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- #
- # The stub may be linked into the kernel proper or into a separate boot binary,
- # but in either case, it executes before the kernel does (with MMU disabled) so
- # things like ftrace and stack-protector are likely to cause trouble if left
- # enabled, even if doing so doesn't break the build.
- #
- cflags-$(CONFIG_X86_32) := -march=i386
- cflags-$(CONFIG_X86_64) := -mcmodel=small
- cflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 \
- -fPIC -fno-strict-aliasing -mno-red-zone \
- -mno-mmx -mno-sse -DDISABLE_BRANCH_PROFILING
- cflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS))
- cflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \
- -fno-builtin -fpic -mno-single-pic-base
- KBUILD_CFLAGS := $(cflags-y) \
- $(call cc-option,-ffreestanding) \
- $(call cc-option,-fno-stack-protector)
- GCOV_PROFILE := n
- KASAN_SANITIZE := n
- lib-y := efi-stub-helper.o
- lib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o
- CFLAGS_fdt.o += -I$(srctree)/scripts/dtc/libfdt/
- #
- # arm64 puts the stub in the kernel proper, which will unnecessarily retain all
- # code indefinitely unless it is annotated as __init/__initdata/__initconst etc.
- # So let's apply the __init annotations at the section level, by prefixing
- # the section names directly. This will ensure that even all the inline string
- # literals are covered.
- #
- extra-$(CONFIG_ARM64) := $(lib-y)
- lib-$(CONFIG_ARM64) := $(patsubst %.o,%.init.o,$(lib-y))
- OBJCOPYFLAGS := --prefix-alloc-sections=.init
- $(obj)/%.init.o: $(obj)/%.o FORCE
- $(call if_changed,objcopy)
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