kern_stub.c revision 1.39
1 /* $NetBSD: kern_stub.c,v 1.39 2015/04/27 06:42:53 knakahara 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 1.39 2015/04/27 06:42:53 knakahara Exp $"); 66 67 #include "opt_ptrace.h" 68 #include "opt_ktrace.h" 69 70 #include <sys/param.h> 71 #include <sys/kernel.h> 72 #include <sys/proc.h> 73 #include <sys/fstypes.h> 74 #include <sys/signalvar.h> 75 #include <sys/syscall.h> 76 #include <sys/ktrace.h> 77 #include <sys/intr.h> 78 #include <sys/cpu.h> 79 #include <sys/module.h> 80 #include <sys/bus.h> 81 #include <sys/userconf.h> 82 83 bool default_bus_space_is_equal(bus_space_tag_t, bus_space_tag_t); 84 bool default_bus_space_handle_is_equal(bus_space_tag_t, bus_space_handle_t, 85 bus_space_handle_t); 86 87 /* 88 * Nonexistent system call-- signal process (may want to handle it). Flag 89 * error in case process won't see signal immediately (blocked or ignored). 90 */ 91 #ifndef PTRACE 92 __strong_alias(sys_ptrace,sys_nosys); 93 #endif /* PTRACE */ 94 95 /* 96 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 97 * but not kill the process: utrace() is a debugging feature. 98 */ 99 #ifndef KTRACE 100 __strong_alias(ktr_csw,nullop); /* Probes */ 101 __strong_alias(ktr_emul,nullop); 102 __strong_alias(ktr_geniov,nullop); 103 __strong_alias(ktr_genio,nullop); 104 __strong_alias(ktr_mibio,nullop); 105 __strong_alias(ktr_namei,nullop); 106 __strong_alias(ktr_namei2,nullop); 107 __strong_alias(ktr_psig,nullop); 108 __strong_alias(ktr_syscall,nullop); 109 __strong_alias(ktr_sysret,nullop); 110 __strong_alias(ktr_kuser,nullop); 111 __strong_alias(ktr_mib,nullop); 112 __strong_alias(ktr_execarg,nullop); 113 __strong_alias(ktr_execenv,nullop); 114 __strong_alias(ktr_execfd,nullop); 115 116 __strong_alias(sys_fktrace,sys_nosys); /* Syscalls */ 117 __strong_alias(sys_ktrace,sys_nosys); 118 __strong_alias(sys_utrace,sys_nosys); 119 120 int ktrace_on; /* Misc */ 121 __strong_alias(ktruser,enosys); 122 __strong_alias(ktr_point,nullop); 123 #endif /* KTRACE */ 124 125 __weak_alias(device_register, voidop); 126 __weak_alias(device_register_post_config, voidop); 127 __weak_alias(spldebug_start, voidop); 128 __weak_alias(spldebug_stop, voidop); 129 __weak_alias(machdep_init,nullop); 130 __weak_alias(pci_chipset_tag_create, eopnotsupp); 131 __weak_alias(pci_chipset_tag_destroy, voidop); 132 __weak_alias(bus_space_reserve, eopnotsupp); 133 __weak_alias(bus_space_reserve_subregion, eopnotsupp); 134 __weak_alias(bus_space_release, voidop); 135 __weak_alias(bus_space_reservation_map, eopnotsupp); 136 __weak_alias(bus_space_reservation_unmap, voidop); 137 __weak_alias(bus_dma_tag_create, eopnotsupp); 138 __weak_alias(bus_dma_tag_destroy, voidop); 139 __weak_alias(bus_space_tag_create, eopnotsupp); 140 __weak_alias(bus_space_tag_destroy, voidop); 141 __strict_weak_alias(bus_space_is_equal, default_bus_space_is_equal); 142 __strict_weak_alias(bus_space_handle_is_equal, 143 default_bus_space_handle_is_equal); 144 __weak_alias(userconf_bootinfo, voidop); 145 __weak_alias(userconf_init, voidop); 146 __weak_alias(userconf_prompt, voidop); 147 148 __weak_alias(kobj_renamespace, nullop); 149 150 __weak_alias(pci_intr_distribute, 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 bool 281 default_bus_space_handle_is_equal(bus_space_tag_t t, 282 bus_space_handle_t h1, bus_space_handle_t h2) 283 { 284 285 return memcmp(&h1, &h2, sizeof(h1)) == 0; 286 } 287 288 bool 289 default_bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2) 290 { 291 292 return memcmp(&t1, &t2, sizeof(t1)) == 0; 293 } 294
Indexes created Tue Sep 23 21:09:50 GMT 2025