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104 lines
3.2 KiB
104 lines
3.2 KiB
# SPDX-License-Identifier: GPL-2.0-only |
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PHONY := __default |
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__default: vmlinux.o modules.builtin.modinfo modules.builtin |
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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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vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE |
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$(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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vmlinux-objtool-args-$(delay-objtool) += $(objtool-args-y) |
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vmlinux-objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable |
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vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr $(if $(CONFIG_CPU_UNRET_ENTRY), --unret) |
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objtool-args = $(vmlinux-objtool-args-y) --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 vmlinux.a --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) vmlinux.a $(KBUILD_VMLINUX_LIBS) FORCE |
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$(call if_changed_rule,ld_vmlinux.o) |
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targets += vmlinux.o |
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# module.builtin.modinfo |
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# --------------------------------------------------------------------------- |
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OBJCOPYFLAGS_modules.builtin.modinfo := -j .modinfo -O binary |
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targets += modules.builtin.modinfo |
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modules.builtin.modinfo: vmlinux.o FORCE |
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$(call if_changed,objcopy) |
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# module.builtin |
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# --------------------------------------------------------------------------- |
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# The second line aids cases where multiple modules share the same object. |
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quiet_cmd_modules_builtin = GEN $@ |
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cmd_modules_builtin = \ |
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tr '\0' '\n' < $< | \ |
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sed -n 's/^[[:alnum:]:_]*\.file=//p' | \ |
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tr ' ' '\n' | uniq | sed -e 's:^:kernel/:' -e 's/$$/.ko/' > $@ |
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targets += modules.builtin |
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modules.builtin: modules.builtin.modinfo FORCE |
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$(call if_changed,modules_builtin) |
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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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