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Crash on compare

 
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Diambro
Newbie cheater
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Joined: 12 Sep 2023
Posts: 23
Location: Austria
PostPosted: Fri Jun 21, 2024 9:56 am    Post subject: Crash on compare Reply with quote
Hey Community!
Im stumped again and like your help, thanks in advance!

im trying a HP script and everytime a kinda levelswitch occurs (no loading times) a crash happens.

Code:

newmem:
  push ebx
  mov ebx,[ebx+10]
  mov ebx,[ebx+34]
  cmp [ebx+20],1            //Crash happens
  pop ebx
  jne hp_code

hp_godmode:
  mov [ebx+30],(float)value

hp_code:                             //original code
  fcomp dword ptr [ebx+30]
  fnstsw ax
  jmp hp_return


i narrowed it down to the cmp and did the same script in another location, but it crashes too. When im not "changin maps" its working like a charm.

Orginalcode:
Code:

game.GEvent::TryAcquireCancel+7113: F6 C4 05              - test ah,05
game.GEvent::TryAcquireCancel+7116: 7A 04                 - jp game.GEvent::TryAcquireCancel+711C
game.GEvent::TryAcquireCancel+7118: DD D8                 - fstp st(0)
game.GEvent::TryAcquireCancel+711A: D9 E8                 - fld1
game.GEvent::TryAcquireCancel+711C: D9 5C 24 28           - fstp dword ptr [esp+28]
game.GEvent::TryAcquireCancel+7120: D9 44 24 28           - fld dword ptr [esp+28]
game.GEvent::TryAcquireCancel+7124: D9 5B 30              - fstp dword ptr [ebx+30]
game.GEvent::TryAcquireCancel+7127: 8B FB                 - mov edi,ebx
game.GEvent::TryAcquireCancel+7129: E8 82 13 00 00        - call game.GEvent::TryAcquireCancel+84B0
game.GEvent::TryAcquireCancel+712E: D9 EE                 - fldz
// ---------- INJECTING HERE ----------
game.GEvent::TryAcquireCancel+7130: D8 5B 30              - fcomp dword ptr [ebx+30]
// ---------- DONE INJECTING  ----------
game.GEvent::TryAcquireCancel+7133: DF E0                 - fnstsw ax
game.GEvent::TryAcquireCancel+7135: F6 C4 01              - test ah,01
game.GEvent::TryAcquireCancel+7138: 75 1E                 - jne game.GEvent::TryAcquireCancel+7158
game.GEvent::TryAcquireCancel+713A: 80 7B 20 00           - cmp byte ptr [ebx+20],00
game.GEvent::TryAcquireCancel+713E: 8D 4C 24 38           - lea ecx,[esp+38]
game.GEvent::TryAcquireCancel+7142: 51                    - push ecx
game.GEvent::TryAcquireCancel+7143: 0F 94 C0              - sete al
game.GEvent::TryAcquireCancel+7146: 53                    - push ebx
game.GEvent::TryAcquireCancel+7147: 88 84 24 98 00 00 00  - mov [esp+00000098],al
game.GEvent::TryAcquireCancel+714E: E8 BD 2B 00 00        - call game.GEvent::TryAcquireCancel+9D10



I hope i was clear enough, thanks!
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ParkourPenguin
I post too much
Reputation: 152

Joined: 06 Jul 2014
Posts: 4697
PostPosted: Fri Jun 21, 2024 11:01 am    Post subject: Reply with quote
The pointer probably isn't valid in that moment. Maybe the game sets it to null and you can check for that.
Code:
nemem:
  push eax
  mov eax,[ebx+10]
  test eax,eax
  jz hp_code
  mov eax,[eax+34]
  test eax,eax
  jz hp_code
  cmp [eax+20],1
  jne hp_code
  mov [ebx+30],(float)value
hp_code:
  pop eax
  fcomp dword ptr [ebx+30]
  fnstsw ax
  jmp hp_return

If that doesn't work and exceptions are fairly rare, use {$try} / {$except} to let CE's debugger handle them
Code:
nemem:
  push eax
{$try}
  mov eax,[ebx+10]
  mov eax,[eax+34]
  cmp [eax+20],1
  jne hp_code
  mov [ebx+30],(float)value
{$except}
hp_code:
  pop eax
  fcomp dword ptr [ebx+30]
  fnstsw ax
  jmp hp_return

Otherwise, find a better comparison and/or injection point
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Diambro
Newbie cheater
Reputation: 0

Joined: 12 Sep 2023
Posts: 23
Location: Austria
PostPosted: Sat Jun 22, 2024 1:25 am    Post subject: Reply with quote
The first one works like a charm.

And about the second idea with try and except: is the documentary in the forum or in an folder in cheat engine? I should probably read that too.

Thanks again for your quick and easy help!
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ParkourPenguin
I post too much
Reputation: 152

Joined: 06 Jul 2014
Posts: 4697
PostPosted: Sat Jun 22, 2024 10:22 am    Post subject: Reply with quote
There's a page the CE wiki:
https://wiki.cheatengine.org/index.php?title=Auto_Assembler:TRY_EXCEPT

Beyond that, I don't know of any "official" documentation.
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