-extern const char * cgen_read_cpu_file
- PARAMS ((CGEN_CPU_DESC, const char * filename_));
+extern const char * cgen_read_cpu_file (CGEN_CPU_DESC, const char * filename_);
+
+/* Allow signed overflow of instruction fields. */
+extern void cgen_set_signed_overflow_ok (CGEN_CPU_DESC);
+
+/* Generate an error message if a signed field in an instruction overflows. */
+extern void cgen_clear_signed_overflow_ok (CGEN_CPU_DESC);
+
+/* Will an error message be generated if a signed field in an instruction overflows ? */
+extern unsigned int cgen_signed_overflow_ok_p (CGEN_CPU_DESC);
+
+#ifdef __cplusplus
+}
+#endif