From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 95A5CC43141 for ; Thu, 14 Nov 2019 17:44:33 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 64526206DC for ; Thu, 14 Nov 2019 17:44:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 64526206DC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=keithp.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:60324 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iVJAW-0006RA-Fz for qemu-devel@archiver.kernel.org; Thu, 14 Nov 2019 12:44:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:38607) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iVJ9C-0005PK-AY for qemu-devel@nongnu.org; Thu, 14 Nov 2019 12:43:11 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iVJ9B-0008Kx-Bc for qemu-devel@nongnu.org; Thu, 14 Nov 2019 12:43:10 -0500 Received: from home.keithp.com ([63.227.221.253]:37774 helo=elaine.keithp.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iVJ9B-0008KX-5X for qemu-devel@nongnu.org; Thu, 14 Nov 2019 12:43:09 -0500 Received: from localhost (localhost [127.0.0.1]) by elaine.keithp.com (Postfix) with ESMTP id 3ECF83F29ADC; Thu, 14 Nov 2019 09:43:08 -0800 (PST) X-Virus-Scanned: Debian amavisd-new at keithp.com Received: from elaine.keithp.com ([127.0.0.1]) by localhost (elaine.keithp.com [127.0.0.1]) (amavisd-new, port 10024) with LMTP id 4PelEd9RSo2U; Thu, 14 Nov 2019 09:43:08 -0800 (PST) Received: from keithp.com (koto.keithp.com [10.0.0.2]) by elaine.keithp.com (Postfix) with ESMTPSA id EE52F3F29ADB; Thu, 14 Nov 2019 09:43:07 -0800 (PST) Received: by keithp.com (Postfix, from userid 1000) id D1065158212B; Thu, 14 Nov 2019 09:43:07 -0800 (PST) From: "Keith Packard" To: Alistair Francis , Peter Maydell Subject: Re: [PATCH] Semihost SYS_READC implementation (v4) In-Reply-To: References: <89ada4b1-ee3d-a512-07c2-9bc1ba5806da@redhat.com> <20191024224622.12371-1-keithp@keithp.com> <8736fhm9tw.fsf@linaro.org> <87pnik4w9n.fsf@keithp.com> <87mudo4owu.fsf@keithp.com> <87eeymx603.fsf@keithp.com> Date: Thu, 14 Nov 2019 09:43:07 -0800 Message-ID: <8736equzf8.fsf@keithp.com> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 63.227.221.253 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Atish Patra , Palmer Dabbelt , Alex =?utf-8?Q?Benn=C3=A9e?= , QEMU Developers Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Alistair Francis writes: > This sounds like something that the platform spec should contain. I'm frankly happy with it specifying the semantics by reference to the ARM docs -- that way we can easily share existing code without concern about subtle semantic differences. The only thing that would be useful is to clarify the low-level ABI details about argument passing, but given that the ARM semihosting spec passes arguments in the standard registers, extrapolating that to RISC-V is not exactly difficult. > +Atish +Palmer who are in charge of that. > > @Keith maybe you should contact the platform spec group and ask them > to look into this? I can certainly ask to have the argument passing details clarified; I doubt that group would be interested in adopting the whole semihosting spec and publishing it separately. =2D-=20 =2Dkeith --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEw4O3eCVWE9/bQJ2R2yIaaQAAABEFAl3NkisACgkQ2yIaaQAA ABHpvA//TWpV/tV8OsbsNV9GNGg60sbjOGcSkVuYDwTk2zlOob9QZkksraQGdZOH c8CrVZ4B+Hu6rEb62wpXbsJ9z2bSjQ6CpACHjvgxSMoPJ0MyOUYpRAWAgRhRWz2w eKabN4aU7D7n+vvEBHChJSFqU9UIpFiAX8kUvdev2cHoY0tU4KkZs6ZBeEm6skye LSx4y5yRK/lRBSMRCEqAZyUY7mrp9c2ZRE/T7ZK4sw7zJwRtAs2Y3Tck30t9VceU SA0LB4cWJ9SuG7qoSmVvQq5EsRmrHOc4RvrZH3e01rPa+iUXofHd4tqudPd5JavL bhB5pQF06U5N0Hos+6BssnPGS9pFxwfUo0XWCaiz7KyG+02ggrXrEUZbXts5XKU4 ujiS4DKKarpw7skjTDuoCmyFJKKC4Zo5HDEcfI3GiQuQFaLY2To8Dmn8qq/O90c6 v61WDY8bXcHO6kzgdlO7lBpzkKhFJ57ax3Qf6FeLuetYSXS0J10RM20R5Qzx6z6g ngQSJHLiMKrDsTLfomaeddb+Y4TVfq6zh8pq9qbs9k+uzAPdPnPnYHfRyhWTloqm qOfqFPuEOm0LSjIV/ZYSURzhihuPVyH5pNmk/JpyRIIBc5TjKxrmpwW679GsSXVk BPo2HFNdybqh0vC5Me17SGdKH2XQ+67FtxobIPUncYp0V56afGo= =FNyt -----END PGP SIGNATURE----- --=-=-=--