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) 11KBUILD_RUSTFLAGS += $(subdir-rustflags-y) 12 13# Figure out what we need to build from the various variables 14# =========================================================================== 15 16# When an object is listed to be built compiled-in and modular, 17# only build the compiled-in version 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 22lib-y := $(filter-out $(obj-y), $(sort $(lib-y) $(lib-m))) 23 24# Subdirectories we need to descend into 25subdir-ym := $(sort $(subdir-y) $(subdir-m) \ 26 $(patsubst %/,%, $(filter %/, $(obj-y) $(obj-m)))) 27 28# Handle objects in subdirs: 29# - If we encounter foo/ in $(obj-y), replace it by foo/built-in.a and 30# foo/modules.order 31# - If we encounter foo/ in $(obj-m), replace it by foo/modules.order 32# 33# Generate modules.order to determine modorder. Unfortunately, we don't have 34# information about ordering between -y and -m subdirs. Just put -y's first. 35 36ifdef need-modorder 37obj-m := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m)) 38else 39obj-m := $(filter-out %/, $(obj-m)) 40endif 41 42ifdef need-builtin 43obj-y := $(patsubst %/, %/built-in.a, $(obj-y)) 44else 45obj-y := $(filter-out %/, $(obj-y)) 46endif 47 48ifdef need-dtbslist 49dtb-y += $(addsuffix /dtbs-list, $(subdir-ym)) 50always-y += dtbs-list 51endif 52 53# Expand $(foo-objs) $(foo-y) etc. by replacing their individuals 54suffix-search = $(strip $(foreach s, $3, $($(1:%$(strip $2)=%$s)))) 55# List composite targets that are constructed by combining other targets 56multi-search = $(sort $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $m))) 57# List primitive targets that are compiled from source files 58real-search = $(foreach m, $1, $(if $(call suffix-search, $m, $2, $3 -), $(call suffix-search, $m, $2, $3), $m)) 59 60# If $(foo-objs), $(foo-y), $(foo-m), or $(foo-) exists, foo.o is a composite object 61multi-obj-y := $(call multi-search, $(obj-y), .o, -objs -y) 62multi-obj-m := $(call multi-search, $(obj-m), .o, -objs -y -m) 63multi-obj-ym := $(multi-obj-y) $(multi-obj-m) 64 65# Replace multi-part objects by their individual parts, 66# including built-in.a from subdirectories 67real-obj-y := $(call real-search, $(obj-y), .o, -objs -y) 68real-obj-m := $(call real-search, $(obj-m), .o, -objs -y -m) 69 70always-y += $(always-m) 71 72# hostprogs-always-y += foo 73# ... is a shorthand for 74# hostprogs += foo 75# always-y += foo 76hostprogs += $(hostprogs-always-y) $(hostprogs-always-m) 77always-y += $(hostprogs-always-y) $(hostprogs-always-m) 78 79# userprogs-always-y is likewise. 80userprogs += $(userprogs-always-y) $(userprogs-always-m) 81always-y += $(userprogs-always-y) $(userprogs-always-m) 82 83# DTB 84# If CONFIG_OF_ALL_DTBS is enabled, all DT blobs are built 85dtb-$(CONFIG_OF_ALL_DTBS) += $(dtb-) 86 87# Composite DTB (i.e. DTB constructed by overlay) 88multi-dtb-y := $(call multi-search, $(dtb-y), .dtb, -dtbs) 89# Primitive DTB compiled from *.dts 90real-dtb-y := $(call real-search, $(dtb-y), .dtb, -dtbs) 91# Base DTB that overlay is applied onto 92base-dtb-y := $(filter %.dtb, $(call real-search, $(multi-dtb-y), .dtb, -dtbs)) 93 94always-y += $(dtb-y) 95 96# Add subdir path 97 98ifneq ($(obj),.) 99extra-y := $(addprefix $(obj)/,$(extra-y)) 100always-y := $(addprefix $(obj)/,$(always-y)) 101targets := $(addprefix $(obj)/,$(targets)) 102obj-m := $(addprefix $(obj)/,$(obj-m)) 103lib-y := $(addprefix $(obj)/,$(lib-y)) 104real-obj-y := $(addprefix $(obj)/,$(real-obj-y)) 105real-obj-m := $(addprefix $(obj)/,$(real-obj-m)) 106multi-obj-m := $(addprefix $(obj)/, $(multi-obj-m)) 107dtb-y := $(addprefix $(obj)/, $(dtb-y)) 108multi-dtb-y := $(addprefix $(obj)/, $(multi-dtb-y)) 109real-dtb-y := $(addprefix $(obj)/, $(real-dtb-y)) 110subdir-ym := $(addprefix $(obj)/,$(subdir-ym)) 111endif 112 113# Finds the multi-part object the current object will be linked into. 114# If the object belongs to two or more multi-part objects, list them all. 115modname-multi = $(sort $(foreach m,$(multi-obj-ym),\ 116 $(if $(filter $*.o, $(call suffix-search, $m, .o, -objs -y -m)),$(m:.o=)))) 117 118__modname = $(or $(modname-multi),$(basetarget)) 119 120modname = $(subst $(space),:,$(__modname)) 121modfile = $(addprefix $(obj)/,$(__modname)) 122 123# target with $(obj)/ and its suffix stripped 124target-stem = $(basename $(patsubst $(obj)/%,%,$@)) 125 126# These flags are needed for modversions and compiling, so we define them here 127# $(modname_flags) defines KBUILD_MODNAME as the name of the module it will 128# end up in (or would, if it gets compiled in) 129name-fix-token = $(subst $(comma),_,$(subst -,_,$1)) 130name-fix = $(call stringify,$(call name-fix-token,$1)) 131basename_flags = -DKBUILD_BASENAME=$(call name-fix,$(basetarget)) 132modname_flags = -DKBUILD_MODNAME=$(call name-fix,$(modname)) \ 133 -D__KBUILD_MODNAME=kmod_$(call name-fix-token,$(modname)) 134modfile_flags = -DKBUILD_MODFILE=$(call stringify,$(modfile)) 135 136_c_flags = $(filter-out $(CFLAGS_REMOVE_$(target-stem).o), \ 137 $(filter-out $(ccflags-remove-y), \ 138 $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(ccflags-y)) \ 139 $(CFLAGS_$(target-stem).o)) 140_rust_flags = $(filter-out $(RUSTFLAGS_REMOVE_$(target-stem).o), \ 141 $(filter-out $(rustflags-remove-y), \ 142 $(KBUILD_RUSTFLAGS) $(rustflags-y)) \ 143 $(RUSTFLAGS_$(target-stem).o)) 144_a_flags = $(filter-out $(AFLAGS_REMOVE_$(target-stem).o), \ 145 $(filter-out $(asflags-remove-y), \ 146 $(KBUILD_CPPFLAGS) $(KBUILD_AFLAGS) $(asflags-y)) \ 147 $(AFLAGS_$(target-stem).o)) 148_cpp_flags = $(KBUILD_CPPFLAGS) $(cppflags-y) $(CPPFLAGS_$(target-stem).lds) 149 150# 151# Enable gcov profiling flags for a file, directory or for all files depending 152# on variables GCOV_PROFILE_obj.o, GCOV_PROFILE and CONFIG_GCOV_PROFILE_ALL 153# (in this order) 154# 155ifeq ($(CONFIG_GCOV_KERNEL),y) 156_c_flags += $(if $(patsubst n%,, \ 157 $(GCOV_PROFILE_$(target-stem).o)$(GCOV_PROFILE)$(if $(is-kernel-object),$(CONFIG_GCOV_PROFILE_ALL))), \ 158 $(CFLAGS_GCOV)) 159endif 160 161# 162# Enable address sanitizer flags for kernel except some files or directories 163# we don't want to check (depends on variables KASAN_SANITIZE_obj.o, KASAN_SANITIZE) 164# 165ifeq ($(CONFIG_KASAN),y) 166ifneq ($(CONFIG_KASAN_HW_TAGS),y) 167_c_flags += $(if $(patsubst n%,, \ 168 $(KASAN_SANITIZE_$(target-stem).o)$(KASAN_SANITIZE)$(is-kernel-object)), \ 169 $(CFLAGS_KASAN), $(CFLAGS_KASAN_NOSANITIZE)) 170endif 171endif 172 173ifeq ($(CONFIG_KMSAN),y) 174_c_flags += $(if $(patsubst n%,, \ 175 $(KMSAN_SANITIZE_$(target-stem).o)$(KMSAN_SANITIZE)$(is-kernel-object)), \ 176 $(CFLAGS_KMSAN)) 177_c_flags += $(if $(patsubst n%,, \ 178 $(KMSAN_ENABLE_CHECKS_$(target-stem).o)$(KMSAN_ENABLE_CHECKS)$(is-kernel-object)), \ 179 , -mllvm -msan-disable-checks=1) 180endif 181 182ifeq ($(CONFIG_UBSAN),y) 183_c_flags += $(if $(patsubst n%,, \ 184 $(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SANITIZE)$(is-kernel-object)), \ 185 $(CFLAGS_UBSAN)) 186_c_flags += $(if $(patsubst n%,, \ 187 $(UBSAN_SIGNED_WRAP_$(target-stem).o)$(UBSAN_SANITIZE_$(target-stem).o)$(UBSAN_SIGNED_WRAP)$(UBSAN_SANITIZE)$(is-kernel-object)), \ 188 $(CFLAGS_UBSAN_SIGNED_WRAP)) 189endif 190 191ifeq ($(CONFIG_KCOV),y) 192_c_flags += $(if $(patsubst n%,, \ 193 $(KCOV_INSTRUMENT_$(target-stem).o)$(KCOV_INSTRUMENT)$(if $(is-kernel-object),$(CONFIG_KCOV_INSTRUMENT_ALL))), \ 194 $(CFLAGS_KCOV)) 195endif 196 197# 198# Enable KCSAN flags except some files or directories we don't want to check 199# (depends on variables KCSAN_SANITIZE_obj.o, KCSAN_SANITIZE) 200# 201ifeq ($(CONFIG_KCSAN),y) 202_c_flags += $(if $(patsubst n%,, \ 203 $(KCSAN_SANITIZE_$(target-stem).o)$(KCSAN_SANITIZE)$(is-kernel-object)), \ 204 $(CFLAGS_KCSAN)) 205# Some uninstrumented files provide implied barriers required to avoid false 206# positives: set KCSAN_INSTRUMENT_BARRIERS for barrier instrumentation only. 207_c_flags += $(if $(patsubst n%,, \ 208 $(KCSAN_INSTRUMENT_BARRIERS_$(target-stem).o)$(KCSAN_INSTRUMENT_BARRIERS)n), \ 209 -D__KCSAN_INSTRUMENT_BARRIERS__) 210endif 211 212# $(src) for including checkin headers from generated source files 213# $(obj) for including generated headers from checkin source files 214ifeq ($(KBUILD_EXTMOD),) 215ifdef building_out_of_srctree 216_c_flags += $(addprefix -I, $(src) $(obj)) 217_a_flags += $(addprefix -I, $(src) $(obj)) 218_cpp_flags += $(addprefix -I, $(src) $(obj)) 219endif 220endif 221 222# If $(is-kernel-object) is 'y', this object will be linked to vmlinux or modules 223is-kernel-object = $(or $(part-of-builtin),$(part-of-module)) 224 225part-of-builtin = $(if $(filter $(basename $@).o, $(real-obj-y) $(lib-y)),y) 226part-of-module = $(if $(filter $(basename $@).o, $(real-obj-m)),y) 227quiet_modtag = $(if $(part-of-module),[M], ) 228 229modkern_cflags = \ 230 $(if $(part-of-module), \ 231 $(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \ 232 $(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL) $(modfile_flags)) 233 234modkern_rustflags = \ 235 $(if $(part-of-module), \ 236 $(KBUILD_RUSTFLAGS_MODULE) $(RUSTFLAGS_MODULE), \ 237 $(KBUILD_RUSTFLAGS_KERNEL) $(RUSTFLAGS_KERNEL)) 238 239modkern_aflags = $(if $(part-of-module), \ 240 $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE), \ 241 $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)) 242 243c_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 244 -include $(srctree)/include/linux/compiler_types.h \ 245 $(_c_flags) $(modkern_cflags) \ 246 $(basename_flags) $(modname_flags) 247 248rust_flags = $(_rust_flags) $(modkern_rustflags) @$(objtree)/include/generated/rustc_cfg 249 250a_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 251 $(_a_flags) $(modkern_aflags) 252 253cpp_flags = -Wp,-MMD,$(depfile) $(NOSTDINC_FLAGS) $(LINUXINCLUDE) \ 254 $(_cpp_flags) 255 256ld_flags = $(KBUILD_LDFLAGS) $(ldflags-y) $(LDFLAGS_$(@F)) 257 258DTC_INCLUDE := $(srctree)/scripts/dtc/include-prefixes 259 260dtc_cpp_flags = -Wp,-MMD,$(depfile).pre.tmp -nostdinc \ 261 $(addprefix -I,$(DTC_INCLUDE)) \ 262 -undef -D__DTS__ 263 264ifdef CONFIG_OBJTOOL 265 266objtool := $(objtree)/tools/objtool/objtool 267 268objtool-args-$(CONFIG_HAVE_JUMP_LABEL_HACK) += --hacks=jump_label 269objtool-args-$(CONFIG_HAVE_NOINSTR_HACK) += --hacks=noinstr 270objtool-args-$(CONFIG_MITIGATION_CALL_DEPTH_TRACKING) += --hacks=skylake 271objtool-args-$(CONFIG_X86_KERNEL_IBT) += --ibt 272objtool-args-$(CONFIG_FINEIBT) += --cfi 273objtool-args-$(CONFIG_FTRACE_MCOUNT_USE_OBJTOOL) += --mcount 274ifdef CONFIG_FTRACE_MCOUNT_USE_OBJTOOL 275objtool-args-$(CONFIG_HAVE_OBJTOOL_NOP_MCOUNT) += --mnop 276endif 277objtool-args-$(CONFIG_UNWINDER_ORC) += --orc 278objtool-args-$(CONFIG_MITIGATION_RETPOLINE) += --retpoline 279objtool-args-$(CONFIG_MITIGATION_RETHUNK) += --rethunk 280objtool-args-$(CONFIG_MITIGATION_SLS) += --sls 281objtool-args-$(CONFIG_STACK_VALIDATION) += --stackval 282objtool-args-$(CONFIG_HAVE_STATIC_CALL_INLINE) += --static-call 283objtool-args-$(CONFIG_HAVE_UACCESS_VALIDATION) += --uaccess 284objtool-args-$(CONFIG_GCOV_KERNEL) += --no-unreachable 285objtool-args-$(CONFIG_PREFIX_SYMBOLS) += --prefix=$(CONFIG_FUNCTION_PADDING_BYTES) 286 287objtool-args = $(objtool-args-y) \ 288 $(if $(delay-objtool), --link) \ 289 $(if $(part-of-module), --module) 290 291delay-objtool := $(or $(CONFIG_LTO_CLANG),$(CONFIG_X86_KERNEL_IBT)) 292 293cmd_objtool = $(if $(objtool-enabled), ; $(objtool) $(objtool-args) $@) 294cmd_gen_objtooldep = $(if $(objtool-enabled), { echo ; echo '$@: $$(wildcard $(objtool))' ; } >> $(dot-target).cmd) 295 296endif # CONFIG_OBJTOOL 297 298# Useful for describing the dependency of composite objects 299# Usage: 300# $(call multi_depend, multi_used_targets, suffix_to_remove, suffix_to_add) 301define multi_depend 302$(foreach m, $1, \ 303 $(eval $m: \ 304 $(addprefix $(obj)/, $(call suffix-search, $(patsubst $(obj)/%,%,$m), $2, $3)))) 305endef 306 307# Copy a file 308# =========================================================================== 309# 'cp' preserves permissions. If you use it to copy a file in read-only srctree, 310# the copy would be read-only as well, leading to an error when executing the 311# rule next time. Use 'cat' instead in order to generate a writable file. 312quiet_cmd_copy = COPY $@ 313 cmd_copy = cat $< > $@ 314 315$(obj)/%: $(src)/%_shipped 316 $(call cmd,copy) 317 318# Commands useful for building a boot image 319# =========================================================================== 320# 321# Use as following: 322# 323# target: source(s) FORCE 324# $(if_changed,ld/objcopy/gzip) 325# 326# and add target to 'targets' so that we know we have to 327# read in the saved command line 328 329# Linking 330# --------------------------------------------------------------------------- 331 332quiet_cmd_ld = LD $@ 333 cmd_ld = $(LD) $(ld_flags) $(real-prereqs) -o $@ 334 335# Archive 336# --------------------------------------------------------------------------- 337 338quiet_cmd_ar = AR $@ 339 cmd_ar = rm -f $@; $(AR) cDPrsT $@ $(real-prereqs) 340 341# Objcopy 342# --------------------------------------------------------------------------- 343 344quiet_cmd_objcopy = OBJCOPY $@ 345cmd_objcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@ 346 347# Gzip 348# --------------------------------------------------------------------------- 349 350quiet_cmd_gzip = GZIP $@ 351 cmd_gzip = cat $(real-prereqs) | $(KGZIP) -n -f -9 > $@ 352 353# DTC 354# --------------------------------------------------------------------------- 355DTC ?= $(objtree)/scripts/dtc/dtc 356DTC_FLAGS += \ 357 -Wno-unique_unit_address 358 359# Disable noisy checks by default 360ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),) 361DTC_FLAGS += -Wno-unit_address_vs_reg \ 362 -Wno-avoid_unnecessary_addr_size \ 363 -Wno-alias_paths \ 364 -Wno-graph_child_address \ 365 -Wno-simple_bus_reg 366else 367DTC_FLAGS += \ 368 -Wunique_unit_address_if_enabled 369endif 370 371ifneq ($(findstring 2,$(KBUILD_EXTRA_WARN)),) 372DTC_FLAGS += -Wnode_name_chars_strict \ 373 -Wproperty_name_chars_strict \ 374 -Wunique_unit_address 375endif 376 377DTC_FLAGS += $(DTC_FLAGS_$(target-stem)) 378 379# Set -@ if the target is a base DTB that overlay is applied onto 380DTC_FLAGS += $(if $(filter $(patsubst $(obj)/%,%,$@), $(base-dtb-y)), -@) 381 382# Generate an assembly file to wrap the output of the device tree compiler 383quiet_cmd_wrap_S_dtb = WRAP $@ 384 cmd_wrap_S_dtb = { \ 385 symbase=__$(patsubst .%,%,$(suffix $<))_$(subst -,_,$(notdir $*)); \ 386 echo '\#include <asm-generic/vmlinux.lds.h>'; \ 387 echo '.section .dtb.init.rodata,"a"'; \ 388 echo '.balign STRUCT_ALIGNMENT'; \ 389 echo ".global $${symbase}_begin"; \ 390 echo "$${symbase}_begin:"; \ 391 echo '.incbin "$<" '; \ 392 echo ".global $${symbase}_end"; \ 393 echo "$${symbase}_end:"; \ 394 echo '.balign STRUCT_ALIGNMENT'; \ 395 } > $@ 396 397$(obj)/%.dtb.S: $(obj)/%.dtb FORCE 398 $(call if_changed,wrap_S_dtb) 399 400$(obj)/%.dtbo.S: $(obj)/%.dtbo FORCE 401 $(call if_changed,wrap_S_dtb) 402 403quiet_cmd_dtc = DTC $@ 404cmd_dtc = $(HOSTCC) -E $(dtc_cpp_flags) -x assembler-with-cpp -o $(dtc-tmp) $< ; \ 405 $(DTC) -o $@ -b 0 \ 406 $(addprefix -i,$(dir $<) $(DTC_INCLUDE)) $(DTC_FLAGS) \ 407 -d $(depfile).dtc.tmp $(dtc-tmp) ; \ 408 cat $(depfile).pre.tmp $(depfile).dtc.tmp > $(depfile) 409 410DT_CHECK_CMD = $(DT_CHECKER) $(DT_CHECKER_FLAGS) -u $(srctree)/$(DT_BINDING_DIR) -p $(DT_TMP_SCHEMA) 411 412# NOTE: 413# Do not replace $(filter %.dtb %.dtbo, $^) with $(real-prereqs). When a single 414# DTB is turned into a multi-blob DTB, $^ will contain header file dependencies 415# recorded in the .*.cmd file. 416ifneq ($(CHECK_DTBS),) 417quiet_cmd_fdtoverlay = DTOVLCH $@ 418 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(filter %.dtb %.dtbo, $^) ; $(DT_CHECK_CMD) $@ || true 419else 420quiet_cmd_fdtoverlay = DTOVL $@ 421 cmd_fdtoverlay = $(objtree)/scripts/dtc/fdtoverlay -o $@ -i $(filter %.dtb %.dtbo, $^) 422endif 423 424$(multi-dtb-y): FORCE 425 $(call if_changed,fdtoverlay) 426$(call multi_depend, $(multi-dtb-y), .dtb, -dtbs) 427 428ifneq ($(CHECK_DTBS),) 429DT_CHECKER ?= dt-validate 430DT_CHECKER_FLAGS ?= $(if $(DT_SCHEMA_FILES),-l $(DT_SCHEMA_FILES),-m) 431DT_BINDING_DIR := Documentation/devicetree/bindings 432DT_TMP_SCHEMA := $(objtree)/$(DT_BINDING_DIR)/processed-schema.json 433 434quiet_cmd_dtb = DTC_CHK $@ 435 cmd_dtb = $(cmd_dtc) ; $(DT_CHECK_CMD) $@ || true 436else 437quiet_cmd_dtb = $(quiet_cmd_dtc) 438 cmd_dtb = $(cmd_dtc) 439endif 440 441$(obj)/%.dtb: $(obj)/%.dts $(DTC) $(DT_TMP_SCHEMA) FORCE 442 $(call if_changed_dep,dtb) 443 444$(obj)/%.dtbo: $(src)/%.dtso $(DTC) FORCE 445 $(call if_changed_dep,dtc) 446 447dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp) 448 449# Bzip2 450# --------------------------------------------------------------------------- 451 452# Bzip2 and LZMA do not include size in file... so we have to fake that; 453# append the size as a 32-bit littleendian number as gzip does. 454size_append = printf $(shell \ 455dec_size=0; \ 456for F in $(real-prereqs); do \ 457 fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \ 458 dec_size=$$(expr $$dec_size + $$fsize); \ 459done; \ 460printf "%08x\n" $$dec_size | \ 461 sed 's/\(..\)/\1 /g' | { \ 462 read ch0 ch1 ch2 ch3; \ 463 for ch in $$ch3 $$ch2 $$ch1 $$ch0; do \ 464 printf '%s%03o' '\\' $$((0x$$ch)); \ 465 done; \ 466 } \ 467) 468 469quiet_cmd_file_size = GEN $@ 470 cmd_file_size = $(size_append) > $@ 471 472quiet_cmd_bzip2 = BZIP2 $@ 473 cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@ 474 475quiet_cmd_bzip2_with_size = BZIP2 $@ 476 cmd_bzip2_with_size = { cat $(real-prereqs) | $(KBZIP2) -9; $(size_append); } > $@ 477 478# Lzma 479# --------------------------------------------------------------------------- 480 481quiet_cmd_lzma = LZMA $@ 482 cmd_lzma = cat $(real-prereqs) | $(LZMA) -9 > $@ 483 484quiet_cmd_lzma_with_size = LZMA $@ 485 cmd_lzma_with_size = { cat $(real-prereqs) | $(LZMA) -9; $(size_append); } > $@ 486 487quiet_cmd_lzo = LZO $@ 488 cmd_lzo = cat $(real-prereqs) | $(KLZOP) -9 > $@ 489 490quiet_cmd_lzo_with_size = LZO $@ 491 cmd_lzo_with_size = { cat $(real-prereqs) | $(KLZOP) -9; $(size_append); } > $@ 492 493quiet_cmd_lz4 = LZ4 $@ 494 cmd_lz4 = cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout > $@ 495 496quiet_cmd_lz4_with_size = LZ4 $@ 497 cmd_lz4_with_size = { cat $(real-prereqs) | $(LZ4) -l -c1 stdin stdout; \ 498 $(size_append); } > $@ 499 500# U-Boot mkimage 501# --------------------------------------------------------------------------- 502 503MKIMAGE := $(srctree)/scripts/mkuboot.sh 504 505# SRCARCH just happens to match slightly more than ARCH (on sparc), so reduces 506# the number of overrides in arch makefiles 507UIMAGE_ARCH ?= $(SRCARCH) 508UIMAGE_COMPRESSION ?= $(or $(2),none) 509UIMAGE_OPTS-y ?= 510UIMAGE_TYPE ?= kernel 511UIMAGE_LOADADDR ?= arch_must_set_this 512UIMAGE_ENTRYADDR ?= $(UIMAGE_LOADADDR) 513UIMAGE_NAME ?= Linux-$(KERNELRELEASE) 514 515quiet_cmd_uimage = UIMAGE $@ 516 cmd_uimage = $(BASH) $(MKIMAGE) -A $(UIMAGE_ARCH) -O linux \ 517 -C $(UIMAGE_COMPRESSION) $(UIMAGE_OPTS-y) \ 518 -T $(UIMAGE_TYPE) \ 519 -a $(UIMAGE_LOADADDR) -e $(UIMAGE_ENTRYADDR) \ 520 -n '$(UIMAGE_NAME)' -d $< $@ 521 522# Flat Image Tree (FIT) 523# This allows for packaging of a kernel and all devicetrees files, using 524# compression. 525# --------------------------------------------------------------------------- 526 527MAKE_FIT := $(srctree)/scripts/make_fit.py 528 529# Use this to override the compression algorithm 530FIT_COMPRESSION ?= gzip 531 532quiet_cmd_fit = FIT $@ 533 cmd_fit = $(MAKE_FIT) -o $@ --arch $(UIMAGE_ARCH) --os linux \ 534 --name '$(UIMAGE_NAME)' \ 535 $(if $(findstring 1,$(KBUILD_VERBOSE)),-v) \ 536 $(if $(FIT_DECOMPOSE_DTBS),--decompose-dtbs) \ 537 --compress $(FIT_COMPRESSION) -k $< @$(word 2,$^) 538 539# XZ 540# --------------------------------------------------------------------------- 541# Use xzkern to compress the kernel image and xzmisc to compress other things. 542# 543# xzkern uses a big LZMA2 dictionary since it doesn't increase memory usage 544# of the kernel decompressor. A BCJ filter is used if it is available for 545# the target architecture. xzkern also appends uncompressed size of the data 546# using size_append. The .xz format has the size information available at 547# the end of the file too, but it's in more complex format and it's good to 548# avoid changing the part of the boot code that reads the uncompressed size. 549# Note that the bytes added by size_append will make the xz tool think that 550# the file is corrupt. This is expected. 551# 552# xzmisc doesn't use size_append, so it can be used to create normal .xz 553# files. xzmisc uses smaller LZMA2 dictionary than xzkern, because a very 554# big dictionary would increase the memory usage too much in the multi-call 555# decompression mode. A BCJ filter isn't used either. 556quiet_cmd_xzkern = XZKERN $@ 557 cmd_xzkern = cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh > $@ 558 559quiet_cmd_xzkern_with_size = XZKERN $@ 560 cmd_xzkern_with_size = { cat $(real-prereqs) | sh $(srctree)/scripts/xz_wrap.sh; \ 561 $(size_append); } > $@ 562 563quiet_cmd_xzmisc = XZMISC $@ 564 cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ 565 566# ZSTD 567# --------------------------------------------------------------------------- 568# Appends the uncompressed size of the data using size_append. The .zst 569# format has the size information available at the beginning of the file too, 570# but it's in a more complex format and it's good to avoid changing the part 571# of the boot code that reads the uncompressed size. 572# 573# Note that the bytes added by size_append will make the zstd tool think that 574# the file is corrupt. This is expected. 575# 576# zstd uses a maximum window size of 8 MB. zstd22 uses a maximum window size of 577# 128 MB. zstd22 is used for kernel compression because it is decompressed in a 578# single pass, so zstd doesn't need to allocate a window buffer. When streaming 579# decompression is used, like initramfs decompression, zstd22 should likely not 580# be used because it would require zstd to allocate a 128 MB buffer. 581 582quiet_cmd_zstd = ZSTD $@ 583 cmd_zstd = cat $(real-prereqs) | $(ZSTD) -19 > $@ 584 585quiet_cmd_zstd22 = ZSTD22 $@ 586 cmd_zstd22 = cat $(real-prereqs) | $(ZSTD) -22 --ultra > $@ 587 588quiet_cmd_zstd22_with_size = ZSTD22 $@ 589 cmd_zstd22_with_size = { cat $(real-prereqs) | $(ZSTD) -22 --ultra; $(size_append); } > $@ 590 591# ASM offsets 592# --------------------------------------------------------------------------- 593 594# Default sed regexp - multiline due to syntax constraints 595# 596# Use [:space:] because LLVM's integrated assembler inserts <tab> around 597# the .ascii directive whereas GCC keeps the <space> as-is. 598define sed-offsets 599 's:^[[:space:]]*\.ascii[[:space:]]*"\(.*\)".*:\1:; \ 600 /^->/{s:->#\(.*\):/* \1 */:; \ 601 s:^->\([^ ]*\) [\$$#]*\([^ ]*\) \(.*\):#define \1 \2 /* \3 */:; \ 602 s:->::; p;}' 603endef 604 605# Use filechk to avoid rebuilds when a header changes, but the resulting file 606# does not 607define filechk_offsets 608 echo "#ifndef $2"; \ 609 echo "#define $2"; \ 610 echo "/*"; \ 611 echo " * DO NOT MODIFY."; \ 612 echo " *"; \ 613 echo " * This file was generated by Kbuild"; \ 614 echo " */"; \ 615 echo ""; \ 616 sed -ne $(sed-offsets) < $<; \ 617 echo ""; \ 618 echo "#endif" 619endef 620