1 /* $NetBSD: kern_stub.c,v 1.22 2010/03/03 00:49:39 pooka 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 1.22 2010/03/03 00:49:39 pooka Exp $"); 66 67 #include "opt_ptrace.h" 68 #include "opt_ktrace.h" 69 #include "opt_modular.h" 70 #include "opt_sa.h" 71 72 /* XXX To get syscall prototypes. */ 73 #define SYSVSHM 74 #define SYSVSEM 75 #define SYSVMSG 76 77 #include <sys/param.h> 78 #include <sys/kernel.h> 79 #include <sys/proc.h> 80 #include <sys/fstypes.h> 81 #include <sys/signalvar.h> 82 #include <sys/syscall.h> 83 #include <sys/syscallargs.h> 84 #include <sys/syscallvar.h> 85 #include <sys/ktrace.h> 86 #include <sys/intr.h> 87 #include <sys/cpu.h> 88 #include <sys/module.h> 89 90 /* 91 * Nonexistent system call-- signal process (may want to handle it). Flag 92 * error in case process won't see signal immediately (blocked or ignored). 93 */ 94 #ifndef PTRACE 95 __weak_alias(sys_ptrace,sys_nosys); 96 #endif /* PTRACE */ 97 98 /* 99 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 100 * but not kill the process: utrace() is a debugging feature. 101 */ 102 #ifndef KTRACE 103 __weak_alias(ktr_csw,nullop); /* Probes */ 104 __weak_alias(ktr_emul,nullop); 105 __weak_alias(ktr_geniov,nullop); 106 __weak_alias(ktr_genio,nullop); 107 __weak_alias(ktr_mibio,nullop); 108 __weak_alias(ktr_namei,nullop); 109 __weak_alias(ktr_namei2,nullop); 110 __weak_alias(ktr_psig,nullop); 111 __weak_alias(ktr_saupcall,nullop); 112 __weak_alias(ktr_syscall,nullop); 113 __weak_alias(ktr_sysret,nullop); 114 __weak_alias(ktr_kuser,nullop); 115 __weak_alias(ktr_mmsg,nullop); 116 __weak_alias(ktr_mib,nullop); 117 __weak_alias(ktr_mool,nullop); 118 __weak_alias(ktr_execarg,nullop); 119 __weak_alias(ktr_execenv,nullop); 120 121 __weak_alias(sys_fktrace,sys_nosys); /* Syscalls */ 122 __weak_alias(sys_ktrace,sys_nosys); 123 __weak_alias(sys_utrace,sys_nosys); 124 125 int ktrace_on; /* Misc */ 126 __weak_alias(ktruser,enosys); 127 __weak_alias(ktr_point,nullop); 128 #endif /* KTRACE */ 129 130 __weak_alias(spldebug_start, voidop); 131 __weak_alias(spldebug_stop, voidop); 132 __weak_alias(machdep_init,nullop); 133 134 #if !defined(KERN_SA) 135 /* 136 * Scheduler activations system calls. These need to remain, even when 137 * KERN_SA isn't defined, until libc's major version is bumped. 138 */ 139 __strong_alias(sys_sa_register,sys_nosys); 140 __strong_alias(sys_sa_stacks,sys_nosys); 141 __strong_alias(sys_sa_enable,sys_nosys); 142 __strong_alias(sys_sa_setconcurrency,sys_nosys); 143 __strong_alias(sys_sa_yield,sys_nosys); 144 __strong_alias(sys_sa_preempt,sys_nosys); 145 __strong_alias(sys_sa_unblockyield,sys_nosys); 146 147 /* 148 * Stubs for compat_netbsd32. 149 */ 150 __strong_alias(dosa_register,sys_nosys); 151 __strong_alias(sa_stacks1,sys_nosys); 152 #endif 153 154 /* 155 * Stubs for architectures that do not support kernel preemption. 156 */ 157 #ifndef __HAVE_PREEMPTION 158 bool 159 cpu_kpreempt_enter(uintptr_t where, int s) 160 { 161 162 return false; 163 } 164 165 void 166 cpu_kpreempt_exit(uintptr_t where) 167 { 168 169 } 170 171 bool 172 cpu_kpreempt_disabled(void) 173 { 174 175 return true; 176 } 177 #else 178 # ifndef MULTIPROCESSOR 179 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 180 # endif 181 #endif /* !__HAVE_PREEMPTION */ 182 183 int 184 sys_nosys(struct lwp *l, const void *v, register_t *retval) 185 { 186 187 mutex_enter(proc_lock); 188 psignal(l->l_proc, SIGSYS); 189 mutex_exit(proc_lock); 190 return ENOSYS; 191 } 192 193 int 194 sys_nomodule(struct lwp *l, const void *v, register_t *retval) 195 { 196 #ifdef MODULAR 197 static struct { 198 u_int al_code; 199 const char *al_module; 200 } const autoload[] = { 201 { SYS_aio_cancel, "aio" }, 202 { SYS_aio_error, "aio" }, 203 { SYS_aio_fsync, "aio" }, 204 { SYS_aio_read, "aio" }, 205 { SYS_aio_return, "aio" }, 206 { SYS___aio_suspend50, "aio" }, 207 { SYS_aio_write, "aio" }, 208 { SYS_lio_listio, "aio" }, 209 { SYS_mq_open, "mqueue" }, 210 { SYS_mq_close, "mqueue" }, 211 { SYS_mq_unlink, "mqueue" }, 212 { SYS_mq_getattr, "mqueue" }, 213 { SYS_mq_setattr, "mqueue" }, 214 { SYS_mq_notify, "mqueue" }, 215 { SYS_mq_send, "mqueue" }, 216 { SYS_mq_receive, "mqueue" }, 217 { SYS___mq_timedsend50, "mqueue" }, 218 { SYS___mq_timedreceive50, "mqueue" }, 219 { SYS_compat_43_fstat43, "compat" }, 220 { SYS_compat_43_lstat43, "compat" }, 221 { SYS_compat_43_oaccept, "compat" }, 222 { SYS_compat_43_ocreat, "compat" }, 223 { SYS_compat_43_oftruncate, "compat" }, 224 { SYS_compat_43_ogetdirentries, "compat" }, 225 { SYS_compat_43_ogetdtablesize, "compat" }, 226 { SYS_compat_43_ogethostid, "compat" }, 227 { SYS_compat_43_ogethostname, "compat" }, 228 { SYS_compat_43_ogetkerninfo, "compat" }, 229 { SYS_compat_43_ogetpagesize, "compat" }, 230 { SYS_compat_43_ogetpeername, "compat" }, 231 { SYS_compat_43_ogetrlimit, "compat" }, 232 { SYS_compat_43_ogetsockname, "compat" }, 233 { SYS_compat_43_okillpg, "compat" }, 234 { SYS_compat_43_olseek, "compat" }, 235 { SYS_compat_43_ommap, "compat" }, 236 { SYS_compat_43_oquota, "compat" }, 237 { SYS_compat_43_orecv, "compat" }, 238 { SYS_compat_43_orecvfrom, "compat" }, 239 { SYS_compat_43_orecvmsg, "compat" }, 240 { SYS_compat_43_osend, "compat" }, 241 { SYS_compat_43_osendmsg, "compat" }, 242 { SYS_compat_43_osethostid, "compat" }, 243 { SYS_compat_43_osethostname, "compat" }, 244 { SYS_compat_43_osetrlimit, "compat" }, 245 { SYS_compat_43_osigblock, "compat" }, 246 { SYS_compat_43_osigsetmask, "compat" }, 247 { SYS_compat_43_osigstack, "compat" }, 248 { SYS_compat_43_osigvec, "compat" }, 249 { SYS_compat_43_otruncate, "compat" }, 250 { SYS_compat_43_owait, "compat" }, 251 { SYS_compat_43_stat43, "compat" }, 252 { SYS_compat_09_ogetdomainname, "compat" }, 253 { SYS_compat_09_osetdomainname, "compat" }, 254 { SYS_compat_09_ouname, "compat" }, 255 #ifndef _LP64 256 { SYS_compat_10_omsgsys, "compat" }, 257 { SYS_compat_10_osemsys, "compat" }, 258 { SYS_compat_10_oshmsys, "compat" }, 259 #endif 260 { SYS_compat_12_fstat12, "compat" }, 261 { SYS_compat_12_getdirentries, "compat" }, 262 { SYS_compat_12_lstat12, "compat" }, 263 { SYS_compat_12_msync, "compat" }, 264 { SYS_compat_12_oreboot, "compat" }, 265 { SYS_compat_12_oswapon, "compat" }, 266 { SYS_compat_12_stat12, "compat" }, 267 { SYS_compat_13_sigaction13, "compat" }, 268 { SYS_compat_13_sigaltstack13, "compat" }, 269 { SYS_compat_13_sigpending13, "compat" }, 270 { SYS_compat_13_sigprocmask13, "compat" }, 271 { SYS_compat_13_sigreturn13, "compat" }, 272 { SYS_compat_13_sigsuspend13, "compat" }, 273 { SYS_compat_14___semctl, "compat" }, 274 { SYS_compat_14_msgctl, "compat" }, 275 { SYS_compat_14_shmctl, "compat" }, 276 { SYS_compat_16___sigaction14, "compat" }, 277 { SYS_compat_16___sigreturn14, "compat" }, 278 { SYS_compat_20_fhstatfs, "compat" }, 279 { SYS_compat_20_fstatfs, "compat" }, 280 { SYS_compat_20_getfsstat, "compat" }, 281 { SYS_compat_20_statfs, "compat" }, 282 { SYS_compat_30___fhstat30, "compat" }, 283 { SYS_compat_30___fstat13, "compat" }, 284 { SYS_compat_30___lstat13, "compat" }, 285 { SYS_compat_30___stat13, "compat" }, 286 { SYS_compat_30_fhopen, "compat" }, 287 { SYS_compat_30_fhstat, "compat" }, 288 { SYS_compat_30_fhstatvfs1, "compat" }, 289 { SYS_compat_30_getdents, "compat" }, 290 { SYS_compat_30_getfh, "compat" }, 291 { SYS_compat_30_socket, "compat" }, 292 { SYS_compat_40_mount, "compat" }, 293 { SYS_compat_50_wait4, "compat" }, 294 { SYS_compat_50_mknod, "compat" }, 295 { SYS_compat_50_setitimer, "compat" }, 296 { SYS_compat_50_getitimer, "compat" }, 297 { SYS_compat_50_select, "compat" }, 298 { SYS_compat_50_gettimeofday, "compat" }, 299 { SYS_compat_50_getrusage, "compat" }, 300 { SYS_compat_50_settimeofday, "compat" }, 301 { SYS_compat_50_utimes, "compat" }, 302 { SYS_compat_50_adjtime, "compat" }, 303 { SYS_compat_50_lfs_segwait, "compat" }, 304 { SYS_compat_50_futimes, "compat" }, 305 { SYS_compat_50_clock_gettime, "compat" }, 306 { SYS_compat_50_clock_settime, "compat" }, 307 { SYS_compat_50_clock_getres, "compat" }, 308 { SYS_compat_50_timer_settime, "compat" }, 309 { SYS_compat_50_timer_gettime, "compat" }, 310 { SYS_compat_50_nanosleep, "compat" }, 311 { SYS_compat_50___sigtimedwait, "compat" }, 312 { SYS_compat_50_mq_timedsend, "compat" }, 313 { SYS_compat_50_mq_timedreceive, "compat" }, 314 { SYS_compat_50_lutimes, "compat" }, 315 { SYS_compat_50_____semctl13, "compat" }, 316 { SYS_compat_50___msgctl13, "compat" }, 317 { SYS_compat_50___shmctl13, "compat" }, 318 { SYS_compat_50__lwp_park, "compat" }, 319 { SYS_compat_50_kevent, "compat" }, 320 { SYS_compat_50_pselect, "compat" }, 321 { SYS_compat_50_pollts, "compat" }, 322 { SYS_compat_50___stat30, "compat" }, 323 { SYS_compat_50___fstat30, "compat" }, 324 { SYS_compat_50___lstat30, "compat" }, 325 { SYS_compat_50___ntp_gettime30, "compat" }, 326 { SYS_compat_50___fhstat40, "compat" }, 327 { SYS_compat_50_aio_suspend, "compat" }, 328 { SYS__ksem_init, "ksem" }, 329 { SYS__ksem_open, "ksem" }, 330 { SYS__ksem_unlink, "ksem" }, 331 { SYS__ksem_close, "ksem" }, 332 { SYS__ksem_post, "ksem" }, 333 { SYS__ksem_wait, "ksem" }, 334 { SYS__ksem_trywait, "ksem" }, 335 { SYS__ksem_getvalue, "ksem" }, 336 { SYS__ksem_destroy, "ksem" }, 337 { SYS_nfssvc, "nfsserver" }, 338 }; 339 const struct sysent *sy; 340 const struct emul *em; 341 int code, i; 342 343 /* 344 * Restart the syscall if we interrupted a module unload that 345 * failed. Acquiring module_lock delays us until any unload 346 * has been completed or rolled back. 347 */ 348 mutex_enter(&module_lock); 349 sy = l->l_sysent; 350 if (sy->sy_call != sys_nomodule) { 351 mutex_exit(&module_lock); 352 return ERESTART; 353 } 354 /* 355 * Try to autoload a module to satisfy the request. If it 356 * works, retry the request. 357 */ 358 em = l->l_proc->p_emul; 359 if (em == &emul_netbsd) { 360 code = sy - em->e_sysent; 361 for (i = 0; i < __arraycount(autoload); i++) { 362 if (autoload[i].al_code != code) { 363 continue; 364 } 365 if (module_autoload(autoload[i].al_module, 366 MODULE_CLASS_ANY) != 0 || 367 sy->sy_call == sys_nomodule) { 368 break; 369 } 370 mutex_exit(&module_lock); 371 return ERESTART; 372 } 373 } 374 mutex_exit(&module_lock); 375 #endif /* MODULAR */ 376 377 return sys_nosys(l, v, retval); 378 } 379 380 /* 381 * Unsupported device function (e.g. writing to read-only device). 382 */ 383 int 384 enodev(void) 385 { 386 387 return (ENODEV); 388 } 389 390 /* 391 * Unconfigured device function; driver not configured. 392 */ 393 int 394 enxio(void) 395 { 396 397 return (ENXIO); 398 } 399 400 /* 401 * Unsupported ioctl function. 402 */ 403 int 404 enoioctl(void) 405 { 406 407 return (ENOTTY); 408 } 409 410 /* 411 * Unsupported system function. 412 * This is used for an otherwise-reasonable operation 413 * that is not supported by the current system binary. 414 */ 415 int 416 enosys(void) 417 { 418 419 return (ENOSYS); 420 } 421 422 /* 423 * Return error for operation not supported 424 * on a specific object or file type. 425 */ 426 int 427 eopnotsupp(void) 428 { 429 430 return (EOPNOTSUPP); 431 } 432 433 /* 434 * Generic null operation, void return value. 435 */ 436 void 437 voidop(void) 438 { 439 } 440 441 /* 442 * Generic null operation, always returns success. 443 */ 444 /*ARGSUSED*/ 445 int 446 nullop(void *v) 447 { 448 449 return (0); 450 } 451