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 /* Shifted versions of the command enable bits are be used if the command
  17  * has no arguments (see kdb_check_flags). This allows commands, such as
  18  * go, to have different permissions depending upon whether it is called
  19  * with an argument.
  20  */
  21 #define KDB_ENABLE_NO_ARGS_SHIFT 10
  22
  23 typedef enum {
  24         KDB_ENABLE_ALL = (1 << 0), /* Enable everything */
  25         KDB_ENABLE_MEM_READ = (1 << 1),
  26         KDB_ENABLE_MEM_WRITE = (1 << 2),
  27         KDB_ENABLE_REG_READ = (1 << 3),
  28         KDB_ENABLE_REG_WRITE = (1 << 4),
  29         KDB_ENABLE_INSPECT = (1 << 5),
  30         KDB_ENABLE_FLOW_CTRL = (1 << 6),
  31         KDB_ENABLE_SIGNAL = (1 << 7),
  32         KDB_ENABLE_REBOOT = (1 << 8),
  33         /* User exposed values stop here, all remaining flags are
  34          * exclusively used to describe a commands behaviour.
  35          */
  36
  37         KDB_ENABLE_ALWAYS_SAFE = (1 << 9),
  38         KDB_ENABLE_MASK = (1 << KDB_ENABLE_NO_ARGS_SHIFT) - 1,
  39
  40         KDB_ENABLE_ALL_NO_ARGS = KDB_ENABLE_ALL << KDB_ENABLE_NO_ARGS_SHIFT,
  41         KDB_ENABLE_MEM_READ_NO_ARGS = KDB_ENABLE_MEM_READ
  42                                       << KDB_ENABLE_NO_ARGS_SHIFT,
  43         KDB_ENABLE_MEM_WRITE_NO_ARGS = KDB_ENABLE_MEM_WRITE
  44                                        << KDB_ENABLE_NO_ARGS_SHIFT,
  45         KDB_ENABLE_REG_READ_NO_ARGS = KDB_ENABLE_REG_READ
  46                                       << KDB_ENABLE_NO_ARGS_SHIFT,
  47         KDB_ENABLE_REG_WRITE_NO_ARGS = KDB_ENABLE_REG_WRITE
  48                                        << KDB_ENABLE_NO_ARGS_SHIFT,
  49         KDB_ENABLE_INSPECT_NO_ARGS = KDB_ENABLE_INSPECT
  50                                      << KDB_ENABLE_NO_ARGS_SHIFT,
  51         KDB_ENABLE_FLOW_CTRL_NO_ARGS = KDB_ENABLE_FLOW_CTRL
  52                                        << KDB_ENABLE_NO_ARGS_SHIFT,
  53         KDB_ENABLE_SIGNAL_NO_ARGS = KDB_ENABLE_SIGNAL
  54                                     << KDB_ENABLE_NO_ARGS_SHIFT,
  55         KDB_ENABLE_REBOOT_NO_ARGS = KDB_ENABLE_REBOOT
  56                                     << KDB_ENABLE_NO_ARGS_SHIFT,
  57         KDB_ENABLE_ALWAYS_SAFE_NO_ARGS = KDB_ENABLE_ALWAYS_SAFE
  58                                          << KDB_ENABLE_NO_ARGS_SHIFT,
  59         KDB_ENABLE_MASK_NO_ARGS = KDB_ENABLE_MASK << KDB_ENABLE_NO_ARGS_SHIFT,
  60
  61         KDB_REPEAT_NO_ARGS = 0x40000000, /* Repeat the command w/o arguments */
  62         KDB_REPEAT_WITH_ARGS = 0x80000000, /* Repeat the command with args */
  63 } kdb_cmdflags_t;
  64
  65 typedef int (*kdb_func_t)(int, const char **);
  66
  67 #ifdef  CONFIG_KGDB_KDB
  68 #include <linux/init.h>
  69 #include <linux/sched.h>
  70 #include <linux/atomic.h>
  71
  72 #define KDB_POLL_FUNC_MAX       5
  73 extern int kdb_poll_idx;
  74
  75 /*
  76  * kdb_initial_cpu is initialized to -1, and is set to the cpu
  77  * number whenever the kernel debugger is entered.
  78  */
  79 extern int kdb_initial_cpu;
  80 extern atomic_t kdb_event;
  81
  82 /* Types and messages used for dynamically added kdb shell commands */
  83
  84 #define KDB_MAXARGS    16 /* Maximum number of arguments to a function  */
  85
  86 /* KDB return codes from a command or internal kdb function */
  87 #define KDB_NOTFOUND    (-1)
  88 #define KDB_ARGCOUNT    (-2)
  89 #define KDB_BADWIDTH    (-3)
  90 #define KDB_BADRADIX    (-4)
  91 #define KDB_NOTENV      (-5)
  92 #define KDB_NOENVVALUE  (-6)
  93 #define KDB_NOTIMP      (-7)
  94 #define KDB_ENVFULL     (-8)
  95 #define KDB_ENVBUFFULL  (-9)
  96 #define KDB_TOOMANYBPT  (-10)
  97 #define KDB_TOOMANYDBREGS (-11)
  98 #define KDB_DUPBPT      (-12)
  99 #define KDB_BPTNOTFOUND (-13)
 100 #define KDB_BADMODE     (-14)
 101 #define KDB_BADINT      (-15)
 102 #define KDB_INVADDRFMT  (-16)
 103 #define KDB_BADREG      (-17)
 104 #define KDB_BADCPUNUM   (-18)
 105 #define KDB_BADLENGTH   (-19)
 106 #define KDB_NOBP        (-20)
 107 #define KDB_BADADDR     (-21)
 108 #define KDB_NOPERM      (-22)
 109
 110 /*
 111  * kdb_diemsg
 112  *
 113  *      Contains a pointer to the last string supplied to the
 114  *      kernel 'die' panic function.
 115  */
 116 extern const char *kdb_diemsg;
 117
 118 #define KDB_FLAG_EARLYKDB       (1 << 0) /* set from boot parameter kdb=early */
 119 #define KDB_FLAG_CATASTROPHIC   (1 << 1) /* A catastrophic event has occurred */
 120 #define KDB_FLAG_CMD_INTERRUPT  (1 << 2) /* Previous command was interrupted */
 121 #define KDB_FLAG_NOIPI          (1 << 3) /* Do not send IPIs */
 122 #define KDB_FLAG_NO_CONSOLE     (1 << 5) /* No console is available,
 123                                           * kdb is disabled */
 124 #define KDB_FLAG_NO_VT_CONSOLE  (1 << 6) /* No VT console is available, do
 125                                           * not use keyboard */
 126 #define KDB_FLAG_NO_I8042       (1 << 7) /* No i8042 chip is available, do
 127                                           * not use keyboard */
 128
 129 extern int kdb_flags;   /* Global flags, see kdb_state for per cpu state */
 130
 131 extern void kdb_save_flags(void);
 132 extern void kdb_restore_flags(void);
 133
 134 #define KDB_FLAG(flag)          (kdb_flags & KDB_FLAG_##flag)
 135 #define KDB_FLAG_SET(flag)      ((void)(kdb_flags |= KDB_FLAG_##flag))
 136 #define KDB_FLAG_CLEAR(flag)    ((void)(kdb_flags &= ~KDB_FLAG_##flag))
 137
 138 /*
 139  * External entry point for the kernel debugger.  The pt_regs
 140  * at the time of entry are supplied along with the reason for
 141  * entry to the kernel debugger.
 142  */
 143
 144 typedef enum {
 145         KDB_REASON_ENTER = 1,   /* KDB_ENTER() trap/fault - regs valid */
 146         KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
 147         KDB_REASON_BREAK,       /* Breakpoint inst. - regs valid */
 148         KDB_REASON_DEBUG,       /* Debug Fault - regs valid */
 149         KDB_REASON_OOPS,        /* Kernel Oops - regs valid */
 150         KDB_REASON_SWITCH,      /* CPU switch - regs valid*/
 151         KDB_REASON_KEYBOARD,    /* Keyboard entry - regs valid */
 152         KDB_REASON_NMI,         /* Non-maskable interrupt; regs valid */
 153         KDB_REASON_RECURSE,     /* Recursive entry to kdb;
 154                                  * regs probably valid */
 155         KDB_REASON_SSTEP,       /* Single Step trap. - regs valid */
 156         KDB_REASON_SYSTEM_NMI,  /* In NMI due to SYSTEM cmd; regs valid */
 157 } kdb_reason_t;
 158
 159 enum kdb_msgsrc {
 160         KDB_MSGSRC_INTERNAL, /* direct call to kdb_printf() */
 161         KDB_MSGSRC_PRINTK, /* trapped from printk() */
 162 };
 163
 164 extern int kdb_trap_printk;
 165 extern __printf(2, 0) int vkdb_printf(enum kdb_msgsrc src, const char *fmt,
 166                                       va_list args);
 167 extern __printf(1, 2) int kdb_printf(const char *, ...);
 168 typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);
 169
 170 extern void kdb_init(int level);
 171
 172 /* Access to kdb specific polling devices */
 173 typedef int (*get_char_func)(void);
 174 extern get_char_func kdb_poll_funcs[];
 175 extern int kdb_get_kbd_char(void);
 176
 177 static inline
 178 int kdb_process_cpu(const struct task_struct *p)
 179 {
 180         unsigned int cpu = task_thread_info(p)->cpu;
 181         if (cpu > num_possible_cpus())
 182                 cpu = 0;
 183         return cpu;
 184 }
 185
 186 /* kdb access to register set for stack dumping */
 187 extern struct pt_regs *kdb_current_regs;
 188 #ifdef CONFIG_KALLSYMS
 189 extern const char *kdb_walk_kallsyms(loff_t *pos);
 190 #else /* ! CONFIG_KALLSYMS */
 191 static inline const char *kdb_walk_kallsyms(loff_t *pos)
 192 {
 193         return NULL;
 194 }
 195 #endif /* ! CONFIG_KALLSYMS */
 196
 197 /* Dynamic kdb shell command registration */
 198 extern int kdb_register(char *, kdb_func_t, char *, char *, short);
 199 extern int kdb_register_flags(char *, kdb_func_t, char *, char *,
 200                               short, kdb_cmdflags_t);
 201 extern int kdb_unregister(char *);
 202 #else /* ! CONFIG_KGDB_KDB */
 203 static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }
 204 static inline void kdb_init(int level) {}
 205 static inline int kdb_register(char *cmd, kdb_func_t func, char *usage,
 206                                char *help, short minlen) { return 0; }
 207 static inline int kdb_register_flags(char *cmd, kdb_func_t func, char *usage,
 208                                      char *help, short minlen,
 209                                      kdb_cmdflags_t flags) { return 0; }
 210 static inline int kdb_unregister(char *cmd) { return 0; }
 211 #endif  /* CONFIG_KGDB_KDB */
 212 enum {
 213         KDB_NOT_INITIALIZED,
 214         KDB_INIT_EARLY,
 215         KDB_INIT_FULL,
 216 };
 217
 218 extern int kdbgetintenv(const char *, int *);
 219 extern int kdb_set(int, const char **);
 220
 221 #endif  /* !_KDB_H */