sparc: Provide _CPU_Get_thread_executing()

cpukit/score/cpu/sparc/rtems/score/cpuimpl.h

@@ -5,6 +5,8 @@
  */
 
 /*
+ * Copyright (c) 2016 embedded brains GmbH.
+ *
  * The license and distribution terms for this file may be
  * found in the file LICENSE in this distribution or at
  * http://www.rtems.org/license/LICENSE.
@@ -21,6 +23,8 @@
 extern "C" {
 #endif
 
+#define _CPU_Get_thread_executing() ( _SPARC_Per_CPU_current->executing )
+
 #ifdef __cplusplus
 }
 #endif