db_command.c revision 1.13
1 /* $NetBSD: db_command.c,v 1.13 1994/10/09 08:29:59 mycroft 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 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 /* 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 #include <ddb/db_command.h> 40 41 #include <setjmp.h> 42 43 /* 44 * Exported global variables 45 */ 46 boolean_t db_cmd_loop_done; 47 jmp_buf *db_recover; 48 49 /* 50 * if 'ed' style: 'dot' is set at start of last item printed, 51 * and '+' points to next line. 52 * Otherwise: 'dot' points to next item, '..' points to last. 53 */ 54 boolean_t db_ed_style = TRUE; 55 56 /* 57 * Utility routine - discard tokens through end-of-line. 58 */ 59 void 60 db_skip_to_eol() 61 { 62 int t; 63 do { 64 t = db_read_token(); 65 } while (t != tEOL); 66 } 67 68 /* 69 * Results of command search. 70 */ 71 #define CMD_UNIQUE 0 72 #define CMD_FOUND 1 73 #define CMD_NONE 2 74 #define CMD_AMBIGUOUS 3 75 #define CMD_HELP 4 76 77 /* 78 * Search for command prefix. 79 */ 80 int 81 db_cmd_search(name, table, cmdp) 82 char *name; 83 struct db_command *table; 84 struct db_command **cmdp; /* out */ 85 { 86 struct db_command *cmd; 87 int result = CMD_NONE; 88 89 for (cmd = table; cmd->name != 0; cmd++) { 90 register char *lp; 91 register char *rp; 92 register int c; 93 94 lp = name; 95 rp = cmd->name; 96 while ((c = *lp) == *rp) { 97 if (c == 0) { 98 /* complete match */ 99 *cmdp = cmd; 100 return (CMD_UNIQUE); 101 } 102 lp++; 103 rp++; 104 } 105 if (c == 0) { 106 /* end of name, not end of command - 107 partial match */ 108 if (result == CMD_FOUND) { 109 result = CMD_AMBIGUOUS; 110 /* but keep looking for a full match - 111 this lets us match single letters */ 112 } 113 else { 114 *cmdp = cmd; 115 result = CMD_FOUND; 116 } 117 } 118 } 119 if (result == CMD_NONE) { 120 /* check for 'help' */ 121 if (name[0] == 'h' && name[1] == 'e' 122 && name[2] == 'l' && name[3] == 'p') 123 result = CMD_HELP; 124 } 125 return (result); 126 } 127 128 void 129 db_cmd_list(table) 130 struct db_command *table; 131 { 132 register struct db_command *cmd; 133 134 for (cmd = table; cmd->name != 0; cmd++) { 135 db_printf("%-12s", cmd->name); 136 db_end_line(); 137 } 138 } 139 140 void 141 db_command(last_cmdp, cmd_table) 142 struct db_command **last_cmdp; /* IN_OUT */ 143 struct db_command *cmd_table; 144 { 145 struct db_command *cmd; 146 int t; 147 char modif[TOK_STRING_SIZE]; 148 db_expr_t addr, count; 149 boolean_t have_addr; 150 int result; 151 152 t = db_read_token(); 153 if (t == tEOL) { 154 /* empty line repeats last command, at 'next' */ 155 cmd = *last_cmdp; 156 addr = (db_expr_t)db_next; 157 have_addr = FALSE; 158 count = 1; 159 modif[0] = '\0'; 160 } 161 else if (t == tEXCL) { 162 void db_fncall(); 163 db_fncall(); 164 return; 165 } 166 else if (t != tIDENT) { 167 db_printf("?\n"); 168 db_flush_lex(); 169 return; 170 } 171 else { 172 /* 173 * Search for command 174 */ 175 while (cmd_table) { 176 result = db_cmd_search(db_tok_string, 177 cmd_table, 178 &cmd); 179 switch (result) { 180 case CMD_NONE: 181 db_printf("No such command\n"); 182 db_flush_lex(); 183 return; 184 case CMD_AMBIGUOUS: 185 db_printf("Ambiguous\n"); 186 db_flush_lex(); 187 return; 188 case CMD_HELP: 189 db_cmd_list(cmd_table); 190 db_flush_lex(); 191 return; 192 default: 193 break; 194 } 195 if ((cmd_table = cmd->more) != 0) { 196 t = db_read_token(); 197 if (t != tIDENT) { 198 db_cmd_list(cmd_table); 199 db_flush_lex(); 200 return; 201 } 202 } 203 } 204 205 if ((cmd->flag & CS_OWN) == 0) { 206 /* 207 * Standard syntax: 208 * command [/modifier] [addr] [,count] 209 */ 210 t = db_read_token(); 211 if (t == tSLASH) { 212 t = db_read_token(); 213 if (t != tIDENT) { 214 db_printf("Bad modifier\n"); 215 db_flush_lex(); 216 return; 217 } 218 db_strcpy(modif, db_tok_string); 219 } 220 else { 221 db_unread_token(t); 222 modif[0] = '\0'; 223 } 224 225 if (db_expression(&addr)) { 226 db_dot = (db_addr_t) addr; 227 db_last_addr = db_dot; 228 have_addr = TRUE; 229 } 230 else { 231 addr = (db_expr_t) db_dot; 232 have_addr = FALSE; 233 } 234 t = db_read_token(); 235 if (t == tCOMMA) { 236 if (!db_expression(&count)) { 237 db_printf("Count missing\n"); 238 db_flush_lex(); 239 return; 240 } 241 } 242 else { 243 db_unread_token(t); 244 count = -1; 245 } 246 if ((cmd->flag & CS_MORE) == 0) { 247 db_skip_to_eol(); 248 } 249 } 250 } 251 *last_cmdp = cmd; 252 if (cmd != 0) { 253 /* 254 * Execute the command. 255 */ 256 (*cmd->fcn)(addr, have_addr, count, modif); 257 258 if (cmd->flag & CS_SET_DOT) { 259 /* 260 * If command changes dot, set dot to 261 * previous address displayed (if 'ed' style). 262 */ 263 if (db_ed_style) { 264 db_dot = db_prev; 265 } 266 else { 267 db_dot = db_next; 268 } 269 } 270 else { 271 /* 272 * If command does not change dot, 273 * set 'next' location to be the same. 274 */ 275 db_next = db_dot; 276 } 277 } 278 } 279 280 /*ARGSUSED*/ 281 void 282 db_map_print_cmd(addr, have_addr, count, modif) 283 db_expr_t addr; 284 int have_addr; 285 db_expr_t count; 286 char * modif; 287 { 288 extern void _vm_map_print(); 289 boolean_t full = FALSE; 290 291 if (modif[0] == 'f') 292 full = TRUE; 293 294 _vm_map_print(addr, full, db_printf); 295 } 296 297 /*ARGSUSED*/ 298 void 299 db_object_print_cmd(addr, have_addr, count, modif) 300 db_expr_t addr; 301 int have_addr; 302 db_expr_t count; 303 char * modif; 304 { 305 extern void _vm_object_print(); 306 boolean_t full = FALSE; 307 308 if (modif[0] == 'f') 309 full = TRUE; 310 311 _vm_object_print(addr, full, db_printf); 312 } 313 314 /* 315 * 'show' commands 316 */ 317 extern void db_show_all_procs(); 318 extern void db_show_callout(); 319 extern void db_listbreak_cmd(); 320 extern void db_listwatch_cmd(); 321 extern void db_show_regs(); 322 void db_show_help(); 323 324 struct db_command db_show_all_cmds[] = { 325 { "procs", db_show_all_procs,0, 0 }, 326 { "callout", db_show_callout,0, 0 }, 327 { (char *)0 } 328 }; 329 330 struct db_command db_show_cmds[] = { 331 { "all", 0, 0, db_show_all_cmds }, 332 { "registers", db_show_regs, 0, 0 }, 333 { "breaks", db_listbreak_cmd, 0, 0 }, 334 { "watches", db_listwatch_cmd, 0, 0 }, 335 { "map", db_map_print_cmd, 0, 0 }, 336 { "object", db_object_print_cmd, 0, 0 }, 337 { (char *)0, } 338 }; 339 340 extern void db_print_cmd(), db_examine_cmd(), db_set_cmd(); 341 extern void db_search_cmd(); 342 extern void db_write_cmd(); 343 extern void db_delete_cmd(), db_breakpoint_cmd(); 344 extern void db_deletewatch_cmd(), db_watchpoint_cmd(); 345 extern void db_single_step_cmd(), db_trace_until_call_cmd(), 346 db_trace_until_matching_cmd(), db_continue_cmd(); 347 extern void db_stack_trace_cmd(); 348 void db_help_cmd(); 349 void db_fncall(); 350 351 struct db_command db_command_table[] = { 352 #ifdef DB_MACHINE_COMMANDS 353 /* this must be the first entry, if it exists */ 354 { "machine", 0, 0, 0}, 355 #endif 356 { "print", db_print_cmd, 0, 0 }, 357 { "examine", db_examine_cmd, CS_SET_DOT, 0 }, 358 { "x", db_examine_cmd, CS_SET_DOT, 0 }, 359 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 }, 360 { "set", db_set_cmd, CS_OWN, 0 }, 361 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 362 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 363 { "delete", db_delete_cmd, 0, 0 }, 364 { "d", db_delete_cmd, 0, 0 }, 365 { "break", db_breakpoint_cmd, 0, 0 }, 366 { "dwatch", db_deletewatch_cmd, 0, 0 }, 367 { "watch", db_watchpoint_cmd, CS_MORE, 0 }, 368 { "step", db_single_step_cmd, 0, 0 }, 369 { "s", db_single_step_cmd, 0, 0 }, 370 { "continue", db_continue_cmd, 0, 0 }, 371 { "c", db_continue_cmd, 0, 0 }, 372 { "until", db_trace_until_call_cmd,0, 0 }, 373 { "next", db_trace_until_matching_cmd,0, 0 }, 374 { "match", db_trace_until_matching_cmd,0, 0 }, 375 { "trace", db_stack_trace_cmd, 0, 0 }, 376 { "call", db_fncall, CS_OWN, 0 }, 377 { "ps", db_show_all_procs, 0, 0 }, 378 { "callout", db_show_callout, 0, 0 }, 379 { "show", 0, 0, db_show_cmds }, 380 { (char *)0, } 381 }; 382 383 #ifdef DB_MACHINE_COMMANDS 384 385 /* this function should be called to install the machine dependent 386 commands. It should be called before the debugger is enabled */ 387 void db_machine_commands_install(ptr) 388 struct db_command *ptr; 389 { 390 db_command_table[0].more = ptr; 391 return; 392 } 393 394 #endif 395 396 struct db_command *db_last_command = 0; 397 398 void 399 db_help_cmd() 400 { 401 struct db_command *cmd = db_command_table; 402 403 while (cmd->name != 0) { 404 db_printf("%-12s", cmd->name); 405 db_end_line(); 406 cmd++; 407 } 408 } 409 410 void 411 db_command_loop() 412 { 413 jmp_buf db_jmpbuf; 414 jmp_buf *savejmp = db_recover; 415 extern int db_output_line; 416 417 /* 418 * Initialize 'prev' and 'next' to dot. 419 */ 420 db_prev = db_dot; 421 db_next = db_dot; 422 423 db_cmd_loop_done = 0; 424 (void) setjmp(*(db_recover = &db_jmpbuf)); 425 426 while (!db_cmd_loop_done) { 427 if (db_print_position() != 0) 428 db_printf("\n"); 429 db_output_line = 0; 430 431 db_printf("db> "); 432 (void) db_read_line(); 433 434 db_command(&db_last_command, db_command_table); 435 } 436 437 db_recover = savejmp; 438 } 439 440 void 441 db_error(s) 442 char *s; 443 { 444 if (s) 445 db_printf(s); 446 db_flush_lex(); 447 longjmp(*db_recover, 1); 448 } 449 450 451 /* 452 * Call random function: 453 * !expr(arg,arg,arg) 454 */ 455 void 456 db_fncall() 457 { 458 db_expr_t fn_addr; 459 #define MAXARGS 11 460 db_expr_t args[MAXARGS]; 461 int nargs = 0; 462 db_expr_t retval; 463 db_expr_t (*func)(); 464 int t; 465 466 if (!db_expression(&fn_addr)) { 467 db_printf("Bad function\n"); 468 db_flush_lex(); 469 return; 470 } 471 func = (db_expr_t (*) ()) fn_addr; 472 473 t = db_read_token(); 474 if (t == tLPAREN) { 475 if (db_expression(&args[0])) { 476 nargs++; 477 while ((t = db_read_token()) == tCOMMA) { 478 if (nargs == MAXARGS) { 479 db_printf("Too many arguments\n"); 480 db_flush_lex(); 481 return; 482 } 483 if (!db_expression(&args[nargs])) { 484 db_printf("Argument missing\n"); 485 db_flush_lex(); 486 return; 487 } 488 nargs++; 489 } 490 db_unread_token(t); 491 } 492 if (db_read_token() != tRPAREN) { 493 db_printf("?\n"); 494 db_flush_lex(); 495 return; 496 } 497 } 498 db_skip_to_eol(); 499 500 while (nargs < MAXARGS) { 501 args[nargs++] = 0; 502 } 503 504 retval = (*func)(args[0], args[1], args[2], args[3], args[4], 505 args[5], args[6], args[7], args[8], args[9] ); 506 db_printf("%#n\n", retval); 507 } 508
Indexes created Tue Sep 30 10:09:55 GMT 2025