2006-05-02 Michael Snyder <msnyder@redhat.com>

2006-05-02  Michael Snyder  <msnyder@redhat.com>

	* Target interface for reverse execution.
	* target.h (enum target_waitkind):
	Add new wait event, TARGET_WAITKIND_NO_HISTORY.
	(enum exec_direction_kind): New enum.
	(struct target_ops): New methods to_set_execdir, to_get_execdir.
	* target.c (target_get_execdir): New generic method.
	(target_set_execdir): Ditto.
	* remote.c (remote_get_execdir, remote_set_execdir): New methods.
	(remote_vcont_resume): Jump out if attempting reverse execution.
	(remote_resume): Check for reverse exec direction, and send
	appropriate command to target.
	(remote_wait): Check target response for NO_HISTORY status.
	Also check for empty reply (target doesn't understand "bs" or "bc).
	(_initialize_remote): Add new methods to remote target vector.