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 08895C433EF for ; Fri, 29 Apr 2022 09:45:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354920AbiD2Jst (ORCPT ); Fri, 29 Apr 2022 05:48:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33862 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356762AbiD2Jsg (ORCPT ); Fri, 29 Apr 2022 05:48:36 -0400 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0019C85977; Fri, 29 Apr 2022 02:45:17 -0700 (PDT) Received: from dggpemm500020.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4KqSJQ65SWzhYtC; Fri, 29 Apr 2022 17:44:54 +0800 (CST) Received: from dggpemm500013.china.huawei.com (7.185.36.172) by dggpemm500020.china.huawei.com (7.185.36.49) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 29 Apr 2022 17:45:16 +0800 Received: from ubuntu1804.huawei.com (10.67.175.36) by dggpemm500013.china.huawei.com (7.185.36.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.24; Fri, 29 Apr 2022 17:45:15 +0800 From: Chen Zhongjin To: , , CC: , , , , , , , , , , , , , , Subject: [RFC PATCH v4 34/37] arm64: entry: Annotate valid stack in kernel entry Date: Fri, 29 Apr 2022 17:43:52 +0800 Message-ID: <20220429094355.122389-35-chenzhongjin@huawei.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220429094355.122389-1-chenzhongjin@huawei.com> References: <20220429094355.122389-1-chenzhongjin@huawei.com> MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.175.36] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpemm500013.china.huawei.com (7.185.36.172) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org From: Julien Thierry When taking an exception/interrupt, add unwind hints to indicate from which point the stack pointer is known to be valid. Signed-off-by: Julien Thierry Signed-off-by: Chen Zhongjin --- arch/arm64/kernel/entry.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 10fac8f13982..eeb576ec97ba 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -68,6 +68,7 @@ tbnz x0, #THREAD_SHIFT, 0f sub x0, sp, x0 // x0'' = sp' - x0' = (sp + x0) - sp = x0 sub sp, sp, x0 // sp'' = sp' - x0 = (sp + x0) - x0 = sp + UNWIND_HINT_FUNC sp_offset=S_FRAME_SIZE b el\el\ht\()_\regsize\()_\label 0: @@ -100,6 +101,7 @@ sub sp, sp, x0 mrs x0, tpidrro_el0 #endif + UNWIND_HINT_FUNC sp_offset=S_FRAME_SIZE b el\el\ht\()_\regsize\()_\label .org .Lventry_start\@ + 128 // Did we overflow the ventry slot? .endm -- 2.17.1