From patchwork Fri Apr 29 09:43:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen Zhongjin X-Patchwork-Id: 12831703 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 B7DFFC433EF for ; Fri, 29 Apr 2022 09:59:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=gMe92K0Z/2LhDJz1l6sIheXkADxDm5aDgYJQSlbc/so=; b=mAD0EFwG5isdgw q8Md/YESaqJQ2PzNEX5iRk1k4NioPdkBlLzs43bvqyWwhmoQ511eyP18CzjGf2yoLYy//9Uz2V4Xr QSqBNd4VriPzRWK/jgOA0aUQUABz2BE1oD7agY9rS7xzLCb3DssbV0p7ohgFOtDYX0VsqNYNlIAcp oKLrvO7vxqzRsVITtHRLx8wxC/xpm6oS0P3qiaYp+II0v0ollBbVjjh2mSK63ZdX5JR/O0xO7J4iB mnAIKHDYMvyiYo+5iRd5hWO+A12eisrc5JwaE468Sbqpvm1eHHHDMCw4oWtA5zSKKwbgg7I9QR0w9 +omn9E31OAPWipxz02Yg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nkNNw-00AZE8-FB; Fri, 29 Apr 2022 09:58:00 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nkNBz-00ATeN-A1 for linux-arm-kernel@bombadil.infradead.org; Fri, 29 Apr 2022 09:45:39 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Type:MIME-Version:References: In-Reply-To:Message-ID:Date:Subject:CC:To:From:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=rmp76sAuA1V44N2OuRMDj+CIRHwfsW0IL72gFwsc58U=; b=YyW4PRV4JT8vMvRnqog/NvGGZ2 GmoH7ygD5oCMNb6fgZDmocNOimNuuMqBd79u2qB/evB2x5GHmeALVEMGyvGfcw3/QbsJQoX2GEowI qc582XFMJi2lgZ7cgQ8yHgi5H07mCZ0H2umXCSq1hoKQr4nsZBcRHN8Jp2qIIJyPXGeCTsY2F+imM 3CyXC8+MGdDElXKN0xnomqpXCnjmilpF0fzIYtGzx1eBBWKTXFnnlU4lJn3GvP5AIS80J1fkf2Dh7 HadSw8rAezaKdn+HXot0NcrJNd9lKseh4ZKXCogsrVrc2+TiZuIkeYW7fxfl3/4W7uk5qb2b1dbdx axKPbl1Q==; Received: from szxga02-in.huawei.com ([45.249.212.188]) by desiato.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nkNBr-009ZrJ-Cf for linux-arm-kernel@lists.infradead.org; Fri, 29 Apr 2022 09:45:36 +0000 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 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220429_104531_897207_AC334FC3 X-CRM114-Status: UNSURE ( 7.38 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.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