procfs_fpregs.c revision 331722 
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_fpregs.c	8.2 (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: stable/11/sys/fs/procfs/procfs_fpregs.c 331722 2018-03-29 02:50:57Z eadler $
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_FREEBSD32
57#include <sys/procfs.h>
58#include <machine/fpu.h>
59
60/*
61 * PROC(write, fpregs, td2, &r) becomes
62 * proc_write_fpregs(td2, &r)   or
63 * proc_write_fpregs32(td2, &r32)
64 *
65 * UIOMOVE_FROMBUF(r, uio) becomes
66 * uiomove_frombuf(&r, sizeof(r), uio)  or
67 * uiomove_frombuf(&r32, sizeof(r32), uio)
68 */
69#define	PROC(d, w, t, r)	wrap32 ? \
70	proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
71	proc_ ## d ## _ ## w(t, r)
72#define	UIOMOVE_FROMBUF(k, u)	wrap32 ? \
73	uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
74	uiomove_frombuf(& k, sizeof(k), u)
75#else
76#define	PROC(d, w, t, r)	proc_ ## d ## _ ## w(t, r)
77#define	UIOMOVE_FROMBUF(k, u)	uiomove_frombuf(& k, sizeof(k), u)
78#endif
79
80int
81procfs_doprocfpregs(PFS_FILL_ARGS)
82{
83	int error;
84	struct fpreg r;
85	struct thread *td2;
86#ifdef COMPAT_FREEBSD32
87	struct fpreg32 r32;
88	int wrap32 = 0;
89#endif
90
91	if (uio->uio_offset != 0)
92		return (0);
93
94	PROC_LOCK(p);
95	PROC_ASSERT_HELD(p);
96	if (p_candebug(td, p)) {
97		PROC_UNLOCK(p);
98		return (EPERM);
99	}
100	if (!P_SHOULDSTOP(p)) {
101		PROC_UNLOCK(p);
102		return (EBUSY);
103	}
104
105	/* XXXKSE: */
106	td2 = FIRST_THREAD_IN_PROC(p);
107#ifdef COMPAT_FREEBSD32
108	if (SV_CURPROC_FLAG(SV_ILP32)) {
109		if (SV_PROC_FLAG(td2->td_proc, SV_ILP32) == 0) {
110			PROC_UNLOCK(p);
111			return (EINVAL);
112		}
113		wrap32 = 1;
114	}
115#endif
116	error = PROC(read, fpregs, td2, &r);
117	if (error == 0) {
118		PROC_UNLOCK(p);
119		error = UIOMOVE_FROMBUF(r, uio);
120		PROC_LOCK(p);
121	}
122	if (error == 0 && uio->uio_rw == UIO_WRITE) {
123		if (!P_SHOULDSTOP(p))
124			error = EBUSY;
125		else
126			/* XXXKSE: */
127			error = PROC(write, fpregs, td2, &r);
128	}
129	PROC_UNLOCK(p);
130
131	return (error);
132}
133