Home | History | Annotate | Line # | Download | only in procfs
procfs_fpregs.c revision 1.2 
      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. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  *
     37  *	from: @(#)procfs_fpregs.c	8.2 (Berkeley) 6/15/94
     38  *	$Id: procfs_fpregs.c,v 1.2 1994/06/15 22:59:05 mycroft Exp $
     39  */
     40 
     41 #include <sys/param.h>
     42 #include <sys/systm.h>
     43 #include <sys/time.h>
     44 #include <sys/kernel.h>
     45 #include <sys/proc.h>
     46 #include <sys/vnode.h>
     47 #include <sys/ptrace.h>
     48 #include <machine/reg.h>
     49 #include <miscfs/procfs/procfs.h>
     50 
     51 int
     52 procfs_dofpregs(curp, p, pfs, uio)
     53 	struct proc *curp;
     54 	struct proc *p;
     55 	struct pfsnode *pfs;
     56 	struct uio *uio;
     57 {
     58 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS)
     59 	int error;
     60 	struct fpreg r;
     61 	char *kv;
     62 	int kl;
     63 
     64 	kl = sizeof(r);
     65 	kv = (char *) &r;
     66 
     67 	kv += uio->uio_offset;
     68 	kl -= uio->uio_offset;
     69 	if (kl > uio->uio_resid)
     70 		kl = uio->uio_resid;
     71 
     72 	if (kl < 0)
     73 		error = EINVAL;
     74 	else
     75 		error = process_read_fpregs(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 = process_write_fpregs(p, &r);
     83 	}
     84 
     85 	uio->uio_offset = 0;
     86 	return (error);
     87 #else
     88 	return (EINVAL);
     89 #endif
     90 }
     91 
     92 int
     93 procfs_validfpregs(p)
     94 	struct proc *p;
     95 {
     96 
     97 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS)
     98 	return ((p->p_flag & P_SYSTEM) == 0);
     99 #else
    100 	return (0);
    101 #endif
    102 }
    103