osfmk/ddb/db_command.c

   1 /*
   2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52 /*
  53  *      Author: David B. Golub, Carnegie Mellon University
  54  *      Date:   7/90
  55  */
  56
  57 /*
  58  * Command dispatcher.
  59  */
  60 #include <norma_vm.h>
  61 #ifdef  AT386
  62 #include <norma_scsi.h>
  63 #endif  /* AT386 */
  64
  65 #include <mach/boolean.h>
  66 #include <string.h>
  67 #include <machine/db_machdep.h>
  68
  69 #if defined(__alpha)
  70 #  include <kdebug.h>
  71 #  if KDEBUG
  72 #    include <machine/kdebug.h>
  73 #  endif
  74 #endif /* defined(__alpha) */
  75
  76 #include <ddb/db_lex.h>
  77 #include <ddb/db_output.h>
  78 #include <ddb/db_break.h>
  79 #include <ddb/db_command.h>
  80 #include <ddb/db_cond.h>
  81 #include <ddb/db_examine.h>
  82 #include <ddb/db_expr.h>
  83 #include <ppc/db_low_trace.h>
  84 #include <ddb/db_macro.h>
  85 #include <ddb/db_print.h>
  86 #include <ddb/db_run.h>
  87 #include <ddb/db_task_thread.h>
  88 #include <ddb/db_variables.h>
  89 #include <ddb/db_watch.h>
  90 #include <ddb/db_write_cmd.h>
  91 #include <ddb/tr.h>
  92
  93 #include <machine/setjmp.h>
  94 #include <kern/thread.h>
  95
  96 #include <kern/misc_protos.h>
  97 #include <vm/vm_print.h>
  98 #include <ipc/ipc_print.h>
  99 #include <kern/kern_print.h>
 100 #include <machine/db_machdep.h>         /* For db_stack_trace_cmd(). */
 101 #include <kern/zalloc.h>        /* For db_show_one_zone, db_show_all_zones. */
 102 #include <kern/lock.h>                  /* For db_show_all_slocks(). */
 103
 104 #if     NORMA_VM
 105 #include <xmm/xmm_obj.h>
 106 #endif  /* NORMA_VM */
 107
 108 /*
 109  * Exported global variables
 110  */
 111 boolean_t       db_cmd_loop_done;
 112 jmp_buf_t       *db_recover = 0;
 113 db_addr_t       db_dot;
 114 db_addr_t       db_last_addr;
 115 db_addr_t       db_prev;
 116 db_addr_t       db_next;
 117
 118 /*
 119  * if 'ed' style: 'dot' is set at start of last item printed,
 120  * and '+' points to next line.
 121  * Otherwise: 'dot' points to next item, '..' points to last.
 122  */
 123 boolean_t       db_ed_style = TRUE;
 124
 125 /*
 126  * Results of command search.
 127  */
 128 #define CMD_UNIQUE      0
 129 #define CMD_FOUND       1
 130 #define CMD_NONE        2
 131 #define CMD_AMBIGUOUS   3
 132 #define CMD_HELP        4
 133
 134 /* Prototypes for functions local to this file.  XXX -- should be static!
 135  */
 136
 137 void db_command(
 138         struct db_command       **last_cmdp,    /* IN_OUT */
 139         db_expr_t               *last_countp,   /* IN_OUT */
 140         char                    *last_modifp,   /* IN_OUT */
 141         struct db_command       *cmd_table);
 142
 143 void db_help_cmd(void);
 144
 145 void db_output_prompt(void);
 146
 147 void db_fncall(void);
 148
 149 void db_cmd_list(struct db_command *table);
 150
 151 int db_cmd_search(
 152         char *                  name,
 153         struct db_command *     table,
 154         struct db_command **    cmdp);  /* out */
 155
 156 void db_command_list(
 157         struct db_command       **last_cmdp,    /* IN_OUT */
 158         db_expr_t               *last_countp,   /* IN_OUT */
 159         char                    *last_modifp,   /* IN_OUT */
 160         struct db_command       *cmd_table);
 161
 162
 163
 164 /*
 165  * Search for command prefix.
 166  */
 167 int
 168 db_cmd_search(
 169         char *                  name,
 170         struct db_command *     table,
 171         struct db_command **    cmdp)   /* out */
 172 {
 173         struct db_command       *cmd;
 174         int             result = CMD_NONE;
 175
 176         for (cmd = table; cmd->name != 0; cmd++) {
 177             register char *lp;
 178             register char *rp;
 179             register int  c;
 180
 181             lp = name;
 182             rp = cmd->name;
 183             while ((c = *lp) == *rp) {
 184                 if (c == 0) {
 185                     /* complete match */
 186                     *cmdp = cmd;
 187                     return (CMD_UNIQUE);
 188                 }
 189                 lp++;
 190                 rp++;
 191             }
 192             if (c == 0) {
 193                 /* end of name, not end of command -
 194                    partial match */
 195                 if (result == CMD_FOUND) {
 196                     result = CMD_AMBIGUOUS;
 197                     /* but keep looking for a full match -
 198                        this lets us match single letters */
 199                 }
 200                 else {
 201                     *cmdp = cmd;
 202                     result = CMD_FOUND;
 203                 }
 204             }
 205         }
 206         if (result == CMD_NONE) {
 207             /* check for 'help' */
 208             if (!strncmp(name, "help", strlen(name)))
 209                 result = CMD_HELP;
 210         }
 211         return (result);
 212 }
 213
 214 void
 215 db_cmd_list(struct db_command *table)
 216 {
 217         register struct db_command *new;
 218         register struct db_command *old;
 219         register struct db_command *cur;
 220         unsigned int l;
 221         unsigned int len;
 222
 223         len = 1;
 224         for (cur = table; cur->name != 0; cur++)
 225             if ((l = strlen(cur->name)) >= len)
 226                 len = l + 1;
 227
 228         old = (struct db_command *)0;
 229         for (;;) {
 230             new = (struct db_command *)0;
 231             for (cur = table; cur->name != 0; cur++)
 232                 if ((new == (struct db_command *)0 ||
 233                      strcmp(cur->name, new->name) < 0) &&
 234                     (old == (struct db_command *)0 ||
 235                      strcmp(cur->name, old->name) > 0))
 236                     new = cur;
 237             if (new == (struct db_command *)0)
 238                     return;
 239             db_reserve_output_position(len);
 240             db_printf("%-*s", len, new->name);
 241             old = new;
 242         }
 243 }
 244
 245 void
 246 db_command(
 247         struct db_command       **last_cmdp,    /* IN_OUT */
 248         db_expr_t               *last_countp,   /* IN_OUT */
 249         char                    *last_modifp,   /* IN_OUT */
 250         struct db_command       *cmd_table)
 251 {
 252         struct db_command       *cmd;
 253         int             t;
 254         char            modif[TOK_STRING_SIZE];
 255         char            *modifp = &modif[0];
 256         db_expr_t       addr, count;
 257         boolean_t       have_addr;
 258         int             result;
 259
 260         t = db_read_token();
 261         if (t == tEOL || t == tSEMI_COLON) {
 262             /* empty line repeats last command, at 'next' */
 263             cmd = *last_cmdp;
 264             count = *last_countp;
 265             modifp = last_modifp;
 266             addr = (db_expr_t)db_next;
 267             have_addr = FALSE;
 268             if (t == tSEMI_COLON)
 269                 db_unread_token(t);
 270         }
 271         else if (t == tEXCL) {
 272             db_fncall();
 273             return;
 274         }
 275         else if (t != tIDENT) {
 276             db_printf("?\n");
 277             db_flush_lex();
 278             return;
 279         }
 280         else {
 281             /*
 282              * Search for command
 283              */
 284             while (cmd_table) {
 285                 result = db_cmd_search(db_tok_string,
 286                                        cmd_table,
 287                                        &cmd);
 288                 switch (result) {
 289                     case CMD_NONE:
 290                         if (db_exec_macro(db_tok_string) == 0)
 291                             return;
 292                         db_printf("No such command \"%s\"\n", db_tok_string);
 293                         db_flush_lex();
 294                         return;
 295                     case CMD_AMBIGUOUS:
 296                         db_printf("Ambiguous\n");
 297                         db_flush_lex();
 298                         return;
 299                     case CMD_HELP:
 300                         db_cmd_list(cmd_table);
 301                         db_flush_lex();
 302                         return;
 303                     default:
 304                         break;
 305                 }
 306                 if ((cmd_table = cmd->more) != 0) {
 307                     t = db_read_token();
 308                     if (t != tIDENT) {
 309                         db_cmd_list(cmd_table);
 310                         db_flush_lex();
 311                         return;
 312                     }
 313                 }
 314             }
 315
 316             if ((cmd->flag & CS_OWN) == 0) {
 317                 /*
 318                  * Standard syntax:
 319                  * command [/modifier] [addr] [,count]
 320                  */
 321                 t = db_read_token();
 322                 if (t == tSLASH) {
 323                     t = db_read_token();
 324                     if (t != tIDENT) {
 325                         db_printf("Bad modifier \"/%s\"\n", db_tok_string);
 326                         db_flush_lex();
 327                         return;
 328                     }
 329                     strcpy(modif, db_tok_string);
 330                 }
 331                 else {
 332                     db_unread_token(t);
 333                     modif[0] = '\0';
 334                 }
 335
 336                 if (db_expression(&addr)) {
 337                     db_dot = (db_addr_t) addr;
 338                     db_last_addr = db_dot;
 339                     have_addr = TRUE;
 340                 }
 341                 else {
 342                     addr = (db_expr_t) db_dot;
 343                     have_addr = FALSE;
 344                 }
 345                 t = db_read_token();
 346                 if (t == tCOMMA) {
 347                     if (!db_expression(&count)) {
 348                         db_printf("Count missing after ','\n");
 349                         db_flush_lex();
 350                         return;
 351                     }
 352                 }
 353                 else {
 354                     db_unread_token(t);
 355                     count = -1;
 356                 }
 357             }
 358         }
 359         if (cmd != 0) {
 360             /*
 361              * Execute the command.
 362              */
 363             (*cmd->fcn)(addr, have_addr, count, modifp);
 364
 365             if (cmd->flag & CS_SET_DOT) {
 366                 /*
 367                  * If command changes dot, set dot to
 368                  * previous address displayed (if 'ed' style).
 369                  */
 370                 if (db_ed_style) {
 371                     db_dot = db_prev;
 372                 }
 373                 else {
 374                     db_dot = db_next;
 375                 }
 376             }
 377             else {
 378                 /*
 379                  * If command does not change dot,
 380                  * set 'next' location to be the same.
 381                  */
 382                 db_next = db_dot;
 383             }
 384         }
 385         *last_cmdp = cmd;
 386         *last_countp = count;
 387         strcpy(last_modifp, modifp);
 388 }
 389
 390 void
 391 db_command_list(
 392         struct db_command       **last_cmdp,    /* IN_OUT */
 393         db_expr_t               *last_countp,   /* IN_OUT */
 394         char                    *last_modifp,   /* IN_OUT */
 395         struct db_command       *cmd_table)
 396 {
 397         do {
 398             db_command(last_cmdp, last_countp, last_modifp, cmd_table);
 399             db_skip_to_eol();
 400         } while (db_read_token() == tSEMI_COLON && db_cmd_loop_done == 0);
 401 }
 402
 403
 404 extern void     db_system_stats(void);
 405
 406 struct db_command db_show_all_cmds[] = {
 407         { "acts",       db_show_all_acts,                       0,      0 },
 408         { "spaces",     db_show_all_spaces,                     0,      0 },
 409         { "tasks",      db_show_all_acts,                       0,      0 },
 410         /* temporary alias for sanity preservation */
 411         { "threads",    db_show_all_acts,                       0,      0 },
 412         { "zones",      db_show_all_zones,                      0,      0 },
 413         { "vmtask",     db_show_all_task_vm,                    0,      0 },
 414         { (char *)0 }
 415 };
 416
 417 /* XXX */
 418
 419 extern void             db_show_thread_log(void);
 420 extern void             db_show_one_lock(lock_t*);
 421 extern void             db_show_etap_log(db_expr_t, int, db_expr_t, char *);
 422
 423 struct db_command db_show_cmds[] = {
 424         { "all",        0,                              0,      db_show_all_cmds },
 425         { "registers",  db_show_regs,                   0,      0 },
 426         { "variables",  (db_func) db_show_variable,     CS_OWN, 0 },
 427         { "breaks",     (db_func) db_listbreak_cmd,     0,      0 },
 428         { "watches",    (db_func) db_listwatch_cmd,     0,      0 },
 429         { "task",       db_show_one_task,               0,      0 },
 430         { "act",        db_show_one_act,                0,      0 },
 431         { "shuttle",    db_show_shuttle,                0,      0 },
 432 #if 0
 433         { "thread",     db_show_one_thread,             0,      0 },
 434 #endif
 435         { "vmtask",     db_show_one_task_vm,            0,      0 },
 436         { "macro",      (db_func) db_show_macro,        CS_OWN, 0 },
 437         { "runq",       (db_func) db_show_runq,         0,      0 },
 438         { "map",        (db_func) vm_map_print,         0,      0 },
 439         { "object",     (db_func) vm_object_print,      0,      0 },
 440         { "page",       (db_func) vm_page_print,        0,      0 },
 441         { "copy",       (db_func) vm_map_copy_print,    0,      0 },
 442         { "port",       (db_func) ipc_port_print,       0,      0 },
 443         { "pset",       (db_func) ipc_pset_print,       0,      0 },
 444         { "kmsg",       (db_func) ipc_kmsg_print,       0,      0 },
 445         { "msg",        (db_func) ipc_msg_print,        0,      0 },
 446         { "ipc_port",   db_show_port_id,                0,      0 },
 447 #if     NORMA_VM
 448         { "xmm_obj",    (db_func) xmm_obj_print,        0,      0 },
 449         { "xmm_reply",  (db_func) xmm_reply_print,      0,      0 },
 450 #endif  /* NORMA_VM */
 451 #if     TRACE_BUFFER
 452         { "tr",         db_show_tr,                     0,      0 },
 453 #endif  /* TRACE_BUFFER */
 454         { "space",      db_show_one_space,              0,      0 },
 455         { "system",     (db_func) db_system_stats,      0,      0 },
 456         { "zone",       db_show_one_zone,               0,      0 },
 457         { "lock",       (db_func)db_show_one_lock,      0,      0 },
 458         { "mutex_lock", (db_func)db_show_one_mutex,     0,      0 },
 459         { "simple_lock", (db_func)db_show_one_simple_lock,      0,      0 },
 460         { "thread_log", (db_func)db_show_thread_log,    0,      0 },
 461         { "shuttle",    db_show_shuttle,                0,      0 },
 462         { (char *)0, }
 463 };
 464
 465 #define db_switch_cpu kdb_on
 466 extern void     db_switch_cpu(int);
 467
 468 struct db_command db_command_table[] = {
 469 #if DB_MACHINE_COMMANDS
 470
 471 /* this must be the first entry, if it exists */
 472         { "machine",    0,                              0,                      0 },
 473 #endif
 474         { "print",      (db_func) db_print_cmd,         CS_OWN,                 0 },
 475         { "examine",    db_examine_cmd,                 CS_MORE|CS_SET_DOT,     0 },
 476         { "x",          db_examine_cmd,                 CS_MORE|CS_SET_DOT,     0 },
 477         { "xf",         db_examine_forward,             CS_SET_DOT,             0 },
 478         { "xb",         db_examine_backward,            CS_SET_DOT,             0 },
 479         { "search",     (db_func) db_search_cmd,        CS_OWN|CS_SET_DOT,      0 },
 480         { "set",        (db_func) db_set_cmd,           CS_OWN,                 0 },
 481         { "write",      db_write_cmd,                   CS_MORE|CS_SET_DOT,     0 },
 482         { "w",          db_write_cmd,                   CS_MORE|CS_SET_DOT,     0 },
 483         { "delete",     (db_func) db_delete_cmd,        CS_OWN,                 0 },
 484         { "d",          (db_func) db_delete_cmd,        CS_OWN,                 0 },
 485         { "break",      db_breakpoint_cmd,              CS_MORE,                0 },
 486         { "dwatch",     db_deletewatch_cmd,             CS_MORE,                0 },
 487         { "watch",      db_watchpoint_cmd,              CS_MORE,                0 },
 488         { "step",       db_single_step_cmd,             0,                      0 },
 489         { "s",          db_single_step_cmd,             0,                      0 },
 490         { "continue",   db_continue_cmd,                0,                      0 },
 491         { "c",          db_continue_cmd,                0,                      0 },
 492         { "gdb",        db_continue_gdb,                0,                      0 },
 493         { "until",      db_trace_until_call_cmd,        0,                      0 },
 494
 495         /* As per request of DNoveck, CR1550, leave this disabled       */
 496 #if 0   /* until CR1440 is fixed, to avoid toe-stubbing                 */
 497         { "next",       db_trace_until_matching_cmd,    0,                      0 },
 498 #endif
 499         { "match",      db_trace_until_matching_cmd,    0       ,               0 },
 500         { "trace",      db_stack_trace_cmd,             0,                      0 },
 501         { "cond",       (db_func) db_cond_cmd,          CS_OWN,                 0 },
 502         { "call",       (db_func) db_fncall,            CS_OWN,                 0 },
 503         { "macro",      (db_func) db_def_macro_cmd,     CS_OWN,                 0 },
 504         { "dmacro",     (db_func) db_del_macro_cmd,     CS_OWN,                 0 },
 505         { "show",       0,                              0,                      db_show_cmds },
 506         { "cpu",        (db_func) db_switch_cpu,        0,                      0 },
 507         { "reboot",     (db_func) db_reboot,            0,                      0 },
 508 #if defined(__ppc__)
 509         { "lt",         db_low_trace,                   CS_MORE|CS_SET_DOT,     0 },
 510         { "dl",         db_display_long,                CS_MORE|CS_SET_DOT,     0 },
 511         { "dc",         db_display_char,                CS_MORE|CS_SET_DOT,     0 },
 512         { "dr",         db_display_real,                CS_MORE|CS_SET_DOT,     0 },
 513         { "dv",         db_display_virtual,             CS_MORE|CS_SET_DOT,     0 },
 514         { "dm",         db_display_mappings,    CS_MORE|CS_SET_DOT,     0 },
 515         { "dh",         db_display_hash,                CS_MORE|CS_SET_DOT,     0 },
 516         { "dp",         db_display_pmap,                CS_MORE,                        0 },
 517         { "di",         db_display_iokit,               CS_MORE,                        0 },
 518         { "ds",         db_display_save,                CS_MORE|CS_SET_DOT,     0 },
 519         { "dx",         db_display_xregs,               CS_MORE|CS_SET_DOT,     0 },
 520         { "dk",         db_display_kmod,                CS_MORE,                        0 },
 521         { "gs",         db_gsnoop,                              CS_MORE,                        0 },
 522         { "cm",         db_check_mappings,              CS_MORE,                        0 },
 523         { "cp",         db_check_pmaps,                 CS_MORE,                        0 },
 524 #endif
 525         { (char *)0, }
 526 };
 527
 528 /* this function should be called to install the machine dependent
 529    commands. It should be called before the debugger is enabled  */
 530 void db_machine_commands_install(struct db_command *ptr)
 531 {
 532   db_command_table[0].more = ptr;
 533   return;
 534 }
 535
 536
 537 struct db_command       *db_last_command = 0;
 538 db_expr_t               db_last_count = 0;
 539 char                    db_last_modifier[TOK_STRING_SIZE] = { '\0' };
 540
 541 void
 542 db_help_cmd(void)
 543 {
 544         struct db_command *cmd = db_command_table;
 545
 546         while (cmd->name != 0) {
 547             db_printf("%-12s", cmd->name);
 548             db_end_line();
 549             cmd++;
 550         }
 551 }
 552
 553 int     (*ddb_display)(void);
 554
 555 void
 556 db_command_loop(void)
 557 {
 558         jmp_buf_t db_jmpbuf;
 559         jmp_buf_t *prev = db_recover;
 560         extern int db_output_line;
 561         extern int db_macro_level;
 562         extern int db_indent;
 563
 564         /*
 565          * Initialize 'prev' and 'next' to dot.
 566          */
 567         db_prev = db_dot;
 568         db_next = db_dot;
 569
 570         if (ddb_display)
 571                 (*ddb_display)();
 572
 573         db_cmd_loop_done = 0;
 574         while (!db_cmd_loop_done) {
 575             (void) _setjmp(db_recover = &db_jmpbuf);
 576             db_macro_level = 0;
 577             if (db_print_position() != 0)
 578                 db_printf("\n");
 579             db_output_line = 0;
 580             db_indent = 0;
 581             db_reset_more();
 582             db_output_prompt();
 583
 584             (void) db_read_line("!!");
 585             db_command_list(&db_last_command, &db_last_count,
 586                             db_last_modifier, db_command_table);
 587         }
 588
 589         db_recover = prev;
 590 }
 591
 592 boolean_t
 593 db_exec_cmd_nest(
 594         const char      *cmd,
 595         int             size)
 596 {
 597         struct db_lex_context lex_context;
 598
 599         db_cmd_loop_done = 0;
 600         if (cmd) {
 601             db_save_lex_context(&lex_context);
 602             db_switch_input(cmd, size);
 603         }
 604         db_command_list(&db_last_command, &db_last_count,
 605                         db_last_modifier, db_command_table);
 606         if (cmd)
 607             db_restore_lex_context(&lex_context);
 608         return(db_cmd_loop_done == 0);
 609 }
 610
 611 void
 612 db_error(const char *s)
 613 {
 614         extern int db_macro_level;
 615
 616         db_macro_level = 0;
 617         if (db_recover) {
 618             if (s > (char *)1)
 619                 db_printf(s);
 620             db_flush_lex();
 621             _longjmp(db_recover, (s == (char *)1) ? 2 : 1);
 622         }
 623         else
 624         {
 625             if (s > (char *)1)
 626                 db_printf(s);
 627             panic("db_error");
 628         }
 629 }
 630
 631
 632 /*
 633  * Call random function:
 634  * !expr(arg,arg,arg)
 635  */
 636 void
 637 db_fncall(void)
 638 {
 639         db_expr_t       fn_addr;
 640 #define MAXARGS         11
 641         uint32_t        args[MAXARGS];
 642         db_expr_t argwork;
 643         int             nargs = 0;
 644         uint32_t        retval;
 645         uint32_t        (*func)(uint32_t, ...);
 646         int             t;
 647
 648         if (!db_expression(&fn_addr)) {
 649             db_printf("Bad function \"%s\"\n", db_tok_string);
 650             db_flush_lex();
 651             return;
 652         }
 653         func = (uint32_t (*) (uint32_t, ...)) fn_addr;
 654
 655         t = db_read_token();
 656         if (t == tLPAREN) {
 657             if (db_expression(&argwork)) {
 658                         args[nargs] = (uint32_t)argwork;
 659                         nargs++;
 660                         while ((t = db_read_token()) == tCOMMA) {
 661                                 if (nargs == MAXARGS) {
 662                                         db_printf("Too many arguments\n");
 663                                         db_flush_lex();
 664                                         return;
 665                                 }
 666                                 if (!db_expression(&argwork)) {
 667                                         db_printf("Argument missing\n");
 668                                         db_flush_lex();
 669                                         return;
 670                                 }
 671                                 args[nargs] = (uint32_t)argwork;
 672                                 nargs++;
 673                         }
 674                         db_unread_token(t);
 675             }
 676             if (db_read_token() != tRPAREN) {
 677                         db_printf("?\n");
 678                         db_flush_lex();
 679                         return;
 680             }
 681         }
 682         while (nargs < MAXARGS) {
 683             args[nargs++] = 0;
 684         }
 685
 686         retval = (*func)(args[0], args[1], args[2], args[3], args[4],
 687                          args[5], args[6], args[7], args[8], args[9] );
 688         db_printf(" %#n\n", retval);
 689 }
 690
 691 boolean_t
 692 db_option(
 693         const char      *modif,
 694         int             option)
 695 {
 696         register char *p;
 697
 698         for (p = modif; *p; p++)
 699             if (*p == option)
 700                 return(TRUE);
 701         return(FALSE);
 702 }