Loading...
1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sysrq.h>
22#include <linux/smp.h>
23#include <linux/utsname.h>
24#include <linux/vmalloc.h>
25#include <linux/atomic.h>
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/mm.h>
29#include <linux/init.h>
30#include <linux/kallsyms.h>
31#include <linux/kgdb.h>
32#include <linux/kdb.h>
33#include <linux/notifier.h>
34#include <linux/interrupt.h>
35#include <linux/delay.h>
36#include <linux/nmi.h>
37#include <linux/time.h>
38#include <linux/ptrace.h>
39#include <linux/sysctl.h>
40#include <linux/cpu.h>
41#include <linux/kdebug.h>
42#include <linux/proc_fs.h>
43#include <linux/uaccess.h>
44#include <linux/slab.h>
45#include "kdb_private.h"
46
47#undef MODULE_PARAM_PREFIX
48#define MODULE_PARAM_PREFIX "kdb."
49
50static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
51module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
52
53char kdb_grep_string[KDB_GREP_STRLEN];
54int kdb_grepping_flag;
55EXPORT_SYMBOL(kdb_grepping_flag);
56int kdb_grep_leading;
57int kdb_grep_trailing;
58
59/*
60 * Kernel debugger state flags
61 */
62int kdb_flags;
63
64/*
65 * kdb_lock protects updates to kdb_initial_cpu. Used to
66 * single thread processors through the kernel debugger.
67 */
68int kdb_initial_cpu = -1; /* cpu number that owns kdb */
69int kdb_nextline = 1;
70int kdb_state; /* General KDB state */
71
72struct task_struct *kdb_current_task;
73EXPORT_SYMBOL(kdb_current_task);
74struct pt_regs *kdb_current_regs;
75
76const char *kdb_diemsg;
77static int kdb_go_count;
78#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
79static unsigned int kdb_continue_catastrophic =
80 CONFIG_KDB_CONTINUE_CATASTROPHIC;
81#else
82static unsigned int kdb_continue_catastrophic;
83#endif
84
85/* kdb_commands describes the available commands. */
86static kdbtab_t *kdb_commands;
87#define KDB_BASE_CMD_MAX 50
88static int kdb_max_commands = KDB_BASE_CMD_MAX;
89static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
90#define for_each_kdbcmd(cmd, num) \
91 for ((cmd) = kdb_base_commands, (num) = 0; \
92 num < kdb_max_commands; \
93 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
94
95typedef struct _kdbmsg {
96 int km_diag; /* kdb diagnostic */
97 char *km_msg; /* Corresponding message text */
98} kdbmsg_t;
99
100#define KDBMSG(msgnum, text) \
101 { KDB_##msgnum, text }
102
103static kdbmsg_t kdbmsgs[] = {
104 KDBMSG(NOTFOUND, "Command Not Found"),
105 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
106 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
107 "8 is only allowed on 64 bit systems"),
108 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
109 KDBMSG(NOTENV, "Cannot find environment variable"),
110 KDBMSG(NOENVVALUE, "Environment variable should have value"),
111 KDBMSG(NOTIMP, "Command not implemented"),
112 KDBMSG(ENVFULL, "Environment full"),
113 KDBMSG(ENVBUFFULL, "Environment buffer full"),
114 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
115#ifdef CONFIG_CPU_XSCALE
116 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
117#else
118 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
119#endif
120 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
121 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
122 KDBMSG(BADMODE, "Invalid IDMODE"),
123 KDBMSG(BADINT, "Illegal numeric value"),
124 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
125 KDBMSG(BADREG, "Invalid register name"),
126 KDBMSG(BADCPUNUM, "Invalid cpu number"),
127 KDBMSG(BADLENGTH, "Invalid length field"),
128 KDBMSG(NOBP, "No Breakpoint exists"),
129 KDBMSG(BADADDR, "Invalid address"),
130 KDBMSG(NOPERM, "Permission denied"),
131};
132#undef KDBMSG
133
134static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
135
136
137/*
138 * Initial environment. This is all kept static and local to
139 * this file. We don't want to rely on the memory allocation
140 * mechanisms in the kernel, so we use a very limited allocate-only
141 * heap for new and altered environment variables. The entire
142 * environment is limited to a fixed number of entries (add more
143 * to __env[] if required) and a fixed amount of heap (add more to
144 * KDB_ENVBUFSIZE if required).
145 */
146
147static char *__env[] = {
148#if defined(CONFIG_SMP)
149 "PROMPT=[%d]kdb> ",
150#else
151 "PROMPT=kdb> ",
152#endif
153 "MOREPROMPT=more> ",
154 "RADIX=16",
155 "MDCOUNT=8", /* lines of md output */
156 KDB_PLATFORM_ENV,
157 "DTABCOUNT=30",
158 "NOSECT=1",
159 (char *)0,
160 (char *)0,
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176 (char *)0,
177 (char *)0,
178 (char *)0,
179 (char *)0,
180 (char *)0,
181 (char *)0,
182 (char *)0,
183};
184
185static const int __nenv = ARRAY_SIZE(__env);
186
187struct task_struct *kdb_curr_task(int cpu)
188{
189 struct task_struct *p = curr_task(cpu);
190#ifdef _TIF_MCA_INIT
191 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
192 p = krp->p;
193#endif
194 return p;
195}
196
197/*
198 * Check whether the flags of the current command and the permissions
199 * of the kdb console has allow a command to be run.
200 */
201static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
202 bool no_args)
203{
204 /* permissions comes from userspace so needs massaging slightly */
205 permissions &= KDB_ENABLE_MASK;
206 permissions |= KDB_ENABLE_ALWAYS_SAFE;
207
208 /* some commands change group when launched with no arguments */
209 if (no_args)
210 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
211
212 flags |= KDB_ENABLE_ALL;
213
214 return permissions & flags;
215}
216
217/*
218 * kdbgetenv - This function will return the character string value of
219 * an environment variable.
220 * Parameters:
221 * match A character string representing an environment variable.
222 * Returns:
223 * NULL No environment variable matches 'match'
224 * char* Pointer to string value of environment variable.
225 */
226char *kdbgetenv(const char *match)
227{
228 char **ep = __env;
229 int matchlen = strlen(match);
230 int i;
231
232 for (i = 0; i < __nenv; i++) {
233 char *e = *ep++;
234
235 if (!e)
236 continue;
237
238 if ((strncmp(match, e, matchlen) == 0)
239 && ((e[matchlen] == '\0')
240 || (e[matchlen] == '='))) {
241 char *cp = strchr(e, '=');
242 return cp ? ++cp : "";
243 }
244 }
245 return NULL;
246}
247
248/*
249 * kdballocenv - This function is used to allocate bytes for
250 * environment entries.
251 * Parameters:
252 * match A character string representing a numeric value
253 * Outputs:
254 * *value the unsigned long representation of the env variable 'match'
255 * Returns:
256 * Zero on success, a kdb diagnostic on failure.
257 * Remarks:
258 * We use a static environment buffer (envbuffer) to hold the values
259 * of dynamically generated environment variables (see kdb_set). Buffer
260 * space once allocated is never free'd, so over time, the amount of space
261 * (currently 512 bytes) will be exhausted if env variables are changed
262 * frequently.
263 */
264static char *kdballocenv(size_t bytes)
265{
266#define KDB_ENVBUFSIZE 512
267 static char envbuffer[KDB_ENVBUFSIZE];
268 static int envbufsize;
269 char *ep = NULL;
270
271 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
272 ep = &envbuffer[envbufsize];
273 envbufsize += bytes;
274 }
275 return ep;
276}
277
278/*
279 * kdbgetulenv - This function will return the value of an unsigned
280 * long-valued environment variable.
281 * Parameters:
282 * match A character string representing a numeric value
283 * Outputs:
284 * *value the unsigned long represntation of the env variable 'match'
285 * Returns:
286 * Zero on success, a kdb diagnostic on failure.
287 */
288static int kdbgetulenv(const char *match, unsigned long *value)
289{
290 char *ep;
291
292 ep = kdbgetenv(match);
293 if (!ep)
294 return KDB_NOTENV;
295 if (strlen(ep) == 0)
296 return KDB_NOENVVALUE;
297
298 *value = simple_strtoul(ep, NULL, 0);
299
300 return 0;
301}
302
303/*
304 * kdbgetintenv - This function will return the value of an
305 * integer-valued environment variable.
306 * Parameters:
307 * match A character string representing an integer-valued env variable
308 * Outputs:
309 * *value the integer representation of the environment variable 'match'
310 * Returns:
311 * Zero on success, a kdb diagnostic on failure.
312 */
313int kdbgetintenv(const char *match, int *value)
314{
315 unsigned long val;
316 int diag;
317
318 diag = kdbgetulenv(match, &val);
319 if (!diag)
320 *value = (int) val;
321 return diag;
322}
323
324/*
325 * kdbgetularg - This function will convert a numeric string into an
326 * unsigned long value.
327 * Parameters:
328 * arg A character string representing a numeric value
329 * Outputs:
330 * *value the unsigned long represntation of arg.
331 * Returns:
332 * Zero on success, a kdb diagnostic on failure.
333 */
334int kdbgetularg(const char *arg, unsigned long *value)
335{
336 char *endp;
337 unsigned long val;
338
339 val = simple_strtoul(arg, &endp, 0);
340
341 if (endp == arg) {
342 /*
343 * Also try base 16, for us folks too lazy to type the
344 * leading 0x...
345 */
346 val = simple_strtoul(arg, &endp, 16);
347 if (endp == arg)
348 return KDB_BADINT;
349 }
350
351 *value = val;
352
353 return 0;
354}
355
356int kdbgetu64arg(const char *arg, u64 *value)
357{
358 char *endp;
359 u64 val;
360
361 val = simple_strtoull(arg, &endp, 0);
362
363 if (endp == arg) {
364
365 val = simple_strtoull(arg, &endp, 16);
366 if (endp == arg)
367 return KDB_BADINT;
368 }
369
370 *value = val;
371
372 return 0;
373}
374
375/*
376 * kdb_set - This function implements the 'set' command. Alter an
377 * existing environment variable or create a new one.
378 */
379int kdb_set(int argc, const char **argv)
380{
381 int i;
382 char *ep;
383 size_t varlen, vallen;
384
385 /*
386 * we can be invoked two ways:
387 * set var=value argv[1]="var", argv[2]="value"
388 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
389 * - if the latter, shift 'em down.
390 */
391 if (argc == 3) {
392 argv[2] = argv[3];
393 argc--;
394 }
395
396 if (argc != 2)
397 return KDB_ARGCOUNT;
398
399 /*
400 * Check for internal variables
401 */
402 if (strcmp(argv[1], "KDBDEBUG") == 0) {
403 unsigned int debugflags;
404 char *cp;
405
406 debugflags = simple_strtoul(argv[2], &cp, 0);
407 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
408 kdb_printf("kdb: illegal debug flags '%s'\n",
409 argv[2]);
410 return 0;
411 }
412 kdb_flags = (kdb_flags &
413 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
414 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
415
416 return 0;
417 }
418
419 /*
420 * Tokenizer squashed the '=' sign. argv[1] is variable
421 * name, argv[2] = value.
422 */
423 varlen = strlen(argv[1]);
424 vallen = strlen(argv[2]);
425 ep = kdballocenv(varlen + vallen + 2);
426 if (ep == (char *)0)
427 return KDB_ENVBUFFULL;
428
429 sprintf(ep, "%s=%s", argv[1], argv[2]);
430
431 ep[varlen+vallen+1] = '\0';
432
433 for (i = 0; i < __nenv; i++) {
434 if (__env[i]
435 && ((strncmp(__env[i], argv[1], varlen) == 0)
436 && ((__env[i][varlen] == '\0')
437 || (__env[i][varlen] == '=')))) {
438 __env[i] = ep;
439 return 0;
440 }
441 }
442
443 /*
444 * Wasn't existing variable. Fit into slot.
445 */
446 for (i = 0; i < __nenv-1; i++) {
447 if (__env[i] == (char *)0) {
448 __env[i] = ep;
449 return 0;
450 }
451 }
452
453 return KDB_ENVFULL;
454}
455
456static int kdb_check_regs(void)
457{
458 if (!kdb_current_regs) {
459 kdb_printf("No current kdb registers."
460 " You may need to select another task\n");
461 return KDB_BADREG;
462 }
463 return 0;
464}
465
466/*
467 * kdbgetaddrarg - This function is responsible for parsing an
468 * address-expression and returning the value of the expression,
469 * symbol name, and offset to the caller.
470 *
471 * The argument may consist of a numeric value (decimal or
472 * hexidecimal), a symbol name, a register name (preceded by the
473 * percent sign), an environment variable with a numeric value
474 * (preceded by a dollar sign) or a simple arithmetic expression
475 * consisting of a symbol name, +/-, and a numeric constant value
476 * (offset).
477 * Parameters:
478 * argc - count of arguments in argv
479 * argv - argument vector
480 * *nextarg - index to next unparsed argument in argv[]
481 * regs - Register state at time of KDB entry
482 * Outputs:
483 * *value - receives the value of the address-expression
484 * *offset - receives the offset specified, if any
485 * *name - receives the symbol name, if any
486 * *nextarg - index to next unparsed argument in argv[]
487 * Returns:
488 * zero is returned on success, a kdb diagnostic code is
489 * returned on error.
490 */
491int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
492 unsigned long *value, long *offset,
493 char **name)
494{
495 unsigned long addr;
496 unsigned long off = 0;
497 int positive;
498 int diag;
499 int found = 0;
500 char *symname;
501 char symbol = '\0';
502 char *cp;
503 kdb_symtab_t symtab;
504
505 /*
506 * If the enable flags prohibit both arbitrary memory access
507 * and flow control then there are no reasonable grounds to
508 * provide symbol lookup.
509 */
510 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
511 kdb_cmd_enabled, false))
512 return KDB_NOPERM;
513
514 /*
515 * Process arguments which follow the following syntax:
516 *
517 * symbol | numeric-address [+/- numeric-offset]
518 * %register
519 * $environment-variable
520 */
521
522 if (*nextarg > argc)
523 return KDB_ARGCOUNT;
524
525 symname = (char *)argv[*nextarg];
526
527 /*
528 * If there is no whitespace between the symbol
529 * or address and the '+' or '-' symbols, we
530 * remember the character and replace it with a
531 * null so the symbol/value can be properly parsed
532 */
533 cp = strpbrk(symname, "+-");
534 if (cp != NULL) {
535 symbol = *cp;
536 *cp++ = '\0';
537 }
538
539 if (symname[0] == '$') {
540 diag = kdbgetulenv(&symname[1], &addr);
541 if (diag)
542 return diag;
543 } else if (symname[0] == '%') {
544 diag = kdb_check_regs();
545 if (diag)
546 return diag;
547 /* Implement register values with % at a later time as it is
548 * arch optional.
549 */
550 return KDB_NOTIMP;
551 } else {
552 found = kdbgetsymval(symname, &symtab);
553 if (found) {
554 addr = symtab.sym_start;
555 } else {
556 diag = kdbgetularg(argv[*nextarg], &addr);
557 if (diag)
558 return diag;
559 }
560 }
561
562 if (!found)
563 found = kdbnearsym(addr, &symtab);
564
565 (*nextarg)++;
566
567 if (name)
568 *name = symname;
569 if (value)
570 *value = addr;
571 if (offset && name && *name)
572 *offset = addr - symtab.sym_start;
573
574 if ((*nextarg > argc)
575 && (symbol == '\0'))
576 return 0;
577
578 /*
579 * check for +/- and offset
580 */
581
582 if (symbol == '\0') {
583 if ((argv[*nextarg][0] != '+')
584 && (argv[*nextarg][0] != '-')) {
585 /*
586 * Not our argument. Return.
587 */
588 return 0;
589 } else {
590 positive = (argv[*nextarg][0] == '+');
591 (*nextarg)++;
592 }
593 } else
594 positive = (symbol == '+');
595
596 /*
597 * Now there must be an offset!
598 */
599 if ((*nextarg > argc)
600 && (symbol == '\0')) {
601 return KDB_INVADDRFMT;
602 }
603
604 if (!symbol) {
605 cp = (char *)argv[*nextarg];
606 (*nextarg)++;
607 }
608
609 diag = kdbgetularg(cp, &off);
610 if (diag)
611 return diag;
612
613 if (!positive)
614 off = -off;
615
616 if (offset)
617 *offset += off;
618
619 if (value)
620 *value += off;
621
622 return 0;
623}
624
625static void kdb_cmderror(int diag)
626{
627 int i;
628
629 if (diag >= 0) {
630 kdb_printf("no error detected (diagnostic is %d)\n", diag);
631 return;
632 }
633
634 for (i = 0; i < __nkdb_err; i++) {
635 if (kdbmsgs[i].km_diag == diag) {
636 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
637 return;
638 }
639 }
640
641 kdb_printf("Unknown diag %d\n", -diag);
642}
643
644/*
645 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
646 * command which defines one command as a set of other commands,
647 * terminated by endefcmd. kdb_defcmd processes the initial
648 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
649 * the following commands until 'endefcmd'.
650 * Inputs:
651 * argc argument count
652 * argv argument vector
653 * Returns:
654 * zero for success, a kdb diagnostic if error
655 */
656struct defcmd_set {
657 int count;
658 int usable;
659 char *name;
660 char *usage;
661 char *help;
662 char **command;
663};
664static struct defcmd_set *defcmd_set;
665static int defcmd_set_count;
666static int defcmd_in_progress;
667
668/* Forward references */
669static int kdb_exec_defcmd(int argc, const char **argv);
670
671static int kdb_defcmd2(const char *cmdstr, const char *argv0)
672{
673 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
674 char **save_command = s->command;
675 if (strcmp(argv0, "endefcmd") == 0) {
676 defcmd_in_progress = 0;
677 if (!s->count)
678 s->usable = 0;
679 if (s->usable)
680 /* macros are always safe because when executed each
681 * internal command re-enters kdb_parse() and is
682 * safety checked individually.
683 */
684 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
685 s->help, 0,
686 KDB_ENABLE_ALWAYS_SAFE);
687 return 0;
688 }
689 if (!s->usable)
690 return KDB_NOTIMP;
691 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
692 if (!s->command) {
693 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
694 cmdstr);
695 s->usable = 0;
696 return KDB_NOTIMP;
697 }
698 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
699 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
700 kfree(save_command);
701 return 0;
702}
703
704static int kdb_defcmd(int argc, const char **argv)
705{
706 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
707 if (defcmd_in_progress) {
708 kdb_printf("kdb: nested defcmd detected, assuming missing "
709 "endefcmd\n");
710 kdb_defcmd2("endefcmd", "endefcmd");
711 }
712 if (argc == 0) {
713 int i;
714 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
715 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
716 s->usage, s->help);
717 for (i = 0; i < s->count; ++i)
718 kdb_printf("%s", s->command[i]);
719 kdb_printf("endefcmd\n");
720 }
721 return 0;
722 }
723 if (argc != 3)
724 return KDB_ARGCOUNT;
725 if (in_dbg_master()) {
726 kdb_printf("Command only available during kdb_init()\n");
727 return KDB_NOTIMP;
728 }
729 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
730 GFP_KDB);
731 if (!defcmd_set)
732 goto fail_defcmd;
733 memcpy(defcmd_set, save_defcmd_set,
734 defcmd_set_count * sizeof(*defcmd_set));
735 s = defcmd_set + defcmd_set_count;
736 memset(s, 0, sizeof(*s));
737 s->usable = 1;
738 s->name = kdb_strdup(argv[1], GFP_KDB);
739 if (!s->name)
740 goto fail_name;
741 s->usage = kdb_strdup(argv[2], GFP_KDB);
742 if (!s->usage)
743 goto fail_usage;
744 s->help = kdb_strdup(argv[3], GFP_KDB);
745 if (!s->help)
746 goto fail_help;
747 if (s->usage[0] == '"') {
748 strcpy(s->usage, argv[2]+1);
749 s->usage[strlen(s->usage)-1] = '\0';
750 }
751 if (s->help[0] == '"') {
752 strcpy(s->help, argv[3]+1);
753 s->help[strlen(s->help)-1] = '\0';
754 }
755 ++defcmd_set_count;
756 defcmd_in_progress = 1;
757 kfree(save_defcmd_set);
758 return 0;
759fail_help:
760 kfree(s->usage);
761fail_usage:
762 kfree(s->name);
763fail_name:
764 kfree(defcmd_set);
765fail_defcmd:
766 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
767 defcmd_set = save_defcmd_set;
768 return KDB_NOTIMP;
769}
770
771/*
772 * kdb_exec_defcmd - Execute the set of commands associated with this
773 * defcmd name.
774 * Inputs:
775 * argc argument count
776 * argv argument vector
777 * Returns:
778 * zero for success, a kdb diagnostic if error
779 */
780static int kdb_exec_defcmd(int argc, const char **argv)
781{
782 int i, ret;
783 struct defcmd_set *s;
784 if (argc != 0)
785 return KDB_ARGCOUNT;
786 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
787 if (strcmp(s->name, argv[0]) == 0)
788 break;
789 }
790 if (i == defcmd_set_count) {
791 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
792 argv[0]);
793 return KDB_NOTIMP;
794 }
795 for (i = 0; i < s->count; ++i) {
796 /* Recursive use of kdb_parse, do not use argv after
797 * this point */
798 argv = NULL;
799 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
800 ret = kdb_parse(s->command[i]);
801 if (ret)
802 return ret;
803 }
804 return 0;
805}
806
807/* Command history */
808#define KDB_CMD_HISTORY_COUNT 32
809#define CMD_BUFLEN 200 /* kdb_printf: max printline
810 * size == 256 */
811static unsigned int cmd_head, cmd_tail;
812static unsigned int cmdptr;
813static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
814static char cmd_cur[CMD_BUFLEN];
815
816/*
817 * The "str" argument may point to something like | grep xyz
818 */
819static void parse_grep(const char *str)
820{
821 int len;
822 char *cp = (char *)str, *cp2;
823
824 /* sanity check: we should have been called with the \ first */
825 if (*cp != '|')
826 return;
827 cp++;
828 while (isspace(*cp))
829 cp++;
830 if (strncmp(cp, "grep ", 5)) {
831 kdb_printf("invalid 'pipe', see grephelp\n");
832 return;
833 }
834 cp += 5;
835 while (isspace(*cp))
836 cp++;
837 cp2 = strchr(cp, '\n');
838 if (cp2)
839 *cp2 = '\0'; /* remove the trailing newline */
840 len = strlen(cp);
841 if (len == 0) {
842 kdb_printf("invalid 'pipe', see grephelp\n");
843 return;
844 }
845 /* now cp points to a nonzero length search string */
846 if (*cp == '"') {
847 /* allow it be "x y z" by removing the "'s - there must
848 be two of them */
849 cp++;
850 cp2 = strchr(cp, '"');
851 if (!cp2) {
852 kdb_printf("invalid quoted string, see grephelp\n");
853 return;
854 }
855 *cp2 = '\0'; /* end the string where the 2nd " was */
856 }
857 kdb_grep_leading = 0;
858 if (*cp == '^') {
859 kdb_grep_leading = 1;
860 cp++;
861 }
862 len = strlen(cp);
863 kdb_grep_trailing = 0;
864 if (*(cp+len-1) == '$') {
865 kdb_grep_trailing = 1;
866 *(cp+len-1) = '\0';
867 }
868 len = strlen(cp);
869 if (!len)
870 return;
871 if (len >= KDB_GREP_STRLEN) {
872 kdb_printf("search string too long\n");
873 return;
874 }
875 strcpy(kdb_grep_string, cp);
876 kdb_grepping_flag++;
877 return;
878}
879
880/*
881 * kdb_parse - Parse the command line, search the command table for a
882 * matching command and invoke the command function. This
883 * function may be called recursively, if it is, the second call
884 * will overwrite argv and cbuf. It is the caller's
885 * responsibility to save their argv if they recursively call
886 * kdb_parse().
887 * Parameters:
888 * cmdstr The input command line to be parsed.
889 * regs The registers at the time kdb was entered.
890 * Returns:
891 * Zero for success, a kdb diagnostic if failure.
892 * Remarks:
893 * Limited to 20 tokens.
894 *
895 * Real rudimentary tokenization. Basically only whitespace
896 * is considered a token delimeter (but special consideration
897 * is taken of the '=' sign as used by the 'set' command).
898 *
899 * The algorithm used to tokenize the input string relies on
900 * there being at least one whitespace (or otherwise useless)
901 * character between tokens as the character immediately following
902 * the token is altered in-place to a null-byte to terminate the
903 * token string.
904 */
905
906#define MAXARGC 20
907
908int kdb_parse(const char *cmdstr)
909{
910 static char *argv[MAXARGC];
911 static int argc;
912 static char cbuf[CMD_BUFLEN+2];
913 char *cp;
914 char *cpp, quoted;
915 kdbtab_t *tp;
916 int i, escaped, ignore_errors = 0, check_grep = 0;
917
918 /*
919 * First tokenize the command string.
920 */
921 cp = (char *)cmdstr;
922
923 if (KDB_FLAG(CMD_INTERRUPT)) {
924 /* Previous command was interrupted, newline must not
925 * repeat the command */
926 KDB_FLAG_CLEAR(CMD_INTERRUPT);
927 KDB_STATE_SET(PAGER);
928 argc = 0; /* no repeat */
929 }
930
931 if (*cp != '\n' && *cp != '\0') {
932 argc = 0;
933 cpp = cbuf;
934 while (*cp) {
935 /* skip whitespace */
936 while (isspace(*cp))
937 cp++;
938 if ((*cp == '\0') || (*cp == '\n') ||
939 (*cp == '#' && !defcmd_in_progress))
940 break;
941 /* special case: check for | grep pattern */
942 if (*cp == '|') {
943 check_grep++;
944 break;
945 }
946 if (cpp >= cbuf + CMD_BUFLEN) {
947 kdb_printf("kdb_parse: command buffer "
948 "overflow, command ignored\n%s\n",
949 cmdstr);
950 return KDB_NOTFOUND;
951 }
952 if (argc >= MAXARGC - 1) {
953 kdb_printf("kdb_parse: too many arguments, "
954 "command ignored\n%s\n", cmdstr);
955 return KDB_NOTFOUND;
956 }
957 argv[argc++] = cpp;
958 escaped = 0;
959 quoted = '\0';
960 /* Copy to next unquoted and unescaped
961 * whitespace or '=' */
962 while (*cp && *cp != '\n' &&
963 (escaped || quoted || !isspace(*cp))) {
964 if (cpp >= cbuf + CMD_BUFLEN)
965 break;
966 if (escaped) {
967 escaped = 0;
968 *cpp++ = *cp++;
969 continue;
970 }
971 if (*cp == '\\') {
972 escaped = 1;
973 ++cp;
974 continue;
975 }
976 if (*cp == quoted)
977 quoted = '\0';
978 else if (*cp == '\'' || *cp == '"')
979 quoted = *cp;
980 *cpp = *cp++;
981 if (*cpp == '=' && !quoted)
982 break;
983 ++cpp;
984 }
985 *cpp++ = '\0'; /* Squash a ws or '=' character */
986 }
987 }
988 if (!argc)
989 return 0;
990 if (check_grep)
991 parse_grep(cp);
992 if (defcmd_in_progress) {
993 int result = kdb_defcmd2(cmdstr, argv[0]);
994 if (!defcmd_in_progress) {
995 argc = 0; /* avoid repeat on endefcmd */
996 *(argv[0]) = '\0';
997 }
998 return result;
999 }
1000 if (argv[0][0] == '-' && argv[0][1] &&
1001 (argv[0][1] < '0' || argv[0][1] > '9')) {
1002 ignore_errors = 1;
1003 ++argv[0];
1004 }
1005
1006 for_each_kdbcmd(tp, i) {
1007 if (tp->cmd_name) {
1008 /*
1009 * If this command is allowed to be abbreviated,
1010 * check to see if this is it.
1011 */
1012
1013 if (tp->cmd_minlen
1014 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1015 if (strncmp(argv[0],
1016 tp->cmd_name,
1017 tp->cmd_minlen) == 0) {
1018 break;
1019 }
1020 }
1021
1022 if (strcmp(argv[0], tp->cmd_name) == 0)
1023 break;
1024 }
1025 }
1026
1027 /*
1028 * If we don't find a command by this name, see if the first
1029 * few characters of this match any of the known commands.
1030 * e.g., md1c20 should match md.
1031 */
1032 if (i == kdb_max_commands) {
1033 for_each_kdbcmd(tp, i) {
1034 if (tp->cmd_name) {
1035 if (strncmp(argv[0],
1036 tp->cmd_name,
1037 strlen(tp->cmd_name)) == 0) {
1038 break;
1039 }
1040 }
1041 }
1042 }
1043
1044 if (i < kdb_max_commands) {
1045 int result;
1046
1047 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1048 return KDB_NOPERM;
1049
1050 KDB_STATE_SET(CMD);
1051 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1052 if (result && ignore_errors && result > KDB_CMD_GO)
1053 result = 0;
1054 KDB_STATE_CLEAR(CMD);
1055
1056 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1057 return result;
1058
1059 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1060 if (argv[argc])
1061 *(argv[argc]) = '\0';
1062 return result;
1063 }
1064
1065 /*
1066 * If the input with which we were presented does not
1067 * map to an existing command, attempt to parse it as an
1068 * address argument and display the result. Useful for
1069 * obtaining the address of a variable, or the nearest symbol
1070 * to an address contained in a register.
1071 */
1072 {
1073 unsigned long value;
1074 char *name = NULL;
1075 long offset;
1076 int nextarg = 0;
1077
1078 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1079 &value, &offset, &name)) {
1080 return KDB_NOTFOUND;
1081 }
1082
1083 kdb_printf("%s = ", argv[0]);
1084 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1085 kdb_printf("\n");
1086 return 0;
1087 }
1088}
1089
1090
1091static int handle_ctrl_cmd(char *cmd)
1092{
1093#define CTRL_P 16
1094#define CTRL_N 14
1095
1096 /* initial situation */
1097 if (cmd_head == cmd_tail)
1098 return 0;
1099 switch (*cmd) {
1100 case CTRL_P:
1101 if (cmdptr != cmd_tail)
1102 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1103 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1104 return 1;
1105 case CTRL_N:
1106 if (cmdptr != cmd_head)
1107 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1108 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1109 return 1;
1110 }
1111 return 0;
1112}
1113
1114/*
1115 * kdb_reboot - This function implements the 'reboot' command. Reboot
1116 * the system immediately, or loop for ever on failure.
1117 */
1118static int kdb_reboot(int argc, const char **argv)
1119{
1120 emergency_restart();
1121 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1122 while (1)
1123 cpu_relax();
1124 /* NOTREACHED */
1125 return 0;
1126}
1127
1128static void kdb_dumpregs(struct pt_regs *regs)
1129{
1130 int old_lvl = console_loglevel;
1131 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1132 kdb_trap_printk++;
1133 show_regs(regs);
1134 kdb_trap_printk--;
1135 kdb_printf("\n");
1136 console_loglevel = old_lvl;
1137}
1138
1139void kdb_set_current_task(struct task_struct *p)
1140{
1141 kdb_current_task = p;
1142
1143 if (kdb_task_has_cpu(p)) {
1144 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1145 return;
1146 }
1147 kdb_current_regs = NULL;
1148}
1149
1150/*
1151 * kdb_local - The main code for kdb. This routine is invoked on a
1152 * specific processor, it is not global. The main kdb() routine
1153 * ensures that only one processor at a time is in this routine.
1154 * This code is called with the real reason code on the first
1155 * entry to a kdb session, thereafter it is called with reason
1156 * SWITCH, even if the user goes back to the original cpu.
1157 * Inputs:
1158 * reason The reason KDB was invoked
1159 * error The hardware-defined error code
1160 * regs The exception frame at time of fault/breakpoint.
1161 * db_result Result code from the break or debug point.
1162 * Returns:
1163 * 0 KDB was invoked for an event which it wasn't responsible
1164 * 1 KDB handled the event for which it was invoked.
1165 * KDB_CMD_GO User typed 'go'.
1166 * KDB_CMD_CPU User switched to another cpu.
1167 * KDB_CMD_SS Single step.
1168 */
1169static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1170 kdb_dbtrap_t db_result)
1171{
1172 char *cmdbuf;
1173 int diag;
1174 struct task_struct *kdb_current =
1175 kdb_curr_task(raw_smp_processor_id());
1176
1177 KDB_DEBUG_STATE("kdb_local 1", reason);
1178 kdb_go_count = 0;
1179 if (reason == KDB_REASON_DEBUG) {
1180 /* special case below */
1181 } else {
1182 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1183 kdb_current, kdb_current ? kdb_current->pid : 0);
1184#if defined(CONFIG_SMP)
1185 kdb_printf("on processor %d ", raw_smp_processor_id());
1186#endif
1187 }
1188
1189 switch (reason) {
1190 case KDB_REASON_DEBUG:
1191 {
1192 /*
1193 * If re-entering kdb after a single step
1194 * command, don't print the message.
1195 */
1196 switch (db_result) {
1197 case KDB_DB_BPT:
1198 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1199 kdb_current, kdb_current->pid);
1200#if defined(CONFIG_SMP)
1201 kdb_printf("on processor %d ", raw_smp_processor_id());
1202#endif
1203 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1204 instruction_pointer(regs));
1205 break;
1206 case KDB_DB_SS:
1207 break;
1208 case KDB_DB_SSBPT:
1209 KDB_DEBUG_STATE("kdb_local 4", reason);
1210 return 1; /* kdba_db_trap did the work */
1211 default:
1212 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1213 db_result);
1214 break;
1215 }
1216
1217 }
1218 break;
1219 case KDB_REASON_ENTER:
1220 if (KDB_STATE(KEYBOARD))
1221 kdb_printf("due to Keyboard Entry\n");
1222 else
1223 kdb_printf("due to KDB_ENTER()\n");
1224 break;
1225 case KDB_REASON_KEYBOARD:
1226 KDB_STATE_SET(KEYBOARD);
1227 kdb_printf("due to Keyboard Entry\n");
1228 break;
1229 case KDB_REASON_ENTER_SLAVE:
1230 /* drop through, slaves only get released via cpu switch */
1231 case KDB_REASON_SWITCH:
1232 kdb_printf("due to cpu switch\n");
1233 break;
1234 case KDB_REASON_OOPS:
1235 kdb_printf("Oops: %s\n", kdb_diemsg);
1236 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1237 instruction_pointer(regs));
1238 kdb_dumpregs(regs);
1239 break;
1240 case KDB_REASON_SYSTEM_NMI:
1241 kdb_printf("due to System NonMaskable Interrupt\n");
1242 break;
1243 case KDB_REASON_NMI:
1244 kdb_printf("due to NonMaskable Interrupt @ "
1245 kdb_machreg_fmt "\n",
1246 instruction_pointer(regs));
1247 break;
1248 case KDB_REASON_SSTEP:
1249 case KDB_REASON_BREAK:
1250 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1251 reason == KDB_REASON_BREAK ?
1252 "Breakpoint" : "SS trap", instruction_pointer(regs));
1253 /*
1254 * Determine if this breakpoint is one that we
1255 * are interested in.
1256 */
1257 if (db_result != KDB_DB_BPT) {
1258 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1259 db_result);
1260 KDB_DEBUG_STATE("kdb_local 6", reason);
1261 return 0; /* Not for us, dismiss it */
1262 }
1263 break;
1264 case KDB_REASON_RECURSE:
1265 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1266 instruction_pointer(regs));
1267 break;
1268 default:
1269 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1270 KDB_DEBUG_STATE("kdb_local 8", reason);
1271 return 0; /* Not for us, dismiss it */
1272 }
1273
1274 while (1) {
1275 /*
1276 * Initialize pager context.
1277 */
1278 kdb_nextline = 1;
1279 KDB_STATE_CLEAR(SUPPRESS);
1280 kdb_grepping_flag = 0;
1281 /* ensure the old search does not leak into '/' commands */
1282 kdb_grep_string[0] = '\0';
1283
1284 cmdbuf = cmd_cur;
1285 *cmdbuf = '\0';
1286 *(cmd_hist[cmd_head]) = '\0';
1287
1288do_full_getstr:
1289#if defined(CONFIG_SMP)
1290 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1291 raw_smp_processor_id());
1292#else
1293 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1294#endif
1295 if (defcmd_in_progress)
1296 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1297
1298 /*
1299 * Fetch command from keyboard
1300 */
1301 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1302 if (*cmdbuf != '\n') {
1303 if (*cmdbuf < 32) {
1304 if (cmdptr == cmd_head) {
1305 strncpy(cmd_hist[cmd_head], cmd_cur,
1306 CMD_BUFLEN);
1307 *(cmd_hist[cmd_head] +
1308 strlen(cmd_hist[cmd_head])-1) = '\0';
1309 }
1310 if (!handle_ctrl_cmd(cmdbuf))
1311 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1312 cmdbuf = cmd_cur;
1313 goto do_full_getstr;
1314 } else {
1315 strncpy(cmd_hist[cmd_head], cmd_cur,
1316 CMD_BUFLEN);
1317 }
1318
1319 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1320 if (cmd_head == cmd_tail)
1321 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1322 }
1323
1324 cmdptr = cmd_head;
1325 diag = kdb_parse(cmdbuf);
1326 if (diag == KDB_NOTFOUND) {
1327 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1328 diag = 0;
1329 }
1330 if (diag == KDB_CMD_GO
1331 || diag == KDB_CMD_CPU
1332 || diag == KDB_CMD_SS
1333 || diag == KDB_CMD_KGDB)
1334 break;
1335
1336 if (diag)
1337 kdb_cmderror(diag);
1338 }
1339 KDB_DEBUG_STATE("kdb_local 9", diag);
1340 return diag;
1341}
1342
1343
1344/*
1345 * kdb_print_state - Print the state data for the current processor
1346 * for debugging.
1347 * Inputs:
1348 * text Identifies the debug point
1349 * value Any integer value to be printed, e.g. reason code.
1350 */
1351void kdb_print_state(const char *text, int value)
1352{
1353 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1354 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1355 kdb_state);
1356}
1357
1358/*
1359 * kdb_main_loop - After initial setup and assignment of the
1360 * controlling cpu, all cpus are in this loop. One cpu is in
1361 * control and will issue the kdb prompt, the others will spin
1362 * until 'go' or cpu switch.
1363 *
1364 * To get a consistent view of the kernel stacks for all
1365 * processes, this routine is invoked from the main kdb code via
1366 * an architecture specific routine. kdba_main_loop is
1367 * responsible for making the kernel stacks consistent for all
1368 * processes, there should be no difference between a blocked
1369 * process and a running process as far as kdb is concerned.
1370 * Inputs:
1371 * reason The reason KDB was invoked
1372 * error The hardware-defined error code
1373 * reason2 kdb's current reason code.
1374 * Initially error but can change
1375 * according to kdb state.
1376 * db_result Result code from break or debug point.
1377 * regs The exception frame at time of fault/breakpoint.
1378 * should always be valid.
1379 * Returns:
1380 * 0 KDB was invoked for an event which it wasn't responsible
1381 * 1 KDB handled the event for which it was invoked.
1382 */
1383int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1384 kdb_dbtrap_t db_result, struct pt_regs *regs)
1385{
1386 int result = 1;
1387 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1388 while (1) {
1389 /*
1390 * All processors except the one that is in control
1391 * will spin here.
1392 */
1393 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1394 while (KDB_STATE(HOLD_CPU)) {
1395 /* state KDB is turned off by kdb_cpu to see if the
1396 * other cpus are still live, each cpu in this loop
1397 * turns it back on.
1398 */
1399 if (!KDB_STATE(KDB))
1400 KDB_STATE_SET(KDB);
1401 }
1402
1403 KDB_STATE_CLEAR(SUPPRESS);
1404 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1405 if (KDB_STATE(LEAVING))
1406 break; /* Another cpu said 'go' */
1407 /* Still using kdb, this processor is in control */
1408 result = kdb_local(reason2, error, regs, db_result);
1409 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1410
1411 if (result == KDB_CMD_CPU)
1412 break;
1413
1414 if (result == KDB_CMD_SS) {
1415 KDB_STATE_SET(DOING_SS);
1416 break;
1417 }
1418
1419 if (result == KDB_CMD_KGDB) {
1420 if (!KDB_STATE(DOING_KGDB))
1421 kdb_printf("Entering please attach debugger "
1422 "or use $D#44+ or $3#33\n");
1423 break;
1424 }
1425 if (result && result != 1 && result != KDB_CMD_GO)
1426 kdb_printf("\nUnexpected kdb_local return code %d\n",
1427 result);
1428 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1429 break;
1430 }
1431 if (KDB_STATE(DOING_SS))
1432 KDB_STATE_CLEAR(SSBPT);
1433
1434 /* Clean up any keyboard devices before leaving */
1435 kdb_kbd_cleanup_state();
1436
1437 return result;
1438}
1439
1440/*
1441 * kdb_mdr - This function implements the guts of the 'mdr', memory
1442 * read command.
1443 * mdr <addr arg>,<byte count>
1444 * Inputs:
1445 * addr Start address
1446 * count Number of bytes
1447 * Returns:
1448 * Always 0. Any errors are detected and printed by kdb_getarea.
1449 */
1450static int kdb_mdr(unsigned long addr, unsigned int count)
1451{
1452 unsigned char c;
1453 while (count--) {
1454 if (kdb_getarea(c, addr))
1455 return 0;
1456 kdb_printf("%02x", c);
1457 addr++;
1458 }
1459 kdb_printf("\n");
1460 return 0;
1461}
1462
1463/*
1464 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1465 * 'md8' 'mdr' and 'mds' commands.
1466 *
1467 * md|mds [<addr arg> [<line count> [<radix>]]]
1468 * mdWcN [<addr arg> [<line count> [<radix>]]]
1469 * where W = is the width (1, 2, 4 or 8) and N is the count.
1470 * for eg., md1c20 reads 20 bytes, 1 at a time.
1471 * mdr <addr arg>,<byte count>
1472 */
1473static void kdb_md_line(const char *fmtstr, unsigned long addr,
1474 int symbolic, int nosect, int bytesperword,
1475 int num, int repeat, int phys)
1476{
1477 /* print just one line of data */
1478 kdb_symtab_t symtab;
1479 char cbuf[32];
1480 char *c = cbuf;
1481 int i;
1482 unsigned long word;
1483
1484 memset(cbuf, '\0', sizeof(cbuf));
1485 if (phys)
1486 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1487 else
1488 kdb_printf(kdb_machreg_fmt0 " ", addr);
1489
1490 for (i = 0; i < num && repeat--; i++) {
1491 if (phys) {
1492 if (kdb_getphysword(&word, addr, bytesperword))
1493 break;
1494 } else if (kdb_getword(&word, addr, bytesperword))
1495 break;
1496 kdb_printf(fmtstr, word);
1497 if (symbolic)
1498 kdbnearsym(word, &symtab);
1499 else
1500 memset(&symtab, 0, sizeof(symtab));
1501 if (symtab.sym_name) {
1502 kdb_symbol_print(word, &symtab, 0);
1503 if (!nosect) {
1504 kdb_printf("\n");
1505 kdb_printf(" %s %s "
1506 kdb_machreg_fmt " "
1507 kdb_machreg_fmt " "
1508 kdb_machreg_fmt, symtab.mod_name,
1509 symtab.sec_name, symtab.sec_start,
1510 symtab.sym_start, symtab.sym_end);
1511 }
1512 addr += bytesperword;
1513 } else {
1514 union {
1515 u64 word;
1516 unsigned char c[8];
1517 } wc;
1518 unsigned char *cp;
1519#ifdef __BIG_ENDIAN
1520 cp = wc.c + 8 - bytesperword;
1521#else
1522 cp = wc.c;
1523#endif
1524 wc.word = word;
1525#define printable_char(c) \
1526 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1527 switch (bytesperword) {
1528 case 8:
1529 *c++ = printable_char(*cp++);
1530 *c++ = printable_char(*cp++);
1531 *c++ = printable_char(*cp++);
1532 *c++ = printable_char(*cp++);
1533 addr += 4;
1534 case 4:
1535 *c++ = printable_char(*cp++);
1536 *c++ = printable_char(*cp++);
1537 addr += 2;
1538 case 2:
1539 *c++ = printable_char(*cp++);
1540 addr++;
1541 case 1:
1542 *c++ = printable_char(*cp++);
1543 addr++;
1544 break;
1545 }
1546#undef printable_char
1547 }
1548 }
1549 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1550 " ", cbuf);
1551}
1552
1553static int kdb_md(int argc, const char **argv)
1554{
1555 static unsigned long last_addr;
1556 static int last_radix, last_bytesperword, last_repeat;
1557 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1558 int nosect = 0;
1559 char fmtchar, fmtstr[64];
1560 unsigned long addr;
1561 unsigned long word;
1562 long offset = 0;
1563 int symbolic = 0;
1564 int valid = 0;
1565 int phys = 0;
1566
1567 kdbgetintenv("MDCOUNT", &mdcount);
1568 kdbgetintenv("RADIX", &radix);
1569 kdbgetintenv("BYTESPERWORD", &bytesperword);
1570
1571 /* Assume 'md <addr>' and start with environment values */
1572 repeat = mdcount * 16 / bytesperword;
1573
1574 if (strcmp(argv[0], "mdr") == 0) {
1575 if (argc != 2)
1576 return KDB_ARGCOUNT;
1577 valid = 1;
1578 } else if (isdigit(argv[0][2])) {
1579 bytesperword = (int)(argv[0][2] - '0');
1580 if (bytesperword == 0) {
1581 bytesperword = last_bytesperword;
1582 if (bytesperword == 0)
1583 bytesperword = 4;
1584 }
1585 last_bytesperword = bytesperword;
1586 repeat = mdcount * 16 / bytesperword;
1587 if (!argv[0][3])
1588 valid = 1;
1589 else if (argv[0][3] == 'c' && argv[0][4]) {
1590 char *p;
1591 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1592 mdcount = ((repeat * bytesperword) + 15) / 16;
1593 valid = !*p;
1594 }
1595 last_repeat = repeat;
1596 } else if (strcmp(argv[0], "md") == 0)
1597 valid = 1;
1598 else if (strcmp(argv[0], "mds") == 0)
1599 valid = 1;
1600 else if (strcmp(argv[0], "mdp") == 0) {
1601 phys = valid = 1;
1602 }
1603 if (!valid)
1604 return KDB_NOTFOUND;
1605
1606 if (argc == 0) {
1607 if (last_addr == 0)
1608 return KDB_ARGCOUNT;
1609 addr = last_addr;
1610 radix = last_radix;
1611 bytesperword = last_bytesperword;
1612 repeat = last_repeat;
1613 mdcount = ((repeat * bytesperword) + 15) / 16;
1614 }
1615
1616 if (argc) {
1617 unsigned long val;
1618 int diag, nextarg = 1;
1619 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1620 &offset, NULL);
1621 if (diag)
1622 return diag;
1623 if (argc > nextarg+2)
1624 return KDB_ARGCOUNT;
1625
1626 if (argc >= nextarg) {
1627 diag = kdbgetularg(argv[nextarg], &val);
1628 if (!diag) {
1629 mdcount = (int) val;
1630 repeat = mdcount * 16 / bytesperword;
1631 }
1632 }
1633 if (argc >= nextarg+1) {
1634 diag = kdbgetularg(argv[nextarg+1], &val);
1635 if (!diag)
1636 radix = (int) val;
1637 }
1638 }
1639
1640 if (strcmp(argv[0], "mdr") == 0)
1641 return kdb_mdr(addr, mdcount);
1642
1643 switch (radix) {
1644 case 10:
1645 fmtchar = 'd';
1646 break;
1647 case 16:
1648 fmtchar = 'x';
1649 break;
1650 case 8:
1651 fmtchar = 'o';
1652 break;
1653 default:
1654 return KDB_BADRADIX;
1655 }
1656
1657 last_radix = radix;
1658
1659 if (bytesperword > KDB_WORD_SIZE)
1660 return KDB_BADWIDTH;
1661
1662 switch (bytesperword) {
1663 case 8:
1664 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1665 break;
1666 case 4:
1667 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1668 break;
1669 case 2:
1670 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1671 break;
1672 case 1:
1673 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1674 break;
1675 default:
1676 return KDB_BADWIDTH;
1677 }
1678
1679 last_repeat = repeat;
1680 last_bytesperword = bytesperword;
1681
1682 if (strcmp(argv[0], "mds") == 0) {
1683 symbolic = 1;
1684 /* Do not save these changes as last_*, they are temporary mds
1685 * overrides.
1686 */
1687 bytesperword = KDB_WORD_SIZE;
1688 repeat = mdcount;
1689 kdbgetintenv("NOSECT", &nosect);
1690 }
1691
1692 /* Round address down modulo BYTESPERWORD */
1693
1694 addr &= ~(bytesperword-1);
1695
1696 while (repeat > 0) {
1697 unsigned long a;
1698 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1699
1700 if (KDB_FLAG(CMD_INTERRUPT))
1701 return 0;
1702 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1703 if (phys) {
1704 if (kdb_getphysword(&word, a, bytesperword)
1705 || word)
1706 break;
1707 } else if (kdb_getword(&word, a, bytesperword) || word)
1708 break;
1709 }
1710 n = min(num, repeat);
1711 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1712 num, repeat, phys);
1713 addr += bytesperword * n;
1714 repeat -= n;
1715 z = (z + num - 1) / num;
1716 if (z > 2) {
1717 int s = num * (z-2);
1718 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1719 " zero suppressed\n",
1720 addr, addr + bytesperword * s - 1);
1721 addr += bytesperword * s;
1722 repeat -= s;
1723 }
1724 }
1725 last_addr = addr;
1726
1727 return 0;
1728}
1729
1730/*
1731 * kdb_mm - This function implements the 'mm' command.
1732 * mm address-expression new-value
1733 * Remarks:
1734 * mm works on machine words, mmW works on bytes.
1735 */
1736static int kdb_mm(int argc, const char **argv)
1737{
1738 int diag;
1739 unsigned long addr;
1740 long offset = 0;
1741 unsigned long contents;
1742 int nextarg;
1743 int width;
1744
1745 if (argv[0][2] && !isdigit(argv[0][2]))
1746 return KDB_NOTFOUND;
1747
1748 if (argc < 2)
1749 return KDB_ARGCOUNT;
1750
1751 nextarg = 1;
1752 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1753 if (diag)
1754 return diag;
1755
1756 if (nextarg > argc)
1757 return KDB_ARGCOUNT;
1758 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1759 if (diag)
1760 return diag;
1761
1762 if (nextarg != argc + 1)
1763 return KDB_ARGCOUNT;
1764
1765 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1766 diag = kdb_putword(addr, contents, width);
1767 if (diag)
1768 return diag;
1769
1770 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1771
1772 return 0;
1773}
1774
1775/*
1776 * kdb_go - This function implements the 'go' command.
1777 * go [address-expression]
1778 */
1779static int kdb_go(int argc, const char **argv)
1780{
1781 unsigned long addr;
1782 int diag;
1783 int nextarg;
1784 long offset;
1785
1786 if (raw_smp_processor_id() != kdb_initial_cpu) {
1787 kdb_printf("go must execute on the entry cpu, "
1788 "please use \"cpu %d\" and then execute go\n",
1789 kdb_initial_cpu);
1790 return KDB_BADCPUNUM;
1791 }
1792 if (argc == 1) {
1793 nextarg = 1;
1794 diag = kdbgetaddrarg(argc, argv, &nextarg,
1795 &addr, &offset, NULL);
1796 if (diag)
1797 return diag;
1798 } else if (argc) {
1799 return KDB_ARGCOUNT;
1800 }
1801
1802 diag = KDB_CMD_GO;
1803 if (KDB_FLAG(CATASTROPHIC)) {
1804 kdb_printf("Catastrophic error detected\n");
1805 kdb_printf("kdb_continue_catastrophic=%d, ",
1806 kdb_continue_catastrophic);
1807 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1808 kdb_printf("type go a second time if you really want "
1809 "to continue\n");
1810 return 0;
1811 }
1812 if (kdb_continue_catastrophic == 2) {
1813 kdb_printf("forcing reboot\n");
1814 kdb_reboot(0, NULL);
1815 }
1816 kdb_printf("attempting to continue\n");
1817 }
1818 return diag;
1819}
1820
1821/*
1822 * kdb_rd - This function implements the 'rd' command.
1823 */
1824static int kdb_rd(int argc, const char **argv)
1825{
1826 int len = kdb_check_regs();
1827#if DBG_MAX_REG_NUM > 0
1828 int i;
1829 char *rname;
1830 int rsize;
1831 u64 reg64;
1832 u32 reg32;
1833 u16 reg16;
1834 u8 reg8;
1835
1836 if (len)
1837 return len;
1838
1839 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1840 rsize = dbg_reg_def[i].size * 2;
1841 if (rsize > 16)
1842 rsize = 2;
1843 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1844 len = 0;
1845 kdb_printf("\n");
1846 }
1847 if (len)
1848 len += kdb_printf(" ");
1849 switch(dbg_reg_def[i].size * 8) {
1850 case 8:
1851 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1852 if (!rname)
1853 break;
1854 len += kdb_printf("%s: %02x", rname, reg8);
1855 break;
1856 case 16:
1857 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1858 if (!rname)
1859 break;
1860 len += kdb_printf("%s: %04x", rname, reg16);
1861 break;
1862 case 32:
1863 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1864 if (!rname)
1865 break;
1866 len += kdb_printf("%s: %08x", rname, reg32);
1867 break;
1868 case 64:
1869 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1870 if (!rname)
1871 break;
1872 len += kdb_printf("%s: %016llx", rname, reg64);
1873 break;
1874 default:
1875 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1876 }
1877 }
1878 kdb_printf("\n");
1879#else
1880 if (len)
1881 return len;
1882
1883 kdb_dumpregs(kdb_current_regs);
1884#endif
1885 return 0;
1886}
1887
1888/*
1889 * kdb_rm - This function implements the 'rm' (register modify) command.
1890 * rm register-name new-contents
1891 * Remarks:
1892 * Allows register modification with the same restrictions as gdb
1893 */
1894static int kdb_rm(int argc, const char **argv)
1895{
1896#if DBG_MAX_REG_NUM > 0
1897 int diag;
1898 const char *rname;
1899 int i;
1900 u64 reg64;
1901 u32 reg32;
1902 u16 reg16;
1903 u8 reg8;
1904
1905 if (argc != 2)
1906 return KDB_ARGCOUNT;
1907 /*
1908 * Allow presence or absence of leading '%' symbol.
1909 */
1910 rname = argv[1];
1911 if (*rname == '%')
1912 rname++;
1913
1914 diag = kdbgetu64arg(argv[2], ®64);
1915 if (diag)
1916 return diag;
1917
1918 diag = kdb_check_regs();
1919 if (diag)
1920 return diag;
1921
1922 diag = KDB_BADREG;
1923 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1924 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1925 diag = 0;
1926 break;
1927 }
1928 }
1929 if (!diag) {
1930 switch(dbg_reg_def[i].size * 8) {
1931 case 8:
1932 reg8 = reg64;
1933 dbg_set_reg(i, ®8, kdb_current_regs);
1934 break;
1935 case 16:
1936 reg16 = reg64;
1937 dbg_set_reg(i, ®16, kdb_current_regs);
1938 break;
1939 case 32:
1940 reg32 = reg64;
1941 dbg_set_reg(i, ®32, kdb_current_regs);
1942 break;
1943 case 64:
1944 dbg_set_reg(i, ®64, kdb_current_regs);
1945 break;
1946 }
1947 }
1948 return diag;
1949#else
1950 kdb_printf("ERROR: Register set currently not implemented\n");
1951 return 0;
1952#endif
1953}
1954
1955#if defined(CONFIG_MAGIC_SYSRQ)
1956/*
1957 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1958 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1959 * sr <magic-sysrq-code>
1960 */
1961static int kdb_sr(int argc, const char **argv)
1962{
1963 bool check_mask =
1964 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1965
1966 if (argc != 1)
1967 return KDB_ARGCOUNT;
1968
1969 kdb_trap_printk++;
1970 __handle_sysrq(*argv[1], check_mask);
1971 kdb_trap_printk--;
1972
1973 return 0;
1974}
1975#endif /* CONFIG_MAGIC_SYSRQ */
1976
1977/*
1978 * kdb_ef - This function implements the 'regs' (display exception
1979 * frame) command. This command takes an address and expects to
1980 * find an exception frame at that address, formats and prints
1981 * it.
1982 * regs address-expression
1983 * Remarks:
1984 * Not done yet.
1985 */
1986static int kdb_ef(int argc, const char **argv)
1987{
1988 int diag;
1989 unsigned long addr;
1990 long offset;
1991 int nextarg;
1992
1993 if (argc != 1)
1994 return KDB_ARGCOUNT;
1995
1996 nextarg = 1;
1997 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1998 if (diag)
1999 return diag;
2000 show_regs((struct pt_regs *)addr);
2001 return 0;
2002}
2003
2004#if defined(CONFIG_MODULES)
2005/*
2006 * kdb_lsmod - This function implements the 'lsmod' command. Lists
2007 * currently loaded kernel modules.
2008 * Mostly taken from userland lsmod.
2009 */
2010static int kdb_lsmod(int argc, const char **argv)
2011{
2012 struct module *mod;
2013
2014 if (argc != 0)
2015 return KDB_ARGCOUNT;
2016
2017 kdb_printf("Module Size modstruct Used by\n");
2018 list_for_each_entry(mod, kdb_modules, list) {
2019 if (mod->state == MODULE_STATE_UNFORMED)
2020 continue;
2021
2022 kdb_printf("%-20s%8u 0x%p ", mod->name,
2023 mod->core_layout.size, (void *)mod);
2024#ifdef CONFIG_MODULE_UNLOAD
2025 kdb_printf("%4d ", module_refcount(mod));
2026#endif
2027 if (mod->state == MODULE_STATE_GOING)
2028 kdb_printf(" (Unloading)");
2029 else if (mod->state == MODULE_STATE_COMING)
2030 kdb_printf(" (Loading)");
2031 else
2032 kdb_printf(" (Live)");
2033 kdb_printf(" 0x%p", mod->core_layout.base);
2034
2035#ifdef CONFIG_MODULE_UNLOAD
2036 {
2037 struct module_use *use;
2038 kdb_printf(" [ ");
2039 list_for_each_entry(use, &mod->source_list,
2040 source_list)
2041 kdb_printf("%s ", use->target->name);
2042 kdb_printf("]\n");
2043 }
2044#endif
2045 }
2046
2047 return 0;
2048}
2049
2050#endif /* CONFIG_MODULES */
2051
2052/*
2053 * kdb_env - This function implements the 'env' command. Display the
2054 * current environment variables.
2055 */
2056
2057static int kdb_env(int argc, const char **argv)
2058{
2059 int i;
2060
2061 for (i = 0; i < __nenv; i++) {
2062 if (__env[i])
2063 kdb_printf("%s\n", __env[i]);
2064 }
2065
2066 if (KDB_DEBUG(MASK))
2067 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2068
2069 return 0;
2070}
2071
2072#ifdef CONFIG_PRINTK
2073/*
2074 * kdb_dmesg - This function implements the 'dmesg' command to display
2075 * the contents of the syslog buffer.
2076 * dmesg [lines] [adjust]
2077 */
2078static int kdb_dmesg(int argc, const char **argv)
2079{
2080 int diag;
2081 int logging;
2082 int lines = 0;
2083 int adjust = 0;
2084 int n = 0;
2085 int skip = 0;
2086 struct kmsg_dumper dumper = { .active = 1 };
2087 size_t len;
2088 char buf[201];
2089
2090 if (argc > 2)
2091 return KDB_ARGCOUNT;
2092 if (argc) {
2093 char *cp;
2094 lines = simple_strtol(argv[1], &cp, 0);
2095 if (*cp)
2096 lines = 0;
2097 if (argc > 1) {
2098 adjust = simple_strtoul(argv[2], &cp, 0);
2099 if (*cp || adjust < 0)
2100 adjust = 0;
2101 }
2102 }
2103
2104 /* disable LOGGING if set */
2105 diag = kdbgetintenv("LOGGING", &logging);
2106 if (!diag && logging) {
2107 const char *setargs[] = { "set", "LOGGING", "0" };
2108 kdb_set(2, setargs);
2109 }
2110
2111 kmsg_dump_rewind_nolock(&dumper);
2112 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2113 n++;
2114
2115 if (lines < 0) {
2116 if (adjust >= n)
2117 kdb_printf("buffer only contains %d lines, nothing "
2118 "printed\n", n);
2119 else if (adjust - lines >= n)
2120 kdb_printf("buffer only contains %d lines, last %d "
2121 "lines printed\n", n, n - adjust);
2122 skip = adjust;
2123 lines = abs(lines);
2124 } else if (lines > 0) {
2125 skip = n - lines - adjust;
2126 lines = abs(lines);
2127 if (adjust >= n) {
2128 kdb_printf("buffer only contains %d lines, "
2129 "nothing printed\n", n);
2130 skip = n;
2131 } else if (skip < 0) {
2132 lines += skip;
2133 skip = 0;
2134 kdb_printf("buffer only contains %d lines, first "
2135 "%d lines printed\n", n, lines);
2136 }
2137 } else {
2138 lines = n;
2139 }
2140
2141 if (skip >= n || skip < 0)
2142 return 0;
2143
2144 kmsg_dump_rewind_nolock(&dumper);
2145 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2146 if (skip) {
2147 skip--;
2148 continue;
2149 }
2150 if (!lines--)
2151 break;
2152 if (KDB_FLAG(CMD_INTERRUPT))
2153 return 0;
2154
2155 kdb_printf("%.*s\n", (int)len - 1, buf);
2156 }
2157
2158 return 0;
2159}
2160#endif /* CONFIG_PRINTK */
2161
2162/* Make sure we balance enable/disable calls, must disable first. */
2163static atomic_t kdb_nmi_disabled;
2164
2165static int kdb_disable_nmi(int argc, const char *argv[])
2166{
2167 if (atomic_read(&kdb_nmi_disabled))
2168 return 0;
2169 atomic_set(&kdb_nmi_disabled, 1);
2170 arch_kgdb_ops.enable_nmi(0);
2171 return 0;
2172}
2173
2174static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2175{
2176 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2177 return -EINVAL;
2178 arch_kgdb_ops.enable_nmi(1);
2179 return 0;
2180}
2181
2182static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2183 .set = kdb_param_enable_nmi,
2184};
2185module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2186
2187/*
2188 * kdb_cpu - This function implements the 'cpu' command.
2189 * cpu [<cpunum>]
2190 * Returns:
2191 * KDB_CMD_CPU for success, a kdb diagnostic if error
2192 */
2193static void kdb_cpu_status(void)
2194{
2195 int i, start_cpu, first_print = 1;
2196 char state, prev_state = '?';
2197
2198 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2199 kdb_printf("Available cpus: ");
2200 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2201 if (!cpu_online(i)) {
2202 state = 'F'; /* cpu is offline */
2203 } else if (!kgdb_info[i].enter_kgdb) {
2204 state = 'D'; /* cpu is online but unresponsive */
2205 } else {
2206 state = ' '; /* cpu is responding to kdb */
2207 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2208 state = 'I'; /* idle task */
2209 }
2210 if (state != prev_state) {
2211 if (prev_state != '?') {
2212 if (!first_print)
2213 kdb_printf(", ");
2214 first_print = 0;
2215 kdb_printf("%d", start_cpu);
2216 if (start_cpu < i-1)
2217 kdb_printf("-%d", i-1);
2218 if (prev_state != ' ')
2219 kdb_printf("(%c)", prev_state);
2220 }
2221 prev_state = state;
2222 start_cpu = i;
2223 }
2224 }
2225 /* print the trailing cpus, ignoring them if they are all offline */
2226 if (prev_state != 'F') {
2227 if (!first_print)
2228 kdb_printf(", ");
2229 kdb_printf("%d", start_cpu);
2230 if (start_cpu < i-1)
2231 kdb_printf("-%d", i-1);
2232 if (prev_state != ' ')
2233 kdb_printf("(%c)", prev_state);
2234 }
2235 kdb_printf("\n");
2236}
2237
2238static int kdb_cpu(int argc, const char **argv)
2239{
2240 unsigned long cpunum;
2241 int diag;
2242
2243 if (argc == 0) {
2244 kdb_cpu_status();
2245 return 0;
2246 }
2247
2248 if (argc != 1)
2249 return KDB_ARGCOUNT;
2250
2251 diag = kdbgetularg(argv[1], &cpunum);
2252 if (diag)
2253 return diag;
2254
2255 /*
2256 * Validate cpunum
2257 */
2258 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2259 return KDB_BADCPUNUM;
2260
2261 dbg_switch_cpu = cpunum;
2262
2263 /*
2264 * Switch to other cpu
2265 */
2266 return KDB_CMD_CPU;
2267}
2268
2269/* The user may not realize that ps/bta with no parameters does not print idle
2270 * or sleeping system daemon processes, so tell them how many were suppressed.
2271 */
2272void kdb_ps_suppressed(void)
2273{
2274 int idle = 0, daemon = 0;
2275 unsigned long mask_I = kdb_task_state_string("I"),
2276 mask_M = kdb_task_state_string("M");
2277 unsigned long cpu;
2278 const struct task_struct *p, *g;
2279 for_each_online_cpu(cpu) {
2280 p = kdb_curr_task(cpu);
2281 if (kdb_task_state(p, mask_I))
2282 ++idle;
2283 }
2284 kdb_do_each_thread(g, p) {
2285 if (kdb_task_state(p, mask_M))
2286 ++daemon;
2287 } kdb_while_each_thread(g, p);
2288 if (idle || daemon) {
2289 if (idle)
2290 kdb_printf("%d idle process%s (state I)%s\n",
2291 idle, idle == 1 ? "" : "es",
2292 daemon ? " and " : "");
2293 if (daemon)
2294 kdb_printf("%d sleeping system daemon (state M) "
2295 "process%s", daemon,
2296 daemon == 1 ? "" : "es");
2297 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2298 }
2299}
2300
2301/*
2302 * kdb_ps - This function implements the 'ps' command which shows a
2303 * list of the active processes.
2304 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2305 */
2306void kdb_ps1(const struct task_struct *p)
2307{
2308 int cpu;
2309 unsigned long tmp;
2310
2311 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2312 return;
2313
2314 cpu = kdb_process_cpu(p);
2315 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2316 (void *)p, p->pid, p->parent->pid,
2317 kdb_task_has_cpu(p), kdb_process_cpu(p),
2318 kdb_task_state_char(p),
2319 (void *)(&p->thread),
2320 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2321 p->comm);
2322 if (kdb_task_has_cpu(p)) {
2323 if (!KDB_TSK(cpu)) {
2324 kdb_printf(" Error: no saved data for this cpu\n");
2325 } else {
2326 if (KDB_TSK(cpu) != p)
2327 kdb_printf(" Error: does not match running "
2328 "process table (0x%p)\n", KDB_TSK(cpu));
2329 }
2330 }
2331}
2332
2333static int kdb_ps(int argc, const char **argv)
2334{
2335 struct task_struct *g, *p;
2336 unsigned long mask, cpu;
2337
2338 if (argc == 0)
2339 kdb_ps_suppressed();
2340 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2341 (int)(2*sizeof(void *))+2, "Task Addr",
2342 (int)(2*sizeof(void *))+2, "Thread");
2343 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2344 /* Run the active tasks first */
2345 for_each_online_cpu(cpu) {
2346 if (KDB_FLAG(CMD_INTERRUPT))
2347 return 0;
2348 p = kdb_curr_task(cpu);
2349 if (kdb_task_state(p, mask))
2350 kdb_ps1(p);
2351 }
2352 kdb_printf("\n");
2353 /* Now the real tasks */
2354 kdb_do_each_thread(g, p) {
2355 if (KDB_FLAG(CMD_INTERRUPT))
2356 return 0;
2357 if (kdb_task_state(p, mask))
2358 kdb_ps1(p);
2359 } kdb_while_each_thread(g, p);
2360
2361 return 0;
2362}
2363
2364/*
2365 * kdb_pid - This function implements the 'pid' command which switches
2366 * the currently active process.
2367 * pid [<pid> | R]
2368 */
2369static int kdb_pid(int argc, const char **argv)
2370{
2371 struct task_struct *p;
2372 unsigned long val;
2373 int diag;
2374
2375 if (argc > 1)
2376 return KDB_ARGCOUNT;
2377
2378 if (argc) {
2379 if (strcmp(argv[1], "R") == 0) {
2380 p = KDB_TSK(kdb_initial_cpu);
2381 } else {
2382 diag = kdbgetularg(argv[1], &val);
2383 if (diag)
2384 return KDB_BADINT;
2385
2386 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2387 if (!p) {
2388 kdb_printf("No task with pid=%d\n", (pid_t)val);
2389 return 0;
2390 }
2391 }
2392 kdb_set_current_task(p);
2393 }
2394 kdb_printf("KDB current process is %s(pid=%d)\n",
2395 kdb_current_task->comm,
2396 kdb_current_task->pid);
2397
2398 return 0;
2399}
2400
2401static int kdb_kgdb(int argc, const char **argv)
2402{
2403 return KDB_CMD_KGDB;
2404}
2405
2406/*
2407 * kdb_help - This function implements the 'help' and '?' commands.
2408 */
2409static int kdb_help(int argc, const char **argv)
2410{
2411 kdbtab_t *kt;
2412 int i;
2413
2414 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2415 kdb_printf("-----------------------------"
2416 "-----------------------------\n");
2417 for_each_kdbcmd(kt, i) {
2418 char *space = "";
2419 if (KDB_FLAG(CMD_INTERRUPT))
2420 return 0;
2421 if (!kt->cmd_name)
2422 continue;
2423 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2424 continue;
2425 if (strlen(kt->cmd_usage) > 20)
2426 space = "\n ";
2427 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2428 kt->cmd_usage, space, kt->cmd_help);
2429 }
2430 return 0;
2431}
2432
2433/*
2434 * kdb_kill - This function implements the 'kill' commands.
2435 */
2436static int kdb_kill(int argc, const char **argv)
2437{
2438 long sig, pid;
2439 char *endp;
2440 struct task_struct *p;
2441 struct siginfo info;
2442
2443 if (argc != 2)
2444 return KDB_ARGCOUNT;
2445
2446 sig = simple_strtol(argv[1], &endp, 0);
2447 if (*endp)
2448 return KDB_BADINT;
2449 if (sig >= 0) {
2450 kdb_printf("Invalid signal parameter.<-signal>\n");
2451 return 0;
2452 }
2453 sig = -sig;
2454
2455 pid = simple_strtol(argv[2], &endp, 0);
2456 if (*endp)
2457 return KDB_BADINT;
2458 if (pid <= 0) {
2459 kdb_printf("Process ID must be large than 0.\n");
2460 return 0;
2461 }
2462
2463 /* Find the process. */
2464 p = find_task_by_pid_ns(pid, &init_pid_ns);
2465 if (!p) {
2466 kdb_printf("The specified process isn't found.\n");
2467 return 0;
2468 }
2469 p = p->group_leader;
2470 info.si_signo = sig;
2471 info.si_errno = 0;
2472 info.si_code = SI_USER;
2473 info.si_pid = pid; /* same capabilities as process being signalled */
2474 info.si_uid = 0; /* kdb has root authority */
2475 kdb_send_sig_info(p, &info);
2476 return 0;
2477}
2478
2479struct kdb_tm {
2480 int tm_sec; /* seconds */
2481 int tm_min; /* minutes */
2482 int tm_hour; /* hours */
2483 int tm_mday; /* day of the month */
2484 int tm_mon; /* month */
2485 int tm_year; /* year */
2486};
2487
2488static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2489{
2490 /* This will work from 1970-2099, 2100 is not a leap year */
2491 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2492 31, 30, 31, 30, 31 };
2493 memset(tm, 0, sizeof(*tm));
2494 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2495 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2496 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2497 tm->tm_min = tm->tm_sec / 60 % 60;
2498 tm->tm_hour = tm->tm_sec / 60 / 60;
2499 tm->tm_sec = tm->tm_sec % 60;
2500 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2501 tm->tm_mday %= (4*365+1);
2502 mon_day[1] = 29;
2503 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2504 tm->tm_mday -= mon_day[tm->tm_mon];
2505 if (++tm->tm_mon == 12) {
2506 tm->tm_mon = 0;
2507 ++tm->tm_year;
2508 mon_day[1] = 28;
2509 }
2510 }
2511 ++tm->tm_mday;
2512}
2513
2514/*
2515 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2516 * I cannot call that code directly from kdb, it has an unconditional
2517 * cli()/sti() and calls routines that take locks which can stop the debugger.
2518 */
2519static void kdb_sysinfo(struct sysinfo *val)
2520{
2521 struct timespec uptime;
2522 ktime_get_ts(&uptime);
2523 memset(val, 0, sizeof(*val));
2524 val->uptime = uptime.tv_sec;
2525 val->loads[0] = avenrun[0];
2526 val->loads[1] = avenrun[1];
2527 val->loads[2] = avenrun[2];
2528 val->procs = nr_threads-1;
2529 si_meminfo(val);
2530
2531 return;
2532}
2533
2534/*
2535 * kdb_summary - This function implements the 'summary' command.
2536 */
2537static int kdb_summary(int argc, const char **argv)
2538{
2539 struct timespec now;
2540 struct kdb_tm tm;
2541 struct sysinfo val;
2542
2543 if (argc)
2544 return KDB_ARGCOUNT;
2545
2546 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2547 kdb_printf("release %s\n", init_uts_ns.name.release);
2548 kdb_printf("version %s\n", init_uts_ns.name.version);
2549 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2550 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2551 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2552 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2553
2554 now = __current_kernel_time();
2555 kdb_gmtime(&now, &tm);
2556 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2557 "tz_minuteswest %d\n",
2558 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2559 tm.tm_hour, tm.tm_min, tm.tm_sec,
2560 sys_tz.tz_minuteswest);
2561
2562 kdb_sysinfo(&val);
2563 kdb_printf("uptime ");
2564 if (val.uptime > (24*60*60)) {
2565 int days = val.uptime / (24*60*60);
2566 val.uptime %= (24*60*60);
2567 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2568 }
2569 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2570
2571 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2572
2573#define LOAD_INT(x) ((x) >> FSHIFT)
2574#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2575 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2576 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2577 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2578 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2579#undef LOAD_INT
2580#undef LOAD_FRAC
2581 /* Display in kilobytes */
2582#define K(x) ((x) << (PAGE_SHIFT - 10))
2583 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2584 "Buffers: %8lu kB\n",
2585 K(val.totalram), K(val.freeram), K(val.bufferram));
2586 return 0;
2587}
2588
2589/*
2590 * kdb_per_cpu - This function implements the 'per_cpu' command.
2591 */
2592static int kdb_per_cpu(int argc, const char **argv)
2593{
2594 char fmtstr[64];
2595 int cpu, diag, nextarg = 1;
2596 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2597
2598 if (argc < 1 || argc > 3)
2599 return KDB_ARGCOUNT;
2600
2601 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2602 if (diag)
2603 return diag;
2604
2605 if (argc >= 2) {
2606 diag = kdbgetularg(argv[2], &bytesperword);
2607 if (diag)
2608 return diag;
2609 }
2610 if (!bytesperword)
2611 bytesperword = KDB_WORD_SIZE;
2612 else if (bytesperword > KDB_WORD_SIZE)
2613 return KDB_BADWIDTH;
2614 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2615 if (argc >= 3) {
2616 diag = kdbgetularg(argv[3], &whichcpu);
2617 if (diag)
2618 return diag;
2619 if (!cpu_online(whichcpu)) {
2620 kdb_printf("cpu %ld is not online\n", whichcpu);
2621 return KDB_BADCPUNUM;
2622 }
2623 }
2624
2625 /* Most architectures use __per_cpu_offset[cpu], some use
2626 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2627 */
2628#ifdef __per_cpu_offset
2629#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2630#else
2631#ifdef CONFIG_SMP
2632#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2633#else
2634#define KDB_PCU(cpu) 0
2635#endif
2636#endif
2637 for_each_online_cpu(cpu) {
2638 if (KDB_FLAG(CMD_INTERRUPT))
2639 return 0;
2640
2641 if (whichcpu != ~0UL && whichcpu != cpu)
2642 continue;
2643 addr = symaddr + KDB_PCU(cpu);
2644 diag = kdb_getword(&val, addr, bytesperword);
2645 if (diag) {
2646 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2647 "read, diag=%d\n", cpu, addr, diag);
2648 continue;
2649 }
2650 kdb_printf("%5d ", cpu);
2651 kdb_md_line(fmtstr, addr,
2652 bytesperword == KDB_WORD_SIZE,
2653 1, bytesperword, 1, 1, 0);
2654 }
2655#undef KDB_PCU
2656 return 0;
2657}
2658
2659/*
2660 * display help for the use of cmd | grep pattern
2661 */
2662static int kdb_grep_help(int argc, const char **argv)
2663{
2664 kdb_printf("Usage of cmd args | grep pattern:\n");
2665 kdb_printf(" Any command's output may be filtered through an ");
2666 kdb_printf("emulated 'pipe'.\n");
2667 kdb_printf(" 'grep' is just a key word.\n");
2668 kdb_printf(" The pattern may include a very limited set of "
2669 "metacharacters:\n");
2670 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2671 kdb_printf(" And if there are spaces in the pattern, you may "
2672 "quote it:\n");
2673 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2674 " or \"^pat tern$\"\n");
2675 return 0;
2676}
2677
2678/*
2679 * kdb_register_flags - This function is used to register a kernel
2680 * debugger command.
2681 * Inputs:
2682 * cmd Command name
2683 * func Function to execute the command
2684 * usage A simple usage string showing arguments
2685 * help A simple help string describing command
2686 * repeat Does the command auto repeat on enter?
2687 * Returns:
2688 * zero for success, one if a duplicate command.
2689 */
2690#define kdb_command_extend 50 /* arbitrary */
2691int kdb_register_flags(char *cmd,
2692 kdb_func_t func,
2693 char *usage,
2694 char *help,
2695 short minlen,
2696 kdb_cmdflags_t flags)
2697{
2698 int i;
2699 kdbtab_t *kp;
2700
2701 /*
2702 * Brute force method to determine duplicates
2703 */
2704 for_each_kdbcmd(kp, i) {
2705 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2706 kdb_printf("Duplicate kdb command registered: "
2707 "%s, func %p help %s\n", cmd, func, help);
2708 return 1;
2709 }
2710 }
2711
2712 /*
2713 * Insert command into first available location in table
2714 */
2715 for_each_kdbcmd(kp, i) {
2716 if (kp->cmd_name == NULL)
2717 break;
2718 }
2719
2720 if (i >= kdb_max_commands) {
2721 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2722 kdb_command_extend) * sizeof(*new), GFP_KDB);
2723 if (!new) {
2724 kdb_printf("Could not allocate new kdb_command "
2725 "table\n");
2726 return 1;
2727 }
2728 if (kdb_commands) {
2729 memcpy(new, kdb_commands,
2730 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2731 kfree(kdb_commands);
2732 }
2733 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2734 kdb_command_extend * sizeof(*new));
2735 kdb_commands = new;
2736 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2737 kdb_max_commands += kdb_command_extend;
2738 }
2739
2740 kp->cmd_name = cmd;
2741 kp->cmd_func = func;
2742 kp->cmd_usage = usage;
2743 kp->cmd_help = help;
2744 kp->cmd_minlen = minlen;
2745 kp->cmd_flags = flags;
2746
2747 return 0;
2748}
2749EXPORT_SYMBOL_GPL(kdb_register_flags);
2750
2751
2752/*
2753 * kdb_register - Compatibility register function for commands that do
2754 * not need to specify a repeat state. Equivalent to
2755 * kdb_register_flags with flags set to 0.
2756 * Inputs:
2757 * cmd Command name
2758 * func Function to execute the command
2759 * usage A simple usage string showing arguments
2760 * help A simple help string describing command
2761 * Returns:
2762 * zero for success, one if a duplicate command.
2763 */
2764int kdb_register(char *cmd,
2765 kdb_func_t func,
2766 char *usage,
2767 char *help,
2768 short minlen)
2769{
2770 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2771}
2772EXPORT_SYMBOL_GPL(kdb_register);
2773
2774/*
2775 * kdb_unregister - This function is used to unregister a kernel
2776 * debugger command. It is generally called when a module which
2777 * implements kdb commands is unloaded.
2778 * Inputs:
2779 * cmd Command name
2780 * Returns:
2781 * zero for success, one command not registered.
2782 */
2783int kdb_unregister(char *cmd)
2784{
2785 int i;
2786 kdbtab_t *kp;
2787
2788 /*
2789 * find the command.
2790 */
2791 for_each_kdbcmd(kp, i) {
2792 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2793 kp->cmd_name = NULL;
2794 return 0;
2795 }
2796 }
2797
2798 /* Couldn't find it. */
2799 return 1;
2800}
2801EXPORT_SYMBOL_GPL(kdb_unregister);
2802
2803/* Initialize the kdb command table. */
2804static void __init kdb_inittab(void)
2805{
2806 int i;
2807 kdbtab_t *kp;
2808
2809 for_each_kdbcmd(kp, i)
2810 kp->cmd_name = NULL;
2811
2812 kdb_register_flags("md", kdb_md, "<vaddr>",
2813 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2814 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2815 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2816 "Display Raw Memory", 0,
2817 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2818 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2819 "Display Physical Memory", 0,
2820 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2821 kdb_register_flags("mds", kdb_md, "<vaddr>",
2822 "Display Memory Symbolically", 0,
2823 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2824 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2825 "Modify Memory Contents", 0,
2826 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2827 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2828 "Continue Execution", 1,
2829 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2830 kdb_register_flags("rd", kdb_rd, "",
2831 "Display Registers", 0,
2832 KDB_ENABLE_REG_READ);
2833 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2834 "Modify Registers", 0,
2835 KDB_ENABLE_REG_WRITE);
2836 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2837 "Display exception frame", 0,
2838 KDB_ENABLE_MEM_READ);
2839 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2840 "Stack traceback", 1,
2841 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2842 kdb_register_flags("btp", kdb_bt, "<pid>",
2843 "Display stack for process <pid>", 0,
2844 KDB_ENABLE_INSPECT);
2845 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2846 "Backtrace all processes matching state flag", 0,
2847 KDB_ENABLE_INSPECT);
2848 kdb_register_flags("btc", kdb_bt, "",
2849 "Backtrace current process on each cpu", 0,
2850 KDB_ENABLE_INSPECT);
2851 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2852 "Backtrace process given its struct task address", 0,
2853 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2854 kdb_register_flags("env", kdb_env, "",
2855 "Show environment variables", 0,
2856 KDB_ENABLE_ALWAYS_SAFE);
2857 kdb_register_flags("set", kdb_set, "",
2858 "Set environment variables", 0,
2859 KDB_ENABLE_ALWAYS_SAFE);
2860 kdb_register_flags("help", kdb_help, "",
2861 "Display Help Message", 1,
2862 KDB_ENABLE_ALWAYS_SAFE);
2863 kdb_register_flags("?", kdb_help, "",
2864 "Display Help Message", 0,
2865 KDB_ENABLE_ALWAYS_SAFE);
2866 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2867 "Switch to new cpu", 0,
2868 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2869 kdb_register_flags("kgdb", kdb_kgdb, "",
2870 "Enter kgdb mode", 0, 0);
2871 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2872 "Display active task list", 0,
2873 KDB_ENABLE_INSPECT);
2874 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2875 "Switch to another task", 0,
2876 KDB_ENABLE_INSPECT);
2877 kdb_register_flags("reboot", kdb_reboot, "",
2878 "Reboot the machine immediately", 0,
2879 KDB_ENABLE_REBOOT);
2880#if defined(CONFIG_MODULES)
2881 kdb_register_flags("lsmod", kdb_lsmod, "",
2882 "List loaded kernel modules", 0,
2883 KDB_ENABLE_INSPECT);
2884#endif
2885#if defined(CONFIG_MAGIC_SYSRQ)
2886 kdb_register_flags("sr", kdb_sr, "<key>",
2887 "Magic SysRq key", 0,
2888 KDB_ENABLE_ALWAYS_SAFE);
2889#endif
2890#if defined(CONFIG_PRINTK)
2891 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2892 "Display syslog buffer", 0,
2893 KDB_ENABLE_ALWAYS_SAFE);
2894#endif
2895 if (arch_kgdb_ops.enable_nmi) {
2896 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2897 "Disable NMI entry to KDB", 0,
2898 KDB_ENABLE_ALWAYS_SAFE);
2899 }
2900 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2901 "Define a set of commands, down to endefcmd", 0,
2902 KDB_ENABLE_ALWAYS_SAFE);
2903 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2904 "Send a signal to a process", 0,
2905 KDB_ENABLE_SIGNAL);
2906 kdb_register_flags("summary", kdb_summary, "",
2907 "Summarize the system", 4,
2908 KDB_ENABLE_ALWAYS_SAFE);
2909 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2910 "Display per_cpu variables", 3,
2911 KDB_ENABLE_MEM_READ);
2912 kdb_register_flags("grephelp", kdb_grep_help, "",
2913 "Display help on | grep", 0,
2914 KDB_ENABLE_ALWAYS_SAFE);
2915}
2916
2917/* Execute any commands defined in kdb_cmds. */
2918static void __init kdb_cmd_init(void)
2919{
2920 int i, diag;
2921 for (i = 0; kdb_cmds[i]; ++i) {
2922 diag = kdb_parse(kdb_cmds[i]);
2923 if (diag)
2924 kdb_printf("kdb command %s failed, kdb diag %d\n",
2925 kdb_cmds[i], diag);
2926 }
2927 if (defcmd_in_progress) {
2928 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2929 kdb_parse("endefcmd");
2930 }
2931}
2932
2933/* Initialize kdb_printf, breakpoint tables and kdb state */
2934void __init kdb_init(int lvl)
2935{
2936 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2937 int i;
2938
2939 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2940 return;
2941 for (i = kdb_init_lvl; i < lvl; i++) {
2942 switch (i) {
2943 case KDB_NOT_INITIALIZED:
2944 kdb_inittab(); /* Initialize Command Table */
2945 kdb_initbptab(); /* Initialize Breakpoints */
2946 break;
2947 case KDB_INIT_EARLY:
2948 kdb_cmd_init(); /* Build kdb_cmds tables */
2949 break;
2950 }
2951 }
2952 kdb_init_lvl = lvl;
2953}
1/*
2 * Kernel Debugger Architecture Independent Main Code
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved.
9 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
10 * Xscale (R) modifications copyright (C) 2003 Intel Corporation.
11 * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
12 */
13
14#include <linux/ctype.h>
15#include <linux/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sched/loadavg.h>
22#include <linux/sched/stat.h>
23#include <linux/sched/debug.h>
24#include <linux/sysrq.h>
25#include <linux/smp.h>
26#include <linux/utsname.h>
27#include <linux/vmalloc.h>
28#include <linux/atomic.h>
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/mm.h>
32#include <linux/init.h>
33#include <linux/kallsyms.h>
34#include <linux/kgdb.h>
35#include <linux/kdb.h>
36#include <linux/notifier.h>
37#include <linux/interrupt.h>
38#include <linux/delay.h>
39#include <linux/nmi.h>
40#include <linux/time.h>
41#include <linux/ptrace.h>
42#include <linux/sysctl.h>
43#include <linux/cpu.h>
44#include <linux/kdebug.h>
45#include <linux/proc_fs.h>
46#include <linux/uaccess.h>
47#include <linux/slab.h>
48#include "kdb_private.h"
49
50#undef MODULE_PARAM_PREFIX
51#define MODULE_PARAM_PREFIX "kdb."
52
53static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
54module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
55
56char kdb_grep_string[KDB_GREP_STRLEN];
57int kdb_grepping_flag;
58EXPORT_SYMBOL(kdb_grepping_flag);
59int kdb_grep_leading;
60int kdb_grep_trailing;
61
62/*
63 * Kernel debugger state flags
64 */
65int kdb_flags;
66
67/*
68 * kdb_lock protects updates to kdb_initial_cpu. Used to
69 * single thread processors through the kernel debugger.
70 */
71int kdb_initial_cpu = -1; /* cpu number that owns kdb */
72int kdb_nextline = 1;
73int kdb_state; /* General KDB state */
74
75struct task_struct *kdb_current_task;
76EXPORT_SYMBOL(kdb_current_task);
77struct pt_regs *kdb_current_regs;
78
79const char *kdb_diemsg;
80static int kdb_go_count;
81#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
82static unsigned int kdb_continue_catastrophic =
83 CONFIG_KDB_CONTINUE_CATASTROPHIC;
84#else
85static unsigned int kdb_continue_catastrophic;
86#endif
87
88/* kdb_commands describes the available commands. */
89static kdbtab_t *kdb_commands;
90#define KDB_BASE_CMD_MAX 50
91static int kdb_max_commands = KDB_BASE_CMD_MAX;
92static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
93#define for_each_kdbcmd(cmd, num) \
94 for ((cmd) = kdb_base_commands, (num) = 0; \
95 num < kdb_max_commands; \
96 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
97
98typedef struct _kdbmsg {
99 int km_diag; /* kdb diagnostic */
100 char *km_msg; /* Corresponding message text */
101} kdbmsg_t;
102
103#define KDBMSG(msgnum, text) \
104 { KDB_##msgnum, text }
105
106static kdbmsg_t kdbmsgs[] = {
107 KDBMSG(NOTFOUND, "Command Not Found"),
108 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
109 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
110 "8 is only allowed on 64 bit systems"),
111 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
112 KDBMSG(NOTENV, "Cannot find environment variable"),
113 KDBMSG(NOENVVALUE, "Environment variable should have value"),
114 KDBMSG(NOTIMP, "Command not implemented"),
115 KDBMSG(ENVFULL, "Environment full"),
116 KDBMSG(ENVBUFFULL, "Environment buffer full"),
117 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
118#ifdef CONFIG_CPU_XSCALE
119 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
120#else
121 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
122#endif
123 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
124 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
125 KDBMSG(BADMODE, "Invalid IDMODE"),
126 KDBMSG(BADINT, "Illegal numeric value"),
127 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
128 KDBMSG(BADREG, "Invalid register name"),
129 KDBMSG(BADCPUNUM, "Invalid cpu number"),
130 KDBMSG(BADLENGTH, "Invalid length field"),
131 KDBMSG(NOBP, "No Breakpoint exists"),
132 KDBMSG(BADADDR, "Invalid address"),
133 KDBMSG(NOPERM, "Permission denied"),
134};
135#undef KDBMSG
136
137static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
138
139
140/*
141 * Initial environment. This is all kept static and local to
142 * this file. We don't want to rely on the memory allocation
143 * mechanisms in the kernel, so we use a very limited allocate-only
144 * heap for new and altered environment variables. The entire
145 * environment is limited to a fixed number of entries (add more
146 * to __env[] if required) and a fixed amount of heap (add more to
147 * KDB_ENVBUFSIZE if required).
148 */
149
150static char *__env[] = {
151#if defined(CONFIG_SMP)
152 "PROMPT=[%d]kdb> ",
153#else
154 "PROMPT=kdb> ",
155#endif
156 "MOREPROMPT=more> ",
157 "RADIX=16",
158 "MDCOUNT=8", /* lines of md output */
159 KDB_PLATFORM_ENV,
160 "DTABCOUNT=30",
161 "NOSECT=1",
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176 (char *)0,
177 (char *)0,
178 (char *)0,
179 (char *)0,
180 (char *)0,
181 (char *)0,
182 (char *)0,
183 (char *)0,
184 (char *)0,
185 (char *)0,
186};
187
188static const int __nenv = ARRAY_SIZE(__env);
189
190struct task_struct *kdb_curr_task(int cpu)
191{
192 struct task_struct *p = curr_task(cpu);
193#ifdef _TIF_MCA_INIT
194 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
195 p = krp->p;
196#endif
197 return p;
198}
199
200/*
201 * Check whether the flags of the current command and the permissions
202 * of the kdb console has allow a command to be run.
203 */
204static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
205 bool no_args)
206{
207 /* permissions comes from userspace so needs massaging slightly */
208 permissions &= KDB_ENABLE_MASK;
209 permissions |= KDB_ENABLE_ALWAYS_SAFE;
210
211 /* some commands change group when launched with no arguments */
212 if (no_args)
213 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
214
215 flags |= KDB_ENABLE_ALL;
216
217 return permissions & flags;
218}
219
220/*
221 * kdbgetenv - This function will return the character string value of
222 * an environment variable.
223 * Parameters:
224 * match A character string representing an environment variable.
225 * Returns:
226 * NULL No environment variable matches 'match'
227 * char* Pointer to string value of environment variable.
228 */
229char *kdbgetenv(const char *match)
230{
231 char **ep = __env;
232 int matchlen = strlen(match);
233 int i;
234
235 for (i = 0; i < __nenv; i++) {
236 char *e = *ep++;
237
238 if (!e)
239 continue;
240
241 if ((strncmp(match, e, matchlen) == 0)
242 && ((e[matchlen] == '\0')
243 || (e[matchlen] == '='))) {
244 char *cp = strchr(e, '=');
245 return cp ? ++cp : "";
246 }
247 }
248 return NULL;
249}
250
251/*
252 * kdballocenv - This function is used to allocate bytes for
253 * environment entries.
254 * Parameters:
255 * match A character string representing a numeric value
256 * Outputs:
257 * *value the unsigned long representation of the env variable 'match'
258 * Returns:
259 * Zero on success, a kdb diagnostic on failure.
260 * Remarks:
261 * We use a static environment buffer (envbuffer) to hold the values
262 * of dynamically generated environment variables (see kdb_set). Buffer
263 * space once allocated is never free'd, so over time, the amount of space
264 * (currently 512 bytes) will be exhausted if env variables are changed
265 * frequently.
266 */
267static char *kdballocenv(size_t bytes)
268{
269#define KDB_ENVBUFSIZE 512
270 static char envbuffer[KDB_ENVBUFSIZE];
271 static int envbufsize;
272 char *ep = NULL;
273
274 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
275 ep = &envbuffer[envbufsize];
276 envbufsize += bytes;
277 }
278 return ep;
279}
280
281/*
282 * kdbgetulenv - This function will return the value of an unsigned
283 * long-valued environment variable.
284 * Parameters:
285 * match A character string representing a numeric value
286 * Outputs:
287 * *value the unsigned long represntation of the env variable 'match'
288 * Returns:
289 * Zero on success, a kdb diagnostic on failure.
290 */
291static int kdbgetulenv(const char *match, unsigned long *value)
292{
293 char *ep;
294
295 ep = kdbgetenv(match);
296 if (!ep)
297 return KDB_NOTENV;
298 if (strlen(ep) == 0)
299 return KDB_NOENVVALUE;
300
301 *value = simple_strtoul(ep, NULL, 0);
302
303 return 0;
304}
305
306/*
307 * kdbgetintenv - This function will return the value of an
308 * integer-valued environment variable.
309 * Parameters:
310 * match A character string representing an integer-valued env variable
311 * Outputs:
312 * *value the integer representation of the environment variable 'match'
313 * Returns:
314 * Zero on success, a kdb diagnostic on failure.
315 */
316int kdbgetintenv(const char *match, int *value)
317{
318 unsigned long val;
319 int diag;
320
321 diag = kdbgetulenv(match, &val);
322 if (!diag)
323 *value = (int) val;
324 return diag;
325}
326
327/*
328 * kdbgetularg - This function will convert a numeric string into an
329 * unsigned long value.
330 * Parameters:
331 * arg A character string representing a numeric value
332 * Outputs:
333 * *value the unsigned long represntation of arg.
334 * Returns:
335 * Zero on success, a kdb diagnostic on failure.
336 */
337int kdbgetularg(const char *arg, unsigned long *value)
338{
339 char *endp;
340 unsigned long val;
341
342 val = simple_strtoul(arg, &endp, 0);
343
344 if (endp == arg) {
345 /*
346 * Also try base 16, for us folks too lazy to type the
347 * leading 0x...
348 */
349 val = simple_strtoul(arg, &endp, 16);
350 if (endp == arg)
351 return KDB_BADINT;
352 }
353
354 *value = val;
355
356 return 0;
357}
358
359int kdbgetu64arg(const char *arg, u64 *value)
360{
361 char *endp;
362 u64 val;
363
364 val = simple_strtoull(arg, &endp, 0);
365
366 if (endp == arg) {
367
368 val = simple_strtoull(arg, &endp, 16);
369 if (endp == arg)
370 return KDB_BADINT;
371 }
372
373 *value = val;
374
375 return 0;
376}
377
378/*
379 * kdb_set - This function implements the 'set' command. Alter an
380 * existing environment variable or create a new one.
381 */
382int kdb_set(int argc, const char **argv)
383{
384 int i;
385 char *ep;
386 size_t varlen, vallen;
387
388 /*
389 * we can be invoked two ways:
390 * set var=value argv[1]="var", argv[2]="value"
391 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
392 * - if the latter, shift 'em down.
393 */
394 if (argc == 3) {
395 argv[2] = argv[3];
396 argc--;
397 }
398
399 if (argc != 2)
400 return KDB_ARGCOUNT;
401
402 /*
403 * Check for internal variables
404 */
405 if (strcmp(argv[1], "KDBDEBUG") == 0) {
406 unsigned int debugflags;
407 char *cp;
408
409 debugflags = simple_strtoul(argv[2], &cp, 0);
410 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
411 kdb_printf("kdb: illegal debug flags '%s'\n",
412 argv[2]);
413 return 0;
414 }
415 kdb_flags = (kdb_flags &
416 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
417 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
418
419 return 0;
420 }
421
422 /*
423 * Tokenizer squashed the '=' sign. argv[1] is variable
424 * name, argv[2] = value.
425 */
426 varlen = strlen(argv[1]);
427 vallen = strlen(argv[2]);
428 ep = kdballocenv(varlen + vallen + 2);
429 if (ep == (char *)0)
430 return KDB_ENVBUFFULL;
431
432 sprintf(ep, "%s=%s", argv[1], argv[2]);
433
434 ep[varlen+vallen+1] = '\0';
435
436 for (i = 0; i < __nenv; i++) {
437 if (__env[i]
438 && ((strncmp(__env[i], argv[1], varlen) == 0)
439 && ((__env[i][varlen] == '\0')
440 || (__env[i][varlen] == '=')))) {
441 __env[i] = ep;
442 return 0;
443 }
444 }
445
446 /*
447 * Wasn't existing variable. Fit into slot.
448 */
449 for (i = 0; i < __nenv-1; i++) {
450 if (__env[i] == (char *)0) {
451 __env[i] = ep;
452 return 0;
453 }
454 }
455
456 return KDB_ENVFULL;
457}
458
459static int kdb_check_regs(void)
460{
461 if (!kdb_current_regs) {
462 kdb_printf("No current kdb registers."
463 " You may need to select another task\n");
464 return KDB_BADREG;
465 }
466 return 0;
467}
468
469/*
470 * kdbgetaddrarg - This function is responsible for parsing an
471 * address-expression and returning the value of the expression,
472 * symbol name, and offset to the caller.
473 *
474 * The argument may consist of a numeric value (decimal or
475 * hexidecimal), a symbol name, a register name (preceded by the
476 * percent sign), an environment variable with a numeric value
477 * (preceded by a dollar sign) or a simple arithmetic expression
478 * consisting of a symbol name, +/-, and a numeric constant value
479 * (offset).
480 * Parameters:
481 * argc - count of arguments in argv
482 * argv - argument vector
483 * *nextarg - index to next unparsed argument in argv[]
484 * regs - Register state at time of KDB entry
485 * Outputs:
486 * *value - receives the value of the address-expression
487 * *offset - receives the offset specified, if any
488 * *name - receives the symbol name, if any
489 * *nextarg - index to next unparsed argument in argv[]
490 * Returns:
491 * zero is returned on success, a kdb diagnostic code is
492 * returned on error.
493 */
494int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
495 unsigned long *value, long *offset,
496 char **name)
497{
498 unsigned long addr;
499 unsigned long off = 0;
500 int positive;
501 int diag;
502 int found = 0;
503 char *symname;
504 char symbol = '\0';
505 char *cp;
506 kdb_symtab_t symtab;
507
508 /*
509 * If the enable flags prohibit both arbitrary memory access
510 * and flow control then there are no reasonable grounds to
511 * provide symbol lookup.
512 */
513 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
514 kdb_cmd_enabled, false))
515 return KDB_NOPERM;
516
517 /*
518 * Process arguments which follow the following syntax:
519 *
520 * symbol | numeric-address [+/- numeric-offset]
521 * %register
522 * $environment-variable
523 */
524
525 if (*nextarg > argc)
526 return KDB_ARGCOUNT;
527
528 symname = (char *)argv[*nextarg];
529
530 /*
531 * If there is no whitespace between the symbol
532 * or address and the '+' or '-' symbols, we
533 * remember the character and replace it with a
534 * null so the symbol/value can be properly parsed
535 */
536 cp = strpbrk(symname, "+-");
537 if (cp != NULL) {
538 symbol = *cp;
539 *cp++ = '\0';
540 }
541
542 if (symname[0] == '$') {
543 diag = kdbgetulenv(&symname[1], &addr);
544 if (diag)
545 return diag;
546 } else if (symname[0] == '%') {
547 diag = kdb_check_regs();
548 if (diag)
549 return diag;
550 /* Implement register values with % at a later time as it is
551 * arch optional.
552 */
553 return KDB_NOTIMP;
554 } else {
555 found = kdbgetsymval(symname, &symtab);
556 if (found) {
557 addr = symtab.sym_start;
558 } else {
559 diag = kdbgetularg(argv[*nextarg], &addr);
560 if (diag)
561 return diag;
562 }
563 }
564
565 if (!found)
566 found = kdbnearsym(addr, &symtab);
567
568 (*nextarg)++;
569
570 if (name)
571 *name = symname;
572 if (value)
573 *value = addr;
574 if (offset && name && *name)
575 *offset = addr - symtab.sym_start;
576
577 if ((*nextarg > argc)
578 && (symbol == '\0'))
579 return 0;
580
581 /*
582 * check for +/- and offset
583 */
584
585 if (symbol == '\0') {
586 if ((argv[*nextarg][0] != '+')
587 && (argv[*nextarg][0] != '-')) {
588 /*
589 * Not our argument. Return.
590 */
591 return 0;
592 } else {
593 positive = (argv[*nextarg][0] == '+');
594 (*nextarg)++;
595 }
596 } else
597 positive = (symbol == '+');
598
599 /*
600 * Now there must be an offset!
601 */
602 if ((*nextarg > argc)
603 && (symbol == '\0')) {
604 return KDB_INVADDRFMT;
605 }
606
607 if (!symbol) {
608 cp = (char *)argv[*nextarg];
609 (*nextarg)++;
610 }
611
612 diag = kdbgetularg(cp, &off);
613 if (diag)
614 return diag;
615
616 if (!positive)
617 off = -off;
618
619 if (offset)
620 *offset += off;
621
622 if (value)
623 *value += off;
624
625 return 0;
626}
627
628static void kdb_cmderror(int diag)
629{
630 int i;
631
632 if (diag >= 0) {
633 kdb_printf("no error detected (diagnostic is %d)\n", diag);
634 return;
635 }
636
637 for (i = 0; i < __nkdb_err; i++) {
638 if (kdbmsgs[i].km_diag == diag) {
639 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
640 return;
641 }
642 }
643
644 kdb_printf("Unknown diag %d\n", -diag);
645}
646
647/*
648 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
649 * command which defines one command as a set of other commands,
650 * terminated by endefcmd. kdb_defcmd processes the initial
651 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
652 * the following commands until 'endefcmd'.
653 * Inputs:
654 * argc argument count
655 * argv argument vector
656 * Returns:
657 * zero for success, a kdb diagnostic if error
658 */
659struct defcmd_set {
660 int count;
661 int usable;
662 char *name;
663 char *usage;
664 char *help;
665 char **command;
666};
667static struct defcmd_set *defcmd_set;
668static int defcmd_set_count;
669static int defcmd_in_progress;
670
671/* Forward references */
672static int kdb_exec_defcmd(int argc, const char **argv);
673
674static int kdb_defcmd2(const char *cmdstr, const char *argv0)
675{
676 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
677 char **save_command = s->command;
678 if (strcmp(argv0, "endefcmd") == 0) {
679 defcmd_in_progress = 0;
680 if (!s->count)
681 s->usable = 0;
682 if (s->usable)
683 /* macros are always safe because when executed each
684 * internal command re-enters kdb_parse() and is
685 * safety checked individually.
686 */
687 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
688 s->help, 0,
689 KDB_ENABLE_ALWAYS_SAFE);
690 return 0;
691 }
692 if (!s->usable)
693 return KDB_NOTIMP;
694 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
695 if (!s->command) {
696 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
697 cmdstr);
698 s->usable = 0;
699 return KDB_NOTIMP;
700 }
701 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
702 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
703 kfree(save_command);
704 return 0;
705}
706
707static int kdb_defcmd(int argc, const char **argv)
708{
709 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
710 if (defcmd_in_progress) {
711 kdb_printf("kdb: nested defcmd detected, assuming missing "
712 "endefcmd\n");
713 kdb_defcmd2("endefcmd", "endefcmd");
714 }
715 if (argc == 0) {
716 int i;
717 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
718 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
719 s->usage, s->help);
720 for (i = 0; i < s->count; ++i)
721 kdb_printf("%s", s->command[i]);
722 kdb_printf("endefcmd\n");
723 }
724 return 0;
725 }
726 if (argc != 3)
727 return KDB_ARGCOUNT;
728 if (in_dbg_master()) {
729 kdb_printf("Command only available during kdb_init()\n");
730 return KDB_NOTIMP;
731 }
732 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
733 GFP_KDB);
734 if (!defcmd_set)
735 goto fail_defcmd;
736 memcpy(defcmd_set, save_defcmd_set,
737 defcmd_set_count * sizeof(*defcmd_set));
738 s = defcmd_set + defcmd_set_count;
739 memset(s, 0, sizeof(*s));
740 s->usable = 1;
741 s->name = kdb_strdup(argv[1], GFP_KDB);
742 if (!s->name)
743 goto fail_name;
744 s->usage = kdb_strdup(argv[2], GFP_KDB);
745 if (!s->usage)
746 goto fail_usage;
747 s->help = kdb_strdup(argv[3], GFP_KDB);
748 if (!s->help)
749 goto fail_help;
750 if (s->usage[0] == '"') {
751 strcpy(s->usage, argv[2]+1);
752 s->usage[strlen(s->usage)-1] = '\0';
753 }
754 if (s->help[0] == '"') {
755 strcpy(s->help, argv[3]+1);
756 s->help[strlen(s->help)-1] = '\0';
757 }
758 ++defcmd_set_count;
759 defcmd_in_progress = 1;
760 kfree(save_defcmd_set);
761 return 0;
762fail_help:
763 kfree(s->usage);
764fail_usage:
765 kfree(s->name);
766fail_name:
767 kfree(defcmd_set);
768fail_defcmd:
769 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
770 defcmd_set = save_defcmd_set;
771 return KDB_NOTIMP;
772}
773
774/*
775 * kdb_exec_defcmd - Execute the set of commands associated with this
776 * defcmd name.
777 * Inputs:
778 * argc argument count
779 * argv argument vector
780 * Returns:
781 * zero for success, a kdb diagnostic if error
782 */
783static int kdb_exec_defcmd(int argc, const char **argv)
784{
785 int i, ret;
786 struct defcmd_set *s;
787 if (argc != 0)
788 return KDB_ARGCOUNT;
789 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
790 if (strcmp(s->name, argv[0]) == 0)
791 break;
792 }
793 if (i == defcmd_set_count) {
794 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
795 argv[0]);
796 return KDB_NOTIMP;
797 }
798 for (i = 0; i < s->count; ++i) {
799 /* Recursive use of kdb_parse, do not use argv after
800 * this point */
801 argv = NULL;
802 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
803 ret = kdb_parse(s->command[i]);
804 if (ret)
805 return ret;
806 }
807 return 0;
808}
809
810/* Command history */
811#define KDB_CMD_HISTORY_COUNT 32
812#define CMD_BUFLEN 200 /* kdb_printf: max printline
813 * size == 256 */
814static unsigned int cmd_head, cmd_tail;
815static unsigned int cmdptr;
816static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
817static char cmd_cur[CMD_BUFLEN];
818
819/*
820 * The "str" argument may point to something like | grep xyz
821 */
822static void parse_grep(const char *str)
823{
824 int len;
825 char *cp = (char *)str, *cp2;
826
827 /* sanity check: we should have been called with the \ first */
828 if (*cp != '|')
829 return;
830 cp++;
831 while (isspace(*cp))
832 cp++;
833 if (strncmp(cp, "grep ", 5)) {
834 kdb_printf("invalid 'pipe', see grephelp\n");
835 return;
836 }
837 cp += 5;
838 while (isspace(*cp))
839 cp++;
840 cp2 = strchr(cp, '\n');
841 if (cp2)
842 *cp2 = '\0'; /* remove the trailing newline */
843 len = strlen(cp);
844 if (len == 0) {
845 kdb_printf("invalid 'pipe', see grephelp\n");
846 return;
847 }
848 /* now cp points to a nonzero length search string */
849 if (*cp == '"') {
850 /* allow it be "x y z" by removing the "'s - there must
851 be two of them */
852 cp++;
853 cp2 = strchr(cp, '"');
854 if (!cp2) {
855 kdb_printf("invalid quoted string, see grephelp\n");
856 return;
857 }
858 *cp2 = '\0'; /* end the string where the 2nd " was */
859 }
860 kdb_grep_leading = 0;
861 if (*cp == '^') {
862 kdb_grep_leading = 1;
863 cp++;
864 }
865 len = strlen(cp);
866 kdb_grep_trailing = 0;
867 if (*(cp+len-1) == '$') {
868 kdb_grep_trailing = 1;
869 *(cp+len-1) = '\0';
870 }
871 len = strlen(cp);
872 if (!len)
873 return;
874 if (len >= KDB_GREP_STRLEN) {
875 kdb_printf("search string too long\n");
876 return;
877 }
878 strcpy(kdb_grep_string, cp);
879 kdb_grepping_flag++;
880 return;
881}
882
883/*
884 * kdb_parse - Parse the command line, search the command table for a
885 * matching command and invoke the command function. This
886 * function may be called recursively, if it is, the second call
887 * will overwrite argv and cbuf. It is the caller's
888 * responsibility to save their argv if they recursively call
889 * kdb_parse().
890 * Parameters:
891 * cmdstr The input command line to be parsed.
892 * regs The registers at the time kdb was entered.
893 * Returns:
894 * Zero for success, a kdb diagnostic if failure.
895 * Remarks:
896 * Limited to 20 tokens.
897 *
898 * Real rudimentary tokenization. Basically only whitespace
899 * is considered a token delimeter (but special consideration
900 * is taken of the '=' sign as used by the 'set' command).
901 *
902 * The algorithm used to tokenize the input string relies on
903 * there being at least one whitespace (or otherwise useless)
904 * character between tokens as the character immediately following
905 * the token is altered in-place to a null-byte to terminate the
906 * token string.
907 */
908
909#define MAXARGC 20
910
911int kdb_parse(const char *cmdstr)
912{
913 static char *argv[MAXARGC];
914 static int argc;
915 static char cbuf[CMD_BUFLEN+2];
916 char *cp;
917 char *cpp, quoted;
918 kdbtab_t *tp;
919 int i, escaped, ignore_errors = 0, check_grep = 0;
920
921 /*
922 * First tokenize the command string.
923 */
924 cp = (char *)cmdstr;
925
926 if (KDB_FLAG(CMD_INTERRUPT)) {
927 /* Previous command was interrupted, newline must not
928 * repeat the command */
929 KDB_FLAG_CLEAR(CMD_INTERRUPT);
930 KDB_STATE_SET(PAGER);
931 argc = 0; /* no repeat */
932 }
933
934 if (*cp != '\n' && *cp != '\0') {
935 argc = 0;
936 cpp = cbuf;
937 while (*cp) {
938 /* skip whitespace */
939 while (isspace(*cp))
940 cp++;
941 if ((*cp == '\0') || (*cp == '\n') ||
942 (*cp == '#' && !defcmd_in_progress))
943 break;
944 /* special case: check for | grep pattern */
945 if (*cp == '|') {
946 check_grep++;
947 break;
948 }
949 if (cpp >= cbuf + CMD_BUFLEN) {
950 kdb_printf("kdb_parse: command buffer "
951 "overflow, command ignored\n%s\n",
952 cmdstr);
953 return KDB_NOTFOUND;
954 }
955 if (argc >= MAXARGC - 1) {
956 kdb_printf("kdb_parse: too many arguments, "
957 "command ignored\n%s\n", cmdstr);
958 return KDB_NOTFOUND;
959 }
960 argv[argc++] = cpp;
961 escaped = 0;
962 quoted = '\0';
963 /* Copy to next unquoted and unescaped
964 * whitespace or '=' */
965 while (*cp && *cp != '\n' &&
966 (escaped || quoted || !isspace(*cp))) {
967 if (cpp >= cbuf + CMD_BUFLEN)
968 break;
969 if (escaped) {
970 escaped = 0;
971 *cpp++ = *cp++;
972 continue;
973 }
974 if (*cp == '\\') {
975 escaped = 1;
976 ++cp;
977 continue;
978 }
979 if (*cp == quoted)
980 quoted = '\0';
981 else if (*cp == '\'' || *cp == '"')
982 quoted = *cp;
983 *cpp = *cp++;
984 if (*cpp == '=' && !quoted)
985 break;
986 ++cpp;
987 }
988 *cpp++ = '\0'; /* Squash a ws or '=' character */
989 }
990 }
991 if (!argc)
992 return 0;
993 if (check_grep)
994 parse_grep(cp);
995 if (defcmd_in_progress) {
996 int result = kdb_defcmd2(cmdstr, argv[0]);
997 if (!defcmd_in_progress) {
998 argc = 0; /* avoid repeat on endefcmd */
999 *(argv[0]) = '\0';
1000 }
1001 return result;
1002 }
1003 if (argv[0][0] == '-' && argv[0][1] &&
1004 (argv[0][1] < '0' || argv[0][1] > '9')) {
1005 ignore_errors = 1;
1006 ++argv[0];
1007 }
1008
1009 for_each_kdbcmd(tp, i) {
1010 if (tp->cmd_name) {
1011 /*
1012 * If this command is allowed to be abbreviated,
1013 * check to see if this is it.
1014 */
1015
1016 if (tp->cmd_minlen
1017 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1018 if (strncmp(argv[0],
1019 tp->cmd_name,
1020 tp->cmd_minlen) == 0) {
1021 break;
1022 }
1023 }
1024
1025 if (strcmp(argv[0], tp->cmd_name) == 0)
1026 break;
1027 }
1028 }
1029
1030 /*
1031 * If we don't find a command by this name, see if the first
1032 * few characters of this match any of the known commands.
1033 * e.g., md1c20 should match md.
1034 */
1035 if (i == kdb_max_commands) {
1036 for_each_kdbcmd(tp, i) {
1037 if (tp->cmd_name) {
1038 if (strncmp(argv[0],
1039 tp->cmd_name,
1040 strlen(tp->cmd_name)) == 0) {
1041 break;
1042 }
1043 }
1044 }
1045 }
1046
1047 if (i < kdb_max_commands) {
1048 int result;
1049
1050 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1051 return KDB_NOPERM;
1052
1053 KDB_STATE_SET(CMD);
1054 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1055 if (result && ignore_errors && result > KDB_CMD_GO)
1056 result = 0;
1057 KDB_STATE_CLEAR(CMD);
1058
1059 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1060 return result;
1061
1062 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1063 if (argv[argc])
1064 *(argv[argc]) = '\0';
1065 return result;
1066 }
1067
1068 /*
1069 * If the input with which we were presented does not
1070 * map to an existing command, attempt to parse it as an
1071 * address argument and display the result. Useful for
1072 * obtaining the address of a variable, or the nearest symbol
1073 * to an address contained in a register.
1074 */
1075 {
1076 unsigned long value;
1077 char *name = NULL;
1078 long offset;
1079 int nextarg = 0;
1080
1081 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1082 &value, &offset, &name)) {
1083 return KDB_NOTFOUND;
1084 }
1085
1086 kdb_printf("%s = ", argv[0]);
1087 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1088 kdb_printf("\n");
1089 return 0;
1090 }
1091}
1092
1093
1094static int handle_ctrl_cmd(char *cmd)
1095{
1096#define CTRL_P 16
1097#define CTRL_N 14
1098
1099 /* initial situation */
1100 if (cmd_head == cmd_tail)
1101 return 0;
1102 switch (*cmd) {
1103 case CTRL_P:
1104 if (cmdptr != cmd_tail)
1105 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1106 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1107 return 1;
1108 case CTRL_N:
1109 if (cmdptr != cmd_head)
1110 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1111 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1112 return 1;
1113 }
1114 return 0;
1115}
1116
1117/*
1118 * kdb_reboot - This function implements the 'reboot' command. Reboot
1119 * the system immediately, or loop for ever on failure.
1120 */
1121static int kdb_reboot(int argc, const char **argv)
1122{
1123 emergency_restart();
1124 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1125 while (1)
1126 cpu_relax();
1127 /* NOTREACHED */
1128 return 0;
1129}
1130
1131static void kdb_dumpregs(struct pt_regs *regs)
1132{
1133 int old_lvl = console_loglevel;
1134 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1135 kdb_trap_printk++;
1136 show_regs(regs);
1137 kdb_trap_printk--;
1138 kdb_printf("\n");
1139 console_loglevel = old_lvl;
1140}
1141
1142void kdb_set_current_task(struct task_struct *p)
1143{
1144 kdb_current_task = p;
1145
1146 if (kdb_task_has_cpu(p)) {
1147 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1148 return;
1149 }
1150 kdb_current_regs = NULL;
1151}
1152
1153static void drop_newline(char *buf)
1154{
1155 size_t len = strlen(buf);
1156
1157 if (len == 0)
1158 return;
1159 if (*(buf + len - 1) == '\n')
1160 *(buf + len - 1) = '\0';
1161}
1162
1163/*
1164 * kdb_local - The main code for kdb. This routine is invoked on a
1165 * specific processor, it is not global. The main kdb() routine
1166 * ensures that only one processor at a time is in this routine.
1167 * This code is called with the real reason code on the first
1168 * entry to a kdb session, thereafter it is called with reason
1169 * SWITCH, even if the user goes back to the original cpu.
1170 * Inputs:
1171 * reason The reason KDB was invoked
1172 * error The hardware-defined error code
1173 * regs The exception frame at time of fault/breakpoint.
1174 * db_result Result code from the break or debug point.
1175 * Returns:
1176 * 0 KDB was invoked for an event which it wasn't responsible
1177 * 1 KDB handled the event for which it was invoked.
1178 * KDB_CMD_GO User typed 'go'.
1179 * KDB_CMD_CPU User switched to another cpu.
1180 * KDB_CMD_SS Single step.
1181 */
1182static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1183 kdb_dbtrap_t db_result)
1184{
1185 char *cmdbuf;
1186 int diag;
1187 struct task_struct *kdb_current =
1188 kdb_curr_task(raw_smp_processor_id());
1189
1190 KDB_DEBUG_STATE("kdb_local 1", reason);
1191 kdb_go_count = 0;
1192 if (reason == KDB_REASON_DEBUG) {
1193 /* special case below */
1194 } else {
1195 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1196 kdb_current, kdb_current ? kdb_current->pid : 0);
1197#if defined(CONFIG_SMP)
1198 kdb_printf("on processor %d ", raw_smp_processor_id());
1199#endif
1200 }
1201
1202 switch (reason) {
1203 case KDB_REASON_DEBUG:
1204 {
1205 /*
1206 * If re-entering kdb after a single step
1207 * command, don't print the message.
1208 */
1209 switch (db_result) {
1210 case KDB_DB_BPT:
1211 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1212 kdb_current, kdb_current->pid);
1213#if defined(CONFIG_SMP)
1214 kdb_printf("on processor %d ", raw_smp_processor_id());
1215#endif
1216 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1217 instruction_pointer(regs));
1218 break;
1219 case KDB_DB_SS:
1220 break;
1221 case KDB_DB_SSBPT:
1222 KDB_DEBUG_STATE("kdb_local 4", reason);
1223 return 1; /* kdba_db_trap did the work */
1224 default:
1225 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1226 db_result);
1227 break;
1228 }
1229
1230 }
1231 break;
1232 case KDB_REASON_ENTER:
1233 if (KDB_STATE(KEYBOARD))
1234 kdb_printf("due to Keyboard Entry\n");
1235 else
1236 kdb_printf("due to KDB_ENTER()\n");
1237 break;
1238 case KDB_REASON_KEYBOARD:
1239 KDB_STATE_SET(KEYBOARD);
1240 kdb_printf("due to Keyboard Entry\n");
1241 break;
1242 case KDB_REASON_ENTER_SLAVE:
1243 /* drop through, slaves only get released via cpu switch */
1244 case KDB_REASON_SWITCH:
1245 kdb_printf("due to cpu switch\n");
1246 break;
1247 case KDB_REASON_OOPS:
1248 kdb_printf("Oops: %s\n", kdb_diemsg);
1249 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1250 instruction_pointer(regs));
1251 kdb_dumpregs(regs);
1252 break;
1253 case KDB_REASON_SYSTEM_NMI:
1254 kdb_printf("due to System NonMaskable Interrupt\n");
1255 break;
1256 case KDB_REASON_NMI:
1257 kdb_printf("due to NonMaskable Interrupt @ "
1258 kdb_machreg_fmt "\n",
1259 instruction_pointer(regs));
1260 break;
1261 case KDB_REASON_SSTEP:
1262 case KDB_REASON_BREAK:
1263 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1264 reason == KDB_REASON_BREAK ?
1265 "Breakpoint" : "SS trap", instruction_pointer(regs));
1266 /*
1267 * Determine if this breakpoint is one that we
1268 * are interested in.
1269 */
1270 if (db_result != KDB_DB_BPT) {
1271 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1272 db_result);
1273 KDB_DEBUG_STATE("kdb_local 6", reason);
1274 return 0; /* Not for us, dismiss it */
1275 }
1276 break;
1277 case KDB_REASON_RECURSE:
1278 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1279 instruction_pointer(regs));
1280 break;
1281 default:
1282 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1283 KDB_DEBUG_STATE("kdb_local 8", reason);
1284 return 0; /* Not for us, dismiss it */
1285 }
1286
1287 while (1) {
1288 /*
1289 * Initialize pager context.
1290 */
1291 kdb_nextline = 1;
1292 KDB_STATE_CLEAR(SUPPRESS);
1293 kdb_grepping_flag = 0;
1294 /* ensure the old search does not leak into '/' commands */
1295 kdb_grep_string[0] = '\0';
1296
1297 cmdbuf = cmd_cur;
1298 *cmdbuf = '\0';
1299 *(cmd_hist[cmd_head]) = '\0';
1300
1301do_full_getstr:
1302#if defined(CONFIG_SMP)
1303 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1304 raw_smp_processor_id());
1305#else
1306 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1307#endif
1308 if (defcmd_in_progress)
1309 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1310
1311 /*
1312 * Fetch command from keyboard
1313 */
1314 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1315 if (*cmdbuf != '\n') {
1316 if (*cmdbuf < 32) {
1317 if (cmdptr == cmd_head) {
1318 strncpy(cmd_hist[cmd_head], cmd_cur,
1319 CMD_BUFLEN);
1320 *(cmd_hist[cmd_head] +
1321 strlen(cmd_hist[cmd_head])-1) = '\0';
1322 }
1323 if (!handle_ctrl_cmd(cmdbuf))
1324 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1325 cmdbuf = cmd_cur;
1326 goto do_full_getstr;
1327 } else {
1328 strncpy(cmd_hist[cmd_head], cmd_cur,
1329 CMD_BUFLEN);
1330 }
1331
1332 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1333 if (cmd_head == cmd_tail)
1334 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1335 }
1336
1337 cmdptr = cmd_head;
1338 diag = kdb_parse(cmdbuf);
1339 if (diag == KDB_NOTFOUND) {
1340 drop_newline(cmdbuf);
1341 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1342 diag = 0;
1343 }
1344 if (diag == KDB_CMD_GO
1345 || diag == KDB_CMD_CPU
1346 || diag == KDB_CMD_SS
1347 || diag == KDB_CMD_KGDB)
1348 break;
1349
1350 if (diag)
1351 kdb_cmderror(diag);
1352 }
1353 KDB_DEBUG_STATE("kdb_local 9", diag);
1354 return diag;
1355}
1356
1357
1358/*
1359 * kdb_print_state - Print the state data for the current processor
1360 * for debugging.
1361 * Inputs:
1362 * text Identifies the debug point
1363 * value Any integer value to be printed, e.g. reason code.
1364 */
1365void kdb_print_state(const char *text, int value)
1366{
1367 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1368 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1369 kdb_state);
1370}
1371
1372/*
1373 * kdb_main_loop - After initial setup and assignment of the
1374 * controlling cpu, all cpus are in this loop. One cpu is in
1375 * control and will issue the kdb prompt, the others will spin
1376 * until 'go' or cpu switch.
1377 *
1378 * To get a consistent view of the kernel stacks for all
1379 * processes, this routine is invoked from the main kdb code via
1380 * an architecture specific routine. kdba_main_loop is
1381 * responsible for making the kernel stacks consistent for all
1382 * processes, there should be no difference between a blocked
1383 * process and a running process as far as kdb is concerned.
1384 * Inputs:
1385 * reason The reason KDB was invoked
1386 * error The hardware-defined error code
1387 * reason2 kdb's current reason code.
1388 * Initially error but can change
1389 * according to kdb state.
1390 * db_result Result code from break or debug point.
1391 * regs The exception frame at time of fault/breakpoint.
1392 * should always be valid.
1393 * Returns:
1394 * 0 KDB was invoked for an event which it wasn't responsible
1395 * 1 KDB handled the event for which it was invoked.
1396 */
1397int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1398 kdb_dbtrap_t db_result, struct pt_regs *regs)
1399{
1400 int result = 1;
1401 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1402 while (1) {
1403 /*
1404 * All processors except the one that is in control
1405 * will spin here.
1406 */
1407 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1408 while (KDB_STATE(HOLD_CPU)) {
1409 /* state KDB is turned off by kdb_cpu to see if the
1410 * other cpus are still live, each cpu in this loop
1411 * turns it back on.
1412 */
1413 if (!KDB_STATE(KDB))
1414 KDB_STATE_SET(KDB);
1415 }
1416
1417 KDB_STATE_CLEAR(SUPPRESS);
1418 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1419 if (KDB_STATE(LEAVING))
1420 break; /* Another cpu said 'go' */
1421 /* Still using kdb, this processor is in control */
1422 result = kdb_local(reason2, error, regs, db_result);
1423 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1424
1425 if (result == KDB_CMD_CPU)
1426 break;
1427
1428 if (result == KDB_CMD_SS) {
1429 KDB_STATE_SET(DOING_SS);
1430 break;
1431 }
1432
1433 if (result == KDB_CMD_KGDB) {
1434 if (!KDB_STATE(DOING_KGDB))
1435 kdb_printf("Entering please attach debugger "
1436 "or use $D#44+ or $3#33\n");
1437 break;
1438 }
1439 if (result && result != 1 && result != KDB_CMD_GO)
1440 kdb_printf("\nUnexpected kdb_local return code %d\n",
1441 result);
1442 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1443 break;
1444 }
1445 if (KDB_STATE(DOING_SS))
1446 KDB_STATE_CLEAR(SSBPT);
1447
1448 /* Clean up any keyboard devices before leaving */
1449 kdb_kbd_cleanup_state();
1450
1451 return result;
1452}
1453
1454/*
1455 * kdb_mdr - This function implements the guts of the 'mdr', memory
1456 * read command.
1457 * mdr <addr arg>,<byte count>
1458 * Inputs:
1459 * addr Start address
1460 * count Number of bytes
1461 * Returns:
1462 * Always 0. Any errors are detected and printed by kdb_getarea.
1463 */
1464static int kdb_mdr(unsigned long addr, unsigned int count)
1465{
1466 unsigned char c;
1467 while (count--) {
1468 if (kdb_getarea(c, addr))
1469 return 0;
1470 kdb_printf("%02x", c);
1471 addr++;
1472 }
1473 kdb_printf("\n");
1474 return 0;
1475}
1476
1477/*
1478 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1479 * 'md8' 'mdr' and 'mds' commands.
1480 *
1481 * md|mds [<addr arg> [<line count> [<radix>]]]
1482 * mdWcN [<addr arg> [<line count> [<radix>]]]
1483 * where W = is the width (1, 2, 4 or 8) and N is the count.
1484 * for eg., md1c20 reads 20 bytes, 1 at a time.
1485 * mdr <addr arg>,<byte count>
1486 */
1487static void kdb_md_line(const char *fmtstr, unsigned long addr,
1488 int symbolic, int nosect, int bytesperword,
1489 int num, int repeat, int phys)
1490{
1491 /* print just one line of data */
1492 kdb_symtab_t symtab;
1493 char cbuf[32];
1494 char *c = cbuf;
1495 int i;
1496 unsigned long word;
1497
1498 memset(cbuf, '\0', sizeof(cbuf));
1499 if (phys)
1500 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1501 else
1502 kdb_printf(kdb_machreg_fmt0 " ", addr);
1503
1504 for (i = 0; i < num && repeat--; i++) {
1505 if (phys) {
1506 if (kdb_getphysword(&word, addr, bytesperword))
1507 break;
1508 } else if (kdb_getword(&word, addr, bytesperword))
1509 break;
1510 kdb_printf(fmtstr, word);
1511 if (symbolic)
1512 kdbnearsym(word, &symtab);
1513 else
1514 memset(&symtab, 0, sizeof(symtab));
1515 if (symtab.sym_name) {
1516 kdb_symbol_print(word, &symtab, 0);
1517 if (!nosect) {
1518 kdb_printf("\n");
1519 kdb_printf(" %s %s "
1520 kdb_machreg_fmt " "
1521 kdb_machreg_fmt " "
1522 kdb_machreg_fmt, symtab.mod_name,
1523 symtab.sec_name, symtab.sec_start,
1524 symtab.sym_start, symtab.sym_end);
1525 }
1526 addr += bytesperword;
1527 } else {
1528 union {
1529 u64 word;
1530 unsigned char c[8];
1531 } wc;
1532 unsigned char *cp;
1533#ifdef __BIG_ENDIAN
1534 cp = wc.c + 8 - bytesperword;
1535#else
1536 cp = wc.c;
1537#endif
1538 wc.word = word;
1539#define printable_char(c) \
1540 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1541 switch (bytesperword) {
1542 case 8:
1543 *c++ = printable_char(*cp++);
1544 *c++ = printable_char(*cp++);
1545 *c++ = printable_char(*cp++);
1546 *c++ = printable_char(*cp++);
1547 addr += 4;
1548 case 4:
1549 *c++ = printable_char(*cp++);
1550 *c++ = printable_char(*cp++);
1551 addr += 2;
1552 case 2:
1553 *c++ = printable_char(*cp++);
1554 addr++;
1555 case 1:
1556 *c++ = printable_char(*cp++);
1557 addr++;
1558 break;
1559 }
1560#undef printable_char
1561 }
1562 }
1563 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1564 " ", cbuf);
1565}
1566
1567static int kdb_md(int argc, const char **argv)
1568{
1569 static unsigned long last_addr;
1570 static int last_radix, last_bytesperword, last_repeat;
1571 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1572 int nosect = 0;
1573 char fmtchar, fmtstr[64];
1574 unsigned long addr;
1575 unsigned long word;
1576 long offset = 0;
1577 int symbolic = 0;
1578 int valid = 0;
1579 int phys = 0;
1580 int raw = 0;
1581
1582 kdbgetintenv("MDCOUNT", &mdcount);
1583 kdbgetintenv("RADIX", &radix);
1584 kdbgetintenv("BYTESPERWORD", &bytesperword);
1585
1586 /* Assume 'md <addr>' and start with environment values */
1587 repeat = mdcount * 16 / bytesperword;
1588
1589 if (strcmp(argv[0], "mdr") == 0) {
1590 if (argc == 2 || (argc == 0 && last_addr != 0))
1591 valid = raw = 1;
1592 else
1593 return KDB_ARGCOUNT;
1594 } else if (isdigit(argv[0][2])) {
1595 bytesperword = (int)(argv[0][2] - '0');
1596 if (bytesperword == 0) {
1597 bytesperword = last_bytesperword;
1598 if (bytesperword == 0)
1599 bytesperword = 4;
1600 }
1601 last_bytesperword = bytesperword;
1602 repeat = mdcount * 16 / bytesperword;
1603 if (!argv[0][3])
1604 valid = 1;
1605 else if (argv[0][3] == 'c' && argv[0][4]) {
1606 char *p;
1607 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1608 mdcount = ((repeat * bytesperword) + 15) / 16;
1609 valid = !*p;
1610 }
1611 last_repeat = repeat;
1612 } else if (strcmp(argv[0], "md") == 0)
1613 valid = 1;
1614 else if (strcmp(argv[0], "mds") == 0)
1615 valid = 1;
1616 else if (strcmp(argv[0], "mdp") == 0) {
1617 phys = valid = 1;
1618 }
1619 if (!valid)
1620 return KDB_NOTFOUND;
1621
1622 if (argc == 0) {
1623 if (last_addr == 0)
1624 return KDB_ARGCOUNT;
1625 addr = last_addr;
1626 radix = last_radix;
1627 bytesperword = last_bytesperword;
1628 repeat = last_repeat;
1629 if (raw)
1630 mdcount = repeat;
1631 else
1632 mdcount = ((repeat * bytesperword) + 15) / 16;
1633 }
1634
1635 if (argc) {
1636 unsigned long val;
1637 int diag, nextarg = 1;
1638 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1639 &offset, NULL);
1640 if (diag)
1641 return diag;
1642 if (argc > nextarg+2)
1643 return KDB_ARGCOUNT;
1644
1645 if (argc >= nextarg) {
1646 diag = kdbgetularg(argv[nextarg], &val);
1647 if (!diag) {
1648 mdcount = (int) val;
1649 if (raw)
1650 repeat = mdcount;
1651 else
1652 repeat = mdcount * 16 / bytesperword;
1653 }
1654 }
1655 if (argc >= nextarg+1) {
1656 diag = kdbgetularg(argv[nextarg+1], &val);
1657 if (!diag)
1658 radix = (int) val;
1659 }
1660 }
1661
1662 if (strcmp(argv[0], "mdr") == 0) {
1663 int ret;
1664 last_addr = addr;
1665 ret = kdb_mdr(addr, mdcount);
1666 last_addr += mdcount;
1667 last_repeat = mdcount;
1668 last_bytesperword = bytesperword; // to make REPEAT happy
1669 return ret;
1670 }
1671
1672 switch (radix) {
1673 case 10:
1674 fmtchar = 'd';
1675 break;
1676 case 16:
1677 fmtchar = 'x';
1678 break;
1679 case 8:
1680 fmtchar = 'o';
1681 break;
1682 default:
1683 return KDB_BADRADIX;
1684 }
1685
1686 last_radix = radix;
1687
1688 if (bytesperword > KDB_WORD_SIZE)
1689 return KDB_BADWIDTH;
1690
1691 switch (bytesperword) {
1692 case 8:
1693 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1694 break;
1695 case 4:
1696 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1697 break;
1698 case 2:
1699 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1700 break;
1701 case 1:
1702 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1703 break;
1704 default:
1705 return KDB_BADWIDTH;
1706 }
1707
1708 last_repeat = repeat;
1709 last_bytesperword = bytesperword;
1710
1711 if (strcmp(argv[0], "mds") == 0) {
1712 symbolic = 1;
1713 /* Do not save these changes as last_*, they are temporary mds
1714 * overrides.
1715 */
1716 bytesperword = KDB_WORD_SIZE;
1717 repeat = mdcount;
1718 kdbgetintenv("NOSECT", &nosect);
1719 }
1720
1721 /* Round address down modulo BYTESPERWORD */
1722
1723 addr &= ~(bytesperword-1);
1724
1725 while (repeat > 0) {
1726 unsigned long a;
1727 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1728
1729 if (KDB_FLAG(CMD_INTERRUPT))
1730 return 0;
1731 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1732 if (phys) {
1733 if (kdb_getphysword(&word, a, bytesperword)
1734 || word)
1735 break;
1736 } else if (kdb_getword(&word, a, bytesperword) || word)
1737 break;
1738 }
1739 n = min(num, repeat);
1740 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1741 num, repeat, phys);
1742 addr += bytesperword * n;
1743 repeat -= n;
1744 z = (z + num - 1) / num;
1745 if (z > 2) {
1746 int s = num * (z-2);
1747 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1748 " zero suppressed\n",
1749 addr, addr + bytesperword * s - 1);
1750 addr += bytesperword * s;
1751 repeat -= s;
1752 }
1753 }
1754 last_addr = addr;
1755
1756 return 0;
1757}
1758
1759/*
1760 * kdb_mm - This function implements the 'mm' command.
1761 * mm address-expression new-value
1762 * Remarks:
1763 * mm works on machine words, mmW works on bytes.
1764 */
1765static int kdb_mm(int argc, const char **argv)
1766{
1767 int diag;
1768 unsigned long addr;
1769 long offset = 0;
1770 unsigned long contents;
1771 int nextarg;
1772 int width;
1773
1774 if (argv[0][2] && !isdigit(argv[0][2]))
1775 return KDB_NOTFOUND;
1776
1777 if (argc < 2)
1778 return KDB_ARGCOUNT;
1779
1780 nextarg = 1;
1781 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1782 if (diag)
1783 return diag;
1784
1785 if (nextarg > argc)
1786 return KDB_ARGCOUNT;
1787 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1788 if (diag)
1789 return diag;
1790
1791 if (nextarg != argc + 1)
1792 return KDB_ARGCOUNT;
1793
1794 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1795 diag = kdb_putword(addr, contents, width);
1796 if (diag)
1797 return diag;
1798
1799 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1800
1801 return 0;
1802}
1803
1804/*
1805 * kdb_go - This function implements the 'go' command.
1806 * go [address-expression]
1807 */
1808static int kdb_go(int argc, const char **argv)
1809{
1810 unsigned long addr;
1811 int diag;
1812 int nextarg;
1813 long offset;
1814
1815 if (raw_smp_processor_id() != kdb_initial_cpu) {
1816 kdb_printf("go must execute on the entry cpu, "
1817 "please use \"cpu %d\" and then execute go\n",
1818 kdb_initial_cpu);
1819 return KDB_BADCPUNUM;
1820 }
1821 if (argc == 1) {
1822 nextarg = 1;
1823 diag = kdbgetaddrarg(argc, argv, &nextarg,
1824 &addr, &offset, NULL);
1825 if (diag)
1826 return diag;
1827 } else if (argc) {
1828 return KDB_ARGCOUNT;
1829 }
1830
1831 diag = KDB_CMD_GO;
1832 if (KDB_FLAG(CATASTROPHIC)) {
1833 kdb_printf("Catastrophic error detected\n");
1834 kdb_printf("kdb_continue_catastrophic=%d, ",
1835 kdb_continue_catastrophic);
1836 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1837 kdb_printf("type go a second time if you really want "
1838 "to continue\n");
1839 return 0;
1840 }
1841 if (kdb_continue_catastrophic == 2) {
1842 kdb_printf("forcing reboot\n");
1843 kdb_reboot(0, NULL);
1844 }
1845 kdb_printf("attempting to continue\n");
1846 }
1847 return diag;
1848}
1849
1850/*
1851 * kdb_rd - This function implements the 'rd' command.
1852 */
1853static int kdb_rd(int argc, const char **argv)
1854{
1855 int len = kdb_check_regs();
1856#if DBG_MAX_REG_NUM > 0
1857 int i;
1858 char *rname;
1859 int rsize;
1860 u64 reg64;
1861 u32 reg32;
1862 u16 reg16;
1863 u8 reg8;
1864
1865 if (len)
1866 return len;
1867
1868 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1869 rsize = dbg_reg_def[i].size * 2;
1870 if (rsize > 16)
1871 rsize = 2;
1872 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1873 len = 0;
1874 kdb_printf("\n");
1875 }
1876 if (len)
1877 len += kdb_printf(" ");
1878 switch(dbg_reg_def[i].size * 8) {
1879 case 8:
1880 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1881 if (!rname)
1882 break;
1883 len += kdb_printf("%s: %02x", rname, reg8);
1884 break;
1885 case 16:
1886 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1887 if (!rname)
1888 break;
1889 len += kdb_printf("%s: %04x", rname, reg16);
1890 break;
1891 case 32:
1892 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1893 if (!rname)
1894 break;
1895 len += kdb_printf("%s: %08x", rname, reg32);
1896 break;
1897 case 64:
1898 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1899 if (!rname)
1900 break;
1901 len += kdb_printf("%s: %016llx", rname, reg64);
1902 break;
1903 default:
1904 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1905 }
1906 }
1907 kdb_printf("\n");
1908#else
1909 if (len)
1910 return len;
1911
1912 kdb_dumpregs(kdb_current_regs);
1913#endif
1914 return 0;
1915}
1916
1917/*
1918 * kdb_rm - This function implements the 'rm' (register modify) command.
1919 * rm register-name new-contents
1920 * Remarks:
1921 * Allows register modification with the same restrictions as gdb
1922 */
1923static int kdb_rm(int argc, const char **argv)
1924{
1925#if DBG_MAX_REG_NUM > 0
1926 int diag;
1927 const char *rname;
1928 int i;
1929 u64 reg64;
1930 u32 reg32;
1931 u16 reg16;
1932 u8 reg8;
1933
1934 if (argc != 2)
1935 return KDB_ARGCOUNT;
1936 /*
1937 * Allow presence or absence of leading '%' symbol.
1938 */
1939 rname = argv[1];
1940 if (*rname == '%')
1941 rname++;
1942
1943 diag = kdbgetu64arg(argv[2], ®64);
1944 if (diag)
1945 return diag;
1946
1947 diag = kdb_check_regs();
1948 if (diag)
1949 return diag;
1950
1951 diag = KDB_BADREG;
1952 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1953 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1954 diag = 0;
1955 break;
1956 }
1957 }
1958 if (!diag) {
1959 switch(dbg_reg_def[i].size * 8) {
1960 case 8:
1961 reg8 = reg64;
1962 dbg_set_reg(i, ®8, kdb_current_regs);
1963 break;
1964 case 16:
1965 reg16 = reg64;
1966 dbg_set_reg(i, ®16, kdb_current_regs);
1967 break;
1968 case 32:
1969 reg32 = reg64;
1970 dbg_set_reg(i, ®32, kdb_current_regs);
1971 break;
1972 case 64:
1973 dbg_set_reg(i, ®64, kdb_current_regs);
1974 break;
1975 }
1976 }
1977 return diag;
1978#else
1979 kdb_printf("ERROR: Register set currently not implemented\n");
1980 return 0;
1981#endif
1982}
1983
1984#if defined(CONFIG_MAGIC_SYSRQ)
1985/*
1986 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1987 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1988 * sr <magic-sysrq-code>
1989 */
1990static int kdb_sr(int argc, const char **argv)
1991{
1992 bool check_mask =
1993 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1994
1995 if (argc != 1)
1996 return KDB_ARGCOUNT;
1997
1998 kdb_trap_printk++;
1999 __handle_sysrq(*argv[1], check_mask);
2000 kdb_trap_printk--;
2001
2002 return 0;
2003}
2004#endif /* CONFIG_MAGIC_SYSRQ */
2005
2006/*
2007 * kdb_ef - This function implements the 'regs' (display exception
2008 * frame) command. This command takes an address and expects to
2009 * find an exception frame at that address, formats and prints
2010 * it.
2011 * regs address-expression
2012 * Remarks:
2013 * Not done yet.
2014 */
2015static int kdb_ef(int argc, const char **argv)
2016{
2017 int diag;
2018 unsigned long addr;
2019 long offset;
2020 int nextarg;
2021
2022 if (argc != 1)
2023 return KDB_ARGCOUNT;
2024
2025 nextarg = 1;
2026 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2027 if (diag)
2028 return diag;
2029 show_regs((struct pt_regs *)addr);
2030 return 0;
2031}
2032
2033#if defined(CONFIG_MODULES)
2034/*
2035 * kdb_lsmod - This function implements the 'lsmod' command. Lists
2036 * currently loaded kernel modules.
2037 * Mostly taken from userland lsmod.
2038 */
2039static int kdb_lsmod(int argc, const char **argv)
2040{
2041 struct module *mod;
2042
2043 if (argc != 0)
2044 return KDB_ARGCOUNT;
2045
2046 kdb_printf("Module Size modstruct Used by\n");
2047 list_for_each_entry(mod, kdb_modules, list) {
2048 if (mod->state == MODULE_STATE_UNFORMED)
2049 continue;
2050
2051 kdb_printf("%-20s%8u 0x%p ", mod->name,
2052 mod->core_layout.size, (void *)mod);
2053#ifdef CONFIG_MODULE_UNLOAD
2054 kdb_printf("%4d ", module_refcount(mod));
2055#endif
2056 if (mod->state == MODULE_STATE_GOING)
2057 kdb_printf(" (Unloading)");
2058 else if (mod->state == MODULE_STATE_COMING)
2059 kdb_printf(" (Loading)");
2060 else
2061 kdb_printf(" (Live)");
2062 kdb_printf(" 0x%p", mod->core_layout.base);
2063
2064#ifdef CONFIG_MODULE_UNLOAD
2065 {
2066 struct module_use *use;
2067 kdb_printf(" [ ");
2068 list_for_each_entry(use, &mod->source_list,
2069 source_list)
2070 kdb_printf("%s ", use->target->name);
2071 kdb_printf("]\n");
2072 }
2073#endif
2074 }
2075
2076 return 0;
2077}
2078
2079#endif /* CONFIG_MODULES */
2080
2081/*
2082 * kdb_env - This function implements the 'env' command. Display the
2083 * current environment variables.
2084 */
2085
2086static int kdb_env(int argc, const char **argv)
2087{
2088 int i;
2089
2090 for (i = 0; i < __nenv; i++) {
2091 if (__env[i])
2092 kdb_printf("%s\n", __env[i]);
2093 }
2094
2095 if (KDB_DEBUG(MASK))
2096 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2097
2098 return 0;
2099}
2100
2101#ifdef CONFIG_PRINTK
2102/*
2103 * kdb_dmesg - This function implements the 'dmesg' command to display
2104 * the contents of the syslog buffer.
2105 * dmesg [lines] [adjust]
2106 */
2107static int kdb_dmesg(int argc, const char **argv)
2108{
2109 int diag;
2110 int logging;
2111 int lines = 0;
2112 int adjust = 0;
2113 int n = 0;
2114 int skip = 0;
2115 struct kmsg_dumper dumper = { .active = 1 };
2116 size_t len;
2117 char buf[201];
2118
2119 if (argc > 2)
2120 return KDB_ARGCOUNT;
2121 if (argc) {
2122 char *cp;
2123 lines = simple_strtol(argv[1], &cp, 0);
2124 if (*cp)
2125 lines = 0;
2126 if (argc > 1) {
2127 adjust = simple_strtoul(argv[2], &cp, 0);
2128 if (*cp || adjust < 0)
2129 adjust = 0;
2130 }
2131 }
2132
2133 /* disable LOGGING if set */
2134 diag = kdbgetintenv("LOGGING", &logging);
2135 if (!diag && logging) {
2136 const char *setargs[] = { "set", "LOGGING", "0" };
2137 kdb_set(2, setargs);
2138 }
2139
2140 kmsg_dump_rewind_nolock(&dumper);
2141 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2142 n++;
2143
2144 if (lines < 0) {
2145 if (adjust >= n)
2146 kdb_printf("buffer only contains %d lines, nothing "
2147 "printed\n", n);
2148 else if (adjust - lines >= n)
2149 kdb_printf("buffer only contains %d lines, last %d "
2150 "lines printed\n", n, n - adjust);
2151 skip = adjust;
2152 lines = abs(lines);
2153 } else if (lines > 0) {
2154 skip = n - lines - adjust;
2155 lines = abs(lines);
2156 if (adjust >= n) {
2157 kdb_printf("buffer only contains %d lines, "
2158 "nothing printed\n", n);
2159 skip = n;
2160 } else if (skip < 0) {
2161 lines += skip;
2162 skip = 0;
2163 kdb_printf("buffer only contains %d lines, first "
2164 "%d lines printed\n", n, lines);
2165 }
2166 } else {
2167 lines = n;
2168 }
2169
2170 if (skip >= n || skip < 0)
2171 return 0;
2172
2173 kmsg_dump_rewind_nolock(&dumper);
2174 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2175 if (skip) {
2176 skip--;
2177 continue;
2178 }
2179 if (!lines--)
2180 break;
2181 if (KDB_FLAG(CMD_INTERRUPT))
2182 return 0;
2183
2184 kdb_printf("%.*s\n", (int)len - 1, buf);
2185 }
2186
2187 return 0;
2188}
2189#endif /* CONFIG_PRINTK */
2190
2191/* Make sure we balance enable/disable calls, must disable first. */
2192static atomic_t kdb_nmi_disabled;
2193
2194static int kdb_disable_nmi(int argc, const char *argv[])
2195{
2196 if (atomic_read(&kdb_nmi_disabled))
2197 return 0;
2198 atomic_set(&kdb_nmi_disabled, 1);
2199 arch_kgdb_ops.enable_nmi(0);
2200 return 0;
2201}
2202
2203static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2204{
2205 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2206 return -EINVAL;
2207 arch_kgdb_ops.enable_nmi(1);
2208 return 0;
2209}
2210
2211static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2212 .set = kdb_param_enable_nmi,
2213};
2214module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2215
2216/*
2217 * kdb_cpu - This function implements the 'cpu' command.
2218 * cpu [<cpunum>]
2219 * Returns:
2220 * KDB_CMD_CPU for success, a kdb diagnostic if error
2221 */
2222static void kdb_cpu_status(void)
2223{
2224 int i, start_cpu, first_print = 1;
2225 char state, prev_state = '?';
2226
2227 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2228 kdb_printf("Available cpus: ");
2229 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2230 if (!cpu_online(i)) {
2231 state = 'F'; /* cpu is offline */
2232 } else if (!kgdb_info[i].enter_kgdb) {
2233 state = 'D'; /* cpu is online but unresponsive */
2234 } else {
2235 state = ' '; /* cpu is responding to kdb */
2236 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2237 state = 'I'; /* idle task */
2238 }
2239 if (state != prev_state) {
2240 if (prev_state != '?') {
2241 if (!first_print)
2242 kdb_printf(", ");
2243 first_print = 0;
2244 kdb_printf("%d", start_cpu);
2245 if (start_cpu < i-1)
2246 kdb_printf("-%d", i-1);
2247 if (prev_state != ' ')
2248 kdb_printf("(%c)", prev_state);
2249 }
2250 prev_state = state;
2251 start_cpu = i;
2252 }
2253 }
2254 /* print the trailing cpus, ignoring them if they are all offline */
2255 if (prev_state != 'F') {
2256 if (!first_print)
2257 kdb_printf(", ");
2258 kdb_printf("%d", start_cpu);
2259 if (start_cpu < i-1)
2260 kdb_printf("-%d", i-1);
2261 if (prev_state != ' ')
2262 kdb_printf("(%c)", prev_state);
2263 }
2264 kdb_printf("\n");
2265}
2266
2267static int kdb_cpu(int argc, const char **argv)
2268{
2269 unsigned long cpunum;
2270 int diag;
2271
2272 if (argc == 0) {
2273 kdb_cpu_status();
2274 return 0;
2275 }
2276
2277 if (argc != 1)
2278 return KDB_ARGCOUNT;
2279
2280 diag = kdbgetularg(argv[1], &cpunum);
2281 if (diag)
2282 return diag;
2283
2284 /*
2285 * Validate cpunum
2286 */
2287 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2288 return KDB_BADCPUNUM;
2289
2290 dbg_switch_cpu = cpunum;
2291
2292 /*
2293 * Switch to other cpu
2294 */
2295 return KDB_CMD_CPU;
2296}
2297
2298/* The user may not realize that ps/bta with no parameters does not print idle
2299 * or sleeping system daemon processes, so tell them how many were suppressed.
2300 */
2301void kdb_ps_suppressed(void)
2302{
2303 int idle = 0, daemon = 0;
2304 unsigned long mask_I = kdb_task_state_string("I"),
2305 mask_M = kdb_task_state_string("M");
2306 unsigned long cpu;
2307 const struct task_struct *p, *g;
2308 for_each_online_cpu(cpu) {
2309 p = kdb_curr_task(cpu);
2310 if (kdb_task_state(p, mask_I))
2311 ++idle;
2312 }
2313 kdb_do_each_thread(g, p) {
2314 if (kdb_task_state(p, mask_M))
2315 ++daemon;
2316 } kdb_while_each_thread(g, p);
2317 if (idle || daemon) {
2318 if (idle)
2319 kdb_printf("%d idle process%s (state I)%s\n",
2320 idle, idle == 1 ? "" : "es",
2321 daemon ? " and " : "");
2322 if (daemon)
2323 kdb_printf("%d sleeping system daemon (state M) "
2324 "process%s", daemon,
2325 daemon == 1 ? "" : "es");
2326 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2327 }
2328}
2329
2330/*
2331 * kdb_ps - This function implements the 'ps' command which shows a
2332 * list of the active processes.
2333 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2334 */
2335void kdb_ps1(const struct task_struct *p)
2336{
2337 int cpu;
2338 unsigned long tmp;
2339
2340 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2341 return;
2342
2343 cpu = kdb_process_cpu(p);
2344 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2345 (void *)p, p->pid, p->parent->pid,
2346 kdb_task_has_cpu(p), kdb_process_cpu(p),
2347 kdb_task_state_char(p),
2348 (void *)(&p->thread),
2349 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2350 p->comm);
2351 if (kdb_task_has_cpu(p)) {
2352 if (!KDB_TSK(cpu)) {
2353 kdb_printf(" Error: no saved data for this cpu\n");
2354 } else {
2355 if (KDB_TSK(cpu) != p)
2356 kdb_printf(" Error: does not match running "
2357 "process table (0x%p)\n", KDB_TSK(cpu));
2358 }
2359 }
2360}
2361
2362static int kdb_ps(int argc, const char **argv)
2363{
2364 struct task_struct *g, *p;
2365 unsigned long mask, cpu;
2366
2367 if (argc == 0)
2368 kdb_ps_suppressed();
2369 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2370 (int)(2*sizeof(void *))+2, "Task Addr",
2371 (int)(2*sizeof(void *))+2, "Thread");
2372 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2373 /* Run the active tasks first */
2374 for_each_online_cpu(cpu) {
2375 if (KDB_FLAG(CMD_INTERRUPT))
2376 return 0;
2377 p = kdb_curr_task(cpu);
2378 if (kdb_task_state(p, mask))
2379 kdb_ps1(p);
2380 }
2381 kdb_printf("\n");
2382 /* Now the real tasks */
2383 kdb_do_each_thread(g, p) {
2384 if (KDB_FLAG(CMD_INTERRUPT))
2385 return 0;
2386 if (kdb_task_state(p, mask))
2387 kdb_ps1(p);
2388 } kdb_while_each_thread(g, p);
2389
2390 return 0;
2391}
2392
2393/*
2394 * kdb_pid - This function implements the 'pid' command which switches
2395 * the currently active process.
2396 * pid [<pid> | R]
2397 */
2398static int kdb_pid(int argc, const char **argv)
2399{
2400 struct task_struct *p;
2401 unsigned long val;
2402 int diag;
2403
2404 if (argc > 1)
2405 return KDB_ARGCOUNT;
2406
2407 if (argc) {
2408 if (strcmp(argv[1], "R") == 0) {
2409 p = KDB_TSK(kdb_initial_cpu);
2410 } else {
2411 diag = kdbgetularg(argv[1], &val);
2412 if (diag)
2413 return KDB_BADINT;
2414
2415 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2416 if (!p) {
2417 kdb_printf("No task with pid=%d\n", (pid_t)val);
2418 return 0;
2419 }
2420 }
2421 kdb_set_current_task(p);
2422 }
2423 kdb_printf("KDB current process is %s(pid=%d)\n",
2424 kdb_current_task->comm,
2425 kdb_current_task->pid);
2426
2427 return 0;
2428}
2429
2430static int kdb_kgdb(int argc, const char **argv)
2431{
2432 return KDB_CMD_KGDB;
2433}
2434
2435/*
2436 * kdb_help - This function implements the 'help' and '?' commands.
2437 */
2438static int kdb_help(int argc, const char **argv)
2439{
2440 kdbtab_t *kt;
2441 int i;
2442
2443 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2444 kdb_printf("-----------------------------"
2445 "-----------------------------\n");
2446 for_each_kdbcmd(kt, i) {
2447 char *space = "";
2448 if (KDB_FLAG(CMD_INTERRUPT))
2449 return 0;
2450 if (!kt->cmd_name)
2451 continue;
2452 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2453 continue;
2454 if (strlen(kt->cmd_usage) > 20)
2455 space = "\n ";
2456 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2457 kt->cmd_usage, space, kt->cmd_help);
2458 }
2459 return 0;
2460}
2461
2462/*
2463 * kdb_kill - This function implements the 'kill' commands.
2464 */
2465static int kdb_kill(int argc, const char **argv)
2466{
2467 long sig, pid;
2468 char *endp;
2469 struct task_struct *p;
2470
2471 if (argc != 2)
2472 return KDB_ARGCOUNT;
2473
2474 sig = simple_strtol(argv[1], &endp, 0);
2475 if (*endp)
2476 return KDB_BADINT;
2477 if ((sig >= 0) || !valid_signal(-sig)) {
2478 kdb_printf("Invalid signal parameter.<-signal>\n");
2479 return 0;
2480 }
2481 sig = -sig;
2482
2483 pid = simple_strtol(argv[2], &endp, 0);
2484 if (*endp)
2485 return KDB_BADINT;
2486 if (pid <= 0) {
2487 kdb_printf("Process ID must be large than 0.\n");
2488 return 0;
2489 }
2490
2491 /* Find the process. */
2492 p = find_task_by_pid_ns(pid, &init_pid_ns);
2493 if (!p) {
2494 kdb_printf("The specified process isn't found.\n");
2495 return 0;
2496 }
2497 p = p->group_leader;
2498 kdb_send_sig(p, sig);
2499 return 0;
2500}
2501
2502/*
2503 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2504 * I cannot call that code directly from kdb, it has an unconditional
2505 * cli()/sti() and calls routines that take locks which can stop the debugger.
2506 */
2507static void kdb_sysinfo(struct sysinfo *val)
2508{
2509 u64 uptime = ktime_get_mono_fast_ns();
2510
2511 memset(val, 0, sizeof(*val));
2512 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2513 val->loads[0] = avenrun[0];
2514 val->loads[1] = avenrun[1];
2515 val->loads[2] = avenrun[2];
2516 val->procs = nr_threads-1;
2517 si_meminfo(val);
2518
2519 return;
2520}
2521
2522/*
2523 * kdb_summary - This function implements the 'summary' command.
2524 */
2525static int kdb_summary(int argc, const char **argv)
2526{
2527 time64_t now;
2528 struct tm tm;
2529 struct sysinfo val;
2530
2531 if (argc)
2532 return KDB_ARGCOUNT;
2533
2534 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2535 kdb_printf("release %s\n", init_uts_ns.name.release);
2536 kdb_printf("version %s\n", init_uts_ns.name.version);
2537 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2538 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2539 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2540 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2541
2542 now = __ktime_get_real_seconds();
2543 time64_to_tm(now, 0, &tm);
2544 kdb_printf("date %04ld-%02d-%02d %02d:%02d:%02d "
2545 "tz_minuteswest %d\n",
2546 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2547 tm.tm_hour, tm.tm_min, tm.tm_sec,
2548 sys_tz.tz_minuteswest);
2549
2550 kdb_sysinfo(&val);
2551 kdb_printf("uptime ");
2552 if (val.uptime > (24*60*60)) {
2553 int days = val.uptime / (24*60*60);
2554 val.uptime %= (24*60*60);
2555 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2556 }
2557 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2558
2559 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2560
2561#define LOAD_INT(x) ((x) >> FSHIFT)
2562#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2563 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2564 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2565 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2566 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2567#undef LOAD_INT
2568#undef LOAD_FRAC
2569 /* Display in kilobytes */
2570#define K(x) ((x) << (PAGE_SHIFT - 10))
2571 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2572 "Buffers: %8lu kB\n",
2573 K(val.totalram), K(val.freeram), K(val.bufferram));
2574 return 0;
2575}
2576
2577/*
2578 * kdb_per_cpu - This function implements the 'per_cpu' command.
2579 */
2580static int kdb_per_cpu(int argc, const char **argv)
2581{
2582 char fmtstr[64];
2583 int cpu, diag, nextarg = 1;
2584 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2585
2586 if (argc < 1 || argc > 3)
2587 return KDB_ARGCOUNT;
2588
2589 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2590 if (diag)
2591 return diag;
2592
2593 if (argc >= 2) {
2594 diag = kdbgetularg(argv[2], &bytesperword);
2595 if (diag)
2596 return diag;
2597 }
2598 if (!bytesperword)
2599 bytesperword = KDB_WORD_SIZE;
2600 else if (bytesperword > KDB_WORD_SIZE)
2601 return KDB_BADWIDTH;
2602 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2603 if (argc >= 3) {
2604 diag = kdbgetularg(argv[3], &whichcpu);
2605 if (diag)
2606 return diag;
2607 if (!cpu_online(whichcpu)) {
2608 kdb_printf("cpu %ld is not online\n", whichcpu);
2609 return KDB_BADCPUNUM;
2610 }
2611 }
2612
2613 /* Most architectures use __per_cpu_offset[cpu], some use
2614 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2615 */
2616#ifdef __per_cpu_offset
2617#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2618#else
2619#ifdef CONFIG_SMP
2620#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2621#else
2622#define KDB_PCU(cpu) 0
2623#endif
2624#endif
2625 for_each_online_cpu(cpu) {
2626 if (KDB_FLAG(CMD_INTERRUPT))
2627 return 0;
2628
2629 if (whichcpu != ~0UL && whichcpu != cpu)
2630 continue;
2631 addr = symaddr + KDB_PCU(cpu);
2632 diag = kdb_getword(&val, addr, bytesperword);
2633 if (diag) {
2634 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2635 "read, diag=%d\n", cpu, addr, diag);
2636 continue;
2637 }
2638 kdb_printf("%5d ", cpu);
2639 kdb_md_line(fmtstr, addr,
2640 bytesperword == KDB_WORD_SIZE,
2641 1, bytesperword, 1, 1, 0);
2642 }
2643#undef KDB_PCU
2644 return 0;
2645}
2646
2647/*
2648 * display help for the use of cmd | grep pattern
2649 */
2650static int kdb_grep_help(int argc, const char **argv)
2651{
2652 kdb_printf("Usage of cmd args | grep pattern:\n");
2653 kdb_printf(" Any command's output may be filtered through an ");
2654 kdb_printf("emulated 'pipe'.\n");
2655 kdb_printf(" 'grep' is just a key word.\n");
2656 kdb_printf(" The pattern may include a very limited set of "
2657 "metacharacters:\n");
2658 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2659 kdb_printf(" And if there are spaces in the pattern, you may "
2660 "quote it:\n");
2661 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2662 " or \"^pat tern$\"\n");
2663 return 0;
2664}
2665
2666/*
2667 * kdb_register_flags - This function is used to register a kernel
2668 * debugger command.
2669 * Inputs:
2670 * cmd Command name
2671 * func Function to execute the command
2672 * usage A simple usage string showing arguments
2673 * help A simple help string describing command
2674 * repeat Does the command auto repeat on enter?
2675 * Returns:
2676 * zero for success, one if a duplicate command.
2677 */
2678#define kdb_command_extend 50 /* arbitrary */
2679int kdb_register_flags(char *cmd,
2680 kdb_func_t func,
2681 char *usage,
2682 char *help,
2683 short minlen,
2684 kdb_cmdflags_t flags)
2685{
2686 int i;
2687 kdbtab_t *kp;
2688
2689 /*
2690 * Brute force method to determine duplicates
2691 */
2692 for_each_kdbcmd(kp, i) {
2693 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2694 kdb_printf("Duplicate kdb command registered: "
2695 "%s, func %p help %s\n", cmd, func, help);
2696 return 1;
2697 }
2698 }
2699
2700 /*
2701 * Insert command into first available location in table
2702 */
2703 for_each_kdbcmd(kp, i) {
2704 if (kp->cmd_name == NULL)
2705 break;
2706 }
2707
2708 if (i >= kdb_max_commands) {
2709 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2710 kdb_command_extend) * sizeof(*new), GFP_KDB);
2711 if (!new) {
2712 kdb_printf("Could not allocate new kdb_command "
2713 "table\n");
2714 return 1;
2715 }
2716 if (kdb_commands) {
2717 memcpy(new, kdb_commands,
2718 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2719 kfree(kdb_commands);
2720 }
2721 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2722 kdb_command_extend * sizeof(*new));
2723 kdb_commands = new;
2724 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2725 kdb_max_commands += kdb_command_extend;
2726 }
2727
2728 kp->cmd_name = cmd;
2729 kp->cmd_func = func;
2730 kp->cmd_usage = usage;
2731 kp->cmd_help = help;
2732 kp->cmd_minlen = minlen;
2733 kp->cmd_flags = flags;
2734
2735 return 0;
2736}
2737EXPORT_SYMBOL_GPL(kdb_register_flags);
2738
2739
2740/*
2741 * kdb_register - Compatibility register function for commands that do
2742 * not need to specify a repeat state. Equivalent to
2743 * kdb_register_flags with flags set to 0.
2744 * Inputs:
2745 * cmd Command name
2746 * func Function to execute the command
2747 * usage A simple usage string showing arguments
2748 * help A simple help string describing command
2749 * Returns:
2750 * zero for success, one if a duplicate command.
2751 */
2752int kdb_register(char *cmd,
2753 kdb_func_t func,
2754 char *usage,
2755 char *help,
2756 short minlen)
2757{
2758 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2759}
2760EXPORT_SYMBOL_GPL(kdb_register);
2761
2762/*
2763 * kdb_unregister - This function is used to unregister a kernel
2764 * debugger command. It is generally called when a module which
2765 * implements kdb commands is unloaded.
2766 * Inputs:
2767 * cmd Command name
2768 * Returns:
2769 * zero for success, one command not registered.
2770 */
2771int kdb_unregister(char *cmd)
2772{
2773 int i;
2774 kdbtab_t *kp;
2775
2776 /*
2777 * find the command.
2778 */
2779 for_each_kdbcmd(kp, i) {
2780 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2781 kp->cmd_name = NULL;
2782 return 0;
2783 }
2784 }
2785
2786 /* Couldn't find it. */
2787 return 1;
2788}
2789EXPORT_SYMBOL_GPL(kdb_unregister);
2790
2791/* Initialize the kdb command table. */
2792static void __init kdb_inittab(void)
2793{
2794 int i;
2795 kdbtab_t *kp;
2796
2797 for_each_kdbcmd(kp, i)
2798 kp->cmd_name = NULL;
2799
2800 kdb_register_flags("md", kdb_md, "<vaddr>",
2801 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2802 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2803 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2804 "Display Raw Memory", 0,
2805 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2806 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2807 "Display Physical Memory", 0,
2808 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2809 kdb_register_flags("mds", kdb_md, "<vaddr>",
2810 "Display Memory Symbolically", 0,
2811 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2812 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2813 "Modify Memory Contents", 0,
2814 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2815 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2816 "Continue Execution", 1,
2817 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2818 kdb_register_flags("rd", kdb_rd, "",
2819 "Display Registers", 0,
2820 KDB_ENABLE_REG_READ);
2821 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2822 "Modify Registers", 0,
2823 KDB_ENABLE_REG_WRITE);
2824 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2825 "Display exception frame", 0,
2826 KDB_ENABLE_MEM_READ);
2827 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2828 "Stack traceback", 1,
2829 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2830 kdb_register_flags("btp", kdb_bt, "<pid>",
2831 "Display stack for process <pid>", 0,
2832 KDB_ENABLE_INSPECT);
2833 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2834 "Backtrace all processes matching state flag", 0,
2835 KDB_ENABLE_INSPECT);
2836 kdb_register_flags("btc", kdb_bt, "",
2837 "Backtrace current process on each cpu", 0,
2838 KDB_ENABLE_INSPECT);
2839 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2840 "Backtrace process given its struct task address", 0,
2841 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2842 kdb_register_flags("env", kdb_env, "",
2843 "Show environment variables", 0,
2844 KDB_ENABLE_ALWAYS_SAFE);
2845 kdb_register_flags("set", kdb_set, "",
2846 "Set environment variables", 0,
2847 KDB_ENABLE_ALWAYS_SAFE);
2848 kdb_register_flags("help", kdb_help, "",
2849 "Display Help Message", 1,
2850 KDB_ENABLE_ALWAYS_SAFE);
2851 kdb_register_flags("?", kdb_help, "",
2852 "Display Help Message", 0,
2853 KDB_ENABLE_ALWAYS_SAFE);
2854 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2855 "Switch to new cpu", 0,
2856 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2857 kdb_register_flags("kgdb", kdb_kgdb, "",
2858 "Enter kgdb mode", 0, 0);
2859 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2860 "Display active task list", 0,
2861 KDB_ENABLE_INSPECT);
2862 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2863 "Switch to another task", 0,
2864 KDB_ENABLE_INSPECT);
2865 kdb_register_flags("reboot", kdb_reboot, "",
2866 "Reboot the machine immediately", 0,
2867 KDB_ENABLE_REBOOT);
2868#if defined(CONFIG_MODULES)
2869 kdb_register_flags("lsmod", kdb_lsmod, "",
2870 "List loaded kernel modules", 0,
2871 KDB_ENABLE_INSPECT);
2872#endif
2873#if defined(CONFIG_MAGIC_SYSRQ)
2874 kdb_register_flags("sr", kdb_sr, "<key>",
2875 "Magic SysRq key", 0,
2876 KDB_ENABLE_ALWAYS_SAFE);
2877#endif
2878#if defined(CONFIG_PRINTK)
2879 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2880 "Display syslog buffer", 0,
2881 KDB_ENABLE_ALWAYS_SAFE);
2882#endif
2883 if (arch_kgdb_ops.enable_nmi) {
2884 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2885 "Disable NMI entry to KDB", 0,
2886 KDB_ENABLE_ALWAYS_SAFE);
2887 }
2888 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2889 "Define a set of commands, down to endefcmd", 0,
2890 KDB_ENABLE_ALWAYS_SAFE);
2891 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2892 "Send a signal to a process", 0,
2893 KDB_ENABLE_SIGNAL);
2894 kdb_register_flags("summary", kdb_summary, "",
2895 "Summarize the system", 4,
2896 KDB_ENABLE_ALWAYS_SAFE);
2897 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2898 "Display per_cpu variables", 3,
2899 KDB_ENABLE_MEM_READ);
2900 kdb_register_flags("grephelp", kdb_grep_help, "",
2901 "Display help on | grep", 0,
2902 KDB_ENABLE_ALWAYS_SAFE);
2903}
2904
2905/* Execute any commands defined in kdb_cmds. */
2906static void __init kdb_cmd_init(void)
2907{
2908 int i, diag;
2909 for (i = 0; kdb_cmds[i]; ++i) {
2910 diag = kdb_parse(kdb_cmds[i]);
2911 if (diag)
2912 kdb_printf("kdb command %s failed, kdb diag %d\n",
2913 kdb_cmds[i], diag);
2914 }
2915 if (defcmd_in_progress) {
2916 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2917 kdb_parse("endefcmd");
2918 }
2919}
2920
2921/* Initialize kdb_printf, breakpoint tables and kdb state */
2922void __init kdb_init(int lvl)
2923{
2924 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2925 int i;
2926
2927 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2928 return;
2929 for (i = kdb_init_lvl; i < lvl; i++) {
2930 switch (i) {
2931 case KDB_NOT_INITIALIZED:
2932 kdb_inittab(); /* Initialize Command Table */
2933 kdb_initbptab(); /* Initialize Breakpoints */
2934 break;
2935 case KDB_INIT_EARLY:
2936 kdb_cmd_init(); /* Build kdb_cmds tables */
2937 break;
2938 }
2939 }
2940 kdb_init_lvl = lvl;
2941}