2011-03-08 Maxim Grigoriev <maxim2405@gmail.com>

2011-03-08  Maxim Grigoriev  <maxim2405@gmail.com>

	* xtensa-tdep.c (xtensa_read_register): New function.
	(xtensa_write_register): New function.
	(xtensa_find_register_by_name): New function.
	(xtensa_windowed_frame_cache): Update comments in type description.
	(xtensa_frame_cache): Likewise.
	(xtensa_window_interrupt_insn): New function.
	(xtensa_frame_cache): Add analysis for Xtensa Window Exception frames.
	(xtensa_insn_kind): Add new instructions.
	(rwx_special_register): New function.
	(call0_classify_opcode): Add new instructions to the analysis.
	(a0_saved, a7_saved, a11_saved): New variables.
	(a0_was_saved, a7_was_saved, a11_was_saved): New variables.
	(execute_l32e): New function.
	(execute_s32e): New function.
	(xtensa_exception_handler_t): New type.
	(execute_code): New function.
	(xtensa_window_interrupt_frame_cache): New function to conduct frame
	analysis for Xtensa Window Exception handlers.