kern_stub.c revision 1.41
1 /* $NetBSD: kern_stub.c,v 1.41 2015/08/24 22:50:32 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 1.41 2015/08/24 22:50:32 pooka Exp $"); 66 67 #ifdef _KERNEL_OPT 68 #include "opt_ptrace.h" 69 #include "opt_ktrace.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 * Nonexistent system call-- signal process (may want to handle it). Flag 91 * error in case process won't see signal immediately (blocked or ignored). 92 */ 93 #ifndef PTRACE 94 __strong_alias(sys_ptrace,sys_nosys); 95 #endif /* PTRACE */ 96 97 /* 98 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 99 * but not kill the process: utrace() is a debugging feature. 100 */ 101 #ifndef KTRACE 102 __strong_alias(ktr_csw,nullop); /* Probes */ 103 __strong_alias(ktr_emul,nullop); 104 __strong_alias(ktr_geniov,nullop); 105 __strong_alias(ktr_genio,nullop); 106 __strong_alias(ktr_mibio,nullop); 107 __strong_alias(ktr_namei,nullop); 108 __strong_alias(ktr_namei2,nullop); 109 __strong_alias(ktr_psig,nullop); 110 __strong_alias(ktr_syscall,nullop); 111 __strong_alias(ktr_sysret,nullop); 112 __strong_alias(ktr_kuser,nullop); 113 __strong_alias(ktr_mib,nullop); 114 __strong_alias(ktr_execarg,nullop); 115 __strong_alias(ktr_execenv,nullop); 116 __strong_alias(ktr_execfd,nullop); 117 118 __strong_alias(sys_fktrace,sys_nosys); /* Syscalls */ 119 __strong_alias(sys_ktrace,sys_nosys); 120 __strong_alias(sys_utrace,sys_nosys); 121 122 int ktrace_on; /* Misc */ 123 __strong_alias(ktruser,enosys); 124 __strong_alias(ktr_point,nullop); 125 #endif /* KTRACE */ 126 127 __weak_alias(device_register, voidop); 128 __weak_alias(device_register_post_config, voidop); 129 __weak_alias(spldebug_start, voidop); 130 __weak_alias(spldebug_stop, voidop); 131 __weak_alias(machdep_init,nullop); 132 __weak_alias(pci_chipset_tag_create, eopnotsupp); 133 __weak_alias(pci_chipset_tag_destroy, voidop); 134 __weak_alias(bus_space_reserve, eopnotsupp); 135 __weak_alias(bus_space_reserve_subregion, eopnotsupp); 136 __weak_alias(bus_space_release, voidop); 137 __weak_alias(bus_space_reservation_map, eopnotsupp); 138 __weak_alias(bus_space_reservation_unmap, voidop); 139 __weak_alias(bus_dma_tag_create, eopnotsupp); 140 __weak_alias(bus_dma_tag_destroy, voidop); 141 __weak_alias(bus_space_tag_create, eopnotsupp); 142 __weak_alias(bus_space_tag_destroy, voidop); 143 __strict_weak_alias(bus_space_is_equal, default_bus_space_is_equal); 144 __strict_weak_alias(bus_space_handle_is_equal, 145 default_bus_space_handle_is_equal); 146 __weak_alias(userconf_bootinfo, voidop); 147 __weak_alias(userconf_init, voidop); 148 __weak_alias(userconf_prompt, voidop); 149 150 __weak_alias(kobj_renamespace, nullop); 151 152 __weak_alias(interrupt_get_count, eopnotsupp); 153 __weak_alias(interrupt_get_assigned, eopnotsupp); 154 __weak_alias(interrupt_get_available, eopnotsupp); 155 __weak_alias(interrupt_get_devname, eopnotsupp); 156 __weak_alias(interrupt_construct_intrids, eopnotsupp); 157 __weak_alias(interrupt_destruct_intrids, eopnotsupp); 158 __weak_alias(interrupt_distribute, eopnotsupp); 159 __weak_alias(interrupt_distribute_handler, eopnotsupp); 160 161 /* 162 * Scheduler activations system calls. These need to remain until libc's 163 * major version is bumped. 164 */ 165 __strong_alias(sys_sa_register,sys_nosys); 166 __strong_alias(sys_sa_stacks,sys_nosys); 167 __strong_alias(sys_sa_enable,sys_nosys); 168 __strong_alias(sys_sa_setconcurrency,sys_nosys); 169 __strong_alias(sys_sa_yield,sys_nosys); 170 __strong_alias(sys_sa_preempt,sys_nosys); 171 __strong_alias(sys_sa_unblockyield,sys_nosys); 172 173 /* 174 * Stubs for compat_netbsd32. 175 */ 176 __strong_alias(dosa_register,sys_nosys); 177 __strong_alias(sa_stacks1,sys_nosys); 178 179 /* 180 * Stubs for architectures that do not support kernel preemption. 181 */ 182 #ifndef __HAVE_PREEMPTION 183 bool 184 cpu_kpreempt_enter(uintptr_t where, int s) 185 { 186 187 return false; 188 } 189 190 void 191 cpu_kpreempt_exit(uintptr_t where) 192 { 193 194 } 195 196 bool 197 cpu_kpreempt_disabled(void) 198 { 199 200 return true; 201 } 202 #else 203 # ifndef MULTIPROCESSOR 204 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 205 # endif 206 #endif /* !__HAVE_PREEMPTION */ 207 208 int 209 sys_nosys(struct lwp *l, const void *v, register_t *retval) 210 { 211 212 mutex_enter(proc_lock); 213 psignal(l->l_proc, SIGSYS); 214 mutex_exit(proc_lock); 215 return ENOSYS; 216 } 217 218 /* 219 * Unsupported device function (e.g. writing to read-only device). 220 */ 221 int 222 enodev(void) 223 { 224 225 return (ENODEV); 226 } 227 228 /* 229 * Unconfigured device function; driver not configured. 230 */ 231 int 232 enxio(void) 233 { 234 235 return (ENXIO); 236 } 237 238 /* 239 * Unsupported ioctl function. 240 */ 241 int 242 enoioctl(void) 243 { 244 245 return (ENOTTY); 246 } 247 248 /* 249 * Unsupported system function. 250 * This is used for an otherwise-reasonable operation 251 * that is not supported by the current system binary. 252 */ 253 int 254 enosys(void) 255 { 256 257 return (ENOSYS); 258 } 259 260 /* 261 * Return error for operation not supported 262 * on a specific object or file type. 263 */ 264 int 265 eopnotsupp(void) 266 { 267 268 return (EOPNOTSUPP); 269 } 270 271 /* 272 * Generic null operation, void return value. 273 */ 274 void 275 voidop(void) 276 { 277 } 278 279 /* 280 * Generic null operation, always returns success. 281 */ 282 int 283 nullop(void *v) 284 { 285 286 return (0); 287 } 288 289 bool 290 default_bus_space_handle_is_equal(bus_space_tag_t t, 291 bus_space_handle_t h1, bus_space_handle_t h2) 292 { 293 294 return memcmp(&h1, &h2, sizeof(h1)) == 0; 295 } 296 297 bool 298 default_bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2) 299 { 300 301 return memcmp(&t1, &t2, sizeof(t1)) == 0; 302 } 303
Indexes created Mon Sep 22 21:09:42 GMT 2025