diff options
Diffstat (limited to 'arch/arm64/lib')
| -rw-r--r-- | arch/arm64/lib/Makefile | 13 | ||||
| -rw-r--r-- | arch/arm64/lib/atomic_ll_sc.c | 3 |
2 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index d98d3e3..1a811ec 100644 --- a/arch/arm64/lib/Makefile +++ b/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 diff --git a/arch/arm64/lib/atomic_ll_sc.c b/arch/arm64/lib/atomic_ll_sc.c new file mode 100644 index 0000000..b0c538b --- /dev/null +++ b/arch/arm64/lib/atomic_ll_sc.c @@ -0,0 +1,3 @@ +#include <asm/atomic.h> +#define __ARM64_IN_ATOMIC_IMPL +#include <asm/atomic_ll_sc.h> |
