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sys/ddb/db_command.c
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1 /* $NetBSD: db_command.c,v 1.120.4.2 2009/01/09 03:32:01 snj Exp $ */ 2 /* 3 * Mach Operating System 4 * Copyright (c) 1991,1990 Carnegie Mellon University 5 * All Rights Reserved. 6 * 7 * Permission to use, copy, modify and distribute this software and its 8 * documentation is hereby granted, provided that both the copyright 9 * notice and this permission notice appear in all copies of the 10 * software, derivative works or modified versions, and any portions 11 * thereof, and that both notices appear in supporting documentation. 12 * 13 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 14 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 15 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 16 * 17 * Carnegie Mellon requests users of this software to return to 18 * 19 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 20 * School of Computer Science 21 * Carnegie Mellon University 22 * Pittsburgh PA 15213-3890 23 * 24 * any improvements or extensions that they make and grant Carnegie the 25 * rights to redistribute these changes. 26 */ 27 /* 28 * Copyright (c) 1996, 1997, 1998, 1999, 2002 The NetBSD Foundation, Inc. 29 * All rights reserved. 30 * 31 * This code is derived from software contributed to The NetBSD Foundation 32 * by Adam Hamsik. 33 * 34 * Redistribution and use in source and binary forms, with or without 35 * modification, are permitted provided that the following conditions 36 * are met: 37 * 1. Redistributions of source code must retain the above copyright 38 * notice, this list of conditions and the following disclaimer. 39 * 2. Redistributions in binary form must reproduce the above copyright 40 * notice, this list of conditions and the following disclaimer in the 41 * documentation and/or other materials provided with the distribution. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 44 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 45 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 46 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 47 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 48 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 49 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 50 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 51 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 52 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 53 * POSSIBILITY OF SUCH DAMAGE. 54 */ 55 56 /* 57 * Command dispatcher. 58 */ 59 60 #include <sys/cdefs.h> 61 __KERNEL_RCSID(0, "$NetBSD: db_command.c,v 1.120.4.2 2009/01/09 03:32:01 snj Exp $"); 62 63 #include "opt_ddb.h" 64 #include "opt_kgdb.h" 65 #include "opt_inet.h" 66 #include "opt_uvmhist.h" 67 #include "opt_ddbparam.h" 68 69 #include <sys/param.h> 70 #include <sys/systm.h> 71 #include <sys/reboot.h> 72 #include <sys/device.h> 73 #include <sys/lwp.h> 74 #include <sys/malloc.h> 75 #include <sys/mbuf.h> 76 #include <sys/namei.h> 77 #include <sys/pool.h> 78 #include <sys/proc.h> 79 #include <sys/vnode.h> 80 #include <sys/vmem.h> 81 #include <sys/lockdebug.h> 82 #include <sys/sleepq.h> 83 #include <sys/cpu.h> 84 85 /*include queue macros*/ 86 #include <sys/queue.h> 87 88 #include <machine/db_machdep.h> /* type definitions */ 89 90 #if defined(_KERNEL_OPT) 91 #include "opt_multiprocessor.h" 92 #endif 93 94 #include <ddb/db_lex.h> 95 #include <ddb/db_output.h> 96 #include <ddb/db_command.h> 97 #include <ddb/db_break.h> 98 #include <ddb/db_watch.h> 99 #include <ddb/db_run.h> 100 #include <ddb/db_variables.h> 101 #include <ddb/db_interface.h> 102 #include <ddb/db_sym.h> 103 #include <ddb/db_extern.h> 104 105 #include <uvm/uvm_extern.h> 106 #include <uvm/uvm_ddb.h> 107 108 #include "arp.h" 109 110 /* 111 * Results of command search. 112 */ 113 #define CMD_EXACT 0 114 #define CMD_PREFIX 1 115 #define CMD_NONE 2 116 #define CMD_AMBIGUOUS 3 117 118 /* 119 * Exported global variables 120 */ 121 bool db_cmd_loop_done; 122 label_t *db_recover; 123 db_addr_t db_dot; 124 db_addr_t db_last_addr; 125 db_addr_t db_prev; 126 db_addr_t db_next; 127 128 129 /* 130 * New DDB api for adding and removing commands uses three lists, because 131 * we use two types of commands 132 * a) standard commands without subcommands -> reboot 133 * b) show commands which are subcommands of show command -> show aio_jobs 134 * c) if defined machine specific commands 135 * 136 * ddb_add_cmd, ddb_rem_cmd use type (DDB_SHOW_CMD||DDB_BASE_CMD)argument to 137 * add them to representativ lists. 138 */ 139 140 static const struct db_command db_command_table[]; 141 static const struct db_command db_show_cmds[]; 142 143 #ifdef DB_MACHINE_COMMANDS 144 static const struct db_command db_machine_command_table[]; 145 #endif 146 147 /* the global queue of all command tables */ 148 TAILQ_HEAD(db_cmd_tbl_en_head, db_cmd_tbl_en); 149 150 /* TAILQ entry used to register command tables */ 151 struct db_cmd_tbl_en { 152 const struct db_command *db_cmd; /* cmd table */ 153 TAILQ_ENTRY(db_cmd_tbl_en) db_cmd_next; 154 }; 155 156 /* head of base commands list */ 157 static struct db_cmd_tbl_en_head db_base_cmd_list = 158 TAILQ_HEAD_INITIALIZER(db_base_cmd_list); 159 static struct db_cmd_tbl_en db_base_cmd_builtins = 160 { .db_cmd = db_command_table }; 161 162 /* head of show commands list */ 163 static struct db_cmd_tbl_en_head db_show_cmd_list = 164 TAILQ_HEAD_INITIALIZER(db_show_cmd_list); 165 static struct db_cmd_tbl_en db_show_cmd_builtins = 166 { .db_cmd = db_show_cmds }; 167 168 /* head of machine commands list */ 169 static struct db_cmd_tbl_en_head db_mach_cmd_list = 170 TAILQ_HEAD_INITIALIZER(db_mach_cmd_list); 171 #ifdef DB_MACHINE_COMMANDS 172 static struct db_cmd_tbl_en db_mach_cmd_builtins = 173 { .db_cmd = db_machine_command_table }; 174 #endif 175 176 /* 177 * if 'ed' style: 'dot' is set at start of last item printed, 178 * and '+' points to next line. 179 * Otherwise: 'dot' points to next item, '..' points to last. 180 */ 181 static bool db_ed_style = true; 182 183 static void db_init_commands(void); 184 static int db_register_tbl_entry(uint8_t type, 185 struct db_cmd_tbl_en *list_ent); 186 static void db_cmd_list(const struct db_cmd_tbl_en_head *); 187 static int db_cmd_search(const char *, struct db_cmd_tbl_en_head *, 188 const struct db_command **); 189 static int db_cmd_search_table(const char *, const struct db_command *, 190 const struct db_command **); 191 static void db_cmd_search_failed(char *, int); 192 static const struct db_command *db_read_command(void); 193 static void db_command(const struct db_command **); 194 static void db_buf_print_cmd(db_expr_t, bool, db_expr_t, const char *); 195 static void db_event_print_cmd(db_expr_t, bool, db_expr_t, const char *); 196 static void db_fncall(db_expr_t, bool, db_expr_t, const char *); 197 static void db_help_print_cmd(db_expr_t, bool, db_expr_t, const char *); 198 static void db_lock_print_cmd(db_expr_t, bool, db_expr_t, const char *); 199 static void db_mount_print_cmd(db_expr_t, bool, db_expr_t, const char *); 200 static void db_mbuf_print_cmd(db_expr_t, bool, db_expr_t, const char *); 201 static void db_malloc_print_cmd(db_expr_t, bool, db_expr_t, const char *); 202 static void db_map_print_cmd(db_expr_t, bool, db_expr_t, const char *); 203 static void db_namecache_print_cmd(db_expr_t, bool, db_expr_t, 204 const char *); 205 static void db_object_print_cmd(db_expr_t, bool, db_expr_t, const char *); 206 static void db_page_print_cmd(db_expr_t, bool, db_expr_t, const char *); 207 static void db_show_all_pages(db_expr_t, bool, db_expr_t, const char *); 208 static void db_pool_print_cmd(db_expr_t, bool, db_expr_t, const char *); 209 static void db_reboot_cmd(db_expr_t, bool, db_expr_t, const char *); 210 static void db_sifting_cmd(db_expr_t, bool, db_expr_t, const char *); 211 static void db_stack_trace_cmd(db_expr_t, bool, db_expr_t, const char *); 212 static void db_sync_cmd(db_expr_t, bool, db_expr_t, const char *); 213 static void db_whatis_cmd(db_expr_t, bool, db_expr_t, const char *); 214 static void db_uvmexp_print_cmd(db_expr_t, bool, db_expr_t, const char *); 215 #ifdef UVMHIST 216 static void db_uvmhist_print_cmd(db_expr_t, bool, db_expr_t, const char *); 217 #endif 218 static void db_vnode_print_cmd(db_expr_t, bool, db_expr_t, const char *); 219 220 static const struct db_command db_show_cmds[] = { 221 /*added from all sub cmds*/ 222 { DDB_ADD_CMD("callout", db_show_callout, 223 0 ,"List all used callout functions.",NULL,NULL) }, 224 { DDB_ADD_CMD("pages", db_show_all_pages, 225 0 ,"List all used memory pages.",NULL,NULL) }, 226 { DDB_ADD_CMD("procs", db_show_all_procs, 227 0 ,"List all processes.",NULL,NULL) }, 228 { DDB_ADD_CMD("pools", db_show_all_pools, 229 0 ,"Show all poolS",NULL,NULL) }, 230 /*added from all sub cmds*/ 231 { DDB_ADD_CMD("aio_jobs", db_show_aio_jobs, 0, 232 "Show aio jobs",NULL,NULL) }, 233 { DDB_ADD_CMD("all", NULL, 234 CS_COMPAT, NULL,NULL,NULL) }, 235 #if defined(INET) && (NARP > 0) 236 { DDB_ADD_CMD("arptab", db_show_arptab, 0,NULL,NULL,NULL) }, 237 #endif 238 { DDB_ADD_CMD("breaks", db_listbreak_cmd, 0, 239 "Display all breaks.",NULL,NULL) }, 240 { DDB_ADD_CMD("buf", db_buf_print_cmd, 0, 241 "Print the struct buf at address.", "[/f] address",NULL) }, 242 { DDB_ADD_CMD("event", db_event_print_cmd, 0, 243 "Print all the non-zero evcnt(9) event counters.", "[/f]",NULL) }, 244 { DDB_ADD_CMD("files", db_show_files_cmd, 0, 245 "Print the files open by process at address", 246 "[/f] address", NULL) }, 247 { DDB_ADD_CMD("lock", db_lock_print_cmd, 0,NULL,NULL,NULL) }, 248 { DDB_ADD_CMD("malloc", db_malloc_print_cmd,0,NULL,NULL,NULL) }, 249 { DDB_ADD_CMD("map", db_map_print_cmd, 0, 250 "Print the vm_map at address.", "[/f] address",NULL) }, 251 { DDB_ADD_CMD("mount", db_mount_print_cmd, 0, 252 "Print the mount structure at address.", "[/f] address",NULL) }, 253 { DDB_ADD_CMD("mqueue", db_show_mqueue_cmd, 0, 254 "Print the message queues", NULL, NULL) }, 255 { DDB_ADD_CMD("mbuf", db_mbuf_print_cmd, 0,NULL,NULL, 256 "-c prints all mbuf chains") }, 257 { DDB_ADD_CMD("ncache", db_namecache_print_cmd, 0, 258 "Dump the namecache list.", "address",NULL) }, 259 { DDB_ADD_CMD("object", db_object_print_cmd, 0, 260 "Print the vm_object at address.", "[/f] address",NULL) }, 261 { DDB_ADD_CMD("page", db_page_print_cmd, 0, 262 "Print the vm_page at address.", "[/f] address",NULL) }, 263 { DDB_ADD_CMD("pool", db_pool_print_cmd, 0, 264 "Print the pool at address.", "[/clp] address",NULL) }, 265 { DDB_ADD_CMD("registers", db_show_regs, 0, 266 "Display the register set.", "[/u]",NULL) }, 267 { DDB_ADD_CMD("sched_qs", db_show_sched_qs, 0, 268 "Print the state of the scheduler's run queues.", 269 NULL,NULL) }, 270 { DDB_ADD_CMD("uvmexp", db_uvmexp_print_cmd, 0, 271 "Print a selection of UVM counters and statistics.", 272 NULL,NULL) }, 273 #ifdef UVMHIST 274 { DDB_ADD_CMD("uvmhist", db_uvmhist_print_cmd, 0, 275 "Print the UVM history logs.", 276 NULL,NULL) }, 277 #endif 278 { DDB_ADD_CMD("vnode", db_vnode_print_cmd, 0, 279 "Print the vnode at address.", "[/f] address",NULL) }, 280 { DDB_ADD_CMD("watches", db_listwatch_cmd, 0, 281 "Display all watchpoints.", NULL,NULL) }, 282 { DDB_ADD_CMD(NULL, NULL, 0,NULL,NULL,NULL) } 283 }; 284 285 /* arch/<arch>/<arch>/db_interface.c */ 286 #ifdef DB_MACHINE_COMMANDS 287 extern const struct db_command db_machine_command_table[]; 288 #endif 289 290 static const struct db_command db_command_table[] = { 291 { DDB_ADD_CMD("b", db_breakpoint_cmd, 0, 292 "Set a breakpoint at address", "[/u] address[,count].",NULL) }, 293 { DDB_ADD_CMD("break", db_breakpoint_cmd, 0, 294 "Set a breakpoint at address", "[/u] address[,count].",NULL) }, 295 { DDB_ADD_CMD("bt", db_stack_trace_cmd, 0, 296 "Show backtrace.", "See help trace.",NULL) }, 297 { DDB_ADD_CMD("c", db_continue_cmd, 0, 298 "Continue execution.", "[/c]",NULL) }, 299 { DDB_ADD_CMD("call", db_fncall, CS_OWN, 300 "Call the function", "address[(expression[,...])]",NULL) }, 301 { DDB_ADD_CMD("callout", db_show_callout, 0, NULL, 302 NULL,NULL ) }, 303 { DDB_ADD_CMD("continue", db_continue_cmd, 0, 304 "Continue execution.", "[/c]",NULL) }, 305 { DDB_ADD_CMD("d", db_delete_cmd, 0, 306 "Delete a breakpoint.", "address | #number",NULL) }, 307 { DDB_ADD_CMD("delete", db_delete_cmd, 0, 308 "Delete a breakpoint.", "address | #number",NULL) }, 309 { DDB_ADD_CMD("dmesg", db_dmesg, 0, 310 "Show kernel message buffer.", "[count]",NULL) }, 311 { DDB_ADD_CMD("dwatch", db_deletewatch_cmd, 0, 312 "Delete the watchpoint.", "address",NULL) }, 313 { DDB_ADD_CMD("examine", db_examine_cmd, CS_SET_DOT, 314 "Display the address locations.", 315 "[/modifier] address[,count]",NULL) }, 316 { DDB_ADD_CMD("help", db_help_print_cmd, CS_OWN|CS_NOREPEAT, 317 "Display help about commands", 318 "Use other commands as arguments.",NULL) }, 319 { DDB_ADD_CMD("kill", db_kill_proc, CS_OWN, 320 "Send a signal to the process","pid[,signal_number]", 321 " pid:\t\t\tthe process id (may need 0t prefix for decimal)\n" 322 " signal_number:\tthe signal to send") }, 323 #ifdef KGDB 324 { DDB_ADD_CMD("kgdb", db_kgdb_cmd, 0, NULL,NULL,NULL) }, 325 #endif 326 { DDB_ADD_CMD("machine",NULL,CS_MACH, 327 "Architecture specific functions.",NULL,NULL) }, 328 { DDB_ADD_CMD("match", db_trace_until_matching_cmd,0, 329 "Stop at the matching return instruction.","See help next",NULL) }, 330 { DDB_ADD_CMD("next", db_trace_until_matching_cmd,0, 331 "Stop at the matching return instruction.","[/p]",NULL) }, 332 { DDB_ADD_CMD("p", db_print_cmd, 0, 333 "Print address according to the format.", 334 "[/axzodurc] address [address ...]",NULL) }, 335 { DDB_ADD_CMD("print", db_print_cmd, 0, 336 "Print address according to the format.", 337 "[/axzodurc] address [address ...]",NULL) }, 338 { DDB_ADD_CMD("ps", db_show_all_procs, 0, 339 "Print all processes.","See show all procs",NULL) }, 340 { DDB_ADD_CMD("reboot", db_reboot_cmd, CS_OWN, 341 "Reboot","0x1 RB_ASKNAME, 0x2 RB_SINGLE, 0x4 RB_NOSYNC, 0x8 RB_HALT," 342 "0x40 RB_KDB, 0x100 RB_DUMP, 0x808 RB_POWERDOWN",NULL) }, 343 { DDB_ADD_CMD("s", db_single_step_cmd, 0, 344 "Single-step count times.","[/p] [,count]",NULL) }, 345 { DDB_ADD_CMD("search", db_search_cmd, CS_OWN|CS_SET_DOT, 346 "Search memory from address for value.", 347 "[/bhl] address value [mask] [,count]",NULL) }, 348 { DDB_ADD_CMD("set", db_set_cmd, CS_OWN, 349 "Set the named variable","$variable [=] expression",NULL) }, 350 { DDB_ADD_CMD("show", NULL, CS_SHOW, 351 "Show kernel stats.", NULL,NULL) }, 352 { DDB_ADD_CMD("sifting", db_sifting_cmd, CS_OWN, 353 "Search the symbol tables ","[/F] string",NULL) }, 354 { DDB_ADD_CMD("step", db_single_step_cmd, 0, 355 "Single-step count times.","[/p] [,count]",NULL) }, 356 { DDB_ADD_CMD("sync", db_sync_cmd, CS_OWN, 357 "Force a crash dump, and then reboot.",NULL,NULL) }, 358 { DDB_ADD_CMD("trace", db_stack_trace_cmd, 0, 359 "Stack trace from frame-address.", 360 "[/u[l]] [frame-address][,count]",NULL) }, 361 { DDB_ADD_CMD("until", db_trace_until_call_cmd,0, 362 "Stop at the next call or return instruction.","[/p]",NULL) }, 363 { DDB_ADD_CMD("w", db_write_cmd, CS_MORE|CS_SET_DOT, 364 "Write the expressions at succeeding locations.", 365 "[/bhl] address expression [expression ...]",NULL) }, 366 { DDB_ADD_CMD("watch", db_watchpoint_cmd, CS_MORE, 367 "Set a watchpoint for a region. ","address[,size]",NULL) }, 368 { DDB_ADD_CMD("whatis", db_whatis_cmd, 0, 369 "Describe what an address is", "address", NULL) }, 370 { DDB_ADD_CMD("write", db_write_cmd, CS_MORE|CS_SET_DOT, 371 "Write the expressions at succeeding locations.", 372 "[/bhl] address expression [expression ...]",NULL) }, 373 { DDB_ADD_CMD("x", db_examine_cmd, CS_SET_DOT, 374 "Display the address locations.", 375 "[/modifier] address[,count]",NULL) }, 376 { DDB_ADD_CMD(NULL, NULL, 0, NULL, NULL, NULL) } 377 }; 378 379 static const struct db_command *db_last_command = NULL; 380 #if defined(DDB_COMMANDONENTER) 381 char db_cmd_on_enter[DB_LINE_MAXLEN + 1] = ___STRING(DDB_COMMANDONENTER); 382 #else /* defined(DDB_COMMANDONENTER) */ 383 char db_cmd_on_enter[DB_LINE_MAXLEN + 1] = ""; 384 #endif /* defined(DDB_COMMANDONENTER) */ 385 #define DB_LINE_SEP ';' 386 387 /* 388 * Utility routine - discard tokens through end-of-line. 389 */ 390 void 391 db_skip_to_eol(void) 392 { 393 int t; 394 395 do { 396 t = db_read_token(); 397 } while (t != tEOL); 398 } 399 400 void 401 db_error(const char *s) 402 { 403 404 if (s) 405 db_printf("%s", s); 406 db_flush_lex(); 407 longjmp(db_recover); 408 } 409 410 /* 411 * Execute commandlist after ddb start 412 * This function goes through the command list created from commands and ';' 413 */ 414 static void 415 db_execute_commandlist(const char *cmdlist) 416 { 417 const char *cmd = cmdlist; 418 const struct db_command *dummy = NULL; 419 420 while (*cmd != '\0') { 421 const char *ep = cmd; 422 423 while (*ep != '\0' && *ep != DB_LINE_SEP) { 424 ep++; 425 } 426 db_set_line(cmd, ep); 427 db_command(&dummy); 428 cmd = ep; 429 if (*cmd == DB_LINE_SEP) { 430 cmd++; 431 } 432 } 433 } 434 435 /* Initialize ddb command tables */ 436 void 437 db_init_commands(void) 438 { 439 static bool done = false; 440 441 if (done) return; 442 done = true; 443 444 /* register command tables */ 445 (void)db_register_tbl_entry(DDB_BASE_CMD, &db_base_cmd_builtins); 446 #ifdef DB_MACHINE_COMMANDS 447 (void)db_register_tbl_entry(DDB_MACH_CMD, &db_mach_cmd_builtins); 448 #endif 449 (void)db_register_tbl_entry(DDB_SHOW_CMD, &db_show_cmd_builtins); 450 } 451 452 453 /* 454 * Add command table to the specified list 455 * Arg: 456 * int type specifies type of command table DDB_SHOW_CMD|DDB_BASE_CMD|DDB_MAC_CMD 457 * *cmd_tbl poiter to static allocated db_command table 458 * 459 * Command table must be NULL terminated array of struct db_command 460 */ 461 int 462 db_register_tbl(uint8_t type, const struct db_command *cmd_tbl) 463 { 464 struct db_cmd_tbl_en *list_ent; 465 466 /* empty list - ignore */ 467 if (cmd_tbl->name == 0) 468 return 0; 469 470 /* force builtin commands to be registered first */ 471 db_init_commands(); 472 473 /* now create a list entry for this table */ 474 list_ent = malloc(sizeof(struct db_cmd_tbl_en), M_TEMP, M_ZERO); 475 if (list_ent == NULL) 476 return ENOMEM; 477 list_ent->db_cmd=cmd_tbl; 478 479 /* and register it */ 480 return db_register_tbl_entry(type, list_ent); 481 } 482 483 static int 484 db_register_tbl_entry(uint8_t type, struct db_cmd_tbl_en *list_ent) 485 { 486 struct db_cmd_tbl_en_head *list; 487 488 switch(type) { 489 case DDB_BASE_CMD: 490 list = &db_base_cmd_list; 491 break; 492 case DDB_SHOW_CMD: 493 list = &db_show_cmd_list; 494 break; 495 case DDB_MACH_CMD: 496 list = &db_mach_cmd_list; 497 break; 498 default: 499 return ENOENT; 500 } 501 502 TAILQ_INSERT_TAIL(list, list_ent, db_cmd_next); 503 504 return 0; 505 } 506 507 /* 508 * Remove command table specified with db_cmd address == cmd_tbl 509 */ 510 int 511 db_unregister_tbl(uint8_t type,const struct db_command *cmd_tbl) 512 { 513 struct db_cmd_tbl_en *list_ent; 514 struct db_cmd_tbl_en_head *list; 515 516 /* find list on which the entry should live */ 517 switch (type) { 518 case DDB_BASE_CMD: 519 list=&db_base_cmd_list; 520 break; 521 case DDB_SHOW_CMD: 522 list=&db_show_cmd_list; 523 break; 524 case DDB_MACH_CMD: 525 list=&db_mach_cmd_list; 526 break; 527 default: 528 return EINVAL; 529 } 530 531 TAILQ_FOREACH (list_ent, list, db_cmd_next) { 532 if (list_ent->db_cmd == cmd_tbl){ 533 TAILQ_REMOVE(list, 534 list_ent, db_cmd_next); 535 free(list_ent,M_TEMP); 536 return 0; 537 } 538 } 539 return ENOENT; 540 } 541 542 /* This function is called from machine trap code. */ 543 void 544 db_command_loop(void) 545 { 546 label_t db_jmpbuf; 547 label_t *savejmp; 548 549 /* 550 * Initialize 'prev' and 'next' to dot. 551 */ 552 db_prev = db_dot; 553 db_next = db_dot; 554 555 db_cmd_loop_done = false; 556 557 /* Init default command tables add machine, base, 558 show command tables to the list */ 559 db_init_commands(); 560 561 /* save context for return from ddb */ 562 savejmp = db_recover; 563 db_recover = &db_jmpbuf; 564 (void) setjmp(&db_jmpbuf); 565 566 /* Execute default ddb start commands */ 567 db_execute_commandlist(db_cmd_on_enter); 568 569 (void) setjmp(&db_jmpbuf); 570 while (!db_cmd_loop_done) { 571 if (db_print_position() != 0) 572 db_printf("\n"); 573 db_output_line = 0; 574 575 576 #ifdef MULTIPROCESSOR 577 db_printf("db{%ld}> ", (long)cpu_number()); 578 #else 579 db_printf("db> "); 580 #endif 581 (void) db_read_line(); 582 583 db_command(&db_last_command); 584 } 585 586 db_recover = savejmp; 587 } 588 589 /* 590 * Search command table for command prefix 591 */ 592 static int 593 db_cmd_search_table(const char *name, 594 const struct db_command *table, 595 const struct db_command **cmdp) 596 { 597 598 const struct db_command *cmd; 599 int result; 600 601 result = CMD_NONE; 602 *cmdp = NULL; 603 604 for (cmd = table; cmd->name != 0; cmd++) { 605 const char *lp; 606 const char *rp; 607 608 lp = name; 609 rp = cmd->name; 610 while (*lp != '\0' && *lp == *rp) { 611 rp++; 612 lp++; 613 } 614 615 if (*lp != '\0') /* mismatch or extra chars in name */ 616 continue; 617 618 if (*rp == '\0') { /* exact match */ 619 *cmdp = cmd; 620 return (CMD_EXACT); 621 } 622 623 /* prefix match: end of name, not end of command */ 624 if (result == CMD_NONE) { 625 result = CMD_PREFIX; 626 *cmdp = cmd; 627 } 628 else if (result == CMD_PREFIX) { 629 result = CMD_AMBIGUOUS; 630 *cmdp = NULL; 631 } 632 } 633 634 return (result); 635 } 636 637 638 /* 639 * Search list of command tables for command 640 */ 641 static int 642 db_cmd_search(const char *name, 643 struct db_cmd_tbl_en_head *list_head, 644 const struct db_command **cmdp) 645 { 646 struct db_cmd_tbl_en *list_ent; 647 const struct db_command *found_command; 648 bool accept_prefix_match; 649 int result; 650 651 result = CMD_NONE; 652 found_command = NULL; 653 accept_prefix_match = true; 654 655 TAILQ_FOREACH(list_ent, list_head, db_cmd_next) { 656 const struct db_command *cmd; 657 int found; 658 659 found = db_cmd_search_table(name, list_ent->db_cmd, &cmd); 660 if (found == CMD_EXACT) { 661 result = CMD_EXACT; 662 found_command = cmd; 663 break; 664 } 665 666 if (found == CMD_PREFIX) { 667 if (accept_prefix_match) { 668 /* 669 * Continue search, but note current result 670 * in case we won't find anything else. 671 */ 672 accept_prefix_match = false; 673 result = CMD_PREFIX; 674 found_command = cmd; 675 } else { 676 /* 677 * Watch out for globally ambiguous 678 * prefix match that is not locally 679 * ambiguous - with one match in one 680 * table and another match(es) in 681 * another table. 682 */ 683 result = CMD_AMBIGUOUS; 684 found_command = NULL; 685 } 686 } 687 else if (found == CMD_AMBIGUOUS) { 688 accept_prefix_match = false; 689 result = CMD_AMBIGUOUS; 690 found_command = NULL; 691 } 692 } 693 694 *cmdp = found_command; 695 return result; 696 } 697 698 static void 699 db_cmd_search_failed(char *name, int search_result) 700 { 701 if (search_result == CMD_NONE) 702 db_printf("No such command: %s\n", name); 703 else 704 db_printf("Ambiguous command: %s\n", name); 705 } 706 707 708 /* 709 * List commands to the console. 710 */ 711 static void 712 db_cmd_list(const struct db_cmd_tbl_en_head *list) 713 { 714 715 struct db_cmd_tbl_en *list_ent; 716 const struct db_command *table; 717 size_t i, j, w, columns, lines, numcmds, width=0; 718 const char *p; 719 720 TAILQ_FOREACH(list_ent,list,db_cmd_next) { 721 table = list_ent->db_cmd; 722 for (i = 0; table[i].name != NULL; i++) { 723 w = strlen(table[i].name); 724 if (w > width) 725 width = w; 726 } 727 } 728 729 width = DB_NEXT_TAB(width); 730 731 columns = db_max_width / width; 732 if (columns == 0) 733 columns = 1; 734 735 TAILQ_FOREACH(list_ent,list,db_cmd_next) { 736 table = list_ent->db_cmd; 737 738 for (numcmds = 0; table[numcmds].name != NULL; numcmds++) 739 ; 740 lines = (numcmds + columns - 1) / columns; 741 742 for (i = 0; i < lines; i++) { 743 for (j = 0; j < columns; j++) { 744 p = table[j * lines + i].name; 745 if (p) 746 db_printf("%s", p); 747 if (j * lines + i + lines >= numcmds) { 748 db_putchar('\n'); 749 break; 750 } 751 if (p) { 752 w = strlen(p); 753 while (w < width) { 754 w = DB_NEXT_TAB(w); 755 db_putchar('\t'); 756 } 757 } 758 } 759 } 760 } 761 return; 762 } 763 764 /* 765 * Read complete command with all subcommands, starting with current 766 * db_tok_string. If subcommand is missing, print the list of all 767 * subcommands. If command/subcommand is not found, print an error 768 * message. Returns pointer to "leaf" command or NULL. 769 */ 770 static const struct db_command * 771 db_read_command(void) 772 { 773 const struct db_command *command; 774 struct db_cmd_tbl_en_head *list; 775 int found; 776 int t; 777 778 list = &db_base_cmd_list; 779 do { 780 found = db_cmd_search(db_tok_string, list, &command); 781 if (command == NULL) { 782 db_cmd_search_failed(db_tok_string, found); 783 db_flush_lex(); 784 return NULL; 785 } 786 787 if (command->flag == CS_SHOW) 788 list = &db_show_cmd_list; 789 else if (command->flag == CS_MACH) 790 list = &db_mach_cmd_list; 791 else if (command->flag == CS_COMPAT) 792 /* same list */; 793 else 794 break; /* expect no more subcommands */ 795 796 t = db_read_token(); /* read subcommand */ 797 if (t != tIDENT) { 798 /* if none given - just print all of them */ 799 db_cmd_list(list); 800 db_flush_lex(); 801 return NULL; 802 } 803 } while (list != NULL); 804 805 return command; 806 } 807 808 /* 809 * Parse command line and execute apropriate function. 810 */ 811 static void 812 db_command(const struct db_command **last_cmdp) 813 { 814 const struct db_command *command; 815 static db_expr_t last_count; 816 db_expr_t addr, count; 817 char modif[TOK_STRING_SIZE]; 818 819 int t; 820 bool have_addr = false; 821 822 command = NULL; 823 last_count = 0; 824 825 t = db_read_token(); 826 if ((t == tEOL) || (t == tCOMMA)) { 827 /* 828 * An empty line repeats last command, at 'next'. 829 * Only a count repeats the last command with the new count. 830 */ 831 command = *last_cmdp; 832 833 if (!command) 834 return; 835 836 addr = (db_expr_t)db_next; 837 if (t == tCOMMA) { 838 if (!db_expression(&count)) { 839 db_printf("Count missing\n"); 840 db_flush_lex(); 841 return; 842 } 843 } else 844 count = last_count; 845 have_addr = false; 846 modif[0] = '\0'; 847 db_skip_to_eol(); 848 849 } else if (t == tEXCL) { 850 db_fncall(0, 0, 0, NULL); 851 return; 852 853 } else if (t != tIDENT) { 854 db_printf("?\n"); 855 db_flush_lex(); 856 return; 857 858 } else { 859 860 command = db_read_command(); 861 if (command == NULL) 862 return; 863 864 if ((command->flag & CS_OWN) == 0) { 865 866 /* 867 * Standard syntax: 868 * command [/modifier] [addr] [,count] 869 */ 870 t = db_read_token(); /* get modifier */ 871 if (t == tSLASH) { 872 t = db_read_token(); 873 if (t != tIDENT) { 874 db_printf("Bad modifier\n"); 875 db_flush_lex(); 876 return; 877 } 878 /* save modifier */ 879 strlcpy(modif, db_tok_string, sizeof(modif)); 880 881 } else { 882 db_unread_token(t); 883 modif[0] = '\0'; 884 } 885 886 if (db_expression(&addr)) { /*get address*/ 887 db_dot = (db_addr_t) addr; 888 db_last_addr = db_dot; 889 have_addr = true; 890 } else { 891 addr = (db_expr_t) db_dot; 892 have_addr = false; 893 } 894 895 t = db_read_token(); 896 if (t == tCOMMA) { /*Get count*/ 897 if (!db_expression(&count)) { 898 db_printf("Count missing\n"); 899 db_flush_lex(); 900 return; 901 } 902 } else { 903 db_unread_token(t); 904 count = -1; 905 } 906 if ((command->flag & CS_MORE) == 0) { 907 db_skip_to_eol(); 908 } 909 } 910 } 911 912 if (command != NULL && command->flag & CS_NOREPEAT) { 913 *last_cmdp = NULL; 914 last_count = 0; 915 } else { 916 *last_cmdp = command; 917 last_count = count; 918 } 919 920 921 if (command != NULL) { 922 /* 923 * Execute the command. 924 */ 925 if (command->fcn != NULL) 926 (*command->fcn)(addr, have_addr, count, modif); 927 928 if (command->flag & CS_SET_DOT) { 929 /* 930 * If command changes dot, set dot to 931 * previous address displayed (if 'ed' style). 932 */ 933 if (db_ed_style) 934 db_dot = db_prev; 935 else 936 db_dot = db_next; 937 } else { 938 /* 939 * If command does not change dot, 940 * set 'next' location to be the same. 941 */ 942 db_next = db_dot; 943 } 944 } 945 } 946 947 /* 948 * Print help for commands 949 */ 950 static void 951 db_help_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, 952 const char *modif) 953 { 954 const struct db_command *command; 955 int t; 956 957 t = db_read_token(); 958 959 /* is there another command after the "help"? */ 960 if (t != tIDENT) { 961 /* print base commands */ 962 db_cmd_list(&db_base_cmd_list); 963 return; 964 } 965 966 command = db_read_command(); 967 if (command == NULL) 968 return; 969 970 #ifdef DDB_VERBOSE_HELP 971 db_printf("Command: %s\n", command->name); 972 if (command->cmd_descr != NULL) 973 db_printf(" Description: %s\n", command->cmd_descr); 974 if (command->cmd_arg != NULL) 975 db_printf(" Arguments: %s\n", command->cmd_arg); 976 if (command->cmd_arg_help != NULL) 977 db_printf(" Arguments description:\n%s\n", 978 command->cmd_arg_help); 979 if ((command->cmd_arg == NULL) && (command->cmd_descr == NULL)) 980 db_printf(" No help message.\n"); 981 #endif 982 983 db_skip_to_eol(); 984 } 985 986 /*ARGSUSED*/ 987 static void 988 db_map_print_cmd(db_expr_t addr, bool have_addr, db_expr_t count, 989 const char *modif) 990 { 991 bool full = false; 992 993 if (modif[0] == 'f') 994 full = true; 995 996 if (have_addr == false) 997 addr = (db_expr_t)(uintptr_t) kernel_map; 998 999 uvm_map_printit((struct vm_map *)(uintptr_t) addr, full, db_printf); 1000 } 1001 1002 /*ARGSUSED*/ 1003 static void 1004 db_malloc_print_cmd(db_expr_t addr, bool have_addr, 1005 db_expr_t count, const char *modif) 1006 { 1007 1008 #ifdef MALLOC_DEBUG 1009 if (!have_addr) 1010 addr = 0; 1011 1012 debug_malloc_printit(db_printf, (vaddr_t) addr); 1013 #else 1014 db_printf("The kernel is not built with the MALLOC_DEBUG option.\n"); 1015 #endif /* MALLOC_DEBUG */ 1016 } 1017 1018 /*ARGSUSED*/ 1019 static void 1020 db_object_print_cmd(db_expr_t addr, bool have_addr, 1021 db_expr_t count, const char *modif) 1022 { 1023 bool full = false; 1024 1025 if (modif[0] == 'f') 1026 full = true; 1027 1028 uvm_object_printit((struct uvm_object *)(uintptr_t) addr, full, 1029 db_printf); 1030 } 1031 1032 /*ARGSUSED*/ 1033 static void 1034 db_page_print_cmd(db_expr_t addr, bool have_addr, 1035 db_expr_t count, const char *modif) 1036 { 1037 bool full = false; 1038 1039 if (modif[0] == 'f') 1040 full = true; 1041 1042 uvm_page_printit((struct vm_page *)(uintptr_t) addr, full, db_printf); 1043 } 1044 1045 /*ARGSUSED*/ 1046 static void 1047 db_show_all_pages(db_expr_t addr, bool have_addr, 1048 db_expr_t count, const char *modif) 1049 { 1050 1051 uvm_page_printall(db_printf); 1052 } 1053 1054 /*ARGSUSED*/ 1055 static void 1056 db_buf_print_cmd(db_expr_t addr, bool have_addr, 1057 db_expr_t count, const char *modif) 1058 { 1059 bool full = false; 1060 1061 if (modif[0] == 'f') 1062 full = true; 1063 1064 vfs_buf_print((struct buf *)(uintptr_t) addr, full, db_printf); 1065 } 1066 1067 /*ARGSUSED*/ 1068 static void 1069 db_event_print_cmd(db_expr_t addr, bool have_addr, 1070 db_expr_t count, const char *modif) 1071 { 1072 bool full = false; 1073 1074 if (modif[0] == 'f') 1075 full = true; 1076 1077 event_print(full, db_printf); 1078 } 1079 1080 /*ARGSUSED*/ 1081 static void 1082 db_vnode_print_cmd(db_expr_t addr, bool have_addr, 1083 db_expr_t count, const char *modif) 1084 { 1085 bool full = false; 1086 1087 if (modif[0] == 'f') 1088 full = true; 1089 1090 vfs_vnode_print((struct vnode *)(uintptr_t) addr, full, db_printf); 1091 } 1092 1093 static void 1094 db_mount_print_cmd(db_expr_t addr, bool have_addr, 1095 db_expr_t count, const char *modif) 1096 { 1097 bool full = false; 1098 1099 if (modif[0] == 'f') 1100 full = true; 1101 1102 vfs_mount_print((struct mount *)(uintptr_t) addr, full, db_printf); 1103 } 1104 1105 /*ARGSUSED*/ 1106 static void 1107 db_mbuf_print_cmd(db_expr_t addr, bool have_addr, 1108 db_expr_t count, const char *modif) 1109 { 1110 1111 m_print((const struct mbuf *)(uintptr_t) addr, modif, db_printf); 1112 } 1113 1114 /*ARGSUSED*/ 1115 static void 1116 db_pool_print_cmd(db_expr_t addr, bool have_addr, 1117 db_expr_t count, const char *modif) 1118 { 1119 1120 pool_printit((struct pool *)(uintptr_t) addr, modif, db_printf); 1121 } 1122 1123 /*ARGSUSED*/ 1124 static void 1125 db_namecache_print_cmd(db_expr_t addr, bool have_addr, 1126 db_expr_t count, const char *modif) 1127 { 1128 1129 namecache_print((struct vnode *)(uintptr_t) addr, db_printf); 1130 } 1131 1132 /*ARGSUSED*/ 1133 static void 1134 db_uvmexp_print_cmd(db_expr_t addr, bool have_addr, 1135 db_expr_t count, const char *modif) 1136 { 1137 1138 uvmexp_print(db_printf); 1139 } 1140 1141 #ifdef UVMHIST 1142 /*ARGSUSED*/ 1143 static void 1144 db_uvmhist_print_cmd(db_expr_t addr, bool have_addr, 1145 db_expr_t count, const char *modif) 1146 { 1147 1148 uvmhist_print(db_printf); 1149 } 1150 #endif 1151 1152 /*ARGSUSED*/ 1153 static void 1154 db_lock_print_cmd(db_expr_t addr, bool have_addr, 1155 db_expr_t count, const char *modif) 1156 { 1157 1158 lockdebug_lock_print((void *)(uintptr_t)addr, db_printf); 1159 } 1160 1161 /* 1162 * Call random function: 1163 * !expr(arg,arg,arg) 1164 */ 1165 /*ARGSUSED*/ 1166 static void 1167 db_fncall(db_expr_t addr, bool have_addr, 1168 db_expr_t count, const char *modif) 1169 { 1170 db_expr_t fn_addr; 1171 #define MAXARGS 11 1172 db_expr_t args[MAXARGS]; 1173 int nargs = 0; 1174 db_expr_t retval; 1175 db_expr_t (*func)(db_expr_t, ...); 1176 int t; 1177 1178 if (!db_expression(&fn_addr)) { 1179 db_printf("Bad function\n"); 1180 db_flush_lex(); 1181 return; 1182 } 1183 func = (db_expr_t (*)(db_expr_t, ...))(uintptr_t) fn_addr; 1184 1185 t = db_read_token(); 1186 if (t == tLPAREN) { 1187 if (db_expression(&args[0])) { 1188 nargs++; 1189 while ((t = db_read_token()) == tCOMMA) { 1190 if (nargs == MAXARGS) { 1191 db_printf("Too many arguments\n"); 1192 db_flush_lex(); 1193 return; 1194 } 1195 if (!db_expression(&args[nargs])) { 1196 db_printf("Argument missing\n"); 1197 db_flush_lex(); 1198 return; 1199 } 1200 nargs++; 1201 } 1202 db_unread_token(t); 1203 } 1204 if (db_read_token() != tRPAREN) { 1205 db_printf("?\n"); 1206 db_flush_lex(); 1207 return; 1208 } 1209 } 1210 db_skip_to_eol(); 1211 1212 while (nargs < MAXARGS) { 1213 args[nargs++] = 0; 1214 } 1215 1216 retval = (*func)(args[0], args[1], args[2], args[3], args[4], 1217 args[5], args[6], args[7], args[8], args[9]); 1218 db_printf("%s\n", db_num_to_str(retval)); 1219 } 1220 1221 static void 1222 db_reboot_cmd(db_expr_t addr, bool have_addr, 1223 db_expr_t count, const char *modif) 1224 { 1225 db_expr_t bootflags; 1226 1227 /* Flags, default to RB_AUTOBOOT */ 1228 if (!db_expression(&bootflags)) 1229 bootflags = (db_expr_t)RB_AUTOBOOT; 1230 if (db_read_token() != tEOL) { 1231 db_error("?\n"); 1232 /*NOTREACHED*/ 1233 } 1234 /* 1235 * We are leaving DDB, never to return upward. 1236 * Clear db_recover so that we can debug faults in functions 1237 * called from cpu_reboot. 1238 */ 1239 db_recover = 0; 1240 cpu_reboot((int)bootflags, NULL); 1241 } 1242 1243 static void 1244 db_sifting_cmd(db_expr_t addr, bool have_addr, 1245 db_expr_t count, const char *modif) 1246 { 1247 int mode, t; 1248 1249 t = db_read_token(); 1250 if (t == tSLASH) { 1251 t = db_read_token(); 1252 if (t != tIDENT) { 1253 bad_modifier: 1254 db_printf("Bad modifier\n"); 1255 db_flush_lex(); 1256 return; 1257 } 1258 if (!strcmp(db_tok_string, "F")) 1259 mode = 'F'; 1260 else 1261 goto bad_modifier; 1262 t = db_read_token(); 1263 } else 1264 mode = 0; 1265 1266 if (t == tIDENT) 1267 db_sifting(db_tok_string, mode); 1268 else { 1269 db_printf("Bad argument (non-string)\n"); 1270 db_flush_lex(); 1271 } 1272 } 1273 1274 static void 1275 db_stack_trace_cmd(db_expr_t addr, bool have_addr, db_expr_t count, const char *modif) 1276 { 1277 register const char *cp = modif; 1278 register char c; 1279 void (*pr)(const char *, ...); 1280 1281 pr = db_printf; 1282 while ((c = *cp++) != 0) 1283 if (c == 'l') 1284 pr = printf; 1285 1286 if (count == -1) 1287 count = 65535; 1288 1289 db_stack_trace_print(addr, have_addr, count, modif, pr); 1290 } 1291 1292 static void 1293 db_sync_cmd(db_expr_t addr, bool have_addr, 1294 db_expr_t count, const char *modif) 1295 { 1296 1297 /* 1298 * We are leaving DDB, never to return upward. 1299 * Clear db_recover so that we can debug faults in functions 1300 * called from cpu_reboot. 1301 */ 1302 db_recover = 0; 1303 panicstr = "dump forced via kernel debugger"; 1304 cpu_reboot(RB_DUMP, NULL); 1305 } 1306 1307 /* 1308 * Describe what an address is 1309 */ 1310 void 1311 db_whatis_cmd(db_expr_t address, bool have_addr, 1312 db_expr_t count, const char *modif) 1313 { 1314 const uintptr_t addr = (uintptr_t)address; 1315 1316 lwp_whatis(addr, db_printf); 1317 pool_whatis(addr, db_printf); 1318 vmem_whatis(addr, db_printf); 1319 uvm_whatis(addr, db_printf); 1320 }
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