From patchwork Thu Jun 23 01:49:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chen Zhongjin X-Patchwork-Id: 12891643 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 48507C43334 for ; Thu, 23 Jun 2022 01:56:37 +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=7xKvJwcT16tl6xtzP4nUbZLFBlnRNjvgOOt2jEEdZPI=; b=K3MT0ym+hnZAAQ HOE2i9UX4XYlj8fqfH6HLP+dC0ZZzgRFQF7zCgii0C8M4ZpNSQp1ta+zcq04nlx6rZQgf5gDTM1XB CbFoEUM3vzeCKLaedIGwV4J9BM3fMxDDHs7+VhEJec7230h64m0sJPi+lju6LAcaQet3PFtNrqnfl BV/jGr26UaLIcdkOaKhtuoG3kSGuE/G1az1LSNqpClnRMeH8MJPy2HwKPgQIVOA18KYbeB8154/sn 96sG6PZjt6E5s6KgHIA3D+0nuREnlRwiHzyKSSNsrq2rhHppQPwfvgRQwg047S43Kxuul5CJjozH+ Y+fjg0YK3xJFO8Q/6GnQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1o4C3a-00Clbm-5Z; Thu, 23 Jun 2022 01:54:54 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1o4C0i-00Ck7F-4T for linux-arm-kernel@lists.infradead.org; Thu, 23 Jun 2022 01:52:01 +0000 Received: from dggpemm500020.china.huawei.com (unknown [172.30.72.56]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4LT39q6k6hzkWkG; Thu, 23 Jun 2022 09:50:39 +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; Thu, 23 Jun 2022 09:51:53 +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; Thu, 23 Jun 2022 09:51:52 +0800 From: Chen Zhongjin To: , , , , , CC: , , , , , , , , , , , , , , Subject: [PATCH v6 33/33] objtool: revert c_file fallthrough detection for arm64 Date: Thu, 23 Jun 2022 09:49:17 +0800 Message-ID: <20220623014917.199563-34-chenzhongjin@huawei.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220623014917.199563-1-chenzhongjin@huawei.com> References: <20220623014917.199563-1-chenzhongjin@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.175.36] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) 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-20220622_185156_567679_B20E1511 X-CRM114-Status: GOOD ( 14.04 ) 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 'commit 08feafe8d195 ("objtool: Fix function fallthrough detection for vmlinux")' This commit canceled c_file which used to make fallthrough detection only works on C objects. However in arm64/crypto/aes-mods.S, there are cases that JUMP at the end of function which make objtool wrongly detected them as fall through. Revert c_file before this is fixed. Signed-off-by: Chen Zhongjin --- tools/objtool/check.c | 3 +-- tools/objtool/include/objtool/objtool.h | 2 +- tools/objtool/objtool.c | 1 + 3 files changed, 3 insertions(+), 3 deletions(-) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 8ff7c30df513..95cb88da4ed5 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -541,7 +541,6 @@ static struct instruction *find_last_insn(struct objtool_file *file, struct instruction *insn = NULL; unsigned int offset; unsigned int end = (sec->sh.sh_size > 10) ? sec->sh.sh_size - 10 : 0; - for (offset = sec->sh.sh_size - 1; offset >= end && !insn; offset--) insn = find_insn(file, sec, offset); @@ -3220,7 +3219,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, while (1) { next_insn = next_insn_to_validate(file, insn); - if (func && insn->func && func != insn->func->pfunc) { + if (file->c_file && func && insn->func && func != insn->func->pfunc) { WARN("%s() falls through to next function %s()", func->name, insn->func->name); return 1; diff --git a/tools/objtool/include/objtool/objtool.h b/tools/objtool/include/objtool/objtool.h index a6e72d916807..7a5c13a78f87 100644 --- a/tools/objtool/include/objtool/objtool.h +++ b/tools/objtool/include/objtool/objtool.h @@ -27,7 +27,7 @@ struct objtool_file { struct list_head static_call_list; struct list_head mcount_loc_list; struct list_head endbr_list; - bool ignore_unreachables, hints, rodata; + bool ignore_unreachables, c_file, hints, rodata; unsigned int nr_endbr; unsigned int nr_endbr_int; diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c index 512669ce064c..d33620b1392d 100644 --- a/tools/objtool/objtool.c +++ b/tools/objtool/objtool.c @@ -105,6 +105,7 @@ struct objtool_file *objtool_open_read(const char *_objname) INIT_LIST_HEAD(&file.static_call_list); INIT_LIST_HEAD(&file.mcount_loc_list); INIT_LIST_HEAD(&file.endbr_list); + file.c_file = !opts.link && find_section_by_name(file.elf, ".comment"); file.ignore_unreachables = opts.no_unreachable; file.hints = false;