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
  49 #include "host-os.h"
  50 #include "target_arch_cpu.h"
  51
  52 int singlestep;
  53 unsigned long mmap_min_addr;
  54 uintptr_t guest_base;
  55 bool have_guest_base;
  56 unsigned long reserved_va;
  57
  58 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
  59 const char *qemu_uname_release;
  60 enum BSDType bsd_type;
  61 char qemu_proc_pathname[PATH_MAX];  /* full path to exeutable */
  62
  63 unsigned long target_maxtsiz = TARGET_MAXTSIZ;   /* max text size */
  64 unsigned long target_dfldsiz = TARGET_DFLDSIZ;   /* initial data size limit */
  65 unsigned long target_maxdsiz = TARGET_MAXDSIZ;   /* max data size */
  66 unsigned long target_dflssiz = TARGET_DFLSSIZ;   /* initial data size limit */
  67 unsigned long target_maxssiz = TARGET_MAXSSIZ;   /* max stack size */
  68 unsigned long target_sgrowsiz = TARGET_SGROWSIZ; /* amount to grow stack */
  69
  70 void gemu_log(const char *fmt, ...)
  71 {
  72     va_list ap;
  73
  74     va_start(ap, fmt);
  75     vfprintf(stderr, fmt, ap);
  76     va_end(ap);
  77 }
  78
  79 void fork_start(void)
  80 {
  81 }
  82
  83 void fork_end(int child)
  84 {
  85     if (child) {
  86         gdbserver_fork(thread_cpu);
  87     }
  88 }
  89
  90 void cpu_loop(CPUArchState *env)
  91 {
  92     target_cpu_loop(env);
  93 }
  94
  95 static void usage(void)
  96 {
  97     printf("qemu-" TARGET_NAME " version " QEMU_FULL_VERSION
  98            "\n" QEMU_COPYRIGHT "\n"
  99            "usage: qemu-" TARGET_NAME " [options] program [arguments...]\n"
 100            "BSD CPU emulator (compiled for %s emulation)\n"
 101            "\n"
 102            "Standard options:\n"
 103            "-h                print this help\n"
 104            "-g port           wait gdb connection to port\n"
 105            "-L path           set the elf interpreter prefix (default=%s)\n"
 106            "-s size           set the stack size in bytes (default=%ld)\n"
 107            "-cpu model        select CPU (-cpu help for list)\n"
 108            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
 109            "-E var=value      sets/modifies targets environment variable(s)\n"
 110            "-U var            unsets targets environment variable(s)\n"
 111            "-B address        set guest_base address to address\n"
 112            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
 113            "\n"
 114            "Debug options:\n"
 115            "-d item1[,...]    enable logging of specified items\n"
 116            "                  (use '-d help' for a list of log items)\n"
 117            "-D logfile        write logs to 'logfile' (default stderr)\n"
 118            "-singlestep       always run in singlestep mode\n"
 119            "-strace           log system calls\n"
 120            "-trace            [[enable=]<pattern>][,events=<file>][,file=<file>]\n"
 121            "                  specify tracing options\n"
 122            "\n"
 123            "Environment variables:\n"
 124            "QEMU_STRACE       Print system calls and arguments similar to the\n"
 125            "                  'strace' program.  Enable by setting to any value.\n"
 126            "You can use -E and -U options to set/unset environment variables\n"
 127            "for target process.  It is possible to provide several variables\n"
 128            "by repeating the option.  For example:\n"
 129            "    -E var1=val2 -E var2=val2 -U LD_PRELOAD -U LD_DEBUG\n"
 130            "Note that if you provide several changes to single variable\n"
 131            "last change will stay in effect.\n"
 132            "\n"
 133            QEMU_HELP_BOTTOM "\n"
 134            ,
 135            TARGET_NAME,
 136            interp_prefix,
 137            target_dflssiz);
 138     exit(1);
 139 }
 140
 141 __thread CPUState *thread_cpu;
 142
 143 bool qemu_cpu_is_self(CPUState *cpu)
 144 {
 145     return thread_cpu == cpu;
 146 }
 147
 148 void qemu_cpu_kick(CPUState *cpu)
 149 {
 150     cpu_exit(cpu);
 151 }
 152
 153 /* Assumes contents are already zeroed.  */
 154 void init_task_state(TaskState *ts)
 155 {
 156     int i;
 157
 158     ts->used = 1;
 159     ts->first_free = ts->sigqueue_table;
 160     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
 161         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
 162     }
 163     ts->sigqueue_table[i].next = NULL;
 164 }
 165
 166 static void
 167 adjust_ssize(void)
 168 {
 169     struct rlimit rl;
 170
 171     if (getrlimit(RLIMIT_STACK, &rl) != 0) {
 172         return;
 173     }
 174
 175     target_maxssiz = MIN(target_maxssiz, rl.rlim_max);
 176     target_dflssiz = MIN(MAX(target_dflssiz, rl.rlim_cur), target_maxssiz);
 177
 178     rl.rlim_max = target_maxssiz;
 179     rl.rlim_cur = target_dflssiz;
 180     setrlimit(RLIMIT_STACK, &rl);
 181 }
 182
 183 static void save_proc_pathname(char *argv0)
 184 {
 185     int mib[4];
 186     size_t len;
 187
 188     mib[0] = CTL_KERN;
 189     mib[1] = KERN_PROC;
 190     mib[2] = KERN_PROC_PATHNAME;
 191     mib[3] = -1;
 192
 193     len = sizeof(qemu_proc_pathname);
 194     if (sysctl(mib, 4, qemu_proc_pathname, &len, NULL, 0)) {
 195         perror("sysctl");
 196     }
 197 }
 198
 199 int main(int argc, char **argv)
 200 {
 201     const char *filename;
 202     const char *cpu_model;
 203     const char *cpu_type;
 204     const char *log_file = NULL;
 205     const char *log_mask = NULL;
 206     struct target_pt_regs regs1, *regs = &regs1;
 207     struct image_info info1, *info = &info1;
 208     struct bsd_binprm bprm;
 209     TaskState *ts;
 210     CPUArchState *env;
 211     CPUState *cpu;
 212     int optind, rv;
 213     const char *r;
 214     const char *gdbstub = NULL;
 215     char **target_environ, **wrk;
 216     envlist_t *envlist = NULL;
 217     bsd_type = HOST_DEFAULT_BSD_TYPE;
 218
 219     adjust_ssize();
 220
 221     if (argc <= 1) {
 222         usage();
 223     }
 224
 225     save_proc_pathname(argv[0]);
 226
 227     error_init(argv[0]);
 228     module_call_init(MODULE_INIT_TRACE);
 229     qemu_init_cpu_list();
 230     module_call_init(MODULE_INIT_QOM);
 231
 232     envlist = envlist_create();
 233
 234     /* add current environment into the list */
 235     for (wrk = environ; *wrk != NULL; wrk++) {
 236         (void) envlist_setenv(envlist, *wrk);
 237     }
 238
 239     cpu_model = NULL;
 240
 241     qemu_add_opts(&qemu_trace_opts);
 242
 243     optind = 1;
 244     for (;;) {
 245         if (optind >= argc) {
 246             break;
 247         }
 248         r = argv[optind];
 249         if (r[0] != '-') {
 250             break;
 251         }
 252         optind++;
 253         r++;
 254         if (!strcmp(r, "-")) {
 255             break;
 256         } else if (!strcmp(r, "d")) {
 257             if (optind >= argc) {
 258                 break;
 259             }
 260             log_mask = argv[optind++];
 261         } else if (!strcmp(r, "D")) {
 262             if (optind >= argc) {
 263                 break;
 264             }
 265             log_file = argv[optind++];
 266         } else if (!strcmp(r, "E")) {
 267             r = argv[optind++];
 268             if (envlist_setenv(envlist, r) != 0) {
 269                 usage();
 270             }
 271         } else if (!strcmp(r, "ignore-environment")) {
 272             envlist_free(envlist);
 273             envlist = envlist_create();
 274         } else if (!strcmp(r, "U")) {
 275             r = argv[optind++];
 276             if (envlist_unsetenv(envlist, r) != 0) {
 277                 usage();
 278             }
 279         } else if (!strcmp(r, "s")) {
 280             r = argv[optind++];
 281             rv = qemu_strtoul(r, &r, 0, &target_dflssiz);
 282             if (rv < 0 || target_dflssiz <= 0) {
 283                 usage();
 284             }
 285             if (*r == 'M') {
 286                 target_dflssiz *= 1024 * 1024;
 287             } else if (*r == 'k' || *r == 'K') {
 288                 target_dflssiz *= 1024;
 289             }
 290             if (target_dflssiz > target_maxssiz) {
 291                 usage();
 292             }
 293         } else if (!strcmp(r, "L")) {
 294             interp_prefix = argv[optind++];
 295         } else if (!strcmp(r, "p")) {
 296             qemu_host_page_size = atoi(argv[optind++]);
 297             if (qemu_host_page_size == 0 ||
 298                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 299                 fprintf(stderr, "page size must be a power of two\n");
 300                 exit(1);
 301             }
 302         } else if (!strcmp(r, "g")) {
 303             gdbstub = g_strdup(argv[optind++]);
 304         } else if (!strcmp(r, "r")) {
 305             qemu_uname_release = argv[optind++];
 306         } else if (!strcmp(r, "cpu")) {
 307             cpu_model = argv[optind++];
 308             if (is_help_option(cpu_model)) {
 309                 /* XXX: implement xxx_cpu_list for targets that still miss it */
 310 #if defined(cpu_list)
 311                 cpu_list();
 312 #endif
 313                 exit(1);
 314             }
 315         } else if (!strcmp(r, "B")) {
 316             rv = qemu_strtoul(argv[optind++], NULL, 0, &guest_base);
 317             if (rv < 0) {
 318                 usage();
 319             }
 320             have_guest_base = true;
 321         } else if (!strcmp(r, "drop-ld-preload")) {
 322             (void) envlist_unsetenv(envlist, "LD_PRELOAD");
 323         } else if (!strcmp(r, "bsd")) {
 324             if (!strcasecmp(argv[optind], "freebsd")) {
 325                 bsd_type = target_freebsd;
 326             } else if (!strcasecmp(argv[optind], "netbsd")) {
 327                 bsd_type = target_netbsd;
 328             } else if (!strcasecmp(argv[optind], "openbsd")) {
 329                 bsd_type = target_openbsd;
 330             } else {
 331                 usage();
 332             }
 333             optind++;
 334         } else if (!strcmp(r, "singlestep")) {
 335             singlestep = 1;
 336         } else if (!strcmp(r, "strace")) {
 337             do_strace = 1;
 338         } else if (!strcmp(r, "trace")) {
 339             trace_opt_parse(optarg);
 340         } else {
 341             usage();
 342         }
 343     }
 344
 345     /* init debug */
 346     qemu_log_needs_buffers();
 347     qemu_set_log_filename(log_file, &error_fatal);
 348     if (log_mask) {
 349         int mask;
 350
 351         mask = qemu_str_to_log_mask(log_mask);
 352         if (!mask) {
 353             qemu_print_log_usage(stdout);
 354             exit(1);
 355         }
 356         qemu_set_log(mask);
 357     }
 358
 359     if (optind >= argc) {
 360         usage();
 361     }
 362     filename = argv[optind];
 363
 364     if (!trace_init_backends()) {
 365         exit(1);
 366     }
 367     trace_init_file();
 368
 369     /* Zero out regs */
 370     memset(regs, 0, sizeof(struct target_pt_regs));
 371
 372     /* Zero bsd params */
 373     memset(&bprm, 0, sizeof(bprm));
 374
 375     /* Zero out image_info */
 376     memset(info, 0, sizeof(struct image_info));
 377
 378     /* Scan interp_prefix dir for replacement files. */
 379     init_paths(interp_prefix);
 380
 381     if (cpu_model == NULL) {
 382         cpu_model = TARGET_DEFAULT_CPU_MODEL;
 383     }
 384
 385     cpu_type = parse_cpu_option(cpu_model);
 386
 387     /* init tcg before creating CPUs and to get qemu_host_page_size */
 388     {
 389         AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 390
 391         accel_init_interfaces(ac);
 392         ac->init_machine(NULL);
 393     }
 394     cpu = cpu_create(cpu_type);
 395     env = cpu->env_ptr;
 396     cpu_reset(cpu);
 397     thread_cpu = cpu;
 398
 399     if (getenv("QEMU_STRACE")) {
 400         do_strace = 1;
 401     }
 402
 403     target_environ = envlist_to_environ(envlist, NULL);
 404     envlist_free(envlist);
 405
 406     /*
 407      * Now that page sizes are configured we can do
 408      * proper page alignment for guest_base.
 409      */
 410     guest_base = HOST_PAGE_ALIGN(guest_base);
 411
 412     if (loader_exec(filename, argv + optind, target_environ, regs, info,
 413                     &bprm) != 0) {
 414         printf("Error loading %s\n", filename);
 415         _exit(1);
 416     }
 417
 418     for (wrk = target_environ; *wrk; wrk++) {
 419         g_free(*wrk);
 420     }
 421
 422     g_free(target_environ);
 423
 424     if (qemu_loglevel_mask(CPU_LOG_PAGE)) {
 425         qemu_log("guest_base  %p\n", (void *)guest_base);
 426         log_page_dump("binary load");
 427
 428         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 429         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 430         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
 431                  info->start_code);
 432         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
 433                  info->start_data);
 434         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 435         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
 436                  info->start_stack);
 437         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 438         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 439     }
 440
 441     /* build Task State */
 442     ts = g_new0(TaskState, 1);
 443     init_task_state(ts);
 444     ts->info = info;
 445     ts->bprm = &bprm;
 446     cpu->opaque = ts;
 447
 448     target_set_brk(info->brk);
 449     syscall_init();
 450     signal_init();
 451
 452     /*
 453      * Now that we've loaded the binary, GUEST_BASE is fixed.  Delay
 454      * generating the prologue until now so that the prologue can take
 455      * the real value of GUEST_BASE into account.
 456      */
 457     tcg_prologue_init(tcg_ctx);
 458
 459     target_cpu_init(env, regs);
 460
 461     if (gdbstub) {
 462         gdbserver_start(gdbstub);
 463         gdb_handlesig(cpu, 0);
 464     }
 465     cpu_loop(env);
 466     /* never exits */
 467     return 0;
 468 }