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 X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AB6D5C04AA7 for ; Mon, 13 May 2019 17:01:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 85B9120879 for ; Mon, 13 May 2019 17:01:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731188AbfEMRBm (ORCPT ); Mon, 13 May 2019 13:01:42 -0400 Received: from mx1.redhat.com ([209.132.183.28]:36904 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728268AbfEMRBj (ORCPT ); Mon, 13 May 2019 13:01:39 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 02AD23082E69; Mon, 13 May 2019 17:01:39 +0000 (UTC) Received: from treble.redhat.com (ovpn-123-166.rdu2.redhat.com [10.10.123.166]) by smtp.corp.redhat.com (Postfix) with ESMTP id 75B8819C72; Mon, 13 May 2019 17:01:38 +0000 (UTC) From: Josh Poimboeuf To: x86@kernel.org Cc: linux-kernel@vger.kernel.org, Peter Zijlstra Subject: [PATCH 1/2] objtool: Don't use ignore flag for fake jumps Date: Mon, 13 May 2019 12:01:31 -0500 Message-Id: <71abc072ff48b2feccc197723a9c52859476c068.1557766718.git.jpoimboe@redhat.com> In-Reply-To: References: X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.46]); Mon, 13 May 2019 17:01:39 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The ignore flag is set on fake jumps in order to keep add_jump_destinations() from setting their jump_dest, since it already got set when the fake jump was created. But using the ignore flag is a bit of a hack. It's normally used to skip validation of an instruction, which doesn't really make sense for fake jumps. Also, after the next patch, using the ignore flag for fake jumps can trigger a false "why am I validating an ignored function?" warning. Instead just add an explicit check in add_jump_destinations() to skip fake jumps. Signed-off-by: Josh Poimboeuf --- tools/objtool/check.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/tools/objtool/check.c b/tools/objtool/check.c index ac743a1d53ab..90226791df6b 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -28,6 +28,8 @@ #include #include +#define FAKE_JUMP_OFFSET -1 + struct alternative { struct list_head list; struct instruction *insn; @@ -568,7 +570,7 @@ static int add_jump_destinations(struct objtool_file *file) insn->type != INSN_JUMP_UNCONDITIONAL) continue; - if (insn->ignore) + if (insn->ignore || insn->offset == FAKE_JUMP_OFFSET) continue; rela = find_rela_by_dest_range(insn->sec, insn->offset, @@ -745,10 +747,10 @@ static int handle_group_alt(struct objtool_file *file, clear_insn_state(&fake_jump->state); fake_jump->sec = special_alt->new_sec; - fake_jump->offset = -1; + fake_jump->offset = FAKE_JUMP_OFFSET; fake_jump->type = INSN_JUMP_UNCONDITIONAL; fake_jump->jump_dest = list_next_entry(last_orig_insn, list); - fake_jump->ignore = true; + fake_jump->func = orig_insn->func; } if (!special_alt->new_len) { -- 2.17.2