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-.\" Copyright (c) 2000 Brian S. Dean
-.\" All rights reserved.
-.\"
-.\" This man-page is based on a similar man-page by Jonathan Lemon
-.\" which is copyrighted under the following conditions:
-.\"
-.\" 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd August 24, 2000
-.Os
-.Dt I386_SET_WATCH 3
-.Sh NAME
-.Nm i386_clr_watch ,
-.Nm i386_set_watch
-.Nd manage i386 debug register values
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.Fd #include <machine/reg.h>
-.Fd #include <machine/sysarch.h>
-.Ft int
-.Fn i386_clr_watch "int watchnum" "struct dbreg *d"
-.Ft int
-.Fn i386_set_watch "int watchnum" "unsigned int watchaddr" "int size" "int access" "struct dbreg *d"
-.Sh DESCRIPTION
-.Fn i386_clr_watch
-will disable the indicated watch point within the specified debug
-register set.
-.Pp
-.Fn i386_set_watch
-will set up the specified debug registers as indicated by the
-parameters.  The
-.Fa watchnum
-argument specifies which watch register is used, 0, 1, 2, 3, or -1.  If
-.Fa watchnum
-is -1, a free watch register is found and used.  If there are no free
-watch registers, an error code of -1 is returned.  
-.Fa Watchaddr
-specifies the watch address, 
-.Fa size
-specifies the size in bytes of the area to be watched (1, 2, or 4 bytes),
-and
-.Fa access
-specifes the type of watch point:
-.Pp
-.Bd -literal -offset indent -compact
-DBREG_DR7_EXEC	  An execution breakpoint.
-DBREG_DR7_WRONLY  Break only when the watch area is written to.
-DBREG_DR7_RDWR	  Break when the watch area is read from or written
-                  to.
-.Ed
-.Pp
-Note that these functions do not actually set or clear breakpoints;
-they manipulate the indicated debug register set.  You must use
-.Xr ptrace 2
-to retrieve and install the debug register values for a process.
-.Sh RETURN VALUES
-.Fn i386_clr_watch
-returns 0 on success, or -1 if
-.Fa watchnum
-is invalid (not in the range of 0-3).
-.Pp
-.Fn i386_set_watch
-will return the
-.Fa watchnum
-argument, or the watchnum actually used in the case that
-.Fa watchnum
-is -1 on success.  On error,
-.Fn i386_set_watch
-will return -1 indicating that the watchpoint could not be set up
-because either no more watchpoints are available, or
-.Fa watchnum ,
-.Fa size ,
-or
-.Fa access
-is invalid.
-.Sh SEE ALSO
-.Xr ptrace 2 ,
-.Xr procfs 5
-.Sh AUTHORS
-This man page was written by
-.An Brian S. Dean .