Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/kern_stub.c
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1 /* $NetBSD: kern_stub.c,v 1.50 2020/08/01 02:04:55 riastradh 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 1.50 2020/08/01 02:04:55 riastradh 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 #include <sys/kernel.h> 75 #include <sys/proc.h> 76 #include <sys/fstypes.h> 77 #include <sys/signalvar.h> 78 #include <sys/syscall.h> 79 #include <sys/ktrace.h> 80 #include <sys/intr.h> 81 #include <sys/cpu.h> 82 #include <sys/module.h> 83 #include <sys/bus.h> 84 #include <sys/userconf.h> 85 86 bool default_bus_space_is_equal(bus_space_tag_t, bus_space_tag_t); 87 bool default_bus_space_handle_is_equal(bus_space_tag_t, bus_space_handle_t, 88 bus_space_handle_t); 89 90 /* 91 * SYSV Semaphores, Shared Memory, Message Queues 92 */ 93 #ifndef MODULAR 94 #ifndef SYSVMSG 95 __strong_alias(msgctl1,enosys); 96 #endif 97 #ifndef SYSVSHM 98 __strong_alias(shmctl1,enosys); 99 #endif 100 #ifndef SYSVSEM 101 __strong_alias(semctl1,enosys); 102 #endif 103 #endif 104 105 /* 106 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 107 * but not kill the process: utrace() is a debugging feature. 108 */ 109 #ifndef KTRACE 110 __strong_alias(ktr_csw,nullop); /* Probes */ 111 __strong_alias(ktr_emul,nullop); 112 __strong_alias(ktr_geniov,nullop); 113 __strong_alias(ktr_genio,nullop); 114 __strong_alias(ktr_mibio,nullop); 115 __strong_alias(ktr_namei,nullop); 116 __strong_alias(ktr_namei2,nullop); 117 __strong_alias(ktr_psig,nullop); 118 __strong_alias(ktr_syscall,nullop); 119 __strong_alias(ktr_sysret,nullop); 120 __strong_alias(ktr_kuser,nullop); 121 __strong_alias(ktr_mib,nullop); 122 __strong_alias(ktr_execarg,nullop); 123 __strong_alias(ktr_execenv,nullop); 124 __strong_alias(ktr_execfd,nullop); 125 126 __strong_alias(sys_fktrace,sys_nosys); /* Syscalls */ 127 __strong_alias(sys_ktrace,sys_nosys); 128 __strong_alias(sys_utrace,sys_nosys); 129 130 int ktrace_on; /* Misc */ 131 __strong_alias(ktruser,enosys); 132 __strong_alias(ktr_point,nullop); 133 #endif /* KTRACE */ 134 135 __weak_alias(device_register, voidop); 136 __weak_alias(device_register_post_config, voidop); 137 __weak_alias(spldebug_start, voidop); 138 __weak_alias(spldebug_stop, voidop); 139 __weak_alias(machdep_init,nullop); 140 __weak_alias(pci_chipset_tag_create, eopnotsupp); 141 __weak_alias(pci_chipset_tag_destroy, voidop); 142 __weak_alias(bus_space_reserve, eopnotsupp); 143 __weak_alias(bus_space_reserve_subregion, eopnotsupp); 144 __weak_alias(bus_space_release, voidop); 145 __weak_alias(bus_space_reservation_map, eopnotsupp); 146 __weak_alias(bus_space_reservation_unmap, voidop); 147 __weak_alias(bus_dma_tag_create, eopnotsupp); 148 __weak_alias(bus_dma_tag_destroy, voidop); 149 __weak_alias(bus_space_tag_create, eopnotsupp); 150 __weak_alias(bus_space_tag_destroy, voidop); 151 __strict_weak_alias(bus_space_is_equal, default_bus_space_is_equal); 152 __strict_weak_alias(bus_space_handle_is_equal, 153 default_bus_space_handle_is_equal); 154 __weak_alias(userconf_bootinfo, voidop); 155 __weak_alias(userconf_init, voidop); 156 __weak_alias(userconf_prompt, voidop); 157 158 __weak_alias(kobj_renamespace, nullop); 159 160 __weak_alias(interrupt_get_count, nullop); 161 __weak_alias(interrupt_get_assigned, voidop); 162 __weak_alias(interrupt_get_available, voidop); 163 __weak_alias(interrupt_get_devname, voidop); 164 __weak_alias(interrupt_construct_intrids, nullret); 165 __weak_alias(interrupt_destruct_intrids, voidop); 166 __weak_alias(interrupt_distribute, eopnotsupp); 167 __weak_alias(interrupt_distribute_handler, eopnotsupp); 168 169 /* 170 * Scheduler activations system calls. These need to remain until libc's 171 * major version is bumped. 172 */ 173 __strong_alias(sys_sa_register,sys_nosys); 174 __strong_alias(sys_sa_stacks,sys_nosys); 175 __strong_alias(sys_sa_enable,sys_nosys); 176 __strong_alias(sys_sa_setconcurrency,sys_nosys); 177 __strong_alias(sys_sa_yield,sys_nosys); 178 __strong_alias(sys_sa_preempt,sys_nosys); 179 __strong_alias(sys_sa_unblockyield,sys_nosys); 180 181 /* 182 * Stubs for compat_netbsd32. 183 */ 184 __strong_alias(dosa_register,sys_nosys); 185 __strong_alias(sa_stacks1,sys_nosys); 186 187 /* 188 * Stubs for drivers. See sys/conf.h. 189 */ 190 __strong_alias(devenodev,enodev); 191 __strong_alias(deveopnotsupp,eopnotsupp); 192 __strong_alias(devnullop,nullop); 193 __strong_alias(ttyenodev,enodev); 194 __strong_alias(ttyvenodev,voidop); 195 __strong_alias(ttyvnullop,nullop); 196 197 /* 198 * Stubs for architectures that do not support kernel preemption. 199 */ 200 #ifndef __HAVE_PREEMPTION 201 bool 202 cpu_kpreempt_enter(uintptr_t where, int s) 203 { 204 205 return false; 206 } 207 208 void 209 cpu_kpreempt_exit(uintptr_t where) 210 { 211 212 } 213 214 bool 215 cpu_kpreempt_disabled(void) 216 { 217 218 return true; 219 } 220 #else 221 # ifndef MULTIPROCESSOR 222 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 223 # endif 224 #endif /* !__HAVE_PREEMPTION */ 225 226 int 227 sys_nosys(struct lwp *l, const void *v, register_t *retval) 228 { 229 230 mutex_enter(&proc_lock); 231 psignal(l->l_proc, SIGSYS); 232 mutex_exit(&proc_lock); 233 return ENOSYS; 234 } 235 236 /* 237 * Unsupported device function (e.g. writing to read-only device). 238 */ 239 int 240 enodev(void) 241 { 242 243 return (ENODEV); 244 } 245 246 /* 247 * Unconfigured device function; driver not configured. 248 */ 249 int 250 enxio(void) 251 { 252 253 return (ENXIO); 254 } 255 256 /* 257 * Unsupported ioctl function. 258 */ 259 int 260 enoioctl(void) 261 { 262 263 return (ENOTTY); 264 } 265 266 /* 267 * Unsupported system function. 268 * This is used for an otherwise-reasonable operation 269 * that is not supported by the current system binary. 270 */ 271 int 272 enosys(void) 273 { 274 275 return (ENOSYS); 276 } 277 278 /* 279 * Return error for operation not supported 280 * on a specific object or file type. 281 */ 282 int 283 eopnotsupp(void) 284 { 285 286 return (EOPNOTSUPP); 287 } 288 289 /* 290 * Generic null operation, void return value. 291 */ 292 void 293 voidop(void) 294 { 295 } 296 297 /* 298 * Generic null operation, always returns success. 299 */ 300 int 301 nullop(void *v) 302 { 303 304 return (0); 305 } 306 307 /* 308 * Generic null operation, always returns null. 309 */ 310 void * 311 nullret(void) 312 { 313 314 return (NULL); 315 } 316 317 bool 318 default_bus_space_handle_is_equal(bus_space_tag_t t, 319 bus_space_handle_t h1, bus_space_handle_t h2) 320 { 321 322 return memcmp(&h1, &h2, sizeof(h1)) == 0; 323 } 324 325 bool 326 default_bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2) 327 { 328 329 return memcmp(&t1, &t2, sizeof(t1)) == 0; 330 } 331 332 /* Stubs for architectures with no kernel FPU access. */ 333 __weak_alias(kthread_fpu_enter_md, voidop); 334 __weak_alias(kthread_fpu_exit_md, voidop);
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