| Demosthenes |
2006-05-02 09:17 PM |
Need a debugger for windows
I was playing around with debug for a while, and I think it can't properly handle windows programs. For instance, I wrote a simple piece of code that prints my name for the purpose of looking and tracing through the disassembled code :
Code:
#include <stdio.h>
int main(void)
{
printf("Jamal");
return 0;
}
When I look at the registers and dissasemble it, here is what I get:
Code:
-r
AX=0000 BX=0000 CX=3B2F DX=0000 SP=00B8 BP=0000 SI=0000 DI=0000
DS=0B6D ES=0B6D SS=0B7D CS=0B7D IP=0000 NV UP EI PL NZ NA PO NC
0B7D:0000 0E PUSH CS
-u
0B7D:0000 0E PUSH CS
0B7D:0001 1F POP DS
0B7D:0002 BA0E00 MOV DX,000E
0B7D:0005 B409 MOV AH,09
0B7D:0007 CD21 INT 21
0B7D:0009 B8014C MOV AX,4C01
0B7D:000C CD21 INT 21
0B7D:000E 54 PUSH SP
0B7D:000F 68 DB 68
0B7D:0010 69 DB 69
0B7D:0011 7320 JNB 0033
0B7D:0013 7072 JO 0087
0B7D:0015 6F DB 6F
0B7D:0016 67 DB 67
0B7D:0017 7261 JB 007A
0B7D:0019 6D DB 6D
0B7D:001A 206361 AND [BP+DI+61],AH
0B7D:001D 6E DB 6E
0B7D:001E 6E DB 6E
0B7D:001F 6F DB 6F
I believe the part of the code we're looking at is:
Code:
0B7D:0000 0E PUSH CS
0B7D:0001 1F POP DS
0B7D:0002 BA0E00 MOV DX,000E
0B7D:0005 B409 MOV AH,09
0B7D:0007 CD21 INT 21
0B7D:0009 B8014C MOV AX,4C01
0B7D:000C CD21 INT 21
Now, I tried to dump 0B7D:0000 and this is what I got:
Code:
0B7D:0000 0E 1F BA 0E 00 B4 09 CD-21 B8 01 4C CD 21 54 68 ........!..L.!Th
0B7D:0010 69 73 20 70 72 6F 67 72-61 6D 20 63 61 6E 6E 6F is program canno
0B7D:0020 74 20 62 65 20 72 75 6E-20 69 6E 20 44 4F 53 20 t be run in DOS
0B7D:0030 6D 6F 64 65 2E 0D 0D 0A-24 00 00 00 00 00 00 00 mode....$.......
0B7D:0040 50 45 00 00 4C 01 05 00-94 17 58 44 00 16 00 00 PE..L.....XD....
0B7D:0050 C6 01 00 00 E0 00 07 03-0B 01 02 38 00 0A 00 00 ...........8....
0B7D:0060 00 12 00 00 00 02 00 00-20 12 00 00 00 10 00 00 ........ .......
0B7D:0070 00 20 00 00 00 00 40 00-00 10 00 00 00 02 00 00 . ....@.........
What bothers me is that where my name Jamal should be, it says that the program can't be run in MS-Dos mode. Is there a debugger which will allow me to properly debug this code? |
