From 8d91c1e411f55d7ea91b1183a2e9f8088fb4d5be Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Tue, 15 Dec 2015 14:52:16 -0300 Subject: Linux-libre 4.3.2-gnu --- arch/arm64/lib/Makefile | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/arm64/lib/Makefile') diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index d98d3e398..1a811ecf7 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 -- cgit v1.2.3-54-g00ecf