Re: [discuss] booting a kernel compiled with -mregparm=0

[H. Peter Anvin]

Followup to:  <Pine.LNX.4.61.0501141613500.6747@xxxxxxxxxxxxxxxxxx>
By author:    linux-os <linux-os@xxxxxxxxxxxx>
In newsgroup: linux.dev.kernel
> >
> > Actually -mregparm=0 is not supposed to be even accepted by x86-64
> > compiler (I've disabled the function attribute but apparently missed
> > this one) and even if GCC produced valid code by miracle, you will get
> > into trouble with hand written assembly.
> 
> Huh? That's the default for a 'C' compiler (not to pass parameters
> in registers). The parameters are passed on the stack as the default!
> The return values don't count. They are, by default passed in eax
> or edx-eax pair for a long long.
> 

Dear Wrongbot,

It depends on the architecture ABI.  This is the case for the i386
ABI, but definitely *NOT* for x86-64.

	-hpa
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