1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Jan-Simon Pendry under the following copyrights and conditions:
9 *
10 * Copyright (c) 1993 Jan-Simon Pendry
11 * Copyright (c) 1993
12 * The Regents of the University of California. All rights reserved.
13 *
14 * This code is derived from software contributed to Berkeley by
15 * Jan-Simon Pendry.
16 *
17 * Redistribution and use in source and binary forms, with or without
18 * modification, are permitted provided that the following conditions
19 * are met:
20 * 1. Redistributions of source code must retain the above copyright
21 * notice, this list of conditions and the following disclaimer.
22 * 2. Redistributions in binary form must reproduce the above copyright
23 * notice, this list of conditions and the following disclaimer in the
24 * documentation and/or other materials provided with the distribution.
25 * 3. Neither the name of the University nor the names of its contributors
26 * may be used to endorse or promote products derived from this software
27 * without specific prior written permission.
28 *
29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 * SUCH DAMAGE.
40 *
41 * From:
42 * $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
43 */
44
45 #include <sys/param.h>
46 #include <sys/systm.h>
47 #include <sys/lock.h>
48 #include <sys/mutex.h>
49 #include <sys/proc.h>
50 #include <sys/ptrace.h>
51 #include <sys/uio.h>
52
53 #include <fs/pseudofs/pseudofs.h>
54 #include <fs/procfs/procfs.h>
55
56 #ifdef COMPAT_FREEBSD32
57 #include <sys/sysent.h>
58 #include <sys/procfs.h>
59 #include <machine/fpu.h>
60
61 /*
62 * PROC(write, dbregs, td2, &r) becomes
63 * proc_write_dbregs(td2, &r) or
64 * proc_write_dbregs32(td2, &r32)
65 *
66 * UIOMOVE_FROMBUF(r, uio) becomes
67 * uiomove_frombuf(&r, sizeof(r), uio) or
68 * uiomove_frombuf(&r32, sizeof(r32), uio)
69 */
70 #define PROC(d, w, t, r) wrap32 ? \
71 proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
72 proc_ ## d ## _ ## w(t, r)
73 #define UIOMOVE_FROMBUF(k, u) wrap32 ? \
74 uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
75 uiomove_frombuf(& k, sizeof(k), u)
76 #else
77 #define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r)
78 #define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u)
79 #endif
80
81 int
procfs_doprocdbregs(PFS_FILL_ARGS)82 procfs_doprocdbregs(PFS_FILL_ARGS)
83 {
84 int error;
85 struct dbreg r;
86 struct thread *td2;
87 #ifdef COMPAT_FREEBSD32
88 struct dbreg32 r32;
89 int wrap32 = 0;
90 #endif
91
92 if (uio->uio_offset != 0)
93 return (0);
94
95 PROC_LOCK(p);
96 PROC_ASSERT_HELD(p);
97 if (p_candebug(td, p) != 0) {
98 PROC_UNLOCK(p);
99 return (EPERM);
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, dbregs, 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)) /* XXXKSE should be P_TRACED? */
122 error = EBUSY;
123 else
124 /* XXXKSE: */
125 error = PROC(write, dbregs, td2, &r);
126 }
127 PROC_UNLOCK(p);
128
129 return (error);
130 }
131