1 /* $NetBSD: setemul.c,v 1.25 2007/12/31 15:26:31 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 2000 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the NetBSD 18 * Foundation, Inc. and its contributors. 19 * 4. Neither the name of The NetBSD Foundation nor the names of its 20 * contributors may be used to endorse or promote products derived 21 * from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 */ 35 36 /* 37 * Copyright (c) 1988, 1993 38 * The Regents of the University of California. All rights reserved. 39 * (c) UNIX System Laboratories, Inc. 40 * All or some portions of this file are derived from material licensed 41 * to the University of California by American Telephone and Telegraph 42 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 43 * the permission of UNIX System Laboratories, Inc. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. Neither the name of the University nor the names of its contributors 54 * may be used to endorse or promote products derived from this software 55 * without specific prior written permission. 56 * 57 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 58 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 59 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 60 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 61 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 62 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 63 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 64 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 65 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 66 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 67 * SUCH DAMAGE. 68 */ 69 70 #include <sys/cdefs.h> 71 #ifndef lint 72 __RCSID("$NetBSD: setemul.c,v 1.25 2007/12/31 15:26:31 ad Exp $"); 73 #endif /* not lint */ 74 75 #include <sys/param.h> 76 #include <sys/errno.h> 77 #include <sys/time.h> 78 #include <sys/queue.h> 79 80 #include <err.h> 81 #include <stdio.h> 82 #include <stdlib.h> 83 #include <string.h> 84 #include <unistd.h> 85 #include <vis.h> 86 87 #include "setemul.h" 88 89 #include <sys/syscall.h> 90 91 #include "../../sys/compat/netbsd32/netbsd32_syscall.h" 92 #include "../../sys/compat/freebsd/freebsd_syscall.h" 93 #include "../../sys/compat/ibcs2/ibcs2_syscall.h" 94 #include "../../sys/compat/irix/irix_syscall.h" 95 #include "../../sys/compat/linux/linux_syscall.h" 96 #include "../../sys/compat/linux32/linux32_syscall.h" 97 #include "../../sys/compat/mach/mach_syscall.h" 98 #include "../../sys/compat/darwin/darwin_syscall.h" 99 #include "../../sys/compat/mach/arch/powerpc/ppccalls/mach_ppccalls_syscall.h" 100 #include "../../sys/compat/mach/arch/powerpc/fasttraps/mach_fasttraps_syscall.h" 101 #include "../../sys/compat/osf1/osf1_syscall.h" 102 #include "../../sys/compat/sunos32/sunos32_syscall.h" 103 #include "../../sys/compat/sunos/sunos_syscall.h" 104 #include "../../sys/compat/svr4/svr4_syscall.h" 105 #include "../../sys/compat/svr4_32/svr4_32_syscall.h" 106 #include "../../sys/compat/ultrix/ultrix_syscall.h" 107 #ifdef __m68k__ 108 #include "../../sys/compat/aoutm68k/aoutm68k_syscall.h" 109 #endif 110 111 #define KTRACE 112 #include "../../sys/kern/syscalls.c" 113 114 #include "../../sys/compat/netbsd32/netbsd32_syscalls.c" 115 #include "../../sys/compat/freebsd/freebsd_syscalls.c" 116 #include "../../sys/compat/ibcs2/ibcs2_syscalls.c" 117 #include "../../sys/compat/irix/irix_syscalls.c" 118 #include "../../sys/compat/linux/linux_syscalls.c" 119 #include "../../sys/compat/linux32/linux32_syscalls.c" 120 #include "../../sys/compat/darwin/darwin_syscalls.c" 121 #include "../../sys/compat/mach/mach_syscalls.c" 122 #include "../../sys/compat/mach/arch/powerpc/ppccalls/mach_ppccalls_syscalls.c" 123 #include "../../sys/compat/mach/arch/powerpc/fasttraps/mach_fasttraps_syscalls.c" 124 #include "../../sys/compat/osf1/osf1_syscalls.c" 125 #include "../../sys/compat/sunos/sunos_syscalls.c" 126 #include "../../sys/compat/sunos32/sunos32_syscalls.c" 127 #include "../../sys/compat/svr4/svr4_syscalls.c" 128 #include "../../sys/compat/svr4_32/svr4_32_syscalls.c" 129 #include "../../sys/compat/ultrix/ultrix_syscalls.c" 130 #ifdef __m68k__ 131 #include "../../sys/compat/aoutm68k/aoutm68k_syscalls.c" 132 #endif 133 134 #include "../../sys/compat/svr4/svr4_errno.c" 135 #include "../../sys/compat/ibcs2/ibcs2_errno.c" 136 #include "../../sys/compat/irix/irix_errno.c" 137 #include "../../sys/compat/osf1/osf1_errno.c" 138 #include "../../sys/compat/linux/common/linux_errno.c" 139 #undef KTRACE 140 141 #define SIGRTMIN 33 /* XXX */ 142 #include "../../sys/compat/svr4/svr4_signo.c" 143 #include "../../sys/compat/ibcs2/ibcs2_signo.c" 144 /* irix uses svr4 */ 145 #include "../../sys/compat/osf1/osf1_signo.c" 146 #include "../../sys/compat/linux/common/linux_signo.c" 147 148 /* For Mach services names in MMSG traces */ 149 #ifndef LETS_GET_SMALL 150 #include "../../sys/compat/mach/mach_services_names.c" 151 #endif 152 153 #define NELEM(a) (sizeof(a) / sizeof(a[0])) 154 155 /* static */ 156 const struct emulation emulations[] = { 157 { "netbsd", syscallnames, SYS_MAXSYSCALL, 158 NULL, 0, 159 NULL, 0, 0 }, 160 161 { "netbsd32", netbsd32_syscallnames, SYS_MAXSYSCALL, 162 NULL, 0, 163 NULL, 0, EMUL_FLAG_NETBSD32 }, 164 165 { "freebsd", freebsd_syscallnames, FREEBSD_SYS_MAXSYSCALL, 166 NULL, 0, 167 NULL, 0, 0 }, 168 169 { "ibcs2", ibcs2_syscallnames, IBCS2_SYS_MAXSYSCALL, 170 native_to_ibcs2_errno, NELEM(native_to_ibcs2_errno), 171 ibcs2_to_native_signo, NSIG, 0 }, 172 173 { "irix o32", irix_syscallnames, IRIX_SYS_MAXSYSCALL, 174 native_to_irix_errno, NELEM(native_to_irix_errno), 175 svr4_to_native_signo, NSIG, 0 }, 176 177 { "irix n32", irix_syscallnames, IRIX_SYS_MAXSYSCALL, 178 native_to_irix_errno, NELEM(native_to_irix_errno), 179 svr4_to_native_signo, NSIG, 0 }, 180 181 { "linux", linux_syscallnames, LINUX_SYS_MAXSYSCALL, 182 native_to_linux_errno, NELEM(native_to_linux_errno), 183 linux_to_native_signo, NSIG, 0 }, 184 185 { "linux32", linux32_syscallnames, LINUX32_SYS_MAXSYSCALL, 186 native_to_linux_errno, NELEM(native_to_linux_errno), 187 linux_to_native_signo, NSIG, EMUL_FLAG_NETBSD32 }, 188 189 { "darwin", darwin_syscallnames, DARWIN_SYS_MAXSYSCALL, 190 NULL, 0, 191 NULL, 0, 0 }, 192 193 { "mach", mach_syscallnames, MACH_SYS_MAXSYSCALL, 194 NULL, 0, 195 NULL, 0, 0 }, 196 197 { "mach ppccalls", mach_ppccalls_syscallnames, 198 MACH_PPCCALLS_SYS_MAXSYSCALL, 199 NULL, 0, 200 NULL, 0, 0 }, 201 202 { "mach fasttraps", mach_fasttraps_syscallnames, 203 MACH_FASTTRAPS_SYS_MAXSYSCALL, 204 NULL, 0, 205 NULL, 0, 0 }, 206 207 { "osf1", osf1_syscallnames, OSF1_SYS_MAXSYSCALL, 208 native_to_osf1_errno, NELEM(native_to_osf1_errno), 209 osf1_to_native_signo, NSIG, 0 }, 210 211 { "sunos32", sunos32_syscallnames, SUNOS32_SYS_MAXSYSCALL, 212 NULL, 0, 213 NULL, 0, EMUL_FLAG_NETBSD32 }, 214 215 { "sunos", sunos_syscallnames, SUNOS_SYS_MAXSYSCALL, 216 NULL, 0, 217 NULL, 0, 0 }, 218 219 { "svr4", svr4_syscallnames, SVR4_SYS_MAXSYSCALL, 220 native_to_svr4_errno, NELEM(native_to_svr4_errno), 221 svr4_to_native_signo, NSIG, 0 }, 222 223 { "svr4_32", svr4_syscallnames, SVR4_SYS_MAXSYSCALL, 224 native_to_svr4_errno, NELEM(native_to_svr4_errno), 225 svr4_to_native_signo, NSIG, EMUL_FLAG_NETBSD32 }, 226 227 { "ultrix", ultrix_syscallnames, ULTRIX_SYS_MAXSYSCALL, 228 NULL, 0, 229 NULL, 0, 0 }, 230 231 { "pecoff", syscallnames, SYS_MAXSYSCALL, 232 NULL, 0, 233 NULL, 0, 0 }, 234 235 #ifdef __m68k__ 236 { "aoutm68k", aoutm68k_syscallnames, AOUTM68K_SYS_MAXSYSCALL, 237 NULL, 0, 238 NULL, 0, 0 }, 239 #endif 240 241 { NULL, NULL, 0, 242 NULL, 0, 243 NULL, 0, 0 } 244 }; 245 246 struct emulation_ctx { 247 pid_t pid; 248 const struct emulation *emulation; 249 LIST_ENTRY(emulation_ctx) ctx_link; 250 }; 251 252 const struct emulation *cur_emul; 253 const struct emulation *prev_emul; 254 /* Mach emulation require extra emulation contexts */ 255 static const struct emulation *mach; 256 static const struct emulation *mach_ppccalls; 257 static const struct emulation *mach_fasttraps; 258 259 static const struct emulation *default_emul = &emulations[0]; 260 261 struct emulation_ctx *current_ctx; 262 static LIST_HEAD(, emulation_ctx) emul_ctx = 263 LIST_HEAD_INITIALIZER(emul_ctx); 264 265 static struct emulation_ctx *ectx_find(pid_t); 266 static void ectx_update(pid_t, const struct emulation *); 267 268 void 269 setemul(const char *name, pid_t pid, int update_ectx) 270 { 271 int i; 272 const struct emulation *match = NULL; 273 274 for (i = 0; emulations[i].name != NULL; i++) { 275 if (strcmp(emulations[i].name, name) == 0) { 276 match = &emulations[i]; 277 break; 278 } 279 } 280 281 if (!match) { 282 warnx("Emulation `%s' unknown", name); 283 return; 284 } 285 286 if (update_ectx) 287 ectx_update(pid, match); 288 else 289 default_emul = match; 290 291 if (cur_emul != NULL) 292 prev_emul = cur_emul; 293 else 294 prev_emul = match; 295 296 cur_emul = match; 297 } 298 299 /* 300 * Emulation context list is very simple chained list, not even hashed. 301 * We expect the number of separate traced contexts/processes to be 302 * fairly low, so it's not worth it to optimize this. 303 * MMMmmmm not when I use it, it is only bounded PID_MAX! 304 * Requeue looked up item at start of list to cache result since the 305 * trace file tendes to have a burst of calls for a single process. 306 */ 307 308 /* 309 * Find an emulation context appropriate for the given pid. 310 */ 311 static struct emulation_ctx * 312 ectx_find(pid_t pid) 313 { 314 struct emulation_ctx *ctx; 315 316 /* Find an existing entry */ 317 LIST_FOREACH(ctx, &emul_ctx, ctx_link) { 318 if (ctx->pid == pid) 319 break; 320 } 321 322 if (ctx == NULL) { 323 /* create entry with default emulation */ 324 ctx = malloc(sizeof *ctx); 325 if (ctx == NULL) 326 err(1, "malloc emul context"); 327 ctx->pid = pid; 328 ctx->emulation = default_emul; 329 330 /* chain into the list */ 331 LIST_INSERT_HEAD(&emul_ctx, ctx, ctx_link); 332 } else { 333 /* move entry to head to optimize lookup for syscall bursts */ 334 LIST_REMOVE(ctx, ctx_link); 335 LIST_INSERT_HEAD(&emul_ctx, ctx, ctx_link); 336 } 337 338 return ctx; 339 } 340 341 /* 342 * Update emulation context for given pid, or create new if no context 343 * for this pid exists. 344 */ 345 static void 346 ectx_update(pid_t pid, const struct emulation *emul) 347 { 348 struct emulation_ctx *ctx; 349 350 ctx = ectx_find(pid); 351 ctx->emulation = emul; 352 } 353 354 /* 355 * Ensure current emulation context is correct for given pid. 356 */ 357 void 358 ectx_sanify(pid_t pid) 359 { 360 struct emulation_ctx *ctx; 361 362 ctx = ectx_find(pid); 363 cur_emul = ctx->emulation; 364 } 365 366 /* 367 * Delete emulation context for current pid. 368 * (eg when tracing exit()) 369 * Defer delete just in case we've cached a pointer... 370 */ 371 void 372 ectx_delete(void) 373 { 374 static struct emulation_ctx *ctx = NULL; 375 376 if (ctx != NULL) 377 free(ctx); 378 379 /* 380 * The emulation for current syscall entry is always on HEAD, due 381 * to code in ectx_find(). 382 */ 383 ctx = LIST_FIRST(&emul_ctx); 384 385 if (ctx) 386 LIST_REMOVE(ctx, ctx_link); 387 } 388 389 /* 390 * Temporarily modify code and emulations to handle Mach traps 391 * XXX The define are duplicated from sys/arch/powerpc/include/mach_syscall.c 392 */ 393 #define MACH_FASTTRAPS 0x00007ff0 394 #define MACH_PPCCALLS 0x00006000 395 #define MACH_ODD_SYSCALL_MASK 0x0000fff0 396 int 397 mach_traps_dispatch(int *code, const struct emulation **emul) 398 { 399 switch (*code & MACH_ODD_SYSCALL_MASK) { 400 case MACH_FASTTRAPS: 401 *emul = mach_fasttraps; 402 *code -= MACH_FASTTRAPS; 403 return 1; 404 405 case MACH_PPCCALLS: 406 *emul = mach_ppccalls; 407 *code -= MACH_PPCCALLS; 408 return 1; 409 410 default: 411 if (*code < 0 && *code > -MACH_SYS_MAXSYSCALL) { 412 *emul = mach; 413 *code = -*code; 414 return 1; 415 } 416 return 0; 417 } 418 } 419 420 /* 421 * Lookup Machs emulations 422 */ 423 void 424 mach_lookup_emul(void) 425 { 426 const struct emulation *emul_idx; 427 428 for (emul_idx = emulations; emul_idx->name; emul_idx++) { 429 if (strcmp("mach", emul_idx->name) == 0) 430 mach = emul_idx; 431 if (strcmp("mach fasttraps", emul_idx->name) == 0) 432 mach_fasttraps = emul_idx; 433 if (strcmp("mach ppccalls", emul_idx->name) == 0) 434 mach_ppccalls = emul_idx; 435 } 436 if (mach == NULL || mach_fasttraps == NULL || mach_ppccalls == NULL) { 437 errx(1, "Cannot load mach emulations"); 438 exit(1); 439 } 440 return; 441 } 442 443 /* 444 * Find the name of the Mach service responsible to a given message Id 445 */ 446 const char * 447 mach_service_name(id) 448 int id; 449 { 450 const char *retval = NULL; 451 #ifndef LETS_GET_SMALL 452 struct mach_service_name *srv; 453 454 for (srv = mach_services_names; srv->srv_id; srv++) 455 if (srv->srv_id == id) 456 break; 457 retval = srv->srv_name; 458 #endif /* LETS_GET_SMALL */ 459 460 return retval; 461 } 462