db_command.c revision 1.15
1 /* $NetBSD: db_command.c,v 1.15 1995/10/26 14:52:33 gwr 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 <vm/vm.h> 36 37 #include <machine/db_machdep.h> /* type definitions */ 38 39 #include <ddb/db_lex.h> 40 #include <ddb/db_output.h> 41 #include <ddb/db_command.h> 42 43 #include <setjmp.h> 44 45 /* 46 * Exported global variables 47 */ 48 boolean_t db_cmd_loop_done; 49 jmp_buf *db_recover; 50 51 /* 52 * if 'ed' style: 'dot' is set at start of last item printed, 53 * and '+' points to next line. 54 * Otherwise: 'dot' points to next item, '..' points to last. 55 */ 56 boolean_t db_ed_style = TRUE; 57 58 /* 59 * Utility routine - discard tokens through end-of-line. 60 */ 61 void 62 db_skip_to_eol() 63 { 64 int t; 65 do { 66 t = db_read_token(); 67 } while (t != tEOL); 68 } 69 70 /* 71 * Results of command search. 72 */ 73 #define CMD_UNIQUE 0 74 #define CMD_FOUND 1 75 #define CMD_NONE 2 76 #define CMD_AMBIGUOUS 3 77 #define CMD_HELP 4 78 79 /* 80 * Search for command prefix. 81 */ 82 int 83 db_cmd_search(name, table, cmdp) 84 char *name; 85 struct db_command *table; 86 struct db_command **cmdp; /* out */ 87 { 88 struct db_command *cmd; 89 int result = CMD_NONE; 90 91 for (cmd = table; cmd->name != 0; cmd++) { 92 register char *lp; 93 register char *rp; 94 register int c; 95 96 lp = name; 97 rp = cmd->name; 98 while ((c = *lp) == *rp) { 99 if (c == 0) { 100 /* complete match */ 101 *cmdp = cmd; 102 return (CMD_UNIQUE); 103 } 104 lp++; 105 rp++; 106 } 107 if (c == 0) { 108 /* end of name, not end of command - 109 partial match */ 110 if (result == CMD_FOUND) { 111 result = CMD_AMBIGUOUS; 112 /* but keep looking for a full match - 113 this lets us match single letters */ 114 } 115 else { 116 *cmdp = cmd; 117 result = CMD_FOUND; 118 } 119 } 120 } 121 if (result == CMD_NONE) { 122 /* check for 'help' */ 123 if (name[0] == 'h' && name[1] == 'e' 124 && name[2] == 'l' && name[3] == 'p') 125 result = CMD_HELP; 126 } 127 return (result); 128 } 129 130 void 131 db_cmd_list(table) 132 struct db_command *table; 133 { 134 register struct db_command *cmd; 135 136 for (cmd = table; cmd->name != 0; cmd++) { 137 db_printf("%-12s", cmd->name); 138 db_end_line(); 139 } 140 } 141 142 void 143 db_command(last_cmdp, cmd_table) 144 struct db_command **last_cmdp; /* IN_OUT */ 145 struct db_command *cmd_table; 146 { 147 struct db_command *cmd; 148 int t; 149 char modif[TOK_STRING_SIZE]; 150 db_expr_t addr, count; 151 boolean_t have_addr; 152 int result; 153 154 t = db_read_token(); 155 if (t == tEOL) { 156 /* empty line repeats last command, at 'next' */ 157 cmd = *last_cmdp; 158 addr = (db_expr_t)db_next; 159 have_addr = FALSE; 160 count = 1; 161 modif[0] = '\0'; 162 } 163 else if (t == tEXCL) { 164 void db_fncall(); 165 db_fncall(); 166 return; 167 } 168 else if (t != tIDENT) { 169 db_printf("?\n"); 170 db_flush_lex(); 171 return; 172 } 173 else { 174 /* 175 * Search for command 176 */ 177 while (cmd_table) { 178 result = db_cmd_search(db_tok_string, 179 cmd_table, 180 &cmd); 181 switch (result) { 182 case CMD_NONE: 183 db_printf("No such command\n"); 184 db_flush_lex(); 185 return; 186 case CMD_AMBIGUOUS: 187 db_printf("Ambiguous\n"); 188 db_flush_lex(); 189 return; 190 case CMD_HELP: 191 db_cmd_list(cmd_table); 192 db_flush_lex(); 193 return; 194 default: 195 break; 196 } 197 if ((cmd_table = cmd->more) != 0) { 198 t = db_read_token(); 199 if (t != tIDENT) { 200 db_cmd_list(cmd_table); 201 db_flush_lex(); 202 return; 203 } 204 } 205 } 206 207 if ((cmd->flag & CS_OWN) == 0) { 208 /* 209 * Standard syntax: 210 * command [/modifier] [addr] [,count] 211 */ 212 t = db_read_token(); 213 if (t == tSLASH) { 214 t = db_read_token(); 215 if (t != tIDENT) { 216 db_printf("Bad modifier\n"); 217 db_flush_lex(); 218 return; 219 } 220 db_strcpy(modif, db_tok_string); 221 } 222 else { 223 db_unread_token(t); 224 modif[0] = '\0'; 225 } 226 227 if (db_expression(&addr)) { 228 db_dot = (db_addr_t) addr; 229 db_last_addr = db_dot; 230 have_addr = TRUE; 231 } 232 else { 233 addr = (db_expr_t) db_dot; 234 have_addr = FALSE; 235 } 236 t = db_read_token(); 237 if (t == tCOMMA) { 238 if (!db_expression(&count)) { 239 db_printf("Count missing\n"); 240 db_flush_lex(); 241 return; 242 } 243 } 244 else { 245 db_unread_token(t); 246 count = -1; 247 } 248 if ((cmd->flag & CS_MORE) == 0) { 249 db_skip_to_eol(); 250 } 251 } 252 } 253 *last_cmdp = cmd; 254 if (cmd != 0) { 255 /* 256 * Execute the command. 257 */ 258 (*cmd->fcn)(addr, have_addr, count, modif); 259 260 if (cmd->flag & CS_SET_DOT) { 261 /* 262 * If command changes dot, set dot to 263 * previous address displayed (if 'ed' style). 264 */ 265 if (db_ed_style) { 266 db_dot = db_prev; 267 } 268 else { 269 db_dot = db_next; 270 } 271 } 272 else { 273 /* 274 * If command does not change dot, 275 * set 'next' location to be the same. 276 */ 277 db_next = db_dot; 278 } 279 } 280 } 281 282 /*ARGSUSED*/ 283 void 284 db_map_print_cmd(addr, have_addr, count, modif) 285 db_expr_t addr; 286 int have_addr; 287 db_expr_t count; 288 char * modif; 289 { 290 extern void _vm_map_print(); 291 boolean_t full = FALSE; 292 293 if (modif[0] == 'f') 294 full = TRUE; 295 296 _vm_map_print((vm_map_t)addr, full, db_printf); 297 } 298 299 /*ARGSUSED*/ 300 void 301 db_object_print_cmd(addr, have_addr, count, modif) 302 db_expr_t addr; 303 int have_addr; 304 db_expr_t count; 305 char * modif; 306 { 307 extern void _vm_object_print(); 308 boolean_t full = FALSE; 309 310 if (modif[0] == 'f') 311 full = TRUE; 312 313 _vm_object_print((vm_object_t)addr, full, db_printf); 314 } 315 316 /* 317 * 'show' commands 318 */ 319 extern void db_show_all_procs(); 320 extern void db_show_callout(); 321 extern void db_listbreak_cmd(); 322 extern void db_listwatch_cmd(); 323 extern void db_show_regs(); 324 void db_show_help(); 325 326 struct db_command db_show_all_cmds[] = { 327 { "procs", db_show_all_procs,0, 0 }, 328 { "callout", db_show_callout,0, 0 }, 329 { (char *)0 } 330 }; 331 332 struct db_command db_show_cmds[] = { 333 { "all", 0, 0, db_show_all_cmds }, 334 { "registers", db_show_regs, 0, 0 }, 335 { "breaks", db_listbreak_cmd, 0, 0 }, 336 { "watches", db_listwatch_cmd, 0, 0 }, 337 { "map", db_map_print_cmd, 0, 0 }, 338 { "object", db_object_print_cmd, 0, 0 }, 339 { (char *)0, } 340 }; 341 342 extern void db_print_cmd(), db_examine_cmd(), db_set_cmd(); 343 extern void db_search_cmd(); 344 extern void db_write_cmd(); 345 extern void db_delete_cmd(), db_breakpoint_cmd(); 346 extern void db_deletewatch_cmd(), db_watchpoint_cmd(); 347 extern void db_single_step_cmd(), db_trace_until_call_cmd(), 348 db_trace_until_matching_cmd(), db_continue_cmd(); 349 extern void db_stack_trace_cmd(); 350 void db_help_cmd(); 351 void db_fncall(); 352 353 struct db_command db_command_table[] = { 354 #ifdef DB_MACHINE_COMMANDS 355 /* this must be the first entry, if it exists */ 356 { "machine", 0, 0, 0}, 357 #endif 358 { "print", db_print_cmd, 0, 0 }, 359 { "examine", db_examine_cmd, CS_SET_DOT, 0 }, 360 { "x", db_examine_cmd, CS_SET_DOT, 0 }, 361 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 }, 362 { "set", db_set_cmd, CS_OWN, 0 }, 363 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 364 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 365 { "delete", db_delete_cmd, 0, 0 }, 366 { "d", db_delete_cmd, 0, 0 }, 367 { "break", db_breakpoint_cmd, 0, 0 }, 368 { "dwatch", db_deletewatch_cmd, 0, 0 }, 369 { "watch", db_watchpoint_cmd, CS_MORE, 0 }, 370 { "step", db_single_step_cmd, 0, 0 }, 371 { "s", db_single_step_cmd, 0, 0 }, 372 { "continue", db_continue_cmd, 0, 0 }, 373 { "c", db_continue_cmd, 0, 0 }, 374 { "until", db_trace_until_call_cmd,0, 0 }, 375 { "next", db_trace_until_matching_cmd,0, 0 }, 376 { "match", db_trace_until_matching_cmd,0, 0 }, 377 { "trace", db_stack_trace_cmd, 0, 0 }, 378 { "call", db_fncall, CS_OWN, 0 }, 379 { "ps", db_show_all_procs, 0, 0 }, 380 { "callout", db_show_callout, 0, 0 }, 381 { "show", 0, 0, db_show_cmds }, 382 { (char *)0, } 383 }; 384 385 #ifdef DB_MACHINE_COMMANDS 386 387 /* this function should be called to install the machine dependent 388 commands. It should be called before the debugger is enabled */ 389 void db_machine_commands_install(ptr) 390 struct db_command *ptr; 391 { 392 db_command_table[0].more = ptr; 393 return; 394 } 395 396 #endif 397 398 struct db_command *db_last_command = 0; 399 400 void 401 db_help_cmd() 402 { 403 struct db_command *cmd = db_command_table; 404 405 while (cmd->name != 0) { 406 db_printf("%-12s", cmd->name); 407 db_end_line(); 408 cmd++; 409 } 410 } 411 412 void 413 db_command_loop() 414 { 415 jmp_buf db_jmpbuf; 416 jmp_buf *savejmp = db_recover; 417 extern int db_output_line; 418 419 /* 420 * Initialize 'prev' and 'next' to dot. 421 */ 422 db_prev = db_dot; 423 db_next = db_dot; 424 425 db_cmd_loop_done = 0; 426 (void) setjmp(*(db_recover = &db_jmpbuf)); 427 428 while (!db_cmd_loop_done) { 429 if (db_print_position() != 0) 430 db_printf("\n"); 431 db_output_line = 0; 432 433 db_printf("db> "); 434 (void) db_read_line(); 435 436 db_command(&db_last_command, db_command_table); 437 } 438 439 db_recover = savejmp; 440 } 441 442 void 443 db_error(s) 444 char *s; 445 { 446 if (s) 447 db_printf(s); 448 db_flush_lex(); 449 longjmp(*db_recover, 1); 450 } 451 452 453 /* 454 * Call random function: 455 * !expr(arg,arg,arg) 456 */ 457 void 458 db_fncall() 459 { 460 db_expr_t fn_addr; 461 #define MAXARGS 11 462 db_expr_t args[MAXARGS]; 463 int nargs = 0; 464 db_expr_t retval; 465 db_expr_t (*func)(); 466 int t; 467 468 if (!db_expression(&fn_addr)) { 469 db_printf("Bad function\n"); 470 db_flush_lex(); 471 return; 472 } 473 func = (db_expr_t (*) ()) fn_addr; 474 475 t = db_read_token(); 476 if (t == tLPAREN) { 477 if (db_expression(&args[0])) { 478 nargs++; 479 while ((t = db_read_token()) == tCOMMA) { 480 if (nargs == MAXARGS) { 481 db_printf("Too many arguments\n"); 482 db_flush_lex(); 483 return; 484 } 485 if (!db_expression(&args[nargs])) { 486 db_printf("Argument missing\n"); 487 db_flush_lex(); 488 return; 489 } 490 nargs++; 491 } 492 db_unread_token(t); 493 } 494 if (db_read_token() != tRPAREN) { 495 db_printf("?\n"); 496 db_flush_lex(); 497 return; 498 } 499 } 500 db_skip_to_eol(); 501 502 while (nargs < MAXARGS) { 503 args[nargs++] = 0; 504 } 505 506 retval = (*func)(args[0], args[1], args[2], args[3], args[4], 507 args[5], args[6], args[7], args[8], args[9] ); 508 db_printf("%#n\n", retval); 509 } 510
Indexes created Tue Sep 30 11:09:46 GMT 2025