[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 sub directories
export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(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)))


# 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)

# 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))

__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) 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)))
multi-objs   := $(multi-objs-y) $(multi-objs-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.o, $(obj-y))

# $(obj-dirs) is a list of directories that contain object files
obj-dirs := $(dir $(multi-objs) $(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))) $(extra-y)
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))
obj-dirs	:= $(addprefix $(obj)/,$(obj-dirs))

# These flags are needed for modversions and compiling, so we define them here
# already
# $(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) $(KBUILD_SUBDIR_CCFLAGS) \
                 $(ccflags-y) $(CFLAGS_$(basetarget).o)
_c_flags       = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
orig_a_flags   = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
                 $(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))
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     $@
cmd_dt_S_dtb=						\
(							\
	echo '\#include <asm-generic/vmlinux.lds.h>'; 	\
	echo '.section .dtb.init.rodata,"a"';		\
	echo '.balign STRUCT_ALIGNMENT';		\
	echo '.global __dtb_$(*F)_begin';		\
	echo '__dtb_$(*F)_begin:';			\
	echo '.incbin "$<" ';				\
	echo '__dtb_$(*F)_end:';			\
	echo '.global __dtb_$(*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
720097d8 SR	8	#
	9	# flags that take effect in sub directories
	10	export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y)
	11	export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y)
	12
1da177e4 LT	13	# Figure out what we need to build from the various variables
	14	# ===========================================================================
	15
	16	# When an object is listed to be built compiled-in and modular,
	17	# only build the compiled-in version
	18
	19	obj-m := $(filter-out $(obj-y),$(obj-m))
	20
	21	# Libraries are always collected in one lib file.
	22	# Filter out objects already built-in
	23
	24	lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m)))
	25
	26
	27	# Handle objects in subdirs
	28	# ---------------------------------------------------------------------------
	29	# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o
	30	# and add the directory to the list of dirs to descend into: $(subdir-y)
38385f8f	31	# o if we encounter foo/ in $(obj-m), remove it from $(obj-m)
1da177e4 LT	32	# and add the directory to the list of dirs to descend into: $(subdir-m)
1da177e4 LT	33
551559e1 TH	34	# Determine modorder.
	35	# Unfortunately, we don't have information about ordering between -y
	36	# and -m subdirs. Just put -y's first.
	37	modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko))
	38
1da177e4 LT	39	__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
	40	subdir-y += $(__subdir-y)
	41	__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
	42	subdir-m += $(__subdir-m)
	43	obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
	44	obj-m := $(filter-out %/, $(obj-m))
	45
	46	# Subdirectories we need to descend into
	47
	48	subdir-ym := $(sort $(subdir-y) $(subdir-m))
	49
38385f8f	50	# if $(foo-objs) exists, foo.o is a composite object
1da177e4	51	multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
cf4f2193	52	multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m))))
1da177e4 LT	53	multi-used := $(multi-used-y) $(multi-used-m)
	54	single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m)))
	55
	56	# Build list of the parts of our composite objects, our composite
	57	# objects depend on those (obviously)
	58	multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y)))
	59	multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y)))
	60	multi-objs := $(multi-objs-y) $(multi-objs-m)
	61
f5fb9765 SR	62	# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to
	63	# tell kbuild to descend
	64	subdir-obj-y := $(filter %/built-in.o, $(obj-y))
1da177e4 LT	65
1da177e4 LT	66	# $(obj-dirs) is a list of directories that contain object files
4d47dde4	67	obj-dirs := $(dir $(multi-objs) $(obj-y))
1da177e4 LT	68
	69	# Replace multi-part objects by their individual parts, look at local dir only
	70	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))) $(extra-y)
cf4f2193	71	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	72
7e7962dd MY	73	# DTB
	74	# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built
	75	extra-y += $(dtb-y)
	76	extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-)
	77
1da177e4 LT	78	# Add subdir path
	79
	80	extra-y := $(addprefix $(obj)/,$(extra-y))
	81	always := $(addprefix $(obj)/,$(always))
	82	targets := $(addprefix $(obj)/,$(targets))
551559e1	83	modorder := $(addprefix $(obj)/,$(modorder))
1da177e4 LT	84	obj-y := $(addprefix $(obj)/,$(obj-y))
	85	obj-m := $(addprefix $(obj)/,$(obj-m))
	86	lib-y := $(addprefix $(obj)/,$(lib-y))
	87	subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
	88	real-objs-y := $(addprefix $(obj)/,$(real-objs-y))
	89	real-objs-m := $(addprefix $(obj)/,$(real-objs-m))
	90	single-used-m := $(addprefix $(obj)/,$(single-used-m))
	91	multi-used-y := $(addprefix $(obj)/,$(multi-used-y))
	92	multi-used-m := $(addprefix $(obj)/,$(multi-used-m))
	93	multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y))
	94	multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m))
	95	subdir-ym := $(addprefix $(obj)/,$(subdir-ym))
	96	obj-dirs := $(addprefix $(obj)/,$(obj-dirs))
	97
1da177e4 LT	98	# These flags are needed for modversions and compiling, so we define them here
1da177e4 LT	99	# already
38385f8f	100	# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will
1da177e4	101	# end up in (or would, if it gets compiled in)
5bb0571b MM	102	# Note: Files that end up in two or more modules are compiled without the
	103	# KBUILD_MODNAME definition. The reason is that any made-up name would
	104	# differ in different configs.
b42841b7 MM	105	name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote)
b42841b7 MM	106	basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget))
f83b5e32	107	modname_flags = $(if $(filter 1,$(words $(modname))),\
b42841b7	108	-DKBUILD_MODNAME=$(call name-fix,$(modname)))
1da177e4	109
720097d8	110	orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \
d8672b40	111	$(ccflags-y) $(CFLAGS_$(basetarget).o)
656ee82c	112	_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags))
a7e137eb	113	orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \
d8672b40	114	$(asflags-y) $(AFLAGS_$(basetarget).o)
a7e137eb	115	_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags))
f77bf014	116	_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F))
1da177e4	117
2521f2c2 PO	118	#
	119	# Enable gcov profiling flags for a file, directory or for all files depending
	120	# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL
	121	# (in this order)
	122	#
	123	ifeq ($(CONFIG_GCOV_KERNEL),y)
	124	_c_flags += $(if $(patsubst n%,, \
	125	$(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \
	126	$(CFLAGS_GCOV))
	127	endif
	128
0b24becc AR	129	#
	130	# Enable address sanitizer flags for kernel except some files or directories
	131	# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE)
	132	#
	133	ifeq ($(CONFIG_KASAN),y)
	134	_c_flags += $(if $(patsubst n%,, \
	135	$(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \
	136	$(CFLAGS_KASAN))
	137	endif
	138
c6d30853 AR	139	ifeq ($(CONFIG_UBSAN),y)
	140	_c_flags += $(if $(patsubst n%,, \
	141	$(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \
	142	$(CFLAGS_UBSAN))
	143	endif
	144
5c9a8750 DV	145	ifeq ($(CONFIG_KCOV),y)
5c9a8750 DV	146	_c_flags += $(if $(patsubst n%,, \
a4691dea	147	$(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \
5c9a8750 DV	148	$(CFLAGS_KCOV))
	149	endif
	150
1da177e4 LT	151	# If building the kernel in a separate objtree expand all occurrences
	152	# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/').
	153
	154	ifeq ($(KBUILD_SRC),)
	155	__c_flags = $(_c_flags)
	156	__a_flags = $(_a_flags)
	157	__cpp_flags = $(_cpp_flags)
	158	else
	159
1da177e4 LT	160	# -I$(obj) locates generated .h files
	161	# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files
	162	# and locates generated .h files
	163	# FIXME: Replace both with specific CFLAGS* statements in the makefiles
4607ebf0	164	__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \
db547ef1 AB	165	$(call flags,_c_flags)
	166	__a_flags = $(call flags,_a_flags)
	167	__cpp_flags = $(call flags,_cpp_flags)
1da177e4 LT	168	endif
1da177e4 LT	169
d8672b40 SR	170	c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
d8672b40 SR	171	$(__c_flags) $(modkern_cflags) \
b42841b7	172	$(basename_flags) $(modname_flags)
1da177e4	173
d8672b40	174	a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
1da177e4 LT	175	$(__a_flags) $(modkern_aflags)
1da177e4 LT	176
d8672b40 SR	177	cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \
d8672b40 SR	178	$(__cpp_flags)
1da177e4	179
f77bf014	180	ld_flags = $(LDFLAGS) $(ldflags-y)
1da177e4	181
50f9ddaf MY	182	DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes
50f9ddaf MY	183
b0a4d8b3	184	dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \
50f9ddaf	185	$(addprefix -I,$(DTC_INCLUDE)) \
e570d7c1 SW	186	-undef -D__DTS__
e570d7c1 SW	187
1da177e4 LT	188	# Finds the multi-part object the current object will be linked into
	189	modname-multi = $(sort $(foreach m,$(multi-used),\
	190	$(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=))))
	191
c8589d1e MY	192	# Useful for describing the dependency of composite objects
	193	# Usage:
	194	# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add)
	195	define multi_depend
	196	$(foreach m, $(notdir $1), \
	197	$(eval $(obj)/$m: \
	198	$(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s)))))))
	199	endef
	200
7373f4f8 AL	201	ifdef REGENERATE_PARSERS
7373f4f8 AL	202
7373f4f8 AL	203	# LEX
	204	# ---------------------------------------------------------------------------
	205	LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy)
	206
	207	quiet_cmd_flex = LEX $@
	208	cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $<
	209
58238c81	210	.PRECIOUS: $(src)/%.lex.c_shipped
7373f4f8 AL	211	$(src)/%.lex.c_shipped: $(src)/%.l
	212	$(call cmd,flex)
	213
	214	# YACC
	215	# ---------------------------------------------------------------------------
	216	YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy)
	217
	218	quiet_cmd_bison = YACC $@
	219	cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $<
	220
58238c81	221	.PRECIOUS: $(src)/%.tab.c_shipped
7373f4f8 AL	222	$(src)/%.tab.c_shipped: $(src)/%.y
	223	$(call cmd,bison)
	224
	225	quiet_cmd_bison_h = YACC $@
	226	cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $<
	227
58238c81	228	.PRECIOUS: $(src)/%.tab.h_shipped
7373f4f8 AL	229	$(src)/%.tab.h_shipped: $(src)/%.y
	230	$(call cmd,bison_h)
	231
	232	endif
	233
1da177e4 LT	234	# Shipped files
	235	# ===========================================================================
	236
	237	quiet_cmd_shipped = SHIPPED $@
	238	cmd_shipped = cat $< > $@
	239
991d76c9	240	$(obj)/%: $(src)/%_shipped
1da177e4 LT	241	$(call cmd,shipped)
	242
	243	# Commands useful for building a boot image
	244	# ===========================================================================
38385f8f	245	#
1da177e4 LT	246	# Use as following:
	247	#
	248	# target: source(s) FORCE
	249	# $(if_changed,ld/objcopy/gzip)
	250	#
836caba7	251	# and add target to extra-y so that we know we have to
1da177e4 LT	252	# read in the saved command line
	253
	254	# Linking
	255	# ---------------------------------------------------------------------------
	256
	257	quiet_cmd_ld = LD $@
f77bf014	258	cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \
38385f8f	259	$(filter-out FORCE,$^) -o $@
1da177e4 LT	260
	261	# Objcopy
	262	# ---------------------------------------------------------------------------
	263
	264	quiet_cmd_objcopy = OBJCOPY $@
	265	cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@
	266
	267	# Gzip
	268	# ---------------------------------------------------------------------------
	269
	270	quiet_cmd_gzip = GZIP $@
6ae9ecb8	271	cmd_gzip = (cat $(filter-out FORCE,$^) \| gzip -n -f -9 > $@) \|\| \
d3dd3b5a	272	(rm -f $@ ; false)
1da177e4	273
aab94339 DB	274	# DTC
aab94339 DB	275	# ---------------------------------------------------------------------------
6b22b3d1	276	DTC ?= $(objtree)/scripts/dtc/dtc
aab94339	277
bc553986 RH	278	# Disable noisy checks by default
bc553986 RH	279	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),)
8654cb8d RH	280	DTC_FLAGS += -Wno-unit_address_vs_reg \
	281	-Wno-simple_bus_reg \
	282	-Wno-unit_address_format \
	283	-Wno-pci_bridge \
	284	-Wno-pci_device_bus_num \
	285	-Wno-pci_device_reg
bc553986 RH	286	endif
bc553986 RH	287
8654cb8d RH	288	ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2)
	289	DTC_FLAGS += -Wnode_name_chars_strict \
	290	-Wproperty_name_chars_strict
bc553986 RH	291	endif
bc553986 RH	292
331f7416 FR	293	DTC_FLAGS += $(DTC_FLAGS_$(basetarget))
331f7416 FR	294
aab94339	295	# Generate an assembly file to wrap the output of the device tree compiler
1c00a47e	296	quiet_cmd_dt_S_dtb= DTB $@
aab94339 DB	297	cmd_dt_S_dtb= \
	298	( \
	299	echo '\#include <asm-generic/vmlinux.lds.h>'; \
	300	echo '.section .dtb.init.rodata,"a"'; \
	301	echo '.balign STRUCT_ALIGNMENT'; \
	302	echo '.global __dtb_$(*F)_begin'; \
	303	echo '__dtb_$(*F)_begin:'; \
	304	echo '.incbin "$<" '; \
	305	echo '__dtb_$(*F)_end:'; \
	306	echo '.global __dtb_$(*F)_end'; \
	307	echo '.balign STRUCT_ALIGNMENT'; \
	308	) > $@
	309
	310	$(obj)/%.dtb.S: $(obj)/%.dtb
	311	$(call cmd,dt_S_dtb)
	312
	313	quiet_cmd_dtc = DTC $@
77479b38 NR	314	cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \
77479b38 NR	315	$(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \
6b22b3d1	316	$(DTC) -O dtb -o $@ -b 0 \
50f9ddaf	317	$(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \
b0a4d8b3 IC	318	-d $(depfile).dtc.tmp $(dtc-tmp) ; \
b0a4d8b3 IC	319	cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile)
1da177e4	320
90b335fb SW	321	$(obj)/%.dtb: $(src)/%.dts FORCE
	322	$(call if_changed_dep,dtc)
	323
b0a4d8b3	324	dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
22435f38	325
bc22c17e AK	326	# Bzip2
	327	# ---------------------------------------------------------------------------
	328
d3dd3b5a PA	329	# Bzip2 and LZMA do not include size in file... so we have to fake that;
d3dd3b5a PA	330	# append the size as a 32-bit littleendian number as gzip does.
4a2ff67c	331	size_append = printf $(shell \
d3dd3b5a PA	332	dec_size=0; \
	333	for F in $1; do \
	334	fsize=$$(stat -c "%s" $$F); \
	335	dec_size=$$(expr $$dec_size + $$fsize); \
	336	done; \
1373411a JN	337	printf "%08x\n" $$dec_size \| \
	338	sed 's/\(..\)/\1 /g' \| { \
	339	read ch0 ch1 ch2 ch3; \
	340	for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \
	341	printf '%s%03o' '\\' $$((0x$$ch)); \
	342	done; \
	343	} \
d3dd3b5a PA	344	)
	345
	346	quiet_cmd_bzip2 = BZIP2 $@
	347	cmd_bzip2 = (cat $(filter-out FORCE,$^) \| \
	348	bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	349	(rm -f $@ ; false)
bc22c17e AK	350
	351	# Lzma
	352	# ---------------------------------------------------------------------------
	353
	354	quiet_cmd_lzma = LZMA $@
d3dd3b5a PA	355	cmd_lzma = (cat $(filter-out FORCE,$^) \| \
	356	lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	357	(rm -f $@ ; false)
7dd65feb	358
2d74b2c6	359	quiet_cmd_lzo = LZO $@
7dd65feb AT	360	cmd_lzo = (cat $(filter-out FORCE,$^) \| \
	361	lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	362	(rm -f $@ ; false)
d61931d8	363
e76e1fdf KL	364	quiet_cmd_lz4 = LZ4 $@
	365	cmd_lz4 = (cat $(filter-out FORCE,$^) \| \
	366	lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	367	(rm -f $@ ; false)
	368
e3393645 SW	369	# U-Boot mkimage
	370	# ---------------------------------------------------------------------------
	371
	372	MKIMAGE := $(srctree)/scripts/mkuboot.sh
	373
	374	# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces
	375	# the number of overrides in arch makefiles
	376	UIMAGE_ARCH ?= $(SRCARCH)
	377	UIMAGE_COMPRESSION ?= $(if $(2),$(2),none)
	378	UIMAGE_OPTS-y ?=
	379	UIMAGE_TYPE ?= kernel
	380	UIMAGE_LOADADDR ?= arch_must_set_this
	381	UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR)
	382	UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)'
	383	UIMAGE_IN ?= $<
	384	UIMAGE_OUT ?= $@
	385
	386	quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT)
	387	cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \
	388	-C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \
	389	-T $(UIMAGE_TYPE) \
	390	-a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \
	391	-n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT)
	392
24fa0402 LC	393	# XZ
	394	# ---------------------------------------------------------------------------
	395	# Use xzkern to compress the kernel image and xzmisc to compress other things.
	396	#
	397	# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage
	398	# of the kernel decompressor. A BCJ filter is used if it is available for
	399	# the target architecture. xzkern also appends uncompressed size of the data
	400	# using size_append. The .xz format has the size information available at
	401	# the end of the file too, but it's in more complex format and it's good to
	402	# avoid changing the part of the boot code that reads the uncompressed size.
	403	# Note that the bytes added by size_append will make the xz tool think that
	404	# the file is corrupt. This is expected.
	405	#
	406	# xzmisc doesn't use size_append, so it can be used to create normal .xz
	407	# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very
	408	# big dictionary would increase the memory usage too much in the multi-call
	409	# decompression mode. A BCJ filter isn't used either.
	410	quiet_cmd_xzkern = XZKERN $@
	411	cmd_xzkern = (cat $(filter-out FORCE,$^) \| \
	412	sh $(srctree)/scripts/xz_wrap.sh && \
	413	$(call size_append, $(filter-out FORCE,$^))) > $@ \|\| \
	414	(rm -f $@ ; false)
	415
	416	quiet_cmd_xzmisc = XZMISC $@
	417	cmd_xzmisc = (cat $(filter-out FORCE,$^) \| \
	418	xz --check=crc32 --lzma2=dict=1MiB) > $@ \|\| \
	419	(rm -f $@ ; false)
ebf003f0 MK	420
	421	# ASM offsets
	422	# ---------------------------------------------------------------------------
	423
	424	# Default sed regexp - multiline due to syntax constraints
cf0c3e68 JH	425	#
	426	# Use [:space:] because LLVM's integrated assembler inserts <tab> around
	427	# the .ascii directive whereas GCC keeps the <space> as-is.
ebf003f0	428	define sed-offsets
cf0c3e68 JH	429	's:^[[:space:]]\.ascii[[:space:]]"\(.\)".:\1:; \
cf0c3e68 JH	430	/^->/{s:->#\(.\):/ \1 */:; \
ebf003f0	431	s:^->\([^ ]\) [\$$#]\([^ ]\) \(.\):#define \1 \2 /* \3 */:; \
cf0c3e68	432	s:->::; p;}'
ebf003f0 MK	433	endef
	434
	435	# Use filechk to avoid rebuilds when a header changes, but the resulting file
	436	# does not
	437	define filechk_offsets
	438	(set -e; \
	439	echo "#ifndef $2"; \
	440	echo "#define $2"; \
	441	echo "/*"; \
	442	echo " * DO NOT MODIFY."; \
	443	echo " *"; \
	444	echo " * This file was generated by Kbuild"; \
	445	echo " */"; \
	446	echo ""; \
	447	sed -ne $(sed-offsets); \
	448	echo ""; \
	449	echo "#endif" )
	450	endef