31cb50b559
The 'static' specifier and EXPORT_SYMBOL() are an odd combination. Commit15bfc2348d("modpost: check for static EXPORT_SYMBOL* functions") tried to detect it, but this check has false negatives. Here is the sample code. Makefile: obj-y += foo1.o foo2.o foo1.c: #include <linux/export.h> static void foo(void) {} EXPORT_SYMBOL(foo); foo2.c: void foo(void) {} foo1.c exports the static symbol 'foo', but modpost cannot catch it because it is fooled by foo2.c, which has a global symbol with the same name. s->is_static is cleared if a global symbol with the same name is found somewhere, but EXPORT_SYMBOL() and the global symbol do not necessarily belong to the same compilation unit. This check should be done per compilation unit, but I do not know how to do it in modpost. modpost runs against vmlinux.o or modules, which merges multiple objects, then forgets their origin. modpost cannot parse individual objects because they may not be ELF but LLVM IR when CONFIG_LTO_CLANG=y. Add a simple bash script to parse the output from ${NM}. This works for CONFIG_LTO_CLANG=y because llvm-nm can dump symbols of LLVM IR files. Revert15bfc2348d. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Tested-by: Nathan Chancellor <nathan@kernel.org> Tested-by: Sedat Dilek <sedat.dilek@gmail.com> # LLVM-14 (x86-64)
511 lines
17 KiB
Makefile
511 lines
17 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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# ==========================================================================
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# Building
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# ==========================================================================
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src := $(obj)
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PHONY := __build
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__build:
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# Init all relevant variables used in kbuild files so
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# 1) they have correct type
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# 2) they do not inherit any value from the environment
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obj-y :=
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obj-m :=
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lib-y :=
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lib-m :=
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always-y :=
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always-m :=
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targets :=
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subdir-y :=
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subdir-m :=
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EXTRA_AFLAGS :=
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EXTRA_CFLAGS :=
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EXTRA_CPPFLAGS :=
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EXTRA_LDFLAGS :=
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asflags-y :=
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ccflags-y :=
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cppflags-y :=
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ldflags-y :=
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subdir-asflags-y :=
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subdir-ccflags-y :=
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# Read auto.conf if it exists, otherwise ignore
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-include include/config/auto.conf
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include $(srctree)/scripts/Kbuild.include
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include $(srctree)/scripts/Makefile.compiler
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# The filename Kbuild has precedence over Makefile
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kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
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include $(or $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Makefile)
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include $(srctree)/scripts/Makefile.lib
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# Do not include hostprogs rules unless needed.
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# $(sort ...) is used here to remove duplicated words and excessive spaces.
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hostprogs := $(sort $(hostprogs))
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ifneq ($(hostprogs),)
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include $(srctree)/scripts/Makefile.host
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endif
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# Do not include userprogs rules unless needed.
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# $(sort ...) is used here to remove duplicated words and excessive spaces.
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userprogs := $(sort $(userprogs))
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ifneq ($(userprogs),)
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include $(srctree)/scripts/Makefile.userprogs
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endif
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ifndef obj
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$(warning kbuild: Makefile.build is included improperly)
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endif
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ifeq ($(need-modorder),)
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ifneq ($(obj-m),)
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$(warning $(patsubst %.o,'%.ko',$(obj-m)) will not be built even though obj-m is specified.)
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$(warning You cannot use subdir-y/m to visit a module Makefile. Use obj-y/m instead.)
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endif
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endif
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# ===========================================================================
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# subdir-builtin and subdir-modorder may contain duplications. Use $(sort ...)
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subdir-builtin := $(sort $(filter %/built-in.a, $(real-obj-y)))
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subdir-modorder := $(sort $(filter %/modules.order, $(obj-m)))
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targets-for-builtin := $(extra-y)
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ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
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targets-for-builtin += $(obj)/lib.a
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endif
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ifdef need-builtin
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targets-for-builtin += $(obj)/built-in.a
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endif
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targets-for-modules := $(foreach x, o mod $(if $(CONFIG_TRIM_UNUSED_KSYMS), usyms), \
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$(patsubst %.o, %.$x, $(filter %.o, $(obj-m))))
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ifdef need-modorder
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targets-for-modules += $(obj)/modules.order
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endif
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targets += $(targets-for-builtin) $(targets-for-modules)
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# Linus' kernel sanity checking tool
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ifeq ($(KBUILD_CHECKSRC),1)
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quiet_cmd_checksrc = CHECK $<
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cmd_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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else ifeq ($(KBUILD_CHECKSRC),2)
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quiet_cmd_force_checksrc = CHECK $<
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cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $<
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endif
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ifneq ($(KBUILD_EXTRA_WARN),)
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cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $<
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endif
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# Compile C sources (.c)
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# ---------------------------------------------------------------------------
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quiet_cmd_cc_s_c = CC $(quiet_modtag) $@
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cmd_cc_s_c = $(CC) $(filter-out $(DEBUG_CFLAGS) $(CC_FLAGS_LTO), $(c_flags)) -fverbose-asm -S -o $@ $<
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$(obj)/%.s: $(src)/%.c FORCE
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$(call if_changed_dep,cc_s_c)
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quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@
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cmd_cpp_i_c = $(CPP) $(c_flags) -o $@ $<
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$(obj)/%.i: $(src)/%.c FORCE
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$(call if_changed_dep,cpp_i_c)
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genksyms = scripts/genksyms/genksyms \
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$(if $(1), -T $(2)) \
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$(if $(KBUILD_PRESERVE), -p) \
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-r $(or $(wildcard $(2:.symtypes=.symref)), /dev/null)
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# These mirror gensymtypes_S and co below, keep them in synch.
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cmd_gensymtypes_c = $(CPP) -D__GENKSYMS__ $(c_flags) $< | $(genksyms)
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quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_c = $(call cmd_gensymtypes_c,true,$@) >/dev/null
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$(obj)/%.symtypes : $(src)/%.c FORCE
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$(call cmd,cc_symtypes_c)
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# LLVM assembly
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# Generate .ll files from .c
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quiet_cmd_cc_ll_c = CC $(quiet_modtag) $@
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cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $<
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$(obj)/%.ll: $(src)/%.c FORCE
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$(call if_changed_dep,cc_ll_c)
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# C (.c) files
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# The C file is compiled and updated dependency information is generated.
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# (See cmd_cc_o_c + relevant part of rule_cc_o_c)
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is-single-obj-m = $(and $(part-of-module),$(filter $@, $(obj-m)),y)
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# When a module consists of a single object, there is no reason to keep LLVM IR.
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# Make $(LD) covert LLVM IR to ELF here.
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ifdef CONFIG_LTO_CLANG
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cmd_ld_single_m = $(if $(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)
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endif
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quiet_cmd_cc_o_c = CC $(quiet_modtag) $@
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cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \
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$(cmd_ld_single_m) \
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$(cmd_objtool)
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ifdef CONFIG_MODVERSIONS
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# When module versioning is enabled the following steps are executed:
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# o compile a <file>.o from <file>.c
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# o if <file>.o doesn't contain a __ksymtab version, i.e. does
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# not export symbols, it's done.
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# o otherwise, we calculate symbol versions using the good old
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# genksyms on the preprocessed source and dump them into the .cmd file.
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# o modpost will extract versions from that file and create *.c files that will
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# be compiled and linked to the kernel and/or modules.
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gen_symversions = \
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if $(NM) $@ 2>/dev/null | grep -q __ksymtab; then \
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$(call cmd_gensymtypes_$(1),$(KBUILD_SYMTYPES),$(@:.o=.symtypes)) \
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>> $(dot-target).cmd; \
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fi
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cmd_gen_symversions_c = $(call gen_symversions,c)
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endif
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ifdef CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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# compiler will not generate __mcount_loc use recordmcount or recordmcount.pl
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ifdef BUILD_C_RECORDMCOUNT
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ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
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RECORDMCOUNT_FLAGS = -w
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endif
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# Due to recursion, we must skip empty.o.
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# The empty.o file is created in the make process in order to determine
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# the target endianness and word size. It is made before all other C
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# files, including recordmcount.
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sub_cmd_record_mcount = \
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if [ $(@) != "scripts/mod/empty.o" ]; then \
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$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)"; \
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fi;
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recordmcount_source := $(srctree)/scripts/recordmcount.c \
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$(srctree)/scripts/recordmcount.h
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else
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sub_cmd_record_mcount = perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
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"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
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"$(if $(CONFIG_64BIT),64,32)" \
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"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS)" \
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"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \
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"$(if $(part-of-module),1,0)" "$(@)";
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recordmcount_source := $(srctree)/scripts/recordmcount.pl
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endif # BUILD_C_RECORDMCOUNT
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cmd_record_mcount = $(if $(findstring $(strip $(CC_FLAGS_FTRACE)),$(_c_flags)), \
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$(sub_cmd_record_mcount))
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endif # CONFIG_FTRACE_MCOUNT_USE_RECORDMCOUNT
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ifdef CONFIG_OBJTOOL
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objtool := $(objtree)/tools/objtool/objtool
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objtool_args = \
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$(if $(CONFIG_HAVE_JUMP_LABEL_HACK), --hacks=jump_label) \
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$(if $(CONFIG_HAVE_NOINSTR_HACK), --hacks=noinstr) \
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$(if $(CONFIG_X86_KERNEL_IBT), --ibt) \
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$(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount) \
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$(if $(CONFIG_UNWINDER_ORC), --orc) \
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$(if $(CONFIG_RETPOLINE), --retpoline) \
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$(if $(CONFIG_SLS), --sls) \
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$(if $(CONFIG_STACK_VALIDATION), --stackval) \
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$(if $(CONFIG_HAVE_STATIC_CALL_INLINE), --static-call) \
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--uaccess \
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$(if $(delay-objtool), --link) \
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$(if $(part-of-module), --module) \
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$(if $(CONFIG_GCOV_KERNEL), --no-unreachable)
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cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool_args) $@)
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cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)
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endif # CONFIG_OBJTOOL
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# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file
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# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a file
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is-standard-object = $(if $(filter-out y%, $(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n),y)
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delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT))
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$(obj)/%.o: objtool-enabled = $(if $(is-standard-object),$(if $(delay-objtool),$(is-single-obj-m),y))
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ifdef CONFIG_TRIM_UNUSED_KSYMS
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cmd_gen_ksymdeps = \
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$(CONFIG_SHELL) $(srctree)/scripts/gen_ksymdeps.sh $@ >> $(dot-target).cmd
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endif
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cmd_check_local_export = $(srctree)/scripts/check-local-export $@
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define rule_cc_o_c
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$(call cmd_and_fixdep,cc_o_c)
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$(call cmd,gen_ksymdeps)
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$(call cmd,check_local_export)
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$(call cmd,checksrc)
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$(call cmd,checkdoc)
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$(call cmd,gen_objtooldep)
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$(call cmd,gen_symversions_c)
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$(call cmd,record_mcount)
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endef
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define rule_as_o_S
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$(call cmd_and_fixdep,as_o_S)
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$(call cmd,gen_ksymdeps)
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$(call cmd,check_local_export)
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$(call cmd,gen_objtooldep)
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$(call cmd,gen_symversions_S)
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endef
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# Built-in and composite module parts
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$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
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$(call if_changed_rule,cc_o_c)
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$(call cmd,force_checksrc)
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cmd_mod = echo $(addprefix $(obj)/, $(call real-search, $*.o, .o, -objs -y -m)) | \
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$(AWK) -v RS='( |\n)' '!x[$$0]++' > $@
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$(obj)/%.mod: FORCE
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$(call if_changed,mod)
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# List module undefined symbols
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cmd_undefined_syms = $(NM) $< | sed -n 's/^ *U //p' > $@
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$(obj)/%.usyms: $(obj)/%.o FORCE
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$(call if_changed,undefined_syms)
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quiet_cmd_cc_lst_c = MKLST $@
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cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
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$(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
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System.map $(OBJDUMP) > $@
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$(obj)/%.lst: $(src)/%.c FORCE
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$(call if_changed_dep,cc_lst_c)
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# Compile assembler sources (.S)
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# ---------------------------------------------------------------------------
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# .S file exports must have their C prototypes defined in asm/asm-prototypes.h
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# or a file that it includes, in order to get versioned symbols. We build a
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# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from
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# the .S file (with trailing ';'), and run genksyms on that, to extract vers.
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#
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# This is convoluted. The .S file must first be preprocessed to run guards and
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# expand names, then the resulting exports must be constructed into plain
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# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed
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# to make the genksyms input.
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#
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# These mirror gensymtypes_c and co above, keep them in synch.
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cmd_gensymtypes_S = \
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{ echo "\#include <linux/kernel.h>" ; \
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echo "\#include <asm/asm-prototypes.h>" ; \
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$(CPP) $(a_flags) $< | \
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grep "\<___EXPORT_SYMBOL\>" | \
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sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ; } | \
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$(CPP) -D__GENKSYMS__ $(c_flags) -xc - | $(genksyms)
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quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@
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cmd_cc_symtypes_S = $(call cmd_gensymtypes_S,true,$@) >/dev/null
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$(obj)/%.symtypes : $(src)/%.S FORCE
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$(call cmd,cc_symtypes_S)
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quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@
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cmd_cpp_s_S = $(CPP) $(a_flags) -o $@ $<
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$(obj)/%.s: $(src)/%.S FORCE
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$(call if_changed_dep,cpp_s_S)
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quiet_cmd_as_o_S = AS $(quiet_modtag) $@
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cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)
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ifdef CONFIG_ASM_MODVERSIONS
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# versioning matches the C process described above, with difference that
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# we parse asm-prototypes.h C header to get function definitions.
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cmd_gen_symversions_S = $(call gen_symversions,S)
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endif
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$(obj)/%.o: $(src)/%.S FORCE
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$(call if_changed_rule,as_o_S)
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targets += $(filter-out $(subdir-builtin), $(real-obj-y))
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targets += $(filter-out $(subdir-modorder), $(real-obj-m))
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targets += $(real-dtb-y) $(lib-y) $(always-y) $(MAKECMDGOALS)
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# Linker scripts preprocessor (.lds.S -> .lds)
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# ---------------------------------------------------------------------------
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quiet_cmd_cpp_lds_S = LDS $@
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cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \
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-D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<
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$(obj)/%.lds: $(src)/%.lds.S FORCE
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$(call if_changed_dep,cpp_lds_S)
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# ASN.1 grammar
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# ---------------------------------------------------------------------------
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quiet_cmd_asn1_compiler = ASN.1 $(basename $@).[ch]
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cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
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$(basename $@).c $(basename $@).h
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$(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
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$(call cmd,asn1_compiler)
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# Build the compiled-in targets
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# ---------------------------------------------------------------------------
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# To build objects in subdirs, we need to descend into the directories
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$(subdir-builtin): $(obj)/%/built-in.a: $(obj)/% ;
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$(subdir-modorder): $(obj)/%/modules.order: $(obj)/% ;
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#
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# Rule to compile a set of .o files into one .a file (without symbol table)
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#
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quiet_cmd_ar_builtin = AR $@
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cmd_ar_builtin = rm -f $@; $(AR) cDPrST $@ $(real-prereqs)
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$(obj)/built-in.a: $(real-obj-y) FORCE
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$(call if_changed,ar_builtin)
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#
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# Rule to create modules.order file
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#
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# Create commands to either record .ko file or cat modules.order from
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# a subdirectory
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# Add $(obj-m) as the prerequisite to avoid updating the timestamp of
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# modules.order unless contained modules are updated.
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cmd_modules_order = { $(foreach m, $(real-prereqs), \
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$(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \
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| $(AWK) '!x[$$0]++' - > $@
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$(obj)/modules.order: $(obj-m) FORCE
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$(call if_changed,modules_order)
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#
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# Rule to compile a set of .o files into one .a file (with symbol table)
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#
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$(obj)/lib.a: $(lib-y) FORCE
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$(call if_changed,ar)
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quiet_cmd_link_multi-m = LD [M] $@
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cmd_link_multi-m = $(LD) $(ld_flags) -r -o $@ @$(patsubst %.o,%.mod,$@) $(cmd_objtool)
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|
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$(multi-obj-m): objtool-enabled := $(delay-objtool)
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$(multi-obj-m): part-of-module := y
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$(multi-obj-m): %.o: %.mod FORCE
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$(call if_changed,link_multi-m)
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$(call multi_depend, $(multi-obj-m), .o, -objs -y -m)
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targets := $(filter-out $(PHONY), $(targets))
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# Add intermediate targets:
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# When building objects with specific suffix patterns, add intermediate
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# targets that the final targets are derived from.
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intermediate_targets = $(foreach sfx, $(2), \
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$(patsubst %$(strip $(1)),%$(sfx), \
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|
$(filter %$(strip $(1)), $(targets))))
|
|
# %.asn1.o <- %.asn1.[ch] <- %.asn1
|
|
# %.dtb.o <- %.dtb.S <- %.dtb <- %.dts
|
|
# %.lex.o <- %.lex.c <- %.l
|
|
# %.tab.o <- %.tab.[ch] <- %.y
|
|
targets += $(call intermediate_targets, .asn1.o, .asn1.c .asn1.h) \
|
|
$(call intermediate_targets, .dtb.o, .dtb.S .dtb) \
|
|
$(call intermediate_targets, .lex.o, .lex.c) \
|
|
$(call intermediate_targets, .tab.o, .tab.c .tab.h)
|
|
|
|
# Build
|
|
# ---------------------------------------------------------------------------
|
|
|
|
ifdef single-build
|
|
|
|
KBUILD_SINGLE_TARGETS := $(filter $(obj)/%, $(KBUILD_SINGLE_TARGETS))
|
|
|
|
curdir-single := $(sort $(foreach x, $(KBUILD_SINGLE_TARGETS), \
|
|
$(if $(filter $(x) $(basename $(x)).o, $(targets)), $(x))))
|
|
|
|
# Handle single targets without any rule: show "Nothing to be done for ..." or
|
|
# "No rule to make target ..." depending on whether the target exists.
|
|
unknown-single := $(filter-out $(addsuffix /%, $(subdir-ym)), \
|
|
$(filter-out $(curdir-single), $(KBUILD_SINGLE_TARGETS)))
|
|
|
|
single-subdirs := $(foreach d, $(subdir-ym), \
|
|
$(if $(filter $(d)/%, $(KBUILD_SINGLE_TARGETS)), $(d)))
|
|
|
|
__build: $(curdir-single) $(single-subdirs)
|
|
ifneq ($(unknown-single),)
|
|
$(Q)$(MAKE) -f /dev/null $(unknown-single)
|
|
endif
|
|
@:
|
|
|
|
ifeq ($(curdir-single),)
|
|
# Nothing to do in this directory. Do not include any .*.cmd file for speed-up
|
|
targets :=
|
|
else
|
|
targets += $(curdir-single)
|
|
endif
|
|
|
|
else
|
|
|
|
__build: $(if $(KBUILD_BUILTIN), $(targets-for-builtin)) \
|
|
$(if $(KBUILD_MODULES), $(targets-for-modules)) \
|
|
$(subdir-ym) $(always-y)
|
|
@:
|
|
|
|
endif
|
|
|
|
# Descending
|
|
# ---------------------------------------------------------------------------
|
|
|
|
PHONY += $(subdir-ym)
|
|
$(subdir-ym):
|
|
$(Q)$(MAKE) $(build)=$@ \
|
|
$(if $(filter $@/, $(KBUILD_SINGLE_TARGETS)),single-build=) \
|
|
need-builtin=$(if $(filter $@/built-in.a, $(subdir-builtin)),1) \
|
|
need-modorder=$(if $(filter $@/modules.order, $(subdir-modorder)),1)
|
|
|
|
# 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)
|
|
|
|
# Create directories for object files if they do not exist
|
|
obj-dirs := $(sort $(patsubst %/,%, $(dir $(targets))))
|
|
# If targets exist, their directories apparently exist. Skip mkdir.
|
|
existing-dirs := $(sort $(patsubst %/,%, $(dir $(existing-targets))))
|
|
obj-dirs := $(strip $(filter-out $(existing-dirs), $(obj-dirs)))
|
|
ifneq ($(obj-dirs),)
|
|
$(shell mkdir -p $(obj-dirs))
|
|
endif
|
|
|
|
.PHONY: $(PHONY)
|