Fix get_saved_sp for 64bit address space. Simplify set_save_sp.

#ifdef CONFIG_32BIT

		mfc0	\temp, CP0_CONTEXT

		srl	\temp, 23

		LONG_S	\stackp, kernelsp(\temp)

#endif

#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)

		lw	\temp, TI_CPU(gp)

		dsll	\temp, 3

		lui	\temp2, %hi(kernelsp)

		daddu	\temp, \temp2

		LONG_S	\stackp, %lo(kernelsp)(\temp)

#endif

#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)

		MFC0	\temp, CP0_CONTEXT

		dsrl	\temp, 23

		LONG_S	\stackp, kernelsp(\temp)

#endif

		LONG_S	\stackp, kernelsp(\temp)

		.endm

#else

		.macro	get_saved_sp	/* Uniprocessor variation */

#if defined(CONFIG_64BIT) && defined(CONFIG_BUILD_ELF64)

		lui	k1, %highest(kernelsp)

		daddiu	k1, %higher(kernelsp)

		dsll	k1, k1, 16

		daddiu	k1, %hi(kernelsp)

		dsll	k1, k1, 16

#else

		lui	k1, %hi(kernelsp)

#endif

		LONG_L	k1, %lo(kernelsp)(k1)

		.endm