linux/arch/arm64/lib/Makefile

lib-y		:= bitops.o clear_user.o delay.o copy_from_user.o	\
		   copy_to_user.o copy_in_user.o copy_page.o		\
		   clear_page.o memchr.o memcpy.o memmove.o memset.o	\
		   memcmp.o strcmp.o strncmp.o strlen.o strnlen.o	\
		   strchr.o strrchr.o

# Tell the compiler to treat all general purpose registers as
# callee-saved, which allows for efficient runtime patching of the bl
# instruction in the caller with an atomic instruction when supported by
# the CPU. Result and argument registers are handled correctly, based on
# the function prototype.
lib-$(CONFIG_ARM64_LSE_ATOMICS) += atomic_ll_sc.o
CFLAGS_atomic_ll_sc.o	:= -fcall-used-x0 -ffixed-x1 -ffixed-x2		\
		   -ffixed-x3 -ffixed-x4 -ffixed-x5 -ffixed-x6		\
		   -ffixed-x7 -fcall-saved-x8 -fcall-saved-x9		\
		   -fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12	\
		   -fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15	\
		   -fcall-saved-x16 -fcall-saved-x17 -fcall-saved-x18
arm64: use generic strnlen_user and strncpy_from_user functions This patch implements the word-at-a-time interface for arm64 using the same algorithm as ARM. We use the fls64 macro, which expands to a clz instruction via a compiler builtin. Big-endian configurations make use of the implementation from asm-generic. With this implemented, we can replace our byte-at-a-time strnlen_user and strncpy_from_user functions with the optimised generic versions. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2013-11-07 01:20:22 +08:00			`lib-y := bitops.o clear_user.o delay.o copy_from_user.o \`
			`copy_to_user.o copy_in_user.o copy_page.o \`
			`clear_page.o memchr.o memcpy.o memmove.o memset.o \`
arm64: lib: Implement optimized string length routines This patch, based on Linaro's Cortex Strings library, adds an assembly optimized strlen() and strnlen() functions. Signed-off-by: Zhichang Yuan <zhichang.yuan@linaro.org> Signed-off-by: Deepak Saxena <dsaxena@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2014-04-28 13:11:34 +08:00			`memcmp.o strcmp.o strncmp.o strlen.o strnlen.o \`
			`strchr.o strrchr.o`
arm64: introduce CONFIG_ARM64_LSE_ATOMICS as fallback to ll/sc atomics In order to patch in the new atomic instructions at runtime, we need to generate wrappers around the out-of-line exclusive load/store atomics. This patch adds a new Kconfig option, CONFIG_ARM64_LSE_ATOMICS. which causes our atomic functions to branch to the out-of-line ll/sc implementations. To avoid the register spill overhead of the PCS, the out-of-line functions are compiled with specific compiler flags to force out-of-line save/restore of any registers that are usually caller-saved. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com> 2015-02-03 20:39:03 +08:00
			`# Tell the compiler to treat all general purpose registers as`
			`# callee-saved, which allows for efficient runtime patching of the bl`
			`# instruction in the caller with an atomic instruction when supported by`
			`# the CPU. Result and argument registers are handled correctly, based on`
			`# the function prototype.`
			`lib-$(CONFIG_ARM64_LSE_ATOMICS) += atomic_ll_sc.o`
			`CFLAGS_atomic_ll_sc.o := -fcall-used-x0 -ffixed-x1 -ffixed-x2 \`
			`-ffixed-x3 -ffixed-x4 -ffixed-x5 -ffixed-x6 \`
			`-ffixed-x7 -fcall-saved-x8 -fcall-saved-x9 \`
			`-fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12 \`
			`-fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15 \`
			`-fcall-saved-x16 -fcall-saved-x17 -fcall-saved-x18`