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procfs_regs.c revision 1.6 
      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: Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp
     38  *	from: @(#)procfs_regs.c	8.3 (Berkeley) 1/27/94
     39  *	$Id: procfs_regs.c,v 1.6 1994/06/08 11:33:38 mycroft Exp $
     40  */
     41 
     42 #include <sys/param.h>
     43 #include <sys/systm.h>
     44 #include <sys/time.h>
     45 #include <sys/kernel.h>
     46 #include <sys/proc.h>
     47 #include <sys/vnode.h>
     48 #include <sys/ptrace.h>
     49 #include <machine/reg.h>
     50 #include <miscfs/procfs/procfs.h>
     51 
     52 int
     53 procfs_doregs(curp, p, pfs, uio)
     54 	struct proc *curp;
     55 	struct proc *p;
     56 	struct pfsnode *pfs;
     57 	struct uio *uio;
     58 {
     59 #if defined(PT_GETREGS) || defined(PT_SETREGS)
     60 	int error;
     61 	struct reg r;
     62 	char *kv;
     63 	int kl;
     64 
     65 	kl = sizeof(r);
     66 	kv = (char *) &r;
     67 
     68 	kv += uio->uio_offset;
     69 	kl -= uio->uio_offset;
     70 	if (kl > uio->uio_resid)
     71 		kl = uio->uio_resid;
     72 
     73 	if (kl < 0)
     74 		error = EINVAL;
     75 	else
     76 		error = process_read_regs(p, &r);
     77 	if (error == 0)
     78 		error = uiomove(kv, kl, uio);
     79 	if (error == 0 && uio->uio_rw == UIO_WRITE) {
     80 		if (p->p_stat != SSTOP)
     81 			error = EBUSY;
     82 		else
     83 			error = process_write_regs(p, &r);
     84 	}
     85 
     86 	uio->uio_offset = 0;
     87 	return (error);
     88 #else
     89 	return (EINVAL);
     90 #endif
     91 }
     92 
     93 int
     94 procfs_validregs(p)
     95 	struct proc *p;
     96 {
     97 
     98 #if defined(PT_SETREGS) || defined(PT_GETREGS)
     99 	return ((p->p_flag & P_SYSTEM) == 0);
    100 #else
    101 	return (0);
    102 #endif
    103 }
    104