bsd-user/main.c

   1 /*
   2  *  qemu user main
   3  *
   4  *  Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 #include <stdlib.h>
  21 #include <stdio.h>
  22 #include <stdarg.h>
  23 #include <string.h>
  24 #include <errno.h>
  25 #include <unistd.h>
  26 #include <machine/trap.h>
  27
  28 #include "qemu.h"
  29 #include "qemu-common.h"
  30 /* For tb_lock */
  31 #include "exec-all.h"
  32
  33 #define DEBUG_LOGFILE "/tmp/qemu.log"
  34
  35 static const char *interp_prefix = CONFIG_QEMU_PREFIX;
  36 const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
  37 extern char **environ;
  38
  39 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
  40    we allocate a bigger stack. Need a better solution, for example
  41    by remapping the process stack directly at the right place */
  42 unsigned long x86_stack_size = 512 * 1024;
  43
  44 void gemu_log(const char *fmt, ...)
  45 {
  46     va_list ap;
  47
  48     va_start(ap, fmt);
  49     vfprintf(stderr, fmt, ap);
  50     va_end(ap);
  51 }
  52 #ifdef TARGET_SPARC
  53 #define SPARC64_STACK_BIAS 2047
  54
  55 //#define DEBUG_WIN
  56 /* WARNING: dealing with register windows _is_ complicated. More info
  57    can be found at http://www.sics.se/~psm/sparcstack.html */
  58 static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
  59 {
  60     index = (index + cwp * 16) % (16 * env->nwindows);
  61     /* wrap handling : if cwp is on the last window, then we use the
  62        registers 'after' the end */
  63     if (index < 8 && env->cwp == env->nwindows - 1)
  64         index += 16 * env->nwindows;
  65     return index;
  66 }
  67
  68 /* save the register window 'cwp1' */
  69 static inline void save_window_offset(CPUSPARCState *env, int cwp1)
  70 {
  71     unsigned int i;
  72     abi_ulong sp_ptr;
  73
  74     sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
  75 #ifdef TARGET_SPARC64
  76     if (sp_ptr & 3)
  77         sp_ptr += SPARC64_STACK_BIAS;
  78 #endif
  79 #if defined(DEBUG_WIN)
  80     printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
  81            sp_ptr, cwp1);
  82 #endif
  83     for(i = 0; i < 16; i++) {
  84         /* FIXME - what to do if put_user() fails? */
  85         put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
  86         sp_ptr += sizeof(abi_ulong);
  87     }
  88 }
  89
  90 static void save_window(CPUSPARCState *env)
  91 {
  92 #ifndef TARGET_SPARC64
  93     unsigned int new_wim;
  94     new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
  95         ((1LL << env->nwindows) - 1);
  96     save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
  97     env->wim = new_wim;
  98 #else
  99     save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
 100     env->cansave++;
 101     env->canrestore--;
 102 #endif
 103 }
 104
 105 static void restore_window(CPUSPARCState *env)
 106 {
 107 #ifndef TARGET_SPARC64
 108     unsigned int new_wim;
 109 #endif
 110     unsigned int i, cwp1;
 111     abi_ulong sp_ptr;
 112
 113 #ifndef TARGET_SPARC64
 114     new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
 115         ((1LL << env->nwindows) - 1);
 116 #endif
 117
 118     /* restore the invalid window */
 119     cwp1 = cpu_cwp_inc(env, env->cwp + 1);
 120     sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
 121 #ifdef TARGET_SPARC64
 122     if (sp_ptr & 3)
 123         sp_ptr += SPARC64_STACK_BIAS;
 124 #endif
 125 #if defined(DEBUG_WIN)
 126     printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
 127            sp_ptr, cwp1);
 128 #endif
 129     for(i = 0; i < 16; i++) {
 130         /* FIXME - what to do if get_user() fails? */
 131         get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
 132         sp_ptr += sizeof(abi_ulong);
 133     }
 134 #ifdef TARGET_SPARC64
 135     env->canrestore++;
 136     if (env->cleanwin < env->nwindows - 1)
 137         env->cleanwin++;
 138     env->cansave--;
 139 #else
 140     env->wim = new_wim;
 141 #endif
 142 }
 143
 144 static void flush_windows(CPUSPARCState *env)
 145 {
 146     int offset, cwp1;
 147
 148     offset = 1;
 149     for(;;) {
 150         /* if restore would invoke restore_window(), then we can stop */
 151         cwp1 = cpu_cwp_inc(env, env->cwp + offset);
 152 #ifndef TARGET_SPARC64
 153         if (env->wim & (1 << cwp1))
 154             break;
 155 #else
 156         if (env->canrestore == 0)
 157             break;
 158         env->cansave++;
 159         env->canrestore--;
 160 #endif
 161         save_window_offset(env, cwp1);
 162         offset++;
 163     }
 164     cwp1 = cpu_cwp_inc(env, env->cwp + 1);
 165 #ifndef TARGET_SPARC64
 166     /* set wim so that restore will reload the registers */
 167     env->wim = 1 << cwp1;
 168 #endif
 169 #if defined(DEBUG_WIN)
 170     printf("flush_windows: nb=%d\n", offset - 1);
 171 #endif
 172 }
 173
 174 void cpu_loop(CPUSPARCState *env, enum BSDType bsd_type)
 175 {
 176     int trapnr, ret, syscall_nr;
 177     //target_siginfo_t info;
 178
 179     while (1) {
 180         trapnr = cpu_sparc_exec (env);
 181
 182         switch (trapnr) {
 183         case 0x100:
 184             syscall_nr = env->gregs[1];
 185 #if defined(TARGET_SPARC)
 186             syscall_nr &= ~(SYSCALL_G7RFLAG | SYSCALL_G2RFLAG);
 187 #endif
 188             if (bsd_type == target_freebsd)
 189                 ret = do_freebsd_syscall(env, syscall_nr,
 190                                          env->regwptr[0], env->regwptr[1],
 191                                          env->regwptr[2], env->regwptr[3],
 192                                          env->regwptr[4], env->regwptr[5]);
 193             else if (bsd_type == target_netbsd)
 194                 ret = do_netbsd_syscall(env, syscall_nr,
 195                                         env->regwptr[0], env->regwptr[1],
 196                                         env->regwptr[2], env->regwptr[3],
 197                                         env->regwptr[4], env->regwptr[5]);
 198             else //if (bsd_type == target_openbsd)
 199                 ret = do_openbsd_syscall(env, syscall_nr,
 200                                          env->regwptr[0], env->regwptr[1],
 201                                          env->regwptr[2], env->regwptr[3],
 202                                          env->regwptr[4], env->regwptr[5]);
 203             if ((unsigned int)ret >= (unsigned int)(-515)) {
 204 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 205                 env->xcc |= PSR_CARRY;
 206 #else
 207                 env->psr |= PSR_CARRY;
 208 #endif
 209             } else {
 210 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 211                 env->xcc &= ~PSR_CARRY;
 212 #else
 213                 env->psr &= ~PSR_CARRY;
 214 #endif
 215             }
 216             env->regwptr[0] = ret;
 217             /* next instruction */
 218 #if defined(TARGET_SPARC)
 219             if (env->gregs[1] & SYSCALL_G2RFLAG) {
 220                 env->pc = env->gregs[2];
 221                 env->npc = env->pc + 4;
 222             } else if (env->gregs[1] & SYSCALL_G7RFLAG) {
 223                 env->pc = env->gregs[7];
 224                 env->npc = env->pc + 4;
 225             } else {
 226                 env->pc = env->npc;
 227                 env->npc = env->npc + 4;
 228             }
 229 #else
 230             env->pc = env->npc;
 231             env->npc = env->npc + 4;
 232 #endif
 233             break;
 234         case 0x83: /* flush windows */
 235 #ifdef TARGET_ABI32
 236         case 0x103:
 237 #endif
 238             flush_windows(env);
 239             /* next instruction */
 240             env->pc = env->npc;
 241             env->npc = env->npc + 4;
 242             break;
 243 #ifndef TARGET_SPARC64
 244         case TT_WIN_OVF: /* window overflow */
 245             save_window(env);
 246             break;
 247         case TT_WIN_UNF: /* window underflow */
 248             restore_window(env);
 249             break;
 250         case TT_TFAULT:
 251         case TT_DFAULT:
 252 #if 0
 253             {
 254                 info.si_signo = SIGSEGV;
 255                 info.si_errno = 0;
 256                 /* XXX: check env->error_code */
 257                 info.si_code = TARGET_SEGV_MAPERR;
 258                 info._sifields._sigfault._addr = env->mmuregs[4];
 259                 queue_signal(env, info.si_signo, &info);
 260             }
 261 #endif
 262             break;
 263 #else
 264         case TT_SPILL: /* window overflow */
 265             save_window(env);
 266             break;
 267         case TT_FILL: /* window underflow */
 268             restore_window(env);
 269             break;
 270         case TT_TFAULT:
 271         case TT_DFAULT:
 272 #if 0
 273             {
 274                 info.si_signo = SIGSEGV;
 275                 info.si_errno = 0;
 276                 /* XXX: check env->error_code */
 277                 info.si_code = TARGET_SEGV_MAPERR;
 278                 if (trapnr == TT_DFAULT)
 279                     info._sifields._sigfault._addr = env->dmmuregs[4];
 280                 else
 281                     info._sifields._sigfault._addr = env->tsptr->tpc;
 282                 //queue_signal(env, info.si_signo, &info);
 283             }
 284 #endif
 285             break;
 286 #endif
 287         case EXCP_INTERRUPT:
 288             /* just indicate that signals should be handled asap */
 289             break;
 290         case EXCP_DEBUG:
 291             {
 292                 int sig;
 293
 294                 sig = gdb_handlesig (env, TARGET_SIGTRAP);
 295 #if 0
 296                 if (sig)
 297                   {
 298                     info.si_signo = sig;
 299                     info.si_errno = 0;
 300                     info.si_code = TARGET_TRAP_BRKPT;
 301                     //queue_signal(env, info.si_signo, &info);
 302                   }
 303 #endif
 304             }
 305             break;
 306         default:
 307             printf ("Unhandled trap: 0x%x\n", trapnr);
 308             cpu_dump_state(env, stderr, fprintf, 0);
 309             exit (1);
 310         }
 311         process_pending_signals (env);
 312     }
 313 }
 314
 315 #endif
 316
 317 static void usage(void)
 318 {
 319     printf("qemu-" TARGET_ARCH " version " QEMU_VERSION ", Copyright (c) 2003-2008 Fabrice Bellard\n"
 320            "usage: qemu-" TARGET_ARCH " [options] program [arguments...]\n"
 321            "BSD CPU emulator (compiled for %s emulation)\n"
 322            "\n"
 323            "Standard options:\n"
 324            "-h                print this help\n"
 325            "-g port           wait gdb connection to port\n"
 326            "-L path           set the elf interpreter prefix (default=%s)\n"
 327            "-s size           set the stack size in bytes (default=%ld)\n"
 328            "-cpu model        select CPU (-cpu ? for list)\n"
 329            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
 330            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
 331            "\n"
 332            "Debug options:\n"
 333            "-d options   activate log (logfile=%s)\n"
 334            "-p pagesize  set the host page size to 'pagesize'\n"
 335            "-strace      log system calls\n"
 336            "\n"
 337            "Environment variables:\n"
 338            "QEMU_STRACE       Print system calls and arguments similar to the\n"
 339            "                  'strace' program.  Enable by setting to any value.\n"
 340            ,
 341            TARGET_ARCH,
 342            interp_prefix,
 343            x86_stack_size,
 344            DEBUG_LOGFILE);
 345     _exit(1);
 346 }
 347
 348 THREAD CPUState *thread_env;
 349
 350 /* Assumes contents are already zeroed.  */
 351 void init_task_state(TaskState *ts)
 352 {
 353     int i;
 354
 355     ts->used = 1;
 356     ts->first_free = ts->sigqueue_table;
 357     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
 358         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
 359     }
 360     ts->sigqueue_table[i].next = NULL;
 361 }
 362
 363 int main(int argc, char **argv)
 364 {
 365     const char *filename;
 366     const char *cpu_model;
 367     struct target_pt_regs regs1, *regs = &regs1;
 368     struct image_info info1, *info = &info1;
 369     TaskState ts1, *ts = &ts1;
 370     CPUState *env;
 371     int optind;
 372     const char *r;
 373     int gdbstub_port = 0;
 374     int drop_ld_preload = 0, environ_count = 0;
 375     char **target_environ, **wrk, **dst;
 376     enum BSDType bsd_type = target_openbsd;
 377
 378     if (argc <= 1)
 379         usage();
 380
 381     /* init debug */
 382     cpu_set_log_filename(DEBUG_LOGFILE);
 383
 384     cpu_model = NULL;
 385     optind = 1;
 386     for(;;) {
 387         if (optind >= argc)
 388             break;
 389         r = argv[optind];
 390         if (r[0] != '-')
 391             break;
 392         optind++;
 393         r++;
 394         if (!strcmp(r, "-")) {
 395             break;
 396         } else if (!strcmp(r, "d")) {
 397             int mask;
 398             const CPULogItem *item;
 399
 400             if (optind >= argc)
 401                 break;
 402
 403             r = argv[optind++];
 404             mask = cpu_str_to_log_mask(r);
 405             if (!mask) {
 406                 printf("Log items (comma separated):\n");
 407                 for(item = cpu_log_items; item->mask != 0; item++) {
 408                     printf("%-10s %s\n", item->name, item->help);
 409                 }
 410                 exit(1);
 411             }
 412             cpu_set_log(mask);
 413         } else if (!strcmp(r, "s")) {
 414             r = argv[optind++];
 415             x86_stack_size = strtol(r, (char **)&r, 0);
 416             if (x86_stack_size <= 0)
 417                 usage();
 418             if (*r == 'M')
 419                 x86_stack_size *= 1024 * 1024;
 420             else if (*r == 'k' || *r == 'K')
 421                 x86_stack_size *= 1024;
 422         } else if (!strcmp(r, "L")) {
 423             interp_prefix = argv[optind++];
 424         } else if (!strcmp(r, "p")) {
 425             qemu_host_page_size = atoi(argv[optind++]);
 426             if (qemu_host_page_size == 0 ||
 427                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 428                 fprintf(stderr, "page size must be a power of two\n");
 429                 exit(1);
 430             }
 431         } else if (!strcmp(r, "g")) {
 432             gdbstub_port = atoi(argv[optind++]);
 433         } else if (!strcmp(r, "r")) {
 434             qemu_uname_release = argv[optind++];
 435         } else if (!strcmp(r, "cpu")) {
 436             cpu_model = argv[optind++];
 437             if (strcmp(cpu_model, "?") == 0) {
 438 /* XXX: implement xxx_cpu_list for targets that still miss it */
 439 #if defined(cpu_list)
 440                     cpu_list(stdout, &fprintf);
 441 #endif
 442                 _exit(1);
 443             }
 444         } else if (!strcmp(r, "drop-ld-preload")) {
 445             drop_ld_preload = 1;
 446         } else if (!strcmp(r, "bsd")) {
 447             if (!strcasecmp(argv[optind], "freebsd")) {
 448                 bsd_type = target_freebsd;
 449             } else if (!strcasecmp(argv[optind], "netbsd")) {
 450                 bsd_type = target_netbsd;
 451             } else if (!strcasecmp(argv[optind], "openbsd")) {
 452                 bsd_type = target_openbsd;
 453             } else {
 454                 usage();
 455             }
 456             optind++;
 457         } else if (!strcmp(r, "strace")) {
 458             do_strace = 1;
 459         } else
 460         {
 461             usage();
 462         }
 463     }
 464     if (optind >= argc)
 465         usage();
 466     filename = argv[optind];
 467
 468     /* Zero out regs */
 469     memset(regs, 0, sizeof(struct target_pt_regs));
 470
 471     /* Zero out image_info */
 472     memset(info, 0, sizeof(struct image_info));
 473
 474     /* Scan interp_prefix dir for replacement files. */
 475     init_paths(interp_prefix);
 476
 477     if (cpu_model == NULL) {
 478 #if defined(TARGET_SPARC)
 479 #ifdef TARGET_SPARC64
 480         cpu_model = "TI UltraSparc II";
 481 #else
 482         cpu_model = "Fujitsu MB86904";
 483 #endif
 484 #else
 485         cpu_model = "any";
 486 #endif
 487     }
 488     cpu_exec_init_all(0);
 489     /* NOTE: we need to init the CPU at this stage to get
 490        qemu_host_page_size */
 491     env = cpu_init(cpu_model);
 492     if (!env) {
 493         fprintf(stderr, "Unable to find CPU definition\n");
 494         exit(1);
 495     }
 496     thread_env = env;
 497
 498     if (getenv("QEMU_STRACE")) {
 499         do_strace = 1;
 500     }
 501
 502     wrk = environ;
 503     while (*(wrk++))
 504         environ_count++;
 505
 506     target_environ = malloc((environ_count + 1) * sizeof(char *));
 507     if (!target_environ)
 508         abort();
 509     for (wrk = environ, dst = target_environ; *wrk; wrk++) {
 510         if (drop_ld_preload && !strncmp(*wrk, "LD_PRELOAD=", 11))
 511             continue;
 512         *(dst++) = strdup(*wrk);
 513     }
 514     *dst = NULL; /* NULL terminate target_environ */
 515
 516     if (loader_exec(filename, argv+optind, target_environ, regs, info) != 0) {
 517         printf("Error loading %s\n", filename);
 518         _exit(1);
 519     }
 520
 521     for (wrk = target_environ; *wrk; wrk++) {
 522         free(*wrk);
 523     }
 524
 525     free(target_environ);
 526
 527     if (loglevel) {
 528         page_dump(logfile);
 529
 530         fprintf(logfile, "start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 531         fprintf(logfile, "end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 532         fprintf(logfile, "start_code  0x" TARGET_ABI_FMT_lx "\n",
 533                 info->start_code);
 534         fprintf(logfile, "start_data  0x" TARGET_ABI_FMT_lx "\n",
 535                 info->start_data);
 536         fprintf(logfile, "end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 537         fprintf(logfile, "start_stack 0x" TARGET_ABI_FMT_lx "\n",
 538                 info->start_stack);
 539         fprintf(logfile, "brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 540         fprintf(logfile, "entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 541     }
 542
 543     target_set_brk(info->brk);
 544     syscall_init();
 545     signal_init();
 546
 547     /* build Task State */
 548     memset(ts, 0, sizeof(TaskState));
 549     init_task_state(ts);
 550     ts->info = info;
 551     env->opaque = ts;
 552     env->user_mode_only = 1;
 553
 554 #if defined(TARGET_SPARC)
 555     {
 556         int i;
 557         env->pc = regs->pc;
 558         env->npc = regs->npc;
 559         env->y = regs->y;
 560         for(i = 0; i < 8; i++)
 561             env->gregs[i] = regs->u_regs[i];
 562         for(i = 0; i < 8; i++)
 563             env->regwptr[i] = regs->u_regs[i + 8];
 564     }
 565 #else
 566 #error unsupported target CPU
 567 #endif
 568
 569     if (gdbstub_port) {
 570         gdbserver_start (gdbstub_port);
 571         gdb_handlesig(env, 0);
 572     }
 573     cpu_loop(env, bsd_type);
 574     /* never exits */
 575     return 0;
 576 }