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., 51 Franklin Street - Fifth Floor, Boston,
  19  *  MA 02110-1301, USA.
  20  */
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <stdarg.h>
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <unistd.h>
  27 #include <machine/trap.h>
  28
  29 #include "qemu.h"
  30 #include "qemu-common.h"
  31 /* For tb_lock */
  32 #include "exec-all.h"
  33
  34 #define DEBUG_LOGFILE "/tmp/qemu.log"
  35
  36 static const char *interp_prefix = CONFIG_QEMU_PREFIX;
  37 const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
  38 extern char **environ;
  39
  40 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
  41    we allocate a bigger stack. Need a better solution, for example
  42    by remapping the process stack directly at the right place */
  43 unsigned long x86_stack_size = 512 * 1024;
  44
  45 void gemu_log(const char *fmt, ...)
  46 {
  47     va_list ap;
  48
  49     va_start(ap, fmt);
  50     vfprintf(stderr, fmt, ap);
  51     va_end(ap);
  52 }
  53
  54 /* These are no-ops because we are not threadsafe.  */
  55 static inline void cpu_exec_start(CPUState *env)
  56 {
  57 }
  58
  59 static inline void cpu_exec_end(CPUState *env)
  60 {
  61 }
  62
  63 static inline void start_exclusive(void)
  64 {
  65 }
  66
  67 static inline void end_exclusive(void)
  68 {
  69 }
  70
  71 void fork_start(void)
  72 {
  73 }
  74
  75 void fork_end(int child)
  76 {
  77     if (child) {
  78         gdbserver_fork(thread_env);
  79     }
  80 }
  81
  82 void cpu_list_lock(void)
  83 {
  84 }
  85
  86 void cpu_list_unlock(void)
  87 {
  88 }
  89
  90 #ifdef TARGET_SPARC
  91 #define SPARC64_STACK_BIAS 2047
  92
  93 //#define DEBUG_WIN
  94 /* WARNING: dealing with register windows _is_ complicated. More info
  95    can be found at http://www.sics.se/~psm/sparcstack.html */
  96 static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
  97 {
  98     index = (index + cwp * 16) % (16 * env->nwindows);
  99     /* wrap handling : if cwp is on the last window, then we use the
 100        registers 'after' the end */
 101     if (index < 8 && env->cwp == env->nwindows - 1)
 102         index += 16 * env->nwindows;
 103     return index;
 104 }
 105
 106 /* save the register window 'cwp1' */
 107 static inline void save_window_offset(CPUSPARCState *env, int cwp1)
 108 {
 109     unsigned int i;
 110     abi_ulong sp_ptr;
 111
 112     sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
 113 #ifdef TARGET_SPARC64
 114     if (sp_ptr & 3)
 115         sp_ptr += SPARC64_STACK_BIAS;
 116 #endif
 117 #if defined(DEBUG_WIN)
 118     printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
 119            sp_ptr, cwp1);
 120 #endif
 121     for(i = 0; i < 16; i++) {
 122         /* FIXME - what to do if put_user() fails? */
 123         put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
 124         sp_ptr += sizeof(abi_ulong);
 125     }
 126 }
 127
 128 static void save_window(CPUSPARCState *env)
 129 {
 130 #ifndef TARGET_SPARC64
 131     unsigned int new_wim;
 132     new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
 133         ((1LL << env->nwindows) - 1);
 134     save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
 135     env->wim = new_wim;
 136 #else
 137     save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
 138     env->cansave++;
 139     env->canrestore--;
 140 #endif
 141 }
 142
 143 static void restore_window(CPUSPARCState *env)
 144 {
 145 #ifndef TARGET_SPARC64
 146     unsigned int new_wim;
 147 #endif
 148     unsigned int i, cwp1;
 149     abi_ulong sp_ptr;
 150
 151 #ifndef TARGET_SPARC64
 152     new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
 153         ((1LL << env->nwindows) - 1);
 154 #endif
 155
 156     /* restore the invalid window */
 157     cwp1 = cpu_cwp_inc(env, env->cwp + 1);
 158     sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
 159 #ifdef TARGET_SPARC64
 160     if (sp_ptr & 3)
 161         sp_ptr += SPARC64_STACK_BIAS;
 162 #endif
 163 #if defined(DEBUG_WIN)
 164     printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
 165            sp_ptr, cwp1);
 166 #endif
 167     for(i = 0; i < 16; i++) {
 168         /* FIXME - what to do if get_user() fails? */
 169         get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
 170         sp_ptr += sizeof(abi_ulong);
 171     }
 172 #ifdef TARGET_SPARC64
 173     env->canrestore++;
 174     if (env->cleanwin < env->nwindows - 1)
 175         env->cleanwin++;
 176     env->cansave--;
 177 #else
 178     env->wim = new_wim;
 179 #endif
 180 }
 181
 182 static void flush_windows(CPUSPARCState *env)
 183 {
 184     int offset, cwp1;
 185
 186     offset = 1;
 187     for(;;) {
 188         /* if restore would invoke restore_window(), then we can stop */
 189         cwp1 = cpu_cwp_inc(env, env->cwp + offset);
 190 #ifndef TARGET_SPARC64
 191         if (env->wim & (1 << cwp1))
 192             break;
 193 #else
 194         if (env->canrestore == 0)
 195             break;
 196         env->cansave++;
 197         env->canrestore--;
 198 #endif
 199         save_window_offset(env, cwp1);
 200         offset++;
 201     }
 202     cwp1 = cpu_cwp_inc(env, env->cwp + 1);
 203 #ifndef TARGET_SPARC64
 204     /* set wim so that restore will reload the registers */
 205     env->wim = 1 << cwp1;
 206 #endif
 207 #if defined(DEBUG_WIN)
 208     printf("flush_windows: nb=%d\n", offset - 1);
 209 #endif
 210 }
 211
 212 void cpu_loop(CPUSPARCState *env, enum BSDType bsd_type)
 213 {
 214     int trapnr, ret, syscall_nr;
 215     //target_siginfo_t info;
 216
 217     while (1) {
 218         trapnr = cpu_sparc_exec (env);
 219
 220         switch (trapnr) {
 221 #ifndef TARGET_SPARC64
 222         case 0x80:
 223 #else
 224         case 0x100:
 225 #endif
 226             syscall_nr = env->gregs[1];
 227             if (bsd_type == target_freebsd)
 228                 ret = do_freebsd_syscall(env, syscall_nr,
 229                                          env->regwptr[0], env->regwptr[1],
 230                                          env->regwptr[2], env->regwptr[3],
 231                                          env->regwptr[4], env->regwptr[5]);
 232             else if (bsd_type == target_netbsd)
 233                 ret = do_netbsd_syscall(env, syscall_nr,
 234                                         env->regwptr[0], env->regwptr[1],
 235                                         env->regwptr[2], env->regwptr[3],
 236                                         env->regwptr[4], env->regwptr[5]);
 237             else { //if (bsd_type == target_openbsd)
 238 #if defined(TARGET_SPARC64)
 239                 syscall_nr &= ~(TARGET_OPENBSD_SYSCALL_G7RFLAG |
 240                                 TARGET_OPENBSD_SYSCALL_G2RFLAG);
 241 #endif
 242                 ret = do_openbsd_syscall(env, syscall_nr,
 243                                          env->regwptr[0], env->regwptr[1],
 244                                          env->regwptr[2], env->regwptr[3],
 245                                          env->regwptr[4], env->regwptr[5]);
 246             }
 247             if ((unsigned int)ret >= (unsigned int)(-515)) {
 248 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 249                 env->xcc |= PSR_CARRY;
 250 #else
 251                 env->psr |= PSR_CARRY;
 252 #endif
 253             } else {
 254 #if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
 255                 env->xcc &= ~PSR_CARRY;
 256 #else
 257                 env->psr &= ~PSR_CARRY;
 258 #endif
 259             }
 260             env->regwptr[0] = ret;
 261             /* next instruction */
 262 #if defined(TARGET_SPARC64)
 263             if (bsd_type == target_openbsd &&
 264                 env->gregs[1] & TARGET_OPENBSD_SYSCALL_G2RFLAG) {
 265                 env->pc = env->gregs[2];
 266                 env->npc = env->pc + 4;
 267             } else if (bsd_type == target_openbsd &&
 268                        env->gregs[1] & TARGET_OPENBSD_SYSCALL_G7RFLAG) {
 269                 env->pc = env->gregs[7];
 270                 env->npc = env->pc + 4;
 271             } else {
 272                 env->pc = env->npc;
 273                 env->npc = env->npc + 4;
 274             }
 275 #else
 276             env->pc = env->npc;
 277             env->npc = env->npc + 4;
 278 #endif
 279             break;
 280         case 0x83: /* flush windows */
 281 #ifdef TARGET_ABI32
 282         case 0x103:
 283 #endif
 284             flush_windows(env);
 285             /* next instruction */
 286             env->pc = env->npc;
 287             env->npc = env->npc + 4;
 288             break;
 289 #ifndef TARGET_SPARC64
 290         case TT_WIN_OVF: /* window overflow */
 291             save_window(env);
 292             break;
 293         case TT_WIN_UNF: /* window underflow */
 294             restore_window(env);
 295             break;
 296         case TT_TFAULT:
 297         case TT_DFAULT:
 298 #if 0
 299             {
 300                 info.si_signo = SIGSEGV;
 301                 info.si_errno = 0;
 302                 /* XXX: check env->error_code */
 303                 info.si_code = TARGET_SEGV_MAPERR;
 304                 info._sifields._sigfault._addr = env->mmuregs[4];
 305                 queue_signal(env, info.si_signo, &info);
 306             }
 307 #endif
 308             break;
 309 #else
 310         case TT_SPILL: /* window overflow */
 311             save_window(env);
 312             break;
 313         case TT_FILL: /* window underflow */
 314             restore_window(env);
 315             break;
 316         case TT_TFAULT:
 317         case TT_DFAULT:
 318 #if 0
 319             {
 320                 info.si_signo = SIGSEGV;
 321                 info.si_errno = 0;
 322                 /* XXX: check env->error_code */
 323                 info.si_code = TARGET_SEGV_MAPERR;
 324                 if (trapnr == TT_DFAULT)
 325                     info._sifields._sigfault._addr = env->dmmuregs[4];
 326                 else
 327                     info._sifields._sigfault._addr = env->tsptr->tpc;
 328                 //queue_signal(env, info.si_signo, &info);
 329             }
 330 #endif
 331             break;
 332 #endif
 333         case EXCP_INTERRUPT:
 334             /* just indicate that signals should be handled asap */
 335             break;
 336         case EXCP_DEBUG:
 337             {
 338                 int sig;
 339
 340                 sig = gdb_handlesig (env, TARGET_SIGTRAP);
 341 #if 0
 342                 if (sig)
 343                   {
 344                     info.si_signo = sig;
 345                     info.si_errno = 0;
 346                     info.si_code = TARGET_TRAP_BRKPT;
 347                     //queue_signal(env, info.si_signo, &info);
 348                   }
 349 #endif
 350             }
 351             break;
 352         default:
 353             printf ("Unhandled trap: 0x%x\n", trapnr);
 354             cpu_dump_state(env, stderr, fprintf, 0);
 355             exit (1);
 356         }
 357         process_pending_signals (env);
 358     }
 359 }
 360
 361 #endif
 362
 363 static void usage(void)
 364 {
 365     printf("qemu-" TARGET_ARCH " version " QEMU_VERSION ", Copyright (c) 2003-2008 Fabrice Bellard\n"
 366            "usage: qemu-" TARGET_ARCH " [options] program [arguments...]\n"
 367            "BSD CPU emulator (compiled for %s emulation)\n"
 368            "\n"
 369            "Standard options:\n"
 370            "-h                print this help\n"
 371            "-g port           wait gdb connection to port\n"
 372            "-L path           set the elf interpreter prefix (default=%s)\n"
 373            "-s size           set the stack size in bytes (default=%ld)\n"
 374            "-cpu model        select CPU (-cpu ? for list)\n"
 375            "-drop-ld-preload  drop LD_PRELOAD for target process\n"
 376            "-bsd type         select emulated BSD type FreeBSD/NetBSD/OpenBSD (default)\n"
 377            "\n"
 378            "Debug options:\n"
 379            "-d options   activate log (logfile=%s)\n"
 380            "-p pagesize  set the host page size to 'pagesize'\n"
 381            "-strace      log system calls\n"
 382            "\n"
 383            "Environment variables:\n"
 384            "QEMU_STRACE       Print system calls and arguments similar to the\n"
 385            "                  'strace' program.  Enable by setting to any value.\n"
 386            ,
 387            TARGET_ARCH,
 388            interp_prefix,
 389            x86_stack_size,
 390            DEBUG_LOGFILE);
 391     exit(1);
 392 }
 393
 394 THREAD CPUState *thread_env;
 395
 396 /* Assumes contents are already zeroed.  */
 397 void init_task_state(TaskState *ts)
 398 {
 399     int i;
 400
 401     ts->used = 1;
 402     ts->first_free = ts->sigqueue_table;
 403     for (i = 0; i < MAX_SIGQUEUE_SIZE - 1; i++) {
 404         ts->sigqueue_table[i].next = &ts->sigqueue_table[i + 1];
 405     }
 406     ts->sigqueue_table[i].next = NULL;
 407 }
 408
 409 int main(int argc, char **argv)
 410 {
 411     const char *filename;
 412     const char *cpu_model;
 413     struct target_pt_regs regs1, *regs = &regs1;
 414     struct image_info info1, *info = &info1;
 415     TaskState ts1, *ts = &ts1;
 416     CPUState *env;
 417     int optind;
 418     const char *r;
 419     int gdbstub_port = 0;
 420     int drop_ld_preload = 0, environ_count = 0;
 421     char **target_environ, **wrk, **dst;
 422     enum BSDType bsd_type = target_openbsd;
 423
 424     if (argc <= 1)
 425         usage();
 426
 427     /* init debug */
 428     cpu_set_log_filename(DEBUG_LOGFILE);
 429
 430     cpu_model = NULL;
 431     optind = 1;
 432     for(;;) {
 433         if (optind >= argc)
 434             break;
 435         r = argv[optind];
 436         if (r[0] != '-')
 437             break;
 438         optind++;
 439         r++;
 440         if (!strcmp(r, "-")) {
 441             break;
 442         } else if (!strcmp(r, "d")) {
 443             int mask;
 444             const CPULogItem *item;
 445
 446             if (optind >= argc)
 447                 break;
 448
 449             r = argv[optind++];
 450             mask = cpu_str_to_log_mask(r);
 451             if (!mask) {
 452                 printf("Log items (comma separated):\n");
 453                 for(item = cpu_log_items; item->mask != 0; item++) {
 454                     printf("%-10s %s\n", item->name, item->help);
 455                 }
 456                 exit(1);
 457             }
 458             cpu_set_log(mask);
 459         } else if (!strcmp(r, "s")) {
 460             r = argv[optind++];
 461             x86_stack_size = strtol(r, (char **)&r, 0);
 462             if (x86_stack_size <= 0)
 463                 usage();
 464             if (*r == 'M')
 465                 x86_stack_size *= 1024 * 1024;
 466             else if (*r == 'k' || *r == 'K')
 467                 x86_stack_size *= 1024;
 468         } else if (!strcmp(r, "L")) {
 469             interp_prefix = argv[optind++];
 470         } else if (!strcmp(r, "p")) {
 471             qemu_host_page_size = atoi(argv[optind++]);
 472             if (qemu_host_page_size == 0 ||
 473                 (qemu_host_page_size & (qemu_host_page_size - 1)) != 0) {
 474                 fprintf(stderr, "page size must be a power of two\n");
 475                 exit(1);
 476             }
 477         } else if (!strcmp(r, "g")) {
 478             gdbstub_port = atoi(argv[optind++]);
 479         } else if (!strcmp(r, "r")) {
 480             qemu_uname_release = argv[optind++];
 481         } else if (!strcmp(r, "cpu")) {
 482             cpu_model = argv[optind++];
 483             if (strcmp(cpu_model, "?") == 0) {
 484 /* XXX: implement xxx_cpu_list for targets that still miss it */
 485 #if defined(cpu_list)
 486                     cpu_list(stdout, &fprintf);
 487 #endif
 488                 exit(1);
 489             }
 490         } else if (!strcmp(r, "drop-ld-preload")) {
 491             drop_ld_preload = 1;
 492         } else if (!strcmp(r, "bsd")) {
 493             if (!strcasecmp(argv[optind], "freebsd")) {
 494                 bsd_type = target_freebsd;
 495             } else if (!strcasecmp(argv[optind], "netbsd")) {
 496                 bsd_type = target_netbsd;
 497             } else if (!strcasecmp(argv[optind], "openbsd")) {
 498                 bsd_type = target_openbsd;
 499             } else {
 500                 usage();
 501             }
 502             optind++;
 503         } else if (!strcmp(r, "strace")) {
 504             do_strace = 1;
 505         } else
 506         {
 507             usage();
 508         }
 509     }
 510     if (optind >= argc)
 511         usage();
 512     filename = argv[optind];
 513
 514     /* Zero out regs */
 515     memset(regs, 0, sizeof(struct target_pt_regs));
 516
 517     /* Zero out image_info */
 518     memset(info, 0, sizeof(struct image_info));
 519
 520     /* Scan interp_prefix dir for replacement files. */
 521     init_paths(interp_prefix);
 522
 523     if (cpu_model == NULL) {
 524 #if defined(TARGET_SPARC)
 525 #ifdef TARGET_SPARC64
 526         cpu_model = "TI UltraSparc II";
 527 #else
 528         cpu_model = "Fujitsu MB86904";
 529 #endif
 530 #else
 531         cpu_model = "any";
 532 #endif
 533     }
 534     cpu_exec_init_all(0);
 535     /* NOTE: we need to init the CPU at this stage to get
 536        qemu_host_page_size */
 537     env = cpu_init(cpu_model);
 538     if (!env) {
 539         fprintf(stderr, "Unable to find CPU definition\n");
 540         exit(1);
 541     }
 542     thread_env = env;
 543
 544     if (getenv("QEMU_STRACE")) {
 545         do_strace = 1;
 546     }
 547
 548     wrk = environ;
 549     while (*(wrk++))
 550         environ_count++;
 551
 552     target_environ = malloc((environ_count + 1) * sizeof(char *));
 553     if (!target_environ)
 554         abort();
 555     for (wrk = environ, dst = target_environ; *wrk; wrk++) {
 556         if (drop_ld_preload && !strncmp(*wrk, "LD_PRELOAD=", 11))
 557             continue;
 558         *(dst++) = strdup(*wrk);
 559     }
 560     *dst = NULL; /* NULL terminate target_environ */
 561
 562     if (loader_exec(filename, argv+optind, target_environ, regs, info) != 0) {
 563         printf("Error loading %s\n", filename);
 564         _exit(1);
 565     }
 566
 567     for (wrk = target_environ; *wrk; wrk++) {
 568         free(*wrk);
 569     }
 570
 571     free(target_environ);
 572
 573     if (qemu_log_enabled()) {
 574         log_page_dump();
 575
 576         qemu_log("start_brk   0x" TARGET_ABI_FMT_lx "\n", info->start_brk);
 577         qemu_log("end_code    0x" TARGET_ABI_FMT_lx "\n", info->end_code);
 578         qemu_log("start_code  0x" TARGET_ABI_FMT_lx "\n",
 579                  info->start_code);
 580         qemu_log("start_data  0x" TARGET_ABI_FMT_lx "\n",
 581                  info->start_data);
 582         qemu_log("end_data    0x" TARGET_ABI_FMT_lx "\n", info->end_data);
 583         qemu_log("start_stack 0x" TARGET_ABI_FMT_lx "\n",
 584                  info->start_stack);
 585         qemu_log("brk         0x" TARGET_ABI_FMT_lx "\n", info->brk);
 586         qemu_log("entry       0x" TARGET_ABI_FMT_lx "\n", info->entry);
 587     }
 588
 589     target_set_brk(info->brk);
 590     syscall_init();
 591     signal_init();
 592
 593     /* build Task State */
 594     memset(ts, 0, sizeof(TaskState));
 595     init_task_state(ts);
 596     ts->info = info;
 597     env->opaque = ts;
 598
 599 #if defined(TARGET_SPARC)
 600     {
 601         int i;
 602         env->pc = regs->pc;
 603         env->npc = regs->npc;
 604         env->y = regs->y;
 605         for(i = 0; i < 8; i++)
 606             env->gregs[i] = regs->u_regs[i];
 607         for(i = 0; i < 8; i++)
 608             env->regwptr[i] = regs->u_regs[i + 8];
 609     }
 610 #else
 611 #error unsupported target CPU
 612 #endif
 613
 614     if (gdbstub_port) {
 615         gdbserver_start (gdbstub_port);
 616         gdb_handlesig(env, 0);
 617     }
 618     cpu_loop(env, bsd_type);
 619     /* never exits */
 620     return 0;
 621 }