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Re: [RFC PATCH v3 2/5] ppc64: Fix semihosting on ppc64le

From: Peter Maydell
Subject: Re: [RFC PATCH v3 2/5] ppc64: Fix semihosting on ppc64le
Date: Thu, 21 Apr 2022 10:13:37 +0100

On Wed, 20 Apr 2022 at 20:52, Richard Henderson
<richard.henderson@linaro.org> wrote:
> On 4/20/22 12:42, Peter Maydell wrote:
> > On Mon, 18 Apr 2022 at 20:19, Leandro Lupori
> > <leandro.lupori@eldorado.org.br> wrote:
> >>
> >> PPC64 CPUs can change its endian dynamically, so semihosting code
> >> must check its MSR at run time to determine if byte swapping is
> >> needed.
> >
> > Arm CPUs also change endianness dynamically, so why is this
> > change PPC-specific ?
> I'm reasonably certain that we simply don't test armbe or aarch64_be 
> semihosting.  Leandro
> found this because qemu-system-ppc64 defaults to BE and qemu-system-aarch64 
> defaults to LE.

Right, so if there's an existing bug here on arm we should fix that,
and that probably means that the abstraction split between
"arch-specific thing" and "non-arch-specific code" is different
from "PPC just overrides the entire swap function".

-- PMM

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