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. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94
34 *
35 * From:
36 * $FreeBSD: src/sys/miscfs/procfs/procfs_regs.c,v 1.10.2.3 2002/01/22 17:22:59 nectar Exp $
37 */
38
39 #include <sys/param.h>
40 #include <sys/uio.h>
41 #include <sys/proc.h>
42 #include <sys/caps.h>
43 #include <sys/vnode.h>
44 #include <sys/reg.h>
45 #include <vfs/procfs/procfs.h>
46 #include <vm/vm.h>
47 #include <vm/vm_extern.h>
48
49 int
procfs_doregs(struct proc * curp,struct lwp * lp,struct pfsnode * pfs,struct uio * uio)50 procfs_doregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
51 struct uio *uio)
52 {
53 struct proc *p = lp->lwp_proc;
54 int error;
55 struct reg r;
56
57 /* Can't trace a process that's currently exec'ing. */
58 if ((p->p_flags & P_INEXEC) != 0)
59 return EAGAIN;
60 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred))
61 return EPERM;
62
63 LWPHOLD(lp);
64 error = procfs_read_regs(lp, &r);
65 if (error == 0)
66 error = uiomove_frombuf(&r, sizeof(r), uio);
67 if (error == 0 && uio->uio_rw == UIO_WRITE) {
68 if (p->p_stat != SSTOP)
69 error = EBUSY;
70 else
71 error = procfs_write_regs(lp, &r);
72 }
73 LWPRELE(lp);
74 uio->uio_offset = 0;
75
76 return (error);
77 }
78
79 int
procfs_validregs(struct lwp * lp)80 procfs_validregs(struct lwp *lp)
81 {
82 return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0);
83 }
84