1 /* $NetBSD: netbsd32_compat_16.c,v 1.7 2024/11/22 10:41:50 mlelstv 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 1.7 2024/11/22 10:41:50 mlelstv 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(__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 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 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 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