From patchwork Mon Dec 18 10:17:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicola Vetrini X-Patchwork-Id: 13496514 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 lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 77E1EC35274 for ; Mon, 18 Dec 2023 10:17:54 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.655805.1023628 (Exim 4.92) (envelope-from ) id 1rFAh0-00066y-On; Mon, 18 Dec 2023 10:17:46 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 655805.1023628; Mon, 18 Dec 2023 10:17:46 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rFAh0-00066l-JT; Mon, 18 Dec 2023 10:17:46 +0000 Received: by outflank-mailman (input) for mailman id 655805; Mon, 18 Dec 2023 10:17:45 +0000 Received: from se1-gles-flk1-in.inumbo.com ([94.247.172.50] helo=se1-gles-flk1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1rFAgz-00055P-4s for xen-devel@lists.xenproject.org; Mon, 18 Dec 2023 10:17:45 +0000 Received: from support.bugseng.com (mail.bugseng.com [162.55.131.47]) by se1-gles-flk1.inumbo.com (Halon) with ESMTPS id ae7ffbaf-9d8e-11ee-9b0f-b553b5be7939; Mon, 18 Dec 2023 11:17:43 +0100 (CET) Received: from nico.bugseng.com (unknown [147.123.100.131]) by support.bugseng.com (Postfix) with ESMTPSA id 674F14EE0C8D; Mon, 18 Dec 2023 11:17:42 +0100 (CET) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: ae7ffbaf-9d8e-11ee-9b0f-b553b5be7939 From: Nicola Vetrini To: xen-devel@lists.xenproject.org Cc: consulting@bugseng.com, Nicola Vetrini , Stefano Stabellini , Julien Grall , Bertrand Marquis , Michal Orzel , Volodymyr Babchuk Subject: [XEN PATCH v2 4/7] xen/arm: traps: add ASSERT_UNREACHABLE() where needed Date: Mon, 18 Dec 2023 11:17:30 +0100 Message-Id: <02070d1bb4bfc0e88d548a529bef8bedab5b3488.1702891792.git.nicola.vetrini@bugseng.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 The statements after a call to the noreturn function 'do_unexpected_trap' can't be reached, thus violating MISRA C:2012 Rule 2.1 ("A project shall not contain unreachable code."). ASSERT_UNREACHABLE() is used to signal that the unreachable break-s are used as a defensive coding measure to prevent inadvertent fallthrough. Signed-off-by: Nicola Vetrini Reviewed-by: Stefano Stabellini --- Changes in v2: - Use ASSERT_UNREACHABLE() to prevent mistakes. --- xen/arch/arm/traps.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/xen/arch/arm/traps.c b/xen/arch/arm/traps.c index 3784e8276ef6..77220ba0927a 100644 --- a/xen/arch/arm/traps.c +++ b/xen/arch/arm/traps.c @@ -2152,6 +2152,7 @@ void do_trap_hyp_sync(struct cpu_user_regs *regs) case HSR_EC_SVE: /* An SVE exception is a bug somewhere in hypervisor code */ do_unexpected_trap("SVE trap at EL2", regs); + ASSERT_UNREACHABLE(); break; #endif case HSR_EC_DATA_ABORT_CURR_EL: @@ -2171,7 +2172,7 @@ void do_trap_hyp_sync(struct cpu_user_regs *regs) dump_hyp_walk(get_hfar(is_data)); do_unexpected_trap(fault, regs); - + ASSERT_UNREACHABLE(); break; } default: