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 "-singlestep deprecated synonym for -one-insn-per-tb\n" 167 "-strace log system calls\n" 168 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 169 " specify tracing options\n" 170 "\n" 171 "Environment variables:\n" 172 "QEMU_STRACE Print system calls and arguments similar to the\n" 173 " 'strace' program. Enable by setting to any value.\n" 174 "You can use -E and -U options to set/unset environment variables\n" 175 "for target process. It is possible to provide several variables\n" 176 "by repeating the option. For example:\n" 177 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 178 "Note that if you provide several changes to single variable\n" 179 "last change will stay in effect.\n" 180 "\n" 181 QEMU_HELP_BOTTOM "\n" 182 , 183 TARGET_NAME, 184 interp_prefix, 185 target_dflssiz); 186 exit(1); 187 } 188 189 __thread CPUState *thread_cpu; 190 191 void stop_all_tasks(void) 192 { 193 /* 194 * We trust when using NPTL (pthreads) start_exclusive() handles thread 195 * stopping correctly. 196 */ 197 start_exclusive(); 198 } 199 200 bool qemu_cpu_is_self(CPUState *cpu) 201 { 202 return thread_cpu == cpu; 203 } 204 205 void qemu_cpu_kick(CPUState *cpu) 206 { 207 cpu_exit(cpu); 208 } 209 210 /* Assumes contents are already zeroed. */ 211 static void init_task_state(TaskState *ts) 212 { 213 ts->sigaltstack_used = (struct target_sigaltstack) { 214 .ss_sp = 0, 215 .ss_size = 0, 216 .ss_flags = TARGET_SS_DISABLE, 217 }; 218 } 219 220 void gemu_log(const char *fmt, ...) 221 { 222 va_list ap; 223 224 va_start(ap, fmt); 225 vfprintf(stderr, fmt, ap); 226 va_end(ap); 227 } 228 229 static void 230 adjust_ssize(void) 231 { 232 struct rlimit rl; 233 234 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 235 return; 236 } 237 238 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 239 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 240 241 rl.rlim_max = target_maxssiz; 242 rl.rlim_cur = target_dflssiz; 243 setrlimit(RLIMIT_STACK, &rl); 244 } 245 246 static void save_proc_pathname(char *argv0) 247 { 248 int mib[4]; 249 size_t len; 250 251 mib[0] = CTL_KERN; 252 mib[1] = KERN_PROC; 253 mib[2] = KERN_PROC_PATHNAME; 254 mib[3] = -1; 255 256 len = sizeof(qemu_proc_pathname); 257 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 258 perror("sysctl"); 259 } 260 } 261 262 int main(int argc, char **argv) 263 { 264 const char *filename; 265 const char *cpu_model; 266 const char *cpu_type; 267 const char *log_file = NULL; 268 const char *log_mask = NULL; 269 const char *seed_optarg = NULL; 270 struct target_pt_regs regs1, *regs = ®s1; 271 struct image_info info1, *info = &info1; 272 struct bsd_binprm bprm; 273 TaskState *ts; 274 CPUArchState *env; 275 CPUState *cpu; 276 int optind, rv; 277 const char *r; 278 const char *gdbstub = NULL; 279 char **target_environ, **wrk; 280 envlist_t *envlist = NULL; 281 char *argv0 = NULL; 282 283 adjust_ssize(); 284 285 if (argc <= 1) { 286 usage(); 287 } 288 289 save_proc_pathname(argv[0]); 290 291 error_init(argv[0]); 292 module_call_init(MODULE_INIT_TRACE); 293 qemu_init_cpu_list(); 294 module_call_init(MODULE_INIT_QOM); 295 296 envlist = envlist_create(); 297 298 /* 299 * add current environment into the list 300 * envlist_setenv adds to the front of the list; to preserve environ 301 * order add from back to front 302 */ 303 for (wrk = environ; *wrk != NULL; wrk++) { 304 continue; 305 } 306 while (wrk != environ) { 307 wrk--; 308 (void) envlist_setenv(envlist, *wrk); 309 } 310 311 cpu_model = NULL; 312 313 qemu_add_opts(&qemu_trace_opts); 314 315 optind = 1; 316 for (;;) { 317 if (optind >= argc) { 318 break; 319 } 320 r = argv[optind]; 321 if (r[0] != '-') { 322 break; 323 } 324 optind++; 325 r++; 326 if (!strcmp(r, "-")) { 327 break; 328 } else if (!strcmp(r, "d")) { 329 if (optind >= argc) { 330 break; 331 } 332 log_mask = argv[optind++]; 333 } else if (!strcmp(r, "D")) { 334 if (optind >= argc) { 335 break; 336 } 337 log_file = argv[optind++]; 338 } else if (!strcmp(r, "E")) { 339 r = argv[optind++]; 340 if (envlist_setenv(envlist, r) != 0) { 341 usage(); 342 } 343 } else if (!strcmp(r, "ignore-environment")) { 344 envlist_free(envlist); 345 envlist = envlist_create(); 346 } else if (!strcmp(r, "U")) { 347 r = argv[optind++]; 348 if (envlist_unsetenv(envlist, r) != 0) { 349 usage(); 350 } 351 } else if (!strcmp(r, "s")) { 352 r = argv[optind++]; 353 rv = qemu_strtoul(r, &r, 0, &target_dflssiz); 354 if (rv < 0 || target_dflssiz <= 0) { 355 usage(); 356 } 357 if (*r == 'M') { 358 target_dflssiz *= 1024 * 1024; 359 } else if (*r == 'k' || *r == 'K') { 360 target_dflssiz *= 1024; 361 } 362 if (target_dflssiz > target_maxssiz) { 363 usage(); 364 } 365 } else if (!strcmp(r, "L")) { 366 interp_prefix = argv[optind++]; 367 } else if (!strcmp(r, "p")) { 368 qemu_host_page_size = atoi(argv[optind++]); 369 if (qemu_host_page_size == 0 || 370 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 371 fprintf(stderr, "page size must be a power of two\n"); 372 exit(1); 373 } 374 } else if (!strcmp(r, "g")) { 375 gdbstub = g_strdup(argv[optind++]); 376 } else if (!strcmp(r, "r")) { 377 qemu_uname_release = argv[optind++]; 378 } else if (!strcmp(r, "cpu")) { 379 cpu_model = argv[optind++]; 380 if (is_help_option(cpu_model)) { 381 list_cpus(); 382 exit(1); 383 } 384 } else if (!strcmp(r, "B")) { 385 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 386 if (rv < 0) { 387 usage(); 388 } 389 have_guest_base = true; 390 } else if (!strcmp(r, "drop-ld-preload")) { 391 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 392 } else if (!strcmp(r, "seed")) { 393 seed_optarg = optarg; 394 } else if (!strcmp(r, "singlestep") || !strcmp(r, "one-insn-per-tb")) { 395 opt_one_insn_per_tb = true; 396 } else if (!strcmp(r, "strace")) { 397 do_strace = 1; 398 } else if (!strcmp(r, "trace")) { 399 trace_opt_parse(optarg); 400 } else if (!strcmp(r, "0")) { 401 argv0 = argv[optind++]; 402 } else { 403 usage(); 404 } 405 } 406 407 /* init debug */ 408 { 409 int mask = 0; 410 if (log_mask) { 411 mask = qemu_str_to_log_mask(log_mask); 412 if (!mask) { 413 qemu_print_log_usage(stdout); 414 exit(1); 415 } 416 } 417 qemu_set_log_filename_flags(log_file, mask, &error_fatal); 418 } 419 420 if (optind >= argc) { 421 usage(); 422 } 423 filename = argv[optind]; 424 if (argv0) { 425 argv[optind] = argv0; 426 } 427 428 if (!trace_init_backends()) { 429 exit(1); 430 } 431 trace_init_file(); 432 433 /* Zero out regs */ 434 memset(regs, 0, sizeof(struct target_pt_regs)); 435 436 /* Zero bsd params */ 437 memset(&bprm, 0, sizeof(bprm)); 438 439 /* Zero out image_info */ 440 memset(info, 0, sizeof(struct image_info)); 441 442 /* Scan interp_prefix dir for replacement files. */ 443 init_paths(interp_prefix); 444 445 if (cpu_model == NULL) { 446 cpu_model = TARGET_DEFAULT_CPU_MODEL; 447 } 448 449 cpu_type = parse_cpu_option(cpu_model); 450 451 /* init tcg before creating CPUs and to get qemu_host_page_size */ 452 { 453 AccelState *accel = current_accel(); 454 AccelClass *ac = ACCEL_GET_CLASS(accel); 455 456 accel_init_interfaces(ac); 457 object_property_set_bool(OBJECT(accel), "one-insn-per-tb", 458 opt_one_insn_per_tb, &error_abort); 459 ac->init_machine(NULL); 460 } 461 cpu = cpu_create(cpu_type); 462 env = cpu_env(cpu); 463 cpu_reset(cpu); 464 thread_cpu = cpu; 465 466 if (getenv("QEMU_STRACE")) { 467 do_strace = 1; 468 } 469 470 target_environ = envlist_to_environ(envlist, NULL); 471 envlist_free(envlist); 472 473 { 474 Error *err = NULL; 475 if (seed_optarg != NULL) { 476 qemu_guest_random_seed_main(seed_optarg, &err); 477 } else { 478 qcrypto_init(&err); 479 } 480 if (err) { 481 error_reportf_err(err, "cannot initialize crypto: "); 482 exit(1); 483 } 484 } 485 486 /* 487 * Now that page sizes are configured we can do 488 * proper page alignment for guest_base. 489 */ 490 if (have_guest_base) { 491 if (guest_base & ~qemu_host_page_mask) { 492 error_report("Selected guest base not host page aligned"); 493 exit(1); 494 } 495 } 496 497 /* 498 * If reserving host virtual address space, do so now. 499 * Combined with '-B', ensure that the chosen range is free. 500 */ 501 if (reserved_va) { 502 void *p; 503 504 if (have_guest_base) { 505 p = mmap((void *)guest_base, reserved_va + 1, PROT_NONE, 506 MAP_ANON | MAP_PRIVATE | MAP_FIXED | MAP_EXCL, -1, 0); 507 } else { 508 p = mmap(NULL, reserved_va + 1, PROT_NONE, 509 MAP_ANON | MAP_PRIVATE, -1, 0); 510 } 511 if (p == MAP_FAILED) { 512 const char *err = strerror(errno); 513 char *sz = size_to_str(reserved_va + 1); 514 515 if (have_guest_base) { 516 error_report("Cannot allocate %s bytes at -B %p for guest " 517 "address space: %s", sz, (void *)guest_base, err); 518 } else { 519 error_report("Cannot allocate %s bytes for guest " 520 "address space: %s", sz, err); 521 } 522 exit(1); 523 } 524 guest_base = (uintptr_t)p; 525 have_guest_base = true; 526 527 /* Ensure that mmap_next_start is within range. */ 528 if (reserved_va <= mmap_next_start) { 529 mmap_next_start = (reserved_va / 4 * 3) 530 & TARGET_PAGE_MASK & qemu_host_page_mask; 531 } 532 } 533 534 if (loader_exec(filename, argv + optind, target_environ, regs, info, 535 &bprm) != 0) { 536 printf("Error loading %s\n", filename); 537 _exit(1); 538 } 539 540 for (wrk = target_environ; *wrk; wrk++) { 541 g_free(*wrk); 542 } 543 544 g_free(target_environ); 545 546 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 547 FILE *f = qemu_log_trylock(); 548 if (f) { 549 fprintf(f, "guest_base %p\n", (void *)guest_base); 550 fprintf(f, "page layout changed following binary load\n"); 551 page_dump(f); 552 553 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", 554 info->end_code); 555 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", 556 info->start_code); 557 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", 558 info->start_data); 559 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", 560 info->end_data); 561 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", 562 info->start_stack); 563 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 564 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 565 566 qemu_log_unlock(f); 567 } 568 } 569 570 /* build Task State */ 571 ts = g_new0(TaskState, 1); 572 init_task_state(ts); 573 ts->info = info; 574 ts->bprm = &bprm; 575 cpu->opaque = ts; 576 577 target_set_brk(info->brk); 578 syscall_init(); 579 signal_init(); 580 581 /* 582 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 583 * generating the prologue until now so that the prologue can take 584 * the real value of GUEST_BASE into account. 585 */ 586 tcg_prologue_init(); 587 588 target_cpu_init(env, regs); 589 590 if (gdbstub) { 591 gdbserver_start(gdbstub); 592 gdb_handlesig(cpu, 0); 593 } 594 cpu_loop(env); 595 /* never exits */ 596 return 0; 597 } 598