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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
[RFC PATCH v3 5/5] tests/tcg/ppc64: Build PowerNV and LE tests, Leandro Lupori, 2022/04/18
[RFC PATCH v3 4/5] tests/tcg/ppc64: Add MMU test sources, Leandro Lupori, 2022/04/18