db_command.c revision 1.7
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 (at) 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 * $Id: db_command.c,v 1.7 1993/12/18 04:46:29 mycroft Exp $ 27 */ 28 29 /* 30 * Command dispatcher. 31 */ 32 #include <sys/param.h> 33 #include <sys/proc.h> 34 35 #include <machine/db_machdep.h> /* type definitions */ 36 37 #include <ddb/db_lex.h> 38 #include <ddb/db_output.h> 39 40 #include <setjmp.h> 41 42 /* 43 * Exported global variables 44 */ 45 boolean_t db_cmd_loop_done; 46 jmp_buf db_jmpbuf; 47 db_addr_t db_dot; 48 db_addr_t db_last_addr; 49 db_addr_t db_prev; 50 db_addr_t db_next; 51 52 /* 53 * if 'ed' style: 'dot' is set at start of last item printed, 54 * and '+' points to next line. 55 * Otherwise: 'dot' points to next item, '..' points to last. 56 */ 57 boolean_t db_ed_style = TRUE; 58 59 60 /* 61 * Utility routine - discard tokens through end-of-line. 62 */ 63 void 64 db_skip_to_eol() 65 { 66 int t; 67 do { 68 t = db_read_token(); 69 } while (t != tEOL); 70 } 71 72 /* 73 * Command table 74 */ 75 struct command { 76 char * name; /* command name */ 77 void (*fcn)(); /* function to call */ 78 int flag; /* extra info: */ 79 #define CS_OWN 0x1 /* non-standard syntax */ 80 #define CS_MORE 0x2 /* standard syntax, but may have other 81 words at end */ 82 #define CS_SET_DOT 0x100 /* set dot after command */ 83 struct command *more; /* another level of command */ 84 }; 85 86 /* 87 * Results of command search. 88 */ 89 #define CMD_UNIQUE 0 90 #define CMD_FOUND 1 91 #define CMD_NONE 2 92 #define CMD_AMBIGUOUS 3 93 #define CMD_HELP 4 94 95 /* 96 * Search for command prefix. 97 */ 98 int 99 db_cmd_search(name, table, cmdp) 100 char * name; 101 struct command *table; 102 struct command **cmdp; /* out */ 103 { 104 struct command *cmd; 105 int result = CMD_NONE; 106 107 for (cmd = table; cmd->name != 0; cmd++) { 108 register char *lp; 109 register char *rp; 110 register int c; 111 112 lp = name; 113 rp = cmd->name; 114 while ((c = *lp) == *rp) { 115 if (c == 0) { 116 /* complete match */ 117 *cmdp = cmd; 118 return (CMD_UNIQUE); 119 } 120 lp++; 121 rp++; 122 } 123 if (c == 0) { 124 /* end of name, not end of command - 125 partial match */ 126 if (result == CMD_FOUND) { 127 result = CMD_AMBIGUOUS; 128 /* but keep looking for a full match - 129 this lets us match single letters */ 130 } 131 else { 132 *cmdp = cmd; 133 result = CMD_FOUND; 134 } 135 } 136 } 137 if (result == CMD_NONE) { 138 /* check for 'help' */ 139 if (name[0] == 'h' && name[1] == 'e' 140 && name[2] == 'l' && name[3] == 'p') 141 result = CMD_HELP; 142 } 143 return (result); 144 } 145 146 void 147 db_cmd_list(table) 148 struct command *table; 149 { 150 register struct command *cmd; 151 152 for (cmd = table; cmd->name != 0; cmd++) { 153 db_printf("%-12s", cmd->name); 154 db_end_line(); 155 } 156 } 157 158 void 159 db_command(last_cmdp, cmd_table) 160 struct command **last_cmdp; /* IN_OUT */ 161 struct command *cmd_table; 162 { 163 struct command *cmd; 164 int t; 165 char modif[TOK_STRING_SIZE]; 166 db_expr_t addr, count; 167 boolean_t have_addr; 168 int result; 169 170 t = db_read_token(); 171 if (t == tEOL) { 172 /* empty line repeats last command, at 'next' */ 173 cmd = *last_cmdp; 174 addr = (db_expr_t)db_next; 175 have_addr = FALSE; 176 count = 1; 177 modif[0] = '\0'; 178 } 179 else if (t == tEXCL) { 180 void db_fncall(); 181 db_fncall(); 182 return; 183 } 184 else if (t != tIDENT) { 185 db_printf("?\n"); 186 db_flush_lex(); 187 return; 188 } 189 else { 190 /* 191 * Search for command 192 */ 193 while (cmd_table) { 194 result = db_cmd_search(db_tok_string, 195 cmd_table, 196 &cmd); 197 switch (result) { 198 case CMD_NONE: 199 db_printf("No such command\n"); 200 db_flush_lex(); 201 return; 202 case CMD_AMBIGUOUS: 203 db_printf("Ambiguous\n"); 204 db_flush_lex(); 205 return; 206 case CMD_HELP: 207 db_cmd_list(cmd_table); 208 db_flush_lex(); 209 return; 210 default: 211 break; 212 } 213 if ((cmd_table = cmd->more) != 0) { 214 t = db_read_token(); 215 if (t != tIDENT) { 216 db_cmd_list(cmd_table); 217 db_flush_lex(); 218 return; 219 } 220 } 221 } 222 223 if ((cmd->flag & CS_OWN) == 0) { 224 /* 225 * Standard syntax: 226 * command [/modifier] [addr] [,count] 227 */ 228 t = db_read_token(); 229 if (t == tSLASH) { 230 t = db_read_token(); 231 if (t != tIDENT) { 232 db_printf("Bad modifier\n"); 233 db_flush_lex(); 234 return; 235 } 236 db_strcpy(modif, db_tok_string); 237 } 238 else { 239 db_unread_token(t); 240 modif[0] = '\0'; 241 } 242 243 if (db_expression(&addr)) { 244 db_dot = (db_addr_t) addr; 245 db_last_addr = db_dot; 246 have_addr = TRUE; 247 } 248 else { 249 addr = (db_expr_t) db_dot; 250 have_addr = FALSE; 251 } 252 t = db_read_token(); 253 if (t == tCOMMA) { 254 if (!db_expression(&count)) { 255 db_printf("Count missing\n"); 256 db_flush_lex(); 257 return; 258 } 259 } 260 else { 261 db_unread_token(t); 262 count = -1; 263 } 264 if ((cmd->flag & CS_MORE) == 0) { 265 db_skip_to_eol(); 266 } 267 } 268 } 269 *last_cmdp = cmd; 270 if (cmd != 0) { 271 /* 272 * Execute the command. 273 */ 274 (*cmd->fcn)(addr, have_addr, count, modif); 275 276 if (cmd->flag & CS_SET_DOT) { 277 /* 278 * If command changes dot, set dot to 279 * previous address displayed (if 'ed' style). 280 */ 281 if (db_ed_style) { 282 db_dot = db_prev; 283 } 284 else { 285 db_dot = db_next; 286 } 287 } 288 else { 289 /* 290 * If command does not change dot, 291 * set 'next' location to be the same. 292 */ 293 db_next = db_dot; 294 } 295 } 296 } 297 298 /*ARGSUSED*/ 299 void 300 db_map_print_cmd(addr, have_addr, count, modif) 301 db_expr_t addr; 302 int have_addr; 303 db_expr_t count; 304 char * modif; 305 { 306 extern void _vm_map_print(); 307 boolean_t full = FALSE; 308 309 if (modif[0] == 'f') 310 full = TRUE; 311 312 _vm_map_print(addr, full, db_printf); 313 } 314 315 /*ARGSUSED*/ 316 void 317 db_object_print_cmd(addr, have_addr, count, modif) 318 db_expr_t addr; 319 int have_addr; 320 db_expr_t count; 321 char * modif; 322 { 323 extern void _vm_object_print(); 324 boolean_t full = FALSE; 325 326 if (modif[0] == 'f') 327 full = TRUE; 328 329 _vm_object_print(addr, full, db_printf); 330 } 331 332 /* 333 * 'show' commands 334 */ 335 extern void db_show_all_procs(); 336 extern void db_listbreak_cmd(); 337 extern void db_listwatch_cmd(); 338 extern void db_show_regs(); 339 void db_show_help(); 340 341 struct command db_show_all_cmds[] = { 342 { "procs", db_show_all_procs,0, 0 }, 343 { (char *)0 } 344 }; 345 346 struct command db_show_cmds[] = { 347 { "all", 0, 0, db_show_all_cmds }, 348 { "registers", db_show_regs, 0, 0 }, 349 { "breaks", db_listbreak_cmd, 0, 0 }, 350 { "watches", db_listwatch_cmd, 0, 0 }, 351 { "map", db_map_print_cmd, 0, 0 }, 352 { "object", db_object_print_cmd, 0, 0 }, 353 { (char *)0, } 354 }; 355 356 extern void db_print_cmd(), db_examine_cmd(), db_set_cmd(); 357 extern void db_search_cmd(); 358 extern void db_write_cmd(); 359 extern void db_delete_cmd(), db_breakpoint_cmd(); 360 extern void db_deletewatch_cmd(), db_watchpoint_cmd(); 361 extern void db_single_step_cmd(), db_trace_until_call_cmd(), 362 db_trace_until_matching_cmd(), db_continue_cmd(); 363 extern void db_stack_trace_cmd(); 364 void db_help_cmd(); 365 void db_fncall(); 366 367 struct command db_command_table[] = { 368 #ifdef DB_MACHINE_COMMANDS 369 /* this must be the first entry, if it exists */ 370 { "machine", 0, 0, 0}, 371 #endif 372 { "print", db_print_cmd, 0, 0 }, 373 { "examine", db_examine_cmd, CS_SET_DOT, 0 }, 374 { "x", db_examine_cmd, CS_SET_DOT, 0 }, 375 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 }, 376 { "set", db_set_cmd, CS_OWN, 0 }, 377 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 378 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 379 { "delete", db_delete_cmd, 0, 0 }, 380 { "d", db_delete_cmd, 0, 0 }, 381 { "break", db_breakpoint_cmd, 0, 0 }, 382 { "dwatch", db_deletewatch_cmd, 0, 0 }, 383 { "watch", db_watchpoint_cmd, CS_MORE, 0 }, 384 { "step", db_single_step_cmd, 0, 0 }, 385 { "s", db_single_step_cmd, 0, 0 }, 386 { "continue", db_continue_cmd, 0, 0 }, 387 { "c", db_continue_cmd, 0, 0 }, 388 { "until", db_trace_until_call_cmd,0, 0 }, 389 { "next", db_trace_until_matching_cmd,0, 0 }, 390 { "match", db_trace_until_matching_cmd,0, 0 }, 391 { "trace", db_stack_trace_cmd, 0, 0 }, 392 { "call", db_fncall, CS_OWN, 0 }, 393 { "ps", db_show_all_procs, 0, 0 }, 394 { "show", 0, 0, db_show_cmds }, 395 { (char *)0, } 396 }; 397 398 #ifdef DB_MACHINE_COMMANDS 399 400 /* this function should be called to install the machine dependent 401 commands. It should be called before the debugger is enabled */ 402 void db_machine_commands_install(ptr) 403 struct db_command *ptr; 404 { 405 db_command_table[0].more = ptr; 406 return; 407 } 408 409 #endif 410 411 struct command *db_last_command = 0; 412 413 void 414 db_help_cmd() 415 { 416 struct command *cmd = db_command_table; 417 418 while (cmd->name != 0) { 419 db_printf("%-12s", cmd->name); 420 db_end_line(); 421 cmd++; 422 } 423 } 424 425 void 426 db_command_loop() 427 { 428 extern int db_output_line; 429 430 /* 431 * Initialize 'prev' and 'next' to dot. 432 */ 433 db_prev = db_dot; 434 db_next = db_dot; 435 436 db_cmd_loop_done = 0; 437 while (!db_cmd_loop_done) { 438 439 (void) setjmp(db_jmpbuf); 440 if (db_print_position() != 0) 441 db_printf("\n"); 442 db_output_line = 0; 443 444 db_printf("db> "); 445 (void) db_read_line(); 446 447 db_command(&db_last_command, db_command_table); 448 } 449 } 450 451 void 452 db_error(s) 453 char *s; 454 { 455 if (s) 456 db_printf(s); 457 db_flush_lex(); 458 longjmp(db_jmpbuf, 1); 459 } 460 461 462 /* 463 * Call random function: 464 * !expr(arg,arg,arg) 465 */ 466 void 467 db_fncall() 468 { 469 db_expr_t fn_addr; 470 #define MAXARGS 11 471 db_expr_t args[MAXARGS]; 472 int nargs = 0; 473 db_expr_t retval; 474 db_expr_t (*func)(); 475 int t; 476 477 if (!db_expression(&fn_addr)) { 478 db_printf("Bad function\n"); 479 db_flush_lex(); 480 return; 481 } 482 func = (db_expr_t (*) ()) fn_addr; 483 484 t = db_read_token(); 485 if (t == tLPAREN) { 486 if (db_expression(&args[0])) { 487 nargs++; 488 while ((t = db_read_token()) == tCOMMA) { 489 if (nargs == MAXARGS) { 490 db_printf("Too many arguments\n"); 491 db_flush_lex(); 492 return; 493 } 494 if (!db_expression(&args[nargs])) { 495 db_printf("Argument missing\n"); 496 db_flush_lex(); 497 return; 498 } 499 nargs++; 500 } 501 db_unread_token(t); 502 } 503 if (db_read_token() != tRPAREN) { 504 db_printf("?\n"); 505 db_flush_lex(); 506 return; 507 } 508 } 509 db_skip_to_eol(); 510 511 while (nargs < MAXARGS) { 512 args[nargs++] = 0; 513 } 514 515 retval = (*func)(args[0], args[1], args[2], args[3], args[4], 516 args[5], args[6], args[7], args[8], args[9] ); 517 db_printf("%#n\n", retval); 518 } 519
Indexes created Sun Sep 21 20:09:37 GMT 2025