2 * Kernel Debugger Architecture Independent Main Code
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
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.
14 #include <linux/ctype.h>
15 #include <linux/string.h>
16 #include <linux/kernel.h>
17 #include <linux/kmsg_dump.h>
18 #include <linux/reboot.h>
19 #include <linux/sched.h>
20 #include <linux/sysrq.h>
21 #include <linux/smp.h>
22 #include <linux/utsname.h>
23 #include <linux/vmalloc.h>
24 #include <linux/atomic.h>
25 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/kallsyms.h>
29 #include <linux/kgdb.h>
30 #include <linux/kdb.h>
31 #include <linux/notifier.h>
32 #include <linux/interrupt.h>
33 #include <linux/delay.h>
34 #include <linux/nmi.h>
35 #include <linux/time.h>
36 #include <linux/ptrace.h>
37 #include <linux/sysctl.h>
38 #include <linux/cpu.h>
39 #include <linux/kdebug.h>
40 #include <linux/proc_fs.h>
41 #include <linux/uaccess.h>
42 #include <linux/slab.h>
43 #include "kdb_private.h"
46 char kdb_grep_string
[GREP_LEN
];
47 int kdb_grepping_flag
;
48 EXPORT_SYMBOL(kdb_grepping_flag
);
50 int kdb_grep_trailing
;
53 * Kernel debugger state flags
59 * kdb_lock protects updates to kdb_initial_cpu. Used to
60 * single thread processors through the kernel debugger.
62 int kdb_initial_cpu
= -1; /* cpu number that owns kdb */
64 int kdb_state
; /* General KDB state */
66 struct task_struct
*kdb_current_task
;
67 EXPORT_SYMBOL(kdb_current_task
);
68 struct pt_regs
*kdb_current_regs
;
70 const char *kdb_diemsg
;
71 static int kdb_go_count
;
72 #ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
73 static unsigned int kdb_continue_catastrophic
=
74 CONFIG_KDB_CONTINUE_CATASTROPHIC
;
76 static unsigned int kdb_continue_catastrophic
;
79 /* kdb_commands describes the available commands. */
80 static kdbtab_t
*kdb_commands
;
81 #define KDB_BASE_CMD_MAX 50
82 static int kdb_max_commands
= KDB_BASE_CMD_MAX
;
83 static kdbtab_t kdb_base_commands
[KDB_BASE_CMD_MAX
];
84 #define for_each_kdbcmd(cmd, num) \
85 for ((cmd) = kdb_base_commands, (num) = 0; \
86 num < kdb_max_commands; \
87 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
89 typedef struct _kdbmsg
{
90 int km_diag
; /* kdb diagnostic */
91 char *km_msg
; /* Corresponding message text */
94 #define KDBMSG(msgnum, text) \
95 { KDB_##msgnum, text }
97 static kdbmsg_t kdbmsgs
[] = {
98 KDBMSG(NOTFOUND
, "Command Not Found"),
99 KDBMSG(ARGCOUNT
, "Improper argument count, see usage."),
100 KDBMSG(BADWIDTH
, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
101 "8 is only allowed on 64 bit systems"),
102 KDBMSG(BADRADIX
, "Illegal value for RADIX use 8, 10 or 16"),
103 KDBMSG(NOTENV
, "Cannot find environment variable"),
104 KDBMSG(NOENVVALUE
, "Environment variable should have value"),
105 KDBMSG(NOTIMP
, "Command not implemented"),
106 KDBMSG(ENVFULL
, "Environment full"),
107 KDBMSG(ENVBUFFULL
, "Environment buffer full"),
108 KDBMSG(TOOMANYBPT
, "Too many breakpoints defined"),
109 #ifdef CONFIG_CPU_XSCALE
110 KDBMSG(TOOMANYDBREGS
, "More breakpoints than ibcr registers defined"),
112 KDBMSG(TOOMANYDBREGS
, "More breakpoints than db registers defined"),
114 KDBMSG(DUPBPT
, "Duplicate breakpoint address"),
115 KDBMSG(BPTNOTFOUND
, "Breakpoint not found"),
116 KDBMSG(BADMODE
, "Invalid IDMODE"),
117 KDBMSG(BADINT
, "Illegal numeric value"),
118 KDBMSG(INVADDRFMT
, "Invalid symbolic address format"),
119 KDBMSG(BADREG
, "Invalid register name"),
120 KDBMSG(BADCPUNUM
, "Invalid cpu number"),
121 KDBMSG(BADLENGTH
, "Invalid length field"),
122 KDBMSG(NOBP
, "No Breakpoint exists"),
123 KDBMSG(BADADDR
, "Invalid address"),
127 static const int __nkdb_err
= ARRAY_SIZE(kdbmsgs
);
131 * Initial environment. This is all kept static and local to
132 * this file. We don't want to rely on the memory allocation
133 * mechanisms in the kernel, so we use a very limited allocate-only
134 * heap for new and altered environment variables. The entire
135 * environment is limited to a fixed number of entries (add more
136 * to __env[] if required) and a fixed amount of heap (add more to
137 * KDB_ENVBUFSIZE if required).
140 static char *__env
[] = {
141 #if defined(CONFIG_SMP)
148 "MDCOUNT=8", /* lines of md output */
178 static const int __nenv
= ARRAY_SIZE(__env
);
180 struct task_struct
*kdb_curr_task(int cpu
)
182 struct task_struct
*p
= curr_task(cpu
);
184 if ((task_thread_info(p
)->flags
& _TIF_MCA_INIT
) && KDB_TSK(cpu
))
191 * kdbgetenv - This function will return the character string value of
192 * an environment variable.
194 * match A character string representing an environment variable.
196 * NULL No environment variable matches 'match'
197 * char* Pointer to string value of environment variable.
199 char *kdbgetenv(const char *match
)
202 int matchlen
= strlen(match
);
205 for (i
= 0; i
< __nenv
; i
++) {
211 if ((strncmp(match
, e
, matchlen
) == 0)
212 && ((e
[matchlen
] == '\0')
213 || (e
[matchlen
] == '='))) {
214 char *cp
= strchr(e
, '=');
215 return cp
? ++cp
: "";
222 * kdballocenv - This function is used to allocate bytes for
223 * environment entries.
225 * match A character string representing a numeric value
227 * *value the unsigned long representation of the env variable 'match'
229 * Zero on success, a kdb diagnostic on failure.
231 * We use a static environment buffer (envbuffer) to hold the values
232 * of dynamically generated environment variables (see kdb_set). Buffer
233 * space once allocated is never free'd, so over time, the amount of space
234 * (currently 512 bytes) will be exhausted if env variables are changed
237 static char *kdballocenv(size_t bytes
)
239 #define KDB_ENVBUFSIZE 512
240 static char envbuffer
[KDB_ENVBUFSIZE
];
241 static int envbufsize
;
244 if ((KDB_ENVBUFSIZE
- envbufsize
) >= bytes
) {
245 ep
= &envbuffer
[envbufsize
];
252 * kdbgetulenv - This function will return the value of an unsigned
253 * long-valued environment variable.
255 * match A character string representing a numeric value
257 * *value the unsigned long represntation of the env variable 'match'
259 * Zero on success, a kdb diagnostic on failure.
261 static int kdbgetulenv(const char *match
, unsigned long *value
)
265 ep
= kdbgetenv(match
);
269 return KDB_NOENVVALUE
;
271 *value
= simple_strtoul(ep
, NULL
, 0);
277 * kdbgetintenv - This function will return the value of an
278 * integer-valued environment variable.
280 * match A character string representing an integer-valued env variable
282 * *value the integer representation of the environment variable 'match'
284 * Zero on success, a kdb diagnostic on failure.
286 int kdbgetintenv(const char *match
, int *value
)
291 diag
= kdbgetulenv(match
, &val
);
298 * kdbgetularg - This function will convert a numeric string into an
299 * unsigned long value.
301 * arg A character string representing a numeric value
303 * *value the unsigned long represntation of arg.
305 * Zero on success, a kdb diagnostic on failure.
307 int kdbgetularg(const char *arg
, unsigned long *value
)
312 val
= simple_strtoul(arg
, &endp
, 0);
316 * Also try base 16, for us folks too lazy to type the
319 val
= simple_strtoul(arg
, &endp
, 16);
329 int kdbgetu64arg(const char *arg
, u64
*value
)
334 val
= simple_strtoull(arg
, &endp
, 0);
338 val
= simple_strtoull(arg
, &endp
, 16);
349 * kdb_set - This function implements the 'set' command. Alter an
350 * existing environment variable or create a new one.
352 int kdb_set(int argc
, const char **argv
)
356 size_t varlen
, vallen
;
359 * we can be invoked two ways:
360 * set var=value argv[1]="var", argv[2]="value"
361 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
362 * - if the latter, shift 'em down.
373 * Check for internal variables
375 if (strcmp(argv
[1], "KDBDEBUG") == 0) {
376 unsigned int debugflags
;
379 debugflags
= simple_strtoul(argv
[2], &cp
, 0);
380 if (cp
== argv
[2] || debugflags
& ~KDB_DEBUG_FLAG_MASK
) {
381 kdb_printf("kdb: illegal debug flags '%s'\n",
385 kdb_flags
= (kdb_flags
&
386 ~(KDB_DEBUG_FLAG_MASK
<< KDB_DEBUG_FLAG_SHIFT
))
387 | (debugflags
<< KDB_DEBUG_FLAG_SHIFT
);
393 * Tokenizer squashed the '=' sign. argv[1] is variable
394 * name, argv[2] = value.
396 varlen
= strlen(argv
[1]);
397 vallen
= strlen(argv
[2]);
398 ep
= kdballocenv(varlen
+ vallen
+ 2);
400 return KDB_ENVBUFFULL
;
402 sprintf(ep
, "%s=%s", argv
[1], argv
[2]);
404 ep
[varlen
+vallen
+1] = '\0';
406 for (i
= 0; i
< __nenv
; i
++) {
408 && ((strncmp(__env
[i
], argv
[1], varlen
) == 0)
409 && ((__env
[i
][varlen
] == '\0')
410 || (__env
[i
][varlen
] == '=')))) {
417 * Wasn't existing variable. Fit into slot.
419 for (i
= 0; i
< __nenv
-1; i
++) {
420 if (__env
[i
] == (char *)0) {
429 static int kdb_check_regs(void)
431 if (!kdb_current_regs
) {
432 kdb_printf("No current kdb registers."
433 " You may need to select another task\n");
440 * kdbgetaddrarg - This function is responsible for parsing an
441 * address-expression and returning the value of the expression,
442 * symbol name, and offset to the caller.
444 * The argument may consist of a numeric value (decimal or
445 * hexidecimal), a symbol name, a register name (preceded by the
446 * percent sign), an environment variable with a numeric value
447 * (preceded by a dollar sign) or a simple arithmetic expression
448 * consisting of a symbol name, +/-, and a numeric constant value
451 * argc - count of arguments in argv
452 * argv - argument vector
453 * *nextarg - index to next unparsed argument in argv[]
454 * regs - Register state at time of KDB entry
456 * *value - receives the value of the address-expression
457 * *offset - receives the offset specified, if any
458 * *name - receives the symbol name, if any
459 * *nextarg - index to next unparsed argument in argv[]
461 * zero is returned on success, a kdb diagnostic code is
464 int kdbgetaddrarg(int argc
, const char **argv
, int *nextarg
,
465 unsigned long *value
, long *offset
,
469 unsigned long off
= 0;
479 * Process arguments which follow the following syntax:
481 * symbol | numeric-address [+/- numeric-offset]
483 * $environment-variable
489 symname
= (char *)argv
[*nextarg
];
492 * If there is no whitespace between the symbol
493 * or address and the '+' or '-' symbols, we
494 * remember the character and replace it with a
495 * null so the symbol/value can be properly parsed
497 cp
= strpbrk(symname
, "+-");
503 if (symname
[0] == '$') {
504 diag
= kdbgetulenv(&symname
[1], &addr
);
507 } else if (symname
[0] == '%') {
508 diag
= kdb_check_regs();
511 /* Implement register values with % at a later time as it is
516 found
= kdbgetsymval(symname
, &symtab
);
518 addr
= symtab
.sym_start
;
520 diag
= kdbgetularg(argv
[*nextarg
], &addr
);
527 found
= kdbnearsym(addr
, &symtab
);
535 if (offset
&& name
&& *name
)
536 *offset
= addr
- symtab
.sym_start
;
538 if ((*nextarg
> argc
)
543 * check for +/- and offset
546 if (symbol
== '\0') {
547 if ((argv
[*nextarg
][0] != '+')
548 && (argv
[*nextarg
][0] != '-')) {
550 * Not our argument. Return.
554 positive
= (argv
[*nextarg
][0] == '+');
558 positive
= (symbol
== '+');
561 * Now there must be an offset!
563 if ((*nextarg
> argc
)
564 && (symbol
== '\0')) {
565 return KDB_INVADDRFMT
;
569 cp
= (char *)argv
[*nextarg
];
573 diag
= kdbgetularg(cp
, &off
);
589 static void kdb_cmderror(int diag
)
594 kdb_printf("no error detected (diagnostic is %d)\n", diag
);
598 for (i
= 0; i
< __nkdb_err
; i
++) {
599 if (kdbmsgs
[i
].km_diag
== diag
) {
600 kdb_printf("diag: %d: %s\n", diag
, kdbmsgs
[i
].km_msg
);
605 kdb_printf("Unknown diag %d\n", -diag
);
609 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
610 * command which defines one command as a set of other commands,
611 * terminated by endefcmd. kdb_defcmd processes the initial
612 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
613 * the following commands until 'endefcmd'.
615 * argc argument count
616 * argv argument vector
618 * zero for success, a kdb diagnostic if error
628 static struct defcmd_set
*defcmd_set
;
629 static int defcmd_set_count
;
630 static int defcmd_in_progress
;
632 /* Forward references */
633 static int kdb_exec_defcmd(int argc
, const char **argv
);
635 static int kdb_defcmd2(const char *cmdstr
, const char *argv0
)
637 struct defcmd_set
*s
= defcmd_set
+ defcmd_set_count
- 1;
638 char **save_command
= s
->command
;
639 if (strcmp(argv0
, "endefcmd") == 0) {
640 defcmd_in_progress
= 0;
644 kdb_register(s
->name
, kdb_exec_defcmd
,
645 s
->usage
, s
->help
, 0);
650 s
->command
= kzalloc((s
->count
+ 1) * sizeof(*(s
->command
)), GFP_KDB
);
652 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
657 memcpy(s
->command
, save_command
, s
->count
* sizeof(*(s
->command
)));
658 s
->command
[s
->count
++] = kdb_strdup(cmdstr
, GFP_KDB
);
663 static int kdb_defcmd(int argc
, const char **argv
)
665 struct defcmd_set
*save_defcmd_set
= defcmd_set
, *s
;
666 if (defcmd_in_progress
) {
667 kdb_printf("kdb: nested defcmd detected, assuming missing "
669 kdb_defcmd2("endefcmd", "endefcmd");
673 for (s
= defcmd_set
; s
< defcmd_set
+ defcmd_set_count
; ++s
) {
674 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s
->name
,
676 for (i
= 0; i
< s
->count
; ++i
)
677 kdb_printf("%s", s
->command
[i
]);
678 kdb_printf("endefcmd\n");
684 if (in_dbg_master()) {
685 kdb_printf("Command only available during kdb_init()\n");
688 defcmd_set
= kmalloc((defcmd_set_count
+ 1) * sizeof(*defcmd_set
),
692 memcpy(defcmd_set
, save_defcmd_set
,
693 defcmd_set_count
* sizeof(*defcmd_set
));
694 s
= defcmd_set
+ defcmd_set_count
;
695 memset(s
, 0, sizeof(*s
));
697 s
->name
= kdb_strdup(argv
[1], GFP_KDB
);
700 s
->usage
= kdb_strdup(argv
[2], GFP_KDB
);
703 s
->help
= kdb_strdup(argv
[3], GFP_KDB
);
706 if (s
->usage
[0] == '"') {
707 strcpy(s
->usage
, argv
[2]+1);
708 s
->usage
[strlen(s
->usage
)-1] = '\0';
710 if (s
->help
[0] == '"') {
711 strcpy(s
->help
, argv
[3]+1);
712 s
->help
[strlen(s
->help
)-1] = '\0';
715 defcmd_in_progress
= 1;
716 kfree(save_defcmd_set
);
725 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv
[1]);
726 defcmd_set
= save_defcmd_set
;
731 * kdb_exec_defcmd - Execute the set of commands associated with this
734 * argc argument count
735 * argv argument vector
737 * zero for success, a kdb diagnostic if error
739 static int kdb_exec_defcmd(int argc
, const char **argv
)
742 struct defcmd_set
*s
;
745 for (s
= defcmd_set
, i
= 0; i
< defcmd_set_count
; ++i
, ++s
) {
746 if (strcmp(s
->name
, argv
[0]) == 0)
749 if (i
== defcmd_set_count
) {
750 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
754 for (i
= 0; i
< s
->count
; ++i
) {
755 /* Recursive use of kdb_parse, do not use argv after
758 kdb_printf("[%s]kdb> %s\n", s
->name
, s
->command
[i
]);
759 ret
= kdb_parse(s
->command
[i
]);
766 /* Command history */
767 #define KDB_CMD_HISTORY_COUNT 32
768 #define CMD_BUFLEN 200 /* kdb_printf: max printline
770 static unsigned int cmd_head
, cmd_tail
;
771 static unsigned int cmdptr
;
772 static char cmd_hist
[KDB_CMD_HISTORY_COUNT
][CMD_BUFLEN
];
773 static char cmd_cur
[CMD_BUFLEN
];
776 * The "str" argument may point to something like | grep xyz
778 static void parse_grep(const char *str
)
781 char *cp
= (char *)str
, *cp2
;
783 /* sanity check: we should have been called with the \ first */
789 if (strncmp(cp
, "grep ", 5)) {
790 kdb_printf("invalid 'pipe', see grephelp\n");
796 cp2
= strchr(cp
, '\n');
798 *cp2
= '\0'; /* remove the trailing newline */
801 kdb_printf("invalid 'pipe', see grephelp\n");
804 /* now cp points to a nonzero length search string */
806 /* allow it be "x y z" by removing the "'s - there must
809 cp2
= strchr(cp
, '"');
811 kdb_printf("invalid quoted string, see grephelp\n");
814 *cp2
= '\0'; /* end the string where the 2nd " was */
816 kdb_grep_leading
= 0;
818 kdb_grep_leading
= 1;
822 kdb_grep_trailing
= 0;
823 if (*(cp
+len
-1) == '$') {
824 kdb_grep_trailing
= 1;
830 if (len
>= GREP_LEN
) {
831 kdb_printf("search string too long\n");
834 strcpy(kdb_grep_string
, cp
);
840 * kdb_parse - Parse the command line, search the command table for a
841 * matching command and invoke the command function. This
842 * function may be called recursively, if it is, the second call
843 * will overwrite argv and cbuf. It is the caller's
844 * responsibility to save their argv if they recursively call
847 * cmdstr The input command line to be parsed.
848 * regs The registers at the time kdb was entered.
850 * Zero for success, a kdb diagnostic if failure.
852 * Limited to 20 tokens.
854 * Real rudimentary tokenization. Basically only whitespace
855 * is considered a token delimeter (but special consideration
856 * is taken of the '=' sign as used by the 'set' command).
858 * The algorithm used to tokenize the input string relies on
859 * there being at least one whitespace (or otherwise useless)
860 * character between tokens as the character immediately following
861 * the token is altered in-place to a null-byte to terminate the
867 int kdb_parse(const char *cmdstr
)
869 static char *argv
[MAXARGC
];
871 static char cbuf
[CMD_BUFLEN
+2];
875 int i
, escaped
, ignore_errors
= 0, check_grep
;
878 * First tokenize the command string.
881 kdb_grepping_flag
= check_grep
= 0;
883 if (KDB_FLAG(CMD_INTERRUPT
)) {
884 /* Previous command was interrupted, newline must not
885 * repeat the command */
886 KDB_FLAG_CLEAR(CMD_INTERRUPT
);
887 KDB_STATE_SET(PAGER
);
888 argc
= 0; /* no repeat */
891 if (*cp
!= '\n' && *cp
!= '\0') {
895 /* skip whitespace */
898 if ((*cp
== '\0') || (*cp
== '\n') ||
899 (*cp
== '#' && !defcmd_in_progress
))
901 /* special case: check for | grep pattern */
906 if (cpp
>= cbuf
+ CMD_BUFLEN
) {
907 kdb_printf("kdb_parse: command buffer "
908 "overflow, command ignored\n%s\n",
912 if (argc
>= MAXARGC
- 1) {
913 kdb_printf("kdb_parse: too many arguments, "
914 "command ignored\n%s\n", cmdstr
);
920 /* Copy to next unquoted and unescaped
921 * whitespace or '=' */
922 while (*cp
&& *cp
!= '\n' &&
923 (escaped
|| quoted
|| !isspace(*cp
))) {
924 if (cpp
>= cbuf
+ CMD_BUFLEN
)
938 else if (*cp
== '\'' || *cp
== '"')
941 if (*cpp
== '=' && !quoted
)
945 *cpp
++ = '\0'; /* Squash a ws or '=' character */
952 if (defcmd_in_progress
) {
953 int result
= kdb_defcmd2(cmdstr
, argv
[0]);
954 if (!defcmd_in_progress
) {
955 argc
= 0; /* avoid repeat on endefcmd */
960 if (argv
[0][0] == '-' && argv
[0][1] &&
961 (argv
[0][1] < '0' || argv
[0][1] > '9')) {
966 for_each_kdbcmd(tp
, i
) {
969 * If this command is allowed to be abbreviated,
970 * check to see if this is it.
974 && (strlen(argv
[0]) <= tp
->cmd_minlen
)) {
977 tp
->cmd_minlen
) == 0) {
982 if (strcmp(argv
[0], tp
->cmd_name
) == 0)
988 * If we don't find a command by this name, see if the first
989 * few characters of this match any of the known commands.
990 * e.g., md1c20 should match md.
992 if (i
== kdb_max_commands
) {
993 for_each_kdbcmd(tp
, i
) {
997 strlen(tp
->cmd_name
)) == 0) {
1004 if (i
< kdb_max_commands
) {
1007 result
= (*tp
->cmd_func
)(argc
-1, (const char **)argv
);
1008 if (result
&& ignore_errors
&& result
> KDB_CMD_GO
)
1010 KDB_STATE_CLEAR(CMD
);
1012 if (tp
->cmd_flags
& KDB_REPEAT_WITH_ARGS
)
1015 argc
= tp
->cmd_flags
& KDB_REPEAT_NO_ARGS
? 1 : 0;
1017 *(argv
[argc
]) = '\0';
1022 * If the input with which we were presented does not
1023 * map to an existing command, attempt to parse it as an
1024 * address argument and display the result. Useful for
1025 * obtaining the address of a variable, or the nearest symbol
1026 * to an address contained in a register.
1029 unsigned long value
;
1034 if (kdbgetaddrarg(0, (const char **)argv
, &nextarg
,
1035 &value
, &offset
, &name
)) {
1036 return KDB_NOTFOUND
;
1039 kdb_printf("%s = ", argv
[0]);
1040 kdb_symbol_print(value
, NULL
, KDB_SP_DEFAULT
);
1047 static int handle_ctrl_cmd(char *cmd
)
1052 /* initial situation */
1053 if (cmd_head
== cmd_tail
)
1057 if (cmdptr
!= cmd_tail
)
1058 cmdptr
= (cmdptr
-1) % KDB_CMD_HISTORY_COUNT
;
1059 strncpy(cmd_cur
, cmd_hist
[cmdptr
], CMD_BUFLEN
);
1062 if (cmdptr
!= cmd_head
)
1063 cmdptr
= (cmdptr
+1) % KDB_CMD_HISTORY_COUNT
;
1064 strncpy(cmd_cur
, cmd_hist
[cmdptr
], CMD_BUFLEN
);
1071 * kdb_reboot - This function implements the 'reboot' command. Reboot
1072 * the system immediately, or loop for ever on failure.
1074 static int kdb_reboot(int argc
, const char **argv
)
1076 emergency_restart();
1077 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1084 static void kdb_dumpregs(struct pt_regs
*regs
)
1086 int old_lvl
= console_loglevel
;
1087 console_loglevel
= CONSOLE_LOGLEVEL_MOTORMOUTH
;
1092 console_loglevel
= old_lvl
;
1095 void kdb_set_current_task(struct task_struct
*p
)
1097 kdb_current_task
= p
;
1099 if (kdb_task_has_cpu(p
)) {
1100 kdb_current_regs
= KDB_TSKREGS(kdb_process_cpu(p
));
1103 kdb_current_regs
= NULL
;
1107 * kdb_local - The main code for kdb. This routine is invoked on a
1108 * specific processor, it is not global. The main kdb() routine
1109 * ensures that only one processor at a time is in this routine.
1110 * This code is called with the real reason code on the first
1111 * entry to a kdb session, thereafter it is called with reason
1112 * SWITCH, even if the user goes back to the original cpu.
1114 * reason The reason KDB was invoked
1115 * error The hardware-defined error code
1116 * regs The exception frame at time of fault/breakpoint.
1117 * db_result Result code from the break or debug point.
1119 * 0 KDB was invoked for an event which it wasn't responsible
1120 * 1 KDB handled the event for which it was invoked.
1121 * KDB_CMD_GO User typed 'go'.
1122 * KDB_CMD_CPU User switched to another cpu.
1123 * KDB_CMD_SS Single step.
1125 static int kdb_local(kdb_reason_t reason
, int error
, struct pt_regs
*regs
,
1126 kdb_dbtrap_t db_result
)
1130 struct task_struct
*kdb_current
=
1131 kdb_curr_task(raw_smp_processor_id());
1133 KDB_DEBUG_STATE("kdb_local 1", reason
);
1135 if (reason
== KDB_REASON_DEBUG
) {
1136 /* special case below */
1138 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1139 kdb_current
, kdb_current
? kdb_current
->pid
: 0);
1140 #if defined(CONFIG_SMP)
1141 kdb_printf("on processor %d ", raw_smp_processor_id());
1146 case KDB_REASON_DEBUG
:
1149 * If re-entering kdb after a single step
1150 * command, don't print the message.
1152 switch (db_result
) {
1154 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1155 kdb_current
, kdb_current
->pid
);
1156 #if defined(CONFIG_SMP)
1157 kdb_printf("on processor %d ", raw_smp_processor_id());
1159 kdb_printf("due to Debug @ " kdb_machreg_fmt
"\n",
1160 instruction_pointer(regs
));
1165 KDB_DEBUG_STATE("kdb_local 4", reason
);
1166 return 1; /* kdba_db_trap did the work */
1168 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1175 case KDB_REASON_ENTER
:
1176 if (KDB_STATE(KEYBOARD
))
1177 kdb_printf("due to Keyboard Entry\n");
1179 kdb_printf("due to KDB_ENTER()\n");
1181 case KDB_REASON_KEYBOARD
:
1182 KDB_STATE_SET(KEYBOARD
);
1183 kdb_printf("due to Keyboard Entry\n");
1185 case KDB_REASON_ENTER_SLAVE
:
1186 /* drop through, slaves only get released via cpu switch */
1187 case KDB_REASON_SWITCH
:
1188 kdb_printf("due to cpu switch\n");
1190 case KDB_REASON_OOPS
:
1191 kdb_printf("Oops: %s\n", kdb_diemsg
);
1192 kdb_printf("due to oops @ " kdb_machreg_fmt
"\n",
1193 instruction_pointer(regs
));
1196 case KDB_REASON_SYSTEM_NMI
:
1197 kdb_printf("due to System NonMaskable Interrupt\n");
1199 case KDB_REASON_NMI
:
1200 kdb_printf("due to NonMaskable Interrupt @ "
1201 kdb_machreg_fmt
"\n",
1202 instruction_pointer(regs
));
1205 case KDB_REASON_SSTEP
:
1206 case KDB_REASON_BREAK
:
1207 kdb_printf("due to %s @ " kdb_machreg_fmt
"\n",
1208 reason
== KDB_REASON_BREAK
?
1209 "Breakpoint" : "SS trap", instruction_pointer(regs
));
1211 * Determine if this breakpoint is one that we
1212 * are interested in.
1214 if (db_result
!= KDB_DB_BPT
) {
1215 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1217 KDB_DEBUG_STATE("kdb_local 6", reason
);
1218 return 0; /* Not for us, dismiss it */
1221 case KDB_REASON_RECURSE
:
1222 kdb_printf("due to Recursion @ " kdb_machreg_fmt
"\n",
1223 instruction_pointer(regs
));
1226 kdb_printf("kdb: unexpected reason code: %d\n", reason
);
1227 KDB_DEBUG_STATE("kdb_local 8", reason
);
1228 return 0; /* Not for us, dismiss it */
1233 * Initialize pager context.
1236 KDB_STATE_CLEAR(SUPPRESS
);
1240 *(cmd_hist
[cmd_head
]) = '\0';
1243 #if defined(CONFIG_SMP)
1244 snprintf(kdb_prompt_str
, CMD_BUFLEN
, kdbgetenv("PROMPT"),
1245 raw_smp_processor_id());
1247 snprintf(kdb_prompt_str
, CMD_BUFLEN
, kdbgetenv("PROMPT"));
1249 if (defcmd_in_progress
)
1250 strncat(kdb_prompt_str
, "[defcmd]", CMD_BUFLEN
);
1253 * Fetch command from keyboard
1255 cmdbuf
= kdb_getstr(cmdbuf
, CMD_BUFLEN
, kdb_prompt_str
);
1256 if (*cmdbuf
!= '\n') {
1258 if (cmdptr
== cmd_head
) {
1259 strncpy(cmd_hist
[cmd_head
], cmd_cur
,
1261 *(cmd_hist
[cmd_head
] +
1262 strlen(cmd_hist
[cmd_head
])-1) = '\0';
1264 if (!handle_ctrl_cmd(cmdbuf
))
1265 *(cmd_cur
+strlen(cmd_cur
)-1) = '\0';
1267 goto do_full_getstr
;
1269 strncpy(cmd_hist
[cmd_head
], cmd_cur
,
1273 cmd_head
= (cmd_head
+1) % KDB_CMD_HISTORY_COUNT
;
1274 if (cmd_head
== cmd_tail
)
1275 cmd_tail
= (cmd_tail
+1) % KDB_CMD_HISTORY_COUNT
;
1279 diag
= kdb_parse(cmdbuf
);
1280 if (diag
== KDB_NOTFOUND
) {
1281 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf
);
1284 if (diag
== KDB_CMD_GO
1285 || diag
== KDB_CMD_CPU
1286 || diag
== KDB_CMD_SS
1287 || diag
== KDB_CMD_KGDB
)
1293 KDB_DEBUG_STATE("kdb_local 9", diag
);
1299 * kdb_print_state - Print the state data for the current processor
1302 * text Identifies the debug point
1303 * value Any integer value to be printed, e.g. reason code.
1305 void kdb_print_state(const char *text
, int value
)
1307 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1308 text
, raw_smp_processor_id(), value
, kdb_initial_cpu
,
1313 * kdb_main_loop - After initial setup and assignment of the
1314 * controlling cpu, all cpus are in this loop. One cpu is in
1315 * control and will issue the kdb prompt, the others will spin
1316 * until 'go' or cpu switch.
1318 * To get a consistent view of the kernel stacks for all
1319 * processes, this routine is invoked from the main kdb code via
1320 * an architecture specific routine. kdba_main_loop is
1321 * responsible for making the kernel stacks consistent for all
1322 * processes, there should be no difference between a blocked
1323 * process and a running process as far as kdb is concerned.
1325 * reason The reason KDB was invoked
1326 * error The hardware-defined error code
1327 * reason2 kdb's current reason code.
1328 * Initially error but can change
1329 * according to kdb state.
1330 * db_result Result code from break or debug point.
1331 * regs The exception frame at time of fault/breakpoint.
1332 * should always be valid.
1334 * 0 KDB was invoked for an event which it wasn't responsible
1335 * 1 KDB handled the event for which it was invoked.
1337 int kdb_main_loop(kdb_reason_t reason
, kdb_reason_t reason2
, int error
,
1338 kdb_dbtrap_t db_result
, struct pt_regs
*regs
)
1341 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1344 * All processors except the one that is in control
1347 KDB_DEBUG_STATE("kdb_main_loop 1", reason
);
1348 while (KDB_STATE(HOLD_CPU
)) {
1349 /* state KDB is turned off by kdb_cpu to see if the
1350 * other cpus are still live, each cpu in this loop
1353 if (!KDB_STATE(KDB
))
1357 KDB_STATE_CLEAR(SUPPRESS
);
1358 KDB_DEBUG_STATE("kdb_main_loop 2", reason
);
1359 if (KDB_STATE(LEAVING
))
1360 break; /* Another cpu said 'go' */
1361 /* Still using kdb, this processor is in control */
1362 result
= kdb_local(reason2
, error
, regs
, db_result
);
1363 KDB_DEBUG_STATE("kdb_main_loop 3", result
);
1365 if (result
== KDB_CMD_CPU
)
1368 if (result
== KDB_CMD_SS
) {
1369 KDB_STATE_SET(DOING_SS
);
1373 if (result
== KDB_CMD_KGDB
) {
1374 if (!KDB_STATE(DOING_KGDB
))
1375 kdb_printf("Entering please attach debugger "
1376 "or use $D#44+ or $3#33\n");
1379 if (result
&& result
!= 1 && result
!= KDB_CMD_GO
)
1380 kdb_printf("\nUnexpected kdb_local return code %d\n",
1382 KDB_DEBUG_STATE("kdb_main_loop 4", reason
);
1385 if (KDB_STATE(DOING_SS
))
1386 KDB_STATE_CLEAR(SSBPT
);
1388 /* Clean up any keyboard devices before leaving */
1389 kdb_kbd_cleanup_state();
1395 * kdb_mdr - This function implements the guts of the 'mdr', memory
1397 * mdr <addr arg>,<byte count>
1399 * addr Start address
1400 * count Number of bytes
1402 * Always 0. Any errors are detected and printed by kdb_getarea.
1404 static int kdb_mdr(unsigned long addr
, unsigned int count
)
1408 if (kdb_getarea(c
, addr
))
1410 kdb_printf("%02x", c
);
1418 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1419 * 'md8' 'mdr' and 'mds' commands.
1421 * md|mds [<addr arg> [<line count> [<radix>]]]
1422 * mdWcN [<addr arg> [<line count> [<radix>]]]
1423 * where W = is the width (1, 2, 4 or 8) and N is the count.
1424 * for eg., md1c20 reads 20 bytes, 1 at a time.
1425 * mdr <addr arg>,<byte count>
1427 static void kdb_md_line(const char *fmtstr
, unsigned long addr
,
1428 int symbolic
, int nosect
, int bytesperword
,
1429 int num
, int repeat
, int phys
)
1431 /* print just one line of data */
1432 kdb_symtab_t symtab
;
1438 memset(cbuf
, '\0', sizeof(cbuf
));
1440 kdb_printf("phys " kdb_machreg_fmt0
" ", addr
);
1442 kdb_printf(kdb_machreg_fmt0
" ", addr
);
1444 for (i
= 0; i
< num
&& repeat
--; i
++) {
1446 if (kdb_getphysword(&word
, addr
, bytesperword
))
1448 } else if (kdb_getword(&word
, addr
, bytesperword
))
1450 kdb_printf(fmtstr
, word
);
1452 kdbnearsym(word
, &symtab
);
1454 memset(&symtab
, 0, sizeof(symtab
));
1455 if (symtab
.sym_name
) {
1456 kdb_symbol_print(word
, &symtab
, 0);
1459 kdb_printf(" %s %s "
1462 kdb_machreg_fmt
, symtab
.mod_name
,
1463 symtab
.sec_name
, symtab
.sec_start
,
1464 symtab
.sym_start
, symtab
.sym_end
);
1466 addr
+= bytesperword
;
1474 cp
= wc
.c
+ 8 - bytesperword
;
1479 #define printable_char(c) \
1480 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1481 switch (bytesperword
) {
1483 *c
++ = printable_char(*cp
++);
1484 *c
++ = printable_char(*cp
++);
1485 *c
++ = printable_char(*cp
++);
1486 *c
++ = printable_char(*cp
++);
1489 *c
++ = printable_char(*cp
++);
1490 *c
++ = printable_char(*cp
++);
1493 *c
++ = printable_char(*cp
++);
1496 *c
++ = printable_char(*cp
++);
1500 #undef printable_char
1503 kdb_printf("%*s %s\n", (int)((num
-i
)*(2*bytesperword
+ 1)+1),
1507 static int kdb_md(int argc
, const char **argv
)
1509 static unsigned long last_addr
;
1510 static int last_radix
, last_bytesperword
, last_repeat
;
1511 int radix
= 16, mdcount
= 8, bytesperword
= KDB_WORD_SIZE
, repeat
;
1513 char fmtchar
, fmtstr
[64];
1521 kdbgetintenv("MDCOUNT", &mdcount
);
1522 kdbgetintenv("RADIX", &radix
);
1523 kdbgetintenv("BYTESPERWORD", &bytesperword
);
1525 /* Assume 'md <addr>' and start with environment values */
1526 repeat
= mdcount
* 16 / bytesperword
;
1528 if (strcmp(argv
[0], "mdr") == 0) {
1530 return KDB_ARGCOUNT
;
1532 } else if (isdigit(argv
[0][2])) {
1533 bytesperword
= (int)(argv
[0][2] - '0');
1534 if (bytesperword
== 0) {
1535 bytesperword
= last_bytesperword
;
1536 if (bytesperword
== 0)
1539 last_bytesperword
= bytesperword
;
1540 repeat
= mdcount
* 16 / bytesperword
;
1543 else if (argv
[0][3] == 'c' && argv
[0][4]) {
1545 repeat
= simple_strtoul(argv
[0] + 4, &p
, 10);
1546 mdcount
= ((repeat
* bytesperword
) + 15) / 16;
1549 last_repeat
= repeat
;
1550 } else if (strcmp(argv
[0], "md") == 0)
1552 else if (strcmp(argv
[0], "mds") == 0)
1554 else if (strcmp(argv
[0], "mdp") == 0) {
1558 return KDB_NOTFOUND
;
1562 return KDB_ARGCOUNT
;
1565 bytesperword
= last_bytesperword
;
1566 repeat
= last_repeat
;
1567 mdcount
= ((repeat
* bytesperword
) + 15) / 16;
1572 int diag
, nextarg
= 1;
1573 diag
= kdbgetaddrarg(argc
, argv
, &nextarg
, &addr
,
1577 if (argc
> nextarg
+2)
1578 return KDB_ARGCOUNT
;
1580 if (argc
>= nextarg
) {
1581 diag
= kdbgetularg(argv
[nextarg
], &val
);
1583 mdcount
= (int) val
;
1584 repeat
= mdcount
* 16 / bytesperword
;
1587 if (argc
>= nextarg
+1) {
1588 diag
= kdbgetularg(argv
[nextarg
+1], &val
);
1594 if (strcmp(argv
[0], "mdr") == 0)
1595 return kdb_mdr(addr
, mdcount
);
1608 return KDB_BADRADIX
;
1613 if (bytesperword
> KDB_WORD_SIZE
)
1614 return KDB_BADWIDTH
;
1616 switch (bytesperword
) {
1618 sprintf(fmtstr
, "%%16.16l%c ", fmtchar
);
1621 sprintf(fmtstr
, "%%8.8l%c ", fmtchar
);
1624 sprintf(fmtstr
, "%%4.4l%c ", fmtchar
);
1627 sprintf(fmtstr
, "%%2.2l%c ", fmtchar
);
1630 return KDB_BADWIDTH
;
1633 last_repeat
= repeat
;
1634 last_bytesperword
= bytesperword
;
1636 if (strcmp(argv
[0], "mds") == 0) {
1638 /* Do not save these changes as last_*, they are temporary mds
1641 bytesperword
= KDB_WORD_SIZE
;
1643 kdbgetintenv("NOSECT", &nosect
);
1646 /* Round address down modulo BYTESPERWORD */
1648 addr
&= ~(bytesperword
-1);
1650 while (repeat
> 0) {
1652 int n
, z
, num
= (symbolic
? 1 : (16 / bytesperword
));
1654 if (KDB_FLAG(CMD_INTERRUPT
))
1656 for (a
= addr
, z
= 0; z
< repeat
; a
+= bytesperword
, ++z
) {
1658 if (kdb_getphysword(&word
, a
, bytesperword
)
1661 } else if (kdb_getword(&word
, a
, bytesperword
) || word
)
1664 n
= min(num
, repeat
);
1665 kdb_md_line(fmtstr
, addr
, symbolic
, nosect
, bytesperword
,
1667 addr
+= bytesperword
* n
;
1669 z
= (z
+ num
- 1) / num
;
1671 int s
= num
* (z
-2);
1672 kdb_printf(kdb_machreg_fmt0
"-" kdb_machreg_fmt0
1673 " zero suppressed\n",
1674 addr
, addr
+ bytesperword
* s
- 1);
1675 addr
+= bytesperword
* s
;
1685 * kdb_mm - This function implements the 'mm' command.
1686 * mm address-expression new-value
1688 * mm works on machine words, mmW works on bytes.
1690 static int kdb_mm(int argc
, const char **argv
)
1695 unsigned long contents
;
1699 if (argv
[0][2] && !isdigit(argv
[0][2]))
1700 return KDB_NOTFOUND
;
1703 return KDB_ARGCOUNT
;
1706 diag
= kdbgetaddrarg(argc
, argv
, &nextarg
, &addr
, &offset
, NULL
);
1711 return KDB_ARGCOUNT
;
1712 diag
= kdbgetaddrarg(argc
, argv
, &nextarg
, &contents
, NULL
, NULL
);
1716 if (nextarg
!= argc
+ 1)
1717 return KDB_ARGCOUNT
;
1719 width
= argv
[0][2] ? (argv
[0][2] - '0') : (KDB_WORD_SIZE
);
1720 diag
= kdb_putword(addr
, contents
, width
);
1724 kdb_printf(kdb_machreg_fmt
" = " kdb_machreg_fmt
"\n", addr
, contents
);
1730 * kdb_go - This function implements the 'go' command.
1731 * go [address-expression]
1733 static int kdb_go(int argc
, const char **argv
)
1740 if (raw_smp_processor_id() != kdb_initial_cpu
) {
1741 kdb_printf("go must execute on the entry cpu, "
1742 "please use \"cpu %d\" and then execute go\n",
1744 return KDB_BADCPUNUM
;
1748 diag
= kdbgetaddrarg(argc
, argv
, &nextarg
,
1749 &addr
, &offset
, NULL
);
1753 return KDB_ARGCOUNT
;
1757 if (KDB_FLAG(CATASTROPHIC
)) {
1758 kdb_printf("Catastrophic error detected\n");
1759 kdb_printf("kdb_continue_catastrophic=%d, ",
1760 kdb_continue_catastrophic
);
1761 if (kdb_continue_catastrophic
== 0 && kdb_go_count
++ == 0) {
1762 kdb_printf("type go a second time if you really want "
1766 if (kdb_continue_catastrophic
== 2) {
1767 kdb_printf("forcing reboot\n");
1768 kdb_reboot(0, NULL
);
1770 kdb_printf("attempting to continue\n");
1776 * kdb_rd - This function implements the 'rd' command.
1778 static int kdb_rd(int argc
, const char **argv
)
1780 int len
= kdb_check_regs();
1781 #if DBG_MAX_REG_NUM > 0
1793 for (i
= 0; i
< DBG_MAX_REG_NUM
; i
++) {
1794 rsize
= dbg_reg_def
[i
].size
* 2;
1797 if (len
+ strlen(dbg_reg_def
[i
].name
) + 4 + rsize
> 80) {
1802 len
+= kdb_printf(" ");
1803 switch(dbg_reg_def
[i
].size
* 8) {
1805 rname
= dbg_get_reg(i
, ®8
, kdb_current_regs
);
1808 len
+= kdb_printf("%s: %02x", rname
, reg8
);
1811 rname
= dbg_get_reg(i
, ®16
, kdb_current_regs
);
1814 len
+= kdb_printf("%s: %04x", rname
, reg16
);
1817 rname
= dbg_get_reg(i
, ®32
, kdb_current_regs
);
1820 len
+= kdb_printf("%s: %08x", rname
, reg32
);
1823 rname
= dbg_get_reg(i
, ®64
, kdb_current_regs
);
1826 len
+= kdb_printf("%s: %016llx", rname
, reg64
);
1829 len
+= kdb_printf("%s: ??", dbg_reg_def
[i
].name
);
1837 kdb_dumpregs(kdb_current_regs
);
1843 * kdb_rm - This function implements the 'rm' (register modify) command.
1844 * rm register-name new-contents
1846 * Allows register modification with the same restrictions as gdb
1848 static int kdb_rm(int argc
, const char **argv
)
1850 #if DBG_MAX_REG_NUM > 0
1860 return KDB_ARGCOUNT
;
1862 * Allow presence or absence of leading '%' symbol.
1868 diag
= kdbgetu64arg(argv
[2], ®64
);
1872 diag
= kdb_check_regs();
1877 for (i
= 0; i
< DBG_MAX_REG_NUM
; i
++) {
1878 if (strcmp(rname
, dbg_reg_def
[i
].name
) == 0) {
1884 switch(dbg_reg_def
[i
].size
* 8) {
1887 dbg_set_reg(i
, ®8
, kdb_current_regs
);
1891 dbg_set_reg(i
, ®16
, kdb_current_regs
);
1895 dbg_set_reg(i
, ®32
, kdb_current_regs
);
1898 dbg_set_reg(i
, ®64
, kdb_current_regs
);
1904 kdb_printf("ERROR: Register set currently not implemented\n");
1909 #if defined(CONFIG_MAGIC_SYSRQ)
1911 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1912 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1913 * sr <magic-sysrq-code>
1915 static int kdb_sr(int argc
, const char **argv
)
1918 return KDB_ARGCOUNT
;
1920 __handle_sysrq(*argv
[1], false);
1925 #endif /* CONFIG_MAGIC_SYSRQ */
1928 * kdb_ef - This function implements the 'regs' (display exception
1929 * frame) command. This command takes an address and expects to
1930 * find an exception frame at that address, formats and prints
1932 * regs address-expression
1936 static int kdb_ef(int argc
, const char **argv
)
1944 return KDB_ARGCOUNT
;
1947 diag
= kdbgetaddrarg(argc
, argv
, &nextarg
, &addr
, &offset
, NULL
);
1950 show_regs((struct pt_regs
*)addr
);
1954 #if defined(CONFIG_MODULES)
1956 * kdb_lsmod - This function implements the 'lsmod' command. Lists
1957 * currently loaded kernel modules.
1958 * Mostly taken from userland lsmod.
1960 static int kdb_lsmod(int argc
, const char **argv
)
1965 return KDB_ARGCOUNT
;
1967 kdb_printf("Module Size modstruct Used by\n");
1968 list_for_each_entry(mod
, kdb_modules
, list
) {
1969 if (mod
->state
== MODULE_STATE_UNFORMED
)
1972 kdb_printf("%-20s%8u 0x%p ", mod
->name
,
1973 mod
->core_size
, (void *)mod
);
1974 #ifdef CONFIG_MODULE_UNLOAD
1975 kdb_printf("%4ld ", module_refcount(mod
));
1977 if (mod
->state
== MODULE_STATE_GOING
)
1978 kdb_printf(" (Unloading)");
1979 else if (mod
->state
== MODULE_STATE_COMING
)
1980 kdb_printf(" (Loading)");
1982 kdb_printf(" (Live)");
1983 kdb_printf(" 0x%p", mod
->module_core
);
1985 #ifdef CONFIG_MODULE_UNLOAD
1987 struct module_use
*use
;
1989 list_for_each_entry(use
, &mod
->source_list
,
1991 kdb_printf("%s ", use
->target
->name
);
2000 #endif /* CONFIG_MODULES */
2003 * kdb_env - This function implements the 'env' command. Display the
2004 * current environment variables.
2007 static int kdb_env(int argc
, const char **argv
)
2011 for (i
= 0; i
< __nenv
; i
++) {
2013 kdb_printf("%s\n", __env
[i
]);
2016 if (KDB_DEBUG(MASK
))
2017 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags
);
2022 #ifdef CONFIG_PRINTK
2024 * kdb_dmesg - This function implements the 'dmesg' command to display
2025 * the contents of the syslog buffer.
2026 * dmesg [lines] [adjust]
2028 static int kdb_dmesg(int argc
, const char **argv
)
2036 struct kmsg_dumper dumper
= { .active
= 1 };
2041 return KDB_ARGCOUNT
;
2044 lines
= simple_strtol(argv
[1], &cp
, 0);
2048 adjust
= simple_strtoul(argv
[2], &cp
, 0);
2049 if (*cp
|| adjust
< 0)
2054 /* disable LOGGING if set */
2055 diag
= kdbgetintenv("LOGGING", &logging
);
2056 if (!diag
&& logging
) {
2057 const char *setargs
[] = { "set", "LOGGING", "0" };
2058 kdb_set(2, setargs
);
2061 kmsg_dump_rewind_nolock(&dumper
);
2062 while (kmsg_dump_get_line_nolock(&dumper
, 1, NULL
, 0, NULL
))
2067 kdb_printf("buffer only contains %d lines, nothing "
2069 else if (adjust
- lines
>= n
)
2070 kdb_printf("buffer only contains %d lines, last %d "
2071 "lines printed\n", n
, n
- adjust
);
2074 } else if (lines
> 0) {
2075 skip
= n
- lines
- adjust
;
2078 kdb_printf("buffer only contains %d lines, "
2079 "nothing printed\n", n
);
2081 } else if (skip
< 0) {
2084 kdb_printf("buffer only contains %d lines, first "
2085 "%d lines printed\n", n
, lines
);
2091 if (skip
>= n
|| skip
< 0)
2094 kmsg_dump_rewind_nolock(&dumper
);
2095 while (kmsg_dump_get_line_nolock(&dumper
, 1, buf
, sizeof(buf
), &len
)) {
2102 if (KDB_FLAG(CMD_INTERRUPT
))
2105 kdb_printf("%.*s\n", (int)len
- 1, buf
);
2110 #endif /* CONFIG_PRINTK */
2112 /* Make sure we balance enable/disable calls, must disable first. */
2113 static atomic_t kdb_nmi_disabled
;
2115 static int kdb_disable_nmi(int argc
, const char *argv
[])
2117 if (atomic_read(&kdb_nmi_disabled
))
2119 atomic_set(&kdb_nmi_disabled
, 1);
2120 arch_kgdb_ops
.enable_nmi(0);
2124 static int kdb_param_enable_nmi(const char *val
, const struct kernel_param
*kp
)
2126 if (!atomic_add_unless(&kdb_nmi_disabled
, -1, 0))
2128 arch_kgdb_ops
.enable_nmi(1);
2132 static const struct kernel_param_ops kdb_param_ops_enable_nmi
= {
2133 .set
= kdb_param_enable_nmi
,
2135 module_param_cb(enable_nmi
, &kdb_param_ops_enable_nmi
, NULL
, 0600);
2138 * kdb_cpu - This function implements the 'cpu' command.
2141 * KDB_CMD_CPU for success, a kdb diagnostic if error
2143 static void kdb_cpu_status(void)
2145 int i
, start_cpu
, first_print
= 1;
2146 char state
, prev_state
= '?';
2148 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2149 kdb_printf("Available cpus: ");
2150 for (start_cpu
= -1, i
= 0; i
< NR_CPUS
; i
++) {
2151 if (!cpu_online(i
)) {
2152 state
= 'F'; /* cpu is offline */
2154 state
= ' '; /* cpu is responding to kdb */
2155 if (kdb_task_state_char(KDB_TSK(i
)) == 'I')
2156 state
= 'I'; /* idle task */
2158 if (state
!= prev_state
) {
2159 if (prev_state
!= '?') {
2163 kdb_printf("%d", start_cpu
);
2164 if (start_cpu
< i
-1)
2165 kdb_printf("-%d", i
-1);
2166 if (prev_state
!= ' ')
2167 kdb_printf("(%c)", prev_state
);
2173 /* print the trailing cpus, ignoring them if they are all offline */
2174 if (prev_state
!= 'F') {
2177 kdb_printf("%d", start_cpu
);
2178 if (start_cpu
< i
-1)
2179 kdb_printf("-%d", i
-1);
2180 if (prev_state
!= ' ')
2181 kdb_printf("(%c)", prev_state
);
2186 static int kdb_cpu(int argc
, const char **argv
)
2188 unsigned long cpunum
;
2197 return KDB_ARGCOUNT
;
2199 diag
= kdbgetularg(argv
[1], &cpunum
);
2206 if ((cpunum
> NR_CPUS
) || !cpu_online(cpunum
))
2207 return KDB_BADCPUNUM
;
2209 dbg_switch_cpu
= cpunum
;
2212 * Switch to other cpu
2217 /* The user may not realize that ps/bta with no parameters does not print idle
2218 * or sleeping system daemon processes, so tell them how many were suppressed.
2220 void kdb_ps_suppressed(void)
2222 int idle
= 0, daemon
= 0;
2223 unsigned long mask_I
= kdb_task_state_string("I"),
2224 mask_M
= kdb_task_state_string("M");
2226 const struct task_struct
*p
, *g
;
2227 for_each_online_cpu(cpu
) {
2228 p
= kdb_curr_task(cpu
);
2229 if (kdb_task_state(p
, mask_I
))
2232 kdb_do_each_thread(g
, p
) {
2233 if (kdb_task_state(p
, mask_M
))
2235 } kdb_while_each_thread(g
, p
);
2236 if (idle
|| daemon
) {
2238 kdb_printf("%d idle process%s (state I)%s\n",
2239 idle
, idle
== 1 ? "" : "es",
2240 daemon
? " and " : "");
2242 kdb_printf("%d sleeping system daemon (state M) "
2243 "process%s", daemon
,
2244 daemon
== 1 ? "" : "es");
2245 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2250 * kdb_ps - This function implements the 'ps' command which shows a
2251 * list of the active processes.
2252 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2254 void kdb_ps1(const struct task_struct
*p
)
2259 if (!p
|| probe_kernel_read(&tmp
, (char *)p
, sizeof(unsigned long)))
2262 cpu
= kdb_process_cpu(p
);
2263 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2264 (void *)p
, p
->pid
, p
->parent
->pid
,
2265 kdb_task_has_cpu(p
), kdb_process_cpu(p
),
2266 kdb_task_state_char(p
),
2267 (void *)(&p
->thread
),
2268 p
== kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2270 if (kdb_task_has_cpu(p
)) {
2271 if (!KDB_TSK(cpu
)) {
2272 kdb_printf(" Error: no saved data for this cpu\n");
2274 if (KDB_TSK(cpu
) != p
)
2275 kdb_printf(" Error: does not match running "
2276 "process table (0x%p)\n", KDB_TSK(cpu
));
2281 static int kdb_ps(int argc
, const char **argv
)
2283 struct task_struct
*g
, *p
;
2284 unsigned long mask
, cpu
;
2287 kdb_ps_suppressed();
2288 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2289 (int)(2*sizeof(void *))+2, "Task Addr",
2290 (int)(2*sizeof(void *))+2, "Thread");
2291 mask
= kdb_task_state_string(argc
? argv
[1] : NULL
);
2292 /* Run the active tasks first */
2293 for_each_online_cpu(cpu
) {
2294 if (KDB_FLAG(CMD_INTERRUPT
))
2296 p
= kdb_curr_task(cpu
);
2297 if (kdb_task_state(p
, mask
))
2301 /* Now the real tasks */
2302 kdb_do_each_thread(g
, p
) {
2303 if (KDB_FLAG(CMD_INTERRUPT
))
2305 if (kdb_task_state(p
, mask
))
2307 } kdb_while_each_thread(g
, p
);
2313 * kdb_pid - This function implements the 'pid' command which switches
2314 * the currently active process.
2317 static int kdb_pid(int argc
, const char **argv
)
2319 struct task_struct
*p
;
2324 return KDB_ARGCOUNT
;
2327 if (strcmp(argv
[1], "R") == 0) {
2328 p
= KDB_TSK(kdb_initial_cpu
);
2330 diag
= kdbgetularg(argv
[1], &val
);
2334 p
= find_task_by_pid_ns((pid_t
)val
, &init_pid_ns
);
2336 kdb_printf("No task with pid=%d\n", (pid_t
)val
);
2340 kdb_set_current_task(p
);
2342 kdb_printf("KDB current process is %s(pid=%d)\n",
2343 kdb_current_task
->comm
,
2344 kdb_current_task
->pid
);
2349 static int kdb_kgdb(int argc
, const char **argv
)
2351 return KDB_CMD_KGDB
;
2355 * kdb_help - This function implements the 'help' and '?' commands.
2357 static int kdb_help(int argc
, const char **argv
)
2362 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2363 kdb_printf("-----------------------------"
2364 "-----------------------------\n");
2365 for_each_kdbcmd(kt
, i
) {
2367 if (KDB_FLAG(CMD_INTERRUPT
))
2371 if (strlen(kt
->cmd_usage
) > 20)
2373 kdb_printf("%-15.15s %-20s%s%s\n", kt
->cmd_name
,
2374 kt
->cmd_usage
, space
, kt
->cmd_help
);
2380 * kdb_kill - This function implements the 'kill' commands.
2382 static int kdb_kill(int argc
, const char **argv
)
2386 struct task_struct
*p
;
2387 struct siginfo info
;
2390 return KDB_ARGCOUNT
;
2392 sig
= simple_strtol(argv
[1], &endp
, 0);
2396 kdb_printf("Invalid signal parameter.<-signal>\n");
2401 pid
= simple_strtol(argv
[2], &endp
, 0);
2405 kdb_printf("Process ID must be large than 0.\n");
2409 /* Find the process. */
2410 p
= find_task_by_pid_ns(pid
, &init_pid_ns
);
2412 kdb_printf("The specified process isn't found.\n");
2415 p
= p
->group_leader
;
2416 info
.si_signo
= sig
;
2418 info
.si_code
= SI_USER
;
2419 info
.si_pid
= pid
; /* same capabilities as process being signalled */
2420 info
.si_uid
= 0; /* kdb has root authority */
2421 kdb_send_sig_info(p
, &info
);
2426 int tm_sec
; /* seconds */
2427 int tm_min
; /* minutes */
2428 int tm_hour
; /* hours */
2429 int tm_mday
; /* day of the month */
2430 int tm_mon
; /* month */
2431 int tm_year
; /* year */
2434 static void kdb_gmtime(struct timespec
*tv
, struct kdb_tm
*tm
)
2436 /* This will work from 1970-2099, 2100 is not a leap year */
2437 static int mon_day
[] = { 31, 29, 31, 30, 31, 30, 31,
2438 31, 30, 31, 30, 31 };
2439 memset(tm
, 0, sizeof(*tm
));
2440 tm
->tm_sec
= tv
->tv_sec
% (24 * 60 * 60);
2441 tm
->tm_mday
= tv
->tv_sec
/ (24 * 60 * 60) +
2442 (2 * 365 + 1); /* shift base from 1970 to 1968 */
2443 tm
->tm_min
= tm
->tm_sec
/ 60 % 60;
2444 tm
->tm_hour
= tm
->tm_sec
/ 60 / 60;
2445 tm
->tm_sec
= tm
->tm_sec
% 60;
2446 tm
->tm_year
= 68 + 4*(tm
->tm_mday
/ (4*365+1));
2447 tm
->tm_mday
%= (4*365+1);
2449 while (tm
->tm_mday
>= mon_day
[tm
->tm_mon
]) {
2450 tm
->tm_mday
-= mon_day
[tm
->tm_mon
];
2451 if (++tm
->tm_mon
== 12) {
2461 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2462 * I cannot call that code directly from kdb, it has an unconditional
2463 * cli()/sti() and calls routines that take locks which can stop the debugger.
2465 static void kdb_sysinfo(struct sysinfo
*val
)
2467 struct timespec uptime
;
2468 ktime_get_ts(&uptime
);
2469 memset(val
, 0, sizeof(*val
));
2470 val
->uptime
= uptime
.tv_sec
;
2471 val
->loads
[0] = avenrun
[0];
2472 val
->loads
[1] = avenrun
[1];
2473 val
->loads
[2] = avenrun
[2];
2474 val
->procs
= nr_threads
-1;
2481 * kdb_summary - This function implements the 'summary' command.
2483 static int kdb_summary(int argc
, const char **argv
)
2485 struct timespec now
;
2490 return KDB_ARGCOUNT
;
2492 kdb_printf("sysname %s\n", init_uts_ns
.name
.sysname
);
2493 kdb_printf("release %s\n", init_uts_ns
.name
.release
);
2494 kdb_printf("version %s\n", init_uts_ns
.name
.version
);
2495 kdb_printf("machine %s\n", init_uts_ns
.name
.machine
);
2496 kdb_printf("nodename %s\n", init_uts_ns
.name
.nodename
);
2497 kdb_printf("domainname %s\n", init_uts_ns
.name
.domainname
);
2498 kdb_printf("ccversion %s\n", __stringify(CCVERSION
));
2500 now
= __current_kernel_time();
2501 kdb_gmtime(&now
, &tm
);
2502 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2503 "tz_minuteswest %d\n",
2504 1900+tm
.tm_year
, tm
.tm_mon
+1, tm
.tm_mday
,
2505 tm
.tm_hour
, tm
.tm_min
, tm
.tm_sec
,
2506 sys_tz
.tz_minuteswest
);
2509 kdb_printf("uptime ");
2510 if (val
.uptime
> (24*60*60)) {
2511 int days
= val
.uptime
/ (24*60*60);
2512 val
.uptime
%= (24*60*60);
2513 kdb_printf("%d day%s ", days
, days
== 1 ? "" : "s");
2515 kdb_printf("%02ld:%02ld\n", val
.uptime
/(60*60), (val
.uptime
/60)%60);
2517 /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */
2519 #define LOAD_INT(x) ((x) >> FSHIFT)
2520 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2521 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2522 LOAD_INT(val
.loads
[0]), LOAD_FRAC(val
.loads
[0]),
2523 LOAD_INT(val
.loads
[1]), LOAD_FRAC(val
.loads
[1]),
2524 LOAD_INT(val
.loads
[2]), LOAD_FRAC(val
.loads
[2]));
2527 /* Display in kilobytes */
2528 #define K(x) ((x) << (PAGE_SHIFT - 10))
2529 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2530 "Buffers: %8lu kB\n",
2531 val
.totalram
, val
.freeram
, val
.bufferram
);
2536 * kdb_per_cpu - This function implements the 'per_cpu' command.
2538 static int kdb_per_cpu(int argc
, const char **argv
)
2541 int cpu
, diag
, nextarg
= 1;
2542 unsigned long addr
, symaddr
, val
, bytesperword
= 0, whichcpu
= ~0UL;
2544 if (argc
< 1 || argc
> 3)
2545 return KDB_ARGCOUNT
;
2547 diag
= kdbgetaddrarg(argc
, argv
, &nextarg
, &symaddr
, NULL
, NULL
);
2552 diag
= kdbgetularg(argv
[2], &bytesperword
);
2557 bytesperword
= KDB_WORD_SIZE
;
2558 else if (bytesperword
> KDB_WORD_SIZE
)
2559 return KDB_BADWIDTH
;
2560 sprintf(fmtstr
, "%%0%dlx ", (int)(2*bytesperword
));
2562 diag
= kdbgetularg(argv
[3], &whichcpu
);
2565 if (!cpu_online(whichcpu
)) {
2566 kdb_printf("cpu %ld is not online\n", whichcpu
);
2567 return KDB_BADCPUNUM
;
2571 /* Most architectures use __per_cpu_offset[cpu], some use
2572 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2574 #ifdef __per_cpu_offset
2575 #define KDB_PCU(cpu) __per_cpu_offset(cpu)
2578 #define KDB_PCU(cpu) __per_cpu_offset[cpu]
2580 #define KDB_PCU(cpu) 0
2583 for_each_online_cpu(cpu
) {
2584 if (KDB_FLAG(CMD_INTERRUPT
))
2587 if (whichcpu
!= ~0UL && whichcpu
!= cpu
)
2589 addr
= symaddr
+ KDB_PCU(cpu
);
2590 diag
= kdb_getword(&val
, addr
, bytesperword
);
2592 kdb_printf("%5d " kdb_bfd_vma_fmt0
" - unable to "
2593 "read, diag=%d\n", cpu
, addr
, diag
);
2596 kdb_printf("%5d ", cpu
);
2597 kdb_md_line(fmtstr
, addr
,
2598 bytesperword
== KDB_WORD_SIZE
,
2599 1, bytesperword
, 1, 1, 0);
2606 * display help for the use of cmd | grep pattern
2608 static int kdb_grep_help(int argc
, const char **argv
)
2610 kdb_printf("Usage of cmd args | grep pattern:\n");
2611 kdb_printf(" Any command's output may be filtered through an ");
2612 kdb_printf("emulated 'pipe'.\n");
2613 kdb_printf(" 'grep' is just a key word.\n");
2614 kdb_printf(" The pattern may include a very limited set of "
2615 "metacharacters:\n");
2616 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2617 kdb_printf(" And if there are spaces in the pattern, you may "
2619 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2620 " or \"^pat tern$\"\n");
2625 * kdb_register_flags - This function is used to register a kernel
2629 * func Function to execute the command
2630 * usage A simple usage string showing arguments
2631 * help A simple help string describing command
2632 * repeat Does the command auto repeat on enter?
2634 * zero for success, one if a duplicate command.
2636 #define kdb_command_extend 50 /* arbitrary */
2637 int kdb_register_flags(char *cmd
,
2642 kdb_cmdflags_t flags
)
2648 * Brute force method to determine duplicates
2650 for_each_kdbcmd(kp
, i
) {
2651 if (kp
->cmd_name
&& (strcmp(kp
->cmd_name
, cmd
) == 0)) {
2652 kdb_printf("Duplicate kdb command registered: "
2653 "%s, func %p help %s\n", cmd
, func
, help
);
2659 * Insert command into first available location in table
2661 for_each_kdbcmd(kp
, i
) {
2662 if (kp
->cmd_name
== NULL
)
2666 if (i
>= kdb_max_commands
) {
2667 kdbtab_t
*new = kmalloc((kdb_max_commands
- KDB_BASE_CMD_MAX
+
2668 kdb_command_extend
) * sizeof(*new), GFP_KDB
);
2670 kdb_printf("Could not allocate new kdb_command "
2675 memcpy(new, kdb_commands
,
2676 (kdb_max_commands
- KDB_BASE_CMD_MAX
) * sizeof(*new));
2677 kfree(kdb_commands
);
2679 memset(new + kdb_max_commands
- KDB_BASE_CMD_MAX
, 0,
2680 kdb_command_extend
* sizeof(*new));
2682 kp
= kdb_commands
+ kdb_max_commands
- KDB_BASE_CMD_MAX
;
2683 kdb_max_commands
+= kdb_command_extend
;
2687 kp
->cmd_func
= func
;
2688 kp
->cmd_usage
= usage
;
2689 kp
->cmd_help
= help
;
2690 kp
->cmd_minlen
= minlen
;
2691 kp
->cmd_flags
= flags
;
2695 EXPORT_SYMBOL_GPL(kdb_register_flags
);
2699 * kdb_register - Compatibility register function for commands that do
2700 * not need to specify a repeat state. Equivalent to
2701 * kdb_register_flags with flags set to 0.
2704 * func Function to execute the command
2705 * usage A simple usage string showing arguments
2706 * help A simple help string describing command
2708 * zero for success, one if a duplicate command.
2710 int kdb_register(char *cmd
,
2716 return kdb_register_flags(cmd
, func
, usage
, help
, minlen
, 0);
2718 EXPORT_SYMBOL_GPL(kdb_register
);
2721 * kdb_unregister - This function is used to unregister a kernel
2722 * debugger command. It is generally called when a module which
2723 * implements kdb commands is unloaded.
2727 * zero for success, one command not registered.
2729 int kdb_unregister(char *cmd
)
2737 for_each_kdbcmd(kp
, i
) {
2738 if (kp
->cmd_name
&& (strcmp(kp
->cmd_name
, cmd
) == 0)) {
2739 kp
->cmd_name
= NULL
;
2744 /* Couldn't find it. */
2747 EXPORT_SYMBOL_GPL(kdb_unregister
);
2749 /* Initialize the kdb command table. */
2750 static void __init
kdb_inittab(void)
2755 for_each_kdbcmd(kp
, i
)
2756 kp
->cmd_name
= NULL
;
2758 kdb_register_flags("md", kdb_md
, "<vaddr>",
2759 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2760 KDB_REPEAT_NO_ARGS
);
2761 kdb_register_flags("mdr", kdb_md
, "<vaddr> <bytes>",
2762 "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS
);
2763 kdb_register_flags("mdp", kdb_md
, "<paddr> <bytes>",
2764 "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS
);
2765 kdb_register_flags("mds", kdb_md
, "<vaddr>",
2766 "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS
);
2767 kdb_register_flags("mm", kdb_mm
, "<vaddr> <contents>",
2768 "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS
);
2769 kdb_register_flags("go", kdb_go
, "[<vaddr>]",
2770 "Continue Execution", 1, 0);
2771 kdb_register_flags("rd", kdb_rd
, "",
2772 "Display Registers", 0, 0);
2773 kdb_register_flags("rm", kdb_rm
, "<reg> <contents>",
2774 "Modify Registers", 0, 0);
2775 kdb_register_flags("ef", kdb_ef
, "<vaddr>",
2776 "Display exception frame", 0, 0);
2777 kdb_register_flags("bt", kdb_bt
, "[<vaddr>]",
2778 "Stack traceback", 1, 0);
2779 kdb_register_flags("btp", kdb_bt
, "<pid>",
2780 "Display stack for process <pid>", 0, 0);
2781 kdb_register_flags("bta", kdb_bt
, "[D|R|S|T|C|Z|E|U|I|M|A]",
2782 "Backtrace all processes matching state flag", 0, 0);
2783 kdb_register_flags("btc", kdb_bt
, "",
2784 "Backtrace current process on each cpu", 0, 0);
2785 kdb_register_flags("btt", kdb_bt
, "<vaddr>",
2786 "Backtrace process given its struct task address", 0,
2788 kdb_register_flags("env", kdb_env
, "",
2789 "Show environment variables", 0, 0);
2790 kdb_register_flags("set", kdb_set
, "",
2791 "Set environment variables", 0, 0);
2792 kdb_register_flags("help", kdb_help
, "",
2793 "Display Help Message", 1, 0);
2794 kdb_register_flags("?", kdb_help
, "",
2795 "Display Help Message", 0, 0);
2796 kdb_register_flags("cpu", kdb_cpu
, "<cpunum>",
2797 "Switch to new cpu", 0, 0);
2798 kdb_register_flags("kgdb", kdb_kgdb
, "",
2799 "Enter kgdb mode", 0, 0);
2800 kdb_register_flags("ps", kdb_ps
, "[<flags>|A]",
2801 "Display active task list", 0, 0);
2802 kdb_register_flags("pid", kdb_pid
, "<pidnum>",
2803 "Switch to another task", 0, 0);
2804 kdb_register_flags("reboot", kdb_reboot
, "",
2805 "Reboot the machine immediately", 0, 0);
2806 #if defined(CONFIG_MODULES)
2807 kdb_register_flags("lsmod", kdb_lsmod
, "",
2808 "List loaded kernel modules", 0, 0);
2810 #if defined(CONFIG_MAGIC_SYSRQ)
2811 kdb_register_flags("sr", kdb_sr
, "<key>",
2812 "Magic SysRq key", 0, 0);
2814 #if defined(CONFIG_PRINTK)
2815 kdb_register_flags("dmesg", kdb_dmesg
, "[lines]",
2816 "Display syslog buffer", 0, 0);
2818 if (arch_kgdb_ops
.enable_nmi
) {
2819 kdb_register_flags("disable_nmi", kdb_disable_nmi
, "",
2820 "Disable NMI entry to KDB", 0, 0);
2822 kdb_register_flags("defcmd", kdb_defcmd
, "name \"usage\" \"help\"",
2823 "Define a set of commands, down to endefcmd", 0, 0);
2824 kdb_register_flags("kill", kdb_kill
, "<-signal> <pid>",
2825 "Send a signal to a process", 0, 0);
2826 kdb_register_flags("summary", kdb_summary
, "",
2827 "Summarize the system", 4, 0);
2828 kdb_register_flags("per_cpu", kdb_per_cpu
, "<sym> [<bytes>] [<cpu>]",
2829 "Display per_cpu variables", 3, 0);
2830 kdb_register_flags("grephelp", kdb_grep_help
, "",
2831 "Display help on | grep", 0, 0);
2834 /* Execute any commands defined in kdb_cmds. */
2835 static void __init
kdb_cmd_init(void)
2838 for (i
= 0; kdb_cmds
[i
]; ++i
) {
2839 diag
= kdb_parse(kdb_cmds
[i
]);
2841 kdb_printf("kdb command %s failed, kdb diag %d\n",
2844 if (defcmd_in_progress
) {
2845 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2846 kdb_parse("endefcmd");
2850 /* Initialize kdb_printf, breakpoint tables and kdb state */
2851 void __init
kdb_init(int lvl
)
2853 static int kdb_init_lvl
= KDB_NOT_INITIALIZED
;
2856 if (kdb_init_lvl
== KDB_INIT_FULL
|| lvl
<= kdb_init_lvl
)
2858 for (i
= kdb_init_lvl
; i
< lvl
; i
++) {
2860 case KDB_NOT_INITIALIZED
:
2861 kdb_inittab(); /* Initialize Command Table */
2862 kdb_initbptab(); /* Initialize Breakpoints */
2864 case KDB_INIT_EARLY
:
2865 kdb_cmd_init(); /* Build kdb_cmds tables */