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# DTB 73# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built 74extra-y += $(dtb-y) 75extra-$(CONFIG_OF_ALL_DTBS) += $(dtb-) 76 77# Add subdir path 78 79extra-y := $(addprefix $(obj)/,$(extra-y)) 80always := $(addprefix $(obj)/,$(always)) 81targets := $(addprefix $(obj)/,$(targets)) 82modorder := $(addprefix $(obj)/,$(modorder)) 83obj-y := $(addprefix $(obj)/,$(obj-y)) 84obj-m := $(addprefix $(obj)/,$(obj-m)) 85lib-y := $(addprefix $(obj)/,$(lib-y)) 86subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y)) 87real-objs-y := $(addprefix $(obj)/,$(real-objs-y)) 88real-objs-m := $(addprefix $(obj)/,$(real-objs-m)) 89single-used-m := $(addprefix $(obj)/,$(single-used-m)) 90multi-used-y := $(addprefix $(obj)/,$(multi-used-y)) 91multi-used-m := $(addprefix $(obj)/,$(multi-used-m)) 92multi-objs-y := $(addprefix $(obj)/,$(multi-objs-y)) 93multi-objs-m := $(addprefix $(obj)/,$(multi-objs-m)) 94subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 95obj-dirs := $(addprefix $(obj)/,$(obj-dirs)) 96 97# These flags are needed for modversions and compiling, so we define them here 98# already 99# $(modname_flags) #defines KBUILD_MODNAME as the name of the module it will 100# end up in (or would, if it gets compiled in) 101# Note: Files that end up in two or more modules are compiled without the 102# KBUILD_MODNAME definition. The reason is that any made-up name would 103# differ in different configs. 104name-fix = $(squote)$(quote)$(subst $(comma),_,$(subst -,_,$1))$(quote)$(squote) 105basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 106modname_flags = $(if $(filter 1,$(words $(modname))),\ 107 -DKBUILD_MODNAME=$(call name-fix,$(modname))) 108 109orig_c_flags = $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(KBUILD_SUBDIR_CCFLAGS) \ 110 $(ccflags-y) $(CFLAGS_$(basetarget).o) 111_c_flags = $(filter-out $(CFLAGS_REMOVE_$(basetarget).o), $(orig_c_flags)) 112orig_a_flags = $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(KBUILD_SUBDIR_ASFLAGS) \ 113 $(asflags-y) $(AFLAGS_$(basetarget).o) 114_a_flags = $(filter-out $(AFLAGS_REMOVE_$(basetarget).o), $(orig_a_flags)) 115_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(@F)) 116 117# 118# Enable gcov profiling flags for a file, directory or for all files depending 119# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 120# (in this order) 121# 122ifeq ($(CONFIG_GCOV_KERNEL),y) 123_c_flags += $(if $(patsubst n%,, \ 124 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 125 $(CFLAGS_GCOV)) 126endif 127 128# 129# Enable address sanitizer flags for kernel except some files or directories 130# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 131# 132ifeq ($(CONFIG_KASAN),y) 133_c_flags += $(if $(patsubst n%,, \ 134 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 135 $(CFLAGS_KASAN)) 136endif 137 138ifeq ($(CONFIG_UBSAN),y) 139_c_flags += $(if $(patsubst n%,, \ 140 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ 141 $(CFLAGS_UBSAN)) 142endif 143 144ifeq ($(CONFIG_KCOV),y) 145_c_flags += $(if $(patsubst n%,, \ 146 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ 147 $(CFLAGS_KCOV)) 148endif 149 150# If building the kernel in a separate objtree expand all occurrences 151# of -Idir to -I$(srctree)/dir except for absolute paths (starting with '/'). 152 153ifeq ($(KBUILD_SRC),) 154__c_flags = $(_c_flags) 155__a_flags = $(_a_flags) 156__cpp_flags = $(_cpp_flags) 157else 158 159# -I$(obj) locates generated .h files 160# $(call addtree,-I$(obj)) locates .h files in srctree, from generated .c files 161# and locates generated .h files 162# FIXME: Replace both with specific CFLAGS* statements in the makefiles 163__c_flags = $(if $(obj),$(call addtree,-I$(src)) -I$(obj)) \ 164 $(call flags,_c_flags) 165__a_flags = $(call flags,_a_flags) 166__cpp_flags = $(call flags,_cpp_flags) 167endif 168 169c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 170 $(__c_flags) $(modkern_cflags) \ 171 $(basename_flags) $(modname_flags) 172 173a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 174 $(__a_flags) $(modkern_aflags) 175 176cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 177 $(__cpp_flags) 178 179ld_flags = $(LDFLAGS) $(ldflags-y) 180 181DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 182 183dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 184 $(addprefix -I,$(DTC_INCLUDE)) \ 185 -undef -D__DTS__ 186 187# Finds the multi-part object the current object will be linked into 188modname-multi = $(sort $(foreach m,$(multi-used),\ 189 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) 190 191# Useful for describing the dependency of composite objects 192# Usage: 193# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 194define multi_depend 195$(foreach m, $(notdir $1), \ 196 $(eval $(obj)/$m: \ 197 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 198endef 199 200ifdef REGENERATE_PARSERS 201 202# LEX 203# --------------------------------------------------------------------------- 204LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) 205 206quiet_cmd_flex = LEX $@ 207 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< 208 209.PRECIOUS: $(src)/%.lex.c_shipped 210$(src)/%.lex.c_shipped: $(src)/%.l 211 $(call cmd,flex) 212 213# YACC 214# --------------------------------------------------------------------------- 215YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) 216 217quiet_cmd_bison = YACC $@ 218 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< 219 220.PRECIOUS: $(src)/%.tab.c_shipped 221$(src)/%.tab.c_shipped: $(src)/%.y 222 $(call cmd,bison) 223 224quiet_cmd_bison_h = YACC $@ 225 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< 226 227.PRECIOUS: $(src)/%.tab.h_shipped 228$(src)/%.tab.h_shipped: $(src)/%.y 229 $(call cmd,bison_h) 230 231endif 232 233# Shipped files 234# =========================================================================== 235 236quiet_cmd_shipped = SHIPPED $@ 237cmd_shipped = cat $< > $@ 238 239$(obj)/%: $(src)/%_shipped 240 $(call cmd,shipped) 241 242# Commands useful for building a boot image 243# =========================================================================== 244# 245# Use as following: 246# 247# target: source(s) FORCE 248# $(if_changed,ld/objcopy/gzip) 249# 250# and add target to extra-y so that we know we have to 251# read in the saved command line 252 253# Linking 254# --------------------------------------------------------------------------- 255 256quiet_cmd_ld = LD $@ 257cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 258 $(filter-out FORCE,$^) -o $@ 259 260# Objcopy 261# --------------------------------------------------------------------------- 262 263quiet_cmd_objcopy = OBJCOPY $@ 264cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 265 266# Gzip 267# --------------------------------------------------------------------------- 268 269quiet_cmd_gzip = GZIP $@ 270cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ 271 (rm -f $@ ; false) 272 273# DTC 274# --------------------------------------------------------------------------- 275DTC ?= $(objtree)/scripts/dtc/dtc 276 277# Disable noisy checks by default 278ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),) 279DTC_FLAGS += -Wno-unit_address_vs_reg \ 280 -Wno-simple_bus_reg \ 281 -Wno-unit_address_format \ 282 -Wno-pci_bridge \ 283 -Wno-pci_device_bus_num \ 284 -Wno-pci_device_reg 285endif 286 287ifeq ($(KBUILD_ENABLE_EXTRA_GCC_CHECKS),2) 288DTC_FLAGS += -Wnode_name_chars_strict \ 289 -Wproperty_name_chars_strict 290endif 291 292DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 293 294# Generate an assembly file to wrap the output of the device tree compiler 295quiet_cmd_dt_S_dtb= DTB $@ 296cmd_dt_S_dtb= \ 297( \ 298 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 299 echo '.section .dtb.init.rodata,"a"'; \ 300 echo '.balign STRUCT_ALIGNMENT'; \ 301 echo '.global __dtb_$(*F)_begin'; \ 302 echo '__dtb_$(*F)_begin:'; \ 303 echo '.incbin "$<" '; \ 304 echo '__dtb_$(*F)_end:'; \ 305 echo '.global __dtb_$(*F)_end'; \ 306 echo '.balign STRUCT_ALIGNMENT'; \ 307) > $@ 308 309$(obj)/%.dtb.S: $(obj)/%.dtb 310 $(call cmd,dt_S_dtb) 311 312quiet_cmd_dtc = DTC $@ 313cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 314 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 315 $(DTC) -O dtb -o $@ -b 0 \ 316 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 317 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 318 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 319 320$(obj)/%.dtb: $(src)/%.dts FORCE 321 $(call if_changed_dep,dtc) 322 323dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 324 325# Bzip2 326# --------------------------------------------------------------------------- 327 328# Bzip2 and LZMA do not include size in file... so we have to fake that; 329# append the size as a 32-bit littleendian number as gzip does. 330size_append = printf $(shell \ 331dec_size=0; \ 332for F in $1; do \ 333 fsize=$$(stat -c "%s" $$F); \ 334 dec_size=$$(expr $$dec_size + $$fsize); \ 335done; \ 336printf "%08x\n" $$dec_size | \ 337 sed 's/\(..\)/\1 /g' | { \ 338 read ch0 ch1 ch2 ch3; \ 339 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 340 printf '%s%03o' '\\' $$((0x$$ch)); \ 341 done; \ 342 } \ 343) 344 345quiet_cmd_bzip2 = BZIP2 $@ 346cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 347 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 348 (rm -f $@ ; false) 349 350# Lzma 351# --------------------------------------------------------------------------- 352 353quiet_cmd_lzma = LZMA $@ 354cmd_lzma = (cat $(filter-out FORCE,$^) | \ 355 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 356 (rm -f $@ ; false) 357 358quiet_cmd_lzo = LZO $@ 359cmd_lzo = (cat $(filter-out FORCE,$^) | \ 360 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 361 (rm -f $@ ; false) 362 363quiet_cmd_lz4 = LZ4 $@ 364cmd_lz4 = (cat $(filter-out FORCE,$^) | \ 365 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 366 (rm -f $@ ; false) 367 368# U-Boot mkimage 369# --------------------------------------------------------------------------- 370 371MKIMAGE := $(srctree)/scripts/mkuboot.sh 372 373# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 374# the number of overrides in arch makefiles 375UIMAGE_ARCH ?= $(SRCARCH) 376UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 377UIMAGE_OPTS-y ?= 378UIMAGE_TYPE ?= kernel 379UIMAGE_LOADADDR ?= arch_must_set_this 380UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 381UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 382UIMAGE_IN ?= $< 383UIMAGE_OUT ?= $@ 384 385quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) 386 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 387 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 388 -T $(UIMAGE_TYPE) \ 389 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 390 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) 391 392# XZ 393# --------------------------------------------------------------------------- 394# Use xzkern to compress the kernel image and xzmisc to compress other things. 395# 396# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 397# of the kernel decompressor. A BCJ filter is used if it is available for 398# the target architecture. xzkern also appends uncompressed size of the data 399# using size_append. The .xz format has the size information available at 400# the end of the file too, but it's in more complex format and it's good to 401# avoid changing the part of the boot code that reads the uncompressed size. 402# Note that the bytes added by size_append will make the xz tool think that 403# the file is corrupt. This is expected. 404# 405# xzmisc doesn't use size_append, so it can be used to create normal .xz 406# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 407# big dictionary would increase the memory usage too much in the multi-call 408# decompression mode. A BCJ filter isn't used either. 409quiet_cmd_xzkern = XZKERN $@ 410cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 411 sh $(srctree)/scripts/xz_wrap.sh && \ 412 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 413 (rm -f $@ ; false) 414 415quiet_cmd_xzmisc = XZMISC $@ 416cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 417 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 418 (rm -f $@ ; false) 419 420# ASM offsets 421# --------------------------------------------------------------------------- 422 423# Default sed regexp - multiline due to syntax constraints 424# 425# Use [:space:] because LLVM's integrated assembler inserts <tab> around 426# the .ascii directive whereas GCC keeps the <space> as-is. 427define sed-offsets 428 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 429 /^->/{s:->#\(.*\):/* \1 */:; \ 430 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 431 s:->::; p;}' 432endef 433 434# Use filechk to avoid rebuilds when a header changes, but the resulting file 435# does not 436define filechk_offsets 437 (set -e; \ 438 echo "#ifndef $2"; \ 439 echo "#define $2"; \ 440 echo "/*"; \ 441 echo " * DO NOT MODIFY."; \ 442 echo " *"; \ 443 echo " * This file was generated by Kbuild"; \ 444 echo " */"; \ 445 echo ""; \ 446 sed -ne $(sed-offsets); \ 447 echo ""; \ 448 echo "#endif" ) 449endef 450