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1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sched/loadavg.h>
22#include <linux/sched/stat.h>
23#include <linux/sched/debug.h>
24#include <linux/sysrq.h>
25#include <linux/smp.h>
26#include <linux/utsname.h>
27#include <linux/vmalloc.h>
28#include <linux/atomic.h>
29#include <linux/moduleparam.h>
30#include <linux/mm.h>
31#include <linux/init.h>
32#include <linux/kallsyms.h>
33#include <linux/kgdb.h>
34#include <linux/kdb.h>
35#include <linux/notifier.h>
36#include <linux/interrupt.h>
37#include <linux/delay.h>
38#include <linux/nmi.h>
39#include <linux/time.h>
40#include <linux/ptrace.h>
41#include <linux/sysctl.h>
42#include <linux/cpu.h>
43#include <linux/kdebug.h>
44#include <linux/proc_fs.h>
45#include <linux/uaccess.h>
46#include <linux/slab.h>
47#include <linux/security.h>
48#include "kdb_private.h"
49
50#undef MODULE_PARAM_PREFIX
51#define MODULE_PARAM_PREFIX "kdb."
52
53static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
54module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
55
56char kdb_grep_string[KDB_GREP_STRLEN];
57int kdb_grepping_flag;
58EXPORT_SYMBOL(kdb_grepping_flag);
59int kdb_grep_leading;
60int kdb_grep_trailing;
61
62/*
63 * Kernel debugger state flags
64 */
65unsigned int kdb_flags;
66
67/*
68 * kdb_lock protects updates to kdb_initial_cpu. Used to
69 * single thread processors through the kernel debugger.
70 */
71int kdb_initial_cpu = -1; /* cpu number that owns kdb */
72int kdb_nextline = 1;
73int kdb_state; /* General KDB state */
74
75struct task_struct *kdb_current_task;
76struct pt_regs *kdb_current_regs;
77
78const char *kdb_diemsg;
79static int kdb_go_count;
80#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
81static unsigned int kdb_continue_catastrophic =
82 CONFIG_KDB_CONTINUE_CATASTROPHIC;
83#else
84static unsigned int kdb_continue_catastrophic;
85#endif
86
87/* kdb_cmds_head describes the available commands. */
88static LIST_HEAD(kdb_cmds_head);
89
90typedef struct _kdbmsg {
91 int km_diag; /* kdb diagnostic */
92 char *km_msg; /* Corresponding message text */
93} kdbmsg_t;
94
95#define KDBMSG(msgnum, text) \
96 { KDB_##msgnum, text }
97
98static kdbmsg_t kdbmsgs[] = {
99 KDBMSG(NOTFOUND, "Command Not Found"),
100 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
101 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
102 "8 is only allowed on 64 bit systems"),
103 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
104 KDBMSG(NOTENV, "Cannot find environment variable"),
105 KDBMSG(NOENVVALUE, "Environment variable should have value"),
106 KDBMSG(NOTIMP, "Command not implemented"),
107 KDBMSG(ENVFULL, "Environment full"),
108 KDBMSG(ENVBUFFULL, "Environment buffer full"),
109 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
110#ifdef CONFIG_CPU_XSCALE
111 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
112#else
113 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
114#endif
115 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
116 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
117 KDBMSG(BADMODE, "Invalid IDMODE"),
118 KDBMSG(BADINT, "Illegal numeric value"),
119 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
120 KDBMSG(BADREG, "Invalid register name"),
121 KDBMSG(BADCPUNUM, "Invalid cpu number"),
122 KDBMSG(BADLENGTH, "Invalid length field"),
123 KDBMSG(NOBP, "No Breakpoint exists"),
124 KDBMSG(BADADDR, "Invalid address"),
125 KDBMSG(NOPERM, "Permission denied"),
126};
127#undef KDBMSG
128
129static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
130
131
132/*
133 * Initial environment. This is all kept static and local to
134 * this file. We don't want to rely on the memory allocation
135 * mechanisms in the kernel, so we use a very limited allocate-only
136 * heap for new and altered environment variables. The entire
137 * environment is limited to a fixed number of entries (add more
138 * to __env[] if required) and a fixed amount of heap (add more to
139 * KDB_ENVBUFSIZE if required).
140 */
141
142static char *__env[31] = {
143#if defined(CONFIG_SMP)
144 "PROMPT=[%d]kdb> ",
145#else
146 "PROMPT=kdb> ",
147#endif
148 "MOREPROMPT=more> ",
149 "RADIX=16",
150 "MDCOUNT=8", /* lines of md output */
151 KDB_PLATFORM_ENV,
152 "DTABCOUNT=30",
153 "NOSECT=1",
154};
155
156static const int __nenv = ARRAY_SIZE(__env);
157
158struct task_struct *kdb_curr_task(int cpu)
159{
160 struct task_struct *p = curr_task(cpu);
161#ifdef _TIF_MCA_INIT
162 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
163 p = krp->p;
164#endif
165 return p;
166}
167
168/*
169 * Update the permissions flags (kdb_cmd_enabled) to match the
170 * current lockdown state.
171 *
172 * Within this function the calls to security_locked_down() are "lazy". We
173 * avoid calling them if the current value of kdb_cmd_enabled already excludes
174 * flags that might be subject to lockdown. Additionally we deliberately check
175 * the lockdown flags independently (even though read lockdown implies write
176 * lockdown) since that results in both simpler code and clearer messages to
177 * the user on first-time debugger entry.
178 *
179 * The permission masks during a read+write lockdown permits the following
180 * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE).
181 *
182 * The INSPECT commands are not blocked during lockdown because they are
183 * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes
184 * forcing them to have no arguments) and lsmod. These commands do expose
185 * some kernel state but do not allow the developer seated at the console to
186 * choose what state is reported. SIGNAL and REBOOT should not be controversial,
187 * given these are allowed for root during lockdown already.
188 */
189static void kdb_check_for_lockdown(void)
190{
191 const int write_flags = KDB_ENABLE_MEM_WRITE |
192 KDB_ENABLE_REG_WRITE |
193 KDB_ENABLE_FLOW_CTRL;
194 const int read_flags = KDB_ENABLE_MEM_READ |
195 KDB_ENABLE_REG_READ;
196
197 bool need_to_lockdown_write = false;
198 bool need_to_lockdown_read = false;
199
200 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags))
201 need_to_lockdown_write =
202 security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL);
203
204 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags))
205 need_to_lockdown_read =
206 security_locked_down(LOCKDOWN_DBG_READ_KERNEL);
207
208 /* De-compose KDB_ENABLE_ALL if required */
209 if (need_to_lockdown_write || need_to_lockdown_read)
210 if (kdb_cmd_enabled & KDB_ENABLE_ALL)
211 kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL;
212
213 if (need_to_lockdown_write)
214 kdb_cmd_enabled &= ~write_flags;
215
216 if (need_to_lockdown_read)
217 kdb_cmd_enabled &= ~read_flags;
218}
219
220/*
221 * Check whether the flags of the current command, the permissions of the kdb
222 * console and the lockdown state allow a command to be run.
223 */
224static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
225 bool no_args)
226{
227 /* permissions comes from userspace so needs massaging slightly */
228 permissions &= KDB_ENABLE_MASK;
229 permissions |= KDB_ENABLE_ALWAYS_SAFE;
230
231 /* some commands change group when launched with no arguments */
232 if (no_args)
233 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
234
235 flags |= KDB_ENABLE_ALL;
236
237 return permissions & flags;
238}
239
240/*
241 * kdbgetenv - This function will return the character string value of
242 * an environment variable.
243 * Parameters:
244 * match A character string representing an environment variable.
245 * Returns:
246 * NULL No environment variable matches 'match'
247 * char* Pointer to string value of environment variable.
248 */
249char *kdbgetenv(const char *match)
250{
251 char **ep = __env;
252 int matchlen = strlen(match);
253 int i;
254
255 for (i = 0; i < __nenv; i++) {
256 char *e = *ep++;
257
258 if (!e)
259 continue;
260
261 if ((strncmp(match, e, matchlen) == 0)
262 && ((e[matchlen] == '\0')
263 || (e[matchlen] == '='))) {
264 char *cp = strchr(e, '=');
265 return cp ? ++cp : "";
266 }
267 }
268 return NULL;
269}
270
271/*
272 * kdballocenv - This function is used to allocate bytes for
273 * environment entries.
274 * Parameters:
275 * match A character string representing a numeric value
276 * Outputs:
277 * *value the unsigned long representation of the env variable 'match'
278 * Returns:
279 * Zero on success, a kdb diagnostic on failure.
280 * Remarks:
281 * We use a static environment buffer (envbuffer) to hold the values
282 * of dynamically generated environment variables (see kdb_set). Buffer
283 * space once allocated is never free'd, so over time, the amount of space
284 * (currently 512 bytes) will be exhausted if env variables are changed
285 * frequently.
286 */
287static char *kdballocenv(size_t bytes)
288{
289#define KDB_ENVBUFSIZE 512
290 static char envbuffer[KDB_ENVBUFSIZE];
291 static int envbufsize;
292 char *ep = NULL;
293
294 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
295 ep = &envbuffer[envbufsize];
296 envbufsize += bytes;
297 }
298 return ep;
299}
300
301/*
302 * kdbgetulenv - This function will return the value of an unsigned
303 * long-valued environment variable.
304 * Parameters:
305 * match A character string representing a numeric value
306 * Outputs:
307 * *value the unsigned long representation of the env variable 'match'
308 * Returns:
309 * Zero on success, a kdb diagnostic on failure.
310 */
311static int kdbgetulenv(const char *match, unsigned long *value)
312{
313 char *ep;
314
315 ep = kdbgetenv(match);
316 if (!ep)
317 return KDB_NOTENV;
318 if (strlen(ep) == 0)
319 return KDB_NOENVVALUE;
320
321 *value = simple_strtoul(ep, NULL, 0);
322
323 return 0;
324}
325
326/*
327 * kdbgetintenv - This function will return the value of an
328 * integer-valued environment variable.
329 * Parameters:
330 * match A character string representing an integer-valued env variable
331 * Outputs:
332 * *value the integer representation of the environment variable 'match'
333 * Returns:
334 * Zero on success, a kdb diagnostic on failure.
335 */
336int kdbgetintenv(const char *match, int *value)
337{
338 unsigned long val;
339 int diag;
340
341 diag = kdbgetulenv(match, &val);
342 if (!diag)
343 *value = (int) val;
344 return diag;
345}
346
347/*
348 * kdb_setenv() - Alter an existing environment variable or create a new one.
349 * @var: Name of the variable
350 * @val: Value of the variable
351 *
352 * Return: Zero on success, a kdb diagnostic on failure.
353 */
354static int kdb_setenv(const char *var, const char *val)
355{
356 int i;
357 char *ep;
358 size_t varlen, vallen;
359
360 varlen = strlen(var);
361 vallen = strlen(val);
362 ep = kdballocenv(varlen + vallen + 2);
363 if (ep == (char *)0)
364 return KDB_ENVBUFFULL;
365
366 sprintf(ep, "%s=%s", var, val);
367
368 for (i = 0; i < __nenv; i++) {
369 if (__env[i]
370 && ((strncmp(__env[i], var, varlen) == 0)
371 && ((__env[i][varlen] == '\0')
372 || (__env[i][varlen] == '=')))) {
373 __env[i] = ep;
374 return 0;
375 }
376 }
377
378 /*
379 * Wasn't existing variable. Fit into slot.
380 */
381 for (i = 0; i < __nenv-1; i++) {
382 if (__env[i] == (char *)0) {
383 __env[i] = ep;
384 return 0;
385 }
386 }
387
388 return KDB_ENVFULL;
389}
390
391/*
392 * kdb_printenv() - Display the current environment variables.
393 */
394static void kdb_printenv(void)
395{
396 int i;
397
398 for (i = 0; i < __nenv; i++) {
399 if (__env[i])
400 kdb_printf("%s\n", __env[i]);
401 }
402}
403
404/*
405 * kdbgetularg - This function will convert a numeric string into an
406 * unsigned long value.
407 * Parameters:
408 * arg A character string representing a numeric value
409 * Outputs:
410 * *value the unsigned long representation of arg.
411 * Returns:
412 * Zero on success, a kdb diagnostic on failure.
413 */
414int kdbgetularg(const char *arg, unsigned long *value)
415{
416 char *endp;
417 unsigned long val;
418
419 val = simple_strtoul(arg, &endp, 0);
420
421 if (endp == arg) {
422 /*
423 * Also try base 16, for us folks too lazy to type the
424 * leading 0x...
425 */
426 val = simple_strtoul(arg, &endp, 16);
427 if (endp == arg)
428 return KDB_BADINT;
429 }
430
431 *value = val;
432
433 return 0;
434}
435
436int kdbgetu64arg(const char *arg, u64 *value)
437{
438 char *endp;
439 u64 val;
440
441 val = simple_strtoull(arg, &endp, 0);
442
443 if (endp == arg) {
444
445 val = simple_strtoull(arg, &endp, 16);
446 if (endp == arg)
447 return KDB_BADINT;
448 }
449
450 *value = val;
451
452 return 0;
453}
454
455/*
456 * kdb_set - This function implements the 'set' command. Alter an
457 * existing environment variable or create a new one.
458 */
459int kdb_set(int argc, const char **argv)
460{
461 /*
462 * we can be invoked two ways:
463 * set var=value argv[1]="var", argv[2]="value"
464 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
465 * - if the latter, shift 'em down.
466 */
467 if (argc == 3) {
468 argv[2] = argv[3];
469 argc--;
470 }
471
472 if (argc != 2)
473 return KDB_ARGCOUNT;
474
475 /*
476 * Censor sensitive variables
477 */
478 if (strcmp(argv[1], "PROMPT") == 0 &&
479 !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
480 return KDB_NOPERM;
481
482 /*
483 * Check for internal variables
484 */
485 if (strcmp(argv[1], "KDBDEBUG") == 0) {
486 unsigned int debugflags;
487 char *cp;
488
489 debugflags = simple_strtoul(argv[2], &cp, 0);
490 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
491 kdb_printf("kdb: illegal debug flags '%s'\n",
492 argv[2]);
493 return 0;
494 }
495 kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK))
496 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
497
498 return 0;
499 }
500
501 /*
502 * Tokenizer squashed the '=' sign. argv[1] is variable
503 * name, argv[2] = value.
504 */
505 return kdb_setenv(argv[1], argv[2]);
506}
507
508static int kdb_check_regs(void)
509{
510 if (!kdb_current_regs) {
511 kdb_printf("No current kdb registers."
512 " You may need to select another task\n");
513 return KDB_BADREG;
514 }
515 return 0;
516}
517
518/*
519 * kdbgetaddrarg - This function is responsible for parsing an
520 * address-expression and returning the value of the expression,
521 * symbol name, and offset to the caller.
522 *
523 * The argument may consist of a numeric value (decimal or
524 * hexadecimal), a symbol name, a register name (preceded by the
525 * percent sign), an environment variable with a numeric value
526 * (preceded by a dollar sign) or a simple arithmetic expression
527 * consisting of a symbol name, +/-, and a numeric constant value
528 * (offset).
529 * Parameters:
530 * argc - count of arguments in argv
531 * argv - argument vector
532 * *nextarg - index to next unparsed argument in argv[]
533 * regs - Register state at time of KDB entry
534 * Outputs:
535 * *value - receives the value of the address-expression
536 * *offset - receives the offset specified, if any
537 * *name - receives the symbol name, if any
538 * *nextarg - index to next unparsed argument in argv[]
539 * Returns:
540 * zero is returned on success, a kdb diagnostic code is
541 * returned on error.
542 */
543int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
544 unsigned long *value, long *offset,
545 char **name)
546{
547 unsigned long addr;
548 unsigned long off = 0;
549 int positive;
550 int diag;
551 int found = 0;
552 char *symname;
553 char symbol = '\0';
554 char *cp;
555 kdb_symtab_t symtab;
556
557 /*
558 * If the enable flags prohibit both arbitrary memory access
559 * and flow control then there are no reasonable grounds to
560 * provide symbol lookup.
561 */
562 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
563 kdb_cmd_enabled, false))
564 return KDB_NOPERM;
565
566 /*
567 * Process arguments which follow the following syntax:
568 *
569 * symbol | numeric-address [+/- numeric-offset]
570 * %register
571 * $environment-variable
572 */
573
574 if (*nextarg > argc)
575 return KDB_ARGCOUNT;
576
577 symname = (char *)argv[*nextarg];
578
579 /*
580 * If there is no whitespace between the symbol
581 * or address and the '+' or '-' symbols, we
582 * remember the character and replace it with a
583 * null so the symbol/value can be properly parsed
584 */
585 cp = strpbrk(symname, "+-");
586 if (cp != NULL) {
587 symbol = *cp;
588 *cp++ = '\0';
589 }
590
591 if (symname[0] == '$') {
592 diag = kdbgetulenv(&symname[1], &addr);
593 if (diag)
594 return diag;
595 } else if (symname[0] == '%') {
596 diag = kdb_check_regs();
597 if (diag)
598 return diag;
599 /* Implement register values with % at a later time as it is
600 * arch optional.
601 */
602 return KDB_NOTIMP;
603 } else {
604 found = kdbgetsymval(symname, &symtab);
605 if (found) {
606 addr = symtab.sym_start;
607 } else {
608 diag = kdbgetularg(argv[*nextarg], &addr);
609 if (diag)
610 return diag;
611 }
612 }
613
614 if (!found)
615 found = kdbnearsym(addr, &symtab);
616
617 (*nextarg)++;
618
619 if (name)
620 *name = symname;
621 if (value)
622 *value = addr;
623 if (offset && name && *name)
624 *offset = addr - symtab.sym_start;
625
626 if ((*nextarg > argc)
627 && (symbol == '\0'))
628 return 0;
629
630 /*
631 * check for +/- and offset
632 */
633
634 if (symbol == '\0') {
635 if ((argv[*nextarg][0] != '+')
636 && (argv[*nextarg][0] != '-')) {
637 /*
638 * Not our argument. Return.
639 */
640 return 0;
641 } else {
642 positive = (argv[*nextarg][0] == '+');
643 (*nextarg)++;
644 }
645 } else
646 positive = (symbol == '+');
647
648 /*
649 * Now there must be an offset!
650 */
651 if ((*nextarg > argc)
652 && (symbol == '\0')) {
653 return KDB_INVADDRFMT;
654 }
655
656 if (!symbol) {
657 cp = (char *)argv[*nextarg];
658 (*nextarg)++;
659 }
660
661 diag = kdbgetularg(cp, &off);
662 if (diag)
663 return diag;
664
665 if (!positive)
666 off = -off;
667
668 if (offset)
669 *offset += off;
670
671 if (value)
672 *value += off;
673
674 return 0;
675}
676
677static void kdb_cmderror(int diag)
678{
679 int i;
680
681 if (diag >= 0) {
682 kdb_printf("no error detected (diagnostic is %d)\n", diag);
683 return;
684 }
685
686 for (i = 0; i < __nkdb_err; i++) {
687 if (kdbmsgs[i].km_diag == diag) {
688 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
689 return;
690 }
691 }
692
693 kdb_printf("Unknown diag %d\n", -diag);
694}
695
696/*
697 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
698 * command which defines one command as a set of other commands,
699 * terminated by endefcmd. kdb_defcmd processes the initial
700 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
701 * the following commands until 'endefcmd'.
702 * Inputs:
703 * argc argument count
704 * argv argument vector
705 * Returns:
706 * zero for success, a kdb diagnostic if error
707 */
708struct kdb_macro {
709 kdbtab_t cmd; /* Macro command */
710 struct list_head statements; /* Associated statement list */
711};
712
713struct kdb_macro_statement {
714 char *statement; /* Statement text */
715 struct list_head list_node; /* Statement list node */
716};
717
718static struct kdb_macro *kdb_macro;
719static bool defcmd_in_progress;
720
721/* Forward references */
722static int kdb_exec_defcmd(int argc, const char **argv);
723
724static int kdb_defcmd2(const char *cmdstr, const char *argv0)
725{
726 struct kdb_macro_statement *kms;
727
728 if (!kdb_macro)
729 return KDB_NOTIMP;
730
731 if (strcmp(argv0, "endefcmd") == 0) {
732 defcmd_in_progress = false;
733 if (!list_empty(&kdb_macro->statements))
734 kdb_register(&kdb_macro->cmd);
735 return 0;
736 }
737
738 kms = kmalloc(sizeof(*kms), GFP_KDB);
739 if (!kms) {
740 kdb_printf("Could not allocate new kdb macro command: %s\n",
741 cmdstr);
742 return KDB_NOTIMP;
743 }
744
745 kms->statement = kdb_strdup(cmdstr, GFP_KDB);
746 list_add_tail(&kms->list_node, &kdb_macro->statements);
747
748 return 0;
749}
750
751static int kdb_defcmd(int argc, const char **argv)
752{
753 kdbtab_t *mp;
754
755 if (defcmd_in_progress) {
756 kdb_printf("kdb: nested defcmd detected, assuming missing "
757 "endefcmd\n");
758 kdb_defcmd2("endefcmd", "endefcmd");
759 }
760 if (argc == 0) {
761 kdbtab_t *kp;
762 struct kdb_macro *kmp;
763 struct kdb_macro_statement *kms;
764
765 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
766 if (kp->func == kdb_exec_defcmd) {
767 kdb_printf("defcmd %s \"%s\" \"%s\"\n",
768 kp->name, kp->usage, kp->help);
769 kmp = container_of(kp, struct kdb_macro, cmd);
770 list_for_each_entry(kms, &kmp->statements,
771 list_node)
772 kdb_printf("%s", kms->statement);
773 kdb_printf("endefcmd\n");
774 }
775 }
776 return 0;
777 }
778 if (argc != 3)
779 return KDB_ARGCOUNT;
780 if (in_dbg_master()) {
781 kdb_printf("Command only available during kdb_init()\n");
782 return KDB_NOTIMP;
783 }
784 kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
785 if (!kdb_macro)
786 goto fail_defcmd;
787
788 mp = &kdb_macro->cmd;
789 mp->func = kdb_exec_defcmd;
790 mp->minlen = 0;
791 mp->flags = KDB_ENABLE_ALWAYS_SAFE;
792 mp->name = kdb_strdup(argv[1], GFP_KDB);
793 if (!mp->name)
794 goto fail_name;
795 mp->usage = kdb_strdup(argv[2], GFP_KDB);
796 if (!mp->usage)
797 goto fail_usage;
798 mp->help = kdb_strdup(argv[3], GFP_KDB);
799 if (!mp->help)
800 goto fail_help;
801 if (mp->usage[0] == '"') {
802 strcpy(mp->usage, argv[2]+1);
803 mp->usage[strlen(mp->usage)-1] = '\0';
804 }
805 if (mp->help[0] == '"') {
806 strcpy(mp->help, argv[3]+1);
807 mp->help[strlen(mp->help)-1] = '\0';
808 }
809
810 INIT_LIST_HEAD(&kdb_macro->statements);
811 defcmd_in_progress = true;
812 return 0;
813fail_help:
814 kfree(mp->usage);
815fail_usage:
816 kfree(mp->name);
817fail_name:
818 kfree(kdb_macro);
819fail_defcmd:
820 kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
821 return KDB_NOTIMP;
822}
823
824/*
825 * kdb_exec_defcmd - Execute the set of commands associated with this
826 * defcmd name.
827 * Inputs:
828 * argc argument count
829 * argv argument vector
830 * Returns:
831 * zero for success, a kdb diagnostic if error
832 */
833static int kdb_exec_defcmd(int argc, const char **argv)
834{
835 int ret;
836 kdbtab_t *kp;
837 struct kdb_macro *kmp;
838 struct kdb_macro_statement *kms;
839
840 if (argc != 0)
841 return KDB_ARGCOUNT;
842
843 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
844 if (strcmp(kp->name, argv[0]) == 0)
845 break;
846 }
847 if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
848 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
849 argv[0]);
850 return KDB_NOTIMP;
851 }
852 kmp = container_of(kp, struct kdb_macro, cmd);
853 list_for_each_entry(kms, &kmp->statements, list_node) {
854 /*
855 * Recursive use of kdb_parse, do not use argv after this point.
856 */
857 argv = NULL;
858 kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
859 ret = kdb_parse(kms->statement);
860 if (ret)
861 return ret;
862 }
863 return 0;
864}
865
866/* Command history */
867#define KDB_CMD_HISTORY_COUNT 32
868#define CMD_BUFLEN 200 /* kdb_printf: max printline
869 * size == 256 */
870static unsigned int cmd_head, cmd_tail;
871static unsigned int cmdptr;
872static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
873static char cmd_cur[CMD_BUFLEN];
874
875/*
876 * The "str" argument may point to something like | grep xyz
877 */
878static void parse_grep(const char *str)
879{
880 int len;
881 char *cp = (char *)str, *cp2;
882
883 /* sanity check: we should have been called with the \ first */
884 if (*cp != '|')
885 return;
886 cp++;
887 while (isspace(*cp))
888 cp++;
889 if (!str_has_prefix(cp, "grep ")) {
890 kdb_printf("invalid 'pipe', see grephelp\n");
891 return;
892 }
893 cp += 5;
894 while (isspace(*cp))
895 cp++;
896 cp2 = strchr(cp, '\n');
897 if (cp2)
898 *cp2 = '\0'; /* remove the trailing newline */
899 len = strlen(cp);
900 if (len == 0) {
901 kdb_printf("invalid 'pipe', see grephelp\n");
902 return;
903 }
904 /* now cp points to a nonzero length search string */
905 if (*cp == '"') {
906 /* allow it be "x y z" by removing the "'s - there must
907 be two of them */
908 cp++;
909 cp2 = strchr(cp, '"');
910 if (!cp2) {
911 kdb_printf("invalid quoted string, see grephelp\n");
912 return;
913 }
914 *cp2 = '\0'; /* end the string where the 2nd " was */
915 }
916 kdb_grep_leading = 0;
917 if (*cp == '^') {
918 kdb_grep_leading = 1;
919 cp++;
920 }
921 len = strlen(cp);
922 kdb_grep_trailing = 0;
923 if (*(cp+len-1) == '$') {
924 kdb_grep_trailing = 1;
925 *(cp+len-1) = '\0';
926 }
927 len = strlen(cp);
928 if (!len)
929 return;
930 if (len >= KDB_GREP_STRLEN) {
931 kdb_printf("search string too long\n");
932 return;
933 }
934 strcpy(kdb_grep_string, cp);
935 kdb_grepping_flag++;
936 return;
937}
938
939/*
940 * kdb_parse - Parse the command line, search the command table for a
941 * matching command and invoke the command function. This
942 * function may be called recursively, if it is, the second call
943 * will overwrite argv and cbuf. It is the caller's
944 * responsibility to save their argv if they recursively call
945 * kdb_parse().
946 * Parameters:
947 * cmdstr The input command line to be parsed.
948 * regs The registers at the time kdb was entered.
949 * Returns:
950 * Zero for success, a kdb diagnostic if failure.
951 * Remarks:
952 * Limited to 20 tokens.
953 *
954 * Real rudimentary tokenization. Basically only whitespace
955 * is considered a token delimiter (but special consideration
956 * is taken of the '=' sign as used by the 'set' command).
957 *
958 * The algorithm used to tokenize the input string relies on
959 * there being at least one whitespace (or otherwise useless)
960 * character between tokens as the character immediately following
961 * the token is altered in-place to a null-byte to terminate the
962 * token string.
963 */
964
965#define MAXARGC 20
966
967int kdb_parse(const char *cmdstr)
968{
969 static char *argv[MAXARGC];
970 static int argc;
971 static char cbuf[CMD_BUFLEN+2];
972 char *cp;
973 char *cpp, quoted;
974 kdbtab_t *tp;
975 int escaped, ignore_errors = 0, check_grep = 0;
976
977 /*
978 * First tokenize the command string.
979 */
980 cp = (char *)cmdstr;
981
982 if (KDB_FLAG(CMD_INTERRUPT)) {
983 /* Previous command was interrupted, newline must not
984 * repeat the command */
985 KDB_FLAG_CLEAR(CMD_INTERRUPT);
986 KDB_STATE_SET(PAGER);
987 argc = 0; /* no repeat */
988 }
989
990 if (*cp != '\n' && *cp != '\0') {
991 argc = 0;
992 cpp = cbuf;
993 while (*cp) {
994 /* skip whitespace */
995 while (isspace(*cp))
996 cp++;
997 if ((*cp == '\0') || (*cp == '\n') ||
998 (*cp == '#' && !defcmd_in_progress))
999 break;
1000 /* special case: check for | grep pattern */
1001 if (*cp == '|') {
1002 check_grep++;
1003 break;
1004 }
1005 if (cpp >= cbuf + CMD_BUFLEN) {
1006 kdb_printf("kdb_parse: command buffer "
1007 "overflow, command ignored\n%s\n",
1008 cmdstr);
1009 return KDB_NOTFOUND;
1010 }
1011 if (argc >= MAXARGC - 1) {
1012 kdb_printf("kdb_parse: too many arguments, "
1013 "command ignored\n%s\n", cmdstr);
1014 return KDB_NOTFOUND;
1015 }
1016 argv[argc++] = cpp;
1017 escaped = 0;
1018 quoted = '\0';
1019 /* Copy to next unquoted and unescaped
1020 * whitespace or '=' */
1021 while (*cp && *cp != '\n' &&
1022 (escaped || quoted || !isspace(*cp))) {
1023 if (cpp >= cbuf + CMD_BUFLEN)
1024 break;
1025 if (escaped) {
1026 escaped = 0;
1027 *cpp++ = *cp++;
1028 continue;
1029 }
1030 if (*cp == '\\') {
1031 escaped = 1;
1032 ++cp;
1033 continue;
1034 }
1035 if (*cp == quoted)
1036 quoted = '\0';
1037 else if (*cp == '\'' || *cp == '"')
1038 quoted = *cp;
1039 *cpp = *cp++;
1040 if (*cpp == '=' && !quoted)
1041 break;
1042 ++cpp;
1043 }
1044 *cpp++ = '\0'; /* Squash a ws or '=' character */
1045 }
1046 }
1047 if (!argc)
1048 return 0;
1049 if (check_grep)
1050 parse_grep(cp);
1051 if (defcmd_in_progress) {
1052 int result = kdb_defcmd2(cmdstr, argv[0]);
1053 if (!defcmd_in_progress) {
1054 argc = 0; /* avoid repeat on endefcmd */
1055 *(argv[0]) = '\0';
1056 }
1057 return result;
1058 }
1059 if (argv[0][0] == '-' && argv[0][1] &&
1060 (argv[0][1] < '0' || argv[0][1] > '9')) {
1061 ignore_errors = 1;
1062 ++argv[0];
1063 }
1064
1065 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1066 /*
1067 * If this command is allowed to be abbreviated,
1068 * check to see if this is it.
1069 */
1070 if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
1071 (strncmp(argv[0], tp->name, tp->minlen) == 0))
1072 break;
1073
1074 if (strcmp(argv[0], tp->name) == 0)
1075 break;
1076 }
1077
1078 /*
1079 * If we don't find a command by this name, see if the first
1080 * few characters of this match any of the known commands.
1081 * e.g., md1c20 should match md.
1082 */
1083 if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1084 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1085 if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
1086 break;
1087 }
1088 }
1089
1090 if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1091 int result;
1092
1093 if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
1094 return KDB_NOPERM;
1095
1096 KDB_STATE_SET(CMD);
1097 result = (*tp->func)(argc-1, (const char **)argv);
1098 if (result && ignore_errors && result > KDB_CMD_GO)
1099 result = 0;
1100 KDB_STATE_CLEAR(CMD);
1101
1102 if (tp->flags & KDB_REPEAT_WITH_ARGS)
1103 return result;
1104
1105 argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1106 if (argv[argc])
1107 *(argv[argc]) = '\0';
1108 return result;
1109 }
1110
1111 /*
1112 * If the input with which we were presented does not
1113 * map to an existing command, attempt to parse it as an
1114 * address argument and display the result. Useful for
1115 * obtaining the address of a variable, or the nearest symbol
1116 * to an address contained in a register.
1117 */
1118 {
1119 unsigned long value;
1120 char *name = NULL;
1121 long offset;
1122 int nextarg = 0;
1123
1124 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1125 &value, &offset, &name)) {
1126 return KDB_NOTFOUND;
1127 }
1128
1129 kdb_printf("%s = ", argv[0]);
1130 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1131 kdb_printf("\n");
1132 return 0;
1133 }
1134}
1135
1136
1137static int handle_ctrl_cmd(char *cmd)
1138{
1139#define CTRL_P 16
1140#define CTRL_N 14
1141
1142 /* initial situation */
1143 if (cmd_head == cmd_tail)
1144 return 0;
1145 switch (*cmd) {
1146 case CTRL_P:
1147 if (cmdptr != cmd_tail)
1148 cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
1149 KDB_CMD_HISTORY_COUNT;
1150 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1151 return 1;
1152 case CTRL_N:
1153 if (cmdptr != cmd_head)
1154 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1155 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1156 return 1;
1157 }
1158 return 0;
1159}
1160
1161/*
1162 * kdb_reboot - This function implements the 'reboot' command. Reboot
1163 * the system immediately, or loop for ever on failure.
1164 */
1165static int kdb_reboot(int argc, const char **argv)
1166{
1167 emergency_restart();
1168 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1169 while (1)
1170 cpu_relax();
1171 /* NOTREACHED */
1172 return 0;
1173}
1174
1175static void kdb_dumpregs(struct pt_regs *regs)
1176{
1177 int old_lvl = console_loglevel;
1178 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1179 kdb_trap_printk++;
1180 show_regs(regs);
1181 kdb_trap_printk--;
1182 kdb_printf("\n");
1183 console_loglevel = old_lvl;
1184}
1185
1186static void kdb_set_current_task(struct task_struct *p)
1187{
1188 kdb_current_task = p;
1189
1190 if (kdb_task_has_cpu(p)) {
1191 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1192 return;
1193 }
1194 kdb_current_regs = NULL;
1195}
1196
1197static void drop_newline(char *buf)
1198{
1199 size_t len = strlen(buf);
1200
1201 if (len == 0)
1202 return;
1203 if (*(buf + len - 1) == '\n')
1204 *(buf + len - 1) = '\0';
1205}
1206
1207/*
1208 * kdb_local - The main code for kdb. This routine is invoked on a
1209 * specific processor, it is not global. The main kdb() routine
1210 * ensures that only one processor at a time is in this routine.
1211 * This code is called with the real reason code on the first
1212 * entry to a kdb session, thereafter it is called with reason
1213 * SWITCH, even if the user goes back to the original cpu.
1214 * Inputs:
1215 * reason The reason KDB was invoked
1216 * error The hardware-defined error code
1217 * regs The exception frame at time of fault/breakpoint.
1218 * db_result Result code from the break or debug point.
1219 * Returns:
1220 * 0 KDB was invoked for an event which it wasn't responsible
1221 * 1 KDB handled the event for which it was invoked.
1222 * KDB_CMD_GO User typed 'go'.
1223 * KDB_CMD_CPU User switched to another cpu.
1224 * KDB_CMD_SS Single step.
1225 */
1226static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1227 kdb_dbtrap_t db_result)
1228{
1229 char *cmdbuf;
1230 int diag;
1231 struct task_struct *kdb_current =
1232 kdb_curr_task(raw_smp_processor_id());
1233
1234 KDB_DEBUG_STATE("kdb_local 1", reason);
1235
1236 kdb_check_for_lockdown();
1237
1238 kdb_go_count = 0;
1239 if (reason == KDB_REASON_DEBUG) {
1240 /* special case below */
1241 } else {
1242 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1243 kdb_current, kdb_current ? kdb_current->pid : 0);
1244#if defined(CONFIG_SMP)
1245 kdb_printf("on processor %d ", raw_smp_processor_id());
1246#endif
1247 }
1248
1249 switch (reason) {
1250 case KDB_REASON_DEBUG:
1251 {
1252 /*
1253 * If re-entering kdb after a single step
1254 * command, don't print the message.
1255 */
1256 switch (db_result) {
1257 case KDB_DB_BPT:
1258 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1259 kdb_current, kdb_current->pid);
1260#if defined(CONFIG_SMP)
1261 kdb_printf("on processor %d ", raw_smp_processor_id());
1262#endif
1263 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1264 instruction_pointer(regs));
1265 break;
1266 case KDB_DB_SS:
1267 break;
1268 case KDB_DB_SSBPT:
1269 KDB_DEBUG_STATE("kdb_local 4", reason);
1270 return 1; /* kdba_db_trap did the work */
1271 default:
1272 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1273 db_result);
1274 break;
1275 }
1276
1277 }
1278 break;
1279 case KDB_REASON_ENTER:
1280 if (KDB_STATE(KEYBOARD))
1281 kdb_printf("due to Keyboard Entry\n");
1282 else
1283 kdb_printf("due to KDB_ENTER()\n");
1284 break;
1285 case KDB_REASON_KEYBOARD:
1286 KDB_STATE_SET(KEYBOARD);
1287 kdb_printf("due to Keyboard Entry\n");
1288 break;
1289 case KDB_REASON_ENTER_SLAVE:
1290 /* drop through, slaves only get released via cpu switch */
1291 case KDB_REASON_SWITCH:
1292 kdb_printf("due to cpu switch\n");
1293 break;
1294 case KDB_REASON_OOPS:
1295 kdb_printf("Oops: %s\n", kdb_diemsg);
1296 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1297 instruction_pointer(regs));
1298 kdb_dumpregs(regs);
1299 break;
1300 case KDB_REASON_SYSTEM_NMI:
1301 kdb_printf("due to System NonMaskable Interrupt\n");
1302 break;
1303 case KDB_REASON_NMI:
1304 kdb_printf("due to NonMaskable Interrupt @ "
1305 kdb_machreg_fmt "\n",
1306 instruction_pointer(regs));
1307 break;
1308 case KDB_REASON_SSTEP:
1309 case KDB_REASON_BREAK:
1310 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1311 reason == KDB_REASON_BREAK ?
1312 "Breakpoint" : "SS trap", instruction_pointer(regs));
1313 /*
1314 * Determine if this breakpoint is one that we
1315 * are interested in.
1316 */
1317 if (db_result != KDB_DB_BPT) {
1318 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1319 db_result);
1320 KDB_DEBUG_STATE("kdb_local 6", reason);
1321 return 0; /* Not for us, dismiss it */
1322 }
1323 break;
1324 case KDB_REASON_RECURSE:
1325 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1326 instruction_pointer(regs));
1327 break;
1328 default:
1329 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1330 KDB_DEBUG_STATE("kdb_local 8", reason);
1331 return 0; /* Not for us, dismiss it */
1332 }
1333
1334 while (1) {
1335 /*
1336 * Initialize pager context.
1337 */
1338 kdb_nextline = 1;
1339 KDB_STATE_CLEAR(SUPPRESS);
1340 kdb_grepping_flag = 0;
1341 /* ensure the old search does not leak into '/' commands */
1342 kdb_grep_string[0] = '\0';
1343
1344 cmdbuf = cmd_cur;
1345 *cmdbuf = '\0';
1346 *(cmd_hist[cmd_head]) = '\0';
1347
1348do_full_getstr:
1349 /* PROMPT can only be set if we have MEM_READ permission. */
1350 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1351 raw_smp_processor_id());
1352 if (defcmd_in_progress)
1353 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1354
1355 /*
1356 * Fetch command from keyboard
1357 */
1358 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1359 if (*cmdbuf != '\n') {
1360 if (*cmdbuf < 32) {
1361 if (cmdptr == cmd_head) {
1362 strscpy(cmd_hist[cmd_head], cmd_cur,
1363 CMD_BUFLEN);
1364 *(cmd_hist[cmd_head] +
1365 strlen(cmd_hist[cmd_head])-1) = '\0';
1366 }
1367 if (!handle_ctrl_cmd(cmdbuf))
1368 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1369 cmdbuf = cmd_cur;
1370 goto do_full_getstr;
1371 } else {
1372 strscpy(cmd_hist[cmd_head], cmd_cur,
1373 CMD_BUFLEN);
1374 }
1375
1376 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1377 if (cmd_head == cmd_tail)
1378 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1379 }
1380
1381 cmdptr = cmd_head;
1382 diag = kdb_parse(cmdbuf);
1383 if (diag == KDB_NOTFOUND) {
1384 drop_newline(cmdbuf);
1385 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1386 diag = 0;
1387 }
1388 if (diag == KDB_CMD_GO
1389 || diag == KDB_CMD_CPU
1390 || diag == KDB_CMD_SS
1391 || diag == KDB_CMD_KGDB)
1392 break;
1393
1394 if (diag)
1395 kdb_cmderror(diag);
1396 }
1397 KDB_DEBUG_STATE("kdb_local 9", diag);
1398 return diag;
1399}
1400
1401
1402/*
1403 * kdb_print_state - Print the state data for the current processor
1404 * for debugging.
1405 * Inputs:
1406 * text Identifies the debug point
1407 * value Any integer value to be printed, e.g. reason code.
1408 */
1409void kdb_print_state(const char *text, int value)
1410{
1411 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1412 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1413 kdb_state);
1414}
1415
1416/*
1417 * kdb_main_loop - After initial setup and assignment of the
1418 * controlling cpu, all cpus are in this loop. One cpu is in
1419 * control and will issue the kdb prompt, the others will spin
1420 * until 'go' or cpu switch.
1421 *
1422 * To get a consistent view of the kernel stacks for all
1423 * processes, this routine is invoked from the main kdb code via
1424 * an architecture specific routine. kdba_main_loop is
1425 * responsible for making the kernel stacks consistent for all
1426 * processes, there should be no difference between a blocked
1427 * process and a running process as far as kdb is concerned.
1428 * Inputs:
1429 * reason The reason KDB was invoked
1430 * error The hardware-defined error code
1431 * reason2 kdb's current reason code.
1432 * Initially error but can change
1433 * according to kdb state.
1434 * db_result Result code from break or debug point.
1435 * regs The exception frame at time of fault/breakpoint.
1436 * should always be valid.
1437 * Returns:
1438 * 0 KDB was invoked for an event which it wasn't responsible
1439 * 1 KDB handled the event for which it was invoked.
1440 */
1441int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1442 kdb_dbtrap_t db_result, struct pt_regs *regs)
1443{
1444 int result = 1;
1445 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1446 while (1) {
1447 /*
1448 * All processors except the one that is in control
1449 * will spin here.
1450 */
1451 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1452 while (KDB_STATE(HOLD_CPU)) {
1453 /* state KDB is turned off by kdb_cpu to see if the
1454 * other cpus are still live, each cpu in this loop
1455 * turns it back on.
1456 */
1457 if (!KDB_STATE(KDB))
1458 KDB_STATE_SET(KDB);
1459 }
1460
1461 KDB_STATE_CLEAR(SUPPRESS);
1462 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1463 if (KDB_STATE(LEAVING))
1464 break; /* Another cpu said 'go' */
1465 /* Still using kdb, this processor is in control */
1466 result = kdb_local(reason2, error, regs, db_result);
1467 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1468
1469 if (result == KDB_CMD_CPU)
1470 break;
1471
1472 if (result == KDB_CMD_SS) {
1473 KDB_STATE_SET(DOING_SS);
1474 break;
1475 }
1476
1477 if (result == KDB_CMD_KGDB) {
1478 if (!KDB_STATE(DOING_KGDB))
1479 kdb_printf("Entering please attach debugger "
1480 "or use $D#44+ or $3#33\n");
1481 break;
1482 }
1483 if (result && result != 1 && result != KDB_CMD_GO)
1484 kdb_printf("\nUnexpected kdb_local return code %d\n",
1485 result);
1486 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1487 break;
1488 }
1489 if (KDB_STATE(DOING_SS))
1490 KDB_STATE_CLEAR(SSBPT);
1491
1492 /* Clean up any keyboard devices before leaving */
1493 kdb_kbd_cleanup_state();
1494
1495 return result;
1496}
1497
1498/*
1499 * kdb_mdr - This function implements the guts of the 'mdr', memory
1500 * read command.
1501 * mdr <addr arg>,<byte count>
1502 * Inputs:
1503 * addr Start address
1504 * count Number of bytes
1505 * Returns:
1506 * Always 0. Any errors are detected and printed by kdb_getarea.
1507 */
1508static int kdb_mdr(unsigned long addr, unsigned int count)
1509{
1510 unsigned char c;
1511 while (count--) {
1512 if (kdb_getarea(c, addr))
1513 return 0;
1514 kdb_printf("%02x", c);
1515 addr++;
1516 }
1517 kdb_printf("\n");
1518 return 0;
1519}
1520
1521/*
1522 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1523 * 'md8' 'mdr' and 'mds' commands.
1524 *
1525 * md|mds [<addr arg> [<line count> [<radix>]]]
1526 * mdWcN [<addr arg> [<line count> [<radix>]]]
1527 * where W = is the width (1, 2, 4 or 8) and N is the count.
1528 * for eg., md1c20 reads 20 bytes, 1 at a time.
1529 * mdr <addr arg>,<byte count>
1530 */
1531static void kdb_md_line(const char *fmtstr, unsigned long addr,
1532 int symbolic, int nosect, int bytesperword,
1533 int num, int repeat, int phys)
1534{
1535 /* print just one line of data */
1536 kdb_symtab_t symtab;
1537 char cbuf[32];
1538 char *c = cbuf;
1539 int i;
1540 int j;
1541 unsigned long word;
1542
1543 memset(cbuf, '\0', sizeof(cbuf));
1544 if (phys)
1545 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1546 else
1547 kdb_printf(kdb_machreg_fmt0 " ", addr);
1548
1549 for (i = 0; i < num && repeat--; i++) {
1550 if (phys) {
1551 if (kdb_getphysword(&word, addr, bytesperword))
1552 break;
1553 } else if (kdb_getword(&word, addr, bytesperword))
1554 break;
1555 kdb_printf(fmtstr, word);
1556 if (symbolic)
1557 kdbnearsym(word, &symtab);
1558 else
1559 memset(&symtab, 0, sizeof(symtab));
1560 if (symtab.sym_name) {
1561 kdb_symbol_print(word, &symtab, 0);
1562 if (!nosect) {
1563 kdb_printf("\n");
1564 kdb_printf(" %s %s "
1565 kdb_machreg_fmt " "
1566 kdb_machreg_fmt " "
1567 kdb_machreg_fmt, symtab.mod_name,
1568 symtab.sec_name, symtab.sec_start,
1569 symtab.sym_start, symtab.sym_end);
1570 }
1571 addr += bytesperword;
1572 } else {
1573 union {
1574 u64 word;
1575 unsigned char c[8];
1576 } wc;
1577 unsigned char *cp;
1578#ifdef __BIG_ENDIAN
1579 cp = wc.c + 8 - bytesperword;
1580#else
1581 cp = wc.c;
1582#endif
1583 wc.word = word;
1584#define printable_char(c) \
1585 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1586 for (j = 0; j < bytesperword; j++)
1587 *c++ = printable_char(*cp++);
1588 addr += bytesperword;
1589#undef printable_char
1590 }
1591 }
1592 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1593 " ", cbuf);
1594}
1595
1596static int kdb_md(int argc, const char **argv)
1597{
1598 static unsigned long last_addr;
1599 static int last_radix, last_bytesperword, last_repeat;
1600 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1601 int nosect = 0;
1602 char fmtchar, fmtstr[64];
1603 unsigned long addr;
1604 unsigned long word;
1605 long offset = 0;
1606 int symbolic = 0;
1607 int valid = 0;
1608 int phys = 0;
1609 int raw = 0;
1610
1611 kdbgetintenv("MDCOUNT", &mdcount);
1612 kdbgetintenv("RADIX", &radix);
1613 kdbgetintenv("BYTESPERWORD", &bytesperword);
1614
1615 /* Assume 'md <addr>' and start with environment values */
1616 repeat = mdcount * 16 / bytesperword;
1617
1618 if (strcmp(argv[0], "mdr") == 0) {
1619 if (argc == 2 || (argc == 0 && last_addr != 0))
1620 valid = raw = 1;
1621 else
1622 return KDB_ARGCOUNT;
1623 } else if (isdigit(argv[0][2])) {
1624 bytesperword = (int)(argv[0][2] - '0');
1625 if (bytesperword == 0) {
1626 bytesperword = last_bytesperword;
1627 if (bytesperword == 0)
1628 bytesperword = 4;
1629 }
1630 last_bytesperword = bytesperword;
1631 repeat = mdcount * 16 / bytesperword;
1632 if (!argv[0][3])
1633 valid = 1;
1634 else if (argv[0][3] == 'c' && argv[0][4]) {
1635 char *p;
1636 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1637 mdcount = ((repeat * bytesperword) + 15) / 16;
1638 valid = !*p;
1639 }
1640 last_repeat = repeat;
1641 } else if (strcmp(argv[0], "md") == 0)
1642 valid = 1;
1643 else if (strcmp(argv[0], "mds") == 0)
1644 valid = 1;
1645 else if (strcmp(argv[0], "mdp") == 0) {
1646 phys = valid = 1;
1647 }
1648 if (!valid)
1649 return KDB_NOTFOUND;
1650
1651 if (argc == 0) {
1652 if (last_addr == 0)
1653 return KDB_ARGCOUNT;
1654 addr = last_addr;
1655 radix = last_radix;
1656 bytesperword = last_bytesperword;
1657 repeat = last_repeat;
1658 if (raw)
1659 mdcount = repeat;
1660 else
1661 mdcount = ((repeat * bytesperword) + 15) / 16;
1662 }
1663
1664 if (argc) {
1665 unsigned long val;
1666 int diag, nextarg = 1;
1667 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1668 &offset, NULL);
1669 if (diag)
1670 return diag;
1671 if (argc > nextarg+2)
1672 return KDB_ARGCOUNT;
1673
1674 if (argc >= nextarg) {
1675 diag = kdbgetularg(argv[nextarg], &val);
1676 if (!diag) {
1677 mdcount = (int) val;
1678 if (raw)
1679 repeat = mdcount;
1680 else
1681 repeat = mdcount * 16 / bytesperword;
1682 }
1683 }
1684 if (argc >= nextarg+1) {
1685 diag = kdbgetularg(argv[nextarg+1], &val);
1686 if (!diag)
1687 radix = (int) val;
1688 }
1689 }
1690
1691 if (strcmp(argv[0], "mdr") == 0) {
1692 int ret;
1693 last_addr = addr;
1694 ret = kdb_mdr(addr, mdcount);
1695 last_addr += mdcount;
1696 last_repeat = mdcount;
1697 last_bytesperword = bytesperword; // to make REPEAT happy
1698 return ret;
1699 }
1700
1701 switch (radix) {
1702 case 10:
1703 fmtchar = 'd';
1704 break;
1705 case 16:
1706 fmtchar = 'x';
1707 break;
1708 case 8:
1709 fmtchar = 'o';
1710 break;
1711 default:
1712 return KDB_BADRADIX;
1713 }
1714
1715 last_radix = radix;
1716
1717 if (bytesperword > KDB_WORD_SIZE)
1718 return KDB_BADWIDTH;
1719
1720 switch (bytesperword) {
1721 case 8:
1722 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1723 break;
1724 case 4:
1725 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1726 break;
1727 case 2:
1728 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1729 break;
1730 case 1:
1731 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1732 break;
1733 default:
1734 return KDB_BADWIDTH;
1735 }
1736
1737 last_repeat = repeat;
1738 last_bytesperword = bytesperword;
1739
1740 if (strcmp(argv[0], "mds") == 0) {
1741 symbolic = 1;
1742 /* Do not save these changes as last_*, they are temporary mds
1743 * overrides.
1744 */
1745 bytesperword = KDB_WORD_SIZE;
1746 repeat = mdcount;
1747 kdbgetintenv("NOSECT", &nosect);
1748 }
1749
1750 /* Round address down modulo BYTESPERWORD */
1751
1752 addr &= ~(bytesperword-1);
1753
1754 while (repeat > 0) {
1755 unsigned long a;
1756 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1757
1758 if (KDB_FLAG(CMD_INTERRUPT))
1759 return 0;
1760 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1761 if (phys) {
1762 if (kdb_getphysword(&word, a, bytesperword)
1763 || word)
1764 break;
1765 } else if (kdb_getword(&word, a, bytesperword) || word)
1766 break;
1767 }
1768 n = min(num, repeat);
1769 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1770 num, repeat, phys);
1771 addr += bytesperword * n;
1772 repeat -= n;
1773 z = (z + num - 1) / num;
1774 if (z > 2) {
1775 int s = num * (z-2);
1776 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1777 " zero suppressed\n",
1778 addr, addr + bytesperword * s - 1);
1779 addr += bytesperword * s;
1780 repeat -= s;
1781 }
1782 }
1783 last_addr = addr;
1784
1785 return 0;
1786}
1787
1788/*
1789 * kdb_mm - This function implements the 'mm' command.
1790 * mm address-expression new-value
1791 * Remarks:
1792 * mm works on machine words, mmW works on bytes.
1793 */
1794static int kdb_mm(int argc, const char **argv)
1795{
1796 int diag;
1797 unsigned long addr;
1798 long offset = 0;
1799 unsigned long contents;
1800 int nextarg;
1801 int width;
1802
1803 if (argv[0][2] && !isdigit(argv[0][2]))
1804 return KDB_NOTFOUND;
1805
1806 if (argc < 2)
1807 return KDB_ARGCOUNT;
1808
1809 nextarg = 1;
1810 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1811 if (diag)
1812 return diag;
1813
1814 if (nextarg > argc)
1815 return KDB_ARGCOUNT;
1816 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1817 if (diag)
1818 return diag;
1819
1820 if (nextarg != argc + 1)
1821 return KDB_ARGCOUNT;
1822
1823 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1824 diag = kdb_putword(addr, contents, width);
1825 if (diag)
1826 return diag;
1827
1828 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1829
1830 return 0;
1831}
1832
1833/*
1834 * kdb_go - This function implements the 'go' command.
1835 * go [address-expression]
1836 */
1837static int kdb_go(int argc, const char **argv)
1838{
1839 unsigned long addr;
1840 int diag;
1841 int nextarg;
1842 long offset;
1843
1844 if (raw_smp_processor_id() != kdb_initial_cpu) {
1845 kdb_printf("go must execute on the entry cpu, "
1846 "please use \"cpu %d\" and then execute go\n",
1847 kdb_initial_cpu);
1848 return KDB_BADCPUNUM;
1849 }
1850 if (argc == 1) {
1851 nextarg = 1;
1852 diag = kdbgetaddrarg(argc, argv, &nextarg,
1853 &addr, &offset, NULL);
1854 if (diag)
1855 return diag;
1856 } else if (argc) {
1857 return KDB_ARGCOUNT;
1858 }
1859
1860 diag = KDB_CMD_GO;
1861 if (KDB_FLAG(CATASTROPHIC)) {
1862 kdb_printf("Catastrophic error detected\n");
1863 kdb_printf("kdb_continue_catastrophic=%d, ",
1864 kdb_continue_catastrophic);
1865 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1866 kdb_printf("type go a second time if you really want "
1867 "to continue\n");
1868 return 0;
1869 }
1870 if (kdb_continue_catastrophic == 2) {
1871 kdb_printf("forcing reboot\n");
1872 kdb_reboot(0, NULL);
1873 }
1874 kdb_printf("attempting to continue\n");
1875 }
1876 return diag;
1877}
1878
1879/*
1880 * kdb_rd - This function implements the 'rd' command.
1881 */
1882static int kdb_rd(int argc, const char **argv)
1883{
1884 int len = kdb_check_regs();
1885#if DBG_MAX_REG_NUM > 0
1886 int i;
1887 char *rname;
1888 int rsize;
1889 u64 reg64;
1890 u32 reg32;
1891 u16 reg16;
1892 u8 reg8;
1893
1894 if (len)
1895 return len;
1896
1897 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1898 rsize = dbg_reg_def[i].size * 2;
1899 if (rsize > 16)
1900 rsize = 2;
1901 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1902 len = 0;
1903 kdb_printf("\n");
1904 }
1905 if (len)
1906 len += kdb_printf(" ");
1907 switch(dbg_reg_def[i].size * 8) {
1908 case 8:
1909 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1910 if (!rname)
1911 break;
1912 len += kdb_printf("%s: %02x", rname, reg8);
1913 break;
1914 case 16:
1915 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1916 if (!rname)
1917 break;
1918 len += kdb_printf("%s: %04x", rname, reg16);
1919 break;
1920 case 32:
1921 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1922 if (!rname)
1923 break;
1924 len += kdb_printf("%s: %08x", rname, reg32);
1925 break;
1926 case 64:
1927 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1928 if (!rname)
1929 break;
1930 len += kdb_printf("%s: %016llx", rname, reg64);
1931 break;
1932 default:
1933 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1934 }
1935 }
1936 kdb_printf("\n");
1937#else
1938 if (len)
1939 return len;
1940
1941 kdb_dumpregs(kdb_current_regs);
1942#endif
1943 return 0;
1944}
1945
1946/*
1947 * kdb_rm - This function implements the 'rm' (register modify) command.
1948 * rm register-name new-contents
1949 * Remarks:
1950 * Allows register modification with the same restrictions as gdb
1951 */
1952static int kdb_rm(int argc, const char **argv)
1953{
1954#if DBG_MAX_REG_NUM > 0
1955 int diag;
1956 const char *rname;
1957 int i;
1958 u64 reg64;
1959 u32 reg32;
1960 u16 reg16;
1961 u8 reg8;
1962
1963 if (argc != 2)
1964 return KDB_ARGCOUNT;
1965 /*
1966 * Allow presence or absence of leading '%' symbol.
1967 */
1968 rname = argv[1];
1969 if (*rname == '%')
1970 rname++;
1971
1972 diag = kdbgetu64arg(argv[2], ®64);
1973 if (diag)
1974 return diag;
1975
1976 diag = kdb_check_regs();
1977 if (diag)
1978 return diag;
1979
1980 diag = KDB_BADREG;
1981 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1982 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1983 diag = 0;
1984 break;
1985 }
1986 }
1987 if (!diag) {
1988 switch(dbg_reg_def[i].size * 8) {
1989 case 8:
1990 reg8 = reg64;
1991 dbg_set_reg(i, ®8, kdb_current_regs);
1992 break;
1993 case 16:
1994 reg16 = reg64;
1995 dbg_set_reg(i, ®16, kdb_current_regs);
1996 break;
1997 case 32:
1998 reg32 = reg64;
1999 dbg_set_reg(i, ®32, kdb_current_regs);
2000 break;
2001 case 64:
2002 dbg_set_reg(i, ®64, kdb_current_regs);
2003 break;
2004 }
2005 }
2006 return diag;
2007#else
2008 kdb_printf("ERROR: Register set currently not implemented\n");
2009 return 0;
2010#endif
2011}
2012
2013#if defined(CONFIG_MAGIC_SYSRQ)
2014/*
2015 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
2016 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
2017 * sr <magic-sysrq-code>
2018 */
2019static int kdb_sr(int argc, const char **argv)
2020{
2021 bool check_mask =
2022 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
2023
2024 if (argc != 1)
2025 return KDB_ARGCOUNT;
2026
2027 kdb_trap_printk++;
2028 __handle_sysrq(*argv[1], check_mask);
2029 kdb_trap_printk--;
2030
2031 return 0;
2032}
2033#endif /* CONFIG_MAGIC_SYSRQ */
2034
2035/*
2036 * kdb_ef - This function implements the 'regs' (display exception
2037 * frame) command. This command takes an address and expects to
2038 * find an exception frame at that address, formats and prints
2039 * it.
2040 * regs address-expression
2041 * Remarks:
2042 * Not done yet.
2043 */
2044static int kdb_ef(int argc, const char **argv)
2045{
2046 int diag;
2047 unsigned long addr;
2048 long offset;
2049 int nextarg;
2050
2051 if (argc != 1)
2052 return KDB_ARGCOUNT;
2053
2054 nextarg = 1;
2055 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2056 if (diag)
2057 return diag;
2058 show_regs((struct pt_regs *)addr);
2059 return 0;
2060}
2061
2062/*
2063 * kdb_env - This function implements the 'env' command. Display the
2064 * current environment variables.
2065 */
2066
2067static int kdb_env(int argc, const char **argv)
2068{
2069 kdb_printenv();
2070
2071 if (KDB_DEBUG(MASK))
2072 kdb_printf("KDBDEBUG=0x%x\n",
2073 (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
2074
2075 return 0;
2076}
2077
2078#ifdef CONFIG_PRINTK
2079/*
2080 * kdb_dmesg - This function implements the 'dmesg' command to display
2081 * the contents of the syslog buffer.
2082 * dmesg [lines] [adjust]
2083 */
2084static int kdb_dmesg(int argc, const char **argv)
2085{
2086 int diag;
2087 int logging;
2088 int lines = 0;
2089 int adjust = 0;
2090 int n = 0;
2091 int skip = 0;
2092 struct kmsg_dump_iter iter;
2093 size_t len;
2094 char buf[201];
2095
2096 if (argc > 2)
2097 return KDB_ARGCOUNT;
2098 if (argc) {
2099 char *cp;
2100 lines = simple_strtol(argv[1], &cp, 0);
2101 if (*cp)
2102 lines = 0;
2103 if (argc > 1) {
2104 adjust = simple_strtoul(argv[2], &cp, 0);
2105 if (*cp || adjust < 0)
2106 adjust = 0;
2107 }
2108 }
2109
2110 /* disable LOGGING if set */
2111 diag = kdbgetintenv("LOGGING", &logging);
2112 if (!diag && logging) {
2113 const char *setargs[] = { "set", "LOGGING", "0" };
2114 kdb_set(2, setargs);
2115 }
2116
2117 kmsg_dump_rewind(&iter);
2118 while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL))
2119 n++;
2120
2121 if (lines < 0) {
2122 if (adjust >= n)
2123 kdb_printf("buffer only contains %d lines, nothing "
2124 "printed\n", n);
2125 else if (adjust - lines >= n)
2126 kdb_printf("buffer only contains %d lines, last %d "
2127 "lines printed\n", n, n - adjust);
2128 skip = adjust;
2129 lines = abs(lines);
2130 } else if (lines > 0) {
2131 skip = n - lines - adjust;
2132 lines = abs(lines);
2133 if (adjust >= n) {
2134 kdb_printf("buffer only contains %d lines, "
2135 "nothing printed\n", n);
2136 skip = n;
2137 } else if (skip < 0) {
2138 lines += skip;
2139 skip = 0;
2140 kdb_printf("buffer only contains %d lines, first "
2141 "%d lines printed\n", n, lines);
2142 }
2143 } else {
2144 lines = n;
2145 }
2146
2147 if (skip >= n || skip < 0)
2148 return 0;
2149
2150 kmsg_dump_rewind(&iter);
2151 while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) {
2152 if (skip) {
2153 skip--;
2154 continue;
2155 }
2156 if (!lines--)
2157 break;
2158 if (KDB_FLAG(CMD_INTERRUPT))
2159 return 0;
2160
2161 kdb_printf("%.*s\n", (int)len - 1, buf);
2162 }
2163
2164 return 0;
2165}
2166#endif /* CONFIG_PRINTK */
2167
2168/* Make sure we balance enable/disable calls, must disable first. */
2169static atomic_t kdb_nmi_disabled;
2170
2171static int kdb_disable_nmi(int argc, const char *argv[])
2172{
2173 if (atomic_read(&kdb_nmi_disabled))
2174 return 0;
2175 atomic_set(&kdb_nmi_disabled, 1);
2176 arch_kgdb_ops.enable_nmi(0);
2177 return 0;
2178}
2179
2180static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2181{
2182 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2183 return -EINVAL;
2184 arch_kgdb_ops.enable_nmi(1);
2185 return 0;
2186}
2187
2188static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2189 .set = kdb_param_enable_nmi,
2190};
2191module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2192
2193/*
2194 * kdb_cpu - This function implements the 'cpu' command.
2195 * cpu [<cpunum>]
2196 * Returns:
2197 * KDB_CMD_CPU for success, a kdb diagnostic if error
2198 */
2199static void kdb_cpu_status(void)
2200{
2201 int i, start_cpu, first_print = 1;
2202 char state, prev_state = '?';
2203
2204 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2205 kdb_printf("Available cpus: ");
2206 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2207 if (!cpu_online(i)) {
2208 state = 'F'; /* cpu is offline */
2209 } else if (!kgdb_info[i].enter_kgdb) {
2210 state = 'D'; /* cpu is online but unresponsive */
2211 } else {
2212 state = ' '; /* cpu is responding to kdb */
2213 if (kdb_task_state_char(KDB_TSK(i)) == '-')
2214 state = '-'; /* idle task */
2215 }
2216 if (state != prev_state) {
2217 if (prev_state != '?') {
2218 if (!first_print)
2219 kdb_printf(", ");
2220 first_print = 0;
2221 kdb_printf("%d", start_cpu);
2222 if (start_cpu < i-1)
2223 kdb_printf("-%d", i-1);
2224 if (prev_state != ' ')
2225 kdb_printf("(%c)", prev_state);
2226 }
2227 prev_state = state;
2228 start_cpu = i;
2229 }
2230 }
2231 /* print the trailing cpus, ignoring them if they are all offline */
2232 if (prev_state != 'F') {
2233 if (!first_print)
2234 kdb_printf(", ");
2235 kdb_printf("%d", start_cpu);
2236 if (start_cpu < i-1)
2237 kdb_printf("-%d", i-1);
2238 if (prev_state != ' ')
2239 kdb_printf("(%c)", prev_state);
2240 }
2241 kdb_printf("\n");
2242}
2243
2244static int kdb_cpu(int argc, const char **argv)
2245{
2246 unsigned long cpunum;
2247 int diag;
2248
2249 if (argc == 0) {
2250 kdb_cpu_status();
2251 return 0;
2252 }
2253
2254 if (argc != 1)
2255 return KDB_ARGCOUNT;
2256
2257 diag = kdbgetularg(argv[1], &cpunum);
2258 if (diag)
2259 return diag;
2260
2261 /*
2262 * Validate cpunum
2263 */
2264 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2265 return KDB_BADCPUNUM;
2266
2267 dbg_switch_cpu = cpunum;
2268
2269 /*
2270 * Switch to other cpu
2271 */
2272 return KDB_CMD_CPU;
2273}
2274
2275/* The user may not realize that ps/bta with no parameters does not print idle
2276 * or sleeping system daemon processes, so tell them how many were suppressed.
2277 */
2278void kdb_ps_suppressed(void)
2279{
2280 int idle = 0, daemon = 0;
2281 unsigned long cpu;
2282 const struct task_struct *p, *g;
2283 for_each_online_cpu(cpu) {
2284 p = kdb_curr_task(cpu);
2285 if (kdb_task_state(p, "-"))
2286 ++idle;
2287 }
2288 for_each_process_thread(g, p) {
2289 if (kdb_task_state(p, "ims"))
2290 ++daemon;
2291 }
2292 if (idle || daemon) {
2293 if (idle)
2294 kdb_printf("%d idle process%s (state -)%s\n",
2295 idle, idle == 1 ? "" : "es",
2296 daemon ? " and " : "");
2297 if (daemon)
2298 kdb_printf("%d sleeping system daemon (state [ims]) "
2299 "process%s", daemon,
2300 daemon == 1 ? "" : "es");
2301 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2302 }
2303}
2304
2305void kdb_ps1(const struct task_struct *p)
2306{
2307 int cpu;
2308 unsigned long tmp;
2309
2310 if (!p ||
2311 copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
2312 return;
2313
2314 cpu = kdb_process_cpu(p);
2315 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2316 (void *)p, p->pid, p->parent->pid,
2317 kdb_task_has_cpu(p), kdb_process_cpu(p),
2318 kdb_task_state_char(p),
2319 (void *)(&p->thread),
2320 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2321 p->comm);
2322 if (kdb_task_has_cpu(p)) {
2323 if (!KDB_TSK(cpu)) {
2324 kdb_printf(" Error: no saved data for this cpu\n");
2325 } else {
2326 if (KDB_TSK(cpu) != p)
2327 kdb_printf(" Error: does not match running "
2328 "process table (0x%px)\n", KDB_TSK(cpu));
2329 }
2330 }
2331}
2332
2333/*
2334 * kdb_ps - This function implements the 'ps' command which shows a
2335 * list of the active processes.
2336 *
2337 * ps [<state_chars>] Show processes, optionally selecting only those whose
2338 * state character is found in <state_chars>.
2339 */
2340static int kdb_ps(int argc, const char **argv)
2341{
2342 struct task_struct *g, *p;
2343 const char *mask;
2344 unsigned long cpu;
2345
2346 if (argc == 0)
2347 kdb_ps_suppressed();
2348 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2349 (int)(2*sizeof(void *))+2, "Task Addr",
2350 (int)(2*sizeof(void *))+2, "Thread");
2351 mask = argc ? argv[1] : kdbgetenv("PS");
2352 /* Run the active tasks first */
2353 for_each_online_cpu(cpu) {
2354 if (KDB_FLAG(CMD_INTERRUPT))
2355 return 0;
2356 p = kdb_curr_task(cpu);
2357 if (kdb_task_state(p, mask))
2358 kdb_ps1(p);
2359 }
2360 kdb_printf("\n");
2361 /* Now the real tasks */
2362 for_each_process_thread(g, p) {
2363 if (KDB_FLAG(CMD_INTERRUPT))
2364 return 0;
2365 if (kdb_task_state(p, mask))
2366 kdb_ps1(p);
2367 }
2368
2369 return 0;
2370}
2371
2372/*
2373 * kdb_pid - This function implements the 'pid' command which switches
2374 * the currently active process.
2375 * pid [<pid> | R]
2376 */
2377static int kdb_pid(int argc, const char **argv)
2378{
2379 struct task_struct *p;
2380 unsigned long val;
2381 int diag;
2382
2383 if (argc > 1)
2384 return KDB_ARGCOUNT;
2385
2386 if (argc) {
2387 if (strcmp(argv[1], "R") == 0) {
2388 p = KDB_TSK(kdb_initial_cpu);
2389 } else {
2390 diag = kdbgetularg(argv[1], &val);
2391 if (diag)
2392 return KDB_BADINT;
2393
2394 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2395 if (!p) {
2396 kdb_printf("No task with pid=%d\n", (pid_t)val);
2397 return 0;
2398 }
2399 }
2400 kdb_set_current_task(p);
2401 }
2402 kdb_printf("KDB current process is %s(pid=%d)\n",
2403 kdb_current_task->comm,
2404 kdb_current_task->pid);
2405
2406 return 0;
2407}
2408
2409static int kdb_kgdb(int argc, const char **argv)
2410{
2411 return KDB_CMD_KGDB;
2412}
2413
2414/*
2415 * kdb_help - This function implements the 'help' and '?' commands.
2416 */
2417static int kdb_help(int argc, const char **argv)
2418{
2419 kdbtab_t *kt;
2420
2421 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2422 kdb_printf("-----------------------------"
2423 "-----------------------------\n");
2424 list_for_each_entry(kt, &kdb_cmds_head, list_node) {
2425 char *space = "";
2426 if (KDB_FLAG(CMD_INTERRUPT))
2427 return 0;
2428 if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
2429 continue;
2430 if (strlen(kt->usage) > 20)
2431 space = "\n ";
2432 kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
2433 kt->usage, space, kt->help);
2434 }
2435 return 0;
2436}
2437
2438/*
2439 * kdb_kill - This function implements the 'kill' commands.
2440 */
2441static int kdb_kill(int argc, const char **argv)
2442{
2443 long sig, pid;
2444 char *endp;
2445 struct task_struct *p;
2446
2447 if (argc != 2)
2448 return KDB_ARGCOUNT;
2449
2450 sig = simple_strtol(argv[1], &endp, 0);
2451 if (*endp)
2452 return KDB_BADINT;
2453 if ((sig >= 0) || !valid_signal(-sig)) {
2454 kdb_printf("Invalid signal parameter.<-signal>\n");
2455 return 0;
2456 }
2457 sig = -sig;
2458
2459 pid = simple_strtol(argv[2], &endp, 0);
2460 if (*endp)
2461 return KDB_BADINT;
2462 if (pid <= 0) {
2463 kdb_printf("Process ID must be large than 0.\n");
2464 return 0;
2465 }
2466
2467 /* Find the process. */
2468 p = find_task_by_pid_ns(pid, &init_pid_ns);
2469 if (!p) {
2470 kdb_printf("The specified process isn't found.\n");
2471 return 0;
2472 }
2473 p = p->group_leader;
2474 kdb_send_sig(p, sig);
2475 return 0;
2476}
2477
2478/*
2479 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2480 * I cannot call that code directly from kdb, it has an unconditional
2481 * cli()/sti() and calls routines that take locks which can stop the debugger.
2482 */
2483static void kdb_sysinfo(struct sysinfo *val)
2484{
2485 u64 uptime = ktime_get_mono_fast_ns();
2486
2487 memset(val, 0, sizeof(*val));
2488 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2489 val->loads[0] = avenrun[0];
2490 val->loads[1] = avenrun[1];
2491 val->loads[2] = avenrun[2];
2492 val->procs = nr_threads-1;
2493 si_meminfo(val);
2494
2495 return;
2496}
2497
2498/*
2499 * kdb_summary - This function implements the 'summary' command.
2500 */
2501static int kdb_summary(int argc, const char **argv)
2502{
2503 time64_t now;
2504 struct sysinfo val;
2505
2506 if (argc)
2507 return KDB_ARGCOUNT;
2508
2509 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2510 kdb_printf("release %s\n", init_uts_ns.name.release);
2511 kdb_printf("version %s\n", init_uts_ns.name.version);
2512 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2513 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2514 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2515
2516 now = __ktime_get_real_seconds();
2517 kdb_printf("date %ptTs tz_minuteswest %d\n", &now, sys_tz.tz_minuteswest);
2518 kdb_sysinfo(&val);
2519 kdb_printf("uptime ");
2520 if (val.uptime > (24*60*60)) {
2521 int days = val.uptime / (24*60*60);
2522 val.uptime %= (24*60*60);
2523 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2524 }
2525 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2526
2527 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2528 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2529 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2530 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2531
2532 /* Display in kilobytes */
2533#define K(x) ((x) << (PAGE_SHIFT - 10))
2534 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2535 "Buffers: %8lu kB\n",
2536 K(val.totalram), K(val.freeram), K(val.bufferram));
2537 return 0;
2538}
2539
2540/*
2541 * kdb_per_cpu - This function implements the 'per_cpu' command.
2542 */
2543static int kdb_per_cpu(int argc, const char **argv)
2544{
2545 char fmtstr[64];
2546 int cpu, diag, nextarg = 1;
2547 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2548
2549 if (argc < 1 || argc > 3)
2550 return KDB_ARGCOUNT;
2551
2552 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2553 if (diag)
2554 return diag;
2555
2556 if (argc >= 2) {
2557 diag = kdbgetularg(argv[2], &bytesperword);
2558 if (diag)
2559 return diag;
2560 }
2561 if (!bytesperword)
2562 bytesperword = KDB_WORD_SIZE;
2563 else if (bytesperword > KDB_WORD_SIZE)
2564 return KDB_BADWIDTH;
2565 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2566 if (argc >= 3) {
2567 diag = kdbgetularg(argv[3], &whichcpu);
2568 if (diag)
2569 return diag;
2570 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2571 kdb_printf("cpu %ld is not online\n", whichcpu);
2572 return KDB_BADCPUNUM;
2573 }
2574 }
2575
2576 /* Most architectures use __per_cpu_offset[cpu], some use
2577 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2578 */
2579#ifdef __per_cpu_offset
2580#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2581#else
2582#ifdef CONFIG_SMP
2583#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2584#else
2585#define KDB_PCU(cpu) 0
2586#endif
2587#endif
2588 for_each_online_cpu(cpu) {
2589 if (KDB_FLAG(CMD_INTERRUPT))
2590 return 0;
2591
2592 if (whichcpu != ~0UL && whichcpu != cpu)
2593 continue;
2594 addr = symaddr + KDB_PCU(cpu);
2595 diag = kdb_getword(&val, addr, bytesperword);
2596 if (diag) {
2597 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2598 "read, diag=%d\n", cpu, addr, diag);
2599 continue;
2600 }
2601 kdb_printf("%5d ", cpu);
2602 kdb_md_line(fmtstr, addr,
2603 bytesperword == KDB_WORD_SIZE,
2604 1, bytesperword, 1, 1, 0);
2605 }
2606#undef KDB_PCU
2607 return 0;
2608}
2609
2610/*
2611 * display help for the use of cmd | grep pattern
2612 */
2613static int kdb_grep_help(int argc, const char **argv)
2614{
2615 kdb_printf("Usage of cmd args | grep pattern:\n");
2616 kdb_printf(" Any command's output may be filtered through an ");
2617 kdb_printf("emulated 'pipe'.\n");
2618 kdb_printf(" 'grep' is just a key word.\n");
2619 kdb_printf(" The pattern may include a very limited set of "
2620 "metacharacters:\n");
2621 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2622 kdb_printf(" And if there are spaces in the pattern, you may "
2623 "quote it:\n");
2624 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2625 " or \"^pat tern$\"\n");
2626 return 0;
2627}
2628
2629/**
2630 * kdb_register() - This function is used to register a kernel debugger
2631 * command.
2632 * @cmd: pointer to kdb command
2633 *
2634 * Note that it's the job of the caller to keep the memory for the cmd
2635 * allocated until unregister is called.
2636 */
2637int kdb_register(kdbtab_t *cmd)
2638{
2639 kdbtab_t *kp;
2640
2641 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
2642 if (strcmp(kp->name, cmd->name) == 0) {
2643 kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
2644 cmd->name, cmd->func, cmd->help);
2645 return 1;
2646 }
2647 }
2648
2649 list_add_tail(&cmd->list_node, &kdb_cmds_head);
2650 return 0;
2651}
2652EXPORT_SYMBOL_GPL(kdb_register);
2653
2654/**
2655 * kdb_register_table() - This function is used to register a kdb command
2656 * table.
2657 * @kp: pointer to kdb command table
2658 * @len: length of kdb command table
2659 */
2660void kdb_register_table(kdbtab_t *kp, size_t len)
2661{
2662 while (len--) {
2663 list_add_tail(&kp->list_node, &kdb_cmds_head);
2664 kp++;
2665 }
2666}
2667
2668/**
2669 * kdb_unregister() - This function is used to unregister a kernel debugger
2670 * command. It is generally called when a module which
2671 * implements kdb command is unloaded.
2672 * @cmd: pointer to kdb command
2673 */
2674void kdb_unregister(kdbtab_t *cmd)
2675{
2676 list_del(&cmd->list_node);
2677}
2678EXPORT_SYMBOL_GPL(kdb_unregister);
2679
2680static kdbtab_t maintab[] = {
2681 { .name = "md",
2682 .func = kdb_md,
2683 .usage = "<vaddr>",
2684 .help = "Display Memory Contents, also mdWcN, e.g. md8c1",
2685 .minlen = 1,
2686 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2687 },
2688 { .name = "mdr",
2689 .func = kdb_md,
2690 .usage = "<vaddr> <bytes>",
2691 .help = "Display Raw Memory",
2692 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2693 },
2694 { .name = "mdp",
2695 .func = kdb_md,
2696 .usage = "<paddr> <bytes>",
2697 .help = "Display Physical Memory",
2698 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2699 },
2700 { .name = "mds",
2701 .func = kdb_md,
2702 .usage = "<vaddr>",
2703 .help = "Display Memory Symbolically",
2704 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2705 },
2706 { .name = "mm",
2707 .func = kdb_mm,
2708 .usage = "<vaddr> <contents>",
2709 .help = "Modify Memory Contents",
2710 .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
2711 },
2712 { .name = "go",
2713 .func = kdb_go,
2714 .usage = "[<vaddr>]",
2715 .help = "Continue Execution",
2716 .minlen = 1,
2717 .flags = KDB_ENABLE_REG_WRITE |
2718 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2719 },
2720 { .name = "rd",
2721 .func = kdb_rd,
2722 .usage = "",
2723 .help = "Display Registers",
2724 .flags = KDB_ENABLE_REG_READ,
2725 },
2726 { .name = "rm",
2727 .func = kdb_rm,
2728 .usage = "<reg> <contents>",
2729 .help = "Modify Registers",
2730 .flags = KDB_ENABLE_REG_WRITE,
2731 },
2732 { .name = "ef",
2733 .func = kdb_ef,
2734 .usage = "<vaddr>",
2735 .help = "Display exception frame",
2736 .flags = KDB_ENABLE_MEM_READ,
2737 },
2738 { .name = "bt",
2739 .func = kdb_bt,
2740 .usage = "[<vaddr>]",
2741 .help = "Stack traceback",
2742 .minlen = 1,
2743 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2744 },
2745 { .name = "btp",
2746 .func = kdb_bt,
2747 .usage = "<pid>",
2748 .help = "Display stack for process <pid>",
2749 .flags = KDB_ENABLE_INSPECT,
2750 },
2751 { .name = "bta",
2752 .func = kdb_bt,
2753 .usage = "[<state_chars>|A]",
2754 .help = "Backtrace all processes whose state matches",
2755 .flags = KDB_ENABLE_INSPECT,
2756 },
2757 { .name = "btc",
2758 .func = kdb_bt,
2759 .usage = "",
2760 .help = "Backtrace current process on each cpu",
2761 .flags = KDB_ENABLE_INSPECT,
2762 },
2763 { .name = "btt",
2764 .func = kdb_bt,
2765 .usage = "<vaddr>",
2766 .help = "Backtrace process given its struct task address",
2767 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2768 },
2769 { .name = "env",
2770 .func = kdb_env,
2771 .usage = "",
2772 .help = "Show environment variables",
2773 .flags = KDB_ENABLE_ALWAYS_SAFE,
2774 },
2775 { .name = "set",
2776 .func = kdb_set,
2777 .usage = "",
2778 .help = "Set environment variables",
2779 .flags = KDB_ENABLE_ALWAYS_SAFE,
2780 },
2781 { .name = "help",
2782 .func = kdb_help,
2783 .usage = "",
2784 .help = "Display Help Message",
2785 .minlen = 1,
2786 .flags = KDB_ENABLE_ALWAYS_SAFE,
2787 },
2788 { .name = "?",
2789 .func = kdb_help,
2790 .usage = "",
2791 .help = "Display Help Message",
2792 .flags = KDB_ENABLE_ALWAYS_SAFE,
2793 },
2794 { .name = "cpu",
2795 .func = kdb_cpu,
2796 .usage = "<cpunum>",
2797 .help = "Switch to new cpu",
2798 .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2799 },
2800 { .name = "kgdb",
2801 .func = kdb_kgdb,
2802 .usage = "",
2803 .help = "Enter kgdb mode",
2804 .flags = 0,
2805 },
2806 { .name = "ps",
2807 .func = kdb_ps,
2808 .usage = "[<state_chars>|A]",
2809 .help = "Display active task list",
2810 .flags = KDB_ENABLE_INSPECT,
2811 },
2812 { .name = "pid",
2813 .func = kdb_pid,
2814 .usage = "<pidnum>",
2815 .help = "Switch to another task",
2816 .flags = KDB_ENABLE_INSPECT,
2817 },
2818 { .name = "reboot",
2819 .func = kdb_reboot,
2820 .usage = "",
2821 .help = "Reboot the machine immediately",
2822 .flags = KDB_ENABLE_REBOOT,
2823 },
2824#if defined(CONFIG_MODULES)
2825 { .name = "lsmod",
2826 .func = kdb_lsmod,
2827 .usage = "",
2828 .help = "List loaded kernel modules",
2829 .flags = KDB_ENABLE_INSPECT,
2830 },
2831#endif
2832#if defined(CONFIG_MAGIC_SYSRQ)
2833 { .name = "sr",
2834 .func = kdb_sr,
2835 .usage = "<key>",
2836 .help = "Magic SysRq key",
2837 .flags = KDB_ENABLE_ALWAYS_SAFE,
2838 },
2839#endif
2840#if defined(CONFIG_PRINTK)
2841 { .name = "dmesg",
2842 .func = kdb_dmesg,
2843 .usage = "[lines]",
2844 .help = "Display syslog buffer",
2845 .flags = KDB_ENABLE_ALWAYS_SAFE,
2846 },
2847#endif
2848 { .name = "defcmd",
2849 .func = kdb_defcmd,
2850 .usage = "name \"usage\" \"help\"",
2851 .help = "Define a set of commands, down to endefcmd",
2852 /*
2853 * Macros are always safe because when executed each
2854 * internal command re-enters kdb_parse() and is safety
2855 * checked individually.
2856 */
2857 .flags = KDB_ENABLE_ALWAYS_SAFE,
2858 },
2859 { .name = "kill",
2860 .func = kdb_kill,
2861 .usage = "<-signal> <pid>",
2862 .help = "Send a signal to a process",
2863 .flags = KDB_ENABLE_SIGNAL,
2864 },
2865 { .name = "summary",
2866 .func = kdb_summary,
2867 .usage = "",
2868 .help = "Summarize the system",
2869 .minlen = 4,
2870 .flags = KDB_ENABLE_ALWAYS_SAFE,
2871 },
2872 { .name = "per_cpu",
2873 .func = kdb_per_cpu,
2874 .usage = "<sym> [<bytes>] [<cpu>]",
2875 .help = "Display per_cpu variables",
2876 .minlen = 3,
2877 .flags = KDB_ENABLE_MEM_READ,
2878 },
2879 { .name = "grephelp",
2880 .func = kdb_grep_help,
2881 .usage = "",
2882 .help = "Display help on | grep",
2883 .flags = KDB_ENABLE_ALWAYS_SAFE,
2884 },
2885};
2886
2887static kdbtab_t nmicmd = {
2888 .name = "disable_nmi",
2889 .func = kdb_disable_nmi,
2890 .usage = "",
2891 .help = "Disable NMI entry to KDB",
2892 .flags = KDB_ENABLE_ALWAYS_SAFE,
2893};
2894
2895/* Initialize the kdb command table. */
2896static void __init kdb_inittab(void)
2897{
2898 kdb_register_table(maintab, ARRAY_SIZE(maintab));
2899 if (arch_kgdb_ops.enable_nmi)
2900 kdb_register_table(&nmicmd, 1);
2901}
2902
2903/* Execute any commands defined in kdb_cmds. */
2904static void __init kdb_cmd_init(void)
2905{
2906 int i, diag;
2907 for (i = 0; kdb_cmds[i]; ++i) {
2908 diag = kdb_parse(kdb_cmds[i]);
2909 if (diag)
2910 kdb_printf("kdb command %s failed, kdb diag %d\n",
2911 kdb_cmds[i], diag);
2912 }
2913 if (defcmd_in_progress) {
2914 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2915 kdb_parse("endefcmd");
2916 }
2917}
2918
2919/* Initialize kdb_printf, breakpoint tables and kdb state */
2920void __init kdb_init(int lvl)
2921{
2922 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2923 int i;
2924
2925 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2926 return;
2927 for (i = kdb_init_lvl; i < lvl; i++) {
2928 switch (i) {
2929 case KDB_NOT_INITIALIZED:
2930 kdb_inittab(); /* Initialize Command Table */
2931 kdb_initbptab(); /* Initialize Breakpoints */
2932 break;
2933 case KDB_INIT_EARLY:
2934 kdb_cmd_init(); /* Build kdb_cmds tables */
2935 break;
2936 }
2937 }
2938 kdb_init_lvl = lvl;
2939}
1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/string.h>
16#include <linux/kernel.h>
17#include <linux/reboot.h>
18#include <linux/sched.h>
19#include <linux/sysrq.h>
20#include <linux/smp.h>
21#include <linux/utsname.h>
22#include <linux/vmalloc.h>
23#include <linux/module.h>
24#include <linux/mm.h>
25#include <linux/init.h>
26#include <linux/kallsyms.h>
27#include <linux/kgdb.h>
28#include <linux/kdb.h>
29#include <linux/notifier.h>
30#include <linux/interrupt.h>
31#include <linux/delay.h>
32#include <linux/nmi.h>
33#include <linux/time.h>
34#include <linux/ptrace.h>
35#include <linux/sysctl.h>
36#include <linux/cpu.h>
37#include <linux/kdebug.h>
38#include <linux/proc_fs.h>
39#include <linux/uaccess.h>
40#include <linux/slab.h>
41#include "kdb_private.h"
42
43#define GREP_LEN 256
44char kdb_grep_string[GREP_LEN];
45int kdb_grepping_flag;
46EXPORT_SYMBOL(kdb_grepping_flag);
47int kdb_grep_leading;
48int kdb_grep_trailing;
49
50/*
51 * Kernel debugger state flags
52 */
53int kdb_flags;
54atomic_t kdb_event;
55
56/*
57 * kdb_lock protects updates to kdb_initial_cpu. Used to
58 * single thread processors through the kernel debugger.
59 */
60int kdb_initial_cpu = -1; /* cpu number that owns kdb */
61int kdb_nextline = 1;
62int kdb_state; /* General KDB state */
63
64struct task_struct *kdb_current_task;
65EXPORT_SYMBOL(kdb_current_task);
66struct pt_regs *kdb_current_regs;
67
68const char *kdb_diemsg;
69static int kdb_go_count;
70#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
71static unsigned int kdb_continue_catastrophic =
72 CONFIG_KDB_CONTINUE_CATASTROPHIC;
73#else
74static unsigned int kdb_continue_catastrophic;
75#endif
76
77/* kdb_commands describes the available commands. */
78static kdbtab_t *kdb_commands;
79#define KDB_BASE_CMD_MAX 50
80static int kdb_max_commands = KDB_BASE_CMD_MAX;
81static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
82#define for_each_kdbcmd(cmd, num) \
83 for ((cmd) = kdb_base_commands, (num) = 0; \
84 num < kdb_max_commands; \
85 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
86
87typedef struct _kdbmsg {
88 int km_diag; /* kdb diagnostic */
89 char *km_msg; /* Corresponding message text */
90} kdbmsg_t;
91
92#define KDBMSG(msgnum, text) \
93 { KDB_##msgnum, text }
94
95static kdbmsg_t kdbmsgs[] = {
96 KDBMSG(NOTFOUND, "Command Not Found"),
97 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
98 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
99 "8 is only allowed on 64 bit systems"),
100 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
101 KDBMSG(NOTENV, "Cannot find environment variable"),
102 KDBMSG(NOENVVALUE, "Environment variable should have value"),
103 KDBMSG(NOTIMP, "Command not implemented"),
104 KDBMSG(ENVFULL, "Environment full"),
105 KDBMSG(ENVBUFFULL, "Environment buffer full"),
106 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
107#ifdef CONFIG_CPU_XSCALE
108 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
109#else
110 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
111#endif
112 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
113 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
114 KDBMSG(BADMODE, "Invalid IDMODE"),
115 KDBMSG(BADINT, "Illegal numeric value"),
116 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
117 KDBMSG(BADREG, "Invalid register name"),
118 KDBMSG(BADCPUNUM, "Invalid cpu number"),
119 KDBMSG(BADLENGTH, "Invalid length field"),
120 KDBMSG(NOBP, "No Breakpoint exists"),
121 KDBMSG(BADADDR, "Invalid address"),
122};
123#undef KDBMSG
124
125static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t);
126
127
128/*
129 * Initial environment. This is all kept static and local to
130 * this file. We don't want to rely on the memory allocation
131 * mechanisms in the kernel, so we use a very limited allocate-only
132 * heap for new and altered environment variables. The entire
133 * environment is limited to a fixed number of entries (add more
134 * to __env[] if required) and a fixed amount of heap (add more to
135 * KDB_ENVBUFSIZE if required).
136 */
137
138static char *__env[] = {
139#if defined(CONFIG_SMP)
140 "PROMPT=[%d]kdb> ",
141 "MOREPROMPT=[%d]more> ",
142#else
143 "PROMPT=kdb> ",
144 "MOREPROMPT=more> ",
145#endif
146 "RADIX=16",
147 "MDCOUNT=8", /* lines of md output */
148 KDB_PLATFORM_ENV,
149 "DTABCOUNT=30",
150 "NOSECT=1",
151 (char *)0,
152 (char *)0,
153 (char *)0,
154 (char *)0,
155 (char *)0,
156 (char *)0,
157 (char *)0,
158 (char *)0,
159 (char *)0,
160 (char *)0,
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175};
176
177static const int __nenv = (sizeof(__env) / sizeof(char *));
178
179struct task_struct *kdb_curr_task(int cpu)
180{
181 struct task_struct *p = curr_task(cpu);
182#ifdef _TIF_MCA_INIT
183 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
184 p = krp->p;
185#endif
186 return p;
187}
188
189/*
190 * kdbgetenv - This function will return the character string value of
191 * an environment variable.
192 * Parameters:
193 * match A character string representing an environment variable.
194 * Returns:
195 * NULL No environment variable matches 'match'
196 * char* Pointer to string value of environment variable.
197 */
198char *kdbgetenv(const char *match)
199{
200 char **ep = __env;
201 int matchlen = strlen(match);
202 int i;
203
204 for (i = 0; i < __nenv; i++) {
205 char *e = *ep++;
206
207 if (!e)
208 continue;
209
210 if ((strncmp(match, e, matchlen) == 0)
211 && ((e[matchlen] == '\0')
212 || (e[matchlen] == '='))) {
213 char *cp = strchr(e, '=');
214 return cp ? ++cp : "";
215 }
216 }
217 return NULL;
218}
219
220/*
221 * kdballocenv - This function is used to allocate bytes for
222 * environment entries.
223 * Parameters:
224 * match A character string representing a numeric value
225 * Outputs:
226 * *value the unsigned long representation of the env variable 'match'
227 * Returns:
228 * Zero on success, a kdb diagnostic on failure.
229 * Remarks:
230 * We use a static environment buffer (envbuffer) to hold the values
231 * of dynamically generated environment variables (see kdb_set). Buffer
232 * space once allocated is never free'd, so over time, the amount of space
233 * (currently 512 bytes) will be exhausted if env variables are changed
234 * frequently.
235 */
236static char *kdballocenv(size_t bytes)
237{
238#define KDB_ENVBUFSIZE 512
239 static char envbuffer[KDB_ENVBUFSIZE];
240 static int envbufsize;
241 char *ep = NULL;
242
243 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
244 ep = &envbuffer[envbufsize];
245 envbufsize += bytes;
246 }
247 return ep;
248}
249
250/*
251 * kdbgetulenv - This function will return the value of an unsigned
252 * long-valued environment variable.
253 * Parameters:
254 * match A character string representing a numeric value
255 * Outputs:
256 * *value the unsigned long represntation of the env variable 'match'
257 * Returns:
258 * Zero on success, a kdb diagnostic on failure.
259 */
260static int kdbgetulenv(const char *match, unsigned long *value)
261{
262 char *ep;
263
264 ep = kdbgetenv(match);
265 if (!ep)
266 return KDB_NOTENV;
267 if (strlen(ep) == 0)
268 return KDB_NOENVVALUE;
269
270 *value = simple_strtoul(ep, NULL, 0);
271
272 return 0;
273}
274
275/*
276 * kdbgetintenv - This function will return the value of an
277 * integer-valued environment variable.
278 * Parameters:
279 * match A character string representing an integer-valued env variable
280 * Outputs:
281 * *value the integer representation of the environment variable 'match'
282 * Returns:
283 * Zero on success, a kdb diagnostic on failure.
284 */
285int kdbgetintenv(const char *match, int *value)
286{
287 unsigned long val;
288 int diag;
289
290 diag = kdbgetulenv(match, &val);
291 if (!diag)
292 *value = (int) val;
293 return diag;
294}
295
296/*
297 * kdbgetularg - This function will convert a numeric string into an
298 * unsigned long value.
299 * Parameters:
300 * arg A character string representing a numeric value
301 * Outputs:
302 * *value the unsigned long represntation of arg.
303 * Returns:
304 * Zero on success, a kdb diagnostic on failure.
305 */
306int kdbgetularg(const char *arg, unsigned long *value)
307{
308 char *endp;
309 unsigned long val;
310
311 val = simple_strtoul(arg, &endp, 0);
312
313 if (endp == arg) {
314 /*
315 * Also try base 16, for us folks too lazy to type the
316 * leading 0x...
317 */
318 val = simple_strtoul(arg, &endp, 16);
319 if (endp == arg)
320 return KDB_BADINT;
321 }
322
323 *value = val;
324
325 return 0;
326}
327
328int kdbgetu64arg(const char *arg, u64 *value)
329{
330 char *endp;
331 u64 val;
332
333 val = simple_strtoull(arg, &endp, 0);
334
335 if (endp == arg) {
336
337 val = simple_strtoull(arg, &endp, 16);
338 if (endp == arg)
339 return KDB_BADINT;
340 }
341
342 *value = val;
343
344 return 0;
345}
346
347/*
348 * kdb_set - This function implements the 'set' command. Alter an
349 * existing environment variable or create a new one.
350 */
351int kdb_set(int argc, const char **argv)
352{
353 int i;
354 char *ep;
355 size_t varlen, vallen;
356
357 /*
358 * we can be invoked two ways:
359 * set var=value argv[1]="var", argv[2]="value"
360 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
361 * - if the latter, shift 'em down.
362 */
363 if (argc == 3) {
364 argv[2] = argv[3];
365 argc--;
366 }
367
368 if (argc != 2)
369 return KDB_ARGCOUNT;
370
371 /*
372 * Check for internal variables
373 */
374 if (strcmp(argv[1], "KDBDEBUG") == 0) {
375 unsigned int debugflags;
376 char *cp;
377
378 debugflags = simple_strtoul(argv[2], &cp, 0);
379 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
380 kdb_printf("kdb: illegal debug flags '%s'\n",
381 argv[2]);
382 return 0;
383 }
384 kdb_flags = (kdb_flags &
385 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
386 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
387
388 return 0;
389 }
390
391 /*
392 * Tokenizer squashed the '=' sign. argv[1] is variable
393 * name, argv[2] = value.
394 */
395 varlen = strlen(argv[1]);
396 vallen = strlen(argv[2]);
397 ep = kdballocenv(varlen + vallen + 2);
398 if (ep == (char *)0)
399 return KDB_ENVBUFFULL;
400
401 sprintf(ep, "%s=%s", argv[1], argv[2]);
402
403 ep[varlen+vallen+1] = '\0';
404
405 for (i = 0; i < __nenv; i++) {
406 if (__env[i]
407 && ((strncmp(__env[i], argv[1], varlen) == 0)
408 && ((__env[i][varlen] == '\0')
409 || (__env[i][varlen] == '=')))) {
410 __env[i] = ep;
411 return 0;
412 }
413 }
414
415 /*
416 * Wasn't existing variable. Fit into slot.
417 */
418 for (i = 0; i < __nenv-1; i++) {
419 if (__env[i] == (char *)0) {
420 __env[i] = ep;
421 return 0;
422 }
423 }
424
425 return KDB_ENVFULL;
426}
427
428static int kdb_check_regs(void)
429{
430 if (!kdb_current_regs) {
431 kdb_printf("No current kdb registers."
432 " You may need to select another task\n");
433 return KDB_BADREG;
434 }
435 return 0;
436}
437
438/*
439 * kdbgetaddrarg - This function is responsible for parsing an
440 * address-expression and returning the value of the expression,
441 * symbol name, and offset to the caller.
442 *
443 * The argument may consist of a numeric value (decimal or
444 * hexidecimal), a symbol name, a register name (preceded by the
445 * percent sign), an environment variable with a numeric value
446 * (preceded by a dollar sign) or a simple arithmetic expression
447 * consisting of a symbol name, +/-, and a numeric constant value
448 * (offset).
449 * Parameters:
450 * argc - count of arguments in argv
451 * argv - argument vector
452 * *nextarg - index to next unparsed argument in argv[]
453 * regs - Register state at time of KDB entry
454 * Outputs:
455 * *value - receives the value of the address-expression
456 * *offset - receives the offset specified, if any
457 * *name - receives the symbol name, if any
458 * *nextarg - index to next unparsed argument in argv[]
459 * Returns:
460 * zero is returned on success, a kdb diagnostic code is
461 * returned on error.
462 */
463int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
464 unsigned long *value, long *offset,
465 char **name)
466{
467 unsigned long addr;
468 unsigned long off = 0;
469 int positive;
470 int diag;
471 int found = 0;
472 char *symname;
473 char symbol = '\0';
474 char *cp;
475 kdb_symtab_t symtab;
476
477 /*
478 * Process arguments which follow the following syntax:
479 *
480 * symbol | numeric-address [+/- numeric-offset]
481 * %register
482 * $environment-variable
483 */
484
485 if (*nextarg > argc)
486 return KDB_ARGCOUNT;
487
488 symname = (char *)argv[*nextarg];
489
490 /*
491 * If there is no whitespace between the symbol
492 * or address and the '+' or '-' symbols, we
493 * remember the character and replace it with a
494 * null so the symbol/value can be properly parsed
495 */
496 cp = strpbrk(symname, "+-");
497 if (cp != NULL) {
498 symbol = *cp;
499 *cp++ = '\0';
500 }
501
502 if (symname[0] == '$') {
503 diag = kdbgetulenv(&symname[1], &addr);
504 if (diag)
505 return diag;
506 } else if (symname[0] == '%') {
507 diag = kdb_check_regs();
508 if (diag)
509 return diag;
510 /* Implement register values with % at a later time as it is
511 * arch optional.
512 */
513 return KDB_NOTIMP;
514 } else {
515 found = kdbgetsymval(symname, &symtab);
516 if (found) {
517 addr = symtab.sym_start;
518 } else {
519 diag = kdbgetularg(argv[*nextarg], &addr);
520 if (diag)
521 return diag;
522 }
523 }
524
525 if (!found)
526 found = kdbnearsym(addr, &symtab);
527
528 (*nextarg)++;
529
530 if (name)
531 *name = symname;
532 if (value)
533 *value = addr;
534 if (offset && name && *name)
535 *offset = addr - symtab.sym_start;
536
537 if ((*nextarg > argc)
538 && (symbol == '\0'))
539 return 0;
540
541 /*
542 * check for +/- and offset
543 */
544
545 if (symbol == '\0') {
546 if ((argv[*nextarg][0] != '+')
547 && (argv[*nextarg][0] != '-')) {
548 /*
549 * Not our argument. Return.
550 */
551 return 0;
552 } else {
553 positive = (argv[*nextarg][0] == '+');
554 (*nextarg)++;
555 }
556 } else
557 positive = (symbol == '+');
558
559 /*
560 * Now there must be an offset!
561 */
562 if ((*nextarg > argc)
563 && (symbol == '\0')) {
564 return KDB_INVADDRFMT;
565 }
566
567 if (!symbol) {
568 cp = (char *)argv[*nextarg];
569 (*nextarg)++;
570 }
571
572 diag = kdbgetularg(cp, &off);
573 if (diag)
574 return diag;
575
576 if (!positive)
577 off = -off;
578
579 if (offset)
580 *offset += off;
581
582 if (value)
583 *value += off;
584
585 return 0;
586}
587
588static void kdb_cmderror(int diag)
589{
590 int i;
591
592 if (diag >= 0) {
593 kdb_printf("no error detected (diagnostic is %d)\n", diag);
594 return;
595 }
596
597 for (i = 0; i < __nkdb_err; i++) {
598 if (kdbmsgs[i].km_diag == diag) {
599 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
600 return;
601 }
602 }
603
604 kdb_printf("Unknown diag %d\n", -diag);
605}
606
607/*
608 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
609 * command which defines one command as a set of other commands,
610 * terminated by endefcmd. kdb_defcmd processes the initial
611 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
612 * the following commands until 'endefcmd'.
613 * Inputs:
614 * argc argument count
615 * argv argument vector
616 * Returns:
617 * zero for success, a kdb diagnostic if error
618 */
619struct defcmd_set {
620 int count;
621 int usable;
622 char *name;
623 char *usage;
624 char *help;
625 char **command;
626};
627static struct defcmd_set *defcmd_set;
628static int defcmd_set_count;
629static int defcmd_in_progress;
630
631/* Forward references */
632static int kdb_exec_defcmd(int argc, const char **argv);
633
634static int kdb_defcmd2(const char *cmdstr, const char *argv0)
635{
636 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
637 char **save_command = s->command;
638 if (strcmp(argv0, "endefcmd") == 0) {
639 defcmd_in_progress = 0;
640 if (!s->count)
641 s->usable = 0;
642 if (s->usable)
643 kdb_register(s->name, kdb_exec_defcmd,
644 s->usage, s->help, 0);
645 return 0;
646 }
647 if (!s->usable)
648 return KDB_NOTIMP;
649 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
650 if (!s->command) {
651 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
652 cmdstr);
653 s->usable = 0;
654 return KDB_NOTIMP;
655 }
656 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
657 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
658 kfree(save_command);
659 return 0;
660}
661
662static int kdb_defcmd(int argc, const char **argv)
663{
664 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
665 if (defcmd_in_progress) {
666 kdb_printf("kdb: nested defcmd detected, assuming missing "
667 "endefcmd\n");
668 kdb_defcmd2("endefcmd", "endefcmd");
669 }
670 if (argc == 0) {
671 int i;
672 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
673 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
674 s->usage, s->help);
675 for (i = 0; i < s->count; ++i)
676 kdb_printf("%s", s->command[i]);
677 kdb_printf("endefcmd\n");
678 }
679 return 0;
680 }
681 if (argc != 3)
682 return KDB_ARGCOUNT;
683 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
684 GFP_KDB);
685 if (!defcmd_set) {
686 kdb_printf("Could not allocate new defcmd_set entry for %s\n",
687 argv[1]);
688 defcmd_set = save_defcmd_set;
689 return KDB_NOTIMP;
690 }
691 memcpy(defcmd_set, save_defcmd_set,
692 defcmd_set_count * sizeof(*defcmd_set));
693 kfree(save_defcmd_set);
694 s = defcmd_set + defcmd_set_count;
695 memset(s, 0, sizeof(*s));
696 s->usable = 1;
697 s->name = kdb_strdup(argv[1], GFP_KDB);
698 s->usage = kdb_strdup(argv[2], GFP_KDB);
699 s->help = kdb_strdup(argv[3], GFP_KDB);
700 if (s->usage[0] == '"') {
701 strcpy(s->usage, s->usage+1);
702 s->usage[strlen(s->usage)-1] = '\0';
703 }
704 if (s->help[0] == '"') {
705 strcpy(s->help, s->help+1);
706 s->help[strlen(s->help)-1] = '\0';
707 }
708 ++defcmd_set_count;
709 defcmd_in_progress = 1;
710 return 0;
711}
712
713/*
714 * kdb_exec_defcmd - Execute the set of commands associated with this
715 * defcmd name.
716 * Inputs:
717 * argc argument count
718 * argv argument vector
719 * Returns:
720 * zero for success, a kdb diagnostic if error
721 */
722static int kdb_exec_defcmd(int argc, const char **argv)
723{
724 int i, ret;
725 struct defcmd_set *s;
726 if (argc != 0)
727 return KDB_ARGCOUNT;
728 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
729 if (strcmp(s->name, argv[0]) == 0)
730 break;
731 }
732 if (i == defcmd_set_count) {
733 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
734 argv[0]);
735 return KDB_NOTIMP;
736 }
737 for (i = 0; i < s->count; ++i) {
738 /* Recursive use of kdb_parse, do not use argv after
739 * this point */
740 argv = NULL;
741 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
742 ret = kdb_parse(s->command[i]);
743 if (ret)
744 return ret;
745 }
746 return 0;
747}
748
749/* Command history */
750#define KDB_CMD_HISTORY_COUNT 32
751#define CMD_BUFLEN 200 /* kdb_printf: max printline
752 * size == 256 */
753static unsigned int cmd_head, cmd_tail;
754static unsigned int cmdptr;
755static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
756static char cmd_cur[CMD_BUFLEN];
757
758/*
759 * The "str" argument may point to something like | grep xyz
760 */
761static void parse_grep(const char *str)
762{
763 int len;
764 char *cp = (char *)str, *cp2;
765
766 /* sanity check: we should have been called with the \ first */
767 if (*cp != '|')
768 return;
769 cp++;
770 while (isspace(*cp))
771 cp++;
772 if (strncmp(cp, "grep ", 5)) {
773 kdb_printf("invalid 'pipe', see grephelp\n");
774 return;
775 }
776 cp += 5;
777 while (isspace(*cp))
778 cp++;
779 cp2 = strchr(cp, '\n');
780 if (cp2)
781 *cp2 = '\0'; /* remove the trailing newline */
782 len = strlen(cp);
783 if (len == 0) {
784 kdb_printf("invalid 'pipe', see grephelp\n");
785 return;
786 }
787 /* now cp points to a nonzero length search string */
788 if (*cp == '"') {
789 /* allow it be "x y z" by removing the "'s - there must
790 be two of them */
791 cp++;
792 cp2 = strchr(cp, '"');
793 if (!cp2) {
794 kdb_printf("invalid quoted string, see grephelp\n");
795 return;
796 }
797 *cp2 = '\0'; /* end the string where the 2nd " was */
798 }
799 kdb_grep_leading = 0;
800 if (*cp == '^') {
801 kdb_grep_leading = 1;
802 cp++;
803 }
804 len = strlen(cp);
805 kdb_grep_trailing = 0;
806 if (*(cp+len-1) == '$') {
807 kdb_grep_trailing = 1;
808 *(cp+len-1) = '\0';
809 }
810 len = strlen(cp);
811 if (!len)
812 return;
813 if (len >= GREP_LEN) {
814 kdb_printf("search string too long\n");
815 return;
816 }
817 strcpy(kdb_grep_string, cp);
818 kdb_grepping_flag++;
819 return;
820}
821
822/*
823 * kdb_parse - Parse the command line, search the command table for a
824 * matching command and invoke the command function. This
825 * function may be called recursively, if it is, the second call
826 * will overwrite argv and cbuf. It is the caller's
827 * responsibility to save their argv if they recursively call
828 * kdb_parse().
829 * Parameters:
830 * cmdstr The input command line to be parsed.
831 * regs The registers at the time kdb was entered.
832 * Returns:
833 * Zero for success, a kdb diagnostic if failure.
834 * Remarks:
835 * Limited to 20 tokens.
836 *
837 * Real rudimentary tokenization. Basically only whitespace
838 * is considered a token delimeter (but special consideration
839 * is taken of the '=' sign as used by the 'set' command).
840 *
841 * The algorithm used to tokenize the input string relies on
842 * there being at least one whitespace (or otherwise useless)
843 * character between tokens as the character immediately following
844 * the token is altered in-place to a null-byte to terminate the
845 * token string.
846 */
847
848#define MAXARGC 20
849
850int kdb_parse(const char *cmdstr)
851{
852 static char *argv[MAXARGC];
853 static int argc;
854 static char cbuf[CMD_BUFLEN+2];
855 char *cp;
856 char *cpp, quoted;
857 kdbtab_t *tp;
858 int i, escaped, ignore_errors = 0, check_grep;
859
860 /*
861 * First tokenize the command string.
862 */
863 cp = (char *)cmdstr;
864 kdb_grepping_flag = check_grep = 0;
865
866 if (KDB_FLAG(CMD_INTERRUPT)) {
867 /* Previous command was interrupted, newline must not
868 * repeat the command */
869 KDB_FLAG_CLEAR(CMD_INTERRUPT);
870 KDB_STATE_SET(PAGER);
871 argc = 0; /* no repeat */
872 }
873
874 if (*cp != '\n' && *cp != '\0') {
875 argc = 0;
876 cpp = cbuf;
877 while (*cp) {
878 /* skip whitespace */
879 while (isspace(*cp))
880 cp++;
881 if ((*cp == '\0') || (*cp == '\n') ||
882 (*cp == '#' && !defcmd_in_progress))
883 break;
884 /* special case: check for | grep pattern */
885 if (*cp == '|') {
886 check_grep++;
887 break;
888 }
889 if (cpp >= cbuf + CMD_BUFLEN) {
890 kdb_printf("kdb_parse: command buffer "
891 "overflow, command ignored\n%s\n",
892 cmdstr);
893 return KDB_NOTFOUND;
894 }
895 if (argc >= MAXARGC - 1) {
896 kdb_printf("kdb_parse: too many arguments, "
897 "command ignored\n%s\n", cmdstr);
898 return KDB_NOTFOUND;
899 }
900 argv[argc++] = cpp;
901 escaped = 0;
902 quoted = '\0';
903 /* Copy to next unquoted and unescaped
904 * whitespace or '=' */
905 while (*cp && *cp != '\n' &&
906 (escaped || quoted || !isspace(*cp))) {
907 if (cpp >= cbuf + CMD_BUFLEN)
908 break;
909 if (escaped) {
910 escaped = 0;
911 *cpp++ = *cp++;
912 continue;
913 }
914 if (*cp == '\\') {
915 escaped = 1;
916 ++cp;
917 continue;
918 }
919 if (*cp == quoted)
920 quoted = '\0';
921 else if (*cp == '\'' || *cp == '"')
922 quoted = *cp;
923 *cpp = *cp++;
924 if (*cpp == '=' && !quoted)
925 break;
926 ++cpp;
927 }
928 *cpp++ = '\0'; /* Squash a ws or '=' character */
929 }
930 }
931 if (!argc)
932 return 0;
933 if (check_grep)
934 parse_grep(cp);
935 if (defcmd_in_progress) {
936 int result = kdb_defcmd2(cmdstr, argv[0]);
937 if (!defcmd_in_progress) {
938 argc = 0; /* avoid repeat on endefcmd */
939 *(argv[0]) = '\0';
940 }
941 return result;
942 }
943 if (argv[0][0] == '-' && argv[0][1] &&
944 (argv[0][1] < '0' || argv[0][1] > '9')) {
945 ignore_errors = 1;
946 ++argv[0];
947 }
948
949 for_each_kdbcmd(tp, i) {
950 if (tp->cmd_name) {
951 /*
952 * If this command is allowed to be abbreviated,
953 * check to see if this is it.
954 */
955
956 if (tp->cmd_minlen
957 && (strlen(argv[0]) <= tp->cmd_minlen)) {
958 if (strncmp(argv[0],
959 tp->cmd_name,
960 tp->cmd_minlen) == 0) {
961 break;
962 }
963 }
964
965 if (strcmp(argv[0], tp->cmd_name) == 0)
966 break;
967 }
968 }
969
970 /*
971 * If we don't find a command by this name, see if the first
972 * few characters of this match any of the known commands.
973 * e.g., md1c20 should match md.
974 */
975 if (i == kdb_max_commands) {
976 for_each_kdbcmd(tp, i) {
977 if (tp->cmd_name) {
978 if (strncmp(argv[0],
979 tp->cmd_name,
980 strlen(tp->cmd_name)) == 0) {
981 break;
982 }
983 }
984 }
985 }
986
987 if (i < kdb_max_commands) {
988 int result;
989 KDB_STATE_SET(CMD);
990 result = (*tp->cmd_func)(argc-1, (const char **)argv);
991 if (result && ignore_errors && result > KDB_CMD_GO)
992 result = 0;
993 KDB_STATE_CLEAR(CMD);
994 switch (tp->cmd_repeat) {
995 case KDB_REPEAT_NONE:
996 argc = 0;
997 if (argv[0])
998 *(argv[0]) = '\0';
999 break;
1000 case KDB_REPEAT_NO_ARGS:
1001 argc = 1;
1002 if (argv[1])
1003 *(argv[1]) = '\0';
1004 break;
1005 case KDB_REPEAT_WITH_ARGS:
1006 break;
1007 }
1008 return result;
1009 }
1010
1011 /*
1012 * If the input with which we were presented does not
1013 * map to an existing command, attempt to parse it as an
1014 * address argument and display the result. Useful for
1015 * obtaining the address of a variable, or the nearest symbol
1016 * to an address contained in a register.
1017 */
1018 {
1019 unsigned long value;
1020 char *name = NULL;
1021 long offset;
1022 int nextarg = 0;
1023
1024 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1025 &value, &offset, &name)) {
1026 return KDB_NOTFOUND;
1027 }
1028
1029 kdb_printf("%s = ", argv[0]);
1030 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1031 kdb_printf("\n");
1032 return 0;
1033 }
1034}
1035
1036
1037static int handle_ctrl_cmd(char *cmd)
1038{
1039#define CTRL_P 16
1040#define CTRL_N 14
1041
1042 /* initial situation */
1043 if (cmd_head == cmd_tail)
1044 return 0;
1045 switch (*cmd) {
1046 case CTRL_P:
1047 if (cmdptr != cmd_tail)
1048 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1049 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1050 return 1;
1051 case CTRL_N:
1052 if (cmdptr != cmd_head)
1053 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1054 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1055 return 1;
1056 }
1057 return 0;
1058}
1059
1060/*
1061 * kdb_reboot - This function implements the 'reboot' command. Reboot
1062 * the system immediately, or loop for ever on failure.
1063 */
1064static int kdb_reboot(int argc, const char **argv)
1065{
1066 emergency_restart();
1067 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1068 while (1)
1069 cpu_relax();
1070 /* NOTREACHED */
1071 return 0;
1072}
1073
1074static void kdb_dumpregs(struct pt_regs *regs)
1075{
1076 int old_lvl = console_loglevel;
1077 console_loglevel = 15;
1078 kdb_trap_printk++;
1079 show_regs(regs);
1080 kdb_trap_printk--;
1081 kdb_printf("\n");
1082 console_loglevel = old_lvl;
1083}
1084
1085void kdb_set_current_task(struct task_struct *p)
1086{
1087 kdb_current_task = p;
1088
1089 if (kdb_task_has_cpu(p)) {
1090 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1091 return;
1092 }
1093 kdb_current_regs = NULL;
1094}
1095
1096/*
1097 * kdb_local - The main code for kdb. This routine is invoked on a
1098 * specific processor, it is not global. The main kdb() routine
1099 * ensures that only one processor at a time is in this routine.
1100 * This code is called with the real reason code on the first
1101 * entry to a kdb session, thereafter it is called with reason
1102 * SWITCH, even if the user goes back to the original cpu.
1103 * Inputs:
1104 * reason The reason KDB was invoked
1105 * error The hardware-defined error code
1106 * regs The exception frame at time of fault/breakpoint.
1107 * db_result Result code from the break or debug point.
1108 * Returns:
1109 * 0 KDB was invoked for an event which it wasn't responsible
1110 * 1 KDB handled the event for which it was invoked.
1111 * KDB_CMD_GO User typed 'go'.
1112 * KDB_CMD_CPU User switched to another cpu.
1113 * KDB_CMD_SS Single step.
1114 * KDB_CMD_SSB Single step until branch.
1115 */
1116static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1117 kdb_dbtrap_t db_result)
1118{
1119 char *cmdbuf;
1120 int diag;
1121 struct task_struct *kdb_current =
1122 kdb_curr_task(raw_smp_processor_id());
1123
1124 KDB_DEBUG_STATE("kdb_local 1", reason);
1125 kdb_go_count = 0;
1126 if (reason == KDB_REASON_DEBUG) {
1127 /* special case below */
1128 } else {
1129 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1130 kdb_current, kdb_current ? kdb_current->pid : 0);
1131#if defined(CONFIG_SMP)
1132 kdb_printf("on processor %d ", raw_smp_processor_id());
1133#endif
1134 }
1135
1136 switch (reason) {
1137 case KDB_REASON_DEBUG:
1138 {
1139 /*
1140 * If re-entering kdb after a single step
1141 * command, don't print the message.
1142 */
1143 switch (db_result) {
1144 case KDB_DB_BPT:
1145 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1146 kdb_current, kdb_current->pid);
1147#if defined(CONFIG_SMP)
1148 kdb_printf("on processor %d ", raw_smp_processor_id());
1149#endif
1150 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1151 instruction_pointer(regs));
1152 break;
1153 case KDB_DB_SSB:
1154 /*
1155 * In the midst of ssb command. Just return.
1156 */
1157 KDB_DEBUG_STATE("kdb_local 3", reason);
1158 return KDB_CMD_SSB; /* Continue with SSB command */
1159
1160 break;
1161 case KDB_DB_SS:
1162 break;
1163 case KDB_DB_SSBPT:
1164 KDB_DEBUG_STATE("kdb_local 4", reason);
1165 return 1; /* kdba_db_trap did the work */
1166 default:
1167 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1168 db_result);
1169 break;
1170 }
1171
1172 }
1173 break;
1174 case KDB_REASON_ENTER:
1175 if (KDB_STATE(KEYBOARD))
1176 kdb_printf("due to Keyboard Entry\n");
1177 else
1178 kdb_printf("due to KDB_ENTER()\n");
1179 break;
1180 case KDB_REASON_KEYBOARD:
1181 KDB_STATE_SET(KEYBOARD);
1182 kdb_printf("due to Keyboard Entry\n");
1183 break;
1184 case KDB_REASON_ENTER_SLAVE:
1185 /* drop through, slaves only get released via cpu switch */
1186 case KDB_REASON_SWITCH:
1187 kdb_printf("due to cpu switch\n");
1188 break;
1189 case KDB_REASON_OOPS:
1190 kdb_printf("Oops: %s\n", kdb_diemsg);
1191 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1192 instruction_pointer(regs));
1193 kdb_dumpregs(regs);
1194 break;
1195 case KDB_REASON_NMI:
1196 kdb_printf("due to NonMaskable Interrupt @ "
1197 kdb_machreg_fmt "\n",
1198 instruction_pointer(regs));
1199 kdb_dumpregs(regs);
1200 break;
1201 case KDB_REASON_SSTEP:
1202 case KDB_REASON_BREAK:
1203 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1204 reason == KDB_REASON_BREAK ?
1205 "Breakpoint" : "SS trap", instruction_pointer(regs));
1206 /*
1207 * Determine if this breakpoint is one that we
1208 * are interested in.
1209 */
1210 if (db_result != KDB_DB_BPT) {
1211 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1212 db_result);
1213 KDB_DEBUG_STATE("kdb_local 6", reason);
1214 return 0; /* Not for us, dismiss it */
1215 }
1216 break;
1217 case KDB_REASON_RECURSE:
1218 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1219 instruction_pointer(regs));
1220 break;
1221 default:
1222 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1223 KDB_DEBUG_STATE("kdb_local 8", reason);
1224 return 0; /* Not for us, dismiss it */
1225 }
1226
1227 while (1) {
1228 /*
1229 * Initialize pager context.
1230 */
1231 kdb_nextline = 1;
1232 KDB_STATE_CLEAR(SUPPRESS);
1233
1234 cmdbuf = cmd_cur;
1235 *cmdbuf = '\0';
1236 *(cmd_hist[cmd_head]) = '\0';
1237
1238 if (KDB_FLAG(ONLY_DO_DUMP)) {
1239 /* kdb is off but a catastrophic error requires a dump.
1240 * Take the dump and reboot.
1241 * Turn on logging so the kdb output appears in the log
1242 * buffer in the dump.
1243 */
1244 const char *setargs[] = { "set", "LOGGING", "1" };
1245 kdb_set(2, setargs);
1246 kdb_reboot(0, NULL);
1247 /*NOTREACHED*/
1248 }
1249
1250do_full_getstr:
1251#if defined(CONFIG_SMP)
1252 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1253 raw_smp_processor_id());
1254#else
1255 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1256#endif
1257 if (defcmd_in_progress)
1258 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1259
1260 /*
1261 * Fetch command from keyboard
1262 */
1263 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1264 if (*cmdbuf != '\n') {
1265 if (*cmdbuf < 32) {
1266 if (cmdptr == cmd_head) {
1267 strncpy(cmd_hist[cmd_head], cmd_cur,
1268 CMD_BUFLEN);
1269 *(cmd_hist[cmd_head] +
1270 strlen(cmd_hist[cmd_head])-1) = '\0';
1271 }
1272 if (!handle_ctrl_cmd(cmdbuf))
1273 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1274 cmdbuf = cmd_cur;
1275 goto do_full_getstr;
1276 } else {
1277 strncpy(cmd_hist[cmd_head], cmd_cur,
1278 CMD_BUFLEN);
1279 }
1280
1281 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1282 if (cmd_head == cmd_tail)
1283 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1284 }
1285
1286 cmdptr = cmd_head;
1287 diag = kdb_parse(cmdbuf);
1288 if (diag == KDB_NOTFOUND) {
1289 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1290 diag = 0;
1291 }
1292 if (diag == KDB_CMD_GO
1293 || diag == KDB_CMD_CPU
1294 || diag == KDB_CMD_SS
1295 || diag == KDB_CMD_SSB
1296 || diag == KDB_CMD_KGDB)
1297 break;
1298
1299 if (diag)
1300 kdb_cmderror(diag);
1301 }
1302 KDB_DEBUG_STATE("kdb_local 9", diag);
1303 return diag;
1304}
1305
1306
1307/*
1308 * kdb_print_state - Print the state data for the current processor
1309 * for debugging.
1310 * Inputs:
1311 * text Identifies the debug point
1312 * value Any integer value to be printed, e.g. reason code.
1313 */
1314void kdb_print_state(const char *text, int value)
1315{
1316 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1317 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1318 kdb_state);
1319}
1320
1321/*
1322 * kdb_main_loop - After initial setup and assignment of the
1323 * controlling cpu, all cpus are in this loop. One cpu is in
1324 * control and will issue the kdb prompt, the others will spin
1325 * until 'go' or cpu switch.
1326 *
1327 * To get a consistent view of the kernel stacks for all
1328 * processes, this routine is invoked from the main kdb code via
1329 * an architecture specific routine. kdba_main_loop is
1330 * responsible for making the kernel stacks consistent for all
1331 * processes, there should be no difference between a blocked
1332 * process and a running process as far as kdb is concerned.
1333 * Inputs:
1334 * reason The reason KDB was invoked
1335 * error The hardware-defined error code
1336 * reason2 kdb's current reason code.
1337 * Initially error but can change
1338 * according to kdb state.
1339 * db_result Result code from break or debug point.
1340 * regs The exception frame at time of fault/breakpoint.
1341 * should always be valid.
1342 * Returns:
1343 * 0 KDB was invoked for an event which it wasn't responsible
1344 * 1 KDB handled the event for which it was invoked.
1345 */
1346int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1347 kdb_dbtrap_t db_result, struct pt_regs *regs)
1348{
1349 int result = 1;
1350 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1351 while (1) {
1352 /*
1353 * All processors except the one that is in control
1354 * will spin here.
1355 */
1356 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1357 while (KDB_STATE(HOLD_CPU)) {
1358 /* state KDB is turned off by kdb_cpu to see if the
1359 * other cpus are still live, each cpu in this loop
1360 * turns it back on.
1361 */
1362 if (!KDB_STATE(KDB))
1363 KDB_STATE_SET(KDB);
1364 }
1365
1366 KDB_STATE_CLEAR(SUPPRESS);
1367 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1368 if (KDB_STATE(LEAVING))
1369 break; /* Another cpu said 'go' */
1370 /* Still using kdb, this processor is in control */
1371 result = kdb_local(reason2, error, regs, db_result);
1372 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1373
1374 if (result == KDB_CMD_CPU)
1375 break;
1376
1377 if (result == KDB_CMD_SS) {
1378 KDB_STATE_SET(DOING_SS);
1379 break;
1380 }
1381
1382 if (result == KDB_CMD_SSB) {
1383 KDB_STATE_SET(DOING_SS);
1384 KDB_STATE_SET(DOING_SSB);
1385 break;
1386 }
1387
1388 if (result == KDB_CMD_KGDB) {
1389 if (!KDB_STATE(DOING_KGDB))
1390 kdb_printf("Entering please attach debugger "
1391 "or use $D#44+ or $3#33\n");
1392 break;
1393 }
1394 if (result && result != 1 && result != KDB_CMD_GO)
1395 kdb_printf("\nUnexpected kdb_local return code %d\n",
1396 result);
1397 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1398 break;
1399 }
1400 if (KDB_STATE(DOING_SS))
1401 KDB_STATE_CLEAR(SSBPT);
1402
1403 return result;
1404}
1405
1406/*
1407 * kdb_mdr - This function implements the guts of the 'mdr', memory
1408 * read command.
1409 * mdr <addr arg>,<byte count>
1410 * Inputs:
1411 * addr Start address
1412 * count Number of bytes
1413 * Returns:
1414 * Always 0. Any errors are detected and printed by kdb_getarea.
1415 */
1416static int kdb_mdr(unsigned long addr, unsigned int count)
1417{
1418 unsigned char c;
1419 while (count--) {
1420 if (kdb_getarea(c, addr))
1421 return 0;
1422 kdb_printf("%02x", c);
1423 addr++;
1424 }
1425 kdb_printf("\n");
1426 return 0;
1427}
1428
1429/*
1430 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1431 * 'md8' 'mdr' and 'mds' commands.
1432 *
1433 * md|mds [<addr arg> [<line count> [<radix>]]]
1434 * mdWcN [<addr arg> [<line count> [<radix>]]]
1435 * where W = is the width (1, 2, 4 or 8) and N is the count.
1436 * for eg., md1c20 reads 20 bytes, 1 at a time.
1437 * mdr <addr arg>,<byte count>
1438 */
1439static void kdb_md_line(const char *fmtstr, unsigned long addr,
1440 int symbolic, int nosect, int bytesperword,
1441 int num, int repeat, int phys)
1442{
1443 /* print just one line of data */
1444 kdb_symtab_t symtab;
1445 char cbuf[32];
1446 char *c = cbuf;
1447 int i;
1448 unsigned long word;
1449
1450 memset(cbuf, '\0', sizeof(cbuf));
1451 if (phys)
1452 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1453 else
1454 kdb_printf(kdb_machreg_fmt0 " ", addr);
1455
1456 for (i = 0; i < num && repeat--; i++) {
1457 if (phys) {
1458 if (kdb_getphysword(&word, addr, bytesperword))
1459 break;
1460 } else if (kdb_getword(&word, addr, bytesperword))
1461 break;
1462 kdb_printf(fmtstr, word);
1463 if (symbolic)
1464 kdbnearsym(word, &symtab);
1465 else
1466 memset(&symtab, 0, sizeof(symtab));
1467 if (symtab.sym_name) {
1468 kdb_symbol_print(word, &symtab, 0);
1469 if (!nosect) {
1470 kdb_printf("\n");
1471 kdb_printf(" %s %s "
1472 kdb_machreg_fmt " "
1473 kdb_machreg_fmt " "
1474 kdb_machreg_fmt, symtab.mod_name,
1475 symtab.sec_name, symtab.sec_start,
1476 symtab.sym_start, symtab.sym_end);
1477 }
1478 addr += bytesperword;
1479 } else {
1480 union {
1481 u64 word;
1482 unsigned char c[8];
1483 } wc;
1484 unsigned char *cp;
1485#ifdef __BIG_ENDIAN
1486 cp = wc.c + 8 - bytesperword;
1487#else
1488 cp = wc.c;
1489#endif
1490 wc.word = word;
1491#define printable_char(c) \
1492 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1493 switch (bytesperword) {
1494 case 8:
1495 *c++ = printable_char(*cp++);
1496 *c++ = printable_char(*cp++);
1497 *c++ = printable_char(*cp++);
1498 *c++ = printable_char(*cp++);
1499 addr += 4;
1500 case 4:
1501 *c++ = printable_char(*cp++);
1502 *c++ = printable_char(*cp++);
1503 addr += 2;
1504 case 2:
1505 *c++ = printable_char(*cp++);
1506 addr++;
1507 case 1:
1508 *c++ = printable_char(*cp++);
1509 addr++;
1510 break;
1511 }
1512#undef printable_char
1513 }
1514 }
1515 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1516 " ", cbuf);
1517}
1518
1519static int kdb_md(int argc, const char **argv)
1520{
1521 static unsigned long last_addr;
1522 static int last_radix, last_bytesperword, last_repeat;
1523 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1524 int nosect = 0;
1525 char fmtchar, fmtstr[64];
1526 unsigned long addr;
1527 unsigned long word;
1528 long offset = 0;
1529 int symbolic = 0;
1530 int valid = 0;
1531 int phys = 0;
1532
1533 kdbgetintenv("MDCOUNT", &mdcount);
1534 kdbgetintenv("RADIX", &radix);
1535 kdbgetintenv("BYTESPERWORD", &bytesperword);
1536
1537 /* Assume 'md <addr>' and start with environment values */
1538 repeat = mdcount * 16 / bytesperword;
1539
1540 if (strcmp(argv[0], "mdr") == 0) {
1541 if (argc != 2)
1542 return KDB_ARGCOUNT;
1543 valid = 1;
1544 } else if (isdigit(argv[0][2])) {
1545 bytesperword = (int)(argv[0][2] - '0');
1546 if (bytesperword == 0) {
1547 bytesperword = last_bytesperword;
1548 if (bytesperword == 0)
1549 bytesperword = 4;
1550 }
1551 last_bytesperword = bytesperword;
1552 repeat = mdcount * 16 / bytesperword;
1553 if (!argv[0][3])
1554 valid = 1;
1555 else if (argv[0][3] == 'c' && argv[0][4]) {
1556 char *p;
1557 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1558 mdcount = ((repeat * bytesperword) + 15) / 16;
1559 valid = !*p;
1560 }
1561 last_repeat = repeat;
1562 } else if (strcmp(argv[0], "md") == 0)
1563 valid = 1;
1564 else if (strcmp(argv[0], "mds") == 0)
1565 valid = 1;
1566 else if (strcmp(argv[0], "mdp") == 0) {
1567 phys = valid = 1;
1568 }
1569 if (!valid)
1570 return KDB_NOTFOUND;
1571
1572 if (argc == 0) {
1573 if (last_addr == 0)
1574 return KDB_ARGCOUNT;
1575 addr = last_addr;
1576 radix = last_radix;
1577 bytesperword = last_bytesperword;
1578 repeat = last_repeat;
1579 mdcount = ((repeat * bytesperword) + 15) / 16;
1580 }
1581
1582 if (argc) {
1583 unsigned long val;
1584 int diag, nextarg = 1;
1585 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1586 &offset, NULL);
1587 if (diag)
1588 return diag;
1589 if (argc > nextarg+2)
1590 return KDB_ARGCOUNT;
1591
1592 if (argc >= nextarg) {
1593 diag = kdbgetularg(argv[nextarg], &val);
1594 if (!diag) {
1595 mdcount = (int) val;
1596 repeat = mdcount * 16 / bytesperword;
1597 }
1598 }
1599 if (argc >= nextarg+1) {
1600 diag = kdbgetularg(argv[nextarg+1], &val);
1601 if (!diag)
1602 radix = (int) val;
1603 }
1604 }
1605
1606 if (strcmp(argv[0], "mdr") == 0)
1607 return kdb_mdr(addr, mdcount);
1608
1609 switch (radix) {
1610 case 10:
1611 fmtchar = 'd';
1612 break;
1613 case 16:
1614 fmtchar = 'x';
1615 break;
1616 case 8:
1617 fmtchar = 'o';
1618 break;
1619 default:
1620 return KDB_BADRADIX;
1621 }
1622
1623 last_radix = radix;
1624
1625 if (bytesperword > KDB_WORD_SIZE)
1626 return KDB_BADWIDTH;
1627
1628 switch (bytesperword) {
1629 case 8:
1630 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1631 break;
1632 case 4:
1633 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1634 break;
1635 case 2:
1636 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1637 break;
1638 case 1:
1639 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1640 break;
1641 default:
1642 return KDB_BADWIDTH;
1643 }
1644
1645 last_repeat = repeat;
1646 last_bytesperword = bytesperword;
1647
1648 if (strcmp(argv[0], "mds") == 0) {
1649 symbolic = 1;
1650 /* Do not save these changes as last_*, they are temporary mds
1651 * overrides.
1652 */
1653 bytesperword = KDB_WORD_SIZE;
1654 repeat = mdcount;
1655 kdbgetintenv("NOSECT", &nosect);
1656 }
1657
1658 /* Round address down modulo BYTESPERWORD */
1659
1660 addr &= ~(bytesperword-1);
1661
1662 while (repeat > 0) {
1663 unsigned long a;
1664 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1665
1666 if (KDB_FLAG(CMD_INTERRUPT))
1667 return 0;
1668 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1669 if (phys) {
1670 if (kdb_getphysword(&word, a, bytesperword)
1671 || word)
1672 break;
1673 } else if (kdb_getword(&word, a, bytesperword) || word)
1674 break;
1675 }
1676 n = min(num, repeat);
1677 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1678 num, repeat, phys);
1679 addr += bytesperword * n;
1680 repeat -= n;
1681 z = (z + num - 1) / num;
1682 if (z > 2) {
1683 int s = num * (z-2);
1684 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1685 " zero suppressed\n",
1686 addr, addr + bytesperword * s - 1);
1687 addr += bytesperword * s;
1688 repeat -= s;
1689 }
1690 }
1691 last_addr = addr;
1692
1693 return 0;
1694}
1695
1696/*
1697 * kdb_mm - This function implements the 'mm' command.
1698 * mm address-expression new-value
1699 * Remarks:
1700 * mm works on machine words, mmW works on bytes.
1701 */
1702static int kdb_mm(int argc, const char **argv)
1703{
1704 int diag;
1705 unsigned long addr;
1706 long offset = 0;
1707 unsigned long contents;
1708 int nextarg;
1709 int width;
1710
1711 if (argv[0][2] && !isdigit(argv[0][2]))
1712 return KDB_NOTFOUND;
1713
1714 if (argc < 2)
1715 return KDB_ARGCOUNT;
1716
1717 nextarg = 1;
1718 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1719 if (diag)
1720 return diag;
1721
1722 if (nextarg > argc)
1723 return KDB_ARGCOUNT;
1724 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1725 if (diag)
1726 return diag;
1727
1728 if (nextarg != argc + 1)
1729 return KDB_ARGCOUNT;
1730
1731 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1732 diag = kdb_putword(addr, contents, width);
1733 if (diag)
1734 return diag;
1735
1736 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1737
1738 return 0;
1739}
1740
1741/*
1742 * kdb_go - This function implements the 'go' command.
1743 * go [address-expression]
1744 */
1745static int kdb_go(int argc, const char **argv)
1746{
1747 unsigned long addr;
1748 int diag;
1749 int nextarg;
1750 long offset;
1751
1752 if (raw_smp_processor_id() != kdb_initial_cpu) {
1753 kdb_printf("go must execute on the entry cpu, "
1754 "please use \"cpu %d\" and then execute go\n",
1755 kdb_initial_cpu);
1756 return KDB_BADCPUNUM;
1757 }
1758 if (argc == 1) {
1759 nextarg = 1;
1760 diag = kdbgetaddrarg(argc, argv, &nextarg,
1761 &addr, &offset, NULL);
1762 if (diag)
1763 return diag;
1764 } else if (argc) {
1765 return KDB_ARGCOUNT;
1766 }
1767
1768 diag = KDB_CMD_GO;
1769 if (KDB_FLAG(CATASTROPHIC)) {
1770 kdb_printf("Catastrophic error detected\n");
1771 kdb_printf("kdb_continue_catastrophic=%d, ",
1772 kdb_continue_catastrophic);
1773 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1774 kdb_printf("type go a second time if you really want "
1775 "to continue\n");
1776 return 0;
1777 }
1778 if (kdb_continue_catastrophic == 2) {
1779 kdb_printf("forcing reboot\n");
1780 kdb_reboot(0, NULL);
1781 }
1782 kdb_printf("attempting to continue\n");
1783 }
1784 return diag;
1785}
1786
1787/*
1788 * kdb_rd - This function implements the 'rd' command.
1789 */
1790static int kdb_rd(int argc, const char **argv)
1791{
1792 int len = kdb_check_regs();
1793#if DBG_MAX_REG_NUM > 0
1794 int i;
1795 char *rname;
1796 int rsize;
1797 u64 reg64;
1798 u32 reg32;
1799 u16 reg16;
1800 u8 reg8;
1801
1802 if (len)
1803 return len;
1804
1805 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1806 rsize = dbg_reg_def[i].size * 2;
1807 if (rsize > 16)
1808 rsize = 2;
1809 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1810 len = 0;
1811 kdb_printf("\n");
1812 }
1813 if (len)
1814 len += kdb_printf(" ");
1815 switch(dbg_reg_def[i].size * 8) {
1816 case 8:
1817 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1818 if (!rname)
1819 break;
1820 len += kdb_printf("%s: %02x", rname, reg8);
1821 break;
1822 case 16:
1823 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1824 if (!rname)
1825 break;
1826 len += kdb_printf("%s: %04x", rname, reg16);
1827 break;
1828 case 32:
1829 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1830 if (!rname)
1831 break;
1832 len += kdb_printf("%s: %08x", rname, reg32);
1833 break;
1834 case 64:
1835 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1836 if (!rname)
1837 break;
1838 len += kdb_printf("%s: %016llx", rname, reg64);
1839 break;
1840 default:
1841 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1842 }
1843 }
1844 kdb_printf("\n");
1845#else
1846 if (len)
1847 return len;
1848
1849 kdb_dumpregs(kdb_current_regs);
1850#endif
1851 return 0;
1852}
1853
1854/*
1855 * kdb_rm - This function implements the 'rm' (register modify) command.
1856 * rm register-name new-contents
1857 * Remarks:
1858 * Allows register modification with the same restrictions as gdb
1859 */
1860static int kdb_rm(int argc, const char **argv)
1861{
1862#if DBG_MAX_REG_NUM > 0
1863 int diag;
1864 const char *rname;
1865 int i;
1866 u64 reg64;
1867 u32 reg32;
1868 u16 reg16;
1869 u8 reg8;
1870
1871 if (argc != 2)
1872 return KDB_ARGCOUNT;
1873 /*
1874 * Allow presence or absence of leading '%' symbol.
1875 */
1876 rname = argv[1];
1877 if (*rname == '%')
1878 rname++;
1879
1880 diag = kdbgetu64arg(argv[2], ®64);
1881 if (diag)
1882 return diag;
1883
1884 diag = kdb_check_regs();
1885 if (diag)
1886 return diag;
1887
1888 diag = KDB_BADREG;
1889 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1890 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1891 diag = 0;
1892 break;
1893 }
1894 }
1895 if (!diag) {
1896 switch(dbg_reg_def[i].size * 8) {
1897 case 8:
1898 reg8 = reg64;
1899 dbg_set_reg(i, ®8, kdb_current_regs);
1900 break;
1901 case 16:
1902 reg16 = reg64;
1903 dbg_set_reg(i, ®16, kdb_current_regs);
1904 break;
1905 case 32:
1906 reg32 = reg64;
1907 dbg_set_reg(i, ®32, kdb_current_regs);
1908 break;
1909 case 64:
1910 dbg_set_reg(i, ®64, kdb_current_regs);
1911 break;
1912 }
1913 }
1914 return diag;
1915#else
1916 kdb_printf("ERROR: Register set currently not implemented\n");
1917 return 0;
1918#endif
1919}
1920
1921#if defined(CONFIG_MAGIC_SYSRQ)
1922/*
1923 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1924 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1925 * sr <magic-sysrq-code>
1926 */
1927static int kdb_sr(int argc, const char **argv)
1928{
1929 if (argc != 1)
1930 return KDB_ARGCOUNT;
1931 kdb_trap_printk++;
1932 __handle_sysrq(*argv[1], false);
1933 kdb_trap_printk--;
1934
1935 return 0;
1936}
1937#endif /* CONFIG_MAGIC_SYSRQ */
1938
1939/*
1940 * kdb_ef - This function implements the 'regs' (display exception
1941 * frame) command. This command takes an address and expects to
1942 * find an exception frame at that address, formats and prints
1943 * it.
1944 * regs address-expression
1945 * Remarks:
1946 * Not done yet.
1947 */
1948static int kdb_ef(int argc, const char **argv)
1949{
1950 int diag;
1951 unsigned long addr;
1952 long offset;
1953 int nextarg;
1954
1955 if (argc != 1)
1956 return KDB_ARGCOUNT;
1957
1958 nextarg = 1;
1959 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1960 if (diag)
1961 return diag;
1962 show_regs((struct pt_regs *)addr);
1963 return 0;
1964}
1965
1966#if defined(CONFIG_MODULES)
1967/*
1968 * kdb_lsmod - This function implements the 'lsmod' command. Lists
1969 * currently loaded kernel modules.
1970 * Mostly taken from userland lsmod.
1971 */
1972static int kdb_lsmod(int argc, const char **argv)
1973{
1974 struct module *mod;
1975
1976 if (argc != 0)
1977 return KDB_ARGCOUNT;
1978
1979 kdb_printf("Module Size modstruct Used by\n");
1980 list_for_each_entry(mod, kdb_modules, list) {
1981
1982 kdb_printf("%-20s%8u 0x%p ", mod->name,
1983 mod->core_size, (void *)mod);
1984#ifdef CONFIG_MODULE_UNLOAD
1985 kdb_printf("%4d ", module_refcount(mod));
1986#endif
1987 if (mod->state == MODULE_STATE_GOING)
1988 kdb_printf(" (Unloading)");
1989 else if (mod->state == MODULE_STATE_COMING)
1990 kdb_printf(" (Loading)");
1991 else
1992 kdb_printf(" (Live)");
1993 kdb_printf(" 0x%p", mod->module_core);
1994
1995#ifdef CONFIG_MODULE_UNLOAD
1996 {
1997 struct module_use *use;
1998 kdb_printf(" [ ");
1999 list_for_each_entry(use, &mod->source_list,
2000 source_list)
2001 kdb_printf("%s ", use->target->name);
2002 kdb_printf("]\n");
2003 }
2004#endif
2005 }
2006
2007 return 0;
2008}
2009
2010#endif /* CONFIG_MODULES */
2011
2012/*
2013 * kdb_env - This function implements the 'env' command. Display the
2014 * current environment variables.
2015 */
2016
2017static int kdb_env(int argc, const char **argv)
2018{
2019 int i;
2020
2021 for (i = 0; i < __nenv; i++) {
2022 if (__env[i])
2023 kdb_printf("%s\n", __env[i]);
2024 }
2025
2026 if (KDB_DEBUG(MASK))
2027 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2028
2029 return 0;
2030}
2031
2032#ifdef CONFIG_PRINTK
2033/*
2034 * kdb_dmesg - This function implements the 'dmesg' command to display
2035 * the contents of the syslog buffer.
2036 * dmesg [lines] [adjust]
2037 */
2038static int kdb_dmesg(int argc, const char **argv)
2039{
2040 char *syslog_data[4], *start, *end, c = '\0', *p;
2041 int diag, logging, logsize, lines = 0, adjust = 0, n;
2042
2043 if (argc > 2)
2044 return KDB_ARGCOUNT;
2045 if (argc) {
2046 char *cp;
2047 lines = simple_strtol(argv[1], &cp, 0);
2048 if (*cp)
2049 lines = 0;
2050 if (argc > 1) {
2051 adjust = simple_strtoul(argv[2], &cp, 0);
2052 if (*cp || adjust < 0)
2053 adjust = 0;
2054 }
2055 }
2056
2057 /* disable LOGGING if set */
2058 diag = kdbgetintenv("LOGGING", &logging);
2059 if (!diag && logging) {
2060 const char *setargs[] = { "set", "LOGGING", "0" };
2061 kdb_set(2, setargs);
2062 }
2063
2064 /* syslog_data[0,1] physical start, end+1. syslog_data[2,3]
2065 * logical start, end+1. */
2066 kdb_syslog_data(syslog_data);
2067 if (syslog_data[2] == syslog_data[3])
2068 return 0;
2069 logsize = syslog_data[1] - syslog_data[0];
2070 start = syslog_data[2];
2071 end = syslog_data[3];
2072#define KDB_WRAP(p) (((p - syslog_data[0]) % logsize) + syslog_data[0])
2073 for (n = 0, p = start; p < end; ++p) {
2074 c = *KDB_WRAP(p);
2075 if (c == '\n')
2076 ++n;
2077 }
2078 if (c != '\n')
2079 ++n;
2080 if (lines < 0) {
2081 if (adjust >= n)
2082 kdb_printf("buffer only contains %d lines, nothing "
2083 "printed\n", n);
2084 else if (adjust - lines >= n)
2085 kdb_printf("buffer only contains %d lines, last %d "
2086 "lines printed\n", n, n - adjust);
2087 if (adjust) {
2088 for (; start < end && adjust; ++start) {
2089 if (*KDB_WRAP(start) == '\n')
2090 --adjust;
2091 }
2092 if (start < end)
2093 ++start;
2094 }
2095 for (p = start; p < end && lines; ++p) {
2096 if (*KDB_WRAP(p) == '\n')
2097 ++lines;
2098 }
2099 end = p;
2100 } else if (lines > 0) {
2101 int skip = n - (adjust + lines);
2102 if (adjust >= n) {
2103 kdb_printf("buffer only contains %d lines, "
2104 "nothing printed\n", n);
2105 skip = n;
2106 } else if (skip < 0) {
2107 lines += skip;
2108 skip = 0;
2109 kdb_printf("buffer only contains %d lines, first "
2110 "%d lines printed\n", n, lines);
2111 }
2112 for (; start < end && skip; ++start) {
2113 if (*KDB_WRAP(start) == '\n')
2114 --skip;
2115 }
2116 for (p = start; p < end && lines; ++p) {
2117 if (*KDB_WRAP(p) == '\n')
2118 --lines;
2119 }
2120 end = p;
2121 }
2122 /* Do a line at a time (max 200 chars) to reduce protocol overhead */
2123 c = '\n';
2124 while (start != end) {
2125 char buf[201];
2126 p = buf;
2127 if (KDB_FLAG(CMD_INTERRUPT))
2128 return 0;
2129 while (start < end && (c = *KDB_WRAP(start)) &&
2130 (p - buf) < sizeof(buf)-1) {
2131 ++start;
2132 *p++ = c;
2133 if (c == '\n')
2134 break;
2135 }
2136 *p = '\0';
2137 kdb_printf("%s", buf);
2138 }
2139 if (c != '\n')
2140 kdb_printf("\n");
2141
2142 return 0;
2143}
2144#endif /* CONFIG_PRINTK */
2145/*
2146 * kdb_cpu - This function implements the 'cpu' command.
2147 * cpu [<cpunum>]
2148 * Returns:
2149 * KDB_CMD_CPU for success, a kdb diagnostic if error
2150 */
2151static void kdb_cpu_status(void)
2152{
2153 int i, start_cpu, first_print = 1;
2154 char state, prev_state = '?';
2155
2156 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2157 kdb_printf("Available cpus: ");
2158 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2159 if (!cpu_online(i)) {
2160 state = 'F'; /* cpu is offline */
2161 } else {
2162 state = ' '; /* cpu is responding to kdb */
2163 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2164 state = 'I'; /* idle task */
2165 }
2166 if (state != prev_state) {
2167 if (prev_state != '?') {
2168 if (!first_print)
2169 kdb_printf(", ");
2170 first_print = 0;
2171 kdb_printf("%d", start_cpu);
2172 if (start_cpu < i-1)
2173 kdb_printf("-%d", i-1);
2174 if (prev_state != ' ')
2175 kdb_printf("(%c)", prev_state);
2176 }
2177 prev_state = state;
2178 start_cpu = i;
2179 }
2180 }
2181 /* print the trailing cpus, ignoring them if they are all offline */
2182 if (prev_state != 'F') {
2183 if (!first_print)
2184 kdb_printf(", ");
2185 kdb_printf("%d", start_cpu);
2186 if (start_cpu < i-1)
2187 kdb_printf("-%d", i-1);
2188 if (prev_state != ' ')
2189 kdb_printf("(%c)", prev_state);
2190 }
2191 kdb_printf("\n");
2192}
2193
2194static int kdb_cpu(int argc, const char **argv)
2195{
2196 unsigned long cpunum;
2197 int diag;
2198
2199 if (argc == 0) {
2200 kdb_cpu_status();
2201 return 0;
2202 }
2203
2204 if (argc != 1)
2205 return KDB_ARGCOUNT;
2206
2207 diag = kdbgetularg(argv[1], &cpunum);
2208 if (diag)
2209 return diag;
2210
2211 /*
2212 * Validate cpunum
2213 */
2214 if ((cpunum > NR_CPUS) || !cpu_online(cpunum))
2215 return KDB_BADCPUNUM;
2216
2217 dbg_switch_cpu = cpunum;
2218
2219 /*
2220 * Switch to other cpu
2221 */
2222 return KDB_CMD_CPU;
2223}
2224
2225/* The user may not realize that ps/bta with no parameters does not print idle
2226 * or sleeping system daemon processes, so tell them how many were suppressed.
2227 */
2228void kdb_ps_suppressed(void)
2229{
2230 int idle = 0, daemon = 0;
2231 unsigned long mask_I = kdb_task_state_string("I"),
2232 mask_M = kdb_task_state_string("M");
2233 unsigned long cpu;
2234 const struct task_struct *p, *g;
2235 for_each_online_cpu(cpu) {
2236 p = kdb_curr_task(cpu);
2237 if (kdb_task_state(p, mask_I))
2238 ++idle;
2239 }
2240 kdb_do_each_thread(g, p) {
2241 if (kdb_task_state(p, mask_M))
2242 ++daemon;
2243 } kdb_while_each_thread(g, p);
2244 if (idle || daemon) {
2245 if (idle)
2246 kdb_printf("%d idle process%s (state I)%s\n",
2247 idle, idle == 1 ? "" : "es",
2248 daemon ? " and " : "");
2249 if (daemon)
2250 kdb_printf("%d sleeping system daemon (state M) "
2251 "process%s", daemon,
2252 daemon == 1 ? "" : "es");
2253 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2254 }
2255}
2256
2257/*
2258 * kdb_ps - This function implements the 'ps' command which shows a
2259 * list of the active processes.
2260 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2261 */
2262void kdb_ps1(const struct task_struct *p)
2263{
2264 int cpu;
2265 unsigned long tmp;
2266
2267 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2268 return;
2269
2270 cpu = kdb_process_cpu(p);
2271 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2272 (void *)p, p->pid, p->parent->pid,
2273 kdb_task_has_cpu(p), kdb_process_cpu(p),
2274 kdb_task_state_char(p),
2275 (void *)(&p->thread),
2276 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2277 p->comm);
2278 if (kdb_task_has_cpu(p)) {
2279 if (!KDB_TSK(cpu)) {
2280 kdb_printf(" Error: no saved data for this cpu\n");
2281 } else {
2282 if (KDB_TSK(cpu) != p)
2283 kdb_printf(" Error: does not match running "
2284 "process table (0x%p)\n", KDB_TSK(cpu));
2285 }
2286 }
2287}
2288
2289static int kdb_ps(int argc, const char **argv)
2290{
2291 struct task_struct *g, *p;
2292 unsigned long mask, cpu;
2293
2294 if (argc == 0)
2295 kdb_ps_suppressed();
2296 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2297 (int)(2*sizeof(void *))+2, "Task Addr",
2298 (int)(2*sizeof(void *))+2, "Thread");
2299 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2300 /* Run the active tasks first */
2301 for_each_online_cpu(cpu) {
2302 if (KDB_FLAG(CMD_INTERRUPT))
2303 return 0;
2304 p = kdb_curr_task(cpu);
2305 if (kdb_task_state(p, mask))
2306 kdb_ps1(p);
2307 }
2308 kdb_printf("\n");
2309 /* Now the real tasks */
2310 kdb_do_each_thread(g, p) {
2311 if (KDB_FLAG(CMD_INTERRUPT))
2312 return 0;
2313 if (kdb_task_state(p, mask))
2314 kdb_ps1(p);
2315 } kdb_while_each_thread(g, p);
2316
2317 return 0;
2318}
2319
2320/*
2321 * kdb_pid - This function implements the 'pid' command which switches
2322 * the currently active process.
2323 * pid [<pid> | R]
2324 */
2325static int kdb_pid(int argc, const char **argv)
2326{
2327 struct task_struct *p;
2328 unsigned long val;
2329 int diag;
2330
2331 if (argc > 1)
2332 return KDB_ARGCOUNT;
2333
2334 if (argc) {
2335 if (strcmp(argv[1], "R") == 0) {
2336 p = KDB_TSK(kdb_initial_cpu);
2337 } else {
2338 diag = kdbgetularg(argv[1], &val);
2339 if (diag)
2340 return KDB_BADINT;
2341
2342 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2343 if (!p) {
2344 kdb_printf("No task with pid=%d\n", (pid_t)val);
2345 return 0;
2346 }
2347 }
2348 kdb_set_current_task(p);
2349 }
2350 kdb_printf("KDB current process is %s(pid=%d)\n",
2351 kdb_current_task->comm,
2352 kdb_current_task->pid);
2353
2354 return 0;
2355}
2356
2357/*
2358 * kdb_ll - This function implements the 'll' command which follows a
2359 * linked list and executes an arbitrary command for each
2360 * element.
2361 */
2362static int kdb_ll(int argc, const char **argv)
2363{
2364 int diag = 0;
2365 unsigned long addr;
2366 long offset = 0;
2367 unsigned long va;
2368 unsigned long linkoffset;
2369 int nextarg;
2370 const char *command;
2371
2372 if (argc != 3)
2373 return KDB_ARGCOUNT;
2374
2375 nextarg = 1;
2376 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2377 if (diag)
2378 return diag;
2379
2380 diag = kdbgetularg(argv[2], &linkoffset);
2381 if (diag)
2382 return diag;
2383
2384 /*
2385 * Using the starting address as
2386 * the first element in the list, and assuming that
2387 * the list ends with a null pointer.
2388 */
2389
2390 va = addr;
2391 command = kdb_strdup(argv[3], GFP_KDB);
2392 if (!command) {
2393 kdb_printf("%s: cannot duplicate command\n", __func__);
2394 return 0;
2395 }
2396 /* Recursive use of kdb_parse, do not use argv after this point */
2397 argv = NULL;
2398
2399 while (va) {
2400 char buf[80];
2401
2402 if (KDB_FLAG(CMD_INTERRUPT))
2403 goto out;
2404
2405 sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va);
2406 diag = kdb_parse(buf);
2407 if (diag)
2408 goto out;
2409
2410 addr = va + linkoffset;
2411 if (kdb_getword(&va, addr, sizeof(va)))
2412 goto out;
2413 }
2414
2415out:
2416 kfree(command);
2417 return diag;
2418}
2419
2420static int kdb_kgdb(int argc, const char **argv)
2421{
2422 return KDB_CMD_KGDB;
2423}
2424
2425/*
2426 * kdb_help - This function implements the 'help' and '?' commands.
2427 */
2428static int kdb_help(int argc, const char **argv)
2429{
2430 kdbtab_t *kt;
2431 int i;
2432
2433 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2434 kdb_printf("-----------------------------"
2435 "-----------------------------\n");
2436 for_each_kdbcmd(kt, i) {
2437 if (kt->cmd_name)
2438 kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name,
2439 kt->cmd_usage, kt->cmd_help);
2440 if (KDB_FLAG(CMD_INTERRUPT))
2441 return 0;
2442 }
2443 return 0;
2444}
2445
2446/*
2447 * kdb_kill - This function implements the 'kill' commands.
2448 */
2449static int kdb_kill(int argc, const char **argv)
2450{
2451 long sig, pid;
2452 char *endp;
2453 struct task_struct *p;
2454 struct siginfo info;
2455
2456 if (argc != 2)
2457 return KDB_ARGCOUNT;
2458
2459 sig = simple_strtol(argv[1], &endp, 0);
2460 if (*endp)
2461 return KDB_BADINT;
2462 if (sig >= 0) {
2463 kdb_printf("Invalid signal parameter.<-signal>\n");
2464 return 0;
2465 }
2466 sig = -sig;
2467
2468 pid = simple_strtol(argv[2], &endp, 0);
2469 if (*endp)
2470 return KDB_BADINT;
2471 if (pid <= 0) {
2472 kdb_printf("Process ID must be large than 0.\n");
2473 return 0;
2474 }
2475
2476 /* Find the process. */
2477 p = find_task_by_pid_ns(pid, &init_pid_ns);
2478 if (!p) {
2479 kdb_printf("The specified process isn't found.\n");
2480 return 0;
2481 }
2482 p = p->group_leader;
2483 info.si_signo = sig;
2484 info.si_errno = 0;
2485 info.si_code = SI_USER;
2486 info.si_pid = pid; /* same capabilities as process being signalled */
2487 info.si_uid = 0; /* kdb has root authority */
2488 kdb_send_sig_info(p, &info);
2489 return 0;
2490}
2491
2492struct kdb_tm {
2493 int tm_sec; /* seconds */
2494 int tm_min; /* minutes */
2495 int tm_hour; /* hours */
2496 int tm_mday; /* day of the month */
2497 int tm_mon; /* month */
2498 int tm_year; /* year */
2499};
2500
2501static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2502{
2503 /* This will work from 1970-2099, 2100 is not a leap year */
2504 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2505 31, 30, 31, 30, 31 };
2506 memset(tm, 0, sizeof(*tm));
2507 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2508 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2509 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2510 tm->tm_min = tm->tm_sec / 60 % 60;
2511 tm->tm_hour = tm->tm_sec / 60 / 60;
2512 tm->tm_sec = tm->tm_sec % 60;
2513 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2514 tm->tm_mday %= (4*365+1);
2515 mon_day[1] = 29;
2516 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2517 tm->tm_mday -= mon_day[tm->tm_mon];
2518 if (++tm->tm_mon == 12) {
2519 tm->tm_mon = 0;
2520 ++tm->tm_year;
2521 mon_day[1] = 28;
2522 }
2523 }
2524 ++tm->tm_mday;
2525}
2526
2527/*
2528 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2529 * I cannot call that code directly from kdb, it has an unconditional
2530 * cli()/sti() and calls routines that take locks which can stop the debugger.
2531 */
2532static void kdb_sysinfo(struct sysinfo *val)
2533{
2534 struct timespec uptime;
2535 do_posix_clock_monotonic_gettime(&uptime);
2536 memset(val, 0, sizeof(*val));
2537 val->uptime = uptime.tv_sec;
2538 val->loads[0] = avenrun[0];
2539 val->loads[1] = avenrun[1];
2540 val->loads[2] = avenrun[2];
2541 val->procs = nr_threads-1;
2542 si_meminfo(val);
2543
2544 return;
2545}
2546
2547/*
2548 * kdb_summary - This function implements the 'summary' command.
2549 */
2550static int kdb_summary(int argc, const char **argv)
2551{
2552 struct timespec now;
2553 struct kdb_tm tm;
2554 struct sysinfo val;
2555
2556 if (argc)
2557 return KDB_ARGCOUNT;
2558
2559 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2560 kdb_printf("release %s\n", init_uts_ns.name.release);
2561 kdb_printf("version %s\n", init_uts_ns.name.version);
2562 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2563 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2564 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2565 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2566
2567 now = __current_kernel_time();
2568 kdb_gmtime(&now, &tm);
2569 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2570 "tz_minuteswest %d\n",
2571 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2572 tm.tm_hour, tm.tm_min, tm.tm_sec,
2573 sys_tz.tz_minuteswest);
2574
2575 kdb_sysinfo(&val);
2576 kdb_printf("uptime ");
2577 if (val.uptime > (24*60*60)) {
2578 int days = val.uptime / (24*60*60);
2579 val.uptime %= (24*60*60);
2580 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2581 }
2582 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2583
2584 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2585
2586#define LOAD_INT(x) ((x) >> FSHIFT)
2587#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2588 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2589 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2590 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2591 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2592#undef LOAD_INT
2593#undef LOAD_FRAC
2594 /* Display in kilobytes */
2595#define K(x) ((x) << (PAGE_SHIFT - 10))
2596 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2597 "Buffers: %8lu kB\n",
2598 val.totalram, val.freeram, val.bufferram);
2599 return 0;
2600}
2601
2602/*
2603 * kdb_per_cpu - This function implements the 'per_cpu' command.
2604 */
2605static int kdb_per_cpu(int argc, const char **argv)
2606{
2607 char fmtstr[64];
2608 int cpu, diag, nextarg = 1;
2609 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2610
2611 if (argc < 1 || argc > 3)
2612 return KDB_ARGCOUNT;
2613
2614 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2615 if (diag)
2616 return diag;
2617
2618 if (argc >= 2) {
2619 diag = kdbgetularg(argv[2], &bytesperword);
2620 if (diag)
2621 return diag;
2622 }
2623 if (!bytesperword)
2624 bytesperword = KDB_WORD_SIZE;
2625 else if (bytesperword > KDB_WORD_SIZE)
2626 return KDB_BADWIDTH;
2627 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2628 if (argc >= 3) {
2629 diag = kdbgetularg(argv[3], &whichcpu);
2630 if (diag)
2631 return diag;
2632 if (!cpu_online(whichcpu)) {
2633 kdb_printf("cpu %ld is not online\n", whichcpu);
2634 return KDB_BADCPUNUM;
2635 }
2636 }
2637
2638 /* Most architectures use __per_cpu_offset[cpu], some use
2639 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2640 */
2641#ifdef __per_cpu_offset
2642#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2643#else
2644#ifdef CONFIG_SMP
2645#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2646#else
2647#define KDB_PCU(cpu) 0
2648#endif
2649#endif
2650 for_each_online_cpu(cpu) {
2651 if (KDB_FLAG(CMD_INTERRUPT))
2652 return 0;
2653
2654 if (whichcpu != ~0UL && whichcpu != cpu)
2655 continue;
2656 addr = symaddr + KDB_PCU(cpu);
2657 diag = kdb_getword(&val, addr, bytesperword);
2658 if (diag) {
2659 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2660 "read, diag=%d\n", cpu, addr, diag);
2661 continue;
2662 }
2663 kdb_printf("%5d ", cpu);
2664 kdb_md_line(fmtstr, addr,
2665 bytesperword == KDB_WORD_SIZE,
2666 1, bytesperword, 1, 1, 0);
2667 }
2668#undef KDB_PCU
2669 return 0;
2670}
2671
2672/*
2673 * display help for the use of cmd | grep pattern
2674 */
2675static int kdb_grep_help(int argc, const char **argv)
2676{
2677 kdb_printf("Usage of cmd args | grep pattern:\n");
2678 kdb_printf(" Any command's output may be filtered through an ");
2679 kdb_printf("emulated 'pipe'.\n");
2680 kdb_printf(" 'grep' is just a key word.\n");
2681 kdb_printf(" The pattern may include a very limited set of "
2682 "metacharacters:\n");
2683 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2684 kdb_printf(" And if there are spaces in the pattern, you may "
2685 "quote it:\n");
2686 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2687 " or \"^pat tern$\"\n");
2688 return 0;
2689}
2690
2691/*
2692 * kdb_register_repeat - This function is used to register a kernel
2693 * debugger command.
2694 * Inputs:
2695 * cmd Command name
2696 * func Function to execute the command
2697 * usage A simple usage string showing arguments
2698 * help A simple help string describing command
2699 * repeat Does the command auto repeat on enter?
2700 * Returns:
2701 * zero for success, one if a duplicate command.
2702 */
2703#define kdb_command_extend 50 /* arbitrary */
2704int kdb_register_repeat(char *cmd,
2705 kdb_func_t func,
2706 char *usage,
2707 char *help,
2708 short minlen,
2709 kdb_repeat_t repeat)
2710{
2711 int i;
2712 kdbtab_t *kp;
2713
2714 /*
2715 * Brute force method to determine duplicates
2716 */
2717 for_each_kdbcmd(kp, i) {
2718 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2719 kdb_printf("Duplicate kdb command registered: "
2720 "%s, func %p help %s\n", cmd, func, help);
2721 return 1;
2722 }
2723 }
2724
2725 /*
2726 * Insert command into first available location in table
2727 */
2728 for_each_kdbcmd(kp, i) {
2729 if (kp->cmd_name == NULL)
2730 break;
2731 }
2732
2733 if (i >= kdb_max_commands) {
2734 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2735 kdb_command_extend) * sizeof(*new), GFP_KDB);
2736 if (!new) {
2737 kdb_printf("Could not allocate new kdb_command "
2738 "table\n");
2739 return 1;
2740 }
2741 if (kdb_commands) {
2742 memcpy(new, kdb_commands,
2743 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2744 kfree(kdb_commands);
2745 }
2746 memset(new + kdb_max_commands, 0,
2747 kdb_command_extend * sizeof(*new));
2748 kdb_commands = new;
2749 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2750 kdb_max_commands += kdb_command_extend;
2751 }
2752
2753 kp->cmd_name = cmd;
2754 kp->cmd_func = func;
2755 kp->cmd_usage = usage;
2756 kp->cmd_help = help;
2757 kp->cmd_flags = 0;
2758 kp->cmd_minlen = minlen;
2759 kp->cmd_repeat = repeat;
2760
2761 return 0;
2762}
2763EXPORT_SYMBOL_GPL(kdb_register_repeat);
2764
2765
2766/*
2767 * kdb_register - Compatibility register function for commands that do
2768 * not need to specify a repeat state. Equivalent to
2769 * kdb_register_repeat with KDB_REPEAT_NONE.
2770 * Inputs:
2771 * cmd Command name
2772 * func Function to execute the command
2773 * usage A simple usage string showing arguments
2774 * help A simple help string describing command
2775 * Returns:
2776 * zero for success, one if a duplicate command.
2777 */
2778int kdb_register(char *cmd,
2779 kdb_func_t func,
2780 char *usage,
2781 char *help,
2782 short minlen)
2783{
2784 return kdb_register_repeat(cmd, func, usage, help, minlen,
2785 KDB_REPEAT_NONE);
2786}
2787EXPORT_SYMBOL_GPL(kdb_register);
2788
2789/*
2790 * kdb_unregister - This function is used to unregister a kernel
2791 * debugger command. It is generally called when a module which
2792 * implements kdb commands is unloaded.
2793 * Inputs:
2794 * cmd Command name
2795 * Returns:
2796 * zero for success, one command not registered.
2797 */
2798int kdb_unregister(char *cmd)
2799{
2800 int i;
2801 kdbtab_t *kp;
2802
2803 /*
2804 * find the command.
2805 */
2806 for_each_kdbcmd(kp, i) {
2807 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2808 kp->cmd_name = NULL;
2809 return 0;
2810 }
2811 }
2812
2813 /* Couldn't find it. */
2814 return 1;
2815}
2816EXPORT_SYMBOL_GPL(kdb_unregister);
2817
2818/* Initialize the kdb command table. */
2819static void __init kdb_inittab(void)
2820{
2821 int i;
2822 kdbtab_t *kp;
2823
2824 for_each_kdbcmd(kp, i)
2825 kp->cmd_name = NULL;
2826
2827 kdb_register_repeat("md", kdb_md, "<vaddr>",
2828 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2829 KDB_REPEAT_NO_ARGS);
2830 kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>",
2831 "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS);
2832 kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>",
2833 "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS);
2834 kdb_register_repeat("mds", kdb_md, "<vaddr>",
2835 "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS);
2836 kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>",
2837 "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS);
2838 kdb_register_repeat("go", kdb_go, "[<vaddr>]",
2839 "Continue Execution", 1, KDB_REPEAT_NONE);
2840 kdb_register_repeat("rd", kdb_rd, "",
2841 "Display Registers", 0, KDB_REPEAT_NONE);
2842 kdb_register_repeat("rm", kdb_rm, "<reg> <contents>",
2843 "Modify Registers", 0, KDB_REPEAT_NONE);
2844 kdb_register_repeat("ef", kdb_ef, "<vaddr>",
2845 "Display exception frame", 0, KDB_REPEAT_NONE);
2846 kdb_register_repeat("bt", kdb_bt, "[<vaddr>]",
2847 "Stack traceback", 1, KDB_REPEAT_NONE);
2848 kdb_register_repeat("btp", kdb_bt, "<pid>",
2849 "Display stack for process <pid>", 0, KDB_REPEAT_NONE);
2850 kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]",
2851 "Display stack all processes", 0, KDB_REPEAT_NONE);
2852 kdb_register_repeat("btc", kdb_bt, "",
2853 "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE);
2854 kdb_register_repeat("btt", kdb_bt, "<vaddr>",
2855 "Backtrace process given its struct task address", 0,
2856 KDB_REPEAT_NONE);
2857 kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>",
2858 "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE);
2859 kdb_register_repeat("env", kdb_env, "",
2860 "Show environment variables", 0, KDB_REPEAT_NONE);
2861 kdb_register_repeat("set", kdb_set, "",
2862 "Set environment variables", 0, KDB_REPEAT_NONE);
2863 kdb_register_repeat("help", kdb_help, "",
2864 "Display Help Message", 1, KDB_REPEAT_NONE);
2865 kdb_register_repeat("?", kdb_help, "",
2866 "Display Help Message", 0, KDB_REPEAT_NONE);
2867 kdb_register_repeat("cpu", kdb_cpu, "<cpunum>",
2868 "Switch to new cpu", 0, KDB_REPEAT_NONE);
2869 kdb_register_repeat("kgdb", kdb_kgdb, "",
2870 "Enter kgdb mode", 0, KDB_REPEAT_NONE);
2871 kdb_register_repeat("ps", kdb_ps, "[<flags>|A]",
2872 "Display active task list", 0, KDB_REPEAT_NONE);
2873 kdb_register_repeat("pid", kdb_pid, "<pidnum>",
2874 "Switch to another task", 0, KDB_REPEAT_NONE);
2875 kdb_register_repeat("reboot", kdb_reboot, "",
2876 "Reboot the machine immediately", 0, KDB_REPEAT_NONE);
2877#if defined(CONFIG_MODULES)
2878 kdb_register_repeat("lsmod", kdb_lsmod, "",
2879 "List loaded kernel modules", 0, KDB_REPEAT_NONE);
2880#endif
2881#if defined(CONFIG_MAGIC_SYSRQ)
2882 kdb_register_repeat("sr", kdb_sr, "<key>",
2883 "Magic SysRq key", 0, KDB_REPEAT_NONE);
2884#endif
2885#if defined(CONFIG_PRINTK)
2886 kdb_register_repeat("dmesg", kdb_dmesg, "[lines]",
2887 "Display syslog buffer", 0, KDB_REPEAT_NONE);
2888#endif
2889 kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2890 "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE);
2891 kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>",
2892 "Send a signal to a process", 0, KDB_REPEAT_NONE);
2893 kdb_register_repeat("summary", kdb_summary, "",
2894 "Summarize the system", 4, KDB_REPEAT_NONE);
2895 kdb_register_repeat("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2896 "Display per_cpu variables", 3, KDB_REPEAT_NONE);
2897 kdb_register_repeat("grephelp", kdb_grep_help, "",
2898 "Display help on | grep", 0, KDB_REPEAT_NONE);
2899}
2900
2901/* Execute any commands defined in kdb_cmds. */
2902static void __init kdb_cmd_init(void)
2903{
2904 int i, diag;
2905 for (i = 0; kdb_cmds[i]; ++i) {
2906 diag = kdb_parse(kdb_cmds[i]);
2907 if (diag)
2908 kdb_printf("kdb command %s failed, kdb diag %d\n",
2909 kdb_cmds[i], diag);
2910 }
2911 if (defcmd_in_progress) {
2912 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2913 kdb_parse("endefcmd");
2914 }
2915}
2916
2917/* Initialize kdb_printf, breakpoint tables and kdb state */
2918void __init kdb_init(int lvl)
2919{
2920 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2921 int i;
2922
2923 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2924 return;
2925 for (i = kdb_init_lvl; i < lvl; i++) {
2926 switch (i) {
2927 case KDB_NOT_INITIALIZED:
2928 kdb_inittab(); /* Initialize Command Table */
2929 kdb_initbptab(); /* Initialize Breakpoints */
2930 break;
2931 case KDB_INIT_EARLY:
2932 kdb_cmd_init(); /* Build kdb_cmds tables */
2933 break;
2934 }
2935 }
2936 kdb_init_lvl = lvl;
2937}