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diff --git a/gdb/user-regs.h b/gdb/user-regs.h
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+/* Per-frame user registers, for GDB, the GNU debugger.
+
+   Copyright 2002, 2003 Free Software Foundation, Inc.
+
+   Contributed by Red Hat.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef USER_REGS_H
+#define USER_REGS_H
+
+/* Implement both builtin, and architecture specific, per-frame user
+   visible registers.
+
+   Builtin registers apply to all architectures, where as architecture
+   specific registers are present when the architecture is selected.
+
+   These registers are assigned register numbers outside the
+   architecture's register range [0 .. NUM_REGS + NUM_PSEUDO_REGS).
+   Their values should be constructed using per-frame information.  */
+
+/* TODO: cagney/2003-06-27: Need to think more about how these
+   registers are added, read, and modified.  At present they are kind
+   of assumed to be read-only.  Should it, for instance, return a
+   register descriptor that contains all the relvent access methods.  */
+
+struct frame_info;
+
+/* Given an architecture, map a user visible register name onto its
+   index.  */
+
+extern int user_reg_map_name_to_regnum (struct gdbarch *gdbarch,
+					const char *str, int len);
+
+extern const char *user_reg_map_regnum_to_name (struct gdbarch *gdbarch,
+						int regnum);
+
+/* Return the value of the frame register in the specified frame.
+
+   Note; These methods return a "struct value" instead of the raw
+   bytes as, at the time the register is being added, the type needed
+   to describe the register has not bee initialized.  */
+
+typedef struct value *(user_reg_read_ftype) (struct frame_info *frame);
+extern struct value *value_of_user_reg (int regnum, struct frame_info *frame);
+
+/* Add a builtin register (present in all architectures).  */
+extern void user_reg_add_builtin (const char *name,
+				  user_reg_read_ftype *read);
+
+/* Add a per-architecture frame register.  */
+extern void user_reg_add (struct gdbarch *gdbarch, const char *name, 
+			  user_reg_read_ftype *read);
+
+#endif