1# SPDX-License-Identifier: GPL-2.0 2# Backward compatibility 3asflags-y += $(EXTRA_AFLAGS) 4ccflags-y += $(EXTRA_CFLAGS) 5cppflags-y += $(EXTRA_CPPFLAGS) 6ldflags-y += $(EXTRA_LDFLAGS) 7ifneq ($(always),) 8$(warning 'always' is deprecated. Please use 'always-y' instead) 9always-y += $(always) 10endif 11ifneq ($(hostprogs-y),) 12$(warning 'hostprogs-y' is deprecated. Please use 'hostprogs' instead) 13hostprogs += $(hostprogs-y) 14endif 15ifneq ($(hostprogs-m),) 16$(warning 'hostprogs-m' is deprecated. Please use 'hostprogs' instead) 17hostprogs += $(hostprogs-m) 18endif 19 20# flags that take effect in current and sub directories 21KBUILD_AFLAGS += $(subdir-asflags-y) 22KBUILD_CFLAGS += $(subdir-ccflags-y) 23 24# Figure out what we need to build from the various variables 25# =========================================================================== 26 27# When an object is listed to be built compiled-in and modular, 28# only build the compiled-in version 29obj-m := $(filter-out $(obj-y),$(obj-m)) 30 31# Libraries are always collected in one lib file. 32# Filter out objects already built-in 33lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 34 35# Subdirectories we need to descend into 36subdir-ym := $(sort $(subdir-y) $(subdir-m) \ 37 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m)))) 38 39# Handle objects in subdirs: 40# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and 41# foo/modules.order 42# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order 43# 44# Generate modules.order to determine modorder. Unfortunately, we don't have 45# information about ordering between -y and -m subdirs. Just put -y's first. 46 47ifdef need-modorder 48obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m)) 49else 50obj-m := $(filter-out %/, $(obj-m)) 51endif 52 53ifdef need-builtin 54obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) 55else 56obj-y := $(filter-out %/, $(obj-y)) 57endif 58 59# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object 60multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m)))) 61multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m)))) 62multi-used := $(multi-used-y) $(multi-used-m) 63 64# Replace multi-part objects by their individual parts, 65# including built-in.a from subdirectories 66real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) 67real-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))) 68 69always-y += $(always-m) 70 71# DTB 72# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built 73extra-y += $(dtb-y) 74extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-) 75 76ifneq ($(CHECK_DTBS),) 77extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y)) 78extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-)) 79endif 80 81# Add subdir path 82 83extra-y := $(addprefix $(obj)/,$(extra-y)) 84always-y := $(addprefix $(obj)/,$(always-y)) 85targets := $(addprefix $(obj)/,$(targets)) 86obj-m := $(addprefix $(obj)/,$(obj-m)) 87lib-y := $(addprefix $(obj)/,$(lib-y)) 88real-obj-y := $(addprefix $(obj)/,$(real-obj-y)) 89real-obj-m := $(addprefix $(obj)/,$(real-obj-m)) 90multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) 91subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 92 93# Finds the multi-part object the current object will be linked into. 94# If the object belongs to two or more multi-part objects, list them all. 95modname-multi = $(sort $(foreach m,$(multi-used),\ 96 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))) 97 98__modname = $(if $(modname-multi),$(modname-multi),$(basetarget)) 99 100modname = $(subst $(space),:,$(__modname)) 101modfile = $(addprefix $(obj)/,$(__modname)) 102 103# target with $(obj)/ and its suffix stripped 104target-stem = $(basename $(patsubst $(obj)/%,%,$@)) 105 106# These flags are needed for modversions and compiling, so we define them here 107# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will 108# end up in (or would, if it gets compiled in) 109name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1))) 110basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 111modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) 112modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) 113 114orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \ 115 $(ccflags-y) $(CFLAGS_$(target-stem).o) 116_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags)) 117orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \ 118 $(asflags-y) $(AFLAGS_$(target-stem).o) 119_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags)) 120_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds) 121 122# 123# Enable gcov profiling flags for a file, directory or for all files depending 124# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 125# (in this order) 126# 127ifeq ($(CONFIG_GCOV_KERNEL),y) 128_c_flags += $(if $(patsubst n%,, \ 129 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 130 $(CFLAGS_GCOV)) 131endif 132 133# 134# Enable address sanitizer flags for kernel except some files or directories 135# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 136# 137ifeq ($(CONFIG_KASAN),y) 138_c_flags += $(if $(patsubst n%,, \ 139 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 140 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 141endif 142 143ifeq ($(CONFIG_UBSAN),y) 144_c_flags += $(if $(patsubst n%,, \ 145 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ 146 $(CFLAGS_UBSAN)) 147endif 148 149ifeq ($(CONFIG_KCOV),y) 150_c_flags += $(if $(patsubst n%,, \ 151 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ 152 $(CFLAGS_KCOV)) 153endif 154 155# $(srctree)/$(src) for including checkin headers from generated source files 156# $(objtree)/$(obj) for including generated headers from checkin source files 157ifeq ($(KBUILD_EXTMOD),) 158ifdef building_out_of_srctree 159_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 160_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 161_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 162endif 163endif 164 165part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 166quiet_modtag = $(if $(part-of-module),[M], ) 167 168modkern_cflags = \ 169 $(if $(part-of-module), \ 170 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 171 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 172 173modkern_aflags = $(if $(part-of-module), \ 174 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 175 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) 176 177c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 178 -include $(srctree)/include/linux/compiler_types.h \ 179 $(_c_flags) $(modkern_cflags) \ 180 $(basename_flags) $(modname_flags) 181 182a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 183 $(_a_flags) $(modkern_aflags) 184 185cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 186 $(_cpp_flags) 187 188ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 189 190DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 191 192dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \ 193 $(addprefix -I,$(DTC_INCLUDE)) \ 194 -undef -D__DTS__ 195 196# Useful for describing the dependency of composite objects 197# Usage: 198# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 199define multi_depend 200$(foreach m, $(notdir $1), \ 201 $(eval $(obj)/$m: \ 202 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 203endef 204 205# Shipped files 206# =========================================================================== 207 208quiet_cmd_shipped = SHIPPED $@ 209cmd_shipped = cat $< > $@ 210 211$(obj)/%: $(src)/%_shipped 212 $(call cmd,shipped) 213 214# Commands useful for building a boot image 215# =========================================================================== 216# 217# Use as following: 218# 219# target: source(s) FORCE 220# $(if_changed,ld/objcopy/gzip) 221# 222# and add target to extra-y so that we know we have to 223# read in the saved command line 224 225# Linking 226# --------------------------------------------------------------------------- 227 228quiet_cmd_ld = LD $@ 229 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 230 231# Archive 232# --------------------------------------------------------------------------- 233 234quiet_cmd_ar = AR $@ 235 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 236 237# Objcopy 238# --------------------------------------------------------------------------- 239 240quiet_cmd_objcopy = OBJCOPY $@ 241cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 242 243# Gzip 244# --------------------------------------------------------------------------- 245 246quiet_cmd_gzip = GZIP $@ 247 cmd_gzip = cat $(real-prereqs) | $(_GZIP) -n -f -9 > $@ 248 249# DTC 250# --------------------------------------------------------------------------- 251DTC ?= $(objtree)/scripts/dtc/dtc 252 253# Disable noisy checks by default 254ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) 255DTC_FLAGS += -Wno-unit_address_vs_reg \ 256 -Wno-unit_address_format \ 257 -Wno-avoid_unnecessary_addr_size \ 258 -Wno-alias_paths \ 259 -Wno-graph_child_address \ 260 -Wno-simple_bus_reg \ 261 -Wno-unique_unit_address \ 262 -Wno-pci_device_reg 263endif 264 265ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) 266DTC_FLAGS += -Wnode_name_chars_strict \ 267 -Wproperty_name_chars_strict 268endif 269 270DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 271 272# Generate an assembly file to wrap the output of the device tree compiler 273quiet_cmd_dt_S_dtb= DTB $@ 274cmd_dt_S_dtb= \ 275{ \ 276 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 277 echo '.section .dtb.init.rodata,"a"'; \ 278 echo '.balign STRUCT_ALIGNMENT'; \ 279 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ 280 echo '__dtb_$(subst -,_,$(*F))_begin:'; \ 281 echo '.incbin "$<" '; \ 282 echo '__dtb_$(subst -,_,$(*F))_end:'; \ 283 echo '.global __dtb_$(subst -,_,$(*F))_end'; \ 284 echo '.balign STRUCT_ALIGNMENT'; \ 285} > $@ 286 287$(obj)/%.dtb.S: $(obj)/%.dtb FORCE 288 $(call if_changed,dt_S_dtb) 289 290quiet_cmd_dtc = DTC $@ 291cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 292 $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 293 $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \ 294 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 295 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 296 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 297 298$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE 299 $(call if_changed_dep,dtc) 300 301DT_CHECKER ?= dt-validate 302DT_BINDING_DIR := Documentation/devicetree/bindings 303# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile 304DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml 305 306quiet_cmd_dtb_check = CHECK $@ 307 cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ 308 309define rule_dtc 310 $(call cmd_and_fixdep,dtc) 311 $(call cmd,dtb_check) 312endef 313 314$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE 315 $(call if_changed_rule,dtc,yaml) 316 317dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 318 319# Bzip2 320# --------------------------------------------------------------------------- 321 322# Bzip2 and LZMA do not include size in file... so we have to fake that; 323# append the size as a 32-bit littleendian number as gzip does. 324size_append = printf $(shell \ 325dec_size=0; \ 326for F in $(real-prereqs); do \ 327 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 328 dec_size=$$(expr $$dec_size + $$fsize); \ 329done; \ 330printf "%08x\n" $$dec_size | \ 331 sed 's/\(..\)/\1 /g' | { \ 332 read ch0 ch1 ch2 ch3; \ 333 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 334 printf '%s%03o' '\\' $$((0x$$ch)); \ 335 done; \ 336 } \ 337) 338 339quiet_cmd_bzip2 = BZIP2 $@ 340 cmd_bzip2 = { cat $(real-prereqs) | $(_BZIP2) -9; $(size_append); } > $@ 341 342# Lzma 343# --------------------------------------------------------------------------- 344 345quiet_cmd_lzma = LZMA $@ 346 cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 347 348quiet_cmd_lzo = LZO $@ 349 cmd_lzo = { cat $(real-prereqs) | $(_LZOP) -9; $(size_append); } > $@ 350 351quiet_cmd_lz4 = LZ4 $@ 352 cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \ 353 $(size_append); } > $@ 354 355# U-Boot mkimage 356# --------------------------------------------------------------------------- 357 358MKIMAGE := $(srctree)/scripts/mkuboot.sh 359 360# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 361# the number of overrides in arch makefiles 362UIMAGE_ARCH ?= $(SRCARCH) 363UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 364UIMAGE_OPTS-y ?= 365UIMAGE_TYPE ?= kernel 366UIMAGE_LOADADDR ?= arch_must_set_this 367UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 368UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 369 370quiet_cmd_uimage = UIMAGE $@ 371 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 372 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 373 -T $(UIMAGE_TYPE) \ 374 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 375 -n $(UIMAGE_NAME) -d $< $@ 376 377# XZ 378# --------------------------------------------------------------------------- 379# Use xzkern to compress the kernel image and xzmisc to compress other things. 380# 381# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 382# of the kernel decompressor. A BCJ filter is used if it is available for 383# the target architecture. xzkern also appends uncompressed size of the data 384# using size_append. The .xz format has the size information available at 385# the end of the file too, but it's in more complex format and it's good to 386# avoid changing the part of the boot code that reads the uncompressed size. 387# Note that the bytes added by size_append will make the xz tool think that 388# the file is corrupt. This is expected. 389# 390# xzmisc doesn't use size_append, so it can be used to create normal .xz 391# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 392# big dictionary would increase the memory usage too much in the multi-call 393# decompression mode. A BCJ filter isn't used either. 394quiet_cmd_xzkern = XZKERN $@ 395 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 396 $(size_append); } > $@ 397 398quiet_cmd_xzmisc = XZMISC $@ 399 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 400 401# ASM offsets 402# --------------------------------------------------------------------------- 403 404# Default sed regexp - multiline due to syntax constraints 405# 406# Use [:space:] because LLVM's integrated assembler inserts <tab> around 407# the .ascii directive whereas GCC keeps the <space> as-is. 408define sed-offsets 409 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 410 /^->/{s:->#\(.*\):/* \1 */:; \ 411 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 412 s:->::; p;}' 413endef 414 415# Use filechk to avoid rebuilds when a header changes, but the resulting file 416# does not 417define filechk_offsets 418 echo "#ifndef $2"; \ 419 echo "#define $2"; \ 420 echo "/*"; \ 421 echo " * DO NOT MODIFY."; \ 422 echo " *"; \ 423 echo " * This file was generated by Kbuild"; \ 424 echo " */"; \ 425 echo ""; \ 426 sed -ne $(sed-offsets) < $<; \ 427 echo ""; \ 428 echo "#endif" 429endef 430