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kdb: Allow kernel loadable modules to add kdb shell functions

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In order to allow kernel modules to dynamically add a command to the
kdb shell the kdb_register, kdb_register_repeat, kdb_unregister, and
kdb_printf need to be exported as GPL symbols.

Any kernel module that adds a dynamic kdb shell function should only
need to include linux/kdb.h.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
This commit is contained in:
Jason Wessel 2010-10-11 10:20:14 -05:00
parent fb70b5888b
commit f7030bbc44
4 changed files with 48 additions and 40 deletions
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43
include/linux/kdb.h
View file

@ -28,6 +28,41 @@ extern int kdb_poll_idx;
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 */
typedef enum {
KDB_REPEAT_NONE = 0, /* Do not repeat this command */
KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */
KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */
} kdb_repeat_t;
typedef int (*kdb_func_t)(int, const char **);
/* 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)
/*
* kdb_diemsg
*
@ -105,9 +140,17 @@ int kdb_process_cpu(const struct task_struct *p)
/* kdb access to register set for stack dumping */
extern struct pt_regs *kdb_current_regs;
/* Dynamic kdb shell command registration */
extern int kdb_register(char *, kdb_func_t, char *, char *, short);
extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
short, kdb_repeat_t);
extern int kdb_unregister(char *);
#else /* ! CONFIG_KGDB_KDB */
#define kdb_printf(...)
#define kdb_init(x)
#define kdb_register(...)
#define kdb_register_repeat(...)
#define kdb_uregister(x)
#endif /* CONFIG_KGDB_KDB */
enum {
KDB_NOT_INITIALIZED,

2
kernel/debug/kdb/kdb_io.c
View file

@ -823,4 +823,4 @@ int kdb_printf(const char *fmt, ...)
return r;
}
EXPORT_SYMBOL_GPL(kdb_printf);

4
kernel/debug/kdb/kdb_main.c
View file

@ -2783,6 +2783,8 @@ int kdb_register_repeat(char *cmd,
return 0;
}
EXPORT_SYMBOL_GPL(kdb_register_repeat);
/*
* kdb_register - Compatibility register function for commands that do
@ -2805,6 +2807,7 @@ int kdb_register(char *cmd,
return kdb_register_repeat(cmd, func, usage, help, minlen,
KDB_REPEAT_NONE);
}
EXPORT_SYMBOL_GPL(kdb_register);
/*
* kdb_unregister - This function is used to unregister a kernel
@ -2833,6 +2836,7 @@ int kdb_unregister(char *cmd)
/* Couldn't find it. */
return 1;
}
EXPORT_SYMBOL_GPL(kdb_unregister);
/* Initialize the kdb command table. */
static void __init kdb_inittab(void)

39
kernel/debug/kdb/kdb_private.h
View file

@ -15,29 +15,6 @@
#include <linux/kgdb.h>
#include "../debug_core.h"
/* Kernel Debugger Error codes. Must not overlap with command codes. */
#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)
/* Kernel Debugger Command codes. Must not overlap with error codes. */
#define KDB_CMD_GO (-1001)
#define KDB_CMD_CPU (-1002)
@ -93,17 +70,6 @@
*/
#define KDB_MAXBPT 16
/* Maximum number of arguments to a function */
#define KDB_MAXARGS 16
typedef enum {
KDB_REPEAT_NONE = 0, /* Do not repeat this command */
KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */
KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */
} kdb_repeat_t;
typedef int (*kdb_func_t)(int, const char **);
/* Symbol table format returned by kallsyms. */
typedef struct __ksymtab {
unsigned long value; /* Address of symbol */
@ -123,11 +89,6 @@ extern int kallsyms_symbol_next(char *prefix_name, int flag);
extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
/* Exported Symbols for kernel loadable modules to use. */
extern int kdb_register(char *, kdb_func_t, char *, char *, short);
extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
short, kdb_repeat_t);
extern int kdb_unregister(char *);
extern int kdb_getarea_size(void *, unsigned long, size_t);
extern int kdb_putarea_size(unsigned long, void *, size_t);