| 1 | /* $NetBSD: kern_stub.c,v 1.43 2016/11/02 00:11:59 pgoyette 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 1.43 2016/11/02 00:11:59 pgoyette Exp $" ); |
| 66 | |
| 67 | #ifdef _KERNEL_OPT |
| 68 | #include "opt_ktrace.h" |
| 69 | #endif |
| 70 | |
| 71 | #include <sys/param.h> |
| 72 | #include <sys/kernel.h> |
| 73 | #include <sys/proc.h> |
| 74 | #include <sys/fstypes.h> |
| 75 | #include <sys/signalvar.h> |
| 76 | #include <sys/syscall.h> |
| 77 | #include <sys/ktrace.h> |
| 78 | #include <sys/intr.h> |
| 79 | #include <sys/cpu.h> |
| 80 | #include <sys/module.h> |
| 81 | #include <sys/bus.h> |
| 82 | #include <sys/userconf.h> |
| 83 | |
| 84 | bool default_bus_space_is_equal(bus_space_tag_t, bus_space_tag_t); |
| 85 | bool default_bus_space_handle_is_equal(bus_space_tag_t, bus_space_handle_t, |
| 86 | bus_space_handle_t); |
| 87 | |
| 88 | /* |
| 89 | * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, |
| 90 | * but not kill the process: utrace() is a debugging feature. |
| 91 | */ |
| 92 | #ifndef KTRACE |
| 93 | __strong_alias(ktr_csw,nullop); /* Probes */ |
| 94 | __strong_alias(ktr_emul,nullop); |
| 95 | __strong_alias(ktr_geniov,nullop); |
| 96 | __strong_alias(ktr_genio,nullop); |
| 97 | __strong_alias(ktr_mibio,nullop); |
| 98 | __strong_alias(ktr_namei,nullop); |
| 99 | __strong_alias(ktr_namei2,nullop); |
| 100 | __strong_alias(ktr_psig,nullop); |
| 101 | __strong_alias(ktr_syscall,nullop); |
| 102 | __strong_alias(ktr_sysret,nullop); |
| 103 | __strong_alias(ktr_kuser,nullop); |
| 104 | __strong_alias(ktr_mib,nullop); |
| 105 | __strong_alias(ktr_execarg,nullop); |
| 106 | __strong_alias(ktr_execenv,nullop); |
| 107 | __strong_alias(ktr_execfd,nullop); |
| 108 | |
| 109 | __strong_alias(sys_fktrace,sys_nosys); /* Syscalls */ |
| 110 | __strong_alias(sys_ktrace,sys_nosys); |
| 111 | __strong_alias(sys_utrace,sys_nosys); |
| 112 | |
| 113 | int ktrace_on; /* Misc */ |
| 114 | __strong_alias(ktruser,enosys); |
| 115 | __strong_alias(ktr_point,nullop); |
| 116 | #endif /* KTRACE */ |
| 117 | |
| 118 | __weak_alias(device_register, voidop); |
| 119 | __weak_alias(device_register_post_config, voidop); |
| 120 | __weak_alias(spldebug_start, voidop); |
| 121 | __weak_alias(spldebug_stop, voidop); |
| 122 | __weak_alias(machdep_init,nullop); |
| 123 | __weak_alias(pci_chipset_tag_create, eopnotsupp); |
| 124 | __weak_alias(pci_chipset_tag_destroy, voidop); |
| 125 | __weak_alias(bus_space_reserve, eopnotsupp); |
| 126 | __weak_alias(bus_space_reserve_subregion, eopnotsupp); |
| 127 | __weak_alias(bus_space_release, voidop); |
| 128 | __weak_alias(bus_space_reservation_map, eopnotsupp); |
| 129 | __weak_alias(bus_space_reservation_unmap, voidop); |
| 130 | __weak_alias(bus_dma_tag_create, eopnotsupp); |
| 131 | __weak_alias(bus_dma_tag_destroy, voidop); |
| 132 | __weak_alias(bus_space_tag_create, eopnotsupp); |
| 133 | __weak_alias(bus_space_tag_destroy, voidop); |
| 134 | __strict_weak_alias(bus_space_is_equal, default_bus_space_is_equal); |
| 135 | __strict_weak_alias(bus_space_handle_is_equal, |
| 136 | default_bus_space_handle_is_equal); |
| 137 | __weak_alias(userconf_bootinfo, voidop); |
| 138 | __weak_alias(userconf_init, voidop); |
| 139 | __weak_alias(userconf_prompt, voidop); |
| 140 | |
| 141 | __weak_alias(kobj_renamespace, nullop); |
| 142 | |
| 143 | __weak_alias(interrupt_get_count, nullop); |
| 144 | __weak_alias(interrupt_get_assigned, voidop); |
| 145 | __weak_alias(interrupt_get_available, voidop); |
| 146 | __weak_alias(interrupt_get_devname, voidop); |
| 147 | __weak_alias(interrupt_construct_intrids, nullret); |
| 148 | __weak_alias(interrupt_destruct_intrids, voidop); |
| 149 | __weak_alias(interrupt_distribute, eopnotsupp); |
| 150 | __weak_alias(interrupt_distribute_handler, eopnotsupp); |
| 151 | |
| 152 | /* |
| 153 | * Scheduler activations system calls. These need to remain until libc's |
| 154 | * major version is bumped. |
| 155 | */ |
| 156 | __strong_alias(sys_sa_register,sys_nosys); |
| 157 | __strong_alias(sys_sa_stacks,sys_nosys); |
| 158 | __strong_alias(sys_sa_enable,sys_nosys); |
| 159 | __strong_alias(sys_sa_setconcurrency,sys_nosys); |
| 160 | __strong_alias(sys_sa_yield,sys_nosys); |
| 161 | __strong_alias(sys_sa_preempt,sys_nosys); |
| 162 | __strong_alias(sys_sa_unblockyield,sys_nosys); |
| 163 | |
| 164 | /* |
| 165 | * Stubs for compat_netbsd32. |
| 166 | */ |
| 167 | __strong_alias(dosa_register,sys_nosys); |
| 168 | __strong_alias(sa_stacks1,sys_nosys); |
| 169 | |
| 170 | /* |
| 171 | * Stubs for architectures that do not support kernel preemption. |
| 172 | */ |
| 173 | #ifndef __HAVE_PREEMPTION |
| 174 | bool |
| 175 | cpu_kpreempt_enter(uintptr_t where, int s) |
| 176 | { |
| 177 | |
| 178 | return false; |
| 179 | } |
| 180 | |
| 181 | void |
| 182 | cpu_kpreempt_exit(uintptr_t where) |
| 183 | { |
| 184 | |
| 185 | } |
| 186 | |
| 187 | bool |
| 188 | cpu_kpreempt_disabled(void) |
| 189 | { |
| 190 | |
| 191 | return true; |
| 192 | } |
| 193 | #else |
| 194 | # ifndef MULTIPROCESSOR |
| 195 | # error __HAVE_PREEMPTION requires MULTIPROCESSOR |
| 196 | # endif |
| 197 | #endif /* !__HAVE_PREEMPTION */ |
| 198 | |
| 199 | int |
| 200 | sys_nosys(struct lwp *l, const void *v, register_t *retval) |
| 201 | { |
| 202 | |
| 203 | mutex_enter(proc_lock); |
| 204 | psignal(l->l_proc, SIGSYS); |
| 205 | mutex_exit(proc_lock); |
| 206 | return ENOSYS; |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Unsupported device function (e.g. writing to read-only device). |
| 211 | */ |
| 212 | int |
| 213 | enodev(void) |
| 214 | { |
| 215 | |
| 216 | return (ENODEV); |
| 217 | } |
| 218 | |
| 219 | /* |
| 220 | * Unconfigured device function; driver not configured. |
| 221 | */ |
| 222 | int |
| 223 | enxio(void) |
| 224 | { |
| 225 | |
| 226 | return (ENXIO); |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * Unsupported ioctl function. |
| 231 | */ |
| 232 | int |
| 233 | enoioctl(void) |
| 234 | { |
| 235 | |
| 236 | return (ENOTTY); |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Unsupported system function. |
| 241 | * This is used for an otherwise-reasonable operation |
| 242 | * that is not supported by the current system binary. |
| 243 | */ |
| 244 | int |
| 245 | enosys(void) |
| 246 | { |
| 247 | |
| 248 | return (ENOSYS); |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * Return error for operation not supported |
| 253 | * on a specific object or file type. |
| 254 | */ |
| 255 | int |
| 256 | eopnotsupp(void) |
| 257 | { |
| 258 | |
| 259 | return (EOPNOTSUPP); |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Generic null operation, void return value. |
| 264 | */ |
| 265 | void |
| 266 | voidop(void) |
| 267 | { |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Generic null operation, always returns success. |
| 272 | */ |
| 273 | int |
| 274 | nullop(void *v) |
| 275 | { |
| 276 | |
| 277 | return (0); |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * Generic null operation, always returns null. |
| 282 | */ |
| 283 | void * |
| 284 | nullret(void) |
| 285 | { |
| 286 | |
| 287 | return (NULL); |
| 288 | } |
| 289 | |
| 290 | bool |
| 291 | default_bus_space_handle_is_equal(bus_space_tag_t t, |
| 292 | bus_space_handle_t h1, bus_space_handle_t h2) |
| 293 | { |
| 294 | |
| 295 | return memcmp(&h1, &h2, sizeof(h1)) == 0; |
| 296 | } |
| 297 | |
| 298 | bool |
| 299 | default_bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2) |
| 300 | { |
| 301 | |
| 302 | return memcmp(&t1, &t2, sizeof(t1)) == 0; |
| 303 | } |
| 304 | |