* cris/traps.c (abort): Define to call sim_io_error.

	(create_map): Make -1 imply a non-fixed address, not 0.  All
	callers changed.  Only prefer the next higher unmapped address if
	the last mapped address is no less than 0x40000000.  Check that
	the address to be mapped is not already mapped.  Update head
	comment.
	(unmap_pages): Don't call abort when recursive call fails, just
	note and return an error if a page in the range couldn't be unmapped.
	(cris_bmod_handler, h_supr_set_handler, h_supr_get_handler)
	(schedule, make_first_thread, cris_pipe_empty): New local variable sd.
	(cris_break_13_handler) <case TARGET_SYS_mmap2>: Handle
	non-MAP_FIXED argument overlapping existing map.  For MAP_FIXED,
	don't abort on page not being mapped.  Handle non-anon filemap
	with length padded to pagesize.