# SPDX-License-Identifier: GPL-2.0

# 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-obj-ym),\

$(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=))))

__modname = $(or $(modname-multi),$(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=$(call name-fix-token,$(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))

_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \

$(filter-out $(rustflags-remove-y), \

$(KBUILD_RUSTFLAGS) $(rustflags-y)) \

$(RUSTFLAGS_$(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%,, \

$(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(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%,, \

$(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \

$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))

_rust_flags += $(if $(patsubst n%,, \

$(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \

$(RUSTFLAGS_KASAN))

endif

endif

ifeq ($(CONFIG_KMSAN),y)

_c_flags += $(if $(patsubst n%,, \

$(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \

$(CFLAGS_KMSAN))

_c_flags += $(if $(patsubst n%,, \

$(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \

, -mllvm -msan-disable-checks=1)

endif

ifeq ($(CONFIG_UBSAN),y)

_c_flags += $(if $(patsubst n%,, \

$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \

$(CFLAGS_UBSAN))

_c_flags += $(if $(patsubst n%,, \

$(UBSAN_INTEGER_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_INTEGER_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \

$(CFLAGS_UBSAN_INTEGER_WRAP))

endif

ifeq ($(CONFIG_KCOV),y)

_c_flags += $(if $(patsubst n%,, \

$(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \

$(CFLAGS_KCOV))

_rust_flags += $(if $(patsubst n%,, \

$(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \

$(RUSTFLAGS_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%,, \

$(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \

$(CFLAGS_KCSAN))

# Some uninstrumented files provide implied barriers required to avoid false

# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only.

_c_flags += $(if $(patsubst n%,, \

$(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \

-D__KCSAN_INSTRUMENT_BARRIERS__)

endif

#

# Enable context analysis flags only where explicitly opted in.

# (depends on variables CONTEXT_ANALYSIS_obj.o, CONTEXT_ANALYSIS)

#

ifeq ($(CONFIG_WARN_CONTEXT_ANALYSIS),y)

_c_flags += $(if $(patsubst n%,, \

$(CONTEXT_ANALYSIS_$(target-stem).o)$(CONTEXT_ANALYSIS)$(if $(is-kernel-object),$(CONFIG_WARN_CONTEXT_ANALYSIS_ALL))), \

$(CFLAGS_CONTEXT_ANALYSIS))

endif

#

# Enable AutoFDO build flags except some files or directories we don't want to

# enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE).

#

ifeq ($(CONFIG_AUTOFDO_CLANG),y)

_c_flags += $(if $(patsubst n%,, \

$(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \

$(CFLAGS_AUTOFDO_CLANG))

endif

#

# Enable Propeller build flags except some files or directories we don't want to

# enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFILE).

#

ifdef CONFIG_PROPELLER_CLANG

_c_flags += $(if $(patsubst n%,, \

$(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE))$(is-kernel-object), \

$(CFLAGS_PROPELLER_CLANG))

endif

# $(src) for including checkin headers from generated source files

# $(obj) for including generated headers from checkin source files

ifdef building_out_of_srctree

_c_flags += $(addprefix -I, $(src) $(obj))

_a_flags += $(addprefix -I, $(src) $(obj))

_cpp_flags += $(addprefix -I, $(src) $(obj))

endif

# If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules

is-kernel-object = $(or $(part-of-builtin),$(part-of-module))

part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y)

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_rustflags = \

$(if $(part-of-module), \

$(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \

$(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL))

modkern_aflags = $(if $(part-of-module), \

$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \

$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags))

c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \

-include $(srctree)/include/linux/compiler_types.h \

$(_c_flags) $(modkern_cflags) \

$(basename_flags) $(modname_flags)

rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg

a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \

$(_a_flags) $(modkern_aflags) $(modname_flags)

cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \

$(_cpp_flags)

ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))

ifdef CONFIG_OBJTOOL

objtool := $(objtree)/tools/objtool/objtool

objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label

objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr

objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylake

objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt

objtool-args-$(CONFIG_FINEIBT) += --cfi

objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount

ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL

objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop

endif

objtool-args-$(CONFIG_UNWINDER_ORC) += --orc

objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline

objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk

objtool-args-$(CONFIG_MITIGATION_SLS) += --sls

objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval

objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call

objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess

objtool-args-$(or $(CONFIG_GCOV_KERNEL),$(CONFIG_KCOV)) += --no-unreachable

objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES)

objtool-args-$(CONFIG_OBJTOOL_WERROR) += --werror

objtool-args = $(objtool-args-y) \

$(if $(delay-objtool), --link) \

$(if $(part-of-module), --module)

delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT),$(CONFIG_KLP_BUILD))

cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@)

cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd)

objtool-enabled := y

endif # CONFIG_OBJTOOL

# 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, $1, \

$(eval $m: \

$(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3))))

endef

# Remove ".." and "." from a path, without using "realpath"

# Usage:

# $(call normalize_path,path/to/../file)

define normalize_path

$(strip $(eval elements :=) \

$(foreach elem,$(subst /, ,$1), \

$(if $(filter-out .,$(elem)), \

$(if $(filter ..,$(elem)), \

$(eval elements := $(wordlist 2,$(words $(elements)),x $(elements))), \

$(eval elements := $(elements) $(elem))))) \

$(subst $(space),/,$(elements)))

endef

# Build commands

# ===========================================================================

# These are shared by some Makefile.* files.

ifdef CONFIG_LTO_CLANG

# Run $(LD) here to convert LLVM IR to ELF in the following cases:

# - when this object needs objtool processing, as objtool cannot process LLVM IR

# - when this is a single-object module, as modpost cannot process LLVM IR

cmd_ld_single = $(if $(objtool-enabled)$(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@)

endif

quiet_cmd_cc_o_c = CC $(quiet_modtag) $@

cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \

$(cmd_ld_single) \

$(cmd_objtool)

define rule_cc_o_c

$(call cmd_and_fixdep,cc_o_c)

$(call cmd,checksrc)

$(call cmd,checkdoc)

$(call cmd,gen_objtooldep)

$(call cmd,gen_symversions_c)

$(call cmd,record_mcount)

$(call cmd,warn_shared_object)

endef

quiet_cmd_as_o_S = AS $(quiet_modtag) $@

cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool)

define rule_as_o_S

$(call cmd_and_fixdep,as_o_S)

$(call cmd,gen_objtooldep)

$(call cmd,gen_symversions_S)

$(call cmd,warn_shared_object)

endef

# Copy a file

# ===========================================================================

# 'cp' preserves permissions. If you use it to copy a file in read-only srctree,

# the copy would be read-only as well, leading to an error when executing the

# rule next time. Use 'cat' instead in order to generate a writable file.

quiet_cmd_copy = COPY $@

cmd_copy = cat $< > $@

$(obj)/%: $(src)/%_shipped

$(call cmd,copy)

# Touch a file

# ===========================================================================

quiet_cmd_touch = TOUCH $(call normalize_path,$@)

cmd_touch = touch $@

# Commands useful for building a boot image

# ===========================================================================

#

# Use as following:

#

# target: source(s) FORCE

# $(if_changed,ld/objcopy/gzip)

#

# and add target to 'targets' 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 > $@

# 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_file_size = GEN $@

cmd_file_size = $(size_append) > $@

quiet_cmd_bzip2 = BZIP2 $@

cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@

quiet_cmd_bzip2_with_size = BZIP2 $@

cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@

# Lzma

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

quiet_cmd_lzma = LZMA $@

cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@

quiet_cmd_lzma_with_size = LZMA $@

cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@

quiet_cmd_lzo = LZO $@

cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@

quiet_cmd_lzo_with_size = LZO $@

cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@

quiet_cmd_lz4 = LZ4 $@

cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@

quiet_cmd_lz4_with_size = LZ4 $@

cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \

$(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 ?= $(or $(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 $< $@

# Flat Image Tree (FIT)

# This allows for packaging of a kernel and all devicetrees files, using

# compression.

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

MAKE_FIT := $(srctree)/scripts/make_fit.py

# Use this to override the compression algorithm

FIT_COMPRESSION ?= gzip

quiet_cmd_fit = FIT $@

cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \

--name '$(UIMAGE_NAME)' $(FIT_EXTRA_ARGS) \

$(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \

$(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \

--compress $(FIT_COMPRESSION) -k $< @$(word 2,$^)

# XZ

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

# Use xzkern or xzkern_with_size 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_with_size 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 > $@

quiet_cmd_xzkern_with_size = XZKERN $@

cmd_xzkern_with_size = { 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 > $@

quiet_cmd_zstd22 = ZSTD22 $@

cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@

quiet_cmd_zstd22_with_size = ZSTD22 $@

cmd_zstd22_with_size = { 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