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.
7 cflags-$(CONFIG_X86_32) := -march=i386
8 cflags-$(CONFIG_X86_64) := -mcmodel=small
9 cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 \
10 -fPIC -fno-strict-aliasing -mno-red-zone \
11 -mno-mmx -mno-sse -DDISABLE_BRANCH_PROFILING
13 cflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS))
14 cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \
15 -fno-builtin -fpic -mno-single-pic-base
17 KBUILD_CFLAGS := $(cflags-y) \
18 $(call cc-option,-ffreestanding) \
19 $(call cc-option,-fno-stack-protector)
24 lib-y := efi-stub-helper.o
25 lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o
27 CFLAGS_fdt.o += -I$(srctree)/scripts/dtc/libfdt/
30 # arm64 puts the stub in the kernel proper, which will unnecessarily retain all
31 # code indefinitely unless it is annotated as __init/__initdata/__initconst etc.
32 # So let's apply the __init annotations at the section level, by prefixing
33 # the section names directly. This will ensure that even all the inline string
34 # literals are covered.
36 extra-$(CONFIG_ARM64) := $(lib-y)
37 lib-$(CONFIG_ARM64) := $(patsubst %.o,%.init.o,$(lib-y))
39 OBJCOPYFLAGS := --prefix-alloc-sections=.init
40 $(obj)/%.init.o: $(obj)/%.o FORCE
41 $(call if_changed,objcopy)