1# SPDX-License-Identifier: GPL-2.0 2# Backward compatibility 3asflags-y += $(EXTRA_AFLAGS) 4ccflags-y += $(EXTRA_CFLAGS) 5cppflags-y += $(EXTRA_CPPFLAGS) 6ldflags-y += $(EXTRA_LDFLAGS) 7 8# flags that take effect in current and sub directories 9KBUILD_AFLAGS += $(subdir-asflags-y) 10KBUILD_CFLAGS += $(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 17obj-m := $(filter-out $(obj-y),$(obj-m)) 18 19# Libraries are always collected in one lib file. 20# Filter out objects already built-in 21lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 22 23# Subdirectories we need to descend into 24subdir-ym := $(sort $(subdir-y) $(subdir-m) \ 25 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m)))) 26 27# Handle objects in subdirs: 28# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and 29# foo/modules.order 30# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order 31# 32# Generate modules.order to determine modorder. Unfortunately, we don't have 33# information about ordering between -y and -m subdirs. Just put -y's first. 34 35ifdef need-modorder 36obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m)) 37else 38obj-m := $(filter-out %/, $(obj-m)) 39endif 40 41ifdef need-builtin 42obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) 43else 44obj-y := $(filter-out %/, $(obj-y)) 45endif 46 47# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals 48suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s)))) 49# List composite targets that are constructed by combining other targets 50multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m))) 51# List primitive targets that are compiled from source files 52real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m)) 53 54# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object 55multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y) 56multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m) 57multi-obj-ym := $(multi-obj-y) $(multi-obj-m) 58 59# Replace multi-part objects by their individual parts, 60# including built-in.a from subdirectories 61real-obj-y := $(call real-search, $(obj-y), .o, -objs -y) 62real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) 63 64always-y += $(always-m) 65 66# hostprogs-always-y += foo 67# ... is a shorthand for 68# hostprogs += foo 69# always-y += foo 70hostprogs += $(hostprogs-always-y) $(hostprogs-always-m) 71always-y += $(hostprogs-always-y) $(hostprogs-always-m) 72 73# userprogs-always-y is likewise. 74userprogs += $(userprogs-always-y) $(userprogs-always-m) 75always-y += $(userprogs-always-y) $(userprogs-always-m) 76 77# DTB 78# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built 79dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-) 80 81# Composite DTB (i.e. DTB constructed by overlay) 82multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs) 83# Primitive DTB compiled from *.dts 84real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs) 85# Base DTB that overlay is applied onto (each first word of $(*-dtbs) expansion) 86base-dtb-y := $(foreach m, $(multi-dtb-y), $(firstword $(call suffix-search, $m, .dtb, -dtbs))) 87 88always-y += $(dtb-y) 89 90# Add subdir path 91 92ifneq ($(obj),.) 93extra-y := $(addprefix $(obj)/,$(extra-y)) 94always-y := $(addprefix $(obj)/,$(always-y)) 95targets := $(addprefix $(obj)/,$(targets)) 96obj-m := $(addprefix $(obj)/,$(obj-m)) 97lib-y := $(addprefix $(obj)/,$(lib-y)) 98real-obj-y := $(addprefix $(obj)/,$(real-obj-y)) 99real-obj-m := $(addprefix $(obj)/,$(real-obj-m)) 100multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m)) 101multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y)) 102real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y)) 103subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 104endif 105 106# Finds the multi-part object the current object will be linked into. 107# If the object belongs to two or more multi-part objects, list them all. 108modname-multi = $(sort $(foreach m,$(multi-obj-ym),\ 109 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=)))) 110 111__modname = $(or $(modname-multi),$(basetarget)) 112 113modname = $(subst $(space),:,$(__modname)) 114modfile = $(addprefix $(obj)/,$(__modname)) 115 116# target with $(obj)/ and its suffix stripped 117target-stem = $(basename $(patsubst $(obj)/%,%,$@)) 118 119# These flags are needed for modversions and compiling, so we define them here 120# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will 121# end up in (or would, if it gets compiled in) 122name-fix-token = $(subst $(comma),_,$(subst -,_,$1)) 123name-fix = $(call stringify,$(call name-fix-token,$1)) 124basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 125modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \ 126 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname)) 127modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) 128 129_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \ 130 $(filter-out $(ccflags-remove-y), \ 131 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \ 132 $(CFLAGS_$(target-stem).o)) 133_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \ 134 $(filter-out $(asflags-remove-y), \ 135 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \ 136 $(AFLAGS_$(target-stem).o)) 137_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds) 138 139# 140# Enable gcov profiling flags for a file, directory or for all files depending 141# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 142# (in this order) 143# 144ifeq ($(CONFIG_GCOV_KERNEL),y) 145_c_flags += $(if $(patsubst n%,, \ 146 $(GCOV_PROFILE_$(basetarget).o)$(GCOV_PROFILE)$(CONFIG_GCOV_PROFILE_ALL)), \ 147 $(CFLAGS_GCOV)) 148endif 149 150# 151# Enable address sanitizer flags for kernel except some files or directories 152# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 153# 154ifeq ($(CONFIG_KASAN),y) 155ifneq ($(CONFIG_KASAN_HW_TAGS),y) 156_c_flags += $(if $(patsubst n%,, \ 157 $(KASAN_SANITIZE_$(basetarget).o)$(KASAN_SANITIZE)y), \ 158 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 159endif 160endif 161 162ifeq ($(CONFIG_UBSAN),y) 163_c_flags += $(if $(patsubst n%,, \ 164 $(UBSAN_SANITIZE_$(basetarget).o)$(UBSAN_SANITIZE)$(CONFIG_UBSAN_SANITIZE_ALL)), \ 165 $(CFLAGS_UBSAN)) 166endif 167 168ifeq ($(CONFIG_KCOV),y) 169_c_flags += $(if $(patsubst n%,, \ 170 $(KCOV_INSTRUMENT_$(basetarget).o)$(KCOV_INSTRUMENT)$(CONFIG_KCOV_INSTRUMENT_ALL)), \ 171 $(CFLAGS_KCOV)) 172endif 173 174# 175# Enable KCSAN flags except some files or directories we don't want to check 176# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE) 177# 178ifeq ($(CONFIG_KCSAN),y) 179_c_flags += $(if $(patsubst n%,, \ 180 $(KCSAN_SANITIZE_$(basetarget).o)$(KCSAN_SANITIZE)y), \ 181 $(CFLAGS_KCSAN)) 182# Some uninstrumented files provide implied barriers required to avoid false 183# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only. 184_c_flags += $(if $(patsubst n%,, \ 185 $(KCSAN_INSTRUMENT_BARRIERS_$(basetarget).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \ 186 -D__KCSAN_INSTRUMENT_BARRIERS__) 187endif 188 189# $(srctree)/$(src) for including checkin headers from generated source files 190# $(objtree)/$(obj) for including generated headers from checkin source files 191ifeq ($(KBUILD_EXTMOD),) 192ifdef building_out_of_srctree 193_c_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 194_a_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 195_cpp_flags += -I $(srctree)/$(src) -I $(objtree)/$(obj) 196endif 197endif 198 199part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 200quiet_modtag = $(if $(part-of-module),[M], ) 201 202modkern_cflags = \ 203 $(if $(part-of-module), \ 204 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 205 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 206 207modkern_aflags = $(if $(part-of-module), \ 208 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 209 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) 210 211c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 212 -include $(srctree)/include/linux/compiler_types.h \ 213 $(_c_flags) $(modkern_cflags) \ 214 $(basename_flags) $(modname_flags) 215 216a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 217 $(_a_flags) $(modkern_aflags) 218 219cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 220 $(_cpp_flags) 221 222ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 223 224DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 225 226dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \ 227 $(addprefix -I,$(DTC_INCLUDE)) \ 228 -undef -D__DTS__ 229 230ifdef CONFIG_OBJTOOL 231 232objtool := $(objtree)/tools/objtool/objtool 233 234objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label 235objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr 236objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt 237objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount 238objtool-args-$(CONFIG_UNWINDER_ORC) += --orc 239objtool-args-$(CONFIG_RETPOLINE) += --retpoline 240objtool-args-$(CONFIG_RETHUNK) += --rethunk 241objtool-args-$(CONFIG_SLS) += --sls 242objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval 243objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call 244objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess 245objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable 246 247objtool-args = $(objtool-args-y) \ 248 $(if $(delay-objtool), --link) \ 249 $(if $(part-of-module), --module) 250 251delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT)) 252 253cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@) 254cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) 255 256endif # CONFIG_OBJTOOL 257 258# Useful for describing the dependency of composite objects 259# Usage: 260# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 261define multi_depend 262$(foreach m, $1, \ 263 $(eval $m: \ 264 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3)))) 265endef 266 267# Copy a file 268# =========================================================================== 269# 'cp' preserves permissions. If you use it to copy a file in read-only srctree, 270# the copy would be read-only as well, leading to an error when executing the 271# rule next time. Use 'cat' instead in order to generate a writable file. 272quiet_cmd_copy = COPY $@ 273 cmd_copy = cat $< > $@ 274 275$(obj)/%: $(src)/%_shipped 276 $(call cmd,copy) 277 278# Commands useful for building a boot image 279# =========================================================================== 280# 281# Use as following: 282# 283# target: source(s) FORCE 284# $(if_changed,ld/objcopy/gzip) 285# 286# and add target to 'targets' so that we know we have to 287# read in the saved command line 288 289# Linking 290# --------------------------------------------------------------------------- 291 292quiet_cmd_ld = LD $@ 293 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 294 295# Archive 296# --------------------------------------------------------------------------- 297 298quiet_cmd_ar = AR $@ 299 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 300 301# Objcopy 302# --------------------------------------------------------------------------- 303 304quiet_cmd_objcopy = OBJCOPY $@ 305cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 306 307# Gzip 308# --------------------------------------------------------------------------- 309 310quiet_cmd_gzip = GZIP $@ 311 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ 312 313# DTC 314# --------------------------------------------------------------------------- 315DTC ?= $(objtree)/scripts/dtc/dtc 316DTC_FLAGS += -Wno-interrupt_provider 317 318# Disable noisy checks by default 319ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) 320DTC_FLAGS += -Wno-unit_address_vs_reg \ 321 -Wno-avoid_unnecessary_addr_size \ 322 -Wno-alias_paths \ 323 -Wno-graph_child_address \ 324 -Wno-simple_bus_reg \ 325 -Wno-unique_unit_address 326endif 327 328ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) 329DTC_FLAGS += -Wnode_name_chars_strict \ 330 -Wproperty_name_chars_strict \ 331 -Winterrupt_provider 332endif 333 334DTC_FLAGS += $(DTC_FLAGS_$(basetarget)) 335 336# Set -@ if the target is a base DTB that overlay is applied onto 337DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@) 338 339# Generate an assembly file to wrap the output of the device tree compiler 340quiet_cmd_dt_S_dtb= DTB $@ 341cmd_dt_S_dtb= \ 342{ \ 343 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 344 echo '.section .dtb.init.rodata,"a"'; \ 345 echo '.balign STRUCT_ALIGNMENT'; \ 346 echo '.global __dtb_$(subst -,_,$(*F))_begin'; \ 347 echo '__dtb_$(subst -,_,$(*F))_begin:'; \ 348 echo '.incbin "$<" '; \ 349 echo '__dtb_$(subst -,_,$(*F))_end:'; \ 350 echo '.global __dtb_$(subst -,_,$(*F))_end'; \ 351 echo '.balign STRUCT_ALIGNMENT'; \ 352} > $@ 353 354$(obj)/%.dtb.S: $(obj)/%.dtb FORCE 355 $(call if_changed,dt_S_dtb) 356 357quiet_cmd_dtc = DTC $@ 358cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 359 $(DTC) -o $@ -b 0 \ 360 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 361 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 362 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 363 364quiet_cmd_fdtoverlay = DTOVL $@ 365 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(real-prereqs) 366 367$(multi-dtb-y): FORCE 368 $(call if_changed,fdtoverlay) 369$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs) 370 371ifneq ($(CHECK_DTBS)$(CHECK_DT_BINDING),) 372DT_CHECKER ?= dt-validate 373DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m) 374DT_BINDING_DIR := Documentation/devicetree/bindings 375DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json 376 377quiet_cmd_dtb_check = CHECK $@ 378 cmd_dtb_check = $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) $@ || true 379endif 380 381define rule_dtc 382 $(call cmd_and_fixdep,dtc) 383 $(call cmd,dtb_check) 384endef 385 386$(obj)/%.dtb: $(src)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE 387 $(call if_changed_rule,dtc) 388 389$(obj)/%.dtbo: $(src)/%.dts $(DTC) FORCE 390 $(call if_changed_dep,dtc) 391 392dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 393 394# Bzip2 395# --------------------------------------------------------------------------- 396 397# Bzip2 and LZMA do not include size in file... so we have to fake that; 398# append the size as a 32-bit littleendian number as gzip does. 399size_append = printf $(shell \ 400dec_size=0; \ 401for F in $(real-prereqs); do \ 402 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 403 dec_size=$$(expr $$dec_size + $$fsize); \ 404done; \ 405printf "%08x\n" $$dec_size | \ 406 sed 's/\(..\)/\1 /g' | { \ 407 read ch0 ch1 ch2 ch3; \ 408 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 409 printf '%s%03o' '\\' $$((0x$$ch)); \ 410 done; \ 411 } \ 412) 413 414quiet_cmd_file_size = GEN $@ 415 cmd_file_size = $(size_append) > $@ 416 417quiet_cmd_bzip2 = BZIP2 $@ 418 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@ 419 420quiet_cmd_bzip2_with_size = BZIP2 $@ 421 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@ 422 423# Lzma 424# --------------------------------------------------------------------------- 425 426quiet_cmd_lzma = LZMA $@ 427 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@ 428 429quiet_cmd_lzma_with_size = LZMA $@ 430 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 431 432quiet_cmd_lzo = LZO $@ 433 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@ 434 435quiet_cmd_lzo_with_size = LZO $@ 436 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@ 437 438quiet_cmd_lz4 = LZ4 $@ 439 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@ 440 441quiet_cmd_lz4_with_size = LZ4 $@ 442 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \ 443 $(size_append); } > $@ 444 445# U-Boot mkimage 446# --------------------------------------------------------------------------- 447 448MKIMAGE := $(srctree)/scripts/mkuboot.sh 449 450# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 451# the number of overrides in arch makefiles 452UIMAGE_ARCH ?= $(SRCARCH) 453UIMAGE_COMPRESSION ?= $(or $(2),none) 454UIMAGE_OPTS-y ?= 455UIMAGE_TYPE ?= kernel 456UIMAGE_LOADADDR ?= arch_must_set_this 457UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 458UIMAGE_NAME ?= 'Linux-$(KERNELRELEASE)' 459 460quiet_cmd_uimage = UIMAGE $@ 461 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 462 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 463 -T $(UIMAGE_TYPE) \ 464 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 465 -n $(UIMAGE_NAME) -d $< $@ 466 467# XZ 468# --------------------------------------------------------------------------- 469# Use xzkern to compress the kernel image and xzmisc to compress other things. 470# 471# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 472# of the kernel decompressor. A BCJ filter is used if it is available for 473# the target architecture. xzkern also appends uncompressed size of the data 474# using size_append. The .xz format has the size information available at 475# the end of the file too, but it's in more complex format and it's good to 476# avoid changing the part of the boot code that reads the uncompressed size. 477# Note that the bytes added by size_append will make the xz tool think that 478# the file is corrupt. This is expected. 479# 480# xzmisc doesn't use size_append, so it can be used to create normal .xz 481# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 482# big dictionary would increase the memory usage too much in the multi-call 483# decompression mode. A BCJ filter isn't used either. 484quiet_cmd_xzkern = XZKERN $@ 485 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@ 486 487quiet_cmd_xzkern_with_size = XZKERN $@ 488 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 489 $(size_append); } > $@ 490 491quiet_cmd_xzmisc = XZMISC $@ 492 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 493 494# ZSTD 495# --------------------------------------------------------------------------- 496# Appends the uncompressed size of the data using size_append. The .zst 497# format has the size information available at the beginning of the file too, 498# but it's in a more complex format and it's good to avoid changing the part 499# of the boot code that reads the uncompressed size. 500# 501# Note that the bytes added by size_append will make the zstd tool think that 502# the file is corrupt. This is expected. 503# 504# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of 505# 128 MB. zstd22 is used for kernel compression because it is decompressed in a 506# single pass, so zstd doesn't need to allocate a window buffer. When streaming 507# decompression is used, like initramfs decompression, zstd22 should likely not 508# be used because it would require zstd to allocate a 128 MB buffer. 509 510quiet_cmd_zstd = ZSTD $@ 511 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@ 512 513quiet_cmd_zstd22 = ZSTD22 $@ 514 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@ 515 516quiet_cmd_zstd22_with_size = ZSTD22 $@ 517 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@ 518 519# ASM offsets 520# --------------------------------------------------------------------------- 521 522# Default sed regexp - multiline due to syntax constraints 523# 524# Use [:space:] because LLVM's integrated assembler inserts <tab> around 525# the .ascii directive whereas GCC keeps the <space> as-is. 526define sed-offsets 527 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 528 /^->/{s:->#\(.*\):/* \1 */:; \ 529 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 530 s:->::; p;}' 531endef 532 533# Use filechk to avoid rebuilds when a header changes, but the resulting file 534# does not 535define filechk_offsets 536 echo "#ifndef $2"; \ 537 echo "#define $2"; \ 538 echo "/*"; \ 539 echo " * DO NOT MODIFY."; \ 540 echo " *"; \ 541 echo " * This file was generated by Kbuild"; \ 542 echo " */"; \ 543 echo ""; \ 544 sed -ne $(sed-offsets) < $<; \ 545 echo ""; \ 546 echo "#endif" 547endef 548