monitor.c

   1 /*
   2  * QEMU monitor
   3  *
   4  * Copyright (c) 2003-2004 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "vl.h"
  25 #include "disas.h"
  26
  27 //#define DEBUG
  28
  29 #ifndef offsetof
  30 #define offsetof(type, field) ((size_t) &((type *)0)->field)
  31 #endif
  32
  33 #define TERM_CMD_BUF_SIZE 4095
  34 #define TERM_MAX_CMDS 64
  35
  36 #define IS_NORM 0
  37 #define IS_ESC  1
  38 #define IS_CSI  2
  39
  40 #define printf do_not_use_printf
  41
  42 static char term_cmd_buf[TERM_CMD_BUF_SIZE + 1];
  43 static int term_cmd_buf_index;
  44 static int term_cmd_buf_size;
  45 static int term_esc_state;
  46 static int term_esc_param;
  47
  48 static char *term_history[TERM_MAX_CMDS];
  49 static int term_hist_entry;
  50
  51 /*
  52  * Supported types:
  53  *
  54  * 'F'          filename
  55  * 's'          string (accept optional quote)
  56  * 'i'          integer
  57  * '/'          optional gdb-like print format (like "/10x")
  58  *
  59  * '?'          optional type (for 'F', 's' and 'i')
  60  *
  61  */
  62
  63 typedef struct term_cmd_t {
  64     const char *name;
  65     const char *args_type;
  66     void (*handler)();
  67     const char *params;
  68     const char *help;
  69 } term_cmd_t;
  70
  71 static term_cmd_t term_cmds[];
  72 static term_cmd_t info_cmds[];
  73
  74 void term_printf(const char *fmt, ...)
  75 {
  76     va_list ap;
  77     va_start(ap, fmt);
  78     vprintf(fmt, ap);
  79     va_end(ap);
  80 }
  81
  82 void term_flush(void)
  83 {
  84     fflush(stdout);
  85 }
  86
  87 static int compare_cmd(const char *name, const char *list)
  88 {
  89     const char *p, *pstart;
  90     int len;
  91     len = strlen(name);
  92     p = list;
  93     for(;;) {
  94         pstart = p;
  95         p = strchr(p, '|');
  96         if (!p)
  97             p = pstart + strlen(pstart);
  98         if ((p - pstart) == len && !memcmp(pstart, name, len))
  99             return 1;
 100         if (*p == '\0')
 101             break;
 102         p++;
 103     }
 104     return 0;
 105 }
 106
 107 static void help_cmd1(term_cmd_t *cmds, const char *prefix, const char *name)
 108 {
 109     term_cmd_t *cmd;
 110
 111     for(cmd = cmds; cmd->name != NULL; cmd++) {
 112         if (!name || !strcmp(name, cmd->name))
 113             term_printf("%s%s %s -- %s\n", prefix, cmd->name, cmd->params, cmd->help);
 114     }
 115 }
 116
 117 static void help_cmd(const char *name)
 118 {
 119     if (name && !strcmp(name, "info")) {
 120         help_cmd1(info_cmds, "info ", NULL);
 121     } else {
 122         help_cmd1(term_cmds, "", name);
 123         if (name && !strcmp(name, "log")) {
 124             CPULogItem *item;
 125             term_printf("Log items (comma separated):\n");
 126             term_printf("%-10s %s\n", "none", "remove all logs");
 127             for(item = cpu_log_items; item->mask != 0; item++) {
 128                 term_printf("%-10s %s\n", item->name, item->help);
 129             }
 130         }
 131     }
 132 }
 133
 134 static void do_help(const char *name)
 135 {
 136     help_cmd(name);
 137 }
 138
 139 static void do_commit(void)
 140 {
 141     int i;
 142
 143     for (i = 0; i < MAX_DISKS; i++) {
 144         if (bs_table[i])
 145             bdrv_commit(bs_table[i]);
 146     }
 147 }
 148
 149 static void do_info(const char *item)
 150 {
 151     term_cmd_t *cmd;
 152
 153     if (!item)
 154         goto help;
 155     for(cmd = info_cmds; cmd->name != NULL; cmd++) {
 156         if (compare_cmd(item, cmd->name))
 157             goto found;
 158     }
 159  help:
 160     help_cmd("info");
 161     return;
 162  found:
 163     cmd->handler();
 164 }
 165
 166 static void do_info_network(void)
 167 {
 168     int i, j;
 169     NetDriverState *nd;
 170
 171     for(i = 0; i < nb_nics; i++) {
 172         nd = &nd_table[i];
 173         term_printf("%d: ifname=%s macaddr=", i, nd->ifname);
 174         for(j = 0; j < 6; j++) {
 175             if (j > 0)
 176                 term_printf(":");
 177             term_printf("%02x", nd->macaddr[j]);
 178         }
 179         term_printf("\n");
 180     }
 181 }
 182
 183 static void do_info_block(void)
 184 {
 185     bdrv_info();
 186 }
 187
 188 static void do_info_registers(void)
 189 {
 190 #ifdef TARGET_I386
 191     cpu_dump_state(cpu_single_env, stdout, X86_DUMP_FPU | X86_DUMP_CCOP);
 192 #else
 193     cpu_dump_state(cpu_single_env, stdout, 0);
 194 #endif
 195 }
 196
 197 static void do_info_history (void)
 198 {
 199     int i;
 200
 201     for (i = 0; i < TERM_MAX_CMDS; i++) {
 202         if (term_history[i] == NULL)
 203             break;
 204         term_printf("%d: '%s'\n", i, term_history[i]);
 205     }
 206 }
 207
 208 static void do_quit(void)
 209 {
 210     exit(0);
 211 }
 212
 213 static int eject_device(BlockDriverState *bs, int force)
 214 {
 215     if (bdrv_is_inserted(bs)) {
 216         if (!force) {
 217             if (!bdrv_is_removable(bs)) {
 218                 term_printf("device is not removable\n");
 219                 return -1;
 220             }
 221             if (bdrv_is_locked(bs)) {
 222                 term_printf("device is locked\n");
 223                 return -1;
 224             }
 225         }
 226         bdrv_close(bs);
 227     }
 228     return 0;
 229 }
 230
 231 static void do_eject(int force, const char *filename)
 232 {
 233     BlockDriverState *bs;
 234
 235     term_printf("%d %s\n", force, filename);
 236
 237     bs = bdrv_find(filename);
 238     if (!bs) {
 239         term_printf("device not found\n");
 240         return;
 241     }
 242     eject_device(bs, force);
 243 }
 244
 245 static void do_change(const char *device, const char *filename)
 246 {
 247     BlockDriverState *bs;
 248
 249     bs = bdrv_find(device);
 250     if (!bs) {
 251         term_printf("device not found\n");
 252         return;
 253     }
 254     if (eject_device(bs, 0) < 0)
 255         return;
 256     bdrv_open(bs, filename, 0);
 257 }
 258
 259 static void do_screen_dump(const char *filename)
 260 {
 261     vga_screen_dump(filename);
 262 }
 263
 264 static void do_log(const char *items)
 265 {
 266     int mask;
 267
 268     if (!strcmp(items, "none")) {
 269         mask = 0;
 270     } else {
 271         mask = cpu_str_to_log_mask(items);
 272         if (!mask) {
 273             help_cmd("log");
 274             return;
 275         }
 276     }
 277     cpu_set_log(mask);
 278 }
 279
 280 static void do_savevm(const char *filename)
 281 {
 282     if (qemu_savevm(filename) < 0)
 283         term_printf("I/O error when saving VM to '%s'\n", filename);
 284 }
 285
 286 static void do_loadvm(const char *filename)
 287 {
 288     if (qemu_loadvm(filename) < 0)
 289         term_printf("I/O error when loading VM from '%s'\n", filename);
 290 }
 291
 292 static void do_stop(void)
 293 {
 294     vm_stop(EXCP_INTERRUPT);
 295 }
 296
 297 static void do_cont(void)
 298 {
 299     vm_start();
 300 }
 301
 302 #ifdef CONFIG_GDBSTUB
 303 static void do_gdbserver(int has_port, int port)
 304 {
 305     if (!has_port)
 306         port = DEFAULT_GDBSTUB_PORT;
 307     if (gdbserver_start(port) < 0) {
 308         qemu_printf("Could not open gdbserver socket on port %d\n", port);
 309     } else {
 310         qemu_printf("Waiting gdb connection on port %d\n", port);
 311     }
 312 }
 313 #endif
 314
 315 static void term_printc(int c)
 316 {
 317     term_printf("'");
 318     switch(c) {
 319     case '\'':
 320         term_printf("\\'");
 321         break;
 322     case '\\':
 323         term_printf("\\\\");
 324         break;
 325     case '\n':
 326         term_printf("\\n");
 327         break;
 328     case '\r':
 329         term_printf("\\r");
 330         break;
 331     default:
 332         if (c >= 32 && c <= 126) {
 333             term_printf("%c", c);
 334         } else {
 335             term_printf("\\x%02x", c);
 336         }
 337         break;
 338     }
 339     term_printf("'");
 340 }
 341
 342 static void memory_dump(int count, int format, int wsize,
 343                         target_ulong addr, int is_physical)
 344 {
 345     int nb_per_line, l, line_size, i, max_digits, len;
 346     uint8_t buf[16];
 347     uint64_t v;
 348
 349     if (format == 'i') {
 350         int flags;
 351         flags = 0;
 352 #ifdef TARGET_I386
 353         if (wsize == 2) {
 354             flags = 1;
 355         } else if (wsize == 4) {
 356             flags = 0;
 357         } else {
 358             /* as default we use the current CS size */
 359             flags = 0;
 360             if (!(cpu_single_env->segs[R_CS].flags & DESC_B_MASK))
 361                 flags = 1;
 362         }
 363 #endif
 364         monitor_disas(addr, count, is_physical, flags);
 365         return;
 366     }
 367
 368     len = wsize * count;
 369     if (wsize == 1)
 370         line_size = 8;
 371     else
 372         line_size = 16;
 373     nb_per_line = line_size / wsize;
 374     max_digits = 0;
 375
 376     switch(format) {
 377     case 'o':
 378         max_digits = (wsize * 8 + 2) / 3;
 379         break;
 380     default:
 381     case 'x':
 382         max_digits = (wsize * 8) / 4;
 383         break;
 384     case 'u':
 385     case 'd':
 386         max_digits = (wsize * 8 * 10 + 32) / 33;
 387         break;
 388     case 'c':
 389         wsize = 1;
 390         break;
 391     }
 392
 393     while (len > 0) {
 394         term_printf("0x%08x:", addr);
 395         l = len;
 396         if (l > line_size)
 397             l = line_size;
 398         if (is_physical) {
 399             cpu_physical_memory_rw(addr, buf, l, 0);
 400         } else {
 401             cpu_memory_rw_debug(cpu_single_env, addr, buf, l, 0);
 402         }
 403         i = 0;
 404         while (i < l) {
 405             switch(wsize) {
 406             default:
 407             case 1:
 408                 v = ldub_raw(buf + i);
 409                 break;
 410             case 2:
 411                 v = lduw_raw(buf + i);
 412                 break;
 413             case 4:
 414                 v = ldl_raw(buf + i);
 415                 break;
 416             case 8:
 417                 v = ldq_raw(buf + i);
 418                 break;
 419             }
 420             term_printf(" ");
 421             switch(format) {
 422             case 'o':
 423                 term_printf("%#*llo", max_digits, v);
 424                 break;
 425             case 'x':
 426                 term_printf("0x%0*llx", max_digits, v);
 427                 break;
 428             case 'u':
 429                 term_printf("%*llu", max_digits, v);
 430                 break;
 431             case 'd':
 432                 term_printf("%*lld", max_digits, v);
 433                 break;
 434             case 'c':
 435                 term_printc(v);
 436                 break;
 437             }
 438             i += wsize;
 439         }
 440         term_printf("\n");
 441         addr += l;
 442         len -= l;
 443     }
 444 }
 445
 446 static void do_memory_dump(int count, int format, int size, int addr)
 447 {
 448     memory_dump(count, format, size, addr, 0);
 449 }
 450
 451 static void do_physical_memory_dump(int count, int format, int size, int addr)
 452 {
 453     memory_dump(count, format, size, addr, 1);
 454 }
 455
 456 static void do_print(int count, int format, int size, int val)
 457 {
 458     switch(format) {
 459     case 'o':
 460         term_printf("%#o", val);
 461         break;
 462     case 'x':
 463         term_printf("%#x", val);
 464         break;
 465     case 'u':
 466         term_printf("%u", val);
 467         break;
 468     default:
 469     case 'd':
 470         term_printf("%d", val);
 471         break;
 472     case 'c':
 473         term_printc(val);
 474         break;
 475     }
 476     term_printf("\n");
 477 }
 478
 479 static term_cmd_t term_cmds[] = {
 480     { "help|?", "s?", do_help,
 481       "[cmd]", "show the help" },
 482     { "commit", "", do_commit,
 483       "", "commit changes to the disk images (if -snapshot is used)" },
 484     { "info", "s?", do_info,
 485       "subcommand", "show various information about the system state" },
 486     { "q|quit", "", do_quit,
 487       "", "quit the emulator" },
 488     { "eject", "-fs", do_eject,
 489       "[-f] device", "eject a removable media (use -f to force it)" },
 490     { "change", "sF", do_change,
 491       "device filename", "change a removable media" },
 492     { "screendump", "F", do_screen_dump,
 493       "filename", "save screen into PPM image 'filename'" },
 494     { "log", "s", do_log,
 495       "item1[,...]", "activate logging of the specified items to '/tmp/qemu.log'" },
 496     { "savevm", "F", do_savevm,
 497       "filename", "save the whole virtual machine state to 'filename'" },
 498     { "loadvm", "F", do_loadvm,
 499       "filename", "restore the whole virtual machine state from 'filename'" },
 500     { "stop", "", do_stop,
 501       "", "stop emulation", },
 502     { "c|cont", "", do_cont,
 503       "", "resume emulation", },
 504 #ifdef CONFIG_GDBSTUB
 505     { "gdbserver", "i?", do_gdbserver,
 506       "[port]", "start gdbserver session (default port=1234)", },
 507 #endif
 508     { "x", "/i", do_memory_dump,
 509       "/fmt addr", "virtual memory dump starting at 'addr'", },
 510     { "xp", "/i", do_physical_memory_dump,
 511       "/fmt addr", "physical memory dump starting at 'addr'", },
 512     { "p|print", "/i", do_print,
 513       "/fmt expr", "print expression value (use $reg for CPU register access)", },
 514     { NULL, NULL, },
 515 };
 516
 517 static term_cmd_t info_cmds[] = {
 518     { "network", "", do_info_network,
 519       "", "show the network state" },
 520     { "block", "", do_info_block,
 521       "", "show the block devices" },
 522     { "registers", "", do_info_registers,
 523       "", "show the cpu registers" },
 524     { "history", "", do_info_history,
 525       "", "show the command line history", },
 526     { "pic", "", pic_info,
 527       "", "show i8259 (PIC) state", },
 528     { "pci", "", pci_info,
 529       "", "show PCI info", },
 530     { NULL, NULL, },
 531 };
 532
 533 /*******************************************************************/
 534
 535 static const char *pch;
 536 static jmp_buf expr_env;
 537
 538 typedef struct MonitorDef {
 539     const char *name;
 540     int offset;
 541     int (*get_value)(struct MonitorDef *md);
 542 } MonitorDef;
 543
 544 #if defined(TARGET_I386)
 545 static int monitor_get_pc (struct MonitorDef *md)
 546 {
 547     return cpu_single_env->eip + (long)cpu_single_env->segs[R_CS].base;
 548 }
 549 #endif
 550
 551 #if defined(TARGET_PPC)
 552 static int monitor_get_ccr (struct MonitorDef *md)
 553 {
 554     unsigned int u;
 555     int i;
 556
 557     u = 0;
 558     for (i = 0; i < 8; i++)
 559         u |= cpu_single_env->crf[i] << (32 - (4 * i));
 560
 561     return u;
 562 }
 563
 564 static int monitor_get_msr (struct MonitorDef *md)
 565 {
 566     return (cpu_single_env->msr[MSR_POW] << MSR_POW) |
 567         (cpu_single_env->msr[MSR_ILE] << MSR_ILE) |
 568         (cpu_single_env->msr[MSR_EE] << MSR_EE) |
 569         (cpu_single_env->msr[MSR_PR] << MSR_PR) |
 570         (cpu_single_env->msr[MSR_FP] << MSR_FP) |
 571         (cpu_single_env->msr[MSR_ME] << MSR_ME) |
 572         (cpu_single_env->msr[MSR_FE0] << MSR_FE0) |
 573         (cpu_single_env->msr[MSR_SE] << MSR_SE) |
 574         (cpu_single_env->msr[MSR_BE] << MSR_BE) |
 575         (cpu_single_env->msr[MSR_FE1] << MSR_FE1) |
 576         (cpu_single_env->msr[MSR_IP] << MSR_IP) |
 577         (cpu_single_env->msr[MSR_IR] << MSR_IR) |
 578         (cpu_single_env->msr[MSR_DR] << MSR_DR) |
 579         (cpu_single_env->msr[MSR_RI] << MSR_RI) |
 580         (cpu_single_env->msr[MSR_LE] << MSR_LE);
 581 }
 582
 583 static int monitor_get_xer (struct MonitorDef *md)
 584 {
 585     return (cpu_single_env->xer[XER_SO] << XER_SO) |
 586         (cpu_single_env->xer[XER_OV] << XER_OV) |
 587         (cpu_single_env->xer[XER_CA] << XER_CA) |
 588         (cpu_single_env->xer[XER_BC] << XER_BC);
 589 }
 590 #endif
 591
 592 static MonitorDef monitor_defs[] = {
 593 #ifdef TARGET_I386
 594
 595 #define SEG(name, seg) \
 596     { name, offsetof(CPUState, segs[seg].selector) },\
 597     { name ".base", offsetof(CPUState, segs[seg].base) },\
 598     { name ".limit", offsetof(CPUState, segs[seg].limit) },
 599
 600     { "eax", offsetof(CPUState, regs[0]) },
 601     { "ecx", offsetof(CPUState, regs[1]) },
 602     { "edx", offsetof(CPUState, regs[2]) },
 603     { "ebx", offsetof(CPUState, regs[3]) },
 604     { "esp|sp", offsetof(CPUState, regs[4]) },
 605     { "ebp|fp", offsetof(CPUState, regs[5]) },
 606     { "esi", offsetof(CPUState, regs[6]) },
 607     { "esi", offsetof(CPUState, regs[7]) },
 608     { "eflags", offsetof(CPUState, eflags) },
 609     { "eip", offsetof(CPUState, eip) },
 610     SEG("cs", R_CS)
 611     SEG("ds", R_DS)
 612     SEG("es", R_ES)
 613     SEG("fs", R_FS)
 614     SEG("gs", R_GS)
 615     { "pc", 0, monitor_get_pc, },
 616 #elif defined(TARGET_PPC)
 617     { "r0", offsetof(CPUState, gpr[0]) },
 618     { "r1", offsetof(CPUState, gpr[1]) },
 619     { "r2", offsetof(CPUState, gpr[2]) },
 620     { "r3", offsetof(CPUState, gpr[3]) },
 621     { "r4", offsetof(CPUState, gpr[4]) },
 622     { "r5", offsetof(CPUState, gpr[5]) },
 623     { "r6", offsetof(CPUState, gpr[6]) },
 624     { "r7", offsetof(CPUState, gpr[7]) },
 625     { "r8", offsetof(CPUState, gpr[8]) },
 626     { "r9", offsetof(CPUState, gpr[9]) },
 627     { "r10", offsetof(CPUState, gpr[10]) },
 628     { "r11", offsetof(CPUState, gpr[11]) },
 629     { "r12", offsetof(CPUState, gpr[12]) },
 630     { "r13", offsetof(CPUState, gpr[13]) },
 631     { "r14", offsetof(CPUState, gpr[14]) },
 632     { "r15", offsetof(CPUState, gpr[15]) },
 633     { "r16", offsetof(CPUState, gpr[16]) },
 634     { "r17", offsetof(CPUState, gpr[17]) },
 635     { "r18", offsetof(CPUState, gpr[18]) },
 636     { "r19", offsetof(CPUState, gpr[19]) },
 637     { "r20", offsetof(CPUState, gpr[20]) },
 638     { "r21", offsetof(CPUState, gpr[21]) },
 639     { "r22", offsetof(CPUState, gpr[22]) },
 640     { "r23", offsetof(CPUState, gpr[23]) },
 641     { "r24", offsetof(CPUState, gpr[24]) },
 642     { "r25", offsetof(CPUState, gpr[25]) },
 643     { "r26", offsetof(CPUState, gpr[26]) },
 644     { "r27", offsetof(CPUState, gpr[27]) },
 645     { "r28", offsetof(CPUState, gpr[28]) },
 646     { "r29", offsetof(CPUState, gpr[29]) },
 647     { "r30", offsetof(CPUState, gpr[30]) },
 648     { "r31", offsetof(CPUState, gpr[31]) },
 649     { "nip|pc", offsetof(CPUState, nip) },
 650     { "lr", offsetof(CPUState, lr) },
 651     { "ctr", offsetof(CPUState, ctr) },
 652     { "decr", offsetof(CPUState, decr) },
 653     { "ccr", 0, &monitor_get_ccr, },
 654     { "msr", 0, &monitor_get_msr, },
 655     { "xer", 0, &monitor_get_xer, },
 656     { "tbu", offsetof(CPUState, tb[0]) },
 657     { "tbl", offsetof(CPUState, tb[1]) },
 658     { "sdr1", offsetof(CPUState, sdr1) },
 659     { "sr0", offsetof(CPUState, sr[0]) },
 660     { "sr1", offsetof(CPUState, sr[1]) },
 661     { "sr2", offsetof(CPUState, sr[2]) },
 662     { "sr3", offsetof(CPUState, sr[3]) },
 663     { "sr4", offsetof(CPUState, sr[4]) },
 664     { "sr5", offsetof(CPUState, sr[5]) },
 665     { "sr6", offsetof(CPUState, sr[6]) },
 666     { "sr7", offsetof(CPUState, sr[7]) },
 667     { "sr8", offsetof(CPUState, sr[8]) },
 668     { "sr9", offsetof(CPUState, sr[9]) },
 669     { "sr10", offsetof(CPUState, sr[10]) },
 670     { "sr11", offsetof(CPUState, sr[11]) },
 671     { "sr12", offsetof(CPUState, sr[12]) },
 672     { "sr13", offsetof(CPUState, sr[13]) },
 673     { "sr14", offsetof(CPUState, sr[14]) },
 674     { "sr15", offsetof(CPUState, sr[15]) },
 675     /* Too lazy to put BATs and SPRs ... */
 676 #endif
 677     { NULL },
 678 };
 679
 680 static void expr_error(const char *fmt)
 681 {
 682     term_printf(fmt);
 683     term_printf("\n");
 684     longjmp(expr_env, 1);
 685 }
 686
 687 static int get_monitor_def(int *pval, const char *name)
 688 {
 689     MonitorDef *md;
 690     for(md = monitor_defs; md->name != NULL; md++) {
 691         if (compare_cmd(name, md->name)) {
 692             if (md->get_value) {
 693                 *pval = md->get_value(md);
 694             } else {
 695                 *pval = *(uint32_t *)((uint8_t *)cpu_single_env + md->offset);
 696             }
 697             return 0;
 698         }
 699     }
 700     return -1;
 701 }
 702
 703 static void next(void)
 704 {
 705     if (pch != '\0') {
 706         pch++;
 707         while (isspace(*pch))
 708             pch++;
 709     }
 710 }
 711
 712 static int expr_sum(void);
 713
 714 static int expr_unary(void)
 715 {
 716     int n;
 717     char *p;
 718
 719     switch(*pch) {
 720     case '+':
 721         next();
 722         n = expr_unary();
 723         break;
 724     case '-':
 725         next();
 726         n = -expr_unary();
 727         break;
 728     case '~':
 729         next();
 730         n = ~expr_unary();
 731         break;
 732     case '(':
 733         next();
 734         n = expr_sum();
 735         if (*pch != ')') {
 736             expr_error("')' expected");
 737         }
 738         next();
 739         break;
 740     case '$':
 741         {
 742             char buf[128], *q;
 743
 744             pch++;
 745             q = buf;
 746             while ((*pch >= 'a' && *pch <= 'z') ||
 747                    (*pch >= 'A' && *pch <= 'Z') ||
 748                    (*pch >= '0' && *pch <= '9') ||
 749                    *pch == '_' || *pch == '.') {
 750                 if ((q - buf) < sizeof(buf) - 1)
 751                     *q++ = *pch;
 752                 pch++;
 753             }
 754             while (isspace(*pch))
 755                 pch++;
 756             *q = 0;
 757             if (get_monitor_def(&n, buf))
 758                 expr_error("unknown register");
 759         }
 760         break;
 761     case '\0':
 762         expr_error("unexpected end of expression");
 763         n = 0;
 764         break;
 765     default:
 766         n = strtoul(pch, &p, 0);
 767         if (pch == p) {
 768             expr_error("invalid char in expression");
 769         }
 770         pch = p;
 771         while (isspace(*pch))
 772             pch++;
 773         break;
 774     }
 775     return n;
 776 }
 777
 778
 779 static int expr_prod(void)
 780 {
 781     int val, val2, op;
 782
 783     val = expr_unary();
 784     for(;;) {
 785         op = *pch;
 786         if (op != '*' && op != '/' && op != '%')
 787             break;
 788         next();
 789         val2 = expr_unary();
 790         switch(op) {
 791         default:
 792         case '*':
 793             val *= val2;
 794             break;
 795         case '/':
 796         case '%':
 797             if (val2 == 0)
 798                 expr_error("divison by zero");
 799             if (op == '/')
 800                 val /= val2;
 801             else
 802                 val %= val2;
 803             break;
 804         }
 805     }
 806     return val;
 807 }
 808
 809 static int expr_logic(void)
 810 {
 811     int val, val2, op;
 812
 813     val = expr_prod();
 814     for(;;) {
 815         op = *pch;
 816         if (op != '&' && op != '|' && op != '^')
 817             break;
 818         next();
 819         val2 = expr_prod();
 820         switch(op) {
 821         default:
 822         case '&':
 823             val &= val2;
 824             break;
 825         case '|':
 826             val |= val2;
 827             break;
 828         case '^':
 829             val ^= val2;
 830             break;
 831         }
 832     }
 833     return val;
 834 }
 835
 836 static int expr_sum(void)
 837 {
 838     int val, val2, op;
 839
 840     val = expr_logic();
 841     for(;;) {
 842         op = *pch;
 843         if (op != '+' && op != '-')
 844             break;
 845         next();
 846         val2 = expr_logic();
 847         if (op == '+')
 848             val += val2;
 849         else
 850             val -= val2;
 851     }
 852     return val;
 853 }
 854
 855 static int get_expr(int *pval, const char **pp)
 856 {
 857     pch = *pp;
 858     if (setjmp(expr_env)) {
 859         *pp = pch;
 860         return -1;
 861     }
 862     while (isspace(*pch))
 863         pch++;
 864     *pval = expr_sum();
 865     *pp = pch;
 866     return 0;
 867 }
 868
 869 static int get_str(char *buf, int buf_size, const char **pp)
 870 {
 871     const char *p;
 872     char *q;
 873     int c;
 874
 875     p = *pp;
 876     while (isspace(*p))
 877         p++;
 878     if (*p == '\0') {
 879     fail:
 880         *pp = p;
 881         return -1;
 882     }
 883     q = buf;
 884     if (*p == '\"') {
 885         p++;
 886         while (*p != '\0' && *p != '\"') {
 887             if (*p == '\\') {
 888                 p++;
 889                 c = *p++;
 890                 switch(c) {
 891                 case 'n':
 892                     c = '\n';
 893                     break;
 894                 case 'r':
 895                     c = '\r';
 896                     break;
 897                 case '\\':
 898                 case '\'':
 899                 case '\"':
 900                     break;
 901                 default:
 902                     qemu_printf("unsupported escape code: '\\%c'\n", c);
 903                     goto fail;
 904                 }
 905                 if ((q - buf) < buf_size - 1) {
 906                     *q++ = c;
 907                 }
 908             } else {
 909                 if ((q - buf) < buf_size - 1) {
 910                     *q++ = *p;
 911                 }
 912                 p++;
 913             }
 914         }
 915         if (*p != '\"') {
 916             qemu_printf("untermintated string\n");
 917             goto fail;
 918         }
 919         p++;
 920     } else {
 921         while (*p != '\0' && !isspace(*p)) {
 922             if ((q - buf) < buf_size - 1) {
 923                 *q++ = *p;
 924             }
 925             p++;
 926         }
 927         *q = '\0';
 928     }
 929     *pp = p;
 930     return 0;
 931 }
 932
 933 static int default_fmt_format = 'x';
 934 static int default_fmt_size = 4;
 935
 936 #define MAX_ARGS 16
 937
 938 static void term_handle_command(const char *cmdline)
 939 {
 940     const char *p, *pstart, *typestr;
 941     char *q;
 942     int c, nb_args, len, i, has_arg;
 943     term_cmd_t *cmd;
 944     char cmdname[256];
 945     char buf[1024];
 946     void *str_allocated[MAX_ARGS];
 947     void *args[MAX_ARGS];
 948
 949 #ifdef DEBUG
 950     term_printf("command='%s'\n", cmdline);
 951 #endif
 952
 953     /* extract the command name */
 954     p = cmdline;
 955     q = cmdname;
 956     while (isspace(*p))
 957         p++;
 958     if (*p == '\0')
 959         return;
 960     pstart = p;
 961     while (*p != '\0' && *p != '/' && !isspace(*p))
 962         p++;
 963     len = p - pstart;
 964     if (len > sizeof(cmdname) - 1)
 965         len = sizeof(cmdname) - 1;
 966     memcpy(cmdname, pstart, len);
 967     cmdname[len] = '\0';
 968
 969     /* find the command */
 970     for(cmd = term_cmds; cmd->name != NULL; cmd++) {
 971         if (compare_cmd(cmdname, cmd->name))
 972             goto found;
 973     }
 974     term_printf("unknown command: '%s'\n", cmdname);
 975     return;
 976  found:
 977
 978     for(i = 0; i < MAX_ARGS; i++)
 979         str_allocated[i] = NULL;
 980
 981     /* parse the parameters */
 982     typestr = cmd->args_type;
 983     nb_args = 0;
 984     for(;;) {
 985         c = *typestr;
 986         if (c == '\0')
 987             break;
 988         typestr++;
 989         switch(c) {
 990         case 'F':
 991         case 's':
 992             {
 993                 int ret;
 994                 char *str;
 995
 996                 while (isspace(*p))
 997                     p++;
 998                 if (*typestr == '?') {
 999                     typestr++;
1000                     if (*p == '\0') {
1001                         /* no optional string: NULL argument */
1002                         str = NULL;
1003                         goto add_str;
1004                     }
1005                 }
1006                 ret = get_str(buf, sizeof(buf), &p);
1007                 if (ret < 0) {
1008                     if (c == 'F')
1009                         term_printf("%s: filename expected\n", cmdname);
1010                     else
1011                         term_printf("%s: string expected\n", cmdname);
1012                     goto fail;
1013                 }
1014                 str = qemu_malloc(strlen(buf) + 1);
1015                 strcpy(str, buf);
1016                 str_allocated[nb_args] = str;
1017             add_str:
1018                 if (nb_args >= MAX_ARGS) {
1019                 error_args:
1020                     term_printf("%s: too many arguments\n", cmdname);
1021                     goto fail;
1022                 }
1023                 args[nb_args++] = str;
1024             }
1025             break;
1026         case '/':
1027             {
1028                 int count, format, size;
1029
1030                 while (isspace(*p))
1031                     p++;
1032                 if (*p == '/') {
1033                     /* format found */
1034                     p++;
1035                     count = 1;
1036                     if (isdigit(*p)) {
1037                         count = 0;
1038                         while (isdigit(*p)) {
1039                             count = count * 10 + (*p - '0');
1040                             p++;
1041                         }
1042                     }
1043                     size = -1;
1044                     format = -1;
1045                     for(;;) {
1046                         switch(*p) {
1047                         case 'o':
1048                         case 'd':
1049                         case 'u':
1050                         case 'x':
1051                         case 'i':
1052                         case 'c':
1053                             format = *p++;
1054                             break;
1055                         case 'b':
1056                             size = 1;
1057                             p++;
1058                             break;
1059                         case 'h':
1060                             size = 2;
1061                             p++;
1062                             break;
1063                         case 'w':
1064                             size = 4;
1065                             p++;
1066                             break;
1067                         case 'g':
1068                         case 'L':
1069                             size = 8;
1070                             p++;
1071                             break;
1072                         default:
1073                             goto next;
1074                         }
1075                     }
1076                 next:
1077                     if (*p != '\0' && !isspace(*p)) {
1078                         term_printf("invalid char in format: '%c'\n", *p);
1079                         goto fail;
1080                     }
1081                     if (format < 0)
1082                         format = default_fmt_format;
1083                     if (format != 'i') {
1084                         /* for 'i', not specifying a size gives -1 as size */
1085                         if (size < 0)
1086                             size = default_fmt_size;
1087                     }
1088                     default_fmt_size = size;
1089                     default_fmt_format = format;
1090                 } else {
1091                     count = 1;
1092                     format = default_fmt_format;
1093                     if (format != 'i') {
1094                         size = default_fmt_size;
1095                     } else {
1096                         size = -1;
1097                     }
1098                 }
1099                 if (nb_args + 3 > MAX_ARGS)
1100                     goto error_args;
1101                 args[nb_args++] = (void*)count;
1102                 args[nb_args++] = (void*)format;
1103                 args[nb_args++] = (void*)size;
1104             }
1105             break;
1106         case 'i':
1107             {
1108                 int val;
1109                 while (isspace(*p))
1110                     p++;
1111                 if (*typestr == '?') {
1112                     typestr++;
1113                     if (*p == '\0')
1114                         has_arg = 0;
1115                     else
1116                         has_arg = 1;
1117                     if (nb_args >= MAX_ARGS)
1118                         goto error_args;
1119                     args[nb_args++] = (void *)has_arg;
1120                     if (!has_arg) {
1121                         if (nb_args >= MAX_ARGS)
1122                             goto error_args;
1123                         val = -1;
1124                         goto add_num;
1125                     }
1126                 }
1127                 if (get_expr(&val, &p))
1128                     goto fail;
1129             add_num:
1130                 if (nb_args >= MAX_ARGS)
1131                     goto error_args;
1132                 args[nb_args++] = (void *)val;
1133             }
1134             break;
1135         case '-':
1136             {
1137                 int has_option;
1138                 /* option */
1139
1140                 c = *typestr++;
1141                 if (c == '\0')
1142                     goto bad_type;
1143                 while (isspace(*p))
1144                     p++;
1145                 has_option = 0;
1146                 if (*p == '-') {
1147                     p++;
1148                     if (*p != c) {
1149                         term_printf("%s: unsupported option -%c\n",
1150                                     cmdname, *p);
1151                         goto fail;
1152                     }
1153                     p++;
1154                     has_option = 1;
1155                 }
1156                 if (nb_args >= MAX_ARGS)
1157                     goto error_args;
1158                 args[nb_args++] = (void *)has_option;
1159             }
1160             break;
1161         default:
1162         bad_type:
1163             term_printf("%s: unknown type '%c'\n", cmdname, c);
1164             goto fail;
1165         }
1166     }
1167     /* check that all arguments were parsed */
1168     while (isspace(*p))
1169         p++;
1170     if (*p != '\0') {
1171         term_printf("%s: extraneous characters at the end of line\n",
1172                     cmdname);
1173         goto fail;
1174     }
1175
1176     switch(nb_args) {
1177     case 0:
1178         cmd->handler();
1179         break;
1180     case 1:
1181         cmd->handler(args[0]);
1182         break;
1183     case 2:
1184         cmd->handler(args[0], args[1]);
1185         break;
1186     case 3:
1187         cmd->handler(args[0], args[1], args[2]);
1188         break;
1189     case 4:
1190         cmd->handler(args[0], args[1], args[2], args[3]);
1191         break;
1192     case 5:
1193         cmd->handler(args[0], args[1], args[2], args[3], args[4]);
1194         break;
1195     default:
1196         term_printf("unsupported number of arguments: %d\n", nb_args);
1197         goto fail;
1198     }
1199  fail:
1200     for(i = 0; i < MAX_ARGS; i++)
1201         qemu_free(str_allocated[i]);
1202     return;
1203 }
1204
1205 static void term_show_prompt(void)
1206 {
1207     term_printf("(qemu) ");
1208     fflush(stdout);
1209     term_cmd_buf_index = 0;
1210     term_cmd_buf_size = 0;
1211     term_esc_state = IS_NORM;
1212 }
1213
1214 static void term_print_cmdline (const char *cmdline)
1215 {
1216     term_show_prompt();
1217     term_printf(cmdline);
1218     term_flush();
1219 }
1220
1221 static void term_insert_char(int ch)
1222 {
1223     if (term_cmd_buf_index < TERM_CMD_BUF_SIZE) {
1224         memmove(term_cmd_buf + term_cmd_buf_index + 1,
1225                 term_cmd_buf + term_cmd_buf_index,
1226                 term_cmd_buf_size - term_cmd_buf_index);
1227         term_cmd_buf[term_cmd_buf_index] = ch;
1228         term_cmd_buf_size++;
1229         term_printf("\033[@%c", ch);
1230         term_cmd_buf_index++;
1231         term_flush();
1232     }
1233 }
1234
1235 static void term_backward_char(void)
1236 {
1237     if (term_cmd_buf_index > 0) {
1238         term_cmd_buf_index--;
1239         term_printf("\033[D");
1240         term_flush();
1241     }
1242 }
1243
1244 static void term_forward_char(void)
1245 {
1246     if (term_cmd_buf_index < term_cmd_buf_size) {
1247         term_cmd_buf_index++;
1248         term_printf("\033[C");
1249         term_flush();
1250     }
1251 }
1252
1253 static void term_delete_char(void)
1254 {
1255     if (term_cmd_buf_index < term_cmd_buf_size) {
1256         memmove(term_cmd_buf + term_cmd_buf_index,
1257                 term_cmd_buf + term_cmd_buf_index + 1,
1258                 term_cmd_buf_size - term_cmd_buf_index - 1);
1259         term_printf("\033[P");
1260         term_cmd_buf_size--;
1261         term_flush();
1262     }
1263 }
1264
1265 static void term_backspace(void)
1266 {
1267     if (term_cmd_buf_index > 0) {
1268         term_backward_char();
1269         term_delete_char();
1270     }
1271 }
1272
1273 static void term_bol(void)
1274 {
1275     while (term_cmd_buf_index > 0)
1276         term_backward_char();
1277 }
1278
1279 static void term_eol(void)
1280 {
1281     while (term_cmd_buf_index < term_cmd_buf_size)
1282         term_forward_char();
1283 }
1284
1285 static void term_up_char(void)
1286 {
1287     int idx;
1288
1289     if (term_hist_entry == 0)
1290         return;
1291     if (term_hist_entry == -1) {
1292         /* Find latest entry */
1293         for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
1294             if (term_history[idx] == NULL)
1295                 break;
1296         }
1297         term_hist_entry = idx;
1298     }
1299     term_hist_entry--;
1300     if (term_hist_entry >= 0) {
1301         strcpy(term_cmd_buf, term_history[term_hist_entry]);
1302         term_printf("\n");
1303         term_print_cmdline(term_cmd_buf);
1304         term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
1305     }
1306 }
1307
1308 static void term_down_char(void)
1309 {
1310     if (term_hist_entry == TERM_MAX_CMDS - 1 || term_hist_entry == -1)
1311         return;
1312     if (term_history[++term_hist_entry] != NULL) {
1313         strcpy(term_cmd_buf, term_history[term_hist_entry]);
1314     } else {
1315         term_hist_entry = -1;
1316     }
1317     term_printf("\n");
1318     term_print_cmdline(term_cmd_buf);
1319     term_cmd_buf_index = term_cmd_buf_size = strlen(term_cmd_buf);
1320 }
1321
1322 static void term_hist_add(const char *cmdline)
1323 {
1324     char *hist_entry, *new_entry;
1325     int idx;
1326
1327     if (cmdline[0] == '\0')
1328         return;
1329     new_entry = NULL;
1330     if (term_hist_entry != -1) {
1331         /* We were editing an existing history entry: replace it */
1332         hist_entry = term_history[term_hist_entry];
1333         idx = term_hist_entry;
1334         if (strcmp(hist_entry, cmdline) == 0) {
1335             goto same_entry;
1336         }
1337     }
1338     /* Search cmdline in history buffers */
1339     for (idx = 0; idx < TERM_MAX_CMDS; idx++) {
1340         hist_entry = term_history[idx];
1341         if (hist_entry == NULL)
1342             break;
1343         if (strcmp(hist_entry, cmdline) == 0) {
1344         same_entry:
1345             new_entry = hist_entry;
1346             /* Put this entry at the end of history */
1347             memmove(&term_history[idx], &term_history[idx + 1],
1348                     &term_history[TERM_MAX_CMDS] - &term_history[idx + 1]);
1349             term_history[TERM_MAX_CMDS - 1] = NULL;
1350             for (; idx < TERM_MAX_CMDS; idx++) {
1351                 if (term_history[idx] == NULL)
1352                     break;
1353             }
1354             break;
1355         }
1356     }
1357     if (idx == TERM_MAX_CMDS) {
1358         /* Need to get one free slot */
1359         free(term_history[0]);
1360         memcpy(term_history, &term_history[1],
1361                &term_history[TERM_MAX_CMDS] - &term_history[1]);
1362         term_history[TERM_MAX_CMDS - 1] = NULL;
1363         idx = TERM_MAX_CMDS - 1;
1364     }
1365     if (new_entry == NULL)
1366         new_entry = strdup(cmdline);
1367     term_history[idx] = new_entry;
1368     term_hist_entry = -1;
1369 }
1370
1371 /* return true if command handled */
1372 static void term_handle_byte(int ch)
1373 {
1374     switch(term_esc_state) {
1375     case IS_NORM:
1376         switch(ch) {
1377         case 1:
1378             term_bol();
1379             break;
1380         case 5:
1381             term_eol();
1382             break;
1383         case 10:
1384         case 13:
1385             term_cmd_buf[term_cmd_buf_size] = '\0';
1386             term_hist_add(term_cmd_buf);
1387             term_printf("\n");
1388             term_handle_command(term_cmd_buf);
1389             term_show_prompt();
1390             break;
1391         case 27:
1392             term_esc_state = IS_ESC;
1393             break;
1394         case 127:
1395         case 8:
1396             term_backspace();
1397             break;
1398         case 155:
1399             term_esc_state = IS_CSI;
1400             break;
1401         default:
1402             if (ch >= 32) {
1403                 term_insert_char(ch);
1404             }
1405             break;
1406         }
1407         break;
1408     case IS_ESC:
1409         if (ch == '[') {
1410             term_esc_state = IS_CSI;
1411             term_esc_param = 0;
1412         } else {
1413             term_esc_state = IS_NORM;
1414         }
1415         break;
1416     case IS_CSI:
1417         switch(ch) {
1418         case 'A':
1419         case 'F':
1420             term_up_char();
1421             break;
1422         case 'B':
1423         case 'E':
1424             term_down_char();
1425             break;
1426         case 'D':
1427             term_backward_char();
1428             break;
1429         case 'C':
1430             term_forward_char();
1431             break;
1432         case '0' ... '9':
1433             term_esc_param = term_esc_param * 10 + (ch - '0');
1434             goto the_end;
1435         case '~':
1436             switch(term_esc_param) {
1437             case 1:
1438                 term_bol();
1439                 break;
1440             case 3:
1441                 term_delete_char();
1442                 break;
1443             case 4:
1444                 term_eol();
1445                 break;
1446             }
1447             break;
1448         default:
1449             break;
1450         }
1451         term_esc_state = IS_NORM;
1452     the_end:
1453         break;
1454     }
1455 }
1456
1457 /*************************************************************/
1458 /* serial console support */
1459
1460 #define TERM_ESCAPE 0x01 /* ctrl-a is used for escape */
1461
1462 static int term_got_escape, term_command;
1463
1464 void term_print_help(void)
1465 {
1466     term_printf("\n"
1467                 "C-a h    print this help\n"
1468                 "C-a x    exit emulatior\n"
1469                 "C-a s    save disk data back to file (if -snapshot)\n"
1470                 "C-a b    send break (magic sysrq)\n"
1471                 "C-a c    switch between console and monitor\n"
1472                 "C-a C-a  send C-a\n"
1473                 );
1474 }
1475
1476 /* called when a char is received */
1477 static void term_received_byte(int ch)
1478 {
1479     if (!serial_console) {
1480         /* if no serial console, handle every command */
1481         term_handle_byte(ch);
1482     } else {
1483         if (term_got_escape) {
1484             term_got_escape = 0;
1485             switch(ch) {
1486             case 'h':
1487                 term_print_help();
1488                 break;
1489             case 'x':
1490                 exit(0);
1491                 break;
1492             case 's':
1493                 {
1494                     int i;
1495                     for (i = 0; i < MAX_DISKS; i++) {
1496                         if (bs_table[i])
1497                             bdrv_commit(bs_table[i]);
1498                     }
1499                 }
1500                 break;
1501             case 'b':
1502                 if (serial_console)
1503                     serial_receive_break(serial_console);
1504                 break;
1505             case 'c':
1506                 if (!term_command) {
1507                     term_show_prompt();
1508                     term_command = 1;
1509                 } else {
1510                     term_command = 0;
1511                 }
1512                 break;
1513             case TERM_ESCAPE:
1514                 goto send_char;
1515             }
1516         } else if (ch == TERM_ESCAPE) {
1517             term_got_escape = 1;
1518         } else {
1519         send_char:
1520             if (term_command) {
1521                 term_handle_byte(ch);
1522             } else {
1523                 if (serial_console)
1524                     serial_receive_byte(serial_console, ch);
1525             }
1526         }
1527     }
1528 }
1529
1530 static int term_can_read(void *opaque)
1531 {
1532     if (serial_console) {
1533         return serial_can_receive(serial_console);
1534     } else {
1535         return 128;
1536     }
1537 }
1538
1539 static void term_read(void *opaque, const uint8_t *buf, int size)
1540 {
1541     int i;
1542     for(i = 0; i < size; i++)
1543         term_received_byte(buf[i]);
1544 }
1545
1546 void monitor_init(void)
1547 {
1548     if (!serial_console) {
1549         term_printf("QEMU %s monitor - type 'help' for more information\n",
1550                     QEMU_VERSION);
1551         term_show_prompt();
1552     }
1553     term_hist_entry = -1;
1554     qemu_add_fd_read_handler(0, term_can_read, term_read, NULL);
1555 }