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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/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sysrq.h>
22#include <linux/smp.h>
23#include <linux/utsname.h>
24#include <linux/vmalloc.h>
25#include <linux/atomic.h>
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/mm.h>
29#include <linux/init.h>
30#include <linux/kallsyms.h>
31#include <linux/kgdb.h>
32#include <linux/kdb.h>
33#include <linux/notifier.h>
34#include <linux/interrupt.h>
35#include <linux/delay.h>
36#include <linux/nmi.h>
37#include <linux/time.h>
38#include <linux/ptrace.h>
39#include <linux/sysctl.h>
40#include <linux/cpu.h>
41#include <linux/kdebug.h>
42#include <linux/proc_fs.h>
43#include <linux/uaccess.h>
44#include <linux/slab.h>
45#include "kdb_private.h"
46
47#undef MODULE_PARAM_PREFIX
48#define MODULE_PARAM_PREFIX "kdb."
49
50static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
51module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
52
53char kdb_grep_string[KDB_GREP_STRLEN];
54int kdb_grepping_flag;
55EXPORT_SYMBOL(kdb_grepping_flag);
56int kdb_grep_leading;
57int kdb_grep_trailing;
58
59/*
60 * Kernel debugger state flags
61 */
62int kdb_flags;
63atomic_t kdb_event;
64
65/*
66 * kdb_lock protects updates to kdb_initial_cpu. Used to
67 * single thread processors through the kernel debugger.
68 */
69int kdb_initial_cpu = -1; /* cpu number that owns kdb */
70int kdb_nextline = 1;
71int kdb_state; /* General KDB state */
72
73struct task_struct *kdb_current_task;
74EXPORT_SYMBOL(kdb_current_task);
75struct pt_regs *kdb_current_regs;
76
77const char *kdb_diemsg;
78static int kdb_go_count;
79#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
80static unsigned int kdb_continue_catastrophic =
81 CONFIG_KDB_CONTINUE_CATASTROPHIC;
82#else
83static unsigned int kdb_continue_catastrophic;
84#endif
85
86/* kdb_commands describes the available commands. */
87static kdbtab_t *kdb_commands;
88#define KDB_BASE_CMD_MAX 50
89static int kdb_max_commands = KDB_BASE_CMD_MAX;
90static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
91#define for_each_kdbcmd(cmd, num) \
92 for ((cmd) = kdb_base_commands, (num) = 0; \
93 num < kdb_max_commands; \
94 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
95
96typedef struct _kdbmsg {
97 int km_diag; /* kdb diagnostic */
98 char *km_msg; /* Corresponding message text */
99} kdbmsg_t;
100
101#define KDBMSG(msgnum, text) \
102 { KDB_##msgnum, text }
103
104static kdbmsg_t kdbmsgs[] = {
105 KDBMSG(NOTFOUND, "Command Not Found"),
106 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
107 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
108 "8 is only allowed on 64 bit systems"),
109 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
110 KDBMSG(NOTENV, "Cannot find environment variable"),
111 KDBMSG(NOENVVALUE, "Environment variable should have value"),
112 KDBMSG(NOTIMP, "Command not implemented"),
113 KDBMSG(ENVFULL, "Environment full"),
114 KDBMSG(ENVBUFFULL, "Environment buffer full"),
115 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
116#ifdef CONFIG_CPU_XSCALE
117 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
118#else
119 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
120#endif
121 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
122 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
123 KDBMSG(BADMODE, "Invalid IDMODE"),
124 KDBMSG(BADINT, "Illegal numeric value"),
125 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
126 KDBMSG(BADREG, "Invalid register name"),
127 KDBMSG(BADCPUNUM, "Invalid cpu number"),
128 KDBMSG(BADLENGTH, "Invalid length field"),
129 KDBMSG(NOBP, "No Breakpoint exists"),
130 KDBMSG(BADADDR, "Invalid address"),
131 KDBMSG(NOPERM, "Permission denied"),
132};
133#undef KDBMSG
134
135static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
136
137
138/*
139 * Initial environment. This is all kept static and local to
140 * this file. We don't want to rely on the memory allocation
141 * mechanisms in the kernel, so we use a very limited allocate-only
142 * heap for new and altered environment variables. The entire
143 * environment is limited to a fixed number of entries (add more
144 * to __env[] if required) and a fixed amount of heap (add more to
145 * KDB_ENVBUFSIZE if required).
146 */
147
148static char *__env[] = {
149#if defined(CONFIG_SMP)
150 "PROMPT=[%d]kdb> ",
151#else
152 "PROMPT=kdb> ",
153#endif
154 "MOREPROMPT=more> ",
155 "RADIX=16",
156 "MDCOUNT=8", /* lines of md output */
157 KDB_PLATFORM_ENV,
158 "DTABCOUNT=30",
159 "NOSECT=1",
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 (char *)0,
177 (char *)0,
178 (char *)0,
179 (char *)0,
180 (char *)0,
181 (char *)0,
182 (char *)0,
183 (char *)0,
184};
185
186static const int __nenv = ARRAY_SIZE(__env);
187
188struct task_struct *kdb_curr_task(int cpu)
189{
190 struct task_struct *p = curr_task(cpu);
191#ifdef _TIF_MCA_INIT
192 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
193 p = krp->p;
194#endif
195 return p;
196}
197
198/*
199 * Check whether the flags of the current command and the permissions
200 * of the kdb console has allow a command to be run.
201 */
202static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
203 bool no_args)
204{
205 /* permissions comes from userspace so needs massaging slightly */
206 permissions &= KDB_ENABLE_MASK;
207 permissions |= KDB_ENABLE_ALWAYS_SAFE;
208
209 /* some commands change group when launched with no arguments */
210 if (no_args)
211 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
212
213 flags |= KDB_ENABLE_ALL;
214
215 return permissions & flags;
216}
217
218/*
219 * kdbgetenv - This function will return the character string value of
220 * an environment variable.
221 * Parameters:
222 * match A character string representing an environment variable.
223 * Returns:
224 * NULL No environment variable matches 'match'
225 * char* Pointer to string value of environment variable.
226 */
227char *kdbgetenv(const char *match)
228{
229 char **ep = __env;
230 int matchlen = strlen(match);
231 int i;
232
233 for (i = 0; i < __nenv; i++) {
234 char *e = *ep++;
235
236 if (!e)
237 continue;
238
239 if ((strncmp(match, e, matchlen) == 0)
240 && ((e[matchlen] == '\0')
241 || (e[matchlen] == '='))) {
242 char *cp = strchr(e, '=');
243 return cp ? ++cp : "";
244 }
245 }
246 return NULL;
247}
248
249/*
250 * kdballocenv - This function is used to allocate bytes for
251 * environment entries.
252 * Parameters:
253 * match A character string representing a numeric value
254 * Outputs:
255 * *value the unsigned long representation of the env variable 'match'
256 * Returns:
257 * Zero on success, a kdb diagnostic on failure.
258 * Remarks:
259 * We use a static environment buffer (envbuffer) to hold the values
260 * of dynamically generated environment variables (see kdb_set). Buffer
261 * space once allocated is never free'd, so over time, the amount of space
262 * (currently 512 bytes) will be exhausted if env variables are changed
263 * frequently.
264 */
265static char *kdballocenv(size_t bytes)
266{
267#define KDB_ENVBUFSIZE 512
268 static char envbuffer[KDB_ENVBUFSIZE];
269 static int envbufsize;
270 char *ep = NULL;
271
272 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
273 ep = &envbuffer[envbufsize];
274 envbufsize += bytes;
275 }
276 return ep;
277}
278
279/*
280 * kdbgetulenv - This function will return the value of an unsigned
281 * long-valued environment variable.
282 * Parameters:
283 * match A character string representing a numeric value
284 * Outputs:
285 * *value the unsigned long represntation of the env variable 'match'
286 * Returns:
287 * Zero on success, a kdb diagnostic on failure.
288 */
289static int kdbgetulenv(const char *match, unsigned long *value)
290{
291 char *ep;
292
293 ep = kdbgetenv(match);
294 if (!ep)
295 return KDB_NOTENV;
296 if (strlen(ep) == 0)
297 return KDB_NOENVVALUE;
298
299 *value = simple_strtoul(ep, NULL, 0);
300
301 return 0;
302}
303
304/*
305 * kdbgetintenv - This function will return the value of an
306 * integer-valued environment variable.
307 * Parameters:
308 * match A character string representing an integer-valued env variable
309 * Outputs:
310 * *value the integer representation of the environment variable 'match'
311 * Returns:
312 * Zero on success, a kdb diagnostic on failure.
313 */
314int kdbgetintenv(const char *match, int *value)
315{
316 unsigned long val;
317 int diag;
318
319 diag = kdbgetulenv(match, &val);
320 if (!diag)
321 *value = (int) val;
322 return diag;
323}
324
325/*
326 * kdbgetularg - This function will convert a numeric string into an
327 * unsigned long value.
328 * Parameters:
329 * arg A character string representing a numeric value
330 * Outputs:
331 * *value the unsigned long represntation of arg.
332 * Returns:
333 * Zero on success, a kdb diagnostic on failure.
334 */
335int kdbgetularg(const char *arg, unsigned long *value)
336{
337 char *endp;
338 unsigned long val;
339
340 val = simple_strtoul(arg, &endp, 0);
341
342 if (endp == arg) {
343 /*
344 * Also try base 16, for us folks too lazy to type the
345 * leading 0x...
346 */
347 val = simple_strtoul(arg, &endp, 16);
348 if (endp == arg)
349 return KDB_BADINT;
350 }
351
352 *value = val;
353
354 return 0;
355}
356
357int kdbgetu64arg(const char *arg, u64 *value)
358{
359 char *endp;
360 u64 val;
361
362 val = simple_strtoull(arg, &endp, 0);
363
364 if (endp == arg) {
365
366 val = simple_strtoull(arg, &endp, 16);
367 if (endp == arg)
368 return KDB_BADINT;
369 }
370
371 *value = val;
372
373 return 0;
374}
375
376/*
377 * kdb_set - This function implements the 'set' command. Alter an
378 * existing environment variable or create a new one.
379 */
380int kdb_set(int argc, const char **argv)
381{
382 int i;
383 char *ep;
384 size_t varlen, vallen;
385
386 /*
387 * we can be invoked two ways:
388 * set var=value argv[1]="var", argv[2]="value"
389 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
390 * - if the latter, shift 'em down.
391 */
392 if (argc == 3) {
393 argv[2] = argv[3];
394 argc--;
395 }
396
397 if (argc != 2)
398 return KDB_ARGCOUNT;
399
400 /*
401 * Check for internal variables
402 */
403 if (strcmp(argv[1], "KDBDEBUG") == 0) {
404 unsigned int debugflags;
405 char *cp;
406
407 debugflags = simple_strtoul(argv[2], &cp, 0);
408 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
409 kdb_printf("kdb: illegal debug flags '%s'\n",
410 argv[2]);
411 return 0;
412 }
413 kdb_flags = (kdb_flags &
414 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
415 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
416
417 return 0;
418 }
419
420 /*
421 * Tokenizer squashed the '=' sign. argv[1] is variable
422 * name, argv[2] = value.
423 */
424 varlen = strlen(argv[1]);
425 vallen = strlen(argv[2]);
426 ep = kdballocenv(varlen + vallen + 2);
427 if (ep == (char *)0)
428 return KDB_ENVBUFFULL;
429
430 sprintf(ep, "%s=%s", argv[1], argv[2]);
431
432 ep[varlen+vallen+1] = '\0';
433
434 for (i = 0; i < __nenv; i++) {
435 if (__env[i]
436 && ((strncmp(__env[i], argv[1], varlen) == 0)
437 && ((__env[i][varlen] == '\0')
438 || (__env[i][varlen] == '=')))) {
439 __env[i] = ep;
440 return 0;
441 }
442 }
443
444 /*
445 * Wasn't existing variable. Fit into slot.
446 */
447 for (i = 0; i < __nenv-1; i++) {
448 if (__env[i] == (char *)0) {
449 __env[i] = ep;
450 return 0;
451 }
452 }
453
454 return KDB_ENVFULL;
455}
456
457static int kdb_check_regs(void)
458{
459 if (!kdb_current_regs) {
460 kdb_printf("No current kdb registers."
461 " You may need to select another task\n");
462 return KDB_BADREG;
463 }
464 return 0;
465}
466
467/*
468 * kdbgetaddrarg - This function is responsible for parsing an
469 * address-expression and returning the value of the expression,
470 * symbol name, and offset to the caller.
471 *
472 * The argument may consist of a numeric value (decimal or
473 * hexidecimal), a symbol name, a register name (preceded by the
474 * percent sign), an environment variable with a numeric value
475 * (preceded by a dollar sign) or a simple arithmetic expression
476 * consisting of a symbol name, +/-, and a numeric constant value
477 * (offset).
478 * Parameters:
479 * argc - count of arguments in argv
480 * argv - argument vector
481 * *nextarg - index to next unparsed argument in argv[]
482 * regs - Register state at time of KDB entry
483 * Outputs:
484 * *value - receives the value of the address-expression
485 * *offset - receives the offset specified, if any
486 * *name - receives the symbol name, if any
487 * *nextarg - index to next unparsed argument in argv[]
488 * Returns:
489 * zero is returned on success, a kdb diagnostic code is
490 * returned on error.
491 */
492int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
493 unsigned long *value, long *offset,
494 char **name)
495{
496 unsigned long addr;
497 unsigned long off = 0;
498 int positive;
499 int diag;
500 int found = 0;
501 char *symname;
502 char symbol = '\0';
503 char *cp;
504 kdb_symtab_t symtab;
505
506 /*
507 * If the enable flags prohibit both arbitrary memory access
508 * and flow control then there are no reasonable grounds to
509 * provide symbol lookup.
510 */
511 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
512 kdb_cmd_enabled, false))
513 return KDB_NOPERM;
514
515 /*
516 * Process arguments which follow the following syntax:
517 *
518 * symbol | numeric-address [+/- numeric-offset]
519 * %register
520 * $environment-variable
521 */
522
523 if (*nextarg > argc)
524 return KDB_ARGCOUNT;
525
526 symname = (char *)argv[*nextarg];
527
528 /*
529 * If there is no whitespace between the symbol
530 * or address and the '+' or '-' symbols, we
531 * remember the character and replace it with a
532 * null so the symbol/value can be properly parsed
533 */
534 cp = strpbrk(symname, "+-");
535 if (cp != NULL) {
536 symbol = *cp;
537 *cp++ = '\0';
538 }
539
540 if (symname[0] == '$') {
541 diag = kdbgetulenv(&symname[1], &addr);
542 if (diag)
543 return diag;
544 } else if (symname[0] == '%') {
545 diag = kdb_check_regs();
546 if (diag)
547 return diag;
548 /* Implement register values with % at a later time as it is
549 * arch optional.
550 */
551 return KDB_NOTIMP;
552 } else {
553 found = kdbgetsymval(symname, &symtab);
554 if (found) {
555 addr = symtab.sym_start;
556 } else {
557 diag = kdbgetularg(argv[*nextarg], &addr);
558 if (diag)
559 return diag;
560 }
561 }
562
563 if (!found)
564 found = kdbnearsym(addr, &symtab);
565
566 (*nextarg)++;
567
568 if (name)
569 *name = symname;
570 if (value)
571 *value = addr;
572 if (offset && name && *name)
573 *offset = addr - symtab.sym_start;
574
575 if ((*nextarg > argc)
576 && (symbol == '\0'))
577 return 0;
578
579 /*
580 * check for +/- and offset
581 */
582
583 if (symbol == '\0') {
584 if ((argv[*nextarg][0] != '+')
585 && (argv[*nextarg][0] != '-')) {
586 /*
587 * Not our argument. Return.
588 */
589 return 0;
590 } else {
591 positive = (argv[*nextarg][0] == '+');
592 (*nextarg)++;
593 }
594 } else
595 positive = (symbol == '+');
596
597 /*
598 * Now there must be an offset!
599 */
600 if ((*nextarg > argc)
601 && (symbol == '\0')) {
602 return KDB_INVADDRFMT;
603 }
604
605 if (!symbol) {
606 cp = (char *)argv[*nextarg];
607 (*nextarg)++;
608 }
609
610 diag = kdbgetularg(cp, &off);
611 if (diag)
612 return diag;
613
614 if (!positive)
615 off = -off;
616
617 if (offset)
618 *offset += off;
619
620 if (value)
621 *value += off;
622
623 return 0;
624}
625
626static void kdb_cmderror(int diag)
627{
628 int i;
629
630 if (diag >= 0) {
631 kdb_printf("no error detected (diagnostic is %d)\n", diag);
632 return;
633 }
634
635 for (i = 0; i < __nkdb_err; i++) {
636 if (kdbmsgs[i].km_diag == diag) {
637 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
638 return;
639 }
640 }
641
642 kdb_printf("Unknown diag %d\n", -diag);
643}
644
645/*
646 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
647 * command which defines one command as a set of other commands,
648 * terminated by endefcmd. kdb_defcmd processes the initial
649 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
650 * the following commands until 'endefcmd'.
651 * Inputs:
652 * argc argument count
653 * argv argument vector
654 * Returns:
655 * zero for success, a kdb diagnostic if error
656 */
657struct defcmd_set {
658 int count;
659 int usable;
660 char *name;
661 char *usage;
662 char *help;
663 char **command;
664};
665static struct defcmd_set *defcmd_set;
666static int defcmd_set_count;
667static int defcmd_in_progress;
668
669/* Forward references */
670static int kdb_exec_defcmd(int argc, const char **argv);
671
672static int kdb_defcmd2(const char *cmdstr, const char *argv0)
673{
674 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
675 char **save_command = s->command;
676 if (strcmp(argv0, "endefcmd") == 0) {
677 defcmd_in_progress = 0;
678 if (!s->count)
679 s->usable = 0;
680 if (s->usable)
681 /* macros are always safe because when executed each
682 * internal command re-enters kdb_parse() and is
683 * safety checked individually.
684 */
685 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
686 s->help, 0,
687 KDB_ENABLE_ALWAYS_SAFE);
688 return 0;
689 }
690 if (!s->usable)
691 return KDB_NOTIMP;
692 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
693 if (!s->command) {
694 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
695 cmdstr);
696 s->usable = 0;
697 return KDB_NOTIMP;
698 }
699 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
700 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
701 kfree(save_command);
702 return 0;
703}
704
705static int kdb_defcmd(int argc, const char **argv)
706{
707 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
708 if (defcmd_in_progress) {
709 kdb_printf("kdb: nested defcmd detected, assuming missing "
710 "endefcmd\n");
711 kdb_defcmd2("endefcmd", "endefcmd");
712 }
713 if (argc == 0) {
714 int i;
715 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
716 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
717 s->usage, s->help);
718 for (i = 0; i < s->count; ++i)
719 kdb_printf("%s", s->command[i]);
720 kdb_printf("endefcmd\n");
721 }
722 return 0;
723 }
724 if (argc != 3)
725 return KDB_ARGCOUNT;
726 if (in_dbg_master()) {
727 kdb_printf("Command only available during kdb_init()\n");
728 return KDB_NOTIMP;
729 }
730 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
731 GFP_KDB);
732 if (!defcmd_set)
733 goto fail_defcmd;
734 memcpy(defcmd_set, save_defcmd_set,
735 defcmd_set_count * sizeof(*defcmd_set));
736 s = defcmd_set + defcmd_set_count;
737 memset(s, 0, sizeof(*s));
738 s->usable = 1;
739 s->name = kdb_strdup(argv[1], GFP_KDB);
740 if (!s->name)
741 goto fail_name;
742 s->usage = kdb_strdup(argv[2], GFP_KDB);
743 if (!s->usage)
744 goto fail_usage;
745 s->help = kdb_strdup(argv[3], GFP_KDB);
746 if (!s->help)
747 goto fail_help;
748 if (s->usage[0] == '"') {
749 strcpy(s->usage, argv[2]+1);
750 s->usage[strlen(s->usage)-1] = '\0';
751 }
752 if (s->help[0] == '"') {
753 strcpy(s->help, argv[3]+1);
754 s->help[strlen(s->help)-1] = '\0';
755 }
756 ++defcmd_set_count;
757 defcmd_in_progress = 1;
758 kfree(save_defcmd_set);
759 return 0;
760fail_help:
761 kfree(s->usage);
762fail_usage:
763 kfree(s->name);
764fail_name:
765 kfree(defcmd_set);
766fail_defcmd:
767 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
768 defcmd_set = save_defcmd_set;
769 return KDB_NOTIMP;
770}
771
772/*
773 * kdb_exec_defcmd - Execute the set of commands associated with this
774 * defcmd name.
775 * Inputs:
776 * argc argument count
777 * argv argument vector
778 * Returns:
779 * zero for success, a kdb diagnostic if error
780 */
781static int kdb_exec_defcmd(int argc, const char **argv)
782{
783 int i, ret;
784 struct defcmd_set *s;
785 if (argc != 0)
786 return KDB_ARGCOUNT;
787 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
788 if (strcmp(s->name, argv[0]) == 0)
789 break;
790 }
791 if (i == defcmd_set_count) {
792 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
793 argv[0]);
794 return KDB_NOTIMP;
795 }
796 for (i = 0; i < s->count; ++i) {
797 /* Recursive use of kdb_parse, do not use argv after
798 * this point */
799 argv = NULL;
800 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
801 ret = kdb_parse(s->command[i]);
802 if (ret)
803 return ret;
804 }
805 return 0;
806}
807
808/* Command history */
809#define KDB_CMD_HISTORY_COUNT 32
810#define CMD_BUFLEN 200 /* kdb_printf: max printline
811 * size == 256 */
812static unsigned int cmd_head, cmd_tail;
813static unsigned int cmdptr;
814static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
815static char cmd_cur[CMD_BUFLEN];
816
817/*
818 * The "str" argument may point to something like | grep xyz
819 */
820static void parse_grep(const char *str)
821{
822 int len;
823 char *cp = (char *)str, *cp2;
824
825 /* sanity check: we should have been called with the \ first */
826 if (*cp != '|')
827 return;
828 cp++;
829 while (isspace(*cp))
830 cp++;
831 if (strncmp(cp, "grep ", 5)) {
832 kdb_printf("invalid 'pipe', see grephelp\n");
833 return;
834 }
835 cp += 5;
836 while (isspace(*cp))
837 cp++;
838 cp2 = strchr(cp, '\n');
839 if (cp2)
840 *cp2 = '\0'; /* remove the trailing newline */
841 len = strlen(cp);
842 if (len == 0) {
843 kdb_printf("invalid 'pipe', see grephelp\n");
844 return;
845 }
846 /* now cp points to a nonzero length search string */
847 if (*cp == '"') {
848 /* allow it be "x y z" by removing the "'s - there must
849 be two of them */
850 cp++;
851 cp2 = strchr(cp, '"');
852 if (!cp2) {
853 kdb_printf("invalid quoted string, see grephelp\n");
854 return;
855 }
856 *cp2 = '\0'; /* end the string where the 2nd " was */
857 }
858 kdb_grep_leading = 0;
859 if (*cp == '^') {
860 kdb_grep_leading = 1;
861 cp++;
862 }
863 len = strlen(cp);
864 kdb_grep_trailing = 0;
865 if (*(cp+len-1) == '$') {
866 kdb_grep_trailing = 1;
867 *(cp+len-1) = '\0';
868 }
869 len = strlen(cp);
870 if (!len)
871 return;
872 if (len >= KDB_GREP_STRLEN) {
873 kdb_printf("search string too long\n");
874 return;
875 }
876 strcpy(kdb_grep_string, cp);
877 kdb_grepping_flag++;
878 return;
879}
880
881/*
882 * kdb_parse - Parse the command line, search the command table for a
883 * matching command and invoke the command function. This
884 * function may be called recursively, if it is, the second call
885 * will overwrite argv and cbuf. It is the caller's
886 * responsibility to save their argv if they recursively call
887 * kdb_parse().
888 * Parameters:
889 * cmdstr The input command line to be parsed.
890 * regs The registers at the time kdb was entered.
891 * Returns:
892 * Zero for success, a kdb diagnostic if failure.
893 * Remarks:
894 * Limited to 20 tokens.
895 *
896 * Real rudimentary tokenization. Basically only whitespace
897 * is considered a token delimeter (but special consideration
898 * is taken of the '=' sign as used by the 'set' command).
899 *
900 * The algorithm used to tokenize the input string relies on
901 * there being at least one whitespace (or otherwise useless)
902 * character between tokens as the character immediately following
903 * the token is altered in-place to a null-byte to terminate the
904 * token string.
905 */
906
907#define MAXARGC 20
908
909int kdb_parse(const char *cmdstr)
910{
911 static char *argv[MAXARGC];
912 static int argc;
913 static char cbuf[CMD_BUFLEN+2];
914 char *cp;
915 char *cpp, quoted;
916 kdbtab_t *tp;
917 int i, escaped, ignore_errors = 0, check_grep = 0;
918
919 /*
920 * First tokenize the command string.
921 */
922 cp = (char *)cmdstr;
923
924 if (KDB_FLAG(CMD_INTERRUPT)) {
925 /* Previous command was interrupted, newline must not
926 * repeat the command */
927 KDB_FLAG_CLEAR(CMD_INTERRUPT);
928 KDB_STATE_SET(PAGER);
929 argc = 0; /* no repeat */
930 }
931
932 if (*cp != '\n' && *cp != '\0') {
933 argc = 0;
934 cpp = cbuf;
935 while (*cp) {
936 /* skip whitespace */
937 while (isspace(*cp))
938 cp++;
939 if ((*cp == '\0') || (*cp == '\n') ||
940 (*cp == '#' && !defcmd_in_progress))
941 break;
942 /* special case: check for | grep pattern */
943 if (*cp == '|') {
944 check_grep++;
945 break;
946 }
947 if (cpp >= cbuf + CMD_BUFLEN) {
948 kdb_printf("kdb_parse: command buffer "
949 "overflow, command ignored\n%s\n",
950 cmdstr);
951 return KDB_NOTFOUND;
952 }
953 if (argc >= MAXARGC - 1) {
954 kdb_printf("kdb_parse: too many arguments, "
955 "command ignored\n%s\n", cmdstr);
956 return KDB_NOTFOUND;
957 }
958 argv[argc++] = cpp;
959 escaped = 0;
960 quoted = '\0';
961 /* Copy to next unquoted and unescaped
962 * whitespace or '=' */
963 while (*cp && *cp != '\n' &&
964 (escaped || quoted || !isspace(*cp))) {
965 if (cpp >= cbuf + CMD_BUFLEN)
966 break;
967 if (escaped) {
968 escaped = 0;
969 *cpp++ = *cp++;
970 continue;
971 }
972 if (*cp == '\\') {
973 escaped = 1;
974 ++cp;
975 continue;
976 }
977 if (*cp == quoted)
978 quoted = '\0';
979 else if (*cp == '\'' || *cp == '"')
980 quoted = *cp;
981 *cpp = *cp++;
982 if (*cpp == '=' && !quoted)
983 break;
984 ++cpp;
985 }
986 *cpp++ = '\0'; /* Squash a ws or '=' character */
987 }
988 }
989 if (!argc)
990 return 0;
991 if (check_grep)
992 parse_grep(cp);
993 if (defcmd_in_progress) {
994 int result = kdb_defcmd2(cmdstr, argv[0]);
995 if (!defcmd_in_progress) {
996 argc = 0; /* avoid repeat on endefcmd */
997 *(argv[0]) = '\0';
998 }
999 return result;
1000 }
1001 if (argv[0][0] == '-' && argv[0][1] &&
1002 (argv[0][1] < '0' || argv[0][1] > '9')) {
1003 ignore_errors = 1;
1004 ++argv[0];
1005 }
1006
1007 for_each_kdbcmd(tp, i) {
1008 if (tp->cmd_name) {
1009 /*
1010 * If this command is allowed to be abbreviated,
1011 * check to see if this is it.
1012 */
1013
1014 if (tp->cmd_minlen
1015 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1016 if (strncmp(argv[0],
1017 tp->cmd_name,
1018 tp->cmd_minlen) == 0) {
1019 break;
1020 }
1021 }
1022
1023 if (strcmp(argv[0], tp->cmd_name) == 0)
1024 break;
1025 }
1026 }
1027
1028 /*
1029 * If we don't find a command by this name, see if the first
1030 * few characters of this match any of the known commands.
1031 * e.g., md1c20 should match md.
1032 */
1033 if (i == kdb_max_commands) {
1034 for_each_kdbcmd(tp, i) {
1035 if (tp->cmd_name) {
1036 if (strncmp(argv[0],
1037 tp->cmd_name,
1038 strlen(tp->cmd_name)) == 0) {
1039 break;
1040 }
1041 }
1042 }
1043 }
1044
1045 if (i < kdb_max_commands) {
1046 int result;
1047
1048 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1049 return KDB_NOPERM;
1050
1051 KDB_STATE_SET(CMD);
1052 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1053 if (result && ignore_errors && result > KDB_CMD_GO)
1054 result = 0;
1055 KDB_STATE_CLEAR(CMD);
1056
1057 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1058 return result;
1059
1060 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1061 if (argv[argc])
1062 *(argv[argc]) = '\0';
1063 return result;
1064 }
1065
1066 /*
1067 * If the input with which we were presented does not
1068 * map to an existing command, attempt to parse it as an
1069 * address argument and display the result. Useful for
1070 * obtaining the address of a variable, or the nearest symbol
1071 * to an address contained in a register.
1072 */
1073 {
1074 unsigned long value;
1075 char *name = NULL;
1076 long offset;
1077 int nextarg = 0;
1078
1079 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1080 &value, &offset, &name)) {
1081 return KDB_NOTFOUND;
1082 }
1083
1084 kdb_printf("%s = ", argv[0]);
1085 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1086 kdb_printf("\n");
1087 return 0;
1088 }
1089}
1090
1091
1092static int handle_ctrl_cmd(char *cmd)
1093{
1094#define CTRL_P 16
1095#define CTRL_N 14
1096
1097 /* initial situation */
1098 if (cmd_head == cmd_tail)
1099 return 0;
1100 switch (*cmd) {
1101 case CTRL_P:
1102 if (cmdptr != cmd_tail)
1103 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1104 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1105 return 1;
1106 case CTRL_N:
1107 if (cmdptr != cmd_head)
1108 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1109 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1110 return 1;
1111 }
1112 return 0;
1113}
1114
1115/*
1116 * kdb_reboot - This function implements the 'reboot' command. Reboot
1117 * the system immediately, or loop for ever on failure.
1118 */
1119static int kdb_reboot(int argc, const char **argv)
1120{
1121 emergency_restart();
1122 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1123 while (1)
1124 cpu_relax();
1125 /* NOTREACHED */
1126 return 0;
1127}
1128
1129static void kdb_dumpregs(struct pt_regs *regs)
1130{
1131 int old_lvl = console_loglevel;
1132 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1133 kdb_trap_printk++;
1134 show_regs(regs);
1135 kdb_trap_printk--;
1136 kdb_printf("\n");
1137 console_loglevel = old_lvl;
1138}
1139
1140void kdb_set_current_task(struct task_struct *p)
1141{
1142 kdb_current_task = p;
1143
1144 if (kdb_task_has_cpu(p)) {
1145 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1146 return;
1147 }
1148 kdb_current_regs = NULL;
1149}
1150
1151/*
1152 * kdb_local - The main code for kdb. This routine is invoked on a
1153 * specific processor, it is not global. The main kdb() routine
1154 * ensures that only one processor at a time is in this routine.
1155 * This code is called with the real reason code on the first
1156 * entry to a kdb session, thereafter it is called with reason
1157 * SWITCH, even if the user goes back to the original cpu.
1158 * Inputs:
1159 * reason The reason KDB was invoked
1160 * error The hardware-defined error code
1161 * regs The exception frame at time of fault/breakpoint.
1162 * db_result Result code from the break or debug point.
1163 * Returns:
1164 * 0 KDB was invoked for an event which it wasn't responsible
1165 * 1 KDB handled the event for which it was invoked.
1166 * KDB_CMD_GO User typed 'go'.
1167 * KDB_CMD_CPU User switched to another cpu.
1168 * KDB_CMD_SS Single step.
1169 */
1170static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1171 kdb_dbtrap_t db_result)
1172{
1173 char *cmdbuf;
1174 int diag;
1175 struct task_struct *kdb_current =
1176 kdb_curr_task(raw_smp_processor_id());
1177
1178 KDB_DEBUG_STATE("kdb_local 1", reason);
1179 kdb_go_count = 0;
1180 if (reason == KDB_REASON_DEBUG) {
1181 /* special case below */
1182 } else {
1183 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1184 kdb_current, kdb_current ? kdb_current->pid : 0);
1185#if defined(CONFIG_SMP)
1186 kdb_printf("on processor %d ", raw_smp_processor_id());
1187#endif
1188 }
1189
1190 switch (reason) {
1191 case KDB_REASON_DEBUG:
1192 {
1193 /*
1194 * If re-entering kdb after a single step
1195 * command, don't print the message.
1196 */
1197 switch (db_result) {
1198 case KDB_DB_BPT:
1199 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1200 kdb_current, kdb_current->pid);
1201#if defined(CONFIG_SMP)
1202 kdb_printf("on processor %d ", raw_smp_processor_id());
1203#endif
1204 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1205 instruction_pointer(regs));
1206 break;
1207 case KDB_DB_SS:
1208 break;
1209 case KDB_DB_SSBPT:
1210 KDB_DEBUG_STATE("kdb_local 4", reason);
1211 return 1; /* kdba_db_trap did the work */
1212 default:
1213 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1214 db_result);
1215 break;
1216 }
1217
1218 }
1219 break;
1220 case KDB_REASON_ENTER:
1221 if (KDB_STATE(KEYBOARD))
1222 kdb_printf("due to Keyboard Entry\n");
1223 else
1224 kdb_printf("due to KDB_ENTER()\n");
1225 break;
1226 case KDB_REASON_KEYBOARD:
1227 KDB_STATE_SET(KEYBOARD);
1228 kdb_printf("due to Keyboard Entry\n");
1229 break;
1230 case KDB_REASON_ENTER_SLAVE:
1231 /* drop through, slaves only get released via cpu switch */
1232 case KDB_REASON_SWITCH:
1233 kdb_printf("due to cpu switch\n");
1234 break;
1235 case KDB_REASON_OOPS:
1236 kdb_printf("Oops: %s\n", kdb_diemsg);
1237 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1238 instruction_pointer(regs));
1239 kdb_dumpregs(regs);
1240 break;
1241 case KDB_REASON_SYSTEM_NMI:
1242 kdb_printf("due to System NonMaskable Interrupt\n");
1243 break;
1244 case KDB_REASON_NMI:
1245 kdb_printf("due to NonMaskable Interrupt @ "
1246 kdb_machreg_fmt "\n",
1247 instruction_pointer(regs));
1248 break;
1249 case KDB_REASON_SSTEP:
1250 case KDB_REASON_BREAK:
1251 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1252 reason == KDB_REASON_BREAK ?
1253 "Breakpoint" : "SS trap", instruction_pointer(regs));
1254 /*
1255 * Determine if this breakpoint is one that we
1256 * are interested in.
1257 */
1258 if (db_result != KDB_DB_BPT) {
1259 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1260 db_result);
1261 KDB_DEBUG_STATE("kdb_local 6", reason);
1262 return 0; /* Not for us, dismiss it */
1263 }
1264 break;
1265 case KDB_REASON_RECURSE:
1266 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1267 instruction_pointer(regs));
1268 break;
1269 default:
1270 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1271 KDB_DEBUG_STATE("kdb_local 8", reason);
1272 return 0; /* Not for us, dismiss it */
1273 }
1274
1275 while (1) {
1276 /*
1277 * Initialize pager context.
1278 */
1279 kdb_nextline = 1;
1280 KDB_STATE_CLEAR(SUPPRESS);
1281 kdb_grepping_flag = 0;
1282 /* ensure the old search does not leak into '/' commands */
1283 kdb_grep_string[0] = '\0';
1284
1285 cmdbuf = cmd_cur;
1286 *cmdbuf = '\0';
1287 *(cmd_hist[cmd_head]) = '\0';
1288
1289do_full_getstr:
1290#if defined(CONFIG_SMP)
1291 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1292 raw_smp_processor_id());
1293#else
1294 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1295#endif
1296 if (defcmd_in_progress)
1297 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1298
1299 /*
1300 * Fetch command from keyboard
1301 */
1302 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1303 if (*cmdbuf != '\n') {
1304 if (*cmdbuf < 32) {
1305 if (cmdptr == cmd_head) {
1306 strncpy(cmd_hist[cmd_head], cmd_cur,
1307 CMD_BUFLEN);
1308 *(cmd_hist[cmd_head] +
1309 strlen(cmd_hist[cmd_head])-1) = '\0';
1310 }
1311 if (!handle_ctrl_cmd(cmdbuf))
1312 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1313 cmdbuf = cmd_cur;
1314 goto do_full_getstr;
1315 } else {
1316 strncpy(cmd_hist[cmd_head], cmd_cur,
1317 CMD_BUFLEN);
1318 }
1319
1320 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1321 if (cmd_head == cmd_tail)
1322 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1323 }
1324
1325 cmdptr = cmd_head;
1326 diag = kdb_parse(cmdbuf);
1327 if (diag == KDB_NOTFOUND) {
1328 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1329 diag = 0;
1330 }
1331 if (diag == KDB_CMD_GO
1332 || diag == KDB_CMD_CPU
1333 || diag == KDB_CMD_SS
1334 || diag == KDB_CMD_KGDB)
1335 break;
1336
1337 if (diag)
1338 kdb_cmderror(diag);
1339 }
1340 KDB_DEBUG_STATE("kdb_local 9", diag);
1341 return diag;
1342}
1343
1344
1345/*
1346 * kdb_print_state - Print the state data for the current processor
1347 * for debugging.
1348 * Inputs:
1349 * text Identifies the debug point
1350 * value Any integer value to be printed, e.g. reason code.
1351 */
1352void kdb_print_state(const char *text, int value)
1353{
1354 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1355 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1356 kdb_state);
1357}
1358
1359/*
1360 * kdb_main_loop - After initial setup and assignment of the
1361 * controlling cpu, all cpus are in this loop. One cpu is in
1362 * control and will issue the kdb prompt, the others will spin
1363 * until 'go' or cpu switch.
1364 *
1365 * To get a consistent view of the kernel stacks for all
1366 * processes, this routine is invoked from the main kdb code via
1367 * an architecture specific routine. kdba_main_loop is
1368 * responsible for making the kernel stacks consistent for all
1369 * processes, there should be no difference between a blocked
1370 * process and a running process as far as kdb is concerned.
1371 * Inputs:
1372 * reason The reason KDB was invoked
1373 * error The hardware-defined error code
1374 * reason2 kdb's current reason code.
1375 * Initially error but can change
1376 * according to kdb state.
1377 * db_result Result code from break or debug point.
1378 * regs The exception frame at time of fault/breakpoint.
1379 * should always be valid.
1380 * Returns:
1381 * 0 KDB was invoked for an event which it wasn't responsible
1382 * 1 KDB handled the event for which it was invoked.
1383 */
1384int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1385 kdb_dbtrap_t db_result, struct pt_regs *regs)
1386{
1387 int result = 1;
1388 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1389 while (1) {
1390 /*
1391 * All processors except the one that is in control
1392 * will spin here.
1393 */
1394 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1395 while (KDB_STATE(HOLD_CPU)) {
1396 /* state KDB is turned off by kdb_cpu to see if the
1397 * other cpus are still live, each cpu in this loop
1398 * turns it back on.
1399 */
1400 if (!KDB_STATE(KDB))
1401 KDB_STATE_SET(KDB);
1402 }
1403
1404 KDB_STATE_CLEAR(SUPPRESS);
1405 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1406 if (KDB_STATE(LEAVING))
1407 break; /* Another cpu said 'go' */
1408 /* Still using kdb, this processor is in control */
1409 result = kdb_local(reason2, error, regs, db_result);
1410 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1411
1412 if (result == KDB_CMD_CPU)
1413 break;
1414
1415 if (result == KDB_CMD_SS) {
1416 KDB_STATE_SET(DOING_SS);
1417 break;
1418 }
1419
1420 if (result == KDB_CMD_KGDB) {
1421 if (!KDB_STATE(DOING_KGDB))
1422 kdb_printf("Entering please attach debugger "
1423 "or use $D#44+ or $3#33\n");
1424 break;
1425 }
1426 if (result && result != 1 && result != KDB_CMD_GO)
1427 kdb_printf("\nUnexpected kdb_local return code %d\n",
1428 result);
1429 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1430 break;
1431 }
1432 if (KDB_STATE(DOING_SS))
1433 KDB_STATE_CLEAR(SSBPT);
1434
1435 /* Clean up any keyboard devices before leaving */
1436 kdb_kbd_cleanup_state();
1437
1438 return result;
1439}
1440
1441/*
1442 * kdb_mdr - This function implements the guts of the 'mdr', memory
1443 * read command.
1444 * mdr <addr arg>,<byte count>
1445 * Inputs:
1446 * addr Start address
1447 * count Number of bytes
1448 * Returns:
1449 * Always 0. Any errors are detected and printed by kdb_getarea.
1450 */
1451static int kdb_mdr(unsigned long addr, unsigned int count)
1452{
1453 unsigned char c;
1454 while (count--) {
1455 if (kdb_getarea(c, addr))
1456 return 0;
1457 kdb_printf("%02x", c);
1458 addr++;
1459 }
1460 kdb_printf("\n");
1461 return 0;
1462}
1463
1464/*
1465 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1466 * 'md8' 'mdr' and 'mds' commands.
1467 *
1468 * md|mds [<addr arg> [<line count> [<radix>]]]
1469 * mdWcN [<addr arg> [<line count> [<radix>]]]
1470 * where W = is the width (1, 2, 4 or 8) and N is the count.
1471 * for eg., md1c20 reads 20 bytes, 1 at a time.
1472 * mdr <addr arg>,<byte count>
1473 */
1474static void kdb_md_line(const char *fmtstr, unsigned long addr,
1475 int symbolic, int nosect, int bytesperword,
1476 int num, int repeat, int phys)
1477{
1478 /* print just one line of data */
1479 kdb_symtab_t symtab;
1480 char cbuf[32];
1481 char *c = cbuf;
1482 int i;
1483 unsigned long word;
1484
1485 memset(cbuf, '\0', sizeof(cbuf));
1486 if (phys)
1487 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1488 else
1489 kdb_printf(kdb_machreg_fmt0 " ", addr);
1490
1491 for (i = 0; i < num && repeat--; i++) {
1492 if (phys) {
1493 if (kdb_getphysword(&word, addr, bytesperword))
1494 break;
1495 } else if (kdb_getword(&word, addr, bytesperword))
1496 break;
1497 kdb_printf(fmtstr, word);
1498 if (symbolic)
1499 kdbnearsym(word, &symtab);
1500 else
1501 memset(&symtab, 0, sizeof(symtab));
1502 if (symtab.sym_name) {
1503 kdb_symbol_print(word, &symtab, 0);
1504 if (!nosect) {
1505 kdb_printf("\n");
1506 kdb_printf(" %s %s "
1507 kdb_machreg_fmt " "
1508 kdb_machreg_fmt " "
1509 kdb_machreg_fmt, symtab.mod_name,
1510 symtab.sec_name, symtab.sec_start,
1511 symtab.sym_start, symtab.sym_end);
1512 }
1513 addr += bytesperword;
1514 } else {
1515 union {
1516 u64 word;
1517 unsigned char c[8];
1518 } wc;
1519 unsigned char *cp;
1520#ifdef __BIG_ENDIAN
1521 cp = wc.c + 8 - bytesperword;
1522#else
1523 cp = wc.c;
1524#endif
1525 wc.word = word;
1526#define printable_char(c) \
1527 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1528 switch (bytesperword) {
1529 case 8:
1530 *c++ = printable_char(*cp++);
1531 *c++ = printable_char(*cp++);
1532 *c++ = printable_char(*cp++);
1533 *c++ = printable_char(*cp++);
1534 addr += 4;
1535 case 4:
1536 *c++ = printable_char(*cp++);
1537 *c++ = printable_char(*cp++);
1538 addr += 2;
1539 case 2:
1540 *c++ = printable_char(*cp++);
1541 addr++;
1542 case 1:
1543 *c++ = printable_char(*cp++);
1544 addr++;
1545 break;
1546 }
1547#undef printable_char
1548 }
1549 }
1550 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1551 " ", cbuf);
1552}
1553
1554static int kdb_md(int argc, const char **argv)
1555{
1556 static unsigned long last_addr;
1557 static int last_radix, last_bytesperword, last_repeat;
1558 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1559 int nosect = 0;
1560 char fmtchar, fmtstr[64];
1561 unsigned long addr;
1562 unsigned long word;
1563 long offset = 0;
1564 int symbolic = 0;
1565 int valid = 0;
1566 int phys = 0;
1567
1568 kdbgetintenv("MDCOUNT", &mdcount);
1569 kdbgetintenv("RADIX", &radix);
1570 kdbgetintenv("BYTESPERWORD", &bytesperword);
1571
1572 /* Assume 'md <addr>' and start with environment values */
1573 repeat = mdcount * 16 / bytesperword;
1574
1575 if (strcmp(argv[0], "mdr") == 0) {
1576 if (argc != 2)
1577 return KDB_ARGCOUNT;
1578 valid = 1;
1579 } else if (isdigit(argv[0][2])) {
1580 bytesperword = (int)(argv[0][2] - '0');
1581 if (bytesperword == 0) {
1582 bytesperword = last_bytesperword;
1583 if (bytesperword == 0)
1584 bytesperword = 4;
1585 }
1586 last_bytesperword = bytesperword;
1587 repeat = mdcount * 16 / bytesperword;
1588 if (!argv[0][3])
1589 valid = 1;
1590 else if (argv[0][3] == 'c' && argv[0][4]) {
1591 char *p;
1592 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1593 mdcount = ((repeat * bytesperword) + 15) / 16;
1594 valid = !*p;
1595 }
1596 last_repeat = repeat;
1597 } else if (strcmp(argv[0], "md") == 0)
1598 valid = 1;
1599 else if (strcmp(argv[0], "mds") == 0)
1600 valid = 1;
1601 else if (strcmp(argv[0], "mdp") == 0) {
1602 phys = valid = 1;
1603 }
1604 if (!valid)
1605 return KDB_NOTFOUND;
1606
1607 if (argc == 0) {
1608 if (last_addr == 0)
1609 return KDB_ARGCOUNT;
1610 addr = last_addr;
1611 radix = last_radix;
1612 bytesperword = last_bytesperword;
1613 repeat = last_repeat;
1614 mdcount = ((repeat * bytesperword) + 15) / 16;
1615 }
1616
1617 if (argc) {
1618 unsigned long val;
1619 int diag, nextarg = 1;
1620 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1621 &offset, NULL);
1622 if (diag)
1623 return diag;
1624 if (argc > nextarg+2)
1625 return KDB_ARGCOUNT;
1626
1627 if (argc >= nextarg) {
1628 diag = kdbgetularg(argv[nextarg], &val);
1629 if (!diag) {
1630 mdcount = (int) val;
1631 repeat = mdcount * 16 / bytesperword;
1632 }
1633 }
1634 if (argc >= nextarg+1) {
1635 diag = kdbgetularg(argv[nextarg+1], &val);
1636 if (!diag)
1637 radix = (int) val;
1638 }
1639 }
1640
1641 if (strcmp(argv[0], "mdr") == 0)
1642 return kdb_mdr(addr, mdcount);
1643
1644 switch (radix) {
1645 case 10:
1646 fmtchar = 'd';
1647 break;
1648 case 16:
1649 fmtchar = 'x';
1650 break;
1651 case 8:
1652 fmtchar = 'o';
1653 break;
1654 default:
1655 return KDB_BADRADIX;
1656 }
1657
1658 last_radix = radix;
1659
1660 if (bytesperword > KDB_WORD_SIZE)
1661 return KDB_BADWIDTH;
1662
1663 switch (bytesperword) {
1664 case 8:
1665 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1666 break;
1667 case 4:
1668 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1669 break;
1670 case 2:
1671 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1672 break;
1673 case 1:
1674 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1675 break;
1676 default:
1677 return KDB_BADWIDTH;
1678 }
1679
1680 last_repeat = repeat;
1681 last_bytesperword = bytesperword;
1682
1683 if (strcmp(argv[0], "mds") == 0) {
1684 symbolic = 1;
1685 /* Do not save these changes as last_*, they are temporary mds
1686 * overrides.
1687 */
1688 bytesperword = KDB_WORD_SIZE;
1689 repeat = mdcount;
1690 kdbgetintenv("NOSECT", &nosect);
1691 }
1692
1693 /* Round address down modulo BYTESPERWORD */
1694
1695 addr &= ~(bytesperword-1);
1696
1697 while (repeat > 0) {
1698 unsigned long a;
1699 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1700
1701 if (KDB_FLAG(CMD_INTERRUPT))
1702 return 0;
1703 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1704 if (phys) {
1705 if (kdb_getphysword(&word, a, bytesperword)
1706 || word)
1707 break;
1708 } else if (kdb_getword(&word, a, bytesperword) || word)
1709 break;
1710 }
1711 n = min(num, repeat);
1712 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1713 num, repeat, phys);
1714 addr += bytesperword * n;
1715 repeat -= n;
1716 z = (z + num - 1) / num;
1717 if (z > 2) {
1718 int s = num * (z-2);
1719 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1720 " zero suppressed\n",
1721 addr, addr + bytesperword * s - 1);
1722 addr += bytesperword * s;
1723 repeat -= s;
1724 }
1725 }
1726 last_addr = addr;
1727
1728 return 0;
1729}
1730
1731/*
1732 * kdb_mm - This function implements the 'mm' command.
1733 * mm address-expression new-value
1734 * Remarks:
1735 * mm works on machine words, mmW works on bytes.
1736 */
1737static int kdb_mm(int argc, const char **argv)
1738{
1739 int diag;
1740 unsigned long addr;
1741 long offset = 0;
1742 unsigned long contents;
1743 int nextarg;
1744 int width;
1745
1746 if (argv[0][2] && !isdigit(argv[0][2]))
1747 return KDB_NOTFOUND;
1748
1749 if (argc < 2)
1750 return KDB_ARGCOUNT;
1751
1752 nextarg = 1;
1753 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1754 if (diag)
1755 return diag;
1756
1757 if (nextarg > argc)
1758 return KDB_ARGCOUNT;
1759 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1760 if (diag)
1761 return diag;
1762
1763 if (nextarg != argc + 1)
1764 return KDB_ARGCOUNT;
1765
1766 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1767 diag = kdb_putword(addr, contents, width);
1768 if (diag)
1769 return diag;
1770
1771 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1772
1773 return 0;
1774}
1775
1776/*
1777 * kdb_go - This function implements the 'go' command.
1778 * go [address-expression]
1779 */
1780static int kdb_go(int argc, const char **argv)
1781{
1782 unsigned long addr;
1783 int diag;
1784 int nextarg;
1785 long offset;
1786
1787 if (raw_smp_processor_id() != kdb_initial_cpu) {
1788 kdb_printf("go must execute on the entry cpu, "
1789 "please use \"cpu %d\" and then execute go\n",
1790 kdb_initial_cpu);
1791 return KDB_BADCPUNUM;
1792 }
1793 if (argc == 1) {
1794 nextarg = 1;
1795 diag = kdbgetaddrarg(argc, argv, &nextarg,
1796 &addr, &offset, NULL);
1797 if (diag)
1798 return diag;
1799 } else if (argc) {
1800 return KDB_ARGCOUNT;
1801 }
1802
1803 diag = KDB_CMD_GO;
1804 if (KDB_FLAG(CATASTROPHIC)) {
1805 kdb_printf("Catastrophic error detected\n");
1806 kdb_printf("kdb_continue_catastrophic=%d, ",
1807 kdb_continue_catastrophic);
1808 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1809 kdb_printf("type go a second time if you really want "
1810 "to continue\n");
1811 return 0;
1812 }
1813 if (kdb_continue_catastrophic == 2) {
1814 kdb_printf("forcing reboot\n");
1815 kdb_reboot(0, NULL);
1816 }
1817 kdb_printf("attempting to continue\n");
1818 }
1819 return diag;
1820}
1821
1822/*
1823 * kdb_rd - This function implements the 'rd' command.
1824 */
1825static int kdb_rd(int argc, const char **argv)
1826{
1827 int len = kdb_check_regs();
1828#if DBG_MAX_REG_NUM > 0
1829 int i;
1830 char *rname;
1831 int rsize;
1832 u64 reg64;
1833 u32 reg32;
1834 u16 reg16;
1835 u8 reg8;
1836
1837 if (len)
1838 return len;
1839
1840 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1841 rsize = dbg_reg_def[i].size * 2;
1842 if (rsize > 16)
1843 rsize = 2;
1844 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1845 len = 0;
1846 kdb_printf("\n");
1847 }
1848 if (len)
1849 len += kdb_printf(" ");
1850 switch(dbg_reg_def[i].size * 8) {
1851 case 8:
1852 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1853 if (!rname)
1854 break;
1855 len += kdb_printf("%s: %02x", rname, reg8);
1856 break;
1857 case 16:
1858 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1859 if (!rname)
1860 break;
1861 len += kdb_printf("%s: %04x", rname, reg16);
1862 break;
1863 case 32:
1864 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1865 if (!rname)
1866 break;
1867 len += kdb_printf("%s: %08x", rname, reg32);
1868 break;
1869 case 64:
1870 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1871 if (!rname)
1872 break;
1873 len += kdb_printf("%s: %016llx", rname, reg64);
1874 break;
1875 default:
1876 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1877 }
1878 }
1879 kdb_printf("\n");
1880#else
1881 if (len)
1882 return len;
1883
1884 kdb_dumpregs(kdb_current_regs);
1885#endif
1886 return 0;
1887}
1888
1889/*
1890 * kdb_rm - This function implements the 'rm' (register modify) command.
1891 * rm register-name new-contents
1892 * Remarks:
1893 * Allows register modification with the same restrictions as gdb
1894 */
1895static int kdb_rm(int argc, const char **argv)
1896{
1897#if DBG_MAX_REG_NUM > 0
1898 int diag;
1899 const char *rname;
1900 int i;
1901 u64 reg64;
1902 u32 reg32;
1903 u16 reg16;
1904 u8 reg8;
1905
1906 if (argc != 2)
1907 return KDB_ARGCOUNT;
1908 /*
1909 * Allow presence or absence of leading '%' symbol.
1910 */
1911 rname = argv[1];
1912 if (*rname == '%')
1913 rname++;
1914
1915 diag = kdbgetu64arg(argv[2], ®64);
1916 if (diag)
1917 return diag;
1918
1919 diag = kdb_check_regs();
1920 if (diag)
1921 return diag;
1922
1923 diag = KDB_BADREG;
1924 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1925 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1926 diag = 0;
1927 break;
1928 }
1929 }
1930 if (!diag) {
1931 switch(dbg_reg_def[i].size * 8) {
1932 case 8:
1933 reg8 = reg64;
1934 dbg_set_reg(i, ®8, kdb_current_regs);
1935 break;
1936 case 16:
1937 reg16 = reg64;
1938 dbg_set_reg(i, ®16, kdb_current_regs);
1939 break;
1940 case 32:
1941 reg32 = reg64;
1942 dbg_set_reg(i, ®32, kdb_current_regs);
1943 break;
1944 case 64:
1945 dbg_set_reg(i, ®64, kdb_current_regs);
1946 break;
1947 }
1948 }
1949 return diag;
1950#else
1951 kdb_printf("ERROR: Register set currently not implemented\n");
1952 return 0;
1953#endif
1954}
1955
1956#if defined(CONFIG_MAGIC_SYSRQ)
1957/*
1958 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1959 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1960 * sr <magic-sysrq-code>
1961 */
1962static int kdb_sr(int argc, const char **argv)
1963{
1964 bool check_mask =
1965 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1966
1967 if (argc != 1)
1968 return KDB_ARGCOUNT;
1969
1970 kdb_trap_printk++;
1971 __handle_sysrq(*argv[1], check_mask);
1972 kdb_trap_printk--;
1973
1974 return 0;
1975}
1976#endif /* CONFIG_MAGIC_SYSRQ */
1977
1978/*
1979 * kdb_ef - This function implements the 'regs' (display exception
1980 * frame) command. This command takes an address and expects to
1981 * find an exception frame at that address, formats and prints
1982 * it.
1983 * regs address-expression
1984 * Remarks:
1985 * Not done yet.
1986 */
1987static int kdb_ef(int argc, const char **argv)
1988{
1989 int diag;
1990 unsigned long addr;
1991 long offset;
1992 int nextarg;
1993
1994 if (argc != 1)
1995 return KDB_ARGCOUNT;
1996
1997 nextarg = 1;
1998 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1999 if (diag)
2000 return diag;
2001 show_regs((struct pt_regs *)addr);
2002 return 0;
2003}
2004
2005#if defined(CONFIG_MODULES)
2006/*
2007 * kdb_lsmod - This function implements the 'lsmod' command. Lists
2008 * currently loaded kernel modules.
2009 * Mostly taken from userland lsmod.
2010 */
2011static int kdb_lsmod(int argc, const char **argv)
2012{
2013 struct module *mod;
2014
2015 if (argc != 0)
2016 return KDB_ARGCOUNT;
2017
2018 kdb_printf("Module Size modstruct Used by\n");
2019 list_for_each_entry(mod, kdb_modules, list) {
2020 if (mod->state == MODULE_STATE_UNFORMED)
2021 continue;
2022
2023 kdb_printf("%-20s%8u 0x%p ", mod->name,
2024 mod->core_layout.size, (void *)mod);
2025#ifdef CONFIG_MODULE_UNLOAD
2026 kdb_printf("%4d ", module_refcount(mod));
2027#endif
2028 if (mod->state == MODULE_STATE_GOING)
2029 kdb_printf(" (Unloading)");
2030 else if (mod->state == MODULE_STATE_COMING)
2031 kdb_printf(" (Loading)");
2032 else
2033 kdb_printf(" (Live)");
2034 kdb_printf(" 0x%p", mod->core_layout.base);
2035
2036#ifdef CONFIG_MODULE_UNLOAD
2037 {
2038 struct module_use *use;
2039 kdb_printf(" [ ");
2040 list_for_each_entry(use, &mod->source_list,
2041 source_list)
2042 kdb_printf("%s ", use->target->name);
2043 kdb_printf("]\n");
2044 }
2045#endif
2046 }
2047
2048 return 0;
2049}
2050
2051#endif /* CONFIG_MODULES */
2052
2053/*
2054 * kdb_env - This function implements the 'env' command. Display the
2055 * current environment variables.
2056 */
2057
2058static int kdb_env(int argc, const char **argv)
2059{
2060 int i;
2061
2062 for (i = 0; i < __nenv; i++) {
2063 if (__env[i])
2064 kdb_printf("%s\n", __env[i]);
2065 }
2066
2067 if (KDB_DEBUG(MASK))
2068 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2069
2070 return 0;
2071}
2072
2073#ifdef CONFIG_PRINTK
2074/*
2075 * kdb_dmesg - This function implements the 'dmesg' command to display
2076 * the contents of the syslog buffer.
2077 * dmesg [lines] [adjust]
2078 */
2079static int kdb_dmesg(int argc, const char **argv)
2080{
2081 int diag;
2082 int logging;
2083 int lines = 0;
2084 int adjust = 0;
2085 int n = 0;
2086 int skip = 0;
2087 struct kmsg_dumper dumper = { .active = 1 };
2088 size_t len;
2089 char buf[201];
2090
2091 if (argc > 2)
2092 return KDB_ARGCOUNT;
2093 if (argc) {
2094 char *cp;
2095 lines = simple_strtol(argv[1], &cp, 0);
2096 if (*cp)
2097 lines = 0;
2098 if (argc > 1) {
2099 adjust = simple_strtoul(argv[2], &cp, 0);
2100 if (*cp || adjust < 0)
2101 adjust = 0;
2102 }
2103 }
2104
2105 /* disable LOGGING if set */
2106 diag = kdbgetintenv("LOGGING", &logging);
2107 if (!diag && logging) {
2108 const char *setargs[] = { "set", "LOGGING", "0" };
2109 kdb_set(2, setargs);
2110 }
2111
2112 kmsg_dump_rewind_nolock(&dumper);
2113 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2114 n++;
2115
2116 if (lines < 0) {
2117 if (adjust >= n)
2118 kdb_printf("buffer only contains %d lines, nothing "
2119 "printed\n", n);
2120 else if (adjust - lines >= n)
2121 kdb_printf("buffer only contains %d lines, last %d "
2122 "lines printed\n", n, n - adjust);
2123 skip = adjust;
2124 lines = abs(lines);
2125 } else if (lines > 0) {
2126 skip = n - lines - adjust;
2127 lines = abs(lines);
2128 if (adjust >= n) {
2129 kdb_printf("buffer only contains %d lines, "
2130 "nothing printed\n", n);
2131 skip = n;
2132 } else if (skip < 0) {
2133 lines += skip;
2134 skip = 0;
2135 kdb_printf("buffer only contains %d lines, first "
2136 "%d lines printed\n", n, lines);
2137 }
2138 } else {
2139 lines = n;
2140 }
2141
2142 if (skip >= n || skip < 0)
2143 return 0;
2144
2145 kmsg_dump_rewind_nolock(&dumper);
2146 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2147 if (skip) {
2148 skip--;
2149 continue;
2150 }
2151 if (!lines--)
2152 break;
2153 if (KDB_FLAG(CMD_INTERRUPT))
2154 return 0;
2155
2156 kdb_printf("%.*s\n", (int)len - 1, buf);
2157 }
2158
2159 return 0;
2160}
2161#endif /* CONFIG_PRINTK */
2162
2163/* Make sure we balance enable/disable calls, must disable first. */
2164static atomic_t kdb_nmi_disabled;
2165
2166static int kdb_disable_nmi(int argc, const char *argv[])
2167{
2168 if (atomic_read(&kdb_nmi_disabled))
2169 return 0;
2170 atomic_set(&kdb_nmi_disabled, 1);
2171 arch_kgdb_ops.enable_nmi(0);
2172 return 0;
2173}
2174
2175static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2176{
2177 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2178 return -EINVAL;
2179 arch_kgdb_ops.enable_nmi(1);
2180 return 0;
2181}
2182
2183static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2184 .set = kdb_param_enable_nmi,
2185};
2186module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2187
2188/*
2189 * kdb_cpu - This function implements the 'cpu' command.
2190 * cpu [<cpunum>]
2191 * Returns:
2192 * KDB_CMD_CPU for success, a kdb diagnostic if error
2193 */
2194static void kdb_cpu_status(void)
2195{
2196 int i, start_cpu, first_print = 1;
2197 char state, prev_state = '?';
2198
2199 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2200 kdb_printf("Available cpus: ");
2201 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2202 if (!cpu_online(i)) {
2203 state = 'F'; /* cpu is offline */
2204 } else if (!kgdb_info[i].enter_kgdb) {
2205 state = 'D'; /* cpu is online but unresponsive */
2206 } else {
2207 state = ' '; /* cpu is responding to kdb */
2208 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2209 state = 'I'; /* idle task */
2210 }
2211 if (state != prev_state) {
2212 if (prev_state != '?') {
2213 if (!first_print)
2214 kdb_printf(", ");
2215 first_print = 0;
2216 kdb_printf("%d", start_cpu);
2217 if (start_cpu < i-1)
2218 kdb_printf("-%d", i-1);
2219 if (prev_state != ' ')
2220 kdb_printf("(%c)", prev_state);
2221 }
2222 prev_state = state;
2223 start_cpu = i;
2224 }
2225 }
2226 /* print the trailing cpus, ignoring them if they are all offline */
2227 if (prev_state != 'F') {
2228 if (!first_print)
2229 kdb_printf(", ");
2230 kdb_printf("%d", start_cpu);
2231 if (start_cpu < i-1)
2232 kdb_printf("-%d", i-1);
2233 if (prev_state != ' ')
2234 kdb_printf("(%c)", prev_state);
2235 }
2236 kdb_printf("\n");
2237}
2238
2239static int kdb_cpu(int argc, const char **argv)
2240{
2241 unsigned long cpunum;
2242 int diag;
2243
2244 if (argc == 0) {
2245 kdb_cpu_status();
2246 return 0;
2247 }
2248
2249 if (argc != 1)
2250 return KDB_ARGCOUNT;
2251
2252 diag = kdbgetularg(argv[1], &cpunum);
2253 if (diag)
2254 return diag;
2255
2256 /*
2257 * Validate cpunum
2258 */
2259 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2260 return KDB_BADCPUNUM;
2261
2262 dbg_switch_cpu = cpunum;
2263
2264 /*
2265 * Switch to other cpu
2266 */
2267 return KDB_CMD_CPU;
2268}
2269
2270/* The user may not realize that ps/bta with no parameters does not print idle
2271 * or sleeping system daemon processes, so tell them how many were suppressed.
2272 */
2273void kdb_ps_suppressed(void)
2274{
2275 int idle = 0, daemon = 0;
2276 unsigned long mask_I = kdb_task_state_string("I"),
2277 mask_M = kdb_task_state_string("M");
2278 unsigned long cpu;
2279 const struct task_struct *p, *g;
2280 for_each_online_cpu(cpu) {
2281 p = kdb_curr_task(cpu);
2282 if (kdb_task_state(p, mask_I))
2283 ++idle;
2284 }
2285 kdb_do_each_thread(g, p) {
2286 if (kdb_task_state(p, mask_M))
2287 ++daemon;
2288 } kdb_while_each_thread(g, p);
2289 if (idle || daemon) {
2290 if (idle)
2291 kdb_printf("%d idle process%s (state I)%s\n",
2292 idle, idle == 1 ? "" : "es",
2293 daemon ? " and " : "");
2294 if (daemon)
2295 kdb_printf("%d sleeping system daemon (state M) "
2296 "process%s", daemon,
2297 daemon == 1 ? "" : "es");
2298 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2299 }
2300}
2301
2302/*
2303 * kdb_ps - This function implements the 'ps' command which shows a
2304 * list of the active processes.
2305 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2306 */
2307void kdb_ps1(const struct task_struct *p)
2308{
2309 int cpu;
2310 unsigned long tmp;
2311
2312 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2313 return;
2314
2315 cpu = kdb_process_cpu(p);
2316 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2317 (void *)p, p->pid, p->parent->pid,
2318 kdb_task_has_cpu(p), kdb_process_cpu(p),
2319 kdb_task_state_char(p),
2320 (void *)(&p->thread),
2321 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2322 p->comm);
2323 if (kdb_task_has_cpu(p)) {
2324 if (!KDB_TSK(cpu)) {
2325 kdb_printf(" Error: no saved data for this cpu\n");
2326 } else {
2327 if (KDB_TSK(cpu) != p)
2328 kdb_printf(" Error: does not match running "
2329 "process table (0x%p)\n", KDB_TSK(cpu));
2330 }
2331 }
2332}
2333
2334static int kdb_ps(int argc, const char **argv)
2335{
2336 struct task_struct *g, *p;
2337 unsigned long mask, cpu;
2338
2339 if (argc == 0)
2340 kdb_ps_suppressed();
2341 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2342 (int)(2*sizeof(void *))+2, "Task Addr",
2343 (int)(2*sizeof(void *))+2, "Thread");
2344 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2345 /* Run the active tasks first */
2346 for_each_online_cpu(cpu) {
2347 if (KDB_FLAG(CMD_INTERRUPT))
2348 return 0;
2349 p = kdb_curr_task(cpu);
2350 if (kdb_task_state(p, mask))
2351 kdb_ps1(p);
2352 }
2353 kdb_printf("\n");
2354 /* Now the real tasks */
2355 kdb_do_each_thread(g, p) {
2356 if (KDB_FLAG(CMD_INTERRUPT))
2357 return 0;
2358 if (kdb_task_state(p, mask))
2359 kdb_ps1(p);
2360 } kdb_while_each_thread(g, p);
2361
2362 return 0;
2363}
2364
2365/*
2366 * kdb_pid - This function implements the 'pid' command which switches
2367 * the currently active process.
2368 * pid [<pid> | R]
2369 */
2370static int kdb_pid(int argc, const char **argv)
2371{
2372 struct task_struct *p;
2373 unsigned long val;
2374 int diag;
2375
2376 if (argc > 1)
2377 return KDB_ARGCOUNT;
2378
2379 if (argc) {
2380 if (strcmp(argv[1], "R") == 0) {
2381 p = KDB_TSK(kdb_initial_cpu);
2382 } else {
2383 diag = kdbgetularg(argv[1], &val);
2384 if (diag)
2385 return KDB_BADINT;
2386
2387 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2388 if (!p) {
2389 kdb_printf("No task with pid=%d\n", (pid_t)val);
2390 return 0;
2391 }
2392 }
2393 kdb_set_current_task(p);
2394 }
2395 kdb_printf("KDB current process is %s(pid=%d)\n",
2396 kdb_current_task->comm,
2397 kdb_current_task->pid);
2398
2399 return 0;
2400}
2401
2402static int kdb_kgdb(int argc, const char **argv)
2403{
2404 return KDB_CMD_KGDB;
2405}
2406
2407/*
2408 * kdb_help - This function implements the 'help' and '?' commands.
2409 */
2410static int kdb_help(int argc, const char **argv)
2411{
2412 kdbtab_t *kt;
2413 int i;
2414
2415 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2416 kdb_printf("-----------------------------"
2417 "-----------------------------\n");
2418 for_each_kdbcmd(kt, i) {
2419 char *space = "";
2420 if (KDB_FLAG(CMD_INTERRUPT))
2421 return 0;
2422 if (!kt->cmd_name)
2423 continue;
2424 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2425 continue;
2426 if (strlen(kt->cmd_usage) > 20)
2427 space = "\n ";
2428 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2429 kt->cmd_usage, space, kt->cmd_help);
2430 }
2431 return 0;
2432}
2433
2434/*
2435 * kdb_kill - This function implements the 'kill' commands.
2436 */
2437static int kdb_kill(int argc, const char **argv)
2438{
2439 long sig, pid;
2440 char *endp;
2441 struct task_struct *p;
2442 struct siginfo info;
2443
2444 if (argc != 2)
2445 return KDB_ARGCOUNT;
2446
2447 sig = simple_strtol(argv[1], &endp, 0);
2448 if (*endp)
2449 return KDB_BADINT;
2450 if (sig >= 0) {
2451 kdb_printf("Invalid signal parameter.<-signal>\n");
2452 return 0;
2453 }
2454 sig = -sig;
2455
2456 pid = simple_strtol(argv[2], &endp, 0);
2457 if (*endp)
2458 return KDB_BADINT;
2459 if (pid <= 0) {
2460 kdb_printf("Process ID must be large than 0.\n");
2461 return 0;
2462 }
2463
2464 /* Find the process. */
2465 p = find_task_by_pid_ns(pid, &init_pid_ns);
2466 if (!p) {
2467 kdb_printf("The specified process isn't found.\n");
2468 return 0;
2469 }
2470 p = p->group_leader;
2471 info.si_signo = sig;
2472 info.si_errno = 0;
2473 info.si_code = SI_USER;
2474 info.si_pid = pid; /* same capabilities as process being signalled */
2475 info.si_uid = 0; /* kdb has root authority */
2476 kdb_send_sig_info(p, &info);
2477 return 0;
2478}
2479
2480struct kdb_tm {
2481 int tm_sec; /* seconds */
2482 int tm_min; /* minutes */
2483 int tm_hour; /* hours */
2484 int tm_mday; /* day of the month */
2485 int tm_mon; /* month */
2486 int tm_year; /* year */
2487};
2488
2489static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2490{
2491 /* This will work from 1970-2099, 2100 is not a leap year */
2492 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2493 31, 30, 31, 30, 31 };
2494 memset(tm, 0, sizeof(*tm));
2495 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2496 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2497 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2498 tm->tm_min = tm->tm_sec / 60 % 60;
2499 tm->tm_hour = tm->tm_sec / 60 / 60;
2500 tm->tm_sec = tm->tm_sec % 60;
2501 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2502 tm->tm_mday %= (4*365+1);
2503 mon_day[1] = 29;
2504 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2505 tm->tm_mday -= mon_day[tm->tm_mon];
2506 if (++tm->tm_mon == 12) {
2507 tm->tm_mon = 0;
2508 ++tm->tm_year;
2509 mon_day[1] = 28;
2510 }
2511 }
2512 ++tm->tm_mday;
2513}
2514
2515/*
2516 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2517 * I cannot call that code directly from kdb, it has an unconditional
2518 * cli()/sti() and calls routines that take locks which can stop the debugger.
2519 */
2520static void kdb_sysinfo(struct sysinfo *val)
2521{
2522 struct timespec uptime;
2523 ktime_get_ts(&uptime);
2524 memset(val, 0, sizeof(*val));
2525 val->uptime = uptime.tv_sec;
2526 val->loads[0] = avenrun[0];
2527 val->loads[1] = avenrun[1];
2528 val->loads[2] = avenrun[2];
2529 val->procs = nr_threads-1;
2530 si_meminfo(val);
2531
2532 return;
2533}
2534
2535/*
2536 * kdb_summary - This function implements the 'summary' command.
2537 */
2538static int kdb_summary(int argc, const char **argv)
2539{
2540 struct timespec now;
2541 struct kdb_tm tm;
2542 struct sysinfo val;
2543
2544 if (argc)
2545 return KDB_ARGCOUNT;
2546
2547 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2548 kdb_printf("release %s\n", init_uts_ns.name.release);
2549 kdb_printf("version %s\n", init_uts_ns.name.version);
2550 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2551 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2552 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2553 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2554
2555 now = __current_kernel_time();
2556 kdb_gmtime(&now, &tm);
2557 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2558 "tz_minuteswest %d\n",
2559 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2560 tm.tm_hour, tm.tm_min, tm.tm_sec,
2561 sys_tz.tz_minuteswest);
2562
2563 kdb_sysinfo(&val);
2564 kdb_printf("uptime ");
2565 if (val.uptime > (24*60*60)) {
2566 int days = val.uptime / (24*60*60);
2567 val.uptime %= (24*60*60);
2568 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2569 }
2570 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2571
2572 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2573
2574#define LOAD_INT(x) ((x) >> FSHIFT)
2575#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2576 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2577 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2578 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2579 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2580#undef LOAD_INT
2581#undef LOAD_FRAC
2582 /* Display in kilobytes */
2583#define K(x) ((x) << (PAGE_SHIFT - 10))
2584 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2585 "Buffers: %8lu kB\n",
2586 K(val.totalram), K(val.freeram), K(val.bufferram));
2587 return 0;
2588}
2589
2590/*
2591 * kdb_per_cpu - This function implements the 'per_cpu' command.
2592 */
2593static int kdb_per_cpu(int argc, const char **argv)
2594{
2595 char fmtstr[64];
2596 int cpu, diag, nextarg = 1;
2597 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2598
2599 if (argc < 1 || argc > 3)
2600 return KDB_ARGCOUNT;
2601
2602 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2603 if (diag)
2604 return diag;
2605
2606 if (argc >= 2) {
2607 diag = kdbgetularg(argv[2], &bytesperword);
2608 if (diag)
2609 return diag;
2610 }
2611 if (!bytesperword)
2612 bytesperword = KDB_WORD_SIZE;
2613 else if (bytesperword > KDB_WORD_SIZE)
2614 return KDB_BADWIDTH;
2615 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2616 if (argc >= 3) {
2617 diag = kdbgetularg(argv[3], &whichcpu);
2618 if (diag)
2619 return diag;
2620 if (!cpu_online(whichcpu)) {
2621 kdb_printf("cpu %ld is not online\n", whichcpu);
2622 return KDB_BADCPUNUM;
2623 }
2624 }
2625
2626 /* Most architectures use __per_cpu_offset[cpu], some use
2627 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2628 */
2629#ifdef __per_cpu_offset
2630#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2631#else
2632#ifdef CONFIG_SMP
2633#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2634#else
2635#define KDB_PCU(cpu) 0
2636#endif
2637#endif
2638 for_each_online_cpu(cpu) {
2639 if (KDB_FLAG(CMD_INTERRUPT))
2640 return 0;
2641
2642 if (whichcpu != ~0UL && whichcpu != cpu)
2643 continue;
2644 addr = symaddr + KDB_PCU(cpu);
2645 diag = kdb_getword(&val, addr, bytesperword);
2646 if (diag) {
2647 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2648 "read, diag=%d\n", cpu, addr, diag);
2649 continue;
2650 }
2651 kdb_printf("%5d ", cpu);
2652 kdb_md_line(fmtstr, addr,
2653 bytesperword == KDB_WORD_SIZE,
2654 1, bytesperword, 1, 1, 0);
2655 }
2656#undef KDB_PCU
2657 return 0;
2658}
2659
2660/*
2661 * display help for the use of cmd | grep pattern
2662 */
2663static int kdb_grep_help(int argc, const char **argv)
2664{
2665 kdb_printf("Usage of cmd args | grep pattern:\n");
2666 kdb_printf(" Any command's output may be filtered through an ");
2667 kdb_printf("emulated 'pipe'.\n");
2668 kdb_printf(" 'grep' is just a key word.\n");
2669 kdb_printf(" The pattern may include a very limited set of "
2670 "metacharacters:\n");
2671 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2672 kdb_printf(" And if there are spaces in the pattern, you may "
2673 "quote it:\n");
2674 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2675 " or \"^pat tern$\"\n");
2676 return 0;
2677}
2678
2679/*
2680 * kdb_register_flags - This function is used to register a kernel
2681 * debugger command.
2682 * Inputs:
2683 * cmd Command name
2684 * func Function to execute the command
2685 * usage A simple usage string showing arguments
2686 * help A simple help string describing command
2687 * repeat Does the command auto repeat on enter?
2688 * Returns:
2689 * zero for success, one if a duplicate command.
2690 */
2691#define kdb_command_extend 50 /* arbitrary */
2692int kdb_register_flags(char *cmd,
2693 kdb_func_t func,
2694 char *usage,
2695 char *help,
2696 short minlen,
2697 kdb_cmdflags_t flags)
2698{
2699 int i;
2700 kdbtab_t *kp;
2701
2702 /*
2703 * Brute force method to determine duplicates
2704 */
2705 for_each_kdbcmd(kp, i) {
2706 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2707 kdb_printf("Duplicate kdb command registered: "
2708 "%s, func %p help %s\n", cmd, func, help);
2709 return 1;
2710 }
2711 }
2712
2713 /*
2714 * Insert command into first available location in table
2715 */
2716 for_each_kdbcmd(kp, i) {
2717 if (kp->cmd_name == NULL)
2718 break;
2719 }
2720
2721 if (i >= kdb_max_commands) {
2722 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2723 kdb_command_extend) * sizeof(*new), GFP_KDB);
2724 if (!new) {
2725 kdb_printf("Could not allocate new kdb_command "
2726 "table\n");
2727 return 1;
2728 }
2729 if (kdb_commands) {
2730 memcpy(new, kdb_commands,
2731 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2732 kfree(kdb_commands);
2733 }
2734 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2735 kdb_command_extend * sizeof(*new));
2736 kdb_commands = new;
2737 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2738 kdb_max_commands += kdb_command_extend;
2739 }
2740
2741 kp->cmd_name = cmd;
2742 kp->cmd_func = func;
2743 kp->cmd_usage = usage;
2744 kp->cmd_help = help;
2745 kp->cmd_minlen = minlen;
2746 kp->cmd_flags = flags;
2747
2748 return 0;
2749}
2750EXPORT_SYMBOL_GPL(kdb_register_flags);
2751
2752
2753/*
2754 * kdb_register - Compatibility register function for commands that do
2755 * not need to specify a repeat state. Equivalent to
2756 * kdb_register_flags with flags set to 0.
2757 * Inputs:
2758 * cmd Command name
2759 * func Function to execute the command
2760 * usage A simple usage string showing arguments
2761 * help A simple help string describing command
2762 * Returns:
2763 * zero for success, one if a duplicate command.
2764 */
2765int kdb_register(char *cmd,
2766 kdb_func_t func,
2767 char *usage,
2768 char *help,
2769 short minlen)
2770{
2771 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2772}
2773EXPORT_SYMBOL_GPL(kdb_register);
2774
2775/*
2776 * kdb_unregister - This function is used to unregister a kernel
2777 * debugger command. It is generally called when a module which
2778 * implements kdb commands is unloaded.
2779 * Inputs:
2780 * cmd Command name
2781 * Returns:
2782 * zero for success, one command not registered.
2783 */
2784int kdb_unregister(char *cmd)
2785{
2786 int i;
2787 kdbtab_t *kp;
2788
2789 /*
2790 * find the command.
2791 */
2792 for_each_kdbcmd(kp, i) {
2793 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2794 kp->cmd_name = NULL;
2795 return 0;
2796 }
2797 }
2798
2799 /* Couldn't find it. */
2800 return 1;
2801}
2802EXPORT_SYMBOL_GPL(kdb_unregister);
2803
2804/* Initialize the kdb command table. */
2805static void __init kdb_inittab(void)
2806{
2807 int i;
2808 kdbtab_t *kp;
2809
2810 for_each_kdbcmd(kp, i)
2811 kp->cmd_name = NULL;
2812
2813 kdb_register_flags("md", kdb_md, "<vaddr>",
2814 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2815 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2816 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2817 "Display Raw Memory", 0,
2818 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2819 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2820 "Display Physical Memory", 0,
2821 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2822 kdb_register_flags("mds", kdb_md, "<vaddr>",
2823 "Display Memory Symbolically", 0,
2824 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2825 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2826 "Modify Memory Contents", 0,
2827 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2828 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2829 "Continue Execution", 1,
2830 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2831 kdb_register_flags("rd", kdb_rd, "",
2832 "Display Registers", 0,
2833 KDB_ENABLE_REG_READ);
2834 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2835 "Modify Registers", 0,
2836 KDB_ENABLE_REG_WRITE);
2837 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2838 "Display exception frame", 0,
2839 KDB_ENABLE_MEM_READ);
2840 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2841 "Stack traceback", 1,
2842 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2843 kdb_register_flags("btp", kdb_bt, "<pid>",
2844 "Display stack for process <pid>", 0,
2845 KDB_ENABLE_INSPECT);
2846 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2847 "Backtrace all processes matching state flag", 0,
2848 KDB_ENABLE_INSPECT);
2849 kdb_register_flags("btc", kdb_bt, "",
2850 "Backtrace current process on each cpu", 0,
2851 KDB_ENABLE_INSPECT);
2852 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2853 "Backtrace process given its struct task address", 0,
2854 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2855 kdb_register_flags("env", kdb_env, "",
2856 "Show environment variables", 0,
2857 KDB_ENABLE_ALWAYS_SAFE);
2858 kdb_register_flags("set", kdb_set, "",
2859 "Set environment variables", 0,
2860 KDB_ENABLE_ALWAYS_SAFE);
2861 kdb_register_flags("help", kdb_help, "",
2862 "Display Help Message", 1,
2863 KDB_ENABLE_ALWAYS_SAFE);
2864 kdb_register_flags("?", kdb_help, "",
2865 "Display Help Message", 0,
2866 KDB_ENABLE_ALWAYS_SAFE);
2867 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2868 "Switch to new cpu", 0,
2869 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2870 kdb_register_flags("kgdb", kdb_kgdb, "",
2871 "Enter kgdb mode", 0, 0);
2872 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2873 "Display active task list", 0,
2874 KDB_ENABLE_INSPECT);
2875 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2876 "Switch to another task", 0,
2877 KDB_ENABLE_INSPECT);
2878 kdb_register_flags("reboot", kdb_reboot, "",
2879 "Reboot the machine immediately", 0,
2880 KDB_ENABLE_REBOOT);
2881#if defined(CONFIG_MODULES)
2882 kdb_register_flags("lsmod", kdb_lsmod, "",
2883 "List loaded kernel modules", 0,
2884 KDB_ENABLE_INSPECT);
2885#endif
2886#if defined(CONFIG_MAGIC_SYSRQ)
2887 kdb_register_flags("sr", kdb_sr, "<key>",
2888 "Magic SysRq key", 0,
2889 KDB_ENABLE_ALWAYS_SAFE);
2890#endif
2891#if defined(CONFIG_PRINTK)
2892 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2893 "Display syslog buffer", 0,
2894 KDB_ENABLE_ALWAYS_SAFE);
2895#endif
2896 if (arch_kgdb_ops.enable_nmi) {
2897 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2898 "Disable NMI entry to KDB", 0,
2899 KDB_ENABLE_ALWAYS_SAFE);
2900 }
2901 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2902 "Define a set of commands, down to endefcmd", 0,
2903 KDB_ENABLE_ALWAYS_SAFE);
2904 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2905 "Send a signal to a process", 0,
2906 KDB_ENABLE_SIGNAL);
2907 kdb_register_flags("summary", kdb_summary, "",
2908 "Summarize the system", 4,
2909 KDB_ENABLE_ALWAYS_SAFE);
2910 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2911 "Display per_cpu variables", 3,
2912 KDB_ENABLE_MEM_READ);
2913 kdb_register_flags("grephelp", kdb_grep_help, "",
2914 "Display help on | grep", 0,
2915 KDB_ENABLE_ALWAYS_SAFE);
2916}
2917
2918/* Execute any commands defined in kdb_cmds. */
2919static void __init kdb_cmd_init(void)
2920{
2921 int i, diag;
2922 for (i = 0; kdb_cmds[i]; ++i) {
2923 diag = kdb_parse(kdb_cmds[i]);
2924 if (diag)
2925 kdb_printf("kdb command %s failed, kdb diag %d\n",
2926 kdb_cmds[i], diag);
2927 }
2928 if (defcmd_in_progress) {
2929 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2930 kdb_parse("endefcmd");
2931 }
2932}
2933
2934/* Initialize kdb_printf, breakpoint tables and kdb state */
2935void __init kdb_init(int lvl)
2936{
2937 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2938 int i;
2939
2940 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2941 return;
2942 for (i = kdb_init_lvl; i < lvl; i++) {
2943 switch (i) {
2944 case KDB_NOT_INITIALIZED:
2945 kdb_inittab(); /* Initialize Command Table */
2946 kdb_initbptab(); /* Initialize Breakpoints */
2947 break;
2948 case KDB_INIT_EARLY:
2949 kdb_cmd_init(); /* Build kdb_cmds tables */
2950 break;
2951 }
2952 }
2953 kdb_init_lvl = lvl;
2954}
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/reboot.h>
18#include <linux/sched.h>
19#include <linux/sysrq.h>
20#include <linux/smp.h>
21#include <linux/utsname.h>
22#include <linux/vmalloc.h>
23#include <linux/module.h>
24#include <linux/mm.h>
25#include <linux/init.h>
26#include <linux/kallsyms.h>
27#include <linux/kgdb.h>
28#include <linux/kdb.h>
29#include <linux/notifier.h>
30#include <linux/interrupt.h>
31#include <linux/delay.h>
32#include <linux/nmi.h>
33#include <linux/time.h>
34#include <linux/ptrace.h>
35#include <linux/sysctl.h>
36#include <linux/cpu.h>
37#include <linux/kdebug.h>
38#include <linux/proc_fs.h>
39#include <linux/uaccess.h>
40#include <linux/slab.h>
41#include "kdb_private.h"
42
43#define GREP_LEN 256
44char kdb_grep_string[GREP_LEN];
45int kdb_grepping_flag;
46EXPORT_SYMBOL(kdb_grepping_flag);
47int kdb_grep_leading;
48int kdb_grep_trailing;
49
50/*
51 * Kernel debugger state flags
52 */
53int kdb_flags;
54atomic_t kdb_event;
55
56/*
57 * kdb_lock protects updates to kdb_initial_cpu. Used to
58 * single thread processors through the kernel debugger.
59 */
60int kdb_initial_cpu = -1; /* cpu number that owns kdb */
61int kdb_nextline = 1;
62int kdb_state; /* General KDB state */
63
64struct task_struct *kdb_current_task;
65EXPORT_SYMBOL(kdb_current_task);
66struct pt_regs *kdb_current_regs;
67
68const char *kdb_diemsg;
69static int kdb_go_count;
70#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
71static unsigned int kdb_continue_catastrophic =
72 CONFIG_KDB_CONTINUE_CATASTROPHIC;
73#else
74static unsigned int kdb_continue_catastrophic;
75#endif
76
77/* kdb_commands describes the available commands. */
78static kdbtab_t *kdb_commands;
79#define KDB_BASE_CMD_MAX 50
80static int kdb_max_commands = KDB_BASE_CMD_MAX;
81static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
82#define for_each_kdbcmd(cmd, num) \
83 for ((cmd) = kdb_base_commands, (num) = 0; \
84 num < kdb_max_commands; \
85 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
86
87typedef struct _kdbmsg {
88 int km_diag; /* kdb diagnostic */
89 char *km_msg; /* Corresponding message text */
90} kdbmsg_t;
91
92#define KDBMSG(msgnum, text) \
93 { KDB_##msgnum, text }
94
95static kdbmsg_t kdbmsgs[] = {
96 KDBMSG(NOTFOUND, "Command Not Found"),
97 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
98 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
99 "8 is only allowed on 64 bit systems"),
100 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
101 KDBMSG(NOTENV, "Cannot find environment variable"),
102 KDBMSG(NOENVVALUE, "Environment variable should have value"),
103 KDBMSG(NOTIMP, "Command not implemented"),
104 KDBMSG(ENVFULL, "Environment full"),
105 KDBMSG(ENVBUFFULL, "Environment buffer full"),
106 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
107#ifdef CONFIG_CPU_XSCALE
108 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
109#else
110 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
111#endif
112 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
113 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
114 KDBMSG(BADMODE, "Invalid IDMODE"),
115 KDBMSG(BADINT, "Illegal numeric value"),
116 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
117 KDBMSG(BADREG, "Invalid register name"),
118 KDBMSG(BADCPUNUM, "Invalid cpu number"),
119 KDBMSG(BADLENGTH, "Invalid length field"),
120 KDBMSG(NOBP, "No Breakpoint exists"),
121 KDBMSG(BADADDR, "Invalid address"),
122};
123#undef KDBMSG
124
125static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t);
126
127
128/*
129 * Initial environment. This is all kept static and local to
130 * this file. We don't want to rely on the memory allocation
131 * mechanisms in the kernel, so we use a very limited allocate-only
132 * heap for new and altered environment variables. The entire
133 * environment is limited to a fixed number of entries (add more
134 * to __env[] if required) and a fixed amount of heap (add more to
135 * KDB_ENVBUFSIZE if required).
136 */
137
138static char *__env[] = {
139#if defined(CONFIG_SMP)
140 "PROMPT=[%d]kdb> ",
141 "MOREPROMPT=[%d]more> ",
142#else
143 "PROMPT=kdb> ",
144 "MOREPROMPT=more> ",
145#endif
146 "RADIX=16",
147 "MDCOUNT=8", /* lines of md output */
148 KDB_PLATFORM_ENV,
149 "DTABCOUNT=30",
150 "NOSECT=1",
151 (char *)0,
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};
176
177static const int __nenv = (sizeof(__env) / sizeof(char *));
178
179struct task_struct *kdb_curr_task(int cpu)
180{
181 struct task_struct *p = curr_task(cpu);
182#ifdef _TIF_MCA_INIT
183 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
184 p = krp->p;
185#endif
186 return p;
187}
188
189/*
190 * kdbgetenv - This function will return the character string value of
191 * an environment variable.
192 * Parameters:
193 * match A character string representing an environment variable.
194 * Returns:
195 * NULL No environment variable matches 'match'
196 * char* Pointer to string value of environment variable.
197 */
198char *kdbgetenv(const char *match)
199{
200 char **ep = __env;
201 int matchlen = strlen(match);
202 int i;
203
204 for (i = 0; i < __nenv; i++) {
205 char *e = *ep++;
206
207 if (!e)
208 continue;
209
210 if ((strncmp(match, e, matchlen) == 0)
211 && ((e[matchlen] == '\0')
212 || (e[matchlen] == '='))) {
213 char *cp = strchr(e, '=');
214 return cp ? ++cp : "";
215 }
216 }
217 return NULL;
218}
219
220/*
221 * kdballocenv - This function is used to allocate bytes for
222 * environment entries.
223 * Parameters:
224 * match A character string representing a numeric value
225 * Outputs:
226 * *value the unsigned long representation of the env variable 'match'
227 * Returns:
228 * Zero on success, a kdb diagnostic on failure.
229 * Remarks:
230 * We use a static environment buffer (envbuffer) to hold the values
231 * of dynamically generated environment variables (see kdb_set). Buffer
232 * space once allocated is never free'd, so over time, the amount of space
233 * (currently 512 bytes) will be exhausted if env variables are changed
234 * frequently.
235 */
236static char *kdballocenv(size_t bytes)
237{
238#define KDB_ENVBUFSIZE 512
239 static char envbuffer[KDB_ENVBUFSIZE];
240 static int envbufsize;
241 char *ep = NULL;
242
243 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
244 ep = &envbuffer[envbufsize];
245 envbufsize += bytes;
246 }
247 return ep;
248}
249
250/*
251 * kdbgetulenv - This function will return the value of an unsigned
252 * long-valued environment variable.
253 * Parameters:
254 * match A character string representing a numeric value
255 * Outputs:
256 * *value the unsigned long represntation of the env variable 'match'
257 * Returns:
258 * Zero on success, a kdb diagnostic on failure.
259 */
260static int kdbgetulenv(const char *match, unsigned long *value)
261{
262 char *ep;
263
264 ep = kdbgetenv(match);
265 if (!ep)
266 return KDB_NOTENV;
267 if (strlen(ep) == 0)
268 return KDB_NOENVVALUE;
269
270 *value = simple_strtoul(ep, NULL, 0);
271
272 return 0;
273}
274
275/*
276 * kdbgetintenv - This function will return the value of an
277 * integer-valued environment variable.
278 * Parameters:
279 * match A character string representing an integer-valued env variable
280 * Outputs:
281 * *value the integer representation of the environment variable 'match'
282 * Returns:
283 * Zero on success, a kdb diagnostic on failure.
284 */
285int kdbgetintenv(const char *match, int *value)
286{
287 unsigned long val;
288 int diag;
289
290 diag = kdbgetulenv(match, &val);
291 if (!diag)
292 *value = (int) val;
293 return diag;
294}
295
296/*
297 * kdbgetularg - This function will convert a numeric string into an
298 * unsigned long value.
299 * Parameters:
300 * arg A character string representing a numeric value
301 * Outputs:
302 * *value the unsigned long represntation of arg.
303 * Returns:
304 * Zero on success, a kdb diagnostic on failure.
305 */
306int kdbgetularg(const char *arg, unsigned long *value)
307{
308 char *endp;
309 unsigned long val;
310
311 val = simple_strtoul(arg, &endp, 0);
312
313 if (endp == arg) {
314 /*
315 * Also try base 16, for us folks too lazy to type the
316 * leading 0x...
317 */
318 val = simple_strtoul(arg, &endp, 16);
319 if (endp == arg)
320 return KDB_BADINT;
321 }
322
323 *value = val;
324
325 return 0;
326}
327
328int kdbgetu64arg(const char *arg, u64 *value)
329{
330 char *endp;
331 u64 val;
332
333 val = simple_strtoull(arg, &endp, 0);
334
335 if (endp == arg) {
336
337 val = simple_strtoull(arg, &endp, 16);
338 if (endp == arg)
339 return KDB_BADINT;
340 }
341
342 *value = val;
343
344 return 0;
345}
346
347/*
348 * kdb_set - This function implements the 'set' command. Alter an
349 * existing environment variable or create a new one.
350 */
351int kdb_set(int argc, const char **argv)
352{
353 int i;
354 char *ep;
355 size_t varlen, vallen;
356
357 /*
358 * we can be invoked two ways:
359 * set var=value argv[1]="var", argv[2]="value"
360 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
361 * - if the latter, shift 'em down.
362 */
363 if (argc == 3) {
364 argv[2] = argv[3];
365 argc--;
366 }
367
368 if (argc != 2)
369 return KDB_ARGCOUNT;
370
371 /*
372 * Check for internal variables
373 */
374 if (strcmp(argv[1], "KDBDEBUG") == 0) {
375 unsigned int debugflags;
376 char *cp;
377
378 debugflags = simple_strtoul(argv[2], &cp, 0);
379 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
380 kdb_printf("kdb: illegal debug flags '%s'\n",
381 argv[2]);
382 return 0;
383 }
384 kdb_flags = (kdb_flags &
385 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
386 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
387
388 return 0;
389 }
390
391 /*
392 * Tokenizer squashed the '=' sign. argv[1] is variable
393 * name, argv[2] = value.
394 */
395 varlen = strlen(argv[1]);
396 vallen = strlen(argv[2]);
397 ep = kdballocenv(varlen + vallen + 2);
398 if (ep == (char *)0)
399 return KDB_ENVBUFFULL;
400
401 sprintf(ep, "%s=%s", argv[1], argv[2]);
402
403 ep[varlen+vallen+1] = '\0';
404
405 for (i = 0; i < __nenv; i++) {
406 if (__env[i]
407 && ((strncmp(__env[i], argv[1], varlen) == 0)
408 && ((__env[i][varlen] == '\0')
409 || (__env[i][varlen] == '=')))) {
410 __env[i] = ep;
411 return 0;
412 }
413 }
414
415 /*
416 * Wasn't existing variable. Fit into slot.
417 */
418 for (i = 0; i < __nenv-1; i++) {
419 if (__env[i] == (char *)0) {
420 __env[i] = ep;
421 return 0;
422 }
423 }
424
425 return KDB_ENVFULL;
426}
427
428static int kdb_check_regs(void)
429{
430 if (!kdb_current_regs) {
431 kdb_printf("No current kdb registers."
432 " You may need to select another task\n");
433 return KDB_BADREG;
434 }
435 return 0;
436}
437
438/*
439 * kdbgetaddrarg - This function is responsible for parsing an
440 * address-expression and returning the value of the expression,
441 * symbol name, and offset to the caller.
442 *
443 * The argument may consist of a numeric value (decimal or
444 * hexidecimal), a symbol name, a register name (preceded by the
445 * percent sign), an environment variable with a numeric value
446 * (preceded by a dollar sign) or a simple arithmetic expression
447 * consisting of a symbol name, +/-, and a numeric constant value
448 * (offset).
449 * Parameters:
450 * argc - count of arguments in argv
451 * argv - argument vector
452 * *nextarg - index to next unparsed argument in argv[]
453 * regs - Register state at time of KDB entry
454 * Outputs:
455 * *value - receives the value of the address-expression
456 * *offset - receives the offset specified, if any
457 * *name - receives the symbol name, if any
458 * *nextarg - index to next unparsed argument in argv[]
459 * Returns:
460 * zero is returned on success, a kdb diagnostic code is
461 * returned on error.
462 */
463int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
464 unsigned long *value, long *offset,
465 char **name)
466{
467 unsigned long addr;
468 unsigned long off = 0;
469 int positive;
470 int diag;
471 int found = 0;
472 char *symname;
473 char symbol = '\0';
474 char *cp;
475 kdb_symtab_t symtab;
476
477 /*
478 * Process arguments which follow the following syntax:
479 *
480 * symbol | numeric-address [+/- numeric-offset]
481 * %register
482 * $environment-variable
483 */
484
485 if (*nextarg > argc)
486 return KDB_ARGCOUNT;
487
488 symname = (char *)argv[*nextarg];
489
490 /*
491 * If there is no whitespace between the symbol
492 * or address and the '+' or '-' symbols, we
493 * remember the character and replace it with a
494 * null so the symbol/value can be properly parsed
495 */
496 cp = strpbrk(symname, "+-");
497 if (cp != NULL) {
498 symbol = *cp;
499 *cp++ = '\0';
500 }
501
502 if (symname[0] == '$') {
503 diag = kdbgetulenv(&symname[1], &addr);
504 if (diag)
505 return diag;
506 } else if (symname[0] == '%') {
507 diag = kdb_check_regs();
508 if (diag)
509 return diag;
510 /* Implement register values with % at a later time as it is
511 * arch optional.
512 */
513 return KDB_NOTIMP;
514 } else {
515 found = kdbgetsymval(symname, &symtab);
516 if (found) {
517 addr = symtab.sym_start;
518 } else {
519 diag = kdbgetularg(argv[*nextarg], &addr);
520 if (diag)
521 return diag;
522 }
523 }
524
525 if (!found)
526 found = kdbnearsym(addr, &symtab);
527
528 (*nextarg)++;
529
530 if (name)
531 *name = symname;
532 if (value)
533 *value = addr;
534 if (offset && name && *name)
535 *offset = addr - symtab.sym_start;
536
537 if ((*nextarg > argc)
538 && (symbol == '\0'))
539 return 0;
540
541 /*
542 * check for +/- and offset
543 */
544
545 if (symbol == '\0') {
546 if ((argv[*nextarg][0] != '+')
547 && (argv[*nextarg][0] != '-')) {
548 /*
549 * Not our argument. Return.
550 */
551 return 0;
552 } else {
553 positive = (argv[*nextarg][0] == '+');
554 (*nextarg)++;
555 }
556 } else
557 positive = (symbol == '+');
558
559 /*
560 * Now there must be an offset!
561 */
562 if ((*nextarg > argc)
563 && (symbol == '\0')) {
564 return KDB_INVADDRFMT;
565 }
566
567 if (!symbol) {
568 cp = (char *)argv[*nextarg];
569 (*nextarg)++;
570 }
571
572 diag = kdbgetularg(cp, &off);
573 if (diag)
574 return diag;
575
576 if (!positive)
577 off = -off;
578
579 if (offset)
580 *offset += off;
581
582 if (value)
583 *value += off;
584
585 return 0;
586}
587
588static void kdb_cmderror(int diag)
589{
590 int i;
591
592 if (diag >= 0) {
593 kdb_printf("no error detected (diagnostic is %d)\n", diag);
594 return;
595 }
596
597 for (i = 0; i < __nkdb_err; i++) {
598 if (kdbmsgs[i].km_diag == diag) {
599 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
600 return;
601 }
602 }
603
604 kdb_printf("Unknown diag %d\n", -diag);
605}
606
607/*
608 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
609 * command which defines one command as a set of other commands,
610 * terminated by endefcmd. kdb_defcmd processes the initial
611 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
612 * the following commands until 'endefcmd'.
613 * Inputs:
614 * argc argument count
615 * argv argument vector
616 * Returns:
617 * zero for success, a kdb diagnostic if error
618 */
619struct defcmd_set {
620 int count;
621 int usable;
622 char *name;
623 char *usage;
624 char *help;
625 char **command;
626};
627static struct defcmd_set *defcmd_set;
628static int defcmd_set_count;
629static int defcmd_in_progress;
630
631/* Forward references */
632static int kdb_exec_defcmd(int argc, const char **argv);
633
634static int kdb_defcmd2(const char *cmdstr, const char *argv0)
635{
636 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
637 char **save_command = s->command;
638 if (strcmp(argv0, "endefcmd") == 0) {
639 defcmd_in_progress = 0;
640 if (!s->count)
641 s->usable = 0;
642 if (s->usable)
643 kdb_register(s->name, kdb_exec_defcmd,
644 s->usage, s->help, 0);
645 return 0;
646 }
647 if (!s->usable)
648 return KDB_NOTIMP;
649 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
650 if (!s->command) {
651 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
652 cmdstr);
653 s->usable = 0;
654 return KDB_NOTIMP;
655 }
656 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
657 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
658 kfree(save_command);
659 return 0;
660}
661
662static int kdb_defcmd(int argc, const char **argv)
663{
664 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
665 if (defcmd_in_progress) {
666 kdb_printf("kdb: nested defcmd detected, assuming missing "
667 "endefcmd\n");
668 kdb_defcmd2("endefcmd", "endefcmd");
669 }
670 if (argc == 0) {
671 int i;
672 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
673 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
674 s->usage, s->help);
675 for (i = 0; i < s->count; ++i)
676 kdb_printf("%s", s->command[i]);
677 kdb_printf("endefcmd\n");
678 }
679 return 0;
680 }
681 if (argc != 3)
682 return KDB_ARGCOUNT;
683 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
684 GFP_KDB);
685 if (!defcmd_set) {
686 kdb_printf("Could not allocate new defcmd_set entry for %s\n",
687 argv[1]);
688 defcmd_set = save_defcmd_set;
689 return KDB_NOTIMP;
690 }
691 memcpy(defcmd_set, save_defcmd_set,
692 defcmd_set_count * sizeof(*defcmd_set));
693 kfree(save_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 s->usage = kdb_strdup(argv[2], GFP_KDB);
699 s->help = kdb_strdup(argv[3], GFP_KDB);
700 if (s->usage[0] == '"') {
701 strcpy(s->usage, s->usage+1);
702 s->usage[strlen(s->usage)-1] = '\0';
703 }
704 if (s->help[0] == '"') {
705 strcpy(s->help, s->help+1);
706 s->help[strlen(s->help)-1] = '\0';
707 }
708 ++defcmd_set_count;
709 defcmd_in_progress = 1;
710 return 0;
711}
712
713/*
714 * kdb_exec_defcmd - Execute the set of commands associated with this
715 * defcmd name.
716 * Inputs:
717 * argc argument count
718 * argv argument vector
719 * Returns:
720 * zero for success, a kdb diagnostic if error
721 */
722static int kdb_exec_defcmd(int argc, const char **argv)
723{
724 int i, ret;
725 struct defcmd_set *s;
726 if (argc != 0)
727 return KDB_ARGCOUNT;
728 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
729 if (strcmp(s->name, argv[0]) == 0)
730 break;
731 }
732 if (i == defcmd_set_count) {
733 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
734 argv[0]);
735 return KDB_NOTIMP;
736 }
737 for (i = 0; i < s->count; ++i) {
738 /* Recursive use of kdb_parse, do not use argv after
739 * this point */
740 argv = NULL;
741 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
742 ret = kdb_parse(s->command[i]);
743 if (ret)
744 return ret;
745 }
746 return 0;
747}
748
749/* Command history */
750#define KDB_CMD_HISTORY_COUNT 32
751#define CMD_BUFLEN 200 /* kdb_printf: max printline
752 * size == 256 */
753static unsigned int cmd_head, cmd_tail;
754static unsigned int cmdptr;
755static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
756static char cmd_cur[CMD_BUFLEN];
757
758/*
759 * The "str" argument may point to something like | grep xyz
760 */
761static void parse_grep(const char *str)
762{
763 int len;
764 char *cp = (char *)str, *cp2;
765
766 /* sanity check: we should have been called with the \ first */
767 if (*cp != '|')
768 return;
769 cp++;
770 while (isspace(*cp))
771 cp++;
772 if (strncmp(cp, "grep ", 5)) {
773 kdb_printf("invalid 'pipe', see grephelp\n");
774 return;
775 }
776 cp += 5;
777 while (isspace(*cp))
778 cp++;
779 cp2 = strchr(cp, '\n');
780 if (cp2)
781 *cp2 = '\0'; /* remove the trailing newline */
782 len = strlen(cp);
783 if (len == 0) {
784 kdb_printf("invalid 'pipe', see grephelp\n");
785 return;
786 }
787 /* now cp points to a nonzero length search string */
788 if (*cp == '"') {
789 /* allow it be "x y z" by removing the "'s - there must
790 be two of them */
791 cp++;
792 cp2 = strchr(cp, '"');
793 if (!cp2) {
794 kdb_printf("invalid quoted string, see grephelp\n");
795 return;
796 }
797 *cp2 = '\0'; /* end the string where the 2nd " was */
798 }
799 kdb_grep_leading = 0;
800 if (*cp == '^') {
801 kdb_grep_leading = 1;
802 cp++;
803 }
804 len = strlen(cp);
805 kdb_grep_trailing = 0;
806 if (*(cp+len-1) == '$') {
807 kdb_grep_trailing = 1;
808 *(cp+len-1) = '\0';
809 }
810 len = strlen(cp);
811 if (!len)
812 return;
813 if (len >= GREP_LEN) {
814 kdb_printf("search string too long\n");
815 return;
816 }
817 strcpy(kdb_grep_string, cp);
818 kdb_grepping_flag++;
819 return;
820}
821
822/*
823 * kdb_parse - Parse the command line, search the command table for a
824 * matching command and invoke the command function. This
825 * function may be called recursively, if it is, the second call
826 * will overwrite argv and cbuf. It is the caller's
827 * responsibility to save their argv if they recursively call
828 * kdb_parse().
829 * Parameters:
830 * cmdstr The input command line to be parsed.
831 * regs The registers at the time kdb was entered.
832 * Returns:
833 * Zero for success, a kdb diagnostic if failure.
834 * Remarks:
835 * Limited to 20 tokens.
836 *
837 * Real rudimentary tokenization. Basically only whitespace
838 * is considered a token delimeter (but special consideration
839 * is taken of the '=' sign as used by the 'set' command).
840 *
841 * The algorithm used to tokenize the input string relies on
842 * there being at least one whitespace (or otherwise useless)
843 * character between tokens as the character immediately following
844 * the token is altered in-place to a null-byte to terminate the
845 * token string.
846 */
847
848#define MAXARGC 20
849
850int kdb_parse(const char *cmdstr)
851{
852 static char *argv[MAXARGC];
853 static int argc;
854 static char cbuf[CMD_BUFLEN+2];
855 char *cp;
856 char *cpp, quoted;
857 kdbtab_t *tp;
858 int i, escaped, ignore_errors = 0, check_grep;
859
860 /*
861 * First tokenize the command string.
862 */
863 cp = (char *)cmdstr;
864 kdb_grepping_flag = check_grep = 0;
865
866 if (KDB_FLAG(CMD_INTERRUPT)) {
867 /* Previous command was interrupted, newline must not
868 * repeat the command */
869 KDB_FLAG_CLEAR(CMD_INTERRUPT);
870 KDB_STATE_SET(PAGER);
871 argc = 0; /* no repeat */
872 }
873
874 if (*cp != '\n' && *cp != '\0') {
875 argc = 0;
876 cpp = cbuf;
877 while (*cp) {
878 /* skip whitespace */
879 while (isspace(*cp))
880 cp++;
881 if ((*cp == '\0') || (*cp == '\n') ||
882 (*cp == '#' && !defcmd_in_progress))
883 break;
884 /* special case: check for | grep pattern */
885 if (*cp == '|') {
886 check_grep++;
887 break;
888 }
889 if (cpp >= cbuf + CMD_BUFLEN) {
890 kdb_printf("kdb_parse: command buffer "
891 "overflow, command ignored\n%s\n",
892 cmdstr);
893 return KDB_NOTFOUND;
894 }
895 if (argc >= MAXARGC - 1) {
896 kdb_printf("kdb_parse: too many arguments, "
897 "command ignored\n%s\n", cmdstr);
898 return KDB_NOTFOUND;
899 }
900 argv[argc++] = cpp;
901 escaped = 0;
902 quoted = '\0';
903 /* Copy to next unquoted and unescaped
904 * whitespace or '=' */
905 while (*cp && *cp != '\n' &&
906 (escaped || quoted || !isspace(*cp))) {
907 if (cpp >= cbuf + CMD_BUFLEN)
908 break;
909 if (escaped) {
910 escaped = 0;
911 *cpp++ = *cp++;
912 continue;
913 }
914 if (*cp == '\\') {
915 escaped = 1;
916 ++cp;
917 continue;
918 }
919 if (*cp == quoted)
920 quoted = '\0';
921 else if (*cp == '\'' || *cp == '"')
922 quoted = *cp;
923 *cpp = *cp++;
924 if (*cpp == '=' && !quoted)
925 break;
926 ++cpp;
927 }
928 *cpp++ = '\0'; /* Squash a ws or '=' character */
929 }
930 }
931 if (!argc)
932 return 0;
933 if (check_grep)
934 parse_grep(cp);
935 if (defcmd_in_progress) {
936 int result = kdb_defcmd2(cmdstr, argv[0]);
937 if (!defcmd_in_progress) {
938 argc = 0; /* avoid repeat on endefcmd */
939 *(argv[0]) = '\0';
940 }
941 return result;
942 }
943 if (argv[0][0] == '-' && argv[0][1] &&
944 (argv[0][1] < '0' || argv[0][1] > '9')) {
945 ignore_errors = 1;
946 ++argv[0];
947 }
948
949 for_each_kdbcmd(tp, i) {
950 if (tp->cmd_name) {
951 /*
952 * If this command is allowed to be abbreviated,
953 * check to see if this is it.
954 */
955
956 if (tp->cmd_minlen
957 && (strlen(argv[0]) <= tp->cmd_minlen)) {
958 if (strncmp(argv[0],
959 tp->cmd_name,
960 tp->cmd_minlen) == 0) {
961 break;
962 }
963 }
964
965 if (strcmp(argv[0], tp->cmd_name) == 0)
966 break;
967 }
968 }
969
970 /*
971 * If we don't find a command by this name, see if the first
972 * few characters of this match any of the known commands.
973 * e.g., md1c20 should match md.
974 */
975 if (i == kdb_max_commands) {
976 for_each_kdbcmd(tp, i) {
977 if (tp->cmd_name) {
978 if (strncmp(argv[0],
979 tp->cmd_name,
980 strlen(tp->cmd_name)) == 0) {
981 break;
982 }
983 }
984 }
985 }
986
987 if (i < kdb_max_commands) {
988 int result;
989 KDB_STATE_SET(CMD);
990 result = (*tp->cmd_func)(argc-1, (const char **)argv);
991 if (result && ignore_errors && result > KDB_CMD_GO)
992 result = 0;
993 KDB_STATE_CLEAR(CMD);
994 switch (tp->cmd_repeat) {
995 case KDB_REPEAT_NONE:
996 argc = 0;
997 if (argv[0])
998 *(argv[0]) = '\0';
999 break;
1000 case KDB_REPEAT_NO_ARGS:
1001 argc = 1;
1002 if (argv[1])
1003 *(argv[1]) = '\0';
1004 break;
1005 case KDB_REPEAT_WITH_ARGS:
1006 break;
1007 }
1008 return result;
1009 }
1010
1011 /*
1012 * If the input with which we were presented does not
1013 * map to an existing command, attempt to parse it as an
1014 * address argument and display the result. Useful for
1015 * obtaining the address of a variable, or the nearest symbol
1016 * to an address contained in a register.
1017 */
1018 {
1019 unsigned long value;
1020 char *name = NULL;
1021 long offset;
1022 int nextarg = 0;
1023
1024 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1025 &value, &offset, &name)) {
1026 return KDB_NOTFOUND;
1027 }
1028
1029 kdb_printf("%s = ", argv[0]);
1030 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1031 kdb_printf("\n");
1032 return 0;
1033 }
1034}
1035
1036
1037static int handle_ctrl_cmd(char *cmd)
1038{
1039#define CTRL_P 16
1040#define CTRL_N 14
1041
1042 /* initial situation */
1043 if (cmd_head == cmd_tail)
1044 return 0;
1045 switch (*cmd) {
1046 case CTRL_P:
1047 if (cmdptr != cmd_tail)
1048 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1049 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1050 return 1;
1051 case CTRL_N:
1052 if (cmdptr != cmd_head)
1053 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1054 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1055 return 1;
1056 }
1057 return 0;
1058}
1059
1060/*
1061 * kdb_reboot - This function implements the 'reboot' command. Reboot
1062 * the system immediately, or loop for ever on failure.
1063 */
1064static int kdb_reboot(int argc, const char **argv)
1065{
1066 emergency_restart();
1067 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1068 while (1)
1069 cpu_relax();
1070 /* NOTREACHED */
1071 return 0;
1072}
1073
1074static void kdb_dumpregs(struct pt_regs *regs)
1075{
1076 int old_lvl = console_loglevel;
1077 console_loglevel = 15;
1078 kdb_trap_printk++;
1079 show_regs(regs);
1080 kdb_trap_printk--;
1081 kdb_printf("\n");
1082 console_loglevel = old_lvl;
1083}
1084
1085void kdb_set_current_task(struct task_struct *p)
1086{
1087 kdb_current_task = p;
1088
1089 if (kdb_task_has_cpu(p)) {
1090 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1091 return;
1092 }
1093 kdb_current_regs = NULL;
1094}
1095
1096/*
1097 * kdb_local - The main code for kdb. This routine is invoked on a
1098 * specific processor, it is not global. The main kdb() routine
1099 * ensures that only one processor at a time is in this routine.
1100 * This code is called with the real reason code on the first
1101 * entry to a kdb session, thereafter it is called with reason
1102 * SWITCH, even if the user goes back to the original cpu.
1103 * Inputs:
1104 * reason The reason KDB was invoked
1105 * error The hardware-defined error code
1106 * regs The exception frame at time of fault/breakpoint.
1107 * db_result Result code from the break or debug point.
1108 * Returns:
1109 * 0 KDB was invoked for an event which it wasn't responsible
1110 * 1 KDB handled the event for which it was invoked.
1111 * KDB_CMD_GO User typed 'go'.
1112 * KDB_CMD_CPU User switched to another cpu.
1113 * KDB_CMD_SS Single step.
1114 * KDB_CMD_SSB Single step until branch.
1115 */
1116static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1117 kdb_dbtrap_t db_result)
1118{
1119 char *cmdbuf;
1120 int diag;
1121 struct task_struct *kdb_current =
1122 kdb_curr_task(raw_smp_processor_id());
1123
1124 KDB_DEBUG_STATE("kdb_local 1", reason);
1125 kdb_go_count = 0;
1126 if (reason == KDB_REASON_DEBUG) {
1127 /* special case below */
1128 } else {
1129 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1130 kdb_current, kdb_current ? kdb_current->pid : 0);
1131#if defined(CONFIG_SMP)
1132 kdb_printf("on processor %d ", raw_smp_processor_id());
1133#endif
1134 }
1135
1136 switch (reason) {
1137 case KDB_REASON_DEBUG:
1138 {
1139 /*
1140 * If re-entering kdb after a single step
1141 * command, don't print the message.
1142 */
1143 switch (db_result) {
1144 case KDB_DB_BPT:
1145 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1146 kdb_current, kdb_current->pid);
1147#if defined(CONFIG_SMP)
1148 kdb_printf("on processor %d ", raw_smp_processor_id());
1149#endif
1150 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1151 instruction_pointer(regs));
1152 break;
1153 case KDB_DB_SSB:
1154 /*
1155 * In the midst of ssb command. Just return.
1156 */
1157 KDB_DEBUG_STATE("kdb_local 3", reason);
1158 return KDB_CMD_SSB; /* Continue with SSB command */
1159
1160 break;
1161 case KDB_DB_SS:
1162 break;
1163 case KDB_DB_SSBPT:
1164 KDB_DEBUG_STATE("kdb_local 4", reason);
1165 return 1; /* kdba_db_trap did the work */
1166 default:
1167 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1168 db_result);
1169 break;
1170 }
1171
1172 }
1173 break;
1174 case KDB_REASON_ENTER:
1175 if (KDB_STATE(KEYBOARD))
1176 kdb_printf("due to Keyboard Entry\n");
1177 else
1178 kdb_printf("due to KDB_ENTER()\n");
1179 break;
1180 case KDB_REASON_KEYBOARD:
1181 KDB_STATE_SET(KEYBOARD);
1182 kdb_printf("due to Keyboard Entry\n");
1183 break;
1184 case KDB_REASON_ENTER_SLAVE:
1185 /* drop through, slaves only get released via cpu switch */
1186 case KDB_REASON_SWITCH:
1187 kdb_printf("due to cpu switch\n");
1188 break;
1189 case KDB_REASON_OOPS:
1190 kdb_printf("Oops: %s\n", kdb_diemsg);
1191 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1192 instruction_pointer(regs));
1193 kdb_dumpregs(regs);
1194 break;
1195 case KDB_REASON_NMI:
1196 kdb_printf("due to NonMaskable Interrupt @ "
1197 kdb_machreg_fmt "\n",
1198 instruction_pointer(regs));
1199 kdb_dumpregs(regs);
1200 break;
1201 case KDB_REASON_SSTEP:
1202 case KDB_REASON_BREAK:
1203 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1204 reason == KDB_REASON_BREAK ?
1205 "Breakpoint" : "SS trap", instruction_pointer(regs));
1206 /*
1207 * Determine if this breakpoint is one that we
1208 * are interested in.
1209 */
1210 if (db_result != KDB_DB_BPT) {
1211 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1212 db_result);
1213 KDB_DEBUG_STATE("kdb_local 6", reason);
1214 return 0; /* Not for us, dismiss it */
1215 }
1216 break;
1217 case KDB_REASON_RECURSE:
1218 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1219 instruction_pointer(regs));
1220 break;
1221 default:
1222 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1223 KDB_DEBUG_STATE("kdb_local 8", reason);
1224 return 0; /* Not for us, dismiss it */
1225 }
1226
1227 while (1) {
1228 /*
1229 * Initialize pager context.
1230 */
1231 kdb_nextline = 1;
1232 KDB_STATE_CLEAR(SUPPRESS);
1233
1234 cmdbuf = cmd_cur;
1235 *cmdbuf = '\0';
1236 *(cmd_hist[cmd_head]) = '\0';
1237
1238 if (KDB_FLAG(ONLY_DO_DUMP)) {
1239 /* kdb is off but a catastrophic error requires a dump.
1240 * Take the dump and reboot.
1241 * Turn on logging so the kdb output appears in the log
1242 * buffer in the dump.
1243 */
1244 const char *setargs[] = { "set", "LOGGING", "1" };
1245 kdb_set(2, setargs);
1246 kdb_reboot(0, NULL);
1247 /*NOTREACHED*/
1248 }
1249
1250do_full_getstr:
1251#if defined(CONFIG_SMP)
1252 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1253 raw_smp_processor_id());
1254#else
1255 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1256#endif
1257 if (defcmd_in_progress)
1258 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1259
1260 /*
1261 * Fetch command from keyboard
1262 */
1263 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1264 if (*cmdbuf != '\n') {
1265 if (*cmdbuf < 32) {
1266 if (cmdptr == cmd_head) {
1267 strncpy(cmd_hist[cmd_head], cmd_cur,
1268 CMD_BUFLEN);
1269 *(cmd_hist[cmd_head] +
1270 strlen(cmd_hist[cmd_head])-1) = '\0';
1271 }
1272 if (!handle_ctrl_cmd(cmdbuf))
1273 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1274 cmdbuf = cmd_cur;
1275 goto do_full_getstr;
1276 } else {
1277 strncpy(cmd_hist[cmd_head], cmd_cur,
1278 CMD_BUFLEN);
1279 }
1280
1281 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1282 if (cmd_head == cmd_tail)
1283 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1284 }
1285
1286 cmdptr = cmd_head;
1287 diag = kdb_parse(cmdbuf);
1288 if (diag == KDB_NOTFOUND) {
1289 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1290 diag = 0;
1291 }
1292 if (diag == KDB_CMD_GO
1293 || diag == KDB_CMD_CPU
1294 || diag == KDB_CMD_SS
1295 || diag == KDB_CMD_SSB
1296 || diag == KDB_CMD_KGDB)
1297 break;
1298
1299 if (diag)
1300 kdb_cmderror(diag);
1301 }
1302 KDB_DEBUG_STATE("kdb_local 9", diag);
1303 return diag;
1304}
1305
1306
1307/*
1308 * kdb_print_state - Print the state data for the current processor
1309 * for debugging.
1310 * Inputs:
1311 * text Identifies the debug point
1312 * value Any integer value to be printed, e.g. reason code.
1313 */
1314void kdb_print_state(const char *text, int value)
1315{
1316 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1317 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1318 kdb_state);
1319}
1320
1321/*
1322 * kdb_main_loop - After initial setup and assignment of the
1323 * controlling cpu, all cpus are in this loop. One cpu is in
1324 * control and will issue the kdb prompt, the others will spin
1325 * until 'go' or cpu switch.
1326 *
1327 * To get a consistent view of the kernel stacks for all
1328 * processes, this routine is invoked from the main kdb code via
1329 * an architecture specific routine. kdba_main_loop is
1330 * responsible for making the kernel stacks consistent for all
1331 * processes, there should be no difference between a blocked
1332 * process and a running process as far as kdb is concerned.
1333 * Inputs:
1334 * reason The reason KDB was invoked
1335 * error The hardware-defined error code
1336 * reason2 kdb's current reason code.
1337 * Initially error but can change
1338 * according to kdb state.
1339 * db_result Result code from break or debug point.
1340 * regs The exception frame at time of fault/breakpoint.
1341 * should always be valid.
1342 * Returns:
1343 * 0 KDB was invoked for an event which it wasn't responsible
1344 * 1 KDB handled the event for which it was invoked.
1345 */
1346int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1347 kdb_dbtrap_t db_result, struct pt_regs *regs)
1348{
1349 int result = 1;
1350 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1351 while (1) {
1352 /*
1353 * All processors except the one that is in control
1354 * will spin here.
1355 */
1356 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1357 while (KDB_STATE(HOLD_CPU)) {
1358 /* state KDB is turned off by kdb_cpu to see if the
1359 * other cpus are still live, each cpu in this loop
1360 * turns it back on.
1361 */
1362 if (!KDB_STATE(KDB))
1363 KDB_STATE_SET(KDB);
1364 }
1365
1366 KDB_STATE_CLEAR(SUPPRESS);
1367 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1368 if (KDB_STATE(LEAVING))
1369 break; /* Another cpu said 'go' */
1370 /* Still using kdb, this processor is in control */
1371 result = kdb_local(reason2, error, regs, db_result);
1372 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1373
1374 if (result == KDB_CMD_CPU)
1375 break;
1376
1377 if (result == KDB_CMD_SS) {
1378 KDB_STATE_SET(DOING_SS);
1379 break;
1380 }
1381
1382 if (result == KDB_CMD_SSB) {
1383 KDB_STATE_SET(DOING_SS);
1384 KDB_STATE_SET(DOING_SSB);
1385 break;
1386 }
1387
1388 if (result == KDB_CMD_KGDB) {
1389 if (!KDB_STATE(DOING_KGDB))
1390 kdb_printf("Entering please attach debugger "
1391 "or use $D#44+ or $3#33\n");
1392 break;
1393 }
1394 if (result && result != 1 && result != KDB_CMD_GO)
1395 kdb_printf("\nUnexpected kdb_local return code %d\n",
1396 result);
1397 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1398 break;
1399 }
1400 if (KDB_STATE(DOING_SS))
1401 KDB_STATE_CLEAR(SSBPT);
1402
1403 return result;
1404}
1405
1406/*
1407 * kdb_mdr - This function implements the guts of the 'mdr', memory
1408 * read command.
1409 * mdr <addr arg>,<byte count>
1410 * Inputs:
1411 * addr Start address
1412 * count Number of bytes
1413 * Returns:
1414 * Always 0. Any errors are detected and printed by kdb_getarea.
1415 */
1416static int kdb_mdr(unsigned long addr, unsigned int count)
1417{
1418 unsigned char c;
1419 while (count--) {
1420 if (kdb_getarea(c, addr))
1421 return 0;
1422 kdb_printf("%02x", c);
1423 addr++;
1424 }
1425 kdb_printf("\n");
1426 return 0;
1427}
1428
1429/*
1430 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1431 * 'md8' 'mdr' and 'mds' commands.
1432 *
1433 * md|mds [<addr arg> [<line count> [<radix>]]]
1434 * mdWcN [<addr arg> [<line count> [<radix>]]]
1435 * where W = is the width (1, 2, 4 or 8) and N is the count.
1436 * for eg., md1c20 reads 20 bytes, 1 at a time.
1437 * mdr <addr arg>,<byte count>
1438 */
1439static void kdb_md_line(const char *fmtstr, unsigned long addr,
1440 int symbolic, int nosect, int bytesperword,
1441 int num, int repeat, int phys)
1442{
1443 /* print just one line of data */
1444 kdb_symtab_t symtab;
1445 char cbuf[32];
1446 char *c = cbuf;
1447 int i;
1448 unsigned long word;
1449
1450 memset(cbuf, '\0', sizeof(cbuf));
1451 if (phys)
1452 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1453 else
1454 kdb_printf(kdb_machreg_fmt0 " ", addr);
1455
1456 for (i = 0; i < num && repeat--; i++) {
1457 if (phys) {
1458 if (kdb_getphysword(&word, addr, bytesperword))
1459 break;
1460 } else if (kdb_getword(&word, addr, bytesperword))
1461 break;
1462 kdb_printf(fmtstr, word);
1463 if (symbolic)
1464 kdbnearsym(word, &symtab);
1465 else
1466 memset(&symtab, 0, sizeof(symtab));
1467 if (symtab.sym_name) {
1468 kdb_symbol_print(word, &symtab, 0);
1469 if (!nosect) {
1470 kdb_printf("\n");
1471 kdb_printf(" %s %s "
1472 kdb_machreg_fmt " "
1473 kdb_machreg_fmt " "
1474 kdb_machreg_fmt, symtab.mod_name,
1475 symtab.sec_name, symtab.sec_start,
1476 symtab.sym_start, symtab.sym_end);
1477 }
1478 addr += bytesperword;
1479 } else {
1480 union {
1481 u64 word;
1482 unsigned char c[8];
1483 } wc;
1484 unsigned char *cp;
1485#ifdef __BIG_ENDIAN
1486 cp = wc.c + 8 - bytesperword;
1487#else
1488 cp = wc.c;
1489#endif
1490 wc.word = word;
1491#define printable_char(c) \
1492 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1493 switch (bytesperword) {
1494 case 8:
1495 *c++ = printable_char(*cp++);
1496 *c++ = printable_char(*cp++);
1497 *c++ = printable_char(*cp++);
1498 *c++ = printable_char(*cp++);
1499 addr += 4;
1500 case 4:
1501 *c++ = printable_char(*cp++);
1502 *c++ = printable_char(*cp++);
1503 addr += 2;
1504 case 2:
1505 *c++ = printable_char(*cp++);
1506 addr++;
1507 case 1:
1508 *c++ = printable_char(*cp++);
1509 addr++;
1510 break;
1511 }
1512#undef printable_char
1513 }
1514 }
1515 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1516 " ", cbuf);
1517}
1518
1519static int kdb_md(int argc, const char **argv)
1520{
1521 static unsigned long last_addr;
1522 static int last_radix, last_bytesperword, last_repeat;
1523 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1524 int nosect = 0;
1525 char fmtchar, fmtstr[64];
1526 unsigned long addr;
1527 unsigned long word;
1528 long offset = 0;
1529 int symbolic = 0;
1530 int valid = 0;
1531 int phys = 0;
1532
1533 kdbgetintenv("MDCOUNT", &mdcount);
1534 kdbgetintenv("RADIX", &radix);
1535 kdbgetintenv("BYTESPERWORD", &bytesperword);
1536
1537 /* Assume 'md <addr>' and start with environment values */
1538 repeat = mdcount * 16 / bytesperword;
1539
1540 if (strcmp(argv[0], "mdr") == 0) {
1541 if (argc != 2)
1542 return KDB_ARGCOUNT;
1543 valid = 1;
1544 } else if (isdigit(argv[0][2])) {
1545 bytesperword = (int)(argv[0][2] - '0');
1546 if (bytesperword == 0) {
1547 bytesperword = last_bytesperword;
1548 if (bytesperword == 0)
1549 bytesperword = 4;
1550 }
1551 last_bytesperword = bytesperword;
1552 repeat = mdcount * 16 / bytesperword;
1553 if (!argv[0][3])
1554 valid = 1;
1555 else if (argv[0][3] == 'c' && argv[0][4]) {
1556 char *p;
1557 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1558 mdcount = ((repeat * bytesperword) + 15) / 16;
1559 valid = !*p;
1560 }
1561 last_repeat = repeat;
1562 } else if (strcmp(argv[0], "md") == 0)
1563 valid = 1;
1564 else if (strcmp(argv[0], "mds") == 0)
1565 valid = 1;
1566 else if (strcmp(argv[0], "mdp") == 0) {
1567 phys = valid = 1;
1568 }
1569 if (!valid)
1570 return KDB_NOTFOUND;
1571
1572 if (argc == 0) {
1573 if (last_addr == 0)
1574 return KDB_ARGCOUNT;
1575 addr = last_addr;
1576 radix = last_radix;
1577 bytesperword = last_bytesperword;
1578 repeat = last_repeat;
1579 mdcount = ((repeat * bytesperword) + 15) / 16;
1580 }
1581
1582 if (argc) {
1583 unsigned long val;
1584 int diag, nextarg = 1;
1585 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1586 &offset, NULL);
1587 if (diag)
1588 return diag;
1589 if (argc > nextarg+2)
1590 return KDB_ARGCOUNT;
1591
1592 if (argc >= nextarg) {
1593 diag = kdbgetularg(argv[nextarg], &val);
1594 if (!diag) {
1595 mdcount = (int) val;
1596 repeat = mdcount * 16 / bytesperword;
1597 }
1598 }
1599 if (argc >= nextarg+1) {
1600 diag = kdbgetularg(argv[nextarg+1], &val);
1601 if (!diag)
1602 radix = (int) val;
1603 }
1604 }
1605
1606 if (strcmp(argv[0], "mdr") == 0)
1607 return kdb_mdr(addr, mdcount);
1608
1609 switch (radix) {
1610 case 10:
1611 fmtchar = 'd';
1612 break;
1613 case 16:
1614 fmtchar = 'x';
1615 break;
1616 case 8:
1617 fmtchar = 'o';
1618 break;
1619 default:
1620 return KDB_BADRADIX;
1621 }
1622
1623 last_radix = radix;
1624
1625 if (bytesperword > KDB_WORD_SIZE)
1626 return KDB_BADWIDTH;
1627
1628 switch (bytesperword) {
1629 case 8:
1630 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1631 break;
1632 case 4:
1633 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1634 break;
1635 case 2:
1636 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1637 break;
1638 case 1:
1639 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1640 break;
1641 default:
1642 return KDB_BADWIDTH;
1643 }
1644
1645 last_repeat = repeat;
1646 last_bytesperword = bytesperword;
1647
1648 if (strcmp(argv[0], "mds") == 0) {
1649 symbolic = 1;
1650 /* Do not save these changes as last_*, they are temporary mds
1651 * overrides.
1652 */
1653 bytesperword = KDB_WORD_SIZE;
1654 repeat = mdcount;
1655 kdbgetintenv("NOSECT", &nosect);
1656 }
1657
1658 /* Round address down modulo BYTESPERWORD */
1659
1660 addr &= ~(bytesperword-1);
1661
1662 while (repeat > 0) {
1663 unsigned long a;
1664 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1665
1666 if (KDB_FLAG(CMD_INTERRUPT))
1667 return 0;
1668 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1669 if (phys) {
1670 if (kdb_getphysword(&word, a, bytesperword)
1671 || word)
1672 break;
1673 } else if (kdb_getword(&word, a, bytesperword) || word)
1674 break;
1675 }
1676 n = min(num, repeat);
1677 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1678 num, repeat, phys);
1679 addr += bytesperword * n;
1680 repeat -= n;
1681 z = (z + num - 1) / num;
1682 if (z > 2) {
1683 int s = num * (z-2);
1684 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1685 " zero suppressed\n",
1686 addr, addr + bytesperword * s - 1);
1687 addr += bytesperword * s;
1688 repeat -= s;
1689 }
1690 }
1691 last_addr = addr;
1692
1693 return 0;
1694}
1695
1696/*
1697 * kdb_mm - This function implements the 'mm' command.
1698 * mm address-expression new-value
1699 * Remarks:
1700 * mm works on machine words, mmW works on bytes.
1701 */
1702static int kdb_mm(int argc, const char **argv)
1703{
1704 int diag;
1705 unsigned long addr;
1706 long offset = 0;
1707 unsigned long contents;
1708 int nextarg;
1709 int width;
1710
1711 if (argv[0][2] && !isdigit(argv[0][2]))
1712 return KDB_NOTFOUND;
1713
1714 if (argc < 2)
1715 return KDB_ARGCOUNT;
1716
1717 nextarg = 1;
1718 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1719 if (diag)
1720 return diag;
1721
1722 if (nextarg > argc)
1723 return KDB_ARGCOUNT;
1724 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1725 if (diag)
1726 return diag;
1727
1728 if (nextarg != argc + 1)
1729 return KDB_ARGCOUNT;
1730
1731 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1732 diag = kdb_putword(addr, contents, width);
1733 if (diag)
1734 return diag;
1735
1736 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1737
1738 return 0;
1739}
1740
1741/*
1742 * kdb_go - This function implements the 'go' command.
1743 * go [address-expression]
1744 */
1745static int kdb_go(int argc, const char **argv)
1746{
1747 unsigned long addr;
1748 int diag;
1749 int nextarg;
1750 long offset;
1751
1752 if (raw_smp_processor_id() != kdb_initial_cpu) {
1753 kdb_printf("go must execute on the entry cpu, "
1754 "please use \"cpu %d\" and then execute go\n",
1755 kdb_initial_cpu);
1756 return KDB_BADCPUNUM;
1757 }
1758 if (argc == 1) {
1759 nextarg = 1;
1760 diag = kdbgetaddrarg(argc, argv, &nextarg,
1761 &addr, &offset, NULL);
1762 if (diag)
1763 return diag;
1764 } else if (argc) {
1765 return KDB_ARGCOUNT;
1766 }
1767
1768 diag = KDB_CMD_GO;
1769 if (KDB_FLAG(CATASTROPHIC)) {
1770 kdb_printf("Catastrophic error detected\n");
1771 kdb_printf("kdb_continue_catastrophic=%d, ",
1772 kdb_continue_catastrophic);
1773 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1774 kdb_printf("type go a second time if you really want "
1775 "to continue\n");
1776 return 0;
1777 }
1778 if (kdb_continue_catastrophic == 2) {
1779 kdb_printf("forcing reboot\n");
1780 kdb_reboot(0, NULL);
1781 }
1782 kdb_printf("attempting to continue\n");
1783 }
1784 return diag;
1785}
1786
1787/*
1788 * kdb_rd - This function implements the 'rd' command.
1789 */
1790static int kdb_rd(int argc, const char **argv)
1791{
1792 int len = kdb_check_regs();
1793#if DBG_MAX_REG_NUM > 0
1794 int i;
1795 char *rname;
1796 int rsize;
1797 u64 reg64;
1798 u32 reg32;
1799 u16 reg16;
1800 u8 reg8;
1801
1802 if (len)
1803 return len;
1804
1805 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1806 rsize = dbg_reg_def[i].size * 2;
1807 if (rsize > 16)
1808 rsize = 2;
1809 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1810 len = 0;
1811 kdb_printf("\n");
1812 }
1813 if (len)
1814 len += kdb_printf(" ");
1815 switch(dbg_reg_def[i].size * 8) {
1816 case 8:
1817 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1818 if (!rname)
1819 break;
1820 len += kdb_printf("%s: %02x", rname, reg8);
1821 break;
1822 case 16:
1823 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1824 if (!rname)
1825 break;
1826 len += kdb_printf("%s: %04x", rname, reg16);
1827 break;
1828 case 32:
1829 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1830 if (!rname)
1831 break;
1832 len += kdb_printf("%s: %08x", rname, reg32);
1833 break;
1834 case 64:
1835 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1836 if (!rname)
1837 break;
1838 len += kdb_printf("%s: %016llx", rname, reg64);
1839 break;
1840 default:
1841 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1842 }
1843 }
1844 kdb_printf("\n");
1845#else
1846 if (len)
1847 return len;
1848
1849 kdb_dumpregs(kdb_current_regs);
1850#endif
1851 return 0;
1852}
1853
1854/*
1855 * kdb_rm - This function implements the 'rm' (register modify) command.
1856 * rm register-name new-contents
1857 * Remarks:
1858 * Allows register modification with the same restrictions as gdb
1859 */
1860static int kdb_rm(int argc, const char **argv)
1861{
1862#if DBG_MAX_REG_NUM > 0
1863 int diag;
1864 const char *rname;
1865 int i;
1866 u64 reg64;
1867 u32 reg32;
1868 u16 reg16;
1869 u8 reg8;
1870
1871 if (argc != 2)
1872 return KDB_ARGCOUNT;
1873 /*
1874 * Allow presence or absence of leading '%' symbol.
1875 */
1876 rname = argv[1];
1877 if (*rname == '%')
1878 rname++;
1879
1880 diag = kdbgetu64arg(argv[2], ®64);
1881 if (diag)
1882 return diag;
1883
1884 diag = kdb_check_regs();
1885 if (diag)
1886 return diag;
1887
1888 diag = KDB_BADREG;
1889 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1890 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1891 diag = 0;
1892 break;
1893 }
1894 }
1895 if (!diag) {
1896 switch(dbg_reg_def[i].size * 8) {
1897 case 8:
1898 reg8 = reg64;
1899 dbg_set_reg(i, ®8, kdb_current_regs);
1900 break;
1901 case 16:
1902 reg16 = reg64;
1903 dbg_set_reg(i, ®16, kdb_current_regs);
1904 break;
1905 case 32:
1906 reg32 = reg64;
1907 dbg_set_reg(i, ®32, kdb_current_regs);
1908 break;
1909 case 64:
1910 dbg_set_reg(i, ®64, kdb_current_regs);
1911 break;
1912 }
1913 }
1914 return diag;
1915#else
1916 kdb_printf("ERROR: Register set currently not implemented\n");
1917 return 0;
1918#endif
1919}
1920
1921#if defined(CONFIG_MAGIC_SYSRQ)
1922/*
1923 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1924 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1925 * sr <magic-sysrq-code>
1926 */
1927static int kdb_sr(int argc, const char **argv)
1928{
1929 if (argc != 1)
1930 return KDB_ARGCOUNT;
1931 kdb_trap_printk++;
1932 __handle_sysrq(*argv[1], false);
1933 kdb_trap_printk--;
1934
1935 return 0;
1936}
1937#endif /* CONFIG_MAGIC_SYSRQ */
1938
1939/*
1940 * kdb_ef - This function implements the 'regs' (display exception
1941 * frame) command. This command takes an address and expects to
1942 * find an exception frame at that address, formats and prints
1943 * it.
1944 * regs address-expression
1945 * Remarks:
1946 * Not done yet.
1947 */
1948static int kdb_ef(int argc, const char **argv)
1949{
1950 int diag;
1951 unsigned long addr;
1952 long offset;
1953 int nextarg;
1954
1955 if (argc != 1)
1956 return KDB_ARGCOUNT;
1957
1958 nextarg = 1;
1959 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1960 if (diag)
1961 return diag;
1962 show_regs((struct pt_regs *)addr);
1963 return 0;
1964}
1965
1966#if defined(CONFIG_MODULES)
1967/*
1968 * kdb_lsmod - This function implements the 'lsmod' command. Lists
1969 * currently loaded kernel modules.
1970 * Mostly taken from userland lsmod.
1971 */
1972static int kdb_lsmod(int argc, const char **argv)
1973{
1974 struct module *mod;
1975
1976 if (argc != 0)
1977 return KDB_ARGCOUNT;
1978
1979 kdb_printf("Module Size modstruct Used by\n");
1980 list_for_each_entry(mod, kdb_modules, list) {
1981
1982 kdb_printf("%-20s%8u 0x%p ", mod->name,
1983 mod->core_size, (void *)mod);
1984#ifdef CONFIG_MODULE_UNLOAD
1985 kdb_printf("%4d ", module_refcount(mod));
1986#endif
1987 if (mod->state == MODULE_STATE_GOING)
1988 kdb_printf(" (Unloading)");
1989 else if (mod->state == MODULE_STATE_COMING)
1990 kdb_printf(" (Loading)");
1991 else
1992 kdb_printf(" (Live)");
1993 kdb_printf(" 0x%p", mod->module_core);
1994
1995#ifdef CONFIG_MODULE_UNLOAD
1996 {
1997 struct module_use *use;
1998 kdb_printf(" [ ");
1999 list_for_each_entry(use, &mod->source_list,
2000 source_list)
2001 kdb_printf("%s ", use->target->name);
2002 kdb_printf("]\n");
2003 }
2004#endif
2005 }
2006
2007 return 0;
2008}
2009
2010#endif /* CONFIG_MODULES */
2011
2012/*
2013 * kdb_env - This function implements the 'env' command. Display the
2014 * current environment variables.
2015 */
2016
2017static int kdb_env(int argc, const char **argv)
2018{
2019 int i;
2020
2021 for (i = 0; i < __nenv; i++) {
2022 if (__env[i])
2023 kdb_printf("%s\n", __env[i]);
2024 }
2025
2026 if (KDB_DEBUG(MASK))
2027 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2028
2029 return 0;
2030}
2031
2032#ifdef CONFIG_PRINTK
2033/*
2034 * kdb_dmesg - This function implements the 'dmesg' command to display
2035 * the contents of the syslog buffer.
2036 * dmesg [lines] [adjust]
2037 */
2038static int kdb_dmesg(int argc, const char **argv)
2039{
2040 char *syslog_data[4], *start, *end, c = '\0', *p;
2041 int diag, logging, logsize, lines = 0, adjust = 0, n;
2042
2043 if (argc > 2)
2044 return KDB_ARGCOUNT;
2045 if (argc) {
2046 char *cp;
2047 lines = simple_strtol(argv[1], &cp, 0);
2048 if (*cp)
2049 lines = 0;
2050 if (argc > 1) {
2051 adjust = simple_strtoul(argv[2], &cp, 0);
2052 if (*cp || adjust < 0)
2053 adjust = 0;
2054 }
2055 }
2056
2057 /* disable LOGGING if set */
2058 diag = kdbgetintenv("LOGGING", &logging);
2059 if (!diag && logging) {
2060 const char *setargs[] = { "set", "LOGGING", "0" };
2061 kdb_set(2, setargs);
2062 }
2063
2064 /* syslog_data[0,1] physical start, end+1. syslog_data[2,3]
2065 * logical start, end+1. */
2066 kdb_syslog_data(syslog_data);
2067 if (syslog_data[2] == syslog_data[3])
2068 return 0;
2069 logsize = syslog_data[1] - syslog_data[0];
2070 start = syslog_data[2];
2071 end = syslog_data[3];
2072#define KDB_WRAP(p) (((p - syslog_data[0]) % logsize) + syslog_data[0])
2073 for (n = 0, p = start; p < end; ++p) {
2074 c = *KDB_WRAP(p);
2075 if (c == '\n')
2076 ++n;
2077 }
2078 if (c != '\n')
2079 ++n;
2080 if (lines < 0) {
2081 if (adjust >= n)
2082 kdb_printf("buffer only contains %d lines, nothing "
2083 "printed\n", n);
2084 else if (adjust - lines >= n)
2085 kdb_printf("buffer only contains %d lines, last %d "
2086 "lines printed\n", n, n - adjust);
2087 if (adjust) {
2088 for (; start < end && adjust; ++start) {
2089 if (*KDB_WRAP(start) == '\n')
2090 --adjust;
2091 }
2092 if (start < end)
2093 ++start;
2094 }
2095 for (p = start; p < end && lines; ++p) {
2096 if (*KDB_WRAP(p) == '\n')
2097 ++lines;
2098 }
2099 end = p;
2100 } else if (lines > 0) {
2101 int skip = n - (adjust + lines);
2102 if (adjust >= n) {
2103 kdb_printf("buffer only contains %d lines, "
2104 "nothing printed\n", n);
2105 skip = n;
2106 } else if (skip < 0) {
2107 lines += skip;
2108 skip = 0;
2109 kdb_printf("buffer only contains %d lines, first "
2110 "%d lines printed\n", n, lines);
2111 }
2112 for (; start < end && skip; ++start) {
2113 if (*KDB_WRAP(start) == '\n')
2114 --skip;
2115 }
2116 for (p = start; p < end && lines; ++p) {
2117 if (*KDB_WRAP(p) == '\n')
2118 --lines;
2119 }
2120 end = p;
2121 }
2122 /* Do a line at a time (max 200 chars) to reduce protocol overhead */
2123 c = '\n';
2124 while (start != end) {
2125 char buf[201];
2126 p = buf;
2127 if (KDB_FLAG(CMD_INTERRUPT))
2128 return 0;
2129 while (start < end && (c = *KDB_WRAP(start)) &&
2130 (p - buf) < sizeof(buf)-1) {
2131 ++start;
2132 *p++ = c;
2133 if (c == '\n')
2134 break;
2135 }
2136 *p = '\0';
2137 kdb_printf("%s", buf);
2138 }
2139 if (c != '\n')
2140 kdb_printf("\n");
2141
2142 return 0;
2143}
2144#endif /* CONFIG_PRINTK */
2145/*
2146 * kdb_cpu - This function implements the 'cpu' command.
2147 * cpu [<cpunum>]
2148 * Returns:
2149 * KDB_CMD_CPU for success, a kdb diagnostic if error
2150 */
2151static void kdb_cpu_status(void)
2152{
2153 int i, start_cpu, first_print = 1;
2154 char state, prev_state = '?';
2155
2156 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2157 kdb_printf("Available cpus: ");
2158 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2159 if (!cpu_online(i)) {
2160 state = 'F'; /* cpu is offline */
2161 } else {
2162 state = ' '; /* cpu is responding to kdb */
2163 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2164 state = 'I'; /* idle task */
2165 }
2166 if (state != prev_state) {
2167 if (prev_state != '?') {
2168 if (!first_print)
2169 kdb_printf(", ");
2170 first_print = 0;
2171 kdb_printf("%d", start_cpu);
2172 if (start_cpu < i-1)
2173 kdb_printf("-%d", i-1);
2174 if (prev_state != ' ')
2175 kdb_printf("(%c)", prev_state);
2176 }
2177 prev_state = state;
2178 start_cpu = i;
2179 }
2180 }
2181 /* print the trailing cpus, ignoring them if they are all offline */
2182 if (prev_state != 'F') {
2183 if (!first_print)
2184 kdb_printf(", ");
2185 kdb_printf("%d", start_cpu);
2186 if (start_cpu < i-1)
2187 kdb_printf("-%d", i-1);
2188 if (prev_state != ' ')
2189 kdb_printf("(%c)", prev_state);
2190 }
2191 kdb_printf("\n");
2192}
2193
2194static int kdb_cpu(int argc, const char **argv)
2195{
2196 unsigned long cpunum;
2197 int diag;
2198
2199 if (argc == 0) {
2200 kdb_cpu_status();
2201 return 0;
2202 }
2203
2204 if (argc != 1)
2205 return KDB_ARGCOUNT;
2206
2207 diag = kdbgetularg(argv[1], &cpunum);
2208 if (diag)
2209 return diag;
2210
2211 /*
2212 * Validate cpunum
2213 */
2214 if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
2215 return KDB_BADCPUNUM;
2216
2217 dbg_switch_cpu = cpunum;
2218
2219 /*
2220 * Switch to other cpu
2221 */
2222 return KDB_CMD_CPU;
2223}
2224
2225/* The user may not realize that ps/bta with no parameters does not print idle
2226 * or sleeping system daemon processes, so tell them how many were suppressed.
2227 */
2228void kdb_ps_suppressed(void)
2229{
2230 int idle = 0, daemon = 0;
2231 unsigned long mask_I = kdb_task_state_string("I"),
2232 mask_M = kdb_task_state_string("M");
2233 unsigned long cpu;
2234 const struct task_struct *p, *g;
2235 for_each_online_cpu(cpu) {
2236 p = kdb_curr_task(cpu);
2237 if (kdb_task_state(p, mask_I))
2238 ++idle;
2239 }
2240 kdb_do_each_thread(g, p) {
2241 if (kdb_task_state(p, mask_M))
2242 ++daemon;
2243 } kdb_while_each_thread(g, p);
2244 if (idle || daemon) {
2245 if (idle)
2246 kdb_printf("%d idle process%s (state I)%s\n",
2247 idle, idle == 1 ? "" : "es",
2248 daemon ? " and " : "");
2249 if (daemon)
2250 kdb_printf("%d sleeping system daemon (state M) "
2251 "process%s", daemon,
2252 daemon == 1 ? "" : "es");
2253 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2254 }
2255}
2256
2257/*
2258 * kdb_ps - This function implements the 'ps' command which shows a
2259 * list of the active processes.
2260 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2261 */
2262void kdb_ps1(const struct task_struct *p)
2263{
2264 int cpu;
2265 unsigned long tmp;
2266
2267 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2268 return;
2269
2270 cpu = kdb_process_cpu(p);
2271 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2272 (void *)p, p->pid, p->parent->pid,
2273 kdb_task_has_cpu(p), kdb_process_cpu(p),
2274 kdb_task_state_char(p),
2275 (void *)(&p->thread),
2276 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2277 p->comm);
2278 if (kdb_task_has_cpu(p)) {
2279 if (!KDB_TSK(cpu)) {
2280 kdb_printf(" Error: no saved data for this cpu\n");
2281 } else {
2282 if (KDB_TSK(cpu) != p)
2283 kdb_printf(" Error: does not match running "
2284 "process table (0x%p)\n", KDB_TSK(cpu));
2285 }
2286 }
2287}
2288
2289static int kdb_ps(int argc, const char **argv)
2290{
2291 struct task_struct *g, *p;
2292 unsigned long mask, cpu;
2293
2294 if (argc == 0)
2295 kdb_ps_suppressed();
2296 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2297 (int)(2*sizeof(void *))+2, "Task Addr",
2298 (int)(2*sizeof(void *))+2, "Thread");
2299 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2300 /* Run the active tasks first */
2301 for_each_online_cpu(cpu) {
2302 if (KDB_FLAG(CMD_INTERRUPT))
2303 return 0;
2304 p = kdb_curr_task(cpu);
2305 if (kdb_task_state(p, mask))
2306 kdb_ps1(p);
2307 }
2308 kdb_printf("\n");
2309 /* Now the real tasks */
2310 kdb_do_each_thread(g, p) {
2311 if (KDB_FLAG(CMD_INTERRUPT))
2312 return 0;
2313 if (kdb_task_state(p, mask))
2314 kdb_ps1(p);
2315 } kdb_while_each_thread(g, p);
2316
2317 return 0;
2318}
2319
2320/*
2321 * kdb_pid - This function implements the 'pid' command which switches
2322 * the currently active process.
2323 * pid [<pid> | R]
2324 */
2325static int kdb_pid(int argc, const char **argv)
2326{
2327 struct task_struct *p;
2328 unsigned long val;
2329 int diag;
2330
2331 if (argc > 1)
2332 return KDB_ARGCOUNT;
2333
2334 if (argc) {
2335 if (strcmp(argv[1], "R") == 0) {
2336 p = KDB_TSK(kdb_initial_cpu);
2337 } else {
2338 diag = kdbgetularg(argv[1], &val);
2339 if (diag)
2340 return KDB_BADINT;
2341
2342 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2343 if (!p) {
2344 kdb_printf("No task with pid=%d\n", (pid_t)val);
2345 return 0;
2346 }
2347 }
2348 kdb_set_current_task(p);
2349 }
2350 kdb_printf("KDB current process is %s(pid=%d)\n",
2351 kdb_current_task->comm,
2352 kdb_current_task->pid);
2353
2354 return 0;
2355}
2356
2357/*
2358 * kdb_ll - This function implements the 'll' command which follows a
2359 * linked list and executes an arbitrary command for each
2360 * element.
2361 */
2362static int kdb_ll(int argc, const char **argv)
2363{
2364 int diag = 0;
2365 unsigned long addr;
2366 long offset = 0;
2367 unsigned long va;
2368 unsigned long linkoffset;
2369 int nextarg;
2370 const char *command;
2371
2372 if (argc != 3)
2373 return KDB_ARGCOUNT;
2374
2375 nextarg = 1;
2376 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2377 if (diag)
2378 return diag;
2379
2380 diag = kdbgetularg(argv[2], &linkoffset);
2381 if (diag)
2382 return diag;
2383
2384 /*
2385 * Using the starting address as
2386 * the first element in the list, and assuming that
2387 * the list ends with a null pointer.
2388 */
2389
2390 va = addr;
2391 command = kdb_strdup(argv[3], GFP_KDB);
2392 if (!command) {
2393 kdb_printf("%s: cannot duplicate command\n", __func__);
2394 return 0;
2395 }
2396 /* Recursive use of kdb_parse, do not use argv after this point */
2397 argv = NULL;
2398
2399 while (va) {
2400 char buf[80];
2401
2402 if (KDB_FLAG(CMD_INTERRUPT))
2403 goto out;
2404
2405 sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va);
2406 diag = kdb_parse(buf);
2407 if (diag)
2408 goto out;
2409
2410 addr = va + linkoffset;
2411 if (kdb_getword(&va, addr, sizeof(va)))
2412 goto out;
2413 }
2414
2415out:
2416 kfree(command);
2417 return diag;
2418}
2419
2420static int kdb_kgdb(int argc, const char **argv)
2421{
2422 return KDB_CMD_KGDB;
2423}
2424
2425/*
2426 * kdb_help - This function implements the 'help' and '?' commands.
2427 */
2428static int kdb_help(int argc, const char **argv)
2429{
2430 kdbtab_t *kt;
2431 int i;
2432
2433 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2434 kdb_printf("-----------------------------"
2435 "-----------------------------\n");
2436 for_each_kdbcmd(kt, i) {
2437 if (kt->cmd_name)
2438 kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name,
2439 kt->cmd_usage, kt->cmd_help);
2440 if (KDB_FLAG(CMD_INTERRUPT))
2441 return 0;
2442 }
2443 return 0;
2444}
2445
2446/*
2447 * kdb_kill - This function implements the 'kill' commands.
2448 */
2449static int kdb_kill(int argc, const char **argv)
2450{
2451 long sig, pid;
2452 char *endp;
2453 struct task_struct *p;
2454 struct siginfo info;
2455
2456 if (argc != 2)
2457 return KDB_ARGCOUNT;
2458
2459 sig = simple_strtol(argv[1], &endp, 0);
2460 if (*endp)
2461 return KDB_BADINT;
2462 if (sig >= 0) {
2463 kdb_printf("Invalid signal parameter.<-signal>\n");
2464 return 0;
2465 }
2466 sig = -sig;
2467
2468 pid = simple_strtol(argv[2], &endp, 0);
2469 if (*endp)
2470 return KDB_BADINT;
2471 if (pid <= 0) {
2472 kdb_printf("Process ID must be large than 0.\n");
2473 return 0;
2474 }
2475
2476 /* Find the process. */
2477 p = find_task_by_pid_ns(pid, &init_pid_ns);
2478 if (!p) {
2479 kdb_printf("The specified process isn't found.\n");
2480 return 0;
2481 }
2482 p = p->group_leader;
2483 info.si_signo = sig;
2484 info.si_errno = 0;
2485 info.si_code = SI_USER;
2486 info.si_pid = pid; /* same capabilities as process being signalled */
2487 info.si_uid = 0; /* kdb has root authority */
2488 kdb_send_sig_info(p, &info);
2489 return 0;
2490}
2491
2492struct kdb_tm {
2493 int tm_sec; /* seconds */
2494 int tm_min; /* minutes */
2495 int tm_hour; /* hours */
2496 int tm_mday; /* day of the month */
2497 int tm_mon; /* month */
2498 int tm_year; /* year */
2499};
2500
2501static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2502{
2503 /* This will work from 1970-2099, 2100 is not a leap year */
2504 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2505 31, 30, 31, 30, 31 };
2506 memset(tm, 0, sizeof(*tm));
2507 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2508 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2509 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2510 tm->tm_min = tm->tm_sec / 60 % 60;
2511 tm->tm_hour = tm->tm_sec / 60 / 60;
2512 tm->tm_sec = tm->tm_sec % 60;
2513 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2514 tm->tm_mday %= (4*365+1);
2515 mon_day[1] = 29;
2516 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2517 tm->tm_mday -= mon_day[tm->tm_mon];
2518 if (++tm->tm_mon == 12) {
2519 tm->tm_mon = 0;
2520 ++tm->tm_year;
2521 mon_day[1] = 28;
2522 }
2523 }
2524 ++tm->tm_mday;
2525}
2526
2527/*
2528 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2529 * I cannot call that code directly from kdb, it has an unconditional
2530 * cli()/sti() and calls routines that take locks which can stop the debugger.
2531 */
2532static void kdb_sysinfo(struct sysinfo *val)
2533{
2534 struct timespec uptime;
2535 do_posix_clock_monotonic_gettime(&uptime);
2536 memset(val, 0, sizeof(*val));
2537 val->uptime = uptime.tv_sec;
2538 val->loads[0] = avenrun[0];
2539 val->loads[1] = avenrun[1];
2540 val->loads[2] = avenrun[2];
2541 val->procs = nr_threads-1;
2542 si_meminfo(val);
2543
2544 return;
2545}
2546
2547/*
2548 * kdb_summary - This function implements the 'summary' command.
2549 */
2550static int kdb_summary(int argc, const char **argv)
2551{
2552 struct timespec now;
2553 struct kdb_tm tm;
2554 struct sysinfo val;
2555
2556 if (argc)
2557 return KDB_ARGCOUNT;
2558
2559 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2560 kdb_printf("release %s\n", init_uts_ns.name.release);
2561 kdb_printf("version %s\n", init_uts_ns.name.version);
2562 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2563 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2564 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2565 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2566
2567 now = __current_kernel_time();
2568 kdb_gmtime(&now, &tm);
2569 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2570 "tz_minuteswest %d\n",
2571 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2572 tm.tm_hour, tm.tm_min, tm.tm_sec,
2573 sys_tz.tz_minuteswest);
2574
2575 kdb_sysinfo(&val);
2576 kdb_printf("uptime ");
2577 if (val.uptime > (24*60*60)) {
2578 int days = val.uptime / (24*60*60);
2579 val.uptime %= (24*60*60);
2580 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2581 }
2582 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2583
2584 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2585
2586#define LOAD_INT(x) ((x) >> FSHIFT)
2587#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2588 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2589 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2590 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2591 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2592#undef LOAD_INT
2593#undef LOAD_FRAC
2594 /* Display in kilobytes */
2595#define K(x) ((x) << (PAGE_SHIFT - 10))
2596 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2597 "Buffers: %8lu kB\n",
2598 val.totalram, val.freeram, val.bufferram);
2599 return 0;
2600}
2601
2602/*
2603 * kdb_per_cpu - This function implements the 'per_cpu' command.
2604 */
2605static int kdb_per_cpu(int argc, const char **argv)
2606{
2607 char fmtstr[64];
2608 int cpu, diag, nextarg = 1;
2609 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2610
2611 if (argc < 1 || argc > 3)
2612 return KDB_ARGCOUNT;
2613
2614 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2615 if (diag)
2616 return diag;
2617
2618 if (argc >= 2) {
2619 diag = kdbgetularg(argv[2], &bytesperword);
2620 if (diag)
2621 return diag;
2622 }
2623 if (!bytesperword)
2624 bytesperword = KDB_WORD_SIZE;
2625 else if (bytesperword > KDB_WORD_SIZE)
2626 return KDB_BADWIDTH;
2627 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2628 if (argc >= 3) {
2629 diag = kdbgetularg(argv[3], &whichcpu);
2630 if (diag)
2631 return diag;
2632 if (!cpu_online(whichcpu)) {
2633 kdb_printf("cpu %ld is not online\n", whichcpu);
2634 return KDB_BADCPUNUM;
2635 }
2636 }
2637
2638 /* Most architectures use __per_cpu_offset[cpu], some use
2639 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2640 */
2641#ifdef __per_cpu_offset
2642#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2643#else
2644#ifdef CONFIG_SMP
2645#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2646#else
2647#define KDB_PCU(cpu) 0
2648#endif
2649#endif
2650 for_each_online_cpu(cpu) {
2651 if (KDB_FLAG(CMD_INTERRUPT))
2652 return 0;
2653
2654 if (whichcpu != ~0UL && whichcpu != cpu)
2655 continue;
2656 addr = symaddr + KDB_PCU(cpu);
2657 diag = kdb_getword(&val, addr, bytesperword);
2658 if (diag) {
2659 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2660 "read, diag=%d\n", cpu, addr, diag);
2661 continue;
2662 }
2663 kdb_printf("%5d ", cpu);
2664 kdb_md_line(fmtstr, addr,
2665 bytesperword == KDB_WORD_SIZE,
2666 1, bytesperword, 1, 1, 0);
2667 }
2668#undef KDB_PCU
2669 return 0;
2670}
2671
2672/*
2673 * display help for the use of cmd | grep pattern
2674 */
2675static int kdb_grep_help(int argc, const char **argv)
2676{
2677 kdb_printf("Usage of cmd args | grep pattern:\n");
2678 kdb_printf(" Any command's output may be filtered through an ");
2679 kdb_printf("emulated 'pipe'.\n");
2680 kdb_printf(" 'grep' is just a key word.\n");
2681 kdb_printf(" The pattern may include a very limited set of "
2682 "metacharacters:\n");
2683 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2684 kdb_printf(" And if there are spaces in the pattern, you may "
2685 "quote it:\n");
2686 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2687 " or \"^pat tern$\"\n");
2688 return 0;
2689}
2690
2691/*
2692 * kdb_register_repeat - This function is used to register a kernel
2693 * debugger command.
2694 * Inputs:
2695 * cmd Command name
2696 * func Function to execute the command
2697 * usage A simple usage string showing arguments
2698 * help A simple help string describing command
2699 * repeat Does the command auto repeat on enter?
2700 * Returns:
2701 * zero for success, one if a duplicate command.
2702 */
2703#define kdb_command_extend 50 /* arbitrary */
2704int kdb_register_repeat(char *cmd,
2705 kdb_func_t func,
2706 char *usage,
2707 char *help,
2708 short minlen,
2709 kdb_repeat_t repeat)
2710{
2711 int i;
2712 kdbtab_t *kp;
2713
2714 /*
2715 * Brute force method to determine duplicates
2716 */
2717 for_each_kdbcmd(kp, i) {
2718 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2719 kdb_printf("Duplicate kdb command registered: "
2720 "%s, func %p help %s\n", cmd, func, help);
2721 return 1;
2722 }
2723 }
2724
2725 /*
2726 * Insert command into first available location in table
2727 */
2728 for_each_kdbcmd(kp, i) {
2729 if (kp->cmd_name == NULL)
2730 break;
2731 }
2732
2733 if (i >= kdb_max_commands) {
2734 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2735 kdb_command_extend) * sizeof(*new), GFP_KDB);
2736 if (!new) {
2737 kdb_printf("Could not allocate new kdb_command "
2738 "table\n");
2739 return 1;
2740 }
2741 if (kdb_commands) {
2742 memcpy(new, kdb_commands,
2743 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2744 kfree(kdb_commands);
2745 }
2746 memset(new + kdb_max_commands, 0,
2747 kdb_command_extend * sizeof(*new));
2748 kdb_commands = new;
2749 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2750 kdb_max_commands += kdb_command_extend;
2751 }
2752
2753 kp->cmd_name = cmd;
2754 kp->cmd_func = func;
2755 kp->cmd_usage = usage;
2756 kp->cmd_help = help;
2757 kp->cmd_flags = 0;
2758 kp->cmd_minlen = minlen;
2759 kp->cmd_repeat = repeat;
2760
2761 return 0;
2762}
2763EXPORT_SYMBOL_GPL(kdb_register_repeat);
2764
2765
2766/*
2767 * kdb_register - Compatibility register function for commands that do
2768 * not need to specify a repeat state. Equivalent to
2769 * kdb_register_repeat with KDB_REPEAT_NONE.
2770 * Inputs:
2771 * cmd Command name
2772 * func Function to execute the command
2773 * usage A simple usage string showing arguments
2774 * help A simple help string describing command
2775 * Returns:
2776 * zero for success, one if a duplicate command.
2777 */
2778int kdb_register(char *cmd,
2779 kdb_func_t func,
2780 char *usage,
2781 char *help,
2782 short minlen)
2783{
2784 return kdb_register_repeat(cmd, func, usage, help, minlen,
2785 KDB_REPEAT_NONE);
2786}
2787EXPORT_SYMBOL_GPL(kdb_register);
2788
2789/*
2790 * kdb_unregister - This function is used to unregister a kernel
2791 * debugger command. It is generally called when a module which
2792 * implements kdb commands is unloaded.
2793 * Inputs:
2794 * cmd Command name
2795 * Returns:
2796 * zero for success, one command not registered.
2797 */
2798int kdb_unregister(char *cmd)
2799{
2800 int i;
2801 kdbtab_t *kp;
2802
2803 /*
2804 * find the command.
2805 */
2806 for_each_kdbcmd(kp, i) {
2807 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2808 kp->cmd_name = NULL;
2809 return 0;
2810 }
2811 }
2812
2813 /* Couldn't find it. */
2814 return 1;
2815}
2816EXPORT_SYMBOL_GPL(kdb_unregister);
2817
2818/* Initialize the kdb command table. */
2819static void __init kdb_inittab(void)
2820{
2821 int i;
2822 kdbtab_t *kp;
2823
2824 for_each_kdbcmd(kp, i)
2825 kp->cmd_name = NULL;
2826
2827 kdb_register_repeat("md", kdb_md, "<vaddr>",
2828 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2829 KDB_REPEAT_NO_ARGS);
2830 kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
2831 "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
2832 kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
2833 "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
2834 kdb_register_repeat("mds", kdb_md, "<vaddr>",
2835 "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
2836 kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
2837 "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
2838 kdb_register_repeat("go", kdb_go, "[<vaddr>]",
2839 "Continue Execution", 1, KDB_REPEAT_NONE);
2840 kdb_register_repeat("rd", kdb_rd, "",
2841 "Display Registers", 0, KDB_REPEAT_NONE);
2842 kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
2843 "Modify Registers", 0, KDB_REPEAT_NONE);
2844 kdb_register_repeat("ef", kdb_ef, "<vaddr>",
2845 "Display exception frame", 0, KDB_REPEAT_NONE);
2846 kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
2847 "Stack traceback", 1, KDB_REPEAT_NONE);
2848 kdb_register_repeat("btp", kdb_bt, "<pid>",
2849 "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
2850 kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]",
2851 "Display stack all processes", 0, KDB_REPEAT_NONE);
2852 kdb_register_repeat("btc", kdb_bt, "",
2853 "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
2854 kdb_register_repeat("btt", kdb_bt, "<vaddr>",
2855 "Backtrace process given its struct task address", 0,
2856 KDB_REPEAT_NONE);
2857 kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>",
2858 "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE);
2859 kdb_register_repeat("env", kdb_env, "",
2860 "Show environment variables", 0, KDB_REPEAT_NONE);
2861 kdb_register_repeat("set", kdb_set, "",
2862 "Set environment variables", 0, KDB_REPEAT_NONE);
2863 kdb_register_repeat("help", kdb_help, "",
2864 "Display Help Message", 1, KDB_REPEAT_NONE);
2865 kdb_register_repeat("?", kdb_help, "",
2866 "Display Help Message", 0, KDB_REPEAT_NONE);
2867 kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
2868 "Switch to new cpu", 0, KDB_REPEAT_NONE);
2869 kdb_register_repeat("kgdb", kdb_kgdb, "",
2870 "Enter kgdb mode", 0, KDB_REPEAT_NONE);
2871 kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
2872 "Display active task list", 0, KDB_REPEAT_NONE);
2873 kdb_register_repeat("pid", kdb_pid, "<pidnum>",
2874 "Switch to another task", 0, KDB_REPEAT_NONE);
2875 kdb_register_repeat("reboot", kdb_reboot, "",
2876 "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
2877#if defined(CONFIG_MODULES)
2878 kdb_register_repeat("lsmod", kdb_lsmod, "",
2879 "List loaded kernel modules", 0, KDB_REPEAT_NONE);
2880#endif
2881#if defined(CONFIG_MAGIC_SYSRQ)
2882 kdb_register_repeat("sr", kdb_sr, "<key>",
2883 "Magic SysRq key", 0, KDB_REPEAT_NONE);
2884#endif
2885#if defined(CONFIG_PRINTK)
2886 kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
2887 "Display syslog buffer", 0, KDB_REPEAT_NONE);
2888#endif
2889 kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2890 "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
2891 kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
2892 "Send a signal to a process", 0, KDB_REPEAT_NONE);
2893 kdb_register_repeat("summary", kdb_summary, "",
2894 "Summarize the system", 4, KDB_REPEAT_NONE);
2895 kdb_register_repeat("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2896 "Display per_cpu variables", 3, KDB_REPEAT_NONE);
2897 kdb_register_repeat("grephelp", kdb_grep_help, "",
2898 "Display help on | grep", 0, KDB_REPEAT_NONE);
2899}
2900
2901/* Execute any commands defined in kdb_cmds. */
2902static void __init kdb_cmd_init(void)
2903{
2904 int i, diag;
2905 for (i = 0; kdb_cmds[i]; ++i) {
2906 diag = kdb_parse(kdb_cmds[i]);
2907 if (diag)
2908 kdb_printf("kdb command %s failed, kdb diag %d\n",
2909 kdb_cmds[i], diag);
2910 }
2911 if (defcmd_in_progress) {
2912 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2913 kdb_parse("endefcmd");
2914 }
2915}
2916
2917/* Initialize kdb_printf, breakpoint tables and kdb state */
2918void __init kdb_init(int lvl)
2919{
2920 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2921 int i;
2922
2923 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2924 return;
2925 for (i = kdb_init_lvl; i < lvl; i++) {
2926 switch (i) {
2927 case KDB_NOT_INITIALIZED:
2928 kdb_inittab(); /* Initialize Command Table */
2929 kdb_initbptab(); /* Initialize Breakpoints */
2930 break;
2931 case KDB_INIT_EARLY:
2932 kdb_cmd_init(); /* Build kdb_cmds tables */
2933 break;
2934 }
2935 }
2936 kdb_init_lvl = lvl;
2937}