From patchwork Sat Jan 13 05:57:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Helge Deller X-Patchwork-Id: 13518872 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 365A3C4707B for ; Sat, 13 Jan 2024 05:59:14 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rOX1e-0007QH-5w; Sat, 13 Jan 2024 00:57:46 -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 1rOX1c-0007Pc-OJ for qemu-devel@nongnu.org; Sat, 13 Jan 2024 00:57:44 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rOX1b-00083P-B2 for qemu-devel@nongnu.org; Sat, 13 Jan 2024 00:57:44 -0500 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 323F960A27; Sat, 13 Jan 2024 05:57:42 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id A6104C43390; Sat, 13 Jan 2024 05:57:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1705125461; bh=oUCHbLTLt1MvvljpncvV3usL/WuleAJ+iiuW0ytrHv0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cYREz1eeMe+mwAqt7hjr7GuhGjFX3D8/xzB2BdDY/qjjCgavnsQ6y0W89MR4kVXp6 VVz+XuqVSjWXV8uwEIz/gcC5I2K4BFMURn5iS76cM34U3DdExIwJvKtQ4mDQD+VdiD QGWf5zCls36VCH/Ik710MptMAcJtG4DEUxZuJE+PAvE+/H2qMkvAmejZcZeOpInMfj h7WrBmlWCQboBadRRLySSUju868aZMfdQIqgIuQjpDBKQgMQX3n7CPmQwCOXJVbKPq jsakxqihdd+r38BOAqRQQV6xAf0GDK3j4GpXM8VqScPEC5hXIZIQFoAeuIn4o7BDBT OgWdJIpwiI4pQ== From: deller@kernel.org To: qemu-devel@nongnu.org Cc: Helge Deller , Richard Henderson , Bruno Haible Subject: [PULL 06/10] target/hppa: Avoid accessing %gr0 when raising exception Date: Sat, 13 Jan 2024 06:57:24 +0100 Message-ID: <20240113055729.4480-7-deller@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240113055729.4480-1-deller@kernel.org> References: <20240113055729.4480-1-deller@kernel.org> MIME-Version: 1.0 Received-SPF: pass client-ip=139.178.84.217; envelope-from=deller@kernel.org; helo=dfw.source.kernel.org X-Spam_score_int: -91 X-Spam_score: -9.2 X-Spam_bar: --------- X-Spam_report: (-9.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.09, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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 --- target/hppa/mem_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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, uintptr_t retaddr, cpu_restore_state(cs, retaddr); - b = env->gr[env->unwind_breg]; + b = env->unwind_breg ? env->gr[env->unwind_breg] : 0; b >>= (env->psw & PSW_W ? 62 : 30); env->cr[CR_IOR] |= b << 62;