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Ok - after some serious banging my head against a brick wall, I have found that 64 bit mode, GCC does not, in fact, push its arguments to the stack, but uses rdi to hold the first parameter.

After some Googling, I have found that GCC does use more of a fastcall-type system in 64 bit mode, but I haven't found a decent reference to the specifics of the system it does use. As I am about to write some asm support functions, this information would obviously be useful! I havent even found what I want on the GNU site - this may be my useless search terms, though .

Does anyone know of a good online reference to the calling system GCC uses when I am compiling for long mode?

Cheers,
Adam

http://www.x86-64.org/documentation/abi.pdf

I found this link from the nasm web site - I was approaching it from the other end with the GCC website before.

This link at wikipedia goes over all the x86 calling conventions, and has links to different ABI pdfs as well.

http://en.wikipedia.org/wiki/X86_calling_conventions

A little piece of reflection code i've written for a component system:
http://vwp.svn.sourceforge.net/viewvc/v ... 2/vwpCall/

Since i wrote it on amd64, the amd64-call.cpp and amd64-reflect.cpp offer a pretty much complete reflection support for c++ with support for vtables and creating classes on the fly in addition to calling functions with a list of arguments,.