1# 2# The stub may be linked into the kernel proper or into a separate boot binary, 3# but in either case, it executes before the kernel does (with MMU disabled) so 4# things like ftrace and stack-protector are likely to cause trouble if left 5# enabled, even if doing so doesn't break the build. 6# 7cflags-$(CONFIG_X86_32) := -march=i386 8cflags-$(CONFIG_X86_64) := -mcmodel=small 9cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ 10 -fPIC -fno-strict-aliasing -mno-red-zone \ 11 -mno-mmx -mno-sse -DDISABLE_BRANCH_PROFILING 12 13cflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS)) 14cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \ 15 -fno-builtin -fpic -mno-single-pic-base 16 17KBUILD_CFLAGS := $(cflags-y) \ 18 $(call cc-option,-ffreestanding) \ 19 $(call cc-option,-fno-stack-protector) 20 21GCOV_PROFILE := n 22KASAN_SANITIZE := n 23 24lib-y := efi-stub-helper.o 25lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o 26 27CFLAGS_fdt.o += -I$(srctree)/scripts/dtc/libfdt/ 28 29# 30# arm64 puts the stub in the kernel proper, which will unnecessarily retain all 31# code indefinitely unless it is annotated as __init/__initdata/__initconst etc. 32# So let's apply the __init annotations at the section level, by prefixing 33# the section names directly. This will ensure that even all the inline string 34# literals are covered. 35# 36extra-$(CONFIG_ARM64) := $(lib-y) 37lib-$(CONFIG_ARM64) := $(patsubst %.o,%.init.o,$(lib-y)) 38 39OBJCOPYFLAGS := --prefix-alloc-sections=.init 40$(obj)/%.init.o: $(obj)/%.o FORCE 41 $(call if_changed,objcopy) 42