1 /* $NetBSD: kern_stub.c,v 1.4 2007/08/27 13:33:45 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1982, 1986, 1991, 1993 38 * The Regents of the University of California. All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 * 64 * @(#)subr_xxx.c 8.3 (Berkeley) 3/29/95 65 */ 66 67 /* 68 * Stubs for system calls and facilities not included in the system. 69 */ 70 71 #include <sys/cdefs.h> 72 __KERNEL_RCSID(0, "$NetBSD: kern_stub.c,v 1.4 2007/08/27 13:33:45 dsl Exp $"); 73 74 #include "opt_ptrace.h" 75 #include "opt_ktrace.h" 76 77 #include <sys/param.h> 78 #include <sys/kernel.h> 79 #include <sys/proc.h> 80 #include <sys/signalvar.h> 81 #include <sys/syscallargs.h> 82 #include <sys/ktrace.h> 83 84 /* 85 * Nonexistent system call-- signal process (may want to handle it). Flag 86 * error in case process won't see signal immediately (blocked or ignored). 87 */ 88 #ifndef PTRACE 89 __weak_alias(sys_ptrace,sys_nosys); 90 #endif /* PTRACE */ 91 92 /* 93 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 94 * but not kill the process: utrace() is a debugging feature. 95 */ 96 #ifndef KTRACE 97 __weak_alias(ktr_csw,nullop); /* Probes */ 98 __weak_alias(ktr_emul,nullop); 99 __weak_alias(ktr_geniov,nullop); 100 __weak_alias(ktr_genio,nullop); 101 __weak_alias(ktr_mibio,nullop); 102 __weak_alias(ktr_namei,nullop); 103 __weak_alias(ktr_namei2,nullop); 104 __weak_alias(ktr_psig,nullop); 105 __weak_alias(ktr_syscall,nullop); 106 __weak_alias(ktr_sysret,nullop); 107 __weak_alias(ktr_kuser,nullop); 108 __weak_alias(ktr_mmsg,nullop); 109 __weak_alias(ktr_mib,nullop); 110 __weak_alias(ktr_mool,nullop); 111 __weak_alias(ktr_execarg,nullop); 112 __weak_alias(ktr_execenv,nullop); 113 114 __weak_alias(sys_fktrace,sys_nosys); /* Syscalls */ 115 __weak_alias(sys_ktrace,sys_nosys); 116 __weak_alias(sys_utrace,sys_nosys); 117 118 int ktrace_on; /* Misc */ 119 __weak_alias(ktruser,enosys); 120 __weak_alias(ktr_point,nullop); 121 #endif /* KTRACE */ 122 123 /* 124 * Scheduler activations system calls. These need to remain until libc's 125 * major version is bumped. 126 */ 127 __strong_alias(sys_sa_register,sys_nosys); 128 __strong_alias(sys_sa_stacks,sys_nosys); 129 __strong_alias(sys_sa_enable,sys_nosys); 130 __strong_alias(sys_sa_setconcurrency,sys_nosys); 131 __strong_alias(sys_sa_yield,sys_nosys); 132 __strong_alias(sys_sa_preempt,sys_nosys); 133 __strong_alias(sys_sa_unblockyield,sys_nosys); 134 135 /* ARGSUSED */ 136 int 137 sys_nosys(struct lwp *l, void *v, register_t *retval) 138 { 139 140 mutex_enter(&proclist_mutex); 141 psignal(l->l_proc, SIGSYS); 142 mutex_exit(&proclist_mutex); 143 return ENOSYS; 144 } 145 146 /* 147 * Unsupported device function (e.g. writing to read-only device). 148 */ 149 int 150 enodev(void) 151 { 152 153 return (ENODEV); 154 } 155 156 /* 157 * Unconfigured device function; driver not configured. 158 */ 159 int 160 enxio(void) 161 { 162 163 return (ENXIO); 164 } 165 166 /* 167 * Unsupported ioctl function. 168 */ 169 int 170 enoioctl(void) 171 { 172 173 return (ENOTTY); 174 } 175 176 /* 177 * Unsupported system function. 178 * This is used for an otherwise-reasonable operation 179 * that is not supported by the current system binary. 180 */ 181 int 182 enosys(void) 183 { 184 185 return (ENOSYS); 186 } 187 188 /* 189 * Return error for operation not supported 190 * on a specific object or file type. 191 */ 192 int 193 eopnotsupp(void) 194 { 195 196 return (EOPNOTSUPP); 197 } 198 199 /* 200 * Generic null operation, always returns success. 201 */ 202 /*ARGSUSED*/ 203 int 204 nullop(void *v) 205 { 206 207 return (0); 208 } 209