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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
158/*
159 * Update the permissions flags (kdb_cmd_enabled) to match the
160 * current lockdown state.
161 *
162 * Within this function the calls to security_locked_down() are "lazy". We
163 * avoid calling them if the current value of kdb_cmd_enabled already excludes
164 * flags that might be subject to lockdown. Additionally we deliberately check
165 * the lockdown flags independently (even though read lockdown implies write
166 * lockdown) since that results in both simpler code and clearer messages to
167 * the user on first-time debugger entry.
168 *
169 * The permission masks during a read+write lockdown permits the following
170 * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE).
171 *
172 * The INSPECT commands are not blocked during lockdown because they are
173 * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes
174 * forcing them to have no arguments) and lsmod. These commands do expose
175 * some kernel state but do not allow the developer seated at the console to
176 * choose what state is reported. SIGNAL and REBOOT should not be controversial,
177 * given these are allowed for root during lockdown already.
178 */
179static void kdb_check_for_lockdown(void)
180{
181 const int write_flags = KDB_ENABLE_MEM_WRITE |
182 KDB_ENABLE_REG_WRITE |
183 KDB_ENABLE_FLOW_CTRL;
184 const int read_flags = KDB_ENABLE_MEM_READ |
185 KDB_ENABLE_REG_READ;
186
187 bool need_to_lockdown_write = false;
188 bool need_to_lockdown_read = false;
189
190 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags))
191 need_to_lockdown_write =
192 security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL);
193
194 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags))
195 need_to_lockdown_read =
196 security_locked_down(LOCKDOWN_DBG_READ_KERNEL);
197
198 /* De-compose KDB_ENABLE_ALL if required */
199 if (need_to_lockdown_write || need_to_lockdown_read)
200 if (kdb_cmd_enabled & KDB_ENABLE_ALL)
201 kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL;
202
203 if (need_to_lockdown_write)
204 kdb_cmd_enabled &= ~write_flags;
205
206 if (need_to_lockdown_read)
207 kdb_cmd_enabled &= ~read_flags;
208}
209
210/*
211 * Check whether the flags of the current command, the permissions of the kdb
212 * console and the lockdown state allow a command to be run.
213 */
214static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
215 bool no_args)
216{
217 /* permissions comes from userspace so needs massaging slightly */
218 permissions &= KDB_ENABLE_MASK;
219 permissions |= KDB_ENABLE_ALWAYS_SAFE;
220
221 /* some commands change group when launched with no arguments */
222 if (no_args)
223 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
224
225 flags |= KDB_ENABLE_ALL;
226
227 return permissions & flags;
228}
229
230/*
231 * kdbgetenv - This function will return the character string value of
232 * an environment variable.
233 * Parameters:
234 * match A character string representing an environment variable.
235 * Returns:
236 * NULL No environment variable matches 'match'
237 * char* Pointer to string value of environment variable.
238 */
239char *kdbgetenv(const char *match)
240{
241 char **ep = __env;
242 int matchlen = strlen(match);
243 int i;
244
245 for (i = 0; i < __nenv; i++) {
246 char *e = *ep++;
247
248 if (!e)
249 continue;
250
251 if ((strncmp(match, e, matchlen) == 0)
252 && ((e[matchlen] == '\0')
253 || (e[matchlen] == '='))) {
254 char *cp = strchr(e, '=');
255 return cp ? ++cp : "";
256 }
257 }
258 return NULL;
259}
260
261/*
262 * kdballocenv - This function is used to allocate bytes for
263 * environment entries.
264 * Parameters:
265 * bytes The number of bytes to allocate in the static buffer.
266 * Returns:
267 * A pointer to the allocated space in the buffer on success.
268 * NULL if bytes > size available in the envbuffer.
269 * Remarks:
270 * We use a static environment buffer (envbuffer) to hold the values
271 * of dynamically generated environment variables (see kdb_set). Buffer
272 * space once allocated is never free'd, so over time, the amount of space
273 * (currently 512 bytes) will be exhausted if env variables are changed
274 * frequently.
275 */
276static char *kdballocenv(size_t bytes)
277{
278#define KDB_ENVBUFSIZE 512
279 static char envbuffer[KDB_ENVBUFSIZE];
280 static int envbufsize;
281 char *ep = NULL;
282
283 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
284 ep = &envbuffer[envbufsize];
285 envbufsize += bytes;
286 }
287 return ep;
288}
289
290/*
291 * kdbgetulenv - This function will return the value of an unsigned
292 * long-valued environment variable.
293 * Parameters:
294 * match A character string representing a numeric value
295 * Outputs:
296 * *value the unsigned long representation of the env variable 'match'
297 * Returns:
298 * Zero on success, a kdb diagnostic on failure.
299 */
300static int kdbgetulenv(const char *match, unsigned long *value)
301{
302 char *ep;
303
304 ep = kdbgetenv(match);
305 if (!ep)
306 return KDB_NOTENV;
307 if (strlen(ep) == 0)
308 return KDB_NOENVVALUE;
309 if (kstrtoul(ep, 0, value))
310 return KDB_BADINT;
311
312 return 0;
313}
314
315/*
316 * kdbgetintenv - This function will return the value of an
317 * integer-valued environment variable.
318 * Parameters:
319 * match A character string representing an integer-valued env variable
320 * Outputs:
321 * *value the integer representation of the environment variable 'match'
322 * Returns:
323 * Zero on success, a kdb diagnostic on failure.
324 */
325int kdbgetintenv(const char *match, int *value)
326{
327 unsigned long val;
328 int diag;
329
330 diag = kdbgetulenv(match, &val);
331 if (!diag)
332 *value = (int) val;
333 return diag;
334}
335
336/*
337 * kdb_setenv() - Alter an existing environment variable or create a new one.
338 * @var: Name of the variable
339 * @val: Value of the variable
340 *
341 * Return: Zero on success, a kdb diagnostic on failure.
342 */
343static int kdb_setenv(const char *var, const char *val)
344{
345 int i;
346 char *ep;
347 size_t varlen, vallen;
348
349 varlen = strlen(var);
350 vallen = strlen(val);
351 ep = kdballocenv(varlen + vallen + 2);
352 if (ep == (char *)0)
353 return KDB_ENVBUFFULL;
354
355 sprintf(ep, "%s=%s", var, val);
356
357 for (i = 0; i < __nenv; i++) {
358 if (__env[i]
359 && ((strncmp(__env[i], var, varlen) == 0)
360 && ((__env[i][varlen] == '\0')
361 || (__env[i][varlen] == '=')))) {
362 __env[i] = ep;
363 return 0;
364 }
365 }
366
367 /*
368 * Wasn't existing variable. Fit into slot.
369 */
370 for (i = 0; i < __nenv-1; i++) {
371 if (__env[i] == (char *)0) {
372 __env[i] = ep;
373 return 0;
374 }
375 }
376
377 return KDB_ENVFULL;
378}
379
380/*
381 * kdb_printenv() - Display the current environment variables.
382 */
383static void kdb_printenv(void)
384{
385 int i;
386
387 for (i = 0; i < __nenv; i++) {
388 if (__env[i])
389 kdb_printf("%s\n", __env[i]);
390 }
391}
392
393/*
394 * kdbgetularg - This function will convert a numeric string into an
395 * unsigned long value.
396 * Parameters:
397 * arg A character string representing a numeric value
398 * Outputs:
399 * *value the unsigned long representation of arg.
400 * Returns:
401 * Zero on success, a kdb diagnostic on failure.
402 */
403int kdbgetularg(const char *arg, unsigned long *value)
404{
405 if (kstrtoul(arg, 0, value))
406 return KDB_BADINT;
407 return 0;
408}
409
410int kdbgetu64arg(const char *arg, u64 *value)
411{
412 if (kstrtou64(arg, 0, value))
413 return KDB_BADINT;
414 return 0;
415}
416
417/*
418 * kdb_set - This function implements the 'set' command. Alter an
419 * existing environment variable or create a new one.
420 */
421int kdb_set(int argc, const char **argv)
422{
423 /*
424 * we can be invoked two ways:
425 * set var=value argv[1]="var", argv[2]="value"
426 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
427 * - if the latter, shift 'em down.
428 */
429 if (argc == 3) {
430 argv[2] = argv[3];
431 argc--;
432 }
433
434 if (argc != 2)
435 return KDB_ARGCOUNT;
436
437 /*
438 * Censor sensitive variables
439 */
440 if (strcmp(argv[1], "PROMPT") == 0 &&
441 !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
442 return KDB_NOPERM;
443
444 /*
445 * Check for internal variables
446 */
447 if (strcmp(argv[1], "KDBDEBUG") == 0) {
448 unsigned int debugflags;
449 int ret;
450
451 ret = kstrtouint(argv[2], 0, &debugflags);
452 if (ret || debugflags & ~KDB_DEBUG_FLAG_MASK) {
453 kdb_printf("kdb: illegal debug flags '%s'\n",
454 argv[2]);
455 return 0;
456 }
457 kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK))
458 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
459
460 return 0;
461 }
462
463 /*
464 * Tokenizer squashed the '=' sign. argv[1] is variable
465 * name, argv[2] = value.
466 */
467 return kdb_setenv(argv[1], argv[2]);
468}
469
470static int kdb_check_regs(void)
471{
472 if (!kdb_current_regs) {
473 kdb_printf("No current kdb registers."
474 " You may need to select another task\n");
475 return KDB_BADREG;
476 }
477 return 0;
478}
479
480/*
481 * kdbgetaddrarg - This function is responsible for parsing an
482 * address-expression and returning the value of the expression,
483 * symbol name, and offset to the caller.
484 *
485 * The argument may consist of a numeric value (decimal or
486 * hexadecimal), a symbol name, a register name (preceded by the
487 * percent sign), an environment variable with a numeric value
488 * (preceded by a dollar sign) or a simple arithmetic expression
489 * consisting of a symbol name, +/-, and a numeric constant value
490 * (offset).
491 * Parameters:
492 * argc - count of arguments in argv
493 * argv - argument vector
494 * *nextarg - index to next unparsed argument in argv[]
495 * regs - Register state at time of KDB entry
496 * Outputs:
497 * *value - receives the value of the address-expression
498 * *offset - receives the offset specified, if any
499 * *name - receives the symbol name, if any
500 * *nextarg - index to next unparsed argument in argv[]
501 * Returns:
502 * zero is returned on success, a kdb diagnostic code is
503 * returned on error.
504 */
505int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
506 unsigned long *value, long *offset,
507 char **name)
508{
509 unsigned long addr;
510 unsigned long off = 0;
511 int positive;
512 int diag;
513 int found = 0;
514 char *symname;
515 char symbol = '\0';
516 char *cp;
517 kdb_symtab_t symtab;
518
519 /*
520 * If the enable flags prohibit both arbitrary memory access
521 * and flow control then there are no reasonable grounds to
522 * provide symbol lookup.
523 */
524 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
525 kdb_cmd_enabled, false))
526 return KDB_NOPERM;
527
528 /*
529 * Process arguments which follow the following syntax:
530 *
531 * symbol | numeric-address [+/- numeric-offset]
532 * %register
533 * $environment-variable
534 */
535
536 if (*nextarg > argc)
537 return KDB_ARGCOUNT;
538
539 symname = (char *)argv[*nextarg];
540
541 /*
542 * If there is no whitespace between the symbol
543 * or address and the '+' or '-' symbols, we
544 * remember the character and replace it with a
545 * null so the symbol/value can be properly parsed
546 */
547 cp = strpbrk(symname, "+-");
548 if (cp != NULL) {
549 symbol = *cp;
550 *cp++ = '\0';
551 }
552
553 if (symname[0] == '$') {
554 diag = kdbgetulenv(&symname[1], &addr);
555 if (diag)
556 return diag;
557 } else if (symname[0] == '%') {
558 diag = kdb_check_regs();
559 if (diag)
560 return diag;
561 /* Implement register values with % at a later time as it is
562 * arch optional.
563 */
564 return KDB_NOTIMP;
565 } else {
566 found = kdbgetsymval(symname, &symtab);
567 if (found) {
568 addr = symtab.sym_start;
569 } else {
570 diag = kdbgetularg(argv[*nextarg], &addr);
571 if (diag)
572 return diag;
573 }
574 }
575
576 if (!found)
577 found = kdbnearsym(addr, &symtab);
578
579 (*nextarg)++;
580
581 if (name)
582 *name = symname;
583 if (value)
584 *value = addr;
585 if (offset && name && *name)
586 *offset = addr - symtab.sym_start;
587
588 if ((*nextarg > argc)
589 && (symbol == '\0'))
590 return 0;
591
592 /*
593 * check for +/- and offset
594 */
595
596 if (symbol == '\0') {
597 if ((argv[*nextarg][0] != '+')
598 && (argv[*nextarg][0] != '-')) {
599 /*
600 * Not our argument. Return.
601 */
602 return 0;
603 } else {
604 positive = (argv[*nextarg][0] == '+');
605 (*nextarg)++;
606 }
607 } else
608 positive = (symbol == '+');
609
610 /*
611 * Now there must be an offset!
612 */
613 if ((*nextarg > argc)
614 && (symbol == '\0')) {
615 return KDB_INVADDRFMT;
616 }
617
618 if (!symbol) {
619 cp = (char *)argv[*nextarg];
620 (*nextarg)++;
621 }
622
623 diag = kdbgetularg(cp, &off);
624 if (diag)
625 return diag;
626
627 if (!positive)
628 off = -off;
629
630 if (offset)
631 *offset += off;
632
633 if (value)
634 *value += off;
635
636 return 0;
637}
638
639static void kdb_cmderror(int diag)
640{
641 int i;
642
643 if (diag >= 0) {
644 kdb_printf("no error detected (diagnostic is %d)\n", diag);
645 return;
646 }
647
648 for (i = 0; i < __nkdb_err; i++) {
649 if (kdbmsgs[i].km_diag == diag) {
650 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
651 return;
652 }
653 }
654
655 kdb_printf("Unknown diag %d\n", -diag);
656}
657
658/*
659 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
660 * command which defines one command as a set of other commands,
661 * terminated by endefcmd. kdb_defcmd processes the initial
662 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
663 * the following commands until 'endefcmd'.
664 * Inputs:
665 * argc argument count
666 * argv argument vector
667 * Returns:
668 * zero for success, a kdb diagnostic if error
669 */
670struct kdb_macro {
671 kdbtab_t cmd; /* Macro command */
672 struct list_head statements; /* Associated statement list */
673};
674
675struct kdb_macro_statement {
676 char *statement; /* Statement text */
677 struct list_head list_node; /* Statement list node */
678};
679
680static struct kdb_macro *kdb_macro;
681static bool defcmd_in_progress;
682
683/* Forward references */
684static int kdb_exec_defcmd(int argc, const char **argv);
685
686static int kdb_defcmd2(const char *cmdstr, const char *argv0)
687{
688 struct kdb_macro_statement *kms;
689
690 if (!kdb_macro)
691 return KDB_NOTIMP;
692
693 if (strcmp(argv0, "endefcmd") == 0) {
694 defcmd_in_progress = false;
695 if (!list_empty(&kdb_macro->statements))
696 kdb_register(&kdb_macro->cmd);
697 return 0;
698 }
699
700 kms = kmalloc(sizeof(*kms), GFP_KDB);
701 if (!kms) {
702 kdb_printf("Could not allocate new kdb macro command: %s\n",
703 cmdstr);
704 return KDB_NOTIMP;
705 }
706
707 kms->statement = kdb_strdup(cmdstr, GFP_KDB);
708 list_add_tail(&kms->list_node, &kdb_macro->statements);
709
710 return 0;
711}
712
713static int kdb_defcmd(int argc, const char **argv)
714{
715 kdbtab_t *mp;
716
717 if (defcmd_in_progress) {
718 kdb_printf("kdb: nested defcmd detected, assuming missing "
719 "endefcmd\n");
720 kdb_defcmd2("endefcmd", "endefcmd");
721 }
722 if (argc == 0) {
723 kdbtab_t *kp;
724 struct kdb_macro *kmp;
725 struct kdb_macro_statement *kms;
726
727 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
728 if (kp->func == kdb_exec_defcmd) {
729 kdb_printf("defcmd %s \"%s\" \"%s\"\n",
730 kp->name, kp->usage, kp->help);
731 kmp = container_of(kp, struct kdb_macro, cmd);
732 list_for_each_entry(kms, &kmp->statements,
733 list_node)
734 kdb_printf("%s", kms->statement);
735 kdb_printf("endefcmd\n");
736 }
737 }
738 return 0;
739 }
740 if (argc != 3)
741 return KDB_ARGCOUNT;
742 if (in_dbg_master()) {
743 kdb_printf("Command only available during kdb_init()\n");
744 return KDB_NOTIMP;
745 }
746 kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
747 if (!kdb_macro)
748 goto fail_defcmd;
749
750 mp = &kdb_macro->cmd;
751 mp->func = kdb_exec_defcmd;
752 mp->minlen = 0;
753 mp->flags = KDB_ENABLE_ALWAYS_SAFE;
754 mp->name = kdb_strdup(argv[1], GFP_KDB);
755 if (!mp->name)
756 goto fail_name;
757 mp->usage = kdb_strdup(argv[2], GFP_KDB);
758 if (!mp->usage)
759 goto fail_usage;
760 mp->help = kdb_strdup(argv[3], GFP_KDB);
761 if (!mp->help)
762 goto fail_help;
763 if (mp->usage[0] == '"') {
764 strcpy(mp->usage, argv[2]+1);
765 mp->usage[strlen(mp->usage)-1] = '\0';
766 }
767 if (mp->help[0] == '"') {
768 strcpy(mp->help, argv[3]+1);
769 mp->help[strlen(mp->help)-1] = '\0';
770 }
771
772 INIT_LIST_HEAD(&kdb_macro->statements);
773 defcmd_in_progress = true;
774 return 0;
775fail_help:
776 kfree(mp->usage);
777fail_usage:
778 kfree(mp->name);
779fail_name:
780 kfree(kdb_macro);
781fail_defcmd:
782 kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
783 return KDB_NOTIMP;
784}
785
786/*
787 * kdb_exec_defcmd - Execute the set of commands associated with this
788 * defcmd name.
789 * Inputs:
790 * argc argument count
791 * argv argument vector
792 * Returns:
793 * zero for success, a kdb diagnostic if error
794 */
795static int kdb_exec_defcmd(int argc, const char **argv)
796{
797 int ret;
798 kdbtab_t *kp;
799 struct kdb_macro *kmp;
800 struct kdb_macro_statement *kms;
801
802 if (argc != 0)
803 return KDB_ARGCOUNT;
804
805 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
806 if (strcmp(kp->name, argv[0]) == 0)
807 break;
808 }
809 if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
810 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
811 argv[0]);
812 return KDB_NOTIMP;
813 }
814 kmp = container_of(kp, struct kdb_macro, cmd);
815 list_for_each_entry(kms, &kmp->statements, list_node) {
816 /*
817 * Recursive use of kdb_parse, do not use argv after this point.
818 */
819 argv = NULL;
820 kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
821 ret = kdb_parse(kms->statement);
822 if (ret)
823 return ret;
824 }
825 return 0;
826}
827
828/* Command history */
829#define KDB_CMD_HISTORY_COUNT 32
830#define CMD_BUFLEN 200 /* kdb_printf: max printline
831 * size == 256 */
832static unsigned int cmd_head, cmd_tail;
833static unsigned int cmdptr;
834static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
835static char cmd_cur[CMD_BUFLEN];
836
837/*
838 * The "str" argument may point to something like | grep xyz
839 */
840static void parse_grep(const char *str)
841{
842 int len;
843 char *cp = (char *)str, *cp2;
844
845 /* sanity check: we should have been called with the \ first */
846 if (*cp != '|')
847 return;
848 cp++;
849 while (isspace(*cp))
850 cp++;
851 if (!str_has_prefix(cp, "grep ")) {
852 kdb_printf("invalid 'pipe', see grephelp\n");
853 return;
854 }
855 cp += 5;
856 while (isspace(*cp))
857 cp++;
858 cp2 = strchr(cp, '\n');
859 if (cp2)
860 *cp2 = '\0'; /* remove the trailing newline */
861 len = strlen(cp);
862 if (len == 0) {
863 kdb_printf("invalid 'pipe', see grephelp\n");
864 return;
865 }
866 /* now cp points to a nonzero length search string */
867 if (*cp == '"') {
868 /* allow it be "x y z" by removing the "'s - there must
869 be two of them */
870 cp++;
871 cp2 = strchr(cp, '"');
872 if (!cp2) {
873 kdb_printf("invalid quoted string, see grephelp\n");
874 return;
875 }
876 *cp2 = '\0'; /* end the string where the 2nd " was */
877 }
878 kdb_grep_leading = 0;
879 if (*cp == '^') {
880 kdb_grep_leading = 1;
881 cp++;
882 }
883 len = strlen(cp);
884 kdb_grep_trailing = 0;
885 if (*(cp+len-1) == '$') {
886 kdb_grep_trailing = 1;
887 *(cp+len-1) = '\0';
888 }
889 len = strlen(cp);
890 if (!len)
891 return;
892 if (len >= KDB_GREP_STRLEN) {
893 kdb_printf("search string too long\n");
894 return;
895 }
896 strcpy(kdb_grep_string, cp);
897 kdb_grepping_flag++;
898 return;
899}
900
901/*
902 * kdb_parse - Parse the command line, search the command table for a
903 * matching command and invoke the command function. This
904 * function may be called recursively, if it is, the second call
905 * will overwrite argv and cbuf. It is the caller's
906 * responsibility to save their argv if they recursively call
907 * kdb_parse().
908 * Parameters:
909 * cmdstr The input command line to be parsed.
910 * regs The registers at the time kdb was entered.
911 * Returns:
912 * Zero for success, a kdb diagnostic if failure.
913 * Remarks:
914 * Limited to 20 tokens.
915 *
916 * Real rudimentary tokenization. Basically only whitespace
917 * is considered a token delimiter (but special consideration
918 * is taken of the '=' sign as used by the 'set' command).
919 *
920 * The algorithm used to tokenize the input string relies on
921 * there being at least one whitespace (or otherwise useless)
922 * character between tokens as the character immediately following
923 * the token is altered in-place to a null-byte to terminate the
924 * token string.
925 */
926
927#define MAXARGC 20
928
929int kdb_parse(const char *cmdstr)
930{
931 static char *argv[MAXARGC];
932 static int argc;
933 static char cbuf[CMD_BUFLEN+2];
934 char *cp;
935 char *cpp, quoted;
936 kdbtab_t *tp;
937 int escaped, ignore_errors = 0, check_grep = 0;
938
939 /*
940 * First tokenize the command string.
941 */
942 cp = (char *)cmdstr;
943
944 if (KDB_FLAG(CMD_INTERRUPT)) {
945 /* Previous command was interrupted, newline must not
946 * repeat the command */
947 KDB_FLAG_CLEAR(CMD_INTERRUPT);
948 KDB_STATE_SET(PAGER);
949 argc = 0; /* no repeat */
950 }
951
952 if (*cp != '\n' && *cp != '\0') {
953 argc = 0;
954 cpp = cbuf;
955 while (*cp) {
956 /* skip whitespace */
957 while (isspace(*cp))
958 cp++;
959 if ((*cp == '\0') || (*cp == '\n') ||
960 (*cp == '#' && !defcmd_in_progress))
961 break;
962 /* special case: check for | grep pattern */
963 if (*cp == '|') {
964 check_grep++;
965 break;
966 }
967 if (cpp >= cbuf + CMD_BUFLEN) {
968 kdb_printf("kdb_parse: command buffer "
969 "overflow, command ignored\n%s\n",
970 cmdstr);
971 return KDB_NOTFOUND;
972 }
973 if (argc >= MAXARGC - 1) {
974 kdb_printf("kdb_parse: too many arguments, "
975 "command ignored\n%s\n", cmdstr);
976 return KDB_NOTFOUND;
977 }
978 argv[argc++] = cpp;
979 escaped = 0;
980 quoted = '\0';
981 /* Copy to next unquoted and unescaped
982 * whitespace or '=' */
983 while (*cp && *cp != '\n' &&
984 (escaped || quoted || !isspace(*cp))) {
985 if (cpp >= cbuf + CMD_BUFLEN)
986 break;
987 if (escaped) {
988 escaped = 0;
989 *cpp++ = *cp++;
990 continue;
991 }
992 if (*cp == '\\') {
993 escaped = 1;
994 ++cp;
995 continue;
996 }
997 if (*cp == quoted)
998 quoted = '\0';
999 else if (*cp == '\'' || *cp == '"')
1000 quoted = *cp;
1001 *cpp = *cp++;
1002 if (*cpp == '=' && !quoted)
1003 break;
1004 ++cpp;
1005 }
1006 *cpp++ = '\0'; /* Squash a ws or '=' character */
1007 }
1008 }
1009 if (!argc)
1010 return 0;
1011 if (check_grep)
1012 parse_grep(cp);
1013 if (defcmd_in_progress) {
1014 int result = kdb_defcmd2(cmdstr, argv[0]);
1015 if (!defcmd_in_progress) {
1016 argc = 0; /* avoid repeat on endefcmd */
1017 *(argv[0]) = '\0';
1018 }
1019 return result;
1020 }
1021 if (argv[0][0] == '-' && argv[0][1] &&
1022 (argv[0][1] < '0' || argv[0][1] > '9')) {
1023 ignore_errors = 1;
1024 ++argv[0];
1025 }
1026
1027 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1028 /*
1029 * If this command is allowed to be abbreviated,
1030 * check to see if this is it.
1031 */
1032 if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
1033 (strncmp(argv[0], tp->name, tp->minlen) == 0))
1034 break;
1035
1036 if (strcmp(argv[0], tp->name) == 0)
1037 break;
1038 }
1039
1040 /*
1041 * If we don't find a command by this name, see if the first
1042 * few characters of this match any of the known commands.
1043 * e.g., md1c20 should match md.
1044 */
1045 if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1046 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1047 if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
1048 break;
1049 }
1050 }
1051
1052 if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1053 int result;
1054
1055 if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
1056 return KDB_NOPERM;
1057
1058 KDB_STATE_SET(CMD);
1059 result = (*tp->func)(argc-1, (const char **)argv);
1060 if (result && ignore_errors && result > KDB_CMD_GO)
1061 result = 0;
1062 KDB_STATE_CLEAR(CMD);
1063
1064 if (tp->flags & KDB_REPEAT_WITH_ARGS)
1065 return result;
1066
1067 argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1068 if (argv[argc])
1069 *(argv[argc]) = '\0';
1070 return result;
1071 }
1072
1073 /*
1074 * If the input with which we were presented does not
1075 * map to an existing command, attempt to parse it as an
1076 * address argument and display the result. Useful for
1077 * obtaining the address of a variable, or the nearest symbol
1078 * to an address contained in a register.
1079 */
1080 {
1081 unsigned long value;
1082 char *name = NULL;
1083 long offset;
1084 int nextarg = 0;
1085
1086 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1087 &value, &offset, &name)) {
1088 return KDB_NOTFOUND;
1089 }
1090
1091 kdb_printf("%s = ", argv[0]);
1092 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1093 kdb_printf("\n");
1094 return 0;
1095 }
1096}
1097
1098
1099static int handle_ctrl_cmd(char *cmd)
1100{
1101#define CTRL_P 16
1102#define CTRL_N 14
1103
1104 /* initial situation */
1105 if (cmd_head == cmd_tail)
1106 return 0;
1107 switch (*cmd) {
1108 case CTRL_P:
1109 if (cmdptr != cmd_tail)
1110 cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
1111 KDB_CMD_HISTORY_COUNT;
1112 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1113 return 1;
1114 case CTRL_N:
1115 if (cmdptr != cmd_head)
1116 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1117 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1118 return 1;
1119 }
1120 return 0;
1121}
1122
1123/*
1124 * kdb_reboot - This function implements the 'reboot' command. Reboot
1125 * the system immediately, or loop for ever on failure.
1126 */
1127static int kdb_reboot(int argc, const char **argv)
1128{
1129 emergency_restart();
1130 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1131 while (1)
1132 cpu_relax();
1133 /* NOTREACHED */
1134 return 0;
1135}
1136
1137static void kdb_dumpregs(struct pt_regs *regs)
1138{
1139 int old_lvl = console_loglevel;
1140 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1141 kdb_trap_printk++;
1142 show_regs(regs);
1143 kdb_trap_printk--;
1144 kdb_printf("\n");
1145 console_loglevel = old_lvl;
1146}
1147
1148static void kdb_set_current_task(struct task_struct *p)
1149{
1150 kdb_current_task = p;
1151
1152 if (kdb_task_has_cpu(p)) {
1153 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1154 return;
1155 }
1156 kdb_current_regs = NULL;
1157}
1158
1159static void drop_newline(char *buf)
1160{
1161 size_t len = strlen(buf);
1162
1163 if (len == 0)
1164 return;
1165 if (*(buf + len - 1) == '\n')
1166 *(buf + len - 1) = '\0';
1167}
1168
1169/*
1170 * kdb_local - The main code for kdb. This routine is invoked on a
1171 * specific processor, it is not global. The main kdb() routine
1172 * ensures that only one processor at a time is in this routine.
1173 * This code is called with the real reason code on the first
1174 * entry to a kdb session, thereafter it is called with reason
1175 * SWITCH, even if the user goes back to the original cpu.
1176 * Inputs:
1177 * reason The reason KDB was invoked
1178 * error The hardware-defined error code
1179 * regs The exception frame at time of fault/breakpoint.
1180 * db_result Result code from the break or debug point.
1181 * Returns:
1182 * 0 KDB was invoked for an event which it wasn't responsible
1183 * 1 KDB handled the event for which it was invoked.
1184 * KDB_CMD_GO User typed 'go'.
1185 * KDB_CMD_CPU User switched to another cpu.
1186 * KDB_CMD_SS Single step.
1187 */
1188static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1189 kdb_dbtrap_t db_result)
1190{
1191 char *cmdbuf;
1192 int diag;
1193 struct task_struct *kdb_current =
1194 curr_task(raw_smp_processor_id());
1195
1196 KDB_DEBUG_STATE("kdb_local 1", reason);
1197
1198 kdb_check_for_lockdown();
1199
1200 kdb_go_count = 0;
1201 if (reason == KDB_REASON_DEBUG) {
1202 /* special case below */
1203 } else {
1204 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1205 kdb_current, kdb_current ? kdb_current->pid : 0);
1206#if defined(CONFIG_SMP)
1207 kdb_printf("on processor %d ", raw_smp_processor_id());
1208#endif
1209 }
1210
1211 switch (reason) {
1212 case KDB_REASON_DEBUG:
1213 {
1214 /*
1215 * If re-entering kdb after a single step
1216 * command, don't print the message.
1217 */
1218 switch (db_result) {
1219 case KDB_DB_BPT:
1220 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1221 kdb_current, kdb_current->pid);
1222#if defined(CONFIG_SMP)
1223 kdb_printf("on processor %d ", raw_smp_processor_id());
1224#endif
1225 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1226 instruction_pointer(regs));
1227 break;
1228 case KDB_DB_SS:
1229 break;
1230 case KDB_DB_SSBPT:
1231 KDB_DEBUG_STATE("kdb_local 4", reason);
1232 return 1; /* kdba_db_trap did the work */
1233 default:
1234 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1235 db_result);
1236 break;
1237 }
1238
1239 }
1240 break;
1241 case KDB_REASON_ENTER:
1242 if (KDB_STATE(KEYBOARD))
1243 kdb_printf("due to Keyboard Entry\n");
1244 else
1245 kdb_printf("due to KDB_ENTER()\n");
1246 break;
1247 case KDB_REASON_KEYBOARD:
1248 KDB_STATE_SET(KEYBOARD);
1249 kdb_printf("due to Keyboard Entry\n");
1250 break;
1251 case KDB_REASON_ENTER_SLAVE:
1252 /* drop through, slaves only get released via cpu switch */
1253 case KDB_REASON_SWITCH:
1254 kdb_printf("due to cpu switch\n");
1255 break;
1256 case KDB_REASON_OOPS:
1257 kdb_printf("Oops: %s\n", kdb_diemsg);
1258 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1259 instruction_pointer(regs));
1260 kdb_dumpregs(regs);
1261 break;
1262 case KDB_REASON_SYSTEM_NMI:
1263 kdb_printf("due to System NonMaskable Interrupt\n");
1264 break;
1265 case KDB_REASON_NMI:
1266 kdb_printf("due to NonMaskable Interrupt @ "
1267 kdb_machreg_fmt "\n",
1268 instruction_pointer(regs));
1269 break;
1270 case KDB_REASON_SSTEP:
1271 case KDB_REASON_BREAK:
1272 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1273 reason == KDB_REASON_BREAK ?
1274 "Breakpoint" : "SS trap", instruction_pointer(regs));
1275 /*
1276 * Determine if this breakpoint is one that we
1277 * are interested in.
1278 */
1279 if (db_result != KDB_DB_BPT) {
1280 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1281 db_result);
1282 KDB_DEBUG_STATE("kdb_local 6", reason);
1283 return 0; /* Not for us, dismiss it */
1284 }
1285 break;
1286 case KDB_REASON_RECURSE:
1287 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1288 instruction_pointer(regs));
1289 break;
1290 default:
1291 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1292 KDB_DEBUG_STATE("kdb_local 8", reason);
1293 return 0; /* Not for us, dismiss it */
1294 }
1295
1296 while (1) {
1297 /*
1298 * Initialize pager context.
1299 */
1300 kdb_nextline = 1;
1301 KDB_STATE_CLEAR(SUPPRESS);
1302 kdb_grepping_flag = 0;
1303 /* ensure the old search does not leak into '/' commands */
1304 kdb_grep_string[0] = '\0';
1305
1306 cmdbuf = cmd_cur;
1307 *cmdbuf = '\0';
1308 *(cmd_hist[cmd_head]) = '\0';
1309
1310do_full_getstr:
1311 /* PROMPT can only be set if we have MEM_READ permission. */
1312 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1313 raw_smp_processor_id());
1314
1315 /*
1316 * Fetch command from keyboard
1317 */
1318 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1319 if (*cmdbuf != '\n') {
1320 if (*cmdbuf < 32) {
1321 if (cmdptr == cmd_head) {
1322 strscpy(cmd_hist[cmd_head], cmd_cur,
1323 CMD_BUFLEN);
1324 *(cmd_hist[cmd_head] +
1325 strlen(cmd_hist[cmd_head])-1) = '\0';
1326 }
1327 if (!handle_ctrl_cmd(cmdbuf))
1328 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1329 cmdbuf = cmd_cur;
1330 goto do_full_getstr;
1331 } else {
1332 strscpy(cmd_hist[cmd_head], cmd_cur,
1333 CMD_BUFLEN);
1334 }
1335
1336 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1337 if (cmd_head == cmd_tail)
1338 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1339 }
1340
1341 cmdptr = cmd_head;
1342 diag = kdb_parse(cmdbuf);
1343 if (diag == KDB_NOTFOUND) {
1344 drop_newline(cmdbuf);
1345 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1346 diag = 0;
1347 }
1348 if (diag == KDB_CMD_GO
1349 || diag == KDB_CMD_CPU
1350 || diag == KDB_CMD_SS
1351 || diag == KDB_CMD_KGDB)
1352 break;
1353
1354 if (diag)
1355 kdb_cmderror(diag);
1356 }
1357 KDB_DEBUG_STATE("kdb_local 9", diag);
1358 return diag;
1359}
1360
1361
1362/*
1363 * kdb_print_state - Print the state data for the current processor
1364 * for debugging.
1365 * Inputs:
1366 * text Identifies the debug point
1367 * value Any integer value to be printed, e.g. reason code.
1368 */
1369void kdb_print_state(const char *text, int value)
1370{
1371 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1372 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1373 kdb_state);
1374}
1375
1376/*
1377 * kdb_main_loop - After initial setup and assignment of the
1378 * controlling cpu, all cpus are in this loop. One cpu is in
1379 * control and will issue the kdb prompt, the others will spin
1380 * until 'go' or cpu switch.
1381 *
1382 * To get a consistent view of the kernel stacks for all
1383 * processes, this routine is invoked from the main kdb code via
1384 * an architecture specific routine. kdba_main_loop is
1385 * responsible for making the kernel stacks consistent for all
1386 * processes, there should be no difference between a blocked
1387 * process and a running process as far as kdb is concerned.
1388 * Inputs:
1389 * reason The reason KDB was invoked
1390 * error The hardware-defined error code
1391 * reason2 kdb's current reason code.
1392 * Initially error but can change
1393 * according to kdb state.
1394 * db_result Result code from break or debug point.
1395 * regs The exception frame at time of fault/breakpoint.
1396 * should always be valid.
1397 * Returns:
1398 * 0 KDB was invoked for an event which it wasn't responsible
1399 * 1 KDB handled the event for which it was invoked.
1400 */
1401int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1402 kdb_dbtrap_t db_result, struct pt_regs *regs)
1403{
1404 int result = 1;
1405 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1406 while (1) {
1407 /*
1408 * All processors except the one that is in control
1409 * will spin here.
1410 */
1411 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1412 while (KDB_STATE(HOLD_CPU)) {
1413 /* state KDB is turned off by kdb_cpu to see if the
1414 * other cpus are still live, each cpu in this loop
1415 * turns it back on.
1416 */
1417 if (!KDB_STATE(KDB))
1418 KDB_STATE_SET(KDB);
1419 }
1420
1421 KDB_STATE_CLEAR(SUPPRESS);
1422 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1423 if (KDB_STATE(LEAVING))
1424 break; /* Another cpu said 'go' */
1425 /* Still using kdb, this processor is in control */
1426 result = kdb_local(reason2, error, regs, db_result);
1427 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1428
1429 if (result == KDB_CMD_CPU)
1430 break;
1431
1432 if (result == KDB_CMD_SS) {
1433 KDB_STATE_SET(DOING_SS);
1434 break;
1435 }
1436
1437 if (result == KDB_CMD_KGDB) {
1438 if (!KDB_STATE(DOING_KGDB))
1439 kdb_printf("Entering please attach debugger "
1440 "or use $D#44+ or $3#33\n");
1441 break;
1442 }
1443 if (result && result != 1 && result != KDB_CMD_GO)
1444 kdb_printf("\nUnexpected kdb_local return code %d\n",
1445 result);
1446 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1447 break;
1448 }
1449 if (KDB_STATE(DOING_SS))
1450 KDB_STATE_CLEAR(SSBPT);
1451
1452 /* Clean up any keyboard devices before leaving */
1453 kdb_kbd_cleanup_state();
1454
1455 return result;
1456}
1457
1458/*
1459 * kdb_mdr - This function implements the guts of the 'mdr', memory
1460 * read command.
1461 * mdr <addr arg>,<byte count>
1462 * Inputs:
1463 * addr Start address
1464 * count Number of bytes
1465 * Returns:
1466 * Always 0. Any errors are detected and printed by kdb_getarea.
1467 */
1468static int kdb_mdr(unsigned long addr, unsigned int count)
1469{
1470 unsigned char c;
1471 while (count--) {
1472 if (kdb_getarea(c, addr))
1473 return 0;
1474 kdb_printf("%02x", c);
1475 addr++;
1476 }
1477 kdb_printf("\n");
1478 return 0;
1479}
1480
1481/*
1482 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1483 * 'md8' 'mdr' and 'mds' commands.
1484 *
1485 * md|mds [<addr arg> [<line count> [<radix>]]]
1486 * mdWcN [<addr arg> [<line count> [<radix>]]]
1487 * where W = is the width (1, 2, 4 or 8) and N is the count.
1488 * for eg., md1c20 reads 20 bytes, 1 at a time.
1489 * mdr <addr arg>,<byte count>
1490 */
1491static void kdb_md_line(const char *fmtstr, unsigned long addr,
1492 int symbolic, int nosect, int bytesperword,
1493 int num, int repeat, int phys)
1494{
1495 /* print just one line of data */
1496 kdb_symtab_t symtab;
1497 char cbuf[32];
1498 char *c = cbuf;
1499 int i;
1500 int j;
1501 unsigned long word;
1502
1503 memset(cbuf, '\0', sizeof(cbuf));
1504 if (phys)
1505 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1506 else
1507 kdb_printf(kdb_machreg_fmt0 " ", addr);
1508
1509 for (i = 0; i < num && repeat--; i++) {
1510 if (phys) {
1511 if (kdb_getphysword(&word, addr, bytesperword))
1512 break;
1513 } else if (kdb_getword(&word, addr, bytesperword))
1514 break;
1515 kdb_printf(fmtstr, word);
1516 if (symbolic)
1517 kdbnearsym(word, &symtab);
1518 else
1519 memset(&symtab, 0, sizeof(symtab));
1520 if (symtab.sym_name) {
1521 kdb_symbol_print(word, &symtab, 0);
1522 if (!nosect) {
1523 kdb_printf("\n");
1524 kdb_printf(" %s %s "
1525 kdb_machreg_fmt " "
1526 kdb_machreg_fmt " "
1527 kdb_machreg_fmt, symtab.mod_name,
1528 symtab.sec_name, symtab.sec_start,
1529 symtab.sym_start, symtab.sym_end);
1530 }
1531 addr += bytesperword;
1532 } else {
1533 union {
1534 u64 word;
1535 unsigned char c[8];
1536 } wc;
1537 unsigned char *cp;
1538#ifdef __BIG_ENDIAN
1539 cp = wc.c + 8 - bytesperword;
1540#else
1541 cp = wc.c;
1542#endif
1543 wc.word = word;
1544#define printable_char(c) \
1545 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1546 for (j = 0; j < bytesperword; j++)
1547 *c++ = printable_char(*cp++);
1548 addr += bytesperword;
1549#undef printable_char
1550 }
1551 }
1552 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1553 " ", cbuf);
1554}
1555
1556static int kdb_md(int argc, const char **argv)
1557{
1558 static unsigned long last_addr;
1559 static int last_radix, last_bytesperword, last_repeat;
1560 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1561 int nosect = 0;
1562 char fmtchar, fmtstr[64];
1563 unsigned long addr;
1564 unsigned long word;
1565 long offset = 0;
1566 int symbolic = 0;
1567 int valid = 0;
1568 int phys = 0;
1569 int raw = 0;
1570
1571 kdbgetintenv("MDCOUNT", &mdcount);
1572 kdbgetintenv("RADIX", &radix);
1573 kdbgetintenv("BYTESPERWORD", &bytesperword);
1574
1575 /* Assume 'md <addr>' and start with environment values */
1576 repeat = mdcount * 16 / bytesperword;
1577
1578 if (strcmp(argv[0], "mdr") == 0) {
1579 if (argc == 2 || (argc == 0 && last_addr != 0))
1580 valid = raw = 1;
1581 else
1582 return KDB_ARGCOUNT;
1583 } else if (isdigit(argv[0][2])) {
1584 bytesperword = (int)(argv[0][2] - '0');
1585 if (bytesperword == 0) {
1586 bytesperword = last_bytesperword;
1587 if (bytesperword == 0)
1588 bytesperword = 4;
1589 }
1590 last_bytesperword = bytesperword;
1591 repeat = mdcount * 16 / bytesperword;
1592 if (!argv[0][3])
1593 valid = 1;
1594 else if (argv[0][3] == 'c' && argv[0][4]) {
1595 if (kstrtouint(argv[0] + 4, 10, &repeat))
1596 return KDB_BADINT;
1597 mdcount = ((repeat * bytesperword) + 15) / 16;
1598 valid = 1;
1599 }
1600 last_repeat = repeat;
1601 } else if (strcmp(argv[0], "md") == 0)
1602 valid = 1;
1603 else if (strcmp(argv[0], "mds") == 0)
1604 valid = 1;
1605 else if (strcmp(argv[0], "mdp") == 0) {
1606 phys = valid = 1;
1607 }
1608 if (!valid)
1609 return KDB_NOTFOUND;
1610
1611 if (argc == 0) {
1612 if (last_addr == 0)
1613 return KDB_ARGCOUNT;
1614 addr = last_addr;
1615 radix = last_radix;
1616 bytesperword = last_bytesperword;
1617 repeat = last_repeat;
1618 if (raw)
1619 mdcount = repeat;
1620 else
1621 mdcount = ((repeat * bytesperword) + 15) / 16;
1622 }
1623
1624 if (argc) {
1625 unsigned long val;
1626 int diag, nextarg = 1;
1627 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1628 &offset, NULL);
1629 if (diag)
1630 return diag;
1631 if (argc > nextarg+2)
1632 return KDB_ARGCOUNT;
1633
1634 if (argc >= nextarg) {
1635 diag = kdbgetularg(argv[nextarg], &val);
1636 if (!diag) {
1637 mdcount = (int) val;
1638 if (raw)
1639 repeat = mdcount;
1640 else
1641 repeat = mdcount * 16 / bytesperword;
1642 }
1643 }
1644 if (argc >= nextarg+1) {
1645 diag = kdbgetularg(argv[nextarg+1], &val);
1646 if (!diag)
1647 radix = (int) val;
1648 }
1649 }
1650
1651 if (strcmp(argv[0], "mdr") == 0) {
1652 int ret;
1653 last_addr = addr;
1654 ret = kdb_mdr(addr, mdcount);
1655 last_addr += mdcount;
1656 last_repeat = mdcount;
1657 last_bytesperword = bytesperword; // to make REPEAT happy
1658 return ret;
1659 }
1660
1661 switch (radix) {
1662 case 10:
1663 fmtchar = 'd';
1664 break;
1665 case 16:
1666 fmtchar = 'x';
1667 break;
1668 case 8:
1669 fmtchar = 'o';
1670 break;
1671 default:
1672 return KDB_BADRADIX;
1673 }
1674
1675 last_radix = radix;
1676
1677 if (bytesperword > KDB_WORD_SIZE)
1678 return KDB_BADWIDTH;
1679
1680 switch (bytesperword) {
1681 case 8:
1682 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1683 break;
1684 case 4:
1685 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1686 break;
1687 case 2:
1688 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1689 break;
1690 case 1:
1691 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1692 break;
1693 default:
1694 return KDB_BADWIDTH;
1695 }
1696
1697 last_repeat = repeat;
1698 last_bytesperword = bytesperword;
1699
1700 if (strcmp(argv[0], "mds") == 0) {
1701 symbolic = 1;
1702 /* Do not save these changes as last_*, they are temporary mds
1703 * overrides.
1704 */
1705 bytesperword = KDB_WORD_SIZE;
1706 repeat = mdcount;
1707 kdbgetintenv("NOSECT", &nosect);
1708 }
1709
1710 /* Round address down modulo BYTESPERWORD */
1711
1712 addr &= ~(bytesperword-1);
1713
1714 while (repeat > 0) {
1715 unsigned long a;
1716 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1717
1718 if (KDB_FLAG(CMD_INTERRUPT))
1719 return 0;
1720 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1721 if (phys) {
1722 if (kdb_getphysword(&word, a, bytesperword)
1723 || word)
1724 break;
1725 } else if (kdb_getword(&word, a, bytesperword) || word)
1726 break;
1727 }
1728 n = min(num, repeat);
1729 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1730 num, repeat, phys);
1731 addr += bytesperword * n;
1732 repeat -= n;
1733 z = (z + num - 1) / num;
1734 if (z > 2) {
1735 int s = num * (z-2);
1736 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1737 " zero suppressed\n",
1738 addr, addr + bytesperword * s - 1);
1739 addr += bytesperword * s;
1740 repeat -= s;
1741 }
1742 }
1743 last_addr = addr;
1744
1745 return 0;
1746}
1747
1748/*
1749 * kdb_mm - This function implements the 'mm' command.
1750 * mm address-expression new-value
1751 * Remarks:
1752 * mm works on machine words, mmW works on bytes.
1753 */
1754static int kdb_mm(int argc, const char **argv)
1755{
1756 int diag;
1757 unsigned long addr;
1758 long offset = 0;
1759 unsigned long contents;
1760 int nextarg;
1761 int width;
1762
1763 if (argv[0][2] && !isdigit(argv[0][2]))
1764 return KDB_NOTFOUND;
1765
1766 if (argc < 2)
1767 return KDB_ARGCOUNT;
1768
1769 nextarg = 1;
1770 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1771 if (diag)
1772 return diag;
1773
1774 if (nextarg > argc)
1775 return KDB_ARGCOUNT;
1776 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1777 if (diag)
1778 return diag;
1779
1780 if (nextarg != argc + 1)
1781 return KDB_ARGCOUNT;
1782
1783 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1784 diag = kdb_putword(addr, contents, width);
1785 if (diag)
1786 return diag;
1787
1788 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1789
1790 return 0;
1791}
1792
1793/*
1794 * kdb_go - This function implements the 'go' command.
1795 * go [address-expression]
1796 */
1797static int kdb_go(int argc, const char **argv)
1798{
1799 unsigned long addr;
1800 int diag;
1801 int nextarg;
1802 long offset;
1803
1804 if (raw_smp_processor_id() != kdb_initial_cpu) {
1805 kdb_printf("go must execute on the entry cpu, "
1806 "please use \"cpu %d\" and then execute go\n",
1807 kdb_initial_cpu);
1808 return KDB_BADCPUNUM;
1809 }
1810 if (argc == 1) {
1811 nextarg = 1;
1812 diag = kdbgetaddrarg(argc, argv, &nextarg,
1813 &addr, &offset, NULL);
1814 if (diag)
1815 return diag;
1816 } else if (argc) {
1817 return KDB_ARGCOUNT;
1818 }
1819
1820 diag = KDB_CMD_GO;
1821 if (KDB_FLAG(CATASTROPHIC)) {
1822 kdb_printf("Catastrophic error detected\n");
1823 kdb_printf("kdb_continue_catastrophic=%d, ",
1824 kdb_continue_catastrophic);
1825 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1826 kdb_printf("type go a second time if you really want "
1827 "to continue\n");
1828 return 0;
1829 }
1830 if (kdb_continue_catastrophic == 2) {
1831 kdb_printf("forcing reboot\n");
1832 kdb_reboot(0, NULL);
1833 }
1834 kdb_printf("attempting to continue\n");
1835 }
1836 return diag;
1837}
1838
1839/*
1840 * kdb_rd - This function implements the 'rd' command.
1841 */
1842static int kdb_rd(int argc, const char **argv)
1843{
1844 int len = kdb_check_regs();
1845#if DBG_MAX_REG_NUM > 0
1846 int i;
1847 char *rname;
1848 int rsize;
1849 u64 reg64;
1850 u32 reg32;
1851 u16 reg16;
1852 u8 reg8;
1853
1854 if (len)
1855 return len;
1856
1857 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1858 rsize = dbg_reg_def[i].size * 2;
1859 if (rsize > 16)
1860 rsize = 2;
1861 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1862 len = 0;
1863 kdb_printf("\n");
1864 }
1865 if (len)
1866 len += kdb_printf(" ");
1867 switch(dbg_reg_def[i].size * 8) {
1868 case 8:
1869 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1870 if (!rname)
1871 break;
1872 len += kdb_printf("%s: %02x", rname, reg8);
1873 break;
1874 case 16:
1875 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1876 if (!rname)
1877 break;
1878 len += kdb_printf("%s: %04x", rname, reg16);
1879 break;
1880 case 32:
1881 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1882 if (!rname)
1883 break;
1884 len += kdb_printf("%s: %08x", rname, reg32);
1885 break;
1886 case 64:
1887 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1888 if (!rname)
1889 break;
1890 len += kdb_printf("%s: %016llx", rname, reg64);
1891 break;
1892 default:
1893 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1894 }
1895 }
1896 kdb_printf("\n");
1897#else
1898 if (len)
1899 return len;
1900
1901 kdb_dumpregs(kdb_current_regs);
1902#endif
1903 return 0;
1904}
1905
1906/*
1907 * kdb_rm - This function implements the 'rm' (register modify) command.
1908 * rm register-name new-contents
1909 * Remarks:
1910 * Allows register modification with the same restrictions as gdb
1911 */
1912static int kdb_rm(int argc, const char **argv)
1913{
1914#if DBG_MAX_REG_NUM > 0
1915 int diag;
1916 const char *rname;
1917 int i;
1918 u64 reg64;
1919 u32 reg32;
1920 u16 reg16;
1921 u8 reg8;
1922
1923 if (argc != 2)
1924 return KDB_ARGCOUNT;
1925 /*
1926 * Allow presence or absence of leading '%' symbol.
1927 */
1928 rname = argv[1];
1929 if (*rname == '%')
1930 rname++;
1931
1932 diag = kdbgetu64arg(argv[2], ®64);
1933 if (diag)
1934 return diag;
1935
1936 diag = kdb_check_regs();
1937 if (diag)
1938 return diag;
1939
1940 diag = KDB_BADREG;
1941 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1942 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1943 diag = 0;
1944 break;
1945 }
1946 }
1947 if (!diag) {
1948 switch(dbg_reg_def[i].size * 8) {
1949 case 8:
1950 reg8 = reg64;
1951 dbg_set_reg(i, ®8, kdb_current_regs);
1952 break;
1953 case 16:
1954 reg16 = reg64;
1955 dbg_set_reg(i, ®16, kdb_current_regs);
1956 break;
1957 case 32:
1958 reg32 = reg64;
1959 dbg_set_reg(i, ®32, kdb_current_regs);
1960 break;
1961 case 64:
1962 dbg_set_reg(i, ®64, kdb_current_regs);
1963 break;
1964 }
1965 }
1966 return diag;
1967#else
1968 kdb_printf("ERROR: Register set currently not implemented\n");
1969 return 0;
1970#endif
1971}
1972
1973#if defined(CONFIG_MAGIC_SYSRQ)
1974/*
1975 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1976 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1977 * sr <magic-sysrq-code>
1978 */
1979static int kdb_sr(int argc, const char **argv)
1980{
1981 bool check_mask =
1982 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1983
1984 if (argc != 1)
1985 return KDB_ARGCOUNT;
1986
1987 kdb_trap_printk++;
1988 __handle_sysrq(*argv[1], check_mask);
1989 kdb_trap_printk--;
1990
1991 return 0;
1992}
1993#endif /* CONFIG_MAGIC_SYSRQ */
1994
1995/*
1996 * kdb_ef - This function implements the 'regs' (display exception
1997 * frame) command. This command takes an address and expects to
1998 * find an exception frame at that address, formats and prints
1999 * it.
2000 * regs address-expression
2001 * Remarks:
2002 * Not done yet.
2003 */
2004static int kdb_ef(int argc, const char **argv)
2005{
2006 int diag;
2007 unsigned long addr;
2008 long offset;
2009 int nextarg;
2010
2011 if (argc != 1)
2012 return KDB_ARGCOUNT;
2013
2014 nextarg = 1;
2015 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2016 if (diag)
2017 return diag;
2018 show_regs((struct pt_regs *)addr);
2019 return 0;
2020}
2021
2022/*
2023 * kdb_env - This function implements the 'env' command. Display the
2024 * current environment variables.
2025 */
2026
2027static int kdb_env(int argc, const char **argv)
2028{
2029 kdb_printenv();
2030
2031 if (KDB_DEBUG(MASK))
2032 kdb_printf("KDBDEBUG=0x%x\n",
2033 (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
2034
2035 return 0;
2036}
2037
2038#ifdef CONFIG_PRINTK
2039/*
2040 * kdb_dmesg - This function implements the 'dmesg' command to display
2041 * the contents of the syslog buffer.
2042 * dmesg [lines] [adjust]
2043 */
2044static int kdb_dmesg(int argc, const char **argv)
2045{
2046 int diag;
2047 int logging;
2048 int lines = 0;
2049 int adjust = 0;
2050 int n = 0;
2051 int skip = 0;
2052 struct kmsg_dump_iter iter;
2053 size_t len;
2054 char buf[201];
2055
2056 if (argc > 2)
2057 return KDB_ARGCOUNT;
2058 if (argc) {
2059 if (kstrtoint(argv[1], 0, &lines))
2060 lines = 0;
2061 if (argc > 1 && (kstrtoint(argv[2], 0, &adjust) || adjust < 0))
2062 adjust = 0;
2063 }
2064
2065 /* disable LOGGING if set */
2066 diag = kdbgetintenv("LOGGING", &logging);
2067 if (!diag && logging) {
2068 const char *setargs[] = { "set", "LOGGING", "0" };
2069 kdb_set(2, setargs);
2070 }
2071
2072 kmsg_dump_rewind(&iter);
2073 while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL))
2074 n++;
2075
2076 if (lines < 0) {
2077 if (adjust >= n)
2078 kdb_printf("buffer only contains %d lines, nothing "
2079 "printed\n", n);
2080 else if (adjust - lines >= n)
2081 kdb_printf("buffer only contains %d lines, last %d "
2082 "lines printed\n", n, n - adjust);
2083 skip = adjust;
2084 lines = abs(lines);
2085 } else if (lines > 0) {
2086 skip = n - lines - adjust;
2087 lines = abs(lines);
2088 if (adjust >= n) {
2089 kdb_printf("buffer only contains %d lines, "
2090 "nothing printed\n", n);
2091 skip = n;
2092 } else if (skip < 0) {
2093 lines += skip;
2094 skip = 0;
2095 kdb_printf("buffer only contains %d lines, first "
2096 "%d lines printed\n", n, lines);
2097 }
2098 } else {
2099 lines = n;
2100 }
2101
2102 if (skip >= n || skip < 0)
2103 return 0;
2104
2105 kmsg_dump_rewind(&iter);
2106 while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) {
2107 if (skip) {
2108 skip--;
2109 continue;
2110 }
2111 if (!lines--)
2112 break;
2113 if (KDB_FLAG(CMD_INTERRUPT))
2114 return 0;
2115
2116 kdb_printf("%.*s\n", (int)len - 1, buf);
2117 }
2118
2119 return 0;
2120}
2121#endif /* CONFIG_PRINTK */
2122
2123/* Make sure we balance enable/disable calls, must disable first. */
2124static atomic_t kdb_nmi_disabled;
2125
2126static int kdb_disable_nmi(int argc, const char *argv[])
2127{
2128 if (atomic_read(&kdb_nmi_disabled))
2129 return 0;
2130 atomic_set(&kdb_nmi_disabled, 1);
2131 arch_kgdb_ops.enable_nmi(0);
2132 return 0;
2133}
2134
2135static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2136{
2137 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2138 return -EINVAL;
2139 arch_kgdb_ops.enable_nmi(1);
2140 return 0;
2141}
2142
2143static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2144 .set = kdb_param_enable_nmi,
2145};
2146module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2147
2148/*
2149 * kdb_cpu - This function implements the 'cpu' command.
2150 * cpu [<cpunum>]
2151 * Returns:
2152 * KDB_CMD_CPU for success, a kdb diagnostic if error
2153 */
2154static void kdb_cpu_status(void)
2155{
2156 int i, start_cpu, first_print = 1;
2157 char state, prev_state = '?';
2158
2159 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2160 kdb_printf("Available cpus: ");
2161 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2162 if (!cpu_online(i)) {
2163 state = 'F'; /* cpu is offline */
2164 } else if (!kgdb_info[i].enter_kgdb) {
2165 state = 'D'; /* cpu is online but unresponsive */
2166 } else {
2167 state = ' '; /* cpu is responding to kdb */
2168 if (kdb_task_state_char(KDB_TSK(i)) == '-')
2169 state = '-'; /* idle task */
2170 }
2171 if (state != prev_state) {
2172 if (prev_state != '?') {
2173 if (!first_print)
2174 kdb_printf(", ");
2175 first_print = 0;
2176 kdb_printf("%d", start_cpu);
2177 if (start_cpu < i-1)
2178 kdb_printf("-%d", i-1);
2179 if (prev_state != ' ')
2180 kdb_printf("(%c)", prev_state);
2181 }
2182 prev_state = state;
2183 start_cpu = i;
2184 }
2185 }
2186 /* print the trailing cpus, ignoring them if they are all offline */
2187 if (prev_state != 'F') {
2188 if (!first_print)
2189 kdb_printf(", ");
2190 kdb_printf("%d", start_cpu);
2191 if (start_cpu < i-1)
2192 kdb_printf("-%d", i-1);
2193 if (prev_state != ' ')
2194 kdb_printf("(%c)", prev_state);
2195 }
2196 kdb_printf("\n");
2197}
2198
2199static int kdb_cpu(int argc, const char **argv)
2200{
2201 unsigned long cpunum;
2202 int diag;
2203
2204 if (argc == 0) {
2205 kdb_cpu_status();
2206 return 0;
2207 }
2208
2209 if (argc != 1)
2210 return KDB_ARGCOUNT;
2211
2212 diag = kdbgetularg(argv[1], &cpunum);
2213 if (diag)
2214 return diag;
2215
2216 /*
2217 * Validate cpunum
2218 */
2219 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2220 return KDB_BADCPUNUM;
2221
2222 dbg_switch_cpu = cpunum;
2223
2224 /*
2225 * Switch to other cpu
2226 */
2227 return KDB_CMD_CPU;
2228}
2229
2230/* The user may not realize that ps/bta with no parameters does not print idle
2231 * or sleeping system daemon processes, so tell them how many were suppressed.
2232 */
2233void kdb_ps_suppressed(void)
2234{
2235 int idle = 0, daemon = 0;
2236 unsigned long cpu;
2237 const struct task_struct *p, *g;
2238 for_each_online_cpu(cpu) {
2239 p = curr_task(cpu);
2240 if (kdb_task_state(p, "-"))
2241 ++idle;
2242 }
2243 for_each_process_thread(g, p) {
2244 if (kdb_task_state(p, "ims"))
2245 ++daemon;
2246 }
2247 if (idle || daemon) {
2248 if (idle)
2249 kdb_printf("%d idle process%s (state -)%s\n",
2250 idle, idle == 1 ? "" : "es",
2251 daemon ? " and " : "");
2252 if (daemon)
2253 kdb_printf("%d sleeping system daemon (state [ims]) "
2254 "process%s", daemon,
2255 daemon == 1 ? "" : "es");
2256 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2257 }
2258}
2259
2260void kdb_ps1(const struct task_struct *p)
2261{
2262 int cpu;
2263 unsigned long tmp;
2264
2265 if (!p ||
2266 copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
2267 return;
2268
2269 cpu = kdb_process_cpu(p);
2270 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2271 (void *)p, p->pid, p->parent->pid,
2272 kdb_task_has_cpu(p), kdb_process_cpu(p),
2273 kdb_task_state_char(p),
2274 (void *)(&p->thread),
2275 p == curr_task(raw_smp_processor_id()) ? '*' : ' ',
2276 p->comm);
2277 if (kdb_task_has_cpu(p)) {
2278 if (!KDB_TSK(cpu)) {
2279 kdb_printf(" Error: no saved data for this cpu\n");
2280 } else {
2281 if (KDB_TSK(cpu) != p)
2282 kdb_printf(" Error: does not match running "
2283 "process table (0x%px)\n", KDB_TSK(cpu));
2284 }
2285 }
2286}
2287
2288/*
2289 * kdb_ps - This function implements the 'ps' command which shows a
2290 * list of the active processes.
2291 *
2292 * ps [<state_chars>] Show processes, optionally selecting only those whose
2293 * state character is found in <state_chars>.
2294 */
2295static int kdb_ps(int argc, const char **argv)
2296{
2297 struct task_struct *g, *p;
2298 const char *mask;
2299 unsigned long cpu;
2300
2301 if (argc == 0)
2302 kdb_ps_suppressed();
2303 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2304 (int)(2*sizeof(void *))+2, "Task Addr",
2305 (int)(2*sizeof(void *))+2, "Thread");
2306 mask = argc ? argv[1] : kdbgetenv("PS");
2307 /* Run the active tasks first */
2308 for_each_online_cpu(cpu) {
2309 if (KDB_FLAG(CMD_INTERRUPT))
2310 return 0;
2311 p = curr_task(cpu);
2312 if (kdb_task_state(p, mask))
2313 kdb_ps1(p);
2314 }
2315 kdb_printf("\n");
2316 /* Now the real tasks */
2317 for_each_process_thread(g, p) {
2318 if (KDB_FLAG(CMD_INTERRUPT))
2319 return 0;
2320 if (kdb_task_state(p, mask))
2321 kdb_ps1(p);
2322 }
2323
2324 return 0;
2325}
2326
2327/*
2328 * kdb_pid - This function implements the 'pid' command which switches
2329 * the currently active process.
2330 * pid [<pid> | R]
2331 */
2332static int kdb_pid(int argc, const char **argv)
2333{
2334 struct task_struct *p;
2335 unsigned long val;
2336 int diag;
2337
2338 if (argc > 1)
2339 return KDB_ARGCOUNT;
2340
2341 if (argc) {
2342 if (strcmp(argv[1], "R") == 0) {
2343 p = KDB_TSK(kdb_initial_cpu);
2344 } else {
2345 diag = kdbgetularg(argv[1], &val);
2346 if (diag)
2347 return KDB_BADINT;
2348
2349 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2350 if (!p) {
2351 kdb_printf("No task with pid=%d\n", (pid_t)val);
2352 return 0;
2353 }
2354 }
2355 kdb_set_current_task(p);
2356 }
2357 kdb_printf("KDB current process is %s(pid=%d)\n",
2358 kdb_current_task->comm,
2359 kdb_current_task->pid);
2360
2361 return 0;
2362}
2363
2364static int kdb_kgdb(int argc, const char **argv)
2365{
2366 return KDB_CMD_KGDB;
2367}
2368
2369/*
2370 * kdb_help - This function implements the 'help' and '?' commands.
2371 */
2372static int kdb_help(int argc, const char **argv)
2373{
2374 kdbtab_t *kt;
2375
2376 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2377 kdb_printf("-----------------------------"
2378 "-----------------------------\n");
2379 list_for_each_entry(kt, &kdb_cmds_head, list_node) {
2380 char *space = "";
2381 if (KDB_FLAG(CMD_INTERRUPT))
2382 return 0;
2383 if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
2384 continue;
2385 if (strlen(kt->usage) > 20)
2386 space = "\n ";
2387 kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
2388 kt->usage, space, kt->help);
2389 }
2390 return 0;
2391}
2392
2393/*
2394 * kdb_kill - This function implements the 'kill' commands.
2395 */
2396static int kdb_kill(int argc, const char **argv)
2397{
2398 long sig, pid;
2399 struct task_struct *p;
2400
2401 if (argc != 2)
2402 return KDB_ARGCOUNT;
2403
2404 if (kstrtol(argv[1], 0, &sig))
2405 return KDB_BADINT;
2406 if ((sig >= 0) || !valid_signal(-sig)) {
2407 kdb_printf("Invalid signal parameter.<-signal>\n");
2408 return 0;
2409 }
2410 sig = -sig;
2411
2412 if (kstrtol(argv[2], 0, &pid))
2413 return KDB_BADINT;
2414 if (pid <= 0) {
2415 kdb_printf("Process ID must be large than 0.\n");
2416 return 0;
2417 }
2418
2419 /* Find the process. */
2420 p = find_task_by_pid_ns(pid, &init_pid_ns);
2421 if (!p) {
2422 kdb_printf("The specified process isn't found.\n");
2423 return 0;
2424 }
2425 p = p->group_leader;
2426 kdb_send_sig(p, sig);
2427 return 0;
2428}
2429
2430/*
2431 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2432 * I cannot call that code directly from kdb, it has an unconditional
2433 * cli()/sti() and calls routines that take locks which can stop the debugger.
2434 */
2435static void kdb_sysinfo(struct sysinfo *val)
2436{
2437 u64 uptime = ktime_get_mono_fast_ns();
2438
2439 memset(val, 0, sizeof(*val));
2440 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2441 val->loads[0] = avenrun[0];
2442 val->loads[1] = avenrun[1];
2443 val->loads[2] = avenrun[2];
2444 val->procs = nr_threads-1;
2445 si_meminfo(val);
2446
2447 return;
2448}
2449
2450/*
2451 * kdb_summary - This function implements the 'summary' command.
2452 */
2453static int kdb_summary(int argc, const char **argv)
2454{
2455 time64_t now;
2456 struct sysinfo val;
2457
2458 if (argc)
2459 return KDB_ARGCOUNT;
2460
2461 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2462 kdb_printf("release %s\n", init_uts_ns.name.release);
2463 kdb_printf("version %s\n", init_uts_ns.name.version);
2464 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2465 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2466 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2467
2468 now = __ktime_get_real_seconds();
2469 kdb_printf("date %ptTs tz_minuteswest %d\n", &now, sys_tz.tz_minuteswest);
2470 kdb_sysinfo(&val);
2471 kdb_printf("uptime ");
2472 if (val.uptime > (24*60*60)) {
2473 int days = val.uptime / (24*60*60);
2474 val.uptime %= (24*60*60);
2475 kdb_printf("%d day%s ", days, str_plural(days));
2476 }
2477 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2478
2479 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2480 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2481 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2482 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2483
2484 /* Display in kilobytes */
2485#define K(x) ((x) << (PAGE_SHIFT - 10))
2486 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2487 "Buffers: %8lu kB\n",
2488 K(val.totalram), K(val.freeram), K(val.bufferram));
2489 return 0;
2490}
2491
2492/*
2493 * kdb_per_cpu - This function implements the 'per_cpu' command.
2494 */
2495static int kdb_per_cpu(int argc, const char **argv)
2496{
2497 char fmtstr[64];
2498 int cpu, diag, nextarg = 1;
2499 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2500
2501 if (argc < 1 || argc > 3)
2502 return KDB_ARGCOUNT;
2503
2504 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2505 if (diag)
2506 return diag;
2507
2508 if (argc >= 2) {
2509 diag = kdbgetularg(argv[2], &bytesperword);
2510 if (diag)
2511 return diag;
2512 }
2513 if (!bytesperword)
2514 bytesperword = KDB_WORD_SIZE;
2515 else if (bytesperword > KDB_WORD_SIZE)
2516 return KDB_BADWIDTH;
2517 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2518 if (argc >= 3) {
2519 diag = kdbgetularg(argv[3], &whichcpu);
2520 if (diag)
2521 return diag;
2522 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2523 kdb_printf("cpu %ld is not online\n", whichcpu);
2524 return KDB_BADCPUNUM;
2525 }
2526 }
2527
2528 /* Most architectures use __per_cpu_offset[cpu], some use
2529 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2530 */
2531#ifdef __per_cpu_offset
2532#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2533#else
2534#ifdef CONFIG_SMP
2535#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2536#else
2537#define KDB_PCU(cpu) 0
2538#endif
2539#endif
2540 for_each_online_cpu(cpu) {
2541 if (KDB_FLAG(CMD_INTERRUPT))
2542 return 0;
2543
2544 if (whichcpu != ~0UL && whichcpu != cpu)
2545 continue;
2546 addr = symaddr + KDB_PCU(cpu);
2547 diag = kdb_getword(&val, addr, bytesperword);
2548 if (diag) {
2549 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2550 "read, diag=%d\n", cpu, addr, diag);
2551 continue;
2552 }
2553 kdb_printf("%5d ", cpu);
2554 kdb_md_line(fmtstr, addr,
2555 bytesperword == KDB_WORD_SIZE,
2556 1, bytesperword, 1, 1, 0);
2557 }
2558#undef KDB_PCU
2559 return 0;
2560}
2561
2562/*
2563 * display help for the use of cmd | grep pattern
2564 */
2565static int kdb_grep_help(int argc, const char **argv)
2566{
2567 kdb_printf("Usage of cmd args | grep pattern:\n");
2568 kdb_printf(" Any command's output may be filtered through an ");
2569 kdb_printf("emulated 'pipe'.\n");
2570 kdb_printf(" 'grep' is just a key word.\n");
2571 kdb_printf(" The pattern may include a very limited set of "
2572 "metacharacters:\n");
2573 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2574 kdb_printf(" And if there are spaces in the pattern, you may "
2575 "quote it:\n");
2576 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2577 " or \"^pat tern$\"\n");
2578 return 0;
2579}
2580
2581/**
2582 * kdb_register() - This function is used to register a kernel debugger
2583 * command.
2584 * @cmd: pointer to kdb command
2585 *
2586 * Note that it's the job of the caller to keep the memory for the cmd
2587 * allocated until unregister is called.
2588 */
2589int kdb_register(kdbtab_t *cmd)
2590{
2591 kdbtab_t *kp;
2592
2593 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
2594 if (strcmp(kp->name, cmd->name) == 0) {
2595 kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
2596 cmd->name, cmd->func, cmd->help);
2597 return 1;
2598 }
2599 }
2600
2601 list_add_tail(&cmd->list_node, &kdb_cmds_head);
2602 return 0;
2603}
2604EXPORT_SYMBOL_GPL(kdb_register);
2605
2606/**
2607 * kdb_register_table() - This function is used to register a kdb command
2608 * table.
2609 * @kp: pointer to kdb command table
2610 * @len: length of kdb command table
2611 */
2612void kdb_register_table(kdbtab_t *kp, size_t len)
2613{
2614 while (len--) {
2615 list_add_tail(&kp->list_node, &kdb_cmds_head);
2616 kp++;
2617 }
2618}
2619
2620/**
2621 * kdb_unregister() - This function is used to unregister a kernel debugger
2622 * command. It is generally called when a module which
2623 * implements kdb command is unloaded.
2624 * @cmd: pointer to kdb command
2625 */
2626void kdb_unregister(kdbtab_t *cmd)
2627{
2628 list_del(&cmd->list_node);
2629}
2630EXPORT_SYMBOL_GPL(kdb_unregister);
2631
2632static kdbtab_t maintab[] = {
2633 { .name = "md",
2634 .func = kdb_md,
2635 .usage = "<vaddr>",
2636 .help = "Display Memory Contents, also mdWcN, e.g. md8c1",
2637 .minlen = 1,
2638 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2639 },
2640 { .name = "mdr",
2641 .func = kdb_md,
2642 .usage = "<vaddr> <bytes>",
2643 .help = "Display Raw Memory",
2644 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2645 },
2646 { .name = "mdp",
2647 .func = kdb_md,
2648 .usage = "<paddr> <bytes>",
2649 .help = "Display Physical Memory",
2650 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2651 },
2652 { .name = "mds",
2653 .func = kdb_md,
2654 .usage = "<vaddr>",
2655 .help = "Display Memory Symbolically",
2656 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2657 },
2658 { .name = "mm",
2659 .func = kdb_mm,
2660 .usage = "<vaddr> <contents>",
2661 .help = "Modify Memory Contents",
2662 .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
2663 },
2664 { .name = "go",
2665 .func = kdb_go,
2666 .usage = "[<vaddr>]",
2667 .help = "Continue Execution",
2668 .minlen = 1,
2669 .flags = KDB_ENABLE_REG_WRITE |
2670 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2671 },
2672 { .name = "rd",
2673 .func = kdb_rd,
2674 .usage = "",
2675 .help = "Display Registers",
2676 .flags = KDB_ENABLE_REG_READ,
2677 },
2678 { .name = "rm",
2679 .func = kdb_rm,
2680 .usage = "<reg> <contents>",
2681 .help = "Modify Registers",
2682 .flags = KDB_ENABLE_REG_WRITE,
2683 },
2684 { .name = "ef",
2685 .func = kdb_ef,
2686 .usage = "<vaddr>",
2687 .help = "Display exception frame",
2688 .flags = KDB_ENABLE_MEM_READ,
2689 },
2690 { .name = "bt",
2691 .func = kdb_bt,
2692 .usage = "[<vaddr>]",
2693 .help = "Stack traceback",
2694 .minlen = 1,
2695 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2696 },
2697 { .name = "btp",
2698 .func = kdb_bt,
2699 .usage = "<pid>",
2700 .help = "Display stack for process <pid>",
2701 .flags = KDB_ENABLE_INSPECT,
2702 },
2703 { .name = "bta",
2704 .func = kdb_bt,
2705 .usage = "[<state_chars>|A]",
2706 .help = "Backtrace all processes whose state matches",
2707 .flags = KDB_ENABLE_INSPECT,
2708 },
2709 { .name = "btc",
2710 .func = kdb_bt,
2711 .usage = "",
2712 .help = "Backtrace current process on each cpu",
2713 .flags = KDB_ENABLE_INSPECT,
2714 },
2715 { .name = "btt",
2716 .func = kdb_bt,
2717 .usage = "<vaddr>",
2718 .help = "Backtrace process given its struct task address",
2719 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2720 },
2721 { .name = "env",
2722 .func = kdb_env,
2723 .usage = "",
2724 .help = "Show environment variables",
2725 .flags = KDB_ENABLE_ALWAYS_SAFE,
2726 },
2727 { .name = "set",
2728 .func = kdb_set,
2729 .usage = "",
2730 .help = "Set environment variables",
2731 .flags = KDB_ENABLE_ALWAYS_SAFE,
2732 },
2733 { .name = "help",
2734 .func = kdb_help,
2735 .usage = "",
2736 .help = "Display Help Message",
2737 .minlen = 1,
2738 .flags = KDB_ENABLE_ALWAYS_SAFE,
2739 },
2740 { .name = "?",
2741 .func = kdb_help,
2742 .usage = "",
2743 .help = "Display Help Message",
2744 .flags = KDB_ENABLE_ALWAYS_SAFE,
2745 },
2746 { .name = "cpu",
2747 .func = kdb_cpu,
2748 .usage = "<cpunum>",
2749 .help = "Switch to new cpu",
2750 .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2751 },
2752 { .name = "kgdb",
2753 .func = kdb_kgdb,
2754 .usage = "",
2755 .help = "Enter kgdb mode",
2756 .flags = 0,
2757 },
2758 { .name = "ps",
2759 .func = kdb_ps,
2760 .usage = "[<state_chars>|A]",
2761 .help = "Display active task list",
2762 .flags = KDB_ENABLE_INSPECT,
2763 },
2764 { .name = "pid",
2765 .func = kdb_pid,
2766 .usage = "<pidnum>",
2767 .help = "Switch to another task",
2768 .flags = KDB_ENABLE_INSPECT,
2769 },
2770 { .name = "reboot",
2771 .func = kdb_reboot,
2772 .usage = "",
2773 .help = "Reboot the machine immediately",
2774 .flags = KDB_ENABLE_REBOOT,
2775 },
2776#if defined(CONFIG_MODULES)
2777 { .name = "lsmod",
2778 .func = kdb_lsmod,
2779 .usage = "",
2780 .help = "List loaded kernel modules",
2781 .flags = KDB_ENABLE_INSPECT,
2782 },
2783#endif
2784#if defined(CONFIG_MAGIC_SYSRQ)
2785 { .name = "sr",
2786 .func = kdb_sr,
2787 .usage = "<key>",
2788 .help = "Magic SysRq key",
2789 .flags = KDB_ENABLE_ALWAYS_SAFE,
2790 },
2791#endif
2792#if defined(CONFIG_PRINTK)
2793 { .name = "dmesg",
2794 .func = kdb_dmesg,
2795 .usage = "[lines]",
2796 .help = "Display syslog buffer",
2797 .flags = KDB_ENABLE_ALWAYS_SAFE,
2798 },
2799#endif
2800 { .name = "defcmd",
2801 .func = kdb_defcmd,
2802 .usage = "name \"usage\" \"help\"",
2803 .help = "Define a set of commands, down to endefcmd",
2804 /*
2805 * Macros are always safe because when executed each
2806 * internal command re-enters kdb_parse() and is safety
2807 * checked individually.
2808 */
2809 .flags = KDB_ENABLE_ALWAYS_SAFE,
2810 },
2811 { .name = "kill",
2812 .func = kdb_kill,
2813 .usage = "<-signal> <pid>",
2814 .help = "Send a signal to a process",
2815 .flags = KDB_ENABLE_SIGNAL,
2816 },
2817 { .name = "summary",
2818 .func = kdb_summary,
2819 .usage = "",
2820 .help = "Summarize the system",
2821 .minlen = 4,
2822 .flags = KDB_ENABLE_ALWAYS_SAFE,
2823 },
2824 { .name = "per_cpu",
2825 .func = kdb_per_cpu,
2826 .usage = "<sym> [<bytes>] [<cpu>]",
2827 .help = "Display per_cpu variables",
2828 .minlen = 3,
2829 .flags = KDB_ENABLE_MEM_READ,
2830 },
2831 { .name = "grephelp",
2832 .func = kdb_grep_help,
2833 .usage = "",
2834 .help = "Display help on | grep",
2835 .flags = KDB_ENABLE_ALWAYS_SAFE,
2836 },
2837};
2838
2839static kdbtab_t nmicmd = {
2840 .name = "disable_nmi",
2841 .func = kdb_disable_nmi,
2842 .usage = "",
2843 .help = "Disable NMI entry to KDB",
2844 .flags = KDB_ENABLE_ALWAYS_SAFE,
2845};
2846
2847/* Initialize the kdb command table. */
2848static void __init kdb_inittab(void)
2849{
2850 kdb_register_table(maintab, ARRAY_SIZE(maintab));
2851 if (arch_kgdb_ops.enable_nmi)
2852 kdb_register_table(&nmicmd, 1);
2853}
2854
2855/* Execute any commands defined in kdb_cmds. */
2856static void __init kdb_cmd_init(void)
2857{
2858 int i, diag;
2859 for (i = 0; kdb_cmds[i]; ++i) {
2860 diag = kdb_parse(kdb_cmds[i]);
2861 if (diag)
2862 kdb_printf("kdb command %s failed, kdb diag %d\n",
2863 kdb_cmds[i], diag);
2864 }
2865 if (defcmd_in_progress) {
2866 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2867 kdb_parse("endefcmd");
2868 }
2869}
2870
2871/* Initialize kdb_printf, breakpoint tables and kdb state */
2872void __init kdb_init(int lvl)
2873{
2874 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2875 int i;
2876
2877 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2878 return;
2879 for (i = kdb_init_lvl; i < lvl; i++) {
2880 switch (i) {
2881 case KDB_NOT_INITIALIZED:
2882 kdb_inittab(); /* Initialize Command Table */
2883 kdb_initbptab(); /* Initialize Breakpoints */
2884 break;
2885 case KDB_INIT_EARLY:
2886 kdb_cmd_init(); /* Build kdb_cmds tables */
2887 break;
2888 }
2889 }
2890 kdb_init_lvl = lvl;
2891}
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/module.h>
30#include <linux/moduleparam.h>
31#include <linux/mm.h>
32#include <linux/init.h>
33#include <linux/kallsyms.h>
34#include <linux/kgdb.h>
35#include <linux/kdb.h>
36#include <linux/notifier.h>
37#include <linux/interrupt.h>
38#include <linux/delay.h>
39#include <linux/nmi.h>
40#include <linux/time.h>
41#include <linux/ptrace.h>
42#include <linux/sysctl.h>
43#include <linux/cpu.h>
44#include <linux/kdebug.h>
45#include <linux/proc_fs.h>
46#include <linux/uaccess.h>
47#include <linux/slab.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_commands describes the available commands. */
88static kdbtab_t *kdb_commands;
89#define KDB_BASE_CMD_MAX 50
90static int kdb_max_commands = KDB_BASE_CMD_MAX;
91static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
92#define for_each_kdbcmd(cmd, num) \
93 for ((cmd) = kdb_base_commands, (num) = 0; \
94 num < kdb_max_commands; \
95 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
96
97typedef struct _kdbmsg {
98 int km_diag; /* kdb diagnostic */
99 char *km_msg; /* Corresponding message text */
100} kdbmsg_t;
101
102#define KDBMSG(msgnum, text) \
103 { KDB_##msgnum, text }
104
105static kdbmsg_t kdbmsgs[] = {
106 KDBMSG(NOTFOUND, "Command Not Found"),
107 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
108 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
109 "8 is only allowed on 64 bit systems"),
110 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
111 KDBMSG(NOTENV, "Cannot find environment variable"),
112 KDBMSG(NOENVVALUE, "Environment variable should have value"),
113 KDBMSG(NOTIMP, "Command not implemented"),
114 KDBMSG(ENVFULL, "Environment full"),
115 KDBMSG(ENVBUFFULL, "Environment buffer full"),
116 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
117#ifdef CONFIG_CPU_XSCALE
118 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
119#else
120 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
121#endif
122 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
123 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
124 KDBMSG(BADMODE, "Invalid IDMODE"),
125 KDBMSG(BADINT, "Illegal numeric value"),
126 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
127 KDBMSG(BADREG, "Invalid register name"),
128 KDBMSG(BADCPUNUM, "Invalid cpu number"),
129 KDBMSG(BADLENGTH, "Invalid length field"),
130 KDBMSG(NOBP, "No Breakpoint exists"),
131 KDBMSG(BADADDR, "Invalid address"),
132 KDBMSG(NOPERM, "Permission denied"),
133};
134#undef KDBMSG
135
136static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
137
138
139/*
140 * Initial environment. This is all kept static and local to
141 * this file. We don't want to rely on the memory allocation
142 * mechanisms in the kernel, so we use a very limited allocate-only
143 * heap for new and altered environment variables. The entire
144 * environment is limited to a fixed number of entries (add more
145 * to __env[] if required) and a fixed amount of heap (add more to
146 * KDB_ENVBUFSIZE if required).
147 */
148
149static char *__env[] = {
150#if defined(CONFIG_SMP)
151 "PROMPT=[%d]kdb> ",
152#else
153 "PROMPT=kdb> ",
154#endif
155 "MOREPROMPT=more> ",
156 "RADIX=16",
157 "MDCOUNT=8", /* lines of md output */
158 KDB_PLATFORM_ENV,
159 "DTABCOUNT=30",
160 "NOSECT=1",
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176 (char *)0,
177 (char *)0,
178 (char *)0,
179 (char *)0,
180 (char *)0,
181 (char *)0,
182 (char *)0,
183 (char *)0,
184 (char *)0,
185};
186
187static const int __nenv = ARRAY_SIZE(__env);
188
189struct task_struct *kdb_curr_task(int cpu)
190{
191 struct task_struct *p = curr_task(cpu);
192#ifdef _TIF_MCA_INIT
193 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
194 p = krp->p;
195#endif
196 return p;
197}
198
199/*
200 * Check whether the flags of the current command and the permissions
201 * of the kdb console has allow a command to be run.
202 */
203static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
204 bool no_args)
205{
206 /* permissions comes from userspace so needs massaging slightly */
207 permissions &= KDB_ENABLE_MASK;
208 permissions |= KDB_ENABLE_ALWAYS_SAFE;
209
210 /* some commands change group when launched with no arguments */
211 if (no_args)
212 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
213
214 flags |= KDB_ENABLE_ALL;
215
216 return permissions & flags;
217}
218
219/*
220 * kdbgetenv - This function will return the character string value of
221 * an environment variable.
222 * Parameters:
223 * match A character string representing an environment variable.
224 * Returns:
225 * NULL No environment variable matches 'match'
226 * char* Pointer to string value of environment variable.
227 */
228char *kdbgetenv(const char *match)
229{
230 char **ep = __env;
231 int matchlen = strlen(match);
232 int i;
233
234 for (i = 0; i < __nenv; i++) {
235 char *e = *ep++;
236
237 if (!e)
238 continue;
239
240 if ((strncmp(match, e, matchlen) == 0)
241 && ((e[matchlen] == '\0')
242 || (e[matchlen] == '='))) {
243 char *cp = strchr(e, '=');
244 return cp ? ++cp : "";
245 }
246 }
247 return NULL;
248}
249
250/*
251 * kdballocenv - This function is used to allocate bytes for
252 * environment entries.
253 * Parameters:
254 * match A character string representing a numeric value
255 * Outputs:
256 * *value the unsigned long representation of the env variable 'match'
257 * Returns:
258 * Zero on success, a kdb diagnostic on failure.
259 * Remarks:
260 * We use a static environment buffer (envbuffer) to hold the values
261 * of dynamically generated environment variables (see kdb_set). Buffer
262 * space once allocated is never free'd, so over time, the amount of space
263 * (currently 512 bytes) will be exhausted if env variables are changed
264 * frequently.
265 */
266static char *kdballocenv(size_t bytes)
267{
268#define KDB_ENVBUFSIZE 512
269 static char envbuffer[KDB_ENVBUFSIZE];
270 static int envbufsize;
271 char *ep = NULL;
272
273 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
274 ep = &envbuffer[envbufsize];
275 envbufsize += bytes;
276 }
277 return ep;
278}
279
280/*
281 * kdbgetulenv - This function will return the value of an unsigned
282 * long-valued environment variable.
283 * Parameters:
284 * match A character string representing a numeric value
285 * Outputs:
286 * *value the unsigned long represntation of the env variable 'match'
287 * Returns:
288 * Zero on success, a kdb diagnostic on failure.
289 */
290static int kdbgetulenv(const char *match, unsigned long *value)
291{
292 char *ep;
293
294 ep = kdbgetenv(match);
295 if (!ep)
296 return KDB_NOTENV;
297 if (strlen(ep) == 0)
298 return KDB_NOENVVALUE;
299
300 *value = simple_strtoul(ep, NULL, 0);
301
302 return 0;
303}
304
305/*
306 * kdbgetintenv - This function will return the value of an
307 * integer-valued environment variable.
308 * Parameters:
309 * match A character string representing an integer-valued env variable
310 * Outputs:
311 * *value the integer representation of the environment variable 'match'
312 * Returns:
313 * Zero on success, a kdb diagnostic on failure.
314 */
315int kdbgetintenv(const char *match, int *value)
316{
317 unsigned long val;
318 int diag;
319
320 diag = kdbgetulenv(match, &val);
321 if (!diag)
322 *value = (int) val;
323 return diag;
324}
325
326/*
327 * kdbgetularg - This function will convert a numeric string into an
328 * unsigned long value.
329 * Parameters:
330 * arg A character string representing a numeric value
331 * Outputs:
332 * *value the unsigned long represntation of arg.
333 * Returns:
334 * Zero on success, a kdb diagnostic on failure.
335 */
336int kdbgetularg(const char *arg, unsigned long *value)
337{
338 char *endp;
339 unsigned long val;
340
341 val = simple_strtoul(arg, &endp, 0);
342
343 if (endp == arg) {
344 /*
345 * Also try base 16, for us folks too lazy to type the
346 * leading 0x...
347 */
348 val = simple_strtoul(arg, &endp, 16);
349 if (endp == arg)
350 return KDB_BADINT;
351 }
352
353 *value = val;
354
355 return 0;
356}
357
358int kdbgetu64arg(const char *arg, u64 *value)
359{
360 char *endp;
361 u64 val;
362
363 val = simple_strtoull(arg, &endp, 0);
364
365 if (endp == arg) {
366
367 val = simple_strtoull(arg, &endp, 16);
368 if (endp == arg)
369 return KDB_BADINT;
370 }
371
372 *value = val;
373
374 return 0;
375}
376
377/*
378 * kdb_set - This function implements the 'set' command. Alter an
379 * existing environment variable or create a new one.
380 */
381int kdb_set(int argc, const char **argv)
382{
383 int i;
384 char *ep;
385 size_t varlen, vallen;
386
387 /*
388 * we can be invoked two ways:
389 * set var=value argv[1]="var", argv[2]="value"
390 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
391 * - if the latter, shift 'em down.
392 */
393 if (argc == 3) {
394 argv[2] = argv[3];
395 argc--;
396 }
397
398 if (argc != 2)
399 return KDB_ARGCOUNT;
400
401 /*
402 * Censor sensitive variables
403 */
404 if (strcmp(argv[1], "PROMPT") == 0 &&
405 !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
406 return KDB_NOPERM;
407
408 /*
409 * Check for internal variables
410 */
411 if (strcmp(argv[1], "KDBDEBUG") == 0) {
412 unsigned int debugflags;
413 char *cp;
414
415 debugflags = simple_strtoul(argv[2], &cp, 0);
416 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
417 kdb_printf("kdb: illegal debug flags '%s'\n",
418 argv[2]);
419 return 0;
420 }
421 kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK))
422 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
423
424 return 0;
425 }
426
427 /*
428 * Tokenizer squashed the '=' sign. argv[1] is variable
429 * name, argv[2] = value.
430 */
431 varlen = strlen(argv[1]);
432 vallen = strlen(argv[2]);
433 ep = kdballocenv(varlen + vallen + 2);
434 if (ep == (char *)0)
435 return KDB_ENVBUFFULL;
436
437 sprintf(ep, "%s=%s", argv[1], argv[2]);
438
439 ep[varlen+vallen+1] = '\0';
440
441 for (i = 0; i < __nenv; i++) {
442 if (__env[i]
443 && ((strncmp(__env[i], argv[1], varlen) == 0)
444 && ((__env[i][varlen] == '\0')
445 || (__env[i][varlen] == '=')))) {
446 __env[i] = ep;
447 return 0;
448 }
449 }
450
451 /*
452 * Wasn't existing variable. Fit into slot.
453 */
454 for (i = 0; i < __nenv-1; i++) {
455 if (__env[i] == (char *)0) {
456 __env[i] = ep;
457 return 0;
458 }
459 }
460
461 return KDB_ENVFULL;
462}
463
464static int kdb_check_regs(void)
465{
466 if (!kdb_current_regs) {
467 kdb_printf("No current kdb registers."
468 " You may need to select another task\n");
469 return KDB_BADREG;
470 }
471 return 0;
472}
473
474/*
475 * kdbgetaddrarg - This function is responsible for parsing an
476 * address-expression and returning the value of the expression,
477 * symbol name, and offset to the caller.
478 *
479 * The argument may consist of a numeric value (decimal or
480 * hexidecimal), a symbol name, a register name (preceded by the
481 * percent sign), an environment variable with a numeric value
482 * (preceded by a dollar sign) or a simple arithmetic expression
483 * consisting of a symbol name, +/-, and a numeric constant value
484 * (offset).
485 * Parameters:
486 * argc - count of arguments in argv
487 * argv - argument vector
488 * *nextarg - index to next unparsed argument in argv[]
489 * regs - Register state at time of KDB entry
490 * Outputs:
491 * *value - receives the value of the address-expression
492 * *offset - receives the offset specified, if any
493 * *name - receives the symbol name, if any
494 * *nextarg - index to next unparsed argument in argv[]
495 * Returns:
496 * zero is returned on success, a kdb diagnostic code is
497 * returned on error.
498 */
499int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
500 unsigned long *value, long *offset,
501 char **name)
502{
503 unsigned long addr;
504 unsigned long off = 0;
505 int positive;
506 int diag;
507 int found = 0;
508 char *symname;
509 char symbol = '\0';
510 char *cp;
511 kdb_symtab_t symtab;
512
513 /*
514 * If the enable flags prohibit both arbitrary memory access
515 * and flow control then there are no reasonable grounds to
516 * provide symbol lookup.
517 */
518 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
519 kdb_cmd_enabled, false))
520 return KDB_NOPERM;
521
522 /*
523 * Process arguments which follow the following syntax:
524 *
525 * symbol | numeric-address [+/- numeric-offset]
526 * %register
527 * $environment-variable
528 */
529
530 if (*nextarg > argc)
531 return KDB_ARGCOUNT;
532
533 symname = (char *)argv[*nextarg];
534
535 /*
536 * If there is no whitespace between the symbol
537 * or address and the '+' or '-' symbols, we
538 * remember the character and replace it with a
539 * null so the symbol/value can be properly parsed
540 */
541 cp = strpbrk(symname, "+-");
542 if (cp != NULL) {
543 symbol = *cp;
544 *cp++ = '\0';
545 }
546
547 if (symname[0] == '$') {
548 diag = kdbgetulenv(&symname[1], &addr);
549 if (diag)
550 return diag;
551 } else if (symname[0] == '%') {
552 diag = kdb_check_regs();
553 if (diag)
554 return diag;
555 /* Implement register values with % at a later time as it is
556 * arch optional.
557 */
558 return KDB_NOTIMP;
559 } else {
560 found = kdbgetsymval(symname, &symtab);
561 if (found) {
562 addr = symtab.sym_start;
563 } else {
564 diag = kdbgetularg(argv[*nextarg], &addr);
565 if (diag)
566 return diag;
567 }
568 }
569
570 if (!found)
571 found = kdbnearsym(addr, &symtab);
572
573 (*nextarg)++;
574
575 if (name)
576 *name = symname;
577 if (value)
578 *value = addr;
579 if (offset && name && *name)
580 *offset = addr - symtab.sym_start;
581
582 if ((*nextarg > argc)
583 && (symbol == '\0'))
584 return 0;
585
586 /*
587 * check for +/- and offset
588 */
589
590 if (symbol == '\0') {
591 if ((argv[*nextarg][0] != '+')
592 && (argv[*nextarg][0] != '-')) {
593 /*
594 * Not our argument. Return.
595 */
596 return 0;
597 } else {
598 positive = (argv[*nextarg][0] == '+');
599 (*nextarg)++;
600 }
601 } else
602 positive = (symbol == '+');
603
604 /*
605 * Now there must be an offset!
606 */
607 if ((*nextarg > argc)
608 && (symbol == '\0')) {
609 return KDB_INVADDRFMT;
610 }
611
612 if (!symbol) {
613 cp = (char *)argv[*nextarg];
614 (*nextarg)++;
615 }
616
617 diag = kdbgetularg(cp, &off);
618 if (diag)
619 return diag;
620
621 if (!positive)
622 off = -off;
623
624 if (offset)
625 *offset += off;
626
627 if (value)
628 *value += off;
629
630 return 0;
631}
632
633static void kdb_cmderror(int diag)
634{
635 int i;
636
637 if (diag >= 0) {
638 kdb_printf("no error detected (diagnostic is %d)\n", diag);
639 return;
640 }
641
642 for (i = 0; i < __nkdb_err; i++) {
643 if (kdbmsgs[i].km_diag == diag) {
644 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
645 return;
646 }
647 }
648
649 kdb_printf("Unknown diag %d\n", -diag);
650}
651
652/*
653 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
654 * command which defines one command as a set of other commands,
655 * terminated by endefcmd. kdb_defcmd processes the initial
656 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
657 * the following commands until 'endefcmd'.
658 * Inputs:
659 * argc argument count
660 * argv argument vector
661 * Returns:
662 * zero for success, a kdb diagnostic if error
663 */
664struct defcmd_set {
665 int count;
666 bool usable;
667 char *name;
668 char *usage;
669 char *help;
670 char **command;
671};
672static struct defcmd_set *defcmd_set;
673static int defcmd_set_count;
674static bool defcmd_in_progress;
675
676/* Forward references */
677static int kdb_exec_defcmd(int argc, const char **argv);
678
679static int kdb_defcmd2(const char *cmdstr, const char *argv0)
680{
681 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
682 char **save_command = s->command;
683 if (strcmp(argv0, "endefcmd") == 0) {
684 defcmd_in_progress = false;
685 if (!s->count)
686 s->usable = false;
687 if (s->usable)
688 /* macros are always safe because when executed each
689 * internal command re-enters kdb_parse() and is
690 * safety checked individually.
691 */
692 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
693 s->help, 0,
694 KDB_ENABLE_ALWAYS_SAFE);
695 return 0;
696 }
697 if (!s->usable)
698 return KDB_NOTIMP;
699 s->command = kcalloc(s->count + 1, sizeof(*(s->command)), GFP_KDB);
700 if (!s->command) {
701 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
702 cmdstr);
703 s->usable = false;
704 return KDB_NOTIMP;
705 }
706 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
707 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
708 kfree(save_command);
709 return 0;
710}
711
712static int kdb_defcmd(int argc, const char **argv)
713{
714 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
715 if (defcmd_in_progress) {
716 kdb_printf("kdb: nested defcmd detected, assuming missing "
717 "endefcmd\n");
718 kdb_defcmd2("endefcmd", "endefcmd");
719 }
720 if (argc == 0) {
721 int i;
722 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
723 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
724 s->usage, s->help);
725 for (i = 0; i < s->count; ++i)
726 kdb_printf("%s", s->command[i]);
727 kdb_printf("endefcmd\n");
728 }
729 return 0;
730 }
731 if (argc != 3)
732 return KDB_ARGCOUNT;
733 if (in_dbg_master()) {
734 kdb_printf("Command only available during kdb_init()\n");
735 return KDB_NOTIMP;
736 }
737 defcmd_set = kmalloc_array(defcmd_set_count + 1, sizeof(*defcmd_set),
738 GFP_KDB);
739 if (!defcmd_set)
740 goto fail_defcmd;
741 memcpy(defcmd_set, save_defcmd_set,
742 defcmd_set_count * sizeof(*defcmd_set));
743 s = defcmd_set + defcmd_set_count;
744 memset(s, 0, sizeof(*s));
745 s->usable = true;
746 s->name = kdb_strdup(argv[1], GFP_KDB);
747 if (!s->name)
748 goto fail_name;
749 s->usage = kdb_strdup(argv[2], GFP_KDB);
750 if (!s->usage)
751 goto fail_usage;
752 s->help = kdb_strdup(argv[3], GFP_KDB);
753 if (!s->help)
754 goto fail_help;
755 if (s->usage[0] == '"') {
756 strcpy(s->usage, argv[2]+1);
757 s->usage[strlen(s->usage)-1] = '\0';
758 }
759 if (s->help[0] == '"') {
760 strcpy(s->help, argv[3]+1);
761 s->help[strlen(s->help)-1] = '\0';
762 }
763 ++defcmd_set_count;
764 defcmd_in_progress = true;
765 kfree(save_defcmd_set);
766 return 0;
767fail_help:
768 kfree(s->usage);
769fail_usage:
770 kfree(s->name);
771fail_name:
772 kfree(defcmd_set);
773fail_defcmd:
774 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
775 defcmd_set = save_defcmd_set;
776 return KDB_NOTIMP;
777}
778
779/*
780 * kdb_exec_defcmd - Execute the set of commands associated with this
781 * defcmd name.
782 * Inputs:
783 * argc argument count
784 * argv argument vector
785 * Returns:
786 * zero for success, a kdb diagnostic if error
787 */
788static int kdb_exec_defcmd(int argc, const char **argv)
789{
790 int i, ret;
791 struct defcmd_set *s;
792 if (argc != 0)
793 return KDB_ARGCOUNT;
794 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
795 if (strcmp(s->name, argv[0]) == 0)
796 break;
797 }
798 if (i == defcmd_set_count) {
799 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
800 argv[0]);
801 return KDB_NOTIMP;
802 }
803 for (i = 0; i < s->count; ++i) {
804 /* Recursive use of kdb_parse, do not use argv after
805 * this point */
806 argv = NULL;
807 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
808 ret = kdb_parse(s->command[i]);
809 if (ret)
810 return ret;
811 }
812 return 0;
813}
814
815/* Command history */
816#define KDB_CMD_HISTORY_COUNT 32
817#define CMD_BUFLEN 200 /* kdb_printf: max printline
818 * size == 256 */
819static unsigned int cmd_head, cmd_tail;
820static unsigned int cmdptr;
821static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
822static char cmd_cur[CMD_BUFLEN];
823
824/*
825 * The "str" argument may point to something like | grep xyz
826 */
827static void parse_grep(const char *str)
828{
829 int len;
830 char *cp = (char *)str, *cp2;
831
832 /* sanity check: we should have been called with the \ first */
833 if (*cp != '|')
834 return;
835 cp++;
836 while (isspace(*cp))
837 cp++;
838 if (!str_has_prefix(cp, "grep ")) {
839 kdb_printf("invalid 'pipe', see grephelp\n");
840 return;
841 }
842 cp += 5;
843 while (isspace(*cp))
844 cp++;
845 cp2 = strchr(cp, '\n');
846 if (cp2)
847 *cp2 = '\0'; /* remove the trailing newline */
848 len = strlen(cp);
849 if (len == 0) {
850 kdb_printf("invalid 'pipe', see grephelp\n");
851 return;
852 }
853 /* now cp points to a nonzero length search string */
854 if (*cp == '"') {
855 /* allow it be "x y z" by removing the "'s - there must
856 be two of them */
857 cp++;
858 cp2 = strchr(cp, '"');
859 if (!cp2) {
860 kdb_printf("invalid quoted string, see grephelp\n");
861 return;
862 }
863 *cp2 = '\0'; /* end the string where the 2nd " was */
864 }
865 kdb_grep_leading = 0;
866 if (*cp == '^') {
867 kdb_grep_leading = 1;
868 cp++;
869 }
870 len = strlen(cp);
871 kdb_grep_trailing = 0;
872 if (*(cp+len-1) == '$') {
873 kdb_grep_trailing = 1;
874 *(cp+len-1) = '\0';
875 }
876 len = strlen(cp);
877 if (!len)
878 return;
879 if (len >= KDB_GREP_STRLEN) {
880 kdb_printf("search string too long\n");
881 return;
882 }
883 strcpy(kdb_grep_string, cp);
884 kdb_grepping_flag++;
885 return;
886}
887
888/*
889 * kdb_parse - Parse the command line, search the command table for a
890 * matching command and invoke the command function. This
891 * function may be called recursively, if it is, the second call
892 * will overwrite argv and cbuf. It is the caller's
893 * responsibility to save their argv if they recursively call
894 * kdb_parse().
895 * Parameters:
896 * cmdstr The input command line to be parsed.
897 * regs The registers at the time kdb was entered.
898 * Returns:
899 * Zero for success, a kdb diagnostic if failure.
900 * Remarks:
901 * Limited to 20 tokens.
902 *
903 * Real rudimentary tokenization. Basically only whitespace
904 * is considered a token delimeter (but special consideration
905 * is taken of the '=' sign as used by the 'set' command).
906 *
907 * The algorithm used to tokenize the input string relies on
908 * there being at least one whitespace (or otherwise useless)
909 * character between tokens as the character immediately following
910 * the token is altered in-place to a null-byte to terminate the
911 * token string.
912 */
913
914#define MAXARGC 20
915
916int kdb_parse(const char *cmdstr)
917{
918 static char *argv[MAXARGC];
919 static int argc;
920 static char cbuf[CMD_BUFLEN+2];
921 char *cp;
922 char *cpp, quoted;
923 kdbtab_t *tp;
924 int i, escaped, ignore_errors = 0, check_grep = 0;
925
926 /*
927 * First tokenize the command string.
928 */
929 cp = (char *)cmdstr;
930
931 if (KDB_FLAG(CMD_INTERRUPT)) {
932 /* Previous command was interrupted, newline must not
933 * repeat the command */
934 KDB_FLAG_CLEAR(CMD_INTERRUPT);
935 KDB_STATE_SET(PAGER);
936 argc = 0; /* no repeat */
937 }
938
939 if (*cp != '\n' && *cp != '\0') {
940 argc = 0;
941 cpp = cbuf;
942 while (*cp) {
943 /* skip whitespace */
944 while (isspace(*cp))
945 cp++;
946 if ((*cp == '\0') || (*cp == '\n') ||
947 (*cp == '#' && !defcmd_in_progress))
948 break;
949 /* special case: check for | grep pattern */
950 if (*cp == '|') {
951 check_grep++;
952 break;
953 }
954 if (cpp >= cbuf + CMD_BUFLEN) {
955 kdb_printf("kdb_parse: command buffer "
956 "overflow, command ignored\n%s\n",
957 cmdstr);
958 return KDB_NOTFOUND;
959 }
960 if (argc >= MAXARGC - 1) {
961 kdb_printf("kdb_parse: too many arguments, "
962 "command ignored\n%s\n", cmdstr);
963 return KDB_NOTFOUND;
964 }
965 argv[argc++] = cpp;
966 escaped = 0;
967 quoted = '\0';
968 /* Copy to next unquoted and unescaped
969 * whitespace or '=' */
970 while (*cp && *cp != '\n' &&
971 (escaped || quoted || !isspace(*cp))) {
972 if (cpp >= cbuf + CMD_BUFLEN)
973 break;
974 if (escaped) {
975 escaped = 0;
976 *cpp++ = *cp++;
977 continue;
978 }
979 if (*cp == '\\') {
980 escaped = 1;
981 ++cp;
982 continue;
983 }
984 if (*cp == quoted)
985 quoted = '\0';
986 else if (*cp == '\'' || *cp == '"')
987 quoted = *cp;
988 *cpp = *cp++;
989 if (*cpp == '=' && !quoted)
990 break;
991 ++cpp;
992 }
993 *cpp++ = '\0'; /* Squash a ws or '=' character */
994 }
995 }
996 if (!argc)
997 return 0;
998 if (check_grep)
999 parse_grep(cp);
1000 if (defcmd_in_progress) {
1001 int result = kdb_defcmd2(cmdstr, argv[0]);
1002 if (!defcmd_in_progress) {
1003 argc = 0; /* avoid repeat on endefcmd */
1004 *(argv[0]) = '\0';
1005 }
1006 return result;
1007 }
1008 if (argv[0][0] == '-' && argv[0][1] &&
1009 (argv[0][1] < '0' || argv[0][1] > '9')) {
1010 ignore_errors = 1;
1011 ++argv[0];
1012 }
1013
1014 for_each_kdbcmd(tp, i) {
1015 if (tp->cmd_name) {
1016 /*
1017 * If this command is allowed to be abbreviated,
1018 * check to see if this is it.
1019 */
1020
1021 if (tp->cmd_minlen
1022 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1023 if (strncmp(argv[0],
1024 tp->cmd_name,
1025 tp->cmd_minlen) == 0) {
1026 break;
1027 }
1028 }
1029
1030 if (strcmp(argv[0], tp->cmd_name) == 0)
1031 break;
1032 }
1033 }
1034
1035 /*
1036 * If we don't find a command by this name, see if the first
1037 * few characters of this match any of the known commands.
1038 * e.g., md1c20 should match md.
1039 */
1040 if (i == kdb_max_commands) {
1041 for_each_kdbcmd(tp, i) {
1042 if (tp->cmd_name) {
1043 if (strncmp(argv[0],
1044 tp->cmd_name,
1045 strlen(tp->cmd_name)) == 0) {
1046 break;
1047 }
1048 }
1049 }
1050 }
1051
1052 if (i < kdb_max_commands) {
1053 int result;
1054
1055 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1056 return KDB_NOPERM;
1057
1058 KDB_STATE_SET(CMD);
1059 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1060 if (result && ignore_errors && result > KDB_CMD_GO)
1061 result = 0;
1062 KDB_STATE_CLEAR(CMD);
1063
1064 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1065 return result;
1066
1067 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1068 if (argv[argc])
1069 *(argv[argc]) = '\0';
1070 return result;
1071 }
1072
1073 /*
1074 * If the input with which we were presented does not
1075 * map to an existing command, attempt to parse it as an
1076 * address argument and display the result. Useful for
1077 * obtaining the address of a variable, or the nearest symbol
1078 * to an address contained in a register.
1079 */
1080 {
1081 unsigned long value;
1082 char *name = NULL;
1083 long offset;
1084 int nextarg = 0;
1085
1086 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1087 &value, &offset, &name)) {
1088 return KDB_NOTFOUND;
1089 }
1090
1091 kdb_printf("%s = ", argv[0]);
1092 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1093 kdb_printf("\n");
1094 return 0;
1095 }
1096}
1097
1098
1099static int handle_ctrl_cmd(char *cmd)
1100{
1101#define CTRL_P 16
1102#define CTRL_N 14
1103
1104 /* initial situation */
1105 if (cmd_head == cmd_tail)
1106 return 0;
1107 switch (*cmd) {
1108 case CTRL_P:
1109 if (cmdptr != cmd_tail)
1110 cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
1111 KDB_CMD_HISTORY_COUNT;
1112 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1113 return 1;
1114 case CTRL_N:
1115 if (cmdptr != cmd_head)
1116 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1117 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1118 return 1;
1119 }
1120 return 0;
1121}
1122
1123/*
1124 * kdb_reboot - This function implements the 'reboot' command. Reboot
1125 * the system immediately, or loop for ever on failure.
1126 */
1127static int kdb_reboot(int argc, const char **argv)
1128{
1129 emergency_restart();
1130 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1131 while (1)
1132 cpu_relax();
1133 /* NOTREACHED */
1134 return 0;
1135}
1136
1137static void kdb_dumpregs(struct pt_regs *regs)
1138{
1139 int old_lvl = console_loglevel;
1140 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1141 kdb_trap_printk++;
1142 show_regs(regs);
1143 kdb_trap_printk--;
1144 kdb_printf("\n");
1145 console_loglevel = old_lvl;
1146}
1147
1148static void kdb_set_current_task(struct task_struct *p)
1149{
1150 kdb_current_task = p;
1151
1152 if (kdb_task_has_cpu(p)) {
1153 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1154 return;
1155 }
1156 kdb_current_regs = NULL;
1157}
1158
1159static void drop_newline(char *buf)
1160{
1161 size_t len = strlen(buf);
1162
1163 if (len == 0)
1164 return;
1165 if (*(buf + len - 1) == '\n')
1166 *(buf + len - 1) = '\0';
1167}
1168
1169/*
1170 * kdb_local - The main code for kdb. This routine is invoked on a
1171 * specific processor, it is not global. The main kdb() routine
1172 * ensures that only one processor at a time is in this routine.
1173 * This code is called with the real reason code on the first
1174 * entry to a kdb session, thereafter it is called with reason
1175 * SWITCH, even if the user goes back to the original cpu.
1176 * Inputs:
1177 * reason The reason KDB was invoked
1178 * error The hardware-defined error code
1179 * regs The exception frame at time of fault/breakpoint.
1180 * db_result Result code from the break or debug point.
1181 * Returns:
1182 * 0 KDB was invoked for an event which it wasn't responsible
1183 * 1 KDB handled the event for which it was invoked.
1184 * KDB_CMD_GO User typed 'go'.
1185 * KDB_CMD_CPU User switched to another cpu.
1186 * KDB_CMD_SS Single step.
1187 */
1188static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1189 kdb_dbtrap_t db_result)
1190{
1191 char *cmdbuf;
1192 int diag;
1193 struct task_struct *kdb_current =
1194 kdb_curr_task(raw_smp_processor_id());
1195
1196 KDB_DEBUG_STATE("kdb_local 1", reason);
1197 kdb_go_count = 0;
1198 if (reason == KDB_REASON_DEBUG) {
1199 /* special case below */
1200 } else {
1201 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1202 kdb_current, kdb_current ? kdb_current->pid : 0);
1203#if defined(CONFIG_SMP)
1204 kdb_printf("on processor %d ", raw_smp_processor_id());
1205#endif
1206 }
1207
1208 switch (reason) {
1209 case KDB_REASON_DEBUG:
1210 {
1211 /*
1212 * If re-entering kdb after a single step
1213 * command, don't print the message.
1214 */
1215 switch (db_result) {
1216 case KDB_DB_BPT:
1217 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1218 kdb_current, kdb_current->pid);
1219#if defined(CONFIG_SMP)
1220 kdb_printf("on processor %d ", raw_smp_processor_id());
1221#endif
1222 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1223 instruction_pointer(regs));
1224 break;
1225 case KDB_DB_SS:
1226 break;
1227 case KDB_DB_SSBPT:
1228 KDB_DEBUG_STATE("kdb_local 4", reason);
1229 return 1; /* kdba_db_trap did the work */
1230 default:
1231 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1232 db_result);
1233 break;
1234 }
1235
1236 }
1237 break;
1238 case KDB_REASON_ENTER:
1239 if (KDB_STATE(KEYBOARD))
1240 kdb_printf("due to Keyboard Entry\n");
1241 else
1242 kdb_printf("due to KDB_ENTER()\n");
1243 break;
1244 case KDB_REASON_KEYBOARD:
1245 KDB_STATE_SET(KEYBOARD);
1246 kdb_printf("due to Keyboard Entry\n");
1247 break;
1248 case KDB_REASON_ENTER_SLAVE:
1249 /* drop through, slaves only get released via cpu switch */
1250 case KDB_REASON_SWITCH:
1251 kdb_printf("due to cpu switch\n");
1252 break;
1253 case KDB_REASON_OOPS:
1254 kdb_printf("Oops: %s\n", kdb_diemsg);
1255 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1256 instruction_pointer(regs));
1257 kdb_dumpregs(regs);
1258 break;
1259 case KDB_REASON_SYSTEM_NMI:
1260 kdb_printf("due to System NonMaskable Interrupt\n");
1261 break;
1262 case KDB_REASON_NMI:
1263 kdb_printf("due to NonMaskable Interrupt @ "
1264 kdb_machreg_fmt "\n",
1265 instruction_pointer(regs));
1266 break;
1267 case KDB_REASON_SSTEP:
1268 case KDB_REASON_BREAK:
1269 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1270 reason == KDB_REASON_BREAK ?
1271 "Breakpoint" : "SS trap", instruction_pointer(regs));
1272 /*
1273 * Determine if this breakpoint is one that we
1274 * are interested in.
1275 */
1276 if (db_result != KDB_DB_BPT) {
1277 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1278 db_result);
1279 KDB_DEBUG_STATE("kdb_local 6", reason);
1280 return 0; /* Not for us, dismiss it */
1281 }
1282 break;
1283 case KDB_REASON_RECURSE:
1284 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1285 instruction_pointer(regs));
1286 break;
1287 default:
1288 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1289 KDB_DEBUG_STATE("kdb_local 8", reason);
1290 return 0; /* Not for us, dismiss it */
1291 }
1292
1293 while (1) {
1294 /*
1295 * Initialize pager context.
1296 */
1297 kdb_nextline = 1;
1298 KDB_STATE_CLEAR(SUPPRESS);
1299 kdb_grepping_flag = 0;
1300 /* ensure the old search does not leak into '/' commands */
1301 kdb_grep_string[0] = '\0';
1302
1303 cmdbuf = cmd_cur;
1304 *cmdbuf = '\0';
1305 *(cmd_hist[cmd_head]) = '\0';
1306
1307do_full_getstr:
1308 /* PROMPT can only be set if we have MEM_READ permission. */
1309 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1310 raw_smp_processor_id());
1311 if (defcmd_in_progress)
1312 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1313
1314 /*
1315 * Fetch command from keyboard
1316 */
1317 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1318 if (*cmdbuf != '\n') {
1319 if (*cmdbuf < 32) {
1320 if (cmdptr == cmd_head) {
1321 strscpy(cmd_hist[cmd_head], cmd_cur,
1322 CMD_BUFLEN);
1323 *(cmd_hist[cmd_head] +
1324 strlen(cmd_hist[cmd_head])-1) = '\0';
1325 }
1326 if (!handle_ctrl_cmd(cmdbuf))
1327 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1328 cmdbuf = cmd_cur;
1329 goto do_full_getstr;
1330 } else {
1331 strscpy(cmd_hist[cmd_head], cmd_cur,
1332 CMD_BUFLEN);
1333 }
1334
1335 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1336 if (cmd_head == cmd_tail)
1337 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1338 }
1339
1340 cmdptr = cmd_head;
1341 diag = kdb_parse(cmdbuf);
1342 if (diag == KDB_NOTFOUND) {
1343 drop_newline(cmdbuf);
1344 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1345 diag = 0;
1346 }
1347 if (diag == KDB_CMD_GO
1348 || diag == KDB_CMD_CPU
1349 || diag == KDB_CMD_SS
1350 || diag == KDB_CMD_KGDB)
1351 break;
1352
1353 if (diag)
1354 kdb_cmderror(diag);
1355 }
1356 KDB_DEBUG_STATE("kdb_local 9", diag);
1357 return diag;
1358}
1359
1360
1361/*
1362 * kdb_print_state - Print the state data for the current processor
1363 * for debugging.
1364 * Inputs:
1365 * text Identifies the debug point
1366 * value Any integer value to be printed, e.g. reason code.
1367 */
1368void kdb_print_state(const char *text, int value)
1369{
1370 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1371 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1372 kdb_state);
1373}
1374
1375/*
1376 * kdb_main_loop - After initial setup and assignment of the
1377 * controlling cpu, all cpus are in this loop. One cpu is in
1378 * control and will issue the kdb prompt, the others will spin
1379 * until 'go' or cpu switch.
1380 *
1381 * To get a consistent view of the kernel stacks for all
1382 * processes, this routine is invoked from the main kdb code via
1383 * an architecture specific routine. kdba_main_loop is
1384 * responsible for making the kernel stacks consistent for all
1385 * processes, there should be no difference between a blocked
1386 * process and a running process as far as kdb is concerned.
1387 * Inputs:
1388 * reason The reason KDB was invoked
1389 * error The hardware-defined error code
1390 * reason2 kdb's current reason code.
1391 * Initially error but can change
1392 * according to kdb state.
1393 * db_result Result code from break or debug point.
1394 * regs The exception frame at time of fault/breakpoint.
1395 * should always be valid.
1396 * Returns:
1397 * 0 KDB was invoked for an event which it wasn't responsible
1398 * 1 KDB handled the event for which it was invoked.
1399 */
1400int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1401 kdb_dbtrap_t db_result, struct pt_regs *regs)
1402{
1403 int result = 1;
1404 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1405 while (1) {
1406 /*
1407 * All processors except the one that is in control
1408 * will spin here.
1409 */
1410 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1411 while (KDB_STATE(HOLD_CPU)) {
1412 /* state KDB is turned off by kdb_cpu to see if the
1413 * other cpus are still live, each cpu in this loop
1414 * turns it back on.
1415 */
1416 if (!KDB_STATE(KDB))
1417 KDB_STATE_SET(KDB);
1418 }
1419
1420 KDB_STATE_CLEAR(SUPPRESS);
1421 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1422 if (KDB_STATE(LEAVING))
1423 break; /* Another cpu said 'go' */
1424 /* Still using kdb, this processor is in control */
1425 result = kdb_local(reason2, error, regs, db_result);
1426 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1427
1428 if (result == KDB_CMD_CPU)
1429 break;
1430
1431 if (result == KDB_CMD_SS) {
1432 KDB_STATE_SET(DOING_SS);
1433 break;
1434 }
1435
1436 if (result == KDB_CMD_KGDB) {
1437 if (!KDB_STATE(DOING_KGDB))
1438 kdb_printf("Entering please attach debugger "
1439 "or use $D#44+ or $3#33\n");
1440 break;
1441 }
1442 if (result && result != 1 && result != KDB_CMD_GO)
1443 kdb_printf("\nUnexpected kdb_local return code %d\n",
1444 result);
1445 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1446 break;
1447 }
1448 if (KDB_STATE(DOING_SS))
1449 KDB_STATE_CLEAR(SSBPT);
1450
1451 /* Clean up any keyboard devices before leaving */
1452 kdb_kbd_cleanup_state();
1453
1454 return result;
1455}
1456
1457/*
1458 * kdb_mdr - This function implements the guts of the 'mdr', memory
1459 * read command.
1460 * mdr <addr arg>,<byte count>
1461 * Inputs:
1462 * addr Start address
1463 * count Number of bytes
1464 * Returns:
1465 * Always 0. Any errors are detected and printed by kdb_getarea.
1466 */
1467static int kdb_mdr(unsigned long addr, unsigned int count)
1468{
1469 unsigned char c;
1470 while (count--) {
1471 if (kdb_getarea(c, addr))
1472 return 0;
1473 kdb_printf("%02x", c);
1474 addr++;
1475 }
1476 kdb_printf("\n");
1477 return 0;
1478}
1479
1480/*
1481 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1482 * 'md8' 'mdr' and 'mds' commands.
1483 *
1484 * md|mds [<addr arg> [<line count> [<radix>]]]
1485 * mdWcN [<addr arg> [<line count> [<radix>]]]
1486 * where W = is the width (1, 2, 4 or 8) and N is the count.
1487 * for eg., md1c20 reads 20 bytes, 1 at a time.
1488 * mdr <addr arg>,<byte count>
1489 */
1490static void kdb_md_line(const char *fmtstr, unsigned long addr,
1491 int symbolic, int nosect, int bytesperword,
1492 int num, int repeat, int phys)
1493{
1494 /* print just one line of data */
1495 kdb_symtab_t symtab;
1496 char cbuf[32];
1497 char *c = cbuf;
1498 int i;
1499 int j;
1500 unsigned long word;
1501
1502 memset(cbuf, '\0', sizeof(cbuf));
1503 if (phys)
1504 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1505 else
1506 kdb_printf(kdb_machreg_fmt0 " ", addr);
1507
1508 for (i = 0; i < num && repeat--; i++) {
1509 if (phys) {
1510 if (kdb_getphysword(&word, addr, bytesperword))
1511 break;
1512 } else if (kdb_getword(&word, addr, bytesperword))
1513 break;
1514 kdb_printf(fmtstr, word);
1515 if (symbolic)
1516 kdbnearsym(word, &symtab);
1517 else
1518 memset(&symtab, 0, sizeof(symtab));
1519 if (symtab.sym_name) {
1520 kdb_symbol_print(word, &symtab, 0);
1521 if (!nosect) {
1522 kdb_printf("\n");
1523 kdb_printf(" %s %s "
1524 kdb_machreg_fmt " "
1525 kdb_machreg_fmt " "
1526 kdb_machreg_fmt, symtab.mod_name,
1527 symtab.sec_name, symtab.sec_start,
1528 symtab.sym_start, symtab.sym_end);
1529 }
1530 addr += bytesperword;
1531 } else {
1532 union {
1533 u64 word;
1534 unsigned char c[8];
1535 } wc;
1536 unsigned char *cp;
1537#ifdef __BIG_ENDIAN
1538 cp = wc.c + 8 - bytesperword;
1539#else
1540 cp = wc.c;
1541#endif
1542 wc.word = word;
1543#define printable_char(c) \
1544 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1545 for (j = 0; j < bytesperword; j++)
1546 *c++ = printable_char(*cp++);
1547 addr += bytesperword;
1548#undef printable_char
1549 }
1550 }
1551 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1552 " ", cbuf);
1553}
1554
1555static int kdb_md(int argc, const char **argv)
1556{
1557 static unsigned long last_addr;
1558 static int last_radix, last_bytesperword, last_repeat;
1559 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1560 int nosect = 0;
1561 char fmtchar, fmtstr[64];
1562 unsigned long addr;
1563 unsigned long word;
1564 long offset = 0;
1565 int symbolic = 0;
1566 int valid = 0;
1567 int phys = 0;
1568 int raw = 0;
1569
1570 kdbgetintenv("MDCOUNT", &mdcount);
1571 kdbgetintenv("RADIX", &radix);
1572 kdbgetintenv("BYTESPERWORD", &bytesperword);
1573
1574 /* Assume 'md <addr>' and start with environment values */
1575 repeat = mdcount * 16 / bytesperword;
1576
1577 if (strcmp(argv[0], "mdr") == 0) {
1578 if (argc == 2 || (argc == 0 && last_addr != 0))
1579 valid = raw = 1;
1580 else
1581 return KDB_ARGCOUNT;
1582 } else if (isdigit(argv[0][2])) {
1583 bytesperword = (int)(argv[0][2] - '0');
1584 if (bytesperword == 0) {
1585 bytesperword = last_bytesperword;
1586 if (bytesperword == 0)
1587 bytesperword = 4;
1588 }
1589 last_bytesperword = bytesperword;
1590 repeat = mdcount * 16 / bytesperword;
1591 if (!argv[0][3])
1592 valid = 1;
1593 else if (argv[0][3] == 'c' && argv[0][4]) {
1594 char *p;
1595 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1596 mdcount = ((repeat * bytesperword) + 15) / 16;
1597 valid = !*p;
1598 }
1599 last_repeat = repeat;
1600 } else if (strcmp(argv[0], "md") == 0)
1601 valid = 1;
1602 else if (strcmp(argv[0], "mds") == 0)
1603 valid = 1;
1604 else if (strcmp(argv[0], "mdp") == 0) {
1605 phys = valid = 1;
1606 }
1607 if (!valid)
1608 return KDB_NOTFOUND;
1609
1610 if (argc == 0) {
1611 if (last_addr == 0)
1612 return KDB_ARGCOUNT;
1613 addr = last_addr;
1614 radix = last_radix;
1615 bytesperword = last_bytesperword;
1616 repeat = last_repeat;
1617 if (raw)
1618 mdcount = repeat;
1619 else
1620 mdcount = ((repeat * bytesperword) + 15) / 16;
1621 }
1622
1623 if (argc) {
1624 unsigned long val;
1625 int diag, nextarg = 1;
1626 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1627 &offset, NULL);
1628 if (diag)
1629 return diag;
1630 if (argc > nextarg+2)
1631 return KDB_ARGCOUNT;
1632
1633 if (argc >= nextarg) {
1634 diag = kdbgetularg(argv[nextarg], &val);
1635 if (!diag) {
1636 mdcount = (int) val;
1637 if (raw)
1638 repeat = mdcount;
1639 else
1640 repeat = mdcount * 16 / bytesperword;
1641 }
1642 }
1643 if (argc >= nextarg+1) {
1644 diag = kdbgetularg(argv[nextarg+1], &val);
1645 if (!diag)
1646 radix = (int) val;
1647 }
1648 }
1649
1650 if (strcmp(argv[0], "mdr") == 0) {
1651 int ret;
1652 last_addr = addr;
1653 ret = kdb_mdr(addr, mdcount);
1654 last_addr += mdcount;
1655 last_repeat = mdcount;
1656 last_bytesperword = bytesperword; // to make REPEAT happy
1657 return ret;
1658 }
1659
1660 switch (radix) {
1661 case 10:
1662 fmtchar = 'd';
1663 break;
1664 case 16:
1665 fmtchar = 'x';
1666 break;
1667 case 8:
1668 fmtchar = 'o';
1669 break;
1670 default:
1671 return KDB_BADRADIX;
1672 }
1673
1674 last_radix = radix;
1675
1676 if (bytesperword > KDB_WORD_SIZE)
1677 return KDB_BADWIDTH;
1678
1679 switch (bytesperword) {
1680 case 8:
1681 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1682 break;
1683 case 4:
1684 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1685 break;
1686 case 2:
1687 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1688 break;
1689 case 1:
1690 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1691 break;
1692 default:
1693 return KDB_BADWIDTH;
1694 }
1695
1696 last_repeat = repeat;
1697 last_bytesperword = bytesperword;
1698
1699 if (strcmp(argv[0], "mds") == 0) {
1700 symbolic = 1;
1701 /* Do not save these changes as last_*, they are temporary mds
1702 * overrides.
1703 */
1704 bytesperword = KDB_WORD_SIZE;
1705 repeat = mdcount;
1706 kdbgetintenv("NOSECT", &nosect);
1707 }
1708
1709 /* Round address down modulo BYTESPERWORD */
1710
1711 addr &= ~(bytesperword-1);
1712
1713 while (repeat > 0) {
1714 unsigned long a;
1715 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1716
1717 if (KDB_FLAG(CMD_INTERRUPT))
1718 return 0;
1719 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1720 if (phys) {
1721 if (kdb_getphysword(&word, a, bytesperword)
1722 || word)
1723 break;
1724 } else if (kdb_getword(&word, a, bytesperword) || word)
1725 break;
1726 }
1727 n = min(num, repeat);
1728 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1729 num, repeat, phys);
1730 addr += bytesperword * n;
1731 repeat -= n;
1732 z = (z + num - 1) / num;
1733 if (z > 2) {
1734 int s = num * (z-2);
1735 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1736 " zero suppressed\n",
1737 addr, addr + bytesperword * s - 1);
1738 addr += bytesperword * s;
1739 repeat -= s;
1740 }
1741 }
1742 last_addr = addr;
1743
1744 return 0;
1745}
1746
1747/*
1748 * kdb_mm - This function implements the 'mm' command.
1749 * mm address-expression new-value
1750 * Remarks:
1751 * mm works on machine words, mmW works on bytes.
1752 */
1753static int kdb_mm(int argc, const char **argv)
1754{
1755 int diag;
1756 unsigned long addr;
1757 long offset = 0;
1758 unsigned long contents;
1759 int nextarg;
1760 int width;
1761
1762 if (argv[0][2] && !isdigit(argv[0][2]))
1763 return KDB_NOTFOUND;
1764
1765 if (argc < 2)
1766 return KDB_ARGCOUNT;
1767
1768 nextarg = 1;
1769 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1770 if (diag)
1771 return diag;
1772
1773 if (nextarg > argc)
1774 return KDB_ARGCOUNT;
1775 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1776 if (diag)
1777 return diag;
1778
1779 if (nextarg != argc + 1)
1780 return KDB_ARGCOUNT;
1781
1782 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1783 diag = kdb_putword(addr, contents, width);
1784 if (diag)
1785 return diag;
1786
1787 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1788
1789 return 0;
1790}
1791
1792/*
1793 * kdb_go - This function implements the 'go' command.
1794 * go [address-expression]
1795 */
1796static int kdb_go(int argc, const char **argv)
1797{
1798 unsigned long addr;
1799 int diag;
1800 int nextarg;
1801 long offset;
1802
1803 if (raw_smp_processor_id() != kdb_initial_cpu) {
1804 kdb_printf("go must execute on the entry cpu, "
1805 "please use \"cpu %d\" and then execute go\n",
1806 kdb_initial_cpu);
1807 return KDB_BADCPUNUM;
1808 }
1809 if (argc == 1) {
1810 nextarg = 1;
1811 diag = kdbgetaddrarg(argc, argv, &nextarg,
1812 &addr, &offset, NULL);
1813 if (diag)
1814 return diag;
1815 } else if (argc) {
1816 return KDB_ARGCOUNT;
1817 }
1818
1819 diag = KDB_CMD_GO;
1820 if (KDB_FLAG(CATASTROPHIC)) {
1821 kdb_printf("Catastrophic error detected\n");
1822 kdb_printf("kdb_continue_catastrophic=%d, ",
1823 kdb_continue_catastrophic);
1824 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1825 kdb_printf("type go a second time if you really want "
1826 "to continue\n");
1827 return 0;
1828 }
1829 if (kdb_continue_catastrophic == 2) {
1830 kdb_printf("forcing reboot\n");
1831 kdb_reboot(0, NULL);
1832 }
1833 kdb_printf("attempting to continue\n");
1834 }
1835 return diag;
1836}
1837
1838/*
1839 * kdb_rd - This function implements the 'rd' command.
1840 */
1841static int kdb_rd(int argc, const char **argv)
1842{
1843 int len = kdb_check_regs();
1844#if DBG_MAX_REG_NUM > 0
1845 int i;
1846 char *rname;
1847 int rsize;
1848 u64 reg64;
1849 u32 reg32;
1850 u16 reg16;
1851 u8 reg8;
1852
1853 if (len)
1854 return len;
1855
1856 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1857 rsize = dbg_reg_def[i].size * 2;
1858 if (rsize > 16)
1859 rsize = 2;
1860 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1861 len = 0;
1862 kdb_printf("\n");
1863 }
1864 if (len)
1865 len += kdb_printf(" ");
1866 switch(dbg_reg_def[i].size * 8) {
1867 case 8:
1868 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1869 if (!rname)
1870 break;
1871 len += kdb_printf("%s: %02x", rname, reg8);
1872 break;
1873 case 16:
1874 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1875 if (!rname)
1876 break;
1877 len += kdb_printf("%s: %04x", rname, reg16);
1878 break;
1879 case 32:
1880 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1881 if (!rname)
1882 break;
1883 len += kdb_printf("%s: %08x", rname, reg32);
1884 break;
1885 case 64:
1886 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1887 if (!rname)
1888 break;
1889 len += kdb_printf("%s: %016llx", rname, reg64);
1890 break;
1891 default:
1892 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1893 }
1894 }
1895 kdb_printf("\n");
1896#else
1897 if (len)
1898 return len;
1899
1900 kdb_dumpregs(kdb_current_regs);
1901#endif
1902 return 0;
1903}
1904
1905/*
1906 * kdb_rm - This function implements the 'rm' (register modify) command.
1907 * rm register-name new-contents
1908 * Remarks:
1909 * Allows register modification with the same restrictions as gdb
1910 */
1911static int kdb_rm(int argc, const char **argv)
1912{
1913#if DBG_MAX_REG_NUM > 0
1914 int diag;
1915 const char *rname;
1916 int i;
1917 u64 reg64;
1918 u32 reg32;
1919 u16 reg16;
1920 u8 reg8;
1921
1922 if (argc != 2)
1923 return KDB_ARGCOUNT;
1924 /*
1925 * Allow presence or absence of leading '%' symbol.
1926 */
1927 rname = argv[1];
1928 if (*rname == '%')
1929 rname++;
1930
1931 diag = kdbgetu64arg(argv[2], ®64);
1932 if (diag)
1933 return diag;
1934
1935 diag = kdb_check_regs();
1936 if (diag)
1937 return diag;
1938
1939 diag = KDB_BADREG;
1940 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1941 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1942 diag = 0;
1943 break;
1944 }
1945 }
1946 if (!diag) {
1947 switch(dbg_reg_def[i].size * 8) {
1948 case 8:
1949 reg8 = reg64;
1950 dbg_set_reg(i, ®8, kdb_current_regs);
1951 break;
1952 case 16:
1953 reg16 = reg64;
1954 dbg_set_reg(i, ®16, kdb_current_regs);
1955 break;
1956 case 32:
1957 reg32 = reg64;
1958 dbg_set_reg(i, ®32, kdb_current_regs);
1959 break;
1960 case 64:
1961 dbg_set_reg(i, ®64, kdb_current_regs);
1962 break;
1963 }
1964 }
1965 return diag;
1966#else
1967 kdb_printf("ERROR: Register set currently not implemented\n");
1968 return 0;
1969#endif
1970}
1971
1972#if defined(CONFIG_MAGIC_SYSRQ)
1973/*
1974 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1975 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1976 * sr <magic-sysrq-code>
1977 */
1978static int kdb_sr(int argc, const char **argv)
1979{
1980 bool check_mask =
1981 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1982
1983 if (argc != 1)
1984 return KDB_ARGCOUNT;
1985
1986 kdb_trap_printk++;
1987 __handle_sysrq(*argv[1], check_mask);
1988 kdb_trap_printk--;
1989
1990 return 0;
1991}
1992#endif /* CONFIG_MAGIC_SYSRQ */
1993
1994/*
1995 * kdb_ef - This function implements the 'regs' (display exception
1996 * frame) command. This command takes an address and expects to
1997 * find an exception frame at that address, formats and prints
1998 * it.
1999 * regs address-expression
2000 * Remarks:
2001 * Not done yet.
2002 */
2003static int kdb_ef(int argc, const char **argv)
2004{
2005 int diag;
2006 unsigned long addr;
2007 long offset;
2008 int nextarg;
2009
2010 if (argc != 1)
2011 return KDB_ARGCOUNT;
2012
2013 nextarg = 1;
2014 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2015 if (diag)
2016 return diag;
2017 show_regs((struct pt_regs *)addr);
2018 return 0;
2019}
2020
2021#if defined(CONFIG_MODULES)
2022/*
2023 * kdb_lsmod - This function implements the 'lsmod' command. Lists
2024 * currently loaded kernel modules.
2025 * Mostly taken from userland lsmod.
2026 */
2027static int kdb_lsmod(int argc, const char **argv)
2028{
2029 struct module *mod;
2030
2031 if (argc != 0)
2032 return KDB_ARGCOUNT;
2033
2034 kdb_printf("Module Size modstruct Used by\n");
2035 list_for_each_entry(mod, kdb_modules, list) {
2036 if (mod->state == MODULE_STATE_UNFORMED)
2037 continue;
2038
2039 kdb_printf("%-20s%8u 0x%px ", mod->name,
2040 mod->core_layout.size, (void *)mod);
2041#ifdef CONFIG_MODULE_UNLOAD
2042 kdb_printf("%4d ", module_refcount(mod));
2043#endif
2044 if (mod->state == MODULE_STATE_GOING)
2045 kdb_printf(" (Unloading)");
2046 else if (mod->state == MODULE_STATE_COMING)
2047 kdb_printf(" (Loading)");
2048 else
2049 kdb_printf(" (Live)");
2050 kdb_printf(" 0x%px", mod->core_layout.base);
2051
2052#ifdef CONFIG_MODULE_UNLOAD
2053 {
2054 struct module_use *use;
2055 kdb_printf(" [ ");
2056 list_for_each_entry(use, &mod->source_list,
2057 source_list)
2058 kdb_printf("%s ", use->target->name);
2059 kdb_printf("]\n");
2060 }
2061#endif
2062 }
2063
2064 return 0;
2065}
2066
2067#endif /* CONFIG_MODULES */
2068
2069/*
2070 * kdb_env - This function implements the 'env' command. Display the
2071 * current environment variables.
2072 */
2073
2074static int kdb_env(int argc, const char **argv)
2075{
2076 int i;
2077
2078 for (i = 0; i < __nenv; i++) {
2079 if (__env[i])
2080 kdb_printf("%s\n", __env[i]);
2081 }
2082
2083 if (KDB_DEBUG(MASK))
2084 kdb_printf("KDBDEBUG=0x%x\n",
2085 (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
2086
2087 return 0;
2088}
2089
2090#ifdef CONFIG_PRINTK
2091/*
2092 * kdb_dmesg - This function implements the 'dmesg' command to display
2093 * the contents of the syslog buffer.
2094 * dmesg [lines] [adjust]
2095 */
2096static int kdb_dmesg(int argc, const char **argv)
2097{
2098 int diag;
2099 int logging;
2100 int lines = 0;
2101 int adjust = 0;
2102 int n = 0;
2103 int skip = 0;
2104 struct kmsg_dumper dumper = { .active = 1 };
2105 size_t len;
2106 char buf[201];
2107
2108 if (argc > 2)
2109 return KDB_ARGCOUNT;
2110 if (argc) {
2111 char *cp;
2112 lines = simple_strtol(argv[1], &cp, 0);
2113 if (*cp)
2114 lines = 0;
2115 if (argc > 1) {
2116 adjust = simple_strtoul(argv[2], &cp, 0);
2117 if (*cp || adjust < 0)
2118 adjust = 0;
2119 }
2120 }
2121
2122 /* disable LOGGING if set */
2123 diag = kdbgetintenv("LOGGING", &logging);
2124 if (!diag && logging) {
2125 const char *setargs[] = { "set", "LOGGING", "0" };
2126 kdb_set(2, setargs);
2127 }
2128
2129 kmsg_dump_rewind_nolock(&dumper);
2130 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2131 n++;
2132
2133 if (lines < 0) {
2134 if (adjust >= n)
2135 kdb_printf("buffer only contains %d lines, nothing "
2136 "printed\n", n);
2137 else if (adjust - lines >= n)
2138 kdb_printf("buffer only contains %d lines, last %d "
2139 "lines printed\n", n, n - adjust);
2140 skip = adjust;
2141 lines = abs(lines);
2142 } else if (lines > 0) {
2143 skip = n - lines - adjust;
2144 lines = abs(lines);
2145 if (adjust >= n) {
2146 kdb_printf("buffer only contains %d lines, "
2147 "nothing printed\n", n);
2148 skip = n;
2149 } else if (skip < 0) {
2150 lines += skip;
2151 skip = 0;
2152 kdb_printf("buffer only contains %d lines, first "
2153 "%d lines printed\n", n, lines);
2154 }
2155 } else {
2156 lines = n;
2157 }
2158
2159 if (skip >= n || skip < 0)
2160 return 0;
2161
2162 kmsg_dump_rewind_nolock(&dumper);
2163 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2164 if (skip) {
2165 skip--;
2166 continue;
2167 }
2168 if (!lines--)
2169 break;
2170 if (KDB_FLAG(CMD_INTERRUPT))
2171 return 0;
2172
2173 kdb_printf("%.*s\n", (int)len - 1, buf);
2174 }
2175
2176 return 0;
2177}
2178#endif /* CONFIG_PRINTK */
2179
2180/* Make sure we balance enable/disable calls, must disable first. */
2181static atomic_t kdb_nmi_disabled;
2182
2183static int kdb_disable_nmi(int argc, const char *argv[])
2184{
2185 if (atomic_read(&kdb_nmi_disabled))
2186 return 0;
2187 atomic_set(&kdb_nmi_disabled, 1);
2188 arch_kgdb_ops.enable_nmi(0);
2189 return 0;
2190}
2191
2192static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2193{
2194 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2195 return -EINVAL;
2196 arch_kgdb_ops.enable_nmi(1);
2197 return 0;
2198}
2199
2200static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2201 .set = kdb_param_enable_nmi,
2202};
2203module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2204
2205/*
2206 * kdb_cpu - This function implements the 'cpu' command.
2207 * cpu [<cpunum>]
2208 * Returns:
2209 * KDB_CMD_CPU for success, a kdb diagnostic if error
2210 */
2211static void kdb_cpu_status(void)
2212{
2213 int i, start_cpu, first_print = 1;
2214 char state, prev_state = '?';
2215
2216 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2217 kdb_printf("Available cpus: ");
2218 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2219 if (!cpu_online(i)) {
2220 state = 'F'; /* cpu is offline */
2221 } else if (!kgdb_info[i].enter_kgdb) {
2222 state = 'D'; /* cpu is online but unresponsive */
2223 } else {
2224 state = ' '; /* cpu is responding to kdb */
2225 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2226 state = 'I'; /* idle task */
2227 }
2228 if (state != prev_state) {
2229 if (prev_state != '?') {
2230 if (!first_print)
2231 kdb_printf(", ");
2232 first_print = 0;
2233 kdb_printf("%d", start_cpu);
2234 if (start_cpu < i-1)
2235 kdb_printf("-%d", i-1);
2236 if (prev_state != ' ')
2237 kdb_printf("(%c)", prev_state);
2238 }
2239 prev_state = state;
2240 start_cpu = i;
2241 }
2242 }
2243 /* print the trailing cpus, ignoring them if they are all offline */
2244 if (prev_state != 'F') {
2245 if (!first_print)
2246 kdb_printf(", ");
2247 kdb_printf("%d", start_cpu);
2248 if (start_cpu < i-1)
2249 kdb_printf("-%d", i-1);
2250 if (prev_state != ' ')
2251 kdb_printf("(%c)", prev_state);
2252 }
2253 kdb_printf("\n");
2254}
2255
2256static int kdb_cpu(int argc, const char **argv)
2257{
2258 unsigned long cpunum;
2259 int diag;
2260
2261 if (argc == 0) {
2262 kdb_cpu_status();
2263 return 0;
2264 }
2265
2266 if (argc != 1)
2267 return KDB_ARGCOUNT;
2268
2269 diag = kdbgetularg(argv[1], &cpunum);
2270 if (diag)
2271 return diag;
2272
2273 /*
2274 * Validate cpunum
2275 */
2276 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2277 return KDB_BADCPUNUM;
2278
2279 dbg_switch_cpu = cpunum;
2280
2281 /*
2282 * Switch to other cpu
2283 */
2284 return KDB_CMD_CPU;
2285}
2286
2287/* The user may not realize that ps/bta with no parameters does not print idle
2288 * or sleeping system daemon processes, so tell them how many were suppressed.
2289 */
2290void kdb_ps_suppressed(void)
2291{
2292 int idle = 0, daemon = 0;
2293 unsigned long mask_I = kdb_task_state_string("I"),
2294 mask_M = kdb_task_state_string("M");
2295 unsigned long cpu;
2296 const struct task_struct *p, *g;
2297 for_each_online_cpu(cpu) {
2298 p = kdb_curr_task(cpu);
2299 if (kdb_task_state(p, mask_I))
2300 ++idle;
2301 }
2302 kdb_do_each_thread(g, p) {
2303 if (kdb_task_state(p, mask_M))
2304 ++daemon;
2305 } kdb_while_each_thread(g, p);
2306 if (idle || daemon) {
2307 if (idle)
2308 kdb_printf("%d idle process%s (state I)%s\n",
2309 idle, idle == 1 ? "" : "es",
2310 daemon ? " and " : "");
2311 if (daemon)
2312 kdb_printf("%d sleeping system daemon (state M) "
2313 "process%s", daemon,
2314 daemon == 1 ? "" : "es");
2315 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2316 }
2317}
2318
2319/*
2320 * kdb_ps - This function implements the 'ps' command which shows a
2321 * list of the active processes.
2322 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2323 */
2324void kdb_ps1(const struct task_struct *p)
2325{
2326 int cpu;
2327 unsigned long tmp;
2328
2329 if (!p ||
2330 copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
2331 return;
2332
2333 cpu = kdb_process_cpu(p);
2334 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2335 (void *)p, p->pid, p->parent->pid,
2336 kdb_task_has_cpu(p), kdb_process_cpu(p),
2337 kdb_task_state_char(p),
2338 (void *)(&p->thread),
2339 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2340 p->comm);
2341 if (kdb_task_has_cpu(p)) {
2342 if (!KDB_TSK(cpu)) {
2343 kdb_printf(" Error: no saved data for this cpu\n");
2344 } else {
2345 if (KDB_TSK(cpu) != p)
2346 kdb_printf(" Error: does not match running "
2347 "process table (0x%px)\n", KDB_TSK(cpu));
2348 }
2349 }
2350}
2351
2352static int kdb_ps(int argc, const char **argv)
2353{
2354 struct task_struct *g, *p;
2355 unsigned long mask, cpu;
2356
2357 if (argc == 0)
2358 kdb_ps_suppressed();
2359 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2360 (int)(2*sizeof(void *))+2, "Task Addr",
2361 (int)(2*sizeof(void *))+2, "Thread");
2362 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2363 /* Run the active tasks first */
2364 for_each_online_cpu(cpu) {
2365 if (KDB_FLAG(CMD_INTERRUPT))
2366 return 0;
2367 p = kdb_curr_task(cpu);
2368 if (kdb_task_state(p, mask))
2369 kdb_ps1(p);
2370 }
2371 kdb_printf("\n");
2372 /* Now the real tasks */
2373 kdb_do_each_thread(g, p) {
2374 if (KDB_FLAG(CMD_INTERRUPT))
2375 return 0;
2376 if (kdb_task_state(p, mask))
2377 kdb_ps1(p);
2378 } kdb_while_each_thread(g, p);
2379
2380 return 0;
2381}
2382
2383/*
2384 * kdb_pid - This function implements the 'pid' command which switches
2385 * the currently active process.
2386 * pid [<pid> | R]
2387 */
2388static int kdb_pid(int argc, const char **argv)
2389{
2390 struct task_struct *p;
2391 unsigned long val;
2392 int diag;
2393
2394 if (argc > 1)
2395 return KDB_ARGCOUNT;
2396
2397 if (argc) {
2398 if (strcmp(argv[1], "R") == 0) {
2399 p = KDB_TSK(kdb_initial_cpu);
2400 } else {
2401 diag = kdbgetularg(argv[1], &val);
2402 if (diag)
2403 return KDB_BADINT;
2404
2405 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2406 if (!p) {
2407 kdb_printf("No task with pid=%d\n", (pid_t)val);
2408 return 0;
2409 }
2410 }
2411 kdb_set_current_task(p);
2412 }
2413 kdb_printf("KDB current process is %s(pid=%d)\n",
2414 kdb_current_task->comm,
2415 kdb_current_task->pid);
2416
2417 return 0;
2418}
2419
2420static int kdb_kgdb(int argc, const char **argv)
2421{
2422 return KDB_CMD_KGDB;
2423}
2424
2425/*
2426 * kdb_help - This function implements the 'help' and '?' commands.
2427 */
2428static int kdb_help(int argc, const char **argv)
2429{
2430 kdbtab_t *kt;
2431 int i;
2432
2433 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2434 kdb_printf("-----------------------------"
2435 "-----------------------------\n");
2436 for_each_kdbcmd(kt, i) {
2437 char *space = "";
2438 if (KDB_FLAG(CMD_INTERRUPT))
2439 return 0;
2440 if (!kt->cmd_name)
2441 continue;
2442 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2443 continue;
2444 if (strlen(kt->cmd_usage) > 20)
2445 space = "\n ";
2446 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2447 kt->cmd_usage, space, kt->cmd_help);
2448 }
2449 return 0;
2450}
2451
2452/*
2453 * kdb_kill - This function implements the 'kill' commands.
2454 */
2455static int kdb_kill(int argc, const char **argv)
2456{
2457 long sig, pid;
2458 char *endp;
2459 struct task_struct *p;
2460
2461 if (argc != 2)
2462 return KDB_ARGCOUNT;
2463
2464 sig = simple_strtol(argv[1], &endp, 0);
2465 if (*endp)
2466 return KDB_BADINT;
2467 if ((sig >= 0) || !valid_signal(-sig)) {
2468 kdb_printf("Invalid signal parameter.<-signal>\n");
2469 return 0;
2470 }
2471 sig = -sig;
2472
2473 pid = simple_strtol(argv[2], &endp, 0);
2474 if (*endp)
2475 return KDB_BADINT;
2476 if (pid <= 0) {
2477 kdb_printf("Process ID must be large than 0.\n");
2478 return 0;
2479 }
2480
2481 /* Find the process. */
2482 p = find_task_by_pid_ns(pid, &init_pid_ns);
2483 if (!p) {
2484 kdb_printf("The specified process isn't found.\n");
2485 return 0;
2486 }
2487 p = p->group_leader;
2488 kdb_send_sig(p, sig);
2489 return 0;
2490}
2491
2492/*
2493 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2494 * I cannot call that code directly from kdb, it has an unconditional
2495 * cli()/sti() and calls routines that take locks which can stop the debugger.
2496 */
2497static void kdb_sysinfo(struct sysinfo *val)
2498{
2499 u64 uptime = ktime_get_mono_fast_ns();
2500
2501 memset(val, 0, sizeof(*val));
2502 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2503 val->loads[0] = avenrun[0];
2504 val->loads[1] = avenrun[1];
2505 val->loads[2] = avenrun[2];
2506 val->procs = nr_threads-1;
2507 si_meminfo(val);
2508
2509 return;
2510}
2511
2512/*
2513 * kdb_summary - This function implements the 'summary' command.
2514 */
2515static int kdb_summary(int argc, const char **argv)
2516{
2517 time64_t now;
2518 struct tm tm;
2519 struct sysinfo val;
2520
2521 if (argc)
2522 return KDB_ARGCOUNT;
2523
2524 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2525 kdb_printf("release %s\n", init_uts_ns.name.release);
2526 kdb_printf("version %s\n", init_uts_ns.name.version);
2527 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2528 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2529 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2530
2531 now = __ktime_get_real_seconds();
2532 time64_to_tm(now, 0, &tm);
2533 kdb_printf("date %04ld-%02d-%02d %02d:%02d:%02d "
2534 "tz_minuteswest %d\n",
2535 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2536 tm.tm_hour, tm.tm_min, tm.tm_sec,
2537 sys_tz.tz_minuteswest);
2538
2539 kdb_sysinfo(&val);
2540 kdb_printf("uptime ");
2541 if (val.uptime > (24*60*60)) {
2542 int days = val.uptime / (24*60*60);
2543 val.uptime %= (24*60*60);
2544 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2545 }
2546 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2547
2548 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2549 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2550 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2551 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2552
2553 /* Display in kilobytes */
2554#define K(x) ((x) << (PAGE_SHIFT - 10))
2555 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2556 "Buffers: %8lu kB\n",
2557 K(val.totalram), K(val.freeram), K(val.bufferram));
2558 return 0;
2559}
2560
2561/*
2562 * kdb_per_cpu - This function implements the 'per_cpu' command.
2563 */
2564static int kdb_per_cpu(int argc, const char **argv)
2565{
2566 char fmtstr[64];
2567 int cpu, diag, nextarg = 1;
2568 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2569
2570 if (argc < 1 || argc > 3)
2571 return KDB_ARGCOUNT;
2572
2573 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2574 if (diag)
2575 return diag;
2576
2577 if (argc >= 2) {
2578 diag = kdbgetularg(argv[2], &bytesperword);
2579 if (diag)
2580 return diag;
2581 }
2582 if (!bytesperword)
2583 bytesperword = KDB_WORD_SIZE;
2584 else if (bytesperword > KDB_WORD_SIZE)
2585 return KDB_BADWIDTH;
2586 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2587 if (argc >= 3) {
2588 diag = kdbgetularg(argv[3], &whichcpu);
2589 if (diag)
2590 return diag;
2591 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2592 kdb_printf("cpu %ld is not online\n", whichcpu);
2593 return KDB_BADCPUNUM;
2594 }
2595 }
2596
2597 /* Most architectures use __per_cpu_offset[cpu], some use
2598 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2599 */
2600#ifdef __per_cpu_offset
2601#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2602#else
2603#ifdef CONFIG_SMP
2604#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2605#else
2606#define KDB_PCU(cpu) 0
2607#endif
2608#endif
2609 for_each_online_cpu(cpu) {
2610 if (KDB_FLAG(CMD_INTERRUPT))
2611 return 0;
2612
2613 if (whichcpu != ~0UL && whichcpu != cpu)
2614 continue;
2615 addr = symaddr + KDB_PCU(cpu);
2616 diag = kdb_getword(&val, addr, bytesperword);
2617 if (diag) {
2618 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2619 "read, diag=%d\n", cpu, addr, diag);
2620 continue;
2621 }
2622 kdb_printf("%5d ", cpu);
2623 kdb_md_line(fmtstr, addr,
2624 bytesperword == KDB_WORD_SIZE,
2625 1, bytesperword, 1, 1, 0);
2626 }
2627#undef KDB_PCU
2628 return 0;
2629}
2630
2631/*
2632 * display help for the use of cmd | grep pattern
2633 */
2634static int kdb_grep_help(int argc, const char **argv)
2635{
2636 kdb_printf("Usage of cmd args | grep pattern:\n");
2637 kdb_printf(" Any command's output may be filtered through an ");
2638 kdb_printf("emulated 'pipe'.\n");
2639 kdb_printf(" 'grep' is just a key word.\n");
2640 kdb_printf(" The pattern may include a very limited set of "
2641 "metacharacters:\n");
2642 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2643 kdb_printf(" And if there are spaces in the pattern, you may "
2644 "quote it:\n");
2645 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2646 " or \"^pat tern$\"\n");
2647 return 0;
2648}
2649
2650/*
2651 * kdb_register_flags - This function is used to register a kernel
2652 * debugger command.
2653 * Inputs:
2654 * cmd Command name
2655 * func Function to execute the command
2656 * usage A simple usage string showing arguments
2657 * help A simple help string describing command
2658 * repeat Does the command auto repeat on enter?
2659 * Returns:
2660 * zero for success, one if a duplicate command.
2661 */
2662#define kdb_command_extend 50 /* arbitrary */
2663int kdb_register_flags(char *cmd,
2664 kdb_func_t func,
2665 char *usage,
2666 char *help,
2667 short minlen,
2668 kdb_cmdflags_t flags)
2669{
2670 int i;
2671 kdbtab_t *kp;
2672
2673 /*
2674 * Brute force method to determine duplicates
2675 */
2676 for_each_kdbcmd(kp, i) {
2677 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2678 kdb_printf("Duplicate kdb command registered: "
2679 "%s, func %px help %s\n", cmd, func, help);
2680 return 1;
2681 }
2682 }
2683
2684 /*
2685 * Insert command into first available location in table
2686 */
2687 for_each_kdbcmd(kp, i) {
2688 if (kp->cmd_name == NULL)
2689 break;
2690 }
2691
2692 if (i >= kdb_max_commands) {
2693 kdbtab_t *new = kmalloc_array(kdb_max_commands -
2694 KDB_BASE_CMD_MAX +
2695 kdb_command_extend,
2696 sizeof(*new),
2697 GFP_KDB);
2698 if (!new) {
2699 kdb_printf("Could not allocate new kdb_command "
2700 "table\n");
2701 return 1;
2702 }
2703 if (kdb_commands) {
2704 memcpy(new, kdb_commands,
2705 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2706 kfree(kdb_commands);
2707 }
2708 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2709 kdb_command_extend * sizeof(*new));
2710 kdb_commands = new;
2711 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2712 kdb_max_commands += kdb_command_extend;
2713 }
2714
2715 kp->cmd_name = cmd;
2716 kp->cmd_func = func;
2717 kp->cmd_usage = usage;
2718 kp->cmd_help = help;
2719 kp->cmd_minlen = minlen;
2720 kp->cmd_flags = flags;
2721
2722 return 0;
2723}
2724EXPORT_SYMBOL_GPL(kdb_register_flags);
2725
2726
2727/*
2728 * kdb_register - Compatibility register function for commands that do
2729 * not need to specify a repeat state. Equivalent to
2730 * kdb_register_flags with flags set to 0.
2731 * Inputs:
2732 * cmd Command name
2733 * func Function to execute the command
2734 * usage A simple usage string showing arguments
2735 * help A simple help string describing command
2736 * Returns:
2737 * zero for success, one if a duplicate command.
2738 */
2739int kdb_register(char *cmd,
2740 kdb_func_t func,
2741 char *usage,
2742 char *help,
2743 short minlen)
2744{
2745 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2746}
2747EXPORT_SYMBOL_GPL(kdb_register);
2748
2749/*
2750 * kdb_unregister - This function is used to unregister a kernel
2751 * debugger command. It is generally called when a module which
2752 * implements kdb commands is unloaded.
2753 * Inputs:
2754 * cmd Command name
2755 * Returns:
2756 * zero for success, one command not registered.
2757 */
2758int kdb_unregister(char *cmd)
2759{
2760 int i;
2761 kdbtab_t *kp;
2762
2763 /*
2764 * find the command.
2765 */
2766 for_each_kdbcmd(kp, i) {
2767 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2768 kp->cmd_name = NULL;
2769 return 0;
2770 }
2771 }
2772
2773 /* Couldn't find it. */
2774 return 1;
2775}
2776EXPORT_SYMBOL_GPL(kdb_unregister);
2777
2778/* Initialize the kdb command table. */
2779static void __init kdb_inittab(void)
2780{
2781 int i;
2782 kdbtab_t *kp;
2783
2784 for_each_kdbcmd(kp, i)
2785 kp->cmd_name = NULL;
2786
2787 kdb_register_flags("md", kdb_md, "<vaddr>",
2788 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2789 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2790 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2791 "Display Raw Memory", 0,
2792 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2793 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2794 "Display Physical Memory", 0,
2795 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2796 kdb_register_flags("mds", kdb_md, "<vaddr>",
2797 "Display Memory Symbolically", 0,
2798 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2799 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2800 "Modify Memory Contents", 0,
2801 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2802 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2803 "Continue Execution", 1,
2804 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2805 kdb_register_flags("rd", kdb_rd, "",
2806 "Display Registers", 0,
2807 KDB_ENABLE_REG_READ);
2808 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2809 "Modify Registers", 0,
2810 KDB_ENABLE_REG_WRITE);
2811 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2812 "Display exception frame", 0,
2813 KDB_ENABLE_MEM_READ);
2814 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2815 "Stack traceback", 1,
2816 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2817 kdb_register_flags("btp", kdb_bt, "<pid>",
2818 "Display stack for process <pid>", 0,
2819 KDB_ENABLE_INSPECT);
2820 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2821 "Backtrace all processes matching state flag", 0,
2822 KDB_ENABLE_INSPECT);
2823 kdb_register_flags("btc", kdb_bt, "",
2824 "Backtrace current process on each cpu", 0,
2825 KDB_ENABLE_INSPECT);
2826 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2827 "Backtrace process given its struct task address", 0,
2828 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2829 kdb_register_flags("env", kdb_env, "",
2830 "Show environment variables", 0,
2831 KDB_ENABLE_ALWAYS_SAFE);
2832 kdb_register_flags("set", kdb_set, "",
2833 "Set environment variables", 0,
2834 KDB_ENABLE_ALWAYS_SAFE);
2835 kdb_register_flags("help", kdb_help, "",
2836 "Display Help Message", 1,
2837 KDB_ENABLE_ALWAYS_SAFE);
2838 kdb_register_flags("?", kdb_help, "",
2839 "Display Help Message", 0,
2840 KDB_ENABLE_ALWAYS_SAFE);
2841 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2842 "Switch to new cpu", 0,
2843 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2844 kdb_register_flags("kgdb", kdb_kgdb, "",
2845 "Enter kgdb mode", 0, 0);
2846 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2847 "Display active task list", 0,
2848 KDB_ENABLE_INSPECT);
2849 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2850 "Switch to another task", 0,
2851 KDB_ENABLE_INSPECT);
2852 kdb_register_flags("reboot", kdb_reboot, "",
2853 "Reboot the machine immediately", 0,
2854 KDB_ENABLE_REBOOT);
2855#if defined(CONFIG_MODULES)
2856 kdb_register_flags("lsmod", kdb_lsmod, "",
2857 "List loaded kernel modules", 0,
2858 KDB_ENABLE_INSPECT);
2859#endif
2860#if defined(CONFIG_MAGIC_SYSRQ)
2861 kdb_register_flags("sr", kdb_sr, "<key>",
2862 "Magic SysRq key", 0,
2863 KDB_ENABLE_ALWAYS_SAFE);
2864#endif
2865#if defined(CONFIG_PRINTK)
2866 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2867 "Display syslog buffer", 0,
2868 KDB_ENABLE_ALWAYS_SAFE);
2869#endif
2870 if (arch_kgdb_ops.enable_nmi) {
2871 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2872 "Disable NMI entry to KDB", 0,
2873 KDB_ENABLE_ALWAYS_SAFE);
2874 }
2875 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2876 "Define a set of commands, down to endefcmd", 0,
2877 KDB_ENABLE_ALWAYS_SAFE);
2878 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2879 "Send a signal to a process", 0,
2880 KDB_ENABLE_SIGNAL);
2881 kdb_register_flags("summary", kdb_summary, "",
2882 "Summarize the system", 4,
2883 KDB_ENABLE_ALWAYS_SAFE);
2884 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2885 "Display per_cpu variables", 3,
2886 KDB_ENABLE_MEM_READ);
2887 kdb_register_flags("grephelp", kdb_grep_help, "",
2888 "Display help on | grep", 0,
2889 KDB_ENABLE_ALWAYS_SAFE);
2890}
2891
2892/* Execute any commands defined in kdb_cmds. */
2893static void __init kdb_cmd_init(void)
2894{
2895 int i, diag;
2896 for (i = 0; kdb_cmds[i]; ++i) {
2897 diag = kdb_parse(kdb_cmds[i]);
2898 if (diag)
2899 kdb_printf("kdb command %s failed, kdb diag %d\n",
2900 kdb_cmds[i], diag);
2901 }
2902 if (defcmd_in_progress) {
2903 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2904 kdb_parse("endefcmd");
2905 }
2906}
2907
2908/* Initialize kdb_printf, breakpoint tables and kdb state */
2909void __init kdb_init(int lvl)
2910{
2911 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2912 int i;
2913
2914 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2915 return;
2916 for (i = kdb_init_lvl; i < lvl; i++) {
2917 switch (i) {
2918 case KDB_NOT_INITIALIZED:
2919 kdb_inittab(); /* Initialize Command Table */
2920 kdb_initbptab(); /* Initialize Breakpoints */
2921 break;
2922 case KDB_INIT_EARLY:
2923 kdb_cmd_init(); /* Build kdb_cmds tables */
2924 break;
2925 }
2926 }
2927 kdb_init_lvl = lvl;
2928}