Commit c6f87713 authored by Sandeep Tripathy's avatar Sandeep Tripathy Committed by Carles Cufi
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arch: arm64: macro for mov immediate 



Single mov instruction can not be used to move non-zero
64b immediate value to the 64b register.
Implement macro to generate mov/ movk and movz sequences
depending on immediate value width.

Signed-off-by: default avatarSandeep Tripathy <sandeep.tripathy@broadcom.com>
parent b65bbd28

arch/arm/core/aarch64/macro.inc

+23 −0
Original line number Diff line number Diff line
@@ -8,6 +8,29 @@ 
#define _MACRO_H_



#ifdef _ASMLANGUAGE

/*

 * macro to support mov of immediate constant to 64 bit register

 * It will generate instruction sequence of 'mov'/ 'movz' and one

 * to three 'movk' depending on the immediate value.

 */

.macro mov_imm, xreg, imm

	.if ((\imm) == 0)

		mov	\xreg, \imm

	.else

		.if (((\imm) >> 31) == 0 || ((\imm) >> 31) == 0x1ffffffff)

			movz    \xreg, (\imm >> 16) & 0xffff, lsl 16

		.else

			.if (((\imm) >> 47) == 0 || ((\imm) >> 47) == 0x1ffff)

				movz    \xreg, (\imm >> 32) & 0xffff, lsl 32

			.else

				movz    \xreg, (\imm >> 48) & 0xffff, lsl 48

				movk    \xreg, (\imm >> 32) & 0xffff, lsl 32

			.endif

			movk    \xreg, (\imm >> 16) & 0xffff, lsl 16

		.endif

		movk    \xreg, (\imm) & 0xffff, lsl 0

	.endif

.endm



.macro	switch_el, xreg, el3_label, el2_label, el1_label

	mrs	\xreg, CurrentEL

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