linux-kernel - Re: [PATCH v2 0/4] tools/nolibc: MIPS: entrypoint cleanups and N32/N64 ABIs

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Message-ID: <60e78caf-49e5-42ad-900c-9813518d838b@t-8ch.de>
Date: Wed, 26 Mar 2025 22:51:54 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Sebastian Andrzej Siewior <sebastian@...akpoint.cc>
Cc: Willy Tarreau <w@....eu>, Shuah Khan <shuah@...nel.org>, 
	Thomas Bogendoerfer <tsbogend@...ha.franken.de>, "Maciej W. Rozycki" <macro@...am.me.uk>, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-mips@...r.kernel.org
Subject: Re: [PATCH v2 0/4] tools/nolibc: MIPS: entrypoint cleanups and
 N32/N64 ABIs

On 2025-03-26 21:54:34+0100, Sebastian Andrzej Siewior wrote:
> On 2025-02-25 18:02:34 [+0100], Thomas Weißschuh wrote:
> > Introduce support for the N32 and N64 ABIs. As preparation, the
> > entrypoint is first simplified significantly. Thanks to Maciej for all
> > the valuable information.
> > 
> > Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
> 
> Tested-by: Sebastian Andrzej Siewior <sebastian@...akpoint.cc> [ICT Loongson-3]

Thanks!

> mips32le works as-is.
> For mips64le I had to s/-march=mips64r6/-march=mips64r2 to match the
> ABI. Which makes me wonder: Why do do we need to pass -march here and
> can't rely on toolchain defaults?

The goal here is to have an as-wide-as-possible test matrix for
nolibc-test, which will mostly be running on QEMU anyways.
Also we need to run the correct QEMU user variant; by fixing the
architecture this is easy to do.


Thomas