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Date: Mon, 18 Apr 2016 17:09:44 +0200 From: Ard Biesheuvel <ard.biesheuvel@...aro.org> To: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, will.deacon@....com, mark.rutland@....com, james.morse@....com Cc: catalin.marinas@....com, Ard Biesheuvel <ard.biesheuvel@...aro.org> Subject: [PATCH 4/8] arm64: introduce mov_q macro to move a constant into a 64-bit register Implement a macro mov_q that can be used to move an immediate constant into a 64-bit register, using between 2 and 4 movz/movk instructions (depending on the operand) Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org> --- arch/arm64/include/asm/assembler.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 70f7b9e04598..9ea846ded55c 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -233,4 +233,24 @@ lr .req x30 // link register .long \sym\()_hi32 .endm + /* + * mov_q - move an immediate constant into a 64-bit register using + * between 2 and 4 movz/movk instructions (depending on the + * magnitude and sign of the operand) + */ + .macro mov_q, reg, val + .if (((\val) >> 31) == 0 || ((\val) >> 31) == 0x1ffffffff) + movz \reg, :abs_g1_s:\val + .else + .if (((\val) >> 47) == 0 || ((\val) >> 47) == 0x1ffff) + movz \reg, :abs_g2_s:\val + .else + movz \reg, :abs_g3:\val + movk \reg, :abs_g2_nc:\val + .endif + movk \reg, :abs_g1_nc:\val + .endif + movk \reg, :abs_g0_nc:\val + .endm + #endif /* __ASM_ASSEMBLER_H */ -- 2.5.0
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