1 /* 2 * qemu user main 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/help-texts.h" 22 #include "qemu/units.h" 23 #include "qemu/accel.h" 24 #include "qemu-version.h" 25 #include <sys/syscall.h> 26 #include <sys/resource.h> 27 #include <sys/shm.h> 28 #include <linux/binfmts.h> 29 30 #include "qapi/error.h" 31 #include "qemu.h" 32 #include "user-internals.h" 33 #include "qemu/path.h" 34 #include "qemu/queue.h" 35 #include "qemu/config-file.h" 36 #include "qemu/cutils.h" 37 #include "qemu/error-report.h" 38 #include "qemu/help_option.h" 39 #include "qemu/module.h" 40 #include "qemu/plugin.h" 41 #include "exec/exec-all.h" 42 #include "exec/gdbstub.h" 43 #include "tcg/tcg.h" 44 #include "qemu/timer.h" 45 #include "qemu/envlist.h" 46 #include "qemu/guest-random.h" 47 #include "elf.h" 48 #include "trace/control.h" 49 #include "target_elf.h" 50 #include "cpu_loop-common.h" 51 #include "crypto/init.h" 52 #include "fd-trans.h" 53 #include "signal-common.h" 54 #include "loader.h" 55 #include "user-mmap.h" 56 57 #ifdef CONFIG_SEMIHOSTING 58 #include "semihosting/semihost.h" 59 #endif 60 61 #ifndef AT_FLAGS_PRESERVE_ARGV0 62 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0 63 #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT) 64 #endif 65 66 char *exec_path; 67 68 int singlestep; 69 static const char *argv0; 70 static const char *gdbstub; 71 static envlist_t *envlist; 72 static const char *cpu_model; 73 static const char *cpu_type; 74 static const char *seed_optarg; 75 unsigned long mmap_min_addr; 76 uintptr_t guest_base; 77 bool have_guest_base; 78 79 /* 80 * Used to implement backwards-compatibility for the `-strace`, and 81 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by 82 * -strace, or vice versa. 83 */ 84 static bool enable_strace; 85 86 /* 87 * The last log mask given by the user in an environment variable or argument. 88 * Used to support command line arguments overriding environment variables. 89 */ 90 static int last_log_mask; 91 static const char *last_log_filename; 92 93 /* 94 * When running 32-on-64 we should make sure we can fit all of the possible 95 * guest address space into a contiguous chunk of virtual host memory. 96 * 97 * This way we will never overlap with our own libraries or binaries or stack 98 * or anything else that QEMU maps. 99 * 100 * Many cpus reserve the high bit (or more than one for some 64-bit cpus) 101 * of the address for the kernel. Some cpus rely on this and user space 102 * uses the high bit(s) for pointer tagging and the like. For them, we 103 * must preserve the expected address space. 104 */ 105 #ifndef MAX_RESERVED_VA 106 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS 107 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ 108 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) 109 /* There are a number of places where we assign reserved_va to a variable 110 of type abi_ulong and expect it to fit. Avoid the last page. */ 111 # define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK) 112 # else 113 # define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS) 114 # endif 115 # else 116 # define MAX_RESERVED_VA(CPU) 0 117 # endif 118 #endif 119 120 unsigned long reserved_va; 121 122 static void usage(int exitcode); 123 124 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; 125 const char *qemu_uname_release; 126 127 #if !defined(TARGET_DEFAULT_STACK_SIZE) 128 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so 129 we allocate a bigger stack. Need a better solution, for example 130 by remapping the process stack directly at the right place */ 131 #define TARGET_DEFAULT_STACK_SIZE 8 * 1024 * 1024UL 132 #endif 133 134 unsigned long guest_stack_size = TARGET_DEFAULT_STACK_SIZE; 135 136 /***********************************************************/ 137 /* Helper routines for implementing atomic operations. */ 138 139 /* Make sure everything is in a consistent state for calling fork(). */ 140 void fork_start(void) 141 { 142 start_exclusive(); 143 mmap_fork_start(); 144 cpu_list_lock(); 145 } 146 147 void fork_end(int child) 148 { 149 mmap_fork_end(child); 150 if (child) { 151 CPUState *cpu, *next_cpu; 152 /* Child processes created by fork() only have a single thread. 153 Discard information about the parent threads. */ 154 CPU_FOREACH_SAFE(cpu, next_cpu) { 155 if (cpu != thread_cpu) { 156 QTAILQ_REMOVE_RCU(&cpus, cpu, node); 157 } 158 } 159 qemu_init_cpu_list(); 160 gdbserver_fork(thread_cpu); 161 /* qemu_init_cpu_list() takes care of reinitializing the 162 * exclusive state, so we don't need to end_exclusive() here. 163 */ 164 } else { 165 cpu_list_unlock(); 166 end_exclusive(); 167 } 168 } 169 170 __thread CPUState *thread_cpu; 171 172 bool qemu_cpu_is_self(CPUState *cpu) 173 { 174 return thread_cpu == cpu; 175 } 176 177 void qemu_cpu_kick(CPUState *cpu) 178 { 179 cpu_exit(cpu); 180 } 181 182 void task_settid(TaskState *ts) 183 { 184 if (ts->ts_tid == 0) { 185 ts->ts_tid = (pid_t)syscall(SYS_gettid); 186 } 187 } 188 189 void stop_all_tasks(void) 190 { 191 /* 192 * We trust that when using NPTL, start_exclusive() 193 * handles thread stopping correctly. 194 */ 195 start_exclusive(); 196 } 197 198 /* Assumes contents are already zeroed. */ 199 void init_task_state(TaskState *ts) 200 { 201 long ticks_per_sec; 202 struct timespec bt; 203 204 ts->used = 1; 205 ts->sigaltstack_used = (struct target_sigaltstack) { 206 .ss_sp = 0, 207 .ss_size = 0, 208 .ss_flags = TARGET_SS_DISABLE, 209 }; 210 211 /* Capture task start time relative to system boot */ 212 213 ticks_per_sec = sysconf(_SC_CLK_TCK); 214 215 if ((ticks_per_sec > 0) && !clock_gettime(CLOCK_BOOTTIME, &bt)) { 216 /* start_boottime is expressed in clock ticks */ 217 ts->start_boottime = bt.tv_sec * (uint64_t) ticks_per_sec; 218 ts->start_boottime += bt.tv_nsec * (uint64_t) ticks_per_sec / 219 NANOSECONDS_PER_SECOND; 220 } 221 } 222 223 CPUArchState *cpu_copy(CPUArchState *env) 224 { 225 CPUState *cpu = env_cpu(env); 226 CPUState *new_cpu = cpu_create(cpu_type); 227 CPUArchState *new_env = new_cpu->env_ptr; 228 CPUBreakpoint *bp; 229 230 /* Reset non arch specific state */ 231 cpu_reset(new_cpu); 232 233 new_cpu->tcg_cflags = cpu->tcg_cflags; 234 memcpy(new_env, env, sizeof(CPUArchState)); 235 236 /* Clone all break/watchpoints. 237 Note: Once we support ptrace with hw-debug register access, make sure 238 BP_CPU break/watchpoints are handled correctly on clone. */ 239 QTAILQ_INIT(&new_cpu->breakpoints); 240 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) { 241 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL); 242 } 243 244 return new_env; 245 } 246 247 static void handle_arg_help(const char *arg) 248 { 249 usage(EXIT_SUCCESS); 250 } 251 252 static void handle_arg_log(const char *arg) 253 { 254 last_log_mask = qemu_str_to_log_mask(arg); 255 if (!last_log_mask) { 256 qemu_print_log_usage(stdout); 257 exit(EXIT_FAILURE); 258 } 259 } 260 261 static void handle_arg_dfilter(const char *arg) 262 { 263 qemu_set_dfilter_ranges(arg, &error_fatal); 264 } 265 266 static void handle_arg_log_filename(const char *arg) 267 { 268 last_log_filename = arg; 269 } 270 271 static void handle_arg_set_env(const char *arg) 272 { 273 char *r, *p, *token; 274 r = p = strdup(arg); 275 while ((token = strsep(&p, ",")) != NULL) { 276 if (envlist_setenv(envlist, token) != 0) { 277 usage(EXIT_FAILURE); 278 } 279 } 280 free(r); 281 } 282 283 static void handle_arg_unset_env(const char *arg) 284 { 285 char *r, *p, *token; 286 r = p = strdup(arg); 287 while ((token = strsep(&p, ",")) != NULL) { 288 if (envlist_unsetenv(envlist, token) != 0) { 289 usage(EXIT_FAILURE); 290 } 291 } 292 free(r); 293 } 294 295 static void handle_arg_argv0(const char *arg) 296 { 297 argv0 = strdup(arg); 298 } 299 300 static void handle_arg_stack_size(const char *arg) 301 { 302 char *p; 303 guest_stack_size = strtoul(arg, &p, 0); 304 if (guest_stack_size == 0) { 305 usage(EXIT_FAILURE); 306 } 307 308 if (*p == 'M') { 309 guest_stack_size *= MiB; 310 } else if (*p == 'k' || *p == 'K') { 311 guest_stack_size *= KiB; 312 } 313 } 314 315 static void handle_arg_ld_prefix(const char *arg) 316 { 317 interp_prefix = strdup(arg); 318 } 319 320 static void handle_arg_pagesize(const char *arg) 321 { 322 qemu_host_page_size = atoi(arg); 323 if (qemu_host_page_size == 0 || 324 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 325 fprintf(stderr, "page size must be a power of two\n"); 326 exit(EXIT_FAILURE); 327 } 328 } 329 330 static void handle_arg_seed(const char *arg) 331 { 332 seed_optarg = arg; 333 } 334 335 static void handle_arg_gdb(const char *arg) 336 { 337 gdbstub = g_strdup(arg); 338 } 339 340 static void handle_arg_uname(const char *arg) 341 { 342 qemu_uname_release = strdup(arg); 343 } 344 345 static void handle_arg_cpu(const char *arg) 346 { 347 cpu_model = strdup(arg); 348 if (cpu_model == NULL || is_help_option(cpu_model)) { 349 /* XXX: implement xxx_cpu_list for targets that still miss it */ 350 #if defined(cpu_list) 351 cpu_list(); 352 #endif 353 exit(EXIT_FAILURE); 354 } 355 } 356 357 static void handle_arg_guest_base(const char *arg) 358 { 359 guest_base = strtol(arg, NULL, 0); 360 have_guest_base = true; 361 } 362 363 static void handle_arg_reserved_va(const char *arg) 364 { 365 char *p; 366 int shift = 0; 367 reserved_va = strtoul(arg, &p, 0); 368 switch (*p) { 369 case 'k': 370 case 'K': 371 shift = 10; 372 break; 373 case 'M': 374 shift = 20; 375 break; 376 case 'G': 377 shift = 30; 378 break; 379 } 380 if (shift) { 381 unsigned long unshifted = reserved_va; 382 p++; 383 reserved_va <<= shift; 384 if (reserved_va >> shift != unshifted) { 385 fprintf(stderr, "Reserved virtual address too big\n"); 386 exit(EXIT_FAILURE); 387 } 388 } 389 if (*p) { 390 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p); 391 exit(EXIT_FAILURE); 392 } 393 } 394 395 static void handle_arg_singlestep(const char *arg) 396 { 397 singlestep = 1; 398 } 399 400 static void handle_arg_strace(const char *arg) 401 { 402 enable_strace = true; 403 } 404 405 static void handle_arg_version(const char *arg) 406 { 407 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 408 "\n" QEMU_COPYRIGHT "\n"); 409 exit(EXIT_SUCCESS); 410 } 411 412 static void handle_arg_trace(const char *arg) 413 { 414 trace_opt_parse(arg); 415 } 416 417 #if defined(TARGET_XTENSA) 418 static void handle_arg_abi_call0(const char *arg) 419 { 420 xtensa_set_abi_call0(); 421 } 422 #endif 423 424 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins); 425 426 #ifdef CONFIG_PLUGIN 427 static void handle_arg_plugin(const char *arg) 428 { 429 qemu_plugin_opt_parse(arg, &plugins); 430 } 431 #endif 432 433 struct qemu_argument { 434 const char *argv; 435 const char *env; 436 bool has_arg; 437 void (*handle_opt)(const char *arg); 438 const char *example; 439 const char *help; 440 }; 441 442 static const struct qemu_argument arg_table[] = { 443 {"h", "", false, handle_arg_help, 444 "", "print this help"}, 445 {"help", "", false, handle_arg_help, 446 "", ""}, 447 {"g", "QEMU_GDB", true, handle_arg_gdb, 448 "port", "wait gdb connection to 'port'"}, 449 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix, 450 "path", "set the elf interpreter prefix to 'path'"}, 451 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size, 452 "size", "set the stack size to 'size' bytes"}, 453 {"cpu", "QEMU_CPU", true, handle_arg_cpu, 454 "model", "select CPU (-cpu help for list)"}, 455 {"E", "QEMU_SET_ENV", true, handle_arg_set_env, 456 "var=value", "sets targets environment variable (see below)"}, 457 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env, 458 "var", "unsets targets environment variable (see below)"}, 459 {"0", "QEMU_ARGV0", true, handle_arg_argv0, 460 "argv0", "forces target process argv[0] to be 'argv0'"}, 461 {"r", "QEMU_UNAME", true, handle_arg_uname, 462 "uname", "set qemu uname release string to 'uname'"}, 463 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base, 464 "address", "set guest_base address to 'address'"}, 465 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va, 466 "size", "reserve 'size' bytes for guest virtual address space"}, 467 {"d", "QEMU_LOG", true, handle_arg_log, 468 "item[,...]", "enable logging of specified items " 469 "(use '-d help' for a list of items)"}, 470 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter, 471 "range[,...]","filter logging based on address range"}, 472 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename, 473 "logfile", "write logs to 'logfile' (default stderr)"}, 474 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize, 475 "pagesize", "set the host page size to 'pagesize'"}, 476 {"singlestep", "QEMU_SINGLESTEP", false, handle_arg_singlestep, 477 "", "run in singlestep mode"}, 478 {"strace", "QEMU_STRACE", false, handle_arg_strace, 479 "", "log system calls"}, 480 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed, 481 "", "Seed for pseudo-random number generator"}, 482 {"trace", "QEMU_TRACE", true, handle_arg_trace, 483 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"}, 484 #ifdef CONFIG_PLUGIN 485 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin, 486 "", "[file=]<file>[,<argname>=<argvalue>]"}, 487 #endif 488 {"version", "QEMU_VERSION", false, handle_arg_version, 489 "", "display version information and exit"}, 490 #if defined(TARGET_XTENSA) 491 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0, 492 "", "assume CALL0 Xtensa ABI"}, 493 #endif 494 {NULL, NULL, false, NULL, NULL, NULL} 495 }; 496 497 static void usage(int exitcode) 498 { 499 const struct qemu_argument *arginfo; 500 int maxarglen; 501 int maxenvlen; 502 503 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 504 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n" 505 "\n" 506 "Options and associated environment variables:\n" 507 "\n"); 508 509 /* Calculate column widths. We must always have at least enough space 510 * for the column header. 511 */ 512 maxarglen = strlen("Argument"); 513 maxenvlen = strlen("Env-variable"); 514 515 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 516 int arglen = strlen(arginfo->argv); 517 if (arginfo->has_arg) { 518 arglen += strlen(arginfo->example) + 1; 519 } 520 if (strlen(arginfo->env) > maxenvlen) { 521 maxenvlen = strlen(arginfo->env); 522 } 523 if (arglen > maxarglen) { 524 maxarglen = arglen; 525 } 526 } 527 528 printf("%-*s %-*s Description\n", maxarglen+1, "Argument", 529 maxenvlen, "Env-variable"); 530 531 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 532 if (arginfo->has_arg) { 533 printf("-%s %-*s %-*s %s\n", arginfo->argv, 534 (int)(maxarglen - strlen(arginfo->argv) - 1), 535 arginfo->example, maxenvlen, arginfo->env, arginfo->help); 536 } else { 537 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv, 538 maxenvlen, arginfo->env, 539 arginfo->help); 540 } 541 } 542 543 printf("\n" 544 "Defaults:\n" 545 "QEMU_LD_PREFIX = %s\n" 546 "QEMU_STACK_SIZE = %ld byte\n", 547 interp_prefix, 548 guest_stack_size); 549 550 printf("\n" 551 "You can use -E and -U options or the QEMU_SET_ENV and\n" 552 "QEMU_UNSET_ENV environment variables to set and unset\n" 553 "environment variables for the target process.\n" 554 "It is possible to provide several variables by separating them\n" 555 "by commas in getsubopt(3) style. Additionally it is possible to\n" 556 "provide the -E and -U options multiple times.\n" 557 "The following lines are equivalent:\n" 558 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 559 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n" 560 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n" 561 "Note that if you provide several changes to a single variable\n" 562 "the last change will stay in effect.\n" 563 "\n" 564 QEMU_HELP_BOTTOM "\n"); 565 566 exit(exitcode); 567 } 568 569 static int parse_args(int argc, char **argv) 570 { 571 const char *r; 572 int optind; 573 const struct qemu_argument *arginfo; 574 575 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 576 if (arginfo->env == NULL) { 577 continue; 578 } 579 580 r = getenv(arginfo->env); 581 if (r != NULL) { 582 arginfo->handle_opt(r); 583 } 584 } 585 586 optind = 1; 587 for (;;) { 588 if (optind >= argc) { 589 break; 590 } 591 r = argv[optind]; 592 if (r[0] != '-') { 593 break; 594 } 595 optind++; 596 r++; 597 if (!strcmp(r, "-")) { 598 break; 599 } 600 /* Treat --foo the same as -foo. */ 601 if (r[0] == '-') { 602 r++; 603 } 604 605 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 606 if (!strcmp(r, arginfo->argv)) { 607 if (arginfo->has_arg) { 608 if (optind >= argc) { 609 (void) fprintf(stderr, 610 "qemu: missing argument for option '%s'\n", r); 611 exit(EXIT_FAILURE); 612 } 613 arginfo->handle_opt(argv[optind]); 614 optind++; 615 } else { 616 arginfo->handle_opt(NULL); 617 } 618 break; 619 } 620 } 621 622 /* no option matched the current argv */ 623 if (arginfo->handle_opt == NULL) { 624 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r); 625 exit(EXIT_FAILURE); 626 } 627 } 628 629 if (optind >= argc) { 630 (void) fprintf(stderr, "qemu: no user program specified\n"); 631 exit(EXIT_FAILURE); 632 } 633 634 exec_path = argv[optind]; 635 636 return optind; 637 } 638 639 int main(int argc, char **argv, char **envp) 640 { 641 struct target_pt_regs regs1, *regs = ®s1; 642 struct image_info info1, *info = &info1; 643 struct linux_binprm bprm; 644 TaskState *ts; 645 CPUArchState *env; 646 CPUState *cpu; 647 int optind; 648 char **target_environ, **wrk; 649 char **target_argv; 650 int target_argc; 651 int i; 652 int ret; 653 int execfd; 654 unsigned long max_reserved_va; 655 bool preserve_argv0; 656 657 error_init(argv[0]); 658 module_call_init(MODULE_INIT_TRACE); 659 qemu_init_cpu_list(); 660 module_call_init(MODULE_INIT_QOM); 661 662 envlist = envlist_create(); 663 664 /* add current environment into the list */ 665 for (wrk = environ; *wrk != NULL; wrk++) { 666 (void) envlist_setenv(envlist, *wrk); 667 } 668 669 /* Read the stack limit from the kernel. If it's "unlimited", 670 then we can do little else besides use the default. */ 671 { 672 struct rlimit lim; 673 if (getrlimit(RLIMIT_STACK, &lim) == 0 674 && lim.rlim_cur != RLIM_INFINITY 675 && lim.rlim_cur == (target_long)lim.rlim_cur 676 && lim.rlim_cur > guest_stack_size) { 677 guest_stack_size = lim.rlim_cur; 678 } 679 } 680 681 cpu_model = NULL; 682 683 qemu_add_opts(&qemu_trace_opts); 684 qemu_plugin_add_opts(); 685 686 optind = parse_args(argc, argv); 687 688 qemu_set_log_filename_flags(last_log_filename, 689 last_log_mask | (enable_strace * LOG_STRACE), 690 &error_fatal); 691 692 if (!trace_init_backends()) { 693 exit(1); 694 } 695 trace_init_file(); 696 qemu_plugin_load_list(&plugins, &error_fatal); 697 698 /* Zero out regs */ 699 memset(regs, 0, sizeof(struct target_pt_regs)); 700 701 /* Zero out image_info */ 702 memset(info, 0, sizeof(struct image_info)); 703 704 memset(&bprm, 0, sizeof (bprm)); 705 706 /* Scan interp_prefix dir for replacement files. */ 707 init_paths(interp_prefix); 708 709 init_qemu_uname_release(); 710 711 /* 712 * Manage binfmt-misc open-binary flag 713 */ 714 execfd = qemu_getauxval(AT_EXECFD); 715 if (execfd == 0) { 716 execfd = open(exec_path, O_RDONLY); 717 if (execfd < 0) { 718 printf("Error while loading %s: %s\n", exec_path, strerror(errno)); 719 _exit(EXIT_FAILURE); 720 } 721 } 722 723 /* 724 * get binfmt_misc flags 725 */ 726 preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0); 727 728 /* 729 * Manage binfmt-misc preserve-arg[0] flag 730 * argv[optind] full path to the binary 731 * argv[optind + 1] original argv[0] 732 */ 733 if (optind + 1 < argc && preserve_argv0) { 734 optind++; 735 } 736 737 if (cpu_model == NULL) { 738 cpu_model = cpu_get_model(get_elf_eflags(execfd)); 739 } 740 cpu_type = parse_cpu_option(cpu_model); 741 742 /* init tcg before creating CPUs and to get qemu_host_page_size */ 743 { 744 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 745 746 accel_init_interfaces(ac); 747 ac->init_machine(NULL); 748 } 749 cpu = cpu_create(cpu_type); 750 env = cpu->env_ptr; 751 cpu_reset(cpu); 752 thread_cpu = cpu; 753 754 /* 755 * Reserving too much vm space via mmap can run into problems 756 * with rlimits, oom due to page table creation, etc. We will 757 * still try it, if directed by the command-line option, but 758 * not by default. 759 */ 760 max_reserved_va = MAX_RESERVED_VA(cpu); 761 if (reserved_va != 0) { 762 if (max_reserved_va && reserved_va > max_reserved_va) { 763 fprintf(stderr, "Reserved virtual address too big\n"); 764 exit(EXIT_FAILURE); 765 } 766 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) { 767 /* 768 * reserved_va must be aligned with the host page size 769 * as it is used with mmap() 770 */ 771 reserved_va = max_reserved_va & qemu_host_page_mask; 772 } 773 774 { 775 Error *err = NULL; 776 if (seed_optarg != NULL) { 777 qemu_guest_random_seed_main(seed_optarg, &err); 778 } else { 779 qcrypto_init(&err); 780 } 781 if (err) { 782 error_reportf_err(err, "cannot initialize crypto: "); 783 exit(1); 784 } 785 } 786 787 target_environ = envlist_to_environ(envlist, NULL); 788 envlist_free(envlist); 789 790 /* 791 * Read in mmap_min_addr kernel parameter. This value is used 792 * When loading the ELF image to determine whether guest_base 793 * is needed. It is also used in mmap_find_vma. 794 */ 795 { 796 FILE *fp; 797 798 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) { 799 unsigned long tmp; 800 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) { 801 mmap_min_addr = tmp; 802 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", 803 mmap_min_addr); 804 } 805 fclose(fp); 806 } 807 } 808 809 /* 810 * We prefer to not make NULL pointers accessible to QEMU. 811 * If we're in a chroot with no /proc, fall back to 1 page. 812 */ 813 if (mmap_min_addr == 0) { 814 mmap_min_addr = qemu_host_page_size; 815 qemu_log_mask(CPU_LOG_PAGE, 816 "host mmap_min_addr=0x%lx (fallback)\n", 817 mmap_min_addr); 818 } 819 820 /* 821 * Prepare copy of argv vector for target. 822 */ 823 target_argc = argc - optind; 824 target_argv = calloc(target_argc + 1, sizeof (char *)); 825 if (target_argv == NULL) { 826 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n"); 827 exit(EXIT_FAILURE); 828 } 829 830 /* 831 * If argv0 is specified (using '-0' switch) we replace 832 * argv[0] pointer with the given one. 833 */ 834 i = 0; 835 if (argv0 != NULL) { 836 target_argv[i++] = strdup(argv0); 837 } 838 for (; i < target_argc; i++) { 839 target_argv[i] = strdup(argv[optind + i]); 840 } 841 target_argv[target_argc] = NULL; 842 843 ts = g_new0(TaskState, 1); 844 init_task_state(ts); 845 /* build Task State */ 846 ts->info = info; 847 ts->bprm = &bprm; 848 cpu->opaque = ts; 849 task_settid(ts); 850 851 fd_trans_init(); 852 853 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs, 854 info, &bprm); 855 if (ret != 0) { 856 printf("Error while loading %s: %s\n", exec_path, strerror(-ret)); 857 _exit(EXIT_FAILURE); 858 } 859 860 for (wrk = target_environ; *wrk; wrk++) { 861 g_free(*wrk); 862 } 863 864 g_free(target_environ); 865 866 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 867 FILE *f = qemu_log_trylock(); 868 if (f) { 869 fprintf(f, "guest_base %p\n", (void *)guest_base); 870 fprintf(f, "page layout changed following binary load\n"); 871 page_dump(f); 872 873 fprintf(f, "start_brk 0x" TARGET_ABI_FMT_lx "\n", 874 info->start_brk); 875 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", 876 info->end_code); 877 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", 878 info->start_code); 879 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", 880 info->start_data); 881 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", 882 info->end_data); 883 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", 884 info->start_stack); 885 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", 886 info->brk); 887 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", 888 info->entry); 889 fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n", 890 info->argv); 891 fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n", 892 info->envp); 893 fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n", 894 info->saved_auxv); 895 qemu_log_unlock(f); 896 } 897 } 898 899 target_set_brk(info->brk); 900 syscall_init(); 901 signal_init(); 902 903 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay 904 generating the prologue until now so that the prologue can take 905 the real value of GUEST_BASE into account. */ 906 tcg_prologue_init(tcg_ctx); 907 908 target_cpu_copy_regs(env, regs); 909 910 if (gdbstub) { 911 if (gdbserver_start(gdbstub) < 0) { 912 fprintf(stderr, "qemu: could not open gdbserver on %s\n", 913 gdbstub); 914 exit(EXIT_FAILURE); 915 } 916 gdb_handlesig(cpu, 0); 917 } 918 919 #ifdef CONFIG_SEMIHOSTING 920 qemu_semihosting_guestfd_init(); 921 #endif 922 923 cpu_loop(env); 924 /* never exits */ 925 return 0; 926 } 927