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Dr.Disrespect
Grandmaster Cheater
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Joined: 17 Feb 2016
Posts: 526
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 Posted: Sun Apr 17, 2016 2:32 am Post subject: Random number generator crashes the game. |
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Please take a look at the following code, which I uses to get a random number between 1-5:
| Code: |
push eax
push ebx
push ecx
push edx
xor eax,eax
xor ebx,ebx
xor ecx,ecx
xor edx,edx
//-------------
call rand
mov ebx,1
mov ecx,5
cmp ecx,ebx
cmovl ecx,ebx
inc ecx
sub ecx,ebx
div ecx <--------------------------this line causes the crash, same result with "idiv"
add edx,ebx
mov [myRandomNumber],edx
//-------------
pop edx
pop ecx
pop ebx
pop eax (I changed the popping order but it still crashes)
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The code above crashes the game, I mark the line that causes the crash. Is there a way to fix it?
Thanks in advance.
Last edited by Dr.Disrespect on Sun Apr 17, 2016 8:51 am; edited 1 time in total |
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++METHOS
I post too much
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Joined: 29 Oct 2010
Posts: 4197
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| Posted: Sun Apr 17, 2016 2:39 am Post subject: |
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| You should paste your script in its entirety. Also, you should pop in reverse order.
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Dr.Disrespect
Grandmaster Cheater
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Joined: 17 Feb 2016
Posts: 526
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| Posted: Sun Apr 17, 2016 8:30 am Post subject: |
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| ++METHOS wrote: | | You should paste your script in its entirety. Also, you should pop in reverse order. |
Sorry for the late reply. Actually that's pretty much it about the code, I just injected the code by using the "code injection" template, and when I checked it step by step, the game crashes when it executed "div ecx". 
Update:
The game does not crash if I removed "call rand", but why?
Last edited by Dr.Disrespect on Sun Apr 17, 2016 8:49 am; edited 1 time in total |
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Dark Byte
Site Admin
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Joined: 09 May 2003
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Location: The netherlands
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| Posted: Sun Apr 17, 2016 8:44 am Post subject: |
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You're popping the registers in the wrong order
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Dr.Disrespect
Grandmaster Cheater
![]() Reputation: 3
Joined: 17 Feb 2016
Posts: 526
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| Posted: Sun Apr 17, 2016 8:50 am Post subject: |
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| Dark Byte wrote: | | You're popping the registers in the wrong order |
I reversed the popping order, but it still crashes the game...
It's the line "div ecx" that causes the crash...
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ParkourPenguin
I post too much
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| Posted: Sun Apr 17, 2016 10:25 am Post subject: |
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edx isn't guaranteed to be preserved across a call. xor it after your call to rand. It probably signaled a divide error exception causing the program to crash.
Setting eax, ecx, and ebx to 0 does nothing. Especially for eax and ecx since they'll be destroyed across that call.
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I don't know where I'm going, but I'll figure it out when I get there. |
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Dr.Disrespect
Grandmaster Cheater
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Joined: 17 Feb 2016
Posts: 526
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| Posted: Sun Apr 17, 2016 3:14 pm Post subject: |
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| ParkourPenguin wrote: | edx isn't guaranteed to be preserved across a call. xor it after your call to rand. It probably signaled a divide error exception causing the program to crash.
Setting eax, ecx, and ebx to 0 does nothing. Especially for eax and ecx since they'll be destroyed across that call. |
Thank you Penguin, i will give it a try. 
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