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 void gemu_log(const char *fmt, ...) 73 { 74 va_list ap; 75 76 va_start(ap, fmt); 77 vfprintf(stderr, fmt, ap); 78 va_end(ap); 79 } 80 81 void fork_start(void) 82 { 83 } 84 85 void fork_end(int child) 86 { 87 if (child) { 88 gdbserver_fork(thread_cpu); 89 } 90 } 91 92 void cpu_loop(CPUArchState *env) 93 { 94 target_cpu_loop(env); 95 } 96 97 static void usage(void) 98 { 99 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 100 "\n" QEMU_COPYRIGHT "\n" 101 "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 102 "BSD CPU emulator (compiled for %s emulation)\n" 103 "\n" 104 "Standard options:\n" 105 "-h print this help\n" 106 "-g port wait gdb connection to port\n" 107 "-L path set the elf interpreter prefix (default=%s)\n" 108 "-s size set the stack size in bytes (default=%ld)\n" 109 "-cpu model select CPU (-cpu help for list)\n" 110 "-drop-ld-preload drop LD_PRELOAD for target process\n" 111 "-E var=value sets/modifies targets environment variable(s)\n" 112 "-U var unsets targets environment variable(s)\n" 113 "-B address set guest_base address to address\n" 114 "-bsd type select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n" 115 "\n" 116 "Debug options:\n" 117 "-d item1[,...] enable logging of specified items\n" 118 " (use '-d help' for a list of log items)\n" 119 "-D logfile write logs to 'logfile' (default stderr)\n" 120 "-singlestep always run in singlestep mode\n" 121 "-strace log system calls\n" 122 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 123 " specify tracing options\n" 124 "\n" 125 "Environment variables:\n" 126 "QEMU_STRACE Print system calls and arguments similar to the\n" 127 " 'strace' program. Enable by setting to any value.\n" 128 "You can use -E and -U options to set/unset environment variables\n" 129 "for target process. It is possible to provide several variables\n" 130 "by repeating the option. For example:\n" 131 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 132 "Note that if you provide several changes to single variable\n" 133 "last change will stay in effect.\n" 134 "\n" 135 QEMU_HELP_BOTTOM "\n" 136 , 137 TARGET_NAME, 138 interp_prefix, 139 target_dflssiz); 140 exit(1); 141 } 142 143 __thread CPUState *thread_cpu; 144 145 bool qemu_cpu_is_self(CPUState *cpu) 146 { 147 return thread_cpu == cpu; 148 } 149 150 void qemu_cpu_kick(CPUState *cpu) 151 { 152 cpu_exit(cpu); 153 } 154 155 /* Assumes contents are already zeroed. */ 156 void init_task_state(TaskState *ts) 157 { 158 int i; 159 160 ts->used = 1; 161 ts->first_free = ts->sigqueue_table; 162 for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) { 163 ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1]; 164 } 165 ts->sigqueue_table[i].next = NULL; 166 } 167 168 static void 169 adjust_ssize(void) 170 { 171 struct rlimit rl; 172 173 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 174 return; 175 } 176 177 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 178 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 179 180 rl.rlim_max = target_maxssiz; 181 rl.rlim_cur = target_dflssiz; 182 setrlimit(RLIMIT_STACK, &rl); 183 } 184 185 static void save_proc_pathname(char *argv0) 186 { 187 int mib[4]; 188 size_t len; 189 190 mib[0] = CTL_KERN; 191 mib[1] = KERN_PROC; 192 mib[2] = KERN_PROC_PATHNAME; 193 mib[3] = -1; 194 195 len = sizeof(qemu_proc_pathname); 196 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 197 perror("sysctl"); 198 } 199 } 200 201 int main(int argc, char **argv) 202 { 203 const char *filename; 204 const char *cpu_model; 205 const char *cpu_type; 206 const char *log_file = NULL; 207 const char *log_mask = NULL; 208 const char *seed_optarg = NULL; 209 struct target_pt_regs regs1, *regs = ®s1; 210 struct image_info info1, *info = &info1; 211 struct bsd_binprm bprm; 212 TaskState *ts; 213 CPUArchState *env; 214 CPUState *cpu; 215 int optind, rv; 216 const char *r; 217 const char *gdbstub = NULL; 218 char **target_environ, **wrk; 219 envlist_t *envlist = NULL; 220 bsd_type = HOST_DEFAULT_BSD_TYPE; 221 222 adjust_ssize(); 223 224 if (argc <= 1) { 225 usage(); 226 } 227 228 save_proc_pathname(argv[0]); 229 230 error_init(argv[0]); 231 module_call_init(MODULE_INIT_TRACE); 232 qemu_init_cpu_list(); 233 module_call_init(MODULE_INIT_QOM); 234 235 envlist = envlist_create(); 236 237 /* add current environment into the list */ 238 for (wrk = environ; *wrk != NULL; wrk++) { 239 (void) envlist_setenv(envlist, *wrk); 240 } 241 242 cpu_model = NULL; 243 244 qemu_add_opts(&qemu_trace_opts); 245 246 optind = 1; 247 for (;;) { 248 if (optind >= argc) { 249 break; 250 } 251 r = argv[optind]; 252 if (r[0] != '-') { 253 break; 254 } 255 optind++; 256 r++; 257 if (!strcmp(r, "-")) { 258 break; 259 } else if (!strcmp(r, "d")) { 260 if (optind >= argc) { 261 break; 262 } 263 log_mask = argv[optind++]; 264 } else if (!strcmp(r, "D")) { 265 if (optind >= argc) { 266 break; 267 } 268 log_file = argv[optind++]; 269 } else if (!strcmp(r, "E")) { 270 r = argv[optind++]; 271 if (envlist_setenv(envlist, r) != 0) { 272 usage(); 273 } 274 } else if (!strcmp(r, "ignore-environment")) { 275 envlist_free(envlist); 276 envlist = envlist_create(); 277 } else if (!strcmp(r, "U")) { 278 r = argv[optind++]; 279 if (envlist_unsetenv(envlist, r) != 0) { 280 usage(); 281 } 282 } else if (!strcmp(r, "s")) { 283 r = argv[optind++]; 284 rv = qemu_strtoul(r, &r, 0, &target_dflssiz); 285 if (rv < 0 || target_dflssiz <= 0) { 286 usage(); 287 } 288 if (*r == 'M') { 289 target_dflssiz *= 1024 * 1024; 290 } else if (*r == 'k' || *r == 'K') { 291 target_dflssiz *= 1024; 292 } 293 if (target_dflssiz > target_maxssiz) { 294 usage(); 295 } 296 } else if (!strcmp(r, "L")) { 297 interp_prefix = argv[optind++]; 298 } else if (!strcmp(r, "p")) { 299 qemu_host_page_size = atoi(argv[optind++]); 300 if (qemu_host_page_size == 0 || 301 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 302 fprintf(stderr, "page size must be a power of two\n"); 303 exit(1); 304 } 305 } else if (!strcmp(r, "g")) { 306 gdbstub = g_strdup(argv[optind++]); 307 } else if (!strcmp(r, "r")) { 308 qemu_uname_release = argv[optind++]; 309 } else if (!strcmp(r, "cpu")) { 310 cpu_model = argv[optind++]; 311 if (is_help_option(cpu_model)) { 312 /* XXX: implement xxx_cpu_list for targets that still miss it */ 313 #if defined(cpu_list) 314 cpu_list(); 315 #endif 316 exit(1); 317 } 318 } else if (!strcmp(r, "B")) { 319 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 320 if (rv < 0) { 321 usage(); 322 } 323 have_guest_base = true; 324 } else if (!strcmp(r, "drop-ld-preload")) { 325 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 326 } else if (!strcmp(r, "bsd")) { 327 if (!strcasecmp(argv[optind], "freebsd")) { 328 bsd_type = target_freebsd; 329 } else if (!strcasecmp(argv[optind], "netbsd")) { 330 bsd_type = target_netbsd; 331 } else if (!strcasecmp(argv[optind], "openbsd")) { 332 bsd_type = target_openbsd; 333 } else { 334 usage(); 335 } 336 optind++; 337 } else if (!strcmp(r, "seed")) { 338 seed_optarg = optarg; 339 } else if (!strcmp(r, "singlestep")) { 340 singlestep = 1; 341 } else if (!strcmp(r, "strace")) { 342 do_strace = 1; 343 } else if (!strcmp(r, "trace")) { 344 trace_opt_parse(optarg); 345 } else { 346 usage(); 347 } 348 } 349 350 /* init debug */ 351 qemu_log_needs_buffers(); 352 qemu_set_log_filename(log_file, &error_fatal); 353 if (log_mask) { 354 int mask; 355 356 mask = qemu_str_to_log_mask(log_mask); 357 if (!mask) { 358 qemu_print_log_usage(stdout); 359 exit(1); 360 } 361 qemu_set_log(mask); 362 } 363 364 if (optind >= argc) { 365 usage(); 366 } 367 filename = argv[optind]; 368 369 if (!trace_init_backends()) { 370 exit(1); 371 } 372 trace_init_file(); 373 374 /* Zero out regs */ 375 memset(regs, 0, sizeof(struct target_pt_regs)); 376 377 /* Zero bsd params */ 378 memset(&bprm, 0, sizeof(bprm)); 379 380 /* Zero out image_info */ 381 memset(info, 0, sizeof(struct image_info)); 382 383 /* Scan interp_prefix dir for replacement files. */ 384 init_paths(interp_prefix); 385 386 if (cpu_model == NULL) { 387 cpu_model = TARGET_DEFAULT_CPU_MODEL; 388 } 389 390 cpu_type = parse_cpu_option(cpu_model); 391 392 /* init tcg before creating CPUs and to get qemu_host_page_size */ 393 { 394 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 395 396 accel_init_interfaces(ac); 397 ac->init_machine(NULL); 398 } 399 cpu = cpu_create(cpu_type); 400 env = cpu->env_ptr; 401 cpu_reset(cpu); 402 thread_cpu = cpu; 403 404 if (getenv("QEMU_STRACE")) { 405 do_strace = 1; 406 } 407 408 target_environ = envlist_to_environ(envlist, NULL); 409 envlist_free(envlist); 410 411 { 412 Error *err = NULL; 413 if (seed_optarg != NULL) { 414 qemu_guest_random_seed_main(seed_optarg, &err); 415 } else { 416 qcrypto_init(&err); 417 } 418 if (err) { 419 error_reportf_err(err, "cannot initialize crypto: "); 420 exit(1); 421 } 422 } 423 424 /* 425 * Now that page sizes are configured we can do 426 * proper page alignment for guest_base. 427 */ 428 guest_base = HOST_PAGE_ALIGN(guest_base); 429 430 if (loader_exec(filename, argv + optind, target_environ, regs, info, 431 &bprm) != 0) { 432 printf("Error loading %s\n", filename); 433 _exit(1); 434 } 435 436 for (wrk = target_environ; *wrk; wrk++) { 437 g_free(*wrk); 438 } 439 440 g_free(target_environ); 441 442 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 443 qemu_log("guest_base %p\n", (void *)guest_base); 444 log_page_dump("binary load"); 445 446 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); 447 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); 448 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", 449 info->start_code); 450 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", 451 info->start_data); 452 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); 453 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", 454 info->start_stack); 455 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 456 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 457 } 458 459 /* build Task State */ 460 ts = g_new0(TaskState, 1); 461 init_task_state(ts); 462 ts->info = info; 463 ts->bprm = &bprm; 464 cpu->opaque = ts; 465 466 target_set_brk(info->brk); 467 syscall_init(); 468 signal_init(); 469 470 /* 471 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 472 * generating the prologue until now so that the prologue can take 473 * the real value of GUEST_BASE into account. 474 */ 475 tcg_prologue_init(tcg_ctx); 476 477 target_cpu_init(env, regs); 478 479 if (gdbstub) { 480 gdbserver_start(gdbstub); 481 gdb_handlesig(cpu, 0); 482 } 483 cpu_loop(env); 484 /* never exits */ 485 return 0; 486 } 487