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 "qemu/osdep.h" 22 #include <sys/resource.h> 23 #include <sys/sysctl.h> 24 25 #include "qemu/help-texts.h" 26 #include "qemu/units.h" 27 #include "qemu/accel.h" 28 #include "qemu-version.h" 29 #include <machine/trap.h> 30 31 #include "qapi/error.h" 32 #include "qemu.h" 33 #include "qemu/config-file.h" 34 #include "qemu/error-report.h" 35 #include "qemu/path.h" 36 #include "qemu/help_option.h" 37 #include "qemu/module.h" 38 #include "exec/exec-all.h" 39 #include "tcg/startup.h" 40 #include "qemu/timer.h" 41 #include "qemu/envlist.h" 42 #include "qemu/cutils.h" 43 #include "exec/log.h" 44 #include "trace/control.h" 45 #include "crypto/init.h" 46 #include "qemu/guest-random.h" 47 #include "gdbstub/user.h" 48 49 #include "host-os.h" 50 #include "target_arch_cpu.h" 51 52 static bool opt_one_insn_per_tb; 53 uintptr_t guest_base; 54 bool have_guest_base; 55 /* 56 * When running 32-on-64 we should make sure we can fit all of the possible 57 * guest address space into a contiguous chunk of virtual host memory. 58 * 59 * This way we will never overlap with our own libraries or binaries or stack 60 * or anything else that QEMU maps. 61 * 62 * Many cpus reserve the high bit (or more than one for some 64-bit cpus) 63 * of the address for the kernel. Some cpus rely on this and user space 64 * uses the high bit(s) for pointer tagging and the like. For them, we 65 * must preserve the expected address space. 66 */ 67 #ifndef MAX_RESERVED_VA 68 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS 69 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ 70 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) 71 # define MAX_RESERVED_VA 0xfffffffful 72 # else 73 # define MAX_RESERVED_VA ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1) 74 # endif 75 # else 76 # define MAX_RESERVED_VA 0 77 # endif 78 #endif 79 80 /* 81 * That said, reserving *too* much vm space via mmap can run into problems 82 * with rlimits, oom due to page table creation, etc. We will still try it, 83 * if directed by the command-line option, but not by default. 84 */ 85 #if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32 86 unsigned long reserved_va = MAX_RESERVED_VA; 87 #else 88 unsigned long reserved_va; 89 #endif 90 91 const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; 92 const char *qemu_uname_release; 93 char qemu_proc_pathname[PATH_MAX]; /* full path to exeutable */ 94 95 unsigned long target_maxtsiz = TARGET_MAXTSIZ; /* max text size */ 96 unsigned long target_dfldsiz = TARGET_DFLDSIZ; /* initial data size limit */ 97 unsigned long target_maxdsiz = TARGET_MAXDSIZ; /* max data size */ 98 unsigned long target_dflssiz = TARGET_DFLSSIZ; /* initial data size limit */ 99 unsigned long target_maxssiz = TARGET_MAXSSIZ; /* max stack size */ 100 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */ 101 102 /* Helper routines for implementing atomic operations. */ 103 104 void fork_start(void) 105 { 106 start_exclusive(); 107 cpu_list_lock(); 108 mmap_fork_start(); 109 } 110 111 void fork_end(int child) 112 { 113 if (child) { 114 CPUState *cpu, *next_cpu; 115 /* 116 * Child processes created by fork() only have a single thread. Discard 117 * information about the parent threads. 118 */ 119 CPU_FOREACH_SAFE(cpu, next_cpu) { 120 if (cpu != thread_cpu) { 121 QTAILQ_REMOVE_RCU(&cpus_queue, cpu, node); 122 } 123 } 124 mmap_fork_end(child); 125 /* 126 * qemu_init_cpu_list() takes care of reinitializing the exclusive 127 * state, so we don't need to end_exclusive() here. 128 */ 129 qemu_init_cpu_list(); 130 gdbserver_fork(thread_cpu); 131 } else { 132 mmap_fork_end(child); 133 cpu_list_unlock(); 134 end_exclusive(); 135 } 136 } 137 138 void cpu_loop(CPUArchState *env) 139 { 140 target_cpu_loop(env); 141 } 142 143 static void usage(void) 144 { 145 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 146 "\n" QEMU_COPYRIGHT "\n" 147 "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 148 "BSD CPU emulator (compiled for %s emulation)\n" 149 "\n" 150 "Standard options:\n" 151 "-h print this help\n" 152 "-g port wait gdb connection to port\n" 153 "-L path set the elf interpreter prefix (default=%s)\n" 154 "-s size set the stack size in bytes (default=%ld)\n" 155 "-cpu model select CPU (-cpu help for list)\n" 156 "-drop-ld-preload drop LD_PRELOAD for target process\n" 157 "-E var=value sets/modifies targets environment variable(s)\n" 158 "-U var unsets targets environment variable(s)\n" 159 "-B address set guest_base address to address\n" 160 "\n" 161 "Debug options:\n" 162 "-d item1[,...] enable logging of specified items\n" 163 " (use '-d help' for a list of log items)\n" 164 "-D logfile write logs to 'logfile' (default stderr)\n" 165 "-one-insn-per-tb run with one guest instruction per emulated TB\n" 166 "-strace log system calls\n" 167 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 168 " specify tracing options\n" 169 "\n" 170 "Environment variables:\n" 171 "QEMU_STRACE Print system calls and arguments similar to the\n" 172 " 'strace' program. Enable by setting to any value.\n" 173 "You can use -E and -U options to set/unset environment variables\n" 174 "for target process. It is possible to provide several variables\n" 175 "by repeating the option. For example:\n" 176 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 177 "Note that if you provide several changes to single variable\n" 178 "last change will stay in effect.\n" 179 "\n" 180 QEMU_HELP_BOTTOM "\n" 181 , 182 TARGET_NAME, 183 interp_prefix, 184 target_dflssiz); 185 exit(1); 186 } 187 188 __thread CPUState *thread_cpu; 189 190 void stop_all_tasks(void) 191 { 192 /* 193 * We trust when using NPTL (pthreads) start_exclusive() handles thread 194 * stopping correctly. 195 */ 196 start_exclusive(); 197 } 198 199 bool qemu_cpu_is_self(CPUState *cpu) 200 { 201 return thread_cpu == cpu; 202 } 203 204 void qemu_cpu_kick(CPUState *cpu) 205 { 206 cpu_exit(cpu); 207 } 208 209 /* Assumes contents are already zeroed. */ 210 static void init_task_state(TaskState *ts) 211 { 212 ts->sigaltstack_used = (struct target_sigaltstack) { 213 .ss_sp = 0, 214 .ss_size = 0, 215 .ss_flags = TARGET_SS_DISABLE, 216 }; 217 } 218 219 void gemu_log(const char *fmt, ...) 220 { 221 va_list ap; 222 223 va_start(ap, fmt); 224 vfprintf(stderr, fmt, ap); 225 va_end(ap); 226 } 227 228 static void 229 adjust_ssize(void) 230 { 231 struct rlimit rl; 232 233 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 234 return; 235 } 236 237 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 238 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 239 240 rl.rlim_max = target_maxssiz; 241 rl.rlim_cur = target_dflssiz; 242 setrlimit(RLIMIT_STACK, &rl); 243 } 244 245 static void save_proc_pathname(char *argv0) 246 { 247 int mib[4]; 248 size_t len; 249 250 mib[0] = CTL_KERN; 251 mib[1] = KERN_PROC; 252 mib[2] = KERN_PROC_PATHNAME; 253 mib[3] = -1; 254 255 len = sizeof(qemu_proc_pathname); 256 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 257 perror("sysctl"); 258 } 259 } 260 261 int main(int argc, char **argv) 262 { 263 const char *filename; 264 const char *cpu_model; 265 const char *cpu_type; 266 const char *log_file = NULL; 267 const char *log_mask = NULL; 268 const char *seed_optarg = NULL; 269 struct target_pt_regs regs1, *regs = ®s1; 270 struct image_info info1, *info = &info1; 271 struct bsd_binprm bprm; 272 TaskState *ts; 273 CPUArchState *env; 274 CPUState *cpu; 275 int optind, rv; 276 const char *r; 277 const char *gdbstub = NULL; 278 char **target_environ, **wrk; 279 envlist_t *envlist = NULL; 280 char *argv0 = NULL; 281 282 adjust_ssize(); 283 284 if (argc <= 1) { 285 usage(); 286 } 287 288 save_proc_pathname(argv[0]); 289 290 error_init(argv[0]); 291 module_call_init(MODULE_INIT_TRACE); 292 qemu_init_cpu_list(); 293 module_call_init(MODULE_INIT_QOM); 294 295 envlist = envlist_create(); 296 297 /* 298 * add current environment into the list 299 * envlist_setenv adds to the front of the list; to preserve environ 300 * order add from back to front 301 */ 302 for (wrk = environ; *wrk != NULL; wrk++) { 303 continue; 304 } 305 while (wrk != environ) { 306 wrk--; 307 (void) envlist_setenv(envlist, *wrk); 308 } 309 310 cpu_model = NULL; 311 312 qemu_add_opts(&qemu_trace_opts); 313 314 optind = 1; 315 for (;;) { 316 if (optind >= argc) { 317 break; 318 } 319 r = argv[optind]; 320 if (r[0] != '-') { 321 break; 322 } 323 optind++; 324 r++; 325 if (!strcmp(r, "-")) { 326 break; 327 } else if (!strcmp(r, "d")) { 328 if (optind >= argc) { 329 break; 330 } 331 log_mask = argv[optind++]; 332 } else if (!strcmp(r, "D")) { 333 if (optind >= argc) { 334 break; 335 } 336 log_file = argv[optind++]; 337 } else if (!strcmp(r, "E")) { 338 r = argv[optind++]; 339 if (envlist_setenv(envlist, r) != 0) { 340 usage(); 341 } 342 } else if (!strcmp(r, "ignore-environment")) { 343 envlist_free(envlist); 344 envlist = envlist_create(); 345 } else if (!strcmp(r, "U")) { 346 r = argv[optind++]; 347 if (envlist_unsetenv(envlist, r) != 0) { 348 usage(); 349 } 350 } else if (!strcmp(r, "s")) { 351 r = argv[optind++]; 352 rv = qemu_strtoul(r, &r, 0, &target_dflssiz); 353 if (rv < 0 || target_dflssiz <= 0) { 354 usage(); 355 } 356 if (*r == 'M') { 357 target_dflssiz *= 1024 * 1024; 358 } else if (*r == 'k' || *r == 'K') { 359 target_dflssiz *= 1024; 360 } 361 if (target_dflssiz > target_maxssiz) { 362 usage(); 363 } 364 } else if (!strcmp(r, "L")) { 365 interp_prefix = argv[optind++]; 366 } else if (!strcmp(r, "p")) { 367 qemu_host_page_size = atoi(argv[optind++]); 368 if (qemu_host_page_size == 0 || 369 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 370 fprintf(stderr, "page size must be a power of two\n"); 371 exit(1); 372 } 373 } else if (!strcmp(r, "g")) { 374 gdbstub = g_strdup(argv[optind++]); 375 } else if (!strcmp(r, "r")) { 376 qemu_uname_release = argv[optind++]; 377 } else if (!strcmp(r, "cpu")) { 378 cpu_model = argv[optind++]; 379 if (is_help_option(cpu_model)) { 380 list_cpus(); 381 exit(1); 382 } 383 } else if (!strcmp(r, "B")) { 384 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 385 if (rv < 0) { 386 usage(); 387 } 388 have_guest_base = true; 389 } else if (!strcmp(r, "drop-ld-preload")) { 390 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 391 } else if (!strcmp(r, "seed")) { 392 seed_optarg = optarg; 393 } else if (!strcmp(r, "one-insn-per-tb")) { 394 opt_one_insn_per_tb = true; 395 } else if (!strcmp(r, "strace")) { 396 do_strace = 1; 397 } else if (!strcmp(r, "trace")) { 398 trace_opt_parse(optarg); 399 } else if (!strcmp(r, "0")) { 400 argv0 = argv[optind++]; 401 } else { 402 usage(); 403 } 404 } 405 406 /* init debug */ 407 { 408 int mask = 0; 409 if (log_mask) { 410 mask = qemu_str_to_log_mask(log_mask); 411 if (!mask) { 412 qemu_print_log_usage(stdout); 413 exit(1); 414 } 415 } 416 qemu_set_log_filename_flags(log_file, mask, &error_fatal); 417 } 418 419 if (optind >= argc) { 420 usage(); 421 } 422 filename = argv[optind]; 423 if (argv0) { 424 argv[optind] = argv0; 425 } 426 427 if (!trace_init_backends()) { 428 exit(1); 429 } 430 trace_init_file(); 431 432 /* Zero out regs */ 433 memset(regs, 0, sizeof(struct target_pt_regs)); 434 435 /* Zero bsd params */ 436 memset(&bprm, 0, sizeof(bprm)); 437 438 /* Zero out image_info */ 439 memset(info, 0, sizeof(struct image_info)); 440 441 /* Scan interp_prefix dir for replacement files. */ 442 init_paths(interp_prefix); 443 444 if (cpu_model == NULL) { 445 cpu_model = TARGET_DEFAULT_CPU_MODEL; 446 } 447 448 cpu_type = parse_cpu_option(cpu_model); 449 450 /* init tcg before creating CPUs and to get qemu_host_page_size */ 451 { 452 AccelState *accel = current_accel(); 453 AccelClass *ac = ACCEL_GET_CLASS(accel); 454 455 accel_init_interfaces(ac); 456 object_property_set_bool(OBJECT(accel), "one-insn-per-tb", 457 opt_one_insn_per_tb, &error_abort); 458 ac->init_machine(NULL); 459 } 460 cpu = cpu_create(cpu_type); 461 env = cpu_env(cpu); 462 cpu_reset(cpu); 463 thread_cpu = cpu; 464 465 if (getenv("QEMU_STRACE")) { 466 do_strace = 1; 467 } 468 469 target_environ = envlist_to_environ(envlist, NULL); 470 envlist_free(envlist); 471 472 { 473 Error *err = NULL; 474 if (seed_optarg != NULL) { 475 qemu_guest_random_seed_main(seed_optarg, &err); 476 } else { 477 qcrypto_init(&err); 478 } 479 if (err) { 480 error_reportf_err(err, "cannot initialize crypto: "); 481 exit(1); 482 } 483 } 484 485 /* 486 * Now that page sizes are configured we can do 487 * proper page alignment for guest_base. 488 */ 489 if (have_guest_base) { 490 if (guest_base & ~qemu_host_page_mask) { 491 error_report("Selected guest base not host page aligned"); 492 exit(1); 493 } 494 } 495 496 /* 497 * If reserving host virtual address space, do so now. 498 * Combined with '-B', ensure that the chosen range is free. 499 */ 500 if (reserved_va) { 501 void *p; 502 503 if (have_guest_base) { 504 p = mmap((void *)guest_base, reserved_va + 1, PROT_NONE, 505 MAP_ANON | MAP_PRIVATE | MAP_FIXED | MAP_EXCL, -1, 0); 506 } else { 507 p = mmap(NULL, reserved_va + 1, PROT_NONE, 508 MAP_ANON | MAP_PRIVATE, -1, 0); 509 } 510 if (p == MAP_FAILED) { 511 const char *err = strerror(errno); 512 char *sz = size_to_str(reserved_va + 1); 513 514 if (have_guest_base) { 515 error_report("Cannot allocate %s bytes at -B %p for guest " 516 "address space: %s", sz, (void *)guest_base, err); 517 } else { 518 error_report("Cannot allocate %s bytes for guest " 519 "address space: %s", sz, err); 520 } 521 exit(1); 522 } 523 guest_base = (uintptr_t)p; 524 have_guest_base = true; 525 526 /* Ensure that mmap_next_start is within range. */ 527 if (reserved_va <= mmap_next_start) { 528 mmap_next_start = (reserved_va / 4 * 3) 529 & TARGET_PAGE_MASK & qemu_host_page_mask; 530 } 531 } 532 533 if (loader_exec(filename, argv + optind, target_environ, regs, info, 534 &bprm) != 0) { 535 printf("Error loading %s\n", filename); 536 _exit(1); 537 } 538 539 for (wrk = target_environ; *wrk; wrk++) { 540 g_free(*wrk); 541 } 542 543 g_free(target_environ); 544 545 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 546 FILE *f = qemu_log_trylock(); 547 if (f) { 548 fprintf(f, "guest_base %p\n", (void *)guest_base); 549 fprintf(f, "page layout changed following binary load\n"); 550 page_dump(f); 551 552 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", 553 info->end_code); 554 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", 555 info->start_code); 556 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", 557 info->start_data); 558 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", 559 info->end_data); 560 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", 561 info->start_stack); 562 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 563 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 564 565 qemu_log_unlock(f); 566 } 567 } 568 569 /* build Task State */ 570 ts = g_new0(TaskState, 1); 571 init_task_state(ts); 572 ts->info = info; 573 ts->bprm = &bprm; 574 cpu->opaque = ts; 575 576 target_set_brk(info->brk); 577 syscall_init(); 578 signal_init(); 579 580 /* 581 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 582 * generating the prologue until now so that the prologue can take 583 * the real value of GUEST_BASE into account. 584 */ 585 tcg_prologue_init(); 586 587 target_cpu_init(env, regs); 588 589 if (gdbstub) { 590 gdbserver_start(gdbstub); 591 gdb_handlesig(cpu, 0); 592 } 593 cpu_loop(env); 594 /* never exits */ 595 return 0; 596 } 597