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) 7always-y += $(always) 8hostprogs += $(hostprogs-y) $(hostprogs-m) 9 10# flags that take effect in current and sub directories 11KBUILD_AFLAGS += $(subdir-asflags-y) 12KBUILD_CFLAGS += $(subdir-ccflags-y) 13 14# Figure out what we need to build from the various variables 15# =========================================================================== 16 17# When an object is listed to be built compiled-in and modular, 18# only build the compiled-in version 19obj-m := $(filter-out $(obj-y),$(obj-m)) 20 21# Libraries are always collected in one lib file. 22# Filter out objects already built-in 23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 24 25# Determine modorder. 26# Unfortunately, we don't have information about ordering between -y 27# and -m subdirs. Just put -y's first. 28modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) 29 30# Handle objects in subdirs 31# --------------------------------------------------------------------------- 32# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.a 33# and add the directory to the list of dirs to descend into: $(subdir-y) 34# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 35# and add the directory to the list of dirs to descend into: $(subdir-m) 36__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 37subdir-y += $(__subdir-y) 38__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) 39subdir-m += $(__subdir-m) 40ifdef need-builtin 41obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) 42else 43obj-y := $(filter-out %/, $(obj-y)) 44endif 45obj-m := $(filter-out %/, $(obj-m)) 46 47# Subdirectories we need to descend into 48subdir-ym := $(sort $(subdir-y) $(subdir-m)) 49 50# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object 51multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))), $(m)))) 52multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m)) $($(m:.o=-))), $(m)))) 53multi-used := $(multi-used-y) $(multi-used-m) 54 55# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to 56# tell kbuild to descend 57subdir-obj-y := $(filter %/built-in.a, $(obj-y)) 58 59# Replace multi-part objects by their individual parts, 60# including built-in.a from subdirectories 61real-obj-y := $(foreach m, $(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) 62real-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))) 63 64always-y += $(always-m) 65 66# DTB 67# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built 68extra-y += $(dtb-y) 69extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-) 70 71ifneq ($(CHECK_DTBS),) 72extra-y += $(patsubst %.dtb,%.dt.yaml, $(dtb-y)) 73extra-$(CONFIG_OF_ALL_DTBS) += $(patsubst %.dtb,%.dt.yaml, $(dtb-)) 74endif 75 76# Add subdir path 77 78extra-y := $(addprefix $(obj)/,$(extra-y)) 79always-y := $(addprefix $(obj)/,$(always-y)) 80targets := $(addprefix $(obj)/,$(targets)) 81modorder := $(addprefix $(obj)/,$(modorder)) 82obj-m := $(addprefix $(obj)/,$(obj-m)) 83lib-y := $(addprefix $(obj)/,$(lib-y)) 84subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) 85real-obj-y := $(addprefix $(obj)/,$(real-obj-y)) 86real-obj-m := $(addprefix $(obj)/,$(real-obj-m)) 87multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) 88subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 89 90# Finds the multi-part object the current object will be linked into. 91# If the object belongs to two or more multi-part objects, list them all. 92modname-multi = $(sort $(foreach m,$(multi-used),\ 93 $(if $(filter $*.o, $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))),$(m:.o=)))) 94 95__modname = $(if $(modname-multi),$(modname-multi),$(basetarget)) 96 97modname = $(subst $(space),:,$(__modname)) 98modfile = $(addprefix $(obj)/,$(__modname)) 99 100# target with $(obj)/ and its suffix stripped 101target-stem = $(basename $(patsubst $(obj)/%,%,$@)) 102 103# These flags are needed for modversions and compiling, so we define them here 104# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will 105# end up in (or would, if it gets compiled in) 106name-fix = $(call stringify,$(subst $(comma),_,$(subst -,_,$1))) 107basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 108modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) 109modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) 110 111orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) \ 112 $(ccflags-y) $(CFLAGS_$(target-stem).o) 113_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), $(orig_c_flags)) 114orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) \ 115 $(asflags-y) $(AFLAGS_$(target-stem).o) 116_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), $(orig_a_flags)) 117_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds) 118 119# 120# Enable gcov profiling flags for a file, directory or for all files depending 121# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 122# (in this order) 123# 124ifeq ($(CONFIG_GCOV_KERNEL),y) 125_c_flags += $(if $(patsubst n%,, \ 126 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 127 $(CFLAGS_GCOV)) 128endif 129 130# 131# Enable address sanitizer flags for kernel except some files or directories 132# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 133# 134ifeq ($(CONFIG_KASAN),y) 135_c_flags += $(if $(patsubst n%,, \ 136 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 137 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 138endif 139 140ifeq ($(CONFIG_UBSAN),y) 141_c_flags += $(if $(patsubst n%,, \ 142 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ 143 $(CFLAGS_UBSAN)) 144endif 145 146ifeq ($(CONFIG_KCOV),y) 147_c_flags += $(if $(patsubst n%,, \ 148 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ 149 $(CFLAGS_KCOV)) 150endif 151 152# $(srctree)/$(src) for including checkin headers from generated source files 153# $(objtree)/$(obj) for including generated headers from checkin source files 154ifeq ($(KBUILD_EXTMOD),) 155ifdef building_out_of_srctree 156_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 157_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 158_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 159endif 160endif 161 162part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 163quiet_modtag = $(if $(part-of-module),[M], ) 164 165modkern_cflags = \ 166 $(if $(part-of-module), \ 167 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 168 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 169 170modkern_aflags = $(if $(part-of-module), \ 171 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 172 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) 173 174c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 175 -include $(srctree)/include/linux/compiler_types.h \ 176 $(_c_flags) $(modkern_cflags) \ 177 $(basename_flags) $(modname_flags) 178 179a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 180 $(_a_flags) $(modkern_aflags) 181 182cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 183 $(_cpp_flags) 184 185ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 186 187DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 188 189dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 190 $(addprefix -I,$(DTC_INCLUDE)) \ 191 -undef -D__DTS__ 192 193# Useful for describing the dependency of composite objects 194# Usage: 195# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 196define multi_depend 197$(foreach m, $(notdir $1), \ 198 $(eval $(obj)/$m: \ 199 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 200endef 201 202# Shipped files 203# =========================================================================== 204 205quiet_cmd_shipped = SHIPPED $@ 206cmd_shipped = cat $< > $@ 207 208$(obj)/%: $(src)/%_shipped 209 $(call cmd,shipped) 210 211# Commands useful for building a boot image 212# =========================================================================== 213# 214# Use as following: 215# 216# target: source(s) FORCE 217# $(if_changed,ld/objcopy/gzip) 218# 219# and add target to extra-y so that we know we have to 220# read in the saved command line 221 222# Linking 223# --------------------------------------------------------------------------- 224 225quiet_cmd_ld = LD $@ 226 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 227 228# Archive 229# --------------------------------------------------------------------------- 230 231quiet_cmd_ar = AR $@ 232 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 233 234# Objcopy 235# --------------------------------------------------------------------------- 236 237quiet_cmd_objcopy = OBJCOPY $@ 238cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 239 240# Gzip 241# --------------------------------------------------------------------------- 242 243quiet_cmd_gzip = GZIP $@ 244 cmd_gzip = cat $(real-prereqs) | gzip -n -f -9 > $@ 245 246# DTC 247# --------------------------------------------------------------------------- 248DTC ?= $(objtree)/scripts/dtc/dtc 249 250# Disable noisy checks by default 251ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) 252DTC_FLAGS += -Wno-unit_address_vs_reg \ 253 -Wno-unit_address_format \ 254 -Wno-avoid_unnecessary_addr_size \ 255 -Wno-alias_paths \ 256 -Wno-graph_child_address \ 257 -Wno-simple_bus_reg \ 258 -Wno-unique_unit_address \ 259 -Wno-pci_device_reg 260endif 261 262ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) 263DTC_FLAGS += -Wnode_name_chars_strict \ 264 -Wproperty_name_chars_strict 265endif 266 267DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 268 269# Generate an assembly file to wrap the output of the device tree compiler 270quiet_cmd_dt_S_dtb= DTB $@ 271cmd_dt_S_dtb= \ 272{ \ 273 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 274 echo '.section .dtb.init.rodata,"a"'; \ 275 echo '.balign STRUCT_ALIGNMENT'; \ 276 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ 277 echo '__dtb_$(subst -,_,$(*F))_begin:'; \ 278 echo '.incbin "$<" '; \ 279 echo '__dtb_$(subst -,_,$(*F))_end:'; \ 280 echo '.global __dtb_$(subst -,_,$(*F))_end'; \ 281 echo '.balign STRUCT_ALIGNMENT'; \ 282} > $@ 283 284$(obj)/%.dtb.S: $(obj)/%.dtb FORCE 285 $(call if_changed,dt_S_dtb) 286 287quiet_cmd_dtc = DTC $@ 288cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 289 $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 290 $(DTC) -O $(2) -o $@ -b 0 \ 291 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 292 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 293 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 294 295$(obj)/%.dtb: $(src)/%.dts $(DTC) FORCE 296 $(call if_changed_dep,dtc,dtb) 297 298DT_CHECKER ?= dt-validate 299DT_BINDING_DIR := Documentation/devicetree/bindings 300DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.yaml 301 302quiet_cmd_dtb_check = CHECK $@ 303 cmd_dtb_check = $(DT_CHECKER) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ ; 304 305define rule_dtc_dt_yaml 306 $(call cmd_and_fixdep,dtc,yaml) 307 $(call cmd,dtb_check) 308endef 309 310$(obj)/%.dt.yaml: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE 311 $(call if_changed_rule,dtc_dt_yaml) 312 313dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 314 315# Bzip2 316# --------------------------------------------------------------------------- 317 318# Bzip2 and LZMA do not include size in file... so we have to fake that; 319# append the size as a 32-bit littleendian number as gzip does. 320size_append = printf $(shell \ 321dec_size=0; \ 322for F in $(real-prereqs); do \ 323 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 324 dec_size=$$(expr $$dec_size + $$fsize); \ 325done; \ 326printf "%08x\n" $$dec_size | \ 327 sed 's/\(..\)/\1 /g' | { \ 328 read ch0 ch1 ch2 ch3; \ 329 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 330 printf '%s%03o' '\\' $$((0x$$ch)); \ 331 done; \ 332 } \ 333) 334 335quiet_cmd_bzip2 = BZIP2 $@ 336 cmd_bzip2 = { cat $(real-prereqs) | bzip2 -9; $(size_append); } > $@ 337 338# Lzma 339# --------------------------------------------------------------------------- 340 341quiet_cmd_lzma = LZMA $@ 342 cmd_lzma = { cat $(real-prereqs) | lzma -9; $(size_append); } > $@ 343 344quiet_cmd_lzo = LZO $@ 345 cmd_lzo = { cat $(real-prereqs) | lzop -9; $(size_append); } > $@ 346 347quiet_cmd_lz4 = LZ4 $@ 348 cmd_lz4 = { cat $(real-prereqs) | lz4c -l -c1 stdin stdout; \ 349 $(size_append); } > $@ 350 351# U-Boot mkimage 352# --------------------------------------------------------------------------- 353 354MKIMAGE := $(srctree)/scripts/mkuboot.sh 355 356# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 357# the number of overrides in arch makefiles 358UIMAGE_ARCH ?= $(SRCARCH) 359UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 360UIMAGE_OPTS-y ?= 361UIMAGE_TYPE ?= kernel 362UIMAGE_LOADADDR ?= arch_must_set_this 363UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 364UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 365 366quiet_cmd_uimage = UIMAGE $@ 367 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 368 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 369 -T $(UIMAGE_TYPE) \ 370 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 371 -n $(UIMAGE_NAME) -d $< $@ 372 373# XZ 374# --------------------------------------------------------------------------- 375# Use xzkern to compress the kernel image and xzmisc to compress other things. 376# 377# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 378# of the kernel decompressor. A BCJ filter is used if it is available for 379# the target architecture. xzkern also appends uncompressed size of the data 380# using size_append. The .xz format has the size information available at 381# the end of the file too, but it's in more complex format and it's good to 382# avoid changing the part of the boot code that reads the uncompressed size. 383# Note that the bytes added by size_append will make the xz tool think that 384# the file is corrupt. This is expected. 385# 386# xzmisc doesn't use size_append, so it can be used to create normal .xz 387# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 388# big dictionary would increase the memory usage too much in the multi-call 389# decompression mode. A BCJ filter isn't used either. 390quiet_cmd_xzkern = XZKERN $@ 391 cmd_xzkern = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 392 $(size_append); } > $@ 393 394quiet_cmd_xzmisc = XZMISC $@ 395 cmd_xzmisc = cat $(real-prereqs) | xz --check=crc32 --lzma2=dict=1MiB > $@ 396 397# ASM offsets 398# --------------------------------------------------------------------------- 399 400# Default sed regexp - multiline due to syntax constraints 401# 402# Use [:space:] because LLVM's integrated assembler inserts <tab> around 403# the .ascii directive whereas GCC keeps the <space> as-is. 404define sed-offsets 405 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 406 /^->/{s:->#\(.*\):/* \1 */:; \ 407 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 408 s:->::; p;}' 409endef 410 411# Use filechk to avoid rebuilds when a header changes, but the resulting file 412# does not 413define filechk_offsets 414 echo "#ifndef $2"; \ 415 echo "#define $2"; \ 416 echo "/*"; \ 417 echo " * DO NOT MODIFY."; \ 418 echo " *"; \ 419 echo " * This file was generated by Kbuild"; \ 420 echo " */"; \ 421 echo ""; \ 422 sed -ne $(sed-offsets) < $<; \ 423 echo ""; \ 424 echo "#endif" 425endef 426