Implement KeGetTrapFrame and KeGetExceptionFrame macros.

svn path=/branches/ros-amd64-bringup/; revision=44773

reactos/ntoskrnl/include/internal/amd64/ke.h

@@ -102,6 +102,17 @@ extern ULONG KeI386CpuStep;
 #define KeSetContextReturnRegister(Context, ReturnValue) \
     ((Context)->Rax = (ReturnValue))
 
+//
+// Macro to get trap and exception frame from a thread stack
+//
+#define KeGetTrapFrame(Thread) \
+    (PKTRAP_FRAME)((ULONG_PTR)((Thread)->InitialStack) - \
+                   sizeof(KTRAP_FRAME))
+
+#define KeGetExceptionFrame(Thread) \
+    (PKEXCEPTION_FRAME)((ULONG_PTR)KeGetTrapFrame(Thread) - \
+                        sizeof(KEXCEPTION_FRAME))
+
 //
 // Returns the Interrupt State from a Trap Frame.
 // ON = TRUE, OFF = FALSE