| # | |
| # 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) |