include/linux/kdb.h

   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
  16 #ifdef  CONFIG_KGDB_KDB
  17 #include <linux/init.h>
  18 #include <linux/sched.h>
  19 #include <linux/atomic.h>
  20
  21 #define KDB_POLL_FUNC_MAX       5
  22 extern int kdb_poll_idx;
  23
  24 /*
  25  * kdb_initial_cpu is initialized to -1, and is set to the cpu
  26  * number whenever the kernel debugger is entered.
  27  */
  28 extern int kdb_initial_cpu;
  29 extern atomic_t kdb_event;
  30
  31 /* Types and messages used for dynamically added kdb shell commands */
  32
  33 #define KDB_MAXARGS    16 /* Maximum number of arguments to a function  */
  34
  35 typedef enum {
  36         KDB_REPEAT_NONE = 0,    /* Do not repeat this command */
  37         KDB_REPEAT_NO_ARGS,     /* Repeat the command without arguments */
  38         KDB_REPEAT_WITH_ARGS,   /* Repeat the command including its arguments */
  39 } kdb_repeat_t;
  40
  41 typedef int (*kdb_func_t)(int, const char **);
  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  */
  72 extern 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_ONLY_DO_DUMP   (1 << 4) /* Only do a dump, used when
  79                                           * kdb is off */
  80 #define KDB_FLAG_NO_CONSOLE     (1 << 5) /* No console is available,
  81                                           * kdb is disabled */
  82 #define KDB_FLAG_NO_VT_CONSOLE  (1 << 6) /* No VT console is available, do
  83                                           * not use keyboard */
  84 #define KDB_FLAG_NO_I8042       (1 << 7) /* No i8042 chip is available, do
  85                                           * not use keyboard */
  86
  87 extern int kdb_flags;   /* Global flags, see kdb_state for per cpu state */
  88
  89 extern void kdb_save_flags(void);
  90 extern void kdb_restore_flags(void);
  91
  92 #define KDB_FLAG(flag)          (kdb_flags & KDB_FLAG_##flag)
  93 #define KDB_FLAG_SET(flag)      ((void)(kdb_flags |= KDB_FLAG_##flag))
  94 #define KDB_FLAG_CLEAR(flag)    ((void)(kdb_flags &= ~KDB_FLAG_##flag))
  95
  96 /*
  97  * External entry point for the kernel debugger.  The pt_regs
  98  * at the time of entry are supplied along with the reason for
  99  * entry to the kernel debugger.
 100  */
 101
 102 typedef enum {
 103         KDB_REASON_ENTER = 1,   /* KDB_ENTER() trap/fault - regs valid */
 104         KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
 105         KDB_REASON_BREAK,       /* Breakpoint inst. - regs valid */
 106         KDB_REASON_DEBUG,       /* Debug Fault - regs valid */
 107         KDB_REASON_OOPS,        /* Kernel Oops - regs valid */
 108         KDB_REASON_SWITCH,      /* CPU switch - regs valid*/
 109         KDB_REASON_KEYBOARD,    /* Keyboard entry - regs valid */
 110         KDB_REASON_NMI,         /* Non-maskable interrupt; regs valid */
 111         KDB_REASON_RECURSE,     /* Recursive entry to kdb;
 112                                  * regs probably valid */
 113         KDB_REASON_SSTEP,       /* Single Step trap. - regs valid */
 114 } kdb_reason_t;
 115
 116 extern int kdb_trap_printk;
 117 extern __printf(1, 0) int vkdb_printf(const char *fmt, va_list args);
 118 extern __printf(1, 2) int kdb_printf(const char *, ...);
 119 typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);
 120
 121 extern void kdb_init(int level);
 122
 123 /* Access to kdb specific polling devices */
 124 typedef int (*get_char_func)(void);
 125 extern get_char_func kdb_poll_funcs[];
 126 extern int kdb_get_kbd_char(void);
 127
 128 static inline
 129 int kdb_process_cpu(const struct task_struct *p)
 130 {
 131         unsigned int cpu = task_thread_info(p)->cpu;
 132         if (cpu > num_possible_cpus())
 133                 cpu = 0;
 134         return cpu;
 135 }
 136
 137 /* kdb access to register set for stack dumping */
 138 extern struct pt_regs *kdb_current_regs;
 139 #ifdef CONFIG_KALLSYMS
 140 extern const char *kdb_walk_kallsyms(loff_t *pos);
 141 #else /* ! CONFIG_KALLSYMS */
 142 static inline const char *kdb_walk_kallsyms(loff_t *pos)
 143 {
 144         return NULL;
 145 }
 146 #endif /* ! CONFIG_KALLSYMS */
 147
 148 /* Dynamic kdb shell command registration */
 149 extern int kdb_register(char *, kdb_func_t, char *, char *, short);
 150 extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
 151                                short, kdb_repeat_t);
 152 extern int kdb_unregister(char *);
 153 #else /* ! CONFIG_KGDB_KDB */
 154 #define kdb_printf(...)
 155 #define kdb_init(x)
 156 #define kdb_register(...)
 157 #define kdb_register_repeat(...)
 158 #define kdb_uregister(x)
 159 #endif  /* CONFIG_KGDB_KDB */
 160 enum {
 161         KDB_NOT_INITIALIZED,
 162         KDB_INIT_EARLY,
 163         KDB_INIT_FULL,
 164 };
 165
 166 extern int kdbgetintenv(const char *, int *);
 167 extern int kdb_set(int, const char **);
 168
 169 #endif  /* !_KDB_H */