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perf probe: Do not use dwfl_module_addrsym if dwarf_diename finds symbol name

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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
          @<create_arg_op+0>
                  enum filter_op_type     btype
                  struct filter_arg*      arg
  ----

This bug was reported on [email protected].

Reported-by: david lerner <[email protected]>
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: david lerner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Link: http://permalink.gmane.org/gmane.linux.kernel.perf.user/1691
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Masami Hiramatsu authored and Arnaldo Carvalho de Melo committed 2014-09-17 18:01:43 -03:00
1 parent 2b394bc446
commit 664fee3dc3
1 file changed
+10 -6
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tools/perf/util/probe-finder.c
+10 -6
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@@ -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)