From mboxrd@z Thu Jan 1 00:00:00 1970 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9DDAACDB47E for ; Wed, 18 Oct 2023 15:46:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232139AbjJRPqF (ORCPT ); Wed, 18 Oct 2023 11:46:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53902 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235231AbjJROXv (ORCPT ); Wed, 18 Oct 2023 10:23:51 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 61E2E120; Wed, 18 Oct 2023 07:14:01 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F11D2C433B7; Wed, 18 Oct 2023 14:13:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697638441; bh=TCNbTE+6TJoRfpfvUgsHM09kzW+uwZaM2+Gsnc4hXaM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AXmhYsR9kHpJ3f/nVvbuQ9pWe5bsboFSBf3GKjjwQyfQga+r8zMPOy/hfjDKZext3 C98rvV4JFHgDNxK/j2pLQT/gLIlOtHrSLNIacUTFsbbJIsaY2m6vzYyAvLB7YbwK2S SADaoK09FUBk7BFGIvOh090I4aib3aypXkKCaSne824e7Mixn8x5pw/+19pvv82vp4 ZxHKjOk9JUziiP2OjxYqkpqxHkgCg/b/7BhBRTG3w1gw94XMQaaWLeYveNNCqAjub1 lRvbB+8F9hhMq2NdyCxSStAM7LBaYTwkuzf4+MSRzBKu312hHI/PjTYKh4q2pwxeVZ kno1cpqIYCurA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Christophe Leroy , Michael Ellerman , Sasha Levin , sv@linux.ibm.com, npiggin@gmail.com, jpoimboe@kernel.org, masahiroy@kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH AUTOSEL 6.1 16/19] powerpc/85xx: Fix math emulation exception Date: Wed, 18 Oct 2023 10:13:18 -0400 Message-Id: <20231018141323.1334898-16-sashal@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20231018141323.1334898-1-sashal@kernel.org> References: <20231018141323.1334898-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.58 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Christophe Leroy [ Upstream commit 8e8a12ecbc86700b5e1a3596ce2b3c43dafad336 ] Booting mpc85xx_defconfig kernel on QEMU leads to: Bad trap at PC: fe9bab0, SR: 2d000, vector=800 awk[82]: unhandled trap (5) at 0 nip fe9bab0 lr fe9e01c code 5 in libc-2.27.so[fe5a000+17a000] awk[82]: code: 3aa00000 3a800010 4bffe03c 9421fff0 7ca62b78 38a00000 93c10008 83c10008 awk[82]: code: 38210010 4bffdec8 9421ffc0 7c0802a6 d8010008 4815190d 93810030 Trace/breakpoint trap WARNING: no useful console This is because allthough CONFIG_MATH_EMULATION is selected, Exception 800 calls unknown_exception(). Call emulation_assist_interrupt() instead. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://msgid.link/066caa6d9480365da9b8ed83692d7101e10ac5f8.1695657339.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin --- arch/powerpc/kernel/head_85xx.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/powerpc/kernel/head_85xx.S b/arch/powerpc/kernel/head_85xx.S index 52c0ab416326a..0e16aea7853b8 100644 --- a/arch/powerpc/kernel/head_85xx.S +++ b/arch/powerpc/kernel/head_85xx.S @@ -394,7 +394,7 @@ interrupt_base: #ifdef CONFIG_PPC_FPU FP_UNAVAILABLE_EXCEPTION #else - EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, unknown_exception) + EXCEPTION(0x0800, FP_UNAVAIL, FloatingPointUnavailable, emulation_assist_interrupt) #endif /* System Call Interrupt */ -- 2.40.1