1 /* $NetBSD: kern_stub.c,v 1.53 2026/02/01 19:41:46 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 1.53 2026/02/01 19:41:46 christos Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_ktrace.h" 69 #include "opt_sysv.h" 70 #include "opt_modular.h" 71 #endif 72 73 #include <sys/param.h> 74 75 #include <sys/bus.h> 76 #include <sys/cpu.h> 77 #include <sys/fstypes.h> 78 #include <sys/intr.h> 79 #include <sys/kernel.h> 80 #include <sys/ktrace.h> 81 #include <sys/module.h> 82 #include <sys/proc.h> 83 #include <sys/sdt.h> 84 #include <sys/signalvar.h> 85 #include <sys/syscall.h> 86 #include <sys/userconf.h> 87 88 bool default_bus_space_is_equal(bus_space_tag_t, bus_space_tag_t); 89 bool default_bus_space_handle_is_equal(bus_space_tag_t, bus_space_handle_t, 90 bus_space_handle_t); 91 92 /* 93 * SYSV Semaphores, Shared Memory, Message Queues 94 */ 95 #ifndef MODULAR 96 #ifndef SYSVMSG 97 __strong_alias(msgctl1,enosys); 98 #endif 99 #ifndef SYSVSHM 100 __strong_alias(shmctl1,enosys); 101 #endif 102 #ifndef SYSVSEM 103 __strong_alias(semctl1,enosys); 104 #endif 105 #endif 106 107 /* 108 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 109 * but not kill the process: utrace() is a debugging feature. 110 */ 111 #ifndef KTRACE 112 __strong_alias(ktr_csw,nullop); /* Probes */ 113 __strong_alias(ktr_emul,nullop); 114 __strong_alias(ktr_geniov,nullop); 115 __strong_alias(ktr_genio,nullop); 116 __strong_alias(ktr_mibio,nullop); 117 __strong_alias(ktr_namei,nullop); 118 __strong_alias(ktr_namei2,nullop); 119 __strong_alias(ktr_psig,nullop); 120 __strong_alias(ktr_syscall,nullop); 121 __strong_alias(ktr_sysret,nullop); 122 __strong_alias(ktr_kuser,nullop); 123 __strong_alias(ktr_mib,nullop); 124 __strong_alias(ktr_execarg,nullop); 125 __strong_alias(ktr_execenv,nullop); 126 __strong_alias(ktr_execfd,nullop); 127 __strong_alias(ktr_sigmask,nullop); 128 129 __strong_alias(sys_fktrace,sys_nosys); /* Syscalls */ 130 __strong_alias(sys_ktrace,sys_nosys); 131 __strong_alias(sys_utrace,sys_nosys); 132 133 int ktrace_on; /* Misc */ 134 __strong_alias(ktruser,enosys); 135 __strong_alias(ktr_point,nullop); 136 #endif /* KTRACE */ 137 138 __weak_alias(device_register, voidop); 139 __weak_alias(device_register_post_config, voidop); 140 __weak_alias(spldebug_start, voidop); 141 __weak_alias(spldebug_stop, voidop); 142 __weak_alias(machdep_init,nullop); 143 __weak_alias(pci_chipset_tag_create, eopnotsupp); 144 __weak_alias(pci_chipset_tag_destroy, voidop); 145 __weak_alias(bus_space_reserve, eopnotsupp); 146 __weak_alias(bus_space_reserve_subregion, eopnotsupp); 147 __weak_alias(bus_space_release, voidop); 148 __weak_alias(bus_space_reservation_map, eopnotsupp); 149 __weak_alias(bus_space_reservation_unmap, voidop); 150 __weak_alias(bus_dma_tag_create, eopnotsupp); 151 __weak_alias(bus_dma_tag_destroy, voidop); 152 __weak_alias(bus_space_tag_create, eopnotsupp); 153 __weak_alias(bus_space_tag_destroy, voidop); 154 __strict_weak_alias(bus_space_is_equal, default_bus_space_is_equal); 155 __strict_weak_alias(bus_space_handle_is_equal, 156 default_bus_space_handle_is_equal); 157 __weak_alias(userconf_bootinfo, voidop); 158 __weak_alias(userconf_init, voidop); 159 __weak_alias(userconf_prompt, voidop); 160 161 __weak_alias(kobj_renamespace, nullop); 162 163 __weak_alias(interrupt_get_count, nullop); 164 __weak_alias(interrupt_get_assigned, voidop); 165 __weak_alias(interrupt_get_available, voidop); 166 __weak_alias(interrupt_get_devname, voidop); 167 __weak_alias(interrupt_construct_intrids, nullret); 168 __weak_alias(interrupt_destruct_intrids, voidop); 169 __weak_alias(interrupt_distribute, eopnotsupp); 170 __weak_alias(interrupt_distribute_handler, eopnotsupp); 171 172 /* 173 * Scheduler activations system calls. These need to remain until libc's 174 * major version is bumped. 175 */ 176 __strong_alias(sys_sa_register,sys_nosys); 177 __strong_alias(sys_sa_stacks,sys_nosys); 178 __strong_alias(sys_sa_enable,sys_nosys); 179 __strong_alias(sys_sa_setconcurrency,sys_nosys); 180 __strong_alias(sys_sa_yield,sys_nosys); 181 __strong_alias(sys_sa_preempt,sys_nosys); 182 __strong_alias(sys_sa_unblockyield,sys_nosys); 183 184 /* 185 * Stubs for compat_netbsd32. 186 */ 187 __strong_alias(dosa_register,sys_nosys); 188 __strong_alias(sa_stacks1,sys_nosys); 189 190 /* 191 * Stubs for drivers. See sys/conf.h. 192 */ 193 __strong_alias(devenodev,enodev); 194 __strong_alias(deveopnotsupp,eopnotsupp); 195 __strong_alias(devnullop,nullop); 196 __strong_alias(ttyenodev,enodev); 197 __strong_alias(ttyvenodev,voidop); 198 __strong_alias(ttyvnullop,nullop); 199 200 /* 201 * Stubs for architectures that do not support kernel preemption. 202 */ 203 #ifndef __HAVE_PREEMPTION 204 bool 205 cpu_kpreempt_enter(uintptr_t where, int s) 206 { 207 208 return false; 209 } 210 211 void 212 cpu_kpreempt_exit(uintptr_t where) 213 { 214 215 } 216 217 bool 218 cpu_kpreempt_disabled(void) 219 { 220 221 return true; 222 } 223 #else 224 # ifndef MULTIPROCESSOR 225 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 226 # endif 227 #endif /* !__HAVE_PREEMPTION */ 228 229 int 230 sys_nosys(struct lwp *l, const void *v, register_t *retval) 231 { 232 233 mutex_enter(&proc_lock); 234 psignal(l->l_proc, SIGSYS); 235 mutex_exit(&proc_lock); 236 return SET_ERROR(ENOSYS); 237 } 238 239 /* 240 * Unsupported device function (e.g. writing to read-only device). 241 */ 242 int 243 enodev(void) 244 { 245 246 return SET_ERROR(ENODEV); 247 } 248 249 /* 250 * Unconfigured device function; driver not configured. 251 */ 252 int 253 enxio(void) 254 { 255 256 return SET_ERROR(ENXIO); 257 } 258 259 /* 260 * Unsupported ioctl function. 261 */ 262 int 263 enoioctl(void) 264 { 265 266 return SET_ERROR(ENOTTY); 267 } 268 269 /* 270 * Unsupported system function. 271 * This is used for an otherwise-reasonable operation 272 * that is not supported by the current system binary. 273 */ 274 int 275 enosys(void) 276 { 277 278 return SET_ERROR(ENOSYS); 279 } 280 281 /* 282 * Return error for operation not supported 283 * on a specific object or file type. 284 */ 285 int 286 eopnotsupp(void) 287 { 288 289 return SET_ERROR(EOPNOTSUPP); 290 } 291 292 /* 293 * Generic null operation, void return value. 294 */ 295 void 296 voidop(void) 297 { 298 } 299 300 /* 301 * Generic null operation, always returns success. 302 */ 303 int 304 nullop(void *v) 305 { 306 307 return (0); 308 } 309 310 /* 311 * Generic null operation, always returns null. 312 */ 313 void * 314 nullret(void) 315 { 316 317 return (NULL); 318 } 319 320 bool 321 default_bus_space_handle_is_equal(bus_space_tag_t t, 322 bus_space_handle_t h1, bus_space_handle_t h2) 323 { 324 325 return memcmp(&h1, &h2, sizeof(h1)) == 0; 326 } 327 328 bool 329 default_bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2) 330 { 331 332 return memcmp(&t1, &t2, sizeof(t1)) == 0; 333 } 334 335 /* Stubs for architectures with no kernel FPU access. */ 336 __weak_alias(kthread_fpu_enter_md, voidop); 337 __weak_alias(kthread_fpu_exit_md, voidop); 338
Indexes created Sat Feb 21 16:20:20 UTC 2026