Loading...
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/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sched/loadavg.h>
22#include <linux/sched/stat.h>
23#include <linux/sched/debug.h>
24#include <linux/sysrq.h>
25#include <linux/smp.h>
26#include <linux/utsname.h>
27#include <linux/vmalloc.h>
28#include <linux/atomic.h>
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/mm.h>
32#include <linux/init.h>
33#include <linux/kallsyms.h>
34#include <linux/kgdb.h>
35#include <linux/kdb.h>
36#include <linux/notifier.h>
37#include <linux/interrupt.h>
38#include <linux/delay.h>
39#include <linux/nmi.h>
40#include <linux/time.h>
41#include <linux/ptrace.h>
42#include <linux/sysctl.h>
43#include <linux/cpu.h>
44#include <linux/kdebug.h>
45#include <linux/proc_fs.h>
46#include <linux/uaccess.h>
47#include <linux/slab.h>
48#include "kdb_private.h"
49
50#undef MODULE_PARAM_PREFIX
51#define MODULE_PARAM_PREFIX "kdb."
52
53static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
54module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
55
56char kdb_grep_string[KDB_GREP_STRLEN];
57int kdb_grepping_flag;
58EXPORT_SYMBOL(kdb_grepping_flag);
59int kdb_grep_leading;
60int kdb_grep_trailing;
61
62/*
63 * Kernel debugger state flags
64 */
65int 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;
76EXPORT_SYMBOL(kdb_current_task);
77struct pt_regs *kdb_current_regs;
78
79const char *kdb_diemsg;
80static int kdb_go_count;
81#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
82static unsigned int kdb_continue_catastrophic =
83 CONFIG_KDB_CONTINUE_CATASTROPHIC;
84#else
85static unsigned int kdb_continue_catastrophic;
86#endif
87
88/* kdb_commands describes the available commands. */
89static kdbtab_t *kdb_commands;
90#define KDB_BASE_CMD_MAX 50
91static int kdb_max_commands = KDB_BASE_CMD_MAX;
92static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
93#define for_each_kdbcmd(cmd, num) \
94 for ((cmd) = kdb_base_commands, (num) = 0; \
95 num < kdb_max_commands; \
96 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
97
98typedef struct _kdbmsg {
99 int km_diag; /* kdb diagnostic */
100 char *km_msg; /* Corresponding message text */
101} kdbmsg_t;
102
103#define KDBMSG(msgnum, text) \
104 { KDB_##msgnum, text }
105
106static kdbmsg_t kdbmsgs[] = {
107 KDBMSG(NOTFOUND, "Command Not Found"),
108 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
109 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
110 "8 is only allowed on 64 bit systems"),
111 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
112 KDBMSG(NOTENV, "Cannot find environment variable"),
113 KDBMSG(NOENVVALUE, "Environment variable should have value"),
114 KDBMSG(NOTIMP, "Command not implemented"),
115 KDBMSG(ENVFULL, "Environment full"),
116 KDBMSG(ENVBUFFULL, "Environment buffer full"),
117 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
118#ifdef CONFIG_CPU_XSCALE
119 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
120#else
121 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
122#endif
123 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
124 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
125 KDBMSG(BADMODE, "Invalid IDMODE"),
126 KDBMSG(BADINT, "Illegal numeric value"),
127 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
128 KDBMSG(BADREG, "Invalid register name"),
129 KDBMSG(BADCPUNUM, "Invalid cpu number"),
130 KDBMSG(BADLENGTH, "Invalid length field"),
131 KDBMSG(NOBP, "No Breakpoint exists"),
132 KDBMSG(BADADDR, "Invalid address"),
133 KDBMSG(NOPERM, "Permission denied"),
134};
135#undef KDBMSG
136
137static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
138
139
140/*
141 * Initial environment. This is all kept static and local to
142 * this file. We don't want to rely on the memory allocation
143 * mechanisms in the kernel, so we use a very limited allocate-only
144 * heap for new and altered environment variables. The entire
145 * environment is limited to a fixed number of entries (add more
146 * to __env[] if required) and a fixed amount of heap (add more to
147 * KDB_ENVBUFSIZE if required).
148 */
149
150static char *__env[] = {
151#if defined(CONFIG_SMP)
152 "PROMPT=[%d]kdb> ",
153#else
154 "PROMPT=kdb> ",
155#endif
156 "MOREPROMPT=more> ",
157 "RADIX=16",
158 "MDCOUNT=8", /* lines of md output */
159 KDB_PLATFORM_ENV,
160 "DTABCOUNT=30",
161 "NOSECT=1",
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176 (char *)0,
177 (char *)0,
178 (char *)0,
179 (char *)0,
180 (char *)0,
181 (char *)0,
182 (char *)0,
183 (char *)0,
184 (char *)0,
185 (char *)0,
186};
187
188static const int __nenv = ARRAY_SIZE(__env);
189
190struct task_struct *kdb_curr_task(int cpu)
191{
192 struct task_struct *p = curr_task(cpu);
193#ifdef _TIF_MCA_INIT
194 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
195 p = krp->p;
196#endif
197 return p;
198}
199
200/*
201 * Check whether the flags of the current command and the permissions
202 * of the kdb console has allow a command to be run.
203 */
204static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
205 bool no_args)
206{
207 /* permissions comes from userspace so needs massaging slightly */
208 permissions &= KDB_ENABLE_MASK;
209 permissions |= KDB_ENABLE_ALWAYS_SAFE;
210
211 /* some commands change group when launched with no arguments */
212 if (no_args)
213 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
214
215 flags |= KDB_ENABLE_ALL;
216
217 return permissions & flags;
218}
219
220/*
221 * kdbgetenv - This function will return the character string value of
222 * an environment variable.
223 * Parameters:
224 * match A character string representing an environment variable.
225 * Returns:
226 * NULL No environment variable matches 'match'
227 * char* Pointer to string value of environment variable.
228 */
229char *kdbgetenv(const char *match)
230{
231 char **ep = __env;
232 int matchlen = strlen(match);
233 int i;
234
235 for (i = 0; i < __nenv; i++) {
236 char *e = *ep++;
237
238 if (!e)
239 continue;
240
241 if ((strncmp(match, e, matchlen) == 0)
242 && ((e[matchlen] == '\0')
243 || (e[matchlen] == '='))) {
244 char *cp = strchr(e, '=');
245 return cp ? ++cp : "";
246 }
247 }
248 return NULL;
249}
250
251/*
252 * kdballocenv - This function is used to allocate bytes for
253 * environment entries.
254 * Parameters:
255 * match A character string representing a numeric value
256 * Outputs:
257 * *value the unsigned long representation of the env variable 'match'
258 * Returns:
259 * Zero on success, a kdb diagnostic on failure.
260 * Remarks:
261 * We use a static environment buffer (envbuffer) to hold the values
262 * of dynamically generated environment variables (see kdb_set). Buffer
263 * space once allocated is never free'd, so over time, the amount of space
264 * (currently 512 bytes) will be exhausted if env variables are changed
265 * frequently.
266 */
267static char *kdballocenv(size_t bytes)
268{
269#define KDB_ENVBUFSIZE 512
270 static char envbuffer[KDB_ENVBUFSIZE];
271 static int envbufsize;
272 char *ep = NULL;
273
274 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
275 ep = &envbuffer[envbufsize];
276 envbufsize += bytes;
277 }
278 return ep;
279}
280
281/*
282 * kdbgetulenv - This function will return the value of an unsigned
283 * long-valued environment variable.
284 * Parameters:
285 * match A character string representing a numeric value
286 * Outputs:
287 * *value the unsigned long represntation of the env variable 'match'
288 * Returns:
289 * Zero on success, a kdb diagnostic on failure.
290 */
291static int kdbgetulenv(const char *match, unsigned long *value)
292{
293 char *ep;
294
295 ep = kdbgetenv(match);
296 if (!ep)
297 return KDB_NOTENV;
298 if (strlen(ep) == 0)
299 return KDB_NOENVVALUE;
300
301 *value = simple_strtoul(ep, NULL, 0);
302
303 return 0;
304}
305
306/*
307 * kdbgetintenv - This function will return the value of an
308 * integer-valued environment variable.
309 * Parameters:
310 * match A character string representing an integer-valued env variable
311 * Outputs:
312 * *value the integer representation of the environment variable 'match'
313 * Returns:
314 * Zero on success, a kdb diagnostic on failure.
315 */
316int kdbgetintenv(const char *match, int *value)
317{
318 unsigned long val;
319 int diag;
320
321 diag = kdbgetulenv(match, &val);
322 if (!diag)
323 *value = (int) val;
324 return diag;
325}
326
327/*
328 * kdbgetularg - This function will convert a numeric string into an
329 * unsigned long value.
330 * Parameters:
331 * arg A character string representing a numeric value
332 * Outputs:
333 * *value the unsigned long represntation of arg.
334 * Returns:
335 * Zero on success, a kdb diagnostic on failure.
336 */
337int kdbgetularg(const char *arg, unsigned long *value)
338{
339 char *endp;
340 unsigned long val;
341
342 val = simple_strtoul(arg, &endp, 0);
343
344 if (endp == arg) {
345 /*
346 * Also try base 16, for us folks too lazy to type the
347 * leading 0x...
348 */
349 val = simple_strtoul(arg, &endp, 16);
350 if (endp == arg)
351 return KDB_BADINT;
352 }
353
354 *value = val;
355
356 return 0;
357}
358
359int kdbgetu64arg(const char *arg, u64 *value)
360{
361 char *endp;
362 u64 val;
363
364 val = simple_strtoull(arg, &endp, 0);
365
366 if (endp == arg) {
367
368 val = simple_strtoull(arg, &endp, 16);
369 if (endp == arg)
370 return KDB_BADINT;
371 }
372
373 *value = val;
374
375 return 0;
376}
377
378/*
379 * kdb_set - This function implements the 'set' command. Alter an
380 * existing environment variable or create a new one.
381 */
382int kdb_set(int argc, const char **argv)
383{
384 int i;
385 char *ep;
386 size_t varlen, vallen;
387
388 /*
389 * we can be invoked two ways:
390 * set var=value argv[1]="var", argv[2]="value"
391 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
392 * - if the latter, shift 'em down.
393 */
394 if (argc == 3) {
395 argv[2] = argv[3];
396 argc--;
397 }
398
399 if (argc != 2)
400 return KDB_ARGCOUNT;
401
402 /*
403 * Check for internal variables
404 */
405 if (strcmp(argv[1], "KDBDEBUG") == 0) {
406 unsigned int debugflags;
407 char *cp;
408
409 debugflags = simple_strtoul(argv[2], &cp, 0);
410 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
411 kdb_printf("kdb: illegal debug flags '%s'\n",
412 argv[2]);
413 return 0;
414 }
415 kdb_flags = (kdb_flags &
416 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
417 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
418
419 return 0;
420 }
421
422 /*
423 * Tokenizer squashed the '=' sign. argv[1] is variable
424 * name, argv[2] = value.
425 */
426 varlen = strlen(argv[1]);
427 vallen = strlen(argv[2]);
428 ep = kdballocenv(varlen + vallen + 2);
429 if (ep == (char *)0)
430 return KDB_ENVBUFFULL;
431
432 sprintf(ep, "%s=%s", argv[1], argv[2]);
433
434 ep[varlen+vallen+1] = '\0';
435
436 for (i = 0; i < __nenv; i++) {
437 if (__env[i]
438 && ((strncmp(__env[i], argv[1], varlen) == 0)
439 && ((__env[i][varlen] == '\0')
440 || (__env[i][varlen] == '=')))) {
441 __env[i] = ep;
442 return 0;
443 }
444 }
445
446 /*
447 * Wasn't existing variable. Fit into slot.
448 */
449 for (i = 0; i < __nenv-1; i++) {
450 if (__env[i] == (char *)0) {
451 __env[i] = ep;
452 return 0;
453 }
454 }
455
456 return KDB_ENVFULL;
457}
458
459static int kdb_check_regs(void)
460{
461 if (!kdb_current_regs) {
462 kdb_printf("No current kdb registers."
463 " You may need to select another task\n");
464 return KDB_BADREG;
465 }
466 return 0;
467}
468
469/*
470 * kdbgetaddrarg - This function is responsible for parsing an
471 * address-expression and returning the value of the expression,
472 * symbol name, and offset to the caller.
473 *
474 * The argument may consist of a numeric value (decimal or
475 * hexidecimal), a symbol name, a register name (preceded by the
476 * percent sign), an environment variable with a numeric value
477 * (preceded by a dollar sign) or a simple arithmetic expression
478 * consisting of a symbol name, +/-, and a numeric constant value
479 * (offset).
480 * Parameters:
481 * argc - count of arguments in argv
482 * argv - argument vector
483 * *nextarg - index to next unparsed argument in argv[]
484 * regs - Register state at time of KDB entry
485 * Outputs:
486 * *value - receives the value of the address-expression
487 * *offset - receives the offset specified, if any
488 * *name - receives the symbol name, if any
489 * *nextarg - index to next unparsed argument in argv[]
490 * Returns:
491 * zero is returned on success, a kdb diagnostic code is
492 * returned on error.
493 */
494int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
495 unsigned long *value, long *offset,
496 char **name)
497{
498 unsigned long addr;
499 unsigned long off = 0;
500 int positive;
501 int diag;
502 int found = 0;
503 char *symname;
504 char symbol = '\0';
505 char *cp;
506 kdb_symtab_t symtab;
507
508 /*
509 * If the enable flags prohibit both arbitrary memory access
510 * and flow control then there are no reasonable grounds to
511 * provide symbol lookup.
512 */
513 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
514 kdb_cmd_enabled, false))
515 return KDB_NOPERM;
516
517 /*
518 * Process arguments which follow the following syntax:
519 *
520 * symbol | numeric-address [+/- numeric-offset]
521 * %register
522 * $environment-variable
523 */
524
525 if (*nextarg > argc)
526 return KDB_ARGCOUNT;
527
528 symname = (char *)argv[*nextarg];
529
530 /*
531 * If there is no whitespace between the symbol
532 * or address and the '+' or '-' symbols, we
533 * remember the character and replace it with a
534 * null so the symbol/value can be properly parsed
535 */
536 cp = strpbrk(symname, "+-");
537 if (cp != NULL) {
538 symbol = *cp;
539 *cp++ = '\0';
540 }
541
542 if (symname[0] == '$') {
543 diag = kdbgetulenv(&symname[1], &addr);
544 if (diag)
545 return diag;
546 } else if (symname[0] == '%') {
547 diag = kdb_check_regs();
548 if (diag)
549 return diag;
550 /* Implement register values with % at a later time as it is
551 * arch optional.
552 */
553 return KDB_NOTIMP;
554 } else {
555 found = kdbgetsymval(symname, &symtab);
556 if (found) {
557 addr = symtab.sym_start;
558 } else {
559 diag = kdbgetularg(argv[*nextarg], &addr);
560 if (diag)
561 return diag;
562 }
563 }
564
565 if (!found)
566 found = kdbnearsym(addr, &symtab);
567
568 (*nextarg)++;
569
570 if (name)
571 *name = symname;
572 if (value)
573 *value = addr;
574 if (offset && name && *name)
575 *offset = addr - symtab.sym_start;
576
577 if ((*nextarg > argc)
578 && (symbol == '\0'))
579 return 0;
580
581 /*
582 * check for +/- and offset
583 */
584
585 if (symbol == '\0') {
586 if ((argv[*nextarg][0] != '+')
587 && (argv[*nextarg][0] != '-')) {
588 /*
589 * Not our argument. Return.
590 */
591 return 0;
592 } else {
593 positive = (argv[*nextarg][0] == '+');
594 (*nextarg)++;
595 }
596 } else
597 positive = (symbol == '+');
598
599 /*
600 * Now there must be an offset!
601 */
602 if ((*nextarg > argc)
603 && (symbol == '\0')) {
604 return KDB_INVADDRFMT;
605 }
606
607 if (!symbol) {
608 cp = (char *)argv[*nextarg];
609 (*nextarg)++;
610 }
611
612 diag = kdbgetularg(cp, &off);
613 if (diag)
614 return diag;
615
616 if (!positive)
617 off = -off;
618
619 if (offset)
620 *offset += off;
621
622 if (value)
623 *value += off;
624
625 return 0;
626}
627
628static void kdb_cmderror(int diag)
629{
630 int i;
631
632 if (diag >= 0) {
633 kdb_printf("no error detected (diagnostic is %d)\n", diag);
634 return;
635 }
636
637 for (i = 0; i < __nkdb_err; i++) {
638 if (kdbmsgs[i].km_diag == diag) {
639 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
640 return;
641 }
642 }
643
644 kdb_printf("Unknown diag %d\n", -diag);
645}
646
647/*
648 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
649 * command which defines one command as a set of other commands,
650 * terminated by endefcmd. kdb_defcmd processes the initial
651 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
652 * the following commands until 'endefcmd'.
653 * Inputs:
654 * argc argument count
655 * argv argument vector
656 * Returns:
657 * zero for success, a kdb diagnostic if error
658 */
659struct defcmd_set {
660 int count;
661 bool usable;
662 char *name;
663 char *usage;
664 char *help;
665 char **command;
666};
667static struct defcmd_set *defcmd_set;
668static int defcmd_set_count;
669static bool defcmd_in_progress;
670
671/* Forward references */
672static int kdb_exec_defcmd(int argc, const char **argv);
673
674static int kdb_defcmd2(const char *cmdstr, const char *argv0)
675{
676 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
677 char **save_command = s->command;
678 if (strcmp(argv0, "endefcmd") == 0) {
679 defcmd_in_progress = false;
680 if (!s->count)
681 s->usable = false;
682 if (s->usable)
683 /* macros are always safe because when executed each
684 * internal command re-enters kdb_parse() and is
685 * safety checked individually.
686 */
687 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
688 s->help, 0,
689 KDB_ENABLE_ALWAYS_SAFE);
690 return 0;
691 }
692 if (!s->usable)
693 return KDB_NOTIMP;
694 s->command = kcalloc(s->count + 1, sizeof(*(s->command)), GFP_KDB);
695 if (!s->command) {
696 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
697 cmdstr);
698 s->usable = false;
699 return KDB_NOTIMP;
700 }
701 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
702 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
703 kfree(save_command);
704 return 0;
705}
706
707static int kdb_defcmd(int argc, const char **argv)
708{
709 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
710 if (defcmd_in_progress) {
711 kdb_printf("kdb: nested defcmd detected, assuming missing "
712 "endefcmd\n");
713 kdb_defcmd2("endefcmd", "endefcmd");
714 }
715 if (argc == 0) {
716 int i;
717 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
718 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
719 s->usage, s->help);
720 for (i = 0; i < s->count; ++i)
721 kdb_printf("%s", s->command[i]);
722 kdb_printf("endefcmd\n");
723 }
724 return 0;
725 }
726 if (argc != 3)
727 return KDB_ARGCOUNT;
728 if (in_dbg_master()) {
729 kdb_printf("Command only available during kdb_init()\n");
730 return KDB_NOTIMP;
731 }
732 defcmd_set = kmalloc_array(defcmd_set_count + 1, sizeof(*defcmd_set),
733 GFP_KDB);
734 if (!defcmd_set)
735 goto fail_defcmd;
736 memcpy(defcmd_set, save_defcmd_set,
737 defcmd_set_count * sizeof(*defcmd_set));
738 s = defcmd_set + defcmd_set_count;
739 memset(s, 0, sizeof(*s));
740 s->usable = true;
741 s->name = kdb_strdup(argv[1], GFP_KDB);
742 if (!s->name)
743 goto fail_name;
744 s->usage = kdb_strdup(argv[2], GFP_KDB);
745 if (!s->usage)
746 goto fail_usage;
747 s->help = kdb_strdup(argv[3], GFP_KDB);
748 if (!s->help)
749 goto fail_help;
750 if (s->usage[0] == '"') {
751 strcpy(s->usage, argv[2]+1);
752 s->usage[strlen(s->usage)-1] = '\0';
753 }
754 if (s->help[0] == '"') {
755 strcpy(s->help, argv[3]+1);
756 s->help[strlen(s->help)-1] = '\0';
757 }
758 ++defcmd_set_count;
759 defcmd_in_progress = true;
760 kfree(save_defcmd_set);
761 return 0;
762fail_help:
763 kfree(s->usage);
764fail_usage:
765 kfree(s->name);
766fail_name:
767 kfree(defcmd_set);
768fail_defcmd:
769 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
770 defcmd_set = save_defcmd_set;
771 return KDB_NOTIMP;
772}
773
774/*
775 * kdb_exec_defcmd - Execute the set of commands associated with this
776 * defcmd name.
777 * Inputs:
778 * argc argument count
779 * argv argument vector
780 * Returns:
781 * zero for success, a kdb diagnostic if error
782 */
783static int kdb_exec_defcmd(int argc, const char **argv)
784{
785 int i, ret;
786 struct defcmd_set *s;
787 if (argc != 0)
788 return KDB_ARGCOUNT;
789 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
790 if (strcmp(s->name, argv[0]) == 0)
791 break;
792 }
793 if (i == defcmd_set_count) {
794 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
795 argv[0]);
796 return KDB_NOTIMP;
797 }
798 for (i = 0; i < s->count; ++i) {
799 /* Recursive use of kdb_parse, do not use argv after
800 * this point */
801 argv = NULL;
802 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
803 ret = kdb_parse(s->command[i]);
804 if (ret)
805 return ret;
806 }
807 return 0;
808}
809
810/* Command history */
811#define KDB_CMD_HISTORY_COUNT 32
812#define CMD_BUFLEN 200 /* kdb_printf: max printline
813 * size == 256 */
814static unsigned int cmd_head, cmd_tail;
815static unsigned int cmdptr;
816static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
817static char cmd_cur[CMD_BUFLEN];
818
819/*
820 * The "str" argument may point to something like | grep xyz
821 */
822static void parse_grep(const char *str)
823{
824 int len;
825 char *cp = (char *)str, *cp2;
826
827 /* sanity check: we should have been called with the \ first */
828 if (*cp != '|')
829 return;
830 cp++;
831 while (isspace(*cp))
832 cp++;
833 if (!str_has_prefix(cp, "grep ")) {
834 kdb_printf("invalid 'pipe', see grephelp\n");
835 return;
836 }
837 cp += 5;
838 while (isspace(*cp))
839 cp++;
840 cp2 = strchr(cp, '\n');
841 if (cp2)
842 *cp2 = '\0'; /* remove the trailing newline */
843 len = strlen(cp);
844 if (len == 0) {
845 kdb_printf("invalid 'pipe', see grephelp\n");
846 return;
847 }
848 /* now cp points to a nonzero length search string */
849 if (*cp == '"') {
850 /* allow it be "x y z" by removing the "'s - there must
851 be two of them */
852 cp++;
853 cp2 = strchr(cp, '"');
854 if (!cp2) {
855 kdb_printf("invalid quoted string, see grephelp\n");
856 return;
857 }
858 *cp2 = '\0'; /* end the string where the 2nd " was */
859 }
860 kdb_grep_leading = 0;
861 if (*cp == '^') {
862 kdb_grep_leading = 1;
863 cp++;
864 }
865 len = strlen(cp);
866 kdb_grep_trailing = 0;
867 if (*(cp+len-1) == '$') {
868 kdb_grep_trailing = 1;
869 *(cp+len-1) = '\0';
870 }
871 len = strlen(cp);
872 if (!len)
873 return;
874 if (len >= KDB_GREP_STRLEN) {
875 kdb_printf("search string too long\n");
876 return;
877 }
878 strcpy(kdb_grep_string, cp);
879 kdb_grepping_flag++;
880 return;
881}
882
883/*
884 * kdb_parse - Parse the command line, search the command table for a
885 * matching command and invoke the command function. This
886 * function may be called recursively, if it is, the second call
887 * will overwrite argv and cbuf. It is the caller's
888 * responsibility to save their argv if they recursively call
889 * kdb_parse().
890 * Parameters:
891 * cmdstr The input command line to be parsed.
892 * regs The registers at the time kdb was entered.
893 * Returns:
894 * Zero for success, a kdb diagnostic if failure.
895 * Remarks:
896 * Limited to 20 tokens.
897 *
898 * Real rudimentary tokenization. Basically only whitespace
899 * is considered a token delimeter (but special consideration
900 * is taken of the '=' sign as used by the 'set' command).
901 *
902 * The algorithm used to tokenize the input string relies on
903 * there being at least one whitespace (or otherwise useless)
904 * character between tokens as the character immediately following
905 * the token is altered in-place to a null-byte to terminate the
906 * token string.
907 */
908
909#define MAXARGC 20
910
911int kdb_parse(const char *cmdstr)
912{
913 static char *argv[MAXARGC];
914 static int argc;
915 static char cbuf[CMD_BUFLEN+2];
916 char *cp;
917 char *cpp, quoted;
918 kdbtab_t *tp;
919 int i, escaped, ignore_errors = 0, check_grep = 0;
920
921 /*
922 * First tokenize the command string.
923 */
924 cp = (char *)cmdstr;
925
926 if (KDB_FLAG(CMD_INTERRUPT)) {
927 /* Previous command was interrupted, newline must not
928 * repeat the command */
929 KDB_FLAG_CLEAR(CMD_INTERRUPT);
930 KDB_STATE_SET(PAGER);
931 argc = 0; /* no repeat */
932 }
933
934 if (*cp != '\n' && *cp != '\0') {
935 argc = 0;
936 cpp = cbuf;
937 while (*cp) {
938 /* skip whitespace */
939 while (isspace(*cp))
940 cp++;
941 if ((*cp == '\0') || (*cp == '\n') ||
942 (*cp == '#' && !defcmd_in_progress))
943 break;
944 /* special case: check for | grep pattern */
945 if (*cp == '|') {
946 check_grep++;
947 break;
948 }
949 if (cpp >= cbuf + CMD_BUFLEN) {
950 kdb_printf("kdb_parse: command buffer "
951 "overflow, command ignored\n%s\n",
952 cmdstr);
953 return KDB_NOTFOUND;
954 }
955 if (argc >= MAXARGC - 1) {
956 kdb_printf("kdb_parse: too many arguments, "
957 "command ignored\n%s\n", cmdstr);
958 return KDB_NOTFOUND;
959 }
960 argv[argc++] = cpp;
961 escaped = 0;
962 quoted = '\0';
963 /* Copy to next unquoted and unescaped
964 * whitespace or '=' */
965 while (*cp && *cp != '\n' &&
966 (escaped || quoted || !isspace(*cp))) {
967 if (cpp >= cbuf + CMD_BUFLEN)
968 break;
969 if (escaped) {
970 escaped = 0;
971 *cpp++ = *cp++;
972 continue;
973 }
974 if (*cp == '\\') {
975 escaped = 1;
976 ++cp;
977 continue;
978 }
979 if (*cp == quoted)
980 quoted = '\0';
981 else if (*cp == '\'' || *cp == '"')
982 quoted = *cp;
983 *cpp = *cp++;
984 if (*cpp == '=' && !quoted)
985 break;
986 ++cpp;
987 }
988 *cpp++ = '\0'; /* Squash a ws or '=' character */
989 }
990 }
991 if (!argc)
992 return 0;
993 if (check_grep)
994 parse_grep(cp);
995 if (defcmd_in_progress) {
996 int result = kdb_defcmd2(cmdstr, argv[0]);
997 if (!defcmd_in_progress) {
998 argc = 0; /* avoid repeat on endefcmd */
999 *(argv[0]) = '\0';
1000 }
1001 return result;
1002 }
1003 if (argv[0][0] == '-' && argv[0][1] &&
1004 (argv[0][1] < '0' || argv[0][1] > '9')) {
1005 ignore_errors = 1;
1006 ++argv[0];
1007 }
1008
1009 for_each_kdbcmd(tp, i) {
1010 if (tp->cmd_name) {
1011 /*
1012 * If this command is allowed to be abbreviated,
1013 * check to see if this is it.
1014 */
1015
1016 if (tp->cmd_minlen
1017 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1018 if (strncmp(argv[0],
1019 tp->cmd_name,
1020 tp->cmd_minlen) == 0) {
1021 break;
1022 }
1023 }
1024
1025 if (strcmp(argv[0], tp->cmd_name) == 0)
1026 break;
1027 }
1028 }
1029
1030 /*
1031 * If we don't find a command by this name, see if the first
1032 * few characters of this match any of the known commands.
1033 * e.g., md1c20 should match md.
1034 */
1035 if (i == kdb_max_commands) {
1036 for_each_kdbcmd(tp, i) {
1037 if (tp->cmd_name) {
1038 if (strncmp(argv[0],
1039 tp->cmd_name,
1040 strlen(tp->cmd_name)) == 0) {
1041 break;
1042 }
1043 }
1044 }
1045 }
1046
1047 if (i < kdb_max_commands) {
1048 int result;
1049
1050 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1051 return KDB_NOPERM;
1052
1053 KDB_STATE_SET(CMD);
1054 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1055 if (result && ignore_errors && result > KDB_CMD_GO)
1056 result = 0;
1057 KDB_STATE_CLEAR(CMD);
1058
1059 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1060 return result;
1061
1062 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1063 if (argv[argc])
1064 *(argv[argc]) = '\0';
1065 return result;
1066 }
1067
1068 /*
1069 * If the input with which we were presented does not
1070 * map to an existing command, attempt to parse it as an
1071 * address argument and display the result. Useful for
1072 * obtaining the address of a variable, or the nearest symbol
1073 * to an address contained in a register.
1074 */
1075 {
1076 unsigned long value;
1077 char *name = NULL;
1078 long offset;
1079 int nextarg = 0;
1080
1081 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1082 &value, &offset, &name)) {
1083 return KDB_NOTFOUND;
1084 }
1085
1086 kdb_printf("%s = ", argv[0]);
1087 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1088 kdb_printf("\n");
1089 return 0;
1090 }
1091}
1092
1093
1094static int handle_ctrl_cmd(char *cmd)
1095{
1096#define CTRL_P 16
1097#define CTRL_N 14
1098
1099 /* initial situation */
1100 if (cmd_head == cmd_tail)
1101 return 0;
1102 switch (*cmd) {
1103 case CTRL_P:
1104 if (cmdptr != cmd_tail)
1105 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1106 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1107 return 1;
1108 case CTRL_N:
1109 if (cmdptr != cmd_head)
1110 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1111 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1112 return 1;
1113 }
1114 return 0;
1115}
1116
1117/*
1118 * kdb_reboot - This function implements the 'reboot' command. Reboot
1119 * the system immediately, or loop for ever on failure.
1120 */
1121static int kdb_reboot(int argc, const char **argv)
1122{
1123 emergency_restart();
1124 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1125 while (1)
1126 cpu_relax();
1127 /* NOTREACHED */
1128 return 0;
1129}
1130
1131static void kdb_dumpregs(struct pt_regs *regs)
1132{
1133 int old_lvl = console_loglevel;
1134 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1135 kdb_trap_printk++;
1136 show_regs(regs);
1137 kdb_trap_printk--;
1138 kdb_printf("\n");
1139 console_loglevel = old_lvl;
1140}
1141
1142void kdb_set_current_task(struct task_struct *p)
1143{
1144 kdb_current_task = p;
1145
1146 if (kdb_task_has_cpu(p)) {
1147 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1148 return;
1149 }
1150 kdb_current_regs = NULL;
1151}
1152
1153static void drop_newline(char *buf)
1154{
1155 size_t len = strlen(buf);
1156
1157 if (len == 0)
1158 return;
1159 if (*(buf + len - 1) == '\n')
1160 *(buf + len - 1) = '\0';
1161}
1162
1163/*
1164 * kdb_local - The main code for kdb. This routine is invoked on a
1165 * specific processor, it is not global. The main kdb() routine
1166 * ensures that only one processor at a time is in this routine.
1167 * This code is called with the real reason code on the first
1168 * entry to a kdb session, thereafter it is called with reason
1169 * SWITCH, even if the user goes back to the original cpu.
1170 * Inputs:
1171 * reason The reason KDB was invoked
1172 * error The hardware-defined error code
1173 * regs The exception frame at time of fault/breakpoint.
1174 * db_result Result code from the break or debug point.
1175 * Returns:
1176 * 0 KDB was invoked for an event which it wasn't responsible
1177 * 1 KDB handled the event for which it was invoked.
1178 * KDB_CMD_GO User typed 'go'.
1179 * KDB_CMD_CPU User switched to another cpu.
1180 * KDB_CMD_SS Single step.
1181 */
1182static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1183 kdb_dbtrap_t db_result)
1184{
1185 char *cmdbuf;
1186 int diag;
1187 struct task_struct *kdb_current =
1188 kdb_curr_task(raw_smp_processor_id());
1189
1190 KDB_DEBUG_STATE("kdb_local 1", reason);
1191 kdb_go_count = 0;
1192 if (reason == KDB_REASON_DEBUG) {
1193 /* special case below */
1194 } else {
1195 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1196 kdb_current, kdb_current ? kdb_current->pid : 0);
1197#if defined(CONFIG_SMP)
1198 kdb_printf("on processor %d ", raw_smp_processor_id());
1199#endif
1200 }
1201
1202 switch (reason) {
1203 case KDB_REASON_DEBUG:
1204 {
1205 /*
1206 * If re-entering kdb after a single step
1207 * command, don't print the message.
1208 */
1209 switch (db_result) {
1210 case KDB_DB_BPT:
1211 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1212 kdb_current, kdb_current->pid);
1213#if defined(CONFIG_SMP)
1214 kdb_printf("on processor %d ", raw_smp_processor_id());
1215#endif
1216 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1217 instruction_pointer(regs));
1218 break;
1219 case KDB_DB_SS:
1220 break;
1221 case KDB_DB_SSBPT:
1222 KDB_DEBUG_STATE("kdb_local 4", reason);
1223 return 1; /* kdba_db_trap did the work */
1224 default:
1225 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1226 db_result);
1227 break;
1228 }
1229
1230 }
1231 break;
1232 case KDB_REASON_ENTER:
1233 if (KDB_STATE(KEYBOARD))
1234 kdb_printf("due to Keyboard Entry\n");
1235 else
1236 kdb_printf("due to KDB_ENTER()\n");
1237 break;
1238 case KDB_REASON_KEYBOARD:
1239 KDB_STATE_SET(KEYBOARD);
1240 kdb_printf("due to Keyboard Entry\n");
1241 break;
1242 case KDB_REASON_ENTER_SLAVE:
1243 /* drop through, slaves only get released via cpu switch */
1244 case KDB_REASON_SWITCH:
1245 kdb_printf("due to cpu switch\n");
1246 break;
1247 case KDB_REASON_OOPS:
1248 kdb_printf("Oops: %s\n", kdb_diemsg);
1249 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1250 instruction_pointer(regs));
1251 kdb_dumpregs(regs);
1252 break;
1253 case KDB_REASON_SYSTEM_NMI:
1254 kdb_printf("due to System NonMaskable Interrupt\n");
1255 break;
1256 case KDB_REASON_NMI:
1257 kdb_printf("due to NonMaskable Interrupt @ "
1258 kdb_machreg_fmt "\n",
1259 instruction_pointer(regs));
1260 break;
1261 case KDB_REASON_SSTEP:
1262 case KDB_REASON_BREAK:
1263 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1264 reason == KDB_REASON_BREAK ?
1265 "Breakpoint" : "SS trap", instruction_pointer(regs));
1266 /*
1267 * Determine if this breakpoint is one that we
1268 * are interested in.
1269 */
1270 if (db_result != KDB_DB_BPT) {
1271 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1272 db_result);
1273 KDB_DEBUG_STATE("kdb_local 6", reason);
1274 return 0; /* Not for us, dismiss it */
1275 }
1276 break;
1277 case KDB_REASON_RECURSE:
1278 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1279 instruction_pointer(regs));
1280 break;
1281 default:
1282 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1283 KDB_DEBUG_STATE("kdb_local 8", reason);
1284 return 0; /* Not for us, dismiss it */
1285 }
1286
1287 while (1) {
1288 /*
1289 * Initialize pager context.
1290 */
1291 kdb_nextline = 1;
1292 KDB_STATE_CLEAR(SUPPRESS);
1293 kdb_grepping_flag = 0;
1294 /* ensure the old search does not leak into '/' commands */
1295 kdb_grep_string[0] = '\0';
1296
1297 cmdbuf = cmd_cur;
1298 *cmdbuf = '\0';
1299 *(cmd_hist[cmd_head]) = '\0';
1300
1301do_full_getstr:
1302#if defined(CONFIG_SMP)
1303 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1304 raw_smp_processor_id());
1305#else
1306 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1307#endif
1308 if (defcmd_in_progress)
1309 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1310
1311 /*
1312 * Fetch command from keyboard
1313 */
1314 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1315 if (*cmdbuf != '\n') {
1316 if (*cmdbuf < 32) {
1317 if (cmdptr == cmd_head) {
1318 strncpy(cmd_hist[cmd_head], cmd_cur,
1319 CMD_BUFLEN);
1320 *(cmd_hist[cmd_head] +
1321 strlen(cmd_hist[cmd_head])-1) = '\0';
1322 }
1323 if (!handle_ctrl_cmd(cmdbuf))
1324 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1325 cmdbuf = cmd_cur;
1326 goto do_full_getstr;
1327 } else {
1328 strncpy(cmd_hist[cmd_head], cmd_cur,
1329 CMD_BUFLEN);
1330 }
1331
1332 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1333 if (cmd_head == cmd_tail)
1334 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1335 }
1336
1337 cmdptr = cmd_head;
1338 diag = kdb_parse(cmdbuf);
1339 if (diag == KDB_NOTFOUND) {
1340 drop_newline(cmdbuf);
1341 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1342 diag = 0;
1343 }
1344 if (diag == KDB_CMD_GO
1345 || diag == KDB_CMD_CPU
1346 || diag == KDB_CMD_SS
1347 || diag == KDB_CMD_KGDB)
1348 break;
1349
1350 if (diag)
1351 kdb_cmderror(diag);
1352 }
1353 KDB_DEBUG_STATE("kdb_local 9", diag);
1354 return diag;
1355}
1356
1357
1358/*
1359 * kdb_print_state - Print the state data for the current processor
1360 * for debugging.
1361 * Inputs:
1362 * text Identifies the debug point
1363 * value Any integer value to be printed, e.g. reason code.
1364 */
1365void kdb_print_state(const char *text, int value)
1366{
1367 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1368 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1369 kdb_state);
1370}
1371
1372/*
1373 * kdb_main_loop - After initial setup and assignment of the
1374 * controlling cpu, all cpus are in this loop. One cpu is in
1375 * control and will issue the kdb prompt, the others will spin
1376 * until 'go' or cpu switch.
1377 *
1378 * To get a consistent view of the kernel stacks for all
1379 * processes, this routine is invoked from the main kdb code via
1380 * an architecture specific routine. kdba_main_loop is
1381 * responsible for making the kernel stacks consistent for all
1382 * processes, there should be no difference between a blocked
1383 * process and a running process as far as kdb is concerned.
1384 * Inputs:
1385 * reason The reason KDB was invoked
1386 * error The hardware-defined error code
1387 * reason2 kdb's current reason code.
1388 * Initially error but can change
1389 * according to kdb state.
1390 * db_result Result code from break or debug point.
1391 * regs The exception frame at time of fault/breakpoint.
1392 * should always be valid.
1393 * Returns:
1394 * 0 KDB was invoked for an event which it wasn't responsible
1395 * 1 KDB handled the event for which it was invoked.
1396 */
1397int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1398 kdb_dbtrap_t db_result, struct pt_regs *regs)
1399{
1400 int result = 1;
1401 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1402 while (1) {
1403 /*
1404 * All processors except the one that is in control
1405 * will spin here.
1406 */
1407 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1408 while (KDB_STATE(HOLD_CPU)) {
1409 /* state KDB is turned off by kdb_cpu to see if the
1410 * other cpus are still live, each cpu in this loop
1411 * turns it back on.
1412 */
1413 if (!KDB_STATE(KDB))
1414 KDB_STATE_SET(KDB);
1415 }
1416
1417 KDB_STATE_CLEAR(SUPPRESS);
1418 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1419 if (KDB_STATE(LEAVING))
1420 break; /* Another cpu said 'go' */
1421 /* Still using kdb, this processor is in control */
1422 result = kdb_local(reason2, error, regs, db_result);
1423 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1424
1425 if (result == KDB_CMD_CPU)
1426 break;
1427
1428 if (result == KDB_CMD_SS) {
1429 KDB_STATE_SET(DOING_SS);
1430 break;
1431 }
1432
1433 if (result == KDB_CMD_KGDB) {
1434 if (!KDB_STATE(DOING_KGDB))
1435 kdb_printf("Entering please attach debugger "
1436 "or use $D#44+ or $3#33\n");
1437 break;
1438 }
1439 if (result && result != 1 && result != KDB_CMD_GO)
1440 kdb_printf("\nUnexpected kdb_local return code %d\n",
1441 result);
1442 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1443 break;
1444 }
1445 if (KDB_STATE(DOING_SS))
1446 KDB_STATE_CLEAR(SSBPT);
1447
1448 /* Clean up any keyboard devices before leaving */
1449 kdb_kbd_cleanup_state();
1450
1451 return result;
1452}
1453
1454/*
1455 * kdb_mdr - This function implements the guts of the 'mdr', memory
1456 * read command.
1457 * mdr <addr arg>,<byte count>
1458 * Inputs:
1459 * addr Start address
1460 * count Number of bytes
1461 * Returns:
1462 * Always 0. Any errors are detected and printed by kdb_getarea.
1463 */
1464static int kdb_mdr(unsigned long addr, unsigned int count)
1465{
1466 unsigned char c;
1467 while (count--) {
1468 if (kdb_getarea(c, addr))
1469 return 0;
1470 kdb_printf("%02x", c);
1471 addr++;
1472 }
1473 kdb_printf("\n");
1474 return 0;
1475}
1476
1477/*
1478 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1479 * 'md8' 'mdr' and 'mds' commands.
1480 *
1481 * md|mds [<addr arg> [<line count> [<radix>]]]
1482 * mdWcN [<addr arg> [<line count> [<radix>]]]
1483 * where W = is the width (1, 2, 4 or 8) and N is the count.
1484 * for eg., md1c20 reads 20 bytes, 1 at a time.
1485 * mdr <addr arg>,<byte count>
1486 */
1487static void kdb_md_line(const char *fmtstr, unsigned long addr,
1488 int symbolic, int nosect, int bytesperword,
1489 int num, int repeat, int phys)
1490{
1491 /* print just one line of data */
1492 kdb_symtab_t symtab;
1493 char cbuf[32];
1494 char *c = cbuf;
1495 int i;
1496 int j;
1497 unsigned long word;
1498
1499 memset(cbuf, '\0', sizeof(cbuf));
1500 if (phys)
1501 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1502 else
1503 kdb_printf(kdb_machreg_fmt0 " ", addr);
1504
1505 for (i = 0; i < num && repeat--; i++) {
1506 if (phys) {
1507 if (kdb_getphysword(&word, addr, bytesperword))
1508 break;
1509 } else if (kdb_getword(&word, addr, bytesperword))
1510 break;
1511 kdb_printf(fmtstr, word);
1512 if (symbolic)
1513 kdbnearsym(word, &symtab);
1514 else
1515 memset(&symtab, 0, sizeof(symtab));
1516 if (symtab.sym_name) {
1517 kdb_symbol_print(word, &symtab, 0);
1518 if (!nosect) {
1519 kdb_printf("\n");
1520 kdb_printf(" %s %s "
1521 kdb_machreg_fmt " "
1522 kdb_machreg_fmt " "
1523 kdb_machreg_fmt, symtab.mod_name,
1524 symtab.sec_name, symtab.sec_start,
1525 symtab.sym_start, symtab.sym_end);
1526 }
1527 addr += bytesperword;
1528 } else {
1529 union {
1530 u64 word;
1531 unsigned char c[8];
1532 } wc;
1533 unsigned char *cp;
1534#ifdef __BIG_ENDIAN
1535 cp = wc.c + 8 - bytesperword;
1536#else
1537 cp = wc.c;
1538#endif
1539 wc.word = word;
1540#define printable_char(c) \
1541 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1542 for (j = 0; j < bytesperword; j++)
1543 *c++ = printable_char(*cp++);
1544 addr += bytesperword;
1545#undef printable_char
1546 }
1547 }
1548 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1549 " ", cbuf);
1550}
1551
1552static int kdb_md(int argc, const char **argv)
1553{
1554 static unsigned long last_addr;
1555 static int last_radix, last_bytesperword, last_repeat;
1556 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1557 int nosect = 0;
1558 char fmtchar, fmtstr[64];
1559 unsigned long addr;
1560 unsigned long word;
1561 long offset = 0;
1562 int symbolic = 0;
1563 int valid = 0;
1564 int phys = 0;
1565 int raw = 0;
1566
1567 kdbgetintenv("MDCOUNT", &mdcount);
1568 kdbgetintenv("RADIX", &radix);
1569 kdbgetintenv("BYTESPERWORD", &bytesperword);
1570
1571 /* Assume 'md <addr>' and start with environment values */
1572 repeat = mdcount * 16 / bytesperword;
1573
1574 if (strcmp(argv[0], "mdr") == 0) {
1575 if (argc == 2 || (argc == 0 && last_addr != 0))
1576 valid = raw = 1;
1577 else
1578 return KDB_ARGCOUNT;
1579 } else if (isdigit(argv[0][2])) {
1580 bytesperword = (int)(argv[0][2] - '0');
1581 if (bytesperword == 0) {
1582 bytesperword = last_bytesperword;
1583 if (bytesperword == 0)
1584 bytesperword = 4;
1585 }
1586 last_bytesperword = bytesperword;
1587 repeat = mdcount * 16 / bytesperword;
1588 if (!argv[0][3])
1589 valid = 1;
1590 else if (argv[0][3] == 'c' && argv[0][4]) {
1591 char *p;
1592 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1593 mdcount = ((repeat * bytesperword) + 15) / 16;
1594 valid = !*p;
1595 }
1596 last_repeat = repeat;
1597 } else if (strcmp(argv[0], "md") == 0)
1598 valid = 1;
1599 else if (strcmp(argv[0], "mds") == 0)
1600 valid = 1;
1601 else if (strcmp(argv[0], "mdp") == 0) {
1602 phys = valid = 1;
1603 }
1604 if (!valid)
1605 return KDB_NOTFOUND;
1606
1607 if (argc == 0) {
1608 if (last_addr == 0)
1609 return KDB_ARGCOUNT;
1610 addr = last_addr;
1611 radix = last_radix;
1612 bytesperword = last_bytesperword;
1613 repeat = last_repeat;
1614 if (raw)
1615 mdcount = repeat;
1616 else
1617 mdcount = ((repeat * bytesperword) + 15) / 16;
1618 }
1619
1620 if (argc) {
1621 unsigned long val;
1622 int diag, nextarg = 1;
1623 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1624 &offset, NULL);
1625 if (diag)
1626 return diag;
1627 if (argc > nextarg+2)
1628 return KDB_ARGCOUNT;
1629
1630 if (argc >= nextarg) {
1631 diag = kdbgetularg(argv[nextarg], &val);
1632 if (!diag) {
1633 mdcount = (int) val;
1634 if (raw)
1635 repeat = mdcount;
1636 else
1637 repeat = mdcount * 16 / bytesperword;
1638 }
1639 }
1640 if (argc >= nextarg+1) {
1641 diag = kdbgetularg(argv[nextarg+1], &val);
1642 if (!diag)
1643 radix = (int) val;
1644 }
1645 }
1646
1647 if (strcmp(argv[0], "mdr") == 0) {
1648 int ret;
1649 last_addr = addr;
1650 ret = kdb_mdr(addr, mdcount);
1651 last_addr += mdcount;
1652 last_repeat = mdcount;
1653 last_bytesperword = bytesperword; // to make REPEAT happy
1654 return ret;
1655 }
1656
1657 switch (radix) {
1658 case 10:
1659 fmtchar = 'd';
1660 break;
1661 case 16:
1662 fmtchar = 'x';
1663 break;
1664 case 8:
1665 fmtchar = 'o';
1666 break;
1667 default:
1668 return KDB_BADRADIX;
1669 }
1670
1671 last_radix = radix;
1672
1673 if (bytesperword > KDB_WORD_SIZE)
1674 return KDB_BADWIDTH;
1675
1676 switch (bytesperword) {
1677 case 8:
1678 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1679 break;
1680 case 4:
1681 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1682 break;
1683 case 2:
1684 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1685 break;
1686 case 1:
1687 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1688 break;
1689 default:
1690 return KDB_BADWIDTH;
1691 }
1692
1693 last_repeat = repeat;
1694 last_bytesperword = bytesperword;
1695
1696 if (strcmp(argv[0], "mds") == 0) {
1697 symbolic = 1;
1698 /* Do not save these changes as last_*, they are temporary mds
1699 * overrides.
1700 */
1701 bytesperword = KDB_WORD_SIZE;
1702 repeat = mdcount;
1703 kdbgetintenv("NOSECT", &nosect);
1704 }
1705
1706 /* Round address down modulo BYTESPERWORD */
1707
1708 addr &= ~(bytesperword-1);
1709
1710 while (repeat > 0) {
1711 unsigned long a;
1712 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1713
1714 if (KDB_FLAG(CMD_INTERRUPT))
1715 return 0;
1716 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1717 if (phys) {
1718 if (kdb_getphysword(&word, a, bytesperword)
1719 || word)
1720 break;
1721 } else if (kdb_getword(&word, a, bytesperword) || word)
1722 break;
1723 }
1724 n = min(num, repeat);
1725 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1726 num, repeat, phys);
1727 addr += bytesperword * n;
1728 repeat -= n;
1729 z = (z + num - 1) / num;
1730 if (z > 2) {
1731 int s = num * (z-2);
1732 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1733 " zero suppressed\n",
1734 addr, addr + bytesperword * s - 1);
1735 addr += bytesperword * s;
1736 repeat -= s;
1737 }
1738 }
1739 last_addr = addr;
1740
1741 return 0;
1742}
1743
1744/*
1745 * kdb_mm - This function implements the 'mm' command.
1746 * mm address-expression new-value
1747 * Remarks:
1748 * mm works on machine words, mmW works on bytes.
1749 */
1750static int kdb_mm(int argc, const char **argv)
1751{
1752 int diag;
1753 unsigned long addr;
1754 long offset = 0;
1755 unsigned long contents;
1756 int nextarg;
1757 int width;
1758
1759 if (argv[0][2] && !isdigit(argv[0][2]))
1760 return KDB_NOTFOUND;
1761
1762 if (argc < 2)
1763 return KDB_ARGCOUNT;
1764
1765 nextarg = 1;
1766 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1767 if (diag)
1768 return diag;
1769
1770 if (nextarg > argc)
1771 return KDB_ARGCOUNT;
1772 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1773 if (diag)
1774 return diag;
1775
1776 if (nextarg != argc + 1)
1777 return KDB_ARGCOUNT;
1778
1779 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1780 diag = kdb_putword(addr, contents, width);
1781 if (diag)
1782 return diag;
1783
1784 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1785
1786 return 0;
1787}
1788
1789/*
1790 * kdb_go - This function implements the 'go' command.
1791 * go [address-expression]
1792 */
1793static int kdb_go(int argc, const char **argv)
1794{
1795 unsigned long addr;
1796 int diag;
1797 int nextarg;
1798 long offset;
1799
1800 if (raw_smp_processor_id() != kdb_initial_cpu) {
1801 kdb_printf("go must execute on the entry cpu, "
1802 "please use \"cpu %d\" and then execute go\n",
1803 kdb_initial_cpu);
1804 return KDB_BADCPUNUM;
1805 }
1806 if (argc == 1) {
1807 nextarg = 1;
1808 diag = kdbgetaddrarg(argc, argv, &nextarg,
1809 &addr, &offset, NULL);
1810 if (diag)
1811 return diag;
1812 } else if (argc) {
1813 return KDB_ARGCOUNT;
1814 }
1815
1816 diag = KDB_CMD_GO;
1817 if (KDB_FLAG(CATASTROPHIC)) {
1818 kdb_printf("Catastrophic error detected\n");
1819 kdb_printf("kdb_continue_catastrophic=%d, ",
1820 kdb_continue_catastrophic);
1821 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1822 kdb_printf("type go a second time if you really want "
1823 "to continue\n");
1824 return 0;
1825 }
1826 if (kdb_continue_catastrophic == 2) {
1827 kdb_printf("forcing reboot\n");
1828 kdb_reboot(0, NULL);
1829 }
1830 kdb_printf("attempting to continue\n");
1831 }
1832 return diag;
1833}
1834
1835/*
1836 * kdb_rd - This function implements the 'rd' command.
1837 */
1838static int kdb_rd(int argc, const char **argv)
1839{
1840 int len = kdb_check_regs();
1841#if DBG_MAX_REG_NUM > 0
1842 int i;
1843 char *rname;
1844 int rsize;
1845 u64 reg64;
1846 u32 reg32;
1847 u16 reg16;
1848 u8 reg8;
1849
1850 if (len)
1851 return len;
1852
1853 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1854 rsize = dbg_reg_def[i].size * 2;
1855 if (rsize > 16)
1856 rsize = 2;
1857 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1858 len = 0;
1859 kdb_printf("\n");
1860 }
1861 if (len)
1862 len += kdb_printf(" ");
1863 switch(dbg_reg_def[i].size * 8) {
1864 case 8:
1865 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1866 if (!rname)
1867 break;
1868 len += kdb_printf("%s: %02x", rname, reg8);
1869 break;
1870 case 16:
1871 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1872 if (!rname)
1873 break;
1874 len += kdb_printf("%s: %04x", rname, reg16);
1875 break;
1876 case 32:
1877 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1878 if (!rname)
1879 break;
1880 len += kdb_printf("%s: %08x", rname, reg32);
1881 break;
1882 case 64:
1883 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1884 if (!rname)
1885 break;
1886 len += kdb_printf("%s: %016llx", rname, reg64);
1887 break;
1888 default:
1889 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1890 }
1891 }
1892 kdb_printf("\n");
1893#else
1894 if (len)
1895 return len;
1896
1897 kdb_dumpregs(kdb_current_regs);
1898#endif
1899 return 0;
1900}
1901
1902/*
1903 * kdb_rm - This function implements the 'rm' (register modify) command.
1904 * rm register-name new-contents
1905 * Remarks:
1906 * Allows register modification with the same restrictions as gdb
1907 */
1908static int kdb_rm(int argc, const char **argv)
1909{
1910#if DBG_MAX_REG_NUM > 0
1911 int diag;
1912 const char *rname;
1913 int i;
1914 u64 reg64;
1915 u32 reg32;
1916 u16 reg16;
1917 u8 reg8;
1918
1919 if (argc != 2)
1920 return KDB_ARGCOUNT;
1921 /*
1922 * Allow presence or absence of leading '%' symbol.
1923 */
1924 rname = argv[1];
1925 if (*rname == '%')
1926 rname++;
1927
1928 diag = kdbgetu64arg(argv[2], ®64);
1929 if (diag)
1930 return diag;
1931
1932 diag = kdb_check_regs();
1933 if (diag)
1934 return diag;
1935
1936 diag = KDB_BADREG;
1937 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1938 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1939 diag = 0;
1940 break;
1941 }
1942 }
1943 if (!diag) {
1944 switch(dbg_reg_def[i].size * 8) {
1945 case 8:
1946 reg8 = reg64;
1947 dbg_set_reg(i, ®8, kdb_current_regs);
1948 break;
1949 case 16:
1950 reg16 = reg64;
1951 dbg_set_reg(i, ®16, kdb_current_regs);
1952 break;
1953 case 32:
1954 reg32 = reg64;
1955 dbg_set_reg(i, ®32, kdb_current_regs);
1956 break;
1957 case 64:
1958 dbg_set_reg(i, ®64, kdb_current_regs);
1959 break;
1960 }
1961 }
1962 return diag;
1963#else
1964 kdb_printf("ERROR: Register set currently not implemented\n");
1965 return 0;
1966#endif
1967}
1968
1969#if defined(CONFIG_MAGIC_SYSRQ)
1970/*
1971 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1972 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1973 * sr <magic-sysrq-code>
1974 */
1975static int kdb_sr(int argc, const char **argv)
1976{
1977 bool check_mask =
1978 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1979
1980 if (argc != 1)
1981 return KDB_ARGCOUNT;
1982
1983 kdb_trap_printk++;
1984 __handle_sysrq(*argv[1], check_mask);
1985 kdb_trap_printk--;
1986
1987 return 0;
1988}
1989#endif /* CONFIG_MAGIC_SYSRQ */
1990
1991/*
1992 * kdb_ef - This function implements the 'regs' (display exception
1993 * frame) command. This command takes an address and expects to
1994 * find an exception frame at that address, formats and prints
1995 * it.
1996 * regs address-expression
1997 * Remarks:
1998 * Not done yet.
1999 */
2000static int kdb_ef(int argc, const char **argv)
2001{
2002 int diag;
2003 unsigned long addr;
2004 long offset;
2005 int nextarg;
2006
2007 if (argc != 1)
2008 return KDB_ARGCOUNT;
2009
2010 nextarg = 1;
2011 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2012 if (diag)
2013 return diag;
2014 show_regs((struct pt_regs *)addr);
2015 return 0;
2016}
2017
2018#if defined(CONFIG_MODULES)
2019/*
2020 * kdb_lsmod - This function implements the 'lsmod' command. Lists
2021 * currently loaded kernel modules.
2022 * Mostly taken from userland lsmod.
2023 */
2024static int kdb_lsmod(int argc, const char **argv)
2025{
2026 struct module *mod;
2027
2028 if (argc != 0)
2029 return KDB_ARGCOUNT;
2030
2031 kdb_printf("Module Size modstruct Used by\n");
2032 list_for_each_entry(mod, kdb_modules, list) {
2033 if (mod->state == MODULE_STATE_UNFORMED)
2034 continue;
2035
2036 kdb_printf("%-20s%8u 0x%px ", mod->name,
2037 mod->core_layout.size, (void *)mod);
2038#ifdef CONFIG_MODULE_UNLOAD
2039 kdb_printf("%4d ", module_refcount(mod));
2040#endif
2041 if (mod->state == MODULE_STATE_GOING)
2042 kdb_printf(" (Unloading)");
2043 else if (mod->state == MODULE_STATE_COMING)
2044 kdb_printf(" (Loading)");
2045 else
2046 kdb_printf(" (Live)");
2047 kdb_printf(" 0x%px", mod->core_layout.base);
2048
2049#ifdef CONFIG_MODULE_UNLOAD
2050 {
2051 struct module_use *use;
2052 kdb_printf(" [ ");
2053 list_for_each_entry(use, &mod->source_list,
2054 source_list)
2055 kdb_printf("%s ", use->target->name);
2056 kdb_printf("]\n");
2057 }
2058#endif
2059 }
2060
2061 return 0;
2062}
2063
2064#endif /* CONFIG_MODULES */
2065
2066/*
2067 * kdb_env - This function implements the 'env' command. Display the
2068 * current environment variables.
2069 */
2070
2071static int kdb_env(int argc, const char **argv)
2072{
2073 int i;
2074
2075 for (i = 0; i < __nenv; i++) {
2076 if (__env[i])
2077 kdb_printf("%s\n", __env[i]);
2078 }
2079
2080 if (KDB_DEBUG(MASK))
2081 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2082
2083 return 0;
2084}
2085
2086#ifdef CONFIG_PRINTK
2087/*
2088 * kdb_dmesg - This function implements the 'dmesg' command to display
2089 * the contents of the syslog buffer.
2090 * dmesg [lines] [adjust]
2091 */
2092static int kdb_dmesg(int argc, const char **argv)
2093{
2094 int diag;
2095 int logging;
2096 int lines = 0;
2097 int adjust = 0;
2098 int n = 0;
2099 int skip = 0;
2100 struct kmsg_dumper dumper = { .active = 1 };
2101 size_t len;
2102 char buf[201];
2103
2104 if (argc > 2)
2105 return KDB_ARGCOUNT;
2106 if (argc) {
2107 char *cp;
2108 lines = simple_strtol(argv[1], &cp, 0);
2109 if (*cp)
2110 lines = 0;
2111 if (argc > 1) {
2112 adjust = simple_strtoul(argv[2], &cp, 0);
2113 if (*cp || adjust < 0)
2114 adjust = 0;
2115 }
2116 }
2117
2118 /* disable LOGGING if set */
2119 diag = kdbgetintenv("LOGGING", &logging);
2120 if (!diag && logging) {
2121 const char *setargs[] = { "set", "LOGGING", "0" };
2122 kdb_set(2, setargs);
2123 }
2124
2125 kmsg_dump_rewind_nolock(&dumper);
2126 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2127 n++;
2128
2129 if (lines < 0) {
2130 if (adjust >= n)
2131 kdb_printf("buffer only contains %d lines, nothing "
2132 "printed\n", n);
2133 else if (adjust - lines >= n)
2134 kdb_printf("buffer only contains %d lines, last %d "
2135 "lines printed\n", n, n - adjust);
2136 skip = adjust;
2137 lines = abs(lines);
2138 } else if (lines > 0) {
2139 skip = n - lines - adjust;
2140 lines = abs(lines);
2141 if (adjust >= n) {
2142 kdb_printf("buffer only contains %d lines, "
2143 "nothing printed\n", n);
2144 skip = n;
2145 } else if (skip < 0) {
2146 lines += skip;
2147 skip = 0;
2148 kdb_printf("buffer only contains %d lines, first "
2149 "%d lines printed\n", n, lines);
2150 }
2151 } else {
2152 lines = n;
2153 }
2154
2155 if (skip >= n || skip < 0)
2156 return 0;
2157
2158 kmsg_dump_rewind_nolock(&dumper);
2159 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2160 if (skip) {
2161 skip--;
2162 continue;
2163 }
2164 if (!lines--)
2165 break;
2166 if (KDB_FLAG(CMD_INTERRUPT))
2167 return 0;
2168
2169 kdb_printf("%.*s\n", (int)len - 1, buf);
2170 }
2171
2172 return 0;
2173}
2174#endif /* CONFIG_PRINTK */
2175
2176/* Make sure we balance enable/disable calls, must disable first. */
2177static atomic_t kdb_nmi_disabled;
2178
2179static int kdb_disable_nmi(int argc, const char *argv[])
2180{
2181 if (atomic_read(&kdb_nmi_disabled))
2182 return 0;
2183 atomic_set(&kdb_nmi_disabled, 1);
2184 arch_kgdb_ops.enable_nmi(0);
2185 return 0;
2186}
2187
2188static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2189{
2190 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2191 return -EINVAL;
2192 arch_kgdb_ops.enable_nmi(1);
2193 return 0;
2194}
2195
2196static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2197 .set = kdb_param_enable_nmi,
2198};
2199module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2200
2201/*
2202 * kdb_cpu - This function implements the 'cpu' command.
2203 * cpu [<cpunum>]
2204 * Returns:
2205 * KDB_CMD_CPU for success, a kdb diagnostic if error
2206 */
2207static void kdb_cpu_status(void)
2208{
2209 int i, start_cpu, first_print = 1;
2210 char state, prev_state = '?';
2211
2212 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2213 kdb_printf("Available cpus: ");
2214 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2215 if (!cpu_online(i)) {
2216 state = 'F'; /* cpu is offline */
2217 } else if (!kgdb_info[i].enter_kgdb) {
2218 state = 'D'; /* cpu is online but unresponsive */
2219 } else {
2220 state = ' '; /* cpu is responding to kdb */
2221 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2222 state = 'I'; /* idle task */
2223 }
2224 if (state != prev_state) {
2225 if (prev_state != '?') {
2226 if (!first_print)
2227 kdb_printf(", ");
2228 first_print = 0;
2229 kdb_printf("%d", start_cpu);
2230 if (start_cpu < i-1)
2231 kdb_printf("-%d", i-1);
2232 if (prev_state != ' ')
2233 kdb_printf("(%c)", prev_state);
2234 }
2235 prev_state = state;
2236 start_cpu = i;
2237 }
2238 }
2239 /* print the trailing cpus, ignoring them if they are all offline */
2240 if (prev_state != 'F') {
2241 if (!first_print)
2242 kdb_printf(", ");
2243 kdb_printf("%d", start_cpu);
2244 if (start_cpu < i-1)
2245 kdb_printf("-%d", i-1);
2246 if (prev_state != ' ')
2247 kdb_printf("(%c)", prev_state);
2248 }
2249 kdb_printf("\n");
2250}
2251
2252static int kdb_cpu(int argc, const char **argv)
2253{
2254 unsigned long cpunum;
2255 int diag;
2256
2257 if (argc == 0) {
2258 kdb_cpu_status();
2259 return 0;
2260 }
2261
2262 if (argc != 1)
2263 return KDB_ARGCOUNT;
2264
2265 diag = kdbgetularg(argv[1], &cpunum);
2266 if (diag)
2267 return diag;
2268
2269 /*
2270 * Validate cpunum
2271 */
2272 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2273 return KDB_BADCPUNUM;
2274
2275 dbg_switch_cpu = cpunum;
2276
2277 /*
2278 * Switch to other cpu
2279 */
2280 return KDB_CMD_CPU;
2281}
2282
2283/* The user may not realize that ps/bta with no parameters does not print idle
2284 * or sleeping system daemon processes, so tell them how many were suppressed.
2285 */
2286void kdb_ps_suppressed(void)
2287{
2288 int idle = 0, daemon = 0;
2289 unsigned long mask_I = kdb_task_state_string("I"),
2290 mask_M = kdb_task_state_string("M");
2291 unsigned long cpu;
2292 const struct task_struct *p, *g;
2293 for_each_online_cpu(cpu) {
2294 p = kdb_curr_task(cpu);
2295 if (kdb_task_state(p, mask_I))
2296 ++idle;
2297 }
2298 kdb_do_each_thread(g, p) {
2299 if (kdb_task_state(p, mask_M))
2300 ++daemon;
2301 } kdb_while_each_thread(g, p);
2302 if (idle || daemon) {
2303 if (idle)
2304 kdb_printf("%d idle process%s (state I)%s\n",
2305 idle, idle == 1 ? "" : "es",
2306 daemon ? " and " : "");
2307 if (daemon)
2308 kdb_printf("%d sleeping system daemon (state M) "
2309 "process%s", daemon,
2310 daemon == 1 ? "" : "es");
2311 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2312 }
2313}
2314
2315/*
2316 * kdb_ps - This function implements the 'ps' command which shows a
2317 * list of the active processes.
2318 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2319 */
2320void kdb_ps1(const struct task_struct *p)
2321{
2322 int cpu;
2323 unsigned long tmp;
2324
2325 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2326 return;
2327
2328 cpu = kdb_process_cpu(p);
2329 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2330 (void *)p, p->pid, p->parent->pid,
2331 kdb_task_has_cpu(p), kdb_process_cpu(p),
2332 kdb_task_state_char(p),
2333 (void *)(&p->thread),
2334 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2335 p->comm);
2336 if (kdb_task_has_cpu(p)) {
2337 if (!KDB_TSK(cpu)) {
2338 kdb_printf(" Error: no saved data for this cpu\n");
2339 } else {
2340 if (KDB_TSK(cpu) != p)
2341 kdb_printf(" Error: does not match running "
2342 "process table (0x%px)\n", KDB_TSK(cpu));
2343 }
2344 }
2345}
2346
2347static int kdb_ps(int argc, const char **argv)
2348{
2349 struct task_struct *g, *p;
2350 unsigned long mask, cpu;
2351
2352 if (argc == 0)
2353 kdb_ps_suppressed();
2354 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2355 (int)(2*sizeof(void *))+2, "Task Addr",
2356 (int)(2*sizeof(void *))+2, "Thread");
2357 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2358 /* Run the active tasks first */
2359 for_each_online_cpu(cpu) {
2360 if (KDB_FLAG(CMD_INTERRUPT))
2361 return 0;
2362 p = kdb_curr_task(cpu);
2363 if (kdb_task_state(p, mask))
2364 kdb_ps1(p);
2365 }
2366 kdb_printf("\n");
2367 /* Now the real tasks */
2368 kdb_do_each_thread(g, p) {
2369 if (KDB_FLAG(CMD_INTERRUPT))
2370 return 0;
2371 if (kdb_task_state(p, mask))
2372 kdb_ps1(p);
2373 } kdb_while_each_thread(g, p);
2374
2375 return 0;
2376}
2377
2378/*
2379 * kdb_pid - This function implements the 'pid' command which switches
2380 * the currently active process.
2381 * pid [<pid> | R]
2382 */
2383static int kdb_pid(int argc, const char **argv)
2384{
2385 struct task_struct *p;
2386 unsigned long val;
2387 int diag;
2388
2389 if (argc > 1)
2390 return KDB_ARGCOUNT;
2391
2392 if (argc) {
2393 if (strcmp(argv[1], "R") == 0) {
2394 p = KDB_TSK(kdb_initial_cpu);
2395 } else {
2396 diag = kdbgetularg(argv[1], &val);
2397 if (diag)
2398 return KDB_BADINT;
2399
2400 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2401 if (!p) {
2402 kdb_printf("No task with pid=%d\n", (pid_t)val);
2403 return 0;
2404 }
2405 }
2406 kdb_set_current_task(p);
2407 }
2408 kdb_printf("KDB current process is %s(pid=%d)\n",
2409 kdb_current_task->comm,
2410 kdb_current_task->pid);
2411
2412 return 0;
2413}
2414
2415static int kdb_kgdb(int argc, const char **argv)
2416{
2417 return KDB_CMD_KGDB;
2418}
2419
2420/*
2421 * kdb_help - This function implements the 'help' and '?' commands.
2422 */
2423static int kdb_help(int argc, const char **argv)
2424{
2425 kdbtab_t *kt;
2426 int i;
2427
2428 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2429 kdb_printf("-----------------------------"
2430 "-----------------------------\n");
2431 for_each_kdbcmd(kt, i) {
2432 char *space = "";
2433 if (KDB_FLAG(CMD_INTERRUPT))
2434 return 0;
2435 if (!kt->cmd_name)
2436 continue;
2437 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2438 continue;
2439 if (strlen(kt->cmd_usage) > 20)
2440 space = "\n ";
2441 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2442 kt->cmd_usage, space, kt->cmd_help);
2443 }
2444 return 0;
2445}
2446
2447/*
2448 * kdb_kill - This function implements the 'kill' commands.
2449 */
2450static int kdb_kill(int argc, const char **argv)
2451{
2452 long sig, pid;
2453 char *endp;
2454 struct task_struct *p;
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) || !valid_signal(-sig)) {
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 kdb_send_sig(p, sig);
2484 return 0;
2485}
2486
2487/*
2488 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2489 * I cannot call that code directly from kdb, it has an unconditional
2490 * cli()/sti() and calls routines that take locks which can stop the debugger.
2491 */
2492static void kdb_sysinfo(struct sysinfo *val)
2493{
2494 u64 uptime = ktime_get_mono_fast_ns();
2495
2496 memset(val, 0, sizeof(*val));
2497 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2498 val->loads[0] = avenrun[0];
2499 val->loads[1] = avenrun[1];
2500 val->loads[2] = avenrun[2];
2501 val->procs = nr_threads-1;
2502 si_meminfo(val);
2503
2504 return;
2505}
2506
2507/*
2508 * kdb_summary - This function implements the 'summary' command.
2509 */
2510static int kdb_summary(int argc, const char **argv)
2511{
2512 time64_t now;
2513 struct tm tm;
2514 struct sysinfo val;
2515
2516 if (argc)
2517 return KDB_ARGCOUNT;
2518
2519 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2520 kdb_printf("release %s\n", init_uts_ns.name.release);
2521 kdb_printf("version %s\n", init_uts_ns.name.version);
2522 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2523 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2524 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2525
2526 now = __ktime_get_real_seconds();
2527 time64_to_tm(now, 0, &tm);
2528 kdb_printf("date %04ld-%02d-%02d %02d:%02d:%02d "
2529 "tz_minuteswest %d\n",
2530 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2531 tm.tm_hour, tm.tm_min, tm.tm_sec,
2532 sys_tz.tz_minuteswest);
2533
2534 kdb_sysinfo(&val);
2535 kdb_printf("uptime ");
2536 if (val.uptime > (24*60*60)) {
2537 int days = val.uptime / (24*60*60);
2538 val.uptime %= (24*60*60);
2539 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2540 }
2541 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2542
2543 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2544 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2545 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2546 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2547
2548 /* Display in kilobytes */
2549#define K(x) ((x) << (PAGE_SHIFT - 10))
2550 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2551 "Buffers: %8lu kB\n",
2552 K(val.totalram), K(val.freeram), K(val.bufferram));
2553 return 0;
2554}
2555
2556/*
2557 * kdb_per_cpu - This function implements the 'per_cpu' command.
2558 */
2559static int kdb_per_cpu(int argc, const char **argv)
2560{
2561 char fmtstr[64];
2562 int cpu, diag, nextarg = 1;
2563 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2564
2565 if (argc < 1 || argc > 3)
2566 return KDB_ARGCOUNT;
2567
2568 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2569 if (diag)
2570 return diag;
2571
2572 if (argc >= 2) {
2573 diag = kdbgetularg(argv[2], &bytesperword);
2574 if (diag)
2575 return diag;
2576 }
2577 if (!bytesperword)
2578 bytesperword = KDB_WORD_SIZE;
2579 else if (bytesperword > KDB_WORD_SIZE)
2580 return KDB_BADWIDTH;
2581 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2582 if (argc >= 3) {
2583 diag = kdbgetularg(argv[3], &whichcpu);
2584 if (diag)
2585 return diag;
2586 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2587 kdb_printf("cpu %ld is not online\n", whichcpu);
2588 return KDB_BADCPUNUM;
2589 }
2590 }
2591
2592 /* Most architectures use __per_cpu_offset[cpu], some use
2593 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2594 */
2595#ifdef __per_cpu_offset
2596#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2597#else
2598#ifdef CONFIG_SMP
2599#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2600#else
2601#define KDB_PCU(cpu) 0
2602#endif
2603#endif
2604 for_each_online_cpu(cpu) {
2605 if (KDB_FLAG(CMD_INTERRUPT))
2606 return 0;
2607
2608 if (whichcpu != ~0UL && whichcpu != cpu)
2609 continue;
2610 addr = symaddr + KDB_PCU(cpu);
2611 diag = kdb_getword(&val, addr, bytesperword);
2612 if (diag) {
2613 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2614 "read, diag=%d\n", cpu, addr, diag);
2615 continue;
2616 }
2617 kdb_printf("%5d ", cpu);
2618 kdb_md_line(fmtstr, addr,
2619 bytesperword == KDB_WORD_SIZE,
2620 1, bytesperword, 1, 1, 0);
2621 }
2622#undef KDB_PCU
2623 return 0;
2624}
2625
2626/*
2627 * display help for the use of cmd | grep pattern
2628 */
2629static int kdb_grep_help(int argc, const char **argv)
2630{
2631 kdb_printf("Usage of cmd args | grep pattern:\n");
2632 kdb_printf(" Any command's output may be filtered through an ");
2633 kdb_printf("emulated 'pipe'.\n");
2634 kdb_printf(" 'grep' is just a key word.\n");
2635 kdb_printf(" The pattern may include a very limited set of "
2636 "metacharacters:\n");
2637 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2638 kdb_printf(" And if there are spaces in the pattern, you may "
2639 "quote it:\n");
2640 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2641 " or \"^pat tern$\"\n");
2642 return 0;
2643}
2644
2645/*
2646 * kdb_register_flags - This function is used to register a kernel
2647 * debugger command.
2648 * Inputs:
2649 * cmd Command name
2650 * func Function to execute the command
2651 * usage A simple usage string showing arguments
2652 * help A simple help string describing command
2653 * repeat Does the command auto repeat on enter?
2654 * Returns:
2655 * zero for success, one if a duplicate command.
2656 */
2657#define kdb_command_extend 50 /* arbitrary */
2658int kdb_register_flags(char *cmd,
2659 kdb_func_t func,
2660 char *usage,
2661 char *help,
2662 short minlen,
2663 kdb_cmdflags_t flags)
2664{
2665 int i;
2666 kdbtab_t *kp;
2667
2668 /*
2669 * Brute force method to determine duplicates
2670 */
2671 for_each_kdbcmd(kp, i) {
2672 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2673 kdb_printf("Duplicate kdb command registered: "
2674 "%s, func %px help %s\n", cmd, func, help);
2675 return 1;
2676 }
2677 }
2678
2679 /*
2680 * Insert command into first available location in table
2681 */
2682 for_each_kdbcmd(kp, i) {
2683 if (kp->cmd_name == NULL)
2684 break;
2685 }
2686
2687 if (i >= kdb_max_commands) {
2688 kdbtab_t *new = kmalloc_array(kdb_max_commands -
2689 KDB_BASE_CMD_MAX +
2690 kdb_command_extend,
2691 sizeof(*new),
2692 GFP_KDB);
2693 if (!new) {
2694 kdb_printf("Could not allocate new kdb_command "
2695 "table\n");
2696 return 1;
2697 }
2698 if (kdb_commands) {
2699 memcpy(new, kdb_commands,
2700 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2701 kfree(kdb_commands);
2702 }
2703 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2704 kdb_command_extend * sizeof(*new));
2705 kdb_commands = new;
2706 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2707 kdb_max_commands += kdb_command_extend;
2708 }
2709
2710 kp->cmd_name = cmd;
2711 kp->cmd_func = func;
2712 kp->cmd_usage = usage;
2713 kp->cmd_help = help;
2714 kp->cmd_minlen = minlen;
2715 kp->cmd_flags = flags;
2716
2717 return 0;
2718}
2719EXPORT_SYMBOL_GPL(kdb_register_flags);
2720
2721
2722/*
2723 * kdb_register - Compatibility register function for commands that do
2724 * not need to specify a repeat state. Equivalent to
2725 * kdb_register_flags with flags set to 0.
2726 * Inputs:
2727 * cmd Command name
2728 * func Function to execute the command
2729 * usage A simple usage string showing arguments
2730 * help A simple help string describing command
2731 * Returns:
2732 * zero for success, one if a duplicate command.
2733 */
2734int kdb_register(char *cmd,
2735 kdb_func_t func,
2736 char *usage,
2737 char *help,
2738 short minlen)
2739{
2740 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2741}
2742EXPORT_SYMBOL_GPL(kdb_register);
2743
2744/*
2745 * kdb_unregister - This function is used to unregister a kernel
2746 * debugger command. It is generally called when a module which
2747 * implements kdb commands is unloaded.
2748 * Inputs:
2749 * cmd Command name
2750 * Returns:
2751 * zero for success, one command not registered.
2752 */
2753int kdb_unregister(char *cmd)
2754{
2755 int i;
2756 kdbtab_t *kp;
2757
2758 /*
2759 * find the command.
2760 */
2761 for_each_kdbcmd(kp, i) {
2762 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2763 kp->cmd_name = NULL;
2764 return 0;
2765 }
2766 }
2767
2768 /* Couldn't find it. */
2769 return 1;
2770}
2771EXPORT_SYMBOL_GPL(kdb_unregister);
2772
2773/* Initialize the kdb command table. */
2774static void __init kdb_inittab(void)
2775{
2776 int i;
2777 kdbtab_t *kp;
2778
2779 for_each_kdbcmd(kp, i)
2780 kp->cmd_name = NULL;
2781
2782 kdb_register_flags("md", kdb_md, "<vaddr>",
2783 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2784 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2785 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2786 "Display Raw Memory", 0,
2787 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2788 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2789 "Display Physical Memory", 0,
2790 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2791 kdb_register_flags("mds", kdb_md, "<vaddr>",
2792 "Display Memory Symbolically", 0,
2793 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2794 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2795 "Modify Memory Contents", 0,
2796 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2797 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2798 "Continue Execution", 1,
2799 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2800 kdb_register_flags("rd", kdb_rd, "",
2801 "Display Registers", 0,
2802 KDB_ENABLE_REG_READ);
2803 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2804 "Modify Registers", 0,
2805 KDB_ENABLE_REG_WRITE);
2806 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2807 "Display exception frame", 0,
2808 KDB_ENABLE_MEM_READ);
2809 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2810 "Stack traceback", 1,
2811 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2812 kdb_register_flags("btp", kdb_bt, "<pid>",
2813 "Display stack for process <pid>", 0,
2814 KDB_ENABLE_INSPECT);
2815 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2816 "Backtrace all processes matching state flag", 0,
2817 KDB_ENABLE_INSPECT);
2818 kdb_register_flags("btc", kdb_bt, "",
2819 "Backtrace current process on each cpu", 0,
2820 KDB_ENABLE_INSPECT);
2821 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2822 "Backtrace process given its struct task address", 0,
2823 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2824 kdb_register_flags("env", kdb_env, "",
2825 "Show environment variables", 0,
2826 KDB_ENABLE_ALWAYS_SAFE);
2827 kdb_register_flags("set", kdb_set, "",
2828 "Set environment variables", 0,
2829 KDB_ENABLE_ALWAYS_SAFE);
2830 kdb_register_flags("help", kdb_help, "",
2831 "Display Help Message", 1,
2832 KDB_ENABLE_ALWAYS_SAFE);
2833 kdb_register_flags("?", kdb_help, "",
2834 "Display Help Message", 0,
2835 KDB_ENABLE_ALWAYS_SAFE);
2836 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2837 "Switch to new cpu", 0,
2838 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2839 kdb_register_flags("kgdb", kdb_kgdb, "",
2840 "Enter kgdb mode", 0, 0);
2841 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2842 "Display active task list", 0,
2843 KDB_ENABLE_INSPECT);
2844 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2845 "Switch to another task", 0,
2846 KDB_ENABLE_INSPECT);
2847 kdb_register_flags("reboot", kdb_reboot, "",
2848 "Reboot the machine immediately", 0,
2849 KDB_ENABLE_REBOOT);
2850#if defined(CONFIG_MODULES)
2851 kdb_register_flags("lsmod", kdb_lsmod, "",
2852 "List loaded kernel modules", 0,
2853 KDB_ENABLE_INSPECT);
2854#endif
2855#if defined(CONFIG_MAGIC_SYSRQ)
2856 kdb_register_flags("sr", kdb_sr, "<key>",
2857 "Magic SysRq key", 0,
2858 KDB_ENABLE_ALWAYS_SAFE);
2859#endif
2860#if defined(CONFIG_PRINTK)
2861 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2862 "Display syslog buffer", 0,
2863 KDB_ENABLE_ALWAYS_SAFE);
2864#endif
2865 if (arch_kgdb_ops.enable_nmi) {
2866 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2867 "Disable NMI entry to KDB", 0,
2868 KDB_ENABLE_ALWAYS_SAFE);
2869 }
2870 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2871 "Define a set of commands, down to endefcmd", 0,
2872 KDB_ENABLE_ALWAYS_SAFE);
2873 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2874 "Send a signal to a process", 0,
2875 KDB_ENABLE_SIGNAL);
2876 kdb_register_flags("summary", kdb_summary, "",
2877 "Summarize the system", 4,
2878 KDB_ENABLE_ALWAYS_SAFE);
2879 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2880 "Display per_cpu variables", 3,
2881 KDB_ENABLE_MEM_READ);
2882 kdb_register_flags("grephelp", kdb_grep_help, "",
2883 "Display help on | grep", 0,
2884 KDB_ENABLE_ALWAYS_SAFE);
2885}
2886
2887/* Execute any commands defined in kdb_cmds. */
2888static void __init kdb_cmd_init(void)
2889{
2890 int i, diag;
2891 for (i = 0; kdb_cmds[i]; ++i) {
2892 diag = kdb_parse(kdb_cmds[i]);
2893 if (diag)
2894 kdb_printf("kdb command %s failed, kdb diag %d\n",
2895 kdb_cmds[i], diag);
2896 }
2897 if (defcmd_in_progress) {
2898 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2899 kdb_parse("endefcmd");
2900 }
2901}
2902
2903/* Initialize kdb_printf, breakpoint tables and kdb state */
2904void __init kdb_init(int lvl)
2905{
2906 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2907 int i;
2908
2909 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2910 return;
2911 for (i = kdb_init_lvl; i < lvl; i++) {
2912 switch (i) {
2913 case KDB_NOT_INITIALIZED:
2914 kdb_inittab(); /* Initialize Command Table */
2915 kdb_initbptab(); /* Initialize Breakpoints */
2916 break;
2917 case KDB_INIT_EARLY:
2918 kdb_cmd_init(); /* Build kdb_cmds tables */
2919 break;
2920 }
2921 }
2922 kdb_init_lvl = lvl;
2923}