1 /* $NetBSD: netbsd32_mod.c,v 1.23 2020/08/08 19:08:48 christos 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 /*
33 * Copyright (c) 1998, 2000, 2017 The NetBSD Foundation, Inc.
34 * All rights reserved.
35 *
36 * This code is derived from software contributed to The NetBSD Foundation
37 * by Charles M. Hannum, and by Maxime Villard.
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 * 1. Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
49 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
50 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
51 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
52 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
53 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
54 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
55 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
56 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
57 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
58 * POSSIBILITY OF SUCH DAMAGE.
59 */
60
61 #include <sys/cdefs.h>
62 __KERNEL_RCSID(0, "$NetBSD: netbsd32_mod.c,v 1.23 2020/08/08 19:08:48 christos Exp $");
63
64 #ifdef _KERNEL_OPT
65 #include "opt_execfmt.h"
66 #endif
67
68 #ifndef ELFSIZE
69 #define ELFSIZE ARCH_ELFSIZE
70 #endif
71
72 #include <sys/param.h>
73 #include <sys/module.h>
74 #include <sys/exec.h>
75 #include <sys/exec_elf.h>
76 #include <sys/module_hook.h>
77 #include <sys/compat_stub.h>
78
79 #include <compat/netbsd32/netbsd32_sysctl.h>
80 #include <compat/netbsd32/netbsd32_kern_proc.h>
81 #include <compat/netbsd32/netbsd32_exec.h>
82
83 #define ELF32_AUXSIZE (howmany(ELF_AUX_ENTRIES * sizeof(Aux32Info), \
84 sizeof(Elf32_Addr)) + MAXPATHLEN + ALIGN(1))
85
86 struct compat32_80_modctl_hook_t compat32_80_modctl_hook;
87
88 # define DEPS1 "ksem,compat_util"
89
90 #if defined(EXEC_ELF32)
91 # define DEPS2 ",exec_elf32"
92 #else
93 # define DEPS2 ""
94 #endif
95
96 MODULE(MODULE_CLASS_EXEC, compat_netbsd32, DEPS1 DEPS2);
97
98 static struct execsw netbsd32_execsw[] = {
99 #ifdef EXEC_AOUT
100 {
101 .es_hdrsz = sizeof(struct netbsd32_exec),
102 .es_makecmds = exec_netbsd32_makecmds,
103 .u = {
104 .elf_probe_func = NULL,
105 },
106 .es_emul = &emul_netbsd32,
107 .es_prio = EXECSW_PRIO_FIRST,
108 .es_arglen = 0,
109 .es_copyargs = netbsd32_copyargs,
110 .es_setregs = NULL,
111 .es_coredump = coredump_netbsd32,
112 .es_setup_stack = exec_setup_stack,
113 },
114 #endif
115 #ifdef EXEC_ELF32
116 {
117 .es_hdrsz = sizeof (Elf32_Ehdr),
118 .es_makecmds = exec_elf32_makecmds,
119 .u = {
120 .elf_probe_func = netbsd32_elf32_probe,
121 },
122 .es_emul = &emul_netbsd32,
123 .es_prio = EXECSW_PRIO_ANY,
124 .es_arglen = ELF32_AUXSIZE,
125 .es_copyargs = netbsd32_elf32_copyargs,
126 .es_setregs = NULL,
127 .es_coredump = coredump_elf32,
128 .es_setup_stack = exec_setup_stack,
129 },
130 #endif
131 };
132
133 #if defined(__amd64__)
134 #include <x86/cpu.h>
135
136 /* This code was moved here, from $SRC/arch/amd64/amd64/trap.c */
137
138 static int
amd64_oosyscall_handle(struct proc * p,struct trapframe * frame)139 amd64_oosyscall_handle(struct proc *p, struct trapframe *frame)
140 {
141 int error = EPASSTHROUGH;
142 #define LCALLSZ 7
143
144 /* Check for the oosyscall lcall instruction. */
145 if (p->p_emul == &emul_netbsd32 &&
146 frame->tf_rip < VM_MAXUSER_ADDRESS32 - LCALLSZ &&
147 (error = x86_cpu_is_lcall((void *)frame->tf_rip)) == 0)
148 {
149 /* Advance past the lcall and save instruction size. */
150 frame->tf_rip += LCALLSZ;
151 frame->tf_err = LCALLSZ;
152 return 0;
153 }
154
155 return error;
156 }
157 #endif /* defined(__amd64__) */
158
159 static int
compat_netbsd32_modcmd(modcmd_t cmd,void * arg)160 compat_netbsd32_modcmd(modcmd_t cmd, void *arg)
161 {
162 int error;
163
164 switch (cmd) {
165 case MODULE_CMD_INIT:
166 error = exec_add(netbsd32_execsw,
167 __arraycount(netbsd32_execsw));
168 if (error == 0) {
169 netbsd32_machdep_md_init();
170 netbsd32_kern_proc_32_init();
171 #if defined(__amd64__)
172 MODULE_HOOK_SET(amd64_oosyscall_hook,
173 amd64_oosyscall_handle);
174 #endif /* defined(__amd64__) */
175 }
176 return error;
177
178 case MODULE_CMD_FINI:
179 #if defined(__amd64__)
180 MODULE_HOOK_UNSET(amd64_oosyscall_hook);
181 #endif /* defined(__amd64__) */
182 netbsd32_machdep_md_fini();
183 netbsd32_sysctl_fini();
184 netbsd32_kern_proc_32_fini();
185
186 error = exec_remove(netbsd32_execsw,
187 __arraycount(netbsd32_execsw));
188 if (error) {
189 netbsd32_kern_proc_32_init();
190 netbsd32_machdep_md_init();
191 #if defined(__amd64__)
192 MODULE_HOOK_SET(amd64_oosyscall_hook,
193 amd64_oosyscall_handle);
194 #endif /* defined(__amd64__) */
195 }
196 return error;
197
198 default:
199 return ENOTTY;
200 }
201 }
202