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87 lines
2.7 KiB
87 lines
2.7 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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PHONY := __default |
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__default: vmlinux.o |
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include include/config/auto.conf |
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include $(srctree)/scripts/Kbuild.include |
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# for objtool |
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include $(srctree)/scripts/Makefile.lib |
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# Generate a linker script to ensure correct ordering of initcalls for Clang LTO |
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# --------------------------------------------------------------------------- |
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quiet_cmd_gen_initcalls_lds = GEN $@ |
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cmd_gen_initcalls_lds = \ |
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$(PYTHON3) $(srctree)/scripts/jobserver-exec \ |
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$(PERL) $(real-prereqs) > $@ |
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.tmp_initcalls.lds: $(srctree)/scripts/generate_initcall_order.pl \ |
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$(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE |
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$(call if_changed,gen_initcalls_lds) |
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targets := .tmp_initcalls.lds |
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ifdef CONFIG_LTO_CLANG |
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initcalls-lds := .tmp_initcalls.lds |
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endif |
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# objtool for vmlinux.o |
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# --------------------------------------------------------------------------- |
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# |
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# For LTO and IBT, objtool doesn't run on individual translation units. |
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# Run everything on vmlinux instead. |
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objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION)) |
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# Reuse objtool_args defined in scripts/Makefile.lib if LTO or IBT is enabled. |
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# |
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# Add some more flags as needed. |
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# --no-unreachable and --link might be added twice, but it is fine. |
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# |
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# Expand objtool_args to a simple variable to avoid circular reference. |
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objtool_args := \ |
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$(if $(delay-objtool),$(objtool_args)) \ |
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$(if $(CONFIG_NOINSTR_VALIDATION), --noinstr $(if $(CONFIG_CPU_UNRET_ENTRY), --unret)) \ |
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$(if $(CONFIG_GCOV_KERNEL), --no-unreachable) \ |
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--link |
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# Link of vmlinux.o used for section mismatch analysis |
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# --------------------------------------------------------------------------- |
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quiet_cmd_ld_vmlinux.o = LD $@ |
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cmd_ld_vmlinux.o = \ |
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$(LD) ${KBUILD_LDFLAGS} -r -o $@ \ |
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$(addprefix -T , $(initcalls-lds)) \ |
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--whole-archive $(KBUILD_VMLINUX_OBJS) --no-whole-archive \ |
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--start-group $(KBUILD_VMLINUX_LIBS) --end-group \ |
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$(cmd_objtool) |
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define rule_ld_vmlinux.o |
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$(call cmd_and_savecmd,ld_vmlinux.o) |
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$(call cmd,gen_objtooldep) |
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endef |
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vmlinux.o: $(initcalls-lds) $(KBUILD_VMLINUX_OBJS) $(KBUILD_VMLINUX_LIBS) FORCE |
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$(call if_changed_rule,ld_vmlinux.o) |
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targets += vmlinux.o |
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# Add FORCE to the prequisites of a target to force it to be always rebuilt. |
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# --------------------------------------------------------------------------- |
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PHONY += FORCE |
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FORCE: |
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# Read all saved command lines and dependencies for the $(targets) we |
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# may be building above, using $(if_changed{,_dep}). As an |
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# optimization, we don't need to read them if the target does not |
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# exist, we will rebuild anyway in that case. |
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existing-targets := $(wildcard $(sort $(targets))) |
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-include $(foreach f,$(existing-targets),$(dir $(f)).$(notdir $(f)).cmd) |
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.PHONY: $(PHONY)
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