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 ts->sigaltstack_used = (struct target_sigaltstack) { 221 .ss_sp = 0, 222 .ss_size = 0, 223 .ss_flags = TARGET_SS_DISABLE, 224 }; 225 } 226 227 void gemu_log(const char *fmt, ...) 228 { 229 va_list ap; 230 231 va_start(ap, fmt); 232 vfprintf(stderr, fmt, ap); 233 va_end(ap); 234 } 235 236 static void 237 adjust_ssize(void) 238 { 239 struct rlimit rl; 240 241 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 242 return; 243 } 244 245 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 246 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 247 248 rl.rlim_max = target_maxssiz; 249 rl.rlim_cur = target_dflssiz; 250 setrlimit(RLIMIT_STACK, &rl); 251 } 252 253 static void save_proc_pathname(char *argv0) 254 { 255 int mib[4]; 256 size_t len; 257 258 mib[0] = CTL_KERN; 259 mib[1] = KERN_PROC; 260 mib[2] = KERN_PROC_PATHNAME; 261 mib[3] = -1; 262 263 len = sizeof(qemu_proc_pathname); 264 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 265 perror("sysctl"); 266 } 267 } 268 269 int main(int argc, char **argv) 270 { 271 const char *filename; 272 const char *cpu_model; 273 const char *cpu_type; 274 const char *log_file = NULL; 275 const char *log_mask = NULL; 276 const char *seed_optarg = NULL; 277 struct target_pt_regs regs1, *regs = ®s1; 278 struct image_info info1, *info = &info1; 279 struct bsd_binprm bprm; 280 TaskState *ts; 281 CPUArchState *env; 282 CPUState *cpu; 283 int optind, rv; 284 const char *r; 285 const char *gdbstub = NULL; 286 char **target_environ, **wrk; 287 envlist_t *envlist = NULL; 288 bsd_type = HOST_DEFAULT_BSD_TYPE; 289 char *argv0 = NULL; 290 291 adjust_ssize(); 292 293 if (argc <= 1) { 294 usage(); 295 } 296 297 save_proc_pathname(argv[0]); 298 299 error_init(argv[0]); 300 module_call_init(MODULE_INIT_TRACE); 301 qemu_init_cpu_list(); 302 module_call_init(MODULE_INIT_QOM); 303 304 envlist = envlist_create(); 305 306 /* add current environment into the list */ 307 for (wrk = environ; *wrk != NULL; 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 /* XXX: implement xxx_cpu_list for targets that still miss it */ 382 #if defined(cpu_list) 383 cpu_list(); 384 #endif 385 exit(1); 386 } 387 } else if (!strcmp(r, "B")) { 388 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 389 if (rv < 0) { 390 usage(); 391 } 392 have_guest_base = true; 393 } else if (!strcmp(r, "drop-ld-preload")) { 394 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 395 } else if (!strcmp(r, "bsd")) { 396 if (!strcasecmp(argv[optind], "freebsd")) { 397 bsd_type = target_freebsd; 398 } else if (!strcasecmp(argv[optind], "netbsd")) { 399 bsd_type = target_netbsd; 400 } else if (!strcasecmp(argv[optind], "openbsd")) { 401 bsd_type = target_openbsd; 402 } else { 403 usage(); 404 } 405 optind++; 406 } else if (!strcmp(r, "seed")) { 407 seed_optarg = optarg; 408 } else if (!strcmp(r, "singlestep")) { 409 singlestep = 1; 410 } else if (!strcmp(r, "strace")) { 411 do_strace = 1; 412 } else if (!strcmp(r, "trace")) { 413 trace_opt_parse(optarg); 414 } else if (!strcmp(r, "0")) { 415 argv0 = argv[optind++]; 416 } else { 417 usage(); 418 } 419 } 420 421 /* init debug */ 422 qemu_log_needs_buffers(); 423 qemu_set_log_filename(log_file, &error_fatal); 424 if (log_mask) { 425 int mask; 426 427 mask = qemu_str_to_log_mask(log_mask); 428 if (!mask) { 429 qemu_print_log_usage(stdout); 430 exit(1); 431 } 432 qemu_set_log(mask); 433 } 434 435 if (optind >= argc) { 436 usage(); 437 } 438 filename = argv[optind]; 439 if (argv0) { 440 argv[optind] = argv0; 441 } 442 443 if (!trace_init_backends()) { 444 exit(1); 445 } 446 trace_init_file(); 447 448 /* Zero out regs */ 449 memset(regs, 0, sizeof(struct target_pt_regs)); 450 451 /* Zero bsd params */ 452 memset(&bprm, 0, sizeof(bprm)); 453 454 /* Zero out image_info */ 455 memset(info, 0, sizeof(struct image_info)); 456 457 /* Scan interp_prefix dir for replacement files. */ 458 init_paths(interp_prefix); 459 460 if (cpu_model == NULL) { 461 cpu_model = TARGET_DEFAULT_CPU_MODEL; 462 } 463 464 cpu_type = parse_cpu_option(cpu_model); 465 466 /* init tcg before creating CPUs and to get qemu_host_page_size */ 467 { 468 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 469 470 accel_init_interfaces(ac); 471 ac->init_machine(NULL); 472 } 473 cpu = cpu_create(cpu_type); 474 env = cpu->env_ptr; 475 cpu_reset(cpu); 476 thread_cpu = cpu; 477 478 if (getenv("QEMU_STRACE")) { 479 do_strace = 1; 480 } 481 482 target_environ = envlist_to_environ(envlist, NULL); 483 envlist_free(envlist); 484 485 if (reserved_va) { 486 mmap_next_start = reserved_va; 487 } 488 489 { 490 Error *err = NULL; 491 if (seed_optarg != NULL) { 492 qemu_guest_random_seed_main(seed_optarg, &err); 493 } else { 494 qcrypto_init(&err); 495 } 496 if (err) { 497 error_reportf_err(err, "cannot initialize crypto: "); 498 exit(1); 499 } 500 } 501 502 /* 503 * Now that page sizes are configured we can do 504 * proper page alignment for guest_base. 505 */ 506 guest_base = HOST_PAGE_ALIGN(guest_base); 507 508 if (loader_exec(filename, argv + optind, target_environ, regs, info, 509 &bprm) != 0) { 510 printf("Error loading %s\n", filename); 511 _exit(1); 512 } 513 514 for (wrk = target_environ; *wrk; wrk++) { 515 g_free(*wrk); 516 } 517 518 g_free(target_environ); 519 520 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 521 qemu_log("guest_base %p\n", (void *)guest_base); 522 log_page_dump("binary load"); 523 524 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); 525 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); 526 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", 527 info->start_code); 528 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", 529 info->start_data); 530 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); 531 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", 532 info->start_stack); 533 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 534 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 535 } 536 537 /* build Task State */ 538 ts = g_new0(TaskState, 1); 539 init_task_state(ts); 540 ts->info = info; 541 ts->bprm = &bprm; 542 cpu->opaque = ts; 543 544 target_set_brk(info->brk); 545 syscall_init(); 546 signal_init(); 547 548 /* 549 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 550 * generating the prologue until now so that the prologue can take 551 * the real value of GUEST_BASE into account. 552 */ 553 tcg_prologue_init(tcg_ctx); 554 555 target_cpu_init(env, regs); 556 557 if (gdbstub) { 558 gdbserver_start(gdbstub); 559 gdb_handlesig(cpu, 0); 560 } 561 cpu_loop(env); 562 /* never exits */ 563 return 0; 564 } 565