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 char *argv0 = NULL; 247 248 adjust_ssize(); 249 250 if (argc <= 1) { 251 usage(); 252 } 253 254 save_proc_pathname(argv[0]); 255 256 error_init(argv[0]); 257 module_call_init(MODULE_INIT_TRACE); 258 qemu_init_cpu_list(); 259 module_call_init(MODULE_INIT_QOM); 260 261 envlist = envlist_create(); 262 263 /* add current environment into the list */ 264 for (wrk = environ; *wrk != NULL; wrk++) { 265 (void) envlist_setenv(envlist, *wrk); 266 } 267 268 cpu_model = NULL; 269 270 qemu_add_opts(&qemu_trace_opts); 271 272 optind = 1; 273 for (;;) { 274 if (optind >= argc) { 275 break; 276 } 277 r = argv[optind]; 278 if (r[0] != '-') { 279 break; 280 } 281 optind++; 282 r++; 283 if (!strcmp(r, "-")) { 284 break; 285 } else if (!strcmp(r, "d")) { 286 if (optind >= argc) { 287 break; 288 } 289 log_mask = argv[optind++]; 290 } else if (!strcmp(r, "D")) { 291 if (optind >= argc) { 292 break; 293 } 294 log_file = argv[optind++]; 295 } else if (!strcmp(r, "E")) { 296 r = argv[optind++]; 297 if (envlist_setenv(envlist, r) != 0) { 298 usage(); 299 } 300 } else if (!strcmp(r, "ignore-environment")) { 301 envlist_free(envlist); 302 envlist = envlist_create(); 303 } else if (!strcmp(r, "U")) { 304 r = argv[optind++]; 305 if (envlist_unsetenv(envlist, r) != 0) { 306 usage(); 307 } 308 } else if (!strcmp(r, "s")) { 309 r = argv[optind++]; 310 rv = qemu_strtoul(r, &r, 0, &target_dflssiz); 311 if (rv < 0 || target_dflssiz <= 0) { 312 usage(); 313 } 314 if (*r == 'M') { 315 target_dflssiz *= 1024 * 1024; 316 } else if (*r == 'k' || *r == 'K') { 317 target_dflssiz *= 1024; 318 } 319 if (target_dflssiz > target_maxssiz) { 320 usage(); 321 } 322 } else if (!strcmp(r, "L")) { 323 interp_prefix = argv[optind++]; 324 } else if (!strcmp(r, "p")) { 325 qemu_host_page_size = atoi(argv[optind++]); 326 if (qemu_host_page_size == 0 || 327 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 328 fprintf(stderr, "page size must be a power of two\n"); 329 exit(1); 330 } 331 } else if (!strcmp(r, "g")) { 332 gdbstub = g_strdup(argv[optind++]); 333 } else if (!strcmp(r, "r")) { 334 qemu_uname_release = argv[optind++]; 335 } else if (!strcmp(r, "cpu")) { 336 cpu_model = argv[optind++]; 337 if (is_help_option(cpu_model)) { 338 /* XXX: implement xxx_cpu_list for targets that still miss it */ 339 #if defined(cpu_list) 340 cpu_list(); 341 #endif 342 exit(1); 343 } 344 } else if (!strcmp(r, "B")) { 345 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 346 if (rv < 0) { 347 usage(); 348 } 349 have_guest_base = true; 350 } else if (!strcmp(r, "drop-ld-preload")) { 351 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 352 } else if (!strcmp(r, "bsd")) { 353 if (!strcasecmp(argv[optind], "freebsd")) { 354 bsd_type = target_freebsd; 355 } else if (!strcasecmp(argv[optind], "netbsd")) { 356 bsd_type = target_netbsd; 357 } else if (!strcasecmp(argv[optind], "openbsd")) { 358 bsd_type = target_openbsd; 359 } else { 360 usage(); 361 } 362 optind++; 363 } else if (!strcmp(r, "seed")) { 364 seed_optarg = optarg; 365 } else if (!strcmp(r, "singlestep")) { 366 singlestep = 1; 367 } else if (!strcmp(r, "strace")) { 368 do_strace = 1; 369 } else if (!strcmp(r, "trace")) { 370 trace_opt_parse(optarg); 371 } else if (!strcmp(r, "0")) { 372 argv0 = argv[optind++]; 373 } else { 374 usage(); 375 } 376 } 377 378 /* init debug */ 379 qemu_log_needs_buffers(); 380 qemu_set_log_filename(log_file, &error_fatal); 381 if (log_mask) { 382 int mask; 383 384 mask = qemu_str_to_log_mask(log_mask); 385 if (!mask) { 386 qemu_print_log_usage(stdout); 387 exit(1); 388 } 389 qemu_set_log(mask); 390 } 391 392 if (optind >= argc) { 393 usage(); 394 } 395 filename = argv[optind]; 396 if (argv0) { 397 argv[optind] = argv0; 398 } 399 400 if (!trace_init_backends()) { 401 exit(1); 402 } 403 trace_init_file(); 404 405 /* Zero out regs */ 406 memset(regs, 0, sizeof(struct target_pt_regs)); 407 408 /* Zero bsd params */ 409 memset(&bprm, 0, sizeof(bprm)); 410 411 /* Zero out image_info */ 412 memset(info, 0, sizeof(struct image_info)); 413 414 /* Scan interp_prefix dir for replacement files. */ 415 init_paths(interp_prefix); 416 417 if (cpu_model == NULL) { 418 cpu_model = TARGET_DEFAULT_CPU_MODEL; 419 } 420 421 cpu_type = parse_cpu_option(cpu_model); 422 423 /* init tcg before creating CPUs and to get qemu_host_page_size */ 424 { 425 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 426 427 accel_init_interfaces(ac); 428 ac->init_machine(NULL); 429 } 430 cpu = cpu_create(cpu_type); 431 env = cpu->env_ptr; 432 cpu_reset(cpu); 433 thread_cpu = cpu; 434 435 if (getenv("QEMU_STRACE")) { 436 do_strace = 1; 437 } 438 439 target_environ = envlist_to_environ(envlist, NULL); 440 envlist_free(envlist); 441 442 { 443 Error *err = NULL; 444 if (seed_optarg != NULL) { 445 qemu_guest_random_seed_main(seed_optarg, &err); 446 } else { 447 qcrypto_init(&err); 448 } 449 if (err) { 450 error_reportf_err(err, "cannot initialize crypto: "); 451 exit(1); 452 } 453 } 454 455 /* 456 * Now that page sizes are configured we can do 457 * proper page alignment for guest_base. 458 */ 459 guest_base = HOST_PAGE_ALIGN(guest_base); 460 461 if (loader_exec(filename, argv + optind, target_environ, regs, info, 462 &bprm) != 0) { 463 printf("Error loading %s\n", filename); 464 _exit(1); 465 } 466 467 for (wrk = target_environ; *wrk; wrk++) { 468 g_free(*wrk); 469 } 470 471 g_free(target_environ); 472 473 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 474 qemu_log("guest_base %p\n", (void *)guest_base); 475 log_page_dump("binary load"); 476 477 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); 478 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); 479 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", 480 info->start_code); 481 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", 482 info->start_data); 483 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); 484 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", 485 info->start_stack); 486 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 487 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 488 } 489 490 /* build Task State */ 491 ts = g_new0(TaskState, 1); 492 init_task_state(ts); 493 ts->info = info; 494 ts->bprm = &bprm; 495 cpu->opaque = ts; 496 497 target_set_brk(info->brk); 498 syscall_init(); 499 signal_init(); 500 501 /* 502 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 503 * generating the prologue until now so that the prologue can take 504 * the real value of GUEST_BASE into account. 505 */ 506 tcg_prologue_init(tcg_ctx); 507 508 target_cpu_init(env, regs); 509 510 if (gdbstub) { 511 gdbserver_start(gdbstub); 512 gdb_handlesig(cpu, 0); 513 } 514 cpu_loop(env); 515 /* never exits */ 516 return 0; 517 } 518