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/procfs.h>
52 #include <sys/sysent.h>
53 #include <machine/fpu.h>
54
55 /*
56 * PROC(write, regs, td2, &r) becomes
57 * proc_write_regs(td2, &r) or
58 * proc_write_regs32(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
75 int
procfs_doprocregs(PFS_FILL_ARGS)76 procfs_doprocregs(PFS_FILL_ARGS)
77 {
78 int error;
79 struct reg r;
80 struct thread *td2;
81 #ifdef COMPAT_FREEBSD32
82 struct reg32 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, regs, 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, regs, td2, &r);
124 }
125 PROC_UNLOCK(p);
126
127 return (error);
128 }
129