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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-04-18 17:09:44 +0200
committerWill Deacon <will.deacon@arm.com>2016-04-26 12:22:59 +0100
commit30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f (patch)
tree4a812bfdf836f1f8e59e7f8d4c67ef7a52f2758b /arch/arm64/include/asm
parent0cd3defe0af4153ffc5fe39bcfa4abfc301984e9 (diff)
downloadlinux-30b5ba5cf333cc650e474eaf2cc1ae91bc7cf89f.tar.gz
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) Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/include/asm')
-rw-r--r--arch/arm64/include/asm/assembler.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index 972fb55af9f1..f9b6f7af75ac 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -221,4 +221,24 @@ 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 */