1 /* 2 * qemu bsd user main 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright (c) 2013-14 Stacey Son 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include <sys/types.h> 22 #include <sys/time.h> 23 #include <sys/resource.h> 24 #include <sys/sysctl.h> 25 26 #include "qemu/osdep.h" 27 #include "qemu-common.h" 28 #include "qemu/units.h" 29 #include "qemu/accel.h" 30 #include "sysemu/tcg.h" 31 #include "qemu-version.h" 32 #include <machine/trap.h> 33 34 #include "qapi/error.h" 35 #include "qemu.h" 36 #include "qemu/config-file.h" 37 #include "qemu/error-report.h" 38 #include "qemu/path.h" 39 #include "qemu/help_option.h" 40 #include "qemu/module.h" 41 #include "exec/exec-all.h" 42 #include "tcg/tcg.h" 43 #include "qemu/timer.h" 44 #include "qemu/envlist.h" 45 #include "qemu/cutils.h" 46 #include "exec/log.h" 47 #include "trace/control.h" 48 #include "crypto/init.h" 49 #include "qemu/guest-random.h" 50 51 #include "host-os.h" 52 #include "target_arch_cpu.h" 53 54 int singlestep; 55 unsigned long mmap_min_addr; 56 uintptr_t guest_base; 57 bool have_guest_base; 58 unsigned long reserved_va; 59 60 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; 61 const char *qemu_uname_release; 62 enum BSDType bsd_type; 63 char qemu_proc_pathname[PATH_MAX]; /* full path to exeutable */ 64 65 unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */ 66 unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */ 67 unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */ 68 unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */ 69 unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */ 70 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */ 71 72 /* Helper routines for implementing atomic operations. */ 73 74 void fork_start(void) 75 { 76 start_exclusive(); 77 cpu_list_lock(); 78 mmap_fork_start(); 79 } 80 81 void fork_end(int child) 82 { 83 if (child) { 84 CPUState *cpu, *next_cpu; 85 /* 86 * Child processes created by fork() only have a single thread. Discard 87 * information about the parent threads. 88 */ 89 CPU_FOREACH_SAFE(cpu, next_cpu) { 90 if (cpu != thread_cpu) { 91 QTAILQ_REMOVE_RCU(&cpus, cpu, node); 92 } 93 } 94 mmap_fork_end(child); 95 /* 96 * qemu_init_cpu_list() takes care of reinitializing the exclusive 97 * state, so we don't need to end_exclusive() here. 98 */ 99 qemu_init_cpu_list(); 100 gdbserver_fork(thread_cpu); 101 } else { 102 mmap_fork_end(child); 103 cpu_list_unlock(); 104 end_exclusive(); 105 } 106 } 107 108 void cpu_loop(CPUArchState *env) 109 { 110 target_cpu_loop(env); 111 } 112 113 static void usage(void) 114 { 115 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 116 "\n" QEMU_COPYRIGHT "\n" 117 "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 118 "BSD CPU emulator (compiled for %s emulation)\n" 119 "\n" 120 "Standard options:\n" 121 "-h print this help\n" 122 "-g port wait gdb connection to port\n" 123 "-L path set the elf interpreter prefix (default=%s)\n" 124 "-s size set the stack size in bytes (default=%ld)\n" 125 "-cpu model select CPU (-cpu help for list)\n" 126 "-drop-ld-preload drop LD_PRELOAD for target process\n" 127 "-E var=value sets/modifies targets environment variable(s)\n" 128 "-U var unsets targets environment variable(s)\n" 129 "-B address set guest_base address to address\n" 130 "-bsd type select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n" 131 "\n" 132 "Debug options:\n" 133 "-d item1[,...] enable logging of specified items\n" 134 " (use '-d help' for a list of log items)\n" 135 "-D logfile write logs to 'logfile' (default stderr)\n" 136 "-singlestep always run in singlestep mode\n" 137 "-strace log system calls\n" 138 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 139 " specify tracing options\n" 140 "\n" 141 "Environment variables:\n" 142 "QEMU_STRACE Print system calls and arguments similar to the\n" 143 " 'strace' program. Enable by setting to any value.\n" 144 "You can use -E and -U options to set/unset environment variables\n" 145 "for target process. It is possible to provide several variables\n" 146 "by repeating the option. For example:\n" 147 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 148 "Note that if you provide several changes to single variable\n" 149 "last change will stay in effect.\n" 150 "\n" 151 QEMU_HELP_BOTTOM "\n" 152 , 153 TARGET_NAME, 154 interp_prefix, 155 target_dflssiz); 156 exit(1); 157 } 158 159 __thread CPUState *thread_cpu; 160 161 bool qemu_cpu_is_self(CPUState *cpu) 162 { 163 return thread_cpu == cpu; 164 } 165 166 void qemu_cpu_kick(CPUState *cpu) 167 { 168 cpu_exit(cpu); 169 } 170 171 /* Assumes contents are already zeroed. */ 172 void init_task_state(TaskState *ts) 173 { 174 int i; 175 176 ts->used = 1; 177 ts->first_free = ts->sigqueue_table; 178 for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) { 179 ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1]; 180 } 181 ts->sigqueue_table[i].next = NULL; 182 } 183 184 void gemu_log(const char *fmt, ...) 185 { 186 va_list ap; 187 188 va_start(ap, fmt); 189 vfprintf(stderr, fmt, ap); 190 va_end(ap); 191 } 192 193 static void 194 adjust_ssize(void) 195 { 196 struct rlimit rl; 197 198 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 199 return; 200 } 201 202 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 203 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 204 205 rl.rlim_max = target_maxssiz; 206 rl.rlim_cur = target_dflssiz; 207 setrlimit(RLIMIT_STACK, &rl); 208 } 209 210 static void save_proc_pathname(char *argv0) 211 { 212 int mib[4]; 213 size_t len; 214 215 mib[0] = CTL_KERN; 216 mib[1] = KERN_PROC; 217 mib[2] = KERN_PROC_PATHNAME; 218 mib[3] = -1; 219 220 len = sizeof(qemu_proc_pathname); 221 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 222 perror("sysctl"); 223 } 224 } 225 226 int main(int argc, char **argv) 227 { 228 const char *filename; 229 const char *cpu_model; 230 const char *cpu_type; 231 const char *log_file = NULL; 232 const char *log_mask = NULL; 233 const char *seed_optarg = NULL; 234 struct target_pt_regs regs1, *regs = ®s1; 235 struct image_info info1, *info = &info1; 236 struct bsd_binprm bprm; 237 TaskState *ts; 238 CPUArchState *env; 239 CPUState *cpu; 240 int optind, rv; 241 const char *r; 242 const char *gdbstub = NULL; 243 char **target_environ, **wrk; 244 envlist_t *envlist = NULL; 245 bsd_type = HOST_DEFAULT_BSD_TYPE; 246 247 adjust_ssize(); 248 249 if (argc <= 1) { 250 usage(); 251 } 252 253 save_proc_pathname(argv[0]); 254 255 error_init(argv[0]); 256 module_call_init(MODULE_INIT_TRACE); 257 qemu_init_cpu_list(); 258 module_call_init(MODULE_INIT_QOM); 259 260 envlist = envlist_create(); 261 262 /* add current environment into the list */ 263 for (wrk = environ; *wrk != NULL; wrk++) { 264 (void) envlist_setenv(envlist, *wrk); 265 } 266 267 cpu_model = NULL; 268 269 qemu_add_opts(&qemu_trace_opts); 270 271 optind = 1; 272 for (;;) { 273 if (optind >= argc) { 274 break; 275 } 276 r = argv[optind]; 277 if (r[0] != '-') { 278 break; 279 } 280 optind++; 281 r++; 282 if (!strcmp(r, "-")) { 283 break; 284 } else if (!strcmp(r, "d")) { 285 if (optind >= argc) { 286 break; 287 } 288 log_mask = argv[optind++]; 289 } else if (!strcmp(r, "D")) { 290 if (optind >= argc) { 291 break; 292 } 293 log_file = argv[optind++]; 294 } else if (!strcmp(r, "E")) { 295 r = argv[optind++]; 296 if (envlist_setenv(envlist, r) != 0) { 297 usage(); 298 } 299 } else if (!strcmp(r, "ignore-environment")) { 300 envlist_free(envlist); 301 envlist = envlist_create(); 302 } else if (!strcmp(r, "U")) { 303 r = argv[optind++]; 304 if (envlist_unsetenv(envlist, r) != 0) { 305 usage(); 306 } 307 } else if (!strcmp(r, "s")) { 308 r = argv[optind++]; 309 rv = qemu_strtoul(r, &r, 0, &target_dflssiz); 310 if (rv < 0 || target_dflssiz <= 0) { 311 usage(); 312 } 313 if (*r == 'M') { 314 target_dflssiz *= 1024 * 1024; 315 } else if (*r == 'k' || *r == 'K') { 316 target_dflssiz *= 1024; 317 } 318 if (target_dflssiz > target_maxssiz) { 319 usage(); 320 } 321 } else if (!strcmp(r, "L")) { 322 interp_prefix = argv[optind++]; 323 } else if (!strcmp(r, "p")) { 324 qemu_host_page_size = atoi(argv[optind++]); 325 if (qemu_host_page_size == 0 || 326 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 327 fprintf(stderr, "page size must be a power of two\n"); 328 exit(1); 329 } 330 } else if (!strcmp(r, "g")) { 331 gdbstub = g_strdup(argv[optind++]); 332 } else if (!strcmp(r, "r")) { 333 qemu_uname_release = argv[optind++]; 334 } else if (!strcmp(r, "cpu")) { 335 cpu_model = argv[optind++]; 336 if (is_help_option(cpu_model)) { 337 /* XXX: implement xxx_cpu_list for targets that still miss it */ 338 #if defined(cpu_list) 339 cpu_list(); 340 #endif 341 exit(1); 342 } 343 } else if (!strcmp(r, "B")) { 344 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 345 if (rv < 0) { 346 usage(); 347 } 348 have_guest_base = true; 349 } else if (!strcmp(r, "drop-ld-preload")) { 350 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 351 } else if (!strcmp(r, "bsd")) { 352 if (!strcasecmp(argv[optind], "freebsd")) { 353 bsd_type = target_freebsd; 354 } else if (!strcasecmp(argv[optind], "netbsd")) { 355 bsd_type = target_netbsd; 356 } else if (!strcasecmp(argv[optind], "openbsd")) { 357 bsd_type = target_openbsd; 358 } else { 359 usage(); 360 } 361 optind++; 362 } else if (!strcmp(r, "seed")) { 363 seed_optarg = optarg; 364 } else if (!strcmp(r, "singlestep")) { 365 singlestep = 1; 366 } else if (!strcmp(r, "strace")) { 367 do_strace = 1; 368 } else if (!strcmp(r, "trace")) { 369 trace_opt_parse(optarg); 370 } else { 371 usage(); 372 } 373 } 374 375 /* init debug */ 376 qemu_log_needs_buffers(); 377 qemu_set_log_filename(log_file, &error_fatal); 378 if (log_mask) { 379 int mask; 380 381 mask = qemu_str_to_log_mask(log_mask); 382 if (!mask) { 383 qemu_print_log_usage(stdout); 384 exit(1); 385 } 386 qemu_set_log(mask); 387 } 388 389 if (optind >= argc) { 390 usage(); 391 } 392 filename = argv[optind]; 393 394 if (!trace_init_backends()) { 395 exit(1); 396 } 397 trace_init_file(); 398 399 /* Zero out regs */ 400 memset(regs, 0, sizeof(struct target_pt_regs)); 401 402 /* Zero bsd params */ 403 memset(&bprm, 0, sizeof(bprm)); 404 405 /* Zero out image_info */ 406 memset(info, 0, sizeof(struct image_info)); 407 408 /* Scan interp_prefix dir for replacement files. */ 409 init_paths(interp_prefix); 410 411 if (cpu_model == NULL) { 412 cpu_model = TARGET_DEFAULT_CPU_MODEL; 413 } 414 415 cpu_type = parse_cpu_option(cpu_model); 416 417 /* init tcg before creating CPUs and to get qemu_host_page_size */ 418 { 419 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 420 421 accel_init_interfaces(ac); 422 ac->init_machine(NULL); 423 } 424 cpu = cpu_create(cpu_type); 425 env = cpu->env_ptr; 426 cpu_reset(cpu); 427 thread_cpu = cpu; 428 429 if (getenv("QEMU_STRACE")) { 430 do_strace = 1; 431 } 432 433 target_environ = envlist_to_environ(envlist, NULL); 434 envlist_free(envlist); 435 436 { 437 Error *err = NULL; 438 if (seed_optarg != NULL) { 439 qemu_guest_random_seed_main(seed_optarg, &err); 440 } else { 441 qcrypto_init(&err); 442 } 443 if (err) { 444 error_reportf_err(err, "cannot initialize crypto: "); 445 exit(1); 446 } 447 } 448 449 /* 450 * Now that page sizes are configured we can do 451 * proper page alignment for guest_base. 452 */ 453 guest_base = HOST_PAGE_ALIGN(guest_base); 454 455 if (loader_exec(filename, argv + optind, target_environ, regs, info, 456 &bprm) != 0) { 457 printf("Error loading %s\n", filename); 458 _exit(1); 459 } 460 461 for (wrk = target_environ; *wrk; wrk++) { 462 g_free(*wrk); 463 } 464 465 g_free(target_environ); 466 467 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 468 qemu_log("guest_base %p\n", (void *)guest_base); 469 log_page_dump("binary load"); 470 471 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); 472 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); 473 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", 474 info->start_code); 475 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", 476 info->start_data); 477 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); 478 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", 479 info->start_stack); 480 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 481 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 482 } 483 484 /* build Task State */ 485 ts = g_new0(TaskState, 1); 486 init_task_state(ts); 487 ts->info = info; 488 ts->bprm = &bprm; 489 cpu->opaque = ts; 490 491 target_set_brk(info->brk); 492 syscall_init(); 493 signal_init(); 494 495 /* 496 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 497 * generating the prologue until now so that the prologue can take 498 * the real value of GUEST_BASE into account. 499 */ 500 tcg_prologue_init(tcg_ctx); 501 502 target_cpu_init(env, regs); 503 504 if (gdbstub) { 505 gdbserver_start(gdbstub); 506 gdb_handlesig(cpu, 0); 507 } 508 cpu_loop(env); 509 /* never exits */ 510 return 0; 511 } 512