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 2EEDAC77B7F for ; Mon, 8 May 2023 11:46:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236195AbjEHLqZ (ORCPT ); Mon, 8 May 2023 07:46:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45194 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236176AbjEHLqH (ORCPT ); Mon, 8 May 2023 07:46:07 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A2FD10A0D for ; Mon, 8 May 2023 04:45:49 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C1B33636C6 for ; Mon, 8 May 2023 11:45:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B7821C433EF; Mon, 8 May 2023 11:45:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1683546349; bh=F753jiFqFfVCKZ9Q9CF9z7+WQn9M5M9lyQOMkbb8O9k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=P9I0d46B+nJwbdiLJu7kgc1pz9Vf8Bs/cPiAX73dUR2LJkH1UA9NuWCaWtHq4WBN2 66s1sj9HoKhP0X43MXCMWVjhP+0QnnGDhiInK5A2xM4aXOQOMEOkXGkjhAQ787GXUL bilKy+w/DTs3FbzEwkH/L2ik4tBcu/IgCPiHllbo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Stafford Horne , Sasha Levin Subject: [PATCH 5.15 321/371] openrisc: Properly store r31 to pt_regs on unhandled exceptions Date: Mon, 8 May 2023 11:48:42 +0200 Message-Id: <20230508094824.817424383@linuxfoundation.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230508094811.912279944@linuxfoundation.org> References: <20230508094811.912279944@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Stafford Horne [ Upstream commit 812489ac4dd91144a74ce65ecf232252a2e406fb ] In commit 91993c8c2ed5 ("openrisc: use shadow registers to save regs on exception") the unhandled exception path was changed to do an early store of r30 instead of r31. The entry code was not updated and r31 is not getting stored to pt_regs. This patch updates the entry handler to store r31 instead of r30. We also remove some misleading commented out store r30 and r31 instructrions. I noticed this while working on adding floating point exception handling, This issue probably would never impact anything since we kill the process or Oops right away on unhandled exceptions. Fixes: 91993c8c2ed5 ("openrisc: use shadow registers to save regs on exception") Signed-off-by: Stafford Horne Signed-off-by: Sasha Levin --- arch/openrisc/kernel/entry.S | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S index c68f3349c1741..d32906e89aafd 100644 --- a/arch/openrisc/kernel/entry.S +++ b/arch/openrisc/kernel/entry.S @@ -173,7 +173,6 @@ handler: ;\ l.sw PT_GPR28(r1),r28 ;\ l.sw PT_GPR29(r1),r29 ;\ /* r30 already save */ ;\ -/* l.sw PT_GPR30(r1),r30*/ ;\ l.sw PT_GPR31(r1),r31 ;\ TRACE_IRQS_OFF_ENTRY ;\ /* Store -1 in orig_gpr11 for non-syscall exceptions */ ;\ @@ -211,9 +210,8 @@ handler: ;\ l.sw PT_GPR27(r1),r27 ;\ l.sw PT_GPR28(r1),r28 ;\ l.sw PT_GPR29(r1),r29 ;\ - /* r31 already saved */ ;\ - l.sw PT_GPR30(r1),r30 ;\ -/* l.sw PT_GPR31(r1),r31 */ ;\ + /* r30 already saved */ ;\ + l.sw PT_GPR31(r1),r31 ;\ /* Store -1 in orig_gpr11 for non-syscall exceptions */ ;\ l.addi r30,r0,-1 ;\ l.sw PT_ORIG_GPR11(r1),r30 ;\ -- 2.39.2