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AbrasiveZealot
Newbie cheater
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Joined: 02 Jan 2011
Posts: 21
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 Posted: Fri Jun 13, 2014 7:16 pm Post subject: Assembly, compare register before proceding |
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I've got this bit of code, and it crashes. I can't seem to figure out how to continue.
| Code: |
mov eax,[2380B58] // Start Setting Up Pointer
cmp [eax],00000000 // Compare To Prevent Crashes
je MyThread // If Invalid Restart Thread
mov ebx,[eax+30]
cmp [ebx],00000000
je MyThread
mov eax,[ebx+BC]
cmp [eax],00000000
je MyThread
mov ebx,[eax+3D8]
cmp [ebx],00000000
je MyThread
mov eax,[ebx+35C]
cmp [eax],00000000
je MyThread
mov ebx,[eax+CC]
cmp [ebx],00000000
je MyThread
mov eax,[ebx+14]
cmp [eax],00000000
je MyThread
mov ebx,[eax+160]
cmp [ebx],00000000
je MyThread
mov eax,[ebx+A0] // Finish Setting Up Pointer
cmp [eax],00000000
je MyThread |
The crashing happens when I enter a vehicle, and after debugging it i found why. When in a vehicle the pointer becomes invalid and crashes at this line:
mov ebx,[eax+CC]
It happens because the address pointed at by [eax+CC] doesn't contain any data (?? ?? ?? ??). How can I do a compare to check and see that's it's valid? I've tried doing 2 compares to check and see that the value is good (Value > 00000000 && Value < 7FFFFFFF) but it doesn't work. How can I tell if it's good in assembly?
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justa_dude
Grandmaster Cheater
 Reputation: 23
Joined: 29 Jun 2010
Posts: 893
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| Posted: Fri Jun 13, 2014 7:32 pm Post subject: |
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cmp reg,0
je start
_________________
A nagy kapu mellett, mindig van egy kis kapu.
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AbrasiveZealot
Newbie cheater
![]() Reputation: 0
Joined: 02 Jan 2011
Posts: 21
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| Posted: Fri Jun 13, 2014 8:06 pm Post subject: |
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cmp eax,00000000
cmp [eax],00000000
je MyThread
These both don't trigger a jump
cmp [eax+CC],00000000
And this crashes upon execution because it's comparing something that doesn't exist. So I don't really understand what you mean.
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