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)))) 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=-objs)) $($(m:.o=-y)),$(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 = $(subst $(comma),_,$(subst -,_,$1)) 100basename_flags = -D"KBUILD_BASENAME=KBUILD_STR($(call name-fix,$(basetarget)))" 101modname_flags = $(if $(filter 1,$(words $(modname))),\ 102 -D"KBUILD_MODNAME=KBUILD_STR($(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)) 107_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ 108 $(asflags-y) $(AFLAGS_$(basetarget).o) 109_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) 110 111# 112# Enable gcov profiling flags for a file, directory or for all files depending 113# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 114# (in this order) 115# 116ifeq ($(CONFIG_GCOV_KERNEL),y) 117_c_flags += $(if $(patsubst n%,, \ 118 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 119 $(CFLAGS_GCOV)) 120endif 121 122# 123# Enable address sanitizer flags for kernel except some files or directories 124# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 125# 126ifeq ($(CONFIG_KASAN),y) 127_c_flags += $(if $(patsubst n%,, \ 128 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 129 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 130endif 131 132ifeq ($(CONFIG_KCOV),y) 133_c_flags += $(if $(patsubst n%,, \ 134 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)y), \ 135 $(CFLAGS_KCOV)) 136endif 137 138# If building the kernel in a separate objtree expand all occurrences 139# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). 140 141ifeq ($(KBUILD_SRC),) 142__c_flags = $(_c_flags) 143__a_flags = $(_a_flags) 144__cpp_flags = $(_cpp_flags) 145else 146 147# -I$(obj) locates generated .h files 148# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files 149# and locates generated .h files 150# FIXME: Replace both with specific CFLAGS* statements in the makefiles 151__c_flags = $(call addtree,-I$(obj)) $(call flags,_c_flags) 152__a_flags = $(call flags,_a_flags) 153__cpp_flags = $(call flags,_cpp_flags) 154endif 155 156c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 157 $(__c_flags) $(modkern_cflags) \ 158 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) 159 160a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 161 $(__a_flags) $(modkern_aflags) 162 163cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 164 $(__cpp_flags) 165 166ld_flags = $(LDFLAGS) $(ldflags-y) 167 168dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 169 -I$(srctree)/arch/$(SRCARCH)/boot/dts \ 170 -I$(srctree)/scripts/dtc/include-prefixes \ 171 -I$(srctree)/drivers/of/testcase-data \ 172 -undef -D__DTS__ 173 174# Finds the multi-part object the current object will be linked into 175modname-multi = $(sort $(foreach m,$(multi-used),\ 176 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) 177 178# Useful for describing the dependency of composite objects 179# Usage: 180# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 181define multi_depend 182$(foreach m, $(notdir $1), \ 183 $(eval $(obj)/$m: \ 184 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 185endef 186 187ifdef REGENERATE_PARSERS 188 189# GPERF 190# --------------------------------------------------------------------------- 191quiet_cmd_gperf = GPERF $@ 192 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< 193 194.PRECIOUS: $(src)/%.hash.c_shipped 195$(src)/%.hash.c_shipped: $(src)/%.gperf 196 $(call cmd,gperf) 197 198# LEX 199# --------------------------------------------------------------------------- 200LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) 201 202quiet_cmd_flex = LEX $@ 203 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< 204 205.PRECIOUS: $(src)/%.lex.c_shipped 206$(src)/%.lex.c_shipped: $(src)/%.l 207 $(call cmd,flex) 208 209# YACC 210# --------------------------------------------------------------------------- 211YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) 212 213quiet_cmd_bison = YACC $@ 214 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< 215 216.PRECIOUS: $(src)/%.tab.c_shipped 217$(src)/%.tab.c_shipped: $(src)/%.y 218 $(call cmd,bison) 219 220quiet_cmd_bison_h = YACC $@ 221 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< 222 223.PRECIOUS: $(src)/%.tab.h_shipped 224$(src)/%.tab.h_shipped: $(src)/%.y 225 $(call cmd,bison_h) 226 227endif 228 229# Shipped files 230# =========================================================================== 231 232quiet_cmd_shipped = SHIPPED $@ 233cmd_shipped = cat $< > $@ 234 235$(obj)/%: $(src)/%_shipped 236 $(call cmd,shipped) 237 238# Commands useful for building a boot image 239# =========================================================================== 240# 241# Use as following: 242# 243# target: source(s) FORCE 244# $(if_changed,ld/objcopy/gzip) 245# 246# and add target to extra-y so that we know we have to 247# read in the saved command line 248 249# Linking 250# --------------------------------------------------------------------------- 251 252quiet_cmd_ld = LD $@ 253cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 254 $(filter-out FORCE,$^) -o $@ 255 256# Objcopy 257# --------------------------------------------------------------------------- 258 259quiet_cmd_objcopy = OBJCOPY $@ 260cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 261 262# Gzip 263# --------------------------------------------------------------------------- 264 265quiet_cmd_gzip = GZIP $@ 266cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ 267 (rm -f $@ ; false) 268 269# DTC 270# --------------------------------------------------------------------------- 271DTC ?= $(objtree)/scripts/dtc/dtc 272 273# Generation of symbols for Android 274ifeq ($(CONFIG_ANDROID),y) 275DTC_FLAGS += -@ 276endif 277 278# Disable noisy checks by default 279ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) 280DTC_FLAGS += -Wno-unit_address_vs_reg \ 281 -Wno-simple_bus_reg \ 282 -Wno-unit_address_format \ 283 -Wno-pci_bridge \ 284 -Wno-pci_device_bus_num \ 285 -Wno-pci_device_reg 286endif 287 288ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2) 289DTC_FLAGS += -Wnode_name_chars_strict \ 290 -Wproperty_name_chars_strict 291endif 292 293# Generate an assembly file to wrap the output of the device tree compiler 294quiet_cmd_dt_S_dtb= DTB $@ 295cmd_dt_S_dtb= \ 296( \ 297 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 298 echo '.section .dtb.init.rodata,"a"'; \ 299 echo '.balign STRUCT_ALIGNMENT'; \ 300 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ 301 echo '__dtb_$(subst -,_,$(*F))_begin:'; \ 302 echo '.incbin "$<" '; \ 303 echo '__dtb_$(subst -,_,$(*F))_end:'; \ 304 echo '.global __dtb_$(subst -,_,$(*F))_end'; \ 305 echo '.balign STRUCT_ALIGNMENT'; \ 306) > $@ 307 308$(obj)/%.dtb.S: $(obj)/%.dtb 309 $(call cmd,dt_S_dtb) 310 311quiet_cmd_dtc = DTC $@ 312cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 313 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 314 $(DTC) -O dtb -o $@ -b 0 \ 315 -i $(dir $<) $(DTC_FLAGS) \ 316 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 317 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 318 319$(obj)/%.dtb: $(src)/%.dts FORCE 320 $(call if_changed_dep,dtc) 321 322dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 323 324# cat 325# --------------------------------------------------------------------------- 326# Concatentate multiple files together 327quiet_cmd_cat = CAT $@ 328cmd_cat = (cat $(filter-out FORCE,$^) > $@) || (rm -f $@; false) 329 330# Bzip2 331# --------------------------------------------------------------------------- 332 333# Bzip2 and LZMA do not include size in file... so we have to fake that; 334# append the size as a 32-bit littleendian number as gzip does. 335size_append = printf $(shell \ 336dec_size=0; \ 337for F in $1; do \ 338 fsize=$$(stat -c "%s" $$F); \ 339 dec_size=$$(expr $$dec_size + $$fsize); \ 340done; \ 341printf "%08x\n" $$dec_size | \ 342 sed 's/\(..\)/\1 /g' | { \ 343 read ch0 ch1 ch2 ch3; \ 344 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 345 printf '%s%03o' '\\' $$((0x$$ch)); \ 346 done; \ 347 } \ 348) 349 350quiet_cmd_bzip2 = BZIP2 $@ 351cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 352 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 353 (rm -f $@ ; false) 354 355# Lzma 356# --------------------------------------------------------------------------- 357 358quiet_cmd_lzma = LZMA $@ 359cmd_lzma = (cat $(filter-out FORCE,$^) | \ 360 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 361 (rm -f $@ ; false) 362 363quiet_cmd_lzo = LZO $@ 364cmd_lzo = (cat $(filter-out FORCE,$^) | \ 365 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 366 (rm -f $@ ; false) 367 368quiet_cmd_lz4 = LZ4 $@ 369cmd_lz4 = (cat $(filter-out FORCE,$^) | \ 370 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 371 (rm -f $@ ; false) 372 373quiet_cmd_lz4c = LZ4C $@ 374cmd_lz4c = (cat $(filter-out FORCE,$^) | \ 375 lz4c -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 376 (rm -f $@ ; false) 377 378# U-Boot mkimage 379# --------------------------------------------------------------------------- 380 381MKIMAGE := $(srctree)/scripts/mkuboot.sh 382 383# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 384# the number of overrides in arch makefiles 385UIMAGE_ARCH ?= $(SRCARCH) 386UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 387UIMAGE_OPTS-y ?= 388UIMAGE_TYPE ?= kernel 389UIMAGE_LOADADDR ?= arch_must_set_this 390UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 391UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 392UIMAGE_IN ?= $< 393UIMAGE_OUT ?= $@ 394 395quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) 396 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 397 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 398 -T $(UIMAGE_TYPE) \ 399 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 400 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) 401 402# XZ 403# --------------------------------------------------------------------------- 404# Use xzkern to compress the kernel image and xzmisc to compress other things. 405# 406# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 407# of the kernel decompressor. A BCJ filter is used if it is available for 408# the target architecture. xzkern also appends uncompressed size of the data 409# using size_append. The .xz format has the size information available at 410# the end of the file too, but it's in more complex format and it's good to 411# avoid changing the part of the boot code that reads the uncompressed size. 412# Note that the bytes added by size_append will make the xz tool think that 413# the file is corrupt. This is expected. 414# 415# xzmisc doesn't use size_append, so it can be used to create normal .xz 416# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 417# big dictionary would increase the memory usage too much in the multi-call 418# decompression mode. A BCJ filter isn't used either. 419quiet_cmd_xzkern = XZKERN $@ 420cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 421 sh $(srctree)/scripts/xz_wrap.sh && \ 422 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 423 (rm -f $@ ; false) 424 425quiet_cmd_xzmisc = XZMISC $@ 426cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 427 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 428 (rm -f $@ ; false) 429 430# ASM offsets 431# --------------------------------------------------------------------------- 432 433# Default sed regexp - multiline due to syntax constraints 434# 435# Use [:space:] because LLVM's integrated assembler inserts <tab> around 436# the .ascii directive whereas GCC keeps the <space> as-is. 437define sed-offsets 438 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 439 /^->/{s:->#\(.*\):/* \1 */:; \ 440 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 441 s:->::; p;}' 442endef 443 444# Use filechk to avoid rebuilds when a header changes, but the resulting file 445# does not 446define filechk_offsets 447 (set -e; \ 448 echo "#ifndef $2"; \ 449 echo "#define $2"; \ 450 echo "/*"; \ 451 echo " * DO NOT MODIFY."; \ 452 echo " *"; \ 453 echo " * This file was generated by Kbuild"; \ 454 echo " */"; \ 455 echo ""; \ 456 sed -ne $(sed-offsets); \ 457 echo ""; \ 458 echo "#endif" ) 459endef 460