extern int gdbarch_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, int dwarf2_regnr);
extern void set_gdbarch_dwarf2_reg_to_regnum (struct gdbarch *gdbarch, gdbarch_dwarf2_reg_to_regnum_ftype *dwarf2_reg_to_regnum);
-typedef const char * (gdbarch_register_name_ftype) (int regnr);
+typedef const char * (gdbarch_register_name_ftype) (struct gdbarch *gdbarch, int regnr);
extern const char * gdbarch_register_name (struct gdbarch *gdbarch, int regnr);
extern void set_gdbarch_register_name (struct gdbarch *gdbarch, gdbarch_register_name_ftype *register_name);