX ENDM ??
mm2 v1,v2,v3
15
?????mm2??? 1 mm1 v1 1 MOV BX,AX 1
mm1 v2 1 ADD AX,BX 1 MOV
v3,AX ????????,????mm1?????????? 2 MOV
AX,v1 2 MUL AX 1 MOV BX,AX 2
MOV AX,v2 2 MUL AX 1 ADD AX,BX
1 MOV v3,AX
16
7.2.4 ?????????
  • ????????????,????????,??????????
  • ???????????CALL?????,??????????????,?????????
  • ????????????????,???????,???????(???????????),???
    ????
  • ??????????????????,?????????????????????????? 

17
7.2 ???
  • 7.2.1 REPEAT

1. ?? REPT ????? ...
??? ENDM 2. ??
???????????????????,????????????
18
?????????1?10???????????????????????
  • x 1
  • REPT 10
  • DB x
  • x x1
  • ENDM
  • ??????????
  • 1 DB 1
  • 1 DB 2
  • 1 DB 9
  • 1 DB 10

19
7.2.2 IRP ???
1. ?? IRP ???, lt???, ..., ???gt
... ??? ENDM 2. ??
?lt gt?????????,??????????????? 3. ??
20
??7.19???SP?????????????7?PUSH??,???????????
IRP regs,ltAX,BX,CX,DX,SI,DI,BPgt PUSH
regs ENDM ????????? 1 PUSH AX 1
PUSH BX 1 PUSH CX 1 PUSH DX 1
PUSH SI 1 PUSH DI 1 PUSH BP
21
7.2.3 IRPC ???
1. ?? IRPC ???,
lt???gt ??????ltgt???? ... ???
ENDM 2. ?? ?IRP????,??????????????,?????????
????
22
7.2.4 ???????
  • ????????????,??????????????,??????
  • ????????,?????????????????,MASM??????????????????
    ?????,?????????
  • ????????????

23
7.3 ????
  • ????????????????????????,???????????????????????
    ??????????????
  • ?????????????
  • IFxx ???
  • lt????1gt
  • ELSE
  • lt????2gt
  • ENDIF

24
  • ??????????IF?IFDEF
  • ????????????
  • ???CPU????????
  • ???????????

25
????
  • ?????????????,????????????,???????????????MASM????
    ???????????
  • MASM???????????REPT?IRP?IRPC?????????,??????????
    ???????????????,???????????
  • ??????,??????????????????????,?????????????,?????
    ?????
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