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 = $(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)) 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)y), \ 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 = $(call addtree,-I$(obj)) $(call flags,_c_flags) 159__a_flags = $(call flags,_a_flags) 160__cpp_flags = $(call flags,_cpp_flags) 161endif 162 163c_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 164 $(__c_flags) $(modkern_cflags) \ 165 -D"KBUILD_STR(s)=\#s" $(basename_flags) $(modname_flags) 166 167a_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 168 $(__a_flags) $(modkern_aflags) 169 170cpp_flags = -Wp,-MD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 171 $(__cpp_flags) 172 173ld_flags = $(LDFLAGS) $(ldflags-y) 174 175dtc_cpp_flags = -Wp,-MD,$(depfile).pre.tmp -nostdinc \ 176 -I$(srctree)/arch/$(SRCARCH)/boot/dts \ 177 -I$(srctree)/arch/$(SRCARCH)/boot/dts/include \ 178 -I$(srctree)/drivers/of/testcase-data \ 179 -undef -D__DTS__ 180 181# Finds the multi-part object the current object will be linked into 182modname-multi = $(sort $(foreach m,$(multi-used),\ 183 $(if $(filter $(subst $(obj)/,,$*.o), $($(m:.o=-objs)) $($(m:.o=-y))),$(m:.o=)))) 184 185# Useful for describing the dependency of composite objects 186# Usage: 187# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 188define multi_depend 189$(foreach m, $(notdir $1), \ 190 $(eval $(obj)/$m: \ 191 $(addprefix $(obj)/, $(foreach s, $3, $($(m:%$(strip $2)=%$(s))))))) 192endef 193 194ifdef REGENERATE_PARSERS 195 196# GPERF 197# --------------------------------------------------------------------------- 198quiet_cmd_gperf = GPERF $@ 199 cmd_gperf = gperf -t --output-file $@ -a -C -E -g -k 1,3,$$ -p -t $< 200 201.PRECIOUS: $(src)/%.hash.c_shipped 202$(src)/%.hash.c_shipped: $(src)/%.gperf 203 $(call cmd,gperf) 204 205# LEX 206# --------------------------------------------------------------------------- 207LEX_PREFIX = $(if $(LEX_PREFIX_${baseprereq}),$(LEX_PREFIX_${baseprereq}),yy) 208 209quiet_cmd_flex = LEX $@ 210 cmd_flex = flex -o$@ -L -P $(LEX_PREFIX) $< 211 212.PRECIOUS: $(src)/%.lex.c_shipped 213$(src)/%.lex.c_shipped: $(src)/%.l 214 $(call cmd,flex) 215 216# YACC 217# --------------------------------------------------------------------------- 218YACC_PREFIX = $(if $(YACC_PREFIX_${baseprereq}),$(YACC_PREFIX_${baseprereq}),yy) 219 220quiet_cmd_bison = YACC $@ 221 cmd_bison = bison -o$@ -t -l -p $(YACC_PREFIX) $< 222 223.PRECIOUS: $(src)/%.tab.c_shipped 224$(src)/%.tab.c_shipped: $(src)/%.y 225 $(call cmd,bison) 226 227quiet_cmd_bison_h = YACC $@ 228 cmd_bison_h = bison -o/dev/null --defines=$@ -t -l -p $(YACC_PREFIX) $< 229 230.PRECIOUS: $(src)/%.tab.h_shipped 231$(src)/%.tab.h_shipped: $(src)/%.y 232 $(call cmd,bison_h) 233 234endif 235 236# Shipped files 237# =========================================================================== 238 239quiet_cmd_shipped = SHIPPED $@ 240cmd_shipped = cat $< > $@ 241 242$(obj)/%: $(src)/%_shipped 243 $(call cmd,shipped) 244 245# Commands useful for building a boot image 246# =========================================================================== 247# 248# Use as following: 249# 250# target: source(s) FORCE 251# $(if_changed,ld/objcopy/gzip) 252# 253# and add target to extra-y so that we know we have to 254# read in the saved command line 255 256# Linking 257# --------------------------------------------------------------------------- 258 259quiet_cmd_ld = LD $@ 260cmd_ld = $(LD) $(LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) \ 261 $(filter-out FORCE,$^) -o $@ 262 263# Objcopy 264# --------------------------------------------------------------------------- 265 266quiet_cmd_objcopy = OBJCOPY $@ 267cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 268 269# Gzip 270# --------------------------------------------------------------------------- 271 272quiet_cmd_gzip = GZIP $@ 273cmd_gzip = (cat $(filter-out FORCE,$^) | gzip -n -f -9 > $@) || \ 274 (rm -f $@ ; false) 275 276# DTC 277# --------------------------------------------------------------------------- 278DTC ?= $(objtree)/scripts/dtc/dtc 279 280# Generate an assembly file to wrap the output of the device tree compiler 281quiet_cmd_dt_S_dtb= DTB $@ 282cmd_dt_S_dtb= \ 283( \ 284 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 285 echo '.section .dtb.init.rodata,"a"'; \ 286 echo '.balign STRUCT_ALIGNMENT'; \ 287 echo '.global __dtb_$(*F)_begin'; \ 288 echo '__dtb_$(*F)_begin:'; \ 289 echo '.incbin "$<" '; \ 290 echo '__dtb_$(*F)_end:'; \ 291 echo '.global __dtb_$(*F)_end'; \ 292 echo '.balign STRUCT_ALIGNMENT'; \ 293) > $@ 294 295$(obj)/%.dtb.S: $(obj)/%.dtb 296 $(call cmd,dt_S_dtb) 297 298quiet_cmd_dtc = DTC $@ 299cmd_dtc = mkdir -p $(dir ${dtc-tmp}) ; \ 300 $(CPP) $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 301 $(DTC) -O dtb -o $@ -b 0 \ 302 -i $(dir $<) $(DTC_FLAGS) \ 303 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 304 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 305 306$(obj)/%.dtb: $(src)/%.dts FORCE 307 $(call if_changed_dep,dtc) 308 309dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 310 311# Bzip2 312# --------------------------------------------------------------------------- 313 314# Bzip2 and LZMA do not include size in file... so we have to fake that; 315# append the size as a 32-bit littleendian number as gzip does. 316size_append = printf $(shell \ 317dec_size=0; \ 318for F in $1; do \ 319 fsize=$$(stat -c "%s" $$F); \ 320 dec_size=$$(expr $$dec_size + $$fsize); \ 321done; \ 322printf "%08x\n" $$dec_size | \ 323 sed 's/\(..\)/\1 /g' | { \ 324 read ch0 ch1 ch2 ch3; \ 325 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 326 printf '%s%03o' '\\' $$((0x$$ch)); \ 327 done; \ 328 } \ 329) 330 331quiet_cmd_bzip2 = BZIP2 $@ 332cmd_bzip2 = (cat $(filter-out FORCE,$^) | \ 333 bzip2 -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 334 (rm -f $@ ; false) 335 336# Lzma 337# --------------------------------------------------------------------------- 338 339quiet_cmd_lzma = LZMA $@ 340cmd_lzma = (cat $(filter-out FORCE,$^) | \ 341 lzma -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 342 (rm -f $@ ; false) 343 344quiet_cmd_lzo = LZO $@ 345cmd_lzo = (cat $(filter-out FORCE,$^) | \ 346 lzop -9 && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 347 (rm -f $@ ; false) 348 349quiet_cmd_lz4 = LZ4 $@ 350cmd_lz4 = (cat $(filter-out FORCE,$^) | \ 351 lz4c -l -c1 stdin stdout && $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 352 (rm -f $@ ; false) 353 354# U-Boot mkimage 355# --------------------------------------------------------------------------- 356 357MKIMAGE := $(srctree)/scripts/mkuboot.sh 358 359# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 360# the number of overrides in arch makefiles 361UIMAGE_ARCH ?= $(SRCARCH) 362UIMAGE_COMPRESSION ?= $(if $(2),$(2),none) 363UIMAGE_OPTS-y ?= 364UIMAGE_TYPE ?= kernel 365UIMAGE_LOADADDR ?= arch_must_set_this 366UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 367UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 368UIMAGE_IN ?= $< 369UIMAGE_OUT ?= $@ 370 371quiet_cmd_uimage = UIMAGE $(UIMAGE_OUT) 372 cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 373 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 374 -T $(UIMAGE_TYPE) \ 375 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 376 -n $(UIMAGE_NAME) -d $(UIMAGE_IN) $(UIMAGE_OUT) 377 378# XZ 379# --------------------------------------------------------------------------- 380# Use xzkern to compress the kernel image and xzmisc to compress other things. 381# 382# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 383# of the kernel decompressor. A BCJ filter is used if it is available for 384# the target architecture. xzkern also appends uncompressed size of the data 385# using size_append. The .xz format has the size information available at 386# the end of the file too, but it's in more complex format and it's good to 387# avoid changing the part of the boot code that reads the uncompressed size. 388# Note that the bytes added by size_append will make the xz tool think that 389# the file is corrupt. This is expected. 390# 391# xzmisc doesn't use size_append, so it can be used to create normal .xz 392# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 393# big dictionary would increase the memory usage too much in the multi-call 394# decompression mode. A BCJ filter isn't used either. 395quiet_cmd_xzkern = XZKERN $@ 396cmd_xzkern = (cat $(filter-out FORCE,$^) | \ 397 sh $(srctree)/scripts/xz_wrap.sh && \ 398 $(call size_append, $(filter-out FORCE,$^))) > $@ || \ 399 (rm -f $@ ; false) 400 401quiet_cmd_xzmisc = XZMISC $@ 402cmd_xzmisc = (cat $(filter-out FORCE,$^) | \ 403 xz --check=crc32 --lzma2=dict=1MiB) > $@ || \ 404 (rm -f $@ ; false) 405