| # SPDX-License-Identifier: GPL-2.0 |
| # Backward compatibility |
| asflags-y += $(EXTRA_AFLAGS) |
| ccflags-y += $(EXTRA_CFLAGS) |
| cppflags-y += $(EXTRA_CPPFLAGS) |
| ldflags-y += $(EXTRA_LDFLAGS) |
| |
| # 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))) |
| |
| # Determine modorder. |
| # Unfortunately, we don't have information about ordering between -y |
| # and -m subdirs. Just put -y's first. |
| modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) |
| |
| # Handle objects in subdirs |
| # --------------------------------------------------------------------------- |
| # o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a |
| # and add the directory to the list of dirs to descend into: $(subdir-y) |
| # o if we encounter foo/ in $(obj-m), remove it from $(obj-m) |
| # and add the directory to the list of dirs to descend into: $(subdir-m) |
| __subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) |
| subdir-y += $(__subdir-y) |
| __subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) |
| subdir-m += $(__subdir-m) |
| ifdef need-builtin |
| obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) |
| else |
| obj-y := $(filter-out %/, $(obj-y)) |
| endif |
| obj-m := $(filter-out %/, $(obj-m)) |
| |
| # Subdirectories we need to descend into |
| subdir-ym := $(sort $(subdir-y) $(subdir-m)) |
| |
| # If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object |
| multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m)))) |
| multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m)))) |
| multi-used := $(multi-used-y) $(multi-used-m) |
| |
| # $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to |
| # tell kbuild to descend |
| subdir-obj-y := $(filter %/built-in.a, $(obj-y)) |
| |
| # Replace multi-part objects by their individual parts, |
| # including built-in.a from subdirectories |
| real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) |
| real-obj-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)),$(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 := $(addprefix $(obj)/,$(always)) |
| targets := $(addprefix $(obj)/,$(targets)) |
| modorder := $(addprefix $(obj)/,$(modorder)) |
| obj-m := $(addprefix $(obj)/,$(obj-m)) |
| lib-y := $(addprefix $(obj)/,$(lib-y)) |
| subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-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 = $(call stringify,$(subst $(comma),_,$(subst -,_,$1))) |
| basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) |
| modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) |
| modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) |
| |
| orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \ |
| $(ccflags-y) $(CFLAGS_$(target-stem).o) |
| _c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags)) |
| orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \ |
| $(asflags-y) $(AFLAGS_$(target-stem).o) |
| _a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags)) |
| _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) |
| _c_flags += $(if $(patsubst n%,, \ |
| $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ |
| $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) |
| endif |
| |
| ifeq ($(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 |
| |
| # $(srctree)/$(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) $(AFLAGS_KERNEL)) |
| |
| c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| -include $(srctree)/include/linux/compiler_types.h \ |
| $(_c_flags) $(modkern_cflags) \ |
| $(basename_flags) $(modname_flags) |
| |
| a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| $(_a_flags) $(modkern_aflags) |
| |
| cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ |
| $(_cpp_flags) |
| |
| ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) |
| |
| DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes |
| |
| dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ |
| $(addprefix -I,$(DTC_INCLUDE)) \ |
| -undef -D__DTS__ |
| |
| # 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 |
| |
| # 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) | gzip -n -f -9 > $@ |
| |
| # DTC |
| # --------------------------------------------------------------------------- |
| DTC ?= $(objtree)/scripts/dtc/dtc |
| |
| # Disable noisy checks by default |
| ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) |
| DTC_FLAGS += -Wno-unit_address_vs_reg \ |
| -Wno-unit_address_format \ |
| -Wno-avoid_unnecessary_addr_size \ |
| -Wno-alias_paths \ |
| -Wno-graph_child_address \ |
| -Wno-simple_bus_reg \ |
| -Wno-unique_unit_address \ |
| -Wno-pci_device_reg |
| endif |
| |
| ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) |
| DTC_FLAGS += -Wnode_name_chars_strict \ |
| -Wproperty_name_chars_strict |
| 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 = mkdir -p $(dir ${dtc-tmp}) ; \ |
| $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ |
| $(DTC) -O $(2) -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,dtb) |
| |
| DT_CHECKER ?= dt-validate |
| DT_BINDING_DIR := Documentation/devicetree/bindings |
| DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml |
| |
| quiet_cmd_dtb_check = CHECK $@ |
| cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ; |
| |
| define rule_dtc_dt_yaml |
| $(call cmd_and_fixdep,dtc,yaml) |
| $(call cmd,dtb_check) |
| endef |
| |
| $(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE |
| $(call if_changed_rule,dtc_dt_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) | bzip2 -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) | lzop -9; $(size_append); } > $@ |
| |
| quiet_cmd_lz4 = LZ4 $@ |
| cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 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 > $@ |
| |
| # 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 |