Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756214Ab0HILVy (ORCPT ); Mon, 9 Aug 2010 07:21:54 -0400 Received: from cam-admin0.cambridge.arm.com ([217.140.96.50]:49507 "EHLO cam-admin0.cambridge.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756152Ab0HILVx (ORCPT ); Mon, 9 Aug 2010 07:21:53 -0400 From: Dave Martin To: Arnaldo Carvalho de Melo Cc: linux-kernel@vger.kernel.org, Dave Martin Subject: [PATCH 1/1] perf symbols: ignore mapping symbols on ARM Date: Mon, 9 Aug 2010 12:21:18 +0100 Message-Id: <1281352878-8735-2-git-send-email-dave.martin@linaro.org> X-Mailer: git-send-email 1.7.0.4 In-Reply-To: <1281352878-8735-1-git-send-email-dave.martin@linaro.org> References: <1281352878-8735-1-git-send-email-dave.martin@linaro.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1657 Lines: 46 Applies to linux-2.6-tip/master or acme/perf-core ARM ELF files use symbols with special names $a, $t, $d to identify regions of ARM code, Thumb code and data within code sections. This can cause confusing output from the perf tools, especially for partially stripped binaries, or binaries containing user-added zero-sized symbols (which may occur in hand-written assembler which hasn't been fully annotated with .size directives). This patch filters out these symbols at load time. Signed-off-by: Dave Martin --- tools/perf/util/symbol.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index b6f5970..1a36773 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1079,6 +1079,16 @@ static int dso__load_sym(struct dso *self, struct map *map, const char *name, if (!is_label && !elf_sym__is_a(&sym, map->type)) continue; + /* Reject ARM ELF "mapping symbols": these aren't unique and + * don't identify functions, so will confuse the profile + * output: */ + if (ehdr.e_machine == EM_ARM) { + if (!strcmp(elf_name, "$a") || + !strcmp(elf_name, "$d") || + !strcmp(elf_name, "$t")) + continue; + } + if (opdsec && sym.st_shndx == opdidx) { u32 offset = sym.st_value - opdshdr.sh_addr; u64 *opd = opddata->d_buf + offset; -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/