Add BSP and semihosting library for nios2-generic-nommu QEMU emulation.

libgloss/nios2/io-exit.c

@@ -0,0 +1,30 @@
+/*
+ * io-exit.c -- 
+ *
+ * Copyright (c) 2006 CodeSourcery Inc
+ * Copyright (c) 2018 Mentor Graphics
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#if HOSTED
+#include "io.h"
+
+/* 
+ * _exit -- Exit from the application.  
+ */
+
+void __attribute__ ((noreturn)) _exit (int code)
+{
+  while (1)
+    __io_hosted (HOSTED_EXIT, (void *)code);
+}
+#endif