* infcmd.c (step_1), infrun.c (wait_for_inferior): Add comments

	* infcmd.c (step_1), infrun.c (wait_for_inferior): Add comments
	about SHIFT_INST_REGS.

	* exec.c (exec_file_command): Set text_end based on all code readonly
	sections, not just ".text".

	* defs.h, infcmd.c, config/z8k/tm-z8k.h, config/m88k/tm-m88k.h,
	config/sh/tm-sh.h, config/h8300/tm-h8300.h, config/h8500/tm-h8500.h,
	z8k-tdep.c: Remove all references to ADDR_BITS_SET.
	* config/m88k/tm-m88k.h: Define TARGET_WRITE_PC.

	* config/m88k/tm-m88k.h: Add definitions for calling functions.