procfs_regs.c revision 189282 
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 * 4. 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 *	$Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
37 * $FreeBSD: head/sys/fs/procfs/procfs_regs.c 189282 2009-03-02 18:43:50Z kib $
38 */
39
40#include "opt_compat.h"
41
42#include <sys/param.h>
43#include <sys/systm.h>
44#include <sys/lock.h>
45#include <sys/mutex.h>
46#include <sys/proc.h>
47#include <sys/ptrace.h>
48#include <sys/sysent.h>
49#include <sys/uio.h>
50
51#include <machine/reg.h>
52
53#include <fs/pseudofs/pseudofs.h>
54#include <fs/procfs/procfs.h>
55
56#ifdef COMPAT_IA32
57#include <sys/procfs.h>
58#include <machine/fpu.h>
59#include <compat/ia32/ia32_reg.h>
60
61/*
62 * PROC(write, regs, td2, &r) becomes
63 * proc_write_regs(td2, &r)   or
64 * proc_write_regs32(td2, &r32)
65 *
66 * UIOMOVE_FROMBUF(r, uio) becomes
67 * uiomove_frombuf(&r, sizeof(r), uio)  or
68 * uiomove_frombuf(&r32, sizeof(r32), uio)
69 */
70#define	PROC(d, w, t, r)	wrap32 ? \
71	proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
72	proc_ ## d ## _ ## w(t, r)
73#define	UIOMOVE_FROMBUF(k, u)	wrap32 ? \
74	uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
75	uiomove_frombuf(& k, sizeof(k), u)
76#else
77#define	PROC(d, w, t, r)	proc_ ## d ## _ ## w(t, r)
78#define	UIOMOVE_FROMBUF(k, u)	uiomove_frombuf(& k, sizeof(k), u)
79#endif
80
81int
82procfs_doprocregs(PFS_FILL_ARGS)
83{
84	int error;
85	struct reg r;
86	struct thread *td2;
87#ifdef COMPAT_IA32
88	struct reg32 r32;
89	int wrap32 = 0;
90#endif
91
92	if (uio->uio_offset != 0)
93		return (0);
94
95	PROC_LOCK(p);
96	PROC_ASSERT_HELD(p);
97	if (p_candebug(td, p)) {
98		PROC_UNLOCK(p);
99		return (EPERM);
100	}
101
102	/* XXXKSE: */
103	td2 = FIRST_THREAD_IN_PROC(p);
104#ifdef COMPAT_IA32
105	if (SV_CURPROC_FLAG(SV_ILP32)) {
106		if ((td2->td_proc->p_sysent->sv_flags & SV_ILP32) == 0) {
107			PROC_UNLOCK(p);
108			return (EINVAL);
109		}
110		wrap32 = 1;
111	}
112#endif
113	error = PROC(read, regs, td2, &r);
114	if (error == 0) {
115		PROC_UNLOCK(p);
116		error = UIOMOVE_FROMBUF(r, uio);
117		PROC_LOCK(p);
118	}
119	if (error == 0 && uio->uio_rw == UIO_WRITE) {
120		if (!P_SHOULDSTOP(p))
121			error = EBUSY;
122		else
123			/* XXXKSE: */
124			error = PROC(write, regs, td2, &r);
125	}
126	PROC_UNLOCK(p);
127
128	return (error);
129}
130