Initial import of compiler-rt.

 -

llvm-svn: 74292

1 files changed, 57 insertions, 0 deletions

diff --git a/compiler-rt/test/Unit/enable_execute_stack_test.c b/compiler-rt/test/Unit/enable_execute_stack_test.c
new file mode 100644
index 00000000000..2e0a6c22783
--- /dev/null
+++ b/compiler-rt/test/Unit/enable_execute_stack_test.c
@@ -0,0 +1,57 @@
+//===-- enable_execute_stack_test.c - Test __enable_execute_stack ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/mman.h>
+
+
+
+extern void __clear_cache(void* start, void* end);
+extern void __enable_execute_stack(void* addr);
+
+typedef int (*pfunc)(void);
+
+int func1() 
+{
+    return 1;
+}
+
+int func2() 
+{
+    return 2;
+}
+
+
+
+
+int main()
+{
+	unsigned char execution_buffer[128];
+	// mark stack page containing execution_buffer to be executable
+	__enable_execute_stack(execution_buffer);
+	
+    // verify you can copy and execute a function
+    memcpy(execution_buffer, &func1, 128);
+    __clear_cache(execution_buffer, &execution_buffer[128]);
+    pfunc f1 = (pfunc)execution_buffer;
+    if ( (*f1)() != 1 )
+        return 1;
+
+    // verify you can overwrite a function with another
+    memcpy(execution_buffer, &func2, 128);
+    __clear_cache(execution_buffer, &execution_buffer[128]);
+    pfunc f2 = (pfunc)execution_buffer;
+    if ( (*f2)() != 2 )
+        return 1;
+
+    return 0;
+}