1 /*-
2 * Copyright (c) 1999 Brian Scott Dean, brdean@unx.sas.com.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Jan-Simon Pendry under the following copyrights and conditions:
7 *
8 * Copyright (c) 1993 Jan-Simon Pendry
9 * Copyright (c) 1993
10 * The Regents of the University of California. All rights reserved.
11 *
12 * This code is derived from software contributed to Berkeley by
13 * Jan-Simon Pendry.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * From: @(#)procfs_regs.c 8.4 (Berkeley) 6/15/94
40 *
41 * From:
42 * $Id: procfs_regs.c,v 3.2 1993/12/15 09:40:17 jsp Exp $
43 * $FreeBSD$
44 */
45
46 #include "opt_compat.h"
47
48 #include <sys/param.h>
49 #include <sys/systm.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/proc.h>
53 #include <sys/ptrace.h>
54 #include <sys/uio.h>
55
56 #include <machine/reg.h>
57
58 #include <fs/pseudofs/pseudofs.h>
59 #include <fs/procfs/procfs.h>
60
61 #ifdef COMPAT_IA32
62 #include <sys/procfs.h>
63 #include <machine/fpu.h>
64 #include <compat/ia32/ia32_reg.h>
65
66 extern struct sysentvec ia32_freebsd_sysvec;
67 /*
68 * PROC(write, dbregs, td2, &r) becomes
69 * proc_write_dbregs(td2, &r) or
70 * proc_write_dbregs32(td2, &r32)
71 *
72 * UIOMOVE_FROMBUF(r, uio) becomes
73 * uiomove_frombuf(&r, sizeof(r), uio) or
74 * uiomove_frombuf(&r32, sizeof(r32), uio)
75 */
76 #define PROC(d, w, t, r) wrap32 ? \
77 proc_ ## d ## _ ## w ## 32(t, r ## 32) : \
78 proc_ ## d ## _ ## w(t, r)
79 #define UIOMOVE_FROMBUF(k, u) wrap32 ? \
80 uiomove_frombuf(& k ## 32, sizeof(k ## 32), u) : \
81 uiomove_frombuf(& k, sizeof(k), u)
82 #else
83 #define PROC(d, w, t, r) proc_ ## d ## _ ## w(t, r)
84 #define UIOMOVE_FROMBUF(k, u) uiomove_frombuf(& k, sizeof(k), u)
85 #endif
86
87 int
88 procfs_doprocdbregs(PFS_FILL_ARGS)
89 {
90 int error;
91 struct dbreg r;
92 struct thread *td2;
93 #ifdef COMPAT_IA32
94 struct dbreg32 r32;
95 int wrap32 = 0;
96 #endif
97
98 if (uio->uio_offset != 0)
99 return (0);
100
101 PROC_LOCK(p);
102 KASSERT(p->p_lock > 0, ("proc not held"));
103 if (p_candebug(td, p) != 0) {
104 PROC_UNLOCK(p);
105 return (EPERM);
106 }
107
108 /* XXXKSE: */
109 td2 = FIRST_THREAD_IN_PROC(p);
110 #ifdef COMPAT_IA32
111 if (td->td_proc->p_sysent == &ia32_freebsd_sysvec) {
112 if (td2->td_proc->p_sysent != &ia32_freebsd_sysvec) {
113 PROC_UNLOCK(p);
114 return (EINVAL);
115 }
116 wrap32 = 1;
117 }
118 #endif
119 error = PROC(read, dbregs, td2, &r);
120 if (error == 0) {
121 PROC_UNLOCK(p);
122 error = UIOMOVE_FROMBUF(r, uio);
123 PROC_LOCK(p);
124 }
125 if (error == 0 && uio->uio_rw == UIO_WRITE) {
126 if (!P_SHOULDSTOP(p)) /* XXXKSE should be P_TRACED? */
127 error = EBUSY;
128 else
129 /* XXXKSE: */
130 error = PROC(write, dbregs, td2, &r);
131 }
132 PROC_UNLOCK(p);
133
134 return (error);
135 }
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