sys/vfs/procfs/procfs_fpregs.c

   1 /*
   2  * Copyright (c) 1993 Jan-Simon Pendry
   3  * Copyright (c) 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Jan-Simon Pendry.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)procfs_fpregs.c     8.2 (Berkeley) 6/15/94
  34  *
  35  * From:
  36  * $FreeBSD: src/sys/miscfs/procfs/procfs_fpregs.c,v 1.11.2.3 2002/01/22 17:22:59 nectar Exp $
  37  * $DragonFly: src/sys/vfs/procfs/procfs_fpregs.c,v 1.10 2007/02/19 01:14:24 corecode Exp $
  38  */
  39
  40 #include <sys/param.h>
  41 #include <sys/proc.h>
  42 #include <sys/priv.h>
  43 #include <sys/vnode.h>
  44 #include <sys/reg.h>
  45 #include <vfs/procfs/procfs.h>
  46 #include <vm/vm.h>
  47
  48 int
  49 procfs_dofpregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
  50                 struct uio *uio)
  51 {
  52         struct proc *p = lp->lwp_proc;
  53         int error;
  54         struct fpreg r;
  55
  56         /* Can't trace a process that's currently exec'ing. */
  57         if ((p->p_flags & P_INEXEC) != 0)
  58                 return EAGAIN;
  59         if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred))
  60                 return EPERM;
  61
  62         LWPHOLD(lp);
  63         error = procfs_read_fpregs(lp, &r);
  64         if (error == 0)
  65                 error = uiomove_frombuf(&r, sizeof(r), uio);
  66         if (error == 0 && uio->uio_rw == UIO_WRITE) {
  67                 if (lp->lwp_stat != LSSTOP)
  68                         error = EBUSY;
  69                 else
  70                         error = procfs_write_fpregs(lp, &r);
  71         }
  72         LWPRELE(lp);
  73         uio->uio_offset = 0;
  74
  75         return (error);
  76 }
  77
  78 int
  79 procfs_validfpregs(struct lwp *lp)
  80 {
  81         return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0);
  82 }