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