From nobody Sat Nov 23 21:46:31 2024 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 1731134759882309.6620190566025; Fri, 8 Nov 2024 22:45:59 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1t9fBx-0001At-Gw; Sat, 09 Nov 2024 01:43:29 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9f9e-0005PF-WD; Sat, 09 Nov 2024 01:41:09 -0500 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1t9f9d-0002Z9-90; Sat, 09 Nov 2024 01:41:06 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id E5C01A12FF; Sat, 9 Nov 2024 09:38:10 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id 5AD1F167DE2; Sat, 9 Nov 2024 09:39:05 +0300 (MSK) Received: (nullmailer pid 3272562 invoked by uid 1000); Sat, 09 Nov 2024 06:39:03 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Evgenii Prokopiev , Daniel Henrique Barboza , Alistair Francis , Michael Tokarev Subject: [Stable-7.2.15 23/33] target/riscv/csr.c: Fix an access to VXSAT Date: Sat, 9 Nov 2024 09:38:49 +0300 Message-Id: <20241109063903.3272404-23-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1731134760413116600 Content-Type: text/plain; charset="utf-8" From: Evgenii Prokopiev The register VXSAT should be RW only to the first bit. The remaining bits should be 0. The RISC-V Instruction Set Manual Volume I: Unprivileged Architecture The vxsat CSR has a single read-write least-significant bit (vxsat[0]) that indicates if a fixed-point instruction has had to saturate an output value to fit into a destination format. Bits vxsat[XLEN-1:1] should be written as zeros. Signed-off-by: Evgenii Prokopiev Reviewed-by: Daniel Henrique Barboza Reviewed-by: Alistair Francis Message-ID: <20241002084436.89347-1-evgenii.prokopiev@syntacore.com> Signed-off-by: Alistair Francis (cherry picked from commit 5a60026cad4e9dba929cab4f63229e4b9110cf0a) Signed-off-by: Michael Tokarev diff --git a/target/riscv/csr.c b/target/riscv/csr.c index 15dba5f653..7a3bc7bea6 100644 --- a/target/riscv/csr.c +++ b/target/riscv/csr.c @@ -494,7 +494,7 @@ static RISCVException write_vxrm(CPURISCVState *env, in= t csrno, static RISCVException read_vxsat(CPURISCVState *env, int csrno, target_ulong *val) { - *val =3D env->vxsat; + *val =3D env->vxsat & BIT(0); return RISCV_EXCP_NONE; } =20 @@ -504,7 +504,7 @@ static RISCVException write_vxsat(CPURISCVState *env, i= nt csrno, #if !defined(CONFIG_USER_ONLY) env->mstatus |=3D MSTATUS_VS; #endif - env->vxsat =3D val; + env->vxsat =3D val & BIT(0); return RISCV_EXCP_NONE; } =20 --=20 2.39.5