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 * @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94
36 *
37 * From:
38 * $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
39 * $FreeBSD$
40 */
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/uio.h>
49
50 #include <fs/pseudofs/pseudofs.h>
51 #include <fs/procfs/procfs.h>
52
53 #ifdef COMPAT_FREEBSD32
54 #include <sys/procfs.h>
55 #include <sys/sysent.h>
56 #include <machine/fpu.h>
57
58 /*
59 * PROC(write, regs, td2, &r) becomes
60 * proc_write_regs(td2, &r) or
61 * proc_write_regs32(td2, &r32)
62 *
63 * UIOMOVE_FROMBUF(r, uio) becomes
64 * uiomove_frombuf(&r, sizeof(r), uio) or
65 * uiomove_frombuf(&r32, sizeof(r32), uio)
66 */
67 #define PROC(d, w, t, r) wrap32 ? \
68 proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
69 proc_ ## d ## _ ## w(t, r)
70 #define UIOMOVE_FROMBUF(k, u) wrap32 ? \
71 uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
72 uiomove_frombuf(& k, sizeof(k), u)
73 #else
74 #define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r)
75 #define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u)
76 #endif
77
78 int
79 procfs_doprocregs(PFS_FILL_ARGS)
80 {
81 int error;
82 struct reg r;
83 struct thread *td2;
84 #ifdef COMPAT_FREEBSD32
85 struct reg32 r32;
86 int wrap32 = 0;
87 #endif
88
89 if (uio->uio_offset != 0)
90 return (0);
91
92 PROC_LOCK(p);
93 PROC_ASSERT_HELD(p);
94 if (p_candebug(td, p)) {
95 PROC_UNLOCK(p);
96 return (EPERM);
97 }
98 if (!P_SHOULDSTOP(p)) {
99 PROC_UNLOCK(p);
100 return (EBUSY);
101 }
102
103 td2 = FIRST_THREAD_IN_PROC(p);
104 #ifdef COMPAT_FREEBSD32
105 if (SV_CURPROC_FLAG(SV_ILP32)) {
106 if ((SV_PROC_FLAG(td2->td_proc, SV_ILP32)) == 0) {
107 PROC_UNLOCK(p);
108 return (EINVAL);
109 }
110 wrap32 = 1;
111 memset(&r32, 0, sizeof(r32));
112 } else
113 #endif
114 memset(&r, 0, sizeof(r));
115 error = PROC(read, regs, td2, &r);
116 if (error == 0) {
117 PROC_UNLOCK(p);
118 error = UIOMOVE_FROMBUF(r, uio);
119 PROC_LOCK(p);
120 }
121 if (error == 0 && uio->uio_rw == UIO_WRITE) {
122 if (!P_SHOULDSTOP(p))
123 error = EBUSY;
124 else
125 /* XXXKSE: */
126 error = PROC(write, regs, td2, &r);
127 }
128 PROC_UNLOCK(p);
129
130 return (error);
131 }
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