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 "\n" 168 "Debug options:\n" 169 "-d item1[,...] enable logging of specified items\n" 170 " (use '-d help' for a list of log items)\n" 171 "-D logfile write logs to 'logfile' (default stderr)\n" 172 "-singlestep always run in singlestep mode\n" 173 "-strace log system calls\n" 174 "-trace [[enable=]<pattern>][,events=<file>][,file=<file>]\n" 175 " specify tracing options\n" 176 "\n" 177 "Environment variables:\n" 178 "QEMU_STRACE Print system calls and arguments similar to the\n" 179 " 'strace' program. Enable by setting to any value.\n" 180 "You can use -E and -U options to set/unset environment variables\n" 181 "for target process. It is possible to provide several variables\n" 182 "by repeating the option. For example:\n" 183 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 184 "Note that if you provide several changes to single variable\n" 185 "last change will stay in effect.\n" 186 "\n" 187 QEMU_HELP_BOTTOM "\n" 188 , 189 TARGET_NAME, 190 interp_prefix, 191 target_dflssiz); 192 exit(1); 193 } 194 195 __thread CPUState *thread_cpu; 196 197 void stop_all_tasks(void) 198 { 199 /* 200 * We trust when using NPTL (pthreads) start_exclusive() handles thread 201 * stopping correctly. 202 */ 203 start_exclusive(); 204 } 205 206 bool qemu_cpu_is_self(CPUState *cpu) 207 { 208 return thread_cpu == cpu; 209 } 210 211 void qemu_cpu_kick(CPUState *cpu) 212 { 213 cpu_exit(cpu); 214 } 215 216 /* Assumes contents are already zeroed. */ 217 static void init_task_state(TaskState *ts) 218 { 219 ts->sigaltstack_used = (struct target_sigaltstack) { 220 .ss_sp = 0, 221 .ss_size = 0, 222 .ss_flags = TARGET_SS_DISABLE, 223 }; 224 } 225 226 void gemu_log(const char *fmt, ...) 227 { 228 va_list ap; 229 230 va_start(ap, fmt); 231 vfprintf(stderr, fmt, ap); 232 va_end(ap); 233 } 234 235 static void 236 adjust_ssize(void) 237 { 238 struct rlimit rl; 239 240 if (getrlimit(RLIMIT_STACK, &rl) != 0) { 241 return; 242 } 243 244 target_maxssiz = MIN(target_maxssiz, rl.rlim_max); 245 target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz); 246 247 rl.rlim_max = target_maxssiz; 248 rl.rlim_cur = target_dflssiz; 249 setrlimit(RLIMIT_STACK, &rl); 250 } 251 252 static void save_proc_pathname(char *argv0) 253 { 254 int mib[4]; 255 size_t len; 256 257 mib[0] = CTL_KERN; 258 mib[1] = KERN_PROC; 259 mib[2] = KERN_PROC_PATHNAME; 260 mib[3] = -1; 261 262 len = sizeof(qemu_proc_pathname); 263 if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) { 264 perror("sysctl"); 265 } 266 } 267 268 int main(int argc, char **argv) 269 { 270 const char *filename; 271 const char *cpu_model; 272 const char *cpu_type; 273 const char *log_file = NULL; 274 const char *log_mask = NULL; 275 const char *seed_optarg = NULL; 276 struct target_pt_regs regs1, *regs = ®s1; 277 struct image_info info1, *info = &info1; 278 struct bsd_binprm bprm; 279 TaskState *ts; 280 CPUArchState *env; 281 CPUState *cpu; 282 int optind, rv; 283 const char *r; 284 const char *gdbstub = NULL; 285 char **target_environ, **wrk; 286 envlist_t *envlist = NULL; 287 bsd_type = HOST_DEFAULT_BSD_TYPE; 288 char *argv0 = NULL; 289 290 adjust_ssize(); 291 292 if (argc <= 1) { 293 usage(); 294 } 295 296 save_proc_pathname(argv[0]); 297 298 error_init(argv[0]); 299 module_call_init(MODULE_INIT_TRACE); 300 qemu_init_cpu_list(); 301 module_call_init(MODULE_INIT_QOM); 302 303 envlist = envlist_create(); 304 305 /* add current environment into the list */ 306 for (wrk = environ; *wrk != NULL; 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 /* XXX: implement xxx_cpu_list for targets that still miss it */ 381 #if defined(cpu_list) 382 cpu_list(); 383 #endif 384 exit(1); 385 } 386 } else if (!strcmp(r, "B")) { 387 rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base); 388 if (rv < 0) { 389 usage(); 390 } 391 have_guest_base = true; 392 } else if (!strcmp(r, "drop-ld-preload")) { 393 (void) envlist_unsetenv(envlist, "LD_PRELOAD"); 394 } else if (!strcmp(r, "seed")) { 395 seed_optarg = optarg; 396 } else if (!strcmp(r, "singlestep")) { 397 singlestep = 1; 398 } else if (!strcmp(r, "strace")) { 399 do_strace = 1; 400 } else if (!strcmp(r, "trace")) { 401 trace_opt_parse(optarg); 402 } else if (!strcmp(r, "0")) { 403 argv0 = argv[optind++]; 404 } else { 405 usage(); 406 } 407 } 408 409 /* init debug */ 410 qemu_log_needs_buffers(); 411 qemu_set_log_filename(log_file, &error_fatal); 412 if (log_mask) { 413 int mask; 414 415 mask = qemu_str_to_log_mask(log_mask); 416 if (!mask) { 417 qemu_print_log_usage(stdout); 418 exit(1); 419 } 420 qemu_set_log(mask); 421 } 422 423 if (optind >= argc) { 424 usage(); 425 } 426 filename = argv[optind]; 427 if (argv0) { 428 argv[optind] = argv0; 429 } 430 431 if (!trace_init_backends()) { 432 exit(1); 433 } 434 trace_init_file(); 435 436 /* Zero out regs */ 437 memset(regs, 0, sizeof(struct target_pt_regs)); 438 439 /* Zero bsd params */ 440 memset(&bprm, 0, sizeof(bprm)); 441 442 /* Zero out image_info */ 443 memset(info, 0, sizeof(struct image_info)); 444 445 /* Scan interp_prefix dir for replacement files. */ 446 init_paths(interp_prefix); 447 448 if (cpu_model == NULL) { 449 cpu_model = TARGET_DEFAULT_CPU_MODEL; 450 } 451 452 cpu_type = parse_cpu_option(cpu_model); 453 454 /* init tcg before creating CPUs and to get qemu_host_page_size */ 455 { 456 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 457 458 accel_init_interfaces(ac); 459 ac->init_machine(NULL); 460 } 461 cpu = cpu_create(cpu_type); 462 env = cpu->env_ptr; 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 if (reserved_va) { 474 mmap_next_start = reserved_va; 475 } 476 477 { 478 Error *err = NULL; 479 if (seed_optarg != NULL) { 480 qemu_guest_random_seed_main(seed_optarg, &err); 481 } else { 482 qcrypto_init(&err); 483 } 484 if (err) { 485 error_reportf_err(err, "cannot initialize crypto: "); 486 exit(1); 487 } 488 } 489 490 /* 491 * Now that page sizes are configured we can do 492 * proper page alignment for guest_base. 493 */ 494 guest_base = HOST_PAGE_ALIGN(guest_base); 495 496 if (loader_exec(filename, argv + optind, target_environ, regs, info, 497 &bprm) != 0) { 498 printf("Error loading %s\n", filename); 499 _exit(1); 500 } 501 502 for (wrk = target_environ; *wrk; wrk++) { 503 g_free(*wrk); 504 } 505 506 g_free(target_environ); 507 508 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 509 qemu_log("guest_base %p\n", (void *)guest_base); 510 log_page_dump("binary load"); 511 512 qemu_log("start_brk 0x" TARGET_ABI_FMT_lx "\n", info->start_brk); 513 qemu_log("end_code 0x" TARGET_ABI_FMT_lx "\n", info->end_code); 514 qemu_log("start_code 0x" TARGET_ABI_FMT_lx "\n", 515 info->start_code); 516 qemu_log("start_data 0x" TARGET_ABI_FMT_lx "\n", 517 info->start_data); 518 qemu_log("end_data 0x" TARGET_ABI_FMT_lx "\n", info->end_data); 519 qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", 520 info->start_stack); 521 qemu_log("brk 0x" TARGET_ABI_FMT_lx "\n", info->brk); 522 qemu_log("entry 0x" TARGET_ABI_FMT_lx "\n", info->entry); 523 } 524 525 /* build Task State */ 526 ts = g_new0(TaskState, 1); 527 init_task_state(ts); 528 ts->info = info; 529 ts->bprm = &bprm; 530 cpu->opaque = ts; 531 532 target_set_brk(info->brk); 533 syscall_init(); 534 signal_init(); 535 536 /* 537 * Now that we've loaded the binary, GUEST_BASE is fixed. Delay 538 * generating the prologue until now so that the prologue can take 539 * the real value of GUEST_BASE into account. 540 */ 541 tcg_prologue_init(tcg_ctx); 542 543 target_cpu_init(env, regs); 544 545 if (gdbstub) { 546 gdbserver_start(gdbstub); 547 gdb_handlesig(cpu, 0); 548 } 549 cpu_loop(env); 550 /* never exits */ 551 return 0; 552 } 553