+/* A pointer to a function that should return non-zero iff REGNUM
+ corresponds to one of the segment registers. */
+typedef int (segment_register_p_ftype) (int regnum);
+
+/* segment_register_p_ftype implementation for x86. */
+int i386_windows_segment_register_p (int regnum);
+
+/* context register offests for x86. */
+extern const int i386_mappings[];
+
+#ifdef __x86_64__
+/* segment_register_p_ftype implementation for amd64. */
+int amd64_windows_segment_register_p (int regnum);
+
+/* context register offests for amd64. */
+extern const int amd64_mappings[];
+#endif