From: Pierrick Bouvier <pierrick.bouvier@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>,
qemu-arm@nongnu.org, qemu-devel@nongnu.org
Cc: Richard Henderson <richard.henderson@linaro.org>
Subject: Re: [PATCH v2 for-10.1 2/3] linux-user/aarch64: Support TPIDR2_MAGIC signal frame record
Date: Fri, 25 Jul 2025 10:57:38 -0700 [thread overview]
Message-ID: <1b99fd71-d32a-459c-b85c-7185597ac537@linaro.org> (raw)
In-Reply-To: <20250725175510.3864231-3-peter.maydell@linaro.org>
On 7/25/25 10:55 AM, Peter Maydell wrote:
> FEAT_SME adds the TPIDR2 userspace-accessible system register, which
> is used as part of the procedure calling standard's lazy saving
> scheme for the ZA registers:
> https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#66the-za-lazy-saving-scheme
>
> The Linux kernel has a signal frame record for saving
> and restoring this value when calling signal handlers, but
> we forgot to implement this. The result is that code which
> tries to unwind an exception out of a signal handler will
> not work correctly.
>
> Add support for the missing record.
>
> Cc: qemu-stable@nongnu.org
> Fixes: 78011586b90d1 ("target/arm: Enable SME for user-only")
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
> linux-user/aarch64/signal.c | 42 +++++++++++++++++++++++++++++++++++--
> 1 file changed, 40 insertions(+), 2 deletions(-)
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
next prev parent reply other threads:[~2025-07-25 17:58 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-25 17:55 [PATCH v2 for-10.1 0/3] linux-user/aarch64: Fix SME/SME2 signal frame handling Peter Maydell
2025-07-25 17:55 ` [PATCH v2 for-10.1 1/3] linux-user/aarch64: Clear TPIDR2_EL0 when delivering signals Peter Maydell
2025-07-25 17:57 ` Pierrick Bouvier
2025-07-28 16:10 ` Michael Tokarev
2025-07-31 9:57 ` Peter Maydell
2025-07-25 17:55 ` [PATCH v2 for-10.1 2/3] linux-user/aarch64: Support TPIDR2_MAGIC signal frame record Peter Maydell
2025-07-25 17:57 ` Pierrick Bouvier [this message]
2025-07-25 20:20 ` Richard Henderson
2025-07-25 17:55 ` [PATCH v2 for-10.1 3/3] linux-user/aarch64: Support ZT_MAGIC " Peter Maydell
2025-07-25 17:59 ` Pierrick Bouvier
2025-07-25 20:23 ` Richard Henderson
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