Add ARC support

This adds support for the ARC architecture to libffi. DesignWare ARC
is a family of processors from Synopsys, Inc.

This patch has been tested on a little-endian system and passes
the testsuite.

Signed-off-by: Mischa Jonker <mjonker@synopsys.com>

src/arc/ffitarget.h

@@ -0,0 +1,53 @@
+/* -----------------------------------------------------------------------
+   ffitarget.h - Copyright (c) 2012  Anthony Green
+                 Copyright (c) 2013  Synopsys, Inc. (www.synopsys.com)
+   Target configuration macros for ARC.
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   ``Software''), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be included
+   in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
+   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+   IN NO EVENT SHALL RENESAS TECHNOLOGY BE LIABLE FOR ANY CLAIM, DAMAGES OR
+   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+   OTHER DEALINGS IN THE SOFTWARE.
+
+   ----------------------------------------------------------------------- */
+
+#ifndef LIBFFI_TARGET_H
+#define LIBFFI_TARGET_H
+
+#ifndef LIBFFI_H
+#error "Please do not include ffitarget.h directly into your source.  Use ffi.h instead."
+#endif
+
+/* ---- Generic type definitions ----------------------------------------- */
+
+#ifndef LIBFFI_ASM
+typedef unsigned long ffi_arg;
+typedef signed long ffi_sarg;
+
+typedef enum ffi_abi
+{
+  FFI_FIRST_ABI = 0,
+  FFI_ARCOMPACT,
+  FFI_LAST_ABI,
+  FFI_DEFAULT_ABI = FFI_ARCOMPACT
+} ffi_abi;
+#endif
+
+#define FFI_CLOSURES 		1
+#define FFI_TRAMPOLINE_SIZE	12
+#define FFI_NATIVE_RAW_API 	0
+
+#endif