[linux-2.6-block.git] / scripts / Makefile.lib

# 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), $(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

# Test self-contained headers

# Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
# Stale generated headers are often left over, so pattern matching should
# be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
# to the same location for in-tree building. So, header-test-pattern-y should
# be used with care.
header-test-y	+= $(filter-out $(header-test-), \
		$(patsubst $(srctree)/$(src)/%, %, \
		$(wildcard $(addprefix $(srctree)/$(src)/, \
		$(header-test-pattern-y)))))

extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))

# 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, 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))

# 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 = $(squote)$(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) $(CFLAGS_$(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))

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
Commit	Line	Data
	1	# SPDX-License-Identifier: GPL-2.0
	2	# Backward compatibility
	3	asflags-y += $(EXTRA_AFLAGS)
	4	ccflags-y += $(EXTRA_CFLAGS)
	5	cppflags-y += $(EXTRA_CPPFLAGS)
	6	ldflags-y += $(EXTRA_LDFLAGS)
	7
	8	# flags that take effect in current and sub directories
	9	KBUILD_AFLAGS += $(subdir-asflags-y)
	10	KBUILD_CFLAGS += $(subdir-ccflags-y)
	11
	12	# Figure out what we need to build from the various variables
	13	# ===========================================================================
	14
	15	# When an object is listed to be built compiled-in and modular,
	16	# only build the compiled-in version
	17	obj-m := $(filter-out $(obj-y),$(obj-m))
	18
	19	# Libraries are always collected in one lib file.
	20	# Filter out objects already built-in
	21	lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
	22
	23	# Determine modorder.
	24	# Unfortunately, we don't have information about ordering between -y
	25	# and -m subdirs. Just put -y's first.
	26	modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
	27
	28	# Handle objects in subdirs
	29	# ---------------------------------------------------------------------------
	30	# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
	31	# and add the directory to the list of dirs to descend into: $(subdir-y)
	32	# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
	33	# and add the directory to the list of dirs to descend into: $(subdir-m)
	34	__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
	35	subdir-y += $(__subdir-y)
	36	__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
	37	subdir-m += $(__subdir-m)
	38	obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
	39	obj-m := $(filter-out %/, $(obj-m))
	40
	41	# Subdirectories we need to descend into
	42	subdir-ym := $(sort $(subdir-y) $(subdir-m))
	43
	44	# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object
	45	multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m))))
	46	multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m))))
	47	multi-used := $(multi-used-y) $(multi-used-m)
	48
	49	# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
	50	# tell kbuild to descend
	51	subdir-obj-y := $(filter %/built-in.a, $(obj-y))
	52
	53	# Replace multi-part objects by their individual parts,
	54	# including built-in.a from subdirectories
	55	real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
	56	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)))
	57
	58	# DTB
	59	# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
	60	extra-y += $(dtb-y)
	61	extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
	62
	63	ifneq ($(CHECK_DTBS),)
	64	extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y))
	65	extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-))
	66	endif
	67
	68	# Test self-contained headers
	69
	70	# Wildcard searches in $(srctree)/$(src)/, but not in $(objtree)/$(obj)/.
	71	# Stale generated headers are often left over, so pattern matching should
	72	# be avoided. Please notice $(srctree)/$(src)/ and $(objtree)/$(obj) point
	73	# to the same location for in-tree building. So, header-test-pattern-y should
	74	# be used with care.
	75	header-test-y += $(filter-out $(header-test-), \
	76	$(patsubst $(srctree)/$(src)/%, %, \
	77	$(wildcard $(addprefix $(srctree)/$(src)/, \
	78	$(header-test-pattern-y)))))
	79
	80	extra-$(CONFIG_HEADER_TEST) += $(addsuffix .s, $(header-test-y) $(header-test-m))
	81
	82	# Add subdir path
	83
	84	extra-y := $(addprefix $(obj)/,$(extra-y))
	85	always := $(addprefix $(obj)/,$(always))
	86	targets := $(addprefix $(obj)/,$(targets))
	87	modorder := $(addprefix $(obj)/,$(modorder))
	88	obj-m := $(addprefix $(obj)/,$(obj-m))
	89	lib-y := $(addprefix $(obj)/,$(lib-y))
	90	subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
	91	real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
	92	real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
	93	multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
	94	subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
	95
	96	# Finds the multi-part object the current object will be linked into.
	97	# If the object belongs to two or more multi-part objects, all of them are
	98	# concatenated with a colon separator.
	99	modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
	100	$(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
	101
	102	modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
	103
	104	# target with $(obj)/ and its suffix stripped
	105	target-stem = $(basename $(patsubst $(obj)/%,%,$@))
	106
	107	# These flags are needed for modversions and compiling, so we define them here
	108	# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
	109	# end up in (or would, if it gets compiled in)
	110	name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
	111	basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
	112	modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
	113
	114	orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
	115	$(ccflags-y) $(CFLAGS_$(target-stem).o)
	116	_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
	117	orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
	118	$(asflags-y) $(AFLAGS_$(target-stem).o)
	119	_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
	120	_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
	121
	122	#
	123	# Enable gcov profiling flags for a file, directory or for all files depending
	124	# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
	125	# (in this order)
	126	#
	127	ifeq ($(CONFIG_GCOV_KERNEL),y)
	128	_c_flags += $(if $(patsubst n%,, \
	129	$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
	130	$(CFLAGS_GCOV))
	131	endif
	132
	133	#
	134	# Enable address sanitizer flags for kernel except some files or directories
	135	# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
	136	#
	137	ifeq ($(CONFIG_KASAN),y)
	138	_c_flags += $(if $(patsubst n%,, \
	139	$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
	140	$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
	141	endif
	142
	143	ifeq ($(CONFIG_UBSAN),y)
	144	_c_flags += $(if $(patsubst n%,, \
	145	$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
	146	$(CFLAGS_UBSAN))
	147	endif
	148
	149	ifeq ($(CONFIG_KCOV),y)
	150	_c_flags += $(if $(patsubst n%,, \
	151	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
	152	$(CFLAGS_KCOV))
	153	endif
	154
	155	# $(srctree)/$(src) for including checkin headers from generated source files
	156	# $(objtree)/$(obj) for including generated headers from checkin source files
	157	ifeq ($(KBUILD_EXTMOD),)
	158	ifdef building_out_of_srctree
	159	_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
	160	_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
	161	_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
	162	endif
	163	endif
	164
	165	part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
	166	quiet_modtag = $(if $(part-of-module),[M], )
	167
	168	modkern_cflags = \
	169	$(if $(part-of-module), \
	170	$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
	171	$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
	172
	173	modkern_aflags = $(if $(part-of-module), \
	174	$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
	175	$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
	176
	177	c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
	178	-include $(srctree)/include/linux/compiler_types.h \
	179	$(_c_flags) $(modkern_cflags) \
	180	$(basename_flags) $(modname_flags)
	181
	182	a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
	183	$(_a_flags) $(modkern_aflags)
	184
	185	cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
	186	$(_cpp_flags)
	187
	188	ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
	189
	190	DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
	191
	192	dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
	193	$(addprefix -I,$(DTC_INCLUDE)) \
	194	-undef -D__DTS__
	195
	196	# Useful for describing the dependency of composite objects
	197	# Usage:
	198	# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
	199	define multi_depend
	200	$(foreach m, $(notdir $1), \
	201	$(eval $(obj)/$m: \
	202	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
	203	endef
	204
	205	# Shipped files
	206	# ===========================================================================
	207
	208	quiet_cmd_shipped = SHIPPED $@
	209	cmd_shipped = cat $< > $@
	210
	211	$(obj)/%: $(src)/%_shipped
	212	$(call cmd,shipped)
	213
	214	# Commands useful for building a boot image
	215	# ===========================================================================
	216	#
	217	# Use as following:
	218	#
	219	# target: source(s) FORCE
	220	# $(if_changed,ld/objcopy/gzip)
	221	#
	222	# and add target to extra-y so that we know we have to
	223	# read in the saved command line
	224
	225	# Linking
	226	# ---------------------------------------------------------------------------
	227
	228	quiet_cmd_ld = LD $@
	229	cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
	230
	231	# Archive
	232	# ---------------------------------------------------------------------------
	233
	234	quiet_cmd_ar = AR $@
	235	cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
	236
	237	# Objcopy
	238	# ---------------------------------------------------------------------------
	239
	240	quiet_cmd_objcopy = OBJCOPY $@
	241	cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
	242
	243	# Gzip
	244	# ---------------------------------------------------------------------------
	245
	246	quiet_cmd_gzip = GZIP $@
	247	cmd_gzip = cat $(real-prereqs) \| gzip -n -f -9 > $@
	248
	249	# DTC
	250	# ---------------------------------------------------------------------------
	251	DTC ?= $(objtree)/scripts/dtc/dtc
	252
	253	# Disable noisy checks by default
	254	ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
	255	DTC_FLAGS += -Wno-unit_address_vs_reg \
	256	-Wno-unit_address_format \
	257	-Wno-avoid_unnecessary_addr_size \
	258	-Wno-alias_paths \
	259	-Wno-graph_child_address \
	260	-Wno-simple_bus_reg \
	261	-Wno-unique_unit_address \
	262	-Wno-pci_device_reg
	263	endif
	264
	265	ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
	266	DTC_FLAGS += -Wnode_name_chars_strict \
	267	-Wproperty_name_chars_strict
	268	endif
	269
	270	DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
	271
	272	# Generate an assembly file to wrap the output of the device tree compiler
	273	quiet_cmd_dt_S_dtb= DTB $@
	274	cmd_dt_S_dtb= \
	275	{ \
	276	echo '\#include <asm-generic/vmlinux.lds.h>'; \
	277	echo '.section .dtb.init.rodata,"a"'; \
	278	echo '.balign STRUCT_ALIGNMENT'; \
	279	echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
	280	echo '__dtb_$(subst -,_,$(*F))_begin:'; \
	281	echo '.incbin "$<" '; \
	282	echo '__dtb_$(subst -,_,$(*F))_end:'; \
	283	echo '.global __dtb_$(subst -,_,$(*F))_end'; \
	284	echo '.balign STRUCT_ALIGNMENT'; \
	285	} > $@
	286
	287	$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
	288	$(call if_changed,dt_S_dtb)
	289
	290	quiet_cmd_dtc = DTC $@
	291	cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
	292	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
	293	$(DTC) -O $(2) -o $@ -b 0 \
	294	$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
	295	-d $(depfile).dtc.tmp $(dtc-tmp) ; \
	296	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
	297
	298	$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
	299	$(call if_changed_dep,dtc,dtb)
	300
	301	DT_CHECKER ?= dt-validate
	302	DT_BINDING_DIR := Documentation/devicetree/bindings
	303	DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
	304
	305	quiet_cmd_dtb_check = CHECK $@
	306	cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ;
	307
	308	define rule_dtc_dt_yaml
	309	$(call cmd_and_fixdep,dtc,yaml)
	310	$(call cmd,dtb_check)
	311	endef
	312
	313	$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
	314	$(call if_changed_rule,dtc_dt_yaml)
	315
	316	dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
	317
	318	# Bzip2
	319	# ---------------------------------------------------------------------------
	320
	321	# Bzip2 and LZMA do not include size in file... so we have to fake that;
	322	# append the size as a 32-bit littleendian number as gzip does.
	323	size_append = printf $(shell \
	324	dec_size=0; \
	325	for F in $(real-prereqs); do \
	326	fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
	327	dec_size=$$(expr $$dec_size + $$fsize); \
	328	done; \
	329	printf "%08x\n" $$dec_size \| \
	330	sed 's/\(..\)/\1 /g' \| { \
	331	read ch0 ch1 ch2 ch3; \
	332	for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
	333	printf '%s%03o' '\\' $$((0x$$ch)); \
	334	done; \
	335	} \
	336	)
	337
	338	quiet_cmd_bzip2 = BZIP2 $@
	339	cmd_bzip2 = { cat $(real-prereqs) \| bzip2 -9; $(size_append); } > $@
	340
	341	# Lzma
	342	# ---------------------------------------------------------------------------
	343
	344	quiet_cmd_lzma = LZMA $@
	345	cmd_lzma = { cat $(real-prereqs) \| lzma -9; $(size_append); } > $@
	346
	347	quiet_cmd_lzo = LZO $@
	348	cmd_lzo = { cat $(real-prereqs) \| lzop -9; $(size_append); } > $@
	349
	350	quiet_cmd_lz4 = LZ4 $@
	351	cmd_lz4 = { cat $(real-prereqs) \| lz4c -l -c1 stdin stdout; \
	352	$(size_append); } > $@
	353
	354	# U-Boot mkimage
	355	# ---------------------------------------------------------------------------
	356
	357	MKIMAGE := $(srctree)/scripts/mkuboot.sh
	358
	359	# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
	360	# the number of overrides in arch makefiles
	361	UIMAGE_ARCH ?= $(SRCARCH)
	362	UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
	363	UIMAGE_OPTS-y ?=
	364	UIMAGE_TYPE ?= kernel
	365	UIMAGE_LOADADDR ?= arch_must_set_this
	366	UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
	367	UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
	368
	369	quiet_cmd_uimage = UIMAGE $@
	370	cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
	371	-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
	372	-T $(UIMAGE_TYPE) \
	373	-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
	374	-n $(UIMAGE_NAME) -d $< $@
	375
	376	# XZ
	377	# ---------------------------------------------------------------------------
	378	# Use xzkern to compress the kernel image and xzmisc to compress other things.
	379	#
	380	# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
	381	# of the kernel decompressor. A BCJ filter is used if it is available for
	382	# the target architecture. xzkern also appends uncompressed size of the data
	383	# using size_append. The .xz format has the size information available at
	384	# the end of the file too, but it's in more complex format and it's good to
	385	# avoid changing the part of the boot code that reads the uncompressed size.
	386	# Note that the bytes added by size_append will make the xz tool think that
	387	# the file is corrupt. This is expected.
	388	#
	389	# xzmisc doesn't use size_append, so it can be used to create normal .xz
	390	# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
	391	# big dictionary would increase the memory usage too much in the multi-call
	392	# decompression mode. A BCJ filter isn't used either.
	393	quiet_cmd_xzkern = XZKERN $@
	394	cmd_xzkern = { cat $(real-prereqs) \| sh $(srctree)/scripts/xz_wrap.sh; \
	395	$(size_append); } > $@
	396
	397	quiet_cmd_xzmisc = XZMISC $@
	398	cmd_xzmisc = cat $(real-prereqs) \| xz --check=crc32 --lzma2=dict=1MiB > $@
	399
	400	# ASM offsets
	401	# ---------------------------------------------------------------------------
	402
	403	# Default sed regexp - multiline due to syntax constraints
	404	#
	405	# Use [:space:] because LLVM's integrated assembler inserts <tab> around
	406	# the .ascii directive whereas GCC keeps the <space> as-is.
	407	define sed-offsets
	408	's:^[[:space:]]\.ascii[[:space:]]"\(.\)".:\1:; \
	409	/^->/{s:->#\(.\):/ \1 */:; \
	410	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
	411	s:->::; p;}'
	412	endef
	413
	414	# Use filechk to avoid rebuilds when a header changes, but the resulting file
	415	# does not
	416	define filechk_offsets
	417	echo "#ifndef $2"; \
	418	echo "#define $2"; \
	419	echo "/*"; \
	420	echo " * DO NOT MODIFY."; \
	421	echo " *"; \
	422	echo " * This file was generated by Kbuild"; \
	423	echo " */"; \
	424	echo ""; \
	425	sed -ne $(sed-offsets) < $<; \
	426	echo ""; \
	427	echo "#endif"
	428	endef