merge in netbsd changes.

[unix-history] / usr / src / sys / miscfs / procfs / procfs_regs.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.
*
* %sccs.include.redist.c%
*
*      @(#)procfs_regs.c       8.4 (Berkeley) %G%
*
* 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_doregs(curp, p, pfs, uio)
       struct proc *curp;
       struct proc *p;
       struct pfsnode *pfs;
       struct uio *uio;
{
       int error;
       struct reg 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_regs(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_regs(p, &r);
       }

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

int
procfs_validregs(p)
       struct proc *p;
{

       return ((p->p_flag & P_SYSTEM) == 0);
}