1/* $NetBSD: linux_exec.c,v 1.117 2014/11/09 17:48:08 maxv Exp $ */
2
3/*-
4 * Copyright (c) 1994, 1995, 1998, 2000, 2007, 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and
9 * Thor Lancelot Simon.
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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__KERNEL_RCSID(0, "$NetBSD: linux_exec.c,v 1.117 2014/11/09 17:48:08 maxv Exp $");
35
36#include <sys/param.h>
37#include <sys/systm.h>
38#include <sys/kernel.h>
39#include <sys/proc.h>
40#include <sys/namei.h>
41#include <sys/vnode.h>
42#include <sys/mount.h>
43#include <sys/exec.h>
44#include <sys/exec_elf.h>
45
46#include <sys/mman.h>
47#include <sys/syscallargs.h>
48
49#include <sys/ptrace.h> /* For proc_reparent() */
50
51#include <uvm/uvm_extern.h>
52
53#include <sys/cpu.h>
54#include <machine/reg.h>
55
56#include <compat/linux/common/linux_types.h>
57#include <compat/linux/common/linux_signal.h>
58#include <compat/linux/common/linux_util.h>
59#include <compat/linux/common/linux_sched.h>
60#include <compat/linux/common/linux_machdep.h>
61#include <compat/linux/common/linux_exec.h>
62#include <compat/linux/common/linux_futex.h>
63#include <compat/linux/common/linux_ipc.h>
64#include <compat/linux/common/linux_sem.h>
65
66#include <compat/linux/linux_syscallargs.h>
67#include <compat/linux/linux_syscall.h>
68#include <compat/linux/common/linux_misc.h>
69#include <compat/linux/common/linux_errno.h>
70#include <compat/linux/common/linux_emuldata.h>
71
72extern struct sysent linux_sysent[];
73extern const char * const linux_syscallnames[];
74extern char linux_sigcode[], linux_esigcode[];
75
76/*
77 * Emulation switch.
78 */
79
80struct uvm_object *emul_linux_object;
81
82struct emul emul_linux = {
83 .e_name = "linux",
84 .e_path = "/emul/linux",
85#ifndef __HAVE_MINIMAL_EMUL
86 .e_flags = 0,
87 .e_errno = native_to_linux_errno,
88 .e_nosys = LINUX_SYS_syscall,
89 .e_nsysent = LINUX_SYS_NSYSENT,
90#endif
91 .e_sysent = linux_sysent,
92 .e_syscallnames = linux_syscallnames,
93 .e_sendsig = linux_sendsig,
94 .e_trapsignal = linux_trapsignal,
95 .e_tracesig = NULL,
96 .e_sigcode = linux_sigcode,
97 .e_esigcode = linux_esigcode,
98 .e_sigobject = &emul_linux_object,
99 .e_setregs = linux_setregs,
100 .e_proc_exec = linux_e_proc_exec,
101 .e_proc_fork = linux_e_proc_fork,
102 .e_proc_exit = linux_e_proc_exit,
103 .e_lwp_fork = linux_e_lwp_fork,
104 .e_lwp_exit = linux_e_lwp_exit,
105#ifdef __HAVE_SYSCALL_INTERN
106 .e_syscall_intern = linux_syscall_intern,
107#else
108#error Implement __HAVE_SYSCALL_INTERN for this platform
109#endif
110 .e_sysctlovly = NULL,
111 .e_fault = NULL,
112 .e_vm_default_addr = uvm_default_mapaddr,
113 .e_usertrap = linux_usertrap,
114 .e_ucsize = 0,
115 .e_startlwp = NULL
116};
117
118void
119linux_e_proc_exec(struct proc *p, struct exec_package *epp)
120{
121 struct lwp *l;
122
123 l = LIST_FIRST(&p->p_lwps);
124 if (l->l_emuldata == NULL) {
125 l->l_emuldata = kmem_zalloc(sizeof(struct linux_emuldata), KM_SLEEP);
126 } else {
127 memset(l->l_emuldata, 0, sizeof (struct linux_emuldata));
128 }
129
130 KASSERT(p->p_nlwps == 1);
131 l = LIST_FIRST(&p->p_lwps);
132 mutex_enter(p->p_lock);
133 l->l_lid = p->p_pid;
134 mutex_exit(p->p_lock);
135}
136
137void
138linux_e_proc_exit(struct proc *p)
139{
140 struct lwp *l;
141
142 KASSERT(p->p_nlwps == 1);
143 l = LIST_FIRST(&p->p_lwps);
144 linux_e_lwp_exit(l);
145}
146
147void
148linux_e_proc_fork(struct proc *p2, struct lwp *l1, int flags)
149{
150 struct linux_emuldata *led1, *led2;
151 struct lwp *l2;
152
153 KASSERT(p2->p_nlwps == 1);
154 l2 = LIST_FIRST(&p2->p_lwps);
155 l2->l_lid = p2->p_pid;
156 led1 = l1->l_emuldata;
157 led2 = l2->l_emuldata;
158 led2->led_child_tidptr = led1->led_child_tidptr;
159}
160
161void
162linux_e_lwp_fork(struct lwp *l1, struct lwp *l2)
163{
164 struct linux_emuldata *led2;
165
166 led2 = kmem_zalloc(sizeof(*led2), KM_SLEEP);
167 l2->l_emuldata = led2;
168}
169
170void
171linux_e_lwp_exit(struct lwp *l)
172{
173 struct linux_emuldata *led;
174 struct linux_sys_futex_args cup;
175 register_t retval;
176 int error, zero = 0;
177
178 led = l->l_emuldata;
179 if (led->led_clear_tid == NULL) {
180 return;
181 }
182
183 /* Emulate LINUX_CLONE_CHILD_CLEARTID */
184 error = copyout(&zero, led->led_clear_tid, sizeof(zero));
185#ifdef DEBUG_LINUX
186 if (error != 0)
187 printf("%s: cannot clear TID\n", __func__);
188#endif
189
190 SCARG(&cup, uaddr) = led->led_clear_tid;
191 SCARG(&cup, op) = LINUX_FUTEX_WAKE;
192 SCARG(&cup, val) = 0x7fffffff; /* Awake everyone */
193 SCARG(&cup, timeout) = NULL;
194 SCARG(&cup, uaddr2) = NULL;
195 SCARG(&cup, val3) = 0;
196 if ((error = linux_sys_futex(curlwp, &cup, &retval)) != 0)
197 printf("%s: linux_sys_futex failed\n", __func__);
198
199 release_futexes(l);
200
201 led = l->l_emuldata;
202 l->l_emuldata = NULL;
203 kmem_free(led, sizeof(*led));
204}
205