kdb: Allow kernel loadable modules to add kdb shell functions

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>

1 files changed, 43 insertions, 0 deletions

diff --git a/include/linux/kdb.h b/include/linux/kdb.h
index ea6e5244ed3..deda197ced6 100644
--- a/include/linux/kdb.h
+++ b/include/linux/kdb.h
@@ -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,