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 Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7591EE7D249 for ; Tue, 26 Sep 2023 07:48:49 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id DFA9386C2C; Tue, 26 Sep 2023 09:48:47 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Received: by phobos.denx.de (Postfix, from userid 109) id 767CA86C52; Tue, 26 Sep 2023 09:48:46 +0200 (CEST) Received: from Atcsqr.andestech.com (60-248-80-70.hinet-ip.hinet.net [60.248.80.70]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id 72A85869BC for ; Tue, 26 Sep 2023 09:48:43 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=andestech.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=ycliang@andestech.com Received: from mail.andestech.com (ATCPCS16.andestech.com [10.0.1.222]) by Atcsqr.andestech.com with ESMTP id 38Q7mTA3007739; Tue, 26 Sep 2023 15:48:29 +0800 (+08) (envelope-from ycliang@andestech.com) Received: from swlinux02 (10.0.15.183) by ATCPCS16.andestech.com (10.0.1.222) with Microsoft SMTP Server id 14.3.498.0; Tue, 26 Sep 2023 15:48:27 +0800 Date: Tue, 26 Sep 2023 15:47:25 +0800 From: Leo Liang To: Heinrich Schuchardt CC: Rick Chen , Subject: Re: [PATCH 1/1] cmd/exception: support RISC-V compressed instruction Message-ID: References: <20230921084218.57260-1-heinrich.schuchardt@canonical.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20230921084218.57260-1-heinrich.schuchardt@canonical.com> User-Agent: Mutt/2.2.10 (e0e92c31) (2023-03-25) X-Originating-IP: [10.0.15.183] X-DNSRBL: X-MAIL: Atcsqr.andestech.com 38Q7mTA3007739 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean On Thu, Sep 21, 2023 at 10:42:18AM +0200, Heinrich Schuchardt wrote: > Eliminating the C extension on application processors is under > discussion. > > Support emitting a compressed instruction. This will lead to an > illegal instruction exception if the C extension is not implemented. > > For testing build qemu-riscv64_defconfig with CONFIG_RISCV_ISA_C=n > and run with > > qemu-system-riscv64 -M virt -bios u-boot -nographic -cpu rv64,c=false > > => exception compressed > Unhandled exception: Illegal instruction > EPC: 0000000087731708 RA: 000000008773fe44 TVAL: 0000000000004501 > EPC: 000000008001b708 RA: 0000000080029e44 reloc adjusted > > Code: 0b93 0000 0493 0000 0993 0000 f06f ccdf (4501) > > Signed-off-by: Heinrich Schuchardt > --- > cmd/riscv/exception.c | 18 +++++++++++++++--- > 1 file changed, 15 insertions(+), 3 deletions(-) Reviewed-by: Leo Yu-Chi Liang