bsd/miscfs/procfs/procfs_fpregs.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*      $NetBSD: procfs_fpregs.c,v 1.3 1994/06/29 06:34:48 cgd Exp $    */
  23
  24 /*
  25  * Copyright (c) 1993 Jan-Simon Pendry
  26  * Copyright (c) 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * This code is derived from software contributed to Berkeley by
  30  * Jan-Simon Pendry.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)procfs_fpregs.c     8.2 (Berkeley) 6/15/94
  61  */
  62
  63 #include <sys/param.h>
  64 #include <sys/systm.h>
  65 #include <sys/time.h>
  66 #include <sys/kernel.h>
  67 #include <sys/proc.h>
  68 #include <sys/vnode.h>
  69 #include <sys/ptrace.h>
  70 #include <machine/reg.h>
  71 #include <miscfs/procfs/procfs.h>
  72
  73 int
  74 procfs_dofpregs(curp, p, pfs, uio)
  75         struct proc *curp;
  76         struct proc *p;
  77         struct pfsnode *pfs;
  78         struct uio *uio;
  79 {
  80 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS)
  81         int error;
  82         struct fpreg r;
  83         char *kv;
  84         int kl;
  85
  86         kl = sizeof(r);
  87         kv = (char *) &r;
  88
  89         kv += uio->uio_offset;
  90         kl -= uio->uio_offset;
  91         if (kl > uio->uio_resid)
  92                 kl = uio->uio_resid;
  93
  94         if (kl < 0)
  95                 error = EINVAL;
  96         else
  97                 error = process_read_fpregs(p, &r);
  98         if (error == 0)
  99                 error = uiomove(kv, kl, uio);
 100         if (error == 0 && uio->uio_rw == UIO_WRITE) {
 101                 if (p->p_stat != SSTOP)
 102                         error = EBUSY;
 103                 else
 104                         error = process_write_fpregs(p, &r);
 105         }
 106
 107         uio->uio_offset = 0;
 108         return (error);
 109 #else
 110         return (EINVAL);
 111 #endif
 112 }
 113
 114 int
 115 procfs_validfpregs(p)
 116         struct proc *p;
 117 {
 118
 119 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS)
 120         return ((p->p_flag & P_SYSTEM) == 0);
 121 #else
 122         return (0);
 123 #endif
 124 }