From 664fee3dc37939bb8010906913fa9dbc52abb587 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Wed, 17 Sep 2014 08:41:01 +0000 Subject: perf probe: Do not use dwfl_module_addrsym if dwarf_diename finds symbol name 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(-) (limited to 'tools') 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) -- cgit v1.2.3