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
 247     adjust_ssize();
 248
 249     if (argc <= 1) {
 250         usage();
 251     }
 252
 253     save_proc_pathname(argv[0]);
 254
 255     error_init(argv[0]);
 256     module_call_init(MODULE_INIT_TRACE);
 257     qemu_init_cpu_list();
 258     module_call_init(MODULE_INIT_QOM);
 259
 260     envlist = envlist_create();
 261
 262     /* add current environment into the list */
 263     for (wrk = environ; *wrk != NULL; wrk++) {
 264         (void) envlist_setenv(envlist, *wrk);
 265     }
 266
 267     cpu_model = NULL;
 268
 269     qemu_add_opts(&qemu_trace_opts);
 270
 271     optind = 1;
 272     for (;;) {
 273         if (optind >= argc) {
 274             break;
 275         }
 276         r = argv[optind];
 277         if (r[0] != '-') {
 278             break;
 279         }
 280         optind++;
 281         r++;
 282         if (!strcmp(r, "-")) {
 283             break;
 284         } else if (!strcmp(r, "d")) {
 285             if (optind >= argc) {
 286                 break;
 287             }
 288             log_mask = argv[optind++];
 289         } else if (!strcmp(r, "D")) {
 290             if (optind >= argc) {
 291                 break;
 292             }
 293             log_file = argv[optind++];
 294         } else if (!strcmp(r, "E")) {
 295             r = argv[optind++];
 296             if (envlist_setenv(envlist, r) != 0) {
 297                 usage();
 298             }
 299         } else if (!strcmp(r, "ignore-environment")) {
 300             envlist_free(envlist);
 301             envlist = envlist_create();
 302         } else if (!strcmp(r, "U")) {
 303             r = argv[optind++];
 304             if (envlist_unsetenv(envlist, r) != 0) {
 305                 usage();
 306             }
 307         } else if (!strcmp(r, "s")) {
 308             r = argv[optind++];
 309             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
 310             if (rv < 0 || target_dflssiz <= 0) {
 311                 usage();
 312             }
 313             if (*r == 'M') {
 314                 target_dflssiz *= 1024 * 1024;
 315             } else if (*r == 'k' || *r == 'K') {
 316                 target_dflssiz *= 1024;
 317             }
 318             if (target_dflssiz > target_maxssiz) {
 319                 usage();
 320             }
 321         } else if (!strcmp(r, "L")) {
 322             interp_prefix = argv[optind++];
 323         } else if (!strcmp(r, "p")) {
 324             qemu_host_page_size = atoi(argv[optind++]);
 325             if (qemu_host_page_size == 0 ||
 326                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 327                 fprintf(stderr, "page size must be a power of two\n");
 328                 exit(1);
 329             }
 330         } else if (!strcmp(r, "g")) {
 331             gdbstub = g_strdup(argv[optind++]);
 332         } else if (!strcmp(r, "r")) {
 333             qemu_uname_release = argv[optind++];
 334         } else if (!strcmp(r, "cpu")) {
 335             cpu_model = argv[optind++];
 336             if (is_help_option(cpu_model)) {
 337                 /* XXX: implement xxx_cpu_list for targets that still miss it */
 338 #if defined(cpu_list)
 339                 cpu_list();
 340 #endif
 341                 exit(1);
 342             }
 343         } else if (!strcmp(r, "B")) {
 344             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
 345             if (rv < 0) {
 346                 usage();
 347             }
 348             have_guest_base = true;
 349         } else if (!strcmp(r, "drop-ld-preload")) {
 350             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
 351         } else if (!strcmp(r, "bsd")) {
 352             if (!strcasecmp(argv[optind], "freebsd")) {
 353                 bsd_type = target_freebsd;
 354             } else if (!strcasecmp(argv[optind], "netbsd")) {
 355                 bsd_type = target_netbsd;
 356             } else if (!strcasecmp(argv[optind], "openbsd")) {
 357                 bsd_type = target_openbsd;
 358             } else {
 359                 usage();
 360             }
 361             optind++;
 362         } else if (!strcmp(r, "seed")) {
 363             seed_optarg = optarg;
 364         } else if (!strcmp(r, "singlestep")) {
 365             singlestep = 1;
 366         } else if (!strcmp(r, "strace")) {
 367             do_strace = 1;
 368         } else if (!strcmp(r, "trace")) {
 369             trace_opt_parse(optarg);
 370         } else {
 371             usage();
 372         }
 373     }
 374
 375     /* init debug */
 376     qemu_log_needs_buffers();
 377     qemu_set_log_filename(log_file, &error_fatal);
 378     if (log_mask) {
 379         int mask;
 380
 381         mask = qemu_str_to_log_mask(log_mask);
 382         if (!mask) {
 383             qemu_print_log_usage(stdout);
 384             exit(1);
 385         }
 386         qemu_set_log(mask);
 387     }
 388
 389     if (optind >= argc) {
 390         usage();
 391     }
 392     filename = argv[optind];
 393
 394     if (!trace_init_backends()) {
 395         exit(1);
 396     }
 397     trace_init_file();
 398
 399     /* Zero out regs */
 400     memset(regs, 0, sizeof(struct target_pt_regs));
 401
 402     /* Zero bsd params */
 403     memset(&bprm, 0, sizeof(bprm));
 404
 405     /* Zero out image_info */
 406     memset(info, 0, sizeof(struct image_info));
 407
 408     /* Scan interp_prefix dir for replacement files. */
 409     init_paths(interp_prefix);
 410
 411     if (cpu_model == NULL) {
 412         cpu_model = TARGET_DEFAULT_CPU_MODEL;
 413     }
 414
 415     cpu_type = parse_cpu_option(cpu_model);
 416
 417     /* init tcg before creating CPUs and to get qemu_host_page_size */
 418     {
 419         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 420
 421         accel_init_interfaces(ac);
 422         ac->init_machine(NULL);
 423     }
 424     cpu = cpu_create(cpu_type);
 425     env = cpu->env_ptr;
 426     cpu_reset(cpu);
 427     thread_cpu = cpu;
 428
 429     if (getenv("QEMU_STRACE")) {
 430         do_strace = 1;
 431     }
 432
 433     target_environ = envlist_to_environ(envlist, NULL);
 434     envlist_free(envlist);
 435
 436     {
 437         Error *err = NULL;
 438         if (seed_optarg != NULL) {
 439             qemu_guest_random_seed_main(seed_optarg, &err);
 440         } else {
 441             qcrypto_init(&err);
 442         }
 443         if (err) {
 444             error_reportf_err(err, "cannot initialize crypto: ");
 445             exit(1);
 446         }
 447     }
 448
 449     /*
 450      * Now that page sizes are configured we can do
 451      * proper page alignment for guest_base.
 452      */
 453     guest_base = HOST_PAGE_ALIGN(guest_base);
 454
 455     if (loader_exec(filename, argv + optind, target_environ, regs, info,
 456                     &bprm) != 0) {
 457         printf("Error loading %s\n", filename);
 458         _exit(1);
 459     }
 460
 461     for (wrk = target_environ; *wrk; wrk++) {
 462         g_free(*wrk);
 463     }
 464
 465     g_free(target_environ);
 466
 467     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 468         qemu_log("guest_base  %p\n", (void *)guest_base);
 469         log_page_dump("binary load");
 470
 471         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 472         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 473         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
 474                  info->start_code);
 475         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
 476                  info->start_data);
 477         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 478         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
 479                  info->start_stack);
 480         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 481         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 482     }
 483
 484     /* build Task State */
 485     ts = g_new0(TaskState, 1);
 486     init_task_state(ts);
 487     ts->info = info;
 488     ts->bprm = &bprm;
 489     cpu->opaque = ts;
 490
 491     target_set_brk(info->brk);
 492     syscall_init();
 493     signal_init();
 494
 495     /*
 496      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 497      * generating the prologue until now so that the prologue can take
 498      * the real value of GUEST_BASE into account.
 499      */
 500     tcg_prologue_init(tcg_ctx);
 501
 502     target_cpu_init(env, regs);
 503
 504     if (gdbstub) {
 505         gdbserver_start(gdbstub);
 506         gdb_handlesig(cpu, 0);
 507     }
 508     cpu_loop(env);
 509     /* never exits */
 510     return 0;
 511 }