sanitizer_stacktrace.cc (GetCanonicFrame): Assume we compiled code with GCC when…

sanitizer_stacktrace.cc (GetCanonicFrame): Assume we compiled code with GCC when extracting the caller PC for ARM if...

libsanitizer/

	* sanitizer_common/sanitizer_stacktrace.cc (GetCanonicFrame): Assume we
	compiled code with GCC when extracting the caller PC for ARM if no
	valid frame pointer is available.

From-SVN: r241980

libsanitizer/ChangeLog

 2016-11-09  Maxim Ostapenko  <m.ostapenko@samsung.com>
 
+	* sanitizer_common/sanitizer_stacktrace.cc (GetCanonicFrame): Assume we
+	compiled code with GCC when extracting the caller PC for ARM if no
+	valid frame pointer is available.
+
+2016-11-09  Maxim Ostapenko  <m.ostapenko@samsung.com>
+
 	PR sanitizer/63958
 	Reapply:
 	2014-10-14  David S. Miller  <davem@davemloft.net>

libsanitizer/sanitizer_common/sanitizer_stacktrace.cc

@@ -55,8 +55,8 @@ static inline uhwptr *GetCanonicFrame(uptr bp,
   // Nope, this does not look right either. This means the frame after next does
   // not have a valid frame pointer, but we can still extract the caller PC.
   // Unfortunately, there is no way to decide between GCC and LLVM frame
-  // layouts. Assume LLVM.
-  return bp_prev;
+  // layouts. Assume GCC.
+  return bp_prev - 1;
 #else
   return (uhwptr*)bp;
 #endif