x64: How to use same calling convention as x32?

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alorent

Joined: 05 Dec 2005
Posts: 221

alorent 13 Oct 2009, 20:02

Hello,

I have the following code in x64:

Code:

MyProc proc Param1, Param2

   mov  rcx, 0
   mov  rax, Param1
   mov  rbx, Param2
   ret

MyProc endp 

; call my above procedure 

stdcall MyProc, 1, 2

The problem is that (of course!) it uses the fastcall convention and put the parameters on registers but I want them on the stack as like I have in 32-bit procedures. I'd like that "stdcall MyProc, 1, 2" generates:

Code:

push 2
push 1
call MyProc

How this can be done? I have tried to do some hack on "PROC64.inc" but that's too advanced for me Smile

Would be great to have another calling convention to produce the above like:

Code:

old_stdcall MyProc, 1, 2

Thanks!

13 Oct 2009, 20:02

Fanael

Joined: 03 Jul 2009
Posts: 168

Fanael 13 Oct 2009, 20:12

Code:

macro old_stdcall proc, [args]
{
  common if ~ args eq
    reverse push args
  common end if
  common call proc
}

If you want to make stdcall function, then you have to forget about existence of proc macro - in 64-bit mode it creates fastcall subroutine. Only way is doing all required things manually (or make your own version of proc macro, which makes stdcall function, but it's difficult thing to do).

13 Oct 2009, 20:12

alorent

Joined: 05 Dec 2005
Posts: 221

alorent 14 Oct 2009, 09:01

Thanks a lot Fanael!! Very Happy

14 Oct 2009, 09:01

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