kern_stub.c revision 1.11.8.1
1 /* $NetBSD: kern_stub.c,v 1.11.8.1 2011/02/05 06:00:14 cliff 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 1.11.8.1 2011/02/05 06:00:14 cliff Exp $"); 66 67 #include "opt_multiprocessor.h" 68 #include "opt_ptrace.h" 69 #include "opt_ktrace.h" 70 #include "opt_sa.h" 71 72 #include <sys/param.h> 73 #include <sys/kernel.h> 74 #include <sys/proc.h> 75 #include <sys/signalvar.h> 76 #include <sys/syscallargs.h> 77 #include <sys/ktrace.h> 78 #include <sys/intr.h> 79 #include <sys/cpu.h> 80 81 /* 82 * Nonexistent system call-- signal process (may want to handle it). Flag 83 * error in case process won't see signal immediately (blocked or ignored). 84 */ 85 #ifndef PTRACE 86 __weak_alias(sys_ptrace,sys_nosys); 87 #endif /* PTRACE */ 88 89 /* 90 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 91 * but not kill the process: utrace() is a debugging feature. 92 */ 93 #ifndef KTRACE 94 __weak_alias(ktr_csw,nullop); /* Probes */ 95 __weak_alias(ktr_emul,nullop); 96 __weak_alias(ktr_geniov,nullop); 97 __weak_alias(ktr_genio,nullop); 98 __weak_alias(ktr_mibio,nullop); 99 __weak_alias(ktr_namei,nullop); 100 __weak_alias(ktr_namei2,nullop); 101 __weak_alias(ktr_psig,nullop); 102 __weak_alias(ktr_saupcall,nullop); 103 __weak_alias(ktr_syscall,nullop); 104 __weak_alias(ktr_sysret,nullop); 105 __weak_alias(ktr_kuser,nullop); 106 __weak_alias(ktr_mmsg,nullop); 107 __weak_alias(ktr_mib,nullop); 108 __weak_alias(ktr_mool,nullop); 109 __weak_alias(ktr_execarg,nullop); 110 __weak_alias(ktr_execenv,nullop); 111 112 __weak_alias(sys_fktrace,sys_nosys); /* Syscalls */ 113 __weak_alias(sys_ktrace,sys_nosys); 114 __weak_alias(sys_utrace,sys_nosys); 115 116 int ktrace_on; /* Misc */ 117 __weak_alias(ktruser,enosys); 118 __weak_alias(ktr_point,nullop); 119 #endif /* KTRACE */ 120 121 /* 122 * Scheduler activations system calls. These need to remain, even when 123 * KERN_SA isn't defined, until libc's major version is bumped. 124 */ 125 #if !defined(KERN_SA) 126 __strong_alias(sys_sa_register,sys_nosys); 127 __strong_alias(sys_sa_stacks,sys_nosys); 128 __strong_alias(sys_sa_enable,sys_nosys); 129 __strong_alias(sys_sa_setconcurrency,sys_nosys); 130 __strong_alias(sys_sa_yield,sys_nosys); 131 __strong_alias(sys_sa_preempt,sys_nosys); 132 __strong_alias(sys_sa_unblockyield,sys_nosys); 133 #endif 134 135 /* 136 * Stubs for architectures that do not support kernel preemption. 137 */ 138 #ifndef __HAVE_PREEMPTION 139 bool 140 cpu_kpreempt_enter(uintptr_t where, int s) 141 { 142 143 return false; 144 } 145 146 void 147 cpu_kpreempt_exit(uintptr_t where) 148 { 149 150 } 151 152 bool 153 cpu_kpreempt_disabled(void) 154 { 155 156 return true; 157 } 158 #else 159 # ifndef MULTIPROCESSOR 160 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 161 # endif 162 #endif /* !__HAVE_PREEMPTION */ 163 164 /* ARGSUSED */ 165 int 166 sys_nosys(struct lwp *l, const void *v, register_t *retval) 167 { 168 169 mutex_enter(proc_lock); 170 psignal(l->l_proc, SIGSYS); 171 mutex_exit(proc_lock); 172 return ENOSYS; 173 } 174 175 /* 176 * Unsupported device function (e.g. writing to read-only device). 177 */ 178 int 179 enodev(void) 180 { 181 182 return (ENODEV); 183 } 184 185 /* 186 * Unconfigured device function; driver not configured. 187 */ 188 int 189 enxio(void) 190 { 191 192 return (ENXIO); 193 } 194 195 /* 196 * Unsupported ioctl function. 197 */ 198 int 199 enoioctl(void) 200 { 201 202 return (ENOTTY); 203 } 204 205 /* 206 * Unsupported system function. 207 * This is used for an otherwise-reasonable operation 208 * that is not supported by the current system binary. 209 */ 210 int 211 enosys(void) 212 { 213 214 return (ENOSYS); 215 } 216 217 /* 218 * Return error for operation not supported 219 * on a specific object or file type. 220 */ 221 int 222 eopnotsupp(void) 223 { 224 225 return (EOPNOTSUPP); 226 } 227 228 /* 229 * Generic null operation, always returns success. 230 */ 231 /*ARGSUSED*/ 232 int 233 nullop(void *v) 234 { 235 236 return (0); 237 } 238
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