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 #include "qemu/osdep.h"
  20 #include "qemu/units.h"
  21 #include "qemu-version.h"
  22 #include <sys/syscall.h>
  23 #include <sys/resource.h>
  24
  25 #include "qapi/error.h"
  26 #include "qemu.h"
  27 #include "qemu/path.h"
  28 #include "qemu/config-file.h"
  29 #include "qemu/cutils.h"
  30 #include "qemu/error-report.h"
  31 #include "qemu/help_option.h"
  32 #include "cpu.h"
  33 #include "exec/exec-all.h"
  34 #include "tcg.h"
  35 #include "qemu/timer.h"
  36 #include "qemu/envlist.h"
  37 #include "qemu/guest-random.h"
  38 #include "elf.h"
  39 #include "trace/control.h"
  40 #include "target_elf.h"
  41 #include "cpu_loop-common.h"
  42 #include "crypto/init.h"
  43
  44 char *exec_path;
  45
  46 int singlestep;
  47 static const char *filename;
  48 static const char *argv0;
  49 static int gdbstub_port;
  50 static envlist_t *envlist;
  51 static const char *cpu_model;
  52 static const char *cpu_type;
  53 static const char *seed_optarg;
  54 unsigned long mmap_min_addr;
  55 unsigned long guest_base;
  56 int have_guest_base;
  57
  58 /*
  59  * When running 32-on-64 we should make sure we can fit all of the possible
  60  * guest address space into a contiguous chunk of virtual host memory.
  61  *
  62  * This way we will never overlap with our own libraries or binaries or stack
  63  * or anything else that QEMU maps.
  64  *
  65  * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
  66  * of the address for the kernel.  Some cpus rely on this and user space
  67  * uses the high bit(s) for pointer tagging and the like.  For them, we
  68  * must preserve the expected address space.
  69  */
  70 #ifndef MAX_RESERVED_VA
  71 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
  72 #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
  73       (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
  74 /* There are a number of places where we assign reserved_va to a variable
  75    of type abi_ulong and expect it to fit.  Avoid the last page.  */
  76 #   define MAX_RESERVED_VA  (0xfffffffful & TARGET_PAGE_MASK)
  77 #  else
  78 #   define MAX_RESERVED_VA  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
  79 #  endif
  80 # else
  81 #  define MAX_RESERVED_VA  0
  82 # endif
  83 #endif
  84
  85 unsigned long reserved_va;
  86
  87 static void usage(int exitcode);
  88
  89 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
  90 const char *qemu_uname_release;
  91
  92 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
  93    we allocate a bigger stack. Need a better solution, for example
  94    by remapping the process stack directly at the right place */
  95 unsigned long guest_stack_size = 8 * 1024 * 1024UL;
  96
  97 void gemu_log(const char *fmt, ...)
  98 {
  99     va_list ap;
 100
 101     va_start(ap, fmt);
 102     vfprintf(stderr, fmt, ap);
 103     va_end(ap);
 104 }
 105
 106 #if defined(TARGET_I386)
 107 int cpu_get_pic_interrupt(CPUX86State *env)
 108 {
 109     return -1;
 110 }
 111 #endif
 112
 113 /***********************************************************/
 114 /* Helper routines for implementing atomic operations.  */
 115
 116 /* Make sure everything is in a consistent state for calling fork().  */
 117 void fork_start(void)
 118 {
 119     start_exclusive();
 120     mmap_fork_start();
 121     cpu_list_lock();
 122 }
 123
 124 void fork_end(int child)
 125 {
 126     mmap_fork_end(child);
 127     if (child) {
 128         CPUState *cpu, *next_cpu;
 129         /* Child processes created by fork() only have a single thread.
 130            Discard information about the parent threads.  */
 131         CPU_FOREACH_SAFE(cpu, next_cpu) {
 132             if (cpu != thread_cpu) {
 133                 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
 134             }
 135         }
 136         qemu_init_cpu_list();
 137         gdbserver_fork(thread_cpu);
 138         /* qemu_init_cpu_list() takes care of reinitializing the
 139          * exclusive state, so we don't need to end_exclusive() here.
 140          */
 141     } else {
 142         cpu_list_unlock();
 143         end_exclusive();
 144     }
 145 }
 146
 147 __thread CPUState *thread_cpu;
 148
 149 bool qemu_cpu_is_self(CPUState *cpu)
 150 {
 151     return thread_cpu == cpu;
 152 }
 153
 154 void qemu_cpu_kick(CPUState *cpu)
 155 {
 156     cpu_exit(cpu);
 157 }
 158
 159 void task_settid(TaskState *ts)
 160 {
 161     if (ts->ts_tid == 0) {
 162         ts->ts_tid = (pid_t)syscall(SYS_gettid);
 163     }
 164 }
 165
 166 void stop_all_tasks(void)
 167 {
 168     /*
 169      * We trust that when using NPTL, start_exclusive()
 170      * handles thread stopping correctly.
 171      */
 172     start_exclusive();
 173 }
 174
 175 /* Assumes contents are already zeroed.  */
 176 void init_task_state(TaskState *ts)
 177 {
 178     ts->used = 1;
 179 }
 180
 181 CPUArchState *cpu_copy(CPUArchState *env)
 182 {
 183     CPUState *cpu = ENV_GET_CPU(env);
 184     CPUState *new_cpu = cpu_create(cpu_type);
 185     CPUArchState *new_env = new_cpu->env_ptr;
 186     CPUBreakpoint *bp;
 187     CPUWatchpoint *wp;
 188
 189     /* Reset non arch specific state */
 190     cpu_reset(new_cpu);
 191
 192     memcpy(new_env, env, sizeof(CPUArchState));
 193
 194     /* Clone all break/watchpoints.
 195        Note: Once we support ptrace with hw-debug register access, make sure
 196        BP_CPU break/watchpoints are handled correctly on clone. */
 197     QTAILQ_INIT(&new_cpu->breakpoints);
 198     QTAILQ_INIT(&new_cpu->watchpoints);
 199     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 200         cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
 201     }
 202     QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
 203         cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
 204     }
 205
 206     return new_env;
 207 }
 208
 209 static void handle_arg_help(const char *arg)
 210 {
 211     usage(EXIT_SUCCESS);
 212 }
 213
 214 static void handle_arg_log(const char *arg)
 215 {
 216     int mask;
 217
 218     mask = qemu_str_to_log_mask(arg);
 219     if (!mask) {
 220         qemu_print_log_usage(stdout);
 221         exit(EXIT_FAILURE);
 222     }
 223     qemu_log_needs_buffers();
 224     qemu_set_log(mask);
 225 }
 226
 227 static void handle_arg_dfilter(const char *arg)
 228 {
 229     qemu_set_dfilter_ranges(arg, NULL);
 230 }
 231
 232 static void handle_arg_log_filename(const char *arg)
 233 {
 234     qemu_set_log_filename(arg, &error_fatal);
 235 }
 236
 237 static void handle_arg_set_env(const char *arg)
 238 {
 239     char *r, *p, *token;
 240     r = p = strdup(arg);
 241     while ((token = strsep(&p, ",")) != NULL) {
 242         if (envlist_setenv(envlist, token) != 0) {
 243             usage(EXIT_FAILURE);
 244         }
 245     }
 246     free(r);
 247 }
 248
 249 static void handle_arg_unset_env(const char *arg)
 250 {
 251     char *r, *p, *token;
 252     r = p = strdup(arg);
 253     while ((token = strsep(&p, ",")) != NULL) {
 254         if (envlist_unsetenv(envlist, token) != 0) {
 255             usage(EXIT_FAILURE);
 256         }
 257     }
 258     free(r);
 259 }
 260
 261 static void handle_arg_argv0(const char *arg)
 262 {
 263     argv0 = strdup(arg);
 264 }
 265
 266 static void handle_arg_stack_size(const char *arg)
 267 {
 268     char *p;
 269     guest_stack_size = strtoul(arg, &p, 0);
 270     if (guest_stack_size == 0) {
 271         usage(EXIT_FAILURE);
 272     }
 273
 274     if (*p == 'M') {
 275         guest_stack_size *= MiB;
 276     } else if (*p == 'k' || *p == 'K') {
 277         guest_stack_size *= KiB;
 278     }
 279 }
 280
 281 static void handle_arg_ld_prefix(const char *arg)
 282 {
 283     interp_prefix = strdup(arg);
 284 }
 285
 286 static void handle_arg_pagesize(const char *arg)
 287 {
 288     qemu_host_page_size = atoi(arg);
 289     if (qemu_host_page_size == 0 ||
 290         (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 291         fprintf(stderr, "page size must be a power of two\n");
 292         exit(EXIT_FAILURE);
 293     }
 294 }
 295
 296 static void handle_arg_seed(const char *arg)
 297 {
 298     seed_optarg = arg;
 299 }
 300
 301 static void handle_arg_gdb(const char *arg)
 302 {
 303     gdbstub_port = atoi(arg);
 304 }
 305
 306 static void handle_arg_uname(const char *arg)
 307 {
 308     qemu_uname_release = strdup(arg);
 309 }
 310
 311 static void handle_arg_cpu(const char *arg)
 312 {
 313     cpu_model = strdup(arg);
 314     if (cpu_model == NULL || is_help_option(cpu_model)) {
 315         /* XXX: implement xxx_cpu_list for targets that still miss it */
 316 #if defined(cpu_list)
 317         cpu_list();
 318 #endif
 319         exit(EXIT_FAILURE);
 320     }
 321 }
 322
 323 static void handle_arg_guest_base(const char *arg)
 324 {
 325     guest_base = strtol(arg, NULL, 0);
 326     have_guest_base = 1;
 327 }
 328
 329 static void handle_arg_reserved_va(const char *arg)
 330 {
 331     char *p;
 332     int shift = 0;
 333     reserved_va = strtoul(arg, &p, 0);
 334     switch (*p) {
 335     case 'k':
 336     case 'K':
 337         shift = 10;
 338         break;
 339     case 'M':
 340         shift = 20;
 341         break;
 342     case 'G':
 343         shift = 30;
 344         break;
 345     }
 346     if (shift) {
 347         unsigned long unshifted = reserved_va;
 348         p++;
 349         reserved_va <<= shift;
 350         if (reserved_va >> shift != unshifted
 351             || (MAX_RESERVED_VA && reserved_va > MAX_RESERVED_VA)) {
 352             fprintf(stderr, "Reserved virtual address too big\n");
 353             exit(EXIT_FAILURE);
 354         }
 355     }
 356     if (*p) {
 357         fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
 358         exit(EXIT_FAILURE);
 359     }
 360 }
 361
 362 static void handle_arg_singlestep(const char *arg)
 363 {
 364     singlestep = 1;
 365 }
 366
 367 static void handle_arg_strace(const char *arg)
 368 {
 369     do_strace = 1;
 370 }
 371
 372 static void handle_arg_version(const char *arg)
 373 {
 374     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
 375            "\n" QEMU_COPYRIGHT "\n");
 376     exit(EXIT_SUCCESS);
 377 }
 378
 379 static char *trace_file;
 380 static void handle_arg_trace(const char *arg)
 381 {
 382     g_free(trace_file);
 383     trace_file = trace_opt_parse(arg);
 384 }
 385
 386 struct qemu_argument {
 387     const char *argv;
 388     const char *env;
 389     bool has_arg;
 390     void (*handle_opt)(const char *arg);
 391     const char *example;
 392     const char *help;
 393 };
 394
 395 static const struct qemu_argument arg_table[] = {
 396     {"h",          "",                 false, handle_arg_help,
 397      "",           "print this help"},
 398     {"help",       "",                 false, handle_arg_help,
 399      "",           ""},
 400     {"g",          "QEMU_GDB",         true,  handle_arg_gdb,
 401      "port",       "wait gdb connection to 'port'"},
 402     {"L",          "QEMU_LD_PREFIX",   true,  handle_arg_ld_prefix,
 403      "path",       "set the elf interpreter prefix to 'path'"},
 404     {"s",          "QEMU_STACK_SIZE",  true,  handle_arg_stack_size,
 405      "size",       "set the stack size to 'size' bytes"},
 406     {"cpu",        "QEMU_CPU",         true,  handle_arg_cpu,
 407      "model",      "select CPU (-cpu help for list)"},
 408     {"E",          "QEMU_SET_ENV",     true,  handle_arg_set_env,
 409      "var=value",  "sets targets environment variable (see below)"},
 410     {"U",          "QEMU_UNSET_ENV",   true,  handle_arg_unset_env,
 411      "var",        "unsets targets environment variable (see below)"},
 412     {"0",          "QEMU_ARGV0",       true,  handle_arg_argv0,
 413      "argv0",      "forces target process argv[0] to be 'argv0'"},
 414     {"r",          "QEMU_UNAME",       true,  handle_arg_uname,
 415      "uname",      "set qemu uname release string to 'uname'"},
 416     {"B",          "QEMU_GUEST_BASE",  true,  handle_arg_guest_base,
 417      "address",    "set guest_base address to 'address'"},
 418     {"R",          "QEMU_RESERVED_VA", true,  handle_arg_reserved_va,
 419      "size",       "reserve 'size' bytes for guest virtual address space"},
 420     {"d",          "QEMU_LOG",         true,  handle_arg_log,
 421      "item[,...]", "enable logging of specified items "
 422      "(use '-d help' for a list of items)"},
 423     {"dfilter",    "QEMU_DFILTER",     true,  handle_arg_dfilter,
 424      "range[,...]","filter logging based on address range"},
 425     {"D",          "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
 426      "logfile",     "write logs to 'logfile' (default stderr)"},
 427     {"p",          "QEMU_PAGESIZE",    true,  handle_arg_pagesize,
 428      "pagesize",   "set the host page size to 'pagesize'"},
 429     {"singlestep", "QEMU_SINGLESTEP",  false, handle_arg_singlestep,
 430      "",           "run in singlestep mode"},
 431     {"strace",     "QEMU_STRACE",      false, handle_arg_strace,
 432      "",           "log system calls"},
 433     {"seed",       "QEMU_RAND_SEED",   true,  handle_arg_seed,
 434      "",           "Seed for pseudo-random number generator"},
 435     {"trace",      "QEMU_TRACE",       true,  handle_arg_trace,
 436      "",           "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
 437     {"version",    "QEMU_VERSION",     false, handle_arg_version,
 438      "",           "display version information and exit"},
 439     {NULL, NULL, false, NULL, NULL, NULL}
 440 };
 441
 442 static void usage(int exitcode)
 443 {
 444     const struct qemu_argument *arginfo;
 445     int maxarglen;
 446     int maxenvlen;
 447
 448     printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
 449            "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
 450            "\n"
 451            "Options and associated environment variables:\n"
 452            "\n");
 453
 454     /* Calculate column widths. We must always have at least enough space
 455      * for the column header.
 456      */
 457     maxarglen = strlen("Argument");
 458     maxenvlen = strlen("Env-variable");
 459
 460     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 461         int arglen = strlen(arginfo->argv);
 462         if (arginfo->has_arg) {
 463             arglen += strlen(arginfo->example) + 1;
 464         }
 465         if (strlen(arginfo->env) > maxenvlen) {
 466             maxenvlen = strlen(arginfo->env);
 467         }
 468         if (arglen > maxarglen) {
 469             maxarglen = arglen;
 470         }
 471     }
 472
 473     printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
 474             maxenvlen, "Env-variable");
 475
 476     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 477         if (arginfo->has_arg) {
 478             printf("-%s %-*s %-*s %s\n", arginfo->argv,
 479                    (int)(maxarglen - strlen(arginfo->argv) - 1),
 480                    arginfo->example, maxenvlen, arginfo->env, arginfo->help);
 481         } else {
 482             printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
 483                     maxenvlen, arginfo->env,
 484                     arginfo->help);
 485         }
 486     }
 487
 488     printf("\n"
 489            "Defaults:\n"
 490            "QEMU_LD_PREFIX  = %s\n"
 491            "QEMU_STACK_SIZE = %ld byte\n",
 492            interp_prefix,
 493            guest_stack_size);
 494
 495     printf("\n"
 496            "You can use -E and -U options or the QEMU_SET_ENV and\n"
 497            "QEMU_UNSET_ENV environment variables to set and unset\n"
 498            "environment variables for the target process.\n"
 499            "It is possible to provide several variables by separating them\n"
 500            "by commas in getsubopt(3) style. Additionally it is possible to\n"
 501            "provide the -E and -U options multiple times.\n"
 502            "The following lines are equivalent:\n"
 503            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 504            "    -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
 505            "    QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
 506            "Note that if you provide several changes to a single variable\n"
 507            "the last change will stay in effect.\n"
 508            "\n"
 509            QEMU_HELP_BOTTOM "\n");
 510
 511     exit(exitcode);
 512 }
 513
 514 static int parse_args(int argc, char **argv)
 515 {
 516     const char *r;
 517     int optind;
 518     const struct qemu_argument *arginfo;
 519
 520     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 521         if (arginfo->env == NULL) {
 522             continue;
 523         }
 524
 525         r = getenv(arginfo->env);
 526         if (r != NULL) {
 527             arginfo->handle_opt(r);
 528         }
 529     }
 530
 531     optind = 1;
 532     for (;;) {
 533         if (optind >= argc) {
 534             break;
 535         }
 536         r = argv[optind];
 537         if (r[0] != '-') {
 538             break;
 539         }
 540         optind++;
 541         r++;
 542         if (!strcmp(r, "-")) {
 543             break;
 544         }
 545         /* Treat --foo the same as -foo.  */
 546         if (r[0] == '-') {
 547             r++;
 548         }
 549
 550         for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 551             if (!strcmp(r, arginfo->argv)) {
 552                 if (arginfo->has_arg) {
 553                     if (optind >= argc) {
 554                         (void) fprintf(stderr,
 555                             "qemu: missing argument for option '%s'\n", r);
 556                         exit(EXIT_FAILURE);
 557                     }
 558                     arginfo->handle_opt(argv[optind]);
 559                     optind++;
 560                 } else {
 561                     arginfo->handle_opt(NULL);
 562                 }
 563                 break;
 564             }
 565         }
 566
 567         /* no option matched the current argv */
 568         if (arginfo->handle_opt == NULL) {
 569             (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
 570             exit(EXIT_FAILURE);
 571         }
 572     }
 573
 574     if (optind >= argc) {
 575         (void) fprintf(stderr, "qemu: no user program specified\n");
 576         exit(EXIT_FAILURE);
 577     }
 578
 579     filename = argv[optind];
 580     exec_path = argv[optind];
 581
 582     return optind;
 583 }
 584
 585 int main(int argc, char **argv, char **envp)
 586 {
 587     struct target_pt_regs regs1, *regs = &regs1;
 588     struct image_info info1, *info = &info1;
 589     struct linux_binprm bprm;
 590     TaskState *ts;
 591     CPUArchState *env;
 592     CPUState *cpu;
 593     int optind;
 594     char **target_environ, **wrk;
 595     char **target_argv;
 596     int target_argc;
 597     int i;
 598     int ret;
 599     int execfd;
 600
 601     error_init(argv[0]);
 602     module_call_init(MODULE_INIT_TRACE);
 603     qemu_init_cpu_list();
 604     module_call_init(MODULE_INIT_QOM);
 605
 606     envlist = envlist_create();
 607
 608     /* add current environment into the list */
 609     for (wrk = environ; *wrk != NULL; wrk++) {
 610         (void) envlist_setenv(envlist, *wrk);
 611     }
 612
 613     /* Read the stack limit from the kernel.  If it's "unlimited",
 614        then we can do little else besides use the default.  */
 615     {
 616         struct rlimit lim;
 617         if (getrlimit(RLIMIT_STACK, &lim) == 0
 618             && lim.rlim_cur != RLIM_INFINITY
 619             && lim.rlim_cur == (target_long)lim.rlim_cur) {
 620             guest_stack_size = lim.rlim_cur;
 621         }
 622     }
 623
 624     cpu_model = NULL;
 625
 626     qemu_add_opts(&qemu_trace_opts);
 627
 628     optind = parse_args(argc, argv);
 629
 630     if (!trace_init_backends()) {
 631         exit(1);
 632     }
 633     trace_init_file(trace_file);
 634
 635     /* Zero out regs */
 636     memset(regs, 0, sizeof(struct target_pt_regs));
 637
 638     /* Zero out image_info */
 639     memset(info, 0, sizeof(struct image_info));
 640
 641     memset(&bprm, 0, sizeof (bprm));
 642
 643     /* Scan interp_prefix dir for replacement files. */
 644     init_paths(interp_prefix);
 645
 646     init_qemu_uname_release();
 647
 648     execfd = qemu_getauxval(AT_EXECFD);
 649     if (execfd == 0) {
 650         execfd = open(filename, O_RDONLY);
 651         if (execfd < 0) {
 652             printf("Error while loading %s: %s\n", filename, strerror(errno));
 653             _exit(EXIT_FAILURE);
 654         }
 655     }
 656
 657     if (cpu_model == NULL) {
 658         cpu_model = cpu_get_model(get_elf_eflags(execfd));
 659     }
 660     cpu_type = parse_cpu_option(cpu_model);
 661
 662     /* init tcg before creating CPUs and to get qemu_host_page_size */
 663     tcg_exec_init(0);
 664
 665     /* Reserving *too* much vm space via mmap can run into problems
 666        with rlimits, oom due to page table creation, etc.  We will still try it,
 667        if directed by the command-line option, but not by default.  */
 668     if (HOST_LONG_BITS == 64 &&
 669         TARGET_VIRT_ADDR_SPACE_BITS <= 32 &&
 670         reserved_va == 0) {
 671         /* reserved_va must be aligned with the host page size
 672          * as it is used with mmap()
 673          */
 674         reserved_va = MAX_RESERVED_VA & qemu_host_page_mask;
 675     }
 676
 677     cpu = cpu_create(cpu_type);
 678     env = cpu->env_ptr;
 679     cpu_reset(cpu);
 680
 681     thread_cpu = cpu;
 682
 683     if (getenv("QEMU_STRACE")) {
 684         do_strace = 1;
 685     }
 686
 687     if (seed_optarg == NULL) {
 688         seed_optarg = getenv("QEMU_RAND_SEED");
 689     }
 690     {
 691         Error *err = NULL;
 692         if (seed_optarg != NULL) {
 693             qemu_guest_random_seed_main(seed_optarg, &err);
 694         } else {
 695             qcrypto_init(&err);
 696         }
 697         if (err) {
 698             error_reportf_err(err, "cannot initialize crypto: ");
 699             exit(1);
 700         }
 701     }
 702
 703     target_environ = envlist_to_environ(envlist, NULL);
 704     envlist_free(envlist);
 705
 706     /*
 707      * Now that page sizes are configured in tcg_exec_init() we can do
 708      * proper page alignment for guest_base.
 709      */
 710     guest_base = HOST_PAGE_ALIGN(guest_base);
 711
 712     if (reserved_va || have_guest_base) {
 713         guest_base = init_guest_space(guest_base, reserved_va, 0,
 714                                       have_guest_base);
 715         if (guest_base == (unsigned long)-1) {
 716             fprintf(stderr, "Unable to reserve 0x%lx bytes of virtual address "
 717                     "space for use as guest address space (check your virtual "
 718                     "memory ulimit setting or reserve less using -R option)\n",
 719                     reserved_va);
 720             exit(EXIT_FAILURE);
 721         }
 722
 723         if (reserved_va) {
 724             mmap_next_start = reserved_va;
 725         }
 726     }
 727
 728     /*
 729      * Read in mmap_min_addr kernel parameter.  This value is used
 730      * When loading the ELF image to determine whether guest_base
 731      * is needed.  It is also used in mmap_find_vma.
 732      */
 733     {
 734         FILE *fp;
 735
 736         if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
 737             unsigned long tmp;
 738             if (fscanf(fp, "%lu", &tmp) == 1) {
 739                 mmap_min_addr = tmp;
 740                 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", mmap_min_addr);
 741             }
 742             fclose(fp);
 743         }
 744     }
 745
 746     /*
 747      * Prepare copy of argv vector for target.
 748      */
 749     target_argc = argc - optind;
 750     target_argv = calloc(target_argc + 1, sizeof (char *));
 751     if (target_argv == NULL) {
 752         (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
 753         exit(EXIT_FAILURE);
 754     }
 755
 756     /*
 757      * If argv0 is specified (using '-0' switch) we replace
 758      * argv[0] pointer with the given one.
 759      */
 760     i = 0;
 761     if (argv0 != NULL) {
 762         target_argv[i++] = strdup(argv0);
 763     }
 764     for (; i < target_argc; i++) {
 765         target_argv[i] = strdup(argv[optind + i]);
 766     }
 767     target_argv[target_argc] = NULL;
 768
 769     ts = g_new0(TaskState, 1);
 770     init_task_state(ts);
 771     /* build Task State */
 772     ts->info = info;
 773     ts->bprm = &bprm;
 774     cpu->opaque = ts;
 775     task_settid(ts);
 776
 777     ret = loader_exec(execfd, filename, target_argv, target_environ, regs,
 778         info, &bprm);
 779     if (ret != 0) {
 780         printf("Error while loading %s: %s\n", filename, strerror(-ret));
 781         _exit(EXIT_FAILURE);
 782     }
 783
 784     for (wrk = target_environ; *wrk; wrk++) {
 785         g_free(*wrk);
 786     }
 787
 788     g_free(target_environ);
 789
 790     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 791         qemu_log("guest_base  0x%lx\n", guest_base);
 792         log_page_dump();
 793
 794         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 795         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 796         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n", info->start_code);
 797         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n", info->start_data);
 798         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 799         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
 800         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 801         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 802         qemu_log("argv_start  0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
 803         qemu_log("env_start   0x" TARGET_ABI_FMT_lx "\n",
 804                  info->arg_end + (abi_ulong)sizeof(abi_ulong));
 805         qemu_log("auxv_start  0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
 806     }
 807
 808     target_set_brk(info->brk);
 809     syscall_init();
 810     signal_init();
 811
 812     /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 813        generating the prologue until now so that the prologue can take
 814        the real value of GUEST_BASE into account.  */
 815     tcg_prologue_init(tcg_ctx);
 816     tcg_region_init();
 817
 818     target_cpu_copy_regs(env, regs);
 819
 820     if (gdbstub_port) {
 821         if (gdbserver_start(gdbstub_port) < 0) {
 822             fprintf(stderr, "qemu: could not open gdbserver on port %d\n",
 823                     gdbstub_port);
 824             exit(EXIT_FAILURE);
 825         }
 826         gdb_handlesig(cpu, 0);
 827     }
 828     cpu_loop(env);
 829     /* never exits */
 830     return 0;
 831 }