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
  73 void fork_start(void)
  74 {
  75 }
  76
  77 void fork_end(int child)
  78 {
  79     if (child) {
  80         gdbserver_fork(thread_cpu);
  81     }
  82 }
  83
  84 void cpu_loop(CPUArchState *env)
  85 {
  86     target_cpu_loop(env);
  87 }
  88
  89 static void usage(void)
  90 {
  91     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
  92            "\n" QEMU_COPYRIGHT "\n"
  93            "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
  94            "BSD CPU emulator (compiled for %s emulation)\n"
  95            "\n"
  96            "Standard options:\n"
  97            "-h                print this help\n"
  98            "-g port           wait gdb connection to port\n"
  99            "-L path           set the elf interpreter prefix (default=%s)\n"
 100            "-s size           set the stack size in bytes (default=%ld)\n"
 101            "-cpu model        select CPU (-cpu help for list)\n"
 102            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
 103            "-E var=value      sets/modifies targets environment variable(s)\n"
 104            "-U var            unsets targets environment variable(s)\n"
 105            "-B address        set guest_base address to address\n"
 106            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
 107            "\n"
 108            "Debug options:\n"
 109            "-d item1[,...]    enable logging of specified items\n"
 110            "                  (use '-d help' for a list of log items)\n"
 111            "-D logfile        write logs to 'logfile' (default stderr)\n"
 112            "-singlestep       always run in singlestep mode\n"
 113            "-strace           log system calls\n"
 114            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
 115            "                  specify tracing options\n"
 116            "\n"
 117            "Environment variables:\n"
 118            "QEMU_STRACE       Print system calls and arguments similar to the\n"
 119            "                  'strace' program.  Enable by setting to any value.\n"
 120            "You can use -E and -U options to set/unset environment variables\n"
 121            "for target process.  It is possible to provide several variables\n"
 122            "by repeating the option.  For example:\n"
 123            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 124            "Note that if you provide several changes to single variable\n"
 125            "last change will stay in effect.\n"
 126            "\n"
 127            QEMU_HELP_BOTTOM "\n"
 128            ,
 129            TARGET_NAME,
 130            interp_prefix,
 131            target_dflssiz);
 132     exit(1);
 133 }
 134
 135 __thread CPUState *thread_cpu;
 136
 137 bool qemu_cpu_is_self(CPUState *cpu)
 138 {
 139     return thread_cpu == cpu;
 140 }
 141
 142 void qemu_cpu_kick(CPUState *cpu)
 143 {
 144     cpu_exit(cpu);
 145 }
 146
 147 /* Assumes contents are already zeroed.  */
 148 void init_task_state(TaskState *ts)
 149 {
 150     int i;
 151
 152     ts->used = 1;
 153     ts->first_free = ts->sigqueue_table;
 154     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
 155         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
 156     }
 157     ts->sigqueue_table[i].next = NULL;
 158 }
 159
 160 void gemu_log(const char *fmt, ...)
 161 {
 162     va_list ap;
 163
 164     va_start(ap, fmt);
 165     vfprintf(stderr, fmt, ap);
 166     va_end(ap);
 167 }
 168
 169 static void
 170 adjust_ssize(void)
 171 {
 172     struct rlimit rl;
 173
 174     if (getrlimit(RLIMIT_STACK, &rl) != 0) {
 175         return;
 176     }
 177
 178     target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
 179     target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
 180
 181     rl.rlim_max = target_maxssiz;
 182     rl.rlim_cur = target_dflssiz;
 183     setrlimit(RLIMIT_STACK, &rl);
 184 }
 185
 186 static void save_proc_pathname(char *argv0)
 187 {
 188     int mib[4];
 189     size_t len;
 190
 191     mib[0] = CTL_KERN;
 192     mib[1] = KERN_PROC;
 193     mib[2] = KERN_PROC_PATHNAME;
 194     mib[3] = -1;
 195
 196     len = sizeof(qemu_proc_pathname);
 197     if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
 198         perror("sysctl");
 199     }
 200 }
 201
 202 int main(int argc, char **argv)
 203 {
 204     const char *filename;
 205     const char *cpu_model;
 206     const char *cpu_type;
 207     const char *log_file = NULL;
 208     const char *log_mask = NULL;
 209     const char *seed_optarg = NULL;
 210     struct target_pt_regs regs1, *regs = &regs1;
 211     struct image_info info1, *info = &info1;
 212     struct bsd_binprm bprm;
 213     TaskState *ts;
 214     CPUArchState *env;
 215     CPUState *cpu;
 216     int optind, rv;
 217     const char *r;
 218     const char *gdbstub = NULL;
 219     char **target_environ, **wrk;
 220     envlist_t *envlist = NULL;
 221     bsd_type = HOST_DEFAULT_BSD_TYPE;
 222
 223     adjust_ssize();
 224
 225     if (argc <= 1) {
 226         usage();
 227     }
 228
 229     save_proc_pathname(argv[0]);
 230
 231     error_init(argv[0]);
 232     module_call_init(MODULE_INIT_TRACE);
 233     qemu_init_cpu_list();
 234     module_call_init(MODULE_INIT_QOM);
 235
 236     envlist = envlist_create();
 237
 238     /* add current environment into the list */
 239     for (wrk = environ; *wrk != NULL; wrk++) {
 240         (void) envlist_setenv(envlist, *wrk);
 241     }
 242
 243     cpu_model = NULL;
 244
 245     qemu_add_opts(&qemu_trace_opts);
 246
 247     optind = 1;
 248     for (;;) {
 249         if (optind >= argc) {
 250             break;
 251         }
 252         r = argv[optind];
 253         if (r[0] != '-') {
 254             break;
 255         }
 256         optind++;
 257         r++;
 258         if (!strcmp(r, "-")) {
 259             break;
 260         } else if (!strcmp(r, "d")) {
 261             if (optind >= argc) {
 262                 break;
 263             }
 264             log_mask = argv[optind++];
 265         } else if (!strcmp(r, "D")) {
 266             if (optind >= argc) {
 267                 break;
 268             }
 269             log_file = argv[optind++];
 270         } else if (!strcmp(r, "E")) {
 271             r = argv[optind++];
 272             if (envlist_setenv(envlist, r) != 0) {
 273                 usage();
 274             }
 275         } else if (!strcmp(r, "ignore-environment")) {
 276             envlist_free(envlist);
 277             envlist = envlist_create();
 278         } else if (!strcmp(r, "U")) {
 279             r = argv[optind++];
 280             if (envlist_unsetenv(envlist, r) != 0) {
 281                 usage();
 282             }
 283         } else if (!strcmp(r, "s")) {
 284             r = argv[optind++];
 285             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
 286             if (rv < 0 || target_dflssiz <= 0) {
 287                 usage();
 288             }
 289             if (*r == 'M') {
 290                 target_dflssiz *= 1024 * 1024;
 291             } else if (*r == 'k' || *r == 'K') {
 292                 target_dflssiz *= 1024;
 293             }
 294             if (target_dflssiz > target_maxssiz) {
 295                 usage();
 296             }
 297         } else if (!strcmp(r, "L")) {
 298             interp_prefix = argv[optind++];
 299         } else if (!strcmp(r, "p")) {
 300             qemu_host_page_size = atoi(argv[optind++]);
 301             if (qemu_host_page_size == 0 ||
 302                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 303                 fprintf(stderr, "page size must be a power of two\n");
 304                 exit(1);
 305             }
 306         } else if (!strcmp(r, "g")) {
 307             gdbstub = g_strdup(argv[optind++]);
 308         } else if (!strcmp(r, "r")) {
 309             qemu_uname_release = argv[optind++];
 310         } else if (!strcmp(r, "cpu")) {
 311             cpu_model = argv[optind++];
 312             if (is_help_option(cpu_model)) {
 313                 /* XXX: implement xxx_cpu_list for targets that still miss it */
 314 #if defined(cpu_list)
 315                 cpu_list();
 316 #endif
 317                 exit(1);
 318             }
 319         } else if (!strcmp(r, "B")) {
 320             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
 321             if (rv < 0) {
 322                 usage();
 323             }
 324             have_guest_base = true;
 325         } else if (!strcmp(r, "drop-ld-preload")) {
 326             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
 327         } else if (!strcmp(r, "bsd")) {
 328             if (!strcasecmp(argv[optind], "freebsd")) {
 329                 bsd_type = target_freebsd;
 330             } else if (!strcasecmp(argv[optind], "netbsd")) {
 331                 bsd_type = target_netbsd;
 332             } else if (!strcasecmp(argv[optind], "openbsd")) {
 333                 bsd_type = target_openbsd;
 334             } else {
 335                 usage();
 336             }
 337             optind++;
 338         } else if (!strcmp(r, "seed")) {
 339             seed_optarg = optarg;
 340         } else if (!strcmp(r, "singlestep")) {
 341             singlestep = 1;
 342         } else if (!strcmp(r, "strace")) {
 343             do_strace = 1;
 344         } else if (!strcmp(r, "trace")) {
 345             trace_opt_parse(optarg);
 346         } else {
 347             usage();
 348         }
 349     }
 350
 351     /* init debug */
 352     qemu_log_needs_buffers();
 353     qemu_set_log_filename(log_file, &error_fatal);
 354     if (log_mask) {
 355         int mask;
 356
 357         mask = qemu_str_to_log_mask(log_mask);
 358         if (!mask) {
 359             qemu_print_log_usage(stdout);
 360             exit(1);
 361         }
 362         qemu_set_log(mask);
 363     }
 364
 365     if (optind >= argc) {
 366         usage();
 367     }
 368     filename = argv[optind];
 369
 370     if (!trace_init_backends()) {
 371         exit(1);
 372     }
 373     trace_init_file();
 374
 375     /* Zero out regs */
 376     memset(regs, 0, sizeof(struct target_pt_regs));
 377
 378     /* Zero bsd params */
 379     memset(&bprm, 0, sizeof(bprm));
 380
 381     /* Zero out image_info */
 382     memset(info, 0, sizeof(struct image_info));
 383
 384     /* Scan interp_prefix dir for replacement files. */
 385     init_paths(interp_prefix);
 386
 387     if (cpu_model == NULL) {
 388         cpu_model = TARGET_DEFAULT_CPU_MODEL;
 389     }
 390
 391     cpu_type = parse_cpu_option(cpu_model);
 392
 393     /* init tcg before creating CPUs and to get qemu_host_page_size */
 394     {
 395         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 396
 397         accel_init_interfaces(ac);
 398         ac->init_machine(NULL);
 399     }
 400     cpu = cpu_create(cpu_type);
 401     env = cpu->env_ptr;
 402     cpu_reset(cpu);
 403     thread_cpu = cpu;
 404
 405     if (getenv("QEMU_STRACE")) {
 406         do_strace = 1;
 407     }
 408
 409     target_environ = envlist_to_environ(envlist, NULL);
 410     envlist_free(envlist);
 411
 412     {
 413         Error *err = NULL;
 414         if (seed_optarg != NULL) {
 415             qemu_guest_random_seed_main(seed_optarg, &err);
 416         } else {
 417             qcrypto_init(&err);
 418         }
 419         if (err) {
 420             error_reportf_err(err, "cannot initialize crypto: ");
 421             exit(1);
 422         }
 423     }
 424
 425     /*
 426      * Now that page sizes are configured we can do
 427      * proper page alignment for guest_base.
 428      */
 429     guest_base = HOST_PAGE_ALIGN(guest_base);
 430
 431     if (loader_exec(filename, argv + optind, target_environ, regs, info,
 432                     &bprm) != 0) {
 433         printf("Error loading %s\n", filename);
 434         _exit(1);
 435     }
 436
 437     for (wrk = target_environ; *wrk; wrk++) {
 438         g_free(*wrk);
 439     }
 440
 441     g_free(target_environ);
 442
 443     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 444         qemu_log("guest_base  %p\n", (void *)guest_base);
 445         log_page_dump("binary load");
 446
 447         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 448         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 449         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
 450                  info->start_code);
 451         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
 452                  info->start_data);
 453         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 454         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
 455                  info->start_stack);
 456         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 457         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 458     }
 459
 460     /* build Task State */
 461     ts = g_new0(TaskState, 1);
 462     init_task_state(ts);
 463     ts->info = info;
 464     ts->bprm = &bprm;
 465     cpu->opaque = ts;
 466
 467     target_set_brk(info->brk);
 468     syscall_init();
 469     signal_init();
 470
 471     /*
 472      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 473      * generating the prologue until now so that the prologue can take
 474      * the real value of GUEST_BASE into account.
 475      */
 476     tcg_prologue_init(tcg_ctx);
 477
 478     target_cpu_init(env, regs);
 479
 480     if (gdbstub) {
 481         gdbserver_start(gdbstub);
 482         gdb_handlesig(cpu, 0);
 483     }
 484     cpu_loop(env);
 485     /* never exits */
 486     return 0;
 487 }