1 /* $NetBSD: freebsd_ptrace.c,v 1.17 2007/12/20 23:02:47 dsl Exp $ */
2
3 /*-
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
6 * (c) UNIX System Laboratories, Inc.
7 * All or some portions of this file are derived from material licensed
8 * to the University of California by American Telephone and Telegraph
9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10 * the permission of UNIX System Laboratories, Inc.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
37 */
38
39 /*-
40 * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved.
41 *
42 * Redistribution and use in source and binary forms, with or without
43 * modification, are permitted provided that the following conditions
44 * are met:
45 * 1. Redistributions of source code must retain the above copyright
46 * notice, this list of conditions and the following disclaimer.
47 * 2. Redistributions in binary form must reproduce the above copyright
48 * notice, this list of conditions and the following disclaimer in the
49 * documentation and/or other materials provided with the distribution.
50 * 3. All advertising materials mentioning features or use of this software
51 * must display the following acknowledgement:
52 * This product includes software developed by the University of
53 * California, Berkeley and its contributors.
54 * 4. Neither the name of the University nor the names of its contributors
55 * may be used to endorse or promote products derived from this software
56 * without specific prior written permission.
57 *
58 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
61 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
68 * SUCH DAMAGE.
69 *
70 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93
71 */
72
73 #include <sys/cdefs.h>
74 __KERNEL_RCSID(0, "$NetBSD: freebsd_ptrace.c,v 1.17 2007/12/20 23:02:47 dsl Exp $");
75
76 #if defined(_KERNEL_OPT)
77 #include "opt_ptrace.h"
78 #endif
79
80 #include <sys/param.h>
81 #include <sys/systm.h>
82 #include <sys/proc.h>
83 #include <sys/errno.h>
84 #include <sys/ptrace.h>
85 #include <sys/uio.h>
86 #include <sys/user.h>
87 #include <sys/mount.h>
88 #include <sys/syscallargs.h>
89
90 #include <compat/sys/signal.h>
91 #include <compat/sys/signalvar.h>
92
93 #include <machine/reg.h>
94 #include <machine/freebsd_machdep.h>
95
96 #include <compat/common/compat_util.h>
97 #include <compat/freebsd/freebsd_syscallargs.h>
98 #include <compat/freebsd/freebsd_ptrace.h>
99
100 /*
101 * Process debugging system call.
102 */
103 int
104 freebsd_sys_ptrace(struct lwp *l, const struct freebsd_sys_ptrace_args *uap, register_t *retval)
105 {
106 #if defined(PTRACE) || defined(_LKM)
107 /* {
108 syscallarg(int) req;
109 syscallarg(pid_t) pid;
110 syscallarg(void *) addr;
111 syscallarg(int) data;
112 } */
113 struct sys_ptrace_args npa;
114 #ifdef _LKM
115 sy_call_t sys_ptrace = sysent[SYS_ptrace].sy_call;
116 #endif
117
118 switch (SCARG(uap, req)) {
119 #ifdef PT_STEP
120 case FREEBSD_PT_STEP:
121 SCARG(&npa, req) = PT_STEP;
122 SCARG(&npa, pid) = SCARG(uap, pid);
123 SCARG(&npa, addr) = SCARG(uap, addr);
124 SCARG(&npa, data) = SCARG(uap, data);
125 return sys_ptrace(l, &npa, retval);
126 #endif
127 case FREEBSD_PT_TRACE_ME:
128 case FREEBSD_PT_READ_I:
129 case FREEBSD_PT_READ_D:
130 case FREEBSD_PT_WRITE_I:
131 case FREEBSD_PT_WRITE_D:
132 case FREEBSD_PT_CONTINUE:
133 case FREEBSD_PT_KILL:
134 /* These requests are compatible with NetBSD */
135 return sys_ptrace(l, (const void *)uap, retval);
136
137 #if 0
138 /*
139 * XXX: I've commented out this code, it is broken on too many fronts to fix.
140 * 1) It is doing an unlocked read-modify-write cycle on process that
141 * I assume might be running!
142 * and in code that might sleep (due to a pagefault), never mind
143 * what happens on an SMP system
144 * 2) It accesses data in userspace without using copyin/out.
145 * 3) It all looks like a nasty hack that isn't likely to work.
146 * 4) It uses the stackgap.
147 * dsl June 2007
148 */
149 case FREEBSD_PT_READ_U:
150 case FREEBSD_PT_WRITE_U:
151 {
152 int error;
153 struct {
154 struct reg regs;
155 struct fpreg fpregs;
156 } *nrp;
157 struct freebsd_ptrace_reg fr;
158 sg = stackgap_init(p, 0);
159 nrp = stackgap_alloc(p, &sg, sizeof(*nrp));
160 #ifdef PT_GETREGS
161 SCARG(&npa, req) = PT_GETREGS;
162 SCARG(&npa, pid) = SCARG(uap, pid);
163 SCARG(&npa, addr) = (void *)&nrp->regs;
164 if ((error = sys_ptrace(l, &npa, retval)) != 0)
165 return error;
166 #endif
167 #ifdef PT_GETFPREGS
168 SCARG(&npa, req) = PT_GETFPREGS;
169 SCARG(&npa, pid) = SCARG(uap, pid);
170 SCARG(&npa, addr) = (void *)&nrp->fpregs;
171 if ((error = sys_ptrace(l, &npa, retval)) != 0)
172 return error;
173 #endif
174 netbsd_to_freebsd_ptrace_regs(&nrp->regs, &nrp->fpregs, &fr);
175 switch (SCARG(uap, req)) {
176 case FREEBSD_PT_READ_U:
177 return freebsd_ptrace_getregs(&fr, SCARG(uap, addr),
178 retval);
179
180 case FREEBSD_PT_WRITE_U:
181 error = freebsd_ptrace_setregs(&fr,
182 SCARG(uap, addr), SCARG(uap, data));
183 if (error)
184 return error;
185 freebsd_to_netbsd_ptrace_regs(&fr,
186 &nrp->regs, &nrp->fpregs);
187 #ifdef PT_SETREGS
188 SCARG(&npa, req) = PT_SETREGS;
189 SCARG(&npa, pid) = SCARG(uap, pid);
190 SCARG(&npa, addr) = (void *)&nrp->regs;
191 if ((error = sys_ptrace(l, &npa, retval)) != 0)
192 return error;
193 #endif
194 #ifdef PT_SETFPREGS
195 SCARG(&npa, req) = PT_SETFPREGS;
196 SCARG(&npa, pid) = SCARG(uap, pid);
197 SCARG(&npa, addr) = (void *)&nrp->fpregs;
198 if ((error = sys_ptrace(l, &npa, retval)) != 0)
199 return error;
200 #endif
201 return 0;
202 }
203 }
204 #endif
205
206 default: /* It was not a legal request. */
207 return (EINVAL);
208 }
209
210 #ifdef DIAGNOSTIC
211 panic("freebsd_ptrace: impossible");
212 #endif
213 #else
214 return (ENOSYS);
215 #endif /* PTRACE || _LKM */
216 }
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