* gdbarch.sh (displaced_step_hw_singlestep): New callback.

	* gdbarch.sh (displaced_step_hw_singlestep): New callback.
	* gdbarch.c, gdbarch.h: Regenerate.
	* arch-utils.c (default_displaced_step_hw_singlestep): New function.
	* arch-utils.h (default_displaced_step_hw_singlestep): Add prototype.

	* ppc-linux-tdep.c (ppc_displaced_step_hw_singlestep): New function.
	(rs6000_gdbarch_init): Install it.

	* infrun.c (displaced_step_fixup): Use new callback to determine
	whether to "step" or "continue" displaced copy.
	(resume): Likewise.  Do not call maybe_software_singlestep
	for displaced stepping.
	(maybe_software_singlestep): Do not handle displaced stepping.