osfmk/ddb/db_command.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55 /*
  56  *      Author: David B. Golub, Carnegie Mellon University
  57  *      Date:   7/90
  58  */
  59
  60 /*
  61  * Command dispatcher.
  62  */
  63 #include <cpus.h>
  64 #include <norma_vm.h>
  65 #ifdef  AT386
  66 #include <norma_scsi.h>
  67 #endif  /* AT386 */
  68
  69 #include <mach/boolean.h>
  70 #include <string.h>
  71 #include <machine/db_machdep.h>
  72
  73 #if defined(__alpha)
  74 #  include <kdebug.h>
  75 #  if KDEBUG
  76 #    include <machine/kdebug.h>
  77 #  endif
  78 #endif /* defined(__alpha) */
  79
  80 #include <ddb/db_lex.h>
  81 #include <ddb/db_output.h>
  82 #include <ddb/db_break.h>
  83 #include <ddb/db_command.h>
  84 #include <ddb/db_cond.h>
  85 #include <ddb/db_examine.h>
  86 #include <ddb/db_expr.h>
  87 #include <ppc/db_low_trace.h>
  88 #include <ddb/db_macro.h>
  89 #include <ddb/db_print.h>
  90 #include <ddb/db_run.h>
  91 #include <ddb/db_task_thread.h>
  92 #include <ddb/db_variables.h>
  93 #include <ddb/db_watch.h>
  94 #include <ddb/db_write_cmd.h>
  95 #include <ddb/tr.h>
  96
  97 #include <machine/setjmp.h>
  98 #include <kern/thread.h>
  99
 100 #include <kern/misc_protos.h>
 101 #include <vm/vm_print.h>
 102 #include <ipc/ipc_print.h>
 103 #include <kern/kern_print.h>
 104 #include <machine/db_machdep.h>         /* For db_stack_trace_cmd(). */
 105 #include <kern/zalloc.h>        /* For db_show_one_zone, db_show_all_zones. */
 106 #include <kern/lock.h>                  /* For db_show_all_slocks(). */
 107
 108 #if     NORMA_VM
 109 #include <xmm/xmm_obj.h>
 110 #endif  /* NORMA_VM */
 111
 112 /*
 113  * Exported global variables
 114  */
 115 boolean_t       db_cmd_loop_done;
 116 jmp_buf_t       *db_recover = 0;
 117 db_addr_t       db_dot;
 118 db_addr_t       db_last_addr;
 119 db_addr_t       db_prev;
 120 db_addr_t       db_next;
 121
 122 /*
 123  * if 'ed' style: 'dot' is set at start of last item printed,
 124  * and '+' points to next line.
 125  * Otherwise: 'dot' points to next item, '..' points to last.
 126  */
 127 boolean_t       db_ed_style = TRUE;
 128
 129 /*
 130  * Results of command search.
 131  */
 132 #define CMD_UNIQUE      0
 133 #define CMD_FOUND       1
 134 #define CMD_NONE        2
 135 #define CMD_AMBIGUOUS   3
 136 #define CMD_HELP        4
 137
 138 /* Prototypes for functions local to this file.  XXX -- should be static!
 139  */
 140
 141 void db_command(
 142         struct db_command       **last_cmdp,    /* IN_OUT */
 143         db_expr_t               *last_countp,   /* IN_OUT */
 144         char                    *last_modifp,   /* IN_OUT */
 145         struct db_command       *cmd_table);
 146
 147 void db_help_cmd(void);
 148
 149 void db_output_prompt(void);
 150
 151 void db_fncall(void);
 152
 153 void db_cmd_list(struct db_command *table);
 154
 155 int db_cmd_search(
 156         char *                  name,
 157         struct db_command *     table,
 158         struct db_command **    cmdp);  /* out */
 159
 160 void db_command_list(
 161         struct db_command       **last_cmdp,    /* IN_OUT */
 162         db_expr_t               *last_countp,   /* IN_OUT */
 163         char                    *last_modifp,   /* IN_OUT */
 164         struct db_command       *cmd_table);
 165
 166
 167
 168 /*
 169  * Search for command prefix.
 170  */
 171 int
 172 db_cmd_search(
 173         char *                  name,
 174         struct db_command *     table,
 175         struct db_command **    cmdp)   /* out */
 176 {
 177         struct db_command       *cmd;
 178         int             result = CMD_NONE;
 179
 180         for (cmd = table; cmd->name != 0; cmd++) {
 181             register char *lp;
 182             register char *rp;
 183             register int  c;
 184
 185             lp = name;
 186             rp = cmd->name;
 187             while ((c = *lp) == *rp) {
 188                 if (c == 0) {
 189                     /* complete match */
 190                     *cmdp = cmd;
 191                     return (CMD_UNIQUE);
 192                 }
 193                 lp++;
 194                 rp++;
 195             }
 196             if (c == 0) {
 197                 /* end of name, not end of command -
 198                    partial match */
 199                 if (result == CMD_FOUND) {
 200                     result = CMD_AMBIGUOUS;
 201                     /* but keep looking for a full match -
 202                        this lets us match single letters */
 203                 }
 204                 else {
 205                     *cmdp = cmd;
 206                     result = CMD_FOUND;
 207                 }
 208             }
 209         }
 210         if (result == CMD_NONE) {
 211             /* check for 'help' */
 212             if (!strncmp(name, "help", strlen(name)))
 213                 result = CMD_HELP;
 214         }
 215         return (result);
 216 }
 217
 218 void
 219 db_cmd_list(struct db_command *table)
 220 {
 221         register struct db_command *new;
 222         register struct db_command *old;
 223         register struct db_command *cur;
 224         unsigned int l;
 225         unsigned int len;
 226
 227         len = 1;
 228         for (cur = table; cur->name != 0; cur++)
 229             if ((l = strlen(cur->name)) >= len)
 230                 len = l + 1;
 231
 232         old = (struct db_command *)0;
 233         for (;;) {
 234             new = (struct db_command *)0;
 235             for (cur = table; cur->name != 0; cur++)
 236                 if ((new == (struct db_command *)0 ||
 237                      strcmp(cur->name, new->name) < 0) &&
 238                     (old == (struct db_command *)0 ||
 239                      strcmp(cur->name, old->name) > 0))
 240                     new = cur;
 241             if (new == (struct db_command *)0)
 242                     return;
 243             db_reserve_output_position(len);
 244             db_printf("%-*s", len, new->name);
 245             old = new;
 246         }
 247 }
 248
 249 void
 250 db_command(
 251         struct db_command       **last_cmdp,    /* IN_OUT */
 252         db_expr_t               *last_countp,   /* IN_OUT */
 253         char                    *last_modifp,   /* IN_OUT */
 254         struct db_command       *cmd_table)
 255 {
 256         struct db_command       *cmd;
 257         int             t;
 258         char            modif[TOK_STRING_SIZE];
 259         char            *modifp = &modif[0];
 260         db_expr_t       addr, count;
 261         boolean_t       have_addr;
 262         int             result;
 263
 264         t = db_read_token();
 265         if (t == tEOL || t == tSEMI_COLON) {
 266             /* empty line repeats last command, at 'next' */
 267             cmd = *last_cmdp;
 268             count = *last_countp;
 269             modifp = last_modifp;
 270             addr = (db_expr_t)db_next;
 271             have_addr = FALSE;
 272             if (t == tSEMI_COLON)
 273                 db_unread_token(t);
 274         }
 275         else if (t == tEXCL) {
 276             db_fncall();
 277             return;
 278         }
 279         else if (t != tIDENT) {
 280             db_printf("?\n");
 281             db_flush_lex();
 282             return;
 283         }
 284         else {
 285             /*
 286              * Search for command
 287              */
 288             while (cmd_table) {
 289                 result = db_cmd_search(db_tok_string,
 290                                        cmd_table,
 291                                        &cmd);
 292                 switch (result) {
 293                     case CMD_NONE:
 294                         if (db_exec_macro(db_tok_string) == 0)
 295                             return;
 296                         db_printf("No such command \"%s\"\n", db_tok_string);
 297                         db_flush_lex();
 298                         return;
 299                     case CMD_AMBIGUOUS:
 300                         db_printf("Ambiguous\n");
 301                         db_flush_lex();
 302                         return;
 303                     case CMD_HELP:
 304                         db_cmd_list(cmd_table);
 305                         db_flush_lex();
 306                         return;
 307                     default:
 308                         break;
 309                 }
 310                 if ((cmd_table = cmd->more) != 0) {
 311                     t = db_read_token();
 312                     if (t != tIDENT) {
 313                         db_cmd_list(cmd_table);
 314                         db_flush_lex();
 315                         return;
 316                     }
 317                 }
 318             }
 319
 320             if ((cmd->flag & CS_OWN) == 0) {
 321                 /*
 322                  * Standard syntax:
 323                  * command [/modifier] [addr] [,count]
 324                  */
 325                 t = db_read_token();
 326                 if (t == tSLASH) {
 327                     t = db_read_token();
 328                     if (t != tIDENT) {
 329                         db_printf("Bad modifier \"/%s\"\n", db_tok_string);
 330                         db_flush_lex();
 331                         return;
 332                     }
 333                     strcpy(modif, db_tok_string);
 334                 }
 335                 else {
 336                     db_unread_token(t);
 337                     modif[0] = '\0';
 338                 }
 339
 340                 if (db_expression(&addr)) {
 341                     db_dot = (db_addr_t) addr;
 342                     db_last_addr = db_dot;
 343                     have_addr = TRUE;
 344                 }
 345                 else {
 346                     addr = (db_expr_t) db_dot;
 347                     have_addr = FALSE;
 348                 }
 349                 t = db_read_token();
 350                 if (t == tCOMMA) {
 351                     if (!db_expression(&count)) {
 352                         db_printf("Count missing after ','\n");
 353                         db_flush_lex();
 354                         return;
 355                     }
 356                 }
 357                 else {
 358                     db_unread_token(t);
 359                     count = -1;
 360                 }
 361             }
 362         }
 363         if (cmd != 0) {
 364             /*
 365              * Execute the command.
 366              */
 367             (*cmd->fcn)(addr, have_addr, count, modifp);
 368
 369             if (cmd->flag & CS_SET_DOT) {
 370                 /*
 371                  * If command changes dot, set dot to
 372                  * previous address displayed (if 'ed' style).
 373                  */
 374                 if (db_ed_style) {
 375                     db_dot = db_prev;
 376                 }
 377                 else {
 378                     db_dot = db_next;
 379                 }
 380             }
 381             else {
 382                 /*
 383                  * If command does not change dot,
 384                  * set 'next' location to be the same.
 385                  */
 386                 db_next = db_dot;
 387             }
 388         }
 389         *last_cmdp = cmd;
 390         *last_countp = count;
 391         strcpy(last_modifp, modifp);
 392 }
 393
 394 void
 395 db_command_list(
 396         struct db_command       **last_cmdp,    /* IN_OUT */
 397         db_expr_t               *last_countp,   /* IN_OUT */
 398         char                    *last_modifp,   /* IN_OUT */
 399         struct db_command       *cmd_table)
 400 {
 401         do {
 402             db_command(last_cmdp, last_countp, last_modifp, cmd_table);
 403             db_skip_to_eol();
 404         } while (db_read_token() == tSEMI_COLON && db_cmd_loop_done == 0);
 405 }
 406
 407
 408 extern void     db_system_stats(void);
 409
 410 struct db_command db_show_all_cmds[] = {
 411 #if     USLOCK_DEBUG
 412         { "slocks",     (db_func) db_show_all_slocks,           0,      0 },
 413 #endif  /* USLOCK_DEBUG */
 414         { "acts",       db_show_all_acts,                       0,      0 },
 415         { "spaces",     db_show_all_spaces,                     0,      0 },
 416         { "tasks",      db_show_all_acts,                       0,      0 },
 417         /* temporary alias for sanity preservation */
 418         { "threads",    db_show_all_acts,                       0,      0 },
 419         { "zones",      db_show_all_zones,                      0,      0 },
 420         { "vmtask",     db_show_all_task_vm,                    0,      0 },
 421         { (char *)0 }
 422 };
 423
 424 /* XXX */
 425
 426 extern void             db_show_thread_log(void);
 427 extern void             db_show_one_lock(lock_t*);
 428 extern void             db_show_etap_log(db_expr_t, int, db_expr_t, char *);
 429
 430 struct db_command db_show_cmds[] = {
 431         { "all",        0,                              0,      db_show_all_cmds },
 432         { "registers",  db_show_regs,                   0,      0 },
 433         { "variables",  (db_func) db_show_variable,     CS_OWN, 0 },
 434         { "breaks",     (db_func) db_listbreak_cmd,     0,      0 },
 435         { "watches",    (db_func) db_listwatch_cmd,     0,      0 },
 436         { "task",       db_show_one_task,               0,      0 },
 437         { "act",        db_show_one_act,                0,      0 },
 438         { "shuttle",    db_show_shuttle,                0,      0 },
 439 #if 0
 440         { "thread",     db_show_one_thread,             0,      0 },
 441 #endif
 442         { "vmtask",     db_show_one_task_vm,            0,      0 },
 443         { "macro",      (db_func) db_show_macro,        CS_OWN, 0 },
 444         { "runq",       (db_func) db_show_runq,         0,      0 },
 445         { "map",        (db_func) vm_map_print,         0,      0 },
 446         { "object",     (db_func) vm_object_print,      0,      0 },
 447         { "page",       (db_func) vm_page_print,        0,      0 },
 448         { "copy",       (db_func) vm_map_copy_print,    0,      0 },
 449         { "port",       (db_func) ipc_port_print,       0,      0 },
 450         { "pset",       (db_func) ipc_pset_print,       0,      0 },
 451         { "kmsg",       (db_func) ipc_kmsg_print,       0,      0 },
 452         { "msg",        (db_func) ipc_msg_print,        0,      0 },
 453         { "ipc_port",   db_show_port_id,                0,      0 },
 454         { "lock",       (db_func)db_show_one_lock,      0,      0 },
 455 #if     NORMA_VM
 456         { "xmm_obj",    (db_func) xmm_obj_print,        0,      0 },
 457         { "xmm_reply",  (db_func) xmm_reply_print,      0,      0 },
 458 #endif  /* NORMA_VM */
 459 #if     TRACE_BUFFER
 460         { "tr",         db_show_tr,                     0,      0 },
 461 #endif  /* TRACE_BUFFER */
 462         { "space",      db_show_one_space,              0,      0 },
 463         { "system",     (db_func) db_system_stats,      0,      0 },
 464         { "zone",       db_show_one_zone,               0,      0 },
 465         { "simple_lock", db_show_one_simple_lock,       0,      0 },
 466         { "thread_log", (db_func)db_show_thread_log,    0,      0 },
 467         { "shuttle",    db_show_shuttle,                0,      0 },
 468         { (char *)0, }
 469 };
 470
 471 #if     NCPUS > 1
 472 #define db_switch_cpu kdb_on
 473 extern void     db_switch_cpu(int);
 474 #endif  /* NCPUS > 1 */
 475
 476 struct db_command db_command_table[] = {
 477 #if DB_MACHINE_COMMANDS
 478
 479 /* this must be the first entry, if it exists */
 480         { "machine",    0,                              0,                      0 },
 481 #endif
 482         { "print",      (db_func) db_print_cmd,         CS_OWN,                 0 },
 483         { "examine",    db_examine_cmd,                 CS_MORE|CS_SET_DOT,     0 },
 484         { "x",          db_examine_cmd,                 CS_MORE|CS_SET_DOT,     0 },
 485         { "xf",         db_examine_forward,             CS_SET_DOT,             0 },
 486         { "xb",         db_examine_backward,            CS_SET_DOT,             0 },
 487         { "search",     (db_func) db_search_cmd,        CS_OWN|CS_SET_DOT,      0 },
 488         { "set",        (db_func) db_set_cmd,           CS_OWN,                 0 },
 489         { "write",      db_write_cmd,                   CS_MORE|CS_SET_DOT,     0 },
 490         { "w",          db_write_cmd,                   CS_MORE|CS_SET_DOT,     0 },
 491         { "delete",     (db_func) db_delete_cmd,        CS_OWN,                 0 },
 492         { "d",          (db_func) db_delete_cmd,        CS_OWN,                 0 },
 493         { "break",      db_breakpoint_cmd,              CS_MORE,                0 },
 494         { "dwatch",     db_deletewatch_cmd,             CS_MORE,                0 },
 495         { "watch",      db_watchpoint_cmd,              CS_MORE,                0 },
 496         { "step",       db_single_step_cmd,             0,                      0 },
 497         { "s",          db_single_step_cmd,             0,                      0 },
 498         { "continue",   db_continue_cmd,                0,                      0 },
 499         { "c",          db_continue_cmd,                0,                      0 },
 500         { "gdb",        db_continue_gdb,                0,                      0 },
 501         { "until",      db_trace_until_call_cmd,        0,                      0 },
 502
 503         /* As per request of DNoveck, CR1550, leave this disabled       */
 504 #if 0   /* until CR1440 is fixed, to avoid toe-stubbing                 */
 505         { "next",       db_trace_until_matching_cmd,    0,                      0 },
 506 #endif
 507         { "match",      db_trace_until_matching_cmd,    0       ,               0 },
 508         { "trace",      db_stack_trace_cmd,             0,                      0 },
 509         { "cond",       (db_func) db_cond_cmd,          CS_OWN,                 0 },
 510         { "call",       (db_func) db_fncall,            CS_OWN,                 0 },
 511         { "macro",      (db_func) db_def_macro_cmd,     CS_OWN,                 0 },
 512         { "dmacro",     (db_func) db_del_macro_cmd,     CS_OWN,                 0 },
 513         { "show",       0,                              0,                      db_show_cmds },
 514 #if     NCPUS > 1
 515         { "cpu",        (db_func) db_switch_cpu,        0,                      0 },
 516 #endif  /* NCPUS > 1 */
 517         { "reboot",     (db_func) db_reboot,            0,                      0 },
 518 #if defined(__ppc__)
 519         { "lt",         db_low_trace,                   CS_MORE|CS_SET_DOT,     0 },
 520         { "dl",         db_display_long,                CS_MORE|CS_SET_DOT,     0 },
 521         { "dc",         db_display_char,                CS_MORE|CS_SET_DOT,     0 },
 522         { "dr",         db_display_real,                CS_MORE|CS_SET_DOT,     0 },
 523         { "dv",         db_display_virtual,             CS_MORE|CS_SET_DOT,     0 },
 524         { "dm",         db_display_mappings,    CS_MORE|CS_SET_DOT,     0 },
 525         { "dh",         db_display_hash,                CS_MORE|CS_SET_DOT,     0 },
 526         { "dp",         db_display_pmap,                CS_MORE,                        0 },
 527         { "di",         db_display_iokit,               CS_MORE,                        0 },
 528         { "ds",         db_display_save,                CS_MORE|CS_SET_DOT,     0 },
 529         { "dx",         db_display_xregs,               CS_MORE|CS_SET_DOT,     0 },
 530         { "dk",         db_display_kmod,                CS_MORE,                        0 },
 531         { "gs",         db_gsnoop,                              CS_MORE,                        0 },
 532         { "cm",         db_check_mappings,              CS_MORE,                        0 },
 533         { "cp",         db_check_pmaps,                 CS_MORE,                        0 },
 534 #endif
 535         { (char *)0, }
 536 };
 537
 538 /* this function should be called to install the machine dependent
 539    commands. It should be called before the debugger is enabled  */
 540 void db_machine_commands_install(struct db_command *ptr)
 541 {
 542   db_command_table[0].more = ptr;
 543   return;
 544 }
 545
 546
 547 struct db_command       *db_last_command = 0;
 548 db_expr_t               db_last_count = 0;
 549 char                    db_last_modifier[TOK_STRING_SIZE] = { '\0' };
 550
 551 void
 552 db_help_cmd(void)
 553 {
 554         struct db_command *cmd = db_command_table;
 555
 556         while (cmd->name != 0) {
 557             db_printf("%-12s", cmd->name);
 558             db_end_line();
 559             cmd++;
 560         }
 561 }
 562
 563 int     (*ddb_display)(void);
 564
 565 void
 566 db_command_loop(void)
 567 {
 568         jmp_buf_t db_jmpbuf;
 569         jmp_buf_t *prev = db_recover;
 570         extern int db_output_line;
 571         extern int db_macro_level;
 572         extern int db_indent;
 573
 574         /*
 575          * Initialize 'prev' and 'next' to dot.
 576          */
 577         db_prev = db_dot;
 578         db_next = db_dot;
 579
 580         if (ddb_display)
 581                 (*ddb_display)();
 582
 583         db_cmd_loop_done = 0;
 584         while (!db_cmd_loop_done) {
 585             (void) _setjmp(db_recover = &db_jmpbuf);
 586             db_macro_level = 0;
 587             if (db_print_position() != 0)
 588                 db_printf("\n");
 589             db_output_line = 0;
 590             db_indent = 0;
 591             db_reset_more();
 592             db_output_prompt();
 593
 594             (void) db_read_line("!!");
 595             db_command_list(&db_last_command, &db_last_count,
 596                             db_last_modifier, db_command_table);
 597         }
 598
 599         db_recover = prev;
 600 }
 601
 602 boolean_t
 603 db_exec_cmd_nest(
 604         char    *cmd,
 605         int     size)
 606 {
 607         struct db_lex_context lex_context;
 608
 609         db_cmd_loop_done = 0;
 610         if (cmd) {
 611             db_save_lex_context(&lex_context);
 612             db_switch_input(cmd, size);
 613         }
 614         db_command_list(&db_last_command, &db_last_count,
 615                         db_last_modifier, db_command_table);
 616         if (cmd)
 617             db_restore_lex_context(&lex_context);
 618         return(db_cmd_loop_done == 0);
 619 }
 620
 621 void
 622 db_error(char *s)
 623 {
 624         extern int db_macro_level;
 625
 626         db_macro_level = 0;
 627         if (db_recover) {
 628             if (s > (char *)1)
 629                 db_printf(s);
 630             db_flush_lex();
 631             _longjmp(db_recover, (s == (char *)1) ? 2 : 1);
 632         }
 633         else
 634         {
 635             if (s > (char *)1)
 636                 db_printf(s);
 637             panic("db_error");
 638         }
 639 }
 640
 641
 642 /*
 643  * Call random function:
 644  * !expr(arg,arg,arg)
 645  */
 646 void
 647 db_fncall(void)
 648 {
 649         db_expr_t       fn_addr;
 650 #define MAXARGS         11
 651         uint32_t        args[MAXARGS];
 652         db_expr_t argwork;
 653         int             nargs = 0;
 654         uint32_t        retval;
 655         uint32_t        (*func)(uint32_t, ...);
 656         int             t;
 657
 658         if (!db_expression(&fn_addr)) {
 659             db_printf("Bad function \"%s\"\n", db_tok_string);
 660             db_flush_lex();
 661             return;
 662         }
 663         func = (uint32_t (*) (uint32_t, ...)) fn_addr;
 664
 665         t = db_read_token();
 666         if (t == tLPAREN) {
 667             if (db_expression(&argwork)) {
 668                         args[nargs] = (uint32_t)argwork;
 669                         nargs++;
 670                         while ((t = db_read_token()) == tCOMMA) {
 671                                 if (nargs == MAXARGS) {
 672                                         db_printf("Too many arguments\n");
 673                                         db_flush_lex();
 674                                         return;
 675                                 }
 676                                 if (!db_expression(&argwork)) {
 677                                         db_printf("Argument missing\n");
 678                                         db_flush_lex();
 679                                         return;
 680                                 }
 681                                 args[nargs] = (uint32_t)argwork;
 682                                 nargs++;
 683                         }
 684                         db_unread_token(t);
 685             }
 686             if (db_read_token() != tRPAREN) {
 687                         db_printf("?\n");
 688                         db_flush_lex();
 689                         return;
 690             }
 691         }
 692         while (nargs < MAXARGS) {
 693             args[nargs++] = 0;
 694         }
 695
 696         retval = (*func)(args[0], args[1], args[2], args[3], args[4],
 697                          args[5], args[6], args[7], args[8], args[9] );
 698         db_printf(" %#n\n", retval);
 699 }
 700
 701 boolean_t
 702 db_option(
 703         char    *modif,
 704         int     option)
 705 {
 706         register char *p;
 707
 708         for (p = modif; *p; p++)
 709             if (*p == option)
 710                 return(TRUE);
 711         return(FALSE);
 712 }