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For (!X86_KERNEL_IBT && !LTO_CLANG && NOINSTR_VALIDATION), objtool runs on both translation units and vmlinux.o. The vmlinux.o run only does noinstr/noret validation. In that case --no-unreachable has no effect. Remove it. Note that for ((X86_KERNEL_IBT || LTO_CLANG) && KCOV), --no-unreachable still gets set in objtool-args-y by scripts/Makefile.lib. Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/05414246a0124db2f21b0d071b652aa9043d039d.1742852847.git.jpoimboe@kernel.org
115 lines
3.6 KiB
Text
115 lines
3.6 KiB
Text
# 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 delay-objtool (IBT or LTO), objtool doesn't run on individual translation
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# units. Instead it runs on vmlinux.o.
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#
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# For !delay-objtool + CONFIG_NOINSTR_VALIDATION, it runs on both translation
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# units and vmlinux.o, with the latter only used for noinstr/unret validation.
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objtool-enabled := $(or $(delay-objtool),$(CONFIG_NOINSTR_VALIDATION))
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ifeq ($(delay-objtool),y)
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vmlinux-objtool-args-y += $(objtool-args-y)
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else
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vmlinux-objtool-args-$(CONFIG_OBJTOOL_WERROR) += --Werror
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endif
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vmlinux-objtool-args-$(CONFIG_NOINSTR_VALIDATION) += --noinstr \
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$(if $(or $(CONFIG_MITIGATION_UNRET_ENTRY),$(CONFIG_MITIGATION_SRSO)), --unret)
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objtool-args = $(vmlinux-objtool-args-y) --link
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# Link of vmlinux.o used for section mismatch analysis
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# ---------------------------------------------------------------------------
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vmlinux-o-ld-args-$(CONFIG_BUILTIN_MODULE_RANGES) += -Map=$@.map
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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 $@ \
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$(vmlinux-o-ld-args-y) \
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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 prerequisites 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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