linux/include/linux/kdb.h
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   1#ifndef _KDB_H
   2#define _KDB_H
   3
   4/*
   5 * Kernel Debugger Architecture Independent Global Headers
   6 *
   7 * This file is subject to the terms and conditions of the GNU General Public
   8 * License.  See the file "COPYING" in the main directory of this archive
   9 * for more details.
  10 *
  11 * Copyright (c) 2000-2007 Silicon Graphics, Inc.  All Rights Reserved.
  12 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
  13 * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
  14 */
  15
  16typedef enum {
  17        KDB_REPEAT_NONE = 0,    /* Do not repeat this command */
  18        KDB_REPEAT_NO_ARGS,     /* Repeat the command without arguments */
  19        KDB_REPEAT_WITH_ARGS,   /* Repeat the command including its arguments */
  20} kdb_repeat_t;
  21
  22typedef int (*kdb_func_t)(int, const char **);
  23
  24#ifdef  CONFIG_KGDB_KDB
  25#include <linux/init.h>
  26#include <linux/sched.h>
  27#include <linux/atomic.h>
  28
  29#define KDB_POLL_FUNC_MAX       5
  30extern int kdb_poll_idx;
  31
  32/*
  33 * kdb_initial_cpu is initialized to -1, and is set to the cpu
  34 * number whenever the kernel debugger is entered.
  35 */
  36extern int kdb_initial_cpu;
  37extern atomic_t kdb_event;
  38
  39/* Types and messages used for dynamically added kdb shell commands */
  40
  41#define KDB_MAXARGS    16 /* Maximum number of arguments to a function  */
  42
  43/* KDB return codes from a command or internal kdb function */
  44#define KDB_NOTFOUND    (-1)
  45#define KDB_ARGCOUNT    (-2)
  46#define KDB_BADWIDTH    (-3)
  47#define KDB_BADRADIX    (-4)
  48#define KDB_NOTENV      (-5)
  49#define KDB_NOENVVALUE  (-6)
  50#define KDB_NOTIMP      (-7)
  51#define KDB_ENVFULL     (-8)
  52#define KDB_ENVBUFFULL  (-9)
  53#define KDB_TOOMANYBPT  (-10)
  54#define KDB_TOOMANYDBREGS (-11)
  55#define KDB_DUPBPT      (-12)
  56#define KDB_BPTNOTFOUND (-13)
  57#define KDB_BADMODE     (-14)
  58#define KDB_BADINT      (-15)
  59#define KDB_INVADDRFMT  (-16)
  60#define KDB_BADREG      (-17)
  61#define KDB_BADCPUNUM   (-18)
  62#define KDB_BADLENGTH   (-19)
  63#define KDB_NOBP        (-20)
  64#define KDB_BADADDR     (-21)
  65
  66/*
  67 * kdb_diemsg
  68 *
  69 *      Contains a pointer to the last string supplied to the
  70 *      kernel 'die' panic function.
  71 */
  72extern const char *kdb_diemsg;
  73
  74#define KDB_FLAG_EARLYKDB       (1 << 0) /* set from boot parameter kdb=early */
  75#define KDB_FLAG_CATASTROPHIC   (1 << 1) /* A catastrophic event has occurred */
  76#define KDB_FLAG_CMD_INTERRUPT  (1 << 2) /* Previous command was interrupted */
  77#define KDB_FLAG_NOIPI          (1 << 3) /* Do not send IPIs */
  78#define KDB_FLAG_NO_CONSOLE     (1 << 5) /* No console is available,
  79                                          * kdb is disabled */
  80#define KDB_FLAG_NO_VT_CONSOLE  (1 << 6) /* No VT console is available, do
  81                                          * not use keyboard */
  82#define KDB_FLAG_NO_I8042       (1 << 7) /* No i8042 chip is available, do
  83                                          * not use keyboard */
  84
  85extern int kdb_flags;   /* Global flags, see kdb_state for per cpu state */
  86
  87extern void kdb_save_flags(void);
  88extern void kdb_restore_flags(void);
  89
  90#define KDB_FLAG(flag)          (kdb_flags & KDB_FLAG_##flag)
  91#define KDB_FLAG_SET(flag)      ((void)(kdb_flags |= KDB_FLAG_##flag))
  92#define KDB_FLAG_CLEAR(flag)    ((void)(kdb_flags &= ~KDB_FLAG_##flag))
  93
  94/*
  95 * External entry point for the kernel debugger.  The pt_regs
  96 * at the time of entry are supplied along with the reason for
  97 * entry to the kernel debugger.
  98 */
  99
 100typedef enum {
 101        KDB_REASON_ENTER = 1,   /* KDB_ENTER() trap/fault - regs valid */
 102        KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
 103        KDB_REASON_BREAK,       /* Breakpoint inst. - regs valid */
 104        KDB_REASON_DEBUG,       /* Debug Fault - regs valid */
 105        KDB_REASON_OOPS,        /* Kernel Oops - regs valid */
 106        KDB_REASON_SWITCH,      /* CPU switch - regs valid*/
 107        KDB_REASON_KEYBOARD,    /* Keyboard entry - regs valid */
 108        KDB_REASON_NMI,         /* Non-maskable interrupt; regs valid */
 109        KDB_REASON_RECURSE,     /* Recursive entry to kdb;
 110                                 * regs probably valid */
 111        KDB_REASON_SSTEP,       /* Single Step trap. - regs valid */
 112} kdb_reason_t;
 113
 114extern int kdb_trap_printk;
 115extern __printf(1, 0) int vkdb_printf(const char *fmt, va_list args);
 116extern __printf(1, 2) int kdb_printf(const char *, ...);
 117typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);
 118
 119extern void kdb_init(int level);
 120
 121/* Access to kdb specific polling devices */
 122typedef int (*get_char_func)(void);
 123extern get_char_func kdb_poll_funcs[];
 124extern int kdb_get_kbd_char(void);
 125
 126static inline
 127int kdb_process_cpu(const struct task_struct *p)
 128{
 129        unsigned int cpu = task_thread_info(p)->cpu;
 130        if (cpu > num_possible_cpus())
 131                cpu = 0;
 132        return cpu;
 133}
 134
 135/* kdb access to register set for stack dumping */
 136extern struct pt_regs *kdb_current_regs;
 137#ifdef CONFIG_KALLSYMS
 138extern const char *kdb_walk_kallsyms(loff_t *pos);
 139#else /* ! CONFIG_KALLSYMS */
 140static inline const char *kdb_walk_kallsyms(loff_t *pos)
 141{
 142        return NULL;
 143}
 144#endif /* ! CONFIG_KALLSYMS */
 145
 146/* Dynamic kdb shell command registration */
 147extern int kdb_register(char *, kdb_func_t, char *, char *, short);
 148extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
 149                               short, kdb_repeat_t);
 150extern int kdb_unregister(char *);
 151#else /* ! CONFIG_KGDB_KDB */
 152static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
 153static inline void kdb_init(int level) {}
 154static inline int kdb_register(char *cmd, kdb_func_t func, char *usage,
 155                               char *help, short minlen) { return 0; }
 156static inline int kdb_register_repeat(char *cmd, kdb_func_t func, char *usage,
 157                                      char *help, short minlen,
 158                                      kdb_repeat_t repeat) { return 0; }
 159static inline int kdb_unregister(char *cmd) { return 0; }
 160#endif  /* CONFIG_KGDB_KDB */
 161enum {
 162        KDB_NOT_INITIALIZED,
 163        KDB_INIT_EARLY,
 164        KDB_INIT_FULL,
 165};
 166
 167extern int kdbgetintenv(const char *, int *);
 168extern int kdb_set(int, const char **);
 169
 170#endif  /* !_KDB_H */
 171
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