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kbuild: enable objtool for *.mod.o and additional kernel objects

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Currently, objtool is disabled in scripts/Makefile.{modfinal,vmlinux}.

This commit moves rule_cc_o_c and rule_as_o_S to scripts/Makefile.lib
and set objtool-enabled to y there.

With this change, *.mod.o, .module-common.o,  builtin-dtb.o, and
vmlinux.export.o will now be covered by objtool.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2024-11-14 08:45:22 +09:00
parent 000e22a80d
commit bede169618
4 changed files with 29 additions and 28 deletions
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23
scripts/Makefile.build
View File

@ -129,12 +129,6 @@ $(obj)/%.ll: $(obj)/%.c FORCE
is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y)
# When a module consists of a single object, there is no reason to keep LLVM IR.
# Make $(LD) covert LLVM IR to ELF here.
ifdef CONFIG_LTO_CLANG
cmd_ld_single_m = $(if $(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
endif
ifdef CONFIG_MODVERSIONS
# When module versioning is enabled the following steps are executed:
# o compile a <file>.o from <file>.c
@ -195,23 +189,6 @@ ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)
cmd_warn_shared_object = $(if $(word 2, $(modname-multi)),$(warning $(kbuild-file): $*.o is added to multiple modules: $(modname-multi)))
endif
define rule_cc_o_c
$(call cmd_and_fixdep,cc_o_c)
$(call cmd,checksrc)
$(call cmd,checkdoc)
$(call cmd,gen_objtooldep)
$(call cmd,gen_symversions_c)
$(call cmd,record_mcount)
$(call cmd,warn_shared_object)
endef
define rule_as_o_S
$(call cmd_and_fixdep,as_o_S)
$(call cmd,gen_objtooldep)
$(call cmd,gen_symversions_S)
$(call cmd,warn_shared_object)
endef
# Built-in and composite module parts
$(obj)/%.o: $(obj)/%.c $(recordmcount_source) FORCE
$(call if_changed_rule,cc_o_c)

26
scripts/Makefile.lib
View File

@ -302,14 +302,38 @@ endef
# ===========================================================================
# These are shared by some Makefile.* files.
objtool-enabled := y
ifdef CONFIG_LTO_CLANG
# objtool cannot process LLVM IR. Make $(LD) covert LLVM IR to ELF here.
cmd_ld_single = $(if $(objtool-enabled), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
endif
quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
$(cmd_ld_single_m) \
$(cmd_ld_single) \
$(cmd_objtool)
define rule_cc_o_c
$(call cmd_and_fixdep,cc_o_c)
$(call cmd,checksrc)
$(call cmd,checkdoc)
$(call cmd,gen_objtooldep)
$(call cmd,gen_symversions_c)
$(call cmd,record_mcount)
$(call cmd,warn_shared_object)
endef
quiet_cmd_as_o_S = AS $(quiet_modtag) $@
cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
define rule_as_o_S
$(call cmd_and_fixdep,as_o_S)
$(call cmd,gen_objtooldep)
$(call cmd,gen_symversions_S)
$(call cmd,warn_shared_object)
endef
# Copy a file
# ===========================================================================
# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,

4
scripts/Makefile.modfinal
View File

@ -24,10 +24,10 @@ KCSAN_SANITIZE := n
ccflags-remove-y := $(CC_FLAGS_CFI)
%.mod.o: %.mod.c FORCE
$(call if_changed_dep,cc_o_c)
$(call if_changed_rule,cc_o_c)
.module-common.o: $(srctree)/scripts/module-common.c FORCE
$(call if_changed_dep,cc_o_c)
$(call if_changed_rule,cc_o_c)
quiet_cmd_ld_ko_o = LD [M] $@
cmd_ld_ko_o = \

4
scripts/Makefile.vmlinux
View File

@ -10,10 +10,10 @@ include $(srctree)/scripts/Makefile.lib
targets :=
%.o: %.c FORCE
$(call if_changed_dep,cc_o_c)
$(call if_changed_rule,cc_o_c)
%.o: %.S FORCE
$(call if_changed_dep,as_o_S)
$(call if_changed_rule,as_o_S)
# Built-in dtb
# ---------------------------------------------------------------------------