Import libcompiler_rt into HEAD and add Makefiles.

Obtained from:	user/ed/compiler-rt

1 files changed, 41 insertions, 0 deletions

diff --git a/contrib/compiler-rt/lib/clear_cache.c b/contrib/compiler-rt/lib/clear_cache.c
new file mode 100644
index 0000000..43db37a
--- /dev/null
+++ b/contrib/compiler-rt/lib/clear_cache.c
@@ -0,0 +1,41 @@
+/* ===-- clear_cache.c - Implement __clear_cache ---------------------------===
+ *
+ *                     The LLVM Compiler Infrastructure
+ *
+ * This file is distributed under the University of Illinois Open Source
+ * License. See LICENSE.TXT for details.
+ *
+ * ===----------------------------------------------------------------------===
+ */
+
+#include "int_lib.h"
+#include <stdlib.h>
+
+#if __APPLE__
+  #include <libkern/OSCacheControl.h>
+#endif
+
+/*
+ * The compiler generates calls to __clear_cache() when creating 
+ * trampoline functions on the stack for use with nested functions.
+ * It is expected to invalidate the instruction cache for the 
+ * specified range.
+ */
+
+void __clear_cache(void* start, void* end)
+{
+#if __i386__ || __x86_64__
+/*
+ * Intel processors have a unified instruction and data cache
+ * so there is nothing to do
+ */
+#else
+    #if __APPLE__
+        /* On Darwin, sys_icache_invalidate() provides this functionality */
+        sys_icache_invalidate(start, end-start);
+    #else
+        compilerrt_abort();
+    #endif
+#endif
+}
+