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1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/string.h>
16#include <linux/kernel.h>
17#include <linux/kmsg_dump.h>
18#include <linux/reboot.h>
19#include <linux/sched.h>
20#include <linux/sysrq.h>
21#include <linux/smp.h>
22#include <linux/utsname.h>
23#include <linux/vmalloc.h>
24#include <linux/atomic.h>
25#include <linux/module.h>
26#include <linux/mm.h>
27#include <linux/init.h>
28#include <linux/kallsyms.h>
29#include <linux/kgdb.h>
30#include <linux/kdb.h>
31#include <linux/notifier.h>
32#include <linux/interrupt.h>
33#include <linux/delay.h>
34#include <linux/nmi.h>
35#include <linux/time.h>
36#include <linux/ptrace.h>
37#include <linux/sysctl.h>
38#include <linux/cpu.h>
39#include <linux/kdebug.h>
40#include <linux/proc_fs.h>
41#include <linux/uaccess.h>
42#include <linux/slab.h>
43#include "kdb_private.h"
44
45#define GREP_LEN 256
46char kdb_grep_string[GREP_LEN];
47int kdb_grepping_flag;
48EXPORT_SYMBOL(kdb_grepping_flag);
49int kdb_grep_leading;
50int kdb_grep_trailing;
51
52/*
53 * Kernel debugger state flags
54 */
55int kdb_flags;
56atomic_t kdb_event;
57
58/*
59 * kdb_lock protects updates to kdb_initial_cpu. Used to
60 * single thread processors through the kernel debugger.
61 */
62int kdb_initial_cpu = -1; /* cpu number that owns kdb */
63int kdb_nextline = 1;
64int kdb_state; /* General KDB state */
65
66struct task_struct *kdb_current_task;
67EXPORT_SYMBOL(kdb_current_task);
68struct pt_regs *kdb_current_regs;
69
70const char *kdb_diemsg;
71static int kdb_go_count;
72#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
73static unsigned int kdb_continue_catastrophic =
74 CONFIG_KDB_CONTINUE_CATASTROPHIC;
75#else
76static unsigned int kdb_continue_catastrophic;
77#endif
78
79/* kdb_commands describes the available commands. */
80static kdbtab_t *kdb_commands;
81#define KDB_BASE_CMD_MAX 50
82static int kdb_max_commands = KDB_BASE_CMD_MAX;
83static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
84#define for_each_kdbcmd(cmd, num) \
85 for ((cmd) = kdb_base_commands, (num) = 0; \
86 num < kdb_max_commands; \
87 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
88
89typedef struct _kdbmsg {
90 int km_diag; /* kdb diagnostic */
91 char *km_msg; /* Corresponding message text */
92} kdbmsg_t;
93
94#define KDBMSG(msgnum, text) \
95 { KDB_##msgnum, text }
96
97static kdbmsg_t kdbmsgs[] = {
98 KDBMSG(NOTFOUND, "Command Not Found"),
99 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
100 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
101 "8 is only allowed on 64 bit systems"),
102 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
103 KDBMSG(NOTENV, "Cannot find environment variable"),
104 KDBMSG(NOENVVALUE, "Environment variable should have value"),
105 KDBMSG(NOTIMP, "Command not implemented"),
106 KDBMSG(ENVFULL, "Environment full"),
107 KDBMSG(ENVBUFFULL, "Environment buffer full"),
108 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
109#ifdef CONFIG_CPU_XSCALE
110 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
111#else
112 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
113#endif
114 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
115 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
116 KDBMSG(BADMODE, "Invalid IDMODE"),
117 KDBMSG(BADINT, "Illegal numeric value"),
118 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
119 KDBMSG(BADREG, "Invalid register name"),
120 KDBMSG(BADCPUNUM, "Invalid cpu number"),
121 KDBMSG(BADLENGTH, "Invalid length field"),
122 KDBMSG(NOBP, "No Breakpoint exists"),
123 KDBMSG(BADADDR, "Invalid address"),
124};
125#undef KDBMSG
126
127static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
128
129
130/*
131 * Initial environment. This is all kept static and local to
132 * this file. We don't want to rely on the memory allocation
133 * mechanisms in the kernel, so we use a very limited allocate-only
134 * heap for new and altered environment variables. The entire
135 * environment is limited to a fixed number of entries (add more
136 * to __env[] if required) and a fixed amount of heap (add more to
137 * KDB_ENVBUFSIZE if required).
138 */
139
140static char *__env[] = {
141#if defined(CONFIG_SMP)
142 "PROMPT=[%d]kdb> ",
143#else
144 "PROMPT=kdb> ",
145#endif
146 "MOREPROMPT=more> ",
147 "RADIX=16",
148 "MDCOUNT=8", /* lines of md output */
149 KDB_PLATFORM_ENV,
150 "DTABCOUNT=30",
151 "NOSECT=1",
152 (char *)0,
153 (char *)0,
154 (char *)0,
155 (char *)0,
156 (char *)0,
157 (char *)0,
158 (char *)0,
159 (char *)0,
160 (char *)0,
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176};
177
178static const int __nenv = ARRAY_SIZE(__env);
179
180struct task_struct *kdb_curr_task(int cpu)
181{
182 struct task_struct *p = curr_task(cpu);
183#ifdef _TIF_MCA_INIT
184 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
185 p = krp->p;
186#endif
187 return p;
188}
189
190/*
191 * kdbgetenv - This function will return the character string value of
192 * an environment variable.
193 * Parameters:
194 * match A character string representing an environment variable.
195 * Returns:
196 * NULL No environment variable matches 'match'
197 * char* Pointer to string value of environment variable.
198 */
199char *kdbgetenv(const char *match)
200{
201 char **ep = __env;
202 int matchlen = strlen(match);
203 int i;
204
205 for (i = 0; i < __nenv; i++) {
206 char *e = *ep++;
207
208 if (!e)
209 continue;
210
211 if ((strncmp(match, e, matchlen) == 0)
212 && ((e[matchlen] == '\0')
213 || (e[matchlen] == '='))) {
214 char *cp = strchr(e, '=');
215 return cp ? ++cp : "";
216 }
217 }
218 return NULL;
219}
220
221/*
222 * kdballocenv - This function is used to allocate bytes for
223 * environment entries.
224 * Parameters:
225 * match A character string representing a numeric value
226 * Outputs:
227 * *value the unsigned long representation of the env variable 'match'
228 * Returns:
229 * Zero on success, a kdb diagnostic on failure.
230 * Remarks:
231 * We use a static environment buffer (envbuffer) to hold the values
232 * of dynamically generated environment variables (see kdb_set). Buffer
233 * space once allocated is never free'd, so over time, the amount of space
234 * (currently 512 bytes) will be exhausted if env variables are changed
235 * frequently.
236 */
237static char *kdballocenv(size_t bytes)
238{
239#define KDB_ENVBUFSIZE 512
240 static char envbuffer[KDB_ENVBUFSIZE];
241 static int envbufsize;
242 char *ep = NULL;
243
244 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
245 ep = &envbuffer[envbufsize];
246 envbufsize += bytes;
247 }
248 return ep;
249}
250
251/*
252 * kdbgetulenv - This function will return the value of an unsigned
253 * long-valued environment variable.
254 * Parameters:
255 * match A character string representing a numeric value
256 * Outputs:
257 * *value the unsigned long represntation of the env variable 'match'
258 * Returns:
259 * Zero on success, a kdb diagnostic on failure.
260 */
261static int kdbgetulenv(const char *match, unsigned long *value)
262{
263 char *ep;
264
265 ep = kdbgetenv(match);
266 if (!ep)
267 return KDB_NOTENV;
268 if (strlen(ep) == 0)
269 return KDB_NOENVVALUE;
270
271 *value = simple_strtoul(ep, NULL, 0);
272
273 return 0;
274}
275
276/*
277 * kdbgetintenv - This function will return the value of an
278 * integer-valued environment variable.
279 * Parameters:
280 * match A character string representing an integer-valued env variable
281 * Outputs:
282 * *value the integer representation of the environment variable 'match'
283 * Returns:
284 * Zero on success, a kdb diagnostic on failure.
285 */
286int kdbgetintenv(const char *match, int *value)
287{
288 unsigned long val;
289 int diag;
290
291 diag = kdbgetulenv(match, &val);
292 if (!diag)
293 *value = (int) val;
294 return diag;
295}
296
297/*
298 * kdbgetularg - This function will convert a numeric string into an
299 * unsigned long value.
300 * Parameters:
301 * arg A character string representing a numeric value
302 * Outputs:
303 * *value the unsigned long represntation of arg.
304 * Returns:
305 * Zero on success, a kdb diagnostic on failure.
306 */
307int kdbgetularg(const char *arg, unsigned long *value)
308{
309 char *endp;
310 unsigned long val;
311
312 val = simple_strtoul(arg, &endp, 0);
313
314 if (endp == arg) {
315 /*
316 * Also try base 16, for us folks too lazy to type the
317 * leading 0x...
318 */
319 val = simple_strtoul(arg, &endp, 16);
320 if (endp == arg)
321 return KDB_BADINT;
322 }
323
324 *value = val;
325
326 return 0;
327}
328
329int kdbgetu64arg(const char *arg, u64 *value)
330{
331 char *endp;
332 u64 val;
333
334 val = simple_strtoull(arg, &endp, 0);
335
336 if (endp == arg) {
337
338 val = simple_strtoull(arg, &endp, 16);
339 if (endp == arg)
340 return KDB_BADINT;
341 }
342
343 *value = val;
344
345 return 0;
346}
347
348/*
349 * kdb_set - This function implements the 'set' command. Alter an
350 * existing environment variable or create a new one.
351 */
352int kdb_set(int argc, const char **argv)
353{
354 int i;
355 char *ep;
356 size_t varlen, vallen;
357
358 /*
359 * we can be invoked two ways:
360 * set var=value argv[1]="var", argv[2]="value"
361 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
362 * - if the latter, shift 'em down.
363 */
364 if (argc == 3) {
365 argv[2] = argv[3];
366 argc--;
367 }
368
369 if (argc != 2)
370 return KDB_ARGCOUNT;
371
372 /*
373 * Check for internal variables
374 */
375 if (strcmp(argv[1], "KDBDEBUG") == 0) {
376 unsigned int debugflags;
377 char *cp;
378
379 debugflags = simple_strtoul(argv[2], &cp, 0);
380 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
381 kdb_printf("kdb: illegal debug flags '%s'\n",
382 argv[2]);
383 return 0;
384 }
385 kdb_flags = (kdb_flags &
386 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
387 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
388
389 return 0;
390 }
391
392 /*
393 * Tokenizer squashed the '=' sign. argv[1] is variable
394 * name, argv[2] = value.
395 */
396 varlen = strlen(argv[1]);
397 vallen = strlen(argv[2]);
398 ep = kdballocenv(varlen + vallen + 2);
399 if (ep == (char *)0)
400 return KDB_ENVBUFFULL;
401
402 sprintf(ep, "%s=%s", argv[1], argv[2]);
403
404 ep[varlen+vallen+1] = '\0';
405
406 for (i = 0; i < __nenv; i++) {
407 if (__env[i]
408 && ((strncmp(__env[i], argv[1], varlen) == 0)
409 && ((__env[i][varlen] == '\0')
410 || (__env[i][varlen] == '=')))) {
411 __env[i] = ep;
412 return 0;
413 }
414 }
415
416 /*
417 * Wasn't existing variable. Fit into slot.
418 */
419 for (i = 0; i < __nenv-1; i++) {
420 if (__env[i] == (char *)0) {
421 __env[i] = ep;
422 return 0;
423 }
424 }
425
426 return KDB_ENVFULL;
427}
428
429static int kdb_check_regs(void)
430{
431 if (!kdb_current_regs) {
432 kdb_printf("No current kdb registers."
433 " You may need to select another task\n");
434 return KDB_BADREG;
435 }
436 return 0;
437}
438
439/*
440 * kdbgetaddrarg - This function is responsible for parsing an
441 * address-expression and returning the value of the expression,
442 * symbol name, and offset to the caller.
443 *
444 * The argument may consist of a numeric value (decimal or
445 * hexidecimal), a symbol name, a register name (preceded by the
446 * percent sign), an environment variable with a numeric value
447 * (preceded by a dollar sign) or a simple arithmetic expression
448 * consisting of a symbol name, +/-, and a numeric constant value
449 * (offset).
450 * Parameters:
451 * argc - count of arguments in argv
452 * argv - argument vector
453 * *nextarg - index to next unparsed argument in argv[]
454 * regs - Register state at time of KDB entry
455 * Outputs:
456 * *value - receives the value of the address-expression
457 * *offset - receives the offset specified, if any
458 * *name - receives the symbol name, if any
459 * *nextarg - index to next unparsed argument in argv[]
460 * Returns:
461 * zero is returned on success, a kdb diagnostic code is
462 * returned on error.
463 */
464int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
465 unsigned long *value, long *offset,
466 char **name)
467{
468 unsigned long addr;
469 unsigned long off = 0;
470 int positive;
471 int diag;
472 int found = 0;
473 char *symname;
474 char symbol = '\0';
475 char *cp;
476 kdb_symtab_t symtab;
477
478 /*
479 * Process arguments which follow the following syntax:
480 *
481 * symbol | numeric-address [+/- numeric-offset]
482 * %register
483 * $environment-variable
484 */
485
486 if (*nextarg > argc)
487 return KDB_ARGCOUNT;
488
489 symname = (char *)argv[*nextarg];
490
491 /*
492 * If there is no whitespace between the symbol
493 * or address and the '+' or '-' symbols, we
494 * remember the character and replace it with a
495 * null so the symbol/value can be properly parsed
496 */
497 cp = strpbrk(symname, "+-");
498 if (cp != NULL) {
499 symbol = *cp;
500 *cp++ = '\0';
501 }
502
503 if (symname[0] == '$') {
504 diag = kdbgetulenv(&symname[1], &addr);
505 if (diag)
506 return diag;
507 } else if (symname[0] == '%') {
508 diag = kdb_check_regs();
509 if (diag)
510 return diag;
511 /* Implement register values with % at a later time as it is
512 * arch optional.
513 */
514 return KDB_NOTIMP;
515 } else {
516 found = kdbgetsymval(symname, &symtab);
517 if (found) {
518 addr = symtab.sym_start;
519 } else {
520 diag = kdbgetularg(argv[*nextarg], &addr);
521 if (diag)
522 return diag;
523 }
524 }
525
526 if (!found)
527 found = kdbnearsym(addr, &symtab);
528
529 (*nextarg)++;
530
531 if (name)
532 *name = symname;
533 if (value)
534 *value = addr;
535 if (offset && name && *name)
536 *offset = addr - symtab.sym_start;
537
538 if ((*nextarg > argc)
539 && (symbol == '\0'))
540 return 0;
541
542 /*
543 * check for +/- and offset
544 */
545
546 if (symbol == '\0') {
547 if ((argv[*nextarg][0] != '+')
548 && (argv[*nextarg][0] != '-')) {
549 /*
550 * Not our argument. Return.
551 */
552 return 0;
553 } else {
554 positive = (argv[*nextarg][0] == '+');
555 (*nextarg)++;
556 }
557 } else
558 positive = (symbol == '+');
559
560 /*
561 * Now there must be an offset!
562 */
563 if ((*nextarg > argc)
564 && (symbol == '\0')) {
565 return KDB_INVADDRFMT;
566 }
567
568 if (!symbol) {
569 cp = (char *)argv[*nextarg];
570 (*nextarg)++;
571 }
572
573 diag = kdbgetularg(cp, &off);
574 if (diag)
575 return diag;
576
577 if (!positive)
578 off = -off;
579
580 if (offset)
581 *offset += off;
582
583 if (value)
584 *value += off;
585
586 return 0;
587}
588
589static void kdb_cmderror(int diag)
590{
591 int i;
592
593 if (diag >= 0) {
594 kdb_printf("no error detected (diagnostic is %d)\n", diag);
595 return;
596 }
597
598 for (i = 0; i < __nkdb_err; i++) {
599 if (kdbmsgs[i].km_diag == diag) {
600 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
601 return;
602 }
603 }
604
605 kdb_printf("Unknown diag %d\n", -diag);
606}
607
608/*
609 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
610 * command which defines one command as a set of other commands,
611 * terminated by endefcmd. kdb_defcmd processes the initial
612 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
613 * the following commands until 'endefcmd'.
614 * Inputs:
615 * argc argument count
616 * argv argument vector
617 * Returns:
618 * zero for success, a kdb diagnostic if error
619 */
620struct defcmd_set {
621 int count;
622 int usable;
623 char *name;
624 char *usage;
625 char *help;
626 char **command;
627};
628static struct defcmd_set *defcmd_set;
629static int defcmd_set_count;
630static int defcmd_in_progress;
631
632/* Forward references */
633static int kdb_exec_defcmd(int argc, const char **argv);
634
635static int kdb_defcmd2(const char *cmdstr, const char *argv0)
636{
637 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
638 char **save_command = s->command;
639 if (strcmp(argv0, "endefcmd") == 0) {
640 defcmd_in_progress = 0;
641 if (!s->count)
642 s->usable = 0;
643 if (s->usable)
644 kdb_register(s->name, kdb_exec_defcmd,
645 s->usage, s->help, 0);
646 return 0;
647 }
648 if (!s->usable)
649 return KDB_NOTIMP;
650 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
651 if (!s->command) {
652 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
653 cmdstr);
654 s->usable = 0;
655 return KDB_NOTIMP;
656 }
657 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
658 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
659 kfree(save_command);
660 return 0;
661}
662
663static int kdb_defcmd(int argc, const char **argv)
664{
665 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
666 if (defcmd_in_progress) {
667 kdb_printf("kdb: nested defcmd detected, assuming missing "
668 "endefcmd\n");
669 kdb_defcmd2("endefcmd", "endefcmd");
670 }
671 if (argc == 0) {
672 int i;
673 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
674 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
675 s->usage, s->help);
676 for (i = 0; i < s->count; ++i)
677 kdb_printf("%s", s->command[i]);
678 kdb_printf("endefcmd\n");
679 }
680 return 0;
681 }
682 if (argc != 3)
683 return KDB_ARGCOUNT;
684 if (in_dbg_master()) {
685 kdb_printf("Command only available during kdb_init()\n");
686 return KDB_NOTIMP;
687 }
688 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
689 GFP_KDB);
690 if (!defcmd_set)
691 goto fail_defcmd;
692 memcpy(defcmd_set, save_defcmd_set,
693 defcmd_set_count * sizeof(*defcmd_set));
694 s = defcmd_set + defcmd_set_count;
695 memset(s, 0, sizeof(*s));
696 s->usable = 1;
697 s->name = kdb_strdup(argv[1], GFP_KDB);
698 if (!s->name)
699 goto fail_name;
700 s->usage = kdb_strdup(argv[2], GFP_KDB);
701 if (!s->usage)
702 goto fail_usage;
703 s->help = kdb_strdup(argv[3], GFP_KDB);
704 if (!s->help)
705 goto fail_help;
706 if (s->usage[0] == '"') {
707 strcpy(s->usage, argv[2]+1);
708 s->usage[strlen(s->usage)-1] = '\0';
709 }
710 if (s->help[0] == '"') {
711 strcpy(s->help, argv[3]+1);
712 s->help[strlen(s->help)-1] = '\0';
713 }
714 ++defcmd_set_count;
715 defcmd_in_progress = 1;
716 kfree(save_defcmd_set);
717 return 0;
718fail_help:
719 kfree(s->usage);
720fail_usage:
721 kfree(s->name);
722fail_name:
723 kfree(defcmd_set);
724fail_defcmd:
725 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
726 defcmd_set = save_defcmd_set;
727 return KDB_NOTIMP;
728}
729
730/*
731 * kdb_exec_defcmd - Execute the set of commands associated with this
732 * defcmd name.
733 * Inputs:
734 * argc argument count
735 * argv argument vector
736 * Returns:
737 * zero for success, a kdb diagnostic if error
738 */
739static int kdb_exec_defcmd(int argc, const char **argv)
740{
741 int i, ret;
742 struct defcmd_set *s;
743 if (argc != 0)
744 return KDB_ARGCOUNT;
745 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
746 if (strcmp(s->name, argv[0]) == 0)
747 break;
748 }
749 if (i == defcmd_set_count) {
750 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
751 argv[0]);
752 return KDB_NOTIMP;
753 }
754 for (i = 0; i < s->count; ++i) {
755 /* Recursive use of kdb_parse, do not use argv after
756 * this point */
757 argv = NULL;
758 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
759 ret = kdb_parse(s->command[i]);
760 if (ret)
761 return ret;
762 }
763 return 0;
764}
765
766/* Command history */
767#define KDB_CMD_HISTORY_COUNT 32
768#define CMD_BUFLEN 200 /* kdb_printf: max printline
769 * size == 256 */
770static unsigned int cmd_head, cmd_tail;
771static unsigned int cmdptr;
772static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
773static char cmd_cur[CMD_BUFLEN];
774
775/*
776 * The "str" argument may point to something like | grep xyz
777 */
778static void parse_grep(const char *str)
779{
780 int len;
781 char *cp = (char *)str, *cp2;
782
783 /* sanity check: we should have been called with the \ first */
784 if (*cp != '|')
785 return;
786 cp++;
787 while (isspace(*cp))
788 cp++;
789 if (strncmp(cp, "grep ", 5)) {
790 kdb_printf("invalid 'pipe', see grephelp\n");
791 return;
792 }
793 cp += 5;
794 while (isspace(*cp))
795 cp++;
796 cp2 = strchr(cp, '\n');
797 if (cp2)
798 *cp2 = '\0'; /* remove the trailing newline */
799 len = strlen(cp);
800 if (len == 0) {
801 kdb_printf("invalid 'pipe', see grephelp\n");
802 return;
803 }
804 /* now cp points to a nonzero length search string */
805 if (*cp == '"') {
806 /* allow it be "x y z" by removing the "'s - there must
807 be two of them */
808 cp++;
809 cp2 = strchr(cp, '"');
810 if (!cp2) {
811 kdb_printf("invalid quoted string, see grephelp\n");
812 return;
813 }
814 *cp2 = '\0'; /* end the string where the 2nd " was */
815 }
816 kdb_grep_leading = 0;
817 if (*cp == '^') {
818 kdb_grep_leading = 1;
819 cp++;
820 }
821 len = strlen(cp);
822 kdb_grep_trailing = 0;
823 if (*(cp+len-1) == '$') {
824 kdb_grep_trailing = 1;
825 *(cp+len-1) = '\0';
826 }
827 len = strlen(cp);
828 if (!len)
829 return;
830 if (len >= GREP_LEN) {
831 kdb_printf("search string too long\n");
832 return;
833 }
834 strcpy(kdb_grep_string, cp);
835 kdb_grepping_flag++;
836 return;
837}
838
839/*
840 * kdb_parse - Parse the command line, search the command table for a
841 * matching command and invoke the command function. This
842 * function may be called recursively, if it is, the second call
843 * will overwrite argv and cbuf. It is the caller's
844 * responsibility to save their argv if they recursively call
845 * kdb_parse().
846 * Parameters:
847 * cmdstr The input command line to be parsed.
848 * regs The registers at the time kdb was entered.
849 * Returns:
850 * Zero for success, a kdb diagnostic if failure.
851 * Remarks:
852 * Limited to 20 tokens.
853 *
854 * Real rudimentary tokenization. Basically only whitespace
855 * is considered a token delimeter (but special consideration
856 * is taken of the '=' sign as used by the 'set' command).
857 *
858 * The algorithm used to tokenize the input string relies on
859 * there being at least one whitespace (or otherwise useless)
860 * character between tokens as the character immediately following
861 * the token is altered in-place to a null-byte to terminate the
862 * token string.
863 */
864
865#define MAXARGC 20
866
867int kdb_parse(const char *cmdstr)
868{
869 static char *argv[MAXARGC];
870 static int argc;
871 static char cbuf[CMD_BUFLEN+2];
872 char *cp;
873 char *cpp, quoted;
874 kdbtab_t *tp;
875 int i, escaped, ignore_errors = 0, check_grep;
876
877 /*
878 * First tokenize the command string.
879 */
880 cp = (char *)cmdstr;
881 kdb_grepping_flag = check_grep = 0;
882
883 if (KDB_FLAG(CMD_INTERRUPT)) {
884 /* Previous command was interrupted, newline must not
885 * repeat the command */
886 KDB_FLAG_CLEAR(CMD_INTERRUPT);
887 KDB_STATE_SET(PAGER);
888 argc = 0; /* no repeat */
889 }
890
891 if (*cp != '\n' && *cp != '\0') {
892 argc = 0;
893 cpp = cbuf;
894 while (*cp) {
895 /* skip whitespace */
896 while (isspace(*cp))
897 cp++;
898 if ((*cp == '\0') || (*cp == '\n') ||
899 (*cp == '#' && !defcmd_in_progress))
900 break;
901 /* special case: check for | grep pattern */
902 if (*cp == '|') {
903 check_grep++;
904 break;
905 }
906 if (cpp >= cbuf + CMD_BUFLEN) {
907 kdb_printf("kdb_parse: command buffer "
908 "overflow, command ignored\n%s\n",
909 cmdstr);
910 return KDB_NOTFOUND;
911 }
912 if (argc >= MAXARGC - 1) {
913 kdb_printf("kdb_parse: too many arguments, "
914 "command ignored\n%s\n", cmdstr);
915 return KDB_NOTFOUND;
916 }
917 argv[argc++] = cpp;
918 escaped = 0;
919 quoted = '\0';
920 /* Copy to next unquoted and unescaped
921 * whitespace or '=' */
922 while (*cp && *cp != '\n' &&
923 (escaped || quoted || !isspace(*cp))) {
924 if (cpp >= cbuf + CMD_BUFLEN)
925 break;
926 if (escaped) {
927 escaped = 0;
928 *cpp++ = *cp++;
929 continue;
930 }
931 if (*cp == '\\') {
932 escaped = 1;
933 ++cp;
934 continue;
935 }
936 if (*cp == quoted)
937 quoted = '\0';
938 else if (*cp == '\'' || *cp == '"')
939 quoted = *cp;
940 *cpp = *cp++;
941 if (*cpp == '=' && !quoted)
942 break;
943 ++cpp;
944 }
945 *cpp++ = '\0'; /* Squash a ws or '=' character */
946 }
947 }
948 if (!argc)
949 return 0;
950 if (check_grep)
951 parse_grep(cp);
952 if (defcmd_in_progress) {
953 int result = kdb_defcmd2(cmdstr, argv[0]);
954 if (!defcmd_in_progress) {
955 argc = 0; /* avoid repeat on endefcmd */
956 *(argv[0]) = '\0';
957 }
958 return result;
959 }
960 if (argv[0][0] == '-' && argv[0][1] &&
961 (argv[0][1] < '0' || argv[0][1] > '9')) {
962 ignore_errors = 1;
963 ++argv[0];
964 }
965
966 for_each_kdbcmd(tp, i) {
967 if (tp->cmd_name) {
968 /*
969 * If this command is allowed to be abbreviated,
970 * check to see if this is it.
971 */
972
973 if (tp->cmd_minlen
974 && (strlen(argv[0]) <= tp->cmd_minlen)) {
975 if (strncmp(argv[0],
976 tp->cmd_name,
977 tp->cmd_minlen) == 0) {
978 break;
979 }
980 }
981
982 if (strcmp(argv[0], tp->cmd_name) == 0)
983 break;
984 }
985 }
986
987 /*
988 * If we don't find a command by this name, see if the first
989 * few characters of this match any of the known commands.
990 * e.g., md1c20 should match md.
991 */
992 if (i == kdb_max_commands) {
993 for_each_kdbcmd(tp, i) {
994 if (tp->cmd_name) {
995 if (strncmp(argv[0],
996 tp->cmd_name,
997 strlen(tp->cmd_name)) == 0) {
998 break;
999 }
1000 }
1001 }
1002 }
1003
1004 if (i < kdb_max_commands) {
1005 int result;
1006 KDB_STATE_SET(CMD);
1007 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1008 if (result && ignore_errors && result > KDB_CMD_GO)
1009 result = 0;
1010 KDB_STATE_CLEAR(CMD);
1011 switch (tp->cmd_repeat) {
1012 case KDB_REPEAT_NONE:
1013 argc = 0;
1014 if (argv[0])
1015 *(argv[0]) = '\0';
1016 break;
1017 case KDB_REPEAT_NO_ARGS:
1018 argc = 1;
1019 if (argv[1])
1020 *(argv[1]) = '\0';
1021 break;
1022 case KDB_REPEAT_WITH_ARGS:
1023 break;
1024 }
1025 return result;
1026 }
1027
1028 /*
1029 * If the input with which we were presented does not
1030 * map to an existing command, attempt to parse it as an
1031 * address argument and display the result. Useful for
1032 * obtaining the address of a variable, or the nearest symbol
1033 * to an address contained in a register.
1034 */
1035 {
1036 unsigned long value;
1037 char *name = NULL;
1038 long offset;
1039 int nextarg = 0;
1040
1041 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1042 &value, &offset, &name)) {
1043 return KDB_NOTFOUND;
1044 }
1045
1046 kdb_printf("%s = ", argv[0]);
1047 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1048 kdb_printf("\n");
1049 return 0;
1050 }
1051}
1052
1053
1054static int handle_ctrl_cmd(char *cmd)
1055{
1056#define CTRL_P 16
1057#define CTRL_N 14
1058
1059 /* initial situation */
1060 if (cmd_head == cmd_tail)
1061 return 0;
1062 switch (*cmd) {
1063 case CTRL_P:
1064 if (cmdptr != cmd_tail)
1065 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1066 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1067 return 1;
1068 case CTRL_N:
1069 if (cmdptr != cmd_head)
1070 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1071 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1072 return 1;
1073 }
1074 return 0;
1075}
1076
1077/*
1078 * kdb_reboot - This function implements the 'reboot' command. Reboot
1079 * the system immediately, or loop for ever on failure.
1080 */
1081static int kdb_reboot(int argc, const char **argv)
1082{
1083 emergency_restart();
1084 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1085 while (1)
1086 cpu_relax();
1087 /* NOTREACHED */
1088 return 0;
1089}
1090
1091static void kdb_dumpregs(struct pt_regs *regs)
1092{
1093 int old_lvl = console_loglevel;
1094 console_loglevel = 15;
1095 kdb_trap_printk++;
1096 show_regs(regs);
1097 kdb_trap_printk--;
1098 kdb_printf("\n");
1099 console_loglevel = old_lvl;
1100}
1101
1102void kdb_set_current_task(struct task_struct *p)
1103{
1104 kdb_current_task = p;
1105
1106 if (kdb_task_has_cpu(p)) {
1107 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1108 return;
1109 }
1110 kdb_current_regs = NULL;
1111}
1112
1113/*
1114 * kdb_local - The main code for kdb. This routine is invoked on a
1115 * specific processor, it is not global. The main kdb() routine
1116 * ensures that only one processor at a time is in this routine.
1117 * This code is called with the real reason code on the first
1118 * entry to a kdb session, thereafter it is called with reason
1119 * SWITCH, even if the user goes back to the original cpu.
1120 * Inputs:
1121 * reason The reason KDB was invoked
1122 * error The hardware-defined error code
1123 * regs The exception frame at time of fault/breakpoint.
1124 * db_result Result code from the break or debug point.
1125 * Returns:
1126 * 0 KDB was invoked for an event which it wasn't responsible
1127 * 1 KDB handled the event for which it was invoked.
1128 * KDB_CMD_GO User typed 'go'.
1129 * KDB_CMD_CPU User switched to another cpu.
1130 * KDB_CMD_SS Single step.
1131 */
1132static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1133 kdb_dbtrap_t db_result)
1134{
1135 char *cmdbuf;
1136 int diag;
1137 struct task_struct *kdb_current =
1138 kdb_curr_task(raw_smp_processor_id());
1139
1140 KDB_DEBUG_STATE("kdb_local 1", reason);
1141 kdb_go_count = 0;
1142 if (reason == KDB_REASON_DEBUG) {
1143 /* special case below */
1144 } else {
1145 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1146 kdb_current, kdb_current ? kdb_current->pid : 0);
1147#if defined(CONFIG_SMP)
1148 kdb_printf("on processor %d ", raw_smp_processor_id());
1149#endif
1150 }
1151
1152 switch (reason) {
1153 case KDB_REASON_DEBUG:
1154 {
1155 /*
1156 * If re-entering kdb after a single step
1157 * command, don't print the message.
1158 */
1159 switch (db_result) {
1160 case KDB_DB_BPT:
1161 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1162 kdb_current, kdb_current->pid);
1163#if defined(CONFIG_SMP)
1164 kdb_printf("on processor %d ", raw_smp_processor_id());
1165#endif
1166 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1167 instruction_pointer(regs));
1168 break;
1169 case KDB_DB_SS:
1170 break;
1171 case KDB_DB_SSBPT:
1172 KDB_DEBUG_STATE("kdb_local 4", reason);
1173 return 1; /* kdba_db_trap did the work */
1174 default:
1175 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1176 db_result);
1177 break;
1178 }
1179
1180 }
1181 break;
1182 case KDB_REASON_ENTER:
1183 if (KDB_STATE(KEYBOARD))
1184 kdb_printf("due to Keyboard Entry\n");
1185 else
1186 kdb_printf("due to KDB_ENTER()\n");
1187 break;
1188 case KDB_REASON_KEYBOARD:
1189 KDB_STATE_SET(KEYBOARD);
1190 kdb_printf("due to Keyboard Entry\n");
1191 break;
1192 case KDB_REASON_ENTER_SLAVE:
1193 /* drop through, slaves only get released via cpu switch */
1194 case KDB_REASON_SWITCH:
1195 kdb_printf("due to cpu switch\n");
1196 break;
1197 case KDB_REASON_OOPS:
1198 kdb_printf("Oops: %s\n", kdb_diemsg);
1199 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1200 instruction_pointer(regs));
1201 kdb_dumpregs(regs);
1202 break;
1203 case KDB_REASON_SYSTEM_NMI:
1204 kdb_printf("due to System NonMaskable Interrupt\n");
1205 break;
1206 case KDB_REASON_NMI:
1207 kdb_printf("due to NonMaskable Interrupt @ "
1208 kdb_machreg_fmt "\n",
1209 instruction_pointer(regs));
1210 kdb_dumpregs(regs);
1211 break;
1212 case KDB_REASON_SSTEP:
1213 case KDB_REASON_BREAK:
1214 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1215 reason == KDB_REASON_BREAK ?
1216 "Breakpoint" : "SS trap", instruction_pointer(regs));
1217 /*
1218 * Determine if this breakpoint is one that we
1219 * are interested in.
1220 */
1221 if (db_result != KDB_DB_BPT) {
1222 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1223 db_result);
1224 KDB_DEBUG_STATE("kdb_local 6", reason);
1225 return 0; /* Not for us, dismiss it */
1226 }
1227 break;
1228 case KDB_REASON_RECURSE:
1229 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1230 instruction_pointer(regs));
1231 break;
1232 default:
1233 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1234 KDB_DEBUG_STATE("kdb_local 8", reason);
1235 return 0; /* Not for us, dismiss it */
1236 }
1237
1238 while (1) {
1239 /*
1240 * Initialize pager context.
1241 */
1242 kdb_nextline = 1;
1243 KDB_STATE_CLEAR(SUPPRESS);
1244
1245 cmdbuf = cmd_cur;
1246 *cmdbuf = '\0';
1247 *(cmd_hist[cmd_head]) = '\0';
1248
1249do_full_getstr:
1250#if defined(CONFIG_SMP)
1251 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1252 raw_smp_processor_id());
1253#else
1254 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1255#endif
1256 if (defcmd_in_progress)
1257 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1258
1259 /*
1260 * Fetch command from keyboard
1261 */
1262 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1263 if (*cmdbuf != '\n') {
1264 if (*cmdbuf < 32) {
1265 if (cmdptr == cmd_head) {
1266 strncpy(cmd_hist[cmd_head], cmd_cur,
1267 CMD_BUFLEN);
1268 *(cmd_hist[cmd_head] +
1269 strlen(cmd_hist[cmd_head])-1) = '\0';
1270 }
1271 if (!handle_ctrl_cmd(cmdbuf))
1272 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1273 cmdbuf = cmd_cur;
1274 goto do_full_getstr;
1275 } else {
1276 strncpy(cmd_hist[cmd_head], cmd_cur,
1277 CMD_BUFLEN);
1278 }
1279
1280 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1281 if (cmd_head == cmd_tail)
1282 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1283 }
1284
1285 cmdptr = cmd_head;
1286 diag = kdb_parse(cmdbuf);
1287 if (diag == KDB_NOTFOUND) {
1288 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1289 diag = 0;
1290 }
1291 if (diag == KDB_CMD_GO
1292 || diag == KDB_CMD_CPU
1293 || diag == KDB_CMD_SS
1294 || diag == KDB_CMD_KGDB)
1295 break;
1296
1297 if (diag)
1298 kdb_cmderror(diag);
1299 }
1300 KDB_DEBUG_STATE("kdb_local 9", diag);
1301 return diag;
1302}
1303
1304
1305/*
1306 * kdb_print_state - Print the state data for the current processor
1307 * for debugging.
1308 * Inputs:
1309 * text Identifies the debug point
1310 * value Any integer value to be printed, e.g. reason code.
1311 */
1312void kdb_print_state(const char *text, int value)
1313{
1314 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1315 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1316 kdb_state);
1317}
1318
1319/*
1320 * kdb_main_loop - After initial setup and assignment of the
1321 * controlling cpu, all cpus are in this loop. One cpu is in
1322 * control and will issue the kdb prompt, the others will spin
1323 * until 'go' or cpu switch.
1324 *
1325 * To get a consistent view of the kernel stacks for all
1326 * processes, this routine is invoked from the main kdb code via
1327 * an architecture specific routine. kdba_main_loop is
1328 * responsible for making the kernel stacks consistent for all
1329 * processes, there should be no difference between a blocked
1330 * process and a running process as far as kdb is concerned.
1331 * Inputs:
1332 * reason The reason KDB was invoked
1333 * error The hardware-defined error code
1334 * reason2 kdb's current reason code.
1335 * Initially error but can change
1336 * according to kdb state.
1337 * db_result Result code from break or debug point.
1338 * regs The exception frame at time of fault/breakpoint.
1339 * should always be valid.
1340 * Returns:
1341 * 0 KDB was invoked for an event which it wasn't responsible
1342 * 1 KDB handled the event for which it was invoked.
1343 */
1344int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1345 kdb_dbtrap_t db_result, struct pt_regs *regs)
1346{
1347 int result = 1;
1348 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1349 while (1) {
1350 /*
1351 * All processors except the one that is in control
1352 * will spin here.
1353 */
1354 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1355 while (KDB_STATE(HOLD_CPU)) {
1356 /* state KDB is turned off by kdb_cpu to see if the
1357 * other cpus are still live, each cpu in this loop
1358 * turns it back on.
1359 */
1360 if (!KDB_STATE(KDB))
1361 KDB_STATE_SET(KDB);
1362 }
1363
1364 KDB_STATE_CLEAR(SUPPRESS);
1365 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1366 if (KDB_STATE(LEAVING))
1367 break; /* Another cpu said 'go' */
1368 /* Still using kdb, this processor is in control */
1369 result = kdb_local(reason2, error, regs, db_result);
1370 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1371
1372 if (result == KDB_CMD_CPU)
1373 break;
1374
1375 if (result == KDB_CMD_SS) {
1376 KDB_STATE_SET(DOING_SS);
1377 break;
1378 }
1379
1380 if (result == KDB_CMD_KGDB) {
1381 if (!KDB_STATE(DOING_KGDB))
1382 kdb_printf("Entering please attach debugger "
1383 "or use $D#44+ or $3#33\n");
1384 break;
1385 }
1386 if (result && result != 1 && result != KDB_CMD_GO)
1387 kdb_printf("\nUnexpected kdb_local return code %d\n",
1388 result);
1389 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1390 break;
1391 }
1392 if (KDB_STATE(DOING_SS))
1393 KDB_STATE_CLEAR(SSBPT);
1394
1395 /* Clean up any keyboard devices before leaving */
1396 kdb_kbd_cleanup_state();
1397
1398 return result;
1399}
1400
1401/*
1402 * kdb_mdr - This function implements the guts of the 'mdr', memory
1403 * read command.
1404 * mdr <addr arg>,<byte count>
1405 * Inputs:
1406 * addr Start address
1407 * count Number of bytes
1408 * Returns:
1409 * Always 0. Any errors are detected and printed by kdb_getarea.
1410 */
1411static int kdb_mdr(unsigned long addr, unsigned int count)
1412{
1413 unsigned char c;
1414 while (count--) {
1415 if (kdb_getarea(c, addr))
1416 return 0;
1417 kdb_printf("%02x", c);
1418 addr++;
1419 }
1420 kdb_printf("\n");
1421 return 0;
1422}
1423
1424/*
1425 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1426 * 'md8' 'mdr' and 'mds' commands.
1427 *
1428 * md|mds [<addr arg> [<line count> [<radix>]]]
1429 * mdWcN [<addr arg> [<line count> [<radix>]]]
1430 * where W = is the width (1, 2, 4 or 8) and N is the count.
1431 * for eg., md1c20 reads 20 bytes, 1 at a time.
1432 * mdr <addr arg>,<byte count>
1433 */
1434static void kdb_md_line(const char *fmtstr, unsigned long addr,
1435 int symbolic, int nosect, int bytesperword,
1436 int num, int repeat, int phys)
1437{
1438 /* print just one line of data */
1439 kdb_symtab_t symtab;
1440 char cbuf[32];
1441 char *c = cbuf;
1442 int i;
1443 unsigned long word;
1444
1445 memset(cbuf, '\0', sizeof(cbuf));
1446 if (phys)
1447 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1448 else
1449 kdb_printf(kdb_machreg_fmt0 " ", addr);
1450
1451 for (i = 0; i < num && repeat--; i++) {
1452 if (phys) {
1453 if (kdb_getphysword(&word, addr, bytesperword))
1454 break;
1455 } else if (kdb_getword(&word, addr, bytesperword))
1456 break;
1457 kdb_printf(fmtstr, word);
1458 if (symbolic)
1459 kdbnearsym(word, &symtab);
1460 else
1461 memset(&symtab, 0, sizeof(symtab));
1462 if (symtab.sym_name) {
1463 kdb_symbol_print(word, &symtab, 0);
1464 if (!nosect) {
1465 kdb_printf("\n");
1466 kdb_printf(" %s %s "
1467 kdb_machreg_fmt " "
1468 kdb_machreg_fmt " "
1469 kdb_machreg_fmt, symtab.mod_name,
1470 symtab.sec_name, symtab.sec_start,
1471 symtab.sym_start, symtab.sym_end);
1472 }
1473 addr += bytesperword;
1474 } else {
1475 union {
1476 u64 word;
1477 unsigned char c[8];
1478 } wc;
1479 unsigned char *cp;
1480#ifdef __BIG_ENDIAN
1481 cp = wc.c + 8 - bytesperword;
1482#else
1483 cp = wc.c;
1484#endif
1485 wc.word = word;
1486#define printable_char(c) \
1487 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1488 switch (bytesperword) {
1489 case 8:
1490 *c++ = printable_char(*cp++);
1491 *c++ = printable_char(*cp++);
1492 *c++ = printable_char(*cp++);
1493 *c++ = printable_char(*cp++);
1494 addr += 4;
1495 case 4:
1496 *c++ = printable_char(*cp++);
1497 *c++ = printable_char(*cp++);
1498 addr += 2;
1499 case 2:
1500 *c++ = printable_char(*cp++);
1501 addr++;
1502 case 1:
1503 *c++ = printable_char(*cp++);
1504 addr++;
1505 break;
1506 }
1507#undef printable_char
1508 }
1509 }
1510 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1511 " ", cbuf);
1512}
1513
1514static int kdb_md(int argc, const char **argv)
1515{
1516 static unsigned long last_addr;
1517 static int last_radix, last_bytesperword, last_repeat;
1518 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1519 int nosect = 0;
1520 char fmtchar, fmtstr[64];
1521 unsigned long addr;
1522 unsigned long word;
1523 long offset = 0;
1524 int symbolic = 0;
1525 int valid = 0;
1526 int phys = 0;
1527
1528 kdbgetintenv("MDCOUNT", &mdcount);
1529 kdbgetintenv("RADIX", &radix);
1530 kdbgetintenv("BYTESPERWORD", &bytesperword);
1531
1532 /* Assume 'md <addr>' and start with environment values */
1533 repeat = mdcount * 16 / bytesperword;
1534
1535 if (strcmp(argv[0], "mdr") == 0) {
1536 if (argc != 2)
1537 return KDB_ARGCOUNT;
1538 valid = 1;
1539 } else if (isdigit(argv[0][2])) {
1540 bytesperword = (int)(argv[0][2] - '0');
1541 if (bytesperword == 0) {
1542 bytesperword = last_bytesperword;
1543 if (bytesperword == 0)
1544 bytesperword = 4;
1545 }
1546 last_bytesperword = bytesperword;
1547 repeat = mdcount * 16 / bytesperword;
1548 if (!argv[0][3])
1549 valid = 1;
1550 else if (argv[0][3] == 'c' && argv[0][4]) {
1551 char *p;
1552 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1553 mdcount = ((repeat * bytesperword) + 15) / 16;
1554 valid = !*p;
1555 }
1556 last_repeat = repeat;
1557 } else if (strcmp(argv[0], "md") == 0)
1558 valid = 1;
1559 else if (strcmp(argv[0], "mds") == 0)
1560 valid = 1;
1561 else if (strcmp(argv[0], "mdp") == 0) {
1562 phys = valid = 1;
1563 }
1564 if (!valid)
1565 return KDB_NOTFOUND;
1566
1567 if (argc == 0) {
1568 if (last_addr == 0)
1569 return KDB_ARGCOUNT;
1570 addr = last_addr;
1571 radix = last_radix;
1572 bytesperword = last_bytesperword;
1573 repeat = last_repeat;
1574 mdcount = ((repeat * bytesperword) + 15) / 16;
1575 }
1576
1577 if (argc) {
1578 unsigned long val;
1579 int diag, nextarg = 1;
1580 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1581 &offset, NULL);
1582 if (diag)
1583 return diag;
1584 if (argc > nextarg+2)
1585 return KDB_ARGCOUNT;
1586
1587 if (argc >= nextarg) {
1588 diag = kdbgetularg(argv[nextarg], &val);
1589 if (!diag) {
1590 mdcount = (int) val;
1591 repeat = mdcount * 16 / bytesperword;
1592 }
1593 }
1594 if (argc >= nextarg+1) {
1595 diag = kdbgetularg(argv[nextarg+1], &val);
1596 if (!diag)
1597 radix = (int) val;
1598 }
1599 }
1600
1601 if (strcmp(argv[0], "mdr") == 0)
1602 return kdb_mdr(addr, mdcount);
1603
1604 switch (radix) {
1605 case 10:
1606 fmtchar = 'd';
1607 break;
1608 case 16:
1609 fmtchar = 'x';
1610 break;
1611 case 8:
1612 fmtchar = 'o';
1613 break;
1614 default:
1615 return KDB_BADRADIX;
1616 }
1617
1618 last_radix = radix;
1619
1620 if (bytesperword > KDB_WORD_SIZE)
1621 return KDB_BADWIDTH;
1622
1623 switch (bytesperword) {
1624 case 8:
1625 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1626 break;
1627 case 4:
1628 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1629 break;
1630 case 2:
1631 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1632 break;
1633 case 1:
1634 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1635 break;
1636 default:
1637 return KDB_BADWIDTH;
1638 }
1639
1640 last_repeat = repeat;
1641 last_bytesperword = bytesperword;
1642
1643 if (strcmp(argv[0], "mds") == 0) {
1644 symbolic = 1;
1645 /* Do not save these changes as last_*, they are temporary mds
1646 * overrides.
1647 */
1648 bytesperword = KDB_WORD_SIZE;
1649 repeat = mdcount;
1650 kdbgetintenv("NOSECT", &nosect);
1651 }
1652
1653 /* Round address down modulo BYTESPERWORD */
1654
1655 addr &= ~(bytesperword-1);
1656
1657 while (repeat > 0) {
1658 unsigned long a;
1659 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1660
1661 if (KDB_FLAG(CMD_INTERRUPT))
1662 return 0;
1663 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1664 if (phys) {
1665 if (kdb_getphysword(&word, a, bytesperword)
1666 || word)
1667 break;
1668 } else if (kdb_getword(&word, a, bytesperword) || word)
1669 break;
1670 }
1671 n = min(num, repeat);
1672 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1673 num, repeat, phys);
1674 addr += bytesperword * n;
1675 repeat -= n;
1676 z = (z + num - 1) / num;
1677 if (z > 2) {
1678 int s = num * (z-2);
1679 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1680 " zero suppressed\n",
1681 addr, addr + bytesperword * s - 1);
1682 addr += bytesperword * s;
1683 repeat -= s;
1684 }
1685 }
1686 last_addr = addr;
1687
1688 return 0;
1689}
1690
1691/*
1692 * kdb_mm - This function implements the 'mm' command.
1693 * mm address-expression new-value
1694 * Remarks:
1695 * mm works on machine words, mmW works on bytes.
1696 */
1697static int kdb_mm(int argc, const char **argv)
1698{
1699 int diag;
1700 unsigned long addr;
1701 long offset = 0;
1702 unsigned long contents;
1703 int nextarg;
1704 int width;
1705
1706 if (argv[0][2] && !isdigit(argv[0][2]))
1707 return KDB_NOTFOUND;
1708
1709 if (argc < 2)
1710 return KDB_ARGCOUNT;
1711
1712 nextarg = 1;
1713 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1714 if (diag)
1715 return diag;
1716
1717 if (nextarg > argc)
1718 return KDB_ARGCOUNT;
1719 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1720 if (diag)
1721 return diag;
1722
1723 if (nextarg != argc + 1)
1724 return KDB_ARGCOUNT;
1725
1726 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1727 diag = kdb_putword(addr, contents, width);
1728 if (diag)
1729 return diag;
1730
1731 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1732
1733 return 0;
1734}
1735
1736/*
1737 * kdb_go - This function implements the 'go' command.
1738 * go [address-expression]
1739 */
1740static int kdb_go(int argc, const char **argv)
1741{
1742 unsigned long addr;
1743 int diag;
1744 int nextarg;
1745 long offset;
1746
1747 if (raw_smp_processor_id() != kdb_initial_cpu) {
1748 kdb_printf("go must execute on the entry cpu, "
1749 "please use \"cpu %d\" and then execute go\n",
1750 kdb_initial_cpu);
1751 return KDB_BADCPUNUM;
1752 }
1753 if (argc == 1) {
1754 nextarg = 1;
1755 diag = kdbgetaddrarg(argc, argv, &nextarg,
1756 &addr, &offset, NULL);
1757 if (diag)
1758 return diag;
1759 } else if (argc) {
1760 return KDB_ARGCOUNT;
1761 }
1762
1763 diag = KDB_CMD_GO;
1764 if (KDB_FLAG(CATASTROPHIC)) {
1765 kdb_printf("Catastrophic error detected\n");
1766 kdb_printf("kdb_continue_catastrophic=%d, ",
1767 kdb_continue_catastrophic);
1768 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1769 kdb_printf("type go a second time if you really want "
1770 "to continue\n");
1771 return 0;
1772 }
1773 if (kdb_continue_catastrophic == 2) {
1774 kdb_printf("forcing reboot\n");
1775 kdb_reboot(0, NULL);
1776 }
1777 kdb_printf("attempting to continue\n");
1778 }
1779 return diag;
1780}
1781
1782/*
1783 * kdb_rd - This function implements the 'rd' command.
1784 */
1785static int kdb_rd(int argc, const char **argv)
1786{
1787 int len = kdb_check_regs();
1788#if DBG_MAX_REG_NUM > 0
1789 int i;
1790 char *rname;
1791 int rsize;
1792 u64 reg64;
1793 u32 reg32;
1794 u16 reg16;
1795 u8 reg8;
1796
1797 if (len)
1798 return len;
1799
1800 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1801 rsize = dbg_reg_def[i].size * 2;
1802 if (rsize > 16)
1803 rsize = 2;
1804 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1805 len = 0;
1806 kdb_printf("\n");
1807 }
1808 if (len)
1809 len += kdb_printf(" ");
1810 switch(dbg_reg_def[i].size * 8) {
1811 case 8:
1812 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1813 if (!rname)
1814 break;
1815 len += kdb_printf("%s: %02x", rname, reg8);
1816 break;
1817 case 16:
1818 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1819 if (!rname)
1820 break;
1821 len += kdb_printf("%s: %04x", rname, reg16);
1822 break;
1823 case 32:
1824 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1825 if (!rname)
1826 break;
1827 len += kdb_printf("%s: %08x", rname, reg32);
1828 break;
1829 case 64:
1830 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1831 if (!rname)
1832 break;
1833 len += kdb_printf("%s: %016llx", rname, reg64);
1834 break;
1835 default:
1836 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1837 }
1838 }
1839 kdb_printf("\n");
1840#else
1841 if (len)
1842 return len;
1843
1844 kdb_dumpregs(kdb_current_regs);
1845#endif
1846 return 0;
1847}
1848
1849/*
1850 * kdb_rm - This function implements the 'rm' (register modify) command.
1851 * rm register-name new-contents
1852 * Remarks:
1853 * Allows register modification with the same restrictions as gdb
1854 */
1855static int kdb_rm(int argc, const char **argv)
1856{
1857#if DBG_MAX_REG_NUM > 0
1858 int diag;
1859 const char *rname;
1860 int i;
1861 u64 reg64;
1862 u32 reg32;
1863 u16 reg16;
1864 u8 reg8;
1865
1866 if (argc != 2)
1867 return KDB_ARGCOUNT;
1868 /*
1869 * Allow presence or absence of leading '%' symbol.
1870 */
1871 rname = argv[1];
1872 if (*rname == '%')
1873 rname++;
1874
1875 diag = kdbgetu64arg(argv[2], ®64);
1876 if (diag)
1877 return diag;
1878
1879 diag = kdb_check_regs();
1880 if (diag)
1881 return diag;
1882
1883 diag = KDB_BADREG;
1884 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1885 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1886 diag = 0;
1887 break;
1888 }
1889 }
1890 if (!diag) {
1891 switch(dbg_reg_def[i].size * 8) {
1892 case 8:
1893 reg8 = reg64;
1894 dbg_set_reg(i, ®8, kdb_current_regs);
1895 break;
1896 case 16:
1897 reg16 = reg64;
1898 dbg_set_reg(i, ®16, kdb_current_regs);
1899 break;
1900 case 32:
1901 reg32 = reg64;
1902 dbg_set_reg(i, ®32, kdb_current_regs);
1903 break;
1904 case 64:
1905 dbg_set_reg(i, ®64, kdb_current_regs);
1906 break;
1907 }
1908 }
1909 return diag;
1910#else
1911 kdb_printf("ERROR: Register set currently not implemented\n");
1912 return 0;
1913#endif
1914}
1915
1916#if defined(CONFIG_MAGIC_SYSRQ)
1917/*
1918 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1919 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1920 * sr <magic-sysrq-code>
1921 */
1922static int kdb_sr(int argc, const char **argv)
1923{
1924 if (argc != 1)
1925 return KDB_ARGCOUNT;
1926 kdb_trap_printk++;
1927 __handle_sysrq(*argv[1], false);
1928 kdb_trap_printk--;
1929
1930 return 0;
1931}
1932#endif /* CONFIG_MAGIC_SYSRQ */
1933
1934/*
1935 * kdb_ef - This function implements the 'regs' (display exception
1936 * frame) command. This command takes an address and expects to
1937 * find an exception frame at that address, formats and prints
1938 * it.
1939 * regs address-expression
1940 * Remarks:
1941 * Not done yet.
1942 */
1943static int kdb_ef(int argc, const char **argv)
1944{
1945 int diag;
1946 unsigned long addr;
1947 long offset;
1948 int nextarg;
1949
1950 if (argc != 1)
1951 return KDB_ARGCOUNT;
1952
1953 nextarg = 1;
1954 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1955 if (diag)
1956 return diag;
1957 show_regs((struct pt_regs *)addr);
1958 return 0;
1959}
1960
1961#if defined(CONFIG_MODULES)
1962/*
1963 * kdb_lsmod - This function implements the 'lsmod' command. Lists
1964 * currently loaded kernel modules.
1965 * Mostly taken from userland lsmod.
1966 */
1967static int kdb_lsmod(int argc, const char **argv)
1968{
1969 struct module *mod;
1970
1971 if (argc != 0)
1972 return KDB_ARGCOUNT;
1973
1974 kdb_printf("Module Size modstruct Used by\n");
1975 list_for_each_entry(mod, kdb_modules, list) {
1976 if (mod->state == MODULE_STATE_UNFORMED)
1977 continue;
1978
1979 kdb_printf("%-20s%8u 0x%p ", mod->name,
1980 mod->core_size, (void *)mod);
1981#ifdef CONFIG_MODULE_UNLOAD
1982 kdb_printf("%4ld ", module_refcount(mod));
1983#endif
1984 if (mod->state == MODULE_STATE_GOING)
1985 kdb_printf(" (Unloading)");
1986 else if (mod->state == MODULE_STATE_COMING)
1987 kdb_printf(" (Loading)");
1988 else
1989 kdb_printf(" (Live)");
1990 kdb_printf(" 0x%p", mod->module_core);
1991
1992#ifdef CONFIG_MODULE_UNLOAD
1993 {
1994 struct module_use *use;
1995 kdb_printf(" [ ");
1996 list_for_each_entry(use, &mod->source_list,
1997 source_list)
1998 kdb_printf("%s ", use->target->name);
1999 kdb_printf("]\n");
2000 }
2001#endif
2002 }
2003
2004 return 0;
2005}
2006
2007#endif /* CONFIG_MODULES */
2008
2009/*
2010 * kdb_env - This function implements the 'env' command. Display the
2011 * current environment variables.
2012 */
2013
2014static int kdb_env(int argc, const char **argv)
2015{
2016 int i;
2017
2018 for (i = 0; i < __nenv; i++) {
2019 if (__env[i])
2020 kdb_printf("%s\n", __env[i]);
2021 }
2022
2023 if (KDB_DEBUG(MASK))
2024 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2025
2026 return 0;
2027}
2028
2029#ifdef CONFIG_PRINTK
2030/*
2031 * kdb_dmesg - This function implements the 'dmesg' command to display
2032 * the contents of the syslog buffer.
2033 * dmesg [lines] [adjust]
2034 */
2035static int kdb_dmesg(int argc, const char **argv)
2036{
2037 int diag;
2038 int logging;
2039 int lines = 0;
2040 int adjust = 0;
2041 int n = 0;
2042 int skip = 0;
2043 struct kmsg_dumper dumper = { .active = 1 };
2044 size_t len;
2045 char buf[201];
2046
2047 if (argc > 2)
2048 return KDB_ARGCOUNT;
2049 if (argc) {
2050 char *cp;
2051 lines = simple_strtol(argv[1], &cp, 0);
2052 if (*cp)
2053 lines = 0;
2054 if (argc > 1) {
2055 adjust = simple_strtoul(argv[2], &cp, 0);
2056 if (*cp || adjust < 0)
2057 adjust = 0;
2058 }
2059 }
2060
2061 /* disable LOGGING if set */
2062 diag = kdbgetintenv("LOGGING", &logging);
2063 if (!diag && logging) {
2064 const char *setargs[] = { "set", "LOGGING", "0" };
2065 kdb_set(2, setargs);
2066 }
2067
2068 kmsg_dump_rewind_nolock(&dumper);
2069 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2070 n++;
2071
2072 if (lines < 0) {
2073 if (adjust >= n)
2074 kdb_printf("buffer only contains %d lines, nothing "
2075 "printed\n", n);
2076 else if (adjust - lines >= n)
2077 kdb_printf("buffer only contains %d lines, last %d "
2078 "lines printed\n", n, n - adjust);
2079 skip = adjust;
2080 lines = abs(lines);
2081 } else if (lines > 0) {
2082 skip = n - lines - adjust;
2083 lines = abs(lines);
2084 if (adjust >= n) {
2085 kdb_printf("buffer only contains %d lines, "
2086 "nothing printed\n", n);
2087 skip = n;
2088 } else if (skip < 0) {
2089 lines += skip;
2090 skip = 0;
2091 kdb_printf("buffer only contains %d lines, first "
2092 "%d lines printed\n", n, lines);
2093 }
2094 } else {
2095 lines = n;
2096 }
2097
2098 if (skip >= n || skip < 0)
2099 return 0;
2100
2101 kmsg_dump_rewind_nolock(&dumper);
2102 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2103 if (skip) {
2104 skip--;
2105 continue;
2106 }
2107 if (!lines--)
2108 break;
2109 if (KDB_FLAG(CMD_INTERRUPT))
2110 return 0;
2111
2112 kdb_printf("%.*s\n", (int)len - 1, buf);
2113 }
2114
2115 return 0;
2116}
2117#endif /* CONFIG_PRINTK */
2118
2119/* Make sure we balance enable/disable calls, must disable first. */
2120static atomic_t kdb_nmi_disabled;
2121
2122static int kdb_disable_nmi(int argc, const char *argv[])
2123{
2124 if (atomic_read(&kdb_nmi_disabled))
2125 return 0;
2126 atomic_set(&kdb_nmi_disabled, 1);
2127 arch_kgdb_ops.enable_nmi(0);
2128 return 0;
2129}
2130
2131static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2132{
2133 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2134 return -EINVAL;
2135 arch_kgdb_ops.enable_nmi(1);
2136 return 0;
2137}
2138
2139static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2140 .set = kdb_param_enable_nmi,
2141};
2142module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2143
2144/*
2145 * kdb_cpu - This function implements the 'cpu' command.
2146 * cpu [<cpunum>]
2147 * Returns:
2148 * KDB_CMD_CPU for success, a kdb diagnostic if error
2149 */
2150static void kdb_cpu_status(void)
2151{
2152 int i, start_cpu, first_print = 1;
2153 char state, prev_state = '?';
2154
2155 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2156 kdb_printf("Available cpus: ");
2157 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2158 if (!cpu_online(i)) {
2159 state = 'F'; /* cpu is offline */
2160 } else {
2161 state = ' '; /* cpu is responding to kdb */
2162 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2163 state = 'I'; /* idle task */
2164 }
2165 if (state != prev_state) {
2166 if (prev_state != '?') {
2167 if (!first_print)
2168 kdb_printf(", ");
2169 first_print = 0;
2170 kdb_printf("%d", start_cpu);
2171 if (start_cpu < i-1)
2172 kdb_printf("-%d", i-1);
2173 if (prev_state != ' ')
2174 kdb_printf("(%c)", prev_state);
2175 }
2176 prev_state = state;
2177 start_cpu = i;
2178 }
2179 }
2180 /* print the trailing cpus, ignoring them if they are all offline */
2181 if (prev_state != 'F') {
2182 if (!first_print)
2183 kdb_printf(", ");
2184 kdb_printf("%d", start_cpu);
2185 if (start_cpu < i-1)
2186 kdb_printf("-%d", i-1);
2187 if (prev_state != ' ')
2188 kdb_printf("(%c)", prev_state);
2189 }
2190 kdb_printf("\n");
2191}
2192
2193static int kdb_cpu(int argc, const char **argv)
2194{
2195 unsigned long cpunum;
2196 int diag;
2197
2198 if (argc == 0) {
2199 kdb_cpu_status();
2200 return 0;
2201 }
2202
2203 if (argc != 1)
2204 return KDB_ARGCOUNT;
2205
2206 diag = kdbgetularg(argv[1], &cpunum);
2207 if (diag)
2208 return diag;
2209
2210 /*
2211 * Validate cpunum
2212 */
2213 if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
2214 return KDB_BADCPUNUM;
2215
2216 dbg_switch_cpu = cpunum;
2217
2218 /*
2219 * Switch to other cpu
2220 */
2221 return KDB_CMD_CPU;
2222}
2223
2224/* The user may not realize that ps/bta with no parameters does not print idle
2225 * or sleeping system daemon processes, so tell them how many were suppressed.
2226 */
2227void kdb_ps_suppressed(void)
2228{
2229 int idle = 0, daemon = 0;
2230 unsigned long mask_I = kdb_task_state_string("I"),
2231 mask_M = kdb_task_state_string("M");
2232 unsigned long cpu;
2233 const struct task_struct *p, *g;
2234 for_each_online_cpu(cpu) {
2235 p = kdb_curr_task(cpu);
2236 if (kdb_task_state(p, mask_I))
2237 ++idle;
2238 }
2239 kdb_do_each_thread(g, p) {
2240 if (kdb_task_state(p, mask_M))
2241 ++daemon;
2242 } kdb_while_each_thread(g, p);
2243 if (idle || daemon) {
2244 if (idle)
2245 kdb_printf("%d idle process%s (state I)%s\n",
2246 idle, idle == 1 ? "" : "es",
2247 daemon ? " and " : "");
2248 if (daemon)
2249 kdb_printf("%d sleeping system daemon (state M) "
2250 "process%s", daemon,
2251 daemon == 1 ? "" : "es");
2252 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2253 }
2254}
2255
2256/*
2257 * kdb_ps - This function implements the 'ps' command which shows a
2258 * list of the active processes.
2259 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2260 */
2261void kdb_ps1(const struct task_struct *p)
2262{
2263 int cpu;
2264 unsigned long tmp;
2265
2266 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2267 return;
2268
2269 cpu = kdb_process_cpu(p);
2270 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2271 (void *)p, p->pid, p->parent->pid,
2272 kdb_task_has_cpu(p), kdb_process_cpu(p),
2273 kdb_task_state_char(p),
2274 (void *)(&p->thread),
2275 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2276 p->comm);
2277 if (kdb_task_has_cpu(p)) {
2278 if (!KDB_TSK(cpu)) {
2279 kdb_printf(" Error: no saved data for this cpu\n");
2280 } else {
2281 if (KDB_TSK(cpu) != p)
2282 kdb_printf(" Error: does not match running "
2283 "process table (0x%p)\n", KDB_TSK(cpu));
2284 }
2285 }
2286}
2287
2288static int kdb_ps(int argc, const char **argv)
2289{
2290 struct task_struct *g, *p;
2291 unsigned long mask, cpu;
2292
2293 if (argc == 0)
2294 kdb_ps_suppressed();
2295 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2296 (int)(2*sizeof(void *))+2, "Task Addr",
2297 (int)(2*sizeof(void *))+2, "Thread");
2298 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2299 /* Run the active tasks first */
2300 for_each_online_cpu(cpu) {
2301 if (KDB_FLAG(CMD_INTERRUPT))
2302 return 0;
2303 p = kdb_curr_task(cpu);
2304 if (kdb_task_state(p, mask))
2305 kdb_ps1(p);
2306 }
2307 kdb_printf("\n");
2308 /* Now the real tasks */
2309 kdb_do_each_thread(g, p) {
2310 if (KDB_FLAG(CMD_INTERRUPT))
2311 return 0;
2312 if (kdb_task_state(p, mask))
2313 kdb_ps1(p);
2314 } kdb_while_each_thread(g, p);
2315
2316 return 0;
2317}
2318
2319/*
2320 * kdb_pid - This function implements the 'pid' command which switches
2321 * the currently active process.
2322 * pid [<pid> | R]
2323 */
2324static int kdb_pid(int argc, const char **argv)
2325{
2326 struct task_struct *p;
2327 unsigned long val;
2328 int diag;
2329
2330 if (argc > 1)
2331 return KDB_ARGCOUNT;
2332
2333 if (argc) {
2334 if (strcmp(argv[1], "R") == 0) {
2335 p = KDB_TSK(kdb_initial_cpu);
2336 } else {
2337 diag = kdbgetularg(argv[1], &val);
2338 if (diag)
2339 return KDB_BADINT;
2340
2341 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2342 if (!p) {
2343 kdb_printf("No task with pid=%d\n", (pid_t)val);
2344 return 0;
2345 }
2346 }
2347 kdb_set_current_task(p);
2348 }
2349 kdb_printf("KDB current process is %s(pid=%d)\n",
2350 kdb_current_task->comm,
2351 kdb_current_task->pid);
2352
2353 return 0;
2354}
2355
2356static int kdb_kgdb(int argc, const char **argv)
2357{
2358 return KDB_CMD_KGDB;
2359}
2360
2361/*
2362 * kdb_help - This function implements the 'help' and '?' commands.
2363 */
2364static int kdb_help(int argc, const char **argv)
2365{
2366 kdbtab_t *kt;
2367 int i;
2368
2369 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2370 kdb_printf("-----------------------------"
2371 "-----------------------------\n");
2372 for_each_kdbcmd(kt, i) {
2373 char *space = "";
2374 if (KDB_FLAG(CMD_INTERRUPT))
2375 return 0;
2376 if (!kt->cmd_name)
2377 continue;
2378 if (strlen(kt->cmd_usage) > 20)
2379 space = "\n ";
2380 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2381 kt->cmd_usage, space, kt->cmd_help);
2382 }
2383 return 0;
2384}
2385
2386/*
2387 * kdb_kill - This function implements the 'kill' commands.
2388 */
2389static int kdb_kill(int argc, const char **argv)
2390{
2391 long sig, pid;
2392 char *endp;
2393 struct task_struct *p;
2394 struct siginfo info;
2395
2396 if (argc != 2)
2397 return KDB_ARGCOUNT;
2398
2399 sig = simple_strtol(argv[1], &endp, 0);
2400 if (*endp)
2401 return KDB_BADINT;
2402 if (sig >= 0) {
2403 kdb_printf("Invalid signal parameter.<-signal>\n");
2404 return 0;
2405 }
2406 sig = -sig;
2407
2408 pid = simple_strtol(argv[2], &endp, 0);
2409 if (*endp)
2410 return KDB_BADINT;
2411 if (pid <= 0) {
2412 kdb_printf("Process ID must be large than 0.\n");
2413 return 0;
2414 }
2415
2416 /* Find the process. */
2417 p = find_task_by_pid_ns(pid, &init_pid_ns);
2418 if (!p) {
2419 kdb_printf("The specified process isn't found.\n");
2420 return 0;
2421 }
2422 p = p->group_leader;
2423 info.si_signo = sig;
2424 info.si_errno = 0;
2425 info.si_code = SI_USER;
2426 info.si_pid = pid; /* same capabilities as process being signalled */
2427 info.si_uid = 0; /* kdb has root authority */
2428 kdb_send_sig_info(p, &info);
2429 return 0;
2430}
2431
2432struct kdb_tm {
2433 int tm_sec; /* seconds */
2434 int tm_min; /* minutes */
2435 int tm_hour; /* hours */
2436 int tm_mday; /* day of the month */
2437 int tm_mon; /* month */
2438 int tm_year; /* year */
2439};
2440
2441static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2442{
2443 /* This will work from 1970-2099, 2100 is not a leap year */
2444 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2445 31, 30, 31, 30, 31 };
2446 memset(tm, 0, sizeof(*tm));
2447 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2448 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2449 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2450 tm->tm_min = tm->tm_sec / 60 % 60;
2451 tm->tm_hour = tm->tm_sec / 60 / 60;
2452 tm->tm_sec = tm->tm_sec % 60;
2453 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2454 tm->tm_mday %= (4*365+1);
2455 mon_day[1] = 29;
2456 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2457 tm->tm_mday -= mon_day[tm->tm_mon];
2458 if (++tm->tm_mon == 12) {
2459 tm->tm_mon = 0;
2460 ++tm->tm_year;
2461 mon_day[1] = 28;
2462 }
2463 }
2464 ++tm->tm_mday;
2465}
2466
2467/*
2468 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2469 * I cannot call that code directly from kdb, it has an unconditional
2470 * cli()/sti() and calls routines that take locks which can stop the debugger.
2471 */
2472static void kdb_sysinfo(struct sysinfo *val)
2473{
2474 struct timespec uptime;
2475 do_posix_clock_monotonic_gettime(&uptime);
2476 memset(val, 0, sizeof(*val));
2477 val->uptime = uptime.tv_sec;
2478 val->loads[0] = avenrun[0];
2479 val->loads[1] = avenrun[1];
2480 val->loads[2] = avenrun[2];
2481 val->procs = nr_threads-1;
2482 si_meminfo(val);
2483
2484 return;
2485}
2486
2487/*
2488 * kdb_summary - This function implements the 'summary' command.
2489 */
2490static int kdb_summary(int argc, const char **argv)
2491{
2492 struct timespec now;
2493 struct kdb_tm tm;
2494 struct sysinfo val;
2495
2496 if (argc)
2497 return KDB_ARGCOUNT;
2498
2499 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2500 kdb_printf("release %s\n", init_uts_ns.name.release);
2501 kdb_printf("version %s\n", init_uts_ns.name.version);
2502 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2503 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2504 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2505 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2506
2507 now = __current_kernel_time();
2508 kdb_gmtime(&now, &tm);
2509 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2510 "tz_minuteswest %d\n",
2511 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2512 tm.tm_hour, tm.tm_min, tm.tm_sec,
2513 sys_tz.tz_minuteswest);
2514
2515 kdb_sysinfo(&val);
2516 kdb_printf("uptime ");
2517 if (val.uptime > (24*60*60)) {
2518 int days = val.uptime / (24*60*60);
2519 val.uptime %= (24*60*60);
2520 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2521 }
2522 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2523
2524 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2525
2526#define LOAD_INT(x) ((x) >> FSHIFT)
2527#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2528 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2529 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2530 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2531 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2532#undef LOAD_INT
2533#undef LOAD_FRAC
2534 /* Display in kilobytes */
2535#define K(x) ((x) << (PAGE_SHIFT - 10))
2536 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2537 "Buffers: %8lu kB\n",
2538 val.totalram, val.freeram, val.bufferram);
2539 return 0;
2540}
2541
2542/*
2543 * kdb_per_cpu - This function implements the 'per_cpu' command.
2544 */
2545static int kdb_per_cpu(int argc, const char **argv)
2546{
2547 char fmtstr[64];
2548 int cpu, diag, nextarg = 1;
2549 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2550
2551 if (argc < 1 || argc > 3)
2552 return KDB_ARGCOUNT;
2553
2554 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2555 if (diag)
2556 return diag;
2557
2558 if (argc >= 2) {
2559 diag = kdbgetularg(argv[2], &bytesperword);
2560 if (diag)
2561 return diag;
2562 }
2563 if (!bytesperword)
2564 bytesperword = KDB_WORD_SIZE;
2565 else if (bytesperword > KDB_WORD_SIZE)
2566 return KDB_BADWIDTH;
2567 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2568 if (argc >= 3) {
2569 diag = kdbgetularg(argv[3], &whichcpu);
2570 if (diag)
2571 return diag;
2572 if (!cpu_online(whichcpu)) {
2573 kdb_printf("cpu %ld is not online\n", whichcpu);
2574 return KDB_BADCPUNUM;
2575 }
2576 }
2577
2578 /* Most architectures use __per_cpu_offset[cpu], some use
2579 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2580 */
2581#ifdef __per_cpu_offset
2582#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2583#else
2584#ifdef CONFIG_SMP
2585#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2586#else
2587#define KDB_PCU(cpu) 0
2588#endif
2589#endif
2590 for_each_online_cpu(cpu) {
2591 if (KDB_FLAG(CMD_INTERRUPT))
2592 return 0;
2593
2594 if (whichcpu != ~0UL && whichcpu != cpu)
2595 continue;
2596 addr = symaddr + KDB_PCU(cpu);
2597 diag = kdb_getword(&val, addr, bytesperword);
2598 if (diag) {
2599 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2600 "read, diag=%d\n", cpu, addr, diag);
2601 continue;
2602 }
2603 kdb_printf("%5d ", cpu);
2604 kdb_md_line(fmtstr, addr,
2605 bytesperword == KDB_WORD_SIZE,
2606 1, bytesperword, 1, 1, 0);
2607 }
2608#undef KDB_PCU
2609 return 0;
2610}
2611
2612/*
2613 * display help for the use of cmd | grep pattern
2614 */
2615static int kdb_grep_help(int argc, const char **argv)
2616{
2617 kdb_printf("Usage of cmd args | grep pattern:\n");
2618 kdb_printf(" Any command's output may be filtered through an ");
2619 kdb_printf("emulated 'pipe'.\n");
2620 kdb_printf(" 'grep' is just a key word.\n");
2621 kdb_printf(" The pattern may include a very limited set of "
2622 "metacharacters:\n");
2623 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2624 kdb_printf(" And if there are spaces in the pattern, you may "
2625 "quote it:\n");
2626 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2627 " or \"^pat tern$\"\n");
2628 return 0;
2629}
2630
2631/*
2632 * kdb_register_repeat - This function is used to register a kernel
2633 * debugger command.
2634 * Inputs:
2635 * cmd Command name
2636 * func Function to execute the command
2637 * usage A simple usage string showing arguments
2638 * help A simple help string describing command
2639 * repeat Does the command auto repeat on enter?
2640 * Returns:
2641 * zero for success, one if a duplicate command.
2642 */
2643#define kdb_command_extend 50 /* arbitrary */
2644int kdb_register_repeat(char *cmd,
2645 kdb_func_t func,
2646 char *usage,
2647 char *help,
2648 short minlen,
2649 kdb_repeat_t repeat)
2650{
2651 int i;
2652 kdbtab_t *kp;
2653
2654 /*
2655 * Brute force method to determine duplicates
2656 */
2657 for_each_kdbcmd(kp, i) {
2658 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2659 kdb_printf("Duplicate kdb command registered: "
2660 "%s, func %p help %s\n", cmd, func, help);
2661 return 1;
2662 }
2663 }
2664
2665 /*
2666 * Insert command into first available location in table
2667 */
2668 for_each_kdbcmd(kp, i) {
2669 if (kp->cmd_name == NULL)
2670 break;
2671 }
2672
2673 if (i >= kdb_max_commands) {
2674 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2675 kdb_command_extend) * sizeof(*new), GFP_KDB);
2676 if (!new) {
2677 kdb_printf("Could not allocate new kdb_command "
2678 "table\n");
2679 return 1;
2680 }
2681 if (kdb_commands) {
2682 memcpy(new, kdb_commands,
2683 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2684 kfree(kdb_commands);
2685 }
2686 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2687 kdb_command_extend * sizeof(*new));
2688 kdb_commands = new;
2689 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2690 kdb_max_commands += kdb_command_extend;
2691 }
2692
2693 kp->cmd_name = cmd;
2694 kp->cmd_func = func;
2695 kp->cmd_usage = usage;
2696 kp->cmd_help = help;
2697 kp->cmd_flags = 0;
2698 kp->cmd_minlen = minlen;
2699 kp->cmd_repeat = repeat;
2700
2701 return 0;
2702}
2703EXPORT_SYMBOL_GPL(kdb_register_repeat);
2704
2705
2706/*
2707 * kdb_register - Compatibility register function for commands that do
2708 * not need to specify a repeat state. Equivalent to
2709 * kdb_register_repeat with KDB_REPEAT_NONE.
2710 * Inputs:
2711 * cmd Command name
2712 * func Function to execute the command
2713 * usage A simple usage string showing arguments
2714 * help A simple help string describing command
2715 * Returns:
2716 * zero for success, one if a duplicate command.
2717 */
2718int kdb_register(char *cmd,
2719 kdb_func_t func,
2720 char *usage,
2721 char *help,
2722 short minlen)
2723{
2724 return kdb_register_repeat(cmd, func, usage, help, minlen,
2725 KDB_REPEAT_NONE);
2726}
2727EXPORT_SYMBOL_GPL(kdb_register);
2728
2729/*
2730 * kdb_unregister - This function is used to unregister a kernel
2731 * debugger command. It is generally called when a module which
2732 * implements kdb commands is unloaded.
2733 * Inputs:
2734 * cmd Command name
2735 * Returns:
2736 * zero for success, one command not registered.
2737 */
2738int kdb_unregister(char *cmd)
2739{
2740 int i;
2741 kdbtab_t *kp;
2742
2743 /*
2744 * find the command.
2745 */
2746 for_each_kdbcmd(kp, i) {
2747 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2748 kp->cmd_name = NULL;
2749 return 0;
2750 }
2751 }
2752
2753 /* Couldn't find it. */
2754 return 1;
2755}
2756EXPORT_SYMBOL_GPL(kdb_unregister);
2757
2758/* Initialize the kdb command table. */
2759static void __init kdb_inittab(void)
2760{
2761 int i;
2762 kdbtab_t *kp;
2763
2764 for_each_kdbcmd(kp, i)
2765 kp->cmd_name = NULL;
2766
2767 kdb_register_repeat("md", kdb_md, "<vaddr>",
2768 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2769 KDB_REPEAT_NO_ARGS);
2770 kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
2771 "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
2772 kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
2773 "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
2774 kdb_register_repeat("mds", kdb_md, "<vaddr>",
2775 "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
2776 kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
2777 "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
2778 kdb_register_repeat("go", kdb_go, "[<vaddr>]",
2779 "Continue Execution", 1, KDB_REPEAT_NONE);
2780 kdb_register_repeat("rd", kdb_rd, "",
2781 "Display Registers", 0, KDB_REPEAT_NONE);
2782 kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
2783 "Modify Registers", 0, KDB_REPEAT_NONE);
2784 kdb_register_repeat("ef", kdb_ef, "<vaddr>",
2785 "Display exception frame", 0, KDB_REPEAT_NONE);
2786 kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
2787 "Stack traceback", 1, KDB_REPEAT_NONE);
2788 kdb_register_repeat("btp", kdb_bt, "<pid>",
2789 "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
2790 kdb_register_repeat("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2791 "Backtrace all processes matching state flag", 0, KDB_REPEAT_NONE);
2792 kdb_register_repeat("btc", kdb_bt, "",
2793 "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
2794 kdb_register_repeat("btt", kdb_bt, "<vaddr>",
2795 "Backtrace process given its struct task address", 0,
2796 KDB_REPEAT_NONE);
2797 kdb_register_repeat("env", kdb_env, "",
2798 "Show environment variables", 0, KDB_REPEAT_NONE);
2799 kdb_register_repeat("set", kdb_set, "",
2800 "Set environment variables", 0, KDB_REPEAT_NONE);
2801 kdb_register_repeat("help", kdb_help, "",
2802 "Display Help Message", 1, KDB_REPEAT_NONE);
2803 kdb_register_repeat("?", kdb_help, "",
2804 "Display Help Message", 0, KDB_REPEAT_NONE);
2805 kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
2806 "Switch to new cpu", 0, KDB_REPEAT_NONE);
2807 kdb_register_repeat("kgdb", kdb_kgdb, "",
2808 "Enter kgdb mode", 0, KDB_REPEAT_NONE);
2809 kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
2810 "Display active task list", 0, KDB_REPEAT_NONE);
2811 kdb_register_repeat("pid", kdb_pid, "<pidnum>",
2812 "Switch to another task", 0, KDB_REPEAT_NONE);
2813 kdb_register_repeat("reboot", kdb_reboot, "",
2814 "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
2815#if defined(CONFIG_MODULES)
2816 kdb_register_repeat("lsmod", kdb_lsmod, "",
2817 "List loaded kernel modules", 0, KDB_REPEAT_NONE);
2818#endif
2819#if defined(CONFIG_MAGIC_SYSRQ)
2820 kdb_register_repeat("sr", kdb_sr, "<key>",
2821 "Magic SysRq key", 0, KDB_REPEAT_NONE);
2822#endif
2823#if defined(CONFIG_PRINTK)
2824 kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
2825 "Display syslog buffer", 0, KDB_REPEAT_NONE);
2826#endif
2827 if (arch_kgdb_ops.enable_nmi) {
2828 kdb_register_repeat("disable_nmi", kdb_disable_nmi, "",
2829 "Disable NMI entry to KDB", 0, KDB_REPEAT_NONE);
2830 }
2831 kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2832 "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
2833 kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
2834 "Send a signal to a process", 0, KDB_REPEAT_NONE);
2835 kdb_register_repeat("summary", kdb_summary, "",
2836 "Summarize the system", 4, KDB_REPEAT_NONE);
2837 kdb_register_repeat("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2838 "Display per_cpu variables", 3, KDB_REPEAT_NONE);
2839 kdb_register_repeat("grephelp", kdb_grep_help, "",
2840 "Display help on | grep", 0, KDB_REPEAT_NONE);
2841}
2842
2843/* Execute any commands defined in kdb_cmds. */
2844static void __init kdb_cmd_init(void)
2845{
2846 int i, diag;
2847 for (i = 0; kdb_cmds[i]; ++i) {
2848 diag = kdb_parse(kdb_cmds[i]);
2849 if (diag)
2850 kdb_printf("kdb command %s failed, kdb diag %d\n",
2851 kdb_cmds[i], diag);
2852 }
2853 if (defcmd_in_progress) {
2854 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2855 kdb_parse("endefcmd");
2856 }
2857}
2858
2859/* Initialize kdb_printf, breakpoint tables and kdb state */
2860void __init kdb_init(int lvl)
2861{
2862 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2863 int i;
2864
2865 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2866 return;
2867 for (i = kdb_init_lvl; i < lvl; i++) {
2868 switch (i) {
2869 case KDB_NOT_INITIALIZED:
2870 kdb_inittab(); /* Initialize Command Table */
2871 kdb_initbptab(); /* Initialize Breakpoints */
2872 break;
2873 case KDB_INIT_EARLY:
2874 kdb_cmd_init(); /* Build kdb_cmds tables */
2875 break;
2876 }
2877 }
2878 kdb_init_lvl = lvl;
2879}
1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/string.h>
16#include <linux/kernel.h>
17#include <linux/kmsg_dump.h>
18#include <linux/reboot.h>
19#include <linux/sched.h>
20#include <linux/sysrq.h>
21#include <linux/smp.h>
22#include <linux/utsname.h>
23#include <linux/vmalloc.h>
24#include <linux/module.h>
25#include <linux/mm.h>
26#include <linux/init.h>
27#include <linux/kallsyms.h>
28#include <linux/kgdb.h>
29#include <linux/kdb.h>
30#include <linux/notifier.h>
31#include <linux/interrupt.h>
32#include <linux/delay.h>
33#include <linux/nmi.h>
34#include <linux/time.h>
35#include <linux/ptrace.h>
36#include <linux/sysctl.h>
37#include <linux/cpu.h>
38#include <linux/kdebug.h>
39#include <linux/proc_fs.h>
40#include <linux/uaccess.h>
41#include <linux/slab.h>
42#include "kdb_private.h"
43
44#define GREP_LEN 256
45char kdb_grep_string[GREP_LEN];
46int kdb_grepping_flag;
47EXPORT_SYMBOL(kdb_grepping_flag);
48int kdb_grep_leading;
49int kdb_grep_trailing;
50
51/*
52 * Kernel debugger state flags
53 */
54int kdb_flags;
55atomic_t kdb_event;
56
57/*
58 * kdb_lock protects updates to kdb_initial_cpu. Used to
59 * single thread processors through the kernel debugger.
60 */
61int kdb_initial_cpu = -1; /* cpu number that owns kdb */
62int kdb_nextline = 1;
63int kdb_state; /* General KDB state */
64
65struct task_struct *kdb_current_task;
66EXPORT_SYMBOL(kdb_current_task);
67struct pt_regs *kdb_current_regs;
68
69const char *kdb_diemsg;
70static int kdb_go_count;
71#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
72static unsigned int kdb_continue_catastrophic =
73 CONFIG_KDB_CONTINUE_CATASTROPHIC;
74#else
75static unsigned int kdb_continue_catastrophic;
76#endif
77
78/* kdb_commands describes the available commands. */
79static kdbtab_t *kdb_commands;
80#define KDB_BASE_CMD_MAX 50
81static int kdb_max_commands = KDB_BASE_CMD_MAX;
82static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
83#define for_each_kdbcmd(cmd, num) \
84 for ((cmd) = kdb_base_commands, (num) = 0; \
85 num < kdb_max_commands; \
86 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
87
88typedef struct _kdbmsg {
89 int km_diag; /* kdb diagnostic */
90 char *km_msg; /* Corresponding message text */
91} kdbmsg_t;
92
93#define KDBMSG(msgnum, text) \
94 { KDB_##msgnum, text }
95
96static kdbmsg_t kdbmsgs[] = {
97 KDBMSG(NOTFOUND, "Command Not Found"),
98 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
99 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
100 "8 is only allowed on 64 bit systems"),
101 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
102 KDBMSG(NOTENV, "Cannot find environment variable"),
103 KDBMSG(NOENVVALUE, "Environment variable should have value"),
104 KDBMSG(NOTIMP, "Command not implemented"),
105 KDBMSG(ENVFULL, "Environment full"),
106 KDBMSG(ENVBUFFULL, "Environment buffer full"),
107 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
108#ifdef CONFIG_CPU_XSCALE
109 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
110#else
111 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
112#endif
113 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
114 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
115 KDBMSG(BADMODE, "Invalid IDMODE"),
116 KDBMSG(BADINT, "Illegal numeric value"),
117 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
118 KDBMSG(BADREG, "Invalid register name"),
119 KDBMSG(BADCPUNUM, "Invalid cpu number"),
120 KDBMSG(BADLENGTH, "Invalid length field"),
121 KDBMSG(NOBP, "No Breakpoint exists"),
122 KDBMSG(BADADDR, "Invalid address"),
123};
124#undef KDBMSG
125
126static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t);
127
128
129/*
130 * Initial environment. This is all kept static and local to
131 * this file. We don't want to rely on the memory allocation
132 * mechanisms in the kernel, so we use a very limited allocate-only
133 * heap for new and altered environment variables. The entire
134 * environment is limited to a fixed number of entries (add more
135 * to __env[] if required) and a fixed amount of heap (add more to
136 * KDB_ENVBUFSIZE if required).
137 */
138
139static char *__env[] = {
140#if defined(CONFIG_SMP)
141 "PROMPT=[%d]kdb> ",
142 "MOREPROMPT=[%d]more> ",
143#else
144 "PROMPT=kdb> ",
145 "MOREPROMPT=more> ",
146#endif
147 "RADIX=16",
148 "MDCOUNT=8", /* lines of md output */
149 KDB_PLATFORM_ENV,
150 "DTABCOUNT=30",
151 "NOSECT=1",
152 (char *)0,
153 (char *)0,
154 (char *)0,
155 (char *)0,
156 (char *)0,
157 (char *)0,
158 (char *)0,
159 (char *)0,
160 (char *)0,
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176};
177
178static const int __nenv = (sizeof(__env) / sizeof(char *));
179
180struct task_struct *kdb_curr_task(int cpu)
181{
182 struct task_struct *p = curr_task(cpu);
183#ifdef _TIF_MCA_INIT
184 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
185 p = krp->p;
186#endif
187 return p;
188}
189
190/*
191 * kdbgetenv - This function will return the character string value of
192 * an environment variable.
193 * Parameters:
194 * match A character string representing an environment variable.
195 * Returns:
196 * NULL No environment variable matches 'match'
197 * char* Pointer to string value of environment variable.
198 */
199char *kdbgetenv(const char *match)
200{
201 char **ep = __env;
202 int matchlen = strlen(match);
203 int i;
204
205 for (i = 0; i < __nenv; i++) {
206 char *e = *ep++;
207
208 if (!e)
209 continue;
210
211 if ((strncmp(match, e, matchlen) == 0)
212 && ((e[matchlen] == '\0')
213 || (e[matchlen] == '='))) {
214 char *cp = strchr(e, '=');
215 return cp ? ++cp : "";
216 }
217 }
218 return NULL;
219}
220
221/*
222 * kdballocenv - This function is used to allocate bytes for
223 * environment entries.
224 * Parameters:
225 * match A character string representing a numeric value
226 * Outputs:
227 * *value the unsigned long representation of the env variable 'match'
228 * Returns:
229 * Zero on success, a kdb diagnostic on failure.
230 * Remarks:
231 * We use a static environment buffer (envbuffer) to hold the values
232 * of dynamically generated environment variables (see kdb_set). Buffer
233 * space once allocated is never free'd, so over time, the amount of space
234 * (currently 512 bytes) will be exhausted if env variables are changed
235 * frequently.
236 */
237static char *kdballocenv(size_t bytes)
238{
239#define KDB_ENVBUFSIZE 512
240 static char envbuffer[KDB_ENVBUFSIZE];
241 static int envbufsize;
242 char *ep = NULL;
243
244 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
245 ep = &envbuffer[envbufsize];
246 envbufsize += bytes;
247 }
248 return ep;
249}
250
251/*
252 * kdbgetulenv - This function will return the value of an unsigned
253 * long-valued environment variable.
254 * Parameters:
255 * match A character string representing a numeric value
256 * Outputs:
257 * *value the unsigned long represntation of the env variable 'match'
258 * Returns:
259 * Zero on success, a kdb diagnostic on failure.
260 */
261static int kdbgetulenv(const char *match, unsigned long *value)
262{
263 char *ep;
264
265 ep = kdbgetenv(match);
266 if (!ep)
267 return KDB_NOTENV;
268 if (strlen(ep) == 0)
269 return KDB_NOENVVALUE;
270
271 *value = simple_strtoul(ep, NULL, 0);
272
273 return 0;
274}
275
276/*
277 * kdbgetintenv - This function will return the value of an
278 * integer-valued environment variable.
279 * Parameters:
280 * match A character string representing an integer-valued env variable
281 * Outputs:
282 * *value the integer representation of the environment variable 'match'
283 * Returns:
284 * Zero on success, a kdb diagnostic on failure.
285 */
286int kdbgetintenv(const char *match, int *value)
287{
288 unsigned long val;
289 int diag;
290
291 diag = kdbgetulenv(match, &val);
292 if (!diag)
293 *value = (int) val;
294 return diag;
295}
296
297/*
298 * kdbgetularg - This function will convert a numeric string into an
299 * unsigned long value.
300 * Parameters:
301 * arg A character string representing a numeric value
302 * Outputs:
303 * *value the unsigned long represntation of arg.
304 * Returns:
305 * Zero on success, a kdb diagnostic on failure.
306 */
307int kdbgetularg(const char *arg, unsigned long *value)
308{
309 char *endp;
310 unsigned long val;
311
312 val = simple_strtoul(arg, &endp, 0);
313
314 if (endp == arg) {
315 /*
316 * Also try base 16, for us folks too lazy to type the
317 * leading 0x...
318 */
319 val = simple_strtoul(arg, &endp, 16);
320 if (endp == arg)
321 return KDB_BADINT;
322 }
323
324 *value = val;
325
326 return 0;
327}
328
329int kdbgetu64arg(const char *arg, u64 *value)
330{
331 char *endp;
332 u64 val;
333
334 val = simple_strtoull(arg, &endp, 0);
335
336 if (endp == arg) {
337
338 val = simple_strtoull(arg, &endp, 16);
339 if (endp == arg)
340 return KDB_BADINT;
341 }
342
343 *value = val;
344
345 return 0;
346}
347
348/*
349 * kdb_set - This function implements the 'set' command. Alter an
350 * existing environment variable or create a new one.
351 */
352int kdb_set(int argc, const char **argv)
353{
354 int i;
355 char *ep;
356 size_t varlen, vallen;
357
358 /*
359 * we can be invoked two ways:
360 * set var=value argv[1]="var", argv[2]="value"
361 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
362 * - if the latter, shift 'em down.
363 */
364 if (argc == 3) {
365 argv[2] = argv[3];
366 argc--;
367 }
368
369 if (argc != 2)
370 return KDB_ARGCOUNT;
371
372 /*
373 * Check for internal variables
374 */
375 if (strcmp(argv[1], "KDBDEBUG") == 0) {
376 unsigned int debugflags;
377 char *cp;
378
379 debugflags = simple_strtoul(argv[2], &cp, 0);
380 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
381 kdb_printf("kdb: illegal debug flags '%s'\n",
382 argv[2]);
383 return 0;
384 }
385 kdb_flags = (kdb_flags &
386 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
387 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
388
389 return 0;
390 }
391
392 /*
393 * Tokenizer squashed the '=' sign. argv[1] is variable
394 * name, argv[2] = value.
395 */
396 varlen = strlen(argv[1]);
397 vallen = strlen(argv[2]);
398 ep = kdballocenv(varlen + vallen + 2);
399 if (ep == (char *)0)
400 return KDB_ENVBUFFULL;
401
402 sprintf(ep, "%s=%s", argv[1], argv[2]);
403
404 ep[varlen+vallen+1] = '\0';
405
406 for (i = 0; i < __nenv; i++) {
407 if (__env[i]
408 && ((strncmp(__env[i], argv[1], varlen) == 0)
409 && ((__env[i][varlen] == '\0')
410 || (__env[i][varlen] == '=')))) {
411 __env[i] = ep;
412 return 0;
413 }
414 }
415
416 /*
417 * Wasn't existing variable. Fit into slot.
418 */
419 for (i = 0; i < __nenv-1; i++) {
420 if (__env[i] == (char *)0) {
421 __env[i] = ep;
422 return 0;
423 }
424 }
425
426 return KDB_ENVFULL;
427}
428
429static int kdb_check_regs(void)
430{
431 if (!kdb_current_regs) {
432 kdb_printf("No current kdb registers."
433 " You may need to select another task\n");
434 return KDB_BADREG;
435 }
436 return 0;
437}
438
439/*
440 * kdbgetaddrarg - This function is responsible for parsing an
441 * address-expression and returning the value of the expression,
442 * symbol name, and offset to the caller.
443 *
444 * The argument may consist of a numeric value (decimal or
445 * hexidecimal), a symbol name, a register name (preceded by the
446 * percent sign), an environment variable with a numeric value
447 * (preceded by a dollar sign) or a simple arithmetic expression
448 * consisting of a symbol name, +/-, and a numeric constant value
449 * (offset).
450 * Parameters:
451 * argc - count of arguments in argv
452 * argv - argument vector
453 * *nextarg - index to next unparsed argument in argv[]
454 * regs - Register state at time of KDB entry
455 * Outputs:
456 * *value - receives the value of the address-expression
457 * *offset - receives the offset specified, if any
458 * *name - receives the symbol name, if any
459 * *nextarg - index to next unparsed argument in argv[]
460 * Returns:
461 * zero is returned on success, a kdb diagnostic code is
462 * returned on error.
463 */
464int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
465 unsigned long *value, long *offset,
466 char **name)
467{
468 unsigned long addr;
469 unsigned long off = 0;
470 int positive;
471 int diag;
472 int found = 0;
473 char *symname;
474 char symbol = '\0';
475 char *cp;
476 kdb_symtab_t symtab;
477
478 /*
479 * Process arguments which follow the following syntax:
480 *
481 * symbol | numeric-address [+/- numeric-offset]
482 * %register
483 * $environment-variable
484 */
485
486 if (*nextarg > argc)
487 return KDB_ARGCOUNT;
488
489 symname = (char *)argv[*nextarg];
490
491 /*
492 * If there is no whitespace between the symbol
493 * or address and the '+' or '-' symbols, we
494 * remember the character and replace it with a
495 * null so the symbol/value can be properly parsed
496 */
497 cp = strpbrk(symname, "+-");
498 if (cp != NULL) {
499 symbol = *cp;
500 *cp++ = '\0';
501 }
502
503 if (symname[0] == '$') {
504 diag = kdbgetulenv(&symname[1], &addr);
505 if (diag)
506 return diag;
507 } else if (symname[0] == '%') {
508 diag = kdb_check_regs();
509 if (diag)
510 return diag;
511 /* Implement register values with % at a later time as it is
512 * arch optional.
513 */
514 return KDB_NOTIMP;
515 } else {
516 found = kdbgetsymval(symname, &symtab);
517 if (found) {
518 addr = symtab.sym_start;
519 } else {
520 diag = kdbgetularg(argv[*nextarg], &addr);
521 if (diag)
522 return diag;
523 }
524 }
525
526 if (!found)
527 found = kdbnearsym(addr, &symtab);
528
529 (*nextarg)++;
530
531 if (name)
532 *name = symname;
533 if (value)
534 *value = addr;
535 if (offset && name && *name)
536 *offset = addr - symtab.sym_start;
537
538 if ((*nextarg > argc)
539 && (symbol == '\0'))
540 return 0;
541
542 /*
543 * check for +/- and offset
544 */
545
546 if (symbol == '\0') {
547 if ((argv[*nextarg][0] != '+')
548 && (argv[*nextarg][0] != '-')) {
549 /*
550 * Not our argument. Return.
551 */
552 return 0;
553 } else {
554 positive = (argv[*nextarg][0] == '+');
555 (*nextarg)++;
556 }
557 } else
558 positive = (symbol == '+');
559
560 /*
561 * Now there must be an offset!
562 */
563 if ((*nextarg > argc)
564 && (symbol == '\0')) {
565 return KDB_INVADDRFMT;
566 }
567
568 if (!symbol) {
569 cp = (char *)argv[*nextarg];
570 (*nextarg)++;
571 }
572
573 diag = kdbgetularg(cp, &off);
574 if (diag)
575 return diag;
576
577 if (!positive)
578 off = -off;
579
580 if (offset)
581 *offset += off;
582
583 if (value)
584 *value += off;
585
586 return 0;
587}
588
589static void kdb_cmderror(int diag)
590{
591 int i;
592
593 if (diag >= 0) {
594 kdb_printf("no error detected (diagnostic is %d)\n", diag);
595 return;
596 }
597
598 for (i = 0; i < __nkdb_err; i++) {
599 if (kdbmsgs[i].km_diag == diag) {
600 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
601 return;
602 }
603 }
604
605 kdb_printf("Unknown diag %d\n", -diag);
606}
607
608/*
609 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
610 * command which defines one command as a set of other commands,
611 * terminated by endefcmd. kdb_defcmd processes the initial
612 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
613 * the following commands until 'endefcmd'.
614 * Inputs:
615 * argc argument count
616 * argv argument vector
617 * Returns:
618 * zero for success, a kdb diagnostic if error
619 */
620struct defcmd_set {
621 int count;
622 int usable;
623 char *name;
624 char *usage;
625 char *help;
626 char **command;
627};
628static struct defcmd_set *defcmd_set;
629static int defcmd_set_count;
630static int defcmd_in_progress;
631
632/* Forward references */
633static int kdb_exec_defcmd(int argc, const char **argv);
634
635static int kdb_defcmd2(const char *cmdstr, const char *argv0)
636{
637 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
638 char **save_command = s->command;
639 if (strcmp(argv0, "endefcmd") == 0) {
640 defcmd_in_progress = 0;
641 if (!s->count)
642 s->usable = 0;
643 if (s->usable)
644 kdb_register(s->name, kdb_exec_defcmd,
645 s->usage, s->help, 0);
646 return 0;
647 }
648 if (!s->usable)
649 return KDB_NOTIMP;
650 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
651 if (!s->command) {
652 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
653 cmdstr);
654 s->usable = 0;
655 return KDB_NOTIMP;
656 }
657 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
658 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
659 kfree(save_command);
660 return 0;
661}
662
663static int kdb_defcmd(int argc, const char **argv)
664{
665 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
666 if (defcmd_in_progress) {
667 kdb_printf("kdb: nested defcmd detected, assuming missing "
668 "endefcmd\n");
669 kdb_defcmd2("endefcmd", "endefcmd");
670 }
671 if (argc == 0) {
672 int i;
673 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
674 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
675 s->usage, s->help);
676 for (i = 0; i < s->count; ++i)
677 kdb_printf("%s", s->command[i]);
678 kdb_printf("endefcmd\n");
679 }
680 return 0;
681 }
682 if (argc != 3)
683 return KDB_ARGCOUNT;
684 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
685 GFP_KDB);
686 if (!defcmd_set) {
687 kdb_printf("Could not allocate new defcmd_set entry for %s\n",
688 argv[1]);
689 defcmd_set = save_defcmd_set;
690 return KDB_NOTIMP;
691 }
692 memcpy(defcmd_set, save_defcmd_set,
693 defcmd_set_count * sizeof(*defcmd_set));
694 kfree(save_defcmd_set);
695 s = defcmd_set + defcmd_set_count;
696 memset(s, 0, sizeof(*s));
697 s->usable = 1;
698 s->name = kdb_strdup(argv[1], GFP_KDB);
699 s->usage = kdb_strdup(argv[2], GFP_KDB);
700 s->help = kdb_strdup(argv[3], GFP_KDB);
701 if (s->usage[0] == '"') {
702 strcpy(s->usage, s->usage+1);
703 s->usage[strlen(s->usage)-1] = '\0';
704 }
705 if (s->help[0] == '"') {
706 strcpy(s->help, s->help+1);
707 s->help[strlen(s->help)-1] = '\0';
708 }
709 ++defcmd_set_count;
710 defcmd_in_progress = 1;
711 return 0;
712}
713
714/*
715 * kdb_exec_defcmd - Execute the set of commands associated with this
716 * defcmd name.
717 * Inputs:
718 * argc argument count
719 * argv argument vector
720 * Returns:
721 * zero for success, a kdb diagnostic if error
722 */
723static int kdb_exec_defcmd(int argc, const char **argv)
724{
725 int i, ret;
726 struct defcmd_set *s;
727 if (argc != 0)
728 return KDB_ARGCOUNT;
729 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
730 if (strcmp(s->name, argv[0]) == 0)
731 break;
732 }
733 if (i == defcmd_set_count) {
734 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
735 argv[0]);
736 return KDB_NOTIMP;
737 }
738 for (i = 0; i < s->count; ++i) {
739 /* Recursive use of kdb_parse, do not use argv after
740 * this point */
741 argv = NULL;
742 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
743 ret = kdb_parse(s->command[i]);
744 if (ret)
745 return ret;
746 }
747 return 0;
748}
749
750/* Command history */
751#define KDB_CMD_HISTORY_COUNT 32
752#define CMD_BUFLEN 200 /* kdb_printf: max printline
753 * size == 256 */
754static unsigned int cmd_head, cmd_tail;
755static unsigned int cmdptr;
756static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
757static char cmd_cur[CMD_BUFLEN];
758
759/*
760 * The "str" argument may point to something like | grep xyz
761 */
762static void parse_grep(const char *str)
763{
764 int len;
765 char *cp = (char *)str, *cp2;
766
767 /* sanity check: we should have been called with the \ first */
768 if (*cp != '|')
769 return;
770 cp++;
771 while (isspace(*cp))
772 cp++;
773 if (strncmp(cp, "grep ", 5)) {
774 kdb_printf("invalid 'pipe', see grephelp\n");
775 return;
776 }
777 cp += 5;
778 while (isspace(*cp))
779 cp++;
780 cp2 = strchr(cp, '\n');
781 if (cp2)
782 *cp2 = '\0'; /* remove the trailing newline */
783 len = strlen(cp);
784 if (len == 0) {
785 kdb_printf("invalid 'pipe', see grephelp\n");
786 return;
787 }
788 /* now cp points to a nonzero length search string */
789 if (*cp == '"') {
790 /* allow it be "x y z" by removing the "'s - there must
791 be two of them */
792 cp++;
793 cp2 = strchr(cp, '"');
794 if (!cp2) {
795 kdb_printf("invalid quoted string, see grephelp\n");
796 return;
797 }
798 *cp2 = '\0'; /* end the string where the 2nd " was */
799 }
800 kdb_grep_leading = 0;
801 if (*cp == '^') {
802 kdb_grep_leading = 1;
803 cp++;
804 }
805 len = strlen(cp);
806 kdb_grep_trailing = 0;
807 if (*(cp+len-1) == '$') {
808 kdb_grep_trailing = 1;
809 *(cp+len-1) = '\0';
810 }
811 len = strlen(cp);
812 if (!len)
813 return;
814 if (len >= GREP_LEN) {
815 kdb_printf("search string too long\n");
816 return;
817 }
818 strcpy(kdb_grep_string, cp);
819 kdb_grepping_flag++;
820 return;
821}
822
823/*
824 * kdb_parse - Parse the command line, search the command table for a
825 * matching command and invoke the command function. This
826 * function may be called recursively, if it is, the second call
827 * will overwrite argv and cbuf. It is the caller's
828 * responsibility to save their argv if they recursively call
829 * kdb_parse().
830 * Parameters:
831 * cmdstr The input command line to be parsed.
832 * regs The registers at the time kdb was entered.
833 * Returns:
834 * Zero for success, a kdb diagnostic if failure.
835 * Remarks:
836 * Limited to 20 tokens.
837 *
838 * Real rudimentary tokenization. Basically only whitespace
839 * is considered a token delimeter (but special consideration
840 * is taken of the '=' sign as used by the 'set' command).
841 *
842 * The algorithm used to tokenize the input string relies on
843 * there being at least one whitespace (or otherwise useless)
844 * character between tokens as the character immediately following
845 * the token is altered in-place to a null-byte to terminate the
846 * token string.
847 */
848
849#define MAXARGC 20
850
851int kdb_parse(const char *cmdstr)
852{
853 static char *argv[MAXARGC];
854 static int argc;
855 static char cbuf[CMD_BUFLEN+2];
856 char *cp;
857 char *cpp, quoted;
858 kdbtab_t *tp;
859 int i, escaped, ignore_errors = 0, check_grep;
860
861 /*
862 * First tokenize the command string.
863 */
864 cp = (char *)cmdstr;
865 kdb_grepping_flag = check_grep = 0;
866
867 if (KDB_FLAG(CMD_INTERRUPT)) {
868 /* Previous command was interrupted, newline must not
869 * repeat the command */
870 KDB_FLAG_CLEAR(CMD_INTERRUPT);
871 KDB_STATE_SET(PAGER);
872 argc = 0; /* no repeat */
873 }
874
875 if (*cp != '\n' && *cp != '\0') {
876 argc = 0;
877 cpp = cbuf;
878 while (*cp) {
879 /* skip whitespace */
880 while (isspace(*cp))
881 cp++;
882 if ((*cp == '\0') || (*cp == '\n') ||
883 (*cp == '#' && !defcmd_in_progress))
884 break;
885 /* special case: check for | grep pattern */
886 if (*cp == '|') {
887 check_grep++;
888 break;
889 }
890 if (cpp >= cbuf + CMD_BUFLEN) {
891 kdb_printf("kdb_parse: command buffer "
892 "overflow, command ignored\n%s\n",
893 cmdstr);
894 return KDB_NOTFOUND;
895 }
896 if (argc >= MAXARGC - 1) {
897 kdb_printf("kdb_parse: too many arguments, "
898 "command ignored\n%s\n", cmdstr);
899 return KDB_NOTFOUND;
900 }
901 argv[argc++] = cpp;
902 escaped = 0;
903 quoted = '\0';
904 /* Copy to next unquoted and unescaped
905 * whitespace or '=' */
906 while (*cp && *cp != '\n' &&
907 (escaped || quoted || !isspace(*cp))) {
908 if (cpp >= cbuf + CMD_BUFLEN)
909 break;
910 if (escaped) {
911 escaped = 0;
912 *cpp++ = *cp++;
913 continue;
914 }
915 if (*cp == '\\') {
916 escaped = 1;
917 ++cp;
918 continue;
919 }
920 if (*cp == quoted)
921 quoted = '\0';
922 else if (*cp == '\'' || *cp == '"')
923 quoted = *cp;
924 *cpp = *cp++;
925 if (*cpp == '=' && !quoted)
926 break;
927 ++cpp;
928 }
929 *cpp++ = '\0'; /* Squash a ws or '=' character */
930 }
931 }
932 if (!argc)
933 return 0;
934 if (check_grep)
935 parse_grep(cp);
936 if (defcmd_in_progress) {
937 int result = kdb_defcmd2(cmdstr, argv[0]);
938 if (!defcmd_in_progress) {
939 argc = 0; /* avoid repeat on endefcmd */
940 *(argv[0]) = '\0';
941 }
942 return result;
943 }
944 if (argv[0][0] == '-' && argv[0][1] &&
945 (argv[0][1] < '0' || argv[0][1] > '9')) {
946 ignore_errors = 1;
947 ++argv[0];
948 }
949
950 for_each_kdbcmd(tp, i) {
951 if (tp->cmd_name) {
952 /*
953 * If this command is allowed to be abbreviated,
954 * check to see if this is it.
955 */
956
957 if (tp->cmd_minlen
958 && (strlen(argv[0]) <= tp->cmd_minlen)) {
959 if (strncmp(argv[0],
960 tp->cmd_name,
961 tp->cmd_minlen) == 0) {
962 break;
963 }
964 }
965
966 if (strcmp(argv[0], tp->cmd_name) == 0)
967 break;
968 }
969 }
970
971 /*
972 * If we don't find a command by this name, see if the first
973 * few characters of this match any of the known commands.
974 * e.g., md1c20 should match md.
975 */
976 if (i == kdb_max_commands) {
977 for_each_kdbcmd(tp, i) {
978 if (tp->cmd_name) {
979 if (strncmp(argv[0],
980 tp->cmd_name,
981 strlen(tp->cmd_name)) == 0) {
982 break;
983 }
984 }
985 }
986 }
987
988 if (i < kdb_max_commands) {
989 int result;
990 KDB_STATE_SET(CMD);
991 result = (*tp->cmd_func)(argc-1, (const char **)argv);
992 if (result && ignore_errors && result > KDB_CMD_GO)
993 result = 0;
994 KDB_STATE_CLEAR(CMD);
995 switch (tp->cmd_repeat) {
996 case KDB_REPEAT_NONE:
997 argc = 0;
998 if (argv[0])
999 *(argv[0]) = '\0';
1000 break;
1001 case KDB_REPEAT_NO_ARGS:
1002 argc = 1;
1003 if (argv[1])
1004 *(argv[1]) = '\0';
1005 break;
1006 case KDB_REPEAT_WITH_ARGS:
1007 break;
1008 }
1009 return result;
1010 }
1011
1012 /*
1013 * If the input with which we were presented does not
1014 * map to an existing command, attempt to parse it as an
1015 * address argument and display the result. Useful for
1016 * obtaining the address of a variable, or the nearest symbol
1017 * to an address contained in a register.
1018 */
1019 {
1020 unsigned long value;
1021 char *name = NULL;
1022 long offset;
1023 int nextarg = 0;
1024
1025 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1026 &value, &offset, &name)) {
1027 return KDB_NOTFOUND;
1028 }
1029
1030 kdb_printf("%s = ", argv[0]);
1031 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1032 kdb_printf("\n");
1033 return 0;
1034 }
1035}
1036
1037
1038static int handle_ctrl_cmd(char *cmd)
1039{
1040#define CTRL_P 16
1041#define CTRL_N 14
1042
1043 /* initial situation */
1044 if (cmd_head == cmd_tail)
1045 return 0;
1046 switch (*cmd) {
1047 case CTRL_P:
1048 if (cmdptr != cmd_tail)
1049 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1050 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1051 return 1;
1052 case CTRL_N:
1053 if (cmdptr != cmd_head)
1054 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1055 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1056 return 1;
1057 }
1058 return 0;
1059}
1060
1061/*
1062 * kdb_reboot - This function implements the 'reboot' command. Reboot
1063 * the system immediately, or loop for ever on failure.
1064 */
1065static int kdb_reboot(int argc, const char **argv)
1066{
1067 emergency_restart();
1068 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1069 while (1)
1070 cpu_relax();
1071 /* NOTREACHED */
1072 return 0;
1073}
1074
1075static void kdb_dumpregs(struct pt_regs *regs)
1076{
1077 int old_lvl = console_loglevel;
1078 console_loglevel = 15;
1079 kdb_trap_printk++;
1080 show_regs(regs);
1081 kdb_trap_printk--;
1082 kdb_printf("\n");
1083 console_loglevel = old_lvl;
1084}
1085
1086void kdb_set_current_task(struct task_struct *p)
1087{
1088 kdb_current_task = p;
1089
1090 if (kdb_task_has_cpu(p)) {
1091 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1092 return;
1093 }
1094 kdb_current_regs = NULL;
1095}
1096
1097/*
1098 * kdb_local - The main code for kdb. This routine is invoked on a
1099 * specific processor, it is not global. The main kdb() routine
1100 * ensures that only one processor at a time is in this routine.
1101 * This code is called with the real reason code on the first
1102 * entry to a kdb session, thereafter it is called with reason
1103 * SWITCH, even if the user goes back to the original cpu.
1104 * Inputs:
1105 * reason The reason KDB was invoked
1106 * error The hardware-defined error code
1107 * regs The exception frame at time of fault/breakpoint.
1108 * db_result Result code from the break or debug point.
1109 * Returns:
1110 * 0 KDB was invoked for an event which it wasn't responsible
1111 * 1 KDB handled the event for which it was invoked.
1112 * KDB_CMD_GO User typed 'go'.
1113 * KDB_CMD_CPU User switched to another cpu.
1114 * KDB_CMD_SS Single step.
1115 * KDB_CMD_SSB Single step until branch.
1116 */
1117static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1118 kdb_dbtrap_t db_result)
1119{
1120 char *cmdbuf;
1121 int diag;
1122 struct task_struct *kdb_current =
1123 kdb_curr_task(raw_smp_processor_id());
1124
1125 KDB_DEBUG_STATE("kdb_local 1", reason);
1126 kdb_go_count = 0;
1127 if (reason == KDB_REASON_DEBUG) {
1128 /* special case below */
1129 } else {
1130 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1131 kdb_current, kdb_current ? kdb_current->pid : 0);
1132#if defined(CONFIG_SMP)
1133 kdb_printf("on processor %d ", raw_smp_processor_id());
1134#endif
1135 }
1136
1137 switch (reason) {
1138 case KDB_REASON_DEBUG:
1139 {
1140 /*
1141 * If re-entering kdb after a single step
1142 * command, don't print the message.
1143 */
1144 switch (db_result) {
1145 case KDB_DB_BPT:
1146 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1147 kdb_current, kdb_current->pid);
1148#if defined(CONFIG_SMP)
1149 kdb_printf("on processor %d ", raw_smp_processor_id());
1150#endif
1151 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1152 instruction_pointer(regs));
1153 break;
1154 case KDB_DB_SSB:
1155 /*
1156 * In the midst of ssb command. Just return.
1157 */
1158 KDB_DEBUG_STATE("kdb_local 3", reason);
1159 return KDB_CMD_SSB; /* Continue with SSB command */
1160
1161 break;
1162 case KDB_DB_SS:
1163 break;
1164 case KDB_DB_SSBPT:
1165 KDB_DEBUG_STATE("kdb_local 4", reason);
1166 return 1; /* kdba_db_trap did the work */
1167 default:
1168 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1169 db_result);
1170 break;
1171 }
1172
1173 }
1174 break;
1175 case KDB_REASON_ENTER:
1176 if (KDB_STATE(KEYBOARD))
1177 kdb_printf("due to Keyboard Entry\n");
1178 else
1179 kdb_printf("due to KDB_ENTER()\n");
1180 break;
1181 case KDB_REASON_KEYBOARD:
1182 KDB_STATE_SET(KEYBOARD);
1183 kdb_printf("due to Keyboard Entry\n");
1184 break;
1185 case KDB_REASON_ENTER_SLAVE:
1186 /* drop through, slaves only get released via cpu switch */
1187 case KDB_REASON_SWITCH:
1188 kdb_printf("due to cpu switch\n");
1189 break;
1190 case KDB_REASON_OOPS:
1191 kdb_printf("Oops: %s\n", kdb_diemsg);
1192 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1193 instruction_pointer(regs));
1194 kdb_dumpregs(regs);
1195 break;
1196 case KDB_REASON_NMI:
1197 kdb_printf("due to NonMaskable Interrupt @ "
1198 kdb_machreg_fmt "\n",
1199 instruction_pointer(regs));
1200 kdb_dumpregs(regs);
1201 break;
1202 case KDB_REASON_SSTEP:
1203 case KDB_REASON_BREAK:
1204 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1205 reason == KDB_REASON_BREAK ?
1206 "Breakpoint" : "SS trap", instruction_pointer(regs));
1207 /*
1208 * Determine if this breakpoint is one that we
1209 * are interested in.
1210 */
1211 if (db_result != KDB_DB_BPT) {
1212 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1213 db_result);
1214 KDB_DEBUG_STATE("kdb_local 6", reason);
1215 return 0; /* Not for us, dismiss it */
1216 }
1217 break;
1218 case KDB_REASON_RECURSE:
1219 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1220 instruction_pointer(regs));
1221 break;
1222 default:
1223 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1224 KDB_DEBUG_STATE("kdb_local 8", reason);
1225 return 0; /* Not for us, dismiss it */
1226 }
1227
1228 while (1) {
1229 /*
1230 * Initialize pager context.
1231 */
1232 kdb_nextline = 1;
1233 KDB_STATE_CLEAR(SUPPRESS);
1234
1235 cmdbuf = cmd_cur;
1236 *cmdbuf = '\0';
1237 *(cmd_hist[cmd_head]) = '\0';
1238
1239 if (KDB_FLAG(ONLY_DO_DUMP)) {
1240 /* kdb is off but a catastrophic error requires a dump.
1241 * Take the dump and reboot.
1242 * Turn on logging so the kdb output appears in the log
1243 * buffer in the dump.
1244 */
1245 const char *setargs[] = { "set", "LOGGING", "1" };
1246 kdb_set(2, setargs);
1247 kdb_reboot(0, NULL);
1248 /*NOTREACHED*/
1249 }
1250
1251do_full_getstr:
1252#if defined(CONFIG_SMP)
1253 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1254 raw_smp_processor_id());
1255#else
1256 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1257#endif
1258 if (defcmd_in_progress)
1259 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1260
1261 /*
1262 * Fetch command from keyboard
1263 */
1264 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1265 if (*cmdbuf != '\n') {
1266 if (*cmdbuf < 32) {
1267 if (cmdptr == cmd_head) {
1268 strncpy(cmd_hist[cmd_head], cmd_cur,
1269 CMD_BUFLEN);
1270 *(cmd_hist[cmd_head] +
1271 strlen(cmd_hist[cmd_head])-1) = '\0';
1272 }
1273 if (!handle_ctrl_cmd(cmdbuf))
1274 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1275 cmdbuf = cmd_cur;
1276 goto do_full_getstr;
1277 } else {
1278 strncpy(cmd_hist[cmd_head], cmd_cur,
1279 CMD_BUFLEN);
1280 }
1281
1282 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1283 if (cmd_head == cmd_tail)
1284 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1285 }
1286
1287 cmdptr = cmd_head;
1288 diag = kdb_parse(cmdbuf);
1289 if (diag == KDB_NOTFOUND) {
1290 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1291 diag = 0;
1292 }
1293 if (diag == KDB_CMD_GO
1294 || diag == KDB_CMD_CPU
1295 || diag == KDB_CMD_SS
1296 || diag == KDB_CMD_SSB
1297 || diag == KDB_CMD_KGDB)
1298 break;
1299
1300 if (diag)
1301 kdb_cmderror(diag);
1302 }
1303 KDB_DEBUG_STATE("kdb_local 9", diag);
1304 return diag;
1305}
1306
1307
1308/*
1309 * kdb_print_state - Print the state data for the current processor
1310 * for debugging.
1311 * Inputs:
1312 * text Identifies the debug point
1313 * value Any integer value to be printed, e.g. reason code.
1314 */
1315void kdb_print_state(const char *text, int value)
1316{
1317 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1318 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1319 kdb_state);
1320}
1321
1322/*
1323 * kdb_main_loop - After initial setup and assignment of the
1324 * controlling cpu, all cpus are in this loop. One cpu is in
1325 * control and will issue the kdb prompt, the others will spin
1326 * until 'go' or cpu switch.
1327 *
1328 * To get a consistent view of the kernel stacks for all
1329 * processes, this routine is invoked from the main kdb code via
1330 * an architecture specific routine. kdba_main_loop is
1331 * responsible for making the kernel stacks consistent for all
1332 * processes, there should be no difference between a blocked
1333 * process and a running process as far as kdb is concerned.
1334 * Inputs:
1335 * reason The reason KDB was invoked
1336 * error The hardware-defined error code
1337 * reason2 kdb's current reason code.
1338 * Initially error but can change
1339 * according to kdb state.
1340 * db_result Result code from break or debug point.
1341 * regs The exception frame at time of fault/breakpoint.
1342 * should always be valid.
1343 * Returns:
1344 * 0 KDB was invoked for an event which it wasn't responsible
1345 * 1 KDB handled the event for which it was invoked.
1346 */
1347int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1348 kdb_dbtrap_t db_result, struct pt_regs *regs)
1349{
1350 int result = 1;
1351 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1352 while (1) {
1353 /*
1354 * All processors except the one that is in control
1355 * will spin here.
1356 */
1357 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1358 while (KDB_STATE(HOLD_CPU)) {
1359 /* state KDB is turned off by kdb_cpu to see if the
1360 * other cpus are still live, each cpu in this loop
1361 * turns it back on.
1362 */
1363 if (!KDB_STATE(KDB))
1364 KDB_STATE_SET(KDB);
1365 }
1366
1367 KDB_STATE_CLEAR(SUPPRESS);
1368 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1369 if (KDB_STATE(LEAVING))
1370 break; /* Another cpu said 'go' */
1371 /* Still using kdb, this processor is in control */
1372 result = kdb_local(reason2, error, regs, db_result);
1373 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1374
1375 if (result == KDB_CMD_CPU)
1376 break;
1377
1378 if (result == KDB_CMD_SS) {
1379 KDB_STATE_SET(DOING_SS);
1380 break;
1381 }
1382
1383 if (result == KDB_CMD_SSB) {
1384 KDB_STATE_SET(DOING_SS);
1385 KDB_STATE_SET(DOING_SSB);
1386 break;
1387 }
1388
1389 if (result == KDB_CMD_KGDB) {
1390 if (!KDB_STATE(DOING_KGDB))
1391 kdb_printf("Entering please attach debugger "
1392 "or use $D#44+ or $3#33\n");
1393 break;
1394 }
1395 if (result && result != 1 && result != KDB_CMD_GO)
1396 kdb_printf("\nUnexpected kdb_local return code %d\n",
1397 result);
1398 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1399 break;
1400 }
1401 if (KDB_STATE(DOING_SS))
1402 KDB_STATE_CLEAR(SSBPT);
1403
1404 /* Clean up any keyboard devices before leaving */
1405 kdb_kbd_cleanup_state();
1406
1407 return result;
1408}
1409
1410/*
1411 * kdb_mdr - This function implements the guts of the 'mdr', memory
1412 * read command.
1413 * mdr <addr arg>,<byte count>
1414 * Inputs:
1415 * addr Start address
1416 * count Number of bytes
1417 * Returns:
1418 * Always 0. Any errors are detected and printed by kdb_getarea.
1419 */
1420static int kdb_mdr(unsigned long addr, unsigned int count)
1421{
1422 unsigned char c;
1423 while (count--) {
1424 if (kdb_getarea(c, addr))
1425 return 0;
1426 kdb_printf("%02x", c);
1427 addr++;
1428 }
1429 kdb_printf("\n");
1430 return 0;
1431}
1432
1433/*
1434 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1435 * 'md8' 'mdr' and 'mds' commands.
1436 *
1437 * md|mds [<addr arg> [<line count> [<radix>]]]
1438 * mdWcN [<addr arg> [<line count> [<radix>]]]
1439 * where W = is the width (1, 2, 4 or 8) and N is the count.
1440 * for eg., md1c20 reads 20 bytes, 1 at a time.
1441 * mdr <addr arg>,<byte count>
1442 */
1443static void kdb_md_line(const char *fmtstr, unsigned long addr,
1444 int symbolic, int nosect, int bytesperword,
1445 int num, int repeat, int phys)
1446{
1447 /* print just one line of data */
1448 kdb_symtab_t symtab;
1449 char cbuf[32];
1450 char *c = cbuf;
1451 int i;
1452 unsigned long word;
1453
1454 memset(cbuf, '\0', sizeof(cbuf));
1455 if (phys)
1456 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1457 else
1458 kdb_printf(kdb_machreg_fmt0 " ", addr);
1459
1460 for (i = 0; i < num && repeat--; i++) {
1461 if (phys) {
1462 if (kdb_getphysword(&word, addr, bytesperword))
1463 break;
1464 } else if (kdb_getword(&word, addr, bytesperword))
1465 break;
1466 kdb_printf(fmtstr, word);
1467 if (symbolic)
1468 kdbnearsym(word, &symtab);
1469 else
1470 memset(&symtab, 0, sizeof(symtab));
1471 if (symtab.sym_name) {
1472 kdb_symbol_print(word, &symtab, 0);
1473 if (!nosect) {
1474 kdb_printf("\n");
1475 kdb_printf(" %s %s "
1476 kdb_machreg_fmt " "
1477 kdb_machreg_fmt " "
1478 kdb_machreg_fmt, symtab.mod_name,
1479 symtab.sec_name, symtab.sec_start,
1480 symtab.sym_start, symtab.sym_end);
1481 }
1482 addr += bytesperword;
1483 } else {
1484 union {
1485 u64 word;
1486 unsigned char c[8];
1487 } wc;
1488 unsigned char *cp;
1489#ifdef __BIG_ENDIAN
1490 cp = wc.c + 8 - bytesperword;
1491#else
1492 cp = wc.c;
1493#endif
1494 wc.word = word;
1495#define printable_char(c) \
1496 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1497 switch (bytesperword) {
1498 case 8:
1499 *c++ = printable_char(*cp++);
1500 *c++ = printable_char(*cp++);
1501 *c++ = printable_char(*cp++);
1502 *c++ = printable_char(*cp++);
1503 addr += 4;
1504 case 4:
1505 *c++ = printable_char(*cp++);
1506 *c++ = printable_char(*cp++);
1507 addr += 2;
1508 case 2:
1509 *c++ = printable_char(*cp++);
1510 addr++;
1511 case 1:
1512 *c++ = printable_char(*cp++);
1513 addr++;
1514 break;
1515 }
1516#undef printable_char
1517 }
1518 }
1519 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1520 " ", cbuf);
1521}
1522
1523static int kdb_md(int argc, const char **argv)
1524{
1525 static unsigned long last_addr;
1526 static int last_radix, last_bytesperword, last_repeat;
1527 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1528 int nosect = 0;
1529 char fmtchar, fmtstr[64];
1530 unsigned long addr;
1531 unsigned long word;
1532 long offset = 0;
1533 int symbolic = 0;
1534 int valid = 0;
1535 int phys = 0;
1536
1537 kdbgetintenv("MDCOUNT", &mdcount);
1538 kdbgetintenv("RADIX", &radix);
1539 kdbgetintenv("BYTESPERWORD", &bytesperword);
1540
1541 /* Assume 'md <addr>' and start with environment values */
1542 repeat = mdcount * 16 / bytesperword;
1543
1544 if (strcmp(argv[0], "mdr") == 0) {
1545 if (argc != 2)
1546 return KDB_ARGCOUNT;
1547 valid = 1;
1548 } else if (isdigit(argv[0][2])) {
1549 bytesperword = (int)(argv[0][2] - '0');
1550 if (bytesperword == 0) {
1551 bytesperword = last_bytesperword;
1552 if (bytesperword == 0)
1553 bytesperword = 4;
1554 }
1555 last_bytesperword = bytesperword;
1556 repeat = mdcount * 16 / bytesperword;
1557 if (!argv[0][3])
1558 valid = 1;
1559 else if (argv[0][3] == 'c' && argv[0][4]) {
1560 char *p;
1561 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1562 mdcount = ((repeat * bytesperword) + 15) / 16;
1563 valid = !*p;
1564 }
1565 last_repeat = repeat;
1566 } else if (strcmp(argv[0], "md") == 0)
1567 valid = 1;
1568 else if (strcmp(argv[0], "mds") == 0)
1569 valid = 1;
1570 else if (strcmp(argv[0], "mdp") == 0) {
1571 phys = valid = 1;
1572 }
1573 if (!valid)
1574 return KDB_NOTFOUND;
1575
1576 if (argc == 0) {
1577 if (last_addr == 0)
1578 return KDB_ARGCOUNT;
1579 addr = last_addr;
1580 radix = last_radix;
1581 bytesperword = last_bytesperword;
1582 repeat = last_repeat;
1583 mdcount = ((repeat * bytesperword) + 15) / 16;
1584 }
1585
1586 if (argc) {
1587 unsigned long val;
1588 int diag, nextarg = 1;
1589 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1590 &offset, NULL);
1591 if (diag)
1592 return diag;
1593 if (argc > nextarg+2)
1594 return KDB_ARGCOUNT;
1595
1596 if (argc >= nextarg) {
1597 diag = kdbgetularg(argv[nextarg], &val);
1598 if (!diag) {
1599 mdcount = (int) val;
1600 repeat = mdcount * 16 / bytesperword;
1601 }
1602 }
1603 if (argc >= nextarg+1) {
1604 diag = kdbgetularg(argv[nextarg+1], &val);
1605 if (!diag)
1606 radix = (int) val;
1607 }
1608 }
1609
1610 if (strcmp(argv[0], "mdr") == 0)
1611 return kdb_mdr(addr, mdcount);
1612
1613 switch (radix) {
1614 case 10:
1615 fmtchar = 'd';
1616 break;
1617 case 16:
1618 fmtchar = 'x';
1619 break;
1620 case 8:
1621 fmtchar = 'o';
1622 break;
1623 default:
1624 return KDB_BADRADIX;
1625 }
1626
1627 last_radix = radix;
1628
1629 if (bytesperword > KDB_WORD_SIZE)
1630 return KDB_BADWIDTH;
1631
1632 switch (bytesperword) {
1633 case 8:
1634 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1635 break;
1636 case 4:
1637 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1638 break;
1639 case 2:
1640 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1641 break;
1642 case 1:
1643 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1644 break;
1645 default:
1646 return KDB_BADWIDTH;
1647 }
1648
1649 last_repeat = repeat;
1650 last_bytesperword = bytesperword;
1651
1652 if (strcmp(argv[0], "mds") == 0) {
1653 symbolic = 1;
1654 /* Do not save these changes as last_*, they are temporary mds
1655 * overrides.
1656 */
1657 bytesperword = KDB_WORD_SIZE;
1658 repeat = mdcount;
1659 kdbgetintenv("NOSECT", &nosect);
1660 }
1661
1662 /* Round address down modulo BYTESPERWORD */
1663
1664 addr &= ~(bytesperword-1);
1665
1666 while (repeat > 0) {
1667 unsigned long a;
1668 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1669
1670 if (KDB_FLAG(CMD_INTERRUPT))
1671 return 0;
1672 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1673 if (phys) {
1674 if (kdb_getphysword(&word, a, bytesperword)
1675 || word)
1676 break;
1677 } else if (kdb_getword(&word, a, bytesperword) || word)
1678 break;
1679 }
1680 n = min(num, repeat);
1681 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1682 num, repeat, phys);
1683 addr += bytesperword * n;
1684 repeat -= n;
1685 z = (z + num - 1) / num;
1686 if (z > 2) {
1687 int s = num * (z-2);
1688 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1689 " zero suppressed\n",
1690 addr, addr + bytesperword * s - 1);
1691 addr += bytesperword * s;
1692 repeat -= s;
1693 }
1694 }
1695 last_addr = addr;
1696
1697 return 0;
1698}
1699
1700/*
1701 * kdb_mm - This function implements the 'mm' command.
1702 * mm address-expression new-value
1703 * Remarks:
1704 * mm works on machine words, mmW works on bytes.
1705 */
1706static int kdb_mm(int argc, const char **argv)
1707{
1708 int diag;
1709 unsigned long addr;
1710 long offset = 0;
1711 unsigned long contents;
1712 int nextarg;
1713 int width;
1714
1715 if (argv[0][2] && !isdigit(argv[0][2]))
1716 return KDB_NOTFOUND;
1717
1718 if (argc < 2)
1719 return KDB_ARGCOUNT;
1720
1721 nextarg = 1;
1722 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1723 if (diag)
1724 return diag;
1725
1726 if (nextarg > argc)
1727 return KDB_ARGCOUNT;
1728 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1729 if (diag)
1730 return diag;
1731
1732 if (nextarg != argc + 1)
1733 return KDB_ARGCOUNT;
1734
1735 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1736 diag = kdb_putword(addr, contents, width);
1737 if (diag)
1738 return diag;
1739
1740 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1741
1742 return 0;
1743}
1744
1745/*
1746 * kdb_go - This function implements the 'go' command.
1747 * go [address-expression]
1748 */
1749static int kdb_go(int argc, const char **argv)
1750{
1751 unsigned long addr;
1752 int diag;
1753 int nextarg;
1754 long offset;
1755
1756 if (raw_smp_processor_id() != kdb_initial_cpu) {
1757 kdb_printf("go must execute on the entry cpu, "
1758 "please use \"cpu %d\" and then execute go\n",
1759 kdb_initial_cpu);
1760 return KDB_BADCPUNUM;
1761 }
1762 if (argc == 1) {
1763 nextarg = 1;
1764 diag = kdbgetaddrarg(argc, argv, &nextarg,
1765 &addr, &offset, NULL);
1766 if (diag)
1767 return diag;
1768 } else if (argc) {
1769 return KDB_ARGCOUNT;
1770 }
1771
1772 diag = KDB_CMD_GO;
1773 if (KDB_FLAG(CATASTROPHIC)) {
1774 kdb_printf("Catastrophic error detected\n");
1775 kdb_printf("kdb_continue_catastrophic=%d, ",
1776 kdb_continue_catastrophic);
1777 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1778 kdb_printf("type go a second time if you really want "
1779 "to continue\n");
1780 return 0;
1781 }
1782 if (kdb_continue_catastrophic == 2) {
1783 kdb_printf("forcing reboot\n");
1784 kdb_reboot(0, NULL);
1785 }
1786 kdb_printf("attempting to continue\n");
1787 }
1788 return diag;
1789}
1790
1791/*
1792 * kdb_rd - This function implements the 'rd' command.
1793 */
1794static int kdb_rd(int argc, const char **argv)
1795{
1796 int len = kdb_check_regs();
1797#if DBG_MAX_REG_NUM > 0
1798 int i;
1799 char *rname;
1800 int rsize;
1801 u64 reg64;
1802 u32 reg32;
1803 u16 reg16;
1804 u8 reg8;
1805
1806 if (len)
1807 return len;
1808
1809 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1810 rsize = dbg_reg_def[i].size * 2;
1811 if (rsize > 16)
1812 rsize = 2;
1813 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1814 len = 0;
1815 kdb_printf("\n");
1816 }
1817 if (len)
1818 len += kdb_printf(" ");
1819 switch(dbg_reg_def[i].size * 8) {
1820 case 8:
1821 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1822 if (!rname)
1823 break;
1824 len += kdb_printf("%s: %02x", rname, reg8);
1825 break;
1826 case 16:
1827 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1828 if (!rname)
1829 break;
1830 len += kdb_printf("%s: %04x", rname, reg16);
1831 break;
1832 case 32:
1833 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1834 if (!rname)
1835 break;
1836 len += kdb_printf("%s: %08x", rname, reg32);
1837 break;
1838 case 64:
1839 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1840 if (!rname)
1841 break;
1842 len += kdb_printf("%s: %016llx", rname, reg64);
1843 break;
1844 default:
1845 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1846 }
1847 }
1848 kdb_printf("\n");
1849#else
1850 if (len)
1851 return len;
1852
1853 kdb_dumpregs(kdb_current_regs);
1854#endif
1855 return 0;
1856}
1857
1858/*
1859 * kdb_rm - This function implements the 'rm' (register modify) command.
1860 * rm register-name new-contents
1861 * Remarks:
1862 * Allows register modification with the same restrictions as gdb
1863 */
1864static int kdb_rm(int argc, const char **argv)
1865{
1866#if DBG_MAX_REG_NUM > 0
1867 int diag;
1868 const char *rname;
1869 int i;
1870 u64 reg64;
1871 u32 reg32;
1872 u16 reg16;
1873 u8 reg8;
1874
1875 if (argc != 2)
1876 return KDB_ARGCOUNT;
1877 /*
1878 * Allow presence or absence of leading '%' symbol.
1879 */
1880 rname = argv[1];
1881 if (*rname == '%')
1882 rname++;
1883
1884 diag = kdbgetu64arg(argv[2], ®64);
1885 if (diag)
1886 return diag;
1887
1888 diag = kdb_check_regs();
1889 if (diag)
1890 return diag;
1891
1892 diag = KDB_BADREG;
1893 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1894 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1895 diag = 0;
1896 break;
1897 }
1898 }
1899 if (!diag) {
1900 switch(dbg_reg_def[i].size * 8) {
1901 case 8:
1902 reg8 = reg64;
1903 dbg_set_reg(i, ®8, kdb_current_regs);
1904 break;
1905 case 16:
1906 reg16 = reg64;
1907 dbg_set_reg(i, ®16, kdb_current_regs);
1908 break;
1909 case 32:
1910 reg32 = reg64;
1911 dbg_set_reg(i, ®32, kdb_current_regs);
1912 break;
1913 case 64:
1914 dbg_set_reg(i, ®64, kdb_current_regs);
1915 break;
1916 }
1917 }
1918 return diag;
1919#else
1920 kdb_printf("ERROR: Register set currently not implemented\n");
1921 return 0;
1922#endif
1923}
1924
1925#if defined(CONFIG_MAGIC_SYSRQ)
1926/*
1927 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1928 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1929 * sr <magic-sysrq-code>
1930 */
1931static int kdb_sr(int argc, const char **argv)
1932{
1933 if (argc != 1)
1934 return KDB_ARGCOUNT;
1935 kdb_trap_printk++;
1936 __handle_sysrq(*argv[1], false);
1937 kdb_trap_printk--;
1938
1939 return 0;
1940}
1941#endif /* CONFIG_MAGIC_SYSRQ */
1942
1943/*
1944 * kdb_ef - This function implements the 'regs' (display exception
1945 * frame) command. This command takes an address and expects to
1946 * find an exception frame at that address, formats and prints
1947 * it.
1948 * regs address-expression
1949 * Remarks:
1950 * Not done yet.
1951 */
1952static int kdb_ef(int argc, const char **argv)
1953{
1954 int diag;
1955 unsigned long addr;
1956 long offset;
1957 int nextarg;
1958
1959 if (argc != 1)
1960 return KDB_ARGCOUNT;
1961
1962 nextarg = 1;
1963 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1964 if (diag)
1965 return diag;
1966 show_regs((struct pt_regs *)addr);
1967 return 0;
1968}
1969
1970#if defined(CONFIG_MODULES)
1971/*
1972 * kdb_lsmod - This function implements the 'lsmod' command. Lists
1973 * currently loaded kernel modules.
1974 * Mostly taken from userland lsmod.
1975 */
1976static int kdb_lsmod(int argc, const char **argv)
1977{
1978 struct module *mod;
1979
1980 if (argc != 0)
1981 return KDB_ARGCOUNT;
1982
1983 kdb_printf("Module Size modstruct Used by\n");
1984 list_for_each_entry(mod, kdb_modules, list) {
1985
1986 kdb_printf("%-20s%8u 0x%p ", mod->name,
1987 mod->core_size, (void *)mod);
1988#ifdef CONFIG_MODULE_UNLOAD
1989 kdb_printf("%4ld ", module_refcount(mod));
1990#endif
1991 if (mod->state == MODULE_STATE_GOING)
1992 kdb_printf(" (Unloading)");
1993 else if (mod->state == MODULE_STATE_COMING)
1994 kdb_printf(" (Loading)");
1995 else
1996 kdb_printf(" (Live)");
1997 kdb_printf(" 0x%p", mod->module_core);
1998
1999#ifdef CONFIG_MODULE_UNLOAD
2000 {
2001 struct module_use *use;
2002 kdb_printf(" [ ");
2003 list_for_each_entry(use, &mod->source_list,
2004 source_list)
2005 kdb_printf("%s ", use->target->name);
2006 kdb_printf("]\n");
2007 }
2008#endif
2009 }
2010
2011 return 0;
2012}
2013
2014#endif /* CONFIG_MODULES */
2015
2016/*
2017 * kdb_env - This function implements the 'env' command. Display the
2018 * current environment variables.
2019 */
2020
2021static int kdb_env(int argc, const char **argv)
2022{
2023 int i;
2024
2025 for (i = 0; i < __nenv; i++) {
2026 if (__env[i])
2027 kdb_printf("%s\n", __env[i]);
2028 }
2029
2030 if (KDB_DEBUG(MASK))
2031 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2032
2033 return 0;
2034}
2035
2036#ifdef CONFIG_PRINTK
2037/*
2038 * kdb_dmesg - This function implements the 'dmesg' command to display
2039 * the contents of the syslog buffer.
2040 * dmesg [lines] [adjust]
2041 */
2042static int kdb_dmesg(int argc, const char **argv)
2043{
2044 int diag;
2045 int logging;
2046 int lines = 0;
2047 int adjust = 0;
2048 int n = 0;
2049 int skip = 0;
2050 struct kmsg_dumper dumper = { .active = 1 };
2051 size_t len;
2052 char buf[201];
2053
2054 if (argc > 2)
2055 return KDB_ARGCOUNT;
2056 if (argc) {
2057 char *cp;
2058 lines = simple_strtol(argv[1], &cp, 0);
2059 if (*cp)
2060 lines = 0;
2061 if (argc > 1) {
2062 adjust = simple_strtoul(argv[2], &cp, 0);
2063 if (*cp || adjust < 0)
2064 adjust = 0;
2065 }
2066 }
2067
2068 /* disable LOGGING if set */
2069 diag = kdbgetintenv("LOGGING", &logging);
2070 if (!diag && logging) {
2071 const char *setargs[] = { "set", "LOGGING", "0" };
2072 kdb_set(2, setargs);
2073 }
2074
2075 kmsg_dump_rewind_nolock(&dumper);
2076 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2077 n++;
2078
2079 if (lines < 0) {
2080 if (adjust >= n)
2081 kdb_printf("buffer only contains %d lines, nothing "
2082 "printed\n", n);
2083 else if (adjust - lines >= n)
2084 kdb_printf("buffer only contains %d lines, last %d "
2085 "lines printed\n", n, n - adjust);
2086 skip = adjust;
2087 lines = abs(lines);
2088 } else if (lines > 0) {
2089 skip = n - lines - adjust;
2090 lines = abs(lines);
2091 if (adjust >= n) {
2092 kdb_printf("buffer only contains %d lines, "
2093 "nothing printed\n", n);
2094 skip = n;
2095 } else if (skip < 0) {
2096 lines += skip;
2097 skip = 0;
2098 kdb_printf("buffer only contains %d lines, first "
2099 "%d lines printed\n", n, lines);
2100 }
2101 } else {
2102 lines = n;
2103 }
2104
2105 if (skip >= n || skip < 0)
2106 return 0;
2107
2108 kmsg_dump_rewind_nolock(&dumper);
2109 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2110 if (skip) {
2111 skip--;
2112 continue;
2113 }
2114 if (!lines--)
2115 break;
2116
2117 kdb_printf("%.*s\n", (int)len - 1, buf);
2118 }
2119
2120 return 0;
2121}
2122#endif /* CONFIG_PRINTK */
2123/*
2124 * kdb_cpu - This function implements the 'cpu' command.
2125 * cpu [<cpunum>]
2126 * Returns:
2127 * KDB_CMD_CPU for success, a kdb diagnostic if error
2128 */
2129static void kdb_cpu_status(void)
2130{
2131 int i, start_cpu, first_print = 1;
2132 char state, prev_state = '?';
2133
2134 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2135 kdb_printf("Available cpus: ");
2136 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2137 if (!cpu_online(i)) {
2138 state = 'F'; /* cpu is offline */
2139 } else {
2140 state = ' '; /* cpu is responding to kdb */
2141 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2142 state = 'I'; /* idle task */
2143 }
2144 if (state != prev_state) {
2145 if (prev_state != '?') {
2146 if (!first_print)
2147 kdb_printf(", ");
2148 first_print = 0;
2149 kdb_printf("%d", start_cpu);
2150 if (start_cpu < i-1)
2151 kdb_printf("-%d", i-1);
2152 if (prev_state != ' ')
2153 kdb_printf("(%c)", prev_state);
2154 }
2155 prev_state = state;
2156 start_cpu = i;
2157 }
2158 }
2159 /* print the trailing cpus, ignoring them if they are all offline */
2160 if (prev_state != 'F') {
2161 if (!first_print)
2162 kdb_printf(", ");
2163 kdb_printf("%d", start_cpu);
2164 if (start_cpu < i-1)
2165 kdb_printf("-%d", i-1);
2166 if (prev_state != ' ')
2167 kdb_printf("(%c)", prev_state);
2168 }
2169 kdb_printf("\n");
2170}
2171
2172static int kdb_cpu(int argc, const char **argv)
2173{
2174 unsigned long cpunum;
2175 int diag;
2176
2177 if (argc == 0) {
2178 kdb_cpu_status();
2179 return 0;
2180 }
2181
2182 if (argc != 1)
2183 return KDB_ARGCOUNT;
2184
2185 diag = kdbgetularg(argv[1], &cpunum);
2186 if (diag)
2187 return diag;
2188
2189 /*
2190 * Validate cpunum
2191 */
2192 if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
2193 return KDB_BADCPUNUM;
2194
2195 dbg_switch_cpu = cpunum;
2196
2197 /*
2198 * Switch to other cpu
2199 */
2200 return KDB_CMD_CPU;
2201}
2202
2203/* The user may not realize that ps/bta with no parameters does not print idle
2204 * or sleeping system daemon processes, so tell them how many were suppressed.
2205 */
2206void kdb_ps_suppressed(void)
2207{
2208 int idle = 0, daemon = 0;
2209 unsigned long mask_I = kdb_task_state_string("I"),
2210 mask_M = kdb_task_state_string("M");
2211 unsigned long cpu;
2212 const struct task_struct *p, *g;
2213 for_each_online_cpu(cpu) {
2214 p = kdb_curr_task(cpu);
2215 if (kdb_task_state(p, mask_I))
2216 ++idle;
2217 }
2218 kdb_do_each_thread(g, p) {
2219 if (kdb_task_state(p, mask_M))
2220 ++daemon;
2221 } kdb_while_each_thread(g, p);
2222 if (idle || daemon) {
2223 if (idle)
2224 kdb_printf("%d idle process%s (state I)%s\n",
2225 idle, idle == 1 ? "" : "es",
2226 daemon ? " and " : "");
2227 if (daemon)
2228 kdb_printf("%d sleeping system daemon (state M) "
2229 "process%s", daemon,
2230 daemon == 1 ? "" : "es");
2231 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2232 }
2233}
2234
2235/*
2236 * kdb_ps - This function implements the 'ps' command which shows a
2237 * list of the active processes.
2238 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2239 */
2240void kdb_ps1(const struct task_struct *p)
2241{
2242 int cpu;
2243 unsigned long tmp;
2244
2245 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2246 return;
2247
2248 cpu = kdb_process_cpu(p);
2249 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2250 (void *)p, p->pid, p->parent->pid,
2251 kdb_task_has_cpu(p), kdb_process_cpu(p),
2252 kdb_task_state_char(p),
2253 (void *)(&p->thread),
2254 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2255 p->comm);
2256 if (kdb_task_has_cpu(p)) {
2257 if (!KDB_TSK(cpu)) {
2258 kdb_printf(" Error: no saved data for this cpu\n");
2259 } else {
2260 if (KDB_TSK(cpu) != p)
2261 kdb_printf(" Error: does not match running "
2262 "process table (0x%p)\n", KDB_TSK(cpu));
2263 }
2264 }
2265}
2266
2267static int kdb_ps(int argc, const char **argv)
2268{
2269 struct task_struct *g, *p;
2270 unsigned long mask, cpu;
2271
2272 if (argc == 0)
2273 kdb_ps_suppressed();
2274 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2275 (int)(2*sizeof(void *))+2, "Task Addr",
2276 (int)(2*sizeof(void *))+2, "Thread");
2277 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2278 /* Run the active tasks first */
2279 for_each_online_cpu(cpu) {
2280 if (KDB_FLAG(CMD_INTERRUPT))
2281 return 0;
2282 p = kdb_curr_task(cpu);
2283 if (kdb_task_state(p, mask))
2284 kdb_ps1(p);
2285 }
2286 kdb_printf("\n");
2287 /* Now the real tasks */
2288 kdb_do_each_thread(g, p) {
2289 if (KDB_FLAG(CMD_INTERRUPT))
2290 return 0;
2291 if (kdb_task_state(p, mask))
2292 kdb_ps1(p);
2293 } kdb_while_each_thread(g, p);
2294
2295 return 0;
2296}
2297
2298/*
2299 * kdb_pid - This function implements the 'pid' command which switches
2300 * the currently active process.
2301 * pid [<pid> | R]
2302 */
2303static int kdb_pid(int argc, const char **argv)
2304{
2305 struct task_struct *p;
2306 unsigned long val;
2307 int diag;
2308
2309 if (argc > 1)
2310 return KDB_ARGCOUNT;
2311
2312 if (argc) {
2313 if (strcmp(argv[1], "R") == 0) {
2314 p = KDB_TSK(kdb_initial_cpu);
2315 } else {
2316 diag = kdbgetularg(argv[1], &val);
2317 if (diag)
2318 return KDB_BADINT;
2319
2320 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2321 if (!p) {
2322 kdb_printf("No task with pid=%d\n", (pid_t)val);
2323 return 0;
2324 }
2325 }
2326 kdb_set_current_task(p);
2327 }
2328 kdb_printf("KDB current process is %s(pid=%d)\n",
2329 kdb_current_task->comm,
2330 kdb_current_task->pid);
2331
2332 return 0;
2333}
2334
2335/*
2336 * kdb_ll - This function implements the 'll' command which follows a
2337 * linked list and executes an arbitrary command for each
2338 * element.
2339 */
2340static int kdb_ll(int argc, const char **argv)
2341{
2342 int diag = 0;
2343 unsigned long addr;
2344 long offset = 0;
2345 unsigned long va;
2346 unsigned long linkoffset;
2347 int nextarg;
2348 const char *command;
2349
2350 if (argc != 3)
2351 return KDB_ARGCOUNT;
2352
2353 nextarg = 1;
2354 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2355 if (diag)
2356 return diag;
2357
2358 diag = kdbgetularg(argv[2], &linkoffset);
2359 if (diag)
2360 return diag;
2361
2362 /*
2363 * Using the starting address as
2364 * the first element in the list, and assuming that
2365 * the list ends with a null pointer.
2366 */
2367
2368 va = addr;
2369 command = kdb_strdup(argv[3], GFP_KDB);
2370 if (!command) {
2371 kdb_printf("%s: cannot duplicate command\n", __func__);
2372 return 0;
2373 }
2374 /* Recursive use of kdb_parse, do not use argv after this point */
2375 argv = NULL;
2376
2377 while (va) {
2378 char buf[80];
2379
2380 if (KDB_FLAG(CMD_INTERRUPT))
2381 goto out;
2382
2383 sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va);
2384 diag = kdb_parse(buf);
2385 if (diag)
2386 goto out;
2387
2388 addr = va + linkoffset;
2389 if (kdb_getword(&va, addr, sizeof(va)))
2390 goto out;
2391 }
2392
2393out:
2394 kfree(command);
2395 return diag;
2396}
2397
2398static int kdb_kgdb(int argc, const char **argv)
2399{
2400 return KDB_CMD_KGDB;
2401}
2402
2403/*
2404 * kdb_help - This function implements the 'help' and '?' commands.
2405 */
2406static int kdb_help(int argc, const char **argv)
2407{
2408 kdbtab_t *kt;
2409 int i;
2410
2411 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2412 kdb_printf("-----------------------------"
2413 "-----------------------------\n");
2414 for_each_kdbcmd(kt, i) {
2415 if (kt->cmd_name)
2416 kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name,
2417 kt->cmd_usage, kt->cmd_help);
2418 if (KDB_FLAG(CMD_INTERRUPT))
2419 return 0;
2420 }
2421 return 0;
2422}
2423
2424/*
2425 * kdb_kill - This function implements the 'kill' commands.
2426 */
2427static int kdb_kill(int argc, const char **argv)
2428{
2429 long sig, pid;
2430 char *endp;
2431 struct task_struct *p;
2432 struct siginfo info;
2433
2434 if (argc != 2)
2435 return KDB_ARGCOUNT;
2436
2437 sig = simple_strtol(argv[1], &endp, 0);
2438 if (*endp)
2439 return KDB_BADINT;
2440 if (sig >= 0) {
2441 kdb_printf("Invalid signal parameter.<-signal>\n");
2442 return 0;
2443 }
2444 sig = -sig;
2445
2446 pid = simple_strtol(argv[2], &endp, 0);
2447 if (*endp)
2448 return KDB_BADINT;
2449 if (pid <= 0) {
2450 kdb_printf("Process ID must be large than 0.\n");
2451 return 0;
2452 }
2453
2454 /* Find the process. */
2455 p = find_task_by_pid_ns(pid, &init_pid_ns);
2456 if (!p) {
2457 kdb_printf("The specified process isn't found.\n");
2458 return 0;
2459 }
2460 p = p->group_leader;
2461 info.si_signo = sig;
2462 info.si_errno = 0;
2463 info.si_code = SI_USER;
2464 info.si_pid = pid; /* same capabilities as process being signalled */
2465 info.si_uid = 0; /* kdb has root authority */
2466 kdb_send_sig_info(p, &info);
2467 return 0;
2468}
2469
2470struct kdb_tm {
2471 int tm_sec; /* seconds */
2472 int tm_min; /* minutes */
2473 int tm_hour; /* hours */
2474 int tm_mday; /* day of the month */
2475 int tm_mon; /* month */
2476 int tm_year; /* year */
2477};
2478
2479static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2480{
2481 /* This will work from 1970-2099, 2100 is not a leap year */
2482 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2483 31, 30, 31, 30, 31 };
2484 memset(tm, 0, sizeof(*tm));
2485 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2486 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2487 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2488 tm->tm_min = tm->tm_sec / 60 % 60;
2489 tm->tm_hour = tm->tm_sec / 60 / 60;
2490 tm->tm_sec = tm->tm_sec % 60;
2491 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2492 tm->tm_mday %= (4*365+1);
2493 mon_day[1] = 29;
2494 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2495 tm->tm_mday -= mon_day[tm->tm_mon];
2496 if (++tm->tm_mon == 12) {
2497 tm->tm_mon = 0;
2498 ++tm->tm_year;
2499 mon_day[1] = 28;
2500 }
2501 }
2502 ++tm->tm_mday;
2503}
2504
2505/*
2506 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2507 * I cannot call that code directly from kdb, it has an unconditional
2508 * cli()/sti() and calls routines that take locks which can stop the debugger.
2509 */
2510static void kdb_sysinfo(struct sysinfo *val)
2511{
2512 struct timespec uptime;
2513 do_posix_clock_monotonic_gettime(&uptime);
2514 memset(val, 0, sizeof(*val));
2515 val->uptime = uptime.tv_sec;
2516 val->loads[0] = avenrun[0];
2517 val->loads[1] = avenrun[1];
2518 val->loads[2] = avenrun[2];
2519 val->procs = nr_threads-1;
2520 si_meminfo(val);
2521
2522 return;
2523}
2524
2525/*
2526 * kdb_summary - This function implements the 'summary' command.
2527 */
2528static int kdb_summary(int argc, const char **argv)
2529{
2530 struct timespec now;
2531 struct kdb_tm tm;
2532 struct sysinfo val;
2533
2534 if (argc)
2535 return KDB_ARGCOUNT;
2536
2537 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2538 kdb_printf("release %s\n", init_uts_ns.name.release);
2539 kdb_printf("version %s\n", init_uts_ns.name.version);
2540 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2541 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2542 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2543 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2544
2545 now = __current_kernel_time();
2546 kdb_gmtime(&now, &tm);
2547 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2548 "tz_minuteswest %d\n",
2549 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2550 tm.tm_hour, tm.tm_min, tm.tm_sec,
2551 sys_tz.tz_minuteswest);
2552
2553 kdb_sysinfo(&val);
2554 kdb_printf("uptime ");
2555 if (val.uptime > (24*60*60)) {
2556 int days = val.uptime / (24*60*60);
2557 val.uptime %= (24*60*60);
2558 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2559 }
2560 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2561
2562 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2563
2564#define LOAD_INT(x) ((x) >> FSHIFT)
2565#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2566 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2567 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2568 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2569 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2570#undef LOAD_INT
2571#undef LOAD_FRAC
2572 /* Display in kilobytes */
2573#define K(x) ((x) << (PAGE_SHIFT - 10))
2574 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2575 "Buffers: %8lu kB\n",
2576 val.totalram, val.freeram, val.bufferram);
2577 return 0;
2578}
2579
2580/*
2581 * kdb_per_cpu - This function implements the 'per_cpu' command.
2582 */
2583static int kdb_per_cpu(int argc, const char **argv)
2584{
2585 char fmtstr[64];
2586 int cpu, diag, nextarg = 1;
2587 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2588
2589 if (argc < 1 || argc > 3)
2590 return KDB_ARGCOUNT;
2591
2592 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2593 if (diag)
2594 return diag;
2595
2596 if (argc >= 2) {
2597 diag = kdbgetularg(argv[2], &bytesperword);
2598 if (diag)
2599 return diag;
2600 }
2601 if (!bytesperword)
2602 bytesperword = KDB_WORD_SIZE;
2603 else if (bytesperword > KDB_WORD_SIZE)
2604 return KDB_BADWIDTH;
2605 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2606 if (argc >= 3) {
2607 diag = kdbgetularg(argv[3], &whichcpu);
2608 if (diag)
2609 return diag;
2610 if (!cpu_online(whichcpu)) {
2611 kdb_printf("cpu %ld is not online\n", whichcpu);
2612 return KDB_BADCPUNUM;
2613 }
2614 }
2615
2616 /* Most architectures use __per_cpu_offset[cpu], some use
2617 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2618 */
2619#ifdef __per_cpu_offset
2620#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2621#else
2622#ifdef CONFIG_SMP
2623#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2624#else
2625#define KDB_PCU(cpu) 0
2626#endif
2627#endif
2628 for_each_online_cpu(cpu) {
2629 if (KDB_FLAG(CMD_INTERRUPT))
2630 return 0;
2631
2632 if (whichcpu != ~0UL && whichcpu != cpu)
2633 continue;
2634 addr = symaddr + KDB_PCU(cpu);
2635 diag = kdb_getword(&val, addr, bytesperword);
2636 if (diag) {
2637 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2638 "read, diag=%d\n", cpu, addr, diag);
2639 continue;
2640 }
2641 kdb_printf("%5d ", cpu);
2642 kdb_md_line(fmtstr, addr,
2643 bytesperword == KDB_WORD_SIZE,
2644 1, bytesperword, 1, 1, 0);
2645 }
2646#undef KDB_PCU
2647 return 0;
2648}
2649
2650/*
2651 * display help for the use of cmd | grep pattern
2652 */
2653static int kdb_grep_help(int argc, const char **argv)
2654{
2655 kdb_printf("Usage of cmd args | grep pattern:\n");
2656 kdb_printf(" Any command's output may be filtered through an ");
2657 kdb_printf("emulated 'pipe'.\n");
2658 kdb_printf(" 'grep' is just a key word.\n");
2659 kdb_printf(" The pattern may include a very limited set of "
2660 "metacharacters:\n");
2661 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2662 kdb_printf(" And if there are spaces in the pattern, you may "
2663 "quote it:\n");
2664 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2665 " or \"^pat tern$\"\n");
2666 return 0;
2667}
2668
2669/*
2670 * kdb_register_repeat - This function is used to register a kernel
2671 * debugger command.
2672 * Inputs:
2673 * cmd Command name
2674 * func Function to execute the command
2675 * usage A simple usage string showing arguments
2676 * help A simple help string describing command
2677 * repeat Does the command auto repeat on enter?
2678 * Returns:
2679 * zero for success, one if a duplicate command.
2680 */
2681#define kdb_command_extend 50 /* arbitrary */
2682int kdb_register_repeat(char *cmd,
2683 kdb_func_t func,
2684 char *usage,
2685 char *help,
2686 short minlen,
2687 kdb_repeat_t repeat)
2688{
2689 int i;
2690 kdbtab_t *kp;
2691
2692 /*
2693 * Brute force method to determine duplicates
2694 */
2695 for_each_kdbcmd(kp, i) {
2696 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2697 kdb_printf("Duplicate kdb command registered: "
2698 "%s, func %p help %s\n", cmd, func, help);
2699 return 1;
2700 }
2701 }
2702
2703 /*
2704 * Insert command into first available location in table
2705 */
2706 for_each_kdbcmd(kp, i) {
2707 if (kp->cmd_name == NULL)
2708 break;
2709 }
2710
2711 if (i >= kdb_max_commands) {
2712 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2713 kdb_command_extend) * sizeof(*new), GFP_KDB);
2714 if (!new) {
2715 kdb_printf("Could not allocate new kdb_command "
2716 "table\n");
2717 return 1;
2718 }
2719 if (kdb_commands) {
2720 memcpy(new, kdb_commands,
2721 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2722 kfree(kdb_commands);
2723 }
2724 memset(new + kdb_max_commands, 0,
2725 kdb_command_extend * sizeof(*new));
2726 kdb_commands = new;
2727 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2728 kdb_max_commands += kdb_command_extend;
2729 }
2730
2731 kp->cmd_name = cmd;
2732 kp->cmd_func = func;
2733 kp->cmd_usage = usage;
2734 kp->cmd_help = help;
2735 kp->cmd_flags = 0;
2736 kp->cmd_minlen = minlen;
2737 kp->cmd_repeat = repeat;
2738
2739 return 0;
2740}
2741EXPORT_SYMBOL_GPL(kdb_register_repeat);
2742
2743
2744/*
2745 * kdb_register - Compatibility register function for commands that do
2746 * not need to specify a repeat state. Equivalent to
2747 * kdb_register_repeat with KDB_REPEAT_NONE.
2748 * Inputs:
2749 * cmd Command name
2750 * func Function to execute the command
2751 * usage A simple usage string showing arguments
2752 * help A simple help string describing command
2753 * Returns:
2754 * zero for success, one if a duplicate command.
2755 */
2756int kdb_register(char *cmd,
2757 kdb_func_t func,
2758 char *usage,
2759 char *help,
2760 short minlen)
2761{
2762 return kdb_register_repeat(cmd, func, usage, help, minlen,
2763 KDB_REPEAT_NONE);
2764}
2765EXPORT_SYMBOL_GPL(kdb_register);
2766
2767/*
2768 * kdb_unregister - This function is used to unregister a kernel
2769 * debugger command. It is generally called when a module which
2770 * implements kdb commands is unloaded.
2771 * Inputs:
2772 * cmd Command name
2773 * Returns:
2774 * zero for success, one command not registered.
2775 */
2776int kdb_unregister(char *cmd)
2777{
2778 int i;
2779 kdbtab_t *kp;
2780
2781 /*
2782 * find the command.
2783 */
2784 for_each_kdbcmd(kp, i) {
2785 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2786 kp->cmd_name = NULL;
2787 return 0;
2788 }
2789 }
2790
2791 /* Couldn't find it. */
2792 return 1;
2793}
2794EXPORT_SYMBOL_GPL(kdb_unregister);
2795
2796/* Initialize the kdb command table. */
2797static void __init kdb_inittab(void)
2798{
2799 int i;
2800 kdbtab_t *kp;
2801
2802 for_each_kdbcmd(kp, i)
2803 kp->cmd_name = NULL;
2804
2805 kdb_register_repeat("md", kdb_md, "<vaddr>",
2806 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2807 KDB_REPEAT_NO_ARGS);
2808 kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
2809 "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
2810 kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
2811 "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
2812 kdb_register_repeat("mds", kdb_md, "<vaddr>",
2813 "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
2814 kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
2815 "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
2816 kdb_register_repeat("go", kdb_go, "[<vaddr>]",
2817 "Continue Execution", 1, KDB_REPEAT_NONE);
2818 kdb_register_repeat("rd", kdb_rd, "",
2819 "Display Registers", 0, KDB_REPEAT_NONE);
2820 kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
2821 "Modify Registers", 0, KDB_REPEAT_NONE);
2822 kdb_register_repeat("ef", kdb_ef, "<vaddr>",
2823 "Display exception frame", 0, KDB_REPEAT_NONE);
2824 kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
2825 "Stack traceback", 1, KDB_REPEAT_NONE);
2826 kdb_register_repeat("btp", kdb_bt, "<pid>",
2827 "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
2828 kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]",
2829 "Display stack all processes", 0, KDB_REPEAT_NONE);
2830 kdb_register_repeat("btc", kdb_bt, "",
2831 "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
2832 kdb_register_repeat("btt", kdb_bt, "<vaddr>",
2833 "Backtrace process given its struct task address", 0,
2834 KDB_REPEAT_NONE);
2835 kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>",
2836 "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE);
2837 kdb_register_repeat("env", kdb_env, "",
2838 "Show environment variables", 0, KDB_REPEAT_NONE);
2839 kdb_register_repeat("set", kdb_set, "",
2840 "Set environment variables", 0, KDB_REPEAT_NONE);
2841 kdb_register_repeat("help", kdb_help, "",
2842 "Display Help Message", 1, KDB_REPEAT_NONE);
2843 kdb_register_repeat("?", kdb_help, "",
2844 "Display Help Message", 0, KDB_REPEAT_NONE);
2845 kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
2846 "Switch to new cpu", 0, KDB_REPEAT_NONE);
2847 kdb_register_repeat("kgdb", kdb_kgdb, "",
2848 "Enter kgdb mode", 0, KDB_REPEAT_NONE);
2849 kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
2850 "Display active task list", 0, KDB_REPEAT_NONE);
2851 kdb_register_repeat("pid", kdb_pid, "<pidnum>",
2852 "Switch to another task", 0, KDB_REPEAT_NONE);
2853 kdb_register_repeat("reboot", kdb_reboot, "",
2854 "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
2855#if defined(CONFIG_MODULES)
2856 kdb_register_repeat("lsmod", kdb_lsmod, "",
2857 "List loaded kernel modules", 0, KDB_REPEAT_NONE);
2858#endif
2859#if defined(CONFIG_MAGIC_SYSRQ)
2860 kdb_register_repeat("sr", kdb_sr, "<key>",
2861 "Magic SysRq key", 0, KDB_REPEAT_NONE);
2862#endif
2863#if defined(CONFIG_PRINTK)
2864 kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
2865 "Display syslog buffer", 0, KDB_REPEAT_NONE);
2866#endif
2867 kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2868 "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
2869 kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
2870 "Send a signal to a process", 0, KDB_REPEAT_NONE);
2871 kdb_register_repeat("summary", kdb_summary, "",
2872 "Summarize the system", 4, KDB_REPEAT_NONE);
2873 kdb_register_repeat("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2874 "Display per_cpu variables", 3, KDB_REPEAT_NONE);
2875 kdb_register_repeat("grephelp", kdb_grep_help, "",
2876 "Display help on | grep", 0, KDB_REPEAT_NONE);
2877}
2878
2879/* Execute any commands defined in kdb_cmds. */
2880static void __init kdb_cmd_init(void)
2881{
2882 int i, diag;
2883 for (i = 0; kdb_cmds[i]; ++i) {
2884 diag = kdb_parse(kdb_cmds[i]);
2885 if (diag)
2886 kdb_printf("kdb command %s failed, kdb diag %d\n",
2887 kdb_cmds[i], diag);
2888 }
2889 if (defcmd_in_progress) {
2890 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2891 kdb_parse("endefcmd");
2892 }
2893}
2894
2895/* Initialize kdb_printf, breakpoint tables and kdb state */
2896void __init kdb_init(int lvl)
2897{
2898 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2899 int i;
2900
2901 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2902 return;
2903 for (i = kdb_init_lvl; i < lvl; i++) {
2904 switch (i) {
2905 case KDB_NOT_INITIALIZED:
2906 kdb_inittab(); /* Initialize Command Table */
2907 kdb_initbptab(); /* Initialize Breakpoints */
2908 break;
2909 case KDB_INIT_EARLY:
2910 kdb_cmd_init(); /* Build kdb_cmds tables */
2911 break;
2912 }
2913 }
2914 kdb_init_lvl = lvl;
2915}