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-rw-r--r--kernel/arch/arm64/lib/Makefile13
1 files changed, 13 insertions, 0 deletions
diff --git a/kernel/arch/arm64/lib/Makefile b/kernel/arch/arm64/lib/Makefile
index d98d3e398..1a811ecf7 100644
--- a/kernel/arch/arm64/lib/Makefile
+++ b/kernel/arch/arm64/lib/Makefile
@@ -3,3 +3,16 @@ lib-y := bitops.o clear_user.o delay.o copy_from_user.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