Add support for FT32 platform.

libgloss/ft32/sim-open.S

@@ -0,0 +1,39 @@
+/*
+ * sim-open.S -- open interface for FT32 simulator
+ *
+ * Copyright (C) 2015 FTDI (support@ftdichip.com)
+ *
+ * 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.
+ */
+
+#include "syscall.h"
+
+/*
+ * Input:
+ * $r0            -- File name to open.
+ * $r1      -- open mode.
+ * -0x12($fp) -- optionally, the permission bits to set the file to.
+ *
+ * Output:
+ * $r0          -- file descriptor or -1.
+ * errno  -- Set if an error
+ */
+
+        .globl        _open
+        .type        _open,@function
+        .weak        open
+        .text
+_open:
+open:
+        # swi        SYS_open
+        return
+.Lend:
+        .size        _open,.Lend-_open