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 void gemu_log(const char *fmt, ...)
  73 {
  74     va_list ap;
  75
  76     va_start(ap, fmt);
  77     vfprintf(stderr, fmt, ap);
  78     va_end(ap);
  79 }
  80
  81 void fork_start(void)
  82 {
  83 }
  84
  85 void fork_end(int child)
  86 {
  87     if (child) {
  88         gdbserver_fork(thread_cpu);
  89     }
  90 }
  91
  92 void cpu_loop(CPUArchState *env)
  93 {
  94     target_cpu_loop(env);
  95 }
  96
  97 static void usage(void)
  98 {
  99     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
 100            "\n" QEMU_COPYRIGHT "\n"
 101            "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
 102            "BSD CPU emulator (compiled for %s emulation)\n"
 103            "\n"
 104            "Standard options:\n"
 105            "-h                print this help\n"
 106            "-g port           wait gdb connection to port\n"
 107            "-L path           set the elf interpreter prefix (default=%s)\n"
 108            "-s size           set the stack size in bytes (default=%ld)\n"
 109            "-cpu model        select CPU (-cpu help for list)\n"
 110            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
 111            "-E var=value      sets/modifies targets environment variable(s)\n"
 112            "-U var            unsets targets environment variable(s)\n"
 113            "-B address        set guest_base address to address\n"
 114            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
 115            "\n"
 116            "Debug options:\n"
 117            "-d item1[,...]    enable logging of specified items\n"
 118            "                  (use '-d help' for a list of log items)\n"
 119            "-D logfile        write logs to 'logfile' (default stderr)\n"
 120            "-singlestep       always run in singlestep mode\n"
 121            "-strace           log system calls\n"
 122            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
 123            "                  specify tracing options\n"
 124            "\n"
 125            "Environment variables:\n"
 126            "QEMU_STRACE       Print system calls and arguments similar to the\n"
 127            "                  'strace' program.  Enable by setting to any value.\n"
 128            "You can use -E and -U options to set/unset environment variables\n"
 129            "for target process.  It is possible to provide several variables\n"
 130            "by repeating the option.  For example:\n"
 131            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 132            "Note that if you provide several changes to single variable\n"
 133            "last change will stay in effect.\n"
 134            "\n"
 135            QEMU_HELP_BOTTOM "\n"
 136            ,
 137            TARGET_NAME,
 138            interp_prefix,
 139            target_dflssiz);
 140     exit(1);
 141 }
 142
 143 __thread CPUState *thread_cpu;
 144
 145 bool qemu_cpu_is_self(CPUState *cpu)
 146 {
 147     return thread_cpu == cpu;
 148 }
 149
 150 void qemu_cpu_kick(CPUState *cpu)
 151 {
 152     cpu_exit(cpu);
 153 }
 154
 155 /* Assumes contents are already zeroed.  */
 156 void init_task_state(TaskState *ts)
 157 {
 158     int i;
 159
 160     ts->used = 1;
 161     ts->first_free = ts->sigqueue_table;
 162     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
 163         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
 164     }
 165     ts->sigqueue_table[i].next = NULL;
 166 }
 167
 168 static void
 169 adjust_ssize(void)
 170 {
 171     struct rlimit rl;
 172
 173     if (getrlimit(RLIMIT_STACK, &rl) != 0) {
 174         return;
 175     }
 176
 177     target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
 178     target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
 179
 180     rl.rlim_max = target_maxssiz;
 181     rl.rlim_cur = target_dflssiz;
 182     setrlimit(RLIMIT_STACK, &rl);
 183 }
 184
 185 static void save_proc_pathname(char *argv0)
 186 {
 187     int mib[4];
 188     size_t len;
 189
 190     mib[0] = CTL_KERN;
 191     mib[1] = KERN_PROC;
 192     mib[2] = KERN_PROC_PATHNAME;
 193     mib[3] = -1;
 194
 195     len = sizeof(qemu_proc_pathname);
 196     if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
 197         perror("sysctl");
 198     }
 199 }
 200
 201 int main(int argc, char **argv)
 202 {
 203     const char *filename;
 204     const char *cpu_model;
 205     const char *cpu_type;
 206     const char *log_file = NULL;
 207     const char *log_mask = NULL;
 208     const char *seed_optarg = NULL;
 209     struct target_pt_regs regs1, *regs = &regs1;
 210     struct image_info info1, *info = &info1;
 211     struct bsd_binprm bprm;
 212     TaskState *ts;
 213     CPUArchState *env;
 214     CPUState *cpu;
 215     int optind, rv;
 216     const char *r;
 217     const char *gdbstub = NULL;
 218     char **target_environ, **wrk;
 219     envlist_t *envlist = NULL;
 220     bsd_type = HOST_DEFAULT_BSD_TYPE;
 221
 222     adjust_ssize();
 223
 224     if (argc <= 1) {
 225         usage();
 226     }
 227
 228     save_proc_pathname(argv[0]);
 229
 230     error_init(argv[0]);
 231     module_call_init(MODULE_INIT_TRACE);
 232     qemu_init_cpu_list();
 233     module_call_init(MODULE_INIT_QOM);
 234
 235     envlist = envlist_create();
 236
 237     /* add current environment into the list */
 238     for (wrk = environ; *wrk != NULL; wrk++) {
 239         (void) envlist_setenv(envlist, *wrk);
 240     }
 241
 242     cpu_model = NULL;
 243
 244     qemu_add_opts(&qemu_trace_opts);
 245
 246     optind = 1;
 247     for (;;) {
 248         if (optind >= argc) {
 249             break;
 250         }
 251         r = argv[optind];
 252         if (r[0] != '-') {
 253             break;
 254         }
 255         optind++;
 256         r++;
 257         if (!strcmp(r, "-")) {
 258             break;
 259         } else if (!strcmp(r, "d")) {
 260             if (optind >= argc) {
 261                 break;
 262             }
 263             log_mask = argv[optind++];
 264         } else if (!strcmp(r, "D")) {
 265             if (optind >= argc) {
 266                 break;
 267             }
 268             log_file = argv[optind++];
 269         } else if (!strcmp(r, "E")) {
 270             r = argv[optind++];
 271             if (envlist_setenv(envlist, r) != 0) {
 272                 usage();
 273             }
 274         } else if (!strcmp(r, "ignore-environment")) {
 275             envlist_free(envlist);
 276             envlist = envlist_create();
 277         } else if (!strcmp(r, "U")) {
 278             r = argv[optind++];
 279             if (envlist_unsetenv(envlist, r) != 0) {
 280                 usage();
 281             }
 282         } else if (!strcmp(r, "s")) {
 283             r = argv[optind++];
 284             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
 285             if (rv < 0 || target_dflssiz <= 0) {
 286                 usage();
 287             }
 288             if (*r == 'M') {
 289                 target_dflssiz *= 1024 * 1024;
 290             } else if (*r == 'k' || *r == 'K') {
 291                 target_dflssiz *= 1024;
 292             }
 293             if (target_dflssiz > target_maxssiz) {
 294                 usage();
 295             }
 296         } else if (!strcmp(r, "L")) {
 297             interp_prefix = argv[optind++];
 298         } else if (!strcmp(r, "p")) {
 299             qemu_host_page_size = atoi(argv[optind++]);
 300             if (qemu_host_page_size == 0 ||
 301                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 302                 fprintf(stderr, "page size must be a power of two\n");
 303                 exit(1);
 304             }
 305         } else if (!strcmp(r, "g")) {
 306             gdbstub = g_strdup(argv[optind++]);
 307         } else if (!strcmp(r, "r")) {
 308             qemu_uname_release = argv[optind++];
 309         } else if (!strcmp(r, "cpu")) {
 310             cpu_model = argv[optind++];
 311             if (is_help_option(cpu_model)) {
 312                 /* XXX: implement xxx_cpu_list for targets that still miss it */
 313 #if defined(cpu_list)
 314                 cpu_list();
 315 #endif
 316                 exit(1);
 317             }
 318         } else if (!strcmp(r, "B")) {
 319             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
 320             if (rv < 0) {
 321                 usage();
 322             }
 323             have_guest_base = true;
 324         } else if (!strcmp(r, "drop-ld-preload")) {
 325             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
 326         } else if (!strcmp(r, "bsd")) {
 327             if (!strcasecmp(argv[optind], "freebsd")) {
 328                 bsd_type = target_freebsd;
 329             } else if (!strcasecmp(argv[optind], "netbsd")) {
 330                 bsd_type = target_netbsd;
 331             } else if (!strcasecmp(argv[optind], "openbsd")) {
 332                 bsd_type = target_openbsd;
 333             } else {
 334                 usage();
 335             }
 336             optind++;
 337         } else if (!strcmp(r, "seed")) {
 338             seed_optarg = optarg;
 339         } else if (!strcmp(r, "singlestep")) {
 340             singlestep = 1;
 341         } else if (!strcmp(r, "strace")) {
 342             do_strace = 1;
 343         } else if (!strcmp(r, "trace")) {
 344             trace_opt_parse(optarg);
 345         } else {
 346             usage();
 347         }
 348     }
 349
 350     /* init debug */
 351     qemu_log_needs_buffers();
 352     qemu_set_log_filename(log_file, &error_fatal);
 353     if (log_mask) {
 354         int mask;
 355
 356         mask = qemu_str_to_log_mask(log_mask);
 357         if (!mask) {
 358             qemu_print_log_usage(stdout);
 359             exit(1);
 360         }
 361         qemu_set_log(mask);
 362     }
 363
 364     if (optind >= argc) {
 365         usage();
 366     }
 367     filename = argv[optind];
 368
 369     if (!trace_init_backends()) {
 370         exit(1);
 371     }
 372     trace_init_file();
 373
 374     /* Zero out regs */
 375     memset(regs, 0, sizeof(struct target_pt_regs));
 376
 377     /* Zero bsd params */
 378     memset(&bprm, 0, sizeof(bprm));
 379
 380     /* Zero out image_info */
 381     memset(info, 0, sizeof(struct image_info));
 382
 383     /* Scan interp_prefix dir for replacement files. */
 384     init_paths(interp_prefix);
 385
 386     if (cpu_model == NULL) {
 387         cpu_model = TARGET_DEFAULT_CPU_MODEL;
 388     }
 389
 390     cpu_type = parse_cpu_option(cpu_model);
 391
 392     /* init tcg before creating CPUs and to get qemu_host_page_size */
 393     {
 394         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 395
 396         accel_init_interfaces(ac);
 397         ac->init_machine(NULL);
 398     }
 399     cpu = cpu_create(cpu_type);
 400     env = cpu->env_ptr;
 401     cpu_reset(cpu);
 402     thread_cpu = cpu;
 403
 404     if (getenv("QEMU_STRACE")) {
 405         do_strace = 1;
 406     }
 407
 408     target_environ = envlist_to_environ(envlist, NULL);
 409     envlist_free(envlist);
 410
 411     {
 412         Error *err = NULL;
 413         if (seed_optarg != NULL) {
 414             qemu_guest_random_seed_main(seed_optarg, &err);
 415         } else {
 416             qcrypto_init(&err);
 417         }
 418         if (err) {
 419             error_reportf_err(err, "cannot initialize crypto: ");
 420             exit(1);
 421         }
 422     }
 423
 424     /*
 425      * Now that page sizes are configured we can do
 426      * proper page alignment for guest_base.
 427      */
 428     guest_base = HOST_PAGE_ALIGN(guest_base);
 429
 430     if (loader_exec(filename, argv + optind, target_environ, regs, info,
 431                     &bprm) != 0) {
 432         printf("Error loading %s\n", filename);
 433         _exit(1);
 434     }
 435
 436     for (wrk = target_environ; *wrk; wrk++) {
 437         g_free(*wrk);
 438     }
 439
 440     g_free(target_environ);
 441
 442     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 443         qemu_log("guest_base  %p\n", (void *)guest_base);
 444         log_page_dump("binary load");
 445
 446         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 447         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 448         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
 449                  info->start_code);
 450         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
 451                  info->start_data);
 452         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 453         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
 454                  info->start_stack);
 455         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 456         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 457     }
 458
 459     /* build Task State */
 460     ts = g_new0(TaskState, 1);
 461     init_task_state(ts);
 462     ts->info = info;
 463     ts->bprm = &bprm;
 464     cpu->opaque = ts;
 465
 466     target_set_brk(info->brk);
 467     syscall_init();
 468     signal_init();
 469
 470     /*
 471      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 472      * generating the prologue until now so that the prologue can take
 473      * the real value of GUEST_BASE into account.
 474      */
 475     tcg_prologue_init(tcg_ctx);
 476
 477     target_cpu_init(env, regs);
 478
 479     if (gdbstub) {
 480         gdbserver_start(gdbstub);
 481         gdb_handlesig(cpu, 0);
 482     }
 483     cpu_loop(env);
 484     /* never exits */
 485     return 0;
 486 }