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1.1 nbrk 1: /* $OpenBSD: db_command.c,v 1.45 2006/09/30 14:31:28 mickey Exp $ */
2: /* $NetBSD: db_command.c,v 1.20 1996/03/30 22:30:05 christos Exp $ */
3:
4: /*
5: * Mach Operating System
6: * Copyright (c) 1993,1992,1991,1990 Carnegie Mellon University
7: * All Rights Reserved.
8: *
9: * Permission to use, copy, modify and distribute this software and its
10: * documentation is hereby granted, provided that both the copyright
11: * notice and this permission notice appear in all copies of the
12: * software, derivative works or modified versions, and any portions
13: * thereof, and that both notices appear in supporting documentation.
14: *
15: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
17: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18: *
19: * Carnegie Mellon requests users of this software to return to
20: *
21: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22: * School of Computer Science
23: * Carnegie Mellon University
24: * Pittsburgh PA 15213-3890
25: *
26: * any improvements or extensions that they make and grant Carnegie Mellon
27: * the rights to redistribute these changes.
28: */
29:
30: /*
31: * Command dispatcher.
32: */
33: #include <sys/param.h>
34: #include <sys/systm.h>
35: #include <sys/proc.h>
36: #include <sys/reboot.h>
37: #include <sys/extent.h>
38: #include <sys/pool.h>
39: #include <sys/msgbuf.h>
40: #include <sys/malloc.h>
41:
42: #include <uvm/uvm_extern.h>
43: #include <machine/db_machdep.h> /* type definitions */
44:
45: #include <ddb/db_lex.h>
46: #include <ddb/db_output.h>
47: #include <ddb/db_command.h>
48: #include <ddb/db_break.h>
49: #include <ddb/db_watch.h>
50: #include <ddb/db_run.h>
51: #include <ddb/db_variables.h>
52: #include <ddb/db_interface.h>
53: #include <ddb/db_sym.h>
54: #include <ddb/db_extern.h>
55:
56: #include <uvm/uvm_ddb.h>
57:
58: /*
59: * Exported global variables
60: */
61: boolean_t db_cmd_loop_done;
62: label_t *db_recover;
63:
64: /*
65: * if 'ed' style: 'dot' is set at start of last item printed,
66: * and '+' points to next line.
67: * Otherwise: 'dot' points to next item, '..' points to last.
68: */
69: boolean_t db_ed_style = TRUE;
70:
71: db_addr_t db_dot; /* current location */
72: db_addr_t db_last_addr; /* last explicit address typed */
73: db_addr_t db_prev; /* last address examined
74: or written */
75: db_addr_t db_next; /* next address to be examined
76: or written */
77:
78: /*
79: * Utility routine - discard tokens through end-of-line.
80: */
81: void
82: db_skip_to_eol(void)
83: {
84: int t;
85: do {
86: t = db_read_token();
87: } while (t != tEOL);
88: }
89:
90: /*
91: * Results of command search.
92: */
93: #define CMD_UNIQUE 0
94: #define CMD_FOUND 1
95: #define CMD_NONE 2
96: #define CMD_AMBIGUOUS 3
97:
98: /*
99: * Search for command prefix.
100: */
101: int
102: db_cmd_search(char *name, struct db_command *table, struct db_command **cmdp)
103: {
104: struct db_command *cmd;
105: int result = CMD_NONE;
106:
107: for (cmd = table; cmd->name != 0; cmd++) {
108: char *lp;
109: char *rp;
110: 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: return (result);
138: }
139:
140: void
141: db_cmd_list(struct db_command *table)
142: {
143: struct db_command *cmd;
144:
145: for (cmd = table; cmd->name != 0; cmd++) {
146: db_printf("%-12s", cmd->name);
147: db_end_line(12);
148: }
149: }
150:
151: void
152: db_command(struct db_command **last_cmdp, struct db_command *cmd_table)
153: {
154: struct db_command *cmd;
155: int t;
156: char modif[TOK_STRING_SIZE];
157: db_expr_t addr, count;
158: boolean_t have_addr = FALSE;
159: int result;
160:
161: t = db_read_token();
162: if (t == tEOL) {
163: /* empty line repeats last command, at 'next' */
164: cmd = *last_cmdp;
165: addr = (db_expr_t)db_next;
166: have_addr = FALSE;
167: count = 1;
168: modif[0] = '\0';
169: }
170: else if (t == tEXCL) {
171: db_fncall(0, 0, 0, NULL);
172: return;
173: }
174: else if (t != tIDENT) {
175: db_printf("?\n");
176: db_flush_lex();
177: return;
178: }
179: else {
180: /*
181: * Search for command
182: */
183: while (cmd_table) {
184: result = db_cmd_search(db_tok_string,
185: cmd_table,
186: &cmd);
187: switch (result) {
188: case CMD_NONE:
189: db_printf("No such command\n");
190: db_flush_lex();
191: return;
192: case CMD_AMBIGUOUS:
193: db_printf("Ambiguous\n");
194: db_flush_lex();
195: return;
196: default:
197: break;
198: }
199: if ((cmd_table = cmd->more) != 0) {
200: t = db_read_token();
201: if (t != tIDENT) {
202: db_cmd_list(cmd_table);
203: db_flush_lex();
204: return;
205: }
206: }
207: }
208:
209: if ((cmd->flag & CS_OWN) == 0) {
210: /*
211: * Standard syntax:
212: * command [/modifier] [addr] [,count]
213: */
214: t = db_read_token();
215: if (t == tSLASH) {
216: t = db_read_token();
217: if (t != tIDENT) {
218: db_printf("Bad modifier\n");
219: db_flush_lex();
220: return;
221: }
222: db_strlcpy(modif, db_tok_string, sizeof(modif));
223: }
224: else {
225: db_unread_token(t);
226: modif[0] = '\0';
227: }
228:
229: if (db_expression(&addr)) {
230: db_dot = (db_addr_t) addr;
231: db_last_addr = db_dot;
232: have_addr = TRUE;
233: }
234: else {
235: addr = (db_expr_t) db_dot;
236: have_addr = FALSE;
237: }
238: t = db_read_token();
239: if (t == tCOMMA) {
240: if (!db_expression(&count)) {
241: db_printf("Count missing\n");
242: db_flush_lex();
243: return;
244: }
245: }
246: else {
247: db_unread_token(t);
248: count = -1;
249: }
250: if ((cmd->flag & CS_MORE) == 0) {
251: db_skip_to_eol();
252: }
253: }
254: }
255: *last_cmdp = cmd;
256: if (cmd != 0) {
257: /*
258: * Execute the command.
259: */
260: (*cmd->fcn)(addr, have_addr, count, modif);
261:
262: if (cmd->flag & CS_SET_DOT) {
263: /*
264: * If command changes dot, set dot to
265: * previous address displayed (if 'ed' style).
266: */
267: if (db_ed_style) {
268: db_dot = db_prev;
269: }
270: else {
271: db_dot = db_next;
272: }
273: }
274: else {
275: /*
276: * If command does not change dot,
277: * set 'next' location to be the same.
278: */
279: db_next = db_dot;
280: }
281: }
282: }
283:
284: /*ARGSUSED*/
285: void
286: db_buf_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
287: {
288: boolean_t full = FALSE;
289:
290: if (modif[0] == 'f')
291: full = TRUE;
292:
293: vfs_buf_print((struct buf *) addr, full, db_printf);
294: }
295:
296: /*ARGSUSED*/
297: void
298: db_map_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
299: {
300: boolean_t full = FALSE;
301:
302: if (modif[0] == 'f')
303: full = TRUE;
304:
305: uvm_map_printit((struct vm_map *) addr, full, db_printf);
306: }
307:
308: /*ARGSUSED*/
309: void
310: db_malloc_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
311: {
312: #if defined(MALLOC_DEBUG)
313: extern void debug_malloc_printit(int (*)(const char *, ...), vaddr_t);
314:
315: if (!have_addr)
316: addr = 0;
317:
318: debug_malloc_printit(db_printf, (vaddr_t)addr);
319: #else
320: malloc_printit(db_printf);
321: #endif
322: }
323:
324: /*ARGSUSED*/
325: void
326: db_mount_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
327: {
328: boolean_t full = FALSE;
329:
330: if (modif[0] == 'f')
331: full = TRUE;
332:
333: vfs_mount_print((struct mount *) addr, full, db_printf);
334: }
335:
336: /*ARGSUSED*/
337: void
338: db_object_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
339: {
340: boolean_t full = FALSE;
341:
342: if (modif[0] == 'f')
343: full = TRUE;
344:
345: uvm_object_printit((struct uvm_object *) addr, full, db_printf);
346: }
347:
348: /*ARGSUSED*/
349: void
350: db_page_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
351: {
352: boolean_t full = FALSE;
353:
354: if (modif[0] == 'f')
355: full = TRUE;
356:
357: uvm_page_printit((struct vm_page *) addr, full, db_printf);
358: }
359:
360: /*ARGSUSED*/
361: void
362: db_vnode_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
363: {
364: boolean_t full = FALSE;
365:
366: if (modif[0] == 'f')
367: full = TRUE;
368:
369: vfs_vnode_print((struct vnode *) addr, full, db_printf);
370: }
371:
372: /*ARGSUSED*/
373: void
374: db_show_panic_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
375: {
376: if (panicstr)
377: db_printf("%s\n", panicstr);
378: else
379: db_printf("the kernel did not panic\n"); /* yet */
380: }
381:
382: /*ARGSUSED*/
383: void
384: db_extent_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
385: {
386: extent_print_all();
387: }
388:
389: /*ARGSUSED*/
390: void
391: db_pool_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
392: {
393: pool_printit((struct pool *)addr, modif, db_printf);
394: }
395:
396: /*ARGSUSED*/
397: void
398: db_proc_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
399: {
400: if (!have_addr)
401: addr = (db_expr_t)curproc;
402:
403: proc_printit((struct proc *)addr, modif, db_printf);
404: }
405:
406: /*ARGSUSED*/
407: void
408: db_uvmexp_print_cmd(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
409: {
410: uvmexp_print(db_printf);
411: }
412:
413: /*
414: * 'show' commands
415: */
416:
417: struct db_command db_show_all_cmds[] = {
418: { "procs", db_show_all_procs, 0, NULL },
419: { "callout", db_show_callout, 0, NULL },
420: { "pools", db_show_all_pools, 0, NULL },
421: { NULL, NULL, 0, NULL }
422: };
423:
424: struct db_command db_show_cmds[] = {
425: { "all", NULL, 0, db_show_all_cmds },
426: { "breaks", db_listbreak_cmd, 0, NULL },
427: { "buf", db_buf_print_cmd, 0, NULL },
428: { "extents", db_extent_print_cmd, 0, NULL },
429: { "malloc", db_malloc_print_cmd, 0, NULL },
430: { "map", db_map_print_cmd, 0, NULL },
431: { "mount", db_mount_print_cmd, 0, NULL },
432: { "object", db_object_print_cmd, 0, NULL },
433: { "page", db_page_print_cmd, 0, NULL },
434: { "panic", db_show_panic_cmd, 0, NULL },
435: { "pool", db_pool_print_cmd, 0, NULL },
436: { "proc", db_proc_print_cmd, 0, NULL },
437: { "registers", db_show_regs, 0, NULL },
438: { "uvmexp", db_uvmexp_print_cmd, 0, NULL },
439: { "vnode", db_vnode_print_cmd, 0, NULL },
440: { "watches", db_listwatch_cmd, 0, NULL },
441: { NULL, NULL, 0, NULL }
442: };
443:
444: struct db_command db_boot_cmds[] = {
445: { "sync", db_boot_sync_cmd, 0, 0 },
446: { "crash", db_boot_crash_cmd, 0, 0 },
447: { "dump", db_boot_dump_cmd, 0, 0 },
448: { "halt", db_boot_halt_cmd, 0, 0 },
449: { "reboot", db_boot_reboot_cmd, 0, 0 },
450: { "poweroff", db_boot_poweroff_cmd, 0, 0 },
451: { NULL, }
452: };
453:
454: struct db_command db_command_table[] = {
455: #ifdef DB_MACHINE_COMMANDS
456: /* this must be the first entry, if it exists */
457: { "machine", NULL, 0, NULL},
458: #endif
459: { "print", db_print_cmd, 0, NULL },
460: { "examine", db_examine_cmd, CS_SET_DOT, NULL },
461: { "x", db_examine_cmd, CS_SET_DOT, NULL },
462: { "search", db_search_cmd, CS_OWN|CS_SET_DOT, NULL },
463: { "set", db_set_cmd, CS_OWN, NULL },
464: { "write", db_write_cmd, CS_MORE|CS_SET_DOT, NULL },
465: { "w", db_write_cmd, CS_MORE|CS_SET_DOT, NULL },
466: { "delete", db_delete_cmd, 0, NULL },
467: { "d", db_delete_cmd, 0, NULL },
468: { "break", db_breakpoint_cmd, 0, NULL },
469: { "dwatch", db_deletewatch_cmd, 0, NULL },
470: { "watch", db_watchpoint_cmd, CS_MORE, NULL },
471: { "step", db_single_step_cmd, 0, NULL },
472: { "s", db_single_step_cmd, 0, NULL },
473: { "continue", db_continue_cmd, 0, NULL },
474: { "c", db_continue_cmd, 0, NULL },
475: { "until", db_trace_until_call_cmd,0, NULL },
476: { "next", db_trace_until_matching_cmd,0, NULL },
477: { "match", db_trace_until_matching_cmd,0, NULL },
478: { "trace", db_stack_trace_cmd, 0, NULL },
479: { "call", db_fncall, CS_OWN, NULL },
480: { "ps", db_show_all_procs, 0, NULL },
481: { "callout", db_show_callout, 0, NULL },
482: { "show", NULL, 0, db_show_cmds },
483: { "boot", NULL, 0, db_boot_cmds },
484: { "help", db_help_cmd, 0, NULL },
485: { "hangman", db_hangman, 0, NULL },
486: { "dmesg", db_dmesg_cmd, 0, NULL },
487: { NULL, NULL, 0, NULL }
488: };
489:
490: #ifdef DB_MACHINE_COMMANDS
491:
492: /* this function should be called to install the machine dependent
493: commands. It should be called before the debugger is enabled */
494: void db_machine_commands_install(struct db_command *ptr)
495: {
496: db_command_table[0].more = ptr;
497: return;
498: }
499:
500: #endif
501:
502: struct db_command *db_last_command = 0;
503:
504: void
505: db_help_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
506: {
507: db_cmd_list(db_command_table);
508: }
509:
510: void
511: db_command_loop(void)
512: {
513: label_t db_jmpbuf;
514: label_t *savejmp;
515: extern int db_output_line;
516:
517: /*
518: * Initialize 'prev' and 'next' to dot.
519: */
520: db_prev = db_dot;
521: db_next = db_dot;
522:
523: db_cmd_loop_done = 0;
524:
525: savejmp = db_recover;
526: db_recover = &db_jmpbuf;
527: (void) setjmp(&db_jmpbuf);
528:
529: while (!db_cmd_loop_done) {
530:
531: if (db_print_position() != 0)
532: db_printf("\n");
533: db_output_line = 0;
534:
535: #ifdef MULTIPROCESSOR
536: db_printf("ddb{%d}> ", CPU_INFO_UNIT(curcpu()));
537: #else
538: db_printf("ddb> ");
539: #endif
540: (void) db_read_line();
541:
542: db_command(&db_last_command, db_command_table);
543: }
544:
545: db_recover = savejmp;
546: }
547:
548: void
549: db_error(char *s)
550: {
551: if (s)
552: db_printf("%s", s);
553: db_flush_lex();
554: longjmp(db_recover);
555: }
556:
557:
558: /*
559: * Call random function:
560: * !expr(arg,arg,arg)
561: */
562: /*ARGSUSED*/
563: void
564: db_fncall(db_expr_t addr, int have_addr, db_expr_t count, char *modif)
565: {
566: db_expr_t fn_addr;
567: #define MAXARGS 11
568: db_expr_t args[MAXARGS];
569: int nargs = 0;
570: db_expr_t retval;
571: db_expr_t (*func)(db_expr_t, ...);
572: int t;
573:
574: if (!db_expression(&fn_addr)) {
575: db_printf("Bad function\n");
576: db_flush_lex();
577: return;
578: }
579: func = (db_expr_t (*)(db_expr_t, ...)) fn_addr;
580:
581: t = db_read_token();
582: if (t == tLPAREN) {
583: if (db_expression(&args[0])) {
584: nargs++;
585: while ((t = db_read_token()) == tCOMMA) {
586: if (nargs == MAXARGS) {
587: db_printf("Too many arguments\n");
588: db_flush_lex();
589: return;
590: }
591: if (!db_expression(&args[nargs])) {
592: db_printf("Argument missing\n");
593: db_flush_lex();
594: return;
595: }
596: nargs++;
597: }
598: db_unread_token(t);
599: }
600: if (db_read_token() != tRPAREN) {
601: db_printf("?\n");
602: db_flush_lex();
603: return;
604: }
605: }
606: db_skip_to_eol();
607:
608: while (nargs < MAXARGS) {
609: args[nargs++] = 0;
610: }
611:
612: retval = (*func)(args[0], args[1], args[2], args[3], args[4],
613: args[5], args[6], args[7], args[8], args[9]);
614: db_printf("%#n\n", retval);
615: }
616:
617: void
618: db_boot_sync_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
619: {
620: boot(RB_AUTOBOOT | RB_TIMEBAD | RB_USERREQ);
621: }
622:
623: void
624: db_boot_crash_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
625: {
626: boot(RB_NOSYNC | RB_DUMP | RB_TIMEBAD | RB_USERREQ);
627: }
628:
629: void
630: db_boot_dump_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
631: {
632: boot(RB_DUMP | RB_TIMEBAD | RB_USERREQ);
633: }
634:
635: void
636: db_boot_halt_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
637: {
638: boot(RB_NOSYNC | RB_HALT | RB_TIMEBAD | RB_USERREQ);
639: }
640:
641: void
642: db_boot_reboot_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
643: {
644: boot(RB_AUTOBOOT | RB_NOSYNC | RB_TIMEBAD | RB_USERREQ);
645: }
646:
647: void
648: db_boot_poweroff_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
649: {
650: boot(RB_NOSYNC | RB_HALT | RB_POWERDOWN | RB_TIMEBAD | RB_USERREQ);
651: }
652:
653: void
654: db_dmesg_cmd(db_expr_t addr, int haddr, db_expr_t count, char *modif)
655: {
656: int i, off;
657: char *p;
658:
659: if (!msgbufp || msgbufp->msg_magic != MSG_MAGIC)
660: return;
661: off = msgbufp->msg_bufx;
662: if (off > msgbufp->msg_bufs)
663: off = 0;
664: for (i = 0, p = msgbufp->msg_bufc + off;
665: i < msgbufp->msg_bufs; i++, p++) {
666: if (p >= msgbufp->msg_bufc + msgbufp->msg_bufs)
667: p = msgbufp->msg_bufc;
668: if (*p != '\0')
669: db_putchar(*p);
670: }
671: db_putchar('\n');
672: }
673:
674: void
675: db_stack_trace_cmd(db_expr_t addr, boolean_t have_addr, db_expr_t count,
676: char *modif)
677: {
678: db_stack_trace_print(addr, have_addr, count, modif, db_printf);
679: }