[mirror_ubuntu-focal-kernel.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

# 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) | $(KGZIP) -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
	$(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,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 -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
b2441318	1	# SPDX-License-Identifier: GPL-2.0
f77bf014 SR	2	# Backward compatibility
	3	asflags-y += $(EXTRA_AFLAGS)
	4	ccflags-y += $(EXTRA_CFLAGS)
	5	cppflags-y += $(EXTRA_CPPFLAGS)
	6	ldflags-y += $(EXTRA_LDFLAGS)
	7
8fdc3fbb	8	# flags that take effect in current and sub directories
4e13d47c MY	9	KBUILD_AFLAGS += $(subdir-asflags-y)
4e13d47c MY	10	KBUILD_CFLAGS += $(subdir-ccflags-y)
720097d8	11
1da177e4 LT	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
1da177e4 LT	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
1da177e4 LT	21	lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
1da177e4 LT	22
8fdc3fbb C	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))
1da177e4 LT	27
	28	# Handle objects in subdirs
	29	# ---------------------------------------------------------------------------
f49821ee	30	# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a
1da177e4	31	# and add the directory to the list of dirs to descend into: $(subdir-y)
38385f8f	32	# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
1da177e4	33	# and add the directory to the list of dirs to descend into: $(subdir-m)
1da177e4 LT	34	__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
	35	subdir-y += $(__subdir-y)
	36	__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
	37	subdir-m += $(__subdir-m)
f49821ee	38	obj-y := $(patsubst %/, %/built-in.a, $(obj-y))
1da177e4 LT	39	obj-m := $(filter-out %/, $(obj-m))
	40
	41	# Subdirectories we need to descend into
1da177e4 LT	42	subdir-ym := $(sort $(subdir-y) $(subdir-m))
1da177e4 LT	43
33e84f2e MY	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))))
1da177e4	47	multi-used := $(multi-used-y) $(multi-used-m)
1da177e4	48
f5fb9765 SR	49	# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
f5fb9765 SR	50	# tell kbuild to descend
f49821ee	51	subdir-obj-y := $(filter %/built-in.a, $(obj-y))
1da177e4	52
f98fe47c MY	53	# Replace multi-part objects by their individual parts,
f98fe47c MY	54	# including built-in.a from subdirectories
33e84f2e MY	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)))
33e84f2e MY	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)))
1da177e4	57
7e7962dd MY	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) += $(dtb-)
	62
4f0e3a57 RH	63	ifneq ($(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
1da177e4 LT	68	# Add subdir path
	69
	70	extra-y := $(addprefix $(obj)/,$(extra-y))
	71	always := $(addprefix $(obj)/,$(always))
	72	targets := $(addprefix $(obj)/,$(targets))
551559e1	73	modorder := $(addprefix $(obj)/,$(modorder))
1da177e4 LT	74	obj-m := $(addprefix $(obj)/,$(obj-m))
	75	lib-y := $(addprefix $(obj)/,$(lib-y))
	76	subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
f5f33681 MY	77	real-obj-y := $(addprefix $(obj)/,$(real-obj-y))
f5f33681 MY	78	real-obj-m := $(addprefix $(obj)/,$(real-obj-m))
1da177e4	79	multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
1da177e4	80	subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
1da177e4	81
c0152e9a MY	82	# Finds the multi-part object the current object will be linked into.
	83	# If the object belongs to two or more multi-part objects, all of them are
	84	# concatenated with a colon separator.
	85	modname-multi = $(subst $(space),:,$(sort $(foreach m,$(multi-used),\
	86	$(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))))
	87
	88	modname = $(if $(modname-multi),$(modname-multi),$(basetarget))
	89
54b8ae66 MY	90	# target with $(obj)/ and its suffix stripped
	91	target-stem = $(basename $(patsubst $(obj)/%,%,$@))
	92
1da177e4	93	# These flags are needed for modversions and compiling, so we define them here
8fdc3fbb	94	# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
1da177e4	95	# end up in (or would, if it gets compiled in)
b42841b7 MM	96	name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
b42841b7 MM	97	basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
aeacb019	98	modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname))
1da177e4	99
4e13d47c	100	orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
54b8ae66 MY	101	$(ccflags-y) $(CFLAGS_$(target-stem).o)
54b8ae66 MY	102	_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags))
4e13d47c	103	orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
54b8ae66 MY	104	$(asflags-y) $(AFLAGS_$(target-stem).o)
	105	_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags))
	106	_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds)
1da177e4	107
2521f2c2 PO	108	#
	109	# Enable gcov profiling flags for a file, directory or for all files depending
	110	# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
	111	# (in this order)
	112	#
	113	ifeq ($(CONFIG_GCOV_KERNEL),y)
	114	_c_flags += $(if $(patsubst n%,, \
	115	$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
	116	$(CFLAGS_GCOV))
	117	endif
	118
0b24becc AR	119	#
	120	# Enable address sanitizer flags for kernel except some files or directories
	121	# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
	122	#
	123	ifeq ($(CONFIG_KASAN),y)
	124	_c_flags += $(if $(patsubst n%,, \
	125	$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
0e410e15	126	$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
0b24becc AR	127	endif
0b24becc AR	128
c6d30853 AR	129	ifeq ($(CONFIG_UBSAN),y)
	130	_c_flags += $(if $(patsubst n%,, \
	131	$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
	132	$(CFLAGS_UBSAN))
	133	endif
	134
5c9a8750 DV	135	ifeq ($(CONFIG_KCOV),y)
5c9a8750 DV	136	_c_flags += $(if $(patsubst n%,, \
a4691dea	137	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
5c9a8750 DV	138	$(CFLAGS_KCOV))
	139	endif
	140
cdd750bf MY	141	# $(srctree)/$(src) for including checkin headers from generated source files
cdd750bf MY	142	# $(objtree)/$(obj) for including generated headers from checkin source files
58156ba4	143	ifeq ($(KBUILD_EXTMOD),)
051f278e	144	ifdef building_out_of_srctree
cdd750bf MY	145	_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
	146	_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
	147	_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj)
1da177e4	148	endif
58156ba4	149	endif
1da177e4	150
eb27ea5c MY	151	part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y)
	152	quiet_modtag = $(if $(part-of-module),[M], )
	153
	154	modkern_cflags = \
	155	$(if $(part-of-module), \
	156	$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
	157	$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
	158
	159	modkern_aflags = $(if $(part-of-module), \
	160	$(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \
	161	$(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL))
	162
d8672b40	163	c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
a95b37e2	164	-include $(srctree)/include/linux/compiler_types.h \
cdd750bf	165	$(_c_flags) $(modkern_cflags) \
b42841b7	166	$(basename_flags) $(modname_flags)
1da177e4	167
d8672b40	168	a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
cdd750bf	169	$(_a_flags) $(modkern_aflags)
1da177e4	170
d8672b40	171	cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
cdd750bf	172	$(_cpp_flags)
1da177e4	173
d503ac53	174	ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F))
1da177e4	175
50f9ddaf MY	176	DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
50f9ddaf MY	177
b0a4d8b3	178	dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
50f9ddaf	179	$(addprefix -I,$(DTC_INCLUDE)) \
e570d7c1 SW	180	-undef -D__DTS__
e570d7c1 SW	181
c8589d1e MY	182	# Useful for describing the dependency of composite objects
	183	# Usage:
	184	# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
	185	define multi_depend
	186	$(foreach m, $(notdir $1), \
	187	$(eval $(obj)/$m: \
	188	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
	189	endef
	190
1da177e4 LT	191	# Shipped files
	192	# ===========================================================================
	193
	194	quiet_cmd_shipped = SHIPPED $@
	195	cmd_shipped = cat $< > $@
	196
991d76c9	197	$(obj)/%: $(src)/%_shipped
1da177e4 LT	198	$(call cmd,shipped)
	199
	200	# Commands useful for building a boot image
	201	# ===========================================================================
38385f8f	202	#
1da177e4 LT	203	# Use as following:
	204	#
	205	# target: source(s) FORCE
	206	# $(if_changed,ld/objcopy/gzip)
	207	#
836caba7	208	# and add target to extra-y so that we know we have to
1da177e4 LT	209	# read in the saved command line
	210
	211	# Linking
	212	# ---------------------------------------------------------------------------
	213
	214	quiet_cmd_ld = LD $@
afa974b7	215	cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@
1da177e4	216
898f5a00 MY	217	# Archive
	218	# ---------------------------------------------------------------------------
	219
	220	quiet_cmd_ar = AR $@
13dc8c02	221	cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs)
898f5a00	222
1da177e4 LT	223	# Objcopy
	224	# ---------------------------------------------------------------------------
	225
	226	quiet_cmd_objcopy = OBJCOPY $@
	227	cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
	228
	229	# Gzip
	230	# ---------------------------------------------------------------------------
	231
	232	quiet_cmd_gzip = GZIP $@
a52f41fc	233	cmd_gzip = cat $(real-prereqs) \| $(KGZIP) -n -f -9 > $@
1da177e4	234
aab94339 DB	235	# DTC
aab94339 DB	236	# ---------------------------------------------------------------------------
6b22b3d1	237	DTC ?= $(objtree)/scripts/dtc/dtc
aab94339	238
bc553986	239	# Disable noisy checks by default
e27128db	240	ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
8654cb8d	241	DTC_FLAGS += -Wno-unit_address_vs_reg \
8654cb8d	242	-Wno-unit_address_format \
4fd98e37 RH	243	-Wno-avoid_unnecessary_addr_size \
4fd98e37 RH	244	-Wno-alias_paths \
74656b68	245	-Wno-graph_child_address \
70523a3c	246	-Wno-simple_bus_reg \
74656b68	247	-Wno-unique_unit_address \
8654cb8d	248	-Wno-pci_device_reg
bc553986 RH	249	endif
bc553986 RH	250
e27128db	251	ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),)
8654cb8d RH	252	DTC_FLAGS += -Wnode_name_chars_strict \
8654cb8d RH	253	-Wproperty_name_chars_strict
bc553986 RH	254	endif
bc553986 RH	255
331f7416 FR	256	DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
331f7416 FR	257
aab94339	258	# Generate an assembly file to wrap the output of the device tree compiler
1c00a47e	259	quiet_cmd_dt_S_dtb= DTB $@
aab94339	260	cmd_dt_S_dtb= \
b79c6aa6	261	{ \
aab94339 DB	262	echo '\#include <asm-generic/vmlinux.lds.h>'; \
	263	echo '.section .dtb.init.rodata,"a"'; \
	264	echo '.balign STRUCT_ALIGNMENT'; \
55fe6da9 JH	265	echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
55fe6da9 JH	266	echo '__dtb_$(subst -,_,$(*F))_begin:'; \
aab94339	267	echo '.incbin "$<" '; \
55fe6da9 JH	268	echo '__dtb_$(subst -,_,$(*F))_end:'; \
55fe6da9 JH	269	echo '.global __dtb_$(subst -,_,$(*F))_end'; \
aab94339	270	echo '.balign STRUCT_ALIGNMENT'; \
b79c6aa6	271	} > $@
aab94339	272
a7f92419 MY	273	$(obj)/%.dtb.S: $(obj)/%.dtb FORCE
a7f92419 MY	274	$(call if_changed,dt_S_dtb)
aab94339 DB	275
aab94339 DB	276	quiet_cmd_dtc = DTC $@
77479b38	277	cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
37c8a5fa	278	$(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
4f0e3a57	279	$(DTC) -O $(2) -o $@ -b 0 \
50f9ddaf	280	$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
b0a4d8b3 IC	281	-d $(depfile).dtc.tmp $(dtc-tmp) ; \
b0a4d8b3 IC	282	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
1da177e4	283
b8fc5b21	284	$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE
4f0e3a57 RH	285	$(call if_changed_dep,dtc,dtb)
	286
	287	DT_CHECKER ?= dt-validate
	288	DT_BINDING_DIR := Documentation/devicetree/bindings
	289	DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml
	290
	291	quiet_cmd_dtb_check = CHECK $@
05aeca7c	292	cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ;
4f0e3a57	293
08051364	294	define rule_dtc
f5688663 MY	295	$(call cmd_and_fixdep,dtc,yaml)
f5688663 MY	296	$(call cmd,dtb_check)
4f0e3a57 RH	297	endef
	298
	299	$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE
73af9e12	300	$(call if_changed_rule,dtc,yaml)
90b335fb	301
b0a4d8b3	302	dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
22435f38	303
bc22c17e AK	304	# Bzip2
	305	# ---------------------------------------------------------------------------
	306
d3dd3b5a PA	307	# Bzip2 and LZMA do not include size in file... so we have to fake that;
d3dd3b5a PA	308	# append the size as a 32-bit littleendian number as gzip does.
4a2ff67c	309	size_append = printf $(shell \
d3dd3b5a	310	dec_size=0; \
afa974b7	311	for F in $(real-prereqs); do \
a670b0b4	312	fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
d3dd3b5a PA	313	dec_size=$$(expr $$dec_size + $$fsize); \
d3dd3b5a PA	314	done; \
1373411a JN	315	printf "%08x\n" $$dec_size \| \
	316	sed 's/\(..\)/\1 /g' \| { \
	317	read ch0 ch1 ch2 ch3; \
	318	for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
	319	printf '%s%03o' '\\' $$((0x$$ch)); \
	320	done; \
	321	} \
d3dd3b5a PA	322	)
	323
	324	quiet_cmd_bzip2 = BZIP2 $@
a52f41fc	325	cmd_bzip2 = { cat $(real-prereqs) \| $(KBZIP2) -9; $(size_append); } > $@
bc22c17e AK	326
	327	# Lzma
	328	# ---------------------------------------------------------------------------
	329
	330	quiet_cmd_lzma = LZMA $@
2f528d84	331	cmd_lzma = { cat $(real-prereqs) \| $(LZMA) -9; $(size_append); } > $@
7dd65feb	332
2d74b2c6	333	quiet_cmd_lzo = LZO $@
a52f41fc	334	cmd_lzo = { cat $(real-prereqs) \| $(KLZOP) -9; $(size_append); } > $@
d61931d8	335
e76e1fdf	336	quiet_cmd_lz4 = LZ4 $@
2f528d84	337	cmd_lz4 = { cat $(real-prereqs) \| $(LZ4) -l -c1 stdin stdout; \
b79c6aa6	338	$(size_append); } > $@
e76e1fdf	339
e3393645 SW	340	# U-Boot mkimage
	341	# ---------------------------------------------------------------------------
	342
	343	MKIMAGE := $(srctree)/scripts/mkuboot.sh
	344
	345	# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
	346	# the number of overrides in arch makefiles
	347	UIMAGE_ARCH ?= $(SRCARCH)
	348	UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
	349	UIMAGE_OPTS-y ?=
	350	UIMAGE_TYPE ?= kernel
	351	UIMAGE_LOADADDR ?= arch_must_set_this
	352	UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
	353	UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
e3393645	354
786ac51a	355	quiet_cmd_uimage = UIMAGE $@
858805b3	356	cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
e3393645 SW	357	-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
	358	-T $(UIMAGE_TYPE) \
	359	-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
786ac51a	360	-n $(UIMAGE_NAME) -d $< $@
e3393645	361
24fa0402 LC	362	# XZ
	363	# ---------------------------------------------------------------------------
	364	# Use xzkern to compress the kernel image and xzmisc to compress other things.
	365	#
	366	# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
	367	# of the kernel decompressor. A BCJ filter is used if it is available for
	368	# the target architecture. xzkern also appends uncompressed size of the data
	369	# using size_append. The .xz format has the size information available at
	370	# the end of the file too, but it's in more complex format and it's good to
	371	# avoid changing the part of the boot code that reads the uncompressed size.
	372	# Note that the bytes added by size_append will make the xz tool think that
	373	# the file is corrupt. This is expected.
	374	#
	375	# xzmisc doesn't use size_append, so it can be used to create normal .xz
	376	# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
	377	# big dictionary would increase the memory usage too much in the multi-call
	378	# decompression mode. A BCJ filter isn't used either.
	379	quiet_cmd_xzkern = XZKERN $@
b956c7a6	380	cmd_xzkern = { cat $(real-prereqs) \| sh $(srctree)/scripts/xz_wrap.sh; \
b79c6aa6	381	$(size_append); } > $@
24fa0402 LC	382
24fa0402 LC	383	quiet_cmd_xzmisc = XZMISC $@
2f528d84	384	cmd_xzmisc = cat $(real-prereqs) \| $(XZ) --check=crc32 --lzma2=dict=1MiB > $@
ebf003f0 MK	385
	386	# ASM offsets
	387	# ---------------------------------------------------------------------------
	388
	389	# Default sed regexp - multiline due to syntax constraints
cf0c3e68 JH	390	#
	391	# Use [:space:] because LLVM's integrated assembler inserts <tab> around
	392	# the .ascii directive whereas GCC keeps the <space> as-is.
ebf003f0	393	define sed-offsets
cf0c3e68 JH	394	's:^[[:space:]]\.ascii[[:space:]]"\(.\)".:\1:; \
cf0c3e68 JH	395	/^->/{s:->#\(.\):/ \1 */:; \
ebf003f0	396	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
cf0c3e68	397	s:->::; p;}'
ebf003f0 MK	398	endef
	399
	400	# Use filechk to avoid rebuilds when a header changes, but the resulting file
	401	# does not
	402	define filechk_offsets
ebf003f0 MK	403	echo "#ifndef $2"; \
	404	echo "#define $2"; \
	405	echo "/*"; \
	406	echo " * DO NOT MODIFY."; \
	407	echo " *"; \
	408	echo " * This file was generated by Kbuild"; \
	409	echo " */"; \
	410	echo ""; \
43fee2b2	411	sed -ne $(sed-offsets) < $<; \
ebf003f0	412	echo ""; \
ad774086	413	echo "#endif"
ebf003f0	414	endef