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 "sysemu/tcg.h"
  24 #include "qemu-version.h"
  25 #include <sys/syscall.h>
  26 #include <sys/resource.h>
  27
  28 #include "qapi/error.h"
  29 #include "qemu.h"
  30 #include "qemu/path.h"
  31 #include "qemu/config-file.h"
  32 #include "qemu/cutils.h"
  33 #include "qemu/error-report.h"
  34 #include "qemu/help_option.h"
  35 #include "qemu/module.h"
  36 #include "cpu.h"
  37 #include "exec/exec-all.h"
  38 #include "tcg.h"
  39 #include "qemu/timer.h"
  40 #include "qemu/envlist.h"
  41 #include "qemu/guest-random.h"
  42 #include "elf.h"
  43 #include "trace/control.h"
  44 #include "target_elf.h"
  45 #include "cpu_loop-common.h"
  46 #include "crypto/init.h"
  47
  48 char *exec_path;
  49
  50 int singlestep;
  51 static const char *filename;
  52 static const char *argv0;
  53 static int gdbstub_port;
  54 static envlist_t *envlist;
  55 static const char *cpu_model;
  56 static const char *cpu_type;
  57 static const char *seed_optarg;
  58 unsigned long mmap_min_addr;
  59 unsigned long guest_base;
  60 int have_guest_base;
  61
  62 /*
  63  * When running 32-on-64 we should make sure we can fit all of the possible
  64  * guest address space into a contiguous chunk of virtual host memory.
  65  *
  66  * This way we will never overlap with our own libraries or binaries or stack
  67  * or anything else that QEMU maps.
  68  *
  69  * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
  70  * of the address for the kernel.  Some cpus rely on this and user space
  71  * uses the high bit(s) for pointer tagging and the like.  For them, we
  72  * must preserve the expected address space.
  73  */
  74 #ifndef MAX_RESERVED_VA
  75 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
  76 #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
  77       (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
  78 /* There are a number of places where we assign reserved_va to a variable
  79    of type abi_ulong and expect it to fit.  Avoid the last page.  */
  80 #   define MAX_RESERVED_VA  (0xfffffffful & TARGET_PAGE_MASK)
  81 #  else
  82 #   define MAX_RESERVED_VA  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
  83 #  endif
  84 # else
  85 #  define MAX_RESERVED_VA  0
  86 # endif
  87 #endif
  88
  89 unsigned long reserved_va;
  90
  91 static void usage(int exitcode);
  92
  93 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
  94 const char *qemu_uname_release;
  95
  96 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
  97    we allocate a bigger stack. Need a better solution, for example
  98    by remapping the process stack directly at the right place */
  99 unsigned long guest_stack_size = 8 * 1024 * 1024UL;
 100
 101 void gemu_log(const char *fmt, ...)
 102 {
 103     va_list ap;
 104
 105     va_start(ap, fmt);
 106     vfprintf(stderr, fmt, ap);
 107     va_end(ap);
 108 }
 109
 110 #if defined(TARGET_I386)
 111 int cpu_get_pic_interrupt(CPUX86State *env)
 112 {
 113     return -1;
 114 }
 115 #endif
 116
 117 /***********************************************************/
 118 /* Helper routines for implementing atomic operations.  */
 119
 120 /* Make sure everything is in a consistent state for calling fork().  */
 121 void fork_start(void)
 122 {
 123     start_exclusive();
 124     mmap_fork_start();
 125     cpu_list_lock();
 126 }
 127
 128 void fork_end(int child)
 129 {
 130     mmap_fork_end(child);
 131     if (child) {
 132         CPUState *cpu, *next_cpu;
 133         /* Child processes created by fork() only have a single thread.
 134            Discard information about the parent threads.  */
 135         CPU_FOREACH_SAFE(cpu, next_cpu) {
 136             if (cpu != thread_cpu) {
 137                 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
 138             }
 139         }
 140         qemu_init_cpu_list();
 141         gdbserver_fork(thread_cpu);
 142         /* qemu_init_cpu_list() takes care of reinitializing the
 143          * exclusive state, so we don't need to end_exclusive() here.
 144          */
 145     } else {
 146         cpu_list_unlock();
 147         end_exclusive();
 148     }
 149 }
 150
 151 __thread CPUState *thread_cpu;
 152
 153 bool qemu_cpu_is_self(CPUState *cpu)
 154 {
 155     return thread_cpu == cpu;
 156 }
 157
 158 void qemu_cpu_kick(CPUState *cpu)
 159 {
 160     cpu_exit(cpu);
 161 }
 162
 163 void task_settid(TaskState *ts)
 164 {
 165     if (ts->ts_tid == 0) {
 166         ts->ts_tid = (pid_t)syscall(SYS_gettid);
 167     }
 168 }
 169
 170 void stop_all_tasks(void)
 171 {
 172     /*
 173      * We trust that when using NPTL, start_exclusive()
 174      * handles thread stopping correctly.
 175      */
 176     start_exclusive();
 177 }
 178
 179 /* Assumes contents are already zeroed.  */
 180 void init_task_state(TaskState *ts)
 181 {
 182     ts->used = 1;
 183     ts->sigaltstack_used = (struct target_sigaltstack) {
 184         .ss_sp = 0,
 185         .ss_size = 0,
 186         .ss_flags = TARGET_SS_DISABLE,
 187     };
 188 }
 189
 190 CPUArchState *cpu_copy(CPUArchState *env)
 191 {
 192     CPUState *cpu = env_cpu(env);
 193     CPUState *new_cpu = cpu_create(cpu_type);
 194     CPUArchState *new_env = new_cpu->env_ptr;
 195     CPUBreakpoint *bp;
 196     CPUWatchpoint *wp;
 197
 198     /* Reset non arch specific state */
 199     cpu_reset(new_cpu);
 200
 201     memcpy(new_env, env, sizeof(CPUArchState));
 202
 203     /* Clone all break/watchpoints.
 204        Note: Once we support ptrace with hw-debug register access, make sure
 205        BP_CPU break/watchpoints are handled correctly on clone. */
 206     QTAILQ_INIT(&new_cpu->breakpoints);
 207     QTAILQ_INIT(&new_cpu->watchpoints);
 208     QTAILQ_FOREACH(bp, &cpu->breakpoints, entry) {
 209         cpu_breakpoint_insert(new_cpu, bp->pc, bp->flags, NULL);
 210     }
 211     QTAILQ_FOREACH(wp, &cpu->watchpoints, entry) {
 212         cpu_watchpoint_insert(new_cpu, wp->vaddr, wp->len, wp->flags, NULL);
 213     }
 214
 215     return new_env;
 216 }
 217
 218 static void handle_arg_help(const char *arg)
 219 {
 220     usage(EXIT_SUCCESS);
 221 }
 222
 223 static void handle_arg_log(const char *arg)
 224 {
 225     int mask;
 226
 227     mask = qemu_str_to_log_mask(arg);
 228     if (!mask) {
 229         qemu_print_log_usage(stdout);
 230         exit(EXIT_FAILURE);
 231     }
 232     qemu_log_needs_buffers();
 233     qemu_set_log(mask);
 234 }
 235
 236 static void handle_arg_dfilter(const char *arg)
 237 {
 238     qemu_set_dfilter_ranges(arg, NULL);
 239 }
 240
 241 static void handle_arg_log_filename(const char *arg)
 242 {
 243     qemu_set_log_filename(arg, &error_fatal);
 244 }
 245
 246 static void handle_arg_set_env(const char *arg)
 247 {
 248     char *r, *p, *token;
 249     r = p = strdup(arg);
 250     while ((token = strsep(&p, ",")) != NULL) {
 251         if (envlist_setenv(envlist, token) != 0) {
 252             usage(EXIT_FAILURE);
 253         }
 254     }
 255     free(r);
 256 }
 257
 258 static void handle_arg_unset_env(const char *arg)
 259 {
 260     char *r, *p, *token;
 261     r = p = strdup(arg);
 262     while ((token = strsep(&p, ",")) != NULL) {
 263         if (envlist_unsetenv(envlist, token) != 0) {
 264             usage(EXIT_FAILURE);
 265         }
 266     }
 267     free(r);
 268 }
 269
 270 static void handle_arg_argv0(const char *arg)
 271 {
 272     argv0 = strdup(arg);
 273 }
 274
 275 static void handle_arg_stack_size(const char *arg)
 276 {
 277     char *p;
 278     guest_stack_size = strtoul(arg, &p, 0);
 279     if (guest_stack_size == 0) {
 280         usage(EXIT_FAILURE);
 281     }
 282
 283     if (*p == 'M') {
 284         guest_stack_size *= MiB;
 285     } else if (*p == 'k' || *p == 'K') {
 286         guest_stack_size *= KiB;
 287     }
 288 }
 289
 290 static void handle_arg_ld_prefix(const char *arg)
 291 {
 292     interp_prefix = strdup(arg);
 293 }
 294
 295 static void handle_arg_pagesize(const char *arg)
 296 {
 297     qemu_host_page_size = atoi(arg);
 298     if (qemu_host_page_size == 0 ||
 299         (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 300         fprintf(stderr, "page size must be a power of two\n");
 301         exit(EXIT_FAILURE);
 302     }
 303 }
 304
 305 static void handle_arg_seed(const char *arg)
 306 {
 307     seed_optarg = arg;
 308 }
 309
 310 static void handle_arg_gdb(const char *arg)
 311 {
 312     gdbstub_port = atoi(arg);
 313 }
 314
 315 static void handle_arg_uname(const char *arg)
 316 {
 317     qemu_uname_release = strdup(arg);
 318 }
 319
 320 static void handle_arg_cpu(const char *arg)
 321 {
 322     cpu_model = strdup(arg);
 323     if (cpu_model == NULL || is_help_option(cpu_model)) {
 324         /* XXX: implement xxx_cpu_list for targets that still miss it */
 325 #if defined(cpu_list)
 326         cpu_list();
 327 #endif
 328         exit(EXIT_FAILURE);
 329     }
 330 }
 331
 332 static void handle_arg_guest_base(const char *arg)
 333 {
 334     guest_base = strtol(arg, NULL, 0);
 335     have_guest_base = 1;
 336 }
 337
 338 static void handle_arg_reserved_va(const char *arg)
 339 {
 340     char *p;
 341     int shift = 0;
 342     reserved_va = strtoul(arg, &p, 0);
 343     switch (*p) {
 344     case 'k':
 345     case 'K':
 346         shift = 10;
 347         break;
 348     case 'M':
 349         shift = 20;
 350         break;
 351     case 'G':
 352         shift = 30;
 353         break;
 354     }
 355     if (shift) {
 356         unsigned long unshifted = reserved_va;
 357         p++;
 358         reserved_va <<= shift;
 359         if (reserved_va >> shift != unshifted
 360             || (MAX_RESERVED_VA && reserved_va > MAX_RESERVED_VA)) {
 361             fprintf(stderr, "Reserved virtual address too big\n");
 362             exit(EXIT_FAILURE);
 363         }
 364     }
 365     if (*p) {
 366         fprintf(stderr, "Unrecognised -R size suffix '%s'\n", p);
 367         exit(EXIT_FAILURE);
 368     }
 369 }
 370
 371 static void handle_arg_singlestep(const char *arg)
 372 {
 373     singlestep = 1;
 374 }
 375
 376 static void handle_arg_strace(const char *arg)
 377 {
 378     do_strace = 1;
 379 }
 380
 381 static void handle_arg_version(const char *arg)
 382 {
 383     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
 384            "\n" QEMU_COPYRIGHT "\n");
 385     exit(EXIT_SUCCESS);
 386 }
 387
 388 static char *trace_file;
 389 static void handle_arg_trace(const char *arg)
 390 {
 391     g_free(trace_file);
 392     trace_file = trace_opt_parse(arg);
 393 }
 394
 395 struct qemu_argument {
 396     const char *argv;
 397     const char *env;
 398     bool has_arg;
 399     void (*handle_opt)(const char *arg);
 400     const char *example;
 401     const char *help;
 402 };
 403
 404 static const struct qemu_argument arg_table[] = {
 405     {"h",          "",                 false, handle_arg_help,
 406      "",           "print this help"},
 407     {"help",       "",                 false, handle_arg_help,
 408      "",           ""},
 409     {"g",          "QEMU_GDB",         true,  handle_arg_gdb,
 410      "port",       "wait gdb connection to 'port'"},
 411     {"L",          "QEMU_LD_PREFIX",   true,  handle_arg_ld_prefix,
 412      "path",       "set the elf interpreter prefix to 'path'"},
 413     {"s",          "QEMU_STACK_SIZE",  true,  handle_arg_stack_size,
 414      "size",       "set the stack size to 'size' bytes"},
 415     {"cpu",        "QEMU_CPU",         true,  handle_arg_cpu,
 416      "model",      "select CPU (-cpu help for list)"},
 417     {"E",          "QEMU_SET_ENV",     true,  handle_arg_set_env,
 418      "var=value",  "sets targets environment variable (see below)"},
 419     {"U",          "QEMU_UNSET_ENV",   true,  handle_arg_unset_env,
 420      "var",        "unsets targets environment variable (see below)"},
 421     {"0",          "QEMU_ARGV0",       true,  handle_arg_argv0,
 422      "argv0",      "forces target process argv[0] to be 'argv0'"},
 423     {"r",          "QEMU_UNAME",       true,  handle_arg_uname,
 424      "uname",      "set qemu uname release string to 'uname'"},
 425     {"B",          "QEMU_GUEST_BASE",  true,  handle_arg_guest_base,
 426      "address",    "set guest_base address to 'address'"},
 427     {"R",          "QEMU_RESERVED_VA", true,  handle_arg_reserved_va,
 428      "size",       "reserve 'size' bytes for guest virtual address space"},
 429     {"d",          "QEMU_LOG",         true,  handle_arg_log,
 430      "item[,...]", "enable logging of specified items "
 431      "(use '-d help' for a list of items)"},
 432     {"dfilter",    "QEMU_DFILTER",     true,  handle_arg_dfilter,
 433      "range[,...]","filter logging based on address range"},
 434     {"D",          "QEMU_LOG_FILENAME", true, handle_arg_log_filename,
 435      "logfile",     "write logs to 'logfile' (default stderr)"},
 436     {"p",          "QEMU_PAGESIZE",    true,  handle_arg_pagesize,
 437      "pagesize",   "set the host page size to 'pagesize'"},
 438     {"singlestep", "QEMU_SINGLESTEP",  false, handle_arg_singlestep,
 439      "",           "run in singlestep mode"},
 440     {"strace",     "QEMU_STRACE",      false, handle_arg_strace,
 441      "",           "log system calls"},
 442     {"seed",       "QEMU_RAND_SEED",   true,  handle_arg_seed,
 443      "",           "Seed for pseudo-random number generator"},
 444     {"trace",      "QEMU_TRACE",       true,  handle_arg_trace,
 445      "",           "[[enable=]<pattern>][,events=<file>][,file=<file>]"},
 446     {"version",    "QEMU_VERSION",     false, handle_arg_version,
 447      "",           "display version information and exit"},
 448     {NULL, NULL, false, NULL, NULL, NULL}
 449 };
 450
 451 static void usage(int exitcode)
 452 {
 453     const struct qemu_argument *arginfo;
 454     int maxarglen;
 455     int maxenvlen;
 456
 457     printf("usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
 458            "Linux CPU emulator (compiled for " TARGET_NAME " emulation)\n"
 459            "\n"
 460            "Options and associated environment variables:\n"
 461            "\n");
 462
 463     /* Calculate column widths. We must always have at least enough space
 464      * for the column header.
 465      */
 466     maxarglen = strlen("Argument");
 467     maxenvlen = strlen("Env-variable");
 468
 469     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 470         int arglen = strlen(arginfo->argv);
 471         if (arginfo->has_arg) {
 472             arglen += strlen(arginfo->example) + 1;
 473         }
 474         if (strlen(arginfo->env) > maxenvlen) {
 475             maxenvlen = strlen(arginfo->env);
 476         }
 477         if (arglen > maxarglen) {
 478             maxarglen = arglen;
 479         }
 480     }
 481
 482     printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
 483             maxenvlen, "Env-variable");
 484
 485     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 486         if (arginfo->has_arg) {
 487             printf("-%s %-*s %-*s %s\n", arginfo->argv,
 488                    (int)(maxarglen - strlen(arginfo->argv) - 1),
 489                    arginfo->example, maxenvlen, arginfo->env, arginfo->help);
 490         } else {
 491             printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
 492                     maxenvlen, arginfo->env,
 493                     arginfo->help);
 494         }
 495     }
 496
 497     printf("\n"
 498            "Defaults:\n"
 499            "QEMU_LD_PREFIX  = %s\n"
 500            "QEMU_STACK_SIZE = %ld byte\n",
 501            interp_prefix,
 502            guest_stack_size);
 503
 504     printf("\n"
 505            "You can use -E and -U options or the QEMU_SET_ENV and\n"
 506            "QEMU_UNSET_ENV environment variables to set and unset\n"
 507            "environment variables for the target process.\n"
 508            "It is possible to provide several variables by separating them\n"
 509            "by commas in getsubopt(3) style. Additionally it is possible to\n"
 510            "provide the -E and -U options multiple times.\n"
 511            "The following lines are equivalent:\n"
 512            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 513            "    -E var1=val2,var2=val2 -U LD_PRELOAD,LD_DEBUG\n"
 514            "    QEMU_SET_ENV=var1=val2,var2=val2 QEMU_UNSET_ENV=LD_PRELOAD,LD_DEBUG\n"
 515            "Note that if you provide several changes to a single variable\n"
 516            "the last change will stay in effect.\n"
 517            "\n"
 518            QEMU_HELP_BOTTOM "\n");
 519
 520     exit(exitcode);
 521 }
 522
 523 static int parse_args(int argc, char **argv)
 524 {
 525     const char *r;
 526     int optind;
 527     const struct qemu_argument *arginfo;
 528
 529     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 530         if (arginfo->env == NULL) {
 531             continue;
 532         }
 533
 534         r = getenv(arginfo->env);
 535         if (r != NULL) {
 536             arginfo->handle_opt(r);
 537         }
 538     }
 539
 540     optind = 1;
 541     for (;;) {
 542         if (optind >= argc) {
 543             break;
 544         }
 545         r = argv[optind];
 546         if (r[0] != '-') {
 547             break;
 548         }
 549         optind++;
 550         r++;
 551         if (!strcmp(r, "-")) {
 552             break;
 553         }
 554         /* Treat --foo the same as -foo.  */
 555         if (r[0] == '-') {
 556             r++;
 557         }
 558
 559         for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
 560             if (!strcmp(r, arginfo->argv)) {
 561                 if (arginfo->has_arg) {
 562                     if (optind >= argc) {
 563                         (void) fprintf(stderr,
 564                             "qemu: missing argument for option '%s'\n", r);
 565                         exit(EXIT_FAILURE);
 566                     }
 567                     arginfo->handle_opt(argv[optind]);
 568                     optind++;
 569                 } else {
 570                     arginfo->handle_opt(NULL);
 571                 }
 572                 break;
 573             }
 574         }
 575
 576         /* no option matched the current argv */
 577         if (arginfo->handle_opt == NULL) {
 578             (void) fprintf(stderr, "qemu: unknown option '%s'\n", r);
 579             exit(EXIT_FAILURE);
 580         }
 581     }
 582
 583     if (optind >= argc) {
 584         (void) fprintf(stderr, "qemu: no user program specified\n");
 585         exit(EXIT_FAILURE);
 586     }
 587
 588     filename = argv[optind];
 589     exec_path = argv[optind];
 590
 591     return optind;
 592 }
 593
 594 int main(int argc, char **argv, char **envp)
 595 {
 596     struct target_pt_regs regs1, *regs = &regs1;
 597     struct image_info info1, *info = &info1;
 598     struct linux_binprm bprm;
 599     TaskState *ts;
 600     CPUArchState *env;
 601     CPUState *cpu;
 602     int optind;
 603     char **target_environ, **wrk;
 604     char **target_argv;
 605     int target_argc;
 606     int i;
 607     int ret;
 608     int execfd;
 609
 610     error_init(argv[0]);
 611     module_call_init(MODULE_INIT_TRACE);
 612     qemu_init_cpu_list();
 613     module_call_init(MODULE_INIT_QOM);
 614
 615     envlist = envlist_create();
 616
 617     /* add current environment into the list */
 618     for (wrk = environ; *wrk != NULL; wrk++) {
 619         (void) envlist_setenv(envlist, *wrk);
 620     }
 621
 622     /* Read the stack limit from the kernel.  If it's "unlimited",
 623        then we can do little else besides use the default.  */
 624     {
 625         struct rlimit lim;
 626         if (getrlimit(RLIMIT_STACK, &lim) == 0
 627             && lim.rlim_cur != RLIM_INFINITY
 628             && lim.rlim_cur == (target_long)lim.rlim_cur) {
 629             guest_stack_size = lim.rlim_cur;
 630         }
 631     }
 632
 633     cpu_model = NULL;
 634
 635     qemu_add_opts(&qemu_trace_opts);
 636
 637     optind = parse_args(argc, argv);
 638
 639     if (!trace_init_backends()) {
 640         exit(1);
 641     }
 642     trace_init_file(trace_file);
 643
 644     /* Zero out regs */
 645     memset(regs, 0, sizeof(struct target_pt_regs));
 646
 647     /* Zero out image_info */
 648     memset(info, 0, sizeof(struct image_info));
 649
 650     memset(&bprm, 0, sizeof (bprm));
 651
 652     /* Scan interp_prefix dir for replacement files. */
 653     init_paths(interp_prefix);
 654
 655     init_qemu_uname_release();
 656
 657     execfd = qemu_getauxval(AT_EXECFD);
 658     if (execfd == 0) {
 659         execfd = open(filename, O_RDONLY);
 660         if (execfd < 0) {
 661             printf("Error while loading %s: %s\n", filename, strerror(errno));
 662             _exit(EXIT_FAILURE);
 663         }
 664     }
 665
 666     if (cpu_model == NULL) {
 667         cpu_model = cpu_get_model(get_elf_eflags(execfd));
 668     }
 669     cpu_type = parse_cpu_option(cpu_model);
 670
 671     /* init tcg before creating CPUs and to get qemu_host_page_size */
 672     tcg_exec_init(0);
 673
 674     /* Reserving *too* much vm space via mmap can run into problems
 675        with rlimits, oom due to page table creation, etc.  We will still try it,
 676        if directed by the command-line option, but not by default.  */
 677     if (HOST_LONG_BITS == 64 &&
 678         TARGET_VIRT_ADDR_SPACE_BITS <= 32 &&
 679         reserved_va == 0) {
 680         /* reserved_va must be aligned with the host page size
 681          * as it is used with mmap()
 682          */
 683         reserved_va = MAX_RESERVED_VA & qemu_host_page_mask;
 684     }
 685
 686     cpu = cpu_create(cpu_type);
 687     env = cpu->env_ptr;
 688     cpu_reset(cpu);
 689
 690     thread_cpu = cpu;
 691
 692     if (getenv("QEMU_STRACE")) {
 693         do_strace = 1;
 694     }
 695
 696     if (seed_optarg == NULL) {
 697         seed_optarg = getenv("QEMU_RAND_SEED");
 698     }
 699     {
 700         Error *err = NULL;
 701         if (seed_optarg != NULL) {
 702             qemu_guest_random_seed_main(seed_optarg, &err);
 703         } else {
 704             qcrypto_init(&err);
 705         }
 706         if (err) {
 707             error_reportf_err(err, "cannot initialize crypto: ");
 708             exit(1);
 709         }
 710     }
 711
 712     target_environ = envlist_to_environ(envlist, NULL);
 713     envlist_free(envlist);
 714
 715     /*
 716      * Now that page sizes are configured in tcg_exec_init() we can do
 717      * proper page alignment for guest_base.
 718      */
 719     guest_base = HOST_PAGE_ALIGN(guest_base);
 720
 721     if (reserved_va || have_guest_base) {
 722         guest_base = init_guest_space(guest_base, reserved_va, 0,
 723                                       have_guest_base);
 724         if (guest_base == (unsigned long)-1) {
 725             fprintf(stderr, "Unable to reserve 0x%lx bytes of virtual address "
 726                     "space for use as guest address space (check your virtual "
 727                     "memory ulimit setting or reserve less using -R option)\n",
 728                     reserved_va);
 729             exit(EXIT_FAILURE);
 730         }
 731
 732         if (reserved_va) {
 733             mmap_next_start = reserved_va;
 734         }
 735     }
 736
 737     /*
 738      * Read in mmap_min_addr kernel parameter.  This value is used
 739      * When loading the ELF image to determine whether guest_base
 740      * is needed.  It is also used in mmap_find_vma.
 741      */
 742     {
 743         FILE *fp;
 744
 745         if ((fp = fopen("/proc/sys/vm/mmap_min_addr", "r")) != NULL) {
 746             unsigned long tmp;
 747             if (fscanf(fp, "%lu", &tmp) == 1) {
 748                 mmap_min_addr = tmp;
 749                 qemu_log_mask(CPU_LOG_PAGE, "host mmap_min_addr=0x%lx\n", mmap_min_addr);
 750             }
 751             fclose(fp);
 752         }
 753     }
 754
 755     /*
 756      * Prepare copy of argv vector for target.
 757      */
 758     target_argc = argc - optind;
 759     target_argv = calloc(target_argc + 1, sizeof (char *));
 760     if (target_argv == NULL) {
 761         (void) fprintf(stderr, "Unable to allocate memory for target_argv\n");
 762         exit(EXIT_FAILURE);
 763     }
 764
 765     /*
 766      * If argv0 is specified (using '-0' switch) we replace
 767      * argv[0] pointer with the given one.
 768      */
 769     i = 0;
 770     if (argv0 != NULL) {
 771         target_argv[i++] = strdup(argv0);
 772     }
 773     for (; i < target_argc; i++) {
 774         target_argv[i] = strdup(argv[optind + i]);
 775     }
 776     target_argv[target_argc] = NULL;
 777
 778     ts = g_new0(TaskState, 1);
 779     init_task_state(ts);
 780     /* build Task State */
 781     ts->info = info;
 782     ts->bprm = &bprm;
 783     cpu->opaque = ts;
 784     task_settid(ts);
 785
 786     ret = loader_exec(execfd, filename, target_argv, target_environ, regs,
 787         info, &bprm);
 788     if (ret != 0) {
 789         printf("Error while loading %s: %s\n", filename, strerror(-ret));
 790         _exit(EXIT_FAILURE);
 791     }
 792
 793     for (wrk = target_environ; *wrk; wrk++) {
 794         g_free(*wrk);
 795     }
 796
 797     g_free(target_environ);
 798
 799     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 800         qemu_log("guest_base  0x%lx\n", guest_base);
 801         log_page_dump();
 802
 803         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 804         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 805         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n", info->start_code);
 806         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n", info->start_data);
 807         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 808         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n", info->start_stack);
 809         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 810         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 811         qemu_log("argv_start  0x" TARGET_ABI_FMT_lx "\n", info->arg_start);
 812         qemu_log("env_start   0x" TARGET_ABI_FMT_lx "\n",
 813                  info->arg_end + (abi_ulong)sizeof(abi_ulong));
 814         qemu_log("auxv_start  0x" TARGET_ABI_FMT_lx "\n", info->saved_auxv);
 815     }
 816
 817     target_set_brk(info->brk);
 818     syscall_init();
 819     signal_init();
 820
 821     /* Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 822        generating the prologue until now so that the prologue can take
 823        the real value of GUEST_BASE into account.  */
 824     tcg_prologue_init(tcg_ctx);
 825     tcg_region_init();
 826
 827     target_cpu_copy_regs(env, regs);
 828
 829     if (gdbstub_port) {
 830         if (gdbserver_start(gdbstub_port) < 0) {
 831             fprintf(stderr, "qemu: could not open gdbserver on port %d\n",
 832                     gdbstub_port);
 833             exit(EXIT_FAILURE);
 834         }
 835         gdb_handlesig(cpu, 0);
 836     }
 837     cpu_loop(env);
 838     /* never exits */
 839     return 0;
 840 }