From nobody Mon Feb 9 18:07:34 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1628493052645534.1022424698899; Mon, 9 Aug 2021 00:10:52 -0700 (PDT) Received: from localhost ([::1]:53342 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mCzQx-0003dn-Ix for importer@patchew.org; Mon, 09 Aug 2021 03:10:51 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58110) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mCzPl-0002d0-V1; Mon, 09 Aug 2021 03:09:37 -0400 Received: from out28-74.mail.aliyun.com ([115.124.28.74]:43172) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mCzPj-0005US-8W; Mon, 09 Aug 2021 03:09:37 -0400 Received: from roman-VirtualBox.hz.ali.com(mailfrom:zhiwei_liu@c-sky.com fp:SMTPD_---.KxLxGJu_1628492967) by smtp.aliyun-inc.com(10.147.41.120); Mon, 09 Aug 2021 15:09:27 +0800 X-Alimail-AntiSpam: AC=CONTINUE; BC=0.1047041|-1; CH=green; DM=|CONTINUE|false|; DS=CONTINUE|ham_system_inform|0.0465328-0.000335014-0.953132; FP=0|0|0|0|0|-1|-1|-1; HT=ay29a033018047199; MF=zhiwei_liu@c-sky.com; NM=1; PH=DS; RN=6; RT=6; SR=0; TI=SMTPD_---.KxLxGJu_1628492967; From: LIU Zhiwei To: qemu-devel@nongnu.org, qemu-riscv@nongnu.org Subject: [PATCH] target/riscv: Add User CSRs read-only check Date: Mon, 9 Aug 2021 15:07:27 +0800 Message-Id: <20210809070727.9245-1-zhiwei_liu@c-sky.com> X-Mailer: git-send-email 2.17.1 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=115.124.28.74; envelope-from=zhiwei_liu@c-sky.com; helo=out28-74.mail.aliyun.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, UNPARSEABLE_RELAY=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: palmer@dabbelt.com, bin.meng@windriver.com, Alistair.Francis@wdc.com, LIU Zhiwei Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1628493054419100001 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: LIU Zhiwei --- target/riscv/csr.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 9a4ed18ac5..ea62d9e653 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -1422,11 +1422,11 @@ RISCVException riscv_csrrw(CPURISCVState *env, int = csrno, RISCVException ret; target_ulong old_value; RISCVCPU *cpu =3D env_archcpu(env); + int read_only =3D get_field(csrno, 0xC00) =3D=3D 3; =20 /* check privileges and return -1 if check fails */ #if !defined(CONFIG_USER_ONLY) int effective_priv =3D env->priv; - int read_only =3D get_field(csrno, 0xC00) =3D=3D 3; =20 if (riscv_has_ext(env, RVH) && env->priv =3D=3D PRV_S && @@ -1443,6 +1443,10 @@ RISCVException riscv_csrrw(CPURISCVState *env, int c= srno, (!env->debugger && (effective_priv < get_field(csrno, 0x300)))) { return RISCV_EXCP_ILLEGAL_INST; } +#else + if (write_mask && read_only) { + return -RISCV_EXCP_ILLEGAL_INST; + } #endif =20 /* ensure the CSR extension is enabled. */ --=20 2.17.1