1# Backward compatibility 2asflags-y += $(EXTRA_AFLAGS) 3ccflags-y += $(EXTRA_CFLAGS) 4cppflags-y += $(EXTRA_CPPFLAGS) 5ldflags-y += $(EXTRA_LDFLAGS) 6 7# 8# flags that take effect in sub directories 9export KBUILD_SUBDIR_ASFLAGS := $(KBUILD_SUBDIR_ASFLAGS) $(subdir-asflags-y) 10export KBUILD_SUBDIR_CCFLAGS := $(KBUILD_SUBDIR_CCFLAGS) $(subdir-ccflags-y) 11 12# Figure out what we need to build from the various variables 13# =========================================================================== 14 15# When an object is listed to be built compiled-in and modular, 16# only build the compiled-in version 17 18obj-m := $(filter-out $(obj-y),$(obj-m)) 19 20# Libraries are always collected in one lib file. 21# Filter out objects already built-in 22 23lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 24 25 26# Handle objects in subdirs 27# --------------------------------------------------------------------------- 28# o if we encounter foo/ in $(obj-y), replace it by foo/built-in.o 29# and add the directory to the list of dirs to descend into: $(subdir-y) 30# o if we encounter foo/ in $(obj-m), remove it from $(obj-m) 31# and add the directory to the list of dirs to descend into: $(subdir-m) 32 33# Determine modorder. 34# Unfortunately, we don't have information about ordering between -y 35# and -m subdirs. Just put -y's first. 36modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko)) 37 38__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y))) 39subdir-y += $(__subdir-y) 40__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m))) 41subdir-m += $(__subdir-m) 42obj-y := $(patsubst %/, %/built-in.o, $(obj-y)) 43obj-m := $(filter-out %/, $(obj-m)) 44 45# Subdirectories we need to descend into 46 47subdir-ym := $(sort $(subdir-y) $(subdir-m)) 48 49# if $(foo-objs) exists, foo.o is a composite object 50multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m)))) 51multi-used-m := $(sort $(foreach m,$(obj-m), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y)) $($(m:.o=-m))), $(m)))) 52multi-used := $(multi-used-y) $(multi-used-m) 53single-used-m := $(sort $(filter-out $(multi-used-m),$(obj-m))) 54 55# Build list of the parts of our composite objects, our composite 56# objects depend on those (obviously) 57multi-objs-y := $(foreach m, $(multi-used-y), $($(m:.o=-objs)) $($(m:.o=-y))) 58multi-objs-m := $(foreach m, $(multi-used-m), $($(m:.o=-objs)) $($(m:.o=-y))) 59multi-objs := $(multi-objs-y) $(multi-objs-m) 60 61# $(subdir-obj-y) is the list of objects in $(obj-y) which uses dir/ to 62# tell kbuild to descend 63subdir-obj-y := $(filter %/built-in.o, $(obj-y)) 64 65# $(obj-dirs) is a list of directories that contain object files 66obj-dirs := $(dir $(multi-objs) $(obj-y)) 67 68# Replace multi-part objects by their individual parts, look at local dir only 69real-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) 70real-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))) 71 72# Add subdir path 73 74extra-y := $(addprefix $(obj)/,$(extra-y)) 75always := $(addprefix $(obj)/,$(always)) 76targets := $(addprefix $(obj)/,$(targets)) 77modorder := $(addprefix $(obj)/,$(modorder)) 78obj-y := $(addprefix $(obj)/,$(obj-y)) 79obj-m := $(addprefix $(obj)/,$(obj-m)) 80lib-y := $(addprefix $(obj)/,$(lib-y)) 81subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) 82real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) 83real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) 84single-used-m := $(addprefix $(obj)/,$(single-used-m)) 85multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) 86multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) 87multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) 88multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) 89subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 90obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) 91 92# These flags are needed for modversions and compiling, so we define them here 93# already 94# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 95# end up in (or would, if it gets compiled in) 96# Note: Files that end up in two or more modules are compiled without the 97# KBUILD_MODNAME definition. The reason is that any made-up name would 98# differ in different configs. 99name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote) 100basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 101modname_flags = $(if $(filter 1,$(words $(modname))),\ 102 -DKBUILD_MODNAME=$(call name-fix,$(modname))) 103 104orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ 105 $(ccflags-y) $(CFLAGS_$(basetarget).o) 106_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) 107orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ 108 $(asflags-y) $(AFLAGS_$(basetarget).o) 109_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags)) 110_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) 111 112# 113# Enable gcov profiling flags for a file, directory or for all files depending 114# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 115# (in this order) 116# 117ifeq ($(CONFIG_GCOV_KERNEL),y) 118_c_flags += $(if $(patsubst n%,, \ 119 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 120 $(CFLAGS_GCOV)) 121endif 122 123# 124# Enable address sanitizer flags for kernel except some files or directories 125# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 126# 127ifeq ($(CONFIG_KASAN),y) 128_c_flags += $(if $(patsubst n%,, \ 129 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 130 $(CFLAGS_KASAN)) 131endif 132 133ifeq ($(CONFIG_UBSAN),y) 134_c_flags += $(if $(patsubst n%,, \ 135 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ 136 $(CFLAGS_UBSAN)) 137endif 138 139ifeq ($(CONFIG_KCOV),y) 140_c_flags += $(if $(patsubst n%,, \ 141 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ 142 $(CFLAGS_KCOV)) 143endif 144 145# If building the kernel in a separate objtree expand all occurrences 146# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). 147 148ifeq ($(KBUILD_SRC),) 149__c_flags = $(_c_flags) 150__a_flags = $(_a_flags) 151__cpp_flags = $(_cpp_flags) 152else 153 154# -I$(obj) locates generated .h files 155# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files 156# and locates generated .h files 157# FIXME: Replace both with specific CFLAGS* statements in the makefiles 158__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \ 159 $(call flags,_c_flags) 160__a_flags = $(call flags,_a_flags) 161__cpp_flags = $(call flags,_cpp_flags) 162endif 163 164c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 165 $(__c_flags) $(modkern_cflags) \ 166 $(basename_flags) $(modname_flags) 167 168a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 169 $(__a_flags) $(modkern_aflags) 170 171cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 172 $(__cpp_flags) 173 174ld_flags = $(LDFLAGS) $(ldflags-y) 175 176dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 177 -I$(srctree)/arch/$(SRCARCH)/boot/dts \ 178 -I$(srctree)/scripts/dtc/include-prefixes \ 179 -I$(srctree)/drivers/of/testcase-data \ 180 -undef -D__DTS__ 181 182# Finds the multi-part object the current object will be linked into 183modname-multi = $(sort $(foreach m,$(multi-used),\ 184 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) 185 186# Useful for describing the dependency of composite objects 187# Usage: 188# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 189define multi_depend 190$(foreach m, $(notdir $1), \ 191 $(eval $(obj)/$m: \ 192 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 193endef 194 195ifdef REGENERATE_PARSERS 196 197# GPERF 198# --------------------------------------------------------------------------- 199quiet_cmd_gperf = GPERF $@ 200 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< 201 202.PRECIOUS: $(src)/%.hash.c_shipped 203$(src)/%.hash.c_shipped: $(src)/%.gperf 204 $(call cmd,gperf) 205 206# LEX 207# --------------------------------------------------------------------------- 208LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) 209 210quiet_cmd_flex = LEX $@ 211 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< 212 213.PRECIOUS: $(src)/%.lex.c_shipped 214$(src)/%.lex.c_shipped: $(src)/%.l 215 $(call cmd,flex) 216 217# YACC 218# --------------------------------------------------------------------------- 219YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) 220 221quiet_cmd_bison = YACC $@ 222 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< 223 224.PRECIOUS: $(src)/%.tab.c_shipped 225$(src)/%.tab.c_shipped: $(src)/%.y 226 $(call cmd,bison) 227 228quiet_cmd_bison_h = YACC $@ 229 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< 230 231.PRECIOUS: $(src)/%.tab.h_shipped 232$(src)/%.tab.h_shipped: $(src)/%.y 233 $(call cmd,bison_h) 234 235endif 236 237# Shipped files 238# =========================================================================== 239 240quiet_cmd_shipped = SHIPPED $@ 241cmd_shipped = cat $< > $@ 242 243$(obj)/%: $(src)/%_shipped 244 $(call cmd,shipped) 245 246# Commands useful for building a boot image 247# =========================================================================== 248# 249# Use as following: 250# 251# target: source(s) FORCE 252# $(if_changed,ld/objcopy/gzip) 253# 254# and add target to extra-y so that we know we have to 255# read in the saved command line 256 257# Linking 258# --------------------------------------------------------------------------- 259 260quiet_cmd_ld = LD $@ 261cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 262 $(filter-out FORCE,$^) -o $@ 263 264# Objcopy 265# --------------------------------------------------------------------------- 266 267quiet_cmd_objcopy = OBJCOPY $@ 268cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 269 270# Gzip 271# --------------------------------------------------------------------------- 272 273quiet_cmd_gzip = GZIP $@ 274cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ 275 (rm -f $@ ; false) 276 277# DTC 278# --------------------------------------------------------------------------- 279DTC ?= $(objtree)/scripts/dtc/dtc 280 281# Disable noisy checks by default 282ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) 283DTC_FLAGS += -Wno-unit_address_vs_reg \ 284 -Wno-simple_bus_reg \ 285 -Wno-unit_address_format \ 286 -Wno-pci_bridge \ 287 -Wno-pci_device_bus_num \ 288 -Wno-pci_device_reg 289endif 290 291ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2) 292DTC_FLAGS += -Wnode_name_chars_strict \ 293 -Wproperty_name_chars_strict 294endif 295 296DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 297 298# Generate an assembly file to wrap the output of the device tree compiler 299quiet_cmd_dt_S_dtb= DTB $@ 300cmd_dt_S_dtb= \ 301( \ 302 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 303 echo '.section .dtb.init.rodata,"a"'; \ 304 echo '.balign STRUCT_ALIGNMENT'; \ 305 echo '.global __dtb_$(*F)_begin'; \ 306 echo '__dtb_$(*F)_begin:'; \ 307 echo '.incbin "$<" '; \ 308 echo '__dtb_$(*F)_end:'; \ 309 echo '.global __dtb_$(*F)_end'; \ 310 echo '.balign STRUCT_ALIGNMENT'; \ 311) > $@ 312 313$(obj)/%.dtb.S: $(obj)/%.dtb 314 $(call cmd,dt_S_dtb) 315 316quiet_cmd_dtc = DTC $@ 317cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 318 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 319 $(DTC) -O dtb -o $@ -b 0 \ 320 -i $(dir $<) $(DTC_FLAGS) \ 321 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 322 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 323 324$(obj)/%.dtb: $(src)/%.dts FORCE 325 $(call if_changed_dep,dtc) 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 $1; do \ 337 fsize=$$(stat -c "%s" $$F); \ 338 dec_size=$$(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 $@ 350cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 351 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 352 (rm -f $@ ; false) 353 354# Lzma 355# --------------------------------------------------------------------------- 356 357quiet_cmd_lzma = LZMA $@ 358cmd_lzma = (cat $(filter-out FORCE,$^) | \ 359 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 360 (rm -f $@ ; false) 361 362quiet_cmd_lzo = LZO $@ 363cmd_lzo = (cat $(filter-out FORCE,$^) | \ 364 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 365 (rm -f $@ ; false) 366 367quiet_cmd_lz4 = LZ4 $@ 368cmd_lz4 = (cat $(filter-out FORCE,$^) | \ 369 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 370 (rm -f $@ ; false) 371 372# U-Boot mkimage 373# --------------------------------------------------------------------------- 374 375MKIMAGE := $(srctree)/scripts/mkuboot.sh 376 377# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 378# the number of overrides in arch makefiles 379UIMAGE_ARCH ?= $(SRCARCH) 380UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 381UIMAGE_OPTS-y ?= 382UIMAGE_TYPE ?= kernel 383UIMAGE_LOADADDR ?= arch_must_set_this 384UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 385UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 386UIMAGE_IN ?= $< 387UIMAGE_OUT ?= $@ 388 389quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) 390 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 391 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 392 -T $(UIMAGE_TYPE) \ 393 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 394 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) 395 396# XZ 397# --------------------------------------------------------------------------- 398# Use xzkern to compress the kernel image and xzmisc to compress other things. 399# 400# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 401# of the kernel decompressor. A BCJ filter is used if it is available for 402# the target architecture. xzkern also appends uncompressed size of the data 403# using size_append. The .xz format has the size information available at 404# the end of the file too, but it's in more complex format and it's good to 405# avoid changing the part of the boot code that reads the uncompressed size. 406# Note that the bytes added by size_append will make the xz tool think that 407# the file is corrupt. This is expected. 408# 409# xzmisc doesn't use size_append, so it can be used to create normal .xz 410# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 411# big dictionary would increase the memory usage too much in the multi-call 412# decompression mode. A BCJ filter isn't used either. 413quiet_cmd_xzkern = XZKERN $@ 414cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 415 sh $(srctree)/scripts/xz_wrap.sh && \ 416 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 417 (rm -f $@ ; false) 418 419quiet_cmd_xzmisc = XZMISC $@ 420cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 421 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 422 (rm -f $@ ; false) 423 424# ASM offsets 425# --------------------------------------------------------------------------- 426 427# Default sed regexp - multiline due to syntax constraints 428# 429# Use [:space:] because LLVM's integrated assembler inserts <tab> around 430# the .ascii directive whereas GCC keeps the <space> as-is. 431define sed-offsets 432 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 433 /^->/{s:->#\(.*\):/* \1 */:; \ 434 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 435 s:->::; p;}' 436endef 437 438# Use filechk to avoid rebuilds when a header changes, but the resulting file 439# does not 440define filechk_offsets 441 (set -e; \ 442 echo "#ifndef $2"; \ 443 echo "#define $2"; \ 444 echo "/*"; \ 445 echo " * DO NOT MODIFY."; \ 446 echo " *"; \ 447 echo " * This file was generated by Kbuild"; \ 448 echo " */"; \ 449 echo ""; \ 450 sed -ne $(sed-offsets); \ 451 echo ""; \ 452 echo "#endif" ) 453endef 454