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
27#
28# arm64 puts the stub in the kernel proper, which will unnecessarily retain all
29# code indefinitely unless it is annotated as __init/__initdata/__initconst etc.
30# So let's apply the __init annotations at the section level, by prefixing
31# the section names directly. This will ensure that even all the inline string
32# literals are covered.
33#
34extra-$(CONFIG_ARM64)		:= $(lib-y)
35lib-$(CONFIG_ARM64)		:= $(patsubst %.o,%.init.o,$(lib-y))
36
37OBJCOPYFLAGS := --prefix-alloc-sections=.init
38$(obj)/%.init.o: $(obj)/%.o FORCE
39	$(call if_changed,objcopy)
40