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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 | /* | |
27 | * HISTORY | |
28 | * $Log: db_command.c,v $ | |
29 | * Revision 1.1 1992/03/25 21:45:02 pace | |
30 | * Initial revision | |
31 | * | |
32 | * Revision 2.6 91/02/05 17:06:10 mrt | |
33 | * Changed to new Mach copyright | |
34 | * [91/01/31 16:17:18 mrt] | |
35 | * | |
36 | * Revision 2.5 91/01/08 17:31:54 rpd | |
37 | * Forward reference for db_fncall(); | |
38 | * [91/01/04 12:35:17 rvb] | |
39 | * | |
40 | * Add call as a synonym for ! and match for next | |
41 | * [91/01/04 12:14:48 rvb] | |
42 | * | |
43 | * Revision 2.4 90/11/07 16:49:15 rpd | |
44 | * Added search. | |
45 | * [90/11/06 rpd] | |
46 | * | |
47 | * Revision 2.3 90/10/25 14:43:45 rwd | |
48 | * Changed db_fncall to print the result unsigned. | |
49 | * [90/10/19 rpd] | |
50 | * | |
51 | * Added CS_MORE to db_watchpoint_cmd. | |
52 | * [90/10/17 rpd] | |
53 | * Added watchpoint commands: watch, dwatch, show watches. | |
54 | * [90/10/16 rpd] | |
55 | * | |
56 | * Revision 2.2 90/08/27 21:50:10 dbg | |
57 | * Remove 'listbreaks' - use 'show breaks' instead. Change 'show | |
58 | * threads' to 'show all threads' to avoid clash with 'show thread'. | |
59 | * Set 'dot' here from db_prev or db_next, depending on 'db_ed_style' | |
60 | * flag and syntax table. | |
61 | * [90/08/22 dbg] | |
62 | * Reduce lint. | |
63 | * [90/08/07 dbg] | |
64 | * Created. | |
65 | * [90/07/25 dbg] | |
66 | * | |
67 | */ | |
68 | /* | |
69 | * Author: David B. Golub, Carnegie Mellon University | |
70 | * Date: 7/90 | |
71 | */ | |
72 | /* | |
73 | * Command dispatcher. | |
74 | */ | |
75 | #include "param.h" | |
76 | #include "proc.h" | |
77 | #include <machine/db_machdep.h> /* type definitions */ | |
78 | ||
79 | #include <ddb/db_lex.h> | |
80 | #include <ddb/db_output.h> | |
81 | ||
82 | #include <setjmp.h> | |
83 | ||
84 | /* | |
85 | * Exported global variables | |
86 | */ | |
87 | boolean_t db_cmd_loop_done; | |
88 | jmp_buf db_jmpbuf; | |
89 | db_addr_t db_dot; | |
90 | db_addr_t db_last_addr; | |
91 | db_addr_t db_prev; | |
92 | db_addr_t db_next; | |
93 | ||
94 | /* | |
95 | * if 'ed' style: 'dot' is set at start of last item printed, | |
96 | * and '+' points to next line. | |
97 | * Otherwise: 'dot' points to next item, '..' points to last. | |
98 | */ | |
99 | boolean_t db_ed_style = TRUE; | |
100 | ||
101 | ||
102 | /* | |
103 | * Utility routine - discard tokens through end-of-line. | |
104 | */ | |
105 | void | |
106 | db_skip_to_eol() | |
107 | { | |
108 | int t; | |
109 | do { | |
110 | t = db_read_token(); | |
111 | } while (t != tEOL); | |
112 | } | |
113 | ||
114 | /* | |
115 | * Command table | |
116 | */ | |
117 | struct command { | |
118 | char * name; /* command name */ | |
119 | void (*fcn)(); /* function to call */ | |
120 | int flag; /* extra info: */ | |
121 | #define CS_OWN 0x1 /* non-standard syntax */ | |
122 | #define CS_MORE 0x2 /* standard syntax, but may have other | |
123 | words at end */ | |
124 | #define CS_SET_DOT 0x100 /* set dot after command */ | |
125 | struct command *more; /* another level of command */ | |
126 | }; | |
127 | ||
128 | /* | |
129 | * Results of command search. | |
130 | */ | |
131 | #define CMD_UNIQUE 0 | |
132 | #define CMD_FOUND 1 | |
133 | #define CMD_NONE 2 | |
134 | #define CMD_AMBIGUOUS 3 | |
135 | #define CMD_HELP 4 | |
136 | ||
137 | /* | |
138 | * Search for command prefix. | |
139 | */ | |
140 | int | |
141 | db_cmd_search(name, table, cmdp) | |
142 | char * name; | |
143 | struct command *table; | |
144 | struct command **cmdp; /* out */ | |
145 | { | |
146 | struct command *cmd; | |
147 | int result = CMD_NONE; | |
148 | ||
149 | for (cmd = table; cmd->name != 0; cmd++) { | |
150 | register char *lp; | |
151 | register char *rp; | |
152 | register int c; | |
153 | ||
154 | lp = name; | |
155 | rp = cmd->name; | |
156 | while ((c = *lp) == *rp) { | |
157 | if (c == 0) { | |
158 | /* complete match */ | |
159 | *cmdp = cmd; | |
160 | return (CMD_UNIQUE); | |
161 | } | |
162 | lp++; | |
163 | rp++; | |
164 | } | |
165 | if (c == 0) { | |
166 | /* end of name, not end of command - | |
167 | partial match */ | |
168 | if (result == CMD_FOUND) { | |
169 | result = CMD_AMBIGUOUS; | |
170 | /* but keep looking for a full match - | |
171 | this lets us match single letters */ | |
172 | } | |
173 | else { | |
174 | *cmdp = cmd; | |
175 | result = CMD_FOUND; | |
176 | } | |
177 | } | |
178 | } | |
179 | if (result == CMD_NONE) { | |
180 | /* check for 'help' */ | |
181 | if (name[0] == 'h' && name[1] == 'e' | |
182 | && name[2] == 'l' && name[3] == 'p') | |
183 | result = CMD_HELP; | |
184 | } | |
185 | return (result); | |
186 | } | |
187 | ||
188 | void | |
189 | db_cmd_list(table) | |
190 | struct command *table; | |
191 | { | |
192 | register struct command *cmd; | |
193 | ||
194 | for (cmd = table; cmd->name != 0; cmd++) { | |
195 | db_printf("%-12s", cmd->name); | |
196 | db_end_line(); | |
197 | } | |
198 | } | |
199 | ||
200 | void | |
201 | db_command(last_cmdp, cmd_table) | |
202 | struct command **last_cmdp; /* IN_OUT */ | |
203 | struct command *cmd_table; | |
204 | { | |
205 | struct command *cmd; | |
206 | int t; | |
207 | char modif[TOK_STRING_SIZE]; | |
208 | db_expr_t addr, count; | |
209 | boolean_t have_addr; | |
210 | int result; | |
211 | ||
212 | t = db_read_token(); | |
213 | if (t == tEOL) { | |
214 | /* empty line repeats last command, at 'next' */ | |
215 | cmd = *last_cmdp; | |
216 | addr = (db_expr_t)db_next; | |
217 | have_addr = FALSE; | |
218 | count = 1; | |
219 | modif[0] = '\0'; | |
220 | } | |
221 | else if (t == tEXCL) { | |
222 | void db_fncall(); | |
223 | db_fncall(); | |
224 | return; | |
225 | } | |
226 | else if (t != tIDENT) { | |
227 | db_printf("?\n"); | |
228 | db_flush_lex(); | |
229 | return; | |
230 | } | |
231 | else { | |
232 | /* | |
233 | * Search for command | |
234 | */ | |
235 | while (cmd_table) { | |
236 | result = db_cmd_search(db_tok_string, | |
237 | cmd_table, | |
238 | &cmd); | |
239 | switch (result) { | |
240 | case CMD_NONE: | |
241 | db_printf("No such command\n"); | |
242 | db_flush_lex(); | |
243 | return; | |
244 | case CMD_AMBIGUOUS: | |
245 | db_printf("Ambiguous\n"); | |
246 | db_flush_lex(); | |
247 | return; | |
248 | case CMD_HELP: | |
249 | db_cmd_list(cmd_table); | |
250 | db_flush_lex(); | |
251 | return; | |
252 | default: | |
253 | break; | |
254 | } | |
255 | if ((cmd_table = cmd->more) != 0) { | |
256 | t = db_read_token(); | |
257 | if (t != tIDENT) { | |
258 | db_cmd_list(cmd_table); | |
259 | db_flush_lex(); | |
260 | return; | |
261 | } | |
262 | } | |
263 | } | |
264 | ||
265 | if ((cmd->flag & CS_OWN) == 0) { | |
266 | /* | |
267 | * Standard syntax: | |
268 | * command [/modifier] [addr] [,count] | |
269 | */ | |
270 | t = db_read_token(); | |
271 | if (t == tSLASH) { | |
272 | t = db_read_token(); | |
273 | if (t != tIDENT) { | |
274 | db_printf("Bad modifier\n"); | |
275 | db_flush_lex(); | |
276 | return; | |
277 | } | |
278 | db_strcpy(modif, db_tok_string); | |
279 | } | |
280 | else { | |
281 | db_unread_token(t); | |
282 | modif[0] = '\0'; | |
283 | } | |
284 | ||
285 | if (db_expression(&addr)) { | |
286 | db_dot = (db_addr_t) addr; | |
287 | db_last_addr = db_dot; | |
288 | have_addr = TRUE; | |
289 | } | |
290 | else { | |
291 | addr = (db_expr_t) db_dot; | |
292 | have_addr = FALSE; | |
293 | } | |
294 | t = db_read_token(); | |
295 | if (t == tCOMMA) { | |
296 | if (!db_expression(&count)) { | |
297 | db_printf("Count missing\n"); | |
298 | db_flush_lex(); | |
299 | return; | |
300 | } | |
301 | } | |
302 | else { | |
303 | db_unread_token(t); | |
304 | count = -1; | |
305 | } | |
306 | if ((cmd->flag & CS_MORE) == 0) { | |
307 | db_skip_to_eol(); | |
308 | } | |
309 | } | |
310 | } | |
311 | *last_cmdp = cmd; | |
312 | if (cmd != 0) { | |
313 | /* | |
314 | * Execute the command. | |
315 | */ | |
316 | (*cmd->fcn)(addr, have_addr, count, modif); | |
317 | ||
318 | if (cmd->flag & CS_SET_DOT) { | |
319 | /* | |
320 | * If command changes dot, set dot to | |
321 | * previous address displayed (if 'ed' style). | |
322 | */ | |
323 | if (db_ed_style) { | |
324 | db_dot = db_prev; | |
325 | } | |
326 | else { | |
327 | db_dot = db_next; | |
328 | } | |
329 | } | |
330 | else { | |
331 | /* | |
332 | * If command does not change dot, | |
333 | * set 'next' location to be the same. | |
334 | */ | |
335 | db_next = db_dot; | |
336 | } | |
337 | } | |
338 | } | |
339 | ||
340 | /* | |
341 | * 'show' commands | |
342 | */ | |
343 | extern void db_listbreak_cmd(); | |
344 | extern void db_listwatch_cmd(); | |
345 | extern void db_show_regs(), db_show_one_thread(), db_show_all_threads(); | |
346 | extern void vm_map_print(), vm_object_print(), vm_page_print(); | |
347 | extern void ipc_port_print(); | |
348 | void db_show_help(); | |
349 | ||
350 | struct command db_show_all_cmds[] = { | |
351 | #if 0 | |
352 | { "threads", db_show_all_threads,0, 0 }, | |
353 | #endif | |
354 | { (char *)0 } | |
355 | }; | |
356 | ||
357 | struct command db_show_cmds[] = { | |
358 | { "all", 0, 0, db_show_all_cmds }, | |
359 | { "registers", db_show_regs, 0, 0 }, | |
360 | { "breaks", db_listbreak_cmd, 0, 0 }, | |
361 | { "watches", db_listwatch_cmd, 0, 0 }, | |
362 | #if 0 | |
363 | { "thread", db_show_one_thread, 0, 0 }, | |
364 | #endif | |
365 | { "map", vm_map_print, 0, 0 }, | |
366 | { "object", vm_object_print, 0, 0 }, | |
367 | #if 0 | |
368 | { "page", vm_page_print, 0, 0 }, | |
369 | #endif | |
370 | #if 0 | |
371 | { "port", ipc_port_print, 0, 0 }, | |
372 | #endif | |
373 | { (char *)0, } | |
374 | }; | |
375 | ||
376 | extern void db_print_cmd(), db_examine_cmd(), db_set_cmd(); | |
377 | extern void db_search_cmd(); | |
378 | extern void db_write_cmd(); | |
379 | extern void db_delete_cmd(), db_breakpoint_cmd(); | |
380 | extern void db_deletewatch_cmd(), db_watchpoint_cmd(); | |
381 | extern void db_single_step_cmd(), db_trace_until_call_cmd(), | |
382 | db_trace_until_matching_cmd(), db_continue_cmd(); | |
383 | extern void db_stack_trace_cmd(); | |
384 | void db_help_cmd(); | |
385 | void db_fncall(); | |
386 | ||
387 | struct command db_command_table[] = { | |
388 | { "print", db_print_cmd, 0, 0 }, | |
389 | { "examine", db_examine_cmd, CS_SET_DOT, 0 }, | |
390 | { "x", db_examine_cmd, CS_SET_DOT, 0 }, | |
391 | { "search", db_search_cmd, CS_OWN|CS_SET_DOT, 0 }, | |
392 | { "set", db_set_cmd, CS_OWN, 0 }, | |
393 | { "write", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, | |
394 | { "w", db_write_cmd, CS_MORE|CS_SET_DOT, 0 }, | |
395 | { "delete", db_delete_cmd, 0, 0 }, | |
396 | { "d", db_delete_cmd, 0, 0 }, | |
397 | { "break", db_breakpoint_cmd, 0, 0 }, | |
398 | { "dwatch", db_deletewatch_cmd, 0, 0 }, | |
399 | { "watch", db_watchpoint_cmd, CS_MORE,0 }, | |
400 | { "step", db_single_step_cmd, 0, 0 }, | |
401 | { "s", db_single_step_cmd, 0, 0 }, | |
402 | { "continue", db_continue_cmd, 0, 0 }, | |
403 | { "c", db_continue_cmd, 0, 0 }, | |
404 | { "until", db_trace_until_call_cmd,0, 0 }, | |
405 | { "next", db_trace_until_matching_cmd,0, 0 }, | |
406 | { "match", db_trace_until_matching_cmd,0, 0 }, | |
407 | { "trace", db_stack_trace_cmd, 0, 0 }, | |
408 | { "call", db_fncall, CS_OWN, 0 }, | |
409 | { "show", 0, 0, db_show_cmds }, | |
410 | { (char *)0, } | |
411 | }; | |
412 | ||
413 | struct command *db_last_command = 0; | |
414 | ||
415 | void | |
416 | db_help_cmd() | |
417 | { | |
418 | struct command *cmd = db_command_table; | |
419 | ||
420 | while (cmd->name != 0) { | |
421 | db_printf("%-12s", cmd->name); | |
422 | db_end_line(); | |
423 | cmd++; | |
424 | } | |
425 | } | |
426 | ||
427 | void | |
428 | db_command_loop() | |
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 | ||
443 | db_printf("db> "); | |
444 | (void) db_read_line(); | |
445 | ||
446 | db_command(&db_last_command, db_command_table); | |
447 | } | |
448 | } | |
449 | ||
450 | void | |
451 | db_error(s) | |
452 | char *s; | |
453 | { | |
454 | if (s) | |
455 | db_printf(s); | |
456 | db_flush_lex(); | |
457 | longjmp(db_jmpbuf, 1); | |
458 | } | |
459 | ||
460 | ||
461 | /* | |
462 | * Call random function: | |
463 | * !expr(arg,arg,arg) | |
464 | */ | |
465 | void | |
466 | db_fncall() | |
467 | { | |
468 | db_expr_t fn_addr; | |
469 | #define MAXARGS 11 | |
470 | db_expr_t args[MAXARGS]; | |
471 | int nargs = 0; | |
472 | db_expr_t retval; | |
473 | db_expr_t (*func)(); | |
474 | int t; | |
475 | ||
476 | if (!db_expression(&fn_addr)) { | |
477 | db_printf("Bad function\n"); | |
478 | db_flush_lex(); | |
479 | return; | |
480 | } | |
481 | func = (db_expr_t (*) ()) fn_addr; | |
482 | ||
483 | t = db_read_token(); | |
484 | if (t == tLPAREN) { | |
485 | if (db_expression(&args[0])) { | |
486 | nargs++; | |
487 | while ((t = db_read_token()) == tCOMMA) { | |
488 | if (nargs == MAXARGS) { | |
489 | db_printf("Too many arguments\n"); | |
490 | db_flush_lex(); | |
491 | return; | |
492 | } | |
493 | if (!db_expression(&args[nargs])) { | |
494 | db_printf("Argument missing\n"); | |
495 | db_flush_lex(); | |
496 | return; | |
497 | } | |
498 | nargs++; | |
499 | } | |
500 | db_unread_token(t); | |
501 | } | |
502 | if (db_read_token() != tRPAREN) { | |
503 | db_printf("?\n"); | |
504 | db_flush_lex(); | |
505 | return; | |
506 | } | |
507 | } | |
508 | db_skip_to_eol(); | |
509 | ||
510 | while (nargs < MAXARGS) { | |
511 | args[nargs++] = 0; | |
512 | } | |
513 | ||
514 | retval = (*func)(args[0], args[1], args[2], args[3], args[4], | |
515 | args[5], args[6], args[7], args[8], args[9] ); | |
516 | db_printf("%#n\n", retval); | |
517 | } | |
518 | ||
519 | int | |
520 | strcmp(s1, s2) | |
521 | register const char *s1, *s2; | |
522 | { | |
523 | while (*s1 == *s2++) | |
524 | if (*s1++ == 0) | |
525 | return (0); | |
526 | return (*(unsigned char *)s1 - *(unsigned char *)--s2); | |
527 | } | |
528 | ||
529 | ||
530 | ||
531 |