1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
/* $NetBSD: linux32_exec.c,v 1.19 2009/10/25 01:14:03 rmind Exp $ */
/*-
* Copyright (c) 1994-2007 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz,
* Thor Lancelot Simon, and Emmanuel Dreyfus.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: linux32_exec.c,v 1.19 2009/10/25 01:14:03 rmind Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/malloc.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/mman.h>
#include <sys/syscallargs.h>
#include <sys/ptrace.h> /* For proc_reparent() */
#include <uvm/uvm_extern.h>
#include <sys/cpu.h>
#include <machine/reg.h>
#include <compat/linux/common/linux_types.h>
#include <compat/linux/common/linux_emuldata.h>
#include <compat/linux32/common/linux32_exec.h>
#include <compat/linux32/common/linux32_types.h>
#include <compat/linux32/common/linux32_signal.h>
#include <compat/linux32/common/linux32_machdep.h>
#include <compat/linux32/linux32_syscallargs.h>
#include <compat/linux32/linux32_syscall.h>
extern char linux32_sigcode[1];
extern char linux32_rt_sigcode[1];
extern char linux32_esigcode[1];
extern struct sysent linux32_sysent[];
extern const char * const linux32_syscallnames[];
static void linux32_e_proc_exec(struct proc *, struct exec_package *);
static void linux32_e_proc_fork(struct proc *, struct proc *, int);
static void linux32_e_proc_exit(struct proc *);
static void linux32_e_proc_init(struct proc *, struct proc *, int);
#ifdef LINUX32_NPTL
void linux32_userret(void);
void linux_nptl_proc_fork(struct proc *, struct proc *, void (*luserret)(void));
void linux_nptl_proc_exit(struct proc *);
void linux_nptl_proc_init(struct proc *, struct proc *);
#endif
/*
* Emulation switch.
*/
struct uvm_object *emul_linux32_object;
struct emul emul_linux32 = {
.e_name = "linux32",
.e_path = "/emul/linux32",
#ifndef __HAVE_MINIMAL_EMUL
.e_flags = 0,
.e_errno = NULL,
.e_nosys = LINUX32_SYS_syscall,
.e_nsysent = LINUX32_SYS_NSYSENT,
#endif
.e_sysent = linux32_sysent,
.e_syscallnames = linux32_syscallnames,
.e_sendsig = linux32_sendsig,
.e_trapsignal = trapsignal,
.e_tracesig = NULL,
.e_sigcode = linux32_sigcode,
.e_esigcode = linux32_esigcode,
.e_sigobject = &emul_linux32_object,
.e_setregs = linux32_setregs,
.e_proc_exec = linux32_e_proc_exec,
.e_proc_fork = linux32_e_proc_fork,
.e_proc_exit = linux32_e_proc_exit,
.e_lwp_fork = NULL,
.e_lwp_exit = NULL,
.e_syscall_intern = linux32_syscall_intern,
.e_sysctlovly = NULL,
.e_fault = NULL,
.e_vm_default_addr = netbsd32_vm_default_addr,
.e_usertrap = NULL,
.e_sa = NULL,
.e_ucsize = 0,
.e_startlwp = NULL
};
static void
linux32_e_proc_init(struct proc *p, struct proc *parent, int forkflags)
{
struct linux_emuldata *e = p->p_emuldata;
struct linux_emuldata_shared *s;
struct linux_emuldata *ep = NULL;
if (!e) {
/* allocate new Linux emuldata */
e = malloc(sizeof(struct linux_emuldata),
M_EMULDATA, M_WAITOK);
} else {
mutex_enter(proc_lock);
e->s->refs--;
if (e->s->refs == 0)
free(e->s, M_EMULDATA);
mutex_exit(proc_lock);
}
memset(e, '\0', sizeof(struct linux_emuldata));
e->proc = p;
if (parent)
ep = parent->p_emuldata;
if (forkflags & FORK_SHAREVM) {
mutex_enter(proc_lock);
#ifdef DIAGNOSTIC
if (ep == NULL) {
killproc(p, "FORK_SHAREVM while emuldata is NULL\n");
mutex_exit(proc_lock);
return;
}
#endif
s = ep->s;
s->refs++;
} else {
struct vmspace *vm;
s = malloc(sizeof(struct linux_emuldata_shared),
M_EMULDATA, M_WAITOK);
s->refs = 1;
/*
* Set the process idea of the break to the real value.
* For fork, we use parent's vmspace since our's
* is not setup at the time of this call and is going
* to be copy of parent's anyway. For exec, just
* use our own vmspace.
*/
vm = (parent) ? parent->p_vmspace : p->p_vmspace;
s->p_break = (char *)vm->vm_daddr + ctob(vm->vm_dsize);
/*
* Linux threads are emulated as NetBSD processes (not lwp)
* We use native PID for Linux TID. The Linux TID is the
* PID of the first process in the group. It is stored
* here
*/
s->group_pid = p->p_pid;
/*
* Initialize the list of threads in the group
*/
LIST_INIT(&s->threads);
s->xstat = 0;
s->flags = 0;
mutex_enter(proc_lock);
}
e->s = s;
/*
* Add this thread in the group thread list
*/
LIST_INSERT_HEAD(&s->threads, e, threads);
mutex_exit(proc_lock);
#ifdef LINUX32_NPTL
linux_nptl_proc_init(p, parent);
#endif /* LINUX32_NPTL */
p->p_emuldata = e;
}
/*
* Allocate new per-process structures. Called when executing Linux
* process. We can reuse the old emuldata - if it's not null,
* the executed process is of same emulation as original forked one.
*/
static void
linux32_e_proc_exec(struct proc *p, struct exec_package *epp)
{
/* exec, use our vmspace */
linux32_e_proc_init(p, NULL, 0);
}
/*
* Emulation per-process exit hook.
*/
static void
linux32_e_proc_exit(struct proc *p)
{
struct linux_emuldata *e = p->p_emuldata;
#ifdef LINUX32_NPTL
linux_nptl_proc_exit(p);
#endif /* LINUX32_NPTL */
/* Remove the thread for the group thread list */
mutex_enter(proc_lock);
LIST_REMOVE(e, threads);
/* free Linux emuldata and set the pointer to null */
e->s->refs--;
if (e->s->refs == 0)
free(e->s, M_EMULDATA);
p->p_emuldata = NULL;
mutex_exit(proc_lock);
free(e, M_EMULDATA);
}
/*
* Emulation fork hook.
*/
static void
linux32_e_proc_fork(struct proc *p, struct proc *parent, int forkflags)
{
/*
* The new process might share some vmspace-related stuff
* with parent, depending on fork flags (CLONE_VM et.al).
* Force allocation of new base emuldata, and share the
* VM-related parts only if necessary.
*/
p->p_emuldata = NULL;
linux32_e_proc_init(p, parent, forkflags);
#ifdef LINUX32_NPTL
linux_nptl_proc_fork(p, parent, linux32_userret);
#endif
return;
}
#ifdef LINUX32_NPTL
void
linux32_userret(void)
{
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct linux_emuldata *led = p->p_emuldata;
int error;
/* LINUX_CLONE_CHILD_SETTID: copy child's TID to child's memory */
if (led->clone_flags & LINUX_CLONE_CHILD_SETTID) {
if ((error = copyout(&l->l_proc->p_pid,
led->child_tidptr, sizeof(l->l_proc->p_pid))) != 0)
printf("linux32_userret: LINUX_CLONE_CHILD_SETTID "
"failed (led->child_tidptr = %p, p->p_pid = %d)\n",
led->child_tidptr, p->p_pid);
}
/* LINUX_CLONE_SETTLS: allocate a new TLS */
if (led->clone_flags & LINUX_CLONE_SETTLS) {
if (linux32_set_newtls(l, linux32_get_newtls(l)) != 0)
printf("linux32_userret: linux32_set_tls failed");
}
return;
}
#endif /* LINUX32_NPTL */
|