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/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>
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"
50 #undef MODULE_PARAM_PREFIX
51 #define MODULE_PARAM_PREFIX "kdb."
53 static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
54 module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
56 char kdb_grep_string[KDB_GREP_STRLEN];
57 int kdb_grepping_flag;
58 EXPORT_SYMBOL(kdb_grepping_flag);
60 int kdb_grep_trailing;
63 * Kernel debugger state flags
65 unsigned int kdb_flags;
68 * kdb_lock protects updates to kdb_initial_cpu. Used to
69 * single thread processors through the kernel debugger.
71 int kdb_initial_cpu = -1; /* cpu number that owns kdb */
73 int kdb_state; /* General KDB state */
75 struct task_struct *kdb_current_task;
76 struct pt_regs *kdb_current_regs;
78 const char *kdb_diemsg;
79 static int kdb_go_count;
80 #ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
81 static unsigned int kdb_continue_catastrophic =
82 CONFIG_KDB_CONTINUE_CATASTROPHIC;
84 static unsigned int kdb_continue_catastrophic;
87 /* kdb_commands describes the available commands. */
88 static kdbtab_t *kdb_commands;
89 #define KDB_BASE_CMD_MAX 50
90 static int kdb_max_commands = KDB_BASE_CMD_MAX;
91 static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
92 #define for_each_kdbcmd(cmd, num) \
93 for ((cmd) = kdb_base_commands, (num) = 0; \
94 num < kdb_max_commands; \
95 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
97 typedef struct _kdbmsg {
98 int km_diag; /* kdb diagnostic */
99 char *km_msg; /* Corresponding message text */
102 #define KDBMSG(msgnum, text) \
103 { KDB_##msgnum, text }
105 static kdbmsg_t kdbmsgs[] = {
106 KDBMSG(NOTFOUND, "Command Not Found"),
107 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
108 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
109 "8 is only allowed on 64 bit systems"),
110 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
111 KDBMSG(NOTENV, "Cannot find environment variable"),
112 KDBMSG(NOENVVALUE, "Environment variable should have value"),
113 KDBMSG(NOTIMP, "Command not implemented"),
114 KDBMSG(ENVFULL, "Environment full"),
115 KDBMSG(ENVBUFFULL, "Environment buffer full"),
116 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
117 #ifdef CONFIG_CPU_XSCALE
118 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
120 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
122 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
123 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
124 KDBMSG(BADMODE, "Invalid IDMODE"),
125 KDBMSG(BADINT, "Illegal numeric value"),
126 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
127 KDBMSG(BADREG, "Invalid register name"),
128 KDBMSG(BADCPUNUM, "Invalid cpu number"),
129 KDBMSG(BADLENGTH, "Invalid length field"),
130 KDBMSG(NOBP, "No Breakpoint exists"),
131 KDBMSG(BADADDR, "Invalid address"),
132 KDBMSG(NOPERM, "Permission denied"),
136 static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
140 * Initial environment. This is all kept static and local to
141 * this file. We don't want to rely on the memory allocation
142 * mechanisms in the kernel, so we use a very limited allocate-only
143 * heap for new and altered environment variables. The entire
144 * environment is limited to a fixed number of entries (add more
145 * to __env[] if required) and a fixed amount of heap (add more to
146 * KDB_ENVBUFSIZE if required).
149 static char *__env[] = {
150 #if defined(CONFIG_SMP)
157 "MDCOUNT=8", /* lines of md output */
187 static const int __nenv = ARRAY_SIZE(__env);
189 struct task_struct *kdb_curr_task(int cpu)
191 struct task_struct *p = curr_task(cpu);
193 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
200 * Check whether the flags of the current command and the permissions
201 * of the kdb console has allow a command to be run.
203 static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
206 /* permissions comes from userspace so needs massaging slightly */
207 permissions &= KDB_ENABLE_MASK;
208 permissions |= KDB_ENABLE_ALWAYS_SAFE;
210 /* some commands change group when launched with no arguments */
212 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
214 flags |= KDB_ENABLE_ALL;
216 return permissions & flags;
220 * kdbgetenv - This function will return the character string value of
221 * an environment variable.
223 * match A character string representing an environment variable.
225 * NULL No environment variable matches 'match'
226 * char* Pointer to string value of environment variable.
228 char *kdbgetenv(const char *match)
231 int matchlen = strlen(match);
234 for (i = 0; i < __nenv; i++) {
240 if ((strncmp(match, e, matchlen) == 0)
241 && ((e[matchlen] == '\0')
242 || (e[matchlen] == '='))) {
243 char *cp = strchr(e, '=');
244 return cp ? ++cp : "";
251 * kdballocenv - This function is used to allocate bytes for
252 * environment entries.
254 * match A character string representing a numeric value
256 * *value the unsigned long representation of the env variable 'match'
258 * Zero on success, a kdb diagnostic on failure.
260 * We use a static environment buffer (envbuffer) to hold the values
261 * of dynamically generated environment variables (see kdb_set). Buffer
262 * space once allocated is never free'd, so over time, the amount of space
263 * (currently 512 bytes) will be exhausted if env variables are changed
266 static char *kdballocenv(size_t bytes)
268 #define KDB_ENVBUFSIZE 512
269 static char envbuffer[KDB_ENVBUFSIZE];
270 static int envbufsize;
273 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
274 ep = &envbuffer[envbufsize];
281 * kdbgetulenv - This function will return the value of an unsigned
282 * long-valued environment variable.
284 * match A character string representing a numeric value
286 * *value the unsigned long represntation of the env variable 'match'
288 * Zero on success, a kdb diagnostic on failure.
290 static int kdbgetulenv(const char *match, unsigned long *value)
294 ep = kdbgetenv(match);
298 return KDB_NOENVVALUE;
300 *value = simple_strtoul(ep, NULL, 0);
306 * kdbgetintenv - This function will return the value of an
307 * integer-valued environment variable.
309 * match A character string representing an integer-valued env variable
311 * *value the integer representation of the environment variable 'match'
313 * Zero on success, a kdb diagnostic on failure.
315 int kdbgetintenv(const char *match, int *value)
320 diag = kdbgetulenv(match, &val);
327 * kdbgetularg - This function will convert a numeric string into an
328 * unsigned long value.
330 * arg A character string representing a numeric value
332 * *value the unsigned long represntation of arg.
334 * Zero on success, a kdb diagnostic on failure.
336 int kdbgetularg(const char *arg, unsigned long *value)
341 val = simple_strtoul(arg, &endp, 0);
345 * Also try base 16, for us folks too lazy to type the
348 val = simple_strtoul(arg, &endp, 16);
358 int kdbgetu64arg(const char *arg, u64 *value)
363 val = simple_strtoull(arg, &endp, 0);
367 val = simple_strtoull(arg, &endp, 16);
378 * kdb_set - This function implements the 'set' command. Alter an
379 * existing environment variable or create a new one.
381 int kdb_set(int argc, const char **argv)
385 size_t varlen, vallen;
388 * we can be invoked two ways:
389 * set var=value argv[1]="var", argv[2]="value"
390 * set var = value argv[1]="var", argv[2]="=", argv[3]="value"
391 * - if the latter, shift 'em down.
402 * Censor sensitive variables
404 if (strcmp(argv[1], "PROMPT") == 0 &&
405 !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
409 * Check for internal variables
411 if (strcmp(argv[1], "KDBDEBUG") == 0) {
412 unsigned int debugflags;
415 debugflags = simple_strtoul(argv[2], &cp, 0);
416 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
417 kdb_printf("kdb: illegal debug flags '%s'\n",
421 kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK))
422 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
428 * Tokenizer squashed the '=' sign. argv[1] is variable
429 * name, argv[2] = value.
431 varlen = strlen(argv[1]);
432 vallen = strlen(argv[2]);
433 ep = kdballocenv(varlen + vallen + 2);
435 return KDB_ENVBUFFULL;
437 sprintf(ep, "%s=%s", argv[1], argv[2]);
439 ep[varlen+vallen+1] = '\0';
441 for (i = 0; i < __nenv; i++) {
443 && ((strncmp(__env[i], argv[1], varlen) == 0)
444 && ((__env[i][varlen] == '\0')
445 || (__env[i][varlen] == '=')))) {
452 * Wasn't existing variable. Fit into slot.
454 for (i = 0; i < __nenv-1; i++) {
455 if (__env[i] == (char *)0) {
464 static int kdb_check_regs(void)
466 if (!kdb_current_regs) {
467 kdb_printf("No current kdb registers."
468 " You may need to select another task\n");
475 * kdbgetaddrarg - This function is responsible for parsing an
476 * address-expression and returning the value of the expression,
477 * symbol name, and offset to the caller.
479 * The argument may consist of a numeric value (decimal or
480 * hexidecimal), a symbol name, a register name (preceded by the
481 * percent sign), an environment variable with a numeric value
482 * (preceded by a dollar sign) or a simple arithmetic expression
483 * consisting of a symbol name, +/-, and a numeric constant value
486 * argc - count of arguments in argv
487 * argv - argument vector
488 * *nextarg - index to next unparsed argument in argv[]
489 * regs - Register state at time of KDB entry
491 * *value - receives the value of the address-expression
492 * *offset - receives the offset specified, if any
493 * *name - receives the symbol name, if any
494 * *nextarg - index to next unparsed argument in argv[]
496 * zero is returned on success, a kdb diagnostic code is
499 int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
500 unsigned long *value, long *offset,
504 unsigned long off = 0;
514 * If the enable flags prohibit both arbitrary memory access
515 * and flow control then there are no reasonable grounds to
516 * provide symbol lookup.
518 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
519 kdb_cmd_enabled, false))
523 * Process arguments which follow the following syntax:
525 * symbol | numeric-address [+/- numeric-offset]
527 * $environment-variable
533 symname = (char *)argv[*nextarg];
536 * If there is no whitespace between the symbol
537 * or address and the '+' or '-' symbols, we
538 * remember the character and replace it with a
539 * null so the symbol/value can be properly parsed
541 cp = strpbrk(symname, "+-");
547 if (symname[0] == '$') {
548 diag = kdbgetulenv(&symname[1], &addr);
551 } else if (symname[0] == '%') {
552 diag = kdb_check_regs();
555 /* Implement register values with % at a later time as it is
560 found = kdbgetsymval(symname, &symtab);
562 addr = symtab.sym_start;
564 diag = kdbgetularg(argv[*nextarg], &addr);
571 found = kdbnearsym(addr, &symtab);
579 if (offset && name && *name)
580 *offset = addr - symtab.sym_start;
582 if ((*nextarg > argc)
587 * check for +/- and offset
590 if (symbol == '\0') {
591 if ((argv[*nextarg][0] != '+')
592 && (argv[*nextarg][0] != '-')) {
594 * Not our argument. Return.
598 positive = (argv[*nextarg][0] == '+');
602 positive = (symbol == '+');
605 * Now there must be an offset!
607 if ((*nextarg > argc)
608 && (symbol == '\0')) {
609 return KDB_INVADDRFMT;
613 cp = (char *)argv[*nextarg];
617 diag = kdbgetularg(cp, &off);
633 static void kdb_cmderror(int diag)
638 kdb_printf("no error detected (diagnostic is %d)\n", diag);
642 for (i = 0; i < __nkdb_err; i++) {
643 if (kdbmsgs[i].km_diag == diag) {
644 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
649 kdb_printf("Unknown diag %d\n", -diag);
653 * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd'
654 * command which defines one command as a set of other commands,
655 * terminated by endefcmd. kdb_defcmd processes the initial
656 * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for
657 * the following commands until 'endefcmd'.
659 * argc argument count
660 * argv argument vector
662 * zero for success, a kdb diagnostic if error
672 static struct defcmd_set *defcmd_set;
673 static int defcmd_set_count;
674 static bool defcmd_in_progress;
676 /* Forward references */
677 static int kdb_exec_defcmd(int argc, const char **argv);
679 static int kdb_defcmd2(const char *cmdstr, const char *argv0)
681 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
682 char **save_command = s->command;
683 if (strcmp(argv0, "endefcmd") == 0) {
684 defcmd_in_progress = false;
688 /* macros are always safe because when executed each
689 * internal command re-enters kdb_parse() and is
690 * safety checked individually.
692 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
694 KDB_ENABLE_ALWAYS_SAFE);
699 s->command = kcalloc(s->count + 1, sizeof(*(s->command)), GFP_KDB);
701 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
706 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
707 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
712 static int kdb_defcmd(int argc, const char **argv)
714 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
715 if (defcmd_in_progress) {
716 kdb_printf("kdb: nested defcmd detected, assuming missing "
718 kdb_defcmd2("endefcmd", "endefcmd");
722 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
723 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
725 for (i = 0; i < s->count; ++i)
726 kdb_printf("%s", s->command[i]);
727 kdb_printf("endefcmd\n");
733 if (in_dbg_master()) {
734 kdb_printf("Command only available during kdb_init()\n");
737 defcmd_set = kmalloc_array(defcmd_set_count + 1, sizeof(*defcmd_set),
741 memcpy(defcmd_set, save_defcmd_set,
742 defcmd_set_count * sizeof(*defcmd_set));
743 s = defcmd_set + defcmd_set_count;
744 memset(s, 0, sizeof(*s));
746 s->name = kdb_strdup(argv[1], GFP_KDB);
749 s->usage = kdb_strdup(argv[2], GFP_KDB);
752 s->help = kdb_strdup(argv[3], GFP_KDB);
755 if (s->usage[0] == '"') {
756 strcpy(s->usage, argv[2]+1);
757 s->usage[strlen(s->usage)-1] = '\0';
759 if (s->help[0] == '"') {
760 strcpy(s->help, argv[3]+1);
761 s->help[strlen(s->help)-1] = '\0';
764 defcmd_in_progress = true;
765 kfree(save_defcmd_set);
774 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
775 defcmd_set = save_defcmd_set;
780 * kdb_exec_defcmd - Execute the set of commands associated with this
783 * argc argument count
784 * argv argument vector
786 * zero for success, a kdb diagnostic if error
788 static int kdb_exec_defcmd(int argc, const char **argv)
791 struct defcmd_set *s;
794 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
795 if (strcmp(s->name, argv[0]) == 0)
798 if (i == defcmd_set_count) {
799 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
803 for (i = 0; i < s->count; ++i) {
804 /* Recursive use of kdb_parse, do not use argv after
807 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
808 ret = kdb_parse(s->command[i]);
815 /* Command history */
816 #define KDB_CMD_HISTORY_COUNT 32
817 #define CMD_BUFLEN 200 /* kdb_printf: max printline
819 static unsigned int cmd_head, cmd_tail;
820 static unsigned int cmdptr;
821 static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
822 static char cmd_cur[CMD_BUFLEN];
825 * The "str" argument may point to something like | grep xyz
827 static void parse_grep(const char *str)
830 char *cp = (char *)str, *cp2;
832 /* sanity check: we should have been called with the \ first */
838 if (!str_has_prefix(cp, "grep ")) {
839 kdb_printf("invalid 'pipe', see grephelp\n");
845 cp2 = strchr(cp, '\n');
847 *cp2 = '\0'; /* remove the trailing newline */
850 kdb_printf("invalid 'pipe', see grephelp\n");
853 /* now cp points to a nonzero length search string */
855 /* allow it be "x y z" by removing the "'s - there must
858 cp2 = strchr(cp, '"');
860 kdb_printf("invalid quoted string, see grephelp\n");
863 *cp2 = '\0'; /* end the string where the 2nd " was */
865 kdb_grep_leading = 0;
867 kdb_grep_leading = 1;
871 kdb_grep_trailing = 0;
872 if (*(cp+len-1) == '$') {
873 kdb_grep_trailing = 1;
879 if (len >= KDB_GREP_STRLEN) {
880 kdb_printf("search string too long\n");
883 strcpy(kdb_grep_string, cp);
889 * kdb_parse - Parse the command line, search the command table for a
890 * matching command and invoke the command function. This
891 * function may be called recursively, if it is, the second call
892 * will overwrite argv and cbuf. It is the caller's
893 * responsibility to save their argv if they recursively call
896 * cmdstr The input command line to be parsed.
897 * regs The registers at the time kdb was entered.
899 * Zero for success, a kdb diagnostic if failure.
901 * Limited to 20 tokens.
903 * Real rudimentary tokenization. Basically only whitespace
904 * is considered a token delimeter (but special consideration
905 * is taken of the '=' sign as used by the 'set' command).
907 * The algorithm used to tokenize the input string relies on
908 * there being at least one whitespace (or otherwise useless)
909 * character between tokens as the character immediately following
910 * the token is altered in-place to a null-byte to terminate the
916 int kdb_parse(const char *cmdstr)
918 static char *argv[MAXARGC];
920 static char cbuf[CMD_BUFLEN+2];
924 int i, escaped, ignore_errors = 0, check_grep = 0;
927 * First tokenize the command string.
931 if (KDB_FLAG(CMD_INTERRUPT)) {
932 /* Previous command was interrupted, newline must not
933 * repeat the command */
934 KDB_FLAG_CLEAR(CMD_INTERRUPT);
935 KDB_STATE_SET(PAGER);
936 argc = 0; /* no repeat */
939 if (*cp != '\n' && *cp != '\0') {
943 /* skip whitespace */
946 if ((*cp == '\0') || (*cp == '\n') ||
947 (*cp == '#' && !defcmd_in_progress))
949 /* special case: check for | grep pattern */
954 if (cpp >= cbuf + CMD_BUFLEN) {
955 kdb_printf("kdb_parse: command buffer "
956 "overflow, command ignored\n%s\n",
960 if (argc >= MAXARGC - 1) {
961 kdb_printf("kdb_parse: too many arguments, "
962 "command ignored\n%s\n", cmdstr);
968 /* Copy to next unquoted and unescaped
969 * whitespace or '=' */
970 while (*cp && *cp != '\n' &&
971 (escaped || quoted || !isspace(*cp))) {
972 if (cpp >= cbuf + CMD_BUFLEN)
986 else if (*cp == '\'' || *cp == '"')
989 if (*cpp == '=' && !quoted)
993 *cpp++ = '\0'; /* Squash a ws or '=' character */
1000 if (defcmd_in_progress) {
1001 int result = kdb_defcmd2(cmdstr, argv[0]);
1002 if (!defcmd_in_progress) {
1003 argc = 0; /* avoid repeat on endefcmd */
1008 if (argv[0][0] == '-' && argv[0][1] &&
1009 (argv[0][1] < '0' || argv[0][1] > '9')) {
1014 for_each_kdbcmd(tp, i) {
1017 * If this command is allowed to be abbreviated,
1018 * check to see if this is it.
1022 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1023 if (strncmp(argv[0],
1025 tp->cmd_minlen) == 0) {
1030 if (strcmp(argv[0], tp->cmd_name) == 0)
1036 * If we don't find a command by this name, see if the first
1037 * few characters of this match any of the known commands.
1038 * e.g., md1c20 should match md.
1040 if (i == kdb_max_commands) {
1041 for_each_kdbcmd(tp, i) {
1043 if (strncmp(argv[0],
1045 strlen(tp->cmd_name)) == 0) {
1052 if (i < kdb_max_commands) {
1055 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1059 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1060 if (result && ignore_errors && result > KDB_CMD_GO)
1062 KDB_STATE_CLEAR(CMD);
1064 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1067 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1069 *(argv[argc]) = '\0';
1074 * If the input with which we were presented does not
1075 * map to an existing command, attempt to parse it as an
1076 * address argument and display the result. Useful for
1077 * obtaining the address of a variable, or the nearest symbol
1078 * to an address contained in a register.
1081 unsigned long value;
1086 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1087 &value, &offset, &name)) {
1088 return KDB_NOTFOUND;
1091 kdb_printf("%s = ", argv[0]);
1092 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1099 static int handle_ctrl_cmd(char *cmd)
1104 /* initial situation */
1105 if (cmd_head == cmd_tail)
1109 if (cmdptr != cmd_tail)
1110 cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) %
1111 KDB_CMD_HISTORY_COUNT;
1112 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1115 if (cmdptr != cmd_head)
1116 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1117 strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1124 * kdb_reboot - This function implements the 'reboot' command. Reboot
1125 * the system immediately, or loop for ever on failure.
1127 static int kdb_reboot(int argc, const char **argv)
1129 emergency_restart();
1130 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1137 static void kdb_dumpregs(struct pt_regs *regs)
1139 int old_lvl = console_loglevel;
1140 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1145 console_loglevel = old_lvl;
1148 static void kdb_set_current_task(struct task_struct *p)
1150 kdb_current_task = p;
1152 if (kdb_task_has_cpu(p)) {
1153 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1156 kdb_current_regs = NULL;
1159 static void drop_newline(char *buf)
1161 size_t len = strlen(buf);
1165 if (*(buf + len - 1) == '\n')
1166 *(buf + len - 1) = '\0';
1170 * kdb_local - The main code for kdb. This routine is invoked on a
1171 * specific processor, it is not global. The main kdb() routine
1172 * ensures that only one processor at a time is in this routine.
1173 * This code is called with the real reason code on the first
1174 * entry to a kdb session, thereafter it is called with reason
1175 * SWITCH, even if the user goes back to the original cpu.
1177 * reason The reason KDB was invoked
1178 * error The hardware-defined error code
1179 * regs The exception frame at time of fault/breakpoint.
1180 * db_result Result code from the break or debug point.
1182 * 0 KDB was invoked for an event which it wasn't responsible
1183 * 1 KDB handled the event for which it was invoked.
1184 * KDB_CMD_GO User typed 'go'.
1185 * KDB_CMD_CPU User switched to another cpu.
1186 * KDB_CMD_SS Single step.
1188 static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1189 kdb_dbtrap_t db_result)
1193 struct task_struct *kdb_current =
1194 kdb_curr_task(raw_smp_processor_id());
1196 KDB_DEBUG_STATE("kdb_local 1", reason);
1198 if (reason == KDB_REASON_DEBUG) {
1199 /* special case below */
1201 kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
1202 kdb_current, kdb_current ? kdb_current->pid : 0);
1203 #if defined(CONFIG_SMP)
1204 kdb_printf("on processor %d ", raw_smp_processor_id());
1209 case KDB_REASON_DEBUG:
1212 * If re-entering kdb after a single step
1213 * command, don't print the message.
1215 switch (db_result) {
1217 kdb_printf("\nEntering kdb (0x%px, pid %d) ",
1218 kdb_current, kdb_current->pid);
1219 #if defined(CONFIG_SMP)
1220 kdb_printf("on processor %d ", raw_smp_processor_id());
1222 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1223 instruction_pointer(regs));
1228 KDB_DEBUG_STATE("kdb_local 4", reason);
1229 return 1; /* kdba_db_trap did the work */
1231 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1238 case KDB_REASON_ENTER:
1239 if (KDB_STATE(KEYBOARD))
1240 kdb_printf("due to Keyboard Entry\n");
1242 kdb_printf("due to KDB_ENTER()\n");
1244 case KDB_REASON_KEYBOARD:
1245 KDB_STATE_SET(KEYBOARD);
1246 kdb_printf("due to Keyboard Entry\n");
1248 case KDB_REASON_ENTER_SLAVE:
1249 /* drop through, slaves only get released via cpu switch */
1250 case KDB_REASON_SWITCH:
1251 kdb_printf("due to cpu switch\n");
1253 case KDB_REASON_OOPS:
1254 kdb_printf("Oops: %s\n", kdb_diemsg);
1255 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1256 instruction_pointer(regs));
1259 case KDB_REASON_SYSTEM_NMI:
1260 kdb_printf("due to System NonMaskable Interrupt\n");
1262 case KDB_REASON_NMI:
1263 kdb_printf("due to NonMaskable Interrupt @ "
1264 kdb_machreg_fmt "\n",
1265 instruction_pointer(regs));
1267 case KDB_REASON_SSTEP:
1268 case KDB_REASON_BREAK:
1269 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1270 reason == KDB_REASON_BREAK ?
1271 "Breakpoint" : "SS trap", instruction_pointer(regs));
1273 * Determine if this breakpoint is one that we
1274 * are interested in.
1276 if (db_result != KDB_DB_BPT) {
1277 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1279 KDB_DEBUG_STATE("kdb_local 6", reason);
1280 return 0; /* Not for us, dismiss it */
1283 case KDB_REASON_RECURSE:
1284 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1285 instruction_pointer(regs));
1288 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1289 KDB_DEBUG_STATE("kdb_local 8", reason);
1290 return 0; /* Not for us, dismiss it */
1295 * Initialize pager context.
1298 KDB_STATE_CLEAR(SUPPRESS);
1299 kdb_grepping_flag = 0;
1300 /* ensure the old search does not leak into '/' commands */
1301 kdb_grep_string[0] = '\0';
1305 *(cmd_hist[cmd_head]) = '\0';
1308 /* PROMPT can only be set if we have MEM_READ permission. */
1309 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1310 raw_smp_processor_id());
1311 if (defcmd_in_progress)
1312 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1315 * Fetch command from keyboard
1317 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1318 if (*cmdbuf != '\n') {
1320 if (cmdptr == cmd_head) {
1321 strscpy(cmd_hist[cmd_head], cmd_cur,
1323 *(cmd_hist[cmd_head] +
1324 strlen(cmd_hist[cmd_head])-1) = '\0';
1326 if (!handle_ctrl_cmd(cmdbuf))
1327 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1329 goto do_full_getstr;
1331 strscpy(cmd_hist[cmd_head], cmd_cur,
1335 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1336 if (cmd_head == cmd_tail)
1337 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1341 diag = kdb_parse(cmdbuf);
1342 if (diag == KDB_NOTFOUND) {
1343 drop_newline(cmdbuf);
1344 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1347 if (diag == KDB_CMD_GO
1348 || diag == KDB_CMD_CPU
1349 || diag == KDB_CMD_SS
1350 || diag == KDB_CMD_KGDB)
1356 KDB_DEBUG_STATE("kdb_local 9", diag);
1362 * kdb_print_state - Print the state data for the current processor
1365 * text Identifies the debug point
1366 * value Any integer value to be printed, e.g. reason code.
1368 void kdb_print_state(const char *text, int value)
1370 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1371 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1376 * kdb_main_loop - After initial setup and assignment of the
1377 * controlling cpu, all cpus are in this loop. One cpu is in
1378 * control and will issue the kdb prompt, the others will spin
1379 * until 'go' or cpu switch.
1381 * To get a consistent view of the kernel stacks for all
1382 * processes, this routine is invoked from the main kdb code via
1383 * an architecture specific routine. kdba_main_loop is
1384 * responsible for making the kernel stacks consistent for all
1385 * processes, there should be no difference between a blocked
1386 * process and a running process as far as kdb is concerned.
1388 * reason The reason KDB was invoked
1389 * error The hardware-defined error code
1390 * reason2 kdb's current reason code.
1391 * Initially error but can change
1392 * according to kdb state.
1393 * db_result Result code from break or debug point.
1394 * regs The exception frame at time of fault/breakpoint.
1395 * should always be valid.
1397 * 0 KDB was invoked for an event which it wasn't responsible
1398 * 1 KDB handled the event for which it was invoked.
1400 int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1401 kdb_dbtrap_t db_result, struct pt_regs *regs)
1404 /* Stay in kdb() until 'go', 'ss[b]' or an error */
1407 * All processors except the one that is in control
1410 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1411 while (KDB_STATE(HOLD_CPU)) {
1412 /* state KDB is turned off by kdb_cpu to see if the
1413 * other cpus are still live, each cpu in this loop
1416 if (!KDB_STATE(KDB))
1420 KDB_STATE_CLEAR(SUPPRESS);
1421 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1422 if (KDB_STATE(LEAVING))
1423 break; /* Another cpu said 'go' */
1424 /* Still using kdb, this processor is in control */
1425 result = kdb_local(reason2, error, regs, db_result);
1426 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1428 if (result == KDB_CMD_CPU)
1431 if (result == KDB_CMD_SS) {
1432 KDB_STATE_SET(DOING_SS);
1436 if (result == KDB_CMD_KGDB) {
1437 if (!KDB_STATE(DOING_KGDB))
1438 kdb_printf("Entering please attach debugger "
1439 "or use $D#44+ or $3#33\n");
1442 if (result && result != 1 && result != KDB_CMD_GO)
1443 kdb_printf("\nUnexpected kdb_local return code %d\n",
1445 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1448 if (KDB_STATE(DOING_SS))
1449 KDB_STATE_CLEAR(SSBPT);
1451 /* Clean up any keyboard devices before leaving */
1452 kdb_kbd_cleanup_state();
1458 * kdb_mdr - This function implements the guts of the 'mdr', memory
1460 * mdr <addr arg>,<byte count>
1462 * addr Start address
1463 * count Number of bytes
1465 * Always 0. Any errors are detected and printed by kdb_getarea.
1467 static int kdb_mdr(unsigned long addr, unsigned int count)
1471 if (kdb_getarea(c, addr))
1473 kdb_printf("%02x", c);
1481 * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4',
1482 * 'md8' 'mdr' and 'mds' commands.
1484 * md|mds [<addr arg> [<line count> [<radix>]]]
1485 * mdWcN [<addr arg> [<line count> [<radix>]]]
1486 * where W = is the width (1, 2, 4 or 8) and N is the count.
1487 * for eg., md1c20 reads 20 bytes, 1 at a time.
1488 * mdr <addr arg>,<byte count>
1490 static void kdb_md_line(const char *fmtstr, unsigned long addr,
1491 int symbolic, int nosect, int bytesperword,
1492 int num, int repeat, int phys)
1494 /* print just one line of data */
1495 kdb_symtab_t symtab;
1502 memset(cbuf, '\0', sizeof(cbuf));
1504 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1506 kdb_printf(kdb_machreg_fmt0 " ", addr);
1508 for (i = 0; i < num && repeat--; i++) {
1510 if (kdb_getphysword(&word, addr, bytesperword))
1512 } else if (kdb_getword(&word, addr, bytesperword))
1514 kdb_printf(fmtstr, word);
1516 kdbnearsym(word, &symtab);
1518 memset(&symtab, 0, sizeof(symtab));
1519 if (symtab.sym_name) {
1520 kdb_symbol_print(word, &symtab, 0);
1523 kdb_printf(" %s %s "
1526 kdb_machreg_fmt, symtab.mod_name,
1527 symtab.sec_name, symtab.sec_start,
1528 symtab.sym_start, symtab.sym_end);
1530 addr += bytesperword;
1538 cp = wc.c + 8 - bytesperword;
1543 #define printable_char(c) \
1544 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1545 for (j = 0; j < bytesperword; j++)
1546 *c++ = printable_char(*cp++);
1547 addr += bytesperword;
1548 #undef printable_char
1551 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1555 static int kdb_md(int argc, const char **argv)
1557 static unsigned long last_addr;
1558 static int last_radix, last_bytesperword, last_repeat;
1559 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1561 char fmtchar, fmtstr[64];
1570 kdbgetintenv("MDCOUNT", &mdcount);
1571 kdbgetintenv("RADIX", &radix);
1572 kdbgetintenv("BYTESPERWORD", &bytesperword);
1574 /* Assume 'md <addr>' and start with environment values */
1575 repeat = mdcount * 16 / bytesperword;
1577 if (strcmp(argv[0], "mdr") == 0) {
1578 if (argc == 2 || (argc == 0 && last_addr != 0))
1581 return KDB_ARGCOUNT;
1582 } else if (isdigit(argv[0][2])) {
1583 bytesperword = (int)(argv[0][2] - '0');
1584 if (bytesperword == 0) {
1585 bytesperword = last_bytesperword;
1586 if (bytesperword == 0)
1589 last_bytesperword = bytesperword;
1590 repeat = mdcount * 16 / bytesperword;
1593 else if (argv[0][3] == 'c' && argv[0][4]) {
1595 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1596 mdcount = ((repeat * bytesperword) + 15) / 16;
1599 last_repeat = repeat;
1600 } else if (strcmp(argv[0], "md") == 0)
1602 else if (strcmp(argv[0], "mds") == 0)
1604 else if (strcmp(argv[0], "mdp") == 0) {
1608 return KDB_NOTFOUND;
1612 return KDB_ARGCOUNT;
1615 bytesperword = last_bytesperword;
1616 repeat = last_repeat;
1620 mdcount = ((repeat * bytesperword) + 15) / 16;
1625 int diag, nextarg = 1;
1626 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1630 if (argc > nextarg+2)
1631 return KDB_ARGCOUNT;
1633 if (argc >= nextarg) {
1634 diag = kdbgetularg(argv[nextarg], &val);
1636 mdcount = (int) val;
1640 repeat = mdcount * 16 / bytesperword;
1643 if (argc >= nextarg+1) {
1644 diag = kdbgetularg(argv[nextarg+1], &val);
1650 if (strcmp(argv[0], "mdr") == 0) {
1653 ret = kdb_mdr(addr, mdcount);
1654 last_addr += mdcount;
1655 last_repeat = mdcount;
1656 last_bytesperword = bytesperword; // to make REPEAT happy
1671 return KDB_BADRADIX;
1676 if (bytesperword > KDB_WORD_SIZE)
1677 return KDB_BADWIDTH;
1679 switch (bytesperword) {
1681 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1684 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1687 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1690 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1693 return KDB_BADWIDTH;
1696 last_repeat = repeat;
1697 last_bytesperword = bytesperword;
1699 if (strcmp(argv[0], "mds") == 0) {
1701 /* Do not save these changes as last_*, they are temporary mds
1704 bytesperword = KDB_WORD_SIZE;
1706 kdbgetintenv("NOSECT", &nosect);
1709 /* Round address down modulo BYTESPERWORD */
1711 addr &= ~(bytesperword-1);
1713 while (repeat > 0) {
1715 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1717 if (KDB_FLAG(CMD_INTERRUPT))
1719 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1721 if (kdb_getphysword(&word, a, bytesperword)
1724 } else if (kdb_getword(&word, a, bytesperword) || word)
1727 n = min(num, repeat);
1728 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1730 addr += bytesperword * n;
1732 z = (z + num - 1) / num;
1734 int s = num * (z-2);
1735 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1736 " zero suppressed\n",
1737 addr, addr + bytesperword * s - 1);
1738 addr += bytesperword * s;
1748 * kdb_mm - This function implements the 'mm' command.
1749 * mm address-expression new-value
1751 * mm works on machine words, mmW works on bytes.
1753 static int kdb_mm(int argc, const char **argv)
1758 unsigned long contents;
1762 if (argv[0][2] && !isdigit(argv[0][2]))
1763 return KDB_NOTFOUND;
1766 return KDB_ARGCOUNT;
1769 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1774 return KDB_ARGCOUNT;
1775 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1779 if (nextarg != argc + 1)
1780 return KDB_ARGCOUNT;
1782 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1783 diag = kdb_putword(addr, contents, width);
1787 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1793 * kdb_go - This function implements the 'go' command.
1794 * go [address-expression]
1796 static int kdb_go(int argc, const char **argv)
1803 if (raw_smp_processor_id() != kdb_initial_cpu) {
1804 kdb_printf("go must execute on the entry cpu, "
1805 "please use \"cpu %d\" and then execute go\n",
1807 return KDB_BADCPUNUM;
1811 diag = kdbgetaddrarg(argc, argv, &nextarg,
1812 &addr, &offset, NULL);
1816 return KDB_ARGCOUNT;
1820 if (KDB_FLAG(CATASTROPHIC)) {
1821 kdb_printf("Catastrophic error detected\n");
1822 kdb_printf("kdb_continue_catastrophic=%d, ",
1823 kdb_continue_catastrophic);
1824 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1825 kdb_printf("type go a second time if you really want "
1829 if (kdb_continue_catastrophic == 2) {
1830 kdb_printf("forcing reboot\n");
1831 kdb_reboot(0, NULL);
1833 kdb_printf("attempting to continue\n");
1839 * kdb_rd - This function implements the 'rd' command.
1841 static int kdb_rd(int argc, const char **argv)
1843 int len = kdb_check_regs();
1844 #if DBG_MAX_REG_NUM > 0
1856 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1857 rsize = dbg_reg_def[i].size * 2;
1860 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1865 len += kdb_printf(" ");
1866 switch(dbg_reg_def[i].size * 8) {
1868 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1871 len += kdb_printf("%s: %02x", rname, reg8);
1874 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1877 len += kdb_printf("%s: %04x", rname, reg16);
1880 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1883 len += kdb_printf("%s: %08x", rname, reg32);
1886 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1889 len += kdb_printf("%s: %016llx", rname, reg64);
1892 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1900 kdb_dumpregs(kdb_current_regs);
1906 * kdb_rm - This function implements the 'rm' (register modify) command.
1907 * rm register-name new-contents
1909 * Allows register modification with the same restrictions as gdb
1911 static int kdb_rm(int argc, const char **argv)
1913 #if DBG_MAX_REG_NUM > 0
1923 return KDB_ARGCOUNT;
1925 * Allow presence or absence of leading '%' symbol.
1931 diag = kdbgetu64arg(argv[2], ®64);
1935 diag = kdb_check_regs();
1940 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1941 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1947 switch(dbg_reg_def[i].size * 8) {
1950 dbg_set_reg(i, ®8, kdb_current_regs);
1954 dbg_set_reg(i, ®16, kdb_current_regs);
1958 dbg_set_reg(i, ®32, kdb_current_regs);
1961 dbg_set_reg(i, ®64, kdb_current_regs);
1967 kdb_printf("ERROR: Register set currently not implemented\n");
1972 #if defined(CONFIG_MAGIC_SYSRQ)
1974 * kdb_sr - This function implements the 'sr' (SYSRQ key) command
1975 * which interfaces to the soi-disant MAGIC SYSRQ functionality.
1976 * sr <magic-sysrq-code>
1978 static int kdb_sr(int argc, const char **argv)
1981 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1984 return KDB_ARGCOUNT;
1987 __handle_sysrq(*argv[1], check_mask);
1992 #endif /* CONFIG_MAGIC_SYSRQ */
1995 * kdb_ef - This function implements the 'regs' (display exception
1996 * frame) command. This command takes an address and expects to
1997 * find an exception frame at that address, formats and prints
1999 * regs address-expression
2003 static int kdb_ef(int argc, const char **argv)
2011 return KDB_ARGCOUNT;
2014 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
2017 show_regs((struct pt_regs *)addr);
2021 #if defined(CONFIG_MODULES)
2023 * kdb_lsmod - This function implements the 'lsmod' command. Lists
2024 * currently loaded kernel modules.
2025 * Mostly taken from userland lsmod.
2027 static int kdb_lsmod(int argc, const char **argv)
2032 return KDB_ARGCOUNT;
2034 kdb_printf("Module Size modstruct Used by\n");
2035 list_for_each_entry(mod, kdb_modules, list) {
2036 if (mod->state == MODULE_STATE_UNFORMED)
2039 kdb_printf("%-20s%8u 0x%px ", mod->name,
2040 mod->core_layout.size, (void *)mod);
2041 #ifdef CONFIG_MODULE_UNLOAD
2042 kdb_printf("%4d ", module_refcount(mod));
2044 if (mod->state == MODULE_STATE_GOING)
2045 kdb_printf(" (Unloading)");
2046 else if (mod->state == MODULE_STATE_COMING)
2047 kdb_printf(" (Loading)");
2049 kdb_printf(" (Live)");
2050 kdb_printf(" 0x%px", mod->core_layout.base);
2052 #ifdef CONFIG_MODULE_UNLOAD
2054 struct module_use *use;
2056 list_for_each_entry(use, &mod->source_list,
2058 kdb_printf("%s ", use->target->name);
2067 #endif /* CONFIG_MODULES */
2070 * kdb_env - This function implements the 'env' command. Display the
2071 * current environment variables.
2074 static int kdb_env(int argc, const char **argv)
2078 for (i = 0; i < __nenv; i++) {
2080 kdb_printf("%s\n", __env[i]);
2083 if (KDB_DEBUG(MASK))
2084 kdb_printf("KDBDEBUG=0x%x\n",
2085 (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
2090 #ifdef CONFIG_PRINTK
2092 * kdb_dmesg - This function implements the 'dmesg' command to display
2093 * the contents of the syslog buffer.
2094 * dmesg [lines] [adjust]
2096 static int kdb_dmesg(int argc, const char **argv)
2104 struct kmsg_dumper dumper = { .active = 1 };
2109 return KDB_ARGCOUNT;
2112 lines = simple_strtol(argv[1], &cp, 0);
2116 adjust = simple_strtoul(argv[2], &cp, 0);
2117 if (*cp || adjust < 0)
2122 /* disable LOGGING if set */
2123 diag = kdbgetintenv("LOGGING", &logging);
2124 if (!diag && logging) {
2125 const char *setargs[] = { "set", "LOGGING", "0" };
2126 kdb_set(2, setargs);
2129 kmsg_dump_rewind_nolock(&dumper);
2130 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2135 kdb_printf("buffer only contains %d lines, nothing "
2137 else if (adjust - lines >= n)
2138 kdb_printf("buffer only contains %d lines, last %d "
2139 "lines printed\n", n, n - adjust);
2142 } else if (lines > 0) {
2143 skip = n - lines - adjust;
2146 kdb_printf("buffer only contains %d lines, "
2147 "nothing printed\n", n);
2149 } else if (skip < 0) {
2152 kdb_printf("buffer only contains %d lines, first "
2153 "%d lines printed\n", n, lines);
2159 if (skip >= n || skip < 0)
2162 kmsg_dump_rewind_nolock(&dumper);
2163 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2170 if (KDB_FLAG(CMD_INTERRUPT))
2173 kdb_printf("%.*s\n", (int)len - 1, buf);
2178 #endif /* CONFIG_PRINTK */
2180 /* Make sure we balance enable/disable calls, must disable first. */
2181 static atomic_t kdb_nmi_disabled;
2183 static int kdb_disable_nmi(int argc, const char *argv[])
2185 if (atomic_read(&kdb_nmi_disabled))
2187 atomic_set(&kdb_nmi_disabled, 1);
2188 arch_kgdb_ops.enable_nmi(0);
2192 static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2194 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2196 arch_kgdb_ops.enable_nmi(1);
2200 static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2201 .set = kdb_param_enable_nmi,
2203 module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2206 * kdb_cpu - This function implements the 'cpu' command.
2209 * KDB_CMD_CPU for success, a kdb diagnostic if error
2211 static void kdb_cpu_status(void)
2213 int i, start_cpu, first_print = 1;
2214 char state, prev_state = '?';
2216 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2217 kdb_printf("Available cpus: ");
2218 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2219 if (!cpu_online(i)) {
2220 state = 'F'; /* cpu is offline */
2221 } else if (!kgdb_info[i].enter_kgdb) {
2222 state = 'D'; /* cpu is online but unresponsive */
2224 state = ' '; /* cpu is responding to kdb */
2225 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2226 state = 'I'; /* idle task */
2228 if (state != prev_state) {
2229 if (prev_state != '?') {
2233 kdb_printf("%d", start_cpu);
2234 if (start_cpu < i-1)
2235 kdb_printf("-%d", i-1);
2236 if (prev_state != ' ')
2237 kdb_printf("(%c)", prev_state);
2243 /* print the trailing cpus, ignoring them if they are all offline */
2244 if (prev_state != 'F') {
2247 kdb_printf("%d", start_cpu);
2248 if (start_cpu < i-1)
2249 kdb_printf("-%d", i-1);
2250 if (prev_state != ' ')
2251 kdb_printf("(%c)", prev_state);
2256 static int kdb_cpu(int argc, const char **argv)
2258 unsigned long cpunum;
2267 return KDB_ARGCOUNT;
2269 diag = kdbgetularg(argv[1], &cpunum);
2276 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2277 return KDB_BADCPUNUM;
2279 dbg_switch_cpu = cpunum;
2282 * Switch to other cpu
2287 /* The user may not realize that ps/bta with no parameters does not print idle
2288 * or sleeping system daemon processes, so tell them how many were suppressed.
2290 void kdb_ps_suppressed(void)
2292 int idle = 0, daemon = 0;
2293 unsigned long mask_I = kdb_task_state_string("I"),
2294 mask_M = kdb_task_state_string("M");
2296 const struct task_struct *p, *g;
2297 for_each_online_cpu(cpu) {
2298 p = kdb_curr_task(cpu);
2299 if (kdb_task_state(p, mask_I))
2302 for_each_process_thread(g, p) {
2303 if (kdb_task_state(p, mask_M))
2306 if (idle || daemon) {
2308 kdb_printf("%d idle process%s (state I)%s\n",
2309 idle, idle == 1 ? "" : "es",
2310 daemon ? " and " : "");
2312 kdb_printf("%d sleeping system daemon (state M) "
2313 "process%s", daemon,
2314 daemon == 1 ? "" : "es");
2315 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2320 * kdb_ps - This function implements the 'ps' command which shows a
2321 * list of the active processes.
2322 * ps [DRSTCZEUIMA] All processes, optionally filtered by state
2324 void kdb_ps1(const struct task_struct *p)
2330 copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
2333 cpu = kdb_process_cpu(p);
2334 kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n",
2335 (void *)p, p->pid, p->parent->pid,
2336 kdb_task_has_cpu(p), kdb_process_cpu(p),
2337 kdb_task_state_char(p),
2338 (void *)(&p->thread),
2339 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2341 if (kdb_task_has_cpu(p)) {
2342 if (!KDB_TSK(cpu)) {
2343 kdb_printf(" Error: no saved data for this cpu\n");
2345 if (KDB_TSK(cpu) != p)
2346 kdb_printf(" Error: does not match running "
2347 "process table (0x%px)\n", KDB_TSK(cpu));
2352 static int kdb_ps(int argc, const char **argv)
2354 struct task_struct *g, *p;
2355 unsigned long mask, cpu;
2358 kdb_ps_suppressed();
2359 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2360 (int)(2*sizeof(void *))+2, "Task Addr",
2361 (int)(2*sizeof(void *))+2, "Thread");
2362 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2363 /* Run the active tasks first */
2364 for_each_online_cpu(cpu) {
2365 if (KDB_FLAG(CMD_INTERRUPT))
2367 p = kdb_curr_task(cpu);
2368 if (kdb_task_state(p, mask))
2372 /* Now the real tasks */
2373 for_each_process_thread(g, p) {
2374 if (KDB_FLAG(CMD_INTERRUPT))
2376 if (kdb_task_state(p, mask))
2384 * kdb_pid - This function implements the 'pid' command which switches
2385 * the currently active process.
2388 static int kdb_pid(int argc, const char **argv)
2390 struct task_struct *p;
2395 return KDB_ARGCOUNT;
2398 if (strcmp(argv[1], "R") == 0) {
2399 p = KDB_TSK(kdb_initial_cpu);
2401 diag = kdbgetularg(argv[1], &val);
2405 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2407 kdb_printf("No task with pid=%d\n", (pid_t)val);
2411 kdb_set_current_task(p);
2413 kdb_printf("KDB current process is %s(pid=%d)\n",
2414 kdb_current_task->comm,
2415 kdb_current_task->pid);
2420 static int kdb_kgdb(int argc, const char **argv)
2422 return KDB_CMD_KGDB;
2426 * kdb_help - This function implements the 'help' and '?' commands.
2428 static int kdb_help(int argc, const char **argv)
2433 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2434 kdb_printf("-----------------------------"
2435 "-----------------------------\n");
2436 for_each_kdbcmd(kt, i) {
2438 if (KDB_FLAG(CMD_INTERRUPT))
2442 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2444 if (strlen(kt->cmd_usage) > 20)
2446 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2447 kt->cmd_usage, space, kt->cmd_help);
2453 * kdb_kill - This function implements the 'kill' commands.
2455 static int kdb_kill(int argc, const char **argv)
2459 struct task_struct *p;
2462 return KDB_ARGCOUNT;
2464 sig = simple_strtol(argv[1], &endp, 0);
2467 if ((sig >= 0) || !valid_signal(-sig)) {
2468 kdb_printf("Invalid signal parameter.<-signal>\n");
2473 pid = simple_strtol(argv[2], &endp, 0);
2477 kdb_printf("Process ID must be large than 0.\n");
2481 /* Find the process. */
2482 p = find_task_by_pid_ns(pid, &init_pid_ns);
2484 kdb_printf("The specified process isn't found.\n");
2487 p = p->group_leader;
2488 kdb_send_sig(p, sig);
2493 * Most of this code has been lifted from kernel/timer.c::sys_sysinfo().
2494 * I cannot call that code directly from kdb, it has an unconditional
2495 * cli()/sti() and calls routines that take locks which can stop the debugger.
2497 static void kdb_sysinfo(struct sysinfo *val)
2499 u64 uptime = ktime_get_mono_fast_ns();
2501 memset(val, 0, sizeof(*val));
2502 val->uptime = div_u64(uptime, NSEC_PER_SEC);
2503 val->loads[0] = avenrun[0];
2504 val->loads[1] = avenrun[1];
2505 val->loads[2] = avenrun[2];
2506 val->procs = nr_threads-1;
2513 * kdb_summary - This function implements the 'summary' command.
2515 static int kdb_summary(int argc, const char **argv)
2522 return KDB_ARGCOUNT;
2524 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2525 kdb_printf("release %s\n", init_uts_ns.name.release);
2526 kdb_printf("version %s\n", init_uts_ns.name.version);
2527 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2528 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2529 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2531 now = __ktime_get_real_seconds();
2532 time64_to_tm(now, 0, &tm);
2533 kdb_printf("date %04ld-%02d-%02d %02d:%02d:%02d "
2534 "tz_minuteswest %d\n",
2535 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2536 tm.tm_hour, tm.tm_min, tm.tm_sec,
2537 sys_tz.tz_minuteswest);
2540 kdb_printf("uptime ");
2541 if (val.uptime > (24*60*60)) {
2542 int days = val.uptime / (24*60*60);
2543 val.uptime %= (24*60*60);
2544 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2546 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2548 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2549 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2550 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2551 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2553 /* Display in kilobytes */
2554 #define K(x) ((x) << (PAGE_SHIFT - 10))
2555 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2556 "Buffers: %8lu kB\n",
2557 K(val.totalram), K(val.freeram), K(val.bufferram));
2562 * kdb_per_cpu - This function implements the 'per_cpu' command.
2564 static int kdb_per_cpu(int argc, const char **argv)
2567 int cpu, diag, nextarg = 1;
2568 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2570 if (argc < 1 || argc > 3)
2571 return KDB_ARGCOUNT;
2573 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2578 diag = kdbgetularg(argv[2], &bytesperword);
2583 bytesperword = KDB_WORD_SIZE;
2584 else if (bytesperword > KDB_WORD_SIZE)
2585 return KDB_BADWIDTH;
2586 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2588 diag = kdbgetularg(argv[3], &whichcpu);
2591 if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) {
2592 kdb_printf("cpu %ld is not online\n", whichcpu);
2593 return KDB_BADCPUNUM;
2597 /* Most architectures use __per_cpu_offset[cpu], some use
2598 * __per_cpu_offset(cpu), smp has no __per_cpu_offset.
2600 #ifdef __per_cpu_offset
2601 #define KDB_PCU(cpu) __per_cpu_offset(cpu)
2604 #define KDB_PCU(cpu) __per_cpu_offset[cpu]
2606 #define KDB_PCU(cpu) 0
2609 for_each_online_cpu(cpu) {
2610 if (KDB_FLAG(CMD_INTERRUPT))
2613 if (whichcpu != ~0UL && whichcpu != cpu)
2615 addr = symaddr + KDB_PCU(cpu);
2616 diag = kdb_getword(&val, addr, bytesperword);
2618 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2619 "read, diag=%d\n", cpu, addr, diag);
2622 kdb_printf("%5d ", cpu);
2623 kdb_md_line(fmtstr, addr,
2624 bytesperword == KDB_WORD_SIZE,
2625 1, bytesperword, 1, 1, 0);
2632 * display help for the use of cmd | grep pattern
2634 static int kdb_grep_help(int argc, const char **argv)
2636 kdb_printf("Usage of cmd args | grep pattern:\n");
2637 kdb_printf(" Any command's output may be filtered through an ");
2638 kdb_printf("emulated 'pipe'.\n");
2639 kdb_printf(" 'grep' is just a key word.\n");
2640 kdb_printf(" The pattern may include a very limited set of "
2641 "metacharacters:\n");
2642 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2643 kdb_printf(" And if there are spaces in the pattern, you may "
2645 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2646 " or \"^pat tern$\"\n");
2651 * kdb_register_flags - This function is used to register a kernel
2655 * func Function to execute the command
2656 * usage A simple usage string showing arguments
2657 * help A simple help string describing command
2658 * repeat Does the command auto repeat on enter?
2660 * zero for success, one if a duplicate command.
2662 #define kdb_command_extend 50 /* arbitrary */
2663 int kdb_register_flags(char *cmd,
2668 kdb_cmdflags_t flags)
2674 * Brute force method to determine duplicates
2676 for_each_kdbcmd(kp, i) {
2677 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2678 kdb_printf("Duplicate kdb command registered: "
2679 "%s, func %px help %s\n", cmd, func, help);
2685 * Insert command into first available location in table
2687 for_each_kdbcmd(kp, i) {
2688 if (kp->cmd_name == NULL)
2692 if (i >= kdb_max_commands) {
2693 kdbtab_t *new = kmalloc_array(kdb_max_commands -
2699 kdb_printf("Could not allocate new kdb_command "
2704 memcpy(new, kdb_commands,
2705 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2706 kfree(kdb_commands);
2708 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2709 kdb_command_extend * sizeof(*new));
2711 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2712 kdb_max_commands += kdb_command_extend;
2716 kp->cmd_func = func;
2717 kp->cmd_usage = usage;
2718 kp->cmd_help = help;
2719 kp->cmd_minlen = minlen;
2720 kp->cmd_flags = flags;
2724 EXPORT_SYMBOL_GPL(kdb_register_flags);
2728 * kdb_register - Compatibility register function for commands that do
2729 * not need to specify a repeat state. Equivalent to
2730 * kdb_register_flags with flags set to 0.
2733 * func Function to execute the command
2734 * usage A simple usage string showing arguments
2735 * help A simple help string describing command
2737 * zero for success, one if a duplicate command.
2739 int kdb_register(char *cmd,
2745 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2747 EXPORT_SYMBOL_GPL(kdb_register);
2750 * kdb_unregister - This function is used to unregister a kernel
2751 * debugger command. It is generally called when a module which
2752 * implements kdb commands is unloaded.
2756 * zero for success, one command not registered.
2758 int kdb_unregister(char *cmd)
2766 for_each_kdbcmd(kp, i) {
2767 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2768 kp->cmd_name = NULL;
2773 /* Couldn't find it. */
2776 EXPORT_SYMBOL_GPL(kdb_unregister);
2778 /* Initialize the kdb command table. */
2779 static void __init kdb_inittab(void)
2784 for_each_kdbcmd(kp, i)
2785 kp->cmd_name = NULL;
2787 kdb_register_flags("md", kdb_md, "<vaddr>",
2788 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2789 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2790 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2791 "Display Raw Memory", 0,
2792 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2793 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2794 "Display Physical Memory", 0,
2795 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2796 kdb_register_flags("mds", kdb_md, "<vaddr>",
2797 "Display Memory Symbolically", 0,
2798 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2799 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2800 "Modify Memory Contents", 0,
2801 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2802 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2803 "Continue Execution", 1,
2804 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2805 kdb_register_flags("rd", kdb_rd, "",
2806 "Display Registers", 0,
2807 KDB_ENABLE_REG_READ);
2808 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2809 "Modify Registers", 0,
2810 KDB_ENABLE_REG_WRITE);
2811 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2812 "Display exception frame", 0,
2813 KDB_ENABLE_MEM_READ);
2814 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2815 "Stack traceback", 1,
2816 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2817 kdb_register_flags("btp", kdb_bt, "<pid>",
2818 "Display stack for process <pid>", 0,
2819 KDB_ENABLE_INSPECT);
2820 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2821 "Backtrace all processes matching state flag", 0,
2822 KDB_ENABLE_INSPECT);
2823 kdb_register_flags("btc", kdb_bt, "",
2824 "Backtrace current process on each cpu", 0,
2825 KDB_ENABLE_INSPECT);
2826 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2827 "Backtrace process given its struct task address", 0,
2828 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2829 kdb_register_flags("env", kdb_env, "",
2830 "Show environment variables", 0,
2831 KDB_ENABLE_ALWAYS_SAFE);
2832 kdb_register_flags("set", kdb_set, "",
2833 "Set environment variables", 0,
2834 KDB_ENABLE_ALWAYS_SAFE);
2835 kdb_register_flags("help", kdb_help, "",
2836 "Display Help Message", 1,
2837 KDB_ENABLE_ALWAYS_SAFE);
2838 kdb_register_flags("?", kdb_help, "",
2839 "Display Help Message", 0,
2840 KDB_ENABLE_ALWAYS_SAFE);
2841 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2842 "Switch to new cpu", 0,
2843 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2844 kdb_register_flags("kgdb", kdb_kgdb, "",
2845 "Enter kgdb mode", 0, 0);
2846 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2847 "Display active task list", 0,
2848 KDB_ENABLE_INSPECT);
2849 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2850 "Switch to another task", 0,
2851 KDB_ENABLE_INSPECT);
2852 kdb_register_flags("reboot", kdb_reboot, "",
2853 "Reboot the machine immediately", 0,
2855 #if defined(CONFIG_MODULES)
2856 kdb_register_flags("lsmod", kdb_lsmod, "",
2857 "List loaded kernel modules", 0,
2858 KDB_ENABLE_INSPECT);
2860 #if defined(CONFIG_MAGIC_SYSRQ)
2861 kdb_register_flags("sr", kdb_sr, "<key>",
2862 "Magic SysRq key", 0,
2863 KDB_ENABLE_ALWAYS_SAFE);
2865 #if defined(CONFIG_PRINTK)
2866 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2867 "Display syslog buffer", 0,
2868 KDB_ENABLE_ALWAYS_SAFE);
2870 if (arch_kgdb_ops.enable_nmi) {
2871 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2872 "Disable NMI entry to KDB", 0,
2873 KDB_ENABLE_ALWAYS_SAFE);
2875 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2876 "Define a set of commands, down to endefcmd", 0,
2877 KDB_ENABLE_ALWAYS_SAFE);
2878 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2879 "Send a signal to a process", 0,
2881 kdb_register_flags("summary", kdb_summary, "",
2882 "Summarize the system", 4,
2883 KDB_ENABLE_ALWAYS_SAFE);
2884 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2885 "Display per_cpu variables", 3,
2886 KDB_ENABLE_MEM_READ);
2887 kdb_register_flags("grephelp", kdb_grep_help, "",
2888 "Display help on | grep", 0,
2889 KDB_ENABLE_ALWAYS_SAFE);
2892 /* Execute any commands defined in kdb_cmds. */
2893 static void __init kdb_cmd_init(void)
2896 for (i = 0; kdb_cmds[i]; ++i) {
2897 diag = kdb_parse(kdb_cmds[i]);
2899 kdb_printf("kdb command %s failed, kdb diag %d\n",
2902 if (defcmd_in_progress) {
2903 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2904 kdb_parse("endefcmd");
2908 /* Initialize kdb_printf, breakpoint tables and kdb state */
2909 void __init kdb_init(int lvl)
2911 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2914 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2916 for (i = kdb_init_lvl; i < lvl; i++) {
2918 case KDB_NOT_INITIALIZED:
2919 kdb_inittab(); /* Initialize Command Table */
2920 kdb_initbptab(); /* Initialize Breakpoints */
2922 case KDB_INIT_EARLY:
2923 kdb_cmd_init(); /* Build kdb_cmds tables */