procfs_regs.c revision 1541 
19Sjkh/*
29Sjkh * Copyright (c) 1993 Jan-Simon Pendry
39Sjkh * Copyright (c) 1993
411891Speter *	The Regents of the University of California.  All rights reserved.
59Sjkh *
69Sjkh * This code is derived from software contributed to Berkeley by
79Sjkh * Jan-Simon Pendry.
89Sjkh *
99Sjkh * Redistribution and use in source and binary forms, with or without
109Sjkh * modification, are permitted provided that the following conditions
119Sjkh * are met:
129Sjkh * 1. Redistributions of source code must retain the above copyright
139Sjkh *    notice, this list of conditions and the following disclaimer.
149Sjkh * 2. Redistributions in binary form must reproduce the above copyright
159Sjkh *    notice, this list of conditions and the following disclaimer in the
169Sjkh *    documentation and/or other materials provided with the distribution.
179Sjkh * 3. All advertising materials mentioning features or use of this software
189Sjkh *    must display the following acknowledgement:
199Sjkh *	This product includes software developed by the University of
2011891Speter *	California, Berkeley and its contributors.
2111891Speter * 4. Neither the name of the University nor the names of its contributors
2211891Speter *    may be used to endorse or promote products derived from this software
239Sjkh *    without specific prior written permission.
249Sjkh *
259Sjkh * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
269Sjkh * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
279Sjkh * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
289Sjkh * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
299Sjkh * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
309Sjkh * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
319Sjkh * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3250472Speter * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
339Sjkh * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
349Sjkh * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
359Sjkh * SUCH DAMAGE.
369Sjkh *
379Sjkh *	@(#)procfs_regs.c	8.3 (Berkeley) 1/27/94
389Sjkh *
399Sjkh * From:
409Sjkh *	$Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
419Sjkh */
429Sjkh
439Sjkh#include <sys/param.h>
449Sjkh#include <sys/systm.h>
459Sjkh#include <sys/time.h>
469Sjkh#include <sys/kernel.h>
479Sjkh#include <sys/proc.h>
489Sjkh#include <sys/vnode.h>
499Sjkh#include <machine/reg.h>
509Sjkh#include <miscfs/procfs/procfs.h>
519Sjkh
529Sjkhint
539Sjkhprocfs_doregs(curp, p, pfs, uio)
549Sjkh	struct proc *curp;
559Sjkh	struct proc *p;
569Sjkh	struct pfsnode *pfs;
579Sjkh	struct uio *uio;
589Sjkh{
599Sjkh	int error;
609Sjkh	struct reg r;
619Sjkh	char *kv;
629Sjkh	int kl;
639Sjkh
649Sjkh	kl = sizeof(r);
659Sjkh	kv = (char *) &r;
669Sjkh
679Sjkh	kv += uio->uio_offset;
689Sjkh	kl -= uio->uio_offset;
699Sjkh	if (kl > uio->uio_resid)
70		kl = uio->uio_resid;
71
72	if (kl < 0)
73		error = EINVAL;
74	else
75		error = procfs_read_regs(p, &r);
76	if (error == 0)
77		error = uiomove(kv, kl, uio);
78	if (error == 0 && uio->uio_rw == UIO_WRITE) {
79		if (p->p_stat != SSTOP)
80			error = EBUSY;
81		else
82			error = procfs_write_regs(p, &r);
83	}
84
85	uio->uio_offset = 0;
86	return (error);
87}
88