Re: [Xen-devel] [PATCH-WIP 01/13] xen/arm: use r12 to pass the hypercall number to the hypervisor

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2012-02-28 at 09:46 +0000, Dave Martin wrote:
> On Mon, Feb 27, 2012 at 07:48:45PM +0000, Ian Campbell wrote:
> > Given that Stefano is proposing to make the ISS a (per-hypervisor)
> > constant we could consider just defining the Thumb and non-Thumb
> > constants instead of doing all the construction with the __HVC_IMM stuff
> > -- that would remove a big bit of the macroization.
> 
> It's not quite as simple as that -- emitting instructions using data
> directives is not endianness safe, and even in the cases where .long gives
> the right result for ARM, it gives the wrong result for 32-bit Thumb
> instructions if the opcode is given in human-readable order.

Urk, yes,..

> I was trying to solve the same problem for the kvm guys with some global
> macros -- I'm aiming to get a patch posted soon, so I'll make sure
> you're on CC.

Awesome, thanks!

Ian.


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