kernel - Major signal path adjustments to fix races, tsleep race fixes, +more
[dragonfly.git] / sys / vfs / procfs / procfs_regs.c
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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 * @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94
38 *
39 * From:
40 * $FreeBSD: src/sys/miscfs/procfs/procfs_regs.c,v 1.10.2.3 2002/01/22 17:22:59 nectar Exp $
c7e98b2f 41 * $DragonFly: src/sys/vfs/procfs/procfs_regs.c,v 1.11 2007/02/19 01:14:24 corecode Exp $
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42 */
43
44#include <sys/param.h>
45#include <sys/proc.h>
75bda2d9 46#include <sys/priv.h>
984263bc 47#include <sys/vnode.h>
527fddf7 48#include <sys/reg.h>
1f2de5d4 49#include <vfs/procfs/procfs.h>
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50#include <vm/vm.h>
51#include <vm/vm_extern.h>
52
53int
c7e98b2f 54procfs_doregs(struct proc *curp, struct lwp *lp, struct pfsnode *pfs,
ac424f9b 55 struct uio *uio)
984263bc 56{
c7e98b2f 57 struct proc *p = lp->lwp_proc;
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58 int error;
59 struct reg r;
60 char *kv;
61 int kl;
62
63 /* Can't trace a process that's currently exec'ing. */
4643740a 64 if ((p->p_flags & P_INEXEC) != 0)
984263bc 65 return EAGAIN;
41c20dac 66 if (!CHECKIO(curp, p) || p_trespass(curp->p_ucred, p->p_ucred))
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67 return EPERM;
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
c7e98b2f 76 LWPHOLD(lp);
984263bc 77
c7e98b2f 78 error = procfs_read_regs(lp, &r);
984263bc 79 if (error == 0)
fa9f7acd 80 error = uiomove_frombuf(&r, sizeof(r), uio);
984263bc 81 if (error == 0 && uio->uio_rw == UIO_WRITE) {
164b8401 82 if (p->p_stat != SSTOP)
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83 error = EBUSY;
84 else
c7e98b2f 85 error = procfs_write_regs(lp, &r);
984263bc 86 }
c7e98b2f 87 LWPRELE(lp);
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88
89 uio->uio_offset = 0;
90 return (error);
91}
92
93int
c7e98b2f 94procfs_validregs(struct lwp *lp)
984263bc 95{
4643740a 96 return ((lp->lwp_proc->p_flags & P_SYSTEM) == 0);
984263bc 97}