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[84.115.238.41]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43f2066d26bsm14597655e9.22.2025.04.09.02.47.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Apr 2025 02:47:44 -0700 (PDT) From: Richard Weinberger To: Nikolaus Funk , xenomai@lists.linux.dev, Jan Kiszka Cc: Richard Weinberger , Johannes Kirchmair , Lorenz Kofler Subject: Re: [PATCH 3/5] arm64: dovetail: Allow early return from traps Date: Wed, 09 Apr 2025 11:47:43 +0200 Message-ID: <3083486.KX7oQKdZxJ@anvil> In-Reply-To: References: <20250408123423.627477-1-nikolaus.funk@sigmatek.at> <20250408123423.627477-4-nikolaus.funk@sigmatek.at> Precedence: bulk X-Mailing-List: xenomai@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On Dienstag, 8. April 2025 19:06 Jan Kiszka wrote: > On 08.04.25 14:34, Nikolaus Funk wrote: > > From: Richard Weinberger > >=20 > > Like on the x86 side, allow early return such that > > handling the exception on the Linux can get avoided. > >=20 >=20 > Which traps can be caught and fully handled in oob this way? From my > past experiments, that list was not very long - and when I look at your > Xenomai 3 changes, it still isn't. What was particularly hard: DABT and > memory access faults. The list is indeed short. So far ARM64_TRAP_UNDI/BTI and ALIGN look good. =20 > Point is that we need to have some kind of consistency, between the > archs and between the reporting information (Linux vs. OOB signals). Or > we extensively need to document where all we are deviating (and ideally > why). I'd vote for the latter. Plus improving the rt_signal_hist test such that others can test whether some exception handling is good enough or nor. So, I suggest exposing more exception but mark/document the known good ones explicitly. Thanks, //richard =2D-=20 =E2=80=8B=E2=80=8B=E2=80=8B=E2=80=8B=E2=80=8Bsigma star gmbh | Eduard-Bodem= =2DGasse 6, 6020 Innsbruck, AUT UID/VAT Nr: ATU 66964118 | FN: 374287y