From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757217AbaIQVZw (ORCPT ); Wed, 17 Sep 2014 17:25:52 -0400 Received: from mail.kernel.org ([198.145.19.201]:58305 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932249AbaIQVZt (ORCPT ); Wed, 17 Sep 2014 17:25:49 -0400 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Masami Hiramatsu , david lerner , linux-perf-user@vger.kernel.org, yrl.pp-manager.tt@hitachi.com, Arnaldo Carvalho de Melo Subject: [PATCH 19/20] perf probe: Do not use dwfl_module_addrsym if dwarf_diename finds symbol name Date: Wed, 17 Sep 2014 18:24:22 -0300 Message-Id: <1410989063-14207-20-git-send-email-acme@kernel.org> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1410989063-14207-1-git-send-email-acme@kernel.org> References: <1410989063-14207-1-git-send-email-acme@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu Do not use dwfl_module_addrsym if dwarf_diename can find the symbol name, since dwfl_module_addrsym can be failed on shared libraries. Without this patch ---- $ perf probe -x ../lib/traceevent/libtraceevent.so -V create_arg_op Failed to find symbol at 0x11df1 Failed to find the address of create_arg_op Error: Failed to show vars. ---- With this patch ---- $ perf probe -x ../lib/traceevent/libtraceevent.so -V create_arg_op Available variables at create_arg_op @ enum filter_op_type btype struct filter_arg* arg ---- This bug was reported on linux-perf-users@vger.kernel.org. Reported-by: david lerner Signed-off-by: Masami Hiramatsu Cc: david lerner Cc: linux-perf-user@vger.kernel.org Cc: yrl.pp-manager.tt@hitachi.com Link: http://permalink.gmane.org/gmane.linux.kernel.perf.user/1691 Link: http://lkml.kernel.org/r/20140917084101.3722.25299.stgit@kbuild-f20.novalocal Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/probe-finder.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 9c593561aa71..c7918f83b300 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -609,14 +609,18 @@ static int convert_to_trace_point(Dwarf_Die *sp_die, Dwfl_Module *mod, return -EINVAL; } - /* Get an appropriate symbol from symtab */ - symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); + symbol = dwarf_diename(sp_die); if (!symbol) { - pr_warning("Failed to find symbol at 0x%lx\n", - (unsigned long)paddr); - return -ENOENT; + /* Try to get the symbol name from symtab */ + symbol = dwfl_module_addrsym(mod, paddr, &sym, NULL); + if (!symbol) { + pr_warning("Failed to find symbol at 0x%lx\n", + (unsigned long)paddr); + return -ENOENT; + } + eaddr = sym.st_value; } - tp->offset = (unsigned long)(paddr - sym.st_value); + tp->offset = (unsigned long)(paddr - eaddr); tp->address = (unsigned long)paddr; tp->symbol = strdup(symbol); if (!tp->symbol) -- 1.9.3