1/*	$NetBSD: linux32_mod.c,v 1.15 2021/11/25 02:38:56 ryo Exp $	*/
2
3/*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software developed for The NetBSD Foundation
8 * by Andrew Doran.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: linux32_mod.c,v 1.15 2021/11/25 02:38:56 ryo Exp $");
34
35#ifdef _KERNEL_OPT
36#include "opt_execfmt.h"
37#endif
38
39#ifndef ELFSIZE
40#define ELFSIZE ARCH_ELFSIZE
41#endif
42
43#include <sys/param.h>
44#include <sys/module.h>
45#include <sys/exec.h>
46#include <sys/signalvar.h>
47#include <sys/sysctl.h>
48
49#include <compat/linux/common/linux_exec.h>
50
51#include <compat/linux32/common/linux32_sysctl.h>
52#include <compat/linux32/common/linux32_exec.h>
53
54#if defined(EXEC_ELF32)
55# define       MD1     ",exec_elf32,compat_netbsd32,compat_netbsd32_sysvipc"
56#else
57# define       MD1     ""
58#endif
59
60#define	REQ1	"compat_linux,sysv_ipc,compat_sysv_50"
61#define	REQ2	",compat_netbsd32_50,compat_netbsd32_43"
62
63MODULE(MODULE_CLASS_EXEC, compat_linux32, REQ1 REQ2 MD1);
64
65static struct execsw linux32_execsw[] = {
66#if defined(EXEC_ELF32)
67	{
68		.es_hdrsz = sizeof (Elf32_Ehdr),
69		.es_makecmds = exec_elf32_makecmds,
70		.u = {
71			.elf_probe_func = linux32_elf32_probe,
72		},
73		.es_emul = &emul_linux32,
74		.es_prio = EXECSW_PRIO_ANY,
75		.es_arglen = LINUX32_ELF_AUX_ARGSIZ,
76		.es_copyargs = linux32_elf32_copyargs,
77		.es_setregs = NULL,
78		.es_coredump = coredump_elf32,
79		.es_setup_stack = linux32_exec_setup_stack,
80	},
81#endif
82};
83
84int linux32_enabled = 1;
85
86int
87linux32_sysctl_enable(SYSCTLFN_ARGS)
88{
89	struct sysctlnode node;
90	int error, val;
91
92	val = *(int *)rnode->sysctl_data;
93
94	node = *rnode;
95	node.sysctl_data = &val;
96
97	error = sysctl_lookup(SYSCTLFN_CALL(&node));
98	if (error != 0 || newp == NULL)
99		return error;
100
101	if (val == *(int *)rnode->sysctl_data)
102		return 0;
103
104	if (val == 1)
105		error = exec_add(linux32_execsw, __arraycount(linux32_execsw));
106	else if (val == 0)
107		error =
108		    exec_remove(linux32_execsw, __arraycount(linux32_execsw));
109	else
110		error = EINVAL;
111
112	if (error)
113		return error;
114
115	*(int *)rnode->sysctl_data = val;
116
117	return 0;
118}
119
120static int
121compat_linux32_modcmd(modcmd_t cmd, void *arg)
122{
123	int error;
124
125	switch (cmd) {
126	case MODULE_CMD_INIT:
127		error = exec_add(linux32_execsw, __arraycount(linux32_execsw));
128		return error;
129
130	case MODULE_CMD_FINI:
131		error =
132		    exec_remove(linux32_execsw, __arraycount(linux32_execsw));
133		if (error)
134			return error;
135		linux32_sysctl_fini();
136		return 0;
137
138	default:
139		return ENOTTY;
140	}
141}
142