[fsbl] add fsbl for cv181x/cv180x

Change-Id: I6809bc5016d4bc148f62be2ed3f8e928ec111f19

fsbl/lib/libtommath/bn_error.c

@@ -0,0 +1,44 @@
+#include "tommath_private.h"
+#ifdef BN_ERROR_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
+static const struct {
+   int code;
+   const char *msg;
+} msgs[] = {
+   { MP_OKAY, "Successful" },
+   { MP_MEM,  "Out of heap" },
+   { MP_VAL,  "Value out of range" }
+};
+
+/* return a char * string for a given code */
+const char *mp_error_to_string(int code)
+{
+   size_t x;
+
+   /* scan the lookup table for the given message */
+   for (x = 0; x < (sizeof(msgs) / sizeof(msgs[0])); x++) {
+      if (msgs[x].code == code) {
+         return msgs[x].msg;
+      }
+   }
+
+   /* generic reply for invalid code */
+   return "Invalid error code";
+}
+
+#endif
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */