VERSION = 2018 PATCHLEVEL = 10 SUBLEVEL = 0 EXTRAVERSION = NAME = None # *DOCUMENTATION* # To see a list of typical targets execute "make help" # More info can be located in ./README # Comments in this file are targeted only to the developer, do not # expect to learn how to build the kernel reading this file. # Do not: # o use make's built-in rules and variables # (this increases performance and avoids hard-to-debug behaviour); # o print "Entering directory ..."; MAKEFLAGS += -rR --no-print-directory # We are using a recursive build, so we need to do a little thinking # to get the ordering right. # # Most importantly: sub-Makefiles should only ever modify files in # their own directory. If in some directory we have a dependency on # a file in another dir (which doesn't happen often, but it's often # unavoidable when linking the built-in.o targets which finally # turn into barebox), we will call a sub make in that other dir, and # after that we are sure that everything which is in that other dir # is now up to date. # # The only cases where we need to modify files which have global # effects are thus separated out and done before the recursive # descending is started. They are now explicitly listed as the # prepare rule. # To put more focus on warnings, be less verbose as default # Use 'make V=1' to see the full commands ifdef V ifeq ("$(origin V)", "command line") KBUILD_VERBOSE = $(V) endif endif ifndef KBUILD_VERBOSE KBUILD_VERBOSE = 0 endif # Call a source code checker (by default, "sparse") as part of the # C compilation. # # Use 'make C=1' to enable checking of only re-compiled files. # Use 'make C=2' to enable checking of *all* source files, regardless # of whether they are re-compiled or not. # # See the file "Documentation/sparse.txt" for more details, including # where to get the "sparse" utility. ifdef C ifeq ("$(origin C)", "command line") KBUILD_CHECKSRC = $(C) endif endif ifndef KBUILD_CHECKSRC KBUILD_CHECKSRC = 0 endif # Use make M=dir to specify directory of external module to build # Old syntax make ... SUBDIRS=$PWD is still supported # Setting the environment variable KBUILD_EXTMOD take precedence ifdef SUBDIRS KBUILD_EXTMOD ?= $(SUBDIRS) endif ifdef M ifeq ("$(origin M)", "command line") KBUILD_EXTMOD := $(M) endif endif # kbuild supports saving output files in a separate directory. # To locate output files in a separate directory two syntaxes are supported. # In both cases the working directory must be the root of the kernel src. # 1) O= # Use "make O=dir/to/store/output/files/" # # 2) Set KBUILD_OUTPUT # Set the environment variable KBUILD_OUTPUT to point to the directory # where the output files shall be placed. # export KBUILD_OUTPUT=dir/to/store/output/files/ # make # # The O= assignment takes precedence over the KBUILD_OUTPUT environment # variable. # KBUILD_SRC is set on invocation of make in OBJ directory # KBUILD_SRC is not intended to be used by the regular user (for now) ifeq ($(KBUILD_SRC),) # OK, Make called in directory where kernel src resides # Do we want to locate output files in a separate directory? ifdef O ifeq ("$(origin O)", "command line") KBUILD_OUTPUT := $(O) endif endif # That's our default target when none is given on the command line PHONY := _all _all: ifneq ($(KBUILD_OUTPUT),) # Invoke a second make in the output directory, passing relevant variables # check that the output directory actually exists saved-output := $(KBUILD_OUTPUT) KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \ && /bin/pwd) $(if $(KBUILD_OUTPUT),, \ $(error failed to create output directory "$(saved-output)")) PHONY += $(MAKECMDGOALS) $(filter-out _all,$(MAKECMDGOALS)) _all: $(if $(KBUILD_VERBOSE:1=),@)$(MAKE) -C $(KBUILD_OUTPUT) \ KBUILD_SRC=$(CURDIR) \ KBUILD_EXTMOD="$(KBUILD_EXTMOD)" -f $(CURDIR)/Makefile $@ # Leave processing to above invocation of make skip-makefile := 1 endif # ifneq ($(KBUILD_OUTPUT),) endif # ifeq ($(KBUILD_SRC),) # We process the rest of the Makefile if this is the final invocation of make ifeq ($(skip-makefile),) # If building an external module we do not care about the all: rule # but instead _all depend on modules PHONY += all _all: all # CDPATH can have sideeffects; disable, since we do know where we want to cd to export CDPATH= srctree := $(if $(KBUILD_SRC),$(KBUILD_SRC),$(CURDIR)) objtree := $(CURDIR) src := $(srctree) obj := $(objtree) VPATH := $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD)) export srctree objtree VPATH # Cross compiling and selecting different set of gcc/bin-utils # --------------------------------------------------------------------------- # # When performing cross compilation for other architectures ARCH shall be set # to the target architecture. (See arch/* for the possibilities). # ARCH can be set during invocation of make: # make ARCH=ia64 # Another way is to have ARCH set in the environment. # The default ARCH is the host where make is executed. # CROSS_COMPILE specify the prefix used for all executables used # during compilation. Only gcc and related bin-utils executables # are prefixed with $(CROSS_COMPILE). # CROSS_COMPILE can be set on the command line # make CROSS_COMPILE=ia64-linux- # Alternatively CROSS_COMPILE can be set in the environment. # Default value for CROSS_COMPILE is not to prefix executables ARCH ?= sandbox CROSS_COMPILE ?= # Architecture as present in compile.h UTS_MACHINE := $(ARCH) SRCARCH := $(ARCH) KCONFIG_CONFIG ?= .config # SHELL used by kbuild CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \ else if [ -x /bin/bash ]; then echo /bin/bash; \ else echo sh; fi ; fi) HOST_LFS_CFLAGS := $(shell getconf LFS_CFLAGS) HOST_LFS_LDFLAGS := $(shell getconf LFS_LDFLAGS) HOST_LFS_LIBS := $(shell getconf LFS_LIBS) HOSTCC = gcc HOSTCXX = g++ HOSTCFLAGS = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer $(HOST_LFS_CFLAGS) HOSTCXXFLAGS = -O2 $(HOST_LFS_CFLAGS) HOSTLDFLAGS = $(HOST_LFS_LDFLAGS) HOST_LOADLIBES = $(HOST_LFS_LIBS) # Decide whether to build built-in, modular, or both. # Normally, just do built-in. KBUILD_MODULES := KBUILD_BUILTIN := 1 # If we have only "make modules", don't compile built-in objects. # When we're building modules with modversions, we need to consider # the built-in objects during the descend as well, in order to # make sure the checksums are up to date before we record them. ifeq ($(MAKECMDGOALS),modules) KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1) endif # If we have "make modules", compile modules # in addition to whatever we do anyway. # Just "make" or "make all" shall build modules as well ifneq ($(filter all _all modules,$(MAKECMDGOALS)),) KBUILD_MODULES := 1 endif export KBUILD_MODULES KBUILD_BUILTIN export KBUILD_CHECKSRC KBUILD_SRC # Beautify output # --------------------------------------------------------------------------- # # Normally, we echo the whole command before executing it. By making # that echo $($(quiet)$(cmd)), we now have the possibility to set # $(quiet) to choose other forms of output instead, e.g. # # quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@ # cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< # # If $(quiet) is empty, the whole command will be printed. # If it is set to "quiet_", only the short version will be printed. # If it is set to "silent_", nothing will be printed at all, since # the variable $(silent_cmd_cc_o_c) doesn't exist. # # A simple variant is to prefix commands with $(Q) - that's useful # for commands that shall be hidden in non-verbose mode. # # $(Q)ln $@ :< # # If KBUILD_VERBOSE equals 0 then the above command will be hidden. # If KBUILD_VERBOSE equals 1 then the above command is displayed. ifeq ($(KBUILD_VERBOSE),1) quiet = Q = else quiet=quiet_ Q = @ endif # If the user is running make -s (silent mode), suppress echoing of # commands ifneq ($(findstring s,$(MAKEFLAGS)),) quiet=silent_ endif export quiet Q KBUILD_VERBOSE # Look for make include files relative to root of kernel src MAKEFLAGS += --include-dir=$(srctree) # We need some generic definitions. include $(srctree)/scripts/Kbuild.include include $(srctree)/scripts/Makefile.lib # Make variables (CC, etc...) AS = $(CROSS_COMPILE)as LD = $(CROSS_COMPILE)ld CC = $(CROSS_COMPILE)gcc CPP = $(CC) -E AR = $(CROSS_COMPILE)ar NM = $(CROSS_COMPILE)nm STRIP = $(CROSS_COMPILE)strip OBJCOPY = $(CROSS_COMPILE)objcopy OBJDUMP = $(CROSS_COMPILE)objdump AWK = awk GENKSYMS = scripts/genksyms/genksyms DEPMOD = /sbin/depmod KALLSYMS = scripts/kallsyms PERL = perl CHECK = sparse CHECKFLAGS := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ -Wbitwise $(CF) CFLAGS_KERNEL = AFLAGS_KERNEL = LDFLAGS_MODULE = -T common/module.lds # When compiling out-of-tree modules, put MODVERDIR in the module # tree rather than in the kernel tree. The kernel tree might # even be read-only. export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions # Use LINUXINCLUDE when you must reference the include/ directory. # Needed to be compatible with the O= option LINUXINCLUDE := -Iinclude -I$(srctree)/dts/include \ $(if $(KBUILD_SRC), -I$(srctree)/include) \ -I$(srctree)/arch/$(ARCH)/include \ -I$(objtree)/arch/$(ARCH)/include \ -include $(srctree)/include/linux/kconfig.h CPPFLAGS := -D__KERNEL__ -D__BAREBOX__ $(LINUXINCLUDE) -fno-builtin -ffreestanding CFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \ -Werror-implicit-function-declaration \ -fno-strict-aliasing -fno-common -Os -pipe AFLAGS := -D__ASSEMBLY__ LDFLAGS_barebox := -Map barebox.map # Avoid 'Not enough room for program headers' error on binutils 2.28 onwards. LDFLAGS_barebox += $(call ld-option, --no-dynamic-linker) # Read KERNELRELEASE from include/config/kernel.release (if it exists) KERNELRELEASE = $(shell cat include/config/kernel.release 2> /dev/null) KERNELVERSION = $(VERSION).$(PATCHLEVEL).$(SUBLEVEL)$(EXTRAVERSION) export VERSION PATCHLEVEL SUBLEVEL KERNELRELEASE KERNELVERSION export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC export CPP AR NM STRIP OBJCOPY OBJDUMP MAKE AWK GENKSYMS PERL UTS_MACHINE export HOSTCXX HOSTCXXFLAGS HOSTLDFLAGS HOST_LOADLIBES LDFLAGS_MODULE CHECK CHECKFLAGS export CPPFLAGS NOSTDINC_FLAGS LINUXINCLUDE OBJCOPYFLAGS LDFLAGS export CFLAGS CFLAGS_KERNEL export AFLAGS AFLAGS_KERNEL export LDFLAGS_barebox # Files to ignore in find ... statements RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o -name CVS -o -name .pc -o -name .hg -o -name .git \) -prune -o export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn --exclude CVS --exclude .pc --exclude .hg --exclude .git # =========================================================================== # Rules shared between *config targets and build targets # Basic helpers built in scripts/ PHONY += scripts_basic scripts_basic: $(Q)$(MAKE) $(build)=scripts/basic # To avoid any implicit rule to kick in, define an empty command. scripts/basic/%: scripts_basic ; PHONY += outputmakefile # outputmakefile generates a Makefile in the output directory, if using a # separate output directory. This allows convenient use of make in the # output directory. outputmakefile: ifneq ($(KBUILD_SRC),) $(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \ $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL) endif # To make sure we do not include .config for any of the *config targets # catch them early, and hand them over to scripts/kconfig/Makefile # It is allowed to specify more targets when calling make, including # mixing *config targets and build targets. # For example 'make oldconfig all'. # Detect when mixed targets is specified, and make a second invocation # of make so .config is not included in this case either (for *config). no-dot-config-targets := clean mrproper distclean \ cscope TAGS tags help %docs check% \ include/generated/version.h headers_% \ kernelrelease kernelversion config-targets := 0 mixed-targets := 0 dot-config := 1 ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),) ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),) dot-config := 0 endif endif ifneq ($(filter config %config,$(MAKECMDGOALS)),) config-targets := 1 ifneq ($(filter-out config %config,$(MAKECMDGOALS)),) mixed-targets := 1 endif endif ifeq ($(mixed-targets),1) # =========================================================================== # We're called with mixed targets (*config and build targets). # Handle them one by one. %:: FORCE $(Q)$(MAKE) -C $(srctree) KBUILD_SRC= $@ else ifeq ($(config-targets),1) # =========================================================================== # *config targets only - make sure prerequisites are updated, and descend # in scripts/kconfig to make the *config target # Read arch specific Makefile to set KBUILD_DEFCONFIG as needed. # KBUILD_DEFCONFIG may point out an alternative default configuration # used for 'make defconfig' include $(srctree)/arch/$(ARCH)/Makefile export KBUILD_DEFCONFIG config: scripts_basic outputmakefile FORCE $(Q)mkdir -p include/linux include/config $(Q)$(MAKE) $(build)=scripts/kconfig $@ %config: scripts_basic outputmakefile FORCE $(Q)mkdir -p include/linux include/config $(Q)$(MAKE) $(build)=scripts/kconfig $@ else # =========================================================================== # Build targets only - this includes barebox, arch specific targets, clean # targets and others. In general all targets except *config targets. # Additional helpers built in scripts/ # Carefully list dependencies so we do not try to build scripts twice # in parallel PHONY += scripts scripts: scripts_basic include/config/auto.conf $(Q)$(MAKE) $(build)=$(@) # Objects we will link into barebox / subdirs we need to visit common-y := common/ drivers/ commands/ lib/ crypto/ net/ fs/ firmware/ ifeq ($(dot-config),1) # Read in config -include include/config/auto.conf # Read in dependencies to all Kconfig* files, make sure to run # oldconfig if changes are detected. -include include/config/auto.conf.cmd # To avoid any implicit rule to kick in, define an empty command $(KCONFIG_CONFIG) include/config/auto.conf.cmd: ; # If .config is newer than include/config/auto.conf, someone tinkered # with it and forgot to run make oldconfig. # if auto.conf.cmd is missing then we are probably in a cleaned tree so # we execute the config step to be sure to catch updated Kconfig files include/config/auto.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd $(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig else # Dummy target needed, because used as prerequisite include/config/auto.conf: ; endif # $(dot-config) include $(srctree)/arch/$(ARCH)/Makefile ifdef CONFIG_DEBUG_INFO CFLAGS += -g endif # Force gcc to behave correct even for buggy distributions CFLAGS += $(call cc-option, -fno-stack-protector) # This warning generated too much noise in a regular build. # Use make W=1 to enable this warning (see scripts/Makefile.build) CFLAGS += $(call cc-disable-warning, unused-but-set-variable) CFLAGS += $(call cc-disable-warning, trampolines) CFLAGS += $(call cc-option, -fno-delete-null-pointer-checks,) # arch Makefile may override CC so keep this after arch Makefile is included NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include) CHECKFLAGS += $(NOSTDINC_FLAGS) # warn about C99 declaration after statement CFLAGS += $(call cc-option,-Wdeclaration-after-statement,) # disable pointer signed / unsigned warnings in gcc 4.0 CFLAGS += $(call cc-option,-Wno-pointer-sign,) # KBUILD_IMAGE: Default barebox image to build # Depending on the architecture, this can be either compressed or not. # It will also include any necessary headers to be bootable. export KBUILD_IMAGE ?= barebox.bin # KBUILD_BINARY: Raw barebox binary # This variable is set in case the architecture prepends a header and # points to a binary that can be loaded directly into RAM and executed. export KBUILD_BINARY ?= barebox.bin # KBUILD_IMAGE and _BINARY may be overruled on the command line or # set in the environment. # Also any assignments in arch/$(ARCH)/Makefile take precedence over # the default value. barebox-flash-image: $(KBUILD_IMAGE) FORCE $(call if_changed,ln) barebox-flash-images: $(KBUILD_IMAGE) @echo $^ > $@ images: barebox.bin FORCE $(Q)$(MAKE) $(build)=images $@ images/%.s: barebox.bin FORCE $(Q)$(MAKE) $(build)=images $@ ifdef CONFIG_PBL_MULTI_IMAGES all: barebox.bin images else all: barebox-flash-image barebox-flash-images endif common-$(CONFIG_PBL_IMAGE) += pbl/ common-$(CONFIG_DEFAULT_ENVIRONMENT) += defaultenv/ barebox-dirs := $(patsubst %/,%,$(filter %/, $(common-y))) barebox-alldirs := $(sort $(barebox-dirs) $(patsubst %/,%,$(filter %/, \ $(common-n) $(common-) \ $(core-n) $(core-) $(drivers-n) $(drivers-) \ $(net-n) $(net-) $(libs-n) $(libs-)))) pbl-common-y := $(patsubst %/, %/built-in-pbl.o, $(common-y)) common-y := $(patsubst %/, %/built-in.o, $(common-y)) ifeq ($(CONFIG_DEFAULT_COMPRESSION_GZIP),y) DEFAULT_COMPRESSION_SUFFIX := .gz endif ifeq ($(CONFIG_DEFAULT_COMPRESSED_BZIP2),y) DEFAULT_COMPRESSION_SUFFIX := .bz2 endif ifeq ($(CONFIG_DEFAULT_COMPRESSION_LZO),y) DEFAULT_COMPRESSION_SUFFIX := .lzo endif ifeq ($(CONFIG_DEFAULT_COMPRESSION_LZ4),y) DEFAULT_COMPRESSION_SUFFIX := .lz4 endif ifeq ($(CONFIG_DEFAULT_COMPRESSION_NONE),y) DEFAULT_COMPRESSION_SUFFIX := endif export DEFAULT_COMPRESSION_SUFFIX # Build barebox # --------------------------------------------------------------------------- # barebox is built from the objects selected by $(barebox-init) and # $(barebox-main). Most are built-in.o files from top-level directories # in the kernel tree, others are specified in arch/$(ARCH)Makefile. # Ordering when linking is important, and $(barebox-init) must be first. # # FIXME: This picture is wrong for barebox. We have no init, driver, mm # # barebox # ^ # | # +-< $(barebox-init) # | +--< init/version.o + more # | # +--< $(barebox-main) # | +--< driver/built-in.o mm/built-in.o + more # | # +-< kallsyms.o (see description in CONFIG_KALLSYMS section) # # barebox version cannot be updated during normal # descending-into-subdirs phase since we do not yet know if we need to # update barebox. # # System.map is generated to document addresses of all kernel symbols barebox-common := $(common-y) barebox-pbl-common := $(pbl-common-y) export barebox-pbl-common barebox-all := $(barebox-common) barebox-lds := $(lds-y) # Rule to link barebox # May be overridden by arch/$(ARCH)/Makefile quiet_cmd_barebox__ ?= LD $@ cmd_barebox__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_barebox) -o $@ \ -T $(barebox-lds) \ --start-group $(barebox-common) --end-group \ $(filter-out $(barebox-lds) $(barebox-common) FORCE ,$^) # Generate new barebox version quiet_cmd_barebox_version = GEN .version cmd_barebox_version = set -e; \ if [ ! -r .version ]; then \ rm -f .version; \ echo 1 >.version; \ else \ mv .version .old_version; \ expr 0$$(cat .old_version) + 1 >.version; \ fi; \ $(MAKE) $(build)=common # Generate System.map quiet_cmd_sysmap = SYSMAP cmd_sysmap = $(CONFIG_SHELL) $(srctree)/scripts/mksysmap # Link of barebox # If CONFIG_KALLSYMS is set .version is already updated # Generate System.map and verify that the content is consistent # Use + in front of the barebox_version rule to silent warning with make -j2 # First command is ':' to allow us to use + in front of the rule define rule_barebox__ : $(if $(CONFIG_KALLSYMS),,+$(call cmd,barebox_version)) $(call cmd,barebox__) $(Q)echo 'cmd_$@ := $(cmd_barebox__)' > $(@D)/.$(@F).cmd $(Q)$(if $($(quiet)cmd_sysmap), \ echo ' $($(quiet)cmd_sysmap) System.map' &&) \ $(cmd_sysmap) $@ System.map; \ if [ $$? -ne 0 ]; then \ rm -f $@; \ false; \ fi; endef ifdef CONFIG_KALLSYMS # Generate section listing all symbols and add it into barebox $(kallsyms.o) # It's a three stage process: # o .tmp_barebox1 has all symbols and sections, but __kallsyms is # empty # Running kallsyms on that gives us .tmp_kallsyms1.o with # the right size - barebox version is updated during this step # o .tmp_barebox2 now has a __kallsyms section of the right size, # but due to the added section, some addresses have shifted. # From here, we generate a correct .tmp_kallsyms2.o # o The correct .tmp_kallsyms2.o is linked into the final barebox. # o Verify that the System.map from barebox matches the map from # .tmp_barebox2, just in case we did not generate kallsyms correctly. # o If CONFIG_KALLSYMS_EXTRA_PASS is set, do an extra pass using # .tmp_barebox3 and .tmp_kallsyms3.o. This is only meant as a # temporary bypass to allow the kernel to be built while the # maintainers work out what went wrong with kallsyms. ifdef CONFIG_KALLSYMS_EXTRA_PASS last_kallsyms := 3 else last_kallsyms := 2 endif kallsyms.o := .tmp_kallsyms$(last_kallsyms).o define verify_kallsyms $(Q)$(if $($(quiet)cmd_sysmap), \ echo ' $($(quiet)cmd_sysmap) .tmp_System.map' &&) \ $(cmd_sysmap) .tmp_barebox$(last_kallsyms) .tmp_System.map $(Q)cmp -s System.map .tmp_System.map || \ (echo Inconsistent kallsyms data; \ echo Try setting CONFIG_KALLSYMS_EXTRA_PASS; \ rm .tmp_kallsyms* ; false ) endef # Update barebox version before link # Use + in front of this rule to silent warning about make -j1 # First command is ':' to allow us to use + in front of this rule cmd_ksym_ld = $(cmd_barebox__) define rule_ksym_ld : +$(call cmd,barebox_version) $(call cmd,barebox__) $(Q)echo 'cmd_$@ := $(cmd_barebox__)' > $(@D)/.$(@F).cmd endef # Generate .S file with all kernel symbols quiet_cmd_kallsyms = KSYM $@ cmd_kallsyms = $(NM) -n $< | $(KALLSYMS) --all-symbols > $@ .tmp_kallsyms1.o .tmp_kallsyms2.o .tmp_kallsyms3.o: %.o: %.S scripts FORCE $(call if_changed_dep,as_o_S) .tmp_kallsyms%.S: .tmp_barebox% $(KALLSYMS) $(call cmd,kallsyms) # .tmp_barebox1 must be complete except kallsyms, so update barebox version .tmp_barebox1: $(barebox-lds) $(barebox-all) FORCE $(call if_changed_rule,ksym_ld) .tmp_barebox2: $(barebox-lds) $(barebox-all) .tmp_kallsyms1.o FORCE $(call if_changed,barebox__) .tmp_barebox3: $(barebox-lds) $(barebox-all) .tmp_kallsyms2.o FORCE $(call if_changed,barebox__) # Needs to visit scripts/ before $(KALLSYMS) can be used. $(KALLSYMS): scripts ; # Generate some data for debugging strange kallsyms problems debug_kallsyms: .tmp_map$(last_kallsyms) .tmp_map%: .tmp_barebox% FORCE ($(OBJDUMP) -h $< | $(AWK) '/^ +[0-9]/{print $$4 " 0 " $$2}'; $(NM) $<) | sort > $@ .tmp_map3: .tmp_map2 .tmp_map2: .tmp_map1 endif # ifdef CONFIG_KALLSYMS # Do modpost on a prelinked vmlinux. The finally linked vmlinux has # relevant sections renamed as per the linker script. quiet_cmd_barebox-modpost = LD $@ cmd_barebox-modpost = $(LD) $(LDFLAGS) -r -o $@ \ $(vmlinux-init) --start-group $(barebox-main) --end-group \ $(filter-out $(barebox-init) $(barebox-main) $(barebox-lds) FORCE ,$^) define rule_barebox-modpost : +$(call cmd,barebox-modpost) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost $@ $(Q)echo 'cmd_$@ := $(cmd_barebox-modpost)' > $(dot-target).cmd endef OBJCOPYFLAGS_barebox.bin = -O binary barebox.bin: barebox FORCE $(call if_changed,objcopy) ifndef CONFIG_PBL_IMAGE $(call cmd,check_file_size,$@,$(CONFIG_BAREBOX_MAX_IMAGE_SIZE)) endif # By default the uImage load address is 2MB below CONFIG_TEXT_BASE, # leaving space for the compressed PBL image at 1MB below CONFIG_TEXT_BASE. UIMAGE_BASE ?= $(shell printf "0x%08x" $$(($(CONFIG_TEXT_BASE) - 0x200000))) # For development provide a target which makes barebox loadable by an # unmodified u-boot quiet_cmd_barebox_mkimage = MKIMAGE $@ cmd_barebox_mkimage = $(srctree)/scripts/mkimage -A $(ARCH) -T firmware -C none \ -O barebox -a $(UIMAGE_BASE) -e $(UIMAGE_BASE) \ -n "barebox $(KERNELRELEASE)" -d $< $@ # barebox.uimage is build from the raw barebox binary, without any other # headers. barebox.uimage: $(KBUILD_BINARY) FORCE $(call if_changed,barebox_mkimage) ifdef CONFIG_X86 barebox.S barebox.s: barebox ifdef CONFIG_X86_HDBOOT @echo "-------------------------------------------------" > barebox.S @echo " * MBR content" >> barebox.S $(Q)$(OBJDUMP) -j .bootsector -mi8086 -d barebox >> barebox.S @echo "-------------------------------------------------" >> barebox.S @echo " * Boot loader content" >> barebox.S $(Q)$(OBJDUMP) -j .bootstrapping -mi8086 -d barebox >> barebox.S endif @echo "-------------------------------------------------" >> barebox.S @echo " * Regular Text content" >> barebox.S $(Q)$(OBJDUMP) -j .text -d barebox >> barebox.S @echo "-------------------------------------------------" >> barebox.S @echo " * Regular Data content" >> barebox.S $(Q)$(OBJDUMP) -j .data -d barebox >> barebox.S @echo "-------------------------------------------------" >> barebox.S @echo " * Commands content" >> barebox.S $(Q)$(OBJDUMP) -j .barebox_cmd -d barebox >> barebox.S @echo "-------------------------------------------------" >> barebox.S @echo " * Init Calls content" >> barebox.S $(Q)$(OBJDUMP) -j .barebox_initcalls -d barebox >> barebox.S else barebox.S barebox.s: barebox FORCE $(call if_changed,disasm) endif # barebox image barebox: $(barebox-lds) $(barebox-head) $(barebox-common) $(kallsyms.o) FORCE $(call barebox-modpost) $(call if_changed_rule,barebox__) $(Q)rm -f .old_version barebox.srec: barebox $(OBJCOPY) -O srec $< $@ # The actual objects are generated when descending, # make sure no implicit rule kicks in $(sort $(barebox-head) $(barebox-common) ) $(barebox-lds) $(barebox-pbl-common): $(barebox-dirs) ; # Handle descending into subdirectories listed in $(barebox-dirs) # Preset locale variables to speed up the build process. Limit locale # tweaks to this spot to avoid wrong language settings when running # make menuconfig etc. # Error messages still appears in the original language PHONY += $(barebox-dirs) $(barebox-dirs): prepare scripts $(Q)$(MAKE) $(build)=$@ # Store (new) KERNELRELASE string in include/config/kernel.release localversion = $(shell $(srctree)/scripts/setlocalversion $(srctree)) include/config/kernel.release: include/config/auto.conf FORCE $(Q)rm -f $@ $(Q)echo $(KERNELVERSION)$(localversion) > $@ # Things we need to do before we recursively start building the kernel # or the modules are listed in "prepare". # A multi level approach is used. prepareN is processed before prepareN-1. # archprepare is used in arch Makefiles and when processed asm symlink, # version.h and scripts_basic is processed / created. # Listed in dependency order PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3 # prepare-all is deprecated, use prepare as valid replacement PHONY += prepare-all # prepare3 is used to check if we are building in a separate output directory, # and if so do: # 1) Check that make has not been executed in the kernel src $(srctree) prepare3: include/config/kernel.release ifneq ($(KBUILD_SRC),) @echo ' Using $(srctree) as source for kernel' $(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \ echo " $(srctree) is not clean, please run 'make mrproper'";\ echo " in the '$(srctree)' directory.";\ false; \ fi; endif # prepare2 creates a makefile if using a separate output directory prepare2: prepare3 outputmakefile prepare1: prepare2 include/generated/version.h include/generated/utsrelease.h \ include/config.h include/config/auto.conf ifneq ($(KBUILD_MODULES),) $(Q)mkdir -p $(MODVERDIR) $(Q)rm -f $(MODVERDIR)/* endif archprepare: prepare1 scripts_basic prepare0: archprepare FORCE $(Q)$(MAKE) $(build)=. # All the preparing.. prepare prepare-all: prepare0 # Leave this as default for preprocessing barebox.lds.S, which is now # done in arch/$(ARCH)/kernel/Makefile export CPPFLAGS_barebox.lds += -C -U$(ARCH) define symlink-config-h if [ -f $(srctree)/$(BOARD)/config.h ]; then \ $(kecho) ' SYMLINK $@ -> $(BOARD)/config.h'; \ ln -fsn $(srctree)/$(BOARD)/config.h $@; \ else \ [ -h $@ ] && rm -f $@; \ $(kecho) ' CREATE $@'; \ touch -a $@; \ fi endef include/config.h: include/config/auto.conf $(Q)$(symlink-config-h) # Generate some files # --------------------------------------------------------------------------- # KERNELRELEASE can change from a few different places, meaning version.h # needs to be updated, so this check is forced on all builds uts_len := 64 define filechk_utsrelease.h if [ `echo -n "$(KERNELRELEASE)" | wc -c ` -gt $(uts_len) ]; then \ echo '"$(KERNELRELEASE)" exceeds $(uts_len) characters' >&2; \ exit 1; \ fi; \ (echo \#define UTS_RELEASE \"$(KERNELRELEASE)\";) endef define filechk_version.h (echo \#define LINUX_VERSION_CODE $(shell \ expr $(VERSION) \* 65536 + $(PATCHLEVEL) \* 256 + $(SUBLEVEL)); \ echo '#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))';) endef include/generated/version.h: $(srctree)/Makefile FORCE $(call filechk,version.h) include/generated/utsrelease.h: include/config/kernel.release FORCE $(call filechk,utsrelease.h) # --------------------------------------------------------------------------- PHONY += depend dep depend dep: @echo '*** Warning: make $@ is unnecessary now.' # --------------------------------------------------------------------------- # Modules ifdef CONFIG_MODULES # By default, build modules as well all: modules # Build modules PHONY += modules modules: $(barebox-dirs) $(if $(KBUILD_BUILTIN),barebox) @$(kecho) ' Building modules, stage 2.'; $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost # Target to prepare building external modules PHONY += modules_prepare modules_prepare: prepare scripts # Target to install modules PHONY += modules_install modules_install: _modinst_ _modinst_post PHONY += _modinst_ _modinst_: @if [ -z "`$(DEPMOD) -V 2>/dev/null | grep module-init-tools`" ]; then \ echo "Warning: you may need to install module-init-tools"; \ echo "See http://www.codemonkey.org.uk/docs/post-halloween-2.6.txt";\ sleep 1; \ fi @rm -rf $(MODLIB)/kernel @rm -f $(MODLIB)/source @mkdir -p $(MODLIB)/kernel @ln -s $(srctree) $(MODLIB)/source @if [ ! $(objtree) -ef $(MODLIB)/build ]; then \ rm -f $(MODLIB)/build ; \ ln -s $(objtree) $(MODLIB)/build ; \ fi $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst # If System.map exists, run depmod. This deliberately does not have a # dependency on System.map since that would run the dependency tree on # vmlinux. This depmod is only for convenience to give the initial # boot a modules.dep even before / is mounted read-write. However the # boot script depmod is the master version. ifeq "$(strip $(INSTALL_MOD_PATH))" "" depmod_opts := else depmod_opts := -b $(INSTALL_MOD_PATH) -r endif PHONY += _modinst_post _modinst_post: _modinst_ if [ -r System.map -a -x $(DEPMOD) ]; then $(DEPMOD) -ae -F System.map $(depmod_opts) $(KERNELRELEASE); fi else # CONFIG_MODULES # Modules not configured # --------------------------------------------------------------------------- modules modules_install: FORCE @echo @echo "The present kernel configuration has modules disabled." @echo "Type 'make config' and enable loadable module support." @echo "Then build a kernel with module support enabled." @echo @exit 1 endif # CONFIG_MODULES ### # Cleaning is done on three levels. # make clean Delete most generated files # Leave enough to build external modules # make mrproper Delete the current configuration, and all generated files # make distclean Remove editor backup files, patch leftover files and the like # Directories & files removed with 'make clean' CLEAN_DIRS += $(MODVERDIR) CLEAN_FILES += barebox System.map include/generated/barebox_default_env.h \ .tmp_version .tmp_barebox* barebox.bin barebox.map barebox.S \ .tmp_kallsyms* barebox.ldr \ scripts/bareboxenv-target barebox-flash-image \ barebox.srec barebox.s5p barebox.ubl barebox.zynq \ barebox.uimage barebox.spi barebox.kwb barebox.kwbuart \ barebox.efi barebox.canon-a1100.bin # Directories & files removed with 'make mrproper' MRPROPER_DIRS += include/config usr/include include/generated Documentation/commands MRPROPER_FILES += .config .config.old .version .old_version \ include/config.h \ Module.symvers tags TAGS cscope* # clean - Delete most, but leave enough to build external modules # clean: rm-dirs := $(CLEAN_DIRS) clean: rm-files := $(CLEAN_FILES) clean-dirs := $(addprefix _clean_,$(srctree) $(barebox-alldirs)) PHONY += $(clean-dirs) clean archclean $(clean-dirs): $(Q)$(MAKE) $(clean)=images $(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@) clean: archclean $(clean-dirs) $(call cmd,rmdirs) $(call cmd,rmfiles) @find . $(RCS_FIND_IGNORE) \ \( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \ -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \ -o -name '*.symtypes' -o -name '*.bbenv.*' -o -name "*.bbenv" \) \ -type f -print | xargs rm -f # mrproper - Delete all generated files, including .config # mrproper: rm-dirs := $(wildcard $(MRPROPER_DIRS)) mrproper: rm-files := $(wildcard $(MRPROPER_FILES)) mrproper-dirs := $(addprefix _mrproper_,scripts) PHONY += $(mrproper-dirs) mrproper archmrproper $(mrproper-dirs): $(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@) mrproper: clean archmrproper $(mrproper-dirs) $(call cmd,rmdirs) $(call cmd,rmfiles) # distclean # PHONY += distclean distclean: mrproper @find $(srctree) $(RCS_FIND_IGNORE) \ \( -name '*.orig' -o -name '*.rej' -o -name '*~' \ -o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \ -o -name '.*.rej' -o -size 0 \ -o -name '*%' -o -name '.*.cmd' -o -name 'core' \) \ -type f -print | xargs rm -f # Packaging of the kernel to various formats # --------------------------------------------------------------------------- # rpm target kept for backward compatibility package-dir := $(srctree)/scripts/package %pkg: include/config/kernel.release FORCE $(Q)$(MAKE) $(build)=$(package-dir) $@ rpm: include/config/kernel.release FORCE $(Q)$(MAKE) $(build)=$(package-dir) $@ # Brief documentation of the typical targets used # --------------------------------------------------------------------------- boards := $(wildcard $(srctree)/arch/$(ARCH)/configs/*_defconfig) boards := $(notdir $(boards)) help: @echo 'Cleaning targets:' @echo ' clean - Remove most generated files but keep the config and' @echo ' enough build support to build external modules' @echo ' mrproper - Remove all generated files + config + various backup files' @echo ' distclean - mrproper + remove editor backup and patch files' @echo ' docs - build documentation' @echo '' @echo 'Configuration targets:' @$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help @echo '' @echo 'Other generic targets:' @echo ' all - Build all targets marked with [*]' @echo '* barebox - Build the bare kernel' @echo ' dir/ - Build all files in dir and below' @echo ' dir/file.[ois] - Build specified target only' @echo ' dir/file.ko - Build module including final link' @echo ' tags/TAGS - Generate tags file for editors' @echo ' cscope - Generate cscope index' @echo ' (default: $(INSTALL_HDR_PATH))' @echo '' @echo 'Static analysers' @echo ' checkstack - Generate a list of stack hogs' @echo ' namespacecheck - Name space analysis on compiled kernel' @if [ -r include/asm-$(ARCH)/Kbuild ]; then \ echo ' headers_check - Sanity check on exported headers'; \ fi @echo '' @echo 'Architecture specific targets ($(ARCH)):' @$(if $(archhelp),$(archhelp),\ echo ' No architecture specific help defined for $(ARCH)') @echo '' @$(if $(boards), \ $(foreach b, $(boards), \ printf " %-24s - Build for %s\\n" $(b) $(subst _defconfig,,$(b));) \ echo '') @echo ' make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build' @echo ' make V=2 [targets] 2 => give reason for rebuild of target' @echo ' make O=dir [targets] Locate all output files in "dir", including .config' @echo ' make C=1 [targets] Check all c source with $$CHECK (sparse by default)' @echo ' make C=2 [targets] Force check of all c source with $$CHECK' @echo '' @echo 'Execute "make" or "make all" to build all targets marked with [*] ' @echo 'For further info see the ./README file' # Generate tags for editors # --------------------------------------------------------------------------- quiet_cmd_tags = GEN $@ cmd_tags = $(CONFIG_SHELL) $(srctree)/scripts/tags.sh $@ tags TAGS cscope: FORCE $(call cmd,tags) SPHINXBUILD = sphinx-build ALLSPHINXOPTS = source docs: FORCE @mkdir -p $(srctree)/Documentation/commands @$(srctree)/Documentation/gen_commands.py $(srctree) $(srctree)/Documentation/commands @$(SPHINXBUILD) -b html -d $(objtree)/doctrees $(srctree)/Documentation \ $(objtree)/Documentation/html endif #ifeq ($(config-targets),1) endif #ifeq ($(mixed-targets),1) # Single targets # --------------------------------------------------------------------------- # Single targets are compatible with: # - build with mixed source and output # - build with separate output dir 'make O=...' # - external modules # # target-dir => where to store outputfile # build-dir => directory in kernel source tree to use build-dir = $(patsubst %/,%,$(dir $@)) target-dir = $(dir $@) %.s: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.i: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.o: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.lst: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.s: %.S prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.o: %.S prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) %.symtypes: %.c prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@) # Modules %/: prepare scripts FORCE $(Q)$(MAKE) $(build)=$(build-dir) %.ko: prepare scripts FORCE $(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \ $(build)=$(build-dir) $(@:.ko=.o) $(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost # FIXME Should go into a make.lib or something # =========================================================================== quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN $(wildcard $(rm-dirs))) cmd_rmdirs = rm -rf $(rm-dirs) quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN $(wildcard $(rm-files))) cmd_rmfiles = rm -f $(rm-files) a_flags = -Wp,-MD,$(depfile) $(AFLAGS) $(AFLAGS_KERNEL) \ $(NOSTDINC_FLAGS) $(CPPFLAGS) \ $(modkern_aflags) $(EXTRA_AFLAGS) $(AFLAGS_$(basetarget).o) quiet_cmd_as_o_S = AS $@ cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< # read all saved command lines targets := $(wildcard $(sort $(targets))) cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd)) ifneq ($(cmd_files),) $(cmd_files): ; # Do not try to update included dependency files include $(cmd_files) endif # Shorthand for $(Q)$(MAKE) -f scripts/Makefile.clean obj=dir # Usage: # $(Q)$(MAKE) $(clean)=dir clean := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.clean obj endif # skip-makefile PHONY += FORCE FORCE: # Cancel implicit rules on top Makefile, `-rR' will apply to sub-makes. Makefile: ; # Declare the contents of the .PHONY variable as phony. We keep that # information in a variable so we can use it in if_changed and friends. .PHONY: $(PHONY)