1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1993 Jan-Simon Pendry
5 * Copyright (c) 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * From:
36 *	$Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
37 */
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/lock.h>
42#include <sys/mutex.h>
43#include <sys/proc.h>
44#include <sys/ptrace.h>
45#include <sys/uio.h>
46
47#include <fs/pseudofs/pseudofs.h>
48#include <fs/procfs/procfs.h>
49
50#ifdef COMPAT_FREEBSD32
51#include <sys/sysent.h>
52#include <sys/procfs.h>
53#include <machine/fpu.h>
54
55/*
56 * PROC(write, fpregs, td2, &r) becomes
57 * proc_write_fpregs(td2, &r)   or
58 * proc_write_fpregs32(td2, &r32)
59 *
60 * UIOMOVE_FROMBUF(r, uio) becomes
61 * uiomove_frombuf(&r, sizeof(r), uio)  or
62 * uiomove_frombuf(&r32, sizeof(r32), uio)
63 */
64#define	PROC(d, w, t, r)	wrap32 ? \
65	proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
66	proc_ ## d ## _ ## w(t, r)
67#define	UIOMOVE_FROMBUF(k, u)	wrap32 ? \
68	uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
69	uiomove_frombuf(& k, sizeof(k), u)
70#else
71#define	PROC(d, w, t, r)	proc_ ## d ## _ ## w(t, r)
72#define	UIOMOVE_FROMBUF(k, u)	uiomove_frombuf(& k, sizeof(k), u)
73#endif
74
75int
76procfs_doprocfpregs(PFS_FILL_ARGS)
77{
78	int error;
79	struct fpreg r;
80	struct thread *td2;
81#ifdef COMPAT_FREEBSD32
82	struct fpreg32 r32;
83	int wrap32 = 0;
84#endif
85
86	if (uio->uio_offset != 0)
87		return (0);
88
89	PROC_LOCK(p);
90	PROC_ASSERT_HELD(p);
91	if (p_candebug(td, p)) {
92		PROC_UNLOCK(p);
93		return (EPERM);
94	}
95	if (!P_SHOULDSTOP(p)) {
96		PROC_UNLOCK(p);
97		return (EBUSY);
98	}
99
100	td2 = FIRST_THREAD_IN_PROC(p);
101#ifdef COMPAT_FREEBSD32
102	if (SV_CURPROC_FLAG(SV_ILP32)) {
103		if (SV_PROC_FLAG(td2->td_proc, SV_ILP32) == 0) {
104			PROC_UNLOCK(p);
105			return (EINVAL);
106		}
107		wrap32 = 1;
108		memset(&r32, 0, sizeof(r32));
109	} else
110#endif
111		memset(&r, 0, sizeof(r));
112	error = PROC(read, fpregs, td2, &r);
113	if (error == 0) {
114		PROC_UNLOCK(p);
115		error = UIOMOVE_FROMBUF(r, uio);
116		PROC_LOCK(p);
117	}
118	if (error == 0 && uio->uio_rw == UIO_WRITE) {
119		if (!P_SHOULDSTOP(p))
120			error = EBUSY;
121		else
122			/* XXXKSE: */
123			error = PROC(write, fpregs, td2, &r);
124	}
125	PROC_UNLOCK(p);
126
127	return (error);
128}
129