顯示string會出現亂碼

hddblue · 发表于 2010-10-19 16:41:51

各位前輩好，以下的程式為在 big_real_mode 讀取記憶體的值

例如： C:\memory.exe(程式檔名) 01000100(Address)

則會顯示01000100位置的值

但是我另外還有要顯示出字串，但是顯示出來都是亂碼

麻煩前輩給我一些指導，謝謝

.model small
.386p
;------------------------------------------------------------------------------------------------
DSEG SEGMENT USE16'data'

DESC STRUC
  LimitL DW 0
  BaseL DW 0
  BaseM DB 0
  Attributes DB 0
  LimitH DB 0
  BaseH DB 0
DESC ENDS

PDesc STRUC
  Limit DW 0
  Base DD 0
PDesc ENDS

GDT_def Label Fword
Null_Desc DESC < 0h, 0h, 00h, 00h, 000h, 0>
Data_Desc DESC < 0FFFFh, 0h, 00h, 92h, 0CFh, 0>
GDT_Addr PDesc <$-GDT_def-1, >

msg1 BYTE 'The Input Address is

'
msg2 BYTE 'The Data is:','$'

DSEG ENDS

;------------------------------------------------------------------------------------------------

ASSUME CS:CSEG,DS

SEG

CSEG SEGMENT USE16'code'

  push ds
  push es
  push fs
  push gs

  call big_real_mode

  mov edx,OFFSET msg1;
  mov ah,09h;
  int 21h;
  mov edx,OFFSET msg2;
  mov ah,09h;
  int 21h;

  call PSP

  call crlf

  mov esi,ebx
  mov eax,fs:[esi]
  out 80h,eax
  mov ebx,eax
  call _8bits

  call real_mode

  pop gs
  pop fs
  pop es
  pop ds

  .exit
;------------------------------------------------------------------------------------------------
big_real_mode proc near
  in al, 92h
  or al, 002
  out 092h, al
  out 0edh, al
  cli
  mov eax,DSEG
  shl eax, 4
  xor ebx, ebx
  mov ebx, offset GDT_def
  add eax, ebx
  mov dword ptr GDT_Addr.Base, eax
  lgdt fword ptr GDT_Addr
  mov bx, 8
  mov eax, cr0
  or al, 1
  mov cr0, eax
  jmp PMod
PMod:
  mov fs, bx
  mov gs, bx
  mov eax,cr0
  and al, 0FEh
  mov cr0, eax
  jmp RMod
RMod:
  xor ax, ax
  mov fs, ax
  mov gs, ax

  sti

  ret
big_real_mode ENDP
;------------------------------------------------------------------------------------------------
real_mode proc near
  in al, 92h
  and al, 02
  out 92h, al
  ret
real_mode ENDP
;------------------------------------------------------------------------------------------------
Get_Commandtail PROC near
  push es
  pusha
  mov ah,62h
  int 21h
  mov es,bx
  popa
  pop es
  ret
Get_Commandtail ENDP
;------------------------------------------------------------------------------------------------
PSP proc near
  mov ah,62h
  int 21h
  mov es,bx
  xor ebx,ebx
  mov si,82h
  mov al,es:[si]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  mov al,es:[si+1]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  mov al,es:[si+2]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  mov al,es:[si+3]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  mov al,es:[si+4]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  mov al,es:[si+5]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  mov al,es:[si+6]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  mov al,es:[si+7]
  call Change
  mov cl,4
  shl ebx,cl
  add ebx,eax
  ret
PSP endp
;------------------------------------------------------------------------------------------------
Change proc near
A:
  movzx eax,al
  mov edx,eax
  cmp eax,'0'
  jb A
  cmp eax,'9'
  ja B
  sub eax,'0'
  jmp short E
B:
  and eax,0dfh
  mov edx,eax
  sub eax,37h
  cmp eax,0ah
  jb A
  cmp eax,0fh
  ja A
E:
  push eax
  call PRT
  pop eax
CExit:
  ret
Change endp
;------------------------------------------------------------------------------------------------
PRT proc near
  mov ah,02h
  int 21h
  ret
PRT endp
;------------------------------------------------------------------------------------------------
crlf proc near
  mov ah,02h
  mov dl,0dh
  int 21h
  mov ah,02h
  mov dl,0ah
  int 21h
  ret
crlf endp
;------------------------------------------------------------------------------------------------
_32bits proc near
  pushad
  mov cl,4
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  call print_4_bits
  rol ebx,cl
  popad
  ret
_32bits endp
;------------------------------------------------------------------------------------------------
_16bits proc near
  pusha
  rol bx,cl
  call print_4_bits
  rol bx,cl
  call print_4_bits
  rol bx,cl
  call print_4_bits
  rol bx,cl
  call print_4_bits
  popa
  ret
_16bits endp
;------------------------------------------------------------------------------------------------
_8bits proc near
  pusha
  rol bx,cl
  call print_4_bits
  rol bx,cl
  call print_4_bits
  popa
  ret
_8bits endp
;------------------------------------------------------------------------------------------------
print_4_bits proc near
  mov dx,bx
  and dl,0fh
  add dl,30h
  cmp dl,3ah
  jb print
  add dl,7
print:
  mov ah,2
  int 21h
  ret
print_4_bits endp
;------------------------------------------------------------------------------------------------
CSEG ends
END

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