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