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# SPDX-License-Identifier: GPL-2.0-only
PHONY := __default
__default: vmlinux.o
include include/config/auto.conf
include $(srctree)/scripts/Kbuild.include
# for objtool
include $(srctree)/scripts/Makefile.lib
# Generate a linker script to ensure correct ordering of initcalls for Clang LTO
# ---------------------------------------------------------------------------
quiet_cmd_gen_initcalls_lds = GEN $@
cmd_gen_initcalls_lds = \
$(PYTHON3) $(srctree)/scripts/jobserver-exec \
$(PERL) $(real-prereqs) > $@
.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \
vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
$(call if_changed,gen_initcalls_lds)
targets := .tmp_initcalls.lds
ifdef CONFIG_LTO_CLANG
initcalls-lds := .tmp_initcalls.lds
endif
# objtool for vmlinux.o
# ---------------------------------------------------------------------------
#
# For delay-objtool (IBT or LTO), objtool doesn't run on individual translation
# units. Instead it runs on vmlinux.o.
#
# For !delay-objtool + CONFIG_NOINSTR_VALIDATION, it runs on both translation
# units and vmlinux.o, with the latter only used for noinstr/unret validation.
objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
ifeq ($(delay-objtool),y)
vmlinux-objtool-args-y += $(objtool-args-y)
else
vmlinux-objtool-args-$(CONFIG_OBJTOOL_WERROR) += --werror
endif
vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \
$(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret)
objtool-args = $(vmlinux-objtool-args-y) --link
# Link of vmlinux.o used for section mismatch analysis
# ---------------------------------------------------------------------------
vmlinux-o-ld-args-$(CONFIG_BUILTIN_MODULE_RANGES) += -Map=$@.map
quiet_cmd_ld_vmlinux.o = LD $@
cmd_ld_vmlinux.o = \
$(LD) ${KBUILD_LDFLAGS} -r -o $@ \
$(vmlinux-o-ld-args-y) \
$(addprefix -T , $(initcalls-lds)) \
--whole-archive vmlinux.a --no-whole-archive \
--start-group $(KBUILD_VMLINUX_LIBS) --end-group \
$(cmd_objtool)
cmd_check_function_names = $(srctree)/scripts/check-function-names.sh $@
define rule_ld_vmlinux.o
$(call cmd_and_savecmd,ld_vmlinux.o)
$(call cmd,gen_objtooldep)
$(call cmd,check_function_names)
endef
vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE
$(call if_changed_rule,ld_vmlinux.o)
targets += vmlinux.o
# Add FORCE to the prerequisites of a target to force it to be always rebuilt.
# ---------------------------------------------------------------------------
PHONY += FORCE
FORCE:
# Read all saved command lines and dependencies for the $(targets) we
# may be building above, using $(if_changed{,_dep}). As an
# optimization, we don't need to read them if the target does not
# exist, we will rebuild anyway in that case.
existing-targets := $(wildcard $(sort $(targets)))
-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd)
.PHONY: $(PHONY)
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