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 $(CFLAGS_KCOV)) 153endif 154 155# 156# Enable KCSAN flags except some files or directories we don't want to check 157# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE) 158# 159ifeq ($(CONFIG_KCSAN),y) 160_c_flags += $(if $(patsubst n%,, \ 161 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \ 162 $(CFLAGS_KCSAN)) 163endif 164 165# $(srctree)/$(src) for including checkin headers from generated source files 166# $(objtree)/$(obj) for including generated headers from checkin source files 167ifeq ($(KBUILD_EXTMOD),) 168ifdef building_out_of_srctree 169_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 170_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 171_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 172endif 173endif 174 175part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 176quiet_modtag = $(if $(part-of-module),[M], ) 177 178modkern_cflags = \ 179 $(if $(part-of-module), \ 180 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 181 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 182 183modkern_aflags = $(if $(part-of-module), \ 184 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 185 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) 186 187c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 188 -include $(srctree)/include/linux/compiler_types.h \ 189 $(_c_flags) $(modkern_cflags) \ 190 $(basename_flags) $(modname_flags) 191 192a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 193 $(_a_flags) $(modkern_aflags) 194 195cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 196 $(_cpp_flags) 197 198ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 199 200DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 201 202dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \ 203 $(addprefix -I,$(DTC_INCLUDE)) \ 204 -undef -D__DTS__ 205 206# Useful for describing the dependency of composite objects 207# Usage: 208# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 209define multi_depend 210$(foreach m, $(notdir $1), \ 211 $(eval $(obj)/$m: \ 212 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 213endef 214 215# Shipped files 216# =========================================================================== 217 218quiet_cmd_shipped = SHIPPED $@ 219cmd_shipped = cat $< > $@ 220 221$(obj)/%: $(src)/%_shipped 222 $(call cmd,shipped) 223 224# Commands useful for building a boot image 225# =========================================================================== 226# 227# Use as following: 228# 229# target: source(s) FORCE 230# $(if_changed,ld/objcopy/gzip) 231# 232# and add target to extra-y so that we know we have to 233# read in the saved command line 234 235# Linking 236# --------------------------------------------------------------------------- 237 238quiet_cmd_ld = LD $@ 239 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 240 241# Archive 242# --------------------------------------------------------------------------- 243 244quiet_cmd_ar = AR $@ 245 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 246 247# Objcopy 248# --------------------------------------------------------------------------- 249 250quiet_cmd_objcopy = OBJCOPY $@ 251cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 252 253# Gzip 254# --------------------------------------------------------------------------- 255 256quiet_cmd_gzip = GZIP $@ 257 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ 258 259# DTC 260# --------------------------------------------------------------------------- 261DTC ?= $(objtree)/scripts/dtc/dtc 262 263# Disable noisy checks by default 264ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) 265DTC_FLAGS += -Wno-unit_address_vs_reg \ 266 -Wno-unit_address_format \ 267 -Wno-avoid_unnecessary_addr_size \ 268 -Wno-alias_paths \ 269 -Wno-graph_child_address \ 270 -Wno-simple_bus_reg \ 271 -Wno-unique_unit_address \ 272 -Wno-pci_device_reg 273endif 274 275ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) 276DTC_FLAGS += -Wnode_name_chars_strict \ 277 -Wproperty_name_chars_strict 278endif 279 280DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 281 282# Generate an assembly file to wrap the output of the device tree compiler 283quiet_cmd_dt_S_dtb= DTB $@ 284cmd_dt_S_dtb= \ 285{ \ 286 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 287 echo '.section .dtb.init.rodata,"a"'; \ 288 echo '.balign STRUCT_ALIGNMENT'; \ 289 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ 290 echo '__dtb_$(subst -,_,$(*F))_begin:'; \ 291 echo '.incbin "$<" '; \ 292 echo '__dtb_$(subst -,_,$(*F))_end:'; \ 293 echo '.global __dtb_$(subst -,_,$(*F))_end'; \ 294 echo '.balign STRUCT_ALIGNMENT'; \ 295} > $@ 296 297$(obj)/%.dtb.S: $(obj)/%.dtb FORCE 298 $(call if_changed,dt_S_dtb) 299 300quiet_cmd_dtc = DTC $@ 301cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 302 $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 303 $(DTC) -O $(patsubst .%,%,$(suffix $@)) -o $@ -b 0 \ 304 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 305 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 306 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 307 308$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE 309 $(call if_changed_dep,dtc) 310 311DT_CHECKER ?= dt-validate 312DT_BINDING_DIR := Documentation/devicetree/bindings 313# DT_TMP_SCHEMA may be overridden from Documentation/devicetree/bindings/Makefile 314DT_TMP_SCHEMA ?= $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml 315 316quiet_cmd_dtb_check = CHECK $@ 317 cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ 318 319define rule_dtc 320 $(call cmd_and_fixdep,dtc) 321 $(call cmd,dtb_check) 322endef 323 324$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE 325 $(call if_changed_rule,dtc,yaml) 326 327dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 328 329# Bzip2 330# --------------------------------------------------------------------------- 331 332# Bzip2 and LZMA do not include size in file... so we have to fake that; 333# append the size as a 32-bit littleendian number as gzip does. 334size_append = printf $(shell \ 335dec_size=0; \ 336for F in $(real-prereqs); do \ 337 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 338 dec_size=$$(expr $$dec_size + $$fsize); \ 339done; \ 340printf "%08x\n" $$dec_size | \ 341 sed 's/\(..\)/\1 /g' | { \ 342 read ch0 ch1 ch2 ch3; \ 343 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 344 printf '%s%03o' '\\' $$((0x$$ch)); \ 345 done; \ 346 } \ 347) 348 349quiet_cmd_bzip2 = BZIP2 $@ 350 cmd_bzip2 = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@ 351 352# Lzma 353# --------------------------------------------------------------------------- 354 355quiet_cmd_lzma = LZMA $@ 356 cmd_lzma = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 357 358quiet_cmd_lzo = LZO $@ 359 cmd_lzo = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@ 360 361quiet_cmd_lz4 = LZ4 $@ 362 cmd_lz4 = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \ 363 $(size_append); } > $@ 364 365# U-Boot mkimage 366# --------------------------------------------------------------------------- 367 368MKIMAGE := $(srctree)/scripts/mkuboot.sh 369 370# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 371# the number of overrides in arch makefiles 372UIMAGE_ARCH ?= $(SRCARCH) 373UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 374UIMAGE_OPTS-y ?= 375UIMAGE_TYPE ?= kernel 376UIMAGE_LOADADDR ?= arch_must_set_this 377UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 378UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 379 380quiet_cmd_uimage = UIMAGE $@ 381 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 382 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 383 -T $(UIMAGE_TYPE) \ 384 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 385 -n $(UIMAGE_NAME) -d $< $@ 386 387# XZ 388# --------------------------------------------------------------------------- 389# Use xzkern to compress the kernel image and xzmisc to compress other things. 390# 391# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 392# of the kernel decompressor. A BCJ filter is used if it is available for 393# the target architecture. xzkern also appends uncompressed size of the data 394# using size_append. The .xz format has the size information available at 395# the end of the file too, but it's in more complex format and it's good to 396# avoid changing the part of the boot code that reads the uncompressed size. 397# Note that the bytes added by size_append will make the xz tool think that 398# the file is corrupt. This is expected. 399# 400# xzmisc doesn't use size_append, so it can be used to create normal .xz 401# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 402# big dictionary would increase the memory usage too much in the multi-call 403# decompression mode. A BCJ filter isn't used either. 404quiet_cmd_xzkern = XZKERN $@ 405 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 406 $(size_append); } > $@ 407 408quiet_cmd_xzmisc = XZMISC $@ 409 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 410 411# ASM offsets 412# --------------------------------------------------------------------------- 413 414# Default sed regexp - multiline due to syntax constraints 415# 416# Use [:space:] because LLVM's integrated assembler inserts <tab> around 417# the .ascii directive whereas GCC keeps the <space> as-is. 418define sed-offsets 419 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 420 /^->/{s:->#\(.*\):/* \1 */:; \ 421 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 422 s:->::; p;}' 423endef 424 425# Use filechk to avoid rebuilds when a header changes, but the resulting file 426# does not 427define filechk_offsets 428 echo "#ifndef $2"; \ 429 echo "#define $2"; \ 430 echo "/*"; \ 431 echo " * DO NOT MODIFY."; \ 432 echo " *"; \ 433 echo " * This file was generated by Kbuild"; \ 434 echo " */"; \ 435 echo ""; \ 436 sed -ne $(sed-offsets) < $<; \ 437 echo ""; \ 438 echo "#endif" 439endef 440