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 #include "accel/tcg/perf.h" 57 58 #ifdef CONFIG_SEMIHOSTING 59 #include "semihosting/semihost.h" 60 #endif 61 62 #ifndef AT_FLAGS_PRESERVE_ARGV0 63 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0 64 #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT) 65 #endif 66 67 char *exec_path; 68 char real_exec_path[PATH_MAX]; 69 70 int singlestep; 71 static const char *argv0; 72 static const char *gdbstub; 73 static envlist_t *envlist; 74 static const char *cpu_model; 75 static const char *cpu_type; 76 static const char *seed_optarg; 77 unsigned long mmap_min_addr; 78 uintptr_t guest_base; 79 bool have_guest_base; 80 81 /* 82 * Used to implement backwards-compatibility for the `-strace`, and 83 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by 84 * -strace, or vice versa. 85 */ 86 static bool enable_strace; 87 88 /* 89 * The last log mask given by the user in an environment variable or argument. 90 * Used to support command line arguments overriding environment variables. 91 */ 92 static int last_log_mask; 93 static const char *last_log_filename; 94 95 /* 96 * When running 32-on-64 we should make sure we can fit all of the possible 97 * guest address space into a contiguous chunk of virtual host memory. 98 * 99 * This way we will never overlap with our own libraries or binaries or stack 100 * or anything else that QEMU maps. 101 * 102 * Many cpus reserve the high bit (or more than one for some 64-bit cpus) 103 * of the address for the kernel. Some cpus rely on this and user space 104 * uses the high bit(s) for pointer tagging and the like. For them, we 105 * must preserve the expected address space. 106 */ 107 #ifndef MAX_RESERVED_VA 108 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS 109 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ 110 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) 111 /* There are a number of places where we assign reserved_va to a variable 112 of type abi_ulong and expect it to fit. Avoid the last page. */ 113 # define MAX_RESERVED_VA(CPU) (0xfffffffful & TARGET_PAGE_MASK) 114 # else 115 # define MAX_RESERVED_VA(CPU) (1ul << TARGET_VIRT_ADDR_SPACE_BITS) 116 # endif 117 # else 118 # define MAX_RESERVED_VA(CPU) 0 119 # endif 120 #endif 121 122 unsigned long reserved_va; 123 124 static void usage(int exitcode); 125 126 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; 127 const char *qemu_uname_release; 128 129 #if !defined(TARGET_DEFAULT_STACK_SIZE) 130 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so 131 we allocate a bigger stack. Need a better solution, for example 132 by remapping the process stack directly at the right place */ 133 #define TARGET_DEFAULT_STACK_SIZE 8 * 1024 * 1024UL 134 #endif 135 136 unsigned long guest_stack_size = TARGET_DEFAULT_STACK_SIZE; 137 138 /***********************************************************/ 139 /* Helper routines for implementing atomic operations. */ 140 141 /* Make sure everything is in a consistent state for calling fork(). */ 142 void fork_start(void) 143 { 144 start_exclusive(); 145 mmap_fork_start(); 146 cpu_list_lock(); 147 qemu_plugin_user_prefork_lock(); 148 } 149 150 void fork_end(int child) 151 { 152 qemu_plugin_user_postfork(child); 153 mmap_fork_end(child); 154 if (child) { 155 CPUState *cpu, *next_cpu; 156 /* Child processes created by fork() only have a single thread. 157 Discard information about the parent threads. */ 158 CPU_FOREACH_SAFE(cpu, next_cpu) { 159 if (cpu != thread_cpu) { 160 QTAILQ_REMOVE_RCU(&cpus, cpu, node); 161 } 162 } 163 qemu_init_cpu_list(); 164 gdbserver_fork(thread_cpu); 165 } else { 166 cpu_list_unlock(); 167 } 168 /* 169 * qemu_init_cpu_list() reinitialized the child exclusive state, but we 170 * also need to keep current_cpu consistent, so call end_exclusive() for 171 * both child and parent. 172 */ 173 end_exclusive(); 174 } 175 176 __thread CPUState *thread_cpu; 177 178 bool qemu_cpu_is_self(CPUState *cpu) 179 { 180 return thread_cpu == cpu; 181 } 182 183 void qemu_cpu_kick(CPUState *cpu) 184 { 185 cpu_exit(cpu); 186 } 187 188 void task_settid(TaskState *ts) 189 { 190 if (ts->ts_tid == 0) { 191 ts->ts_tid = (pid_t)syscall(SYS_gettid); 192 } 193 } 194 195 void stop_all_tasks(void) 196 { 197 /* 198 * We trust that when using NPTL, start_exclusive() 199 * handles thread stopping correctly. 200 */ 201 start_exclusive(); 202 } 203 204 /* Assumes contents are already zeroed. */ 205 void init_task_state(TaskState *ts) 206 { 207 long ticks_per_sec; 208 struct timespec bt; 209 210 ts->used = 1; 211 ts->sigaltstack_used = (struct target_sigaltstack) { 212 .ss_sp = 0, 213 .ss_size = 0, 214 .ss_flags = TARGET_SS_DISABLE, 215 }; 216 217 /* Capture task start time relative to system boot */ 218 219 ticks_per_sec = sysconf(_SC_CLK_TCK); 220 221 if ((ticks_per_sec > 0) && !clock_gettime(CLOCK_BOOTTIME, &bt)) { 222 /* start_boottime is expressed in clock ticks */ 223 ts->start_boottime = bt.tv_sec * (uint64_t) ticks_per_sec; 224 ts->start_boottime += bt.tv_nsec * (uint64_t) ticks_per_sec / 225 NANOSECONDS_PER_SECOND; 226 } 227 } 228 229 CPUArchState *cpu_copy(CPUArchState *env) 230 { 231 CPUState *cpu = env_cpu(env); 232 CPUState *new_cpu = cpu_create(cpu_type); 233 CPUArchState *new_env = new_cpu->env_ptr; 234 CPUBreakpoint *bp; 235 236 /* Reset non arch specific state */ 237 cpu_reset(new_cpu); 238 239 new_cpu->tcg_cflags = cpu->tcg_cflags; 240 memcpy(new_env, env, sizeof(CPUArchState)); 241 #if defined(TARGET_I386) || defined(TARGET_X86_64) 242 new_env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES, 243 PROT_READ | PROT_WRITE, 244 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); 245 memcpy(g2h_untagged(new_env->gdt.base), g2h_untagged(env->gdt.base), 246 sizeof(uint64_t) * TARGET_GDT_ENTRIES); 247 OBJECT(new_cpu)->free = OBJECT(cpu)->free; 248 #endif 249 250 /* Clone all break/watchpoints. 251 Note: Once we support ptrace with hw-debug register access, make sure 252 BP_CPU break/watchpoints are handled correctly on clone. */ 253 QTAILQ_INIT(&new_cpu->breakpoints); 254 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) { 255 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL); 256 } 257 258 return new_env; 259 } 260 261 static void handle_arg_help(const char *arg) 262 { 263 usage(EXIT_SUCCESS); 264 } 265 266 static void handle_arg_log(const char *arg) 267 { 268 last_log_mask = qemu_str_to_log_mask(arg); 269 if (!last_log_mask) { 270 qemu_print_log_usage(stdout); 271 exit(EXIT_FAILURE); 272 } 273 } 274 275 static void handle_arg_dfilter(const char *arg) 276 { 277 qemu_set_dfilter_ranges(arg, &error_fatal); 278 } 279 280 static void handle_arg_log_filename(const char *arg) 281 { 282 last_log_filename = arg; 283 } 284 285 static void handle_arg_set_env(const char *arg) 286 { 287 char *r, *p, *token; 288 r = p = strdup(arg); 289 while ((token = strsep(&p, ",")) != NULL) { 290 if (envlist_setenv(envlist, token) != 0) { 291 usage(EXIT_FAILURE); 292 } 293 } 294 free(r); 295 } 296 297 static void handle_arg_unset_env(const char *arg) 298 { 299 char *r, *p, *token; 300 r = p = strdup(arg); 301 while ((token = strsep(&p, ",")) != NULL) { 302 if (envlist_unsetenv(envlist, token) != 0) { 303 usage(EXIT_FAILURE); 304 } 305 } 306 free(r); 307 } 308 309 static void handle_arg_argv0(const char *arg) 310 { 311 argv0 = strdup(arg); 312 } 313 314 static void handle_arg_stack_size(const char *arg) 315 { 316 char *p; 317 guest_stack_size = strtoul(arg, &p, 0); 318 if (guest_stack_size == 0) { 319 usage(EXIT_FAILURE); 320 } 321 322 if (*p == 'M') { 323 guest_stack_size *= MiB; 324 } else if (*p == 'k' || *p == 'K') { 325 guest_stack_size *= KiB; 326 } 327 } 328 329 static void handle_arg_ld_prefix(const char *arg) 330 { 331 interp_prefix = strdup(arg); 332 } 333 334 static void handle_arg_pagesize(const char *arg) 335 { 336 qemu_host_page_size = atoi(arg); 337 if (qemu_host_page_size == 0 || 338 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 339 fprintf(stderr, "page size must be a power of two\n"); 340 exit(EXIT_FAILURE); 341 } 342 } 343 344 static void handle_arg_seed(const char *arg) 345 { 346 seed_optarg = arg; 347 } 348 349 static void handle_arg_gdb(const char *arg) 350 { 351 gdbstub = g_strdup(arg); 352 } 353 354 static void handle_arg_uname(const char *arg) 355 { 356 qemu_uname_release = strdup(arg); 357 } 358 359 static void handle_arg_cpu(const char *arg) 360 { 361 cpu_model = strdup(arg); 362 if (cpu_model == NULL || is_help_option(cpu_model)) { 363 /* XXX: implement xxx_cpu_list for targets that still miss it */ 364 #if defined(cpu_list) 365 cpu_list(); 366 #endif 367 exit(EXIT_FAILURE); 368 } 369 } 370 371 static void handle_arg_guest_base(const char *arg) 372 { 373 guest_base = strtol(arg, NULL, 0); 374 have_guest_base = true; 375 } 376 377 static void handle_arg_reserved_va(const char *arg) 378 { 379 char *p; 380 int shift = 0; 381 reserved_va = strtoul(arg, &p, 0); 382 switch (*p) { 383 case 'k': 384 case 'K': 385 shift = 10; 386 break; 387 case 'M': 388 shift = 20; 389 break; 390 case 'G': 391 shift = 30; 392 break; 393 } 394 if (shift) { 395 unsigned long unshifted = reserved_va; 396 p++; 397 reserved_va <<= shift; 398 if (reserved_va >> shift != unshifted) { 399 fprintf(stderr, "Reserved virtual address too big\n"); 400 exit(EXIT_FAILURE); 401 } 402 } 403 if (*p) { 404 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p); 405 exit(EXIT_FAILURE); 406 } 407 } 408 409 static void handle_arg_singlestep(const char *arg) 410 { 411 singlestep = 1; 412 } 413 414 static void handle_arg_strace(const char *arg) 415 { 416 enable_strace = true; 417 } 418 419 static void handle_arg_version(const char *arg) 420 { 421 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 422 "\n" QEMU_COPYRIGHT "\n"); 423 exit(EXIT_SUCCESS); 424 } 425 426 static void handle_arg_trace(const char *arg) 427 { 428 trace_opt_parse(arg); 429 } 430 431 #if defined(TARGET_XTENSA) 432 static void handle_arg_abi_call0(const char *arg) 433 { 434 xtensa_set_abi_call0(); 435 } 436 #endif 437 438 static void handle_arg_perfmap(const char *arg) 439 { 440 perf_enable_perfmap(); 441 } 442 443 static void handle_arg_jitdump(const char *arg) 444 { 445 perf_enable_jitdump(); 446 } 447 448 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins); 449 450 #ifdef CONFIG_PLUGIN 451 static void handle_arg_plugin(const char *arg) 452 { 453 qemu_plugin_opt_parse(arg, &plugins); 454 } 455 #endif 456 457 struct qemu_argument { 458 const char *argv; 459 const char *env; 460 bool has_arg; 461 void (*handle_opt)(const char *arg); 462 const char *example; 463 const char *help; 464 }; 465 466 static const struct qemu_argument arg_table[] = { 467 {"h", "", false, handle_arg_help, 468 "", "print this help"}, 469 {"help", "", false, handle_arg_help, 470 "", ""}, 471 {"g", "QEMU_GDB", true, handle_arg_gdb, 472 "port", "wait gdb connection to 'port'"}, 473 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix, 474 "path", "set the elf interpreter prefix to 'path'"}, 475 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size, 476 "size", "set the stack size to 'size' bytes"}, 477 {"cpu", "QEMU_CPU", true, handle_arg_cpu, 478 "model", "select CPU (-cpu help for list)"}, 479 {"E", "QEMU_SET_ENV", true, handle_arg_set_env, 480 "var=value", "sets targets environment variable (see below)"}, 481 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env, 482 "var", "unsets targets environment variable (see below)"}, 483 {"0", "QEMU_ARGV0", true, handle_arg_argv0, 484 "argv0", "forces target process argv[0] to be 'argv0'"}, 485 {"r", "QEMU_UNAME", true, handle_arg_uname, 486 "uname", "set qemu uname release string to 'uname'"}, 487 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base, 488 "address", "set guest_base address to 'address'"}, 489 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va, 490 "size", "reserve 'size' bytes for guest virtual address space"}, 491 {"d", "QEMU_LOG", true, handle_arg_log, 492 "item[,...]", "enable logging of specified items " 493 "(use '-d help' for a list of items)"}, 494 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter, 495 "range[,...]","filter logging based on address range"}, 496 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename, 497 "logfile", "write logs to 'logfile' (default stderr)"}, 498 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize, 499 "pagesize", "set the host page size to 'pagesize'"}, 500 {"singlestep", "QEMU_SINGLESTEP", false, handle_arg_singlestep, 501 "", "run in singlestep mode"}, 502 {"strace", "QEMU_STRACE", false, handle_arg_strace, 503 "", "log system calls"}, 504 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed, 505 "", "Seed for pseudo-random number generator"}, 506 {"trace", "QEMU_TRACE", true, handle_arg_trace, 507 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"}, 508 #ifdef CONFIG_PLUGIN 509 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin, 510 "", "[file=]<file>[,<argname>=<argvalue>]"}, 511 #endif 512 {"version", "QEMU_VERSION", false, handle_arg_version, 513 "", "display version information and exit"}, 514 #if defined(TARGET_XTENSA) 515 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0, 516 "", "assume CALL0 Xtensa ABI"}, 517 #endif 518 {"perfmap", "QEMU_PERFMAP", false, handle_arg_perfmap, 519 "", "Generate a /tmp/perf-${pid}.map file for perf"}, 520 {"jitdump", "QEMU_JITDUMP", false, handle_arg_jitdump, 521 "", "Generate a jit-${pid}.dump file for perf"}, 522 {NULL, NULL, false, NULL, NULL, NULL} 523 }; 524 525 static void usage(int exitcode) 526 { 527 const struct qemu_argument *arginfo; 528 int maxarglen; 529 int maxenvlen; 530 531 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 532 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n" 533 "\n" 534 "Options and associated environment variables:\n" 535 "\n"); 536 537 /* Calculate column widths. We must always have at least enough space 538 * for the column header. 539 */ 540 maxarglen = strlen("Argument"); 541 maxenvlen = strlen("Env-variable"); 542 543 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 544 int arglen = strlen(arginfo->argv); 545 if (arginfo->has_arg) { 546 arglen += strlen(arginfo->example) + 1; 547 } 548 if (strlen(arginfo->env) > maxenvlen) { 549 maxenvlen = strlen(arginfo->env); 550 } 551 if (arglen > maxarglen) { 552 maxarglen = arglen; 553 } 554 } 555 556 printf("%-*s %-*s Description\n", maxarglen+1, "Argument", 557 maxenvlen, "Env-variable"); 558 559 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 560 if (arginfo->has_arg) { 561 printf("-%s %-*s %-*s %s\n", arginfo->argv, 562 (int)(maxarglen - strlen(arginfo->argv) - 1), 563 arginfo->example, maxenvlen, arginfo->env, arginfo->help); 564 } else { 565 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv, 566 maxenvlen, arginfo->env, 567 arginfo->help); 568 } 569 } 570 571 printf("\n" 572 "Defaults:\n" 573 "QEMU_LD_PREFIX = %s\n" 574 "QEMU_STACK_SIZE = %ld byte\n", 575 interp_prefix, 576 guest_stack_size); 577 578 printf("\n" 579 "You can use -E and -U options or the QEMU_SET_ENV and\n" 580 "QEMU_UNSET_ENV environment variables to set and unset\n" 581 "environment variables for the target process.\n" 582 "It is possible to provide several variables by separating them\n" 583 "by commas in getsubopt(3) style. Additionally it is possible to\n" 584 "provide the -E and -U options multiple times.\n" 585 "The following lines are equivalent:\n" 586 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 587 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n" 588 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n" 589 "Note that if you provide several changes to a single variable\n" 590 "the last change will stay in effect.\n" 591 "\n" 592 QEMU_HELP_BOTTOM "\n"); 593 594 exit(exitcode); 595 } 596 597 static int parse_args(int argc, char **argv) 598 { 599 const char *r; 600 int optind; 601 const struct qemu_argument *arginfo; 602 603 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 604 if (arginfo->env == NULL) { 605 continue; 606 } 607 608 r = getenv(arginfo->env); 609 if (r != NULL) { 610 arginfo->handle_opt(r); 611 } 612 } 613 614 optind = 1; 615 for (;;) { 616 if (optind >= argc) { 617 break; 618 } 619 r = argv[optind]; 620 if (r[0] != '-') { 621 break; 622 } 623 optind++; 624 r++; 625 if (!strcmp(r, "-")) { 626 break; 627 } 628 /* Treat --foo the same as -foo. */ 629 if (r[0] == '-') { 630 r++; 631 } 632 633 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 634 if (!strcmp(r, arginfo->argv)) { 635 if (arginfo->has_arg) { 636 if (optind >= argc) { 637 (void) fprintf(stderr, 638 "qemu: missing argument for option '%s'\n", r); 639 exit(EXIT_FAILURE); 640 } 641 arginfo->handle_opt(argv[optind]); 642 optind++; 643 } else { 644 arginfo->handle_opt(NULL); 645 } 646 break; 647 } 648 } 649 650 /* no option matched the current argv */ 651 if (arginfo->handle_opt == NULL) { 652 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r); 653 exit(EXIT_FAILURE); 654 } 655 } 656 657 if (optind >= argc) { 658 (void) fprintf(stderr, "qemu: no user program specified\n"); 659 exit(EXIT_FAILURE); 660 } 661 662 exec_path = argv[optind]; 663 664 return optind; 665 } 666 667 int main(int argc, char **argv, char **envp) 668 { 669 struct target_pt_regs regs1, *regs = ®s1; 670 struct image_info info1, *info = &info1; 671 struct linux_binprm bprm; 672 TaskState *ts; 673 CPUArchState *env; 674 CPUState *cpu; 675 int optind; 676 char **target_environ, **wrk; 677 char **target_argv; 678 int target_argc; 679 int i; 680 int ret; 681 int execfd; 682 unsigned long max_reserved_va; 683 bool preserve_argv0; 684 685 error_init(argv[0]); 686 module_call_init(MODULE_INIT_TRACE); 687 qemu_init_cpu_list(); 688 module_call_init(MODULE_INIT_QOM); 689 690 envlist = envlist_create(); 691 692 /* add current environment into the list */ 693 for (wrk = environ; *wrk != NULL; wrk++) { 694 (void) envlist_setenv(envlist, *wrk); 695 } 696 697 /* Read the stack limit from the kernel. If it's "unlimited", 698 then we can do little else besides use the default. */ 699 { 700 struct rlimit lim; 701 if (getrlimit(RLIMIT_STACK, &lim) == 0 702 && lim.rlim_cur != RLIM_INFINITY 703 && lim.rlim_cur == (target_long)lim.rlim_cur 704 && lim.rlim_cur > guest_stack_size) { 705 guest_stack_size = lim.rlim_cur; 706 } 707 } 708 709 cpu_model = NULL; 710 711 qemu_add_opts(&qemu_trace_opts); 712 qemu_plugin_add_opts(); 713 714 optind = parse_args(argc, argv); 715 716 qemu_set_log_filename_flags(last_log_filename, 717 last_log_mask | (enable_strace * LOG_STRACE), 718 &error_fatal); 719 720 if (!trace_init_backends()) { 721 exit(1); 722 } 723 trace_init_file(); 724 qemu_plugin_load_list(&plugins, &error_fatal); 725 726 /* Zero out regs */ 727 memset(regs, 0, sizeof(struct target_pt_regs)); 728 729 /* Zero out image_info */ 730 memset(info, 0, sizeof(struct image_info)); 731 732 memset(&bprm, 0, sizeof (bprm)); 733 734 /* Scan interp_prefix dir for replacement files. */ 735 init_paths(interp_prefix); 736 737 init_qemu_uname_release(); 738 739 /* 740 * Manage binfmt-misc open-binary flag 741 */ 742 execfd = qemu_getauxval(AT_EXECFD); 743 if (execfd == 0) { 744 execfd = open(exec_path, O_RDONLY); 745 if (execfd < 0) { 746 printf("Error while loading %s: %s\n", exec_path, strerror(errno)); 747 _exit(EXIT_FAILURE); 748 } 749 } 750 751 /* Resolve executable file name to full path name */ 752 if (realpath(exec_path, real_exec_path)) { 753 exec_path = real_exec_path; 754 } 755 756 /* 757 * get binfmt_misc flags 758 */ 759 preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0); 760 761 /* 762 * Manage binfmt-misc preserve-arg[0] flag 763 * argv[optind] full path to the binary 764 * argv[optind + 1] original argv[0] 765 */ 766 if (optind + 1 < argc && preserve_argv0) { 767 optind++; 768 } 769 770 if (cpu_model == NULL) { 771 cpu_model = cpu_get_model(get_elf_eflags(execfd)); 772 } 773 cpu_type = parse_cpu_option(cpu_model); 774 775 /* init tcg before creating CPUs and to get qemu_host_page_size */ 776 { 777 AccelClass *ac = ACCEL_GET_CLASS(current_accel()); 778 779 accel_init_interfaces(ac); 780 ac->init_machine(NULL); 781 } 782 cpu = cpu_create(cpu_type); 783 env = cpu->env_ptr; 784 cpu_reset(cpu); 785 thread_cpu = cpu; 786 787 /* 788 * Reserving too much vm space via mmap can run into problems 789 * with rlimits, oom due to page table creation, etc. We will 790 * still try it, if directed by the command-line option, but 791 * not by default. 792 */ 793 max_reserved_va = MAX_RESERVED_VA(cpu); 794 if (reserved_va != 0) { 795 if (max_reserved_va && reserved_va > max_reserved_va) { 796 fprintf(stderr, "Reserved virtual address too big\n"); 797 exit(EXIT_FAILURE); 798 } 799 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) { 800 /* 801 * reserved_va must be aligned with the host page size 802 * as it is used with mmap() 803 */ 804 reserved_va = max_reserved_va & qemu_host_page_mask; 805 } 806 807 { 808 Error *err = NULL; 809 if (seed_optarg != NULL) { 810 qemu_guest_random_seed_main(seed_optarg, &err); 811 } else { 812 qcrypto_init(&err); 813 } 814 if (err) { 815 error_reportf_err(err, "cannot initialize crypto: "); 816 exit(1); 817 } 818 } 819 820 target_environ = envlist_to_environ(envlist, NULL); 821 envlist_free(envlist); 822 823 /* 824 * Read in mmap_min_addr kernel parameter. This value is used 825 * When loading the ELF image to determine whether guest_base 826 * is needed. It is also used in mmap_find_vma. 827 */ 828 { 829 FILE *fp; 830 831 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) { 832 unsigned long tmp; 833 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) { 834 mmap_min_addr = tmp; 835 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", 836 mmap_min_addr); 837 } 838 fclose(fp); 839 } 840 } 841 842 /* 843 * We prefer to not make NULL pointers accessible to QEMU. 844 * If we're in a chroot with no /proc, fall back to 1 page. 845 */ 846 if (mmap_min_addr == 0) { 847 mmap_min_addr = qemu_host_page_size; 848 qemu_log_mask(CPU_LOG_PAGE, 849 "host mmap_min_addr=0x%lx (fallback)\n", 850 mmap_min_addr); 851 } 852 853 /* 854 * Prepare copy of argv vector for target. 855 */ 856 target_argc = argc - optind; 857 target_argv = calloc(target_argc + 1, sizeof (char *)); 858 if (target_argv == NULL) { 859 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n"); 860 exit(EXIT_FAILURE); 861 } 862 863 /* 864 * If argv0 is specified (using '-0' switch) we replace 865 * argv[0] pointer with the given one. 866 */ 867 i = 0; 868 if (argv0 != NULL) { 869 target_argv[i++] = strdup(argv0); 870 } 871 for (; i < target_argc; i++) { 872 target_argv[i] = strdup(argv[optind + i]); 873 } 874 target_argv[target_argc] = NULL; 875 876 ts = g_new0(TaskState, 1); 877 init_task_state(ts); 878 /* build Task State */ 879 ts->info = info; 880 ts->bprm = &bprm; 881 cpu->opaque = ts; 882 task_settid(ts); 883 884 fd_trans_init(); 885 886 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs, 887 info, &bprm); 888 if (ret != 0) { 889 printf("Error while loading %s: %s\n", exec_path, strerror(-ret)); 890 _exit(EXIT_FAILURE); 891 } 892 893 for (wrk = target_environ; *wrk; wrk++) { 894 g_free(*wrk); 895 } 896 897 g_free(target_environ); 898 899 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 900 FILE *f = qemu_log_trylock(); 901 if (f) { 902 fprintf(f, "guest_base %p\n", (void *)guest_base); 903 fprintf(f, "page layout changed following binary load\n"); 904 page_dump(f); 905 906 fprintf(f, "start_brk 0x" TARGET_ABI_FMT_lx "\n", 907 info->start_brk); 908 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", 909 info->end_code); 910 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", 911 info->start_code); 912 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", 913 info->start_data); 914 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", 915 info->end_data); 916 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", 917 info->start_stack); 918 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", 919 info->brk); 920 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", 921 info->entry); 922 fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n", 923 info->argv); 924 fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n", 925 info->envp); 926 fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n", 927 info->saved_auxv); 928 qemu_log_unlock(f); 929 } 930 } 931 932 target_set_brk(info->brk); 933 syscall_init(); 934 signal_init(); 935 936 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay 937 generating the prologue until now so that the prologue can take 938 the real value of GUEST_BASE into account. */ 939 tcg_prologue_init(tcg_ctx); 940 941 target_cpu_copy_regs(env, regs); 942 943 if (gdbstub) { 944 if (gdbserver_start(gdbstub) < 0) { 945 fprintf(stderr, "qemu: could not open gdbserver on %s\n", 946 gdbstub); 947 exit(EXIT_FAILURE); 948 } 949 gdb_handlesig(cpu, 0); 950 } 951 952 #ifdef CONFIG_SEMIHOSTING 953 qemu_semihosting_guestfd_init(); 954 #endif 955 956 cpu_loop(env); 957 /* never exits */ 958 return 0; 959 } 960