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+.\"	$NetBSD: binpatch.8,v 1.8 2009/08/24 12:55:16 tsutsui Exp $
+.\"
+.\" Copyright (c) 1994 Christian E. Hopps
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"      This product includes software developed by Christian E. Hopps.
+.\" 4. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" 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 August 20, 2009
+.Dt BINPATCH 8 atari
+.Os
+.Sh NAME
+.Nm binpatch
+.Nd "examine and or modify initialized data in an executable binary"
+.Sh SYNOPSIS
+.Nm binpatch
+.Op Fl b | Fl w | Fl l | Fl d
+.Op Fl o Ar offset
+.Op Fl T Ar saddr
+.Fl s Ar symname
+.Op Fl r Ar value
+.Ar binfile
+.Nm binpatch
+.Op Fl b | Fl w | Fl l | Fl d
+.Op Fl o Ar offset
+.Op Fl T Ar saddr
+.Fl a Ar addr
+.Op Fl r Ar value
+.Ar binfile
+.Sh DESCRIPTION
+.Nm
+is used to modify or examine the data associated with a symbol in a binary
+file
+.Ar binfile .
+.Pp
+The flags
+.Fl b ,
+.Fl w ,
+.Fl l ,
+and
+.Fl d
+specify the size of the data to be modified or examined.
+.Fl b
+is for 8bit
+.Pq Li int8_t ,
+.Fl w
+is for 16bit
+.Pq Li int16_t ,
+.Fl l
+is for 32bit
+.Pq Li int32_t ,
+and
+.Fl d
+is for 64bit
+.Pq Li int64_t
+variables.
+.Pp
+The
+.Ar binfile
+is scanned in search of the symbol
+.Ar symname
+(specified with the
+.Fl s
+flag).
+If the symbol is found the current data and address are printed.
+.Pp
+Next if the
+.Fl r
+flag has been given, the current data is replaced with that of
+.Ar value .
+.Pp
+If the second form is used the address
+.Ar addr
+specified with the
+.Fl a
+flag is used as a direct address into the data section of the binary and
+no symbol search is performed.
+.Pp
+The
+.Fl o
+flag specifies an offset in
+.Li int8_t ,
+.Li int16_t ,
+.Li int32_t ,
+and
+.Li int64_t
+.Fl ( b ,
+.Fl w ,
+.Fl l ,
+or
+.Fl d )
+units from the given locator
+.Fl ( s
+or
+.Fl a )
+for
+.Nm
+to perform its described actions.
+This might be useful to patch a member of array or structure.
+.Pp
+The
+.Fl T
+flag is used to specify the starting address of a.out binary text segment.
+Ignored for other binary executable formats.
+.Sh SEE ALSO
+.Xr gdb 1 ,
+.Xr mdsetimage 8
+.Sh BUGS
+The
+.Nm
+command doesn't check if size of specified symbol is the same as the
+specified size by
+.Fl b ,
+.Fl w ,
+.Fl l ,
+or
+.Fl d
+flag.
+.Pp
+The
+.Nm
+command doesn't check if specified address or symbol is a patchable variable
+and it might corrupt the specified executable binary.