1# 2# SPDX-License-Identifier: GPL-2.0 3# 4# Backward compatibility 5asflags-y += $(EXTRA_AFLAGS) 6ccflags-y += $(EXTRA_CFLAGS) 7cppflags-y += $(EXTRA_CPPFLAGS) 8ldflags-y += $(EXTRA_LDFLAGS) 9 10# 11# flags that take effect in sub directories 12export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y) 13export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y) 14 15# Figure out what we need to build from the various variables 16# =========================================================================== 17 18# When an object is listed to be built compiled-in and modular, 19# only build the compiled-in version 20 21obj-m := $(filter-out $(obj-y),$(obj-m)) 22 23# Libraries are always collected in one lib file. 24# Filter out objects already built-in 25 26lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 27 28 29# Handle objects in subdirs 30# --------------------------------------------------------------------------- 31# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o 32# and add the directory to the list of dirs to descend into: $(subdir-y) 33# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 34# and add the directory to the list of dirs to descend into: $(subdir-m) 35 36# Determine modorder. 37# Unfortunately, we don't have information about ordering between -y 38# and -m subdirs. Just put -y's first. 39modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) 40 41__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 42subdir-y += $(__subdir-y) 43__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) 44subdir-m += $(__subdir-m) 45obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) 46obj-m := $(filter-out %/, $(obj-m)) 47 48# Subdirectories we need to descend into 49 50subdir-ym := $(sort $(subdir-y) $(subdir-m)) 51 52# if $(foo-objs) exists, foo.o is a composite object 53multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 54multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 55multi-used := $(multi-used-y) $(multi-used-m) 56single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) 57 58# Build list of the parts of our composite objects, our composite 59# objects depend on those (obviously) 60multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) 61multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) 62multi-objs := $(multi-objs-y) $(multi-objs-m) 63 64# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to 65# tell kbuild to descend 66subdir-obj-y := $(filter %/built-in.o, $(obj-y)) 67 68# $(obj-dirs) is a list of directories that contain object files 69obj-dirs := $(dir $(multi-objs) $(obj-y)) 70 71# Replace multi-part objects by their individual parts, look at local dir only 72real-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) 73real-objs-m := $(foreach m, $(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))),$($(m:.o=-objs)) $($(m:.o=-y)),$(m))) 74 75# Add subdir path 76 77extra-y := $(addprefix $(obj)/,$(extra-y)) 78always := $(addprefix $(obj)/,$(always)) 79targets := $(addprefix $(obj)/,$(targets)) 80modorder := $(addprefix $(obj)/,$(modorder)) 81obj-y := $(addprefix $(obj)/,$(obj-y)) 82obj-m := $(addprefix $(obj)/,$(obj-m)) 83lib-y := $(addprefix $(obj)/,$(lib-y)) 84subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) 85real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) 86real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) 87single-used-m := $(addprefix $(obj)/,$(single-used-m)) 88multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) 89multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) 90multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) 91multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) 92subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 93obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) 94 95# These flags are needed for modversions and compiling, so we define them here 96# already 97# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 98# end up in (or would, if it gets compiled in) 99# Note: Files that end up in two or more modules are compiled without the 100# KBUILD_MODNAME definition. The reason is that any made-up name would 101# differ in different configs. 102name-fix = $(subst $(comma),_,$(subst -,_,$1)) 103basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" 104modname_flags = $(if $(filter 1,$(words $(modname))),\ 105 -D"KBUILD_MODNAME=KBUILD_STR($(call name-fix,$(modname)))") 106 107orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ 108 $(ccflags-y) $(CFLAGS_$(basetarget).o) 109_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) 110orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ 111 $(asflags-y) $(AFLAGS_$(basetarget).o) 112_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags)) 113_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) 114 115# 116# Enable gcov profiling flags for a file, directory or for all files depending 117# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 118# (in this order) 119# 120ifeq ($(CONFIG_GCOV_KERNEL),y) 121_c_flags += $(if $(patsubst n%,, \ 122 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 123 $(CFLAGS_GCOV)) 124endif 125 126# 127# Enable address sanitizer flags for kernel except some files or directories 128# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 129# 130ifeq ($(CONFIG_KASAN),y) 131_c_flags += $(if $(patsubst n%,, \ 132 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 133 $(CFLAGS_KASAN)) 134endif 135 136# If building the kernel in a separate objtree expand all occurrences 137# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). 138 139ifeq ($(KBUILD_SRC),) 140__c_flags = $(_c_flags) 141__a_flags = $(_a_flags) 142__cpp_flags = $(_cpp_flags) 143else 144 145# -I$(obj) locates generated .h files 146# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files 147# and locates generated .h files 148# FIXME: Replace both with specific CFLAGS* statements in the makefiles 149__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) 150__a_flags = $(call flags,_a_flags) 151__cpp_flags = $(call flags,_cpp_flags) 152endif 153 154# Modified for U-Boot: LINUXINCLUDE -> UBOOTINCLUDE 155c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \ 156 $(__c_flags) $(modkern_cflags) \ 157 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) 158 159a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \ 160 $(__a_flags) $(modkern_aflags) 161 162cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(UBOOTINCLUDE) \ 163 $(__cpp_flags) 164 165ld_flags = $(LDFLAGS) $(ldflags-y) 166 167# Modified for U-Boot 168dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 169 -I$(srctree)/arch/$(ARCH)/dts \ 170 -I$(srctree)/arch/$(ARCH)/dts/include \ 171 -undef -D__DTS__ 172 173# Finds the multi-part object the current object will be linked into 174modname-multi = $(sort $(foreach m,$(multi-used),\ 175 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) 176 177# Useful for describing the dependency of composite objects 178# Usage: 179# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 180define multi_depend 181$(foreach m, $(notdir $1), \ 182 $(eval $(obj)/$m: \ 183 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 184endef 185 186ifdef REGENERATE_PARSERS 187 188# GPERF 189# --------------------------------------------------------------------------- 190quiet_cmd_gperf = GPERF $@ 191 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< 192 193.PRECIOUS: $(src)/%.hash.c_shipped 194$(src)/%.hash.c_shipped: $(src)/%.gperf 195 $(call cmd,gperf) 196 197# LEX 198# --------------------------------------------------------------------------- 199LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) 200 201quiet_cmd_flex = LEX $@ 202 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< 203 204.PRECIOUS: $(src)/%.lex.c_shipped 205$(src)/%.lex.c_shipped: $(src)/%.l 206 $(call cmd,flex) 207 208# YACC 209# --------------------------------------------------------------------------- 210YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) 211 212quiet_cmd_bison = YACC $@ 213 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< 214 215.PRECIOUS: $(src)/%.tab.c_shipped 216$(src)/%.tab.c_shipped: $(src)/%.y 217 $(call cmd,bison) 218 219quiet_cmd_bison_h = YACC $@ 220 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< 221 222.PRECIOUS: $(src)/%.tab.h_shipped 223$(src)/%.tab.h_shipped: $(src)/%.y 224 $(call cmd,bison_h) 225 226endif 227 228# Shipped files 229# =========================================================================== 230 231quiet_cmd_shipped = SHIPPED $@ 232cmd_shipped = cat $< > $@ 233 234$(obj)/%: $(src)/%_shipped 235 $(call cmd,shipped) 236 237# Commands useful for building a boot image 238# =========================================================================== 239# 240# Use as following: 241# 242# target: source(s) FORCE 243# $(if_changed,ld/objcopy/gzip) 244# 245# and add target to extra-y so that we know we have to 246# read in the saved command line 247 248# Linking 249# --------------------------------------------------------------------------- 250 251quiet_cmd_ld = LD $@ 252cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 253 $(filter-out FORCE,$^) -o $@ 254 255# Objcopy 256# --------------------------------------------------------------------------- 257 258quiet_cmd_objcopy = OBJCOPY $@ 259cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 260 261# Gzip 262# --------------------------------------------------------------------------- 263 264quiet_cmd_gzip = GZIP $@ 265cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ 266 (rm -f $@ ; false) 267 268# DTC 269# --------------------------------------------------------------------------- 270 271# Generate an assembly file to wrap the output of the device tree compiler 272quiet_cmd_dt_S_dtb= DTB $@ 273# Modified for U-Boot 274cmd_dt_S_dtb= \ 275( \ 276 echo '.section .dtb.init.rodata,"a"'; \ 277 echo '.balign 16'; \ 278 echo '.global __dtb_$(*F)_begin'; \ 279 echo '__dtb_$(*F)_begin:'; \ 280 echo '.incbin "$<" '; \ 281 echo '__dtb_$(*F)_end:'; \ 282 echo '.global __dtb_$(*F)_end'; \ 283 echo '.balign 16'; \ 284) > $@ 285 286$(obj)/%.dtb.S: $(obj)/%.dtb 287 $(call cmd,dt_S_dtb) 288 289quiet_cmd_dtc = DTC $@ 290# Modified for U-Boot 291cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 292 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 293 $(DTC) -O dtb -o $@ -b 0 \ 294 -i $(dir $<) $(DTC_FLAGS) \ 295 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 296 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 297 298$(obj)/%.dtb: $(src)/%.dts FORCE 299 $(call if_changed_dep,dtc) 300 301dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 302 303# ACPI 304# --------------------------------------------------------------------------- 305quiet_cmd_acpi_c_asl= ASL $@ 306cmd_acpi_c_asl= \ 307 $(CPP) -x assembler-with-cpp -P -o $<.tmp $<; \ 308 iasl -p $< -tc -va $<.tmp; \ 309 mv $(patsubst %.asl,%.hex,$<) $@ 310 311$(obj)/%.c: $(src)/%.asl 312 $(call cmd,acpi_c_asl) 313 314# Bzip2 315# --------------------------------------------------------------------------- 316 317# Bzip2 and LZMA do not include size in file... so we have to fake that; 318# append the size as a 32-bit littleendian number as gzip does. 319size_append = printf $(shell \ 320dec_size=0; \ 321for F in $1; do \ 322 fsize=$$(stat -c "%s" $$F); \ 323 dec_size=$$(expr $$dec_size + $$fsize); \ 324done; \ 325printf "%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 } \ 332) 333 334quiet_cmd_bzip2 = BZIP2 $@ 335cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 336 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 337 (rm -f $@ ; false) 338 339# Lzma 340# --------------------------------------------------------------------------- 341 342quiet_cmd_lzma = LZMA $@ 343cmd_lzma = (cat $(filter-out FORCE,$^) | \ 344 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 345 (rm -f $@ ; false) 346 347quiet_cmd_lzo = LZO $@ 348cmd_lzo = (cat $(filter-out FORCE,$^) | \ 349 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 350 (rm -f $@ ; false) 351 352quiet_cmd_lz4 = LZ4 $@ 353cmd_lz4 = (cat $(filter-out FORCE,$^) | \ 354 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 355 (rm -f $@ ; false) 356 357# U-Boot mkimage 358# --------------------------------------------------------------------------- 359 360MKIMAGE := $(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 364UIMAGE_ARCH ?= $(SRCARCH) 365UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 366UIMAGE_OPTS-y ?= 367UIMAGE_TYPE ?= kernel 368UIMAGE_LOADADDR ?= arch_must_set_this 369UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 370UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 371UIMAGE_IN ?= $< 372UIMAGE_OUT ?= $@ 373 374quiet_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) 380 381# 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. 398quiet_cmd_xzkern = XZKERN $@ 399cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 400 sh $(srctree)/scripts/xz_wrap.sh && \ 401 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 402 (rm -f $@ ; false) 403 404quiet_cmd_xzmisc = XZMISC $@ 405cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 406 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 407 (rm -f $@ ; false) 408 409# Additional commands for U-Boot 410# 411# mkimage 412# --------------------------------------------------------------------------- 413quiet_cmd_mkimage = MKIMAGE $@ 414cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \ 415 $(if $(KBUILD_VERBOSE:1=), >/dev/null) 416