Hi, is there any way to do that with fasm? I know yasm can, but i don't like it much

I need it because I'm trying to play with the "Heaven Gate" in Windows (you know, running 64 bits code inside a 32 bits program)

If I understand you:

Thank you, that's exactly what i was looking for!

and here you have ready samples for win
http://board.flatassembler.net/topic.php?p=140791#140791

Thanks for the examples, but i was faster (hehe) and i coded it before reading them (even so, they were useful, thanks)

Now my question is: i've coded the seh handler, and if anything goes wrong, it redirects me to the x86 mode. Anyway, i need to return from both functions (x64 and x86 mode) with a 32 bits retf (it doesn't make much sense to me, but it works), so i can't declare them with proc and endp, but i need to declare some locals in both of them, so, is there any way to declare local vars in an ebp-frame-less function? Is there any ready-made macro for this?

(in general, it would be useful to have this kind of macro, because there is no need for an EBP-frame, and this wastes a valuable register)

Note: i've read the documentation, and it states that there is a macro that is called whenever fasm has to make a prologue, but i'm looking for a reusable solution (i'm still learning about the preprocessor, i'm very amazed about things like load and store; it is very powerful!)