GCC inline assembly

Hi all,
I know that this may be a really stupid question, but I need some help
with inline assembly on GCC.
I'm trying to make an OS, and i'm having trouble copying register
values to integers with inline assembler
Here is some code:

//begin

int blah;

__asm__ __volatile__ ("mov %%eax,%0": "=g" (blah)::);


// end

I think that theoretically, this should move the eax register into
blah, but it doesn't. IO'm really stuck ,and help would be greatly
appreciated.
Thanks,
Mr Linux Guy

.

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