kern_stub.c revision 1.44
1 /* $NetBSD: kern_stub.c,v 1.44 2017/12/16 18:42:22 christos 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 1.44 2017/12/16 18:42:22 christos Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_ktrace.h" 69 #include "opt_sysv.h" 70 #endif 71 72 #include <sys/param.h> 73 #include <sys/kernel.h> 74 #include <sys/proc.h> 75 #include <sys/fstypes.h> 76 #include <sys/signalvar.h> 77 #include <sys/syscall.h> 78 #include <sys/ktrace.h> 79 #include <sys/intr.h> 80 #include <sys/cpu.h> 81 #include <sys/module.h> 82 #include <sys/bus.h> 83 #include <sys/userconf.h> 84 85 bool default_bus_space_is_equal(bus_space_tag_t, bus_space_tag_t); 86 bool default_bus_space_handle_is_equal(bus_space_tag_t, bus_space_handle_t, 87 bus_space_handle_t); 88 89 /* 90 * SYSV Semaphores, Shared Memory, Message Queues 91 */ 92 #ifndef SYSVMSG 93 __strong_alias(msgctl1,enosys); 94 #endif 95 #ifndef SYSVSHM 96 __strong_alias(shmctl1,enosys); 97 #endif 98 #ifndef SYSVSEM 99 __strong_alias(semctl1,enosys); 100 #endif 101 102 /* 103 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 104 * but not kill the process: utrace() is a debugging feature. 105 */ 106 #ifndef KTRACE 107 __strong_alias(ktr_csw,nullop); /* Probes */ 108 __strong_alias(ktr_emul,nullop); 109 __strong_alias(ktr_geniov,nullop); 110 __strong_alias(ktr_genio,nullop); 111 __strong_alias(ktr_mibio,nullop); 112 __strong_alias(ktr_namei,nullop); 113 __strong_alias(ktr_namei2,nullop); 114 __strong_alias(ktr_psig,nullop); 115 __strong_alias(ktr_syscall,nullop); 116 __strong_alias(ktr_sysret,nullop); 117 __strong_alias(ktr_kuser,nullop); 118 __strong_alias(ktr_mib,nullop); 119 __strong_alias(ktr_execarg,nullop); 120 __strong_alias(ktr_execenv,nullop); 121 __strong_alias(ktr_execfd,nullop); 122 123 __strong_alias(sys_fktrace,sys_nosys); /* Syscalls */ 124 __strong_alias(sys_ktrace,sys_nosys); 125 __strong_alias(sys_utrace,sys_nosys); 126 127 int ktrace_on; /* Misc */ 128 __strong_alias(ktruser,enosys); 129 __strong_alias(ktr_point,nullop); 130 #endif /* KTRACE */ 131 132 __weak_alias(device_register, voidop); 133 __weak_alias(device_register_post_config, voidop); 134 __weak_alias(spldebug_start, voidop); 135 __weak_alias(spldebug_stop, voidop); 136 __weak_alias(machdep_init,nullop); 137 __weak_alias(pci_chipset_tag_create, eopnotsupp); 138 __weak_alias(pci_chipset_tag_destroy, voidop); 139 __weak_alias(bus_space_reserve, eopnotsupp); 140 __weak_alias(bus_space_reserve_subregion, eopnotsupp); 141 __weak_alias(bus_space_release, voidop); 142 __weak_alias(bus_space_reservation_map, eopnotsupp); 143 __weak_alias(bus_space_reservation_unmap, voidop); 144 __weak_alias(bus_dma_tag_create, eopnotsupp); 145 __weak_alias(bus_dma_tag_destroy, voidop); 146 __weak_alias(bus_space_tag_create, eopnotsupp); 147 __weak_alias(bus_space_tag_destroy, voidop); 148 __strict_weak_alias(bus_space_is_equal, default_bus_space_is_equal); 149 __strict_weak_alias(bus_space_handle_is_equal, 150 default_bus_space_handle_is_equal); 151 __weak_alias(userconf_bootinfo, voidop); 152 __weak_alias(userconf_init, voidop); 153 __weak_alias(userconf_prompt, voidop); 154 155 __weak_alias(kobj_renamespace, nullop); 156 157 __weak_alias(interrupt_get_count, nullop); 158 __weak_alias(interrupt_get_assigned, voidop); 159 __weak_alias(interrupt_get_available, voidop); 160 __weak_alias(interrupt_get_devname, voidop); 161 __weak_alias(interrupt_construct_intrids, nullret); 162 __weak_alias(interrupt_destruct_intrids, voidop); 163 __weak_alias(interrupt_distribute, eopnotsupp); 164 __weak_alias(interrupt_distribute_handler, eopnotsupp); 165 166 /* 167 * Scheduler activations system calls. These need to remain until libc's 168 * major version is bumped. 169 */ 170 __strong_alias(sys_sa_register,sys_nosys); 171 __strong_alias(sys_sa_stacks,sys_nosys); 172 __strong_alias(sys_sa_enable,sys_nosys); 173 __strong_alias(sys_sa_setconcurrency,sys_nosys); 174 __strong_alias(sys_sa_yield,sys_nosys); 175 __strong_alias(sys_sa_preempt,sys_nosys); 176 __strong_alias(sys_sa_unblockyield,sys_nosys); 177 178 /* 179 * Stubs for compat_netbsd32. 180 */ 181 __strong_alias(dosa_register,sys_nosys); 182 __strong_alias(sa_stacks1,sys_nosys); 183 184 /* 185 * Stubs for architectures that do not support kernel preemption. 186 */ 187 #ifndef __HAVE_PREEMPTION 188 bool 189 cpu_kpreempt_enter(uintptr_t where, int s) 190 { 191 192 return false; 193 } 194 195 void 196 cpu_kpreempt_exit(uintptr_t where) 197 { 198 199 } 200 201 bool 202 cpu_kpreempt_disabled(void) 203 { 204 205 return true; 206 } 207 #else 208 # ifndef MULTIPROCESSOR 209 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 210 # endif 211 #endif /* !__HAVE_PREEMPTION */ 212 213 int 214 sys_nosys(struct lwp *l, const void *v, register_t *retval) 215 { 216 217 mutex_enter(proc_lock); 218 psignal(l->l_proc, SIGSYS); 219 mutex_exit(proc_lock); 220 return ENOSYS; 221 } 222 223 /* 224 * Unsupported device function (e.g. writing to read-only device). 225 */ 226 int 227 enodev(void) 228 { 229 230 return (ENODEV); 231 } 232 233 /* 234 * Unconfigured device function; driver not configured. 235 */ 236 int 237 enxio(void) 238 { 239 240 return (ENXIO); 241 } 242 243 /* 244 * Unsupported ioctl function. 245 */ 246 int 247 enoioctl(void) 248 { 249 250 return (ENOTTY); 251 } 252 253 /* 254 * Unsupported system function. 255 * This is used for an otherwise-reasonable operation 256 * that is not supported by the current system binary. 257 */ 258 int 259 enosys(void) 260 { 261 262 return (ENOSYS); 263 } 264 265 /* 266 * Return error for operation not supported 267 * on a specific object or file type. 268 */ 269 int 270 eopnotsupp(void) 271 { 272 273 return (EOPNOTSUPP); 274 } 275 276 /* 277 * Generic null operation, void return value. 278 */ 279 void 280 voidop(void) 281 { 282 } 283 284 /* 285 * Generic null operation, always returns success. 286 */ 287 int 288 nullop(void *v) 289 { 290 291 return (0); 292 } 293 294 /* 295 * Generic null operation, always returns null. 296 */ 297 void * 298 nullret(void) 299 { 300 301 return (NULL); 302 } 303 304 bool 305 default_bus_space_handle_is_equal(bus_space_tag_t t, 306 bus_space_handle_t h1, bus_space_handle_t h2) 307 { 308 309 return memcmp(&h1, &h2, sizeof(h1)) == 0; 310 } 311 312 bool 313 default_bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2) 314 { 315 316 return memcmp(&t1, &t2, sizeof(t1)) == 0; 317 } 318
Indexes created Wed Sep 24 15:09:51 GMT 2025