kern_stub.c revision 1.9
1 /* $NetBSD: kern_stub.c,v 1.9 2008/05/01 00:20:12 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2007, 2008 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * Copyright (c) 1982, 1986, 1991, 1993 31 * The Regents of the University of California. All rights reserved. 32 * 33 * Redistribution and use in source and binary forms, with or without 34 * modification, are permitted provided that the following conditions 35 * are met: 36 * 1. Redistributions of source code must retain the above copyright 37 * notice, this list of conditions and the following disclaimer. 38 * 2. Redistributions in binary form must reproduce the above copyright 39 * notice, this list of conditions and the following disclaimer in the 40 * documentation and/or other materials provided with the distribution. 41 * 3. Neither the name of the University nor the names of its contributors 42 * may be used to endorse or promote products derived from this software 43 * without specific prior written permission. 44 * 45 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 46 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 47 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 48 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 49 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 50 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 51 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 52 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 53 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 54 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 55 * SUCH DAMAGE. 56 * 57 * @(#)subr_xxx.c 8.3 (Berkeley) 3/29/95 58 */ 59 60 /* 61 * Stubs for system calls and facilities not included in the system. 62 */ 63 64 #include <sys/cdefs.h> 65 __KERNEL_RCSID(0, "$NetBSD: kern_stub.c,v 1.9 2008/05/01 00:20:12 ad Exp $"); 66 67 #include "opt_ptrace.h" 68 #include "opt_ktrace.h" 69 70 #include <sys/param.h> 71 #include <sys/kernel.h> 72 #include <sys/proc.h> 73 #include <sys/signalvar.h> 74 #include <sys/syscallargs.h> 75 #include <sys/ktrace.h> 76 #include <sys/intr.h> 77 #include <sys/cpu.h> 78 79 /* 80 * Nonexistent system call-- signal process (may want to handle it). Flag 81 * error in case process won't see signal immediately (blocked or ignored). 82 */ 83 #ifndef PTRACE 84 __weak_alias(sys_ptrace,sys_nosys); 85 #endif /* PTRACE */ 86 87 /* 88 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 89 * but not kill the process: utrace() is a debugging feature. 90 */ 91 #ifndef KTRACE 92 __weak_alias(ktr_csw,nullop); /* Probes */ 93 __weak_alias(ktr_emul,nullop); 94 __weak_alias(ktr_geniov,nullop); 95 __weak_alias(ktr_genio,nullop); 96 __weak_alias(ktr_mibio,nullop); 97 __weak_alias(ktr_namei,nullop); 98 __weak_alias(ktr_namei2,nullop); 99 __weak_alias(ktr_psig,nullop); 100 __weak_alias(ktr_syscall,nullop); 101 __weak_alias(ktr_sysret,nullop); 102 __weak_alias(ktr_kuser,nullop); 103 __weak_alias(ktr_mmsg,nullop); 104 __weak_alias(ktr_mib,nullop); 105 __weak_alias(ktr_mool,nullop); 106 __weak_alias(ktr_execarg,nullop); 107 __weak_alias(ktr_execenv,nullop); 108 109 __weak_alias(sys_fktrace,sys_nosys); /* Syscalls */ 110 __weak_alias(sys_ktrace,sys_nosys); 111 __weak_alias(sys_utrace,sys_nosys); 112 113 int ktrace_on; /* Misc */ 114 __weak_alias(ktruser,enosys); 115 __weak_alias(ktr_point,nullop); 116 #endif /* KTRACE */ 117 118 /* 119 * Scheduler activations system calls. These need to remain until libc's 120 * major version is bumped. 121 */ 122 __strong_alias(sys_sa_register,sys_nosys); 123 __strong_alias(sys_sa_stacks,sys_nosys); 124 __strong_alias(sys_sa_enable,sys_nosys); 125 __strong_alias(sys_sa_setconcurrency,sys_nosys); 126 __strong_alias(sys_sa_yield,sys_nosys); 127 __strong_alias(sys_sa_preempt,sys_nosys); 128 __strong_alias(sys_sa_unblockyield,sys_nosys); 129 130 /* 131 * Stubs for architectures that do not support kernel preemption. 132 */ 133 #ifndef __HAVE_PREEMPTION 134 bool 135 cpu_kpreempt_enter(uintptr_t where, int s) 136 { 137 138 return false; 139 } 140 141 void 142 cpu_kpreempt_exit(uintptr_t where) 143 { 144 145 } 146 147 bool 148 cpu_kpreempt_disabled(void) 149 { 150 151 return true; 152 } 153 #else 154 # ifndef MULTIPROCESSOR 155 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 156 # endif 157 #endif /* !__HAVE_PREEMPTION */ 158 159 /* ARGSUSED */ 160 int 161 sys_nosys(struct lwp *l, const void *v, register_t *retval) 162 { 163 164 mutex_enter(proc_lock); 165 psignal(l->l_proc, SIGSYS); 166 mutex_exit(proc_lock); 167 return ENOSYS; 168 } 169 170 /* 171 * Unsupported device function (e.g. writing to read-only device). 172 */ 173 int 174 enodev(void) 175 { 176 177 return (ENODEV); 178 } 179 180 /* 181 * Unconfigured device function; driver not configured. 182 */ 183 int 184 enxio(void) 185 { 186 187 return (ENXIO); 188 } 189 190 /* 191 * Unsupported ioctl function. 192 */ 193 int 194 enoioctl(void) 195 { 196 197 return (ENOTTY); 198 } 199 200 /* 201 * Unsupported system function. 202 * This is used for an otherwise-reasonable operation 203 * that is not supported by the current system binary. 204 */ 205 int 206 enosys(void) 207 { 208 209 return (ENOSYS); 210 } 211 212 /* 213 * Return error for operation not supported 214 * on a specific object or file type. 215 */ 216 int 217 eopnotsupp(void) 218 { 219 220 return (EOPNOTSUPP); 221 } 222 223 /* 224 * Generic null operation, always returns success. 225 */ 226 /*ARGSUSED*/ 227 int 228 nullop(void *v) 229 { 230 231 return (0); 232 } 233
Indexes created Mon Sep 22 13:09:51 GMT 2025