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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 9B92AC47253 for ; Fri, 1 May 2020 13:30:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 76B8420757 for ; Fri, 1 May 2020 13:30:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339851; bh=qEu0WFBLwwFGr/j4YzQwcJbCKPVRRW4ytCD4XaDu31s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=XrWBAKUGP4rc/xfv2zJunUqw2EPDGhoQTtoYnvA16FueTLvhVVoio/CHUlk9wGHF3 vRdpsi0PbMvw3URPa0HDMvT0qtGkKuqjEYh+XraVKgcdxSwKrYGEr3jHyFXimTVrU/ vSqdnEwDD/PLYHDjdWdPOBEasoKqIId6iYTSnsfU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729502AbgEANau (ORCPT ); Fri, 1 May 2020 09:30:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:54898 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730008AbgEANap (ORCPT ); Fri, 1 May 2020 09:30:45 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 355EF208C3; Fri, 1 May 2020 13:30:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339844; bh=qEu0WFBLwwFGr/j4YzQwcJbCKPVRRW4ytCD4XaDu31s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=j8E2qBChgL9prlj0SrbgHqxtm2YIWAcv/CwhpCb3iorUHc1JAJNtZPW7xDKewXrD7 kWDc9JUlppF7bkaPptlG0BnSPWAr4HsV5Zdc2MHRgTl3rYW3W50AagnjF9Cx6SCMqE JfeHc3HrhAbpCTT94kvIdu9ncNciaoQZRoP+P3gw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Josh Poimboeuf , Borislav Petkov , Miroslav Benes , "Peter Zijlstra (Intel)" , Sasha Levin Subject: [PATCH 4.9 70/80] objtool: Support Clang non-section symbols in ORC dump Date: Fri, 1 May 2020 15:22:04 +0200 Message-Id: <20200501131535.692678080@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131513.810761598@linuxfoundation.org> References: <20200501131513.810761598@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Josh Poimboeuf [ Upstream commit 8782e7cab51b6bf01a5a86471dd82228af1ac185 ] Historically, the relocation symbols for ORC entries have only been section symbols: .text+0: sp:sp+8 bp:(und) type:call end:0 However, the Clang assembler is aggressive about stripping section symbols. In that case we will need to use function symbols: freezing_slow_path+0: sp:sp+8 bp:(und) type:call end:0 In preparation for the generation of such entries in "objtool orc generate", add support for reading them in "objtool orc dump". Signed-off-by: Josh Poimboeuf Signed-off-by: Borislav Petkov Reviewed-by: Miroslav Benes Acked-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/b811b5eb1a42602c3b523576dc5efab9ad1c174d.1585761021.git.jpoimboe@redhat.com Signed-off-by: Sasha Levin --- tools/objtool/orc_dump.c | 44 ++++++++++++++++++++++++---------------- 1 file changed, 27 insertions(+), 17 deletions(-) diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c index c3343820916a6..7cbbbdd932f1d 100644 --- a/tools/objtool/orc_dump.c +++ b/tools/objtool/orc_dump.c @@ -78,7 +78,7 @@ int orc_dump(const char *_objname) char *name; size_t nr_sections; Elf64_Addr orc_ip_addr = 0; - size_t shstrtab_idx; + size_t shstrtab_idx, strtab_idx = 0; Elf *elf; Elf_Scn *scn; GElf_Shdr sh; @@ -139,6 +139,8 @@ int orc_dump(const char *_objname) if (!strcmp(name, ".symtab")) { symtab = data; + } else if (!strcmp(name, ".strtab")) { + strtab_idx = i; } else if (!strcmp(name, ".orc_unwind")) { orc = data->d_buf; orc_size = sh.sh_size; @@ -150,7 +152,7 @@ int orc_dump(const char *_objname) } } - if (!symtab || !orc || !orc_ip) + if (!symtab || !strtab_idx || !orc || !orc_ip) return 0; if (orc_size % sizeof(*orc) != 0) { @@ -171,21 +173,29 @@ int orc_dump(const char *_objname) return -1; } - scn = elf_getscn(elf, sym.st_shndx); - if (!scn) { - WARN_ELF("elf_getscn"); - return -1; - } - - if (!gelf_getshdr(scn, &sh)) { - WARN_ELF("gelf_getshdr"); - return -1; - } - - name = elf_strptr(elf, shstrtab_idx, sh.sh_name); - if (!name || !*name) { - WARN_ELF("elf_strptr"); - return -1; + if (GELF_ST_TYPE(sym.st_info) == STT_SECTION) { + scn = elf_getscn(elf, sym.st_shndx); + if (!scn) { + WARN_ELF("elf_getscn"); + return -1; + } + + if (!gelf_getshdr(scn, &sh)) { + WARN_ELF("gelf_getshdr"); + return -1; + } + + name = elf_strptr(elf, shstrtab_idx, sh.sh_name); + if (!name) { + WARN_ELF("elf_strptr"); + return -1; + } + } else { + name = elf_strptr(elf, strtab_idx, sym.st_name); + if (!name) { + WARN_ELF("elf_strptr"); + return -1; + } } printf("%s+%llx:", name, (unsigned long long)rela.r_addend); -- 2.20.1