From patchwork Wed Sep 4 10:14:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Helge Deller X-Patchwork-Id: 13790330 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 5337CCA0ED3 for ; Wed, 4 Sep 2024 10:15:46 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sln2W-0004W9-Gq; Wed, 04 Sep 2024 06:15:05 -0400 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 1sln2M-0003sz-Aa for qemu-devel@nongnu.org; Wed, 04 Sep 2024 06:14:54 -0400 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sln2J-0002iQ-PJ for qemu-devel@nongnu.org; Wed, 04 Sep 2024 06:14:54 -0400 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 03BE45C3A62; Wed, 4 Sep 2024 10:14:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0566BC4CEC8; Wed, 4 Sep 2024 10:14:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725444890; bh=Ww/ATg0fq9oyEeA7X9+YCqmySLFlQRuRy6f2ZA7sHds=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AvNZZAbr2KXTToRhx5uDVA5wqMNJoGtJO0v5Zfl9QIOJKKcCcBNzKs1KjBBZtbyUO NyQpXpye68zP/3lUZYxKhKtz3k0TQGgJkXZqZ+aMpW3xzxLS4zyAfmgwJ5UegLMQj8 rc2e9mKvlgjf/iZKAID5Sjr8i55ni/Je9d6R+2g+eMpa/0B0a54mWugoKKjJlhHvEN wMEZTChLJAQPkr1tr/K0JJKS+8VJ2hqj1h7wVufZ+E7QzP0CoR60uZdf9nzJ7OEGNk 37cxfjx1fbXz3HvKYwvq22niAvViEiHi9dSJPIc29WqqVW8m+swhf4BbmB5DCtZlv9 aWr+CEIIgrMdg== From: deller@kernel.org To: Richard Henderson , qemu-devel@nongnu.org, Peter Maydell Cc: deller@gmx.de Subject: [PULL 1/2] target/hppa: Fix PSW V-bit packaging in cpu_hppa_get for hppa64 Date: Wed, 4 Sep 2024 12:14:44 +0200 Message-ID: <20240904101445.4127-2-deller@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20240904101445.4127-1-deller@kernel.org> References: <20240904101445.4127-1-deller@kernel.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2604:1380:4641:c500::1; envelope-from=deller@kernel.org; helo=dfw.source.kernel.org X-Spam_score_int: -45 X-Spam_score: -4.6 X-Spam_bar: ---- X-Spam_report: (-4.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.142, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, 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 While adding hppa64 support, the psw_v variable got extended from 32 to 64 bits. So, when packaging the PSW-V bit from the psw_v variable for interrupt processing, check bit 31 instead the 63th (sign) bit. This fixes a hard to find Linux kernel boot issue where the loss of the PSW-V bit due to an ITLB interruption in the middle of a series of ds/addc instructions (from the divU milicode library) generated the wrong division result and thus triggered a Linux kernel crash. Link: https://lore.kernel.org/lkml/718b8afe-222f-4b3a-96d3-93af0e4ceff1@roeck-us.net/ Reported-by: Guenter Roeck Signed-off-by: Helge Deller Reviewed-by: Richard Henderson Tested-by: Guenter Roeck Fixes: 931adff31478 ("target/hppa: Update cpu_hppa_get/put_psw for hppa64") Cc: qemu-stable@nongnu.org # v8.2+ --- target/hppa/cpu.h | 2 +- target/hppa/helper.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/target/hppa/cpu.h b/target/hppa/cpu.h index 2bcb3b602b..5478b183dc 100644 --- a/target/hppa/cpu.h +++ b/target/hppa/cpu.h @@ -211,7 +211,7 @@ typedef struct CPUArchState { uint32_t psw; /* All psw bits except the following: */ uint32_t psw_xb; /* X and B, in their normal positions */ target_ulong psw_n; /* boolean */ - target_long psw_v; /* in most significant bit */ + target_long psw_v; /* in bit 31 */ /* Splitting the carry-borrow field into the MSB and "the rest", allows * for "the rest" to be deleted when it is unused, but the MSB is in use. diff --git a/target/hppa/helper.c b/target/hppa/helper.c index b79ddd8184..d4b1a3cd5a 100644 --- a/target/hppa/helper.c +++ b/target/hppa/helper.c @@ -53,7 +53,7 @@ target_ulong cpu_hppa_get_psw(CPUHPPAState *env) } psw |= env->psw_n * PSW_N; - psw |= (env->psw_v < 0) * PSW_V; + psw |= ((env->psw_v >> 31) & 1) * PSW_V; psw |= env->psw | env->psw_xb; return psw;