bsd-user/main.c

   1 /*
   2  *  qemu bsd user main
   3  *
   4  *  Copyright (c) 2003-2008 Fabrice Bellard
   5  *  Copyright (c) 2013-14 Stacey Son
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <sys/types.h>
  22 #include <sys/time.h>
  23 #include <sys/resource.h>
  24 #include <sys/sysctl.h>
  25
  26 #include "qemu/osdep.h"
  27 #include "qemu-common.h"
  28 #include "qemu/units.h"
  29 #include "qemu/accel.h"
  30 #include "sysemu/tcg.h"
  31 #include "qemu-version.h"
  32 #include <machine/trap.h>
  33
  34 #include "qapi/error.h"
  35 #include "qemu.h"
  36 #include "qemu/config-file.h"
  37 #include "qemu/error-report.h"
  38 #include "qemu/path.h"
  39 #include "qemu/help_option.h"
  40 #include "qemu/module.h"
  41 #include "exec/exec-all.h"
  42 #include "tcg/tcg.h"
  43 #include "qemu/timer.h"
  44 #include "qemu/envlist.h"
  45 #include "qemu/cutils.h"
  46 #include "exec/log.h"
  47 #include "trace/control.h"
  48 #include "crypto/init.h"
  49 #include "qemu/guest-random.h"
  50
  51 #include "host-os.h"
  52 #include "target_arch_cpu.h"
  53
  54 int singlestep;
  55 unsigned long mmap_min_addr;
  56 uintptr_t guest_base;
  57 bool have_guest_base;
  58 unsigned long reserved_va;
  59
  60 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
  61 const char *qemu_uname_release;
  62 enum BSDType bsd_type;
  63 char qemu_proc_pathname[PATH_MAX];  /* full path to exeutable */
  64
  65 unsigned long target_maxtsiz = TARGET_MAXTSIZ;   /* max text size */
  66 unsigned long target_dfldsiz = TARGET_DFLDSIZ;   /* initial data size limit */
  67 unsigned long target_maxdsiz = TARGET_MAXDSIZ;   /* max data size */
  68 unsigned long target_dflssiz = TARGET_DFLSSIZ;   /* initial data size limit */
  69 unsigned long target_maxssiz = TARGET_MAXSSIZ;   /* max stack size */
  70 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
  71
  72 /* Helper routines for implementing atomic operations. */
  73
  74 void fork_start(void)
  75 {
  76     start_exclusive();
  77     cpu_list_lock();
  78     mmap_fork_start();
  79 }
  80
  81 void fork_end(int child)
  82 {
  83     if (child) {
  84         CPUState *cpu, *next_cpu;
  85         /*
  86          * Child processes created by fork() only have a single thread.  Discard
  87          * information about the parent threads.
  88          */
  89         CPU_FOREACH_SAFE(cpu, next_cpu) {
  90             if (cpu != thread_cpu) {
  91                 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
  92             }
  93         }
  94         mmap_fork_end(child);
  95         /*
  96          * qemu_init_cpu_list() takes care of reinitializing the exclusive
  97          * state, so we don't need to end_exclusive() here.
  98          */
  99         qemu_init_cpu_list();
 100         gdbserver_fork(thread_cpu);
 101     } else {
 102         mmap_fork_end(child);
 103         cpu_list_unlock();
 104         end_exclusive();
 105     }
 106 }
 107
 108 void cpu_loop(CPUArchState *env)
 109 {
 110     target_cpu_loop(env);
 111 }
 112
 113 static void usage(void)
 114 {
 115     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
 116            "\n" QEMU_COPYRIGHT "\n"
 117            "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
 118            "BSD CPU emulator (compiled for %s emulation)\n"
 119            "\n"
 120            "Standard options:\n"
 121            "-h                print this help\n"
 122            "-g port           wait gdb connection to port\n"
 123            "-L path           set the elf interpreter prefix (default=%s)\n"
 124            "-s size           set the stack size in bytes (default=%ld)\n"
 125            "-cpu model        select CPU (-cpu help for list)\n"
 126            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
 127            "-E var=value      sets/modifies targets environment variable(s)\n"
 128            "-U var            unsets targets environment variable(s)\n"
 129            "-B address        set guest_base address to address\n"
 130            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
 131            "\n"
 132            "Debug options:\n"
 133            "-d item1[,...]    enable logging of specified items\n"
 134            "                  (use '-d help' for a list of log items)\n"
 135            "-D logfile        write logs to 'logfile' (default stderr)\n"
 136            "-singlestep       always run in singlestep mode\n"
 137            "-strace           log system calls\n"
 138            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
 139            "                  specify tracing options\n"
 140            "\n"
 141            "Environment variables:\n"
 142            "QEMU_STRACE       Print system calls and arguments similar to the\n"
 143            "                  'strace' program.  Enable by setting to any value.\n"
 144            "You can use -E and -U options to set/unset environment variables\n"
 145            "for target process.  It is possible to provide several variables\n"
 146            "by repeating the option.  For example:\n"
 147            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 148            "Note that if you provide several changes to single variable\n"
 149            "last change will stay in effect.\n"
 150            "\n"
 151            QEMU_HELP_BOTTOM "\n"
 152            ,
 153            TARGET_NAME,
 154            interp_prefix,
 155            target_dflssiz);
 156     exit(1);
 157 }
 158
 159 __thread CPUState *thread_cpu;
 160
 161 bool qemu_cpu_is_self(CPUState *cpu)
 162 {
 163     return thread_cpu == cpu;
 164 }
 165
 166 void qemu_cpu_kick(CPUState *cpu)
 167 {
 168     cpu_exit(cpu);
 169 }
 170
 171 /* Assumes contents are already zeroed.  */
 172 void init_task_state(TaskState *ts)
 173 {
 174     int i;
 175
 176     ts->used = 1;
 177     ts->first_free = ts->sigqueue_table;
 178     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
 179         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
 180     }
 181     ts->sigqueue_table[i].next = NULL;
 182 }
 183
 184 void gemu_log(const char *fmt, ...)
 185 {
 186     va_list ap;
 187
 188     va_start(ap, fmt);
 189     vfprintf(stderr, fmt, ap);
 190     va_end(ap);
 191 }
 192
 193 static void
 194 adjust_ssize(void)
 195 {
 196     struct rlimit rl;
 197
 198     if (getrlimit(RLIMIT_STACK, &rl) != 0) {
 199         return;
 200     }
 201
 202     target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
 203     target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
 204
 205     rl.rlim_max = target_maxssiz;
 206     rl.rlim_cur = target_dflssiz;
 207     setrlimit(RLIMIT_STACK, &rl);
 208 }
 209
 210 static void save_proc_pathname(char *argv0)
 211 {
 212     int mib[4];
 213     size_t len;
 214
 215     mib[0] = CTL_KERN;
 216     mib[1] = KERN_PROC;
 217     mib[2] = KERN_PROC_PATHNAME;
 218     mib[3] = -1;
 219
 220     len = sizeof(qemu_proc_pathname);
 221     if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
 222         perror("sysctl");
 223     }
 224 }
 225
 226 int main(int argc, char **argv)
 227 {
 228     const char *filename;
 229     const char *cpu_model;
 230     const char *cpu_type;
 231     const char *log_file = NULL;
 232     const char *log_mask = NULL;
 233     const char *seed_optarg = NULL;
 234     struct target_pt_regs regs1, *regs = &regs1;
 235     struct image_info info1, *info = &info1;
 236     struct bsd_binprm bprm;
 237     TaskState *ts;
 238     CPUArchState *env;
 239     CPUState *cpu;
 240     int optind, rv;
 241     const char *r;
 242     const char *gdbstub = NULL;
 243     char **target_environ, **wrk;
 244     envlist_t *envlist = NULL;
 245     bsd_type = HOST_DEFAULT_BSD_TYPE;
 246     char *argv0 = NULL;
 247
 248     adjust_ssize();
 249
 250     if (argc <= 1) {
 251         usage();
 252     }
 253
 254     save_proc_pathname(argv[0]);
 255
 256     error_init(argv[0]);
 257     module_call_init(MODULE_INIT_TRACE);
 258     qemu_init_cpu_list();
 259     module_call_init(MODULE_INIT_QOM);
 260
 261     envlist = envlist_create();
 262
 263     /* add current environment into the list */
 264     for (wrk = environ; *wrk != NULL; wrk++) {
 265         (void) envlist_setenv(envlist, *wrk);
 266     }
 267
 268     cpu_model = NULL;
 269
 270     qemu_add_opts(&qemu_trace_opts);
 271
 272     optind = 1;
 273     for (;;) {
 274         if (optind >= argc) {
 275             break;
 276         }
 277         r = argv[optind];
 278         if (r[0] != '-') {
 279             break;
 280         }
 281         optind++;
 282         r++;
 283         if (!strcmp(r, "-")) {
 284             break;
 285         } else if (!strcmp(r, "d")) {
 286             if (optind >= argc) {
 287                 break;
 288             }
 289             log_mask = argv[optind++];
 290         } else if (!strcmp(r, "D")) {
 291             if (optind >= argc) {
 292                 break;
 293             }
 294             log_file = argv[optind++];
 295         } else if (!strcmp(r, "E")) {
 296             r = argv[optind++];
 297             if (envlist_setenv(envlist, r) != 0) {
 298                 usage();
 299             }
 300         } else if (!strcmp(r, "ignore-environment")) {
 301             envlist_free(envlist);
 302             envlist = envlist_create();
 303         } else if (!strcmp(r, "U")) {
 304             r = argv[optind++];
 305             if (envlist_unsetenv(envlist, r) != 0) {
 306                 usage();
 307             }
 308         } else if (!strcmp(r, "s")) {
 309             r = argv[optind++];
 310             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
 311             if (rv < 0 || target_dflssiz <= 0) {
 312                 usage();
 313             }
 314             if (*r == 'M') {
 315                 target_dflssiz *= 1024 * 1024;
 316             } else if (*r == 'k' || *r == 'K') {
 317                 target_dflssiz *= 1024;
 318             }
 319             if (target_dflssiz > target_maxssiz) {
 320                 usage();
 321             }
 322         } else if (!strcmp(r, "L")) {
 323             interp_prefix = argv[optind++];
 324         } else if (!strcmp(r, "p")) {
 325             qemu_host_page_size = atoi(argv[optind++]);
 326             if (qemu_host_page_size == 0 ||
 327                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 328                 fprintf(stderr, "page size must be a power of two\n");
 329                 exit(1);
 330             }
 331         } else if (!strcmp(r, "g")) {
 332             gdbstub = g_strdup(argv[optind++]);
 333         } else if (!strcmp(r, "r")) {
 334             qemu_uname_release = argv[optind++];
 335         } else if (!strcmp(r, "cpu")) {
 336             cpu_model = argv[optind++];
 337             if (is_help_option(cpu_model)) {
 338                 /* XXX: implement xxx_cpu_list for targets that still miss it */
 339 #if defined(cpu_list)
 340                 cpu_list();
 341 #endif
 342                 exit(1);
 343             }
 344         } else if (!strcmp(r, "B")) {
 345             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
 346             if (rv < 0) {
 347                 usage();
 348             }
 349             have_guest_base = true;
 350         } else if (!strcmp(r, "drop-ld-preload")) {
 351             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
 352         } else if (!strcmp(r, "bsd")) {
 353             if (!strcasecmp(argv[optind], "freebsd")) {
 354                 bsd_type = target_freebsd;
 355             } else if (!strcasecmp(argv[optind], "netbsd")) {
 356                 bsd_type = target_netbsd;
 357             } else if (!strcasecmp(argv[optind], "openbsd")) {
 358                 bsd_type = target_openbsd;
 359             } else {
 360                 usage();
 361             }
 362             optind++;
 363         } else if (!strcmp(r, "seed")) {
 364             seed_optarg = optarg;
 365         } else if (!strcmp(r, "singlestep")) {
 366             singlestep = 1;
 367         } else if (!strcmp(r, "strace")) {
 368             do_strace = 1;
 369         } else if (!strcmp(r, "trace")) {
 370             trace_opt_parse(optarg);
 371         } else if (!strcmp(r, "0")) {
 372             argv0 = argv[optind++];
 373         } else {
 374             usage();
 375         }
 376     }
 377
 378     /* init debug */
 379     qemu_log_needs_buffers();
 380     qemu_set_log_filename(log_file, &error_fatal);
 381     if (log_mask) {
 382         int mask;
 383
 384         mask = qemu_str_to_log_mask(log_mask);
 385         if (!mask) {
 386             qemu_print_log_usage(stdout);
 387             exit(1);
 388         }
 389         qemu_set_log(mask);
 390     }
 391
 392     if (optind >= argc) {
 393         usage();
 394     }
 395     filename = argv[optind];
 396     if (argv0) {
 397         argv[optind] = argv0;
 398     }
 399
 400     if (!trace_init_backends()) {
 401         exit(1);
 402     }
 403     trace_init_file();
 404
 405     /* Zero out regs */
 406     memset(regs, 0, sizeof(struct target_pt_regs));
 407
 408     /* Zero bsd params */
 409     memset(&bprm, 0, sizeof(bprm));
 410
 411     /* Zero out image_info */
 412     memset(info, 0, sizeof(struct image_info));
 413
 414     /* Scan interp_prefix dir for replacement files. */
 415     init_paths(interp_prefix);
 416
 417     if (cpu_model == NULL) {
 418         cpu_model = TARGET_DEFAULT_CPU_MODEL;
 419     }
 420
 421     cpu_type = parse_cpu_option(cpu_model);
 422
 423     /* init tcg before creating CPUs and to get qemu_host_page_size */
 424     {
 425         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 426
 427         accel_init_interfaces(ac);
 428         ac->init_machine(NULL);
 429     }
 430     cpu = cpu_create(cpu_type);
 431     env = cpu->env_ptr;
 432     cpu_reset(cpu);
 433     thread_cpu = cpu;
 434
 435     if (getenv("QEMU_STRACE")) {
 436         do_strace = 1;
 437     }
 438
 439     target_environ = envlist_to_environ(envlist, NULL);
 440     envlist_free(envlist);
 441
 442     {
 443         Error *err = NULL;
 444         if (seed_optarg != NULL) {
 445             qemu_guest_random_seed_main(seed_optarg, &err);
 446         } else {
 447             qcrypto_init(&err);
 448         }
 449         if (err) {
 450             error_reportf_err(err, "cannot initialize crypto: ");
 451             exit(1);
 452         }
 453     }
 454
 455     /*
 456      * Now that page sizes are configured we can do
 457      * proper page alignment for guest_base.
 458      */
 459     guest_base = HOST_PAGE_ALIGN(guest_base);
 460
 461     if (loader_exec(filename, argv + optind, target_environ, regs, info,
 462                     &bprm) != 0) {
 463         printf("Error loading %s\n", filename);
 464         _exit(1);
 465     }
 466
 467     for (wrk = target_environ; *wrk; wrk++) {
 468         g_free(*wrk);
 469     }
 470
 471     g_free(target_environ);
 472
 473     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 474         qemu_log("guest_base  %p\n", (void *)guest_base);
 475         log_page_dump("binary load");
 476
 477         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 478         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 479         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
 480                  info->start_code);
 481         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
 482                  info->start_data);
 483         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 484         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
 485                  info->start_stack);
 486         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 487         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 488     }
 489
 490     /* build Task State */
 491     ts = g_new0(TaskState, 1);
 492     init_task_state(ts);
 493     ts->info = info;
 494     ts->bprm = &bprm;
 495     cpu->opaque = ts;
 496
 497     target_set_brk(info->brk);
 498     syscall_init();
 499     signal_init();
 500
 501     /*
 502      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 503      * generating the prologue until now so that the prologue can take
 504      * the real value of GUEST_BASE into account.
 505      */
 506     tcg_prologue_init(tcg_ctx);
 507
 508     target_cpu_init(env, regs);
 509
 510     if (gdbstub) {
 511         gdbserver_start(gdbstub);
 512         gdb_handlesig(cpu, 0);
 513     }
 514     cpu_loop(env);
 515     /* never exits */
 516     return 0;
 517 }