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 uintptr_t guest_base;
  56 bool have_guest_base;
  57 /*
  58  * When running 32-on-64 we should make sure we can fit all of the possible
  59  * guest address space into a contiguous chunk of virtual host memory.
  60  *
  61  * This way we will never overlap with our own libraries or binaries or stack
  62  * or anything else that QEMU maps.
  63  *
  64  * Many cpus reserve the high bit (or more than one for some 64-bit cpus)
  65  * of the address for the kernel.  Some cpus rely on this and user space
  66  * uses the high bit(s) for pointer tagging and the like.  For them, we
  67  * must preserve the expected address space.
  68  */
  69 #ifndef MAX_RESERVED_VA
  70 # if HOST_LONG_BITS > TARGET_VIRT_ADDR_SPACE_BITS
  71 #  if TARGET_VIRT_ADDR_SPACE_BITS == 32 && \
  72       (TARGET_LONG_BITS == 32 || defined(TARGET_ABI32))
  73 /*
  74  * There are a number of places where we assign reserved_va to a variable
  75  * of type abi_ulong and expect it to fit.  Avoid the last page.
  76  */
  77 #   define MAX_RESERVED_VA  (0xfffffffful & TARGET_PAGE_MASK)
  78 #  else
  79 #   define MAX_RESERVED_VA  (1ul << TARGET_VIRT_ADDR_SPACE_BITS)
  80 #  endif
  81 # else
  82 #  define MAX_RESERVED_VA  0
  83 # endif
  84 #endif
  85
  86 /*
  87  * That said, reserving *too* much vm space via mmap can run into problems
  88  * with rlimits, oom due to page table creation, etc.  We will still try it,
  89  * if directed by the command-line option, but not by default.
  90  */
  91 #if HOST_LONG_BITS == 64 && TARGET_VIRT_ADDR_SPACE_BITS <= 32
  92 unsigned long reserved_va = MAX_RESERVED_VA;
  93 #else
  94 unsigned long reserved_va;
  95 #endif
  96
  97 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
  98 const char *qemu_uname_release;
  99 enum BSDType bsd_type;
 100 char qemu_proc_pathname[PATH_MAX];  /* full path to exeutable */
 101
 102 unsigned long target_maxtsiz = TARGET_MAXTSIZ;   /* max text size */
 103 unsigned long target_dfldsiz = TARGET_DFLDSIZ;   /* initial data size limit */
 104 unsigned long target_maxdsiz = TARGET_MAXDSIZ;   /* max data size */
 105 unsigned long target_dflssiz = TARGET_DFLSSIZ;   /* initial data size limit */
 106 unsigned long target_maxssiz = TARGET_MAXSSIZ;   /* max stack size */
 107 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
 108
 109 /* Helper routines for implementing atomic operations. */
 110
 111 void fork_start(void)
 112 {
 113     start_exclusive();
 114     cpu_list_lock();
 115     mmap_fork_start();
 116 }
 117
 118 void fork_end(int child)
 119 {
 120     if (child) {
 121         CPUState *cpu, *next_cpu;
 122         /*
 123          * Child processes created by fork() only have a single thread.  Discard
 124          * information about the parent threads.
 125          */
 126         CPU_FOREACH_SAFE(cpu, next_cpu) {
 127             if (cpu != thread_cpu) {
 128                 QTAILQ_REMOVE_RCU(&cpus, cpu, node);
 129             }
 130         }
 131         mmap_fork_end(child);
 132         /*
 133          * qemu_init_cpu_list() takes care of reinitializing the exclusive
 134          * state, so we don't need to end_exclusive() here.
 135          */
 136         qemu_init_cpu_list();
 137         gdbserver_fork(thread_cpu);
 138     } else {
 139         mmap_fork_end(child);
 140         cpu_list_unlock();
 141         end_exclusive();
 142     }
 143 }
 144
 145 void cpu_loop(CPUArchState *env)
 146 {
 147     target_cpu_loop(env);
 148 }
 149
 150 static void usage(void)
 151 {
 152     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
 153            "\n" QEMU_COPYRIGHT "\n"
 154            "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
 155            "BSD CPU emulator (compiled for %s emulation)\n"
 156            "\n"
 157            "Standard options:\n"
 158            "-h                print this help\n"
 159            "-g port           wait gdb connection to port\n"
 160            "-L path           set the elf interpreter prefix (default=%s)\n"
 161            "-s size           set the stack size in bytes (default=%ld)\n"
 162            "-cpu model        select CPU (-cpu help for list)\n"
 163            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
 164            "-E var=value      sets/modifies targets environment variable(s)\n"
 165            "-U var            unsets targets environment variable(s)\n"
 166            "-B address        set guest_base address to address\n"
 167            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
 168            "\n"
 169            "Debug options:\n"
 170            "-d item1[,...]    enable logging of specified items\n"
 171            "                  (use '-d help' for a list of log items)\n"
 172            "-D logfile        write logs to 'logfile' (default stderr)\n"
 173            "-singlestep       always run in singlestep mode\n"
 174            "-strace           log system calls\n"
 175            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
 176            "                  specify tracing options\n"
 177            "\n"
 178            "Environment variables:\n"
 179            "QEMU_STRACE       Print system calls and arguments similar to the\n"
 180            "                  'strace' program.  Enable by setting to any value.\n"
 181            "You can use -E and -U options to set/unset environment variables\n"
 182            "for target process.  It is possible to provide several variables\n"
 183            "by repeating the option.  For example:\n"
 184            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 185            "Note that if you provide several changes to single variable\n"
 186            "last change will stay in effect.\n"
 187            "\n"
 188            QEMU_HELP_BOTTOM "\n"
 189            ,
 190            TARGET_NAME,
 191            interp_prefix,
 192            target_dflssiz);
 193     exit(1);
 194 }
 195
 196 __thread CPUState *thread_cpu;
 197
 198 bool qemu_cpu_is_self(CPUState *cpu)
 199 {
 200     return thread_cpu == cpu;
 201 }
 202
 203 void qemu_cpu_kick(CPUState *cpu)
 204 {
 205     cpu_exit(cpu);
 206 }
 207
 208 /* Assumes contents are already zeroed.  */
 209 void init_task_state(TaskState *ts)
 210 {
 211     int i;
 212
 213     ts->used = 1;
 214     ts->first_free = ts->sigqueue_table;
 215     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
 216         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
 217     }
 218     ts->sigqueue_table[i].next = NULL;
 219 }
 220
 221 void gemu_log(const char *fmt, ...)
 222 {
 223     va_list ap;
 224
 225     va_start(ap, fmt);
 226     vfprintf(stderr, fmt, ap);
 227     va_end(ap);
 228 }
 229
 230 static void
 231 adjust_ssize(void)
 232 {
 233     struct rlimit rl;
 234
 235     if (getrlimit(RLIMIT_STACK, &rl) != 0) {
 236         return;
 237     }
 238
 239     target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
 240     target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
 241
 242     rl.rlim_max = target_maxssiz;
 243     rl.rlim_cur = target_dflssiz;
 244     setrlimit(RLIMIT_STACK, &rl);
 245 }
 246
 247 static void save_proc_pathname(char *argv0)
 248 {
 249     int mib[4];
 250     size_t len;
 251
 252     mib[0] = CTL_KERN;
 253     mib[1] = KERN_PROC;
 254     mib[2] = KERN_PROC_PATHNAME;
 255     mib[3] = -1;
 256
 257     len = sizeof(qemu_proc_pathname);
 258     if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
 259         perror("sysctl");
 260     }
 261 }
 262
 263 int main(int argc, char **argv)
 264 {
 265     const char *filename;
 266     const char *cpu_model;
 267     const char *cpu_type;
 268     const char *log_file = NULL;
 269     const char *log_mask = NULL;
 270     const char *seed_optarg = NULL;
 271     struct target_pt_regs regs1, *regs = &regs1;
 272     struct image_info info1, *info = &info1;
 273     struct bsd_binprm bprm;
 274     TaskState *ts;
 275     CPUArchState *env;
 276     CPUState *cpu;
 277     int optind, rv;
 278     const char *r;
 279     const char *gdbstub = NULL;
 280     char **target_environ, **wrk;
 281     envlist_t *envlist = NULL;
 282     bsd_type = HOST_DEFAULT_BSD_TYPE;
 283     char *argv0 = NULL;
 284
 285     adjust_ssize();
 286
 287     if (argc <= 1) {
 288         usage();
 289     }
 290
 291     save_proc_pathname(argv[0]);
 292
 293     error_init(argv[0]);
 294     module_call_init(MODULE_INIT_TRACE);
 295     qemu_init_cpu_list();
 296     module_call_init(MODULE_INIT_QOM);
 297
 298     envlist = envlist_create();
 299
 300     /* add current environment into the list */
 301     for (wrk = environ; *wrk != NULL; wrk++) {
 302         (void) envlist_setenv(envlist, *wrk);
 303     }
 304
 305     cpu_model = NULL;
 306
 307     qemu_add_opts(&qemu_trace_opts);
 308
 309     optind = 1;
 310     for (;;) {
 311         if (optind >= argc) {
 312             break;
 313         }
 314         r = argv[optind];
 315         if (r[0] != '-') {
 316             break;
 317         }
 318         optind++;
 319         r++;
 320         if (!strcmp(r, "-")) {
 321             break;
 322         } else if (!strcmp(r, "d")) {
 323             if (optind >= argc) {
 324                 break;
 325             }
 326             log_mask = argv[optind++];
 327         } else if (!strcmp(r, "D")) {
 328             if (optind >= argc) {
 329                 break;
 330             }
 331             log_file = argv[optind++];
 332         } else if (!strcmp(r, "E")) {
 333             r = argv[optind++];
 334             if (envlist_setenv(envlist, r) != 0) {
 335                 usage();
 336             }
 337         } else if (!strcmp(r, "ignore-environment")) {
 338             envlist_free(envlist);
 339             envlist = envlist_create();
 340         } else if (!strcmp(r, "U")) {
 341             r = argv[optind++];
 342             if (envlist_unsetenv(envlist, r) != 0) {
 343                 usage();
 344             }
 345         } else if (!strcmp(r, "s")) {
 346             r = argv[optind++];
 347             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
 348             if (rv < 0 || target_dflssiz <= 0) {
 349                 usage();
 350             }
 351             if (*r == 'M') {
 352                 target_dflssiz *= 1024 * 1024;
 353             } else if (*r == 'k' || *r == 'K') {
 354                 target_dflssiz *= 1024;
 355             }
 356             if (target_dflssiz > target_maxssiz) {
 357                 usage();
 358             }
 359         } else if (!strcmp(r, "L")) {
 360             interp_prefix = argv[optind++];
 361         } else if (!strcmp(r, "p")) {
 362             qemu_host_page_size = atoi(argv[optind++]);
 363             if (qemu_host_page_size == 0 ||
 364                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 365                 fprintf(stderr, "page size must be a power of two\n");
 366                 exit(1);
 367             }
 368         } else if (!strcmp(r, "g")) {
 369             gdbstub = g_strdup(argv[optind++]);
 370         } else if (!strcmp(r, "r")) {
 371             qemu_uname_release = argv[optind++];
 372         } else if (!strcmp(r, "cpu")) {
 373             cpu_model = argv[optind++];
 374             if (is_help_option(cpu_model)) {
 375                 /* XXX: implement xxx_cpu_list for targets that still miss it */
 376 #if defined(cpu_list)
 377                 cpu_list();
 378 #endif
 379                 exit(1);
 380             }
 381         } else if (!strcmp(r, "B")) {
 382             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
 383             if (rv < 0) {
 384                 usage();
 385             }
 386             have_guest_base = true;
 387         } else if (!strcmp(r, "drop-ld-preload")) {
 388             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
 389         } else if (!strcmp(r, "bsd")) {
 390             if (!strcasecmp(argv[optind], "freebsd")) {
 391                 bsd_type = target_freebsd;
 392             } else if (!strcasecmp(argv[optind], "netbsd")) {
 393                 bsd_type = target_netbsd;
 394             } else if (!strcasecmp(argv[optind], "openbsd")) {
 395                 bsd_type = target_openbsd;
 396             } else {
 397                 usage();
 398             }
 399             optind++;
 400         } else if (!strcmp(r, "seed")) {
 401             seed_optarg = optarg;
 402         } else if (!strcmp(r, "singlestep")) {
 403             singlestep = 1;
 404         } else if (!strcmp(r, "strace")) {
 405             do_strace = 1;
 406         } else if (!strcmp(r, "trace")) {
 407             trace_opt_parse(optarg);
 408         } else if (!strcmp(r, "0")) {
 409             argv0 = argv[optind++];
 410         } else {
 411             usage();
 412         }
 413     }
 414
 415     /* init debug */
 416     qemu_log_needs_buffers();
 417     qemu_set_log_filename(log_file, &error_fatal);
 418     if (log_mask) {
 419         int mask;
 420
 421         mask = qemu_str_to_log_mask(log_mask);
 422         if (!mask) {
 423             qemu_print_log_usage(stdout);
 424             exit(1);
 425         }
 426         qemu_set_log(mask);
 427     }
 428
 429     if (optind >= argc) {
 430         usage();
 431     }
 432     filename = argv[optind];
 433     if (argv0) {
 434         argv[optind] = argv0;
 435     }
 436
 437     if (!trace_init_backends()) {
 438         exit(1);
 439     }
 440     trace_init_file();
 441
 442     /* Zero out regs */
 443     memset(regs, 0, sizeof(struct target_pt_regs));
 444
 445     /* Zero bsd params */
 446     memset(&bprm, 0, sizeof(bprm));
 447
 448     /* Zero out image_info */
 449     memset(info, 0, sizeof(struct image_info));
 450
 451     /* Scan interp_prefix dir for replacement files. */
 452     init_paths(interp_prefix);
 453
 454     if (cpu_model == NULL) {
 455         cpu_model = TARGET_DEFAULT_CPU_MODEL;
 456     }
 457
 458     cpu_type = parse_cpu_option(cpu_model);
 459
 460     /* init tcg before creating CPUs and to get qemu_host_page_size */
 461     {
 462         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 463
 464         accel_init_interfaces(ac);
 465         ac->init_machine(NULL);
 466     }
 467     cpu = cpu_create(cpu_type);
 468     env = cpu->env_ptr;
 469     cpu_reset(cpu);
 470     thread_cpu = cpu;
 471
 472     if (getenv("QEMU_STRACE")) {
 473         do_strace = 1;
 474     }
 475
 476     target_environ = envlist_to_environ(envlist, NULL);
 477     envlist_free(envlist);
 478
 479     if (reserved_va) {
 480             mmap_next_start = reserved_va;
 481     }
 482
 483     {
 484         Error *err = NULL;
 485         if (seed_optarg != NULL) {
 486             qemu_guest_random_seed_main(seed_optarg, &err);
 487         } else {
 488             qcrypto_init(&err);
 489         }
 490         if (err) {
 491             error_reportf_err(err, "cannot initialize crypto: ");
 492             exit(1);
 493         }
 494     }
 495
 496     /*
 497      * Now that page sizes are configured we can do
 498      * proper page alignment for guest_base.
 499      */
 500     guest_base = HOST_PAGE_ALIGN(guest_base);
 501
 502     if (loader_exec(filename, argv + optind, target_environ, regs, info,
 503                     &bprm) != 0) {
 504         printf("Error loading %s\n", filename);
 505         _exit(1);
 506     }
 507
 508     for (wrk = target_environ; *wrk; wrk++) {
 509         g_free(*wrk);
 510     }
 511
 512     g_free(target_environ);
 513
 514     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 515         qemu_log("guest_base  %p\n", (void *)guest_base);
 516         log_page_dump("binary load");
 517
 518         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 519         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 520         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
 521                  info->start_code);
 522         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
 523                  info->start_data);
 524         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 525         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
 526                  info->start_stack);
 527         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 528         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 529     }
 530
 531     /* build Task State */
 532     ts = g_new0(TaskState, 1);
 533     init_task_state(ts);
 534     ts->info = info;
 535     ts->bprm = &bprm;
 536     cpu->opaque = ts;
 537
 538     target_set_brk(info->brk);
 539     syscall_init();
 540     signal_init();
 541
 542     /*
 543      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 544      * generating the prologue until now so that the prologue can take
 545      * the real value of GUEST_BASE into account.
 546      */
 547     tcg_prologue_init(tcg_ctx);
 548
 549     target_cpu_init(env, regs);
 550
 551     if (gdbstub) {
 552         gdbserver_start(gdbstub);
 553         gdb_handlesig(cpu, 0);
 554     }
 555     cpu_loop(env);
 556     /* never exits */
 557     return 0;
 558 }