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[CE ASM] Help on storing register value in allocated...

 
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Nuclear898
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PostPosted: Mon Jul 14, 2008 6:10 am    Post subject: [CE ASM] Help on storing register value in allocated... Reply with quote
I need some help,
I'm trying to store the value stored in the EAX register in my registered symbol 'storageX'

I tried this:

alloc(storageX, 4)
registersymbol(storageX)

storageX:
db 00 00 00 00

blablabla:
mov eax, [0086000] // just a random pointer
mov eax, [eax+49c] //just arandom pointer offset
mov storageX, [eax]

but it gives an error when trying to assemble to cheat table
Cannot execute line 34: (mov 0000000, [eax])


how do I solve this?
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DoomsDay
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PostPosted: Mon Jul 14, 2008 6:36 am    Post subject: Reply with quote
mov storageX, [eax] equals to mov [storageX], [eax], which is invalid
Code:
[Enable]
Alloc(Mem,128)
Label(Code)
  Label(start)
Label(Data)
  Label(StorageX)
  RegisterSymbol(StorageX)

Mem:
  Code:
    start:
      mov  eax,[0086000]
      mov  eax,[eax+0000049C]
      push [eax]
      pop  [StorageX]
  Data:
    StorageX:
      dd 00

[Disable]
Dealloc(Mem)
UnregisterSymbol(StorageX)
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Nuclear898
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PostPosted: Mon Jul 14, 2008 7:32 am    Post subject: Reply with quote
Hmm so you just push Eax's value onto the stack and then pop it into StorageX?

but what is this for then?

Code:
    StorageX:
      dd 00
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Jani
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PostPosted: Mon Jul 14, 2008 7:47 am    Post subject: Reply with quote
Nuclear898 wrote:
but what is this for then?

Code:
    StorageX:
      dd 00
Define dword. Same as db 00 00 00 00
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Nuclear898
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PostPosted: Mon Jul 14, 2008 8:06 am    Post subject: Reply with quote
ah ok thanks for helping!
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samuri25404
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PostPosted: Mon Jul 14, 2008 3:54 pm    Post subject: Reply with quote
I think you should be doing

Code:

  MOV EAX, [00860000]
  LEA EAX, [EAX+49C]


And as personal preference, I'd have simply done

Code:

  MOV EAX, [EAX]
  MOV [STORAGE],EAX


But you can do it your way; it works just the same.

Edit:

Btw, when CE allocates the memory, the default for 4 bytes is 00 00 00 00 (00 per byte), so you don't need to do

Code:

Storage:
  db 00 00 00 00

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DoomsDay
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PostPosted: Tue Jul 15, 2008 3:30 am    Post subject: Reply with quote
Hmm, next time I should read the question instead of the script O.O

@x0r: nice warning count =)
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