sh: rework register restore code for sh3/sh4/sh4a
This patch reworks the sh3/sh4/sh4a register restore code in the following ways: - break out restore_regs() from restore_all() - the register saving order is unchanged - use restore_regs() in sh_bios_handler and restore_all - document the function Signed-off-by: NMagnus Damm <damm@igel.co.jp> Signed-off-by: NPaul Mundt <lethal@linux-sh.org>
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