name : Makefile.vmlinux_o # SPDX-License-Identifier: GPL-2.0-only PHONY := __default __default: vmlinux.o modules.builtin.modinfo modules.builtin 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 LTO and IBT, objtool doesn't run on individual translation units. # Run everything on vmlinux instead. objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION)) vmlinux-objtool-args-$(delay-objtool) += $(objtool-args-y) vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \ $(if $(or $(CONFIG_CPU_UNRET_ENTRY),$(CONFIG_CPU_SRSO)), --unret) objtool-args = $(vmlinux-objtool-args-y) --link # Link of vmlinux.o used for section mismatch analysis # --------------------------------------------------------------------------- quiet_cmd_ld_vmlinux.o = LD $@ cmd_ld_vmlinux.o = \ $(LD) ${KBUILD_LDFLAGS} -r -o $@ \ $(addprefix -T , $(initcalls-lds)) \ --whole-archive vmlinux.a --no-whole-archive \ --start-group $(KBUILD_VMLINUX_LIBS) --end-group \ $(cmd_objtool) define rule_ld_vmlinux.o $(call cmd_and_savecmd,ld_vmlinux.o) $(call cmd,gen_objtooldep) endef vmlinux.o: $(initcalls-lds) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE $(call if_changed_rule,ld_vmlinux.o) targets += vmlinux.o # module.builtin.modinfo # --------------------------------------------------------------------------- OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary targets += modules.builtin.modinfo modules.builtin.modinfo: vmlinux.o FORCE $(call if_changed,objcopy) # module.builtin # --------------------------------------------------------------------------- # The second line aids cases where multiple modules share the same object. quiet_cmd_modules_builtin = GEN $@ cmd_modules_builtin = \ tr '\0' '\n' < $< | \ sed -n 's/^[[:alnum:]:_]*\.file=//p' | \ tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@ targets += modules.builtin modules.builtin: modules.builtin.modinfo FORCE $(call if_changed,modules_builtin) # Add FORCE to the prequisites 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)