usr/src/sys/miscfs/procfs/procfs_fpregs.c

/*
 * Copyright (c) 1993 Jan-Simon Pendry
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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 the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 *
 *      @(#)procfs_fpregs.c     8.1 (Berkeley) 1/27/94
 *
 * From:
 *      $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <machine/reg.h>
#include <miscfs/procfs/procfs.h>

int
procfs_dofpregs(curp, p, pfs, uio)
        struct proc *curp;
        struct proc *p;
        struct pfsnode *pfs;
        struct uio *uio;
{
        int error;
        struct fpreg r;
        char *kv;
        int kl;

        kl = sizeof(r);
        kv = (char *) &r;

        kv += uio->uio_offset;
        kl -= uio->uio_offset;
        if (kl > uio->uio_resid)
                kl = uio->uio_resid;

        if (kl < 0)
                error = EINVAL;
        else
                error = procfs_read_fpregs(p, &r);
        if (error == 0)
                error = uiomove(kv, kl, uio);
        if (error == 0 && uio->uio_rw == UIO_WRITE) {
                if (p->p_stat != SSTOP)
                        error = EBUSY;
                else
                        error = procfs_write_fpregs(p, &r);
        }

        uio->uio_offset = 0;
        return (error);
}