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procfs_regs.c revision 1.1 
      1 /*
      2  * Copyright (c) 1993 The Regents of the University of California.
      3  * Copyright (c) 1993 Jan-Simon Pendry
      4  * 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:
     38  *	Id: procfs_regs.c,v 4.1 1993/12/17 10:47:45 jsp Rel
     39  *
     40  *	$Id: procfs_regs.c,v 1.1 1994/01/05 07:51:24 cgd Exp $
     41  */
     42 
     43 #include <sys/param.h>
     44 #include <sys/systm.h>
     45 #include <sys/time.h>
     46 #include <sys/kernel.h>
     47 #include <sys/proc.h>
     48 #include <sys/vnode.h>
     49 #include <machine/reg.h>
     50 #include <miscfs/procfs/procfs.h>
     51 
     52 pfs_doregs(curp, p, pfs, uio)
     53 	struct proc *curp;
     54 	struct proc *p;
     55 	struct pfsnode *pfs;
     56 	struct uio *uio;
     57 {
     58 	int error;
     59 	struct reg r;
     60 	char *kv;
     61 	int kl;
     62 
     63 	kl = sizeof(r);
     64 	kv = (char *) &r;
     65 
     66 	kv += uio->uio_offset;
     67 	kl -= uio->uio_offset;
     68 	if (kl > uio->uio_resid)
     69 		kl = uio->uio_resid;
     70 
     71 	if (kl < 0)
     72 		error = EINVAL;
     73 	else
     74 		error = procfs_read_regs(p, &r);
     75 	if (error == 0)
     76 		error = uiomove(kv, kl, uio);
     77 	if (error == 0 && uio->uio_rw == UIO_WRITE) {
     78 		if ((p->p_flag & SSTOP) == 0)
     79 			error = EBUSY;
     80 		else
     81 			error = procfs_write_regs(p, &r);
     82 	}
     83 
     84 	uio->uio_offset = 0;
     85 	return (error);
     86 }
     87