Re: [Xen-devel] [PATCH v4 5/6] arm64/xen: introduce CONFIG_XEN onARM64

From: Catalin Marinas
Date: Thu Jun 06 2013 - 05:28:18 EST

On Thu, Jun 06, 2013 at 10:03:39AM +0100, Ian Campbell wrote:
> On Wed, 2013-06-05 at 18:02 +0100, Stefano Stabellini wrote:
> > + * the second in r1/x1, the third in r2/x2 and the fourth in r3/x3.
> > + * Considering that Xen hypercalls have 5 arguments at most, the fifth
> > + * paramter is always passed in r4/x4, differently from the ARM
> > + * procedure calling convention of using the stack for that case.
> and "parameter" again.
> Strictly speaking the fifth argument handling only differs from the
> 32-bit PCS, not the 64-bit one. Splitting hairs a bit there.

I agree, just add "the fifth in x4" without "differently from ...", it's
not relevant. You can also remove references to r? registers, they are
only called x?.

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