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- # SPDX-License-Identifier: GPL-2.0
- # Backward compatibility
- asflags-y += $(EXTRA_AFLAGS)
- ccflags-y += $(EXTRA_CFLAGS)
- cppflags-y += $(EXTRA_CPPFLAGS)
- ldflags-y += $(EXTRA_LDFLAGS)
- ifneq ($(always),)
- $(warning 'always' is deprecated. Please use 'always-y' instead)
- always-y += $(always)
- endif
- ifneq ($(hostprogs-y),)
- $(warning 'hostprogs-y' is deprecated. Please use 'hostprogs' instead)
- hostprogs += $(hostprogs-y)
- endif
- ifneq ($(hostprogs-m),)
- $(warning 'hostprogs-m' is deprecated. Please use 'hostprogs' instead)
- hostprogs += $(hostprogs-m)
- endif
- # flags that take effect in current and sub directories
- KBUILD_AFLAGS += $(subdir-asflags-y)
- KBUILD_CFLAGS += $(subdir-ccflags-y)
- # Figure out what we need to build from the various variables
- # ===========================================================================
- # When an object is listed to be built compiled-in and modular,
- # only build the compiled-in version
- obj-m := $(filter-out $(obj-y),$(obj-m))
- # Libraries are always collected in one lib file.
- # Filter out objects already built-in
- lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
- # Subdirectories we need to descend into
- subdir-ym := $(sort $(subdir-y) $(subdir-m) \
- $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m))))
- # Handle objects in subdirs:
- # - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and
- # foo/modules.order
- # - If we encounter foo/ in $(obj-m), replace it by foo/modules.order
- #
- # Generate modules.order to determine modorder. Unfortunately, we don't have
- # information about ordering between -y and -m subdirs. Just put -y's first.
- ifdef need-modorder
- obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m))
- else
- obj-m := $(filter-out %/, $(obj-m))
- endif
- ifdef need-builtin
- obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
- else
- obj-y := $(filter-out %/, $(obj-y))
- endif
- # Expand $(foo-objs) $(foo-y) by calling $(call suffix-search,foo.o,-objs -y)
- suffix-search = $(foreach s,$(2),$($(1:.o=$s)))
- # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
- # Do this recursively to find nested composite objects.
- # foo-y may contain foo.o bar.o . For backwards compatibility, don't treat this
- # foo.o as a nested object
- multi-search = $(sort $(foreach m,$(1),$(if $(strip $(call suffix-search,$(m),$(2) -)),\
- $(if $(filter $(m),$(strip $(call suffix-search,$(m),$(2) -))),,\
- $(m) $(call multi-search,$(call suffix-search,$(m),$(2)),$(2))))))
- multi-used-y := $(call multi-search,$(obj-y),-objs -y)
- multi-used-m := $(call multi-search,$(obj-m),-objs -y -m)
- multi-used := $(multi-used-y) $(multi-used-m)
- # Replace multi-part objects by their individual parts,
- # including built-in.a from subdirectories
- # Recursively search for real files. For backwards compatibility,
- # foo-y may contain foo.o bar.o . foo.o in this context is a real object, and
- # shouldn't be recursed into.
- real-search = $(foreach m,$(1), $(if $(strip $(call suffix-search,$(m),$(2) -)), \
- $(filter $(m),$(call suffix-search,$(m),$(2))) $(call real-search,$(filter-out $(m),$(call suffix-search,$(m),$(2))),$(2)),\
- $(m)))
- real-obj-y := $(call real-search, $(obj-y),-objs -y)
- real-obj-m := $(call real-search, $(obj-m),-objs -y -m)
- always-y += $(always-m)
- # hostprogs-always-y += foo
- # ... is a shorthand for
- # hostprogs += foo
- # always-y += foo
- hostprogs += $(hostprogs-always-y) $(hostprogs-always-m)
- always-y += $(hostprogs-always-y) $(hostprogs-always-m)
- # userprogs-always-y is likewise.
- userprogs += $(userprogs-always-y) $(userprogs-always-m)
- always-y += $(userprogs-always-y) $(userprogs-always-m)
- # DTB
- # If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
- extra-y += $(dtb-y)
- extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
- ifneq ($(CHECK_DTBS),)
- extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
- extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
- endif
- # Add subdir path
- extra-y := $(addprefix $(obj)/,$(extra-y))
- always-y := $(addprefix $(obj)/,$(always-y))
- targets := $(addprefix $(obj)/,$(targets))
- obj-m := $(addprefix $(obj)/,$(obj-m))
- lib-y := $(addprefix $(obj)/,$(lib-y))
- real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
- real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
- multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
- subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
- # Finds the multi-part object the current object will be linked into.
- # If the object belongs to two or more multi-part objects, list them all.
- modname-multi = $(sort $(foreach m,$(multi-used),\
- $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=))))
- __modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
- modname = $(subst $(space),:,$(__modname))
- modfile = $(addprefix $(obj)/,$(__modname))
- # target with $(obj)/ and its suffix stripped
- target-stem = $(basename $(patsubst $(obj)/%,%,$@))
- # These flags are needed for modversions and compiling, so we define them here
- # $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
- # end up in (or would, if it gets compiled in)
- name-fix-token = $(subst $(comma),_,$(subst -,_,$1))
- name-fix = $(call stringify,$(call name-fix-token,$1))
- basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
- modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \
- -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname))
- modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile))
- _c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \
- $(filter-out $(ccflags-remove-y), \
- $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \
- $(CFLAGS_$(target-stem).o))
- _a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \
- $(filter-out $(asflags-remove-y), \
- $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \
- $(AFLAGS_$(target-stem).o))
- _cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
- #
- # Enable gcov profiling flags for a file, directory or for all files depending
- # on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
- # (in this order)
- #
- ifeq ($(CONFIG_GCOV_KERNEL),y)
- _c_flags += $(if $(patsubst n%,, \
- $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
- $(CFLAGS_GCOV))
- endif
- #
- # Enable address sanitizer flags for kernel except some files or directories
- # we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
- #
- ifeq ($(CONFIG_KASAN),y)
- ifneq ($(CONFIG_KASAN_HW_TAGS),y)
- _c_flags += $(if $(patsubst n%,, \
- $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
- $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
- endif
- endif
- ifeq ($(CONFIG_UBSAN),y)
- _c_flags += $(if $(patsubst n%,, \
- $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
- $(CFLAGS_UBSAN))
- endif
- ifeq ($(CONFIG_KCOV),y)
- _c_flags += $(if $(patsubst n%,, \
- $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
- $(CFLAGS_KCOV))
- endif
- #
- # Enable KCSAN flags except some files or directories we don't want to check
- # (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE)
- #
- ifeq ($(CONFIG_KCSAN),y)
- _c_flags += $(if $(patsubst n%,, \
- $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \
- $(CFLAGS_KCSAN))
- endif
- # $(srctree)/$(src) for including checkin headers from generated source files
- # $(objtree)/$(obj) for including generated headers from checkin source files
- ifeq ($(KBUILD_EXTMOD),)
- ifdef building_out_of_srctree
- _c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
- _a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
- _cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
- endif
- endif
- part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
- quiet_modtag = $(if $(part-of-module),[M], )
- modkern_cflags = \
- $(if $(part-of-module), \
- $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
- $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags))
- modkern_aflags = $(if $(part-of-module), \
- $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
- $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
- c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
- -include $(srctree)/include/linux/compiler_types.h \
- $(_c_flags) $(modkern_cflags) \
- $(basename_flags) $(modname_flags)
- a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
- $(_a_flags) $(modkern_aflags)
- cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
- $(_cpp_flags)
- ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
- DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
- dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \
- $(addprefix -I,$(DTC_INCLUDE)) \
- -undef -D__DTS__
- # Objtool arguments are also needed for modfinal with LTO, so we define
- # then here to avoid duplication.
- objtool_args = \
- $(if $(CONFIG_UNWINDER_ORC),orc generate,check) \
- $(if $(part-of-module), --module,) \
- $(if $(CONFIG_FRAME_POINTER),, --no-fp) \
- $(if $(or $(CONFIG_GCOV_KERNEL),$(CONFIG_LTO_CLANG)), \
- --no-unreachable,) \
- $(if $(CONFIG_RETPOLINE), --retpoline,) \
- $(if $(CONFIG_X86_SMAP), --uaccess,) \
- $(if $(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL), --mcount,)
- # Useful for describing the dependency of composite objects
- # Usage:
- # $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
- define multi_depend
- $(foreach m, $(notdir $1), \
- $(eval $(obj)/$m: \
- $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
- endef
- quiet_cmd_copy = COPY $@
- cmd_copy = cp $< $@
- # Shipped files
- # ===========================================================================
- quiet_cmd_shipped = SHIPPED $@
- cmd_shipped = cat $< > $@
- $(obj)/%: $(src)/%_shipped
- $(call cmd,shipped)
- # Commands useful for building a boot image
- # ===========================================================================
- #
- # Use as following:
- #
- # target: source(s) FORCE
- # $(if_changed,ld/objcopy/gzip)
- #
- # and add target to extra-y so that we know we have to
- # read in the saved command line
- # Linking
- # ---------------------------------------------------------------------------
- quiet_cmd_ld = LD $@
- cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
- # Archive
- # ---------------------------------------------------------------------------
- quiet_cmd_ar = AR $@
- cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
- # Objcopy
- # ---------------------------------------------------------------------------
- quiet_cmd_objcopy = OBJCOPY $@
- cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
- # Gzip
- # ---------------------------------------------------------------------------
- quiet_cmd_gzip = GZIP $@
- cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@
- # DTC
- # ---------------------------------------------------------------------------
- ifeq ("$(origin DTC)", "command line")
- PHONY += $(DTC)
- dtc-option = $(call try-run, $(DTC) $1 -v,$1)
- else
- # Just add the flag. DTC is compiled later as a prerequisite, so there's no dtc
- # to test the flag against. This is okay because we're not testing flags which
- # aren't supported by in-kernel dtc to begin with.
- dtc-option = $1
- endif
- DTC ?= $(objtree)/scripts/dtc/dtc
- DTC_FLAGS += $(call dtc-option,-Wno-interrupt_provider)
- # Disable noisy checks by default
- ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
- DTC_FLAGS += $(call dtc-option,-Wno-unit_address_vs_reg) \
- $(call dtc-option,-Wno-unit_address_format) \
- $(call dtc-option,-Wno-avoid_unnecessary_addr_size) \
- $(call dtc-option,-Wno-alias_paths) \
- $(call dtc-option,-Wno-graph_child_address) \
- $(call dtc-option,-Wno-simple_bus_reg) \
- $(call dtc-option,-Wno-unique_unit_address) \
- $(call dtc-option,-Wno-pci_device_reg)
- endif
- ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
- DTC_FLAGS += $(call dtc-option,-Wnode_name_chars_strict) \
- $(call dtc-option,-Wproperty_name_chars_strict) \
- $(call dtc-option,-Winterrupt_provider)
- endif
- DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
- # Generate an assembly file to wrap the output of the device tree compiler
- quiet_cmd_dt_S_dtb= DTB $@
- cmd_dt_S_dtb= \
- { \
- echo '\#include <asm-generic/vmlinux.lds.h>'; \
- echo '.section .dtb.init.rodata,"a"'; \
- echo '.balign STRUCT_ALIGNMENT'; \
- echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
- echo '__dtb_$(subst -,_,$(*F))_begin:'; \
- echo '.incbin "$<" '; \
- echo '__dtb_$(subst -,_,$(*F))_end:'; \
- echo '.global __dtb_$(subst -,_,$(*F))_end'; \
- echo '.balign STRUCT_ALIGNMENT'; \
- } > $@
- $(obj)/%.dtb.S: $(obj)/%.dtb FORCE
- $(call if_changed,dt_S_dtb)
- quiet_cmd_dtc = DTC $@
- cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
- $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \
- $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
- -d $(depfile).dtc.tmp $(dtc-tmp) ; \
- cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
- $(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
- $(call if_changed_dep,dtc)
- DT_CHECKER ?= dt-validate
- DT_BINDING_DIR := Documentation/devicetree/bindings
- # DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile
- DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.json
- quiet_cmd_dtb_check = CHECK $@
- cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@
- define rule_dtc
- $(call cmd_and_fixdep,dtc)
- $(call cmd,dtb_check)
- endef
- $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
- $(call if_changed_rule,dtc,yaml)
- dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
- # Bzip2
- # ---------------------------------------------------------------------------
- # Bzip2 and LZMA do not include size in file... so we have to fake that;
- # append the size as a 32-bit littleendian number as gzip does.
- size_append = printf $(shell \
- dec_size=0; \
- for F in $(real-prereqs); do \
- fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
- dec_size=$$(expr $$dec_size + $$fsize); \
- done; \
- printf "%08x\n" $$dec_size | \
- sed 's/\(..\)/\1 /g' | { \
- read ch0 ch1 ch2 ch3; \
- for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
- printf '%s%03o' '\\' $$((0x$$ch)); \
- done; \
- } \
- )
- quiet_cmd_bzip2 = BZIP2 $@
- cmd_bzip2 = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@
- # Lzma
- # ---------------------------------------------------------------------------
- quiet_cmd_lzma = LZMA $@
- cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@
- quiet_cmd_lzo = LZO $@
- cmd_lzo = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@
- quiet_cmd_lz4 = LZ4 $@
- cmd_lz4 = { cat $(real-prereqs) | \
- $(LZ4) -l -12 --favor-decSpeed stdin stdout; \
- $(size_append); } > $@
- # U-Boot mkimage
- # ---------------------------------------------------------------------------
- MKIMAGE := $(srctree)/scripts/mkuboot.sh
- # SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
- # the number of overrides in arch makefiles
- UIMAGE_ARCH ?= $(SRCARCH)
- UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
- UIMAGE_OPTS-y ?=
- UIMAGE_TYPE ?= kernel
- UIMAGE_LOADADDR ?= arch_must_set_this
- UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
- UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
- quiet_cmd_uimage = UIMAGE $@
- cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
- -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
- -T $(UIMAGE_TYPE) \
- -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
- -n $(UIMAGE_NAME) -d $< $@
- # XZ
- # ---------------------------------------------------------------------------
- # Use xzkern to compress the kernel image and xzmisc to compress other things.
- #
- # xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
- # of the kernel decompressor. A BCJ filter is used if it is available for
- # the target architecture. xzkern also appends uncompressed size of the data
- # using size_append. The .xz format has the size information available at
- # the end of the file too, but it's in more complex format and it's good to
- # avoid changing the part of the boot code that reads the uncompressed size.
- # Note that the bytes added by size_append will make the xz tool think that
- # the file is corrupt. This is expected.
- #
- # xzmisc doesn't use size_append, so it can be used to create normal .xz
- # files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
- # big dictionary would increase the memory usage too much in the multi-call
- # decompression mode. A BCJ filter isn't used either.
- quiet_cmd_xzkern = XZKERN $@
- cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \
- $(size_append); } > $@
- quiet_cmd_xzmisc = XZMISC $@
- cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
- # ZSTD
- # ---------------------------------------------------------------------------
- # Appends the uncompressed size of the data using size_append. The .zst
- # format has the size information available at the beginning of the file too,
- # but it's in a more complex format and it's good to avoid changing the part
- # of the boot code that reads the uncompressed size.
- #
- # Note that the bytes added by size_append will make the zstd tool think that
- # the file is corrupt. This is expected.
- #
- # zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of
- # 128 MB. zstd22 is used for kernel compression because it is decompressed in a
- # single pass, so zstd doesn't need to allocate a window buffer. When streaming
- # decompression is used, like initramfs decompression, zstd22 should likely not
- # be used because it would require zstd to allocate a 128 MB buffer.
- quiet_cmd_zstd = ZSTD $@
- cmd_zstd = { cat $(real-prereqs) | $(ZSTD) -19; $(size_append); } > $@
- quiet_cmd_zstd22 = ZSTD22 $@
- cmd_zstd22 = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@
- # ASM offsets
- # ---------------------------------------------------------------------------
- # Default sed regexp - multiline due to syntax constraints
- #
- # Use [:space:] because LLVM's integrated assembler inserts <tab> around
- # the .ascii directive whereas GCC keeps the <space> as-is.
- define sed-offsets
- 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \
- /^->/{s:->#\(.*\):/* \1 */:; \
- s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \
- s:->::; p;}'
- endef
- # Use filechk to avoid rebuilds when a header changes, but the resulting file
- # does not
- define filechk_offsets
- echo "#ifndef $2"; \
- echo "#define $2"; \
- echo "/*"; \
- echo " * DO NOT MODIFY."; \
- echo " *"; \
- echo " * This file was generated by Kbuild"; \
- echo " */"; \
- echo ""; \
- sed -ne $(sed-offsets) < $<; \
- echo ""; \
- echo "#endif"
- endef
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