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_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 177 178dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 179 $(addprefix -I,$(DTC_INCLUDE)) \ 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# 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# --------------------------------------------------------------------------- 270DTC ?= $(objtree)/scripts/dtc/dtc 271 272# Disable noisy checks by default 273ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) 274DTC_FLAGS += -Wno-unit_address_vs_reg \ 275 -Wno-simple_bus_reg \ 276 -Wno-unit_address_format \ 277 -Wno-pci_bridge \ 278 -Wno-pci_device_bus_num \ 279 -Wno-pci_device_reg 280endif 281 282ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2) 283DTC_FLAGS += -Wnode_name_chars_strict \ 284 -Wproperty_name_chars_strict 285endif 286 287DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 288 289# Generate an assembly file to wrap the output of the device tree compiler 290quiet_cmd_dt_S_dtb= DTB $@ 291cmd_dt_S_dtb= \ 292( \ 293 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 294 echo '.section .dtb.init.rodata,"a"'; \ 295 echo '.balign STRUCT_ALIGNMENT'; \ 296 echo '.global __dtb_$(*F)_begin'; \ 297 echo '__dtb_$(*F)_begin:'; \ 298 echo '.incbin "$<" '; \ 299 echo '__dtb_$(*F)_end:'; \ 300 echo '.global __dtb_$(*F)_end'; \ 301 echo '.balign STRUCT_ALIGNMENT'; \ 302) > $@ 303 304$(obj)/%.dtb.S: $(obj)/%.dtb 305 $(call cmd,dt_S_dtb) 306 307quiet_cmd_dtc = DTC $@ 308cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 309 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 310 $(DTC) -O dtb -o $@ -b 0 \ 311 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 312 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 313 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 314 315$(obj)/%.dtb: $(src)/%.dts FORCE 316 $(call if_changed_dep,dtc) 317 318dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 319 320# Bzip2 321# --------------------------------------------------------------------------- 322 323# Bzip2 and LZMA do not include size in file... so we have to fake that; 324# append the size as a 32-bit littleendian number as gzip does. 325size_append = printf $(shell \ 326dec_size=0; \ 327for F in $1; do \ 328 fsize=$$(stat -c "%s" $$F); \ 329 dec_size=$$(expr $$dec_size + $$fsize); \ 330done; \ 331printf "%08x\n" $$dec_size | \ 332 sed 's/\(..\)/\1 /g' | { \ 333 read ch0 ch1 ch2 ch3; \ 334 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 335 printf '%s%03o' '\\' $$((0x$$ch)); \ 336 done; \ 337 } \ 338) 339 340quiet_cmd_bzip2 = BZIP2 $@ 341cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 342 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 343 (rm -f $@ ; false) 344 345# Lzma 346# --------------------------------------------------------------------------- 347 348quiet_cmd_lzma = LZMA $@ 349cmd_lzma = (cat $(filter-out FORCE,$^) | \ 350 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 351 (rm -f $@ ; false) 352 353quiet_cmd_lzo = LZO $@ 354cmd_lzo = (cat $(filter-out FORCE,$^) | \ 355 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 356 (rm -f $@ ; false) 357 358quiet_cmd_lz4 = LZ4 $@ 359cmd_lz4 = (cat $(filter-out FORCE,$^) | \ 360 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 361 (rm -f $@ ; false) 362 363# U-Boot mkimage 364# --------------------------------------------------------------------------- 365 366MKIMAGE := $(srctree)/scripts/mkuboot.sh 367 368# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 369# the number of overrides in arch makefiles 370UIMAGE_ARCH ?= $(SRCARCH) 371UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 372UIMAGE_OPTS-y ?= 373UIMAGE_TYPE ?= kernel 374UIMAGE_LOADADDR ?= arch_must_set_this 375UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 376UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 377UIMAGE_IN ?= $< 378UIMAGE_OUT ?= $@ 379 380quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) 381 cmd_uimage = $(CONFIG_SHELL) $(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 $(UIMAGE_IN) $(UIMAGE_OUT) 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 $@ 405cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 406 sh $(srctree)/scripts/xz_wrap.sh && \ 407 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 408 (rm -f $@ ; false) 409 410quiet_cmd_xzmisc = XZMISC $@ 411cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 412 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 413 (rm -f $@ ; false) 414 415# ASM offsets 416# --------------------------------------------------------------------------- 417 418# Default sed regexp - multiline due to syntax constraints 419# 420# Use [:space:] because LLVM's integrated assembler inserts <tab> around 421# the .ascii directive whereas GCC keeps the <space> as-is. 422define sed-offsets 423 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 424 /^->/{s:->#\(.*\):/* \1 */:; \ 425 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 426 s:->::; p;}' 427endef 428 429# Use filechk to avoid rebuilds when a header changes, but the resulting file 430# does not 431define filechk_offsets 432 (set -e; \ 433 echo "#ifndef $2"; \ 434 echo "#define $2"; \ 435 echo "/*"; \ 436 echo " * DO NOT MODIFY."; \ 437 echo " *"; \ 438 echo " * This file was generated by Kbuild"; \ 439 echo " */"; \ 440 echo ""; \ 441 sed -ne $(sed-offsets); \ 442 echo ""; \ 443 echo "#endif" ) 444endef 445