1# SPDX-License-Identifier: GPL-2.0 2 3# Finds the multi-part object the current object will be linked into. 4# If the object belongs to two or more multi-part objects, list them all. 5modname-multi = $(sort $(foreach m,$(multi-obj-ym),\ 6 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=)))) 7 8__modname = $(or $(modname-multi),$(basetarget)) 9 10modname = $(subst $(space),:,$(__modname)) 11modfile = $(addprefix $(obj)/,$(__modname)) 12 13# target with $(obj)/ and its suffix stripped 14target-stem = $(basename $(patsubst $(obj)/%,%,$@)) 15 16# These flags are needed for modversions and compiling, so we define them here 17# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will 18# end up in (or would, if it gets compiled in) 19name-fix-token = $(subst $(comma),_,$(subst -,_,$1)) 20name-fix = $(call stringify,$(call name-fix-token,$1)) 21basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 22modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \ 23 -D__KBUILD_MODNAME=$(call name-fix-token,$(modname)) 24modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) 25 26_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \ 27 $(filter-out $(ccflags-remove-y), \ 28 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \ 29 $(CFLAGS_$(target-stem).o)) 30_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \ 31 $(filter-out $(rustflags-remove-y), \ 32 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \ 33 $(RUSTFLAGS_$(target-stem).o)) 34_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \ 35 $(filter-out $(asflags-remove-y), \ 36 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \ 37 $(AFLAGS_$(target-stem).o)) 38_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds) 39 40# 41# Enable gcov profiling flags for a file, directory or for all files depending 42# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 43# (in this order) 44# 45ifeq ($(CONFIG_GCOV_KERNEL),y) 46_c_flags += $(if $(patsubst n%,, \ 47 $(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(CONFIG_GCOV_PROFILE_ALL))), \ 48 $(CFLAGS_GCOV)) 49endif 50 51# 52# Enable address sanitizer flags for kernel except some files or directories 53# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 54# 55ifeq ($(CONFIG_KASAN),y) 56ifneq ($(CONFIG_KASAN_HW_TAGS),y) 57_c_flags += $(if $(patsubst n%,, \ 58 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \ 59 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 60_rust_flags += $(if $(patsubst n%,, \ 61 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \ 62 $(RUSTFLAGS_KASAN)) 63endif 64endif 65 66ifeq ($(CONFIG_KMSAN),y) 67_c_flags += $(if $(patsubst n%,, \ 68 $(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \ 69 $(CFLAGS_KMSAN)) 70_c_flags += $(if $(patsubst n%,, \ 71 $(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \ 72 , -mllvm -msan-disable-checks=1) 73endif 74 75ifeq ($(CONFIG_UBSAN),y) 76_c_flags += $(if $(patsubst n%,, \ 77 $(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \ 78 $(CFLAGS_UBSAN)) 79_c_flags += $(if $(patsubst n%,, \ 80 $(UBSAN_INTEGER_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_INTEGER_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \ 81 $(CFLAGS_UBSAN_INTEGER_WRAP)) 82endif 83 84ifeq ($(CONFIG_KCOV),y) 85_c_flags += $(if $(patsubst n%,, \ 86 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \ 87 $(CFLAGS_KCOV)) 88_rust_flags += $(if $(patsubst n%,, \ 89 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \ 90 $(RUSTFLAGS_KCOV)) 91endif 92 93# 94# Enable KCSAN flags except some files or directories we don't want to check 95# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE) 96# 97ifeq ($(CONFIG_KCSAN),y) 98_c_flags += $(if $(patsubst n%,, \ 99 $(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \ 100 $(CFLAGS_KCSAN)) 101# Some uninstrumented files provide implied barriers required to avoid false 102# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only. 103_c_flags += $(if $(patsubst n%,, \ 104 $(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \ 105 -D__KCSAN_INSTRUMENT_BARRIERS__) 106endif 107 108# 109# Enable context analysis flags only where explicitly opted in. 110# (depends on variables CONTEXT_ANALYSIS_obj.o, CONTEXT_ANALYSIS) 111# 112ifeq ($(CONFIG_WARN_CONTEXT_ANALYSIS),y) 113_c_flags += $(if $(patsubst n%,, \ 114 $(CONTEXT_ANALYSIS_$(target-stem).o)$(CONTEXT_ANALYSIS)$(if $(is-kernel-object),$(CONFIG_WARN_CONTEXT_ANALYSIS_ALL))), \ 115 $(CFLAGS_CONTEXT_ANALYSIS)) 116endif 117 118# 119# Enable AutoFDO build flags except some files or directories we don't want to 120# enable (depends on variables AUTOFDO_PROFILE_obj.o and AUTOFDO_PROFILE). 121# 122ifeq ($(CONFIG_AUTOFDO_CLANG),y) 123_c_flags += $(if $(patsubst n%,, \ 124 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \ 125 $(CFLAGS_AUTOFDO_CLANG)) 126_rust_flags += $(if $(patsubst n%,, \ 127 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(is-kernel-object)), \ 128 $(RUSTFLAGS_AUTOFDO_CLANG)) 129endif 130 131# 132# Enable Propeller build flags except some files or directories we don't want to 133# enable (depends on variables AUTOFDO_PROPELLER_obj.o and PROPELLER_PROFILE). 134# 135ifdef CONFIG_PROPELLER_CLANG 136_c_flags += $(if $(patsubst n%,, \ 137 $(AUTOFDO_PROFILE_$(target-stem).o)$(AUTOFDO_PROFILE)$(PROPELLER_PROFILE))$(is-kernel-object), \ 138 $(CFLAGS_PROPELLER_CLANG)) 139endif 140 141# $(src) for including checkin headers from generated source files 142# $(obj) for including generated headers from checkin source files 143ifdef building_out_of_srctree 144_c_flags += $(addprefix -I, $(src) $(obj)) 145_a_flags += $(addprefix -I, $(src) $(obj)) 146_cpp_flags += $(addprefix -I, $(src) $(obj)) 147endif 148 149# If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules 150is-kernel-object = $(or $(part-of-builtin),$(part-of-module)) 151 152part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y) 153part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 154quiet_modtag = $(if $(part-of-module),[M], ) 155 156modkern_cflags = \ 157 $(if $(part-of-module), \ 158 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 159 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 160 161modkern_rustflags = \ 162 $(if $(part-of-module), \ 163 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \ 164 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL)) 165 166modkern_aflags = $(if $(part-of-module), \ 167 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 168 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL) $(modfile_flags)) 169 170c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 171 -include $(srctree)/include/linux/compiler_types.h \ 172 $(_c_flags) $(modkern_cflags) \ 173 $(basename_flags) $(modname_flags) 174 175rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg 176 177a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 178 $(_a_flags) $(modkern_aflags) $(modname_flags) 179 180cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 181 $(_cpp_flags) 182 183ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 184 185ifdef CONFIG_OBJTOOL 186 187objtool := $(objtree)/tools/objtool/objtool 188 189objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label 190objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr 191objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylake 192objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt 193objtool-args-$(CONFIG_CALL_PADDING) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES) 194ifdef CONFIG_CALL_PADDING 195objtool-args-$(CONFIG_CFI) += --cfi 196objtool-args-$(CONFIG_FINEIBT) += --fineibt 197endif 198objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount 199ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 200objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop 201endif 202objtool-args-$(CONFIG_UNWINDER_ORC) += --orc 203objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline 204objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk 205objtool-args-$(CONFIG_MITIGATION_SLS) += --sls 206objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval 207objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call 208objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess 209objtool-args-$(or $(CONFIG_GCOV_KERNEL),$(CONFIG_KCOV)) += --no-unreachable 210objtool-args-$(CONFIG_OBJTOOL_WERROR) += --werror 211 212objtool-args = $(objtool-args-y) \ 213 $(if $(delay-objtool), --link) \ 214 $(if $(part-of-module), --module) 215 216delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT),$(CONFIG_KLP_BUILD)) 217 218cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@) 219cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) 220 221objtool-enabled := y 222 223endif # CONFIG_OBJTOOL 224 225# Useful for describing the dependency of composite objects 226# Usage: 227# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 228define multi_depend 229$(foreach m, $1, \ 230 $(eval $m: \ 231 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3)))) 232endef 233 234# Remove ".." and "." from a path, without using "realpath" 235# Usage: 236# $(call normalize_path,path/to/../file) 237define normalize_path 238$(strip $(eval elements :=) \ 239$(foreach elem,$(subst /, ,$1), \ 240 $(if $(filter-out .,$(elem)), \ 241 $(if $(filter ..,$(elem)), \ 242 $(eval elements := $(wordlist 2,$(words $(elements)),x $(elements))), \ 243 $(eval elements := $(elements) $(elem))))) \ 244$(subst $(space),/,$(elements))) 245endef 246 247# Build commands 248# =========================================================================== 249# These are shared by some Makefile.* files. 250 251ifdef CONFIG_LTO_CLANG 252# Run $(LD) here to convert LLVM IR to ELF in the following cases: 253# - when this object needs objtool processing, as objtool cannot process LLVM IR 254# - when this is a single-object module, as modpost cannot process LLVM IR 255cmd_ld_single = $(if $(objtool-enabled)$(is-single-obj-m), ; $(LD) $(ld_flags) -r -o $(tmp-target) $@; mv $(tmp-target) $@) 256endif 257 258ifdef CONFIG_LTO_CLANG_THIN_DIST 259# Save the _c_flags, sliently. 260quiet_cmd_save_c_flags = 261 saved_c_flags = $(_c_flags) $(modkern_cflags) 262 cmd_save_c_flags = printf '\n%s\n' 'saved_c_flags_$@ := $(call escsq,$(saved_c_flags))' >> $(dot-target).cmd 263endif 264 265quiet_cmd_cc_o_c = CC $(quiet_modtag) $@ 266 cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $< \ 267 $(cmd_ld_single) \ 268 $(cmd_objtool) 269 270define rule_cc_o_c 271 $(call cmd_and_fixdep,cc_o_c) 272 $(call cmd,save_c_flags) 273 $(call cmd,checksrc) 274 $(call cmd,checkdoc) 275 $(call cmd,gen_objtooldep) 276 $(call cmd,gen_symversions_c) 277 $(call cmd,record_mcount) 278 $(call cmd,warn_shared_object) 279endef 280 281quiet_cmd_as_o_S = AS $(quiet_modtag) $@ 282 cmd_as_o_S = $(CC) $(a_flags) -c -o $@ $< $(cmd_objtool) 283 284define rule_as_o_S 285 $(call cmd_and_fixdep,as_o_S) 286 $(call cmd,gen_objtooldep) 287 $(call cmd,gen_symversions_S) 288 $(call cmd,warn_shared_object) 289endef 290 291# Copy a file 292# =========================================================================== 293# 'cp' preserves permissions. If you use it to copy a file in read-only srctree, 294# the copy would be read-only as well, leading to an error when executing the 295# rule next time. Use 'cat' instead in order to generate a writable file. 296quiet_cmd_copy = COPY $@ 297 cmd_copy = cat $< > $@ 298 299$(obj)/%: $(src)/%_shipped 300 $(call cmd,copy) 301 302# Touch a file 303# =========================================================================== 304quiet_cmd_touch = TOUCH $(call normalize_path,$@) 305 cmd_touch = touch $@ 306 307# Commands useful for building a boot image 308# =========================================================================== 309# 310# Use as following: 311# 312# target: source(s) FORCE 313# $(if_changed,ld/objcopy/gzip) 314# 315# and add target to 'targets' so that we know we have to 316# read in the saved command line 317 318# Linking 319# --------------------------------------------------------------------------- 320 321quiet_cmd_ld = LD $@ 322 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 323 324# Archive 325# --------------------------------------------------------------------------- 326 327quiet_cmd_ar = AR $@ 328 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 329 330# Objcopy 331# --------------------------------------------------------------------------- 332 333quiet_cmd_objcopy = OBJCOPY $@ 334cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 335 336# Gzip 337# --------------------------------------------------------------------------- 338 339quiet_cmd_gzip = GZIP $@ 340 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ 341 342# Bzip2 343# --------------------------------------------------------------------------- 344 345# Bzip2 and LZMA do not include size in file... so we have to fake that; 346# append the size as a 32-bit littleendian number as gzip does. 347size_append = printf $(shell \ 348dec_size=0; \ 349for F in $(real-prereqs); do \ 350 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 351 dec_size=$$(expr $$dec_size + $$fsize); \ 352done; \ 353printf "%08x\n" $$dec_size | \ 354 sed 's/\(..\)/\1 /g' | { \ 355 read ch0 ch1 ch2 ch3; \ 356 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 357 printf '%s%03o' '\\' $$((0x$$ch)); \ 358 done; \ 359 } \ 360) 361 362quiet_cmd_file_size = GEN $@ 363 cmd_file_size = $(size_append) > $@ 364 365quiet_cmd_bzip2 = BZIP2 $@ 366 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@ 367 368quiet_cmd_bzip2_with_size = BZIP2 $@ 369 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@ 370 371# Lzma 372# --------------------------------------------------------------------------- 373 374quiet_cmd_lzma = LZMA $@ 375 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@ 376 377quiet_cmd_lzma_with_size = LZMA $@ 378 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 379 380quiet_cmd_lzo = LZO $@ 381 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@ 382 383quiet_cmd_lzo_with_size = LZO $@ 384 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@ 385 386quiet_cmd_lz4 = LZ4 $@ 387 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -9 - - > $@ 388 389quiet_cmd_lz4_with_size = LZ4 $@ 390 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -9 - -; \ 391 $(size_append); } > $@ 392 393# U-Boot mkimage 394# --------------------------------------------------------------------------- 395 396MKIMAGE := $(srctree)/scripts/mkuboot.sh 397 398# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 399# the number of overrides in arch makefiles 400UIMAGE_ARCH ?= $(SRCARCH) 401UIMAGE_COMPRESSION ?= $(or $(2),none) 402UIMAGE_OPTS-y ?= 403UIMAGE_TYPE ?= kernel 404UIMAGE_LOADADDR ?= arch_must_set_this 405UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 406UIMAGE_NAME ?= Linux-$(KERNELRELEASE) 407 408quiet_cmd_uimage = UIMAGE $@ 409 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 410 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 411 -T $(UIMAGE_TYPE) \ 412 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 413 -n '$(UIMAGE_NAME)' -d $< $@ 414 415# Flat Image Tree (FIT) 416# This allows for packaging of a kernel and all devicetrees files, using 417# compression. 418# --------------------------------------------------------------------------- 419 420MAKE_FIT := $(srctree)/scripts/make_fit.py 421 422# Use this to override the compression algorithm 423FIT_COMPRESSION ?= gzip 424 425quiet_cmd_fit = FIT $@ 426 cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \ 427 --name '$(UIMAGE_NAME)' $(FIT_EXTRA_ARGS) \ 428 $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \ 429 $(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \ 430 --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^) 431 432# XZ 433# --------------------------------------------------------------------------- 434# Use xzkern or xzkern_with_size to compress the kernel image and xzmisc to 435# compress other things. 436# 437# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 438# of the kernel decompressor. A BCJ filter is used if it is available for 439# the target architecture. 440# 441# xzkern_with_size also appends uncompressed size of the data using 442# size_append. The .xz format has the size information available at the end 443# of the file too, but it's in more complex format and it's good to avoid 444# changing the part of the boot code that reads the uncompressed size. 445# Note that the bytes added by size_append will make the xz tool think that 446# the file is corrupt. This is expected. 447# 448# xzmisc doesn't use size_append, so it can be used to create normal .xz 449# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 450# big dictionary would increase the memory usage too much in the multi-call 451# decompression mode. A BCJ filter isn't used either. 452quiet_cmd_xzkern = XZKERN $@ 453 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@ 454 455quiet_cmd_xzkern_with_size = XZKERN $@ 456 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 457 $(size_append); } > $@ 458 459quiet_cmd_xzmisc = XZMISC $@ 460 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 461 462# ZSTD 463# --------------------------------------------------------------------------- 464# Appends the uncompressed size of the data using size_append. The .zst 465# format has the size information available at the beginning of the file too, 466# but it's in a more complex format and it's good to avoid changing the part 467# of the boot code that reads the uncompressed size. 468# 469# Note that the bytes added by size_append will make the zstd tool think that 470# the file is corrupt. This is expected. 471# 472# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of 473# 128 MB. zstd22 is used for kernel compression because it is decompressed in a 474# single pass, so zstd doesn't need to allocate a window buffer. When streaming 475# decompression is used, like initramfs decompression, zstd22 should likely not 476# be used because it would require zstd to allocate a 128 MB buffer. 477 478quiet_cmd_zstd = ZSTD $@ 479 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@ 480 481quiet_cmd_zstd22 = ZSTD22 $@ 482 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@ 483 484quiet_cmd_zstd22_with_size = ZSTD22 $@ 485 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@ 486 487# ASM offsets 488# --------------------------------------------------------------------------- 489 490# Default sed regexp - multiline due to syntax constraints 491# 492# Use [:space:] because LLVM's integrated assembler inserts <tab> around 493# the .ascii directive whereas GCC keeps the <space> as-is. 494define sed-offsets 495 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 496 /^->/{s:->#\(.*\):/* \1 */:; \ 497 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 498 s:->::; p;}' 499endef 500 501# Use filechk to avoid rebuilds when a header changes, but the resulting file 502# does not 503define filechk_offsets 504 echo "#ifndef $2"; \ 505 echo "#define $2"; \ 506 echo "/*"; \ 507 echo " * DO NOT MODIFY."; \ 508 echo " *"; \ 509 echo " * This file was generated by Kbuild"; \ 510 echo " */"; \ 511 echo ""; \ 512 sed -ne $(sed-offsets) < $<; \ 513 echo ""; \ 514 echo "#endif" 515endef 516