Add support for FT32 platform.

libgloss/ft32/sbrk.c

@@ -0,0 +1,45 @@
+/* sbrk.c -- allocate memory dynamically.
+ *
+ *
+ * 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 <errno.h>
+#include "glue.h"
+
+char *__heap_ptr = (char *)&_end;
+
+/*
+ * sbrk -- changes heap size size. Get nbytes more
+ *         RAM. We just increment a pointer in what's
+ *         left of memory on the board.
+ */
+char *
+_sbrk (nbytes)
+     int nbytes;
+{
+  char *base;
+  char *sp;
+  char canary;
+
+  if ((__heap_ptr + nbytes) < (&canary - 2000))
+    {
+      base = __heap_ptr;
+      __heap_ptr += nbytes;
+      return base;
+    }
+    else
+    {
+      errno = ENOMEM;
+      return ((char *)-1);
+    }
+}