enter/return problem

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mimas

Joined: 21 Jul 2003
Posts: 10

mimas 14 Jan 2004, 16:54

Hi there,
I'm writing a fasm skeleton for PEiD's plugin (DLLs), and I've got problem with macro enter/return

Here is the code of the exported procedure

Code:

proc DoMyJob, hMainDlg, szFname, lpReserved, lpParam
     enter
     invoke MessageBox, [hMainDlg], [szFname], szTitle, MB_ICONWARNING+MB_OK
     mov eax, 2
     return

The plugin makes an error when it returns to the caller. Normaly the stack is "cleaned" in the PEiD code but the enter & leave combo cleans the stack before with a "ret 10" making the EIP to be lose in strange and deeper memory address. So, where is a way to not clean the stack, just a leave & ret not a leave & ret 10 ?

Thanks

14 Jan 2004, 16:54

comrade

Joined: 16 Jun 2003
Posts: 1150
Location: Russian Federation

comrade 15 Jan 2004, 01:10

use cproc, include cdecl.inc

_________________
comrade (comrade64@live.com; http://comrade.ownz.com/)

15 Jan 2004, 01:10

Kevin_Zheng

Joined: 04 Jul 2003
Posts: 125
Location: China

Kevin_Zheng 15 Jan 2004, 04:34

It's another method:
using the belowing code to replace the "return" macro instruction.

Code:

leave
ret

15 Jan 2004, 04:34

mimas

Joined: 21 Jul 2003
Posts: 10

mimas 18 Jan 2004, 21:25

Thanks, I had missed the cdecl.inc.

18 Jan 2004, 21:25

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