From 46f120ca7bc8b4a49c0d5a596b85aeca4a254698 Mon Sep 17 00:00:00 2001
From: Ian Lance Taylor <ian@gcc.gnu.org>
Date: Fri, 17 Apr 2015 21:59:10 +0000
Subject: [PATCH] re PR go/65798 (runtime.Caller returns ok=true when return
 data is invalid)

	PR go/65798
runtime: In Caller don't return ok == true if PC == 0.

GCC PR 65798 reports that this can happen in some cases.

From-SVN: r222204
---
 libgo/runtime/go-caller.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libgo/runtime/go-caller.c b/libgo/runtime/go-caller.c
index ad151ecea8e..ed6fd107b0e 100644
--- a/libgo/runtime/go-caller.c
+++ b/libgo/runtime/go-caller.c
@@ -166,7 +166,7 @@ Caller (int skip)
 
   runtime_memclr (&ret, sizeof ret);
   n = runtime_callers (skip + 1, &loc, 1, false);
-  if (n < 1)
+  if (n < 1 || loc.pc == 0)
     return ret;
   ret.pc = loc.pc;
   ret.file = loc.filename;