The attached patch fixes three debugging problems in the frv arch:

 (1) Single-stepping in userspace steps through into the kernel-mode interrupt
     handler when a hardware interrupt happens, and sometimes it gets past
     where the debug-mode handler would normally catch it. This patch extends
     the range of detected PC values.

 (2) When setting up the kernel-mode exception frame from the debug-mode
     handler for a userspace debugging event, we weren't setting the LR
     register to generate a return to the exception handler epilogue.

 (3) sys_ptrace() now needs to "put" the inferior task_struct not "free" it as
     was done in 2.4.
Signed-Off-By: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>