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 static bool opt_one_insn_per_tb; 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 /* XXX: implement xxx_cpu_list for targets that still miss it */ 363 #if defined(cpu_list) 364 cpu_list(); 365 #endif 366 exit(EXIT_FAILURE); 367 } 368 } 369 370 static void handle_arg_guest_base(const char *arg) 371 { 372 guest_base = strtol(arg, NULL, 0); 373 have_guest_base = true; 374 } 375 376 static void handle_arg_reserved_va(const char *arg) 377 { 378 char *p; 379 int shift = 0; 380 unsigned long val; 381 382 val = strtoul(arg, &p, 0); 383 switch (*p) { 384 case 'k': 385 case 'K': 386 shift = 10; 387 break; 388 case 'M': 389 shift = 20; 390 break; 391 case 'G': 392 shift = 30; 393 break; 394 } 395 if (shift) { 396 unsigned long unshifted = val; 397 p++; 398 val <<= shift; 399 if (val >> shift != unshifted) { 400 fprintf(stderr, "Reserved virtual address too big\n"); 401 exit(EXIT_FAILURE); 402 } 403 } 404 if (*p) { 405 fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p); 406 exit(EXIT_FAILURE); 407 } 408 /* The representation is size - 1, with 0 remaining "default". */ 409 reserved_va = val ? val - 1 : 0; 410 } 411 412 static void handle_arg_one_insn_per_tb(const char *arg) 413 { 414 opt_one_insn_per_tb = true; 415 } 416 417 static void handle_arg_strace(const char *arg) 418 { 419 enable_strace = true; 420 } 421 422 static void handle_arg_version(const char *arg) 423 { 424 printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION 425 "\n" QEMU_COPYRIGHT "\n"); 426 exit(EXIT_SUCCESS); 427 } 428 429 static void handle_arg_trace(const char *arg) 430 { 431 trace_opt_parse(arg); 432 } 433 434 #if defined(TARGET_XTENSA) 435 static void handle_arg_abi_call0(const char *arg) 436 { 437 xtensa_set_abi_call0(); 438 } 439 #endif 440 441 static void handle_arg_perfmap(const char *arg) 442 { 443 perf_enable_perfmap(); 444 } 445 446 static void handle_arg_jitdump(const char *arg) 447 { 448 perf_enable_jitdump(); 449 } 450 451 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins); 452 453 #ifdef CONFIG_PLUGIN 454 static void handle_arg_plugin(const char *arg) 455 { 456 qemu_plugin_opt_parse(arg, &plugins); 457 } 458 #endif 459 460 struct qemu_argument { 461 const char *argv; 462 const char *env; 463 bool has_arg; 464 void (*handle_opt)(const char *arg); 465 const char *example; 466 const char *help; 467 }; 468 469 static const struct qemu_argument arg_table[] = { 470 {"h", "", false, handle_arg_help, 471 "", "print this help"}, 472 {"help", "", false, handle_arg_help, 473 "", ""}, 474 {"g", "QEMU_GDB", true, handle_arg_gdb, 475 "port", "wait gdb connection to 'port'"}, 476 {"L", "QEMU_LD_PREFIX", true, handle_arg_ld_prefix, 477 "path", "set the elf interpreter prefix to 'path'"}, 478 {"s", "QEMU_STACK_SIZE", true, handle_arg_stack_size, 479 "size", "set the stack size to 'size' bytes"}, 480 {"cpu", "QEMU_CPU", true, handle_arg_cpu, 481 "model", "select CPU (-cpu help for list)"}, 482 {"E", "QEMU_SET_ENV", true, handle_arg_set_env, 483 "var=value", "sets targets environment variable (see below)"}, 484 {"U", "QEMU_UNSET_ENV", true, handle_arg_unset_env, 485 "var", "unsets targets environment variable (see below)"}, 486 {"0", "QEMU_ARGV0", true, handle_arg_argv0, 487 "argv0", "forces target process argv[0] to be 'argv0'"}, 488 {"r", "QEMU_UNAME", true, handle_arg_uname, 489 "uname", "set qemu uname release string to 'uname'"}, 490 {"B", "QEMU_GUEST_BASE", true, handle_arg_guest_base, 491 "address", "set guest_base address to 'address'"}, 492 {"R", "QEMU_RESERVED_VA", true, handle_arg_reserved_va, 493 "size", "reserve 'size' bytes for guest virtual address space"}, 494 {"d", "QEMU_LOG", true, handle_arg_log, 495 "item[,...]", "enable logging of specified items " 496 "(use '-d help' for a list of items)"}, 497 {"dfilter", "QEMU_DFILTER", true, handle_arg_dfilter, 498 "range[,...]","filter logging based on address range"}, 499 {"D", "QEMU_LOG_FILENAME", true, handle_arg_log_filename, 500 "logfile", "write logs to 'logfile' (default stderr)"}, 501 {"p", "QEMU_PAGESIZE", true, handle_arg_pagesize, 502 "pagesize", "set the host page size to 'pagesize'"}, 503 {"one-insn-per-tb", 504 "QEMU_ONE_INSN_PER_TB", false, handle_arg_one_insn_per_tb, 505 "", "run with one guest instruction per emulated TB"}, 506 {"singlestep", "QEMU_SINGLESTEP", false, handle_arg_one_insn_per_tb, 507 "", "deprecated synonym for -one-insn-per-tb"}, 508 {"strace", "QEMU_STRACE", false, handle_arg_strace, 509 "", "log system calls"}, 510 {"seed", "QEMU_RAND_SEED", true, handle_arg_seed, 511 "", "Seed for pseudo-random number generator"}, 512 {"trace", "QEMU_TRACE", true, handle_arg_trace, 513 "", "[[enable=]<pattern>][,events=<file>][,file=<file>]"}, 514 #ifdef CONFIG_PLUGIN 515 {"plugin", "QEMU_PLUGIN", true, handle_arg_plugin, 516 "", "[file=]<file>[,<argname>=<argvalue>]"}, 517 #endif 518 {"version", "QEMU_VERSION", false, handle_arg_version, 519 "", "display version information and exit"}, 520 #if defined(TARGET_XTENSA) 521 {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0, 522 "", "assume CALL0 Xtensa ABI"}, 523 #endif 524 {"perfmap", "QEMU_PERFMAP", false, handle_arg_perfmap, 525 "", "Generate a /tmp/perf-${pid}.map file for perf"}, 526 {"jitdump", "QEMU_JITDUMP", false, handle_arg_jitdump, 527 "", "Generate a jit-${pid}.dump file for perf"}, 528 {NULL, NULL, false, NULL, NULL, NULL} 529 }; 530 531 static void usage(int exitcode) 532 { 533 const struct qemu_argument *arginfo; 534 int maxarglen; 535 int maxenvlen; 536 537 printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n" 538 "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n" 539 "\n" 540 "Options and associated environment variables:\n" 541 "\n"); 542 543 /* Calculate column widths. We must always have at least enough space 544 * for the column header. 545 */ 546 maxarglen = strlen("Argument"); 547 maxenvlen = strlen("Env-variable"); 548 549 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 550 int arglen = strlen(arginfo->argv); 551 if (arginfo->has_arg) { 552 arglen += strlen(arginfo->example) + 1; 553 } 554 if (strlen(arginfo->env) > maxenvlen) { 555 maxenvlen = strlen(arginfo->env); 556 } 557 if (arglen > maxarglen) { 558 maxarglen = arglen; 559 } 560 } 561 562 printf("%-*s %-*s Description\n", maxarglen+1, "Argument", 563 maxenvlen, "Env-variable"); 564 565 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 566 if (arginfo->has_arg) { 567 printf("-%s %-*s %-*s %s\n", arginfo->argv, 568 (int)(maxarglen - strlen(arginfo->argv) - 1), 569 arginfo->example, maxenvlen, arginfo->env, arginfo->help); 570 } else { 571 printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv, 572 maxenvlen, arginfo->env, 573 arginfo->help); 574 } 575 } 576 577 printf("\n" 578 "Defaults:\n" 579 "QEMU_LD_PREFIX = %s\n" 580 "QEMU_STACK_SIZE = %ld byte\n", 581 interp_prefix, 582 guest_stack_size); 583 584 printf("\n" 585 "You can use -E and -U options or the QEMU_SET_ENV and\n" 586 "QEMU_UNSET_ENV environment variables to set and unset\n" 587 "environment variables for the target process.\n" 588 "It is possible to provide several variables by separating them\n" 589 "by commas in getsubopt(3) style. Additionally it is possible to\n" 590 "provide the -E and -U options multiple times.\n" 591 "The following lines are equivalent:\n" 592 " -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n" 593 " -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n" 594 " QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n" 595 "Note that if you provide several changes to a single variable\n" 596 "the last change will stay in effect.\n" 597 "\n" 598 QEMU_HELP_BOTTOM "\n"); 599 600 exit(exitcode); 601 } 602 603 static int parse_args(int argc, char **argv) 604 { 605 const char *r; 606 int optind; 607 const struct qemu_argument *arginfo; 608 609 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 610 if (arginfo->env == NULL) { 611 continue; 612 } 613 614 r = getenv(arginfo->env); 615 if (r != NULL) { 616 arginfo->handle_opt(r); 617 } 618 } 619 620 optind = 1; 621 for (;;) { 622 if (optind >= argc) { 623 break; 624 } 625 r = argv[optind]; 626 if (r[0] != '-') { 627 break; 628 } 629 optind++; 630 r++; 631 if (!strcmp(r, "-")) { 632 break; 633 } 634 /* Treat --foo the same as -foo. */ 635 if (r[0] == '-') { 636 r++; 637 } 638 639 for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) { 640 if (!strcmp(r, arginfo->argv)) { 641 if (arginfo->has_arg) { 642 if (optind >= argc) { 643 (void) fprintf(stderr, 644 "qemu: missing argument for option '%s'\n", r); 645 exit(EXIT_FAILURE); 646 } 647 arginfo->handle_opt(argv[optind]); 648 optind++; 649 } else { 650 arginfo->handle_opt(NULL); 651 } 652 break; 653 } 654 } 655 656 /* no option matched the current argv */ 657 if (arginfo->handle_opt == NULL) { 658 (void) fprintf(stderr, "qemu: unknown option '%s'\n", r); 659 exit(EXIT_FAILURE); 660 } 661 } 662 663 if (optind >= argc) { 664 (void) fprintf(stderr, "qemu: no user program specified\n"); 665 exit(EXIT_FAILURE); 666 } 667 668 exec_path = argv[optind]; 669 670 return optind; 671 } 672 673 int main(int argc, char **argv, char **envp) 674 { 675 struct target_pt_regs regs1, *regs = ®s1; 676 struct image_info info1, *info = &info1; 677 struct linux_binprm bprm; 678 TaskState *ts; 679 CPUArchState *env; 680 CPUState *cpu; 681 int optind; 682 char **target_environ, **wrk; 683 char **target_argv; 684 int target_argc; 685 int i; 686 int ret; 687 int execfd; 688 unsigned long max_reserved_va; 689 bool preserve_argv0; 690 691 error_init(argv[0]); 692 module_call_init(MODULE_INIT_TRACE); 693 qemu_init_cpu_list(); 694 module_call_init(MODULE_INIT_QOM); 695 696 envlist = envlist_create(); 697 698 /* add current environment into the list */ 699 for (wrk = environ; *wrk != NULL; wrk++) { 700 (void) envlist_setenv(envlist, *wrk); 701 } 702 703 /* Read the stack limit from the kernel. If it's "unlimited", 704 then we can do little else besides use the default. */ 705 { 706 struct rlimit lim; 707 if (getrlimit(RLIMIT_STACK, &lim) == 0 708 && lim.rlim_cur != RLIM_INFINITY 709 && lim.rlim_cur == (target_long)lim.rlim_cur 710 && lim.rlim_cur > guest_stack_size) { 711 guest_stack_size = lim.rlim_cur; 712 } 713 } 714 715 cpu_model = NULL; 716 717 qemu_add_opts(&qemu_trace_opts); 718 qemu_plugin_add_opts(); 719 720 optind = parse_args(argc, argv); 721 722 qemu_set_log_filename_flags(last_log_filename, 723 last_log_mask | (enable_strace * LOG_STRACE), 724 &error_fatal); 725 726 if (!trace_init_backends()) { 727 exit(1); 728 } 729 trace_init_file(); 730 qemu_plugin_load_list(&plugins, &error_fatal); 731 732 /* Zero out regs */ 733 memset(regs, 0, sizeof(struct target_pt_regs)); 734 735 /* Zero out image_info */ 736 memset(info, 0, sizeof(struct image_info)); 737 738 memset(&bprm, 0, sizeof (bprm)); 739 740 /* Scan interp_prefix dir for replacement files. */ 741 init_paths(interp_prefix); 742 743 init_qemu_uname_release(); 744 745 /* 746 * Manage binfmt-misc open-binary flag 747 */ 748 execfd = qemu_getauxval(AT_EXECFD); 749 if (execfd == 0) { 750 execfd = open(exec_path, O_RDONLY); 751 if (execfd < 0) { 752 printf("Error while loading %s: %s\n", exec_path, strerror(errno)); 753 _exit(EXIT_FAILURE); 754 } 755 } 756 757 /* Resolve executable file name to full path name */ 758 if (realpath(exec_path, real_exec_path)) { 759 exec_path = real_exec_path; 760 } 761 762 /* 763 * get binfmt_misc flags 764 */ 765 preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0); 766 767 /* 768 * Manage binfmt-misc preserve-arg[0] flag 769 * argv[optind] full path to the binary 770 * argv[optind + 1] original argv[0] 771 */ 772 if (optind + 1 < argc && preserve_argv0) { 773 optind++; 774 } 775 776 if (cpu_model == NULL) { 777 cpu_model = cpu_get_model(get_elf_eflags(execfd)); 778 } 779 cpu_type = parse_cpu_option(cpu_model); 780 781 /* init tcg before creating CPUs and to get qemu_host_page_size */ 782 { 783 AccelState *accel = current_accel(); 784 AccelClass *ac = ACCEL_GET_CLASS(accel); 785 786 accel_init_interfaces(ac); 787 object_property_set_bool(OBJECT(accel), "one-insn-per-tb", 788 opt_one_insn_per_tb, &error_abort); 789 ac->init_machine(NULL); 790 } 791 cpu = cpu_create(cpu_type); 792 env = cpu->env_ptr; 793 cpu_reset(cpu); 794 thread_cpu = cpu; 795 796 /* 797 * Reserving too much vm space via mmap can run into problems 798 * with rlimits, oom due to page table creation, etc. We will 799 * still try it, if directed by the command-line option, but 800 * not by default. 801 */ 802 max_reserved_va = MAX_RESERVED_VA(cpu); 803 if (reserved_va != 0) { 804 if ((reserved_va + 1) % qemu_host_page_size) { 805 char *s = size_to_str(qemu_host_page_size); 806 fprintf(stderr, "Reserved virtual address not aligned mod %s\n", s); 807 g_free(s); 808 exit(EXIT_FAILURE); 809 } 810 if (max_reserved_va && reserved_va > max_reserved_va) { 811 fprintf(stderr, "Reserved virtual address too big\n"); 812 exit(EXIT_FAILURE); 813 } 814 } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) { 815 /* MAX_RESERVED_VA + 1 is a large power of 2, so is aligned. */ 816 reserved_va = max_reserved_va; 817 } 818 819 { 820 Error *err = NULL; 821 if (seed_optarg != NULL) { 822 qemu_guest_random_seed_main(seed_optarg, &err); 823 } else { 824 qcrypto_init(&err); 825 } 826 if (err) { 827 error_reportf_err(err, "cannot initialize crypto: "); 828 exit(1); 829 } 830 } 831 832 target_environ = envlist_to_environ(envlist, NULL); 833 envlist_free(envlist); 834 835 /* 836 * Read in mmap_min_addr kernel parameter. This value is used 837 * When loading the ELF image to determine whether guest_base 838 * is needed. It is also used in mmap_find_vma. 839 */ 840 { 841 FILE *fp; 842 843 if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) { 844 unsigned long tmp; 845 if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) { 846 mmap_min_addr = tmp; 847 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", 848 mmap_min_addr); 849 } 850 fclose(fp); 851 } 852 } 853 854 /* 855 * We prefer to not make NULL pointers accessible to QEMU. 856 * If we're in a chroot with no /proc, fall back to 1 page. 857 */ 858 if (mmap_min_addr == 0) { 859 mmap_min_addr = qemu_host_page_size; 860 qemu_log_mask(CPU_LOG_PAGE, 861 "host mmap_min_addr=0x%lx (fallback)\n", 862 mmap_min_addr); 863 } 864 865 /* 866 * Prepare copy of argv vector for target. 867 */ 868 target_argc = argc - optind; 869 target_argv = calloc(target_argc + 1, sizeof (char *)); 870 if (target_argv == NULL) { 871 (void) fprintf(stderr, "Unable to allocate memory for target_argv\n"); 872 exit(EXIT_FAILURE); 873 } 874 875 /* 876 * If argv0 is specified (using '-0' switch) we replace 877 * argv[0] pointer with the given one. 878 */ 879 i = 0; 880 if (argv0 != NULL) { 881 target_argv[i++] = strdup(argv0); 882 } 883 for (; i < target_argc; i++) { 884 target_argv[i] = strdup(argv[optind + i]); 885 } 886 target_argv[target_argc] = NULL; 887 888 ts = g_new0(TaskState, 1); 889 init_task_state(ts); 890 /* build Task State */ 891 ts->info = info; 892 ts->bprm = &bprm; 893 cpu->opaque = ts; 894 task_settid(ts); 895 896 fd_trans_init(); 897 898 ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs, 899 info, &bprm); 900 if (ret != 0) { 901 printf("Error while loading %s: %s\n", exec_path, strerror(-ret)); 902 _exit(EXIT_FAILURE); 903 } 904 905 for (wrk = target_environ; *wrk; wrk++) { 906 g_free(*wrk); 907 } 908 909 g_free(target_environ); 910 911 if (qemu_loglevel_mask(CPU_LOG_PAGE)) { 912 FILE *f = qemu_log_trylock(); 913 if (f) { 914 fprintf(f, "guest_base %p\n", (void *)guest_base); 915 fprintf(f, "page layout changed following binary load\n"); 916 page_dump(f); 917 918 fprintf(f, "start_brk 0x" TARGET_ABI_FMT_lx "\n", 919 info->start_brk); 920 fprintf(f, "end_code 0x" TARGET_ABI_FMT_lx "\n", 921 info->end_code); 922 fprintf(f, "start_code 0x" TARGET_ABI_FMT_lx "\n", 923 info->start_code); 924 fprintf(f, "start_data 0x" TARGET_ABI_FMT_lx "\n", 925 info->start_data); 926 fprintf(f, "end_data 0x" TARGET_ABI_FMT_lx "\n", 927 info->end_data); 928 fprintf(f, "start_stack 0x" TARGET_ABI_FMT_lx "\n", 929 info->start_stack); 930 fprintf(f, "brk 0x" TARGET_ABI_FMT_lx "\n", 931 info->brk); 932 fprintf(f, "entry 0x" TARGET_ABI_FMT_lx "\n", 933 info->entry); 934 fprintf(f, "argv_start 0x" TARGET_ABI_FMT_lx "\n", 935 info->argv); 936 fprintf(f, "env_start 0x" TARGET_ABI_FMT_lx "\n", 937 info->envp); 938 fprintf(f, "auxv_start 0x" TARGET_ABI_FMT_lx "\n", 939 info->saved_auxv); 940 qemu_log_unlock(f); 941 } 942 } 943 944 target_set_brk(info->brk); 945 syscall_init(); 946 signal_init(); 947 948 /* Now that we've loaded the binary, GUEST_BASE is fixed. Delay 949 generating the prologue until now so that the prologue can take 950 the real value of GUEST_BASE into account. */ 951 tcg_prologue_init(tcg_ctx); 952 953 target_cpu_copy_regs(env, regs); 954 955 if (gdbstub) { 956 if (gdbserver_start(gdbstub) < 0) { 957 fprintf(stderr, "qemu: could not open gdbserver on %s\n", 958 gdbstub); 959 exit(EXIT_FAILURE); 960 } 961 gdb_handlesig(cpu, 0); 962 } 963 964 #ifdef CONFIG_SEMIHOSTING 965 qemu_semihosting_guestfd_init(); 966 #endif 967 968 cpu_loop(env); 969 /* never exits */ 970 return 0; 971 } 972