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+.\"	$NetBSD: ddb.9,v 1.3 2020/10/31 10:48:17 wiz Exp $
+.\"
+.\" Copyright (c) 2020 Valery Ushakov
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd October 30, 2020
+.Dt DDB 9
+.Os
+.\"
+.\"
+.Sh NAME
+.Nm ddb
+.Nd in-kernel debugger
+.\"
+.\"
+.Sh SYNOPSIS
+.\"
+.In ddb/ddb.h
+.\"
+.Ft int
+.Fn db_register_tbl "uint8_t type" "const struct db_command *commands"
+.\"
+.Ft int
+.Fn db_unregister_tbl "uint8_t type" "const struct db_command *commands"
+.\"
+.\" XXX: there's no typedef defined for this
+.Ft void
+.Fo "(*pf)" \" it seems there's no way to format this differently
+.Fa "db_expr_t addr"
+.Fa "bool have_addr"
+.Fa "db_expr_t count"
+.Fa "const char *modif"
+.Fc
+.\"
+.\" - a macro, but document the types here
+.Fo DDB_ADD_CMD
+.Fa "const char *name"
+.Fa "void (*pf)(db_expr_t, bool, db_expr_t, const char *)"
+.Fa "uint16_t flags"
+.Fa "const char *cmd_descr"
+.Fa "const char *cmd_arg"
+.Fa "const char *arg_desc"
+.Fc
+.\"
+.Sh DESCRIPTION
+Devices and kernel modules can add new commands to the
+.Xr ddb 4
+in-kernel debugger with
+.Fn db_register_tbl
+and remove previously added commands with
+.Fn db_unregister_tbl
+respectively.
+.Pp
+The
+.Fa type
+argument is one of:
+.Bl -tag -offset indent -width Dv
+.\"
+.It Dv DDB_BASE_CMD
+top-level commands;
+.\"
+.It Dv DDB_MACH_CMD
+sub-commands of the top-level
+.Ic mach
+command;
+.\"
+.It Dv DDB_SHOW_CMD
+sub-commands of the top-level
+.Ic show
+command.
+.\"
+.El
+.\"
+.Pp
+The
+.Fa commands
+argument is an array of
+.Vt struct db_command\|
+entries.
+The initializer list for the array should use the
+.Fn DDB_ADD_CMD
+macro for its entries.
+The
+.Fa name
+argument is the name of the debugger command.
+An entry with
+.Dv NULL
+.Fa name
+terminates the array.
+.Pp
+The
+.Fa pf
+argument is the function that implements the command.
+The debugger's
+.Tn REPL
+parses the usual command format documented in
+.Xr ddb 4
+and invokes the implementation with the values obtained.
+.Pp
+The
+.Fa flags
+argument is a bitwise
+.Tn OR
+of the following values:
+.Bl -tag -offset indent -width Dv
+.\"
+.It Dv CS_MORE
+The command takes the usual arguments but may additionally parse the
+remainder of its command line.
+.\"
+.It Dv CS_NOREPEAT
+The command should not be automatically repeated by the
+.Tn REPL
+when the user enters an empty command after it.
+.\"
+.It Dv CS_OWN
+The command doesn't follow the normal
+.Xr ddb 4
+conventions and parses its command line itself.
+The
+.Tn REPL
+doesn't try to parse the command line.
+The values passed to its implementation are dummies.
+.\"
+.It Dv CS_SET_DOT
+The command sets the
+.Va dot .
+.\"
+.El
+.\"
+.Pp
+The remaining parameters are strings that provide documentation for
+the command and its arguments.
+That documentation is available to the user via the
+.Ic help
+command if the kernel was compiled with the
+.Dv DDB_VERBOSE_HELP
+option.
+.\"
+.Sh SEE ALSO
+.Xr ddb 4