Question

i have this assembly code in the .text segment, is it possible that i can’t inc a dword that seats in the .text area. if i put some dword that seats in the .data section it works fine, i mean when i switch the line:

01004A72 > 813D 664A0001 >CMP DWORD PTR DS:[1004A66],3E7

with the line

 01004A72   > 813D 664A0001 >CMP DWORD PTR DS:[.data:0100579C],3E7



01004A66     0000           ADD BYTE PTR DS:[EAX],AL
01004A68     0000           ADD BYTE PTR DS:[EAX],AL
01004A6A     00             DB 00
01004A6B     00             DB 00
01004A6C     00             DB 00
01004A6D     00             DB 00
01004A6E     00             DB 00
01004A6F     00             DB 00
01004A70     00             DB 00
01004A71     00             DB 00
01004A72   > 813D 664A0001 >CMP DWORD PTR DS:[1004A66],3E7
01004A7C   . 74 06          JE SHORT winmine3.01004A84
01004A7E     FF05 9C570001  INC DWORD PTR DS:[1004A66]
01004A84    ^E9 CDD5FFFF    JMP winmine3.01002056
01004A89     0000           ADD BYTE PTR DS:[EAX],AL
01004A8B     0000           ADD BYTE PTR DS:[EAX],AL
01004A8D     0000           ADD BYTE PTR DS:[EAX],AL
01004A8F     00             DB 00
01004A90     00             DB 00

Answer 1

The .text segment is a read only section. You should use .bss .data or the stack for modifiable variables.

http://en.wikipedia.org/wiki/Code_segment