From patchwork Tue Apr 26 08:21:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 566477 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 DF8B7C43219 for ; Tue, 26 Apr 2022 09:12:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346896AbiDZJMG (ORCPT ); Tue, 26 Apr 2022 05:12:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53112 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346043AbiDZJGn (ORCPT ); Tue, 26 Apr 2022 05:06:43 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4F930151F32; Tue, 26 Apr 2022 01:47:57 -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 E02EA61344; Tue, 26 Apr 2022 08:47:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 016C1C385AF; Tue, 26 Apr 2022 08:47:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650962876; bh=I7E4f3rFKZQ0HQraiuVyxk/qYySAiRYvtrWeIKvVc1c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NZMTo0fg+VL/hIDnqGc/LLtwKiM5qZll6JN7trq809j84M/gy1OC/ThE8uJb2UEy1 UmNW0P5Z2zhCrux7JsLwGNV5lOwxgfPQDuOWQ3Y2lMRYaSTXGyqeu+xMHnYYRJAgwf +CZ2jg/Q/yVBDw2SDfP36xDTj7ioOpvyrZ2LEBnQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Max Filippov Subject: [PATCH 5.17 118/146] xtensa: fix a7 clobbering in coprocessor context load/store Date: Tue, 26 Apr 2022 10:21:53 +0200 Message-Id: <20220426081753.374086021@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220426081750.051179617@linuxfoundation.org> References: <20220426081750.051179617@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Max Filippov commit 839769c35477d4acc2369e45000ca7b0b6af39a7 upstream. Fast coprocessor exception handler saves a3..a6, but coprocessor context load/store code uses a4..a7 as temporaries, potentially clobbering a7. 'Potentially' because coprocessor state load/store macros may not use all four temporary registers (and neither FPU nor HiFi macros do). Use a3..a6 as intended. Cc: stable@vger.kernel.org Fixes: c658eac628aa ("[XTENSA] Add support for configurable registers and coprocessors") Signed-off-by: Max Filippov Signed-off-by: Greg Kroah-Hartman --- arch/xtensa/kernel/coprocessor.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/arch/xtensa/kernel/coprocessor.S +++ b/arch/xtensa/kernel/coprocessor.S @@ -29,7 +29,7 @@ .if XTENSA_HAVE_COPROCESSOR(x); \ .align 4; \ .Lsave_cp_regs_cp##x: \ - xchal_cp##x##_store a2 a4 a5 a6 a7; \ + xchal_cp##x##_store a2 a3 a4 a5 a6; \ jx a0; \ .endif @@ -46,7 +46,7 @@ .if XTENSA_HAVE_COPROCESSOR(x); \ .align 4; \ .Lload_cp_regs_cp##x: \ - xchal_cp##x##_load a2 a4 a5 a6 a7; \ + xchal_cp##x##_load a2 a3 a4 a5 a6; \ jx a0; \ .endif