Add commands for linux-kernel target

This patch implements a "lsmod", "struct" and, "offset" command to work with
the new linux-kernel target. The commands are a handy byproduct from
development and crude hacks. I don't expect them to be accepted in the
current state.  Nevertheless there needs to be an discussion on how and
where (see gdb/python scrips in kernel sources) to implement them. So here
is the start for it.

gdb/Changelog:

    * lk-cmds.h: New file.
    * lk-cmds.c: New file.
    * lk-low.c: Include lk-cmds.h.
    (lk_try_push_target): Init commands.
    * typeprint.c: Remove unnecessary forward declarations.
    (whatis_exp): Remove static.
    * typeprint.h (whatis_exp): New export.
    * Makefile.in (SFILES, ALLDEPFILES): Add lk-cmds.c.
    (HFILES_NO_SRCDIR): Add lk-cmds.h.
    (COMMON_OBS): Add lk-cmds.o.

1 files changed, 3 insertions, 0 deletions

diff --git a/gdb/lk-low.c b/gdb/lk-low.c
index 20206e9..4da7f21 100644
--- a/gdb/lk-low.c
+++ b/gdb/lk-low.c
@@ -27,6 +27,7 @@
 #include "gdbthread.h"
 #include "gdbtypes.h"
 #include "inferior.h"
+#include "lk-cmds.h"
 #include "lk-lists.h"
 #include "lk-low.h"
 #include "lk-modules.h"
@@ -825,6 +826,8 @@ lk_try_push_target ()
   if (!target_is_pushed (linux_kernel_ops))
     push_target (linux_kernel_ops);
 
+  lk_init_cmds ();
+
   set_solib_ops (gdbarch, lk_modules_so_ops);
 }