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 "gdbstub/user.h" 44 #include "tcg/tcg.h" 45 #include "qemu/timer.h" 46 #include "qemu/envlist.h" 47 #include "qemu/guest-random.h" 48 #include "elf.h" 49 #include "trace/control.h" 50 #include "target_elf.h" 51 #include "cpu_loop-common.h" 52 #include "crypto/init.h" 53 #include "fd-trans.h" 54 #include "signal-common.h" 55 #include "loader.h" 56 #include "user-mmap.h" 57 #include "accel/tcg/perf.h" 58 59 #ifdef CONFIG_SEMIHOSTING 60 #include "semihosting/semihost.h" 61 #endif 62 63 #ifndef AT_FLAGS_PRESERVE_ARGV0 64 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0 65 #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT) 66 #endif 67 68 char *exec_path; 69 char real_exec_path[PATH_MAX]; 70 71 int singlestep; 72 static const char *argv0; 73 static const char *gdbstub; 74 static envlist_t *envlist; 75 static const char *cpu_model; 76 static const char *cpu_type; 77 static const char *seed_optarg; 78 unsigned long mmap_min_addr; 79 uintptr_t guest_base; 80 bool have_guest_base; 81 82 /* 83 * Used to implement backwards-compatibility for the `-strace`, and 84 * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by 85 * -strace, or vice versa. 86 */ 87 static bool enable_strace; 88 89 /* 90 * The last log mask given by the user in an environment variable or argument. 91 * Used to support command line arguments overriding environment variables. 92 */ 93 static int last_log_mask; 94 static const char *last_log_filename; 95 96 /* 97 * When running 32-on-64 we should make sure we can fit all of the possible 98 * guest address space into a contiguous chunk of virtual host memory. 99 * 100 * This way we will never overlap with our own libraries or binaries or stack 101 * or anything else that QEMU maps. 102 * 103 * Many cpus reserve the high bit (or more than one for some 64-bit cpus) 104 * of the address for the kernel. Some cpus rely on this and user space 105 * uses the high bit(s) for pointer tagging and the like. For them, we 106 * must preserve the expected address space. 107 */ 108 #ifndef MAX_RESERVED_VA 109 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS 110 # if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \ 111 (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32)) 112 # define MAX_RESERVED_VA(CPU) 0xfffffffful 113 # else 114 # define MAX_RESERVED_VA(CPU) ((1ul << TARGET_VIRT_ADDR_SPACE_BITS) - 1) 115 # endif 116 # else 117 # define MAX_RESERVED_VA(CPU) 0 118 # endif 119 #endif 120 121 unsigned long reserved_va; 122 123 static void usage(int exitcode); 124 125 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX; 126 const char *qemu_uname_release; 127 128 #if !defined(TARGET_DEFAULT_STACK_SIZE) 129 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so 130 we allocate a bigger stack. Need a better solution, for example 131 by remapping the process stack directly at the right place */ 132 #define TARGET_DEFAULT_STACK_SIZE 8 * 1024 * 1024UL 133 #endif 134 135 unsigned long guest_stack_size = TARGET_DEFAULT_STACK_SIZE; 136 137 /***********************************************************/ 138 /* Helper routines for implementing atomic operations. */ 139 140 /* Make sure everything is in a consistent state for calling fork(). */ 141 void fork_start(void) 142 { 143 start_exclusive(); 144 mmap_fork_start(); 145 cpu_list_lock(); 146 qemu_plugin_user_prefork_lock(); 147 } 148 149 void fork_end(int child) 150 { 151 qemu_plugin_user_postfork(child); 152 mmap_fork_end(child); 153 if (child) { 154 CPUState *cpu, *next_cpu; 155 /* Child processes created by fork() only have a single thread. 156 Discard information about the parent threads. */ 157 CPU_FOREACH_SAFE(cpu, next_cpu) { 158 if (cpu != thread_cpu) { 159 QTAILQ_REMOVE_RCU(&cpus, cpu, node); 160 } 161 } 162 qemu_init_cpu_list(); 163 gdbserver_fork(thread_cpu); 164 } else { 165 cpu_list_unlock(); 166 } 167 /* 168 * qemu_init_cpu_list() reinitialized the child exclusive state, but we 169 * also need to keep current_cpu consistent, so call end_exclusive() for 170 * both child and parent. 171 */ 172 end_exclusive(); 173 } 174 175 __thread CPUState *thread_cpu; 176 177 bool qemu_cpu_is_self(CPUState *cpu) 178 { 179 return thread_cpu == cpu; 180 } 181 182 void qemu_cpu_kick(CPUState *cpu) 183 { 184 cpu_exit(cpu); 185 } 186 187 void task_settid(TaskState *ts) 188 { 189 if (ts->ts_tid == 0) { 190 ts->ts_tid = (pid_t)syscall(SYS_gettid); 191 } 192 } 193 194 void stop_all_tasks(void) 195 { 196 /* 197 * We trust that when using NPTL, start_exclusive() 198 * handles thread stopping correctly. 199 */ 200 start_exclusive(); 201 } 202 203 /* Assumes contents are already zeroed. */ 204 void init_task_state(TaskState *ts) 205 { 206 long ticks_per_sec; 207 struct timespec bt; 208 209 ts->used = 1; 210 ts->sigaltstack_used = (struct target_sigaltstack) { 211 .ss_sp = 0, 212 .ss_size = 0, 213 .ss_flags = TARGET_SS_DISABLE, 214 }; 215 216 /* Capture task start time relative to system boot */ 217 218 ticks_per_sec = sysconf(_SC_CLK_TCK); 219 220 if ((ticks_per_sec > 0) && !clock_gettime(CLOCK_BOOTTIME, &bt)) { 221 /* start_boottime is expressed in clock ticks */ 222 ts->start_boottime = bt.tv_sec * (uint64_t) ticks_per_sec; 223 ts->start_boottime += bt.tv_nsec * (uint64_t) ticks_per_sec / 224 NANOSECONDS_PER_SECOND; 225 } 226 } 227 228 CPUArchState *cpu_copy(CPUArchState *env) 229 { 230 CPUState *cpu = env_cpu(env); 231 CPUState *new_cpu = cpu_create(cpu_type); 232 CPUArchState *new_env = new_cpu->env_ptr; 233 CPUBreakpoint *bp; 234 235 /* Reset non arch specific state */ 236 cpu_reset(new_cpu); 237 238 new_cpu->tcg_cflags = cpu->tcg_cflags; 239 memcpy(new_env, env, sizeof(CPUArchState)); 240 #if defined(TARGET_I386) || defined(TARGET_X86_64) 241 new_env->gdt.base = target_mmap(0, sizeof(uint64_t) * TARGET_GDT_ENTRIES, 242 PROT_READ | PROT_WRITE, 243 MAP_ANONYMOUS | MAP_PRIVATE, -1, 0); 244 memcpy(g2h_untagged(new_env->gdt.base), g2h_untagged(env->gdt.base), 245 sizeof(uint64_t) * TARGET_GDT_ENTRIES); 246 OBJECT(new_cpu)->free = OBJECT(cpu)->free; 247 #endif 248 249 /* Clone all break/watchpoints. 250 Note: Once we support ptrace with hw-debug register access, make sure 251 BP_CPU break/watchpoints are handled correctly on clone. */ 252 QTAILQ_INIT(&new_cpu->breakpoints); 253 QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) { 254 cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL); 255 } 256 257 return new_env; 258 } 259 260 static void handle_arg_help(const char *arg) 261 { 262 usage(EXIT_SUCCESS); 263 } 264 265 static void handle_arg_log(const char *arg) 266 { 267 last_log_mask = qemu_str_to_log_mask(arg); 268 if (!last_log_mask) { 269 qemu_print_log_usage(stdout); 270 exit(EXIT_FAILURE); 271 } 272 } 273 274 static void handle_arg_dfilter(const char *arg) 275 { 276 qemu_set_dfilter_ranges(arg, &error_fatal); 277 } 278 279 static void handle_arg_log_filename(const char *arg) 280 { 281 last_log_filename = arg; 282 } 283 284 static void handle_arg_set_env(const char *arg) 285 { 286 char *r, *p, *token; 287 r = p = strdup(arg); 288 while ((token = strsep(&p, ",")) != NULL) { 289 if (envlist_setenv(envlist, token) != 0) { 290 usage(EXIT_FAILURE); 291 } 292 } 293 free(r); 294 } 295 296 static void handle_arg_unset_env(const char *arg) 297 { 298 char *r, *p, *token; 299 r = p = strdup(arg); 300 while ((token = strsep(&p, ",")) != NULL) { 301 if (envlist_unsetenv(envlist, token) != 0) { 302 usage(EXIT_FAILURE); 303 } 304 } 305 free(r); 306 } 307 308 static void handle_arg_argv0(const char *arg) 309 { 310 argv0 = strdup(arg); 311 } 312 313 static void handle_arg_stack_size(const char *arg) 314 { 315 char *p; 316 guest_stack_size = strtoul(arg, &p, 0); 317 if (guest_stack_size == 0) { 318 usage(EXIT_FAILURE); 319 } 320 321 if (*p == 'M') { 322 guest_stack_size *= MiB; 323 } else if (*p == 'k' || *p == 'K') { 324 guest_stack_size *= KiB; 325 } 326 } 327 328 static void handle_arg_ld_prefix(const char *arg) 329 { 330 interp_prefix = strdup(arg); 331 } 332 333 static void handle_arg_pagesize(const char *arg) 334 { 335 qemu_host_page_size = atoi(arg); 336 if (qemu_host_page_size == 0 || 337 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) { 338 fprintf(stderr, "page size must be a power of two\n"); 339 exit(EXIT_FAILURE); 340 } 341 } 342 343 static void handle_arg_seed(const char *arg) 344 { 345 seed_optarg = arg; 346 } 347 348 static void handle_arg_gdb(const char *arg) 349 { 350 gdbstub = g_strdup(arg); 351 } 352 353 static void handle_arg_uname(const char *arg) 354 { 355 qemu_uname_release = strdup(arg); 356 } 357 358 static void handle_arg_cpu(const char *arg) 359 { 360 cpu_model = strdup(arg); 361 if (cpu_model == NULL || is_help_option(cpu_model)) { 362 list_cpus(); 363 exit(EXIT_FAILURE); 364 } 365 } 366 367 static void handle_arg_guest_base(const char *arg) 368 { 369 guest_base = strtol(arg, NULL, 0); 370 have_guest_base = true; 371 } 372 373 static void handle_arg_reserved_va(const char *arg) 374 { 375 char *p; 376 int shift = 0; 377 unsigned long val; 378 379 val = strtoul(arg, &p, 0); 380 switch (*p) { 381 case 'k': 382 case 'K': 383 shift = 10; 384 break; 385 case 'M': 386 shift = 20; 387 break; 388 case 'G': 389 shift = 30; 390 break; 391 } 392 if (shift) { 393 unsigned long unshifted = val; 394 p++; 395 val <<= shift; 396 if (val >> shift != unshifted) { 397 fprintf(stderr, "Reserved virtual address too big\n"); 398 exit(EXIT_FAILURE); 399 } 400 } 401 if (*p) { 402 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p); 403 exit(EXIT_FAILURE); 404 } 405 /* The representation is size - 1, with 0 remaining "default". */ 406 reserved_va = val ? val - 1 : 0; 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 ((reserved_va + 1) % qemu_host_page_size) { 796 char *s = size_to_str(qemu_host_page_size); 797 fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s); 798 g_free(s); 799 exit(EXIT_FAILURE); 800 } 801 if (max_reserved_va && reserved_va > max_reserved_va) { 802 fprintf(stderr, "Reserved virtual address too big\n"); 803 exit(EXIT_FAILURE); 804 } 805 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) { 806 /* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */ 807 reserved_va = max_reserved_va; 808 } 809 810 { 811 Error *err = NULL; 812 if (seed_optarg != NULL) { 813 qemu_guest_random_seed_main(seed_optarg, &err); 814 } else { 815 qcrypto_init(&err); 816 } 817 if (err) { 818 error_reportf_err(err, "cannot initialize crypto: "); 819 exit(1); 820 } 821 } 822 823 target_environ = envlist_to_environ(envlist, NULL); 824 envlist_free(envlist); 825 826 /* 827 * Read in mmap_min_addr kernel parameter. This value is used 828 * When loading the ELF image to determine whether guest_base 829 * is needed. It is also used in mmap_find_vma. 830 */ 831 { 832 FILE *fp; 833 834 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) { 835 unsigned long tmp; 836 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) { 837 mmap_min_addr = tmp; 838 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", 839 mmap_min_addr); 840 } 841 fclose(fp); 842 } 843 } 844 845 /* 846 * We prefer to not make NULL pointers accessible to QEMU. 847 * If we're in a chroot with no /proc, fall back to 1 page. 848 */ 849 if (mmap_min_addr == 0) { 850 mmap_min_addr = qemu_host_page_size; 851 qemu_log_mask(CPU_LOG_PAGE, 852 "host mmap_min_addr=0x%lx (fallback)\n", 853 mmap_min_addr); 854 } 855 856 /* 857 * Prepare copy of argv vector for target. 858 */ 859 target_argc = argc - optind; 860 target_argv = calloc(target_argc + 1, sizeof (char *)); 861 if (target_argv == NULL) { 862 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n"); 863 exit(EXIT_FAILURE); 864 } 865 866 /* 867 * If argv0 is specified (using '-0' switch) we replace 868 * argv[0] pointer with the given one. 869 */ 870 i = 0; 871 if (argv0 != NULL) { 872 target_argv[i++] = strdup(argv0); 873 } 874 for (; i < target_argc; i++) { 875 target_argv[i] = strdup(argv[optind + i]); 876 } 877 target_argv[target_argc] = NULL; 878 879 ts = g_new0(TaskState, 1); 880 init_task_state(ts); 881 /* build Task State */ 882 ts->info = info; 883 ts->bprm = &bprm; 884 cpu->opaque = ts; 885 task_settid(ts); 886 887 fd_trans_init(); 888 889 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs, 890 info, &bprm); 891 if (ret != 0) { 892 printf("Error while loading %s: %s\n", exec_path, strerror(-ret)); 893 _exit(EXIT_FAILURE); 894 } 895 896 for (wrk = target_environ; *wrk; wrk++) { 897 g_free(*wrk); 898 } 899 900 g_free(target_environ); 901 902 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 903 FILE *f = qemu_log_trylock(); 904 if (f) { 905 fprintf(f, "guest_base %p\n", (void *)guest_base); 906 fprintf(f, "page layout changed following binary load\n"); 907 page_dump(f); 908 909 fprintf(f, "start_brk 0x" TARGET_ABI_FMT_lx "\n", 910 info->start_brk); 911 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", 912 info->end_code); 913 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", 914 info->start_code); 915 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", 916 info->start_data); 917 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", 918 info->end_data); 919 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", 920 info->start_stack); 921 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", 922 info->brk); 923 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", 924 info->entry); 925 fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n", 926 info->argv); 927 fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n", 928 info->envp); 929 fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n", 930 info->saved_auxv); 931 qemu_log_unlock(f); 932 } 933 } 934 935 target_set_brk(info->brk); 936 syscall_init(); 937 signal_init(); 938 939 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay 940 generating the prologue until now so that the prologue can take 941 the real value of GUEST_BASE into account. */ 942 tcg_prologue_init(tcg_ctx); 943 944 target_cpu_copy_regs(env, regs); 945 946 if (gdbstub) { 947 if (gdbserver_start(gdbstub) < 0) { 948 fprintf(stderr, "qemu: could not open gdbserver on %s\n", 949 gdbstub); 950 exit(EXIT_FAILURE); 951 } 952 gdb_handlesig(cpu, 0); 953 } 954 955 #ifdef CONFIG_SEMIHOSTING 956 qemu_semihosting_guestfd_init(); 957 #endif 958 959 cpu_loop(env); 960 /* never exits */ 961 return 0; 962 } 963