db_command.c revision 1.60
1 /* $NetBSD: db_command.c,v 1.60 2001/06/03 00:32:25 matt Exp $ */ 2 3 /* 4 * Mach Operating System 5 * Copyright (c) 1991,1990 Carnegie Mellon University 6 * All Rights Reserved. 7 * 8 * Permission to use, copy, modify and distribute this software and its 9 * documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 16 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 29 #include "opt_ddb.h" 30 #include "opt_inet.h" 31 32 /* 33 * Command dispatcher. 34 */ 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/reboot.h> 38 #include <sys/proc.h> 39 #include <sys/vnode.h> 40 #include <sys/pool.h> 41 #include <sys/namei.h> 42 43 #include <machine/db_machdep.h> /* type definitions */ 44 45 #if defined(_KERNEL_OPT) 46 #include "opt_multiprocessor.h" 47 #endif 48 #ifdef MULTIPROCESSOR 49 #include <machine/cpu.h> 50 #endif 51 52 #include <ddb/db_lex.h> 53 #include <ddb/db_output.h> 54 #include <ddb/db_command.h> 55 #include <ddb/db_break.h> 56 #include <ddb/db_watch.h> 57 #include <ddb/db_run.h> 58 #include <ddb/db_variables.h> 59 #include <ddb/db_interface.h> 60 #include <ddb/db_sym.h> 61 #include <ddb/db_extern.h> 62 63 #include <uvm/uvm_extern.h> 64 #include <uvm/uvm_ddb.h> 65 66 #include "arp.h" 67 68 /* 69 * Exported global variables 70 */ 71 boolean_t db_cmd_loop_done; 72 label_t *db_recover; 73 74 /* 75 * if 'ed' style: 'dot' is set at start of last item printed, 76 * and '+' points to next line. 77 * Otherwise: 'dot' points to next item, '..' points to last. 78 */ 79 boolean_t db_ed_style = TRUE; 80 81 /* 82 * Utility routine - discard tokens through end-of-line. 83 */ 84 void 85 db_skip_to_eol() 86 { 87 int t; 88 do { 89 t = db_read_token(); 90 } while (t != tEOL); 91 } 92 93 /* 94 * Results of command search. 95 */ 96 #define CMD_UNIQUE 0 97 #define CMD_FOUND 1 98 #define CMD_NONE 2 99 #define CMD_AMBIGUOUS 3 100 #define CMD_HELP 4 101 102 /* 103 * Search for command prefix. 104 */ 105 int 106 db_cmd_search(name, table, cmdp) 107 const char *name; 108 const struct db_command *table; 109 const struct db_command **cmdp; /* out */ 110 { 111 const struct db_command *cmd; 112 int result = CMD_NONE; 113 114 for (cmd = table; cmd->name != 0; cmd++) { 115 const char *lp; 116 const char *rp; 117 int c; 118 119 lp = name; 120 rp = cmd->name; 121 while ((c = *lp) == *rp) { 122 if (c == 0) { 123 /* complete match */ 124 *cmdp = cmd; 125 return (CMD_UNIQUE); 126 } 127 lp++; 128 rp++; 129 } 130 if (c == 0) { 131 /* end of name, not end of command - 132 partial match */ 133 if (result == CMD_FOUND) { 134 result = CMD_AMBIGUOUS; 135 /* but keep looking for a full match - 136 this lets us match single letters */ 137 } 138 else { 139 *cmdp = cmd; 140 result = CMD_FOUND; 141 } 142 } 143 } 144 if (result == CMD_NONE) { 145 /* check for 'help' */ 146 if (name[0] == 'h' && name[1] == 'e' 147 && name[2] == 'l' && name[3] == 'p') 148 result = CMD_HELP; 149 } 150 return (result); 151 } 152 153 void 154 db_cmd_list(table) 155 const struct db_command *table; 156 { 157 int i, j, w, columns, lines, width=0, items, numcmds; 158 const char *p; 159 160 for (numcmds = 0; table[numcmds].name != NULL; numcmds++) { 161 w = strlen(table[numcmds].name); 162 if (w > width) 163 width = w; 164 } 165 width = DB_NEXT_TAB(width); 166 items = 0; 167 168 columns = db_max_width / width; 169 if (columns == 0) 170 columns = 1; 171 lines = (numcmds + columns - 1) / columns; 172 for (i = 0; i < lines; i++) { 173 for (j = 0; j < columns; j++) { 174 p = table[j * lines + i].name; 175 if (p) 176 db_printf("%s", p); 177 if (j * lines + i + lines >= numcmds) { 178 db_putchar('\n'); 179 break; 180 } 181 w = strlen(p); 182 while (w < width) { 183 w = DB_NEXT_TAB(w); 184 db_putchar('\t'); 185 } 186 } 187 } 188 } 189 190 void 191 db_command(last_cmdp, cmd_table) 192 const struct db_command **last_cmdp; /* IN_OUT */ 193 const struct db_command *cmd_table; 194 { 195 const struct db_command *cmd; 196 int t; 197 char modif[TOK_STRING_SIZE]; 198 db_expr_t addr, count; 199 boolean_t have_addr = FALSE; 200 int result; 201 202 static db_expr_t last_count = 0; 203 204 t = db_read_token(); 205 if ((t == tEOL) || (t == tCOMMA)) { 206 /* 207 * An empty line repeats last command, at 'next'. 208 * Only a count repeats the last command with the new count. 209 */ 210 cmd = *last_cmdp; 211 addr = (db_expr_t)db_next; 212 if (t == tCOMMA) { 213 if (!db_expression(&count)) { 214 db_printf("Count missing\n"); 215 db_flush_lex(); 216 return; 217 } 218 } else 219 count = last_count; 220 have_addr = FALSE; 221 modif[0] = '\0'; 222 db_skip_to_eol(); 223 } 224 else if (t == tEXCL) { 225 db_fncall(0, 0, 0, NULL); 226 return; 227 } 228 else if (t != tIDENT) { 229 db_printf("?\n"); 230 db_flush_lex(); 231 return; 232 } 233 else { 234 /* 235 * Search for command 236 */ 237 while (cmd_table) { 238 result = db_cmd_search(db_tok_string, 239 cmd_table, 240 &cmd); 241 switch (result) { 242 case CMD_NONE: 243 db_printf("No such command\n"); 244 db_flush_lex(); 245 return; 246 case CMD_AMBIGUOUS: 247 db_printf("Ambiguous\n"); 248 db_flush_lex(); 249 return; 250 case CMD_HELP: 251 db_cmd_list(cmd_table); 252 db_flush_lex(); 253 return; 254 default: 255 break; 256 } 257 if ((cmd_table = cmd->more) != 0) { 258 t = db_read_token(); 259 if (t != tIDENT) { 260 db_cmd_list(cmd_table); 261 db_flush_lex(); 262 return; 263 } 264 } 265 } 266 267 if ((cmd->flag & CS_OWN) == 0) { 268 /* 269 * Standard syntax: 270 * command [/modifier] [addr] [,count] 271 */ 272 t = db_read_token(); 273 if (t == tSLASH) { 274 t = db_read_token(); 275 if (t != tIDENT) { 276 db_printf("Bad modifier\n"); 277 db_flush_lex(); 278 return; 279 } 280 db_strcpy(modif, db_tok_string); 281 } 282 else { 283 db_unread_token(t); 284 modif[0] = '\0'; 285 } 286 287 if (db_expression(&addr)) { 288 db_dot = (db_addr_t) addr; 289 db_last_addr = db_dot; 290 have_addr = TRUE; 291 } 292 else { 293 addr = (db_expr_t) db_dot; 294 have_addr = FALSE; 295 } 296 t = db_read_token(); 297 if (t == tCOMMA) { 298 if (!db_expression(&count)) { 299 db_printf("Count missing\n"); 300 db_flush_lex(); 301 return; 302 } 303 } 304 else { 305 db_unread_token(t); 306 count = -1; 307 } 308 if ((cmd->flag & CS_MORE) == 0) { 309 db_skip_to_eol(); 310 } 311 } 312 } 313 *last_cmdp = cmd; 314 last_count = count; 315 if (cmd != 0) { 316 /* 317 * Execute the command. 318 */ 319 (*cmd->fcn)(addr, have_addr, count, modif); 320 321 if (cmd->flag & CS_SET_DOT) { 322 /* 323 * If command changes dot, set dot to 324 * previous address displayed (if 'ed' style). 325 */ 326 if (db_ed_style) { 327 db_dot = db_prev; 328 } 329 else { 330 db_dot = db_next; 331 } 332 } 333 else { 334 /* 335 * If command does not change dot, 336 * set 'next' location to be the same. 337 */ 338 db_next = db_dot; 339 } 340 } 341 } 342 343 /*ARGSUSED*/ 344 void 345 db_map_print_cmd(addr, have_addr, count, modif) 346 db_expr_t addr; 347 int have_addr; 348 db_expr_t count; 349 char * modif; 350 { 351 boolean_t full = FALSE; 352 353 if (modif[0] == 'f') 354 full = TRUE; 355 356 if (have_addr == FALSE) 357 addr = (db_expr_t) kernel_map; 358 359 uvm_map_printit((struct vm_map *) addr, full, db_printf); 360 } 361 362 /*ARGSUSED*/ 363 void 364 db_object_print_cmd(addr, have_addr, count, modif) 365 db_expr_t addr; 366 int have_addr; 367 db_expr_t count; 368 char * modif; 369 { 370 boolean_t full = FALSE; 371 372 if (modif[0] == 'f') 373 full = TRUE; 374 375 uvm_object_printit((struct uvm_object *) addr, full, db_printf); 376 } 377 378 /*ARGSUSED*/ 379 void 380 db_page_print_cmd(addr, have_addr, count, modif) 381 db_expr_t addr; 382 int have_addr; 383 db_expr_t count; 384 char * modif; 385 { 386 boolean_t full = FALSE; 387 388 if (modif[0] == 'f') 389 full = TRUE; 390 391 uvm_page_printit((struct vm_page *) addr, full, db_printf); 392 } 393 394 /*ARGSUSED*/ 395 void 396 db_buf_print_cmd(addr, have_addr, count, modif) 397 db_expr_t addr; 398 int have_addr; 399 db_expr_t count; 400 char * modif; 401 { 402 boolean_t full = FALSE; 403 404 if (modif[0] == 'f') 405 full = TRUE; 406 407 vfs_buf_print((struct buf *)addr, full, db_printf); 408 } 409 410 /*ARGSUSED*/ 411 void 412 db_vnode_print_cmd(addr, have_addr, count, modif) 413 db_expr_t addr; 414 int have_addr; 415 db_expr_t count; 416 char * modif; 417 { 418 boolean_t full = FALSE; 419 420 if (modif[0] == 'f') 421 full = TRUE; 422 423 vfs_vnode_print((struct vnode *)addr, full, db_printf); 424 } 425 426 /*ARGSUSED*/ 427 void 428 db_pool_print_cmd(addr, have_addr, count, modif) 429 db_expr_t addr; 430 int have_addr; 431 db_expr_t count; 432 char * modif; 433 { 434 pool_printit((struct pool *)addr, modif, db_printf); 435 } 436 437 /*ARGSUSED*/ 438 void 439 db_namecache_print_cmd(addr, have_addr, count, modif) 440 db_expr_t addr; 441 int have_addr; 442 db_expr_t count; 443 char * modif; 444 { 445 namecache_print((struct vnode *)addr, db_printf); 446 } 447 448 /*ARGSUSED*/ 449 void 450 db_uvmexp_print_cmd(addr, have_addr, count, modif) 451 db_expr_t addr; 452 int have_addr; 453 db_expr_t count; 454 char * modif; 455 { 456 uvmexp_print(db_printf); 457 } 458 459 /* 460 * 'show' commands 461 */ 462 463 static const struct db_command db_show_all_cmds[] = { 464 { "callout", db_show_callout, 0, NULL }, 465 { "procs", db_show_all_procs, 0, NULL }, 466 { NULL, NULL, 0, NULL } 467 }; 468 469 static const struct db_command db_show_cmds[] = { 470 { "all", NULL, 0, db_show_all_cmds }, 471 #if defined(INET) && (NARP > 0) 472 { "arptab", db_show_arptab, 0, NULL }, 473 #endif 474 { "breaks", db_listbreak_cmd, 0, NULL }, 475 { "buf", db_buf_print_cmd, 0, NULL }, 476 { "map", db_map_print_cmd, 0, NULL }, 477 { "ncache", db_namecache_print_cmd, 0, NULL }, 478 { "object", db_object_print_cmd, 0, NULL }, 479 { "page", db_page_print_cmd, 0, NULL }, 480 { "pool", db_pool_print_cmd, 0, NULL }, 481 { "registers", db_show_regs, 0, NULL }, 482 { "uvmexp", db_uvmexp_print_cmd, 0, NULL }, 483 { "vnode", db_vnode_print_cmd, 0, NULL }, 484 { "watches", db_listwatch_cmd, 0, NULL }, 485 { NULL, NULL, 0, NULL } 486 }; 487 488 static const struct db_command db_command_table[] = { 489 { "break", db_breakpoint_cmd, 0, NULL }, 490 { "c", db_continue_cmd, 0, NULL }, 491 { "call", db_fncall, CS_OWN, NULL }, 492 { "callout", db_show_callout, 0, NULL }, 493 { "continue", db_continue_cmd, 0, NULL }, 494 { "d", db_delete_cmd, 0, NULL }, 495 { "delete", db_delete_cmd, 0, NULL }, 496 { "dwatch", db_deletewatch_cmd, 0, NULL }, 497 { "examine", db_examine_cmd, CS_SET_DOT, NULL }, 498 { "kill", db_kill_proc, CS_OWN, NULL }, 499 #ifdef DB_MACHINE_COMMANDS 500 { "machine", NULL, 0, db_machine_command_table }, 501 #endif 502 { "match", db_trace_until_matching_cmd,0, NULL }, 503 { "next", db_trace_until_matching_cmd,0, NULL }, 504 { "p", db_print_cmd, 0, NULL }, 505 { "print", db_print_cmd, 0, NULL }, 506 { "ps", db_show_all_procs, 0, NULL }, 507 { "reboot", db_reboot_cmd, CS_OWN, NULL }, 508 { "s", db_single_step_cmd, 0, NULL }, 509 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, NULL }, 510 { "set", db_set_cmd, CS_OWN, NULL }, 511 { "show", NULL, 0, db_show_cmds }, 512 { "sifting", db_sifting_cmd, CS_OWN, NULL }, 513 { "step", db_single_step_cmd, 0, NULL }, 514 { "sync", db_sync_cmd, CS_OWN, NULL }, 515 { "trace", db_stack_trace_cmd, 0, NULL }, 516 { "until", db_trace_until_call_cmd,0, NULL }, 517 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, 518 { "watch", db_watchpoint_cmd, CS_MORE, NULL }, 519 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, NULL }, 520 { "x", db_examine_cmd, CS_SET_DOT, NULL }, 521 { NULL, NULL, 0, NULL } 522 }; 523 524 const struct db_command *db_last_command = NULL; 525 526 void 527 db_command_loop() 528 { 529 label_t db_jmpbuf; 530 label_t *savejmp; 531 extern int db_output_line; 532 533 /* 534 * Initialize 'prev' and 'next' to dot. 535 */ 536 db_prev = db_dot; 537 db_next = db_dot; 538 539 db_cmd_loop_done = 0; 540 541 savejmp = db_recover; 542 db_recover = &db_jmpbuf; 543 (void) setjmp(&db_jmpbuf); 544 545 while (!db_cmd_loop_done) { 546 if (db_print_position() != 0) 547 db_printf("\n"); 548 db_output_line = 0; 549 550 551 #ifdef MULTIPROCESSOR 552 db_printf("db{%ld}> ", (long)cpu_number()); 553 #else 554 db_printf("db> "); 555 #endif 556 (void) db_read_line(); 557 558 db_command(&db_last_command, db_command_table); 559 } 560 561 db_recover = savejmp; 562 } 563 564 void 565 db_error(s) 566 char *s; 567 { 568 if (s) 569 db_printf("%s", s); 570 db_flush_lex(); 571 longjmp(db_recover); 572 } 573 574 575 /* 576 * Call random function: 577 * !expr(arg,arg,arg) 578 */ 579 /*ARGSUSED*/ 580 void 581 db_fncall(addr, have_addr, count, modif) 582 db_expr_t addr; 583 int have_addr; 584 db_expr_t count; 585 char * modif; 586 { 587 db_expr_t fn_addr; 588 #define MAXARGS 11 589 db_expr_t args[MAXARGS]; 590 int nargs = 0; 591 db_expr_t retval; 592 db_expr_t (*func) __P((db_expr_t, ...)); 593 int t; 594 595 if (!db_expression(&fn_addr)) { 596 db_printf("Bad function\n"); 597 db_flush_lex(); 598 return; 599 } 600 func = (db_expr_t (*) __P((db_expr_t, ...))) fn_addr; 601 602 t = db_read_token(); 603 if (t == tLPAREN) { 604 if (db_expression(&args[0])) { 605 nargs++; 606 while ((t = db_read_token()) == tCOMMA) { 607 if (nargs == MAXARGS) { 608 db_printf("Too many arguments\n"); 609 db_flush_lex(); 610 return; 611 } 612 if (!db_expression(&args[nargs])) { 613 db_printf("Argument missing\n"); 614 db_flush_lex(); 615 return; 616 } 617 nargs++; 618 } 619 db_unread_token(t); 620 } 621 if (db_read_token() != tRPAREN) { 622 db_printf("?\n"); 623 db_flush_lex(); 624 return; 625 } 626 } 627 db_skip_to_eol(); 628 629 while (nargs < MAXARGS) { 630 args[nargs++] = 0; 631 } 632 633 retval = (*func)(args[0], args[1], args[2], args[3], args[4], 634 args[5], args[6], args[7], args[8], args[9]); 635 db_printf("%s\n", db_num_to_str(retval)); 636 } 637 638 void 639 db_reboot_cmd(addr, have_addr, count, modif) 640 db_expr_t addr; 641 int have_addr; 642 db_expr_t count; 643 char * modif; 644 { 645 db_expr_t bootflags; 646 647 /* Flags, default to RB_AUTOBOOT */ 648 if (!db_expression(&bootflags)) 649 bootflags = (db_expr_t)RB_AUTOBOOT; 650 if (db_read_token() != tEOL) { 651 db_error("?\n"); 652 /*NOTREACHED*/ 653 } 654 /* 655 * We are leaving DDB, never to return upward. 656 * Clear db_recover so that we can debug faults in functions 657 * called from cpu_reboot. 658 */ 659 db_recover = 0; 660 cpu_reboot((int)bootflags, NULL); 661 } 662 663 void 664 db_sifting_cmd(addr, have_addr, count, omodif) 665 db_expr_t addr; 666 int have_addr; 667 db_expr_t count; 668 char * omodif; 669 { 670 int mode, t; 671 672 t = db_read_token(); 673 if (t == tSLASH) { 674 t = db_read_token(); 675 if (t != tIDENT) { 676 bad_modifier: 677 db_printf("Bad modifier\n"); 678 db_flush_lex(); 679 return; 680 } 681 if (!strcmp(db_tok_string, "F")) 682 mode = 'F'; 683 else 684 goto bad_modifier; 685 t = db_read_token(); 686 } else 687 mode = 0; 688 689 if (t == tIDENT) 690 db_sifting(db_tok_string, mode); 691 else { 692 db_printf("Bad argument (non-string)\n"); 693 db_flush_lex(); 694 } 695 } 696 697 void 698 db_stack_trace_cmd(addr, have_addr, count, modif) 699 db_expr_t addr; 700 boolean_t have_addr; 701 db_expr_t count; 702 char *modif; 703 { 704 if (count == -1) 705 count = 65535; 706 707 db_stack_trace_print(addr, have_addr, count, modif, db_printf); 708 } 709 710 void 711 db_sync_cmd(addr, have_addr, count, modif) 712 db_expr_t addr; 713 int have_addr; 714 db_expr_t count; 715 char * modif; 716 { 717 /* 718 * We are leaving DDB, never to return upward. 719 * Clear db_recover so that we can debug faults in functions 720 * called from cpu_reboot. 721 */ 722 db_recover = 0; 723 cpu_reboot(RB_DUMP, NULL); 724 } 725
Indexes created Sun Sep 21 14:09:52 GMT 2025