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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 10463C433EF for ; Wed, 8 Sep 2021 17:46:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EBAC161153 for ; Wed, 8 Sep 2021 17:46:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352677AbhIHRrl (ORCPT ); Wed, 8 Sep 2021 13:47:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48558 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1352585AbhIHRrM (ORCPT ); Wed, 8 Sep 2021 13:47:12 -0400 Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98D35C0612A8 for ; Wed, 8 Sep 2021 10:46:01 -0700 (PDT) Received: by mail-pj1-x102f.google.com with SMTP id gp20-20020a17090adf1400b00196b761920aso2068801pjb.3 for ; Wed, 08 Sep 2021 10:46:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=Baz922XdUGTh23cMvISXGBnGRTu0s4UeMCwdvdLeytg=; b=bPFlZkprfGTtM5GKmqvWBCCS8Ea8K6CDkrwOgDrIhEGLjYXU33pJyZ+YgKmoXk4V+u 6CuTDmW4NQbKL6QNZUd3ZhdZ/oZVJ5Tb+G7pIrFi8OGlkWNT1iC2CrIRcu8WfxEm2d3r +8qJXpcY9B2iSDb+cRcW0CxCAwGNltsOb0rdz0S1xPxpf8rBHqhF/zD0YNJJfi2BpZI8 vHW1kBAB5lfubTzhupAmmdVmveWZWEpArXo7gd67n6CJTdgVZ9zcwRaC1dkz85g1qb2I JUAVOGBIqdgxiOla342bOzgmv7N7+gSH8uxYZB1JXPByeG/KETRbWWX+YYFNai8Q4vVg zpJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=Baz922XdUGTh23cMvISXGBnGRTu0s4UeMCwdvdLeytg=; b=wAqStGnf0z6fvr/sv8ic05BbdiWIYgSvfrvMSVf0XQyNejDFqbh9CUZ5Y3rsVXDLr+ wKyTMduyOBuPCSckb/A43QHcX+b4evYufvK/BVjDqv776uxb4LF+m5vJ/5JQTFmeYJxn 35r2Q6ACvEy/u+DJH9hGYw64Xz1wWvKxNOG4YeonR/AHJDjTC7NiG6IUTdvoFCoXK+n3 g2JLmlZ0SBcLfwwoXLkgn3xRRJoZvX9OEI9DwT1K741jUDpODtgZcEmFByJkkXeYWGPu iHIfMpyAagVYXoxfSJyIvxvBS/VVNwsLzWo7K0lUsR/OjhrJ0HXzIfgdDsRI88xElu6L WgjA== X-Gm-Message-State: AOAM531oaY+lQy6K2fAvEdzX3TsVmf+J44PKTreot6+nD25KWMxaF+YK KJ2R9rbJj4xC1ULsOjtFQcDff9v8Lka+Kw== X-Google-Smtp-Source: ABdhPJwVBkkg8Gt0T+XxJWkdO7tCZ5buazt5UIWlW7wDw/gIQ/CynRw1Vj/5W3LGyLCOiEGw4si9pQ== X-Received: by 2002:a17:903:22d0:b0:137:630b:5d7e with SMTP id y16-20020a17090322d000b00137630b5d7emr4082390plg.51.1631123160924; Wed, 08 Sep 2021 10:46:00 -0700 (PDT) Received: from hsinchu16.internal.sifive.com (59-124-168-89.hinet-ip.hinet.net. [59.124.168.89]) by smtp.gmail.com with ESMTPSA id b5sm3108466pfr.26.2021.09.08.10.45.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Sep 2021 10:46:00 -0700 (PDT) From: Greentime Hu To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, aou@eecs.berkeley.edu, palmer@dabbelt.com, paul.walmsley@sifive.com, vincent.chen@sifive.com Subject: [RFC PATCH v8 16/21] riscv: Initialize vector registers with proper vsetvli then it can work normally Date: Thu, 9 Sep 2021 01:45:28 +0800 Message-Id: <5589514eb2d20504725821807800b5bbccf36fe6.1631121222.git.greentime.hu@sifive.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It may cause an illegal instruction exception if it doesn't use vsetvli before vmv.v.i v0, 0. Co-developed-by: Han-Kuan Chen Signed-off-by: Han-Kuan Chen Signed-off-by: Greentime Hu --- arch/riscv/kernel/head.S | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/riscv/kernel/head.S b/arch/riscv/kernel/head.S index cf331f138142..42eb3203fa77 100644 --- a/arch/riscv/kernel/head.S +++ b/arch/riscv/kernel/head.S @@ -442,6 +442,7 @@ ENTRY(reset_regs) li t1, SR_VS csrs CSR_STATUS, t1 + vsetvli t1, x0, e8, m1 vmv.v.i v0, 0 vmv.v.i v1, 0 vmv.v.i v2, 0 -- 2.31.1