2009-06-16 Tristan Gingold <gingold@adacore.com>

2009-06-16  Tristan Gingold  <gingold@adacore.com>

	* avr-tdep.c (struct gdbarch_tdep): Replace the unused field with
	call_length field.
	(avr_register_name): Add const to register_names.
	(avr_scan_arg_moves): Move inside avr_scan_prologue.
	(avr_scan_prologue): Add pc_end argument.
	Only read prologue bytes that can be read.
	Limit the scan to the known prologue length.
	Makes pattern variables static and const.
	Fix indentation.
	(avr_skip_prologue): Pass func_end argument to avr_scan_prologue.
	Fix indentation.
	(avr_breakpoint_from_pc): Constify avr_break_insn.
	(avr_extract_return_value): Fix function comment.
	(avr_frame_unwind_cache): Fix GNU style violations.
	Pass current_pc argument to avr_scan_prologue to stop prologue
	analysis to the current pc.  This fixes the bug with the 'next'
	command.
	Correctly set the SP register of the previous frame (use call_length).
	(avr_frame_prev_register): Fix indentation.
	Correctly read PC from the stack on avr6 architectures.
	(avr_push_dummy_call): Fix indentation.
	(avr_gdbarch_init): Set call_length according to the architecture.