From nobody Thu Nov 14 06:43:49 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 1705564756857954.9392133724846; Wed, 17 Jan 2024 23:59:16 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rQNH7-0001zJ-MI; Thu, 18 Jan 2024 02:57:21 -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 1rQNGv-0001p0-Vy; Thu, 18 Jan 2024 02:57:10 -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 1rQNGu-00080r-9n; Thu, 18 Jan 2024 02:57:09 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id 22E4C4504D; Thu, 18 Jan 2024 10:54:37 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id 4C7CA661B5; Thu, 18 Jan 2024 10:54:07 +0300 (MSK) Received: (nullmailer pid 2381732 invoked by uid 1000); Thu, 18 Jan 2024 07:54:05 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Helge Deller , Richard Henderson , Bruno Haible , Michael Tokarev Subject: [Stable-8.2.1 34/38] target/hppa: Avoid accessing %gr0 when raising exception Date: Thu, 18 Jan 2024 10:53:01 +0300 Message-Id: <20240118075404.2381519-34-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: 1705564757085100001 Content-Type: text/plain; charset="utf-8" From: Helge Deller The value of unwind_breg may reference register %r0, but we need to avoid accessing gr0 directly and use the value 0 instead. At runtime I've seen unwind_breg being zero with the Linux kernel when rfi is used to jump to smp_callin(). Signed-off-by: Helge Deller Reviewed-by: Richard Henderson Tested-by: Bruno Haible (cherry picked from commit 5915b67013eb8c3a84e3ef05e6ba4eae55ccd173) Signed-off-by: Michael Tokarev diff --git a/target/hppa/mem_helper.c b/target/hppa/mem_helper.c index 4c28c58ee9..1387f4a64b 100644 --- a/target/hppa/mem_helper.c +++ b/target/hppa/mem_helper.c @@ -341,7 +341,7 @@ raise_exception_with_ior(CPUHPPAState *env, int excp, u= intptr_t retaddr, =20 cpu_restore_state(cs, retaddr); =20 - b =3D env->gr[env->unwind_breg]; + b =3D env->unwind_breg ? env->gr[env->unwind_breg] : 0; b >>=3D (env->psw & PSW_W ? 62 : 30); env->cr[CR_IOR] |=3D b << 62; =20 --=20 2.39.2