1 /* $NetBSD: netbsd32_compat_16.c,v 1.6 2024/08/18 18:42:57 riastradh 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 1.6 2024/08/18 18:42:57 riastradh 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 static const struct syscall_package netbsd32_kern_sig_16_syscalls[] = { 52 /* compat_16_netbs32___sigreturn14 is in MD code! */ 53 { NETBSD32_SYS_compat_16_netbsd32___sigreturn14, 0, 54 (sy_call_t *)compat_16_netbsd32___sigreturn14 }, 55 { 0, 0, NULL } 56 }; 57 58 static int 59 compat_netbsd32_16_init(void) 60 { 61 int error; 62 63 error = syscall_establish(&emul_netbsd32, 64 netbsd32_kern_sig_16_syscalls); 65 if (error) 66 return error; 67 68 rw_enter(&exec_lock, RW_WRITER); 69 emul_netbsd32.e_sigcode = netbsd32_sigcode; 70 emul_netbsd32.e_esigcode = netbsd32_esigcode; 71 emul_netbsd32.e_sigobject = &emul_netbsd32_object; 72 error = exec_sigcode_alloc(&emul_netbsd); 73 if (error) { 74 emul_netbsd32.e_sigcode = NULL; 75 emul_netbsd32.e_esigcode = NULL; 76 emul_netbsd32.e_sigobject = NULL; 77 } 78 rw_exit(&exec_lock); 79 if (error) 80 return error; 81 netbsd32_machdep_md_16_init(); 82 return 0; 83 } 84 85 static int 86 compat_netbsd32_16_fini(void) 87 { 88 proc_t *p; 89 int error; 90 91 error = syscall_disestablish(&emul_netbsd32, 92 netbsd32_kern_sig_16_syscalls); 93 if (error) 94 return error; 95 /* 96 * Ensure sendsig_sigcontext() is not being used. 97 * module_lock prevents the flag being set on any 98 * further processes while we are here. See 99 * sigaction1() for the opposing half. 100 */ 101 mutex_enter(&proc_lock); 102 PROCLIST_FOREACH(p, &allproc) { 103 if ((p->p_lflag & PL_SIGCOMPAT) != 0) { 104 break; 105 } 106 } 107 mutex_exit(&proc_lock); 108 if (p != NULL) { 109 syscall_establish(&emul_netbsd32, 110 netbsd32_kern_sig_16_syscalls); 111 return EBUSY; 112 } 113 114 rw_enter(&exec_lock, RW_WRITER); 115 exec_sigcode_free(&emul_netbsd); 116 emul_netbsd32.e_sigcode = NULL; 117 emul_netbsd32.e_esigcode = NULL; 118 emul_netbsd32.e_sigobject = NULL; 119 rw_exit(&exec_lock); 120 netbsd32_machdep_md_16_fini(); 121 return 0; 122 } 123 124 MODULE(MODULE_CLASS_EXEC, compat_netbsd32_16, "compat_netbsd32_20,compat_16"); 125 126 static int 127 compat_netbsd32_16_modcmd(modcmd_t cmd, void *arg) 128 { 129 switch (cmd) { 130 case MODULE_CMD_INIT: 131 return compat_netbsd32_16_init(); 132 133 case MODULE_CMD_FINI: 134 return compat_netbsd32_16_fini(); 135 136 default: 137 return ENOTTY; 138 } 139 } 140