Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/ddb/db_command.c
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1 /* 2 * Mach Operating System 3 * Copyright (c) 1991,1990 Carnegie Mellon University 4 * All Rights Reserved. 5 * 6 * Permission to use, copy, modify and distribute this software and its 7 * documentation is hereby granted, provided that both the copyright 8 * notice and this permission notice appear in all copies of the 9 * software, derivative works or modified versions, and any portions 10 * thereof, and that both notices appear in supporting documentation. 11 * 12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS 13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 15 * 16 * Carnegie Mellon requests users of this software to return to 17 * 18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 19 * School of Computer Science 20 * Carnegie Mellon University 21 * Pittsburgh PA 15213-3890 22 * 23 * any improvements or extensions that they make and grant Carnegie the 24 * rights to redistribute these changes. 25 * 26 * $FreeBSD: src/sys/ddb/db_command.c,v 1.34.2.2 2001/07/29 22:48:36 kris Exp $ 27 */ 28 29 /* 30 * Author: David B. Golub, Carnegie Mellon University 31 * Date: 7/90 32 */ 33 34 /* 35 * Command dispatcher. 36 */ 37 #include <sys/param.h> 38 #include <sys/linker_set.h> 39 #include <sys/reboot.h> 40 #include <sys/systm.h> 41 #include <sys/cons.h> 42 43 #include <ddb/ddb.h> 44 #include <ddb/db_command.h> 45 #include <ddb/db_lex.h> 46 #include <ddb/db_output.h> 47 48 #include <machine/md_var.h> /* needed for db_reset() */ 49 50 #include <setjmp.h> 51 52 /* 53 * Exported global variables 54 */ 55 boolean_t db_cmd_loop_done; 56 db_addr_t db_dot; 57 jmp_buf db_jmpbuf; 58 db_addr_t db_last_addr; 59 db_addr_t db_prev; 60 db_addr_t db_next; 61 62 SET_DECLARE(db_cmd_set, struct command); 63 SET_DECLARE(db_show_cmd_set, struct command); 64 65 static db_cmdfcn_t db_fncall; 66 static db_cmdfcn_t db_gdb; 67 static db_cmdfcn_t db_reset; 68 69 /* 70 * 'show' commands 71 */ 72 73 static struct command db_show_all_cmds[] = { 74 #if 0 75 { "threads", db_show_all_threads, 0, 0 }, 76 #endif 77 { "procs", db_ps, 0, 0 }, 78 { NULL } 79 }; 80 81 static struct command db_show_cmds[] = { 82 { "all", 0, 0, db_show_all_cmds }, 83 { "registers", db_show_regs, 0, 0 }, 84 { "breaks", db_listbreak_cmd, 0, 0 }, 85 #if 0 86 { "thread", db_show_one_thread, 0, 0 }, 87 #endif 88 #if 0 89 { "port", ipc_port_print, 0, 0 }, 90 #endif 91 { NULL, } 92 }; 93 94 static struct command db_command_table[] = { 95 { "print", db_print_cmd, 0, 0 }, 96 { "p", db_print_cmd, 0, 0 }, 97 { "examine", db_examine_cmd, CS_SET_DOT, 0 }, 98 { "x", db_examine_cmd, CS_SET_DOT, 0 }, 99 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 }, 100 { "set", db_set_cmd, CS_OWN, 0 }, 101 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 102 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 103 { "delete", db_delete_cmd, 0, 0 }, 104 { "d", db_delete_cmd, 0, 0 }, 105 { "break", db_breakpoint_cmd, 0, 0 }, 106 { "dwatch", db_deletewatch_cmd, 0, 0 }, 107 { "watch", db_watchpoint_cmd, CS_MORE,0 }, 108 { "dhwatch", db_deletehwatch_cmd, 0, 0 }, 109 { "hwatch", db_hwatchpoint_cmd, 0, 0 }, 110 { "step", db_single_step_cmd, 0, 0 }, 111 { "s", db_single_step_cmd, 0, 0 }, 112 { "continue", db_continue_cmd, 0, 0 }, 113 { "c", db_continue_cmd, 0, 0 }, 114 { "until", db_trace_until_call_cmd,0, 0 }, 115 { "next", db_trace_until_matching_cmd,0, 0 }, 116 { "match", db_trace_until_matching_cmd,0, 0 }, 117 { "trace", db_stack_trace_cmd, 0, 0 }, 118 { "where", db_stack_trace_cmd, 0, 0 }, 119 { "call", db_fncall, CS_OWN, 0 }, 120 { "show", 0, 0, db_show_cmds }, 121 { "ps", db_ps, 0, 0 }, 122 { "gdb", db_gdb, 0, 0 }, 123 { "reset", db_reset, 0, 0 }, 124 { NULL, } 125 }; 126 127 static struct command *db_last_command = NULL; 128 129 /* 130 * if 'ed' style: 'dot' is set at start of last item printed, 131 * and '+' points to next line. 132 * Otherwise: 'dot' points to next item, '..' points to last. 133 */ 134 static boolean_t db_ed_style = TRUE; 135 136 /* 137 * Utility routine - discard tokens through end-of-line. 138 */ 139 void 140 db_skip_to_eol(void) 141 { 142 int t; 143 do { 144 t = db_read_token(); 145 } while (t != tEOL); 146 } 147 148 /* 149 * Results of command search. 150 */ 151 #define CMD_UNIQUE 0 152 #define CMD_FOUND 1 153 #define CMD_NONE 2 154 #define CMD_AMBIGUOUS 3 155 #define CMD_HELP 4 156 157 static void db_cmd_list (struct command *table, 158 struct command **aux_tablep, 159 struct command **aux_tablep_end); 160 static int db_cmd_search (char *name, struct command *table, 161 struct command **aux_tablep, 162 struct command **aux_tablep_end, 163 struct command **cmdp); 164 static void db_command (struct command **last_cmdp, 165 struct command *cmd_table, 166 struct command **aux_cmd_tablep, 167 struct command **aux_cmd_tablep_end); 168 169 /* 170 * Search for command prefix. 171 * 172 * Parameters: 173 * cmdp: out 174 */ 175 static int 176 db_cmd_search(char *name, struct command *table, struct command **aux_tablep, 177 struct command **aux_tablep_end, struct command **cmdp) 178 { 179 struct command *cmd; 180 struct command **aux_cmdp; 181 int result = CMD_NONE; 182 183 for (cmd = table; cmd->name != 0; cmd++) { 184 char *lp; 185 char *rp; 186 int c; 187 188 lp = name; 189 rp = cmd->name; 190 while ((c = *lp) == *rp) { 191 if (c == 0) { 192 /* complete match */ 193 *cmdp = cmd; 194 return (CMD_UNIQUE); 195 } 196 lp++; 197 rp++; 198 } 199 if (c == 0) { 200 /* end of name, not end of command - 201 partial match */ 202 if (result == CMD_FOUND) { 203 result = CMD_AMBIGUOUS; 204 /* but keep looking for a full match - 205 this lets us match single letters */ 206 } 207 else { 208 *cmdp = cmd; 209 result = CMD_FOUND; 210 } 211 } 212 } 213 if (result == CMD_NONE && aux_tablep != NULL) 214 /* XXX repeat too much code. */ 215 for (aux_cmdp = aux_tablep; aux_cmdp < aux_tablep_end; aux_cmdp++) { 216 char *lp; 217 char *rp; 218 int c; 219 220 lp = name; 221 rp = (*aux_cmdp)->name; 222 while ((c = *lp) == *rp) { 223 if (c == 0) { 224 /* complete match */ 225 *cmdp = *aux_cmdp; 226 return (CMD_UNIQUE); 227 } 228 lp++; 229 rp++; 230 } 231 if (c == 0) { 232 /* end of name, not end of command - 233 partial match */ 234 if (result == CMD_FOUND) { 235 result = CMD_AMBIGUOUS; 236 /* but keep looking for a full match - 237 this lets us match single letters */ 238 } 239 else { 240 *cmdp = *aux_cmdp; 241 result = CMD_FOUND; 242 } 243 } 244 } 245 if (result == CMD_NONE) { 246 /* check for 'help' */ 247 if (name[0] == 'h' && name[1] == 'e' 248 && name[2] == 'l' && name[3] == 'p') 249 result = CMD_HELP; 250 } 251 return (result); 252 } 253 254 static void 255 db_cmd_list(struct command *table, struct command **aux_tablep, 256 struct command **aux_tablep_end) 257 { 258 struct command *cmd; 259 struct command **aux_cmdp; 260 261 for (cmd = table; cmd->name != 0; cmd++) { 262 db_printf("%-12s", cmd->name); 263 db_end_line(12); 264 } 265 if (aux_tablep == NULL) 266 return; 267 for (aux_cmdp = aux_tablep; aux_cmdp < aux_tablep_end; aux_cmdp++) { 268 db_printf("%-12s", (*aux_cmdp)->name); 269 db_end_line(12); 270 } 271 } 272 273 /* 274 * Parameters: 275 * last_cmdp: IN_OUT 276 */ 277 static void 278 db_command(struct command **last_cmdp, struct command *cmd_table, 279 struct command **aux_cmd_tablep, struct command **aux_cmd_tablep_end) 280 { 281 struct command *cmd; 282 int t; 283 char modif[TOK_STRING_SIZE]; 284 db_expr_t addr, count; 285 boolean_t have_addr = FALSE; 286 int result; 287 288 cmd = NULL; 289 t = db_read_token(); 290 if (t == tEOL) { 291 /* empty line repeats last command, at 'next' */ 292 cmd = *last_cmdp; 293 addr = (db_expr_t)db_next; 294 have_addr = FALSE; 295 count = 1; 296 modif[0] = '\0'; 297 } 298 else if (t == tEXCL) { 299 db_fncall((db_expr_t)0, (boolean_t)0, (db_expr_t)0, NULL); 300 return; 301 } 302 else if (t != tIDENT) { 303 db_printf("?\n"); 304 db_flush_lex(); 305 return; 306 } 307 else { 308 /* 309 * Search for command 310 */ 311 while (cmd_table) { 312 result = db_cmd_search(db_tok_string, 313 cmd_table, 314 aux_cmd_tablep, 315 aux_cmd_tablep_end, 316 &cmd); 317 switch (result) { 318 case CMD_NONE: 319 db_printf("No such command\n"); 320 db_flush_lex(); 321 return; 322 case CMD_AMBIGUOUS: 323 db_printf("Ambiguous\n"); 324 db_flush_lex(); 325 return; 326 case CMD_HELP: 327 db_cmd_list(cmd_table, aux_cmd_tablep, aux_cmd_tablep_end); 328 db_flush_lex(); 329 return; 330 default: 331 break; 332 } 333 if ((cmd_table = cmd->more) != NULL) { 334 /* XXX usually no more aux's. */ 335 aux_cmd_tablep = NULL; 336 if (cmd_table == db_show_cmds) { 337 aux_cmd_tablep = SET_BEGIN(db_show_cmd_set); 338 aux_cmd_tablep_end = SET_LIMIT(db_show_cmd_set); 339 } 340 341 t = db_read_token(); 342 if (t != tIDENT) { 343 db_cmd_list(cmd_table, aux_cmd_tablep, aux_cmd_tablep_end); 344 db_flush_lex(); 345 return; 346 } 347 } 348 } 349 350 if ((cmd->flag & CS_OWN) == 0) { 351 /* 352 * Standard syntax: 353 * command [/modifier] [addr] [,count] 354 */ 355 t = db_read_token(); 356 if (t == tSLASH) { 357 t = db_read_token(); 358 if (t != tIDENT && t != tNUMBER) { 359 db_printf("Bad modifier\n"); 360 db_flush_lex(); 361 return; 362 } 363 db_strcpy(modif, db_tok_string); 364 } 365 else { 366 db_unread_token(t); 367 modif[0] = '\0'; 368 } 369 370 if (db_expression(&addr)) { 371 db_dot = (db_addr_t) addr; 372 db_last_addr = db_dot; 373 have_addr = TRUE; 374 } 375 else { 376 addr = (db_expr_t) db_dot; 377 have_addr = FALSE; 378 } 379 t = db_read_token(); 380 if (t == tCOMMA) { 381 if (!db_expression(&count)) { 382 db_printf("Count missing\n"); 383 db_flush_lex(); 384 return; 385 } 386 } 387 else { 388 db_unread_token(t); 389 count = -1; 390 } 391 if ((cmd->flag & CS_MORE) == 0) { 392 db_skip_to_eol(); 393 } 394 } 395 } 396 *last_cmdp = cmd; 397 if (cmd != NULL) { 398 /* 399 * Execute the command. 400 */ 401 (*cmd->fcn)(addr, have_addr, count, modif); 402 403 if (cmd->flag & CS_SET_DOT) { 404 /* 405 * If command changes dot, set dot to 406 * previous address displayed (if 'ed' style). 407 */ 408 if (db_ed_style) { 409 db_dot = db_prev; 410 } 411 else { 412 db_dot = db_next; 413 } 414 } 415 else { 416 /* 417 * If command does not change dot, 418 * set 'next' location to be the same. 419 */ 420 db_next = db_dot; 421 } 422 } 423 } 424 425 #if 0 426 void 427 db_help_cmd(void) 428 { 429 struct command *cmd = db_command_table; 430 431 while (cmd->name != 0) { 432 db_printf("%-12s", cmd->name); 433 db_end_line(12); 434 cmd++; 435 } 436 } 437 #endif 438 439 /* 440 * At least one non-optional command must be implemented using 441 * DB_COMMAND() so that db_cmd_set gets created. Here is one. 442 */ 443 DB_COMMAND(panic, db_panic) 444 { 445 panic("from debugger"); 446 } 447 448 void 449 db_command_loop(void) 450 { 451 /* 452 * Initialize 'prev' and 'next' to dot. 453 */ 454 db_prev = db_dot; 455 db_next = db_dot; 456 457 db_cmd_loop_done = 0; 458 while (!db_cmd_loop_done) { 459 460 setjmp(db_jmpbuf); 461 if (db_print_position() != 0) 462 db_printf("\n"); 463 464 db_printf("db> "); 465 db_read_line(); 466 467 db_command(&db_last_command, db_command_table, 468 SET_BEGIN(db_cmd_set), SET_LIMIT(db_cmd_set)); 469 } 470 } 471 472 void 473 db_error(char *s) 474 { 475 if (s) 476 db_printf("%s", s); 477 db_flush_lex(); 478 longjmp(db_jmpbuf, 1); 479 } 480 481 482 /* 483 * Call random function: 484 * !expr(arg,arg,arg) 485 */ 486 static void 487 db_fncall(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4) 488 { 489 db_expr_t fn_addr; 490 #define MAXARGS 11 /* XXX only 10 are passed */ 491 db_expr_t args[MAXARGS]; 492 int nargs = 0; 493 db_expr_t retval; 494 typedef db_expr_t fcn_10args_t (db_expr_t, db_expr_t, db_expr_t, 495 db_expr_t, db_expr_t, db_expr_t, 496 db_expr_t, db_expr_t, db_expr_t, 497 db_expr_t); 498 fcn_10args_t *func; 499 int t; 500 501 if (!db_expression(&fn_addr)) { 502 db_printf("Bad function\n"); 503 db_flush_lex(); 504 return; 505 } 506 func = (fcn_10args_t *)fn_addr; /* XXX */ 507 508 t = db_read_token(); 509 if (t == tLPAREN) { 510 if (db_expression(&args[0])) { 511 nargs++; 512 while ((t = db_read_token()) == tCOMMA) { 513 if (nargs == MAXARGS) { 514 db_printf("Too many arguments\n"); 515 db_flush_lex(); 516 return; 517 } 518 if (!db_expression(&args[nargs])) { 519 db_printf("Argument missing\n"); 520 db_flush_lex(); 521 return; 522 } 523 nargs++; 524 } 525 db_unread_token(t); 526 } 527 if (db_read_token() != tRPAREN) { 528 db_printf("?\n"); 529 db_flush_lex(); 530 return; 531 } 532 } 533 db_skip_to_eol(); 534 535 while (nargs < MAXARGS) { 536 args[nargs++] = 0; 537 } 538 539 retval = (*func)(args[0], args[1], args[2], args[3], args[4], 540 args[5], args[6], args[7], args[8], args[9] ); 541 db_printf("%#lr\n", (long)retval); 542 } 543 544 /* Enter GDB remote protocol debugger on the next trap. */ 545 546 static void 547 db_gdb(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char *dummy4) 548 { 549 if (gdb_tab == NULL) { 550 db_printf("No gdb port enabled. Set flag 0x80 on desired port\n"); 551 db_printf("in your configuration file (currently sio only).\n"); 552 return; 553 } 554 boothowto ^= RB_GDB; 555 556 db_printf("Next trap will enter %s\n", 557 boothowto & RB_GDB ? "GDB remote protocol mode" 558 : "DDB debugger"); 559 } 560 561 static void 562 db_reset(db_expr_t dummy1, boolean_t dummy2, db_expr_t dummy3, char * dummy4) 563 { 564 cpu_reset(); 565 }
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