From 45eecfb9c5f5bc2f7c254c8bcc4219fa4b31008c Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Mon, 18 Apr 2016 17:09:44 +0200 Subject: arm64: introduce mov_q macro to move a constant into a 64-bit register commit 30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f upstream. 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) Acked-by: Catalin Marinas Signed-off-by: Ard Biesheuvel Signed-off-by: Will Deacon Signed-off-by: Suzuki K Poulose Signed-off-by: Greg Kroah-Hartman --- arch/arm64/include/asm/assembler.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'arch/arm64') diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h index 12eff928ef8b..83e23093dfd8 100644 --- a/arch/arm64/include/asm/assembler.h +++ b/arch/arm64/include/asm/assembler.h @@ -204,4 +204,24 @@ lr .req x30 // link register .size __pi_##x, . - x; \ ENDPROC(x) + /* + * 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 */ -- cgit v1.2.3