1f4f75ad5SArd Biesheuvel# 2f4f75ad5SArd Biesheuvel# The stub may be linked into the kernel proper or into a separate boot binary, 3f4f75ad5SArd Biesheuvel# but in either case, it executes before the kernel does (with MMU disabled) so 4f4f75ad5SArd Biesheuvel# things like ftrace and stack-protector are likely to cause trouble if left 5f4f75ad5SArd Biesheuvel# enabled, even if doing so doesn't break the build. 6f4f75ad5SArd Biesheuvel# 7f4f75ad5SArd Biesheuvelcflags-$(CONFIG_X86_32) := -march=i386 8f4f75ad5SArd Biesheuvelcflags-$(CONFIG_X86_64) := -mcmodel=small 9f4f75ad5SArd Biesheuvelcflags-$(CONFIG_X86) += -m$(BITS) -D__KERNEL__ $(LINUX_INCLUDE) -O2 \ 10f4f75ad5SArd Biesheuvel -fPIC -fno-strict-aliasing -mno-red-zone \ 11f4f75ad5SArd Biesheuvel -mno-mmx -mno-sse -DDISABLE_BRANCH_PROFILING 12f4f75ad5SArd Biesheuvel 13f4f75ad5SArd Biesheuvelcflags-$(CONFIG_ARM64) := $(subst -pg,,$(KBUILD_CFLAGS)) 14f4f75ad5SArd Biesheuvelcflags-$(CONFIG_ARM) := $(subst -pg,,$(KBUILD_CFLAGS)) \ 15f4f75ad5SArd Biesheuvel -fno-builtin -fpic -mno-single-pic-base 16f4f75ad5SArd Biesheuvel 17f4f75ad5SArd BiesheuvelKBUILD_CFLAGS := $(cflags-y) \ 18f4f75ad5SArd Biesheuvel $(call cc-option,-ffreestanding) \ 19f4f75ad5SArd Biesheuvel $(call cc-option,-fno-stack-protector) 20f4f75ad5SArd Biesheuvel 21f4f75ad5SArd BiesheuvelGCOV_PROFILE := n 22f4f75ad5SArd Biesheuvel 23f4f75ad5SArd Biesheuvellib-y := efi-stub-helper.o 24f4f75ad5SArd Biesheuvellib-$(CONFIG_EFI_ARMSTUB) += arm-stub.o fdt.o 25f4f75ad5SArd Biesheuvel 26f4f75ad5SArd BiesheuvelCFLAGS_fdt.o += -I$(srctree)/scripts/dtc/libfdt/ 27*ddeeefe2SArd Biesheuvel 28*ddeeefe2SArd Biesheuvel# 29*ddeeefe2SArd Biesheuvel# arm64 puts the stub in the kernel proper, which will unnecessarily retain all 30*ddeeefe2SArd Biesheuvel# code indefinitely unless it is annotated as __init/__initdata/__initconst etc. 31*ddeeefe2SArd Biesheuvel# So let's apply the __init annotations at the section level, by prefixing 32*ddeeefe2SArd Biesheuvel# the section names directly. This will ensure that even all the inline string 33*ddeeefe2SArd Biesheuvel# literals are covered. 34*ddeeefe2SArd Biesheuvel# 35*ddeeefe2SArd Biesheuvelextra-$(CONFIG_ARM64) := $(lib-y) 36*ddeeefe2SArd Biesheuvellib-$(CONFIG_ARM64) := $(patsubst %.o,%.init.o,$(lib-y)) 37*ddeeefe2SArd Biesheuvel 38*ddeeefe2SArd BiesheuvelOBJCOPYFLAGS := --prefix-alloc-sections=.init 39*ddeeefe2SArd Biesheuvel$(obj)/%.init.o: $(obj)/%.o FORCE 40*ddeeefe2SArd Biesheuvel $(call if_changed,objcopy) 41