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Utility to control the printing of "Fixed up unaligned data access for pid

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nnn at pc 0xADDR" and the fixup of the UA fault on the DEC Alpha when an
unaligned access fault happens.  Modeled after the OSF/1 utility of the
same name.

Submitted by:	gallatin
This commit is contained in:
David E. O'Brien 2000-01-19 09:47:19 +00:00
parent 6e5d660a63
commit bcbd27be2a
4 changed files with 233 additions and 0 deletions
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4
usr.bin/Makefile
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@ -224,4 +224,8 @@ SUBDIR+=ar \
strip
.endif
.if ${MACHINE_ARCH} == "alpha"
SUBDIR+=uac
.endif
.include <bsd.subdir.mk>

5
usr.bin/uac/Makefile Normal file
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@ -0,0 +1,5 @@
# $FreeBSD$
PROG= uac
.include <bsd.prog.mk>

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usr.bin/uac/uac.1 Normal file
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.\" Copyright (c) 2000 David E. O'Brien
.\" 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 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 January 18, 2000
.Dt UAC 1
.Os
.Sh NAME
.Nm uac
.Nd Unaligned Access Message Control
.Sh SYNOPSIS
.Nm uac
.Op Fl fprs
.Sh DESCRIPTION
.Nm
sets the per-process handling of "Unaligned Access" events. Unlike many
other CPU's the DEC Alpha processor cannot access unaligned data. To work
around this, the Alpha has the ability to fix the UA fault rather than send
the faulting process a SIGBUS signal. However, doing so does slow down the
execution of the faulting process.
At boot up, the DEC Alpha CPU defaults to printing "Fixed up unaligned data
access for pid nnn at pc 0xADDR" when a UA happens along with fixing it so
the faulting instruction can continue.
UA handling settings are inherited by child process.
Issued with out any options,
.Mn
displays the current UA handling for the parent process.
.Pp
The options are as follows:
.Bl -tag -width Fl
.It Fl f
Unaligned access errors are not fixed for the parent and its future descendants.
.It Fl p
Unaligned access errors are not printed for the parent and its future
descendants.
.It Fl r
Resets the unaligned access error settings back to their bootup defaults.
.It Fl s
Unaligned access errors result in a SIGBUS being delivered to the parent and
its future descendants. This aid in pin pointing the faulting access so it
debugged.
.El
.Sh DIAGNOSTICS
Exit status is 0 on success, and 1 if the command
fails for any reason.
.El
.Sh COMPATIBILITY
The
.Nm
command syntax is incompatible with the DEC OSF/1 syntax.
.Sh SEE ALSO
.Xr signal 3
.Sh HISTORY
.Nm
first appeared in DEC OSF/1.
.Pp
.Sh AUTHORS
The
.Fx
version of
.Nm
was originally written by
.An Andrew Gallatin Aq gallatin@cs.duke.edu
and modified by
.An David E. O'Brien Aq obrien@FreeBSD.org .
This
manual page was written by
.An David E. O'Brien Aq obrien@FreeBSD.org .

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usr.bin/uac/uac.c Normal file
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/*
* Copyright (c) 2000 Andrew Gallatin and David E. O'Brien
* 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
* in this position and unchanged.
* 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. The name of the author may not be used to endorse or promote products
* derived from this software withough 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.
*
* $FreeBSD$
*/
#include <sys/types.h>
#include <machine/sysarch.h>
#include <machine/proc.h>
#include <stdio.h>
#include <unistd.h>
#include <err.h>
extern int sysarch(int, char *);
static void usage ();
struct parms {
u_int64_t uac;
};
int
alpha_setuac(u_int64_t uac)
{
struct parms p;
p.uac = uac;
return (sysarch(ALPHA_SET_UAC, (char *)&p));
}
int
alpha_getuac(u_int64_t *uac)
{
struct parms p;
int error;
error = sysarch(ALPHA_GET_UAC, (char *)&p);
*uac = p.uac;
return (error);
}
static void
print_uac(u_int64_t uac)
{
printf("parent printing is ");
if (uac & MDP_UAC_NOPRINT)
printf("off\n");
else
printf("on\n");
printf("parent fixup is ");
if (uac & MDP_UAC_NOFIX)
printf("off\n");
else
printf("on\n");
printf("parent sigbus is ");
if (uac & MDP_UAC_SIGBUS)
printf("on \n");
else
printf("off\n");
}
int
main(argc, argv)
int argc;
char **argv;
{
int c;
u_int64_t uac;
if (alpha_getuac(&uac) != 0)
err(1, NULL);
while ((c = getopt(argc, argv, "fpsr")) != -1) {
switch (c) {
case 'f':
uac |= MDP_UAC_NOFIX;
break;
case 'p':
uac |= MDP_UAC_NOPRINT;
break;
case 's':
uac |= MDP_UAC_SIGBUS;
break;
case 'r':
uac = 0;
break;
default:
usage();
/* NOTREACHED */
}
}
if (argc != 1) {
if (alpha_setuac(uac) != 0)
err(1, NULL);
}
print_uac(uac);
return 0;
}
static void
usage ()
{
fprintf(stderr, "usage: uac [-fprs]\n");
}