Add support for FT32 platform.

libgloss/ft32/crt0.S

@@ -0,0 +1,73 @@
+/* crt0.S -- startup file for FT32
+ *
+ * Copyright (c) 2015  FTDI
+ *
+ * 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.
+ */
+
+        .globl        __start
+        .weak        _start
+        .text
+        .type        __start,@function
+
+__start:
+_start:
+
+    jmp   truestart
+    jmp   truestart
+
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+    reti
+
+truestart:
+        ldk.l   $sp, 0xfffc        /* set the top of stack */
+        ldk.l   $fp,0           /* zero fp to allow unwinders to stop */
+
+        /* Set argc and argv to zero */
+        ldk.l        $r0, 0
+        ldk.l        $r1, 0
+
+        sub.l   $sp,$sp,24    # room for the args to main
+        call        main
+        call        exit
+
+.Lend:
+        .size        __start,(.Lend-__start)