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 uintptr_t guest_base; 56 bool have_guest_base; 57 /* 58 * When running 32-on-64 we should make sure we can fit all of the possible 59 * guest address space into a contiguous chunk of virtual host memory. 60 * 61 * This way we will never overlap with our own libraries or binaries or stack 62 * or anything else that QEMU maps. 63 * 64 * Many cpus reserve the high bit (or more than one for some 64-bit cpus) 65 * of the address for the kernel. Some cpus rely on this and user space 66 * uses the high bit(s) for pointer tagging and the like. For them, we 67 * must preserve the expected address space. 68 */ 69 #ifndef MAX_RESERVED_VA 70 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS 71 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ 72 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) 73 /* 74 * There are a number of places where we assign reserved_va to a variable 75 * of type abi_ulong and expect it to fit. Avoid the last page. 76 */ 77 # define MAX_RESERVED_VA (0xfffffffful & TARGET_PAGE_MASK) 78 # else 79 # define MAX_RESERVED_VA (1ul << TARGET_VIRT_ADDR_SPACE_BITS) 80 # endif 81 # else 82 # define MAX_RESERVED_VA 0 83 # endif 84 #endif 85 86 /* 87 * That said, reserving *too* much vm space via mmap can run into problems 88 * with rlimits, oom due to page table creation, etc. We will still try it, 89 * if directed by the command-line option, but not by default. 90 */ 91 #if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32 92 unsigned long reserved_va = MAX_RESERVED_VA; 93 #else 94 unsigned long reserved_va; 95 #endif 96 97 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; 98 const char *qemu_uname_release; 99 enum BSDType bsd_type; 100 char qemu_proc_pathname[PATH_MAX]; /* full path to exeutable */ 101 102 unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */ 103 unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */ 104 unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */ 105 unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */ 106 unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */ 107 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */ 108 109 /* Helper routines for implementing atomic operations. */ 110 111 void fork_start(void) 112 { 113 start_exclusive(); 114 cpu_list_lock(); 115 mmap_fork_start(); 116 } 117 118 void fork_end(int child) 119 { 120 if (child) { 121 CPUState *cpu, *next_cpu; 122 /* 123 * Child processes created by fork() only have a single thread. Discard 124 * information about the parent threads. 125 */ 126 CPU_FOREACH_SAFE(cpu, next_cpu) { 127 if (cpu != thread_cpu) { 128 QTAILQ_REMOVE_RCU(&cpus, cpu, node); 129 } 130 } 131 mmap_fork_end(child); 132 /* 133 * qemu_init_cpu_list() takes care of reinitializing the exclusive 134 * state, so we don't need to end_exclusive() here. 135 */ 136 qemu_init_cpu_list(); 137 gdbserver_fork(thread_cpu); 138 } else { 139 mmap_fork_end(child); 140 cpu_list_unlock(); 141 end_exclusive(); 142 } 143 } 144 145 void cpu_loop(CPUArchState *env) 146 { 147 target_cpu_loop(env); 148 } 149 150 static void usage(void) 151 { 152 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 153 "\n" QEMU_COPYRIGHT "\n" 154 "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 155 "BSD CPU emulator (compiled for %s emulation)\n" 156 "\n" 157 "Standard options:\n" 158 "-h print this help\n" 159 "-g port wait gdb connection to port\n" 160 "-L path set the elf interpreter prefix (default=%s)\n" 161 "-s size set the stack size in bytes (default=%ld)\n" 162 "-cpu model select CPU (-cpu help for list)\n" 163 "-drop-ld-preload drop LD_PRELOAD for target process\n" 164 "-E var=value sets/modifies targets environment variable(s)\n" 165 "-U var unsets targets environment variable(s)\n" 166 "-B address set guest_base address to address\n" 167 "-bsd type select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n" 168 "\n" 169 "Debug options:\n" 170 "-d item1[,...] enable logging of specified items\n" 171 " (use '-d help' for a list of log items)\n" 172 "-D logfile write logs to 'logfile' (default stderr)\n" 173 "-singlestep always run in singlestep mode\n" 174 "-strace log system calls\n" 175 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 176 " specify tracing options\n" 177 "\n" 178 "Environment variables:\n" 179 "QEMU_STRACE Print system calls and arguments similar to the\n" 180 " 'strace' program. Enable by setting to any value.\n" 181 "You can use -E and -U options to set/unset environment variables\n" 182 "for target process. It is possible to provide several variables\n" 183 "by repeating the option. For example:\n" 184 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 185 "Note that if you provide several changes to single variable\n" 186 "last change will stay in effect.\n" 187 "\n" 188 QEMU_HELP_BOTTOM "\n" 189 , 190 TARGET_NAME, 191 interp_prefix, 192 target_dflssiz); 193 exit(1); 194 } 195 196 __thread CPUState *thread_cpu; 197 198 void stop_all_tasks(void) 199 { 200 /* 201 * We trust when using NPTL (pthreads) start_exclusive() handles thread 202 * stopping correctly. 203 */ 204 start_exclusive(); 205 } 206 207 bool qemu_cpu_is_self(CPUState *cpu) 208 { 209 return thread_cpu == cpu; 210 } 211 212 void qemu_cpu_kick(CPUState *cpu) 213 { 214 cpu_exit(cpu); 215 } 216 217 /* Assumes contents are already zeroed. */ 218 static void init_task_state(TaskState *ts) 219 { 220 } 221 222 void gemu_log(const char *fmt, ...) 223 { 224 va_list ap; 225 226 va_start(ap, fmt); 227 vfprintf(stderr, fmt, ap); 228 va_end(ap); 229 } 230 231 static void 232 adjust_ssize(void) 233 { 234 struct rlimit rl; 235 236 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 237 return; 238 } 239 240 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 241 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 242 243 rl.rlim_max = target_maxssiz; 244 rl.rlim_cur = target_dflssiz; 245 setrlimit(RLIMIT_STACK, &rl); 246 } 247 248 static void save_proc_pathname(char *argv0) 249 { 250 int mib[4]; 251 size_t len; 252 253 mib[0] = CTL_KERN; 254 mib[1] = KERN_PROC; 255 mib[2] = KERN_PROC_PATHNAME; 256 mib[3] = -1; 257 258 len = sizeof(qemu_proc_pathname); 259 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 260 perror("sysctl"); 261 } 262 } 263 264 int main(int argc, char **argv) 265 { 266 const char *filename; 267 const char *cpu_model; 268 const char *cpu_type; 269 const char *log_file = NULL; 270 const char *log_mask = NULL; 271 const char *seed_optarg = NULL; 272 struct target_pt_regs regs1, *regs = ®s1; 273 struct image_info info1, *info = &info1; 274 struct bsd_binprm bprm; 275 TaskState *ts; 276 CPUArchState *env; 277 CPUState *cpu; 278 int optind, rv; 279 const char *r; 280 const char *gdbstub = NULL; 281 char **target_environ, **wrk; 282 envlist_t *envlist = NULL; 283 bsd_type = HOST_DEFAULT_BSD_TYPE; 284 char *argv0 = NULL; 285 286 adjust_ssize(); 287 288 if (argc <= 1) { 289 usage(); 290 } 291 292 save_proc_pathname(argv[0]); 293 294 error_init(argv[0]); 295 module_call_init(MODULE_INIT_TRACE); 296 qemu_init_cpu_list(); 297 module_call_init(MODULE_INIT_QOM); 298 299 envlist = envlist_create(); 300 301 /* add current environment into the list */ 302 for (wrk = environ; *wrk != NULL; wrk++) { 303 (void) envlist_setenv(envlist, *wrk); 304 } 305 306 cpu_model = NULL; 307 308 qemu_add_opts(&qemu_trace_opts); 309 310 optind = 1; 311 for (;;) { 312 if (optind >= argc) { 313 break; 314 } 315 r = argv[optind]; 316 if (r[0] != '-') { 317 break; 318 } 319 optind++; 320 r++; 321 if (!strcmp(r, "-")) { 322 break; 323 } else if (!strcmp(r, "d")) { 324 if (optind >= argc) { 325 break; 326 } 327 log_mask = argv[optind++]; 328 } else if (!strcmp(r, "D")) { 329 if (optind >= argc) { 330 break; 331 } 332 log_file = argv[optind++]; 333 } else if (!strcmp(r, "E")) { 334 r = argv[optind++]; 335 if (envlist_setenv(envlist, r) != 0) { 336 usage(); 337 } 338 } else if (!strcmp(r, "ignore-environment")) { 339 envlist_free(envlist); 340 envlist = envlist_create(); 341 } else if (!strcmp(r, "U")) { 342 r = argv[optind++]; 343 if (envlist_unsetenv(envlist, r) != 0) { 344 usage(); 345 } 346 } else if (!strcmp(r, "s")) { 347 r = argv[optind++]; 348 rv = qemu_strtoul(r, &r, 0, &target_dflssiz); 349 if (rv < 0 || target_dflssiz <= 0) { 350 usage(); 351 } 352 if (*r == 'M') { 353 target_dflssiz *= 1024 * 1024; 354 } else if (*r == 'k' || *r == 'K') { 355 target_dflssiz *= 1024; 356 } 357 if (target_dflssiz > target_maxssiz) { 358 usage(); 359 } 360 } else if (!strcmp(r, "L")) { 361 interp_prefix = argv[optind++]; 362 } else if (!strcmp(r, "p")) { 363 qemu_host_page_size = atoi(argv[optind++]); 364 if (qemu_host_page_size == 0 || 365 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 366 fprintf(stderr, "page size must be a power of two\n"); 367 exit(1); 368 } 369 } else if (!strcmp(r, "g")) { 370 gdbstub = g_strdup(argv[optind++]); 371 } else if (!strcmp(r, "r")) { 372 qemu_uname_release = argv[optind++]; 373 } else if (!strcmp(r, "cpu")) { 374 cpu_model = argv[optind++]; 375 if (is_help_option(cpu_model)) { 376 /* XXX: implement xxx_cpu_list for targets that still miss it */ 377 #if defined(cpu_list) 378 cpu_list(); 379 #endif 380 exit(1); 381 } 382 } else if (!strcmp(r, "B")) { 383 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 384 if (rv < 0) { 385 usage(); 386 } 387 have_guest_base = true; 388 } else if (!strcmp(r, "drop-ld-preload")) { 389 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 390 } else if (!strcmp(r, "bsd")) { 391 if (!strcasecmp(argv[optind], "freebsd")) { 392 bsd_type = target_freebsd; 393 } else if (!strcasecmp(argv[optind], "netbsd")) { 394 bsd_type = target_netbsd; 395 } else if (!strcasecmp(argv[optind], "openbsd")) { 396 bsd_type = target_openbsd; 397 } else { 398 usage(); 399 } 400 optind++; 401 } else if (!strcmp(r, "seed")) { 402 seed_optarg = optarg; 403 } else if (!strcmp(r, "singlestep")) { 404 singlestep = 1; 405 } else if (!strcmp(r, "strace")) { 406 do_strace = 1; 407 } else if (!strcmp(r, "trace")) { 408 trace_opt_parse(optarg); 409 } else if (!strcmp(r, "0")) { 410 argv0 = argv[optind++]; 411 } else { 412 usage(); 413 } 414 } 415 416 /* init debug */ 417 qemu_log_needs_buffers(); 418 qemu_set_log_filename(log_file, &error_fatal); 419 if (log_mask) { 420 int mask; 421 422 mask = qemu_str_to_log_mask(log_mask); 423 if (!mask) { 424 qemu_print_log_usage(stdout); 425 exit(1); 426 } 427 qemu_set_log(mask); 428 } 429 430 if (optind >= argc) { 431 usage(); 432 } 433 filename = argv[optind]; 434 if (argv0) { 435 argv[optind] = argv0; 436 } 437 438 if (!trace_init_backends()) { 439 exit(1); 440 } 441 trace_init_file(); 442 443 /* Zero out regs */ 444 memset(regs, 0, sizeof(struct target_pt_regs)); 445 446 /* Zero bsd params */ 447 memset(&bprm, 0, sizeof(bprm)); 448 449 /* Zero out image_info */ 450 memset(info, 0, sizeof(struct image_info)); 451 452 /* Scan interp_prefix dir for replacement files. */ 453 init_paths(interp_prefix); 454 455 if (cpu_model == NULL) { 456 cpu_model = TARGET_DEFAULT_CPU_MODEL; 457 } 458 459 cpu_type = parse_cpu_option(cpu_model); 460 461 /* init tcg before creating CPUs and to get qemu_host_page_size */ 462 { 463 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 464 465 accel_init_interfaces(ac); 466 ac->init_machine(NULL); 467 } 468 cpu = cpu_create(cpu_type); 469 env = cpu->env_ptr; 470 cpu_reset(cpu); 471 thread_cpu = cpu; 472 473 if (getenv("QEMU_STRACE")) { 474 do_strace = 1; 475 } 476 477 target_environ = envlist_to_environ(envlist, NULL); 478 envlist_free(envlist); 479 480 if (reserved_va) { 481 mmap_next_start = reserved_va; 482 } 483 484 { 485 Error *err = NULL; 486 if (seed_optarg != NULL) { 487 qemu_guest_random_seed_main(seed_optarg, &err); 488 } else { 489 qcrypto_init(&err); 490 } 491 if (err) { 492 error_reportf_err(err, "cannot initialize crypto: "); 493 exit(1); 494 } 495 } 496 497 /* 498 * Now that page sizes are configured we can do 499 * proper page alignment for guest_base. 500 */ 501 guest_base = HOST_PAGE_ALIGN(guest_base); 502 503 if (loader_exec(filename, argv + optind, target_environ, regs, info, 504 &bprm) != 0) { 505 printf("Error loading %s\n", filename); 506 _exit(1); 507 } 508 509 for (wrk = target_environ; *wrk; wrk++) { 510 g_free(*wrk); 511 } 512 513 g_free(target_environ); 514 515 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 516 qemu_log("guest_base %p\n", (void *)guest_base); 517 log_page_dump("binary load"); 518 519 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); 520 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); 521 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", 522 info->start_code); 523 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", 524 info->start_data); 525 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); 526 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", 527 info->start_stack); 528 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 529 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 530 } 531 532 /* build Task State */ 533 ts = g_new0(TaskState, 1); 534 init_task_state(ts); 535 ts->info = info; 536 ts->bprm = &bprm; 537 cpu->opaque = ts; 538 539 target_set_brk(info->brk); 540 syscall_init(); 541 signal_init(); 542 543 /* 544 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 545 * generating the prologue until now so that the prologue can take 546 * the real value of GUEST_BASE into account. 547 */ 548 tcg_prologue_init(tcg_ctx); 549 550 target_cpu_init(env, regs); 551 552 if (gdbstub) { 553 gdbserver_start(gdbstub); 554 gdb_handlesig(cpu, 0); 555 } 556 cpu_loop(env); 557 /* never exits */ 558 return 0; 559 } 560