Fix Issue #5542 (#5827)

On arm32, NullReference exception for interface call is not handled
properly. Especially, when callsite is a virtualstub(dispatch/resolve), AV exception
occurs on indirect cell. Since this stub is not a part of
managed or markedjithelper, exception handler considers this is a native
seg fault.
I added :
(1) FaultingExceptionFrame construction routine for virtualstub
(2) Checking and IP-adjusting routine for VirtualStub

1 files changed, 32 insertions, 0 deletions

diff --git a/src/vm/arm/exceparm.cpp b/src/vm/arm/exceparm.cpp
index 9b14d41c83..6852adcc33 100644
--- a/src/vm/arm/exceparm.cpp
+++ b/src/vm/arm/exceparm.cpp
@@ -54,6 +54,38 @@ FaultingExceptionFrame *GetFrameFromRedirectedStubStackFrame (T_DISPATCHER_CONTE
     return (FaultingExceptionFrame*)((TADDR)pDispatcherContext->ContextRecord->R4);
 }
 
+//Return TRUE if pContext->Pc is in VirtualStub
+BOOL IsIPinVirtualStub(PCODE f_IP)
+{
+    LIMITED_METHOD_CONTRACT;
+
+    Thread * pThread = GetThread();
+
+    // We may not have a managed thread object. Example is an AV on the helper thread.
+    // (perhaps during StubManager::IsStub)
+    if (pThread == NULL)
+    {
+        return FALSE;
+    }
+
+    VirtualCallStubManager::StubKind sk;
+    VirtualCallStubManager::FindStubManager(f_IP, &sk);
+
+    if (sk == VirtualCallStubManager::SK_DISPATCH)
+    {
+        return TRUE;
+    }
+    else if (sk == VirtualCallStubManager::SK_RESOLVE)
+    {
+        return TRUE;
+    }
+
+    else {
+        return FALSE;
+    }
+}
+
+
 // Returns TRUE if caller should resume execution.
 BOOL
 AdjustContextForVirtualStub(