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主题 : : 实验15,WINDOWS XP下没有调试成功 [待解决] |
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[ 发表时间:2008-11-28 19:50 ]
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注册日期:2008-11-08 21:55 |
; Template for DOS .exe file
assume cs:cseg, ds:dseg, ss:sseg
; code
cseg segment
start:
; ... put your code here ...
mov ax,sseg
mov ss,ax
mov sp,100h
push cs
pop ds
mov si,offset int9
mov ax,0
mov es,ax
mov di,204h
mov cx,offset int9_end-offset int9
cld
rep movsb
push es:[9*4]
pop es:[200h]
push es:[9*4+2]
pop es:[202h]
cli
mov word ptr es:[9*4],204h
mov word ptr es:[9*4+2],0
sti
; exit to DOS
mov ax, 4C00h
int 21h
int9:
push ax
push bx
push cx
push es
in al,60h
pushf
call word ptr es:[200]
cmp al,9eh
jne int9_ret
mov ax,0b800h
mov es,ax
mov bx,1
mov cx,2000
int9_s:
mov byte ptr es:[bx],'A'
add bx,2
loop int9_s
int9_ret:
pop es
pop cx
pop bx
pop ax
iret
int9_end:nop
cseg ends
; data
dseg segment
dw 10h dup(0)
; ...
dseg ends
; stack
sseg segment stack
db 100h dup(?)
sseg ends
end start | | |
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[ 回复时间:2008-11-30 08:20 ]
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注册日期:2008-08-19 16:07 |
??
出现了什么问题?尝试分析这个问题为什么出现了吗?对于分析是如何验证的?
虚拟dos下不行,是否需要在实dos下调试?(如果需要书上肯定是讲过)
只把代码贴上来找别人给调试没什么诚意啊 呵呵 | | |
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[ 回复时间:2008-11-30 16:33 ]
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注册日期:2008-11-08 21:55 |
; Template for DOS .exe file
assume cs:cseg, ds:dseg, ss:sseg
; code
cseg segment
start:
; ... put your code here ...
mov ax,sseg
mov ss,ax
mov sp,100h
push cs
pop ds
mov si,offset int9
mov ax,0
mov es,ax
mov di,204h
mov cx,offset int9_end-offset int9
cld
rep movsb
push es:[9*4]
pop es:[200h]
push es:[9*4+2]
pop es:[202h]
cli
mov word ptr es:[9*4],204h
mov word ptr es:[9*4+2],0
sti
; exit to DOS
mov ax, 4C00h
int 21h
int9:
push ax
push bx
push cx
push es
in al,60h
pushf
call word ptr cs:[200h] ;这里以前是call word ptr es:[200h] ,错了,现在改过来用cs
cmp al,9eh
jne int9_ret
mov ax,0b800h
mov es,ax
mov bx,0 ;这里以前是mov bx,1,错了,应该是0每个字的低地址为ASCII码
mov cx,2000
int9_s:
mov byte ptr es:[bx],'A'
add bx,2
loop int9_s
int9_ret:
pop es
pop cx
pop bx
pop ax
iret
int9_end:nop
cseg ends
; data
dseg segment
dw 10h dup(0)
; ...
dseg ends
; stack
sseg segment stack
db 100h dup(?)
sseg ends
end start
程序改完了,还是不能在WINDOWS XP 下面调试成功 | | |
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[第3楼]
[ 回复时间:2008-11-30 16:52 ]
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; Template for DOS .exe file
assume cs:cseg, ds:dseg, ss:sseg
; code
cseg segment
start:
; ... put your code here ...
mov ax,sseg
mov ss,ax
mov sp,100h
push cs
pop ds
mov si,offset int9
mov ax,0
mov es,ax
mov di,204h
mov cx,offset int9_end-offset int9
cld
rep movsb
push es:[9*4]
pop es:[200h]
push es:[9*4+2]
pop es:[202h]
cli
mov word ptr es:[9*4],204h
mov word ptr es:[9*4+2],0
sti
; exit to DOS
mov ax, 4C00h
int 21h
int9:
push ax
push bx
push cx
push es
in al,60h
pushf
call dword ptr cs:[200h]
cmp al,9eh
jne int9_ret
mov ax,0b800h
mov es,ax
mov bx,0
mov cx,2000
int9_s:
mov byte ptr es:[bx],'A'
add bx,2
loop int9_s
int9_ret:
pop es
pop cx
pop bx
pop ax
iret
int9_end:nop
cseg ends
; data
dseg segment
dw 10h dup(0)
; ...
dseg ends
; stack
sseg segment stack
db 100h dup(?)
sseg ends
end start
调试成功了。
总结:有时候写程序不能粗心大意,要好好检查,我以上的问题主要有2个:
1. call word ptr es:[200h] ;这里应该是dword双字才能正确调用,并且要用cs段,因为此时cs段地址为0,要用call dword ptr cs:[200h],才能正确访问之前的int 9h中断。
2. mov bx,1 ;这里设置成了高地址,应该是mov bx,0,每个字的低地址为ASCII码 | | |
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