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1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sched/loadavg.h>
22#include <linux/sched/stat.h>
23#include <linux/sched/debug.h>
24#include <linux/sysrq.h>
25#include <linux/smp.h>
26#include <linux/utsname.h>
27#include <linux/vmalloc.h>
28#include <linux/atomic.h>
29#include <linux/moduleparam.h>
30#include <linux/mm.h>
31#include <linux/init.h>
32#include <linux/kallsyms.h>
33#include <linux/kgdb.h>
34#include <linux/kdb.h>
35#include <linux/notifier.h>
36#include <linux/interrupt.h>
37#include <linux/delay.h>
38#include <linux/nmi.h>
39#include <linux/time.h>
40#include <linux/ptrace.h>
41#include <linux/sysctl.h>
42#include <linux/cpu.h>
43#include <linux/kdebug.h>
44#include <linux/proc_fs.h>
45#include <linux/uaccess.h>
46#include <linux/slab.h>
47#include <linux/security.h>
48#include "kdb_private.h"
49
50#undef MODULE_PARAM_PREFIX
51#define MODULE_PARAM_PREFIX "kdb."
52
53static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
54module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
55
56char kdb_grep_string[KDB_GREP_STRLEN];
57int kdb_grepping_flag;
58EXPORT_SYMBOL(kdb_grepping_flag);
59int kdb_grep_leading;
60int kdb_grep_trailing;
61
62/*
63 * Kernel debugger state flags
64 */
65unsigned int kdb_flags;
66
67/*
68 * kdb_lock protects updates to kdb_initial_cpu. Used to
69 * single thread processors through the kernel debugger.
70 */
71int kdb_initial_cpu = -1; /* cpu number that owns kdb */
72int kdb_nextline = 1;
73int kdb_state; /* General KDB state */
74
75struct task_struct *kdb_current_task;
76struct pt_regs *kdb_current_regs;
77
78const char *kdb_diemsg;
79static int kdb_go_count;
80#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
81static unsigned int kdb_continue_catastrophic =
82 CONFIG_KDB_CONTINUE_CATASTROPHIC;
83#else
84static unsigned int kdb_continue_catastrophic;
85#endif
86
87/* kdb_cmds_head describes the available commands. */
88static LIST_HEAD(kdb_cmds_head);
89
90typedef struct _kdbmsg {
91 int km_diag; /* kdb diagnostic */
92 char *km_msg; /* Corresponding message text */
93} kdbmsg_t;
94
95#define KDBMSG(msgnum, text) \
96 { KDB_##msgnum, text }
97
98static kdbmsg_t kdbmsgs[] = {
99 KDBMSG(NOTFOUND, "Command Not Found"),
100 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
101 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
102 "8 is only allowed on 64 bit systems"),
103 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
104 KDBMSG(NOTENV, "Cannot find environment variable"),
105 KDBMSG(NOENVVALUE, "Environment variable should have value"),
106 KDBMSG(NOTIMP, "Command not implemented"),
107 KDBMSG(ENVFULL, "Environment full"),
108 KDBMSG(ENVBUFFULL, "Environment buffer full"),
109 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
110#ifdef CONFIG_CPU_XSCALE
111 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
112#else
113 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
114#endif
115 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
116 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
117 KDBMSG(BADMODE, "Invalid IDMODE"),
118 KDBMSG(BADINT, "Illegal numeric value"),
119 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
120 KDBMSG(BADREG, "Invalid register name"),
121 KDBMSG(BADCPUNUM, "Invalid cpu number"),
122 KDBMSG(BADLENGTH, "Invalid length field"),
123 KDBMSG(NOBP, "No Breakpoint exists"),
124 KDBMSG(BADADDR, "Invalid address"),
125 KDBMSG(NOPERM, "Permission denied"),
126};
127#undef KDBMSG
128
129static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
130
131
132/*
133 * Initial environment. This is all kept static and local to
134 * this file. We don't want to rely on the memory allocation
135 * mechanisms in the kernel, so we use a very limited allocate-only
136 * heap for new and altered environment variables. The entire
137 * environment is limited to a fixed number of entries (add more
138 * to __env[] if required) and a fixed amount of heap (add more to
139 * KDB_ENVBUFSIZE if required).
140 */
141
142static char *__env[31] = {
143#if defined(CONFIG_SMP)
144 "PROMPT=[%d]kdb> ",
145#else
146 "PROMPT=kdb> ",
147#endif
148 "MOREPROMPT=more> ",
149 "RADIX=16",
150 "MDCOUNT=8", /* lines of md output */
151 KDB_PLATFORM_ENV,
152 "DTABCOUNT=30",
153 "NOSECT=1",
154};
155
156static const int __nenv = ARRAY_SIZE(__env);
157
158struct task_struct *kdb_curr_task(int cpu)
159{
160 struct task_struct *p = curr_task(cpu);
161#ifdef _TIF_MCA_INIT
162 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
163 p = krp->p;
164#endif
165 return p;
166}
167
168/*
169 * Update the permissions flags (kdb_cmd_enabled) to match the
170 * current lockdown state.
171 *
172 * Within this function the calls to security_locked_down() are "lazy". We
173 * avoid calling them if the current value of kdb_cmd_enabled already excludes
174 * flags that might be subject to lockdown. Additionally we deliberately check
175 * the lockdown flags independently (even though read lockdown implies write
176 * lockdown) since that results in both simpler code and clearer messages to
177 * the user on first-time debugger entry.
178 *
179 * The permission masks during a read+write lockdown permits the following
180 * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE).
181 *
182 * The INSPECT commands are not blocked during lockdown because they are
183 * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes
184 * forcing them to have no arguments) and lsmod. These commands do expose
185 * some kernel state but do not allow the developer seated at the console to
186 * choose what state is reported. SIGNAL and REBOOT should not be controversial,
187 * given these are allowed for root during lockdown already.
188 */
189static void kdb_check_for_lockdown(void)
190{
191 const int write_flags = KDB_ENABLE_MEM_WRITE |
192 KDB_ENABLE_REG_WRITE |
193 KDB_ENABLE_FLOW_CTRL;
194 const int read_flags = KDB_ENABLE_MEM_READ |
195 KDB_ENABLE_REG_READ;
196
197 bool need_to_lockdown_write = false;
198 bool need_to_lockdown_read = false;
199
200 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags))
201 need_to_lockdown_write =
202 security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL);
203
204 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags))
205 need_to_lockdown_read =
206 security_locked_down(LOCKDOWN_DBG_READ_KERNEL);
207
208 /* De-compose KDB_ENABLE_ALL if required */
209 if (need_to_lockdown_write || need_to_lockdown_read)
210 if (kdb_cmd_enabled & KDB_ENABLE_ALL)
211 kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL;
212
213 if (need_to_lockdown_write)
214 kdb_cmd_enabled &= ~write_flags;
215
216 if (need_to_lockdown_read)
217 kdb_cmd_enabled &= ~read_flags;
218}
219
220/*
221 * Check whether the flags of the current command, the permissions of the kdb
222 * console and the lockdown state allow a command to be run.
223 */
224static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
225 bool no_args)
226{
227 /* permissions comes from userspace so needs massaging slightly */
228 permissions &= KDB_ENABLE_MASK;
229 permissions |= KDB_ENABLE_ALWAYS_SAFE;
230
231 /* some commands change group when launched with no arguments */
232 if (no_args)
233 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
234
235 flags |= KDB_ENABLE_ALL;
236
237 return permissions & flags;
238}
239
240/*
241 * kdbgetenv - This function will return the character string value of
242 * an environment variable.
243 * Parameters:
244 * match A character string representing an environment variable.
245 * Returns:
246 * NULL No environment variable matches 'match'
247 * char* Pointer to string value of environment variable.
248 */
249char *kdbgetenv(const char *match)
250{
251 char **ep = __env;
252 int matchlen = strlen(match);
253 int i;
254
255 for (i = 0; i < __nenv; i++) {
256 char *e = *ep++;
257
258 if (!e)
259 continue;
260
261 if ((strncmp(match, e, matchlen) == 0)
262 && ((e[matchlen] == '\0')
263 || (e[matchlen] == '='))) {
264 char *cp = strchr(e, '=');
265 return cp ? ++cp : "";
266 }
267 }
268 return NULL;
269}
270
271/*
272 * kdballocenv - This function is used to allocate bytes for
273 * environment entries.
274 * Parameters:
275 * match A character string representing a numeric value
276 * Outputs:
277 * *value the unsigned long representation of the env variable 'match'
278 * Returns:
279 * Zero on success, a kdb diagnostic on failure.
280 * Remarks:
281 * We use a static environment buffer (envbuffer) to hold the values
282 * of dynamically generated environment variables (see kdb_set). Buffer
283 * space once allocated is never free'd, so over time, the amount of space
284 * (currently 512 bytes) will be exhausted if env variables are changed
285 * frequently.
286 */
287static char *kdballocenv(size_t bytes)
288{
289#define KDB_ENVBUFSIZE 512
290 static char envbuffer[KDB_ENVBUFSIZE];
291 static int envbufsize;
292 char *ep = NULL;
293
294 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
295 ep = &envbuffer[envbufsize];
296 envbufsize += bytes;
297 }
298 return ep;
299}
300
301/*
302 * kdbgetulenv - This function will return the value of an unsigned
303 * long-valued environment variable.
304 * Parameters:
305 * match A character string representing a numeric value
306 * Outputs:
307 * *value the unsigned long representation of the env variable 'match'
308 * Returns:
309 * Zero on success, a kdb diagnostic on failure.
310 */
311static int kdbgetulenv(const char *match, unsigned long *value)
312{
313 char *ep;
314
315 ep = kdbgetenv(match);
316 if (!ep)
317 return KDB_NOTENV;
318 if (strlen(ep) == 0)
319 return KDB_NOENVVALUE;
320
321 *value = simple_strtoul(ep, NULL, 0);
322
323 return 0;
324}
325
326/*
327 * kdbgetintenv - This function will return the value of an
328 * integer-valued environment variable.
329 * Parameters:
330 * match A character string representing an integer-valued env variable
331 * Outputs:
332 * *value the integer representation of the environment variable 'match'
333 * Returns:
334 * Zero on success, a kdb diagnostic on failure.
335 */
336int kdbgetintenv(const char *match, int *value)
337{
338 unsigned long val;
339 int diag;
340
341 diag = kdbgetulenv(match, &val);
342 if (!diag)
343 *value = (int) val;
344 return diag;
345}
346
347/*
348 * kdb_setenv() - Alter an existing environment variable or create a new one.
349 * @var: Name of the variable
350 * @val: Value of the variable
351 *
352 * Return: Zero on success, a kdb diagnostic on failure.
353 */
354static int kdb_setenv(const char *var, const char *val)
355{
356 int i;
357 char *ep;
358 size_t varlen, vallen;
359
360 varlen = strlen(var);
361 vallen = strlen(val);
362 ep = kdballocenv(varlen + vallen + 2);
363 if (ep == (char *)0)
364 return KDB_ENVBUFFULL;
365
366 sprintf(ep, "%s=%s", var, val);
367
368 for (i = 0; i < __nenv; i++) {
369 if (__env[i]
370 && ((strncmp(__env[i], var, varlen) == 0)
371 && ((__env[i][varlen] == '\0')
372 || (__env[i][varlen] == '=')))) {
373 __env[i] = ep;
374 return 0;
375 }
376 }
377
378 /*
379 * Wasn't existing variable. Fit into slot.
380 */
381 for (i = 0; i < __nenv-1; i++) {
382 if (__env[i] == (char *)0) {
383 __env[i] = ep;
384 return 0;
385 }
386 }
387
388 return KDB_ENVFULL;
389}
390
391/*
392 * kdb_printenv() - Display the current environment variables.
393 */
394static void kdb_printenv(void)
395{
396 int i;
397
398 for (i = 0; i < __nenv; i++) {
399 if (__env[i])
400 kdb_printf("%s\n", __env[i]);
401 }
402}
403
404/*
405 * kdbgetularg - This function will convert a numeric string into an
406 * unsigned long value.
407 * Parameters:
408 * arg A character string representing a numeric value
409 * Outputs:
410 * *value the unsigned long representation of arg.
411 * Returns:
412 * Zero on success, a kdb diagnostic on failure.
413 */
414int kdbgetularg(const char *arg, unsigned long *value)
415{
416 char *endp;
417 unsigned long val;
418
419 val = simple_strtoul(arg, &endp, 0);
420
421 if (endp == arg) {
422 /*
423 * Also try base 16, for us folks too lazy to type the
424 * leading 0x...
425 */
426 val = simple_strtoul(arg, &endp, 16);
427 if (endp == arg)
428 return KDB_BADINT;
429 }
430
431 *value = val;
432
433 return 0;
434}
435
436int kdbgetu64arg(const char *arg, u64 *value)
437{
438 char *endp;
439 u64 val;
440
441 val = simple_strtoull(arg, &endp, 0);
442
443 if (endp == arg) {
444
445 val = simple_strtoull(arg, &endp, 16);
446 if (endp == arg)
447 return KDB_BADINT;
448 }
449
450 *value = val;
451
452 return 0;
453}
454
455/*
456 * kdb_set - This function implements the 'set' command. Alter an
457 * existing environment variable or create a new one.
458 */
459int kdb_set(int argc, const char **argv)
460{
461 /*
462 * we can be invoked two ways:
463 * set var=value argv[1]="var", argv[2]="value"
464 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
465 * - if the latter, shift 'em down.
466 */
467 if (argc == 3) {
468 argv[2] = argv[3];
469 argc--;
470 }
471
472 if (argc != 2)
473 return KDB_ARGCOUNT;
474
475 /*
476 * Censor sensitive variables
477 */
478 if (strcmp(argv[1], "PROMPT") == 0 &&
479 !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
480 return KDB_NOPERM;
481
482 /*
483 * Check for internal variables
484 */
485 if (strcmp(argv[1], "KDBDEBUG") == 0) {
486 unsigned int debugflags;
487 char *cp;
488
489 debugflags = simple_strtoul(argv[2], &cp, 0);
490 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
491 kdb_printf("kdb: illegal debug flags '%s'\n",
492 argv[2]);
493 return 0;
494 }
495 kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK))
496 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
497
498 return 0;
499 }
500
501 /*
502 * Tokenizer squashed the '=' sign. argv[1] is variable
503 * name, argv[2] = value.
504 */
505 return kdb_setenv(argv[1], argv[2]);
506}
507
508static int kdb_check_regs(void)
509{
510 if (!kdb_current_regs) {
511 kdb_printf("No current kdb registers."
512 " You may need to select another task\n");
513 return KDB_BADREG;
514 }
515 return 0;
516}
517
518/*
519 * kdbgetaddrarg - This function is responsible for parsing an
520 * address-expression and returning the value of the expression,
521 * symbol name, and offset to the caller.
522 *
523 * The argument may consist of a numeric value (decimal or
524 * hexadecimal), a symbol name, a register name (preceded by the
525 * percent sign), an environment variable with a numeric value
526 * (preceded by a dollar sign) or a simple arithmetic expression
527 * consisting of a symbol name, +/-, and a numeric constant value
528 * (offset).
529 * Parameters:
530 * argc - count of arguments in argv
531 * argv - argument vector
532 * *nextarg - index to next unparsed argument in argv[]
533 * regs - Register state at time of KDB entry
534 * Outputs:
535 * *value - receives the value of the address-expression
536 * *offset - receives the offset specified, if any
537 * *name - receives the symbol name, if any
538 * *nextarg - index to next unparsed argument in argv[]
539 * Returns:
540 * zero is returned on success, a kdb diagnostic code is
541 * returned on error.
542 */
543int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
544 unsigned long *value, long *offset,
545 char **name)
546{
547 unsigned long addr;
548 unsigned long off = 0;
549 int positive;
550 int diag;
551 int found = 0;
552 char *symname;
553 char symbol = '\0';
554 char *cp;
555 kdb_symtab_t symtab;
556
557 /*
558 * If the enable flags prohibit both arbitrary memory access
559 * and flow control then there are no reasonable grounds to
560 * provide symbol lookup.
561 */
562 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
563 kdb_cmd_enabled, false))
564 return KDB_NOPERM;
565
566 /*
567 * Process arguments which follow the following syntax:
568 *
569 * symbol | numeric-address [+/- numeric-offset]
570 * %register
571 * $environment-variable
572 */
573
574 if (*nextarg > argc)
575 return KDB_ARGCOUNT;
576
577 symname = (char *)argv[*nextarg];
578
579 /*
580 * If there is no whitespace between the symbol
581 * or address and the '+' or '-' symbols, we
582 * remember the character and replace it with a
583 * null so the symbol/value can be properly parsed
584 */
585 cp = strpbrk(symname, "+-");
586 if (cp != NULL) {
587 symbol = *cp;
588 *cp++ = '\0';
589 }
590
591 if (symname[0] == '$') {
592 diag = kdbgetulenv(&symname[1], &addr);
593 if (diag)
594 return diag;
595 } else if (symname[0] == '%') {
596 diag = kdb_check_regs();
597 if (diag)
598 return diag;
599 /* Implement register values with % at a later time as it is
600 * arch optional.
601 */
602 return KDB_NOTIMP;
603 } else {
604 found = kdbgetsymval(symname, &symtab);
605 if (found) {
606 addr = symtab.sym_start;
607 } else {
608 diag = kdbgetularg(argv[*nextarg], &addr);
609 if (diag)
610 return diag;
611 }
612 }
613
614 if (!found)
615 found = kdbnearsym(addr, &symtab);
616
617 (*nextarg)++;
618
619 if (name)
620 *name = symname;
621 if (value)
622 *value = addr;
623 if (offset && name && *name)
624 *offset = addr - symtab.sym_start;
625
626 if ((*nextarg > argc)
627 && (symbol == '\0'))
628 return 0;
629
630 /*
631 * check for +/- and offset
632 */
633
634 if (symbol == '\0') {
635 if ((argv[*nextarg][0] != '+')
636 && (argv[*nextarg][0] != '-')) {
637 /*
638 * Not our argument. Return.
639 */
640 return 0;
641 } else {
642 positive = (argv[*nextarg][0] == '+');
643 (*nextarg)++;
644 }
645 } else
646 positive = (symbol == '+');
647
648 /*
649 * Now there must be an offset!
650 */
651 if ((*nextarg > argc)
652 && (symbol == '\0')) {
653 return KDB_INVADDRFMT;
654 }
655
656 if (!symbol) {
657 cp = (char *)argv[*nextarg];
658 (*nextarg)++;
659 }
660
661 diag = kdbgetularg(cp, &off);
662 if (diag)
663 return diag;
664
665 if (!positive)
666 off = -off;
667
668 if (offset)
669 *offset += off;
670
671 if (value)
672 *value += off;
673
674 return 0;
675}
676
677static void kdb_cmderror(int diag)
678{
679 int i;
680
681 if (diag >= 0) {
682 kdb_printf("no error detected (diagnostic is %d)\n", diag);
683 return;
684 }
685
686 for (i = 0; i < __nkdb_err; i++) {
687 if (kdbmsgs[i].km_diag == diag) {
688 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
689 return;
690 }
691 }
692
693 kdb_printf("Unknown diag %d\n", -diag);
694}
695
696/*
697 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
698 * command which defines one command as a set of other commands,
699 * terminated by endefcmd. kdb_defcmd processes the initial
700 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
701 * the following commands until 'endefcmd'.
702 * Inputs:
703 * argc argument count
704 * argv argument vector
705 * Returns:
706 * zero for success, a kdb diagnostic if error
707 */
708struct kdb_macro {
709 kdbtab_t cmd; /* Macro command */
710 struct list_head statements; /* Associated statement list */
711};
712
713struct kdb_macro_statement {
714 char *statement; /* Statement text */
715 struct list_head list_node; /* Statement list node */
716};
717
718static struct kdb_macro *kdb_macro;
719static bool defcmd_in_progress;
720
721/* Forward references */
722static int kdb_exec_defcmd(int argc, const char **argv);
723
724static int kdb_defcmd2(const char *cmdstr, const char *argv0)
725{
726 struct kdb_macro_statement *kms;
727
728 if (!kdb_macro)
729 return KDB_NOTIMP;
730
731 if (strcmp(argv0, "endefcmd") == 0) {
732 defcmd_in_progress = false;
733 if (!list_empty(&kdb_macro->statements))
734 kdb_register(&kdb_macro->cmd);
735 return 0;
736 }
737
738 kms = kmalloc(sizeof(*kms), GFP_KDB);
739 if (!kms) {
740 kdb_printf("Could not allocate new kdb macro command: %s\n",
741 cmdstr);
742 return KDB_NOTIMP;
743 }
744
745 kms->statement = kdb_strdup(cmdstr, GFP_KDB);
746 list_add_tail(&kms->list_node, &kdb_macro->statements);
747
748 return 0;
749}
750
751static int kdb_defcmd(int argc, const char **argv)
752{
753 kdbtab_t *mp;
754
755 if (defcmd_in_progress) {
756 kdb_printf("kdb: nested defcmd detected, assuming missing "
757 "endefcmd\n");
758 kdb_defcmd2("endefcmd", "endefcmd");
759 }
760 if (argc == 0) {
761 kdbtab_t *kp;
762 struct kdb_macro *kmp;
763 struct kdb_macro_statement *kms;
764
765 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
766 if (kp->func == kdb_exec_defcmd) {
767 kdb_printf("defcmd %s \"%s\" \"%s\"\n",
768 kp->name, kp->usage, kp->help);
769 kmp = container_of(kp, struct kdb_macro, cmd);
770 list_for_each_entry(kms, &kmp->statements,
771 list_node)
772 kdb_printf("%s", kms->statement);
773 kdb_printf("endefcmd\n");
774 }
775 }
776 return 0;
777 }
778 if (argc != 3)
779 return KDB_ARGCOUNT;
780 if (in_dbg_master()) {
781 kdb_printf("Command only available during kdb_init()\n");
782 return KDB_NOTIMP;
783 }
784 kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
785 if (!kdb_macro)
786 goto fail_defcmd;
787
788 mp = &kdb_macro->cmd;
789 mp->func = kdb_exec_defcmd;
790 mp->minlen = 0;
791 mp->flags = KDB_ENABLE_ALWAYS_SAFE;
792 mp->name = kdb_strdup(argv[1], GFP_KDB);
793 if (!mp->name)
794 goto fail_name;
795 mp->usage = kdb_strdup(argv[2], GFP_KDB);
796 if (!mp->usage)
797 goto fail_usage;
798 mp->help = kdb_strdup(argv[3], GFP_KDB);
799 if (!mp->help)
800 goto fail_help;
801 if (mp->usage[0] == '"') {
802 strcpy(mp->usage, argv[2]+1);
803 mp->usage[strlen(mp->usage)-1] = '\0';
804 }
805 if (mp->help[0] == '"') {
806 strcpy(mp->help, argv[3]+1);
807 mp->help[strlen(mp->help)-1] = '\0';
808 }
809
810 INIT_LIST_HEAD(&kdb_macro->statements);
811 defcmd_in_progress = true;
812 return 0;
813fail_help:
814 kfree(mp->usage);
815fail_usage:
816 kfree(mp->name);
817fail_name:
818 kfree(kdb_macro);
819fail_defcmd:
820 kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
821 return KDB_NOTIMP;
822}
823
824/*
825 * kdb_exec_defcmd - Execute the set of commands associated with this
826 * defcmd name.
827 * Inputs:
828 * argc argument count
829 * argv argument vector
830 * Returns:
831 * zero for success, a kdb diagnostic if error
832 */
833static int kdb_exec_defcmd(int argc, const char **argv)
834{
835 int ret;
836 kdbtab_t *kp;
837 struct kdb_macro *kmp;
838 struct kdb_macro_statement *kms;
839
840 if (argc != 0)
841 return KDB_ARGCOUNT;
842
843 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
844 if (strcmp(kp->name, argv[0]) == 0)
845 break;
846 }
847 if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
848 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
849 argv[0]);
850 return KDB_NOTIMP;
851 }
852 kmp = container_of(kp, struct kdb_macro, cmd);
853 list_for_each_entry(kms, &kmp->statements, list_node) {
854 /*
855 * Recursive use of kdb_parse, do not use argv after this point.
856 */
857 argv = NULL;
858 kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
859 ret = kdb_parse(kms->statement);
860 if (ret)
861 return ret;
862 }
863 return 0;
864}
865
866/* Command history */
867#define KDB_CMD_HISTORY_COUNT 32
868#define CMD_BUFLEN 200 /* kdb_printf: max printline
869 * size == 256 */
870static unsigned int cmd_head, cmd_tail;
871static unsigned int cmdptr;
872static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
873static char cmd_cur[CMD_BUFLEN];
874
875/*
876 * The "str" argument may point to something like | grep xyz
877 */
878static void parse_grep(const char *str)
879{
880 int len;
881 char *cp = (char *)str, *cp2;
882
883 /* sanity check: we should have been called with the \ first */
884 if (*cp != '|')
885 return;
886 cp++;
887 while (isspace(*cp))
888 cp++;
889 if (!str_has_prefix(cp, "grep ")) {
890 kdb_printf("invalid 'pipe', see grephelp\n");
891 return;
892 }
893 cp += 5;
894 while (isspace(*cp))
895 cp++;
896 cp2 = strchr(cp, '\n');
897 if (cp2)
898 *cp2 = '\0'; /* remove the trailing newline */
899 len = strlen(cp);
900 if (len == 0) {
901 kdb_printf("invalid 'pipe', see grephelp\n");
902 return;
903 }
904 /* now cp points to a nonzero length search string */
905 if (*cp == '"') {
906 /* allow it be "x y z" by removing the "'s - there must
907 be two of them */
908 cp++;
909 cp2 = strchr(cp, '"');
910 if (!cp2) {
911 kdb_printf("invalid quoted string, see grephelp\n");
912 return;
913 }
914 *cp2 = '\0'; /* end the string where the 2nd " was */
915 }
916 kdb_grep_leading = 0;
917 if (*cp == '^') {
918 kdb_grep_leading = 1;
919 cp++;
920 }
921 len = strlen(cp);
922 kdb_grep_trailing = 0;
923 if (*(cp+len-1) == '$') {
924 kdb_grep_trailing = 1;
925 *(cp+len-1) = '\0';
926 }
927 len = strlen(cp);
928 if (!len)
929 return;
930 if (len >= KDB_GREP_STRLEN) {
931 kdb_printf("search string too long\n");
932 return;
933 }
934 strcpy(kdb_grep_string, cp);
935 kdb_grepping_flag++;
936 return;
937}
938
939/*
940 * kdb_parse - Parse the command line, search the command table for a
941 * matching command and invoke the command function. This
942 * function may be called recursively, if it is, the second call
943 * will overwrite argv and cbuf. It is the caller's
944 * responsibility to save their argv if they recursively call
945 * kdb_parse().
946 * Parameters:
947 * cmdstr The input command line to be parsed.
948 * regs The registers at the time kdb was entered.
949 * Returns:
950 * Zero for success, a kdb diagnostic if failure.
951 * Remarks:
952 * Limited to 20 tokens.
953 *
954 * Real rudimentary tokenization. Basically only whitespace
955 * is considered a token delimiter (but special consideration
956 * is taken of the '=' sign as used by the 'set' command).
957 *
958 * The algorithm used to tokenize the input string relies on
959 * there being at least one whitespace (or otherwise useless)
960 * character between tokens as the character immediately following
961 * the token is altered in-place to a null-byte to terminate the
962 * token string.
963 */
964
965#define MAXARGC 20
966
967int kdb_parse(const char *cmdstr)
968{
969 static char *argv[MAXARGC];
970 static int argc;
971 static char cbuf[CMD_BUFLEN+2];
972 char *cp;
973 char *cpp, quoted;
974 kdbtab_t *tp;
975 int escaped, ignore_errors = 0, check_grep = 0;
976
977 /*
978 * First tokenize the command string.
979 */
980 cp = (char *)cmdstr;
981
982 if (KDB_FLAG(CMD_INTERRUPT)) {
983 /* Previous command was interrupted, newline must not
984 * repeat the command */
985 KDB_FLAG_CLEAR(CMD_INTERRUPT);
986 KDB_STATE_SET(PAGER);
987 argc = 0; /* no repeat */
988 }
989
990 if (*cp != '\n' && *cp != '\0') {
991 argc = 0;
992 cpp = cbuf;
993 while (*cp) {
994 /* skip whitespace */
995 while (isspace(*cp))
996 cp++;
997 if ((*cp == '\0') || (*cp == '\n') ||
998 (*cp == '#' && !defcmd_in_progress))
999 break;
1000 /* special case: check for | grep pattern */
1001 if (*cp == '|') {
1002 check_grep++;
1003 break;
1004 }
1005 if (cpp >= cbuf + CMD_BUFLEN) {
1006 kdb_printf("kdb_parse: command buffer "
1007 "overflow, command ignored\n%s\n",
1008 cmdstr);
1009 return KDB_NOTFOUND;
1010 }
1011 if (argc >= MAXARGC - 1) {
1012 kdb_printf("kdb_parse: too many arguments, "
1013 "command ignored\n%s\n", cmdstr);
1014 return KDB_NOTFOUND;
1015 }
1016 argv[argc++] = cpp;
1017 escaped = 0;
1018 quoted = '\0';
1019 /* Copy to next unquoted and unescaped
1020 * whitespace or '=' */
1021 while (*cp && *cp != '\n' &&
1022 (escaped || quoted || !isspace(*cp))) {
1023 if (cpp >= cbuf + CMD_BUFLEN)
1024 break;
1025 if (escaped) {
1026 escaped = 0;
1027 *cpp++ = *cp++;
1028 continue;
1029 }
1030 if (*cp == '\\') {
1031 escaped = 1;
1032 ++cp;
1033 continue;
1034 }
1035 if (*cp == quoted)
1036 quoted = '\0';
1037 else if (*cp == '\'' || *cp == '"')
1038 quoted = *cp;
1039 *cpp = *cp++;
1040 if (*cpp == '=' && !quoted)
1041 break;
1042 ++cpp;
1043 }
1044 *cpp++ = '\0'; /* Squash a ws or '=' character */
1045 }
1046 }
1047 if (!argc)
1048 return 0;
1049 if (check_grep)
1050 parse_grep(cp);
1051 if (defcmd_in_progress) {
1052 int result = kdb_defcmd2(cmdstr, argv[0]);
1053 if (!defcmd_in_progress) {
1054 argc = 0; /* avoid repeat on endefcmd */
1055 *(argv[0]) = '\0';
1056 }
1057 return result;
1058 }
1059 if (argv[0][0] == '-' && argv[0][1] &&
1060 (argv[0][1] < '0' || argv[0][1] > '9')) {
1061 ignore_errors = 1;
1062 ++argv[0];
1063 }
1064
1065 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1066 /*
1067 * If this command is allowed to be abbreviated,
1068 * check to see if this is it.
1069 */
1070 if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
1071 (strncmp(argv[0], tp->name, tp->minlen) == 0))
1072 break;
1073
1074 if (strcmp(argv[0], tp->name) == 0)
1075 break;
1076 }
1077
1078 /*
1079 * If we don't find a command by this name, see if the first
1080 * few characters of this match any of the known commands.
1081 * e.g., md1c20 should match md.
1082 */
1083 if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1084 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1085 if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
1086 break;
1087 }
1088 }
1089
1090 if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1091 int result;
1092
1093 if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
1094 return KDB_NOPERM;
1095
1096 KDB_STATE_SET(CMD);
1097 result = (*tp->func)(argc-1, (const char **)argv);
1098 if (result && ignore_errors && result > KDB_CMD_GO)
1099 result = 0;
1100 KDB_STATE_CLEAR(CMD);
1101
1102 if (tp->flags & KDB_REPEAT_WITH_ARGS)
1103 return result;
1104
1105 argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1106 if (argv[argc])
1107 *(argv[argc]) = '\0';
1108 return result;
1109 }
1110
1111 /*
1112 * If the input with which we were presented does not
1113 * map to an existing command, attempt to parse it as an
1114 * address argument and display the result. Useful for
1115 * obtaining the address of a variable, or the nearest symbol
1116 * to an address contained in a register.
1117 */
1118 {
1119 unsigned long value;
1120 char *name = NULL;
1121 long offset;
1122 int nextarg = 0;
1123
1124 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1125 &value, &offset, &name)) {
1126 return KDB_NOTFOUND;
1127 }
1128
1129 kdb_printf("%s = ", argv[0]);
1130 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1131 kdb_printf("\n");
1132 return 0;
1133 }
1134}
1135
1136
1137static int handle_ctrl_cmd(char *cmd)
1138{
1139#define CTRL_P 16
1140#define CTRL_N 14
1141
1142 /* initial situation */
1143 if (cmd_head == cmd_tail)
1144 return 0;
1145 switch (*cmd) {
1146 case CTRL_P:
1147 if (cmdptr != cmd_tail)
1148 cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
1149 KDB_CMD_HISTORY_COUNT;
1150 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1151 return 1;
1152 case CTRL_N:
1153 if (cmdptr != cmd_head)
1154 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1155 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1156 return 1;
1157 }
1158 return 0;
1159}
1160
1161/*
1162 * kdb_reboot - This function implements the 'reboot' command. Reboot
1163 * the system immediately, or loop for ever on failure.
1164 */
1165static int kdb_reboot(int argc, const char **argv)
1166{
1167 emergency_restart();
1168 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1169 while (1)
1170 cpu_relax();
1171 /* NOTREACHED */
1172 return 0;
1173}
1174
1175static void kdb_dumpregs(struct pt_regs *regs)
1176{
1177 int old_lvl = console_loglevel;
1178 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1179 kdb_trap_printk++;
1180 show_regs(regs);
1181 kdb_trap_printk--;
1182 kdb_printf("\n");
1183 console_loglevel = old_lvl;
1184}
1185
1186static void kdb_set_current_task(struct task_struct *p)
1187{
1188 kdb_current_task = p;
1189
1190 if (kdb_task_has_cpu(p)) {
1191 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1192 return;
1193 }
1194 kdb_current_regs = NULL;
1195}
1196
1197static void drop_newline(char *buf)
1198{
1199 size_t len = strlen(buf);
1200
1201 if (len == 0)
1202 return;
1203 if (*(buf + len - 1) == '\n')
1204 *(buf + len - 1) = '\0';
1205}
1206
1207/*
1208 * kdb_local - The main code for kdb. This routine is invoked on a
1209 * specific processor, it is not global. The main kdb() routine
1210 * ensures that only one processor at a time is in this routine.
1211 * This code is called with the real reason code on the first
1212 * entry to a kdb session, thereafter it is called with reason
1213 * SWITCH, even if the user goes back to the original cpu.
1214 * Inputs:
1215 * reason The reason KDB was invoked
1216 * error The hardware-defined error code
1217 * regs The exception frame at time of fault/breakpoint.
1218 * db_result Result code from the break or debug point.
1219 * Returns:
1220 * 0 KDB was invoked for an event which it wasn't responsible
1221 * 1 KDB handled the event for which it was invoked.
1222 * KDB_CMD_GO User typed 'go'.
1223 * KDB_CMD_CPU User switched to another cpu.
1224 * KDB_CMD_SS Single step.
1225 */
1226static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1227 kdb_dbtrap_t db_result)
1228{
1229 char *cmdbuf;
1230 int diag;
1231 struct task_struct *kdb_current =
1232 kdb_curr_task(raw_smp_processor_id());
1233
1234 KDB_DEBUG_STATE("kdb_local 1", reason);
1235
1236 kdb_check_for_lockdown();
1237
1238 kdb_go_count = 0;
1239 if (reason == KDB_REASON_DEBUG) {
1240 /* special case below */
1241 } else {
1242 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1243 kdb_current, kdb_current ? kdb_current->pid : 0);
1244#if defined(CONFIG_SMP)
1245 kdb_printf("on processor %d ", raw_smp_processor_id());
1246#endif
1247 }
1248
1249 switch (reason) {
1250 case KDB_REASON_DEBUG:
1251 {
1252 /*
1253 * If re-entering kdb after a single step
1254 * command, don't print the message.
1255 */
1256 switch (db_result) {
1257 case KDB_DB_BPT:
1258 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1259 kdb_current, kdb_current->pid);
1260#if defined(CONFIG_SMP)
1261 kdb_printf("on processor %d ", raw_smp_processor_id());
1262#endif
1263 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1264 instruction_pointer(regs));
1265 break;
1266 case KDB_DB_SS:
1267 break;
1268 case KDB_DB_SSBPT:
1269 KDB_DEBUG_STATE("kdb_local 4", reason);
1270 return 1; /* kdba_db_trap did the work */
1271 default:
1272 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1273 db_result);
1274 break;
1275 }
1276
1277 }
1278 break;
1279 case KDB_REASON_ENTER:
1280 if (KDB_STATE(KEYBOARD))
1281 kdb_printf("due to Keyboard Entry\n");
1282 else
1283 kdb_printf("due to KDB_ENTER()\n");
1284 break;
1285 case KDB_REASON_KEYBOARD:
1286 KDB_STATE_SET(KEYBOARD);
1287 kdb_printf("due to Keyboard Entry\n");
1288 break;
1289 case KDB_REASON_ENTER_SLAVE:
1290 /* drop through, slaves only get released via cpu switch */
1291 case KDB_REASON_SWITCH:
1292 kdb_printf("due to cpu switch\n");
1293 break;
1294 case KDB_REASON_OOPS:
1295 kdb_printf("Oops: %s\n", kdb_diemsg);
1296 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1297 instruction_pointer(regs));
1298 kdb_dumpregs(regs);
1299 break;
1300 case KDB_REASON_SYSTEM_NMI:
1301 kdb_printf("due to System NonMaskable Interrupt\n");
1302 break;
1303 case KDB_REASON_NMI:
1304 kdb_printf("due to NonMaskable Interrupt @ "
1305 kdb_machreg_fmt "\n",
1306 instruction_pointer(regs));
1307 break;
1308 case KDB_REASON_SSTEP:
1309 case KDB_REASON_BREAK:
1310 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1311 reason == KDB_REASON_BREAK ?
1312 "Breakpoint" : "SS trap", instruction_pointer(regs));
1313 /*
1314 * Determine if this breakpoint is one that we
1315 * are interested in.
1316 */
1317 if (db_result != KDB_DB_BPT) {
1318 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1319 db_result);
1320 KDB_DEBUG_STATE("kdb_local 6", reason);
1321 return 0; /* Not for us, dismiss it */
1322 }
1323 break;
1324 case KDB_REASON_RECURSE:
1325 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1326 instruction_pointer(regs));
1327 break;
1328 default:
1329 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1330 KDB_DEBUG_STATE("kdb_local 8", reason);
1331 return 0; /* Not for us, dismiss it */
1332 }
1333
1334 while (1) {
1335 /*
1336 * Initialize pager context.
1337 */
1338 kdb_nextline = 1;
1339 KDB_STATE_CLEAR(SUPPRESS);
1340 kdb_grepping_flag = 0;
1341 /* ensure the old search does not leak into '/' commands */
1342 kdb_grep_string[0] = '\0';
1343
1344 cmdbuf = cmd_cur;
1345 *cmdbuf = '\0';
1346 *(cmd_hist[cmd_head]) = '\0';
1347
1348do_full_getstr:
1349 /* PROMPT can only be set if we have MEM_READ permission. */
1350 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1351 raw_smp_processor_id());
1352 if (defcmd_in_progress)
1353 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1354
1355 /*
1356 * Fetch command from keyboard
1357 */
1358 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1359 if (*cmdbuf != '\n') {
1360 if (*cmdbuf < 32) {
1361 if (cmdptr == cmd_head) {
1362 strscpy(cmd_hist[cmd_head], cmd_cur,
1363 CMD_BUFLEN);
1364 *(cmd_hist[cmd_head] +
1365 strlen(cmd_hist[cmd_head])-1) = '\0';
1366 }
1367 if (!handle_ctrl_cmd(cmdbuf))
1368 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1369 cmdbuf = cmd_cur;
1370 goto do_full_getstr;
1371 } else {
1372 strscpy(cmd_hist[cmd_head], cmd_cur,
1373 CMD_BUFLEN);
1374 }
1375
1376 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1377 if (cmd_head == cmd_tail)
1378 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1379 }
1380
1381 cmdptr = cmd_head;
1382 diag = kdb_parse(cmdbuf);
1383 if (diag == KDB_NOTFOUND) {
1384 drop_newline(cmdbuf);
1385 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1386 diag = 0;
1387 }
1388 if (diag == KDB_CMD_GO
1389 || diag == KDB_CMD_CPU
1390 || diag == KDB_CMD_SS
1391 || diag == KDB_CMD_KGDB)
1392 break;
1393
1394 if (diag)
1395 kdb_cmderror(diag);
1396 }
1397 KDB_DEBUG_STATE("kdb_local 9", diag);
1398 return diag;
1399}
1400
1401
1402/*
1403 * kdb_print_state - Print the state data for the current processor
1404 * for debugging.
1405 * Inputs:
1406 * text Identifies the debug point
1407 * value Any integer value to be printed, e.g. reason code.
1408 */
1409void kdb_print_state(const char *text, int value)
1410{
1411 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1412 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1413 kdb_state);
1414}
1415
1416/*
1417 * kdb_main_loop - After initial setup and assignment of the
1418 * controlling cpu, all cpus are in this loop. One cpu is in
1419 * control and will issue the kdb prompt, the others will spin
1420 * until 'go' or cpu switch.
1421 *
1422 * To get a consistent view of the kernel stacks for all
1423 * processes, this routine is invoked from the main kdb code via
1424 * an architecture specific routine. kdba_main_loop is
1425 * responsible for making the kernel stacks consistent for all
1426 * processes, there should be no difference between a blocked
1427 * process and a running process as far as kdb is concerned.
1428 * Inputs:
1429 * reason The reason KDB was invoked
1430 * error The hardware-defined error code
1431 * reason2 kdb's current reason code.
1432 * Initially error but can change
1433 * according to kdb state.
1434 * db_result Result code from break or debug point.
1435 * regs The exception frame at time of fault/breakpoint.
1436 * should always be valid.
1437 * Returns:
1438 * 0 KDB was invoked for an event which it wasn't responsible
1439 * 1 KDB handled the event for which it was invoked.
1440 */
1441int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1442 kdb_dbtrap_t db_result, struct pt_regs *regs)
1443{
1444 int result = 1;
1445 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1446 while (1) {
1447 /*
1448 * All processors except the one that is in control
1449 * will spin here.
1450 */
1451 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1452 while (KDB_STATE(HOLD_CPU)) {
1453 /* state KDB is turned off by kdb_cpu to see if the
1454 * other cpus are still live, each cpu in this loop
1455 * turns it back on.
1456 */
1457 if (!KDB_STATE(KDB))
1458 KDB_STATE_SET(KDB);
1459 }
1460
1461 KDB_STATE_CLEAR(SUPPRESS);
1462 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1463 if (KDB_STATE(LEAVING))
1464 break; /* Another cpu said 'go' */
1465 /* Still using kdb, this processor is in control */
1466 result = kdb_local(reason2, error, regs, db_result);
1467 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1468
1469 if (result == KDB_CMD_CPU)
1470 break;
1471
1472 if (result == KDB_CMD_SS) {
1473 KDB_STATE_SET(DOING_SS);
1474 break;
1475 }
1476
1477 if (result == KDB_CMD_KGDB) {
1478 if (!KDB_STATE(DOING_KGDB))
1479 kdb_printf("Entering please attach debugger "
1480 "or use $D#44+ or $3#33\n");
1481 break;
1482 }
1483 if (result && result != 1 && result != KDB_CMD_GO)
1484 kdb_printf("\nUnexpected kdb_local return code %d\n",
1485 result);
1486 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1487 break;
1488 }
1489 if (KDB_STATE(DOING_SS))
1490 KDB_STATE_CLEAR(SSBPT);
1491
1492 /* Clean up any keyboard devices before leaving */
1493 kdb_kbd_cleanup_state();
1494
1495 return result;
1496}
1497
1498/*
1499 * kdb_mdr - This function implements the guts of the 'mdr', memory
1500 * read command.
1501 * mdr <addr arg>,<byte count>
1502 * Inputs:
1503 * addr Start address
1504 * count Number of bytes
1505 * Returns:
1506 * Always 0. Any errors are detected and printed by kdb_getarea.
1507 */
1508static int kdb_mdr(unsigned long addr, unsigned int count)
1509{
1510 unsigned char c;
1511 while (count--) {
1512 if (kdb_getarea(c, addr))
1513 return 0;
1514 kdb_printf("%02x", c);
1515 addr++;
1516 }
1517 kdb_printf("\n");
1518 return 0;
1519}
1520
1521/*
1522 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1523 * 'md8' 'mdr' and 'mds' commands.
1524 *
1525 * md|mds [<addr arg> [<line count> [<radix>]]]
1526 * mdWcN [<addr arg> [<line count> [<radix>]]]
1527 * where W = is the width (1, 2, 4 or 8) and N is the count.
1528 * for eg., md1c20 reads 20 bytes, 1 at a time.
1529 * mdr <addr arg>,<byte count>
1530 */
1531static void kdb_md_line(const char *fmtstr, unsigned long addr,
1532 int symbolic, int nosect, int bytesperword,
1533 int num, int repeat, int phys)
1534{
1535 /* print just one line of data */
1536 kdb_symtab_t symtab;
1537 char cbuf[32];
1538 char *c = cbuf;
1539 int i;
1540 int j;
1541 unsigned long word;
1542
1543 memset(cbuf, '\0', sizeof(cbuf));
1544 if (phys)
1545 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1546 else
1547 kdb_printf(kdb_machreg_fmt0 " ", addr);
1548
1549 for (i = 0; i < num && repeat--; i++) {
1550 if (phys) {
1551 if (kdb_getphysword(&word, addr, bytesperword))
1552 break;
1553 } else if (kdb_getword(&word, addr, bytesperword))
1554 break;
1555 kdb_printf(fmtstr, word);
1556 if (symbolic)
1557 kdbnearsym(word, &symtab);
1558 else
1559 memset(&symtab, 0, sizeof(symtab));
1560 if (symtab.sym_name) {
1561 kdb_symbol_print(word, &symtab, 0);
1562 if (!nosect) {
1563 kdb_printf("\n");
1564 kdb_printf(" %s %s "
1565 kdb_machreg_fmt " "
1566 kdb_machreg_fmt " "
1567 kdb_machreg_fmt, symtab.mod_name,
1568 symtab.sec_name, symtab.sec_start,
1569 symtab.sym_start, symtab.sym_end);
1570 }
1571 addr += bytesperword;
1572 } else {
1573 union {
1574 u64 word;
1575 unsigned char c[8];
1576 } wc;
1577 unsigned char *cp;
1578#ifdef __BIG_ENDIAN
1579 cp = wc.c + 8 - bytesperword;
1580#else
1581 cp = wc.c;
1582#endif
1583 wc.word = word;
1584#define printable_char(c) \
1585 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1586 for (j = 0; j < bytesperword; j++)
1587 *c++ = printable_char(*cp++);
1588 addr += bytesperword;
1589#undef printable_char
1590 }
1591 }
1592 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1593 " ", cbuf);
1594}
1595
1596static int kdb_md(int argc, const char **argv)
1597{
1598 static unsigned long last_addr;
1599 static int last_radix, last_bytesperword, last_repeat;
1600 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1601 int nosect = 0;
1602 char fmtchar, fmtstr[64];
1603 unsigned long addr;
1604 unsigned long word;
1605 long offset = 0;
1606 int symbolic = 0;
1607 int valid = 0;
1608 int phys = 0;
1609 int raw = 0;
1610
1611 kdbgetintenv("MDCOUNT", &mdcount);
1612 kdbgetintenv("RADIX", &radix);
1613 kdbgetintenv("BYTESPERWORD", &bytesperword);
1614
1615 /* Assume 'md <addr>' and start with environment values */
1616 repeat = mdcount * 16 / bytesperword;
1617
1618 if (strcmp(argv[0], "mdr") == 0) {
1619 if (argc == 2 || (argc == 0 && last_addr != 0))
1620 valid = raw = 1;
1621 else
1622 return KDB_ARGCOUNT;
1623 } else if (isdigit(argv[0][2])) {
1624 bytesperword = (int)(argv[0][2] - '0');
1625 if (bytesperword == 0) {
1626 bytesperword = last_bytesperword;
1627 if (bytesperword == 0)
1628 bytesperword = 4;
1629 }
1630 last_bytesperword = bytesperword;
1631 repeat = mdcount * 16 / bytesperword;
1632 if (!argv[0][3])
1633 valid = 1;
1634 else if (argv[0][3] == 'c' && argv[0][4]) {
1635 char *p;
1636 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1637 mdcount = ((repeat * bytesperword) + 15) / 16;
1638 valid = !*p;
1639 }
1640 last_repeat = repeat;
1641 } else if (strcmp(argv[0], "md") == 0)
1642 valid = 1;
1643 else if (strcmp(argv[0], "mds") == 0)
1644 valid = 1;
1645 else if (strcmp(argv[0], "mdp") == 0) {
1646 phys = valid = 1;
1647 }
1648 if (!valid)
1649 return KDB_NOTFOUND;
1650
1651 if (argc == 0) {
1652 if (last_addr == 0)
1653 return KDB_ARGCOUNT;
1654 addr = last_addr;
1655 radix = last_radix;
1656 bytesperword = last_bytesperword;
1657 repeat = last_repeat;
1658 if (raw)
1659 mdcount = repeat;
1660 else
1661 mdcount = ((repeat * bytesperword) + 15) / 16;
1662 }
1663
1664 if (argc) {
1665 unsigned long val;
1666 int diag, nextarg = 1;
1667 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1668 &offset, NULL);
1669 if (diag)
1670 return diag;
1671 if (argc > nextarg+2)
1672 return KDB_ARGCOUNT;
1673
1674 if (argc >= nextarg) {
1675 diag = kdbgetularg(argv[nextarg], &val);
1676 if (!diag) {
1677 mdcount = (int) val;
1678 if (raw)
1679 repeat = mdcount;
1680 else
1681 repeat = mdcount * 16 / bytesperword;
1682 }
1683 }
1684 if (argc >= nextarg+1) {
1685 diag = kdbgetularg(argv[nextarg+1], &val);
1686 if (!diag)
1687 radix = (int) val;
1688 }
1689 }
1690
1691 if (strcmp(argv[0], "mdr") == 0) {
1692 int ret;
1693 last_addr = addr;
1694 ret = kdb_mdr(addr, mdcount);
1695 last_addr += mdcount;
1696 last_repeat = mdcount;
1697 last_bytesperword = bytesperword; // to make REPEAT happy
1698 return ret;
1699 }
1700
1701 switch (radix) {
1702 case 10:
1703 fmtchar = 'd';
1704 break;
1705 case 16:
1706 fmtchar = 'x';
1707 break;
1708 case 8:
1709 fmtchar = 'o';
1710 break;
1711 default:
1712 return KDB_BADRADIX;
1713 }
1714
1715 last_radix = radix;
1716
1717 if (bytesperword > KDB_WORD_SIZE)
1718 return KDB_BADWIDTH;
1719
1720 switch (bytesperword) {
1721 case 8:
1722 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1723 break;
1724 case 4:
1725 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1726 break;
1727 case 2:
1728 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1729 break;
1730 case 1:
1731 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1732 break;
1733 default:
1734 return KDB_BADWIDTH;
1735 }
1736
1737 last_repeat = repeat;
1738 last_bytesperword = bytesperword;
1739
1740 if (strcmp(argv[0], "mds") == 0) {
1741 symbolic = 1;
1742 /* Do not save these changes as last_*, they are temporary mds
1743 * overrides.
1744 */
1745 bytesperword = KDB_WORD_SIZE;
1746 repeat = mdcount;
1747 kdbgetintenv("NOSECT", &nosect);
1748 }
1749
1750 /* Round address down modulo BYTESPERWORD */
1751
1752 addr &= ~(bytesperword-1);
1753
1754 while (repeat > 0) {
1755 unsigned long a;
1756 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1757
1758 if (KDB_FLAG(CMD_INTERRUPT))
1759 return 0;
1760 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1761 if (phys) {
1762 if (kdb_getphysword(&word, a, bytesperword)
1763 || word)
1764 break;
1765 } else if (kdb_getword(&word, a, bytesperword) || word)
1766 break;
1767 }
1768 n = min(num, repeat);
1769 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1770 num, repeat, phys);
1771 addr += bytesperword * n;
1772 repeat -= n;
1773 z = (z + num - 1) / num;
1774 if (z > 2) {
1775 int s = num * (z-2);
1776 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1777 " zero suppressed\n",
1778 addr, addr + bytesperword * s - 1);
1779 addr += bytesperword * s;
1780 repeat -= s;
1781 }
1782 }
1783 last_addr = addr;
1784
1785 return 0;
1786}
1787
1788/*
1789 * kdb_mm - This function implements the 'mm' command.
1790 * mm address-expression new-value
1791 * Remarks:
1792 * mm works on machine words, mmW works on bytes.
1793 */
1794static int kdb_mm(int argc, const char **argv)
1795{
1796 int diag;
1797 unsigned long addr;
1798 long offset = 0;
1799 unsigned long contents;
1800 int nextarg;
1801 int width;
1802
1803 if (argv[0][2] && !isdigit(argv[0][2]))
1804 return KDB_NOTFOUND;
1805
1806 if (argc < 2)
1807 return KDB_ARGCOUNT;
1808
1809 nextarg = 1;
1810 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1811 if (diag)
1812 return diag;
1813
1814 if (nextarg > argc)
1815 return KDB_ARGCOUNT;
1816 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1817 if (diag)
1818 return diag;
1819
1820 if (nextarg != argc + 1)
1821 return KDB_ARGCOUNT;
1822
1823 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1824 diag = kdb_putword(addr, contents, width);
1825 if (diag)
1826 return diag;
1827
1828 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1829
1830 return 0;
1831}
1832
1833/*
1834 * kdb_go - This function implements the 'go' command.
1835 * go [address-expression]
1836 */
1837static int kdb_go(int argc, const char **argv)
1838{
1839 unsigned long addr;
1840 int diag;
1841 int nextarg;
1842 long offset;
1843
1844 if (raw_smp_processor_id() != kdb_initial_cpu) {
1845 kdb_printf("go must execute on the entry cpu, "
1846 "please use \"cpu %d\" and then execute go\n",
1847 kdb_initial_cpu);
1848 return KDB_BADCPUNUM;
1849 }
1850 if (argc == 1) {
1851 nextarg = 1;
1852 diag = kdbgetaddrarg(argc, argv, &nextarg,
1853 &addr, &offset, NULL);
1854 if (diag)
1855 return diag;
1856 } else if (argc) {
1857 return KDB_ARGCOUNT;
1858 }
1859
1860 diag = KDB_CMD_GO;
1861 if (KDB_FLAG(CATASTROPHIC)) {
1862 kdb_printf("Catastrophic error detected\n");
1863 kdb_printf("kdb_continue_catastrophic=%d, ",
1864 kdb_continue_catastrophic);
1865 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1866 kdb_printf("type go a second time if you really want "
1867 "to continue\n");
1868 return 0;
1869 }
1870 if (kdb_continue_catastrophic == 2) {
1871 kdb_printf("forcing reboot\n");
1872 kdb_reboot(0, NULL);
1873 }
1874 kdb_printf("attempting to continue\n");
1875 }
1876 return diag;
1877}
1878
1879/*
1880 * kdb_rd - This function implements the 'rd' command.
1881 */
1882static int kdb_rd(int argc, const char **argv)
1883{
1884 int len = kdb_check_regs();
1885#if DBG_MAX_REG_NUM > 0
1886 int i;
1887 char *rname;
1888 int rsize;
1889 u64 reg64;
1890 u32 reg32;
1891 u16 reg16;
1892 u8 reg8;
1893
1894 if (len)
1895 return len;
1896
1897 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1898 rsize = dbg_reg_def[i].size * 2;
1899 if (rsize > 16)
1900 rsize = 2;
1901 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1902 len = 0;
1903 kdb_printf("\n");
1904 }
1905 if (len)
1906 len += kdb_printf(" ");
1907 switch(dbg_reg_def[i].size * 8) {
1908 case 8:
1909 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1910 if (!rname)
1911 break;
1912 len += kdb_printf("%s: %02x", rname, reg8);
1913 break;
1914 case 16:
1915 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1916 if (!rname)
1917 break;
1918 len += kdb_printf("%s: %04x", rname, reg16);
1919 break;
1920 case 32:
1921 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1922 if (!rname)
1923 break;
1924 len += kdb_printf("%s: %08x", rname, reg32);
1925 break;
1926 case 64:
1927 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1928 if (!rname)
1929 break;
1930 len += kdb_printf("%s: %016llx", rname, reg64);
1931 break;
1932 default:
1933 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1934 }
1935 }
1936 kdb_printf("\n");
1937#else
1938 if (len)
1939 return len;
1940
1941 kdb_dumpregs(kdb_current_regs);
1942#endif
1943 return 0;
1944}
1945
1946/*
1947 * kdb_rm - This function implements the 'rm' (register modify) command.
1948 * rm register-name new-contents
1949 * Remarks:
1950 * Allows register modification with the same restrictions as gdb
1951 */
1952static int kdb_rm(int argc, const char **argv)
1953{
1954#if DBG_MAX_REG_NUM > 0
1955 int diag;
1956 const char *rname;
1957 int i;
1958 u64 reg64;
1959 u32 reg32;
1960 u16 reg16;
1961 u8 reg8;
1962
1963 if (argc != 2)
1964 return KDB_ARGCOUNT;
1965 /*
1966 * Allow presence or absence of leading '%' symbol.
1967 */
1968 rname = argv[1];
1969 if (*rname == '%')
1970 rname++;
1971
1972 diag = kdbgetu64arg(argv[2], ®64);
1973 if (diag)
1974 return diag;
1975
1976 diag = kdb_check_regs();
1977 if (diag)
1978 return diag;
1979
1980 diag = KDB_BADREG;
1981 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1982 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1983 diag = 0;
1984 break;
1985 }
1986 }
1987 if (!diag) {
1988 switch(dbg_reg_def[i].size * 8) {
1989 case 8:
1990 reg8 = reg64;
1991 dbg_set_reg(i, ®8, kdb_current_regs);
1992 break;
1993 case 16:
1994 reg16 = reg64;
1995 dbg_set_reg(i, ®16, kdb_current_regs);
1996 break;
1997 case 32:
1998 reg32 = reg64;
1999 dbg_set_reg(i, ®32, kdb_current_regs);
2000 break;
2001 case 64:
2002 dbg_set_reg(i, ®64, kdb_current_regs);
2003 break;
2004 }
2005 }
2006 return diag;
2007#else
2008 kdb_printf("ERROR: Register set currently not implemented\n");
2009 return 0;
2010#endif
2011}
2012
2013#if defined(CONFIG_MAGIC_SYSRQ)
2014/*
2015 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
2016 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
2017 * sr <magic-sysrq-code>
2018 */
2019static int kdb_sr(int argc, const char **argv)
2020{
2021 bool check_mask =
2022 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
2023
2024 if (argc != 1)
2025 return KDB_ARGCOUNT;
2026
2027 kdb_trap_printk++;
2028 __handle_sysrq(*argv[1], check_mask);
2029 kdb_trap_printk--;
2030
2031 return 0;
2032}
2033#endif /* CONFIG_MAGIC_SYSRQ */
2034
2035/*
2036 * kdb_ef - This function implements the 'regs' (display exception
2037 * frame) command. This command takes an address and expects to
2038 * find an exception frame at that address, formats and prints
2039 * it.
2040 * regs address-expression
2041 * Remarks:
2042 * Not done yet.
2043 */
2044static int kdb_ef(int argc, const char **argv)
2045{
2046 int diag;
2047 unsigned long addr;
2048 long offset;
2049 int nextarg;
2050
2051 if (argc != 1)
2052 return KDB_ARGCOUNT;
2053
2054 nextarg = 1;
2055 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2056 if (diag)
2057 return diag;
2058 show_regs((struct pt_regs *)addr);
2059 return 0;
2060}
2061
2062/*
2063 * kdb_env - This function implements the 'env' command. Display the
2064 * current environment variables.
2065 */
2066
2067static int kdb_env(int argc, const char **argv)
2068{
2069 kdb_printenv();
2070
2071 if (KDB_DEBUG(MASK))
2072 kdb_printf("KDBDEBUG=0x%x\n",
2073 (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
2074
2075 return 0;
2076}
2077
2078#ifdef CONFIG_PRINTK
2079/*
2080 * kdb_dmesg - This function implements the 'dmesg' command to display
2081 * the contents of the syslog buffer.
2082 * dmesg [lines] [adjust]
2083 */
2084static int kdb_dmesg(int argc, const char **argv)
2085{
2086 int diag;
2087 int logging;
2088 int lines = 0;
2089 int adjust = 0;
2090 int n = 0;
2091 int skip = 0;
2092 struct kmsg_dump_iter iter;
2093 size_t len;
2094 char buf[201];
2095
2096 if (argc > 2)
2097 return KDB_ARGCOUNT;
2098 if (argc) {
2099 char *cp;
2100 lines = simple_strtol(argv[1], &cp, 0);
2101 if (*cp)
2102 lines = 0;
2103 if (argc > 1) {
2104 adjust = simple_strtoul(argv[2], &cp, 0);
2105 if (*cp || adjust < 0)
2106 adjust = 0;
2107 }
2108 }
2109
2110 /* disable LOGGING if set */
2111 diag = kdbgetintenv("LOGGING", &logging);
2112 if (!diag && logging) {
2113 const char *setargs[] = { "set", "LOGGING", "0" };
2114 kdb_set(2, setargs);
2115 }
2116
2117 kmsg_dump_rewind(&iter);
2118 while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL))
2119 n++;
2120
2121 if (lines < 0) {
2122 if (adjust >= n)
2123 kdb_printf("buffer only contains %d lines, nothing "
2124 "printed\n", n);
2125 else if (adjust - lines >= n)
2126 kdb_printf("buffer only contains %d lines, last %d "
2127 "lines printed\n", n, n - adjust);
2128 skip = adjust;
2129 lines = abs(lines);
2130 } else if (lines > 0) {
2131 skip = n - lines - adjust;
2132 lines = abs(lines);
2133 if (adjust >= n) {
2134 kdb_printf("buffer only contains %d lines, "
2135 "nothing printed\n", n);
2136 skip = n;
2137 } else if (skip < 0) {
2138 lines += skip;
2139 skip = 0;
2140 kdb_printf("buffer only contains %d lines, first "
2141 "%d lines printed\n", n, lines);
2142 }
2143 } else {
2144 lines = n;
2145 }
2146
2147 if (skip >= n || skip < 0)
2148 return 0;
2149
2150 kmsg_dump_rewind(&iter);
2151 while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) {
2152 if (skip) {
2153 skip--;
2154 continue;
2155 }
2156 if (!lines--)
2157 break;
2158 if (KDB_FLAG(CMD_INTERRUPT))
2159 return 0;
2160
2161 kdb_printf("%.*s\n", (int)len - 1, buf);
2162 }
2163
2164 return 0;
2165}
2166#endif /* CONFIG_PRINTK */
2167
2168/* Make sure we balance enable/disable calls, must disable first. */
2169static atomic_t kdb_nmi_disabled;
2170
2171static int kdb_disable_nmi(int argc, const char *argv[])
2172{
2173 if (atomic_read(&kdb_nmi_disabled))
2174 return 0;
2175 atomic_set(&kdb_nmi_disabled, 1);
2176 arch_kgdb_ops.enable_nmi(0);
2177 return 0;
2178}
2179
2180static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2181{
2182 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2183 return -EINVAL;
2184 arch_kgdb_ops.enable_nmi(1);
2185 return 0;
2186}
2187
2188static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2189 .set = kdb_param_enable_nmi,
2190};
2191module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2192
2193/*
2194 * kdb_cpu - This function implements the 'cpu' command.
2195 * cpu [<cpunum>]
2196 * Returns:
2197 * KDB_CMD_CPU for success, a kdb diagnostic if error
2198 */
2199static void kdb_cpu_status(void)
2200{
2201 int i, start_cpu, first_print = 1;
2202 char state, prev_state = '?';
2203
2204 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2205 kdb_printf("Available cpus: ");
2206 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2207 if (!cpu_online(i)) {
2208 state = 'F'; /* cpu is offline */
2209 } else if (!kgdb_info[i].enter_kgdb) {
2210 state = 'D'; /* cpu is online but unresponsive */
2211 } else {
2212 state = ' '; /* cpu is responding to kdb */
2213 if (kdb_task_state_char(KDB_TSK(i)) == '-')
2214 state = '-'; /* idle task */
2215 }
2216 if (state != prev_state) {
2217 if (prev_state != '?') {
2218 if (!first_print)
2219 kdb_printf(", ");
2220 first_print = 0;
2221 kdb_printf("%d", start_cpu);
2222 if (start_cpu < i-1)
2223 kdb_printf("-%d", i-1);
2224 if (prev_state != ' ')
2225 kdb_printf("(%c)", prev_state);
2226 }
2227 prev_state = state;
2228 start_cpu = i;
2229 }
2230 }
2231 /* print the trailing cpus, ignoring them if they are all offline */
2232 if (prev_state != 'F') {
2233 if (!first_print)
2234 kdb_printf(", ");
2235 kdb_printf("%d", start_cpu);
2236 if (start_cpu < i-1)
2237 kdb_printf("-%d", i-1);
2238 if (prev_state != ' ')
2239 kdb_printf("(%c)", prev_state);
2240 }
2241 kdb_printf("\n");
2242}
2243
2244static int kdb_cpu(int argc, const char **argv)
2245{
2246 unsigned long cpunum;
2247 int diag;
2248
2249 if (argc == 0) {
2250 kdb_cpu_status();
2251 return 0;
2252 }
2253
2254 if (argc != 1)
2255 return KDB_ARGCOUNT;
2256
2257 diag = kdbgetularg(argv[1], &cpunum);
2258 if (diag)
2259 return diag;
2260
2261 /*
2262 * Validate cpunum
2263 */
2264 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2265 return KDB_BADCPUNUM;
2266
2267 dbg_switch_cpu = cpunum;
2268
2269 /*
2270 * Switch to other cpu
2271 */
2272 return KDB_CMD_CPU;
2273}
2274
2275/* The user may not realize that ps/bta with no parameters does not print idle
2276 * or sleeping system daemon processes, so tell them how many were suppressed.
2277 */
2278void kdb_ps_suppressed(void)
2279{
2280 int idle = 0, daemon = 0;
2281 unsigned long cpu;
2282 const struct task_struct *p, *g;
2283 for_each_online_cpu(cpu) {
2284 p = kdb_curr_task(cpu);
2285 if (kdb_task_state(p, "-"))
2286 ++idle;
2287 }
2288 for_each_process_thread(g, p) {
2289 if (kdb_task_state(p, "ims"))
2290 ++daemon;
2291 }
2292 if (idle || daemon) {
2293 if (idle)
2294 kdb_printf("%d idle process%s (state -)%s\n",
2295 idle, idle == 1 ? "" : "es",
2296 daemon ? " and " : "");
2297 if (daemon)
2298 kdb_printf("%d sleeping system daemon (state [ims]) "
2299 "process%s", daemon,
2300 daemon == 1 ? "" : "es");
2301 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2302 }
2303}
2304
2305void kdb_ps1(const struct task_struct *p)
2306{
2307 int cpu;
2308 unsigned long tmp;
2309
2310 if (!p ||
2311 copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
2312 return;
2313
2314 cpu = kdb_process_cpu(p);
2315 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2316 (void *)p, p->pid, p->parent->pid,
2317 kdb_task_has_cpu(p), kdb_process_cpu(p),
2318 kdb_task_state_char(p),
2319 (void *)(&p->thread),
2320 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2321 p->comm);
2322 if (kdb_task_has_cpu(p)) {
2323 if (!KDB_TSK(cpu)) {
2324 kdb_printf(" Error: no saved data for this cpu\n");
2325 } else {
2326 if (KDB_TSK(cpu) != p)
2327 kdb_printf(" Error: does not match running "
2328 "process table (0x%px)\n", KDB_TSK(cpu));
2329 }
2330 }
2331}
2332
2333/*
2334 * kdb_ps - This function implements the 'ps' command which shows a
2335 * list of the active processes.
2336 *
2337 * ps [<state_chars>] Show processes, optionally selecting only those whose
2338 * state character is found in <state_chars>.
2339 */
2340static int kdb_ps(int argc, const char **argv)
2341{
2342 struct task_struct *g, *p;
2343 const char *mask;
2344 unsigned long cpu;
2345
2346 if (argc == 0)
2347 kdb_ps_suppressed();
2348 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2349 (int)(2*sizeof(void *))+2, "Task Addr",
2350 (int)(2*sizeof(void *))+2, "Thread");
2351 mask = argc ? argv[1] : kdbgetenv("PS");
2352 /* Run the active tasks first */
2353 for_each_online_cpu(cpu) {
2354 if (KDB_FLAG(CMD_INTERRUPT))
2355 return 0;
2356 p = kdb_curr_task(cpu);
2357 if (kdb_task_state(p, mask))
2358 kdb_ps1(p);
2359 }
2360 kdb_printf("\n");
2361 /* Now the real tasks */
2362 for_each_process_thread(g, p) {
2363 if (KDB_FLAG(CMD_INTERRUPT))
2364 return 0;
2365 if (kdb_task_state(p, mask))
2366 kdb_ps1(p);
2367 }
2368
2369 return 0;
2370}
2371
2372/*
2373 * kdb_pid - This function implements the 'pid' command which switches
2374 * the currently active process.
2375 * pid [<pid> | R]
2376 */
2377static int kdb_pid(int argc, const char **argv)
2378{
2379 struct task_struct *p;
2380 unsigned long val;
2381 int diag;
2382
2383 if (argc > 1)
2384 return KDB_ARGCOUNT;
2385
2386 if (argc) {
2387 if (strcmp(argv[1], "R") == 0) {
2388 p = KDB_TSK(kdb_initial_cpu);
2389 } else {
2390 diag = kdbgetularg(argv[1], &val);
2391 if (diag)
2392 return KDB_BADINT;
2393
2394 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2395 if (!p) {
2396 kdb_printf("No task with pid=%d\n", (pid_t)val);
2397 return 0;
2398 }
2399 }
2400 kdb_set_current_task(p);
2401 }
2402 kdb_printf("KDB current process is %s(pid=%d)\n",
2403 kdb_current_task->comm,
2404 kdb_current_task->pid);
2405
2406 return 0;
2407}
2408
2409static int kdb_kgdb(int argc, const char **argv)
2410{
2411 return KDB_CMD_KGDB;
2412}
2413
2414/*
2415 * kdb_help - This function implements the 'help' and '?' commands.
2416 */
2417static int kdb_help(int argc, const char **argv)
2418{
2419 kdbtab_t *kt;
2420
2421 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2422 kdb_printf("-----------------------------"
2423 "-----------------------------\n");
2424 list_for_each_entry(kt, &kdb_cmds_head, list_node) {
2425 char *space = "";
2426 if (KDB_FLAG(CMD_INTERRUPT))
2427 return 0;
2428 if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
2429 continue;
2430 if (strlen(kt->usage) > 20)
2431 space = "\n ";
2432 kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
2433 kt->usage, space, kt->help);
2434 }
2435 return 0;
2436}
2437
2438/*
2439 * kdb_kill - This function implements the 'kill' commands.
2440 */
2441static int kdb_kill(int argc, const char **argv)
2442{
2443 long sig, pid;
2444 char *endp;
2445 struct task_struct *p;
2446
2447 if (argc != 2)
2448 return KDB_ARGCOUNT;
2449
2450 sig = simple_strtol(argv[1], &endp, 0);
2451 if (*endp)
2452 return KDB_BADINT;
2453 if ((sig >= 0) || !valid_signal(-sig)) {
2454 kdb_printf("Invalid signal parameter.<-signal>\n");
2455 return 0;
2456 }
2457 sig = -sig;
2458
2459 pid = simple_strtol(argv[2], &endp, 0);
2460 if (*endp)
2461 return KDB_BADINT;
2462 if (pid <= 0) {
2463 kdb_printf("Process ID must be large than 0.\n");
2464 return 0;
2465 }
2466
2467 /* Find the process. */
2468 p = find_task_by_pid_ns(pid, &init_pid_ns);
2469 if (!p) {
2470 kdb_printf("The specified process isn't found.\n");
2471 return 0;
2472 }
2473 p = p->group_leader;
2474 kdb_send_sig(p, sig);
2475 return 0;
2476}
2477
2478/*
2479 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2480 * I cannot call that code directly from kdb, it has an unconditional
2481 * cli()/sti() and calls routines that take locks which can stop the debugger.
2482 */
2483static void kdb_sysinfo(struct sysinfo *val)
2484{
2485 u64 uptime = ktime_get_mono_fast_ns();
2486
2487 memset(val, 0, sizeof(*val));
2488 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2489 val->loads[0] = avenrun[0];
2490 val->loads[1] = avenrun[1];
2491 val->loads[2] = avenrun[2];
2492 val->procs = nr_threads-1;
2493 si_meminfo(val);
2494
2495 return;
2496}
2497
2498/*
2499 * kdb_summary - This function implements the 'summary' command.
2500 */
2501static int kdb_summary(int argc, const char **argv)
2502{
2503 time64_t now;
2504 struct sysinfo val;
2505
2506 if (argc)
2507 return KDB_ARGCOUNT;
2508
2509 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2510 kdb_printf("release %s\n", init_uts_ns.name.release);
2511 kdb_printf("version %s\n", init_uts_ns.name.version);
2512 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2513 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2514 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2515
2516 now = __ktime_get_real_seconds();
2517 kdb_printf("date %ptTs tz_minuteswest %d\n", &now, sys_tz.tz_minuteswest);
2518 kdb_sysinfo(&val);
2519 kdb_printf("uptime ");
2520 if (val.uptime > (24*60*60)) {
2521 int days = val.uptime / (24*60*60);
2522 val.uptime %= (24*60*60);
2523 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2524 }
2525 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2526
2527 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2528 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2529 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2530 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2531
2532 /* Display in kilobytes */
2533#define K(x) ((x) << (PAGE_SHIFT - 10))
2534 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2535 "Buffers: %8lu kB\n",
2536 K(val.totalram), K(val.freeram), K(val.bufferram));
2537 return 0;
2538}
2539
2540/*
2541 * kdb_per_cpu - This function implements the 'per_cpu' command.
2542 */
2543static int kdb_per_cpu(int argc, const char **argv)
2544{
2545 char fmtstr[64];
2546 int cpu, diag, nextarg = 1;
2547 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2548
2549 if (argc < 1 || argc > 3)
2550 return KDB_ARGCOUNT;
2551
2552 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2553 if (diag)
2554 return diag;
2555
2556 if (argc >= 2) {
2557 diag = kdbgetularg(argv[2], &bytesperword);
2558 if (diag)
2559 return diag;
2560 }
2561 if (!bytesperword)
2562 bytesperword = KDB_WORD_SIZE;
2563 else if (bytesperword > KDB_WORD_SIZE)
2564 return KDB_BADWIDTH;
2565 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2566 if (argc >= 3) {
2567 diag = kdbgetularg(argv[3], &whichcpu);
2568 if (diag)
2569 return diag;
2570 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2571 kdb_printf("cpu %ld is not online\n", whichcpu);
2572 return KDB_BADCPUNUM;
2573 }
2574 }
2575
2576 /* Most architectures use __per_cpu_offset[cpu], some use
2577 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2578 */
2579#ifdef __per_cpu_offset
2580#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2581#else
2582#ifdef CONFIG_SMP
2583#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2584#else
2585#define KDB_PCU(cpu) 0
2586#endif
2587#endif
2588 for_each_online_cpu(cpu) {
2589 if (KDB_FLAG(CMD_INTERRUPT))
2590 return 0;
2591
2592 if (whichcpu != ~0UL && whichcpu != cpu)
2593 continue;
2594 addr = symaddr + KDB_PCU(cpu);
2595 diag = kdb_getword(&val, addr, bytesperword);
2596 if (diag) {
2597 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2598 "read, diag=%d\n", cpu, addr, diag);
2599 continue;
2600 }
2601 kdb_printf("%5d ", cpu);
2602 kdb_md_line(fmtstr, addr,
2603 bytesperword == KDB_WORD_SIZE,
2604 1, bytesperword, 1, 1, 0);
2605 }
2606#undef KDB_PCU
2607 return 0;
2608}
2609
2610/*
2611 * display help for the use of cmd | grep pattern
2612 */
2613static int kdb_grep_help(int argc, const char **argv)
2614{
2615 kdb_printf("Usage of cmd args | grep pattern:\n");
2616 kdb_printf(" Any command's output may be filtered through an ");
2617 kdb_printf("emulated 'pipe'.\n");
2618 kdb_printf(" 'grep' is just a key word.\n");
2619 kdb_printf(" The pattern may include a very limited set of "
2620 "metacharacters:\n");
2621 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2622 kdb_printf(" And if there are spaces in the pattern, you may "
2623 "quote it:\n");
2624 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2625 " or \"^pat tern$\"\n");
2626 return 0;
2627}
2628
2629/**
2630 * kdb_register() - This function is used to register a kernel debugger
2631 * command.
2632 * @cmd: pointer to kdb command
2633 *
2634 * Note that it's the job of the caller to keep the memory for the cmd
2635 * allocated until unregister is called.
2636 */
2637int kdb_register(kdbtab_t *cmd)
2638{
2639 kdbtab_t *kp;
2640
2641 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
2642 if (strcmp(kp->name, cmd->name) == 0) {
2643 kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
2644 cmd->name, cmd->func, cmd->help);
2645 return 1;
2646 }
2647 }
2648
2649 list_add_tail(&cmd->list_node, &kdb_cmds_head);
2650 return 0;
2651}
2652EXPORT_SYMBOL_GPL(kdb_register);
2653
2654/**
2655 * kdb_register_table() - This function is used to register a kdb command
2656 * table.
2657 * @kp: pointer to kdb command table
2658 * @len: length of kdb command table
2659 */
2660void kdb_register_table(kdbtab_t *kp, size_t len)
2661{
2662 while (len--) {
2663 list_add_tail(&kp->list_node, &kdb_cmds_head);
2664 kp++;
2665 }
2666}
2667
2668/**
2669 * kdb_unregister() - This function is used to unregister a kernel debugger
2670 * command. It is generally called when a module which
2671 * implements kdb command is unloaded.
2672 * @cmd: pointer to kdb command
2673 */
2674void kdb_unregister(kdbtab_t *cmd)
2675{
2676 list_del(&cmd->list_node);
2677}
2678EXPORT_SYMBOL_GPL(kdb_unregister);
2679
2680static kdbtab_t maintab[] = {
2681 { .name = "md",
2682 .func = kdb_md,
2683 .usage = "<vaddr>",
2684 .help = "Display Memory Contents, also mdWcN, e.g. md8c1",
2685 .minlen = 1,
2686 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2687 },
2688 { .name = "mdr",
2689 .func = kdb_md,
2690 .usage = "<vaddr> <bytes>",
2691 .help = "Display Raw Memory",
2692 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2693 },
2694 { .name = "mdp",
2695 .func = kdb_md,
2696 .usage = "<paddr> <bytes>",
2697 .help = "Display Physical Memory",
2698 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2699 },
2700 { .name = "mds",
2701 .func = kdb_md,
2702 .usage = "<vaddr>",
2703 .help = "Display Memory Symbolically",
2704 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2705 },
2706 { .name = "mm",
2707 .func = kdb_mm,
2708 .usage = "<vaddr> <contents>",
2709 .help = "Modify Memory Contents",
2710 .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
2711 },
2712 { .name = "go",
2713 .func = kdb_go,
2714 .usage = "[<vaddr>]",
2715 .help = "Continue Execution",
2716 .minlen = 1,
2717 .flags = KDB_ENABLE_REG_WRITE |
2718 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2719 },
2720 { .name = "rd",
2721 .func = kdb_rd,
2722 .usage = "",
2723 .help = "Display Registers",
2724 .flags = KDB_ENABLE_REG_READ,
2725 },
2726 { .name = "rm",
2727 .func = kdb_rm,
2728 .usage = "<reg> <contents>",
2729 .help = "Modify Registers",
2730 .flags = KDB_ENABLE_REG_WRITE,
2731 },
2732 { .name = "ef",
2733 .func = kdb_ef,
2734 .usage = "<vaddr>",
2735 .help = "Display exception frame",
2736 .flags = KDB_ENABLE_MEM_READ,
2737 },
2738 { .name = "bt",
2739 .func = kdb_bt,
2740 .usage = "[<vaddr>]",
2741 .help = "Stack traceback",
2742 .minlen = 1,
2743 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2744 },
2745 { .name = "btp",
2746 .func = kdb_bt,
2747 .usage = "<pid>",
2748 .help = "Display stack for process <pid>",
2749 .flags = KDB_ENABLE_INSPECT,
2750 },
2751 { .name = "bta",
2752 .func = kdb_bt,
2753 .usage = "[<state_chars>|A]",
2754 .help = "Backtrace all processes whose state matches",
2755 .flags = KDB_ENABLE_INSPECT,
2756 },
2757 { .name = "btc",
2758 .func = kdb_bt,
2759 .usage = "",
2760 .help = "Backtrace current process on each cpu",
2761 .flags = KDB_ENABLE_INSPECT,
2762 },
2763 { .name = "btt",
2764 .func = kdb_bt,
2765 .usage = "<vaddr>",
2766 .help = "Backtrace process given its struct task address",
2767 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2768 },
2769 { .name = "env",
2770 .func = kdb_env,
2771 .usage = "",
2772 .help = "Show environment variables",
2773 .flags = KDB_ENABLE_ALWAYS_SAFE,
2774 },
2775 { .name = "set",
2776 .func = kdb_set,
2777 .usage = "",
2778 .help = "Set environment variables",
2779 .flags = KDB_ENABLE_ALWAYS_SAFE,
2780 },
2781 { .name = "help",
2782 .func = kdb_help,
2783 .usage = "",
2784 .help = "Display Help Message",
2785 .minlen = 1,
2786 .flags = KDB_ENABLE_ALWAYS_SAFE,
2787 },
2788 { .name = "?",
2789 .func = kdb_help,
2790 .usage = "",
2791 .help = "Display Help Message",
2792 .flags = KDB_ENABLE_ALWAYS_SAFE,
2793 },
2794 { .name = "cpu",
2795 .func = kdb_cpu,
2796 .usage = "<cpunum>",
2797 .help = "Switch to new cpu",
2798 .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2799 },
2800 { .name = "kgdb",
2801 .func = kdb_kgdb,
2802 .usage = "",
2803 .help = "Enter kgdb mode",
2804 .flags = 0,
2805 },
2806 { .name = "ps",
2807 .func = kdb_ps,
2808 .usage = "[<state_chars>|A]",
2809 .help = "Display active task list",
2810 .flags = KDB_ENABLE_INSPECT,
2811 },
2812 { .name = "pid",
2813 .func = kdb_pid,
2814 .usage = "<pidnum>",
2815 .help = "Switch to another task",
2816 .flags = KDB_ENABLE_INSPECT,
2817 },
2818 { .name = "reboot",
2819 .func = kdb_reboot,
2820 .usage = "",
2821 .help = "Reboot the machine immediately",
2822 .flags = KDB_ENABLE_REBOOT,
2823 },
2824#if defined(CONFIG_MODULES)
2825 { .name = "lsmod",
2826 .func = kdb_lsmod,
2827 .usage = "",
2828 .help = "List loaded kernel modules",
2829 .flags = KDB_ENABLE_INSPECT,
2830 },
2831#endif
2832#if defined(CONFIG_MAGIC_SYSRQ)
2833 { .name = "sr",
2834 .func = kdb_sr,
2835 .usage = "<key>",
2836 .help = "Magic SysRq key",
2837 .flags = KDB_ENABLE_ALWAYS_SAFE,
2838 },
2839#endif
2840#if defined(CONFIG_PRINTK)
2841 { .name = "dmesg",
2842 .func = kdb_dmesg,
2843 .usage = "[lines]",
2844 .help = "Display syslog buffer",
2845 .flags = KDB_ENABLE_ALWAYS_SAFE,
2846 },
2847#endif
2848 { .name = "defcmd",
2849 .func = kdb_defcmd,
2850 .usage = "name \"usage\" \"help\"",
2851 .help = "Define a set of commands, down to endefcmd",
2852 /*
2853 * Macros are always safe because when executed each
2854 * internal command re-enters kdb_parse() and is safety
2855 * checked individually.
2856 */
2857 .flags = KDB_ENABLE_ALWAYS_SAFE,
2858 },
2859 { .name = "kill",
2860 .func = kdb_kill,
2861 .usage = "<-signal> <pid>",
2862 .help = "Send a signal to a process",
2863 .flags = KDB_ENABLE_SIGNAL,
2864 },
2865 { .name = "summary",
2866 .func = kdb_summary,
2867 .usage = "",
2868 .help = "Summarize the system",
2869 .minlen = 4,
2870 .flags = KDB_ENABLE_ALWAYS_SAFE,
2871 },
2872 { .name = "per_cpu",
2873 .func = kdb_per_cpu,
2874 .usage = "<sym> [<bytes>] [<cpu>]",
2875 .help = "Display per_cpu variables",
2876 .minlen = 3,
2877 .flags = KDB_ENABLE_MEM_READ,
2878 },
2879 { .name = "grephelp",
2880 .func = kdb_grep_help,
2881 .usage = "",
2882 .help = "Display help on | grep",
2883 .flags = KDB_ENABLE_ALWAYS_SAFE,
2884 },
2885};
2886
2887static kdbtab_t nmicmd = {
2888 .name = "disable_nmi",
2889 .func = kdb_disable_nmi,
2890 .usage = "",
2891 .help = "Disable NMI entry to KDB",
2892 .flags = KDB_ENABLE_ALWAYS_SAFE,
2893};
2894
2895/* Initialize the kdb command table. */
2896static void __init kdb_inittab(void)
2897{
2898 kdb_register_table(maintab, ARRAY_SIZE(maintab));
2899 if (arch_kgdb_ops.enable_nmi)
2900 kdb_register_table(&nmicmd, 1);
2901}
2902
2903/* Execute any commands defined in kdb_cmds. */
2904static void __init kdb_cmd_init(void)
2905{
2906 int i, diag;
2907 for (i = 0; kdb_cmds[i]; ++i) {
2908 diag = kdb_parse(kdb_cmds[i]);
2909 if (diag)
2910 kdb_printf("kdb command %s failed, kdb diag %d\n",
2911 kdb_cmds[i], diag);
2912 }
2913 if (defcmd_in_progress) {
2914 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2915 kdb_parse("endefcmd");
2916 }
2917}
2918
2919/* Initialize kdb_printf, breakpoint tables and kdb state */
2920void __init kdb_init(int lvl)
2921{
2922 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2923 int i;
2924
2925 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2926 return;
2927 for (i = kdb_init_lvl; i < lvl; i++) {
2928 switch (i) {
2929 case KDB_NOT_INITIALIZED:
2930 kdb_inittab(); /* Initialize Command Table */
2931 kdb_initbptab(); /* Initialize Breakpoints */
2932 break;
2933 case KDB_INIT_EARLY:
2934 kdb_cmd_init(); /* Build kdb_cmds tables */
2935 break;
2936 }
2937 }
2938 kdb_init_lvl = lvl;
2939}
1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sched/loadavg.h>
22#include <linux/sched/stat.h>
23#include <linux/sched/debug.h>
24#include <linux/sysrq.h>
25#include <linux/smp.h>
26#include <linux/utsname.h>
27#include <linux/vmalloc.h>
28#include <linux/atomic.h>
29#include <linux/moduleparam.h>
30#include <linux/mm.h>
31#include <linux/init.h>
32#include <linux/kallsyms.h>
33#include <linux/kgdb.h>
34#include <linux/kdb.h>
35#include <linux/notifier.h>
36#include <linux/interrupt.h>
37#include <linux/delay.h>
38#include <linux/nmi.h>
39#include <linux/time.h>
40#include <linux/ptrace.h>
41#include <linux/sysctl.h>
42#include <linux/cpu.h>
43#include <linux/kdebug.h>
44#include <linux/proc_fs.h>
45#include <linux/uaccess.h>
46#include <linux/slab.h>
47#include <linux/security.h>
48#include "kdb_private.h"
49
50#undef MODULE_PARAM_PREFIX
51#define MODULE_PARAM_PREFIX "kdb."
52
53static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
54module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
55
56char kdb_grep_string[KDB_GREP_STRLEN];
57int kdb_grepping_flag;
58EXPORT_SYMBOL(kdb_grepping_flag);
59int kdb_grep_leading;
60int kdb_grep_trailing;
61
62/*
63 * Kernel debugger state flags
64 */
65unsigned int kdb_flags;
66
67/*
68 * kdb_lock protects updates to kdb_initial_cpu. Used to
69 * single thread processors through the kernel debugger.
70 */
71int kdb_initial_cpu = -1; /* cpu number that owns kdb */
72int kdb_nextline = 1;
73int kdb_state; /* General KDB state */
74
75struct task_struct *kdb_current_task;
76struct pt_regs *kdb_current_regs;
77
78const char *kdb_diemsg;
79static int kdb_go_count;
80#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
81static unsigned int kdb_continue_catastrophic =
82 CONFIG_KDB_CONTINUE_CATASTROPHIC;
83#else
84static unsigned int kdb_continue_catastrophic;
85#endif
86
87/* kdb_cmds_head describes the available commands. */
88static LIST_HEAD(kdb_cmds_head);
89
90typedef struct _kdbmsg {
91 int km_diag; /* kdb diagnostic */
92 char *km_msg; /* Corresponding message text */
93} kdbmsg_t;
94
95#define KDBMSG(msgnum, text) \
96 { KDB_##msgnum, text }
97
98static kdbmsg_t kdbmsgs[] = {
99 KDBMSG(NOTFOUND, "Command Not Found"),
100 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
101 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
102 "8 is only allowed on 64 bit systems"),
103 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
104 KDBMSG(NOTENV, "Cannot find environment variable"),
105 KDBMSG(NOENVVALUE, "Environment variable should have value"),
106 KDBMSG(NOTIMP, "Command not implemented"),
107 KDBMSG(ENVFULL, "Environment full"),
108 KDBMSG(ENVBUFFULL, "Environment buffer full"),
109 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
110#ifdef CONFIG_CPU_XSCALE
111 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
112#else
113 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
114#endif
115 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
116 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
117 KDBMSG(BADMODE, "Invalid IDMODE"),
118 KDBMSG(BADINT, "Illegal numeric value"),
119 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
120 KDBMSG(BADREG, "Invalid register name"),
121 KDBMSG(BADCPUNUM, "Invalid cpu number"),
122 KDBMSG(BADLENGTH, "Invalid length field"),
123 KDBMSG(NOBP, "No Breakpoint exists"),
124 KDBMSG(BADADDR, "Invalid address"),
125 KDBMSG(NOPERM, "Permission denied"),
126};
127#undef KDBMSG
128
129static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
130
131
132/*
133 * Initial environment. This is all kept static and local to
134 * this file. We don't want to rely on the memory allocation
135 * mechanisms in the kernel, so we use a very limited allocate-only
136 * heap for new and altered environment variables. The entire
137 * environment is limited to a fixed number of entries (add more
138 * to __env[] if required) and a fixed amount of heap (add more to
139 * KDB_ENVBUFSIZE if required).
140 */
141
142static char *__env[31] = {
143#if defined(CONFIG_SMP)
144 "PROMPT=[%d]kdb> ",
145#else
146 "PROMPT=kdb> ",
147#endif
148 "MOREPROMPT=more> ",
149 "RADIX=16",
150 "MDCOUNT=8", /* lines of md output */
151 KDB_PLATFORM_ENV,
152 "DTABCOUNT=30",
153 "NOSECT=1",
154};
155
156static const int __nenv = ARRAY_SIZE(__env);
157
158/*
159 * Update the permissions flags (kdb_cmd_enabled) to match the
160 * current lockdown state.
161 *
162 * Within this function the calls to security_locked_down() are "lazy". We
163 * avoid calling them if the current value of kdb_cmd_enabled already excludes
164 * flags that might be subject to lockdown. Additionally we deliberately check
165 * the lockdown flags independently (even though read lockdown implies write
166 * lockdown) since that results in both simpler code and clearer messages to
167 * the user on first-time debugger entry.
168 *
169 * The permission masks during a read+write lockdown permits the following
170 * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE).
171 *
172 * The INSPECT commands are not blocked during lockdown because they are
173 * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes
174 * forcing them to have no arguments) and lsmod. These commands do expose
175 * some kernel state but do not allow the developer seated at the console to
176 * choose what state is reported. SIGNAL and REBOOT should not be controversial,
177 * given these are allowed for root during lockdown already.
178 */
179static void kdb_check_for_lockdown(void)
180{
181 const int write_flags = KDB_ENABLE_MEM_WRITE |
182 KDB_ENABLE_REG_WRITE |
183 KDB_ENABLE_FLOW_CTRL;
184 const int read_flags = KDB_ENABLE_MEM_READ |
185 KDB_ENABLE_REG_READ;
186
187 bool need_to_lockdown_write = false;
188 bool need_to_lockdown_read = false;
189
190 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags))
191 need_to_lockdown_write =
192 security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL);
193
194 if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags))
195 need_to_lockdown_read =
196 security_locked_down(LOCKDOWN_DBG_READ_KERNEL);
197
198 /* De-compose KDB_ENABLE_ALL if required */
199 if (need_to_lockdown_write || need_to_lockdown_read)
200 if (kdb_cmd_enabled & KDB_ENABLE_ALL)
201 kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL;
202
203 if (need_to_lockdown_write)
204 kdb_cmd_enabled &= ~write_flags;
205
206 if (need_to_lockdown_read)
207 kdb_cmd_enabled &= ~read_flags;
208}
209
210/*
211 * Check whether the flags of the current command, the permissions of the kdb
212 * console and the lockdown state allow a command to be run.
213 */
214static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
215 bool no_args)
216{
217 /* permissions comes from userspace so needs massaging slightly */
218 permissions &= KDB_ENABLE_MASK;
219 permissions |= KDB_ENABLE_ALWAYS_SAFE;
220
221 /* some commands change group when launched with no arguments */
222 if (no_args)
223 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
224
225 flags |= KDB_ENABLE_ALL;
226
227 return permissions & flags;
228}
229
230/*
231 * kdbgetenv - This function will return the character string value of
232 * an environment variable.
233 * Parameters:
234 * match A character string representing an environment variable.
235 * Returns:
236 * NULL No environment variable matches 'match'
237 * char* Pointer to string value of environment variable.
238 */
239char *kdbgetenv(const char *match)
240{
241 char **ep = __env;
242 int matchlen = strlen(match);
243 int i;
244
245 for (i = 0; i < __nenv; i++) {
246 char *e = *ep++;
247
248 if (!e)
249 continue;
250
251 if ((strncmp(match, e, matchlen) == 0)
252 && ((e[matchlen] == '\0')
253 || (e[matchlen] == '='))) {
254 char *cp = strchr(e, '=');
255 return cp ? ++cp : "";
256 }
257 }
258 return NULL;
259}
260
261/*
262 * kdballocenv - This function is used to allocate bytes for
263 * environment entries.
264 * Parameters:
265 * bytes The number of bytes to allocate in the static buffer.
266 * Returns:
267 * A pointer to the allocated space in the buffer on success.
268 * NULL if bytes > size available in the envbuffer.
269 * Remarks:
270 * We use a static environment buffer (envbuffer) to hold the values
271 * of dynamically generated environment variables (see kdb_set). Buffer
272 * space once allocated is never free'd, so over time, the amount of space
273 * (currently 512 bytes) will be exhausted if env variables are changed
274 * frequently.
275 */
276static char *kdballocenv(size_t bytes)
277{
278#define KDB_ENVBUFSIZE 512
279 static char envbuffer[KDB_ENVBUFSIZE];
280 static int envbufsize;
281 char *ep = NULL;
282
283 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
284 ep = &envbuffer[envbufsize];
285 envbufsize += bytes;
286 }
287 return ep;
288}
289
290/*
291 * kdbgetulenv - This function will return the value of an unsigned
292 * long-valued environment variable.
293 * Parameters:
294 * match A character string representing a numeric value
295 * Outputs:
296 * *value the unsigned long representation of the env variable 'match'
297 * Returns:
298 * Zero on success, a kdb diagnostic on failure.
299 */
300static int kdbgetulenv(const char *match, unsigned long *value)
301{
302 char *ep;
303
304 ep = kdbgetenv(match);
305 if (!ep)
306 return KDB_NOTENV;
307 if (strlen(ep) == 0)
308 return KDB_NOENVVALUE;
309 if (kstrtoul(ep, 0, value))
310 return KDB_BADINT;
311
312 return 0;
313}
314
315/*
316 * kdbgetintenv - This function will return the value of an
317 * integer-valued environment variable.
318 * Parameters:
319 * match A character string representing an integer-valued env variable
320 * Outputs:
321 * *value the integer representation of the environment variable 'match'
322 * Returns:
323 * Zero on success, a kdb diagnostic on failure.
324 */
325int kdbgetintenv(const char *match, int *value)
326{
327 unsigned long val;
328 int diag;
329
330 diag = kdbgetulenv(match, &val);
331 if (!diag)
332 *value = (int) val;
333 return diag;
334}
335
336/*
337 * kdb_setenv() - Alter an existing environment variable or create a new one.
338 * @var: Name of the variable
339 * @val: Value of the variable
340 *
341 * Return: Zero on success, a kdb diagnostic on failure.
342 */
343static int kdb_setenv(const char *var, const char *val)
344{
345 int i;
346 char *ep;
347 size_t varlen, vallen;
348
349 varlen = strlen(var);
350 vallen = strlen(val);
351 ep = kdballocenv(varlen + vallen + 2);
352 if (ep == (char *)0)
353 return KDB_ENVBUFFULL;
354
355 sprintf(ep, "%s=%s", var, val);
356
357 for (i = 0; i < __nenv; i++) {
358 if (__env[i]
359 && ((strncmp(__env[i], var, varlen) == 0)
360 && ((__env[i][varlen] == '\0')
361 || (__env[i][varlen] == '=')))) {
362 __env[i] = ep;
363 return 0;
364 }
365 }
366
367 /*
368 * Wasn't existing variable. Fit into slot.
369 */
370 for (i = 0; i < __nenv-1; i++) {
371 if (__env[i] == (char *)0) {
372 __env[i] = ep;
373 return 0;
374 }
375 }
376
377 return KDB_ENVFULL;
378}
379
380/*
381 * kdb_printenv() - Display the current environment variables.
382 */
383static void kdb_printenv(void)
384{
385 int i;
386
387 for (i = 0; i < __nenv; i++) {
388 if (__env[i])
389 kdb_printf("%s\n", __env[i]);
390 }
391}
392
393/*
394 * kdbgetularg - This function will convert a numeric string into an
395 * unsigned long value.
396 * Parameters:
397 * arg A character string representing a numeric value
398 * Outputs:
399 * *value the unsigned long representation of arg.
400 * Returns:
401 * Zero on success, a kdb diagnostic on failure.
402 */
403int kdbgetularg(const char *arg, unsigned long *value)
404{
405 if (kstrtoul(arg, 0, value))
406 return KDB_BADINT;
407 return 0;
408}
409
410int kdbgetu64arg(const char *arg, u64 *value)
411{
412 if (kstrtou64(arg, 0, value))
413 return KDB_BADINT;
414 return 0;
415}
416
417/*
418 * kdb_set - This function implements the 'set' command. Alter an
419 * existing environment variable or create a new one.
420 */
421int kdb_set(int argc, const char **argv)
422{
423 /*
424 * we can be invoked two ways:
425 * set var=value argv[1]="var", argv[2]="value"
426 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
427 * - if the latter, shift 'em down.
428 */
429 if (argc == 3) {
430 argv[2] = argv[3];
431 argc--;
432 }
433
434 if (argc != 2)
435 return KDB_ARGCOUNT;
436
437 /*
438 * Censor sensitive variables
439 */
440 if (strcmp(argv[1], "PROMPT") == 0 &&
441 !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
442 return KDB_NOPERM;
443
444 /*
445 * Check for internal variables
446 */
447 if (strcmp(argv[1], "KDBDEBUG") == 0) {
448 unsigned int debugflags;
449 int ret;
450
451 ret = kstrtouint(argv[2], 0, &debugflags);
452 if (ret || debugflags & ~KDB_DEBUG_FLAG_MASK) {
453 kdb_printf("kdb: illegal debug flags '%s'\n",
454 argv[2]);
455 return 0;
456 }
457 kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK))
458 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
459
460 return 0;
461 }
462
463 /*
464 * Tokenizer squashed the '=' sign. argv[1] is variable
465 * name, argv[2] = value.
466 */
467 return kdb_setenv(argv[1], argv[2]);
468}
469
470static int kdb_check_regs(void)
471{
472 if (!kdb_current_regs) {
473 kdb_printf("No current kdb registers."
474 " You may need to select another task\n");
475 return KDB_BADREG;
476 }
477 return 0;
478}
479
480/*
481 * kdbgetaddrarg - This function is responsible for parsing an
482 * address-expression and returning the value of the expression,
483 * symbol name, and offset to the caller.
484 *
485 * The argument may consist of a numeric value (decimal or
486 * hexadecimal), a symbol name, a register name (preceded by the
487 * percent sign), an environment variable with a numeric value
488 * (preceded by a dollar sign) or a simple arithmetic expression
489 * consisting of a symbol name, +/-, and a numeric constant value
490 * (offset).
491 * Parameters:
492 * argc - count of arguments in argv
493 * argv - argument vector
494 * *nextarg - index to next unparsed argument in argv[]
495 * regs - Register state at time of KDB entry
496 * Outputs:
497 * *value - receives the value of the address-expression
498 * *offset - receives the offset specified, if any
499 * *name - receives the symbol name, if any
500 * *nextarg - index to next unparsed argument in argv[]
501 * Returns:
502 * zero is returned on success, a kdb diagnostic code is
503 * returned on error.
504 */
505int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
506 unsigned long *value, long *offset,
507 char **name)
508{
509 unsigned long addr;
510 unsigned long off = 0;
511 int positive;
512 int diag;
513 int found = 0;
514 char *symname;
515 char symbol = '\0';
516 char *cp;
517 kdb_symtab_t symtab;
518
519 /*
520 * If the enable flags prohibit both arbitrary memory access
521 * and flow control then there are no reasonable grounds to
522 * provide symbol lookup.
523 */
524 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
525 kdb_cmd_enabled, false))
526 return KDB_NOPERM;
527
528 /*
529 * Process arguments which follow the following syntax:
530 *
531 * symbol | numeric-address [+/- numeric-offset]
532 * %register
533 * $environment-variable
534 */
535
536 if (*nextarg > argc)
537 return KDB_ARGCOUNT;
538
539 symname = (char *)argv[*nextarg];
540
541 /*
542 * If there is no whitespace between the symbol
543 * or address and the '+' or '-' symbols, we
544 * remember the character and replace it with a
545 * null so the symbol/value can be properly parsed
546 */
547 cp = strpbrk(symname, "+-");
548 if (cp != NULL) {
549 symbol = *cp;
550 *cp++ = '\0';
551 }
552
553 if (symname[0] == '$') {
554 diag = kdbgetulenv(&symname[1], &addr);
555 if (diag)
556 return diag;
557 } else if (symname[0] == '%') {
558 diag = kdb_check_regs();
559 if (diag)
560 return diag;
561 /* Implement register values with % at a later time as it is
562 * arch optional.
563 */
564 return KDB_NOTIMP;
565 } else {
566 found = kdbgetsymval(symname, &symtab);
567 if (found) {
568 addr = symtab.sym_start;
569 } else {
570 diag = kdbgetularg(argv[*nextarg], &addr);
571 if (diag)
572 return diag;
573 }
574 }
575
576 if (!found)
577 found = kdbnearsym(addr, &symtab);
578
579 (*nextarg)++;
580
581 if (name)
582 *name = symname;
583 if (value)
584 *value = addr;
585 if (offset && name && *name)
586 *offset = addr - symtab.sym_start;
587
588 if ((*nextarg > argc)
589 && (symbol == '\0'))
590 return 0;
591
592 /*
593 * check for +/- and offset
594 */
595
596 if (symbol == '\0') {
597 if ((argv[*nextarg][0] != '+')
598 && (argv[*nextarg][0] != '-')) {
599 /*
600 * Not our argument. Return.
601 */
602 return 0;
603 } else {
604 positive = (argv[*nextarg][0] == '+');
605 (*nextarg)++;
606 }
607 } else
608 positive = (symbol == '+');
609
610 /*
611 * Now there must be an offset!
612 */
613 if ((*nextarg > argc)
614 && (symbol == '\0')) {
615 return KDB_INVADDRFMT;
616 }
617
618 if (!symbol) {
619 cp = (char *)argv[*nextarg];
620 (*nextarg)++;
621 }
622
623 diag = kdbgetularg(cp, &off);
624 if (diag)
625 return diag;
626
627 if (!positive)
628 off = -off;
629
630 if (offset)
631 *offset += off;
632
633 if (value)
634 *value += off;
635
636 return 0;
637}
638
639static void kdb_cmderror(int diag)
640{
641 int i;
642
643 if (diag >= 0) {
644 kdb_printf("no error detected (diagnostic is %d)\n", diag);
645 return;
646 }
647
648 for (i = 0; i < __nkdb_err; i++) {
649 if (kdbmsgs[i].km_diag == diag) {
650 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
651 return;
652 }
653 }
654
655 kdb_printf("Unknown diag %d\n", -diag);
656}
657
658/*
659 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
660 * command which defines one command as a set of other commands,
661 * terminated by endefcmd. kdb_defcmd processes the initial
662 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
663 * the following commands until 'endefcmd'.
664 * Inputs:
665 * argc argument count
666 * argv argument vector
667 * Returns:
668 * zero for success, a kdb diagnostic if error
669 */
670struct kdb_macro {
671 kdbtab_t cmd; /* Macro command */
672 struct list_head statements; /* Associated statement list */
673};
674
675struct kdb_macro_statement {
676 char *statement; /* Statement text */
677 struct list_head list_node; /* Statement list node */
678};
679
680static struct kdb_macro *kdb_macro;
681static bool defcmd_in_progress;
682
683/* Forward references */
684static int kdb_exec_defcmd(int argc, const char **argv);
685
686static int kdb_defcmd2(const char *cmdstr, const char *argv0)
687{
688 struct kdb_macro_statement *kms;
689
690 if (!kdb_macro)
691 return KDB_NOTIMP;
692
693 if (strcmp(argv0, "endefcmd") == 0) {
694 defcmd_in_progress = false;
695 if (!list_empty(&kdb_macro->statements))
696 kdb_register(&kdb_macro->cmd);
697 return 0;
698 }
699
700 kms = kmalloc(sizeof(*kms), GFP_KDB);
701 if (!kms) {
702 kdb_printf("Could not allocate new kdb macro command: %s\n",
703 cmdstr);
704 return KDB_NOTIMP;
705 }
706
707 kms->statement = kdb_strdup(cmdstr, GFP_KDB);
708 list_add_tail(&kms->list_node, &kdb_macro->statements);
709
710 return 0;
711}
712
713static int kdb_defcmd(int argc, const char **argv)
714{
715 kdbtab_t *mp;
716
717 if (defcmd_in_progress) {
718 kdb_printf("kdb: nested defcmd detected, assuming missing "
719 "endefcmd\n");
720 kdb_defcmd2("endefcmd", "endefcmd");
721 }
722 if (argc == 0) {
723 kdbtab_t *kp;
724 struct kdb_macro *kmp;
725 struct kdb_macro_statement *kms;
726
727 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
728 if (kp->func == kdb_exec_defcmd) {
729 kdb_printf("defcmd %s \"%s\" \"%s\"\n",
730 kp->name, kp->usage, kp->help);
731 kmp = container_of(kp, struct kdb_macro, cmd);
732 list_for_each_entry(kms, &kmp->statements,
733 list_node)
734 kdb_printf("%s", kms->statement);
735 kdb_printf("endefcmd\n");
736 }
737 }
738 return 0;
739 }
740 if (argc != 3)
741 return KDB_ARGCOUNT;
742 if (in_dbg_master()) {
743 kdb_printf("Command only available during kdb_init()\n");
744 return KDB_NOTIMP;
745 }
746 kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
747 if (!kdb_macro)
748 goto fail_defcmd;
749
750 mp = &kdb_macro->cmd;
751 mp->func = kdb_exec_defcmd;
752 mp->minlen = 0;
753 mp->flags = KDB_ENABLE_ALWAYS_SAFE;
754 mp->name = kdb_strdup(argv[1], GFP_KDB);
755 if (!mp->name)
756 goto fail_name;
757 mp->usage = kdb_strdup(argv[2], GFP_KDB);
758 if (!mp->usage)
759 goto fail_usage;
760 mp->help = kdb_strdup(argv[3], GFP_KDB);
761 if (!mp->help)
762 goto fail_help;
763 if (mp->usage[0] == '"') {
764 strcpy(mp->usage, argv[2]+1);
765 mp->usage[strlen(mp->usage)-1] = '\0';
766 }
767 if (mp->help[0] == '"') {
768 strcpy(mp->help, argv[3]+1);
769 mp->help[strlen(mp->help)-1] = '\0';
770 }
771
772 INIT_LIST_HEAD(&kdb_macro->statements);
773 defcmd_in_progress = true;
774 return 0;
775fail_help:
776 kfree(mp->usage);
777fail_usage:
778 kfree(mp->name);
779fail_name:
780 kfree(kdb_macro);
781fail_defcmd:
782 kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
783 return KDB_NOTIMP;
784}
785
786/*
787 * kdb_exec_defcmd - Execute the set of commands associated with this
788 * defcmd name.
789 * Inputs:
790 * argc argument count
791 * argv argument vector
792 * Returns:
793 * zero for success, a kdb diagnostic if error
794 */
795static int kdb_exec_defcmd(int argc, const char **argv)
796{
797 int ret;
798 kdbtab_t *kp;
799 struct kdb_macro *kmp;
800 struct kdb_macro_statement *kms;
801
802 if (argc != 0)
803 return KDB_ARGCOUNT;
804
805 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
806 if (strcmp(kp->name, argv[0]) == 0)
807 break;
808 }
809 if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
810 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
811 argv[0]);
812 return KDB_NOTIMP;
813 }
814 kmp = container_of(kp, struct kdb_macro, cmd);
815 list_for_each_entry(kms, &kmp->statements, list_node) {
816 /*
817 * Recursive use of kdb_parse, do not use argv after this point.
818 */
819 argv = NULL;
820 kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
821 ret = kdb_parse(kms->statement);
822 if (ret)
823 return ret;
824 }
825 return 0;
826}
827
828/* Command history */
829#define KDB_CMD_HISTORY_COUNT 32
830#define CMD_BUFLEN 200 /* kdb_printf: max printline
831 * size == 256 */
832static unsigned int cmd_head, cmd_tail;
833static unsigned int cmdptr;
834static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
835static char cmd_cur[CMD_BUFLEN];
836
837/*
838 * The "str" argument may point to something like | grep xyz
839 */
840static void parse_grep(const char *str)
841{
842 int len;
843 char *cp = (char *)str, *cp2;
844
845 /* sanity check: we should have been called with the \ first */
846 if (*cp != '|')
847 return;
848 cp++;
849 while (isspace(*cp))
850 cp++;
851 if (!str_has_prefix(cp, "grep ")) {
852 kdb_printf("invalid 'pipe', see grephelp\n");
853 return;
854 }
855 cp += 5;
856 while (isspace(*cp))
857 cp++;
858 cp2 = strchr(cp, '\n');
859 if (cp2)
860 *cp2 = '\0'; /* remove the trailing newline */
861 len = strlen(cp);
862 if (len == 0) {
863 kdb_printf("invalid 'pipe', see grephelp\n");
864 return;
865 }
866 /* now cp points to a nonzero length search string */
867 if (*cp == '"') {
868 /* allow it be "x y z" by removing the "'s - there must
869 be two of them */
870 cp++;
871 cp2 = strchr(cp, '"');
872 if (!cp2) {
873 kdb_printf("invalid quoted string, see grephelp\n");
874 return;
875 }
876 *cp2 = '\0'; /* end the string where the 2nd " was */
877 }
878 kdb_grep_leading = 0;
879 if (*cp == '^') {
880 kdb_grep_leading = 1;
881 cp++;
882 }
883 len = strlen(cp);
884 kdb_grep_trailing = 0;
885 if (*(cp+len-1) == '$') {
886 kdb_grep_trailing = 1;
887 *(cp+len-1) = '\0';
888 }
889 len = strlen(cp);
890 if (!len)
891 return;
892 if (len >= KDB_GREP_STRLEN) {
893 kdb_printf("search string too long\n");
894 return;
895 }
896 strcpy(kdb_grep_string, cp);
897 kdb_grepping_flag++;
898 return;
899}
900
901/*
902 * kdb_parse - Parse the command line, search the command table for a
903 * matching command and invoke the command function. This
904 * function may be called recursively, if it is, the second call
905 * will overwrite argv and cbuf. It is the caller's
906 * responsibility to save their argv if they recursively call
907 * kdb_parse().
908 * Parameters:
909 * cmdstr The input command line to be parsed.
910 * regs The registers at the time kdb was entered.
911 * Returns:
912 * Zero for success, a kdb diagnostic if failure.
913 * Remarks:
914 * Limited to 20 tokens.
915 *
916 * Real rudimentary tokenization. Basically only whitespace
917 * is considered a token delimiter (but special consideration
918 * is taken of the '=' sign as used by the 'set' command).
919 *
920 * The algorithm used to tokenize the input string relies on
921 * there being at least one whitespace (or otherwise useless)
922 * character between tokens as the character immediately following
923 * the token is altered in-place to a null-byte to terminate the
924 * token string.
925 */
926
927#define MAXARGC 20
928
929int kdb_parse(const char *cmdstr)
930{
931 static char *argv[MAXARGC];
932 static int argc;
933 static char cbuf[CMD_BUFLEN+2];
934 char *cp;
935 char *cpp, quoted;
936 kdbtab_t *tp;
937 int escaped, ignore_errors = 0, check_grep = 0;
938
939 /*
940 * First tokenize the command string.
941 */
942 cp = (char *)cmdstr;
943
944 if (KDB_FLAG(CMD_INTERRUPT)) {
945 /* Previous command was interrupted, newline must not
946 * repeat the command */
947 KDB_FLAG_CLEAR(CMD_INTERRUPT);
948 KDB_STATE_SET(PAGER);
949 argc = 0; /* no repeat */
950 }
951
952 if (*cp != '\n' && *cp != '\0') {
953 argc = 0;
954 cpp = cbuf;
955 while (*cp) {
956 /* skip whitespace */
957 while (isspace(*cp))
958 cp++;
959 if ((*cp == '\0') || (*cp == '\n') ||
960 (*cp == '#' && !defcmd_in_progress))
961 break;
962 /* special case: check for | grep pattern */
963 if (*cp == '|') {
964 check_grep++;
965 break;
966 }
967 if (cpp >= cbuf + CMD_BUFLEN) {
968 kdb_printf("kdb_parse: command buffer "
969 "overflow, command ignored\n%s\n",
970 cmdstr);
971 return KDB_NOTFOUND;
972 }
973 if (argc >= MAXARGC - 1) {
974 kdb_printf("kdb_parse: too many arguments, "
975 "command ignored\n%s\n", cmdstr);
976 return KDB_NOTFOUND;
977 }
978 argv[argc++] = cpp;
979 escaped = 0;
980 quoted = '\0';
981 /* Copy to next unquoted and unescaped
982 * whitespace or '=' */
983 while (*cp && *cp != '\n' &&
984 (escaped || quoted || !isspace(*cp))) {
985 if (cpp >= cbuf + CMD_BUFLEN)
986 break;
987 if (escaped) {
988 escaped = 0;
989 *cpp++ = *cp++;
990 continue;
991 }
992 if (*cp == '\\') {
993 escaped = 1;
994 ++cp;
995 continue;
996 }
997 if (*cp == quoted)
998 quoted = '\0';
999 else if (*cp == '\'' || *cp == '"')
1000 quoted = *cp;
1001 *cpp = *cp++;
1002 if (*cpp == '=' && !quoted)
1003 break;
1004 ++cpp;
1005 }
1006 *cpp++ = '\0'; /* Squash a ws or '=' character */
1007 }
1008 }
1009 if (!argc)
1010 return 0;
1011 if (check_grep)
1012 parse_grep(cp);
1013 if (defcmd_in_progress) {
1014 int result = kdb_defcmd2(cmdstr, argv[0]);
1015 if (!defcmd_in_progress) {
1016 argc = 0; /* avoid repeat on endefcmd */
1017 *(argv[0]) = '\0';
1018 }
1019 return result;
1020 }
1021 if (argv[0][0] == '-' && argv[0][1] &&
1022 (argv[0][1] < '0' || argv[0][1] > '9')) {
1023 ignore_errors = 1;
1024 ++argv[0];
1025 }
1026
1027 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1028 /*
1029 * If this command is allowed to be abbreviated,
1030 * check to see if this is it.
1031 */
1032 if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
1033 (strncmp(argv[0], tp->name, tp->minlen) == 0))
1034 break;
1035
1036 if (strcmp(argv[0], tp->name) == 0)
1037 break;
1038 }
1039
1040 /*
1041 * If we don't find a command by this name, see if the first
1042 * few characters of this match any of the known commands.
1043 * e.g., md1c20 should match md.
1044 */
1045 if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1046 list_for_each_entry(tp, &kdb_cmds_head, list_node) {
1047 if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
1048 break;
1049 }
1050 }
1051
1052 if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
1053 int result;
1054
1055 if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
1056 return KDB_NOPERM;
1057
1058 KDB_STATE_SET(CMD);
1059 result = (*tp->func)(argc-1, (const char **)argv);
1060 if (result && ignore_errors && result > KDB_CMD_GO)
1061 result = 0;
1062 KDB_STATE_CLEAR(CMD);
1063
1064 if (tp->flags & KDB_REPEAT_WITH_ARGS)
1065 return result;
1066
1067 argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1068 if (argv[argc])
1069 *(argv[argc]) = '\0';
1070 return result;
1071 }
1072
1073 /*
1074 * If the input with which we were presented does not
1075 * map to an existing command, attempt to parse it as an
1076 * address argument and display the result. Useful for
1077 * obtaining the address of a variable, or the nearest symbol
1078 * to an address contained in a register.
1079 */
1080 {
1081 unsigned long value;
1082 char *name = NULL;
1083 long offset;
1084 int nextarg = 0;
1085
1086 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1087 &value, &offset, &name)) {
1088 return KDB_NOTFOUND;
1089 }
1090
1091 kdb_printf("%s = ", argv[0]);
1092 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1093 kdb_printf("\n");
1094 return 0;
1095 }
1096}
1097
1098
1099static int handle_ctrl_cmd(char *cmd)
1100{
1101#define CTRL_P 16
1102#define CTRL_N 14
1103
1104 /* initial situation */
1105 if (cmd_head == cmd_tail)
1106 return 0;
1107 switch (*cmd) {
1108 case CTRL_P:
1109 if (cmdptr != cmd_tail)
1110 cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
1111 KDB_CMD_HISTORY_COUNT;
1112 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1113 return 1;
1114 case CTRL_N:
1115 if (cmdptr != cmd_head)
1116 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1117 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1118 return 1;
1119 }
1120 return 0;
1121}
1122
1123/*
1124 * kdb_reboot - This function implements the 'reboot' command. Reboot
1125 * the system immediately, or loop for ever on failure.
1126 */
1127static int kdb_reboot(int argc, const char **argv)
1128{
1129 emergency_restart();
1130 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1131 while (1)
1132 cpu_relax();
1133 /* NOTREACHED */
1134 return 0;
1135}
1136
1137static void kdb_dumpregs(struct pt_regs *regs)
1138{
1139 int old_lvl = console_loglevel;
1140 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1141 kdb_trap_printk++;
1142 show_regs(regs);
1143 kdb_trap_printk--;
1144 kdb_printf("\n");
1145 console_loglevel = old_lvl;
1146}
1147
1148static void kdb_set_current_task(struct task_struct *p)
1149{
1150 kdb_current_task = p;
1151
1152 if (kdb_task_has_cpu(p)) {
1153 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1154 return;
1155 }
1156 kdb_current_regs = NULL;
1157}
1158
1159static void drop_newline(char *buf)
1160{
1161 size_t len = strlen(buf);
1162
1163 if (len == 0)
1164 return;
1165 if (*(buf + len - 1) == '\n')
1166 *(buf + len - 1) = '\0';
1167}
1168
1169/*
1170 * kdb_local - The main code for kdb. This routine is invoked on a
1171 * specific processor, it is not global. The main kdb() routine
1172 * ensures that only one processor at a time is in this routine.
1173 * This code is called with the real reason code on the first
1174 * entry to a kdb session, thereafter it is called with reason
1175 * SWITCH, even if the user goes back to the original cpu.
1176 * Inputs:
1177 * reason The reason KDB was invoked
1178 * error The hardware-defined error code
1179 * regs The exception frame at time of fault/breakpoint.
1180 * db_result Result code from the break or debug point.
1181 * Returns:
1182 * 0 KDB was invoked for an event which it wasn't responsible
1183 * 1 KDB handled the event for which it was invoked.
1184 * KDB_CMD_GO User typed 'go'.
1185 * KDB_CMD_CPU User switched to another cpu.
1186 * KDB_CMD_SS Single step.
1187 */
1188static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1189 kdb_dbtrap_t db_result)
1190{
1191 char *cmdbuf;
1192 int diag;
1193 struct task_struct *kdb_current =
1194 curr_task(raw_smp_processor_id());
1195
1196 KDB_DEBUG_STATE("kdb_local 1", reason);
1197
1198 kdb_check_for_lockdown();
1199
1200 kdb_go_count = 0;
1201 if (reason == KDB_REASON_DEBUG) {
1202 /* special case below */
1203 } else {
1204 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1205 kdb_current, kdb_current ? kdb_current->pid : 0);
1206#if defined(CONFIG_SMP)
1207 kdb_printf("on processor %d ", raw_smp_processor_id());
1208#endif
1209 }
1210
1211 switch (reason) {
1212 case KDB_REASON_DEBUG:
1213 {
1214 /*
1215 * If re-entering kdb after a single step
1216 * command, don't print the message.
1217 */
1218 switch (db_result) {
1219 case KDB_DB_BPT:
1220 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1221 kdb_current, kdb_current->pid);
1222#if defined(CONFIG_SMP)
1223 kdb_printf("on processor %d ", raw_smp_processor_id());
1224#endif
1225 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1226 instruction_pointer(regs));
1227 break;
1228 case KDB_DB_SS:
1229 break;
1230 case KDB_DB_SSBPT:
1231 KDB_DEBUG_STATE("kdb_local 4", reason);
1232 return 1; /* kdba_db_trap did the work */
1233 default:
1234 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1235 db_result);
1236 break;
1237 }
1238
1239 }
1240 break;
1241 case KDB_REASON_ENTER:
1242 if (KDB_STATE(KEYBOARD))
1243 kdb_printf("due to Keyboard Entry\n");
1244 else
1245 kdb_printf("due to KDB_ENTER()\n");
1246 break;
1247 case KDB_REASON_KEYBOARD:
1248 KDB_STATE_SET(KEYBOARD);
1249 kdb_printf("due to Keyboard Entry\n");
1250 break;
1251 case KDB_REASON_ENTER_SLAVE:
1252 /* drop through, slaves only get released via cpu switch */
1253 case KDB_REASON_SWITCH:
1254 kdb_printf("due to cpu switch\n");
1255 break;
1256 case KDB_REASON_OOPS:
1257 kdb_printf("Oops: %s\n", kdb_diemsg);
1258 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1259 instruction_pointer(regs));
1260 kdb_dumpregs(regs);
1261 break;
1262 case KDB_REASON_SYSTEM_NMI:
1263 kdb_printf("due to System NonMaskable Interrupt\n");
1264 break;
1265 case KDB_REASON_NMI:
1266 kdb_printf("due to NonMaskable Interrupt @ "
1267 kdb_machreg_fmt "\n",
1268 instruction_pointer(regs));
1269 break;
1270 case KDB_REASON_SSTEP:
1271 case KDB_REASON_BREAK:
1272 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1273 reason == KDB_REASON_BREAK ?
1274 "Breakpoint" : "SS trap", instruction_pointer(regs));
1275 /*
1276 * Determine if this breakpoint is one that we
1277 * are interested in.
1278 */
1279 if (db_result != KDB_DB_BPT) {
1280 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1281 db_result);
1282 KDB_DEBUG_STATE("kdb_local 6", reason);
1283 return 0; /* Not for us, dismiss it */
1284 }
1285 break;
1286 case KDB_REASON_RECURSE:
1287 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1288 instruction_pointer(regs));
1289 break;
1290 default:
1291 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1292 KDB_DEBUG_STATE("kdb_local 8", reason);
1293 return 0; /* Not for us, dismiss it */
1294 }
1295
1296 while (1) {
1297 /*
1298 * Initialize pager context.
1299 */
1300 kdb_nextline = 1;
1301 KDB_STATE_CLEAR(SUPPRESS);
1302 kdb_grepping_flag = 0;
1303 /* ensure the old search does not leak into '/' commands */
1304 kdb_grep_string[0] = '\0';
1305
1306 cmdbuf = cmd_cur;
1307 *cmdbuf = '\0';
1308 *(cmd_hist[cmd_head]) = '\0';
1309
1310do_full_getstr:
1311 /* PROMPT can only be set if we have MEM_READ permission. */
1312 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1313 raw_smp_processor_id());
1314
1315 /*
1316 * Fetch command from keyboard
1317 */
1318 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1319 if (*cmdbuf != '\n') {
1320 if (*cmdbuf < 32) {
1321 if (cmdptr == cmd_head) {
1322 strscpy(cmd_hist[cmd_head], cmd_cur,
1323 CMD_BUFLEN);
1324 *(cmd_hist[cmd_head] +
1325 strlen(cmd_hist[cmd_head])-1) = '\0';
1326 }
1327 if (!handle_ctrl_cmd(cmdbuf))
1328 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1329 cmdbuf = cmd_cur;
1330 goto do_full_getstr;
1331 } else {
1332 strscpy(cmd_hist[cmd_head], cmd_cur,
1333 CMD_BUFLEN);
1334 }
1335
1336 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1337 if (cmd_head == cmd_tail)
1338 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1339 }
1340
1341 cmdptr = cmd_head;
1342 diag = kdb_parse(cmdbuf);
1343 if (diag == KDB_NOTFOUND) {
1344 drop_newline(cmdbuf);
1345 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1346 diag = 0;
1347 }
1348 if (diag == KDB_CMD_GO
1349 || diag == KDB_CMD_CPU
1350 || diag == KDB_CMD_SS
1351 || diag == KDB_CMD_KGDB)
1352 break;
1353
1354 if (diag)
1355 kdb_cmderror(diag);
1356 }
1357 KDB_DEBUG_STATE("kdb_local 9", diag);
1358 return diag;
1359}
1360
1361
1362/*
1363 * kdb_print_state - Print the state data for the current processor
1364 * for debugging.
1365 * Inputs:
1366 * text Identifies the debug point
1367 * value Any integer value to be printed, e.g. reason code.
1368 */
1369void kdb_print_state(const char *text, int value)
1370{
1371 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1372 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1373 kdb_state);
1374}
1375
1376/*
1377 * kdb_main_loop - After initial setup and assignment of the
1378 * controlling cpu, all cpus are in this loop. One cpu is in
1379 * control and will issue the kdb prompt, the others will spin
1380 * until 'go' or cpu switch.
1381 *
1382 * To get a consistent view of the kernel stacks for all
1383 * processes, this routine is invoked from the main kdb code via
1384 * an architecture specific routine. kdba_main_loop is
1385 * responsible for making the kernel stacks consistent for all
1386 * processes, there should be no difference between a blocked
1387 * process and a running process as far as kdb is concerned.
1388 * Inputs:
1389 * reason The reason KDB was invoked
1390 * error The hardware-defined error code
1391 * reason2 kdb's current reason code.
1392 * Initially error but can change
1393 * according to kdb state.
1394 * db_result Result code from break or debug point.
1395 * regs The exception frame at time of fault/breakpoint.
1396 * should always be valid.
1397 * Returns:
1398 * 0 KDB was invoked for an event which it wasn't responsible
1399 * 1 KDB handled the event for which it was invoked.
1400 */
1401int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1402 kdb_dbtrap_t db_result, struct pt_regs *regs)
1403{
1404 int result = 1;
1405 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1406 while (1) {
1407 /*
1408 * All processors except the one that is in control
1409 * will spin here.
1410 */
1411 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1412 while (KDB_STATE(HOLD_CPU)) {
1413 /* state KDB is turned off by kdb_cpu to see if the
1414 * other cpus are still live, each cpu in this loop
1415 * turns it back on.
1416 */
1417 if (!KDB_STATE(KDB))
1418 KDB_STATE_SET(KDB);
1419 }
1420
1421 KDB_STATE_CLEAR(SUPPRESS);
1422 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1423 if (KDB_STATE(LEAVING))
1424 break; /* Another cpu said 'go' */
1425 /* Still using kdb, this processor is in control */
1426 result = kdb_local(reason2, error, regs, db_result);
1427 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1428
1429 if (result == KDB_CMD_CPU)
1430 break;
1431
1432 if (result == KDB_CMD_SS) {
1433 KDB_STATE_SET(DOING_SS);
1434 break;
1435 }
1436
1437 if (result == KDB_CMD_KGDB) {
1438 if (!KDB_STATE(DOING_KGDB))
1439 kdb_printf("Entering please attach debugger "
1440 "or use $D#44+ or $3#33\n");
1441 break;
1442 }
1443 if (result && result != 1 && result != KDB_CMD_GO)
1444 kdb_printf("\nUnexpected kdb_local return code %d\n",
1445 result);
1446 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1447 break;
1448 }
1449 if (KDB_STATE(DOING_SS))
1450 KDB_STATE_CLEAR(SSBPT);
1451
1452 /* Clean up any keyboard devices before leaving */
1453 kdb_kbd_cleanup_state();
1454
1455 return result;
1456}
1457
1458/*
1459 * kdb_mdr - This function implements the guts of the 'mdr', memory
1460 * read command.
1461 * mdr <addr arg>,<byte count>
1462 * Inputs:
1463 * addr Start address
1464 * count Number of bytes
1465 * Returns:
1466 * Always 0. Any errors are detected and printed by kdb_getarea.
1467 */
1468static int kdb_mdr(unsigned long addr, unsigned int count)
1469{
1470 unsigned char c;
1471 while (count--) {
1472 if (kdb_getarea(c, addr))
1473 return 0;
1474 kdb_printf("%02x", c);
1475 addr++;
1476 }
1477 kdb_printf("\n");
1478 return 0;
1479}
1480
1481/*
1482 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1483 * 'md8' 'mdr' and 'mds' commands.
1484 *
1485 * md|mds [<addr arg> [<line count> [<radix>]]]
1486 * mdWcN [<addr arg> [<line count> [<radix>]]]
1487 * where W = is the width (1, 2, 4 or 8) and N is the count.
1488 * for eg., md1c20 reads 20 bytes, 1 at a time.
1489 * mdr <addr arg>,<byte count>
1490 */
1491static void kdb_md_line(const char *fmtstr, unsigned long addr,
1492 int symbolic, int nosect, int bytesperword,
1493 int num, int repeat, int phys)
1494{
1495 /* print just one line of data */
1496 kdb_symtab_t symtab;
1497 char cbuf[32];
1498 char *c = cbuf;
1499 int i;
1500 int j;
1501 unsigned long word;
1502
1503 memset(cbuf, '\0', sizeof(cbuf));
1504 if (phys)
1505 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1506 else
1507 kdb_printf(kdb_machreg_fmt0 " ", addr);
1508
1509 for (i = 0; i < num && repeat--; i++) {
1510 if (phys) {
1511 if (kdb_getphysword(&word, addr, bytesperword))
1512 break;
1513 } else if (kdb_getword(&word, addr, bytesperword))
1514 break;
1515 kdb_printf(fmtstr, word);
1516 if (symbolic)
1517 kdbnearsym(word, &symtab);
1518 else
1519 memset(&symtab, 0, sizeof(symtab));
1520 if (symtab.sym_name) {
1521 kdb_symbol_print(word, &symtab, 0);
1522 if (!nosect) {
1523 kdb_printf("\n");
1524 kdb_printf(" %s %s "
1525 kdb_machreg_fmt " "
1526 kdb_machreg_fmt " "
1527 kdb_machreg_fmt, symtab.mod_name,
1528 symtab.sec_name, symtab.sec_start,
1529 symtab.sym_start, symtab.sym_end);
1530 }
1531 addr += bytesperword;
1532 } else {
1533 union {
1534 u64 word;
1535 unsigned char c[8];
1536 } wc;
1537 unsigned char *cp;
1538#ifdef __BIG_ENDIAN
1539 cp = wc.c + 8 - bytesperword;
1540#else
1541 cp = wc.c;
1542#endif
1543 wc.word = word;
1544#define printable_char(c) \
1545 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1546 for (j = 0; j < bytesperword; j++)
1547 *c++ = printable_char(*cp++);
1548 addr += bytesperword;
1549#undef printable_char
1550 }
1551 }
1552 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1553 " ", cbuf);
1554}
1555
1556static int kdb_md(int argc, const char **argv)
1557{
1558 static unsigned long last_addr;
1559 static int last_radix, last_bytesperword, last_repeat;
1560 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1561 int nosect = 0;
1562 char fmtchar, fmtstr[64];
1563 unsigned long addr;
1564 unsigned long word;
1565 long offset = 0;
1566 int symbolic = 0;
1567 int valid = 0;
1568 int phys = 0;
1569 int raw = 0;
1570
1571 kdbgetintenv("MDCOUNT", &mdcount);
1572 kdbgetintenv("RADIX", &radix);
1573 kdbgetintenv("BYTESPERWORD", &bytesperword);
1574
1575 /* Assume 'md <addr>' and start with environment values */
1576 repeat = mdcount * 16 / bytesperword;
1577
1578 if (strcmp(argv[0], "mdr") == 0) {
1579 if (argc == 2 || (argc == 0 && last_addr != 0))
1580 valid = raw = 1;
1581 else
1582 return KDB_ARGCOUNT;
1583 } else if (isdigit(argv[0][2])) {
1584 bytesperword = (int)(argv[0][2] - '0');
1585 if (bytesperword == 0) {
1586 bytesperword = last_bytesperword;
1587 if (bytesperword == 0)
1588 bytesperword = 4;
1589 }
1590 last_bytesperword = bytesperword;
1591 repeat = mdcount * 16 / bytesperword;
1592 if (!argv[0][3])
1593 valid = 1;
1594 else if (argv[0][3] == 'c' && argv[0][4]) {
1595 if (kstrtouint(argv[0] + 4, 10, &repeat))
1596 return KDB_BADINT;
1597 mdcount = ((repeat * bytesperword) + 15) / 16;
1598 valid = 1;
1599 }
1600 last_repeat = repeat;
1601 } else if (strcmp(argv[0], "md") == 0)
1602 valid = 1;
1603 else if (strcmp(argv[0], "mds") == 0)
1604 valid = 1;
1605 else if (strcmp(argv[0], "mdp") == 0) {
1606 phys = valid = 1;
1607 }
1608 if (!valid)
1609 return KDB_NOTFOUND;
1610
1611 if (argc == 0) {
1612 if (last_addr == 0)
1613 return KDB_ARGCOUNT;
1614 addr = last_addr;
1615 radix = last_radix;
1616 bytesperword = last_bytesperword;
1617 repeat = last_repeat;
1618 if (raw)
1619 mdcount = repeat;
1620 else
1621 mdcount = ((repeat * bytesperword) + 15) / 16;
1622 }
1623
1624 if (argc) {
1625 unsigned long val;
1626 int diag, nextarg = 1;
1627 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1628 &offset, NULL);
1629 if (diag)
1630 return diag;
1631 if (argc > nextarg+2)
1632 return KDB_ARGCOUNT;
1633
1634 if (argc >= nextarg) {
1635 diag = kdbgetularg(argv[nextarg], &val);
1636 if (!diag) {
1637 mdcount = (int) val;
1638 if (raw)
1639 repeat = mdcount;
1640 else
1641 repeat = mdcount * 16 / bytesperword;
1642 }
1643 }
1644 if (argc >= nextarg+1) {
1645 diag = kdbgetularg(argv[nextarg+1], &val);
1646 if (!diag)
1647 radix = (int) val;
1648 }
1649 }
1650
1651 if (strcmp(argv[0], "mdr") == 0) {
1652 int ret;
1653 last_addr = addr;
1654 ret = kdb_mdr(addr, mdcount);
1655 last_addr += mdcount;
1656 last_repeat = mdcount;
1657 last_bytesperword = bytesperword; // to make REPEAT happy
1658 return ret;
1659 }
1660
1661 switch (radix) {
1662 case 10:
1663 fmtchar = 'd';
1664 break;
1665 case 16:
1666 fmtchar = 'x';
1667 break;
1668 case 8:
1669 fmtchar = 'o';
1670 break;
1671 default:
1672 return KDB_BADRADIX;
1673 }
1674
1675 last_radix = radix;
1676
1677 if (bytesperword > KDB_WORD_SIZE)
1678 return KDB_BADWIDTH;
1679
1680 switch (bytesperword) {
1681 case 8:
1682 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1683 break;
1684 case 4:
1685 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1686 break;
1687 case 2:
1688 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1689 break;
1690 case 1:
1691 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1692 break;
1693 default:
1694 return KDB_BADWIDTH;
1695 }
1696
1697 last_repeat = repeat;
1698 last_bytesperword = bytesperword;
1699
1700 if (strcmp(argv[0], "mds") == 0) {
1701 symbolic = 1;
1702 /* Do not save these changes as last_*, they are temporary mds
1703 * overrides.
1704 */
1705 bytesperword = KDB_WORD_SIZE;
1706 repeat = mdcount;
1707 kdbgetintenv("NOSECT", &nosect);
1708 }
1709
1710 /* Round address down modulo BYTESPERWORD */
1711
1712 addr &= ~(bytesperword-1);
1713
1714 while (repeat > 0) {
1715 unsigned long a;
1716 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1717
1718 if (KDB_FLAG(CMD_INTERRUPT))
1719 return 0;
1720 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1721 if (phys) {
1722 if (kdb_getphysword(&word, a, bytesperword)
1723 || word)
1724 break;
1725 } else if (kdb_getword(&word, a, bytesperword) || word)
1726 break;
1727 }
1728 n = min(num, repeat);
1729 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1730 num, repeat, phys);
1731 addr += bytesperword * n;
1732 repeat -= n;
1733 z = (z + num - 1) / num;
1734 if (z > 2) {
1735 int s = num * (z-2);
1736 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1737 " zero suppressed\n",
1738 addr, addr + bytesperword * s - 1);
1739 addr += bytesperword * s;
1740 repeat -= s;
1741 }
1742 }
1743 last_addr = addr;
1744
1745 return 0;
1746}
1747
1748/*
1749 * kdb_mm - This function implements the 'mm' command.
1750 * mm address-expression new-value
1751 * Remarks:
1752 * mm works on machine words, mmW works on bytes.
1753 */
1754static int kdb_mm(int argc, const char **argv)
1755{
1756 int diag;
1757 unsigned long addr;
1758 long offset = 0;
1759 unsigned long contents;
1760 int nextarg;
1761 int width;
1762
1763 if (argv[0][2] && !isdigit(argv[0][2]))
1764 return KDB_NOTFOUND;
1765
1766 if (argc < 2)
1767 return KDB_ARGCOUNT;
1768
1769 nextarg = 1;
1770 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1771 if (diag)
1772 return diag;
1773
1774 if (nextarg > argc)
1775 return KDB_ARGCOUNT;
1776 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1777 if (diag)
1778 return diag;
1779
1780 if (nextarg != argc + 1)
1781 return KDB_ARGCOUNT;
1782
1783 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1784 diag = kdb_putword(addr, contents, width);
1785 if (diag)
1786 return diag;
1787
1788 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1789
1790 return 0;
1791}
1792
1793/*
1794 * kdb_go - This function implements the 'go' command.
1795 * go [address-expression]
1796 */
1797static int kdb_go(int argc, const char **argv)
1798{
1799 unsigned long addr;
1800 int diag;
1801 int nextarg;
1802 long offset;
1803
1804 if (raw_smp_processor_id() != kdb_initial_cpu) {
1805 kdb_printf("go must execute on the entry cpu, "
1806 "please use \"cpu %d\" and then execute go\n",
1807 kdb_initial_cpu);
1808 return KDB_BADCPUNUM;
1809 }
1810 if (argc == 1) {
1811 nextarg = 1;
1812 diag = kdbgetaddrarg(argc, argv, &nextarg,
1813 &addr, &offset, NULL);
1814 if (diag)
1815 return diag;
1816 } else if (argc) {
1817 return KDB_ARGCOUNT;
1818 }
1819
1820 diag = KDB_CMD_GO;
1821 if (KDB_FLAG(CATASTROPHIC)) {
1822 kdb_printf("Catastrophic error detected\n");
1823 kdb_printf("kdb_continue_catastrophic=%d, ",
1824 kdb_continue_catastrophic);
1825 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1826 kdb_printf("type go a second time if you really want "
1827 "to continue\n");
1828 return 0;
1829 }
1830 if (kdb_continue_catastrophic == 2) {
1831 kdb_printf("forcing reboot\n");
1832 kdb_reboot(0, NULL);
1833 }
1834 kdb_printf("attempting to continue\n");
1835 }
1836 return diag;
1837}
1838
1839/*
1840 * kdb_rd - This function implements the 'rd' command.
1841 */
1842static int kdb_rd(int argc, const char **argv)
1843{
1844 int len = kdb_check_regs();
1845#if DBG_MAX_REG_NUM > 0
1846 int i;
1847 char *rname;
1848 int rsize;
1849 u64 reg64;
1850 u32 reg32;
1851 u16 reg16;
1852 u8 reg8;
1853
1854 if (len)
1855 return len;
1856
1857 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1858 rsize = dbg_reg_def[i].size * 2;
1859 if (rsize > 16)
1860 rsize = 2;
1861 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1862 len = 0;
1863 kdb_printf("\n");
1864 }
1865 if (len)
1866 len += kdb_printf(" ");
1867 switch(dbg_reg_def[i].size * 8) {
1868 case 8:
1869 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1870 if (!rname)
1871 break;
1872 len += kdb_printf("%s: %02x", rname, reg8);
1873 break;
1874 case 16:
1875 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1876 if (!rname)
1877 break;
1878 len += kdb_printf("%s: %04x", rname, reg16);
1879 break;
1880 case 32:
1881 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1882 if (!rname)
1883 break;
1884 len += kdb_printf("%s: %08x", rname, reg32);
1885 break;
1886 case 64:
1887 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1888 if (!rname)
1889 break;
1890 len += kdb_printf("%s: %016llx", rname, reg64);
1891 break;
1892 default:
1893 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1894 }
1895 }
1896 kdb_printf("\n");
1897#else
1898 if (len)
1899 return len;
1900
1901 kdb_dumpregs(kdb_current_regs);
1902#endif
1903 return 0;
1904}
1905
1906/*
1907 * kdb_rm - This function implements the 'rm' (register modify) command.
1908 * rm register-name new-contents
1909 * Remarks:
1910 * Allows register modification with the same restrictions as gdb
1911 */
1912static int kdb_rm(int argc, const char **argv)
1913{
1914#if DBG_MAX_REG_NUM > 0
1915 int diag;
1916 const char *rname;
1917 int i;
1918 u64 reg64;
1919 u32 reg32;
1920 u16 reg16;
1921 u8 reg8;
1922
1923 if (argc != 2)
1924 return KDB_ARGCOUNT;
1925 /*
1926 * Allow presence or absence of leading '%' symbol.
1927 */
1928 rname = argv[1];
1929 if (*rname == '%')
1930 rname++;
1931
1932 diag = kdbgetu64arg(argv[2], ®64);
1933 if (diag)
1934 return diag;
1935
1936 diag = kdb_check_regs();
1937 if (diag)
1938 return diag;
1939
1940 diag = KDB_BADREG;
1941 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1942 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1943 diag = 0;
1944 break;
1945 }
1946 }
1947 if (!diag) {
1948 switch(dbg_reg_def[i].size * 8) {
1949 case 8:
1950 reg8 = reg64;
1951 dbg_set_reg(i, ®8, kdb_current_regs);
1952 break;
1953 case 16:
1954 reg16 = reg64;
1955 dbg_set_reg(i, ®16, kdb_current_regs);
1956 break;
1957 case 32:
1958 reg32 = reg64;
1959 dbg_set_reg(i, ®32, kdb_current_regs);
1960 break;
1961 case 64:
1962 dbg_set_reg(i, ®64, kdb_current_regs);
1963 break;
1964 }
1965 }
1966 return diag;
1967#else
1968 kdb_printf("ERROR: Register set currently not implemented\n");
1969 return 0;
1970#endif
1971}
1972
1973#if defined(CONFIG_MAGIC_SYSRQ)
1974/*
1975 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1976 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1977 * sr <magic-sysrq-code>
1978 */
1979static int kdb_sr(int argc, const char **argv)
1980{
1981 bool check_mask =
1982 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1983
1984 if (argc != 1)
1985 return KDB_ARGCOUNT;
1986
1987 kdb_trap_printk++;
1988 __handle_sysrq(*argv[1], check_mask);
1989 kdb_trap_printk--;
1990
1991 return 0;
1992}
1993#endif /* CONFIG_MAGIC_SYSRQ */
1994
1995/*
1996 * kdb_ef - This function implements the 'regs' (display exception
1997 * frame) command. This command takes an address and expects to
1998 * find an exception frame at that address, formats and prints
1999 * it.
2000 * regs address-expression
2001 * Remarks:
2002 * Not done yet.
2003 */
2004static int kdb_ef(int argc, const char **argv)
2005{
2006 int diag;
2007 unsigned long addr;
2008 long offset;
2009 int nextarg;
2010
2011 if (argc != 1)
2012 return KDB_ARGCOUNT;
2013
2014 nextarg = 1;
2015 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2016 if (diag)
2017 return diag;
2018 show_regs((struct pt_regs *)addr);
2019 return 0;
2020}
2021
2022/*
2023 * kdb_env - This function implements the 'env' command. Display the
2024 * current environment variables.
2025 */
2026
2027static int kdb_env(int argc, const char **argv)
2028{
2029 kdb_printenv();
2030
2031 if (KDB_DEBUG(MASK))
2032 kdb_printf("KDBDEBUG=0x%x\n",
2033 (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
2034
2035 return 0;
2036}
2037
2038#ifdef CONFIG_PRINTK
2039/*
2040 * kdb_dmesg - This function implements the 'dmesg' command to display
2041 * the contents of the syslog buffer.
2042 * dmesg [lines] [adjust]
2043 */
2044static int kdb_dmesg(int argc, const char **argv)
2045{
2046 int diag;
2047 int logging;
2048 int lines = 0;
2049 int adjust = 0;
2050 int n = 0;
2051 int skip = 0;
2052 struct kmsg_dump_iter iter;
2053 size_t len;
2054 char buf[201];
2055
2056 if (argc > 2)
2057 return KDB_ARGCOUNT;
2058 if (argc) {
2059 if (kstrtoint(argv[1], 0, &lines))
2060 lines = 0;
2061 if (argc > 1 && (kstrtoint(argv[2], 0, &adjust) || adjust < 0))
2062 adjust = 0;
2063 }
2064
2065 /* disable LOGGING if set */
2066 diag = kdbgetintenv("LOGGING", &logging);
2067 if (!diag && logging) {
2068 const char *setargs[] = { "set", "LOGGING", "0" };
2069 kdb_set(2, setargs);
2070 }
2071
2072 kmsg_dump_rewind(&iter);
2073 while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL))
2074 n++;
2075
2076 if (lines < 0) {
2077 if (adjust >= n)
2078 kdb_printf("buffer only contains %d lines, nothing "
2079 "printed\n", n);
2080 else if (adjust - lines >= n)
2081 kdb_printf("buffer only contains %d lines, last %d "
2082 "lines printed\n", n, n - adjust);
2083 skip = adjust;
2084 lines = abs(lines);
2085 } else if (lines > 0) {
2086 skip = n - lines - adjust;
2087 lines = abs(lines);
2088 if (adjust >= n) {
2089 kdb_printf("buffer only contains %d lines, "
2090 "nothing printed\n", n);
2091 skip = n;
2092 } else if (skip < 0) {
2093 lines += skip;
2094 skip = 0;
2095 kdb_printf("buffer only contains %d lines, first "
2096 "%d lines printed\n", n, lines);
2097 }
2098 } else {
2099 lines = n;
2100 }
2101
2102 if (skip >= n || skip < 0)
2103 return 0;
2104
2105 kmsg_dump_rewind(&iter);
2106 while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) {
2107 if (skip) {
2108 skip--;
2109 continue;
2110 }
2111 if (!lines--)
2112 break;
2113 if (KDB_FLAG(CMD_INTERRUPT))
2114 return 0;
2115
2116 kdb_printf("%.*s\n", (int)len - 1, buf);
2117 }
2118
2119 return 0;
2120}
2121#endif /* CONFIG_PRINTK */
2122
2123/* Make sure we balance enable/disable calls, must disable first. */
2124static atomic_t kdb_nmi_disabled;
2125
2126static int kdb_disable_nmi(int argc, const char *argv[])
2127{
2128 if (atomic_read(&kdb_nmi_disabled))
2129 return 0;
2130 atomic_set(&kdb_nmi_disabled, 1);
2131 arch_kgdb_ops.enable_nmi(0);
2132 return 0;
2133}
2134
2135static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2136{
2137 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2138 return -EINVAL;
2139 arch_kgdb_ops.enable_nmi(1);
2140 return 0;
2141}
2142
2143static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2144 .set = kdb_param_enable_nmi,
2145};
2146module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2147
2148/*
2149 * kdb_cpu - This function implements the 'cpu' command.
2150 * cpu [<cpunum>]
2151 * Returns:
2152 * KDB_CMD_CPU for success, a kdb diagnostic if error
2153 */
2154static void kdb_cpu_status(void)
2155{
2156 int i, start_cpu, first_print = 1;
2157 char state, prev_state = '?';
2158
2159 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2160 kdb_printf("Available cpus: ");
2161 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2162 if (!cpu_online(i)) {
2163 state = 'F'; /* cpu is offline */
2164 } else if (!kgdb_info[i].enter_kgdb) {
2165 state = 'D'; /* cpu is online but unresponsive */
2166 } else {
2167 state = ' '; /* cpu is responding to kdb */
2168 if (kdb_task_state_char(KDB_TSK(i)) == '-')
2169 state = '-'; /* idle task */
2170 }
2171 if (state != prev_state) {
2172 if (prev_state != '?') {
2173 if (!first_print)
2174 kdb_printf(", ");
2175 first_print = 0;
2176 kdb_printf("%d", start_cpu);
2177 if (start_cpu < i-1)
2178 kdb_printf("-%d", i-1);
2179 if (prev_state != ' ')
2180 kdb_printf("(%c)", prev_state);
2181 }
2182 prev_state = state;
2183 start_cpu = i;
2184 }
2185 }
2186 /* print the trailing cpus, ignoring them if they are all offline */
2187 if (prev_state != 'F') {
2188 if (!first_print)
2189 kdb_printf(", ");
2190 kdb_printf("%d", start_cpu);
2191 if (start_cpu < i-1)
2192 kdb_printf("-%d", i-1);
2193 if (prev_state != ' ')
2194 kdb_printf("(%c)", prev_state);
2195 }
2196 kdb_printf("\n");
2197}
2198
2199static int kdb_cpu(int argc, const char **argv)
2200{
2201 unsigned long cpunum;
2202 int diag;
2203
2204 if (argc == 0) {
2205 kdb_cpu_status();
2206 return 0;
2207 }
2208
2209 if (argc != 1)
2210 return KDB_ARGCOUNT;
2211
2212 diag = kdbgetularg(argv[1], &cpunum);
2213 if (diag)
2214 return diag;
2215
2216 /*
2217 * Validate cpunum
2218 */
2219 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2220 return KDB_BADCPUNUM;
2221
2222 dbg_switch_cpu = cpunum;
2223
2224 /*
2225 * Switch to other cpu
2226 */
2227 return KDB_CMD_CPU;
2228}
2229
2230/* The user may not realize that ps/bta with no parameters does not print idle
2231 * or sleeping system daemon processes, so tell them how many were suppressed.
2232 */
2233void kdb_ps_suppressed(void)
2234{
2235 int idle = 0, daemon = 0;
2236 unsigned long cpu;
2237 const struct task_struct *p, *g;
2238 for_each_online_cpu(cpu) {
2239 p = curr_task(cpu);
2240 if (kdb_task_state(p, "-"))
2241 ++idle;
2242 }
2243 for_each_process_thread(g, p) {
2244 if (kdb_task_state(p, "ims"))
2245 ++daemon;
2246 }
2247 if (idle || daemon) {
2248 if (idle)
2249 kdb_printf("%d idle process%s (state -)%s\n",
2250 idle, idle == 1 ? "" : "es",
2251 daemon ? " and " : "");
2252 if (daemon)
2253 kdb_printf("%d sleeping system daemon (state [ims]) "
2254 "process%s", daemon,
2255 daemon == 1 ? "" : "es");
2256 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2257 }
2258}
2259
2260void kdb_ps1(const struct task_struct *p)
2261{
2262 int cpu;
2263 unsigned long tmp;
2264
2265 if (!p ||
2266 copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
2267 return;
2268
2269 cpu = kdb_process_cpu(p);
2270 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2271 (void *)p, p->pid, p->parent->pid,
2272 kdb_task_has_cpu(p), kdb_process_cpu(p),
2273 kdb_task_state_char(p),
2274 (void *)(&p->thread),
2275 p == curr_task(raw_smp_processor_id()) ? '*' : ' ',
2276 p->comm);
2277 if (kdb_task_has_cpu(p)) {
2278 if (!KDB_TSK(cpu)) {
2279 kdb_printf(" Error: no saved data for this cpu\n");
2280 } else {
2281 if (KDB_TSK(cpu) != p)
2282 kdb_printf(" Error: does not match running "
2283 "process table (0x%px)\n", KDB_TSK(cpu));
2284 }
2285 }
2286}
2287
2288/*
2289 * kdb_ps - This function implements the 'ps' command which shows a
2290 * list of the active processes.
2291 *
2292 * ps [<state_chars>] Show processes, optionally selecting only those whose
2293 * state character is found in <state_chars>.
2294 */
2295static int kdb_ps(int argc, const char **argv)
2296{
2297 struct task_struct *g, *p;
2298 const char *mask;
2299 unsigned long cpu;
2300
2301 if (argc == 0)
2302 kdb_ps_suppressed();
2303 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2304 (int)(2*sizeof(void *))+2, "Task Addr",
2305 (int)(2*sizeof(void *))+2, "Thread");
2306 mask = argc ? argv[1] : kdbgetenv("PS");
2307 /* Run the active tasks first */
2308 for_each_online_cpu(cpu) {
2309 if (KDB_FLAG(CMD_INTERRUPT))
2310 return 0;
2311 p = curr_task(cpu);
2312 if (kdb_task_state(p, mask))
2313 kdb_ps1(p);
2314 }
2315 kdb_printf("\n");
2316 /* Now the real tasks */
2317 for_each_process_thread(g, p) {
2318 if (KDB_FLAG(CMD_INTERRUPT))
2319 return 0;
2320 if (kdb_task_state(p, mask))
2321 kdb_ps1(p);
2322 }
2323
2324 return 0;
2325}
2326
2327/*
2328 * kdb_pid - This function implements the 'pid' command which switches
2329 * the currently active process.
2330 * pid [<pid> | R]
2331 */
2332static int kdb_pid(int argc, const char **argv)
2333{
2334 struct task_struct *p;
2335 unsigned long val;
2336 int diag;
2337
2338 if (argc > 1)
2339 return KDB_ARGCOUNT;
2340
2341 if (argc) {
2342 if (strcmp(argv[1], "R") == 0) {
2343 p = KDB_TSK(kdb_initial_cpu);
2344 } else {
2345 diag = kdbgetularg(argv[1], &val);
2346 if (diag)
2347 return KDB_BADINT;
2348
2349 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2350 if (!p) {
2351 kdb_printf("No task with pid=%d\n", (pid_t)val);
2352 return 0;
2353 }
2354 }
2355 kdb_set_current_task(p);
2356 }
2357 kdb_printf("KDB current process is %s(pid=%d)\n",
2358 kdb_current_task->comm,
2359 kdb_current_task->pid);
2360
2361 return 0;
2362}
2363
2364static int kdb_kgdb(int argc, const char **argv)
2365{
2366 return KDB_CMD_KGDB;
2367}
2368
2369/*
2370 * kdb_help - This function implements the 'help' and '?' commands.
2371 */
2372static int kdb_help(int argc, const char **argv)
2373{
2374 kdbtab_t *kt;
2375
2376 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2377 kdb_printf("-----------------------------"
2378 "-----------------------------\n");
2379 list_for_each_entry(kt, &kdb_cmds_head, list_node) {
2380 char *space = "";
2381 if (KDB_FLAG(CMD_INTERRUPT))
2382 return 0;
2383 if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
2384 continue;
2385 if (strlen(kt->usage) > 20)
2386 space = "\n ";
2387 kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
2388 kt->usage, space, kt->help);
2389 }
2390 return 0;
2391}
2392
2393/*
2394 * kdb_kill - This function implements the 'kill' commands.
2395 */
2396static int kdb_kill(int argc, const char **argv)
2397{
2398 long sig, pid;
2399 struct task_struct *p;
2400
2401 if (argc != 2)
2402 return KDB_ARGCOUNT;
2403
2404 if (kstrtol(argv[1], 0, &sig))
2405 return KDB_BADINT;
2406 if ((sig >= 0) || !valid_signal(-sig)) {
2407 kdb_printf("Invalid signal parameter.<-signal>\n");
2408 return 0;
2409 }
2410 sig = -sig;
2411
2412 if (kstrtol(argv[2], 0, &pid))
2413 return KDB_BADINT;
2414 if (pid <= 0) {
2415 kdb_printf("Process ID must be large than 0.\n");
2416 return 0;
2417 }
2418
2419 /* Find the process. */
2420 p = find_task_by_pid_ns(pid, &init_pid_ns);
2421 if (!p) {
2422 kdb_printf("The specified process isn't found.\n");
2423 return 0;
2424 }
2425 p = p->group_leader;
2426 kdb_send_sig(p, sig);
2427 return 0;
2428}
2429
2430/*
2431 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2432 * I cannot call that code directly from kdb, it has an unconditional
2433 * cli()/sti() and calls routines that take locks which can stop the debugger.
2434 */
2435static void kdb_sysinfo(struct sysinfo *val)
2436{
2437 u64 uptime = ktime_get_mono_fast_ns();
2438
2439 memset(val, 0, sizeof(*val));
2440 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2441 val->loads[0] = avenrun[0];
2442 val->loads[1] = avenrun[1];
2443 val->loads[2] = avenrun[2];
2444 val->procs = nr_threads-1;
2445 si_meminfo(val);
2446
2447 return;
2448}
2449
2450/*
2451 * kdb_summary - This function implements the 'summary' command.
2452 */
2453static int kdb_summary(int argc, const char **argv)
2454{
2455 time64_t now;
2456 struct sysinfo val;
2457
2458 if (argc)
2459 return KDB_ARGCOUNT;
2460
2461 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2462 kdb_printf("release %s\n", init_uts_ns.name.release);
2463 kdb_printf("version %s\n", init_uts_ns.name.version);
2464 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2465 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2466 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2467
2468 now = __ktime_get_real_seconds();
2469 kdb_printf("date %ptTs tz_minuteswest %d\n", &now, sys_tz.tz_minuteswest);
2470 kdb_sysinfo(&val);
2471 kdb_printf("uptime ");
2472 if (val.uptime > (24*60*60)) {
2473 int days = val.uptime / (24*60*60);
2474 val.uptime %= (24*60*60);
2475 kdb_printf("%d day%s ", days, str_plural(days));
2476 }
2477 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2478
2479 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2480 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2481 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2482 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2483
2484 /* Display in kilobytes */
2485#define K(x) ((x) << (PAGE_SHIFT - 10))
2486 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2487 "Buffers: %8lu kB\n",
2488 K(val.totalram), K(val.freeram), K(val.bufferram));
2489 return 0;
2490}
2491
2492/*
2493 * kdb_per_cpu - This function implements the 'per_cpu' command.
2494 */
2495static int kdb_per_cpu(int argc, const char **argv)
2496{
2497 char fmtstr[64];
2498 int cpu, diag, nextarg = 1;
2499 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2500
2501 if (argc < 1 || argc > 3)
2502 return KDB_ARGCOUNT;
2503
2504 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2505 if (diag)
2506 return diag;
2507
2508 if (argc >= 2) {
2509 diag = kdbgetularg(argv[2], &bytesperword);
2510 if (diag)
2511 return diag;
2512 }
2513 if (!bytesperword)
2514 bytesperword = KDB_WORD_SIZE;
2515 else if (bytesperword > KDB_WORD_SIZE)
2516 return KDB_BADWIDTH;
2517 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2518 if (argc >= 3) {
2519 diag = kdbgetularg(argv[3], &whichcpu);
2520 if (diag)
2521 return diag;
2522 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2523 kdb_printf("cpu %ld is not online\n", whichcpu);
2524 return KDB_BADCPUNUM;
2525 }
2526 }
2527
2528 /* Most architectures use __per_cpu_offset[cpu], some use
2529 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2530 */
2531#ifdef __per_cpu_offset
2532#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2533#else
2534#ifdef CONFIG_SMP
2535#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2536#else
2537#define KDB_PCU(cpu) 0
2538#endif
2539#endif
2540 for_each_online_cpu(cpu) {
2541 if (KDB_FLAG(CMD_INTERRUPT))
2542 return 0;
2543
2544 if (whichcpu != ~0UL && whichcpu != cpu)
2545 continue;
2546 addr = symaddr + KDB_PCU(cpu);
2547 diag = kdb_getword(&val, addr, bytesperword);
2548 if (diag) {
2549 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2550 "read, diag=%d\n", cpu, addr, diag);
2551 continue;
2552 }
2553 kdb_printf("%5d ", cpu);
2554 kdb_md_line(fmtstr, addr,
2555 bytesperword == KDB_WORD_SIZE,
2556 1, bytesperword, 1, 1, 0);
2557 }
2558#undef KDB_PCU
2559 return 0;
2560}
2561
2562/*
2563 * display help for the use of cmd | grep pattern
2564 */
2565static int kdb_grep_help(int argc, const char **argv)
2566{
2567 kdb_printf("Usage of cmd args | grep pattern:\n");
2568 kdb_printf(" Any command's output may be filtered through an ");
2569 kdb_printf("emulated 'pipe'.\n");
2570 kdb_printf(" 'grep' is just a key word.\n");
2571 kdb_printf(" The pattern may include a very limited set of "
2572 "metacharacters:\n");
2573 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2574 kdb_printf(" And if there are spaces in the pattern, you may "
2575 "quote it:\n");
2576 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2577 " or \"^pat tern$\"\n");
2578 return 0;
2579}
2580
2581/**
2582 * kdb_register() - This function is used to register a kernel debugger
2583 * command.
2584 * @cmd: pointer to kdb command
2585 *
2586 * Note that it's the job of the caller to keep the memory for the cmd
2587 * allocated until unregister is called.
2588 */
2589int kdb_register(kdbtab_t *cmd)
2590{
2591 kdbtab_t *kp;
2592
2593 list_for_each_entry(kp, &kdb_cmds_head, list_node) {
2594 if (strcmp(kp->name, cmd->name) == 0) {
2595 kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
2596 cmd->name, cmd->func, cmd->help);
2597 return 1;
2598 }
2599 }
2600
2601 list_add_tail(&cmd->list_node, &kdb_cmds_head);
2602 return 0;
2603}
2604EXPORT_SYMBOL_GPL(kdb_register);
2605
2606/**
2607 * kdb_register_table() - This function is used to register a kdb command
2608 * table.
2609 * @kp: pointer to kdb command table
2610 * @len: length of kdb command table
2611 */
2612void kdb_register_table(kdbtab_t *kp, size_t len)
2613{
2614 while (len--) {
2615 list_add_tail(&kp->list_node, &kdb_cmds_head);
2616 kp++;
2617 }
2618}
2619
2620/**
2621 * kdb_unregister() - This function is used to unregister a kernel debugger
2622 * command. It is generally called when a module which
2623 * implements kdb command is unloaded.
2624 * @cmd: pointer to kdb command
2625 */
2626void kdb_unregister(kdbtab_t *cmd)
2627{
2628 list_del(&cmd->list_node);
2629}
2630EXPORT_SYMBOL_GPL(kdb_unregister);
2631
2632static kdbtab_t maintab[] = {
2633 { .name = "md",
2634 .func = kdb_md,
2635 .usage = "<vaddr>",
2636 .help = "Display Memory Contents, also mdWcN, e.g. md8c1",
2637 .minlen = 1,
2638 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2639 },
2640 { .name = "mdr",
2641 .func = kdb_md,
2642 .usage = "<vaddr> <bytes>",
2643 .help = "Display Raw Memory",
2644 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2645 },
2646 { .name = "mdp",
2647 .func = kdb_md,
2648 .usage = "<paddr> <bytes>",
2649 .help = "Display Physical Memory",
2650 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2651 },
2652 { .name = "mds",
2653 .func = kdb_md,
2654 .usage = "<vaddr>",
2655 .help = "Display Memory Symbolically",
2656 .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
2657 },
2658 { .name = "mm",
2659 .func = kdb_mm,
2660 .usage = "<vaddr> <contents>",
2661 .help = "Modify Memory Contents",
2662 .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
2663 },
2664 { .name = "go",
2665 .func = kdb_go,
2666 .usage = "[<vaddr>]",
2667 .help = "Continue Execution",
2668 .minlen = 1,
2669 .flags = KDB_ENABLE_REG_WRITE |
2670 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2671 },
2672 { .name = "rd",
2673 .func = kdb_rd,
2674 .usage = "",
2675 .help = "Display Registers",
2676 .flags = KDB_ENABLE_REG_READ,
2677 },
2678 { .name = "rm",
2679 .func = kdb_rm,
2680 .usage = "<reg> <contents>",
2681 .help = "Modify Registers",
2682 .flags = KDB_ENABLE_REG_WRITE,
2683 },
2684 { .name = "ef",
2685 .func = kdb_ef,
2686 .usage = "<vaddr>",
2687 .help = "Display exception frame",
2688 .flags = KDB_ENABLE_MEM_READ,
2689 },
2690 { .name = "bt",
2691 .func = kdb_bt,
2692 .usage = "[<vaddr>]",
2693 .help = "Stack traceback",
2694 .minlen = 1,
2695 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2696 },
2697 { .name = "btp",
2698 .func = kdb_bt,
2699 .usage = "<pid>",
2700 .help = "Display stack for process <pid>",
2701 .flags = KDB_ENABLE_INSPECT,
2702 },
2703 { .name = "bta",
2704 .func = kdb_bt,
2705 .usage = "[<state_chars>|A]",
2706 .help = "Backtrace all processes whose state matches",
2707 .flags = KDB_ENABLE_INSPECT,
2708 },
2709 { .name = "btc",
2710 .func = kdb_bt,
2711 .usage = "",
2712 .help = "Backtrace current process on each cpu",
2713 .flags = KDB_ENABLE_INSPECT,
2714 },
2715 { .name = "btt",
2716 .func = kdb_bt,
2717 .usage = "<vaddr>",
2718 .help = "Backtrace process given its struct task address",
2719 .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
2720 },
2721 { .name = "env",
2722 .func = kdb_env,
2723 .usage = "",
2724 .help = "Show environment variables",
2725 .flags = KDB_ENABLE_ALWAYS_SAFE,
2726 },
2727 { .name = "set",
2728 .func = kdb_set,
2729 .usage = "",
2730 .help = "Set environment variables",
2731 .flags = KDB_ENABLE_ALWAYS_SAFE,
2732 },
2733 { .name = "help",
2734 .func = kdb_help,
2735 .usage = "",
2736 .help = "Display Help Message",
2737 .minlen = 1,
2738 .flags = KDB_ENABLE_ALWAYS_SAFE,
2739 },
2740 { .name = "?",
2741 .func = kdb_help,
2742 .usage = "",
2743 .help = "Display Help Message",
2744 .flags = KDB_ENABLE_ALWAYS_SAFE,
2745 },
2746 { .name = "cpu",
2747 .func = kdb_cpu,
2748 .usage = "<cpunum>",
2749 .help = "Switch to new cpu",
2750 .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
2751 },
2752 { .name = "kgdb",
2753 .func = kdb_kgdb,
2754 .usage = "",
2755 .help = "Enter kgdb mode",
2756 .flags = 0,
2757 },
2758 { .name = "ps",
2759 .func = kdb_ps,
2760 .usage = "[<state_chars>|A]",
2761 .help = "Display active task list",
2762 .flags = KDB_ENABLE_INSPECT,
2763 },
2764 { .name = "pid",
2765 .func = kdb_pid,
2766 .usage = "<pidnum>",
2767 .help = "Switch to another task",
2768 .flags = KDB_ENABLE_INSPECT,
2769 },
2770 { .name = "reboot",
2771 .func = kdb_reboot,
2772 .usage = "",
2773 .help = "Reboot the machine immediately",
2774 .flags = KDB_ENABLE_REBOOT,
2775 },
2776#if defined(CONFIG_MODULES)
2777 { .name = "lsmod",
2778 .func = kdb_lsmod,
2779 .usage = "",
2780 .help = "List loaded kernel modules",
2781 .flags = KDB_ENABLE_INSPECT,
2782 },
2783#endif
2784#if defined(CONFIG_MAGIC_SYSRQ)
2785 { .name = "sr",
2786 .func = kdb_sr,
2787 .usage = "<key>",
2788 .help = "Magic SysRq key",
2789 .flags = KDB_ENABLE_ALWAYS_SAFE,
2790 },
2791#endif
2792#if defined(CONFIG_PRINTK)
2793 { .name = "dmesg",
2794 .func = kdb_dmesg,
2795 .usage = "[lines]",
2796 .help = "Display syslog buffer",
2797 .flags = KDB_ENABLE_ALWAYS_SAFE,
2798 },
2799#endif
2800 { .name = "defcmd",
2801 .func = kdb_defcmd,
2802 .usage = "name \"usage\" \"help\"",
2803 .help = "Define a set of commands, down to endefcmd",
2804 /*
2805 * Macros are always safe because when executed each
2806 * internal command re-enters kdb_parse() and is safety
2807 * checked individually.
2808 */
2809 .flags = KDB_ENABLE_ALWAYS_SAFE,
2810 },
2811 { .name = "kill",
2812 .func = kdb_kill,
2813 .usage = "<-signal> <pid>",
2814 .help = "Send a signal to a process",
2815 .flags = KDB_ENABLE_SIGNAL,
2816 },
2817 { .name = "summary",
2818 .func = kdb_summary,
2819 .usage = "",
2820 .help = "Summarize the system",
2821 .minlen = 4,
2822 .flags = KDB_ENABLE_ALWAYS_SAFE,
2823 },
2824 { .name = "per_cpu",
2825 .func = kdb_per_cpu,
2826 .usage = "<sym> [<bytes>] [<cpu>]",
2827 .help = "Display per_cpu variables",
2828 .minlen = 3,
2829 .flags = KDB_ENABLE_MEM_READ,
2830 },
2831 { .name = "grephelp",
2832 .func = kdb_grep_help,
2833 .usage = "",
2834 .help = "Display help on | grep",
2835 .flags = KDB_ENABLE_ALWAYS_SAFE,
2836 },
2837};
2838
2839static kdbtab_t nmicmd = {
2840 .name = "disable_nmi",
2841 .func = kdb_disable_nmi,
2842 .usage = "",
2843 .help = "Disable NMI entry to KDB",
2844 .flags = KDB_ENABLE_ALWAYS_SAFE,
2845};
2846
2847/* Initialize the kdb command table. */
2848static void __init kdb_inittab(void)
2849{
2850 kdb_register_table(maintab, ARRAY_SIZE(maintab));
2851 if (arch_kgdb_ops.enable_nmi)
2852 kdb_register_table(&nmicmd, 1);
2853}
2854
2855/* Execute any commands defined in kdb_cmds. */
2856static void __init kdb_cmd_init(void)
2857{
2858 int i, diag;
2859 for (i = 0; kdb_cmds[i]; ++i) {
2860 diag = kdb_parse(kdb_cmds[i]);
2861 if (diag)
2862 kdb_printf("kdb command %s failed, kdb diag %d\n",
2863 kdb_cmds[i], diag);
2864 }
2865 if (defcmd_in_progress) {
2866 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2867 kdb_parse("endefcmd");
2868 }
2869}
2870
2871/* Initialize kdb_printf, breakpoint tables and kdb state */
2872void __init kdb_init(int lvl)
2873{
2874 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2875 int i;
2876
2877 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2878 return;
2879 for (i = kdb_init_lvl; i < lvl; i++) {
2880 switch (i) {
2881 case KDB_NOT_INITIALIZED:
2882 kdb_inittab(); /* Initialize Command Table */
2883 kdb_initbptab(); /* Initialize Breakpoints */
2884 break;
2885 case KDB_INIT_EARLY:
2886 kdb_cmd_init(); /* Build kdb_cmds tables */
2887 break;
2888 }
2889 }
2890 kdb_init_lvl = lvl;
2891}