Math Processor Unit Library

diff --git a/mpu/mpu-mtherr.h b/mpu/mpu-mtherr.h
new file mode 100644
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+++ b/mpu/mpu-mtherr.h
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+
+/***************************************************************
+  __MPU_MTHERR.H
+
+       This file contains MATH ERROR operation
+       functions & data declarations.
+
+       PART OF : MPU - library .
+
+       USAGE   : Internal only .
+
+       NOTE    : Include "libmpu.h" before this FILE .
+
+       Copyright (C) 2000 - 2024  by Andrew V.Kosteltsev.
+       All Rights Reserved.
+ ***************************************************************/
+
+#ifndef   __MPU_MTHERR_H
+#define   __MPU_MTHERR_H
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+extern void __integer_invalid_size   ( __mpu_char8_t *name );
+extern void __integer_invalid_shift  ( __mpu_char8_t *name );
+extern void __integer_invalid_number ( __mpu_char8_t *name );
+extern void __integer_invalid_radix  ( __mpu_char8_t *name );
+extern void __real_invalid_size      ( __mpu_char8_t *name );
+extern void __real_truncate_error    ( void );
+
+extern void _mtherr ( EMUSHORT      *rc,
+                      __mpu_char8_t *name,
+                      int            type,
+                      EMUSHORT      *ret_val,
+                      EMUSHORT      *arg1,
+                      EMUSHORT      *arg2,
+                      int            nb );
+
+
+#ifdef  __cplusplus
+}   /* ... extern "C" */
+#endif
+
+#endif /* __MPU_MTHERR_H */