From nobody Sun Sep 14 16:23:29 2025 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B3514C27C76 for ; Fri, 20 Jan 2023 12:36:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230328AbjATMgV (ORCPT ); Fri, 20 Jan 2023 07:36:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230293AbjATMgM (ORCPT ); Fri, 20 Jan 2023 07:36:12 -0500 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 31061BF8BF; Fri, 20 Jan 2023 04:35:44 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1674218145; x=1705754145; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=+4JYvfJ/BZArt9A+5Y2h+61dVJ0kg1blPxurYa6kQaY=; b=OJU4Ygzq7YJHjJqskpX2HyqlMZofw8IMs7KGILuC/QzzW+PZCTe7lj9V iOHvDtlck2oX6O5nsyhY36fsqUg5YH7bHv4atn+6l7+racO3u66YXUbVs seDTCJXEFnGAlLSjjSfTXebnyo5bs7tmipSCPbGYiD+Gdka8faqMDVYEE WFfTU26zjZ5SGiqzGUqAnDjUKsVbna6ynTwu3IbkWtYe2z9I9GdAJ7YDm 3PvPMkR/5NKA7mbV1JB+wcbuIPFStmcef+Hg935kEf926dkdUyFsi/7X8 q+9U6L0UCQMgAg0qbFA9ktG654iuF4/wFc7E4q00JSZbwVr9wNC4R5lRj w==; X-IronPort-AV: E=McAfee;i="6500,9779,10595"; a="387935298" X-IronPort-AV: E=Sophos;i="5.97,232,1669104000"; d="scan'208";a="387935298" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2023 04:35:36 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10595"; a="692847457" X-IronPort-AV: E=Sophos;i="5.97,232,1669104000"; d="scan'208";a="692847457" Received: from ahunter6-mobl1.ger.corp.intel.com (HELO ahunter-VirtualBox.home\044ger.corp.intel.com) ([10.251.223.163]) by orsmga001-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2023 04:35:33 -0800 From: Adrian Hunter To: Arnaldo Carvalho de Melo Cc: Jiri Olsa , Namhyung Kim , Ian Rogers , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Subject: [PATCH 09/10] perf symbols: Combine handling for SHT_RELA and SHT_REL Date: Fri, 20 Jan 2023 14:34:55 +0200 Message-Id: <20230120123456.12449-10-adrian.hunter@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230120123456.12449-1-adrian.hunter@intel.com> References: <20230120123456.12449-1-adrian.hunter@intel.com> MIME-Version: 1.0 Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" SHT_REL and SHT_RELA are handled the same way. Simplify by combining the handling. Signed-off-by: Adrian Hunter --- tools/perf/util/symbol-elf.c | 75 +++++++++++++----------------------- 1 file changed, 27 insertions(+), 48 deletions(-) diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index 6e4a22acefba..e274f646ac32 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -323,6 +323,23 @@ static char *demangle_sym(struct dso *dso, int kmodule= , const char *elf_name) return demangled; } =20 +struct rel_info { + bool is_rela; + Elf_Data *reldata; + GElf_Rela rela; + GElf_Rel rel; +}; + +static u32 get_rel_symidx(struct rel_info *ri, u32 idx) +{ + if (ri->is_rela) { + gelf_getrela(ri->reldata, idx, &ri->rela); + return GELF_R_SYM(ri->rela.r_info); + } + gelf_getrel(ri->reldata, idx, &ri->rel); + return GELF_R_SYM(ri->rel.r_info); +} + static bool get_plt_sizes(struct dso *dso, GElf_Ehdr *ehdr, GElf_Shdr *shd= r_plt, u64 *plt_header_size, u64 *plt_entry_size) { @@ -353,16 +370,6 @@ static bool get_plt_sizes(struct dso *dso, GElf_Ehdr *= ehdr, GElf_Shdr *shdr_plt, } } =20 -#define elf_section__for_each_rel(reldata, pos, pos_mem, idx, nr_entries) \ - for (idx =3D 0, pos =3D gelf_getrel(reldata, 0, &pos_mem); \ - idx < nr_entries; \ - ++idx, pos =3D gelf_getrel(reldata, idx, &pos_mem)) - -#define elf_section__for_each_rela(reldata, pos, pos_mem, idx, nr_entries)= \ - for (idx =3D 0, pos =3D gelf_getrela(reldata, 0, &pos_mem); \ - idx < nr_entries; \ - ++idx, pos =3D gelf_getrela(reldata, idx, &pos_mem)) - /* * We need to check if we have a .dynsym, so that we can handle the * .plt, synthesizing its symbols, that aren't on the symtabs (be it @@ -378,13 +385,14 @@ int dso__synthesize_plt_symbols(struct dso *dso, stru= ct symsrc *ss) GElf_Shdr shdr_plt; struct symbol *f; GElf_Shdr shdr_rel_plt, shdr_dynsym; - Elf_Data *reldata, *syms, *symstrs; + Elf_Data *syms, *symstrs; Elf_Scn *scn_plt_rel, *scn_symstrs, *scn_dynsym; size_t dynsym_idx; GElf_Ehdr ehdr; char sympltname[1024]; Elf *elf; - int nr =3D 0, symidx, err =3D -1; + int nr =3D 0, err =3D -1; + struct rel_info ri =3D { .is_rela =3D false }; =20 elf =3D ss->elf; ehdr =3D ss->ehdr; @@ -433,8 +441,8 @@ int dso__synthesize_plt_symbols(struct dso *dso, struct= symsrc *ss) * Fetch the relocation section to find the idxes to the GOT * and the symbols in the .dynsym they refer to. */ - reldata =3D elf_getdata(scn_plt_rel, NULL); - if (reldata =3D=3D NULL) + ri.reldata =3D elf_getdata(scn_plt_rel, NULL); + if (!ri.reldata) goto out_elf_end; =20 syms =3D elf_getdata(scn_dynsym, NULL); @@ -456,44 +464,15 @@ int dso__synthesize_plt_symbols(struct dso *dso, stru= ct symsrc *ss) plt_offset =3D shdr_plt.sh_offset; plt_offset +=3D plt_header_size; =20 - if (shdr_rel_plt.sh_type =3D=3D SHT_RELA) { - GElf_Rela pos_mem, *pos; + ri.is_rela =3D shdr_rel_plt.sh_type =3D=3D SHT_RELA; =20 - elf_section__for_each_rela(reldata, pos, pos_mem, idx, - nr_rel_entries) { + if (shdr_rel_plt.sh_type =3D=3D SHT_RELA || + shdr_rel_plt.sh_type =3D=3D SHT_REL) { + for (idx =3D 0; idx < nr_rel_entries; idx++) { const char *elf_name =3D NULL; char *demangled =3D NULL; - symidx =3D GELF_R_SYM(pos->r_info); - gelf_getsym(syms, symidx, &sym); - - elf_name =3D elf_sym__name(&sym, symstrs); - demangled =3D demangle_sym(dso, 0, elf_name); - if (demangled !=3D NULL) - elf_name =3D demangled; - if (*elf_name) - snprintf(sympltname, sizeof(sympltname), "%s@plt", elf_name); - else - snprintf(sympltname, sizeof(sympltname), - "offset_%#" PRIx64 "@plt", plt_offset); - free(demangled); =20 - f =3D symbol__new(plt_offset, plt_entry_size, - STB_GLOBAL, STT_FUNC, sympltname); - if (!f) - goto out_elf_end; - - plt_offset +=3D plt_entry_size; - symbols__insert(&dso->symbols, f); - ++nr; - } - } else if (shdr_rel_plt.sh_type =3D=3D SHT_REL) { - GElf_Rel pos_mem, *pos; - elf_section__for_each_rel(reldata, pos, pos_mem, idx, - nr_rel_entries) { - const char *elf_name =3D NULL; - char *demangled =3D NULL; - symidx =3D GELF_R_SYM(pos->r_info); - gelf_getsym(syms, symidx, &sym); + gelf_getsym(syms, get_rel_symidx(&ri, idx), &sym); =20 elf_name =3D elf_sym__name(&sym, symstrs); demangled =3D demangle_sym(dso, 0, elf_name); --=20 2.34.1