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Index > Macroinstructions > Need macro proc without stack restoration

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twgt



Joined: 23 Jan 2007
Posts: 8
twgt 29 Dec 2007, 08:29
Hi all.
Sorry for my english Smile

I need a macro 'proc ... endp', but without restoring stack.
I creating dll with export, but program, whitch use this dll is call functions in c-convention.
Code:
call My_exported_func
add esp,4 ; for 1 arg
    


Standart proc macro create code
Quote:

My_exported_func:
push ebp
mov ebp,esp
;my code
leave
retn 4


I need 'ret' instead 'retn 4'. How do this(not using manual define my_exported_func:)?
Thanks.
Post 29 Dec 2007, 08:29
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system
revolution 29 Dec 2007, 08:33
Use this:
Code:
proc My_exported_func c param1, param2
...
ret
endp    

The 'c' in there tells it that you a making a cdecl complying proc.
Post 29 Dec 2007, 08:33
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twgt



Joined: 23 Jan 2007
Posts: 8
twgt 29 Dec 2007, 08:36
Thanks!
Post 29 Dec 2007, 08:36
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4624
Location: Argentina
LocoDelAssembly 29 Dec 2007, 16:23
Quote:

I need 'ret' instead 'retn 4'. How do this(not using manual define my_exported_func:)?


Apart of revolution's solution that suits better to your needs you can use retn to skip the automatic generation of leave/retn args*4. This is because proc macro defines a macro called "ret" that produces the aforementioned instructions sequence, that is why ret does not map to retn when you are inside a proc. Note that since the macros are case sensitive using "Ret", "rEt", "RET", etc, also skips the "ret" macro.
Post 29 Dec 2007, 16:23
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twgt



Joined: 23 Jan 2007
Posts: 8
twgt 30 Dec 2007, 10:44
Thanks LocoDelAssembly, I remember this advice.
Post 30 Dec 2007, 10:44
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20333
Location: In your JS exploiting you and your system
revolution 30 Dec 2007, 10:51
Be careful where you use what LocoDelAssembly suggested. Using it like that does not restore the stack from locals, the saved registers or ebp!
Post 30 Dec 2007, 10:51
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