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 */
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/lock.h>
44 #include <sys/mutex.h>
45 #include <sys/proc.h>
46 #include <sys/ptrace.h>
47 #include <sys/uio.h>
48
49 #include <fs/pseudofs/pseudofs.h>
50 #include <fs/procfs/procfs.h>
51
52 #ifdef COMPAT_FREEBSD32
53 #include <sys/procfs.h>
54 #include <sys/sysent.h>
55 #include <machine/fpu.h>
56
57 /*
58 * PROC(write, regs, td2, &r) becomes
59 * proc_write_regs(td2, &r) or
60 * proc_write_regs32(td2, &r32)
61 *
62 * UIOMOVE_FROMBUF(r, uio) becomes
63 * uiomove_frombuf(&r, sizeof(r), uio) or
64 * uiomove_frombuf(&r32, sizeof(r32), uio)
65 */
66 #define PROC(d, w, t, r) wrap32 ? \
67 proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
68 proc_ ## d ## _ ## w(t, r)
69 #define UIOMOVE_FROMBUF(k, u) wrap32 ? \
70 uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
71 uiomove_frombuf(& k, sizeof(k), u)
72 #else
73 #define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r)
74 #define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u)
75 #endif
76
77 int
procfs_doprocregs(PFS_FILL_ARGS)78 procfs_doprocregs(PFS_FILL_ARGS)
79 {
80 int error;
81 struct reg r;
82 struct thread *td2;
83 #ifdef COMPAT_FREEBSD32
84 struct reg32 r32;
85 int wrap32 = 0;
86 #endif
87
88 if (uio->uio_offset != 0)
89 return (0);
90
91 PROC_LOCK(p);
92 PROC_ASSERT_HELD(p);
93 if (p_candebug(td, p)) {
94 PROC_UNLOCK(p);
95 return (EPERM);
96 }
97 if (!P_SHOULDSTOP(p)) {
98 PROC_UNLOCK(p);
99 return (EBUSY);
100 }
101
102 td2 = FIRST_THREAD_IN_PROC(p);
103 #ifdef COMPAT_FREEBSD32
104 if (SV_CURPROC_FLAG(SV_ILP32)) {
105 if ((SV_PROC_FLAG(td2->td_proc, SV_ILP32)) == 0) {
106 PROC_UNLOCK(p);
107 return (EINVAL);
108 }
109 wrap32 = 1;
110 memset(&r32, 0, sizeof(r32));
111 } else
112 #endif
113 memset(&r, 0, sizeof(r));
114 error = PROC(read, regs, td2, &r);
115 if (error == 0) {
116 PROC_UNLOCK(p);
117 error = UIOMOVE_FROMBUF(r, uio);
118 PROC_LOCK(p);
119 }
120 if (error == 0 && uio->uio_rw == UIO_WRITE) {
121 if (!P_SHOULDSTOP(p))
122 error = EBUSY;
123 else
124 /* XXXKSE: */
125 error = PROC(write, regs, td2, &r);
126 }
127 PROC_UNLOCK(p);
128
129 return (error);
130 }
131