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)
Cc: stable@vger.kernel.org # v4.4 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 Signed-off-by: Suzuki K Poulose suzuki.poulose@arm.com --- Cherry picked for backport of "commit ece1397cbc89c51914fae1aec729539cfd8bd62b upstream" --- 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 12eff92..83e2309 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 */