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Problem with arrays and indexes in assembly

 
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NatanM
How do I cheat?
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Joined: 03 Mar 2020
Posts: 7
PostPosted: Thu Jun 22, 2023 12:24 pm    Post subject: Problem with arrays and indexes in assembly Reply with quote
So, I have this code
Code:

[ENABLE]

aobscanmodule(GetPlayerInv,nvar.mfx,8B 42 44 5E 5D) // should be unique
alloc(newmem,$1000)

alloc(invPtr, 24)
registersymbol(invPtr)

alloc(indexPtr, 4)
registersymbol(indexPtr)

label(code)
label(return)
label(initIndex)
label(setAddressAtIndex)

indexPtr:
  db 6 0 0 0

newmem:
  cmp [indexPtr], 5
  jg initIndex
  jmp setAddressAtIndex

initIndex:
  cmp [edx+10], 'Inv1'
  jne code
  mov [indexPtr], 0
  jmp setAddressAtIndex

setAddressAtIndex:
//Crashes here
//mov [invPtr + indexPtr * 4], edx
  add [indexPtr], 1
  jmp code

code:
  mov eax,[edx+44]
  pop esi
  pop ebp
  jmp return

GetPlayerInv:
  jmp newmem
return:
registersymbol(GetPlayerInv)

[DISABLE]

GetPlayerInv:
  db 8B 42 44 5E 5D

unregistersymbol(GetPlayerInv)
dealloc(newmem)

dealloc(invPtr)
unregistersymbol(invPtr)

dealloc(indexPtr)
unregistersymbol(indexPtr)


But it crashes at the label "setAddressAtIndex".
What I want to do is put the address `edx` into the array `invPtr` at index `indexPtr`, can someone help me with that?
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ParkourPenguin
I post too much
Reputation: 152

Joined: 06 Jul 2014
Posts: 4702
PostPosted: Thu Jun 22, 2023 5:41 pm    Post subject: Reply with quote
`mov [invPtr + indexPtr * 4], edx` - this instruction doesn't do what you think it does. `invPtr` and `indexPtr` are both addresses. Treating `invPtr` as an address is probably correct, but you almost certainly want the value at `indexPtr` instead of the address `indexPtr`.
Code:
mov ecx,[indexPtr]
mov [invPtr+ecx*4],edx


Also, this is `jmp` instruction does nothing:
Code:
  jmp setAddressAtIndex

setAddressAtIndex:

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