Leave and Retn

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shism2

Joined: 14 Sep 2005
Posts: 248

shism2 16 Sep 2006, 22:41

Code:

proc tls_callback DllHandle, Reason, Reserved 
.if [entry1],e,1
invoke ExitProcess,0
.else
mov [entry1],1h
.endif

 start3:
     call @@Set_SEH

    
    mov eax,[esp+12]
    add dword [eax+CONTEXT_Eip],2   ;
    mov dword [eax],CONTEXT_FULL
    xor eax,eax
    ret

@@Set_SEH:

The xor eax,eax and ret..... COmpile to xor eax,eax
leave
retn 0C.

Is there anyway to make it not add the leave ?

16 Sep 2006, 22:41

Tomasz Grysztar

Joined: 16 Jun 2003
Posts: 8106
Location: Kraków, Poland

Tomasz Grysztar 16 Sep 2006, 22:44

Perhaps you shouldn't use "proc" macro, since it appears you definitely don't need its features here.

However, if you keep using the macros, use RETN or RETF mnemonics to get the pure instructions, the "ret" in context of "proc" is a macroinstruction.

16 Sep 2006, 22:44

RedGhost

Joined: 18 May 2005
Posts: 443
Location: BC, Canada

RedGhost 16 Sep 2006, 22:50

Is the reserved parameter of DllMain a pointer to the thread's CONTEXT?

_________________
redghost.ca

16 Sep 2006, 22:50

shism2

Joined: 14 Sep 2005
Posts: 248

shism2 17 Sep 2006, 02:54

It's for a tls callback

17 Sep 2006, 02:54

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