1# SPDX-License-Identifier: GPL-2.0 2# Copyright 2022 Google LLC 3 4KBUILD_CFLAGS := $(subst $(CC_FLAGS_FTRACE),,$(KBUILD_CFLAGS)) -fpie \ 5 -Os -DDISABLE_BRANCH_PROFILING $(DISABLE_STACKLEAK_PLUGIN) \ 6 $(DISABLE_LATENT_ENTROPY_PLUGIN) \ 7 $(call cc-option,-mbranch-protection=none) \ 8 -I$(srctree)/scripts/dtc/libfdt -fno-stack-protector \ 9 -include $(srctree)/include/linux/hidden.h \ 10 -D__DISABLE_EXPORTS -ffreestanding -D__NO_FORTIFY \ 11 -fno-asynchronous-unwind-tables -fno-unwind-tables \ 12 $(call cc-option,-fno-addrsig) 13 14# this code may run with the MMU off so disable unaligned accesses 15CFLAGS_map_range.o += -mstrict-align 16 17# remove SCS flags from all objects in this directory 18KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) 19# disable LTO 20KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS)) 21 22hostprogs := relacheck 23 24quiet_cmd_piobjcopy = $(quiet_cmd_objcopy) 25 cmd_piobjcopy = $(cmd_objcopy) && $(obj)/relacheck $(@) $(<) 26 27$(obj)/%.pi.o: OBJCOPYFLAGS := --prefix-symbols=__pi_ \ 28 --remove-section=.note.gnu.property 29$(obj)/%.pi.o: $(obj)/%.o $(obj)/relacheck FORCE 30 $(call if_changed,piobjcopy) 31 32# ensure that all the lib- code ends up as __init code and data 33$(obj)/lib-%.pi.o: OBJCOPYFLAGS += --prefix-alloc-sections=.init 34 35$(obj)/lib-%.o: $(srctree)/lib/%.c FORCE 36 $(call if_changed_rule,cc_o_c) 37 38obj-y := idreg-override.pi.o \ 39 map_kernel.pi.o map_range.pi.o \ 40 lib-fdt.pi.o lib-fdt_ro.pi.o 41obj-$(CONFIG_RELOCATABLE) += relocate.pi.o 42obj-$(CONFIG_RANDOMIZE_BASE) += kaslr_early.pi.o 43obj-$(CONFIG_UNWIND_PATCH_PAC_INTO_SCS) += patch-scs.pi.o 44extra-y := $(patsubst %.pi.o,%.o,$(obj-y)) 45