1 /* $NetBSD: netbsd32_compat_16.c,v 1.10 2025/02/28 18:35:44 wiz Exp $ */
2
3 /*-
4 * Copyright (c) 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.
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 #include <sys/cdefs.h>
32 __KERNEL_RCSID(0, "$NetBSD: netbsd32_compat_16.c,v 1.10 2025/02/28 18:35:44 wiz Exp $");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/module.h>
37 #include <sys/dirent.h>
38 #include <sys/exec.h>
39 #include <sys/proc.h>
40 #include <sys/lwp.h>
41 #include <sys/syscallargs.h>
42 #include <sys/syscallvar.h>
43
44 #include <compat/netbsd32/netbsd32.h>
45 #include <compat/netbsd32/netbsd32_syscall.h>
46 #include <compat/netbsd32/netbsd32_syscallargs.h>
47 #include <compat/netbsd32/netbsd32_conv.h>
48
49 struct uvm_object *emul_netbsd32_object;
50
51 #if defined(__amd64__) || defined(__arm__) || defined(__mips__) || defined(__sparc64__)
52 #define __HAVE_MD_NETBSD32_SIGRETURN14
53 #endif
54
55 #if defined(__amd64__) || defined(__arm__) || defined(__mips__) || defined(__powerpc__) || defined(__riscv__)
56 #define __HAVE_MD_NETBSD32_SIGCODE
57 #endif
58
59
60 #ifdef __HAVE_MD_NETBSD32_SIGRETURN14
61 static const struct syscall_package netbsd32_kern_sig_16_syscalls[] = {
62 /* compat_16_netbsd32___sigreturn14 is in MD code! */
63 { NETBSD32_SYS_compat_16_netbsd32___sigreturn14, 0,
64 (sy_call_t *)compat_16_netbsd32___sigreturn14 },
65 { 0, 0, NULL }
66 };
67 #endif
68
69 static int
compat_netbsd32_16_init(void)70 compat_netbsd32_16_init(void)
71 {
72 #if defined(__HAVE_MD_NETBSD32_SIGRETURN14) || defined(__HAVE_MD_NETBSD32_SIGCODE)
73 int error;
74 #endif
75
76 #ifdef __HAVE_MD_NETBSD32_SIGRETURN14
77 error = syscall_establish(&emul_netbsd32,
78 netbsd32_kern_sig_16_syscalls);
79 if (error)
80 return error;
81 #endif
82
83 #ifdef __HAVE_MD_NETBSD32_SIGCODE
84 rw_enter(&exec_lock, RW_WRITER);
85 emul_netbsd32.e_sigcode = netbsd32_sigcode;
86 emul_netbsd32.e_esigcode = netbsd32_esigcode;
87 emul_netbsd32.e_sigobject = &emul_netbsd32_object;
88 error = exec_sigcode_alloc(&emul_netbsd);
89 if (error) {
90 emul_netbsd32.e_sigcode = NULL;
91 emul_netbsd32.e_esigcode = NULL;
92 emul_netbsd32.e_sigobject = NULL;
93 }
94 rw_exit(&exec_lock);
95 if (error)
96 return error;
97 netbsd32_machdep_md_16_init();
98 #endif
99 return 0;
100 }
101
102 static int
compat_netbsd32_16_fini(void)103 compat_netbsd32_16_fini(void)
104 {
105 #if defined(__HAVE_MD_NETBSD32_SIGRETURN14)
106 proc_t *p;
107 int error;
108 #endif
109
110 #ifdef __HAVE_MD_NETBSD32_SIGRETURN14
111 error = syscall_disestablish(&emul_netbsd32,
112 netbsd32_kern_sig_16_syscalls);
113 if (error)
114 return error;
115 /*
116 * Ensure sendsig_sigcontext() is not being used.
117 * module_lock prevents the flag being set on any
118 * further processes while we are here. See
119 * sigaction1() for the opposing half.
120 */
121 mutex_enter(&proc_lock);
122 PROCLIST_FOREACH(p, &allproc) {
123 if ((p->p_lflag & PL_SIGCOMPAT) != 0) {
124 break;
125 }
126 }
127 mutex_exit(&proc_lock);
128 if (p != NULL) {
129 syscall_establish(&emul_netbsd32,
130 netbsd32_kern_sig_16_syscalls);
131 return EBUSY;
132 }
133 #endif
134
135 #ifdef __HAVE_MD_NETBSD32_SIGCODE
136 rw_enter(&exec_lock, RW_WRITER);
137 exec_sigcode_free(&emul_netbsd);
138 emul_netbsd32.e_sigcode = NULL;
139 emul_netbsd32.e_esigcode = NULL;
140 emul_netbsd32.e_sigobject = NULL;
141 rw_exit(&exec_lock);
142 netbsd32_machdep_md_16_fini();
143 #endif
144 return 0;
145 }
146
147 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_16, "compat_netbsd32_20,compat_16");
148
149 static int
compat_netbsd32_16_modcmd(modcmd_t cmd,void * arg)150 compat_netbsd32_16_modcmd(modcmd_t cmd, void *arg)
151 {
152 switch (cmd) {
153 case MODULE_CMD_INIT:
154 return compat_netbsd32_16_init();
155
156 case MODULE_CMD_FINI:
157 return compat_netbsd32_16_fini();
158
159 default:
160 return ENOTTY;
161 }
162 }
163