Release 4.7 include/linux/kdb.h

#ifndef _KDB_H

#define _KDB_H

/*
 * Kernel Debugger Architecture Independent Global Headers
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (c) 2000-2007 Silicon Graphics, Inc.  All Rights Reserved.
 * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
 * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
 */

/* Shifted versions of the command enable bits are be used if the command
 * has no arguments (see kdb_check_flags). This allows commands, such as
 * go, to have different permissions depending upon whether it is called
 * with an argument.
 */

#define KDB_ENABLE_NO_ARGS_SHIFT 10

typedef enum {
	
KDB_ENABLE_ALL = (1 << 0), /* Enable everything */
	
KDB_ENABLE_MEM_READ = (1 << 1),
	
KDB_ENABLE_MEM_WRITE = (1 << 2),
	
KDB_ENABLE_REG_READ = (1 << 3),
	
KDB_ENABLE_REG_WRITE = (1 << 4),
	
KDB_ENABLE_INSPECT = (1 << 5),
	
KDB_ENABLE_FLOW_CTRL = (1 << 6),
	
KDB_ENABLE_SIGNAL = (1 << 7),
	
KDB_ENABLE_REBOOT = (1 << 8),
	/* User exposed values stop here, all remaining flags are
         * exclusively used to describe a commands behaviour.
         */

	
KDB_ENABLE_ALWAYS_SAFE = (1 << 9),
	
KDB_ENABLE_MASK = (1 << KDB_ENABLE_NO_ARGS_SHIFT) - 1,

	
KDB_ENABLE_ALL_NO_ARGS = KDB_ENABLE_ALL << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_MEM_READ_NO_ARGS = KDB_ENABLE_MEM_READ
				      << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_MEM_WRITE_NO_ARGS = KDB_ENABLE_MEM_WRITE
				       << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_REG_READ_NO_ARGS = KDB_ENABLE_REG_READ
				      << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_REG_WRITE_NO_ARGS = KDB_ENABLE_REG_WRITE
				       << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_INSPECT_NO_ARGS = KDB_ENABLE_INSPECT
				     << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_FLOW_CTRL_NO_ARGS = KDB_ENABLE_FLOW_CTRL
				       << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_SIGNAL_NO_ARGS = KDB_ENABLE_SIGNAL
				    << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_REBOOT_NO_ARGS = KDB_ENABLE_REBOOT
				    << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_ALWAYS_SAFE_NO_ARGS = KDB_ENABLE_ALWAYS_SAFE
					 << KDB_ENABLE_NO_ARGS_SHIFT,
	
KDB_ENABLE_MASK_NO_ARGS = KDB_ENABLE_MASK << KDB_ENABLE_NO_ARGS_SHIFT,

	
KDB_REPEAT_NO_ARGS = 0x40000000, /* Repeat the command w/o arguments */
	
KDB_REPEAT_WITH_ARGS = 0x80000000, /* Repeat the command with args */
} 
kdb_cmdflags_t;


typedef int (*kdb_func_t)(int, const char **);

#ifdef	CONFIG_KGDB_KDB
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/atomic.h>


#define KDB_POLL_FUNC_MAX	5
extern int kdb_poll_idx;

/*
 * kdb_initial_cpu is initialized to -1, and is set to the cpu
 * number whenever the kernel debugger is entered.
 */
extern int kdb_initial_cpu;
extern atomic_t kdb_event;

/* Types and messages used for dynamically added kdb shell commands */


#define KDB_MAXARGS    16 
/* Maximum number of arguments to a function  */

/* KDB return codes from a command or internal kdb function */

#define KDB_NOTFOUND	(-1)

#define KDB_ARGCOUNT	(-2)

#define KDB_BADWIDTH	(-3)

#define KDB_BADRADIX	(-4)

#define KDB_NOTENV	(-5)

#define KDB_NOENVVALUE	(-6)

#define KDB_NOTIMP	(-7)

#define KDB_ENVFULL	(-8)

#define KDB_ENVBUFFULL	(-9)

#define KDB_TOOMANYBPT	(-10)

#define KDB_TOOMANYDBREGS (-11)

#define KDB_DUPBPT	(-12)

#define KDB_BPTNOTFOUND	(-13)

#define KDB_BADMODE	(-14)

#define KDB_BADINT	(-15)

#define KDB_INVADDRFMT  (-16)

#define KDB_BADREG      (-17)

#define KDB_BADCPUNUM   (-18)

#define KDB_BADLENGTH	(-19)

#define KDB_NOBP	(-20)

#define KDB_BADADDR	(-21)

#define KDB_NOPERM	(-22)

/*
 * kdb_diemsg
 *
 *      Contains a pointer to the last string supplied to the
 *      kernel 'die' panic function.
 */
extern const char *kdb_diemsg;


#define KDB_FLAG_EARLYKDB	(1 << 0) 
/* set from boot parameter kdb=early */

#define KDB_FLAG_CATASTROPHIC	(1 << 1) 
/* A catastrophic event has occurred */

#define KDB_FLAG_CMD_INTERRUPT	(1 << 2) 
/* Previous command was interrupted */

#define KDB_FLAG_NOIPI		(1 << 3) 
/* Do not send IPIs */

#define KDB_FLAG_NO_CONSOLE	(1 << 5) 
/* No console is available,
                                          * kdb is disabled */

#define KDB_FLAG_NO_VT_CONSOLE	(1 << 6) 
/* No VT console is available, do
                                          * not use keyboard */

#define KDB_FLAG_NO_I8042	(1 << 7) 
/* No i8042 chip is available, do
                                          * not use keyboard */

extern int kdb_flags;	/* Global flags, see kdb_state for per cpu state */

extern void kdb_save_flags(void);
extern void kdb_restore_flags(void);


#define KDB_FLAG(flag)		(kdb_flags & KDB_FLAG_##flag)

#define KDB_FLAG_SET(flag)	((void)(kdb_flags |= KDB_FLAG_##flag))

#define KDB_FLAG_CLEAR(flag)	((void)(kdb_flags &= ~KDB_FLAG_##flag))

/*
 * External entry point for the kernel debugger.  The pt_regs
 * at the time of entry are supplied along with the reason for
 * entry to the kernel debugger.
 */

typedef enum {
	
KDB_REASON_ENTER = 1,	/* KDB_ENTER() trap/fault - regs valid */
	
KDB_REASON_ENTER_SLAVE,	/* KDB_ENTER_SLAVE() trap/fault - regs valid */
	
KDB_REASON_BREAK,	/* Breakpoint inst. - regs valid */
	
KDB_REASON_DEBUG,	/* Debug Fault - regs valid */
	
KDB_REASON_OOPS,	/* Kernel Oops - regs valid */
	
KDB_REASON_SWITCH,	/* CPU switch - regs valid*/
	
KDB_REASON_KEYBOARD,	/* Keyboard entry - regs valid */
	
KDB_REASON_NMI,		/* Non-maskable interrupt; regs valid */
	
KDB_REASON_RECURSE,	/* Recursive entry to kdb;
                                 * regs probably valid */
	
KDB_REASON_SSTEP,	/* Single Step trap. - regs valid */
	
KDB_REASON_SYSTEM_NMI,	/* In NMI due to SYSTEM cmd; regs valid */
} 
kdb_reason_t;


enum kdb_msgsrc {
	
KDB_MSGSRC_INTERNAL, /* direct call to kdb_printf() */
	
KDB_MSGSRC_PRINTK, /* trapped from printk() */
};

extern int kdb_trap_printk;
extern __printf(2, 0) int vkdb_printf(enum kdb_msgsrc src, const char *fmt,
				      va_list args);
extern __printf(1, 2) int kdb_printf(const char *, ...);

typedef __printf(1, 2) int (*kdb_printf_t)(const char *, ...);

extern void kdb_init(int level);

/* Access to kdb specific polling devices */

typedef int (*get_char_func)(void);
extern get_char_func kdb_poll_funcs[];
extern int kdb_get_kbd_char(void);


static inline

int kdb_process_cpu(const struct task_struct *p)
{
	unsigned int cpu = task_thread_info(p)->cpu;
	if (cpu > num_possible_cpus())
		cpu = 0;
	return cpu;
}

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/* kdb access to register set for stack dumping */
extern struct pt_regs *kdb_current_regs;
#ifdef CONFIG_KALLSYMS
extern const char *kdb_walk_kallsyms(loff_t *pos);
#else /* ! CONFIG_KALLSYMS */


static inline const char *kdb_walk_kallsyms(loff_t *pos)
{
	return NULL;
}
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#endif /* ! CONFIG_KALLSYMS */

/* Dynamic kdb shell command registration */
extern int kdb_register(char *, kdb_func_t, char *, char *, short);
extern int kdb_register_flags(char *, kdb_func_t, char *, char *,
			      short, kdb_cmdflags_t);
extern int kdb_unregister(char *);
#else /* ! CONFIG_KGDB_KDB */

static inline __printf(1, 2) int kdb_printf(const char *fmt, ...) { return 0; }


static inline void kdb_init(int level) {}
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static inline int kdb_register(char *cmd, kdb_func_t func, char *usage,
			       char *help, short minlen) { return 0; }
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static inline int kdb_register_flags(char *cmd, kdb_func_t func, char *usage,
				     char *help, short minlen,
				     kdb_cmdflags_t flags) { return 0; }
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static inline int kdb_unregister(char *cmd) { return 0; }
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#endif	/* CONFIG_KGDB_KDB */
enum {
	
KDB_NOT_INITIALIZED,
	
KDB_INIT_EARLY,
	
KDB_INIT_FULL,
};

extern int kdbgetintenv(const char *, int *);
extern int kdb_set(int, const char **);

#endif	/* !_KDB_H */
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Directory: include/linux

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