[mirror_ubuntu-bionic-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.o
#   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.o, $(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)))

# Build list of the parts of our composite objects, our composite
# objects depend on those (obviously)
multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))

# $(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.o, $(obj-y))

# Replace multi-part objects by their individual parts, look at local dir only
real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
real-objs-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-)

# Add subdir path

extra-y		:= $(addprefix $(obj)/,$(extra-y))
always		:= $(addprefix $(obj)/,$(always))
targets		:= $(addprefix $(obj)/,$(targets))
modorder	:= $(addprefix $(obj)/,$(modorder))
obj-y		:= $(addprefix $(obj)/,$(obj-y))
obj-m		:= $(addprefix $(obj)/,$(obj-m))
lib-y		:= $(addprefix $(obj)/,$(lib-y))
subdir-obj-y	:= $(addprefix $(obj)/,$(subdir-obj-y))
real-objs-y	:= $(addprefix $(obj)/,$(real-objs-y))
real-objs-m	:= $(addprefix $(obj)/,$(real-objs-m))
single-used-m	:= $(addprefix $(obj)/,$(single-used-m))
multi-used-y	:= $(addprefix $(obj)/,$(multi-used-y))
multi-used-m	:= $(addprefix $(obj)/,$(multi-used-m))
multi-objs-y	:= $(addprefix $(obj)/,$(multi-objs-y))
multi-objs-m	:= $(addprefix $(obj)/,$(multi-objs-m))
subdir-ym	:= $(addprefix $(obj)/,$(subdir-ym))

# 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)
# Note: Files that end up in two or more modules are compiled without the
#       KBUILD_MODNAME definition. The reason is that any made-up name would
#       differ in different configs.
name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
modname_flags  = $(if $(filter 1,$(words $(modname))),\
                 -DKBUILD_MODNAME=$(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

# If building the kernel in a separate objtree expand all occurrences
# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').

ifeq ($(KBUILD_SRC),)
__c_flags	= $(_c_flags)
__a_flags	= $(_a_flags)
__cpp_flags     = $(_cpp_flags)
else

# -I$(obj) locates generated .h files
# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
#   and locates generated .h files
# FIXME: Replace both with specific CFLAGS* statements in the makefiles
__c_flags	= $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
		  $(call flags,_c_flags)
__a_flags	= $(call flags,_a_flags)
__cpp_flags     = $(call flags,_cpp_flags)
endif

c_flags        = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE)     \
		 $(__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       = $(LDFLAGS) $(ldflags-y)

DTC_INCLUDE    := $(srctree)/scripts/dtc/include-prefixes

dtc_cpp_flags  = -Wp,-MD,$(depfile).pre.tmp -nostdinc                    \
		 $(addprefix -I,$(DTC_INCLUDE))                          \
		 -undef -D__DTS__

# Finds the multi-part object the current object will be linked into
modname-multi = $(sort $(foreach m,$(multi-used),\
		$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))

# 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

ifdef REGENERATE_PARSERS

# LEX
# ---------------------------------------------------------------------------
LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)

quiet_cmd_flex = LEX     $@
      cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<

.PRECIOUS: $(src)/%.lex.c_shipped
$(src)/%.lex.c_shipped: $(src)/%.l
	$(call cmd,flex)

# YACC
# ---------------------------------------------------------------------------
YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)

quiet_cmd_bison = YACC    $@
      cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<

.PRECIOUS: $(src)/%.tab.c_shipped
$(src)/%.tab.c_shipped: $(src)/%.y
	$(call cmd,bison)

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

.PRECIOUS: $(src)/%.tab.h_shipped
$(src)/%.tab.h_shipped: $(src)/%.y
	$(call cmd,bison_h)

endif

# 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) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
	       $(filter-out FORCE,$^) -o $@

# Objcopy
# ---------------------------------------------------------------------------

quiet_cmd_objcopy = OBJCOPY $@
cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

# Gzip
# ---------------------------------------------------------------------------

quiet_cmd_gzip = GZIP    $@
cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \
	(rm -f $@ ; false)

# DTC
# ---------------------------------------------------------------------------
DTC ?= $(objtree)/scripts/dtc/dtc

# Disable noisy checks by default
ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
DTC_FLAGS += -Wno-unit_address_vs_reg \
	-Wno-simple_bus_reg \
	-Wno-unit_address_format \
	-Wno-pci_bridge \
	-Wno-pci_device_bus_num \
	-Wno-pci_device_reg
endif

ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
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
	$(call cmd,dt_S_dtb)

quiet_cmd_dtc = DTC     $@
cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
	$(DTC) -O dtb -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 FORCE
	$(call if_changed_dep,dtc)

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 $1; do								\
	fsize=$$(stat -c "%s" $$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 $(filter-out FORCE,$^) | \
	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

# Lzma
# ---------------------------------------------------------------------------

quiet_cmd_lzma = LZMA    $@
cmd_lzma = (cat $(filter-out FORCE,$^) | \
	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

quiet_cmd_lzo = LZO     $@
cmd_lzo = (cat $(filter-out FORCE,$^) | \
	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

quiet_cmd_lz4 = LZ4     $@
cmd_lz4 = (cat $(filter-out FORCE,$^) | \
	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

# 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)'
UIMAGE_IN ?= $<
UIMAGE_OUT ?= $@

quiet_cmd_uimage = UIMAGE  $(UIMAGE_OUT)
      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 $(UIMAGE_IN) $(UIMAGE_OUT)

# 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 $(filter-out FORCE,$^) | \
	sh $(srctree)/scripts/xz_wrap.sh && \
	$(call size_append, $(filter-out FORCE,$^))) > $@ || \
	(rm -f $@ ; false)

quiet_cmd_xzmisc = XZMISC  $@
cmd_xzmisc = (cat $(filter-out FORCE,$^) | \
	xz --check=crc32 --lzma2=dict=1MiB) > $@ || \
	(rm -f $@ ; false)

# 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
	(set -e; \
	 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	# ---------------------------------------------------------------------------
	30	# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
	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)
	38	obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
	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
8fdc3fbb	44	# if $(foo-objs), $(foo-y), or $(foo-m) exists, foo.o is a composite object
1da177e4	45	multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
cf4f2193	46	multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
1da177e4 LT	47	multi-used := $(multi-used-y) $(multi-used-m)
	48	single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
	49
	50	# Build list of the parts of our composite objects, our composite
	51	# objects depend on those (obviously)
	52	multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
	53	multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
1da177e4	54
f5fb9765 SR	55	# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
	56	# tell kbuild to descend
	57	subdir-obj-y := $(filter %/built-in.o, $(obj-y))
1da177e4	58
1da177e4	59	# Replace multi-part objects by their individual parts, look at local dir only
10aaa3b7	60	real-objs-y := $(foreach m, $(filter-out $(subdir-obj-y), $(obj-y)), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m)))
cf4f2193	61	real-objs-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)))
1da177e4	62
7e7962dd MY	63	# DTB
	64	# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
	65	extra-y += $(dtb-y)
	66	extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
	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-y := $(addprefix $(obj)/,$(obj-y))
	75	obj-m := $(addprefix $(obj)/,$(obj-m))
	76	lib-y := $(addprefix $(obj)/,$(lib-y))
	77	subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
	78	real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
	79	real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
	80	single-used-m := $(addprefix $(obj)/,$(single-used-m))
	81	multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
	82	multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
	83	multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
	84	multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
	85	subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
1da177e4	86
1da177e4	87	# These flags are needed for modversions and compiling, so we define them here
8fdc3fbb	88	# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will
1da177e4	89	# end up in (or would, if it gets compiled in)
5bb0571b MM	90	# Note: Files that end up in two or more modules are compiled without the
	91	# KBUILD_MODNAME definition. The reason is that any made-up name would
	92	# differ in different configs.
b42841b7 MM	93	name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
b42841b7 MM	94	basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
f83b5e32	95	modname_flags = $(if $(filter 1,$(words $(modname))),\
b42841b7	96	-DKBUILD_MODNAME=$(call name-fix,$(modname)))
1da177e4	97
4e13d47c	98	orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \
d8672b40	99	$(ccflags-y) $(CFLAGS_$(basetarget).o)
656ee82c	100	_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
4e13d47c	101	orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \
d8672b40	102	$(asflags-y) $(AFLAGS_$(basetarget).o)
a7e137eb	103	_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
f77bf014	104	_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
1da177e4	105
2521f2c2 PO	106	#
	107	# Enable gcov profiling flags for a file, directory or for all files depending
	108	# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
	109	# (in this order)
	110	#
	111	ifeq ($(CONFIG_GCOV_KERNEL),y)
	112	_c_flags += $(if $(patsubst n%,, \
	113	$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
	114	$(CFLAGS_GCOV))
	115	endif
	116
0b24becc AR	117	#
	118	# Enable address sanitizer flags for kernel except some files or directories
	119	# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
	120	#
	121	ifeq ($(CONFIG_KASAN),y)
	122	_c_flags += $(if $(patsubst n%,, \
	123	$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
691cb3fd	124	$(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE))
0b24becc AR	125	endif
0b24becc AR	126
c6d30853 AR	127	ifeq ($(CONFIG_UBSAN),y)
	128	_c_flags += $(if $(patsubst n%,, \
	129	$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
	130	$(CFLAGS_UBSAN))
	131	endif
	132
5c9a8750 DV	133	ifeq ($(CONFIG_KCOV),y)
5c9a8750 DV	134	_c_flags += $(if $(patsubst n%,, \
a4691dea	135	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
5c9a8750 DV	136	$(CFLAGS_KCOV))
	137	endif
	138
1da177e4 LT	139	# If building the kernel in a separate objtree expand all occurrences
	140	# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
	141
	142	ifeq ($(KBUILD_SRC),)
	143	__c_flags = $(_c_flags)
	144	__a_flags = $(_a_flags)
	145	__cpp_flags = $(_cpp_flags)
	146	else
	147
1da177e4 LT	148	# -I$(obj) locates generated .h files
	149	# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
	150	# and locates generated .h files
	151	# FIXME: Replace both with specific CFLAGS* statements in the makefiles
4607ebf0	152	__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
db547ef1 AB	153	$(call flags,_c_flags)
	154	__a_flags = $(call flags,_a_flags)
	155	__cpp_flags = $(call flags,_cpp_flags)
1da177e4 LT	156	endif
1da177e4 LT	157
d8672b40 SR	158	c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
d8672b40 SR	159	$(__c_flags) $(modkern_cflags) \
b42841b7	160	$(basename_flags) $(modname_flags)
1da177e4	161
d8672b40	162	a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
1da177e4 LT	163	$(__a_flags) $(modkern_aflags)
1da177e4 LT	164
d8672b40 SR	165	cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
d8672b40 SR	166	$(__cpp_flags)
1da177e4	167
f77bf014	168	ld_flags = $(LDFLAGS) $(ldflags-y)
1da177e4	169
50f9ddaf MY	170	DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
50f9ddaf MY	171
b0a4d8b3	172	dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
50f9ddaf	173	$(addprefix -I,$(DTC_INCLUDE)) \
e570d7c1 SW	174	-undef -D__DTS__
e570d7c1 SW	175
1da177e4 LT	176	# Finds the multi-part object the current object will be linked into
	177	modname-multi = $(sort $(foreach m,$(multi-used),\
	178	$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
	179
c8589d1e MY	180	# Useful for describing the dependency of composite objects
	181	# Usage:
	182	# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
	183	define multi_depend
	184	$(foreach m, $(notdir $1), \
	185	$(eval $(obj)/$m: \
	186	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
	187	endef
	188
7373f4f8 AL	189	ifdef REGENERATE_PARSERS
7373f4f8 AL	190
7373f4f8 AL	191	# LEX
	192	# ---------------------------------------------------------------------------
	193	LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
	194
	195	quiet_cmd_flex = LEX $@
	196	cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
	197
58238c81	198	.PRECIOUS: $(src)/%.lex.c_shipped
7373f4f8 AL	199	$(src)/%.lex.c_shipped: $(src)/%.l
	200	$(call cmd,flex)
	201
	202	# YACC
	203	# ---------------------------------------------------------------------------
	204	YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
	205
	206	quiet_cmd_bison = YACC $@
	207	cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
	208
58238c81	209	.PRECIOUS: $(src)/%.tab.c_shipped
7373f4f8 AL	210	$(src)/%.tab.c_shipped: $(src)/%.y
	211	$(call cmd,bison)
	212
	213	quiet_cmd_bison_h = YACC $@
	214	cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
	215
58238c81	216	.PRECIOUS: $(src)/%.tab.h_shipped
7373f4f8 AL	217	$(src)/%.tab.h_shipped: $(src)/%.y
	218	$(call cmd,bison_h)
	219
	220	endif
	221
1da177e4 LT	222	# Shipped files
	223	# ===========================================================================
	224
	225	quiet_cmd_shipped = SHIPPED $@
	226	cmd_shipped = cat $< > $@
	227
991d76c9	228	$(obj)/%: $(src)/%_shipped
1da177e4 LT	229	$(call cmd,shipped)
	230
	231	# Commands useful for building a boot image
	232	# ===========================================================================
38385f8f	233	#
1da177e4 LT	234	# Use as following:
	235	#
	236	# target: source(s) FORCE
	237	# $(if_changed,ld/objcopy/gzip)
	238	#
836caba7	239	# and add target to extra-y so that we know we have to
1da177e4 LT	240	# read in the saved command line
	241
	242	# Linking
	243	# ---------------------------------------------------------------------------
	244
	245	quiet_cmd_ld = LD $@
f77bf014	246	cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
38385f8f	247	$(filter-out FORCE,$^) -o $@
1da177e4 LT	248
	249	# Objcopy
	250	# ---------------------------------------------------------------------------
	251
	252	quiet_cmd_objcopy = OBJCOPY $@
	253	cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
	254
	255	# Gzip
	256	# ---------------------------------------------------------------------------
	257
	258	quiet_cmd_gzip = GZIP $@
6ae9ecb8	259	cmd_gzip = (cat $(filter-out FORCE,$^) \| gzip -n -f -9 > $@) \|\| \
d3dd3b5a	260	(rm -f $@ ; false)
1da177e4	261
aab94339 DB	262	# DTC
aab94339 DB	263	# ---------------------------------------------------------------------------
6b22b3d1	264	DTC ?= $(objtree)/scripts/dtc/dtc
aab94339	265
bc553986 RH	266	# Disable noisy checks by default
bc553986 RH	267	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
8654cb8d RH	268	DTC_FLAGS += -Wno-unit_address_vs_reg \
	269	-Wno-simple_bus_reg \
	270	-Wno-unit_address_format \
	271	-Wno-pci_bridge \
	272	-Wno-pci_device_bus_num \
	273	-Wno-pci_device_reg
bc553986 RH	274	endif
bc553986 RH	275
8654cb8d RH	276	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
	277	DTC_FLAGS += -Wnode_name_chars_strict \
	278	-Wproperty_name_chars_strict
bc553986 RH	279	endif
bc553986 RH	280
331f7416 FR	281	DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
331f7416 FR	282
aab94339	283	# Generate an assembly file to wrap the output of the device tree compiler
1c00a47e	284	quiet_cmd_dt_S_dtb= DTB $@
aab94339 DB	285	cmd_dt_S_dtb= \
	286	( \
	287	echo '\#include <asm-generic/vmlinux.lds.h>'; \
	288	echo '.section .dtb.init.rodata,"a"'; \
	289	echo '.balign STRUCT_ALIGNMENT'; \
bf86ca02 JH	290	echo '.global __dtb_$(subst -,_,$(*F))_begin'; \
bf86ca02 JH	291	echo '__dtb_$(subst -,_,$(*F))_begin:'; \
aab94339	292	echo '.incbin "$<" '; \
bf86ca02 JH	293	echo '__dtb_$(subst -,_,$(*F))_end:'; \
bf86ca02 JH	294	echo '.global __dtb_$(subst -,_,$(*F))_end'; \
aab94339 DB	295	echo '.balign STRUCT_ALIGNMENT'; \
	296	) > $@
	297
	298	$(obj)/%.dtb.S: $(obj)/%.dtb
	299	$(call cmd,dt_S_dtb)
	300
	301	quiet_cmd_dtc = DTC $@
77479b38 NR	302	cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
77479b38 NR	303	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
6b22b3d1	304	$(DTC) -O dtb -o $@ -b 0 \
50f9ddaf	305	$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
b0a4d8b3 IC	306	-d $(depfile).dtc.tmp $(dtc-tmp) ; \
b0a4d8b3 IC	307	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
1da177e4	308
90b335fb SW	309	$(obj)/%.dtb: $(src)/%.dts FORCE
	310	$(call if_changed_dep,dtc)
	311
b0a4d8b3	312	dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
22435f38	313
bc22c17e AK	314	# Bzip2
	315	# ---------------------------------------------------------------------------
	316
d3dd3b5a PA	317	# Bzip2 and LZMA do not include size in file... so we have to fake that;
d3dd3b5a PA	318	# append the size as a 32-bit littleendian number as gzip does.
4a2ff67c	319	size_append = printf $(shell \
d3dd3b5a PA	320	dec_size=0; \
	321	for F in $1; do \
	322	fsize=$$(stat -c "%s" $$F); \
	323	dec_size=$$(expr $$dec_size + $$fsize); \
	324	done; \
1373411a JN	325	printf "%08x\n" $$dec_size \| \
	326	sed 's/\(..\)/\1 /g' \| { \
	327	read ch0 ch1 ch2 ch3; \
	328	for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
	329	printf '%s%03o' '\\' $$((0x$$ch)); \
	330	done; \
	331	} \
d3dd3b5a PA	332	)
	333
	334	quiet_cmd_bzip2 = BZIP2 $@
	335	cmd_bzip2 = (cat $(filter-out FORCE,$^) \| \
	336	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	337	(rm -f $@ ; false)
bc22c17e AK	338
	339	# Lzma
	340	# ---------------------------------------------------------------------------
	341
	342	quiet_cmd_lzma = LZMA $@
d3dd3b5a PA	343	cmd_lzma = (cat $(filter-out FORCE,$^) \| \
	344	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	345	(rm -f $@ ; false)
7dd65feb	346
2d74b2c6	347	quiet_cmd_lzo = LZO $@
7dd65feb AT	348	cmd_lzo = (cat $(filter-out FORCE,$^) \| \
	349	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	350	(rm -f $@ ; false)
d61931d8	351
e76e1fdf KL	352	quiet_cmd_lz4 = LZ4 $@
	353	cmd_lz4 = (cat $(filter-out FORCE,$^) \| \
	354	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	355	(rm -f $@ ; false)
	356
e3393645 SW	357	# U-Boot mkimage
	358	# ---------------------------------------------------------------------------
	359
	360	MKIMAGE := $(srctree)/scripts/mkuboot.sh
	361
	362	# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
	363	# the number of overrides in arch makefiles
	364	UIMAGE_ARCH ?= $(SRCARCH)
	365	UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
	366	UIMAGE_OPTS-y ?=
	367	UIMAGE_TYPE ?= kernel
	368	UIMAGE_LOADADDR ?= arch_must_set_this
	369	UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
	370	UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
	371	UIMAGE_IN ?= $<
	372	UIMAGE_OUT ?= $@
	373
	374	quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
	375	cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
	376	-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
	377	-T $(UIMAGE_TYPE) \
	378	-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
	379	-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
	380
24fa0402 LC	381	# XZ
	382	# ---------------------------------------------------------------------------
	383	# Use xzkern to compress the kernel image and xzmisc to compress other things.
	384	#
	385	# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
	386	# of the kernel decompressor. A BCJ filter is used if it is available for
	387	# the target architecture. xzkern also appends uncompressed size of the data
	388	# using size_append. The .xz format has the size information available at
	389	# the end of the file too, but it's in more complex format and it's good to
	390	# avoid changing the part of the boot code that reads the uncompressed size.
	391	# Note that the bytes added by size_append will make the xz tool think that
	392	# the file is corrupt. This is expected.
	393	#
	394	# xzmisc doesn't use size_append, so it can be used to create normal .xz
	395	# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
	396	# big dictionary would increase the memory usage too much in the multi-call
	397	# decompression mode. A BCJ filter isn't used either.
	398	quiet_cmd_xzkern = XZKERN $@
	399	cmd_xzkern = (cat $(filter-out FORCE,$^) \| \
	400	sh $(srctree)/scripts/xz_wrap.sh && \
	401	$(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	402	(rm -f $@ ; false)
	403
	404	quiet_cmd_xzmisc = XZMISC $@
	405	cmd_xzmisc = (cat $(filter-out FORCE,$^) \| \
	406	xz --check=crc32 --lzma2=dict=1MiB) > $@ \|\| \
	407	(rm -f $@ ; false)
ebf003f0 MK	408
	409	# ASM offsets
	410	# ---------------------------------------------------------------------------
	411
	412	# Default sed regexp - multiline due to syntax constraints
cf0c3e68 JH	413	#
	414	# Use [:space:] because LLVM's integrated assembler inserts <tab> around
	415	# the .ascii directive whereas GCC keeps the <space> as-is.
ebf003f0	416	define sed-offsets
cf0c3e68 JH	417	's:^[[:space:]]\.ascii[[:space:]]"\(.\)".:\1:; \
cf0c3e68 JH	418	/^->/{s:->#\(.\):/ \1 */:; \
ebf003f0	419	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
cf0c3e68	420	s:->::; p;}'
ebf003f0 MK	421	endef
	422
	423	# Use filechk to avoid rebuilds when a header changes, but the resulting file
	424	# does not
	425	define filechk_offsets
	426	(set -e; \
	427	echo "#ifndef $2"; \
	428	echo "#define $2"; \
	429	echo "/*"; \
	430	echo " * DO NOT MODIFY."; \
	431	echo " *"; \
	432	echo " * This file was generated by Kbuild"; \
	433	echo " */"; \
	434	echo ""; \
	435	sed -ne $(sed-offsets); \
	436	echo ""; \
	437	echo "#endif" )
	438	endef