1 /* $NetBSD: kern_stub.c,v 1.36 2011/08/31 20:09:57 dyoung 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 1.36 2011/08/31 20:09:57 dyoung Exp $"); 66 67 #include "opt_ptrace.h" 68 #include "opt_ktrace.h" 69 #include "opt_sa.h" 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 * Nonexistent system call-- signal process (may want to handle it). Flag 90 * error in case process won't see signal immediately (blocked or ignored). 91 */ 92 #ifndef PTRACE 93 __weak_alias(sys_ptrace,sys_nosys); 94 #endif /* PTRACE */ 95 96 /* 97 * ktrace stubs. ktruser() goes to enosys as we want to fail the syscall, 98 * but not kill the process: utrace() is a debugging feature. 99 */ 100 #ifndef KTRACE 101 __weak_alias(ktr_csw,nullop); /* Probes */ 102 __weak_alias(ktr_emul,nullop); 103 __weak_alias(ktr_geniov,nullop); 104 __weak_alias(ktr_genio,nullop); 105 __weak_alias(ktr_mibio,nullop); 106 __weak_alias(ktr_namei,nullop); 107 __weak_alias(ktr_namei2,nullop); 108 __weak_alias(ktr_psig,nullop); 109 __weak_alias(ktr_saupcall,nullop); 110 __weak_alias(ktr_syscall,nullop); 111 __weak_alias(ktr_sysret,nullop); 112 __weak_alias(ktr_kuser,nullop); 113 __weak_alias(ktr_mib,nullop); 114 __weak_alias(ktr_execarg,nullop); 115 __weak_alias(ktr_execenv,nullop); 116 __weak_alias(ktr_execfd,nullop); 117 118 __weak_alias(sys_fktrace,sys_nosys); /* Syscalls */ 119 __weak_alias(sys_ktrace,sys_nosys); 120 __weak_alias(sys_utrace,sys_nosys); 121 122 int ktrace_on; /* Misc */ 123 __weak_alias(ktruser,enosys); 124 __weak_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 #if !defined(KERN_SA) 153 /* 154 * Scheduler activations system calls. These need to remain, even when 155 * KERN_SA isn't defined, until libc's major version is bumped. 156 */ 157 __strong_alias(sys_sa_register,sys_nosys); 158 __strong_alias(sys_sa_stacks,sys_nosys); 159 __strong_alias(sys_sa_enable,sys_nosys); 160 __strong_alias(sys_sa_setconcurrency,sys_nosys); 161 __strong_alias(sys_sa_yield,sys_nosys); 162 __strong_alias(sys_sa_preempt,sys_nosys); 163 __strong_alias(sys_sa_unblockyield,sys_nosys); 164 165 /* 166 * Stubs for compat_netbsd32. 167 */ 168 __strong_alias(dosa_register,sys_nosys); 169 __strong_alias(sa_stacks1,sys_nosys); 170 #endif 171 172 /* 173 * Stubs for architectures that do not support kernel preemption. 174 */ 175 #ifndef __HAVE_PREEMPTION 176 bool 177 cpu_kpreempt_enter(uintptr_t where, int s) 178 { 179 180 return false; 181 } 182 183 void 184 cpu_kpreempt_exit(uintptr_t where) 185 { 186 187 } 188 189 bool 190 cpu_kpreempt_disabled(void) 191 { 192 193 return true; 194 } 195 #else 196 # ifndef MULTIPROCESSOR 197 # error __HAVE_PREEMPTION requires MULTIPROCESSOR 198 # endif 199 #endif /* !__HAVE_PREEMPTION */ 200 201 int 202 sys_nosys(struct lwp *l, const void *v, register_t *retval) 203 { 204 205 mutex_enter(proc_lock); 206 psignal(l->l_proc, SIGSYS); 207 mutex_exit(proc_lock); 208 return ENOSYS; 209 } 210 211 /* 212 * Unsupported device function (e.g. writing to read-only device). 213 */ 214 int 215 enodev(void) 216 { 217 218 return (ENODEV); 219 } 220 221 /* 222 * Unconfigured device function; driver not configured. 223 */ 224 int 225 enxio(void) 226 { 227 228 return (ENXIO); 229 } 230 231 /* 232 * Unsupported ioctl function. 233 */ 234 int 235 enoioctl(void) 236 { 237 238 return (ENOTTY); 239 } 240 241 /* 242 * Unsupported system function. 243 * This is used for an otherwise-reasonable operation 244 * that is not supported by the current system binary. 245 */ 246 int 247 enosys(void) 248 { 249 250 return (ENOSYS); 251 } 252 253 /* 254 * Return error for operation not supported 255 * on a specific object or file type. 256 */ 257 int 258 eopnotsupp(void) 259 { 260 261 return (EOPNOTSUPP); 262 } 263 264 /* 265 * Generic null operation, void return value. 266 */ 267 void 268 voidop(void) 269 { 270 } 271 272 /* 273 * Generic null operation, always returns success. 274 */ 275 /*ARGSUSED*/ 276 int 277 nullop(void *v) 278 { 279 280 return (0); 281 } 282 283 bool 284 default_bus_space_handle_is_equal(bus_space_tag_t t, 285 bus_space_handle_t h1, bus_space_handle_t h2) 286 { 287 288 return memcmp(&h1, &h2, sizeof(h1)) == 0; 289 } 290 291 bool 292 default_bus_space_is_equal(bus_space_tag_t t1, bus_space_tag_t t2) 293 { 294 295 return memcmp(&t1, &t2, sizeof(t1)) == 0; 296 } 297