db_command.c revision 1147
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 * $Id: db_command.c,v 1.3 1993/11/25 01:30:04 wollman 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 "param.h" 38#include "systm.h" 39#include "proc.h" 40#include "ddb/ddb.h" 41 42#include <ddb/db_lex.h> 43#include <ddb/db_output.h> 44 45#include <setjmp.h> 46 47/* 48 * Exported global variables 49 */ 50boolean_t db_cmd_loop_done; 51jmp_buf db_jmpbuf; 52db_addr_t db_dot; 53db_addr_t db_last_addr; 54db_addr_t db_prev; 55db_addr_t db_next; 56 57/* 58 * if 'ed' style: 'dot' is set at start of last item printed, 59 * and '+' points to next line. 60 * Otherwise: 'dot' points to next item, '..' points to last. 61 */ 62boolean_t db_ed_style = TRUE; 63 64 65/* 66 * Utility routine - discard tokens through end-of-line. 67 */ 68void 69db_skip_to_eol() 70{ 71 int t; 72 do { 73 t = db_read_token(); 74 } while (t != tEOL); 75} 76 77/* 78 * Command table 79 */ 80struct command { 81 char * name; /* command name */ 82 void (*fcn)(); /* function to call */ 83 int flag; /* extra info: */ 84#define CS_OWN 0x1 /* non-standard syntax */ 85#define CS_MORE 0x2 /* standard syntax, but may have other 86 words at end */ 87#define CS_SET_DOT 0x100 /* set dot after command */ 88 struct command *more; /* another level of command */ 89}; 90 91/* 92 * Results of command search. 93 */ 94#define CMD_UNIQUE 0 95#define CMD_FOUND 1 96#define CMD_NONE 2 97#define CMD_AMBIGUOUS 3 98#define CMD_HELP 4 99 100/* 101 * Search for command prefix. 102 */ 103int 104db_cmd_search(name, table, cmdp) 105 char * name; 106 struct command *table; 107 struct command **cmdp; /* out */ 108{ 109 struct command *cmd; 110 int result = CMD_NONE; 111 112 for (cmd = table; cmd->name != 0; cmd++) { 113 register char *lp; 114 register char *rp; 115 register int c; 116 117 lp = name; 118 rp = cmd->name; 119 while ((c = *lp) == *rp) { 120 if (c == 0) { 121 /* complete match */ 122 *cmdp = cmd; 123 return (CMD_UNIQUE); 124 } 125 lp++; 126 rp++; 127 } 128 if (c == 0) { 129 /* end of name, not end of command - 130 partial match */ 131 if (result == CMD_FOUND) { 132 result = CMD_AMBIGUOUS; 133 /* but keep looking for a full match - 134 this lets us match single letters */ 135 } 136 else { 137 *cmdp = cmd; 138 result = CMD_FOUND; 139 } 140 } 141 } 142 if (result == CMD_NONE) { 143 /* check for 'help' */ 144 if (name[0] == 'h' && name[1] == 'e' 145 && name[2] == 'l' && name[3] == 'p') 146 result = CMD_HELP; 147 } 148 return (result); 149} 150 151void 152db_cmd_list(table) 153 struct command *table; 154{ 155 register struct command *cmd; 156 157 for (cmd = table; cmd->name != 0; cmd++) { 158 db_printf("%-12s", cmd->name); 159 db_end_line(); 160 } 161} 162 163void 164db_command(last_cmdp, cmd_table) 165 struct command **last_cmdp; /* IN_OUT */ 166 struct command *cmd_table; 167{ 168 struct command *cmd; 169 int t; 170 char modif[TOK_STRING_SIZE]; 171 db_expr_t addr, count; 172 boolean_t have_addr = FALSE; 173 int result; 174 175 t = db_read_token(); 176 if (t == tEOL) { 177 /* empty line repeats last command, at 'next' */ 178 cmd = *last_cmdp; 179 addr = (db_expr_t)db_next; 180 have_addr = FALSE; 181 count = 1; 182 modif[0] = '\0'; 183 } 184 else if (t == tEXCL) { 185 void db_fncall(); 186 db_fncall(); 187 return; 188 } 189 else if (t != tIDENT) { 190 db_printf("?\n"); 191 db_flush_lex(); 192 return; 193 } 194 else { 195 /* 196 * Search for command 197 */ 198 while (cmd_table) { 199 result = db_cmd_search(db_tok_string, 200 cmd_table, 201 &cmd); 202 switch (result) { 203 case CMD_NONE: 204 db_printf("No such command\n"); 205 db_flush_lex(); 206 return; 207 case CMD_AMBIGUOUS: 208 db_printf("Ambiguous\n"); 209 db_flush_lex(); 210 return; 211 case CMD_HELP: 212 db_cmd_list(cmd_table); 213 db_flush_lex(); 214 return; 215 default: 216 break; 217 } 218 if ((cmd_table = cmd->more) != 0) { 219 t = db_read_token(); 220 if (t != tIDENT) { 221 db_cmd_list(cmd_table); 222 db_flush_lex(); 223 return; 224 } 225 } 226 } 227 228 if ((cmd->flag & CS_OWN) == 0) { 229 /* 230 * Standard syntax: 231 * command [/modifier] [addr] [,count] 232 */ 233 t = db_read_token(); 234 if (t == tSLASH) { 235 t = db_read_token(); 236 if (t != tIDENT) { 237 db_printf("Bad modifier\n"); 238 db_flush_lex(); 239 return; 240 } 241 db_strcpy(modif, db_tok_string); 242 } 243 else { 244 db_unread_token(t); 245 modif[0] = '\0'; 246 } 247 248 if (db_expression(&addr)) { 249 db_dot = (db_addr_t) addr; 250 db_last_addr = db_dot; 251 have_addr = TRUE; 252 } 253 else { 254 addr = (db_expr_t) db_dot; 255 have_addr = FALSE; 256 } 257 t = db_read_token(); 258 if (t == tCOMMA) { 259 if (!db_expression(&count)) { 260 db_printf("Count missing\n"); 261 db_flush_lex(); 262 return; 263 } 264 } 265 else { 266 db_unread_token(t); 267 count = -1; 268 } 269 if ((cmd->flag & CS_MORE) == 0) { 270 db_skip_to_eol(); 271 } 272 } 273 } 274 *last_cmdp = cmd; 275 if (cmd != 0) { 276 /* 277 * Execute the command. 278 */ 279 (*cmd->fcn)(addr, have_addr, count, modif); 280 281 if (cmd->flag & CS_SET_DOT) { 282 /* 283 * If command changes dot, set dot to 284 * previous address displayed (if 'ed' style). 285 */ 286 if (db_ed_style) { 287 db_dot = db_prev; 288 } 289 else { 290 db_dot = db_next; 291 } 292 } 293 else { 294 /* 295 * If command does not change dot, 296 * set 'next' location to be the same. 297 */ 298 db_next = db_dot; 299 } 300 } 301} 302 303/* 304 * 'show' commands 305 */ 306extern void db_listbreak_cmd(); 307extern void db_listwatch_cmd(); 308extern void db_show_regs(), db_show_one_thread(), db_show_all_threads(); 309extern void vm_map_print(), vm_object_print(), vm_page_print(); 310extern void db_ps(); 311extern void ipc_port_print(); 312void db_show_help(); 313 314struct command db_show_all_cmds[] = { 315#if 0 316 { "threads", db_show_all_threads, 0, 0 }, 317#endif 318 { "procs", db_ps, 0, 0 }, 319 { (char *)0 } 320}; 321 322struct command db_show_cmds[] = { 323 { "all", 0, 0, db_show_all_cmds }, 324 { "registers", db_show_regs, 0, 0 }, 325 { "breaks", db_listbreak_cmd, 0, 0 }, 326 { "watches", db_listwatch_cmd, 0, 0 }, 327#if 0 328 { "thread", db_show_one_thread, 0, 0 }, 329#endif 330 { "map", vm_map_print, 0, 0 }, 331 { "object", vm_object_print, 0, 0 }, 332#if 0 333 { "page", vm_page_print, 0, 0 }, 334#endif 335#if 0 336 { "port", ipc_port_print, 0, 0 }, 337#endif 338 { (char *)0, } 339}; 340 341extern void db_print_cmd(), db_examine_cmd(), db_set_cmd(); 342extern void db_search_cmd(); 343extern void db_write_cmd(); 344extern void db_delete_cmd(), db_breakpoint_cmd(); 345extern void db_deletewatch_cmd(), db_watchpoint_cmd(); 346extern void db_single_step_cmd(), db_trace_until_call_cmd(), 347 db_trace_until_matching_cmd(), db_continue_cmd(); 348extern void db_stack_trace_cmd(); 349void db_help_cmd(); 350void db_fncall(); 351 352struct command db_command_table[] = { 353 { "print", db_print_cmd, 0, 0 }, 354 { "examine", db_examine_cmd, CS_SET_DOT, 0 }, 355 { "x", db_examine_cmd, CS_SET_DOT, 0 }, 356 { "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 }, 357 { "set", db_set_cmd, CS_OWN, 0 }, 358 { "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 359 { "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, 360 { "delete", db_delete_cmd, 0, 0 }, 361 { "d", db_delete_cmd, 0, 0 }, 362 { "break", db_breakpoint_cmd, 0, 0 }, 363 { "dwatch", db_deletewatch_cmd, 0, 0 }, 364 { "watch", db_watchpoint_cmd, CS_MORE,0 }, 365 { "step", db_single_step_cmd, 0, 0 }, 366 { "s", db_single_step_cmd, 0, 0 }, 367 { "continue", db_continue_cmd, 0, 0 }, 368 { "c", db_continue_cmd, 0, 0 }, 369 { "until", db_trace_until_call_cmd,0, 0 }, 370 { "next", db_trace_until_matching_cmd,0, 0 }, 371 { "match", db_trace_until_matching_cmd,0, 0 }, 372 { "trace", db_stack_trace_cmd, 0, 0 }, 373 { "call", db_fncall, CS_OWN, 0 }, 374 { "show", 0, 0, db_show_cmds }, 375 { "ps", db_ps, 0, 0 }, 376 { (char *)0, } 377}; 378 379struct command *db_last_command = 0; 380 381void 382db_help_cmd() 383{ 384 struct command *cmd = db_command_table; 385 386 while (cmd->name != 0) { 387 db_printf("%-12s", cmd->name); 388 db_end_line(); 389 cmd++; 390 } 391} 392 393void 394db_command_loop() 395{ 396 /* 397 * Initialize 'prev' and 'next' to dot. 398 */ 399 db_prev = db_dot; 400 db_next = db_dot; 401 402 db_cmd_loop_done = 0; 403 while (!db_cmd_loop_done) { 404 405 (void) setjmp(db_jmpbuf); 406 if (db_print_position() != 0) 407 db_printf("\n"); 408 409 db_printf("db> "); 410 (void) db_read_line(); 411 412 db_command(&db_last_command, db_command_table); 413 } 414} 415 416void 417db_error(s) 418 char *s; 419{ 420 if (s) 421 db_printf(s); 422 db_flush_lex(); 423 longjmp(db_jmpbuf, 1); 424} 425 426 427/* 428 * Call random function: 429 * !expr(arg,arg,arg) 430 */ 431void 432db_fncall() 433{ 434 db_expr_t fn_addr; 435#define MAXARGS 11 436 db_expr_t args[MAXARGS]; 437 int nargs = 0; 438 db_expr_t retval; 439 db_expr_t (*func)(); 440 int t; 441 442 if (!db_expression(&fn_addr)) { 443 db_printf("Bad function\n"); 444 db_flush_lex(); 445 return; 446 } 447 func = (db_expr_t (*) ()) fn_addr; 448 449 t = db_read_token(); 450 if (t == tLPAREN) { 451 if (db_expression(&args[0])) { 452 nargs++; 453 while ((t = db_read_token()) == tCOMMA) { 454 if (nargs == MAXARGS) { 455 db_printf("Too many arguments\n"); 456 db_flush_lex(); 457 return; 458 } 459 if (!db_expression(&args[nargs])) { 460 db_printf("Argument missing\n"); 461 db_flush_lex(); 462 return; 463 } 464 nargs++; 465 } 466 db_unread_token(t); 467 } 468 if (db_read_token() != tRPAREN) { 469 db_printf("?\n"); 470 db_flush_lex(); 471 return; 472 } 473 } 474 db_skip_to_eol(); 475 476 while (nargs < MAXARGS) { 477 args[nargs++] = 0; 478 } 479 480 retval = (*func)(args[0], args[1], args[2], args[3], args[4], 481 args[5], args[6], args[7], args[8], args[9] ); 482 db_printf("%#n\n", retval); 483} 484