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procfs_regs.c revision 1.12 
      1 /*	$NetBSD: procfs_regs.c,v 1.12 2001/01/17 00:09:08 fvdl Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1993 Jan-Simon Pendry
      5  * Copyright (c) 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * Jan-Simon Pendry.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the University of
     22  *	California, Berkeley and its contributors.
     23  * 4. Neither the name of the University nor the names of its contributors
     24  *    may be used to endorse or promote products derived from this software
     25  *    without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     37  * SUCH DAMAGE.
     38  *
     39  *	@(#)procfs_regs.c	8.4 (Berkeley) 6/15/94
     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;		/* tracer */
     55 	struct proc *p;			/* traced */
     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 	if ((error = procfs_checkioperm(curp, p)) != 0)
     66 		return (EPERM);
     67 
     68 	kl = sizeof(r);
     69 	kv = (char *) &r;
     70 
     71 	kv += uio->uio_offset;
     72 	kl -= uio->uio_offset;
     73 	if (kl > uio->uio_resid)
     74 		kl = uio->uio_resid;
     75 
     76 	PHOLD(p);
     77 
     78 	if (kl < 0)
     79 		error = EINVAL;
     80 	else
     81 		error = process_read_regs(p, &r);
     82 	if (error == 0)
     83 		error = uiomove(kv, kl, uio);
     84 	if (error == 0 && uio->uio_rw == UIO_WRITE) {
     85 		if (p->p_stat != SSTOP)
     86 			error = EBUSY;
     87 		else
     88 			error = process_write_regs(p, &r);
     89 	}
     90 
     91 	PRELE(p);
     92 
     93 	uio->uio_offset = 0;
     94 	return (error);
     95 #else
     96 	return (EINVAL);
     97 #endif
     98 }
     99 
    100 int
    101 procfs_validregs(p, mp)
    102 	struct proc *p;
    103 	struct mount *mp;
    104 {
    105 
    106 #if defined(PT_SETREGS) || defined(PT_GETREGS)
    107 	return ((p->p_flag & P_SYSTEM) == 0);
    108 #else
    109 	return (0);
    110 #endif
    111 }
    112