2000-09-21 17:07:27 +00:00
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.\" Copyright (c) 2000 Brian S. Dean
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.\" All rights reserved.
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.\"
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.\" This man-page is based on a similar man-page by Jonathan Lemon
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.\" which is copyrighted under the following conditions:
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 24, 2000
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.Os
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.Dt I386_SET_WATCH 3
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.Sh NAME
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.Nm i386_clr_watch ,
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.Nm i386_set_watch
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.Nd manage i386 debug register values
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.Fd #include <machine/reg.h>
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.Fd #include <machine/sysarch.h>
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.Ft int
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.Fn i386_clr_watch "int watchnum" "struct dbreg *d"
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.Ft int
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.Fn i386_set_watch "int watchnum" "unsigned int watchaddr" "int size" "int access" "struct dbreg *d"
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.Sh DESCRIPTION
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.Fn i386_clr_watch
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will disable the indicated watch point within the specified debug
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register set.
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.Pp
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.Fn i386_set_watch
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will set up the specified debug registers as indicated by the
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parameters. The
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.Fa watchnum
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argument specifies which watch register is used, 0, 1, 2, 3, or -1. If
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.Fa watchnum
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is -1, a free watch register is found and used. If there are no free
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2001-07-15 07:53:42 +00:00
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watch registers, an error code of -1 is returned.
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.Fa Watchaddr
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specifies the watch address,
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.Fa size
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specifies the size in bytes of the area to be watched (1, 2, or 4 bytes),
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and
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.Fa access
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specifes the type of watch point:
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.Pp
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.Bd -literal -offset indent -compact
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DBREG_DR7_EXEC An execution breakpoint.
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DBREG_DR7_WRONLY Break only when the watch area is written to.
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DBREG_DR7_RDWR Break when the watch area is read from or written
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to.
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.Ed
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.Pp
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Note that these functions do not actually set or clear breakpoints;
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they manipulate the indicated debug register set. You must use
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.Xr ptrace 2
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to retrieve and install the debug register values for a process.
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.Sh RETURN VALUES
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.Fn i386_clr_watch
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returns 0 on success, or -1 if
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.Fa watchnum
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is invalid (not in the range of 0-3).
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.Pp
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.Fn i386_set_watch
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will return the
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.Fa watchnum
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argument, or the watchnum actually used in the case that
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.Fa watchnum
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is -1 on success. On error,
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.Fn i386_set_watch
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will return -1 indicating that the watchpoint could not be set up
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because either no more watchpoints are available, or
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.Fa watchnum ,
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.Fa size ,
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or
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.Fa access
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is invalid.
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.Sh SEE ALSO
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.Xr ptrace 2 ,
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.Xr procfs 5
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.Sh AUTHORS
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This man page was written by
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.An Brian S. Dean .
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