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 73 void fork_start(void) 74 { 75 } 76 77 void fork_end(int child) 78 { 79 if (child) { 80 gdbserver_fork(thread_cpu); 81 } 82 } 83 84 void cpu_loop(CPUArchState *env) 85 { 86 target_cpu_loop(env); 87 } 88 89 static void usage(void) 90 { 91 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 92 "\n" QEMU_COPYRIGHT "\n" 93 "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 94 "BSD CPU emulator (compiled for %s emulation)\n" 95 "\n" 96 "Standard options:\n" 97 "-h print this help\n" 98 "-g port wait gdb connection to port\n" 99 "-L path set the elf interpreter prefix (default=%s)\n" 100 "-s size set the stack size in bytes (default=%ld)\n" 101 "-cpu model select CPU (-cpu help for list)\n" 102 "-drop-ld-preload drop LD_PRELOAD for target process\n" 103 "-E var=value sets/modifies targets environment variable(s)\n" 104 "-U var unsets targets environment variable(s)\n" 105 "-B address set guest_base address to address\n" 106 "-bsd type select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n" 107 "\n" 108 "Debug options:\n" 109 "-d item1[,...] enable logging of specified items\n" 110 " (use '-d help' for a list of log items)\n" 111 "-D logfile write logs to 'logfile' (default stderr)\n" 112 "-singlestep always run in singlestep mode\n" 113 "-strace log system calls\n" 114 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 115 " specify tracing options\n" 116 "\n" 117 "Environment variables:\n" 118 "QEMU_STRACE Print system calls and arguments similar to the\n" 119 " 'strace' program. Enable by setting to any value.\n" 120 "You can use -E and -U options to set/unset environment variables\n" 121 "for target process. It is possible to provide several variables\n" 122 "by repeating the option. For example:\n" 123 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 124 "Note that if you provide several changes to single variable\n" 125 "last change will stay in effect.\n" 126 "\n" 127 QEMU_HELP_BOTTOM "\n" 128 , 129 TARGET_NAME, 130 interp_prefix, 131 target_dflssiz); 132 exit(1); 133 } 134 135 __thread CPUState *thread_cpu; 136 137 bool qemu_cpu_is_self(CPUState *cpu) 138 { 139 return thread_cpu == cpu; 140 } 141 142 void qemu_cpu_kick(CPUState *cpu) 143 { 144 cpu_exit(cpu); 145 } 146 147 /* Assumes contents are already zeroed. */ 148 void init_task_state(TaskState *ts) 149 { 150 int i; 151 152 ts->used = 1; 153 ts->first_free = ts->sigqueue_table; 154 for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) { 155 ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1]; 156 } 157 ts->sigqueue_table[i].next = NULL; 158 } 159 160 void gemu_log(const char *fmt, ...) 161 { 162 va_list ap; 163 164 va_start(ap, fmt); 165 vfprintf(stderr, fmt, ap); 166 va_end(ap); 167 } 168 169 static void 170 adjust_ssize(void) 171 { 172 struct rlimit rl; 173 174 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 175 return; 176 } 177 178 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 179 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 180 181 rl.rlim_max = target_maxssiz; 182 rl.rlim_cur = target_dflssiz; 183 setrlimit(RLIMIT_STACK, &rl); 184 } 185 186 static void save_proc_pathname(char *argv0) 187 { 188 int mib[4]; 189 size_t len; 190 191 mib[0] = CTL_KERN; 192 mib[1] = KERN_PROC; 193 mib[2] = KERN_PROC_PATHNAME; 194 mib[3] = -1; 195 196 len = sizeof(qemu_proc_pathname); 197 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 198 perror("sysctl"); 199 } 200 } 201 202 int main(int argc, char **argv) 203 { 204 const char *filename; 205 const char *cpu_model; 206 const char *cpu_type; 207 const char *log_file = NULL; 208 const char *log_mask = NULL; 209 const char *seed_optarg = NULL; 210 struct target_pt_regs regs1, *regs = ®s1; 211 struct image_info info1, *info = &info1; 212 struct bsd_binprm bprm; 213 TaskState *ts; 214 CPUArchState *env; 215 CPUState *cpu; 216 int optind, rv; 217 const char *r; 218 const char *gdbstub = NULL; 219 char **target_environ, **wrk; 220 envlist_t *envlist = NULL; 221 bsd_type = HOST_DEFAULT_BSD_TYPE; 222 223 adjust_ssize(); 224 225 if (argc <= 1) { 226 usage(); 227 } 228 229 save_proc_pathname(argv[0]); 230 231 error_init(argv[0]); 232 module_call_init(MODULE_INIT_TRACE); 233 qemu_init_cpu_list(); 234 module_call_init(MODULE_INIT_QOM); 235 236 envlist = envlist_create(); 237 238 /* add current environment into the list */ 239 for (wrk = environ; *wrk != NULL; wrk++) { 240 (void) envlist_setenv(envlist, *wrk); 241 } 242 243 cpu_model = NULL; 244 245 qemu_add_opts(&qemu_trace_opts); 246 247 optind = 1; 248 for (;;) { 249 if (optind >= argc) { 250 break; 251 } 252 r = argv[optind]; 253 if (r[0] != '-') { 254 break; 255 } 256 optind++; 257 r++; 258 if (!strcmp(r, "-")) { 259 break; 260 } else if (!strcmp(r, "d")) { 261 if (optind >= argc) { 262 break; 263 } 264 log_mask = argv[optind++]; 265 } else if (!strcmp(r, "D")) { 266 if (optind >= argc) { 267 break; 268 } 269 log_file = argv[optind++]; 270 } else if (!strcmp(r, "E")) { 271 r = argv[optind++]; 272 if (envlist_setenv(envlist, r) != 0) { 273 usage(); 274 } 275 } else if (!strcmp(r, "ignore-environment")) { 276 envlist_free(envlist); 277 envlist = envlist_create(); 278 } else if (!strcmp(r, "U")) { 279 r = argv[optind++]; 280 if (envlist_unsetenv(envlist, r) != 0) { 281 usage(); 282 } 283 } else if (!strcmp(r, "s")) { 284 r = argv[optind++]; 285 rv = qemu_strtoul(r, &r, 0, &target_dflssiz); 286 if (rv < 0 || target_dflssiz <= 0) { 287 usage(); 288 } 289 if (*r == 'M') { 290 target_dflssiz *= 1024 * 1024; 291 } else if (*r == 'k' || *r == 'K') { 292 target_dflssiz *= 1024; 293 } 294 if (target_dflssiz > target_maxssiz) { 295 usage(); 296 } 297 } else if (!strcmp(r, "L")) { 298 interp_prefix = argv[optind++]; 299 } else if (!strcmp(r, "p")) { 300 qemu_host_page_size = atoi(argv[optind++]); 301 if (qemu_host_page_size == 0 || 302 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 303 fprintf(stderr, "page size must be a power of two\n"); 304 exit(1); 305 } 306 } else if (!strcmp(r, "g")) { 307 gdbstub = g_strdup(argv[optind++]); 308 } else if (!strcmp(r, "r")) { 309 qemu_uname_release = argv[optind++]; 310 } else if (!strcmp(r, "cpu")) { 311 cpu_model = argv[optind++]; 312 if (is_help_option(cpu_model)) { 313 /* XXX: implement xxx_cpu_list for targets that still miss it */ 314 #if defined(cpu_list) 315 cpu_list(); 316 #endif 317 exit(1); 318 } 319 } else if (!strcmp(r, "B")) { 320 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 321 if (rv < 0) { 322 usage(); 323 } 324 have_guest_base = true; 325 } else if (!strcmp(r, "drop-ld-preload")) { 326 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 327 } else if (!strcmp(r, "bsd")) { 328 if (!strcasecmp(argv[optind], "freebsd")) { 329 bsd_type = target_freebsd; 330 } else if (!strcasecmp(argv[optind], "netbsd")) { 331 bsd_type = target_netbsd; 332 } else if (!strcasecmp(argv[optind], "openbsd")) { 333 bsd_type = target_openbsd; 334 } else { 335 usage(); 336 } 337 optind++; 338 } else if (!strcmp(r, "seed")) { 339 seed_optarg = optarg; 340 } else if (!strcmp(r, "singlestep")) { 341 singlestep = 1; 342 } else if (!strcmp(r, "strace")) { 343 do_strace = 1; 344 } else if (!strcmp(r, "trace")) { 345 trace_opt_parse(optarg); 346 } else { 347 usage(); 348 } 349 } 350 351 /* init debug */ 352 qemu_log_needs_buffers(); 353 qemu_set_log_filename(log_file, &error_fatal); 354 if (log_mask) { 355 int mask; 356 357 mask = qemu_str_to_log_mask(log_mask); 358 if (!mask) { 359 qemu_print_log_usage(stdout); 360 exit(1); 361 } 362 qemu_set_log(mask); 363 } 364 365 if (optind >= argc) { 366 usage(); 367 } 368 filename = argv[optind]; 369 370 if (!trace_init_backends()) { 371 exit(1); 372 } 373 trace_init_file(); 374 375 /* Zero out regs */ 376 memset(regs, 0, sizeof(struct target_pt_regs)); 377 378 /* Zero bsd params */ 379 memset(&bprm, 0, sizeof(bprm)); 380 381 /* Zero out image_info */ 382 memset(info, 0, sizeof(struct image_info)); 383 384 /* Scan interp_prefix dir for replacement files. */ 385 init_paths(interp_prefix); 386 387 if (cpu_model == NULL) { 388 cpu_model = TARGET_DEFAULT_CPU_MODEL; 389 } 390 391 cpu_type = parse_cpu_option(cpu_model); 392 393 /* init tcg before creating CPUs and to get qemu_host_page_size */ 394 { 395 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 396 397 accel_init_interfaces(ac); 398 ac->init_machine(NULL); 399 } 400 cpu = cpu_create(cpu_type); 401 env = cpu->env_ptr; 402 cpu_reset(cpu); 403 thread_cpu = cpu; 404 405 if (getenv("QEMU_STRACE")) { 406 do_strace = 1; 407 } 408 409 target_environ = envlist_to_environ(envlist, NULL); 410 envlist_free(envlist); 411 412 { 413 Error *err = NULL; 414 if (seed_optarg != NULL) { 415 qemu_guest_random_seed_main(seed_optarg, &err); 416 } else { 417 qcrypto_init(&err); 418 } 419 if (err) { 420 error_reportf_err(err, "cannot initialize crypto: "); 421 exit(1); 422 } 423 } 424 425 /* 426 * Now that page sizes are configured we can do 427 * proper page alignment for guest_base. 428 */ 429 guest_base = HOST_PAGE_ALIGN(guest_base); 430 431 if (loader_exec(filename, argv + optind, target_environ, regs, info, 432 &bprm) != 0) { 433 printf("Error loading %s\n", filename); 434 _exit(1); 435 } 436 437 for (wrk = target_environ; *wrk; wrk++) { 438 g_free(*wrk); 439 } 440 441 g_free(target_environ); 442 443 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 444 qemu_log("guest_base %p\n", (void *)guest_base); 445 log_page_dump("binary load"); 446 447 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); 448 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); 449 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", 450 info->start_code); 451 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", 452 info->start_data); 453 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); 454 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", 455 info->start_stack); 456 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 457 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 458 } 459 460 /* build Task State */ 461 ts = g_new0(TaskState, 1); 462 init_task_state(ts); 463 ts->info = info; 464 ts->bprm = &bprm; 465 cpu->opaque = ts; 466 467 target_set_brk(info->brk); 468 syscall_init(); 469 signal_init(); 470 471 /* 472 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 473 * generating the prologue until now so that the prologue can take 474 * the real value of GUEST_BASE into account. 475 */ 476 tcg_prologue_init(tcg_ctx); 477 478 target_cpu_init(env, regs); 479 480 if (gdbstub) { 481 gdbserver_start(gdbstub); 482 gdb_handlesig(cpu, 0); 483 } 484 cpu_loop(env); 485 /* never exits */ 486 return 0; 487 } 488