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 <asm/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 /*
  32  * kdb_diemsg
  33  *
  34  *      Contains a pointer to the last string supplied to the
  35  *      kernel 'die' panic function.
  36  */
  37 extern const char *kdb_diemsg;
  38
  39 #define KDB_FLAG_EARLYKDB       (1 << 0) /* set from boot parameter kdb=early */
  40 #define KDB_FLAG_CATASTROPHIC   (1 << 1) /* A catastrophic event has occurred */
  41 #define KDB_FLAG_CMD_INTERRUPT  (1 << 2) /* Previous command was interrupted */
  42 #define KDB_FLAG_NOIPI          (1 << 3) /* Do not send IPIs */
  43 #define KDB_FLAG_ONLY_DO_DUMP   (1 << 4) /* Only do a dump, used when
  44                                           * kdb is off */
  45 #define KDB_FLAG_NO_CONSOLE     (1 << 5) /* No console is available,
  46                                           * kdb is disabled */
  47 #define KDB_FLAG_NO_VT_CONSOLE  (1 << 6) /* No VT console is available, do
  48                                           * not use keyboard */
  49 #define KDB_FLAG_NO_I8042       (1 << 7) /* No i8042 chip is available, do
  50                                           * not use keyboard */
  51
  52 extern int kdb_flags;   /* Global flags, see kdb_state for per cpu state */
  53
  54 extern void kdb_save_flags(void);
  55 extern void kdb_restore_flags(void);
  56
  57 #define KDB_FLAG(flag)          (kdb_flags & KDB_FLAG_##flag)
  58 #define KDB_FLAG_SET(flag)      ((void)(kdb_flags |= KDB_FLAG_##flag))
  59 #define KDB_FLAG_CLEAR(flag)    ((void)(kdb_flags &= ~KDB_FLAG_##flag))
  60
  61 /*
  62  * External entry point for the kernel debugger.  The pt_regs
  63  * at the time of entry are supplied along with the reason for
  64  * entry to the kernel debugger.
  65  */
  66
  67 typedef enum {
  68         KDB_REASON_ENTER = 1,   /* KDB_ENTER() trap/fault - regs valid */
  69         KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
  70         KDB_REASON_BREAK,       /* Breakpoint inst. - regs valid */
  71         KDB_REASON_DEBUG,       /* Debug Fault - regs valid */
  72         KDB_REASON_OOPS,        /* Kernel Oops - regs valid */
  73         KDB_REASON_SWITCH,      /* CPU switch - regs valid*/
  74         KDB_REASON_KEYBOARD,    /* Keyboard entry - regs valid */
  75         KDB_REASON_NMI,         /* Non-maskable interrupt; regs valid */
  76         KDB_REASON_RECURSE,     /* Recursive entry to kdb;
  77                                  * regs probably valid */
  78         KDB_REASON_SSTEP,       /* Single Step trap. - regs valid */
  79 } kdb_reason_t;
  80
  81 extern int kdb_trap_printk;
  82 extern int vkdb_printf(const char *fmt, va_list args)
  83             __attribute__ ((format (printf, 1, 0)));
  84 extern int kdb_printf(const char *, ...)
  85             __attribute__ ((format (printf, 1, 2)));
  86 typedef int (*kdb_printf_t)(const char *, ...)
  87              __attribute__ ((format (printf, 1, 2)));
  88
  89 extern void kdb_init(int level);
  90
  91 /* Access to kdb specific polling devices */
  92 typedef int (*get_char_func)(void);
  93 extern get_char_func kdb_poll_funcs[];
  94 extern int kdb_get_kbd_char(void);
  95
  96 static inline
  97 int kdb_process_cpu(const struct task_struct *p)
  98 {
  99         unsigned int cpu = task_thread_info(p)->cpu;
 100         if (cpu > num_possible_cpus())
 101                 cpu = 0;
 102         return cpu;
 103 }
 104
 105 /* kdb access to register set for stack dumping */
 106 extern struct pt_regs *kdb_current_regs;
 107
 108 #else /* ! CONFIG_KGDB_KDB */
 109 #define kdb_printf(...)
 110 #define kdb_init(x)
 111 #endif  /* CONFIG_KGDB_KDB */
 112 enum {
 113         KDB_NOT_INITIALIZED,
 114         KDB_INIT_EARLY,
 115         KDB_INIT_FULL,
 116 };
 117 #endif  /* !_KDB_H */