# 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)

obj-y := $(patsubst %/, %/built-in.a, $(obj-y))

obj-m := $(filter-out %/, $(obj-m))

# Subdirectories we need to descend into

subdir-ym := $(sort $(subdir-y) $(subdir-m))

# if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object

multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))

multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))

multi-used := $(multi-used-y) $(multi-used-m)

single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-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=-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=-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))

single-used-m := $(addprefix $(obj)/,$(single-used-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, all of them are

# concatenated with a colon separator.

modname-multi = $(subst $(space),:,$(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))

# 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 = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)

basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))

modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))

orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \

$(ccflags-y) $(CFLAGS_$(basetarget).o)

_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))

orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \

$(asflags-y) $(AFLAGS_$(basetarget).o)

_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))

_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))

#

# 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),)

ifneq ($(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

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

# LEX

# ---------------------------------------------------------------------------

quiet_cmd_flex = LEX $@

cmd_flex = $(LEX) -o$@ -L $<

$(obj)/%.lex.c: $(src)/%.l FORCE

$(call if_changed,flex)

# YACC

# ---------------------------------------------------------------------------

quiet_cmd_bison = YACC $@

cmd_bison = $(YACC) -o$@ -t -l $<

$(obj)/%.tab.c: $(src)/%.y FORCE

$(call if_changed,bison)

quiet_cmd_bison_h = YACC $@

cmd_bison_h = $(YACC) -o/dev/null --defines=$@ -t -l $<

$(obj)/%.tab.h: $(src)/%.y FORCE

$(call if_changed,bison_h)

# 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 $@; $(AR) rcsTP$(KBUILD_ARFLAGS) $@ $(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_ENABLE_EXTRA_GCC_CHECKS)),)

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_ENABLE_EXTRA_GCC_CHECKS)),)

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 = $(CONFIG_SHELL) $(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