linux-user/main.c

   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-common.h"
  22 #include "qemu/units.h"
  23 #include "qemu/accel.h"
  24 #include "sysemu/tcg.h"
  25 #include "qemu-version.h"
  26 #include <sys/syscall.h>
  27 #include <sys/resource.h>
  28 #include <sys/shm.h>
  29 #include <linux/binfmts.h>
  30
  31 #include "qapi/error.h"
  32 #include "qemu.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 "cpu.h"
  42 #include "exec/exec-all.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
  53 #ifndef AT_FLAGS_PRESERVE_ARGV0
  54 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0
  55 #define AT_FLAGS_PRESERVE_ARGV0 (1 << AT_FLAGS_PRESERVE_ARGV0_BIT)
  56 #endif
  57
  58 char *exec_path;
  59
  60 int singlestep;
  61 static const char *argv0;
  62 static const char *gdbstub;
  63 static envlist_t *envlist;
  64 static const char *cpu_model;
  65 static const char *cpu_type;
  66 static const char *seed_optarg;
  67 unsigned long mmap_min_addr;
  68 uintptr_t guest_base;
  69 bool have_guest_base;
  70
  71 /*
  72  * Used to implement backwards-compatibility for the `-strace`, and
  73  * QEMU_STRACE options. Without this, the QEMU_LOG can be overwritten by
  74  * -strace, or vice versa.
  75  */
  76 static bool enable_strace;
  77
  78 /*
  79  * The last log mask given by the user in an environment variable or argument.
  80  * Used to support command line arguments overriding environment variables.
  81  */
  82 static int last_log_mask;
  83
  84 /*
  85  * When running 32-on-64 we should make sure we can fit all of the possible
  86  * guest address space into a contiguous chunk of virtual host memory.
  87  *
  88  * This way we will never overlap with our own libraries or binaries or stack
  89  * or anything else that QEMU maps.
  90  *
  91  * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
  92  * of the address for the kernel.  Some cpus rely on this and user space
  93  * uses the high bit(s) for pointer tagging and the like.  For them, we
  94  * must preserve the expected address space.
  95  */
  96 #ifndef MAX_RESERVED_VA
  97 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
  98 #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
  99       (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
 100 /* There are a number of places where we assign reserved_va to a variable
 101    of type abi_ulong and expect it to fit.  Avoid the last page.  */
 102 #   define MAX_RESERVED_VA(CPU)  (0xfffffffful & TARGET_PAGE_MASK)
 103 #  else
 104 #   define MAX_RESERVED_VA(CPU)  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
 105 #  endif
 106 # else
 107 #  define MAX_RESERVED_VA(CPU)  0
 108 # endif
 109 #endif
 110
 111 unsigned long reserved_va;
 112
 113 static void usage(int exitcode);
 114
 115 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
 116 const char *qemu_uname_release;
 117
 118 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
 119    we allocate a bigger stack. Need a better solution, for example
 120    by remapping the process stack directly at the right place */
 121 unsigned long guest_stack_size = 8 * 1024 * 1024UL;
 122
 123 #if defined(TARGET_I386)
 124 int cpu_get_pic_interrupt(CPUX86State *env)
 125 {
 126     return -1;
 127 }
 128 #endif
 129
 130 /***********************************************************/
 131 /* Helper routines for implementing atomic operations.  */
 132
 133 /* Make sure everything is in a consistent state for calling fork().  */
 134 void fork_start(void)
 135 {
 136     start_exclusive();
 137     mmap_fork_start();
 138     cpu_list_lock();
 139 }
 140
 141 void fork_end(int child)
 142 {
 143     mmap_fork_end(child);
 144     if (child) {
 145         CPUState *cpu, *next_cpu;
 146         /* Child processes created by fork() only have a single thread.
 147            Discard information about the parent threads.  */
 148         CPU_FOREACH_SAFE(cpu, next_cpu) {
 149             if (cpu != thread_cpu) {
 150                 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
 151             }
 152         }
 153         qemu_init_cpu_list();
 154         gdbserver_fork(thread_cpu);
 155         /* qemu_init_cpu_list() takes care of reinitializing the
 156          * exclusive state, so we don't need to end_exclusive() here.
 157          */
 158     } else {
 159         cpu_list_unlock();
 160         end_exclusive();
 161     }
 162 }
 163
 164 __thread CPUState *thread_cpu;
 165
 166 bool qemu_cpu_is_self(CPUState *cpu)
 167 {
 168     return thread_cpu == cpu;
 169 }
 170
 171 void qemu_cpu_kick(CPUState *cpu)
 172 {
 173     cpu_exit(cpu);
 174 }
 175
 176 void task_settid(TaskState *ts)
 177 {
 178     if (ts->ts_tid == 0) {
 179         ts->ts_tid = (pid_t)syscall(SYS_gettid);
 180     }
 181 }
 182
 183 void stop_all_tasks(void)
 184 {
 185     /*
 186      * We trust that when using NPTL, start_exclusive()
 187      * handles thread stopping correctly.
 188      */
 189     start_exclusive();
 190 }
 191
 192 /* Assumes contents are already zeroed.  */
 193 void init_task_state(TaskState *ts)
 194 {
 195     ts->used = 1;
 196     ts->sigaltstack_used = (struct target_sigaltstack) {
 197         .ss_sp = 0,
 198         .ss_size = 0,
 199         .ss_flags = TARGET_SS_DISABLE,
 200     };
 201 }
 202
 203 CPUArchState *cpu_copy(CPUArchState *env)
 204 {
 205     CPUState *cpu = env_cpu(env);
 206     CPUState *new_cpu = cpu_create(cpu_type);
 207     CPUArchState *new_env = new_cpu->env_ptr;
 208     CPUBreakpoint *bp;
 209     CPUWatchpoint *wp;
 210
 211     /* Reset non arch specific state */
 212     cpu_reset(new_cpu);
 213
 214     new_cpu->tcg_cflags = cpu->tcg_cflags;
 215     memcpy(new_env, env, sizeof(CPUArchState));
 216
 217     /* Clone all break/watchpoints.
 218        Note: Once we support ptrace with hw-debug register access, make sure
 219        BP_CPU break/watchpoints are handled correctly on clone. */
 220     QTAILQ_INIT(&new_cpu->breakpoints);
 221     QTAILQ_INIT(&new_cpu->watchpoints);
 222     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 223         cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
 224     }
 225     QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
 226         cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
 227     }
 228
 229     return new_env;
 230 }
 231
 232 static void handle_arg_help(const char *arg)
 233 {
 234     usage(EXIT_SUCCESS);
 235 }
 236
 237 static void handle_arg_log(const char *arg)
 238 {
 239     last_log_mask = qemu_str_to_log_mask(arg);
 240     if (!last_log_mask) {
 241         qemu_print_log_usage(stdout);
 242         exit(EXIT_FAILURE);
 243     }
 244 }
 245
 246 static void handle_arg_dfilter(const char *arg)
 247 {
 248     qemu_set_dfilter_ranges(arg, &error_fatal);
 249 }
 250
 251 static void handle_arg_log_filename(const char *arg)
 252 {
 253     qemu_set_log_filename(arg, &error_fatal);
 254 }
 255
 256 static void handle_arg_set_env(const char *arg)
 257 {
 258     char *r, *p, *token;
 259     r = p = strdup(arg);
 260     while ((token = strsep(&p, ",")) != NULL) {
 261         if (envlist_setenv(envlist, token) != 0) {
 262             usage(EXIT_FAILURE);
 263         }
 264     }
 265     free(r);
 266 }
 267
 268 static void handle_arg_unset_env(const char *arg)
 269 {
 270     char *r, *p, *token;
 271     r = p = strdup(arg);
 272     while ((token = strsep(&p, ",")) != NULL) {
 273         if (envlist_unsetenv(envlist, token) != 0) {
 274             usage(EXIT_FAILURE);
 275         }
 276     }
 277     free(r);
 278 }
 279
 280 static void handle_arg_argv0(const char *arg)
 281 {
 282     argv0 = strdup(arg);
 283 }
 284
 285 static void handle_arg_stack_size(const char *arg)
 286 {
 287     char *p;
 288     guest_stack_size = strtoul(arg, &p, 0);
 289     if (guest_stack_size == 0) {
 290         usage(EXIT_FAILURE);
 291     }
 292
 293     if (*p == 'M') {
 294         guest_stack_size *= MiB;
 295     } else if (*p == 'k' || *p == 'K') {
 296         guest_stack_size *= KiB;
 297     }
 298 }
 299
 300 static void handle_arg_ld_prefix(const char *arg)
 301 {
 302     interp_prefix = strdup(arg);
 303 }
 304
 305 static void handle_arg_pagesize(const char *arg)
 306 {
 307     qemu_host_page_size = atoi(arg);
 308     if (qemu_host_page_size == 0 ||
 309         (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 310         fprintf(stderr, "page size must be a power of two\n");
 311         exit(EXIT_FAILURE);
 312     }
 313 }
 314
 315 static void handle_arg_seed(const char *arg)
 316 {
 317     seed_optarg = arg;
 318 }
 319
 320 static void handle_arg_gdb(const char *arg)
 321 {
 322     gdbstub = g_strdup(arg);
 323 }
 324
 325 static void handle_arg_uname(const char *arg)
 326 {
 327     qemu_uname_release = strdup(arg);
 328 }
 329
 330 static void handle_arg_cpu(const char *arg)
 331 {
 332     cpu_model = strdup(arg);
 333     if (cpu_model == NULL || is_help_option(cpu_model)) {
 334         /* XXX: implement xxx_cpu_list for targets that still miss it */
 335 #if defined(cpu_list)
 336         cpu_list();
 337 #endif
 338         exit(EXIT_FAILURE);
 339     }
 340 }
 341
 342 static void handle_arg_guest_base(const char *arg)
 343 {
 344     guest_base = strtol(arg, NULL, 0);
 345     have_guest_base = true;
 346 }
 347
 348 static void handle_arg_reserved_va(const char *arg)
 349 {
 350     char *p;
 351     int shift = 0;
 352     reserved_va = strtoul(arg, &p, 0);
 353     switch (*p) {
 354     case 'k':
 355     case 'K':
 356         shift = 10;
 357         break;
 358     case 'M':
 359         shift = 20;
 360         break;
 361     case 'G':
 362         shift = 30;
 363         break;
 364     }
 365     if (shift) {
 366         unsigned long unshifted = reserved_va;
 367         p++;
 368         reserved_va <<= shift;
 369         if (reserved_va >> shift != unshifted) {
 370             fprintf(stderr, "Reserved virtual address too big\n");
 371             exit(EXIT_FAILURE);
 372         }
 373     }
 374     if (*p) {
 375         fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
 376         exit(EXIT_FAILURE);
 377     }
 378 }
 379
 380 static void handle_arg_singlestep(const char *arg)
 381 {
 382     singlestep = 1;
 383 }
 384
 385 static void handle_arg_strace(const char *arg)
 386 {
 387     enable_strace = true;
 388 }
 389
 390 static void handle_arg_version(const char *arg)
 391 {
 392     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
 393            "\n" QEMU_COPYRIGHT "\n");
 394     exit(EXIT_SUCCESS);
 395 }
 396
 397 static void handle_arg_trace(const char *arg)
 398 {
 399     trace_opt_parse(arg);
 400 }
 401
 402 #if defined(TARGET_XTENSA)
 403 static void handle_arg_abi_call0(const char *arg)
 404 {
 405     xtensa_set_abi_call0();
 406 }
 407 #endif
 408
 409 static QemuPluginList plugins = QTAILQ_HEAD_INITIALIZER(plugins);
 410
 411 #ifdef CONFIG_PLUGIN
 412 static void handle_arg_plugin(const char *arg)
 413 {
 414     qemu_plugin_opt_parse(arg, &plugins);
 415 }
 416 #endif
 417
 418 struct qemu_argument {
 419     const char *argv;
 420     const char *env;
 421     bool has_arg;
 422     void (*handle_opt)(const char *arg);
 423     const char *example;
 424     const char *help;
 425 };
 426
 427 static const struct qemu_argument arg_table[] = {
 428     {"h",          "",                 false, handle_arg_help,
 429      "",           "print this help"},
 430     {"help",       "",                 false, handle_arg_help,
 431      "",           ""},
 432     {"g",          "QEMU_GDB",         true,  handle_arg_gdb,
 433      "port",       "wait gdb connection to 'port'"},
 434     {"L",          "QEMU_LD_PREFIX",   true,  handle_arg_ld_prefix,
 435      "path",       "set the elf interpreter prefix to 'path'"},
 436     {"s",          "QEMU_STACK_SIZE",  true,  handle_arg_stack_size,
 437      "size",       "set the stack size to 'size' bytes"},
 438     {"cpu",        "QEMU_CPU",         true,  handle_arg_cpu,
 439      "model",      "select CPU (-cpu help for list)"},
 440     {"E",          "QEMU_SET_ENV",     true,  handle_arg_set_env,
 441      "var=value",  "sets targets environment variable (see below)"},
 442     {"U",          "QEMU_UNSET_ENV",   true,  handle_arg_unset_env,
 443      "var",        "unsets targets environment variable (see below)"},
 444     {"0",          "QEMU_ARGV0",       true,  handle_arg_argv0,
 445      "argv0",      "forces target process argv[0] to be 'argv0'"},
 446     {"r",          "QEMU_UNAME",       true,  handle_arg_uname,
 447      "uname",      "set qemu uname release string to 'uname'"},
 448     {"B",          "QEMU_GUEST_BASE",  true,  handle_arg_guest_base,
 449      "address",    "set guest_base address to 'address'"},
 450     {"R",          "QEMU_RESERVED_VA", true,  handle_arg_reserved_va,
 451      "size",       "reserve 'size' bytes for guest virtual address space"},
 452     {"d",          "QEMU_LOG",         true,  handle_arg_log,
 453      "item[,...]", "enable logging of specified items "
 454      "(use '-d help' for a list of items)"},
 455     {"dfilter",    "QEMU_DFILTER",     true,  handle_arg_dfilter,
 456      "range[,...]","filter logging based on address range"},
 457     {"D",          "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
 458      "logfile",     "write logs to 'logfile' (default stderr)"},
 459     {"p",          "QEMU_PAGESIZE",    true,  handle_arg_pagesize,
 460      "pagesize",   "set the host page size to 'pagesize'"},
 461     {"singlestep", "QEMU_SINGLESTEP",  false, handle_arg_singlestep,
 462      "",           "run in singlestep mode"},
 463     {"strace",     "QEMU_STRACE",      false, handle_arg_strace,
 464      "",           "log system calls"},
 465     {"seed",       "QEMU_RAND_SEED",   true,  handle_arg_seed,
 466      "",           "Seed for pseudo-random number generator"},
 467     {"trace",      "QEMU_TRACE",       true,  handle_arg_trace,
 468      "",           "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
 469 #ifdef CONFIG_PLUGIN
 470     {"plugin",     "QEMU_PLUGIN",      true,  handle_arg_plugin,
 471      "",           "[file=]<file>[,arg=<string>]"},
 472 #endif
 473     {"version",    "QEMU_VERSION",     false, handle_arg_version,
 474      "",           "display version information and exit"},
 475 #if defined(TARGET_XTENSA)
 476     {"xtensa-abi-call0", "QEMU_XTENSA_ABI_CALL0", false, handle_arg_abi_call0,
 477      "",           "assume CALL0 Xtensa ABI"},
 478 #endif
 479     {NULL, NULL, false, NULL, NULL, NULL}
 480 };
 481
 482 static void usage(int exitcode)
 483 {
 484     const struct qemu_argument *arginfo;
 485     int maxarglen;
 486     int maxenvlen;
 487
 488     printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
 489            "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
 490            "\n"
 491            "Options and associated environment variables:\n"
 492            "\n");
 493
 494     /* Calculate column widths. We must always have at least enough space
 495      * for the column header.
 496      */
 497     maxarglen = strlen("Argument");
 498     maxenvlen = strlen("Env-variable");
 499
 500     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 501         int arglen = strlen(arginfo->argv);
 502         if (arginfo->has_arg) {
 503             arglen += strlen(arginfo->example) + 1;
 504         }
 505         if (strlen(arginfo->env) > maxenvlen) {
 506             maxenvlen = strlen(arginfo->env);
 507         }
 508         if (arglen > maxarglen) {
 509             maxarglen = arglen;
 510         }
 511     }
 512
 513     printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
 514             maxenvlen, "Env-variable");
 515
 516     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 517         if (arginfo->has_arg) {
 518             printf("-%s %-*s %-*s %s\n", arginfo->argv,
 519                    (int)(maxarglen - strlen(arginfo->argv) - 1),
 520                    arginfo->example, maxenvlen, arginfo->env, arginfo->help);
 521         } else {
 522             printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
 523                     maxenvlen, arginfo->env,
 524                     arginfo->help);
 525         }
 526     }
 527
 528     printf("\n"
 529            "Defaults:\n"
 530            "QEMU_LD_PREFIX  = %s\n"
 531            "QEMU_STACK_SIZE = %ld byte\n",
 532            interp_prefix,
 533            guest_stack_size);
 534
 535     printf("\n"
 536            "You can use -E and -U options or the QEMU_SET_ENV and\n"
 537            "QEMU_UNSET_ENV environment variables to set and unset\n"
 538            "environment variables for the target process.\n"
 539            "It is possible to provide several variables by separating them\n"
 540            "by commas in getsubopt(3) style. Additionally it is possible to\n"
 541            "provide the -E and -U options multiple times.\n"
 542            "The following lines are equivalent:\n"
 543            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 544            "    -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
 545            "    QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
 546            "Note that if you provide several changes to a single variable\n"
 547            "the last change will stay in effect.\n"
 548            "\n"
 549            QEMU_HELP_BOTTOM "\n");
 550
 551     exit(exitcode);
 552 }
 553
 554 static int parse_args(int argc, char **argv)
 555 {
 556     const char *r;
 557     int optind;
 558     const struct qemu_argument *arginfo;
 559
 560     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 561         if (arginfo->env == NULL) {
 562             continue;
 563         }
 564
 565         r = getenv(arginfo->env);
 566         if (r != NULL) {
 567             arginfo->handle_opt(r);
 568         }
 569     }
 570
 571     optind = 1;
 572     for (;;) {
 573         if (optind >= argc) {
 574             break;
 575         }
 576         r = argv[optind];
 577         if (r[0] != '-') {
 578             break;
 579         }
 580         optind++;
 581         r++;
 582         if (!strcmp(r, "-")) {
 583             break;
 584         }
 585         /* Treat --foo the same as -foo.  */
 586         if (r[0] == '-') {
 587             r++;
 588         }
 589
 590         for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 591             if (!strcmp(r, arginfo->argv)) {
 592                 if (arginfo->has_arg) {
 593                     if (optind >= argc) {
 594                         (void) fprintf(stderr,
 595                             "qemu: missing argument for option '%s'\n", r);
 596                         exit(EXIT_FAILURE);
 597                     }
 598                     arginfo->handle_opt(argv[optind]);
 599                     optind++;
 600                 } else {
 601                     arginfo->handle_opt(NULL);
 602                 }
 603                 break;
 604             }
 605         }
 606
 607         /* no option matched the current argv */
 608         if (arginfo->handle_opt == NULL) {
 609             (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
 610             exit(EXIT_FAILURE);
 611         }
 612     }
 613
 614     if (optind >= argc) {
 615         (void) fprintf(stderr, "qemu: no user program specified\n");
 616         exit(EXIT_FAILURE);
 617     }
 618
 619     exec_path = argv[optind];
 620
 621     return optind;
 622 }
 623
 624 int main(int argc, char **argv, char **envp)
 625 {
 626     struct target_pt_regs regs1, *regs = &regs1;
 627     struct image_info info1, *info = &info1;
 628     struct linux_binprm bprm;
 629     TaskState *ts;
 630     CPUArchState *env;
 631     CPUState *cpu;
 632     int optind;
 633     char **target_environ, **wrk;
 634     char **target_argv;
 635     int target_argc;
 636     int i;
 637     int ret;
 638     int execfd;
 639     int log_mask;
 640     unsigned long max_reserved_va;
 641     bool preserve_argv0;
 642
 643     error_init(argv[0]);
 644     module_call_init(MODULE_INIT_TRACE);
 645     qemu_init_cpu_list();
 646     module_call_init(MODULE_INIT_QOM);
 647
 648     envlist = envlist_create();
 649
 650     /* add current environment into the list */
 651     for (wrk = environ; *wrk != NULL; wrk++) {
 652         (void) envlist_setenv(envlist, *wrk);
 653     }
 654
 655     /* Read the stack limit from the kernel.  If it's "unlimited",
 656        then we can do little else besides use the default.  */
 657     {
 658         struct rlimit lim;
 659         if (getrlimit(RLIMIT_STACK, &lim) == 0
 660             && lim.rlim_cur != RLIM_INFINITY
 661             && lim.rlim_cur == (target_long)lim.rlim_cur) {
 662             guest_stack_size = lim.rlim_cur;
 663         }
 664     }
 665
 666     cpu_model = NULL;
 667
 668     qemu_add_opts(&qemu_trace_opts);
 669     qemu_plugin_add_opts();
 670
 671     optind = parse_args(argc, argv);
 672
 673     log_mask = last_log_mask | (enable_strace ? LOG_STRACE : 0);
 674     if (log_mask) {
 675         qemu_log_needs_buffers();
 676         qemu_set_log(log_mask);
 677     }
 678
 679     if (!trace_init_backends()) {
 680         exit(1);
 681     }
 682     trace_init_file();
 683     qemu_plugin_load_list(&plugins, &error_fatal);
 684
 685     /* Zero out regs */
 686     memset(regs, 0, sizeof(struct target_pt_regs));
 687
 688     /* Zero out image_info */
 689     memset(info, 0, sizeof(struct image_info));
 690
 691     memset(&bprm, 0, sizeof (bprm));
 692
 693     /* Scan interp_prefix dir for replacement files. */
 694     init_paths(interp_prefix);
 695
 696     init_qemu_uname_release();
 697
 698     /*
 699      * Manage binfmt-misc open-binary flag
 700      */
 701     execfd = qemu_getauxval(AT_EXECFD);
 702     if (execfd == 0) {
 703         execfd = open(exec_path, O_RDONLY);
 704         if (execfd < 0) {
 705             printf("Error while loading %s: %s\n", exec_path, strerror(errno));
 706             _exit(EXIT_FAILURE);
 707         }
 708     }
 709
 710     /*
 711      * get binfmt_misc flags
 712      */
 713     preserve_argv0 = !!(qemu_getauxval(AT_FLAGS) & AT_FLAGS_PRESERVE_ARGV0);
 714
 715     /*
 716      * Manage binfmt-misc preserve-arg[0] flag
 717      *    argv[optind]     full path to the binary
 718      *    argv[optind + 1] original argv[0]
 719      */
 720     if (optind + 1 < argc && preserve_argv0) {
 721         optind++;
 722     }
 723
 724     if (cpu_model == NULL) {
 725         cpu_model = cpu_get_model(get_elf_eflags(execfd));
 726     }
 727     cpu_type = parse_cpu_option(cpu_model);
 728
 729     /* init tcg before creating CPUs and to get qemu_host_page_size */
 730     {
 731         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 732
 733         ac->init_machine(NULL);
 734         accel_init_interfaces(ac);
 735     }
 736     cpu = cpu_create(cpu_type);
 737     env = cpu->env_ptr;
 738     cpu_reset(cpu);
 739     thread_cpu = cpu;
 740
 741     /*
 742      * Reserving too much vm space via mmap can run into problems
 743      * with rlimits, oom due to page table creation, etc.  We will
 744      * still try it, if directed by the command-line option, but
 745      * not by default.
 746      */
 747     max_reserved_va = MAX_RESERVED_VA(cpu);
 748     if (reserved_va != 0) {
 749         if (max_reserved_va && reserved_va > max_reserved_va) {
 750             fprintf(stderr, "Reserved virtual address too big\n");
 751             exit(EXIT_FAILURE);
 752         }
 753     } else if (HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32) {
 754         /*
 755          * reserved_va must be aligned with the host page size
 756          * as it is used with mmap()
 757          */
 758         reserved_va = max_reserved_va & qemu_host_page_mask;
 759     }
 760
 761     {
 762         Error *err = NULL;
 763         if (seed_optarg != NULL) {
 764             qemu_guest_random_seed_main(seed_optarg, &err);
 765         } else {
 766             qcrypto_init(&err);
 767         }
 768         if (err) {
 769             error_reportf_err(err, "cannot initialize crypto: ");
 770             exit(1);
 771         }
 772     }
 773
 774     target_environ = envlist_to_environ(envlist, NULL);
 775     envlist_free(envlist);
 776
 777     /*
 778      * Read in mmap_min_addr kernel parameter.  This value is used
 779      * When loading the ELF image to determine whether guest_base
 780      * is needed.  It is also used in mmap_find_vma.
 781      */
 782     {
 783         FILE *fp;
 784
 785         if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
 786             unsigned long tmp;
 787             if (fscanf(fp, "%lu", &tmp) == 1 && tmp != 0) {
 788                 mmap_min_addr = tmp;
 789                 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n",
 790                               mmap_min_addr);
 791             }
 792             fclose(fp);
 793         }
 794     }
 795
 796     /*
 797      * We prefer to not make NULL pointers accessible to QEMU.
 798      * If we're in a chroot with no /proc, fall back to 1 page.
 799      */
 800     if (mmap_min_addr == 0) {
 801         mmap_min_addr = qemu_host_page_size;
 802         qemu_log_mask(CPU_LOG_PAGE,
 803                       "host mmap_min_addr=0x%lx (fallback)\n",
 804                       mmap_min_addr);
 805     }
 806
 807     /*
 808      * Prepare copy of argv vector for target.
 809      */
 810     target_argc = argc - optind;
 811     target_argv = calloc(target_argc + 1, sizeof (char *));
 812     if (target_argv == NULL) {
 813         (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
 814         exit(EXIT_FAILURE);
 815     }
 816
 817     /*
 818      * If argv0 is specified (using '-0' switch) we replace
 819      * argv[0] pointer with the given one.
 820      */
 821     i = 0;
 822     if (argv0 != NULL) {
 823         target_argv[i++] = strdup(argv0);
 824     }
 825     for (; i < target_argc; i++) {
 826         target_argv[i] = strdup(argv[optind + i]);
 827     }
 828     target_argv[target_argc] = NULL;
 829
 830     ts = g_new0(TaskState, 1);
 831     init_task_state(ts);
 832     /* build Task State */
 833     ts->info = info;
 834     ts->bprm = &bprm;
 835     cpu->opaque = ts;
 836     task_settid(ts);
 837
 838     ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
 839         info, &bprm);
 840     if (ret != 0) {
 841         printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
 842         _exit(EXIT_FAILURE);
 843     }
 844
 845     for (wrk = target_environ; *wrk; wrk++) {
 846         g_free(*wrk);
 847     }
 848
 849     g_free(target_environ);
 850
 851     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 852         qemu_log("guest_base  %p\n", (void *)guest_base);
 853         log_page_dump("binary load");
 854
 855         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 856         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 857         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n", info->start_code);
 858         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n", info->start_data);
 859         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 860         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
 861         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 862         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 863         qemu_log("argv_start  0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
 864         qemu_log("env_start   0x" TARGET_ABI_FMT_lx "\n",
 865                  info->arg_end + (abi_ulong)sizeof(abi_ulong));
 866         qemu_log("auxv_start  0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
 867     }
 868
 869     target_set_brk(info->brk);
 870     syscall_init();
 871     signal_init();
 872
 873     /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 874        generating the prologue until now so that the prologue can take
 875        the real value of GUEST_BASE into account.  */
 876     tcg_prologue_init(tcg_ctx);
 877     tcg_region_init();
 878
 879     target_cpu_copy_regs(env, regs);
 880
 881     if (gdbstub) {
 882         if (gdbserver_start(gdbstub) < 0) {
 883             fprintf(stderr, "qemu: could not open gdbserver on %s\n",
 884                     gdbstub);
 885             exit(EXIT_FAILURE);
 886         }
 887         gdb_handlesig(cpu, 0);
 888     }
 889     cpu_loop(env);
 890     /* never exits */
 891     return 0;
 892 }