int指令跳错地方了

clhjswe

int指令跳错地方了
int 7c
怎么跳到了0:0?

clhjswe

给代码：
1.asm

1. assume cs:code
   
2. code segment
   
3. start:
   
4. mov ax,cs
   
5. mov ds,ax
   
6. mov si,offset example
   
7. mov ax,0
   
8. mov es,ax
   
9. mov di,200h
   
10. mov cx,offset s-offset example
    
11. cld
    
12. rep movsb
    
13. mov ax,0
    
14. mov ds,ax
    
15. mov ds:[7ch],200h
    
16. mov ds:[7ch+2],ax
    
17. mov ax,4c00h
    
18. int 21h
    
19. 
    
20. example:
    
21. ;jmp short s2
    
22. ;s1:
    
23. ;db 'welcome to http://ljw.pe.hu!',0
    
24. ;s2:
    
25. ;mov ax,cs
    
26. ;mov ds,ax
    
27. ;mov si,offset s1-offset example
    
28. 
    
29. ;mov ax,0b800h
    
30. ;mov es,ax
    
31. ;mov di,0
    
32. ;
    
33. ;mov ax,10
    
34. ;dec ax
    
35. ;mov bx,160
    
36. ;mul bx
    
37. ;mov bx,20
    
38. ;dec bx
    
39. ;add bx,ax
    
40. ;mov cx,2
    
41. ;s3:
    
42. ;mov ah,2
    
43. ;mov al,ds:[si]
    
44. ;mov cx,ax
    
45. ;mov ch,0
    
46. ;jcxz s4
    
47. ;mov es:[bx+di],ax
    
48. ;inc si
    
49. ;add di,2
    
50. ;mov cx,2
    
51. ;loop s3
    
52. ;s4:
    
53. 
    
54. mov ax,1234h
    
55. add ax,ax
    
56. iret
    
57. s:
    
58. nop
    
59. code ends
    
60. end start

复制代码

2.asm

1. assume cs:code
   
2. code segment
   
3. start:
   
4. int 7ch
   
5. mov ax,4c00h
   
6. int 21h
   
7. code ends
   
8. end start

复制代码

人造人

1. assume cs:code
   
2. code segment
   
3. start:
   
4. mov ax,cs
   
5. mov ds,ax
   
6. mov si,offset example
   
7. mov ax,0
   
8. mov es,ax
   
9. mov di,200h
   
10. mov cx,offset s-offset example
    
11. cld
    
12. rep movsb
    
13. mov ax,0
    
14. mov ds,ax
    
15. 
    
16. cli
    
17. mov word ptr ds:[7ch * 4], 200h
    
18. mov ds:[7ch * 4 + 2], ax
    
19. sti
    
20. 
    
21. mov ax,4c00h
    
22. int 21h
    
23. 
    
24. example:
    
25. ;jmp short s2
    
26. ;s1:
    
27. ;db 'welcome to http://ljw.pe.hu!',0
    
28. ;s2:
    
29. ;mov ax,cs
    
30. ;mov ds,ax
    
31. ;mov si,offset s1-offset example
    
32. 
    
33. ;mov ax,0b800h
    
34. ;mov es,ax
    
35. ;mov di,0
    
36. ;
    
37. ;mov ax,10
    
38. ;dec ax
    
39. ;mov bx,160
    
40. ;mul bx
    
41. ;mov bx,20
    
42. ;dec bx
    
43. ;add bx,ax
    
44. ;mov cx,2
    
45. ;s3:
    
46. ;mov ah,2
    
47. ;mov al,ds:[si]
    
48. ;mov cx,ax
    
49. ;mov ch,0
    
50. ;jcxz s4
    
51. ;mov es:[bx+di],ax
    
52. ;inc si
    
53. ;add di,2
    
54. ;mov cx,2
    
55. ;loop s3
    
56. ;s4:
    
57. 
    
58. mov ax,1234h
    
59. add ax,ax
    
60. iret
    
61. s:
    
62. nop
    
63. code ends
    
64. end start

复制代码

clhjswe

人造人 发表于 2017-2-9 20:33

知道了，是中断地址那里没有乘4，不过还是谢谢了