arch/arm64/lib/Makefile

   1 # SPDX-License-Identifier: GPL-2.0
   2 lib-y           := bitops.o clear_user.o delay.o copy_from_user.o       \
   3                    copy_to_user.o copy_in_user.o copy_page.o            \
   4                    clear_page.o memchr.o memcpy.o memmove.o memset.o    \
   5                    memcmp.o strcmp.o strncmp.o strlen.o strnlen.o       \
   6                    strchr.o strrchr.o
   7
   8 # Tell the compiler to treat all general purpose registers (with the
   9 # exception of the IP registers, which are already handled by the caller
  10 # in case of a PLT) as callee-saved, which allows for efficient runtime
  11 # patching of the bl instruction in the caller with an atomic instruction
  12 # when supported by the CPU. Result and argument registers are handled
  13 # correctly, based on the function prototype.
  14 lib-$(CONFIG_ARM64_LSE_ATOMICS) += atomic_ll_sc.o
  15 CFLAGS_atomic_ll_sc.o   := -fcall-used-x0 -ffixed-x1 -ffixed-x2         \
  16                    -ffixed-x3 -ffixed-x4 -ffixed-x5 -ffixed-x6          \
  17                    -ffixed-x7 -fcall-saved-x8 -fcall-saved-x9           \
  18                    -fcall-saved-x10 -fcall-saved-x11 -fcall-saved-x12   \
  19                    -fcall-saved-x13 -fcall-saved-x14 -fcall-saved-x15   \
  20                    -fcall-saved-x18
  21
  22 lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o