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