# SPDX-License-Identifier: GPL-2.0# ==========================================================================# Building# ========================================================================== src := $(obj) PHONY := __build__build: # Init all relevant variables used in kbuild files so# 1) they have correct type# 2) they do not inherit any value from the environmentobj-y :=obj-m :=lib-y :=lib-m :=always :=targets :=subdir-y :=subdir-m :=EXTRA_AFLAGS   :=EXTRA_CFLAGS   :=EXTRA_CPPFLAGS :=EXTRA_LDFLAGS  :=asflags-y  :=ccflags-y  :=cppflags-y :=ldflags-y  := subdir-asflags-y :=subdir-ccflags-y := # Read auto.conf if it exists, otherwise ignore-include include/config/auto.conf include scripts/Kbuild.include # For backward compatibility check that these variables do not changesave-cflags := $(CFLAGS) # The filename Kbuild has precedence over Makefilekbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)include $(kbuild-file) # If the save-* variables changed error outifeq ($(KBUILD_NOPEDANTIC),)        ifneq ("$(save-cflags)","$(CFLAGS)")                $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)        endifendif include scripts/Makefile.lib # Do not include host rules unless neededifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)include scripts/Makefile.hostendif ifndef obj$(warning kbuild: Makefile.build is included improperly)endif # =========================================================================== ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)lib-target := $(obj)/lib.areal-obj-y += $(obj)/lib-ksyms.oendif ifneq ($(strip $(real-obj-y) $(need-builtin)),)builtin-target := $(obj)/built-in.aendif modorder-target := $(obj)/modules.order # We keep a list of all modules in $(MODVERDIR) __build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \	 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \	 $(subdir-ym) $(always)	@: # Linus' kernel sanity checking toolifneq ($(KBUILD_CHECKSRC),0)  ifeq ($(KBUILD_CHECKSRC),2)    quiet_cmd_force_checksrc = CHECK   $<          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;  else      quiet_cmd_checksrc     = CHECK   $<            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;  endifendif ifneq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)  cmd_checkdoc = $(srctree)/scripts/kernel-doc -none $< ;endif # Do section mismatch analysis for each module/built-in.aifdef CONFIG_DEBUG_SECTION_MISMATCH  cmd_secanalysis = ; scripts/mod/modpost $@endif # Compile C sources (.c)# --------------------------------------------------------------------------- # Default is built-in, unless we know otherwisemodkern_cflags =                                          \	$(if $(part-of-module),                           \		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))quiet_modtag := $(empty)   $(empty) $(real-obj-m)        : part-of-module := y$(real-obj-m:.o=.i)  : part-of-module := y$(real-obj-m:.o=.s)  : part-of-module := y$(real-obj-m:.o=.lst): part-of-module := y $(real-obj-m)        : quiet_modtag := [M]$(real-obj-m:.o=.i)  : quiet_modtag := [M]$(real-obj-m:.o=.s)  : quiet_modtag := [M]$(real-obj-m:.o=.lst): quiet_modtag := [M] $(obj-m)             : quiet_modtag := [M] quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $< $(obj)/%.s: $(src)/%.c FORCE	$(call if_changed_dep,cc_s_c) quiet_cmd_cpp_i_c = CPP $(quiet_modtag) $@cmd_cpp_i_c       = $(CPP) $(c_flags) -o $@ $< $(obj)/%.i: $(src)/%.c FORCE	$(call if_changed_dep,cpp_i_c) # These mirror gensymtypes_S and co below, keep them in synch.cmd_gensymtypes_c =                                                         \    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \    $(GENKSYMS) $(if $(1), -T $(2))                                         \     $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \     $(if $(KBUILD_PRESERVE),-p)                                            \     -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@cmd_cc_symtypes_c =                                                         \    set -e;                                                                 \    $(call cmd_gensymtypes_c,true,$@) >/dev/null;                           \    test -s $@ || rm -f $@ $(obj)/%.symtypes : $(src)/%.c FORCE	$(call cmd,cc_symtypes_c) # LLVM assembly# Generate .ll files from .cquiet_cmd_cc_ll_c = CC $(quiet_modtag)  $@      cmd_cc_ll_c = $(CC) $(c_flags) -emit-llvm -S -o $@ $< $(obj)/%.ll: $(src)/%.c FORCE	$(call if_changed_dep,cc_ll_c) # C (.c) files# The C file is compiled and updated dependency information is generated.# (See cmd_cc_o_c + relevant part of rule_cc_o_c) quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@ ifndef CONFIG_MODVERSIONScmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< else# When module versioning is enabled the following steps are executed:# o compile a .tmp_<file>.o from <file>.c# o if .tmp_<file>.o doesn't contain a __ksymtab version, i.e. does#   not export symbols, we just rename .tmp_<file>.o to <file>.o and#   are done.# o otherwise, we calculate symbol versions using the good old#   genksyms on the preprocessed source and postprocess them in a way#   that they are usable as a linker script# o generate <file>.o from .tmp_<file>.o using the linker to#   replace the unresolved symbols __crc_exported_symbol with#   the actual value of the checksum generated by genksyms cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $< cmd_modversions_c =								\	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then		\		$(call cmd_gensymtypes_c,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))	\		    > $(@D)/.tmp_$(@F:.o=.ver);					\										\		$(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) 		\			-T $(@D)/.tmp_$(@F:.o=.ver);				\		rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);		\	else									\		mv -f $(@D)/.tmp_$(@F) $@;					\	fi;endif ifdef CONFIG_FTRACE_MCOUNT_RECORDifndef CC_USING_RECORD_MCOUNT# compiler will not generate __mcount_loc use recordmcount or recordmcount.plifdef BUILD_C_RECORDMCOUNTifeq ("$(origin RECORDMCOUNT_WARN)", "command line")  RECORDMCOUNT_FLAGS = -wendif# Due to recursion, we must skip empty.o.# The empty.o file is created in the make process in order to determine# the target endianness and word size. It is made before all other C# files, including recordmcount.sub_cmd_record_mcount =					\	if [ $(@) != "scripts/mod/empty.o" ]; then	\		$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";	\	fi;recordmcount_source := $(srctree)/scripts/recordmcount.c \		    $(srctree)/scripts/recordmcount.helsesub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \	"$(if $(CONFIG_64BIT),64,32)" \	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \	"$(LD) $(KBUILD_LDFLAGS)" "$(NM)" "$(RM)" "$(MV)" \	"$(if $(part-of-module),1,0)" "$(@)";recordmcount_source := $(srctree)/scripts/recordmcount.plendif # BUILD_C_RECORDMCOUNTcmd_record_mcount =						\	if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =	\	     "$(CC_FLAGS_FTRACE)" ]; then			\		$(sub_cmd_record_mcount)			\	fi;endif # CC_USING_RECORD_MCOUNTendif # CONFIG_FTRACE_MCOUNT_RECORD ifdef CONFIG_STACK_VALIDATIONifneq ($(SKIP_STACK_VALIDATION),1) __objtool_obj := $(objtree)/tools/objtool/objtool objtool_args = $(if $(CONFIG_UNWINDER_ORC),orc generate,check) objtool_args += $(if $(part-of-module), --module,) ifndef CONFIG_FRAME_POINTERobjtool_args += --no-fpendififdef CONFIG_GCOV_KERNELobjtool_args += --no-unreachableendififdef CONFIG_RETPOLINEifneq ($(RETPOLINE_CFLAGS),)  objtool_args += --retpolineendifendif  ifdef CONFIG_MODVERSIONSobjtool_o = $(@D)/.tmp_$(@F)elseobjtool_o = $(@)endif # 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory# 'OBJECT_FILES_NON_STANDARD_foo.o := 'y': skip objtool checking for a file# 'OBJECT_FILES_NON_STANDARD_foo.o := 'n': override directory skip for a filecmd_objtool = $(if $(patsubst y%,, \	$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \	$(__objtool_obj) $(objtool_args) "$(objtool_o)";)objtool_obj = $(if $(patsubst y%,, \	$(OBJECT_FILES_NON_STANDARD_$(basetarget).o)$(OBJECT_FILES_NON_STANDARD)n), \	$(__objtool_obj)) endif # SKIP_STACK_VALIDATIONendif # CONFIG_STACK_VALIDATION # Rebuild all objects when objtool changes, or is enabled/disabled.objtool_dep = $(objtool_obj)					\	      $(wildcard include/config/orc/unwinder.h		\			 include/config/stack/validation.h) define rule_cc_o_c	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \	$(call cmd_and_fixdep,cc_o_c)					  \	$(cmd_checkdoc)							  \	$(call echo-cmd,objtool) $(cmd_objtool)				  \	$(cmd_modversions_c)						  \	$(call echo-cmd,record_mcount) $(cmd_record_mcount)endef define rule_as_o_S	$(call cmd_and_fixdep,as_o_S)					  \	$(call echo-cmd,objtool) $(cmd_objtool)				  \	$(cmd_modversions_S)endef # List module undefined symbols (or empty line if not enabled)ifdef CONFIG_TRIM_UNUSED_KSYMScmd_undef_syms = $(NM) $@ | sed -n 's/^  *U //p' | xargs echoelsecmd_undef_syms = echoendif # Built-in and composite module parts$(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE	$(call cmd,force_checksrc)	$(call if_changed_rule,cc_o_c) # Single-part modules are special since we need to mark them in $(MODVERDIR) $(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) $(objtool_dep) FORCE	$(call cmd,force_checksrc)	$(call if_changed_rule,cc_o_c)	@{ echo $(@:.o=.ko); echo $@; \	   $(cmd_undef_syms); } > $(MODVERDIR)/$(@F:.o=.mod) quiet_cmd_cc_lst_c = MKLST   $@      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \		     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \				     System.map $(OBJDUMP) > $@ $(obj)/%.lst: $(src)/%.c FORCE	$(call if_changed_dep,cc_lst_c) # Compile assembler sources (.S)# --------------------------------------------------------------------------- modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(real-obj-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)$(real-obj-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE) # .S file exports must have their C prototypes defined in asm/asm-prototypes.h# or a file that it includes, in order to get versioned symbols. We build a# dummy C file that includes asm-prototypes and the EXPORT_SYMBOL lines from# the .S file (with trailing ';'), and run genksyms on that, to extract vers.## This is convoluted. The .S file must first be preprocessed to run guards and# expand names, then the resulting exports must be constructed into plain# EXPORT_SYMBOL(symbol); to build our dummy C file, and that gets preprocessed# to make the genksyms input.## These mirror gensymtypes_c and co above, keep them in synch.cmd_gensymtypes_S =                                                         \    (echo "\#include <linux/kernel.h>" ;                                    \     echo "\#include <asm/asm-prototypes.h>" ;                              \    $(CPP) $(a_flags) $< |                                                  \     grep "\<___EXPORT_SYMBOL\>" |                                          \     sed 's/.*___EXPORT_SYMBOL[[:space:]]*\([a-zA-Z0-9_]*\)[[:space:]]*,.*/EXPORT_SYMBOL(\1);/' ) | \    $(CPP) -D__GENKSYMS__ $(c_flags) -xc - |                                \    $(GENKSYMS) $(if $(1), -T $(2))                                         \     $(patsubst y,-R,$(CONFIG_MODULE_REL_CRCS))                             \     $(if $(KBUILD_PRESERVE),-p)                                            \     -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null)) quiet_cmd_cc_symtypes_S = SYM $(quiet_modtag) $@cmd_cc_symtypes_S =                                                         \    set -e;                                                                 \    $(call cmd_gensymtypes_S,true,$@) >/dev/null;                           \    test -s $@ || rm -f $@ $(obj)/%.symtypes : $(src)/%.S FORCE	$(call cmd,cc_symtypes_S)  quiet_cmd_cpp_s_S = CPP $(quiet_modtag) $@cmd_cpp_s_S       = $(CPP) $(a_flags) -o $@ $< $(obj)/%.s: $(src)/%.S FORCE	$(call if_changed_dep,cpp_s_S) quiet_cmd_as_o_S = AS $(quiet_modtag)  $@ ifndef CONFIG_MODVERSIONScmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< else ASM_PROTOTYPES := $(wildcard $(srctree)/arch/$(SRCARCH)/include/asm/asm-prototypes.h) ifeq ($(ASM_PROTOTYPES),)cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< else # versioning matches the C process described above, with difference that# we parse asm-prototypes.h C header to get function definitions. cmd_as_o_S = $(CC) $(a_flags) -c -o $(@D)/.tmp_$(@F) $< cmd_modversions_S =								\	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then		\		$(call cmd_gensymtypes_S,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))	\		    > $(@D)/.tmp_$(@F:.o=.ver);					\										\		$(LD) $(KBUILD_LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) 		\			-T $(@D)/.tmp_$(@F:.o=.ver);				\		rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);		\	else									\		mv -f $(@D)/.tmp_$(@F) $@;					\	fi;endifendif $(obj)/%.o: $(src)/%.S $(objtool_dep) FORCE	$(call if_changed_rule,as_o_S) targets += $(filter-out $(subdir-obj-y), $(real-obj-y)) $(real-obj-m) $(lib-y)targets += $(extra-y) $(MAKECMDGOALS) $(always) # Linker scripts preprocessor (.lds.S -> .lds)# ---------------------------------------------------------------------------quiet_cmd_cpp_lds_S = LDS     $@      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -U$(ARCH) \	                     -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $< $(obj)/%.lds: $(src)/%.lds.S FORCE	$(call if_changed_dep,cpp_lds_S) # ASN.1 grammar# ---------------------------------------------------------------------------quiet_cmd_asn1_compiler = ASN.1   $@      cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \				$(subst .h,.c,$@) $(subst .c,.h,$@) $(obj)/%.asn1.c $(obj)/%.asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler	$(call cmd,asn1_compiler) # Build the compiled-in targets# --------------------------------------------------------------------------- # To build objects in subdirs, we need to descend into the directories$(sort $(subdir-obj-y)): $(subdir-ym) ; ## Rule to compile a set of .o files into one .o file#ifdef builtin-target # built-in.a archives are made with no symbol table or index which# makes them small and fast, but unable to be used by the linker.# scripts/link-vmlinux.sh builds an aggregate built-in.a with a symbol# table and index.quiet_cmd_ar_builtin = AR      $@      cmd_ar_builtin = rm -f $@; \                     $(AR) rcSTP$(KBUILD_ARFLAGS) $@ $(filter $(real-obj-y), $^) $(builtin-target): $(real-obj-y) FORCE	$(call if_changed,ar_builtin) targets += $(builtin-target)endif # builtin-target ## Rule to create modules.order file## Create commands to either record .ko file or cat modules.order from# a subdirectorymodorder-cmds =						\	$(foreach m, $(modorder),			\		$(if $(filter %/modules.order, $m),	\			cat $m;, echo kernel/$m;)) $(modorder-target): $(subdir-ym) FORCE	$(Q)(cat /dev/null; $(modorder-cmds)) > $@ ## Rule to compile a set of .o files into one .a file#ifdef lib-targetquiet_cmd_link_l_target = AR      $@ # lib target archives do get a symbol table and indexcmd_link_l_target = rm -f $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(lib-y) $(lib-target): $(lib-y) FORCE	$(call if_changed,link_l_target) targets += $(lib-target) dummy-object = $(obj)/.lib_exports.oksyms-lds = $(dot-target).lds quiet_cmd_export_list = EXPORTS $@cmd_export_list = $(OBJDUMP) -h $< | \	sed -ne '/___ksymtab/s/.*+\([^ ]*\).*/EXTERN(\1)/p' >$(ksyms-lds);\	rm -f $(dummy-object);\	echo | $(CC) $(a_flags) -c -o $(dummy-object) -x assembler -;\	$(LD) $(ld_flags) -r -o $@ -T $(ksyms-lds) $(dummy-object);\	rm $(dummy-object) $(ksyms-lds) $(obj)/lib-ksyms.o: $(lib-target) FORCE	$(call if_changed,export_list) targets += $(obj)/lib-ksyms.o endif ## Rule to link composite objects#

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