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佣勇明
5 years ago
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2 8086/8088 CIP / ISBN X.... TP313 CIP * / /

3 1 2

4 ii 1 2 CAI CAI 3 To the teacher To the student L.G.Alexander 4

5 iii 18 1 PC 2 Debug DOS BIOS CAI zzn@zwu.edu.cn

6 PC Debug CPU DEBUG EXE MASM Jxx DOS/BIOS ASCII

7 vi INT 10H COLOR INT 10H INT 21H PC MOVS LODS STOS CMPS SCAS ASCII ASCII BCD MONO VGA Bresenhem

8 vii XLAT DOS FAT

9 viii 18 BIOS BIOS DOS BIOS MASM /

10 1 CPU RAM MASM [1] [2] MASM [3] 1.1 ( [4]) = = = = ( [5]) Bit Byte Bit Bit Byte

11 2 8 Bit Byte Bit * * * * * * * * Byte Bit Byte 2 Byte 16 Bit Word Bit 0 15 Byte Byte K 1K=1024 Byte K M 1M =1K K= Byte 640K Byte 1 40M Byte Byte 8 Bit Byte ASCII ( [6]) ASCII A Z ( [7]) = = = = 10 Byte Byte ( [8]) 0 1

12 = = = =0 +1 = 1 1 Byte n 2 Byte Byte =0 1+1= = M N M N 0 0 = = = = [9] Byte 4 A 0 ASCII = 48+48= 96 0 Byte Byte Byte N=N

13 = = =0 4 [10] 0000=0 0001=1 0010=2 1001=9 1010= = A = = B = = C = = D = = E = = F = B9 = B = =1001 B9 = B = = = AA EE [11] B Binary D Decimal H Hexadecimal Q D 20H= B=32D= PC PC CPU PC [12] PC PC XT AT [13]

14 1 5 CPU ROM RAM CPU [14] CPU ROM [15] RAM [16] RAM CPU [17] 1 PC 2 ROM RAM 3 CPU 8088 [18] CPU EU BIU BIU EU BIU EU BIU CPU

15 AX BX CX DX [19] AX BX CX DX AH BH CH DH AL BL CL DL SI DI SI source index DI destination index 3 2 SP BP 2 [20] 4 IP 5 FLAGS CPU 16 bit bit O D I T S Z A P C O 1 D S 1 0 I Z T A C P FLAGS 6 4 SS CS DS ES CPU EU 5 4 IP BIU 4 RAM M=1K K= byte M-1[21]

16 1 7 CPU 1 1M 1M=1K K= = M =20 1M 4 SS CS DS ES = = 64K 1M 2 SS CS DS ES = = 4096M =20 1M CPU M K 640K 2 DS BX DS 1 [22] RAM ROM ROM RAM DOS RAM 64K

17 8 Byte 1 Byte 1 PC 3B4AH 4AH 3BH PC A 5A5A 5A 5A5A 5 Byte [1] Assembler ASM Macro Assembler MASM [23] [2] [3] C [4] 60 [5] N n n 1 2 = λ n λ n 1 λ1λ 0 = λ n 2 i = 0 i = 0 1 [24] [6] ASCII American Standard Code for Information Interchange ASCII [25] [7] =57 57 ASCII [8] CPU C

18 1 9 Byte [26] [9] [10] [11] A4B6 2 N 16 M A 16 3 A B 16 1 B A B0 6 A4B6 [12] PC PC IBM PC XT AT PII PIII AT [13] AT [14] CPU Central Processing Unit CPU PU PU CPU [15] ROM Read Only Memory ROM ROM ROM [16] RAM Random Access Memory RAM

19 10 RAM RAM [17] [18] [19] 16 bit = [20] 3 [21] 0 1 [22] [23] Macro [24] = = = [25] ASCII 256 Unicode 1 Word [26] Byte Word Word DW Double Word 32 CPU

20 E 1B7 1FC CPU ROM RAM CPU CPU

21 2 Debug CPU Debug CPU Debug Debug CPU Debug Debug CPU [1] 2.1 CPU [2] XT AT [3] VGA [4] DOS C C> DOS Debug.exe Debug.com DOS [5] DOS 2.0 C> debug [6] [7]

22 2 Debug CPU 13 R [8] CPU 14 AX=0000 BX=0000 CX=0000 DX=0000 SP=FFEE BP=0000 SI=0000 DI=0000 DS=**** [9] ES=**** SS=**** CS=**** IP=0100 NV UP EI PL NZ NA PO NC [10] Debug 14 Flags 9 8 NV UP EI PLNZNA PO NC Flags 9 T Debug Debug T 1 Debug 4 CS DS SS [11] ES [12] -e cs 100 B r CPU **** 0100 B82301 MOV AX 0123 B82301 MOV AX AX T T AX=0123 BX=0000 CX=0000 DX=0000 DS=**** IP=0103 CPU AX H IP MOV AX IP CPU IP IP [13] Debug DOS Q Debug B AX MOV AX AX ADD AX B D8 AX BX MOV BX AX 03 D8 AX BX ADD BX AX

23 14 8B CB BX CX MOV CX BX 2B C8 CX AX CX SUB CX AX 2B C0 AX AX SUB AX AX C3 RET 0100 [14] -e cs 100 B e CS 100 B e CS e CS CS 103 r t [15] q Debug Debug 1 c0 co 2 3 CPU Debug CPU CPU 2.2 CS 0100 H IP -e cs 100 A A ASCII IAH DS

24 2 Debug CPU e ds e ds 06 2A 2A 2A A byte MOV AX [0000] AX AX ADD AX [0002] A AX 0004 MOV [0004] AX MOV AX 0000 MOV AX [16] T d ds 00 u DS 256Byte 2 IP 0 3 CS DS 4 CS DS IP B0 23 MOV AL 23 Byte 2 Byte [17] 2.3 ROM PC 1M RAM ROM ROM ROM 1M 40K ROM 1M ROM FFFFE [18] AT FC D DS 0 ROM ROM ROM

25 16 VGA VGA EGA B8000 H 730K Debug -e B [19] [1] CPU Debug [2] Microsoft Masm 5.0 [3] PC PC [20] [4] VGA VGA [5] C \dos DOS autoexec.bat path path=c:\dos [21] [6] Enter [7] Debug.com Debuy.exe [21] [8] r register debug r CPU debug r debug [9] DS=2121 H 21210h = 132.5K DOS [10] Flags OV DN DI NG ZF AF PE CF DOS SP DS ES SS CS DOS [11]

26 2 Debug CPU 17 [12] 4 [13] 1.2 CPU IP CS IP CS IP [14] Debug CS H [15] DOS ret g Debug ret q Debug [16] MOV [0004] AX A DS [17] CPU 1 2 byte CPU byte [18] ROM ROM ROM [19] B B Debug mode 80 Debug [22] [20] PC PC [21] DOS [22] PC Debug Debug Debug

27 18 D D Dump D D DS E E Edit E DS E CS 103 R R RegisterR R AX AX R Flags -R F T T Trace T CS IP U U Unassembled U CS A A Assemble Debug -A 100 G G Go G CS 100 CS 120 P P Pace T CALL T P P P n n 1 Q Q Quit Debug - Q F Fill G Go A Assemble Debug L Load W Write N Name DOS

28 2 Debug CPU IP 3? 4 Debug IP SP 9 5 Debug CPU 6 CS DS SS 7 T IP H CPU 0200H

29 CPU DOS... STACKSG SEGMENT STACK 'STACK' [1] DB 12 DUP ('STACKSEG') [2] STACKSG ENDS [3]... [4] DATASG SEGMENT 'DATA' [5] DATASG ENDS... CODESG SEGMENT 'CODE' [6] BEGIN PROC FAR [7] ASSUME SS:STACKSG DS:DATASG CS:CODESG ES:NOTHING [8] PUSH DS [9] SUB AX,AX PUSH AX

30 3 21 MOV AX DATASG MOV DS AX [10] NOP [11] RET [12] BEGIN ENDP [13]. CODESG ENDS END BEGIN [14] DOS 2.0 ASSUMESS MOV AX,DATASG MOV DS,AX NOP MOV AH,4CH INT 2IH init.asm C>masm init Warning Errors 0 Severe Errors: 0 [15] 0 init.obj obj exe C>link init init.exe 2 [1] [6] [7] [8] [10] [14] [3] [4] [12] [13] [2] [5] [9] 2

幻灯片 1

幻灯片 1 3 8086 Tel:2656809 tjx@csu.edu.cn 2005-9-14 1 2005-9-14 2 8086 8 8086 8086 7 2005-9-14 3 PC 2005-9-14 4 2005-9-14 5 81616 2005-9-14 6 [ ] MOV AX, 3064H AX=3064H 16AX OP 64H 30H 2005-9-14 7 16 AX BX CX