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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/sched/loadavg.h>
22#include <linux/sched/stat.h>
23#include <linux/sched/debug.h>
24#include <linux/sysrq.h>
25#include <linux/smp.h>
26#include <linux/utsname.h>
27#include <linux/vmalloc.h>
28#include <linux/atomic.h>
29#include <linux/moduleparam.h>
30#include <linux/mm.h>
31#include <linux/init.h>
32#include <linux/kallsyms.h>
33#include <linux/kgdb.h>
34#include <linux/kdb.h>
35#include <linux/notifier.h>
36#include <linux/interrupt.h>
37#include <linux/delay.h>
38#include <linux/nmi.h>
39#include <linux/time.h>
40#include <linux/ptrace.h>
41#include <linux/sysctl.h>
42#include <linux/cpu.h>
43#include <linux/kdebug.h>
44#include <linux/proc_fs.h>
45#include <linux/uaccess.h>
46#include <linux/slab.h>
47#include <linux/security.h>
48#include "kdb_private.h"
49
50#undef MODULE_PARAM_PREFIX
51#define MODULE_PARAM_PREFIX "kdb."
52
53static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
54module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
55
56char kdb_grep_string[KDB_GREP_STRLEN];
57int kdb_grepping_flag;
58EXPORT_SYMBOL(kdb_grepping_flag);
59int kdb_grep_leading;
60int kdb_grep_trailing;
61
62/*
63 * Kernel debugger state flags
64 */
65unsigned int kdb_flags;
66
67/*
68 * kdb_lock protects updates to kdb_initial_cpu. Used to
69 * single thread processors through the kernel debugger.
70 */
71int kdb_initial_cpu = -1; /* cpu number that owns kdb */
72int kdb_nextline = 1;
73int kdb_state; /* General KDB state */
74
75struct task_struct *kdb_current_task;
76struct pt_regs *kdb_current_regs;
77
78const char *kdb_diemsg;
79static int kdb_go_count;
80#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
81static unsigned int kdb_continue_catastrophic =
82 CONFIG_KDB_CONTINUE_CATASTROPHIC;
83#else
84static unsigned int kdb_continue_catastrophic;
85#endif
86
87/* kdb_cmds_head describes the available commands. */
88static LIST_HEAD(kdb_cmds_head);
89
90typedef struct _kdbmsg {
91 int km_diag; /* kdb diagnostic */
92 char *km_msg; /* Corresponding message text */
93} kdbmsg_t;
94
95#define KDBMSG(msgnum, text) \
96 { KDB_##msgnum, text }
97
98static kdbmsg_t kdbmsgs[] = {
99 KDBMSG(NOTFOUND, "Command Not Found"),
100 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
101 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
102 "8 is only allowed on 64 bit systems"),
103 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
104 KDBMSG(NOTENV, "Cannot find environment variable"),
105 KDBMSG(NOENVVALUE, "Environment variable should have value"),
106 KDBMSG(NOTIMP, "Command not implemented"),
107 KDBMSG(ENVFULL, "Environment full"),
108 KDBMSG(ENVBUFFULL, "Environment buffer full"),
109 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
110#ifdef CONFIG_CPU_XSCALE
111 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
112#else
113 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
114#endif
115 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
116 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
117 KDBMSG(BADMODE, "Invalid IDMODE"),
118 KDBMSG(BADINT, "Illegal numeric value"),
119 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
120 KDBMSG(BADREG, "Invalid register name"),
121 KDBMSG(BADCPUNUM, "Invalid cpu number"),
122 KDBMSG(BADLENGTH, "Invalid length field"),
123 KDBMSG(NOBP, "No Breakpoint exists"),
124 KDBMSG(BADADDR, "Invalid address"),
125 KDBMSG(NOPERM, "Permission denied"),
126};
127#undef KDBMSG
128
129static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
130
131
132/*
133 * Initial environment. This is all kept static and local to
134 * this file. We don't want to rely on the memory allocation
135 * mechanisms in the kernel, so we use a very limited allocate-only
136 * heap for new and altered environment variables. The entire
137 * environment is limited to a fixed number of entries (add more
138 * to __env[] if required) and a fixed amount of heap (add more to
139 * KDB_ENVBUFSIZE if required).
140 */
141
142static char *__env[31] = {
143#if defined(CONFIG_SMP)
144 "PROMPT=[%d]kdb> ",
145#else
146 "PROMPT=kdb> ",
147#endif
148 "MOREPROMPT=more> ",
149 "RADIX=16",
150 "MDCOUNT=8", /* lines of md output */
151 KDB_PLATFORM_ENV,
152 "DTABCOUNT=30",
153 "NOSECT=1",
154};
155
156static const int __nenv = ARRAY_SIZE(__env);
157
158struct task_struct *kdb_curr_task(int cpu)
159{
160 struct task_struct *p = curr_task(cpu);
161#ifdef _TIF_MCA_INIT
162 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
163 p = krp->p;
164#endif
165 return p;
166}
167
168/*
169 * Update the permissions flags (kdb_cmd_enabled) to match the
170 * current lockdown state.
171 *
172 * Within this function the calls to security_locked_down() are "lazy". We
173 * avoid calling them if the current value of kdb_cmd_enabled already excludes
174 * flags that might be subject to lockdown. Additionally we deliberately check
175 * the lockdown flags independently (even though read lockdown implies write
176 * lockdown) since that results in both simpler code and clearer messages to
177 * the user on first-time debugger entry.
178 *
179 * The permission masks during a read+write lockdown permits the following
180 * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE).
181 *
182 * The INSPECT commands are not blocked during lockdown because they are
183 * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes
184 * forcing them to have no arguments) and lsmod. These commands do expose
185 * some kernel state but do not allow the developer seated at the console to
186 * choose what state is reported. SIGNAL and REBOOT should not be controversial,
187 * given these are allowed for root during lockdown already.
188 */
189static void kdb_check_for_lockdown(void)
190{
191 const int write_flags = KDB_ENABLE_MEM_WRITE |
192 KDB_ENABLE_REG_WRITE |
193 KDB_ENABLE_FLOW_CTRL;
194 const int read_flags = KDB_ENABLE_MEM_READ |
195 KDB_ENABLE_REG_READ;
196
197 bool need_to_lockdown_write = false;
198 bool need_to_lockdown_read = false;
199
200 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags))
201 need_to_lockdown_write =
202 security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL);
203
204 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags))
205 need_to_lockdown_read =
206 security_locked_down(LOCKDOWN_DBG_READ_KERNEL);
207
208 /* De-compose KDB_ENABLE_ALL if required */
209 if (need_to_lockdown_write || need_to_lockdown_read)
210 if (kdb_cmd_enabled & KDB_ENABLE_ALL)
211 kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL;
212
213 if (need_to_lockdown_write)
214 kdb_cmd_enabled &= ~write_flags;
215
216 if (need_to_lockdown_read)
217 kdb_cmd_enabled &= ~read_flags;
218}
219
220/*
221 * Check whether the flags of the current command, the permissions of the kdb
222 * console and the lockdown state allow a command to be run.
223 */
224static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
225 bool no_args)
226{
227 /* permissions comes from userspace so needs massaging slightly */
228 permissions &= KDB_ENABLE_MASK;
229 permissions |= KDB_ENABLE_ALWAYS_SAFE;
230
231 /* some commands change group when launched with no arguments */
232 if (no_args)
233 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
234
235 flags |= KDB_ENABLE_ALL;
236
237 return permissions & flags;
238}
239
240/*
241 * kdbgetenv - This function will return the character string value of
242 * an environment variable.
243 * Parameters:
244 * match A character string representing an environment variable.
245 * Returns:
246 * NULL No environment variable matches 'match'
247 * char* Pointer to string value of environment variable.
248 */
249char *kdbgetenv(const char *match)
250{
251 char **ep = __env;
252 int matchlen = strlen(match);
253 int i;
254
255 for (i = 0; i < __nenv; i++) {
256 char *e = *ep++;
257
258 if (!e)
259 continue;
260
261 if ((strncmp(match, e, matchlen) == 0)
262 && ((e[matchlen] == '\0')
263 || (e[matchlen] == '='))) {
264 char *cp = strchr(e, '=');
265 return cp ? ++cp : "";
266 }
267 }
268 return NULL;
269}
270
271/*
272 * kdballocenv - This function is used to allocate bytes for
273 * environment entries.
274 * Parameters:
275 * bytes The number of bytes to allocate in the static buffer.
276 * Returns:
277 * A pointer to the allocated space in the buffer on success.
278 * NULL if bytes > size available in the envbuffer.
279 * Remarks:
280 * We use a static environment buffer (envbuffer) to hold the values
281 * of dynamically generated environment variables (see kdb_set). Buffer
282 * space once allocated is never free'd, so over time, the amount of space
283 * (currently 512 bytes) will be exhausted if env variables are changed
284 * frequently.
285 */
286static char *kdballocenv(size_t bytes)
287{
288#define KDB_ENVBUFSIZE 512
289 static char envbuffer[KDB_ENVBUFSIZE];
290 static int envbufsize;
291 char *ep = NULL;
292
293 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
294 ep = &envbuffer[envbufsize];
295 envbufsize += bytes;
296 }
297 return ep;
298}
299
300/*
301 * kdbgetulenv - This function will return the value of an unsigned
302 * long-valued environment variable.
303 * Parameters:
304 * match A character string representing a numeric value
305 * Outputs:
306 * *value the unsigned long representation of the env variable 'match'
307 * Returns:
308 * Zero on success, a kdb diagnostic on failure.
309 */
310static int kdbgetulenv(const char *match, unsigned long *value)
311{
312 char *ep;
313
314 ep = kdbgetenv(match);
315 if (!ep)
316 return KDB_NOTENV;
317 if (strlen(ep) == 0)
318 return KDB_NOENVVALUE;
319
320 *value = simple_strtoul(ep, NULL, 0);
321
322 return 0;
323}
324
325/*
326 * kdbgetintenv - This function will return the value of an
327 * integer-valued environment variable.
328 * Parameters:
329 * match A character string representing an integer-valued env variable
330 * Outputs:
331 * *value the integer representation of the environment variable 'match'
332 * Returns:
333 * Zero on success, a kdb diagnostic on failure.
334 */
335int kdbgetintenv(const char *match, int *value)
336{
337 unsigned long val;
338 int diag;
339
340 diag = kdbgetulenv(match, &val);
341 if (!diag)
342 *value = (int) val;
343 return diag;
344}
345
346/*
347 * kdb_setenv() - Alter an existing environment variable or create a new one.
348 * @var: Name of the variable
349 * @val: Value of the variable
350 *
351 * Return: Zero on success, a kdb diagnostic on failure.
352 */
353static int kdb_setenv(const char *var, const char *val)
354{
355 int i;
356 char *ep;
357 size_t varlen, vallen;
358
359 varlen = strlen(var);
360 vallen = strlen(val);
361 ep = kdballocenv(varlen + vallen + 2);
362 if (ep == (char *)0)
363 return KDB_ENVBUFFULL;
364
365 sprintf(ep, "%s=%s", var, val);
366
367 for (i = 0; i < __nenv; i++) {
368 if (__env[i]
369 && ((strncmp(__env[i], var, varlen) == 0)
370 && ((__env[i][varlen] == '\0')
371 || (__env[i][varlen] == '=')))) {
372 __env[i] = ep;
373 return 0;
374 }
375 }
376
377 /*
378 * Wasn't existing variable. Fit into slot.
379 */
380 for (i = 0; i < __nenv-1; i++) {
381 if (__env[i] == (char *)0) {
382 __env[i] = ep;
383 return 0;
384 }
385 }
386
387 return KDB_ENVFULL;
388}
389
390/*
391 * kdb_printenv() - Display the current environment variables.
392 */
393static void kdb_printenv(void)
394{
395 int i;
396
397 for (i = 0; i < __nenv; i++) {
398 if (__env[i])
399 kdb_printf("%s\n", __env[i]);
400 }
401}
402
403/*
404 * kdbgetularg - This function will convert a numeric string into an
405 * unsigned long value.
406 * Parameters:
407 * arg A character string representing a numeric value
408 * Outputs:
409 * *value the unsigned long representation of arg.
410 * Returns:
411 * Zero on success, a kdb diagnostic on failure.
412 */
413int kdbgetularg(const char *arg, unsigned long *value)
414{
415 char *endp;
416 unsigned long val;
417
418 val = simple_strtoul(arg, &endp, 0);
419
420 if (endp == arg) {
421 /*
422 * Also try base 16, for us folks too lazy to type the
423 * leading 0x...
424 */
425 val = simple_strtoul(arg, &endp, 16);
426 if (endp == arg)
427 return KDB_BADINT;
428 }
429
430 *value = val;
431
432 return 0;
433}
434
435int kdbgetu64arg(const char *arg, u64 *value)
436{
437 char *endp;
438 u64 val;
439
440 val = simple_strtoull(arg, &endp, 0);
441
442 if (endp == arg) {
443
444 val = simple_strtoull(arg, &endp, 16);
445 if (endp == arg)
446 return KDB_BADINT;
447 }
448
449 *value = val;
450
451 return 0;
452}
453
454/*
455 * kdb_set - This function implements the 'set' command. Alter an
456 * existing environment variable or create a new one.
457 */
458int kdb_set(int argc, const char **argv)
459{
460 /*
461 * we can be invoked two ways:
462 * set var=value argv[1]="var", argv[2]="value"
463 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
464 * - if the latter, shift 'em down.
465 */
466 if (argc == 3) {
467 argv[2] = argv[3];
468 argc--;
469 }
470
471 if (argc != 2)
472 return KDB_ARGCOUNT;
473
474 /*
475 * Censor sensitive variables
476 */
477 if (strcmp(argv[1], "PROMPT") == 0 &&
478 !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
479 return KDB_NOPERM;
480
481 /*
482 * Check for internal variables
483 */
484 if (strcmp(argv[1], "KDBDEBUG") == 0) {
485 unsigned int debugflags;
486 char *cp;
487
488 debugflags = simple_strtoul(argv[2], &cp, 0);
489 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
490 kdb_printf("kdb: illegal debug flags '%s'\n",
491 argv[2]);
492 return 0;
493 }
494 kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK))
495 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
496
497 return 0;
498 }
499
500 /*
501 * Tokenizer squashed the '=' sign. argv[1] is variable
502 * name, argv[2] = value.
503 */
504 return kdb_setenv(argv[1], argv[2]);
505}
506
507static int kdb_check_regs(void)
508{
509 if (!kdb_current_regs) {
510 kdb_printf("No current kdb registers."
511 " You may need to select another task\n");
512 return KDB_BADREG;
513 }
514 return 0;
515}
516
517/*
518 * kdbgetaddrarg - This function is responsible for parsing an
519 * address-expression and returning the value of the expression,
520 * symbol name, and offset to the caller.
521 *
522 * The argument may consist of a numeric value (decimal or
523 * hexadecimal), a symbol name, a register name (preceded by the
524 * percent sign), an environment variable with a numeric value
525 * (preceded by a dollar sign) or a simple arithmetic expression
526 * consisting of a symbol name, +/-, and a numeric constant value
527 * (offset).
528 * Parameters:
529 * argc - count of arguments in argv
530 * argv - argument vector
531 * *nextarg - index to next unparsed argument in argv[]
532 * regs - Register state at time of KDB entry
533 * Outputs:
534 * *value - receives the value of the address-expression
535 * *offset - receives the offset specified, if any
536 * *name - receives the symbol name, if any
537 * *nextarg - index to next unparsed argument in argv[]
538 * Returns:
539 * zero is returned on success, a kdb diagnostic code is
540 * returned on error.
541 */
542int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
543 unsigned long *value, long *offset,
544 char **name)
545{
546 unsigned long addr;
547 unsigned long off = 0;
548 int positive;
549 int diag;
550 int found = 0;
551 char *symname;
552 char symbol = '\0';
553 char *cp;
554 kdb_symtab_t symtab;
555
556 /*
557 * If the enable flags prohibit both arbitrary memory access
558 * and flow control then there are no reasonable grounds to
559 * provide symbol lookup.
560 */
561 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
562 kdb_cmd_enabled, false))
563 return KDB_NOPERM;
564
565 /*
566 * Process arguments which follow the following syntax:
567 *
568 * symbol | numeric-address [+/- numeric-offset]
569 * %register
570 * $environment-variable
571 */
572
573 if (*nextarg > argc)
574 return KDB_ARGCOUNT;
575
576 symname = (char *)argv[*nextarg];
577
578 /*
579 * If there is no whitespace between the symbol
580 * or address and the '+' or '-' symbols, we
581 * remember the character and replace it with a
582 * null so the symbol/value can be properly parsed
583 */
584 cp = strpbrk(symname, "+-");
585 if (cp != NULL) {
586 symbol = *cp;
587 *cp++ = '\0';
588 }
589
590 if (symname[0] == '$') {
591 diag = kdbgetulenv(&symname[1], &addr);
592 if (diag)
593 return diag;
594 } else if (symname[0] == '%') {
595 diag = kdb_check_regs();
596 if (diag)
597 return diag;
598 /* Implement register values with % at a later time as it is
599 * arch optional.
600 */
601 return KDB_NOTIMP;
602 } else {
603 found = kdbgetsymval(symname, &symtab);
604 if (found) {
605 addr = symtab.sym_start;
606 } else {
607 diag = kdbgetularg(argv[*nextarg], &addr);
608 if (diag)
609 return diag;
610 }
611 }
612
613 if (!found)
614 found = kdbnearsym(addr, &symtab);
615
616 (*nextarg)++;
617
618 if (name)
619 *name = symname;
620 if (value)
621 *value = addr;
622 if (offset && name && *name)
623 *offset = addr - symtab.sym_start;
624
625 if ((*nextarg > argc)
626 && (symbol == '\0'))
627 return 0;
628
629 /*
630 * check for +/- and offset
631 */
632
633 if (symbol == '\0') {
634 if ((argv[*nextarg][0] != '+')
635 && (argv[*nextarg][0] != '-')) {
636 /*
637 * Not our argument. Return.
638 */
639 return 0;
640 } else {
641 positive = (argv[*nextarg][0] == '+');
642 (*nextarg)++;
643 }
644 } else
645 positive = (symbol == '+');
646
647 /*
648 * Now there must be an offset!
649 */
650 if ((*nextarg > argc)
651 && (symbol == '\0')) {
652 return KDB_INVADDRFMT;
653 }
654
655 if (!symbol) {
656 cp = (char *)argv[*nextarg];
657 (*nextarg)++;
658 }
659
660 diag = kdbgetularg(cp, &off);
661 if (diag)
662 return diag;
663
664 if (!positive)
665 off = -off;
666
667 if (offset)
668 *offset += off;
669
670 if (value)
671 *value += off;
672
673 return 0;
674}
675
676static void kdb_cmderror(int diag)
677{
678 int i;
679
680 if (diag >= 0) {
681 kdb_printf("no error detected (diagnostic is %d)\n", diag);
682 return;
683 }
684
685 for (i = 0; i < __nkdb_err; i++) {
686 if (kdbmsgs[i].km_diag == diag) {
687 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
688 return;
689 }
690 }
691
692 kdb_printf("Unknown diag %d\n", -diag);
693}
694
695/*
696 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
697 * command which defines one command as a set of other commands,
698 * terminated by endefcmd. kdb_defcmd processes the initial
699 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
700 * the following commands until 'endefcmd'.
701 * Inputs:
702 * argc argument count
703 * argv argument vector
704 * Returns:
705 * zero for success, a kdb diagnostic if error
706 */
707struct kdb_macro {
708 kdbtab_t cmd; /* Macro command */
709 struct list_head statements; /* Associated statement list */
710};
711
712struct kdb_macro_statement {
713 char *statement; /* Statement text */
714 struct list_head list_node; /* Statement list node */
715};
716
717static struct kdb_macro *kdb_macro;
718static bool defcmd_in_progress;
719
720/* Forward references */
721static int kdb_exec_defcmd(int argc, const char **argv);
722
723static int kdb_defcmd2(const char *cmdstr, const char *argv0)
724{
725 struct kdb_macro_statement *kms;
726
727 if (!kdb_macro)
728 return KDB_NOTIMP;
729
730 if (strcmp(argv0, "endefcmd") == 0) {
731 defcmd_in_progress = false;
732 if (!list_empty(&kdb_macro->statements))
733 kdb_register(&kdb_macro->cmd);
734 return 0;
735 }
736
737 kms = kmalloc(sizeof(*kms), GFP_KDB);
738 if (!kms) {
739 kdb_printf("Could not allocate new kdb macro command: %s\n",
740 cmdstr);
741 return KDB_NOTIMP;
742 }
743
744 kms->statement = kdb_strdup(cmdstr, GFP_KDB);
745 list_add_tail(&kms->list_node, &kdb_macro->statements);
746
747 return 0;
748}
749
750static int kdb_defcmd(int argc, const char **argv)
751{
752 kdbtab_t *mp;
753
754 if (defcmd_in_progress) {
755 kdb_printf("kdb: nested defcmd detected, assuming missing "
756 "endefcmd\n");
757 kdb_defcmd2("endefcmd", "endefcmd");
758 }
759 if (argc == 0) {
760 kdbtab_t *kp;
761 struct kdb_macro *kmp;
762 struct kdb_macro_statement *kms;
763
764 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
765 if (kp->func == kdb_exec_defcmd) {
766 kdb_printf("defcmd %s \"%s\" \"%s\"\n",
767 kp->name, kp->usage, kp->help);
768 kmp = container_of(kp, struct kdb_macro, cmd);
769 list_for_each_entry(kms, &kmp->statements,
770 list_node)
771 kdb_printf("%s", kms->statement);
772 kdb_printf("endefcmd\n");
773 }
774 }
775 return 0;
776 }
777 if (argc != 3)
778 return KDB_ARGCOUNT;
779 if (in_dbg_master()) {
780 kdb_printf("Command only available during kdb_init()\n");
781 return KDB_NOTIMP;
782 }
783 kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
784 if (!kdb_macro)
785 goto fail_defcmd;
786
787 mp = &kdb_macro->cmd;
788 mp->func = kdb_exec_defcmd;
789 mp->minlen = 0;
790 mp->flags = KDB_ENABLE_ALWAYS_SAFE;
791 mp->name = kdb_strdup(argv[1], GFP_KDB);
792 if (!mp->name)
793 goto fail_name;
794 mp->usage = kdb_strdup(argv[2], GFP_KDB);
795 if (!mp->usage)
796 goto fail_usage;
797 mp->help = kdb_strdup(argv[3], GFP_KDB);
798 if (!mp->help)
799 goto fail_help;
800 if (mp->usage[0] == '"') {
801 strcpy(mp->usage, argv[2]+1);
802 mp->usage[strlen(mp->usage)-1] = '\0';
803 }
804 if (mp->help[0] == '"') {
805 strcpy(mp->help, argv[3]+1);
806 mp->help[strlen(mp->help)-1] = '\0';
807 }
808
809 INIT_LIST_HEAD(&kdb_macro->statements);
810 defcmd_in_progress = true;
811 return 0;
812fail_help:
813 kfree(mp->usage);
814fail_usage:
815 kfree(mp->name);
816fail_name:
817 kfree(kdb_macro);
818fail_defcmd:
819 kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
820 return KDB_NOTIMP;
821}
822
823/*
824 * kdb_exec_defcmd - Execute the set of commands associated with this
825 * defcmd name.
826 * Inputs:
827 * argc argument count
828 * argv argument vector
829 * Returns:
830 * zero for success, a kdb diagnostic if error
831 */
832static int kdb_exec_defcmd(int argc, const char **argv)
833{
834 int ret;
835 kdbtab_t *kp;
836 struct kdb_macro *kmp;
837 struct kdb_macro_statement *kms;
838
839 if (argc != 0)
840 return KDB_ARGCOUNT;
841
842 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
843 if (strcmp(kp->name, argv[0]) == 0)
844 break;
845 }
846 if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
847 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
848 argv[0]);
849 return KDB_NOTIMP;
850 }
851 kmp = container_of(kp, struct kdb_macro, cmd);
852 list_for_each_entry(kms, &kmp->statements, list_node) {
853 /*
854 * Recursive use of kdb_parse, do not use argv after this point.
855 */
856 argv = NULL;
857 kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
858 ret = kdb_parse(kms->statement);
859 if (ret)
860 return ret;
861 }
862 return 0;
863}
864
865/* Command history */
866#define KDB_CMD_HISTORY_COUNT 32
867#define CMD_BUFLEN 200 /* kdb_printf: max printline
868 * size == 256 */
869static unsigned int cmd_head, cmd_tail;
870static unsigned int cmdptr;
871static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
872static char cmd_cur[CMD_BUFLEN];
873
874/*
875 * The "str" argument may point to something like | grep xyz
876 */
877static void parse_grep(const char *str)
878{
879 int len;
880 char *cp = (char *)str, *cp2;
881
882 /* sanity check: we should have been called with the \ first */
883 if (*cp != '|')
884 return;
885 cp++;
886 while (isspace(*cp))
887 cp++;
888 if (!str_has_prefix(cp, "grep ")) {
889 kdb_printf("invalid 'pipe', see grephelp\n");
890 return;
891 }
892 cp += 5;
893 while (isspace(*cp))
894 cp++;
895 cp2 = strchr(cp, '\n');
896 if (cp2)
897 *cp2 = '\0'; /* remove the trailing newline */
898 len = strlen(cp);
899 if (len == 0) {
900 kdb_printf("invalid 'pipe', see grephelp\n");
901 return;
902 }
903 /* now cp points to a nonzero length search string */
904 if (*cp == '"') {
905 /* allow it be "x y z" by removing the "'s - there must
906 be two of them */
907 cp++;
908 cp2 = strchr(cp, '"');
909 if (!cp2) {
910 kdb_printf("invalid quoted string, see grephelp\n");
911 return;
912 }
913 *cp2 = '\0'; /* end the string where the 2nd " was */
914 }
915 kdb_grep_leading = 0;
916 if (*cp == '^') {
917 kdb_grep_leading = 1;
918 cp++;
919 }
920 len = strlen(cp);
921 kdb_grep_trailing = 0;
922 if (*(cp+len-1) == '$') {
923 kdb_grep_trailing = 1;
924 *(cp+len-1) = '\0';
925 }
926 len = strlen(cp);
927 if (!len)
928 return;
929 if (len >= KDB_GREP_STRLEN) {
930 kdb_printf("search string too long\n");
931 return;
932 }
933 strcpy(kdb_grep_string, cp);
934 kdb_grepping_flag++;
935 return;
936}
937
938/*
939 * kdb_parse - Parse the command line, search the command table for a
940 * matching command and invoke the command function. This
941 * function may be called recursively, if it is, the second call
942 * will overwrite argv and cbuf. It is the caller's
943 * responsibility to save their argv if they recursively call
944 * kdb_parse().
945 * Parameters:
946 * cmdstr The input command line to be parsed.
947 * regs The registers at the time kdb was entered.
948 * Returns:
949 * Zero for success, a kdb diagnostic if failure.
950 * Remarks:
951 * Limited to 20 tokens.
952 *
953 * Real rudimentary tokenization. Basically only whitespace
954 * is considered a token delimiter (but special consideration
955 * is taken of the '=' sign as used by the 'set' command).
956 *
957 * The algorithm used to tokenize the input string relies on
958 * there being at least one whitespace (or otherwise useless)
959 * character between tokens as the character immediately following
960 * the token is altered in-place to a null-byte to terminate the
961 * token string.
962 */
963
964#define MAXARGC 20
965
966int kdb_parse(const char *cmdstr)
967{
968 static char *argv[MAXARGC];
969 static int argc;
970 static char cbuf[CMD_BUFLEN+2];
971 char *cp;
972 char *cpp, quoted;
973 kdbtab_t *tp;
974 int escaped, ignore_errors = 0, check_grep = 0;
975
976 /*
977 * First tokenize the command string.
978 */
979 cp = (char *)cmdstr;
980
981 if (KDB_FLAG(CMD_INTERRUPT)) {
982 /* Previous command was interrupted, newline must not
983 * repeat the command */
984 KDB_FLAG_CLEAR(CMD_INTERRUPT);
985 KDB_STATE_SET(PAGER);
986 argc = 0; /* no repeat */
987 }
988
989 if (*cp != '\n' && *cp != '\0') {
990 argc = 0;
991 cpp = cbuf;
992 while (*cp) {
993 /* skip whitespace */
994 while (isspace(*cp))
995 cp++;
996 if ((*cp == '\0') || (*cp == '\n') ||
997 (*cp == '#' && !defcmd_in_progress))
998 break;
999 /* special case: check for | grep pattern */
1000 if (*cp == '|') {
1001 check_grep++;
1002 break;
1003 }
1004 if (cpp >= cbuf + CMD_BUFLEN) {
1005 kdb_printf("kdb_parse: command buffer "
1006 "overflow, command ignored\n%s\n",
1007 cmdstr);
1008 return KDB_NOTFOUND;
1009 }
1010 if (argc >= MAXARGC - 1) {
1011 kdb_printf("kdb_parse: too many arguments, "
1012 "command ignored\n%s\n", cmdstr);
1013 return KDB_NOTFOUND;
1014 }
1015 argv[argc++] = cpp;
1016 escaped = 0;
1017 quoted = '\0';
1018 /* Copy to next unquoted and unescaped
1019 * whitespace or '=' */
1020 while (*cp && *cp != '\n' &&
1021 (escaped || quoted || !isspace(*cp))) {
1022 if (cpp >= cbuf + CMD_BUFLEN)
1023 break;
1024 if (escaped) {
1025 escaped = 0;
1026 *cpp++ = *cp++;
1027 continue;
1028 }
1029 if (*cp == '\\') {
1030 escaped = 1;
1031 ++cp;
1032 continue;
1033 }
1034 if (*cp == quoted)
1035 quoted = '\0';
1036 else if (*cp == '\'' || *cp == '"')
1037 quoted = *cp;
1038 *cpp = *cp++;
1039 if (*cpp == '=' && !quoted)
1040 break;
1041 ++cpp;
1042 }
1043 *cpp++ = '\0'; /* Squash a ws or '=' character */
1044 }
1045 }
1046 if (!argc)
1047 return 0;
1048 if (check_grep)
1049 parse_grep(cp);
1050 if (defcmd_in_progress) {
1051 int result = kdb_defcmd2(cmdstr, argv[0]);
1052 if (!defcmd_in_progress) {
1053 argc = 0; /* avoid repeat on endefcmd */
1054 *(argv[0]) = '\0';
1055 }
1056 return result;
1057 }
1058 if (argv[0][0] == '-' && argv[0][1] &&
1059 (argv[0][1] < '0' || argv[0][1] > '9')) {
1060 ignore_errors = 1;
1061 ++argv[0];
1062 }
1063
1064 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1065 /*
1066 * If this command is allowed to be abbreviated,
1067 * check to see if this is it.
1068 */
1069 if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
1070 (strncmp(argv[0], tp->name, tp->minlen) == 0))
1071 break;
1072
1073 if (strcmp(argv[0], tp->name) == 0)
1074 break;
1075 }
1076
1077 /*
1078 * If we don't find a command by this name, see if the first
1079 * few characters of this match any of the known commands.
1080 * e.g., md1c20 should match md.
1081 */
1082 if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1083 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1084 if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
1085 break;
1086 }
1087 }
1088
1089 if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1090 int result;
1091
1092 if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
1093 return KDB_NOPERM;
1094
1095 KDB_STATE_SET(CMD);
1096 result = (*tp->func)(argc-1, (const char **)argv);
1097 if (result && ignore_errors && result > KDB_CMD_GO)
1098 result = 0;
1099 KDB_STATE_CLEAR(CMD);
1100
1101 if (tp->flags & KDB_REPEAT_WITH_ARGS)
1102 return result;
1103
1104 argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1105 if (argv[argc])
1106 *(argv[argc]) = '\0';
1107 return result;
1108 }
1109
1110 /*
1111 * If the input with which we were presented does not
1112 * map to an existing command, attempt to parse it as an
1113 * address argument and display the result. Useful for
1114 * obtaining the address of a variable, or the nearest symbol
1115 * to an address contained in a register.
1116 */
1117 {
1118 unsigned long value;
1119 char *name = NULL;
1120 long offset;
1121 int nextarg = 0;
1122
1123 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1124 &value, &offset, &name)) {
1125 return KDB_NOTFOUND;
1126 }
1127
1128 kdb_printf("%s = ", argv[0]);
1129 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1130 kdb_printf("\n");
1131 return 0;
1132 }
1133}
1134
1135
1136static int handle_ctrl_cmd(char *cmd)
1137{
1138#define CTRL_P 16
1139#define CTRL_N 14
1140
1141 /* initial situation */
1142 if (cmd_head == cmd_tail)
1143 return 0;
1144 switch (*cmd) {
1145 case CTRL_P:
1146 if (cmdptr != cmd_tail)
1147 cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
1148 KDB_CMD_HISTORY_COUNT;
1149 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1150 return 1;
1151 case CTRL_N:
1152 if (cmdptr != cmd_head)
1153 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1154 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1155 return 1;
1156 }
1157 return 0;
1158}
1159
1160/*
1161 * kdb_reboot - This function implements the 'reboot' command. Reboot
1162 * the system immediately, or loop for ever on failure.
1163 */
1164static int kdb_reboot(int argc, const char **argv)
1165{
1166 emergency_restart();
1167 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1168 while (1)
1169 cpu_relax();
1170 /* NOTREACHED */
1171 return 0;
1172}
1173
1174static void kdb_dumpregs(struct pt_regs *regs)
1175{
1176 int old_lvl = console_loglevel;
1177 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1178 kdb_trap_printk++;
1179 show_regs(regs);
1180 kdb_trap_printk--;
1181 kdb_printf("\n");
1182 console_loglevel = old_lvl;
1183}
1184
1185static void kdb_set_current_task(struct task_struct *p)
1186{
1187 kdb_current_task = p;
1188
1189 if (kdb_task_has_cpu(p)) {
1190 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1191 return;
1192 }
1193 kdb_current_regs = NULL;
1194}
1195
1196static void drop_newline(char *buf)
1197{
1198 size_t len = strlen(buf);
1199
1200 if (len == 0)
1201 return;
1202 if (*(buf + len - 1) == '\n')
1203 *(buf + len - 1) = '\0';
1204}
1205
1206/*
1207 * kdb_local - The main code for kdb. This routine is invoked on a
1208 * specific processor, it is not global. The main kdb() routine
1209 * ensures that only one processor at a time is in this routine.
1210 * This code is called with the real reason code on the first
1211 * entry to a kdb session, thereafter it is called with reason
1212 * SWITCH, even if the user goes back to the original cpu.
1213 * Inputs:
1214 * reason The reason KDB was invoked
1215 * error The hardware-defined error code
1216 * regs The exception frame at time of fault/breakpoint.
1217 * db_result Result code from the break or debug point.
1218 * Returns:
1219 * 0 KDB was invoked for an event which it wasn't responsible
1220 * 1 KDB handled the event for which it was invoked.
1221 * KDB_CMD_GO User typed 'go'.
1222 * KDB_CMD_CPU User switched to another cpu.
1223 * KDB_CMD_SS Single step.
1224 */
1225static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1226 kdb_dbtrap_t db_result)
1227{
1228 char *cmdbuf;
1229 int diag;
1230 struct task_struct *kdb_current =
1231 kdb_curr_task(raw_smp_processor_id());
1232
1233 KDB_DEBUG_STATE("kdb_local 1", reason);
1234
1235 kdb_check_for_lockdown();
1236
1237 kdb_go_count = 0;
1238 if (reason == KDB_REASON_DEBUG) {
1239 /* special case below */
1240 } else {
1241 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1242 kdb_current, kdb_current ? kdb_current->pid : 0);
1243#if defined(CONFIG_SMP)
1244 kdb_printf("on processor %d ", raw_smp_processor_id());
1245#endif
1246 }
1247
1248 switch (reason) {
1249 case KDB_REASON_DEBUG:
1250 {
1251 /*
1252 * If re-entering kdb after a single step
1253 * command, don't print the message.
1254 */
1255 switch (db_result) {
1256 case KDB_DB_BPT:
1257 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1258 kdb_current, kdb_current->pid);
1259#if defined(CONFIG_SMP)
1260 kdb_printf("on processor %d ", raw_smp_processor_id());
1261#endif
1262 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1263 instruction_pointer(regs));
1264 break;
1265 case KDB_DB_SS:
1266 break;
1267 case KDB_DB_SSBPT:
1268 KDB_DEBUG_STATE("kdb_local 4", reason);
1269 return 1; /* kdba_db_trap did the work */
1270 default:
1271 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1272 db_result);
1273 break;
1274 }
1275
1276 }
1277 break;
1278 case KDB_REASON_ENTER:
1279 if (KDB_STATE(KEYBOARD))
1280 kdb_printf("due to Keyboard Entry\n");
1281 else
1282 kdb_printf("due to KDB_ENTER()\n");
1283 break;
1284 case KDB_REASON_KEYBOARD:
1285 KDB_STATE_SET(KEYBOARD);
1286 kdb_printf("due to Keyboard Entry\n");
1287 break;
1288 case KDB_REASON_ENTER_SLAVE:
1289 /* drop through, slaves only get released via cpu switch */
1290 case KDB_REASON_SWITCH:
1291 kdb_printf("due to cpu switch\n");
1292 break;
1293 case KDB_REASON_OOPS:
1294 kdb_printf("Oops: %s\n", kdb_diemsg);
1295 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1296 instruction_pointer(regs));
1297 kdb_dumpregs(regs);
1298 break;
1299 case KDB_REASON_SYSTEM_NMI:
1300 kdb_printf("due to System NonMaskable Interrupt\n");
1301 break;
1302 case KDB_REASON_NMI:
1303 kdb_printf("due to NonMaskable Interrupt @ "
1304 kdb_machreg_fmt "\n",
1305 instruction_pointer(regs));
1306 break;
1307 case KDB_REASON_SSTEP:
1308 case KDB_REASON_BREAK:
1309 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1310 reason == KDB_REASON_BREAK ?
1311 "Breakpoint" : "SS trap", instruction_pointer(regs));
1312 /*
1313 * Determine if this breakpoint is one that we
1314 * are interested in.
1315 */
1316 if (db_result != KDB_DB_BPT) {
1317 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1318 db_result);
1319 KDB_DEBUG_STATE("kdb_local 6", reason);
1320 return 0; /* Not for us, dismiss it */
1321 }
1322 break;
1323 case KDB_REASON_RECURSE:
1324 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1325 instruction_pointer(regs));
1326 break;
1327 default:
1328 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1329 KDB_DEBUG_STATE("kdb_local 8", reason);
1330 return 0; /* Not for us, dismiss it */
1331 }
1332
1333 while (1) {
1334 /*
1335 * Initialize pager context.
1336 */
1337 kdb_nextline = 1;
1338 KDB_STATE_CLEAR(SUPPRESS);
1339 kdb_grepping_flag = 0;
1340 /* ensure the old search does not leak into '/' commands */
1341 kdb_grep_string[0] = '\0';
1342
1343 cmdbuf = cmd_cur;
1344 *cmdbuf = '\0';
1345 *(cmd_hist[cmd_head]) = '\0';
1346
1347do_full_getstr:
1348 /* PROMPT can only be set if we have MEM_READ permission. */
1349 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1350 raw_smp_processor_id());
1351
1352 /*
1353 * Fetch command from keyboard
1354 */
1355 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1356 if (*cmdbuf != '\n') {
1357 if (*cmdbuf < 32) {
1358 if (cmdptr == cmd_head) {
1359 strscpy(cmd_hist[cmd_head], cmd_cur,
1360 CMD_BUFLEN);
1361 *(cmd_hist[cmd_head] +
1362 strlen(cmd_hist[cmd_head])-1) = '\0';
1363 }
1364 if (!handle_ctrl_cmd(cmdbuf))
1365 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1366 cmdbuf = cmd_cur;
1367 goto do_full_getstr;
1368 } else {
1369 strscpy(cmd_hist[cmd_head], cmd_cur,
1370 CMD_BUFLEN);
1371 }
1372
1373 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1374 if (cmd_head == cmd_tail)
1375 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1376 }
1377
1378 cmdptr = cmd_head;
1379 diag = kdb_parse(cmdbuf);
1380 if (diag == KDB_NOTFOUND) {
1381 drop_newline(cmdbuf);
1382 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1383 diag = 0;
1384 }
1385 if (diag == KDB_CMD_GO
1386 || diag == KDB_CMD_CPU
1387 || diag == KDB_CMD_SS
1388 || diag == KDB_CMD_KGDB)
1389 break;
1390
1391 if (diag)
1392 kdb_cmderror(diag);
1393 }
1394 KDB_DEBUG_STATE("kdb_local 9", diag);
1395 return diag;
1396}
1397
1398
1399/*
1400 * kdb_print_state - Print the state data for the current processor
1401 * for debugging.
1402 * Inputs:
1403 * text Identifies the debug point
1404 * value Any integer value to be printed, e.g. reason code.
1405 */
1406void kdb_print_state(const char *text, int value)
1407{
1408 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1409 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1410 kdb_state);
1411}
1412
1413/*
1414 * kdb_main_loop - After initial setup and assignment of the
1415 * controlling cpu, all cpus are in this loop. One cpu is in
1416 * control and will issue the kdb prompt, the others will spin
1417 * until 'go' or cpu switch.
1418 *
1419 * To get a consistent view of the kernel stacks for all
1420 * processes, this routine is invoked from the main kdb code via
1421 * an architecture specific routine. kdba_main_loop is
1422 * responsible for making the kernel stacks consistent for all
1423 * processes, there should be no difference between a blocked
1424 * process and a running process as far as kdb is concerned.
1425 * Inputs:
1426 * reason The reason KDB was invoked
1427 * error The hardware-defined error code
1428 * reason2 kdb's current reason code.
1429 * Initially error but can change
1430 * according to kdb state.
1431 * db_result Result code from break or debug point.
1432 * regs The exception frame at time of fault/breakpoint.
1433 * should always be valid.
1434 * Returns:
1435 * 0 KDB was invoked for an event which it wasn't responsible
1436 * 1 KDB handled the event for which it was invoked.
1437 */
1438int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1439 kdb_dbtrap_t db_result, struct pt_regs *regs)
1440{
1441 int result = 1;
1442 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1443 while (1) {
1444 /*
1445 * All processors except the one that is in control
1446 * will spin here.
1447 */
1448 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1449 while (KDB_STATE(HOLD_CPU)) {
1450 /* state KDB is turned off by kdb_cpu to see if the
1451 * other cpus are still live, each cpu in this loop
1452 * turns it back on.
1453 */
1454 if (!KDB_STATE(KDB))
1455 KDB_STATE_SET(KDB);
1456 }
1457
1458 KDB_STATE_CLEAR(SUPPRESS);
1459 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1460 if (KDB_STATE(LEAVING))
1461 break; /* Another cpu said 'go' */
1462 /* Still using kdb, this processor is in control */
1463 result = kdb_local(reason2, error, regs, db_result);
1464 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1465
1466 if (result == KDB_CMD_CPU)
1467 break;
1468
1469 if (result == KDB_CMD_SS) {
1470 KDB_STATE_SET(DOING_SS);
1471 break;
1472 }
1473
1474 if (result == KDB_CMD_KGDB) {
1475 if (!KDB_STATE(DOING_KGDB))
1476 kdb_printf("Entering please attach debugger "
1477 "or use $D#44+ or $3#33\n");
1478 break;
1479 }
1480 if (result && result != 1 && result != KDB_CMD_GO)
1481 kdb_printf("\nUnexpected kdb_local return code %d\n",
1482 result);
1483 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1484 break;
1485 }
1486 if (KDB_STATE(DOING_SS))
1487 KDB_STATE_CLEAR(SSBPT);
1488
1489 /* Clean up any keyboard devices before leaving */
1490 kdb_kbd_cleanup_state();
1491
1492 return result;
1493}
1494
1495/*
1496 * kdb_mdr - This function implements the guts of the 'mdr', memory
1497 * read command.
1498 * mdr <addr arg>,<byte count>
1499 * Inputs:
1500 * addr Start address
1501 * count Number of bytes
1502 * Returns:
1503 * Always 0. Any errors are detected and printed by kdb_getarea.
1504 */
1505static int kdb_mdr(unsigned long addr, unsigned int count)
1506{
1507 unsigned char c;
1508 while (count--) {
1509 if (kdb_getarea(c, addr))
1510 return 0;
1511 kdb_printf("%02x", c);
1512 addr++;
1513 }
1514 kdb_printf("\n");
1515 return 0;
1516}
1517
1518/*
1519 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1520 * 'md8' 'mdr' and 'mds' commands.
1521 *
1522 * md|mds [<addr arg> [<line count> [<radix>]]]
1523 * mdWcN [<addr arg> [<line count> [<radix>]]]
1524 * where W = is the width (1, 2, 4 or 8) and N is the count.
1525 * for eg., md1c20 reads 20 bytes, 1 at a time.
1526 * mdr <addr arg>,<byte count>
1527 */
1528static void kdb_md_line(const char *fmtstr, unsigned long addr,
1529 int symbolic, int nosect, int bytesperword,
1530 int num, int repeat, int phys)
1531{
1532 /* print just one line of data */
1533 kdb_symtab_t symtab;
1534 char cbuf[32];
1535 char *c = cbuf;
1536 int i;
1537 int j;
1538 unsigned long word;
1539
1540 memset(cbuf, '\0', sizeof(cbuf));
1541 if (phys)
1542 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1543 else
1544 kdb_printf(kdb_machreg_fmt0 " ", addr);
1545
1546 for (i = 0; i < num && repeat--; i++) {
1547 if (phys) {
1548 if (kdb_getphysword(&word, addr, bytesperword))
1549 break;
1550 } else if (kdb_getword(&word, addr, bytesperword))
1551 break;
1552 kdb_printf(fmtstr, word);
1553 if (symbolic)
1554 kdbnearsym(word, &symtab);
1555 else
1556 memset(&symtab, 0, sizeof(symtab));
1557 if (symtab.sym_name) {
1558 kdb_symbol_print(word, &symtab, 0);
1559 if (!nosect) {
1560 kdb_printf("\n");
1561 kdb_printf(" %s %s "
1562 kdb_machreg_fmt " "
1563 kdb_machreg_fmt " "
1564 kdb_machreg_fmt, symtab.mod_name,
1565 symtab.sec_name, symtab.sec_start,
1566 symtab.sym_start, symtab.sym_end);
1567 }
1568 addr += bytesperword;
1569 } else {
1570 union {
1571 u64 word;
1572 unsigned char c[8];
1573 } wc;
1574 unsigned char *cp;
1575#ifdef __BIG_ENDIAN
1576 cp = wc.c + 8 - bytesperword;
1577#else
1578 cp = wc.c;
1579#endif
1580 wc.word = word;
1581#define printable_char(c) \
1582 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1583 for (j = 0; j < bytesperword; j++)
1584 *c++ = printable_char(*cp++);
1585 addr += bytesperword;
1586#undef printable_char
1587 }
1588 }
1589 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1590 " ", cbuf);
1591}
1592
1593static int kdb_md(int argc, const char **argv)
1594{
1595 static unsigned long last_addr;
1596 static int last_radix, last_bytesperword, last_repeat;
1597 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1598 int nosect = 0;
1599 char fmtchar, fmtstr[64];
1600 unsigned long addr;
1601 unsigned long word;
1602 long offset = 0;
1603 int symbolic = 0;
1604 int valid = 0;
1605 int phys = 0;
1606 int raw = 0;
1607
1608 kdbgetintenv("MDCOUNT", &mdcount);
1609 kdbgetintenv("RADIX", &radix);
1610 kdbgetintenv("BYTESPERWORD", &bytesperword);
1611
1612 /* Assume 'md <addr>' and start with environment values */
1613 repeat = mdcount * 16 / bytesperword;
1614
1615 if (strcmp(argv[0], "mdr") == 0) {
1616 if (argc == 2 || (argc == 0 && last_addr != 0))
1617 valid = raw = 1;
1618 else
1619 return KDB_ARGCOUNT;
1620 } else if (isdigit(argv[0][2])) {
1621 bytesperword = (int)(argv[0][2] - '0');
1622 if (bytesperword == 0) {
1623 bytesperword = last_bytesperword;
1624 if (bytesperword == 0)
1625 bytesperword = 4;
1626 }
1627 last_bytesperword = bytesperword;
1628 repeat = mdcount * 16 / bytesperword;
1629 if (!argv[0][3])
1630 valid = 1;
1631 else if (argv[0][3] == 'c' && argv[0][4]) {
1632 char *p;
1633 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1634 mdcount = ((repeat * bytesperword) + 15) / 16;
1635 valid = !*p;
1636 }
1637 last_repeat = repeat;
1638 } else if (strcmp(argv[0], "md") == 0)
1639 valid = 1;
1640 else if (strcmp(argv[0], "mds") == 0)
1641 valid = 1;
1642 else if (strcmp(argv[0], "mdp") == 0) {
1643 phys = valid = 1;
1644 }
1645 if (!valid)
1646 return KDB_NOTFOUND;
1647
1648 if (argc == 0) {
1649 if (last_addr == 0)
1650 return KDB_ARGCOUNT;
1651 addr = last_addr;
1652 radix = last_radix;
1653 bytesperword = last_bytesperword;
1654 repeat = last_repeat;
1655 if (raw)
1656 mdcount = repeat;
1657 else
1658 mdcount = ((repeat * bytesperword) + 15) / 16;
1659 }
1660
1661 if (argc) {
1662 unsigned long val;
1663 int diag, nextarg = 1;
1664 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1665 &offset, NULL);
1666 if (diag)
1667 return diag;
1668 if (argc > nextarg+2)
1669 return KDB_ARGCOUNT;
1670
1671 if (argc >= nextarg) {
1672 diag = kdbgetularg(argv[nextarg], &val);
1673 if (!diag) {
1674 mdcount = (int) val;
1675 if (raw)
1676 repeat = mdcount;
1677 else
1678 repeat = mdcount * 16 / bytesperword;
1679 }
1680 }
1681 if (argc >= nextarg+1) {
1682 diag = kdbgetularg(argv[nextarg+1], &val);
1683 if (!diag)
1684 radix = (int) val;
1685 }
1686 }
1687
1688 if (strcmp(argv[0], "mdr") == 0) {
1689 int ret;
1690 last_addr = addr;
1691 ret = kdb_mdr(addr, mdcount);
1692 last_addr += mdcount;
1693 last_repeat = mdcount;
1694 last_bytesperword = bytesperword; // to make REPEAT happy
1695 return ret;
1696 }
1697
1698 switch (radix) {
1699 case 10:
1700 fmtchar = 'd';
1701 break;
1702 case 16:
1703 fmtchar = 'x';
1704 break;
1705 case 8:
1706 fmtchar = 'o';
1707 break;
1708 default:
1709 return KDB_BADRADIX;
1710 }
1711
1712 last_radix = radix;
1713
1714 if (bytesperword > KDB_WORD_SIZE)
1715 return KDB_BADWIDTH;
1716
1717 switch (bytesperword) {
1718 case 8:
1719 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1720 break;
1721 case 4:
1722 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1723 break;
1724 case 2:
1725 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1726 break;
1727 case 1:
1728 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1729 break;
1730 default:
1731 return KDB_BADWIDTH;
1732 }
1733
1734 last_repeat = repeat;
1735 last_bytesperword = bytesperword;
1736
1737 if (strcmp(argv[0], "mds") == 0) {
1738 symbolic = 1;
1739 /* Do not save these changes as last_*, they are temporary mds
1740 * overrides.
1741 */
1742 bytesperword = KDB_WORD_SIZE;
1743 repeat = mdcount;
1744 kdbgetintenv("NOSECT", &nosect);
1745 }
1746
1747 /* Round address down modulo BYTESPERWORD */
1748
1749 addr &= ~(bytesperword-1);
1750
1751 while (repeat > 0) {
1752 unsigned long a;
1753 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1754
1755 if (KDB_FLAG(CMD_INTERRUPT))
1756 return 0;
1757 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1758 if (phys) {
1759 if (kdb_getphysword(&word, a, bytesperword)
1760 || word)
1761 break;
1762 } else if (kdb_getword(&word, a, bytesperword) || word)
1763 break;
1764 }
1765 n = min(num, repeat);
1766 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1767 num, repeat, phys);
1768 addr += bytesperword * n;
1769 repeat -= n;
1770 z = (z + num - 1) / num;
1771 if (z > 2) {
1772 int s = num * (z-2);
1773 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1774 " zero suppressed\n",
1775 addr, addr + bytesperword * s - 1);
1776 addr += bytesperword * s;
1777 repeat -= s;
1778 }
1779 }
1780 last_addr = addr;
1781
1782 return 0;
1783}
1784
1785/*
1786 * kdb_mm - This function implements the 'mm' command.
1787 * mm address-expression new-value
1788 * Remarks:
1789 * mm works on machine words, mmW works on bytes.
1790 */
1791static int kdb_mm(int argc, const char **argv)
1792{
1793 int diag;
1794 unsigned long addr;
1795 long offset = 0;
1796 unsigned long contents;
1797 int nextarg;
1798 int width;
1799
1800 if (argv[0][2] && !isdigit(argv[0][2]))
1801 return KDB_NOTFOUND;
1802
1803 if (argc < 2)
1804 return KDB_ARGCOUNT;
1805
1806 nextarg = 1;
1807 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1808 if (diag)
1809 return diag;
1810
1811 if (nextarg > argc)
1812 return KDB_ARGCOUNT;
1813 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1814 if (diag)
1815 return diag;
1816
1817 if (nextarg != argc + 1)
1818 return KDB_ARGCOUNT;
1819
1820 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1821 diag = kdb_putword(addr, contents, width);
1822 if (diag)
1823 return diag;
1824
1825 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1826
1827 return 0;
1828}
1829
1830/*
1831 * kdb_go - This function implements the 'go' command.
1832 * go [address-expression]
1833 */
1834static int kdb_go(int argc, const char **argv)
1835{
1836 unsigned long addr;
1837 int diag;
1838 int nextarg;
1839 long offset;
1840
1841 if (raw_smp_processor_id() != kdb_initial_cpu) {
1842 kdb_printf("go must execute on the entry cpu, "
1843 "please use \"cpu %d\" and then execute go\n",
1844 kdb_initial_cpu);
1845 return KDB_BADCPUNUM;
1846 }
1847 if (argc == 1) {
1848 nextarg = 1;
1849 diag = kdbgetaddrarg(argc, argv, &nextarg,
1850 &addr, &offset, NULL);
1851 if (diag)
1852 return diag;
1853 } else if (argc) {
1854 return KDB_ARGCOUNT;
1855 }
1856
1857 diag = KDB_CMD_GO;
1858 if (KDB_FLAG(CATASTROPHIC)) {
1859 kdb_printf("Catastrophic error detected\n");
1860 kdb_printf("kdb_continue_catastrophic=%d, ",
1861 kdb_continue_catastrophic);
1862 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1863 kdb_printf("type go a second time if you really want "
1864 "to continue\n");
1865 return 0;
1866 }
1867 if (kdb_continue_catastrophic == 2) {
1868 kdb_printf("forcing reboot\n");
1869 kdb_reboot(0, NULL);
1870 }
1871 kdb_printf("attempting to continue\n");
1872 }
1873 return diag;
1874}
1875
1876/*
1877 * kdb_rd - This function implements the 'rd' command.
1878 */
1879static int kdb_rd(int argc, const char **argv)
1880{
1881 int len = kdb_check_regs();
1882#if DBG_MAX_REG_NUM > 0
1883 int i;
1884 char *rname;
1885 int rsize;
1886 u64 reg64;
1887 u32 reg32;
1888 u16 reg16;
1889 u8 reg8;
1890
1891 if (len)
1892 return len;
1893
1894 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1895 rsize = dbg_reg_def[i].size * 2;
1896 if (rsize > 16)
1897 rsize = 2;
1898 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1899 len = 0;
1900 kdb_printf("\n");
1901 }
1902 if (len)
1903 len += kdb_printf(" ");
1904 switch(dbg_reg_def[i].size * 8) {
1905 case 8:
1906 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1907 if (!rname)
1908 break;
1909 len += kdb_printf("%s: %02x", rname, reg8);
1910 break;
1911 case 16:
1912 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1913 if (!rname)
1914 break;
1915 len += kdb_printf("%s: %04x", rname, reg16);
1916 break;
1917 case 32:
1918 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1919 if (!rname)
1920 break;
1921 len += kdb_printf("%s: %08x", rname, reg32);
1922 break;
1923 case 64:
1924 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1925 if (!rname)
1926 break;
1927 len += kdb_printf("%s: %016llx", rname, reg64);
1928 break;
1929 default:
1930 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1931 }
1932 }
1933 kdb_printf("\n");
1934#else
1935 if (len)
1936 return len;
1937
1938 kdb_dumpregs(kdb_current_regs);
1939#endif
1940 return 0;
1941}
1942
1943/*
1944 * kdb_rm - This function implements the 'rm' (register modify) command.
1945 * rm register-name new-contents
1946 * Remarks:
1947 * Allows register modification with the same restrictions as gdb
1948 */
1949static int kdb_rm(int argc, const char **argv)
1950{
1951#if DBG_MAX_REG_NUM > 0
1952 int diag;
1953 const char *rname;
1954 int i;
1955 u64 reg64;
1956 u32 reg32;
1957 u16 reg16;
1958 u8 reg8;
1959
1960 if (argc != 2)
1961 return KDB_ARGCOUNT;
1962 /*
1963 * Allow presence or absence of leading '%' symbol.
1964 */
1965 rname = argv[1];
1966 if (*rname == '%')
1967 rname++;
1968
1969 diag = kdbgetu64arg(argv[2], ®64);
1970 if (diag)
1971 return diag;
1972
1973 diag = kdb_check_regs();
1974 if (diag)
1975 return diag;
1976
1977 diag = KDB_BADREG;
1978 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1979 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1980 diag = 0;
1981 break;
1982 }
1983 }
1984 if (!diag) {
1985 switch(dbg_reg_def[i].size * 8) {
1986 case 8:
1987 reg8 = reg64;
1988 dbg_set_reg(i, ®8, kdb_current_regs);
1989 break;
1990 case 16:
1991 reg16 = reg64;
1992 dbg_set_reg(i, ®16, kdb_current_regs);
1993 break;
1994 case 32:
1995 reg32 = reg64;
1996 dbg_set_reg(i, ®32, kdb_current_regs);
1997 break;
1998 case 64:
1999 dbg_set_reg(i, ®64, kdb_current_regs);
2000 break;
2001 }
2002 }
2003 return diag;
2004#else
2005 kdb_printf("ERROR: Register set currently not implemented\n");
2006 return 0;
2007#endif
2008}
2009
2010#if defined(CONFIG_MAGIC_SYSRQ)
2011/*
2012 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
2013 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
2014 * sr <magic-sysrq-code>
2015 */
2016static int kdb_sr(int argc, const char **argv)
2017{
2018 bool check_mask =
2019 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
2020
2021 if (argc != 1)
2022 return KDB_ARGCOUNT;
2023
2024 kdb_trap_printk++;
2025 __handle_sysrq(*argv[1], check_mask);
2026 kdb_trap_printk--;
2027
2028 return 0;
2029}
2030#endif /* CONFIG_MAGIC_SYSRQ */
2031
2032/*
2033 * kdb_ef - This function implements the 'regs' (display exception
2034 * frame) command. This command takes an address and expects to
2035 * find an exception frame at that address, formats and prints
2036 * it.
2037 * regs address-expression
2038 * Remarks:
2039 * Not done yet.
2040 */
2041static int kdb_ef(int argc, const char **argv)
2042{
2043 int diag;
2044 unsigned long addr;
2045 long offset;
2046 int nextarg;
2047
2048 if (argc != 1)
2049 return KDB_ARGCOUNT;
2050
2051 nextarg = 1;
2052 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2053 if (diag)
2054 return diag;
2055 show_regs((struct pt_regs *)addr);
2056 return 0;
2057}
2058
2059/*
2060 * kdb_env - This function implements the 'env' command. Display the
2061 * current environment variables.
2062 */
2063
2064static int kdb_env(int argc, const char **argv)
2065{
2066 kdb_printenv();
2067
2068 if (KDB_DEBUG(MASK))
2069 kdb_printf("KDBDEBUG=0x%x\n",
2070 (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
2071
2072 return 0;
2073}
2074
2075#ifdef CONFIG_PRINTK
2076/*
2077 * kdb_dmesg - This function implements the 'dmesg' command to display
2078 * the contents of the syslog buffer.
2079 * dmesg [lines] [adjust]
2080 */
2081static int kdb_dmesg(int argc, const char **argv)
2082{
2083 int diag;
2084 int logging;
2085 int lines = 0;
2086 int adjust = 0;
2087 int n = 0;
2088 int skip = 0;
2089 struct kmsg_dump_iter iter;
2090 size_t len;
2091 char buf[201];
2092
2093 if (argc > 2)
2094 return KDB_ARGCOUNT;
2095 if (argc) {
2096 char *cp;
2097 lines = simple_strtol(argv[1], &cp, 0);
2098 if (*cp)
2099 lines = 0;
2100 if (argc > 1) {
2101 adjust = simple_strtoul(argv[2], &cp, 0);
2102 if (*cp || adjust < 0)
2103 adjust = 0;
2104 }
2105 }
2106
2107 /* disable LOGGING if set */
2108 diag = kdbgetintenv("LOGGING", &logging);
2109 if (!diag && logging) {
2110 const char *setargs[] = { "set", "LOGGING", "0" };
2111 kdb_set(2, setargs);
2112 }
2113
2114 kmsg_dump_rewind(&iter);
2115 while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL))
2116 n++;
2117
2118 if (lines < 0) {
2119 if (adjust >= n)
2120 kdb_printf("buffer only contains %d lines, nothing "
2121 "printed\n", n);
2122 else if (adjust - lines >= n)
2123 kdb_printf("buffer only contains %d lines, last %d "
2124 "lines printed\n", n, n - adjust);
2125 skip = adjust;
2126 lines = abs(lines);
2127 } else if (lines > 0) {
2128 skip = n - lines - adjust;
2129 lines = abs(lines);
2130 if (adjust >= n) {
2131 kdb_printf("buffer only contains %d lines, "
2132 "nothing printed\n", n);
2133 skip = n;
2134 } else if (skip < 0) {
2135 lines += skip;
2136 skip = 0;
2137 kdb_printf("buffer only contains %d lines, first "
2138 "%d lines printed\n", n, lines);
2139 }
2140 } else {
2141 lines = n;
2142 }
2143
2144 if (skip >= n || skip < 0)
2145 return 0;
2146
2147 kmsg_dump_rewind(&iter);
2148 while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) {
2149 if (skip) {
2150 skip--;
2151 continue;
2152 }
2153 if (!lines--)
2154 break;
2155 if (KDB_FLAG(CMD_INTERRUPT))
2156 return 0;
2157
2158 kdb_printf("%.*s\n", (int)len - 1, buf);
2159 }
2160
2161 return 0;
2162}
2163#endif /* CONFIG_PRINTK */
2164
2165/* Make sure we balance enable/disable calls, must disable first. */
2166static atomic_t kdb_nmi_disabled;
2167
2168static int kdb_disable_nmi(int argc, const char *argv[])
2169{
2170 if (atomic_read(&kdb_nmi_disabled))
2171 return 0;
2172 atomic_set(&kdb_nmi_disabled, 1);
2173 arch_kgdb_ops.enable_nmi(0);
2174 return 0;
2175}
2176
2177static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2178{
2179 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2180 return -EINVAL;
2181 arch_kgdb_ops.enable_nmi(1);
2182 return 0;
2183}
2184
2185static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2186 .set = kdb_param_enable_nmi,
2187};
2188module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2189
2190/*
2191 * kdb_cpu - This function implements the 'cpu' command.
2192 * cpu [<cpunum>]
2193 * Returns:
2194 * KDB_CMD_CPU for success, a kdb diagnostic if error
2195 */
2196static void kdb_cpu_status(void)
2197{
2198 int i, start_cpu, first_print = 1;
2199 char state, prev_state = '?';
2200
2201 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2202 kdb_printf("Available cpus: ");
2203 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2204 if (!cpu_online(i)) {
2205 state = 'F'; /* cpu is offline */
2206 } else if (!kgdb_info[i].enter_kgdb) {
2207 state = 'D'; /* cpu is online but unresponsive */
2208 } else {
2209 state = ' '; /* cpu is responding to kdb */
2210 if (kdb_task_state_char(KDB_TSK(i)) == '-')
2211 state = '-'; /* idle task */
2212 }
2213 if (state != prev_state) {
2214 if (prev_state != '?') {
2215 if (!first_print)
2216 kdb_printf(", ");
2217 first_print = 0;
2218 kdb_printf("%d", start_cpu);
2219 if (start_cpu < i-1)
2220 kdb_printf("-%d", i-1);
2221 if (prev_state != ' ')
2222 kdb_printf("(%c)", prev_state);
2223 }
2224 prev_state = state;
2225 start_cpu = i;
2226 }
2227 }
2228 /* print the trailing cpus, ignoring them if they are all offline */
2229 if (prev_state != 'F') {
2230 if (!first_print)
2231 kdb_printf(", ");
2232 kdb_printf("%d", start_cpu);
2233 if (start_cpu < i-1)
2234 kdb_printf("-%d", i-1);
2235 if (prev_state != ' ')
2236 kdb_printf("(%c)", prev_state);
2237 }
2238 kdb_printf("\n");
2239}
2240
2241static int kdb_cpu(int argc, const char **argv)
2242{
2243 unsigned long cpunum;
2244 int diag;
2245
2246 if (argc == 0) {
2247 kdb_cpu_status();
2248 return 0;
2249 }
2250
2251 if (argc != 1)
2252 return KDB_ARGCOUNT;
2253
2254 diag = kdbgetularg(argv[1], &cpunum);
2255 if (diag)
2256 return diag;
2257
2258 /*
2259 * Validate cpunum
2260 */
2261 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2262 return KDB_BADCPUNUM;
2263
2264 dbg_switch_cpu = cpunum;
2265
2266 /*
2267 * Switch to other cpu
2268 */
2269 return KDB_CMD_CPU;
2270}
2271
2272/* The user may not realize that ps/bta with no parameters does not print idle
2273 * or sleeping system daemon processes, so tell them how many were suppressed.
2274 */
2275void kdb_ps_suppressed(void)
2276{
2277 int idle = 0, daemon = 0;
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, "-"))
2283 ++idle;
2284 }
2285 for_each_process_thread(g, p) {
2286 if (kdb_task_state(p, "ims"))
2287 ++daemon;
2288 }
2289 if (idle || daemon) {
2290 if (idle)
2291 kdb_printf("%d idle process%s (state -)%s\n",
2292 idle, idle == 1 ? "" : "es",
2293 daemon ? " and " : "");
2294 if (daemon)
2295 kdb_printf("%d sleeping system daemon (state [ims]) "
2296 "process%s", daemon,
2297 daemon == 1 ? "" : "es");
2298 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2299 }
2300}
2301
2302void kdb_ps1(const struct task_struct *p)
2303{
2304 int cpu;
2305 unsigned long tmp;
2306
2307 if (!p ||
2308 copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
2309 return;
2310
2311 cpu = kdb_process_cpu(p);
2312 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2313 (void *)p, p->pid, p->parent->pid,
2314 kdb_task_has_cpu(p), kdb_process_cpu(p),
2315 kdb_task_state_char(p),
2316 (void *)(&p->thread),
2317 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2318 p->comm);
2319 if (kdb_task_has_cpu(p)) {
2320 if (!KDB_TSK(cpu)) {
2321 kdb_printf(" Error: no saved data for this cpu\n");
2322 } else {
2323 if (KDB_TSK(cpu) != p)
2324 kdb_printf(" Error: does not match running "
2325 "process table (0x%px)\n", KDB_TSK(cpu));
2326 }
2327 }
2328}
2329
2330/*
2331 * kdb_ps - This function implements the 'ps' command which shows a
2332 * list of the active processes.
2333 *
2334 * ps [<state_chars>] Show processes, optionally selecting only those whose
2335 * state character is found in <state_chars>.
2336 */
2337static int kdb_ps(int argc, const char **argv)
2338{
2339 struct task_struct *g, *p;
2340 const char *mask;
2341 unsigned long cpu;
2342
2343 if (argc == 0)
2344 kdb_ps_suppressed();
2345 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2346 (int)(2*sizeof(void *))+2, "Task Addr",
2347 (int)(2*sizeof(void *))+2, "Thread");
2348 mask = argc ? argv[1] : kdbgetenv("PS");
2349 /* Run the active tasks first */
2350 for_each_online_cpu(cpu) {
2351 if (KDB_FLAG(CMD_INTERRUPT))
2352 return 0;
2353 p = kdb_curr_task(cpu);
2354 if (kdb_task_state(p, mask))
2355 kdb_ps1(p);
2356 }
2357 kdb_printf("\n");
2358 /* Now the real tasks */
2359 for_each_process_thread(g, p) {
2360 if (KDB_FLAG(CMD_INTERRUPT))
2361 return 0;
2362 if (kdb_task_state(p, mask))
2363 kdb_ps1(p);
2364 }
2365
2366 return 0;
2367}
2368
2369/*
2370 * kdb_pid - This function implements the 'pid' command which switches
2371 * the currently active process.
2372 * pid [<pid> | R]
2373 */
2374static int kdb_pid(int argc, const char **argv)
2375{
2376 struct task_struct *p;
2377 unsigned long val;
2378 int diag;
2379
2380 if (argc > 1)
2381 return KDB_ARGCOUNT;
2382
2383 if (argc) {
2384 if (strcmp(argv[1], "R") == 0) {
2385 p = KDB_TSK(kdb_initial_cpu);
2386 } else {
2387 diag = kdbgetularg(argv[1], &val);
2388 if (diag)
2389 return KDB_BADINT;
2390
2391 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2392 if (!p) {
2393 kdb_printf("No task with pid=%d\n", (pid_t)val);
2394 return 0;
2395 }
2396 }
2397 kdb_set_current_task(p);
2398 }
2399 kdb_printf("KDB current process is %s(pid=%d)\n",
2400 kdb_current_task->comm,
2401 kdb_current_task->pid);
2402
2403 return 0;
2404}
2405
2406static int kdb_kgdb(int argc, const char **argv)
2407{
2408 return KDB_CMD_KGDB;
2409}
2410
2411/*
2412 * kdb_help - This function implements the 'help' and '?' commands.
2413 */
2414static int kdb_help(int argc, const char **argv)
2415{
2416 kdbtab_t *kt;
2417
2418 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2419 kdb_printf("-----------------------------"
2420 "-----------------------------\n");
2421 list_for_each_entry(kt, &kdb_cmds_head, list_node) {
2422 char *space = "";
2423 if (KDB_FLAG(CMD_INTERRUPT))
2424 return 0;
2425 if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
2426 continue;
2427 if (strlen(kt->usage) > 20)
2428 space = "\n ";
2429 kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
2430 kt->usage, space, kt->help);
2431 }
2432 return 0;
2433}
2434
2435/*
2436 * kdb_kill - This function implements the 'kill' commands.
2437 */
2438static int kdb_kill(int argc, const char **argv)
2439{
2440 long sig, pid;
2441 char *endp;
2442 struct task_struct *p;
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) || !valid_signal(-sig)) {
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 kdb_send_sig(p, sig);
2472 return 0;
2473}
2474
2475/*
2476 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2477 * I cannot call that code directly from kdb, it has an unconditional
2478 * cli()/sti() and calls routines that take locks which can stop the debugger.
2479 */
2480static void kdb_sysinfo(struct sysinfo *val)
2481{
2482 u64 uptime = ktime_get_mono_fast_ns();
2483
2484 memset(val, 0, sizeof(*val));
2485 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2486 val->loads[0] = avenrun[0];
2487 val->loads[1] = avenrun[1];
2488 val->loads[2] = avenrun[2];
2489 val->procs = nr_threads-1;
2490 si_meminfo(val);
2491
2492 return;
2493}
2494
2495/*
2496 * kdb_summary - This function implements the 'summary' command.
2497 */
2498static int kdb_summary(int argc, const char **argv)
2499{
2500 time64_t now;
2501 struct sysinfo val;
2502
2503 if (argc)
2504 return KDB_ARGCOUNT;
2505
2506 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2507 kdb_printf("release %s\n", init_uts_ns.name.release);
2508 kdb_printf("version %s\n", init_uts_ns.name.version);
2509 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2510 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2511 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2512
2513 now = __ktime_get_real_seconds();
2514 kdb_printf("date %ptTs tz_minuteswest %d\n", &now, sys_tz.tz_minuteswest);
2515 kdb_sysinfo(&val);
2516 kdb_printf("uptime ");
2517 if (val.uptime > (24*60*60)) {
2518 int days = val.uptime / (24*60*60);
2519 val.uptime %= (24*60*60);
2520 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2521 }
2522 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2523
2524 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2525 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2526 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2527 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2528
2529 /* Display in kilobytes */
2530#define K(x) ((x) << (PAGE_SHIFT - 10))
2531 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2532 "Buffers: %8lu kB\n",
2533 K(val.totalram), K(val.freeram), K(val.bufferram));
2534 return 0;
2535}
2536
2537/*
2538 * kdb_per_cpu - This function implements the 'per_cpu' command.
2539 */
2540static int kdb_per_cpu(int argc, const char **argv)
2541{
2542 char fmtstr[64];
2543 int cpu, diag, nextarg = 1;
2544 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2545
2546 if (argc < 1 || argc > 3)
2547 return KDB_ARGCOUNT;
2548
2549 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2550 if (diag)
2551 return diag;
2552
2553 if (argc >= 2) {
2554 diag = kdbgetularg(argv[2], &bytesperword);
2555 if (diag)
2556 return diag;
2557 }
2558 if (!bytesperword)
2559 bytesperword = KDB_WORD_SIZE;
2560 else if (bytesperword > KDB_WORD_SIZE)
2561 return KDB_BADWIDTH;
2562 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2563 if (argc >= 3) {
2564 diag = kdbgetularg(argv[3], &whichcpu);
2565 if (diag)
2566 return diag;
2567 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2568 kdb_printf("cpu %ld is not online\n", whichcpu);
2569 return KDB_BADCPUNUM;
2570 }
2571 }
2572
2573 /* Most architectures use __per_cpu_offset[cpu], some use
2574 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2575 */
2576#ifdef __per_cpu_offset
2577#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2578#else
2579#ifdef CONFIG_SMP
2580#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2581#else
2582#define KDB_PCU(cpu) 0
2583#endif
2584#endif
2585 for_each_online_cpu(cpu) {
2586 if (KDB_FLAG(CMD_INTERRUPT))
2587 return 0;
2588
2589 if (whichcpu != ~0UL && whichcpu != cpu)
2590 continue;
2591 addr = symaddr + KDB_PCU(cpu);
2592 diag = kdb_getword(&val, addr, bytesperword);
2593 if (diag) {
2594 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2595 "read, diag=%d\n", cpu, addr, diag);
2596 continue;
2597 }
2598 kdb_printf("%5d ", cpu);
2599 kdb_md_line(fmtstr, addr,
2600 bytesperword == KDB_WORD_SIZE,
2601 1, bytesperword, 1, 1, 0);
2602 }
2603#undef KDB_PCU
2604 return 0;
2605}
2606
2607/*
2608 * display help for the use of cmd | grep pattern
2609 */
2610static int kdb_grep_help(int argc, const char **argv)
2611{
2612 kdb_printf("Usage of cmd args | grep pattern:\n");
2613 kdb_printf(" Any command's output may be filtered through an ");
2614 kdb_printf("emulated 'pipe'.\n");
2615 kdb_printf(" 'grep' is just a key word.\n");
2616 kdb_printf(" The pattern may include a very limited set of "
2617 "metacharacters:\n");
2618 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2619 kdb_printf(" And if there are spaces in the pattern, you may "
2620 "quote it:\n");
2621 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2622 " or \"^pat tern$\"\n");
2623 return 0;
2624}
2625
2626/**
2627 * kdb_register() - This function is used to register a kernel debugger
2628 * command.
2629 * @cmd: pointer to kdb command
2630 *
2631 * Note that it's the job of the caller to keep the memory for the cmd
2632 * allocated until unregister is called.
2633 */
2634int kdb_register(kdbtab_t *cmd)
2635{
2636 kdbtab_t *kp;
2637
2638 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
2639 if (strcmp(kp->name, cmd->name) == 0) {
2640 kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
2641 cmd->name, cmd->func, cmd->help);
2642 return 1;
2643 }
2644 }
2645
2646 list_add_tail(&cmd->list_node, &kdb_cmds_head);
2647 return 0;
2648}
2649EXPORT_SYMBOL_GPL(kdb_register);
2650
2651/**
2652 * kdb_register_table() - This function is used to register a kdb command
2653 * table.
2654 * @kp: pointer to kdb command table
2655 * @len: length of kdb command table
2656 */
2657void kdb_register_table(kdbtab_t *kp, size_t len)
2658{
2659 while (len--) {
2660 list_add_tail(&kp->list_node, &kdb_cmds_head);
2661 kp++;
2662 }
2663}
2664
2665/**
2666 * kdb_unregister() - This function is used to unregister a kernel debugger
2667 * command. It is generally called when a module which
2668 * implements kdb command is unloaded.
2669 * @cmd: pointer to kdb command
2670 */
2671void kdb_unregister(kdbtab_t *cmd)
2672{
2673 list_del(&cmd->list_node);
2674}
2675EXPORT_SYMBOL_GPL(kdb_unregister);
2676
2677static kdbtab_t maintab[] = {
2678 { .name = "md",
2679 .func = kdb_md,
2680 .usage = "<vaddr>",
2681 .help = "Display Memory Contents, also mdWcN, e.g. md8c1",
2682 .minlen = 1,
2683 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2684 },
2685 { .name = "mdr",
2686 .func = kdb_md,
2687 .usage = "<vaddr> <bytes>",
2688 .help = "Display Raw Memory",
2689 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2690 },
2691 { .name = "mdp",
2692 .func = kdb_md,
2693 .usage = "<paddr> <bytes>",
2694 .help = "Display Physical Memory",
2695 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2696 },
2697 { .name = "mds",
2698 .func = kdb_md,
2699 .usage = "<vaddr>",
2700 .help = "Display Memory Symbolically",
2701 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2702 },
2703 { .name = "mm",
2704 .func = kdb_mm,
2705 .usage = "<vaddr> <contents>",
2706 .help = "Modify Memory Contents",
2707 .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
2708 },
2709 { .name = "go",
2710 .func = kdb_go,
2711 .usage = "[<vaddr>]",
2712 .help = "Continue Execution",
2713 .minlen = 1,
2714 .flags = KDB_ENABLE_REG_WRITE |
2715 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2716 },
2717 { .name = "rd",
2718 .func = kdb_rd,
2719 .usage = "",
2720 .help = "Display Registers",
2721 .flags = KDB_ENABLE_REG_READ,
2722 },
2723 { .name = "rm",
2724 .func = kdb_rm,
2725 .usage = "<reg> <contents>",
2726 .help = "Modify Registers",
2727 .flags = KDB_ENABLE_REG_WRITE,
2728 },
2729 { .name = "ef",
2730 .func = kdb_ef,
2731 .usage = "<vaddr>",
2732 .help = "Display exception frame",
2733 .flags = KDB_ENABLE_MEM_READ,
2734 },
2735 { .name = "bt",
2736 .func = kdb_bt,
2737 .usage = "[<vaddr>]",
2738 .help = "Stack traceback",
2739 .minlen = 1,
2740 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2741 },
2742 { .name = "btp",
2743 .func = kdb_bt,
2744 .usage = "<pid>",
2745 .help = "Display stack for process <pid>",
2746 .flags = KDB_ENABLE_INSPECT,
2747 },
2748 { .name = "bta",
2749 .func = kdb_bt,
2750 .usage = "[<state_chars>|A]",
2751 .help = "Backtrace all processes whose state matches",
2752 .flags = KDB_ENABLE_INSPECT,
2753 },
2754 { .name = "btc",
2755 .func = kdb_bt,
2756 .usage = "",
2757 .help = "Backtrace current process on each cpu",
2758 .flags = KDB_ENABLE_INSPECT,
2759 },
2760 { .name = "btt",
2761 .func = kdb_bt,
2762 .usage = "<vaddr>",
2763 .help = "Backtrace process given its struct task address",
2764 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2765 },
2766 { .name = "env",
2767 .func = kdb_env,
2768 .usage = "",
2769 .help = "Show environment variables",
2770 .flags = KDB_ENABLE_ALWAYS_SAFE,
2771 },
2772 { .name = "set",
2773 .func = kdb_set,
2774 .usage = "",
2775 .help = "Set environment variables",
2776 .flags = KDB_ENABLE_ALWAYS_SAFE,
2777 },
2778 { .name = "help",
2779 .func = kdb_help,
2780 .usage = "",
2781 .help = "Display Help Message",
2782 .minlen = 1,
2783 .flags = KDB_ENABLE_ALWAYS_SAFE,
2784 },
2785 { .name = "?",
2786 .func = kdb_help,
2787 .usage = "",
2788 .help = "Display Help Message",
2789 .flags = KDB_ENABLE_ALWAYS_SAFE,
2790 },
2791 { .name = "cpu",
2792 .func = kdb_cpu,
2793 .usage = "<cpunum>",
2794 .help = "Switch to new cpu",
2795 .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2796 },
2797 { .name = "kgdb",
2798 .func = kdb_kgdb,
2799 .usage = "",
2800 .help = "Enter kgdb mode",
2801 .flags = 0,
2802 },
2803 { .name = "ps",
2804 .func = kdb_ps,
2805 .usage = "[<state_chars>|A]",
2806 .help = "Display active task list",
2807 .flags = KDB_ENABLE_INSPECT,
2808 },
2809 { .name = "pid",
2810 .func = kdb_pid,
2811 .usage = "<pidnum>",
2812 .help = "Switch to another task",
2813 .flags = KDB_ENABLE_INSPECT,
2814 },
2815 { .name = "reboot",
2816 .func = kdb_reboot,
2817 .usage = "",
2818 .help = "Reboot the machine immediately",
2819 .flags = KDB_ENABLE_REBOOT,
2820 },
2821#if defined(CONFIG_MODULES)
2822 { .name = "lsmod",
2823 .func = kdb_lsmod,
2824 .usage = "",
2825 .help = "List loaded kernel modules",
2826 .flags = KDB_ENABLE_INSPECT,
2827 },
2828#endif
2829#if defined(CONFIG_MAGIC_SYSRQ)
2830 { .name = "sr",
2831 .func = kdb_sr,
2832 .usage = "<key>",
2833 .help = "Magic SysRq key",
2834 .flags = KDB_ENABLE_ALWAYS_SAFE,
2835 },
2836#endif
2837#if defined(CONFIG_PRINTK)
2838 { .name = "dmesg",
2839 .func = kdb_dmesg,
2840 .usage = "[lines]",
2841 .help = "Display syslog buffer",
2842 .flags = KDB_ENABLE_ALWAYS_SAFE,
2843 },
2844#endif
2845 { .name = "defcmd",
2846 .func = kdb_defcmd,
2847 .usage = "name \"usage\" \"help\"",
2848 .help = "Define a set of commands, down to endefcmd",
2849 /*
2850 * Macros are always safe because when executed each
2851 * internal command re-enters kdb_parse() and is safety
2852 * checked individually.
2853 */
2854 .flags = KDB_ENABLE_ALWAYS_SAFE,
2855 },
2856 { .name = "kill",
2857 .func = kdb_kill,
2858 .usage = "<-signal> <pid>",
2859 .help = "Send a signal to a process",
2860 .flags = KDB_ENABLE_SIGNAL,
2861 },
2862 { .name = "summary",
2863 .func = kdb_summary,
2864 .usage = "",
2865 .help = "Summarize the system",
2866 .minlen = 4,
2867 .flags = KDB_ENABLE_ALWAYS_SAFE,
2868 },
2869 { .name = "per_cpu",
2870 .func = kdb_per_cpu,
2871 .usage = "<sym> [<bytes>] [<cpu>]",
2872 .help = "Display per_cpu variables",
2873 .minlen = 3,
2874 .flags = KDB_ENABLE_MEM_READ,
2875 },
2876 { .name = "grephelp",
2877 .func = kdb_grep_help,
2878 .usage = "",
2879 .help = "Display help on | grep",
2880 .flags = KDB_ENABLE_ALWAYS_SAFE,
2881 },
2882};
2883
2884static kdbtab_t nmicmd = {
2885 .name = "disable_nmi",
2886 .func = kdb_disable_nmi,
2887 .usage = "",
2888 .help = "Disable NMI entry to KDB",
2889 .flags = KDB_ENABLE_ALWAYS_SAFE,
2890};
2891
2892/* Initialize the kdb command table. */
2893static void __init kdb_inittab(void)
2894{
2895 kdb_register_table(maintab, ARRAY_SIZE(maintab));
2896 if (arch_kgdb_ops.enable_nmi)
2897 kdb_register_table(&nmicmd, 1);
2898}
2899
2900/* Execute any commands defined in kdb_cmds. */
2901static void __init kdb_cmd_init(void)
2902{
2903 int i, diag;
2904 for (i = 0; kdb_cmds[i]; ++i) {
2905 diag = kdb_parse(kdb_cmds[i]);
2906 if (diag)
2907 kdb_printf("kdb command %s failed, kdb diag %d\n",
2908 kdb_cmds[i], diag);
2909 }
2910 if (defcmd_in_progress) {
2911 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2912 kdb_parse("endefcmd");
2913 }
2914}
2915
2916/* Initialize kdb_printf, breakpoint tables and kdb state */
2917void __init kdb_init(int lvl)
2918{
2919 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2920 int i;
2921
2922 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2923 return;
2924 for (i = kdb_init_lvl; i < lvl; i++) {
2925 switch (i) {
2926 case KDB_NOT_INITIALIZED:
2927 kdb_inittab(); /* Initialize Command Table */
2928 kdb_initbptab(); /* Initialize Breakpoints */
2929 break;
2930 case KDB_INIT_EARLY:
2931 kdb_cmd_init(); /* Build kdb_cmds tables */
2932 break;
2933 }
2934 }
2935 kdb_init_lvl = lvl;
2936}
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;
63
64/*
65 * kdb_lock protects updates to kdb_initial_cpu. Used to
66 * single thread processors through the kernel debugger.
67 */
68int kdb_initial_cpu = -1; /* cpu number that owns kdb */
69int kdb_nextline = 1;
70int kdb_state; /* General KDB state */
71
72struct task_struct *kdb_current_task;
73EXPORT_SYMBOL(kdb_current_task);
74struct pt_regs *kdb_current_regs;
75
76const char *kdb_diemsg;
77static int kdb_go_count;
78#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
79static unsigned int kdb_continue_catastrophic =
80 CONFIG_KDB_CONTINUE_CATASTROPHIC;
81#else
82static unsigned int kdb_continue_catastrophic;
83#endif
84
85/* kdb_commands describes the available commands. */
86static kdbtab_t *kdb_commands;
87#define KDB_BASE_CMD_MAX 50
88static int kdb_max_commands = KDB_BASE_CMD_MAX;
89static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
90#define for_each_kdbcmd(cmd, num) \
91 for ((cmd) = kdb_base_commands, (num) = 0; \
92 num < kdb_max_commands; \
93 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
94
95typedef struct _kdbmsg {
96 int km_diag; /* kdb diagnostic */
97 char *km_msg; /* Corresponding message text */
98} kdbmsg_t;
99
100#define KDBMSG(msgnum, text) \
101 { KDB_##msgnum, text }
102
103static kdbmsg_t kdbmsgs[] = {
104 KDBMSG(NOTFOUND, "Command Not Found"),
105 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
106 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
107 "8 is only allowed on 64 bit systems"),
108 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
109 KDBMSG(NOTENV, "Cannot find environment variable"),
110 KDBMSG(NOENVVALUE, "Environment variable should have value"),
111 KDBMSG(NOTIMP, "Command not implemented"),
112 KDBMSG(ENVFULL, "Environment full"),
113 KDBMSG(ENVBUFFULL, "Environment buffer full"),
114 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
115#ifdef CONFIG_CPU_XSCALE
116 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
117#else
118 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
119#endif
120 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
121 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
122 KDBMSG(BADMODE, "Invalid IDMODE"),
123 KDBMSG(BADINT, "Illegal numeric value"),
124 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
125 KDBMSG(BADREG, "Invalid register name"),
126 KDBMSG(BADCPUNUM, "Invalid cpu number"),
127 KDBMSG(BADLENGTH, "Invalid length field"),
128 KDBMSG(NOBP, "No Breakpoint exists"),
129 KDBMSG(BADADDR, "Invalid address"),
130 KDBMSG(NOPERM, "Permission denied"),
131};
132#undef KDBMSG
133
134static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
135
136
137/*
138 * Initial environment. This is all kept static and local to
139 * this file. We don't want to rely on the memory allocation
140 * mechanisms in the kernel, so we use a very limited allocate-only
141 * heap for new and altered environment variables. The entire
142 * environment is limited to a fixed number of entries (add more
143 * to __env[] if required) and a fixed amount of heap (add more to
144 * KDB_ENVBUFSIZE if required).
145 */
146
147static char *__env[] = {
148#if defined(CONFIG_SMP)
149 "PROMPT=[%d]kdb> ",
150#else
151 "PROMPT=kdb> ",
152#endif
153 "MOREPROMPT=more> ",
154 "RADIX=16",
155 "MDCOUNT=8", /* lines of md output */
156 KDB_PLATFORM_ENV,
157 "DTABCOUNT=30",
158 "NOSECT=1",
159 (char *)0,
160 (char *)0,
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176 (char *)0,
177 (char *)0,
178 (char *)0,
179 (char *)0,
180 (char *)0,
181 (char *)0,
182 (char *)0,
183};
184
185static const int __nenv = ARRAY_SIZE(__env);
186
187struct task_struct *kdb_curr_task(int cpu)
188{
189 struct task_struct *p = curr_task(cpu);
190#ifdef _TIF_MCA_INIT
191 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
192 p = krp->p;
193#endif
194 return p;
195}
196
197/*
198 * Check whether the flags of the current command and the permissions
199 * of the kdb console has allow a command to be run.
200 */
201static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
202 bool no_args)
203{
204 /* permissions comes from userspace so needs massaging slightly */
205 permissions &= KDB_ENABLE_MASK;
206 permissions |= KDB_ENABLE_ALWAYS_SAFE;
207
208 /* some commands change group when launched with no arguments */
209 if (no_args)
210 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
211
212 flags |= KDB_ENABLE_ALL;
213
214 return permissions & flags;
215}
216
217/*
218 * kdbgetenv - This function will return the character string value of
219 * an environment variable.
220 * Parameters:
221 * match A character string representing an environment variable.
222 * Returns:
223 * NULL No environment variable matches 'match'
224 * char* Pointer to string value of environment variable.
225 */
226char *kdbgetenv(const char *match)
227{
228 char **ep = __env;
229 int matchlen = strlen(match);
230 int i;
231
232 for (i = 0; i < __nenv; i++) {
233 char *e = *ep++;
234
235 if (!e)
236 continue;
237
238 if ((strncmp(match, e, matchlen) == 0)
239 && ((e[matchlen] == '\0')
240 || (e[matchlen] == '='))) {
241 char *cp = strchr(e, '=');
242 return cp ? ++cp : "";
243 }
244 }
245 return NULL;
246}
247
248/*
249 * kdballocenv - This function is used to allocate bytes for
250 * environment entries.
251 * Parameters:
252 * match A character string representing a numeric value
253 * Outputs:
254 * *value the unsigned long representation of the env variable 'match'
255 * Returns:
256 * Zero on success, a kdb diagnostic on failure.
257 * Remarks:
258 * We use a static environment buffer (envbuffer) to hold the values
259 * of dynamically generated environment variables (see kdb_set). Buffer
260 * space once allocated is never free'd, so over time, the amount of space
261 * (currently 512 bytes) will be exhausted if env variables are changed
262 * frequently.
263 */
264static char *kdballocenv(size_t bytes)
265{
266#define KDB_ENVBUFSIZE 512
267 static char envbuffer[KDB_ENVBUFSIZE];
268 static int envbufsize;
269 char *ep = NULL;
270
271 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
272 ep = &envbuffer[envbufsize];
273 envbufsize += bytes;
274 }
275 return ep;
276}
277
278/*
279 * kdbgetulenv - This function will return the value of an unsigned
280 * long-valued environment variable.
281 * Parameters:
282 * match A character string representing a numeric value
283 * Outputs:
284 * *value the unsigned long represntation of the env variable 'match'
285 * Returns:
286 * Zero on success, a kdb diagnostic on failure.
287 */
288static int kdbgetulenv(const char *match, unsigned long *value)
289{
290 char *ep;
291
292 ep = kdbgetenv(match);
293 if (!ep)
294 return KDB_NOTENV;
295 if (strlen(ep) == 0)
296 return KDB_NOENVVALUE;
297
298 *value = simple_strtoul(ep, NULL, 0);
299
300 return 0;
301}
302
303/*
304 * kdbgetintenv - This function will return the value of an
305 * integer-valued environment variable.
306 * Parameters:
307 * match A character string representing an integer-valued env variable
308 * Outputs:
309 * *value the integer representation of the environment variable 'match'
310 * Returns:
311 * Zero on success, a kdb diagnostic on failure.
312 */
313int kdbgetintenv(const char *match, int *value)
314{
315 unsigned long val;
316 int diag;
317
318 diag = kdbgetulenv(match, &val);
319 if (!diag)
320 *value = (int) val;
321 return diag;
322}
323
324/*
325 * kdbgetularg - This function will convert a numeric string into an
326 * unsigned long value.
327 * Parameters:
328 * arg A character string representing a numeric value
329 * Outputs:
330 * *value the unsigned long represntation of arg.
331 * Returns:
332 * Zero on success, a kdb diagnostic on failure.
333 */
334int kdbgetularg(const char *arg, unsigned long *value)
335{
336 char *endp;
337 unsigned long val;
338
339 val = simple_strtoul(arg, &endp, 0);
340
341 if (endp == arg) {
342 /*
343 * Also try base 16, for us folks too lazy to type the
344 * leading 0x...
345 */
346 val = simple_strtoul(arg, &endp, 16);
347 if (endp == arg)
348 return KDB_BADINT;
349 }
350
351 *value = val;
352
353 return 0;
354}
355
356int kdbgetu64arg(const char *arg, u64 *value)
357{
358 char *endp;
359 u64 val;
360
361 val = simple_strtoull(arg, &endp, 0);
362
363 if (endp == arg) {
364
365 val = simple_strtoull(arg, &endp, 16);
366 if (endp == arg)
367 return KDB_BADINT;
368 }
369
370 *value = val;
371
372 return 0;
373}
374
375/*
376 * kdb_set - This function implements the 'set' command. Alter an
377 * existing environment variable or create a new one.
378 */
379int kdb_set(int argc, const char **argv)
380{
381 int i;
382 char *ep;
383 size_t varlen, vallen;
384
385 /*
386 * we can be invoked two ways:
387 * set var=value argv[1]="var", argv[2]="value"
388 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
389 * - if the latter, shift 'em down.
390 */
391 if (argc == 3) {
392 argv[2] = argv[3];
393 argc--;
394 }
395
396 if (argc != 2)
397 return KDB_ARGCOUNT;
398
399 /*
400 * Check for internal variables
401 */
402 if (strcmp(argv[1], "KDBDEBUG") == 0) {
403 unsigned int debugflags;
404 char *cp;
405
406 debugflags = simple_strtoul(argv[2], &cp, 0);
407 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
408 kdb_printf("kdb: illegal debug flags '%s'\n",
409 argv[2]);
410 return 0;
411 }
412 kdb_flags = (kdb_flags &
413 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
414 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
415
416 return 0;
417 }
418
419 /*
420 * Tokenizer squashed the '=' sign. argv[1] is variable
421 * name, argv[2] = value.
422 */
423 varlen = strlen(argv[1]);
424 vallen = strlen(argv[2]);
425 ep = kdballocenv(varlen + vallen + 2);
426 if (ep == (char *)0)
427 return KDB_ENVBUFFULL;
428
429 sprintf(ep, "%s=%s", argv[1], argv[2]);
430
431 ep[varlen+vallen+1] = '\0';
432
433 for (i = 0; i < __nenv; i++) {
434 if (__env[i]
435 && ((strncmp(__env[i], argv[1], varlen) == 0)
436 && ((__env[i][varlen] == '\0')
437 || (__env[i][varlen] == '=')))) {
438 __env[i] = ep;
439 return 0;
440 }
441 }
442
443 /*
444 * Wasn't existing variable. Fit into slot.
445 */
446 for (i = 0; i < __nenv-1; i++) {
447 if (__env[i] == (char *)0) {
448 __env[i] = ep;
449 return 0;
450 }
451 }
452
453 return KDB_ENVFULL;
454}
455
456static int kdb_check_regs(void)
457{
458 if (!kdb_current_regs) {
459 kdb_printf("No current kdb registers."
460 " You may need to select another task\n");
461 return KDB_BADREG;
462 }
463 return 0;
464}
465
466/*
467 * kdbgetaddrarg - This function is responsible for parsing an
468 * address-expression and returning the value of the expression,
469 * symbol name, and offset to the caller.
470 *
471 * The argument may consist of a numeric value (decimal or
472 * hexidecimal), a symbol name, a register name (preceded by the
473 * percent sign), an environment variable with a numeric value
474 * (preceded by a dollar sign) or a simple arithmetic expression
475 * consisting of a symbol name, +/-, and a numeric constant value
476 * (offset).
477 * Parameters:
478 * argc - count of arguments in argv
479 * argv - argument vector
480 * *nextarg - index to next unparsed argument in argv[]
481 * regs - Register state at time of KDB entry
482 * Outputs:
483 * *value - receives the value of the address-expression
484 * *offset - receives the offset specified, if any
485 * *name - receives the symbol name, if any
486 * *nextarg - index to next unparsed argument in argv[]
487 * Returns:
488 * zero is returned on success, a kdb diagnostic code is
489 * returned on error.
490 */
491int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
492 unsigned long *value, long *offset,
493 char **name)
494{
495 unsigned long addr;
496 unsigned long off = 0;
497 int positive;
498 int diag;
499 int found = 0;
500 char *symname;
501 char symbol = '\0';
502 char *cp;
503 kdb_symtab_t symtab;
504
505 /*
506 * If the enable flags prohibit both arbitrary memory access
507 * and flow control then there are no reasonable grounds to
508 * provide symbol lookup.
509 */
510 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
511 kdb_cmd_enabled, false))
512 return KDB_NOPERM;
513
514 /*
515 * Process arguments which follow the following syntax:
516 *
517 * symbol | numeric-address [+/- numeric-offset]
518 * %register
519 * $environment-variable
520 */
521
522 if (*nextarg > argc)
523 return KDB_ARGCOUNT;
524
525 symname = (char *)argv[*nextarg];
526
527 /*
528 * If there is no whitespace between the symbol
529 * or address and the '+' or '-' symbols, we
530 * remember the character and replace it with a
531 * null so the symbol/value can be properly parsed
532 */
533 cp = strpbrk(symname, "+-");
534 if (cp != NULL) {
535 symbol = *cp;
536 *cp++ = '\0';
537 }
538
539 if (symname[0] == '$') {
540 diag = kdbgetulenv(&symname[1], &addr);
541 if (diag)
542 return diag;
543 } else if (symname[0] == '%') {
544 diag = kdb_check_regs();
545 if (diag)
546 return diag;
547 /* Implement register values with % at a later time as it is
548 * arch optional.
549 */
550 return KDB_NOTIMP;
551 } else {
552 found = kdbgetsymval(symname, &symtab);
553 if (found) {
554 addr = symtab.sym_start;
555 } else {
556 diag = kdbgetularg(argv[*nextarg], &addr);
557 if (diag)
558 return diag;
559 }
560 }
561
562 if (!found)
563 found = kdbnearsym(addr, &symtab);
564
565 (*nextarg)++;
566
567 if (name)
568 *name = symname;
569 if (value)
570 *value = addr;
571 if (offset && name && *name)
572 *offset = addr - symtab.sym_start;
573
574 if ((*nextarg > argc)
575 && (symbol == '\0'))
576 return 0;
577
578 /*
579 * check for +/- and offset
580 */
581
582 if (symbol == '\0') {
583 if ((argv[*nextarg][0] != '+')
584 && (argv[*nextarg][0] != '-')) {
585 /*
586 * Not our argument. Return.
587 */
588 return 0;
589 } else {
590 positive = (argv[*nextarg][0] == '+');
591 (*nextarg)++;
592 }
593 } else
594 positive = (symbol == '+');
595
596 /*
597 * Now there must be an offset!
598 */
599 if ((*nextarg > argc)
600 && (symbol == '\0')) {
601 return KDB_INVADDRFMT;
602 }
603
604 if (!symbol) {
605 cp = (char *)argv[*nextarg];
606 (*nextarg)++;
607 }
608
609 diag = kdbgetularg(cp, &off);
610 if (diag)
611 return diag;
612
613 if (!positive)
614 off = -off;
615
616 if (offset)
617 *offset += off;
618
619 if (value)
620 *value += off;
621
622 return 0;
623}
624
625static void kdb_cmderror(int diag)
626{
627 int i;
628
629 if (diag >= 0) {
630 kdb_printf("no error detected (diagnostic is %d)\n", diag);
631 return;
632 }
633
634 for (i = 0; i < __nkdb_err; i++) {
635 if (kdbmsgs[i].km_diag == diag) {
636 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
637 return;
638 }
639 }
640
641 kdb_printf("Unknown diag %d\n", -diag);
642}
643
644/*
645 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
646 * command which defines one command as a set of other commands,
647 * terminated by endefcmd. kdb_defcmd processes the initial
648 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
649 * the following commands until 'endefcmd'.
650 * Inputs:
651 * argc argument count
652 * argv argument vector
653 * Returns:
654 * zero for success, a kdb diagnostic if error
655 */
656struct defcmd_set {
657 int count;
658 int usable;
659 char *name;
660 char *usage;
661 char *help;
662 char **command;
663};
664static struct defcmd_set *defcmd_set;
665static int defcmd_set_count;
666static int defcmd_in_progress;
667
668/* Forward references */
669static int kdb_exec_defcmd(int argc, const char **argv);
670
671static int kdb_defcmd2(const char *cmdstr, const char *argv0)
672{
673 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
674 char **save_command = s->command;
675 if (strcmp(argv0, "endefcmd") == 0) {
676 defcmd_in_progress = 0;
677 if (!s->count)
678 s->usable = 0;
679 if (s->usable)
680 /* macros are always safe because when executed each
681 * internal command re-enters kdb_parse() and is
682 * safety checked individually.
683 */
684 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
685 s->help, 0,
686 KDB_ENABLE_ALWAYS_SAFE);
687 return 0;
688 }
689 if (!s->usable)
690 return KDB_NOTIMP;
691 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
692 if (!s->command) {
693 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
694 cmdstr);
695 s->usable = 0;
696 return KDB_NOTIMP;
697 }
698 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
699 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
700 kfree(save_command);
701 return 0;
702}
703
704static int kdb_defcmd(int argc, const char **argv)
705{
706 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
707 if (defcmd_in_progress) {
708 kdb_printf("kdb: nested defcmd detected, assuming missing "
709 "endefcmd\n");
710 kdb_defcmd2("endefcmd", "endefcmd");
711 }
712 if (argc == 0) {
713 int i;
714 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
715 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
716 s->usage, s->help);
717 for (i = 0; i < s->count; ++i)
718 kdb_printf("%s", s->command[i]);
719 kdb_printf("endefcmd\n");
720 }
721 return 0;
722 }
723 if (argc != 3)
724 return KDB_ARGCOUNT;
725 if (in_dbg_master()) {
726 kdb_printf("Command only available during kdb_init()\n");
727 return KDB_NOTIMP;
728 }
729 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
730 GFP_KDB);
731 if (!defcmd_set)
732 goto fail_defcmd;
733 memcpy(defcmd_set, save_defcmd_set,
734 defcmd_set_count * sizeof(*defcmd_set));
735 s = defcmd_set + defcmd_set_count;
736 memset(s, 0, sizeof(*s));
737 s->usable = 1;
738 s->name = kdb_strdup(argv[1], GFP_KDB);
739 if (!s->name)
740 goto fail_name;
741 s->usage = kdb_strdup(argv[2], GFP_KDB);
742 if (!s->usage)
743 goto fail_usage;
744 s->help = kdb_strdup(argv[3], GFP_KDB);
745 if (!s->help)
746 goto fail_help;
747 if (s->usage[0] == '"') {
748 strcpy(s->usage, argv[2]+1);
749 s->usage[strlen(s->usage)-1] = '\0';
750 }
751 if (s->help[0] == '"') {
752 strcpy(s->help, argv[3]+1);
753 s->help[strlen(s->help)-1] = '\0';
754 }
755 ++defcmd_set_count;
756 defcmd_in_progress = 1;
757 kfree(save_defcmd_set);
758 return 0;
759fail_help:
760 kfree(s->usage);
761fail_usage:
762 kfree(s->name);
763fail_name:
764 kfree(defcmd_set);
765fail_defcmd:
766 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
767 defcmd_set = save_defcmd_set;
768 return KDB_NOTIMP;
769}
770
771/*
772 * kdb_exec_defcmd - Execute the set of commands associated with this
773 * defcmd name.
774 * Inputs:
775 * argc argument count
776 * argv argument vector
777 * Returns:
778 * zero for success, a kdb diagnostic if error
779 */
780static int kdb_exec_defcmd(int argc, const char **argv)
781{
782 int i, ret;
783 struct defcmd_set *s;
784 if (argc != 0)
785 return KDB_ARGCOUNT;
786 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
787 if (strcmp(s->name, argv[0]) == 0)
788 break;
789 }
790 if (i == defcmd_set_count) {
791 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
792 argv[0]);
793 return KDB_NOTIMP;
794 }
795 for (i = 0; i < s->count; ++i) {
796 /* Recursive use of kdb_parse, do not use argv after
797 * this point */
798 argv = NULL;
799 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
800 ret = kdb_parse(s->command[i]);
801 if (ret)
802 return ret;
803 }
804 return 0;
805}
806
807/* Command history */
808#define KDB_CMD_HISTORY_COUNT 32
809#define CMD_BUFLEN 200 /* kdb_printf: max printline
810 * size == 256 */
811static unsigned int cmd_head, cmd_tail;
812static unsigned int cmdptr;
813static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
814static char cmd_cur[CMD_BUFLEN];
815
816/*
817 * The "str" argument may point to something like | grep xyz
818 */
819static void parse_grep(const char *str)
820{
821 int len;
822 char *cp = (char *)str, *cp2;
823
824 /* sanity check: we should have been called with the \ first */
825 if (*cp != '|')
826 return;
827 cp++;
828 while (isspace(*cp))
829 cp++;
830 if (strncmp(cp, "grep ", 5)) {
831 kdb_printf("invalid 'pipe', see grephelp\n");
832 return;
833 }
834 cp += 5;
835 while (isspace(*cp))
836 cp++;
837 cp2 = strchr(cp, '\n');
838 if (cp2)
839 *cp2 = '\0'; /* remove the trailing newline */
840 len = strlen(cp);
841 if (len == 0) {
842 kdb_printf("invalid 'pipe', see grephelp\n");
843 return;
844 }
845 /* now cp points to a nonzero length search string */
846 if (*cp == '"') {
847 /* allow it be "x y z" by removing the "'s - there must
848 be two of them */
849 cp++;
850 cp2 = strchr(cp, '"');
851 if (!cp2) {
852 kdb_printf("invalid quoted string, see grephelp\n");
853 return;
854 }
855 *cp2 = '\0'; /* end the string where the 2nd " was */
856 }
857 kdb_grep_leading = 0;
858 if (*cp == '^') {
859 kdb_grep_leading = 1;
860 cp++;
861 }
862 len = strlen(cp);
863 kdb_grep_trailing = 0;
864 if (*(cp+len-1) == '$') {
865 kdb_grep_trailing = 1;
866 *(cp+len-1) = '\0';
867 }
868 len = strlen(cp);
869 if (!len)
870 return;
871 if (len >= KDB_GREP_STRLEN) {
872 kdb_printf("search string too long\n");
873 return;
874 }
875 strcpy(kdb_grep_string, cp);
876 kdb_grepping_flag++;
877 return;
878}
879
880/*
881 * kdb_parse - Parse the command line, search the command table for a
882 * matching command and invoke the command function. This
883 * function may be called recursively, if it is, the second call
884 * will overwrite argv and cbuf. It is the caller's
885 * responsibility to save their argv if they recursively call
886 * kdb_parse().
887 * Parameters:
888 * cmdstr The input command line to be parsed.
889 * regs The registers at the time kdb was entered.
890 * Returns:
891 * Zero for success, a kdb diagnostic if failure.
892 * Remarks:
893 * Limited to 20 tokens.
894 *
895 * Real rudimentary tokenization. Basically only whitespace
896 * is considered a token delimeter (but special consideration
897 * is taken of the '=' sign as used by the 'set' command).
898 *
899 * The algorithm used to tokenize the input string relies on
900 * there being at least one whitespace (or otherwise useless)
901 * character between tokens as the character immediately following
902 * the token is altered in-place to a null-byte to terminate the
903 * token string.
904 */
905
906#define MAXARGC 20
907
908int kdb_parse(const char *cmdstr)
909{
910 static char *argv[MAXARGC];
911 static int argc;
912 static char cbuf[CMD_BUFLEN+2];
913 char *cp;
914 char *cpp, quoted;
915 kdbtab_t *tp;
916 int i, escaped, ignore_errors = 0, check_grep = 0;
917
918 /*
919 * First tokenize the command string.
920 */
921 cp = (char *)cmdstr;
922
923 if (KDB_FLAG(CMD_INTERRUPT)) {
924 /* Previous command was interrupted, newline must not
925 * repeat the command */
926 KDB_FLAG_CLEAR(CMD_INTERRUPT);
927 KDB_STATE_SET(PAGER);
928 argc = 0; /* no repeat */
929 }
930
931 if (*cp != '\n' && *cp != '\0') {
932 argc = 0;
933 cpp = cbuf;
934 while (*cp) {
935 /* skip whitespace */
936 while (isspace(*cp))
937 cp++;
938 if ((*cp == '\0') || (*cp == '\n') ||
939 (*cp == '#' && !defcmd_in_progress))
940 break;
941 /* special case: check for | grep pattern */
942 if (*cp == '|') {
943 check_grep++;
944 break;
945 }
946 if (cpp >= cbuf + CMD_BUFLEN) {
947 kdb_printf("kdb_parse: command buffer "
948 "overflow, command ignored\n%s\n",
949 cmdstr);
950 return KDB_NOTFOUND;
951 }
952 if (argc >= MAXARGC - 1) {
953 kdb_printf("kdb_parse: too many arguments, "
954 "command ignored\n%s\n", cmdstr);
955 return KDB_NOTFOUND;
956 }
957 argv[argc++] = cpp;
958 escaped = 0;
959 quoted = '\0';
960 /* Copy to next unquoted and unescaped
961 * whitespace or '=' */
962 while (*cp && *cp != '\n' &&
963 (escaped || quoted || !isspace(*cp))) {
964 if (cpp >= cbuf + CMD_BUFLEN)
965 break;
966 if (escaped) {
967 escaped = 0;
968 *cpp++ = *cp++;
969 continue;
970 }
971 if (*cp == '\\') {
972 escaped = 1;
973 ++cp;
974 continue;
975 }
976 if (*cp == quoted)
977 quoted = '\0';
978 else if (*cp == '\'' || *cp == '"')
979 quoted = *cp;
980 *cpp = *cp++;
981 if (*cpp == '=' && !quoted)
982 break;
983 ++cpp;
984 }
985 *cpp++ = '\0'; /* Squash a ws or '=' character */
986 }
987 }
988 if (!argc)
989 return 0;
990 if (check_grep)
991 parse_grep(cp);
992 if (defcmd_in_progress) {
993 int result = kdb_defcmd2(cmdstr, argv[0]);
994 if (!defcmd_in_progress) {
995 argc = 0; /* avoid repeat on endefcmd */
996 *(argv[0]) = '\0';
997 }
998 return result;
999 }
1000 if (argv[0][0] == '-' && argv[0][1] &&
1001 (argv[0][1] < '0' || argv[0][1] > '9')) {
1002 ignore_errors = 1;
1003 ++argv[0];
1004 }
1005
1006 for_each_kdbcmd(tp, i) {
1007 if (tp->cmd_name) {
1008 /*
1009 * If this command is allowed to be abbreviated,
1010 * check to see if this is it.
1011 */
1012
1013 if (tp->cmd_minlen
1014 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1015 if (strncmp(argv[0],
1016 tp->cmd_name,
1017 tp->cmd_minlen) == 0) {
1018 break;
1019 }
1020 }
1021
1022 if (strcmp(argv[0], tp->cmd_name) == 0)
1023 break;
1024 }
1025 }
1026
1027 /*
1028 * If we don't find a command by this name, see if the first
1029 * few characters of this match any of the known commands.
1030 * e.g., md1c20 should match md.
1031 */
1032 if (i == kdb_max_commands) {
1033 for_each_kdbcmd(tp, i) {
1034 if (tp->cmd_name) {
1035 if (strncmp(argv[0],
1036 tp->cmd_name,
1037 strlen(tp->cmd_name)) == 0) {
1038 break;
1039 }
1040 }
1041 }
1042 }
1043
1044 if (i < kdb_max_commands) {
1045 int result;
1046
1047 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1048 return KDB_NOPERM;
1049
1050 KDB_STATE_SET(CMD);
1051 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1052 if (result && ignore_errors && result > KDB_CMD_GO)
1053 result = 0;
1054 KDB_STATE_CLEAR(CMD);
1055
1056 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1057 return result;
1058
1059 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1060 if (argv[argc])
1061 *(argv[argc]) = '\0';
1062 return result;
1063 }
1064
1065 /*
1066 * If the input with which we were presented does not
1067 * map to an existing command, attempt to parse it as an
1068 * address argument and display the result. Useful for
1069 * obtaining the address of a variable, or the nearest symbol
1070 * to an address contained in a register.
1071 */
1072 {
1073 unsigned long value;
1074 char *name = NULL;
1075 long offset;
1076 int nextarg = 0;
1077
1078 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1079 &value, &offset, &name)) {
1080 return KDB_NOTFOUND;
1081 }
1082
1083 kdb_printf("%s = ", argv[0]);
1084 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1085 kdb_printf("\n");
1086 return 0;
1087 }
1088}
1089
1090
1091static int handle_ctrl_cmd(char *cmd)
1092{
1093#define CTRL_P 16
1094#define CTRL_N 14
1095
1096 /* initial situation */
1097 if (cmd_head == cmd_tail)
1098 return 0;
1099 switch (*cmd) {
1100 case CTRL_P:
1101 if (cmdptr != cmd_tail)
1102 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1103 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1104 return 1;
1105 case CTRL_N:
1106 if (cmdptr != cmd_head)
1107 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1108 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1109 return 1;
1110 }
1111 return 0;
1112}
1113
1114/*
1115 * kdb_reboot - This function implements the 'reboot' command. Reboot
1116 * the system immediately, or loop for ever on failure.
1117 */
1118static int kdb_reboot(int argc, const char **argv)
1119{
1120 emergency_restart();
1121 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1122 while (1)
1123 cpu_relax();
1124 /* NOTREACHED */
1125 return 0;
1126}
1127
1128static void kdb_dumpregs(struct pt_regs *regs)
1129{
1130 int old_lvl = console_loglevel;
1131 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1132 kdb_trap_printk++;
1133 show_regs(regs);
1134 kdb_trap_printk--;
1135 kdb_printf("\n");
1136 console_loglevel = old_lvl;
1137}
1138
1139void kdb_set_current_task(struct task_struct *p)
1140{
1141 kdb_current_task = p;
1142
1143 if (kdb_task_has_cpu(p)) {
1144 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1145 return;
1146 }
1147 kdb_current_regs = NULL;
1148}
1149
1150/*
1151 * kdb_local - The main code for kdb. This routine is invoked on a
1152 * specific processor, it is not global. The main kdb() routine
1153 * ensures that only one processor at a time is in this routine.
1154 * This code is called with the real reason code on the first
1155 * entry to a kdb session, thereafter it is called with reason
1156 * SWITCH, even if the user goes back to the original cpu.
1157 * Inputs:
1158 * reason The reason KDB was invoked
1159 * error The hardware-defined error code
1160 * regs The exception frame at time of fault/breakpoint.
1161 * db_result Result code from the break or debug point.
1162 * Returns:
1163 * 0 KDB was invoked for an event which it wasn't responsible
1164 * 1 KDB handled the event for which it was invoked.
1165 * KDB_CMD_GO User typed 'go'.
1166 * KDB_CMD_CPU User switched to another cpu.
1167 * KDB_CMD_SS Single step.
1168 */
1169static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1170 kdb_dbtrap_t db_result)
1171{
1172 char *cmdbuf;
1173 int diag;
1174 struct task_struct *kdb_current =
1175 kdb_curr_task(raw_smp_processor_id());
1176
1177 KDB_DEBUG_STATE("kdb_local 1", reason);
1178 kdb_go_count = 0;
1179 if (reason == KDB_REASON_DEBUG) {
1180 /* special case below */
1181 } else {
1182 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1183 kdb_current, kdb_current ? kdb_current->pid : 0);
1184#if defined(CONFIG_SMP)
1185 kdb_printf("on processor %d ", raw_smp_processor_id());
1186#endif
1187 }
1188
1189 switch (reason) {
1190 case KDB_REASON_DEBUG:
1191 {
1192 /*
1193 * If re-entering kdb after a single step
1194 * command, don't print the message.
1195 */
1196 switch (db_result) {
1197 case KDB_DB_BPT:
1198 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1199 kdb_current, kdb_current->pid);
1200#if defined(CONFIG_SMP)
1201 kdb_printf("on processor %d ", raw_smp_processor_id());
1202#endif
1203 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1204 instruction_pointer(regs));
1205 break;
1206 case KDB_DB_SS:
1207 break;
1208 case KDB_DB_SSBPT:
1209 KDB_DEBUG_STATE("kdb_local 4", reason);
1210 return 1; /* kdba_db_trap did the work */
1211 default:
1212 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1213 db_result);
1214 break;
1215 }
1216
1217 }
1218 break;
1219 case KDB_REASON_ENTER:
1220 if (KDB_STATE(KEYBOARD))
1221 kdb_printf("due to Keyboard Entry\n");
1222 else
1223 kdb_printf("due to KDB_ENTER()\n");
1224 break;
1225 case KDB_REASON_KEYBOARD:
1226 KDB_STATE_SET(KEYBOARD);
1227 kdb_printf("due to Keyboard Entry\n");
1228 break;
1229 case KDB_REASON_ENTER_SLAVE:
1230 /* drop through, slaves only get released via cpu switch */
1231 case KDB_REASON_SWITCH:
1232 kdb_printf("due to cpu switch\n");
1233 break;
1234 case KDB_REASON_OOPS:
1235 kdb_printf("Oops: %s\n", kdb_diemsg);
1236 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1237 instruction_pointer(regs));
1238 kdb_dumpregs(regs);
1239 break;
1240 case KDB_REASON_SYSTEM_NMI:
1241 kdb_printf("due to System NonMaskable Interrupt\n");
1242 break;
1243 case KDB_REASON_NMI:
1244 kdb_printf("due to NonMaskable Interrupt @ "
1245 kdb_machreg_fmt "\n",
1246 instruction_pointer(regs));
1247 break;
1248 case KDB_REASON_SSTEP:
1249 case KDB_REASON_BREAK:
1250 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1251 reason == KDB_REASON_BREAK ?
1252 "Breakpoint" : "SS trap", instruction_pointer(regs));
1253 /*
1254 * Determine if this breakpoint is one that we
1255 * are interested in.
1256 */
1257 if (db_result != KDB_DB_BPT) {
1258 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1259 db_result);
1260 KDB_DEBUG_STATE("kdb_local 6", reason);
1261 return 0; /* Not for us, dismiss it */
1262 }
1263 break;
1264 case KDB_REASON_RECURSE:
1265 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1266 instruction_pointer(regs));
1267 break;
1268 default:
1269 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1270 KDB_DEBUG_STATE("kdb_local 8", reason);
1271 return 0; /* Not for us, dismiss it */
1272 }
1273
1274 while (1) {
1275 /*
1276 * Initialize pager context.
1277 */
1278 kdb_nextline = 1;
1279 KDB_STATE_CLEAR(SUPPRESS);
1280 kdb_grepping_flag = 0;
1281 /* ensure the old search does not leak into '/' commands */
1282 kdb_grep_string[0] = '\0';
1283
1284 cmdbuf = cmd_cur;
1285 *cmdbuf = '\0';
1286 *(cmd_hist[cmd_head]) = '\0';
1287
1288do_full_getstr:
1289#if defined(CONFIG_SMP)
1290 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1291 raw_smp_processor_id());
1292#else
1293 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1294#endif
1295 if (defcmd_in_progress)
1296 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1297
1298 /*
1299 * Fetch command from keyboard
1300 */
1301 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1302 if (*cmdbuf != '\n') {
1303 if (*cmdbuf < 32) {
1304 if (cmdptr == cmd_head) {
1305 strncpy(cmd_hist[cmd_head], cmd_cur,
1306 CMD_BUFLEN);
1307 *(cmd_hist[cmd_head] +
1308 strlen(cmd_hist[cmd_head])-1) = '\0';
1309 }
1310 if (!handle_ctrl_cmd(cmdbuf))
1311 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1312 cmdbuf = cmd_cur;
1313 goto do_full_getstr;
1314 } else {
1315 strncpy(cmd_hist[cmd_head], cmd_cur,
1316 CMD_BUFLEN);
1317 }
1318
1319 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1320 if (cmd_head == cmd_tail)
1321 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1322 }
1323
1324 cmdptr = cmd_head;
1325 diag = kdb_parse(cmdbuf);
1326 if (diag == KDB_NOTFOUND) {
1327 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1328 diag = 0;
1329 }
1330 if (diag == KDB_CMD_GO
1331 || diag == KDB_CMD_CPU
1332 || diag == KDB_CMD_SS
1333 || diag == KDB_CMD_KGDB)
1334 break;
1335
1336 if (diag)
1337 kdb_cmderror(diag);
1338 }
1339 KDB_DEBUG_STATE("kdb_local 9", diag);
1340 return diag;
1341}
1342
1343
1344/*
1345 * kdb_print_state - Print the state data for the current processor
1346 * for debugging.
1347 * Inputs:
1348 * text Identifies the debug point
1349 * value Any integer value to be printed, e.g. reason code.
1350 */
1351void kdb_print_state(const char *text, int value)
1352{
1353 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1354 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1355 kdb_state);
1356}
1357
1358/*
1359 * kdb_main_loop - After initial setup and assignment of the
1360 * controlling cpu, all cpus are in this loop. One cpu is in
1361 * control and will issue the kdb prompt, the others will spin
1362 * until 'go' or cpu switch.
1363 *
1364 * To get a consistent view of the kernel stacks for all
1365 * processes, this routine is invoked from the main kdb code via
1366 * an architecture specific routine. kdba_main_loop is
1367 * responsible for making the kernel stacks consistent for all
1368 * processes, there should be no difference between a blocked
1369 * process and a running process as far as kdb is concerned.
1370 * Inputs:
1371 * reason The reason KDB was invoked
1372 * error The hardware-defined error code
1373 * reason2 kdb's current reason code.
1374 * Initially error but can change
1375 * according to kdb state.
1376 * db_result Result code from break or debug point.
1377 * regs The exception frame at time of fault/breakpoint.
1378 * should always be valid.
1379 * Returns:
1380 * 0 KDB was invoked for an event which it wasn't responsible
1381 * 1 KDB handled the event for which it was invoked.
1382 */
1383int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1384 kdb_dbtrap_t db_result, struct pt_regs *regs)
1385{
1386 int result = 1;
1387 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1388 while (1) {
1389 /*
1390 * All processors except the one that is in control
1391 * will spin here.
1392 */
1393 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1394 while (KDB_STATE(HOLD_CPU)) {
1395 /* state KDB is turned off by kdb_cpu to see if the
1396 * other cpus are still live, each cpu in this loop
1397 * turns it back on.
1398 */
1399 if (!KDB_STATE(KDB))
1400 KDB_STATE_SET(KDB);
1401 }
1402
1403 KDB_STATE_CLEAR(SUPPRESS);
1404 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1405 if (KDB_STATE(LEAVING))
1406 break; /* Another cpu said 'go' */
1407 /* Still using kdb, this processor is in control */
1408 result = kdb_local(reason2, error, regs, db_result);
1409 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1410
1411 if (result == KDB_CMD_CPU)
1412 break;
1413
1414 if (result == KDB_CMD_SS) {
1415 KDB_STATE_SET(DOING_SS);
1416 break;
1417 }
1418
1419 if (result == KDB_CMD_KGDB) {
1420 if (!KDB_STATE(DOING_KGDB))
1421 kdb_printf("Entering please attach debugger "
1422 "or use $D#44+ or $3#33\n");
1423 break;
1424 }
1425 if (result && result != 1 && result != KDB_CMD_GO)
1426 kdb_printf("\nUnexpected kdb_local return code %d\n",
1427 result);
1428 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1429 break;
1430 }
1431 if (KDB_STATE(DOING_SS))
1432 KDB_STATE_CLEAR(SSBPT);
1433
1434 /* Clean up any keyboard devices before leaving */
1435 kdb_kbd_cleanup_state();
1436
1437 return result;
1438}
1439
1440/*
1441 * kdb_mdr - This function implements the guts of the 'mdr', memory
1442 * read command.
1443 * mdr <addr arg>,<byte count>
1444 * Inputs:
1445 * addr Start address
1446 * count Number of bytes
1447 * Returns:
1448 * Always 0. Any errors are detected and printed by kdb_getarea.
1449 */
1450static int kdb_mdr(unsigned long addr, unsigned int count)
1451{
1452 unsigned char c;
1453 while (count--) {
1454 if (kdb_getarea(c, addr))
1455 return 0;
1456 kdb_printf("%02x", c);
1457 addr++;
1458 }
1459 kdb_printf("\n");
1460 return 0;
1461}
1462
1463/*
1464 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1465 * 'md8' 'mdr' and 'mds' commands.
1466 *
1467 * md|mds [<addr arg> [<line count> [<radix>]]]
1468 * mdWcN [<addr arg> [<line count> [<radix>]]]
1469 * where W = is the width (1, 2, 4 or 8) and N is the count.
1470 * for eg., md1c20 reads 20 bytes, 1 at a time.
1471 * mdr <addr arg>,<byte count>
1472 */
1473static void kdb_md_line(const char *fmtstr, unsigned long addr,
1474 int symbolic, int nosect, int bytesperword,
1475 int num, int repeat, int phys)
1476{
1477 /* print just one line of data */
1478 kdb_symtab_t symtab;
1479 char cbuf[32];
1480 char *c = cbuf;
1481 int i;
1482 unsigned long word;
1483
1484 memset(cbuf, '\0', sizeof(cbuf));
1485 if (phys)
1486 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1487 else
1488 kdb_printf(kdb_machreg_fmt0 " ", addr);
1489
1490 for (i = 0; i < num && repeat--; i++) {
1491 if (phys) {
1492 if (kdb_getphysword(&word, addr, bytesperword))
1493 break;
1494 } else if (kdb_getword(&word, addr, bytesperword))
1495 break;
1496 kdb_printf(fmtstr, word);
1497 if (symbolic)
1498 kdbnearsym(word, &symtab);
1499 else
1500 memset(&symtab, 0, sizeof(symtab));
1501 if (symtab.sym_name) {
1502 kdb_symbol_print(word, &symtab, 0);
1503 if (!nosect) {
1504 kdb_printf("\n");
1505 kdb_printf(" %s %s "
1506 kdb_machreg_fmt " "
1507 kdb_machreg_fmt " "
1508 kdb_machreg_fmt, symtab.mod_name,
1509 symtab.sec_name, symtab.sec_start,
1510 symtab.sym_start, symtab.sym_end);
1511 }
1512 addr += bytesperword;
1513 } else {
1514 union {
1515 u64 word;
1516 unsigned char c[8];
1517 } wc;
1518 unsigned char *cp;
1519#ifdef __BIG_ENDIAN
1520 cp = wc.c + 8 - bytesperword;
1521#else
1522 cp = wc.c;
1523#endif
1524 wc.word = word;
1525#define printable_char(c) \
1526 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1527 switch (bytesperword) {
1528 case 8:
1529 *c++ = printable_char(*cp++);
1530 *c++ = printable_char(*cp++);
1531 *c++ = printable_char(*cp++);
1532 *c++ = printable_char(*cp++);
1533 addr += 4;
1534 case 4:
1535 *c++ = printable_char(*cp++);
1536 *c++ = printable_char(*cp++);
1537 addr += 2;
1538 case 2:
1539 *c++ = printable_char(*cp++);
1540 addr++;
1541 case 1:
1542 *c++ = printable_char(*cp++);
1543 addr++;
1544 break;
1545 }
1546#undef printable_char
1547 }
1548 }
1549 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1550 " ", cbuf);
1551}
1552
1553static int kdb_md(int argc, const char **argv)
1554{
1555 static unsigned long last_addr;
1556 static int last_radix, last_bytesperword, last_repeat;
1557 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1558 int nosect = 0;
1559 char fmtchar, fmtstr[64];
1560 unsigned long addr;
1561 unsigned long word;
1562 long offset = 0;
1563 int symbolic = 0;
1564 int valid = 0;
1565 int phys = 0;
1566
1567 kdbgetintenv("MDCOUNT", &mdcount);
1568 kdbgetintenv("RADIX", &radix);
1569 kdbgetintenv("BYTESPERWORD", &bytesperword);
1570
1571 /* Assume 'md <addr>' and start with environment values */
1572 repeat = mdcount * 16 / bytesperword;
1573
1574 if (strcmp(argv[0], "mdr") == 0) {
1575 if (argc != 2)
1576 return KDB_ARGCOUNT;
1577 valid = 1;
1578 } else if (isdigit(argv[0][2])) {
1579 bytesperword = (int)(argv[0][2] - '0');
1580 if (bytesperword == 0) {
1581 bytesperword = last_bytesperword;
1582 if (bytesperword == 0)
1583 bytesperword = 4;
1584 }
1585 last_bytesperword = bytesperword;
1586 repeat = mdcount * 16 / bytesperword;
1587 if (!argv[0][3])
1588 valid = 1;
1589 else if (argv[0][3] == 'c' && argv[0][4]) {
1590 char *p;
1591 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1592 mdcount = ((repeat * bytesperword) + 15) / 16;
1593 valid = !*p;
1594 }
1595 last_repeat = repeat;
1596 } else if (strcmp(argv[0], "md") == 0)
1597 valid = 1;
1598 else if (strcmp(argv[0], "mds") == 0)
1599 valid = 1;
1600 else if (strcmp(argv[0], "mdp") == 0) {
1601 phys = valid = 1;
1602 }
1603 if (!valid)
1604 return KDB_NOTFOUND;
1605
1606 if (argc == 0) {
1607 if (last_addr == 0)
1608 return KDB_ARGCOUNT;
1609 addr = last_addr;
1610 radix = last_radix;
1611 bytesperword = last_bytesperword;
1612 repeat = last_repeat;
1613 mdcount = ((repeat * bytesperword) + 15) / 16;
1614 }
1615
1616 if (argc) {
1617 unsigned long val;
1618 int diag, nextarg = 1;
1619 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1620 &offset, NULL);
1621 if (diag)
1622 return diag;
1623 if (argc > nextarg+2)
1624 return KDB_ARGCOUNT;
1625
1626 if (argc >= nextarg) {
1627 diag = kdbgetularg(argv[nextarg], &val);
1628 if (!diag) {
1629 mdcount = (int) val;
1630 repeat = mdcount * 16 / bytesperword;
1631 }
1632 }
1633 if (argc >= nextarg+1) {
1634 diag = kdbgetularg(argv[nextarg+1], &val);
1635 if (!diag)
1636 radix = (int) val;
1637 }
1638 }
1639
1640 if (strcmp(argv[0], "mdr") == 0)
1641 return kdb_mdr(addr, mdcount);
1642
1643 switch (radix) {
1644 case 10:
1645 fmtchar = 'd';
1646 break;
1647 case 16:
1648 fmtchar = 'x';
1649 break;
1650 case 8:
1651 fmtchar = 'o';
1652 break;
1653 default:
1654 return KDB_BADRADIX;
1655 }
1656
1657 last_radix = radix;
1658
1659 if (bytesperword > KDB_WORD_SIZE)
1660 return KDB_BADWIDTH;
1661
1662 switch (bytesperword) {
1663 case 8:
1664 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1665 break;
1666 case 4:
1667 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1668 break;
1669 case 2:
1670 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1671 break;
1672 case 1:
1673 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1674 break;
1675 default:
1676 return KDB_BADWIDTH;
1677 }
1678
1679 last_repeat = repeat;
1680 last_bytesperword = bytesperword;
1681
1682 if (strcmp(argv[0], "mds") == 0) {
1683 symbolic = 1;
1684 /* Do not save these changes as last_*, they are temporary mds
1685 * overrides.
1686 */
1687 bytesperword = KDB_WORD_SIZE;
1688 repeat = mdcount;
1689 kdbgetintenv("NOSECT", &nosect);
1690 }
1691
1692 /* Round address down modulo BYTESPERWORD */
1693
1694 addr &= ~(bytesperword-1);
1695
1696 while (repeat > 0) {
1697 unsigned long a;
1698 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1699
1700 if (KDB_FLAG(CMD_INTERRUPT))
1701 return 0;
1702 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1703 if (phys) {
1704 if (kdb_getphysword(&word, a, bytesperword)
1705 || word)
1706 break;
1707 } else if (kdb_getword(&word, a, bytesperword) || word)
1708 break;
1709 }
1710 n = min(num, repeat);
1711 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1712 num, repeat, phys);
1713 addr += bytesperword * n;
1714 repeat -= n;
1715 z = (z + num - 1) / num;
1716 if (z > 2) {
1717 int s = num * (z-2);
1718 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1719 " zero suppressed\n",
1720 addr, addr + bytesperword * s - 1);
1721 addr += bytesperword * s;
1722 repeat -= s;
1723 }
1724 }
1725 last_addr = addr;
1726
1727 return 0;
1728}
1729
1730/*
1731 * kdb_mm - This function implements the 'mm' command.
1732 * mm address-expression new-value
1733 * Remarks:
1734 * mm works on machine words, mmW works on bytes.
1735 */
1736static int kdb_mm(int argc, const char **argv)
1737{
1738 int diag;
1739 unsigned long addr;
1740 long offset = 0;
1741 unsigned long contents;
1742 int nextarg;
1743 int width;
1744
1745 if (argv[0][2] && !isdigit(argv[0][2]))
1746 return KDB_NOTFOUND;
1747
1748 if (argc < 2)
1749 return KDB_ARGCOUNT;
1750
1751 nextarg = 1;
1752 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1753 if (diag)
1754 return diag;
1755
1756 if (nextarg > argc)
1757 return KDB_ARGCOUNT;
1758 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1759 if (diag)
1760 return diag;
1761
1762 if (nextarg != argc + 1)
1763 return KDB_ARGCOUNT;
1764
1765 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1766 diag = kdb_putword(addr, contents, width);
1767 if (diag)
1768 return diag;
1769
1770 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1771
1772 return 0;
1773}
1774
1775/*
1776 * kdb_go - This function implements the 'go' command.
1777 * go [address-expression]
1778 */
1779static int kdb_go(int argc, const char **argv)
1780{
1781 unsigned long addr;
1782 int diag;
1783 int nextarg;
1784 long offset;
1785
1786 if (raw_smp_processor_id() != kdb_initial_cpu) {
1787 kdb_printf("go must execute on the entry cpu, "
1788 "please use \"cpu %d\" and then execute go\n",
1789 kdb_initial_cpu);
1790 return KDB_BADCPUNUM;
1791 }
1792 if (argc == 1) {
1793 nextarg = 1;
1794 diag = kdbgetaddrarg(argc, argv, &nextarg,
1795 &addr, &offset, NULL);
1796 if (diag)
1797 return diag;
1798 } else if (argc) {
1799 return KDB_ARGCOUNT;
1800 }
1801
1802 diag = KDB_CMD_GO;
1803 if (KDB_FLAG(CATASTROPHIC)) {
1804 kdb_printf("Catastrophic error detected\n");
1805 kdb_printf("kdb_continue_catastrophic=%d, ",
1806 kdb_continue_catastrophic);
1807 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1808 kdb_printf("type go a second time if you really want "
1809 "to continue\n");
1810 return 0;
1811 }
1812 if (kdb_continue_catastrophic == 2) {
1813 kdb_printf("forcing reboot\n");
1814 kdb_reboot(0, NULL);
1815 }
1816 kdb_printf("attempting to continue\n");
1817 }
1818 return diag;
1819}
1820
1821/*
1822 * kdb_rd - This function implements the 'rd' command.
1823 */
1824static int kdb_rd(int argc, const char **argv)
1825{
1826 int len = kdb_check_regs();
1827#if DBG_MAX_REG_NUM > 0
1828 int i;
1829 char *rname;
1830 int rsize;
1831 u64 reg64;
1832 u32 reg32;
1833 u16 reg16;
1834 u8 reg8;
1835
1836 if (len)
1837 return len;
1838
1839 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1840 rsize = dbg_reg_def[i].size * 2;
1841 if (rsize > 16)
1842 rsize = 2;
1843 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1844 len = 0;
1845 kdb_printf("\n");
1846 }
1847 if (len)
1848 len += kdb_printf(" ");
1849 switch(dbg_reg_def[i].size * 8) {
1850 case 8:
1851 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1852 if (!rname)
1853 break;
1854 len += kdb_printf("%s: %02x", rname, reg8);
1855 break;
1856 case 16:
1857 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1858 if (!rname)
1859 break;
1860 len += kdb_printf("%s: %04x", rname, reg16);
1861 break;
1862 case 32:
1863 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1864 if (!rname)
1865 break;
1866 len += kdb_printf("%s: %08x", rname, reg32);
1867 break;
1868 case 64:
1869 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1870 if (!rname)
1871 break;
1872 len += kdb_printf("%s: %016llx", rname, reg64);
1873 break;
1874 default:
1875 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1876 }
1877 }
1878 kdb_printf("\n");
1879#else
1880 if (len)
1881 return len;
1882
1883 kdb_dumpregs(kdb_current_regs);
1884#endif
1885 return 0;
1886}
1887
1888/*
1889 * kdb_rm - This function implements the 'rm' (register modify) command.
1890 * rm register-name new-contents
1891 * Remarks:
1892 * Allows register modification with the same restrictions as gdb
1893 */
1894static int kdb_rm(int argc, const char **argv)
1895{
1896#if DBG_MAX_REG_NUM > 0
1897 int diag;
1898 const char *rname;
1899 int i;
1900 u64 reg64;
1901 u32 reg32;
1902 u16 reg16;
1903 u8 reg8;
1904
1905 if (argc != 2)
1906 return KDB_ARGCOUNT;
1907 /*
1908 * Allow presence or absence of leading '%' symbol.
1909 */
1910 rname = argv[1];
1911 if (*rname == '%')
1912 rname++;
1913
1914 diag = kdbgetu64arg(argv[2], ®64);
1915 if (diag)
1916 return diag;
1917
1918 diag = kdb_check_regs();
1919 if (diag)
1920 return diag;
1921
1922 diag = KDB_BADREG;
1923 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1924 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1925 diag = 0;
1926 break;
1927 }
1928 }
1929 if (!diag) {
1930 switch(dbg_reg_def[i].size * 8) {
1931 case 8:
1932 reg8 = reg64;
1933 dbg_set_reg(i, ®8, kdb_current_regs);
1934 break;
1935 case 16:
1936 reg16 = reg64;
1937 dbg_set_reg(i, ®16, kdb_current_regs);
1938 break;
1939 case 32:
1940 reg32 = reg64;
1941 dbg_set_reg(i, ®32, kdb_current_regs);
1942 break;
1943 case 64:
1944 dbg_set_reg(i, ®64, kdb_current_regs);
1945 break;
1946 }
1947 }
1948 return diag;
1949#else
1950 kdb_printf("ERROR: Register set currently not implemented\n");
1951 return 0;
1952#endif
1953}
1954
1955#if defined(CONFIG_MAGIC_SYSRQ)
1956/*
1957 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1958 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1959 * sr <magic-sysrq-code>
1960 */
1961static int kdb_sr(int argc, const char **argv)
1962{
1963 bool check_mask =
1964 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1965
1966 if (argc != 1)
1967 return KDB_ARGCOUNT;
1968
1969 kdb_trap_printk++;
1970 __handle_sysrq(*argv[1], check_mask);
1971 kdb_trap_printk--;
1972
1973 return 0;
1974}
1975#endif /* CONFIG_MAGIC_SYSRQ */
1976
1977/*
1978 * kdb_ef - This function implements the 'regs' (display exception
1979 * frame) command. This command takes an address and expects to
1980 * find an exception frame at that address, formats and prints
1981 * it.
1982 * regs address-expression
1983 * Remarks:
1984 * Not done yet.
1985 */
1986static int kdb_ef(int argc, const char **argv)
1987{
1988 int diag;
1989 unsigned long addr;
1990 long offset;
1991 int nextarg;
1992
1993 if (argc != 1)
1994 return KDB_ARGCOUNT;
1995
1996 nextarg = 1;
1997 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1998 if (diag)
1999 return diag;
2000 show_regs((struct pt_regs *)addr);
2001 return 0;
2002}
2003
2004#if defined(CONFIG_MODULES)
2005/*
2006 * kdb_lsmod - This function implements the 'lsmod' command. Lists
2007 * currently loaded kernel modules.
2008 * Mostly taken from userland lsmod.
2009 */
2010static int kdb_lsmod(int argc, const char **argv)
2011{
2012 struct module *mod;
2013
2014 if (argc != 0)
2015 return KDB_ARGCOUNT;
2016
2017 kdb_printf("Module Size modstruct Used by\n");
2018 list_for_each_entry(mod, kdb_modules, list) {
2019 if (mod->state == MODULE_STATE_UNFORMED)
2020 continue;
2021
2022 kdb_printf("%-20s%8u 0x%p ", mod->name,
2023 mod->core_layout.size, (void *)mod);
2024#ifdef CONFIG_MODULE_UNLOAD
2025 kdb_printf("%4d ", module_refcount(mod));
2026#endif
2027 if (mod->state == MODULE_STATE_GOING)
2028 kdb_printf(" (Unloading)");
2029 else if (mod->state == MODULE_STATE_COMING)
2030 kdb_printf(" (Loading)");
2031 else
2032 kdb_printf(" (Live)");
2033 kdb_printf(" 0x%p", mod->core_layout.base);
2034
2035#ifdef CONFIG_MODULE_UNLOAD
2036 {
2037 struct module_use *use;
2038 kdb_printf(" [ ");
2039 list_for_each_entry(use, &mod->source_list,
2040 source_list)
2041 kdb_printf("%s ", use->target->name);
2042 kdb_printf("]\n");
2043 }
2044#endif
2045 }
2046
2047 return 0;
2048}
2049
2050#endif /* CONFIG_MODULES */
2051
2052/*
2053 * kdb_env - This function implements the 'env' command. Display the
2054 * current environment variables.
2055 */
2056
2057static int kdb_env(int argc, const char **argv)
2058{
2059 int i;
2060
2061 for (i = 0; i < __nenv; i++) {
2062 if (__env[i])
2063 kdb_printf("%s\n", __env[i]);
2064 }
2065
2066 if (KDB_DEBUG(MASK))
2067 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2068
2069 return 0;
2070}
2071
2072#ifdef CONFIG_PRINTK
2073/*
2074 * kdb_dmesg - This function implements the 'dmesg' command to display
2075 * the contents of the syslog buffer.
2076 * dmesg [lines] [adjust]
2077 */
2078static int kdb_dmesg(int argc, const char **argv)
2079{
2080 int diag;
2081 int logging;
2082 int lines = 0;
2083 int adjust = 0;
2084 int n = 0;
2085 int skip = 0;
2086 struct kmsg_dumper dumper = { .active = 1 };
2087 size_t len;
2088 char buf[201];
2089
2090 if (argc > 2)
2091 return KDB_ARGCOUNT;
2092 if (argc) {
2093 char *cp;
2094 lines = simple_strtol(argv[1], &cp, 0);
2095 if (*cp)
2096 lines = 0;
2097 if (argc > 1) {
2098 adjust = simple_strtoul(argv[2], &cp, 0);
2099 if (*cp || adjust < 0)
2100 adjust = 0;
2101 }
2102 }
2103
2104 /* disable LOGGING if set */
2105 diag = kdbgetintenv("LOGGING", &logging);
2106 if (!diag && logging) {
2107 const char *setargs[] = { "set", "LOGGING", "0" };
2108 kdb_set(2, setargs);
2109 }
2110
2111 kmsg_dump_rewind_nolock(&dumper);
2112 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2113 n++;
2114
2115 if (lines < 0) {
2116 if (adjust >= n)
2117 kdb_printf("buffer only contains %d lines, nothing "
2118 "printed\n", n);
2119 else if (adjust - lines >= n)
2120 kdb_printf("buffer only contains %d lines, last %d "
2121 "lines printed\n", n, n - adjust);
2122 skip = adjust;
2123 lines = abs(lines);
2124 } else if (lines > 0) {
2125 skip = n - lines - adjust;
2126 lines = abs(lines);
2127 if (adjust >= n) {
2128 kdb_printf("buffer only contains %d lines, "
2129 "nothing printed\n", n);
2130 skip = n;
2131 } else if (skip < 0) {
2132 lines += skip;
2133 skip = 0;
2134 kdb_printf("buffer only contains %d lines, first "
2135 "%d lines printed\n", n, lines);
2136 }
2137 } else {
2138 lines = n;
2139 }
2140
2141 if (skip >= n || skip < 0)
2142 return 0;
2143
2144 kmsg_dump_rewind_nolock(&dumper);
2145 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2146 if (skip) {
2147 skip--;
2148 continue;
2149 }
2150 if (!lines--)
2151 break;
2152 if (KDB_FLAG(CMD_INTERRUPT))
2153 return 0;
2154
2155 kdb_printf("%.*s\n", (int)len - 1, buf);
2156 }
2157
2158 return 0;
2159}
2160#endif /* CONFIG_PRINTK */
2161
2162/* Make sure we balance enable/disable calls, must disable first. */
2163static atomic_t kdb_nmi_disabled;
2164
2165static int kdb_disable_nmi(int argc, const char *argv[])
2166{
2167 if (atomic_read(&kdb_nmi_disabled))
2168 return 0;
2169 atomic_set(&kdb_nmi_disabled, 1);
2170 arch_kgdb_ops.enable_nmi(0);
2171 return 0;
2172}
2173
2174static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2175{
2176 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2177 return -EINVAL;
2178 arch_kgdb_ops.enable_nmi(1);
2179 return 0;
2180}
2181
2182static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2183 .set = kdb_param_enable_nmi,
2184};
2185module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2186
2187/*
2188 * kdb_cpu - This function implements the 'cpu' command.
2189 * cpu [<cpunum>]
2190 * Returns:
2191 * KDB_CMD_CPU for success, a kdb diagnostic if error
2192 */
2193static void kdb_cpu_status(void)
2194{
2195 int i, start_cpu, first_print = 1;
2196 char state, prev_state = '?';
2197
2198 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2199 kdb_printf("Available cpus: ");
2200 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2201 if (!cpu_online(i)) {
2202 state = 'F'; /* cpu is offline */
2203 } else if (!kgdb_info[i].enter_kgdb) {
2204 state = 'D'; /* cpu is online but unresponsive */
2205 } else {
2206 state = ' '; /* cpu is responding to kdb */
2207 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2208 state = 'I'; /* idle task */
2209 }
2210 if (state != prev_state) {
2211 if (prev_state != '?') {
2212 if (!first_print)
2213 kdb_printf(", ");
2214 first_print = 0;
2215 kdb_printf("%d", start_cpu);
2216 if (start_cpu < i-1)
2217 kdb_printf("-%d", i-1);
2218 if (prev_state != ' ')
2219 kdb_printf("(%c)", prev_state);
2220 }
2221 prev_state = state;
2222 start_cpu = i;
2223 }
2224 }
2225 /* print the trailing cpus, ignoring them if they are all offline */
2226 if (prev_state != 'F') {
2227 if (!first_print)
2228 kdb_printf(", ");
2229 kdb_printf("%d", start_cpu);
2230 if (start_cpu < i-1)
2231 kdb_printf("-%d", i-1);
2232 if (prev_state != ' ')
2233 kdb_printf("(%c)", prev_state);
2234 }
2235 kdb_printf("\n");
2236}
2237
2238static int kdb_cpu(int argc, const char **argv)
2239{
2240 unsigned long cpunum;
2241 int diag;
2242
2243 if (argc == 0) {
2244 kdb_cpu_status();
2245 return 0;
2246 }
2247
2248 if (argc != 1)
2249 return KDB_ARGCOUNT;
2250
2251 diag = kdbgetularg(argv[1], &cpunum);
2252 if (diag)
2253 return diag;
2254
2255 /*
2256 * Validate cpunum
2257 */
2258 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2259 return KDB_BADCPUNUM;
2260
2261 dbg_switch_cpu = cpunum;
2262
2263 /*
2264 * Switch to other cpu
2265 */
2266 return KDB_CMD_CPU;
2267}
2268
2269/* The user may not realize that ps/bta with no parameters does not print idle
2270 * or sleeping system daemon processes, so tell them how many were suppressed.
2271 */
2272void kdb_ps_suppressed(void)
2273{
2274 int idle = 0, daemon = 0;
2275 unsigned long mask_I = kdb_task_state_string("I"),
2276 mask_M = kdb_task_state_string("M");
2277 unsigned long cpu;
2278 const struct task_struct *p, *g;
2279 for_each_online_cpu(cpu) {
2280 p = kdb_curr_task(cpu);
2281 if (kdb_task_state(p, mask_I))
2282 ++idle;
2283 }
2284 kdb_do_each_thread(g, p) {
2285 if (kdb_task_state(p, mask_M))
2286 ++daemon;
2287 } kdb_while_each_thread(g, p);
2288 if (idle || daemon) {
2289 if (idle)
2290 kdb_printf("%d idle process%s (state I)%s\n",
2291 idle, idle == 1 ? "" : "es",
2292 daemon ? " and " : "");
2293 if (daemon)
2294 kdb_printf("%d sleeping system daemon (state M) "
2295 "process%s", daemon,
2296 daemon == 1 ? "" : "es");
2297 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2298 }
2299}
2300
2301/*
2302 * kdb_ps - This function implements the 'ps' command which shows a
2303 * list of the active processes.
2304 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2305 */
2306void kdb_ps1(const struct task_struct *p)
2307{
2308 int cpu;
2309 unsigned long tmp;
2310
2311 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2312 return;
2313
2314 cpu = kdb_process_cpu(p);
2315 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2316 (void *)p, p->pid, p->parent->pid,
2317 kdb_task_has_cpu(p), kdb_process_cpu(p),
2318 kdb_task_state_char(p),
2319 (void *)(&p->thread),
2320 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2321 p->comm);
2322 if (kdb_task_has_cpu(p)) {
2323 if (!KDB_TSK(cpu)) {
2324 kdb_printf(" Error: no saved data for this cpu\n");
2325 } else {
2326 if (KDB_TSK(cpu) != p)
2327 kdb_printf(" Error: does not match running "
2328 "process table (0x%p)\n", KDB_TSK(cpu));
2329 }
2330 }
2331}
2332
2333static int kdb_ps(int argc, const char **argv)
2334{
2335 struct task_struct *g, *p;
2336 unsigned long mask, cpu;
2337
2338 if (argc == 0)
2339 kdb_ps_suppressed();
2340 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2341 (int)(2*sizeof(void *))+2, "Task Addr",
2342 (int)(2*sizeof(void *))+2, "Thread");
2343 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2344 /* Run the active tasks first */
2345 for_each_online_cpu(cpu) {
2346 if (KDB_FLAG(CMD_INTERRUPT))
2347 return 0;
2348 p = kdb_curr_task(cpu);
2349 if (kdb_task_state(p, mask))
2350 kdb_ps1(p);
2351 }
2352 kdb_printf("\n");
2353 /* Now the real tasks */
2354 kdb_do_each_thread(g, p) {
2355 if (KDB_FLAG(CMD_INTERRUPT))
2356 return 0;
2357 if (kdb_task_state(p, mask))
2358 kdb_ps1(p);
2359 } kdb_while_each_thread(g, p);
2360
2361 return 0;
2362}
2363
2364/*
2365 * kdb_pid - This function implements the 'pid' command which switches
2366 * the currently active process.
2367 * pid [<pid> | R]
2368 */
2369static int kdb_pid(int argc, const char **argv)
2370{
2371 struct task_struct *p;
2372 unsigned long val;
2373 int diag;
2374
2375 if (argc > 1)
2376 return KDB_ARGCOUNT;
2377
2378 if (argc) {
2379 if (strcmp(argv[1], "R") == 0) {
2380 p = KDB_TSK(kdb_initial_cpu);
2381 } else {
2382 diag = kdbgetularg(argv[1], &val);
2383 if (diag)
2384 return KDB_BADINT;
2385
2386 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2387 if (!p) {
2388 kdb_printf("No task with pid=%d\n", (pid_t)val);
2389 return 0;
2390 }
2391 }
2392 kdb_set_current_task(p);
2393 }
2394 kdb_printf("KDB current process is %s(pid=%d)\n",
2395 kdb_current_task->comm,
2396 kdb_current_task->pid);
2397
2398 return 0;
2399}
2400
2401static int kdb_kgdb(int argc, const char **argv)
2402{
2403 return KDB_CMD_KGDB;
2404}
2405
2406/*
2407 * kdb_help - This function implements the 'help' and '?' commands.
2408 */
2409static int kdb_help(int argc, const char **argv)
2410{
2411 kdbtab_t *kt;
2412 int i;
2413
2414 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2415 kdb_printf("-----------------------------"
2416 "-----------------------------\n");
2417 for_each_kdbcmd(kt, i) {
2418 char *space = "";
2419 if (KDB_FLAG(CMD_INTERRUPT))
2420 return 0;
2421 if (!kt->cmd_name)
2422 continue;
2423 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2424 continue;
2425 if (strlen(kt->cmd_usage) > 20)
2426 space = "\n ";
2427 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2428 kt->cmd_usage, space, kt->cmd_help);
2429 }
2430 return 0;
2431}
2432
2433/*
2434 * kdb_kill - This function implements the 'kill' commands.
2435 */
2436static int kdb_kill(int argc, const char **argv)
2437{
2438 long sig, pid;
2439 char *endp;
2440 struct task_struct *p;
2441 struct siginfo info;
2442
2443 if (argc != 2)
2444 return KDB_ARGCOUNT;
2445
2446 sig = simple_strtol(argv[1], &endp, 0);
2447 if (*endp)
2448 return KDB_BADINT;
2449 if (sig >= 0) {
2450 kdb_printf("Invalid signal parameter.<-signal>\n");
2451 return 0;
2452 }
2453 sig = -sig;
2454
2455 pid = simple_strtol(argv[2], &endp, 0);
2456 if (*endp)
2457 return KDB_BADINT;
2458 if (pid <= 0) {
2459 kdb_printf("Process ID must be large than 0.\n");
2460 return 0;
2461 }
2462
2463 /* Find the process. */
2464 p = find_task_by_pid_ns(pid, &init_pid_ns);
2465 if (!p) {
2466 kdb_printf("The specified process isn't found.\n");
2467 return 0;
2468 }
2469 p = p->group_leader;
2470 info.si_signo = sig;
2471 info.si_errno = 0;
2472 info.si_code = SI_USER;
2473 info.si_pid = pid; /* same capabilities as process being signalled */
2474 info.si_uid = 0; /* kdb has root authority */
2475 kdb_send_sig_info(p, &info);
2476 return 0;
2477}
2478
2479struct kdb_tm {
2480 int tm_sec; /* seconds */
2481 int tm_min; /* minutes */
2482 int tm_hour; /* hours */
2483 int tm_mday; /* day of the month */
2484 int tm_mon; /* month */
2485 int tm_year; /* year */
2486};
2487
2488static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2489{
2490 /* This will work from 1970-2099, 2100 is not a leap year */
2491 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2492 31, 30, 31, 30, 31 };
2493 memset(tm, 0, sizeof(*tm));
2494 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2495 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2496 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2497 tm->tm_min = tm->tm_sec / 60 % 60;
2498 tm->tm_hour = tm->tm_sec / 60 / 60;
2499 tm->tm_sec = tm->tm_sec % 60;
2500 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2501 tm->tm_mday %= (4*365+1);
2502 mon_day[1] = 29;
2503 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2504 tm->tm_mday -= mon_day[tm->tm_mon];
2505 if (++tm->tm_mon == 12) {
2506 tm->tm_mon = 0;
2507 ++tm->tm_year;
2508 mon_day[1] = 28;
2509 }
2510 }
2511 ++tm->tm_mday;
2512}
2513
2514/*
2515 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2516 * I cannot call that code directly from kdb, it has an unconditional
2517 * cli()/sti() and calls routines that take locks which can stop the debugger.
2518 */
2519static void kdb_sysinfo(struct sysinfo *val)
2520{
2521 struct timespec uptime;
2522 ktime_get_ts(&uptime);
2523 memset(val, 0, sizeof(*val));
2524 val->uptime = uptime.tv_sec;
2525 val->loads[0] = avenrun[0];
2526 val->loads[1] = avenrun[1];
2527 val->loads[2] = avenrun[2];
2528 val->procs = nr_threads-1;
2529 si_meminfo(val);
2530
2531 return;
2532}
2533
2534/*
2535 * kdb_summary - This function implements the 'summary' command.
2536 */
2537static int kdb_summary(int argc, const char **argv)
2538{
2539 struct timespec now;
2540 struct kdb_tm tm;
2541 struct sysinfo val;
2542
2543 if (argc)
2544 return KDB_ARGCOUNT;
2545
2546 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2547 kdb_printf("release %s\n", init_uts_ns.name.release);
2548 kdb_printf("version %s\n", init_uts_ns.name.version);
2549 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2550 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2551 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2552 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2553
2554 now = __current_kernel_time();
2555 kdb_gmtime(&now, &tm);
2556 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2557 "tz_minuteswest %d\n",
2558 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2559 tm.tm_hour, tm.tm_min, tm.tm_sec,
2560 sys_tz.tz_minuteswest);
2561
2562 kdb_sysinfo(&val);
2563 kdb_printf("uptime ");
2564 if (val.uptime > (24*60*60)) {
2565 int days = val.uptime / (24*60*60);
2566 val.uptime %= (24*60*60);
2567 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2568 }
2569 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2570
2571 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2572
2573#define LOAD_INT(x) ((x) >> FSHIFT)
2574#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2575 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2576 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2577 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2578 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2579#undef LOAD_INT
2580#undef LOAD_FRAC
2581 /* Display in kilobytes */
2582#define K(x) ((x) << (PAGE_SHIFT - 10))
2583 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2584 "Buffers: %8lu kB\n",
2585 K(val.totalram), K(val.freeram), K(val.bufferram));
2586 return 0;
2587}
2588
2589/*
2590 * kdb_per_cpu - This function implements the 'per_cpu' command.
2591 */
2592static int kdb_per_cpu(int argc, const char **argv)
2593{
2594 char fmtstr[64];
2595 int cpu, diag, nextarg = 1;
2596 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2597
2598 if (argc < 1 || argc > 3)
2599 return KDB_ARGCOUNT;
2600
2601 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2602 if (diag)
2603 return diag;
2604
2605 if (argc >= 2) {
2606 diag = kdbgetularg(argv[2], &bytesperword);
2607 if (diag)
2608 return diag;
2609 }
2610 if (!bytesperword)
2611 bytesperword = KDB_WORD_SIZE;
2612 else if (bytesperword > KDB_WORD_SIZE)
2613 return KDB_BADWIDTH;
2614 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2615 if (argc >= 3) {
2616 diag = kdbgetularg(argv[3], &whichcpu);
2617 if (diag)
2618 return diag;
2619 if (!cpu_online(whichcpu)) {
2620 kdb_printf("cpu %ld is not online\n", whichcpu);
2621 return KDB_BADCPUNUM;
2622 }
2623 }
2624
2625 /* Most architectures use __per_cpu_offset[cpu], some use
2626 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2627 */
2628#ifdef __per_cpu_offset
2629#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2630#else
2631#ifdef CONFIG_SMP
2632#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2633#else
2634#define KDB_PCU(cpu) 0
2635#endif
2636#endif
2637 for_each_online_cpu(cpu) {
2638 if (KDB_FLAG(CMD_INTERRUPT))
2639 return 0;
2640
2641 if (whichcpu != ~0UL && whichcpu != cpu)
2642 continue;
2643 addr = symaddr + KDB_PCU(cpu);
2644 diag = kdb_getword(&val, addr, bytesperword);
2645 if (diag) {
2646 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2647 "read, diag=%d\n", cpu, addr, diag);
2648 continue;
2649 }
2650 kdb_printf("%5d ", cpu);
2651 kdb_md_line(fmtstr, addr,
2652 bytesperword == KDB_WORD_SIZE,
2653 1, bytesperword, 1, 1, 0);
2654 }
2655#undef KDB_PCU
2656 return 0;
2657}
2658
2659/*
2660 * display help for the use of cmd | grep pattern
2661 */
2662static int kdb_grep_help(int argc, const char **argv)
2663{
2664 kdb_printf("Usage of cmd args | grep pattern:\n");
2665 kdb_printf(" Any command's output may be filtered through an ");
2666 kdb_printf("emulated 'pipe'.\n");
2667 kdb_printf(" 'grep' is just a key word.\n");
2668 kdb_printf(" The pattern may include a very limited set of "
2669 "metacharacters:\n");
2670 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2671 kdb_printf(" And if there are spaces in the pattern, you may "
2672 "quote it:\n");
2673 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2674 " or \"^pat tern$\"\n");
2675 return 0;
2676}
2677
2678/*
2679 * kdb_register_flags - This function is used to register a kernel
2680 * debugger command.
2681 * Inputs:
2682 * cmd Command name
2683 * func Function to execute the command
2684 * usage A simple usage string showing arguments
2685 * help A simple help string describing command
2686 * repeat Does the command auto repeat on enter?
2687 * Returns:
2688 * zero for success, one if a duplicate command.
2689 */
2690#define kdb_command_extend 50 /* arbitrary */
2691int kdb_register_flags(char *cmd,
2692 kdb_func_t func,
2693 char *usage,
2694 char *help,
2695 short minlen,
2696 kdb_cmdflags_t flags)
2697{
2698 int i;
2699 kdbtab_t *kp;
2700
2701 /*
2702 * Brute force method to determine duplicates
2703 */
2704 for_each_kdbcmd(kp, i) {
2705 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2706 kdb_printf("Duplicate kdb command registered: "
2707 "%s, func %p help %s\n", cmd, func, help);
2708 return 1;
2709 }
2710 }
2711
2712 /*
2713 * Insert command into first available location in table
2714 */
2715 for_each_kdbcmd(kp, i) {
2716 if (kp->cmd_name == NULL)
2717 break;
2718 }
2719
2720 if (i >= kdb_max_commands) {
2721 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2722 kdb_command_extend) * sizeof(*new), GFP_KDB);
2723 if (!new) {
2724 kdb_printf("Could not allocate new kdb_command "
2725 "table\n");
2726 return 1;
2727 }
2728 if (kdb_commands) {
2729 memcpy(new, kdb_commands,
2730 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2731 kfree(kdb_commands);
2732 }
2733 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2734 kdb_command_extend * sizeof(*new));
2735 kdb_commands = new;
2736 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2737 kdb_max_commands += kdb_command_extend;
2738 }
2739
2740 kp->cmd_name = cmd;
2741 kp->cmd_func = func;
2742 kp->cmd_usage = usage;
2743 kp->cmd_help = help;
2744 kp->cmd_minlen = minlen;
2745 kp->cmd_flags = flags;
2746
2747 return 0;
2748}
2749EXPORT_SYMBOL_GPL(kdb_register_flags);
2750
2751
2752/*
2753 * kdb_register - Compatibility register function for commands that do
2754 * not need to specify a repeat state. Equivalent to
2755 * kdb_register_flags with flags set to 0.
2756 * Inputs:
2757 * cmd Command name
2758 * func Function to execute the command
2759 * usage A simple usage string showing arguments
2760 * help A simple help string describing command
2761 * Returns:
2762 * zero for success, one if a duplicate command.
2763 */
2764int kdb_register(char *cmd,
2765 kdb_func_t func,
2766 char *usage,
2767 char *help,
2768 short minlen)
2769{
2770 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2771}
2772EXPORT_SYMBOL_GPL(kdb_register);
2773
2774/*
2775 * kdb_unregister - This function is used to unregister a kernel
2776 * debugger command. It is generally called when a module which
2777 * implements kdb commands is unloaded.
2778 * Inputs:
2779 * cmd Command name
2780 * Returns:
2781 * zero for success, one command not registered.
2782 */
2783int kdb_unregister(char *cmd)
2784{
2785 int i;
2786 kdbtab_t *kp;
2787
2788 /*
2789 * find the command.
2790 */
2791 for_each_kdbcmd(kp, i) {
2792 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2793 kp->cmd_name = NULL;
2794 return 0;
2795 }
2796 }
2797
2798 /* Couldn't find it. */
2799 return 1;
2800}
2801EXPORT_SYMBOL_GPL(kdb_unregister);
2802
2803/* Initialize the kdb command table. */
2804static void __init kdb_inittab(void)
2805{
2806 int i;
2807 kdbtab_t *kp;
2808
2809 for_each_kdbcmd(kp, i)
2810 kp->cmd_name = NULL;
2811
2812 kdb_register_flags("md", kdb_md, "<vaddr>",
2813 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2814 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2815 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2816 "Display Raw Memory", 0,
2817 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2818 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2819 "Display Physical Memory", 0,
2820 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2821 kdb_register_flags("mds", kdb_md, "<vaddr>",
2822 "Display Memory Symbolically", 0,
2823 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2824 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2825 "Modify Memory Contents", 0,
2826 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2827 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2828 "Continue Execution", 1,
2829 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2830 kdb_register_flags("rd", kdb_rd, "",
2831 "Display Registers", 0,
2832 KDB_ENABLE_REG_READ);
2833 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2834 "Modify Registers", 0,
2835 KDB_ENABLE_REG_WRITE);
2836 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2837 "Display exception frame", 0,
2838 KDB_ENABLE_MEM_READ);
2839 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2840 "Stack traceback", 1,
2841 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2842 kdb_register_flags("btp", kdb_bt, "<pid>",
2843 "Display stack for process <pid>", 0,
2844 KDB_ENABLE_INSPECT);
2845 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2846 "Backtrace all processes matching state flag", 0,
2847 KDB_ENABLE_INSPECT);
2848 kdb_register_flags("btc", kdb_bt, "",
2849 "Backtrace current process on each cpu", 0,
2850 KDB_ENABLE_INSPECT);
2851 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2852 "Backtrace process given its struct task address", 0,
2853 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2854 kdb_register_flags("env", kdb_env, "",
2855 "Show environment variables", 0,
2856 KDB_ENABLE_ALWAYS_SAFE);
2857 kdb_register_flags("set", kdb_set, "",
2858 "Set environment variables", 0,
2859 KDB_ENABLE_ALWAYS_SAFE);
2860 kdb_register_flags("help", kdb_help, "",
2861 "Display Help Message", 1,
2862 KDB_ENABLE_ALWAYS_SAFE);
2863 kdb_register_flags("?", kdb_help, "",
2864 "Display Help Message", 0,
2865 KDB_ENABLE_ALWAYS_SAFE);
2866 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2867 "Switch to new cpu", 0,
2868 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2869 kdb_register_flags("kgdb", kdb_kgdb, "",
2870 "Enter kgdb mode", 0, 0);
2871 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2872 "Display active task list", 0,
2873 KDB_ENABLE_INSPECT);
2874 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2875 "Switch to another task", 0,
2876 KDB_ENABLE_INSPECT);
2877 kdb_register_flags("reboot", kdb_reboot, "",
2878 "Reboot the machine immediately", 0,
2879 KDB_ENABLE_REBOOT);
2880#if defined(CONFIG_MODULES)
2881 kdb_register_flags("lsmod", kdb_lsmod, "",
2882 "List loaded kernel modules", 0,
2883 KDB_ENABLE_INSPECT);
2884#endif
2885#if defined(CONFIG_MAGIC_SYSRQ)
2886 kdb_register_flags("sr", kdb_sr, "<key>",
2887 "Magic SysRq key", 0,
2888 KDB_ENABLE_ALWAYS_SAFE);
2889#endif
2890#if defined(CONFIG_PRINTK)
2891 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2892 "Display syslog buffer", 0,
2893 KDB_ENABLE_ALWAYS_SAFE);
2894#endif
2895 if (arch_kgdb_ops.enable_nmi) {
2896 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2897 "Disable NMI entry to KDB", 0,
2898 KDB_ENABLE_ALWAYS_SAFE);
2899 }
2900 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2901 "Define a set of commands, down to endefcmd", 0,
2902 KDB_ENABLE_ALWAYS_SAFE);
2903 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2904 "Send a signal to a process", 0,
2905 KDB_ENABLE_SIGNAL);
2906 kdb_register_flags("summary", kdb_summary, "",
2907 "Summarize the system", 4,
2908 KDB_ENABLE_ALWAYS_SAFE);
2909 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2910 "Display per_cpu variables", 3,
2911 KDB_ENABLE_MEM_READ);
2912 kdb_register_flags("grephelp", kdb_grep_help, "",
2913 "Display help on | grep", 0,
2914 KDB_ENABLE_ALWAYS_SAFE);
2915}
2916
2917/* Execute any commands defined in kdb_cmds. */
2918static void __init kdb_cmd_init(void)
2919{
2920 int i, diag;
2921 for (i = 0; kdb_cmds[i]; ++i) {
2922 diag = kdb_parse(kdb_cmds[i]);
2923 if (diag)
2924 kdb_printf("kdb command %s failed, kdb diag %d\n",
2925 kdb_cmds[i], diag);
2926 }
2927 if (defcmd_in_progress) {
2928 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2929 kdb_parse("endefcmd");
2930 }
2931}
2932
2933/* Initialize kdb_printf, breakpoint tables and kdb state */
2934void __init kdb_init(int lvl)
2935{
2936 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2937 int i;
2938
2939 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2940 return;
2941 for (i = kdb_init_lvl; i < lvl; i++) {
2942 switch (i) {
2943 case KDB_NOT_INITIALIZED:
2944 kdb_inittab(); /* Initialize Command Table */
2945 kdb_initbptab(); /* Initialize Breakpoints */
2946 break;
2947 case KDB_INIT_EARLY:
2948 kdb_cmd_init(); /* Build kdb_cmds tables */
2949 break;
2950 }
2951 }
2952 kdb_init_lvl = lvl;
2953}