kernel - Major signal path adjustments to fix races, tsleep race fixes, +more
[dragonfly.git] / sys / vfs / procfs / procfs_dbregs.c
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1/*-
2 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jan-Simon Pendry under the following copyrights and conditions:
7 *
8 * Copyright (c) 1993 Jan-Simon Pendry
9 * Copyright (c) 1993
10 * The Regents of the University of California. All rights reserved.
11 *
12 * This code is derived from software contributed to Berkeley by
13 * Jan-Simon Pendry.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 3. All advertising materials mentioning features or use of this software
24 * must display the following acknowledgement:
25 * This product includes software developed by the University of
26 * California, Berkeley and its contributors.
27 * 4. Neither the name of the University nor the names of its contributors
28 * may be used to endorse or promote products derived from this software
29 * without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * SUCH DAMAGE.
42 *
43 * $FreeBSD: src/sys/miscfs/procfs/procfs_dbregs.c,v 1.4.2.3 2002/01/22 17:22:59 nectar Exp $
c7e98b2f 44 * $DragonFly: src/sys/vfs/procfs/procfs_dbregs.c,v 1.10 2007/02/19 01:14:24 corecode Exp $
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45 */
46
47#include <sys/param.h>
48#include <sys/proc.h>
75bda2d9 49#include <sys/priv.h>
984263bc 50#include <sys/vnode.h>
527fddf7 51#include <sys/reg.h>
1f2de5d4 52#include <vfs/procfs/procfs.h>
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53#include <vm/vm.h>
54
55int
c7e98b2f 56procfs_dodbregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
ac424f9b 57 struct uio *uio)
984263bc 58{
c7e98b2f 59 struct proc *p = lp->lwp_proc;
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60 int error;
61 struct dbreg r;
62 char *kv;
63 int kl;
64
65 /* Can't trace a process that's currently exec'ing. */
4643740a 66 if ((p->p_flags & P_INEXEC) != 0)
984263bc 67 return EAGAIN;
41c20dac 68 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred))
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69 return (EPERM);
70 kl = sizeof(r);
71 kv = (char *) &r;
72
73 kv += uio->uio_offset;
74 kl -= uio->uio_offset;
75 if (kl > uio->uio_resid)
76 kl = uio->uio_resid;
77
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78 LWPHOLD(lp);
79 error = procfs_read_dbregs(lp, &r);
984263bc 80 if (error == 0)
25e80b06 81 error = uiomove_frombuf(&r, sizeof(r), uio);
984263bc 82 if (error == 0 && uio->uio_rw == UIO_WRITE) {
c7e98b2f 83 if (lp->lwp_stat != LSSTOP)
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84 error = EBUSY;
85 else
c7e98b2f 86 error = procfs_write_dbregs(lp, &r);
984263bc 87 }
c7e98b2f 88 LWPRELE(lp);
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89
90 uio->uio_offset = 0;
91 return (error);
92}
93
94int
c7e98b2f 95procfs_validdbregs(struct lwp *lp)
984263bc 96{
4643740a 97 return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0);
984263bc 98}